2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
6 Copyright (C) 2011 ProFUSION Embedded Systems
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
28 /* Bluetooth L2CAP sockets. */
30 #include <linux/module.h>
31 #include <linux/export.h>
33 #include <net/bluetooth/bluetooth.h>
34 #include <net/bluetooth/hci_core.h>
35 #include <net/bluetooth/l2cap.h>
39 static struct bt_sock_list l2cap_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
43 static const struct proto_ops l2cap_sock_ops;
44 static void l2cap_sock_init(struct sock *sk, struct sock *parent);
45 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
46 int proto, gfp_t prio);
48 bool l2cap_is_socket(struct socket *sock)
50 return sock && sock->ops == &l2cap_sock_ops;
52 EXPORT_SYMBOL(l2cap_is_socket);
54 static int l2cap_validate_bredr_psm(u16 psm)
56 /* PSM must be odd and lsb of upper byte must be 0 */
57 if ((psm & 0x0101) != 0x0001)
60 /* Restrict usage of well-known PSMs */
61 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE))
67 static int l2cap_validate_le_psm(u16 psm)
69 /* Valid LE_PSM ranges are defined only until 0x00ff */
73 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
74 if (psm <= 0x007f && !capable(CAP_NET_BIND_SERVICE))
80 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
82 struct sock *sk = sock->sk;
83 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
84 struct sockaddr_l2 la;
89 if (!addr || addr->sa_family != AF_BLUETOOTH)
92 memset(&la, 0, sizeof(la));
93 len = min_t(unsigned int, sizeof(la), alen);
94 memcpy(&la, addr, len);
96 if (la.l2_cid && la.l2_psm)
99 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
103 /* When the socket gets created it defaults to
104 * CHAN_CONN_ORIENTED, so we need to overwrite the
107 chan->chan_type = L2CAP_CHAN_FIXED;
108 chan->omtu = L2CAP_DEFAULT_MTU;
111 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
112 /* We only allow ATT user space socket */
114 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
120 if (sk->sk_state != BT_OPEN) {
126 __u16 psm = __le16_to_cpu(la.l2_psm);
128 if (la.l2_bdaddr_type == BDADDR_BREDR)
129 err = l2cap_validate_bredr_psm(psm);
131 err = l2cap_validate_le_psm(psm);
138 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
140 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
145 switch (chan->chan_type) {
146 case L2CAP_CHAN_CONN_LESS:
147 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
148 chan->sec_level = BT_SECURITY_SDP;
150 case L2CAP_CHAN_CONN_ORIENTED:
151 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
152 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
153 chan->sec_level = BT_SECURITY_SDP;
156 chan->sec_level = BT_SECURITY_SDP;
160 bacpy(&chan->src, &la.l2_bdaddr);
161 chan->src_type = la.l2_bdaddr_type;
163 if (chan->psm && bdaddr_type_is_le(chan->src_type))
164 chan->mode = L2CAP_MODE_LE_FLOWCTL;
166 chan->state = BT_BOUND;
167 sk->sk_state = BT_BOUND;
174 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
177 struct sock *sk = sock->sk;
178 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
179 struct sockaddr_l2 la;
184 if (!addr || alen < sizeof(addr->sa_family) ||
185 addr->sa_family != AF_BLUETOOTH)
188 memset(&la, 0, sizeof(la));
189 len = min_t(unsigned int, sizeof(la), alen);
190 memcpy(&la, addr, len);
192 if (la.l2_cid && la.l2_psm)
195 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
198 /* Check that the socket wasn't bound to something that
199 * conflicts with the address given to connect(). If chan->src
200 * is BDADDR_ANY it means bind() was never used, in which case
201 * chan->src_type and la.l2_bdaddr_type do not need to match.
203 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
204 bdaddr_type_is_le(la.l2_bdaddr_type)) {
205 /* Old user space versions will try to incorrectly bind
206 * the ATT socket using BDADDR_BREDR. We need to accept
207 * this and fix up the source address type only when
208 * both the source CID and destination CID indicate
209 * ATT. Anything else is an invalid combination.
211 if (chan->scid != L2CAP_CID_ATT ||
212 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
215 /* We don't have the hdev available here to make a
216 * better decision on random vs public, but since all
217 * user space versions that exhibit this issue anyway do
218 * not support random local addresses assuming public
219 * here is good enough.
