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(u16 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, u16 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, u16 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 socket *sock, int proto, gfp_t prio)
525 sk = sk_alloc(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 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(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 > 0 && 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(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, (u16 *) 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(*((u16 *)opt->val));
1263 *val = __le32_to_cpu(*((u32 *)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 *((u16 *) opt->val) = cpu_to_le16(val);
1294 *((u32 *) 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;
1376 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
1379 rsp->scid = cpu_to_le16(pi->dcid);
1380 rsp->result = cpu_to_le16(result);
1381 rsp->flags = cpu_to_le16(0x0000);
1386 static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1388 struct l2cap_conf_rsp *rsp = data;
1389 void *ptr = rsp->data;
1391 BT_DBG("sk %p", sk);
1393 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1394 rsp->result = cpu_to_le16(result);
1395 rsp->flags = cpu_to_le16(flags);
1400 static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1402 struct l2cap_chan_list *list = &conn->chan_list;
1403 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
1404 struct l2cap_conn_rsp rsp;
1405 struct sock *sk, *parent;
1406 int result = 0, status = 0;
1408 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
1411 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
1413 /* Check if we have socket listening on psm */
1414 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
1416 result = L2CAP_CR_BAD_PSM;
1420 result = L2CAP_CR_NO_MEM;
1422 /* Check for backlog size */
1423 if (sk_acceptq_is_full(parent)) {
1424 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1428 sk = l2cap_sock_alloc(NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1432 write_lock_bh(&list->lock);
1434 /* Check if we already have channel with that dcid */
1435 if (__l2cap_get_chan_by_dcid(list, scid)) {
1436 write_unlock_bh(&list->lock);
1437 sock_set_flag(sk, SOCK_ZAPPED);
1438 l2cap_sock_kill(sk);
1442 hci_conn_hold(conn->hcon);
1444 l2cap_sock_init(sk, parent);
1445 bacpy(&bt_sk(sk)->src, conn->src);
1446 bacpy(&bt_sk(sk)->dst, conn->dst);
1447 l2cap_pi(sk)->psm = psm;
1448 l2cap_pi(sk)->dcid = scid;
1450 __l2cap_chan_add(conn, sk, parent);
1451 dcid = l2cap_pi(sk)->scid;
1453 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
1455 /* Service level security */
1456 result = L2CAP_CR_PEND;
1457 status = L2CAP_CS_AUTHEN_PEND;
1458 sk->sk_state = BT_CONNECT2;
1459 l2cap_pi(sk)->ident = cmd->ident;
1461 if ((l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) ||
1462 (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) {
1463 if (!hci_conn_encrypt(conn->hcon))
1465 } else if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH) {
1466 if (!hci_conn_auth(conn->hcon))
1470 sk->sk_state = BT_CONFIG;
1471 result = status = 0;
1474 write_unlock_bh(&list->lock);
1477 bh_unlock_sock(parent);
1480 rsp.scid = cpu_to_le16(scid);
1481 rsp.dcid = cpu_to_le16(dcid);
1482 rsp.result = cpu_to_le16(result);
1483 rsp.status = cpu_to_le16(status);
1484 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1488 static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1490 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
1491 u16 scid, dcid, result, status;
1495 scid = __le16_to_cpu(rsp->scid);
1496 dcid = __le16_to_cpu(rsp->dcid);
1497 result = __le16_to_cpu(rsp->result);
1498 status = __le16_to_cpu(rsp->status);
1500 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
1503 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1506 if (!(sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident)))
