Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 57 | #include <net/bluetooth/smp.h> |
1da177e4 | 58 | |
bb58f747 | 59 | int disable_ertm; |
a5fd6f30 | 60 | int enable_hs; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 63 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 64 | |
b5ad8b7f JB |
65 | static LIST_HEAD(chan_list); |
66 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
69 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
70 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
71 | void *data); | |
710f9b0a | 72 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
73 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
74 | struct l2cap_chan *chan, int err); | |
1da177e4 | 75 | |
218bb9df GP |
76 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
77 | ||
0139418c | 78 | /* ---- L2CAP channels ---- */ |
71ba0e56 GP |
79 | |
80 | static inline void chan_hold(struct l2cap_chan *c) | |
81 | { | |
82 | atomic_inc(&c->refcnt); | |
83 | } | |
84 | ||
85 | static inline void chan_put(struct l2cap_chan *c) | |
86 | { | |
87 | if (atomic_dec_and_test(&c->refcnt)) | |
88 | kfree(c); | |
89 | } | |
90 | ||
baa7e1fa | 91 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 92 | { |
48454079 | 93 | struct l2cap_chan *c; |
baa7e1fa GP |
94 | |
95 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 96 | if (c->dcid == cid) |
baa7e1fa | 97 | return c; |
0139418c | 98 | } |
baa7e1fa GP |
99 | return NULL; |
100 | ||
0139418c MH |
101 | } |
102 | ||
baa7e1fa | 103 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 104 | { |
48454079 | 105 | struct l2cap_chan *c; |
baa7e1fa GP |
106 | |
107 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 108 | if (c->scid == cid) |
baa7e1fa | 109 | return c; |
0139418c | 110 | } |
baa7e1fa | 111 | return NULL; |
0139418c MH |
112 | } |
113 | ||
114 | /* Find channel with given SCID. | |
115 | * Returns locked socket */ | |
baa7e1fa | 116 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 117 | { |
48454079 | 118 | struct l2cap_chan *c; |
baa7e1fa GP |
119 | |
120 | read_lock(&conn->chan_lock); | |
121 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
122 | if (c) |
123 | bh_lock_sock(c->sk); | |
baa7e1fa | 124 | read_unlock(&conn->chan_lock); |
48454079 | 125 | return c; |
0139418c MH |
126 | } |
127 | ||
baa7e1fa | 128 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 129 | { |
48454079 | 130 | struct l2cap_chan *c; |
baa7e1fa GP |
131 | |
132 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 133 | if (c->ident == ident) |
baa7e1fa | 134 | return c; |
0139418c | 135 | } |
baa7e1fa | 136 | return NULL; |
0139418c MH |
137 | } |
138 | ||
baa7e1fa | 139 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 140 | { |
48454079 | 141 | struct l2cap_chan *c; |
baa7e1fa GP |
142 | |
143 | read_lock(&conn->chan_lock); | |
144 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
145 | if (c) |
146 | bh_lock_sock(c->sk); | |
baa7e1fa | 147 | read_unlock(&conn->chan_lock); |
48454079 | 148 | return c; |
0139418c MH |
149 | } |
150 | ||
23691d75 | 151 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 152 | { |
23691d75 | 153 | struct l2cap_chan *c; |
9e4425ff | 154 | |
23691d75 GP |
155 | list_for_each_entry(c, &chan_list, global_l) { |
156 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
9e4425ff GP |
157 | goto found; |
158 | } | |
159 | ||
23691d75 | 160 | c = NULL; |
9e4425ff | 161 | found: |
23691d75 | 162 | return c; |
9e4425ff GP |
163 | } |
164 | ||
165 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
166 | { | |
73b2ec18 GP |
167 | int err; |
168 | ||
23691d75 | 169 | write_lock_bh(&chan_list_lock); |
9e4425ff | 170 | |
23691d75 | 171 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
172 | err = -EADDRINUSE; |
173 | goto done; | |
9e4425ff GP |
174 | } |
175 | ||
73b2ec18 GP |
176 | if (psm) { |
177 | chan->psm = psm; | |
178 | chan->sport = psm; | |
179 | err = 0; | |
180 | } else { | |
181 | u16 p; | |
182 | ||
183 | err = -EINVAL; | |
184 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 185 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
186 | chan->psm = cpu_to_le16(p); |
187 | chan->sport = cpu_to_le16(p); | |
188 | err = 0; | |
189 | break; | |
190 | } | |
191 | } | |
9e4425ff | 192 | |
73b2ec18 | 193 | done: |
23691d75 | 194 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 195 | return err; |
9e4425ff GP |
196 | } |
197 | ||
198 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
199 | { | |
23691d75 | 200 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
201 | |
202 | chan->scid = scid; | |
203 | ||
23691d75 | 204 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
205 | |
206 | return 0; | |
207 | } | |
208 | ||
baa7e1fa | 209 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 210 | { |
8db4dc46 | 211 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 212 | |
8db4dc46 | 213 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 214 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
215 | return cid; |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
c9b66675 | 221 | static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout) |
ab07801d | 222 | { |
457f4850 | 223 | BT_DBG("chan %p state %d timeout %ld", chan, chan->state, timeout); |
89bc500e | 224 | |
942ecc9c | 225 | if (!mod_timer(timer, jiffies + msecs_to_jiffies(timeout))) |
774e5651 | 226 | chan_hold(chan); |
ab07801d GP |
227 | } |
228 | ||
c9b66675 | 229 | static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer) |
ab07801d | 230 | { |
774e5651 | 231 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d | 232 | |
774e5651 MM |
233 | if (timer_pending(timer) && del_timer(timer)) |
234 | chan_put(chan); | |
ab07801d GP |
235 | } |
236 | ||
89bc500e GP |
237 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
238 | { | |
239 | chan->state = state; | |
240 | chan->ops->state_change(chan->data, state); | |
241 | } | |
242 | ||
ab07801d GP |
243 | static void l2cap_chan_timeout(unsigned long arg) |
244 | { | |
245 | struct l2cap_chan *chan = (struct l2cap_chan *) arg; | |
246 | struct sock *sk = chan->sk; | |
247 | int reason; | |
248 | ||
89bc500e | 249 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d GP |
250 | |
251 | bh_lock_sock(sk); | |
252 | ||
253 | if (sock_owned_by_user(sk)) { | |
254 | /* sk is owned by user. Try again later */ | |
c9b66675 | 255 | __set_chan_timer(chan, HZ / 5); |
ab07801d | 256 | bh_unlock_sock(sk); |
71ba0e56 | 257 | chan_put(chan); |
ab07801d GP |
258 | return; |
259 | } | |
260 | ||
89bc500e | 261 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 262 | reason = ECONNREFUSED; |
89bc500e | 263 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
264 | chan->sec_level != BT_SECURITY_SDP) |
265 | reason = ECONNREFUSED; | |
266 | else | |
267 | reason = ETIMEDOUT; | |
268 | ||
0f852724 | 269 | l2cap_chan_close(chan, reason); |
ab07801d GP |
270 | |
271 | bh_unlock_sock(sk); | |
272 | ||
ba3bd0ee | 273 | chan->ops->close(chan->data); |
71ba0e56 | 274 | chan_put(chan); |
ab07801d GP |
275 | } |
276 | ||
23691d75 | 277 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
278 | { |
279 | struct l2cap_chan *chan; | |
280 | ||
281 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
282 | if (!chan) | |
283 | return NULL; | |
284 | ||
285 | chan->sk = sk; | |
286 | ||
23691d75 GP |
287 | write_lock_bh(&chan_list_lock); |
288 | list_add(&chan->global_l, &chan_list); | |
289 | write_unlock_bh(&chan_list_lock); | |
290 | ||
ab07801d GP |
291 | setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan); |
292 | ||
89bc500e GP |
293 | chan->state = BT_OPEN; |
294 | ||
71ba0e56 GP |
295 | atomic_set(&chan->refcnt, 1); |
296 | ||
abc545b8 SJ |
297 | BT_DBG("sk %p chan %p", sk, chan); |
298 | ||
48454079 GP |
299 | return chan; |
300 | } | |
301 | ||
23691d75 | 302 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 303 | { |
23691d75 GP |
304 | write_lock_bh(&chan_list_lock); |
305 | list_del(&chan->global_l); | |
306 | write_unlock_bh(&chan_list_lock); | |
307 | ||
71ba0e56 | 308 | chan_put(chan); |
6ff5abbf GP |
309 | } |
310 | ||
48454079 | 311 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 312 | { |
af05b30b | 313 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 314 | chan->psm, chan->dcid); |
0139418c | 315 | |
9f5a0d7b | 316 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 317 | |
8c1d787b | 318 | chan->conn = conn; |
0139418c | 319 | |
715ec005 | 320 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
b62f328b VT |
321 | if (conn->hcon->type == LE_LINK) { |
322 | /* LE connection */ | |
0c1bc5c6 | 323 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
324 | chan->scid = L2CAP_CID_LE_DATA; |
325 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
326 | } else { |
327 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 328 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 329 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 330 | } |
715ec005 | 331 | } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
0139418c | 332 | /* Connectionless socket */ |
fe4128e0 GP |
333 | chan->scid = L2CAP_CID_CONN_LESS; |
334 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 335 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
336 | } else { |
337 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
338 | chan->scid = L2CAP_CID_SIGNALING; |
339 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 340 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
341 | } |
342 | ||
8f7975b1 AE |
343 | chan->local_id = L2CAP_BESTEFFORT_ID; |
344 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
345 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
346 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
347 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
348 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
349 | ||
71ba0e56 | 350 | chan_hold(chan); |
baa7e1fa GP |
351 | |
352 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
353 | } |
354 | ||
8e87d142 | 355 | /* Delete channel. |
0139418c | 356 | * Must be called on the locked socket. */ |
4519de9a | 357 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 358 | { |
48454079 | 359 | struct sock *sk = chan->sk; |
8c1d787b | 360 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
361 | struct sock *parent = bt_sk(sk)->parent; |
362 | ||
c9b66675 | 363 | __clear_chan_timer(chan); |
0139418c | 364 | |
49208c9c | 365 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 366 | |
8e87d142 | 367 | if (conn) { |
baa7e1fa GP |
368 | /* Delete from channel list */ |
369 | write_lock_bh(&conn->chan_lock); | |
370 | list_del(&chan->list); | |
371 | write_unlock_bh(&conn->chan_lock); | |
71ba0e56 | 372 | chan_put(chan); |
baa7e1fa | 373 | |
8c1d787b | 374 | chan->conn = NULL; |
0139418c MH |
375 | hci_conn_put(conn->hcon); |
376 | } | |
377 | ||
89bc500e | 378 | l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
379 | sock_set_flag(sk, SOCK_ZAPPED); |
380 | ||
381 | if (err) | |
382 | sk->sk_err = err; | |
383 | ||
384 | if (parent) { | |
385 | bt_accept_unlink(sk); | |
386 | parent->sk_data_ready(parent, 0); | |
387 | } else | |
388 | sk->sk_state_change(sk); | |
c13ffa62 | 389 | |
c1360a1c GP |
390 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
391 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 392 | return; |
2ead70b8 | 393 | |
58d35f87 | 394 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 395 | |
0c1bc5c6 | 396 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
397 | struct srej_list *l, *tmp; |
398 | ||
1a09bcb9 GP |
399 | __clear_retrans_timer(chan); |
400 | __clear_monitor_timer(chan); | |
401 | __clear_ack_timer(chan); | |
c13ffa62 | 402 | |
f1c6775b | 403 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 404 | |
39d5a3ee | 405 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
406 | list_del(&l->list); |
407 | kfree(l); | |
408 | } | |
409 | } | |
0139418c MH |
410 | } |
411 | ||
4519de9a GP |
412 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
413 | { | |
414 | struct sock *sk; | |
415 | ||
416 | BT_DBG("parent %p", parent); | |
417 | ||
418 | /* Close not yet accepted channels */ | |
0f852724 | 419 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 420 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
c9b66675 | 421 | __clear_chan_timer(chan); |
0f852724 | 422 | lock_sock(sk); |
ba3bd0ee | 423 | l2cap_chan_close(chan, ECONNRESET); |
0f852724 | 424 | release_sock(sk); |
ba3bd0ee | 425 | chan->ops->close(chan->data); |
0f852724 | 426 | } |
4519de9a GP |
427 | } |
428 | ||
0f852724 | 429 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
430 | { |
431 | struct l2cap_conn *conn = chan->conn; | |
432 | struct sock *sk = chan->sk; | |
433 | ||
89bc500e | 434 | BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); |
4519de9a | 435 | |
89bc500e | 436 | switch (chan->state) { |
4519de9a GP |
437 | case BT_LISTEN: |
438 | l2cap_chan_cleanup_listen(sk); | |
89bc500e GP |
439 | |
440 | l2cap_state_change(chan, BT_CLOSED); | |
441 | sock_set_flag(sk, SOCK_ZAPPED); | |
4519de9a GP |
442 | break; |
443 | ||
444 | case BT_CONNECTED: | |
445 | case BT_CONFIG: | |
715ec005 | 446 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 447 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
448 | __clear_chan_timer(chan); |
449 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
450 | l2cap_send_disconn_req(conn, chan, reason); |
451 | } else | |
452 | l2cap_chan_del(chan, reason); | |
453 | break; | |
454 | ||
455 | case BT_CONNECT2: | |
715ec005 | 456 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
457 | conn->hcon->type == ACL_LINK) { |
458 | struct l2cap_conn_rsp rsp; | |
459 | __u16 result; | |
460 | ||
461 | if (bt_sk(sk)->defer_setup) | |
462 | result = L2CAP_CR_SEC_BLOCK; | |
463 | else | |
464 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 465 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
466 | |
467 | rsp.scid = cpu_to_le16(chan->dcid); | |
468 | rsp.dcid = cpu_to_le16(chan->scid); | |
469 | rsp.result = cpu_to_le16(result); | |
470 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
471 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
472 | sizeof(rsp), &rsp); | |
473 | } | |
474 | ||
475 | l2cap_chan_del(chan, reason); | |
476 | break; | |
477 | ||
478 | case BT_CONNECT: | |
479 | case BT_DISCONN: | |
480 | l2cap_chan_del(chan, reason); | |
481 | break; | |
482 | ||
483 | default: | |
484 | sock_set_flag(sk, SOCK_ZAPPED); | |
485 | break; | |
486 | } | |
487 | } | |
488 | ||
4343478f | 489 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 490 | { |
715ec005 | 491 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 492 | switch (chan->sec_level) { |
8556edd3 JH |
493 | case BT_SECURITY_HIGH: |
494 | return HCI_AT_DEDICATED_BONDING_MITM; | |
495 | case BT_SECURITY_MEDIUM: | |
496 | return HCI_AT_DEDICATED_BONDING; | |
497 | default: | |
498 | return HCI_AT_NO_BONDING; | |
499 | } | |
fe4128e0 | 500 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
501 | if (chan->sec_level == BT_SECURITY_LOW) |
502 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 503 | |
4343478f | 504 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 505 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 506 | else |
8556edd3 | 507 | return HCI_AT_NO_BONDING; |
00ae4af9 | 508 | } else { |
4343478f | 509 | switch (chan->sec_level) { |
00ae4af9 | 510 | case BT_SECURITY_HIGH: |
8556edd3 | 511 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 512 | case BT_SECURITY_MEDIUM: |
8556edd3 | 513 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 514 | default: |
8556edd3 | 515 | return HCI_AT_NO_BONDING; |
00ae4af9 | 516 | } |
0684e5f9 | 517 | } |
8556edd3 JH |
518 | } |
519 | ||
520 | /* Service level security */ | |
4343478f | 521 | static inline int l2cap_check_security(struct l2cap_chan *chan) |
8556edd3 | 522 | { |
8c1d787b | 523 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
524 | __u8 auth_type; |
525 | ||
4343478f | 526 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 527 | |
4343478f | 528 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
529 | } |
530 | ||
b5ad8b7f | 531 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
532 | { |
533 | u8 id; | |
534 | ||
535 | /* Get next available identificator. | |
536 | * 1 - 128 are used by kernel. | |
537 | * 129 - 199 are reserved. | |
538 | * 200 - 254 are used by utilities like l2ping, etc. | |
539 | */ | |
540 | ||
541 | spin_lock_bh(&conn->lock); | |
542 | ||
543 | if (++conn->tx_ident > 128) | |
544 | conn->tx_ident = 1; | |
545 | ||
546 | id = conn->tx_ident; | |
547 | ||
548 | spin_unlock_bh(&conn->lock); | |
549 | ||
550 | return id; | |
551 | } | |
552 | ||
4519de9a | 553 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
554 | { |
555 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 556 | u8 flags; |
4e8402a3 MH |
557 | |
558 | BT_DBG("code 0x%2.2x", code); | |
559 | ||
560 | if (!skb) | |
9a9c6a34 | 561 | return; |
4e8402a3 | 562 | |
e702112f AE |
563 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
564 | flags = ACL_START_NO_FLUSH; | |
565 | else | |
566 | flags = ACL_START; | |
567 | ||
14b12d0b | 568 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 569 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 570 | |
73d80deb LAD |
571 | hci_send_acl(conn->hchan, skb, flags); |
572 | } | |
573 | ||
574 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
575 | { | |
576 | struct hci_conn *hcon = chan->conn->hcon; | |
577 | u16 flags; | |
578 | ||
579 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
580 | skb->priority); | |
581 | ||
582 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
583 | lmp_no_flush_capable(hcon->hdev)) | |
584 | flags = ACL_START_NO_FLUSH; | |
585 | else | |
586 | flags = ACL_START; | |
587 | ||
588 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
589 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
590 | } |
591 | ||
88843ab0 | 592 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) |
1c2acffb GP |
593 | { |
594 | struct sk_buff *skb; | |
595 | struct l2cap_hdr *lh; | |
8c1d787b | 596 | struct l2cap_conn *conn = chan->conn; |
e4ca6d98 | 597 | int count, hlen; |
fcc203c3 | 598 | |
89bc500e | 599 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
600 | return; |
601 | ||
e4ca6d98 AE |
602 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
603 | hlen = L2CAP_EXT_HDR_SIZE; | |
604 | else | |
605 | hlen = L2CAP_ENH_HDR_SIZE; | |
606 | ||
47d1ec61 | 607 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 608 | hlen += L2CAP_FCS_SIZE; |
1c2acffb | 609 | |
88843ab0 | 610 | BT_DBG("chan %p, control 0x%8.8x", chan, control); |
1c2acffb | 611 | |
fcc203c3 | 612 | count = min_t(unsigned int, conn->mtu, hlen); |
793c2f1c AE |
613 | |
614 | control |= __set_sframe(chan); | |
1c2acffb | 615 | |
e2ab4353 | 616 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 617 | control |= __set_ctrl_final(chan); |
9e917af1 | 618 | |
e2ab4353 | 619 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) |
e3781735 | 620 | control |= __set_ctrl_poll(chan); |
f0946ccf | 621 | |
1c2acffb GP |
622 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
623 | if (!skb) | |
9a9c6a34 | 624 | return; |
1c2acffb GP |
625 | |
626 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 627 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 628 | lh->cid = cpu_to_le16(chan->dcid); |
88843ab0 AE |
629 | |
630 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1c2acffb | 631 | |
47d1ec61 | 632 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
633 | u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); |
634 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
635 | } |
636 | ||
73d80deb LAD |
637 | skb->priority = HCI_PRIO_MAX; |
638 | l2cap_do_send(chan, skb); | |
1c2acffb GP |
639 | } |
640 | ||
88843ab0 | 641 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) |
7e743090 | 642 | { |
e2ab4353 | 643 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 644 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 645 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
1890d36b | 646 | } else |
ab784b73 | 647 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
7e743090 | 648 | |
0b209fae | 649 | control |= __set_reqseq(chan, chan->buffer_seq); |
2ab25cdd | 650 | |
525cd185 | 651 | l2cap_send_sframe(chan, control); |
7e743090 GP |
652 | } |
653 | ||
b4450035 | 654 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 655 | { |
c1360a1c | 656 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
