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>
43 #include <linux/debugfs.h>
44 #include <linux/seq_file.h>
45 #include <linux/uaccess.h>
46 #include <linux/crc16.h>
49 #include <asm/system.h>
50 #include <asm/unaligned.h>
52 #include <net/bluetooth/bluetooth.h>
53 #include <net/bluetooth/hci_core.h>
54 #include <net/bluetooth/l2cap.h>
56 #define VERSION "2.14"
58 static int enable_ertm = 0;
59 static int max_transmit = L2CAP_DEFAULT_MAX_TX;
61 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
62 static u8 l2cap_fixed_chan[8] = { 0x02, };
64 static const struct proto_ops l2cap_sock_ops;
66 static struct bt_sock_list l2cap_sk_list = {
67 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
70 static void __l2cap_sock_close(struct sock *sk, int reason);
71 static void l2cap_sock_close(struct sock *sk);
72 static void l2cap_sock_kill(struct sock *sk);
74 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
75 u8 code, u8 ident, u16 dlen, void *data);
77 /* ---- L2CAP timers ---- */
78 static void l2cap_sock_timeout(unsigned long arg)
80 struct sock *sk = (struct sock *) arg;
83 BT_DBG("sock %p state %d", sk, sk->sk_state);
87 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
88 reason = ECONNREFUSED;
89 else if (sk->sk_state == BT_CONNECT &&
90 l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
91 reason = ECONNREFUSED;
95 __l2cap_sock_close(sk, reason);
103 static void l2cap_sock_set_timer(struct sock *sk, long timeout)
105 BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
106 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
109 static void l2cap_sock_clear_timer(struct sock *sk)
111 BT_DBG("sock %p state %d", sk, sk->sk_state);
112 sk_stop_timer(sk, &sk->sk_timer);
115 /* ---- L2CAP channels ---- */
116 static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
119 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
120 if (l2cap_pi(s)->dcid == cid)
126 static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
129 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
130 if (l2cap_pi(s)->scid == cid)
136 /* Find channel with given SCID.
137 * Returns locked socket */
138 static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
142 s = __l2cap_get_chan_by_scid(l, cid);
145 read_unlock(&l->lock);
149 static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
152 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
153 if (l2cap_pi(s)->ident == ident)
159 static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
163 s = __l2cap_get_chan_by_ident(l, ident);
166 read_unlock(&l->lock);
170 static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
172 u16 cid = L2CAP_CID_DYN_START;
174 for (; cid < L2CAP_CID_DYN_END; cid++) {
175 if (!__l2cap_get_chan_by_scid(l, cid))
182 static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
187 l2cap_pi(l->head)->prev_c = sk;
189 l2cap_pi(sk)->next_c = l->head;
190 l2cap_pi(sk)->prev_c = NULL;
194 static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
196 struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
198 write_lock_bh(&l->lock);
203 l2cap_pi(next)->prev_c = prev;
205 l2cap_pi(prev)->next_c = next;
206 write_unlock_bh(&l->lock);
211 static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
213 struct l2cap_chan_list *l = &conn->chan_list;
215 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
216 l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
218 conn->disc_reason = 0x13;
220 l2cap_pi(sk)->conn = conn;
222 if (sk->sk_type == SOCK_SEQPACKET) {
223 /* Alloc CID for connection-oriented socket */
224 l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
225 } else if (sk->sk_type == SOCK_DGRAM) {
226 /* Connectionless socket */
227 l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
228 l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
229 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
231 /* Raw socket can send/recv signalling messages only */
232 l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
233 l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
234 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
237 __l2cap_chan_link(l, sk);
240 bt_accept_enqueue(parent, sk);
244 * Must be called on the locked socket. */
245 static void l2cap_chan_del(struct sock *sk, int err)
247 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
248 struct sock *parent = bt_sk(sk)->parent;
250 l2cap_sock_clear_timer(sk);
252 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
255 /* Unlink from channel list */
256 l2cap_chan_unlink(&conn->chan_list, sk);
257 l2cap_pi(sk)->conn = NULL;
258 hci_conn_put(conn->hcon);
261 sk->sk_state = BT_CLOSED;
262 sock_set_flag(sk, SOCK_ZAPPED);
268 bt_accept_unlink(sk);
269 parent->sk_data_ready(parent, 0);
271 sk->sk_state_change(sk);
274 /* Service level security */
275 static inline int l2cap_check_security(struct sock *sk)
277 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
280 if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
281 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
282 auth_type = HCI_AT_NO_BONDING_MITM;
284 auth_type = HCI_AT_NO_BONDING;
286 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
287 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
289 switch (l2cap_pi(sk)->sec_level) {
290 case BT_SECURITY_HIGH:
291 auth_type = HCI_AT_GENERAL_BONDING_MITM;
293 case BT_SECURITY_MEDIUM:
294 auth_type = HCI_AT_GENERAL_BONDING;
297 auth_type = HCI_AT_NO_BONDING;
302 return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
306 static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
310 /* Get next available identificator.
311 * 1 - 128 are used by kernel.
312 * 129 - 199 are reserved.
313 * 200 - 254 are used by utilities like l2ping, etc.
316 spin_lock_bh(&conn->lock);
318 if (++conn->tx_ident > 128)
323 spin_unlock_bh(&conn->lock);
328 static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
330 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
332 BT_DBG("code 0x%2.2x", code);
337 return hci_send_acl(conn->hcon, skb, 0);
340 static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
343 struct l2cap_hdr *lh;
344 struct l2cap_conn *conn = pi->conn;
345 int count, hlen = L2CAP_HDR_SIZE + 2;
347 if (pi->fcs == L2CAP_FCS_CRC16)
350 BT_DBG("pi %p, control 0x%2.2x", pi, control);
352 count = min_t(unsigned int, conn->mtu, hlen);
353 control |= L2CAP_CTRL_FRAME_TYPE;
355 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
356 control |= L2CAP_CTRL_FINAL;
357 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
360 if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
361 control |= L2CAP_CTRL_POLL;
362 pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
365 skb = bt_skb_alloc(count, GFP_ATOMIC);
369 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
370 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
371 lh->cid = cpu_to_le16(pi->dcid);
372 put_unaligned_le16(control, skb_put(skb, 2));
374 if (pi->fcs == L2CAP_FCS_CRC16) {
375 u16 fcs = crc16(0, (u8 *)lh, count - 2);
376 put_unaligned_le16(fcs, skb_put(skb, 2));
379 return hci_send_acl(pi->conn->hcon, skb, 0);
382 static inline int l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
384 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY)
385 control |= L2CAP_SUPER_RCV_NOT_READY;
387 control |= L2CAP_SUPER_RCV_READY;
389 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
391 return l2cap_send_sframe(pi, control);
394 static void l2cap_do_start(struct sock *sk)
396 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
398 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
399 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
402 if (l2cap_check_security(sk)) {
403 struct l2cap_conn_req req;
404 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
405 req.psm = l2cap_pi(sk)->psm;
407 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
409 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
410 L2CAP_CONN_REQ, sizeof(req), &req);
413 struct l2cap_info_req req;
414 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
416 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
417 conn->info_ident = l2cap_get_ident(conn);
419 mod_timer(&conn->info_timer, jiffies +
420 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
422 l2cap_send_cmd(conn, conn->info_ident,
423 L2CAP_INFO_REQ, sizeof(req), &req);
427 static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk)
429 struct l2cap_disconn_req req;
431 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
432 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
433 l2cap_send_cmd(conn, l2cap_get_ident(conn),
434 L2CAP_DISCONN_REQ, sizeof(req), &req);
437 /* ---- L2CAP connections ---- */
438 static void l2cap_conn_start(struct l2cap_conn *conn)
440 struct l2cap_chan_list *l = &conn->chan_list;
443 BT_DBG("conn %p", conn);
447 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
450 if (sk->sk_type != SOCK_SEQPACKET) {
455 if (sk->sk_state == BT_CONNECT) {
456 if (l2cap_check_security(sk)) {
457 struct l2cap_conn_req req;
458 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
459 req.psm = l2cap_pi(sk)->psm;
461 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
463 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
464 L2CAP_CONN_REQ, sizeof(req), &req);
466 } else if (sk->sk_state == BT_CONNECT2) {
467 struct l2cap_conn_rsp rsp;
468 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
469 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
471 if (l2cap_check_security(sk)) {
472 if (bt_sk(sk)->defer_setup) {
473 struct sock *parent = bt_sk(sk)->parent;
474 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
475 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
476 parent->sk_data_ready(parent, 0);
479 sk->sk_state = BT_CONFIG;
480 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
481 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
484 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
485 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
488 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
489 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
495 read_unlock(&l->lock);
498 static void l2cap_conn_ready(struct l2cap_conn *conn)
500 struct l2cap_chan_list *l = &conn->chan_list;
503 BT_DBG("conn %p", conn);
507 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
510 if (sk->sk_type != SOCK_SEQPACKET) {
511 l2cap_sock_clear_timer(sk);
512 sk->sk_state = BT_CONNECTED;
513 sk->sk_state_change(sk);
514 } else if (sk->sk_state == BT_CONNECT)
520 read_unlock(&l->lock);
523 /* Notify sockets that we cannot guaranty reliability anymore */
524 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
526 struct l2cap_chan_list *l = &conn->chan_list;
529 BT_DBG("conn %p", conn);
533 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
534 if (l2cap_pi(sk)->force_reliable)
538 read_unlock(&l->lock);
541 static void l2cap_info_timeout(unsigned long arg)
543 struct l2cap_conn *conn = (void *) arg;
545 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
546 conn->info_ident = 0;
548 l2cap_conn_start(conn);
551 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
553 struct l2cap_conn *conn = hcon->l2cap_data;
558 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
562 hcon->l2cap_data = conn;
565 BT_DBG("hcon %p conn %p", hcon, conn);
567 conn->mtu = hcon->hdev->acl_mtu;
568 conn->src = &hcon->hdev->bdaddr;
569 conn->dst = &hcon->dst;
573 spin_lock_init(&conn->lock);
574 rwlock_init(&conn->chan_list.lock);
576 setup_timer(&conn->info_timer, l2cap_info_timeout,
577 (unsigned long) conn);
579 conn->disc_reason = 0x13;
584 static void l2cap_conn_del(struct hci_conn *hcon, int err)
586 struct l2cap_conn *conn = hcon->l2cap_data;
592 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
594 kfree_skb(conn->rx_skb);
597 while ((sk = conn->chan_list.head)) {
599 l2cap_chan_del(sk, err);
604 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
605 del_timer_sync(&conn->info_timer);
607 hcon->l2cap_data = NULL;
611 static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
613 struct l2cap_chan_list *l = &conn->chan_list;
614 write_lock_bh(&l->lock);
615 __l2cap_chan_add(conn, sk, parent);
616 write_unlock_bh(&l->lock);
619 /* ---- Socket interface ---- */
620 static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
623 struct hlist_node *node;
624 sk_for_each(sk, node, &l2cap_sk_list.head)
625 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
632 /* Find socket with psm and source bdaddr.
