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; |
f0709e03 | 60 | |
47ec1dcd | 61 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 62 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 63 | |
b5ad8b7f JB |
64 | static LIST_HEAD(chan_list); |
65 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 66 | |
1da177e4 LT |
67 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
68 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
69 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
70 | void *data); | |
710f9b0a | 71 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
72 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
73 | struct l2cap_chan *chan, int err); | |
1da177e4 | 74 | |
218bb9df GP |
75 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
76 | ||
0139418c | 77 | /* ---- L2CAP channels ---- */ |
71ba0e56 GP |
78 | |
79 | static inline void chan_hold(struct l2cap_chan *c) | |
80 | { | |
81 | atomic_inc(&c->refcnt); | |
82 | } | |
83 | ||
84 | static inline void chan_put(struct l2cap_chan *c) | |
85 | { | |
86 | if (atomic_dec_and_test(&c->refcnt)) | |
87 | kfree(c); | |
88 | } | |
89 | ||
baa7e1fa | 90 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 91 | { |
48454079 | 92 | struct l2cap_chan *c; |
baa7e1fa GP |
93 | |
94 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 95 | if (c->dcid == cid) |
baa7e1fa | 96 | return c; |
0139418c | 97 | } |
baa7e1fa | 98 | return NULL; |
0139418c MH |
99 | } |
100 | ||
baa7e1fa | 101 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 102 | { |
48454079 | 103 | struct l2cap_chan *c; |
baa7e1fa GP |
104 | |
105 | list_for_each_entry(c, &conn->chan_l, list) { | |
fe4128e0 | 106 | if (c->scid == cid) |
baa7e1fa | 107 | return c; |
0139418c | 108 | } |
baa7e1fa | 109 | return NULL; |
0139418c MH |
110 | } |
111 | ||
112 | /* Find channel with given SCID. | |
113 | * Returns locked socket */ | |
baa7e1fa | 114 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 115 | { |
48454079 | 116 | struct l2cap_chan *c; |
baa7e1fa GP |
117 | |
118 | read_lock(&conn->chan_lock); | |
119 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
120 | if (c) |
121 | bh_lock_sock(c->sk); | |
baa7e1fa | 122 | read_unlock(&conn->chan_lock); |
48454079 | 123 | return c; |
0139418c MH |
124 | } |
125 | ||
baa7e1fa | 126 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 127 | { |
48454079 | 128 | struct l2cap_chan *c; |
baa7e1fa GP |
129 | |
130 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 131 | if (c->ident == ident) |
baa7e1fa | 132 | return c; |
0139418c | 133 | } |
baa7e1fa | 134 | return NULL; |
0139418c MH |
135 | } |
136 | ||
baa7e1fa | 137 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 138 | { |
48454079 | 139 | struct l2cap_chan *c; |
baa7e1fa GP |
140 | |
141 | read_lock(&conn->chan_lock); | |
142 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
143 | if (c) |
144 | bh_lock_sock(c->sk); | |
baa7e1fa | 145 | read_unlock(&conn->chan_lock); |
48454079 | 146 | return c; |
0139418c MH |
147 | } |
148 | ||
23691d75 | 149 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 150 | { |
23691d75 | 151 | struct l2cap_chan *c; |
9e4425ff | 152 | |
23691d75 GP |
153 | list_for_each_entry(c, &chan_list, global_l) { |
154 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 155 | return c; |
9e4425ff | 156 | } |
250938cb | 157 | return NULL; |
9e4425ff GP |
158 | } |
159 | ||
160 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
161 | { | |
73b2ec18 GP |
162 | int err; |
163 | ||
23691d75 | 164 | write_lock_bh(&chan_list_lock); |
9e4425ff | 165 | |
23691d75 | 166 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
167 | err = -EADDRINUSE; |
168 | goto done; | |
9e4425ff GP |
169 | } |
170 | ||
73b2ec18 GP |
171 | if (psm) { |
172 | chan->psm = psm; | |
173 | chan->sport = psm; | |
174 | err = 0; | |
175 | } else { | |
176 | u16 p; | |
177 | ||
178 | err = -EINVAL; | |
179 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 180 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
181 | chan->psm = cpu_to_le16(p); |
182 | chan->sport = cpu_to_le16(p); | |
183 | err = 0; | |
184 | break; | |
185 | } | |
186 | } | |
9e4425ff | 187 | |
73b2ec18 | 188 | done: |
23691d75 | 189 | write_unlock_bh(&chan_list_lock); |
73b2ec18 | 190 | return err; |
9e4425ff GP |
191 | } |
192 | ||
193 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
194 | { | |
23691d75 | 195 | write_lock_bh(&chan_list_lock); |
9e4425ff GP |
196 | |
197 | chan->scid = scid; | |
198 | ||
23691d75 | 199 | write_unlock_bh(&chan_list_lock); |
9e4425ff GP |
200 | |
201 | return 0; | |
202 | } | |
203 | ||
baa7e1fa | 204 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 205 | { |
8db4dc46 | 206 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 207 | |
8db4dc46 | 208 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 209 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
210 | return cid; |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
c9b66675 | 216 | static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout) |
ab07801d | 217 | { |
457f4850 | 218 | BT_DBG("chan %p state %d timeout %ld", chan, chan->state, timeout); |
89bc500e | 219 | |
942ecc9c | 220 | if (!mod_timer(timer, jiffies + msecs_to_jiffies(timeout))) |
774e5651 | 221 | chan_hold(chan); |
ab07801d GP |
222 | } |
223 | ||
c9b66675 | 224 | static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer) |
ab07801d | 225 | { |
774e5651 | 226 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d | 227 | |
774e5651 MM |
228 | if (timer_pending(timer) && del_timer(timer)) |
229 | chan_put(chan); | |
ab07801d GP |
230 | } |
231 | ||
badaaa00 GP |
232 | static char *state_to_string(int state) |
233 | { | |
234 | switch(state) { | |
235 | case BT_CONNECTED: | |
236 | return "BT_CONNECTED"; | |
237 | case BT_OPEN: | |
238 | return "BT_OPEN"; | |
239 | case BT_BOUND: | |
240 | return "BT_BOUND"; | |
241 | case BT_LISTEN: | |
242 | return "BT_LISTEN"; | |
243 | case BT_CONNECT: | |
244 | return "BT_CONNECT"; | |
245 | case BT_CONNECT2: | |
246 | return "BT_CONNECT2"; | |
247 | case BT_CONFIG: | |
248 | return "BT_CONFIG"; | |
249 | case BT_DISCONN: | |
250 | return "BT_DISCONN"; | |
251 | case BT_CLOSED: | |
252 | return "BT_CLOSED"; | |
253 | } | |
254 | ||
255 | return "invalid state"; | |
256 | } | |
257 | ||
89bc500e GP |
258 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
259 | { | |
badaaa00 GP |
260 | BT_DBG("%p %s -> %s", chan, state_to_string(chan->state), |
261 | state_to_string(state)); | |
262 | ||
89bc500e GP |
263 | chan->state = state; |
264 | chan->ops->state_change(chan->data, state); | |
265 | } | |
266 | ||
ab07801d GP |
267 | static void l2cap_chan_timeout(unsigned long arg) |
268 | { | |
269 | struct l2cap_chan *chan = (struct l2cap_chan *) arg; | |
270 | struct sock *sk = chan->sk; | |
271 | int reason; | |
272 | ||
89bc500e | 273 | BT_DBG("chan %p state %d", chan, chan->state); |
ab07801d GP |
274 | |
275 | bh_lock_sock(sk); | |
276 | ||
277 | if (sock_owned_by_user(sk)) { | |
278 | /* sk is owned by user. Try again later */ | |
f3f668b0 | 279 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
ab07801d | 280 | bh_unlock_sock(sk); |
71ba0e56 | 281 | chan_put(chan); |
ab07801d GP |
282 | return; |
283 | } | |
284 | ||
89bc500e | 285 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 286 | reason = ECONNREFUSED; |
89bc500e | 287 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
288 | chan->sec_level != BT_SECURITY_SDP) |
289 | reason = ECONNREFUSED; | |
290 | else | |
291 | reason = ETIMEDOUT; | |
292 | ||
0f852724 | 293 | l2cap_chan_close(chan, reason); |
ab07801d GP |
294 | |
295 | bh_unlock_sock(sk); | |
296 | ||
ba3bd0ee | 297 | chan->ops->close(chan->data); |
71ba0e56 | 298 | chan_put(chan); |
ab07801d GP |
299 | } |
300 | ||
23691d75 | 301 | struct l2cap_chan *l2cap_chan_create(struct sock *sk) |
48454079 GP |
302 | { |
303 | struct l2cap_chan *chan; | |
304 | ||
305 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
306 | if (!chan) | |
307 | return NULL; | |
308 | ||
309 | chan->sk = sk; | |
310 | ||
23691d75 GP |
311 | write_lock_bh(&chan_list_lock); |
312 | list_add(&chan->global_l, &chan_list); | |
313 | write_unlock_bh(&chan_list_lock); | |
314 | ||
ab07801d GP |
315 | setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan); |
316 | ||
89bc500e GP |
317 | chan->state = BT_OPEN; |
318 | ||
71ba0e56 GP |
319 | atomic_set(&chan->refcnt, 1); |
320 | ||
abc545b8 SJ |
321 | BT_DBG("sk %p chan %p", sk, chan); |
322 | ||
48454079 GP |
323 | return chan; |
324 | } | |
325 | ||
23691d75 | 326 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 327 | { |
23691d75 GP |
328 | write_lock_bh(&chan_list_lock); |
329 | list_del(&chan->global_l); | |
330 | write_unlock_bh(&chan_list_lock); | |
331 | ||
71ba0e56 | 332 | chan_put(chan); |
6ff5abbf GP |
333 | } |
334 | ||
48454079 | 335 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 336 | { |
af05b30b | 337 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
fe4128e0 | 338 | chan->psm, chan->dcid); |
0139418c | 339 | |
9f5a0d7b | 340 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 341 | |
8c1d787b | 342 | chan->conn = conn; |
0139418c | 343 | |
715ec005 | 344 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
b62f328b VT |
345 | if (conn->hcon->type == LE_LINK) { |
346 | /* LE connection */ | |
0c1bc5c6 | 347 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
348 | chan->scid = L2CAP_CID_LE_DATA; |
349 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
350 | } else { |
351 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 352 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 353 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 354 | } |
715ec005 | 355 | } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
0139418c | 356 | /* Connectionless socket */ |
fe4128e0 GP |
357 | chan->scid = L2CAP_CID_CONN_LESS; |
358 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 359 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
360 | } else { |
361 | /* Raw socket can send/recv signalling messages only */ | |
fe4128e0 GP |
362 | chan->scid = L2CAP_CID_SIGNALING; |
363 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 364 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
365 | } |
366 | ||
8f7975b1 AE |
367 | chan->local_id = L2CAP_BESTEFFORT_ID; |
368 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
369 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
370 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
371 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
372 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
373 | ||
71ba0e56 | 374 | chan_hold(chan); |
baa7e1fa GP |
375 | |
376 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
377 | } |
378 | ||
8e87d142 | 379 | /* Delete channel. |
0139418c | 380 | * Must be called on the locked socket. */ |
4519de9a | 381 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 382 | { |
48454079 | 383 | struct sock *sk = chan->sk; |
8c1d787b | 384 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
385 | struct sock *parent = bt_sk(sk)->parent; |
386 | ||
c9b66675 | 387 | __clear_chan_timer(chan); |
0139418c | 388 | |
49208c9c | 389 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 390 | |
8e87d142 | 391 | if (conn) { |
baa7e1fa GP |
392 | /* Delete from channel list */ |
393 | write_lock_bh(&conn->chan_lock); | |
394 | list_del(&chan->list); | |
395 | write_unlock_bh(&conn->chan_lock); | |
71ba0e56 | 396 | chan_put(chan); |
baa7e1fa | 397 | |
8c1d787b | 398 | chan->conn = NULL; |
0139418c MH |
399 | hci_conn_put(conn->hcon); |
400 | } | |
401 | ||
89bc500e | 402 | l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
403 | sock_set_flag(sk, SOCK_ZAPPED); |
404 | ||
405 | if (err) | |
406 | sk->sk_err = err; | |
407 | ||
408 | if (parent) { | |
409 | bt_accept_unlink(sk); | |
410 | parent->sk_data_ready(parent, 0); | |
411 | } else | |
412 | sk->sk_state_change(sk); | |
c13ffa62 | 413 | |
c1360a1c GP |
414 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
415 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 416 | return; |
2ead70b8 | 417 | |
58d35f87 | 418 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 419 | |
0c1bc5c6 | 420 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
421 | struct srej_list *l, *tmp; |
422 | ||
1a09bcb9 GP |
423 | __clear_retrans_timer(chan); |
424 | __clear_monitor_timer(chan); | |
425 | __clear_ack_timer(chan); | |
c13ffa62 | 426 | |
f1c6775b | 427 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 428 | |
39d5a3ee | 429 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
430 | list_del(&l->list); |
431 | kfree(l); | |
432 | } | |
433 | } | |
0139418c MH |
434 | } |
435 | ||
4519de9a GP |
436 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
437 | { | |
438 | struct sock *sk; | |
439 | ||
440 | BT_DBG("parent %p", parent); | |
441 | ||
442 | /* Close not yet accepted channels */ | |
0f852724 | 443 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 444 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
c9b66675 | 445 | __clear_chan_timer(chan); |
0f852724 | 446 | lock_sock(sk); |
ba3bd0ee | 447 | l2cap_chan_close(chan, ECONNRESET); |
0f852724 | 448 | release_sock(sk); |
ba3bd0ee | 449 | chan->ops->close(chan->data); |
0f852724 | 450 | } |
4519de9a GP |
451 | } |
452 | ||
0f852724 | 453 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
454 | { |
455 | struct l2cap_conn *conn = chan->conn; | |
456 | struct sock *sk = chan->sk; | |
457 | ||
89bc500e | 458 | BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket); |
4519de9a | 459 | |
89bc500e | 460 | switch (chan->state) { |
4519de9a GP |
461 | case BT_LISTEN: |
462 | l2cap_chan_cleanup_listen(sk); | |
89bc500e GP |
463 | |
464 | l2cap_state_change(chan, BT_CLOSED); | |
465 | sock_set_flag(sk, SOCK_ZAPPED); | |
4519de9a GP |
466 | break; |
467 | ||
468 | case BT_CONNECTED: | |
469 | case BT_CONFIG: | |
715ec005 | 470 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 471 | conn->hcon->type == ACL_LINK) { |
c9b66675 GP |
472 | __clear_chan_timer(chan); |
473 | __set_chan_timer(chan, sk->sk_sndtimeo); | |
4519de9a GP |
474 | l2cap_send_disconn_req(conn, chan, reason); |
475 | } else | |
476 | l2cap_chan_del(chan, reason); | |
477 | break; | |
478 | ||
479 | case BT_CONNECT2: | |
715ec005 | 480 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
481 | conn->hcon->type == ACL_LINK) { |
482 | struct l2cap_conn_rsp rsp; | |
483 | __u16 result; | |
484 | ||
485 | if (bt_sk(sk)->defer_setup) | |
486 | result = L2CAP_CR_SEC_BLOCK; | |
487 | else | |
488 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 489 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
490 | |
491 | rsp.scid = cpu_to_le16(chan->dcid); | |
492 | rsp.dcid = cpu_to_le16(chan->scid); | |
493 | rsp.result = cpu_to_le16(result); | |
494 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
495 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
496 | sizeof(rsp), &rsp); | |
497 | } | |
498 | ||
499 | l2cap_chan_del(chan, reason); | |
500 | break; | |
501 | ||
502 | case BT_CONNECT: | |
503 | case BT_DISCONN: | |
504 | l2cap_chan_del(chan, reason); | |
505 | break; | |
506 | ||
507 | default: | |
508 | sock_set_flag(sk, SOCK_ZAPPED); | |
509 | break; | |
510 | } | |
511 | } | |
512 | ||
4343478f | 513 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 514 | { |
715ec005 | 515 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 516 | switch (chan->sec_level) { |
8556edd3 JH |
517 | case BT_SECURITY_HIGH: |
518 | return HCI_AT_DEDICATED_BONDING_MITM; | |
519 | case BT_SECURITY_MEDIUM: | |
520 | return HCI_AT_DEDICATED_BONDING; | |
521 | default: | |
522 | return HCI_AT_NO_BONDING; | |
523 | } | |
fe4128e0 | 524 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
525 | if (chan->sec_level == BT_SECURITY_LOW) |
526 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 527 | |
4343478f | 528 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 529 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 530 | else |
8556edd3 | 531 | return HCI_AT_NO_BONDING; |
00ae4af9 | 532 | } else { |
4343478f | 533 | switch (chan->sec_level) { |
00ae4af9 | 534 | case BT_SECURITY_HIGH: |
8556edd3 | 535 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 536 | case BT_SECURITY_MEDIUM: |
8556edd3 | 537 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 538 | default: |
8556edd3 | 539 | return HCI_AT_NO_BONDING; |
00ae4af9 | 540 | } |
0684e5f9 | 541 | } |
8556edd3 JH |
542 | } |
543 | ||
544 | /* Service level security */ | |
d45fc423 | 545 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 546 | { |
8c1d787b | 547 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
548 | __u8 auth_type; |
549 | ||
4343478f | 550 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 551 | |
4343478f | 552 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
553 | } |
554 | ||
b5ad8b7f | 555 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
556 | { |
557 | u8 id; | |
558 | ||
559 | /* Get next available identificator. | |
560 | * 1 - 128 are used by kernel. | |
561 | * 129 - 199 are reserved. | |
562 | * 200 - 254 are used by utilities like l2ping, etc. | |
563 | */ | |
564 | ||
565 | spin_lock_bh(&conn->lock); | |
566 | ||
567 | if (++conn->tx_ident > 128) | |
568 | conn->tx_ident = 1; | |
569 | ||
570 | id = conn->tx_ident; | |
571 | ||
572 | spin_unlock_bh(&conn->lock); | |
573 | ||
574 | return id; | |
575 | } | |
576 | ||
4519de9a | 577 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
578 | { |
579 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 580 | u8 flags; |
4e8402a3 MH |
581 | |
582 | BT_DBG("code 0x%2.2x", code); | |
583 | ||
584 | if (!skb) | |
9a9c6a34 | 585 | return; |
4e8402a3 | 586 | |
e702112f AE |
587 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
588 | flags = ACL_START_NO_FLUSH; | |
589 | else | |
590 | flags = ACL_START; | |
591 | ||
14b12d0b | 592 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 593 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 594 | |
73d80deb LAD |
595 | hci_send_acl(conn->hchan, skb, flags); |
596 | } | |
597 | ||
598 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
599 | { | |
600 | struct hci_conn *hcon = chan->conn->hcon; | |
601 | u16 flags; | |
602 | ||
603 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
604 | skb->priority); | |
605 | ||
606 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
607 | lmp_no_flush_capable(hcon->hdev)) | |
608 | flags = ACL_START_NO_FLUSH; | |
609 | else | |
610 | flags = ACL_START; | |
14b12d0b | 611 | |
73d80deb LAD |
612 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
613 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
614 | } |
615 | ||
88843ab0 | 616 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) |
1c2acffb GP |
617 | { |
618 | struct sk_buff *skb; | |
619 | struct l2cap_hdr *lh; | |
8c1d787b | 620 | struct l2cap_conn *conn = chan->conn; |
e4ca6d98 | 621 | int count, hlen; |
fcc203c3 | 622 | |
89bc500e | 623 | if (chan->state != BT_CONNECTED) |
c13ffa62 GP |
624 | return; |
625 | ||
e4ca6d98 AE |
626 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
627 | hlen = L2CAP_EXT_HDR_SIZE; | |
628 | else | |
629 | hlen = L2CAP_ENH_HDR_SIZE; | |
630 | ||
47d1ec61 | 631 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 632 | hlen += L2CAP_FCS_SIZE; |
1c2acffb | 633 | |
88843ab0 | 634 | BT_DBG("chan %p, control 0x%8.8x", chan, control); |
1c2acffb | 635 | |
fcc203c3 | 636 | count = min_t(unsigned int, conn->mtu, hlen); |
793c2f1c AE |
637 | |
638 | control |= __set_sframe(chan); | |
1c2acffb | 639 | |
e2ab4353 | 640 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 641 | control |= __set_ctrl_final(chan); |
9e917af1 | 642 | |
e2ab4353 | 643 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) |
e3781735 | 644 | control |= __set_ctrl_poll(chan); |
f0946ccf | 645 | |
1c2acffb GP |
646 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
647 | if (!skb) | |
9a9c6a34 | 648 | return; |
1c2acffb GP |
649 | |
650 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 651 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
fe4128e0 | 652 | lh->cid = cpu_to_le16(chan->dcid); |
88843ab0 AE |
653 | |
654 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1c2acffb | 655 | |
47d1ec61 | 656 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
657 | u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); |
658 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
659 | } |
660 | ||
73d80deb LAD |
661 | skb->priority = HCI_PRIO_MAX; |
662 | l2cap_do_send(chan, skb); | |
1c2acffb GP |
663 | } |
664 | ||
88843ab0 | 665 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) |
7e743090 | 666 | { |
