![Octavian Purdila](/assets/img/avatar_default.png)
Since bluetooth uses multiple protocols types, to avoid lockdep warnings, we need to use different lockdep classes (one for each protocol type). This is already done in bt_sock_create but it misses a couple of cases when new connections are created. This patch corrects that to fix the following warning: <4>[ 1864.732366] ======================================================= <4>[ 1864.733030] [ INFO: possible circular locking dependency detected ] <4>[ 1864.733544] 3.0.16-mid3-00007-gc9a0f62 #3 <4>[ 1864.733883] ------------------------------------------------------- <4>[ 1864.734408] t.android.btclc/4204 is trying to acquire lock: <4>[ 1864.734869] (rfcomm_mutex){+.+.+.}, at: [<c14970ea>] rfcomm_dlc_close+0x15/0x30 <4>[ 1864.735541] <4>[ 1864.735549] but task is already holding lock: <4>[ 1864.736045] (sk_lock-AF_BLUETOOTH){+.+.+.}, at: [<c1498bf7>] lock_sock+0xa/0xc <4>[ 1864.736732] <4>[ 1864.736740] which lock already depends on the new lock. <4>[ 1864.736750] <4>[ 1864.737428] <4>[ 1864.737437] the existing dependency chain (in reverse order) is: <4>[ 1864.738016] <4>[ 1864.738023] -> #1 (sk_lock-AF_BLUETOOTH){+.+.+.}: <4>[ 1864.738549] [<c1062273>] lock_acquire+0x104/0x140 <4>[ 1864.738977] [<c13d35c1>] lock_sock_nested+0x58/0x68 <4>[ 1864.739411] [<c1493c33>] l2cap_sock_sendmsg+0x3e/0x76 <4>[ 1864.739858] [<c13d06c3>] __sock_sendmsg+0x50/0x59 <4>[ 1864.740279] [<c13d0ea2>] sock_sendmsg+0x94/0xa8 <4>[ 1864.740687] [<c13d0ede>] kernel_sendmsg+0x28/0x37 <4>[ 1864.741106] [<c14969ca>] rfcomm_send_frame+0x30/0x38 <4>[ 1864.741542] [<c1496a2a>] rfcomm_send_ua+0x58/0x5a <4>[ 1864.741959] [<c1498447>] rfcomm_run+0x441/0xb52 <4>[ 1864.742365] [<c104f095>] kthread+0x63/0x68 <4>[ 1864.742742] [<c14d5182>] kernel_thread_helper+0x6/0xd <4>[ 1864.743187] <4>[ 1864.743193] -> #0 (rfcomm_mutex){+.+.+.}: <4>[ 1864.743667] [<c1061ada>] __lock_acquire+0x988/0xc00 <4>[ 1864.744100] [<c1062273>] lock_acquire+0x104/0x140 <4>[ 1864.744519] [<c14d2c70>] __mutex_lock_common+0x3b/0x33f <4>[ 1864.744975] [<c14d303e>] mutex_lock_nested+0x2d/0x36 <4>[ 1864.745412] [<c14970ea>] rfcomm_dlc_close+0x15/0x30 <4>[ 1864.745842] [<c14990d9>] __rfcomm_sock_close+0x5f/0x6b <4>[ 1864.746288] [<c1499114>] rfcomm_sock_shutdown+0x2f/0x62 <4>[ 1864.746737] [<c13d275d>] sys_socketcall+0x1db/0x422 <4>[ 1864.747165] [<c14d42f0>] syscall_call+0x7/0xb Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
1106 lines
23 KiB
C
1106 lines
23 KiB
C
/*
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BlueZ - Bluetooth protocol stack for Linux
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Copyright (C) 2000-2001 Qualcomm Incorporated
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Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
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Copyright (C) 2010 Google Inc.