633 * Returns closest match.
635 static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
637 struct sock *sk = NULL, *sk1 = NULL;
638 struct hlist_node *node;
640 sk_for_each(sk, node, &l2cap_sk_list.head) {
641 if (state && sk->sk_state != state)
644 if (l2cap_pi(sk)->psm == psm) {
646 if (!bacmp(&bt_sk(sk)->src, src))
650 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
654 return node ? sk : sk1;
657 /* Find socket with given address (psm, src).
658 * Returns locked socket */
659 static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
662 read_lock(&l2cap_sk_list.lock);
663 s = __l2cap_get_sock_by_psm(state, psm, src);
666 read_unlock(&l2cap_sk_list.lock);
670 static void l2cap_sock_destruct(struct sock *sk)
674 skb_queue_purge(&sk->sk_receive_queue);
675 skb_queue_purge(&sk->sk_write_queue);
678 static void l2cap_sock_cleanup_listen(struct sock *parent)
682 BT_DBG("parent %p", parent);
684 /* Close not yet accepted channels */
685 while ((sk = bt_accept_dequeue(parent, NULL)))
686 l2cap_sock_close(sk);
688 parent->sk_state = BT_CLOSED;
689 sock_set_flag(parent, SOCK_ZAPPED);
692 /* Kill socket (only if zapped and orphan)
693 * Must be called on unlocked socket.
695 static void l2cap_sock_kill(struct sock *sk)
697 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
700 BT_DBG("sk %p state %d", sk, sk->sk_state);
702 /* Kill poor orphan */
703 bt_sock_unlink(&l2cap_sk_list, sk);
704 sock_set_flag(sk, SOCK_DEAD);
708 static void __l2cap_sock_close(struct sock *sk, int reason)
710 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
712 switch (sk->sk_state) {
714 l2cap_sock_cleanup_listen(sk);
719 if (sk->sk_type == SOCK_SEQPACKET) {
720 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
722 sk->sk_state = BT_DISCONN;
723 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
724 l2cap_send_disconn_req(conn, sk);
726 l2cap_chan_del(sk, reason);
730 if (sk->sk_type == SOCK_SEQPACKET) {
731 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
732 struct l2cap_conn_rsp rsp;
735 if (bt_sk(sk)->defer_setup)
736 result = L2CAP_CR_SEC_BLOCK;
738 result = L2CAP_CR_BAD_PSM;
740 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
741 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
742 rsp.result = cpu_to_le16(result);
743 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
744 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
745 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
747 l2cap_chan_del(sk, reason);
752 l2cap_chan_del(sk, reason);
756 sock_set_flag(sk, SOCK_ZAPPED);
761 /* Must be called on unlocked socket. */
762 static void l2cap_sock_close(struct sock *sk)
764 l2cap_sock_clear_timer(sk);
766 __l2cap_sock_close(sk, ECONNRESET);
771 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
773 struct l2cap_pinfo *pi = l2cap_pi(sk);
778 sk->sk_type = parent->sk_type;
779 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
781 pi->imtu = l2cap_pi(parent)->imtu;
782 pi->omtu = l2cap_pi(parent)->omtu;
783 pi->mode = l2cap_pi(parent)->mode;
784 pi->fcs = l2cap_pi(parent)->fcs;
785 pi->sec_level = l2cap_pi(parent)->sec_level;
786 pi->role_switch = l2cap_pi(parent)->role_switch;
787 pi->force_reliable = l2cap_pi(parent)->force_reliable;
789 pi->imtu = L2CAP_DEFAULT_MTU;
791 pi->mode = L2CAP_MODE_BASIC;
792 pi->fcs = L2CAP_FCS_CRC16;
793 pi->sec_level = BT_SECURITY_LOW;
795 pi->force_reliable = 0;
798 /* Default config options */
800 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
801 skb_queue_head_init(TX_QUEUE(sk));
802 skb_queue_head_init(SREJ_QUEUE(sk));
803 INIT_LIST_HEAD(SREJ_LIST(sk));
806 static struct proto l2cap_proto = {
808 .owner = THIS_MODULE,
809 .obj_size = sizeof(struct l2cap_pinfo)
812 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
816 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
820 sock_init_data(sock, sk);
821 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
823 sk->sk_destruct = l2cap_sock_destruct;
824 sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
826 sock_reset_flag(sk, SOCK_ZAPPED);
828 sk->sk_protocol = proto;
829 sk->sk_state = BT_OPEN;
831 setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
833 bt_sock_link(&l2cap_sk_list, sk);
837 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
842 BT_DBG("sock %p", sock);
844 sock->state = SS_UNCONNECTED;
846 if (sock->type != SOCK_SEQPACKET &&
847 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
848 return -ESOCKTNOSUPPORT;
850 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
853 sock->ops = &l2cap_sock_ops;
855 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
859 l2cap_sock_init(sk, NULL);
863 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
865 struct sock *sk = sock->sk;
866 struct sockaddr_l2 la;
871 if (!addr || addr->sa_family != AF_BLUETOOTH)
874 memset(&la, 0, sizeof(la));
875 len = min_t(unsigned int, sizeof(la), alen);
876 memcpy(&la, addr, len);
883 if (sk->sk_state != BT_OPEN) {
888 if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 &&
889 !capable(CAP_NET_BIND_SERVICE)) {
894 write_lock_bh(&l2cap_sk_list.lock);
896 if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
899 /* Save source address */
900 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
901 l2cap_pi(sk)->psm = la.l2_psm;
902 l2cap_pi(sk)->sport = la.l2_psm;
903 sk->sk_state = BT_BOUND;
905 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
906 __le16_to_cpu(la.l2_psm) == 0x0003)
907 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
910 write_unlock_bh(&l2cap_sk_list.lock);
917 static int l2cap_do_connect(struct sock *sk)
919 bdaddr_t *src = &bt_sk(sk)->src;
920 bdaddr_t *dst = &bt_sk(sk)->dst;
921 struct l2cap_conn *conn;
922 struct hci_conn *hcon;
923 struct hci_dev *hdev;
927 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
930 hdev = hci_get_route(dst, src);
932 return -EHOSTUNREACH;
934 hci_dev_lock_bh(hdev);
938 if (sk->sk_type == SOCK_RAW) {
939 switch (l2cap_pi(sk)->sec_level) {
940 case BT_SECURITY_HIGH:
941 auth_type = HCI_AT_DEDICATED_BONDING_MITM;
943 case BT_SECURITY_MEDIUM:
944 auth_type = HCI_AT_DEDICATED_BONDING;
947 auth_type = HCI_AT_NO_BONDING;
950 } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
951 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
952 auth_type = HCI_AT_NO_BONDING_MITM;
954 auth_type = HCI_AT_NO_BONDING;
956 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
957 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
959 switch (l2cap_pi(sk)->sec_level) {
960 case BT_SECURITY_HIGH:
961 auth_type = HCI_AT_GENERAL_BONDING_MITM;
963 case BT_SECURITY_MEDIUM:
964 auth_type = HCI_AT_GENERAL_BONDING;
967 auth_type = HCI_AT_NO_BONDING;
972 hcon = hci_connect(hdev, ACL_LINK, dst,
973 l2cap_pi(sk)->sec_level, auth_type);
977 conn = l2cap_conn_add(hcon, 0);
985 /* Update source addr of the socket */
986 bacpy(src, conn->src);
988 l2cap_chan_add(conn, sk, NULL);
990 sk->sk_state = BT_CONNECT;
991 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
993 if (hcon->state == BT_CONNECTED) {
994 if (sk->sk_type != SOCK_SEQPACKET) {
995 l2cap_sock_clear_timer(sk);
996 sk->sk_state = BT_CONNECTED;
1002 hci_dev_unlock_bh(hdev);
1007 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
1009 struct sock *sk = sock->sk;
1010 struct sockaddr_l2 la;
1013 BT_DBG("sk %p", sk);
1015 if (!addr || alen < sizeof(addr->sa_family) ||
1016 addr->sa_family != AF_BLUETOOTH)
1019 memset(&la, 0, sizeof(la));
1020 len = min_t(unsigned int, sizeof(la), alen);
1021 memcpy(&la, addr, len);
1028 if (sk->sk_type == SOCK_SEQPACKET && !la.l2_psm) {
1033 switch (l2cap_pi(sk)->mode) {
1034 case L2CAP_MODE_BASIC:
1036 case L2CAP_MODE_ERTM:
1037 case L2CAP_MODE_STREAMING:
1046 switch (sk->sk_state) {
1050 /* Already connecting */
1054 /* Already connected */
1067 /* Set destination address and psm */
1068 bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
1069 l2cap_pi(sk)->psm = la.l2_psm;
1071 err = l2cap_do_connect(sk);
1076 err = bt_sock_wait_state(sk, BT_CONNECTED,
1077 sock_sndtimeo(sk, flags & O_NONBLOCK));
1083 static int l2cap_sock_listen(struct socket *sock, int backlog)
1085 struct sock *sk = sock->sk;
1088 BT_DBG("sk %p backlog %d", sk, backlog);
1092 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
1097 switch (l2cap_pi(sk)->mode) {
1098 case L2CAP_MODE_BASIC:
1100 case L2CAP_MODE_ERTM:
1101 case L2CAP_MODE_STREAMING:
1110 if (!l2cap_pi(sk)->psm) {
1111 bdaddr_t *src = &bt_sk(sk)->src;
1116 write_lock_bh(&l2cap_sk_list.lock);
1118 for (psm = 0x1001; psm < 0x1100; psm += 2)
1119 if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
1120 l2cap_pi(sk)->psm = cpu_to_le16(psm);
1121 l2cap_pi(sk)->sport = cpu_to_le16(psm);
1126 write_unlock_bh(&l2cap_sk_list.lock);
1132 sk->sk_max_ack_backlog = backlog;
1133 sk->sk_ack_backlog = 0;
1134 sk->sk_state = BT_LISTEN;
1141 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
1143 DECLARE_WAITQUEUE(wait, current);
1144 struct sock *sk = sock->sk, *nsk;
1148 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1150 if (sk->sk_state != BT_LISTEN) {
1155 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1157 BT_DBG("sk %p timeo %ld", sk, timeo);
1159 /* Wait for an incoming connection. (wake-one). */
1160 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1161 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
1162 set_current_state(TASK_INTERRUPTIBLE);
1169 timeo = schedule_timeout(timeo);
1170 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1172 if (sk->sk_state != BT_LISTEN) {
1177 if (signal_pending(current)) {
1178 err = sock_intr_errno(timeo);
1182 set_current_state(TASK_RUNNING);
1183 remove_wait_queue(sk_sleep(sk), &wait);
1188 newsock->state = SS_CONNECTED;
1190 BT_DBG("new socket %p", nsk);
1197 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
1199 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
1200 struct sock *sk = sock->sk;
1202 BT_DBG("sock %p, sk %p", sock, sk);
1204 addr->sa_family = AF_BLUETOOTH;
1205 *len = sizeof(struct sockaddr_l2);
1208 la->l2_psm = l2cap_pi(sk)->psm;
1209 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
1210 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1212 la->l2_psm = l2cap_pi(sk)->sport;
1213 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
1214 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
1220 static void l2cap_monitor_timeout(unsigned long arg)
1222 struct sock *sk = (void *) arg;
1226 if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
