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. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 39 | #include <net/bluetooth/smp.h> |
97e8e89d | 40 | #include <net/bluetooth/a2mp.h> |
1da177e4 | 41 | |
d1de6d46 | 42 | bool disable_ertm; |
f0709e03 | 43 | |
47ec1dcd | 44 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 45 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 46 | |
b5ad8b7f JB |
47 | static LIST_HEAD(chan_list); |
48 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 49 | |
1da177e4 LT |
50 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
51 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
52 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
53 | void *data); | |
710f9b0a | 54 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a | 55 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
c5daa683 | 56 | struct l2cap_chan *chan, int err); |
1da177e4 | 57 | |
d660366d | 58 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
608bcc6d MM |
59 | struct sk_buff_head *skbs, u8 event); |
60 | ||
0139418c | 61 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 62 | |
baa7e1fa | 63 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 64 | { |
3df91ea2 | 65 | struct l2cap_chan *c; |
3d57dc68 | 66 | |
3df91ea2 AE |
67 | list_for_each_entry(c, &conn->chan_l, list) { |
68 | if (c->dcid == cid) | |
69 | return c; | |
0139418c | 70 | } |
3df91ea2 | 71 | return NULL; |
0139418c MH |
72 | } |
73 | ||
baa7e1fa | 74 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 75 | { |
3df91ea2 | 76 | struct l2cap_chan *c; |
3d57dc68 | 77 | |
3df91ea2 AE |
78 | list_for_each_entry(c, &conn->chan_l, list) { |
79 | if (c->scid == cid) | |
80 | return c; | |
0139418c | 81 | } |
3df91ea2 | 82 | return NULL; |
0139418c MH |
83 | } |
84 | ||
85 | /* Find channel with given SCID. | |
ef191ade | 86 | * Returns locked channel. */ |
baa7e1fa | 87 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 88 | { |
48454079 | 89 | struct l2cap_chan *c; |
baa7e1fa | 90 | |
3df91ea2 | 91 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 92 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
93 | if (c) |
94 | l2cap_chan_lock(c); | |
3df91ea2 AE |
95 | mutex_unlock(&conn->chan_lock); |
96 | ||
48454079 | 97 | return c; |
0139418c MH |
98 | } |
99 | ||
baa7e1fa | 100 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 101 | { |
3df91ea2 | 102 | struct l2cap_chan *c; |
3d57dc68 | 103 | |
3df91ea2 AE |
104 | list_for_each_entry(c, &conn->chan_l, list) { |
105 | if (c->ident == ident) | |
106 | return c; | |
0139418c | 107 | } |
3df91ea2 | 108 | return NULL; |
0139418c MH |
109 | } |
110 | ||
23691d75 | 111 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 112 | { |
23691d75 | 113 | struct l2cap_chan *c; |
9e4425ff | 114 | |
23691d75 GP |
115 | list_for_each_entry(c, &chan_list, global_l) { |
116 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 117 | return c; |
9e4425ff | 118 | } |
250938cb | 119 | return NULL; |
9e4425ff GP |
120 | } |
121 | ||
122 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
123 | { | |
73b2ec18 GP |
124 | int err; |
125 | ||
333055f2 | 126 | write_lock(&chan_list_lock); |
9e4425ff | 127 | |
23691d75 | 128 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
129 | err = -EADDRINUSE; |
130 | goto done; | |
9e4425ff GP |
131 | } |
132 | ||
73b2ec18 GP |
133 | if (psm) { |
134 | chan->psm = psm; | |
135 | chan->sport = psm; | |
136 | err = 0; | |
137 | } else { | |
138 | u16 p; | |
139 | ||
140 | err = -EINVAL; | |
141 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 142 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
143 | chan->psm = cpu_to_le16(p); |
144 | chan->sport = cpu_to_le16(p); | |
145 | err = 0; | |
146 | break; | |
147 | } | |
148 | } | |
9e4425ff | 149 | |
73b2ec18 | 150 | done: |
333055f2 | 151 | write_unlock(&chan_list_lock); |
73b2ec18 | 152 | return err; |
9e4425ff GP |
153 | } |
154 | ||
155 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
156 | { | |
333055f2 | 157 | write_lock(&chan_list_lock); |
9e4425ff GP |
158 | |
159 | chan->scid = scid; | |
160 | ||
333055f2 | 161 | write_unlock(&chan_list_lock); |
9e4425ff GP |
162 | |
163 | return 0; | |
164 | } | |
165 | ||
baa7e1fa | 166 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 167 | { |
8db4dc46 | 168 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 169 | |
8db4dc46 | 170 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 171 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
172 | return cid; |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
0e587be7 | 178 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 179 | { |
42d2d87c | 180 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
181 | state_to_string(state)); |
182 | ||
89bc500e | 183 | chan->state = state; |
80b98027 | 184 | chan->ops->state_change(chan, state); |
89bc500e GP |
185 | } |
186 | ||
0e587be7 AE |
187 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
188 | { | |
189 | struct sock *sk = chan->sk; | |
190 | ||
191 | lock_sock(sk); | |
192 | __l2cap_state_change(chan, state); | |
193 | release_sock(sk); | |
194 | } | |
195 | ||
2e0052e4 AE |
196 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
197 | { | |
198 | struct sock *sk = chan->sk; | |
199 | ||
200 | sk->sk_err = err; | |
201 | } | |
202 | ||
203 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
204 | { | |
205 | struct sock *sk = chan->sk; | |
206 | ||
207 | lock_sock(sk); | |
208 | __l2cap_chan_set_err(chan, err); | |
209 | release_sock(sk); | |
210 | } | |
211 | ||
4239d16f MM |
212 | static void __set_retrans_timer(struct l2cap_chan *chan) |
213 | { | |
214 | if (!delayed_work_pending(&chan->monitor_timer) && | |
215 | chan->retrans_timeout) { | |
216 | l2cap_set_timer(chan, &chan->retrans_timer, | |
217 | msecs_to_jiffies(chan->retrans_timeout)); | |
218 | } | |
219 | } | |
220 | ||
221 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
222 | { | |
223 | __clear_retrans_timer(chan); | |
224 | if (chan->monitor_timeout) { | |
225 | l2cap_set_timer(chan, &chan->monitor_timer, | |
226 | msecs_to_jiffies(chan->monitor_timeout)); | |
227 | } | |
228 | } | |
229 | ||
608bcc6d MM |
230 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
231 | u16 seq) | |
232 | { | |
233 | struct sk_buff *skb; | |
234 | ||
235 | skb_queue_walk(head, skb) { | |
236 | if (bt_cb(skb)->control.txseq == seq) | |
237 | return skb; | |
238 | } | |
239 | ||
240 | return NULL; | |
241 | } | |
242 | ||
3c588192 MM |
243 | /* ---- L2CAP sequence number lists ---- */ |
244 | ||
245 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
246 | * SREJ requests that are received and for frames that are to be | |
247 | * retransmitted. These seq_list functions implement a singly-linked | |
248 | * list in an array, where membership in the list can also be checked | |
249 | * in constant time. Items can also be added to the tail of the list | |
250 | * and removed from the head in constant time, without further memory | |
251 | * allocs or frees. | |
252 | */ | |
253 | ||
254 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
255 | { | |
256 | size_t alloc_size, i; | |
257 | ||
258 | /* Allocated size is a power of 2 to map sequence numbers | |
259 | * (which may be up to 14 bits) in to a smaller array that is | |
260 | * sized for the negotiated ERTM transmit windows. | |
261 | */ | |
262 | alloc_size = roundup_pow_of_two(size); | |
263 | ||
264 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
265 | if (!seq_list->list) | |
266 | return -ENOMEM; | |
267 | ||
268 | seq_list->mask = alloc_size - 1; | |
269 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
270 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
271 | for (i = 0; i < alloc_size; i++) | |
272 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
278 | { | |
279 | kfree(seq_list->list); | |
280 | } | |
281 | ||
282 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
283 | u16 seq) | |
284 | { | |
285 | /* Constant-time check for list membership */ | |
286 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
287 | } | |
288 | ||
289 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
290 | { | |
291 | u16 mask = seq_list->mask; | |
292 | ||
293 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
294 | /* In case someone tries to pop the head of an empty list */ | |
295 | return L2CAP_SEQ_LIST_CLEAR; | |
296 | } else if (seq_list->head == seq) { | |
297 | /* Head can be removed in constant time */ | |
298 | seq_list->head = seq_list->list[seq & mask]; | |
299 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
300 | ||
301 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
302 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
303 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
304 | } | |
305 | } else { | |
306 | /* Walk the list to find the sequence number */ | |
307 | u16 prev = seq_list->head; | |
308 | while (seq_list->list[prev & mask] != seq) { | |
309 | prev = seq_list->list[prev & mask]; | |
310 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
311 | return L2CAP_SEQ_LIST_CLEAR; | |
312 | } | |
313 | ||
314 | /* Unlink the number from the list and clear it */ | |
315 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
316 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
317 | if (seq_list->tail == seq) | |
318 | seq_list->tail = prev; | |
319 | } | |
320 | return seq; | |
321 | } | |
322 | ||
323 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
324 | { | |
325 | /* Remove the head in constant time */ | |
326 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
327 | } | |
328 | ||
329 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
330 | { | |
f522ae36 | 331 | u16 i; |
3c588192 | 332 | |
f522ae36 GP |
333 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
334 | return; | |
335 | ||
336 | for (i = 0; i <= seq_list->mask; i++) | |
337 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
338 | ||
339 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
340 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
341 | } |
342 | ||
343 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
344 | { | |
345 | u16 mask = seq_list->mask; | |
346 | ||
347 | /* All appends happen in constant time */ | |
348 | ||
f522ae36 GP |
349 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
350 | return; | |
3c588192 | 351 | |
f522ae36 GP |
352 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
353 | seq_list->head = seq; | |
354 | else | |
355 | seq_list->list[seq_list->tail & mask] = seq; | |
356 | ||
357 | seq_list->tail = seq; | |
358 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
359 | } |
360 | ||
721c4181 | 361 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 362 | { |
721c4181 GP |
363 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
364 | chan_timer.work); | |
3df91ea2 | 365 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
366 | int reason; |
367 | ||
e05dcc32 | 368 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 369 | |
3df91ea2 | 370 | mutex_lock(&conn->chan_lock); |
6be36555 | 371 | l2cap_chan_lock(chan); |
ab07801d | 372 | |
89bc500e | 373 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 374 | reason = ECONNREFUSED; |
89bc500e | 375 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
376 | chan->sec_level != BT_SECURITY_SDP) |
377 | reason = ECONNREFUSED; | |
378 | else | |
379 | reason = ETIMEDOUT; | |
380 | ||
0f852724 | 381 | l2cap_chan_close(chan, reason); |
ab07801d | 382 | |
6be36555 | 383 | l2cap_chan_unlock(chan); |
ab07801d | 384 | |
80b98027 | 385 | chan->ops->close(chan); |
3df91ea2 AE |
386 | mutex_unlock(&conn->chan_lock); |
387 | ||
371fd835 | 388 | l2cap_chan_put(chan); |
ab07801d GP |
389 | } |
390 | ||
eef1d9b6 | 391 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
392 | { |
393 | struct l2cap_chan *chan; | |
394 | ||
395 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
396 | if (!chan) | |
397 | return NULL; | |
398 | ||
c03b355e AE |
399 | mutex_init(&chan->lock); |
400 | ||
333055f2 | 401 | write_lock(&chan_list_lock); |
23691d75 | 402 | list_add(&chan->global_l, &chan_list); |
333055f2 | 403 | write_unlock(&chan_list_lock); |
23691d75 | 404 | |
721c4181 | 405 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 406 | |
89bc500e GP |
407 | chan->state = BT_OPEN; |
408 | ||
71ba0e56 GP |
409 | atomic_set(&chan->refcnt, 1); |
410 | ||
2827011f MM |
411 | /* This flag is cleared in l2cap_chan_ready() */ |
412 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
413 | ||
eef1d9b6 | 414 | BT_DBG("chan %p", chan); |
abc545b8 | 415 | |
48454079 GP |
416 | return chan; |
417 | } | |
418 | ||
23691d75 | 419 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 420 | { |
333055f2 | 421 | write_lock(&chan_list_lock); |
23691d75 | 422 | list_del(&chan->global_l); |
333055f2 | 423 | write_unlock(&chan_list_lock); |
23691d75 | 424 | |
371fd835 | 425 | l2cap_chan_put(chan); |
6ff5abbf GP |
426 | } |
427 | ||
bd4b1653 AE |
428 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
429 | { | |
430 | chan->fcs = L2CAP_FCS_CRC16; | |
431 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
432 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
433 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
434 | chan->sec_level = BT_SECURITY_LOW; | |
435 | ||
436 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
437 | } | |
438 | ||
14a28491 | 439 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 440 | { |
af05b30b | 441 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 442 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 443 | |
9f5a0d7b | 444 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 445 | |
8c1d787b | 446 | chan->conn = conn; |
0139418c | 447 | |
5491120e AE |
448 | switch (chan->chan_type) { |
449 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
450 | if (conn->hcon->type == LE_LINK) { |
451 | /* LE connection */ | |
6fcb06a2 | 452 | chan->omtu = L2CAP_DEFAULT_MTU; |
fe4128e0 GP |
453 | chan->scid = L2CAP_CID_LE_DATA; |
454 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
455 | } else { |
456 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 457 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 458 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 459 | } |
5491120e AE |
460 | break; |
461 | ||
462 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 463 | /* Connectionless socket */ |
fe4128e0 GP |
464 | chan->scid = L2CAP_CID_CONN_LESS; |
465 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 466 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
467 | break; |
468 | ||
416fa752 AE |
469 | case L2CAP_CHAN_CONN_FIX_A2MP: |
470 | chan->scid = L2CAP_CID_A2MP; | |
471 | chan->dcid = L2CAP_CID_A2MP; | |
472 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
473 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
474 | break; | |
475 | ||
5491120e | 476 | default: |
0139418c | 477 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
478 | chan->scid = L2CAP_CID_SIGNALING; |
479 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 480 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
481 | } |
482 | ||
8f7975b1 AE |
483 | chan->local_id = L2CAP_BESTEFFORT_ID; |
484 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
485 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
486 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
487 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
488 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
489 | ||
371fd835 | 490 | l2cap_chan_hold(chan); |
baa7e1fa | 491 | |
3df91ea2 | 492 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
493 | } |
494 | ||
466f8004 | 495 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
496 | { |
497 | mutex_lock(&conn->chan_lock); | |
498 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 499 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
500 | } |
501 | ||
466f8004 | 502 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 503 | { |
8c1d787b | 504 | struct l2cap_conn *conn = chan->conn; |
0139418c | 505 | |
c9b66675 | 506 | __clear_chan_timer(chan); |
0139418c | 507 | |
49208c9c | 508 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 509 | |
8e87d142 | 510 | if (conn) { |
baa7e1fa | 511 | /* Delete from channel list */ |
3df91ea2 | 512 | list_del(&chan->list); |
3d57dc68 | 513 | |
371fd835 | 514 | l2cap_chan_put(chan); |
baa7e1fa | 515 | |
8c1d787b | 516 | chan->conn = NULL; |
3cabbfda AE |
517 | |
518 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
519 | hci_conn_put(conn->hcon); | |
0139418c MH |
520 | } |
521 | ||
c0df7f6e AE |
522 | if (chan->ops->teardown) |
523 | chan->ops->teardown(chan, err); | |
6be36555 | 524 | |
2827011f | 525 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 526 | return; |
2ead70b8 | 527 | |
ee556f66 GP |
528 | switch(chan->mode) { |
529 | case L2CAP_MODE_BASIC: | |
530 | break; | |
c13ffa62 | 531 | |
ee556f66 | 532 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
533 | __clear_retrans_timer(chan); |
534 | __clear_monitor_timer(chan); | |
535 | __clear_ack_timer(chan); | |
c13ffa62 | 536 | |
f1c6775b | 537 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 538 | |
3c588192 MM |
539 | l2cap_seq_list_free(&chan->srej_list); |
540 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
541 | |
542 | /* fall through */ | |
543 | ||
544 | case L2CAP_MODE_STREAMING: | |
545 | skb_queue_purge(&chan->tx_q); | |
546 | break; | |
c13ffa62 | 547 | } |
ee556f66 GP |
548 | |
549 | return; | |
0139418c MH |
550 | } |
551 | ||
0f852724 | 552 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
553 | { |
554 | struct l2cap_conn *conn = chan->conn; | |
555 | struct sock *sk = chan->sk; | |
556 | ||
e05dcc32 AE |
557 | BT_DBG("chan %p state %s sk %p", chan, |
558 | state_to_string(chan->state), sk); | |
4519de9a | 559 | |
89bc500e | 560 | switch (chan->state) { |
4519de9a | 561 | case BT_LISTEN: |
c0df7f6e AE |
562 | if (chan->ops->teardown) |
563 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
564 | break; |
565 | ||
566 | case BT_CONNECTED: | |
567 | case BT_CONFIG: | |
715ec005 | 568 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 569 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 570 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
571 | l2cap_send_disconn_req(conn, chan, reason); |
572 | } else | |
573 | l2cap_chan_del(chan, reason); | |
574 | break; | |
575 | ||
576 | case BT_CONNECT2: | |
715ec005 | 577 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
578 | conn->hcon->type == ACL_LINK) { |
579 | struct l2cap_conn_rsp rsp; | |
580 | __u16 result; | |
581 | ||
c5daa683 | 582 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
583 | result = L2CAP_CR_SEC_BLOCK; |
584 | else | |
585 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 586 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
587 | |
588 | rsp.scid = cpu_to_le16(chan->dcid); | |
589 | rsp.dcid = cpu_to_le16(chan->scid); | |
590 | rsp.result = cpu_to_le16(result); | |
ac73498c | 591 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a GP |
592 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
593 | sizeof(rsp), &rsp); | |
594 | } | |
595 | ||
596 | l2cap_chan_del(chan, reason); | |
597 | break; | |
598 | ||
599 | case BT_CONNECT: | |
600 | case BT_DISCONN: | |
601 | l2cap_chan_del(chan, reason); | |
602 | break; | |
603 | ||
604 | default: | |
c0df7f6e AE |
605 | if (chan->ops->teardown) |
606 | chan->ops->teardown(chan, 0); | |
4519de9a GP |
607 | break; |
608 | } | |
609 | } | |
610 | ||
4343478f | 611 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 612 | { |
715ec005 | 613 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 614 | switch (chan->sec_level) { |
8556edd3 JH |
615 | case BT_SECURITY_HIGH: |
616 | return HCI_AT_DEDICATED_BONDING_MITM; | |
617 | case BT_SECURITY_MEDIUM: | |
618 | return HCI_AT_DEDICATED_BONDING; | |
619 | default: | |
620 | return HCI_AT_NO_BONDING; | |
621 | } | |
2983fd68 | 622 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
623 | if (chan->sec_level == BT_SECURITY_LOW) |
624 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 625 | |
4343478f | 626 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 627 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 628 | else |
8556edd3 | 629 | return HCI_AT_NO_BONDING; |
00ae4af9 | 630 | } else { |
4343478f | 631 | switch (chan->sec_level) { |
00ae4af9 | 632 | case BT_SECURITY_HIGH: |
8556edd3 | 633 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 634 | case BT_SECURITY_MEDIUM: |
8556edd3 | 635 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 636 | default: |
8556edd3 | 637 | return HCI_AT_NO_BONDING; |
00ae4af9 | 638 | } |
0684e5f9 | 639 | } |
8556edd3 JH |
640 | } |
641 | ||
642 | /* Service level security */ | |
d45fc423 | 643 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 644 | { |
8c1d787b | 645 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