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Copyright (C) 2011 ProFUSION Embedded Systems
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Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/* Bluetooth L2CAP sockets. */
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#include <linux/security.h>
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#include <linux/export.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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#include <net/bluetooth/smp.h>
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static const struct proto_ops l2cap_sock_ops;
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static void l2cap_sock_init(struct sock *sk, struct sock *parent);
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static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio);
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static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
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{
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struct sock *sk = sock->sk;
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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struct sockaddr_l2 la;
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int len, err = 0;
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BT_DBG("sk %p", sk);
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if (!addr || addr->sa_family != AF_BLUETOOTH)
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return -EINVAL;
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memset(&la, 0, sizeof(la));
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len = min_t(unsigned int, sizeof(la), alen);
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memcpy(&la, addr, len);
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if (la.l2_cid && la.l2_psm)
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return -EINVAL;
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lock_sock(sk);
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if (sk->sk_state != BT_OPEN) {
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err = -EBADFD;
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goto done;
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}
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if (la.l2_psm) {
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__u16 psm = __le16_to_cpu(la.l2_psm);
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/* PSM must be odd and lsb of upper byte must be 0 */
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if ((psm & 0x0101) != 0x0001) {
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err = -EINVAL;
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goto done;
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}
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/* Restrict usage of well-known PSMs */
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if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
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err = -EACCES;
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goto done;
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}
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}
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if (la.l2_cid)
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err = l2cap_add_scid(chan, la.l2_cid);
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else
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err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
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if (err < 0)
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goto done;
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if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
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__le16_to_cpu(la.l2_psm) == 0x0003)
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chan->sec_level = BT_SECURITY_SDP;
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bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
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chan->state = BT_BOUND;
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sk->sk_state = BT_BOUND;
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done:
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release_sock(sk);
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return err;
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}
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static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
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{
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struct sock *sk = sock->sk;
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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struct sockaddr_l2 la;
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int len, err = 0;
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BT_DBG("sk %p", sk);
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if (!addr || alen < sizeof(addr->sa_family) ||
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addr->sa_family != AF_BLUETOOTH)
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return -EINVAL;
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memset(&la, 0, sizeof(la));
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len = min_t(unsigned int, sizeof(la), alen);
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memcpy(&la, addr, len);
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if (la.l2_cid && la.l2_psm)
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return -EINVAL;
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err = l2cap_chan_connect(chan, la.l2_psm, la.l2_cid, &la.l2_bdaddr);
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if (err)
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goto done;
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err = bt_sock_wait_state(sk, BT_CONNECTED,
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sock_sndtimeo(sk, flags & O_NONBLOCK));
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done:
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if (sock_owned_by_user(sk))
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release_sock(sk);
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return err;
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}
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static int l2cap_sock_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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int err = 0;
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BT_DBG("sk %p backlog %d", sk, backlog);
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lock_sock(sk);
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if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
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|| sk->sk_state != BT_BOUND) {
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err = -EBADFD;
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goto done;
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}
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switch (chan->mode) {
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case L2CAP_MODE_BASIC:
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break;
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case L2CAP_MODE_ERTM:
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case L2CAP_MODE_STREAMING:
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if (!disable_ertm)
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break;
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/* fall through */
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default:
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err = -ENOTSUPP;
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goto done;
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}
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sk->sk_max_ack_backlog = backlog;
