diff options
Diffstat (limited to 'net/rxrpc/ar-accept.c')
| -rw-r--r-- | net/rxrpc/ar-accept.c | 516 |
1 files changed, 0 insertions, 516 deletions
diff --git a/net/rxrpc/ar-accept.c b/net/rxrpc/ar-accept.c deleted file mode 100644 index e7a7f05f1..000000000 --- a/net/rxrpc/ar-accept.c +++ /dev/null @@ -1,516 +0,0 @@ -/* 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_wire_header *whdr) -{ - struct msghdr msg; - struct kvec iov[1]; - size_t len; - int ret; - - _enter("%d,,", local->debug_id); - - whdr->type = RXRPC_PACKET_TYPE_BUSY; - whdr->serial = htonl(1); - - 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; - - iov[0].iov_base = whdr; - iov[0].iov_len = sizeof(*whdr); - - len = iov[0].iov_len; - - _proto("Tx BUSY %%1"); - - 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); - 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); - 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_RELEASED, &call->flags) && - !test_and_set_bit(RXRPC_CALL_EV_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 rxrpc_wire_header whdr; - struct sk_buff *skb; - 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); - - /* Set up a response packet header in case we need it */ - whdr.epoch = htonl(sp->hdr.epoch); - whdr.cid = htonl(sp->hdr.cid); - whdr.callNumber = htonl(sp->hdr.callNumber); - whdr.seq = htonl(sp->hdr.seq); - whdr.serial = 0; - whdr.flags = 0; - whdr.type = 0; - whdr.userStatus = 0; - whdr.securityIndex = sp->hdr.securityIndex; - whdr._rsvd = 0; - whdr.serviceId = htons(sp->hdr.serviceId); - - /* 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 */ - read_lock_bh(&local->services_lock); - list_for_each_entry(rx, &local->services, listen_link) { - if (rx->srx.srx_service == sp->hdr.serviceId && - rx->sk.sk_state != RXRPC_CLOSE) - goto found_service; - } - read_unlock_bh(&local->services_lock); - goto invalid_service; - -found_service: - _debug("found service %hd", rx->srx.srx_service); - 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, &whdr); - 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_EV_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_EV_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 rejection 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_EV_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_EV_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); |