646 | __u8 auth_type; |
647 | ||
4343478f | 648 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 649 | |
4343478f | 650 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
651 | } |
652 | ||
b5ad8b7f | 653 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
654 | { |
655 | u8 id; | |
656 | ||
657 | /* Get next available identificator. | |
658 | * 1 - 128 are used by kernel. | |
659 | * 129 - 199 are reserved. | |
660 | * 200 - 254 are used by utilities like l2ping, etc. | |
661 | */ | |
662 | ||
333055f2 | 663 | spin_lock(&conn->lock); |
4e8402a3 MH |
664 | |
665 | if (++conn->tx_ident > 128) | |
666 | conn->tx_ident = 1; | |
667 | ||
668 | id = conn->tx_ident; | |
669 | ||
333055f2 | 670 | spin_unlock(&conn->lock); |
4e8402a3 MH |
671 | |
672 | return id; | |
673 | } | |
674 | ||
4519de9a | 675 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
676 | { |
677 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 678 | u8 flags; |
4e8402a3 MH |
679 | |
680 | BT_DBG("code 0x%2.2x", code); | |
681 | ||
682 | if (!skb) | |
9a9c6a34 | 683 | return; |
4e8402a3 | 684 | |
e702112f AE |
685 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
686 | flags = ACL_START_NO_FLUSH; | |
687 | else | |
688 | flags = ACL_START; | |
689 | ||
14b12d0b | 690 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 691 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 692 | |
73d80deb LAD |
693 | hci_send_acl(conn->hchan, skb, flags); |
694 | } | |
695 | ||
696 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
697 | { | |
698 | struct hci_conn *hcon = chan->conn->hcon; | |
699 | u16 flags; | |
700 | ||
701 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
702 | skb->priority); | |
703 | ||
704 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
705 | lmp_no_flush_capable(hcon->hdev)) | |
706 | flags = ACL_START_NO_FLUSH; | |
707 | else | |
708 | flags = ACL_START; | |
14b12d0b | 709 | |
73d80deb LAD |
710 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
711 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
712 | } |
713 | ||
b76bbd66 MM |
714 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
715 | { | |
716 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
717 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
718 | ||
719 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
720 | /* S-Frame */ | |
721 | control->sframe = 1; | |
722 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
723 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
724 | ||
725 | control->sar = 0; | |
726 | control->txseq = 0; | |
727 | } else { | |
728 | /* I-Frame */ | |
729 | control->sframe = 0; | |
730 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
731 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
732 | ||
733 | control->poll = 0; | |
734 | control->super = 0; | |
735 | } | |
736 | } | |
737 | ||
b76bbd66 MM |
738 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
739 | { | |
740 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
741 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
742 | ||
743 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
744 | /* S-Frame */ | |
745 | control->sframe = 1; | |
746 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
747 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
748 | ||
749 | control->sar = 0; | |
750 | control->txseq = 0; | |
751 | } else { | |
752 | /* I-Frame */ | |
753 | control->sframe = 0; | |
754 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
755 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
756 | ||
757 | control->poll = 0; | |
758 | control->super = 0; | |
759 | } | |
760 | } | |
761 | ||
762 | static inline void __unpack_control(struct l2cap_chan *chan, | |
763 | struct sk_buff *skb) | |
764 | { | |
765 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
766 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
767 | &bt_cb(skb)->control); | |
cec8ab6e | 768 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
769 | } else { |
770 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
771 | &bt_cb(skb)->control); | |
cec8ab6e | 772 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
773 | } |
774 | } | |
775 | ||
b5c6aaed MM |
776 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
777 | { | |
778 | u32 packed; | |
779 | ||
780 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
781 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
782 | ||
783 | if (control->sframe) { | |
784 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
785 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
786 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
787 | } else { | |
788 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
789 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
790 | } | |
791 | ||
792 | return packed; | |
793 | } | |
794 | ||
795 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
796 | { | |
797 | u16 packed; | |
798 | ||
799 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
800 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
801 | ||
802 | if (control->sframe) { | |
803 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
804 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
805 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
806 | } else { | |
807 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
808 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
809 | } | |
810 | ||
811 | return packed; | |
812 | } | |
813 | ||
b76bbd66 MM |
814 | static inline void __pack_control(struct l2cap_chan *chan, |
815 | struct l2cap_ctrl *control, | |
816 | struct sk_buff *skb) | |
817 | { | |
818 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
819 | put_unaligned_le32(__pack_extended_control(control), | |
820 | skb->data + L2CAP_HDR_SIZE); | |
821 | } else { | |
822 | put_unaligned_le16(__pack_enhanced_control(control), | |
823 | skb->data + L2CAP_HDR_SIZE); | |
824 | } | |
825 | } | |
826 | ||
ba7aa64f GP |
827 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
828 | { | |
829 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
830 | return L2CAP_EXT_HDR_SIZE; | |
831 | else | |
832 | return L2CAP_ENH_HDR_SIZE; | |
833 | } | |
834 | ||
a67d7f6f MM |
835 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
836 | u32 control) | |
b5c6aaed MM |
837 | { |
838 | struct sk_buff *skb; | |
839 | struct l2cap_hdr *lh; | |
ba7aa64f | 840 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
841 | |
842 | if (chan->fcs == L2CAP_FCS_CRC16) | |
843 | hlen += L2CAP_FCS_SIZE; | |
844 | ||
a67d7f6f | 845 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 846 | |
b5c6aaed | 847 | if (!skb) |
a67d7f6f | 848 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
849 | |
850 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
851 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
852 | lh->cid = cpu_to_le16(chan->dcid); | |
853 | ||
a67d7f6f MM |
854 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
855 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
856 | else | |
857 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
858 | |
859 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 860 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
861 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
862 | } | |
863 | ||
864 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
865 | return skb; |
866 | } | |
867 | ||
868 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
869 | struct l2cap_ctrl *control) | |
870 | { | |
871 | struct sk_buff *skb; | |
872 | u32 control_field; | |
873 | ||
874 | BT_DBG("chan %p, control %p", chan, control); | |
875 | ||
876 | if (!control->sframe) | |
877 | return; | |
878 | ||
879 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
880 | !control->poll) | |
881 | control->final = 1; | |
882 | ||
883 | if (control->super == L2CAP_SUPER_RR) | |
884 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
885 | else if (control->super == L2CAP_SUPER_RNR) | |
886 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
887 | ||
888 | if (control->super != L2CAP_SUPER_SREJ) { | |
889 | chan->last_acked_seq = control->reqseq; | |
890 | __clear_ack_timer(chan); | |
891 | } | |
892 | ||
893 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
894 | control->final, control->poll, control->super); | |
895 | ||
896 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
897 | control_field = __pack_extended_control(control); | |
898 | else | |
899 | control_field = __pack_enhanced_control(control); | |
900 | ||
901 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
902 | if (!IS_ERR(skb)) | |
903 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
904 | } |
905 | ||
c9e3d5e0 | 906 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 907 | { |
c9e3d5e0 MM |
908 | struct l2cap_ctrl control; |
909 | ||
910 | BT_DBG("chan %p, poll %d", chan, poll); | |
911 | ||
912 | memset(&control, 0, sizeof(control)); | |
913 | control.sframe = 1; | |
914 | control.poll = poll; | |
915 | ||
916 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
917 | control.super = L2CAP_SUPER_RNR; | |
918 | else | |
919 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 920 | |
c9e3d5e0 MM |
921 | control.reqseq = chan->buffer_seq; |
922 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
923 | } |
924 | ||
b4450035 | 925 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 926 | { |
c1360a1c | 927 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
928 | } |
929 | ||
9b27f350 AE |
930 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
931 | { | |
932 | struct l2cap_conn *conn = chan->conn; | |
933 | struct l2cap_conn_req req; | |
934 | ||
935 | req.scid = cpu_to_le16(chan->scid); | |
936 | req.psm = chan->psm; | |
937 | ||
938 | chan->ident = l2cap_get_ident(conn); | |
939 | ||
940 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
941 | ||
942 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
943 | } | |
944 | ||
9f0caeb1 VCG |
945 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
946 | { | |
2827011f | 947 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
948 | chan->conf_state = 0; |
949 | __clear_chan_timer(chan); | |
950 | ||
54a59aa2 | 951 | chan->state = BT_CONNECTED; |
9f0caeb1 | 952 | |
fd83e2c2 | 953 | chan->ops->ready(chan); |
9f0caeb1 VCG |
954 | } |
955 | ||
fc7f8a7e | 956 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 957 | { |
8c1d787b | 958 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 959 | |
9f0caeb1 VCG |
960 | if (conn->hcon->type == LE_LINK) { |
961 | l2cap_chan_ready(chan); | |
962 | return; | |
963 | } | |
964 | ||
79d554a6 | 965 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
966 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
967 | return; | |
968 | ||
d45fc423 | 969 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
970 | __l2cap_no_conn_pending(chan)) |
971 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
972 | } else { |
973 | struct l2cap_info_req req; | |
ac73498c | 974 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
975 | |
976 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
977 | conn->info_ident = l2cap_get_ident(conn); | |
978 | ||
ba13ccd9 | 979 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
980 | |
981 | l2cap_send_cmd(conn, conn->info_ident, | |
982 | L2CAP_INFO_REQ, sizeof(req), &req); | |
983 | } | |
984 | } | |
985 | ||
cf6c2c0b GP |
986 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
987 | { | |
988 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 989 | if (!disable_ertm) |
cf6c2c0b GP |
990 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
991 | ||
992 | switch (mode) { | |
993 | case L2CAP_MODE_ERTM: | |
994 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
995 | case L2CAP_MODE_STREAMING: | |
996 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
997 | default: | |
998 | return 0x00; | |
999 | } | |
1000 | } | |
1001 | ||
4519de9a | 1002 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 1003 | { |
6be36555 | 1004 | struct sock *sk = chan->sk; |
22121fc9 GP |
1005 | struct l2cap_disconn_req req; |
1006 | ||
c13ffa62 GP |
1007 | if (!conn) |
1008 | return; | |
1009 | ||
0c1bc5c6 | 1010 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
1011 | __clear_retrans_timer(chan); |
1012 | __clear_monitor_timer(chan); | |
1013 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1014 | } |
1015 | ||
416fa752 AE |
1016 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1017 | __l2cap_state_change(chan, BT_DISCONN); | |
1018 | return; | |
1019 | } | |
1020 | ||
fe4128e0 GP |
1021 | req.dcid = cpu_to_le16(chan->dcid); |
1022 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
1023 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1024 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1025 | |
6be36555 | 1026 | lock_sock(sk); |
0e587be7 | 1027 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1028 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1029 | release_sock(sk); |
22121fc9 GP |
1030 | } |
1031 | ||
1da177e4 | 1032 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1033 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1034 | { | |
3df91ea2 | 1035 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1036 | |
1037 | BT_DBG("conn %p", conn); | |
1038 | ||
3df91ea2 | 1039 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1040 | |
3df91ea2 | 1041 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1042 | struct sock *sk = chan->sk; |
baa7e1fa | 1043 | |
6be36555 | 1044 | l2cap_chan_lock(chan); |
4e8402a3 | 1045 | |
715ec005 | 1046 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1047 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1048 | continue; |
1049 | } | |
1050 | ||
89bc500e | 1051 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1052 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1053 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1054 | l2cap_chan_unlock(chan); |
47731de7 GP |
1055 | continue; |
1056 | } | |
79d554a6 | 1057 | |
c1360a1c GP |
1058 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1059 | && test_bit(CONF_STATE2_DEVICE, | |
1060 | &chan->conf_state)) { | |
89bc500e | 1061 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1062 | l2cap_chan_unlock(chan); |
47731de7 | 1063 | continue; |
b1235d79 | 1064 | } |
47731de7 | 1065 | |
9b27f350 | 1066 | l2cap_send_conn_req(chan); |
47731de7 | 1067 | |
89bc500e | 1068 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1069 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1070 | char buf[128]; |
fe4128e0 GP |
1071 | rsp.scid = cpu_to_le16(chan->dcid); |
1072 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1073 | |
d45fc423 | 1074 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1075 | lock_sock(sk); |
c5daa683 GP |
1076 | if (test_bit(BT_SK_DEFER_SETUP, |
1077 | &bt_sk(sk)->flags)) { | |
f66dc81f | 1078 | struct sock *parent = bt_sk(sk)->parent; |
ac73498c AE |
1079 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1080 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1081 | if (parent) |
1082 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1083 | |
1084 | } else { | |
0e587be7 | 1085 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1086 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1087 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1088 | } |
6be36555 | 1089 | release_sock(sk); |
79d554a6 | 1090 | } else { |
ac73498c AE |
1091 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1092 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1093 | } |
1094 | ||
fc7f8a7e GP |
1095 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1096 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1097 | |
c1360a1c | 1098 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1099 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1100 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1101 | continue; |
1102 | } | |
1103 | ||
c1360a1c | 1104 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1105 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1106 | l2cap_build_conf_req(chan, buf), buf); |
1107 | chan->num_conf_req++; | |
4e8402a3 MH |
1108 | } |
1109 | ||
6be36555 | 1110 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1111 | } |
1112 | ||
3df91ea2 | 1113 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1114 | } |
1115 | ||
c2287681 | 1116 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1117 | * Returns closest match, locked. |
1118 | */ | |
d9b88702 | 1119 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1120 | bdaddr_t *src, |
1121 | bdaddr_t *dst) | |
b62f328b | 1122 | { |
23691d75 | 1123 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1124 | |
23691d75 | 1125 | read_lock(&chan_list_lock); |
b62f328b | 1126 | |
23691d75 GP |
1127 | list_for_each_entry(c, &chan_list, global_l) { |
1128 | struct sock *sk = c->sk; | |
fe4128e0 | 1129 | |
89bc500e | 1130 | if (state && c->state != state) |
b62f328b VT |
1131 | continue; |
1132 | ||
23691d75 | 1133 | if (c->scid == cid) { |
c2287681 IY |
1134 | int src_match, dst_match; |
1135 | int src_any, dst_any; | |
1136 | ||
b62f328b | 1137 | /* Exact match. */ |
c2287681 IY |
1138 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1139 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1140 | if (src_match && dst_match) { | |
23691d75 GP |
1141 | read_unlock(&chan_list_lock); |
1142 | return c; | |
1143 | } | |
b62f328b VT |
1144 | |
1145 | /* Closest match */ | |
c2287681 IY |
1146 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1147 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1148 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1149 | (src_any && dst_any)) | |
23691d75 | 1150 | c1 = c; |
b62f328b VT |
1151 | } |
1152 | } | |
280f294f | 1153 | |
23691d75 | 1154 | read_unlock(&chan_list_lock); |
b62f328b | 1155 | |
23691d75 | 1156 | return c1; |
b62f328b VT |
1157 | } |
1158 | ||
1159 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1160 | { | |
c916fbe4 | 1161 | struct sock *parent, *sk; |
23691d75 | 1162 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1163 | |
1164 | BT_DBG(""); | |
1165 | ||
1166 | /* Check if we have socket listening on cid */ | |
23691d75 | 1167 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1168 | conn->src, conn->dst); |
23691d75 | 1169 | if (!pchan) |
b62f328b VT |
1170 | return; |
1171 | ||
23691d75 GP |
1172 | parent = pchan->sk; |
1173 | ||
aa2ac881 | 1174 | lock_sock(parent); |
62f3a2cf | 1175 | |
80b98027 | 1176 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1177 | if (!chan) |
b62f328b VT |
1178 | goto clean; |
1179 | ||
80808e43 | 1180 | sk = chan->sk; |
5d41ce1d | 1181 | |
b62f328b VT |
1182 | hci_conn_hold(conn->hcon); |
1183 | ||
b62f328b VT |
1184 | bacpy(&bt_sk(sk)->src, conn->src); |
1185 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1186 | ||
d1010240 GP |
1187 | bt_accept_enqueue(parent, sk); |
1188 | ||
3d57dc68 | 1189 | l2cap_chan_add(conn, chan); |
48454079 | 1190 | |
6754e0df | 1191 | l2cap_chan_ready(chan); |
b62f328b | 1192 | |
b62f328b | 1193 | clean: |
aa2ac881 | 1194 | release_sock(parent); |
b62f328b VT |
1195 | } |
1196 | ||
4e8402a3 MH |
1197 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1198 | { | |
48454079 | 1199 | struct l2cap_chan *chan; |
4e8402a3 | 1200 | |
79d554a6 | 1201 | BT_DBG("conn %p", conn); |
4e8402a3 | 1202 | |
b62f328b VT |
1203 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1204 | l2cap_le_conn_ready(conn); | |
1205 | ||
160dc6ac VCG |
1206 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1207 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1208 | ||
3df91ea2 | 1209 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1210 | |
3df91ea2 | 1211 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1212 | |
6be36555 | 1213 | l2cap_chan_lock(chan); |
4e8402a3 | 1214 | |
416fa752 AE |
1215 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1216 | l2cap_chan_unlock(chan); | |
1217 | continue; | |
1218 | } | |
1219 | ||
63128451 | 1220 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1221 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1222 | l2cap_chan_ready(chan); |
acd7d370 | 1223 | |
63128451 | 1224 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1225 | struct sock *sk = chan->sk; |
c9b66675 | 1226 | __clear_chan_timer(chan); |
6be36555 | 1227 | lock_sock(sk); |
0e587be7 | 1228 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1229 | sk->sk_state_change(sk); |
6be36555 | 1230 | release_sock(sk); |
b501d6a1 | 1231 | |
89bc500e | 1232 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1233 | l2cap_do_start(chan); |
4e8402a3 | 1234 | |
6be36555 | 1235 | l2cap_chan_unlock(chan); |
4e8402a3 | 1236 | } |
79d554a6 | 1237 | |
3df91ea2 | 1238 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1239 | } |
1240 | ||
1241 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1242 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1243 | { | |