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sk->sk_ack_backlog = 0;
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chan->state = BT_LISTEN;
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sk->sk_state = BT_LISTEN;
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done:
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release_sock(sk);
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return err;
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}
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static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
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{
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DECLARE_WAITQUEUE(wait, current);
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struct sock *sk = sock->sk, *nsk;
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long timeo;
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int err = 0;
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
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BT_DBG("sk %p timeo %ld", sk, timeo);
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/* Wait for an incoming connection. (wake-one). */
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add_wait_queue_exclusive(sk_sleep(sk), &wait);
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while (1) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (sk->sk_state != BT_LISTEN) {
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err = -EBADFD;
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break;
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}
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nsk = bt_accept_dequeue(sk, newsock);
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if (nsk)
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break;
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if (!timeo) {
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err = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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err = sock_intr_errno(timeo);
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break;
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}
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release_sock(sk);
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timeo = schedule_timeout(timeo);
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lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
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}
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(sk_sleep(sk), &wait);
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if (err)
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goto done;
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newsock->state = SS_CONNECTED;
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BT_DBG("new socket %p", nsk);
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done:
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release_sock(sk);
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return err;
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}
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static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
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{
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struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
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struct sock *sk = sock->sk;
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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BT_DBG("sock %p, sk %p", sock, sk);
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addr->sa_family = AF_BLUETOOTH;
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*len = sizeof(struct sockaddr_l2);
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if (peer) {
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la->l2_psm = chan->psm;
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bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
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la->l2_cid = cpu_to_le16(chan->dcid);
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} else {
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la->l2_psm = chan->sport;
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bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
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la->l2_cid = cpu_to_le16(chan->scid);
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}
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return 0;
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}
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static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
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{
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struct sock *sk = sock->sk;
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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struct l2cap_options opts;
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struct l2cap_conninfo cinfo;
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int len, err = 0;
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u32 opt;
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BT_DBG("sk %p", sk);
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if (get_user(len, optlen))
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return -EFAULT;
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lock_sock(sk);
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switch (optname) {
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case L2CAP_OPTIONS:
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memset(&opts, 0, sizeof(opts));
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opts.imtu = chan->imtu;
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opts.omtu = chan->omtu;
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opts.flush_to = chan->flush_to;
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opts.mode = chan->mode;
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opts.fcs = chan->fcs;
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opts.max_tx = chan->max_tx;
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opts.txwin_size = chan->tx_win;
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len = min_t(unsigned int, len, sizeof(opts));
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if (copy_to_user(optval, (char *) &opts, len))
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err = -EFAULT;
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break;
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case L2CAP_LM:
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switch (chan->sec_level) {
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case BT_SECURITY_LOW:
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opt = L2CAP_LM_AUTH;
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break;
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case BT_SECURITY_MEDIUM:
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opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
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break;
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case BT_SECURITY_HIGH:
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opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
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L2CAP_LM_SECURE;
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break;
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default:
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opt = 0;
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break;
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}
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if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
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opt |= L2CAP_LM_MASTER;