e2ab4353 | 667 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 668 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 669 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
1890d36b | 670 | } else |
ab784b73 | 671 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
7e743090 | 672 | |
0b209fae | 673 | control |= __set_reqseq(chan, chan->buffer_seq); |
2ab25cdd | 674 | |
525cd185 | 675 | l2cap_send_sframe(chan, control); |
7e743090 GP |
676 | } |
677 | ||
b4450035 | 678 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 679 | { |
c1360a1c | 680 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
681 | } |
682 | ||
fc7f8a7e | 683 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 684 | { |
8c1d787b | 685 | struct l2cap_conn *conn = chan->conn; |
79d554a6 MH |
686 | |
687 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
688 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
689 | return; | |
690 | ||
d45fc423 | 691 | if (l2cap_chan_check_security(chan) && |
4343478f | 692 | __l2cap_no_conn_pending(chan)) { |
b1235d79 | 693 | struct l2cap_conn_req req; |
fe4128e0 GP |
694 | req.scid = cpu_to_le16(chan->scid); |
695 | req.psm = chan->psm; | |
79d554a6 | 696 | |
fc7f8a7e | 697 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 698 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
79d554a6 | 699 | |
fc7f8a7e GP |
700 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
701 | sizeof(req), &req); | |
b1235d79 | 702 | } |
79d554a6 MH |
703 | } else { |
704 | struct l2cap_info_req req; | |
705 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
706 | ||
707 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
708 | conn->info_ident = l2cap_get_ident(conn); | |
709 | ||
710 | mod_timer(&conn->info_timer, jiffies + | |
711 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
712 | ||
713 | l2cap_send_cmd(conn, conn->info_ident, | |
714 | L2CAP_INFO_REQ, sizeof(req), &req); | |
715 | } | |
716 | } | |
717 | ||
cf6c2c0b GP |
718 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
719 | { | |
720 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 721 | if (!disable_ertm) |
cf6c2c0b GP |
722 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
723 | ||
724 | switch (mode) { | |
725 | case L2CAP_MODE_ERTM: | |
726 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
727 | case L2CAP_MODE_STREAMING: | |
728 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
729 | default: | |
730 | return 0x00; | |
731 | } | |
732 | } | |
733 | ||
4519de9a | 734 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 735 | { |
e92c8e70 | 736 | struct sock *sk; |
22121fc9 GP |
737 | struct l2cap_disconn_req req; |
738 | ||
c13ffa62 GP |
739 | if (!conn) |
740 | return; | |
741 | ||
e92c8e70 GP |
742 | sk = chan->sk; |
743 | ||
0c1bc5c6 | 744 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
745 | __clear_retrans_timer(chan); |
746 | __clear_monitor_timer(chan); | |
747 | __clear_ack_timer(chan); | |
c13ffa62 GP |
748 | } |
749 | ||
fe4128e0 GP |
750 | req.dcid = cpu_to_le16(chan->dcid); |
751 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
752 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
753 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 754 | |
89bc500e | 755 | l2cap_state_change(chan, BT_DISCONN); |
9b108fc0 | 756 | sk->sk_err = err; |
22121fc9 GP |
757 | } |
758 | ||
1da177e4 | 759 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
760 | static void l2cap_conn_start(struct l2cap_conn *conn) |
761 | { | |
820ffdb3 | 762 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
763 | |
764 | BT_DBG("conn %p", conn); | |
765 | ||
baa7e1fa | 766 | read_lock(&conn->chan_lock); |
4e8402a3 | 767 | |
820ffdb3 | 768 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 769 | struct sock *sk = chan->sk; |
baa7e1fa | 770 | |
4e8402a3 MH |
771 | bh_lock_sock(sk); |
772 | ||
715ec005 | 773 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
79d554a6 MH |
774 | bh_unlock_sock(sk); |
775 | continue; | |
776 | } | |
777 | ||
89bc500e | 778 | if (chan->state == BT_CONNECT) { |
47731de7 | 779 | struct l2cap_conn_req req; |
79d554a6 | 780 | |
d45fc423 | 781 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 782 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
783 | bh_unlock_sock(sk); |
784 | continue; | |
785 | } | |
79d554a6 | 786 | |
c1360a1c GP |
787 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
788 | && test_bit(CONF_STATE2_DEVICE, | |
789 | &chan->conf_state)) { | |
0f852724 | 790 | /* l2cap_chan_close() calls list_del(chan) |
820ffdb3 | 791 | * so release the lock */ |
2461daac | 792 | read_unlock(&conn->chan_lock); |
89bc500e | 793 | l2cap_chan_close(chan, ECONNRESET); |
2461daac | 794 | read_lock(&conn->chan_lock); |
47731de7 GP |
795 | bh_unlock_sock(sk); |
796 | continue; | |
b1235d79 | 797 | } |
47731de7 | 798 | |
fe4128e0 GP |
799 | req.scid = cpu_to_le16(chan->scid); |
800 | req.psm = chan->psm; | |
47731de7 | 801 | |
fc7f8a7e | 802 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 803 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
47731de7 | 804 | |
fc7f8a7e GP |
805 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
806 | sizeof(req), &req); | |
47731de7 | 807 | |
89bc500e | 808 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 809 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 810 | char buf[128]; |
fe4128e0 GP |
811 | rsp.scid = cpu_to_le16(chan->dcid); |
812 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 813 | |
d45fc423 | 814 | if (l2cap_chan_check_security(chan)) { |
f66dc81f MH |
815 | if (bt_sk(sk)->defer_setup) { |
816 | struct sock *parent = bt_sk(sk)->parent; | |
817 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
818 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
819 | if (parent) |
820 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
821 | |
822 | } else { | |
89bc500e | 823 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
824 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
825 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
826 | } | |
79d554a6 MH |
827 | } else { |
828 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
829 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
830 | } | |
831 | ||
fc7f8a7e GP |
832 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
833 | sizeof(rsp), &rsp); | |
e9aeb2dd | 834 | |
c1360a1c | 835 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd GP |
836 | rsp.result != L2CAP_CR_SUCCESS) { |
837 | bh_unlock_sock(sk); | |
838 | continue; | |
839 | } | |
840 | ||
c1360a1c | 841 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 842 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
843 | l2cap_build_conf_req(chan, buf), buf); |
844 | chan->num_conf_req++; | |
4e8402a3 MH |
845 | } |
846 | ||
847 | bh_unlock_sock(sk); | |
848 | } | |
849 | ||
baa7e1fa | 850 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
851 | } |
852 | ||
b62f328b VT |
853 | /* Find socket with cid and source bdaddr. |
854 | * Returns closest match, locked. | |
855 | */ | |
23691d75 | 856 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src) |
b62f328b | 857 | { |
23691d75 | 858 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 859 | |
23691d75 | 860 | read_lock(&chan_list_lock); |
b62f328b | 861 | |
23691d75 GP |
862 | list_for_each_entry(c, &chan_list, global_l) { |
863 | struct sock *sk = c->sk; | |
fe4128e0 | 864 | |
89bc500e | 865 | if (state && c->state != state) |
b62f328b VT |
866 | continue; |
867 | ||
23691d75 | 868 | if (c->scid == cid) { |
b62f328b | 869 | /* Exact match. */ |
23691d75 GP |
870 | if (!bacmp(&bt_sk(sk)->src, src)) { |
871 | read_unlock(&chan_list_lock); | |
872 | return c; | |
873 | } | |
b62f328b VT |
874 | |
875 | /* Closest match */ | |
876 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 877 | c1 = c; |
b62f328b VT |
878 | } |
879 | } | |
280f294f | 880 | |
23691d75 | 881 | read_unlock(&chan_list_lock); |
b62f328b | 882 | |
23691d75 | 883 | return c1; |
b62f328b VT |
884 | } |
885 | ||
886 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
887 | { | |
c916fbe4 | 888 | struct sock *parent, *sk; |
23691d75 | 889 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
890 | |
891 | BT_DBG(""); | |
892 | ||
893 | /* Check if we have socket listening on cid */ | |
23691d75 | 894 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
b62f328b | 895 | conn->src); |
23691d75 | 896 | if (!pchan) |
b62f328b VT |
897 | return; |
898 | ||
23691d75 GP |
899 | parent = pchan->sk; |
900 | ||
62f3a2cf GP |
901 | bh_lock_sock(parent); |
902 | ||
b62f328b VT |
903 | /* Check for backlog size */ |
904 | if (sk_acceptq_is_full(parent)) { | |
905 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
906 | goto clean; | |
907 | } | |
908 | ||
80808e43 GP |
909 | chan = pchan->ops->new_connection(pchan->data); |
910 | if (!chan) | |
b62f328b VT |
911 | goto clean; |
912 | ||
80808e43 | 913 | sk = chan->sk; |
5d41ce1d | 914 | |
baa7e1fa | 915 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
916 | |
917 | hci_conn_hold(conn->hcon); | |
918 | ||
b62f328b VT |
919 | bacpy(&bt_sk(sk)->src, conn->src); |
920 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
921 | ||
d1010240 GP |
922 | bt_accept_enqueue(parent, sk); |
923 | ||
48454079 GP |
924 | __l2cap_chan_add(conn, chan); |
925 | ||
c9b66675 | 926 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 927 | |
89bc500e | 928 | l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
929 | parent->sk_data_ready(parent, 0); |
930 | ||
baa7e1fa | 931 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
932 | |
933 | clean: | |
934 | bh_unlock_sock(parent); | |
935 | } | |
936 | ||
f1cb9af5 VCG |
937 | static void l2cap_chan_ready(struct sock *sk) |
938 | { | |
939 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
940 | struct sock *parent = bt_sk(sk)->parent; | |
941 | ||
942 | BT_DBG("sk %p, parent %p", sk, parent); | |
943 | ||
944 | chan->conf_state = 0; | |
945 | __clear_chan_timer(chan); | |
946 | ||
43f3dc41 | 947 | l2cap_state_change(chan, BT_CONNECTED); |
f1cb9af5 VCG |
948 | sk->sk_state_change(sk); |
949 | ||
950 | if (parent) | |
951 | parent->sk_data_ready(parent, 0); | |
952 | } | |
953 | ||
4e8402a3 MH |
954 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
955 | { | |
48454079 | 956 | struct l2cap_chan *chan; |
4e8402a3 | 957 | |
79d554a6 | 958 | BT_DBG("conn %p", conn); |
4e8402a3 | 959 | |
b62f328b VT |
960 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
961 | l2cap_le_conn_ready(conn); | |
962 | ||
160dc6ac VCG |
963 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
964 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
965 | ||
baa7e1fa | 966 | read_lock(&conn->chan_lock); |
4e8402a3 | 967 | |
baa7e1fa | 968 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 969 | struct sock *sk = chan->sk; |
baa7e1fa | 970 | |
79d554a6 | 971 | bh_lock_sock(sk); |
4e8402a3 | 972 | |
63128451 | 973 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 974 | if (smp_conn_security(conn, chan->sec_level)) |
f1cb9af5 | 975 | l2cap_chan_ready(sk); |
acd7d370 | 976 | |
63128451 | 977 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 978 | __clear_chan_timer(chan); |
89bc500e | 979 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 980 | sk->sk_state_change(sk); |
b501d6a1 | 981 | |
89bc500e | 982 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 983 | l2cap_do_start(chan); |
4e8402a3 | 984 | |
79d554a6 | 985 | bh_unlock_sock(sk); |
4e8402a3 | 986 | } |
79d554a6 | 987 | |
baa7e1fa | 988 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
989 | } |
990 | ||
991 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
992 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
993 | { | |
48454079 | 994 | struct l2cap_chan *chan; |
4e8402a3 MH |
995 | |
996 | BT_DBG("conn %p", conn); | |
997 | ||
baa7e1fa | 998 | read_lock(&conn->chan_lock); |
4e8402a3 | 999 | |
baa7e1fa | 1000 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 1001 | struct sock *sk = chan->sk; |
baa7e1fa | 1002 | |
ecf61bdb | 1003 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
4e8402a3 MH |
1004 | sk->sk_err = err; |
1005 | } | |
1006 | ||
baa7e1fa | 1007 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
1008 | } |
1009 | ||
1010 | static void l2cap_info_timeout(unsigned long arg) | |
1011 | { | |
1012 | struct l2cap_conn *conn = (void *) arg; | |
1013 | ||
984947dc | 1014 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1015 | conn->info_ident = 0; |
984947dc | 1016 | |
4e8402a3 MH |
1017 | l2cap_conn_start(conn); |
1018 | } | |
1019 | ||
5d3de7df VCG |
1020 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1021 | { | |
1022 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1023 | struct l2cap_chan *chan, *l; | |
1024 | struct sock *sk; | |
1025 | ||
1026 | if (!conn) | |
1027 | return; | |
1028 | ||
1029 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1030 | ||
1031 | kfree_skb(conn->rx_skb); | |
1032 | ||
1033 | /* Kill channels */ | |
1034 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
1035 | sk = chan->sk; | |
1036 | bh_lock_sock(sk); | |
1037 | l2cap_chan_del(chan, err); | |
1038 | bh_unlock_sock(sk); | |
1039 | chan->ops->close(chan->data); | |
1040 | } | |
1041 | ||
73d80deb LAD |
1042 | hci_chan_del(conn->hchan); |
1043 | ||
5d3de7df VCG |
1044 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
1045 | del_timer_sync(&conn->info_timer); | |
1046 | ||
d26a2345 | 1047 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) { |
5d3de7df | 1048 | del_timer(&conn->security_timer); |
8aab4757 | 1049 | smp_chan_destroy(conn); |
d26a2345 | 1050 | } |
5d3de7df VCG |
1051 | |
1052 | hcon->l2cap_data = NULL; | |
1053 | kfree(conn); | |
1054 | } | |
1055 | ||
1056 | static void security_timeout(unsigned long arg) | |
1057 | { | |
1058 | struct l2cap_conn *conn = (void *) arg; | |
1059 | ||
1060 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1064 | { | |
0139418c | 1065 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1066 | struct hci_chan *hchan; |
1da177e4 | 1067 | |
0139418c | 1068 | if (conn || status) |
1da177e4 LT |
1069 | return conn; |
1070 | ||
73d80deb LAD |
1071 | hchan = hci_chan_create(hcon); |
1072 | if (!hchan) | |
1073 | return NULL; | |
1074 | ||
0139418c | 1075 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1076 | if (!conn) { |
1077 | hci_chan_del(hchan); | |
1da177e4 | 1078 | return NULL; |
73d80deb | 1079 | } |
1da177e4 LT |
1080 | |
1081 | hcon->l2cap_data = conn; | |
1082 | conn->hcon = hcon; | |
73d80deb | 1083 | conn->hchan = hchan; |
1da177e4 | 1084 | |
73d80deb | 1085 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1086 | |
acd7d370 VT |
1087 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1088 | conn->mtu = hcon->hdev->le_mtu; | |
1089 | else | |
1090 | conn->mtu = hcon->hdev->acl_mtu; | |
1091 | ||
1da177e4 LT |
1092 | conn->src = &hcon->hdev->bdaddr; |
1093 | conn->dst = &hcon->dst; | |
1094 | ||
4e8402a3 MH |
1095 | conn->feat_mask = 0; |
1096 | ||
1da177e4 | 1097 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
1098 | rwlock_init(&conn->chan_lock); |
1099 | ||
1100 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1101 | |
5d3de7df VCG |
1102 | if (hcon->type == LE_LINK) |
1103 | setup_timer(&conn->security_timer, security_timeout, | |
1104 | (unsigned long) conn); | |
1105 | else | |
b62f328b | 1106 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
45054dc1 DY |
1107 | (unsigned long) conn); |
1108 | ||
9f5a0d7b | 1109 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1110 | |
1da177e4 LT |
1111 | return conn; |
1112 | } | |
1113 | ||
48454079 | 1114 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 1115 | { |
baa7e1fa | 1116 | write_lock_bh(&conn->chan_lock); |
48454079 | 1117 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 1118 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
1119 | } |
1120 | ||
1da177e4 | 1121 | /* ---- Socket interface ---- */ |
1da177e4 LT |
1122 | |
1123 | /* Find socket with psm and source bdaddr. | |
1124 | * Returns closest match. | |
1125 | */ | |
23691d75 | 1126 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 | 1127 | { |
23691d75 | 1128 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1129 | |
23691d75 | 1130 | read_lock(&chan_list_lock); |
e0f0cb56 | 1131 | |
23691d75 GP |
1132 | list_for_each_entry(c, &chan_list, global_l) { |
1133 | struct sock *sk = c->sk; | |
fe4128e0 | 1134 | |
89bc500e | 1135 | if (state && c->state != state) |
1da177e4 LT |
1136 | continue; |
1137 | ||
23691d75 | 1138 | if (c->psm == psm) { |
1da177e4 | 1139 | /* Exact match. */ |
23691d75 | 1140 | if (!bacmp(&bt_sk(sk)->src, src)) { |
a7567b20 | 1141 | read_unlock(&chan_list_lock); |
23691d75 GP |
1142 | return c; |
1143 | } | |
1da177e4 LT |
1144 | |
1145 | /* Closest match */ | |
1146 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
23691d75 | 1147 | c1 = c; |
1da177e4 LT |
1148 | } |
1149 | } | |
1da177e4 | 1150 | |
23691d75 | 1151 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1152 | |
23691d75 | 1153 | return c1; |
1da177e4 LT |
1154 | } |
1155 | ||
77a74c7e | 1156 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 1157 | { |
5d41ce1d | 1158 | struct sock *sk = chan->sk; |
1da177e4 LT |
1159 | bdaddr_t *src = &bt_sk(sk)->src; |
1160 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
1161 | struct l2cap_conn *conn; | |
1162 | struct hci_conn *hcon; | |
1163 | struct hci_dev *hdev; | |
09ab6f4c | 1164 | __u8 auth_type; |
44d0e48e | 1165 | int err; |
1da177e4 | 1166 | |
f29972de | 1167 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
fe4128e0 | 1168 | chan->psm); |
1da177e4 | 1169 | |
af05b30b GP |
1170 | hdev = hci_get_route(dst, src); |
1171 | if (!hdev) | |
1da177e4 LT |
1172 | return -EHOSTUNREACH; |
1173 | ||
09fd0de5 | 1174 | hci_dev_lock(hdev); |
1da177e4 | 1175 | |
4343478f | 1176 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1177 | |
fe4128e0 | 1178 | if (chan->dcid == L2CAP_CID_LE_DATA) |
acd7d370 | 1179 | hcon = hci_connect(hdev, LE_LINK, dst, |
4343478f | 1180 | chan->sec_level, auth_type); |
acd7d370 VT |
1181 | else |
1182 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 1183 | chan->sec_level, auth_type); |
acd7d370 | 1184 | |
30e76272 VT |
1185 | if (IS_ERR(hcon)) { |
1186 | err = PTR_ERR(hcon); | |
1da177e4 | 1187 | goto done; |
30e76272 | 1188 | } |
1da177e4 LT |
1189 | |
1190 | conn = l2cap_conn_add(hcon, 0); | |
1191 | if (!conn) { | |
1192 | hci_conn_put(hcon); | |
30e76272 | 1193 | err = -ENOMEM; |
1da177e4 LT |
1194 | goto done; |
1195 | } | |
1196 | ||
1da177e4 LT |
1197 | /* Update source addr of the socket */ |
1198 | bacpy(src, conn->src); | |
1199 | ||
48454079 GP |
1200 | l2cap_chan_add(conn, chan); |
1201 | ||
89bc500e | 1202 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1203 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1204 | |
1205 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1206 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1207 | __clear_chan_timer(chan); |
d45fc423 | 1208 | if (l2cap_chan_check_security(chan)) |
89bc500e | 1209 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1210 | } else |
fc7f8a7e | 1211 | l2cap_do_start(chan); |
1da177e4 LT |
1212 | } |
1213 | ||
30e76272 VT |
1214 | err = 0; |
1215 | ||
1da177e4 | 1216 | done: |
09fd0de5 | 1217 | hci_dev_unlock(hdev); |
1da177e4 LT |
1218 | hci_dev_put(hdev); |
1219 | return err; | |
1220 | } | |
1221 | ||
dcba0dba | 1222 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1223 | { |
8c1d787b | 1224 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1225 | DECLARE_WAITQUEUE(wait, current); |
1226 | int err = 0; | |
1227 | int timeo = HZ/5; | |
1228 | ||
2b0b05dd | 1229 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1230 | set_current_state(TASK_INTERRUPTIBLE); |
1231 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1232 | if (!timeo) |
1233 | timeo = HZ/5; | |
1234 | ||
1235 | if (signal_pending(current)) { | |
1236 | err = sock_intr_errno(timeo); | |
1237 | break; | |
1238 | } | |
1239 | ||
1240 | release_sock(sk); | |
1241 | timeo = schedule_timeout(timeo); | |
1242 | lock_sock(sk); | |
a71a0cf4 | 1243 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1244 | |
1245 | err = sock_error(sk); | |
1246 | if (err) | |
1247 | break; | |
1248 | } | |
1249 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1250 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1251 | return err; |
1252 | } | |
1253 | ||
e90bac06 GP |
1254 | static void l2cap_monitor_timeout(unsigned long arg) |
1255 | { | |
525cd185 GP |
1256 | struct l2cap_chan *chan = (void *) arg; |
1257 | struct sock *sk = chan->sk; | |
e90bac06 | 1258 | |
525cd185 | 1259 | BT_DBG("chan %p", chan); |
0e98958d | 1260 | |
e686219a | 1261 | bh_lock_sock(sk); |
2c03a7a4 | 1262 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1263 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