48454079 | 1244 | struct l2cap_chan *chan; |
4e8402a3 MH |
1245 | |
1246 | BT_DBG("conn %p", conn); | |
1247 | ||
3df91ea2 | 1248 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1249 | |
3df91ea2 | 1250 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1251 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1252 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1253 | } |
1254 | ||
3df91ea2 | 1255 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1256 | } |
1257 | ||
f878fcad | 1258 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1259 | { |
f878fcad | 1260 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1261 | info_timer.work); |
4e8402a3 | 1262 | |
984947dc | 1263 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1264 | conn->info_ident = 0; |
984947dc | 1265 | |
4e8402a3 MH |
1266 | l2cap_conn_start(conn); |
1267 | } | |
1268 | ||
5d3de7df VCG |
1269 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1270 | { | |
1271 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1272 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1273 | |
1274 | if (!conn) | |
1275 | return; | |
1276 | ||
1277 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1278 | ||
1279 | kfree_skb(conn->rx_skb); | |
1280 | ||
3df91ea2 AE |
1281 | mutex_lock(&conn->chan_lock); |
1282 | ||
5d3de7df VCG |
1283 | /* Kill channels */ |
1284 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1285 | l2cap_chan_hold(chan); |
6be36555 AE |
1286 | l2cap_chan_lock(chan); |
1287 | ||
5d3de7df | 1288 | l2cap_chan_del(chan, err); |
6be36555 AE |
1289 | |
1290 | l2cap_chan_unlock(chan); | |
1291 | ||
80b98027 | 1292 | chan->ops->close(chan); |
61d6ef3e | 1293 | l2cap_chan_put(chan); |
5d3de7df VCG |
1294 | } |
1295 | ||
3df91ea2 AE |
1296 | mutex_unlock(&conn->chan_lock); |
1297 | ||
73d80deb LAD |
1298 | hci_chan_del(conn->hchan); |
1299 | ||
5d3de7df | 1300 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1301 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1302 | |
51a8efd7 | 1303 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1304 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1305 | smp_chan_destroy(conn); |
d26a2345 | 1306 | } |
5d3de7df VCG |
1307 | |
1308 | hcon->l2cap_data = NULL; | |
1309 | kfree(conn); | |
1310 | } | |
1311 | ||
6c9d42a1 | 1312 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1313 | { |
6c9d42a1 GP |
1314 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1315 | security_timer.work); | |
5d3de7df | 1316 | |
d06cc416 JH |
1317 | BT_DBG("conn %p", conn); |
1318 | ||
1319 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1320 | smp_chan_destroy(conn); | |
1321 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1322 | } | |
5d3de7df VCG |
1323 | } |
1324 | ||
1da177e4 LT |
1325 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1326 | { | |
0139418c | 1327 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1328 | struct hci_chan *hchan; |
1da177e4 | 1329 | |
0139418c | 1330 | if (conn || status) |
1da177e4 LT |
1331 | return conn; |
1332 | ||
73d80deb LAD |
1333 | hchan = hci_chan_create(hcon); |
1334 | if (!hchan) | |
1335 | return NULL; | |
1336 | ||
0139418c | 1337 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1338 | if (!conn) { |
1339 | hci_chan_del(hchan); | |
1da177e4 | 1340 | return NULL; |
73d80deb | 1341 | } |
1da177e4 LT |
1342 | |
1343 | hcon->l2cap_data = conn; | |
1344 | conn->hcon = hcon; | |
73d80deb | 1345 | conn->hchan = hchan; |
1da177e4 | 1346 | |
73d80deb | 1347 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1348 | |
acd7d370 VT |
1349 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1350 | conn->mtu = hcon->hdev->le_mtu; | |
1351 | else | |
1352 | conn->mtu = hcon->hdev->acl_mtu; | |
1353 | ||
1da177e4 LT |
1354 | conn->src = &hcon->hdev->bdaddr; |
1355 | conn->dst = &hcon->dst; | |
1356 | ||
4e8402a3 MH |
1357 | conn->feat_mask = 0; |
1358 | ||
1da177e4 | 1359 | spin_lock_init(&conn->lock); |
3df91ea2 | 1360 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1361 | |
1362 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1363 | |
5d3de7df | 1364 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1365 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1366 | else |
030013d8 | 1367 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1368 | |
9f5a0d7b | 1369 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1370 | |
1da177e4 LT |
1371 | return conn; |
1372 | } | |
1373 | ||
1da177e4 | 1374 | /* ---- Socket interface ---- */ |
1da177e4 | 1375 | |
c2287681 | 1376 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1377 | * Returns closest match. |
1378 | */ | |
c2287681 IY |
1379 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1380 | bdaddr_t *src, | |
1381 | bdaddr_t *dst) | |
1da177e4 | 1382 | { |
23691d75 | 1383 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1384 | |
23691d75 | 1385 | read_lock(&chan_list_lock); |
e0f0cb56 | 1386 | |
23691d75 GP |
1387 | list_for_each_entry(c, &chan_list, global_l) { |
1388 | struct sock *sk = c->sk; | |
fe4128e0 | 1389 | |
89bc500e | 1390 | if (state && c->state != state) |
1da177e4 LT |
1391 | continue; |
1392 | ||
23691d75 | 1393 | if (c->psm == psm) { |
c2287681 IY |
1394 | int src_match, dst_match; |
1395 | int src_any, dst_any; | |
1396 | ||
1da177e4 | 1397 | /* Exact match. */ |
c2287681 IY |
1398 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1399 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1400 | if (src_match && dst_match) { | |
a7567b20 | 1401 | read_unlock(&chan_list_lock); |
23691d75 GP |
1402 | return c; |
1403 | } | |
1da177e4 LT |
1404 | |
1405 | /* Closest match */ | |
c2287681 IY |
1406 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1407 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1408 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1409 | (src_any && dst_any)) | |
23691d75 | 1410 | c1 = c; |
1da177e4 LT |
1411 | } |
1412 | } | |
1da177e4 | 1413 | |
23691d75 | 1414 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1415 | |
23691d75 | 1416 | return c1; |
1da177e4 LT |
1417 | } |
1418 | ||
8e9f9892 AG |
1419 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1420 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1421 | { |
5d41ce1d | 1422 | struct sock *sk = chan->sk; |
1da177e4 | 1423 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1424 | struct l2cap_conn *conn; |
1425 | struct hci_conn *hcon; | |
1426 | struct hci_dev *hdev; | |
09ab6f4c | 1427 | __u8 auth_type; |
44d0e48e | 1428 | int err; |
1da177e4 | 1429 | |
8e9f9892 AG |
1430 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1431 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1432 | |
af05b30b GP |
1433 | hdev = hci_get_route(dst, src); |
1434 | if (!hdev) | |
1da177e4 LT |
1435 | return -EHOSTUNREACH; |
1436 | ||
09fd0de5 | 1437 | hci_dev_lock(hdev); |
1da177e4 | 1438 | |
6be36555 | 1439 | l2cap_chan_lock(chan); |
03a00194 GP |
1440 | |
1441 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1442 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1443 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1444 | err = -EINVAL; | |
1445 | goto done; | |
1446 | } | |
1447 | ||
1448 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1449 | err = -EINVAL; | |
1450 | goto done; | |
1451 | } | |
1452 | ||
1453 | switch (chan->mode) { | |
1454 | case L2CAP_MODE_BASIC: | |
1455 | break; | |
1456 | case L2CAP_MODE_ERTM: | |
1457 | case L2CAP_MODE_STREAMING: | |
1458 | if (!disable_ertm) | |
1459 | break; | |
1460 | /* fall through */ | |
1461 | default: | |
1462 | err = -ENOTSUPP; | |
1463 | goto done; | |
1464 | } | |
1465 | ||
0797e01d | 1466 | switch (chan->state) { |
03a00194 GP |
1467 | case BT_CONNECT: |
1468 | case BT_CONNECT2: | |
1469 | case BT_CONFIG: | |
1470 | /* Already connecting */ | |
1471 | err = 0; | |
1472 | goto done; | |
1473 | ||
1474 | case BT_CONNECTED: | |
1475 | /* Already connected */ | |
1476 | err = -EISCONN; | |
1477 | goto done; | |
1478 | ||
1479 | case BT_OPEN: | |
1480 | case BT_BOUND: | |
1481 | /* Can connect */ | |
1482 | break; | |
1483 | ||
1484 | default: | |
1485 | err = -EBADFD; | |
1486 | goto done; | |
1487 | } | |
1488 | ||
1489 | /* Set destination address and psm */ | |
0797e01d | 1490 | lock_sock(sk); |
9219b2a0 | 1491 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1492 | release_sock(sk); |
1493 | ||
03a00194 GP |
1494 | chan->psm = psm; |
1495 | chan->dcid = cid; | |
1da177e4 | 1496 | |
4343478f | 1497 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1498 | |
fe4128e0 | 1499 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1500 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1501 | chan->sec_level, auth_type); |
acd7d370 | 1502 | else |
8e9f9892 | 1503 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1504 | chan->sec_level, auth_type); |
acd7d370 | 1505 | |
30e76272 VT |
1506 | if (IS_ERR(hcon)) { |
1507 | err = PTR_ERR(hcon); | |
1da177e4 | 1508 | goto done; |
30e76272 | 1509 | } |
1da177e4 LT |
1510 | |
1511 | conn = l2cap_conn_add(hcon, 0); | |
1512 | if (!conn) { | |
1513 | hci_conn_put(hcon); | |
30e76272 | 1514 | err = -ENOMEM; |
1da177e4 LT |
1515 | goto done; |
1516 | } | |
1517 | ||
9f0caeb1 VCG |
1518 | if (hcon->type == LE_LINK) { |
1519 | err = 0; | |
1520 | ||
1521 | if (!list_empty(&conn->chan_l)) { | |
1522 | err = -EBUSY; | |
1523 | hci_conn_put(hcon); | |
1524 | } | |
1525 | ||
1526 | if (err) | |
1527 | goto done; | |
1528 | } | |
1529 | ||
1da177e4 LT |
1530 | /* Update source addr of the socket */ |
1531 | bacpy(src, conn->src); | |
1532 | ||
6be36555 | 1533 | l2cap_chan_unlock(chan); |
48454079 | 1534 | l2cap_chan_add(conn, chan); |
6be36555 | 1535 | l2cap_chan_lock(chan); |
48454079 | 1536 | |
6be36555 | 1537 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1538 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1539 | |
1540 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1541 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1542 | __clear_chan_timer(chan); |
d45fc423 | 1543 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1544 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1545 | } else |
fc7f8a7e | 1546 | l2cap_do_start(chan); |
1da177e4 LT |
1547 | } |
1548 | ||
30e76272 VT |
1549 | err = 0; |
1550 | ||
1da177e4 | 1551 | done: |
6be36555 | 1552 | l2cap_chan_unlock(chan); |
09fd0de5 | 1553 | hci_dev_unlock(hdev); |
1da177e4 LT |
1554 | hci_dev_put(hdev); |
1555 | return err; | |
1556 | } | |
1557 | ||
dcba0dba | 1558 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1559 | { |
8c1d787b | 1560 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1561 | DECLARE_WAITQUEUE(wait, current); |
1562 | int err = 0; | |
1563 | int timeo = HZ/5; | |
1564 | ||
2b0b05dd | 1565 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1566 | set_current_state(TASK_INTERRUPTIBLE); |
1567 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1568 | if (!timeo) |
1569 | timeo = HZ/5; | |
1570 | ||
1571 | if (signal_pending(current)) { | |
1572 | err = sock_intr_errno(timeo); | |
1573 | break; | |
1574 | } | |
1575 | ||
1576 | release_sock(sk); | |
1577 | timeo = schedule_timeout(timeo); | |
1578 | lock_sock(sk); | |
a71a0cf4 | 1579 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1580 | |
1581 | err = sock_error(sk); | |
1582 | if (err) | |
1583 | break; | |
1584 | } | |
1585 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1586 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1587 | return err; |
1588 | } | |
1589 | ||
721c4181 | 1590 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1591 | { |
721c4181 | 1592 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1593 | monitor_timer.work); |
e90bac06 | 1594 | |
525cd185 | 1595 | BT_DBG("chan %p", chan); |
0e98958d | 1596 | |
6be36555 AE |
1597 | l2cap_chan_lock(chan); |
1598 | ||
80909e04 | 1599 | if (!chan->conn) { |
6be36555 | 1600 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1601 | l2cap_chan_put(chan); |
e90bac06 GP |
1602 | return; |
1603 | } | |
1604 | ||
401bb1f7 | 1605 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1606 | |
6be36555 | 1607 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1608 | l2cap_chan_put(chan); |
e90bac06 GP |
1609 | } |
1610 | ||
721c4181 | 1611 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1612 | { |
721c4181 | 1613 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1614 | retrans_timer.work); |
e90bac06 | 1615 | |
49208c9c | 1616 | BT_DBG("chan %p", chan); |
0e98958d | 1617 | |
6be36555 AE |
1618 | l2cap_chan_lock(chan); |
1619 | ||
80909e04 MM |
1620 | if (!chan->conn) { |
1621 | l2cap_chan_unlock(chan); | |
1622 | l2cap_chan_put(chan); | |
1623 | return; | |
1624 | } | |
6be36555 | 1625 | |
401bb1f7 | 1626 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1627 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1628 | l2cap_chan_put(chan); |
e90bac06 GP |
1629 | } |
1630 | ||
d660366d GP |
1631 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1632 | struct sk_buff_head *skbs) | |
6840ed07 | 1633 | { |
ccbb84af | 1634 | struct sk_buff *skb; |
3733937d | 1635 | struct l2cap_ctrl *control; |
6840ed07 | 1636 | |
3733937d MM |
1637 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1638 | ||
3733937d MM |
1639 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1640 | ||
1641 | while (!skb_queue_empty(&chan->tx_q)) { | |
1642 | ||
1643 | skb = skb_dequeue(&chan->tx_q); | |
1644 | ||
1645 | bt_cb(skb)->control.retries = 1; | |
1646 | control = &bt_cb(skb)->control; | |
1647 | ||
1648 | control->reqseq = 0; | |
1649 | control->txseq = chan->next_tx_seq; | |
1650 | ||
1651 | __pack_control(chan, control, skb); | |
6840ed07 | 1652 | |
47d1ec61 | 1653 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1654 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1655 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1656 | } |
1657 | ||
4343478f | 1658 | l2cap_do_send(chan, skb); |
6840ed07 | 1659 | |
b4400672 | 1660 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1661 | |
836be934 | 1662 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1663 | chan->frames_sent++; |
6840ed07 | 1664 | } |
6840ed07 GP |
1665 | } |
1666 | ||
67c9e840 | 1667 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1668 | { |
1669 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1670 | struct l2cap_ctrl *control; |
1671 | int sent = 0; | |
1672 | ||
1673 | BT_DBG("chan %p", chan); | |
1c2acffb | 1674 | |
89bc500e | 1675 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1676 | return -ENOTCONN; |
e90bac06 | 1677 | |
94122bbe MM |
1678 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1679 | return 0; | |
1680 | ||
18a48e76 MM |
1681 | while (chan->tx_send_head && |
1682 | chan->unacked_frames < chan->remote_tx_win && | |
1683 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1684 | |
18a48e76 | 1685 | skb = chan->tx_send_head; |
e90bac06 | 1686 | |
18a48e76 MM |
1687 | bt_cb(skb)->control.retries = 1; |
1688 | control = &bt_cb(skb)->control; | |
95ffa978 | 1689 | |
e2ab4353 | 1690 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1691 | control->final = 1; |
e2ab4353 | 1692 | |
18a48e76 MM |
1693 | control->reqseq = chan->buffer_seq; |
1694 | chan->last_acked_seq = chan->buffer_seq; | |
1695 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1696 | |
18a48e76 | 1697 | __pack_control(chan, control, skb); |
e90bac06 | 1698 | |
47d1ec61 | 1699 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1700 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1701 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1702 | } |
1703 | ||
18a48e76 MM |
1704 | /* Clone after data has been modified. Data is assumed to be |
1705 | read-only (for locking purposes) on cloned sk_buffs. | |
1706 | */ | |
1707 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1708 | |
18a48e76 MM |
1709 | if (!tx_skb) |
1710 | break; | |
1c2acffb | 1711 | |
18a48e76 | 1712 | __set_retrans_timer(chan); |
836be934 AE |
1713 | |
1714 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1715 | chan->unacked_frames++; |
6a026610 | 1716 | chan->frames_sent++; |
18a48e76 | 1717 | sent++; |
1c2acffb | 1718 | |
58d35f87 GP |
1719 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1720 | chan->tx_send_head = NULL; | |
1c2acffb | 1721 | else |
58d35f87 | 1722 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1723 | |
1724 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1725 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1726 | } |
1727 | ||
b4400672 AE |
1728 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1729 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1730 | |
1731 | return sent; | |
9e917af1 GP |
1732 | } |
1733 | ||
e1fbd4c1 MM |
1734 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1735 | { | |
1736 | struct l2cap_ctrl control; | |
1737 | struct sk_buff *skb; | |
1738 | struct sk_buff *tx_skb; | |
1739 | u16 seq; | |
1740 | ||
1741 | BT_DBG("chan %p", chan); | |
1742 | ||
1743 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1744 | return; | |
1745 | ||
1746 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1747 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1748 | ||
1749 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1750 | if (!skb) { | |
1751 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
1752 | seq); | |
1753 | continue; | |
1754 | } | |
1755 | ||
1756 | bt_cb(skb)->control.retries++; | |
1757 | control = bt_cb(skb)->control; | |
1758 | ||
1759 | if (chan->max_tx != 0 && | |
1760 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1761 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1762 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1763 | l2cap_seq_list_clear(&chan->retrans_list); | |
1764 | break; | |
1765 | } | |
1766 | ||
1767 | control.reqseq = chan->buffer_seq; | |
1768 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1769 | control.final = 1; | |
1770 | else | |
1771 | control.final = 0; | |
1772 | ||
1773 | if (skb_cloned(skb)) { | |
1774 | /* Cloned sk_buffs are read-only, so we need a | |
1775 | * writeable copy | |
1776 | */ | |
1777 | tx_skb = skb_copy(skb, GFP_ATOMIC); | |
1778 | } else { | |
1779 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1780 | } | |
1781 | ||
1782 | if (!tx_skb) { | |
1783 | l2cap_seq_list_clear(&chan->retrans_list); | |
1784 | break; | |
1785 | } | |
1786 | ||
1787 | /* Update skb contents */ | |
1788 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1789 | put_unaligned_le32(__pack_extended_control(&control), | |
1790 | tx_skb->data + L2CAP_HDR_SIZE); | |
1791 | } else { | |
1792 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1793 | tx_skb->data + L2CAP_HDR_SIZE); | |
1794 | } | |
1795 | ||
1796 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1797 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1798 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1799 | L2CAP_FCS_SIZE)); | |
1800 | } | |
1801 | ||
1802 | l2cap_do_send(chan, tx_skb); | |
1803 | ||
1804 | BT_DBG("Resent txseq %d", control.txseq); | |
1805 | ||
1806 | chan->last_acked_seq = chan->buffer_seq; | |
1807 | } | |
1808 | } | |
1809 | ||
f80842a8 MM |
1810 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1811 | struct l2cap_ctrl *control) | |
1812 | { | |
1813 | BT_DBG("chan %p, control %p", chan, control); | |
1814 | ||
1815 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1816 | l2cap_ertm_resend(chan); | |
1817 | } | |
1818 | ||
d2a7ac5d MM |
1819 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1820 | struct l2cap_ctrl *control) | |
1821 | { | |
e1fbd4c1 MM |
1822 | struct sk_buff *skb; |
1823 | ||
1824 | BT_DBG("chan %p, control %p", chan, control); | |
1825 | ||
1826 | if (control->poll) | |
1827 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1828 | ||
1829 | l2cap_seq_list_clear(&chan->retrans_list); | |
1830 | ||
1831 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1832 | return; | |
1833 | ||
1834 | if (chan->unacked_frames) { | |
1835 | skb_queue_walk(&chan->tx_q, skb) { | |
1836 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
1837 | skb == chan->tx_send_head) | |
1838 | break; | |
1839 | } | |
1840 | ||
1841 | skb_queue_walk_from(&chan->tx_q, skb) { | |
1842 | if (skb == chan->tx_send_head) | |
1843 | break; | |
1844 | ||
1845 | l2cap_seq_list_append(&chan->retrans_list, | |
1846 | bt_cb(skb)->control.txseq); | |
1847 | } | |
1848 | ||
1849 | l2cap_ertm_resend(chan); | |
1850 | } | |
d2a7ac5d MM |
1851 | } |
1852 | ||
0a0aba42 | 1853 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1854 | { |
0a0aba42 MM |
1855 | struct l2cap_ctrl control; |
1856 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
1857 | chan->last_acked_seq); | |
1858 | int threshold; | |
9e917af1 | 1859 | |
0a0aba42 MM |
1860 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
1861 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 1862 | |