657 | } |
658 | ||
fc7f8a7e | 659 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 660 | { |
8c1d787b | 661 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
662 | |
663 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
664 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
665 | return; | |
666 | ||
4343478f GP |
667 | if (l2cap_check_security(chan) && |
668 | __l2cap_no_conn_pending(chan)) { | |
b1235d79 | 669 | struct l2cap_conn_req req; |
fe4128e0 GP |
670 | req.scid = cpu_to_le16(chan->scid); |
671 | req.psm = chan->psm; | |
79d554a6 | 672 | |
fc7f8a7e | 673 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 674 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
79d554a6 | 675 | |
fc7f8a7e GP |
676 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
677 | sizeof(req), &req); | |
b1235d79 | 678 | } |
79d554a6 MH |
679 | } else { |
680 | struct l2cap_info_req req; | |
681 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
682 | ||
683 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
684 | conn->info_ident = l2cap_get_ident(conn); | |
685 | ||
686 | mod_timer(&conn->info_timer, jiffies + | |
687 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
688 | ||
689 | l2cap_send_cmd(conn, conn->info_ident, | |
690 | L2CAP_INFO_REQ, sizeof(req), &req); | |
691 | } | |
692 | } | |
693 | ||
cf6c2c0b GP |
694 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
695 | { | |
696 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 697 | if (!disable_ertm) |
cf6c2c0b GP |
698 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
699 | ||
700 | switch (mode) { | |
701 | case L2CAP_MODE_ERTM: | |
702 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
703 | case L2CAP_MODE_STREAMING: | |
704 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
705 | default: | |
706 | return 0x00; | |
707 | } | |
708 | } | |
709 | ||
4519de9a | 710 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 711 | { |
e92c8e70 | 712 | struct sock *sk; |
22121fc9 GP |
713 | struct l2cap_disconn_req req; |
714 | ||
c13ffa62 GP |
715 | if (!conn) |
716 | return; | |
717 | ||
e92c8e70 GP |
718 | sk = chan->sk; |
719 | ||
0c1bc5c6 | 720 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
721 | __clear_retrans_timer(chan); |
722 | __clear_monitor_timer(chan); | |
723 | __clear_ack_timer(chan); | |
c13ffa62 GP |
724 | } |
725 | ||
fe4128e0 GP |
726 | req.dcid = cpu_to_le16(chan->dcid); |
727 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
728 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
729 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 730 | |
89bc500e | 731 | l2cap_state_change(chan, BT_DISCONN); |
9b108fc0 | 732 | sk->sk_err = err; |
22121fc9 GP |
733 | } |
734 | ||
1da177e4 | 735 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
736 | static void l2cap_conn_start(struct l2cap_conn *conn) |
737 | { | |
820ffdb3 | 738 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
739 | |
740 | BT_DBG("conn %p", conn); | |
741 | ||
baa7e1fa | 742 | read_lock(&conn->chan_lock); |
4e8402a3 | 743 | |
820ffdb3 | 744 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 745 | struct sock *sk = chan->sk; |
baa7e1fa | 746 | |
4e8402a3 MH |
747 | bh_lock_sock(sk); |
748 | ||
715ec005 | 749 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
79d554a6 MH |
750 | bh_unlock_sock(sk); |
751 | continue; | |
752 | } | |
753 | ||
89bc500e | 754 | if (chan->state == BT_CONNECT) { |
47731de7 | 755 | struct l2cap_conn_req req; |
79d554a6 | 756 | |
4343478f | 757 | if (!l2cap_check_security(chan) || |
b4450035 | 758 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
759 | bh_unlock_sock(sk); |
760 | continue; | |
761 | } | |
79d554a6 | 762 | |
c1360a1c GP |
763 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
764 | && test_bit(CONF_STATE2_DEVICE, | |
765 | &chan->conf_state)) { | |
0f852724 | 766 | /* l2cap_chan_close() calls list_del(chan) |
820ffdb3 | 767 | * so release the lock */ |
2461daac | 768 | read_unlock(&conn->chan_lock); |
89bc500e | 769 | l2cap_chan_close(chan, ECONNRESET); |
2461daac | 770 | read_lock(&conn->chan_lock); |
47731de7 GP |
771 | bh_unlock_sock(sk); |
772 | continue; | |
b1235d79 | 773 | } |
47731de7 | 774 | |
fe4128e0 GP |
775 | req.scid = cpu_to_le16(chan->scid); |
776 | req.psm = chan->psm; | |
47731de7 | 777 | |
fc7f8a7e | 778 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 779 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
47731de7 | 780 | |
fc7f8a7e GP |
781 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
782 | sizeof(req), &req); | |
47731de7 | 783 | |
89bc500e | 784 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 785 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 786 | char buf[128]; |
fe4128e0 GP |
787 | rsp.scid = cpu_to_le16(chan->dcid); |
788 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 789 | |
4343478f | 790 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
791 | if (bt_sk(sk)->defer_setup) { |
792 | struct sock *parent = bt_sk(sk)->parent; | |
793 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
794 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
795 | if (parent) |
796 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
797 | |
798 | } else { | |
89bc500e | 799 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
800 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
801 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
802 | } | |
79d554a6 MH |
803 | } else { |
804 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
805 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
806 | } | |
807 | ||
fc7f8a7e GP |
808 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
809 | sizeof(rsp), &rsp); | |
e9aeb2dd | 810 | |
c1360a1c | 811 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd GP |
812 | rsp.result != L2CAP_CR_SUCCESS) { |
813 | bh_unlock_sock(sk); | |
814 | continue; | |
815 | } | |
816 | ||
c1360a1c | 817 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 818 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
819 | l2cap_build_conf_req(chan, buf), buf); |
820 | chan->num_conf_req++; | |
4e8402a3 MH |
821 | } |
822 | ||
823 | bh_unlock_sock(sk); | |
824 | } | |
825 | ||
baa7e1fa | 826 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
827 | } |
828 | ||
b62f328b VT |
829 | /* Find socket with cid and source bdaddr. |
830 | * Returns closest match, locked. | |
831 | */ | |
23691d75 | 832 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 833 | { |
23691d75 | 834 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 835 | |
23691d75 | 836 | read_lock(&chan_list_lock); |
b62f328b | 837 | |
23691d75 GP |
838 | list_for_each_entry(c, &chan_list, global_l) { |
839 | struct sock *sk = c->sk; | |
fe4128e0 | 840 | |
89bc500e | 841 | if (state && c->state != state) |
b62f328b VT |
842 | continue; |
843 | ||
23691d75 | 844 | if (c->scid == cid) { |
b62f328b | 845 | /* Exact match. */ |
23691d75 GP |
846 | if (!bacmp(&bt_sk(sk)->src, src)) { |
847 | read_unlock(&chan_list_lock); | |
848 | return c; | |
849 | } | |
b62f328b VT |
850 | |
851 | /* Closest match */ | |
852 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 853 | c1 = c; |
b62f328b VT |
854 | } |
855 | } | |
280f294f | 856 | |
23691d75 | 857 | read_unlock(&chan_list_lock); |
b62f328b | 858 | |
23691d75 | 859 | return c1; |
b62f328b VT |
860 | } |
861 | ||
862 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
863 | { | |
c916fbe4 | 864 | struct sock *parent, *sk; |
23691d75 | 865 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
866 | |
867 | BT_DBG(""); | |
868 | ||
869 | /* Check if we have socket listening on cid */ | |
23691d75 | 870 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 871 | conn->src); |
23691d75 | 872 | if (!pchan) |
b62f328b VT |
873 | return; |
874 | ||
23691d75 GP |
875 | parent = pchan->sk; |
876 | ||
62f3a2cf GP |
877 | bh_lock_sock(parent); |
878 | ||
b62f328b VT |
879 | /* Check for backlog size */ |
880 | if (sk_acceptq_is_full(parent)) { | |
881 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
882 | goto clean; | |
883 | } | |
884 | ||
80808e43 GP |
885 | chan = pchan->ops->new_connection(pchan->data); |
886 | if (!chan) | |
b62f328b VT |
887 | goto clean; |
888 | ||
80808e43 | 889 | sk = chan->sk; |
5d41ce1d | 890 | |
baa7e1fa | 891 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
892 | |
893 | hci_conn_hold(conn->hcon); | |
894 | ||
b62f328b VT |
895 | bacpy(&bt_sk(sk)->src, conn->src); |
896 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
897 | ||
d1010240 GP |
898 | bt_accept_enqueue(parent, sk); |
899 | ||
48454079 GP |
900 | __l2cap_chan_add(conn, chan); |
901 | ||
c9b66675 | 902 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 903 | |
89bc500e | 904 | l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
905 | parent->sk_data_ready(parent, 0); |
906 | ||
baa7e1fa | 907 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
908 | |
909 | clean: | |
910 | bh_unlock_sock(parent); | |
911 | } | |
912 | ||
f1cb9af5 VCG |
913 | static void l2cap_chan_ready(struct sock *sk) |
914 | { | |
915 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
916 | struct sock *parent = bt_sk(sk)->parent; | |
917 | ||
918 | BT_DBG("sk %p, parent %p", sk, parent); | |
919 | ||
920 | chan->conf_state = 0; | |
921 | __clear_chan_timer(chan); | |
922 | ||
43f3dc41 | 923 | l2cap_state_change(chan, BT_CONNECTED); |
f1cb9af5 VCG |
924 | sk->sk_state_change(sk); |
925 | ||
926 | if (parent) | |
927 | parent->sk_data_ready(parent, 0); | |
928 | } | |
929 | ||
4e8402a3 MH |
930 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
931 | { | |
48454079 | 932 | struct l2cap_chan *chan; |
4e8402a3 | 933 | |
79d554a6 | 934 | BT_DBG("conn %p", conn); |
4e8402a3 | 935 | |
b62f328b VT |
936 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
937 | l2cap_le_conn_ready(conn); | |
938 | ||
160dc6ac VCG |
939 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
940 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
941 | ||
baa7e1fa | 942 | read_lock(&conn->chan_lock); |
4e8402a3 | 943 | |
baa7e1fa | 944 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 945 | struct sock *sk = chan->sk; |
baa7e1fa | 946 | |
79d554a6 | 947 | bh_lock_sock(sk); |
4e8402a3 | 948 | |
63128451 | 949 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 950 | if (smp_conn_security(conn, chan->sec_level)) |
f1cb9af5 | 951 | l2cap_chan_ready(sk); |
acd7d370 | 952 | |
63128451 | 953 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 954 | __clear_chan_timer(chan); |
89bc500e | 955 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 956 | sk->sk_state_change(sk); |
b501d6a1 | 957 | |
89bc500e | 958 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 959 | l2cap_do_start(chan); |
4e8402a3 | 960 | |
79d554a6 | 961 | bh_unlock_sock(sk); |
4e8402a3 | 962 | } |
79d554a6 | 963 | |
baa7e1fa | 964 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
965 | } |
966 | ||
967 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
968 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
969 | { | |
48454079 | 970 | struct l2cap_chan *chan; |
4e8402a3 MH |
971 | |
972 | BT_DBG("conn %p", conn); | |
973 | ||
baa7e1fa | 974 | read_lock(&conn->chan_lock); |
4e8402a3 | 975 | |
baa7e1fa | 976 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 977 | struct sock *sk = chan->sk; |
baa7e1fa | 978 | |
ecf61bdb | 979 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
4e8402a3 MH |
980 | sk->sk_err = err; |
981 | } | |
982 | ||
baa7e1fa | 983 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
984 | } |
985 | ||
986 | static void l2cap_info_timeout(unsigned long arg) | |
987 | { | |
988 | struct l2cap_conn *conn = (void *) arg; | |
989 | ||
984947dc | 990 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 991 | conn->info_ident = 0; |
984947dc | 992 | |
4e8402a3 MH |
993 | l2cap_conn_start(conn); |
994 | } | |
995 | ||
5d3de7df VCG |
996 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
997 | { | |
998 | struct l2cap_conn *conn = hcon->l2cap_data; | |
999 | struct l2cap_chan *chan, *l; | |
1000 | struct sock *sk; | |
1001 | ||
1002 | if (!conn) | |
1003 | return; | |
1004 | ||
1005 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1006 | ||
1007 | kfree_skb(conn->rx_skb); | |
1008 | ||
1009 | /* Kill channels */ | |
1010 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
1011 | sk = chan->sk; | |
1012 | bh_lock_sock(sk); | |
1013 | l2cap_chan_del(chan, err); | |
1014 | bh_unlock_sock(sk); | |
1015 | chan->ops->close(chan->data); | |
1016 | } | |
1017 | ||
73d80deb LAD |
1018 | hci_chan_del(conn->hchan); |
1019 | ||
5d3de7df VCG |
1020 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
1021 | del_timer_sync(&conn->info_timer); | |
1022 | ||
d26a2345 | 1023 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) { |
5d3de7df | 1024 | del_timer(&conn->security_timer); |
8aab4757 | 1025 | smp_chan_destroy(conn); |
d26a2345 | 1026 | } |
5d3de7df VCG |
1027 | |
1028 | hcon->l2cap_data = NULL; | |
1029 | kfree(conn); | |
1030 | } | |
1031 | ||
1032 | static void security_timeout(unsigned long arg) | |
1033 | { | |
1034 | struct l2cap_conn *conn = (void *) arg; | |
1035 | ||
1036 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1037 | } | |
1038 | ||
1da177e4 LT |
1039 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1040 | { | |
0139418c | 1041 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1042 | struct hci_chan *hchan; |
1da177e4 | 1043 | |
0139418c | 1044 | if (conn || status) |
1da177e4 LT |
1045 | return conn; |
1046 | ||
73d80deb LAD |
1047 | hchan = hci_chan_create(hcon); |
1048 | if (!hchan) | |
1049 | return NULL; | |
1050 | ||
0139418c | 1051 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1052 | if (!conn) { |
1053 | hci_chan_del(hchan); | |
1da177e4 | 1054 | return NULL; |
73d80deb | 1055 | } |
1da177e4 LT |
1056 | |
1057 | hcon->l2cap_data = conn; | |
1058 | conn->hcon = hcon; | |
73d80deb | 1059 | conn->hchan = hchan; |
1da177e4 | 1060 | |
73d80deb | 1061 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1062 | |
acd7d370 VT |
1063 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1064 | conn->mtu = hcon->hdev->le_mtu; | |
1065 | else | |
1066 | conn->mtu = hcon->hdev->acl_mtu; | |
1067 | ||
1da177e4 LT |
1068 | conn->src = &hcon->hdev->bdaddr; |
1069 | conn->dst = &hcon->dst; | |
1070 | ||
4e8402a3 MH |
1071 | conn->feat_mask = 0; |
1072 | ||
1da177e4 | 1073 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
1074 | rwlock_init(&conn->chan_lock); |
1075 | ||
1076 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1077 | |
5d3de7df VCG |
1078 | if (hcon->type == LE_LINK) |
1079 | setup_timer(&conn->security_timer, security_timeout, | |
1080 | (unsigned long) conn); | |
1081 | else | |
b62f328b | 1082 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
45054dc1 DY |
1083 | (unsigned long) conn); |
1084 | ||
9f5a0d7b | 1085 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1086 | |
1da177e4 LT |
1087 | return conn; |
1088 | } | |
1089 | ||
48454079 | 1090 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 1091 | { |
baa7e1fa | 1092 | write_lock_bh(&conn->chan_lock); |
48454079 | 1093 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 1094 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
1095 | } |
1096 | ||
1da177e4 | 1097 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1098 | |
1099 | /* Find socket with psm and source bdaddr. | |
1100 | * Returns closest match. | |
1101 | */ | |
23691d75 | 1102 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1103 | { |
23691d75 | 1104 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1105 | |
23691d75 | 1106 | read_lock(&chan_list_lock); |
e0f0cb56 | 1107 | |
23691d75 GP |
1108 | list_for_each_entry(c, &chan_list, global_l) { |
1109 | struct sock *sk = c->sk; | |
fe4128e0 | 1110 | |
89bc500e | 1111 | if (state && c->state != state) |
1da177e4 LT |
1112 | continue; |
1113 | ||
23691d75 | 1114 | if (c->psm == psm) { |
1da177e4 | 1115 | /* Exact match. */ |
23691d75 | 1116 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1117 | read_unlock(&chan_list_lock); |
23691d75 GP |
1118 | return c; |
1119 | } | |
1da177e4 LT |
1120 | |
1121 | /* Closest match */ | |
1122 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1123 | c1 = c; |
1da177e4 LT |
1124 | } |
1125 | } | |
1da177e4 | 1126 | |
23691d75 | 1127 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1128 | |
23691d75 | 1129 | return c1; |
1da177e4 LT |
1130 | } |
1131 | ||
77a74c7e | 1132 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 1133 | { |
5d41ce1d | 1134 | struct sock *sk = chan->sk; |
1da177e4 LT |
1135 | bdaddr_t *src = &bt_sk(sk)->src; |
1136 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1137 | struct l2cap_conn *conn; | |
1138 | struct hci_conn *hcon; | |
1139 | struct hci_dev *hdev; | |
09ab6f4c | 1140 | __u8 auth_type; |
44d0e48e | 1141 | int err; |
1da177e4 | 1142 | |
f29972de | 1143 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1144 | chan->psm); |
1da177e4 | 1145 | |
af05b30b GP |
1146 | hdev = hci_get_route(dst, src); |
1147 | if (!hdev) | |
1da177e4 LT |
1148 | return -EHOSTUNREACH; |
1149 | ||
1150 | hci_dev_lock_bh(hdev); | |
1151 | ||
4343478f | 1152 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1153 | |
fe4128e0 | 1154 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1155 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1156 | chan->sec_level, auth_type); |
acd7d370 VT |
1157 | else |
1158 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1159 | chan->sec_level, auth_type); |
acd7d370 | 1160 | |
30e76272 VT |
1161 | if (IS_ERR(hcon)) { |
1162 | err = PTR_ERR(hcon); | |
1da177e4 | 1163 | goto done; |
30e76272 | 1164 | } |
1da177e4 LT |
1165 | |
1166 | conn = l2cap_conn_add(hcon, 0); | |
1167 | if (!conn) { | |
1168 | hci_conn_put(hcon); | |
30e76272 | 1169 | err = -ENOMEM; |
1da177e4 LT |
1170 | goto done; |
1171 | } | |
1172 | ||
1da177e4 LT |
1173 | /* Update source addr of the socket */ |
1174 | bacpy(src, conn->src); | |
1175 | ||
48454079 GP |
1176 | l2cap_chan_add(conn, chan); |
1177 | ||
89bc500e | 1178 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1179 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1180 | |
1181 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1182 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1183 | __clear_chan_timer(chan); |
4343478f | 1184 | if (l2cap_check_security(chan)) |
89bc500e | 1185 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1186 | } else |
fc7f8a7e | 1187 | l2cap_do_start(chan); |
1da177e4 LT |
1188 | } |
1189 | ||
30e76272 VT |
1190 | err = 0; |
1191 | ||
1da177e4 LT |
1192 | done: |
1193 | hci_dev_unlock_bh(hdev); | |
1194 | hci_dev_put(hdev); | |
1195 | return err; | |
1196 | } | |
1197 | ||
dcba0dba | 1198 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1199 | { |
8c1d787b | 1200 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1201 | DECLARE_WAITQUEUE(wait, current); |
1202 | int err = 0; | |
1203 | int timeo = HZ/5; | |
1204 | ||
2b0b05dd | 1205 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1206 | set_current_state(TASK_INTERRUPTIBLE); |
1207 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1208 | if (!timeo) |
1209 | timeo = HZ/5; | |
1210 | ||
1211 | if (signal_pending(current)) { | |
1212 | err = sock_intr_errno(timeo); | |
1213 | break; | |
1214 | } | |
1215 | ||
1216 | release_sock(sk); | |
1217 | timeo = schedule_timeout(timeo); | |
1218 | lock_sock(sk); | |
a71a0cf4 | 1219 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1220 | |
1221 | err = sock_error(sk); | |
1222 | if (err) | |
1223 | break; | |
1224 | } | |
1225 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1226 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1227 | return err; |
1228 | } | |
1229 | ||
e90bac06 GP |
1230 | static void l2cap_monitor_timeout(unsigned long arg) |
1231 | { | |
525cd185 GP |
1232 | struct l2cap_chan *chan = (void *) arg; |
1233 | struct sock *sk = chan->sk; | |
e90bac06 | 1234 | |
525cd185 | 1235 | BT_DBG("chan %p", chan); |
0e98958d | 1236 | |
e686219a | 1237 | bh_lock_sock(sk); |
2c03a7a4 | 1238 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1239 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
b13f5860 | 1240 | bh_unlock_sock(sk); |
e90bac06 GP |
1241 | return; |
1242 | } | |
1243 | ||
6a026610 | 1244 | chan->retry_count++; |
1a09bcb9 | 1245 | __set_monitor_timer(chan); |
e90bac06 | 1246 | |
