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-rw-r--r--net/rxrpc/Kconfig44
-rw-r--r--net/rxrpc/Makefile28
-rw-r--r--net/rxrpc/af_rxrpc.c898
-rw-r--r--net/rxrpc/ar-accept.c510
-rw-r--r--net/rxrpc/ar-ack.c1356
-rw-r--r--net/rxrpc/ar-call.c1019
-rw-r--r--net/rxrpc/ar-connection.c928
-rw-r--r--net/rxrpc/ar-connevent.c405
-rw-r--r--net/rxrpc/ar-error.c241
-rw-r--r--net/rxrpc/ar-input.c788
-rw-r--r--net/rxrpc/ar-internal.h812
-rw-r--r--net/rxrpc/ar-key.c1247
-rw-r--r--net/rxrpc/ar-local.c408
-rw-r--r--net/rxrpc/ar-output.c711
-rw-r--r--net/rxrpc/ar-peer.c303
-rw-r--r--net/rxrpc/ar-proc.c192
-rw-r--r--net/rxrpc/ar-recvmsg.c424
-rw-r--r--net/rxrpc/ar-security.c264
-rw-r--r--net/rxrpc/ar-skbuff.c137
-rw-r--r--net/rxrpc/ar-transport.c283
-rw-r--r--net/rxrpc/rxkad.c1161
-rw-r--r--net/rxrpc/sysctl.c146
22 files changed, 12305 insertions, 0 deletions
diff --git a/net/rxrpc/Kconfig b/net/rxrpc/Kconfig
new file mode 100644
index 000000000..23dcef12b
--- /dev/null
+++ b/net/rxrpc/Kconfig
@@ -0,0 +1,44 @@
+#
+# RxRPC session sockets
+#
+
+config AF_RXRPC
+ tristate "RxRPC session sockets"
+ depends on INET
+ select CRYPTO
+ select KEYS
+ help
+ Say Y or M here to include support for RxRPC session sockets (just
+ the transport part, not the presentation part: (un)marshalling is
+ left to the application).
+
+ These are used for AFS kernel filesystem and userspace utilities.
+
+ This module at the moment only supports client operations and is
+ currently incomplete.
+
+ See Documentation/networking/rxrpc.txt.
+
+
+config AF_RXRPC_DEBUG
+ bool "RxRPC dynamic debugging"
+ depends on AF_RXRPC
+ help
+ Say Y here to make runtime controllable debugging messages appear.
+
+ See Documentation/networking/rxrpc.txt.
+
+
+config RXKAD
+ tristate "RxRPC Kerberos security"
+ depends on AF_RXRPC
+ select CRYPTO
+ select CRYPTO_MANAGER
+ select CRYPTO_BLKCIPHER
+ select CRYPTO_PCBC
+ select CRYPTO_FCRYPT
+ help
+ Provide kerberos 4 and AFS kaserver security handling for AF_RXRPC
+ through the use of the key retention service.
+
+ See Documentation/networking/rxrpc.txt.
diff --git a/net/rxrpc/Makefile b/net/rxrpc/Makefile
new file mode 100644
index 000000000..ec126f912
--- /dev/null
+++ b/net/rxrpc/Makefile
@@ -0,0 +1,28 @@
+#
+# Makefile for Linux kernel RxRPC
+#
+
+af-rxrpc-y := \
+ af_rxrpc.o \
+ ar-accept.o \
+ ar-ack.o \
+ ar-call.o \
+ ar-connection.o \
+ ar-connevent.o \
+ ar-error.o \
+ ar-input.o \
+ ar-key.o \
+ ar-local.o \
+ ar-output.o \
+ ar-peer.o \
+ ar-recvmsg.o \
+ ar-security.o \
+ ar-skbuff.o \
+ ar-transport.o
+
+af-rxrpc-$(CONFIG_PROC_FS) += ar-proc.o
+af-rxrpc-$(CONFIG_SYSCTL) += sysctl.o
+
+obj-$(CONFIG_AF_RXRPC) += af-rxrpc.o
+
+obj-$(CONFIG_RXKAD) += rxkad.o
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
new file mode 100644
index 000000000..0095b9a0b
--- /dev/null
+++ b/net/rxrpc/af_rxrpc.c
@@ -0,0 +1,898 @@
+/* AF_RXRPC implementation
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/net.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <linux/key-type.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+MODULE_DESCRIPTION("RxRPC network protocol");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_RXRPC);
+
+unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
+module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(debug, "RxRPC debugging mask");
+
+static int sysctl_rxrpc_max_qlen __read_mostly = 10;
+
+static struct proto rxrpc_proto;
+static const struct proto_ops rxrpc_rpc_ops;
+
+/* local epoch for detecting local-end reset */
+__be32 rxrpc_epoch;
+
+/* current debugging ID */
+atomic_t rxrpc_debug_id;
+
+/* count of skbs currently in use */
+atomic_t rxrpc_n_skbs;
+
+struct workqueue_struct *rxrpc_workqueue;
+
+static void rxrpc_sock_destructor(struct sock *);
+
+/*
+ * see if an RxRPC socket is currently writable
+ */
+static inline int rxrpc_writable(struct sock *sk)
+{
+ return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
+}
+
+/*
+ * wait for write bufferage to become available
+ */
+static void rxrpc_write_space(struct sock *sk)
+{
+ _enter("%p", sk);
+ rcu_read_lock();
+ if (rxrpc_writable(sk)) {
+ struct socket_wq *wq = rcu_dereference(sk->sk_wq);
+
+ if (wq_has_sleeper(wq))
+ wake_up_interruptible(&wq->wait);
+ sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+ }
+ rcu_read_unlock();
+}
+
+/*
+ * validate an RxRPC address
+ */
+static int rxrpc_validate_address(struct rxrpc_sock *rx,
+ struct sockaddr_rxrpc *srx,
+ int len)
+{
+ if (len < sizeof(struct sockaddr_rxrpc))
+ return -EINVAL;
+
+ if (srx->srx_family != AF_RXRPC)
+ return -EAFNOSUPPORT;
+
+ if (srx->transport_type != SOCK_DGRAM)
+ return -ESOCKTNOSUPPORT;
+
+ len -= offsetof(struct sockaddr_rxrpc, transport);
+ if (srx->transport_len < sizeof(sa_family_t) ||
+ srx->transport_len > len)
+ return -EINVAL;
+
+ if (srx->transport.family != rx->proto)
+ return -EAFNOSUPPORT;
+
+ switch (srx->transport.family) {
+ case AF_INET:
+ _debug("INET: %x @ %pI4",
+ ntohs(srx->transport.sin.sin_port),
+ &srx->transport.sin.sin_addr);
+ if (srx->transport_len > 8)
+ memset((void *)&srx->transport + 8, 0,
+ srx->transport_len - 8);
+ break;
+
+ case AF_INET6:
+ default:
+ return -EAFNOSUPPORT;
+ }
+
+ return 0;
+}
+
+/*
+ * bind a local address to an RxRPC socket
+ */
+static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
+{
+ struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
+ struct sock *sk = sock->sk;
+ struct rxrpc_local *local;
+ struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
+ __be16 service_id;
+ int ret;
+
+ _enter("%p,%p,%d", rx, saddr, len);
+
+ ret = rxrpc_validate_address(rx, srx, len);
+ if (ret < 0)
+ goto error;
+
+ lock_sock(&rx->sk);
+
+ if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
+ ret = -EINVAL;
+ goto error_unlock;
+ }
+
+ memcpy(&rx->srx, srx, sizeof(rx->srx));
+
+ /* find a local transport endpoint if we don't have one already */
+ local = rxrpc_lookup_local(&rx->srx);
+ if (IS_ERR(local)) {
+ ret = PTR_ERR(local);
+ goto error_unlock;
+ }
+
+ rx->local = local;
+ if (srx->srx_service) {
+ service_id = htons(srx->srx_service);
+ write_lock_bh(&local->services_lock);
+ list_for_each_entry(prx, &local->services, listen_link) {
+ if (prx->service_id == service_id)
+ goto service_in_use;
+ }
+
+ rx->service_id = service_id;
+ list_add_tail(&rx->listen_link, &local->services);
+ write_unlock_bh(&local->services_lock);
+
+ rx->sk.sk_state = RXRPC_SERVER_BOUND;
+ } else {
+ rx->sk.sk_state = RXRPC_CLIENT_BOUND;
+ }
+
+ release_sock(&rx->sk);
+ _leave(" = 0");
+ return 0;
+
+service_in_use:
+ ret = -EADDRINUSE;
+ write_unlock_bh(&local->services_lock);
+error_unlock:
+ release_sock(&rx->sk);
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * set the number of pending calls permitted on a listening socket
+ */
+static int rxrpc_listen(struct socket *sock, int backlog)
+{
+ struct sock *sk = sock->sk;
+ struct rxrpc_sock *rx = rxrpc_sk(sk);
+ int ret;
+
+ _enter("%p,%d", rx, backlog);
+
+ lock_sock(&rx->sk);
+
+ switch (rx->sk.sk_state) {
+ case RXRPC_UNCONNECTED:
+ ret = -EADDRNOTAVAIL;
+ break;
+ case RXRPC_CLIENT_BOUND:
+ case RXRPC_CLIENT_CONNECTED:
+ default:
+ ret = -EBUSY;
+ break;
+ case RXRPC_SERVER_BOUND:
+ ASSERT(rx->local != NULL);
+ sk->sk_max_ack_backlog = backlog;
+ rx->sk.sk_state = RXRPC_SERVER_LISTENING;
+ ret = 0;
+ break;
+ }
+
+ release_sock(&rx->sk);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * find a transport by address
+ */
+static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
+ struct sockaddr *addr,
+ int addr_len, int flags,
+ gfp_t gfp)
+{
+ struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
+ struct rxrpc_transport *trans;
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+ struct rxrpc_peer *peer;
+
+ _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
+
+ ASSERT(rx->local != NULL);
+ ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
+
+ if (rx->srx.transport_type != srx->transport_type)
+ return ERR_PTR(-ESOCKTNOSUPPORT);
+ if (rx->srx.transport.family != srx->transport.family)
+ return ERR_PTR(-EAFNOSUPPORT);
+
+ /* find a remote transport endpoint from the local one */
+ peer = rxrpc_get_peer(srx, gfp);
+ if (IS_ERR(peer))
+ return ERR_CAST(peer);
+
+ /* find a transport */
+ trans = rxrpc_get_transport(rx->local, peer, gfp);
+ rxrpc_put_peer(peer);
+ _leave(" = %p", trans);
+ return trans;
+}
+
+/**
+ * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
+ * @sock: The socket on which to make the call
+ * @srx: The address of the peer to contact (defaults to socket setting)
+ * @key: The security context to use (defaults to socket setting)
+ * @user_call_ID: The ID to use
+ *
+ * Allow a kernel service to begin a call on the nominated socket. This just
+ * sets up all the internal tracking structures and allocates connection and
+ * call IDs as appropriate. The call to be used is returned.
+ *
+ * The default socket destination address and security may be overridden by
+ * supplying @srx and @key.
+ */
+struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
+ struct sockaddr_rxrpc *srx,
+ struct key *key,
+ unsigned long user_call_ID,
+ gfp_t gfp)
+{
+ struct rxrpc_conn_bundle *bundle;
+ struct rxrpc_transport *trans;
+ struct rxrpc_call *call;
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+ __be16 service_id;
+
+ _enter(",,%x,%lx", key_serial(key), user_call_ID);
+
+ lock_sock(&rx->sk);
+
+ if (srx) {
+ trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
+ sizeof(*srx), 0, gfp);
+ if (IS_ERR(trans)) {
+ call = ERR_CAST(trans);
+ trans = NULL;
+ goto out_notrans;
+ }
+ } else {
+ trans = rx->trans;
+ if (!trans) {
+ call = ERR_PTR(-ENOTCONN);
+ goto out_notrans;
+ }
+ atomic_inc(&trans->usage);
+ }
+
+ service_id = rx->service_id;
+ if (srx)
+ service_id = htons(srx->srx_service);
+
+ if (!key)
+ key = rx->key;
+ if (key && !key->payload.data)
+ key = NULL; /* a no-security key */
+
+ bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
+ if (IS_ERR(bundle)) {
+ call = ERR_CAST(bundle);
+ goto out;
+ }
+
+ call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
+ gfp);
+ rxrpc_put_bundle(trans, bundle);
+out:
+ rxrpc_put_transport(trans);
+out_notrans:
+ release_sock(&rx->sk);
+ _leave(" = %p", call);
+ return call;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_begin_call);
+
+/**
+ * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
+ * @call: The call to end
+ *
+ * Allow a kernel service to end a call it was using. The call must be
+ * complete before this is called (the call should be aborted if necessary).
+ */
+void rxrpc_kernel_end_call(struct rxrpc_call *call)
+{
+ _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
+ rxrpc_remove_user_ID(call->socket, call);
+ rxrpc_put_call(call);
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_end_call);
+
+/**
+ * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
+ * @sock: The socket to intercept received messages on
+ * @interceptor: The function to pass the messages to
+ *
+ * Allow a kernel service to intercept messages heading for the Rx queue on an
+ * RxRPC socket. They get passed to the specified function instead.
+ * @interceptor should free the socket buffers it is given. @interceptor is
+ * called with the socket receive queue spinlock held and softirqs disabled -
+ * this ensures that the messages will be delivered in the right order.
+ */
+void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
+ rxrpc_interceptor_t interceptor)
+{
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+
+ _enter("");
+ rx->interceptor = interceptor;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
+
+/*
+ * connect an RxRPC socket
+ * - this just targets it at a specific destination; no actual connection
+ * negotiation takes place
+ */
+static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
+ int addr_len, int flags)
+{
+ struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
+ struct sock *sk = sock->sk;
+ struct rxrpc_transport *trans;
+ struct rxrpc_local *local;
+ struct rxrpc_sock *rx = rxrpc_sk(sk);
+ int ret;
+
+ _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
+
+ ret = rxrpc_validate_address(rx, srx, addr_len);
+ if (ret < 0) {
+ _leave(" = %d [bad addr]", ret);
+ return ret;
+ }
+
+ lock_sock(&rx->sk);
+
+ switch (rx->sk.sk_state) {
+ case RXRPC_UNCONNECTED:
+ /* find a local transport endpoint if we don't have one already */
+ ASSERTCMP(rx->local, ==, NULL);
+ rx->srx.srx_family = AF_RXRPC;
+ rx->srx.srx_service = 0;
+ rx->srx.transport_type = srx->transport_type;
+ rx->srx.transport_len = sizeof(sa_family_t);
+ rx->srx.transport.family = srx->transport.family;
+ local = rxrpc_lookup_local(&rx->srx);
+ if (IS_ERR(local)) {
+ release_sock(&rx->sk);
+ return PTR_ERR(local);
+ }
+ rx->local = local;
+ rx->sk.sk_state = RXRPC_CLIENT_BOUND;
+ case RXRPC_CLIENT_BOUND:
+ break;
+ case RXRPC_CLIENT_CONNECTED:
+ release_sock(&rx->sk);
+ return -EISCONN;
+ default:
+ release_sock(&rx->sk);
+ return -EBUSY; /* server sockets can't connect as well */
+ }
+
+ trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
+ GFP_KERNEL);
+ if (IS_ERR(trans)) {
+ release_sock(&rx->sk);
+ _leave(" = %ld", PTR_ERR(trans));
+ return PTR_ERR(trans);
+ }
+
+ rx->trans = trans;
+ rx->service_id = htons(srx->srx_service);
+ rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
+
+ release_sock(&rx->sk);
+ return 0;
+}
+
+/*
+ * send a message through an RxRPC socket
+ * - in a client this does a number of things:
+ * - finds/sets up a connection for the security specified (if any)
+ * - initiates a call (ID in control data)
+ * - ends the request phase of a call (if MSG_MORE is not set)
+ * - sends a call data packet
+ * - may send an abort (abort code in control data)
+ */
+static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
+{
+ struct rxrpc_transport *trans;
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+ int ret;
+
+ _enter(",{%d},,%zu", rx->sk.sk_state, len);
+
+ if (m->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ if (m->msg_name) {
+ ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
+ if (ret < 0) {
+ _leave(" = %d [bad addr]", ret);
+ return ret;
+ }
+ }
+
+ trans = NULL;
+ lock_sock(&rx->sk);
+
+ if (m->msg_name) {
+ ret = -EISCONN;
+ trans = rxrpc_name_to_transport(sock, m->msg_name,
+ m->msg_namelen, 0, GFP_KERNEL);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ trans = NULL;
+ goto out;
+ }
+ } else {
+ trans = rx->trans;
+ if (trans)
+ atomic_inc(&trans->usage);
+ }
+
+ switch (rx->sk.sk_state) {
+ case RXRPC_SERVER_LISTENING:
+ if (!m->msg_name) {
+ ret = rxrpc_server_sendmsg(rx, m, len);
+ break;
+ }
+ case RXRPC_SERVER_BOUND:
+ case RXRPC_CLIENT_BOUND:
+ if (!m->msg_name) {
+ ret = -ENOTCONN;
+ break;
+ }
+ case RXRPC_CLIENT_CONNECTED:
+ ret = rxrpc_client_sendmsg(rx, trans, m, len);
+ break;
+ default:
+ ret = -ENOTCONN;
+ break;
+ }
+
+out:
+ release_sock(&rx->sk);
+ if (trans)
+ rxrpc_put_transport(trans);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * set RxRPC socket options
+ */
+static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+ unsigned int min_sec_level;
+ int ret;
+
+ _enter(",%d,%d,,%d", level, optname, optlen);
+
+ lock_sock(&rx->sk);
+ ret = -EOPNOTSUPP;
+
+ if (level == SOL_RXRPC) {
+ switch (optname) {
+ case RXRPC_EXCLUSIVE_CONNECTION:
+ ret = -EINVAL;
+ if (optlen != 0)
+ goto error;
+ ret = -EISCONN;
+ if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+ goto error;
+ set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
+ goto success;
+
+ case RXRPC_SECURITY_KEY:
+ ret = -EINVAL;
+ if (rx->key)
+ goto error;
+ ret = -EISCONN;
+ if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+ goto error;
+ ret = rxrpc_request_key(rx, optval, optlen);
+ goto error;
+
+ case RXRPC_SECURITY_KEYRING:
+ ret = -EINVAL;
+ if (rx->key)
+ goto error;
+ ret = -EISCONN;
+ if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+ goto error;
+ ret = rxrpc_server_keyring(rx, optval, optlen);
+ goto error;
+
+ case RXRPC_MIN_SECURITY_LEVEL:
+ ret = -EINVAL;
+ if (optlen != sizeof(unsigned int))
+ goto error;
+ ret = -EISCONN;
+ if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+ goto error;
+ ret = get_user(min_sec_level,
+ (unsigned int __user *) optval);
+ if (ret < 0)
+ goto error;
+ ret = -EINVAL;
+ if (min_sec_level > RXRPC_SECURITY_MAX)
+ goto error;
+ rx->min_sec_level = min_sec_level;
+ goto success;
+
+ default:
+ break;
+ }
+ }
+
+success:
+ ret = 0;
+error:
+ release_sock(&rx->sk);
+ return ret;
+}
+
+/*
+ * permit an RxRPC socket to be polled
+ */
+static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
+ poll_table *wait)
+{
+ unsigned int mask;
+ struct sock *sk = sock->sk;
+
+ sock_poll_wait(file, sk_sleep(sk), wait);
+ mask = 0;
+
+ /* the socket is readable if there are any messages waiting on the Rx
+ * queue */
+ if (!skb_queue_empty(&sk->sk_receive_queue))
+ mask |= POLLIN | POLLRDNORM;
+
+ /* the socket is writable if there is space to add new data to the
+ * socket; there is no guarantee that any particular call in progress
+ * on the socket may have space in the Tx ACK window */
+ if (rxrpc_writable(sk))
+ mask |= POLLOUT | POLLWRNORM;
+
+ return mask;
+}
+
+/*
+ * create an RxRPC socket
+ */
+static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct rxrpc_sock *rx;
+ struct sock *sk;
+
+ _enter("%p,%d", sock, protocol);
+
+ if (!net_eq(net, &init_net))
+ return -EAFNOSUPPORT;
+
+ /* we support transport protocol UDP only */
+ if (protocol != PF_INET)
+ return -EPROTONOSUPPORT;
+
+ if (sock->type != SOCK_DGRAM)
+ return -ESOCKTNOSUPPORT;
+
+ sock->ops = &rxrpc_rpc_ops;
+ sock->state = SS_UNCONNECTED;
+
+ sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
+ if (!sk)
+ return -ENOMEM;
+
+ sock_init_data(sock, sk);
+ sk->sk_state = RXRPC_UNCONNECTED;
+ sk->sk_write_space = rxrpc_write_space;
+ sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen;
+ sk->sk_destruct = rxrpc_sock_destructor;
+
+ rx = rxrpc_sk(sk);
+ rx->proto = protocol;
+ rx->calls = RB_ROOT;
+
+ INIT_LIST_HEAD(&rx->listen_link);
+ INIT_LIST_HEAD(&rx->secureq);
+ INIT_LIST_HEAD(&rx->acceptq);
+ rwlock_init(&rx->call_lock);
+ memset(&rx->srx, 0, sizeof(rx->srx));
+
+ _leave(" = 0 [%p]", rx);
+ return 0;
+}
+
+/*
+ * RxRPC socket destructor
+ */
+static void rxrpc_sock_destructor(struct sock *sk)
+{
+ _enter("%p", sk);
+
+ rxrpc_purge_queue(&sk->sk_receive_queue);
+
+ WARN_ON(atomic_read(&sk->sk_wmem_alloc));
+ WARN_ON(!sk_unhashed(sk));
+ WARN_ON(sk->sk_socket);
+
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ printk("Attempt to release alive rxrpc socket: %p\n", sk);
+ return;
+ }
+}
+
+/*
+ * release an RxRPC socket
+ */
+static int rxrpc_release_sock(struct sock *sk)
+{
+ struct rxrpc_sock *rx = rxrpc_sk(sk);
+
+ _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
+
+ /* declare the socket closed for business */
+ sock_orphan(sk);
+ sk->sk_shutdown = SHUTDOWN_MASK;
+
+ spin_lock_bh(&sk->sk_receive_queue.lock);
+ sk->sk_state = RXRPC_CLOSE;
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+
+ ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
+
+ if (!list_empty(&rx->listen_link)) {
+ write_lock_bh(&rx->local->services_lock);
+ list_del(&rx->listen_link);
+ write_unlock_bh(&rx->local->services_lock);
+ }
+
+ /* try to flush out this socket */
+ rxrpc_release_calls_on_socket(rx);
+ flush_workqueue(rxrpc_workqueue);
+ rxrpc_purge_queue(&sk->sk_receive_queue);
+
+ if (rx->conn) {
+ rxrpc_put_connection(rx->conn);
+ rx->conn = NULL;
+ }
+
+ if (rx->bundle) {
+ rxrpc_put_bundle(rx->trans, rx->bundle);
+ rx->bundle = NULL;
+ }
+ if (rx->trans) {
+ rxrpc_put_transport(rx->trans);
+ rx->trans = NULL;
+ }
+ if (rx->local) {
+ rxrpc_put_local(rx->local);
+ rx->local = NULL;
+ }
+
+ key_put(rx->key);
+ rx->key = NULL;
+ key_put(rx->securities);
+ rx->securities = NULL;
+ sock_put(sk);
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * release an RxRPC BSD socket on close() or equivalent
+ */
+static int rxrpc_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ _enter("%p{%p}", sock, sk);
+
+ if (!sk)
+ return 0;
+
+ sock->sk = NULL;
+
+ return rxrpc_release_sock(sk);
+}
+
+/*
+ * RxRPC network protocol
+ */
+static const struct proto_ops rxrpc_rpc_ops = {
+ .family = PF_UNIX,
+ .owner = THIS_MODULE,
+ .release = rxrpc_release,
+ .bind = rxrpc_bind,
+ .connect = rxrpc_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = sock_no_getname,
+ .poll = rxrpc_poll,
+ .ioctl = sock_no_ioctl,
+ .listen = rxrpc_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = rxrpc_setsockopt,
+ .getsockopt = sock_no_getsockopt,
+ .sendmsg = rxrpc_sendmsg,
+ .recvmsg = rxrpc_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
+static struct proto rxrpc_proto = {
+ .name = "RXRPC",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct rxrpc_sock),
+ .max_header = sizeof(struct rxrpc_header),
+};
+
+static const struct net_proto_family rxrpc_family_ops = {
+ .family = PF_RXRPC,
+ .create = rxrpc_create,
+ .owner = THIS_MODULE,
+};
+
+/*
+ * initialise and register the RxRPC protocol
+ */
+static int __init af_rxrpc_init(void)
+{
+ int ret = -1;
+
+ BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
+
+ rxrpc_epoch = htonl(get_seconds());
+
+ ret = -ENOMEM;
+ rxrpc_call_jar = kmem_cache_create(
+ "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!rxrpc_call_jar) {
+ printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
+ goto error_call_jar;
+ }
+
+ rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
+ if (!rxrpc_workqueue) {
+ printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
+ goto error_work_queue;
+ }
+
+ ret = proto_register(&rxrpc_proto, 1);
+ if (ret < 0) {
+ printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
+ goto error_proto;
+ }
+
+ ret = sock_register(&rxrpc_family_ops);
+ if (ret < 0) {
+ printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
+ goto error_sock;
+ }
+
+ ret = register_key_type(&key_type_rxrpc);
+ if (ret < 0) {
+ printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
+ goto error_key_type;
+ }
+
+ ret = register_key_type(&key_type_rxrpc_s);
+ if (ret < 0) {
+ printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
+ goto error_key_type_s;
+ }
+
+ ret = rxrpc_sysctl_init();
+ if (ret < 0) {
+ printk(KERN_CRIT "RxRPC: Cannot register sysctls\n");
+ goto error_sysctls;
+ }
+
+#ifdef CONFIG_PROC_FS
+ proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
+ proc_create("rxrpc_conns", 0, init_net.proc_net,
+ &rxrpc_connection_seq_fops);
+#endif
+ return 0;
+
+error_sysctls:
+ unregister_key_type(&key_type_rxrpc_s);
+error_key_type_s:
+ unregister_key_type(&key_type_rxrpc);
+error_key_type:
+ sock_unregister(PF_RXRPC);
+error_sock:
+ proto_unregister(&rxrpc_proto);
+error_proto:
+ destroy_workqueue(rxrpc_workqueue);
+error_work_queue:
+ kmem_cache_destroy(rxrpc_call_jar);
+error_call_jar:
+ return ret;
+}
+
+/*
+ * unregister the RxRPC protocol
+ */
+static void __exit af_rxrpc_exit(void)
+{
+ _enter("");
+ rxrpc_sysctl_exit();
+ unregister_key_type(&key_type_rxrpc_s);
+ unregister_key_type(&key_type_rxrpc);
+ sock_unregister(PF_RXRPC);
+ proto_unregister(&rxrpc_proto);
+ rxrpc_destroy_all_calls();
+ rxrpc_destroy_all_connections();
+ rxrpc_destroy_all_transports();
+ rxrpc_destroy_all_peers();
+ rxrpc_destroy_all_locals();
+
+ ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
+
+ _debug("flush scheduled work");
+ flush_workqueue(rxrpc_workqueue);
+ remove_proc_entry("rxrpc_conns", init_net.proc_net);
+ remove_proc_entry("rxrpc_calls", init_net.proc_net);
+ destroy_workqueue(rxrpc_workqueue);
+ kmem_cache_destroy(rxrpc_call_jar);
+ _leave("");
+}
+
+module_init(af_rxrpc_init);
+module_exit(af_rxrpc_exit);
diff --git a/net/rxrpc/ar-accept.c b/net/rxrpc/ar-accept.c
new file mode 100644
index 000000000..6d79310fc
--- /dev/null
+++ b/net/rxrpc/ar-accept.c
@@ -0,0 +1,510 @@
+/* incoming call handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <linux/gfp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * generate a connection-level abort
+ */
+static int rxrpc_busy(struct rxrpc_local *local, struct sockaddr_rxrpc *srx,
+ struct rxrpc_header *hdr)
+{
+ struct msghdr msg;
+ struct kvec iov[1];
+ size_t len;
+ int ret;
+
+ _enter("%d,,", local->debug_id);
+
+ msg.msg_name = &srx->transport.sin;
+ msg.msg_namelen = sizeof(srx->transport.sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ hdr->seq = 0;
+ hdr->type = RXRPC_PACKET_TYPE_BUSY;
+ hdr->flags = 0;
+ hdr->userStatus = 0;
+ hdr->_rsvd = 0;
+
+ iov[0].iov_base = hdr;
+ iov[0].iov_len = sizeof(*hdr);
+
+ len = iov[0].iov_len;
+
+ hdr->serial = htonl(1);
+ _proto("Tx BUSY %%%u", ntohl(hdr->serial));
+
+ ret = kernel_sendmsg(local->socket, &msg, iov, 1, len);
+ if (ret < 0) {
+ _leave(" = -EAGAIN [sendmsg failed: %d]", ret);
+ return -EAGAIN;
+ }
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * accept an incoming call that needs peer, transport and/or connection setting
+ * up
+ */
+static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
+ struct rxrpc_sock *rx,
+ struct sk_buff *skb,
+ struct sockaddr_rxrpc *srx)
+{
+ struct rxrpc_connection *conn;
+ struct rxrpc_transport *trans;
+ struct rxrpc_skb_priv *sp, *nsp;
+ struct rxrpc_peer *peer;
+ struct rxrpc_call *call;
+ struct sk_buff *notification;
+ int ret;
+
+ _enter("");
+
+ sp = rxrpc_skb(skb);
+
+ /* get a notification message to send to the server app */
+ notification = alloc_skb(0, GFP_NOFS);
+ if (!notification) {
+ _debug("no memory");
+ ret = -ENOMEM;
+ goto error_nofree;
+ }
+ rxrpc_new_skb(notification);
+ notification->mark = RXRPC_SKB_MARK_NEW_CALL;
+
+ peer = rxrpc_get_peer(srx, GFP_NOIO);
+ if (IS_ERR(peer)) {
+ _debug("no peer");
+ ret = -EBUSY;
+ goto error;
+ }
+
+ trans = rxrpc_get_transport(local, peer, GFP_NOIO);
+ rxrpc_put_peer(peer);
+ if (IS_ERR(trans)) {
+ _debug("no trans");
+ ret = -EBUSY;
+ goto error;
+ }
+
+ conn = rxrpc_incoming_connection(trans, &sp->hdr, GFP_NOIO);
+ rxrpc_put_transport(trans);
+ if (IS_ERR(conn)) {
+ _debug("no conn");
+ ret = PTR_ERR(conn);
+ goto error;
+ }
+
+ call = rxrpc_incoming_call(rx, conn, &sp->hdr, GFP_NOIO);
+ rxrpc_put_connection(conn);
+ if (IS_ERR(call)) {
+ _debug("no call");
+ ret = PTR_ERR(call);
+ goto error;
+ }
+
+ /* attach the call to the socket */
+ read_lock_bh(&local->services_lock);
+ if (rx->sk.sk_state == RXRPC_CLOSE)
+ goto invalid_service;
+
+ write_lock(&rx->call_lock);
+ if (!test_and_set_bit(RXRPC_CALL_INIT_ACCEPT, &call->flags)) {
+ rxrpc_get_call(call);
+
+ spin_lock(&call->conn->state_lock);
+ if (sp->hdr.securityIndex > 0 &&
+ call->conn->state == RXRPC_CONN_SERVER_UNSECURED) {
+ _debug("await conn sec");
+ list_add_tail(&call->accept_link, &rx->secureq);
+ call->conn->state = RXRPC_CONN_SERVER_CHALLENGING;
+ atomic_inc(&call->conn->usage);
+ set_bit(RXRPC_CONN_CHALLENGE, &call->conn->events);
+ rxrpc_queue_conn(call->conn);
+ } else {
+ _debug("conn ready");
+ call->state = RXRPC_CALL_SERVER_ACCEPTING;
+ list_add_tail(&call->accept_link, &rx->acceptq);
+ rxrpc_get_call(call);
+ nsp = rxrpc_skb(notification);
+ nsp->call = call;
+
+ ASSERTCMP(atomic_read(&call->usage), >=, 3);
+
+ _debug("notify");
+ spin_lock(&call->lock);
+ ret = rxrpc_queue_rcv_skb(call, notification, true,
+ false);
+ spin_unlock(&call->lock);
+ notification = NULL;
+ BUG_ON(ret < 0);
+ }
+ spin_unlock(&call->conn->state_lock);
+
+ _debug("queued");
+ }
+ write_unlock(&rx->call_lock);
+
+ _debug("process");
+ rxrpc_fast_process_packet(call, skb);
+
+ _debug("done");
+ read_unlock_bh(&local->services_lock);
+ rxrpc_free_skb(notification);
+ rxrpc_put_call(call);
+ _leave(" = 0");
+ return 0;
+
+invalid_service:
+ _debug("invalid");
+ read_unlock_bh(&local->services_lock);
+
+ read_lock_bh(&call->state_lock);
+ if (!test_bit(RXRPC_CALL_RELEASE, &call->flags) &&
+ !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) {
+ rxrpc_get_call(call);
+ rxrpc_queue_call(call);
+ }
+ read_unlock_bh(&call->state_lock);
+ rxrpc_put_call(call);
+ ret = -ECONNREFUSED;
+error:
+ rxrpc_free_skb(notification);
+error_nofree:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * accept incoming calls that need peer, transport and/or connection setting up
+ * - the packets we get are all incoming client DATA packets that have seq == 1
+ */
+void rxrpc_accept_incoming_calls(struct work_struct *work)
+{
+ struct rxrpc_local *local =
+ container_of(work, struct rxrpc_local, acceptor);
+ struct rxrpc_skb_priv *sp;
+ struct sockaddr_rxrpc srx;
+ struct rxrpc_sock *rx;
+ struct sk_buff *skb;
+ __be16 service_id;
+ int ret;
+
+ _enter("%d", local->debug_id);
+
+ read_lock_bh(&rxrpc_local_lock);
+ if (atomic_read(&local->usage) > 0)
+ rxrpc_get_local(local);
+ else
+ local = NULL;
+ read_unlock_bh(&rxrpc_local_lock);
+ if (!local) {
+ _leave(" [local dead]");
+ return;
+ }
+
+process_next_packet:
+ skb = skb_dequeue(&local->accept_queue);
+ if (!skb) {
+ rxrpc_put_local(local);
+ _leave("\n");
+ return;
+ }
+
+ _net("incoming call skb %p", skb);
+
+ sp = rxrpc_skb(skb);
+
+ /* determine the remote address */
+ memset(&srx, 0, sizeof(srx));
+ srx.srx_family = AF_RXRPC;
+ srx.transport.family = local->srx.transport.family;
+ srx.transport_type = local->srx.transport_type;
+ switch (srx.transport.family) {
+ case AF_INET:
+ srx.transport_len = sizeof(struct sockaddr_in);
+ srx.transport.sin.sin_port = udp_hdr(skb)->source;
+ srx.transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+ break;
+ default:
+ goto busy;
+ }
+
+ /* get the socket providing the service */
+ service_id = sp->hdr.serviceId;
+ read_lock_bh(&local->services_lock);
+ list_for_each_entry(rx, &local->services, listen_link) {
+ if (rx->service_id == service_id &&
+ rx->sk.sk_state != RXRPC_CLOSE)
+ goto found_service;
+ }
+ read_unlock_bh(&local->services_lock);
+ goto invalid_service;
+
+found_service:
+ _debug("found service %hd", ntohs(rx->service_id));
+ if (sk_acceptq_is_full(&rx->sk))
+ goto backlog_full;
+ sk_acceptq_added(&rx->sk);
+ sock_hold(&rx->sk);
+ read_unlock_bh(&local->services_lock);
+
+ ret = rxrpc_accept_incoming_call(local, rx, skb, &srx);
+ if (ret < 0)
+ sk_acceptq_removed(&rx->sk);
+ sock_put(&rx->sk);
+ switch (ret) {
+ case -ECONNRESET: /* old calls are ignored */
+ case -ECONNABORTED: /* aborted calls are reaborted or ignored */
+ case 0:
+ goto process_next_packet;
+ case -ECONNREFUSED:
+ goto invalid_service;
+ case -EBUSY:
+ goto busy;
+ case -EKEYREJECTED:
+ goto security_mismatch;
+ default:
+ BUG();
+ }
+
+backlog_full:
+ read_unlock_bh(&local->services_lock);
+busy:
+ rxrpc_busy(local, &srx, &sp->hdr);
+ rxrpc_free_skb(skb);
+ goto process_next_packet;
+
+invalid_service:
+ skb->priority = RX_INVALID_OPERATION;
+ rxrpc_reject_packet(local, skb);
+ goto process_next_packet;
+
+ /* can't change connection security type mid-flow */
+security_mismatch:
+ skb->priority = RX_PROTOCOL_ERROR;
+ rxrpc_reject_packet(local, skb);
+ goto process_next_packet;
+}
+
+/*
+ * handle acceptance of a call by userspace
+ * - assign the user call ID to the call at the front of the queue
+ */
+struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *rx,
+ unsigned long user_call_ID)
+{
+ struct rxrpc_call *call;
+ struct rb_node *parent, **pp;
+ int ret;
+
+ _enter(",%lx", user_call_ID);
+
+ ASSERT(!irqs_disabled());
+
+ write_lock(&rx->call_lock);
+
+ ret = -ENODATA;
+ if (list_empty(&rx->acceptq))
+ goto out;
+
+ /* check the user ID isn't already in use */
+ ret = -EBADSLT;
+ pp = &rx->calls.rb_node;
+ parent = NULL;
+ while (*pp) {
+ parent = *pp;
+ call = rb_entry(parent, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ pp = &(*pp)->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ pp = &(*pp)->rb_right;
+ else
+ goto out;
+ }
+
+ /* dequeue the first call and check it's still valid */
+ call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);
+ list_del_init(&call->accept_link);
+ sk_acceptq_removed(&rx->sk);
+
+ write_lock_bh(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_SERVER_ACCEPTING:
+ call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
+ break;
+ case RXRPC_CALL_REMOTELY_ABORTED:
+ case RXRPC_CALL_LOCALLY_ABORTED:
+ ret = -ECONNABORTED;
+ goto out_release;
+ case RXRPC_CALL_NETWORK_ERROR:
+ ret = call->conn->error;
+ goto out_release;
+ case RXRPC_CALL_DEAD:
+ ret = -ETIME;
+ goto out_discard;
+ default:
+ BUG();
+ }
+
+ /* formalise the acceptance */
+ call->user_call_ID = user_call_ID;
+ rb_link_node(&call->sock_node, parent, pp);
+ rb_insert_color(&call->sock_node, &rx->calls);
+ if (test_and_set_bit(RXRPC_CALL_HAS_USERID, &call->flags))
+ BUG();
+ if (test_and_set_bit(RXRPC_CALL_ACCEPTED, &call->events))
+ BUG();
+ rxrpc_queue_call(call);
+
+ rxrpc_get_call(call);
+ write_unlock_bh(&call->state_lock);
+ write_unlock(&rx->call_lock);
+ _leave(" = %p{%d}", call, call->debug_id);
+ return call;
+
+ /* if the call is already dying or dead, then we leave the socket's ref
+ * on it to be released by rxrpc_dead_call_expired() as induced by
+ * rxrpc_release_call() */
+out_release:
+ _debug("release %p", call);
+ if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+ !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+ rxrpc_queue_call(call);
+out_discard:
+ write_unlock_bh(&call->state_lock);
+ _debug("discard %p", call);
+out:
+ write_unlock(&rx->call_lock);
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+}
+
+/*
+ * handle rejectance of a call by userspace
+ * - reject the call at the front of the queue
+ */
+int rxrpc_reject_call(struct rxrpc_sock *rx)
+{
+ struct rxrpc_call *call;
+ int ret;
+
+ _enter("");
+
+ ASSERT(!irqs_disabled());
+
+ write_lock(&rx->call_lock);
+
+ ret = -ENODATA;
+ if (list_empty(&rx->acceptq))
+ goto out;
+
+ /* dequeue the first call and check it's still valid */
+ call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);
+ list_del_init(&call->accept_link);
+ sk_acceptq_removed(&rx->sk);
+
+ write_lock_bh(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_SERVER_ACCEPTING:
+ call->state = RXRPC_CALL_SERVER_BUSY;
+ if (test_and_set_bit(RXRPC_CALL_REJECT_BUSY, &call->events))
+ rxrpc_queue_call(call);
+ ret = 0;
+ goto out_release;
+ case RXRPC_CALL_REMOTELY_ABORTED:
+ case RXRPC_CALL_LOCALLY_ABORTED:
+ ret = -ECONNABORTED;
+ goto out_release;
+ case RXRPC_CALL_NETWORK_ERROR:
+ ret = call->conn->error;
+ goto out_release;
+ case RXRPC_CALL_DEAD:
+ ret = -ETIME;
+ goto out_discard;
+ default:
+ BUG();
+ }
+
+ /* if the call is already dying or dead, then we leave the socket's ref
+ * on it to be released by rxrpc_dead_call_expired() as induced by
+ * rxrpc_release_call() */
+out_release:
+ _debug("release %p", call);
+ if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+ !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+ rxrpc_queue_call(call);
+out_discard:
+ write_unlock_bh(&call->state_lock);
+ _debug("discard %p", call);
+out:
+ write_unlock(&rx->call_lock);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/**
+ * rxrpc_kernel_accept_call - Allow a kernel service to accept an incoming call
+ * @sock: The socket on which the impending call is waiting
+ * @user_call_ID: The tag to attach to the call
+ *
+ * Allow a kernel service to accept an incoming call, assuming the incoming
+ * call is still valid.
+ */
+struct rxrpc_call *rxrpc_kernel_accept_call(struct socket *sock,
+ unsigned long user_call_ID)
+{
+ struct rxrpc_call *call;
+
+ _enter(",%lx", user_call_ID);
+ call = rxrpc_accept_call(rxrpc_sk(sock->sk), user_call_ID);
+ _leave(" = %p", call);
+ return call;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_accept_call);
+
+/**
+ * rxrpc_kernel_reject_call - Allow a kernel service to reject an incoming call
+ * @sock: The socket on which the impending call is waiting
+ *
+ * Allow a kernel service to reject an incoming call with a BUSY message,
+ * assuming the incoming call is still valid.
+ */
+int rxrpc_kernel_reject_call(struct socket *sock)
+{
+ int ret;
+
+ _enter("");
+ ret = rxrpc_reject_call(rxrpc_sk(sock->sk));
+ _leave(" = %d", ret);
+ return ret;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_reject_call);
diff --git a/net/rxrpc/ar-ack.c b/net/rxrpc/ar-ack.c
new file mode 100644
index 000000000..e0547f521
--- /dev/null
+++ b/net/rxrpc/ar-ack.c
@@ -0,0 +1,1356 @@
+/* Management of Tx window, Tx resend, ACKs and out-of-sequence reception
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/circ_buf.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/udp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * How long to wait before scheduling ACK generation after seeing a
+ * packet with RXRPC_REQUEST_ACK set (in jiffies).
+ */
+unsigned rxrpc_requested_ack_delay = 1;
+
+/*
+ * How long to wait before scheduling an ACK with subtype DELAY (in jiffies).
+ *
+ * We use this when we've received new data packets. If those packets aren't
+ * all consumed within this time we will send a DELAY ACK if an ACK was not
+ * requested to let the sender know it doesn't need to resend.
+ */
+unsigned rxrpc_soft_ack_delay = 1 * HZ;
+
+/*
+ * How long to wait before scheduling an ACK with subtype IDLE (in jiffies).
+ *
+ * We use this when we've consumed some previously soft-ACK'd packets when
+ * further packets aren't immediately received to decide when to send an IDLE
+ * ACK let the other end know that it can free up its Tx buffer space.
+ */
+unsigned rxrpc_idle_ack_delay = 0.5 * HZ;
+
+/*
+ * Receive window size in packets. This indicates the maximum number of
+ * unconsumed received packets we're willing to retain in memory. Once this
+ * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further
+ * packets.
+ */
+unsigned rxrpc_rx_window_size = 32;
+
+/*
+ * Maximum Rx MTU size. This indicates to the sender the size of jumbo packet
+ * made by gluing normal packets together that we're willing to handle.
+ */
+unsigned rxrpc_rx_mtu = 5692;
+
+/*
+ * The maximum number of fragments in a received jumbo packet that we tell the
+ * sender that we're willing to handle.