0a0aba42 MM |
1863 | memset(&control, 0, sizeof(control)); |
1864 | control.sframe = 1; | |
dfc909be | 1865 | |
0a0aba42 MM |
1866 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
1867 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
1868 | __clear_ack_timer(chan); | |
1869 | control.super = L2CAP_SUPER_RNR; | |
1870 | control.reqseq = chan->buffer_seq; | |
1871 | l2cap_send_sframe(chan, &control); | |
1872 | } else { | |
1873 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
1874 | l2cap_ertm_send(chan); | |
1875 | /* If any i-frames were sent, they included an ack */ | |
1876 | if (chan->buffer_seq == chan->last_acked_seq) | |
1877 | frames_to_ack = 0; | |
1878 | } | |
dfc909be | 1879 | |
0a0aba42 MM |
1880 | /* Ack now if the tx window is 3/4ths full. |
1881 | * Calculate without mul or div | |
1882 | */ | |
1883 | threshold = chan->tx_win; | |
1884 | threshold += threshold << 1; | |
1885 | threshold >>= 2; | |
1886 | ||
b4400672 | 1887 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
1888 | threshold); |
1889 | ||
1890 | if (frames_to_ack >= threshold) { | |
1891 | __clear_ack_timer(chan); | |
1892 | control.super = L2CAP_SUPER_RR; | |
1893 | control.reqseq = chan->buffer_seq; | |
1894 | l2cap_send_sframe(chan, &control); | |
1895 | frames_to_ack = 0; | |
1896 | } | |
1c2acffb | 1897 | |
0a0aba42 MM |
1898 | if (frames_to_ack) |
1899 | __set_ack_timer(chan); | |
1900 | } | |
b17e73bb SJ |
1901 | } |
1902 | ||
04124681 GP |
1903 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1904 | struct msghdr *msg, int len, | |
1905 | int count, struct sk_buff *skb) | |
1c2acffb | 1906 | { |
0952a57a | 1907 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1908 | struct sk_buff **frag; |
90338947 | 1909 | int sent = 0; |
1da177e4 | 1910 | |
59203a21 | 1911 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1912 | return -EFAULT; |
1da177e4 LT |
1913 | |
1914 | sent += count; | |
1915 | len -= count; | |
1916 | ||
1917 | /* Continuation fragments (no L2CAP header) */ | |
1918 | frag = &skb_shinfo(skb)->frag_list; | |
1919 | while (len) { | |
fbe00700 GP |
1920 | struct sk_buff *tmp; |
1921 | ||
1da177e4 LT |
1922 | count = min_t(unsigned int, conn->mtu, len); |
1923 | ||
fbe00700 GP |
1924 | tmp = chan->ops->alloc_skb(chan, count, |
1925 | msg->msg_flags & MSG_DONTWAIT); | |
1926 | if (IS_ERR(tmp)) | |
1927 | return PTR_ERR(tmp); | |
1928 | ||
1929 | *frag = tmp; | |
2f7719ce | 1930 | |
1c2acffb GP |
1931 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1932 | return -EFAULT; | |
1da177e4 | 1933 | |
5e59b791 LAD |
1934 | (*frag)->priority = skb->priority; |
1935 | ||
1da177e4 LT |
1936 | sent += count; |
1937 | len -= count; | |
1938 | ||
2d0ed3d5 GP |
1939 | skb->len += (*frag)->len; |
1940 | skb->data_len += (*frag)->len; | |
1941 | ||
1da177e4 LT |
1942 | frag = &(*frag)->next; |
1943 | } | |
1da177e4 LT |
1944 | |
1945 | return sent; | |
1c2acffb | 1946 | } |
1da177e4 | 1947 | |
5e59b791 | 1948 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
1949 | struct msghdr *msg, size_t len, |
1950 | u32 priority) | |
1c2acffb | 1951 | { |
8c1d787b | 1952 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1953 | struct sk_buff *skb; |
03a51213 | 1954 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1955 | struct l2cap_hdr *lh; |
1956 | ||
b4400672 | 1957 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
1958 | |
1959 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1960 | |
1961 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1962 | msg->msg_flags & MSG_DONTWAIT); |
1963 | if (IS_ERR(skb)) | |
1964 | return skb; | |
1c2acffb | 1965 | |
5e59b791 LAD |
1966 | skb->priority = priority; |
1967 | ||
1c2acffb GP |
1968 | /* Create L2CAP header */ |
1969 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1970 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1971 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1972 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1973 | |
0952a57a | 1974 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1975 | if (unlikely(err < 0)) { |
1976 | kfree_skb(skb); | |
1977 | return ERR_PTR(err); | |
1978 | } | |
1979 | return skb; | |
1980 | } | |
1981 | ||
5e59b791 | 1982 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
1983 | struct msghdr *msg, size_t len, |
1984 | u32 priority) | |
1c2acffb | 1985 | { |
8c1d787b | 1986 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1987 | struct sk_buff *skb; |
f2ba7fae | 1988 | int err, count; |
1c2acffb GP |
1989 | struct l2cap_hdr *lh; |
1990 | ||
b4400672 | 1991 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 1992 | |
f2ba7fae | 1993 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1994 | |
f2ba7fae | 1995 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1996 | msg->msg_flags & MSG_DONTWAIT); |
1997 | if (IS_ERR(skb)) | |
1998 | return skb; | |
1c2acffb | 1999 | |
5e59b791 LAD |
2000 | skb->priority = priority; |
2001 | ||
1c2acffb GP |
2002 | /* Create L2CAP header */ |
2003 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2004 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2005 | lh->len = cpu_to_le16(len); |
1c2acffb | 2006 | |
0952a57a | 2007 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2008 | if (unlikely(err < 0)) { |
2009 | kfree_skb(skb); | |
2010 | return ERR_PTR(err); | |
2011 | } | |
2012 | return skb; | |
2013 | } | |
2014 | ||
ab0ff76d | 2015 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2016 | struct msghdr *msg, size_t len, |
2017 | u16 sdulen) | |
1c2acffb | 2018 | { |
8c1d787b | 2019 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2020 | struct sk_buff *skb; |
e4ca6d98 | 2021 | int err, count, hlen; |
1c2acffb GP |
2022 | struct l2cap_hdr *lh; |
2023 | ||
b4400672 | 2024 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2025 | |
0ee0d208 GP |
2026 | if (!conn) |
2027 | return ERR_PTR(-ENOTCONN); | |
2028 | ||
ba7aa64f | 2029 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2030 | |
c74e560c | 2031 | if (sdulen) |
03a51213 | 2032 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2033 | |
47d1ec61 | 2034 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2035 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2036 | |
1c2acffb | 2037 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2038 | |
2039 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2040 | msg->msg_flags & MSG_DONTWAIT); |
2041 | if (IS_ERR(skb)) | |
2042 | return skb; | |
1c2acffb GP |
2043 | |
2044 | /* Create L2CAP header */ | |
2045 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2046 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2047 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2048 | |
18a48e76 MM |
2049 | /* Control header is populated later */ |
2050 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2051 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2052 | else | |
2053 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2054 | |
c74e560c | 2055 | if (sdulen) |
03a51213 | 2056 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2057 | |
0952a57a | 2058 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2059 | if (unlikely(err < 0)) { |
2060 | kfree_skb(skb); | |
2061 | return ERR_PTR(err); | |
2062 | } | |
e90bac06 | 2063 | |
18a48e76 | 2064 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2065 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2066 | return skb; |
1da177e4 LT |
2067 | } |
2068 | ||
94122bbe MM |
2069 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2070 | struct sk_buff_head *seg_queue, | |
2071 | struct msghdr *msg, size_t len) | |
c74e560c | 2072 | { |
c74e560c | 2073 | struct sk_buff *skb; |
94122bbe MM |
2074 | u16 sdu_len; |
2075 | size_t pdu_len; | |
94122bbe | 2076 | u8 sar; |
c74e560c | 2077 | |
b4400672 | 2078 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2079 | |
94122bbe MM |
2080 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2081 | * so fragmented skbs are not used. The HCI layer's handling | |
2082 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2083 | */ | |
c74e560c | 2084 | |
94122bbe MM |
2085 | /* PDU size is derived from the HCI MTU */ |
2086 | pdu_len = chan->conn->mtu; | |
c74e560c | 2087 | |
94122bbe MM |
2088 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2089 | ||
2090 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2091 | if (chan->fcs) |
2092 | pdu_len -= L2CAP_FCS_SIZE; | |
2093 | ||
ba7aa64f | 2094 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2095 | |
2096 | /* Remote device may have requested smaller PDUs */ | |
2097 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2098 | ||
2099 | if (len <= pdu_len) { | |
2100 | sar = L2CAP_SAR_UNSEGMENTED; | |
2101 | sdu_len = 0; | |
2102 | pdu_len = len; | |
2103 | } else { | |
2104 | sar = L2CAP_SAR_START; | |
2105 | sdu_len = len; | |
2106 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2107 | } | |
2108 | ||
2109 | while (len > 0) { | |
2110 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2111 | |
c74e560c | 2112 | if (IS_ERR(skb)) { |
94122bbe | 2113 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2114 | return PTR_ERR(skb); |
2115 | } | |
2116 | ||
94122bbe MM |
2117 | bt_cb(skb)->control.sar = sar; |
2118 | __skb_queue_tail(seg_queue, skb); | |
2119 | ||
2120 | len -= pdu_len; | |
2121 | if (sdu_len) { | |
2122 | sdu_len = 0; | |
2123 | pdu_len += L2CAP_SDULEN_SIZE; | |
2124 | } | |
2125 | ||
2126 | if (len <= pdu_len) { | |
2127 | sar = L2CAP_SAR_END; | |
2128 | pdu_len = len; | |
2129 | } else { | |
2130 | sar = L2CAP_SAR_CONTINUE; | |
2131 | } | |
c74e560c | 2132 | } |
c74e560c | 2133 | |
f0f62799 | 2134 | return 0; |
c74e560c GP |
2135 | } |
2136 | ||
5e59b791 LAD |
2137 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2138 | u32 priority) | |
9a91a04a | 2139 | { |
9a91a04a | 2140 | struct sk_buff *skb; |
9a91a04a | 2141 | int err; |
94122bbe | 2142 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2143 | |
2144 | /* Connectionless channel */ | |
715ec005 | 2145 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2146 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2147 | if (IS_ERR(skb)) |
2148 | return PTR_ERR(skb); | |
2149 | ||
2150 | l2cap_do_send(chan, skb); | |
2151 | return len; | |
2152 | } | |
2153 | ||
2154 | switch (chan->mode) { | |
2155 | case L2CAP_MODE_BASIC: | |
2156 | /* Check outgoing MTU */ | |
2157 | if (len > chan->omtu) | |
2158 | return -EMSGSIZE; | |
2159 | ||
2160 | /* Create a basic PDU */ | |
5e59b791 | 2161 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2162 | if (IS_ERR(skb)) |
2163 | return PTR_ERR(skb); | |
2164 | ||
2165 | l2cap_do_send(chan, skb); | |
2166 | err = len; | |
2167 | break; | |
2168 | ||
2169 | case L2CAP_MODE_ERTM: | |
2170 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2171 | /* Check outgoing MTU */ |
2172 | if (len > chan->omtu) { | |
2173 | err = -EMSGSIZE; | |
2174 | break; | |
2175 | } | |
9a91a04a | 2176 | |
94122bbe | 2177 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2178 | |
94122bbe MM |
2179 | /* Do segmentation before calling in to the state machine, |
2180 | * since it's possible to block while waiting for memory | |
2181 | * allocation. | |
2182 | */ | |
2183 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2184 | |
94122bbe MM |
2185 | /* The channel could have been closed while segmenting, |
2186 | * check that it is still connected. | |
2187 | */ | |
2188 | if (chan->state != BT_CONNECTED) { | |
2189 | __skb_queue_purge(&seg_queue); | |
2190 | err = -ENOTCONN; | |
9a91a04a GP |
2191 | } |
2192 | ||
94122bbe | 2193 | if (err) |
9a91a04a | 2194 | break; |
9a91a04a | 2195 | |
3733937d | 2196 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2197 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2198 | else |
d660366d | 2199 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2200 | |
d660366d | 2201 | err = len; |
9a91a04a | 2202 | |
94122bbe MM |
2203 | /* If the skbs were not queued for sending, they'll still be in |
2204 | * seg_queue and need to be purged. | |
2205 | */ | |
2206 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2207 | break; |
2208 | ||
2209 | default: | |
2210 | BT_DBG("bad state %1.1x", chan->mode); | |
2211 | err = -EBADFD; | |
2212 | } | |
2213 | ||
2214 | return err; | |
2215 | } | |
2216 | ||
d2a7ac5d MM |
2217 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2218 | { | |
bed68bde MM |
2219 | struct l2cap_ctrl control; |
2220 | u16 seq; | |
2221 | ||
b4400672 | 2222 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2223 | |
2224 | memset(&control, 0, sizeof(control)); | |
2225 | control.sframe = 1; | |
2226 | control.super = L2CAP_SUPER_SREJ; | |
2227 | ||
2228 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2229 | seq = __next_seq(chan, seq)) { | |
2230 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2231 | control.reqseq = seq; | |
2232 | l2cap_send_sframe(chan, &control); | |
2233 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2234 | } | |
2235 | } | |
2236 | ||
2237 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2238 | } |
2239 | ||
2240 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2241 | { | |
bed68bde MM |
2242 | struct l2cap_ctrl control; |
2243 | ||
2244 | BT_DBG("chan %p", chan); | |
2245 | ||
2246 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2247 | return; | |
2248 | ||
2249 | memset(&control, 0, sizeof(control)); | |
2250 | control.sframe = 1; | |
2251 | control.super = L2CAP_SUPER_SREJ; | |
2252 | control.reqseq = chan->srej_list.tail; | |
2253 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2254 | } |
2255 | ||
2256 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2257 | { | |
bed68bde MM |
2258 | struct l2cap_ctrl control; |
2259 | u16 initial_head; | |
2260 | u16 seq; | |
2261 | ||
b4400672 | 2262 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2263 | |
2264 | memset(&control, 0, sizeof(control)); | |
2265 | control.sframe = 1; | |
2266 | control.super = L2CAP_SUPER_SREJ; | |
2267 | ||
2268 | /* Capture initial list head to allow only one pass through the list. */ | |
2269 | initial_head = chan->srej_list.head; | |
2270 | ||
2271 | do { | |
2272 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2273 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2274 | break; | |
2275 | ||
2276 | control.reqseq = seq; | |
2277 | l2cap_send_sframe(chan, &control); | |
2278 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2279 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2280 | } |
2281 | ||
608bcc6d MM |
2282 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2283 | { | |
2284 | struct sk_buff *acked_skb; | |
2285 | u16 ackseq; | |
2286 | ||
b4400672 | 2287 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2288 | |
2289 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2290 | return; | |
2291 | ||
b4400672 | 2292 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2293 | chan->expected_ack_seq, chan->unacked_frames); |
2294 | ||
2295 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2296 | ackseq = __next_seq(chan, ackseq)) { | |
2297 | ||
2298 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2299 | if (acked_skb) { | |
2300 | skb_unlink(acked_skb, &chan->tx_q); | |
2301 | kfree_skb(acked_skb); | |
2302 | chan->unacked_frames--; | |
2303 | } | |
2304 | } | |
2305 | ||
2306 | chan->expected_ack_seq = reqseq; | |
2307 | ||
2308 | if (chan->unacked_frames == 0) | |
2309 | __clear_retrans_timer(chan); | |
2310 | ||
b4400672 | 2311 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2312 | } |
2313 | ||
2314 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2315 | { | |
2316 | BT_DBG("chan %p", chan); | |
2317 | ||
2318 | chan->expected_tx_seq = chan->buffer_seq; | |
2319 | l2cap_seq_list_clear(&chan->srej_list); | |
2320 | skb_queue_purge(&chan->srej_q); | |
2321 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2322 | } | |
2323 | ||
d660366d GP |
2324 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2325 | struct l2cap_ctrl *control, | |
2326 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2327 | { |
608bcc6d MM |
2328 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2329 | event); | |
2330 | ||
2331 | switch (event) { | |
2332 | case L2CAP_EV_DATA_REQUEST: | |
2333 | if (chan->tx_send_head == NULL) | |
2334 | chan->tx_send_head = skb_peek(skbs); | |
2335 | ||
2336 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2337 | l2cap_ertm_send(chan); | |
2338 | break; | |
2339 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2340 | BT_DBG("Enter LOCAL_BUSY"); | |
2341 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2342 | ||
2343 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2344 | /* The SREJ_SENT state must be aborted if we are to | |
2345 | * enter the LOCAL_BUSY state. | |
2346 | */ | |
2347 | l2cap_abort_rx_srej_sent(chan); | |
2348 | } | |
2349 | ||
2350 | l2cap_send_ack(chan); | |
2351 | ||
2352 | break; | |
2353 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2354 | BT_DBG("Exit LOCAL_BUSY"); | |
2355 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2356 | ||
2357 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2358 | struct l2cap_ctrl local_control; | |
2359 | ||
2360 | memset(&local_control, 0, sizeof(local_control)); | |
2361 | local_control.sframe = 1; | |
2362 | local_control.super = L2CAP_SUPER_RR; | |
2363 | local_control.poll = 1; | |
2364 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2365 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2366 | |
2367 | chan->retry_count = 1; | |
2368 | __set_monitor_timer(chan); | |
2369 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2370 | } | |
2371 | break; | |
2372 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2373 | l2cap_process_reqseq(chan, control->reqseq); | |
2374 | break; | |
2375 | case L2CAP_EV_EXPLICIT_POLL: | |
2376 | l2cap_send_rr_or_rnr(chan, 1); | |
2377 | chan->retry_count = 1; | |
2378 | __set_monitor_timer(chan); | |
2379 | __clear_ack_timer(chan); | |
2380 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2381 | break; | |
2382 | case L2CAP_EV_RETRANS_TO: | |
2383 | l2cap_send_rr_or_rnr(chan, 1); | |
2384 | chan->retry_count = 1; | |
2385 | __set_monitor_timer(chan); | |
2386 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2387 | break; | |
2388 | case L2CAP_EV_RECV_FBIT: | |
2389 | /* Nothing to process */ | |
2390 | break; | |
2391 | default: | |
2392 | break; | |
2393 | } | |
608bcc6d MM |
2394 | } |
2395 | ||
d660366d GP |
2396 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2397 | struct l2cap_ctrl *control, | |
2398 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2399 | { |
608bcc6d MM |
2400 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2401 | event); | |
2402 | ||
2403 | switch (event) { | |
2404 | case L2CAP_EV_DATA_REQUEST: | |
2405 | if (chan->tx_send_head == NULL) | |
2406 | chan->tx_send_head = skb_peek(skbs); | |
2407 | /* Queue data, but don't send. */ | |
2408 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2409 | break; | |
2410 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2411 | BT_DBG("Enter LOCAL_BUSY"); | |
2412 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2413 | ||
2414 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2415 | /* The SREJ_SENT state must be aborted if we are to | |
2416 | * enter the LOCAL_BUSY state. | |
2417 | */ | |
2418 | l2cap_abort_rx_srej_sent(chan); | |
2419 | } | |
2420 | ||
2421 | l2cap_send_ack(chan); | |
2422 | ||
2423 | break; | |
2424 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2425 | BT_DBG("Exit LOCAL_BUSY"); | |
2426 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2427 | ||
2428 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2429 | struct l2cap_ctrl local_control; | |
2430 | memset(&local_control, 0, sizeof(local_control)); | |
2431 | local_control.sframe = 1; | |
2432 | local_control.super = L2CAP_SUPER_RR; | |
2433 | local_control.poll = 1; | |
2434 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2435 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2436 | |
2437 | chan->retry_count = 1; | |
2438 | __set_monitor_timer(chan); | |
2439 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2440 | } | |
2441 | break; | |
2442 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2443 | l2cap_process_reqseq(chan, control->reqseq); | |
2444 | ||
2445 | /* Fall through */ | |
2446 | ||
2447 | case L2CAP_EV_RECV_FBIT: | |
2448 | if (control && control->final) { | |
2449 | __clear_monitor_timer(chan); | |
2450 | if (chan->unacked_frames > 0) | |
2451 | __set_retrans_timer(chan); | |
2452 | chan->retry_count = 0; | |
2453 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2454 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2455 | } | |
2456 | break; | |
2457 | case L2CAP_EV_EXPLICIT_POLL: | |
2458 | /* Ignore */ | |
2459 | break; | |
2460 | case L2CAP_EV_MONITOR_TO: | |