525cd185 | 1247 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1248 | bh_unlock_sock(sk); |
e90bac06 GP |
1249 | } |
1250 | ||
1251 | static void l2cap_retrans_timeout(unsigned long arg) | |
1252 | { | |
525cd185 GP |
1253 | struct l2cap_chan *chan = (void *) arg; |
1254 | struct sock *sk = chan->sk; | |
e90bac06 | 1255 | |
49208c9c | 1256 | BT_DBG("chan %p", chan); |
0e98958d | 1257 | |
e686219a | 1258 | bh_lock_sock(sk); |
6a026610 | 1259 | chan->retry_count = 1; |
1a09bcb9 | 1260 | __set_monitor_timer(chan); |
e90bac06 | 1261 | |
e2ab4353 | 1262 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1263 | |
525cd185 | 1264 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1265 | bh_unlock_sock(sk); |
e90bac06 GP |
1266 | } |
1267 | ||
42e5c802 | 1268 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1269 | { |
1c2acffb | 1270 | struct sk_buff *skb; |
1da177e4 | 1271 | |
58d35f87 | 1272 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1273 | chan->unacked_frames) { |
42e5c802 | 1274 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1275 | break; |
1da177e4 | 1276 | |
58d35f87 | 1277 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1278 | kfree_skb(skb); |
1da177e4 | 1279 | |
6a026610 | 1280 | chan->unacked_frames--; |
1c2acffb | 1281 | } |
1da177e4 | 1282 | |
6a026610 | 1283 | if (!chan->unacked_frames) |
1a09bcb9 | 1284 | __clear_retrans_timer(chan); |
1c2acffb | 1285 | } |
1da177e4 | 1286 | |
67c9e840 | 1287 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1288 | { |
ccbb84af | 1289 | struct sk_buff *skb; |
88843ab0 AE |
1290 | u32 control; |
1291 | u16 fcs; | |
6840ed07 | 1292 | |
58d35f87 | 1293 | while ((skb = skb_dequeue(&chan->tx_q))) { |
88843ab0 | 1294 | control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1295 | control |= __set_txseq(chan, chan->next_tx_seq); |
88843ab0 | 1296 | __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1297 | |
47d1ec61 | 1298 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1299 | fcs = crc16(0, (u8 *)skb->data, |
1300 | skb->len - L2CAP_FCS_SIZE); | |
1301 | put_unaligned_le16(fcs, | |
1302 | skb->data + skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1303 | } |
1304 | ||
4343478f | 1305 | l2cap_do_send(chan, skb); |
6840ed07 | 1306 | |
836be934 | 1307 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
6840ed07 | 1308 | } |
6840ed07 GP |
1309 | } |
1310 | ||
fb45de7d | 1311 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1312 | { |
8f17154f | 1313 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1314 | u16 fcs; |
1315 | u32 control; | |
8f17154f | 1316 | |
58d35f87 | 1317 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1318 | if (!skb) |
1319 | return; | |
8f17154f | 1320 | |
f11d676d GP |
1321 | do { |
1322 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1323 | break; |
8f17154f | 1324 | |
58d35f87 | 1325 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1326 | return; |
8f17154f | 1327 | |
58d35f87 | 1328 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1329 | |
2c03a7a4 GP |
1330 | if (chan->remote_max_tx && |
1331 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1332 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1333 | return; |
1334 | } | |
1335 | ||
1336 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1337 | bt_cb(skb)->retries++; | |
88843ab0 AE |
1338 | |
1339 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1340 | control &= __get_sar_mask(chan); |
3cb123d1 | 1341 | |
e2ab4353 | 1342 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1343 | control |= __set_ctrl_final(chan); |
95ffa978 | 1344 | |
0b209fae | 1345 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1346 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1347 | |
88843ab0 | 1348 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1349 | |
47d1ec61 | 1350 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1351 | fcs = crc16(0, (u8 *)tx_skb->data, |
1352 | tx_skb->len - L2CAP_FCS_SIZE); | |
1353 | put_unaligned_le16(fcs, | |
1354 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1355 | } |
1356 | ||
4343478f | 1357 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1358 | } |
1359 | ||
67c9e840 | 1360 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1361 | { |
1362 | struct sk_buff *skb, *tx_skb; | |
88843ab0 AE |
1363 | u16 fcs; |
1364 | u32 control; | |
9a9c6a34 | 1365 | int nsent = 0; |
1c2acffb | 1366 | |
89bc500e | 1367 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1368 | return -ENOTCONN; |
e90bac06 | 1369 | |
58d35f87 | 1370 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1371 | |
2c03a7a4 GP |
1372 | if (chan->remote_max_tx && |
1373 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1374 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1375 | break; |
1376 | } | |
1377 | ||
e420aba3 AE |
1378 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1379 | ||
e90bac06 GP |
1380 | bt_cb(skb)->retries++; |
1381 | ||
88843ab0 | 1382 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1383 | control &= __get_sar_mask(chan); |
95ffa978 | 1384 | |
e2ab4353 | 1385 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1386 | control |= __set_ctrl_final(chan); |
e2ab4353 | 1387 | |
0b209fae | 1388 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1389 | control |= __set_txseq(chan, chan->next_tx_seq); |
1c2acffb | 1390 | |
88843ab0 | 1391 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
e90bac06 | 1392 | |
47d1ec61 | 1393 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1394 | fcs = crc16(0, (u8 *)skb->data, |
1395 | tx_skb->len - L2CAP_FCS_SIZE); | |
1396 | put_unaligned_le16(fcs, skb->data + | |
1397 | tx_skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1398 | } |
1399 | ||
4343478f | 1400 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1401 | |
1a09bcb9 | 1402 | __set_retrans_timer(chan); |
1c2acffb | 1403 | |
42e5c802 | 1404 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
836be934 AE |
1405 | |
1406 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
1c2acffb | 1407 | |
23e9fde2 | 1408 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1409 | chan->unacked_frames++; |
23e9fde2 | 1410 | |
6a026610 | 1411 | chan->frames_sent++; |
1c2acffb | 1412 | |
58d35f87 GP |
1413 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1414 | chan->tx_send_head = NULL; | |
1c2acffb | 1415 | else |
58d35f87 | 1416 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1417 | |
1418 | nsent++; | |
1c2acffb GP |
1419 | } |
1420 | ||
9e917af1 GP |
1421 | return nsent; |
1422 | } | |
1423 | ||
525cd185 | 1424 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1425 | { |
dfc909be GP |
1426 | int ret; |
1427 | ||
58d35f87 GP |
1428 | if (!skb_queue_empty(&chan->tx_q)) |
1429 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1430 | |
42e5c802 | 1431 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1432 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1433 | return ret; |
1434 | } | |
1435 | ||
525cd185 | 1436 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1437 | { |
88843ab0 | 1438 | u32 control = 0; |
9e917af1 | 1439 | |
0b209fae | 1440 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1441 | |
e2ab4353 | 1442 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1443 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1444 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1445 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1446 | return; |
9e917af1 | 1447 | } |
dfc909be | 1448 | |
525cd185 | 1449 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1450 | return; |
1451 | ||
ab784b73 | 1452 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1453 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1454 | } |
1455 | ||
525cd185 | 1456 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1457 | { |
1458 | struct srej_list *tail; | |
88843ab0 | 1459 | u32 control; |
99b0d4b7 | 1460 | |
ab784b73 | 1461 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1462 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1463 | |
39d5a3ee | 1464 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1465 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1466 | |
525cd185 | 1467 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1468 | } |
1469 | ||
1c2acffb GP |
1470 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1471 | { | |
8c1d787b | 1472 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1473 | struct sk_buff **frag; |
1474 | int err, sent = 0; | |
1da177e4 | 1475 | |
59203a21 | 1476 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1477 | return -EFAULT; |
1da177e4 LT |
1478 | |
1479 | sent += count; | |
1480 | len -= count; | |
1481 | ||
1482 | /* Continuation fragments (no L2CAP header) */ | |
1483 | frag = &skb_shinfo(skb)->frag_list; | |
1484 | while (len) { | |
1485 | count = min_t(unsigned int, conn->mtu, len); | |
1486 | ||
1487 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1488 | if (!*frag) | |
0175d629 | 1489 | return err; |
1c2acffb GP |
1490 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1491 | return -EFAULT; | |
1da177e4 | 1492 | |
5e59b791 LAD |
1493 | (*frag)->priority = skb->priority; |
1494 | ||
1da177e4 LT |
1495 | sent += count; |
1496 | len -= count; | |
1497 | ||
1498 | frag = &(*frag)->next; | |
1499 | } | |
1da177e4 LT |
1500 | |
1501 | return sent; | |
1c2acffb | 1502 | } |
1da177e4 | 1503 | |
5e59b791 LAD |
1504 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1505 | struct msghdr *msg, size_t len, | |
1506 | u32 priority) | |
1c2acffb | 1507 | { |
fe4128e0 | 1508 | struct sock *sk = chan->sk; |
8c1d787b | 1509 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1510 | struct sk_buff *skb; |
03a51213 | 1511 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1512 | struct l2cap_hdr *lh; |
1513 | ||
5e59b791 | 1514 | BT_DBG("sk %p len %d priority %u", sk, (int)len, priority); |
1c2acffb GP |
1515 | |
1516 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1517 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1518 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1519 | if (!skb) | |
0175d629 | 1520 | return ERR_PTR(err); |
1c2acffb | 1521 | |
5e59b791 LAD |
1522 | skb->priority = priority; |
1523 | ||
1c2acffb GP |
1524 | /* Create L2CAP header */ |
1525 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1526 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1527 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1528 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1529 | |
1530 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1531 | if (unlikely(err < 0)) { | |
1532 | kfree_skb(skb); | |
1533 | return ERR_PTR(err); | |
1534 | } | |
1535 | return skb; | |
1536 | } | |
1537 | ||
5e59b791 LAD |
1538 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1539 | struct msghdr *msg, size_t len, | |
1540 | u32 priority) | |
1c2acffb | 1541 | { |
fe4128e0 | 1542 | struct sock *sk = chan->sk; |
8c1d787b | 1543 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1544 | struct sk_buff *skb; |
1545 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1546 | struct l2cap_hdr *lh; | |
1547 | ||
1548 | BT_DBG("sk %p len %d", sk, (int)len); | |
1549 | ||
1550 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1551 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1552 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1553 | if (!skb) | |
0175d629 | 1554 | return ERR_PTR(err); |
1c2acffb | 1555 | |
5e59b791 LAD |
1556 | skb->priority = priority; |
1557 | ||
1c2acffb GP |
1558 | /* Create L2CAP header */ |
1559 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1560 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1561 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1562 | ||
1563 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1564 | if (unlikely(err < 0)) { | |
1565 | kfree_skb(skb); | |
1566 | return ERR_PTR(err); | |
1567 | } | |
1568 | return skb; | |
1569 | } | |
1570 | ||
ab0ff76d LAD |
1571 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1572 | struct msghdr *msg, size_t len, | |
88843ab0 | 1573 | u32 control, u16 sdulen) |
1c2acffb | 1574 | { |
47d1ec61 | 1575 | struct sock *sk = chan->sk; |
8c1d787b | 1576 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1577 | struct sk_buff *skb; |
e4ca6d98 | 1578 | int err, count, hlen; |
1c2acffb GP |
1579 | struct l2cap_hdr *lh; |
1580 | ||
1581 | BT_DBG("sk %p len %d", sk, (int)len); | |
1582 | ||
0ee0d208 GP |
1583 | if (!conn) |
1584 | return ERR_PTR(-ENOTCONN); | |
1585 | ||
e4ca6d98 AE |
1586 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1587 | hlen = L2CAP_EXT_HDR_SIZE; | |
1588 | else | |
1589 | hlen = L2CAP_ENH_HDR_SIZE; | |
1590 | ||
c74e560c | 1591 | if (sdulen) |
03a51213 | 1592 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1593 | |
47d1ec61 | 1594 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1595 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1596 | |
1c2acffb GP |
1597 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1598 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1599 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1600 | if (!skb) | |
0175d629 | 1601 | return ERR_PTR(err); |
1c2acffb GP |
1602 | |
1603 | /* Create L2CAP header */ | |
1604 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1605 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1606 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 AE |
1607 | |
1608 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1609 | ||
c74e560c | 1610 | if (sdulen) |
03a51213 | 1611 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb GP |
1612 | |
1613 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1614 | if (unlikely(err < 0)) { | |
1615 | kfree_skb(skb); | |
1616 | return ERR_PTR(err); | |
1617 | } | |
e90bac06 | 1618 | |
47d1ec61 | 1619 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1620 | put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE)); |
fcc203c3 | 1621 | |
e90bac06 | 1622 | bt_cb(skb)->retries = 0; |
1c2acffb | 1623 | return skb; |
1da177e4 LT |
1624 | } |
1625 | ||
67c9e840 | 1626 | static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1627 | { |
c74e560c GP |
1628 | struct sk_buff *skb; |
1629 | struct sk_buff_head sar_queue; | |
88843ab0 | 1630 | u32 control; |
c74e560c GP |
1631 | size_t size = 0; |
1632 | ||
ff12fd64 | 1633 | skb_queue_head_init(&sar_queue); |
7e0ef6ee | 1634 | control = __set_ctrl_sar(chan, L2CAP_SAR_START); |
47d1ec61 | 1635 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1636 | if (IS_ERR(skb)) |
1637 | return PTR_ERR(skb); | |
1638 | ||
1639 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1640 | len -= chan->remote_mps; |
1641 | size += chan->remote_mps; | |
c74e560c GP |
1642 | |
1643 | while (len > 0) { | |
1644 | size_t buflen; | |
1645 | ||
2c03a7a4 | 1646 | if (len > chan->remote_mps) { |
7e0ef6ee | 1647 | control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE); |
2c03a7a4 | 1648 | buflen = chan->remote_mps; |
c74e560c | 1649 | } else { |
7e0ef6ee | 1650 | control = __set_ctrl_sar(chan, L2CAP_SAR_END); |
c74e560c GP |
1651 | buflen = len; |
1652 | } | |
1653 | ||
47d1ec61 | 1654 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1655 | if (IS_ERR(skb)) { |
1656 | skb_queue_purge(&sar_queue); | |
1657 | return PTR_ERR(skb); | |
1658 | } | |
1659 | ||
1660 | __skb_queue_tail(&sar_queue, skb); | |
1661 | len -= buflen; | |
1662 | size += buflen; | |
c74e560c | 1663 | } |
58d35f87 GP |
1664 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1665 | if (chan->tx_send_head == NULL) | |
1666 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1667 | |
1668 | return size; | |
1669 | } | |
1670 | ||
5e59b791 LAD |
1671 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
1672 | u32 priority) | |
9a91a04a | 1673 | { |
9a91a04a | 1674 | struct sk_buff *skb; |
88843ab0 | 1675 | u32 control; |
9a91a04a GP |
1676 | int err; |
1677 | ||
1678 | /* Connectionless channel */ | |
715ec005 | 1679 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 1680 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
1681 | if (IS_ERR(skb)) |
1682 | return PTR_ERR(skb); | |
1683 | ||
1684 | l2cap_do_send(chan, skb); | |
1685 | return len; | |
1686 | } | |
1687 | ||
1688 | switch (chan->mode) { | |
1689 | case L2CAP_MODE_BASIC: | |
1690 | /* Check outgoing MTU */ | |
1691 | if (len > chan->omtu) | |
1692 | return -EMSGSIZE; | |
1693 | ||
1694 | /* Create a basic PDU */ | |
5e59b791 | 1695 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
1696 | if (IS_ERR(skb)) |
1697 | return PTR_ERR(skb); | |
1698 | ||
1699 | l2cap_do_send(chan, skb); | |
1700 | err = len; | |
1701 | break; | |
1702 | ||
1703 | case L2CAP_MODE_ERTM: | |
1704 | case L2CAP_MODE_STREAMING: | |
1705 | /* Entire SDU fits into one PDU */ | |
1706 | if (len <= chan->remote_mps) { | |
7e0ef6ee | 1707 | control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED); |
9a91a04a GP |
1708 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, |
1709 | 0); | |
1710 | if (IS_ERR(skb)) | |
1711 | return PTR_ERR(skb); | |
1712 | ||
1713 | __skb_queue_tail(&chan->tx_q, skb); | |
1714 | ||
1715 | if (chan->tx_send_head == NULL) | |
1716 | chan->tx_send_head = skb; | |
1717 | ||
1718 | } else { | |
1719 | /* Segment SDU into multiples PDUs */ | |
1720 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1721 | if (err < 0) | |
1722 | return err; | |
1723 | } | |
1724 | ||
1725 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1726 | l2cap_streaming_send(chan); | |
1727 | err = len; | |
1728 | break; | |
1729 | } | |
1730 | ||
e2ab4353 GP |
1731 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1732 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1733 | err = len; |
1734 | break; | |
1735 | } | |
1736 | ||
1737 | err = l2cap_ertm_send(chan); | |
1738 | if (err >= 0) | |
1739 | err = len; | |
1740 | ||
1741 | break; | |
1742 | ||
1743 | default: | |
1744 | BT_DBG("bad state %1.1x", chan->mode); | |
1745 | err = -EBADFD; | |
1746 | } | |
1747 | ||
1748 | return err; | |
1749 | } | |
1750 | ||
1da177e4 LT |
1751 | /* Copy frame to all raw sockets on that connection */ |
1752 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1753 | { | |
1da177e4 | 1754 | struct sk_buff *nskb; |
48454079 | 1755 | struct l2cap_chan *chan; |
1da177e4 LT |
1756 | |
1757 | BT_DBG("conn %p", conn); | |
1758 | ||
baa7e1fa GP |
1759 | read_lock(&conn->chan_lock); |
1760 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1761 | struct sock *sk = chan->sk; |
715ec005 | 1762 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1763 | continue; |
1764 | ||
1765 | /* Don't send frame to the socket it came from */ | |
1766 | if (skb->sk == sk) | |
1767 | continue; | |
af05b30b GP |
1768 | nskb = skb_clone(skb, GFP_ATOMIC); |
1769 | if (!nskb) | |
1da177e4 LT |
1770 | continue; |
1771 | ||
23070494 | 1772 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1773 | kfree_skb(nskb); |
1774 | } | |
baa7e1fa | 1775 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1776 | } |
1777 | ||
1778 | /* ---- L2CAP signalling commands ---- */ | |
1779 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1780 | u8 code, u8 ident, u16 dlen, void *data) | |
1781 | { | |
1782 | struct sk_buff *skb, **frag; | |
1783 | struct l2cap_cmd_hdr *cmd; | |
1784 | struct l2cap_hdr *lh; | |
1785 | int len, count; | |
1786 | ||
af05b30b GP |
1787 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1788 | conn, code, ident, dlen); | |
1da177e4 LT |
1789 | |
1790 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1791 | count = min_t(unsigned int, conn->mtu, len); | |
1792 | ||
1793 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1794 | if (!skb) | |
1795 | return NULL; | |
1796 | ||
1797 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1798 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1799 | |
1800 | if (conn->hcon->type == LE_LINK) | |
1801 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1802 | else | |
1803 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1804 | |
1805 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1806 | cmd->code = code; | |
1807 | cmd->ident = ident; | |
aca3192c | 1808 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1809 | |
1810 | if (dlen) { | |
1811 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1812 | memcpy(skb_put(skb, count), data, count); | |
1813 | data += count; | |
1814 | } | |
1815 | ||
1816 | len -= skb->len; | |
1817 | ||
1818 | /* Continuation fragments (no L2CAP header) */ | |
1819 | frag = &skb_shinfo(skb)->frag_list; | |
1820 | while (len) { | |