1227 l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk);
1232 l2cap_pi(sk)->retry_count++;
1233 __mod_monitor_timer();
1235 control = L2CAP_CTRL_POLL;
1236 l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
1240 static void l2cap_retrans_timeout(unsigned long arg)
1242 struct sock *sk = (void *) arg;
1246 l2cap_pi(sk)->retry_count = 1;
1247 __mod_monitor_timer();
1249 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
1251 control = L2CAP_CTRL_POLL;
1252 l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
1256 static void l2cap_drop_acked_frames(struct sock *sk)
1258 struct sk_buff *skb;
1260 while ((skb = skb_peek(TX_QUEUE(sk)))) {
1261 if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
1264 skb = skb_dequeue(TX_QUEUE(sk));
1267 l2cap_pi(sk)->unacked_frames--;
1270 if (!l2cap_pi(sk)->unacked_frames)
1271 del_timer(&l2cap_pi(sk)->retrans_timer);
1276 static inline int l2cap_do_send(struct sock *sk, struct sk_buff *skb)
1278 struct l2cap_pinfo *pi = l2cap_pi(sk);
1281 BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
1283 err = hci_send_acl(pi->conn->hcon, skb, 0);
1290 static int l2cap_streaming_send(struct sock *sk)
1292 struct sk_buff *skb, *tx_skb;
1293 struct l2cap_pinfo *pi = l2cap_pi(sk);
1297 while ((skb = sk->sk_send_head)) {
1298 tx_skb = skb_clone(skb, GFP_ATOMIC);
1300 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1301 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
1302 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1304 if (pi->fcs == L2CAP_FCS_CRC16) {
1305 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1306 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1309 err = l2cap_do_send(sk, tx_skb);
1311 l2cap_send_disconn_req(pi->conn, sk);
1315 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1317 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1318 sk->sk_send_head = NULL;
1320 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
1322 skb = skb_dequeue(TX_QUEUE(sk));
1328 static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq)
1330 struct l2cap_pinfo *pi = l2cap_pi(sk);
1331 struct sk_buff *skb, *tx_skb;
1335 skb = skb_peek(TX_QUEUE(sk));
1337 if (bt_cb(skb)->tx_seq != tx_seq) {
1338 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1340 skb = skb_queue_next(TX_QUEUE(sk), skb);
1344 if (pi->remote_max_tx &&
1345 bt_cb(skb)->retries == pi->remote_max_tx) {
1346 l2cap_send_disconn_req(pi->conn, sk);
1350 tx_skb = skb_clone(skb, GFP_ATOMIC);
1351 bt_cb(skb)->retries++;
1352 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1353 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1354 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1355 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1357 if (pi->fcs == L2CAP_FCS_CRC16) {
1358 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1359 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1362 err = l2cap_do_send(sk, tx_skb);
1364 l2cap_send_disconn_req(pi->conn, sk);
1372 static int l2cap_ertm_send(struct sock *sk)
1374 struct sk_buff *skb, *tx_skb;
1375 struct l2cap_pinfo *pi = l2cap_pi(sk);
1379 if (pi->conn_state & L2CAP_CONN_WAIT_F)
1382 while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) &&
1383 !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) {
1385 if (pi->remote_max_tx &&
1386 bt_cb(skb)->retries == pi->remote_max_tx) {
1387 l2cap_send_disconn_req(pi->conn, sk);
1391 tx_skb = skb_clone(skb, GFP_ATOMIC);
1393 bt_cb(skb)->retries++;
1395 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1396 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1397 control |= L2CAP_CTRL_FINAL;
1398 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1400 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1401 | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1402 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1405 if (pi->fcs == L2CAP_FCS_CRC16) {
1406 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1407 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1410 err = l2cap_do_send(sk, tx_skb);
1412 l2cap_send_disconn_req(pi->conn, sk);
1415 __mod_retrans_timer();
1417 bt_cb(skb)->tx_seq = pi->next_tx_seq;
1418 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1420 pi->unacked_frames++;
1423 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1424 sk->sk_send_head = NULL;
1426 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
1434 static int l2cap_send_ack(struct l2cap_pinfo *pi)
1436 struct sock *sk = (struct sock *)pi;
1439 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1441 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1442 control |= L2CAP_SUPER_RCV_NOT_READY;
1443 return l2cap_send_sframe(pi, control);
1444 } else if (l2cap_ertm_send(sk) == 0) {
1445 control |= L2CAP_SUPER_RCV_READY;
1446 return l2cap_send_sframe(pi, control);
1451 static int l2cap_send_srejtail(struct sock *sk)
1453 struct srej_list *tail;
1456 control = L2CAP_SUPER_SELECT_REJECT;
1457 control |= L2CAP_CTRL_FINAL;
1459 tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
1460 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1462 l2cap_send_sframe(l2cap_pi(sk), control);
1467 static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1469 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1470 struct sk_buff **frag;
1473 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
1480 /* Continuation fragments (no L2CAP header) */
1481 frag = &skb_shinfo(skb)->frag_list;
1483 count = min_t(unsigned int, conn->mtu, len);
1485 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1488 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1494 frag = &(*frag)->next;
1500 static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1502 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1503 struct sk_buff *skb;
1504 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1505 struct l2cap_hdr *lh;
1507 BT_DBG("sk %p len %d", sk, (int)len);
1509 count = min_t(unsigned int, (conn->mtu - hlen), len);
1510 skb = bt_skb_send_alloc(sk, count + hlen,
1511 msg->msg_flags & MSG_DONTWAIT, &err);
1513 return ERR_PTR(-ENOMEM);
1515 /* Create L2CAP header */
1516 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1517 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1518 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1519 put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
1521 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1522 if (unlikely(err < 0)) {
1524 return ERR_PTR(err);
1529 static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1531 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1532 struct sk_buff *skb;
1533 int err, count, hlen = L2CAP_HDR_SIZE;
1534 struct l2cap_hdr *lh;
1536 BT_DBG("sk %p len %d", sk, (int)len);
1538 count = min_t(unsigned int, (conn->mtu - hlen), len);
1539 skb = bt_skb_send_alloc(sk, count + hlen,
1540 msg->msg_flags & MSG_DONTWAIT, &err);
1542 return ERR_PTR(-ENOMEM);
1544 /* Create L2CAP header */
1545 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1546 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1547 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1549 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1550 if (unlikely(err < 0)) {
1552 return ERR_PTR(err);
1557 static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1559 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1560 struct sk_buff *skb;
1561 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1562 struct l2cap_hdr *lh;
1564 BT_DBG("sk %p len %d", sk, (int)len);
1569 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1572 count = min_t(unsigned int, (conn->mtu - hlen), len);
1573 skb = bt_skb_send_alloc(sk, count + hlen,
1574 msg->msg_flags & MSG_DONTWAIT, &err);
1576 return ERR_PTR(-ENOMEM);
1578 /* Create L2CAP header */
1579 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1580 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1581 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1582 put_unaligned_le16(control, skb_put(skb, 2));
1584 put_unaligned_le16(sdulen, skb_put(skb, 2));
1586 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1587 if (unlikely(err < 0)) {
1589 return ERR_PTR(err);
1592 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1593 put_unaligned_le16(0, skb_put(skb, 2));
1595 bt_cb(skb)->retries = 0;
1599 static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
1601 struct l2cap_pinfo *pi = l2cap_pi(sk);
1602 struct sk_buff *skb;
1603 struct sk_buff_head sar_queue;
1607 __skb_queue_head_init(&sar_queue);
1608 control = L2CAP_SDU_START;
1609 skb = l2cap_create_iframe_pdu(sk, msg, pi->max_pdu_size, control, len);
1611 return PTR_ERR(skb);
1613 __skb_queue_tail(&sar_queue, skb);
1614 len -= pi->max_pdu_size;
1615 size +=pi->max_pdu_size;
1621 if (len > pi->max_pdu_size) {
1622 control |= L2CAP_SDU_CONTINUE;
1623 buflen = pi->max_pdu_size;
1625 control |= L2CAP_SDU_END;
1629 skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0);
1631 skb_queue_purge(&sar_queue);
1632 return PTR_ERR(skb);
1635 __skb_queue_tail(&sar_queue, skb);
1640 skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
1641 if (sk->sk_send_head == NULL)
1642 sk->sk_send_head = sar_queue.next;
1647 static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
1649 struct sock *sk = sock->sk;
1650 struct l2cap_pinfo *pi = l2cap_pi(sk);
1651 struct sk_buff *skb;
1655 BT_DBG("sock %p, sk %p", sock, sk);
1657 err = sock_error(sk);
1661 if (msg->msg_flags & MSG_OOB)
1666 if (sk->sk_state != BT_CONNECTED) {
1671 /* Connectionless channel */
1672 if (sk->sk_type == SOCK_DGRAM) {
1673 skb = l2cap_create_connless_pdu(sk, msg, len);
1677 err = l2cap_do_send(sk, skb);
1682 case L2CAP_MODE_BASIC:
1683 /* Check outgoing MTU */
1684 if (len > pi->omtu) {
1689 /* Create a basic PDU */
1690 skb = l2cap_create_basic_pdu(sk, msg, len);
1696 err = l2cap_do_send(sk, skb);
1701 case L2CAP_MODE_ERTM:
1702 case L2CAP_MODE_STREAMING:
1703 /* Entire SDU fits into one PDU */
1704 if (len <= pi->max_pdu_size) {
1705 control = L2CAP_SDU_UNSEGMENTED;
1706 skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
1711 __skb_queue_tail(TX_QUEUE(sk), skb);
1712 if (sk->sk_send_head == NULL)
1713 sk->sk_send_head = skb;
1715 /* Segment SDU into multiples PDUs */
1716 err = l2cap_sar_segment_sdu(sk, msg, len);
1721 if (pi->mode == L2CAP_MODE_STREAMING)
1722 err = l2cap_streaming_send(sk);
1724 err = l2cap_ertm_send(sk);
1731 BT_DBG("bad state %1.1x", pi->mode);
1740 static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