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if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
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opt |= L2CAP_LM_RELIABLE;
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if (put_user(opt, (u32 __user *) optval))
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err = -EFAULT;
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break;
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case L2CAP_CONNINFO:
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if (sk->sk_state != BT_CONNECTED &&
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!(sk->sk_state == BT_CONNECT2 &&
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bt_sk(sk)->defer_setup)) {
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err = -ENOTCONN;
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break;
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}
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memset(&cinfo, 0, sizeof(cinfo));
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cinfo.hci_handle = chan->conn->hcon->handle;
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memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
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len = min_t(unsigned int, len, sizeof(cinfo));
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if (copy_to_user(optval, (char *) &cinfo, len))
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err = -EFAULT;
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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}
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release_sock(sk);
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return err;
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}
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static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
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{
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struct sock *sk = sock->sk;
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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struct bt_security sec;
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struct bt_power pwr;
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int len, err = 0;
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BT_DBG("sk %p", sk);
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if (level == SOL_L2CAP)
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return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
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if (level != SOL_BLUETOOTH)
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return -ENOPROTOOPT;
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if (get_user(len, optlen))
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return -EFAULT;
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lock_sock(sk);
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switch (optname) {
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case BT_SECURITY:
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if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
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chan->chan_type != L2CAP_CHAN_RAW) {
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err = -EINVAL;
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break;
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}
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memset(&sec, 0, sizeof(sec));
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sec.level = chan->sec_level;
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if (sk->sk_state == BT_CONNECTED)
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sec.key_size = chan->conn->hcon->enc_key_size;
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len = min_t(unsigned int, len, sizeof(sec));
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if (copy_to_user(optval, (char *) &sec, len))
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err = -EFAULT;
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break;
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case BT_DEFER_SETUP:
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if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
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err = -EINVAL;
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break;
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}
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if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
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err = -EFAULT;
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break;
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case BT_FLUSHABLE:
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if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
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(u32 __user *) optval))
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err = -EFAULT;
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break;
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case BT_POWER:
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if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
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&& sk->sk_type != SOCK_RAW) {
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err = -EINVAL;
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break;
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}
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pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
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len = min_t(unsigned int, len, sizeof(pwr));
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if (copy_to_user(optval, (char *) &pwr, len))
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err = -EFAULT;
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break;
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case BT_CHANNEL_POLICY:
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if (!enable_hs) {
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err = -ENOPROTOOPT;
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break;
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}
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if (put_user(chan->chan_policy, (u32 __user *) optval))
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err = -EFAULT;
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break;
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default:
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err = -ENOPROTOOPT;
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break;
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}
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release_sock(sk);
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return err;
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}
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|
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static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
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{
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struct sock *sk = sock->sk;
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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struct l2cap_options opts;
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int len, err = 0;
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u32 opt;
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BT_DBG("sk %p", sk);
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lock_sock(sk);
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|
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switch (optname) {
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case L2CAP_OPTIONS:
|
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if (sk->sk_state == BT_CONNECTED) {
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err = -EINVAL;
|