221 chan->src_type = BDADDR_LE_PUBLIC;
224 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
227 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
228 /* We only allow ATT user space socket */
230 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
234 if (chan->psm && bdaddr_type_is_le(chan->src_type))
235 chan->mode = L2CAP_MODE_LE_FLOWCTL;
237 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
238 &la.l2_bdaddr, la.l2_bdaddr_type);
244 err = bt_sock_wait_state(sk, BT_CONNECTED,
245 sock_sndtimeo(sk, flags & O_NONBLOCK));
252 static int l2cap_sock_listen(struct socket *sock, int backlog)
254 struct sock *sk = sock->sk;
255 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
258 BT_DBG("sk %p backlog %d", sk, backlog);
262 if (sk->sk_state != BT_BOUND) {
267 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
272 switch (chan->mode) {
273 case L2CAP_MODE_BASIC:
274 case L2CAP_MODE_LE_FLOWCTL:
276 case L2CAP_MODE_ERTM:
277 case L2CAP_MODE_STREAMING:
286 sk->sk_max_ack_backlog = backlog;
287 sk->sk_ack_backlog = 0;
289 chan->state = BT_LISTEN;
290 sk->sk_state = BT_LISTEN;
297 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
300 DECLARE_WAITQUEUE(wait, current);
301 struct sock *sk = sock->sk, *nsk;
305 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
307 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
309 BT_DBG("sk %p timeo %ld", sk, timeo);
311 /* Wait for an incoming connection. (wake-one). */
312 add_wait_queue_exclusive(sk_sleep(sk), &wait);
314 set_current_state(TASK_INTERRUPTIBLE);
316 if (sk->sk_state != BT_LISTEN) {
321 nsk = bt_accept_dequeue(sk, newsock);
330 if (signal_pending(current)) {
331 err = sock_intr_errno(timeo);
336 timeo = schedule_timeout(timeo);
337 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
339 __set_current_state(TASK_RUNNING);
340 remove_wait_queue(sk_sleep(sk), &wait);
345 newsock->state = SS_CONNECTED;
347 BT_DBG("new socket %p", nsk);
354 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
357 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
358 struct sock *sk = sock->sk;
359 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
361 BT_DBG("sock %p, sk %p", sock, sk);
363 if (peer && sk->sk_state != BT_CONNECTED &&
364 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2)
367 memset(la, 0, sizeof(struct sockaddr_l2));
368 addr->sa_family = AF_BLUETOOTH;
369 *len = sizeof(struct sockaddr_l2);
371 la->l2_psm = chan->psm;
374 bacpy(&la->l2_bdaddr, &chan->dst);
375 la->l2_cid = cpu_to_le16(chan->dcid);
376 la->l2_bdaddr_type = chan->dst_type;
378 bacpy(&la->l2_bdaddr, &chan->src);
379 la->l2_cid = cpu_to_le16(chan->scid);
380 la->l2_bdaddr_type = chan->src_type;
386 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
387 char __user *optval, int __user *optlen)
389 struct sock *sk = sock->sk;
390 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
391 struct l2cap_options opts;
392 struct l2cap_conninfo cinfo;
398 if (get_user(len, optlen))
405 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
406 * legacy ATT code depends on getsockopt for
407 * L2CAP_OPTIONS we need to let this pass.