+ */
+unsigned rxrpc_rx_jumbo_max = 4;
+
+static const char *rxrpc_acks(u8 reason)
+{
+ static const char *const str[] = {
+ "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY",
+ "IDL", "-?-"
+ };
+
+ if (reason >= ARRAY_SIZE(str))
+ reason = ARRAY_SIZE(str) - 1;
+ return str[reason];
+}
+
+static const s8 rxrpc_ack_priority[] = {
+ [0] = 0,
+ [RXRPC_ACK_DELAY] = 1,
+ [RXRPC_ACK_REQUESTED] = 2,
+ [RXRPC_ACK_IDLE] = 3,
+ [RXRPC_ACK_PING_RESPONSE] = 4,
+ [RXRPC_ACK_DUPLICATE] = 5,
+ [RXRPC_ACK_OUT_OF_SEQUENCE] = 6,
+ [RXRPC_ACK_EXCEEDS_WINDOW] = 7,
+ [RXRPC_ACK_NOSPACE] = 8,
+};
+
+/*
+ * propose an ACK be sent
+ */
+void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
+ __be32 serial, bool immediate)
+{
+ unsigned long expiry;
+ s8 prior = rxrpc_ack_priority[ack_reason];
+
+ ASSERTCMP(prior, >, 0);
+
+ _enter("{%d},%s,%%%x,%u",
+ call->debug_id, rxrpc_acks(ack_reason), ntohl(serial),
+ immediate);
+
+ if (prior < rxrpc_ack_priority[call->ackr_reason]) {
+ if (immediate)
+ goto cancel_timer;
+ return;
+ }
+
+ /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial
+ * numbers */
+ if (prior == rxrpc_ack_priority[call->ackr_reason]) {
+ if (prior <= 4)
+ call->ackr_serial = serial;
+ if (immediate)
+ goto cancel_timer;
+ return;
+ }
+
+ call->ackr_reason = ack_reason;
+ call->ackr_serial = serial;
+
+ switch (ack_reason) {
+ case RXRPC_ACK_DELAY:
+ _debug("run delay timer");
+ expiry = rxrpc_soft_ack_delay;
+ goto run_timer;
+
+ case RXRPC_ACK_IDLE:
+ if (!immediate) {
+ _debug("run defer timer");
+ expiry = rxrpc_idle_ack_delay;
+ goto run_timer;
+ }
+ goto cancel_timer;
+
+ case RXRPC_ACK_REQUESTED:
+ expiry = rxrpc_requested_ack_delay;
+ if (!expiry)
+ goto cancel_timer;
+ if (!immediate || serial == cpu_to_be32(1)) {
+ _debug("run defer timer");
+ goto run_timer;
+ }
+
+ default:
+ _debug("immediate ACK");
+ goto cancel_timer;
+ }
+
+run_timer:
+ expiry += jiffies;
+ if (!timer_pending(&call->ack_timer) ||
+ time_after(call->ack_timer.expires, expiry))
+ mod_timer(&call->ack_timer, expiry);
+ return;
+
+cancel_timer:
+ _debug("cancel timer %%%u", ntohl(serial));
+ try_to_del_timer_sync(&call->ack_timer);
+ read_lock_bh(&call->state_lock);
+ if (call->state <= RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_ACK, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * propose an ACK be sent, locking the call structure
+ */
+void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason,
+ __be32 serial, bool immediate)
+{
+ s8 prior = rxrpc_ack_priority[ack_reason];
+
+ if (prior > rxrpc_ack_priority[call->ackr_reason]) {
+ spin_lock_bh(&call->lock);
+ __rxrpc_propose_ACK(call, ack_reason, serial, immediate);
+ spin_unlock_bh(&call->lock);
+ }
+}
+
+/*
+ * set the resend timer
+ */
+static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend,
+ unsigned long resend_at)
+{
+ read_lock_bh(&call->state_lock);
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ resend = 0;
+
+ if (resend & 1) {
+ _debug("SET RESEND");
+ set_bit(RXRPC_CALL_RESEND, &call->events);
+ }
+
+ if (resend & 2) {
+ _debug("MODIFY RESEND TIMER");
+ set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ mod_timer(&call->resend_timer, resend_at);
+ } else {
+ _debug("KILL RESEND TIMER");
+ del_timer_sync(&call->resend_timer);
+ clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ }
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * resend packets
+ */
+static void rxrpc_resend(struct rxrpc_call *call)
+{
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_header *hdr;
+ struct sk_buff *txb;
+ unsigned long *p_txb, resend_at;
+ bool stop;
+ int loop;
+ u8 resend;
+
+ _enter("{%d,%d,%d,%d},",
+ call->acks_hard, call->acks_unacked,
+ atomic_read(&call->sequence),
+ CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
+
+ stop = false;
+ resend = 0;
+ resend_at = 0;
+
+ for (loop = call->acks_tail;
+ loop != call->acks_head || stop;
+ loop = (loop + 1) & (call->acks_winsz - 1)
+ ) {
+ p_txb = call->acks_window + loop;
+ smp_read_barrier_depends();
+ if (*p_txb & 1)
+ continue;
+
+ txb = (struct sk_buff *) *p_txb;
+ sp = rxrpc_skb(txb);
+
+ if (sp->need_resend) {
+ sp->need_resend = false;
+
+ /* each Tx packet has a new serial number */
+ sp->hdr.serial =
+ htonl(atomic_inc_return(&call->conn->serial));
+
+ hdr = (struct rxrpc_header *) txb->head;
+ hdr->serial = sp->hdr.serial;
+
+ _proto("Tx DATA %%%u { #%d }",
+ ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
+ if (rxrpc_send_packet(call->conn->trans, txb) < 0) {
+ stop = true;
+ sp->resend_at = jiffies + 3;
+ } else {
+ sp->resend_at =
+ jiffies + rxrpc_resend_timeout;
+ }
+ }
+
+ if (time_after_eq(jiffies + 1, sp->resend_at)) {
+ sp->need_resend = true;
+ resend |= 1;
+ } else if (resend & 2) {
+ if (time_before(sp->resend_at, resend_at))
+ resend_at = sp->resend_at;
+ } else {
+ resend_at = sp->resend_at;
+ resend |= 2;
+ }
+ }
+
+ rxrpc_set_resend(call, resend, resend_at);
+ _leave("");
+}
+
+/*
+ * handle resend timer expiry
+ */
+static void rxrpc_resend_timer(struct rxrpc_call *call)
+{
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *txb;
+ unsigned long *p_txb, resend_at;
+ int loop;
+ u8 resend;
+
+ _enter("%d,%d,%d",
+ call->acks_tail, call->acks_unacked, call->acks_head);
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ resend = 0;
+ resend_at = 0;
+
+ for (loop = call->acks_unacked;
+ loop != call->acks_head;
+ loop = (loop + 1) & (call->acks_winsz - 1)
+ ) {
+ p_txb = call->acks_window + loop;
+ smp_read_barrier_depends();
+ txb = (struct sk_buff *) (*p_txb & ~1);
+ sp = rxrpc_skb(txb);
+
+ ASSERT(!(*p_txb & 1));
+
+ if (sp->need_resend) {
+ ;
+ } else if (time_after_eq(jiffies + 1, sp->resend_at)) {
+ sp->need_resend = true;
+ resend |= 1;
+ } else if (resend & 2) {
+ if (time_before(sp->resend_at, resend_at))
+ resend_at = sp->resend_at;
+ } else {
+ resend_at = sp->resend_at;
+ resend |= 2;
+ }
+ }
+
+ rxrpc_set_resend(call, resend, resend_at);
+ _leave("");
+}
+
+/*
+ * process soft ACKs of our transmitted packets
+ * - these indicate packets the peer has or has not received, but hasn't yet
+ * given to the consumer, and so can still be discarded and re-requested
+ */
+static int rxrpc_process_soft_ACKs(struct rxrpc_call *call,
+ struct rxrpc_ackpacket *ack,
+ struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *txb;
+ unsigned long *p_txb, resend_at;
+ int loop;
+ u8 sacks[RXRPC_MAXACKS], resend;
+
+ _enter("{%d,%d},{%d},",
+ call->acks_hard,
+ CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz),
+ ack->nAcks);
+
+ if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0)
+ goto protocol_error;
+
+ resend = 0;
+ resend_at = 0;
+ for (loop = 0; loop < ack->nAcks; loop++) {
+ p_txb = call->acks_window;
+ p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1);
+ smp_read_barrier_depends();
+ txb = (struct sk_buff *) (*p_txb & ~1);
+ sp = rxrpc_skb(txb);
+
+ switch (sacks[loop]) {
+ case RXRPC_ACK_TYPE_ACK:
+ sp->need_resend = false;
+ *p_txb |= 1;
+ break;
+ case RXRPC_ACK_TYPE_NACK:
+ sp->need_resend = true;
+ *p_txb &= ~1;
+ resend = 1;
+ break;
+ default:
+ _debug("Unsupported ACK type %d", sacks[loop]);
+ goto protocol_error;
+ }
+ }
+
+ smp_mb();
+ call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1);
+
+ /* anything not explicitly ACK'd is implicitly NACK'd, but may just not
+ * have been received or processed yet by the far end */
+ for (loop = call->acks_unacked;
+ loop != call->acks_head;
+ loop = (loop + 1) & (call->acks_winsz - 1)
+ ) {
+ p_txb = call->acks_window + loop;
+ smp_read_barrier_depends();
+ txb = (struct sk_buff *) (*p_txb & ~1);
+ sp = rxrpc_skb(txb);
+
+ if (*p_txb & 1) {
+ /* packet must have been discarded */
+ sp->need_resend = true;
+ *p_txb &= ~1;
+ resend |= 1;
+ } else if (sp->need_resend) {
+ ;
+ } else if (time_after_eq(jiffies + 1, sp->resend_at)) {
+ sp->need_resend = true;
+ resend |= 1;
+ } else if (resend & 2) {
+ if (time_before(sp->resend_at, resend_at))
+ resend_at = sp->resend_at;
+ } else {
+ resend_at = sp->resend_at;
+ resend |= 2;
+ }
+ }
+
+ rxrpc_set_resend(call, resend, resend_at);
+ _leave(" = 0");
+ return 0;
+
+protocol_error:
+ _leave(" = -EPROTO");
+ return -EPROTO;
+}
+
+/*
+ * discard hard-ACK'd packets from the Tx window
+ */
+static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard)
+{
+ unsigned long _skb;
+ int tail = call->acks_tail, old_tail;
+ int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz);
+
+ _enter("{%u,%u},%u", call->acks_hard, win, hard);
+
+ ASSERTCMP(hard - call->acks_hard, <=, win);
+
+ while (call->acks_hard < hard) {
+ smp_read_barrier_depends();
+ _skb = call->acks_window[tail] & ~1;
+ rxrpc_free_skb((struct sk_buff *) _skb);
+ old_tail = tail;
+ tail = (tail + 1) & (call->acks_winsz - 1);
+ call->acks_tail = tail;
+ if (call->acks_unacked == old_tail)
+ call->acks_unacked = tail;
+ call->acks_hard++;
+ }
+
+ wake_up(&call->tx_waitq);
+}
+
+/*
+ * clear the Tx window in the event of a failure
+ */
+static void rxrpc_clear_tx_window(struct rxrpc_call *call)
+{
+ rxrpc_rotate_tx_window(call, atomic_read(&call->sequence));
+}
+
+/*
+ * drain the out of sequence received packet queue into the packet Rx queue
+ */
+static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call)
+{
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+ bool terminal;
+ int ret;
+
+ _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos);
+
+ spin_lock_bh(&call->lock);
+
+ ret = -ECONNRESET;
+ if (test_bit(RXRPC_CALL_RELEASED, &call->flags))
+ goto socket_unavailable;
+
+ skb = skb_dequeue(&call->rx_oos_queue);
+ if (skb) {
+ sp = rxrpc_skb(skb);
+
+ _debug("drain OOS packet %d [%d]",
+ ntohl(sp->hdr.seq), call->rx_first_oos);
+
+ if (ntohl(sp->hdr.seq) != call->rx_first_oos) {
+ skb_queue_head(&call->rx_oos_queue, skb);
+ call->rx_first_oos = ntohl(rxrpc_skb(skb)->hdr.seq);
+ _debug("requeue %p {%u}", skb, call->rx_first_oos);
+ } else {
+ skb->mark = RXRPC_SKB_MARK_DATA;
+ terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
+ !(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
+ ret = rxrpc_queue_rcv_skb(call, skb, true, terminal);
+ BUG_ON(ret < 0);
+ _debug("drain #%u", call->rx_data_post);
+ call->rx_data_post++;
+
+ /* find out what the next packet is */
+ skb = skb_peek(&call->rx_oos_queue);
+ if (skb)
+ call->rx_first_oos =
+ ntohl(rxrpc_skb(skb)->hdr.seq);
+ else
+ call->rx_first_oos = 0;
+ _debug("peek %p {%u}", skb, call->rx_first_oos);
+ }
+ }
+
+ ret = 0;
+socket_unavailable:
+ spin_unlock_bh(&call->lock);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * insert an out of sequence packet into the buffer
+ */
+static void rxrpc_insert_oos_packet(struct rxrpc_call *call,
+ struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp, *psp;
+ struct sk_buff *p;
+ u32 seq;
+
+ sp = rxrpc_skb(skb);
+ seq = ntohl(sp->hdr.seq);
+ _enter(",,{%u}", seq);
+
+ skb->destructor = rxrpc_packet_destructor;
+ ASSERTCMP(sp->call, ==, NULL);
+ sp->call = call;
+ rxrpc_get_call(call);
+
+ /* insert into the buffer in sequence order */
+ spin_lock_bh(&call->lock);
+
+ skb_queue_walk(&call->rx_oos_queue, p) {
+ psp = rxrpc_skb(p);
+ if (ntohl(psp->hdr.seq) > seq) {
+ _debug("insert oos #%u before #%u",
+ seq, ntohl(psp->hdr.seq));
+ skb_insert(p, skb, &call->rx_oos_queue);
+ goto inserted;
+ }
+ }
+
+ _debug("append oos #%u", seq);
+ skb_queue_tail(&call->rx_oos_queue, skb);
+inserted:
+
+ /* we might now have a new front to the queue */
+ if (call->rx_first_oos == 0 || seq < call->rx_first_oos)
+ call->rx_first_oos = seq;
+
+ read_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ call->rx_data_post == call->rx_first_oos) {
+ _debug("drain rx oos now");
+ set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events);
+ }
+ read_unlock(&call->state_lock);
+
+ spin_unlock_bh(&call->lock);
+ _leave(" [stored #%u]", call->rx_first_oos);
+}
+
+/*
+ * clear the Tx window on final ACK reception
+ */
+static void rxrpc_zap_tx_window(struct rxrpc_call *call)
+{
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+ unsigned long _skb, *acks_window;
+ u8 winsz = call->acks_winsz;
+ int tail;
+
+ acks_window = call->acks_window;
+ call->acks_window = NULL;
+
+ while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) {
+ tail = call->acks_tail;
+ smp_read_barrier_depends();
+ _skb = acks_window[tail] & ~1;
+ smp_mb();
+ call->acks_tail = (call->acks_tail + 1) & (winsz - 1);
+
+ skb = (struct sk_buff *) _skb;
+ sp = rxrpc_skb(skb);
+ _debug("+++ clear Tx %u", ntohl(sp->hdr.seq));
+ rxrpc_free_skb(skb);
+ }
+
+ kfree(acks_window);
+}
+
+/*
+ * process the extra information that may be appended to an ACK packet
+ */
+static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
+ unsigned int latest, int nAcks)
+{
+ struct rxrpc_ackinfo ackinfo;
+ struct rxrpc_peer *peer;
+ unsigned int mtu;
+
+ if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) {
+ _leave(" [no ackinfo]");
+ return;
+ }
+
+ _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",
+ latest,
+ ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU),
+ ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max));
+
+ mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU));
+
+ peer = call->conn->trans->peer;
+ if (mtu < peer->maxdata) {
+ spin_lock_bh(&peer->lock);
+ peer->maxdata = mtu;
+ peer->mtu = mtu + peer->hdrsize;
+ spin_unlock_bh(&peer->lock);
+ _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata);
+ }
+}
+
+/*
+ * process packets in the reception queue
+ */
+static int rxrpc_process_rx_queue(struct rxrpc_call *call,
+ u32 *_abort_code)
+{
+ struct rxrpc_ackpacket ack;
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+ bool post_ACK;
+ int latest;
+ u32 hard, tx;
+
+ _enter("");
+
+process_further:
+ skb = skb_dequeue(&call->rx_queue);
+ if (!skb)
+ return -EAGAIN;
+
+ _net("deferred skb %p", skb);
+
+ sp = rxrpc_skb(skb);
+
+ _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state);
+
+ post_ACK = false;
+
+ switch (sp->hdr.type) {
+ /* data packets that wind up here have been received out of
+ * order, need security processing or are jumbo packets */
+ case RXRPC_PACKET_TYPE_DATA:
+ _proto("OOSQ DATA %%%u { #%u }",
+ ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
+
+ /* secured packets must be verified and possibly decrypted */
+ if (rxrpc_verify_packet(call, skb, _abort_code) < 0)
+ goto protocol_error;
+
+ rxrpc_insert_oos_packet(call, skb);
+ goto process_further;
+
+ /* partial ACK to process */
+ case RXRPC_PACKET_TYPE_ACK:
+ if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) {
+ _debug("extraction failure");
+ goto protocol_error;
+ }
+ if (!skb_pull(skb, sizeof(ack)))
+ BUG();
+
+ latest = ntohl(sp->hdr.serial);
+ hard = ntohl(ack.firstPacket);
+ tx = atomic_read(&call->sequence);
+
+ _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
+ latest,
+ ntohs(ack.maxSkew),
+ hard,
+ ntohl(ack.previousPacket),
+ ntohl(ack.serial),
+ rxrpc_acks(ack.reason),
+ ack.nAcks);
+
+ rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks);
+
+ if (ack.reason == RXRPC_ACK_PING) {
+ _proto("Rx ACK %%%u PING Request", latest);
+ rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
+ sp->hdr.serial, true);
+ }
+
+ /* discard any out-of-order or duplicate ACKs */
+ if (latest - call->acks_latest <= 0) {
+ _debug("discard ACK %d <= %d",
+ latest, call->acks_latest);
+ goto discard;
+ }
+ call->acks_latest = latest;
+
+ if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
+ call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY &&
+ call->state != RXRPC_CALL_SERVER_SEND_REPLY &&
+ call->state != RXRPC_CALL_SERVER_AWAIT_ACK)
+ goto discard;
+
+ _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state);
+
+ if (hard > 0) {
+ if (hard - 1 > tx) {
+ _debug("hard-ACK'd packet %d not transmitted"
+ " (%d top)",
+ hard - 1, tx);
+ goto protocol_error;
+ }
+
+ if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY ||
+ call->state == RXRPC_CALL_SERVER_AWAIT_ACK) &&
+ hard > tx)
+ goto all_acked;
+
+ smp_rmb();
+ rxrpc_rotate_tx_window(call, hard - 1);
+ }
+
+ if (ack.nAcks > 0) {
+ if (hard - 1 + ack.nAcks > tx) {
+ _debug("soft-ACK'd packet %d+%d not"
+ " transmitted (%d top)",
+ hard - 1, ack.nAcks, tx);
+ goto protocol_error;
+ }
+
+ if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0)
+ goto protocol_error;
+ }
+ goto discard;
+
+ /* complete ACK to process */
+ case RXRPC_PACKET_TYPE_ACKALL:
+ goto all_acked;
+
+ /* abort and busy are handled elsewhere */
+ case RXRPC_PACKET_TYPE_BUSY:
+ case RXRPC_PACKET_TYPE_ABORT:
+ BUG();
+
+ /* connection level events - also handled elsewhere */
+ case RXRPC_PACKET_TYPE_CHALLENGE:
+ case RXRPC_PACKET_TYPE_RESPONSE:
+ case RXRPC_PACKET_TYPE_DEBUG:
+ BUG();
+ }
+
+ /* if we've had a hard ACK that covers all the packets we've sent, then
+ * that ends that phase of the operation */
+all_acked:
+ write_lock_bh(&call->state_lock);
+ _debug("ack all %d", call->state);
+
+ switch (call->state) {
+ case RXRPC_CALL_CLIENT_AWAIT_REPLY:
+ call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
+ break;
+ case RXRPC_CALL_SERVER_AWAIT_ACK:
+ _debug("srv complete");
+ call->state = RXRPC_CALL_COMPLETE;
+ post_ACK = true;
+ break;
+ case RXRPC_CALL_CLIENT_SEND_REQUEST:
+ case RXRPC_CALL_SERVER_RECV_REQUEST:
+ goto protocol_error_unlock; /* can't occur yet */
+ default:
+ write_unlock_bh(&call->state_lock);
+ goto discard; /* assume packet left over from earlier phase */
+ }
+
+ write_unlock_bh(&call->state_lock);
+
+ /* if all the packets we sent are hard-ACK'd, then we can discard
+ * whatever we've got left */
+ _debug("clear Tx %d",
+ CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
+
+ del_timer_sync(&call->resend_timer);
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+
+ if (call->acks_window)
+ rxrpc_zap_tx_window(call);
+
+ if (post_ACK) {
+ /* post the final ACK message for userspace to pick up */
+ _debug("post ACK");
+ skb->mark = RXRPC_SKB_MARK_FINAL_ACK;
+ sp->call = call;
+ rxrpc_get_call(call);
+ spin_lock_bh(&call->lock);
+ if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0)
+ BUG();
+ spin_unlock_bh(&call->lock);
+ goto process_further;
+ }
+
+discard:
+ rxrpc_free_skb(skb);
+ goto process_further;
+
+protocol_error_unlock:
+ write_unlock_bh(&call->state_lock);
+protocol_error:
+ rxrpc_free_skb(skb);
+ _leave(" = -EPROTO");
+ return -EPROTO;
+}
+
+/*
+ * post a message to the socket Rx queue for recvmsg() to pick up
+ */
+static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error,
+ bool fatal)
+{
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+ int ret;
+
+ _enter("{%d,%lx},%u,%u,%d",
+ call->debug_id, call->flags, mark, error, fatal);
+
+ /* remove timers and things for fatal messages */
+ if (fatal) {
+ del_timer_sync(&call->resend_timer);
+ del_timer_sync(&call->ack_timer);
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ }
+
+ if (mark != RXRPC_SKB_MARK_NEW_CALL &&
+ !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+ _leave("[no userid]");
+ return 0;
+ }
+
+ if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
+ skb = alloc_skb(0, GFP_NOFS);
+ if (!skb)
+ return -ENOMEM;
+
+ rxrpc_new_skb(skb);
+
+ skb->mark = mark;
+
+ sp = rxrpc_skb(skb);
+ memset(sp, 0, sizeof(*sp));
+ sp->error = error;
+ sp->call = call;
+ rxrpc_get_call(call);
+
+ spin_lock_bh(&call->lock);
+ ret = rxrpc_queue_rcv_skb(call, skb, true, fatal);
+ spin_unlock_bh(&call->lock);
+ BUG_ON(ret < 0);
+ }
+
+ return 0;
+}
+
+/*
+ * handle background processing of incoming call packets and ACK / abort
+ * generation
+ */
+void rxrpc_process_call(struct work_struct *work)
+{
+ struct rxrpc_call *call =
+ container_of(work, struct rxrpc_call, processor);
+ struct rxrpc_ackpacket ack;
+ struct rxrpc_ackinfo ackinfo;
+ struct rxrpc_header hdr;
+ struct msghdr msg;
+ struct kvec iov[5];
+ unsigned long bits;
+ __be32 data, pad;
+ size_t len;
+ int genbit, loop, nbit, ioc, ret, mtu;
+ u32 abort_code = RX_PROTOCOL_ERROR;
+ u8 *acks = NULL;
+
+ //printk("\n--------------------\n");
+ _enter("{%d,%s,%lx} [%lu]",
+ call->debug_id, rxrpc_call_states[call->state], call->events,
+ (jiffies - call->creation_jif) / (HZ / 10));
+
+ if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) {
+ _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX");
+ return;
+ }
+
+ /* there's a good chance we're going to have to send a message, so set
+ * one up in advance */
+ msg.msg_name = &call->conn->trans->peer->srx.transport.sin;
+ msg.msg_namelen = sizeof(call->conn->trans->peer->srx.transport.sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ hdr.epoch = call->conn->epoch;
+ hdr.cid = call->cid;
+ hdr.callNumber = call->call_id;
+ hdr.seq = 0;
+ hdr.type = RXRPC_PACKET_TYPE_ACK;
+ hdr.flags = call->conn->out_clientflag;
+ hdr.userStatus = 0;
+ hdr.securityIndex = call->conn->security_ix;
+ hdr._rsvd = 0;
+ hdr.serviceId = call->conn->service_id;
+
+ memset(iov, 0, sizeof(iov));
+ iov[0].iov_base = &hdr;
+ iov[0].iov_len = sizeof(hdr);
+
+ /* deal with events of a final nature */
+ if (test_bit(RXRPC_CALL_RELEASE, &call->events)) {
+ rxrpc_release_call(call);
+ clear_bit(RXRPC_CALL_RELEASE, &call->events);
+ }
+
+ if (test_bit(RXRPC_CALL_RCVD_ERROR, &call->events)) {
+ int error;
+
+ clear_bit(RXRPC_CALL_CONN_ABORT, &call->events);
+ clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events);
+ clear_bit(RXRPC_CALL_ABORT, &call->events);
+
+ error = call->conn->trans->peer->net_error;
+ _debug("post net error %d", error);
+
+ if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR,
+ error, true) < 0)
+ goto no_mem;
+ clear_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
+ goto kill_ACKs;
+ }
+
+ if (test_bit(RXRPC_CALL_CONN_ABORT, &call->events)) {
+ ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE);
+
+ clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events);
+ clear_bit(RXRPC_CALL_ABORT, &call->events);
+
+ _debug("post conn abort");
+
+ if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
+ call->conn->error, true) < 0)
+ goto no_mem;
+ clear_bit(RXRPC_CALL_CONN_ABORT, &call->events);
+ goto kill_ACKs;
+ }
+
+ if (test_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) {
+ hdr.type = RXRPC_PACKET_TYPE_BUSY;
+ genbit = RXRPC_CALL_REJECT_BUSY;
+ goto send_message;
+ }
+
+ if (test_bit(RXRPC_CALL_ABORT, &call->events)) {
+ ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE);
+
+ if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
+ ECONNABORTED, true) < 0)
+ goto no_mem;
+ hdr.type = RXRPC_PACKET_TYPE_ABORT;
+ data = htonl(call->abort_code);
+ iov[1].iov_base = &data;
+ iov[1].iov_len = sizeof(data);
+ genbit = RXRPC_CALL_ABORT;
+ goto send_message;
+ }
+
+ if (test_bit(RXRPC_CALL_ACK_FINAL, &call->events)) {
+ genbit = RXRPC_CALL_ACK_FINAL;
+
+ ack.bufferSpace = htons(8);
+ ack.maxSkew = 0;
+ ack.serial = 0;
+ ack.reason = RXRPC_ACK_IDLE;
+ ack.nAcks = 0;
+ call->ackr_reason = 0;
+
+ spin_lock_bh(&call->lock);
+ ack.serial = call->ackr_serial;
+ ack.previousPacket = call->ackr_prev_seq;
+ ack.firstPacket = htonl(call->rx_data_eaten + 1);
+ spin_unlock_bh(&call->lock);
+
+ pad = 0;
+
+ iov[1].iov_base = &ack;
+ iov[1].iov_len = sizeof(ack);
+ iov[2].iov_base = &pad;
+ iov[2].iov_len = 3;
+ iov[3].iov_base = &ackinfo;
+ iov[3].iov_len = sizeof(ackinfo);
+ goto send_ACK;
+ }
+
+ if (call->events & ((1 << RXRPC_CALL_RCVD_BUSY) |
+ (1 << RXRPC_CALL_RCVD_ABORT))
+ ) {
+ u32 mark;
+
+ if (test_bit(RXRPC_CALL_RCVD_ABORT, &call->events))
+ mark = RXRPC_SKB_MARK_REMOTE_ABORT;
+ else
+ mark = RXRPC_SKB_MARK_BUSY;
+
+ _debug("post abort/busy");
+ rxrpc_clear_tx_window(call);
+ if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0)
+ goto no_mem;
+
+ clear_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
+ clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+ goto kill_ACKs;
+ }
+
+ if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL, &call->events)) {
+ _debug("do implicit ackall");
+ rxrpc_clear_tx_window(call);
+ }
+
+ if (test_bit(RXRPC_CALL_LIFE_TIMER, &call->events)) {
+ write_lock_bh(&call->state_lock);
+ if (call->state <= RXRPC_CALL_COMPLETE) {
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = RX_CALL_TIMEOUT;
+ set_bit(RXRPC_CALL_ABORT, &call->events);
+ }
+ write_unlock_bh(&call->state_lock);
+
+ _debug("post timeout");
+ if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
+ ETIME, true) < 0)
+ goto no_mem;
+
+ clear_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
+ goto kill_ACKs;
+ }
+
+ /* deal with assorted inbound messages */
+ if (!skb_queue_empty(&call->rx_queue)) {
+ switch (rxrpc_process_rx_queue(call, &abort_code)) {
+ case 0:
+ case -EAGAIN:
+ break;
+ case -ENOMEM:
+ goto no_mem;
+ case -EKEYEXPIRED:
+ case -EKEYREJECTED:
+ case -EPROTO:
+ rxrpc_abort_call(call, abort_code);
+ goto kill_ACKs;
+ }
+ }
+
+ /* handle resending */
+ if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
+ rxrpc_resend_timer(call);
+ if (test_and_clear_bit(RXRPC_CALL_RESEND, &call->events))
+ rxrpc_resend(call);
+
+ /* consider sending an ordinary ACK */
+ if (test_bit(RXRPC_CALL_ACK, &call->events)) {
+ _debug("send ACK: window: %d - %d { %lx }",
+ call->rx_data_eaten, call->ackr_win_top,
+ call->ackr_window[0]);
+
+ if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST &&
+ call->ackr_reason != RXRPC_ACK_PING_RESPONSE) {
+ /* ACK by sending reply DATA packet in this state */
+ clear_bit(RXRPC_CALL_ACK, &call->events);
+ goto maybe_reschedule;
+ }
+
+ genbit = RXRPC_CALL_ACK;
+
+ acks = kzalloc(call->ackr_win_top - call->rx_data_eaten,
+ GFP_NOFS);
+ if (!acks)
+ goto no_mem;
+
+ //hdr.flags = RXRPC_SLOW_START_OK;
+ ack.bufferSpace = htons(8);
+ ack.maxSkew = 0;
+ ack.serial = 0;
+ ack.reason = 0;
+
+ spin_lock_bh(&call->lock);
+ ack.reason = call->ackr_reason;
+ ack.serial = call->ackr_serial;
+ ack.previousPacket = call->ackr_prev_seq;
+ ack.firstPacket = htonl(call->rx_data_eaten + 1);
+
+ ack.nAcks = 0;
+ for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) {
+ nbit = loop * BITS_PER_LONG;
+ for (bits = call->ackr_window[loop]; bits; bits >>= 1
+ ) {
+ _debug("- l=%d n=%d b=%lx", loop, nbit, bits);
+ if (bits & 1) {
+ acks[nbit] = RXRPC_ACK_TYPE_ACK;
+ ack.nAcks = nbit + 1;
+ }
+ nbit++;
+ }
+ }
+ call->ackr_reason = 0;
+ spin_unlock_bh(&call->lock);
+
+ pad = 0;
+
+ iov[1].iov_base = &ack;
+ iov[1].iov_len = sizeof(ack);
+ iov[2].iov_base = acks;
+ iov[2].iov_len = ack.nAcks;
+ iov[3].iov_base = &pad;
+ iov[3].iov_len = 3;
+ iov[4].iov_base = &ackinfo;
+ iov[4].iov_len = sizeof(ackinfo);
+
+ switch (ack.reason) {
+ case RXRPC_ACK_REQUESTED:
+ case RXRPC_ACK_DUPLICATE:
+ case RXRPC_ACK_OUT_OF_SEQUENCE:
+ case RXRPC_ACK_EXCEEDS_WINDOW:
+ case RXRPC_ACK_NOSPACE:
+ case RXRPC_ACK_PING:
+ case RXRPC_ACK_PING_RESPONSE:
+ goto send_ACK_with_skew;
+ case RXRPC_ACK_DELAY:
+ case RXRPC_ACK_IDLE:
+ goto send_ACK;
+ }
+ }
+
+ /* handle completion of security negotiations on an incoming
+ * connection */
+ if (test_and_clear_bit(RXRPC_CALL_SECURED, &call->events)) {
+ _debug("secured");
+ spin_lock_bh(&call->lock);
+
+ if (call->state == RXRPC_CALL_SERVER_SECURING) {
+ _debug("securing");
+ write_lock(&call->conn->lock);
+ if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+ !test_bit(RXRPC_CALL_RELEASE, &call->events)) {
+ _debug("not released");
+ call->state = RXRPC_CALL_SERVER_ACCEPTING;
+ list_move_tail(&call->accept_link,
+ &call->socket->acceptq);
+ }
+ write_unlock(&call->conn->lock);
+ read_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE)
+ set_bit(RXRPC_CALL_POST_ACCEPT, &call->events);
+ read_unlock(&call->state_lock);
+ }
+
+ spin_unlock_bh(&call->lock);
+ if (!test_bit(RXRPC_CALL_POST_ACCEPT, &call->events))
+ goto maybe_reschedule;
+ }
+
+ /* post a notification of an acceptable connection to the app */
+ if (test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) {
+ _debug("post accept");
+ if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL,
+ 0, false) < 0)
+ goto no_mem;
+ clear_bit(RXRPC_CALL_POST_ACCEPT, &call->events);
+ goto maybe_reschedule;
+ }
+
+ /* handle incoming call acceptance */
+ if (test_and_clear_bit(RXRPC_CALL_ACCEPTED, &call->events)) {
+ _debug("accepted");
+ ASSERTCMP(call->rx_data_post, ==, 0);
+ call->rx_data_post = 1;
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE)
+ set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events);
+ read_unlock_bh(&call->state_lock);
+ }
+
+ /* drain the out of sequence received packet queue into the packet Rx
+ * queue */
+ if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) {
+ while (call->rx_data_post == call->rx_first_oos)
+ if (rxrpc_drain_rx_oos_queue(call) < 0)
+ break;
+ goto maybe_reschedule;
+ }
+
+ /* other events may have been raised since we started checking */
+ goto maybe_reschedule;
+
+send_ACK_with_skew:
+ ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) -
+ ntohl(ack.serial));
+send_ACK:
+ mtu = call->conn->trans->peer->if_mtu;
+ mtu -= call->conn->trans->peer->hdrsize;
+ ackinfo.maxMTU = htonl(mtu);
+ ackinfo.rwind = htonl(rxrpc_rx_window_size);
+
+ /* permit the peer to send us jumbo packets if it wants to */
+ ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
+ ackinfo.jumbo_max = htonl(rxrpc_rx_jumbo_max);
+
+ hdr.serial = htonl(atomic_inc_return(&call->conn->serial));
+ _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
+ ntohl(hdr.serial),
+ ntohs(ack.maxSkew),
+ ntohl(ack.firstPacket),
+ ntohl(ack.previousPacket),
+ ntohl(ack.serial),
+ rxrpc_acks(ack.reason),
+ ack.nAcks);
+
+ del_timer_sync(&call->ack_timer);
+ if (ack.nAcks > 0)
+ set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags);
+ goto send_message_2;
+
+send_message:
+ _debug("send message");
+
+ hdr.serial = htonl(atomic_inc_return(&call->conn->serial));
+ _proto("Tx %s %%%u", rxrpc_pkts[hdr.type], ntohl(hdr.serial));
+send_message_2:
+
+ len = iov[0].iov_len;
+ ioc = 1;
+ if (iov[4].iov_len) {
+ ioc = 5;
+ len += iov[4].iov_len;
+ len += iov[3].iov_len;
+ len += iov[2].iov_len;
+ len += iov[1].iov_len;
+ } else if (iov[3].iov_len) {
+ ioc = 4;
+ len += iov[3].iov_len;
+ len += iov[2].iov_len;
+ len += iov[1].iov_len;
+ } else if (iov[2].iov_len) {
+ ioc = 3;
+ len += iov[2].iov_len;
+ len += iov[1].iov_len;
+ } else if (iov[1].iov_len) {
+ ioc = 2;
+ len += iov[1].iov_len;
+ }
+
+ ret = kernel_sendmsg(call->conn->trans->local->socket,
+ &msg, iov, ioc, len);
+ if (ret < 0) {
+ _debug("sendmsg failed: %d", ret);
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_DEAD)
+ rxrpc_queue_call(call);
+ read_unlock_bh(&call->state_lock);
+ goto error;
+ }
+
+ switch (genbit) {
+ case RXRPC_CALL_ABORT:
+ clear_bit(genbit, &call->events);
+ clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+ goto kill_ACKs;
+
+ case RXRPC_CALL_ACK_FINAL:
+ write_lock_bh(&call->state_lock);
+ if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK)
+ call->state = RXRPC_CALL_COMPLETE;
+ write_unlock_bh(&call->state_lock);
+ goto kill_ACKs;
+
+ default:
+ clear_bit(genbit, &call->events);
+ switch (call->state) {
+ case RXRPC_CALL_CLIENT_AWAIT_REPLY:
+ case RXRPC_CALL_CLIENT_RECV_REPLY:
+ case RXRPC_CALL_SERVER_RECV_REQUEST:
+ case RXRPC_CALL_SERVER_ACK_REQUEST:
+ _debug("start ACK timer");
+ rxrpc_propose_ACK(call, RXRPC_ACK_DELAY,
+ call->ackr_serial, false);
+ default:
+ break;
+ }
+ goto maybe_reschedule;
+ }
+
+kill_ACKs:
+ del_timer_sync(&call->ack_timer);
+ if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL, &call->events))
+ rxrpc_put_call(call);
+ clear_bit(RXRPC_CALL_ACK, &call->events);
+
+maybe_reschedule:
+ if (call->events || !skb_queue_empty(&call->rx_queue)) {
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_DEAD)
+ rxrpc_queue_call(call);
+ read_unlock_bh(&call->state_lock);
+ }
+
+ /* don't leave aborted connections on the accept queue */
+ if (call->state >= RXRPC_CALL_COMPLETE &&
+ !list_empty(&call->accept_link)) {
+ _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }",
+ call, call->events, call->flags,
+ ntohl(call->conn->cid));
+
+ read_lock_bh(&call->state_lock);
+ if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+ !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock_bh(&call->state_lock);
+ }
+
+error:
+ clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags);
+ kfree(acks);
+
+ /* because we don't want two CPUs both processing the work item for one
+ * call at the same time, we use a flag to note when it's busy; however
+ * this means there's a race between clearing the flag and setting the
+ * work pending bit and the work item being processed again */
+ if (call->events && !work_pending(&call->processor)) {
+ _debug("jumpstart %x", ntohl(call->conn->cid));
+ rxrpc_queue_call(call);
+ }
+
+ _leave("");
+ return;
+
+no_mem:
+ _debug("out of memory");
+ goto maybe_reschedule;
+}
diff --git a/net/rxrpc/ar-call.c b/net/rxrpc/ar-call.c
new file mode 100644
index 000000000..a9e05db0f
--- /dev/null
+++ b/net/rxrpc/ar-call.c
@@ -0,0 +1,1019 @@
+/* RxRPC individual remote procedure call handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/circ_buf.h>
+#include <linux/hashtable.h>
+#include <linux/spinlock_types.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * Maximum lifetime of a call (in jiffies).
+ */
+unsigned rxrpc_max_call_lifetime = 60 * HZ;
+
+/*
+ * Time till dead call expires after last use (in jiffies).
+ */
+unsigned rxrpc_dead_call_expiry = 2 * HZ;
+
+const char *const rxrpc_call_states[] = {
+ [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
+ [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
+ [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
+ [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK",
+ [RXRPC_CALL_SERVER_SECURING] = "SvSecure",
+ [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
+ [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
+ [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
+ [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
+ [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
+ [RXRPC_CALL_COMPLETE] = "Complete",
+ [RXRPC_CALL_SERVER_BUSY] = "SvBusy ",
+ [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
+ [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
+ [RXRPC_CALL_NETWORK_ERROR] = "NetError",
+ [RXRPC_CALL_DEAD] = "Dead ",
+};
+
+struct kmem_cache *rxrpc_call_jar;
+LIST_HEAD(rxrpc_calls);
+DEFINE_RWLOCK(rxrpc_call_lock);
+
+static void rxrpc_destroy_call(struct work_struct *work);
+static void rxrpc_call_life_expired(unsigned long _call);
+static void rxrpc_dead_call_expired(unsigned long _call);
+static void rxrpc_ack_time_expired(unsigned long _call);
+static void rxrpc_resend_time_expired(unsigned long _call);
+
+static DEFINE_SPINLOCK(rxrpc_call_hash_lock);
+static DEFINE_HASHTABLE(rxrpc_call_hash, 10);
+
+/*
+ * Hash function for rxrpc_call_hash
+ */
+static unsigned long rxrpc_call_hashfunc(
+ u8 clientflag,
+ __be32 cid,
+ __be32 call_id,
+ __be32 epoch,
+ __be16 service_id,
+ sa_family_t proto,
+ void *localptr,
+ unsigned int addr_size,
+ const u8 *peer_addr)
+{
+ const u16 *p;
+ unsigned int i;
+ unsigned long key;
+ u32 hcid = ntohl(cid);
+
+ _enter("");
+
+ key = (unsigned long)localptr;
+ /* We just want to add up the __be32 values, so forcing the
+ * cast should be okay.
+ */
+ key += (__force u32)epoch;
+ key += (__force u16)service_id;
+ key += (__force u32)call_id;
+ key += (hcid & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT;
+ key += hcid & RXRPC_CHANNELMASK;
+ key += clientflag;
+ key += proto;
+ /* Step through the peer address in 16-bit portions for speed */
+ for (i = 0, p = (const u16 *)peer_addr; i < addr_size >> 1; i++, p++)
+ key += *p;
+ _leave(" key = 0x%lx", key);
+ return key;
+}
+
+/*
+ * Add a call to the hashtable
+ */
+static void rxrpc_call_hash_add(struct rxrpc_call *call)
+{
+ unsigned long key;
+ unsigned int addr_size = 0;
+
+ _enter("");
+ switch (call->proto) {
+ case AF_INET:
+ addr_size = sizeof(call->peer_ip.ipv4_addr);
+ break;
+ case AF_INET6:
+ addr_size = sizeof(call->peer_ip.ipv6_addr);
+ break;
+ default:
+ break;
+ }
+ key = rxrpc_call_hashfunc(call->in_clientflag, call->cid,
+ call->call_id, call->epoch,
+ call->service_id, call->proto,
+ call->conn->trans->local, addr_size,
+ call->peer_ip.ipv6_addr);
+ /* Store the full key in the call */
+ call->hash_key = key;
+ spin_lock(&rxrpc_call_hash_lock);
+ hash_add_rcu(rxrpc_call_hash, &call->hash_node, key);
+ spin_unlock(&rxrpc_call_hash_lock);
+ _leave("");
+}
+
+/*
+ * Remove a call from the hashtable
+ */
+static void rxrpc_call_hash_del(struct rxrpc_call *call)
+{
+ _enter("");
+ spin_lock(&rxrpc_call_hash_lock);
+ hash_del_rcu(&call->hash_node);
+ spin_unlock(&rxrpc_call_hash_lock);
+ _leave("");
+}
+
+/*
+ * Find a call in the hashtable and return it, or NULL if it
+ * isn't there.