1821 | count = min_t(unsigned int, conn->mtu, len); | |
1822 | ||
1823 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1824 | if (!*frag) | |
1825 | goto fail; | |
1826 | ||
1827 | memcpy(skb_put(*frag, count), data, count); | |
1828 | ||
1829 | len -= count; | |
1830 | data += count; | |
1831 | ||
1832 | frag = &(*frag)->next; | |
1833 | } | |
1834 | ||
1835 | return skb; | |
1836 | ||
1837 | fail: | |
1838 | kfree_skb(skb); | |
1839 | return NULL; | |
1840 | } | |
1841 | ||
1842 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1843 | { | |
1844 | struct l2cap_conf_opt *opt = *ptr; | |
1845 | int len; | |
1846 | ||
1847 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1848 | *ptr += len; | |
1849 | ||
1850 | *type = opt->type; | |
1851 | *olen = opt->len; | |
1852 | ||
1853 | switch (opt->len) { | |
1854 | case 1: | |
1855 | *val = *((u8 *) opt->val); | |
1856 | break; | |
1857 | ||
1858 | case 2: | |
bfaaeb3e | 1859 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1860 | break; |
1861 | ||
1862 | case 4: | |
bfaaeb3e | 1863 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1864 | break; |
1865 | ||
1866 | default: | |
1867 | *val = (unsigned long) opt->val; | |
1868 | break; | |
1869 | } | |
1870 | ||
1871 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1872 | return len; | |
1873 | } | |
1874 | ||
1da177e4 LT |
1875 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1876 | { | |
1877 | struct l2cap_conf_opt *opt = *ptr; | |
1878 | ||
1879 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1880 | ||
1881 | opt->type = type; | |
1882 | opt->len = len; | |
1883 | ||
1884 | switch (len) { | |
1885 | case 1: | |
1886 | *((u8 *) opt->val) = val; | |
1887 | break; | |
1888 | ||
1889 | case 2: | |
4f8b691c | 1890 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1891 | break; |
1892 | ||
1893 | case 4: | |
4f8b691c | 1894 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1895 | break; |
1896 | ||
1897 | default: | |
1898 | memcpy(opt->val, (void *) val, len); | |
1899 | break; | |
1900 | } | |
1901 | ||
1902 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1903 | } | |
1904 | ||
f89cef09 AE |
1905 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
1906 | { | |
1907 | struct l2cap_conf_efs efs; | |
1908 | ||
1909 | switch(chan->mode) { | |
1910 | case L2CAP_MODE_ERTM: | |
1911 | efs.id = chan->local_id; | |
1912 | efs.stype = chan->local_stype; | |
1913 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1914 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1915 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
1916 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
1917 | break; | |
1918 | ||
1919 | case L2CAP_MODE_STREAMING: | |
1920 | efs.id = 1; | |
1921 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
1922 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1923 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1924 | efs.acc_lat = 0; | |
1925 | efs.flush_to = 0; | |
1926 | break; | |
1927 | ||
1928 | default: | |
1929 | return; | |
1930 | } | |
1931 | ||
1932 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
1933 | (unsigned long) &efs); | |
1934 | } | |
1935 | ||
c1b4f43b GP |
1936 | static void l2cap_ack_timeout(unsigned long arg) |
1937 | { | |
525cd185 | 1938 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1939 | |
525cd185 GP |
1940 | bh_lock_sock(chan->sk); |
1941 | l2cap_send_ack(chan); | |
1942 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1943 | } |
1944 | ||
525cd185 | 1945 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1946 | { |
525cd185 GP |
1947 | struct sock *sk = chan->sk; |
1948 | ||
42e5c802 | 1949 | chan->expected_ack_seq = 0; |
6a026610 | 1950 | chan->unacked_frames = 0; |
42e5c802 | 1951 | chan->buffer_seq = 0; |
6a026610 GP |
1952 | chan->num_acked = 0; |
1953 | chan->frames_sent = 0; | |
0565c1c2 | 1954 | |
e92c8e70 GP |
1955 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1956 | (unsigned long) chan); | |
1957 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1958 | (unsigned long) chan); | |
1959 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1960 | |
f1c6775b | 1961 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 1962 | |
39d5a3ee GP |
1963 | INIT_LIST_HEAD(&chan->srej_l); |
1964 | ||
218bb9df GP |
1965 | |
1966 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1967 | } |
1968 | ||
f2fcfcd6 GP |
1969 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1970 | { | |
1971 | switch (mode) { | |
1972 | case L2CAP_MODE_STREAMING: | |
1973 | case L2CAP_MODE_ERTM: | |
1974 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1975 | return mode; | |
1976 | /* fall through */ | |
1977 | default: | |
1978 | return L2CAP_MODE_BASIC; | |
1979 | } | |
1980 | } | |
1981 | ||
6327eb98 AE |
1982 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
1983 | { | |
1984 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
1985 | } | |
1986 | ||
f89cef09 AE |
1987 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
1988 | { | |
1989 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
1990 | } | |
1991 | ||
6327eb98 AE |
1992 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
1993 | { | |
1994 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 1995 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
1996 | /* use extended control field */ |
1997 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
1998 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
1999 | } else { | |
6327eb98 AE |
2000 | chan->tx_win = min_t(u16, chan->tx_win, |
2001 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2002 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2003 | } | |
6327eb98 AE |
2004 | } |
2005 | ||
710f9b0a | 2006 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2007 | { |
1da177e4 | 2008 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2009 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2010 | void *ptr = req->data; |
c8f79162 | 2011 | u16 size; |
1da177e4 | 2012 | |
49208c9c | 2013 | BT_DBG("chan %p", chan); |
1da177e4 | 2014 | |
73ffa904 | 2015 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2016 | goto done; |
2017 | ||
0c1bc5c6 | 2018 | switch (chan->mode) { |
f2fcfcd6 GP |
2019 | case L2CAP_MODE_STREAMING: |
2020 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2021 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2022 | break; |
85eb53c6 | 2023 | |
f89cef09 AE |
2024 | if (__l2cap_efs_supported(chan)) |
2025 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2026 | ||
2ba13ed6 | 2027 | /* fall through */ |
f2fcfcd6 | 2028 | default: |
8c1d787b | 2029 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2030 | break; |
2031 | } | |
2032 | ||
2033 | done: | |
0c1bc5c6 GP |
2034 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2035 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2036 | |
0c1bc5c6 | 2037 | switch (chan->mode) { |
65c7c491 | 2038 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2039 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2040 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2041 | break; |
2042 | ||
62547752 GP |
2043 | rfc.mode = L2CAP_MODE_BASIC; |
2044 | rfc.txwin_size = 0; | |
2045 | rfc.max_transmit = 0; | |
2046 | rfc.retrans_timeout = 0; | |
2047 | rfc.monitor_timeout = 0; | |
2048 | rfc.max_pdu_size = 0; | |
2049 | ||
63406504 GP |
2050 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2051 | (unsigned long) &rfc); | |
65c7c491 MH |
2052 | break; |
2053 | ||
2054 | case L2CAP_MODE_ERTM: | |
2055 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2056 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2057 | rfc.retrans_timeout = 0; |
2058 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2059 | |
2060 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2061 | L2CAP_EXT_HDR_SIZE - | |
2062 | L2CAP_SDULEN_SIZE - | |
2063 | L2CAP_FCS_SIZE); | |
2064 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2065 | |
6327eb98 AE |
2066 | l2cap_txwin_setup(chan); |
2067 | ||
2068 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2069 | L2CAP_DEFAULT_TX_WINDOW); | |
2070 | ||
63406504 GP |
2071 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2072 | (unsigned long) &rfc); | |
2073 | ||
f89cef09 AE |
2074 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2075 | l2cap_add_opt_efs(&ptr, chan); | |
2076 | ||
8c1d787b | 2077 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2078 | break; |
2079 | ||
47d1ec61 | 2080 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2081 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2082 | chan->fcs = L2CAP_FCS_NONE; |
2083 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2084 | } |
6327eb98 AE |
2085 | |
2086 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2087 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2088 | chan->tx_win); | |
f2fcfcd6 GP |
2089 | break; |
2090 | ||
2091 | case L2CAP_MODE_STREAMING: | |
2092 | rfc.mode = L2CAP_MODE_STREAMING; | |
2093 | rfc.txwin_size = 0; | |
2094 | rfc.max_transmit = 0; | |
2095 | rfc.retrans_timeout = 0; | |
2096 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2097 | |
2098 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2099 | L2CAP_EXT_HDR_SIZE - | |
2100 | L2CAP_SDULEN_SIZE - | |
2101 | L2CAP_FCS_SIZE); | |
2102 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2103 | |
63406504 GP |
2104 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2105 | (unsigned long) &rfc); | |
2106 | ||
f89cef09 AE |
2107 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2108 | l2cap_add_opt_efs(&ptr, chan); | |
2109 | ||
8c1d787b | 2110 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2111 | break; |
2112 | ||
47d1ec61 | 2113 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2114 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2115 | chan->fcs = L2CAP_FCS_NONE; |
2116 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2117 | } |
65c7c491 MH |
2118 | break; |
2119 | } | |
1da177e4 | 2120 | |
fe4128e0 | 2121 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2122 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2123 | |
2124 | return ptr - data; | |
2125 | } | |
2126 | ||
73ffa904 | 2127 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2128 | { |
5dee9e7c MH |
2129 | struct l2cap_conf_rsp *rsp = data; |
2130 | void *ptr = rsp->data; | |
73ffa904 GP |
2131 | void *req = chan->conf_req; |
2132 | int len = chan->conf_len; | |
5dee9e7c MH |
2133 | int type, hint, olen; |
2134 | unsigned long val; | |
6464f35f | 2135 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2136 | struct l2cap_conf_efs efs; |
2137 | u8 remote_efs = 0; | |
861d6882 | 2138 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2139 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2140 | u16 size; |
1da177e4 | 2141 | |
73ffa904 | 2142 | BT_DBG("chan %p", chan); |
820ae1b8 | 2143 | |
5dee9e7c MH |
2144 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2145 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2146 | |
589d2746 | 2147 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2148 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2149 | |
2150 | switch (type) { | |
2151 | case L2CAP_CONF_MTU: | |
861d6882 | 2152 | mtu = val; |
5dee9e7c MH |
2153 | break; |
2154 | ||
2155 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2156 | chan->flush_to = val; |
5dee9e7c MH |
2157 | break; |
2158 | ||
2159 | case L2CAP_CONF_QOS: | |
2160 | break; | |
2161 | ||
6464f35f MH |
2162 | case L2CAP_CONF_RFC: |
2163 | if (olen == sizeof(rfc)) | |
2164 | memcpy(&rfc, (void *) val, olen); | |
2165 | break; | |
2166 | ||
fcc203c3 GP |
2167 | case L2CAP_CONF_FCS: |
2168 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2169 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2170 | break; |
fcc203c3 | 2171 | |
42dceae2 AE |
2172 | case L2CAP_CONF_EFS: |
2173 | remote_efs = 1; | |
2174 | if (olen == sizeof(efs)) | |
2175 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2176 | break; |
2177 | ||
6327eb98 AE |
2178 | case L2CAP_CONF_EWS: |
2179 | if (!enable_hs) | |
2180 | return -ECONNREFUSED; | |
2181 | ||
2182 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
2183 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2184 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 AE |
2185 | chan->remote_tx_win = val; |
2186 | break; | |
2187 | ||
5dee9e7c MH |
2188 | default: |
2189 | if (hint) | |
2190 | break; | |
2191 | ||
2192 | result = L2CAP_CONF_UNKNOWN; | |
2193 | *((u8 *) ptr++) = type; | |
2194 | break; | |
2195 | } | |
2196 | } | |
2197 | ||
73ffa904 | 2198 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2199 | goto done; |
2200 | ||
0c1bc5c6 | 2201 | switch (chan->mode) { |
f2fcfcd6 GP |
2202 | case L2CAP_MODE_STREAMING: |
2203 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2204 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2205 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2206 | chan->conn->feat_mask); |
85eb53c6 GP |
2207 | break; |
2208 | } | |
2209 | ||
42dceae2 AE |
2210 | if (remote_efs) { |
2211 | if (__l2cap_efs_supported(chan)) | |
2212 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2213 | else | |
2214 | return -ECONNREFUSED; | |
2215 | } | |
2216 | ||
0c1bc5c6 | 2217 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2218 | return -ECONNREFUSED; |
742e519b | 2219 | |
f2fcfcd6 | 2220 | break; |
f2fcfcd6 GP |
2221 | } |
2222 | ||
2223 | done: | |
0c1bc5c6 | 2224 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2225 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2226 | rfc.mode = chan->mode; |
f2fcfcd6 | 2227 | |
73ffa904 | 2228 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2229 | return -ECONNREFUSED; |
2230 | ||
2231 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2232 | sizeof(rfc), (unsigned long) &rfc); | |
2233 | } | |
2234 | ||
5dee9e7c MH |
2235 | if (result == L2CAP_CONF_SUCCESS) { |
2236 | /* Configure output options and let the other side know | |
2237 | * which ones we don't like. */ | |
2238 | ||
f2fcfcd6 GP |
2239 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2240 | result = L2CAP_CONF_UNACCEPT; | |
2241 | else { | |
0c1bc5c6 | 2242 | chan->omtu = mtu; |
c1360a1c | 2243 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2244 | } |
0c1bc5c6 | 2245 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2246 | |
42dceae2 AE |
2247 | if (remote_efs) { |
2248 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2249 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2250 | efs.stype != chan->local_stype) { | |
2251 | ||
2252 | result = L2CAP_CONF_UNACCEPT; | |
2253 | ||
2254 | if (chan->num_conf_req >= 1) | |
2255 | return -ECONNREFUSED; | |
2256 | ||
2257 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2258 | sizeof(efs), |
42dceae2 | 2259 | (unsigned long) &efs); |
0e8b207e | 2260 | } else { |
3e6b3b95 | 2261 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2262 | result = L2CAP_CONF_PENDING; |
2263 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2264 | } |
2265 | } | |
2266 | ||
f2fcfcd6 GP |
2267 | switch (rfc.mode) { |
2268 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2269 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2270 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2271 | break; |
2272 | ||
2273 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2274 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2275 | chan->remote_tx_win = rfc.txwin_size; | |
2276 | else | |
2277 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
2278 | ||
2c03a7a4 | 2279 | chan->remote_max_tx = rfc.max_transmit; |
86b1b263 | 2280 | |
c8f79162 AE |
2281 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2282 | chan->conn->mtu - | |
2283 | L2CAP_EXT_HDR_SIZE - | |
2284 | L2CAP_SDULEN_SIZE - | |
2285 | L2CAP_FCS_SIZE); | |
2286 | rfc.max_pdu_size = cpu_to_le16(size); | |
2287 | chan->remote_mps = size; | |
f2fcfcd6 | 2288 | |
10467e9e GP |
2289 | rfc.retrans_timeout = |
2290 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2291 | rfc.monitor_timeout = | |
2292 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2293 | |
c1360a1c | 2294 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2295 | |
2296 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2297 | sizeof(rfc), (unsigned long) &rfc); | |
2298 | ||
42dceae2 AE |
2299 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2300 | chan->remote_id = efs.id; | |
2301 | chan->remote_stype = efs.stype; | |
2302 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2303 | chan->remote_flush_to = | |
2304 | le32_to_cpu(efs.flush_to); | |
2305 | chan->remote_acc_lat = | |
2306 | le32_to_cpu(efs.acc_lat); | |
2307 | chan->remote_sdu_itime = | |
2308 | le32_to_cpu(efs.sdu_itime); | |
2309 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2310 | sizeof(efs), (unsigned long) &efs); | |
2311 | } | |
f2fcfcd6 GP |
2312 | break; |
2313 | ||
2314 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2315 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2316 | chan->conn->mtu - | |
2317 | L2CAP_EXT_HDR_SIZE - | |
2318 | L2CAP_SDULEN_SIZE - | |
2319 | L2CAP_FCS_SIZE); | |
2320 | rfc.max_pdu_size = cpu_to_le16(size); | |
2321 | chan->remote_mps = size; | |
f2fcfcd6 | 2322 | |
c1360a1c | 2323 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2324 | |
2325 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2326 | sizeof(rfc), (unsigned long) &rfc); | |
2327 | ||
f2fcfcd6 GP |
2328 | break; |
2329 | ||
2330 | default: | |
5dee9e7c | 2331 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2332 | |
6464f35f | 2333 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2334 | rfc.mode = chan->mode; |
f2fcfcd6 | 2335 | } |
6464f35f | 2336 | |
f2fcfcd6 | 2337 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2338 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2339 | } |
fe4128e0 | 2340 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2341 | rsp->result = cpu_to_le16(result); |
2342 | rsp->flags = cpu_to_le16(0x0000); | |
2343 | ||
2344 | return ptr - data; | |
1da177e4 LT |
2345 | } |
2346 | ||
b4450035 | 2347 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2348 | { |
f2fcfcd6 GP |
2349 | struct l2cap_conf_req *req = data; |
2350 | void *ptr = req->data; | |
2351 | int type, olen; | |
2352 | unsigned long val; | |
2353 | struct l2cap_conf_rfc rfc; | |
2354 | ||
fe4128e0 | 2355 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2356 | |
2357 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2358 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2359 | ||
2360 | switch (type) { | |
2361 | case L2CAP_CONF_MTU: | |
2362 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2363 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2364 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2365 | } else |
0c1bc5c6 GP |
2366 | chan->imtu = val; |
2367 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2368 | break; |
2369 | ||
2370 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2371 | chan->flush_to = val; |
f2fcfcd6 | 2372 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2373 | 2, chan->flush_to); |
f2fcfcd6 GP |
2374 | break; |
2375 | ||
2376 | case L2CAP_CONF_RFC: | |
2377 | if (olen == sizeof(rfc)) | |
2378 | memcpy(&rfc, (void *)val, olen); | |
2379 | ||
c1360a1c | 2380 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2381 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2382 | return -ECONNREFUSED; |
2383 | ||
47d1ec61 | 2384 | chan->fcs = 0; |
f2fcfcd6 GP |
2385 | |
2386 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2387 | sizeof(rfc), (unsigned long) &rfc); | |
2388 | break; | |
6327eb98 AE |
2389 | |
2390 | case L2CAP_CONF_EWS: | |
2391 | chan->tx_win = min_t(u16, val, | |
2392 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
2393 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
2394 | chan->tx_win); | |
6327eb98 | 2395 | break; |
f2fcfcd6 GP |
2396 | } |
2397 | } | |
2398 | ||
0c1bc5c6 | 2399 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2400 | return -ECONNREFUSED; |
2401 | ||
0c1bc5c6 | 2402 | chan->mode = rfc.mode; |
6c2ea7a8 | 2403 | |
0e8b207e | 2404 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
2405 | switch (rfc.mode) { |
2406 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2407 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2408 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2409 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2410 | break; |