1511 case L2CAP_CR_SUCCESS:
1512 sk->sk_state = BT_CONFIG;
1513 l2cap_pi(sk)->ident = 0;
1514 l2cap_pi(sk)->dcid = dcid;
1515 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
1517 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1518 l2cap_build_conf_req(sk, req), req);
1525 l2cap_chan_del(sk, ECONNREFUSED);
1533 static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1535 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
1541 dcid = __le16_to_cpu(req->dcid);
1542 flags = __le16_to_cpu(req->flags);
1544 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
1546 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
1549 if (sk->sk_state == BT_DISCONN)
1552 /* Reject if config buffer is too small. */
1553 len = cmd->len - sizeof(*req);
1554 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
1555 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
1556 l2cap_build_conf_rsp(sk, rsp,
1557 L2CAP_CONF_REJECT, flags), rsp);
1562 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
1563 l2cap_pi(sk)->conf_len += len;
1565 if (flags & 0x0001) {
1566 /* Incomplete config. Send empty response. */
1567 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
1568 l2cap_build_conf_rsp(sk, rsp,
1569 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1573 /* Complete config. */
1574 len = l2cap_parse_conf_req(sk, rsp);
1578 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
1580 /* Output config done. */
1581 l2cap_pi(sk)->conf_state |= L2CAP_CONF_OUTPUT_DONE;
1583 /* Reset config buffer. */
1584 l2cap_pi(sk)->conf_len = 0;
1586 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
1587 sk->sk_state = BT_CONNECTED;
1588 l2cap_chan_ready(sk);
1589 } else if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
1591 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1592 l2cap_build_conf_req(sk, req), req);
1600 static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1602 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
1603 u16 scid, flags, result;
1606 scid = __le16_to_cpu(rsp->scid);
1607 flags = __le16_to_cpu(rsp->flags);
1608 result = __le16_to_cpu(rsp->result);
1610 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", scid, flags, result);
1612 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1616 case L2CAP_CONF_SUCCESS:
1619 case L2CAP_CONF_UNACCEPT:
1620 if (++l2cap_pi(sk)->conf_retry < L2CAP_CONF_MAX_RETRIES) {
1622 /* It does not make sense to adjust L2CAP parameters
1623 * that are currently defined in the spec. We simply
1624 * resend config request that we sent earlier. It is
1625 * stupid, but it helps qualification testing which
1626 * expects at least some response from us. */
1627 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1628 l2cap_build_conf_req(sk, req), req);
1633 sk->sk_state = BT_DISCONN;
1634 sk->sk_err = ECONNRESET;
1635 l2cap_sock_set_timer(sk, HZ * 5);
1637 struct l2cap_disconn_req req;
1638 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
1639 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
1640 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1641 L2CAP_DISCONN_REQ, sizeof(req), &req);
1649 /* Input config done */
1650 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
1652 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
1653 sk->sk_state = BT_CONNECTED;
1654 l2cap_chan_ready(sk);
1662 static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1664 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
1665 struct l2cap_disconn_rsp rsp;
1669 scid = __le16_to_cpu(req->scid);
1670 dcid = __le16_to_cpu(req->dcid);
1672 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
1674 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
1677 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1678 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1679 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
1681 sk->sk_shutdown = SHUTDOWN_MASK;
1683 l2cap_chan_del(sk, ECONNRESET);
1686 l2cap_sock_kill(sk);