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break;
|
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}
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opts.imtu = chan->imtu;
|
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opts.omtu = chan->omtu;
|
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opts.flush_to = chan->flush_to;
|
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opts.mode = chan->mode;
|
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opts.fcs = chan->fcs;
|
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opts.max_tx = chan->max_tx;
|
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opts.txwin_size = chan->tx_win;
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|
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len = min_t(unsigned int, sizeof(opts), optlen);
|
|
if (copy_from_user((char *) &opts, optval, len)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
chan->mode = opts.mode;
|
|
switch (chan->mode) {
|
|
case L2CAP_MODE_BASIC:
|
|
clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
|
|
break;
|
|
case L2CAP_MODE_ERTM:
|
|
case L2CAP_MODE_STREAMING:
|
|
if (!disable_ertm)
|
|
break;
|
|
/* fall through */
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
chan->imtu = opts.imtu;
|
|
chan->omtu = opts.omtu;
|
|
chan->fcs = opts.fcs;
|
|
chan->max_tx = opts.max_tx;
|
|
chan->tx_win = opts.txwin_size;
|
|
break;
|
|
|
|
case L2CAP_LM:
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt & L2CAP_LM_AUTH)
|
|
chan->sec_level = BT_SECURITY_LOW;
|
|
if (opt & L2CAP_LM_ENCRYPT)
|
|
chan->sec_level = BT_SECURITY_MEDIUM;
|
|
if (opt & L2CAP_LM_SECURE)
|
|
chan->sec_level = BT_SECURITY_HIGH;
|
|
|
|
if (opt & L2CAP_LM_MASTER)
|
|
set_bit(FLAG_ROLE_SWITCH, &chan->flags);
|
|
else
|
|
clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
|
|
|
|
if (opt & L2CAP_LM_RELIABLE)
|
|
set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
|
|
else
|
|
clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
|
|
struct bt_security sec;
|
|
struct bt_power pwr;
|
|
struct l2cap_conn *conn;
|
|
int len, err = 0;
|
|
u32 opt;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (level == SOL_L2CAP)
|
|
return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
|
|
|
|
if (level != SOL_BLUETOOTH)
|
|
return -ENOPROTOOPT;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case BT_SECURITY:
|
|
if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
|
|
chan->chan_type != L2CAP_CHAN_RAW) {
|
|
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_LOW ||
|
|
sec.level > BT_SECURITY_HIGH) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
chan->sec_level = sec.level;
|
|
|
|
if (!chan->conn)
|
|
break;
|
|
|
|
conn = chan->conn;
|
|
|
|
/*change security for LE channels */
|
|
if (chan->scid == L2CAP_CID_LE_DATA) {
|
|
if (!conn->hcon->out) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (smp_conn_security(conn, sec.level))
|
|
break;
|
|
sk->sk_state = BT_CONFIG;
|
|
chan->state = BT_CONFIG;
|
|
|
|
/* or for ACL link, under defer_setup time */
|
|
} else if (sk->sk_state == BT_CONNECT2 &&
|
|
bt_sk(sk)->defer_setup) {
|
|
err = l2cap_chan_check_security(chan);
|
|
} else {
|
|
err = -EINVAL;
|
|
}
|
|
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;
|
|
}
|
|
|
|
bt_sk(sk)->defer_setup = opt;
|
|
break;
|
|
|
|
case BT_FLUSHABLE:
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt > BT_FLUSHABLE_ON) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (opt == BT_FLUSHABLE_OFF) {
|
|
struct l2cap_conn *conn = chan->conn;
|
|
/* proceed further only when we have l2cap_conn and
|
|
No Flush support in the LM */
|
|
if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (opt)
|
|
set_bit(FLAG_FLUSHABLE, &chan->flags);
|
|
else
|
|
clear_bit(FLAG_FLUSHABLE, &chan->flags);
|
|
break;
|
|
|
|
case BT_POWER:
|
|
if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
|
|
chan->chan_type != L2CAP_CHAN_RAW) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
|
|
|
|
len = min_t(unsigned int, sizeof(pwr), optlen);
|
|
if (copy_from_user((char *) &pwr, optval, len)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (pwr.force_active)
|
|
set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
|
|
else
|
|
clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
|
|
break;
|
|
|
|
case BT_CHANNEL_POLICY:
|
|
if (!enable_hs) {
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
if (get_user(opt, (u32 __user *) optval)) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (chan->mode != L2CAP_MODE_ERTM &&
|
|
chan->mode != L2CAP_MODE_STREAMING) {
|
|
err = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
chan->chan_policy = (u8) opt;
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
|
|
int err;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state != BT_CONNECTED) {
|
|
release_sock(sk);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
err = l2cap_chan_send(chan, msg, len, sk->sk_priority);
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
int err;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
|
|
sk->sk_state = BT_CONFIG;
|
|
pi->chan->state = BT_CONFIG;
|
|
|
|
__l2cap_connect_rsp_defer(pi->chan);
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
if (sock->type == SOCK_STREAM)
|
|
err = bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
|
|
else
|
|
err = bt_sock_recvmsg(iocb, sock, msg, len, flags);
|
|
|
|
if (pi->chan->mode != L2CAP_MODE_ERTM)
|
|
return err;
|
|
|
|
/* Attempt to put pending rx data in the socket buffer */
|
|
|
|
lock_sock(sk);
|
|
|
|
if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
|
|
goto done;
|
|
|
|
if (pi->rx_busy_skb) {
|
|
if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
|
|
pi->rx_busy_skb = NULL;
|
|
else
|
|
goto done;
|
|
}
|
|
|
|
/* Restore data flow when half of the receive buffer is
|
|
* available. This avoids resending large numbers of
|
|
* frames.
|
|
*/
|
|
if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
|
|
l2cap_chan_busy(pi->chan, 0);
|
|
|
|
done:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
/* Kill socket (only if zapped and orphan)
|
|
* Must be called on unlocked socket.
|
|
*/
|
|
static void l2cap_sock_kill(struct sock *sk)
|
|
{
|
|
if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
|
|
return;
|
|
|
|
BT_DBG("sk %p state %d", sk, sk->sk_state);
|
|
|
|
/* Kill poor orphan */
|
|
|
|
l2cap_chan_destroy(l2cap_pi(sk)->chan);
|
|
sock_set_flag(sk, SOCK_DEAD);
|
|
sock_put(sk);
|
|
}
|
|
|
|
static int l2cap_sock_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
|
|
int err = 0;
|
|
|
|
BT_DBG("sock %p, sk %p", sock, sk);
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
lock_sock(sk);
|
|
if (!sk->sk_shutdown) {
|
|
if (chan->mode == L2CAP_MODE_ERTM)
|
|
err = __l2cap_wait_ack(sk);
|
|
|
|
sk->sk_shutdown = SHUTDOWN_MASK;
|
|
l2cap_chan_close(chan, 0);
|
|
|
|
if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
|
|
err = bt_sock_wait_state(sk, BT_CLOSED,
|
|
sk->sk_lingertime);
|
|
}
|
|
|
|
if (!err && sk->sk_err)
|
|
err = -sk->sk_err;
|
|
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int l2cap_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 = l2cap_sock_shutdown(sock, 2);
|
|
|
|
sock_orphan(sk);
|
|
l2cap_sock_kill(sk);
|
|
return err;
|
|
}
|
|
|
|
static struct l2cap_chan *l2cap_sock_new_connection_cb(void *data)
|
|
{
|
|
struct sock *sk, *parent = data;
|
|
|
|
sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
|
|
GFP_ATOMIC);
|
|
if (!sk)
|
|
return NULL;
|
|
|
|
bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
|
|
|
|
l2cap_sock_init(sk, parent);
|
|
|
|
return l2cap_pi(sk)->chan;
|
|
}
|
|
|
|
static int l2cap_sock_recv_cb(void *data, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
struct sock *sk = data;
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
|
|
if (pi->rx_busy_skb)
|
|
return -ENOMEM;
|
|
|
|
err = sock_queue_rcv_skb(sk, skb);
|
|
|
|
/* For ERTM, handle one skb that doesn't fit into the recv
|
|
* buffer. This is important to do because the data frames
|
|
* have already been acked, so the skb cannot be discarded.
|
|
*
|
|
* Notify the l2cap core that the buffer is full, so the
|
|
* LOCAL_BUSY state is entered and no more frames are
|
|
* acked and reassembled until there is buffer space
|
|
* available.
|
|
*/
|
|
if (err < 0 && pi->chan->mode == L2CAP_MODE_ERTM) {
|
|
pi->rx_busy_skb = skb;
|
|
l2cap_chan_busy(pi->chan, 1);
|
|
err = 0;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void l2cap_sock_close_cb(void *data)
|
|
{
|
|
struct sock *sk = data;
|
|
|
|
l2cap_sock_kill(sk);
|
|
}
|
|
|
|
static void l2cap_sock_state_change_cb(void *data, int state)
|
|
{
|
|
struct sock *sk = data;
|
|
|
|
sk->sk_state = state;
|
|
}
|
|
|
|
static struct l2cap_ops l2cap_chan_ops = {
|
|
.name = "L2CAP Socket Interface",
|
|
.new_connection = l2cap_sock_new_connection_cb,
|
|
.recv = l2cap_sock_recv_cb,
|
|
.close = l2cap_sock_close_cb,
|
|
.state_change = l2cap_sock_state_change_cb,
|
|
};
|
|
|
|
static void l2cap_sock_destruct(struct sock *sk)
|
|
{
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (l2cap_pi(sk)->rx_busy_skb) {
|
|
kfree_skb(l2cap_pi(sk)->rx_busy_skb);
|
|
l2cap_pi(sk)->rx_busy_skb = NULL;
|
|
}
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
skb_queue_purge(&sk->sk_write_queue);
|
|
}
|
|
|
|
static void l2cap_sock_init(struct sock *sk, struct sock *parent)
|
|
{
|
|
struct l2cap_pinfo *pi = l2cap_pi(sk);
|
|
struct l2cap_chan *chan = pi->chan;
|
|
|
|
BT_DBG("sk %p", sk);
|
|
|
|
if (parent) {
|
|
struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
|
|
|
|
sk->sk_type = parent->sk_type;
|
|
bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
|
|
|
|
chan->chan_type = pchan->chan_type;
|
|
chan->imtu = pchan->imtu;
|
|
chan->omtu = pchan->omtu;
|
|
chan->conf_state = pchan->conf_state;
|
|
chan->mode = pchan->mode;
|
|
chan->fcs = pchan->fcs;
|
|
chan->max_tx = pchan->max_tx;
|
|
chan->tx_win = pchan->tx_win;
|
|
chan->tx_win_max = pchan->tx_win_max;
|
|
chan->sec_level = pchan->sec_level;
|
|
chan->flags = pchan->flags;
|
|
|
|
security_sk_clone(parent, sk);
|
|
} else {
|
|
|
|
switch (sk->sk_type) {
|
|
case SOCK_RAW:
|
|
chan->chan_type = L2CAP_CHAN_RAW;
|
|
break;
|
|
case SOCK_DGRAM:
|
|
chan->chan_type = L2CAP_CHAN_CONN_LESS;
|
|
break;
|
|
case SOCK_SEQPACKET:
|
|
case SOCK_STREAM:
|
|
chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
|
|
break;
|
|
}
|
|
|
|
chan->imtu = L2CAP_DEFAULT_MTU;
|
|
chan->omtu = 0;
|
|
if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
|
|
chan->mode = L2CAP_MODE_ERTM;
|
|
set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
|
|
} else {
|
|
chan->mode = L2CAP_MODE_BASIC;
|
|
}
|
|
chan->max_tx = L2CAP_DEFAULT_MAX_TX;
|
|
chan->fcs = L2CAP_FCS_CRC16;
|
|
chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
|
|
chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
|
|
chan->sec_level = BT_SECURITY_LOW;