2411 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2412 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2413 | } |
2414 | } | |
2415 | ||
fe4128e0 | 2416 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2417 | req->flags = cpu_to_le16(0x0000); |
2418 | ||
2419 | return ptr - data; | |
2420 | } | |
2421 | ||
fe4128e0 | 2422 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2423 | { |
2424 | struct l2cap_conf_rsp *rsp = data; | |
2425 | void *ptr = rsp->data; | |
1da177e4 | 2426 | |
fe4128e0 | 2427 | BT_DBG("chan %p", chan); |
1da177e4 | 2428 | |
fe4128e0 | 2429 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2430 | rsp->result = cpu_to_le16(result); |
aca3192c | 2431 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2432 | |
2433 | return ptr - data; | |
2434 | } | |
2435 | ||
8c1d787b | 2436 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2437 | { |
2438 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2439 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2440 | u8 buf[128]; |
2441 | ||
fe4128e0 GP |
2442 | rsp.scid = cpu_to_le16(chan->dcid); |
2443 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2444 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2445 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2446 | l2cap_send_cmd(conn, chan->ident, | |
2447 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2448 | ||
c1360a1c | 2449 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2450 | return; |
2451 | ||
710f9b0a GP |
2452 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2453 | l2cap_build_conf_req(chan, buf), buf); | |
2454 | chan->num_conf_req++; | |
2455 | } | |
2456 | ||
47d1ec61 | 2457 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2458 | { |
7b1c0049 GP |
2459 | int type, olen; |
2460 | unsigned long val; | |
2461 | struct l2cap_conf_rfc rfc; | |
2462 | ||
47d1ec61 | 2463 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2464 | |
0c1bc5c6 | 2465 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2466 | return; |
2467 | ||
2468 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2469 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2470 | ||
2471 | switch (type) { | |
2472 | case L2CAP_CONF_RFC: | |
2473 | if (olen == sizeof(rfc)) | |
2474 | memcpy(&rfc, (void *)val, olen); | |
2475 | goto done; | |
2476 | } | |
2477 | } | |
2478 | ||
2479 | done: | |
2480 | switch (rfc.mode) { | |
2481 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2482 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2483 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2484 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2485 | break; |
2486 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2487 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2488 | } |
2489 | } | |
2490 | ||
4e8402a3 MH |
2491 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2492 | { | |
e2fd318e | 2493 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2494 | |
e2fd318e | 2495 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2496 | return 0; |
2497 | ||
2498 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2499 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2500 | del_timer(&conn->info_timer); |
984947dc MH |
2501 | |
2502 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2503 | conn->info_ident = 0; |
984947dc | 2504 | |
4e8402a3 MH |
2505 | l2cap_conn_start(conn); |
2506 | } | |
2507 | ||
2508 | return 0; | |
2509 | } | |
2510 | ||
1da177e4 LT |
2511 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2512 | { | |
1da177e4 LT |
2513 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2514 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2515 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2516 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2517 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2518 | |
2519 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2520 | __le16 psm = req->psm; |
1da177e4 LT |
2521 | |
2522 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2523 | ||
2524 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2525 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2526 | if (!pchan) { | |
1da177e4 LT |
2527 | result = L2CAP_CR_BAD_PSM; |
2528 | goto sendresp; | |
2529 | } | |
2530 | ||
23691d75 GP |
2531 | parent = pchan->sk; |
2532 | ||
e0f0cb56 GP |
2533 | bh_lock_sock(parent); |
2534 | ||
e7c29cb1 MH |
2535 | /* Check if the ACL is secure enough (if not SDP) */ |
2536 | if (psm != cpu_to_le16(0x0001) && | |
2537 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 2538 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
2539 | result = L2CAP_CR_SEC_BLOCK; |
2540 | goto response; | |
2541 | } | |
2542 | ||
1da177e4 LT |
2543 | result = L2CAP_CR_NO_MEM; |
2544 | ||
2545 | /* Check for backlog size */ | |
2546 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2547 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2548 | goto response; |
2549 | } | |
2550 | ||
80808e43 GP |
2551 | chan = pchan->ops->new_connection(pchan->data); |
2552 | if (!chan) | |
1da177e4 LT |
2553 | goto response; |
2554 | ||
80808e43 GP |
2555 | sk = chan->sk; |
2556 | ||
baa7e1fa | 2557 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2558 | |
2559 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2560 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2561 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 | 2562 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2563 | chan->ops->close(chan->data); |
1da177e4 LT |
2564 | goto response; |
2565 | } | |
2566 | ||
2567 | hci_conn_hold(conn->hcon); | |
2568 | ||
1da177e4 LT |
2569 | bacpy(&bt_sk(sk)->src, conn->src); |
2570 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2571 | chan->psm = psm; |
2572 | chan->dcid = scid; | |
1da177e4 | 2573 | |
d1010240 GP |
2574 | bt_accept_enqueue(parent, sk); |
2575 | ||
48454079 GP |
2576 | __l2cap_chan_add(conn, chan); |
2577 | ||
fe4128e0 | 2578 | dcid = chan->scid; |
1da177e4 | 2579 | |
c9b66675 | 2580 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2581 | |
fc7f8a7e | 2582 | chan->ident = cmd->ident; |
1da177e4 | 2583 | |
984947dc | 2584 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4343478f | 2585 | if (l2cap_check_security(chan)) { |
f66dc81f | 2586 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2587 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2588 | result = L2CAP_CR_PEND; |
2589 | status = L2CAP_CS_AUTHOR_PEND; | |
2590 | parent->sk_data_ready(parent, 0); | |
2591 | } else { | |
89bc500e | 2592 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2593 | result = L2CAP_CR_SUCCESS; |
2594 | status = L2CAP_CS_NO_INFO; | |
2595 | } | |
79d554a6 | 2596 | } else { |
89bc500e | 2597 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2598 | result = L2CAP_CR_PEND; |
2599 | status = L2CAP_CS_AUTHEN_PEND; | |
2600 | } | |
2601 | } else { | |
89bc500e | 2602 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2603 | result = L2CAP_CR_PEND; |
2604 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2605 | } |
2606 | ||
baa7e1fa | 2607 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2608 | |
2609 | response: | |
2610 | bh_unlock_sock(parent); | |
2611 | ||
2612 | sendresp: | |
aca3192c YH |
2613 | rsp.scid = cpu_to_le16(scid); |
2614 | rsp.dcid = cpu_to_le16(dcid); | |
2615 | rsp.result = cpu_to_le16(result); | |
2616 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2617 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2618 | |
2619 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2620 | struct l2cap_info_req info; | |
2621 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2622 | ||
2623 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2624 | conn->info_ident = l2cap_get_ident(conn); | |
2625 | ||
2626 | mod_timer(&conn->info_timer, jiffies + | |
2627 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2628 | ||
2629 | l2cap_send_cmd(conn, conn->info_ident, | |
2630 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2631 | } | |
2632 | ||
c1360a1c | 2633 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2634 | result == L2CAP_CR_SUCCESS) { |
2635 | u8 buf[128]; | |
c1360a1c | 2636 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2637 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2638 | l2cap_build_conf_req(chan, buf), buf); |
2639 | chan->num_conf_req++; | |
e9aeb2dd GP |
2640 | } |
2641 | ||
1da177e4 LT |
2642 | return 0; |
2643 | } | |
2644 | ||
2645 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2646 | { | |
2647 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2648 | u16 scid, dcid, result, status; | |
48454079 | 2649 | struct l2cap_chan *chan; |
1da177e4 LT |
2650 | struct sock *sk; |
2651 | u8 req[128]; | |
2652 | ||
2653 | scid = __le16_to_cpu(rsp->scid); | |
2654 | dcid = __le16_to_cpu(rsp->dcid); | |
2655 | result = __le16_to_cpu(rsp->result); | |
2656 | status = __le16_to_cpu(rsp->status); | |
2657 | ||
2658 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2659 | ||
2660 | if (scid) { | |
baa7e1fa | 2661 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2662 | if (!chan) |
57d3b22b | 2663 | return -EFAULT; |
1da177e4 | 2664 | } else { |
baa7e1fa | 2665 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2666 | if (!chan) |
57d3b22b | 2667 | return -EFAULT; |
1da177e4 LT |
2668 | } |
2669 | ||
48454079 GP |
2670 | sk = chan->sk; |
2671 | ||
1da177e4 LT |
2672 | switch (result) { |
2673 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2674 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2675 | chan->ident = 0; |
fe4128e0 | 2676 | chan->dcid = dcid; |
c1360a1c | 2677 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2678 | |
c1360a1c | 2679 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2680 | break; |
2681 | ||
1da177e4 | 2682 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2683 | l2cap_build_conf_req(chan, req), req); |
2684 | chan->num_conf_req++; | |
1da177e4 LT |
2685 | break; |
2686 | ||
2687 | case L2CAP_CR_PEND: | |
c1360a1c | 2688 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2689 | break; |
2690 | ||
2691 | default: | |
a49184c2 AE |
2692 | /* don't delete l2cap channel if sk is owned by user */ |
2693 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2694 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2695 | __clear_chan_timer(chan); |
2696 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2697 | break; |
2698 | } | |
2699 | ||
48454079 | 2700 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2701 | break; |
2702 | } | |
2703 | ||
2704 | bh_unlock_sock(sk); | |
2705 | return 0; | |
2706 | } | |
2707 | ||
47d1ec61 | 2708 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2709 | { |
2710 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2711 | * sides request it. | |
2712 | */ | |
0c1bc5c6 | 2713 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2714 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2715 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2716 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2717 | } |
2718 | ||
88219a0f | 2719 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2720 | { |
2721 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2722 | u16 dcid, flags; | |
2723 | u8 rsp[64]; | |
48454079 | 2724 | struct l2cap_chan *chan; |
1da177e4 | 2725 | struct sock *sk; |
5dee9e7c | 2726 | int len; |
1da177e4 LT |
2727 | |
2728 | dcid = __le16_to_cpu(req->dcid); | |
2729 | flags = __le16_to_cpu(req->flags); | |
2730 | ||
2731 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2732 | ||
baa7e1fa | 2733 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2734 | if (!chan) |
1da177e4 LT |
2735 | return -ENOENT; |
2736 | ||
48454079 GP |
2737 | sk = chan->sk; |
2738 | ||
033b1142 | 2739 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2740 | struct l2cap_cmd_rej_cid rej; |
2741 | ||
2742 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2743 | rej.scid = cpu_to_le16(chan->scid); | |
2744 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2745 | |
df6bd743 GP |
2746 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2747 | sizeof(rej), &rej); | |
354f60a9 | 2748 | goto unlock; |
df6bd743 | 2749 | } |
354f60a9 | 2750 | |
5dee9e7c | 2751 | /* Reject if config buffer is too small. */ |
88219a0f | 2752 | len = cmd_len - sizeof(*req); |
7ac28817 | 2753 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2754 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2755 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2756 | L2CAP_CONF_REJECT, flags), rsp); |
2757 | goto unlock; | |
2758 | } | |
2759 | ||
2760 | /* Store config. */ | |
73ffa904 GP |
2761 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2762 | chan->conf_len += len; | |
1da177e4 LT |
2763 | |
2764 | if (flags & 0x0001) { | |
2765 | /* Incomplete config. Send empty response. */ | |
2766 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2767 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2768 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2769 | goto unlock; |
2770 | } | |
2771 | ||
2772 | /* Complete config. */ | |
73ffa904 | 2773 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2774 | if (len < 0) { |
e92c8e70 | 2775 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2776 | goto unlock; |
f2fcfcd6 | 2777 | } |
1da177e4 | 2778 | |
5dee9e7c | 2779 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2780 | chan->num_conf_rsp++; |
5dee9e7c | 2781 | |
5dee9e7c | 2782 | /* Reset config buffer. */ |
73ffa904 | 2783 | chan->conf_len = 0; |
5dee9e7c | 2784 | |
c1360a1c | 2785 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2786 | goto unlock; |
2787 | ||
c1360a1c | 2788 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2789 | set_default_fcs(chan); |
fcc203c3 | 2790 | |
89bc500e | 2791 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2792 | |
42e5c802 GP |
2793 | chan->next_tx_seq = 0; |
2794 | chan->expected_tx_seq = 0; | |
58d35f87 | 2795 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2796 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2797 | l2cap_ertm_init(chan); |
0565c1c2 | 2798 | |
1da177e4 | 2799 | l2cap_chan_ready(sk); |
876d9484 MH |
2800 | goto unlock; |
2801 | } | |
2802 | ||
c1360a1c | 2803 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2804 | u8 buf[64]; |
1da177e4 | 2805 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2806 | l2cap_build_conf_req(chan, buf), buf); |
2807 | chan->num_conf_req++; | |
1da177e4 LT |
2808 | } |
2809 | ||
0e8b207e AE |
2810 | /* Got Conf Rsp PENDING from remote side and asume we sent |
2811 | Conf Rsp PENDING in the code above */ | |
2812 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
2813 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2814 | ||
2815 | /* check compatibility */ | |
2816 | ||
2817 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2818 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2819 | ||
2820 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2821 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
2822 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
2823 | } | |
2824 | ||
1da177e4 LT |
2825 | unlock: |
2826 | bh_unlock_sock(sk); | |
2827 | return 0; | |
2828 | } | |
2829 | ||
2830 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2831 | { | |
2832 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2833 | u16 scid, flags, result; | |
48454079 | 2834 | struct l2cap_chan *chan; |
1da177e4 | 2835 | struct sock *sk; |
7b1c0049 | 2836 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2837 | |
2838 | scid = __le16_to_cpu(rsp->scid); | |
2839 | flags = __le16_to_cpu(rsp->flags); | |
2840 | result = __le16_to_cpu(rsp->result); | |
2841 | ||
af05b30b GP |
2842 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2843 | scid, flags, result); | |
1da177e4 | 2844 | |
baa7e1fa | 2845 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2846 | if (!chan) |
1da177e4 LT |
2847 | return 0; |
2848 | ||
48454079 GP |
2849 | sk = chan->sk; |
2850 | ||
1da177e4 LT |
2851 | switch (result) { |
2852 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2853 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 2854 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
2855 | break; |
2856 | ||
0e8b207e AE |
2857 | case L2CAP_CONF_PENDING: |
2858 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
2859 | ||
2860 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2861 | char buf[64]; | |
2862 | ||
2863 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2864 | buf, &result); | |
2865 | if (len < 0) { | |
2866 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
2867 | goto done; | |
2868 | } | |
2869 | ||
2870 | /* check compatibility */ | |
2871 | ||
2872 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2873 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2874 | ||
2875 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2876 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
2877 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
2878 | } | |
2879 | goto done; | |
2880 | ||
1da177e4 | 2881 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 2882 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2883 | char req[64]; |
2884 | ||
c2c77ec8 | 2885 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2886 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2887 | goto done; |
2888 | } | |
2889 | ||
f2fcfcd6 GP |
2890 | /* throw out any old stored conf requests */ |
2891 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2892 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2893 | req, &result); | |
f2fcfcd6 | 2894 | if (len < 0) { |
e92c8e70 | 2895 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2896 | goto done; |
2897 | } | |
2898 | ||
2899 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2900 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2901 | chan->num_conf_req++; |
f2fcfcd6 GP |
2902 | if (result != L2CAP_CONF_SUCCESS) |
2903 | goto done; | |
2904 | break; | |
1da177e4 LT |
2905 | } |
2906 | ||
8e87d142 | 2907 | default: |
b1235d79 | 2908 | sk->sk_err = ECONNRESET; |
c9b66675 | 2909 | __set_chan_timer(chan, HZ * 5); |
e92c8e70 | 2910 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2911 | goto done; |
2912 | } | |
2913 | ||
2914 | if (flags & 0x01) | |
2915 | goto done; | |
2916 | ||
c1360a1c | 2917 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 2918 | |
c1360a1c | 2919 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2920 | set_default_fcs(chan); |
fcc203c3 | 2921 | |
89bc500e | 2922 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2923 | chan->next_tx_seq = 0; |
2924 | chan->expected_tx_seq = 0; | |
58d35f87 | 2925 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2926 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2927 | l2cap_ertm_init(chan); |
0565c1c2 | 2928 | |
1da177e4 LT |
2929 | l2cap_chan_ready(sk); |
2930 | } | |
2931 | ||
2932 | done: | |
2933 | bh_unlock_sock(sk); | |
2934 | return 0; | |
2935 | } | |
2936 | ||
2937 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2938 | { | |
2939 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2940 | struct l2cap_disconn_rsp rsp; | |
2941 | u16 dcid, scid; | |
48454079 | 2942 | struct l2cap_chan *chan; |
1da177e4 LT |
2943 | struct sock *sk; |
2944 | ||
2945 | scid = __le16_to_cpu(req->scid); | |
2946 | dcid = __le16_to_cpu(req->dcid); | |
2947 | ||
2948 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2949 | ||
baa7e1fa | 2950 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2951 | if (!chan) |
1da177e4 LT |
2952 | return 0; |
2953 | ||
48454079 GP |
2954 | sk = chan->sk; |
2955 | ||
fe4128e0 GP |
2956 | rsp.dcid = cpu_to_le16(chan->scid); |
2957 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
2958 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2959 | ||
2960 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2961 | ||
a49184c2 AE |
2962 | /* don't delete l2cap channel if sk is owned by user */ |
2963 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2964 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 GP |
2965 | __clear_chan_timer(chan); |
2966 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
2967 | bh_unlock_sock(sk); |
2968 | return 0; | |
2969 | } | |
2970 | ||
48454079 | 2971 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2972 | bh_unlock_sock(sk); |
2973 | ||
ba3bd0ee | 2974 | chan->ops->close(chan->data); |
1da177e4 LT |
2975 | return 0; |
2976 | } | |
2977 | ||
2978 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2979 | { | |
