2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
25 /* Bluetooth L2CAP core and sockets. */
27 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/capability.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/slab.h>
35 #include <linux/poll.h>
36 #include <linux/fcntl.h>
37 #include <linux/init.h>
38 #include <linux/interrupt.h>
39 #include <linux/socket.h>
40 #include <linux/skbuff.h>
41 #include <linux/list.h>
42 #include <linux/device.h>
45 #include <asm/system.h>
46 #include <asm/uaccess.h>
47 #include <asm/unaligned.h>
49 #include <net/bluetooth/bluetooth.h>
50 #include <net/bluetooth/hci_core.h>
51 #include <net/bluetooth/l2cap.h>
53 #ifndef CONFIG_BT_L2CAP_DEBUG
60 static const struct proto_ops l2cap_sock_ops;
62 static struct bt_sock_list l2cap_sk_list = {
63 .lock = RW_LOCK_UNLOCKED
66 static void __l2cap_sock_close(struct sock *sk, int reason);
67 static void l2cap_sock_close(struct sock *sk);
68 static void l2cap_sock_kill(struct sock *sk);
70 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
71 u8 code, u8 ident, u16 dlen, void *data);
73 /* ---- L2CAP timers ---- */
74 static void l2cap_sock_timeout(unsigned long arg)
76 struct sock *sk = (struct sock *) arg;
78 BT_DBG("sock %p state %d", sk, sk->sk_state);
81 __l2cap_sock_close(sk, ETIMEDOUT);
88 static void l2cap_sock_set_timer(struct sock *sk, long timeout)
90 BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
91 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
94 static void l2cap_sock_clear_timer(struct sock *sk)
96 BT_DBG("sock %p state %d", sk, sk->sk_state);
97 sk_stop_timer(sk, &sk->sk_timer);
100 static void l2cap_sock_init_timer(struct sock *sk)
102 init_timer(&sk->sk_timer);
103 sk->sk_timer.function = l2cap_sock_timeout;
104 sk->sk_timer.data = (unsigned long)sk;
107 /* ---- L2CAP channels ---- */
108 static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
111 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
112 if (l2cap_pi(s)->dcid == cid)
118 static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
121 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
122 if (l2cap_pi(s)->scid == cid)
128 /* Find channel with given SCID.
129 * Returns locked socket */
130 static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
134 s = __l2cap_get_chan_by_scid(l, cid);
135 if (s) bh_lock_sock(s);
136 read_unlock(&l->lock);
140 static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
143 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
144 if (l2cap_pi(s)->ident == ident)
150 static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
154 s = __l2cap_get_chan_by_ident(l, ident);
155 if (s) bh_lock_sock(s);
156 read_unlock(&l->lock);
160 static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
164 for (; cid < 0xffff; cid++) {
165 if(!__l2cap_get_chan_by_scid(l, cid))
172 static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
177 l2cap_pi(l->head)->prev_c = sk;
179 l2cap_pi(sk)->next_c = l->head;
180 l2cap_pi(sk)->prev_c = NULL;
184 static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
186 struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
188 write_lock_bh(&l->lock);
193 l2cap_pi(next)->prev_c = prev;
195 l2cap_pi(prev)->next_c = next;
196 write_unlock_bh(&l->lock);
201 static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
203 struct l2cap_chan_list *l = &conn->chan_list;
205 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
207 l2cap_pi(sk)->conn = conn;
209 if (sk->sk_type == SOCK_SEQPACKET) {
210 /* Alloc CID for connection-oriented socket */
211 l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
212 } else if (sk->sk_type == SOCK_DGRAM) {
213 /* Connectionless socket */
214 l2cap_pi(sk)->scid = 0x0002;
215 l2cap_pi(sk)->dcid = 0x0002;
216 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
218 /* Raw socket can send/recv signalling messages only */
219 l2cap_pi(sk)->scid = 0x0001;
220 l2cap_pi(sk)->dcid = 0x0001;
221 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
224 __l2cap_chan_link(l, sk);
227 bt_accept_enqueue(parent, sk);
231 * Must be called on the locked socket. */
232 static void l2cap_chan_del(struct sock *sk, int err)
234 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
235 struct sock *parent = bt_sk(sk)->parent;
237 l2cap_sock_clear_timer(sk);
239 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
242 /* Unlink from channel list */
243 l2cap_chan_unlink(&conn->chan_list, sk);
244 l2cap_pi(sk)->conn = NULL;
245 hci_conn_put(conn->hcon);
248 sk->sk_state = BT_CLOSED;
249 sock_set_flag(sk, SOCK_ZAPPED);
255 bt_accept_unlink(sk);
256 parent->sk_data_ready(parent, 0);
258 sk->sk_state_change(sk);
261 /* ---- L2CAP connections ---- */
262 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
264 struct l2cap_conn *conn = hcon->l2cap_data;
269 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
273 hcon->l2cap_data = conn;
276 BT_DBG("hcon %p conn %p", hcon, conn);
278 conn->mtu = hcon->hdev->acl_mtu;
279 conn->src = &hcon->hdev->bdaddr;
280 conn->dst = &hcon->dst;
282 spin_lock_init(&conn->lock);
283 rwlock_init(&conn->chan_list.lock);
288 static void l2cap_conn_del(struct hci_conn *hcon, int err)
290 struct l2cap_conn *conn = hcon->l2cap_data;
296 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
299 kfree_skb(conn->rx_skb);
302 while ((sk = conn->chan_list.head)) {
304 l2cap_chan_del(sk, err);
309 hcon->l2cap_data = NULL;
313 static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
315 struct l2cap_chan_list *l = &conn->chan_list;
316 write_lock_bh(&l->lock);
317 __l2cap_chan_add(conn, sk, parent);
318 write_unlock_bh(&l->lock);
321 static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
325 /* Get next available identificator.