+ */
+struct rxrpc_call *rxrpc_find_call_hash(
+ u8 clientflag,
+ __be32 cid,
+ __be32 call_id,
+ __be32 epoch,
+ __be16 service_id,
+ void *localptr,
+ sa_family_t proto,
+ const u8 *peer_addr)
+{
+ unsigned long key;
+ unsigned int addr_size = 0;
+ struct rxrpc_call *call = NULL;
+ struct rxrpc_call *ret = NULL;
+
+ _enter("");
+ switch (proto) {
+ case AF_INET:
+ addr_size = sizeof(call->peer_ip.ipv4_addr);
+ break;
+ case AF_INET6:
+ addr_size = sizeof(call->peer_ip.ipv6_addr);
+ break;
+ default:
+ break;
+ }
+
+ key = rxrpc_call_hashfunc(clientflag, cid, call_id, epoch,
+ service_id, proto, localptr, addr_size,
+ peer_addr);
+ hash_for_each_possible_rcu(rxrpc_call_hash, call, hash_node, key) {
+ if (call->hash_key == key &&
+ call->call_id == call_id &&
+ call->cid == cid &&
+ call->in_clientflag == clientflag &&
+ call->service_id == service_id &&
+ call->proto == proto &&
+ call->local == localptr &&
+ memcmp(call->peer_ip.ipv6_addr, peer_addr,
+ addr_size) == 0 &&
+ call->epoch == epoch) {
+ ret = call;
+ break;
+ }
+ }
+ _leave(" = %p", ret);
+ return ret;
+}
+
+/*
+ * allocate a new call
+ */
+static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
+{
+ struct rxrpc_call *call;
+
+ call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
+ if (!call)
+ return NULL;
+
+ call->acks_winsz = 16;
+ call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long),
+ gfp);
+ if (!call->acks_window) {
+ kmem_cache_free(rxrpc_call_jar, call);
+ return NULL;
+ }
+
+ setup_timer(&call->lifetimer, &rxrpc_call_life_expired,
+ (unsigned long) call);
+ setup_timer(&call->deadspan, &rxrpc_dead_call_expired,
+ (unsigned long) call);
+ setup_timer(&call->ack_timer, &rxrpc_ack_time_expired,
+ (unsigned long) call);
+ setup_timer(&call->resend_timer, &rxrpc_resend_time_expired,
+ (unsigned long) call);
+ INIT_WORK(&call->destroyer, &rxrpc_destroy_call);
+ INIT_WORK(&call->processor, &rxrpc_process_call);
+ INIT_LIST_HEAD(&call->accept_link);
+ skb_queue_head_init(&call->rx_queue);
+ skb_queue_head_init(&call->rx_oos_queue);
+ init_waitqueue_head(&call->tx_waitq);
+ spin_lock_init(&call->lock);
+ rwlock_init(&call->state_lock);
+ atomic_set(&call->usage, 1);
+ call->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
+
+ memset(&call->sock_node, 0xed, sizeof(call->sock_node));
+
+ call->rx_data_expect = 1;
+ call->rx_data_eaten = 0;
+ call->rx_first_oos = 0;
+ call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size;
+ call->creation_jif = jiffies;
+ return call;
+}
+
+/*
+ * allocate a new client call and attempt to get a connection slot for it
+ */
+static struct rxrpc_call *rxrpc_alloc_client_call(
+ struct rxrpc_sock *rx,
+ struct rxrpc_transport *trans,
+ struct rxrpc_conn_bundle *bundle,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call;
+ int ret;
+
+ _enter("");
+
+ ASSERT(rx != NULL);
+ ASSERT(trans != NULL);
+ ASSERT(bundle != NULL);
+
+ call = rxrpc_alloc_call(gfp);
+ if (!call)
+ return ERR_PTR(-ENOMEM);
+
+ sock_hold(&rx->sk);
+ call->socket = rx;
+ call->rx_data_post = 1;
+
+ ret = rxrpc_connect_call(rx, trans, bundle, call, gfp);
+ if (ret < 0) {
+ kmem_cache_free(rxrpc_call_jar, call);
+ return ERR_PTR(ret);
+ }
+
+ /* Record copies of information for hashtable lookup */
+ call->proto = rx->proto;
+ call->local = trans->local;
+ switch (call->proto) {
+ case AF_INET:
+ call->peer_ip.ipv4_addr =
+ trans->peer->srx.transport.sin.sin_addr.s_addr;
+ break;
+ case AF_INET6:
+ memcpy(call->peer_ip.ipv6_addr,
+ trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8,
+ sizeof(call->peer_ip.ipv6_addr));
+ break;
+ }
+ call->epoch = call->conn->epoch;
+ call->service_id = call->conn->service_id;
+ call->in_clientflag = call->conn->in_clientflag;
+ /* Add the new call to the hashtable */
+ rxrpc_call_hash_add(call);
+
+ spin_lock(&call->conn->trans->peer->lock);
+ list_add(&call->error_link, &call->conn->trans->peer->error_targets);
+ spin_unlock(&call->conn->trans->peer->lock);
+
+ call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
+ add_timer(&call->lifetimer);
+
+ _leave(" = %p", call);
+ return call;
+}
+
+/*
+ * set up a call for the given data
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx,
+ struct rxrpc_transport *trans,
+ struct rxrpc_conn_bundle *bundle,
+ unsigned long user_call_ID,
+ int create,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call, *candidate;
+ struct rb_node *p, *parent, **pp;
+
+ _enter("%p,%d,%d,%lx,%d",
+ rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1,
+ user_call_ID, create);
+
+ /* search the extant calls first for one that matches the specified
+ * user ID */
+ read_lock(&rx->call_lock);
+
+ p = rx->calls.rb_node;
+ while (p) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ p = p->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ p = p->rb_right;
+ else
+ goto found_extant_call;
+ }
+
+ read_unlock(&rx->call_lock);
+
+ if (!create || !trans)
+ return ERR_PTR(-EBADSLT);
+
+ /* not yet present - create a candidate for a new record and then
+ * redo the search */
+ candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp);
+ if (IS_ERR(candidate)) {
+ _leave(" = %ld", PTR_ERR(candidate));
+ return candidate;
+ }
+
+ candidate->user_call_ID = user_call_ID;
+ __set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags);
+
+ write_lock(&rx->call_lock);
+
+ pp = &rx->calls.rb_node;
+ parent = NULL;
+ while (*pp) {
+ parent = *pp;
+ call = rb_entry(parent, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ pp = &(*pp)->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ pp = &(*pp)->rb_right;
+ else
+ goto found_extant_second;
+ }
+
+ /* second search also failed; add the new call */
+ call = candidate;
+ candidate = NULL;
+ rxrpc_get_call(call);
+
+ rb_link_node(&call->sock_node, parent, pp);
+ rb_insert_color(&call->sock_node, &rx->calls);
+ write_unlock(&rx->call_lock);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_add_tail(&call->link, &rxrpc_calls);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+ _leave(" = %p [new]", call);
+ return call;
+
+ /* we found the call in the list immediately */
+found_extant_call:
+ rxrpc_get_call(call);
+ read_unlock(&rx->call_lock);
+ _leave(" = %p [extant %d]", call, atomic_read(&call->usage));
+ return call;
+
+ /* we found the call on the second time through the list */
+found_extant_second:
+ rxrpc_get_call(call);
+ write_unlock(&rx->call_lock);
+ rxrpc_put_call(candidate);
+ _leave(" = %p [second %d]", call, atomic_read(&call->usage));
+ return call;
+}
+
+/*
+ * set up an incoming call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
+ struct rxrpc_connection *conn,
+ struct rxrpc_header *hdr,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call, *candidate;
+ struct rb_node **p, *parent;
+ __be32 call_id;
+
+ _enter(",%d,,%x", conn->debug_id, gfp);
+
+ ASSERT(rx != NULL);
+
+ candidate = rxrpc_alloc_call(gfp);
+ if (!candidate)
+ return ERR_PTR(-EBUSY);
+
+ candidate->socket = rx;
+ candidate->conn = conn;
+ candidate->cid = hdr->cid;
+ candidate->call_id = hdr->callNumber;
+ candidate->channel = ntohl(hdr->cid) & RXRPC_CHANNELMASK;
+ candidate->rx_data_post = 0;
+ candidate->state = RXRPC_CALL_SERVER_ACCEPTING;
+ if (conn->security_ix > 0)
+ candidate->state = RXRPC_CALL_SERVER_SECURING;
+
+ write_lock_bh(&conn->lock);
+
+ /* set the channel for this call */
+ call = conn->channels[candidate->channel];
+ _debug("channel[%u] is %p", candidate->channel, call);
+ if (call && call->call_id == hdr->callNumber) {
+ /* already set; must've been a duplicate packet */
+ _debug("extant call [%d]", call->state);
+ ASSERTCMP(call->conn, ==, conn);
+
+ read_lock(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_LOCALLY_ABORTED:
+ if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
+ rxrpc_queue_call(call);
+ case RXRPC_CALL_REMOTELY_ABORTED:
+ read_unlock(&call->state_lock);
+ goto aborted_call;
+ default:
+ rxrpc_get_call(call);
+ read_unlock(&call->state_lock);
+ goto extant_call;
+ }
+ }
+
+ if (call) {
+ /* it seems the channel is still in use from the previous call
+ * - ditch the old binding if its call is now complete */
+ _debug("CALL: %u { %s }",
+ call->debug_id, rxrpc_call_states[call->state]);
+
+ if (call->state >= RXRPC_CALL_COMPLETE) {
+ conn->channels[call->channel] = NULL;
+ } else {
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -EBUSY");
+ return ERR_PTR(-EBUSY);
+ }
+ }
+
+ /* check the call number isn't duplicate */
+ _debug("check dup");
+ call_id = hdr->callNumber;
+ p = &conn->calls.rb_node;
+ parent = NULL;
+ while (*p) {
+ parent = *p;
+ call = rb_entry(parent, struct rxrpc_call, conn_node);
+
+ /* The tree is sorted in order of the __be32 value without
+ * turning it into host order.
+ */
+ if ((__force u32)call_id < (__force u32)call->call_id)
+ p = &(*p)->rb_left;
+ else if ((__force u32)call_id > (__force u32)call->call_id)
+ p = &(*p)->rb_right;
+ else
+ goto old_call;
+ }
+
+ /* make the call available */
+ _debug("new call");
+ call = candidate;
+ candidate = NULL;
+ rb_link_node(&call->conn_node, parent, p);
+ rb_insert_color(&call->conn_node, &conn->calls);
+ conn->channels[call->channel] = call;
+ sock_hold(&rx->sk);
+ atomic_inc(&conn->usage);
+ write_unlock_bh(&conn->lock);
+
+ spin_lock(&conn->trans->peer->lock);
+ list_add(&call->error_link, &conn->trans->peer->error_targets);
+ spin_unlock(&conn->trans->peer->lock);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_add_tail(&call->link, &rxrpc_calls);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ /* Record copies of information for hashtable lookup */
+ call->proto = rx->proto;
+ call->local = conn->trans->local;
+ switch (call->proto) {
+ case AF_INET:
+ call->peer_ip.ipv4_addr =
+ conn->trans->peer->srx.transport.sin.sin_addr.s_addr;
+ break;
+ case AF_INET6:
+ memcpy(call->peer_ip.ipv6_addr,
+ conn->trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8,
+ sizeof(call->peer_ip.ipv6_addr));
+ break;
+ default:
+ break;
+ }
+ call->epoch = conn->epoch;
+ call->service_id = conn->service_id;
+ call->in_clientflag = conn->in_clientflag;
+ /* Add the new call to the hashtable */
+ rxrpc_call_hash_add(call);
+
+ _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+ call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
+ add_timer(&call->lifetimer);
+ _leave(" = %p {%d} [new]", call, call->debug_id);
+ return call;
+
+extant_call:
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1);
+ return call;
+
+aborted_call:
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -ECONNABORTED");
+ return ERR_PTR(-ECONNABORTED);
+
+old_call:
+ write_unlock_bh(&conn->lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -ECONNRESET [old]");
+ return ERR_PTR(-ECONNRESET);
+}
+
+/*
+ * find an extant server call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx,
+ unsigned long user_call_ID)
+{
+ struct rxrpc_call *call;
+ struct rb_node *p;
+
+ _enter("%p,%lx", rx, user_call_ID);
+
+ /* search the extant calls for one that matches the specified user
+ * ID */
+ read_lock(&rx->call_lock);
+
+ p = rx->calls.rb_node;
+ while (p) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ p = p->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ p = p->rb_right;
+ else
+ goto found_extant_call;
+ }
+
+ read_unlock(&rx->call_lock);
+ _leave(" = NULL");
+ return NULL;
+
+ /* we found the call in the list immediately */
+found_extant_call:
+ rxrpc_get_call(call);
+ read_unlock(&rx->call_lock);
+ _leave(" = %p [%d]", call, atomic_read(&call->usage));
+ return call;
+}
+
+/*
+ * detach a call from a socket and set up for release
+ */
+void rxrpc_release_call(struct rxrpc_call *call)
+{
+ struct rxrpc_connection *conn = call->conn;
+ struct rxrpc_sock *rx = call->socket;
+
+ _enter("{%d,%d,%d,%d}",
+ call->debug_id, atomic_read(&call->usage),
+ atomic_read(&call->ackr_not_idle),
+ call->rx_first_oos);
+
+ spin_lock_bh(&call->lock);
+ if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
+ BUG();
+ spin_unlock_bh(&call->lock);
+
+ /* dissociate from the socket
+ * - the socket's ref on the call is passed to the death timer
+ */
+ _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
+
+ write_lock_bh(&rx->call_lock);
+ if (!list_empty(&call->accept_link)) {
+ _debug("unlinking once-pending call %p { e=%lx f=%lx }",
+ call, call->events, call->flags);
+ ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+ list_del_init(&call->accept_link);
+ sk_acceptq_removed(&rx->sk);
+ } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+ rb_erase(&call->sock_node, &rx->calls);
+ memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
+ clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
+ }
+ write_unlock_bh(&rx->call_lock);
+
+ /* free up the channel for reuse */
+ spin_lock(&conn->trans->client_lock);
+ write_lock_bh(&conn->lock);
+ write_lock(&call->state_lock);
+
+ if (conn->channels[call->channel] == call)
+ conn->channels[call->channel] = NULL;
+
+ if (conn->out_clientflag && conn->bundle) {
+ conn->avail_calls++;
+ switch (conn->avail_calls) {
+ case 1:
+ list_move_tail(&conn->bundle_link,
+ &conn->bundle->avail_conns);
+ case 2 ... RXRPC_MAXCALLS - 1:
+ ASSERT(conn->channels[0] == NULL ||
+ conn->channels[1] == NULL ||
+ conn->channels[2] == NULL ||
+ conn->channels[3] == NULL);
+ break;
+ case RXRPC_MAXCALLS:
+ list_move_tail(&conn->bundle_link,
+ &conn->bundle->unused_conns);
+ ASSERT(conn->channels[0] == NULL &&
+ conn->channels[1] == NULL &&
+ conn->channels[2] == NULL &&
+ conn->channels[3] == NULL);
+ break;
+ default:
+ printk(KERN_ERR "RxRPC: conn->avail_calls=%d\n",
+ conn->avail_calls);
+ BUG();
+ }
+ }
+
+ spin_unlock(&conn->trans->client_lock);
+
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
+ _debug("+++ ABORTING STATE %d +++\n", call->state);
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = RX_CALL_DEAD;
+ set_bit(RXRPC_CALL_ABORT, &call->events);
+ rxrpc_queue_call(call);
+ }
+ write_unlock(&call->state_lock);
+ write_unlock_bh(&conn->lock);
+
+ /* clean up the Rx queue */
+ if (!skb_queue_empty(&call->rx_queue) ||
+ !skb_queue_empty(&call->rx_oos_queue)) {
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+
+ _debug("purge Rx queues");
+
+ spin_lock_bh(&call->lock);
+ while ((skb = skb_dequeue(&call->rx_queue)) ||
+ (skb = skb_dequeue(&call->rx_oos_queue))) {
+ sp = rxrpc_skb(skb);
+ if (sp->call) {
+ ASSERTCMP(sp->call, ==, call);
+ rxrpc_put_call(call);
+ sp->call = NULL;
+ }
+ skb->destructor = NULL;
+ spin_unlock_bh(&call->lock);
+
+ _debug("- zap %s %%%u #%u",
+ rxrpc_pkts[sp->hdr.type],
+ ntohl(sp->hdr.serial),
+ ntohl(sp->hdr.seq));
+ rxrpc_free_skb(skb);
+ spin_lock_bh(&call->lock);
+ }
+ spin_unlock_bh(&call->lock);
+
+ ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE);
+ }
+
+ del_timer_sync(&call->resend_timer);
+ del_timer_sync(&call->ack_timer);
+ del_timer_sync(&call->lifetimer);
+ call->deadspan.expires = jiffies + rxrpc_dead_call_expiry;
+ add_timer(&call->deadspan);
+
+ _leave("");
+}
+
+/*
+ * handle a dead call being ready for reaping
+ */
+static void rxrpc_dead_call_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ write_lock_bh(&call->state_lock);
+ call->state = RXRPC_CALL_DEAD;
+ write_unlock_bh(&call->state_lock);
+ rxrpc_put_call(call);
+}
+
+/*
+ * mark a call as to be released, aborting it if it's still in progress
+ * - called with softirqs disabled
+ */
+static void rxrpc_mark_call_released(struct rxrpc_call *call)
+{
+ bool sched;
+
+ write_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_DEAD) {
+ sched = false;
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ _debug("abort call %p", call);
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = RX_CALL_DEAD;
+ if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
+ sched = true;
+ }
+ if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+ sched = true;
+ if (sched)
+ rxrpc_queue_call(call);
+ }
+ write_unlock(&call->state_lock);
+}
+
+/*
+ * release all the calls associated with a socket
+ */
+void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
+{
+ struct rxrpc_call *call;
+ struct rb_node *p;
+
+ _enter("%p", rx);
+
+ read_lock_bh(&rx->call_lock);
+
+ /* mark all the calls as no longer wanting incoming packets */
+ for (p = rb_first(&rx->calls); p; p = rb_next(p)) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+ rxrpc_mark_call_released(call);
+ }
+
+ /* kill the not-yet-accepted incoming calls */
+ list_for_each_entry(call, &rx->secureq, accept_link) {
+ rxrpc_mark_call_released(call);
+ }
+
+ list_for_each_entry(call, &rx->acceptq, accept_link) {
+ rxrpc_mark_call_released(call);
+ }
+
+ read_unlock_bh(&rx->call_lock);
+ _leave("");
+}
+
+/*
+ * release a call
+ */
+void __rxrpc_put_call(struct rxrpc_call *call)
+{
+ ASSERT(call != NULL);
+
+ _enter("%p{u=%d}", call, atomic_read(&call->usage));
+
+ ASSERTCMP(atomic_read(&call->usage), >, 0);
+
+ if (atomic_dec_and_test(&call->usage)) {
+ _debug("call %d dead", call->debug_id);
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+ rxrpc_queue_work(&call->destroyer);
+ }
+ _leave("");
+}
+
+/*
+ * clean up a call
+ */
+static void rxrpc_cleanup_call(struct rxrpc_call *call)
+{
+ _net("DESTROY CALL %d", call->debug_id);
+
+ ASSERT(call->socket);
+
+ memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
+
+ del_timer_sync(&call->lifetimer);
+ del_timer_sync(&call->deadspan);
+ del_timer_sync(&call->ack_timer);
+ del_timer_sync(&call->resend_timer);
+
+ ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
+ ASSERTCMP(call->events, ==, 0);
+ if (work_pending(&call->processor)) {
+ _debug("defer destroy");
+ rxrpc_queue_work(&call->destroyer);
+ return;
+ }
+
+ if (call->conn) {
+ spin_lock(&call->conn->trans->peer->lock);
+ list_del(&call->error_link);
+ spin_unlock(&call->conn->trans->peer->lock);
+
+ write_lock_bh(&call->conn->lock);
+ rb_erase(&call->conn_node, &call->conn->calls);
+ write_unlock_bh(&call->conn->lock);
+ rxrpc_put_connection(call->conn);
+ }
+
+ /* Remove the call from the hash */
+ rxrpc_call_hash_del(call);
+
+ if (call->acks_window) {
+ _debug("kill Tx window %d",
+ CIRC_CNT(call->acks_head, call->acks_tail,
+ call->acks_winsz));
+ smp_mb();
+ while (CIRC_CNT(call->acks_head, call->acks_tail,
+ call->acks_winsz) > 0) {
+ struct rxrpc_skb_priv *sp;
+ unsigned long _skb;
+
+ _skb = call->acks_window[call->acks_tail] & ~1;
+ sp = rxrpc_skb((struct sk_buff *) _skb);
+ _debug("+++ clear Tx %u", ntohl(sp->hdr.seq));
+ rxrpc_free_skb((struct sk_buff *) _skb);
+ call->acks_tail =
+ (call->acks_tail + 1) & (call->acks_winsz - 1);
+ }
+
+ kfree(call->acks_window);
+ }
+
+ rxrpc_free_skb(call->tx_pending);
+
+ rxrpc_purge_queue(&call->rx_queue);
+ ASSERT(skb_queue_empty(&call->rx_oos_queue));
+ sock_put(&call->socket->sk);
+ kmem_cache_free(rxrpc_call_jar, call);
+}
+
+/*
+ * destroy a call
+ */
+static void rxrpc_destroy_call(struct work_struct *work)
+{
+ struct rxrpc_call *call =
+ container_of(work, struct rxrpc_call, destroyer);
+
+ _enter("%p{%d,%d,%p}",
+ call, atomic_read(&call->usage), call->channel, call->conn);
+
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_del_init(&call->link);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ rxrpc_cleanup_call(call);
+ _leave("");
+}
+
+/*
+ * preemptively destroy all the call records from a transport endpoint rather
+ * than waiting for them to time out
+ */
+void __exit rxrpc_destroy_all_calls(void)
+{
+ struct rxrpc_call *call;
+
+ _enter("");
+ write_lock_bh(&rxrpc_call_lock);
+
+ while (!list_empty(&rxrpc_calls)) {
+ call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
+ _debug("Zapping call %p", call);
+
+ list_del_init(&call->link);
+
+ switch (atomic_read(&call->usage)) {
+ case 0:
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+ break;
+ case 1:
+ if (del_timer_sync(&call->deadspan) != 0 &&
+ call->state != RXRPC_CALL_DEAD)
+ rxrpc_dead_call_expired((unsigned long) call);
+ if (call->state != RXRPC_CALL_DEAD)
+ break;
+ default:
+ printk(KERN_ERR "RXRPC:"
+ " Call %p still in use (%d,%d,%s,%lx,%lx)!\n",
+ call, atomic_read(&call->usage),
+ atomic_read(&call->ackr_not_idle),
+ rxrpc_call_states[call->state],
+ call->flags, call->events);
+ if (!skb_queue_empty(&call->rx_queue))
+ printk(KERN_ERR"RXRPC: Rx queue occupied\n");
+ if (!skb_queue_empty(&call->rx_oos_queue))
+ printk(KERN_ERR"RXRPC: OOS queue occupied\n");
+ break;
+ }
+
+ write_unlock_bh(&rxrpc_call_lock);
+ cond_resched();
+ write_lock_bh(&rxrpc_call_lock);
+ }
+
+ write_unlock_bh(&rxrpc_call_lock);
+ _leave("");
+}
+
+/*
+ * handle call lifetime being exceeded
+ */
+static void rxrpc_call_life_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ _enter("{%d}", call->debug_id);
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ set_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
+ rxrpc_queue_call(call);
+ }
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * handle resend timer expiry
+ * - may not take call->state_lock as this can deadlock against del_timer_sync()
+ */
+static void rxrpc_resend_time_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ if (!test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
+ rxrpc_queue_call(call);
+}
+
+/*
+ * handle ACK timer expiry
+ */
+static void rxrpc_ack_time_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_ACK, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock_bh(&call->state_lock);
+}
diff --git a/net/rxrpc/ar-connection.c b/net/rxrpc/ar-connection.c
new file mode 100644
index 000000000..6631f4f1e
--- /dev/null
+++ b/net/rxrpc/ar-connection.c
@@ -0,0 +1,928 @@
+/* RxRPC virtual connection handler
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/crypto.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * Time till a connection expires after last use (in seconds).
+ */
+unsigned rxrpc_connection_expiry = 10 * 60;
+
+static void rxrpc_connection_reaper(struct work_struct *work);
+
+LIST_HEAD(rxrpc_connections);
+DEFINE_RWLOCK(rxrpc_connection_lock);
+static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper);
+
+/*
+ * allocate a new client connection bundle
+ */
+static struct rxrpc_conn_bundle *rxrpc_alloc_bundle(gfp_t gfp)
+{
+ struct rxrpc_conn_bundle *bundle;
+
+ _enter("");
+
+ bundle = kzalloc(sizeof(struct rxrpc_conn_bundle), gfp);
+ if (bundle) {
+ INIT_LIST_HEAD(&bundle->unused_conns);
+ INIT_LIST_HEAD(&bundle->avail_conns);
+ INIT_LIST_HEAD(&bundle->busy_conns);
+ init_waitqueue_head(&bundle->chanwait);
+ atomic_set(&bundle->usage, 1);
+ }
+
+ _leave(" = %p", bundle);
+ return bundle;
+}
+
+/*
+ * compare bundle parameters with what we're looking for
+ * - return -ve, 0 or +ve
+ */
+static inline
+int rxrpc_cmp_bundle(const struct rxrpc_conn_bundle *bundle,
+ struct key *key, __be16 service_id)
+{
+ return (bundle->service_id - service_id) ?:
+ ((unsigned long) bundle->key - (unsigned long) key);
+}
+
+/*
+ * get bundle of client connections that a client socket can make use of
+ */
+struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *rx,
+ struct rxrpc_transport *trans,
+ struct key *key,
+ __be16 service_id,
+ gfp_t gfp)
+{
+ struct rxrpc_conn_bundle *bundle, *candidate;
+ struct rb_node *p, *parent, **pp;
+
+ _enter("%p{%x},%x,%hx,",
+ rx, key_serial(key), trans->debug_id, ntohs(service_id));
+
+ if (rx->trans == trans && rx->bundle) {
+ atomic_inc(&rx->bundle->usage);
+ return rx->bundle;
+ }
+
+ /* search the extant bundles first for one that matches the specified
+ * user ID */
+ spin_lock(&trans->client_lock);
+
+ p = trans->bundles.rb_node;
+ while (p) {
+ bundle = rb_entry(p, struct rxrpc_conn_bundle, node);
+
+ if (rxrpc_cmp_bundle(bundle, key, service_id) < 0)
+ p = p->rb_left;
+ else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0)
+ p = p->rb_right;
+ else
+ goto found_extant_bundle;
+ }
+
+ spin_unlock(&trans->client_lock);
+
+ /* not yet present - create a candidate for a new record and then
+ * redo the search */
+ candidate = rxrpc_alloc_bundle(gfp);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ candidate->key = key_get(key);
+ candidate->service_id = service_id;
+
+ spin_lock(&trans->client_lock);
+
+ pp = &trans->bundles.rb_node;
+ parent = NULL;
+ while (*pp) {
+ parent = *pp;
+ bundle = rb_entry(parent, struct rxrpc_conn_bundle, node);
+
+ if (rxrpc_cmp_bundle(bundle, key, service_id) < 0)
+ pp = &(*pp)->rb_left;
+ else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0)
+ pp = &(*pp)->rb_right;
+ else
+ goto found_extant_second;
+ }
+
+ /* second search also failed; add the new bundle */
+ bundle = candidate;
+ candidate = NULL;
+
+ rb_link_node(&bundle->node, parent, pp);
+ rb_insert_color(&bundle->node, &trans->bundles);
+ spin_unlock(&trans->client_lock);
+ _net("BUNDLE new on trans %d", trans->debug_id);
+ if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
+ atomic_inc(&bundle->usage);
+ rx->bundle = bundle;
+ }
+ _leave(" = %p [new]", bundle);
+ return bundle;
+
+ /* we found the bundle in the list immediately */
+found_extant_bundle:
+ atomic_inc(&bundle->usage);
+ spin_unlock(&trans->client_lock);
+ _net("BUNDLE old on trans %d", trans->debug_id);
+ if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
+ atomic_inc(&bundle->usage);
+ rx->bundle = bundle;
+ }
+ _leave(" = %p [extant %d]", bundle, atomic_read(&bundle->usage));
+ return bundle;
+
+ /* we found the bundle on the second time through the list */
+found_extant_second:
+ atomic_inc(&bundle->usage);
+ spin_unlock(&trans->client_lock);
+ kfree(candidate);
+ _net("BUNDLE old2 on trans %d", trans->debug_id);
+ if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
+ atomic_inc(&bundle->usage);
+ rx->bundle = bundle;
+ }
+ _leave(" = %p [second %d]", bundle, atomic_read(&bundle->usage));
+ return bundle;
+}
+
+/*
+ * release a bundle
+ */
+void rxrpc_put_bundle(struct rxrpc_transport *trans,
+ struct rxrpc_conn_bundle *bundle)
+{
+ _enter("%p,%p{%d}",trans, bundle, atomic_read(&bundle->usage));
+
+ if (atomic_dec_and_lock(&bundle->usage, &trans->client_lock)) {
+ _debug("Destroy bundle");
+ rb_erase(&bundle->node, &trans->bundles);
+ spin_unlock(&trans->client_lock);
+ ASSERT(list_empty(&bundle->unused_conns));
+ ASSERT(list_empty(&bundle->avail_conns));
+ ASSERT(list_empty(&bundle->busy_conns));
+ ASSERTCMP(bundle->num_conns, ==, 0);
+ key_put(bundle->key);
+ kfree(bundle);
+ }
+
+ _leave("");
+}
+
+/*
+ * allocate a new connection
+ */
+static struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
+{
+ struct rxrpc_connection *conn;
+
+ _enter("");
+
+ conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
+ if (conn) {
+ INIT_WORK(&conn->processor, &rxrpc_process_connection);
+ INIT_LIST_HEAD(&conn->bundle_link);
+ conn->calls = RB_ROOT;
+ skb_queue_head_init(&conn->rx_queue);
+ rwlock_init(&conn->lock);
+ spin_lock_init(&conn->state_lock);
+ atomic_set(&conn->usage, 1);
+ conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ conn->avail_calls = RXRPC_MAXCALLS;
+ conn->size_align = 4;
+ conn->header_size = sizeof(struct rxrpc_header);
+ }
+
+ _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0);
+ return conn;
+}
+
+/*
+ * assign a connection ID to a connection and add it to the transport's
+ * connection lookup tree
+ * - called with transport client lock held
+ */
+static void rxrpc_assign_connection_id(struct rxrpc_connection *conn)
+{
+ struct rxrpc_connection *xconn;
+ struct rb_node *parent, **p;
+ __be32 epoch;
+ u32 real_conn_id;
+
+ _enter("");
+
+ epoch = conn->epoch;
+
+ write_lock_bh(&conn->trans->conn_lock);
+
+ conn->trans->conn_idcounter += RXRPC_CID_INC;
+ if (conn->trans->conn_idcounter < RXRPC_CID_INC)
+ conn->trans->conn_idcounter = RXRPC_CID_INC;
+ real_conn_id = conn->trans->conn_idcounter;
+
+attempt_insertion:
+ parent = NULL;
+ p = &conn->trans->client_conns.rb_node;
+
+ while (*p) {
+ parent = *p;
+ xconn = rb_entry(parent, struct rxrpc_connection, node);
+
+ if (epoch < xconn->epoch)
+ p = &(*p)->rb_left;
+ else if (epoch > xconn->epoch)
+ p = &(*p)->rb_right;
+ else if (real_conn_id < xconn->real_conn_id)
+ p = &(*p)->rb_left;
+ else if (real_conn_id > xconn->real_conn_id)
+ p = &(*p)->rb_right;
+ else
+ goto id_exists;
+ }
+
+ /* we've found a suitable hole - arrange for this connection to occupy
+ * it */
+ rb_link_node(&conn->node, parent, p);
+ rb_insert_color(&conn->node, &conn->trans->client_conns);
+
+ conn->real_conn_id = real_conn_id;
+ conn->cid = htonl(real_conn_id);
+ write_unlock_bh(&conn->trans->conn_lock);
+ _leave(" [CONNID %x CID %x]", real_conn_id, ntohl(conn->cid));
+ return;
+
+ /* we found a connection with the proposed ID - walk the tree from that
+ * point looking for the next unused ID */
+id_exists:
+ for (;;) {
+ real_conn_id += RXRPC_CID_INC;
+ if (real_conn_id < RXRPC_CID_INC) {
+ real_conn_id = RXRPC_CID_INC;
+ conn->trans->conn_idcounter = real_conn_id;
+ goto attempt_insertion;
+ }
+
+ parent = rb_next(parent);
+ if (!parent)
+ goto attempt_insertion;
+
+ xconn = rb_entry(parent, struct rxrpc_connection, node);
+ if (epoch < xconn->epoch ||
+ real_conn_id < xconn->real_conn_id)
+ goto attempt_insertion;
+ }
+}
+
+/*
+ * add a call to a connection's call-by-ID tree
+ */
+static void rxrpc_add_call_ID_to_conn(struct rxrpc_connection *conn,
+ struct rxrpc_call *call)
+{
+ struct rxrpc_call *xcall;
+ struct rb_node *parent, **p;
+ __be32 call_id;
+
+ write_lock_bh(&conn->lock);
+
+ call_id = call->call_id;
+ p = &conn->calls.rb_node;
+ parent = NULL;
+ while (*p) {
+ parent = *p;
+ xcall = rb_entry(parent, struct rxrpc_call, conn_node);
+
+ if (call_id < xcall->call_id)
+ p = &(*p)->rb_left;
+ else if (call_id > xcall->call_id)
+ p = &(*p)->rb_right;
+ else
+ BUG();
+ }
+
+ rb_link_node(&call->conn_node, parent, p);
+ rb_insert_color(&call->conn_node, &conn->calls);
+
+ write_unlock_bh(&conn->lock);
+}
+
+/*
+ * connect a call on an exclusive connection
+ */
+static int rxrpc_connect_exclusive(struct rxrpc_sock *rx,
+ struct rxrpc_transport *trans,
+ __be16 service_id,
+ struct rxrpc_call *call,
+ gfp_t gfp)
+{
+ struct rxrpc_connection *conn;
+ int chan, ret;
+
+ _enter("");
+
+ conn = rx->conn;
+ if (!conn) {
+ /* not yet present - create a candidate for a new connection
+ * and then redo the check */
+ conn = rxrpc_alloc_connection(gfp);
+ if (!conn) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ conn->trans = trans;
+ conn->bundle = NULL;
+ conn->service_id = service_id;
+ conn->epoch = rxrpc_epoch;
+ conn->in_clientflag = 0;
+ conn->out_clientflag = RXRPC_CLIENT_INITIATED;
+ conn->cid = 0;
+ conn->state = RXRPC_CONN_CLIENT;
+ conn->avail_calls = RXRPC_MAXCALLS - 1;
+ conn->security_level = rx->min_sec_level;
+ conn->key = key_get(rx->key);
+
+ ret = rxrpc_init_client_conn_security(conn);
+ if (ret < 0) {
+ key_put(conn->key);
+ kfree(conn);
+ _leave(" = %d [key]", ret);
+ return ret;
+ }
+
+ write_lock_bh(&rxrpc_connection_lock);
+ list_add_tail(&conn->link, &rxrpc_connections);
+ write_unlock_bh(&rxrpc_connection_lock);
+
+ spin_lock(&trans->client_lock);
+ atomic_inc(&trans->usage);
+
+ _net("CONNECT EXCL new %d on TRANS %d",
+ conn->debug_id, conn->trans->debug_id);
+
+ rxrpc_assign_connection_id(conn);
+ rx->conn = conn;
+ } else {
+ spin_lock(&trans->client_lock);
+ }
+
+ /* we've got a connection with a free channel and we can now attach the
+ * call to it
+ * - we're holding the transport's client lock
+ * - we're holding a reference on the connection
+ */
+ for (chan = 0; chan < RXRPC_MAXCALLS; chan++)
+ if (!conn->channels[chan])
+ goto found_channel;
+ goto no_free_channels;
+
+found_channel:
+ atomic_inc(&conn->usage);
+ conn->channels[chan] = call;
+ call->conn = conn;
+ call->channel = chan;
+ call->cid = conn->cid | htonl(chan);
+ call->call_id = htonl(++conn->call_counter);
+
+ _net("CONNECT client on conn %d chan %d as call %x",
+ conn->debug_id, chan, ntohl(call->call_id));
+
+ spin_unlock(&trans->client_lock);
+
+ rxrpc_add_call_ID_to_conn(conn, call);
+ _leave(" = 0");
+ return 0;
+
+no_free_channels:
+ spin_unlock(&trans->client_lock);
+ _leave(" = -ENOSR");
+ return -ENOSR;
+}
+
+/*
+ * find a connection for a call
+ * - called in process context with IRQs enabled
+ */
+int rxrpc_connect_call(struct rxrpc_sock *rx,
+ struct rxrpc_transport *trans,
+ struct rxrpc_conn_bundle *bundle,
+ struct rxrpc_call *call,
+ gfp_t gfp)
+{
+ struct rxrpc_connection *conn, *candidate;
+ int chan, ret;
+
+ DECLARE_WAITQUEUE(myself, current);
+
+ _enter("%p,%lx,", rx, call->user_call_ID);
+
+ if (test_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags))
+ return rxrpc_connect_exclusive(rx, trans, bundle->service_id,
+ call, gfp);
+
+ spin_lock(&trans->client_lock);
+ for (;;) {
+ /* see if the bundle has a call slot available */
+ if (!list_empty(&bundle->avail_conns)) {
+ _debug("avail");
+ conn = list_entry(bundle->avail_conns.next,
+ struct rxrpc_connection,
+ bundle_link);
+ if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
+ list_del_init(&conn->bundle_link);
+ bundle->num_conns--;
+ continue;
+ }
+ if (--conn->avail_calls == 0)
+ list_move(&conn->bundle_link,
+ &bundle->busy_conns);
+ ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS);
+ ASSERT(conn->channels[0] == NULL ||
+ conn->channels[1] == NULL ||
+ conn->channels[2] == NULL ||
+ conn->channels[3] == NULL);
+ atomic_inc(&conn->usage);
+ break;
+ }
+
+ if (!list_empty(&bundle->unused_conns)) {
+ _debug("unused");
+ conn = list_entry(bundle->unused_conns.next,
+ struct rxrpc_connection,
+ bundle_link);
+ if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
+ list_del_init(&conn->bundle_link);
+ bundle->num_conns--;
+ continue;
+ }
+ ASSERTCMP(conn->avail_calls, ==, RXRPC_MAXCALLS);
+ conn->avail_calls = RXRPC_MAXCALLS - 1;
+ ASSERT(conn->channels[0] == NULL &&
+ conn->channels[1] == NULL &&
+ conn->channels[2] == NULL &&
+ conn->channels[3] == NULL);
+ atomic_inc(&conn->usage);
+ list_move(&conn->bundle_link, &bundle->avail_conns);
+ break;
+ }
+
+ /* need to allocate a new connection */
+ _debug("get new conn [%d]", bundle->num_conns);
+
+ spin_unlock(&trans->client_lock);
+
+ if (signal_pending(current))
+ goto interrupted;
+
+ if (bundle->num_conns >= 20) {
+ _debug("too many conns");
+
+ if (!(gfp & __GFP_WAIT)) {
+ _leave(" = -EAGAIN");
+ return -EAGAIN;
+ }
+
+ add_wait_queue(&bundle->chanwait, &myself);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (bundle->num_conns < 20 ||
+ !list_empty(&bundle->unused_conns) ||
+ !list_empty(&bundle->avail_conns))
+ break;
+ if (signal_pending(current))
+ goto interrupted_dequeue;
+ schedule();
+ }
+ remove_wait_queue(&bundle->chanwait, &myself);
+ __set_current_state(TASK_RUNNING);
+ spin_lock(&trans->client_lock);
+ continue;
+ }
+
+ /* not yet present - create a candidate for a new connection and then
+ * redo the check */
+ candidate = rxrpc_alloc_connection(gfp);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+ }
+
+ candidate->trans = trans;
+ candidate->bundle = bundle;
+ candidate->service_id = bundle->service_id;
+ candidate->epoch = rxrpc_epoch;
+ candidate->in_clientflag = 0;
+ candidate->out_clientflag = RXRPC_CLIENT_INITIATED;
+ candidate->cid = 0;
+ candidate->state = RXRPC_CONN_CLIENT;
+ candidate->avail_calls = RXRPC_MAXCALLS;
+ candidate->security_level = rx->min_sec_level;
+ candidate->key = key_get(bundle->key);
+
+ ret = rxrpc_init_client_conn_security(candidate);
+ if (ret < 0) {
+ key_put(candidate->key);
+ kfree(candidate);
+ _leave(" = %d [key]", ret);
+ return ret;
+ }
+
+ write_lock_bh(&rxrpc_connection_lock);
+ list_add_tail(&candidate->link, &rxrpc_connections);
+ write_unlock_bh(&rxrpc_connection_lock);
+
+ spin_lock(&trans->client_lock);
+
+ list_add(&candidate->bundle_link, &bundle->unused_conns);
+ bundle->num_conns++;
+ atomic_inc(&bundle->usage);
+ atomic_inc(&trans->usage);
+
+ _net("CONNECT new %d on TRANS %d",
+ candidate->debug_id, candidate->trans->debug_id);
+
+ rxrpc_assign_connection_id(candidate);
+ if (candidate->security)
+ candidate->security->prime_packet_security(candidate);
+
+ /* leave the candidate lurking in zombie mode attached to the
+ * bundle until we're ready for it */
+ rxrpc_put_connection(candidate);
+ candidate = NULL;
+ }
+
+ /* we've got a connection with a free channel and we can now attach the
+ * call to it
+ * - we're holding the transport's client lock
+ * - we're holding a reference on the connection
+ * - we're holding a reference on the bundle
+ */
+ for (chan = 0; chan < RXRPC_MAXCALLS; chan++)
+ if (!conn->channels[chan])
+ goto found_channel;
+ ASSERT(conn->channels[0] == NULL ||
+ conn->channels[1] == NULL ||
+ conn->channels[2] == NULL ||
+ conn->channels[3] == NULL);
+ BUG();
+
+found_channel:
+ conn->channels[chan] = call;
+ call->conn = conn;
+ call->channel = chan;
+ call->cid = conn->cid | htonl(chan);
+ call->call_id = htonl(++conn->call_counter);
+
+ _net("CONNECT client on conn %d chan %d as call %x",
+ conn->debug_id, chan, ntohl(call->call_id));
+
+ ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS);
+ spin_unlock(&trans->client_lock);
+
+ rxrpc_add_call_ID_to_conn(conn, call);
+
+ _leave(" = 0");
+ return 0;
+
+interrupted_dequeue:
+ remove_wait_queue(&bundle->chanwait, &myself);
+ __set_current_state(TASK_RUNNING);
+interrupted:
+ _leave(" = -ERESTARTSYS");
+ return -ERESTARTSYS;
+}
+
+/*
+ * get a record of an incoming connection
+ */
+struct rxrpc_connection *
+rxrpc_incoming_connection(struct rxrpc_transport *trans,
+ struct rxrpc_header *hdr,
+ gfp_t gfp)
+{
+ struct rxrpc_connection *conn, *candidate = NULL;
+ struct rb_node *p, **pp;
+ const char *new = "old";
+ __be32 epoch;
+ u32 conn_id;
+
+ _enter("");
+
+ ASSERT(hdr->flags & RXRPC_CLIENT_INITIATED);
+
+ epoch = hdr->epoch;
+ conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK;
+
+ /* search the connection list first */
+ read_lock_bh(&trans->conn_lock);
+
+ p = trans->server_conns.rb_node;
+ while (p) {
+ conn = rb_entry(p, struct rxrpc_connection, node);
+
+ _debug("maybe %x", conn->real_conn_id);
+
+ if (epoch < conn->epoch)
+ p = p->rb_left;
+ else if (epoch > conn->epoch)
+ p = p->rb_right;
+ else if (conn_id < conn->real_conn_id)
+ p = p->rb_left;
+ else if (conn_id > conn->real_conn_id)
+ p = p->rb_right;
+ else
+ goto found_extant_connection;
+ }
+ read_unlock_bh(&trans->conn_lock);
+
+ /* not yet present - create a candidate for a new record and then
+ * redo the search */
+ candidate = rxrpc_alloc_connection(gfp);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ candidate->trans = trans;
+ candidate->epoch = hdr->epoch;
+ candidate->cid = hdr->cid & cpu_to_be32(RXRPC_CIDMASK);
+ candidate->service_id = hdr->serviceId;
+ candidate->security_ix = hdr->securityIndex;
+ candidate->in_clientflag = RXRPC_CLIENT_INITIATED;
+ candidate->out_clientflag = 0;
+ candidate->real_conn_id = conn_id;
+ candidate->state = RXRPC_CONN_SERVER;
+ if (candidate->service_id)
+ candidate->state = RXRPC_CONN_SERVER_UNSECURED;
+
+ write_lock_bh(&trans->conn_lock);
+
+ pp = &trans->server_conns.rb_node;
+ p = NULL;
+ while (*pp) {
+ p = *pp;
+ conn = rb_entry(p, struct rxrpc_connection, node);
+
+ if (epoch < conn->epoch)
+ pp = &(*pp)->rb_left;
+ else if (epoch > conn->epoch)
+ pp = &(*pp)->rb_right;
+ else if (conn_id < conn->real_conn_id)
+ pp = &(*pp)->rb_left;
+ else if (conn_id > conn->real_conn_id)
+ pp = &(*pp)->rb_right;
+ else
+ goto found_extant_second;
+ }
+
+ /* we can now add the new candidate to the list */
+ conn = candidate;
+ candidate = NULL;
+ rb_link_node(&conn->node, p, pp);
+ rb_insert_color(&conn->node, &trans->server_conns);
+ atomic_inc(&conn->trans->usage);
+
+ write_unlock_bh(&trans->conn_lock);
+
+ write_lock_bh(&rxrpc_connection_lock);
+ list_add_tail(&conn->link, &rxrpc_connections);
+ write_unlock_bh(&rxrpc_connection_lock);
+
+ new = "new";
+
+success:
+ _net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->real_conn_id);
+
+ _leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
+ return conn;
+
+ /* we found the connection in the list immediately */
+found_extant_connection:
+ if (hdr->securityIndex != conn->security_ix) {
+ read_unlock_bh(&trans->conn_lock);
+ goto security_mismatch;
+ }
+ atomic_inc(&conn->usage);
+ read_unlock_bh(&trans->conn_lock);
+ goto success;
+
+ /* we found the connection on the second time through the list */
+found_extant_second:
+ if (hdr->securityIndex != conn->security_ix) {
+ write_unlock_bh(&trans->conn_lock);
+ goto security_mismatch;
+ }
+ atomic_inc(&conn->usage);
+ write_unlock_bh(&trans->conn_lock);
+ kfree(candidate);
+ goto success;
+
+security_mismatch:
+ kfree(candidate);
+ _leave(" = -EKEYREJECTED");
+ return ERR_PTR(-EKEYREJECTED);
+}
+
+/*
+ * find a connection based on transport and RxRPC connection ID for an incoming
+ * packet
+ */
+struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans,
+ struct rxrpc_header *hdr)
+{
+ struct rxrpc_connection *conn;
+ struct rb_node *p;
+ __be32 epoch;
+ u32 conn_id;
+
+ _enter(",{%x,%x}", ntohl(hdr->cid), hdr->flags);
+