|
|
chan->flags = 0;
|
|
set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
|
|
}
|
|
|
|
/* Default config options */
|
|
chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
|
|
|
|
chan->data = sk;
|
|
chan->ops = &l2cap_chan_ops;
|
|
}
|
|
|
|
static struct proto l2cap_proto = {
|
|
.name = "L2CAP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct l2cap_pinfo)
|
|
};
|
|
|
|
static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
|
|
{
|
|
struct sock *sk;
|
|
struct l2cap_chan *chan;
|
|
|
|
sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
|
|
if (!sk)
|
|
return NULL;
|
|
|
|
sock_init_data(sock, sk);
|
|
INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
|
|
|
|
sk->sk_destruct = l2cap_sock_destruct;
|
|
sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
|
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
|
|
sk->sk_protocol = proto;
|
|
sk->sk_state = BT_OPEN;
|
|
|
|
chan = l2cap_chan_create(sk);
|
|
if (!chan) {
|
|
l2cap_sock_kill(sk);
|
|
return NULL;
|
|
}
|
|
|
|
l2cap_pi(sk)->chan = chan;
|
|
|
|
return sk;
|
|
}
|
|
|
|
static int l2cap_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_SEQPACKET && sock->type != SOCK_STREAM &&
|
|
sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
|
|
return -EPERM;
|
|
|
|
sock->ops = &l2cap_sock_ops;
|
|
|
|
sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
|
|
if (!sk)
|
|
return -ENOMEM;
|
|
|
|
l2cap_sock_init(sk, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static const struct proto_ops l2cap_sock_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.release = l2cap_sock_release,
|
|
.bind = l2cap_sock_bind,
|
|
.connect = l2cap_sock_connect,
|
|
.listen = l2cap_sock_listen,
|
|
.accept = l2cap_sock_accept,
|
|
.getname = l2cap_sock_getname,
|
|
.sendmsg = l2cap_sock_sendmsg,
|
|
.recvmsg = l2cap_sock_recvmsg,
|
|
.poll = bt_sock_poll,
|
|
.ioctl = bt_sock_ioctl,
|
|
.mmap = sock_no_mmap,
|
|
.socketpair = sock_no_socketpair,
|
|
.shutdown = l2cap_sock_shutdown,
|
|
.setsockopt = l2cap_sock_setsockopt,
|
|
.getsockopt = l2cap_sock_getsockopt
|
|
};
|
|
|
|
static const struct net_proto_family l2cap_sock_family_ops = {
|
|
.family = PF_BLUETOOTH,
|
|
.owner = THIS_MODULE,
|
|
.create = l2cap_sock_create,
|
|
};
|
|
|
|
int __init l2cap_init_sockets(void)
|
|
{
|
|
int err;
|
|
|
|
err = proto_register(&l2cap_proto, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
BT_INFO("L2CAP socket layer initialized");
|
|
|
|
return 0;
|
|
|
|
error:
|
|
BT_ERR("L2CAP socket registration failed");
|
|
proto_unregister(&l2cap_proto);
|
|
return err;
|
|
}
|
|
|
|
void l2cap_cleanup_sockets(void)
|
|
{
|
|
if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
|
|
BT_ERR("L2CAP socket unregistration failed");
|
|
|
|
proto_unregister(&l2cap_proto);
|
|
}
|