326 * 1 - 128 are used by kernel.
327 * 129 - 199 are reserved.
328 * 200 - 254 are used by utilities like l2ping, etc.
331 spin_lock_bh(&conn->lock);
333 if (++conn->tx_ident > 128)
338 spin_unlock_bh(&conn->lock);
343 static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
345 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
347 BT_DBG("code 0x%2.2x", code);
352 return hci_send_acl(conn->hcon, skb, 0);
355 /* ---- Socket interface ---- */
356 static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
359 struct hlist_node *node;
360 sk_for_each(sk, node, &l2cap_sk_list.head)
361 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
368 /* Find socket with psm and source bdaddr.
369 * Returns closest match.
371 static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
373 struct sock *sk = NULL, *sk1 = NULL;
374 struct hlist_node *node;
376 sk_for_each(sk, node, &l2cap_sk_list.head) {
377 if (state && sk->sk_state != state)
380 if (l2cap_pi(sk)->psm == psm) {
382 if (!bacmp(&bt_sk(sk)->src, src))
386 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
390 return node ? sk : sk1;
393 /* Find socket with given address (psm, src).
394 * Returns locked socket */
395 static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
398 read_lock(&l2cap_sk_list.lock);
399 s = __l2cap_get_sock_by_psm(state, psm, src);
400 if (s) bh_lock_sock(s);
401 read_unlock(&l2cap_sk_list.lock);
405 static void l2cap_sock_destruct(struct sock *sk)
409 skb_queue_purge(&sk->sk_receive_queue);
410 skb_queue_purge(&sk->sk_write_queue);
413 static void l2cap_sock_cleanup_listen(struct sock *parent)
417 BT_DBG("parent %p", parent);
419 /* Close not yet accepted channels */
420 while ((sk = bt_accept_dequeue(parent, NULL)))
421 l2cap_sock_close(sk);
423 parent->sk_state = BT_CLOSED;
424 sock_set_flag(parent, SOCK_ZAPPED);
427 /* Kill socket (only if zapped and orphan)
428 * Must be called on unlocked socket.
430 static void l2cap_sock_kill(struct sock *sk)
432 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
435 BT_DBG("sk %p state %d", sk, sk->sk_state);
437 /* Kill poor orphan */
438 bt_sock_unlink(&l2cap_sk_list, sk);
439 sock_set_flag(sk, SOCK_DEAD);
443 static void __l2cap_sock_close(struct sock *sk, int reason)
445 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
447 switch (sk->sk_state) {
449 l2cap_sock_cleanup_listen(sk);
455 if (sk->sk_type == SOCK_SEQPACKET) {
456 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
457 struct l2cap_disconn_req req;
459 sk->sk_state = BT_DISCONN;
460 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
462 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
463 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
464 l2cap_send_cmd(conn, l2cap_get_ident(conn),
465 L2CAP_DISCONN_REQ, sizeof(req), &req);
467 l2cap_chan_del(sk, reason);
473 l2cap_chan_del(sk, reason);
477 sock_set_flag(sk, SOCK_ZAPPED);
482 /* Must be called on unlocked socket. */
483 static void l2cap_sock_close(struct sock *sk)
485 l2cap_sock_clear_timer(sk);
487 __l2cap_sock_close(sk, ECONNRESET);
492 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
494 struct l2cap_pinfo *pi = l2cap_pi(sk);
499 sk->sk_type = parent->sk_type;
500 pi->imtu = l2cap_pi(parent)->imtu;
501 pi->omtu = l2cap_pi(parent)->omtu;
502 pi->link_mode = l2cap_pi(parent)->link_mode;
504 pi->imtu = L2CAP_DEFAULT_MTU;
509 /* Default config options */
511 pi->conf_mtu = L2CAP_DEFAULT_MTU;
512 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
515 static struct proto l2cap_proto = {
517 .owner = THIS_MODULE,
518 .obj_size = sizeof(struct l2cap_pinfo)
521 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
525 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, 1);
529 sock_init_data(sock, sk);
530 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
532 sk->sk_destruct = l2cap_sock_destruct;
533 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
535 sock_reset_flag(sk, SOCK_ZAPPED);
537 sk->sk_protocol = proto;
538 sk->sk_state = BT_OPEN;
540 l2cap_sock_init_timer(sk);
542 bt_sock_link(&l2cap_sk_list, sk);
546 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol)
550 BT_DBG("sock %p", sock);
552 sock->state = SS_UNCONNECTED;
554 if (sock->type != SOCK_SEQPACKET &&
555 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
556 return -ESOCKTNOSUPPORT;
558 if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW))
561 sock->ops = &l2cap_sock_ops;
563 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
567 l2cap_sock_init(sk, NULL);
571 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
573 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