+ read_lock_bh(&trans->conn_lock);
+
+ conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK;
+ epoch = hdr->epoch;
+
+ if (hdr->flags & RXRPC_CLIENT_INITIATED)
+ p = trans->server_conns.rb_node;
+ else
+ p = trans->client_conns.rb_node;
+
+ while (p) {
+ conn = rb_entry(p, struct rxrpc_connection, node);
+
+ _debug("maybe %x", conn->real_conn_id);
+
+ if (epoch < conn->epoch)
+ p = p->rb_left;
+ else if (epoch > conn->epoch)
+ p = p->rb_right;
+ else if (conn_id < conn->real_conn_id)
+ p = p->rb_left;
+ else if (conn_id > conn->real_conn_id)
+ p = p->rb_right;
+ else
+ goto found;
+ }
+
+ read_unlock_bh(&trans->conn_lock);
+ _leave(" = NULL");
+ return NULL;
+
+found:
+ atomic_inc(&conn->usage);
+ read_unlock_bh(&trans->conn_lock);
+ _leave(" = %p", conn);
+ return conn;
+}
+
+/*
+ * release a virtual connection
+ */
+void rxrpc_put_connection(struct rxrpc_connection *conn)
+{
+ _enter("%p{u=%d,d=%d}",
+ conn, atomic_read(&conn->usage), conn->debug_id);
+
+ ASSERTCMP(atomic_read(&conn->usage), >, 0);
+
+ conn->put_time = get_seconds();
+ if (atomic_dec_and_test(&conn->usage)) {
+ _debug("zombie");
+ rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
+ }
+
+ _leave("");
+}
+
+/*
+ * destroy a virtual connection
+ */
+static void rxrpc_destroy_connection(struct rxrpc_connection *conn)
+{
+ _enter("%p{%d}", conn, atomic_read(&conn->usage));
+
+ ASSERTCMP(atomic_read(&conn->usage), ==, 0);
+
+ _net("DESTROY CONN %d", conn->debug_id);
+
+ if (conn->bundle)
+ rxrpc_put_bundle(conn->trans, conn->bundle);
+
+ ASSERT(RB_EMPTY_ROOT(&conn->calls));
+ rxrpc_purge_queue(&conn->rx_queue);
+
+ rxrpc_clear_conn_security(conn);
+ rxrpc_put_transport(conn->trans);
+ kfree(conn);
+ _leave("");
+}
+
+/*
+ * reap dead connections
+ */
+static void rxrpc_connection_reaper(struct work_struct *work)
+{
+ struct rxrpc_connection *conn, *_p;
+ unsigned long now, earliest, reap_time;
+
+ LIST_HEAD(graveyard);
+
+ _enter("");
+
+ now = get_seconds();
+ earliest = ULONG_MAX;
+
+ write_lock_bh(&rxrpc_connection_lock);
+ list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) {
+ _debug("reap CONN %d { u=%d,t=%ld }",
+ conn->debug_id, atomic_read(&conn->usage),
+ (long) now - (long) conn->put_time);
+
+ if (likely(atomic_read(&conn->usage) > 0))
+ continue;
+
+ spin_lock(&conn->trans->client_lock);
+ write_lock(&conn->trans->conn_lock);
+ reap_time = conn->put_time + rxrpc_connection_expiry;
+
+ if (atomic_read(&conn->usage) > 0) {
+ ;
+ } else if (reap_time <= now) {
+ list_move_tail(&conn->link, &graveyard);
+ if (conn->out_clientflag)
+ rb_erase(&conn->node,
+ &conn->trans->client_conns);
+ else
+ rb_erase(&conn->node,
+ &conn->trans->server_conns);
+ if (conn->bundle) {
+ list_del_init(&conn->bundle_link);
+ conn->bundle->num_conns--;
+ }
+
+ } else if (reap_time < earliest) {
+ earliest = reap_time;
+ }
+
+ write_unlock(&conn->trans->conn_lock);
+ spin_unlock(&conn->trans->client_lock);
+ }
+ write_unlock_bh(&rxrpc_connection_lock);
+
+ if (earliest != ULONG_MAX) {
+ _debug("reschedule reaper %ld", (long) earliest - now);
+ ASSERTCMP(earliest, >, now);
+ rxrpc_queue_delayed_work(&rxrpc_connection_reap,
+ (earliest - now) * HZ);
+ }
+
+ /* then destroy all those pulled out */
+ while (!list_empty(&graveyard)) {
+ conn = list_entry(graveyard.next, struct rxrpc_connection,
+ link);
+ list_del_init(&conn->link);
+
+ ASSERTCMP(atomic_read(&conn->usage), ==, 0);
+ rxrpc_destroy_connection(conn);
+ }
+
+ _leave("");
+}
+
+/*
+ * preemptively destroy all the connection records rather than waiting for them
+ * to time out
+ */
+void __exit rxrpc_destroy_all_connections(void)
+{
+ _enter("");
+
+ rxrpc_connection_expiry = 0;
+ cancel_delayed_work(&rxrpc_connection_reap);
+ rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
+
+ _leave("");
+}
diff --git a/net/rxrpc/ar-connevent.c b/net/rxrpc/ar-connevent.c
new file mode 100644
index 000000000..e7ed43a54
--- /dev/null
+++ b/net/rxrpc/ar-connevent.c
@@ -0,0 +1,405 @@
+/* connection-level event handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * pass a connection-level abort onto all calls on that connection
+ */
+static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
+ u32 abort_code)
+{
+ struct rxrpc_call *call;
+ struct rb_node *p;
+
+ _enter("{%d},%x", conn->debug_id, abort_code);
+
+ read_lock_bh(&conn->lock);
+
+ for (p = rb_first(&conn->calls); p; p = rb_next(p)) {
+ call = rb_entry(p, struct rxrpc_call, conn_node);
+ write_lock(&call->state_lock);
+ if (call->state <= RXRPC_CALL_COMPLETE) {
+ call->state = state;
+ call->abort_code = abort_code;
+ if (state == RXRPC_CALL_LOCALLY_ABORTED)
+ set_bit(RXRPC_CALL_CONN_ABORT, &call->events);
+ else
+ set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+ rxrpc_queue_call(call);
+ }
+ write_unlock(&call->state_lock);
+ }
+
+ read_unlock_bh(&conn->lock);
+ _leave("");
+}
+
+/*
+ * generate a connection-level abort
+ */
+static int rxrpc_abort_connection(struct rxrpc_connection *conn,
+ u32 error, u32 abort_code)
+{
+ struct rxrpc_header hdr;
+ struct msghdr msg;
+ struct kvec iov[2];
+ __be32 word;
+ size_t len;
+ int ret;
+
+ _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
+
+ /* generate a connection-level abort */
+ spin_lock_bh(&conn->state_lock);
+ if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) {
+ conn->state = RXRPC_CONN_LOCALLY_ABORTED;
+ conn->error = error;
+ spin_unlock_bh(&conn->state_lock);
+ } else {
+ spin_unlock_bh(&conn->state_lock);
+ _leave(" = 0 [already dead]");
+ return 0;
+ }
+
+ rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
+
+ msg.msg_name = &conn->trans->peer->srx.transport.sin;
+ msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ hdr.epoch = conn->epoch;
+ hdr.cid = conn->cid;
+ hdr.callNumber = 0;
+ hdr.seq = 0;
+ hdr.type = RXRPC_PACKET_TYPE_ABORT;
+ hdr.flags = conn->out_clientflag;
+ hdr.userStatus = 0;
+ hdr.securityIndex = conn->security_ix;
+ hdr._rsvd = 0;
+ hdr.serviceId = conn->service_id;
+
+ word = htonl(abort_code);
+
+ iov[0].iov_base = &hdr;
+ iov[0].iov_len = sizeof(hdr);
+ iov[1].iov_base = &word;
+ iov[1].iov_len = sizeof(word);
+
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ hdr.serial = htonl(atomic_inc_return(&conn->serial));
+ _proto("Tx CONN ABORT %%%u { %d }", ntohl(hdr.serial), abort_code);
+
+ ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len);
+ if (ret < 0) {
+ _debug("sendmsg failed: %d", ret);
+ return -EAGAIN;
+ }
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * mark a call as being on a now-secured channel
+ * - must be called with softirqs disabled
+ */
+static void rxrpc_call_is_secure(struct rxrpc_call *call)
+{
+ _enter("%p", call);
+ if (call) {
+ read_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_SECURED, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock(&call->state_lock);
+ }
+}
+
+/*
+ * connection-level Rx packet processor
+ */
+static int rxrpc_process_event(struct rxrpc_connection *conn,
+ struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ __be32 tmp;
+ u32 serial;
+ int loop, ret;
+
+ if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
+ kleave(" = -ECONNABORTED [%u]", conn->state);
+ return -ECONNABORTED;
+ }
+
+ serial = ntohl(sp->hdr.serial);
+
+ _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, serial);
+
+ switch (sp->hdr.type) {
+ case RXRPC_PACKET_TYPE_ABORT:
+ if (skb_copy_bits(skb, 0, &tmp, sizeof(tmp)) < 0)
+ return -EPROTO;
+ _proto("Rx ABORT %%%u { ac=%d }", serial, ntohl(tmp));
+
+ conn->state = RXRPC_CONN_REMOTELY_ABORTED;
+ rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
+ ntohl(tmp));
+ return -ECONNABORTED;
+
+ case RXRPC_PACKET_TYPE_CHALLENGE:
+ if (conn->security)
+ return conn->security->respond_to_challenge(
+ conn, skb, _abort_code);
+ return -EPROTO;
+
+ case RXRPC_PACKET_TYPE_RESPONSE:
+ if (!conn->security)
+ return -EPROTO;
+
+ ret = conn->security->verify_response(conn, skb, _abort_code);
+ if (ret < 0)
+ return ret;
+
+ ret = conn->security->init_connection_security(conn);
+ if (ret < 0)
+ return ret;
+
+ conn->security->prime_packet_security(conn);
+ read_lock_bh(&conn->lock);
+ spin_lock(&conn->state_lock);
+
+ if (conn->state == RXRPC_CONN_SERVER_CHALLENGING) {
+ conn->state = RXRPC_CONN_SERVER;
+ for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
+ rxrpc_call_is_secure(conn->channels[loop]);
+ }
+
+ spin_unlock(&conn->state_lock);
+ read_unlock_bh(&conn->lock);
+ return 0;
+
+ default:
+ _leave(" = -EPROTO [%u]", sp->hdr.type);
+ return -EPROTO;
+ }
+}
+
+/*
+ * set up security and issue a challenge
+ */
+static void rxrpc_secure_connection(struct rxrpc_connection *conn)
+{
+ u32 abort_code;
+ int ret;
+
+ _enter("{%d}", conn->debug_id);
+
+ ASSERT(conn->security_ix != 0);
+
+ if (!conn->key) {
+ _debug("set up security");
+ ret = rxrpc_init_server_conn_security(conn);
+ switch (ret) {
+ case 0:
+ break;
+ case -ENOENT:
+ abort_code = RX_CALL_DEAD;
+ goto abort;
+ default:
+ abort_code = RXKADNOAUTH;
+ goto abort;
+ }
+ }
+
+ ASSERT(conn->security != NULL);
+
+ if (conn->security->issue_challenge(conn) < 0) {
+ abort_code = RX_CALL_DEAD;
+ ret = -ENOMEM;
+ goto abort;
+ }
+
+ _leave("");
+ return;
+
+abort:
+ _debug("abort %d, %d", ret, abort_code);
+ rxrpc_abort_connection(conn, -ret, abort_code);
+ _leave(" [aborted]");
+}
+
+/*
+ * connection-level event processor
+ */
+void rxrpc_process_connection(struct work_struct *work)
+{
+ struct rxrpc_connection *conn =
+ container_of(work, struct rxrpc_connection, processor);
+ struct sk_buff *skb;
+ u32 abort_code = RX_PROTOCOL_ERROR;
+ int ret;
+
+ _enter("{%d}", conn->debug_id);
+
+ atomic_inc(&conn->usage);
+
+ if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) {
+ rxrpc_secure_connection(conn);
+ rxrpc_put_connection(conn);
+ }
+
+ /* go through the conn-level event packets, releasing the ref on this
+ * connection that each one has when we've finished with it */
+ while ((skb = skb_dequeue(&conn->rx_queue))) {
+ ret = rxrpc_process_event(conn, skb, &abort_code);
+ switch (ret) {
+ case -EPROTO:
+ case -EKEYEXPIRED:
+ case -EKEYREJECTED:
+ goto protocol_error;
+ case -EAGAIN:
+ goto requeue_and_leave;
+ case -ECONNABORTED:
+ default:
+ rxrpc_put_connection(conn);
+ rxrpc_free_skb(skb);
+ break;
+ }
+ }
+
+out:
+ rxrpc_put_connection(conn);
+ _leave("");
+ return;
+
+requeue_and_leave:
+ skb_queue_head(&conn->rx_queue, skb);
+ goto out;
+
+protocol_error:
+ if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
+ goto requeue_and_leave;
+ rxrpc_put_connection(conn);
+ rxrpc_free_skb(skb);
+ _leave(" [EPROTO]");
+ goto out;
+}
+
+/*
+ * put a packet up for transport-level abort
+ */
+void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
+{
+ CHECK_SLAB_OKAY(&local->usage);
+
+ if (!atomic_inc_not_zero(&local->usage)) {
+ printk("resurrected on reject\n");
+ BUG();
+ }
+
+ skb_queue_tail(&local->reject_queue, skb);
+ rxrpc_queue_work(&local->rejecter);
+}
+
+/*
+ * reject packets through the local endpoint
+ */
+void rxrpc_reject_packets(struct work_struct *work)
+{
+ union {
+ struct sockaddr sa;
+ struct sockaddr_in sin;
+ } sa;
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_header hdr;
+ struct rxrpc_local *local;
+ struct sk_buff *skb;
+ struct msghdr msg;
+ struct kvec iov[2];
+ size_t size;
+ __be32 code;
+
+ local = container_of(work, struct rxrpc_local, rejecter);
+ rxrpc_get_local(local);
+
+ _enter("%d", local->debug_id);
+
+ iov[0].iov_base = &hdr;
+ iov[0].iov_len = sizeof(hdr);
+ iov[1].iov_base = &code;
+ iov[1].iov_len = sizeof(code);
+ size = sizeof(hdr) + sizeof(code);
+
+ msg.msg_name = &sa;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa.sa_family = local->srx.transport.family;
+ switch (sa.sa.sa_family) {
+ case AF_INET:
+ msg.msg_namelen = sizeof(sa.sin);
+ break;
+ default:
+ msg.msg_namelen = 0;
+ break;
+ }
+
+ memset(&hdr, 0, sizeof(hdr));
+ hdr.type = RXRPC_PACKET_TYPE_ABORT;
+
+ while ((skb = skb_dequeue(&local->reject_queue))) {
+ sp = rxrpc_skb(skb);
+ switch (sa.sa.sa_family) {
+ case AF_INET:
+ sa.sin.sin_port = udp_hdr(skb)->source;
+ sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+ code = htonl(skb->priority);
+
+ hdr.epoch = sp->hdr.epoch;
+ hdr.cid = sp->hdr.cid;
+ hdr.callNumber = sp->hdr.callNumber;
+ hdr.serviceId = sp->hdr.serviceId;
+ hdr.flags = sp->hdr.flags;
+ hdr.flags ^= RXRPC_CLIENT_INITIATED;
+ hdr.flags &= RXRPC_CLIENT_INITIATED;
+
+ kernel_sendmsg(local->socket, &msg, iov, 2, size);
+ break;
+
+ default:
+ break;
+ }
+
+ rxrpc_free_skb(skb);
+ rxrpc_put_local(local);
+ }
+
+ rxrpc_put_local(local);
+ _leave("");
+}
diff --git a/net/rxrpc/ar-error.c b/net/rxrpc/ar-error.c
new file mode 100644
index 000000000..0610efa83
--- /dev/null
+++ b/net/rxrpc/ar-error.c
@@ -0,0 +1,241 @@
+/* Error message handling (ICMP)
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * handle an error received on the local endpoint
+ */
+void rxrpc_UDP_error_report(struct sock *sk)
+{
+ struct sock_exterr_skb *serr;
+ struct rxrpc_transport *trans;
+ struct rxrpc_local *local = sk->sk_user_data;
+ struct rxrpc_peer *peer;
+ struct sk_buff *skb;
+ __be32 addr;
+ __be16 port;
+
+ _enter("%p{%d}", sk, local->debug_id);
+
+ skb = sock_dequeue_err_skb(sk);
+ if (!skb) {
+ _leave("UDP socket errqueue empty");
+ return;
+ }
+ serr = SKB_EXT_ERR(skb);
+ if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
+ _leave("UDP empty message");
+ kfree_skb(skb);
+ return;
+ }
+
+ rxrpc_new_skb(skb);
+
+ addr = *(__be32 *)(skb_network_header(skb) + serr->addr_offset);
+ port = serr->port;
+
+ _net("Rx UDP Error from %pI4:%hu", &addr, ntohs(port));
+ _debug("Msg l:%d d:%d", skb->len, skb->data_len);
+
+ peer = rxrpc_find_peer(local, addr, port);
+ if (IS_ERR(peer)) {
+ rxrpc_free_skb(skb);
+ _leave(" [no peer]");
+ return;
+ }
+
+ trans = rxrpc_find_transport(local, peer);
+ if (!trans) {
+ rxrpc_put_peer(peer);
+ rxrpc_free_skb(skb);
+ _leave(" [no trans]");
+ return;
+ }
+
+ if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
+ serr->ee.ee_type == ICMP_DEST_UNREACH &&
+ serr->ee.ee_code == ICMP_FRAG_NEEDED
+ ) {
+ u32 mtu = serr->ee.ee_info;
+
+ _net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
+
+ /* wind down the local interface MTU */
+ if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
+ peer->if_mtu = mtu;
+ _net("I/F MTU %u", mtu);
+ }
+
+ if (mtu == 0) {
+ /* they didn't give us a size, estimate one */
+ mtu = peer->if_mtu;
+ if (mtu > 1500) {
+ mtu >>= 1;
+ if (mtu < 1500)
+ mtu = 1500;
+ } else {
+ mtu -= 100;
+ if (mtu < peer->hdrsize)
+ mtu = peer->hdrsize + 4;
+ }
+ }
+
+ if (mtu < peer->mtu) {
+ spin_lock_bh(&peer->lock);
+ peer->mtu = mtu;
+ peer->maxdata = peer->mtu - peer->hdrsize;
+ spin_unlock_bh(&peer->lock);
+ _net("Net MTU %u (maxdata %u)",
+ peer->mtu, peer->maxdata);
+ }
+ }
+
+ rxrpc_put_peer(peer);
+
+ /* pass the transport ref to error_handler to release */
+ skb_queue_tail(&trans->error_queue, skb);
+ rxrpc_queue_work(&trans->error_handler);
+
+ _leave("");
+}
+
+/*
+ * deal with UDP error messages
+ */
+void rxrpc_UDP_error_handler(struct work_struct *work)
+{
+ struct sock_extended_err *ee;
+ struct sock_exterr_skb *serr;
+ struct rxrpc_transport *trans =
+ container_of(work, struct rxrpc_transport, error_handler);
+ struct sk_buff *skb;
+ int err;
+
+ _enter("");
+
+ skb = skb_dequeue(&trans->error_queue);
+ if (!skb)
+ return;
+
+ serr = SKB_EXT_ERR(skb);
+ ee = &serr->ee;
+
+ _net("Rx Error o=%d t=%d c=%d e=%d",
+ ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
+
+ err = ee->ee_errno;
+
+ switch (ee->ee_origin) {
+ case SO_EE_ORIGIN_ICMP:
+ switch (ee->ee_type) {
+ case ICMP_DEST_UNREACH:
+ switch (ee->ee_code) {
+ case ICMP_NET_UNREACH:
+ _net("Rx Received ICMP Network Unreachable");
+ err = ENETUNREACH;
+ break;
+ case ICMP_HOST_UNREACH:
+ _net("Rx Received ICMP Host Unreachable");
+ err = EHOSTUNREACH;
+ break;
+ case ICMP_PORT_UNREACH:
+ _net("Rx Received ICMP Port Unreachable");
+ err = ECONNREFUSED;
+ break;
+ case ICMP_FRAG_NEEDED:
+ _net("Rx Received ICMP Fragmentation Needed (%d)",
+ ee->ee_info);
+ err = 0; /* dealt with elsewhere */
+ break;
+ case ICMP_NET_UNKNOWN:
+ _net("Rx Received ICMP Unknown Network");
+ err = ENETUNREACH;
+ break;
+ case ICMP_HOST_UNKNOWN:
+ _net("Rx Received ICMP Unknown Host");
+ err = EHOSTUNREACH;
+ break;
+ default:
+ _net("Rx Received ICMP DestUnreach code=%u",
+ ee->ee_code);
+ break;
+ }
+ break;
+
+ case ICMP_TIME_EXCEEDED:
+ _net("Rx Received ICMP TTL Exceeded");
+ break;
+
+ default:
+ _proto("Rx Received ICMP error { type=%u code=%u }",
+ ee->ee_type, ee->ee_code);
+ break;
+ }
+ break;
+
+ case SO_EE_ORIGIN_LOCAL:
+ _proto("Rx Received local error { error=%d }",
+ ee->ee_errno);
+ break;
+
+ case SO_EE_ORIGIN_NONE:
+ case SO_EE_ORIGIN_ICMP6:
+ default:
+ _proto("Rx Received error report { orig=%u }",
+ ee->ee_origin);
+ break;
+ }
+
+ /* terminate all the affected calls if there's an unrecoverable
+ * error */
+ if (err) {
+ struct rxrpc_call *call, *_n;
+
+ _debug("ISSUE ERROR %d", err);
+
+ spin_lock_bh(&trans->peer->lock);
+ trans->peer->net_error = err;
+
+ list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
+ error_link) {
+ write_lock(&call->state_lock);
+ if (call->state != RXRPC_CALL_COMPLETE &&
+ call->state < RXRPC_CALL_NETWORK_ERROR) {
+ call->state = RXRPC_CALL_NETWORK_ERROR;
+ set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
+ rxrpc_queue_call(call);
+ }
+ write_unlock(&call->state_lock);
+ list_del_init(&call->error_link);
+ }
+
+ spin_unlock_bh(&trans->peer->lock);
+ }
+
+ if (!skb_queue_empty(&trans->error_queue))
+ rxrpc_queue_work(&trans->error_handler);
+
+ rxrpc_free_skb(skb);
+ rxrpc_put_transport(trans);
+ _leave("");
+}
diff --git a/net/rxrpc/ar-input.c b/net/rxrpc/ar-input.c
new file mode 100644
index 000000000..4505a691d
--- /dev/null
+++ b/net/rxrpc/ar-input.c
@@ -0,0 +1,788 @@
+/* RxRPC packet reception
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <linux/gfp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/net_namespace.h>
+#include "ar-internal.h"
+
+const char *rxrpc_pkts[] = {
+ "?00",
+ "DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
+ "?09", "?10", "?11", "?12", "VERSION", "?14", "?15"
+};
+
+/*
+ * queue a packet for recvmsg to pass to userspace
+ * - the caller must hold a lock on call->lock
+ * - must not be called with interrupts disabled (sk_filter() disables BH's)
+ * - eats the packet whether successful or not
+ * - there must be just one reference to the packet, which the caller passes to
+ * this function
+ */
+int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
+ bool force, bool terminal)
+{
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_sock *rx = call->socket;
+ struct sock *sk;
+ int ret;
+
+ _enter(",,%d,%d", force, terminal);
+
+ ASSERT(!irqs_disabled());
+
+ sp = rxrpc_skb(skb);
+ ASSERTCMP(sp->call, ==, call);
+
+ /* if we've already posted the terminal message for a call, then we
+ * don't post any more */
+ if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
+ _debug("already terminated");
+ ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
+ skb->destructor = NULL;
+ sp->call = NULL;
+ rxrpc_put_call(call);
+ rxrpc_free_skb(skb);
+ return 0;
+ }
+
+ sk = &rx->sk;
+
+ if (!force) {
+ /* cast skb->rcvbuf to unsigned... It's pointless, but
+ * reduces number of warnings when compiling with -W
+ * --ANK */
+// ret = -ENOBUFS;
+// if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
+// (unsigned int) sk->sk_rcvbuf)
+// goto out;
+
+ ret = sk_filter(sk, skb);
+ if (ret < 0)
+ goto out;
+ }
+
+ spin_lock_bh(&sk->sk_receive_queue.lock);
+ if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
+ !test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+ call->socket->sk.sk_state != RXRPC_CLOSE) {
+ skb->destructor = rxrpc_packet_destructor;
+ skb->dev = NULL;
+ skb->sk = sk;
+ atomic_add(skb->truesize, &sk->sk_rmem_alloc);
+
+ if (terminal) {
+ _debug("<<<< TERMINAL MESSAGE >>>>");
+ set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
+ }
+
+ /* allow interception by a kernel service */
+ if (rx->interceptor) {
+ rx->interceptor(sk, call->user_call_ID, skb);
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ } else {
+ _net("post skb %p", skb);
+ __skb_queue_tail(&sk->sk_receive_queue, skb);
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_data_ready(sk);
+ }
+ skb = NULL;
+ } else {
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ }
+ ret = 0;
+
+out:
+ /* release the socket buffer */
+ if (skb) {
+ skb->destructor = NULL;
+ sp->call = NULL;
+ rxrpc_put_call(call);
+ rxrpc_free_skb(skb);
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * process a DATA packet, posting the packet to the appropriate queue
+ * - eats the packet if successful
+ */
+static int rxrpc_fast_process_data(struct rxrpc_call *call,
+ struct sk_buff *skb, u32 seq)
+{
+ struct rxrpc_skb_priv *sp;
+ bool terminal;
+ int ret, ackbit, ack;
+
+ _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
+
+ sp = rxrpc_skb(skb);
+ ASSERTCMP(sp->call, ==, NULL);
+
+ spin_lock(&call->lock);
+
+ if (call->state > RXRPC_CALL_COMPLETE)
+ goto discard;
+
+ ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
+ ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
+ ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
+
+ if (seq < call->rx_data_post) {
+ _debug("dup #%u [-%u]", seq, call->rx_data_post);
+ ack = RXRPC_ACK_DUPLICATE;
+ ret = -ENOBUFS;
+ goto discard_and_ack;
+ }
+
+ /* we may already have the packet in the out of sequence queue */
+ ackbit = seq - (call->rx_data_eaten + 1);
+ ASSERTCMP(ackbit, >=, 0);
+ if (__test_and_set_bit(ackbit, call->ackr_window)) {
+ _debug("dup oos #%u [%u,%u]",
+ seq, call->rx_data_eaten, call->rx_data_post);
+ ack = RXRPC_ACK_DUPLICATE;
+ goto discard_and_ack;
+ }
+
+ if (seq >= call->ackr_win_top) {
+ _debug("exceed #%u [%u]", seq, call->ackr_win_top);
+ __clear_bit(ackbit, call->ackr_window);
+ ack = RXRPC_ACK_EXCEEDS_WINDOW;
+ goto discard_and_ack;
+ }
+
+ if (seq == call->rx_data_expect) {
+ clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
+ call->rx_data_expect++;
+ } else if (seq > call->rx_data_expect) {
+ _debug("oos #%u [%u]", seq, call->rx_data_expect);
+ call->rx_data_expect = seq + 1;
+ if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
+ ack = RXRPC_ACK_OUT_OF_SEQUENCE;
+ goto enqueue_and_ack;
+ }
+ goto enqueue_packet;
+ }
+
+ if (seq != call->rx_data_post) {
+ _debug("ahead #%u [%u]", seq, call->rx_data_post);
+ goto enqueue_packet;
+ }
+
+ if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
+ goto protocol_error;
+
+ /* if the packet need security things doing to it, then it goes down
+ * the slow path */
+ if (call->conn->security)
+ goto enqueue_packet;
+
+ sp->call = call;
+ rxrpc_get_call(call);
+ terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
+ !(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
+ ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
+ if (ret < 0) {
+ if (ret == -ENOMEM || ret == -ENOBUFS) {
+ __clear_bit(ackbit, call->ackr_window);
+ ack = RXRPC_ACK_NOSPACE;
+ goto discard_and_ack;
+ }
+ goto out;
+ }
+
+ skb = NULL;
+
+ _debug("post #%u", seq);
+ ASSERTCMP(call->rx_data_post, ==, seq);
+ call->rx_data_post++;
+
+ if (sp->hdr.flags & RXRPC_LAST_PACKET)
+ set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
+
+ /* if we've reached an out of sequence packet then we need to drain
+ * that queue into the socket Rx queue now */
+ if (call->rx_data_post == call->rx_first_oos) {
+ _debug("drain rx oos now");
+ read_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock(&call->state_lock);
+ }
+
+ spin_unlock(&call->lock);
+ atomic_inc(&call->ackr_not_idle);
+ rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false);
+ _leave(" = 0 [posted]");
+ return 0;
+
+protocol_error:
+ ret = -EBADMSG;
+out:
+ spin_unlock(&call->lock);
+ _leave(" = %d", ret);
+ return ret;
+
+discard_and_ack:
+ _debug("discard and ACK packet %p", skb);
+ __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
+discard:
+ spin_unlock(&call->lock);
+ rxrpc_free_skb(skb);
+ _leave(" = 0 [discarded]");
+ return 0;
+
+enqueue_and_ack:
+ __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
+enqueue_packet:
+ _net("defer skb %p", skb);
+ spin_unlock(&call->lock);
+ skb_queue_tail(&call->rx_queue, skb);
+ atomic_inc(&call->ackr_not_idle);
+ read_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_DEAD)
+ rxrpc_queue_call(call);
+ read_unlock(&call->state_lock);
+ _leave(" = 0 [queued]");
+ return 0;
+}
+
+/*
+ * assume an implicit ACKALL of the transmission phase of a client socket upon
+ * reception of the first reply packet
+ */
+static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
+{
+ write_lock_bh(&call->state_lock);
+
+ switch (call->state) {
+ case RXRPC_CALL_CLIENT_AWAIT_REPLY:
+ call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
+ call->acks_latest = serial;
+
+ _debug("implicit ACKALL %%%u", call->acks_latest);
+ set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events);
+ write_unlock_bh(&call->state_lock);
+
+ if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
+ clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+ clear_bit(RXRPC_CALL_RESEND, &call->events);
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ }
+ break;
+
+ default:
+ write_unlock_bh(&call->state_lock);
+ break;
+ }
+}
+
+/*
+ * post an incoming packet to the nominated call to deal with
+ * - must get rid of the sk_buff, either by freeing it or by queuing it
+ */
+void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ __be32 _abort_code;
+ u32 serial, hi_serial, seq, abort_code;
+
+ _enter("%p,%p", call, skb);
+
+ ASSERT(!irqs_disabled());
+
+#if 0 // INJECT RX ERROR
+ if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
+ static int skip = 0;
+ if (++skip == 3) {
+ printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
+ skip = 0;
+ goto free_packet;
+ }
+ }
+#endif
+
+ /* track the latest serial number on this connection for ACK packet
+ * information */
+ serial = ntohl(sp->hdr.serial);
+ hi_serial = atomic_read(&call->conn->hi_serial);
+ while (serial > hi_serial)
+ hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
+ serial);
+
+ /* request ACK generation for any ACK or DATA packet that requests
+ * it */
+ if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
+ _proto("ACK Requested on %%%u", serial);
+ rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false);
+ }
+
+ switch (sp->hdr.type) {
+ case RXRPC_PACKET_TYPE_ABORT:
+ _debug("abort");
+
+ if (skb_copy_bits(skb, 0, &_abort_code,
+ sizeof(_abort_code)) < 0)
+ goto protocol_error;
+
+ abort_code = ntohl(_abort_code);
+ _proto("Rx ABORT %%%u { %x }", serial, abort_code);
+
+ write_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ call->state = RXRPC_CALL_REMOTELY_ABORTED;
+ call->abort_code = abort_code;
+ set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+ rxrpc_queue_call(call);
+ }
+ goto free_packet_unlock;
+
+ case RXRPC_PACKET_TYPE_BUSY:
+ _proto("Rx BUSY %%%u", serial);
+
+ if (call->conn->out_clientflag)
+ goto protocol_error;
+
+ write_lock_bh(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_CLIENT_SEND_REQUEST:
+ call->state = RXRPC_CALL_SERVER_BUSY;
+ set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
+ rxrpc_queue_call(call);
+ case RXRPC_CALL_SERVER_BUSY:
+ goto free_packet_unlock;
+ default:
+ goto protocol_error_locked;
+ }
+
+ default:
+ _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial);
+ goto protocol_error;
+
+ case RXRPC_PACKET_TYPE_DATA:
+ seq = ntohl(sp->hdr.seq);
+
+ _proto("Rx DATA %%%u { #%u }", serial, seq);
+
+ if (seq == 0)
+ goto protocol_error;
+
+ call->ackr_prev_seq = sp->hdr.seq;
+
+ /* received data implicitly ACKs all of the request packets we
+ * sent when we're acting as a client */
+ if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
+ rxrpc_assume_implicit_ackall(call, serial);
+
+ switch (rxrpc_fast_process_data(call, skb, seq)) {
+ case 0:
+ skb = NULL;
+ goto done;
+
+ default:
+ BUG();
+
+ /* data packet received beyond the last packet */
+ case -EBADMSG:
+ goto protocol_error;
+ }
+
+ case RXRPC_PACKET_TYPE_ACKALL:
+ case RXRPC_PACKET_TYPE_ACK:
+ /* ACK processing is done in process context */
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_DEAD) {
+ skb_queue_tail(&call->rx_queue, skb);
+ rxrpc_queue_call(call);
+ skb = NULL;
+ }
+ read_unlock_bh(&call->state_lock);
+ goto free_packet;
+ }
+
+protocol_error:
+ _debug("protocol error");
+ write_lock_bh(&call->state_lock);
+protocol_error_locked:
+ if (call->state <= RXRPC_CALL_COMPLETE) {
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = RX_PROTOCOL_ERROR;
+ set_bit(RXRPC_CALL_ABORT, &call->events);
+ rxrpc_queue_call(call);
+ }
+free_packet_unlock:
+ write_unlock_bh(&call->state_lock);
+free_packet:
+ rxrpc_free_skb(skb);
+done:
+ _leave("");
+}
+
+/*
+ * split up a jumbo data packet
+ */
+static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
+ struct sk_buff *jumbo)
+{
+ struct rxrpc_jumbo_header jhdr;
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *part;
+
+ _enter(",{%u,%u}", jumbo->data_len, jumbo->len);
+
+ sp = rxrpc_skb(jumbo);
+
+ do {
+ sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
+
+ /* make a clone to represent the first subpacket in what's left
+ * of the jumbo packet */
+ part = skb_clone(jumbo, GFP_ATOMIC);
+ if (!part) {
+ /* simply ditch the tail in the event of ENOMEM */
+ pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
+ break;
+ }
+ rxrpc_new_skb(part);
+
+ pskb_trim(part, RXRPC_JUMBO_DATALEN);
+
+ if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
+ goto protocol_error;
+
+ if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
+ goto protocol_error;
+ if (!pskb_pull(jumbo, sizeof(jhdr)))
+ BUG();
+
+ sp->hdr.seq = htonl(ntohl(sp->hdr.seq) + 1);
+ sp->hdr.serial = htonl(ntohl(sp->hdr.serial) + 1);
+ sp->hdr.flags = jhdr.flags;
+ sp->hdr._rsvd = jhdr._rsvd;
+
+ _proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1);
+
+ rxrpc_fast_process_packet(call, part);
+ part = NULL;
+
+ } while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
+
+ rxrpc_fast_process_packet(call, jumbo);
+ _leave("");
+ return;
+
+protocol_error:
+ _debug("protocol error");
+ rxrpc_free_skb(part);
+ rxrpc_free_skb(jumbo);
+ write_lock_bh(&call->state_lock);
+ if (call->state <= RXRPC_CALL_COMPLETE) {
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = RX_PROTOCOL_ERROR;
+ set_bit(RXRPC_CALL_ABORT, &call->events);
+ rxrpc_queue_call(call);
+ }
+ write_unlock_bh(&call->state_lock);
+ _leave("");
+}
+
+/*
+ * post an incoming packet to the appropriate call/socket to deal with
+ * - must get rid of the sk_buff, either by freeing it or by queuing it
+ */
+static void rxrpc_post_packet_to_call(struct rxrpc_call *call,
+ struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp;
+
+ _enter("%p,%p", call, skb);
+
+ sp = rxrpc_skb(skb);
+
+ _debug("extant call [%d]", call->state);
+
+ read_lock(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_LOCALLY_ABORTED:
+ if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) {
+ rxrpc_queue_call(call);
+ goto free_unlock;
+ }
+ case RXRPC_CALL_REMOTELY_ABORTED:
+ case RXRPC_CALL_NETWORK_ERROR:
+ case RXRPC_CALL_DEAD:
+ goto dead_call;
+ case RXRPC_CALL_COMPLETE:
+ case RXRPC_CALL_CLIENT_FINAL_ACK:
+ /* complete server call */
+ if (call->conn->in_clientflag)
+ goto dead_call;
+ /* resend last packet of a completed call */
+ _debug("final ack again");
+ rxrpc_get_call(call);
+ set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
+ rxrpc_queue_call(call);
+ goto free_unlock;
+ default:
+ break;
+ }
+
+ read_unlock(&call->state_lock);
+ rxrpc_get_call(call);
+
+ if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+ sp->hdr.flags & RXRPC_JUMBO_PACKET)
+ rxrpc_process_jumbo_packet(call, skb);
+ else
+ rxrpc_fast_process_packet(call, skb);
+
+ rxrpc_put_call(call);
+ goto done;
+
+dead_call:
+ if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
+ skb->priority = RX_CALL_DEAD;
+ rxrpc_reject_packet(call->conn->trans->local, skb);
+ goto unlock;
+ }
+free_unlock:
+ rxrpc_free_skb(skb);
+unlock:
+ read_unlock(&call->state_lock);
+done:
+ _leave("");
+}
+
+/*
+ * post connection-level events to the connection
+ * - this includes challenges, responses and some aborts
+ */
+static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
+ struct sk_buff *skb)
+{
+ _enter("%p,%p", conn, skb);
+
+ atomic_inc(&conn->usage);
+ skb_queue_tail(&conn->rx_queue, skb);
+ rxrpc_queue_conn(conn);
+}
+
+/*
+ * post endpoint-level events to the local endpoint
+ * - this includes debug and version messages
+ */
+static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
+ struct sk_buff *skb)
+{
+ _enter("%p,%p", local, skb);
+
+ atomic_inc(&local->usage);
+ skb_queue_tail(&local->event_queue, skb);
+ rxrpc_queue_work(&local->event_processor);
+}
+
+static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local,
+ struct sk_buff *skb,
+ struct rxrpc_skb_priv *sp)
+{
+ struct rxrpc_peer *peer;
+ struct rxrpc_transport *trans;
+ struct rxrpc_connection *conn;
+
+ peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr,
+ udp_hdr(skb)->source);
+ if (IS_ERR(peer))
+ goto cant_find_conn;
+
+ trans = rxrpc_find_transport(local, peer);
+ rxrpc_put_peer(peer);
+ if (!trans)
+ goto cant_find_conn;
+
+ conn = rxrpc_find_connection(trans, &sp->hdr);
+ rxrpc_put_transport(trans);
+ if (!conn)
+ goto cant_find_conn;
+
+ return conn;
+cant_find_conn:
+ return NULL;
+}
+
+/*
+ * handle data received on the local endpoint
+ * - may be called in interrupt context
+ */
+void rxrpc_data_ready(struct sock *sk)
+{
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_local *local;
+ struct sk_buff *skb;
+ int ret;
+
+ _enter("%p", sk);
+
+ ASSERT(!irqs_disabled());
+
+ read_lock_bh(&rxrpc_local_lock);
+ local = sk->sk_user_data;
+ if (local && atomic_read(&local->usage) > 0)
+ rxrpc_get_local(local);
+ else
+ local = NULL;
+ read_unlock_bh(&rxrpc_local_lock);
+ if (!local) {
+ _leave(" [local dead]");
+ return;
+ }
+
+ skb = skb_recv_datagram(sk, 0, 1, &ret);
+ if (!skb) {
+ rxrpc_put_local(local);
+ if (ret == -EAGAIN)
+ return;
+ _debug("UDP socket error %d", ret);
+ return;
+ }
+
+ rxrpc_new_skb(skb);
+
+ _net("recv skb %p", skb);
+
+ /* we'll probably need to checksum it (didn't call sock_recvmsg) */
+ if (skb_checksum_complete(skb)) {
+ rxrpc_free_skb(skb);
+ rxrpc_put_local(local);
+ UDP_INC_STATS_BH(&init_net, UDP_MIB_INERRORS, 0);
+ _leave(" [CSUM failed]");
+ return;
+ }
+
+ UDP_INC_STATS_BH(&init_net, UDP_MIB_INDATAGRAMS, 0);
+
+ /* the socket buffer we have is owned by UDP, with UDP's data all over
+ * it, but we really want our own */
+ skb_orphan(skb);
+ sp = rxrpc_skb(skb);
+ memset(sp, 0, sizeof(*sp));
+
+ _net("Rx UDP packet from %08x:%04hu",
+ ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
+
+ /* dig out the RxRPC connection details */
+ if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr,
+ sizeof(sp->hdr)) < 0)
+ goto bad_message;
+ if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr)))
+ BUG();
+
+ _net("Rx RxRPC %s ep=%x call=%x:%x",
+ sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
+ ntohl(sp->hdr.epoch),
+ ntohl(sp->hdr.cid),
+ ntohl(sp->hdr.callNumber));
+
+ if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
+ _proto("Rx Bad Packet Type %u", sp->hdr.type);
+ goto bad_message;
+ }
+
+ if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) {
+ rxrpc_post_packet_to_local(local, skb);
+ goto out;
+ }
+
+ if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+ (sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
+ goto bad_message;
+
+ if (sp->hdr.callNumber == 0) {
+ /* This is a connection-level packet. These should be
+ * fairly rare, so the extra overhead of looking them up the
+ * old-fashioned way doesn't really hurt */
+ struct rxrpc_connection *conn;
+
+ conn = rxrpc_conn_from_local(local, skb, sp);
+ if (!conn)
+ goto cant_route_call;
+
+ _debug("CONN %p {%d}", conn, conn->debug_id);
+ rxrpc_post_packet_to_conn(conn, skb);
+ rxrpc_put_connection(conn);
+ } else {
+ struct rxrpc_call *call;
+ u8 in_clientflag = 0;
+
+ if (sp->hdr.flags & RXRPC_CLIENT_INITIATED)
+ in_clientflag = RXRPC_CLIENT_INITIATED;
+ call = rxrpc_find_call_hash(in_clientflag, sp->hdr.cid,
+ sp->hdr.callNumber, sp->hdr.epoch,
+ sp->hdr.serviceId, local, AF_INET,
+ (u8 *)&ip_hdr(skb)->saddr);
+ if (call)
+ rxrpc_post_packet_to_call(call, skb);
+ else
+ goto cant_route_call;
+ }
+
+out:
+ rxrpc_put_local(local);
+ return;
+
+cant_route_call:
+ _debug("can't route call");
+ if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
+ sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
+ if (sp->hdr.seq == cpu_to_be32(1)) {
+ _debug("first packet");
+ skb_queue_tail(&local->accept_queue, skb);
+ rxrpc_queue_work(&local->acceptor);
+ rxrpc_put_local(local);
+ _leave(" [incoming]");
+ return;
+ }
+ skb->priority = RX_INVALID_OPERATION;
+ } else {
+ skb->priority = RX_CALL_DEAD;
+ }
+
+ if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
+ _debug("reject type %d",sp->hdr.type);
+ rxrpc_reject_packet(local, skb);
+ }
+ rxrpc_put_local(local);
+ _leave(" [no call]");
+ return;
+
+bad_message:
+ skb->priority = RX_PROTOCOL_ERROR;
+ rxrpc_reject_packet(local, skb);
+ rxrpc_put_local(local);
+ _leave(" [badmsg]");
+}
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
new file mode 100644
index 000000000..aef1bd294
--- /dev/null
+++ b/net/rxrpc/ar-internal.h
@@ -0,0 +1,812 @@
+/* AF_RXRPC internal definitions
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <rxrpc/packet.h>
+
+#if 0
+#define CHECK_SLAB_OKAY(X) \
+ BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
+ (POISON_FREE << 8 | POISON_FREE))
+#else
+#define CHECK_SLAB_OKAY(X) do {} while(0)
+#endif
+
+#define FCRYPT_BSIZE 8
+struct rxrpc_crypt {
+ union {
+ u8 x[FCRYPT_BSIZE];
+ __be32 n[2];
+ };
+} __attribute__((aligned(8)));
+
+#define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
+#define rxrpc_queue_delayed_work(WS,D) \
+ queue_delayed_work(rxrpc_workqueue, (WS), (D))
+
+#define rxrpc_queue_call(CALL) rxrpc_queue_work(&(CALL)->processor)
+#define rxrpc_queue_conn(CONN) rxrpc_queue_work(&(CONN)->processor)
+
+/*
+ * sk_state for RxRPC sockets
+ */
+enum {
+ RXRPC_UNCONNECTED = 0,
+ RXRPC_CLIENT_BOUND, /* client local address bound */
+ RXRPC_CLIENT_CONNECTED, /* client is connected */
+ RXRPC_SERVER_BOUND, /* server local address bound */
+ RXRPC_SERVER_LISTENING, /* server listening for connections */
+ RXRPC_CLOSE, /* socket is being closed */
+};
+
+/*
+ * RxRPC socket definition
+ */
+struct rxrpc_sock {
+ /* WARNING: sk has to be the first member */
+ struct sock sk;
+ rxrpc_interceptor_t interceptor; /* kernel service Rx interceptor function */
+ struct rxrpc_local *local; /* local endpoint */
+ struct rxrpc_transport *trans; /* transport handler */
+ struct rxrpc_conn_bundle *bundle; /* virtual connection bundle */
+ struct rxrpc_connection *conn; /* exclusive virtual connection */
+ struct list_head listen_link; /* link in the local endpoint's listen list */
+ struct list_head secureq; /* calls awaiting connection security clearance */
+ struct list_head acceptq; /* calls awaiting acceptance */
+ struct key *key; /* security for this socket */
+ struct key *securities; /* list of server security descriptors */
+ struct rb_root calls; /* outstanding calls on this socket */
+ unsigned long flags;
+#define RXRPC_SOCK_EXCLUSIVE_CONN 1 /* exclusive connection for a client socket */
+ rwlock_t call_lock; /* lock for calls */
+ u32 min_sec_level; /* minimum security level */
+#define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
+ struct sockaddr_rxrpc srx; /* local address */
+ sa_family_t proto; /* protocol created with */
+ __be16 service_id; /* service ID of local/remote service */
+};
+
+#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
+
+/*
+ * RxRPC socket buffer private variables
+ * - max 48 bytes (struct sk_buff::cb)
+ */
+struct rxrpc_skb_priv {
+ struct rxrpc_call *call; /* call with which associated */
+ unsigned long resend_at; /* time in jiffies at which to resend */
+ union {
+ unsigned int offset; /* offset into buffer of next read */
+ int remain; /* amount of space remaining for next write */
+ u32 error; /* network error code */
+ bool need_resend; /* T if needs resending */
+ };
+
+ struct rxrpc_header hdr; /* RxRPC packet header from this packet */
+};
+
+#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
+
+enum rxrpc_command {
+ RXRPC_CMD_SEND_DATA, /* send data message */
+ RXRPC_CMD_SEND_ABORT, /* request abort generation */
+ RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
+ RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
+};
+
+/*
+ * RxRPC security module interface
+ */
+struct rxrpc_security {
+ struct module *owner; /* providing module */