2461 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2462 | l2cap_send_rr_or_rnr(chan, 1); | |
2463 | __set_monitor_timer(chan); | |
2464 | chan->retry_count++; | |
2465 | } else { | |
2466 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2467 | } | |
2468 | break; | |
2469 | default: | |
2470 | break; | |
2471 | } | |
608bcc6d MM |
2472 | } |
2473 | ||
d660366d GP |
2474 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2475 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2476 | { |
608bcc6d MM |
2477 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2478 | chan, control, skbs, event, chan->tx_state); | |
2479 | ||
2480 | switch (chan->tx_state) { | |
2481 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2482 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2483 | break; |
2484 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2485 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2486 | break; |
2487 | default: | |
2488 | /* Ignore event */ | |
2489 | break; | |
2490 | } | |
608bcc6d MM |
2491 | } |
2492 | ||
4b51dae9 MM |
2493 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2494 | struct l2cap_ctrl *control) | |
2495 | { | |
2496 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2497 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2498 | } |
2499 | ||
f80842a8 MM |
2500 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2501 | struct l2cap_ctrl *control) | |
2502 | { | |
2503 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2504 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2505 | } |
2506 | ||
1da177e4 LT |
2507 | /* Copy frame to all raw sockets on that connection */ |
2508 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2509 | { | |
1da177e4 | 2510 | struct sk_buff *nskb; |
48454079 | 2511 | struct l2cap_chan *chan; |
1da177e4 LT |
2512 | |
2513 | BT_DBG("conn %p", conn); | |
2514 | ||
3df91ea2 | 2515 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2516 | |
3df91ea2 | 2517 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2518 | struct sock *sk = chan->sk; |
715ec005 | 2519 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2520 | continue; |
2521 | ||
2522 | /* Don't send frame to the socket it came from */ | |
2523 | if (skb->sk == sk) | |
2524 | continue; | |
af05b30b GP |
2525 | nskb = skb_clone(skb, GFP_ATOMIC); |
2526 | if (!nskb) | |
1da177e4 LT |
2527 | continue; |
2528 | ||
80b98027 | 2529 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2530 | kfree_skb(nskb); |
2531 | } | |
3d57dc68 | 2532 | |
3df91ea2 | 2533 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2534 | } |
2535 | ||
2536 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2537 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2538 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2539 | { |
2540 | struct sk_buff *skb, **frag; | |
2541 | struct l2cap_cmd_hdr *cmd; | |
2542 | struct l2cap_hdr *lh; | |
2543 | int len, count; | |
2544 | ||
b4400672 AE |
2545 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2546 | conn, code, ident, dlen); | |
1da177e4 LT |
2547 | |
2548 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2549 | count = min_t(unsigned int, conn->mtu, len); | |
2550 | ||
2551 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2552 | if (!skb) | |
2553 | return NULL; | |
2554 | ||
2555 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2556 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2557 | |
2558 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2559 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2560 | else |
ac73498c | 2561 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2562 | |
2563 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2564 | cmd->code = code; | |
2565 | cmd->ident = ident; | |
aca3192c | 2566 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2567 | |
2568 | if (dlen) { | |
2569 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2570 | memcpy(skb_put(skb, count), data, count); | |
2571 | data += count; | |
2572 | } | |
2573 | ||
2574 | len -= skb->len; | |
2575 | ||
2576 | /* Continuation fragments (no L2CAP header) */ | |
2577 | frag = &skb_shinfo(skb)->frag_list; | |
2578 | while (len) { | |
2579 | count = min_t(unsigned int, conn->mtu, len); | |
2580 | ||
2581 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2582 | if (!*frag) | |
2583 | goto fail; | |
2584 | ||
2585 | memcpy(skb_put(*frag, count), data, count); | |
2586 | ||
2587 | len -= count; | |
2588 | data += count; | |
2589 | ||
2590 | frag = &(*frag)->next; | |
2591 | } | |
2592 | ||
2593 | return skb; | |
2594 | ||
2595 | fail: | |
2596 | kfree_skb(skb); | |
2597 | return NULL; | |
2598 | } | |
2599 | ||
2600 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2601 | { | |
2602 | struct l2cap_conf_opt *opt = *ptr; | |
2603 | int len; | |
2604 | ||
2605 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2606 | *ptr += len; | |
2607 | ||
2608 | *type = opt->type; | |
2609 | *olen = opt->len; | |
2610 | ||
2611 | switch (opt->len) { | |
2612 | case 1: | |
2613 | *val = *((u8 *) opt->val); | |
2614 | break; | |
2615 | ||
2616 | case 2: | |
bfaaeb3e | 2617 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2618 | break; |
2619 | ||
2620 | case 4: | |
bfaaeb3e | 2621 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2622 | break; |
2623 | ||
2624 | default: | |
2625 | *val = (unsigned long) opt->val; | |
2626 | break; | |
2627 | } | |
2628 | ||
b4400672 | 2629 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2630 | return len; |
2631 | } | |
2632 | ||
1da177e4 LT |
2633 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2634 | { | |
2635 | struct l2cap_conf_opt *opt = *ptr; | |
2636 | ||
b4400672 | 2637 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2638 | |
2639 | opt->type = type; | |
2640 | opt->len = len; | |
2641 | ||
2642 | switch (len) { | |
2643 | case 1: | |
2644 | *((u8 *) opt->val) = val; | |
2645 | break; | |
2646 | ||
2647 | case 2: | |
4f8b691c | 2648 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2649 | break; |
2650 | ||
2651 | case 4: | |
4f8b691c | 2652 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2653 | break; |
2654 | ||
2655 | default: | |
2656 | memcpy(opt->val, (void *) val, len); | |
2657 | break; | |
2658 | } | |
2659 | ||
2660 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2661 | } | |
2662 | ||
f89cef09 AE |
2663 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2664 | { | |
2665 | struct l2cap_conf_efs efs; | |
2666 | ||
1ec918ce | 2667 | switch (chan->mode) { |
f89cef09 AE |
2668 | case L2CAP_MODE_ERTM: |
2669 | efs.id = chan->local_id; | |
2670 | efs.stype = chan->local_stype; | |
2671 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2672 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c AE |
2673 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
2674 | efs.flush_to = __constant_cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
2675 | break; |
2676 | ||
2677 | case L2CAP_MODE_STREAMING: | |
2678 | efs.id = 1; | |
2679 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2680 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2681 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2682 | efs.acc_lat = 0; | |
2683 | efs.flush_to = 0; | |
2684 | break; | |
2685 | ||
2686 | default: | |
2687 | return; | |
2688 | } | |
2689 | ||
2690 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2691 | (unsigned long) &efs); | |
2692 | } | |
2693 | ||
721c4181 | 2694 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2695 | { |
721c4181 | 2696 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2697 | ack_timer.work); |
2698 | u16 frames_to_ack; | |
c1b4f43b | 2699 | |
2fb9b3d4 GP |
2700 | BT_DBG("chan %p", chan); |
2701 | ||
6be36555 AE |
2702 | l2cap_chan_lock(chan); |
2703 | ||
0362520b MM |
2704 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2705 | chan->last_acked_seq); | |
6be36555 | 2706 | |
0362520b MM |
2707 | if (frames_to_ack) |
2708 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2709 | |
0362520b | 2710 | l2cap_chan_unlock(chan); |
09bfb2ee | 2711 | l2cap_chan_put(chan); |
c1b4f43b GP |
2712 | } |
2713 | ||
466f8004 | 2714 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2715 | { |
3c588192 MM |
2716 | int err; |
2717 | ||
105bdf9e MM |
2718 | chan->next_tx_seq = 0; |
2719 | chan->expected_tx_seq = 0; | |
42e5c802 | 2720 | chan->expected_ack_seq = 0; |
6a026610 | 2721 | chan->unacked_frames = 0; |
42e5c802 | 2722 | chan->buffer_seq = 0; |
6a026610 | 2723 | chan->frames_sent = 0; |
105bdf9e MM |
2724 | chan->last_acked_seq = 0; |
2725 | chan->sdu = NULL; | |
2726 | chan->sdu_last_frag = NULL; | |
2727 | chan->sdu_len = 0; | |
2728 | ||
d34c34fb MM |
2729 | skb_queue_head_init(&chan->tx_q); |
2730 | ||
105bdf9e MM |
2731 | if (chan->mode != L2CAP_MODE_ERTM) |
2732 | return 0; | |
2733 | ||
2734 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2735 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2736 | |
721c4181 GP |
2737 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2738 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2739 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2740 | |
f1c6775b | 2741 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2742 | |
3c588192 MM |
2743 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2744 | if (err < 0) | |
2745 | return err; | |
2746 | ||
9dc9affc MM |
2747 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2748 | if (err < 0) | |
2749 | l2cap_seq_list_free(&chan->srej_list); | |
2750 | ||
2751 | return err; | |
0565c1c2 GP |
2752 | } |
2753 | ||
f2fcfcd6 GP |
2754 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2755 | { | |
2756 | switch (mode) { | |
2757 | case L2CAP_MODE_STREAMING: | |
2758 | case L2CAP_MODE_ERTM: | |
2759 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2760 | return mode; | |
2761 | /* fall through */ | |
2762 | default: | |
2763 | return L2CAP_MODE_BASIC; | |
2764 | } | |
2765 | } | |
2766 | ||
6327eb98 AE |
2767 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2768 | { | |
2769 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2770 | } | |
2771 | ||
f89cef09 AE |
2772 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2773 | { | |
2774 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2775 | } | |
2776 | ||
6327eb98 AE |
2777 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2778 | { | |
2779 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2780 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2781 | /* use extended control field */ |
2782 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2783 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2784 | } else { | |
6327eb98 AE |
2785 | chan->tx_win = min_t(u16, chan->tx_win, |
2786 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2787 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2788 | } | |
6327eb98 AE |
2789 | } |
2790 | ||
710f9b0a | 2791 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2792 | { |
1da177e4 | 2793 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2794 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2795 | void *ptr = req->data; |
c8f79162 | 2796 | u16 size; |
1da177e4 | 2797 | |
49208c9c | 2798 | BT_DBG("chan %p", chan); |
1da177e4 | 2799 | |
73ffa904 | 2800 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2801 | goto done; |
2802 | ||
0c1bc5c6 | 2803 | switch (chan->mode) { |
f2fcfcd6 GP |
2804 | case L2CAP_MODE_STREAMING: |
2805 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2806 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2807 | break; |
85eb53c6 | 2808 | |
f89cef09 AE |
2809 | if (__l2cap_efs_supported(chan)) |
2810 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2811 | ||
2ba13ed6 | 2812 | /* fall through */ |
f2fcfcd6 | 2813 | default: |
8c1d787b | 2814 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2815 | break; |
2816 | } | |
2817 | ||
2818 | done: | |
0c1bc5c6 GP |
2819 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2820 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2821 | |
0c1bc5c6 | 2822 | switch (chan->mode) { |
65c7c491 | 2823 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2824 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2825 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2826 | break; |
2827 | ||
62547752 GP |
2828 | rfc.mode = L2CAP_MODE_BASIC; |
2829 | rfc.txwin_size = 0; | |
2830 | rfc.max_transmit = 0; | |
2831 | rfc.retrans_timeout = 0; | |
2832 | rfc.monitor_timeout = 0; | |
2833 | rfc.max_pdu_size = 0; | |
2834 | ||
63406504 GP |
2835 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2836 | (unsigned long) &rfc); | |
65c7c491 MH |
2837 | break; |
2838 | ||
2839 | case L2CAP_MODE_ERTM: | |
2840 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2841 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2842 | rfc.retrans_timeout = 0; |
2843 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2844 | |
2845 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2846 | L2CAP_EXT_HDR_SIZE - | |
2847 | L2CAP_SDULEN_SIZE - | |
2848 | L2CAP_FCS_SIZE); | |
2849 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2850 | |
6327eb98 AE |
2851 | l2cap_txwin_setup(chan); |
2852 | ||
2853 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2854 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2855 | |
63406504 GP |
2856 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2857 | (unsigned long) &rfc); | |
2858 | ||
f89cef09 AE |
2859 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2860 | l2cap_add_opt_efs(&ptr, chan); | |
2861 | ||
8c1d787b | 2862 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2863 | break; |
2864 | ||
47d1ec61 | 2865 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2866 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2867 | chan->fcs = L2CAP_FCS_NONE; |
2868 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2869 | } |
6327eb98 AE |
2870 | |
2871 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2872 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2873 | chan->tx_win); | |
f2fcfcd6 GP |
2874 | break; |
2875 | ||
2876 | case L2CAP_MODE_STREAMING: | |
273759e2 | 2877 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
2878 | rfc.mode = L2CAP_MODE_STREAMING; |
2879 | rfc.txwin_size = 0; | |
2880 | rfc.max_transmit = 0; | |
2881 | rfc.retrans_timeout = 0; | |
2882 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2883 | |
2884 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2885 | L2CAP_EXT_HDR_SIZE - | |
2886 | L2CAP_SDULEN_SIZE - | |
2887 | L2CAP_FCS_SIZE); | |
2888 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2889 | |
63406504 GP |
2890 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2891 | (unsigned long) &rfc); | |
2892 | ||
f89cef09 AE |
2893 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2894 | l2cap_add_opt_efs(&ptr, chan); | |
2895 | ||
8c1d787b | 2896 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2897 | break; |
2898 | ||
47d1ec61 | 2899 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2900 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2901 | chan->fcs = L2CAP_FCS_NONE; |
2902 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2903 | } |
65c7c491 MH |
2904 | break; |
2905 | } | |
1da177e4 | 2906 | |
fe4128e0 | 2907 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 2908 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
2909 | |
2910 | return ptr - data; | |
2911 | } | |
2912 | ||
73ffa904 | 2913 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2914 | { |
5dee9e7c MH |
2915 | struct l2cap_conf_rsp *rsp = data; |
2916 | void *ptr = rsp->data; | |
73ffa904 GP |
2917 | void *req = chan->conf_req; |
2918 | int len = chan->conf_len; | |
5dee9e7c MH |
2919 | int type, hint, olen; |
2920 | unsigned long val; | |
6464f35f | 2921 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2922 | struct l2cap_conf_efs efs; |
2923 | u8 remote_efs = 0; | |
861d6882 | 2924 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2925 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2926 | u16 size; |
1da177e4 | 2927 | |
73ffa904 | 2928 | BT_DBG("chan %p", chan); |
820ae1b8 | 2929 | |
5dee9e7c MH |
2930 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2931 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2932 | |
589d2746 | 2933 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2934 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2935 | |
2936 | switch (type) { | |
2937 | case L2CAP_CONF_MTU: | |
861d6882 | 2938 | mtu = val; |
5dee9e7c MH |
2939 | break; |
2940 | ||
2941 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2942 | chan->flush_to = val; |
5dee9e7c MH |
2943 | break; |
2944 | ||
2945 | case L2CAP_CONF_QOS: | |
2946 | break; | |
2947 | ||
6464f35f MH |
2948 | case L2CAP_CONF_RFC: |
2949 | if (olen == sizeof(rfc)) | |
2950 | memcpy(&rfc, (void *) val, olen); | |
2951 | break; | |
2952 | ||
fcc203c3 GP |
2953 | case L2CAP_CONF_FCS: |
2954 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2955 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2956 | break; |
fcc203c3 | 2957 | |
42dceae2 AE |
2958 | case L2CAP_CONF_EFS: |
2959 | remote_efs = 1; | |
2960 | if (olen == sizeof(efs)) | |
2961 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2962 | break; |
2963 | ||
6327eb98 AE |
2964 | case L2CAP_CONF_EWS: |
2965 | if (!enable_hs) | |
2966 | return -ECONNREFUSED; | |
fcc203c3 | 2967 | |
6327eb98 AE |
2968 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2969 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2970 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2971 | chan->remote_tx_win = val; |
fcc203c3 GP |
2972 | break; |
2973 | ||
5dee9e7c MH |
2974 | default: |
2975 | if (hint) | |
2976 | break; | |
2977 | ||
2978 | result = L2CAP_CONF_UNKNOWN; | |
2979 | *((u8 *) ptr++) = type; | |
2980 | break; | |
2981 | } | |
2982 | } | |
2983 | ||
73ffa904 | 2984 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2985 | goto done; |
2986 | ||
0c1bc5c6 | 2987 | switch (chan->mode) { |
f2fcfcd6 GP |
2988 | case L2CAP_MODE_STREAMING: |
2989 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2990 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2991 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2992 | chan->conn->feat_mask); |
85eb53c6 GP |
2993 | break; |
2994 | } | |
2995 | ||
42dceae2 AE |
2996 | if (remote_efs) { |
2997 | if (__l2cap_efs_supported(chan)) | |
2998 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2999 | else | |
3000 | return -ECONNREFUSED; | |
3001 | } | |
3002 | ||
0c1bc5c6 | 3003 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3004 | return -ECONNREFUSED; |
742e519b | 3005 | |
f2fcfcd6 | 3006 | break; |
f2fcfcd6 GP |
3007 | } |
3008 | ||
3009 | done: | |
0c1bc5c6 | 3010 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3011 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3012 | rfc.mode = chan->mode; |
f2fcfcd6 | 3013 | |
73ffa904 | 3014 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3015 | return -ECONNREFUSED; |
3016 | ||
3017 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3018 | sizeof(rfc), (unsigned long) &rfc); | |
3019 | } | |
3020 | ||
5dee9e7c MH |
3021 | if (result == L2CAP_CONF_SUCCESS) { |
3022 | /* Configure output options and let the other side know | |
3023 | * which ones we don't like. */ | |
3024 | ||
f2fcfcd6 GP |
3025 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3026 | result = L2CAP_CONF_UNACCEPT; | |
3027 | else { | |
0c1bc5c6 | 3028 | chan->omtu = mtu; |
c1360a1c | 3029 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3030 | } |
0c1bc5c6 | 3031 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3032 | |
42dceae2 AE |
3033 | if (remote_efs) { |
3034 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3035 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3036 | efs.stype != chan->local_stype) { | |
3037 | ||
3038 | result = L2CAP_CONF_UNACCEPT; | |
3039 | ||
3040 | if (chan->num_conf_req >= 1) | |
3041 | return -ECONNREFUSED; | |
3042 | ||
3043 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 3044 | sizeof(efs), |
42dceae2 | 3045 | (unsigned long) &efs); |
0e8b207e | 3046 | } else { |
3e6b3b95 | 3047 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3048 | result = L2CAP_CONF_PENDING; |
3049 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3050 | } |
3051 | } | |
3052 | ||
f2fcfcd6 GP |
3053 | switch (rfc.mode) { |
3054 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3055 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3056 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3057 | break; |
3058 | ||
3059 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3060 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3061 | chan->remote_tx_win = rfc.txwin_size; | |
3062 | else | |
3063 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3064 | |
2c03a7a4 | 3065 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3066 | |
c8f79162 AE |