409 if (bdaddr_type_is_le(chan->src_type) &&
410 chan->scid != L2CAP_CID_ATT) {
415 memset(&opts, 0, sizeof(opts));
416 opts.imtu = chan->imtu;
417 opts.omtu = chan->omtu;
418 opts.flush_to = chan->flush_to;
419 opts.mode = chan->mode;
420 opts.fcs = chan->fcs;
421 opts.max_tx = chan->max_tx;
422 opts.txwin_size = chan->tx_win;
424 len = min_t(unsigned int, len, sizeof(opts));
425 if (copy_to_user(optval, (char *) &opts, len))
431 switch (chan->sec_level) {
432 case BT_SECURITY_LOW:
435 case BT_SECURITY_MEDIUM:
436 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
438 case BT_SECURITY_HIGH:
439 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
442 case BT_SECURITY_FIPS:
443 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
444 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
451 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
452 opt |= L2CAP_LM_MASTER;
454 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
455 opt |= L2CAP_LM_RELIABLE;
457 if (put_user(opt, (u32 __user *) optval))
463 if (sk->sk_state != BT_CONNECTED &&
464 !(sk->sk_state == BT_CONNECT2 &&
465 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
470 memset(&cinfo, 0, sizeof(cinfo));
471 cinfo.hci_handle = chan->conn->hcon->handle;
472 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
474 len = min_t(unsigned int, len, sizeof(cinfo));
475 if (copy_to_user(optval, (char *) &cinfo, len))
489 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
490 char __user *optval, int __user *optlen)
492 struct sock *sk = sock->sk;
493 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
494 struct bt_security sec;
500 if (level == SOL_L2CAP)
501 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
503 if (level != SOL_BLUETOOTH)
506 if (get_user(len, optlen))
513 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
514 chan->chan_type != L2CAP_CHAN_FIXED &&
515 chan->chan_type != L2CAP_CHAN_RAW) {
520 memset(&sec, 0, sizeof(sec));
522 sec.level = chan->conn->hcon->sec_level;
524 if (sk->sk_state == BT_CONNECTED)
525 sec.key_size = chan->conn->hcon->enc_key_size;
527 sec.level = chan->sec_level;
530 len = min_t(unsigned int, len, sizeof(sec));
531 if (copy_to_user(optval, (char *) &sec, len))
537 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
542 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
543 (u32 __user *) optval))
549 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
550 (u32 __user *) optval))
556 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
557 && sk->sk_type != SOCK_RAW) {
562 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
564 len = min_t(unsigned int, len, sizeof(pwr));
565 if (copy_to_user(optval, (char *) &pwr, len))
570 case BT_CHANNEL_POLICY:
571 if (put_user(chan->chan_policy, (u32 __user *) optval))
576 if (!bdaddr_type_is_le(chan->src_type)) {
581 if (sk->sk_state != BT_CONNECTED) {
586 if (put_user(chan->omtu, (u16 __user *) optval))
591 if (!bdaddr_type_is_le(chan->src_type)) {
596 if (put_user(chan->imtu, (u16 __user *) optval))
609 static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
611 switch (chan->scid) {
613 if (mtu < L2CAP_LE_MIN_MTU)
618 if (mtu < L2CAP_DEFAULT_MIN_MTU)
625 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
626 char __user *optval, unsigned int optlen)
628 struct sock *sk = sock->sk;
629 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
630 struct l2cap_options opts;
640 if (bdaddr_type_is_le(chan->src_type)) {
645 if (sk->sk_state == BT_CONNECTED) {
650 opts.imtu = chan->imtu;
651 opts.omtu = chan->omtu;
652 opts.flush_to = chan->flush_to;
653 opts.mode = chan->mode;
654 opts.fcs = chan->fcs;
655 opts.max_tx = chan->max_tx;
656 opts.txwin_size = chan->tx_win;
658 len = min_t(unsigned int, sizeof(opts), optlen);
659 if (copy_from_user((char *) &opts, optval, len)) {
664 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
669 if (!l2cap_valid_mtu(chan, opts.imtu)) {
674 chan->mode = opts.mode;
675 switch (chan->mode) {
676 case L2CAP_MODE_LE_FLOWCTL:
678 case L2CAP_MODE_BASIC:
679 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
681 case L2CAP_MODE_ERTM:
682 case L2CAP_MODE_STREAMING:
691 chan->imtu = opts.imtu;
692 chan->omtu = opts.omtu;
693 chan->fcs = opts.fcs;
694 chan->max_tx = opts.max_tx;
695 chan->tx_win = opts.txwin_size;
696 chan->flush_to = opts.flush_to;
700 if (get_user(opt, (u32 __user *) optval)) {
705 if (opt & L2CAP_LM_FIPS) {
710 if (opt & L2CAP_LM_AUTH)
711 chan->sec_level = BT_SECURITY_LOW;
712 if (opt & L2CAP_LM_ENCRYPT)
713 chan->sec_level = BT_SECURITY_MEDIUM;
714 if (opt & L2CAP_LM_SECURE)
715 chan->sec_level = BT_SECURITY_HIGH;
717 if (opt & L2CAP_LM_MASTER)
718 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
720 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
722 if (opt & L2CAP_LM_RELIABLE)