1742 struct sock *sk = sock->sk;
1746 if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
1747 struct l2cap_conn_rsp rsp;
1749 sk->sk_state = BT_CONFIG;
1751 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1752 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1753 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1754 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1755 l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
1756 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1764 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
1767 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
1769 struct sock *sk = sock->sk;
1770 struct l2cap_options opts;
1774 BT_DBG("sk %p", sk);
1780 opts.imtu = l2cap_pi(sk)->imtu;
1781 opts.omtu = l2cap_pi(sk)->omtu;
1782 opts.flush_to = l2cap_pi(sk)->flush_to;
1783 opts.mode = l2cap_pi(sk)->mode;
1784 opts.fcs = l2cap_pi(sk)->fcs;
1786 len = min_t(unsigned int, sizeof(opts), optlen);
1787 if (copy_from_user((char *) &opts, optval, len)) {
1792 l2cap_pi(sk)->imtu = opts.imtu;
1793 l2cap_pi(sk)->omtu = opts.omtu;
1794 l2cap_pi(sk)->mode = opts.mode;
1795 l2cap_pi(sk)->fcs = opts.fcs;
1799 if (get_user(opt, (u32 __user *) optval)) {
1804 if (opt & L2CAP_LM_AUTH)
1805 l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
1806 if (opt & L2CAP_LM_ENCRYPT)
1807 l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
1808 if (opt & L2CAP_LM_SECURE)
1809 l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
1811 l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
1812 l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
1824 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1826 struct sock *sk = sock->sk;
1827 struct bt_security sec;
1831 BT_DBG("sk %p", sk);
1833 if (level == SOL_L2CAP)
1834 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
1836 if (level != SOL_BLUETOOTH)
1837 return -ENOPROTOOPT;
1843 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
1848 sec.level = BT_SECURITY_LOW;
1850 len = min_t(unsigned int, sizeof(sec), optlen);
1851 if (copy_from_user((char *) &sec, optval, len)) {
1856 if (sec.level < BT_SECURITY_LOW ||
1857 sec.level > BT_SECURITY_HIGH) {
1862 l2cap_pi(sk)->sec_level = sec.level;
1865 case BT_DEFER_SETUP:
1866 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1871 if (get_user(opt, (u32 __user *) optval)) {
1876 bt_sk(sk)->defer_setup = opt;
1888 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
1890 struct sock *sk = sock->sk;
1891 struct l2cap_options opts;
1892 struct l2cap_conninfo cinfo;
1896 BT_DBG("sk %p", sk);
1898 if (get_user(len, optlen))
1905 opts.imtu = l2cap_pi(sk)->imtu;
1906 opts.omtu = l2cap_pi(sk)->omtu;
1907 opts.flush_to = l2cap_pi(sk)->flush_to;
1908 opts.mode = l2cap_pi(sk)->mode;
1909 opts.fcs = l2cap_pi(sk)->fcs;
1911 len = min_t(unsigned int, len, sizeof(opts));
1912 if (copy_to_user(optval, (char *) &opts, len))
1918 switch (l2cap_pi(sk)->sec_level) {
1919 case BT_SECURITY_LOW:
1920 opt = L2CAP_LM_AUTH;
1922 case BT_SECURITY_MEDIUM:
1923 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
1925 case BT_SECURITY_HIGH:
1926 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
1934 if (l2cap_pi(sk)->role_switch)
1935 opt |= L2CAP_LM_MASTER;
1937 if (l2cap_pi(sk)->force_reliable)
1938 opt |= L2CAP_LM_RELIABLE;
1940 if (put_user(opt, (u32 __user *) optval))
1944 case L2CAP_CONNINFO:
1945 if (sk->sk_state != BT_CONNECTED &&
1946 !(sk->sk_state == BT_CONNECT2 &&
1947 bt_sk(sk)->defer_setup)) {
1952 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
1953 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
1955 len = min_t(unsigned int, len, sizeof(cinfo));
1956 if (copy_to_user(optval, (char *) &cinfo, len))
1970 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1972 struct sock *sk = sock->sk;
1973 struct bt_security sec;
1976 BT_DBG("sk %p", sk);
1978 if (level == SOL_L2CAP)
1979 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
1981 if (level != SOL_BLUETOOTH)
1982 return -ENOPROTOOPT;
1984 if (get_user(len, optlen))
1991 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
1996 sec.level = l2cap_pi(sk)->sec_level;
1998 len = min_t(unsigned int, len, sizeof(sec));
1999 if (copy_to_user(optval, (char *) &sec, len))
2004 case BT_DEFER_SETUP:
2005 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2010 if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
2024 static int l2cap_sock_shutdown(struct socket *sock, int how)
2026 struct sock *sk = sock->sk;
2029 BT_DBG("sock %p, sk %p", sock, sk);
2035 if (!sk->sk_shutdown) {
2036 sk->sk_shutdown = SHUTDOWN_MASK;
2037 l2cap_sock_clear_timer(sk);
2038 __l2cap_sock_close(sk, 0);
2040 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
2041 err = bt_sock_wait_state(sk, BT_CLOSED,
2048 static int l2cap_sock_release(struct socket *sock)
2050 struct sock *sk = sock->sk;
2053 BT_DBG("sock %p, sk %p", sock, sk);
2058 err = l2cap_sock_shutdown(sock, 2);
2061 l2cap_sock_kill(sk);
2065 static void l2cap_chan_ready(struct sock *sk)
2067 struct sock *parent = bt_sk(sk)->parent;
2069 BT_DBG("sk %p, parent %p", sk, parent);
2071 l2cap_pi(sk)->conf_state = 0;
2072 l2cap_sock_clear_timer(sk);
2075 /* Outgoing channel.
2076 * Wake up socket sleeping on connect.
2078 sk->sk_state = BT_CONNECTED;
2079 sk->sk_state_change(sk);
2081 /* Incoming channel.
2082 * Wake up socket sleeping on accept.
2084 parent->sk_data_ready(parent, 0);
2088 /* Copy frame to all raw sockets on that connection */
2089 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2091 struct l2cap_chan_list *l = &conn->chan_list;
2092 struct sk_buff *nskb;
2095 BT_DBG("conn %p", conn);
2097 read_lock(&l->lock);
2098 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2099 if (sk->sk_type != SOCK_RAW)
2102 /* Don't send frame to the socket it came from */
2105 nskb = skb_clone(skb, GFP_ATOMIC);
2109 if (sock_queue_rcv_skb(sk, nskb))
2112 read_unlock(&l->lock);
2115 /* ---- L2CAP signalling commands ---- */
2116 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2117 u8 code, u8 ident, u16 dlen, void *data)
2119 struct sk_buff *skb, **frag;
2120 struct l2cap_cmd_hdr *cmd;
2121 struct l2cap_hdr *lh;
2124 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2125 conn, code, ident, dlen);
2127 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2128 count = min_t(unsigned int, conn->mtu, len);
2130 skb = bt_skb_alloc(count, GFP_ATOMIC);
2134 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2135 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
2136 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
2138 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2141 cmd->len = cpu_to_le16(dlen);
2144 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2145 memcpy(skb_put(skb, count), data, count);
2151 /* Continuation fragments (no L2CAP header) */
2152 frag = &skb_shinfo(skb)->frag_list;
2154 count = min_t(unsigned int, conn->mtu, len);
2156 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2160 memcpy(skb_put(*frag, count), data, count);
2165 frag = &(*frag)->next;
2175 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2177 struct l2cap_conf_opt *opt = *ptr;
2180 len = L2CAP_CONF_OPT_SIZE + opt->len;
2188 *val = *((u8 *) opt->val);
2192 *val = __le16_to_cpu(*((__le16 *) opt->val));
2196 *val = __le32_to_cpu(*((__le32 *) opt->val));
2200 *val = (unsigned long) opt->val;
2204 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2208 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2210 struct l2cap_conf_opt *opt = *ptr;
2212 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2219 *((u8 *) opt->val) = val;
2223 *((__le16 *) opt->val) = cpu_to_le16(val);
2227 *((__le32 *) opt->val) = cpu_to_le32(val);
2231 memcpy(opt->val, (void *) val, len);
2235 *ptr += L2CAP_CONF_OPT_SIZE + len;
2238 static void l2cap_ack_timeout(unsigned long arg)
2240 struct sock *sk = (void *) arg;
2243 l2cap_send_ack(l2cap_pi(sk));
2247 static inline void l2cap_ertm_init(struct sock *sk)
2249 l2cap_pi(sk)->expected_ack_seq = 0;
2250 l2cap_pi(sk)->unacked_frames = 0;
2251 l2cap_pi(sk)->buffer_seq = 0;
2252 l2cap_pi(sk)->num_to_ack = 0;
2253 l2cap_pi(sk)->frames_sent = 0;
2255 setup_timer(&l2cap_pi(sk)->retrans_timer,
2256 l2cap_retrans_timeout, (unsigned long) sk);
2257 setup_timer(&l2cap_pi(sk)->monitor_timer,
2258 l2cap_monitor_timeout, (unsigned long) sk);
2259 setup_timer(&l2cap_pi(sk)->ack_timer,
2260 l2cap_ack_timeout, (unsigned long) sk);
2262 __skb_queue_head_init(SREJ_QUEUE(sk));
2265 static int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
2267 u32 local_feat_mask = l2cap_feat_mask;
2269 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
2272 case L2CAP_MODE_ERTM:
2273 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
2274 case L2CAP_MODE_STREAMING:
2275 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
2281 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2284 case L2CAP_MODE_STREAMING:
2285 case L2CAP_MODE_ERTM:
2286 if (l2cap_mode_supported(mode, remote_feat_mask))
2290 return L2CAP_MODE_BASIC;
2294 static int l2cap_build_conf_req(struct sock *sk, void *data)
2296 struct l2cap_pinfo *pi = l2cap_pi(sk);
2297 struct l2cap_conf_req *req = data;
2298 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
2299 void *ptr = req->data;
2301 BT_DBG("sk %p", sk);
2303 if (pi->num_conf_req || pi->num_conf_rsp)
2307 case L2CAP_MODE_STREAMING:
2308 case L2CAP_MODE_ERTM:
2309 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
2310 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2311 l2cap_send_disconn_req(pi->conn, sk);
2314 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2320 case L2CAP_MODE_BASIC:
2321 if (pi->imtu != L2CAP_DEFAULT_MTU)
2322 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
2325 case L2CAP_MODE_ERTM:
2326 rfc.mode = L2CAP_MODE_ERTM;
2327 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
2328 rfc.max_transmit = max_transmit;
2329 rfc.retrans_timeout = 0;
2330 rfc.monitor_timeout = 0;
2331 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
2332 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2333 rfc.max_pdu_size = pi->conn->mtu - 10;
2335 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2336 sizeof(rfc), (unsigned long) &rfc);
2338 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2341 if (pi->fcs == L2CAP_FCS_NONE ||
2342 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2343 pi->fcs = L2CAP_FCS_NONE;