574 struct sock *sk = sock->sk;
577 BT_DBG("sk %p, %s %d", sk, batostr(&la->l2_bdaddr), la->l2_psm);
579 if (!addr || addr->sa_family != AF_BLUETOOTH)
584 if (sk->sk_state != BT_OPEN) {
589 if (la->l2_psm && btohs(la->l2_psm) < 0x1001 &&
590 !capable(CAP_NET_BIND_SERVICE)) {
595 write_lock_bh(&l2cap_sk_list.lock);
597 if (la->l2_psm && __l2cap_get_sock_by_addr(la->l2_psm, &la->l2_bdaddr)) {
600 /* Save source address */
601 bacpy(&bt_sk(sk)->src, &la->l2_bdaddr);
602 l2cap_pi(sk)->psm = la->l2_psm;
603 l2cap_pi(sk)->sport = la->l2_psm;
604 sk->sk_state = BT_BOUND;
607 write_unlock_bh(&l2cap_sk_list.lock);
614 static int l2cap_do_connect(struct sock *sk)
616 bdaddr_t *src = &bt_sk(sk)->src;
617 bdaddr_t *dst = &bt_sk(sk)->dst;
618 struct l2cap_conn *conn;
619 struct hci_conn *hcon;
620 struct hci_dev *hdev;
623 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), l2cap_pi(sk)->psm);
625 if (!(hdev = hci_get_route(dst, src)))
626 return -EHOSTUNREACH;
628 hci_dev_lock_bh(hdev);
632 hcon = hci_connect(hdev, ACL_LINK, dst);
636 conn = l2cap_conn_add(hcon, 0);
644 /* Update source addr of the socket */
645 bacpy(src, conn->src);
647 l2cap_chan_add(conn, sk, NULL);
649 sk->sk_state = BT_CONNECT;
650 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
652 if (hcon->state == BT_CONNECTED) {
653 if (sk->sk_type == SOCK_SEQPACKET) {
654 struct l2cap_conn_req req;
655 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
656 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
657 req.psm = l2cap_pi(sk)->psm;
658 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
659 L2CAP_CONN_REQ, sizeof(req), &req);
661 l2cap_sock_clear_timer(sk);
662 sk->sk_state = BT_CONNECTED;
667 hci_dev_unlock_bh(hdev);
672 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
674 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
675 struct sock *sk = sock->sk;
682 if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_l2)) {
687 if (sk->sk_type == SOCK_SEQPACKET && !la->l2_psm) {
692 switch(sk->sk_state) {
696 /* Already connecting */
700 /* Already connected */
713 /* Set destination address and psm */
714 bacpy(&bt_sk(sk)->dst, &la->l2_bdaddr);
715 l2cap_pi(sk)->psm = la->l2_psm;
717 if ((err = l2cap_do_connect(sk)))
721 err = bt_sock_wait_state(sk, BT_CONNECTED,
722 sock_sndtimeo(sk, flags & O_NONBLOCK));
728 static int l2cap_sock_listen(struct socket *sock, int backlog)
730 struct sock *sk = sock->sk;
733 BT_DBG("sk %p backlog %d", sk, backlog);
737 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
742 if (!l2cap_pi(sk)->psm) {
743 bdaddr_t *src = &bt_sk(sk)->src;
748 write_lock_bh(&l2cap_sk_list.lock);
750 for (psm = 0x1001; psm < 0x1100; psm += 2)
751 if (!__l2cap_get_sock_by_addr(htobs(psm), src)) {
752 l2cap_pi(sk)->psm = htobs(psm);
753 l2cap_pi(sk)->sport = htobs(psm);
758 write_unlock_bh(&l2cap_sk_list.lock);
764 sk->sk_max_ack_backlog = backlog;
765 sk->sk_ack_backlog = 0;
766 sk->sk_state = BT_LISTEN;
773 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
775 DECLARE_WAITQUEUE(wait, current);
776 struct sock *sk = sock->sk, *nsk;
780 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
782 if (sk->sk_state != BT_LISTEN) {
787 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
789 BT_DBG("sk %p timeo %ld", sk, timeo);
791 /* Wait for an incoming connection. (wake-one). */
792 add_wait_queue_exclusive(sk->sk_sleep, &wait);
793 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
794 set_current_state(TASK_INTERRUPTIBLE);
801 timeo = schedule_timeout(timeo);
802 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
804 if (sk->sk_state != BT_LISTEN) {
809 if (signal_pending(current)) {
810 err = sock_intr_errno(timeo);
814 set_current_state(TASK_RUNNING);
815 remove_wait_queue(sk->sk_sleep, &wait);
820 newsock->state = SS_CONNECTED;
822 BT_DBG("new socket %p", nsk);
829 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
831 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
832 struct sock *sk = sock->sk;
834 BT_DBG("sock %p, sk %p", sock, sk);
836 addr->sa_family = AF_BLUETOOTH;
837 *len = sizeof(struct sockaddr_l2);
840 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
842 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
844 la->l2_psm = l2cap_pi(sk)->psm;
848 static inline int l2cap_do_send(struct sock *sk, struct msghdr *msg, int len)
850 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
851 struct sk_buff *skb, **frag;
852 int err, hlen, count, sent=0;
853 struct l2cap_hdr *lh;
855 BT_DBG("sk %p len %d", sk, len);
857 /* First fragment (with L2CAP header) */
858 if (sk->sk_type == SOCK_DGRAM)