723 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
725 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
737 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
738 char __user *optval, unsigned int optlen)
740 struct sock *sk = sock->sk;
741 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
742 struct bt_security sec;
744 struct l2cap_conn *conn;
750 if (level == SOL_L2CAP)
751 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
753 if (level != SOL_BLUETOOTH)
760 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
761 chan->chan_type != L2CAP_CHAN_FIXED &&
762 chan->chan_type != L2CAP_CHAN_RAW) {
767 sec.level = BT_SECURITY_LOW;
769 len = min_t(unsigned int, sizeof(sec), optlen);
770 if (copy_from_user((char *) &sec, optval, len)) {
775 if (sec.level < BT_SECURITY_LOW ||
776 sec.level > BT_SECURITY_HIGH) {
781 chan->sec_level = sec.level;
788 /*change security for LE channels */
789 if (chan->scid == L2CAP_CID_ATT) {
790 if (!conn->hcon->out) {
795 if (smp_conn_security(conn->hcon, sec.level))
797 sk->sk_state = BT_CONFIG;
798 chan->state = BT_CONFIG;
800 /* or for ACL link */
801 } else if ((sk->sk_state == BT_CONNECT2 &&
802 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
803 sk->sk_state == BT_CONNECTED) {
804 if (!l2cap_chan_check_security(chan))
805 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
807 sk->sk_state_change(sk);
814 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
819 if (get_user(opt, (u32 __user *) optval)) {
825 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
826 set_bit(FLAG_DEFER_SETUP, &chan->flags);
828 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
829 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
834 if (get_user(opt, (u32 __user *) optval)) {
839 if (opt > BT_FLUSHABLE_ON) {
844 if (opt == BT_FLUSHABLE_OFF) {
846 /* proceed further only when we have l2cap_conn and
847 No Flush support in the LM */
848 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
855 set_bit(FLAG_FLUSHABLE, &chan->flags);
857 clear_bit(FLAG_FLUSHABLE, &chan->flags);
861 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
862 chan->chan_type != L2CAP_CHAN_RAW) {
867 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
869 len = min_t(unsigned int, sizeof(pwr), optlen);
870 if (copy_from_user((char *) &pwr, optval, len)) {
875 if (pwr.force_active)
876 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
878 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
881 case BT_CHANNEL_POLICY:
882 if (get_user(opt, (u32 __user *) optval)) {
887 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
892 if (chan->mode != L2CAP_MODE_ERTM &&
893 chan->mode != L2CAP_MODE_STREAMING) {
898 chan->chan_policy = (u8) opt;
900 if (sk->sk_state == BT_CONNECTED &&
901 chan->move_role == L2CAP_MOVE_ROLE_NONE)
902 l2cap_move_start(chan);
907 if (!bdaddr_type_is_le(chan->src_type)) {
912 /* Setting is not supported as it's the remote side that
919 if (!bdaddr_type_is_le(chan->src_type)) {
924 if (sk->sk_state == BT_CONNECTED) {
929 if (get_user(opt, (u32 __user *) optval)) {
946 static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
947 struct msghdr *msg, size_t len)
949 struct sock *sk = sock->sk;
950 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
953 BT_DBG("sock %p, sk %p", sock, sk);
955 err = sock_error(sk);
959 if (msg->msg_flags & MSG_OOB)
962 if (sk->sk_state != BT_CONNECTED)
966 err = bt_sock_wait_ready(sk, msg->msg_flags);
971 l2cap_chan_lock(chan);
972 err = l2cap_chan_send(chan, msg, len, sk->sk_priority);
973 l2cap_chan_unlock(chan);
978 static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
979 struct msghdr *msg, size_t len, int flags)
981 struct sock *sk = sock->sk;
982 struct l2cap_pinfo *pi = l2cap_pi(sk);
987 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
988 &bt_sk(sk)->flags)) {
989 if (bdaddr_type_is_le(pi->chan->src_type)) {
990 sk->sk_state = BT_CONNECTED;
991 pi->chan->state = BT_CONNECTED;
992 __l2cap_le_connect_rsp_defer(pi->chan);
994 sk->sk_state = BT_CONFIG;
995 pi->chan->state = BT_CONFIG;
996 __l2cap_connect_rsp_defer(pi->chan);
1005 if (sock->type == SOCK_STREAM)
1006 err = bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
1008 err = bt_sock_recvmsg(iocb, sock, msg, len, flags);
1010 if (pi->chan->mode != L2CAP_MODE_ERTM)
1013 /* Attempt to put pending rx data in the socket buffer */
1017 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1020 if (pi->rx_busy_skb) {
1021 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1022 pi->rx_busy_skb = NULL;
1027 /* Restore data flow when half of the receive buffer is
1028 * available. This avoids resending large numbers of
1031 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1032 l2cap_chan_busy(pi->chan, 0);
1039 /* Kill socket (only if zapped and orphan)
1040 * Must be called on unlocked socket.