2980 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2981 | u16 dcid, scid; | |
48454079 | 2982 | struct l2cap_chan *chan; |
1da177e4 LT |
2983 | struct sock *sk; |
2984 | ||
2985 | scid = __le16_to_cpu(rsp->scid); | |
2986 | dcid = __le16_to_cpu(rsp->dcid); | |
2987 | ||
2988 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2989 | ||
baa7e1fa | 2990 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2991 | if (!chan) |
1da177e4 LT |
2992 | return 0; |
2993 | ||
48454079 GP |
2994 | sk = chan->sk; |
2995 | ||
a49184c2 AE |
2996 | /* don't delete l2cap channel if sk is owned by user */ |
2997 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2998 | l2cap_state_change(chan,BT_DISCONN); |
c9b66675 GP |
2999 | __clear_chan_timer(chan); |
3000 | __set_chan_timer(chan, HZ / 5); | |
a49184c2 AE |
3001 | bh_unlock_sock(sk); |
3002 | return 0; | |
3003 | } | |
3004 | ||
48454079 | 3005 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
3006 | bh_unlock_sock(sk); |
3007 | ||
ba3bd0ee | 3008 | chan->ops->close(chan->data); |
1da177e4 LT |
3009 | return 0; |
3010 | } | |
3011 | ||
3012 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3013 | { | |
3014 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3015 | u16 type; |
3016 | ||
3017 | type = __le16_to_cpu(req->type); | |
3018 | ||
3019 | BT_DBG("type 0x%4.4x", type); | |
3020 | ||
f0709e03 MH |
3021 | if (type == L2CAP_IT_FEAT_MASK) { |
3022 | u8 buf[8]; | |
44dd46de | 3023 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3024 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3025 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3026 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3027 | if (!disable_ertm) |
fcc203c3 GP |
3028 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3029 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3030 | if (enable_hs) |
6327eb98 AE |
3031 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3032 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3033 | |
1b7bf4ed | 3034 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3035 | l2cap_send_cmd(conn, cmd->ident, |
3036 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3037 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3038 | u8 buf[12]; | |
3039 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3040 | |
3041 | if (enable_hs) | |
3042 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3043 | else | |
3044 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3045 | ||
e1027a7c MH |
3046 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3047 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3048 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3049 | l2cap_send_cmd(conn, cmd->ident, |
3050 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3051 | } else { |
3052 | struct l2cap_info_rsp rsp; | |
3053 | rsp.type = cpu_to_le16(type); | |
3054 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3055 | l2cap_send_cmd(conn, cmd->ident, | |
3056 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3057 | } | |
1da177e4 LT |
3058 | |
3059 | return 0; | |
3060 | } | |
3061 | ||
3062 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3063 | { | |
3064 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3065 | u16 type, result; | |
3066 | ||
3067 | type = __le16_to_cpu(rsp->type); | |
3068 | result = __le16_to_cpu(rsp->result); | |
3069 | ||
3070 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3071 | ||
e90165be AE |
3072 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3073 | if (cmd->ident != conn->info_ident || | |
3074 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3075 | return 0; | |
3076 | ||
4e8402a3 MH |
3077 | del_timer(&conn->info_timer); |
3078 | ||
adb08ede VT |
3079 | if (result != L2CAP_IR_SUCCESS) { |
3080 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3081 | conn->info_ident = 0; | |
3082 | ||
3083 | l2cap_conn_start(conn); | |
3084 | ||
3085 | return 0; | |
3086 | } | |
3087 | ||
984947dc | 3088 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3089 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3090 | |
47ec1dcd | 3091 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3092 | struct l2cap_info_req req; |
3093 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3094 | ||
3095 | conn->info_ident = l2cap_get_ident(conn); | |
3096 | ||
3097 | l2cap_send_cmd(conn, conn->info_ident, | |
3098 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3099 | } else { | |
3100 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3101 | conn->info_ident = 0; | |
3102 | ||
3103 | l2cap_conn_start(conn); | |
3104 | } | |
3105 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3106 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3107 | conn->info_ident = 0; |
984947dc MH |
3108 | |
3109 | l2cap_conn_start(conn); | |
3110 | } | |
4e8402a3 | 3111 | |
1da177e4 LT |
3112 | return 0; |
3113 | } | |
3114 | ||
f94ff6ff MM |
3115 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3116 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3117 | void *data) | |
3118 | { | |
3119 | struct l2cap_create_chan_req *req = data; | |
3120 | struct l2cap_create_chan_rsp rsp; | |
3121 | u16 psm, scid; | |
3122 | ||
3123 | if (cmd_len != sizeof(*req)) | |
3124 | return -EPROTO; | |
3125 | ||
3126 | if (!enable_hs) | |
3127 | return -EINVAL; | |
3128 | ||
3129 | psm = le16_to_cpu(req->psm); | |
3130 | scid = le16_to_cpu(req->scid); | |
3131 | ||
3132 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3133 | ||
3134 | /* Placeholder: Always reject */ | |
3135 | rsp.dcid = 0; | |
3136 | rsp.scid = cpu_to_le16(scid); | |
3137 | rsp.result = L2CAP_CR_NO_MEM; | |
3138 | rsp.status = L2CAP_CS_NO_INFO; | |
3139 | ||
3140 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3141 | sizeof(rsp), &rsp); | |
3142 | ||
3143 | return 0; | |
3144 | } | |
3145 | ||
3146 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3147 | struct l2cap_cmd_hdr *cmd, void *data) | |
3148 | { | |
3149 | BT_DBG("conn %p", conn); | |
3150 | ||
3151 | return l2cap_connect_rsp(conn, cmd, data); | |
3152 | } | |
3153 | ||
8d5a04a1 MM |
3154 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3155 | u16 icid, u16 result) | |
3156 | { | |
3157 | struct l2cap_move_chan_rsp rsp; | |
3158 | ||
3159 | BT_DBG("icid %d, result %d", icid, result); | |
3160 | ||
3161 | rsp.icid = cpu_to_le16(icid); | |
3162 | rsp.result = cpu_to_le16(result); | |
3163 | ||
3164 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3165 | } | |
3166 | ||
3167 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3168 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3169 | { | |
3170 | struct l2cap_move_chan_cfm cfm; | |
3171 | u8 ident; | |
3172 | ||
3173 | BT_DBG("icid %d, result %d", icid, result); | |
3174 | ||
3175 | ident = l2cap_get_ident(conn); | |
3176 | if (chan) | |
3177 | chan->ident = ident; | |
3178 | ||
3179 | cfm.icid = cpu_to_le16(icid); | |
3180 | cfm.result = cpu_to_le16(result); | |
3181 | ||
3182 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3183 | } | |
3184 | ||
3185 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3186 | u16 icid) | |
3187 | { | |
3188 | struct l2cap_move_chan_cfm_rsp rsp; | |
3189 | ||
3190 | BT_DBG("icid %d", icid); | |
3191 | ||
3192 | rsp.icid = cpu_to_le16(icid); | |
3193 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3194 | } | |
3195 | ||
3196 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3197 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3198 | { | |
3199 | struct l2cap_move_chan_req *req = data; | |
3200 | u16 icid = 0; | |
3201 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3202 | ||
3203 | if (cmd_len != sizeof(*req)) | |
3204 | return -EPROTO; | |
3205 | ||
3206 | icid = le16_to_cpu(req->icid); | |
3207 | ||
3208 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3209 | ||
3210 | if (!enable_hs) | |
3211 | return -EINVAL; | |
3212 | ||
3213 | /* Placeholder: Always refuse */ | |
3214 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3215 | ||
3216 | return 0; | |
3217 | } | |
3218 | ||
3219 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3220 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3221 | { | |
3222 | struct l2cap_move_chan_rsp *rsp = data; | |
3223 | u16 icid, result; | |
3224 | ||
3225 | if (cmd_len != sizeof(*rsp)) | |
3226 | return -EPROTO; | |
3227 | ||
3228 | icid = le16_to_cpu(rsp->icid); | |
3229 | result = le16_to_cpu(rsp->result); | |
3230 | ||
3231 | BT_DBG("icid %d, result %d", icid, result); | |
3232 | ||
3233 | /* Placeholder: Always unconfirmed */ | |
3234 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3235 | ||
3236 | return 0; | |
3237 | } | |
3238 | ||
3239 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3240 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3241 | { | |
3242 | struct l2cap_move_chan_cfm *cfm = data; | |
3243 | u16 icid, result; | |
3244 | ||
3245 | if (cmd_len != sizeof(*cfm)) | |
3246 | return -EPROTO; | |
3247 | ||
3248 | icid = le16_to_cpu(cfm->icid); | |
3249 | result = le16_to_cpu(cfm->result); | |
3250 | ||
3251 | BT_DBG("icid %d, result %d", icid, result); | |
3252 | ||
3253 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3254 | ||
3255 | return 0; | |
3256 | } | |
3257 | ||
3258 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3259 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3260 | { | |
3261 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3262 | u16 icid; | |
3263 | ||
3264 | if (cmd_len != sizeof(*rsp)) | |
3265 | return -EPROTO; | |
3266 | ||
3267 | icid = le16_to_cpu(rsp->icid); | |
3268 | ||
3269 | BT_DBG("icid %d", icid); | |
3270 | ||
3271 | return 0; | |
3272 | } | |
3273 | ||
e2174ca4 | 3274 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3275 | u16 to_multiplier) |
3276 | { | |
3277 | u16 max_latency; | |
3278 | ||
3279 | if (min > max || min < 6 || max > 3200) | |
3280 | return -EINVAL; | |
3281 | ||
3282 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3283 | return -EINVAL; | |
3284 | ||
3285 | if (max >= to_multiplier * 8) | |
3286 | return -EINVAL; | |
3287 | ||
3288 | max_latency = (to_multiplier * 8 / max) - 1; | |
3289 | if (latency > 499 || latency > max_latency) | |
3290 | return -EINVAL; | |
3291 | ||
3292 | return 0; | |
3293 | } | |
3294 | ||
3295 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3296 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3297 | { | |
3298 | struct hci_conn *hcon = conn->hcon; | |
3299 | struct l2cap_conn_param_update_req *req; | |
3300 | struct l2cap_conn_param_update_rsp rsp; | |
3301 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3302 | int err; |
de73115a CT |
3303 | |
3304 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3305 | return -EINVAL; | |
3306 | ||
3307 | cmd_len = __le16_to_cpu(cmd->len); | |
3308 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3309 | return -EPROTO; | |
3310 | ||
3311 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
3312 | min = __le16_to_cpu(req->min); |
3313 | max = __le16_to_cpu(req->max); | |
de73115a CT |
3314 | latency = __le16_to_cpu(req->latency); |
3315 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
3316 | ||
3317 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
3318 | min, max, latency, to_multiplier); | |
3319 | ||
3320 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
3321 | |
3322 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
3323 | if (err) | |
de73115a CT |
3324 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
3325 | else | |
3326 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
3327 | ||
3328 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
3329 | sizeof(rsp), &rsp); | |
3330 | ||
2ce603eb CT |
3331 | if (!err) |
3332 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
3333 | ||
de73115a CT |
3334 | return 0; |
3335 | } | |
3336 | ||
3300d9a9 CT |
3337 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
3338 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
3339 | { | |
3340 | int err = 0; | |
3341 | ||
3342 | switch (cmd->code) { | |
3343 | case L2CAP_COMMAND_REJ: | |
3344 | l2cap_command_rej(conn, cmd, data); | |
3345 | break; | |
3346 | ||
3347 | case L2CAP_CONN_REQ: | |
3348 | err = l2cap_connect_req(conn, cmd, data); | |
3349 | break; | |
3350 | ||
3351 | case L2CAP_CONN_RSP: | |
3352 | err = l2cap_connect_rsp(conn, cmd, data); | |
3353 | break; | |
3354 | ||
3355 | case L2CAP_CONF_REQ: | |
3356 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
3357 | break; | |
3358 | ||
3359 | case L2CAP_CONF_RSP: | |
3360 | err = l2cap_config_rsp(conn, cmd, data); | |
3361 | break; | |
3362 | ||
3363 | case L2CAP_DISCONN_REQ: | |
3364 | err = l2cap_disconnect_req(conn, cmd, data); | |
3365 | break; | |
3366 | ||
3367 | case L2CAP_DISCONN_RSP: | |
3368 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3369 | break; | |
3370 | ||
3371 | case L2CAP_ECHO_REQ: | |
3372 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3373 | break; | |
3374 | ||
3375 | case L2CAP_ECHO_RSP: | |
3376 | break; | |
3377 | ||
3378 | case L2CAP_INFO_REQ: | |
3379 | err = l2cap_information_req(conn, cmd, data); | |
3380 | break; | |
3381 | ||
3382 | case L2CAP_INFO_RSP: | |
3383 | err = l2cap_information_rsp(conn, cmd, data); | |
3384 | break; | |
3385 | ||
f94ff6ff MM |
3386 | case L2CAP_CREATE_CHAN_REQ: |
3387 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
3388 | break; | |
3389 | ||
3390 | case L2CAP_CREATE_CHAN_RSP: | |
3391 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
3392 | break; | |
3393 | ||
8d5a04a1 MM |
3394 | case L2CAP_MOVE_CHAN_REQ: |
3395 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
3396 | break; | |
3397 | ||
3398 | case L2CAP_MOVE_CHAN_RSP: | |
3399 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
3400 | break; | |
3401 | ||
3402 | case L2CAP_MOVE_CHAN_CFM: | |
3403 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
3404 | break; | |
3405 | ||
3406 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
3407 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
3408 | break; | |
3409 | ||
3300d9a9 CT |
3410 | default: |
3411 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3412 | err = -EINVAL; | |
3413 | break; | |
3414 | } | |
3415 | ||
3416 | return err; | |
3417 | } | |
3418 | ||
3419 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3420 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3421 | { | |
3422 | switch (cmd->code) { | |
3423 | case L2CAP_COMMAND_REJ: | |
3424 | return 0; | |
3425 | ||
3426 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3427 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3428 | |
3429 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3430 | return 0; | |
3431 | ||
3432 | default: | |
3433 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3434 | return -EINVAL; | |
3435 | } | |
3436 | } | |
3437 | ||
3438 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3439 | struct sk_buff *skb) | |
1da177e4 LT |
3440 | { |
3441 | u8 *data = skb->data; | |
3442 | int len = skb->len; | |
3443 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3444 | int err; |
1da177e4 LT |
3445 | |
3446 | l2cap_raw_recv(conn, skb); | |
3447 | ||
3448 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3449 | u16 cmd_len; |
1da177e4 LT |
3450 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3451 | data += L2CAP_CMD_HDR_SIZE; | |
3452 | len -= L2CAP_CMD_HDR_SIZE; | |
3453 | ||
88219a0f | 3454 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3455 | |
88219a0f | 3456 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3457 | |
88219a0f | 3458 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3459 | BT_DBG("corrupted command"); |
3460 | break; | |
3461 | } | |
3462 | ||
3300d9a9 CT |
3463 | if (conn->hcon->type == LE_LINK) |
3464 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3465 | else | |
3466 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3467 | |
3468 | if (err) { | |
e2fd318e | 3469 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3470 | |
3471 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3472 | |
3473 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3474 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3475 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3476 | } | |
3477 | ||
88219a0f AV |
3478 | data += cmd_len; |
3479 | len -= cmd_len; | |
1da177e4 LT |
3480 | } |
3481 | ||
3482 | kfree_skb(skb); | |
3483 | } | |
3484 | ||
47d1ec61 | 3485 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3486 | { |
3487 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
3488 | int hdr_size; |
3489 | ||
3490 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3491 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
3492 | else | |
3493 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 3494 | |
47d1ec61 | 3495 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 3496 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
3497 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3498 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3499 | ||
3500 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3501 | return -EBADMSG; |
fcc203c3 GP |
3502 | } |
3503 | return 0; | |
3504 | } | |
3505 | ||
525cd185 | 3506 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3507 | { |
88843ab0 | 3508 | u32 control = 0; |
d5392c8f | 3509 | |
6a026610 | 3510 | chan->frames_sent = 0; |
d5392c8f | 3511 | |
0b209fae | 3512 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3513 | |
e2ab4353 | 3514 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3515 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3516 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3517 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3518 | } |
3519 | ||
e2ab4353 | 3520 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3521 | l2cap_retransmit_frames(chan); |
d5392c8f | 3522 | |
525cd185 | 3523 | l2cap_ertm_send(chan); |
d5392c8f | 3524 | |
e2ab4353 | 3525 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3526 | chan->frames_sent == 0) { |
ab784b73 | 3527 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3528 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3529 | } |
3530 | } | |
3531 | ||
fb45de7d | 3532 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
3533 | { |
3534 | struct sk_buff *next_skb; | |
bfbacc11 | 3535 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3536 | |
3537 | bt_cb(skb)->tx_seq = tx_seq; | |
3538 | bt_cb(skb)->sar = sar; | |
3539 | ||
f1c6775b | 3540 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3541 | if (!next_skb) { |
f1c6775b | 3542 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 3543 | return 0; |
8f17154f GP |
3544 | } |
3545 | ||
836be934 | 3546 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 3547 | |
8f17154f | 3548 | do { |
9b53350d JPRV |
3549 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3550 | return -EINVAL; | |
3551 | ||
836be934 AE |
3552 | next_tx_seq_offset = __seq_offset(chan, |
3553 | bt_cb(next_skb)->tx_seq, chan->buffer_seq); | |
bfbacc11 JPRV |
3554 | |
3555 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3556 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3557 | return 0; |
8f17154f GP |
3558 | } |
3559 | ||
f1c6775b | 3560 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
3561 | break; |
3562 | ||
f1c6775b | 3563 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 3564 | |
f1c6775b | 3565 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3566 | |
3567 | return 0; | |
8f17154f GP |
3568 | } |
3569 | ||
84084a31 MM |
3570 | static void append_skb_frag(struct sk_buff *skb, |
3571 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 3572 | { |
84084a31 MM |
3573 | /* skb->len reflects data in skb as well as all fragments |
3574 | * skb->data_len reflects only data in fragments | |
3575 | */ | |
3576 | if (!skb_has_frag_list(skb)) | |
3577 | skb_shinfo(skb)->frag_list = new_frag; | |
3578 | ||
3579 | new_frag->next = NULL; | |
3580 | ||
3581 | (*last_frag)->next = new_frag; | |
3582 | *last_frag = new_frag; | |
3583 | ||
3584 | skb->len += new_frag->len; | |
3585 | skb->data_len += new_frag->len; | |
3586 | skb->truesize += new_frag->truesize; | |
3587 | } | |
3588 | ||
88843ab0 | 3589 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
3590 | { |
3591 | int err = -EINVAL; | |
18778a63 | 3592 | |
7e0ef6ee AE |
3593 | switch (__get_ctrl_sar(chan, control)) { |
3594 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
3595 | if (chan->sdu) |
3596 | break; | |
18778a63 | 3597 | |
84084a31 MM |
3598 | err = chan->ops->recv(chan->data, skb); |