2344 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2348 case L2CAP_MODE_STREAMING:
2349 rfc.mode = L2CAP_MODE_STREAMING;
2351 rfc.max_transmit = 0;
2352 rfc.retrans_timeout = 0;
2353 rfc.monitor_timeout = 0;
2354 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
2355 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2356 rfc.max_pdu_size = pi->conn->mtu - 10;
2358 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2359 sizeof(rfc), (unsigned long) &rfc);
2361 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2364 if (pi->fcs == L2CAP_FCS_NONE ||
2365 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2366 pi->fcs = L2CAP_FCS_NONE;
2367 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2372 /* FIXME: Need actual value of the flush timeout */
2373 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2374 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2376 req->dcid = cpu_to_le16(pi->dcid);
2377 req->flags = cpu_to_le16(0);
2382 static int l2cap_parse_conf_req(struct sock *sk, void *data)
2384 struct l2cap_pinfo *pi = l2cap_pi(sk);
2385 struct l2cap_conf_rsp *rsp = data;
2386 void *ptr = rsp->data;
2387 void *req = pi->conf_req;
2388 int len = pi->conf_len;
2389 int type, hint, olen;
2391 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
2392 u16 mtu = L2CAP_DEFAULT_MTU;
2393 u16 result = L2CAP_CONF_SUCCESS;
2395 BT_DBG("sk %p", sk);
2397 while (len >= L2CAP_CONF_OPT_SIZE) {
2398 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
2400 hint = type & L2CAP_CONF_HINT;
2401 type &= L2CAP_CONF_MASK;
2404 case L2CAP_CONF_MTU:
2408 case L2CAP_CONF_FLUSH_TO:
2412 case L2CAP_CONF_QOS:
2415 case L2CAP_CONF_RFC:
2416 if (olen == sizeof(rfc))
2417 memcpy(&rfc, (void *) val, olen);
2420 case L2CAP_CONF_FCS:
2421 if (val == L2CAP_FCS_NONE)
2422 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2430 result = L2CAP_CONF_UNKNOWN;
2431 *((u8 *) ptr++) = type;
2436 if (pi->num_conf_rsp || pi->num_conf_req)
2440 case L2CAP_MODE_STREAMING:
2441 case L2CAP_MODE_ERTM:
2442 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
2443 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2444 return -ECONNREFUSED;
2447 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2452 if (pi->mode != rfc.mode) {
2453 result = L2CAP_CONF_UNACCEPT;
2454 rfc.mode = pi->mode;
2456 if (pi->num_conf_rsp == 1)
2457 return -ECONNREFUSED;
2459 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2460 sizeof(rfc), (unsigned long) &rfc);
2464 if (result == L2CAP_CONF_SUCCESS) {
2465 /* Configure output options and let the other side know
2466 * which ones we don't like. */
2468 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2469 result = L2CAP_CONF_UNACCEPT;
2472 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2474 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2477 case L2CAP_MODE_BASIC:
2478 pi->fcs = L2CAP_FCS_NONE;
2479 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2482 case L2CAP_MODE_ERTM:
2483 pi->remote_tx_win = rfc.txwin_size;
2484 pi->remote_max_tx = rfc.max_transmit;
2485 pi->max_pdu_size = rfc.max_pdu_size;
2487 rfc.retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
2488 rfc.monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
2490 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2492 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2493 sizeof(rfc), (unsigned long) &rfc);
2497 case L2CAP_MODE_STREAMING:
2498 pi->max_pdu_size = rfc.max_pdu_size;
2500 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2502 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2503 sizeof(rfc), (unsigned long) &rfc);
2508 result = L2CAP_CONF_UNACCEPT;
2510 memset(&rfc, 0, sizeof(rfc));
2511 rfc.mode = pi->mode;
2514 if (result == L2CAP_CONF_SUCCESS)
2515 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2517 rsp->scid = cpu_to_le16(pi->dcid);
2518 rsp->result = cpu_to_le16(result);
2519 rsp->flags = cpu_to_le16(0x0000);
2524 static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2526 struct l2cap_pinfo *pi = l2cap_pi(sk);
2527 struct l2cap_conf_req *req = data;
2528 void *ptr = req->data;
2531 struct l2cap_conf_rfc rfc;
2533 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2535 while (len >= L2CAP_CONF_OPT_SIZE) {
2536 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2539 case L2CAP_CONF_MTU:
2540 if (val < L2CAP_DEFAULT_MIN_MTU) {
2541 *result = L2CAP_CONF_UNACCEPT;
2542 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2545 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2548 case L2CAP_CONF_FLUSH_TO:
2550 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2554 case L2CAP_CONF_RFC:
2555 if (olen == sizeof(rfc))
2556 memcpy(&rfc, (void *)val, olen);
2558 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2559 rfc.mode != pi->mode)
2560 return -ECONNREFUSED;
2562 pi->mode = rfc.mode;
2565 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2566 sizeof(rfc), (unsigned long) &rfc);
2571 if (*result == L2CAP_CONF_SUCCESS) {
2573 case L2CAP_MODE_ERTM:
2574 pi->remote_tx_win = rfc.txwin_size;
2575 pi->retrans_timeout = rfc.retrans_timeout;
2576 pi->monitor_timeout = rfc.monitor_timeout;
2577 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2579 case L2CAP_MODE_STREAMING:
2580 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2585 req->dcid = cpu_to_le16(pi->dcid);
2586 req->flags = cpu_to_le16(0x0000);
2591 static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
2593 struct l2cap_conf_rsp *rsp = data;
2594 void *ptr = rsp->data;
2596 BT_DBG("sk %p", sk);
2598 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
2599 rsp->result = cpu_to_le16(result);
2600 rsp->flags = cpu_to_le16(flags);
2605 static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
2607 struct l2cap_pinfo *pi = l2cap_pi(sk);
2610 struct l2cap_conf_rfc rfc;
2612 BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
2614 if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
2617 while (len >= L2CAP_CONF_OPT_SIZE) {
2618 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2621 case L2CAP_CONF_RFC:
2622 if (olen == sizeof(rfc))
2623 memcpy(&rfc, (void *)val, olen);
2630 case L2CAP_MODE_ERTM:
2631 pi->remote_tx_win = rfc.txwin_size;
2632 pi->retrans_timeout = rfc.retrans_timeout;
2633 pi->monitor_timeout = rfc.monitor_timeout;
2634 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2636 case L2CAP_MODE_STREAMING:
2637 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2641 static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2643 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2645 if (rej->reason != 0x0000)
2648 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2649 cmd->ident == conn->info_ident) {
2650 del_timer(&conn->info_timer);
2652 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2653 conn->info_ident = 0;
2655 l2cap_conn_start(conn);
2661 static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2663 struct l2cap_chan_list *list = &conn->chan_list;
2664 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2665 struct l2cap_conn_rsp rsp;
2666 struct sock *sk, *parent;
2667 int result, status = L2CAP_CS_NO_INFO;
2669 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
2670 __le16 psm = req->psm;
2672 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2674 /* Check if we have socket listening on psm */
2675 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2677 result = L2CAP_CR_BAD_PSM;
2681 /* Check if the ACL is secure enough (if not SDP) */
2682 if (psm != cpu_to_le16(0x0001) &&
2683 !hci_conn_check_link_mode(conn->hcon)) {
2684 conn->disc_reason = 0x05;
2685 result = L2CAP_CR_SEC_BLOCK;
2689 result = L2CAP_CR_NO_MEM;
2691 /* Check for backlog size */
2692 if (sk_acceptq_is_full(parent)) {
2693 BT_DBG("backlog full %d", parent->sk_ack_backlog);
2697 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
2701 write_lock_bh(&list->lock);
2703 /* Check if we already have channel with that dcid */
2704 if (__l2cap_get_chan_by_dcid(list, scid)) {
2705 write_unlock_bh(&list->lock);
2706 sock_set_flag(sk, SOCK_ZAPPED);
2707 l2cap_sock_kill(sk);
2711 hci_conn_hold(conn->hcon);
2713 l2cap_sock_init(sk, parent);
2714 bacpy(&bt_sk(sk)->src, conn->src);
2715 bacpy(&bt_sk(sk)->dst, conn->dst);
2716 l2cap_pi(sk)->psm = psm;
2717 l2cap_pi(sk)->dcid = scid;
2719 __l2cap_chan_add(conn, sk, parent);
2720 dcid = l2cap_pi(sk)->scid;
2722 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2724 l2cap_pi(sk)->ident = cmd->ident;
2726 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2727 if (l2cap_check_security(sk)) {
2728 if (bt_sk(sk)->defer_setup) {
2729 sk->sk_state = BT_CONNECT2;
2730 result = L2CAP_CR_PEND;
2731 status = L2CAP_CS_AUTHOR_PEND;
2732 parent->sk_data_ready(parent, 0);
2734 sk->sk_state = BT_CONFIG;
2735 result = L2CAP_CR_SUCCESS;
2736 status = L2CAP_CS_NO_INFO;
2739 sk->sk_state = BT_CONNECT2;
2740 result = L2CAP_CR_PEND;
2741 status = L2CAP_CS_AUTHEN_PEND;
2744 sk->sk_state = BT_CONNECT2;
2745 result = L2CAP_CR_PEND;
2746 status = L2CAP_CS_NO_INFO;
2749 write_unlock_bh(&list->lock);
2752 bh_unlock_sock(parent);
2755 rsp.scid = cpu_to_le16(scid);
2756 rsp.dcid = cpu_to_le16(dcid);
2757 rsp.result = cpu_to_le16(result);
2758 rsp.status = cpu_to_le16(status);
2759 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2761 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2762 struct l2cap_info_req info;
2763 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2765 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2766 conn->info_ident = l2cap_get_ident(conn);
2768 mod_timer(&conn->info_timer, jiffies +
2769 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2771 l2cap_send_cmd(conn, conn->info_ident,
2772 L2CAP_INFO_REQ, sizeof(info), &info);
2778 static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2780 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2781 u16 scid, dcid, result, status;
2785 scid = __le16_to_cpu(rsp->scid);
2786 dcid = __le16_to_cpu(rsp->dcid);
2787 result = __le16_to_cpu(rsp->result);
2788 status = __le16_to_cpu(rsp->status);
2790 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2793 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2797 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
2803 case L2CAP_CR_SUCCESS:
2804 sk->sk_state = BT_CONFIG;
2805 l2cap_pi(sk)->ident = 0;
2806 l2cap_pi(sk)->dcid = dcid;
2807 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
2809 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2811 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2812 l2cap_build_conf_req(sk, req), req);