b13f5860 | 1264 | bh_unlock_sock(sk); |
e90bac06 GP |
1265 | return; |
1266 | } | |
1267 | ||
6a026610 | 1268 | chan->retry_count++; |
1a09bcb9 | 1269 | __set_monitor_timer(chan); |
e90bac06 | 1270 | |
525cd185 | 1271 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1272 | bh_unlock_sock(sk); |
e90bac06 GP |
1273 | } |
1274 | ||
1275 | static void l2cap_retrans_timeout(unsigned long arg) | |
1276 | { | |
525cd185 GP |
1277 | struct l2cap_chan *chan = (void *) arg; |
1278 | struct sock *sk = chan->sk; | |
e90bac06 | 1279 | |
49208c9c | 1280 | BT_DBG("chan %p", chan); |
0e98958d | 1281 | |
e686219a | 1282 | bh_lock_sock(sk); |
6a026610 | 1283 | chan->retry_count = 1; |
1a09bcb9 | 1284 | __set_monitor_timer(chan); |
e90bac06 | 1285 | |
e2ab4353 | 1286 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1287 | |
525cd185 | 1288 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 1289 | bh_unlock_sock(sk); |
e90bac06 GP |
1290 | } |
1291 | ||
42e5c802 | 1292 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1293 | { |
1c2acffb | 1294 | struct sk_buff *skb; |
1da177e4 | 1295 | |
58d35f87 | 1296 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1297 | chan->unacked_frames) { |
42e5c802 | 1298 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 1299 | break; |
1da177e4 | 1300 | |
58d35f87 | 1301 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1302 | kfree_skb(skb); |
1da177e4 | 1303 | |
6a026610 | 1304 | chan->unacked_frames--; |
1c2acffb | 1305 | } |
1da177e4 | 1306 | |
6a026610 | 1307 | if (!chan->unacked_frames) |
1a09bcb9 | 1308 | __clear_retrans_timer(chan); |
1c2acffb | 1309 | } |
1da177e4 | 1310 | |
67c9e840 | 1311 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1312 | { |
ccbb84af | 1313 | struct sk_buff *skb; |
88843ab0 AE |
1314 | u32 control; |
1315 | u16 fcs; | |
6840ed07 | 1316 | |
58d35f87 | 1317 | while ((skb = skb_dequeue(&chan->tx_q))) { |
88843ab0 | 1318 | control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1319 | control |= __set_txseq(chan, chan->next_tx_seq); |
88843ab0 | 1320 | __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1321 | |
47d1ec61 | 1322 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1323 | fcs = crc16(0, (u8 *)skb->data, |
1324 | skb->len - L2CAP_FCS_SIZE); | |
1325 | put_unaligned_le16(fcs, | |
1326 | skb->data + skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1327 | } |
1328 | ||
4343478f | 1329 | l2cap_do_send(chan, skb); |
6840ed07 | 1330 | |
836be934 | 1331 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
6840ed07 | 1332 | } |
6840ed07 GP |
1333 | } |
1334 | ||
fb45de7d | 1335 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1336 | { |
8f17154f | 1337 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1338 | u16 fcs; |
1339 | u32 control; | |
8f17154f | 1340 | |
58d35f87 | 1341 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1342 | if (!skb) |
1343 | return; | |
8f17154f | 1344 | |
d1726b6d | 1345 | while (bt_cb(skb)->tx_seq != tx_seq) { |
58d35f87 | 1346 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1347 | return; |
8f17154f | 1348 | |
d1726b6d SJ |
1349 | skb = skb_queue_next(&chan->tx_q, skb); |
1350 | } | |
8f17154f | 1351 | |
2c03a7a4 GP |
1352 | if (chan->remote_max_tx && |
1353 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1354 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1355 | return; |
1356 | } | |
1357 | ||
1358 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1359 | bt_cb(skb)->retries++; | |
88843ab0 AE |
1360 | |
1361 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1362 | control &= __get_sar_mask(chan); |
3cb123d1 | 1363 | |
e2ab4353 | 1364 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1365 | control |= __set_ctrl_final(chan); |
95ffa978 | 1366 | |
0b209fae | 1367 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1368 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1369 | |
88843ab0 | 1370 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1371 | |
47d1ec61 | 1372 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1373 | fcs = crc16(0, (u8 *)tx_skb->data, |
1374 | tx_skb->len - L2CAP_FCS_SIZE); | |
1375 | put_unaligned_le16(fcs, | |
1376 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1377 | } |
1378 | ||
4343478f | 1379 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1380 | } |
1381 | ||
67c9e840 | 1382 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1383 | { |
1384 | struct sk_buff *skb, *tx_skb; | |
88843ab0 AE |
1385 | u16 fcs; |
1386 | u32 control; | |
9a9c6a34 | 1387 | int nsent = 0; |
1c2acffb | 1388 | |
89bc500e | 1389 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1390 | return -ENOTCONN; |
e90bac06 | 1391 | |
58d35f87 | 1392 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1393 | |
2c03a7a4 GP |
1394 | if (chan->remote_max_tx && |
1395 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
8c1d787b | 1396 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1397 | break; |
1398 | } | |
1399 | ||
e420aba3 AE |
1400 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1401 | ||
e90bac06 GP |
1402 | bt_cb(skb)->retries++; |
1403 | ||
88843ab0 | 1404 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1405 | control &= __get_sar_mask(chan); |
95ffa978 | 1406 | |
e2ab4353 | 1407 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1408 | control |= __set_ctrl_final(chan); |
e2ab4353 | 1409 | |
0b209fae | 1410 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1411 | control |= __set_txseq(chan, chan->next_tx_seq); |
1c2acffb | 1412 | |
88843ab0 | 1413 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
e90bac06 | 1414 | |
47d1ec61 | 1415 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1416 | fcs = crc16(0, (u8 *)skb->data, |
1417 | tx_skb->len - L2CAP_FCS_SIZE); | |
1418 | put_unaligned_le16(fcs, skb->data + | |
1419 | tx_skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1420 | } |
1421 | ||
4343478f | 1422 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1423 | |
1a09bcb9 | 1424 | __set_retrans_timer(chan); |
1c2acffb | 1425 | |
42e5c802 | 1426 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
836be934 AE |
1427 | |
1428 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
1c2acffb | 1429 | |
23e9fde2 | 1430 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1431 | chan->unacked_frames++; |
23e9fde2 | 1432 | |
6a026610 | 1433 | chan->frames_sent++; |
1c2acffb | 1434 | |
58d35f87 GP |
1435 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1436 | chan->tx_send_head = NULL; | |
1c2acffb | 1437 | else |
58d35f87 | 1438 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1439 | |
1440 | nsent++; | |
1c2acffb GP |
1441 | } |
1442 | ||
9e917af1 GP |
1443 | return nsent; |
1444 | } | |
1445 | ||
525cd185 | 1446 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1447 | { |
dfc909be GP |
1448 | int ret; |
1449 | ||
58d35f87 GP |
1450 | if (!skb_queue_empty(&chan->tx_q)) |
1451 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1452 | |
42e5c802 | 1453 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1454 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1455 | return ret; |
1456 | } | |
1457 | ||
525cd185 | 1458 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1459 | { |
88843ab0 | 1460 | u32 control = 0; |
9e917af1 | 1461 | |
0b209fae | 1462 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1463 | |
e2ab4353 | 1464 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1465 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1466 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1467 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1468 | return; |
9e917af1 | 1469 | } |
dfc909be | 1470 | |
525cd185 | 1471 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1472 | return; |
1473 | ||
ab784b73 | 1474 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1475 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1476 | } |
1477 | ||
525cd185 | 1478 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1479 | { |
1480 | struct srej_list *tail; | |
88843ab0 | 1481 | u32 control; |
99b0d4b7 | 1482 | |
ab784b73 | 1483 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1484 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1485 | |
39d5a3ee | 1486 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1487 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1488 | |
525cd185 | 1489 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1490 | } |
1491 | ||
1c2acffb GP |
1492 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1493 | { | |
8c1d787b | 1494 | struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; |
1c2acffb GP |
1495 | struct sk_buff **frag; |
1496 | int err, sent = 0; | |
1da177e4 | 1497 | |
59203a21 | 1498 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1499 | return -EFAULT; |
1da177e4 LT |
1500 | |
1501 | sent += count; | |
1502 | len -= count; | |
1503 | ||
1504 | /* Continuation fragments (no L2CAP header) */ | |
1505 | frag = &skb_shinfo(skb)->frag_list; | |
1506 | while (len) { | |
1507 | count = min_t(unsigned int, conn->mtu, len); | |
1508 | ||
1509 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1510 | if (!*frag) | |
0175d629 | 1511 | return err; |
1c2acffb GP |
1512 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1513 | return -EFAULT; | |
1da177e4 | 1514 | |
5e59b791 LAD |
1515 | (*frag)->priority = skb->priority; |
1516 | ||
1da177e4 LT |
1517 | sent += count; |
1518 | len -= count; | |
1519 | ||
1520 | frag = &(*frag)->next; | |
1521 | } | |
1da177e4 LT |
1522 | |
1523 | return sent; | |
1c2acffb | 1524 | } |
1da177e4 | 1525 | |
5e59b791 LAD |
1526 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1527 | struct msghdr *msg, size_t len, | |
1528 | u32 priority) | |
1c2acffb | 1529 | { |
fe4128e0 | 1530 | struct sock *sk = chan->sk; |
8c1d787b | 1531 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1532 | struct sk_buff *skb; |
03a51213 | 1533 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1534 | struct l2cap_hdr *lh; |
1535 | ||
5e59b791 | 1536 | BT_DBG("sk %p len %d priority %u", sk, (int)len, priority); |
1c2acffb GP |
1537 | |
1538 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1539 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1540 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1541 | if (!skb) | |
0175d629 | 1542 | return ERR_PTR(err); |
1c2acffb | 1543 | |
5e59b791 LAD |
1544 | skb->priority = priority; |
1545 | ||
1c2acffb GP |
1546 | /* Create L2CAP header */ |
1547 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1548 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1549 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
fe4128e0 | 1550 | put_unaligned_le16(chan->psm, skb_put(skb, 2)); |
1c2acffb GP |
1551 | |
1552 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1553 | if (unlikely(err < 0)) { | |
1554 | kfree_skb(skb); | |
1555 | return ERR_PTR(err); | |
1556 | } | |
1557 | return skb; | |
1558 | } | |
1559 | ||
5e59b791 LAD |
1560 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1561 | struct msghdr *msg, size_t len, | |
1562 | u32 priority) | |
1c2acffb | 1563 | { |
fe4128e0 | 1564 | struct sock *sk = chan->sk; |
8c1d787b | 1565 | struct l2cap_conn *conn = chan->conn; |
1c2acffb GP |
1566 | struct sk_buff *skb; |
1567 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1568 | struct l2cap_hdr *lh; | |
1569 | ||
1570 | BT_DBG("sk %p len %d", sk, (int)len); | |
1571 | ||
1572 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1573 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1574 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1575 | if (!skb) | |
0175d629 | 1576 | return ERR_PTR(err); |
1c2acffb | 1577 | |
5e59b791 LAD |
1578 | skb->priority = priority; |
1579 | ||
1c2acffb GP |
1580 | /* Create L2CAP header */ |
1581 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1582 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb GP |
1583 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1584 | ||
1585 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1586 | if (unlikely(err < 0)) { | |
1587 | kfree_skb(skb); | |
1588 | return ERR_PTR(err); | |
1589 | } | |
1590 | return skb; | |
1591 | } | |
1592 | ||
ab0ff76d LAD |
1593 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1594 | struct msghdr *msg, size_t len, | |
88843ab0 | 1595 | u32 control, u16 sdulen) |
1c2acffb | 1596 | { |
47d1ec61 | 1597 | struct sock *sk = chan->sk; |
8c1d787b | 1598 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1599 | struct sk_buff *skb; |
e4ca6d98 | 1600 | int err, count, hlen; |
1c2acffb GP |
1601 | struct l2cap_hdr *lh; |
1602 | ||
1603 | BT_DBG("sk %p len %d", sk, (int)len); | |
1604 | ||
0ee0d208 GP |
1605 | if (!conn) |
1606 | return ERR_PTR(-ENOTCONN); | |
1607 | ||
e4ca6d98 AE |
1608 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1609 | hlen = L2CAP_EXT_HDR_SIZE; | |
1610 | else | |
1611 | hlen = L2CAP_ENH_HDR_SIZE; | |
1612 | ||
c74e560c | 1613 | if (sdulen) |
03a51213 | 1614 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1615 | |
47d1ec61 | 1616 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1617 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1618 | |
1c2acffb GP |
1619 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1620 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1621 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1622 | if (!skb) | |
0175d629 | 1623 | return ERR_PTR(err); |
1c2acffb GP |
1624 | |
1625 | /* Create L2CAP header */ | |
1626 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1627 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1628 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 AE |
1629 | |
1630 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
1631 | ||
c74e560c | 1632 | if (sdulen) |
03a51213 | 1633 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb GP |
1634 | |
1635 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1636 | if (unlikely(err < 0)) { | |
1637 | kfree_skb(skb); | |
1638 | return ERR_PTR(err); | |
1639 | } | |
e90bac06 | 1640 | |
47d1ec61 | 1641 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1642 | put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE)); |
fcc203c3 | 1643 | |
e90bac06 | 1644 | bt_cb(skb)->retries = 0; |
1c2acffb | 1645 | return skb; |
1da177e4 LT |
1646 | } |
1647 | ||
67c9e840 | 1648 | static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1649 | { |
c74e560c GP |
1650 | struct sk_buff *skb; |
1651 | struct sk_buff_head sar_queue; | |
88843ab0 | 1652 | u32 control; |
c74e560c GP |
1653 | size_t size = 0; |
1654 | ||
ff12fd64 | 1655 | skb_queue_head_init(&sar_queue); |
7e0ef6ee | 1656 | control = __set_ctrl_sar(chan, L2CAP_SAR_START); |
47d1ec61 | 1657 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1658 | if (IS_ERR(skb)) |
1659 | return PTR_ERR(skb); | |
1660 | ||
1661 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1662 | len -= chan->remote_mps; |
1663 | size += chan->remote_mps; | |
c74e560c GP |
1664 | |
1665 | while (len > 0) { | |
1666 | size_t buflen; | |
1667 | ||
2c03a7a4 | 1668 | if (len > chan->remote_mps) { |
7e0ef6ee | 1669 | control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE); |
2c03a7a4 | 1670 | buflen = chan->remote_mps; |
c74e560c | 1671 | } else { |
7e0ef6ee | 1672 | control = __set_ctrl_sar(chan, L2CAP_SAR_END); |
c74e560c GP |
1673 | buflen = len; |
1674 | } | |
1675 | ||
47d1ec61 | 1676 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1677 | if (IS_ERR(skb)) { |
1678 | skb_queue_purge(&sar_queue); | |
1679 | return PTR_ERR(skb); | |
1680 | } | |
1681 | ||
1682 | __skb_queue_tail(&sar_queue, skb); | |
1683 | len -= buflen; | |
1684 | size += buflen; | |
c74e560c | 1685 | } |
58d35f87 GP |
1686 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1687 | if (chan->tx_send_head == NULL) | |
1688 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1689 | |
1690 | return size; | |
1691 | } | |
1692 | ||
5e59b791 LAD |
1693 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
1694 | u32 priority) | |
9a91a04a | 1695 | { |
9a91a04a | 1696 | struct sk_buff *skb; |
88843ab0 | 1697 | u32 control; |
9a91a04a GP |
1698 | int err; |
1699 | ||
1700 | /* Connectionless channel */ | |
715ec005 | 1701 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 1702 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
1703 | if (IS_ERR(skb)) |
1704 | return PTR_ERR(skb); | |
1705 | ||
1706 | l2cap_do_send(chan, skb); | |
1707 | return len; | |
1708 | } | |
1709 | ||
1710 | switch (chan->mode) { | |
1711 | case L2CAP_MODE_BASIC: | |
1712 | /* Check outgoing MTU */ | |
1713 | if (len > chan->omtu) | |
1714 | return -EMSGSIZE; | |
1715 | ||
1716 | /* Create a basic PDU */ | |
5e59b791 | 1717 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
1718 | if (IS_ERR(skb)) |
1719 | return PTR_ERR(skb); | |
1720 | ||
1721 | l2cap_do_send(chan, skb); | |
1722 | err = len; | |
1723 | break; | |
1724 | ||
1725 | case L2CAP_MODE_ERTM: | |
1726 | case L2CAP_MODE_STREAMING: | |
1727 | /* Entire SDU fits into one PDU */ | |
1728 | if (len <= chan->remote_mps) { | |
7e0ef6ee | 1729 | control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED); |
9a91a04a GP |
1730 | skb = l2cap_create_iframe_pdu(chan, msg, len, control, |
1731 | 0); | |
1732 | if (IS_ERR(skb)) | |
1733 | return PTR_ERR(skb); | |
1734 | ||
1735 | __skb_queue_tail(&chan->tx_q, skb); | |
1736 | ||
1737 | if (chan->tx_send_head == NULL) | |
1738 | chan->tx_send_head = skb; | |
1739 | ||
1740 | } else { | |
1741 | /* Segment SDU into multiples PDUs */ | |
1742 | err = l2cap_sar_segment_sdu(chan, msg, len); | |
1743 | if (err < 0) | |
1744 | return err; | |
1745 | } | |
1746 | ||
1747 | if (chan->mode == L2CAP_MODE_STREAMING) { | |
1748 | l2cap_streaming_send(chan); | |
1749 | err = len; | |
1750 | break; | |
1751 | } | |
1752 | ||
e2ab4353 GP |
1753 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
1754 | test_bit(CONN_WAIT_F, &chan->conn_state)) { | |
9a91a04a GP |
1755 | err = len; |
1756 | break; | |
1757 | } | |
1758 | ||
1759 | err = l2cap_ertm_send(chan); | |
1760 | if (err >= 0) | |
1761 | err = len; | |
1762 | ||
1763 | break; | |
1764 | ||
1765 | default: | |
1766 | BT_DBG("bad state %1.1x", chan->mode); | |
1767 | err = -EBADFD; | |
1768 | } | |
1769 | ||
1770 | return err; | |
1771 | } | |
1772 | ||
1da177e4 LT |
1773 | /* Copy frame to all raw sockets on that connection */ |
1774 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1775 | { | |
1da177e4 | 1776 | struct sk_buff *nskb; |
48454079 | 1777 | struct l2cap_chan *chan; |
1da177e4 LT |
1778 | |
1779 | BT_DBG("conn %p", conn); | |
1780 | ||
baa7e1fa GP |
1781 | read_lock(&conn->chan_lock); |
1782 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1783 | struct sock *sk = chan->sk; |
715ec005 | 1784 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
1785 | continue; |
1786 | ||
1787 | /* Don't send frame to the socket it came from */ | |
1788 | if (skb->sk == sk) | |
1789 | continue; | |
af05b30b GP |
1790 | nskb = skb_clone(skb, GFP_ATOMIC); |
1791 | if (!nskb) | |
1da177e4 LT |
1792 | continue; |
1793 | ||
23070494 | 1794 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
1795 | kfree_skb(nskb); |
1796 | } | |
baa7e1fa | 1797 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1798 | } |
1799 | ||
1800 | /* ---- L2CAP signalling commands ---- */ | |
1801 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1802 | u8 code, u8 ident, u16 dlen, void *data) | |
1803 | { | |
1804 | struct sk_buff *skb, **frag; | |
1805 | struct l2cap_cmd_hdr *cmd; | |
1806 | struct l2cap_hdr *lh; | |
1807 | int len, count; | |
1808 | ||
af05b30b GP |
1809 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1810 | conn, code, ident, dlen); | |
1da177e4 LT |
1811 | |
1812 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1813 | count = min_t(unsigned int, conn->mtu, len); | |
1814 | ||
1815 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1816 | if (!skb) | |
1817 | return NULL; | |
1818 | ||
1819 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1820 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1821 | |
1822 | if (conn->hcon->type == LE_LINK) | |
1823 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1824 | else | |
1825 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1826 | |
1827 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1828 | cmd->code = code; | |
1829 | cmd->ident = ident; | |
aca3192c | 1830 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1831 | |
1832 | if (dlen) { | |
1833 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1834 | memcpy(skb_put(skb, count), data, count); | |
1835 | data += count; | |
1836 | } | |
1837 | ||
1838 | len -= skb->len; | |
1839 | ||
1840 | /* Continuation fragments (no L2CAP header) */ | |