+ struct list_head link; /* link in master list */
+ const char *name; /* name of this service */
+ u8 security_index; /* security type provided */
+
+ /* initialise a connection's security */
+ int (*init_connection_security)(struct rxrpc_connection *);
+
+ /* prime a connection's packet security */
+ void (*prime_packet_security)(struct rxrpc_connection *);
+
+ /* impose security on a packet */
+ int (*secure_packet)(const struct rxrpc_call *,
+ struct sk_buff *,
+ size_t,
+ void *);
+
+ /* verify the security on a received packet */
+ int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
+ u32 *);
+
+ /* issue a challenge */
+ int (*issue_challenge)(struct rxrpc_connection *);
+
+ /* respond to a challenge */
+ int (*respond_to_challenge)(struct rxrpc_connection *,
+ struct sk_buff *,
+ u32 *);
+
+ /* verify a response */
+ int (*verify_response)(struct rxrpc_connection *,
+ struct sk_buff *,
+ u32 *);
+
+ /* clear connection security */
+ void (*clear)(struct rxrpc_connection *);
+};
+
+/*
+ * RxRPC local transport endpoint definition
+ * - matched by local port, address and protocol type
+ */
+struct rxrpc_local {
+ struct socket *socket; /* my UDP socket */
+ struct work_struct destroyer; /* endpoint destroyer */
+ struct work_struct acceptor; /* incoming call processor */
+ struct work_struct rejecter; /* packet reject writer */
+ struct work_struct event_processor; /* endpoint event processor */
+ struct list_head services; /* services listening on this endpoint */
+ struct list_head link; /* link in endpoint list */
+ struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
+ struct sk_buff_head accept_queue; /* incoming calls awaiting acceptance */
+ struct sk_buff_head reject_queue; /* packets awaiting rejection */
+ struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
+ spinlock_t lock; /* access lock */
+ rwlock_t services_lock; /* lock for services list */
+ atomic_t usage;
+ int debug_id; /* debug ID for printks */
+ volatile char error_rcvd; /* T if received ICMP error outstanding */
+ struct sockaddr_rxrpc srx; /* local address */
+};
+
+/*
+ * RxRPC remote transport endpoint definition
+ * - matched by remote port, address and protocol type
+ * - holds the connection ID counter for connections between the two endpoints
+ */
+struct rxrpc_peer {
+ struct work_struct destroyer; /* peer destroyer */
+ struct list_head link; /* link in master peer list */
+ struct list_head error_targets; /* targets for net error distribution */
+ spinlock_t lock; /* access lock */
+ atomic_t usage;
+ unsigned int if_mtu; /* interface MTU for this peer */
+ unsigned int mtu; /* network MTU for this peer */
+ unsigned int maxdata; /* data size (MTU - hdrsize) */
+ unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
+ int debug_id; /* debug ID for printks */
+ int net_error; /* network error distributed */
+ struct sockaddr_rxrpc srx; /* remote address */
+
+ /* calculated RTT cache */
+#define RXRPC_RTT_CACHE_SIZE 32
+ suseconds_t rtt; /* current RTT estimate (in uS) */
+ unsigned int rtt_point; /* next entry at which to insert */
+ unsigned int rtt_usage; /* amount of cache actually used */
+ suseconds_t rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
+};
+
+/*
+ * RxRPC point-to-point transport / connection manager definition
+ * - handles a bundle of connections between two endpoints
+ * - matched by { local, peer }
+ */
+struct rxrpc_transport {
+ struct rxrpc_local *local; /* local transport endpoint */
+ struct rxrpc_peer *peer; /* remote transport endpoint */
+ struct work_struct error_handler; /* network error distributor */
+ struct rb_root bundles; /* client connection bundles on this transport */
+ struct rb_root client_conns; /* client connections on this transport */
+ struct rb_root server_conns; /* server connections on this transport */
+ struct list_head link; /* link in master session list */
+ struct sk_buff_head error_queue; /* error packets awaiting processing */
+ time_t put_time; /* time at which to reap */
+ spinlock_t client_lock; /* client connection allocation lock */
+ rwlock_t conn_lock; /* lock for active/dead connections */
+ atomic_t usage;
+ int debug_id; /* debug ID for printks */
+ unsigned int conn_idcounter; /* connection ID counter (client) */
+};
+
+/*
+ * RxRPC client connection bundle
+ * - matched by { transport, service_id, key }
+ */
+struct rxrpc_conn_bundle {
+ struct rb_node node; /* node in transport's lookup tree */
+ struct list_head unused_conns; /* unused connections in this bundle */
+ struct list_head avail_conns; /* available connections in this bundle */
+ struct list_head busy_conns; /* busy connections in this bundle */
+ struct key *key; /* security for this bundle */
+ wait_queue_head_t chanwait; /* wait for channel to become available */
+ atomic_t usage;
+ int debug_id; /* debug ID for printks */
+ unsigned short num_conns; /* number of connections in this bundle */
+ __be16 service_id; /* service ID */
+ u8 security_ix; /* security type */
+};
+
+/*
+ * RxRPC connection definition
+ * - matched by { transport, service_id, conn_id, direction, key }
+ * - each connection can only handle four simultaneous calls
+ */
+struct rxrpc_connection {
+ struct rxrpc_transport *trans; /* transport session */
+ struct rxrpc_conn_bundle *bundle; /* connection bundle (client) */
+ struct work_struct processor; /* connection event processor */
+ struct rb_node node; /* node in transport's lookup tree */
+ struct list_head link; /* link in master connection list */
+ struct list_head bundle_link; /* link in bundle */
+ struct rb_root calls; /* calls on this connection */
+ struct sk_buff_head rx_queue; /* received conn-level packets */
+ struct rxrpc_call *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
+ struct rxrpc_security *security; /* applied security module */
+ struct key *key; /* security for this connection (client) */
+ struct key *server_key; /* security for this service */
+ struct crypto_blkcipher *cipher; /* encryption handle */
+ struct rxrpc_crypt csum_iv; /* packet checksum base */
+ unsigned long events;
+#define RXRPC_CONN_CHALLENGE 0 /* send challenge packet */
+ time_t put_time; /* time at which to reap */
+ rwlock_t lock; /* access lock */
+ spinlock_t state_lock; /* state-change lock */
+ atomic_t usage;
+ u32 real_conn_id; /* connection ID (host-endian) */
+ enum { /* current state of connection */
+ RXRPC_CONN_UNUSED, /* - connection not yet attempted */
+ RXRPC_CONN_CLIENT, /* - client connection */
+ RXRPC_CONN_SERVER_UNSECURED, /* - server unsecured connection */
+ RXRPC_CONN_SERVER_CHALLENGING, /* - server challenging for security */
+ RXRPC_CONN_SERVER, /* - server secured connection */
+ RXRPC_CONN_REMOTELY_ABORTED, /* - conn aborted by peer */
+ RXRPC_CONN_LOCALLY_ABORTED, /* - conn aborted locally */
+ RXRPC_CONN_NETWORK_ERROR, /* - conn terminated by network error */
+ } state;
+ int error; /* error code for local abort */
+ int debug_id; /* debug ID for printks */
+ unsigned int call_counter; /* call ID counter */
+ atomic_t serial; /* packet serial number counter */
+ atomic_t hi_serial; /* highest serial number received */
+ u8 avail_calls; /* number of calls available */
+ u8 size_align; /* data size alignment (for security) */
+ u8 header_size; /* rxrpc + security header size */
+ u8 security_size; /* security header size */
+ u32 security_level; /* security level negotiated */
+ u32 security_nonce; /* response re-use preventer */
+
+ /* the following are all in net order */
+ __be32 epoch; /* epoch of this connection */
+ __be32 cid; /* connection ID */
+ __be16 service_id; /* service ID */
+ u8 security_ix; /* security type */
+ u8 in_clientflag; /* RXRPC_CLIENT_INITIATED if we are server */
+ u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
+};
+
+/*
+ * RxRPC call definition
+ * - matched by { connection, call_id }
+ */
+struct rxrpc_call {
+ struct rxrpc_connection *conn; /* connection carrying call */
+ struct rxrpc_sock *socket; /* socket responsible */
+ struct timer_list lifetimer; /* lifetime remaining on call */
+ struct timer_list deadspan; /* reap timer for re-ACK'ing, etc */
+ struct timer_list ack_timer; /* ACK generation timer */
+ struct timer_list resend_timer; /* Tx resend timer */
+ struct work_struct destroyer; /* call destroyer */
+ struct work_struct processor; /* packet processor and ACK generator */
+ struct list_head link; /* link in master call list */
+ struct list_head error_link; /* link in error distribution list */
+ struct list_head accept_link; /* calls awaiting acceptance */
+ struct rb_node sock_node; /* node in socket call tree */
+ struct rb_node conn_node; /* node in connection call tree */
+ struct sk_buff_head rx_queue; /* received packets */
+ struct sk_buff_head rx_oos_queue; /* packets received out of sequence */
+ struct sk_buff *tx_pending; /* Tx socket buffer being filled */
+ wait_queue_head_t tx_waitq; /* wait for Tx window space to become available */
+ unsigned long user_call_ID; /* user-defined call ID */
+ unsigned long creation_jif; /* time of call creation */
+ unsigned long flags;
+#define RXRPC_CALL_RELEASED 0 /* call has been released - no more message to userspace */
+#define RXRPC_CALL_TERMINAL_MSG 1 /* call has given the socket its final message */
+#define RXRPC_CALL_RCVD_LAST 2 /* all packets received */
+#define RXRPC_CALL_RUN_RTIMER 3 /* Tx resend timer started */
+#define RXRPC_CALL_TX_SOFT_ACK 4 /* sent some soft ACKs */
+#define RXRPC_CALL_PROC_BUSY 5 /* the processor is busy */
+#define RXRPC_CALL_INIT_ACCEPT 6 /* acceptance was initiated */
+#define RXRPC_CALL_HAS_USERID 7 /* has a user ID attached */
+#define RXRPC_CALL_EXPECT_OOS 8 /* expect out of sequence packets */
+ unsigned long events;
+#define RXRPC_CALL_RCVD_ACKALL 0 /* ACKALL or reply received */
+#define RXRPC_CALL_RCVD_BUSY 1 /* busy packet received */
+#define RXRPC_CALL_RCVD_ABORT 2 /* abort packet received */
+#define RXRPC_CALL_RCVD_ERROR 3 /* network error received */
+#define RXRPC_CALL_ACK_FINAL 4 /* need to generate final ACK (and release call) */
+#define RXRPC_CALL_ACK 5 /* need to generate ACK */
+#define RXRPC_CALL_REJECT_BUSY 6 /* need to generate busy message */
+#define RXRPC_CALL_ABORT 7 /* need to generate abort */
+#define RXRPC_CALL_CONN_ABORT 8 /* local connection abort generated */
+#define RXRPC_CALL_RESEND_TIMER 9 /* Tx resend timer expired */
+#define RXRPC_CALL_RESEND 10 /* Tx resend required */
+#define RXRPC_CALL_DRAIN_RX_OOS 11 /* drain the Rx out of sequence queue */
+#define RXRPC_CALL_LIFE_TIMER 12 /* call's lifetimer ran out */
+#define RXRPC_CALL_ACCEPTED 13 /* incoming call accepted by userspace app */
+#define RXRPC_CALL_SECURED 14 /* incoming call's connection is now secure */
+#define RXRPC_CALL_POST_ACCEPT 15 /* need to post an "accept?" message to the app */
+#define RXRPC_CALL_RELEASE 16 /* need to release the call's resources */
+
+ spinlock_t lock;
+ rwlock_t state_lock; /* lock for state transition */
+ atomic_t usage;
+ atomic_t sequence; /* Tx data packet sequence counter */
+ u32 abort_code; /* local/remote abort code */
+ enum { /* current state of call */
+ RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
+ RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
+ RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
+ RXRPC_CALL_CLIENT_FINAL_ACK, /* - client sending final ACK phase */
+ RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
+ RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */
+ RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
+ RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
+ RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
+ RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
+ RXRPC_CALL_COMPLETE, /* - call completed */
+ RXRPC_CALL_SERVER_BUSY, /* - call rejected by busy server */
+ RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
+ RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
+ RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
+ RXRPC_CALL_DEAD, /* - call is dead */
+ } state;
+ int debug_id; /* debug ID for printks */
+ u8 channel; /* connection channel occupied by this call */
+
+ /* transmission-phase ACK management */
+ u8 acks_head; /* offset into window of first entry */
+ u8 acks_tail; /* offset into window of last entry */
+ u8 acks_winsz; /* size of un-ACK'd window */
+ u8 acks_unacked; /* lowest unacked packet in last ACK received */
+ int acks_latest; /* serial number of latest ACK received */
+ rxrpc_seq_t acks_hard; /* highest definitively ACK'd msg seq */
+ unsigned long *acks_window; /* sent packet window
+ * - elements are pointers with LSB set if ACK'd
+ */
+
+ /* receive-phase ACK management */
+ rxrpc_seq_t rx_data_expect; /* next data seq ID expected to be received */
+ rxrpc_seq_t rx_data_post; /* next data seq ID expected to be posted */
+ rxrpc_seq_t rx_data_recv; /* last data seq ID encountered by recvmsg */
+ rxrpc_seq_t rx_data_eaten; /* last data seq ID consumed by recvmsg */
+ rxrpc_seq_t rx_first_oos; /* first packet in rx_oos_queue (or 0) */
+ rxrpc_seq_t ackr_win_top; /* top of ACK window (rx_data_eaten is bottom) */
+ rxrpc_seq_net_t ackr_prev_seq; /* previous sequence number received */
+ u8 ackr_reason; /* reason to ACK */
+ __be32 ackr_serial; /* serial of packet being ACK'd */
+ atomic_t ackr_not_idle; /* number of packets in Rx queue */
+
+ /* received packet records, 1 bit per record */
+#define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
+ unsigned long ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
+
+ struct hlist_node hash_node;
+ unsigned long hash_key; /* Full hash key */
+ u8 in_clientflag; /* Copy of conn->in_clientflag for hashing */
+ struct rxrpc_local *local; /* Local endpoint. Used for hashing. */
+ sa_family_t proto; /* Frame protocol */
+ /* the following should all be in net order */
+ __be32 cid; /* connection ID + channel index */
+ __be32 call_id; /* call ID on connection */
+ __be32 epoch; /* epoch of this connection */
+ __be16 service_id; /* service ID */
+ union { /* Peer IP address for hashing */
+ __be32 ipv4_addr;
+ __u8 ipv6_addr[16]; /* Anticipates eventual IPv6 support */
+ } peer_ip;
+};
+
+/*
+ * locally abort an RxRPC call
+ */
+static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
+{
+ write_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ call->abort_code = abort_code;
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ set_bit(RXRPC_CALL_ABORT, &call->events);
+ }
+ write_unlock_bh(&call->state_lock);
+}
+
+/*
+ * af_rxrpc.c
+ */
+extern atomic_t rxrpc_n_skbs;
+extern __be32 rxrpc_epoch;
+extern atomic_t rxrpc_debug_id;
+extern struct workqueue_struct *rxrpc_workqueue;
+
+/*
+ * ar-accept.c
+ */
+void rxrpc_accept_incoming_calls(struct work_struct *);
+struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
+int rxrpc_reject_call(struct rxrpc_sock *);
+
+/*
+ * ar-ack.c
+ */
+extern unsigned rxrpc_requested_ack_delay;
+extern unsigned rxrpc_soft_ack_delay;
+extern unsigned rxrpc_idle_ack_delay;
+extern unsigned rxrpc_rx_window_size;
+extern unsigned rxrpc_rx_mtu;
+extern unsigned rxrpc_rx_jumbo_max;
+
+void __rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
+void rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
+void rxrpc_process_call(struct work_struct *);
+
+/*
+ * ar-call.c
+ */
+extern unsigned rxrpc_max_call_lifetime;
+extern unsigned rxrpc_dead_call_expiry;
+extern struct kmem_cache *rxrpc_call_jar;
+extern struct list_head rxrpc_calls;
+extern rwlock_t rxrpc_call_lock;
+
+struct rxrpc_call *rxrpc_find_call_hash(u8, __be32, __be32, __be32,
+ __be16, void *, sa_family_t, const u8 *);
+struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
+ struct rxrpc_transport *,
+ struct rxrpc_conn_bundle *,
+ unsigned long, int, gfp_t);
+struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
+ struct rxrpc_connection *,
+ struct rxrpc_header *, gfp_t);
+struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *, unsigned long);
+void rxrpc_release_call(struct rxrpc_call *);
+void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
+void __rxrpc_put_call(struct rxrpc_call *);
+void __exit rxrpc_destroy_all_calls(void);
+
+/*
+ * ar-connection.c
+ */
+extern unsigned rxrpc_connection_expiry;
+extern struct list_head rxrpc_connections;
+extern rwlock_t rxrpc_connection_lock;
+
+struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
+ struct rxrpc_transport *,
+ struct key *, __be16, gfp_t);
+void rxrpc_put_bundle(struct rxrpc_transport *, struct rxrpc_conn_bundle *);
+int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
+ struct rxrpc_conn_bundle *, struct rxrpc_call *, gfp_t);
+void rxrpc_put_connection(struct rxrpc_connection *);
+void __exit rxrpc_destroy_all_connections(void);
+struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
+ struct rxrpc_header *);
+extern struct rxrpc_connection *
+rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
+ gfp_t);
+
+/*
+ * ar-connevent.c
+ */
+void rxrpc_process_connection(struct work_struct *);
+void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
+void rxrpc_reject_packets(struct work_struct *);
+
+/*
+ * ar-error.c
+ */
+void rxrpc_UDP_error_report(struct sock *);
+void rxrpc_UDP_error_handler(struct work_struct *);
+
+/*
+ * ar-input.c
+ */
+extern const char *rxrpc_pkts[];
+
+void rxrpc_data_ready(struct sock *);
+int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool, bool);
+void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
+
+/*
+ * ar-local.c
+ */
+extern rwlock_t rxrpc_local_lock;
+
+struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
+void rxrpc_put_local(struct rxrpc_local *);
+void __exit rxrpc_destroy_all_locals(void);
+
+/*
+ * ar-key.c
+ */
+extern struct key_type key_type_rxrpc;
+extern struct key_type key_type_rxrpc_s;
+
+int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
+int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
+int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
+ u32);
+
+/*
+ * ar-output.c
+ */
+extern unsigned rxrpc_resend_timeout;
+
+int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
+int rxrpc_client_sendmsg(struct rxrpc_sock *, struct rxrpc_transport *,
+ struct msghdr *, size_t);
+int rxrpc_server_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
+
+/*
+ * ar-peer.c
+ */
+struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
+void rxrpc_put_peer(struct rxrpc_peer *);
+struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *, __be32, __be16);
+void __exit rxrpc_destroy_all_peers(void);
+
+/*
+ * ar-proc.c
+ */
+extern const char *const rxrpc_call_states[];
+extern const struct file_operations rxrpc_call_seq_fops;
+extern const struct file_operations rxrpc_connection_seq_fops;
+
+/*
+ * ar-recvmsg.c
+ */
+void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
+int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
+
+/*
+ * ar-security.c
+ */
+int rxrpc_register_security(struct rxrpc_security *);
+void rxrpc_unregister_security(struct rxrpc_security *);
+int rxrpc_init_client_conn_security(struct rxrpc_connection *);
+int rxrpc_init_server_conn_security(struct rxrpc_connection *);
+int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *, size_t,
+ void *);
+int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *, u32 *);
+void rxrpc_clear_conn_security(struct rxrpc_connection *);
+
+/*
+ * ar-skbuff.c
+ */
+void rxrpc_packet_destructor(struct sk_buff *);
+
+/*
+ * ar-transport.c
+ */
+extern unsigned rxrpc_transport_expiry;
+
+struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
+ struct rxrpc_peer *, gfp_t);
+void rxrpc_put_transport(struct rxrpc_transport *);
+void __exit rxrpc_destroy_all_transports(void);
+struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
+ struct rxrpc_peer *);
+
+/*
+ * sysctl.c
+ */
+#ifdef CONFIG_SYSCTL
+extern int __init rxrpc_sysctl_init(void);
+extern void rxrpc_sysctl_exit(void);
+#else
+static inline int __init rxrpc_sysctl_init(void) { return 0; }
+static inline void rxrpc_sysctl_exit(void) {}
+#endif
+
+/*
+ * debug tracing
+ */
+extern unsigned int rxrpc_debug;
+
+#define dbgprintk(FMT,...) \
+ printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
+
+#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
+#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
+#define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
+#define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
+#define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__)
+
+
+#if defined(__KDEBUG)
+#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
+#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
+#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
+#define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
+#define _net(FMT,...) knet(FMT,##__VA_ARGS__)
+
+#elif defined(CONFIG_AF_RXRPC_DEBUG)
+#define RXRPC_DEBUG_KENTER 0x01
+#define RXRPC_DEBUG_KLEAVE 0x02
+#define RXRPC_DEBUG_KDEBUG 0x04
+#define RXRPC_DEBUG_KPROTO 0x08
+#define RXRPC_DEBUG_KNET 0x10
+
+#define _enter(FMT,...) \
+do { \
+ if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
+ kenter(FMT,##__VA_ARGS__); \
+} while (0)
+
+#define _leave(FMT,...) \
+do { \
+ if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
+ kleave(FMT,##__VA_ARGS__); \
+} while (0)
+
+#define _debug(FMT,...) \
+do { \
+ if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
+ kdebug(FMT,##__VA_ARGS__); \
+} while (0)
+
+#define _proto(FMT,...) \
+do { \
+ if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
+ kproto(FMT,##__VA_ARGS__); \
+} while (0)
+
+#define _net(FMT,...) \
+do { \
+ if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \
+ knet(FMT,##__VA_ARGS__); \
+} while (0)
+
+#else
+#define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
+#define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
+#define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
+#define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
+#define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__)
+#endif
+
+/*
+ * debug assertion checking
+ */
+#if 1 // defined(__KDEBUGALL)
+
+#define ASSERT(X) \
+do { \
+ if (unlikely(!(X))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "RxRPC: Assertion failed\n"); \
+ BUG(); \
+ } \
+} while(0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+ if (unlikely(!((X) OP (Y)))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "RxRPC: Assertion failed\n"); \
+ printk(KERN_ERR "%lu " #OP " %lu is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while(0)
+
+#define ASSERTIF(C, X) \
+do { \
+ if (unlikely((C) && !(X))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "RxRPC: Assertion failed\n"); \
+ BUG(); \
+ } \
+} while(0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+ if (unlikely((C) && !((X) OP (Y)))) { \
+ printk(KERN_ERR "\n"); \
+ printk(KERN_ERR "RxRPC: Assertion failed\n"); \
+ printk(KERN_ERR "%lu " #OP " %lu is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n", \
+ (unsigned long)(X), (unsigned long)(Y)); \
+ BUG(); \
+ } \
+} while(0)
+
+#else
+
+#define ASSERT(X) \
+do { \
+} while(0)
+
+#define ASSERTCMP(X, OP, Y) \
+do { \
+} while(0)
+
+#define ASSERTIF(C, X) \
+do { \
+} while(0)
+
+#define ASSERTIFCMP(C, X, OP, Y) \
+do { \
+} while(0)
+
+#endif /* __KDEBUGALL */
+
+/*
+ * socket buffer accounting / leak finding
+ */
+static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
+{
+ //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
+ //atomic_inc(&rxrpc_n_skbs);
+}
+
+#define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
+
+static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
+{
+ //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
+ //atomic_dec(&rxrpc_n_skbs);
+}
+
+#define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
+
+static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
+{
+ if (skb) {
+ CHECK_SLAB_OKAY(&skb->users);
+ //_net("free skb %p %s [%d]",
+ // skb, fn, atomic_read(&rxrpc_n_skbs));
+ //atomic_dec(&rxrpc_n_skbs);
+ kfree_skb(skb);
+ }
+}
+
+#define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
+
+static inline void rxrpc_purge_queue(struct sk_buff_head *list)
+{
+ struct sk_buff *skb;
+ while ((skb = skb_dequeue((list))) != NULL)
+ rxrpc_free_skb(skb);
+}
+
+static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
+{
+ CHECK_SLAB_OKAY(&local->usage);
+ if (atomic_inc_return(&local->usage) == 1)
+ printk("resurrected (%s)\n", f);
+}
+
+#define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
+
+#define rxrpc_get_call(CALL) \
+do { \
+ CHECK_SLAB_OKAY(&(CALL)->usage); \
+ if (atomic_inc_return(&(CALL)->usage) == 1) \
+ BUG(); \
+} while(0)
+
+#define rxrpc_put_call(CALL) \
+do { \
+ __rxrpc_put_call(CALL); \
+} while(0)
diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c
new file mode 100644
index 000000000..db0f39f5e
--- /dev/null
+++ b/net/rxrpc/ar-key.c
@@ -0,0 +1,1247 @@
+/* RxRPC key management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * RxRPC keys should have a description of describing their purpose:
+ * "afs@CAMBRIDGE.REDHAT.COM>
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/key-type.h>
+#include <linux/crypto.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <keys/rxrpc-type.h>
+#include <keys/user-type.h>
+#include "ar-internal.h"
+
+static int rxrpc_vet_description_s(const char *);
+static int rxrpc_preparse(struct key_preparsed_payload *);
+static int rxrpc_preparse_s(struct key_preparsed_payload *);
+static void rxrpc_free_preparse(struct key_preparsed_payload *);
+static void rxrpc_free_preparse_s(struct key_preparsed_payload *);
+static void rxrpc_destroy(struct key *);
+static void rxrpc_destroy_s(struct key *);
+static void rxrpc_describe(const struct key *, struct seq_file *);
+static long rxrpc_read(const struct key *, char __user *, size_t);
+
+/*
+ * rxrpc defined keys take an arbitrary string as the description and an
+ * arbitrary blob of data as the payload
+ */
+struct key_type key_type_rxrpc = {
+ .name = "rxrpc",
+ .preparse = rxrpc_preparse,
+ .free_preparse = rxrpc_free_preparse,
+ .instantiate = generic_key_instantiate,
+ .destroy = rxrpc_destroy,
+ .describe = rxrpc_describe,
+ .read = rxrpc_read,
+};
+EXPORT_SYMBOL(key_type_rxrpc);
+
+/*
+ * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the
+ * description and an 8-byte decryption key as the payload
+ */
+struct key_type key_type_rxrpc_s = {
+ .name = "rxrpc_s",
+ .vet_description = rxrpc_vet_description_s,
+ .preparse = rxrpc_preparse_s,
+ .free_preparse = rxrpc_free_preparse_s,
+ .instantiate = generic_key_instantiate,
+ .destroy = rxrpc_destroy_s,
+ .describe = rxrpc_describe,
+};
+
+/*
+ * Vet the description for an RxRPC server key
+ */
+static int rxrpc_vet_description_s(const char *desc)
+{
+ unsigned long num;
+ char *p;
+
+ num = simple_strtoul(desc, &p, 10);
+ if (*p != ':' || num > 65535)
+ return -EINVAL;
+ num = simple_strtoul(p + 1, &p, 10);
+ if (*p || num < 1 || num > 255)
+ return -EINVAL;
+ return 0;
+}
+
+/*
+ * parse an RxKAD type XDR format token
+ * - the caller guarantees we have at least 4 words
+ */
+static int rxrpc_preparse_xdr_rxkad(struct key_preparsed_payload *prep,
+ size_t datalen,
+ const __be32 *xdr, unsigned int toklen)
+{
+ struct rxrpc_key_token *token, **pptoken;
+ size_t plen;
+ u32 tktlen;
+
+ _enter(",{%x,%x,%x,%x},%u",
+ ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
+ toklen);
+
+ if (toklen <= 8 * 4)
+ return -EKEYREJECTED;
+ tktlen = ntohl(xdr[7]);
+ _debug("tktlen: %x", tktlen);
+ if (tktlen > AFSTOKEN_RK_TIX_MAX)
+ return -EKEYREJECTED;
+ if (toklen < 8 * 4 + tktlen)
+ return -EKEYREJECTED;
+
+ plen = sizeof(*token) + sizeof(*token->kad) + tktlen;
+ prep->quotalen = datalen + plen;
+
+ plen -= sizeof(*token);
+ token = kzalloc(sizeof(*token), GFP_KERNEL);
+ if (!token)
+ return -ENOMEM;
+
+ token->kad = kzalloc(plen, GFP_KERNEL);
+ if (!token->kad) {
+ kfree(token);
+ return -ENOMEM;
+ }
+
+ token->security_index = RXRPC_SECURITY_RXKAD;
+ token->kad->ticket_len = tktlen;
+ token->kad->vice_id = ntohl(xdr[0]);
+ token->kad->kvno = ntohl(xdr[1]);
+ token->kad->start = ntohl(xdr[4]);
+ token->kad->expiry = ntohl(xdr[5]);
+ token->kad->primary_flag = ntohl(xdr[6]);
+ memcpy(&token->kad->session_key, &xdr[2], 8);
+ memcpy(&token->kad->ticket, &xdr[8], tktlen);
+
+ _debug("SCIX: %u", token->security_index);
+ _debug("TLEN: %u", token->kad->ticket_len);
+ _debug("EXPY: %x", token->kad->expiry);
+ _debug("KVNO: %u", token->kad->kvno);
+ _debug("PRIM: %u", token->kad->primary_flag);
+ _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
+ token->kad->session_key[0], token->kad->session_key[1],
+ token->kad->session_key[2], token->kad->session_key[3],
+ token->kad->session_key[4], token->kad->session_key[5],
+ token->kad->session_key[6], token->kad->session_key[7]);
+ if (token->kad->ticket_len >= 8)
+ _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
+ token->kad->ticket[0], token->kad->ticket[1],
+ token->kad->ticket[2], token->kad->ticket[3],
+ token->kad->ticket[4], token->kad->ticket[5],
+ token->kad->ticket[6], token->kad->ticket[7]);
+
+ /* count the number of tokens attached */
+ prep->type_data[0] = (void *)((unsigned long)prep->type_data[0] + 1);
+
+ /* attach the data */
+ for (pptoken = (struct rxrpc_key_token **)&prep->payload[0];
+ *pptoken;
+ pptoken = &(*pptoken)->next)
+ continue;
+ *pptoken = token;
+ if (token->kad->expiry < prep->expiry)
+ prep->expiry = token->kad->expiry;
+
+ _leave(" = 0");
+ return 0;
+}
+
+static void rxrpc_free_krb5_principal(struct krb5_principal *princ)
+{
+ int loop;
+
+ if (princ->name_parts) {
+ for (loop = princ->n_name_parts - 1; loop >= 0; loop--)
+ kfree(princ->name_parts[loop]);
+ kfree(princ->name_parts);
+ }
+ kfree(princ->realm);
+}
+
+static void rxrpc_free_krb5_tagged(struct krb5_tagged_data *td)
+{
+ kfree(td->data);
+}
+
+/*
+ * free up an RxK5 token
+ */
+static void rxrpc_rxk5_free(struct rxk5_key *rxk5)
+{
+ int loop;
+
+ rxrpc_free_krb5_principal(&rxk5->client);
+ rxrpc_free_krb5_principal(&rxk5->server);
+ rxrpc_free_krb5_tagged(&rxk5->session);
+
+ if (rxk5->addresses) {
+ for (loop = rxk5->n_addresses - 1; loop >= 0; loop--)
+ rxrpc_free_krb5_tagged(&rxk5->addresses[loop]);
+ kfree(rxk5->addresses);
+ }
+ if (rxk5->authdata) {
+ for (loop = rxk5->n_authdata - 1; loop >= 0; loop--)
+ rxrpc_free_krb5_tagged(&rxk5->authdata[loop]);
+ kfree(rxk5->authdata);
+ }
+
+ kfree(rxk5->ticket);
+ kfree(rxk5->ticket2);
+ kfree(rxk5);
+}
+
+/*
+ * extract a krb5 principal
+ */
+static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
+ const __be32 **_xdr,
+ unsigned int *_toklen)
+{
+ const __be32 *xdr = *_xdr;
+ unsigned int toklen = *_toklen, n_parts, loop, tmp;
+
+ /* there must be at least one name, and at least #names+1 length
+ * words */
+ if (toklen <= 12)
+ return -EINVAL;
+
+ _enter(",{%x,%x,%x},%u",
+ ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), toklen);
+
+ n_parts = ntohl(*xdr++);
+ toklen -= 4;
+ if (n_parts <= 0 || n_parts > AFSTOKEN_K5_COMPONENTS_MAX)
+ return -EINVAL;
+ princ->n_name_parts = n_parts;
+
+ if (toklen <= (n_parts + 1) * 4)
+ return -EINVAL;
+
+ princ->name_parts = kcalloc(n_parts, sizeof(char *), GFP_KERNEL);
+ if (!princ->name_parts)
+ return -ENOMEM;
+
+ for (loop = 0; loop < n_parts; loop++) {
+ if (toklen < 4)
+ return -EINVAL;
+ tmp = ntohl(*xdr++);
+ toklen -= 4;
+ if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX)
+ return -EINVAL;
+ if (tmp > toklen)
+ return -EINVAL;
+ princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL);
+ if (!princ->name_parts[loop])
+ return -ENOMEM;
+ memcpy(princ->name_parts[loop], xdr, tmp);
+ princ->name_parts[loop][tmp] = 0;
+ tmp = (tmp + 3) & ~3;
+ toklen -= tmp;
+ xdr += tmp >> 2;
+ }
+
+ if (toklen < 4)
+ return -EINVAL;
+ tmp = ntohl(*xdr++);
+ toklen -= 4;
+ if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX)
+ return -EINVAL;
+ if (tmp > toklen)
+ return -EINVAL;
+ princ->realm = kmalloc(tmp + 1, GFP_KERNEL);
+ if (!princ->realm)
+ return -ENOMEM;
+ memcpy(princ->realm, xdr, tmp);
+ princ->realm[tmp] = 0;
+ tmp = (tmp + 3) & ~3;
+ toklen -= tmp;
+ xdr += tmp >> 2;
+
+ _debug("%s/...@%s", princ->name_parts[0], princ->realm);
+
+ *_xdr = xdr;
+ *_toklen = toklen;
+ _leave(" = 0 [toklen=%u]", toklen);
+ return 0;
+}
+
+/*
+ * extract a piece of krb5 tagged data
+ */
+static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
+ size_t max_data_size,
+ const __be32 **_xdr,
+ unsigned int *_toklen)
+{
+ const __be32 *xdr = *_xdr;
+ unsigned int toklen = *_toklen, len;
+
+ /* there must be at least one tag and one length word */
+ if (toklen <= 8)
+ return -EINVAL;
+
+ _enter(",%zu,{%x,%x},%u",
+ max_data_size, ntohl(xdr[0]), ntohl(xdr[1]), toklen);
+
+ td->tag = ntohl(*xdr++);
+ len = ntohl(*xdr++);
+ toklen -= 8;
+ if (len > max_data_size)
+ return -EINVAL;
+ td->data_len = len;
+
+ if (len > 0) {
+ td->data = kmemdup(xdr, len, GFP_KERNEL);
+ if (!td->data)
+ return -ENOMEM;
+ len = (len + 3) & ~3;
+ toklen -= len;
+ xdr += len >> 2;
+ }
+
+ _debug("tag %x len %x", td->tag, td->data_len);
+
+ *_xdr = xdr;
+ *_toklen = toklen;
+ _leave(" = 0 [toklen=%u]", toklen);
+ return 0;
+}
+
+/*
+ * extract an array of tagged data
+ */
+static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td,
+ u8 *_n_elem,
+ u8 max_n_elem,
+ size_t max_elem_size,
+ const __be32 **_xdr,
+ unsigned int *_toklen)
+{
+ struct krb5_tagged_data *td;
+ const __be32 *xdr = *_xdr;
+ unsigned int toklen = *_toklen, n_elem, loop;
+ int ret;
+
+ /* there must be at least one count */
+ if (toklen < 4)
+ return -EINVAL;
+
+ _enter(",,%u,%zu,{%x},%u",
+ max_n_elem, max_elem_size, ntohl(xdr[0]), toklen);
+
+ n_elem = ntohl(*xdr++);
+ toklen -= 4;
+ if (n_elem > max_n_elem)
+ return -EINVAL;
+ *_n_elem = n_elem;
+ if (n_elem > 0) {
+ if (toklen <= (n_elem + 1) * 4)
+ return -EINVAL;
+
+ _debug("n_elem %d", n_elem);
+
+ td = kcalloc(n_elem, sizeof(struct krb5_tagged_data),
+ GFP_KERNEL);
+ if (!td)
+ return -ENOMEM;
+ *_td = td;
+
+ for (loop = 0; loop < n_elem; loop++) {
+ ret = rxrpc_krb5_decode_tagged_data(&td[loop],
+ max_elem_size,
+ &xdr, &toklen);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ *_xdr = xdr;
+ *_toklen = toklen;
+ _leave(" = 0 [toklen=%u]", toklen);
+ return 0;
+}
+
+/*
+ * extract a krb5 ticket
+ */
+static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
+ const __be32 **_xdr, unsigned int *_toklen)
+{
+ const __be32 *xdr = *_xdr;
+ unsigned int toklen = *_toklen, len;
+
+ /* there must be at least one length word */
+ if (toklen <= 4)
+ return -EINVAL;
+
+ _enter(",{%x},%u", ntohl(xdr[0]), toklen);
+
+ len = ntohl(*xdr++);
+ toklen -= 4;
+ if (len > AFSTOKEN_K5_TIX_MAX)
+ return -EINVAL;
+ *_tktlen = len;
+
+ _debug("ticket len %u", len);
+
+ if (len > 0) {
+ *_ticket = kmemdup(xdr, len, GFP_KERNEL);
+ if (!*_ticket)
+ return -ENOMEM;
+ len = (len + 3) & ~3;
+ toklen -= len;
+ xdr += len >> 2;
+ }
+
+ *_xdr = xdr;
+ *_toklen = toklen;
+ _leave(" = 0 [toklen=%u]", toklen);
+ return 0;
+}
+
+/*
+ * parse an RxK5 type XDR format token
+ * - the caller guarantees we have at least 4 words
+ */
+static int rxrpc_preparse_xdr_rxk5(struct key_preparsed_payload *prep,
+ size_t datalen,
+ const __be32 *xdr, unsigned int toklen)
+{
+ struct rxrpc_key_token *token, **pptoken;
+ struct rxk5_key *rxk5;
+ const __be32 *end_xdr = xdr + (toklen >> 2);
+ int ret;
+
+ _enter(",{%x,%x,%x,%x},%u",
+ ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
+ toklen);
+
+ /* reserve some payload space for this subkey - the length of the token
+ * is a reasonable approximation */
+ prep->quotalen = datalen + toklen;
+
+ token = kzalloc(sizeof(*token), GFP_KERNEL);
+ if (!token)
+ return -ENOMEM;
+
+ rxk5 = kzalloc(sizeof(*rxk5), GFP_KERNEL);
+ if (!rxk5) {
+ kfree(token);
+ return -ENOMEM;
+ }
+
+ token->security_index = RXRPC_SECURITY_RXK5;
+ token->k5 = rxk5;
+
+ /* extract the principals */
+ ret = rxrpc_krb5_decode_principal(&rxk5->client, &xdr, &toklen);
+ if (ret < 0)
+ goto error;
+ ret = rxrpc_krb5_decode_principal(&rxk5->server, &xdr, &toklen);
+ if (ret < 0)
+ goto error;
+
+ /* extract the session key and the encoding type (the tag field ->
+ * ENCTYPE_xxx) */
+ ret = rxrpc_krb5_decode_tagged_data(&rxk5->session, AFSTOKEN_DATA_MAX,
+ &xdr, &toklen);
+ if (ret < 0)
+ goto error;
+
+ if (toklen < 4 * 8 + 2 * 4)
+ goto inval;
+ rxk5->authtime = be64_to_cpup((const __be64 *) xdr);
+ xdr += 2;
+ rxk5->starttime = be64_to_cpup((const __be64 *) xdr);
+ xdr += 2;
+ rxk5->endtime = be64_to_cpup((const __be64 *) xdr);
+ xdr += 2;
+ rxk5->renew_till = be64_to_cpup((const __be64 *) xdr);
+ xdr += 2;
+ rxk5->is_skey = ntohl(*xdr++);
+ rxk5->flags = ntohl(*xdr++);
+ toklen -= 4 * 8 + 2 * 4;
+
+ _debug("times: a=%llx s=%llx e=%llx rt=%llx",
+ rxk5->authtime, rxk5->starttime, rxk5->endtime,
+ rxk5->renew_till);
+ _debug("is_skey=%x flags=%x", rxk5->is_skey, rxk5->flags);
+
+ /* extract the permitted client addresses */
+ ret = rxrpc_krb5_decode_tagged_array(&rxk5->addresses,
+ &rxk5->n_addresses,
+ AFSTOKEN_K5_ADDRESSES_MAX,
+ AFSTOKEN_DATA_MAX,
+ &xdr, &toklen);
+ if (ret < 0)
+ goto error;
+
+ ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
+
+ /* extract the tickets */
+ ret = rxrpc_krb5_decode_ticket(&rxk5->ticket, &rxk5->ticket_len,
+ &xdr, &toklen);
+ if (ret < 0)
+ goto error;
+ ret = rxrpc_krb5_decode_ticket(&rxk5->ticket2, &rxk5->ticket2_len,
+ &xdr, &toklen);
+ if (ret < 0)
+ goto error;
+
+ ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
+
+ /* extract the typed auth data */
+ ret = rxrpc_krb5_decode_tagged_array(&rxk5->authdata,
+ &rxk5->n_authdata,
+ AFSTOKEN_K5_AUTHDATA_MAX,
+ AFSTOKEN_BDATALN_MAX,
+ &xdr, &toklen);
+ if (ret < 0)
+ goto error;
+
+ ASSERTCMP((end_xdr - xdr) << 2, ==, toklen);
+
+ if (toklen != 0)
+ goto inval;
+
+ /* attach the payload */
+ for (pptoken = (struct rxrpc_key_token **)&prep->payload[0];
+ *pptoken;
+ pptoken = &(*pptoken)->next)
+ continue;
+ *pptoken = token;
+ if (token->kad->expiry < prep->expiry)
+ prep->expiry = token->kad->expiry;
+
+ _leave(" = 0");
+ return 0;
+
+inval:
+ ret = -EINVAL;
+error:
+ rxrpc_rxk5_free(rxk5);
+ kfree(token);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * attempt to parse the data as the XDR format
+ * - the caller guarantees we have more than 7 words
+ */
+static int rxrpc_preparse_xdr(struct key_preparsed_payload *prep)
+{
+ const __be32 *xdr = prep->data, *token;
+ const char *cp;
+ unsigned int len, tmp, loop, ntoken, toklen, sec_ix;
+ size_t datalen = prep->datalen;
+ int ret;
+
+ _enter(",{%x,%x,%x,%x},%zu",
+ ntohl(xdr[0]), ntohl(xdr[1]), ntohl(xdr[2]), ntohl(xdr[3]),
+ prep->datalen);
+
+ if (datalen > AFSTOKEN_LENGTH_MAX)
+ goto not_xdr;
+
+ /* XDR is an array of __be32's */
+ if (datalen & 3)
+ goto not_xdr;
+
+ /* the flags should be 0 (the setpag bit must be handled by
+ * userspace) */
+ if (ntohl(*xdr++) != 0)
+ goto not_xdr;
+ datalen -= 4;
+
+ /* check the cell name */
+ len = ntohl(*xdr++);
+ if (len < 1 || len > AFSTOKEN_CELL_MAX)
+ goto not_xdr;
+ datalen -= 4;
+ tmp = (len + 3) & ~3;
+ if (tmp > datalen)
+ goto not_xdr;
+
+ cp = (const char *) xdr;
+ for (loop = 0; loop < len; loop++)
+ if (!isprint(cp[loop]))
+ goto not_xdr;
+ if (len < tmp)
+ for (; loop < tmp; loop++)
+ if (cp[loop])
+ goto not_xdr;
+ _debug("cellname: [%u/%u] '%*.*s'",
+ len, tmp, len, len, (const char *) xdr);
+ datalen -= tmp;
+ xdr += tmp >> 2;
+
+ /* get the token count */
+ if (datalen < 12)
+ goto not_xdr;
+ ntoken = ntohl(*xdr++);
+ datalen -= 4;
+ _debug("ntoken: %x", ntoken);
+ if (ntoken < 1 || ntoken > AFSTOKEN_MAX)
+ goto not_xdr;
+
+ /* check each token wrapper */
+ token = xdr;
+ loop = ntoken;
+ do {
+ if (datalen < 8)
+ goto not_xdr;
+ toklen = ntohl(*xdr++);
+ sec_ix = ntohl(*xdr);
+ datalen -= 4;
+ _debug("token: [%x/%zx] %x", toklen, datalen, sec_ix);
+ if (toklen < 20 || toklen > datalen)
+ goto not_xdr;
+ datalen -= (toklen + 3) & ~3;
+ xdr += (toklen + 3) >> 2;
+
+ } while (--loop > 0);
+
+ _debug("remainder: %zu", datalen);
+ if (datalen != 0)
+ goto not_xdr;
+
+ /* okay: we're going to assume it's valid XDR format
+ * - we ignore the cellname, relying on the key to be correctly named
+ */
+ do {
+ xdr = token;
+ toklen = ntohl(*xdr++);
+ token = xdr + ((toklen + 3) >> 2);
+ sec_ix = ntohl(*xdr++);
+ toklen -= 4;
+
+ _debug("TOKEN type=%u [%p-%p]", sec_ix, xdr, token);
+
+ switch (sec_ix) {
+ case RXRPC_SECURITY_RXKAD:
+ ret = rxrpc_preparse_xdr_rxkad(prep, datalen, xdr, toklen);
+ if (ret != 0)
+ goto error;
+ break;
+
+ case RXRPC_SECURITY_RXK5:
+ ret = rxrpc_preparse_xdr_rxk5(prep, datalen, xdr, toklen);
+ if (ret != 0)
+ goto error;
+ break;
+
+ default:
+ ret = -EPROTONOSUPPORT;
+ goto error;
+ }
+
+ } while (--ntoken > 0);
+
+ _leave(" = 0");
+ return 0;
+
+not_xdr:
+ _leave(" = -EPROTO");
+ return -EPROTO;
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Preparse an rxrpc defined key.