1042 static void l2cap_sock_kill(struct sock *sk)
1044 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1047 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1049 /* Kill poor orphan */
1051 l2cap_chan_put(l2cap_pi(sk)->chan);
1052 sock_set_flag(sk, SOCK_DEAD);
1056 static int __l2cap_wait_ack(struct sock *sk)
1058 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1059 DECLARE_WAITQUEUE(wait, current);
1063 add_wait_queue(sk_sleep(sk), &wait);
1064 set_current_state(TASK_INTERRUPTIBLE);
1065 while (chan->unacked_frames > 0 && chan->conn) {
1069 if (signal_pending(current)) {
1070 err = sock_intr_errno(timeo);
1075 timeo = schedule_timeout(timeo);
1077 set_current_state(TASK_INTERRUPTIBLE);
1079 err = sock_error(sk);
1083 set_current_state(TASK_RUNNING);
1084 remove_wait_queue(sk_sleep(sk), &wait);
1088 static int l2cap_sock_shutdown(struct socket *sock, int how)
1090 struct sock *sk = sock->sk;
1091 struct l2cap_chan *chan;
1092 struct l2cap_conn *conn;
1095 BT_DBG("sock %p, sk %p", sock, sk);
1100 chan = l2cap_pi(sk)->chan;
1104 mutex_lock(&conn->chan_lock);
1106 l2cap_chan_lock(chan);
1109 if (!sk->sk_shutdown) {
1110 if (chan->mode == L2CAP_MODE_ERTM)
1111 err = __l2cap_wait_ack(sk);
1113 sk->sk_shutdown = SHUTDOWN_MASK;
1116 l2cap_chan_close(chan, 0);
1119 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
1120 err = bt_sock_wait_state(sk, BT_CLOSED,
1124 if (!err && sk->sk_err)
1128 l2cap_chan_unlock(chan);
1131 mutex_unlock(&conn->chan_lock);
1136 static int l2cap_sock_release(struct socket *sock)
1138 struct sock *sk = sock->sk;
1141 BT_DBG("sock %p, sk %p", sock, sk);
1146 bt_sock_unlink(&l2cap_sk_list, sk);
1148 err = l2cap_sock_shutdown(sock, 2);
1151 l2cap_sock_kill(sk);
1155 static void l2cap_sock_cleanup_listen(struct sock *parent)
1159 BT_DBG("parent %p", parent);
1161 /* Close not yet accepted channels */
1162 while ((sk = bt_accept_dequeue(parent, NULL))) {
1163 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1165 l2cap_chan_lock(chan);
1166 __clear_chan_timer(chan);
1167 l2cap_chan_close(chan, ECONNRESET);
1168 l2cap_chan_unlock(chan);
1170 l2cap_sock_kill(sk);
1174 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1176 struct sock *sk, *parent = chan->data;
1180 /* Check for backlog size */
1181 if (sk_acceptq_is_full(parent)) {
1182 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1186 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1191 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1193 l2cap_sock_init(sk, parent);
1195 bt_accept_enqueue(parent, sk);
1197 release_sock(parent);
1199 return l2cap_pi(sk)->chan;
1202 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1204 struct sock *sk = chan->data;
1209 if (l2cap_pi(sk)->rx_busy_skb) {
1214 err = sock_queue_rcv_skb(sk, skb);
1216 /* For ERTM, handle one skb that doesn't fit into the recv
1217 * buffer. This is important to do because the data frames
1218 * have already been acked, so the skb cannot be discarded.
1220 * Notify the l2cap core that the buffer is full, so the
1221 * LOCAL_BUSY state is entered and no more frames are
1222 * acked and reassembled until there is buffer space
1225 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1226 l2cap_pi(sk)->rx_busy_skb = skb;
1227 l2cap_chan_busy(chan, 1);
1237 static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1239 struct sock *sk = chan->data;
1241 l2cap_sock_kill(sk);
1244 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1246 struct sock *sk = chan->data;
1247 struct sock *parent;
1251 parent = bt_sk(sk)->parent;
1253 sock_set_flag(sk, SOCK_ZAPPED);
1255 switch (chan->state) {
1261 l2cap_sock_cleanup_listen(sk);
1262 sk->sk_state = BT_CLOSED;
1263 chan->state = BT_CLOSED;
1267 sk->sk_state = BT_CLOSED;
1268 chan->state = BT_CLOSED;
1273 bt_accept_unlink(sk);
1274 parent->sk_data_ready(parent);
1276 sk->sk_state_change(sk);
1285 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1288 struct sock *sk = chan->data;
1290 sk->sk_state = state;
1296 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1297 unsigned long len, int nb)
1299 struct sock *sk = chan->data;
1300 struct sk_buff *skb;
1303 l2cap_chan_unlock(chan);
1304 skb = bt_skb_send_alloc(sk, len, nb, &err);
1305 l2cap_chan_lock(chan);
1308 return ERR_PTR(err);
1310 bt_cb(skb)->chan = chan;
1315 static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1317 struct sock *sk = chan->data;
1318 struct sock *parent;
1322 parent = bt_sk(sk)->parent;
1324 BT_DBG("sk %p, parent %p", sk, parent);
1326 sk->sk_state = BT_CONNECTED;
1327 sk->sk_state_change(sk);
1330 parent->sk_data_ready(parent);
1335 static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1337 struct sock *parent, *sk = chan->data;
1341 parent = bt_sk(sk)->parent;
1343 parent->sk_data_ready(parent);
1348 static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1350 struct sock *sk = chan->data;
1352 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1353 sk->sk_state_change(sk);
1356 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1358 struct sock *sk = chan->data;
1361 sk->sk_shutdown = SHUTDOWN_MASK;
1365 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1367 struct sock *sk = chan->data;
1369 return sk->sk_sndtimeo;
1372 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1374 struct sock *sk = chan->data;
1376 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1377 sk->sk_state_change(sk);
1380 static struct l2cap_ops l2cap_chan_ops = {
1381 .name = "L2CAP Socket Interface",
1382 .new_connection = l2cap_sock_new_connection_cb,
1383 .recv = l2cap_sock_recv_cb,
1384 .close = l2cap_sock_close_cb,
1385 .teardown = l2cap_sock_teardown_cb,
1386 .state_change = l2cap_sock_state_change_cb,
1387 .ready = l2cap_sock_ready_cb,
1388 .defer = l2cap_sock_defer_cb,
1389 .resume = l2cap_sock_resume_cb,
1390 .suspend = l2cap_sock_suspend_cb,
1391 .set_shutdown = l2cap_sock_set_shutdown_cb,
1392 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1393 .alloc_skb = l2cap_sock_alloc_skb_cb,
1396 static void l2cap_sock_destruct(struct sock *sk)
1398 BT_DBG("sk %p", sk);
1400 if (l2cap_pi(sk)->chan)
1401 l2cap_chan_put(l2cap_pi(sk)->chan);
1403 if (l2cap_pi(sk)->rx_busy_skb) {
1404 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1405 l2cap_pi(sk)->rx_busy_skb = NULL;
1408 skb_queue_purge(&sk->sk_receive_queue);
1409 skb_queue_purge(&sk->sk_write_queue);
1412 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1415 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1417 memset(la, 0, sizeof(struct sockaddr_l2));
1418 la->l2_family = AF_BLUETOOTH;
1419 la->l2_psm = bt_cb(skb)->psm;
1420 bacpy(&la->l2_bdaddr, &bt_cb(skb)->bdaddr);
1422 *msg_namelen = sizeof(struct sockaddr_l2);
1425 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1427 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1429 BT_DBG("sk %p", sk);