1841 | frag = &skb_shinfo(skb)->frag_list; | |
1842 | while (len) { | |
1843 | count = min_t(unsigned int, conn->mtu, len); | |
1844 | ||
1845 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1846 | if (!*frag) | |
1847 | goto fail; | |
1848 | ||
1849 | memcpy(skb_put(*frag, count), data, count); | |
1850 | ||
1851 | len -= count; | |
1852 | data += count; | |
1853 | ||
1854 | frag = &(*frag)->next; | |
1855 | } | |
1856 | ||
1857 | return skb; | |
1858 | ||
1859 | fail: | |
1860 | kfree_skb(skb); | |
1861 | return NULL; | |
1862 | } | |
1863 | ||
1864 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1865 | { | |
1866 | struct l2cap_conf_opt *opt = *ptr; | |
1867 | int len; | |
1868 | ||
1869 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1870 | *ptr += len; | |
1871 | ||
1872 | *type = opt->type; | |
1873 | *olen = opt->len; | |
1874 | ||
1875 | switch (opt->len) { | |
1876 | case 1: | |
1877 | *val = *((u8 *) opt->val); | |
1878 | break; | |
1879 | ||
1880 | case 2: | |
bfaaeb3e | 1881 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1882 | break; |
1883 | ||
1884 | case 4: | |
bfaaeb3e | 1885 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1886 | break; |
1887 | ||
1888 | default: | |
1889 | *val = (unsigned long) opt->val; | |
1890 | break; | |
1891 | } | |
1892 | ||
1893 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1894 | return len; | |
1895 | } | |
1896 | ||
1da177e4 LT |
1897 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1898 | { | |
1899 | struct l2cap_conf_opt *opt = *ptr; | |
1900 | ||
1901 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1902 | ||
1903 | opt->type = type; | |
1904 | opt->len = len; | |
1905 | ||
1906 | switch (len) { | |
1907 | case 1: | |
1908 | *((u8 *) opt->val) = val; | |
1909 | break; | |
1910 | ||
1911 | case 2: | |
4f8b691c | 1912 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1913 | break; |
1914 | ||
1915 | case 4: | |
4f8b691c | 1916 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1917 | break; |
1918 | ||
1919 | default: | |
1920 | memcpy(opt->val, (void *) val, len); | |
1921 | break; | |
1922 | } | |
1923 | ||
1924 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1925 | } | |
1926 | ||
f89cef09 AE |
1927 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
1928 | { | |
1929 | struct l2cap_conf_efs efs; | |
1930 | ||
1ec918ce | 1931 | switch (chan->mode) { |
f89cef09 AE |
1932 | case L2CAP_MODE_ERTM: |
1933 | efs.id = chan->local_id; | |
1934 | efs.stype = chan->local_stype; | |
1935 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1936 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1937 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
1938 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
1939 | break; | |
1940 | ||
1941 | case L2CAP_MODE_STREAMING: | |
1942 | efs.id = 1; | |
1943 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
1944 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
1945 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
1946 | efs.acc_lat = 0; | |
1947 | efs.flush_to = 0; | |
1948 | break; | |
1949 | ||
1950 | default: | |
1951 | return; | |
1952 | } | |
1953 | ||
1954 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
1955 | (unsigned long) &efs); | |
1956 | } | |
1957 | ||
c1b4f43b GP |
1958 | static void l2cap_ack_timeout(unsigned long arg) |
1959 | { | |
525cd185 | 1960 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1961 | |
525cd185 GP |
1962 | bh_lock_sock(chan->sk); |
1963 | l2cap_send_ack(chan); | |
1964 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1965 | } |
1966 | ||
525cd185 | 1967 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1968 | { |
525cd185 GP |
1969 | struct sock *sk = chan->sk; |
1970 | ||
42e5c802 | 1971 | chan->expected_ack_seq = 0; |
6a026610 | 1972 | chan->unacked_frames = 0; |
42e5c802 | 1973 | chan->buffer_seq = 0; |
6a026610 GP |
1974 | chan->num_acked = 0; |
1975 | chan->frames_sent = 0; | |
0565c1c2 | 1976 | |
e92c8e70 GP |
1977 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1978 | (unsigned long) chan); | |
1979 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1980 | (unsigned long) chan); | |
1981 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1982 | |
f1c6775b | 1983 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 1984 | |
39d5a3ee GP |
1985 | INIT_LIST_HEAD(&chan->srej_l); |
1986 | ||
218bb9df GP |
1987 | |
1988 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1989 | } |
1990 | ||
f2fcfcd6 GP |
1991 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1992 | { | |
1993 | switch (mode) { | |
1994 | case L2CAP_MODE_STREAMING: | |
1995 | case L2CAP_MODE_ERTM: | |
1996 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1997 | return mode; | |
1998 | /* fall through */ | |
1999 | default: | |
2000 | return L2CAP_MODE_BASIC; | |
2001 | } | |
2002 | } | |
2003 | ||
6327eb98 AE |
2004 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2005 | { | |
2006 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2007 | } | |
2008 | ||
f89cef09 AE |
2009 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2010 | { | |
2011 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2012 | } | |
2013 | ||
6327eb98 AE |
2014 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2015 | { | |
2016 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2017 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2018 | /* use extended control field */ |
2019 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2020 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2021 | } else { | |
6327eb98 AE |
2022 | chan->tx_win = min_t(u16, chan->tx_win, |
2023 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2024 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2025 | } | |
6327eb98 AE |
2026 | } |
2027 | ||
710f9b0a | 2028 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2029 | { |
1da177e4 | 2030 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2031 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2032 | void *ptr = req->data; |
c8f79162 | 2033 | u16 size; |
1da177e4 | 2034 | |
49208c9c | 2035 | BT_DBG("chan %p", chan); |
1da177e4 | 2036 | |
73ffa904 | 2037 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2038 | goto done; |
2039 | ||
0c1bc5c6 | 2040 | switch (chan->mode) { |
f2fcfcd6 GP |
2041 | case L2CAP_MODE_STREAMING: |
2042 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2043 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2044 | break; |
85eb53c6 | 2045 | |
f89cef09 AE |
2046 | if (__l2cap_efs_supported(chan)) |
2047 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2048 | ||
2ba13ed6 | 2049 | /* fall through */ |
f2fcfcd6 | 2050 | default: |
8c1d787b | 2051 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2052 | break; |
2053 | } | |
2054 | ||
2055 | done: | |
0c1bc5c6 GP |
2056 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2057 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2058 | |
0c1bc5c6 | 2059 | switch (chan->mode) { |
65c7c491 | 2060 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2061 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2062 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2063 | break; |
2064 | ||
62547752 GP |
2065 | rfc.mode = L2CAP_MODE_BASIC; |
2066 | rfc.txwin_size = 0; | |
2067 | rfc.max_transmit = 0; | |
2068 | rfc.retrans_timeout = 0; | |
2069 | rfc.monitor_timeout = 0; | |
2070 | rfc.max_pdu_size = 0; | |
2071 | ||
63406504 GP |
2072 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2073 | (unsigned long) &rfc); | |
65c7c491 MH |
2074 | break; |
2075 | ||
2076 | case L2CAP_MODE_ERTM: | |
2077 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2078 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2079 | rfc.retrans_timeout = 0; |
2080 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2081 | |
2082 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2083 | L2CAP_EXT_HDR_SIZE - | |
2084 | L2CAP_SDULEN_SIZE - | |
2085 | L2CAP_FCS_SIZE); | |
2086 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2087 | |
6327eb98 AE |
2088 | l2cap_txwin_setup(chan); |
2089 | ||
2090 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2091 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2092 | |
63406504 GP |
2093 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2094 | (unsigned long) &rfc); | |
2095 | ||
f89cef09 AE |
2096 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2097 | l2cap_add_opt_efs(&ptr, chan); | |
2098 | ||
8c1d787b | 2099 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2100 | break; |
2101 | ||
47d1ec61 | 2102 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2103 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2104 | chan->fcs = L2CAP_FCS_NONE; |
2105 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2106 | } |
6327eb98 AE |
2107 | |
2108 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2109 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2110 | chan->tx_win); | |
f2fcfcd6 GP |
2111 | break; |
2112 | ||
2113 | case L2CAP_MODE_STREAMING: | |
2114 | rfc.mode = L2CAP_MODE_STREAMING; | |
2115 | rfc.txwin_size = 0; | |
2116 | rfc.max_transmit = 0; | |
2117 | rfc.retrans_timeout = 0; | |
2118 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2119 | |
2120 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2121 | L2CAP_EXT_HDR_SIZE - | |
2122 | L2CAP_SDULEN_SIZE - | |
2123 | L2CAP_FCS_SIZE); | |
2124 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2125 | |
63406504 GP |
2126 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2127 | (unsigned long) &rfc); | |
2128 | ||
f89cef09 AE |
2129 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2130 | l2cap_add_opt_efs(&ptr, chan); | |
2131 | ||
8c1d787b | 2132 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2133 | break; |
2134 | ||
47d1ec61 | 2135 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2136 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2137 | chan->fcs = L2CAP_FCS_NONE; |
2138 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2139 | } |
65c7c491 MH |
2140 | break; |
2141 | } | |
1da177e4 | 2142 | |
fe4128e0 | 2143 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2144 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2145 | |
2146 | return ptr - data; | |
2147 | } | |
2148 | ||
73ffa904 | 2149 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2150 | { |
5dee9e7c MH |
2151 | struct l2cap_conf_rsp *rsp = data; |
2152 | void *ptr = rsp->data; | |
73ffa904 GP |
2153 | void *req = chan->conf_req; |
2154 | int len = chan->conf_len; | |
5dee9e7c MH |
2155 | int type, hint, olen; |
2156 | unsigned long val; | |
6464f35f | 2157 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2158 | struct l2cap_conf_efs efs; |
2159 | u8 remote_efs = 0; | |
861d6882 | 2160 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2161 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2162 | u16 size; |
1da177e4 | 2163 | |
73ffa904 | 2164 | BT_DBG("chan %p", chan); |
820ae1b8 | 2165 | |
5dee9e7c MH |
2166 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2167 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2168 | |
589d2746 | 2169 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2170 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2171 | |
2172 | switch (type) { | |
2173 | case L2CAP_CONF_MTU: | |
861d6882 | 2174 | mtu = val; |
5dee9e7c MH |
2175 | break; |
2176 | ||
2177 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2178 | chan->flush_to = val; |
5dee9e7c MH |
2179 | break; |
2180 | ||
2181 | case L2CAP_CONF_QOS: | |
2182 | break; | |
2183 | ||
6464f35f MH |
2184 | case L2CAP_CONF_RFC: |
2185 | if (olen == sizeof(rfc)) | |
2186 | memcpy(&rfc, (void *) val, olen); | |
2187 | break; | |
2188 | ||
fcc203c3 GP |
2189 | case L2CAP_CONF_FCS: |
2190 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2191 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2192 | break; |
fcc203c3 | 2193 | |
42dceae2 AE |
2194 | case L2CAP_CONF_EFS: |
2195 | remote_efs = 1; | |
2196 | if (olen == sizeof(efs)) | |
2197 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2198 | break; |
2199 | ||
6327eb98 AE |
2200 | case L2CAP_CONF_EWS: |
2201 | if (!enable_hs) | |
2202 | return -ECONNREFUSED; | |
fcc203c3 | 2203 | |
6327eb98 AE |
2204 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2205 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2206 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2207 | chan->remote_tx_win = val; |
fcc203c3 GP |
2208 | break; |
2209 | ||
5dee9e7c MH |
2210 | default: |
2211 | if (hint) | |
2212 | break; | |
2213 | ||
2214 | result = L2CAP_CONF_UNKNOWN; | |
2215 | *((u8 *) ptr++) = type; | |
2216 | break; | |
2217 | } | |
2218 | } | |
2219 | ||
73ffa904 | 2220 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2221 | goto done; |
2222 | ||
0c1bc5c6 | 2223 | switch (chan->mode) { |
f2fcfcd6 GP |
2224 | case L2CAP_MODE_STREAMING: |
2225 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2226 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2227 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2228 | chan->conn->feat_mask); |
85eb53c6 GP |
2229 | break; |
2230 | } | |
2231 | ||
42dceae2 AE |
2232 | if (remote_efs) { |
2233 | if (__l2cap_efs_supported(chan)) | |
2234 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2235 | else | |
2236 | return -ECONNREFUSED; | |
2237 | } | |
2238 | ||
0c1bc5c6 | 2239 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2240 | return -ECONNREFUSED; |
742e519b | 2241 | |
f2fcfcd6 | 2242 | break; |
f2fcfcd6 GP |
2243 | } |
2244 | ||
2245 | done: | |
0c1bc5c6 | 2246 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2247 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2248 | rfc.mode = chan->mode; |
f2fcfcd6 | 2249 | |
73ffa904 | 2250 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2251 | return -ECONNREFUSED; |
2252 | ||
2253 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2254 | sizeof(rfc), (unsigned long) &rfc); | |
2255 | } | |
2256 | ||
5dee9e7c MH |
2257 | if (result == L2CAP_CONF_SUCCESS) { |
2258 | /* Configure output options and let the other side know | |
2259 | * which ones we don't like. */ | |
2260 | ||
f2fcfcd6 GP |
2261 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2262 | result = L2CAP_CONF_UNACCEPT; | |
2263 | else { | |
0c1bc5c6 | 2264 | chan->omtu = mtu; |
c1360a1c | 2265 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2266 | } |
0c1bc5c6 | 2267 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2268 | |
42dceae2 AE |
2269 | if (remote_efs) { |
2270 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2271 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2272 | efs.stype != chan->local_stype) { | |
2273 | ||
2274 | result = L2CAP_CONF_UNACCEPT; | |
2275 | ||
2276 | if (chan->num_conf_req >= 1) | |
2277 | return -ECONNREFUSED; | |
2278 | ||
2279 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2280 | sizeof(efs), |
42dceae2 | 2281 | (unsigned long) &efs); |
0e8b207e | 2282 | } else { |
3e6b3b95 | 2283 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2284 | result = L2CAP_CONF_PENDING; |
2285 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2286 | } |
2287 | } | |
2288 | ||
f2fcfcd6 GP |
2289 | switch (rfc.mode) { |
2290 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2291 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2292 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2293 | break; |
2294 | ||
2295 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2296 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2297 | chan->remote_tx_win = rfc.txwin_size; | |
2298 | else | |
2299 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2300 | |
2c03a7a4 | 2301 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2302 | |
c8f79162 AE |
2303 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2304 | chan->conn->mtu - | |
2305 | L2CAP_EXT_HDR_SIZE - | |
2306 | L2CAP_SDULEN_SIZE - | |
2307 | L2CAP_FCS_SIZE); | |
2308 | rfc.max_pdu_size = cpu_to_le16(size); | |
2309 | chan->remote_mps = size; | |
f2fcfcd6 | 2310 | |
10467e9e GP |
2311 | rfc.retrans_timeout = |
2312 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2313 | rfc.monitor_timeout = | |
2314 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 2315 | |
c1360a1c | 2316 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2317 | |
2318 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2319 | sizeof(rfc), (unsigned long) &rfc); | |
2320 | ||
42dceae2 AE |
2321 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2322 | chan->remote_id = efs.id; | |
2323 | chan->remote_stype = efs.stype; | |
2324 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2325 | chan->remote_flush_to = | |
2326 | le32_to_cpu(efs.flush_to); | |
2327 | chan->remote_acc_lat = | |
2328 | le32_to_cpu(efs.acc_lat); | |
2329 | chan->remote_sdu_itime = | |
2330 | le32_to_cpu(efs.sdu_itime); | |
2331 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2332 | sizeof(efs), (unsigned long) &efs); | |
2333 | } | |
f2fcfcd6 GP |
2334 | break; |
2335 | ||
2336 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2337 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2338 | chan->conn->mtu - | |
2339 | L2CAP_EXT_HDR_SIZE - | |
2340 | L2CAP_SDULEN_SIZE - | |
2341 | L2CAP_FCS_SIZE); | |
2342 | rfc.max_pdu_size = cpu_to_le16(size); | |
2343 | chan->remote_mps = size; | |
f2fcfcd6 | 2344 | |
c1360a1c | 2345 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2346 | |
2347 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2348 | sizeof(rfc), (unsigned long) &rfc); | |
2349 | ||
f2fcfcd6 GP |
2350 | break; |
2351 | ||
2352 | default: | |
5dee9e7c | 2353 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2354 | |
6464f35f | 2355 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2356 | rfc.mode = chan->mode; |
f2fcfcd6 | 2357 | } |
6464f35f | 2358 | |
f2fcfcd6 | 2359 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2360 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2361 | } |
fe4128e0 | 2362 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2363 | rsp->result = cpu_to_le16(result); |
2364 | rsp->flags = cpu_to_le16(0x0000); | |
2365 | ||
2366 | return ptr - data; | |
1da177e4 LT |
2367 | } |
2368 | ||
b4450035 | 2369 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2370 | { |
f2fcfcd6 GP |
2371 | struct l2cap_conf_req *req = data; |
2372 | void *ptr = req->data; | |
2373 | int type, olen; | |
2374 | unsigned long val; | |
2375 | struct l2cap_conf_rfc rfc; | |
66af7aaf | 2376 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 2377 | |
fe4128e0 | 2378 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2379 | |
2380 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2381 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2382 | ||
2383 | switch (type) { | |
2384 | case L2CAP_CONF_MTU: | |
2385 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2386 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2387 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2388 | } else |
0c1bc5c6 GP |
2389 | chan->imtu = val; |
2390 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2391 | break; |
2392 | ||
2393 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2394 | chan->flush_to = val; |
f2fcfcd6 | 2395 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2396 | 2, chan->flush_to); |
f2fcfcd6 GP |
2397 | break; |
2398 | ||
2399 | case L2CAP_CONF_RFC: | |
2400 | if (olen == sizeof(rfc)) | |
2401 | memcpy(&rfc, (void *)val, olen); | |
2402 | ||
c1360a1c | 2403 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2404 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2405 | return -ECONNREFUSED; |
2406 | ||
47d1ec61 | 2407 | chan->fcs = 0; |
f2fcfcd6 GP |
2408 | |
2409 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2410 | sizeof(rfc), (unsigned long) &rfc); | |
2411 | break; | |
6327eb98 AE |
2412 | |
2413 | case L2CAP_CONF_EWS: | |
2414 | chan->tx_win = min_t(u16, val, | |
2415 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
2416 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
2417 | chan->tx_win); | |
6327eb98 | 2418 | break; |
66af7aaf AE |
2419 | |
2420 | case L2CAP_CONF_EFS: | |
2421 | if (olen == sizeof(efs)) | |
2422 | memcpy(&efs, (void *)val, olen); | |
2423 | ||
2424 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2425 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2426 | efs.stype != chan->local_stype) | |
2427 | return -ECONNREFUSED; | |
2428 | ||
2429 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2430 | sizeof(efs), (unsigned long) &efs); | |
2431 | break; | |
f2fcfcd6 GP |
2432 | } |
2433 | } | |
2434 | ||
0c1bc5c6 | 2435 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2436 | return -ECONNREFUSED; |
2437 | ||
0c1bc5c6 | 2438 | chan->mode = rfc.mode; |
6c2ea7a8 | 2439 | |