+ *
+ * Data should be of the form:
+ * OFFSET LEN CONTENT
+ * 0 4 key interface version number
+ * 4 2 security index (type)
+ * 6 2 ticket length
+ * 8 4 key expiry time (time_t)
+ * 12 4 kvno
+ * 16 8 session key
+ * 24 [len] ticket
+ *
+ * if no data is provided, then a no-security key is made
+ */
+static int rxrpc_preparse(struct key_preparsed_payload *prep)
+{
+ const struct rxrpc_key_data_v1 *v1;
+ struct rxrpc_key_token *token, **pp;
+ size_t plen;
+ u32 kver;
+ int ret;
+
+ _enter("%zu", prep->datalen);
+
+ /* handle a no-security key */
+ if (!prep->data && prep->datalen == 0)
+ return 0;
+
+ /* determine if the XDR payload format is being used */
+ if (prep->datalen > 7 * 4) {
+ ret = rxrpc_preparse_xdr(prep);
+ if (ret != -EPROTO)
+ return ret;
+ }
+
+ /* get the key interface version number */
+ ret = -EINVAL;
+ if (prep->datalen <= 4 || !prep->data)
+ goto error;
+ memcpy(&kver, prep->data, sizeof(kver));
+ prep->data += sizeof(kver);
+ prep->datalen -= sizeof(kver);
+
+ _debug("KEY I/F VERSION: %u", kver);
+
+ ret = -EKEYREJECTED;
+ if (kver != 1)
+ goto error;
+
+ /* deal with a version 1 key */
+ ret = -EINVAL;
+ if (prep->datalen < sizeof(*v1))
+ goto error;
+
+ v1 = prep->data;
+ if (prep->datalen != sizeof(*v1) + v1->ticket_length)
+ goto error;
+
+ _debug("SCIX: %u", v1->security_index);
+ _debug("TLEN: %u", v1->ticket_length);
+ _debug("EXPY: %x", v1->expiry);
+ _debug("KVNO: %u", v1->kvno);
+ _debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
+ v1->session_key[0], v1->session_key[1],
+ v1->session_key[2], v1->session_key[3],
+ v1->session_key[4], v1->session_key[5],
+ v1->session_key[6], v1->session_key[7]);
+ if (v1->ticket_length >= 8)
+ _debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
+ v1->ticket[0], v1->ticket[1],
+ v1->ticket[2], v1->ticket[3],
+ v1->ticket[4], v1->ticket[5],
+ v1->ticket[6], v1->ticket[7]);
+
+ ret = -EPROTONOSUPPORT;
+ if (v1->security_index != RXRPC_SECURITY_RXKAD)
+ goto error;
+
+ plen = sizeof(*token->kad) + v1->ticket_length;
+ prep->quotalen = plen + sizeof(*token);
+
+ ret = -ENOMEM;
+ token = kzalloc(sizeof(*token), GFP_KERNEL);
+ if (!token)
+ goto error;
+ token->kad = kzalloc(plen, GFP_KERNEL);
+ if (!token->kad)
+ goto error_free;
+
+ token->security_index = RXRPC_SECURITY_RXKAD;
+ token->kad->ticket_len = v1->ticket_length;
+ token->kad->expiry = v1->expiry;
+ token->kad->kvno = v1->kvno;
+ memcpy(&token->kad->session_key, &v1->session_key, 8);
+ memcpy(&token->kad->ticket, v1->ticket, v1->ticket_length);
+
+ /* count the number of tokens attached */
+ prep->type_data[0] = (void *)((unsigned long)prep->type_data[0] + 1);
+
+ /* attach the data */
+ pp = (struct rxrpc_key_token **)&prep->payload[0];
+ while (*pp)
+ pp = &(*pp)->next;
+ *pp = token;
+ if (token->kad->expiry < prep->expiry)
+ prep->expiry = token->kad->expiry;
+ token = NULL;
+ ret = 0;
+
+error_free:
+ kfree(token);
+error:
+ return ret;
+}
+
+/*
+ * Free token list.
+ */
+static void rxrpc_free_token_list(struct rxrpc_key_token *token)
+{
+ struct rxrpc_key_token *next;
+
+ for (; token; token = next) {
+ next = token->next;
+ switch (token->security_index) {
+ case RXRPC_SECURITY_RXKAD:
+ kfree(token->kad);
+ break;
+ case RXRPC_SECURITY_RXK5:
+ if (token->k5)
+ rxrpc_rxk5_free(token->k5);
+ break;
+ default:
+ printk(KERN_ERR "Unknown token type %x on rxrpc key\n",
+ token->security_index);
+ BUG();
+ }
+
+ kfree(token);
+ }
+}
+
+/*
+ * Clean up preparse data.
+ */
+static void rxrpc_free_preparse(struct key_preparsed_payload *prep)
+{
+ rxrpc_free_token_list(prep->payload[0]);
+}
+
+/*
+ * Preparse a server secret key.
+ *
+ * The data should be the 8-byte secret key.
+ */
+static int rxrpc_preparse_s(struct key_preparsed_payload *prep)
+{
+ struct crypto_blkcipher *ci;
+
+ _enter("%zu", prep->datalen);
+
+ if (prep->datalen != 8)
+ return -EINVAL;
+
+ memcpy(&prep->type_data, prep->data, 8);
+
+ ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(ci)) {
+ _leave(" = %ld", PTR_ERR(ci));
+ return PTR_ERR(ci);
+ }
+
+ if (crypto_blkcipher_setkey(ci, prep->data, 8) < 0)
+ BUG();
+
+ prep->payload[0] = ci;
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * Clean up preparse data.
+ */
+static void rxrpc_free_preparse_s(struct key_preparsed_payload *prep)
+{
+ if (prep->payload[0])
+ crypto_free_blkcipher(prep->payload[0]);
+}
+
+/*
+ * dispose of the data dangling from the corpse of a rxrpc key
+ */
+static void rxrpc_destroy(struct key *key)
+{
+ rxrpc_free_token_list(key->payload.data);
+}
+
+/*
+ * dispose of the data dangling from the corpse of a rxrpc key
+ */
+static void rxrpc_destroy_s(struct key *key)
+{
+ if (key->payload.data) {
+ crypto_free_blkcipher(key->payload.data);
+ key->payload.data = NULL;
+ }
+}
+
+/*
+ * describe the rxrpc key
+ */
+static void rxrpc_describe(const struct key *key, struct seq_file *m)
+{
+ seq_puts(m, key->description);
+}
+
+/*
+ * grab the security key for a socket
+ */
+int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
+{
+ struct key *key;
+ char *description;
+
+ _enter("");
+
+ if (optlen <= 0 || optlen > PAGE_SIZE - 1)
+ return -EINVAL;
+
+ description = kmalloc(optlen + 1, GFP_KERNEL);
+ if (!description)
+ return -ENOMEM;
+
+ if (copy_from_user(description, optval, optlen)) {
+ kfree(description);
+ return -EFAULT;
+ }
+ description[optlen] = 0;
+
+ key = request_key(&key_type_rxrpc, description, NULL);
+ if (IS_ERR(key)) {
+ kfree(description);
+ _leave(" = %ld", PTR_ERR(key));
+ return PTR_ERR(key);
+ }
+
+ rx->key = key;
+ kfree(description);
+ _leave(" = 0 [key %x]", key->serial);
+ return 0;
+}
+
+/*
+ * grab the security keyring for a server socket
+ */
+int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
+ int optlen)
+{
+ struct key *key;
+ char *description;
+
+ _enter("");
+
+ if (optlen <= 0 || optlen > PAGE_SIZE - 1)
+ return -EINVAL;
+
+ description = kmalloc(optlen + 1, GFP_KERNEL);
+ if (!description)
+ return -ENOMEM;
+
+ if (copy_from_user(description, optval, optlen)) {
+ kfree(description);
+ return -EFAULT;
+ }
+ description[optlen] = 0;
+
+ key = request_key(&key_type_keyring, description, NULL);
+ if (IS_ERR(key)) {
+ kfree(description);
+ _leave(" = %ld", PTR_ERR(key));
+ return PTR_ERR(key);
+ }
+
+ rx->securities = key;
+ kfree(description);
+ _leave(" = 0 [key %x]", key->serial);
+ return 0;
+}
+
+/*
+ * generate a server data key
+ */
+int rxrpc_get_server_data_key(struct rxrpc_connection *conn,
+ const void *session_key,
+ time_t expiry,
+ u32 kvno)
+{
+ const struct cred *cred = current_cred();
+ struct key *key;
+ int ret;
+
+ struct {
+ u32 kver;
+ struct rxrpc_key_data_v1 v1;
+ } data;
+
+ _enter("");
+
+ key = key_alloc(&key_type_rxrpc, "x",
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 0,
+ KEY_ALLOC_NOT_IN_QUOTA);
+ if (IS_ERR(key)) {
+ _leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key));
+ return -ENOMEM;
+ }
+
+ _debug("key %d", key_serial(key));
+
+ data.kver = 1;
+ data.v1.security_index = RXRPC_SECURITY_RXKAD;
+ data.v1.ticket_length = 0;
+ data.v1.expiry = expiry;
+ data.v1.kvno = 0;
+
+ memcpy(&data.v1.session_key, session_key, sizeof(data.v1.session_key));
+
+ ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL);
+ if (ret < 0)
+ goto error;
+
+ conn->key = key;
+ _leave(" = 0 [%d]", key_serial(key));
+ return 0;
+
+error:
+ key_revoke(key);
+ key_put(key);
+ _leave(" = -ENOMEM [ins %d]", ret);
+ return -ENOMEM;
+}
+EXPORT_SYMBOL(rxrpc_get_server_data_key);
+
+/**
+ * rxrpc_get_null_key - Generate a null RxRPC key
+ * @keyname: The name to give the key.
+ *
+ * Generate a null RxRPC key that can be used to indicate anonymous security is
+ * required for a particular domain.
+ */
+struct key *rxrpc_get_null_key(const char *keyname)
+{
+ const struct cred *cred = current_cred();
+ struct key *key;
+ int ret;
+
+ key = key_alloc(&key_type_rxrpc, keyname,
+ GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
+ KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA);
+ if (IS_ERR(key))
+ return key;
+
+ ret = key_instantiate_and_link(key, NULL, 0, NULL, NULL);
+ if (ret < 0) {
+ key_revoke(key);
+ key_put(key);
+ return ERR_PTR(ret);
+ }
+
+ return key;
+}
+EXPORT_SYMBOL(rxrpc_get_null_key);
+
+/*
+ * read the contents of an rxrpc key
+ * - this returns the result in XDR form
+ */
+static long rxrpc_read(const struct key *key,
+ char __user *buffer, size_t buflen)
+{
+ const struct rxrpc_key_token *token;
+ const struct krb5_principal *princ;
+ size_t size;
+ __be32 __user *xdr, *oldxdr;
+ u32 cnlen, toksize, ntoks, tok, zero;
+ u16 toksizes[AFSTOKEN_MAX];
+ int loop;
+
+ _enter("");
+
+ /* we don't know what form we should return non-AFS keys in */
+ if (memcmp(key->description, "afs@", 4) != 0)
+ return -EOPNOTSUPP;
+ cnlen = strlen(key->description + 4);
+
+#define RND(X) (((X) + 3) & ~3)
+
+ /* AFS keys we return in XDR form, so we need to work out the size of
+ * the XDR */
+ size = 2 * 4; /* flags, cellname len */
+ size += RND(cnlen); /* cellname */
+ size += 1 * 4; /* token count */
+
+ ntoks = 0;
+ for (token = key->payload.data; token; token = token->next) {
+ toksize = 4; /* sec index */
+
+ switch (token->security_index) {
+ case RXRPC_SECURITY_RXKAD:
+ toksize += 8 * 4; /* viceid, kvno, key*2, begin,
+ * end, primary, tktlen */
+ toksize += RND(token->kad->ticket_len);
+ break;
+
+ case RXRPC_SECURITY_RXK5:
+ princ = &token->k5->client;
+ toksize += 4 + princ->n_name_parts * 4;
+ for (loop = 0; loop < princ->n_name_parts; loop++)
+ toksize += RND(strlen(princ->name_parts[loop]));
+ toksize += 4 + RND(strlen(princ->realm));
+
+ princ = &token->k5->server;
+ toksize += 4 + princ->n_name_parts * 4;
+ for (loop = 0; loop < princ->n_name_parts; loop++)
+ toksize += RND(strlen(princ->name_parts[loop]));
+ toksize += 4 + RND(strlen(princ->realm));
+
+ toksize += 8 + RND(token->k5->session.data_len);
+
+ toksize += 4 * 8 + 2 * 4;
+
+ toksize += 4 + token->k5->n_addresses * 8;
+ for (loop = 0; loop < token->k5->n_addresses; loop++)
+ toksize += RND(token->k5->addresses[loop].data_len);
+
+ toksize += 4 + RND(token->k5->ticket_len);
+ toksize += 4 + RND(token->k5->ticket2_len);
+
+ toksize += 4 + token->k5->n_authdata * 8;
+ for (loop = 0; loop < token->k5->n_authdata; loop++)
+ toksize += RND(token->k5->authdata[loop].data_len);
+ break;
+
+ default: /* we have a ticket we can't encode */
+ BUG();
+ continue;
+ }
+
+ _debug("token[%u]: toksize=%u", ntoks, toksize);
+ ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX);
+
+ toksizes[ntoks++] = toksize;
+ size += toksize + 4; /* each token has a length word */
+ }
+
+#undef RND
+
+ if (!buffer || buflen < size)
+ return size;
+
+ xdr = (__be32 __user *) buffer;
+ zero = 0;
+#define ENCODE(x) \
+ do { \
+ __be32 y = htonl(x); \
+ if (put_user(y, xdr++) < 0) \
+ goto fault; \
+ } while(0)
+#define ENCODE_DATA(l, s) \
+ do { \
+ u32 _l = (l); \
+ ENCODE(l); \
+ if (copy_to_user(xdr, (s), _l) != 0) \
+ goto fault; \
+ if (_l & 3 && \
+ copy_to_user((u8 __user *)xdr + _l, &zero, 4 - (_l & 3)) != 0) \
+ goto fault; \
+ xdr += (_l + 3) >> 2; \
+ } while(0)
+#define ENCODE64(x) \
+ do { \
+ __be64 y = cpu_to_be64(x); \
+ if (copy_to_user(xdr, &y, 8) != 0) \
+ goto fault; \
+ xdr += 8 >> 2; \
+ } while(0)
+#define ENCODE_STR(s) \
+ do { \
+ const char *_s = (s); \
+ ENCODE_DATA(strlen(_s), _s); \
+ } while(0)
+
+ ENCODE(0); /* flags */
+ ENCODE_DATA(cnlen, key->description + 4); /* cellname */
+ ENCODE(ntoks);
+
+ tok = 0;
+ for (token = key->payload.data; token; token = token->next) {
+ toksize = toksizes[tok++];
+ ENCODE(toksize);
+ oldxdr = xdr;
+ ENCODE(token->security_index);
+
+ switch (token->security_index) {
+ case RXRPC_SECURITY_RXKAD:
+ ENCODE(token->kad->vice_id);
+ ENCODE(token->kad->kvno);
+ ENCODE_DATA(8, token->kad->session_key);
+ ENCODE(token->kad->start);
+ ENCODE(token->kad->expiry);
+ ENCODE(token->kad->primary_flag);
+ ENCODE_DATA(token->kad->ticket_len, token->kad->ticket);
+ break;
+
+ case RXRPC_SECURITY_RXK5:
+ princ = &token->k5->client;
+ ENCODE(princ->n_name_parts);
+ for (loop = 0; loop < princ->n_name_parts; loop++)
+ ENCODE_STR(princ->name_parts[loop]);
+ ENCODE_STR(princ->realm);
+
+ princ = &token->k5->server;
+ ENCODE(princ->n_name_parts);
+ for (loop = 0; loop < princ->n_name_parts; loop++)
+ ENCODE_STR(princ->name_parts[loop]);
+ ENCODE_STR(princ->realm);
+
+ ENCODE(token->k5->session.tag);
+ ENCODE_DATA(token->k5->session.data_len,
+ token->k5->session.data);
+
+ ENCODE64(token->k5->authtime);
+ ENCODE64(token->k5->starttime);
+ ENCODE64(token->k5->endtime);
+ ENCODE64(token->k5->renew_till);
+ ENCODE(token->k5->is_skey);
+ ENCODE(token->k5->flags);
+
+ ENCODE(token->k5->n_addresses);
+ for (loop = 0; loop < token->k5->n_addresses; loop++) {
+ ENCODE(token->k5->addresses[loop].tag);
+ ENCODE_DATA(token->k5->addresses[loop].data_len,
+ token->k5->addresses[loop].data);
+ }
+
+ ENCODE_DATA(token->k5->ticket_len, token->k5->ticket);
+ ENCODE_DATA(token->k5->ticket2_len, token->k5->ticket2);
+
+ ENCODE(token->k5->n_authdata);
+ for (loop = 0; loop < token->k5->n_authdata; loop++) {
+ ENCODE(token->k5->authdata[loop].tag);
+ ENCODE_DATA(token->k5->authdata[loop].data_len,
+ token->k5->authdata[loop].data);
+ }
+ break;
+
+ default:
+ BUG();
+ break;
+ }
+
+ ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,
+ toksize);
+ }
+
+#undef ENCODE_STR
+#undef ENCODE_DATA
+#undef ENCODE64
+#undef ENCODE
+
+ ASSERTCMP(tok, ==, ntoks);
+ ASSERTCMP((char __user *) xdr - buffer, ==, size);
+ _leave(" = %zu", size);
+ return size;
+
+fault:
+ _leave(" = -EFAULT");
+ return -EFAULT;
+}
diff --git a/net/rxrpc/ar-local.c b/net/rxrpc/ar-local.c
new file mode 100644
index 000000000..ca904ed54
--- /dev/null
+++ b/net/rxrpc/ar-local.c
@@ -0,0 +1,408 @@
+/* AF_RXRPC local endpoint management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/udp.h>
+#include <linux/ip.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <generated/utsrelease.h>
+#include "ar-internal.h"
+
+static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
+
+static LIST_HEAD(rxrpc_locals);
+DEFINE_RWLOCK(rxrpc_local_lock);
+static DECLARE_RWSEM(rxrpc_local_sem);
+static DECLARE_WAIT_QUEUE_HEAD(rxrpc_local_wq);
+
+static void rxrpc_destroy_local(struct work_struct *work);
+static void rxrpc_process_local_events(struct work_struct *work);
+
+/*
+ * allocate a new local
+ */
+static
+struct rxrpc_local *rxrpc_alloc_local(struct sockaddr_rxrpc *srx)
+{
+ struct rxrpc_local *local;
+
+ local = kzalloc(sizeof(struct rxrpc_local), GFP_KERNEL);
+ if (local) {
+ INIT_WORK(&local->destroyer, &rxrpc_destroy_local);
+ INIT_WORK(&local->acceptor, &rxrpc_accept_incoming_calls);
+ INIT_WORK(&local->rejecter, &rxrpc_reject_packets);
+ INIT_WORK(&local->event_processor, &rxrpc_process_local_events);
+ INIT_LIST_HEAD(&local->services);
+ INIT_LIST_HEAD(&local->link);
+ init_rwsem(&local->defrag_sem);
+ skb_queue_head_init(&local->accept_queue);
+ skb_queue_head_init(&local->reject_queue);
+ skb_queue_head_init(&local->event_queue);
+ spin_lock_init(&local->lock);
+ rwlock_init(&local->services_lock);
+ atomic_set(&local->usage, 1);
+ local->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ memcpy(&local->srx, srx, sizeof(*srx));
+ }
+
+ _leave(" = %p", local);
+ return local;
+}
+
+/*
+ * create the local socket
+ * - must be called with rxrpc_local_sem writelocked
+ */
+static int rxrpc_create_local(struct rxrpc_local *local)
+{
+ struct sock *sock;
+ int ret, opt;
+
+ _enter("%p{%d}", local, local->srx.transport_type);
+
+ /* create a socket to represent the local endpoint */
+ ret = sock_create_kern(PF_INET, local->srx.transport_type, IPPROTO_UDP,
+ &local->socket);
+ if (ret < 0) {
+ _leave(" = %d [socket]", ret);
+ return ret;
+ }
+
+ /* if a local address was supplied then bind it */
+ if (local->srx.transport_len > sizeof(sa_family_t)) {
+ _debug("bind");
+ ret = kernel_bind(local->socket,
+ (struct sockaddr *) &local->srx.transport,
+ local->srx.transport_len);
+ if (ret < 0) {
+ _debug("bind failed");
+ goto error;
+ }
+ }
+
+ /* we want to receive ICMP errors */
+ opt = 1;
+ ret = kernel_setsockopt(local->socket, SOL_IP, IP_RECVERR,
+ (char *) &opt, sizeof(opt));
+ if (ret < 0) {
+ _debug("setsockopt failed");
+ goto error;
+ }
+
+ /* we want to set the don't fragment bit */
+ opt = IP_PMTUDISC_DO;
+ ret = kernel_setsockopt(local->socket, SOL_IP, IP_MTU_DISCOVER,
+ (char *) &opt, sizeof(opt));
+ if (ret < 0) {
+ _debug("setsockopt failed");
+ goto error;
+ }
+
+ write_lock_bh(&rxrpc_local_lock);
+ list_add(&local->link, &rxrpc_locals);
+ write_unlock_bh(&rxrpc_local_lock);
+
+ /* set the socket up */
+ sock = local->socket->sk;
+ sock->sk_user_data = local;
+ sock->sk_data_ready = rxrpc_data_ready;
+ sock->sk_error_report = rxrpc_UDP_error_report;
+ _leave(" = 0");
+ return 0;
+
+error:
+ kernel_sock_shutdown(local->socket, SHUT_RDWR);
+ local->socket->sk->sk_user_data = NULL;
+ sock_release(local->socket);
+ local->socket = NULL;
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * create a new local endpoint using the specified UDP address
+ */
+struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *srx)
+{
+ struct rxrpc_local *local;
+ int ret;
+
+ _enter("{%d,%u,%pI4+%hu}",
+ srx->transport_type,
+ srx->transport.family,
+ &srx->transport.sin.sin_addr,
+ ntohs(srx->transport.sin.sin_port));
+
+ down_write(&rxrpc_local_sem);
+
+ /* see if we have a suitable local local endpoint already */
+ read_lock_bh(&rxrpc_local_lock);
+
+ list_for_each_entry(local, &rxrpc_locals, link) {
+ _debug("CMP {%d,%u,%pI4+%hu}",
+ local->srx.transport_type,
+ local->srx.transport.family,
+ &local->srx.transport.sin.sin_addr,
+ ntohs(local->srx.transport.sin.sin_port));
+
+ if (local->srx.transport_type != srx->transport_type ||
+ local->srx.transport.family != srx->transport.family)
+ continue;
+
+ switch (srx->transport.family) {
+ case AF_INET:
+ if (local->srx.transport.sin.sin_port !=
+ srx->transport.sin.sin_port)
+ continue;
+ if (memcmp(&local->srx.transport.sin.sin_addr,
+ &srx->transport.sin.sin_addr,
+ sizeof(struct in_addr)) != 0)
+ continue;
+ goto found_local;
+
+ default:
+ BUG();
+ }
+ }
+
+ read_unlock_bh(&rxrpc_local_lock);
+
+ /* we didn't find one, so we need to create one */
+ local = rxrpc_alloc_local(srx);
+ if (!local) {
+ up_write(&rxrpc_local_sem);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ ret = rxrpc_create_local(local);
+ if (ret < 0) {
+ up_write(&rxrpc_local_sem);
+ kfree(local);
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+ }
+
+ up_write(&rxrpc_local_sem);
+
+ _net("LOCAL new %d {%d,%u,%pI4+%hu}",
+ local->debug_id,
+ local->srx.transport_type,
+ local->srx.transport.family,
+ &local->srx.transport.sin.sin_addr,
+ ntohs(local->srx.transport.sin.sin_port));
+
+ _leave(" = %p [new]", local);
+ return local;
+
+found_local:
+ rxrpc_get_local(local);
+ read_unlock_bh(&rxrpc_local_lock);
+ up_write(&rxrpc_local_sem);
+
+ _net("LOCAL old %d {%d,%u,%pI4+%hu}",
+ local->debug_id,
+ local->srx.transport_type,
+ local->srx.transport.family,
+ &local->srx.transport.sin.sin_addr,
+ ntohs(local->srx.transport.sin.sin_port));
+
+ _leave(" = %p [reuse]", local);
+ return local;
+}
+
+/*
+ * release a local endpoint
+ */
+void rxrpc_put_local(struct rxrpc_local *local)
+{
+ _enter("%p{u=%d}", local, atomic_read(&local->usage));
+
+ ASSERTCMP(atomic_read(&local->usage), >, 0);
+
+ /* to prevent a race, the decrement and the dequeue must be effectively
+ * atomic */
+ write_lock_bh(&rxrpc_local_lock);
+ if (unlikely(atomic_dec_and_test(&local->usage))) {
+ _debug("destroy local");
+ rxrpc_queue_work(&local->destroyer);
+ }
+ write_unlock_bh(&rxrpc_local_lock);
+ _leave("");
+}
+
+/*
+ * destroy a local endpoint
+ */
+static void rxrpc_destroy_local(struct work_struct *work)
+{
+ struct rxrpc_local *local =
+ container_of(work, struct rxrpc_local, destroyer);
+
+ _enter("%p{%d}", local, atomic_read(&local->usage));
+
+ down_write(&rxrpc_local_sem);
+
+ write_lock_bh(&rxrpc_local_lock);
+ if (atomic_read(&local->usage) > 0) {
+ write_unlock_bh(&rxrpc_local_lock);
+ up_read(&rxrpc_local_sem);
+ _leave(" [resurrected]");
+ return;
+ }
+
+ list_del(&local->link);
+ local->socket->sk->sk_user_data = NULL;
+ write_unlock_bh(&rxrpc_local_lock);
+
+ downgrade_write(&rxrpc_local_sem);
+
+ ASSERT(list_empty(&local->services));
+ ASSERT(!work_pending(&local->acceptor));
+ ASSERT(!work_pending(&local->rejecter));
+ ASSERT(!work_pending(&local->event_processor));
+
+ /* finish cleaning up the local descriptor */
+ rxrpc_purge_queue(&local->accept_queue);
+ rxrpc_purge_queue(&local->reject_queue);
+ rxrpc_purge_queue(&local->event_queue);
+ kernel_sock_shutdown(local->socket, SHUT_RDWR);
+ sock_release(local->socket);
+
+ up_read(&rxrpc_local_sem);
+
+ _net("DESTROY LOCAL %d", local->debug_id);
+ kfree(local);
+
+ if (list_empty(&rxrpc_locals))
+ wake_up_all(&rxrpc_local_wq);
+
+ _leave("");
+}
+
+/*
+ * preemptively destroy all local local endpoint rather than waiting for
+ * them to be destroyed
+ */
+void __exit rxrpc_destroy_all_locals(void)
+{
+ DECLARE_WAITQUEUE(myself,current);
+
+ _enter("");
+
+ /* we simply have to wait for them to go away */
+ if (!list_empty(&rxrpc_locals)) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&rxrpc_local_wq, &myself);
+
+ while (!list_empty(&rxrpc_locals)) {
+ schedule();
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ }
+
+ remove_wait_queue(&rxrpc_local_wq, &myself);
+ set_current_state(TASK_RUNNING);
+ }
+
+ _leave("");
+}
+
+/*
+ * Reply to a version request
+ */
+static void rxrpc_send_version_request(struct rxrpc_local *local,
+ struct rxrpc_header *hdr,
+ struct sk_buff *skb)
+{
+ struct sockaddr_in sin;
+ struct msghdr msg;
+ struct kvec iov[2];
+ size_t len;
+ int ret;
+
+ _enter("");
+
+ sin.sin_family = AF_INET;
+ sin.sin_port = udp_hdr(skb)->source;
+ sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+
+ msg.msg_name = &sin;
+ msg.msg_namelen = sizeof(sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ hdr->seq = 0;
+ hdr->serial = 0;
+ hdr->type = RXRPC_PACKET_TYPE_VERSION;
+ hdr->flags = RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
+ hdr->userStatus = 0;
+ hdr->_rsvd = 0;
+
+ iov[0].iov_base = hdr;
+ iov[0].iov_len = sizeof(*hdr);
+ iov[1].iov_base = (char *)rxrpc_version_string;
+ iov[1].iov_len = sizeof(rxrpc_version_string);
+
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ _proto("Tx VERSION (reply)");
+
+ ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
+ if (ret < 0)
+ _debug("sendmsg failed: %d", ret);
+
+ _leave("");
+}
+
+/*
+ * Process event packets targetted at a local endpoint.
+ */
+static void rxrpc_process_local_events(struct work_struct *work)
+{
+ struct rxrpc_local *local = container_of(work, struct rxrpc_local, event_processor);
+ struct sk_buff *skb;
+ char v;
+
+ _enter("");
+
+ atomic_inc(&local->usage);
+
+ while ((skb = skb_dequeue(&local->event_queue))) {
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ kdebug("{%d},{%u}", local->debug_id, sp->hdr.type);
+
+ switch (sp->hdr.type) {
+ case RXRPC_PACKET_TYPE_VERSION:
+ if (skb_copy_bits(skb, 0, &v, 1) < 0)
+ return;
+ _proto("Rx VERSION { %02x }", v);
+ if (v == 0)
+ rxrpc_send_version_request(local, &sp->hdr, skb);
+ break;
+
+ default:
+ /* Just ignore anything we don't understand */
+ break;
+ }
+
+ rxrpc_put_local(local);
+ rxrpc_free_skb(skb);
+ }
+
+ rxrpc_put_local(local);
+ _leave("");
+}
diff --git a/net/rxrpc/ar-output.c b/net/rxrpc/ar-output.c
new file mode 100644
index 000000000..c0042807b
--- /dev/null
+++ b/net/rxrpc/ar-output.c
@@ -0,0 +1,711 @@
+/* RxRPC packet transmission
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/net.h>
+#include <linux/gfp.h>
+#include <linux/skbuff.h>
+#include <linux/circ_buf.h>
+#include <linux/export.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * Time till packet resend (in jiffies).
+ */
+unsigned rxrpc_resend_timeout = 4 * HZ;
+
+static int rxrpc_send_data(struct rxrpc_sock *rx,
+ struct rxrpc_call *call,
+ struct msghdr *msg, size_t len);
+
+/*
+ * extract control messages from the sendmsg() control buffer
+ */
+static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg,
+ unsigned long *user_call_ID,
+ enum rxrpc_command *command,
+ u32 *abort_code,
+ bool server)
+{
+ struct cmsghdr *cmsg;
+ int len;
+
+ *command = RXRPC_CMD_SEND_DATA;
+
+ if (msg->msg_controllen == 0)
+ return -EINVAL;
+
+ for_each_cmsghdr(cmsg, msg) {
+ if (!CMSG_OK(msg, cmsg))
+ return -EINVAL;
+
+ len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
+ _debug("CMSG %d, %d, %d",
+ cmsg->cmsg_level, cmsg->cmsg_type, len);
+
+ if (cmsg->cmsg_level != SOL_RXRPC)
+ continue;
+
+ switch (cmsg->cmsg_type) {
+ case RXRPC_USER_CALL_ID:
+ if (msg->msg_flags & MSG_CMSG_COMPAT) {
+ if (len != sizeof(u32))
+ return -EINVAL;
+ *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
+ } else {
+ if (len != sizeof(unsigned long))
+ return -EINVAL;
+ *user_call_ID = *(unsigned long *)
+ CMSG_DATA(cmsg);
+ }
+ _debug("User Call ID %lx", *user_call_ID);
+ break;
+
+ case RXRPC_ABORT:
+ if (*command != RXRPC_CMD_SEND_DATA)
+ return -EINVAL;
+ *command = RXRPC_CMD_SEND_ABORT;
+ if (len != sizeof(*abort_code))
+ return -EINVAL;
+ *abort_code = *(unsigned int *) CMSG_DATA(cmsg);
+ _debug("Abort %x", *abort_code);
+ if (*abort_code == 0)
+ return -EINVAL;
+ break;
+
+ case RXRPC_ACCEPT:
+ if (*command != RXRPC_CMD_SEND_DATA)
+ return -EINVAL;
+ *command = RXRPC_CMD_ACCEPT;
+ if (len != 0)
+ return -EINVAL;
+ if (!server)
+ return -EISCONN;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ }
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * abort a call, sending an ABORT packet to the peer
+ */
+static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
+{
+ write_lock_bh(&call->state_lock);
+
+ if (call->state <= RXRPC_CALL_COMPLETE) {
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->abort_code = abort_code;
+ set_bit(RXRPC_CALL_ABORT, &call->events);
+ del_timer_sync(&call->resend_timer);
+ del_timer_sync(&call->ack_timer);
+ clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+ clear_bit(RXRPC_CALL_ACK, &call->events);
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ rxrpc_queue_call(call);
+ }
+
+ write_unlock_bh(&call->state_lock);
+}
+
+/*
+ * send a message forming part of a client call through an RxRPC socket
+ * - caller holds the socket locked
+ * - the socket may be either a client socket or a server socket
+ */
+int rxrpc_client_sendmsg(struct rxrpc_sock *rx, struct rxrpc_transport *trans,
+ struct msghdr *msg, size_t len)
+{
+ struct rxrpc_conn_bundle *bundle;
+ enum rxrpc_command cmd;
+ struct rxrpc_call *call;
+ unsigned long user_call_ID = 0;
+ struct key *key;
+ __be16 service_id;
+ u32 abort_code = 0;
+ int ret;
+
+ _enter("");
+
+ ASSERT(trans != NULL);
+
+ ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
+ false);
+ if (ret < 0)
+ return ret;
+
+ bundle = NULL;
+ if (trans) {
+ service_id = rx->service_id;
+ if (msg->msg_name) {
+ DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx,
+ msg->msg_name);
+ service_id = htons(srx->srx_service);
+ }
+ key = rx->key;
+ if (key && !rx->key->payload.data)
+ key = NULL;
+ bundle = rxrpc_get_bundle(rx, trans, key, service_id,
+ GFP_KERNEL);
+ if (IS_ERR(bundle))
+ return PTR_ERR(bundle);
+ }
+
+ call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID,
+ abort_code == 0, GFP_KERNEL);
+ if (trans)
+ rxrpc_put_bundle(trans, bundle);
+ if (IS_ERR(call)) {
+ _leave(" = %ld", PTR_ERR(call));
+ return PTR_ERR(call);
+ }
+
+ _debug("CALL %d USR %lx ST %d on CONN %p",
+ call->debug_id, call->user_call_ID, call->state, call->conn);
+
+ if (call->state >= RXRPC_CALL_COMPLETE) {
+ /* it's too late for this call */
+ ret = -ESHUTDOWN;
+ } else if (cmd == RXRPC_CMD_SEND_ABORT) {
+ rxrpc_send_abort(call, abort_code);
+ } else if (cmd != RXRPC_CMD_SEND_DATA) {
+ ret = -EINVAL;
+ } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
+ /* request phase complete for this client call */
+ ret = -EPROTO;
+ } else {
+ ret = rxrpc_send_data(rx, call, msg, len);
+ }
+
+ rxrpc_put_call(call);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/**
+ * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
+ * @call: The call to send data through
+ * @msg: The data to send
+ * @len: The amount of data to send
+ *
+ * Allow a kernel service to send data on a call. The call must be in an state
+ * appropriate to sending data. No control data should be supplied in @msg,
+ * nor should an address be supplied. MSG_MORE should be flagged if there's
+ * more data to come, otherwise this data will end the transmission phase.
+ */
+int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg,
+ size_t len)
+{
+ int ret;
+
+ _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
+
+ ASSERTCMP(msg->msg_name, ==, NULL);
+ ASSERTCMP(msg->msg_control, ==, NULL);
+
+ lock_sock(&call->socket->sk);
+
+ _debug("CALL %d USR %lx ST %d on CONN %p",
+ call->debug_id, call->user_call_ID, call->state, call->conn);
+
+ if (call->state >= RXRPC_CALL_COMPLETE) {
+ ret = -ESHUTDOWN; /* it's too late for this call */
+ } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
+ call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
+ call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
+ ret = -EPROTO; /* request phase complete for this client call */
+ } else {
+ ret = rxrpc_send_data(call->socket, call, msg, len);
+ }
+
+ release_sock(&call->socket->sk);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_send_data);
+
+/**
+ * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
+ * @call: The call to be aborted
+ * @abort_code: The abort code to stick into the ABORT packet
+ *
+ * Allow a kernel service to abort a call, if it's still in an abortable state.