859 hlen = L2CAP_HDR_SIZE + 2;
861 hlen = L2CAP_HDR_SIZE;
863 count = min_t(unsigned int, (conn->mtu - hlen), len);
865 skb = bt_skb_send_alloc(sk, hlen + count,
866 msg->msg_flags & MSG_DONTWAIT, &err);
870 /* Create L2CAP header */
871 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
872 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
873 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
875 if (sk->sk_type == SOCK_DGRAM)
876 put_unaligned(l2cap_pi(sk)->psm, (__le16 *) skb_put(skb, 2));
878 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
886 /* Continuation fragments (no L2CAP header) */
887 frag = &skb_shinfo(skb)->frag_list;
889 count = min_t(unsigned int, conn->mtu, len);
891 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
895 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) {
903 frag = &(*frag)->next;
906 if ((err = hci_send_acl(conn->hcon, skb, 0)) < 0)
916 static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
918 struct sock *sk = sock->sk;
921 BT_DBG("sock %p, sk %p", sock, sk);
923 err = sock_error(sk);
927 if (msg->msg_flags & MSG_OOB)
930 /* Check outgoing MTU */
931 if (sk->sk_type != SOCK_RAW && len > l2cap_pi(sk)->omtu)
936 if (sk->sk_state == BT_CONNECTED)
937 err = l2cap_do_send(sk, msg, len);
945 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
947 struct sock *sk = sock->sk;
948 struct l2cap_options opts;
958 opts.imtu = l2cap_pi(sk)->imtu;
959 opts.omtu = l2cap_pi(sk)->omtu;
960 opts.flush_to = l2cap_pi(sk)->flush_to;
963 len = min_t(unsigned int, sizeof(opts), optlen);
964 if (copy_from_user((char *) &opts, optval, len)) {
969 l2cap_pi(sk)->imtu = opts.imtu;
970 l2cap_pi(sk)->omtu = opts.omtu;
974 if (get_user(opt, (u32 __user *) optval)) {
979 l2cap_pi(sk)->link_mode = opt;
991 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
993 struct sock *sk = sock->sk;
994 struct l2cap_options opts;
995 struct l2cap_conninfo cinfo;
1000 if (get_user(len, optlen))
1007 opts.imtu = l2cap_pi(sk)->imtu;
1008 opts.omtu = l2cap_pi(sk)->omtu;
1009 opts.flush_to = l2cap_pi(sk)->flush_to;
1012 len = min_t(unsigned int, len, sizeof(opts));
1013 if (copy_to_user(optval, (char *) &opts, len))
1019 if (put_user(l2cap_pi(sk)->link_mode, (u32 __user *) optval))
1023 case L2CAP_CONNINFO:
1024 if (sk->sk_state != BT_CONNECTED) {
1029 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
1030 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
1032 len = min_t(unsigned int, len, sizeof(cinfo));
1033 if (copy_to_user(optval, (char *) &cinfo, len))
1047 static int l2cap_sock_shutdown(struct socket *sock, int how)
1049 struct sock *sk = sock->sk;
1052 BT_DBG("sock %p, sk %p", sock, sk);
1058 if (!sk->sk_shutdown) {
1059 sk->sk_shutdown = SHUTDOWN_MASK;
1060 l2cap_sock_clear_timer(sk);
1061 __l2cap_sock_close(sk, 0);
1063 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
1064 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1070 static int l2cap_sock_release(struct socket *sock)
1072 struct sock *sk = sock->sk;
1075 BT_DBG("sock %p, sk %p", sock, sk);
1080 err = l2cap_sock_shutdown(sock, 2);
1083 l2cap_sock_kill(sk);
1087 static void l2cap_conn_ready(struct l2cap_conn *conn)
1089 struct l2cap_chan_list *l = &conn->chan_list;
1092 BT_DBG("conn %p", conn);
1094 read_lock(&l->lock);
1096 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
1099 if (sk->sk_type != SOCK_SEQPACKET) {
1100 l2cap_sock_clear_timer(sk);
1101 sk->sk_state = BT_CONNECTED;
1102 sk->sk_state_change(sk);
1103 } else if (sk->sk_state == BT_CONNECT) {
1104 struct l2cap_conn_req req;
1105 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
1106 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
1107 req.psm = l2cap_pi(sk)->psm;
1108 l2cap_send_cmd(conn, l2cap_pi(sk)->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1114 read_unlock(&l->lock);
1117 /* Notify sockets that we cannot guaranty reliability anymore */
1118 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1120 struct l2cap_chan_list *l = &conn->chan_list;
1123 BT_DBG("conn %p", conn);
1125 read_lock(&l->lock);
1126 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
1127 if (l2cap_pi(sk)->link_mode & L2CAP_LM_RELIABLE)
1130 read_unlock(&l->lock);
1133 static void l2cap_chan_ready(struct sock *sk)
1135 struct sock *parent = bt_sk(sk)->parent;
1137 BT_DBG("sk %p, parent %p", sk, parent);
1139 l2cap_pi(sk)->conf_state = 0;
1140 l2cap_sock_clear_timer(sk);
1143 /* Outgoing channel.
1144 * Wake up socket sleeping on connect.
1146 sk->sk_state = BT_CONNECTED;
1147 sk->sk_state_change(sk);
1149 /* Incoming channel.
1150 * Wake up socket sleeping on accept.