3599 | break; | |
18778a63 | 3600 | |
7e0ef6ee | 3601 | case L2CAP_SAR_START: |
84084a31 MM |
3602 | if (chan->sdu) |
3603 | break; | |
18778a63 | 3604 | |
6f61fd47 | 3605 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 3606 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 3607 | |
84084a31 MM |
3608 | if (chan->sdu_len > chan->imtu) { |
3609 | err = -EMSGSIZE; | |
3610 | break; | |
3611 | } | |
1890d36b | 3612 | |
84084a31 MM |
3613 | if (skb->len >= chan->sdu_len) |
3614 | break; | |
18778a63 | 3615 | |
84084a31 MM |
3616 | chan->sdu = skb; |
3617 | chan->sdu_last_frag = skb; | |
18778a63 | 3618 | |
84084a31 MM |
3619 | skb = NULL; |
3620 | err = 0; | |
18778a63 GP |
3621 | break; |
3622 | ||
7e0ef6ee | 3623 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 3624 | if (!chan->sdu) |
84084a31 | 3625 | break; |
18778a63 | 3626 | |
84084a31 MM |
3627 | append_skb_frag(chan->sdu, skb, |
3628 | &chan->sdu_last_frag); | |
3629 | skb = NULL; | |
18778a63 | 3630 | |
84084a31 MM |
3631 | if (chan->sdu->len >= chan->sdu_len) |
3632 | break; | |
4178ba46 | 3633 | |
84084a31 | 3634 | err = 0; |
18778a63 GP |
3635 | break; |
3636 | ||
7e0ef6ee | 3637 | case L2CAP_SAR_END: |
6f61fd47 | 3638 | if (!chan->sdu) |
84084a31 | 3639 | break; |
18778a63 | 3640 | |
84084a31 MM |
3641 | append_skb_frag(chan->sdu, skb, |
3642 | &chan->sdu_last_frag); | |
3643 | skb = NULL; | |
4178ba46 | 3644 | |
84084a31 MM |
3645 | if (chan->sdu->len != chan->sdu_len) |
3646 | break; | |
18778a63 | 3647 | |
84084a31 | 3648 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 3649 | |
84084a31 MM |
3650 | if (!err) { |
3651 | /* Reassembly complete */ | |
3652 | chan->sdu = NULL; | |
3653 | chan->sdu_last_frag = NULL; | |
3654 | chan->sdu_len = 0; | |
1890d36b | 3655 | } |
18778a63 GP |
3656 | break; |
3657 | } | |
3658 | ||
84084a31 MM |
3659 | if (err) { |
3660 | kfree_skb(skb); | |
3661 | kfree_skb(chan->sdu); | |
3662 | chan->sdu = NULL; | |
3663 | chan->sdu_last_frag = NULL; | |
3664 | chan->sdu_len = 0; | |
3665 | } | |
18778a63 | 3666 | |
84084a31 | 3667 | return err; |
18778a63 GP |
3668 | } |
3669 | ||
26f880d2 | 3670 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3671 | { |
88843ab0 | 3672 | u32 control; |
712132eb | 3673 | |
26f880d2 | 3674 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3675 | |
26f880d2 MM |
3676 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3677 | ||
0b209fae | 3678 | control = __set_reqseq(chan, chan->buffer_seq); |
ab784b73 | 3679 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
26f880d2 MM |
3680 | l2cap_send_sframe(chan, control); |
3681 | ||
3682 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
3683 | ||
3684 | __clear_ack_timer(chan); | |
3685 | } | |
3686 | ||
3687 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3688 | { | |
88843ab0 | 3689 | u32 control; |
712132eb | 3690 | |
e2ab4353 | 3691 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3692 | goto done; |
3693 | ||
0b209fae | 3694 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 3695 | control |= __set_ctrl_poll(chan); |
ab784b73 | 3696 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3697 | l2cap_send_sframe(chan, control); |
6a026610 | 3698 | chan->retry_count = 1; |
712132eb | 3699 | |
1a09bcb9 GP |
3700 | __clear_retrans_timer(chan); |
3701 | __set_monitor_timer(chan); | |
712132eb | 3702 | |
e2ab4353 | 3703 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3704 | |
3705 | done: | |
e2ab4353 GP |
3706 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3707 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3708 | |
49208c9c | 3709 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3710 | } |
3711 | ||
e328140f | 3712 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3713 | { |
e328140f MM |
3714 | if (chan->mode == L2CAP_MODE_ERTM) { |
3715 | if (busy) | |
3716 | l2cap_ertm_enter_local_busy(chan); | |
3717 | else | |
3718 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3719 | } |
1890d36b GP |
3720 | } |
3721 | ||
fb45de7d | 3722 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
3723 | { |
3724 | struct sk_buff *skb; | |
88843ab0 | 3725 | u32 control; |
8f17154f | 3726 | |
e328140f MM |
3727 | while ((skb = skb_peek(&chan->srej_q)) && |
3728 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3729 | int err; | |
3730 | ||
8f17154f GP |
3731 | if (bt_cb(skb)->tx_seq != tx_seq) |
3732 | break; | |
3733 | ||
f1c6775b | 3734 | skb = skb_dequeue(&chan->srej_q); |
7e0ef6ee | 3735 | control = __set_ctrl_sar(chan, bt_cb(skb)->sar); |
84084a31 | 3736 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
3737 | |
3738 | if (err < 0) { | |
3739 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3740 | break; | |
3741 | } | |
3742 | ||
836be934 AE |
3743 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
3744 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
3745 | } |
3746 | } | |
3747 | ||
fb45de7d | 3748 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3749 | { |
8f17154f | 3750 | struct srej_list *l, *tmp; |
88843ab0 | 3751 | u32 control; |
8f17154f | 3752 | |
39d5a3ee | 3753 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3754 | if (l->tx_seq == tx_seq) { |
3755 | list_del(&l->list); | |
3756 | kfree(l); | |
3757 | return; | |
3758 | } | |
ab784b73 | 3759 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3760 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 3761 | l2cap_send_sframe(chan, control); |
8f17154f | 3762 | list_del(&l->list); |
39d5a3ee | 3763 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3764 | } |
3765 | } | |
3766 | ||
fb45de7d | 3767 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3768 | { |
8f17154f | 3769 | struct srej_list *new; |
88843ab0 | 3770 | u32 control; |
8f17154f | 3771 | |
42e5c802 | 3772 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 3773 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3774 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
525cd185 | 3775 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3776 | |
3777 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 | 3778 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
3779 | |
3780 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
3781 | ||
39d5a3ee | 3782 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3783 | } |
836be934 AE |
3784 | |
3785 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
8f17154f GP |
3786 | } |
3787 | ||
88843ab0 | 3788 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 3789 | { |
fb45de7d | 3790 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 3791 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 3792 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 3793 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3794 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3795 | int err = 0; |
3796 | ||
88843ab0 | 3797 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 3798 | tx_seq, rx_control); |
1c2acffb | 3799 | |
03f6715d | 3800 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 3801 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3802 | __clear_monitor_timer(chan); |
6a026610 | 3803 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3804 | __set_retrans_timer(chan); |
e2ab4353 | 3805 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3806 | } |
3807 | ||
42e5c802 GP |
3808 | chan->expected_ack_seq = req_seq; |
3809 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3810 | |
836be934 | 3811 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
3812 | |
3813 | /* invalid tx_seq */ | |
47d1ec61 | 3814 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3815 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3816 | goto drop; |
3817 | } | |
3818 | ||
e2ab4353 | 3819 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1890d36b GP |
3820 | goto drop; |
3821 | ||
02f1b641 MM |
3822 | if (tx_seq == chan->expected_tx_seq) |
3823 | goto expected; | |
3824 | ||
e2ab4353 | 3825 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3826 | struct srej_list *first; |
30afb5b2 | 3827 | |
39d5a3ee | 3828 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3829 | struct srej_list, list); |
3830 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3831 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3832 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3833 | |
3834 | list_del(&first->list); | |
3835 | kfree(first); | |
3836 | ||
39d5a3ee | 3837 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3838 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3839 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3840 | l2cap_send_ack(chan); |
49208c9c | 3841 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3842 | } |
3843 | } else { | |
3844 | struct srej_list *l; | |
9b53350d JPRV |
3845 | |
3846 | /* duplicated tx_seq */ | |
42e5c802 | 3847 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3848 | goto drop; |
8f17154f | 3849 | |
39d5a3ee | 3850 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3851 | if (l->tx_seq == tx_seq) { |
525cd185 | 3852 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3853 | return 0; |
3854 | } | |
3855 | } | |
525cd185 | 3856 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3857 | } |
3858 | } else { | |
836be934 AE |
3859 | expected_tx_seq_offset = __seq_offset(chan, |
3860 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
3861 | |
3862 | /* duplicated tx_seq */ | |
3863 | if (tx_seq_offset < expected_tx_seq_offset) | |
3864 | goto drop; | |
3865 | ||
e2ab4353 | 3866 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 3867 | |
49208c9c | 3868 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3869 | |
39d5a3ee | 3870 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3871 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3872 | |
f1c6775b | 3873 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 3874 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3875 | |
e2ab4353 | 3876 | set_bit(CONN_SEND_PBIT, &chan->conn_state); |
ef54fd93 | 3877 | |
525cd185 | 3878 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3879 | |
1a09bcb9 | 3880 | __clear_ack_timer(chan); |
1c2acffb | 3881 | } |
30afb5b2 GP |
3882 | return 0; |
3883 | ||
8f17154f | 3884 | expected: |
836be934 | 3885 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 3886 | |
e2ab4353 | 3887 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
3888 | bt_cb(skb)->tx_seq = tx_seq; |
3889 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3890 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3891 | return 0; |
3892 | } | |
3893 | ||
84084a31 | 3894 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
3895 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
3896 | ||
e328140f MM |
3897 | if (err < 0) { |
3898 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3899 | return err; | |
3900 | } | |
2ece3684 | 3901 | |
03f6715d | 3902 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 3903 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3904 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3905 | } |
3906 | ||
1a09bcb9 | 3907 | __set_ack_timer(chan); |
c1b4f43b | 3908 | |
6a026610 GP |
3909 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3910 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3911 | l2cap_send_ack(chan); |
9e917af1 | 3912 | |
8f17154f | 3913 | return 0; |
9b53350d JPRV |
3914 | |
3915 | drop: | |
3916 | kfree_skb(skb); | |
3917 | return 0; | |
1c2acffb GP |
3918 | } |
3919 | ||
88843ab0 | 3920 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 3921 | { |
88843ab0 | 3922 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 3923 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 3924 | |
0b209fae | 3925 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 3926 | l2cap_drop_acked_frames(chan); |
1c2acffb | 3927 | |
e3781735 | 3928 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
3929 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3930 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
3931 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 3932 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3933 | __set_retrans_timer(chan); |
05fbd89d | 3934 | |
e2ab4353 | 3935 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 3936 | l2cap_send_srejtail(chan); |
05fbd89d | 3937 | } else { |
525cd185 | 3938 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3939 | } |
1d8f5d16 | 3940 | |
03f6715d | 3941 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 3942 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 3943 | |
e2ab4353 | 3944 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3945 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3946 | |
e072745f | 3947 | } else { |
e2ab4353 | 3948 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 3949 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3950 | __set_retrans_timer(chan); |
1c2acffb | 3951 | |
e2ab4353 GP |
3952 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
3953 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 3954 | l2cap_send_ack(chan); |
894718a6 | 3955 | else |
525cd185 | 3956 | l2cap_ertm_send(chan); |
e072745f GP |
3957 | } |
3958 | } | |
2246b2f1 | 3959 | |
88843ab0 | 3960 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 3961 | { |
0b209fae | 3962 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 3963 | |
88843ab0 | 3964 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 3965 | |
e2ab4353 | 3966 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 3967 | |
42e5c802 GP |
3968 | chan->expected_ack_seq = tx_seq; |
3969 | l2cap_drop_acked_frames(chan); | |
e072745f | 3970 | |
03f6715d | 3971 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 3972 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3973 | l2cap_retransmit_frames(chan); |
e072745f | 3974 | } else { |
525cd185 | 3975 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3976 | |
e2ab4353 GP |
3977 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
3978 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
3979 | } |
3980 | } | |
88843ab0 | 3981 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 3982 | { |
0b209fae | 3983 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 3984 | |
88843ab0 | 3985 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 3986 | |
e2ab4353 | 3987 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 3988 | |
e3781735 | 3989 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
3990 | chan->expected_ack_seq = tx_seq; |
3991 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3992 | |
e2ab4353 | 3993 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 3994 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 3995 | |
525cd185 | 3996 | l2cap_ertm_send(chan); |
dfc909be | 3997 | |
e2ab4353 | 3998 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 3999 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4000 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4001 | } |
03f6715d | 4002 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4003 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4004 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4005 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4006 | else |
525cd185 | 4007 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4008 | } else { |
525cd185 | 4009 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4010 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4011 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4012 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4013 | } |
e072745f GP |
4014 | } |
4015 | } | |
4016 | ||
88843ab0 | 4017 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4018 | { |
0b209fae | 4019 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4020 | |
88843ab0 | 4021 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4022 | |
e2ab4353 | 4023 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4024 | chan->expected_ack_seq = tx_seq; |
4025 | l2cap_drop_acked_frames(chan); | |
e072745f | 4026 | |
e3781735 | 4027 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4028 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4029 | |
e2ab4353 | 4030 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4031 | __clear_retrans_timer(chan); |
e3781735 | 4032 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4033 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4034 | return; |
e072745f | 4035 | } |
99b0d4b7 | 4036 | |
e3781735 | 4037 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4038 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4039 | } else { |
4040 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
4041 | l2cap_send_sframe(chan, rx_control); | |
4042 | } | |
e072745f GP |
4043 | } |
4044 | ||
88843ab0 | 4045 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4046 | { |
88843ab0 | 4047 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4048 | |
03f6715d | 4049 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4050 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4051 | __clear_monitor_timer(chan); |
6a026610 | 4052 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4053 | __set_retrans_timer(chan); |
e2ab4353 | 4054 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4055 | } |
4056 | ||
ab784b73 AE |
4057 | switch (__get_ctrl_super(chan, rx_control)) { |
4058 | case L2CAP_SUPER_RR: | |
525cd185 | 4059 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4060 | break; |
4061 | ||
ab784b73 | 4062 | case L2CAP_SUPER_REJ: |
525cd185 | 4063 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4064 | break; |
2246b2f1 | 4065 | |
ab784b73 | 4066 | case L2CAP_SUPER_SREJ: |
525cd185 | 4067 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4068 | break; |
4069 | ||
ab784b73 | 4070 | case L2CAP_SUPER_RNR: |
525cd185 | 4071 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4072 | break; |
4073 | } | |
4074 | ||
faaebd19 | 4075 | kfree_skb(skb); |
1c2acffb GP |
4076 | return 0; |
4077 | } | |
4078 | ||
218bb9df GP |
4079 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
4080 | { | |
525cd185 | 4081 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
88843ab0 | 4082 | u32 control; |
0b209fae | 4083 | u16 req_seq; |
218bb9df GP |
4084 | int len, next_tx_seq_offset, req_seq_offset; |
4085 | ||
88843ab0 AE |
4086 | control = __get_control(chan, skb->data); |
4087 | skb_pull(skb, __ctrl_size(chan)); | |
218bb9df GP |
4088 | len = skb->len; |
4089 | ||
4090 | /* | |
4091 | * We can just drop the corrupted I-frame here. | |
4092 | * Receiver will miss it and start proper recovery | |
4093 | * procedures and ask retransmission. | |
4094 | */ | |
47d1ec61 | 4095 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4096 | goto drop; |
4097 | ||
793c2f1c | 4098 | if (__is_sar_start(chan, control) && !__is_sframe(chan, control)) |
03a51213 | 4099 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4100 | |
47d1ec61 | 4101 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4102 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4103 | |
47d1ec61 | 4104 | if (len > chan->mps) { |
8c1d787b | 4105 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4106 | goto drop; |
4107 | } | |
4108 | ||
0b209fae | 4109 | req_seq = __get_reqseq(chan, control); |
218bb9df | 4110 | |
836be934 AE |
4111 | req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); |
4112 | ||
4113 | next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, | |
4114 | chan->expected_ack_seq); | |
218bb9df GP |
4115 | |
4116 | /* check for invalid req-seq */ | |
4117 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 4118 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4119 | goto drop; |
4120 | } | |
4121 | ||
793c2f1c | 4122 | if (!__is_sframe(chan, control)) { |
218bb9df | 4123 | if (len < 0) { |
8c1d787b | 4124 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4125 | goto drop; |
4126 | } | |
4127 | ||
525cd185 | 4128 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
4129 | } else { |
4130 | if (len != 0) { | |
4131 | BT_ERR("%d", len); | |
8c1d787b | 4132 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4133 | goto drop; |
4134 | } | |
4135 | ||
525cd185 | 4136 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
4137 | } |
4138 | ||
4139 | return 0; | |
4140 | ||
4141 | drop: | |
4142 | kfree_skb(skb); | |
4143 | return 0; | |
4144 | } | |
4145 | ||
1da177e4 LT |
4146 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4147 | { | |
48454079 | 4148 | struct l2cap_chan *chan; |
bf734843 | 4149 | struct sock *sk = NULL; |