+ */
+void rxrpc_kernel_abort_call(struct rxrpc_call *call, u32 abort_code)
+{
+ _enter("{%d},%d", call->debug_id, abort_code);
+
+ lock_sock(&call->socket->sk);
+
+ _debug("CALL %d USR %lx ST %d on CONN %p",
+ call->debug_id, call->user_call_ID, call->state, call->conn);
+
+ if (call->state < RXRPC_CALL_COMPLETE)
+ rxrpc_send_abort(call, abort_code);
+
+ release_sock(&call->socket->sk);
+ _leave("");
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_abort_call);
+
+/*
+ * send a message through a server socket
+ * - caller holds the socket locked
+ */
+int rxrpc_server_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
+{
+ enum rxrpc_command cmd;
+ struct rxrpc_call *call;
+ unsigned long user_call_ID = 0;
+ u32 abort_code = 0;
+ int ret;
+
+ _enter("");
+
+ ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
+ true);
+ if (ret < 0)
+ return ret;
+
+ if (cmd == RXRPC_CMD_ACCEPT) {
+ call = rxrpc_accept_call(rx, user_call_ID);
+ if (IS_ERR(call))
+ return PTR_ERR(call);
+ rxrpc_put_call(call);
+ return 0;
+ }
+
+ call = rxrpc_find_server_call(rx, user_call_ID);
+ if (!call)
+ return -EBADSLT;
+ if (call->state >= RXRPC_CALL_COMPLETE) {
+ ret = -ESHUTDOWN;
+ goto out;
+ }
+
+ switch (cmd) {
+ case RXRPC_CMD_SEND_DATA:
+ if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
+ call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
+ call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
+ /* Tx phase not yet begun for this call */
+ ret = -EPROTO;
+ break;
+ }
+
+ ret = rxrpc_send_data(rx, call, msg, len);
+ break;
+
+ case RXRPC_CMD_SEND_ABORT:
+ rxrpc_send_abort(call, abort_code);
+ break;
+ default:
+ BUG();
+ }
+
+ out:
+ rxrpc_put_call(call);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * send a packet through the transport endpoint
+ */
+int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb)
+{
+ struct kvec iov[1];
+ struct msghdr msg;
+ int ret, opt;
+
+ _enter(",{%d}", skb->len);
+
+ iov[0].iov_base = skb->head;
+ iov[0].iov_len = skb->len;
+
+ msg.msg_name = &trans->peer->srx.transport.sin;
+ msg.msg_namelen = sizeof(trans->peer->srx.transport.sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ /* send the packet with the don't fragment bit set if we currently
+ * think it's small enough */
+ if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) {
+ down_read(&trans->local->defrag_sem);
+ /* send the packet by UDP
+ * - returns -EMSGSIZE if UDP would have to fragment the packet
+ * to go out of the interface
+ * - in which case, we'll have processed the ICMP error
+ * message and update the peer record
+ */
+ ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
+ iov[0].iov_len);
+
+ up_read(&trans->local->defrag_sem);
+ if (ret == -EMSGSIZE)
+ goto send_fragmentable;
+
+ _leave(" = %d [%u]", ret, trans->peer->maxdata);
+ return ret;
+ }
+
+send_fragmentable:
+ /* attempt to send this message with fragmentation enabled */
+ _debug("send fragment");
+
+ down_write(&trans->local->defrag_sem);
+ opt = IP_PMTUDISC_DONT;
+ ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER,
+ (char *) &opt, sizeof(opt));
+ if (ret == 0) {
+ ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
+ iov[0].iov_len);
+
+ opt = IP_PMTUDISC_DO;
+ kernel_setsockopt(trans->local->socket, SOL_IP,
+ IP_MTU_DISCOVER, (char *) &opt, sizeof(opt));
+ }
+
+ up_write(&trans->local->defrag_sem);
+ _leave(" = %d [frag %u]", ret, trans->peer->maxdata);
+ return ret;
+}
+
+/*
+ * wait for space to appear in the transmit/ACK window
+ * - caller holds the socket locked
+ */
+static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
+ struct rxrpc_call *call,
+ long *timeo)
+{
+ DECLARE_WAITQUEUE(myself, current);
+ int ret;
+
+ _enter(",{%d},%ld",
+ CIRC_SPACE(call->acks_head, call->acks_tail, call->acks_winsz),
+ *timeo);
+
+ add_wait_queue(&call->tx_waitq, &myself);
+
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ ret = 0;
+ if (CIRC_SPACE(call->acks_head, call->acks_tail,
+ call->acks_winsz) > 0)
+ break;
+ if (signal_pending(current)) {
+ ret = sock_intr_errno(*timeo);
+ break;
+ }
+
+ release_sock(&rx->sk);
+ *timeo = schedule_timeout(*timeo);
+ lock_sock(&rx->sk);
+ }
+
+ remove_wait_queue(&call->tx_waitq, &myself);
+ set_current_state(TASK_RUNNING);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * attempt to schedule an instant Tx resend
+ */
+static inline void rxrpc_instant_resend(struct rxrpc_call *call)
+{
+ read_lock_bh(&call->state_lock);
+ if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
+ rxrpc_queue_call(call);
+ }
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * queue a packet for transmission, set the resend timer and attempt
+ * to send the packet immediately
+ */
+static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
+ bool last)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ int ret;
+
+ _net("queue skb %p [%d]", skb, call->acks_head);
+
+ ASSERT(call->acks_window != NULL);
+ call->acks_window[call->acks_head] = (unsigned long) skb;
+ smp_wmb();
+ call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1);
+
+ if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
+ _debug("________awaiting reply/ACK__________");
+ write_lock_bh(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_CLIENT_SEND_REQUEST:
+ call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
+ break;
+ case RXRPC_CALL_SERVER_ACK_REQUEST:
+ call->state = RXRPC_CALL_SERVER_SEND_REPLY;
+ if (!last)
+ break;
+ case RXRPC_CALL_SERVER_SEND_REPLY:
+ call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
+ break;
+ default:
+ break;
+ }
+ write_unlock_bh(&call->state_lock);
+ }
+
+ _proto("Tx DATA %%%u { #%u }",
+ ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
+
+ sp->need_resend = false;
+ sp->resend_at = jiffies + rxrpc_resend_timeout;
+ if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) {
+ _debug("run timer");
+ call->resend_timer.expires = sp->resend_at;
+ add_timer(&call->resend_timer);
+ }
+
+ /* attempt to cancel the rx-ACK timer, deferring reply transmission if
+ * we're ACK'ing the request phase of an incoming call */
+ ret = -EAGAIN;
+ if (try_to_del_timer_sync(&call->ack_timer) >= 0) {
+ /* the packet may be freed by rxrpc_process_call() before this
+ * returns */
+ ret = rxrpc_send_packet(call->conn->trans, skb);
+ _net("sent skb %p", skb);
+ } else {
+ _debug("failed to delete ACK timer");
+ }
+
+ if (ret < 0) {
+ _debug("need instant resend %d", ret);
+ sp->need_resend = true;
+ rxrpc_instant_resend(call);
+ }
+
+ _leave("");
+}
+
+/*
+ * send data through a socket
+ * - must be called in process context
+ * - caller holds the socket locked
+ */
+static int rxrpc_send_data(struct rxrpc_sock *rx,
+ struct rxrpc_call *call,
+ struct msghdr *msg, size_t len)
+{
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+ struct sock *sk = &rx->sk;
+ long timeo;
+ bool more;
+ int ret, copied;
+
+ timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
+
+ /* this should be in poll */
+ clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+
+ if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
+ return -EPIPE;
+
+ more = msg->msg_flags & MSG_MORE;
+
+ skb = call->tx_pending;
+ call->tx_pending = NULL;
+
+ copied = 0;
+ do {
+ if (!skb) {
+ size_t size, chunk, max, space;
+
+ _debug("alloc");
+
+ if (CIRC_SPACE(call->acks_head, call->acks_tail,
+ call->acks_winsz) <= 0) {
+ ret = -EAGAIN;
+ if (msg->msg_flags & MSG_DONTWAIT)
+ goto maybe_error;
+ ret = rxrpc_wait_for_tx_window(rx, call,
+ &timeo);
+ if (ret < 0)
+ goto maybe_error;
+ }
+
+ max = call->conn->trans->peer->maxdata;
+ max -= call->conn->security_size;
+ max &= ~(call->conn->size_align - 1UL);
+
+ chunk = max;
+ if (chunk > msg_data_left(msg) && !more)
+ chunk = msg_data_left(msg);
+
+ space = chunk + call->conn->size_align;
+ space &= ~(call->conn->size_align - 1UL);
+
+ size = space + call->conn->header_size;
+
+ _debug("SIZE: %zu/%zu/%zu", chunk, space, size);
+
+ /* create a buffer that we can retain until it's ACK'd */
+ skb = sock_alloc_send_skb(
+ sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
+ if (!skb)
+ goto maybe_error;
+
+ rxrpc_new_skb(skb);
+
+ _debug("ALLOC SEND %p", skb);
+
+ ASSERTCMP(skb->mark, ==, 0);
+
+ _debug("HS: %u", call->conn->header_size);
+ skb_reserve(skb, call->conn->header_size);
+ skb->len += call->conn->header_size;
+
+ sp = rxrpc_skb(skb);
+ sp->remain = chunk;
+ if (sp->remain > skb_tailroom(skb))
+ sp->remain = skb_tailroom(skb);
+
+ _net("skb: hr %d, tr %d, hl %d, rm %d",
+ skb_headroom(skb),
+ skb_tailroom(skb),
+ skb_headlen(skb),
+ sp->remain);
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ _debug("append");
+ sp = rxrpc_skb(skb);
+
+ /* append next segment of data to the current buffer */
+ if (msg_data_left(msg) > 0) {
+ int copy = skb_tailroom(skb);
+ ASSERTCMP(copy, >, 0);
+ if (copy > msg_data_left(msg))
+ copy = msg_data_left(msg);
+ if (copy > sp->remain)
+ copy = sp->remain;
+
+ _debug("add");
+ ret = skb_add_data(skb, &msg->msg_iter, copy);
+ _debug("added");
+ if (ret < 0)
+ goto efault;
+ sp->remain -= copy;
+ skb->mark += copy;
+ copied += copy;
+ }
+
+ /* check for the far side aborting the call or a network error
+ * occurring */
+ if (call->state > RXRPC_CALL_COMPLETE)
+ goto call_aborted;
+
+ /* add the packet to the send queue if it's now full */
+ if (sp->remain <= 0 ||
+ (msg_data_left(msg) == 0 && !more)) {
+ struct rxrpc_connection *conn = call->conn;
+ uint32_t seq;
+ size_t pad;
+
+ /* pad out if we're using security */
+ if (conn->security) {
+ pad = conn->security_size + skb->mark;
+ pad = conn->size_align - pad;
+ pad &= conn->size_align - 1;
+ _debug("pad %zu", pad);
+ if (pad)
+ memset(skb_put(skb, pad), 0, pad);
+ }
+
+ seq = atomic_inc_return(&call->sequence);
+
+ sp->hdr.epoch = conn->epoch;
+ sp->hdr.cid = call->cid;
+ sp->hdr.callNumber = call->call_id;
+ sp->hdr.seq = htonl(seq);
+ sp->hdr.serial =
+ htonl(atomic_inc_return(&conn->serial));
+ sp->hdr.type = RXRPC_PACKET_TYPE_DATA;
+ sp->hdr.userStatus = 0;
+ sp->hdr.securityIndex = conn->security_ix;
+ sp->hdr._rsvd = 0;
+ sp->hdr.serviceId = conn->service_id;
+
+ sp->hdr.flags = conn->out_clientflag;
+ if (msg_data_left(msg) == 0 && !more)
+ sp->hdr.flags |= RXRPC_LAST_PACKET;
+ else if (CIRC_SPACE(call->acks_head, call->acks_tail,
+ call->acks_winsz) > 1)
+ sp->hdr.flags |= RXRPC_MORE_PACKETS;
+ if (more && seq & 1)
+ sp->hdr.flags |= RXRPC_REQUEST_ACK;
+
+ ret = rxrpc_secure_packet(
+ call, skb, skb->mark,
+ skb->head + sizeof(struct rxrpc_header));
+ if (ret < 0)
+ goto out;
+
+ memcpy(skb->head, &sp->hdr,
+ sizeof(struct rxrpc_header));
+ rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more);
+ skb = NULL;
+ }
+ } while (msg_data_left(msg) > 0);
+
+success:
+ ret = copied;
+out:
+ call->tx_pending = skb;
+ _leave(" = %d", ret);
+ return ret;
+
+call_aborted:
+ rxrpc_free_skb(skb);
+ if (call->state == RXRPC_CALL_NETWORK_ERROR)
+ ret = call->conn->trans->peer->net_error;
+ else
+ ret = -ECONNABORTED;
+ _leave(" = %d", ret);
+ return ret;
+
+maybe_error:
+ if (copied)
+ goto success;
+ goto out;
+
+efault:
+ ret = -EFAULT;
+ goto out;
+}
diff --git a/net/rxrpc/ar-peer.c b/net/rxrpc/ar-peer.c
new file mode 100644
index 000000000..bebaa4348
--- /dev/null
+++ b/net/rxrpc/ar-peer.c
@@ -0,0 +1,303 @@
+/* RxRPC remote transport endpoint management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include "ar-internal.h"
+
+static LIST_HEAD(rxrpc_peers);
+static DEFINE_RWLOCK(rxrpc_peer_lock);
+static DECLARE_WAIT_QUEUE_HEAD(rxrpc_peer_wq);
+
+static void rxrpc_destroy_peer(struct work_struct *work);
+
+/*
+ * assess the MTU size for the network interface through which this peer is
+ * reached
+ */
+static void rxrpc_assess_MTU_size(struct rxrpc_peer *peer)
+{
+ struct rtable *rt;
+ struct flowi4 fl4;
+
+ peer->if_mtu = 1500;
+
+ rt = ip_route_output_ports(&init_net, &fl4, NULL,
+ peer->srx.transport.sin.sin_addr.s_addr, 0,
+ htons(7000), htons(7001),
+ IPPROTO_UDP, 0, 0);
+ if (IS_ERR(rt)) {
+ _leave(" [route err %ld]", PTR_ERR(rt));
+ return;
+ }
+
+ peer->if_mtu = dst_mtu(&rt->dst);
+ dst_release(&rt->dst);
+
+ _leave(" [if_mtu %u]", peer->if_mtu);
+}
+
+/*
+ * allocate a new peer
+ */
+static struct rxrpc_peer *rxrpc_alloc_peer(struct sockaddr_rxrpc *srx,
+ gfp_t gfp)
+{
+ struct rxrpc_peer *peer;
+
+ _enter("");
+
+ peer = kzalloc(sizeof(struct rxrpc_peer), gfp);
+ if (peer) {
+ INIT_WORK(&peer->destroyer, &rxrpc_destroy_peer);
+ INIT_LIST_HEAD(&peer->link);
+ INIT_LIST_HEAD(&peer->error_targets);
+ spin_lock_init(&peer->lock);
+ atomic_set(&peer->usage, 1);
+ peer->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ memcpy(&peer->srx, srx, sizeof(*srx));
+
+ rxrpc_assess_MTU_size(peer);
+ peer->mtu = peer->if_mtu;
+
+ if (srx->transport.family == AF_INET) {
+ peer->hdrsize = sizeof(struct iphdr);
+ switch (srx->transport_type) {
+ case SOCK_DGRAM:
+ peer->hdrsize += sizeof(struct udphdr);
+ break;
+ default:
+ BUG();
+ break;
+ }
+ } else {
+ BUG();
+ }
+
+ peer->hdrsize += sizeof(struct rxrpc_header);
+ peer->maxdata = peer->mtu - peer->hdrsize;
+ }
+
+ _leave(" = %p", peer);
+ return peer;
+}
+
+/*
+ * obtain a remote transport endpoint for the specified address
+ */
+struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *srx, gfp_t gfp)
+{
+ struct rxrpc_peer *peer, *candidate;
+ const char *new = "old";
+ int usage;
+
+ _enter("{%d,%d,%pI4+%hu}",
+ srx->transport_type,
+ srx->transport_len,
+ &srx->transport.sin.sin_addr,
+ ntohs(srx->transport.sin.sin_port));
+
+ /* search the peer list first */
+ read_lock_bh(&rxrpc_peer_lock);
+ list_for_each_entry(peer, &rxrpc_peers, link) {
+ _debug("check PEER %d { u=%d t=%d l=%d }",
+ peer->debug_id,
+ atomic_read(&peer->usage),
+ peer->srx.transport_type,
+ peer->srx.transport_len);
+
+ if (atomic_read(&peer->usage) > 0 &&
+ peer->srx.transport_type == srx->transport_type &&
+ peer->srx.transport_len == srx->transport_len &&
+ memcmp(&peer->srx.transport,
+ &srx->transport,
+ srx->transport_len) == 0)
+ goto found_extant_peer;
+ }
+ read_unlock_bh(&rxrpc_peer_lock);
+
+ /* not yet present - create a candidate for a new record and then
+ * redo the search */
+ candidate = rxrpc_alloc_peer(srx, gfp);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ write_lock_bh(&rxrpc_peer_lock);
+
+ list_for_each_entry(peer, &rxrpc_peers, link) {
+ if (atomic_read(&peer->usage) > 0 &&
+ peer->srx.transport_type == srx->transport_type &&
+ peer->srx.transport_len == srx->transport_len &&
+ memcmp(&peer->srx.transport,
+ &srx->transport,
+ srx->transport_len) == 0)
+ goto found_extant_second;
+ }
+
+ /* we can now add the new candidate to the list */
+ peer = candidate;
+ candidate = NULL;
+ usage = atomic_read(&peer->usage);
+
+ list_add_tail(&peer->link, &rxrpc_peers);
+ write_unlock_bh(&rxrpc_peer_lock);
+ new = "new";
+
+success:
+ _net("PEER %s %d {%d,%u,%pI4+%hu}",
+ new,
+ peer->debug_id,
+ peer->srx.transport_type,
+ peer->srx.transport.family,
+ &peer->srx.transport.sin.sin_addr,
+ ntohs(peer->srx.transport.sin.sin_port));
+
+ _leave(" = %p {u=%d}", peer, usage);
+ return peer;
+
+ /* we found the peer in the list immediately */
+found_extant_peer:
+ usage = atomic_inc_return(&peer->usage);
+ read_unlock_bh(&rxrpc_peer_lock);
+ goto success;
+
+ /* we found the peer on the second time through the list */
+found_extant_second:
+ usage = atomic_inc_return(&peer->usage);
+ write_unlock_bh(&rxrpc_peer_lock);
+ kfree(candidate);
+ goto success;
+}
+
+/*
+ * find the peer associated with a packet
+ */
+struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *local,
+ __be32 addr, __be16 port)
+{
+ struct rxrpc_peer *peer;
+
+ _enter("");
+
+ /* search the peer list */
+ read_lock_bh(&rxrpc_peer_lock);
+
+ if (local->srx.transport.family == AF_INET &&
+ local->srx.transport_type == SOCK_DGRAM
+ ) {
+ list_for_each_entry(peer, &rxrpc_peers, link) {
+ if (atomic_read(&peer->usage) > 0 &&
+ peer->srx.transport_type == SOCK_DGRAM &&
+ peer->srx.transport.family == AF_INET &&
+ peer->srx.transport.sin.sin_port == port &&
+ peer->srx.transport.sin.sin_addr.s_addr == addr)
+ goto found_UDP_peer;
+ }
+
+ goto new_UDP_peer;
+ }
+
+ read_unlock_bh(&rxrpc_peer_lock);
+ _leave(" = -EAFNOSUPPORT");
+ return ERR_PTR(-EAFNOSUPPORT);
+
+found_UDP_peer:
+ _net("Rx UDP DGRAM from peer %d", peer->debug_id);
+ atomic_inc(&peer->usage);
+ read_unlock_bh(&rxrpc_peer_lock);
+ _leave(" = %p", peer);
+ return peer;
+
+new_UDP_peer:
+ _net("Rx UDP DGRAM from NEW peer");
+ read_unlock_bh(&rxrpc_peer_lock);
+ _leave(" = -EBUSY [new]");
+ return ERR_PTR(-EBUSY);
+}
+
+/*
+ * release a remote transport endpoint
+ */
+void rxrpc_put_peer(struct rxrpc_peer *peer)
+{
+ _enter("%p{u=%d}", peer, atomic_read(&peer->usage));
+
+ ASSERTCMP(atomic_read(&peer->usage), >, 0);
+
+ if (likely(!atomic_dec_and_test(&peer->usage))) {
+ _leave(" [in use]");
+ return;
+ }
+
+ rxrpc_queue_work(&peer->destroyer);
+ _leave("");
+}
+
+/*
+ * destroy a remote transport endpoint
+ */
+static void rxrpc_destroy_peer(struct work_struct *work)
+{
+ struct rxrpc_peer *peer =
+ container_of(work, struct rxrpc_peer, destroyer);
+
+ _enter("%p{%d}", peer, atomic_read(&peer->usage));
+
+ write_lock_bh(&rxrpc_peer_lock);
+ list_del(&peer->link);
+ write_unlock_bh(&rxrpc_peer_lock);
+
+ _net("DESTROY PEER %d", peer->debug_id);
+ kfree(peer);
+
+ if (list_empty(&rxrpc_peers))
+ wake_up_all(&rxrpc_peer_wq);
+ _leave("");
+}
+
+/*
+ * preemptively destroy all the peer records from a transport endpoint rather
+ * than waiting for them to time out
+ */
+void __exit rxrpc_destroy_all_peers(void)
+{
+ DECLARE_WAITQUEUE(myself,current);
+
+ _enter("");
+
+ /* we simply have to wait for them to go away */
+ if (!list_empty(&rxrpc_peers)) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ add_wait_queue(&rxrpc_peer_wq, &myself);
+
+ while (!list_empty(&rxrpc_peers)) {
+ schedule();
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ }
+
+ remove_wait_queue(&rxrpc_peer_wq, &myself);
+ set_current_state(TASK_RUNNING);
+ }
+
+ _leave("");
+}
diff --git a/net/rxrpc/ar-proc.c b/net/rxrpc/ar-proc.c
new file mode 100644
index 000000000..38047f713
--- /dev/null
+++ b/net/rxrpc/ar-proc.c
@@ -0,0 +1,192 @@
+/* /proc/net/ support for AF_RXRPC
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static const char *const rxrpc_conn_states[] = {
+ [RXRPC_CONN_UNUSED] = "Unused ",
+ [RXRPC_CONN_CLIENT] = "Client ",
+ [RXRPC_CONN_SERVER_UNSECURED] = "SvUnsec ",
+ [RXRPC_CONN_SERVER_CHALLENGING] = "SvChall ",
+ [RXRPC_CONN_SERVER] = "SvSecure",
+ [RXRPC_CONN_REMOTELY_ABORTED] = "RmtAbort",
+ [RXRPC_CONN_LOCALLY_ABORTED] = "LocAbort",
+ [RXRPC_CONN_NETWORK_ERROR] = "NetError",
+};
+
+/*
+ * generate a list of extant and dead calls in /proc/net/rxrpc_calls
+ */
+static void *rxrpc_call_seq_start(struct seq_file *seq, loff_t *_pos)
+{
+ read_lock(&rxrpc_call_lock);
+ return seq_list_start_head(&rxrpc_calls, *_pos);
+}
+
+static void *rxrpc_call_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &rxrpc_calls, pos);
+}
+
+static void rxrpc_call_seq_stop(struct seq_file *seq, void *v)
+{
+ read_unlock(&rxrpc_call_lock);
+}
+
+static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
+{
+ struct rxrpc_transport *trans;
+ struct rxrpc_call *call;
+ char lbuff[4 + 4 + 4 + 4 + 5 + 1], rbuff[4 + 4 + 4 + 4 + 5 + 1];
+
+ if (v == &rxrpc_calls) {
+ seq_puts(seq,
+ "Proto Local Remote "
+ " SvID ConnID CallID End Use State Abort "
+ " UserID\n");
+ return 0;
+ }
+
+ call = list_entry(v, struct rxrpc_call, link);
+ trans = call->conn->trans;
+
+ sprintf(lbuff, "%pI4:%u",
+ &trans->local->srx.transport.sin.sin_addr,
+ ntohs(trans->local->srx.transport.sin.sin_port));
+
+ sprintf(rbuff, "%pI4:%u",
+ &trans->peer->srx.transport.sin.sin_addr,
+ ntohs(trans->peer->srx.transport.sin.sin_port));
+
+ seq_printf(seq,
+ "UDP %-22.22s %-22.22s %4x %08x %08x %s %3u"
+ " %-8.8s %08x %lx\n",
+ lbuff,
+ rbuff,
+ ntohs(call->conn->service_id),
+ ntohl(call->conn->cid),
+ ntohl(call->call_id),
+ call->conn->in_clientflag ? "Svc" : "Clt",
+ atomic_read(&call->usage),
+ rxrpc_call_states[call->state],
+ call->abort_code,
+ call->user_call_ID);
+
+ return 0;
+}
+
+static const struct seq_operations rxrpc_call_seq_ops = {
+ .start = rxrpc_call_seq_start,
+ .next = rxrpc_call_seq_next,
+ .stop = rxrpc_call_seq_stop,
+ .show = rxrpc_call_seq_show,
+};
+
+static int rxrpc_call_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &rxrpc_call_seq_ops);
+}
+
+const struct file_operations rxrpc_call_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = rxrpc_call_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+/*
+ * generate a list of extant virtual connections in /proc/net/rxrpc_conns
+ */
+static void *rxrpc_connection_seq_start(struct seq_file *seq, loff_t *_pos)
+{
+ read_lock(&rxrpc_connection_lock);
+ return seq_list_start_head(&rxrpc_connections, *_pos);
+}
+
+static void *rxrpc_connection_seq_next(struct seq_file *seq, void *v,
+ loff_t *pos)
+{
+ return seq_list_next(v, &rxrpc_connections, pos);
+}
+
+static void rxrpc_connection_seq_stop(struct seq_file *seq, void *v)
+{
+ read_unlock(&rxrpc_connection_lock);
+}
+
+static int rxrpc_connection_seq_show(struct seq_file *seq, void *v)
+{
+ struct rxrpc_connection *conn;
+ struct rxrpc_transport *trans;
+ char lbuff[4 + 4 + 4 + 4 + 5 + 1], rbuff[4 + 4 + 4 + 4 + 5 + 1];
+
+ if (v == &rxrpc_connections) {
+ seq_puts(seq,
+ "Proto Local Remote "
+ " SvID ConnID Calls End Use State Key "
+ " Serial ISerial\n"
+ );
+ return 0;
+ }
+
+ conn = list_entry(v, struct rxrpc_connection, link);
+ trans = conn->trans;
+
+ sprintf(lbuff, "%pI4:%u",
+ &trans->local->srx.transport.sin.sin_addr,
+ ntohs(trans->local->srx.transport.sin.sin_port));
+
+ sprintf(rbuff, "%pI4:%u",
+ &trans->peer->srx.transport.sin.sin_addr,
+ ntohs(trans->peer->srx.transport.sin.sin_port));
+
+ seq_printf(seq,
+ "UDP %-22.22s %-22.22s %4x %08x %08x %s %3u"
+ " %s %08x %08x %08x\n",
+ lbuff,
+ rbuff,
+ ntohs(conn->service_id),
+ ntohl(conn->cid),
+ conn->call_counter,
+ conn->in_clientflag ? "Svc" : "Clt",
+ atomic_read(&conn->usage),
+ rxrpc_conn_states[conn->state],
+ key_serial(conn->key),
+ atomic_read(&conn->serial),
+ atomic_read(&conn->hi_serial));
+
+ return 0;
+}
+
+static const struct seq_operations rxrpc_connection_seq_ops = {
+ .start = rxrpc_connection_seq_start,
+ .next = rxrpc_connection_seq_next,
+ .stop = rxrpc_connection_seq_stop,
+ .show = rxrpc_connection_seq_show,
+};
+
+
+static int rxrpc_connection_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &rxrpc_connection_seq_ops);
+}
+
+const struct file_operations rxrpc_connection_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = rxrpc_connection_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
diff --git a/net/rxrpc/ar-recvmsg.c b/net/rxrpc/ar-recvmsg.c
new file mode 100644
index 000000000..b92beded7
--- /dev/null
+++ b/net/rxrpc/ar-recvmsg.c
@@ -0,0 +1,424 @@
+/* RxRPC recvmsg() implementation
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/export.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * removal a call's user ID from the socket tree to make the user ID available
+ * again and so that it won't be seen again in association with that call
+ */
+void rxrpc_remove_user_ID(struct rxrpc_sock *rx, struct rxrpc_call *call)
+{
+ _debug("RELEASE CALL %d", call->debug_id);
+
+ if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+ write_lock_bh(&rx->call_lock);
+ rb_erase(&call->sock_node, &call->socket->calls);
+ clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
+ write_unlock_bh(&rx->call_lock);
+ }
+
+ read_lock_bh(&call->state_lock);
+ if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+ !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * receive a message from an RxRPC socket
+ * - we need to be careful about two or more threads calling recvmsg
+ * simultaneously
+ */
+int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
+ int flags)
+{
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_call *call = NULL, *continue_call = NULL;
+ struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+ struct sk_buff *skb;
+ long timeo;
+ int copy, ret, ullen, offset, copied = 0;
+ u32 abort_code;
+
+ DEFINE_WAIT(wait);
+
+ _enter(",,,%zu,%d", len, flags);
+
+ if (flags & (MSG_OOB | MSG_TRUNC))
+ return -EOPNOTSUPP;
+
+ ullen = msg->msg_flags & MSG_CMSG_COMPAT ? 4 : sizeof(unsigned long);
+
+ timeo = sock_rcvtimeo(&rx->sk, flags & MSG_DONTWAIT);
+ msg->msg_flags |= MSG_MORE;
+
+ lock_sock(&rx->sk);
+
+ for (;;) {
+ /* return immediately if a client socket has no outstanding
+ * calls */
+ if (RB_EMPTY_ROOT(&rx->calls)) {
+ if (copied)
+ goto out;
+ if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) {
+ release_sock(&rx->sk);
+ if (continue_call)
+ rxrpc_put_call(continue_call);
+ return -ENODATA;
+ }
+ }
+
+ /* get the next message on the Rx queue */
+ skb = skb_peek(&rx->sk.sk_receive_queue);
+ if (!skb) {
+ /* nothing remains on the queue */
+ if (copied &&
+ (flags & MSG_PEEK || timeo == 0))
+ goto out;
+
+ /* wait for a message to turn up */
+ release_sock(&rx->sk);
+ prepare_to_wait_exclusive(sk_sleep(&rx->sk), &wait,
+ TASK_INTERRUPTIBLE);
+ ret = sock_error(&rx->sk);
+ if (ret)
+ goto wait_error;
+
+ if (skb_queue_empty(&rx->sk.sk_receive_queue)) {
+ if (signal_pending(current))
+ goto wait_interrupted;
+ timeo = schedule_timeout(timeo);
+ }
+ finish_wait(sk_sleep(&rx->sk), &wait);
+ lock_sock(&rx->sk);
+ continue;
+ }
+
+ peek_next_packet:
+ sp = rxrpc_skb(skb);
+ call = sp->call;
+ ASSERT(call != NULL);
+
+ _debug("next pkt %s", rxrpc_pkts[sp->hdr.type]);
+
+ /* make sure we wait for the state to be updated in this call */
+ spin_lock_bh(&call->lock);
+ spin_unlock_bh(&call->lock);
+
+ if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) {
+ _debug("packet from released call");
+ if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+ BUG();
+ rxrpc_free_skb(skb);
+ continue;
+ }
+
+ /* determine whether to continue last data receive */
+ if (continue_call) {
+ _debug("maybe cont");
+ if (call != continue_call ||
+ skb->mark != RXRPC_SKB_MARK_DATA) {
+ release_sock(&rx->sk);
+ rxrpc_put_call(continue_call);
+ _leave(" = %d [noncont]", copied);
+ return copied;
+ }
+ }
+
+ rxrpc_get_call(call);
+
+ /* copy the peer address and timestamp */
+ if (!continue_call) {
+ if (msg->msg_name) {
+ size_t len =
+ sizeof(call->conn->trans->peer->srx);
+ memcpy(msg->msg_name,
+ &call->conn->trans->peer->srx, len);
+ msg->msg_namelen = len;
+ }
+ sock_recv_timestamp(msg, &rx->sk, skb);
+ }
+
+ /* receive the message */
+ if (skb->mark != RXRPC_SKB_MARK_DATA)
+ goto receive_non_data_message;
+
+ _debug("recvmsg DATA #%u { %d, %d }",
+ ntohl(sp->hdr.seq), skb->len, sp->offset);
+
+ if (!continue_call) {
+ /* only set the control data once per recvmsg() */
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_USER_CALL_ID,
+ ullen, &call->user_call_ID);
+ if (ret < 0)
+ goto copy_error;
+ ASSERT(test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+ }
+
+ ASSERTCMP(ntohl(sp->hdr.seq), >=, call->rx_data_recv);
+ ASSERTCMP(ntohl(sp->hdr.seq), <=, call->rx_data_recv + 1);
+ call->rx_data_recv = ntohl(sp->hdr.seq);
+
+ ASSERTCMP(ntohl(sp->hdr.seq), >, call->rx_data_eaten);
+
+ offset = sp->offset;
+ copy = skb->len - offset;
+ if (copy > len - copied)
+ copy = len - copied;
+
+ ret = skb_copy_datagram_msg(skb, offset, msg, copy);
+
+ if (ret < 0)
+ goto copy_error;
+
+ /* handle piecemeal consumption of data packets */
+ _debug("copied %d+%d", copy, copied);
+
+ offset += copy;
+ copied += copy;
+
+ if (!(flags & MSG_PEEK))
+ sp->offset = offset;
+
+ if (sp->offset < skb->len) {
+ _debug("buffer full");
+ ASSERTCMP(copied, ==, len);
+ break;
+ }
+
+ /* we transferred the whole data packet */
+ if (sp->hdr.flags & RXRPC_LAST_PACKET) {
+ _debug("last");
+ if (call->conn->out_clientflag) {
+ /* last byte of reply received */
+ ret = copied;
+ goto terminal_message;
+ }
+
+ /* last bit of request received */
+ if (!(flags & MSG_PEEK)) {
+ _debug("eat packet");
+ if (skb_dequeue(&rx->sk.sk_receive_queue) !=
+ skb)
+ BUG();
+ rxrpc_free_skb(skb);
+ }
+ msg->msg_flags &= ~MSG_MORE;
+ break;
+ }
+
+ /* move on to the next data message */
+ _debug("next");
+ if (!continue_call)
+ continue_call = sp->call;
+ else
+ rxrpc_put_call(call);
+ call = NULL;
+
+ if (flags & MSG_PEEK) {
+ _debug("peek next");
+ skb = skb->next;
+ if (skb == (struct sk_buff *) &rx->sk.sk_receive_queue)
+ break;
+ goto peek_next_packet;
+ }
+
+ _debug("eat packet");
+ if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+ BUG();
+ rxrpc_free_skb(skb);
+ }
+
+ /* end of non-terminal data packet reception for the moment */
+ _debug("end rcv data");
+out:
+ release_sock(&rx->sk);
+ if (call)
+ rxrpc_put_call(call);
+ if (continue_call)
+ rxrpc_put_call(continue_call);
+ _leave(" = %d [data]", copied);
+ return copied;
+
+ /* handle non-DATA messages such as aborts, incoming connections and
+ * final ACKs */
+receive_non_data_message:
+ _debug("non-data");
+
+ if (skb->mark == RXRPC_SKB_MARK_NEW_CALL) {
+ _debug("RECV NEW CALL");
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_NEW_CALL, 0, &abort_code);
+ if (ret < 0)
+ goto copy_error;
+ if (!(flags & MSG_PEEK)) {
+ if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+ BUG();
+ rxrpc_free_skb(skb);
+ }
+ goto out;
+ }
+
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_USER_CALL_ID,
+ ullen, &call->user_call_ID);
+ if (ret < 0)
+ goto copy_error;
+ ASSERT(test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+
+ switch (skb->mark) {
+ case RXRPC_SKB_MARK_DATA:
+ BUG();
+ case RXRPC_SKB_MARK_FINAL_ACK:
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_ACK, 0, &abort_code);
+ break;
+ case RXRPC_SKB_MARK_BUSY:
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_BUSY, 0, &abort_code);
+ break;
+ case RXRPC_SKB_MARK_REMOTE_ABORT:
+ abort_code = call->abort_code;
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_ABORT, 4, &abort_code);
+ break;
+ case RXRPC_SKB_MARK_NET_ERROR:
+ _debug("RECV NET ERROR %d", sp->error);
+ abort_code = sp->error;
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_NET_ERROR, 4, &abort_code);
+ break;
+ case RXRPC_SKB_MARK_LOCAL_ERROR:
+ _debug("RECV LOCAL ERROR %d", sp->error);
+ abort_code = sp->error;
+ ret = put_cmsg(msg, SOL_RXRPC, RXRPC_LOCAL_ERROR, 4,
+ &abort_code);
+ break;
+ default:
+ BUG();
+ break;
+ }
+
+ if (ret < 0)
+ goto copy_error;
+
+terminal_message:
+ _debug("terminal");
+ msg->msg_flags &= ~MSG_MORE;
+ msg->msg_flags |= MSG_EOR;
+
+ if (!(flags & MSG_PEEK)) {
+ _net("free terminal skb %p", skb);
+ if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+ BUG();
+ rxrpc_free_skb(skb);
+ rxrpc_remove_user_ID(rx, call);
+ }
+
+ release_sock(&rx->sk);
+ rxrpc_put_call(call);
+ if (continue_call)
+ rxrpc_put_call(continue_call);
+ _leave(" = %d", ret);
+ return ret;
+
+copy_error:
+ _debug("copy error");
+ release_sock(&rx->sk);
+ rxrpc_put_call(call);
+ if (continue_call)
+ rxrpc_put_call(continue_call);
+ _leave(" = %d", ret);
+ return ret;
+
+wait_interrupted:
+ ret = sock_intr_errno(timeo);
+wait_error:
+ finish_wait(sk_sleep(&rx->sk), &wait);
+ if (continue_call)
+ rxrpc_put_call(continue_call);
+ if (copied)
+ copied = ret;
+ _leave(" = %d [waitfail %d]", copied, ret);
+ return copied;
+
+}
+
+/**
+ * rxrpc_kernel_data_delivered - Record delivery of data message
+ * @skb: Message holding data
+ *
+ * Record the delivery of a data message. This permits RxRPC to keep its
+ * tracking correct. The socket buffer will be deleted.
+ */
+void rxrpc_kernel_data_delivered(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct rxrpc_call *call = sp->call;
+
+ ASSERTCMP(ntohl(sp->hdr.seq), >=, call->rx_data_recv);
+ ASSERTCMP(ntohl(sp->hdr.seq), <=, call->rx_data_recv + 1);
+ call->rx_data_recv = ntohl(sp->hdr.seq);
+
+ ASSERTCMP(ntohl(sp->hdr.seq), >, call->rx_data_eaten);
+ rxrpc_free_skb(skb);
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_data_delivered);
+
+/**
+ * rxrpc_kernel_is_data_last - Determine if data message is last one
+ * @skb: Message holding data
+ *
+ * Determine if data message is last one for the parent call.
+ */
+bool rxrpc_kernel_is_data_last(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ ASSERTCMP(skb->mark, ==, RXRPC_SKB_MARK_DATA);
+
+ return sp->hdr.flags & RXRPC_LAST_PACKET;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_is_data_last);
+
+/**
+ * rxrpc_kernel_get_abort_code - Get the abort code from an RxRPC abort message
+ * @skb: Message indicating an abort
+ *
+ * Get the abort code from an RxRPC abort message.
+ */
+u32 rxrpc_kernel_get_abort_code(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ ASSERTCMP(skb->mark, ==, RXRPC_SKB_MARK_REMOTE_ABORT);
+
+ return sp->call->abort_code;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_get_abort_code);
+
+/**
+ * rxrpc_kernel_get_error - Get the error number from an RxRPC error message
+ * @skb: Message indicating an error
+ *
+ * Get the error number from an RxRPC error message.
+ */
+int rxrpc_kernel_get_error_number(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+ return sp->error;
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_get_error_number);
diff --git a/net/rxrpc/ar-security.c b/net/rxrpc/ar-security.c
new file mode 100644
index 000000000..49b3cc31e
--- /dev/null
+++ b/net/rxrpc/ar-security.c
@@ -0,0 +1,264 @@
+/* RxRPC security handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <linux/crypto.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <keys/rxrpc-type.h>
+#include "ar-internal.h"
+
+static LIST_HEAD(rxrpc_security_methods);
+static DECLARE_RWSEM(rxrpc_security_sem);
+
+/*
+ * get an RxRPC security module
+ */
+static struct rxrpc_security *rxrpc_security_get(struct rxrpc_security *sec)
+{
+ return try_module_get(sec->owner) ? sec : NULL;
+}
+
+/*
+ * release an RxRPC security module
+ */
+static void rxrpc_security_put(struct rxrpc_security *sec)
+{
+ module_put(sec->owner);
+}
+
+/*
+ * look up an rxrpc security module
+ */
+static struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
+{
+ struct rxrpc_security *sec = NULL;
+
+ _enter("");
+
+ down_read(&rxrpc_security_sem);
+
+ list_for_each_entry(sec, &rxrpc_security_methods, link) {
+ if (sec->security_index == security_index) {
+ if (unlikely(!rxrpc_security_get(sec)))
+ break;
+ goto out;
+ }
+ }
+
+ sec = NULL;
+out:
+ up_read(&rxrpc_security_sem);
+ _leave(" = %p [%s]", sec, sec ? sec->name : "");
+ return sec;
+}
+
+/**
+ * rxrpc_register_security - register an RxRPC security handler
+ * @sec: security module
+ *
+ * register an RxRPC security handler for use by RxRPC
+ */
+int rxrpc_register_security(struct rxrpc_security *sec)
+{
+ struct rxrpc_security *psec;
+ int ret;
+
+ _enter("");
+ down_write(&rxrpc_security_sem);
+
+ ret = -EEXIST;
+ list_for_each_entry(psec, &rxrpc_security_methods, link) {
+ if (psec->security_index == sec->security_index)
+ goto out;
+ }
+
+ list_add(&sec->link, &rxrpc_security_methods);
+
+ printk(KERN_NOTICE "RxRPC: Registered security type %d '%s'\n",
+ sec->security_index, sec->name);
+ ret = 0;
+
+out:
+ up_write(&rxrpc_security_sem);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+EXPORT_SYMBOL_GPL(rxrpc_register_security);
+
+/**
+ * rxrpc_unregister_security - unregister an RxRPC security handler
+ * @sec: security module
+ *
+ * unregister an RxRPC security handler
+ */
+void rxrpc_unregister_security(struct rxrpc_security *sec)
+{
+
+ _enter("");
+ down_write(&rxrpc_security_sem);
+ list_del_init(&sec->link);
+ up_write(&rxrpc_security_sem);
+
+ printk(KERN_NOTICE "RxRPC: Unregistered security type %d '%s'\n",
+ sec->security_index, sec->name);
+}
+
+EXPORT_SYMBOL_GPL(rxrpc_unregister_security);
+
+/*
+ * initialise the security on a client connection
+ */
+int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
+{
+ struct rxrpc_key_token *token;
+ struct rxrpc_security *sec;
+ struct key *key = conn->key;
+ int ret;
+
+ _enter("{%d},{%x}", conn->debug_id, key_serial(key));
+
+ if (!key)
+ return 0;
+
+ ret = key_validate(key);
+ if (ret < 0)
+ return ret;
+
+ if (!key->payload.data)
+ return -EKEYREJECTED;
+ token = key->payload.data;
+
+ sec = rxrpc_security_lookup(token->security_index);
+ if (!sec)
+ return -EKEYREJECTED;
+ conn->security = sec;
+
+ ret = conn->security->init_connection_security(conn);
+ if (ret < 0) {
+ rxrpc_security_put(conn->security);
+ conn->security = NULL;
+ return ret;
+ }
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * initialise the security on a server connection
+ */
+int rxrpc_init_server_conn_security(struct rxrpc_connection *conn)
+{
+ struct rxrpc_security *sec;
+ struct rxrpc_local *local = conn->trans->local;
+ struct rxrpc_sock *rx;
+ struct key *key;
+ key_ref_t kref;
+ char kdesc[5+1+3+1];
+
+ _enter("");
+
+ sprintf(kdesc, "%u:%u", ntohs(conn->service_id), conn->security_ix);
+
+ sec = rxrpc_security_lookup(conn->security_ix);
+ if (!sec) {
+ _leave(" = -ENOKEY [lookup]");
+ return -ENOKEY;
+ }
+
+ /* find the service */
+ read_lock_bh(&local->services_lock);
+ list_for_each_entry(rx, &local->services, listen_link) {
+ if (rx->service_id == conn->service_id)
+ goto found_service;
+ }
+
+ /* the service appears to have died */
+ read_unlock_bh(&local->services_lock);
+ rxrpc_security_put(sec);
+ _leave(" = -ENOENT");
+ return -ENOENT;
+
+found_service:
+ if (!rx->securities) {
+ read_unlock_bh(&local->services_lock);
+ rxrpc_security_put(sec);
+ _leave(" = -ENOKEY");
+ return -ENOKEY;
+ }
+
+ /* look through the service's keyring */
+ kref = keyring_search(make_key_ref(rx->securities, 1UL),
+ &key_type_rxrpc_s, kdesc);
+ if (IS_ERR(kref)) {
+ read_unlock_bh(&local->services_lock);
+ rxrpc_security_put(sec);
+ _leave(" = %ld [search]", PTR_ERR(kref));
+ return PTR_ERR(kref);
+ }
+
+ key = key_ref_to_ptr(kref);
+ read_unlock_bh(&local->services_lock);
+
+ conn->server_key = key;
+ conn->security = sec;
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * secure a packet prior to transmission
+ */
+int rxrpc_secure_packet(const struct rxrpc_call *call,
+ struct sk_buff *skb,
+ size_t data_size,
+ void *sechdr)
+{
+ if (call->conn->security)
+ return call->conn->security->secure_packet(
+ call, skb, data_size, sechdr);
+ return 0;
+}
+
+/*
+ * secure a packet prior to transmission
+ */
+int rxrpc_verify_packet(const struct rxrpc_call *call, struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ if (call->conn->security)
+ return call->conn->security->verify_packet(
+ call, skb, _abort_code);
+ return 0;
+}
+
+/*
+ * clear connection security
+ */
+void rxrpc_clear_conn_security(struct rxrpc_connection *conn)
+{
+ _enter("{%d}", conn->debug_id);
+
+ if (conn->security) {
+ conn->security->clear(conn);
+ rxrpc_security_put(conn->security);
+ conn->security = NULL;
+ }
+
+ key_put(conn->key);
+ key_put(conn->server_key);
+}
diff --git a/net/rxrpc/ar-skbuff.c b/net/rxrpc/ar-skbuff.c
new file mode 100644
index 000000000..4cfab49e3
--- /dev/null
+++ b/net/rxrpc/ar-skbuff.c
@@ -0,0 +1,137 @@
+/* ar-skbuff.c: socket buffer destruction handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * set up for the ACK at the end of the receive phase when we discard the final
+ * receive phase data packet
+ * - called with softirqs disabled
+ */
+static void rxrpc_request_final_ACK(struct rxrpc_call *call)
+{
+ /* the call may be aborted before we have a chance to ACK it */
+ write_lock(&call->state_lock);
+
+ switch (call->state) {
+ case RXRPC_CALL_CLIENT_RECV_REPLY:
+ call->state = RXRPC_CALL_CLIENT_FINAL_ACK;
+ _debug("request final ACK");
+
+ /* get an extra ref on the call for the final-ACK generator to
+ * release */
+ rxrpc_get_call(call);
+ set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
+ if (try_to_del_timer_sync(&call->ack_timer) >= 0)
+ rxrpc_queue_call(call);
+ break;
+
+ case RXRPC_CALL_SERVER_RECV_REQUEST:
+ call->state = RXRPC_CALL_SERVER_ACK_REQUEST;
+ default:
+ break;
+ }
+
+ write_unlock(&call->state_lock);
+}
+
+/*
+ * drop the bottom ACK off of the call ACK window and advance the window
+ */
+static void rxrpc_hard_ACK_data(struct rxrpc_call *call,
+ struct rxrpc_skb_priv *sp)
+{
+ int loop;
+ u32 seq;
+
+ spin_lock_bh(&call->lock);
+
+ _debug("hard ACK #%u", ntohl(sp->hdr.seq));
+
+ for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) {
+ call->ackr_window[loop] >>= 1;
+ call->ackr_window[loop] |=
+ call->ackr_window[loop + 1] << (BITS_PER_LONG - 1);
+ }
+
+ seq = ntohl(sp->hdr.seq);
+ ASSERTCMP(seq, ==, call->rx_data_eaten + 1);
+ call->rx_data_eaten = seq;
+
+ if (call->ackr_win_top < UINT_MAX)
+ call->ackr_win_top++;
+
+ ASSERTIFCMP(call->state <= RXRPC_CALL_COMPLETE,
+ call->rx_data_post, >=, call->rx_data_recv);
+ ASSERTIFCMP(call->state <= RXRPC_CALL_COMPLETE,
+ call->rx_data_recv, >=, call->rx_data_eaten);
+
+ if (sp->hdr.flags & RXRPC_LAST_PACKET) {
+ rxrpc_request_final_ACK(call);
+ } else if (atomic_dec_and_test(&call->ackr_not_idle) &&
+ test_and_clear_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags)) {
+ /* We previously soft-ACK'd some received packets that have now
+ * been consumed, so send a hard-ACK if no more packets are
+ * immediately forthcoming to allow the transmitter to free up
+ * its Tx bufferage.
+ */
+ _debug("send Rx idle ACK");
+ __rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, sp->hdr.serial,
+ false);
+ }
+
+ spin_unlock_bh(&call->lock);
+}
+
+/*
+ * destroy a packet that has an RxRPC control buffer
+ * - advance the hard-ACK state of the parent call (done here in case something
+ * in the kernel bypasses recvmsg() and steals the packet directly off of the
+ * socket receive queue)
+ */
+void rxrpc_packet_destructor(struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct rxrpc_call *call = sp->call;
+
+ _enter("%p{%p}", skb, call);
+
+ if (call) {
+ /* send the final ACK on a client call */
+ if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA)
+ rxrpc_hard_ACK_data(call, sp);
+ rxrpc_put_call(call);
+ sp->call = NULL;
+ }
+
+ if (skb->sk)
+ sock_rfree(skb);
+ _leave("");
+}
+
+/**
+ * rxrpc_kernel_free_skb - Free an RxRPC socket buffer
+ * @skb: The socket buffer to be freed
+ *
+ * Let RxRPC free its own socket buffer, permitting it to maintain debug
+ * accounting.
+ */
+void rxrpc_kernel_free_skb(struct sk_buff *skb)
+{
+ rxrpc_free_skb(skb);
+}
+
+EXPORT_SYMBOL(rxrpc_kernel_free_skb);
diff --git a/net/rxrpc/ar-transport.c b/net/rxrpc/ar-transport.c
new file mode 100644
index 000000000..1976dec84
--- /dev/null
+++ b/net/rxrpc/ar-transport.c
@@ -0,0 +1,283 @@
+/* RxRPC point-to-point transport session management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * Time after last use at which transport record is cleaned up.