1152 parent->sk_data_ready(parent, 0);
1156 /* Copy frame to all raw sockets on that connection */
1157 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1159 struct l2cap_chan_list *l = &conn->chan_list;
1160 struct sk_buff *nskb;
1163 BT_DBG("conn %p", conn);
1165 read_lock(&l->lock);
1166 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
1167 if (sk->sk_type != SOCK_RAW)
1170 /* Don't send frame to the socket it came from */
1174 if (!(nskb = skb_clone(skb, GFP_ATOMIC)))
1177 if (sock_queue_rcv_skb(sk, nskb))
1180 read_unlock(&l->lock);
1183 /* ---- L2CAP signalling commands ---- */
1184 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1185 u8 code, u8 ident, u16 dlen, void *data)
1187 struct sk_buff *skb, **frag;
1188 struct l2cap_cmd_hdr *cmd;
1189 struct l2cap_hdr *lh;
1192 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", conn, code, ident, dlen);
1194 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1195 count = min_t(unsigned int, conn->mtu, len);
1197 skb = bt_skb_alloc(count, GFP_ATOMIC);
1201 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1202 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
1203 lh->cid = cpu_to_le16(0x0001);
1205 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1208 cmd->len = cpu_to_le16(dlen);
1211 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1212 memcpy(skb_put(skb, count), data, count);
1218 /* Continuation fragments (no L2CAP header) */
1219 frag = &skb_shinfo(skb)->frag_list;
1221 count = min_t(unsigned int, conn->mtu, len);
1223 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1227 memcpy(skb_put(*frag, count), data, count);
1232 frag = &(*frag)->next;
1242 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1244 struct l2cap_conf_opt *opt = *ptr;
1247 len = L2CAP_CONF_OPT_SIZE + opt->len;
1255 *val = *((u8 *) opt->val);
1259 *val = __le16_to_cpu(*((__le16 *)opt->val));
1263 *val = __le32_to_cpu(*((__le32 *)opt->val));
1267 *val = (unsigned long) opt->val;
1271 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1275 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1277 struct l2cap_conf_opt *opt = *ptr;
1279 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1286 *((u8 *) opt->val) = val;
1290 *((__le16 *) opt->val) = cpu_to_le16(val);
1294 *((__le32 *) opt->val) = cpu_to_le32(val);
1298 memcpy(opt->val, (void *) val, len);
1302 *ptr += L2CAP_CONF_OPT_SIZE + len;
1305 static int l2cap_build_conf_req(struct sock *sk, void *data)
1307 struct l2cap_pinfo *pi = l2cap_pi(sk);
1308 struct l2cap_conf_req *req = data;
1309 void *ptr = req->data;
1311 BT_DBG("sk %p", sk);
1313 if (pi->imtu != L2CAP_DEFAULT_MTU)
1314 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
1316 /* FIXME: Need actual value of the flush timeout */
1317 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
1318 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
1320 req->dcid = cpu_to_le16(pi->dcid);
1321 req->flags = cpu_to_le16(0);
1326 static int l2cap_parse_conf_req(struct sock *sk, void *data)
1328 struct l2cap_pinfo *pi = l2cap_pi(sk);
1329 struct l2cap_conf_rsp *rsp = data;
1330 void *ptr = rsp->data;
1331 void *req = pi->conf_req;
1332 int len = pi->conf_len;
1333 int type, hint, olen;
1335 u16 result = L2CAP_CONF_SUCCESS;
1337 BT_DBG("sk %p", sk);
1339 while (len >= L2CAP_CONF_OPT_SIZE) {
1340 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1346 case L2CAP_CONF_MTU:
1350 case L2CAP_CONF_FLUSH_TO:
1354 case L2CAP_CONF_QOS:
1361 result = L2CAP_CONF_UNKNOWN;
1362 *((u8 *) ptr++) = type;
1367 if (result == L2CAP_CONF_SUCCESS) {
1368 /* Configure output options and let the other side know
1369 * which ones we don't like. */
1371 if (pi->conf_mtu < pi->omtu)
1372 result = L2CAP_CONF_UNACCEPT;
1374 pi->omtu = pi->conf_mtu;
1375 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
1378 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
1381 rsp->scid = cpu_to_le16(pi->dcid);
1382 rsp->result = cpu_to_le16(result);
1383 rsp->flags = cpu_to_le16(0x0000);
1388 static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1390 struct l2cap_conf_rsp *rsp = data;
1391 void *ptr = rsp->data;
1393 BT_DBG("sk %p", sk);
1395 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1396 rsp->result = cpu_to_le16(result);
1397 rsp->flags = cpu_to_le16(flags);
1402 static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1404 struct l2cap_chan_list *list = &conn->chan_list;
1405 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
1406 struct l2cap_conn_rsp rsp;
1407 struct sock *sk, *parent;
1408 int result = 0, status = 0;
1410 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
1411 __le16 psm = req->psm;
1413 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
1415 /* Check if we have socket listening on psm */
1416 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
1418 result = L2CAP_CR_BAD_PSM;
1422 result = L2CAP_CR_NO_MEM;
1424 /* Check for backlog size */
1425 if (sk_acceptq_is_full(parent)) {
1426 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1430 sk = l2cap_sock_alloc(parent->sk_net, NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1434 write_lock_bh(&list->lock);
1436 /* Check if we already have channel with that dcid */
1437 if (__l2cap_get_chan_by_dcid(list, scid)) {
1438 write_unlock_bh(&list->lock);
1439 sock_set_flag(sk, SOCK_ZAPPED);
1440 l2cap_sock_kill(sk);
1444 hci_conn_hold(conn->hcon);
1446 l2cap_sock_init(sk, parent);
1447 bacpy(&bt_sk(sk)->src, conn->src);
1448 bacpy(&bt_sk(sk)->dst, conn->dst);
1449 l2cap_pi(sk)->psm = psm;
1450 l2cap_pi(sk)->dcid = scid;
1452 __l2cap_chan_add(conn, sk, parent);
1453 dcid = l2cap_pi(sk)->scid;
1455 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
1457 /* Service level security */
1458 result = L2CAP_CR_PEND;
1459 status = L2CAP_CS_AUTHEN_PEND;
1460 sk->sk_state = BT_CONNECT2;
1461 l2cap_pi(sk)->ident = cmd->ident;
1463 if ((l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) ||
1464 (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) {
1465 if (!hci_conn_encrypt(conn->hcon))
1467 } else if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH) {
1468 if (!hci_conn_auth(conn->hcon))
1472 sk->sk_state = BT_CONFIG;
1473 result = status = 0;
1476 write_unlock_bh(&list->lock);
1479 bh_unlock_sock(parent);
1482 rsp.scid = cpu_to_le16(scid);
1483 rsp.dcid = cpu_to_le16(dcid);
1484 rsp.result = cpu_to_le16(result);
1485 rsp.status = cpu_to_le16(status);
1486 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1490 static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1492 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
1493 u16 scid, dcid, result, status;
1497 scid = __le16_to_cpu(rsp->scid);
1498 dcid = __le16_to_cpu(rsp->dcid);
1499 result = __le16_to_cpu(rsp->result);
1500 status = __le16_to_cpu(rsp->status);
1502 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