1690 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1692 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
1696 scid = __le16_to_cpu(rsp->scid);
1697 dcid = __le16_to_cpu(rsp->dcid);
1699 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
1701 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1704 l2cap_chan_del(sk, 0);
1707 l2cap_sock_kill(sk);
1711 static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1713 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1714 struct l2cap_info_rsp rsp;
1717 type = __le16_to_cpu(req->type);
1719 BT_DBG("type 0x%4.4x", type);
1721 rsp.type = cpu_to_le16(type);
1722 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
1723 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), &rsp);
1728 static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1730 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
1733 type = __le16_to_cpu(rsp->type);
1734 result = __le16_to_cpu(rsp->result);
1736 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
1741 static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
1743 u8 *data = skb->data;
1745 struct l2cap_cmd_hdr cmd;
1748 l2cap_raw_recv(conn, skb);
1750 while (len >= L2CAP_CMD_HDR_SIZE) {
1751 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
1752 data += L2CAP_CMD_HDR_SIZE;
1753 len -= L2CAP_CMD_HDR_SIZE;
1755 cmd.len = __le16_to_cpu(cmd.len);
1757 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd.len, cmd.ident);
1759 if (cmd.len > len || !cmd.ident) {
1760 BT_DBG("corrupted command");
1765 case L2CAP_COMMAND_REJ:
1766 /* FIXME: We should process this */
1769 case L2CAP_CONN_REQ:
1770 err = l2cap_connect_req(conn, &cmd, data);
1773 case L2CAP_CONN_RSP:
1774 err = l2cap_connect_rsp(conn, &cmd, data);
1777 case L2CAP_CONF_REQ:
1778 err = l2cap_config_req(conn, &cmd, data);
1781 case L2CAP_CONF_RSP:
1782 err = l2cap_config_rsp(conn, &cmd, data);
1785 case L2CAP_DISCONN_REQ:
1786 err = l2cap_disconnect_req(conn, &cmd, data);
1789 case L2CAP_DISCONN_RSP:
1790 err = l2cap_disconnect_rsp(conn, &cmd, data);
1793 case L2CAP_ECHO_REQ:
1794 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd.len, data);
1797 case L2CAP_ECHO_RSP:
1800 case L2CAP_INFO_REQ:
1801 err = l2cap_information_req(conn, &cmd, data);
1804 case L2CAP_INFO_RSP:
1805 err = l2cap_information_rsp(conn, &cmd, data);
1809 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
1815 struct l2cap_cmd_rej rej;
1816 BT_DBG("error %d", err);
1818 /* FIXME: Map err to a valid reason */
1819 rej.reason = cpu_to_le16(0);
1820 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
1830 static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
1834 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
1836 BT_DBG("unknown cid 0x%4.4x", cid);
1840 BT_DBG("sk %p, len %d", sk, skb->len);
1842 if (sk->sk_state != BT_CONNECTED)
1845 if (l2cap_pi(sk)->imtu < skb->len)
1848 /* If socket recv buffers overflows we drop data here
1849 * which is *bad* because L2CAP has to be reliable.
1850 * But we don't have any other choice. L2CAP doesn't
1851 * provide flow control mechanism. */
1853 if (!sock_queue_rcv_skb(sk, skb))
1866 static inline int l2cap_conless_channel(struct l2cap_conn *conn, u16 psm, struct sk_buff *skb)
1870 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
1874 BT_DBG("sk %p, len %d", sk, skb->len);
1876 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
1879 if (l2cap_pi(sk)->imtu < skb->len)
1882 if (!sock_queue_rcv_skb(sk, skb))
1889 if (sk) bh_unlock_sock(sk);
1893 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
1895 struct l2cap_hdr *lh = (void *) skb->data;
1898 skb_pull(skb, L2CAP_HDR_SIZE);
1899 cid = __le16_to_cpu(lh->cid);
1900 len = __le16_to_cpu(lh->len);
1902 BT_DBG("len %d, cid 0x%4.4x", len, cid);
1906 l2cap_sig_channel(conn, skb);
1910 psm = get_unaligned((u16 *) skb->data);
1912 l2cap_conless_channel(conn, psm, skb);
1916 l2cap_data_channel(conn, cid, skb);
1921 /* ---- L2CAP interface with lower layer (HCI) ---- */