0e8b207e | 2440 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
2441 | switch (rfc.mode) { |
2442 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2443 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2444 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2445 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
2446 | |
2447 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
2448 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
2449 | chan->local_sdu_itime = | |
2450 | le32_to_cpu(efs.sdu_itime); | |
2451 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
2452 | chan->local_flush_to = | |
2453 | le32_to_cpu(efs.flush_to); | |
2454 | } | |
f2fcfcd6 | 2455 | break; |
66af7aaf | 2456 | |
f2fcfcd6 | 2457 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 2458 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2459 | } |
2460 | } | |
2461 | ||
fe4128e0 | 2462 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2463 | req->flags = cpu_to_le16(0x0000); |
2464 | ||
2465 | return ptr - data; | |
2466 | } | |
2467 | ||
fe4128e0 | 2468 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2469 | { |
2470 | struct l2cap_conf_rsp *rsp = data; | |
2471 | void *ptr = rsp->data; | |
1da177e4 | 2472 | |
fe4128e0 | 2473 | BT_DBG("chan %p", chan); |
1da177e4 | 2474 | |
fe4128e0 | 2475 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2476 | rsp->result = cpu_to_le16(result); |
aca3192c | 2477 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2478 | |
2479 | return ptr - data; | |
2480 | } | |
2481 | ||
8c1d787b | 2482 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2483 | { |
2484 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2485 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2486 | u8 buf[128]; |
2487 | ||
fe4128e0 GP |
2488 | rsp.scid = cpu_to_le16(chan->dcid); |
2489 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2490 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2491 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2492 | l2cap_send_cmd(conn, chan->ident, | |
2493 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2494 | ||
c1360a1c | 2495 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2496 | return; |
2497 | ||
710f9b0a GP |
2498 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2499 | l2cap_build_conf_req(chan, buf), buf); | |
2500 | chan->num_conf_req++; | |
2501 | } | |
2502 | ||
47d1ec61 | 2503 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2504 | { |
7b1c0049 GP |
2505 | int type, olen; |
2506 | unsigned long val; | |
2507 | struct l2cap_conf_rfc rfc; | |
2508 | ||
47d1ec61 | 2509 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2510 | |
0c1bc5c6 | 2511 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2512 | return; |
2513 | ||
2514 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2515 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2516 | ||
2517 | switch (type) { | |
2518 | case L2CAP_CONF_RFC: | |
2519 | if (olen == sizeof(rfc)) | |
2520 | memcpy(&rfc, (void *)val, olen); | |
2521 | goto done; | |
2522 | } | |
2523 | } | |
2524 | ||
2525 | done: | |
2526 | switch (rfc.mode) { | |
2527 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2528 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2529 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2530 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2531 | break; |
2532 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2533 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2534 | } |
2535 | } | |
2536 | ||
4e8402a3 MH |
2537 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2538 | { | |
e2fd318e | 2539 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2540 | |
e2fd318e | 2541 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2542 | return 0; |
2543 | ||
2544 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2545 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2546 | del_timer(&conn->info_timer); |
984947dc MH |
2547 | |
2548 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2549 | conn->info_ident = 0; |
984947dc | 2550 | |
4e8402a3 MH |
2551 | l2cap_conn_start(conn); |
2552 | } | |
2553 | ||
2554 | return 0; | |
2555 | } | |
2556 | ||
1da177e4 LT |
2557 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2558 | { | |
1da177e4 LT |
2559 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2560 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2561 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2562 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2563 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2564 | |
2565 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2566 | __le16 psm = req->psm; |
1da177e4 LT |
2567 | |
2568 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2569 | ||
2570 | /* Check if we have socket listening on psm */ | |
23691d75 GP |
2571 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src); |
2572 | if (!pchan) { | |
1da177e4 LT |
2573 | result = L2CAP_CR_BAD_PSM; |
2574 | goto sendresp; | |
2575 | } | |
2576 | ||
23691d75 GP |
2577 | parent = pchan->sk; |
2578 | ||
e0f0cb56 GP |
2579 | bh_lock_sock(parent); |
2580 | ||
e7c29cb1 MH |
2581 | /* Check if the ACL is secure enough (if not SDP) */ |
2582 | if (psm != cpu_to_le16(0x0001) && | |
2583 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 2584 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
2585 | result = L2CAP_CR_SEC_BLOCK; |
2586 | goto response; | |
2587 | } | |
2588 | ||
1da177e4 LT |
2589 | result = L2CAP_CR_NO_MEM; |
2590 | ||
2591 | /* Check for backlog size */ | |
2592 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2593 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2594 | goto response; |
2595 | } | |
2596 | ||
80808e43 GP |
2597 | chan = pchan->ops->new_connection(pchan->data); |
2598 | if (!chan) | |
1da177e4 LT |
2599 | goto response; |
2600 | ||
80808e43 GP |
2601 | sk = chan->sk; |
2602 | ||
baa7e1fa | 2603 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2604 | |
2605 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2606 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2607 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 | 2608 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 2609 | chan->ops->close(chan->data); |
1da177e4 LT |
2610 | goto response; |
2611 | } | |
2612 | ||
2613 | hci_conn_hold(conn->hcon); | |
2614 | ||
1da177e4 LT |
2615 | bacpy(&bt_sk(sk)->src, conn->src); |
2616 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
2617 | chan->psm = psm; |
2618 | chan->dcid = scid; | |
1da177e4 | 2619 | |
d1010240 GP |
2620 | bt_accept_enqueue(parent, sk); |
2621 | ||
48454079 GP |
2622 | __l2cap_chan_add(conn, chan); |
2623 | ||
fe4128e0 | 2624 | dcid = chan->scid; |
1da177e4 | 2625 | |
c9b66675 | 2626 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 2627 | |
fc7f8a7e | 2628 | chan->ident = cmd->ident; |
1da177e4 | 2629 | |
984947dc | 2630 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 2631 | if (l2cap_chan_check_security(chan)) { |
f66dc81f | 2632 | if (bt_sk(sk)->defer_setup) { |
89bc500e | 2633 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
2634 | result = L2CAP_CR_PEND; |
2635 | status = L2CAP_CS_AUTHOR_PEND; | |
2636 | parent->sk_data_ready(parent, 0); | |
2637 | } else { | |
89bc500e | 2638 | l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
2639 | result = L2CAP_CR_SUCCESS; |
2640 | status = L2CAP_CS_NO_INFO; | |
2641 | } | |
79d554a6 | 2642 | } else { |
89bc500e | 2643 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2644 | result = L2CAP_CR_PEND; |
2645 | status = L2CAP_CS_AUTHEN_PEND; | |
2646 | } | |
2647 | } else { | |
89bc500e | 2648 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
2649 | result = L2CAP_CR_PEND; |
2650 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2651 | } |
2652 | ||
baa7e1fa | 2653 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2654 | |
2655 | response: | |
2656 | bh_unlock_sock(parent); | |
2657 | ||
2658 | sendresp: | |
aca3192c YH |
2659 | rsp.scid = cpu_to_le16(scid); |
2660 | rsp.dcid = cpu_to_le16(dcid); | |
2661 | rsp.result = cpu_to_le16(result); | |
2662 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2663 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2664 | |
2665 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2666 | struct l2cap_info_req info; | |
2667 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2668 | ||
2669 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2670 | conn->info_ident = l2cap_get_ident(conn); | |
2671 | ||
2672 | mod_timer(&conn->info_timer, jiffies + | |
2673 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2674 | ||
2675 | l2cap_send_cmd(conn, conn->info_ident, | |
2676 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2677 | } | |
2678 | ||
c1360a1c | 2679 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
2680 | result == L2CAP_CR_SUCCESS) { |
2681 | u8 buf[128]; | |
c1360a1c | 2682 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 2683 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2684 | l2cap_build_conf_req(chan, buf), buf); |
2685 | chan->num_conf_req++; | |
e9aeb2dd GP |
2686 | } |
2687 | ||
1da177e4 LT |
2688 | return 0; |
2689 | } | |
2690 | ||
2691 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2692 | { | |
2693 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2694 | u16 scid, dcid, result, status; | |
48454079 | 2695 | struct l2cap_chan *chan; |
1da177e4 LT |
2696 | struct sock *sk; |
2697 | u8 req[128]; | |
2698 | ||
2699 | scid = __le16_to_cpu(rsp->scid); | |
2700 | dcid = __le16_to_cpu(rsp->dcid); | |
2701 | result = __le16_to_cpu(rsp->result); | |
2702 | status = __le16_to_cpu(rsp->status); | |
2703 | ||
2704 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2705 | ||
2706 | if (scid) { | |
baa7e1fa | 2707 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2708 | if (!chan) |
57d3b22b | 2709 | return -EFAULT; |
1da177e4 | 2710 | } else { |
baa7e1fa | 2711 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2712 | if (!chan) |
57d3b22b | 2713 | return -EFAULT; |
1da177e4 LT |
2714 | } |
2715 | ||
48454079 GP |
2716 | sk = chan->sk; |
2717 | ||
1da177e4 LT |
2718 | switch (result) { |
2719 | case L2CAP_CR_SUCCESS: | |
89bc500e | 2720 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 2721 | chan->ident = 0; |
fe4128e0 | 2722 | chan->dcid = dcid; |
c1360a1c | 2723 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 2724 | |
c1360a1c | 2725 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
2726 | break; |
2727 | ||
1da177e4 | 2728 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2729 | l2cap_build_conf_req(chan, req), req); |
2730 | chan->num_conf_req++; | |
1da177e4 LT |
2731 | break; |
2732 | ||
2733 | case L2CAP_CR_PEND: | |
c1360a1c | 2734 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
2735 | break; |
2736 | ||
2737 | default: | |
a49184c2 AE |
2738 | /* don't delete l2cap channel if sk is owned by user */ |
2739 | if (sock_owned_by_user(sk)) { | |
89bc500e | 2740 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 2741 | __clear_chan_timer(chan); |
f3f668b0 | 2742 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
a49184c2 AE |
2743 | break; |
2744 | } | |
2745 | ||
48454079 | 2746 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2747 | break; |
2748 | } | |
2749 | ||
2750 | bh_unlock_sock(sk); | |
2751 | return 0; | |
2752 | } | |
2753 | ||
47d1ec61 | 2754 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
2755 | { |
2756 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2757 | * sides request it. | |
2758 | */ | |
0c1bc5c6 | 2759 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2760 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2761 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 2762 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2763 | } |
2764 | ||
88219a0f | 2765 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2766 | { |
2767 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2768 | u16 dcid, flags; | |
2769 | u8 rsp[64]; | |
48454079 | 2770 | struct l2cap_chan *chan; |
1da177e4 | 2771 | struct sock *sk; |
5dee9e7c | 2772 | int len; |
1da177e4 LT |
2773 | |
2774 | dcid = __le16_to_cpu(req->dcid); | |
2775 | flags = __le16_to_cpu(req->flags); | |
2776 | ||
2777 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2778 | ||
baa7e1fa | 2779 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2780 | if (!chan) |
1da177e4 LT |
2781 | return -ENOENT; |
2782 | ||
48454079 GP |
2783 | sk = chan->sk; |
2784 | ||
033b1142 | 2785 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
2786 | struct l2cap_cmd_rej_cid rej; |
2787 | ||
2788 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
2789 | rej.scid = cpu_to_le16(chan->scid); | |
2790 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 2791 | |
df6bd743 GP |
2792 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2793 | sizeof(rej), &rej); | |
354f60a9 | 2794 | goto unlock; |
df6bd743 | 2795 | } |
354f60a9 | 2796 | |
5dee9e7c | 2797 | /* Reject if config buffer is too small. */ |
88219a0f | 2798 | len = cmd_len - sizeof(*req); |
7ac28817 | 2799 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 2800 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 2801 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
2802 | L2CAP_CONF_REJECT, flags), rsp); |
2803 | goto unlock; | |
2804 | } | |
2805 | ||
2806 | /* Store config. */ | |
73ffa904 GP |
2807 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2808 | chan->conf_len += len; | |
1da177e4 LT |
2809 | |
2810 | if (flags & 0x0001) { | |
2811 | /* Incomplete config. Send empty response. */ | |
2812 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 2813 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 2814 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
2815 | goto unlock; |
2816 | } | |
2817 | ||
2818 | /* Complete config. */ | |
73ffa904 | 2819 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2820 | if (len < 0) { |
e92c8e70 | 2821 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2822 | goto unlock; |
f2fcfcd6 | 2823 | } |
1da177e4 | 2824 | |
5dee9e7c | 2825 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2826 | chan->num_conf_rsp++; |
5dee9e7c | 2827 | |
5dee9e7c | 2828 | /* Reset config buffer. */ |
73ffa904 | 2829 | chan->conf_len = 0; |
5dee9e7c | 2830 | |
c1360a1c | 2831 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
2832 | goto unlock; |
2833 | ||
c1360a1c | 2834 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2835 | set_default_fcs(chan); |
fcc203c3 | 2836 | |
89bc500e | 2837 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 2838 | |
42e5c802 GP |
2839 | chan->next_tx_seq = 0; |
2840 | chan->expected_tx_seq = 0; | |
58d35f87 | 2841 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2842 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2843 | l2cap_ertm_init(chan); |
0565c1c2 | 2844 | |
1da177e4 | 2845 | l2cap_chan_ready(sk); |
876d9484 MH |
2846 | goto unlock; |
2847 | } | |
2848 | ||
c1360a1c | 2849 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 2850 | u8 buf[64]; |
1da177e4 | 2851 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2852 | l2cap_build_conf_req(chan, buf), buf); |
2853 | chan->num_conf_req++; | |
1da177e4 LT |
2854 | } |
2855 | ||
0e8b207e AE |
2856 | /* Got Conf Rsp PENDING from remote side and asume we sent |
2857 | Conf Rsp PENDING in the code above */ | |
2858 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
2859 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2860 | ||
2861 | /* check compatibility */ | |
2862 | ||
2863 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2864 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2865 | ||
2866 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2867 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
2868 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
2869 | } | |
2870 | ||
1da177e4 LT |
2871 | unlock: |
2872 | bh_unlock_sock(sk); | |
2873 | return 0; | |
2874 | } | |
2875 | ||
2876 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2877 | { | |
2878 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2879 | u16 scid, flags, result; | |
48454079 | 2880 | struct l2cap_chan *chan; |
1da177e4 | 2881 | struct sock *sk; |
7b1c0049 | 2882 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2883 | |
2884 | scid = __le16_to_cpu(rsp->scid); | |
2885 | flags = __le16_to_cpu(rsp->flags); | |
2886 | result = __le16_to_cpu(rsp->result); | |
2887 | ||
af05b30b GP |
2888 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2889 | scid, flags, result); | |
1da177e4 | 2890 | |
baa7e1fa | 2891 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2892 | if (!chan) |
1da177e4 LT |
2893 | return 0; |
2894 | ||
48454079 GP |
2895 | sk = chan->sk; |
2896 | ||
1da177e4 LT |
2897 | switch (result) { |
2898 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2899 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 2900 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
2901 | break; |
2902 | ||
0e8b207e AE |
2903 | case L2CAP_CONF_PENDING: |
2904 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
2905 | ||
2906 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
2907 | char buf[64]; | |
2908 | ||
2909 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2910 | buf, &result); | |
2911 | if (len < 0) { | |
2912 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
2913 | goto done; | |
2914 | } | |
2915 | ||
2916 | /* check compatibility */ | |
2917 | ||
2918 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
2919 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
2920 | ||
2921 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 2922 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
2923 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
2924 | } | |
2925 | goto done; | |
2926 | ||
1da177e4 | 2927 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 2928 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2929 | char req[64]; |
2930 | ||
c2c77ec8 | 2931 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2932 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2933 | goto done; |
2934 | } | |
2935 | ||
f2fcfcd6 GP |
2936 | /* throw out any old stored conf requests */ |
2937 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2938 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2939 | req, &result); | |
f2fcfcd6 | 2940 | if (len < 0) { |
e92c8e70 | 2941 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2942 | goto done; |
2943 | } | |
2944 | ||
2945 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2946 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2947 | chan->num_conf_req++; |
f2fcfcd6 GP |
2948 | if (result != L2CAP_CONF_SUCCESS) |
2949 | goto done; | |
2950 | break; | |
1da177e4 LT |
2951 | } |
2952 | ||
8e87d142 | 2953 | default: |
b1235d79 | 2954 | sk->sk_err = ECONNRESET; |
f3f668b0 | 2955 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 2956 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2957 | goto done; |
2958 | } | |
2959 | ||
2960 | if (flags & 0x01) | |
2961 | goto done; | |
2962 | ||
c1360a1c | 2963 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 2964 | |
c1360a1c | 2965 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 2966 | set_default_fcs(chan); |
fcc203c3 | 2967 | |
89bc500e | 2968 | l2cap_state_change(chan, BT_CONNECTED); |
42e5c802 GP |
2969 | chan->next_tx_seq = 0; |
2970 | chan->expected_tx_seq = 0; | |
58d35f87 | 2971 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2972 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2973 | l2cap_ertm_init(chan); |
0565c1c2 | 2974 | |
1da177e4 LT |
2975 | l2cap_chan_ready(sk); |
2976 | } | |
2977 | ||
2978 | done: | |
2979 | bh_unlock_sock(sk); | |
2980 | return 0; | |
2981 | } | |
2982 | ||
2983 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2984 | { | |
2985 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2986 | struct l2cap_disconn_rsp rsp; | |
2987 | u16 dcid, scid; | |
48454079 | 2988 | struct l2cap_chan *chan; |
1da177e4 LT |
2989 | struct sock *sk; |
2990 | ||
2991 | scid = __le16_to_cpu(req->scid); | |
2992 | dcid = __le16_to_cpu(req->dcid); | |
2993 | ||
2994 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2995 | ||
baa7e1fa | 2996 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2997 | if (!chan) |
1da177e4 LT |
2998 | return 0; |
2999 | ||
48454079 GP |
3000 | sk = chan->sk; |
3001 | ||
fe4128e0 GP |
3002 | rsp.dcid = cpu_to_le16(chan->scid); |
3003 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3004 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3005 | ||
3006 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3007 | ||
a49184c2 AE |
3008 | /* don't delete l2cap channel if sk is owned by user */ |
3009 | if (sock_owned_by_user(sk)) { | |