1505 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1508 if (!(sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident)))
1513 case L2CAP_CR_SUCCESS:
1514 sk->sk_state = BT_CONFIG;
1515 l2cap_pi(sk)->ident = 0;
1516 l2cap_pi(sk)->dcid = dcid;
1517 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
1519 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1520 l2cap_build_conf_req(sk, req), req);
1527 l2cap_chan_del(sk, ECONNREFUSED);
1535 static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1537 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
1543 dcid = __le16_to_cpu(req->dcid);
1544 flags = __le16_to_cpu(req->flags);
1546 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
1548 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
1551 if (sk->sk_state == BT_DISCONN)
1554 /* Reject if config buffer is too small. */
1555 len = cmd_len - sizeof(*req);
1556 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
1557 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
1558 l2cap_build_conf_rsp(sk, rsp,
1559 L2CAP_CONF_REJECT, flags), rsp);
1564 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
1565 l2cap_pi(sk)->conf_len += len;
1567 if (flags & 0x0001) {
1568 /* Incomplete config. Send empty response. */
1569 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
1570 l2cap_build_conf_rsp(sk, rsp,
1571 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1575 /* Complete config. */
1576 len = l2cap_parse_conf_req(sk, rsp);
1580 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
1582 /* Reset config buffer. */
1583 l2cap_pi(sk)->conf_len = 0;
1585 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
1588 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
1589 sk->sk_state = BT_CONNECTED;
1590 l2cap_chan_ready(sk);
1594 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
1596 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1597 l2cap_build_conf_req(sk, req), req);
1605 static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1607 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
1608 u16 scid, flags, result;
1611 scid = __le16_to_cpu(rsp->scid);
1612 flags = __le16_to_cpu(rsp->flags);
1613 result = __le16_to_cpu(rsp->result);
1615 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", scid, flags, result);
1617 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1621 case L2CAP_CONF_SUCCESS:
1624 case L2CAP_CONF_UNACCEPT:
1625 if (++l2cap_pi(sk)->conf_retry < L2CAP_CONF_MAX_RETRIES) {
1627 /* It does not make sense to adjust L2CAP parameters
1628 * that are currently defined in the spec. We simply
1629 * resend config request that we sent earlier. It is
1630 * stupid, but it helps qualification testing which
1631 * expects at least some response from us. */
1632 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1633 l2cap_build_conf_req(sk, req), req);
1638 sk->sk_state = BT_DISCONN;
1639 sk->sk_err = ECONNRESET;
1640 l2cap_sock_set_timer(sk, HZ * 5);
1642 struct l2cap_disconn_req req;
1643 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
1644 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
1645 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1646 L2CAP_DISCONN_REQ, sizeof(req), &req);
1654 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
1656 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
1657 sk->sk_state = BT_CONNECTED;
1658 l2cap_chan_ready(sk);
1666 static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1668 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
1669 struct l2cap_disconn_rsp rsp;
1673 scid = __le16_to_cpu(req->scid);
1674 dcid = __le16_to_cpu(req->dcid);
1676 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
1678 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
1681 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1682 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1683 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
1685 sk->sk_shutdown = SHUTDOWN_MASK;
1687 l2cap_chan_del(sk, ECONNRESET);
1690 l2cap_sock_kill(sk);
1694 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1696 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
1700 scid = __le16_to_cpu(rsp->scid);
1701 dcid = __le16_to_cpu(rsp->dcid);
1703 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
1705 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1708 l2cap_chan_del(sk, 0);
1711 l2cap_sock_kill(sk);
1715 static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1717 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1718 struct l2cap_info_rsp rsp;
1721 type = __le16_to_cpu(req->type);
1723 BT_DBG("type 0x%4.4x", type);
1725 rsp.type = cpu_to_le16(type);
1726 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
1727 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), &rsp);
1732 static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1734 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
1737 type = __le16_to_cpu(rsp->type);
1738 result = __le16_to_cpu(rsp->result);
1740 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
1745 static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
1747 u8 *data = skb->data;
1749 struct l2cap_cmd_hdr cmd;
1752 l2cap_raw_recv(conn, skb);
1754 while (len >= L2CAP_CMD_HDR_SIZE) {
1756 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
1757 data += L2CAP_CMD_HDR_SIZE;
1758 len -= L2CAP_CMD_HDR_SIZE;
1760 cmd_len = le16_to_cpu(cmd.len);
1762 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1764 if (cmd_len > len || !cmd.ident) {
1765 BT_DBG("corrupted command");
1770 case L2CAP_COMMAND_REJ:
1771 /* FIXME: We should process this */
1774 case L2CAP_CONN_REQ:
1775 err = l2cap_connect_req(conn, &cmd, data);
1778 case L2CAP_CONN_RSP:
1779 err = l2cap_connect_rsp(conn, &cmd, data);
1782 case L2CAP_CONF_REQ:
1783 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1786 case L2CAP_CONF_RSP:
1787 err = l2cap_config_rsp(conn, &cmd, data);
1790 case L2CAP_DISCONN_REQ:
1791 err = l2cap_disconnect_req(conn, &cmd, data);
1794 case L2CAP_DISCONN_RSP:
1795 err = l2cap_disconnect_rsp(conn, &cmd, data);
1798 case L2CAP_ECHO_REQ:
1799 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1802 case L2CAP_ECHO_RSP:
1805 case L2CAP_INFO_REQ:
1806 err = l2cap_information_req(conn, &cmd, data);
1809 case L2CAP_INFO_RSP:
1810 err = l2cap_information_rsp(conn, &cmd, data);
1814 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
1820 struct l2cap_cmd_rej rej;
1821 BT_DBG("error %d", err);
1823 /* FIXME: Map err to a valid reason */
1824 rej.reason = cpu_to_le16(0);
1825 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
1835 static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
1839 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
1841 BT_DBG("unknown cid 0x%4.4x", cid);
1845 BT_DBG("sk %p, len %d", sk, skb->len);
1847 if (sk->sk_state != BT_CONNECTED)
1850 if (l2cap_pi(sk)->imtu < skb->len)
1853 /* If socket recv buffers overflows we drop data here
1854 * which is *bad* because L2CAP has to be reliable.