+ */
+unsigned rxrpc_transport_expiry = 3600 * 24;
+
+static void rxrpc_transport_reaper(struct work_struct *work);
+
+static LIST_HEAD(rxrpc_transports);
+static DEFINE_RWLOCK(rxrpc_transport_lock);
+static DECLARE_DELAYED_WORK(rxrpc_transport_reap, rxrpc_transport_reaper);
+
+/*
+ * allocate a new transport session manager
+ */
+static struct rxrpc_transport *rxrpc_alloc_transport(struct rxrpc_local *local,
+ struct rxrpc_peer *peer,
+ gfp_t gfp)
+{
+ struct rxrpc_transport *trans;
+
+ _enter("");
+
+ trans = kzalloc(sizeof(struct rxrpc_transport), gfp);
+ if (trans) {
+ trans->local = local;
+ trans->peer = peer;
+ INIT_LIST_HEAD(&trans->link);
+ trans->bundles = RB_ROOT;
+ trans->client_conns = RB_ROOT;
+ trans->server_conns = RB_ROOT;
+ skb_queue_head_init(&trans->error_queue);
+ spin_lock_init(&trans->client_lock);
+ rwlock_init(&trans->conn_lock);
+ atomic_set(&trans->usage, 1);
+ trans->debug_id = atomic_inc_return(&rxrpc_debug_id);
+
+ if (peer->srx.transport.family == AF_INET) {
+ switch (peer->srx.transport_type) {
+ case SOCK_DGRAM:
+ INIT_WORK(&trans->error_handler,
+ rxrpc_UDP_error_handler);
+ break;
+ default:
+ BUG();
+ break;
+ }
+ } else {
+ BUG();
+ }
+ }
+
+ _leave(" = %p", trans);
+ return trans;
+}
+
+/*
+ * obtain a transport session for the nominated endpoints
+ */
+struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *local,
+ struct rxrpc_peer *peer,
+ gfp_t gfp)
+{
+ struct rxrpc_transport *trans, *candidate;
+ const char *new = "old";
+ int usage;
+
+ _enter("{%pI4+%hu},{%pI4+%hu},",
+ &local->srx.transport.sin.sin_addr,
+ ntohs(local->srx.transport.sin.sin_port),
+ &peer->srx.transport.sin.sin_addr,
+ ntohs(peer->srx.transport.sin.sin_port));
+
+ /* search the transport list first */
+ read_lock_bh(&rxrpc_transport_lock);
+ list_for_each_entry(trans, &rxrpc_transports, link) {
+ if (trans->local == local && trans->peer == peer)
+ goto found_extant_transport;
+ }
+ read_unlock_bh(&rxrpc_transport_lock);
+
+ /* not yet present - create a candidate for a new record and then
+ * redo the search */
+ candidate = rxrpc_alloc_transport(local, peer, gfp);
+ if (!candidate) {
+ _leave(" = -ENOMEM");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ write_lock_bh(&rxrpc_transport_lock);
+
+ list_for_each_entry(trans, &rxrpc_transports, link) {
+ if (trans->local == local && trans->peer == peer)
+ goto found_extant_second;
+ }
+
+ /* we can now add the new candidate to the list */
+ trans = candidate;
+ candidate = NULL;
+ usage = atomic_read(&trans->usage);
+
+ rxrpc_get_local(trans->local);
+ atomic_inc(&trans->peer->usage);
+ list_add_tail(&trans->link, &rxrpc_transports);
+ write_unlock_bh(&rxrpc_transport_lock);
+ new = "new";
+
+success:
+ _net("TRANSPORT %s %d local %d -> peer %d",
+ new,
+ trans->debug_id,
+ trans->local->debug_id,
+ trans->peer->debug_id);
+
+ _leave(" = %p {u=%d}", trans, usage);
+ return trans;
+
+ /* we found the transport in the list immediately */
+found_extant_transport:
+ usage = atomic_inc_return(&trans->usage);
+ read_unlock_bh(&rxrpc_transport_lock);
+ goto success;
+
+ /* we found the transport on the second time through the list */
+found_extant_second:
+ usage = atomic_inc_return(&trans->usage);
+ write_unlock_bh(&rxrpc_transport_lock);
+ kfree(candidate);
+ goto success;
+}
+
+/*
+ * find the transport connecting two endpoints
+ */
+struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *local,
+ struct rxrpc_peer *peer)
+{
+ struct rxrpc_transport *trans;
+
+ _enter("{%pI4+%hu},{%pI4+%hu},",
+ &local->srx.transport.sin.sin_addr,
+ ntohs(local->srx.transport.sin.sin_port),
+ &peer->srx.transport.sin.sin_addr,
+ ntohs(peer->srx.transport.sin.sin_port));
+
+ /* search the transport list */
+ read_lock_bh(&rxrpc_transport_lock);
+
+ list_for_each_entry(trans, &rxrpc_transports, link) {
+ if (trans->local == local && trans->peer == peer)
+ goto found_extant_transport;
+ }
+
+ read_unlock_bh(&rxrpc_transport_lock);
+ _leave(" = NULL");
+ return NULL;
+
+found_extant_transport:
+ atomic_inc(&trans->usage);
+ read_unlock_bh(&rxrpc_transport_lock);
+ _leave(" = %p", trans);
+ return trans;
+}
+
+/*
+ * release a transport session
+ */
+void rxrpc_put_transport(struct rxrpc_transport *trans)
+{
+ _enter("%p{u=%d}", trans, atomic_read(&trans->usage));
+
+ ASSERTCMP(atomic_read(&trans->usage), >, 0);
+
+ trans->put_time = get_seconds();
+ if (unlikely(atomic_dec_and_test(&trans->usage))) {
+ _debug("zombie");
+ /* let the reaper determine the timeout to avoid a race with
+ * overextending the timeout if the reaper is running at the
+ * same time */
+ rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
+ }
+ _leave("");
+}
+
+/*
+ * clean up a transport session
+ */
+static void rxrpc_cleanup_transport(struct rxrpc_transport *trans)
+{
+ _net("DESTROY TRANS %d", trans->debug_id);
+
+ rxrpc_purge_queue(&trans->error_queue);
+
+ rxrpc_put_local(trans->local);
+ rxrpc_put_peer(trans->peer);
+ kfree(trans);
+}
+
+/*
+ * reap dead transports that have passed their expiry date
+ */
+static void rxrpc_transport_reaper(struct work_struct *work)
+{
+ struct rxrpc_transport *trans, *_p;
+ unsigned long now, earliest, reap_time;
+
+ LIST_HEAD(graveyard);
+
+ _enter("");
+
+ now = get_seconds();
+ earliest = ULONG_MAX;
+
+ /* extract all the transports that have been dead too long */
+ write_lock_bh(&rxrpc_transport_lock);
+ list_for_each_entry_safe(trans, _p, &rxrpc_transports, link) {
+ _debug("reap TRANS %d { u=%d t=%ld }",
+ trans->debug_id, atomic_read(&trans->usage),
+ (long) now - (long) trans->put_time);
+
+ if (likely(atomic_read(&trans->usage) > 0))
+ continue;
+
+ reap_time = trans->put_time + rxrpc_transport_expiry;
+ if (reap_time <= now)
+ list_move_tail(&trans->link, &graveyard);
+ else if (reap_time < earliest)
+ earliest = reap_time;
+ }
+ write_unlock_bh(&rxrpc_transport_lock);
+
+ if (earliest != ULONG_MAX) {
+ _debug("reschedule reaper %ld", (long) earliest - now);
+ ASSERTCMP(earliest, >, now);
+ rxrpc_queue_delayed_work(&rxrpc_transport_reap,
+ (earliest - now) * HZ);
+ }
+
+ /* then destroy all those pulled out */
+ while (!list_empty(&graveyard)) {
+ trans = list_entry(graveyard.next, struct rxrpc_transport,
+ link);
+ list_del_init(&trans->link);
+
+ ASSERTCMP(atomic_read(&trans->usage), ==, 0);
+ rxrpc_cleanup_transport(trans);
+ }
+
+ _leave("");
+}
+
+/*
+ * preemptively destroy all the transport session records rather than waiting
+ * for them to time out
+ */
+void __exit rxrpc_destroy_all_transports(void)
+{
+ _enter("");
+
+ rxrpc_transport_expiry = 0;
+ cancel_delayed_work(&rxrpc_transport_reap);
+ rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
+
+ _leave("");
+}
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
new file mode 100644
index 000000000..f226709eb
--- /dev/null
+++ b/net/rxrpc/rxkad.c
@@ -0,0 +1,1161 @@
+/* Kerberos-based RxRPC security
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <keys/rxrpc-type.h>
+#define rxrpc_debug rxkad_debug
+#include "ar-internal.h"
+
+#define RXKAD_VERSION 2
+#define MAXKRB5TICKETLEN 1024
+#define RXKAD_TKT_TYPE_KERBEROS_V5 256
+#define ANAME_SZ 40 /* size of authentication name */
+#define INST_SZ 40 /* size of principal's instance */
+#define REALM_SZ 40 /* size of principal's auth domain */
+#define SNAME_SZ 40 /* size of service name */
+
+unsigned int rxrpc_debug;
+module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(debug, "rxkad debugging mask");
+
+struct rxkad_level1_hdr {
+ __be32 data_size; /* true data size (excluding padding) */
+};
+
+struct rxkad_level2_hdr {
+ __be32 data_size; /* true data size (excluding padding) */
+ __be32 checksum; /* decrypted data checksum */
+};
+
+MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos 4)");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+/*
+ * this holds a pinned cipher so that keventd doesn't get called by the cipher
+ * alloc routine, but since we have it to hand, we use it to decrypt RESPONSE
+ * packets
+ */
+static struct crypto_blkcipher *rxkad_ci;
+static DEFINE_MUTEX(rxkad_ci_mutex);
+
+/*
+ * initialise connection security
+ */
+static int rxkad_init_connection_security(struct rxrpc_connection *conn)
+{
+ struct crypto_blkcipher *ci;
+ struct rxrpc_key_token *token;
+ int ret;
+
+ _enter("{%d},{%x}", conn->debug_id, key_serial(conn->key));
+
+ token = conn->key->payload.data;
+ conn->security_ix = token->security_index;
+
+ ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(ci)) {
+ _debug("no cipher");
+ ret = PTR_ERR(ci);
+ goto error;
+ }
+
+ if (crypto_blkcipher_setkey(ci, token->kad->session_key,
+ sizeof(token->kad->session_key)) < 0)
+ BUG();
+
+ switch (conn->security_level) {
+ case RXRPC_SECURITY_PLAIN:
+ break;
+ case RXRPC_SECURITY_AUTH:
+ conn->size_align = 8;
+ conn->security_size = sizeof(struct rxkad_level1_hdr);
+ conn->header_size += sizeof(struct rxkad_level1_hdr);
+ break;
+ case RXRPC_SECURITY_ENCRYPT:
+ conn->size_align = 8;
+ conn->security_size = sizeof(struct rxkad_level2_hdr);
+ conn->header_size += sizeof(struct rxkad_level2_hdr);
+ break;
+ default:
+ ret = -EKEYREJECTED;
+ goto error;
+ }
+
+ conn->cipher = ci;
+ ret = 0;
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * prime the encryption state with the invariant parts of a connection's
+ * description
+ */
+static void rxkad_prime_packet_security(struct rxrpc_connection *conn)
+{
+ struct rxrpc_key_token *token;
+ struct blkcipher_desc desc;
+ struct scatterlist sg[2];
+ struct rxrpc_crypt iv;
+ struct {
+ __be32 x[4];
+ } tmpbuf __attribute__((aligned(16))); /* must all be in same page */
+
+ _enter("");
+
+ if (!conn->key)
+ return;
+
+ token = conn->key->payload.data;
+ memcpy(&iv, token->kad->session_key, sizeof(iv));
+
+ desc.tfm = conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ tmpbuf.x[0] = conn->epoch;
+ tmpbuf.x[1] = conn->cid;
+ tmpbuf.x[2] = 0;
+ tmpbuf.x[3] = htonl(conn->security_ix);
+
+ sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf));
+ sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf));
+ crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+ memcpy(&conn->csum_iv, &tmpbuf.x[2], sizeof(conn->csum_iv));
+ ASSERTCMP(conn->csum_iv.n[0], ==, tmpbuf.x[2]);
+
+ _leave("");
+}
+
+/*
+ * partially encrypt a packet (level 1 security)
+ */
+static int rxkad_secure_packet_auth(const struct rxrpc_call *call,
+ struct sk_buff *skb,
+ u32 data_size,
+ void *sechdr)
+{
+ struct rxrpc_skb_priv *sp;
+ struct blkcipher_desc desc;
+ struct rxrpc_crypt iv;
+ struct scatterlist sg[2];
+ struct {
+ struct rxkad_level1_hdr hdr;
+ __be32 first; /* first four bytes of data and padding */
+ } tmpbuf __attribute__((aligned(8))); /* must all be in same page */
+ u16 check;
+
+ sp = rxrpc_skb(skb);
+
+ _enter("");
+
+ check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+ data_size |= (u32) check << 16;
+
+ tmpbuf.hdr.data_size = htonl(data_size);
+ memcpy(&tmpbuf.first, sechdr + 4, sizeof(tmpbuf.first));
+
+ /* start the encryption afresh */
+ memset(&iv, 0, sizeof(iv));
+ desc.tfm = call->conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf));
+ sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf));
+ crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+ memcpy(sechdr, &tmpbuf, sizeof(tmpbuf));
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * wholly encrypt a packet (level 2 security)
+ */
+static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,
+ struct sk_buff *skb,
+ u32 data_size,
+ void *sechdr)
+{
+ const struct rxrpc_key_token *token;
+ struct rxkad_level2_hdr rxkhdr
+ __attribute__((aligned(8))); /* must be all on one page */
+ struct rxrpc_skb_priv *sp;
+ struct blkcipher_desc desc;
+ struct rxrpc_crypt iv;
+ struct scatterlist sg[16];
+ struct sk_buff *trailer;
+ unsigned int len;
+ u16 check;
+ int nsg;
+
+ sp = rxrpc_skb(skb);
+
+ _enter("");
+
+ check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+
+ rxkhdr.data_size = htonl(data_size | (u32) check << 16);
+ rxkhdr.checksum = 0;
+
+ /* encrypt from the session key */
+ token = call->conn->key->payload.data;
+ memcpy(&iv, token->kad->session_key, sizeof(iv));
+ desc.tfm = call->conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ sg_init_one(&sg[0], sechdr, sizeof(rxkhdr));
+ sg_init_one(&sg[1], &rxkhdr, sizeof(rxkhdr));
+ crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(rxkhdr));
+
+ /* we want to encrypt the skbuff in-place */
+ nsg = skb_cow_data(skb, 0, &trailer);
+ if (nsg < 0 || nsg > 16)
+ return -ENOMEM;
+
+ len = data_size + call->conn->size_align - 1;
+ len &= ~(call->conn->size_align - 1);
+
+ sg_init_table(sg, nsg);
+ skb_to_sgvec(skb, sg, 0, len);
+ crypto_blkcipher_encrypt_iv(&desc, sg, sg, len);
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * checksum an RxRPC packet header
+ */
+static int rxkad_secure_packet(const struct rxrpc_call *call,
+ struct sk_buff *skb,
+ size_t data_size,
+ void *sechdr)
+{
+ struct rxrpc_skb_priv *sp;
+ struct blkcipher_desc desc;
+ struct rxrpc_crypt iv;
+ struct scatterlist sg[2];
+ struct {
+ __be32 x[2];
+ } tmpbuf __attribute__((aligned(8))); /* must all be in same page */
+ __be32 x;
+ u32 y;
+ int ret;
+
+ sp = rxrpc_skb(skb);
+
+ _enter("{%d{%x}},{#%u},%zu,",
+ call->debug_id, key_serial(call->conn->key), ntohl(sp->hdr.seq),
+ data_size);
+
+ if (!call->conn->cipher)
+ return 0;
+
+ ret = key_validate(call->conn->key);
+ if (ret < 0)
+ return ret;
+
+ /* continue encrypting from where we left off */
+ memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
+ desc.tfm = call->conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ /* calculate the security checksum */
+ x = htonl(call->channel << (32 - RXRPC_CIDSHIFT));
+ x |= sp->hdr.seq & cpu_to_be32(0x3fffffff);
+ tmpbuf.x[0] = sp->hdr.callNumber;
+ tmpbuf.x[1] = x;
+
+ sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf));
+ sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf));
+ crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+ y = ntohl(tmpbuf.x[1]);
+ y = (y >> 16) & 0xffff;
+ if (y == 0)
+ y = 1; /* zero checksums are not permitted */
+ sp->hdr.cksum = htons(y);
+
+ switch (call->conn->security_level) {
+ case RXRPC_SECURITY_PLAIN:
+ ret = 0;
+ break;
+ case RXRPC_SECURITY_AUTH:
+ ret = rxkad_secure_packet_auth(call, skb, data_size, sechdr);
+ break;
+ case RXRPC_SECURITY_ENCRYPT:
+ ret = rxkad_secure_packet_encrypt(call, skb, data_size,
+ sechdr);
+ break;
+ default:
+ ret = -EPERM;
+ break;
+ }
+
+ _leave(" = %d [set %hx]", ret, y);
+ return ret;
+}
+
+/*
+ * decrypt partial encryption on a packet (level 1 security)
+ */
+static int rxkad_verify_packet_auth(const struct rxrpc_call *call,
+ struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ struct rxkad_level1_hdr sechdr;
+ struct rxrpc_skb_priv *sp;
+ struct blkcipher_desc desc;
+ struct rxrpc_crypt iv;
+ struct scatterlist sg[16];
+ struct sk_buff *trailer;
+ u32 data_size, buf;
+ u16 check;
+ int nsg;
+
+ _enter("");
+
+ sp = rxrpc_skb(skb);
+
+ /* we want to decrypt the skbuff in-place */
+ nsg = skb_cow_data(skb, 0, &trailer);
+ if (nsg < 0 || nsg > 16)
+ goto nomem;
+
+ sg_init_table(sg, nsg);
+ skb_to_sgvec(skb, sg, 0, 8);
+
+ /* start the decryption afresh */
+ memset(&iv, 0, sizeof(iv));
+ desc.tfm = call->conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ crypto_blkcipher_decrypt_iv(&desc, sg, sg, 8);
+
+ /* remove the decrypted packet length */
+ if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0)
+ goto datalen_error;
+ if (!skb_pull(skb, sizeof(sechdr)))
+ BUG();
+
+ buf = ntohl(sechdr.data_size);
+ data_size = buf & 0xffff;
+
+ check = buf >> 16;
+ check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+ check &= 0xffff;
+ if (check != 0) {
+ *_abort_code = RXKADSEALEDINCON;
+ goto protocol_error;
+ }
+
+ /* shorten the packet to remove the padding */
+ if (data_size > skb->len)
+ goto datalen_error;
+ else if (data_size < skb->len)
+ skb->len = data_size;
+
+ _leave(" = 0 [dlen=%x]", data_size);
+ return 0;
+
+datalen_error:
+ *_abort_code = RXKADDATALEN;
+protocol_error:
+ _leave(" = -EPROTO");
+ return -EPROTO;
+
+nomem:
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+}
+
+/*
+ * wholly decrypt a packet (level 2 security)
+ */
+static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call,
+ struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ const struct rxrpc_key_token *token;
+ struct rxkad_level2_hdr sechdr;
+ struct rxrpc_skb_priv *sp;
+ struct blkcipher_desc desc;
+ struct rxrpc_crypt iv;
+ struct scatterlist _sg[4], *sg;
+ struct sk_buff *trailer;
+ u32 data_size, buf;
+ u16 check;
+ int nsg;
+
+ _enter(",{%d}", skb->len);
+
+ sp = rxrpc_skb(skb);
+
+ /* we want to decrypt the skbuff in-place */
+ nsg = skb_cow_data(skb, 0, &trailer);
+ if (nsg < 0)
+ goto nomem;
+
+ sg = _sg;
+ if (unlikely(nsg > 4)) {
+ sg = kmalloc(sizeof(*sg) * nsg, GFP_NOIO);
+ if (!sg)
+ goto nomem;
+ }
+
+ sg_init_table(sg, nsg);
+ skb_to_sgvec(skb, sg, 0, skb->len);
+
+ /* decrypt from the session key */
+ token = call->conn->key->payload.data;
+ memcpy(&iv, token->kad->session_key, sizeof(iv));
+ desc.tfm = call->conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ crypto_blkcipher_decrypt_iv(&desc, sg, sg, skb->len);
+ if (sg != _sg)
+ kfree(sg);
+
+ /* remove the decrypted packet length */
+ if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0)
+ goto datalen_error;
+ if (!skb_pull(skb, sizeof(sechdr)))
+ BUG();
+
+ buf = ntohl(sechdr.data_size);
+ data_size = buf & 0xffff;
+
+ check = buf >> 16;
+ check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+ check &= 0xffff;
+ if (check != 0) {
+ *_abort_code = RXKADSEALEDINCON;
+ goto protocol_error;
+ }
+
+ /* shorten the packet to remove the padding */
+ if (data_size > skb->len)
+ goto datalen_error;
+ else if (data_size < skb->len)
+ skb->len = data_size;
+
+ _leave(" = 0 [dlen=%x]", data_size);
+ return 0;
+
+datalen_error:
+ *_abort_code = RXKADDATALEN;
+protocol_error:
+ _leave(" = -EPROTO");
+ return -EPROTO;
+
+nomem:
+ _leave(" = -ENOMEM");
+ return -ENOMEM;
+}
+
+/*
+ * verify the security on a received packet
+ */
+static int rxkad_verify_packet(const struct rxrpc_call *call,
+ struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ struct blkcipher_desc desc;
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_crypt iv;
+ struct scatterlist sg[2];
+ struct {
+ __be32 x[2];
+ } tmpbuf __attribute__((aligned(8))); /* must all be in same page */
+ __be32 x;
+ __be16 cksum;
+ u32 y;
+ int ret;
+
+ sp = rxrpc_skb(skb);
+
+ _enter("{%d{%x}},{#%u}",
+ call->debug_id, key_serial(call->conn->key),
+ ntohl(sp->hdr.seq));
+
+ if (!call->conn->cipher)
+ return 0;
+
+ if (sp->hdr.securityIndex != RXRPC_SECURITY_RXKAD) {
+ *_abort_code = RXKADINCONSISTENCY;
+ _leave(" = -EPROTO [not rxkad]");
+ return -EPROTO;
+ }
+
+ /* continue encrypting from where we left off */
+ memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
+ desc.tfm = call->conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ /* validate the security checksum */
+ x = htonl(call->channel << (32 - RXRPC_CIDSHIFT));
+ x |= sp->hdr.seq & cpu_to_be32(0x3fffffff);
+ tmpbuf.x[0] = call->call_id;
+ tmpbuf.x[1] = x;
+
+ sg_init_one(&sg[0], &tmpbuf, sizeof(tmpbuf));
+ sg_init_one(&sg[1], &tmpbuf, sizeof(tmpbuf));
+ crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+ y = ntohl(tmpbuf.x[1]);
+ y = (y >> 16) & 0xffff;
+ if (y == 0)
+ y = 1; /* zero checksums are not permitted */
+
+ cksum = htons(y);
+ if (sp->hdr.cksum != cksum) {
+ *_abort_code = RXKADSEALEDINCON;
+ _leave(" = -EPROTO [csum failed]");
+ return -EPROTO;
+ }
+
+ switch (call->conn->security_level) {
+ case RXRPC_SECURITY_PLAIN:
+ ret = 0;
+ break;
+ case RXRPC_SECURITY_AUTH:
+ ret = rxkad_verify_packet_auth(call, skb, _abort_code);
+ break;
+ case RXRPC_SECURITY_ENCRYPT:
+ ret = rxkad_verify_packet_encrypt(call, skb, _abort_code);
+ break;
+ default:
+ ret = -ENOANO;
+ break;
+ }
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * issue a challenge
+ */
+static int rxkad_issue_challenge(struct rxrpc_connection *conn)
+{
+ struct rxkad_challenge challenge;
+ struct rxrpc_header hdr;
+ struct msghdr msg;
+ struct kvec iov[2];
+ size_t len;
+ int ret;
+
+ _enter("{%d,%x}", conn->debug_id, key_serial(conn->key));
+
+ ret = key_validate(conn->key);
+ if (ret < 0)
+ return ret;
+
+ get_random_bytes(&conn->security_nonce, sizeof(conn->security_nonce));
+
+ challenge.version = htonl(2);
+ challenge.nonce = htonl(conn->security_nonce);
+ challenge.min_level = htonl(0);
+ challenge.__padding = 0;
+
+ msg.msg_name = &conn->trans->peer->srx.transport.sin;
+ msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ hdr.epoch = conn->epoch;
+ hdr.cid = conn->cid;
+ hdr.callNumber = 0;
+ hdr.seq = 0;
+ hdr.type = RXRPC_PACKET_TYPE_CHALLENGE;
+ hdr.flags = conn->out_clientflag;
+ hdr.userStatus = 0;
+ hdr.securityIndex = conn->security_ix;
+ hdr._rsvd = 0;
+ hdr.serviceId = conn->service_id;
+
+ iov[0].iov_base = &hdr;
+ iov[0].iov_len = sizeof(hdr);
+ iov[1].iov_base = &challenge;
+ iov[1].iov_len = sizeof(challenge);
+
+ len = iov[0].iov_len + iov[1].iov_len;
+
+ hdr.serial = htonl(atomic_inc_return(&conn->serial));
+ _proto("Tx CHALLENGE %%%u", ntohl(hdr.serial));
+
+ ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len);
+ if (ret < 0) {
+ _debug("sendmsg failed: %d", ret);
+ return -EAGAIN;
+ }
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * send a Kerberos security response
+ */
+static int rxkad_send_response(struct rxrpc_connection *conn,
+ struct rxrpc_header *hdr,
+ struct rxkad_response *resp,
+ const struct rxkad_key *s2)
+{
+ struct msghdr msg;
+ struct kvec iov[3];
+ size_t len;
+ int ret;
+
+ _enter("");
+
+ msg.msg_name = &conn->trans->peer->srx.transport.sin;
+ msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = 0;
+
+ hdr->epoch = conn->epoch;
+ hdr->seq = 0;
+ hdr->type = RXRPC_PACKET_TYPE_RESPONSE;
+ hdr->flags = conn->out_clientflag;
+ hdr->userStatus = 0;
+ hdr->_rsvd = 0;
+
+ iov[0].iov_base = hdr;
+ iov[0].iov_len = sizeof(*hdr);
+ iov[1].iov_base = resp;
+ iov[1].iov_len = sizeof(*resp);
+ iov[2].iov_base = (void *) s2->ticket;
+ iov[2].iov_len = s2->ticket_len;
+
+ len = iov[0].iov_len + iov[1].iov_len + iov[2].iov_len;
+
+ hdr->serial = htonl(atomic_inc_return(&conn->serial));
+ _proto("Tx RESPONSE %%%u", ntohl(hdr->serial));
+
+ ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 3, len);
+ if (ret < 0) {
+ _debug("sendmsg failed: %d", ret);
+ return -EAGAIN;
+ }
+
+ _leave(" = 0");
+ return 0;
+}
+
+/*
+ * calculate the response checksum
+ */
+static void rxkad_calc_response_checksum(struct rxkad_response *response)
+{
+ u32 csum = 1000003;
+ int loop;
+ u8 *p = (u8 *) response;
+
+ for (loop = sizeof(*response); loop > 0; loop--)
+ csum = csum * 0x10204081 + *p++;
+
+ response->encrypted.checksum = htonl(csum);
+}
+
+/*
+ * load a scatterlist with a potentially split-page buffer
+ */
+static void rxkad_sg_set_buf2(struct scatterlist sg[2],
+ void *buf, size_t buflen)
+{
+ int nsg = 1;
+
+ sg_init_table(sg, 2);
+
+ sg_set_buf(&sg[0], buf, buflen);
+ if (sg[0].offset + buflen > PAGE_SIZE) {
+ /* the buffer was split over two pages */
+ sg[0].length = PAGE_SIZE - sg[0].offset;
+ sg_set_buf(&sg[1], buf + sg[0].length, buflen - sg[0].length);
+ nsg++;
+ }
+
+ sg_mark_end(&sg[nsg - 1]);
+
+ ASSERTCMP(sg[0].length + sg[1].length, ==, buflen);
+}
+
+/*
+ * encrypt the response packet
+ */
+static void rxkad_encrypt_response(struct rxrpc_connection *conn,
+ struct rxkad_response *resp,
+ const struct rxkad_key *s2)
+{
+ struct blkcipher_desc desc;
+ struct rxrpc_crypt iv;
+ struct scatterlist sg[2];
+
+ /* continue encrypting from where we left off */
+ memcpy(&iv, s2->session_key, sizeof(iv));
+ desc.tfm = conn->cipher;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ rxkad_sg_set_buf2(sg, &resp->encrypted, sizeof(resp->encrypted));
+ crypto_blkcipher_encrypt_iv(&desc, sg, sg, sizeof(resp->encrypted));
+}
+
+/*
+ * respond to a challenge packet
+ */
+static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
+ struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ const struct rxrpc_key_token *token;
+ struct rxkad_challenge challenge;
+ struct rxkad_response resp
+ __attribute__((aligned(8))); /* must be aligned for crypto */
+ struct rxrpc_skb_priv *sp;
+ u32 version, nonce, min_level, abort_code;
+ int ret;
+
+ _enter("{%d,%x}", conn->debug_id, key_serial(conn->key));
+
+ if (!conn->key) {
+ _leave(" = -EPROTO [no key]");
+ return -EPROTO;
+ }
+
+ ret = key_validate(conn->key);
+ if (ret < 0) {
+ *_abort_code = RXKADEXPIRED;
+ return ret;
+ }
+
+ abort_code = RXKADPACKETSHORT;
+ sp = rxrpc_skb(skb);
+ if (skb_copy_bits(skb, 0, &challenge, sizeof(challenge)) < 0)
+ goto protocol_error;
+
+ version = ntohl(challenge.version);
+ nonce = ntohl(challenge.nonce);
+ min_level = ntohl(challenge.min_level);
+
+ _proto("Rx CHALLENGE %%%u { v=%u n=%u ml=%u }",
+ ntohl(sp->hdr.serial), version, nonce, min_level);
+
+ abort_code = RXKADINCONSISTENCY;
+ if (version != RXKAD_VERSION)
+ goto protocol_error;
+
+ abort_code = RXKADLEVELFAIL;
+ if (conn->security_level < min_level)
+ goto protocol_error;
+
+ token = conn->key->payload.data;
+
+ /* build the response packet */
+ memset(&resp, 0, sizeof(resp));
+
+ resp.version = RXKAD_VERSION;
+ resp.encrypted.epoch = conn->epoch;
+ resp.encrypted.cid = conn->cid;
+ resp.encrypted.securityIndex = htonl(conn->security_ix);
+ resp.encrypted.call_id[0] =
+ (conn->channels[0] ? conn->channels[0]->call_id : 0);
+ resp.encrypted.call_id[1] =
+ (conn->channels[1] ? conn->channels[1]->call_id : 0);
+ resp.encrypted.call_id[2] =
+ (conn->channels[2] ? conn->channels[2]->call_id : 0);
+ resp.encrypted.call_id[3] =
+ (conn->channels[3] ? conn->channels[3]->call_id : 0);
+ resp.encrypted.inc_nonce = htonl(nonce + 1);
+ resp.encrypted.level = htonl(conn->security_level);
+ resp.kvno = htonl(token->kad->kvno);
+ resp.ticket_len = htonl(token->kad->ticket_len);
+
+ /* calculate the response checksum and then do the encryption */
+ rxkad_calc_response_checksum(&resp);
+ rxkad_encrypt_response(conn, &resp, token->kad);
+ return rxkad_send_response(conn, &sp->hdr, &resp, token->kad);
+
+protocol_error:
+ *_abort_code = abort_code;
+ _leave(" = -EPROTO [%d]", abort_code);
+ return -EPROTO;
+}
+
+/*
+ * decrypt the kerberos IV ticket in the response
+ */
+static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
+ void *ticket, size_t ticket_len,
+ struct rxrpc_crypt *_session_key,
+ time_t *_expiry,
+ u32 *_abort_code)
+{
+ struct blkcipher_desc desc;
+ struct rxrpc_crypt iv, key;
+ struct scatterlist sg[1];
+ struct in_addr addr;
+ unsigned int life;
+ time_t issue, now;
+ bool little_endian;
+ int ret;
+ u8 *p, *q, *name, *end;
+
+ _enter("{%d},{%x}", conn->debug_id, key_serial(conn->server_key));
+
+ *_expiry = 0;
+
+ ret = key_validate(conn->server_key);
+ if (ret < 0) {
+ switch (ret) {
+ case -EKEYEXPIRED:
+ *_abort_code = RXKADEXPIRED;
+ goto error;
+ default:
+ *_abort_code = RXKADNOAUTH;
+ goto error;
+ }
+ }
+
+ ASSERT(conn->server_key->payload.data != NULL);
+ ASSERTCMP((unsigned long) ticket & 7UL, ==, 0);
+
+ memcpy(&iv, &conn->server_key->type_data, sizeof(iv));
+
+ desc.tfm = conn->server_key->payload.data;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ sg_init_one(&sg[0], ticket, ticket_len);
+ crypto_blkcipher_decrypt_iv(&desc, sg, sg, ticket_len);
+
+ p = ticket;
+ end = p + ticket_len;
+
+#define Z(size) \
+ ({ \
+ u8 *__str = p; \
+ q = memchr(p, 0, end - p); \
+ if (!q || q - p > (size)) \
+ goto bad_ticket; \
+ for (; p < q; p++) \
+ if (!isprint(*p)) \
+ goto bad_ticket; \
+ p++; \
+ __str; \
+ })
+
+ /* extract the ticket flags */
+ _debug("KIV FLAGS: %x", *p);
+ little_endian = *p & 1;
+ p++;
+
+ /* extract the authentication name */
+ name = Z(ANAME_SZ);
+ _debug("KIV ANAME: %s", name);
+
+ /* extract the principal's instance */
+ name = Z(INST_SZ);
+ _debug("KIV INST : %s", name);
+
+ /* extract the principal's authentication domain */
+ name = Z(REALM_SZ);
+ _debug("KIV REALM: %s", name);
+
+ if (end - p < 4 + 8 + 4 + 2)
+ goto bad_ticket;
+
+ /* get the IPv4 address of the entity that requested the ticket */
+ memcpy(&addr, p, sizeof(addr));
+ p += 4;
+ _debug("KIV ADDR : %pI4", &addr);
+
+ /* get the session key from the ticket */
+ memcpy(&key, p, sizeof(key));
+ p += 8;
+ _debug("KIV KEY : %08x %08x", ntohl(key.n[0]), ntohl(key.n[1]));
+ memcpy(_session_key, &key, sizeof(key));
+
+ /* get the ticket's lifetime */
+ life = *p++ * 5 * 60;
+ _debug("KIV LIFE : %u", life);
+
+ /* get the issue time of the ticket */
+ if (little_endian) {
+ __le32 stamp;
+ memcpy(&stamp, p, 4);
+ issue = le32_to_cpu(stamp);
+ } else {
+ __be32 stamp;
+ memcpy(&stamp, p, 4);
+ issue = be32_to_cpu(stamp);
+ }
+ p += 4;
+ now = get_seconds();
+ _debug("KIV ISSUE: %lx [%lx]", issue, now);
+
+ /* check the ticket is in date */
+ if (issue > now) {
+ *_abort_code = RXKADNOAUTH;
+ ret = -EKEYREJECTED;
+ goto error;
+ }
+
+ if (issue < now - life) {
+ *_abort_code = RXKADEXPIRED;
+ ret = -EKEYEXPIRED;
+ goto error;
+ }
+
+ *_expiry = issue + life;
+
+ /* get the service name */
+ name = Z(SNAME_SZ);
+ _debug("KIV SNAME: %s", name);
+
+ /* get the service instance name */
+ name = Z(INST_SZ);
+ _debug("KIV SINST: %s", name);
+
+ ret = 0;
+error:
+ _leave(" = %d", ret);
+ return ret;
+
+bad_ticket:
+ *_abort_code = RXKADBADTICKET;
+ ret = -EBADMSG;
+ goto error;
+}
+
+/*
+ * decrypt the response packet
+ */
+static void rxkad_decrypt_response(struct rxrpc_connection *conn,
+ struct rxkad_response *resp,
+ const struct rxrpc_crypt *session_key)
+{
+ struct blkcipher_desc desc;
+ struct scatterlist sg[2];
+ struct rxrpc_crypt iv;
+
+ _enter(",,%08x%08x",
+ ntohl(session_key->n[0]), ntohl(session_key->n[1]));
+
+ ASSERT(rxkad_ci != NULL);
+
+ mutex_lock(&rxkad_ci_mutex);
+ if (crypto_blkcipher_setkey(rxkad_ci, session_key->x,
+ sizeof(*session_key)) < 0)
+ BUG();
+
+ memcpy(&iv, session_key, sizeof(iv));
+ desc.tfm = rxkad_ci;
+ desc.info = iv.x;
+ desc.flags = 0;
+
+ rxkad_sg_set_buf2(sg, &resp->encrypted, sizeof(resp->encrypted));
+ crypto_blkcipher_decrypt_iv(&desc, sg, sg, sizeof(resp->encrypted));
+ mutex_unlock(&rxkad_ci_mutex);
+
+ _leave("");
+}
+
+/*
+ * verify a response
+ */
+static int rxkad_verify_response(struct rxrpc_connection *conn,
+ struct sk_buff *skb,
+ u32 *_abort_code)
+{
+ struct rxkad_response response
+ __attribute__((aligned(8))); /* must be aligned for crypto */
+ struct rxrpc_skb_priv *sp;
+ struct rxrpc_crypt session_key;
+ time_t expiry;
+ void *ticket;
+ u32 abort_code, version, kvno, ticket_len, level;
+ __be32 csum;
+ int ret;
+
+ _enter("{%d,%x}", conn->debug_id, key_serial(conn->server_key));
+
+ abort_code = RXKADPACKETSHORT;
+ if (skb_copy_bits(skb, 0, &response, sizeof(response)) < 0)
+ goto protocol_error;
+ if (!pskb_pull(skb, sizeof(response)))
+ BUG();
+
+ version = ntohl(response.version);
+ ticket_len = ntohl(response.ticket_len);
+ kvno = ntohl(response.kvno);
+ sp = rxrpc_skb(skb);
+ _proto("Rx RESPONSE %%%u { v=%u kv=%u tl=%u }",
+ ntohl(sp->hdr.serial), version, kvno, ticket_len);
+
+ abort_code = RXKADINCONSISTENCY;
+ if (version != RXKAD_VERSION)
+ goto protocol_error;
+
+ abort_code = RXKADTICKETLEN;
+ if (ticket_len < 4 || ticket_len > MAXKRB5TICKETLEN)
+ goto protocol_error;
+
+ abort_code = RXKADUNKNOWNKEY;
+ if (kvno >= RXKAD_TKT_TYPE_KERBEROS_V5)
+ goto protocol_error;
+
+ /* extract the kerberos ticket and decrypt and decode it */
+ ticket = kmalloc(ticket_len, GFP_NOFS);
+ if (!ticket)
+ return -ENOMEM;
+
+ abort_code = RXKADPACKETSHORT;
+ if (skb_copy_bits(skb, 0, ticket, ticket_len) < 0)
+ goto protocol_error_free;
+
+ ret = rxkad_decrypt_ticket(conn, ticket, ticket_len, &session_key,
+ &expiry, &abort_code);
+ if (ret < 0) {
+ *_abort_code = abort_code;
+ kfree(ticket);
+ return ret;
+ }
+
+ /* use the session key from inside the ticket to decrypt the
+ * response */
+ rxkad_decrypt_response(conn, &response, &session_key);
+
+ abort_code = RXKADSEALEDINCON;
+ if (response.encrypted.epoch != conn->epoch)
+ goto protocol_error_free;
+ if (response.encrypted.cid != conn->cid)
+ goto protocol_error_free;
+ if (ntohl(response.encrypted.securityIndex) != conn->security_ix)
+ goto protocol_error_free;
+ csum = response.encrypted.checksum;
+ response.encrypted.checksum = 0;
+ rxkad_calc_response_checksum(&response);
+ if (response.encrypted.checksum != csum)
+ goto protocol_error_free;
+
+ if (ntohl(response.encrypted.call_id[0]) > INT_MAX ||
+ ntohl(response.encrypted.call_id[1]) > INT_MAX ||
+ ntohl(response.encrypted.call_id[2]) > INT_MAX ||
+ ntohl(response.encrypted.call_id[3]) > INT_MAX)
+ goto protocol_error_free;
+
+ abort_code = RXKADOUTOFSEQUENCE;
+ if (response.encrypted.inc_nonce != htonl(conn->security_nonce + 1))
+ goto protocol_error_free;
+
+ abort_code = RXKADLEVELFAIL;
+ level = ntohl(response.encrypted.level);
+ if (level > RXRPC_SECURITY_ENCRYPT)
+ goto protocol_error_free;
+ conn->security_level = level;
+
+ /* create a key to hold the security data and expiration time - after
+ * this the connection security can be handled in exactly the same way
+ * as for a client connection */
+ ret = rxrpc_get_server_data_key(conn, &session_key, expiry, kvno);
+ if (ret < 0) {
+ kfree(ticket);
+ return ret;
+ }
+
+ kfree(ticket);
+ _leave(" = 0");
+ return 0;
+
+protocol_error_free:
+ kfree(ticket);
+protocol_error:
+ *_abort_code = abort_code;
+ _leave(" = -EPROTO [%d]", abort_code);
+ return -EPROTO;
+}
+
+/*
+ * clear the connection security
+ */
+static void rxkad_clear(struct rxrpc_connection *conn)
+{
+ _enter("");
+
+ if (conn->cipher)
+ crypto_free_blkcipher(conn->cipher);
+}
+
+/*
+ * RxRPC Kerberos-based security
+ */
+static struct rxrpc_security rxkad = {
+ .owner = THIS_MODULE,
+ .name = "rxkad",
+ .security_index = RXRPC_SECURITY_RXKAD,
+ .init_connection_security = rxkad_init_connection_security,
+ .prime_packet_security = rxkad_prime_packet_security,
+ .secure_packet = rxkad_secure_packet,
+ .verify_packet = rxkad_verify_packet,
+ .issue_challenge = rxkad_issue_challenge,
+ .respond_to_challenge = rxkad_respond_to_challenge,
+ .verify_response = rxkad_verify_response,
+ .clear = rxkad_clear,
+};
+
+static __init int rxkad_init(void)
+{
+ _enter("");
+
+ /* pin the cipher we need so that the crypto layer doesn't invoke
+ * keventd to go get it */
+ rxkad_ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(rxkad_ci))
+ return PTR_ERR(rxkad_ci);
+
+ return rxrpc_register_security(&rxkad);
+}
+
+module_init(rxkad_init);
+
+static __exit void rxkad_exit(void)
+{
+ _enter("");
+
+ rxrpc_unregister_security(&rxkad);
+ crypto_free_blkcipher(rxkad_ci);
+}
+
+module_exit(rxkad_exit);
diff --git a/net/rxrpc/sysctl.c b/net/rxrpc/sysctl.c
new file mode 100644
index 000000000..50a98a910
--- /dev/null
+++ b/net/rxrpc/sysctl.c
@@ -0,0 +1,146 @@
+/* sysctls for configuring RxRPC operating parameters
+ *
+ * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/sysctl.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static struct ctl_table_header *rxrpc_sysctl_reg_table;
+static const unsigned zero = 0;
+static const unsigned one = 1;
+static const unsigned four = 4;
+static const unsigned n_65535 = 65535;
+static const unsigned n_max_acks = RXRPC_MAXACKS;
+
+/*
+ * RxRPC operating parameters.
+ *
+ * See Documentation/networking/rxrpc.txt and the variable definitions for more
+ * information on the individual parameters.
+ */
+static struct ctl_table rxrpc_sysctl_table[] = {
+ /* Values measured in milliseconds */
+ {
+ .procname = "req_ack_delay",
+ .data = &rxrpc_requested_ack_delay,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ .extra1 = (void *)&zero,
+ },
+ {
+ .procname = "soft_ack_delay",
+ .data = &rxrpc_soft_ack_delay,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ .extra1 = (void *)&one,
+ },
+ {
+ .procname = "idle_ack_delay",
+ .data = &rxrpc_idle_ack_delay,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ .extra1 = (void *)&one,
+ },
+ {
+ .procname = "resend_timeout",
+ .data = &rxrpc_resend_timeout,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ .extra1 = (void *)&one,
+ },
+
+ /* Values measured in seconds but used in jiffies */
+ {
+ .procname = "max_call_lifetime",
+ .data = &rxrpc_max_call_lifetime,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ .extra1 = (void *)&one,
+ },
+ {
+ .procname = "dead_call_expiry",
+ .data = &rxrpc_dead_call_expiry,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ .extra1 = (void *)&one,
+ },
+
+ /* Values measured in seconds */
+ {
+ .procname = "connection_expiry",
+ .data = &rxrpc_connection_expiry,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&one,
+ },
+ {
+ .procname = "transport_expiry",
+ .data = &rxrpc_transport_expiry,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&one,
+ },
+
+ /* Non-time values */
+ {
+ .procname = "rx_window_size",
+ .data = &rxrpc_rx_window_size,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&one,
+ .extra2 = (void *)&n_max_acks,
+ },
+ {
+ .procname = "rx_mtu",
+ .data = &rxrpc_rx_mtu,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&one,
+ .extra1 = (void *)&n_65535,
+ },
+ {
+ .procname = "rx_jumbo_max",
+ .data = &rxrpc_rx_jumbo_max,
+ .maxlen = sizeof(unsigned),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = (void *)&one,
+ .extra2 = (void *)&four,
+ },
+
+ { }
+};
+
+int __init rxrpc_sysctl_init(void)
+{
+ rxrpc_sysctl_reg_table = register_net_sysctl(&init_net, "net/rxrpc",
+ rxrpc_sysctl_table);
+ if (!rxrpc_sysctl_reg_table)
+ return -ENOMEM;
+ return 0;
+}
+
+void rxrpc_sysctl_exit(void)
+{
+ if (rxrpc_sysctl_reg_table)
+ unregister_net_sysctl_table(rxrpc_sysctl_reg_table);
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-16 22:10:53 +0000