89bc500e | 3010 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 3011 | __clear_chan_timer(chan); |
f3f668b0 | 3012 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
a49184c2 AE |
3013 | bh_unlock_sock(sk); |
3014 | return 0; | |
3015 | } | |
3016 | ||
48454079 | 3017 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
3018 | bh_unlock_sock(sk); |
3019 | ||
ba3bd0ee | 3020 | chan->ops->close(chan->data); |
1da177e4 LT |
3021 | return 0; |
3022 | } | |
3023 | ||
3024 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3025 | { | |
3026 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3027 | u16 dcid, scid; | |
48454079 | 3028 | struct l2cap_chan *chan; |
1da177e4 LT |
3029 | struct sock *sk; |
3030 | ||
3031 | scid = __le16_to_cpu(rsp->scid); | |
3032 | dcid = __le16_to_cpu(rsp->dcid); | |
3033 | ||
3034 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3035 | ||
baa7e1fa | 3036 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3037 | if (!chan) |
1da177e4 LT |
3038 | return 0; |
3039 | ||
48454079 GP |
3040 | sk = chan->sk; |
3041 | ||
a49184c2 AE |
3042 | /* don't delete l2cap channel if sk is owned by user */ |
3043 | if (sock_owned_by_user(sk)) { | |
1ec918ce | 3044 | l2cap_state_change(chan, BT_DISCONN); |
c9b66675 | 3045 | __clear_chan_timer(chan); |
f3f668b0 | 3046 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
a49184c2 AE |
3047 | bh_unlock_sock(sk); |
3048 | return 0; | |
3049 | } | |
3050 | ||
48454079 | 3051 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
3052 | bh_unlock_sock(sk); |
3053 | ||
ba3bd0ee | 3054 | chan->ops->close(chan->data); |
1da177e4 LT |
3055 | return 0; |
3056 | } | |
3057 | ||
3058 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3059 | { | |
3060 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3061 | u16 type; |
3062 | ||
3063 | type = __le16_to_cpu(req->type); | |
3064 | ||
3065 | BT_DBG("type 0x%4.4x", type); | |
3066 | ||
f0709e03 MH |
3067 | if (type == L2CAP_IT_FEAT_MASK) { |
3068 | u8 buf[8]; | |
44dd46de | 3069 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3070 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3071 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3072 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3073 | if (!disable_ertm) |
fcc203c3 GP |
3074 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3075 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3076 | if (enable_hs) |
6327eb98 AE |
3077 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3078 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3079 | |
1b7bf4ed | 3080 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3081 | l2cap_send_cmd(conn, cmd->ident, |
3082 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3083 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3084 | u8 buf[12]; | |
3085 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3086 | |
3087 | if (enable_hs) | |
3088 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3089 | else | |
3090 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3091 | ||
e1027a7c MH |
3092 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3093 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3094 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3095 | l2cap_send_cmd(conn, cmd->ident, |
3096 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3097 | } else { |
3098 | struct l2cap_info_rsp rsp; | |
3099 | rsp.type = cpu_to_le16(type); | |
3100 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3101 | l2cap_send_cmd(conn, cmd->ident, | |
3102 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3103 | } | |
1da177e4 LT |
3104 | |
3105 | return 0; | |
3106 | } | |
3107 | ||
3108 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3109 | { | |
3110 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3111 | u16 type, result; | |
3112 | ||
3113 | type = __le16_to_cpu(rsp->type); | |
3114 | result = __le16_to_cpu(rsp->result); | |
3115 | ||
3116 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3117 | ||
e90165be AE |
3118 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3119 | if (cmd->ident != conn->info_ident || | |
3120 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3121 | return 0; | |
3122 | ||
4e8402a3 MH |
3123 | del_timer(&conn->info_timer); |
3124 | ||
adb08ede VT |
3125 | if (result != L2CAP_IR_SUCCESS) { |
3126 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3127 | conn->info_ident = 0; | |
3128 | ||
3129 | l2cap_conn_start(conn); | |
3130 | ||
3131 | return 0; | |
3132 | } | |
3133 | ||
984947dc | 3134 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3135 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3136 | |
47ec1dcd | 3137 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3138 | struct l2cap_info_req req; |
3139 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3140 | ||
3141 | conn->info_ident = l2cap_get_ident(conn); | |
3142 | ||
3143 | l2cap_send_cmd(conn, conn->info_ident, | |
3144 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3145 | } else { | |
3146 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3147 | conn->info_ident = 0; | |
3148 | ||
3149 | l2cap_conn_start(conn); | |
3150 | } | |
3151 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3152 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3153 | conn->info_ident = 0; |
984947dc MH |
3154 | |
3155 | l2cap_conn_start(conn); | |
3156 | } | |
4e8402a3 | 3157 | |
1da177e4 LT |
3158 | return 0; |
3159 | } | |
3160 | ||
f94ff6ff MM |
3161 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3162 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3163 | void *data) | |
3164 | { | |
3165 | struct l2cap_create_chan_req *req = data; | |
3166 | struct l2cap_create_chan_rsp rsp; | |
3167 | u16 psm, scid; | |
3168 | ||
3169 | if (cmd_len != sizeof(*req)) | |
3170 | return -EPROTO; | |
3171 | ||
3172 | if (!enable_hs) | |
3173 | return -EINVAL; | |
3174 | ||
3175 | psm = le16_to_cpu(req->psm); | |
3176 | scid = le16_to_cpu(req->scid); | |
3177 | ||
3178 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3179 | ||
3180 | /* Placeholder: Always reject */ | |
3181 | rsp.dcid = 0; | |
3182 | rsp.scid = cpu_to_le16(scid); | |
3183 | rsp.result = L2CAP_CR_NO_MEM; | |
3184 | rsp.status = L2CAP_CS_NO_INFO; | |
3185 | ||
3186 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3187 | sizeof(rsp), &rsp); | |
3188 | ||
3189 | return 0; | |
3190 | } | |
3191 | ||
3192 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3193 | struct l2cap_cmd_hdr *cmd, void *data) | |
3194 | { | |
3195 | BT_DBG("conn %p", conn); | |
3196 | ||
3197 | return l2cap_connect_rsp(conn, cmd, data); | |
3198 | } | |
3199 | ||
8d5a04a1 MM |
3200 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3201 | u16 icid, u16 result) | |
3202 | { | |
3203 | struct l2cap_move_chan_rsp rsp; | |
3204 | ||
3205 | BT_DBG("icid %d, result %d", icid, result); | |
3206 | ||
3207 | rsp.icid = cpu_to_le16(icid); | |
3208 | rsp.result = cpu_to_le16(result); | |
3209 | ||
3210 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3211 | } | |
3212 | ||
3213 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3214 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3215 | { | |
3216 | struct l2cap_move_chan_cfm cfm; | |
3217 | u8 ident; | |
3218 | ||
3219 | BT_DBG("icid %d, result %d", icid, result); | |
3220 | ||
3221 | ident = l2cap_get_ident(conn); | |
3222 | if (chan) | |
3223 | chan->ident = ident; | |
3224 | ||
3225 | cfm.icid = cpu_to_le16(icid); | |
3226 | cfm.result = cpu_to_le16(result); | |
3227 | ||
3228 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3229 | } | |
3230 | ||
3231 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3232 | u16 icid) | |
3233 | { | |
3234 | struct l2cap_move_chan_cfm_rsp rsp; | |
3235 | ||
3236 | BT_DBG("icid %d", icid); | |
3237 | ||
3238 | rsp.icid = cpu_to_le16(icid); | |
3239 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3240 | } | |
3241 | ||
3242 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3243 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3244 | { | |
3245 | struct l2cap_move_chan_req *req = data; | |
3246 | u16 icid = 0; | |
3247 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3248 | ||
3249 | if (cmd_len != sizeof(*req)) | |
3250 | return -EPROTO; | |
3251 | ||
3252 | icid = le16_to_cpu(req->icid); | |
3253 | ||
3254 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3255 | ||
3256 | if (!enable_hs) | |
3257 | return -EINVAL; | |
3258 | ||
3259 | /* Placeholder: Always refuse */ | |
3260 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3261 | ||
3262 | return 0; | |
3263 | } | |
3264 | ||
3265 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3266 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3267 | { | |
3268 | struct l2cap_move_chan_rsp *rsp = data; | |
3269 | u16 icid, result; | |
3270 | ||
3271 | if (cmd_len != sizeof(*rsp)) | |
3272 | return -EPROTO; | |
3273 | ||
3274 | icid = le16_to_cpu(rsp->icid); | |
3275 | result = le16_to_cpu(rsp->result); | |
3276 | ||
3277 | BT_DBG("icid %d, result %d", icid, result); | |
3278 | ||
3279 | /* Placeholder: Always unconfirmed */ | |
3280 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3281 | ||
3282 | return 0; | |
3283 | } | |
3284 | ||
3285 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3286 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3287 | { | |
3288 | struct l2cap_move_chan_cfm *cfm = data; | |
3289 | u16 icid, result; | |
3290 | ||
3291 | if (cmd_len != sizeof(*cfm)) | |
3292 | return -EPROTO; | |
3293 | ||
3294 | icid = le16_to_cpu(cfm->icid); | |
3295 | result = le16_to_cpu(cfm->result); | |
3296 | ||
3297 | BT_DBG("icid %d, result %d", icid, result); | |
3298 | ||
3299 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3300 | ||
3301 | return 0; | |
3302 | } | |
3303 | ||
3304 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3305 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3306 | { | |
3307 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3308 | u16 icid; | |
3309 | ||
3310 | if (cmd_len != sizeof(*rsp)) | |
3311 | return -EPROTO; | |
3312 | ||
3313 | icid = le16_to_cpu(rsp->icid); | |
3314 | ||
3315 | BT_DBG("icid %d", icid); | |
3316 | ||
3317 | return 0; | |
3318 | } | |
3319 | ||
e2174ca4 | 3320 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3321 | u16 to_multiplier) |
3322 | { | |
3323 | u16 max_latency; | |
3324 | ||
3325 | if (min > max || min < 6 || max > 3200) | |
3326 | return -EINVAL; | |
3327 | ||
3328 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3329 | return -EINVAL; | |
3330 | ||
3331 | if (max >= to_multiplier * 8) | |
3332 | return -EINVAL; | |
3333 | ||
3334 | max_latency = (to_multiplier * 8 / max) - 1; | |
3335 | if (latency > 499 || latency > max_latency) | |
3336 | return -EINVAL; | |
3337 | ||
3338 | return 0; | |
3339 | } | |
3340 | ||
3341 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3342 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3343 | { | |
3344 | struct hci_conn *hcon = conn->hcon; | |
3345 | struct l2cap_conn_param_update_req *req; | |
3346 | struct l2cap_conn_param_update_rsp rsp; | |
3347 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3348 | int err; |
de73115a CT |
3349 | |
3350 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3351 | return -EINVAL; | |
3352 | ||
3353 | cmd_len = __le16_to_cpu(cmd->len); | |
3354 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3355 | return -EPROTO; | |
3356 | ||
3357 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
3358 | min = __le16_to_cpu(req->min); |
3359 | max = __le16_to_cpu(req->max); | |
de73115a CT |
3360 | latency = __le16_to_cpu(req->latency); |
3361 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
3362 | ||
3363 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
3364 | min, max, latency, to_multiplier); | |
3365 | ||
3366 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
3367 | |
3368 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
3369 | if (err) | |
de73115a CT |
3370 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
3371 | else | |
3372 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
3373 | ||
3374 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
3375 | sizeof(rsp), &rsp); | |
3376 | ||
2ce603eb CT |
3377 | if (!err) |
3378 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
3379 | ||
de73115a CT |
3380 | return 0; |
3381 | } | |
3382 | ||
3300d9a9 CT |
3383 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
3384 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
3385 | { | |
3386 | int err = 0; | |
3387 | ||
3388 | switch (cmd->code) { | |
3389 | case L2CAP_COMMAND_REJ: | |
3390 | l2cap_command_rej(conn, cmd, data); | |
3391 | break; | |
3392 | ||
3393 | case L2CAP_CONN_REQ: | |
3394 | err = l2cap_connect_req(conn, cmd, data); | |
3395 | break; | |
3396 | ||
3397 | case L2CAP_CONN_RSP: | |
3398 | err = l2cap_connect_rsp(conn, cmd, data); | |
3399 | break; | |
3400 | ||
3401 | case L2CAP_CONF_REQ: | |
3402 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
3403 | break; | |
3404 | ||
3405 | case L2CAP_CONF_RSP: | |
3406 | err = l2cap_config_rsp(conn, cmd, data); | |
3407 | break; | |
3408 | ||
3409 | case L2CAP_DISCONN_REQ: | |
3410 | err = l2cap_disconnect_req(conn, cmd, data); | |
3411 | break; | |
3412 | ||
3413 | case L2CAP_DISCONN_RSP: | |
3414 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3415 | break; | |
3416 | ||
3417 | case L2CAP_ECHO_REQ: | |
3418 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3419 | break; | |
3420 | ||
3421 | case L2CAP_ECHO_RSP: | |
3422 | break; | |
3423 | ||
3424 | case L2CAP_INFO_REQ: | |
3425 | err = l2cap_information_req(conn, cmd, data); | |
3426 | break; | |
3427 | ||
3428 | case L2CAP_INFO_RSP: | |
3429 | err = l2cap_information_rsp(conn, cmd, data); | |
3430 | break; | |
3431 | ||
f94ff6ff MM |
3432 | case L2CAP_CREATE_CHAN_REQ: |
3433 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
3434 | break; | |
3435 | ||
3436 | case L2CAP_CREATE_CHAN_RSP: | |
3437 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
3438 | break; | |
3439 | ||
8d5a04a1 MM |
3440 | case L2CAP_MOVE_CHAN_REQ: |
3441 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
3442 | break; | |
3443 | ||
3444 | case L2CAP_MOVE_CHAN_RSP: | |
3445 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
3446 | break; | |
3447 | ||
3448 | case L2CAP_MOVE_CHAN_CFM: | |
3449 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
3450 | break; | |
3451 | ||
3452 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
3453 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
3454 | break; | |
3455 | ||
3300d9a9 CT |
3456 | default: |
3457 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3458 | err = -EINVAL; | |
3459 | break; | |
3460 | } | |
3461 | ||
3462 | return err; | |
3463 | } | |
3464 | ||
3465 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3466 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3467 | { | |
3468 | switch (cmd->code) { | |
3469 | case L2CAP_COMMAND_REJ: | |
3470 | return 0; | |
3471 | ||
3472 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3473 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3474 | |
3475 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3476 | return 0; | |
3477 | ||
3478 | default: | |
3479 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3480 | return -EINVAL; | |
3481 | } | |
3482 | } | |
3483 | ||
3484 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3485 | struct sk_buff *skb) | |
1da177e4 LT |
3486 | { |
3487 | u8 *data = skb->data; | |
3488 | int len = skb->len; | |
3489 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3490 | int err; |
1da177e4 LT |
3491 | |
3492 | l2cap_raw_recv(conn, skb); | |
3493 | ||
3494 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3495 | u16 cmd_len; |
1da177e4 LT |
3496 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3497 | data += L2CAP_CMD_HDR_SIZE; | |
3498 | len -= L2CAP_CMD_HDR_SIZE; | |
3499 | ||
88219a0f | 3500 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3501 | |
88219a0f | 3502 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3503 | |
88219a0f | 3504 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3505 | BT_DBG("corrupted command"); |
3506 | break; | |
3507 | } | |
3508 | ||
3300d9a9 CT |
3509 | if (conn->hcon->type == LE_LINK) |
3510 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3511 | else | |
3512 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3513 | |
3514 | if (err) { | |
e2fd318e | 3515 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3516 | |
3517 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3518 | |
3519 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3520 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3521 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3522 | } | |
3523 | ||
88219a0f AV |
3524 | data += cmd_len; |
3525 | len -= cmd_len; | |
1da177e4 LT |
3526 | } |
3527 | ||
3528 | kfree_skb(skb); | |
3529 | } | |
3530 | ||
47d1ec61 | 3531 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3532 | { |
3533 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
3534 | int hdr_size; |
3535 | ||
3536 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3537 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
3538 | else | |
3539 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 3540 | |
47d1ec61 | 3541 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 3542 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
3543 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3544 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3545 | ||
3546 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3547 | return -EBADMSG; |
fcc203c3 GP |
3548 | } |
3549 | return 0; | |
3550 | } | |
3551 | ||
525cd185 | 3552 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3553 | { |
88843ab0 | 3554 | u32 control = 0; |
d5392c8f | 3555 | |
6a026610 | 3556 | chan->frames_sent = 0; |
d5392c8f | 3557 | |
0b209fae | 3558 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3559 | |
e2ab4353 | 3560 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3561 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3562 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3563 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3564 | } |
3565 | ||
e2ab4353 | 3566 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3567 | l2cap_retransmit_frames(chan); |
d5392c8f | 3568 | |
525cd185 | 3569 | l2cap_ertm_send(chan); |
d5392c8f | 3570 | |
e2ab4353 | 3571 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3572 | chan->frames_sent == 0) { |
ab784b73 | 3573 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3574 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3575 | } |
3576 | } | |
3577 | ||
fb45de7d | 3578 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
3579 | { |
3580 | struct sk_buff *next_skb; | |
bfbacc11 | 3581 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
3582 | |
3583 | bt_cb(skb)->tx_seq = tx_seq; | |
3584 | bt_cb(skb)->sar = sar; | |
3585 | ||
f1c6775b | 3586 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 3587 | |
836be934 | 3588 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 3589 | |
039d9572 | 3590 | while (next_skb) { |
9b53350d JPRV |
3591 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3592 | return -EINVAL; | |
3593 | ||
836be934 AE |
3594 | next_tx_seq_offset = __seq_offset(chan, |
3595 | bt_cb(next_skb)->tx_seq, chan->buffer_seq); | |
bfbacc11 JPRV |
3596 | |
3597 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 3598 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 3599 | return 0; |
8f17154f GP |
3600 | } |
3601 | ||
f1c6775b | 3602 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
039d9572 SJ |
3603 | next_skb = NULL; |
3604 | else | |
3605 | next_skb = skb_queue_next(&chan->srej_q, next_skb); | |
3606 | } | |
8f17154f | 3607 | |
f1c6775b | 3608 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
3609 | |
3610 | return 0; | |
8f17154f GP |
3611 | } |
3612 | ||
84084a31 MM |
3613 | static void append_skb_frag(struct sk_buff *skb, |
3614 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 3615 | { |
84084a31 MM |
3616 | /* skb->len reflects data in skb as well as all fragments |
3617 | * skb->data_len reflects only data in fragments | |
3618 | */ | |
3619 | if (!skb_has_frag_list(skb)) | |
3620 | skb_shinfo(skb)->frag_list = new_frag; | |
3621 | ||
3622 | new_frag->next = NULL; | |
3623 | ||
3624 | (*last_frag)->next = new_frag; | |
3625 | *last_frag = new_frag; | |
3626 | ||
3627 | skb->len += new_frag->len; | |
3628 | skb->data_len += new_frag->len; | |
3629 | skb->truesize += new_frag->truesize; | |
3630 | } | |
3631 | ||
88843ab0 | 3632 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
3633 | { |
3634 | int err = -EINVAL; | |