2813 l2cap_pi(sk)->num_conf_req++;
2817 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
2821 l2cap_chan_del(sk, ECONNREFUSED);
2829 static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
2831 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2837 dcid = __le16_to_cpu(req->dcid);
2838 flags = __le16_to_cpu(req->flags);
2840 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2842 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
2846 if (sk->sk_state == BT_DISCONN)
2849 /* Reject if config buffer is too small. */
2850 len = cmd_len - sizeof(*req);
2851 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
2852 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2853 l2cap_build_conf_rsp(sk, rsp,
2854 L2CAP_CONF_REJECT, flags), rsp);
2859 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
2860 l2cap_pi(sk)->conf_len += len;
2862 if (flags & 0x0001) {
2863 /* Incomplete config. Send empty response. */
2864 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2865 l2cap_build_conf_rsp(sk, rsp,
2866 L2CAP_CONF_SUCCESS, 0x0001), rsp);
2870 /* Complete config. */
2871 len = l2cap_parse_conf_req(sk, rsp);
2873 l2cap_send_disconn_req(conn, sk);
2877 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
2878 l2cap_pi(sk)->num_conf_rsp++;
2880 /* Reset config buffer. */
2881 l2cap_pi(sk)->conf_len = 0;
2883 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
2886 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
2887 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2888 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
2889 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2891 sk->sk_state = BT_CONNECTED;
2893 l2cap_pi(sk)->next_tx_seq = 0;
2894 l2cap_pi(sk)->expected_tx_seq = 0;
2895 __skb_queue_head_init(TX_QUEUE(sk));
2896 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2897 l2cap_ertm_init(sk);
2899 l2cap_chan_ready(sk);
2903 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
2905 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2906 l2cap_build_conf_req(sk, buf), buf);
2907 l2cap_pi(sk)->num_conf_req++;
2915 static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2917 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2918 u16 scid, flags, result;
2920 int len = cmd->len - sizeof(*rsp);
2922 scid = __le16_to_cpu(rsp->scid);
2923 flags = __le16_to_cpu(rsp->flags);
2924 result = __le16_to_cpu(rsp->result);
2926 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2927 scid, flags, result);
2929 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2934 case L2CAP_CONF_SUCCESS:
2935 l2cap_conf_rfc_get(sk, rsp->data, len);
2938 case L2CAP_CONF_UNACCEPT:
2939 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
2942 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
2943 l2cap_send_disconn_req(conn, sk);
2947 /* throw out any old stored conf requests */
2948 result = L2CAP_CONF_SUCCESS;
2949 len = l2cap_parse_conf_rsp(sk, rsp->data,
2952 l2cap_send_disconn_req(conn, sk);
2956 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2957 L2CAP_CONF_REQ, len, req);
2958 l2cap_pi(sk)->num_conf_req++;
2959 if (result != L2CAP_CONF_SUCCESS)
2965 sk->sk_state = BT_DISCONN;
2966 sk->sk_err = ECONNRESET;
2967 l2cap_sock_set_timer(sk, HZ * 5);
2968 l2cap_send_disconn_req(conn, sk);
2975 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
2977 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
2978 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2979 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
2980 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2982 sk->sk_state = BT_CONNECTED;
2983 l2cap_pi(sk)->next_tx_seq = 0;
2984 l2cap_pi(sk)->expected_tx_seq = 0;
2985 __skb_queue_head_init(TX_QUEUE(sk));
2986 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2987 l2cap_ertm_init(sk);
2989 l2cap_chan_ready(sk);
2997 static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2999 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3000 struct l2cap_disconn_rsp rsp;
3004 scid = __le16_to_cpu(req->scid);
3005 dcid = __le16_to_cpu(req->dcid);
3007 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3009 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3013 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3014 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
3015 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3017 sk->sk_shutdown = SHUTDOWN_MASK;
3019 skb_queue_purge(TX_QUEUE(sk));
3021 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
3022 skb_queue_purge(SREJ_QUEUE(sk));
3023 del_timer(&l2cap_pi(sk)->retrans_timer);
3024 del_timer(&l2cap_pi(sk)->monitor_timer);
3025 del_timer(&l2cap_pi(sk)->ack_timer);
3028 l2cap_chan_del(sk, ECONNRESET);
3031 l2cap_sock_kill(sk);
3035 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3037 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3041 scid = __le16_to_cpu(rsp->scid);
3042 dcid = __le16_to_cpu(rsp->dcid);
3044 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3046 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3050 skb_queue_purge(TX_QUEUE(sk));
3052 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
3053 skb_queue_purge(SREJ_QUEUE(sk));
3054 del_timer(&l2cap_pi(sk)->retrans_timer);
3055 del_timer(&l2cap_pi(sk)->monitor_timer);
3056 del_timer(&l2cap_pi(sk)->ack_timer);
3059 l2cap_chan_del(sk, 0);
3062 l2cap_sock_kill(sk);
3066 static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3068 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
3071 type = __le16_to_cpu(req->type);
3073 BT_DBG("type 0x%4.4x", type);
3075 if (type == L2CAP_IT_FEAT_MASK) {
3077 u32 feat_mask = l2cap_feat_mask;
3078 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3079 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3080 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3082 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3084 put_unaligned_le32(feat_mask, rsp->data);
3085 l2cap_send_cmd(conn, cmd->ident,
3086 L2CAP_INFO_RSP, sizeof(buf), buf);
3087 } else if (type == L2CAP_IT_FIXED_CHAN) {
3089 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3090 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3091 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3092 memcpy(buf + 4, l2cap_fixed_chan, 8);
3093 l2cap_send_cmd(conn, cmd->ident,
3094 L2CAP_INFO_RSP, sizeof(buf), buf);
3096 struct l2cap_info_rsp rsp;
3097 rsp.type = cpu_to_le16(type);
3098 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3099 l2cap_send_cmd(conn, cmd->ident,
3100 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3106 static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3108 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3111 type = __le16_to_cpu(rsp->type);
3112 result = __le16_to_cpu(rsp->result);
3114 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3116 del_timer(&conn->info_timer);
3118 if (type == L2CAP_IT_FEAT_MASK) {
3119 conn->feat_mask = get_unaligned_le32(rsp->data);
3121 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
3122 struct l2cap_info_req req;
3123 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3125 conn->info_ident = l2cap_get_ident(conn);
3127 l2cap_send_cmd(conn, conn->info_ident,
3128 L2CAP_INFO_REQ, sizeof(req), &req);
3130 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3131 conn->info_ident = 0;
3133 l2cap_conn_start(conn);
3135 } else if (type == L2CAP_IT_FIXED_CHAN) {
3136 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3137 conn->info_ident = 0;
3139 l2cap_conn_start(conn);
3145 static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3147 u8 *data = skb->data;
3149 struct l2cap_cmd_hdr cmd;
3152 l2cap_raw_recv(conn, skb);
3154 while (len >= L2CAP_CMD_HDR_SIZE) {
3156 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3157 data += L2CAP_CMD_HDR_SIZE;
3158 len -= L2CAP_CMD_HDR_SIZE;
3160 cmd_len = le16_to_cpu(cmd.len);
3162 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
3164 if (cmd_len > len || !cmd.ident) {
3165 BT_DBG("corrupted command");
3170 case L2CAP_COMMAND_REJ:
3171 l2cap_command_rej(conn, &cmd, data);
3174 case L2CAP_CONN_REQ:
3175 err = l2cap_connect_req(conn, &cmd, data);
3178 case L2CAP_CONN_RSP:
3179 err = l2cap_connect_rsp(conn, &cmd, data);
3182 case L2CAP_CONF_REQ:
3183 err = l2cap_config_req(conn, &cmd, cmd_len, data);
3186 case L2CAP_CONF_RSP:
3187 err = l2cap_config_rsp(conn, &cmd, data);
3190 case L2CAP_DISCONN_REQ:
3191 err = l2cap_disconnect_req(conn, &cmd, data);
3194 case L2CAP_DISCONN_RSP:
3195 err = l2cap_disconnect_rsp(conn, &cmd, data);
3198 case L2CAP_ECHO_REQ:
3199 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
3202 case L2CAP_ECHO_RSP:
3205 case L2CAP_INFO_REQ:
3206 err = l2cap_information_req(conn, &cmd, data);
3209 case L2CAP_INFO_RSP:
3210 err = l2cap_information_rsp(conn, &cmd, data);
3214 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3220 struct l2cap_cmd_rej rej;
3221 BT_DBG("error %d", err);
3223 /* FIXME: Map err to a valid reason */
3224 rej.reason = cpu_to_le16(0);
3225 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3235 static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3237 u16 our_fcs, rcv_fcs;
3238 int hdr_size = L2CAP_HDR_SIZE + 2;
3240 if (pi->fcs == L2CAP_FCS_CRC16) {
3241 skb_trim(skb, skb->len - 2);
3242 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3243 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3245 if (our_fcs != rcv_fcs)
3251 static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3253 struct l2cap_pinfo *pi = l2cap_pi(sk);
3256 pi->frames_sent = 0;
3257 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
3259 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3261 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3262 control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL;
3263 l2cap_send_sframe(pi, control);
3264 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
3267 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0)
3268 __mod_retrans_timer();
3270 l2cap_ertm_send(sk);
3272 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3273 pi->frames_sent == 0) {
3274 control |= L2CAP_SUPER_RCV_READY;
3275 l2cap_send_sframe(pi, control);
3279 static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
3281 struct sk_buff *next_skb;
3283 bt_cb(skb)->tx_seq = tx_seq;
3284 bt_cb(skb)->sar = sar;
3286 next_skb = skb_peek(SREJ_QUEUE(sk));
3288 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3293 if (bt_cb(next_skb)->tx_seq > tx_seq) {