3067 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3068 | chan->conn->mtu - | |
3069 | L2CAP_EXT_HDR_SIZE - | |
3070 | L2CAP_SDULEN_SIZE - | |
3071 | L2CAP_FCS_SIZE); | |
3072 | rfc.max_pdu_size = cpu_to_le16(size); | |
3073 | chan->remote_mps = size; | |
f2fcfcd6 | 3074 | |
10467e9e | 3075 | rfc.retrans_timeout = |
4fd21a88 | 3076 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3077 | rfc.monitor_timeout = |
4fd21a88 | 3078 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3079 | |
c1360a1c | 3080 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3081 | |
3082 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3083 | sizeof(rfc), (unsigned long) &rfc); | |
3084 | ||
42dceae2 AE |
3085 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3086 | chan->remote_id = efs.id; | |
3087 | chan->remote_stype = efs.stype; | |
3088 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3089 | chan->remote_flush_to = | |
3090 | le32_to_cpu(efs.flush_to); | |
3091 | chan->remote_acc_lat = | |
3092 | le32_to_cpu(efs.acc_lat); | |
3093 | chan->remote_sdu_itime = | |
3094 | le32_to_cpu(efs.sdu_itime); | |
3095 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3096 | sizeof(efs), (unsigned long) &efs); | |
3097 | } | |
f2fcfcd6 GP |
3098 | break; |
3099 | ||
3100 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
3101 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3102 | chan->conn->mtu - | |
3103 | L2CAP_EXT_HDR_SIZE - | |
3104 | L2CAP_SDULEN_SIZE - | |
3105 | L2CAP_FCS_SIZE); | |
3106 | rfc.max_pdu_size = cpu_to_le16(size); | |
3107 | chan->remote_mps = size; | |
f2fcfcd6 | 3108 | |
c1360a1c | 3109 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3110 | |
3111 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3112 | sizeof(rfc), (unsigned long) &rfc); | |
3113 | ||
f2fcfcd6 GP |
3114 | break; |
3115 | ||
3116 | default: | |
5dee9e7c | 3117 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3118 | |
6464f35f | 3119 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3120 | rfc.mode = chan->mode; |
f2fcfcd6 | 3121 | } |
6464f35f | 3122 | |
f2fcfcd6 | 3123 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3124 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3125 | } |
fe4128e0 | 3126 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3127 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3128 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3129 | |
3130 | return ptr - data; | |
1da177e4 LT |
3131 | } |
3132 | ||
b4450035 | 3133 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 3134 | { |
f2fcfcd6 GP |
3135 | struct l2cap_conf_req *req = data; |
3136 | void *ptr = req->data; | |
3137 | int type, olen; | |
3138 | unsigned long val; | |
36e999a8 | 3139 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3140 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3141 | |
fe4128e0 | 3142 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3143 | |
3144 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3145 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3146 | ||
3147 | switch (type) { | |
3148 | case L2CAP_CONF_MTU: | |
3149 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3150 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3151 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3152 | } else |
0c1bc5c6 GP |
3153 | chan->imtu = val; |
3154 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3155 | break; |
3156 | ||
3157 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3158 | chan->flush_to = val; |
f2fcfcd6 | 3159 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 3160 | 2, chan->flush_to); |
f2fcfcd6 GP |
3161 | break; |
3162 | ||
3163 | case L2CAP_CONF_RFC: | |
3164 | if (olen == sizeof(rfc)) | |
3165 | memcpy(&rfc, (void *)val, olen); | |
3166 | ||
c1360a1c | 3167 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 3168 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3169 | return -ECONNREFUSED; |
3170 | ||
47d1ec61 | 3171 | chan->fcs = 0; |
f2fcfcd6 GP |
3172 | |
3173 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
3174 | sizeof(rfc), (unsigned long) &rfc); | |
3175 | break; | |
6327eb98 AE |
3176 | |
3177 | case L2CAP_CONF_EWS: | |
3178 | chan->tx_win = min_t(u16, val, | |
3179 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
3180 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
3181 | chan->tx_win); | |
6327eb98 | 3182 | break; |
66af7aaf AE |
3183 | |
3184 | case L2CAP_CONF_EFS: | |
3185 | if (olen == sizeof(efs)) | |
3186 | memcpy(&efs, (void *)val, olen); | |
3187 | ||
3188 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
3189 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
3190 | efs.stype != chan->local_stype) | |
3191 | return -ECONNREFUSED; | |
3192 | ||
3193 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3194 | sizeof(efs), (unsigned long) &efs); | |
3195 | break; | |
f2fcfcd6 GP |
3196 | } |
3197 | } | |
3198 | ||
0c1bc5c6 | 3199 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3200 | return -ECONNREFUSED; |
3201 | ||
0c1bc5c6 | 3202 | chan->mode = rfc.mode; |
6c2ea7a8 | 3203 | |
0e8b207e | 3204 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3205 | switch (rfc.mode) { |
3206 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3207 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3208 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3209 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
3210 | |
3211 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3212 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3213 | chan->local_sdu_itime = | |
3214 | le32_to_cpu(efs.sdu_itime); | |
3215 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
3216 | chan->local_flush_to = | |
3217 | le32_to_cpu(efs.flush_to); | |
3218 | } | |
f2fcfcd6 | 3219 | break; |
66af7aaf | 3220 | |
f2fcfcd6 | 3221 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3222 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3223 | } |
3224 | } | |
3225 | ||
fe4128e0 | 3226 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3227 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3228 | |
3229 | return ptr - data; | |
3230 | } | |
3231 | ||
fe4128e0 | 3232 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
3233 | { |
3234 | struct l2cap_conf_rsp *rsp = data; | |
3235 | void *ptr = rsp->data; | |
1da177e4 | 3236 | |
fe4128e0 | 3237 | BT_DBG("chan %p", chan); |
1da177e4 | 3238 | |
fe4128e0 | 3239 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3240 | rsp->result = cpu_to_le16(result); |
aca3192c | 3241 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3242 | |
3243 | return ptr - data; | |
3244 | } | |
3245 | ||
8c1d787b | 3246 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3247 | { |
3248 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3249 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3250 | u8 buf[128]; |
3251 | ||
fe4128e0 GP |
3252 | rsp.scid = cpu_to_le16(chan->dcid); |
3253 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3254 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3255 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
710f9b0a GP |
3256 | l2cap_send_cmd(conn, chan->ident, |
3257 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3258 | ||
c1360a1c | 3259 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3260 | return; |
3261 | ||
710f9b0a GP |
3262 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
3263 | l2cap_build_conf_req(chan, buf), buf); | |
3264 | chan->num_conf_req++; | |
3265 | } | |
3266 | ||
47d1ec61 | 3267 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3268 | { |
7b1c0049 GP |
3269 | int type, olen; |
3270 | unsigned long val; | |
3271 | struct l2cap_conf_rfc rfc; | |
3272 | ||
47d1ec61 | 3273 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3274 | |
0c1bc5c6 | 3275 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3276 | return; |
3277 | ||
3278 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3279 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3280 | ||
8f321f85 SJ |
3281 | if (type != L2CAP_CONF_RFC) |
3282 | continue; | |
3283 | ||
3284 | if (olen != sizeof(rfc)) | |
3285 | break; | |
3286 | ||
3287 | memcpy(&rfc, (void *)val, olen); | |
3288 | goto done; | |
7b1c0049 GP |
3289 | } |
3290 | ||
36e999a8 MM |
3291 | /* Use sane default values in case a misbehaving remote device |
3292 | * did not send an RFC option. | |
3293 | */ | |
3294 | rfc.mode = chan->mode; | |
ac73498c AE |
3295 | rfc.retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3296 | rfc.monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36e999a8 MM |
3297 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); |
3298 | ||
3299 | BT_ERR("Expected RFC option was not found, using defaults"); | |
3300 | ||
7b1c0049 GP |
3301 | done: |
3302 | switch (rfc.mode) { | |
3303 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3304 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3305 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3306 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
3307 | break; |
3308 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3309 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3310 | } |
3311 | } | |
3312 | ||
4e8402a3 MH |
3313 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3314 | { | |
e2fd318e | 3315 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3316 | |
e2fd318e | 3317 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3318 | return 0; |
3319 | ||
3320 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
3321 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 3322 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3323 | |
3324 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3325 | conn->info_ident = 0; |
984947dc | 3326 | |
4e8402a3 MH |
3327 | l2cap_conn_start(conn); |
3328 | } | |
3329 | ||
3330 | return 0; | |
3331 | } | |
3332 | ||
1da177e4 LT |
3333 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3334 | { | |
1da177e4 LT |
3335 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3336 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3337 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3338 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3339 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3340 | |
3341 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3342 | __le16 psm = req->psm; |
1da177e4 | 3343 | |
097db76c | 3344 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3345 | |
3346 | /* Check if we have socket listening on psm */ | |
c2287681 | 3347 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3348 | if (!pchan) { |
1da177e4 LT |
3349 | result = L2CAP_CR_BAD_PSM; |
3350 | goto sendresp; | |
3351 | } | |
3352 | ||
23691d75 GP |
3353 | parent = pchan->sk; |
3354 | ||
3df91ea2 | 3355 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3356 | lock_sock(parent); |
e0f0cb56 | 3357 | |
e7c29cb1 | 3358 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3359 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
e7c29cb1 | 3360 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3361 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3362 | result = L2CAP_CR_SEC_BLOCK; |
3363 | goto response; | |
3364 | } | |
3365 | ||
1da177e4 LT |
3366 | result = L2CAP_CR_NO_MEM; |
3367 | ||
2dfa1003 GP |
3368 | /* Check if we already have channel with that dcid */ |
3369 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3370 | goto response; | |
3371 | ||
80b98027 | 3372 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3373 | if (!chan) |
1da177e4 LT |
3374 | goto response; |
3375 | ||
80808e43 GP |
3376 | sk = chan->sk; |
3377 | ||
1da177e4 LT |
3378 | hci_conn_hold(conn->hcon); |
3379 | ||
1da177e4 LT |
3380 | bacpy(&bt_sk(sk)->src, conn->src); |
3381 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3382 | chan->psm = psm; |
3383 | chan->dcid = scid; | |
1da177e4 | 3384 | |
d1010240 GP |
3385 | bt_accept_enqueue(parent, sk); |
3386 | ||
6be36555 | 3387 | __l2cap_chan_add(conn, chan); |
48454079 | 3388 | |
fe4128e0 | 3389 | dcid = chan->scid; |
1da177e4 | 3390 | |
c9b66675 | 3391 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3392 | |
fc7f8a7e | 3393 | chan->ident = cmd->ident; |
1da177e4 | 3394 | |
984947dc | 3395 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3396 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3397 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3398 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3399 | result = L2CAP_CR_PEND; |
3400 | status = L2CAP_CS_AUTHOR_PEND; | |
3401 | parent->sk_data_ready(parent, 0); | |
3402 | } else { | |
0e587be7 | 3403 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3404 | result = L2CAP_CR_SUCCESS; |
3405 | status = L2CAP_CS_NO_INFO; | |
3406 | } | |
79d554a6 | 3407 | } else { |
0e587be7 | 3408 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3409 | result = L2CAP_CR_PEND; |
3410 | status = L2CAP_CS_AUTHEN_PEND; | |
3411 | } | |
3412 | } else { | |
0e587be7 | 3413 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3414 | result = L2CAP_CR_PEND; |
3415 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3416 | } |
3417 | ||
1da177e4 | 3418 | response: |
aa2ac881 | 3419 | release_sock(parent); |
3df91ea2 | 3420 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3421 | |
3422 | sendresp: | |
aca3192c YH |
3423 | rsp.scid = cpu_to_le16(scid); |
3424 | rsp.dcid = cpu_to_le16(dcid); | |
3425 | rsp.result = cpu_to_le16(result); | |
3426 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3427 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3428 | |
3429 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3430 | struct l2cap_info_req info; | |
ac73498c | 3431 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3432 | |
3433 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3434 | conn->info_ident = l2cap_get_ident(conn); | |
3435 | ||
ba13ccd9 | 3436 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3437 | |
3438 | l2cap_send_cmd(conn, conn->info_ident, | |
3439 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3440 | } | |
3441 | ||
c1360a1c | 3442 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3443 | result == L2CAP_CR_SUCCESS) { |
3444 | u8 buf[128]; | |
c1360a1c | 3445 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3446 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3447 | l2cap_build_conf_req(chan, buf), buf); |
3448 | chan->num_conf_req++; | |
e9aeb2dd GP |
3449 | } |
3450 | ||
1da177e4 LT |
3451 | return 0; |
3452 | } | |
3453 | ||
3454 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3455 | { | |
3456 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3457 | u16 scid, dcid, result, status; | |
48454079 | 3458 | struct l2cap_chan *chan; |
1da177e4 | 3459 | u8 req[128]; |
3df91ea2 | 3460 | int err; |
1da177e4 LT |
3461 | |
3462 | scid = __le16_to_cpu(rsp->scid); | |
3463 | dcid = __le16_to_cpu(rsp->dcid); | |
3464 | result = __le16_to_cpu(rsp->result); | |
3465 | status = __le16_to_cpu(rsp->status); | |
3466 | ||
1b009c98 AE |
3467 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3468 | dcid, scid, result, status); | |
1da177e4 | 3469 | |
3df91ea2 AE |
3470 | mutex_lock(&conn->chan_lock); |
3471 | ||
1da177e4 | 3472 | if (scid) { |
3df91ea2 AE |
3473 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3474 | if (!chan) { | |
3475 | err = -EFAULT; | |
3476 | goto unlock; | |
3477 | } | |
1da177e4 | 3478 | } else { |
3df91ea2 AE |
3479 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3480 | if (!chan) { | |
3481 | err = -EFAULT; | |
3482 | goto unlock; | |
3483 | } | |
1da177e4 LT |
3484 | } |
3485 | ||
3df91ea2 AE |
3486 | err = 0; |
3487 | ||
6be36555 | 3488 | l2cap_chan_lock(chan); |
48454079 | 3489 | |
1da177e4 LT |
3490 | switch (result) { |
3491 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3492 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3493 | chan->ident = 0; |
fe4128e0 | 3494 | chan->dcid = dcid; |
c1360a1c | 3495 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3496 | |
c1360a1c | 3497 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3498 | break; |
3499 | ||
1da177e4 | 3500 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3501 | l2cap_build_conf_req(chan, req), req); |
3502 | chan->num_conf_req++; | |
1da177e4 LT |
3503 | break; |
3504 | ||
3505 | case L2CAP_CR_PEND: | |
c1360a1c | 3506 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3507 | break; |
3508 | ||
3509 | default: | |
48454079 | 3510 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3511 | break; |
3512 | } | |
3513 | ||
6be36555 | 3514 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3515 | |
3516 | unlock: | |
3517 | mutex_unlock(&conn->chan_lock); | |
3518 | ||
3519 | return err; | |
1da177e4 LT |
3520 | } |
3521 | ||
47d1ec61 | 3522 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3523 | { |
3524 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3525 | * sides request it. | |
3526 | */ | |
0c1bc5c6 | 3527 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3528 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3529 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3530 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3531 | } |
3532 | ||
88219a0f | 3533 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3534 | { |
3535 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3536 | u16 dcid, flags; | |
3537 | u8 rsp[64]; | |
48454079 | 3538 | struct l2cap_chan *chan; |
3c588192 | 3539 | int len, err = 0; |
1da177e4 LT |
3540 | |
3541 | dcid = __le16_to_cpu(req->dcid); | |
3542 | flags = __le16_to_cpu(req->flags); | |
3543 | ||
3544 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3545 | ||
baa7e1fa | 3546 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3547 | if (!chan) |
1da177e4 LT |
3548 | return -ENOENT; |
3549 | ||
033b1142 | 3550 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3551 | struct l2cap_cmd_rej_cid rej; |
3552 | ||
ac73498c | 3553 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3554 | rej.scid = cpu_to_le16(chan->scid); |
3555 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3556 | |
df6bd743 GP |
3557 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3558 | sizeof(rej), &rej); | |
354f60a9 | 3559 | goto unlock; |
df6bd743 | 3560 | } |
354f60a9 | 3561 | |
5dee9e7c | 3562 | /* Reject if config buffer is too small. */ |
88219a0f | 3563 | len = cmd_len - sizeof(*req); |
7ac28817 | 3564 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3565 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3566 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3567 | L2CAP_CONF_REJECT, flags), rsp); |
3568 | goto unlock; | |
3569 | } | |
3570 | ||
3571 | /* Store config. */ | |
73ffa904 GP |
3572 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3573 | chan->conf_len += len; | |
1da177e4 | 3574 | |
59e54bd1 | 3575 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3576 | /* Incomplete config. Send empty response. */ |
3577 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3578 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3579 | L2CAP_CONF_SUCCESS, flags), rsp); |
1da177e4 LT |
3580 | goto unlock; |
3581 | } | |
3582 | ||
3583 | /* Complete config. */ | |
73ffa904 | 3584 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3585 | if (len < 0) { |
e92c8e70 | 3586 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3587 | goto unlock; |
f2fcfcd6 | 3588 | } |
1da177e4 | 3589 | |
5dee9e7c | 3590 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3591 | chan->num_conf_rsp++; |
5dee9e7c | 3592 | |
5dee9e7c | 3593 | /* Reset config buffer. */ |
73ffa904 | 3594 | chan->conf_len = 0; |
5dee9e7c | 3595 | |
c1360a1c | 3596 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3597 | goto unlock; |
3598 | ||
c1360a1c | 3599 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3600 | set_default_fcs(chan); |
fcc203c3 | 3601 | |
105bdf9e MM |
3602 | if (chan->mode == L2CAP_MODE_ERTM || |
3603 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3604 | err = l2cap_ertm_init(chan); |
3605 | ||
3606 | if (err < 0) | |
3607 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3608 | else | |
3609 | l2cap_chan_ready(chan); | |
0565c1c2 | 3610 | |
876d9484 MH |
3611 | goto unlock; |
3612 | } | |
3613 | ||
c1360a1c | 3614 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3615 | u8 buf[64]; |
1da177e4 | 3616 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3617 | l2cap_build_conf_req(chan, buf), buf); |
3618 | chan->num_conf_req++; | |
1da177e4 LT |
3619 | } |
3620 | ||
0e8b207e AE |
3621 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3622 | Conf Rsp PENDING in the code above */ | |
3623 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3624 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3625 | ||
3626 | /* check compatibility */ | |
3627 | ||
3628 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3629 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3630 | ||