88843ab0 | 4150 | u32 control; |
fb45de7d | 4151 | u16 tx_seq; |
218bb9df | 4152 | int len; |
1da177e4 | 4153 | |
baa7e1fa | 4154 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4155 | if (!chan) { |
1da177e4 LT |
4156 | BT_DBG("unknown cid 0x%4.4x", cid); |
4157 | goto drop; | |
4158 | } | |
4159 | ||
48454079 | 4160 | sk = chan->sk; |
6840ed07 | 4161 | |
49208c9c | 4162 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4163 | |
89bc500e | 4164 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4165 | goto drop; |
4166 | ||
0c1bc5c6 | 4167 | switch (chan->mode) { |
1c2acffb GP |
4168 | case L2CAP_MODE_BASIC: |
4169 | /* If socket recv buffers overflows we drop data here | |
4170 | * which is *bad* because L2CAP has to be reliable. | |
4171 | * But we don't have any other choice. L2CAP doesn't | |
4172 | * provide flow control mechanism. */ | |
1da177e4 | 4173 | |
0c1bc5c6 | 4174 | if (chan->imtu < skb->len) |
1c2acffb | 4175 | goto drop; |
1da177e4 | 4176 | |
23070494 | 4177 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4178 | goto done; |
4179 | break; | |
4180 | ||
4181 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
4182 | if (!sock_owned_by_user(sk)) { |
4183 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 4184 | } else { |
218bb9df | 4185 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 4186 | goto drop; |
277ffbe3 | 4187 | } |
1c2acffb | 4188 | |
fcafde2e | 4189 | goto done; |
1c2acffb | 4190 | |
6840ed07 | 4191 | case L2CAP_MODE_STREAMING: |
88843ab0 AE |
4192 | control = __get_control(chan, skb->data); |
4193 | skb_pull(skb, __ctrl_size(chan)); | |
6840ed07 GP |
4194 | len = skb->len; |
4195 | ||
47d1ec61 | 4196 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
4197 | goto drop; |
4198 | ||
7e0ef6ee | 4199 | if (__is_sar_start(chan, control)) |
03a51213 | 4200 | len -= L2CAP_SDULEN_SIZE; |
6840ed07 | 4201 | |
47d1ec61 | 4202 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4203 | len -= L2CAP_FCS_SIZE; |
fcc203c3 | 4204 | |
793c2f1c | 4205 | if (len > chan->mps || len < 0 || __is_sframe(chan, control)) |
6840ed07 GP |
4206 | goto drop; |
4207 | ||
fb45de7d | 4208 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 4209 | |
84084a31 MM |
4210 | if (chan->expected_tx_seq != tx_seq) { |
4211 | /* Frame(s) missing - must discard partial SDU */ | |
4212 | kfree_skb(chan->sdu); | |
4213 | chan->sdu = NULL; | |
4214 | chan->sdu_last_frag = NULL; | |
4215 | chan->sdu_len = 0; | |
6840ed07 | 4216 | |
84084a31 MM |
4217 | /* TODO: Notify userland of missing data */ |
4218 | } | |
4219 | ||
836be934 | 4220 | chan->expected_tx_seq = __next_seq(chan, tx_seq); |
84084a31 MM |
4221 | |
4222 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
4223 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
4224 | |
4225 | goto done; | |
4226 | ||
1c2acffb | 4227 | default: |
0c1bc5c6 | 4228 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4229 | break; |
4230 | } | |
1da177e4 LT |
4231 | |
4232 | drop: | |
4233 | kfree_skb(skb); | |
4234 | ||
4235 | done: | |
0139418c MH |
4236 | if (sk) |
4237 | bh_unlock_sock(sk); | |
4238 | ||
1da177e4 LT |
4239 | return 0; |
4240 | } | |
4241 | ||
8e036fc3 | 4242 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4243 | { |
6dcae1ea | 4244 | struct sock *sk = NULL; |
23691d75 | 4245 | struct l2cap_chan *chan; |
1da177e4 | 4246 | |
23691d75 GP |
4247 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
4248 | if (!chan) | |
1da177e4 LT |
4249 | goto drop; |
4250 | ||
23691d75 GP |
4251 | sk = chan->sk; |
4252 | ||
e0f0cb56 GP |
4253 | bh_lock_sock(sk); |
4254 | ||
1da177e4 LT |
4255 | BT_DBG("sk %p, len %d", sk, skb->len); |
4256 | ||
89bc500e | 4257 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4258 | goto drop; |
4259 | ||
e13e21dc | 4260 | if (chan->imtu < skb->len) |
1da177e4 LT |
4261 | goto drop; |
4262 | ||
23070494 | 4263 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
4264 | goto done; |
4265 | ||
4266 | drop: | |
4267 | kfree_skb(skb); | |
4268 | ||
4269 | done: | |
af05b30b GP |
4270 | if (sk) |
4271 | bh_unlock_sock(sk); | |
1da177e4 LT |
4272 | return 0; |
4273 | } | |
4274 | ||
9f69bda6 GP |
4275 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
4276 | { | |
6dcae1ea | 4277 | struct sock *sk = NULL; |
23691d75 | 4278 | struct l2cap_chan *chan; |
9f69bda6 | 4279 | |
23691d75 GP |
4280 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
4281 | if (!chan) | |
9f69bda6 GP |
4282 | goto drop; |
4283 | ||
23691d75 GP |
4284 | sk = chan->sk; |
4285 | ||
9f69bda6 GP |
4286 | bh_lock_sock(sk); |
4287 | ||
4288 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4289 | ||
89bc500e | 4290 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4291 | goto drop; |
4292 | ||
e13e21dc | 4293 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4294 | goto drop; |
4295 | ||
23070494 | 4296 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
4297 | goto done; |
4298 | ||
4299 | drop: | |
4300 | kfree_skb(skb); | |
4301 | ||
4302 | done: | |
4303 | if (sk) | |
4304 | bh_unlock_sock(sk); | |
4305 | return 0; | |
4306 | } | |
4307 | ||
1da177e4 LT |
4308 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4309 | { | |
4310 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4311 | u16 cid, len; |
4312 | __le16 psm; | |
1da177e4 LT |
4313 | |
4314 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4315 | cid = __le16_to_cpu(lh->cid); | |
4316 | len = __le16_to_cpu(lh->len); | |
4317 | ||
1c2acffb GP |
4318 | if (len != skb->len) { |
4319 | kfree_skb(skb); | |
4320 | return; | |
4321 | } | |
4322 | ||
1da177e4 LT |
4323 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4324 | ||
4325 | switch (cid) { | |
3300d9a9 | 4326 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4327 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4328 | l2cap_sig_channel(conn, skb); |
4329 | break; | |
4330 | ||
8db4dc46 | 4331 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4332 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4333 | skb_pull(skb, 2); |
4334 | l2cap_conless_channel(conn, psm, skb); | |
4335 | break; | |
4336 | ||
9f69bda6 GP |
4337 | case L2CAP_CID_LE_DATA: |
4338 | l2cap_att_channel(conn, cid, skb); | |
4339 | break; | |
4340 | ||
b501d6a1 AB |
4341 | case L2CAP_CID_SMP: |
4342 | if (smp_sig_channel(conn, skb)) | |
4343 | l2cap_conn_del(conn->hcon, EACCES); | |
4344 | break; | |
4345 | ||
1da177e4 LT |
4346 | default: |
4347 | l2cap_data_channel(conn, cid, skb); | |
4348 | break; | |
4349 | } | |
4350 | } | |
4351 | ||
4352 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4353 | ||
4354 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4355 | { | |
4356 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4357 | struct l2cap_chan *c; |
1da177e4 LT |
4358 | |
4359 | if (type != ACL_LINK) | |
963cf687 | 4360 | return -EINVAL; |
1da177e4 LT |
4361 | |
4362 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4363 | ||
4364 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4365 | read_lock(&chan_list_lock); |
4366 | list_for_each_entry(c, &chan_list, global_l) { | |
4367 | struct sock *sk = c->sk; | |
4343478f | 4368 | |
89bc500e | 4369 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4370 | continue; |
4371 | ||
4372 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4373 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4374 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4375 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4376 | exact++; |
2af6b9d5 MH |
4377 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4378 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4379 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4380 | lm2 |= HCI_LM_MASTER; |
4381 | } | |
1da177e4 | 4382 | } |
23691d75 | 4383 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4384 | |
4385 | return exact ? lm1 : lm2; | |
4386 | } | |
4387 | ||
4388 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4389 | { | |
0139418c MH |
4390 | struct l2cap_conn *conn; |
4391 | ||
1da177e4 LT |
4392 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4393 | ||
acd7d370 | 4394 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4395 | return -EINVAL; |
1da177e4 LT |
4396 | |
4397 | if (!status) { | |
1da177e4 LT |
4398 | conn = l2cap_conn_add(hcon, status); |
4399 | if (conn) | |
4400 | l2cap_conn_ready(conn); | |
0139418c | 4401 | } else |
e175072f | 4402 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4403 | |
4404 | return 0; | |
4405 | } | |
4406 | ||
2950f21a MH |
4407 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4408 | { | |
4409 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4410 | ||
4411 | BT_DBG("hcon %p", hcon); | |
4412 | ||
b5694506 | 4413 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
9f5a0d7b | 4414 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4415 | |
4416 | return conn->disc_reason; | |
4417 | } | |
4418 | ||
4419 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4420 | { |
4421 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4422 | ||
acd7d370 | 4423 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4424 | return -EINVAL; |
1da177e4 | 4425 | |
e175072f | 4426 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
0139418c | 4427 | |
1da177e4 LT |
4428 | return 0; |
4429 | } | |
4430 | ||
4343478f | 4431 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4432 | { |
715ec005 | 4433 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4434 | return; |
4435 | ||
f62e4323 | 4436 | if (encrypt == 0x00) { |
4343478f | 4437 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 GP |
4438 | __clear_chan_timer(chan); |
4439 | __set_chan_timer(chan, HZ * 5); | |
4343478f | 4440 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4441 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4442 | } else { |
4343478f | 4443 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4444 | __clear_chan_timer(chan); |
f62e4323 MH |
4445 | } |
4446 | } | |
4447 | ||
8c1b2355 | 4448 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4449 | { |
0139418c | 4450 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4451 | struct l2cap_chan *chan; |
1da177e4 | 4452 | |
0139418c | 4453 | if (!conn) |
1da177e4 | 4454 | return 0; |
0139418c | 4455 | |
1da177e4 LT |
4456 | BT_DBG("conn %p", conn); |
4457 | ||
160dc6ac VCG |
4458 | if (hcon->type == LE_LINK) { |
4459 | smp_distribute_keys(conn, 0); | |
4460 | del_timer(&conn->security_timer); | |
4461 | } | |
4462 | ||
baa7e1fa | 4463 | read_lock(&conn->chan_lock); |
1da177e4 | 4464 | |
baa7e1fa | 4465 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 4466 | struct sock *sk = chan->sk; |
baa7e1fa | 4467 | |
1da177e4 LT |
4468 | bh_lock_sock(sk); |
4469 | ||
f1cb9af5 VCG |
4470 | BT_DBG("chan->scid %d", chan->scid); |
4471 | ||
4472 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4473 | if (!status && encrypt) { | |
4474 | chan->sec_level = hcon->sec_level; | |
4475 | l2cap_chan_ready(sk); | |
4476 | } | |
4477 | ||
4478 | bh_unlock_sock(sk); | |
4479 | continue; | |
4480 | } | |
4481 | ||
c1360a1c | 4482 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6a8d3010 MH |
4483 | bh_unlock_sock(sk); |
4484 | continue; | |
4485 | } | |
4486 | ||
89bc500e GP |
4487 | if (!status && (chan->state == BT_CONNECTED || |
4488 | chan->state == BT_CONFIG)) { | |
4343478f | 4489 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4490 | bh_unlock_sock(sk); |
4491 | continue; | |
4492 | } | |
4493 | ||
89bc500e | 4494 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4495 | if (!status) { |
4496 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4497 | req.scid = cpu_to_le16(chan->scid); |
4498 | req.psm = chan->psm; | |
1da177e4 | 4499 | |
fc7f8a7e | 4500 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 4501 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 | 4502 | |
fc7f8a7e | 4503 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4504 | L2CAP_CONN_REQ, sizeof(req), &req); |
4505 | } else { | |
c9b66675 GP |
4506 | __clear_chan_timer(chan); |
4507 | __set_chan_timer(chan, HZ / 10); | |
b1235d79 | 4508 | } |
89bc500e | 4509 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 4510 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4511 | __u16 res, stat; |
1da177e4 | 4512 | |
b1235d79 | 4513 | if (!status) { |
df3c3931 JH |
4514 | if (bt_sk(sk)->defer_setup) { |
4515 | struct sock *parent = bt_sk(sk)->parent; | |
4516 | res = L2CAP_CR_PEND; | |
4517 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4518 | if (parent) |
4519 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4520 | } else { |
05558911 | 4521 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4522 | res = L2CAP_CR_SUCCESS; |
4523 | stat = L2CAP_CS_NO_INFO; | |
4524 | } | |
b1235d79 | 4525 | } else { |
89bc500e | 4526 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 4527 | __set_chan_timer(chan, HZ / 10); |
df3c3931 JH |
4528 | res = L2CAP_CR_SEC_BLOCK; |
4529 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4530 | } |
4531 | ||
fe4128e0 GP |
4532 | rsp.scid = cpu_to_le16(chan->dcid); |
4533 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4534 | rsp.result = cpu_to_le16(res); |
4535 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4536 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4537 | sizeof(rsp), &rsp); | |
b1235d79 | 4538 | } |
1da177e4 LT |
4539 | |
4540 | bh_unlock_sock(sk); | |
4541 | } | |
4542 | ||
baa7e1fa | 4543 | read_unlock(&conn->chan_lock); |
b1235d79 | 4544 | |
1da177e4 LT |
4545 | return 0; |
4546 | } | |
4547 | ||
4548 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4549 | { | |
4550 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4551 | ||
5a08ecce AE |
4552 | if (!conn) |
4553 | conn = l2cap_conn_add(hcon, 0); | |
4554 | ||
4555 | if (!conn) | |
1da177e4 LT |
4556 | goto drop; |
4557 | ||
4558 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4559 | ||
e702112f | 4560 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4561 | struct l2cap_hdr *hdr; |
48454079 | 4562 | struct l2cap_chan *chan; |
89794813 | 4563 | u16 cid; |
1da177e4 LT |
4564 | int len; |
4565 | ||
4566 | if (conn->rx_len) { | |
4567 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4568 | kfree_skb(conn->rx_skb); | |
4569 | conn->rx_skb = NULL; | |
4570 | conn->rx_len = 0; | |
4571 | l2cap_conn_unreliable(conn, ECOMM); | |
4572 | } | |
4573 | ||
aae7fe22 AE |
4574 | /* Start fragment always begin with Basic L2CAP header */ |
4575 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4576 | BT_ERR("Frame is too short (len %d)", skb->len); |
4577 | l2cap_conn_unreliable(conn, ECOMM); | |
4578 | goto drop; | |
4579 | } | |
4580 | ||
4581 | hdr = (struct l2cap_hdr *) skb->data; | |
4582 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4583 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4584 | |
4585 | if (len == skb->len) { | |
4586 | /* Complete frame received */ | |
4587 | l2cap_recv_frame(conn, skb); | |
4588 | return 0; | |
4589 | } | |
4590 | ||
4591 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4592 | ||
4593 | if (skb->len > len) { | |
4594 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4595 | skb->len, len); | |
4596 | l2cap_conn_unreliable(conn, ECOMM); | |
4597 | goto drop; | |
4598 | } | |
4599 | ||
baa7e1fa | 4600 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4601 | |
48454079 GP |
4602 | if (chan && chan->sk) { |
4603 | struct sock *sk = chan->sk; | |
89794813 | 4604 | |
0c1bc5c6 | 4605 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4606 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4607 | "MTU %d)", len, | |
0c1bc5c6 | 4608 | chan->imtu); |
48454079 GP |
4609 | bh_unlock_sock(sk); |
4610 | l2cap_conn_unreliable(conn, ECOMM); | |
4611 | goto drop; | |
4612 | } | |
89794813 | 4613 | bh_unlock_sock(sk); |
48454079 | 4614 | } |
89794813 | 4615 | |
1da177e4 | 4616 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4617 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4618 | if (!conn->rx_skb) | |
1da177e4 LT |
4619 | goto drop; |
4620 | ||
d626f62b | 4621 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4622 | skb->len); |
1da177e4 LT |
4623 | conn->rx_len = len - skb->len; |
4624 | } else { | |
4625 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4626 | ||
4627 | if (!conn->rx_len) { | |
4628 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4629 | l2cap_conn_unreliable(conn, ECOMM); | |
4630 | goto drop; | |
4631 | } | |
4632 | ||
4633 | if (skb->len > conn->rx_len) { | |
4634 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4635 | skb->len, conn->rx_len); | |
4636 | kfree_skb(conn->rx_skb); | |
4637 | conn->rx_skb = NULL; | |
4638 | conn->rx_len = 0; | |
4639 | l2cap_conn_unreliable(conn, ECOMM); | |
4640 | goto drop; | |
4641 | } | |
4642 | ||
d626f62b | 4643 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4644 | skb->len); |
1da177e4 LT |
4645 | conn->rx_len -= skb->len; |
4646 | ||
4647 | if (!conn->rx_len) { | |
4648 | /* Complete frame received */ | |
4649 | l2cap_recv_frame(conn, conn->rx_skb); | |
4650 | conn->rx_skb = NULL; | |
4651 | } | |
4652 | } | |
4653 | ||
4654 | drop: | |
4655 | kfree_skb(skb); | |
4656 | return 0; | |
4657 | } | |
4658 | ||
aef7d97c | 4659 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4660 | { |
23691d75 | 4661 | struct l2cap_chan *c; |
1da177e4 | 4662 | |
23691d75 | 4663 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4664 | |
23691d75 GP |
4665 | list_for_each_entry(c, &chan_list, global_l) { |
4666 | struct sock *sk = c->sk; | |
101545f6 | 4667 | |
903d343e | 4668 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4669 | batostr(&bt_sk(sk)->src), |
4670 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4671 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4672 | c->scid, c->dcid, c->imtu, c->omtu, |
4673 | c->sec_level, c->mode); | |
05558911 | 4674 | } |
1da177e4 | 4675 | |
23691d75 | 4676 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4677 | |
aef7d97c | 4678 | return 0; |
1da177e4 LT |
4679 | } |
4680 | ||
aef7d97c MH |
4681 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4682 | { | |
4683 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4684 | } | |
4685 | ||
4686 | static const struct file_operations l2cap_debugfs_fops = { | |
4687 | .open = l2cap_debugfs_open, | |
4688 | .read = seq_read, | |
4689 | .llseek = seq_lseek, | |
4690 | .release = single_release, | |
4691 | }; | |
4692 | ||
4693 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4694 | |
1da177e4 LT |
4695 | static struct hci_proto l2cap_hci_proto = { |
4696 | .name = "L2CAP", | |
4697 | .id = HCI_PROTO_L2CAP, | |
4698 | .connect_ind = l2cap_connect_ind, | |
4699 | .connect_cfm = l2cap_connect_cfm, | |
4700 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4701 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4702 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4703 | .recv_acldata = l2cap_recv_acldata |
4704 | }; | |
4705 | ||
64274518 | 4706 | int __init l2cap_init(void) |
1da177e4 LT |
4707 | { |
4708 | int err; | |
be9d1227 | 4709 | |
bb58f747 | 4710 | err = l2cap_init_sockets(); |
1da177e4 LT |
4711 | if (err < 0) |
4712 | return err; | |
4713 | ||
1da177e4 LT |
4714 | err = hci_register_proto(&l2cap_hci_proto); |
4715 | if (err < 0) { | |
4716 | BT_ERR("L2CAP protocol registration failed"); | |
4717 | bt_sock_unregister(BTPROTO_L2CAP); | |
4718 | goto error; | |
4719 | } | |
4720 | ||
aef7d97c MH |
4721 | if (bt_debugfs) { |
4722 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4723 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4724 | if (!l2cap_debugfs) | |
4725 | BT_ERR("Failed to create L2CAP debug file"); | |
4726 | } | |
1da177e4 | 4727 | |
1da177e4 LT |
4728 | return 0; |
4729 | ||
4730 | error: | |
bb58f747 | 4731 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4732 | return err; |
4733 | } | |
4734 | ||
64274518 | 4735 | void l2cap_exit(void) |
1da177e4 | 4736 | { |
aef7d97c | 4737 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4738 | |
1da177e4 LT |
4739 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4740 | BT_ERR("L2CAP protocol unregistration failed"); | |
4741 | ||
bb58f747 | 4742 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4743 | } |
4744 | ||
d1c4a17d GP |
4745 | module_param(disable_ertm, bool, 0644); |
4746 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); | |
a5fd6f30 AE |
4747 | |
4748 | module_param(enable_hs, bool, 0644); | |
4749 | MODULE_PARM_DESC(enable_hs, "Enable High Speed"); |