3294 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
3298 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3301 } while((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
3303 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3306 static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3308 struct l2cap_pinfo *pi = l2cap_pi(sk);
3309 struct sk_buff *_skb;
3312 switch (control & L2CAP_CTRL_SAR) {
3313 case L2CAP_SDU_UNSEGMENTED:
3314 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3319 err = sock_queue_rcv_skb(sk, skb);
3325 case L2CAP_SDU_START:
3326 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3331 pi->sdu_len = get_unaligned_le16(skb->data);
3334 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3340 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3342 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3343 pi->partial_sdu_len = skb->len;
3347 case L2CAP_SDU_CONTINUE:
3348 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3351 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3353 pi->partial_sdu_len += skb->len;
3354 if (pi->partial_sdu_len > pi->sdu_len)
3362 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3365 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3367 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3368 pi->partial_sdu_len += skb->len;
3370 if (pi->partial_sdu_len > pi->imtu)
3373 if (pi->partial_sdu_len == pi->sdu_len) {
3374 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3375 err = sock_queue_rcv_skb(sk, _skb);
3390 static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3392 struct sk_buff *skb;
3395 while((skb = skb_peek(SREJ_QUEUE(sk)))) {
3396 if (bt_cb(skb)->tx_seq != tx_seq)
3399 skb = skb_dequeue(SREJ_QUEUE(sk));
3400 control |= bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3401 l2cap_sar_reassembly_sdu(sk, skb, control);
3402 l2cap_pi(sk)->buffer_seq_srej =
3403 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
3408 static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3410 struct l2cap_pinfo *pi = l2cap_pi(sk);
3411 struct srej_list *l, *tmp;
3414 list_for_each_entry_safe(l,tmp, SREJ_LIST(sk), list) {
3415 if (l->tx_seq == tx_seq) {
3420 control = L2CAP_SUPER_SELECT_REJECT;
3421 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3422 l2cap_send_sframe(pi, control);
3424 list_add_tail(&l->list, SREJ_LIST(sk));
3428 static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3430 struct l2cap_pinfo *pi = l2cap_pi(sk);
3431 struct srej_list *new;
3434 while (tx_seq != pi->expected_tx_seq) {
3435 control = L2CAP_SUPER_SELECT_REJECT;
3436 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3437 l2cap_send_sframe(pi, control);
3439 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
3440 new->tx_seq = pi->expected_tx_seq++;
3441 list_add_tail(&new->list, SREJ_LIST(sk));
3443 pi->expected_tx_seq++;
3446 static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3448 struct l2cap_pinfo *pi = l2cap_pi(sk);
3449 u8 tx_seq = __get_txseq(rx_control);
3450 u8 req_seq = __get_reqseq(rx_control);
3451 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
3454 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3456 if (L2CAP_CTRL_FINAL & rx_control) {
3457 del_timer(&pi->monitor_timer);
3458 if (pi->unacked_frames > 0)
3459 __mod_retrans_timer();
3460 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3463 pi->expected_ack_seq = req_seq;
3464 l2cap_drop_acked_frames(sk);
3466 if (tx_seq == pi->expected_tx_seq)
3469 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3470 struct srej_list *first;
3472 first = list_first_entry(SREJ_LIST(sk),
3473 struct srej_list, list);
3474 if (tx_seq == first->tx_seq) {
3475 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3476 l2cap_check_srej_gap(sk, tx_seq);
3478 list_del(&first->list);
3481 if (list_empty(SREJ_LIST(sk))) {
3482 pi->buffer_seq = pi->buffer_seq_srej;
3483 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
3486 struct srej_list *l;
3487 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3489 list_for_each_entry(l, SREJ_LIST(sk), list) {
3490 if (l->tx_seq == tx_seq) {
3491 l2cap_resend_srejframe(sk, tx_seq);
3495 l2cap_send_srejframe(sk, tx_seq);
3498 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
3500 INIT_LIST_HEAD(SREJ_LIST(sk));
3501 pi->buffer_seq_srej = pi->buffer_seq;
3503 __skb_queue_head_init(SREJ_QUEUE(sk));
3504 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3506 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
3508 l2cap_send_srejframe(sk, tx_seq);
3513 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3515 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3516 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3520 if (rx_control & L2CAP_CTRL_FINAL) {
3521 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3522 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3524 sk->sk_send_head = TX_QUEUE(sk)->next;
3525 pi->next_tx_seq = pi->expected_ack_seq;
3526 l2cap_ertm_send(sk);
3530 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3532 err = l2cap_sar_reassembly_sdu(sk, skb, rx_control);
3538 pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK;
3539 if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1)
3545 static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
3547 struct l2cap_pinfo *pi = l2cap_pi(sk);
3549 pi->expected_ack_seq = __get_reqseq(rx_control);
3550 l2cap_drop_acked_frames(sk);
3552 if (rx_control & L2CAP_CTRL_POLL) {
3553 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3554 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3555 (pi->unacked_frames > 0))
3556 __mod_retrans_timer();
3558 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3559 l2cap_send_srejtail(sk);
3561 l2cap_send_i_or_rr_or_rnr(sk);
3562 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3565 } else if (rx_control & L2CAP_CTRL_FINAL) {
3566 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3568 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3569 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3571 sk->sk_send_head = TX_QUEUE(sk)->next;
3572 pi->next_tx_seq = pi->expected_ack_seq;
3573 l2cap_ertm_send(sk);
3577 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3578 (pi->unacked_frames > 0))
3579 __mod_retrans_timer();
3581 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3582 if (pi->conn_state & L2CAP_CONN_SREJ_SENT)
3585 l2cap_ertm_send(sk);
3589 static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
3591 struct l2cap_pinfo *pi = l2cap_pi(sk);
3592 u8 tx_seq = __get_reqseq(rx_control);
3594 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3596 pi->expected_ack_seq = tx_seq;
3597 l2cap_drop_acked_frames(sk);
3599 if (rx_control & L2CAP_CTRL_FINAL) {
3600 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3601 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3603 sk->sk_send_head = TX_QUEUE(sk)->next;
3604 pi->next_tx_seq = pi->expected_ack_seq;
3605 l2cap_ertm_send(sk);
3608 sk->sk_send_head = TX_QUEUE(sk)->next;
3609 pi->next_tx_seq = pi->expected_ack_seq;
3610 l2cap_ertm_send(sk);
3612 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3613 pi->srej_save_reqseq = tx_seq;
3614 pi->conn_state |= L2CAP_CONN_REJ_ACT;
3618 static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
3620 struct l2cap_pinfo *pi = l2cap_pi(sk);
3621 u8 tx_seq = __get_reqseq(rx_control);
3623 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3625 if (rx_control & L2CAP_CTRL_POLL) {
3626 pi->expected_ack_seq = tx_seq;
3627 l2cap_drop_acked_frames(sk);
3628 l2cap_retransmit_frame(sk, tx_seq);
3629 l2cap_ertm_send(sk);
3630 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3631 pi->srej_save_reqseq = tx_seq;
3632 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
3634 } else if (rx_control & L2CAP_CTRL_FINAL) {
3635 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
3636 pi->srej_save_reqseq == tx_seq)
3637 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
3639 l2cap_retransmit_frame(sk, tx_seq);
3641 l2cap_retransmit_frame(sk, tx_seq);
3642 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3643 pi->srej_save_reqseq = tx_seq;
3644 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
3649 static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
3651 struct l2cap_pinfo *pi = l2cap_pi(sk);
3652 u8 tx_seq = __get_reqseq(rx_control);
3654 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
3655 pi->expected_ack_seq = tx_seq;
3656 l2cap_drop_acked_frames(sk);
3658 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
3659 del_timer(&pi->retrans_timer);
3660 if (rx_control & L2CAP_CTRL_POLL) {
3661 u16 control = L2CAP_CTRL_FINAL;
3662 l2cap_send_rr_or_rnr(pi, control);
3667 if (rx_control & L2CAP_CTRL_POLL)
3668 l2cap_send_srejtail(sk);
3670 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
3673 static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3675 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3677 if (L2CAP_CTRL_FINAL & rx_control) {
3678 del_timer(&l2cap_pi(sk)->monitor_timer);
3679 if (l2cap_pi(sk)->unacked_frames > 0)
3680 __mod_retrans_timer();
3681 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
3684 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
3685 case L2CAP_SUPER_RCV_READY:
3686 l2cap_data_channel_rrframe(sk, rx_control);
3689 case L2CAP_SUPER_REJECT:
3690 l2cap_data_channel_rejframe(sk, rx_control);
3693 case L2CAP_SUPER_SELECT_REJECT:
3694 l2cap_data_channel_srejframe(sk, rx_control);
3697 case L2CAP_SUPER_RCV_NOT_READY:
3698 l2cap_data_channel_rnrframe(sk, rx_control);
3706 static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
3709 struct l2cap_pinfo *pi;
3713 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
3715 BT_DBG("unknown cid 0x%4.4x", cid);
3721 BT_DBG("sk %p, len %d", sk, skb->len);
3723 if (sk->sk_state != BT_CONNECTED)
3727 case L2CAP_MODE_BASIC:
3728 /* If socket recv buffers overflows we drop data here
3729 * which is *bad* because L2CAP has to be reliable.
3730 * But we don't have any other choice. L2CAP doesn't
3731 * provide flow control mechanism. */
3733 if (pi->imtu < skb->len)
3736 if (!sock_queue_rcv_skb(sk, skb))
3740 case L2CAP_MODE_ERTM:
3741 control = get_unaligned_le16(skb->data);
3745 if (__is_sar_start(control))
3748 if (pi->fcs == L2CAP_FCS_CRC16)
3752 * We can just drop the corrupted I-frame here.
3753 * Receiver will miss it and start proper recovery
3754 * procedures and ask retransmission.