1855 * But we don't have any other choice. L2CAP doesn't
1856 * provide flow control mechanism. */
1858 if (!sock_queue_rcv_skb(sk, skb))
1871 static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1875 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
1879 BT_DBG("sk %p, len %d", sk, skb->len);
1881 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
1884 if (l2cap_pi(sk)->imtu < skb->len)
1887 if (!sock_queue_rcv_skb(sk, skb))
1894 if (sk) bh_unlock_sock(sk);
1898 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
1900 struct l2cap_hdr *lh = (void *) skb->data;
1904 skb_pull(skb, L2CAP_HDR_SIZE);
1905 cid = __le16_to_cpu(lh->cid);
1906 len = __le16_to_cpu(lh->len);
1908 BT_DBG("len %d, cid 0x%4.4x", len, cid);
1912 l2cap_sig_channel(conn, skb);
1916 psm = get_unaligned((__le16 *) skb->data);
1918 l2cap_conless_channel(conn, psm, skb);
1922 l2cap_data_channel(conn, cid, skb);
1927 /* ---- L2CAP interface with lower layer (HCI) ---- */
1929 static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
1931 int exact = 0, lm1 = 0, lm2 = 0;
1932 register struct sock *sk;
1933 struct hlist_node *node;
1935 if (type != ACL_LINK)
1938 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
1940 /* Find listening sockets and check their link_mode */
1941 read_lock(&l2cap_sk_list.lock);
1942 sk_for_each(sk, node, &l2cap_sk_list.head) {
1943 if (sk->sk_state != BT_LISTEN)
1946 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
1947 lm1 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
1949 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
1950 lm2 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
1952 read_unlock(&l2cap_sk_list.lock);
1954 return exact ? lm1 : lm2;
1957 static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1959 struct l2cap_conn *conn;
1961 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
1963 if (hcon->type != ACL_LINK)
1967 conn = l2cap_conn_add(hcon, status);
1969 l2cap_conn_ready(conn);
1971 l2cap_conn_del(hcon, bt_err(status));
1976 static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason)
1978 BT_DBG("hcon %p reason %d", hcon, reason);
1980 if (hcon->type != ACL_LINK)
1983 l2cap_conn_del(hcon, bt_err(reason));
1988 static int l2cap_auth_cfm(struct hci_conn *hcon, u8 status)
1990 struct l2cap_chan_list *l;
1991 struct l2cap_conn *conn = conn = hcon->l2cap_data;
1992 struct l2cap_conn_rsp rsp;
1999 l = &conn->chan_list;
2001 BT_DBG("conn %p", conn);
2003 read_lock(&l->lock);
2005 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2008 if (sk->sk_state != BT_CONNECT2 ||
2009 (l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) ||
2010 (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) {
2016 sk->sk_state = BT_CONFIG;
2019 sk->sk_state = BT_DISCONN;
2020 l2cap_sock_set_timer(sk, HZ/10);
2021 result = L2CAP_CR_SEC_BLOCK;
2024 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
2025 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
2026 rsp.result = cpu_to_le16(result);
2027 rsp.status = cpu_to_le16(0);
2028 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
2029 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2034 read_unlock(&l->lock);
2038 static int l2cap_encrypt_cfm(struct hci_conn *hcon, u8 status)
2040 struct l2cap_chan_list *l;
2041 struct l2cap_conn *conn = hcon->l2cap_data;
2042 struct l2cap_conn_rsp rsp;
2049 l = &conn->chan_list;
2051 BT_DBG("conn %p", conn);
2053 read_lock(&l->lock);
2055 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2058 if (sk->sk_state != BT_CONNECT2) {
2064 sk->sk_state = BT_CONFIG;
2067 sk->sk_state = BT_DISCONN;
2068 l2cap_sock_set_timer(sk, HZ/10);
2069 result = L2CAP_CR_SEC_BLOCK;
2072 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
2073 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
2074 rsp.result = cpu_to_le16(result);
2075 rsp.status = cpu_to_le16(0);
2076 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
2077 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2079 if (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)
2080 hci_conn_change_link_key(hcon);
2085 read_unlock(&l->lock);
2089 static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
2091 struct l2cap_conn *conn = hcon->l2cap_data;
2093 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
2096 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
2098 if (flags & ACL_START) {
2099 struct l2cap_hdr *hdr;
2103 BT_ERR("Unexpected start frame (len %d)", skb->len);
2104 kfree_skb(conn->rx_skb);