18778a63 | 3635 | |
7e0ef6ee AE |
3636 | switch (__get_ctrl_sar(chan, control)) { |
3637 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
3638 | if (chan->sdu) |
3639 | break; | |
18778a63 | 3640 | |
84084a31 MM |
3641 | err = chan->ops->recv(chan->data, skb); |
3642 | break; | |
18778a63 | 3643 | |
7e0ef6ee | 3644 | case L2CAP_SAR_START: |
84084a31 MM |
3645 | if (chan->sdu) |
3646 | break; | |
18778a63 | 3647 | |
6f61fd47 | 3648 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 3649 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 3650 | |
84084a31 MM |
3651 | if (chan->sdu_len > chan->imtu) { |
3652 | err = -EMSGSIZE; | |
3653 | break; | |
3654 | } | |
1890d36b | 3655 | |
84084a31 MM |
3656 | if (skb->len >= chan->sdu_len) |
3657 | break; | |
18778a63 | 3658 | |
84084a31 MM |
3659 | chan->sdu = skb; |
3660 | chan->sdu_last_frag = skb; | |
18778a63 | 3661 | |
84084a31 MM |
3662 | skb = NULL; |
3663 | err = 0; | |
18778a63 GP |
3664 | break; |
3665 | ||
7e0ef6ee | 3666 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 3667 | if (!chan->sdu) |
84084a31 | 3668 | break; |
18778a63 | 3669 | |
84084a31 MM |
3670 | append_skb_frag(chan->sdu, skb, |
3671 | &chan->sdu_last_frag); | |
3672 | skb = NULL; | |
18778a63 | 3673 | |
84084a31 MM |
3674 | if (chan->sdu->len >= chan->sdu_len) |
3675 | break; | |
4178ba46 | 3676 | |
84084a31 | 3677 | err = 0; |
18778a63 GP |
3678 | break; |
3679 | ||
7e0ef6ee | 3680 | case L2CAP_SAR_END: |
6f61fd47 | 3681 | if (!chan->sdu) |
84084a31 | 3682 | break; |
18778a63 | 3683 | |
84084a31 MM |
3684 | append_skb_frag(chan->sdu, skb, |
3685 | &chan->sdu_last_frag); | |
3686 | skb = NULL; | |
4178ba46 | 3687 | |
84084a31 MM |
3688 | if (chan->sdu->len != chan->sdu_len) |
3689 | break; | |
18778a63 | 3690 | |
84084a31 | 3691 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 3692 | |
84084a31 MM |
3693 | if (!err) { |
3694 | /* Reassembly complete */ | |
3695 | chan->sdu = NULL; | |
3696 | chan->sdu_last_frag = NULL; | |
3697 | chan->sdu_len = 0; | |
1890d36b | 3698 | } |
18778a63 GP |
3699 | break; |
3700 | } | |
3701 | ||
84084a31 MM |
3702 | if (err) { |
3703 | kfree_skb(skb); | |
3704 | kfree_skb(chan->sdu); | |
3705 | chan->sdu = NULL; | |
3706 | chan->sdu_last_frag = NULL; | |
3707 | chan->sdu_len = 0; | |
3708 | } | |
18778a63 | 3709 | |
84084a31 | 3710 | return err; |
18778a63 GP |
3711 | } |
3712 | ||
26f880d2 | 3713 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 3714 | { |
88843ab0 | 3715 | u32 control; |
712132eb | 3716 | |
26f880d2 | 3717 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 3718 | |
26f880d2 MM |
3719 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3720 | ||
0b209fae | 3721 | control = __set_reqseq(chan, chan->buffer_seq); |
ab784b73 | 3722 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
26f880d2 MM |
3723 | l2cap_send_sframe(chan, control); |
3724 | ||
3725 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
3726 | ||
3727 | __clear_ack_timer(chan); | |
3728 | } | |
3729 | ||
3730 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
3731 | { | |
88843ab0 | 3732 | u32 control; |
712132eb | 3733 | |
e2ab4353 | 3734 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
3735 | goto done; |
3736 | ||
0b209fae | 3737 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 3738 | control |= __set_ctrl_poll(chan); |
ab784b73 | 3739 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3740 | l2cap_send_sframe(chan, control); |
6a026610 | 3741 | chan->retry_count = 1; |
712132eb | 3742 | |
1a09bcb9 GP |
3743 | __clear_retrans_timer(chan); |
3744 | __set_monitor_timer(chan); | |
712132eb | 3745 | |
e2ab4353 | 3746 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
3747 | |
3748 | done: | |
e2ab4353 GP |
3749 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3750 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 3751 | |
49208c9c | 3752 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
3753 | } |
3754 | ||
e328140f | 3755 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 3756 | { |
e328140f MM |
3757 | if (chan->mode == L2CAP_MODE_ERTM) { |
3758 | if (busy) | |
3759 | l2cap_ertm_enter_local_busy(chan); | |
3760 | else | |
3761 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 3762 | } |
1890d36b GP |
3763 | } |
3764 | ||
fb45de7d | 3765 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
3766 | { |
3767 | struct sk_buff *skb; | |
88843ab0 | 3768 | u32 control; |
8f17154f | 3769 | |
e328140f MM |
3770 | while ((skb = skb_peek(&chan->srej_q)) && |
3771 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
3772 | int err; | |
3773 | ||
8f17154f GP |
3774 | if (bt_cb(skb)->tx_seq != tx_seq) |
3775 | break; | |
3776 | ||
f1c6775b | 3777 | skb = skb_dequeue(&chan->srej_q); |
7e0ef6ee | 3778 | control = __set_ctrl_sar(chan, bt_cb(skb)->sar); |
84084a31 | 3779 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
3780 | |
3781 | if (err < 0) { | |
3782 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3783 | break; | |
3784 | } | |
3785 | ||
836be934 AE |
3786 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
3787 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
3788 | } |
3789 | } | |
3790 | ||
fb45de7d | 3791 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3792 | { |
8f17154f | 3793 | struct srej_list *l, *tmp; |
88843ab0 | 3794 | u32 control; |
8f17154f | 3795 | |
39d5a3ee | 3796 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3797 | if (l->tx_seq == tx_seq) { |
3798 | list_del(&l->list); | |
3799 | kfree(l); | |
3800 | return; | |
3801 | } | |
ab784b73 | 3802 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3803 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 3804 | l2cap_send_sframe(chan, control); |
8f17154f | 3805 | list_del(&l->list); |
39d5a3ee | 3806 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3807 | } |
3808 | } | |
3809 | ||
aef89f21 | 3810 | static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 3811 | { |
8f17154f | 3812 | struct srej_list *new; |
88843ab0 | 3813 | u32 control; |
8f17154f | 3814 | |
42e5c802 | 3815 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 3816 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 3817 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
525cd185 | 3818 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3819 | |
3820 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
aef89f21 SJ |
3821 | if (!new) |
3822 | return -ENOMEM; | |
3823 | ||
42e5c802 | 3824 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
3825 | |
3826 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
3827 | ||
39d5a3ee | 3828 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3829 | } |
836be934 AE |
3830 | |
3831 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
aef89f21 SJ |
3832 | |
3833 | return 0; | |
8f17154f GP |
3834 | } |
3835 | ||
88843ab0 | 3836 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 3837 | { |
fb45de7d | 3838 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 3839 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 3840 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 3841 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3842 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3843 | int err = 0; |
3844 | ||
88843ab0 | 3845 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 3846 | tx_seq, rx_control); |
1c2acffb | 3847 | |
03f6715d | 3848 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 3849 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 3850 | __clear_monitor_timer(chan); |
6a026610 | 3851 | if (chan->unacked_frames > 0) |
1a09bcb9 | 3852 | __set_retrans_timer(chan); |
e2ab4353 | 3853 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
3854 | } |
3855 | ||
42e5c802 GP |
3856 | chan->expected_ack_seq = req_seq; |
3857 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3858 | |
836be934 | 3859 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
3860 | |
3861 | /* invalid tx_seq */ | |
47d1ec61 | 3862 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 3863 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
3864 | goto drop; |
3865 | } | |
3866 | ||
e2ab4353 | 3867 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1890d36b GP |
3868 | goto drop; |
3869 | ||
02f1b641 MM |
3870 | if (tx_seq == chan->expected_tx_seq) |
3871 | goto expected; | |
3872 | ||
e2ab4353 | 3873 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 3874 | struct srej_list *first; |
30afb5b2 | 3875 | |
39d5a3ee | 3876 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3877 | struct srej_list, list); |
3878 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3879 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3880 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3881 | |
3882 | list_del(&first->list); | |
3883 | kfree(first); | |
3884 | ||
39d5a3ee | 3885 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3886 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 3887 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 3888 | l2cap_send_ack(chan); |
49208c9c | 3889 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3890 | } |
3891 | } else { | |
3892 | struct srej_list *l; | |
9b53350d JPRV |
3893 | |
3894 | /* duplicated tx_seq */ | |
42e5c802 | 3895 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3896 | goto drop; |
8f17154f | 3897 | |
39d5a3ee | 3898 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3899 | if (l->tx_seq == tx_seq) { |
525cd185 | 3900 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3901 | return 0; |
3902 | } | |
3903 | } | |
aef89f21 SJ |
3904 | |
3905 | err = l2cap_send_srejframe(chan, tx_seq); | |
3906 | if (err < 0) { | |
3907 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3908 | return err; | |
3909 | } | |
30afb5b2 GP |
3910 | } |
3911 | } else { | |
836be934 AE |
3912 | expected_tx_seq_offset = __seq_offset(chan, |
3913 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
3914 | |
3915 | /* duplicated tx_seq */ | |
3916 | if (tx_seq_offset < expected_tx_seq_offset) | |
3917 | goto drop; | |
3918 | ||
e2ab4353 | 3919 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 3920 | |
49208c9c | 3921 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3922 | |
39d5a3ee | 3923 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3924 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3925 | |
f1c6775b | 3926 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 3927 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3928 | |
e2ab4353 | 3929 | set_bit(CONN_SEND_PBIT, &chan->conn_state); |
ef54fd93 | 3930 | |
aef89f21 SJ |
3931 | err = l2cap_send_srejframe(chan, tx_seq); |
3932 | if (err < 0) { | |
3933 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3934 | return err; | |
3935 | } | |
7fe9b298 | 3936 | |
1a09bcb9 | 3937 | __clear_ack_timer(chan); |
1c2acffb | 3938 | } |
30afb5b2 GP |
3939 | return 0; |
3940 | ||
8f17154f | 3941 | expected: |
836be934 | 3942 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 3943 | |
e2ab4353 | 3944 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3b1a9f3f GP |
3945 | bt_cb(skb)->tx_seq = tx_seq; |
3946 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3947 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3948 | return 0; |
3949 | } | |
3950 | ||
84084a31 | 3951 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
3952 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
3953 | ||
e328140f MM |
3954 | if (err < 0) { |
3955 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
3956 | return err; | |
3957 | } | |
2ece3684 | 3958 | |
03f6715d | 3959 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 3960 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 3961 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3962 | } |
3963 | ||
c1b4f43b | 3964 | |
6a026610 GP |
3965 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3966 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3967 | l2cap_send_ack(chan); |
4d611e4d GP |
3968 | else |
3969 | __set_ack_timer(chan); | |
9e917af1 | 3970 | |
8f17154f | 3971 | return 0; |
9b53350d JPRV |
3972 | |
3973 | drop: | |
3974 | kfree_skb(skb); | |
3975 | return 0; | |
1c2acffb GP |
3976 | } |
3977 | ||
88843ab0 | 3978 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 3979 | { |
88843ab0 | 3980 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 3981 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 3982 | |
0b209fae | 3983 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 3984 | l2cap_drop_acked_frames(chan); |
1c2acffb | 3985 | |
e3781735 | 3986 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
3987 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3988 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
3989 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 3990 | (chan->unacked_frames > 0)) |
1a09bcb9 | 3991 | __set_retrans_timer(chan); |
05fbd89d | 3992 | |
e2ab4353 | 3993 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 3994 | l2cap_send_srejtail(chan); |
05fbd89d | 3995 | } else { |
525cd185 | 3996 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3997 | } |
1d8f5d16 | 3998 | |
03f6715d | 3999 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4000 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 4001 | |
e2ab4353 | 4002 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4003 | l2cap_retransmit_frames(chan); |
2246b2f1 | 4004 | |
e072745f | 4005 | } else { |
e2ab4353 | 4006 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 4007 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4008 | __set_retrans_timer(chan); |
1c2acffb | 4009 | |
e2ab4353 GP |
4010 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4011 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 4012 | l2cap_send_ack(chan); |
894718a6 | 4013 | else |
525cd185 | 4014 | l2cap_ertm_send(chan); |
e072745f GP |
4015 | } |
4016 | } | |
2246b2f1 | 4017 | |
88843ab0 | 4018 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4019 | { |
0b209fae | 4020 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4021 | |
88843ab0 | 4022 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4023 | |
e2ab4353 | 4024 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 4025 | |
42e5c802 GP |
4026 | chan->expected_ack_seq = tx_seq; |
4027 | l2cap_drop_acked_frames(chan); | |
e072745f | 4028 | |
03f6715d | 4029 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4030 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4031 | l2cap_retransmit_frames(chan); |
e072745f | 4032 | } else { |
525cd185 | 4033 | l2cap_retransmit_frames(chan); |
30afb5b2 | 4034 | |
e2ab4353 GP |
4035 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
4036 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
4037 | } |
4038 | } | |
88843ab0 | 4039 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4040 | { |
0b209fae | 4041 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4042 | |
88843ab0 | 4043 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4044 | |
e2ab4353 | 4045 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 4046 | |
e3781735 | 4047 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
4048 | chan->expected_ack_seq = tx_seq; |
4049 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 4050 | |
e2ab4353 | 4051 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 4052 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 4053 | |
525cd185 | 4054 | l2cap_ertm_send(chan); |
dfc909be | 4055 | |
e2ab4353 | 4056 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4057 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4058 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4059 | } |
03f6715d | 4060 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4061 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4062 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4063 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4064 | else |
525cd185 | 4065 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4066 | } else { |
525cd185 | 4067 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4068 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4069 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4070 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4071 | } |
e072745f GP |
4072 | } |
4073 | } | |
4074 | ||
88843ab0 | 4075 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4076 | { |
0b209fae | 4077 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4078 | |
88843ab0 | 4079 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4080 | |
e2ab4353 | 4081 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4082 | chan->expected_ack_seq = tx_seq; |
4083 | l2cap_drop_acked_frames(chan); | |
e072745f | 4084 | |
e3781735 | 4085 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4086 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4087 | |
e2ab4353 | 4088 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4089 | __clear_retrans_timer(chan); |
e3781735 | 4090 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4091 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4092 | return; |
e072745f | 4093 | } |
99b0d4b7 | 4094 | |
e3781735 | 4095 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4096 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4097 | } else { |
4098 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
4099 | l2cap_send_sframe(chan, rx_control); | |
4100 | } | |
e072745f GP |
4101 | } |
4102 | ||
88843ab0 | 4103 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4104 | { |
88843ab0 | 4105 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4106 | |
03f6715d | 4107 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4108 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4109 | __clear_monitor_timer(chan); |
6a026610 | 4110 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4111 | __set_retrans_timer(chan); |
e2ab4353 | 4112 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4113 | } |
4114 | ||
ab784b73 AE |
4115 | switch (__get_ctrl_super(chan, rx_control)) { |
4116 | case L2CAP_SUPER_RR: | |
525cd185 | 4117 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4118 | break; |
4119 | ||
ab784b73 | 4120 | case L2CAP_SUPER_REJ: |
525cd185 | 4121 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4122 | break; |
2246b2f1 | 4123 | |
ab784b73 | 4124 | case L2CAP_SUPER_SREJ: |
525cd185 | 4125 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4126 | break; |
4127 | ||
ab784b73 | 4128 | case L2CAP_SUPER_RNR: |
525cd185 | 4129 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4130 | break; |
4131 | } | |
4132 | ||
faaebd19 | 4133 | kfree_skb(skb); |
1c2acffb GP |
4134 | return 0; |
4135 | } | |
4136 | ||
218bb9df GP |
4137 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
4138 | { | |
525cd185 | 4139 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
88843ab0 | 4140 | u32 control; |
0b209fae | 4141 | u16 req_seq; |
218bb9df GP |
4142 | int len, next_tx_seq_offset, req_seq_offset; |
4143 | ||
88843ab0 AE |
4144 | control = __get_control(chan, skb->data); |
4145 | skb_pull(skb, __ctrl_size(chan)); | |
218bb9df GP |
4146 | len = skb->len; |
4147 | ||
4148 | /* | |
4149 | * We can just drop the corrupted I-frame here. | |
4150 | * Receiver will miss it and start proper recovery | |
4151 | * procedures and ask retransmission. | |
4152 | */ | |
47d1ec61 | 4153 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4154 | goto drop; |
4155 | ||
793c2f1c | 4156 | if (__is_sar_start(chan, control) && !__is_sframe(chan, control)) |
03a51213 | 4157 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4158 | |
47d1ec61 | 4159 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4160 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4161 | |
47d1ec61 | 4162 | if (len > chan->mps) { |
8c1d787b | 4163 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4164 | goto drop; |
4165 | } | |
4166 | ||
0b209fae | 4167 | req_seq = __get_reqseq(chan, control); |
218bb9df | 4168 | |
836be934 AE |
4169 | req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); |
4170 | ||
4171 | next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, | |
4172 | chan->expected_ack_seq); | |
218bb9df GP |
4173 | |
4174 | /* check for invalid req-seq */ | |
4175 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 4176 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4177 | goto drop; |
4178 | } | |
4179 | ||
793c2f1c | 4180 | if (!__is_sframe(chan, control)) { |
218bb9df | 4181 | if (len < 0) { |
8c1d787b | 4182 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4183 | goto drop; |
4184 | } | |
4185 | ||
525cd185 | 4186 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
4187 | } else { |
4188 | if (len != 0) { | |
4189 | BT_ERR("%d", len); | |
8c1d787b | 4190 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4191 | goto drop; |
4192 | } | |
4193 | ||