3756 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE)
3759 if (l2cap_check_fcs(pi, skb))
3762 if (__is_iframe(control)) {
3766 l2cap_data_channel_iframe(sk, control, skb);
3771 l2cap_data_channel_sframe(sk, control, skb);
3776 case L2CAP_MODE_STREAMING:
3777 control = get_unaligned_le16(skb->data);
3781 if (__is_sar_start(control))
3784 if (pi->fcs == L2CAP_FCS_CRC16)
3787 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || len < 4
3788 || __is_sframe(control))
3791 if (l2cap_check_fcs(pi, skb))
3794 tx_seq = __get_txseq(control);
3796 if (pi->expected_tx_seq == tx_seq)
3797 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3799 pi->expected_tx_seq = (tx_seq + 1) % 64;
3801 l2cap_sar_reassembly_sdu(sk, skb, control);
3806 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
3820 static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
3824 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
3828 BT_DBG("sk %p, len %d", sk, skb->len);
3830 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
3833 if (l2cap_pi(sk)->imtu < skb->len)
3836 if (!sock_queue_rcv_skb(sk, skb))
3848 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
3850 struct l2cap_hdr *lh = (void *) skb->data;
3854 skb_pull(skb, L2CAP_HDR_SIZE);
3855 cid = __le16_to_cpu(lh->cid);
3856 len = __le16_to_cpu(lh->len);
3858 if (len != skb->len) {
3863 BT_DBG("len %d, cid 0x%4.4x", len, cid);
3866 case L2CAP_CID_SIGNALING:
3867 l2cap_sig_channel(conn, skb);
3870 case L2CAP_CID_CONN_LESS:
3871 psm = get_unaligned_le16(skb->data);
3873 l2cap_conless_channel(conn, psm, skb);
3877 l2cap_data_channel(conn, cid, skb);
3882 /* ---- L2CAP interface with lower layer (HCI) ---- */
3884 static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
3886 int exact = 0, lm1 = 0, lm2 = 0;
3887 register struct sock *sk;
3888 struct hlist_node *node;
3890 if (type != ACL_LINK)
3893 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
3895 /* Find listening sockets and check their link_mode */
3896 read_lock(&l2cap_sk_list.lock);
3897 sk_for_each(sk, node, &l2cap_sk_list.head) {
3898 if (sk->sk_state != BT_LISTEN)
3901 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
3902 lm1 |= HCI_LM_ACCEPT;
3903 if (l2cap_pi(sk)->role_switch)
3904 lm1 |= HCI_LM_MASTER;
3906 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
3907 lm2 |= HCI_LM_ACCEPT;
3908 if (l2cap_pi(sk)->role_switch)
3909 lm2 |= HCI_LM_MASTER;
3912 read_unlock(&l2cap_sk_list.lock);
3914 return exact ? lm1 : lm2;
3917 static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
3919 struct l2cap_conn *conn;
3921 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
3923 if (hcon->type != ACL_LINK)
3927 conn = l2cap_conn_add(hcon, status);
3929 l2cap_conn_ready(conn);
3931 l2cap_conn_del(hcon, bt_err(status));
3936 static int l2cap_disconn_ind(struct hci_conn *hcon)
3938 struct l2cap_conn *conn = hcon->l2cap_data;
3940 BT_DBG("hcon %p", hcon);
3942 if (hcon->type != ACL_LINK || !conn)
3945 return conn->disc_reason;
3948 static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
3950 BT_DBG("hcon %p reason %d", hcon, reason);
3952 if (hcon->type != ACL_LINK)
3955 l2cap_conn_del(hcon, bt_err(reason));
3960 static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
3962 if (sk->sk_type != SOCK_SEQPACKET)
3965 if (encrypt == 0x00) {
3966 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
3967 l2cap_sock_clear_timer(sk);
3968 l2cap_sock_set_timer(sk, HZ * 5);
3969 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
3970 __l2cap_sock_close(sk, ECONNREFUSED);
3972 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
3973 l2cap_sock_clear_timer(sk);
3977 static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
3979 struct l2cap_chan_list *l;
3980 struct l2cap_conn *conn = hcon->l2cap_data;
3986 l = &conn->chan_list;
3988 BT_DBG("conn %p", conn);
3990 read_lock(&l->lock);
3992 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
3995 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
4000 if (!status && (sk->sk_state == BT_CONNECTED ||
4001 sk->sk_state == BT_CONFIG)) {
4002 l2cap_check_encryption(sk, encrypt);
4007 if (sk->sk_state == BT_CONNECT) {
4009 struct l2cap_conn_req req;
4010 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
4011 req.psm = l2cap_pi(sk)->psm;
4013 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
4015 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4016 L2CAP_CONN_REQ, sizeof(req), &req);
4018 l2cap_sock_clear_timer(sk);
4019 l2cap_sock_set_timer(sk, HZ / 10);
4021 } else if (sk->sk_state == BT_CONNECT2) {
4022 struct l2cap_conn_rsp rsp;
4026 sk->sk_state = BT_CONFIG;
4027 result = L2CAP_CR_SUCCESS;
4029 sk->sk_state = BT_DISCONN;
4030 l2cap_sock_set_timer(sk, HZ / 10);
4031 result = L2CAP_CR_SEC_BLOCK;
4034 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
4035 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
4036 rsp.result = cpu_to_le16(result);
4037 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4038 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4039 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4045 read_unlock(&l->lock);
4050 static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4052 struct l2cap_conn *conn = hcon->l2cap_data;
4054 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4057 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4059 if (flags & ACL_START) {
4060 struct l2cap_hdr *hdr;
4064 BT_ERR("Unexpected start frame (len %d)", skb->len);
4065 kfree_skb(conn->rx_skb);
4066 conn->rx_skb = NULL;
4068 l2cap_conn_unreliable(conn, ECOMM);
4072 BT_ERR("Frame is too short (len %d)", skb->len);
4073 l2cap_conn_unreliable(conn, ECOMM);
4077 hdr = (struct l2cap_hdr *) skb->data;
4078 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4080 if (len == skb->len) {
4081 /* Complete frame received */
4082 l2cap_recv_frame(conn, skb);
4086 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4088 if (skb->len > len) {
4089 BT_ERR("Frame is too long (len %d, expected len %d)",
4091 l2cap_conn_unreliable(conn, ECOMM);
4095 /* Allocate skb for the complete frame (with header) */
4096 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4100 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4102 conn->rx_len = len - skb->len;
4104 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4106 if (!conn->rx_len) {
4107 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4108 l2cap_conn_unreliable(conn, ECOMM);
4112 if (skb->len > conn->rx_len) {
4113 BT_ERR("Fragment is too long (len %d, expected %d)",
4114 skb->len, conn->rx_len);
4115 kfree_skb(conn->rx_skb);
4116 conn->rx_skb = NULL;
4118 l2cap_conn_unreliable(conn, ECOMM);
4122 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4124 conn->rx_len -= skb->len;
4126 if (!conn->rx_len) {
4127 /* Complete frame received */
4128 l2cap_recv_frame(conn, conn->rx_skb);
4129 conn->rx_skb = NULL;
4138 static int l2cap_debugfs_show(struct seq_file *f, void *p)
4141 struct hlist_node *node;
4143 read_lock_bh(&l2cap_sk_list.lock);
4145 sk_for_each(sk, node, &l2cap_sk_list.head) {
4146 struct l2cap_pinfo *pi = l2cap_pi(sk);
4148 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4149 batostr(&bt_sk(sk)->src),
4150 batostr(&bt_sk(sk)->dst),
4151 sk->sk_state, __le16_to_cpu(pi->psm),
4153 pi->imtu, pi->omtu, pi->sec_level);
4156 read_unlock_bh(&l2cap_sk_list.lock);
4161 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4163 return single_open(file, l2cap_debugfs_show, inode->i_private);
4166 static const struct file_operations l2cap_debugfs_fops = {
4167 .open = l2cap_debugfs_open,
4169 .llseek = seq_lseek,
4170 .release = single_release,
4173 static struct dentry *l2cap_debugfs;
4175 static const struct proto_ops l2cap_sock_ops = {
4176 .family = PF_BLUETOOTH,
4177 .owner = THIS_MODULE,
4178 .release = l2cap_sock_release,
4179 .bind = l2cap_sock_bind,
4180 .connect = l2cap_sock_connect,
4181 .listen = l2cap_sock_listen,
4182 .accept = l2cap_sock_accept,
4183 .getname = l2cap_sock_getname,
4184 .sendmsg = l2cap_sock_sendmsg,
4185 .recvmsg = l2cap_sock_recvmsg,
4186 .poll = bt_sock_poll,
4187 .ioctl = bt_sock_ioctl,
4188 .mmap = sock_no_mmap,
4189 .socketpair = sock_no_socketpair,
4190 .shutdown = l2cap_sock_shutdown,
4191 .setsockopt = l2cap_sock_setsockopt,
4192 .getsockopt = l2cap_sock_getsockopt
4195 static const struct net_proto_family l2cap_sock_family_ops = {
4196 .family = PF_BLUETOOTH,
4197 .owner = THIS_MODULE,
4198 .create = l2cap_sock_create,
4201 static struct hci_proto l2cap_hci_proto = {
4203 .id = HCI_PROTO_L2CAP,
4204 .connect_ind = l2cap_connect_ind,
4205 .connect_cfm = l2cap_connect_cfm,
4206 .disconn_ind = l2cap_disconn_ind,
4207 .disconn_cfm = l2cap_disconn_cfm,
4208 .security_cfm = l2cap_security_cfm,
4209 .recv_acldata = l2cap_recv_acldata
4212 static int __init l2cap_init(void)
4216 err = proto_register(&l2cap_proto, 0);
4220 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4222 BT_ERR("L2CAP socket registration failed");
4226 err = hci_register_proto(&l2cap_hci_proto);
4228 BT_ERR("L2CAP protocol registration failed");
4229 bt_sock_unregister(BTPROTO_L2CAP);
4234 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4235 bt_debugfs, NULL, &l2cap_debugfs_fops);
4237 BT_ERR("Failed to create L2CAP debug file");
4240 BT_INFO("L2CAP ver %s", VERSION);
4241 BT_INFO("L2CAP socket layer initialized");
4246 proto_unregister(&l2cap_proto);
4250 static void __exit l2cap_exit(void)
4252 debugfs_remove(l2cap_debugfs);
4254 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4255 BT_ERR("L2CAP socket unregistration failed");
4257 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4258 BT_ERR("L2CAP protocol unregistration failed");
4260 proto_unregister(&l2cap_proto);
4263 void l2cap_load(void)
4265 /* Dummy function to trigger automatic L2CAP module loading by
4266 * other modules that use L2CAP sockets but don't use any other
4267 * symbols from it. */
4270 EXPORT_SYMBOL(l2cap_load);
4272 module_init(l2cap_init);
4273 module_exit(l2cap_exit);
4275 module_param(enable_ertm, bool, 0644);
4276 MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
4278 module_param(max_transmit, uint, 0644);
4279 MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)");
4281 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
4282 MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4283 MODULE_VERSION(VERSION);
4284 MODULE_LICENSE("GPL");
4285 MODULE_ALIAS("bt-proto-0");