2105 conn->rx_skb = NULL;
2107 l2cap_conn_unreliable(conn, ECOMM);
2111 BT_ERR("Frame is too short (len %d)", skb->len);
2112 l2cap_conn_unreliable(conn, ECOMM);
2116 hdr = (struct l2cap_hdr *) skb->data;
2117 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
2119 if (len == skb->len) {
2120 /* Complete frame received */
2121 l2cap_recv_frame(conn, skb);
2125 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
2127 if (skb->len > len) {
2128 BT_ERR("Frame is too long (len %d, expected len %d)",
2130 l2cap_conn_unreliable(conn, ECOMM);
2134 /* Allocate skb for the complete frame (with header) */
2135 if (!(conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC)))
2138 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2140 conn->rx_len = len - skb->len;
2142 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
2144 if (!conn->rx_len) {
2145 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
2146 l2cap_conn_unreliable(conn, ECOMM);
2150 if (skb->len > conn->rx_len) {
2151 BT_ERR("Fragment is too long (len %d, expected %d)",
2152 skb->len, conn->rx_len);
2153 kfree_skb(conn->rx_skb);
2154 conn->rx_skb = NULL;
2156 l2cap_conn_unreliable(conn, ECOMM);
2160 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2162 conn->rx_len -= skb->len;
2164 if (!conn->rx_len) {
2165 /* Complete frame received */
2166 l2cap_recv_frame(conn, conn->rx_skb);
2167 conn->rx_skb = NULL;
2176 static ssize_t l2cap_sysfs_show(struct class *dev, char *buf)
2179 struct hlist_node *node;
2182 read_lock_bh(&l2cap_sk_list.lock);
2184 sk_for_each(sk, node, &l2cap_sk_list.head) {
2185 struct l2cap_pinfo *pi = l2cap_pi(sk);
2187 str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d 0x%x\n",
2188 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
2189 sk->sk_state, btohs(pi->psm), pi->scid, pi->dcid,
2190 pi->imtu, pi->omtu, pi->link_mode);
2193 read_unlock_bh(&l2cap_sk_list.lock);
2198 static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
2200 static const struct proto_ops l2cap_sock_ops = {
2201 .family = PF_BLUETOOTH,
2202 .owner = THIS_MODULE,
2203 .release = l2cap_sock_release,
2204 .bind = l2cap_sock_bind,
2205 .connect = l2cap_sock_connect,
2206 .listen = l2cap_sock_listen,
2207 .accept = l2cap_sock_accept,
2208 .getname = l2cap_sock_getname,
2209 .sendmsg = l2cap_sock_sendmsg,
2210 .recvmsg = bt_sock_recvmsg,
2211 .poll = bt_sock_poll,
2212 .mmap = sock_no_mmap,
2213 .socketpair = sock_no_socketpair,
2214 .ioctl = sock_no_ioctl,
2215 .shutdown = l2cap_sock_shutdown,
2216 .setsockopt = l2cap_sock_setsockopt,
2217 .getsockopt = l2cap_sock_getsockopt
2220 static struct net_proto_family l2cap_sock_family_ops = {
2221 .family = PF_BLUETOOTH,
2222 .owner = THIS_MODULE,
2223 .create = l2cap_sock_create,
2226 static struct hci_proto l2cap_hci_proto = {
2228 .id = HCI_PROTO_L2CAP,
2229 .connect_ind = l2cap_connect_ind,
2230 .connect_cfm = l2cap_connect_cfm,
2231 .disconn_ind = l2cap_disconn_ind,
2232 .auth_cfm = l2cap_auth_cfm,
2233 .encrypt_cfm = l2cap_encrypt_cfm,
2234 .recv_acldata = l2cap_recv_acldata
2237 static int __init l2cap_init(void)
2241 err = proto_register(&l2cap_proto, 0);
2245 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
2247 BT_ERR("L2CAP socket registration failed");
2251 err = hci_register_proto(&l2cap_hci_proto);
2253 BT_ERR("L2CAP protocol registration failed");
2254 bt_sock_unregister(BTPROTO_L2CAP);
2258 if (class_create_file(bt_class, &class_attr_l2cap) < 0)
2259 BT_ERR("Failed to create L2CAP info file");
2261 BT_INFO("L2CAP ver %s", VERSION);
2262 BT_INFO("L2CAP socket layer initialized");
2267 proto_unregister(&l2cap_proto);
2271 static void __exit l2cap_exit(void)
2273 class_remove_file(bt_class, &class_attr_l2cap);
2275 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
2276 BT_ERR("L2CAP socket unregistration failed");
2278 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
2279 BT_ERR("L2CAP protocol unregistration failed");
2281 proto_unregister(&l2cap_proto);
2284 void l2cap_load(void)
2286 /* Dummy function to trigger automatic L2CAP module loading by
2287 * other modules that use L2CAP sockets but don't use any other
2288 * symbols from it. */
2291 EXPORT_SYMBOL(l2cap_load);
2293 module_init(l2cap_init);
2294 module_exit(l2cap_exit);
2296 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
2297 MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
2298 MODULE_VERSION(VERSION);
2299 MODULE_LICENSE("GPL");
2300 MODULE_ALIAS("bt-proto-0");