525cd185 | 4194 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
4195 | } |
4196 | ||
4197 | return 0; | |
4198 | ||
4199 | drop: | |
4200 | kfree_skb(skb); | |
4201 | return 0; | |
4202 | } | |
4203 | ||
1da177e4 LT |
4204 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4205 | { | |
48454079 | 4206 | struct l2cap_chan *chan; |
bf734843 | 4207 | struct sock *sk = NULL; |
88843ab0 | 4208 | u32 control; |
fb45de7d | 4209 | u16 tx_seq; |
218bb9df | 4210 | int len; |
1da177e4 | 4211 | |
baa7e1fa | 4212 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4213 | if (!chan) { |
1da177e4 LT |
4214 | BT_DBG("unknown cid 0x%4.4x", cid); |
4215 | goto drop; | |
4216 | } | |
4217 | ||
48454079 | 4218 | sk = chan->sk; |
6840ed07 | 4219 | |
49208c9c | 4220 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4221 | |
89bc500e | 4222 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4223 | goto drop; |
4224 | ||
0c1bc5c6 | 4225 | switch (chan->mode) { |
1c2acffb GP |
4226 | case L2CAP_MODE_BASIC: |
4227 | /* If socket recv buffers overflows we drop data here | |
4228 | * which is *bad* because L2CAP has to be reliable. | |
4229 | * But we don't have any other choice. L2CAP doesn't | |
4230 | * provide flow control mechanism. */ | |
1da177e4 | 4231 | |
0c1bc5c6 | 4232 | if (chan->imtu < skb->len) |
1c2acffb | 4233 | goto drop; |
1da177e4 | 4234 | |
23070494 | 4235 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4236 | goto done; |
4237 | break; | |
4238 | ||
4239 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
4240 | if (!sock_owned_by_user(sk)) { |
4241 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 4242 | } else { |
218bb9df | 4243 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 4244 | goto drop; |
277ffbe3 | 4245 | } |
1c2acffb | 4246 | |
fcafde2e | 4247 | goto done; |
1c2acffb | 4248 | |
6840ed07 | 4249 | case L2CAP_MODE_STREAMING: |
88843ab0 AE |
4250 | control = __get_control(chan, skb->data); |
4251 | skb_pull(skb, __ctrl_size(chan)); | |
6840ed07 GP |
4252 | len = skb->len; |
4253 | ||
47d1ec61 | 4254 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
4255 | goto drop; |
4256 | ||
7e0ef6ee | 4257 | if (__is_sar_start(chan, control)) |
03a51213 | 4258 | len -= L2CAP_SDULEN_SIZE; |
6840ed07 | 4259 | |
47d1ec61 | 4260 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4261 | len -= L2CAP_FCS_SIZE; |
fcc203c3 | 4262 | |
793c2f1c | 4263 | if (len > chan->mps || len < 0 || __is_sframe(chan, control)) |
6840ed07 GP |
4264 | goto drop; |
4265 | ||
fb45de7d | 4266 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 4267 | |
84084a31 MM |
4268 | if (chan->expected_tx_seq != tx_seq) { |
4269 | /* Frame(s) missing - must discard partial SDU */ | |
4270 | kfree_skb(chan->sdu); | |
4271 | chan->sdu = NULL; | |
4272 | chan->sdu_last_frag = NULL; | |
4273 | chan->sdu_len = 0; | |
6840ed07 | 4274 | |
84084a31 MM |
4275 | /* TODO: Notify userland of missing data */ |
4276 | } | |
4277 | ||
836be934 | 4278 | chan->expected_tx_seq = __next_seq(chan, tx_seq); |
84084a31 MM |
4279 | |
4280 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
4281 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
4282 | |
4283 | goto done; | |
4284 | ||
1c2acffb | 4285 | default: |
0c1bc5c6 | 4286 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4287 | break; |
4288 | } | |
1da177e4 LT |
4289 | |
4290 | drop: | |
4291 | kfree_skb(skb); | |
4292 | ||
4293 | done: | |
0139418c MH |
4294 | if (sk) |
4295 | bh_unlock_sock(sk); | |
4296 | ||
1da177e4 LT |
4297 | return 0; |
4298 | } | |
4299 | ||
8e036fc3 | 4300 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4301 | { |
6dcae1ea | 4302 | struct sock *sk = NULL; |
23691d75 | 4303 | struct l2cap_chan *chan; |
1da177e4 | 4304 | |
23691d75 GP |
4305 | chan = l2cap_global_chan_by_psm(0, psm, conn->src); |
4306 | if (!chan) | |
1da177e4 LT |
4307 | goto drop; |
4308 | ||
23691d75 GP |
4309 | sk = chan->sk; |
4310 | ||
e0f0cb56 GP |
4311 | bh_lock_sock(sk); |
4312 | ||
1da177e4 LT |
4313 | BT_DBG("sk %p, len %d", sk, skb->len); |
4314 | ||
89bc500e | 4315 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4316 | goto drop; |
4317 | ||
e13e21dc | 4318 | if (chan->imtu < skb->len) |
1da177e4 LT |
4319 | goto drop; |
4320 | ||
23070494 | 4321 | if (!chan->ops->recv(chan->data, skb)) |
1da177e4 LT |
4322 | goto done; |
4323 | ||
4324 | drop: | |
4325 | kfree_skb(skb); | |
4326 | ||
4327 | done: | |
af05b30b GP |
4328 | if (sk) |
4329 | bh_unlock_sock(sk); | |
1da177e4 LT |
4330 | return 0; |
4331 | } | |
4332 | ||
9f69bda6 GP |
4333 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
4334 | { | |
6dcae1ea | 4335 | struct sock *sk = NULL; |
23691d75 | 4336 | struct l2cap_chan *chan; |
9f69bda6 | 4337 | |
23691d75 GP |
4338 | chan = l2cap_global_chan_by_scid(0, cid, conn->src); |
4339 | if (!chan) | |
9f69bda6 GP |
4340 | goto drop; |
4341 | ||
23691d75 GP |
4342 | sk = chan->sk; |
4343 | ||
9f69bda6 GP |
4344 | bh_lock_sock(sk); |
4345 | ||
4346 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4347 | ||
89bc500e | 4348 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4349 | goto drop; |
4350 | ||
e13e21dc | 4351 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4352 | goto drop; |
4353 | ||
23070494 | 4354 | if (!chan->ops->recv(chan->data, skb)) |
9f69bda6 GP |
4355 | goto done; |
4356 | ||
4357 | drop: | |
4358 | kfree_skb(skb); | |
4359 | ||
4360 | done: | |
4361 | if (sk) | |
4362 | bh_unlock_sock(sk); | |
4363 | return 0; | |
4364 | } | |
4365 | ||
1da177e4 LT |
4366 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4367 | { | |
4368 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4369 | u16 cid, len; |
4370 | __le16 psm; | |
1da177e4 LT |
4371 | |
4372 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4373 | cid = __le16_to_cpu(lh->cid); | |
4374 | len = __le16_to_cpu(lh->len); | |
4375 | ||
1c2acffb GP |
4376 | if (len != skb->len) { |
4377 | kfree_skb(skb); | |
4378 | return; | |
4379 | } | |
4380 | ||
1da177e4 LT |
4381 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4382 | ||
4383 | switch (cid) { | |
3300d9a9 | 4384 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4385 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4386 | l2cap_sig_channel(conn, skb); |
4387 | break; | |
4388 | ||
8db4dc46 | 4389 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4390 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4391 | skb_pull(skb, 2); |
4392 | l2cap_conless_channel(conn, psm, skb); | |
4393 | break; | |
4394 | ||
9f69bda6 GP |
4395 | case L2CAP_CID_LE_DATA: |
4396 | l2cap_att_channel(conn, cid, skb); | |
4397 | break; | |
4398 | ||
b501d6a1 AB |
4399 | case L2CAP_CID_SMP: |
4400 | if (smp_sig_channel(conn, skb)) | |
4401 | l2cap_conn_del(conn->hcon, EACCES); | |
4402 | break; | |
4403 | ||
1da177e4 LT |
4404 | default: |
4405 | l2cap_data_channel(conn, cid, skb); | |
4406 | break; | |
4407 | } | |
4408 | } | |
4409 | ||
4410 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4411 | ||
4412 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4413 | { | |
4414 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4415 | struct l2cap_chan *c; |
1da177e4 LT |
4416 | |
4417 | if (type != ACL_LINK) | |
963cf687 | 4418 | return -EINVAL; |
1da177e4 LT |
4419 | |
4420 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4421 | ||
4422 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4423 | read_lock(&chan_list_lock); |
4424 | list_for_each_entry(c, &chan_list, global_l) { | |
4425 | struct sock *sk = c->sk; | |
4343478f | 4426 | |
89bc500e | 4427 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4428 | continue; |
4429 | ||
4430 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4431 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4432 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4433 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4434 | exact++; |
2af6b9d5 MH |
4435 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4436 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4437 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4438 | lm2 |= HCI_LM_MASTER; |
4439 | } | |
1da177e4 | 4440 | } |
23691d75 | 4441 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4442 | |
4443 | return exact ? lm1 : lm2; | |
4444 | } | |
4445 | ||
4446 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4447 | { | |
0139418c MH |
4448 | struct l2cap_conn *conn; |
4449 | ||
1da177e4 LT |
4450 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4451 | ||
acd7d370 | 4452 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4453 | return -EINVAL; |
1da177e4 LT |
4454 | |
4455 | if (!status) { | |
1da177e4 LT |
4456 | conn = l2cap_conn_add(hcon, status); |
4457 | if (conn) | |
4458 | l2cap_conn_ready(conn); | |
0139418c | 4459 | } else |
e175072f | 4460 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4461 | |
4462 | return 0; | |
4463 | } | |
4464 | ||
2950f21a MH |
4465 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4466 | { | |
4467 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4468 | ||
4469 | BT_DBG("hcon %p", hcon); | |
4470 | ||
b5694506 | 4471 | if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn) |
9f5a0d7b | 4472 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4473 | |
4474 | return conn->disc_reason; | |
4475 | } | |
4476 | ||
4477 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4478 | { |
4479 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4480 | ||
acd7d370 | 4481 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 4482 | return -EINVAL; |
1da177e4 | 4483 | |
e175072f | 4484 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
0139418c | 4485 | |
1da177e4 LT |
4486 | return 0; |
4487 | } | |
4488 | ||
4343478f | 4489 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4490 | { |
715ec005 | 4491 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4492 | return; |
4493 | ||
f62e4323 | 4494 | if (encrypt == 0x00) { |
4343478f | 4495 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
c9b66675 | 4496 | __clear_chan_timer(chan); |
f3f668b0 | 4497 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 4498 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4499 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4500 | } else { |
4343478f | 4501 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4502 | __clear_chan_timer(chan); |
f62e4323 MH |
4503 | } |
4504 | } | |
4505 | ||
8c1b2355 | 4506 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4507 | { |
0139418c | 4508 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4509 | struct l2cap_chan *chan; |
1da177e4 | 4510 | |
0139418c | 4511 | if (!conn) |
1da177e4 | 4512 | return 0; |
0139418c | 4513 | |
1da177e4 LT |
4514 | BT_DBG("conn %p", conn); |
4515 | ||
160dc6ac VCG |
4516 | if (hcon->type == LE_LINK) { |
4517 | smp_distribute_keys(conn, 0); | |
4518 | del_timer(&conn->security_timer); | |
4519 | } | |
4520 | ||
baa7e1fa | 4521 | read_lock(&conn->chan_lock); |
1da177e4 | 4522 | |
baa7e1fa | 4523 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 4524 | struct sock *sk = chan->sk; |
baa7e1fa | 4525 | |
1da177e4 LT |
4526 | bh_lock_sock(sk); |
4527 | ||
f1cb9af5 VCG |
4528 | BT_DBG("chan->scid %d", chan->scid); |
4529 | ||
4530 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4531 | if (!status && encrypt) { | |
4532 | chan->sec_level = hcon->sec_level; | |
4533 | l2cap_chan_ready(sk); | |
4534 | } | |
4535 | ||
4536 | bh_unlock_sock(sk); | |
4537 | continue; | |
4538 | } | |
4539 | ||
c1360a1c | 4540 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6a8d3010 MH |
4541 | bh_unlock_sock(sk); |
4542 | continue; | |
4543 | } | |
4544 | ||
89bc500e GP |
4545 | if (!status && (chan->state == BT_CONNECTED || |
4546 | chan->state == BT_CONFIG)) { | |
4343478f | 4547 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
4548 | bh_unlock_sock(sk); |
4549 | continue; | |
4550 | } | |
4551 | ||
89bc500e | 4552 | if (chan->state == BT_CONNECT) { |
b1235d79 MH |
4553 | if (!status) { |
4554 | struct l2cap_conn_req req; | |
fe4128e0 GP |
4555 | req.scid = cpu_to_le16(chan->scid); |
4556 | req.psm = chan->psm; | |
1da177e4 | 4557 | |
fc7f8a7e | 4558 | chan->ident = l2cap_get_ident(conn); |
c1360a1c | 4559 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 | 4560 | |
fc7f8a7e | 4561 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
4562 | L2CAP_CONN_REQ, sizeof(req), &req); |
4563 | } else { | |
c9b66675 | 4564 | __clear_chan_timer(chan); |
f3f668b0 | 4565 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 4566 | } |
89bc500e | 4567 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 4568 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4569 | __u16 res, stat; |
1da177e4 | 4570 | |
b1235d79 | 4571 | if (!status) { |
df3c3931 JH |
4572 | if (bt_sk(sk)->defer_setup) { |
4573 | struct sock *parent = bt_sk(sk)->parent; | |
4574 | res = L2CAP_CR_PEND; | |
4575 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4576 | if (parent) |
4577 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4578 | } else { |
05558911 | 4579 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4580 | res = L2CAP_CR_SUCCESS; |
4581 | stat = L2CAP_CS_NO_INFO; | |
4582 | } | |
b1235d79 | 4583 | } else { |
89bc500e | 4584 | l2cap_state_change(chan, BT_DISCONN); |
f3f668b0 | 4585 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
4586 | res = L2CAP_CR_SEC_BLOCK; |
4587 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4588 | } |
4589 | ||
fe4128e0 GP |
4590 | rsp.scid = cpu_to_le16(chan->dcid); |
4591 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4592 | rsp.result = cpu_to_le16(res); |
4593 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4594 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4595 | sizeof(rsp), &rsp); | |
b1235d79 | 4596 | } |
1da177e4 LT |
4597 | |
4598 | bh_unlock_sock(sk); | |
4599 | } | |
4600 | ||
baa7e1fa | 4601 | read_unlock(&conn->chan_lock); |
b1235d79 | 4602 | |
1da177e4 LT |
4603 | return 0; |
4604 | } | |
4605 | ||
4606 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4607 | { | |
4608 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4609 | ||
5a08ecce AE |
4610 | if (!conn) |
4611 | conn = l2cap_conn_add(hcon, 0); | |
4612 | ||
4613 | if (!conn) | |
1da177e4 LT |
4614 | goto drop; |
4615 | ||
4616 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4617 | ||
e702112f | 4618 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4619 | struct l2cap_hdr *hdr; |
48454079 | 4620 | struct l2cap_chan *chan; |
89794813 | 4621 | u16 cid; |
1da177e4 LT |
4622 | int len; |
4623 | ||
4624 | if (conn->rx_len) { | |
4625 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4626 | kfree_skb(conn->rx_skb); | |
4627 | conn->rx_skb = NULL; | |
4628 | conn->rx_len = 0; | |
4629 | l2cap_conn_unreliable(conn, ECOMM); | |
4630 | } | |
4631 | ||
aae7fe22 AE |
4632 | /* Start fragment always begin with Basic L2CAP header */ |
4633 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4634 | BT_ERR("Frame is too short (len %d)", skb->len); |
4635 | l2cap_conn_unreliable(conn, ECOMM); | |
4636 | goto drop; | |
4637 | } | |
4638 | ||
4639 | hdr = (struct l2cap_hdr *) skb->data; | |
4640 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4641 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4642 | |
4643 | if (len == skb->len) { | |
4644 | /* Complete frame received */ | |
4645 | l2cap_recv_frame(conn, skb); | |
4646 | return 0; | |
4647 | } | |
4648 | ||
4649 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4650 | ||
4651 | if (skb->len > len) { | |
4652 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4653 | skb->len, len); | |
4654 | l2cap_conn_unreliable(conn, ECOMM); | |
4655 | goto drop; | |
4656 | } | |
4657 | ||
baa7e1fa | 4658 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4659 | |
48454079 GP |
4660 | if (chan && chan->sk) { |
4661 | struct sock *sk = chan->sk; | |
89794813 | 4662 | |
0c1bc5c6 | 4663 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4664 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4665 | "MTU %d)", len, | |
0c1bc5c6 | 4666 | chan->imtu); |
48454079 GP |
4667 | bh_unlock_sock(sk); |
4668 | l2cap_conn_unreliable(conn, ECOMM); | |
4669 | goto drop; | |
4670 | } | |
89794813 | 4671 | bh_unlock_sock(sk); |
48454079 | 4672 | } |
89794813 | 4673 | |
1da177e4 | 4674 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4675 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4676 | if (!conn->rx_skb) | |
1da177e4 LT |
4677 | goto drop; |
4678 | ||
d626f62b | 4679 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4680 | skb->len); |
1da177e4 LT |
4681 | conn->rx_len = len - skb->len; |
4682 | } else { | |
4683 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4684 | ||
4685 | if (!conn->rx_len) { | |
4686 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4687 | l2cap_conn_unreliable(conn, ECOMM); | |
4688 | goto drop; | |
4689 | } | |
4690 | ||
4691 | if (skb->len > conn->rx_len) { | |
4692 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4693 | skb->len, conn->rx_len); | |
4694 | kfree_skb(conn->rx_skb); | |
4695 | conn->rx_skb = NULL; | |
4696 | conn->rx_len = 0; | |
4697 | l2cap_conn_unreliable(conn, ECOMM); | |
4698 | goto drop; | |
4699 | } | |
4700 | ||
d626f62b | 4701 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4702 | skb->len); |
1da177e4 LT |
4703 | conn->rx_len -= skb->len; |
4704 | ||
4705 | if (!conn->rx_len) { | |
4706 | /* Complete frame received */ | |
4707 | l2cap_recv_frame(conn, conn->rx_skb); | |
4708 | conn->rx_skb = NULL; | |
4709 | } | |
4710 | } | |
4711 | ||
4712 | drop: | |
4713 | kfree_skb(skb); | |
4714 | return 0; | |
4715 | } | |
4716 | ||
aef7d97c | 4717 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 4718 | { |
23691d75 | 4719 | struct l2cap_chan *c; |
1da177e4 | 4720 | |
23691d75 | 4721 | read_lock_bh(&chan_list_lock); |
1da177e4 | 4722 | |
23691d75 GP |
4723 | list_for_each_entry(c, &chan_list, global_l) { |
4724 | struct sock *sk = c->sk; | |
101545f6 | 4725 | |
903d343e | 4726 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4727 | batostr(&bt_sk(sk)->src), |
4728 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 4729 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
4730 | c->scid, c->dcid, c->imtu, c->omtu, |
4731 | c->sec_level, c->mode); | |
05558911 | 4732 | } |
1da177e4 | 4733 | |
23691d75 | 4734 | read_unlock_bh(&chan_list_lock); |
1da177e4 | 4735 | |
aef7d97c | 4736 | return 0; |
1da177e4 LT |
4737 | } |
4738 | ||
aef7d97c MH |
4739 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4740 | { | |
4741 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4742 | } | |
4743 | ||
4744 | static const struct file_operations l2cap_debugfs_fops = { | |
4745 | .open = l2cap_debugfs_open, | |
4746 | .read = seq_read, | |
4747 | .llseek = seq_lseek, | |
4748 | .release = single_release, | |
4749 | }; | |
4750 | ||
4751 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4752 | |
1da177e4 LT |
4753 | static struct hci_proto l2cap_hci_proto = { |
4754 | .name = "L2CAP", | |
4755 | .id = HCI_PROTO_L2CAP, | |
4756 | .connect_ind = l2cap_connect_ind, | |
4757 | .connect_cfm = l2cap_connect_cfm, | |
4758 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4759 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4760 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4761 | .recv_acldata = l2cap_recv_acldata |
4762 | }; | |
4763 | ||
64274518 | 4764 | int __init l2cap_init(void) |
1da177e4 LT |
4765 | { |
4766 | int err; | |
be9d1227 | 4767 | |
bb58f747 | 4768 | err = l2cap_init_sockets(); |
1da177e4 LT |
4769 | if (err < 0) |
4770 | return err; | |
4771 | ||
1da177e4 LT |
4772 | err = hci_register_proto(&l2cap_hci_proto); |
4773 | if (err < 0) { | |
4774 | BT_ERR("L2CAP protocol registration failed"); | |
4775 | bt_sock_unregister(BTPROTO_L2CAP); | |
4776 | goto error; | |
4777 | } | |
4778 | ||
aef7d97c MH |
4779 | if (bt_debugfs) { |
4780 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4781 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4782 | if (!l2cap_debugfs) | |
4783 | BT_ERR("Failed to create L2CAP debug file"); | |
4784 | } | |
1da177e4 | 4785 | |
1da177e4 LT |
4786 | return 0; |
4787 | ||
4788 | error: | |
bb58f747 | 4789 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4790 | return err; |
4791 | } | |
4792 | ||
64274518 | 4793 | void l2cap_exit(void) |
1da177e4 | 4794 | { |
aef7d97c | 4795 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4796 | |
1da177e4 LT |
4797 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4798 | BT_ERR("L2CAP protocol unregistration failed"); | |
4799 | ||
bb58f747 | 4800 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4801 | } |
4802 | ||
d1c4a17d GP |
4803 | module_param(disable_ertm, bool, 0644); |
4804 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |