diff options
Diffstat (limited to 'net/bluetooth/rfcomm/sock.c')
| -rw-r--r-- | net/bluetooth/rfcomm/sock.c | 1104 |
1 files changed, 1104 insertions, 0 deletions
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c new file mode 100644 index 000000000..825e8fb51 --- /dev/null +++ b/net/bluetooth/rfcomm/sock.c @@ -0,0 +1,1104 @@ +/* + RFCOMM implementation for Linux Bluetooth stack (BlueZ). + Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> + Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as + published by the Free Software Foundation; + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY + CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, + COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS + SOFTWARE IS DISCLAIMED. +*/ + +/* + * RFCOMM sockets. + */ + +#include <linux/export.h> +#include <linux/debugfs.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> +#include <net/bluetooth/l2cap.h> +#include <net/bluetooth/rfcomm.h> + +static const struct proto_ops rfcomm_sock_ops; + +static struct bt_sock_list rfcomm_sk_list = { + .lock = __RW_LOCK_UNLOCKED(rfcomm_sk_list.lock) +}; + +static void rfcomm_sock_close(struct sock *sk); +static void rfcomm_sock_kill(struct sock *sk); + +/* ---- DLC callbacks ---- + * + * called under rfcomm_dlc_lock() + */ +static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb) +{ + struct sock *sk = d->owner; + if (!sk) + return; + + atomic_add(skb->len, &sk->sk_rmem_alloc); + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_data_ready(sk); + + if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) + rfcomm_dlc_throttle(d); +} + +static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err) +{ + struct sock *sk = d->owner, *parent; + unsigned long flags; + + if (!sk) + return; + + BT_DBG("dlc %p state %ld err %d", d, d->state, err); + + local_irq_save(flags); + bh_lock_sock(sk); + + if (err) + sk->sk_err = err; + + sk->sk_state = d->state; + + parent = bt_sk(sk)->parent; + if (parent) { + if (d->state == BT_CLOSED) { + sock_set_flag(sk, SOCK_ZAPPED); + bt_accept_unlink(sk); + } + parent->sk_data_ready(parent); + } else { + if (d->state == BT_CONNECTED) + rfcomm_session_getaddr(d->session, + &rfcomm_pi(sk)->src, NULL); + sk->sk_state_change(sk); + } + + bh_unlock_sock(sk); + local_irq_restore(flags); + + if (parent && sock_flag(sk, SOCK_ZAPPED)) { + /* We have to drop DLC lock here, otherwise + * rfcomm_sock_destruct() will dead lock. */ + rfcomm_dlc_unlock(d); + rfcomm_sock_kill(sk); + rfcomm_dlc_lock(d); + } +} + +/* ---- Socket functions ---- */ +static struct sock *__rfcomm_get_listen_sock_by_addr(u8 channel, bdaddr_t *src) +{ + struct sock *sk = NULL; + + sk_for_each(sk, &rfcomm_sk_list.head) { + if (rfcomm_pi(sk)->channel != channel) + continue; + + if (bacmp(&rfcomm_pi(sk)->src, src)) + continue; + + if (sk->sk_state == BT_BOUND || sk->sk_state == BT_LISTEN) + break; + } + + return sk ? sk : NULL; +} + +/* Find socket with channel and source bdaddr. + * Returns closest match. + */ +static struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src) +{ + struct sock *sk = NULL, *sk1 = NULL; + + read_lock(&rfcomm_sk_list.lock); + + sk_for_each(sk, &rfcomm_sk_list.head) { + if (state && sk->sk_state != state) + continue; + + if (rfcomm_pi(sk)->channel == channel) { + /* Exact match. */ + if (!bacmp(&rfcomm_pi(sk)->src, src)) + break; + + /* Closest match */ + if (!bacmp(&rfcomm_pi(sk)->src, BDADDR_ANY)) + sk1 = sk; + } + } + + read_unlock(&rfcomm_sk_list.lock); + + return sk ? sk : sk1; +} + +static void rfcomm_sock_destruct(struct sock *sk) +{ + struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; + + BT_DBG("sk %p dlc %p", sk, d); + + skb_queue_purge(&sk->sk_receive_queue); + skb_queue_purge(&sk->sk_write_queue); + + rfcomm_dlc_lock(d); + rfcomm_pi(sk)->dlc = NULL; + + /* Detach DLC if it's owned by this socket */ + if (d->owner == sk) + d->owner = NULL; + rfcomm_dlc_unlock(d); + + rfcomm_dlc_put(d); +} + +static void rfcomm_sock_cleanup_listen(struct sock *parent) +{ + struct sock *sk; + + BT_DBG("parent %p", parent); + + /* Close not yet accepted dlcs */ + while ((sk = bt_accept_dequeue(parent, NULL))) { + rfcomm_sock_close(sk); + rfcomm_sock_kill(sk); + } + + parent->sk_state = BT_CLOSED; + sock_set_flag(parent, SOCK_ZAPPED); +} + +/* Kill socket (only if zapped and orphan) + * Must be called on unlocked socket. + */ +static void rfcomm_sock_kill(struct sock *sk) +{ + if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) + return; + + BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); + + /* Kill poor orphan */ + bt_sock_unlink(&rfcomm_sk_list, sk); + sock_set_flag(sk, SOCK_DEAD); + sock_put(sk); +} + +static void __rfcomm_sock_close(struct sock *sk) +{ + struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; + + BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); + + switch (sk->sk_state) { + case BT_LISTEN: + rfcomm_sock_cleanup_listen(sk); + break; + + case BT_CONNECT: + case BT_CONNECT2: + case BT_CONFIG: + case BT_CONNECTED: + rfcomm_dlc_close(d, 0); + + default: + sock_set_flag(sk, SOCK_ZAPPED); + break; + } +} + +/* Close socket. + * Must be called on unlocked socket. + */ +static void rfcomm_sock_close(struct sock *sk) +{ + lock_sock(sk); + __rfcomm_sock_close(sk); + release_sock(sk); +} + +static void rfcomm_sock_init(struct sock *sk, struct sock *parent) +{ + struct rfcomm_pinfo *pi = rfcomm_pi(sk); + + BT_DBG("sk %p", sk); + + if (parent) { + sk->sk_type = parent->sk_type; + pi->dlc->defer_setup = test_bit(BT_SK_DEFER_SETUP, + &bt_sk(parent)->flags); + + pi->sec_level = rfcomm_pi(parent)->sec_level; + pi->role_switch = rfcomm_pi(parent)->role_switch; + + security_sk_clone(parent, sk); + } else { + pi->dlc->defer_setup = 0; + + pi->sec_level = BT_SECURITY_LOW; + pi->role_switch = 0; + } + + pi->dlc->sec_level = pi->sec_level; + pi->dlc->role_switch = pi->role_switch; +} + +static struct proto rfcomm_proto = { + .name = "RFCOMM", + .owner = THIS_MODULE, + .obj_size = sizeof(struct rfcomm_pinfo) +}; + +static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) +{ + struct rfcomm_dlc *d; + struct sock *sk; + + sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto); + if (!sk) + return NULL; + + sock_init_data(sock, sk); + INIT_LIST_HEAD(&bt_sk(sk)->accept_q); + + d = rfcomm_dlc_alloc(prio); + if (!d) { + sk_free(sk); + return NULL; + } + + d->data_ready = rfcomm_sk_data_ready; + d->state_change = rfcomm_sk_state_change; + + rfcomm_pi(sk)->dlc = d; + d->owner = sk; + + sk->sk_destruct = rfcomm_sock_destruct; + sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT; + + sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; + sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10; + + sock_reset_flag(sk, SOCK_ZAPPED); + + sk->sk_protocol = proto; + sk->sk_state = BT_OPEN; + + bt_sock_link(&rfcomm_sk_list, sk); + + BT_DBG("sk %p", sk); + return sk; +} + +static int rfcomm_sock_create(struct net *net, struct socket *sock, + int protocol, int kern) +{ + struct sock *sk; + + BT_DBG("sock %p", sock); + + sock->state = SS_UNCONNECTED; + + if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW) + return -ESOCKTNOSUPPORT; + + sock->ops = &rfcomm_sock_ops; + + sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC); + if (!sk) + return -ENOMEM; + + rfcomm_sock_init(sk, NULL); + return 0; +} + +static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) +{ + struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; + struct sock *sk = sock->sk; + int chan = sa->rc_channel; + int err = 0; + + BT_DBG("sk %p %pMR", sk, &sa->rc_bdaddr); + + if (!addr || addr->sa_family != AF_BLUETOOTH) + return -EINVAL; + + lock_sock(sk); + + if (sk->sk_state != BT_OPEN) { + err = -EBADFD; + goto done; + } + + if (sk->sk_type != SOCK_STREAM) { + err = -EINVAL; + goto done; + } + + write_lock(&rfcomm_sk_list.lock); + + if (chan && __rfcomm_get_listen_sock_by_addr(chan, &sa->rc_bdaddr)) { + err = -EADDRINUSE; + } else { + /* Save source address */ + bacpy(&rfcomm_pi(sk)->src, &sa->rc_bdaddr); + rfcomm_pi(sk)->channel = chan; + sk->sk_state = BT_BOUND; + } + + write_unlock(&rfcomm_sk_list.lock); + +done: + release_sock(sk); + return err; +} + +static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) +{ + struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; + struct sock *sk = sock->sk; + struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; + int err = 0; + + BT_DBG("sk %p", sk); + + if (alen < sizeof(struct sockaddr_rc) || + addr->sa_family != AF_BLUETOOTH) + return -EINVAL; + + lock_sock(sk); + + if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) { + err = -EBADFD; + goto done; + } + + if (sk->sk_type != SOCK_STREAM) { + err = -EINVAL; + goto done; + } + + sk->sk_state = BT_CONNECT; + bacpy(&rfcomm_pi(sk)->dst, &sa->rc_bdaddr); + rfcomm_pi(sk)->channel = sa->rc_channel; + + d->sec_level = rfcomm_pi(sk)->sec_level; + d->role_switch = rfcomm_pi(sk)->role_switch; + + err = rfcomm_dlc_open(d, &rfcomm_pi(sk)->src, &sa->rc_bdaddr, + sa->rc_channel); + if (!err) + err = bt_sock_wait_state(sk, BT_CONNECTED, + sock_sndtimeo(sk, flags & O_NONBLOCK)); + +done: + release_sock(sk); + return err; +} + +static int rfcomm_sock_listen(struct socket *sock, int backlog) +{ + struct sock *sk = sock->sk; + int err = 0; + + BT_DBG("sk %p backlog %d", sk, backlog); + + lock_sock(sk); + + if (sk->sk_state != BT_BOUND) { + err = -EBADFD; + goto done; + } + + if (sk->sk_type != SOCK_STREAM) { + err = -EINVAL; + goto done; + } + + if (!rfcomm_pi(sk)->channel) { + bdaddr_t *src = &rfcomm_pi(sk)->src; + u8 channel; + + err = -EINVAL; + + write_lock(&rfcomm_sk_list.lock); + + for (channel = 1; channel < 31; channel++) + if (!__rfcomm_get_listen_sock_by_addr(channel, src)) { + rfcomm_pi(sk)->channel = channel; + err = 0; + break; + } + + write_unlock(&rfcomm_sk_list.lock); + + if (err < 0) + goto done; + } + + sk->sk_max_ack_backlog = backlog; + sk->sk_ack_backlog = 0; + sk->sk_state = BT_LISTEN; + +done: + release_sock(sk); + return err; +} + +static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags) +{ + DEFINE_WAIT_FUNC(wait, woken_wake_function); + struct sock *sk = sock->sk, *nsk; + long timeo; + int err = 0; + + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + + if (sk->sk_type != SOCK_STREAM) { + err = -EINVAL; + goto done; + } + + timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); + + BT_DBG("sk %p timeo %ld", sk, timeo); + + /* Wait for an incoming connection. (wake-one). */ + add_wait_queue_exclusive(sk_sleep(sk), &wait); + while (1) { + if (sk->sk_state != BT_LISTEN) { + err = -EBADFD; + break; + } + + nsk = bt_accept_dequeue(sk, newsock); + if (nsk) + break; + + if (!timeo) { + err = -EAGAIN; + break; + } + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + + timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); + + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + } + remove_wait_queue(sk_sleep(sk), &wait); + + if (err) + goto done; + + newsock->state = SS_CONNECTED; + + BT_DBG("new socket %p", nsk); + +done: + release_sock(sk); + return err; +} + +static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) +{ + struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; + struct sock *sk = sock->sk; + + BT_DBG("sock %p, sk %p", sock, sk); + + if (peer && sk->sk_state != BT_CONNECTED && + sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2) + return -ENOTCONN; + + memset(sa, 0, sizeof(*sa)); + sa->rc_family = AF_BLUETOOTH; + sa->rc_channel = rfcomm_pi(sk)->channel; + if (peer) + bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->dst); + else + bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->src); + + *len = sizeof(struct sockaddr_rc); + return 0; +} + +static int rfcomm_sock_sendmsg(struct socket *sock, struct msghdr *msg, + size_t len) +{ + struct sock *sk = sock->sk; + struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; + struct sk_buff *skb; + int sent; + + if (test_bit(RFCOMM_DEFER_SETUP, &d->flags)) + return -ENOTCONN; + + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + if (sk->sk_shutdown & SEND_SHUTDOWN) + return -EPIPE; + + BT_DBG("sock %p, sk %p", sock, sk); + + lock_sock(sk); + + sent = bt_sock_wait_ready(sk, msg->msg_flags); + if (sent) + goto done; + + while (len) { + size_t size = min_t(size_t, len, d->mtu); + int err; + + skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) { + if (sent == 0) + sent = err; + break; + } + skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE); + + err = memcpy_from_msg(skb_put(skb, size), msg, size); + if (err) { + kfree_skb(skb); + if (sent == 0) + sent = err; + break; + } + + skb->priority = sk->sk_priority; + + err = rfcomm_dlc_send(d, skb); + if (err < 0) { + kfree_skb(skb); + if (sent == 0) + sent = err; + break; + } + + sent += size; + len -= size; + } + +done: + release_sock(sk); + + return sent; +} + +static int rfcomm_sock_recvmsg(struct socket *sock, struct msghdr *msg, + size_t size, int flags) +{ + struct sock *sk = sock->sk; + struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; + int len; + + if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { + rfcomm_dlc_accept(d); + return 0; + } + + len = bt_sock_stream_recvmsg(sock, msg, size, flags); + + lock_sock(sk); + if (!(flags & MSG_PEEK) && len > 0) + atomic_sub(len, &sk->sk_rmem_alloc); + + if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2)) + rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc); + release_sock(sk); + + return len; +} + +static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + int err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + lock_sock(sk); + + switch (optname) { + case RFCOMM_LM: + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + if (opt & RFCOMM_LM_FIPS) { + err = -EINVAL; + break; + } + + if (opt & RFCOMM_LM_AUTH) + rfcomm_pi(sk)->sec_level = BT_SECURITY_LOW; + if (opt & RFCOMM_LM_ENCRYPT) + rfcomm_pi(sk)->sec_level = BT_SECURITY_MEDIUM; + if (opt & RFCOMM_LM_SECURE) + rfcomm_pi(sk)->sec_level = BT_SECURITY_HIGH; + + rfcomm_pi(sk)->role_switch = (opt & RFCOMM_LM_MASTER); + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + struct bt_security sec; + int err = 0; + size_t len; + u32 opt; + + BT_DBG("sk %p", sk); + + if (level == SOL_RFCOMM) + return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen); + + if (level != SOL_BLUETOOTH) + return -ENOPROTOOPT; + + lock_sock(sk); + + switch (optname) { + case BT_SECURITY: + if (sk->sk_type != SOCK_STREAM) { + err = -EINVAL; + break; + } + + sec.level = BT_SECURITY_LOW; + + len = min_t(unsigned int, sizeof(sec), optlen); + if (copy_from_user((char *) &sec, optval, len)) { + err = -EFAULT; + break; + } + + if (sec.level > BT_SECURITY_HIGH) { + err = -EINVAL; + break; + } + + rfcomm_pi(sk)->sec_level = sec.level; + break; + + case BT_DEFER_SETUP: + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { + err = -EINVAL; + break; + } + + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + if (opt) + set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); + else + clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + struct sock *l2cap_sk; + struct l2cap_conn *conn; + struct rfcomm_conninfo cinfo; + int len, err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + if (get_user(len, optlen)) + return -EFAULT; + + lock_sock(sk); + + switch (optname) { + case RFCOMM_LM: + switch (rfcomm_pi(sk)->sec_level) { + case BT_SECURITY_LOW: + opt = RFCOMM_LM_AUTH; + break; + case BT_SECURITY_MEDIUM: + opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT; + break; + case BT_SECURITY_HIGH: + opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT | + RFCOMM_LM_SECURE; + break; + case BT_SECURITY_FIPS: + opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT | + RFCOMM_LM_SECURE | RFCOMM_LM_FIPS; + break; + default: + opt = 0; + break; + } + + if (rfcomm_pi(sk)->role_switch) + opt |= RFCOMM_LM_MASTER; + + if (put_user(opt, (u32 __user *) optval)) + err = -EFAULT; + + break; + + case RFCOMM_CONNINFO: + if (sk->sk_state != BT_CONNECTED && + !rfcomm_pi(sk)->dlc->defer_setup) { + err = -ENOTCONN; + break; + } + + l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk; + conn = l2cap_pi(l2cap_sk)->chan->conn; + + memset(&cinfo, 0, sizeof(cinfo)); + cinfo.hci_handle = conn->hcon->handle; + memcpy(cinfo.dev_class, conn->hcon->dev_class, 3); + + len = min_t(unsigned int, len, sizeof(cinfo)); + if (copy_to_user(optval, (char *) &cinfo, len)) + err = -EFAULT; + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + struct bt_security sec; + int len, err = 0; + + BT_DBG("sk %p", sk); + + if (level == SOL_RFCOMM) + return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen); + + if (level != SOL_BLUETOOTH) + return -ENOPROTOOPT; + + if (get_user(len, optlen)) + return -EFAULT; + + lock_sock(sk); + + switch (optname) { + case BT_SECURITY: + if (sk->sk_type != SOCK_STREAM) { + err = -EINVAL; + break; + } + + sec.level = rfcomm_pi(sk)->sec_level; + sec.key_size = 0; + + len = min_t(unsigned int, len, sizeof(sec)); + if (copy_to_user(optval, (char *) &sec, len)) + err = -EFAULT; + + break; + + case BT_DEFER_SETUP: + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { + err = -EINVAL; + break; + } + + if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), + (u32 __user *) optval)) + err = -EFAULT; + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + struct sock *sk __maybe_unused = sock->sk; + int err; + + BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg); + + err = bt_sock_ioctl(sock, cmd, arg); + + if (err == -ENOIOCTLCMD) { +#ifdef CONFIG_BT_RFCOMM_TTY + lock_sock(sk); + err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg); + release_sock(sk); +#else + err = -EOPNOTSUPP; +#endif + } + + return err; +} + +static int rfcomm_sock_shutdown(struct socket *sock, int how) +{ + struct sock *sk = sock->sk; + int err = 0; + + BT_DBG("sock %p, sk %p", sock, sk); + + if (!sk) + return 0; + + lock_sock(sk); + if (!sk->sk_shutdown) { + sk->sk_shutdown = SHUTDOWN_MASK; + __rfcomm_sock_close(sk); + + if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime && + !(current->flags & PF_EXITING)) + err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); + } + release_sock(sk); + return err; +} + +static int rfcomm_sock_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + int err; + + BT_DBG("sock %p, sk %p", sock, sk); + + if (!sk) + return 0; + + err = rfcomm_sock_shutdown(sock, 2); + + sock_orphan(sk); + rfcomm_sock_kill(sk); + return err; +} + +/* ---- RFCOMM core layer callbacks ---- + * + * called under rfcomm_lock() + */ +int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d) +{ + struct sock *sk, *parent; + bdaddr_t src, dst; + int result = 0; + + BT_DBG("session %p channel %d", s, channel); + + rfcomm_session_getaddr(s, &src, &dst); + + /* Check if we have socket listening on channel */ + parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src); + if (!parent) + return 0; + + bh_lock_sock(parent); + + /* Check for backlog size */ + if (sk_acceptq_is_full(parent)) { + BT_DBG("backlog full %d", parent->sk_ack_backlog); + goto done; + } + + sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC); + if (!sk) + goto done; + + bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM); + + rfcomm_sock_init(sk, parent); + bacpy(&rfcomm_pi(sk)->src, &src); + bacpy(&rfcomm_pi(sk)->dst, &dst); + rfcomm_pi(sk)->channel = channel; + + sk->sk_state = BT_CONFIG; + bt_accept_enqueue(parent, sk); + + /* Accept connection and return socket DLC */ + *d = rfcomm_pi(sk)->dlc; + result = 1; + +done: + bh_unlock_sock(parent); + + if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) + parent->sk_state_change(parent); + + return result; +} + +static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p) +{ + struct sock *sk; + + read_lock(&rfcomm_sk_list.lock); + + sk_for_each(sk, &rfcomm_sk_list.head) { + seq_printf(f, "%pMR %pMR %d %d\n", + &rfcomm_pi(sk)->src, &rfcomm_pi(sk)->dst, + sk->sk_state, rfcomm_pi(sk)->channel); + } + + read_unlock(&rfcomm_sk_list.lock); + + return 0; +} + +static int rfcomm_sock_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, rfcomm_sock_debugfs_show, inode->i_private); +} + +static const struct file_operations rfcomm_sock_debugfs_fops = { + .open = rfcomm_sock_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *rfcomm_sock_debugfs; + +static const struct proto_ops rfcomm_sock_ops = { + .family = PF_BLUETOOTH, + .owner = THIS_MODULE, + .release = rfcomm_sock_release, + .bind = rfcomm_sock_bind, + .connect = rfcomm_sock_connect, + .listen = rfcomm_sock_listen, + .accept = rfcomm_sock_accept, + .getname = rfcomm_sock_getname, + .sendmsg = rfcomm_sock_sendmsg, + .recvmsg = rfcomm_sock_recvmsg, + .shutdown = rfcomm_sock_shutdown, + .setsockopt = rfcomm_sock_setsockopt, + .getsockopt = rfcomm_sock_getsockopt, + .ioctl = rfcomm_sock_ioctl, + .poll = bt_sock_poll, + .socketpair = sock_no_socketpair, + .mmap = sock_no_mmap +}; + +static const struct net_proto_family rfcomm_sock_family_ops = { + .family = PF_BLUETOOTH, + .owner = THIS_MODULE, + .create = rfcomm_sock_create +}; + +int __init rfcomm_init_sockets(void) +{ + int err; + + BUILD_BUG_ON(sizeof(struct sockaddr_rc) > sizeof(struct sockaddr)); + + err = proto_register(&rfcomm_proto, 0); + if (err < 0) + return err; + + err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops); + if (err < 0) { + BT_ERR("RFCOMM socket layer registration failed"); + goto error; + } + + err = bt_procfs_init(&init_net, "rfcomm", &rfcomm_sk_list, NULL); + if (err < 0) { + BT_ERR("Failed to create RFCOMM proc file"); + bt_sock_unregister(BTPROTO_RFCOMM); + goto error; + } + + BT_INFO("RFCOMM socket layer initialized"); + + if (IS_ERR_OR_NULL(bt_debugfs)) + return 0; + + rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444, + bt_debugfs, NULL, + &rfcomm_sock_debugfs_fops); + + return 0; + +error: + proto_unregister(&rfcomm_proto); + return err; +} + +void __exit rfcomm_cleanup_sockets(void) +{ + bt_procfs_cleanup(&init_net, "rfcomm"); + + debugfs_remove(rfcomm_sock_debugfs); + + bt_sock_unregister(BTPROTO_RFCOMM); + + proto_unregister(&rfcomm_proto); +} |