1923 static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
1925 int exact = 0, lm1 = 0, lm2 = 0;
1926 register struct sock *sk;
1927 struct hlist_node *node;
1929 if (type != ACL_LINK)
1932 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
1934 /* Find listening sockets and check their link_mode */
1935 read_lock(&l2cap_sk_list.lock);
1936 sk_for_each(sk, node, &l2cap_sk_list.head) {
1937 if (sk->sk_state != BT_LISTEN)
1940 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
1941 lm1 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
1943 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
1944 lm2 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
1946 read_unlock(&l2cap_sk_list.lock);
1948 return exact ? lm1 : lm2;
1951 static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1953 struct l2cap_conn *conn;
1955 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
1957 if (hcon->type != ACL_LINK)
1961 conn = l2cap_conn_add(hcon, status);
1963 l2cap_conn_ready(conn);
1965 l2cap_conn_del(hcon, bt_err(status));
1970 static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason)
1972 BT_DBG("hcon %p reason %d", hcon, reason);
1974 if (hcon->type != ACL_LINK)
1977 l2cap_conn_del(hcon, bt_err(reason));
1982 static int l2cap_auth_cfm(struct hci_conn *hcon, u8 status)
1984 struct l2cap_chan_list *l;
1985 struct l2cap_conn *conn = conn = hcon->l2cap_data;
1986 struct l2cap_conn_rsp rsp;
1993 l = &conn->chan_list;
1995 BT_DBG("conn %p", conn);
1997 read_lock(&l->lock);
1999 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2002 if (sk->sk_state != BT_CONNECT2 ||
2003 (l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) ||
2004 (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) {
2010 sk->sk_state = BT_CONFIG;
2013 sk->sk_state = BT_DISCONN;
2014 l2cap_sock_set_timer(sk, HZ/10);
2015 result = L2CAP_CR_SEC_BLOCK;
2018 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
2019 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
2020 rsp.result = cpu_to_le16(result);
2021 rsp.status = cpu_to_le16(0);
2022 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
2023 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2028 read_unlock(&l->lock);
2032 static int l2cap_encrypt_cfm(struct hci_conn *hcon, u8 status)
2034 struct l2cap_chan_list *l;
2035 struct l2cap_conn *conn = hcon->l2cap_data;
2036 struct l2cap_conn_rsp rsp;
2043 l = &conn->chan_list;
2045 BT_DBG("conn %p", conn);
2047 read_lock(&l->lock);
2049 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2052 if (sk->sk_state != BT_CONNECT2) {
2058 sk->sk_state = BT_CONFIG;
2061 sk->sk_state = BT_DISCONN;
2062 l2cap_sock_set_timer(sk, HZ/10);
2063 result = L2CAP_CR_SEC_BLOCK;
2066 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
2067 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
2068 rsp.result = cpu_to_le16(result);
2069 rsp.status = cpu_to_le16(0);
2070 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
2071 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2073 if (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)
2074 hci_conn_change_link_key(hcon);
2079 read_unlock(&l->lock);
2083 static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
2085 struct l2cap_conn *conn = hcon->l2cap_data;
2087 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
2090 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
2092 if (flags & ACL_START) {
2093 struct l2cap_hdr *hdr;
2097 BT_ERR("Unexpected start frame (len %d)", skb->len);
2098 kfree_skb(conn->rx_skb);
2099 conn->rx_skb = NULL;
2101 l2cap_conn_unreliable(conn, ECOMM);
2105 BT_ERR("Frame is too short (len %d)", skb->len);
2106 l2cap_conn_unreliable(conn, ECOMM);
2110 hdr = (struct l2cap_hdr *) skb->data;
2111 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
2113 if (len == skb->len) {
2114 /* Complete frame received */
2115 l2cap_recv_frame(conn, skb);
2119 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
2121 if (skb->len > len) {
2122 BT_ERR("Frame is too long (len %d, expected len %d)",
2124 l2cap_conn_unreliable(conn, ECOMM);
2128 /* Allocate skb for the complete frame (with header) */
2129 if (!(conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC)))
2132 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2134 conn->rx_len = len - skb->len;
2136 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
2138 if (!conn->rx_len) {
2139 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
2140 l2cap_conn_unreliable(conn, ECOMM);
2144 if (skb->len > conn->rx_len) {
2145 BT_ERR("Fragment is too long (len %d, expected %d)",
2146 skb->len, conn->rx_len);
2147 kfree_skb(conn->rx_skb);
2148 conn->rx_skb = NULL;
2150 l2cap_conn_unreliable(conn, ECOMM);
2154 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2156 conn->rx_len -= skb->len;
2158 if (!conn->rx_len) {
2159 /* Complete frame received */
2160 l2cap_recv_frame(conn, conn->rx_skb);
2161 conn->rx_skb = NULL;
2170 static ssize_t l2cap_sysfs_show(struct class *dev, char *buf)
2173 struct hlist_node *node;
2176 read_lock_bh(&l2cap_sk_list.lock);
2178 sk_for_each(sk, node, &l2cap_sk_list.head) {
2179 struct l2cap_pinfo *pi = l2cap_pi(sk);
2181 str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d 0x%x\n",
2182 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
2183 sk->sk_state, btohs(pi->psm), pi->scid, pi->dcid,
2184 pi->imtu, pi->omtu, pi->link_mode);
2187 read_unlock_bh(&l2cap_sk_list.lock);
2192 static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
2194 static const struct proto_ops l2cap_sock_ops = {
2195 .family = PF_BLUETOOTH,
2196 .owner = THIS_MODULE,
2197 .release = l2cap_sock_release,
2198 .bind = l2cap_sock_bind,
2199 .connect = l2cap_sock_connect,
2200 .listen = l2cap_sock_listen,
2201 .accept = l2cap_sock_accept,
2202 .getname = l2cap_sock_getname,
2203 .sendmsg = l2cap_sock_sendmsg,
2204 .recvmsg = bt_sock_recvmsg,
2205 .poll = bt_sock_poll,
2206 .mmap = sock_no_mmap,
2207 .socketpair = sock_no_socketpair,
2208 .ioctl = sock_no_ioctl,
2209 .shutdown = l2cap_sock_shutdown,
2210 .setsockopt = l2cap_sock_setsockopt,
2211 .getsockopt = l2cap_sock_getsockopt
2214 static struct net_proto_family l2cap_sock_family_ops = {
2215 .family = PF_BLUETOOTH,
2216 .owner = THIS_MODULE,
2217 .create = l2cap_sock_create,
2220 static struct hci_proto l2cap_hci_proto = {
2222 .id = HCI_PROTO_L2CAP,
2223 .connect_ind = l2cap_connect_ind,
2224 .connect_cfm = l2cap_connect_cfm,
2225 .disconn_ind = l2cap_disconn_ind,
2226 .auth_cfm = l2cap_auth_cfm,
2227 .encrypt_cfm = l2cap_encrypt_cfm,
2228 .recv_acldata = l2cap_recv_acldata
2231 static int __init l2cap_init(void)
2235 err = proto_register(&l2cap_proto, 0);
2239 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
2241 BT_ERR("L2CAP socket registration failed");
2245 err = hci_register_proto(&l2cap_hci_proto);
2247 BT_ERR("L2CAP protocol registration failed");
2248 bt_sock_unregister(BTPROTO_L2CAP);
2252 if (class_create_file(bt_class, &class_attr_l2cap) < 0)
2253 BT_ERR("Failed to create L2CAP info file");
2255 BT_INFO("L2CAP ver %s", VERSION);
2256 BT_INFO("L2CAP socket layer initialized");
2261 proto_unregister(&l2cap_proto);
2265 static void __exit l2cap_exit(void)
2267 class_remove_file(bt_class, &class_attr_l2cap);
2269 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
2270 BT_ERR("L2CAP socket unregistration failed");
2272 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
2273 BT_ERR("L2CAP protocol unregistration failed");
2275 proto_unregister(&l2cap_proto);
2278 void l2cap_load(void)
2280 /* Dummy function to trigger automatic L2CAP module loading by
2281 * other modules that use L2CAP sockets but don't use any other
2282 * symbols from it. */
2285 EXPORT_SYMBOL(l2cap_load);
2287 module_init(l2cap_init);
2288 module_exit(l2cap_exit);
2290 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
2291 MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
2292 MODULE_VERSION(VERSION);
2293 MODULE_LICENSE("GPL");
2294 MODULE_ALIAS("bt-proto-0");