1432 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1434 sk->sk_type = parent->sk_type;
1435 bt_sk(sk)->flags = bt_sk(parent)->flags;
1437 chan->chan_type = pchan->chan_type;
1438 chan->imtu = pchan->imtu;
1439 chan->omtu = pchan->omtu;
1440 chan->conf_state = pchan->conf_state;
1441 chan->mode = pchan->mode;
1442 chan->fcs = pchan->fcs;
1443 chan->max_tx = pchan->max_tx;
1444 chan->tx_win = pchan->tx_win;
1445 chan->tx_win_max = pchan->tx_win_max;
1446 chan->sec_level = pchan->sec_level;
1447 chan->flags = pchan->flags;
1448 chan->tx_credits = pchan->tx_credits;
1449 chan->rx_credits = pchan->rx_credits;
1451 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1452 chan->scid = pchan->scid;
1453 chan->dcid = pchan->scid;
1456 security_sk_clone(parent, sk);
1458 switch (sk->sk_type) {
1460 chan->chan_type = L2CAP_CHAN_RAW;
1463 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1464 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1466 case SOCK_SEQPACKET:
1468 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1472 chan->imtu = L2CAP_DEFAULT_MTU;
1474 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1475 chan->mode = L2CAP_MODE_ERTM;
1476 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1478 chan->mode = L2CAP_MODE_BASIC;
1481 l2cap_chan_set_defaults(chan);
1484 /* Default config options */
1485 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1488 chan->ops = &l2cap_chan_ops;
1491 static struct proto l2cap_proto = {
1493 .owner = THIS_MODULE,
1494 .obj_size = sizeof(struct l2cap_pinfo)
1497 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1498 int proto, gfp_t prio)
1501 struct l2cap_chan *chan;
1503 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1507 sock_init_data(sock, sk);
1508 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1510 sk->sk_destruct = l2cap_sock_destruct;
1511 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1513 sock_reset_flag(sk, SOCK_ZAPPED);
1515 sk->sk_protocol = proto;
1516 sk->sk_state = BT_OPEN;
1518 chan = l2cap_chan_create();
1524 l2cap_chan_hold(chan);
1526 l2cap_pi(sk)->chan = chan;
1531 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1536 BT_DBG("sock %p", sock);
1538 sock->state = SS_UNCONNECTED;
1540 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1541 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1542 return -ESOCKTNOSUPPORT;
1544 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1547 sock->ops = &l2cap_sock_ops;
1549 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1553 l2cap_sock_init(sk, NULL);
1554 bt_sock_link(&l2cap_sk_list, sk);
1558 static const struct proto_ops l2cap_sock_ops = {
1559 .family = PF_BLUETOOTH,
1560 .owner = THIS_MODULE,
1561 .release = l2cap_sock_release,
1562 .bind = l2cap_sock_bind,
1563 .connect = l2cap_sock_connect,
1564 .listen = l2cap_sock_listen,
1565 .accept = l2cap_sock_accept,
1566 .getname = l2cap_sock_getname,
1567 .sendmsg = l2cap_sock_sendmsg,
1568 .recvmsg = l2cap_sock_recvmsg,
1569 .poll = bt_sock_poll,
1570 .ioctl = bt_sock_ioctl,
1571 .mmap = sock_no_mmap,
1572 .socketpair = sock_no_socketpair,
1573 .shutdown = l2cap_sock_shutdown,
1574 .setsockopt = l2cap_sock_setsockopt,
1575 .getsockopt = l2cap_sock_getsockopt
1578 static const struct net_proto_family l2cap_sock_family_ops = {
1579 .family = PF_BLUETOOTH,
1580 .owner = THIS_MODULE,
1581 .create = l2cap_sock_create,
1584 int __init l2cap_init_sockets(void)
1588 err = proto_register(&l2cap_proto, 0);
1592 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1594 BT_ERR("L2CAP socket registration failed");
1598 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1601 BT_ERR("Failed to create L2CAP proc file");
1602 bt_sock_unregister(BTPROTO_L2CAP);
1606 BT_INFO("L2CAP socket layer initialized");
1611 proto_unregister(&l2cap_proto);
1615 void l2cap_cleanup_sockets(void)
1617 bt_procfs_cleanup(&init_net, "l2cap");
1618 bt_sock_unregister(BTPROTO_L2CAP);
1619 proto_unregister(&l2cap_proto);