3631 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3632 | l2cap_build_conf_rsp(chan, rsp, |
5325e5bb | 3633 | L2CAP_CONF_SUCCESS, flags), rsp); |
0e8b207e AE |
3634 | } |
3635 | ||
1da177e4 | 3636 | unlock: |
6be36555 | 3637 | l2cap_chan_unlock(chan); |
3c588192 | 3638 | return err; |
1da177e4 LT |
3639 | } |
3640 | ||
3641 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3642 | { | |
3643 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3644 | u16 scid, flags, result; | |
48454079 | 3645 | struct l2cap_chan *chan; |
61386cba | 3646 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3647 | int err = 0; |
1da177e4 LT |
3648 | |
3649 | scid = __le16_to_cpu(rsp->scid); | |
3650 | flags = __le16_to_cpu(rsp->flags); | |
3651 | result = __le16_to_cpu(rsp->result); | |
3652 | ||
61386cba AE |
3653 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3654 | result, len); | |
1da177e4 | 3655 | |
baa7e1fa | 3656 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3657 | if (!chan) |
1da177e4 LT |
3658 | return 0; |
3659 | ||
3660 | switch (result) { | |
3661 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3662 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3663 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3664 | break; |
3665 | ||
0e8b207e AE |
3666 | case L2CAP_CONF_PENDING: |
3667 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3668 | ||
3669 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3670 | char buf[64]; | |
3671 | ||
3672 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3673 | buf, &result); | |
3674 | if (len < 0) { | |
3675 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3676 | goto done; | |
3677 | } | |
3678 | ||
3679 | /* check compatibility */ | |
3680 | ||
3681 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3682 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3683 | ||
3684 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3685 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3686 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3687 | } | |
3688 | goto done; | |
3689 | ||
1da177e4 | 3690 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3691 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3692 | char req[64]; |
3693 | ||
c2c77ec8 | 3694 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3695 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3696 | goto done; |
3697 | } | |
3698 | ||
f2fcfcd6 GP |
3699 | /* throw out any old stored conf requests */ |
3700 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3701 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3702 | req, &result); | |
f2fcfcd6 | 3703 | if (len < 0) { |
e92c8e70 | 3704 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3705 | goto done; |
3706 | } | |
3707 | ||
3708 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3709 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3710 | chan->num_conf_req++; |
f2fcfcd6 GP |
3711 | if (result != L2CAP_CONF_SUCCESS) |
3712 | goto done; | |
3713 | break; | |
1da177e4 LT |
3714 | } |
3715 | ||
8e87d142 | 3716 | default: |
6be36555 | 3717 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3718 | |
ba13ccd9 | 3719 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3720 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3721 | goto done; |
3722 | } | |
3723 | ||
59e54bd1 | 3724 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3725 | goto done; |
3726 | ||
c1360a1c | 3727 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3728 | |
c1360a1c | 3729 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3730 | set_default_fcs(chan); |
fcc203c3 | 3731 | |
105bdf9e MM |
3732 | if (chan->mode == L2CAP_MODE_ERTM || |
3733 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3734 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3735 | |
3c588192 MM |
3736 | if (err < 0) |
3737 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3738 | else | |
3739 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3740 | } |
3741 | ||
3742 | done: | |
6be36555 | 3743 | l2cap_chan_unlock(chan); |
3c588192 | 3744 | return err; |
1da177e4 LT |
3745 | } |
3746 | ||
3747 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3748 | { | |
3749 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3750 | struct l2cap_disconn_rsp rsp; | |
3751 | u16 dcid, scid; | |
48454079 | 3752 | struct l2cap_chan *chan; |
1da177e4 LT |
3753 | struct sock *sk; |
3754 | ||
3755 | scid = __le16_to_cpu(req->scid); | |
3756 | dcid = __le16_to_cpu(req->dcid); | |
3757 | ||
3758 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3759 | ||
3df91ea2 AE |
3760 | mutex_lock(&conn->chan_lock); |
3761 | ||
3762 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3763 | if (!chan) { | |
3764 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3765 | return 0; |
3df91ea2 | 3766 | } |
1da177e4 | 3767 | |
6be36555 AE |
3768 | l2cap_chan_lock(chan); |
3769 | ||
48454079 GP |
3770 | sk = chan->sk; |
3771 | ||
fe4128e0 GP |
3772 | rsp.dcid = cpu_to_le16(chan->scid); |
3773 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3774 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3775 | ||
6be36555 | 3776 | lock_sock(sk); |
1da177e4 | 3777 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3778 | release_sock(sk); |
1da177e4 | 3779 | |
61d6ef3e | 3780 | l2cap_chan_hold(chan); |
48454079 | 3781 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3782 | |
3783 | l2cap_chan_unlock(chan); | |
1da177e4 | 3784 | |
80b98027 | 3785 | chan->ops->close(chan); |
61d6ef3e | 3786 | l2cap_chan_put(chan); |
3df91ea2 AE |
3787 | |
3788 | mutex_unlock(&conn->chan_lock); | |
3789 | ||
1da177e4 LT |
3790 | return 0; |
3791 | } | |
3792 | ||
3793 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3794 | { | |
3795 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3796 | u16 dcid, scid; | |
48454079 | 3797 | struct l2cap_chan *chan; |
1da177e4 LT |
3798 | |
3799 | scid = __le16_to_cpu(rsp->scid); | |
3800 | dcid = __le16_to_cpu(rsp->dcid); | |
3801 | ||
3802 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3803 | ||
3df91ea2 AE |
3804 | mutex_lock(&conn->chan_lock); |
3805 | ||
3806 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3807 | if (!chan) { | |
3808 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3809 | return 0; |
3df91ea2 | 3810 | } |
1da177e4 | 3811 | |
6be36555 | 3812 | l2cap_chan_lock(chan); |
48454079 | 3813 | |
61d6ef3e | 3814 | l2cap_chan_hold(chan); |
48454079 | 3815 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3816 | |
3817 | l2cap_chan_unlock(chan); | |
1da177e4 | 3818 | |
80b98027 | 3819 | chan->ops->close(chan); |
61d6ef3e | 3820 | l2cap_chan_put(chan); |
3df91ea2 AE |
3821 | |
3822 | mutex_unlock(&conn->chan_lock); | |
3823 | ||
1da177e4 LT |
3824 | return 0; |
3825 | } | |
3826 | ||
3827 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3828 | { | |
3829 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3830 | u16 type; |
3831 | ||
3832 | type = __le16_to_cpu(req->type); | |
3833 | ||
3834 | BT_DBG("type 0x%4.4x", type); | |
3835 | ||
f0709e03 MH |
3836 | if (type == L2CAP_IT_FEAT_MASK) { |
3837 | u8 buf[8]; | |
44dd46de | 3838 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 3839 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
3840 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
3841 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3842 | if (!disable_ertm) |
fcc203c3 GP |
3843 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3844 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3845 | if (enable_hs) |
6327eb98 AE |
3846 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3847 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3848 | |
1b7bf4ed | 3849 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3850 | l2cap_send_cmd(conn, cmd->ident, |
3851 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3852 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3853 | u8 buf[12]; | |
3854 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3855 | |
3856 | if (enable_hs) | |
3857 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3858 | else | |
3859 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3860 | ||
ac73498c AE |
3861 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3862 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3863 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3864 | l2cap_send_cmd(conn, cmd->ident, |
3865 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3866 | } else { |
3867 | struct l2cap_info_rsp rsp; | |
3868 | rsp.type = cpu_to_le16(type); | |
ac73498c | 3869 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
f0709e03 MH |
3870 | l2cap_send_cmd(conn, cmd->ident, |
3871 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3872 | } | |
1da177e4 LT |
3873 | |
3874 | return 0; | |
3875 | } | |
3876 | ||
3877 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3878 | { | |
3879 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3880 | u16 type, result; | |
3881 | ||
3882 | type = __le16_to_cpu(rsp->type); | |
3883 | result = __le16_to_cpu(rsp->result); | |
3884 | ||
3885 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3886 | ||
e90165be AE |
3887 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3888 | if (cmd->ident != conn->info_ident || | |
3889 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3890 | return 0; | |
3891 | ||
17cd3f37 | 3892 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3893 | |
adb08ede VT |
3894 | if (result != L2CAP_IR_SUCCESS) { |
3895 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3896 | conn->info_ident = 0; | |
3897 | ||
3898 | l2cap_conn_start(conn); | |
3899 | ||
3900 | return 0; | |
3901 | } | |
3902 | ||
978c93b9 AE |
3903 | switch (type) { |
3904 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3905 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3906 | |
47ec1dcd | 3907 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 3908 | struct l2cap_info_req req; |
ac73498c | 3909 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
3910 | |
3911 | conn->info_ident = l2cap_get_ident(conn); | |
3912 | ||
3913 | l2cap_send_cmd(conn, conn->info_ident, | |
3914 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3915 | } else { | |
3916 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3917 | conn->info_ident = 0; | |
3918 | ||
3919 | l2cap_conn_start(conn); | |
3920 | } | |
978c93b9 AE |
3921 | break; |
3922 | ||
3923 | case L2CAP_IT_FIXED_CHAN: | |
3924 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3925 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3926 | conn->info_ident = 0; |
984947dc MH |
3927 | |
3928 | l2cap_conn_start(conn); | |
978c93b9 | 3929 | break; |
984947dc | 3930 | } |
4e8402a3 | 3931 | |
1da177e4 LT |
3932 | return 0; |
3933 | } | |
3934 | ||
f94ff6ff MM |
3935 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3936 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3937 | void *data) | |
3938 | { | |
3939 | struct l2cap_create_chan_req *req = data; | |
3940 | struct l2cap_create_chan_rsp rsp; | |
3941 | u16 psm, scid; | |
3942 | ||
3943 | if (cmd_len != sizeof(*req)) | |
3944 | return -EPROTO; | |
3945 | ||
3946 | if (!enable_hs) | |
3947 | return -EINVAL; | |
3948 | ||
3949 | psm = le16_to_cpu(req->psm); | |
3950 | scid = le16_to_cpu(req->scid); | |
3951 | ||
ad0ac6ca | 3952 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff MM |
3953 | |
3954 | /* Placeholder: Always reject */ | |
3955 | rsp.dcid = 0; | |
3956 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3957 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3958 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3959 | |
3960 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3961 | sizeof(rsp), &rsp); | |
3962 | ||
3963 | return 0; | |
3964 | } | |
3965 | ||
3966 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3967 | struct l2cap_cmd_hdr *cmd, void *data) | |
3968 | { | |
3969 | BT_DBG("conn %p", conn); | |
3970 | ||
3971 | return l2cap_connect_rsp(conn, cmd, data); | |
3972 | } | |
3973 | ||
8d5a04a1 | 3974 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
ad0ac6ca | 3975 | u16 icid, u16 result) |
8d5a04a1 MM |
3976 | { |
3977 | struct l2cap_move_chan_rsp rsp; | |
3978 | ||
ad0ac6ca | 3979 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
3980 | |
3981 | rsp.icid = cpu_to_le16(icid); | |
3982 | rsp.result = cpu_to_le16(result); | |
3983 | ||
3984 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3985 | } | |
3986 | ||
3987 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
3988 | struct l2cap_chan *chan, |
3989 | u16 icid, u16 result) | |
8d5a04a1 MM |
3990 | { |
3991 | struct l2cap_move_chan_cfm cfm; | |
3992 | u8 ident; | |
3993 | ||
ad0ac6ca | 3994 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
3995 | |
3996 | ident = l2cap_get_ident(conn); | |
3997 | if (chan) | |
3998 | chan->ident = ident; | |
3999 | ||
4000 | cfm.icid = cpu_to_le16(icid); | |
4001 | cfm.result = cpu_to_le16(result); | |
4002 | ||
4003 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
4004 | } | |
4005 | ||
4006 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4007 | u16 icid) |
8d5a04a1 MM |
4008 | { |
4009 | struct l2cap_move_chan_cfm_rsp rsp; | |
4010 | ||
ad0ac6ca | 4011 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4012 | |
4013 | rsp.icid = cpu_to_le16(icid); | |
4014 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4015 | } | |
4016 | ||
4017 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4018 | struct l2cap_cmd_hdr *cmd, |
4019 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4020 | { |
4021 | struct l2cap_move_chan_req *req = data; | |
4022 | u16 icid = 0; | |
4023 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4024 | ||
4025 | if (cmd_len != sizeof(*req)) | |
4026 | return -EPROTO; | |
4027 | ||
4028 | icid = le16_to_cpu(req->icid); | |
4029 | ||
ad0ac6ca | 4030 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4031 | |
4032 | if (!enable_hs) | |
4033 | return -EINVAL; | |
4034 | ||
4035 | /* Placeholder: Always refuse */ | |
4036 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
4037 | ||
4038 | return 0; | |
4039 | } | |
4040 | ||
4041 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4042 | struct l2cap_cmd_hdr *cmd, |
4043 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4044 | { |
4045 | struct l2cap_move_chan_rsp *rsp = data; | |
4046 | u16 icid, result; | |
4047 | ||
4048 | if (cmd_len != sizeof(*rsp)) | |
4049 | return -EPROTO; | |
4050 | ||
4051 | icid = le16_to_cpu(rsp->icid); | |
4052 | result = le16_to_cpu(rsp->result); | |
4053 | ||
ad0ac6ca | 4054 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4055 | |
4056 | /* Placeholder: Always unconfirmed */ | |
4057 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
4058 | ||
4059 | return 0; | |
4060 | } | |
4061 | ||
4062 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4063 | struct l2cap_cmd_hdr *cmd, |
4064 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4065 | { |
4066 | struct l2cap_move_chan_cfm *cfm = data; | |
4067 | u16 icid, result; | |
4068 | ||
4069 | if (cmd_len != sizeof(*cfm)) | |
4070 | return -EPROTO; | |
4071 | ||
4072 | icid = le16_to_cpu(cfm->icid); | |
4073 | result = le16_to_cpu(cfm->result); | |
4074 | ||
ad0ac6ca | 4075 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 MM |
4076 | |
4077 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4078 | ||
4079 | return 0; | |
4080 | } | |
4081 | ||
4082 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4083 | struct l2cap_cmd_hdr *cmd, |
4084 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4085 | { |
4086 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
4087 | u16 icid; | |
4088 | ||
4089 | if (cmd_len != sizeof(*rsp)) | |
4090 | return -EPROTO; | |
4091 | ||
4092 | icid = le16_to_cpu(rsp->icid); | |
4093 | ||
ad0ac6ca | 4094 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4095 | |
4096 | return 0; | |
4097 | } | |
4098 | ||
e2174ca4 | 4099 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
4100 | u16 to_multiplier) |
4101 | { | |
4102 | u16 max_latency; | |
4103 | ||
4104 | if (min > max || min < 6 || max > 3200) | |
4105 | return -EINVAL; | |
4106 | ||
4107 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4108 | return -EINVAL; | |
4109 | ||
4110 | if (max >= to_multiplier * 8) | |
4111 | return -EINVAL; | |
4112 | ||
4113 | max_latency = (to_multiplier * 8 / max) - 1; | |
4114 | if (latency > 499 || latency > max_latency) | |
4115 | return -EINVAL; | |
4116 | ||
4117 | return 0; | |
4118 | } | |
4119 | ||
4120 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
4121 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4122 | { | |
4123 | struct hci_conn *hcon = conn->hcon; | |
4124 | struct l2cap_conn_param_update_req *req; | |
4125 | struct l2cap_conn_param_update_rsp rsp; | |
4126 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4127 | int err; |
de73115a CT |
4128 | |
4129 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4130 | return -EINVAL; | |
4131 | ||
4132 | cmd_len = __le16_to_cpu(cmd->len); | |
4133 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4134 | return -EPROTO; | |
4135 | ||
4136 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4137 | min = __le16_to_cpu(req->min); |
4138 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4139 | latency = __le16_to_cpu(req->latency); |
4140 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4141 | ||
4142 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
4143 | min, max, latency, to_multiplier); | |
4144 | ||
4145 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4146 | |
4147 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4148 | if (err) | |
ac73498c | 4149 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4150 | else |
ac73498c | 4151 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4152 | |
4153 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
4154 | sizeof(rsp), &rsp); | |
4155 | ||
2ce603eb CT |
4156 | if (!err) |
4157 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4158 | ||
de73115a CT |
4159 | return 0; |
4160 | } | |
4161 | ||
3300d9a9 CT |
4162 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
4163 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
4164 | { | |
4165 | int err = 0; | |
4166 | ||
4167 | switch (cmd->code) { | |
4168 | case L2CAP_COMMAND_REJ: | |
4169 | l2cap_command_rej(conn, cmd, data); | |
4170 | break; | |
4171 | ||
4172 | case L2CAP_CONN_REQ: | |
4173 | err = l2cap_connect_req(conn, cmd, data); | |
4174 | break; | |
4175 | ||
4176 | case L2CAP_CONN_RSP: | |
4177 | err = l2cap_connect_rsp(conn, cmd, data); | |
4178 | break; | |
4179 | ||
4180 | case L2CAP_CONF_REQ: | |
4181 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4182 | break; | |
4183 | ||
4184 | case L2CAP_CONF_RSP: | |
4185 | err = l2cap_config_rsp(conn, cmd, data); | |
4186 | break; | |
4187 | ||
4188 | case L2CAP_DISCONN_REQ: | |
4189 | err = l2cap_disconnect_req(conn, cmd, data); | |
4190 | break; | |
4191 | ||
4192 | case L2CAP_DISCONN_RSP: | |
4193 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4194 | break; | |
4195 | ||
4196 | case L2CAP_ECHO_REQ: | |
4197 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4198 | break; | |
4199 | ||
4200 | case L2CAP_ECHO_RSP: | |
4201 | break; | |
4202 | ||
4203 | case L2CAP_INFO_REQ: | |
4204 | err = l2cap_information_req(conn, cmd, data); | |
4205 | break; | |
4206 | ||
4207 | case L2CAP_INFO_RSP: | |
4208 | err = l2cap_information_rsp(conn, cmd, data); | |
4209 | break; | |
4210 | ||
f94ff6ff MM |
4211 | case L2CAP_CREATE_CHAN_REQ: |
4212 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4213 | break; | |
4214 | ||
4215 | case L2CAP_CREATE_CHAN_RSP: | |
4216 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
4217 | break; | |
4218 | ||
8d5a04a1 MM |
4219 | case L2CAP_MOVE_CHAN_REQ: |
4220 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4221 | break; | |
4222 | ||
4223 | case L2CAP_MOVE_CHAN_RSP: | |
4224 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4225 | break; | |
4226 | ||
4227 | case L2CAP_MOVE_CHAN_CFM: | |
4228 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4229 | break; | |
4230 | ||
4231 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4232 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4233 | break; | |
4234 | ||
3300d9a9 CT |
4235 | default: |
4236 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4237 | err = -EINVAL; | |
4238 | break; | |
4239 | } | |
4240 | ||
4241 | return err; | |
4242 | } | |
4243 | ||
4244 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
4245 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4246 | { | |
4247 | switch (cmd->code) { | |
4248 | case L2CAP_COMMAND_REJ: | |
4249 | return 0; | |
4250 | ||
4251 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4252 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
4253 | |
4254 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
4255 | return 0; | |
4256 | ||
4257 | default: | |
4258 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
4259 | return -EINVAL; | |
4260 | } | |
4261 | } | |
4262 | ||
4263 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
4264 | struct sk_buff *skb) | |
1da177e4 LT |
4265 | { |
4266 | u8 *data = skb->data; | |
4267 | int len = skb->len; | |
4268 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 4269 | int err; |
1da177e4 LT |
4270 | |
4271 | l2cap_raw_recv(conn, skb); | |
4272 | ||
4273 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 4274 | u16 cmd_len; |
1da177e4 LT |
4275 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
4276 | data += L2CAP_CMD_HDR_SIZE; | |
4277 | len -= L2CAP_CMD_HDR_SIZE; | |
4278 | ||
88219a0f | 4279 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 4280 | |
88219a0f | 4281 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 4282 | |
88219a0f | 4283 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
4284 | BT_DBG("corrupted command"); |
4285 | break; | |
4286 | } | |
4287 | ||
3300d9a9 CT |
4288 | if (conn->hcon->type == LE_LINK) |
4289 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
4290 | else | |
4291 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
4292 | |
4293 | if (err) { | |
e2fd318e | 4294 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
4295 | |
4296 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
4297 | |
4298 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 4299 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
4300 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
4301 | } | |
4302 | ||
88219a0f AV |
4303 | data += cmd_len; |
4304 | len -= cmd_len; | |
1da177e4 LT |
4305 | } |
4306 | ||
4307 | kfree_skb(skb); | |
4308 | } | |
4309 | ||
47d1ec61 | 4310 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
4311 | { |
4312 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
4313 | int hdr_size; |
4314 | ||
4315 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
4316 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
4317 | else | |
4318 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 4319 | |
47d1ec61 | 4320 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 4321 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
4322 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
4323 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
4324 | ||
4325 | if (our_fcs != rcv_fcs) | |
7a560e5c | 4326 | return -EBADMSG; |
fcc203c3 GP |
4327 | } |
4328 | return 0; | |
4329 | } | |
4330 | ||
6ea00485 | 4331 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 4332 | { |
e31f7633 | 4333 | struct l2cap_ctrl control; |
d5392c8f | 4334 | |
e31f7633 | 4335 | BT_DBG("chan %p", chan); |
d5392c8f | 4336 | |
e31f7633 MM |
4337 | memset(&control, 0, sizeof(control)); |
4338 | control.sframe = 1; | |
4339 | control.final = 1; | |
4340 | control.reqseq = chan->buffer_seq; | |
4341 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 4342 | |
e2ab4353 | 4343 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
4344 | control.super = L2CAP_SUPER_RNR; |
4345 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4346 | } |
4347 | ||
e31f7633 MM |
4348 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
4349 | chan->unacked_frames > 0) | |
4350 | __set_retrans_timer(chan); | |
d5392c8f | 4351 | |
e31f7633 | 4352 | /* Send pending iframes */ |
525cd185 | 4353 | l2cap_ertm_send(chan); |
d5392c8f | 4354 | |
e2ab4353 | 4355 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
4356 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
4357 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
4358 | * send it now. | |
4359 | */ | |
4360 | control.super = L2CAP_SUPER_RR; | |
4361 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
4362 | } |
4363 | } | |
4364 | ||
84084a31 MM |
4365 | static void append_skb_frag(struct sk_buff *skb, |
4366 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4367 | { |
84084a31 MM |
4368 | /* skb->len reflects data in skb as well as all fragments |
4369 | * skb->data_len reflects only data in fragments | |
4370 | */ | |
4371 | if (!skb_has_frag_list(skb)) | |
4372 | skb_shinfo(skb)->frag_list = new_frag; | |
4373 | ||
4374 | new_frag->next = NULL; | |
4375 | ||
4376 | (*last_frag)->next = new_frag; | |
4377 | *last_frag = new_frag; | |
4378 | ||
4379 | skb->len += new_frag->len; | |
4380 | skb->data_len += new_frag->len; | |
4381 | skb->truesize += new_frag->truesize; | |
4382 | } | |
4383 | ||
4b51dae9 MM |
4384 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
4385 | struct l2cap_ctrl *control) | |
84084a31 MM |
4386 | { |
4387 | int err = -EINVAL; | |
18778a63 | 4388 | |
4b51dae9 | 4389 | switch (control->sar) { |
7e0ef6ee | 4390 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
4391 | if (chan->sdu) |
4392 | break; | |
18778a63 | 4393 | |
80b98027 | 4394 | err = chan->ops->recv(chan, skb); |
84084a31 | 4395 | break; |
18778a63 | 4396 | |
7e0ef6ee | 4397 | case L2CAP_SAR_START: |
84084a31 MM |
4398 | if (chan->sdu) |
4399 | break; | |
18778a63 | 4400 | |
6f61fd47 | 4401 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4402 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4403 | |
84084a31 MM |
4404 | if (chan->sdu_len > chan->imtu) { |
4405 | err = -EMSGSIZE; | |
4406 | break; | |
4407 | } | |
1890d36b | 4408 | |
84084a31 MM |
4409 | if (skb->len >= chan->sdu_len) |
4410 | break; | |
18778a63 | 4411 | |
84084a31 MM |
4412 | chan->sdu = skb; |
4413 | chan->sdu_last_frag = skb; | |
18778a63 | 4414 | |
84084a31 MM |
4415 | skb = NULL; |
4416 | err = 0; | |
18778a63 GP |
4417 | break; |
4418 | ||
7e0ef6ee | 4419 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4420 | if (!chan->sdu) |
84084a31 | 4421 | break; |
18778a63 | 4422 | |
84084a31 MM |
4423 | append_skb_frag(chan->sdu, skb, |
4424 | &chan->sdu_last_frag); | |
4425 | skb = NULL; | |
18778a63 | 4426 | |
84084a31 MM |
4427 | if (chan->sdu->len >= chan->sdu_len) |
4428 | break; | |
4178ba46 | 4429 | |
84084a31 | 4430 | err = 0; |
18778a63 GP |
4431 | break; |
4432 | ||
7e0ef6ee | 4433 | case L2CAP_SAR_END: |
6f61fd47 | 4434 | if (!chan->sdu) |
84084a31 | 4435 | break; |
18778a63 | 4436 | |
84084a31 MM |
4437 | append_skb_frag(chan->sdu, skb, |
4438 | &chan->sdu_last_frag); | |
4439 | skb = NULL; | |
4178ba46 | 4440 | |
84084a31 MM |
4441 | if (chan->sdu->len != chan->sdu_len) |
4442 | break; | |
18778a63 | 4443 | |
80b98027 | 4444 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 4445 | |
84084a31 MM |
4446 | if (!err) { |
4447 | /* Reassembly complete */ | |
4448 | chan->sdu = NULL; | |
4449 | chan->sdu_last_frag = NULL; | |
4450 | chan->sdu_len = 0; | |
1890d36b | 4451 | } |
18778a63 GP |
4452 | break; |
4453 | } | |
4454 | ||
84084a31 MM |
4455 | if (err) { |
4456 | kfree_skb(skb); | |
4457 | kfree_skb(chan->sdu); | |
4458 | chan->sdu = NULL; | |
4459 | chan->sdu_last_frag = NULL; | |
4460 | chan->sdu_len = 0; | |
4461 | } | |
18778a63 | 4462 | |
84084a31 | 4463 | return err; |
18778a63 GP |
4464 | } |
4465 | ||
61aa4f5b | 4466 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 4467 | { |
61aa4f5b | 4468 | u8 event; |
712132eb | 4469 | |
61aa4f5b MM |
4470 | if (chan->mode != L2CAP_MODE_ERTM) |
4471 | return; | |
712132eb | 4472 | |
61aa4f5b | 4473 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 4474 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
4475 | } |
4476 | ||
d2a7ac5d MM |
4477 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
4478 | { | |
63838725 MM |
4479 | int err = 0; |
4480 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
4481 | * until a gap is encountered. | |
4482 | */ | |
4483 | ||
4484 | BT_DBG("chan %p", chan); | |
4485 | ||
4486 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4487 | struct sk_buff *skb; | |
4488 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
4489 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
4490 | ||
4491 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
4492 | ||
4493 | if (!skb) | |
4494 | break; | |
4495 | ||
4496 | skb_unlink(skb, &chan->srej_q); | |
4497 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
4498 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
4499 | if (err) | |
4500 | break; | |
4501 | } | |
4502 | ||
4503 | if (skb_queue_empty(&chan->srej_q)) { | |
4504 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
4505 | l2cap_send_ack(chan); | |
4506 | } | |
4507 | ||
4508 | return err; | |
d2a7ac5d MM |
4509 | } |
4510 | ||
4511 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
4512 | struct l2cap_ctrl *control) | |
4513 | { | |
f80842a8 MM |
4514 | struct sk_buff *skb; |
4515 | ||
4516 | BT_DBG("chan %p, control %p", chan, control); | |
4517 | ||
4518 | if (control->reqseq == chan->next_tx_seq) { | |
4519 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4520 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4521 | return; | |
4522 | } | |
4523 | ||
4524 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4525 | ||
4526 | if (skb == NULL) { | |
4527 | BT_DBG("Seq %d not available for retransmission", | |
4528 | control->reqseq); | |
4529 | return; | |
4530 | } | |
4531 | ||
4532 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
4533 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4534 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4535 | return; | |
4536 | } | |
4537 | ||
4538 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4539 | ||
4540 | if (control->poll) { | |
4541 | l2cap_pass_to_tx(chan, control); | |
4542 | ||
4543 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4544 | l2cap_retransmit(chan, control); | |
4545 | l2cap_ertm_send(chan); | |
4546 | ||
4547 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4548 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4549 | chan->srej_save_reqseq = control->reqseq; | |
4550 | } | |
4551 | } else { | |
4552 | l2cap_pass_to_tx_fbit(chan, control); | |
4553 | ||
4554 | if (control->final) { | |
4555 | if (chan->srej_save_reqseq != control->reqseq || | |
4556 | !test_and_clear_bit(CONN_SREJ_ACT, | |
4557 | &chan->conn_state)) | |
4558 | l2cap_retransmit(chan, control); | |
4559 | } else { | |
4560 | l2cap_retransmit(chan, control); | |
4561 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
4562 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4563 | chan->srej_save_reqseq = control->reqseq; | |
4564 | } | |
4565 | } | |
4566 | } | |
d2a7ac5d MM |
4567 | } |
4568 | ||
4569 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
4570 | struct l2cap_ctrl *control) | |
4571 | { | |
fcd289df MM |
4572 | struct sk_buff *skb; |
4573 | ||
4574 | BT_DBG("chan %p, control %p", chan, control); | |
4575 | ||
4576 | if (control->reqseq == chan->next_tx_seq) { | |
4577 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
4578 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4579 | return; | |
4580 | } | |
4581 | ||
4582 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
4583 | ||
4584 | if (chan->max_tx && skb && | |
4585 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
4586 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
4587 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4588 | return; | |
4589 | } | |
4590 | ||
4591 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4592 | ||
4593 | l2cap_pass_to_tx(chan, control); | |
4594 | ||
4595 | if (control->final) { | |
4596 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
4597 | l2cap_retransmit_all(chan, control); | |
4598 | } else { | |
4599 | l2cap_retransmit_all(chan, control); | |
4600 | l2cap_ertm_send(chan); | |
4601 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
4602 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
4603 | } | |
d2a7ac5d MM |
4604 | } |
4605 | ||
4b51dae9 MM |
4606 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
4607 | { | |
4608 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
4609 | ||
4610 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
4611 | chan->expected_tx_seq); | |
4612 | ||
4613 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
4614 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4615 | chan->tx_win) { | |
4616 | /* See notes below regarding "double poll" and | |
4617 | * invalid packets. | |
4618 | */ | |
4619 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4620 | BT_DBG("Invalid/Ignore - after SREJ"); | |
4621 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4622 | } else { | |
4623 | BT_DBG("Invalid - in window after SREJ sent"); | |
4624 | return L2CAP_TXSEQ_INVALID; | |
4625 | } | |
4626 | } | |
4627 | ||
4628 | if (chan->srej_list.head == txseq) { | |
4629 | BT_DBG("Expected SREJ"); | |
4630 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
4631 | } | |
4632 | ||
4633 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
4634 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
4635 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
4636 | } | |
4637 | ||
4638 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
4639 | BT_DBG("Unexpected SREJ - not requested"); | |
4640 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
4641 | } | |
4642 | } | |
4643 | ||
4644 | if (chan->expected_tx_seq == txseq) { | |
4645 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
4646 | chan->tx_win) { | |
4647 | BT_DBG("Invalid - txseq outside tx window"); | |
4648 | return L2CAP_TXSEQ_INVALID; | |
4649 | } else { | |
4650 | BT_DBG("Expected"); | |
4651 | return L2CAP_TXSEQ_EXPECTED; | |
4652 | } | |
4653 | } | |
4654 | ||
4655 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
4656 | __seq_offset(chan, chan->expected_tx_seq, | |
4657 | chan->last_acked_seq)){ | |
4658 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); | |
4659 | return L2CAP_TXSEQ_DUPLICATE; | |
4660 | } | |
4661 | ||
4662 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
4663 | /* A source of invalid packets is a "double poll" condition, | |
4664 | * where delays cause us to send multiple poll packets. If | |
4665 | * the remote stack receives and processes both polls, | |
4666 | * sequence numbers can wrap around in such a way that a | |
4667 | * resent frame has a sequence number that looks like new data | |
4668 | * with a sequence gap. This would trigger an erroneous SREJ | |
4669 | * request. | |
4670 | * | |
4671 | * Fortunately, this is impossible with a tx window that's | |
4672 | * less than half of the maximum sequence number, which allows | |
4673 | * invalid frames to be safely ignored. | |
4674 | * | |
4675 | * With tx window sizes greater than half of the tx window | |
4676 | * maximum, the frame is invalid and cannot be ignored. This | |
4677 | * causes a disconnect. | |
4678 | */ | |
4679 | ||
4680 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
4681 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
4682 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
4683 | } else { | |
4684 | BT_DBG("Invalid - txseq outside tx window"); | |
4685 | return L2CAP_TXSEQ_INVALID; | |
4686 | } | |
4687 | } else { | |
4688 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
4689 | return L2CAP_TXSEQ_UNEXPECTED; | |
4690 | } | |
4691 | } | |
4692 | ||
d2a7ac5d MM |
4693 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
4694 | struct l2cap_ctrl *control, | |
4695 | struct sk_buff *skb, u8 event) | |
4696 | { | |
4697 | int err = 0; | |
4698 | bool skb_in_use = 0; | |
4699 | ||
4700 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4701 | event); | |
4702 | ||
4703 | switch (event) { | |
4704 | case L2CAP_EV_RECV_IFRAME: | |
4705 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
4706 | case L2CAP_TXSEQ_EXPECTED: | |
4707 | l2cap_pass_to_tx(chan, control); | |
4708 | ||
4709 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4710 | BT_DBG("Busy, discarding expected seq %d", | |
4711 | control->txseq); | |
4712 | break; | |
4713 | } | |
4714 | ||
4715 | chan->expected_tx_seq = __next_seq(chan, | |
4716 | control->txseq); | |
4717 | ||
4718 | chan->buffer_seq = chan->expected_tx_seq; | |
4719 | skb_in_use = 1; | |
4720 | ||
4721 | err = l2cap_reassemble_sdu(chan, skb, control); | |
4722 | if (err) | |
4723 | break; | |
4724 | ||
4725 | if (control->final) { | |
4726 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4727 | &chan->conn_state)) { | |
4728 | control->final = 0; | |
4729 | l2cap_retransmit_all(chan, control); | |
4730 | l2cap_ertm_send(chan); | |
4731 | } | |
4732 | } | |
4733 | ||
4734 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
4735 | l2cap_send_ack(chan); | |
4736 | break; | |
4737 | case L2CAP_TXSEQ_UNEXPECTED: | |
4738 | l2cap_pass_to_tx(chan, control); | |
4739 | ||
4740 | /* Can't issue SREJ frames in the local busy state. | |
4741 | * Drop this frame, it will be seen as missing | |
4742 | * when local busy is exited. | |
4743 | */ | |
4744 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4745 | BT_DBG("Busy, discarding unexpected seq %d", | |
4746 | control->txseq); | |
4747 | break; | |
4748 | } | |
4749 | ||
4750 | /* There was a gap in the sequence, so an SREJ | |
4751 | * must be sent for each missing frame. The | |
4752 | * current frame is stored for later use. | |
4753 | */ | |
4754 | skb_queue_tail(&chan->srej_q, skb); | |
4755 | skb_in_use = 1; | |
4756 | BT_DBG("Queued %p (queue len %d)", skb, | |
4757 | skb_queue_len(&chan->srej_q)); | |
4758 | ||
4759 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
4760 | l2cap_seq_list_clear(&chan->srej_list); | |
4761 | l2cap_send_srej(chan, control->txseq); | |
4762 | ||
4763 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
4764 | break; | |
4765 | case L2CAP_TXSEQ_DUPLICATE: | |
4766 | l2cap_pass_to_tx(chan, control); | |
4767 | break; | |
4768 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4769 | break; | |
4770 | case L2CAP_TXSEQ_INVALID: | |
4771 | default: | |
4772 | l2cap_send_disconn_req(chan->conn, chan, | |
4773 | ECONNRESET); | |
4774 | break; | |
4775 | } | |
4776 | break; | |
4777 | case L2CAP_EV_RECV_RR: | |
4778 | l2cap_pass_to_tx(chan, control); | |
4779 | if (control->final) { | |
4780 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4781 | ||
4782 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4783 | &chan->conn_state)) { | |
4784 | control->final = 0; | |
4785 | l2cap_retransmit_all(chan, control); | |
4786 | } | |
4787 | ||
4788 | l2cap_ertm_send(chan); | |
4789 | } else if (control->poll) { | |
4790 | l2cap_send_i_or_rr_or_rnr(chan); | |
4791 | } else { | |
4792 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4793 | &chan->conn_state) && | |
4794 | chan->unacked_frames) | |
4795 | __set_retrans_timer(chan); | |
4796 | ||
4797 | l2cap_ertm_send(chan); | |
4798 | } | |
4799 | break; | |
4800 | case L2CAP_EV_RECV_RNR: | |
4801 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4802 | l2cap_pass_to_tx(chan, control); | |
4803 | if (control && control->poll) { | |
4804 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4805 | l2cap_send_rr_or_rnr(chan, 0); | |
4806 | } | |
4807 | __clear_retrans_timer(chan); | |
4808 | l2cap_seq_list_clear(&chan->retrans_list); | |
4809 | break; | |
4810 | case L2CAP_EV_RECV_REJ: | |
4811 | l2cap_handle_rej(chan, control); | |
4812 | break; | |
4813 | case L2CAP_EV_RECV_SREJ: | |
4814 | l2cap_handle_srej(chan, control); | |
4815 | break; | |
4816 | default: | |
4817 | break; | |
4818 | } | |
4819 | ||
4820 | if (skb && !skb_in_use) { | |
4821 | BT_DBG("Freeing %p", skb); | |
4822 | kfree_skb(skb); | |
4823 | } | |
4824 | ||
4825 | return err; | |
4826 | } | |
4827 | ||
4828 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
4829 | struct l2cap_ctrl *control, | |
4830 | struct sk_buff *skb, u8 event) | |
4831 | { | |
4832 | int err = 0; | |
4833 | u16 txseq = control->txseq; | |
4834 | bool skb_in_use = 0; | |
4835 | ||
4836 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
4837 | event); | |
4838 | ||
4839 | switch (event) { | |
4840 | case L2CAP_EV_RECV_IFRAME: | |
4841 | switch (l2cap_classify_txseq(chan, txseq)) { | |
4842 | case L2CAP_TXSEQ_EXPECTED: | |
4843 | /* Keep frame for reassembly later */ | |
4844 | l2cap_pass_to_tx(chan, control); | |
4845 | skb_queue_tail(&chan->srej_q, skb); | |
4846 | skb_in_use = 1; | |
4847 | BT_DBG("Queued %p (queue len %d)", skb, | |
4848 | skb_queue_len(&chan->srej_q)); | |
4849 | ||
4850 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
4851 | break; | |
4852 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
4853 | l2cap_seq_list_pop(&chan->srej_list); | |
4854 | ||
4855 | l2cap_pass_to_tx(chan, control); | |
4856 | skb_queue_tail(&chan->srej_q, skb); | |
4857 | skb_in_use = 1; | |
4858 | BT_DBG("Queued %p (queue len %d)", skb, | |
4859 | skb_queue_len(&chan->srej_q)); | |
4860 | ||
4861 | err = l2cap_rx_queued_iframes(chan); | |
4862 | if (err) | |
4863 | break; | |
4864 | ||
4865 | break; | |
4866 | case L2CAP_TXSEQ_UNEXPECTED: | |
4867 | /* Got a frame that can't be reassembled yet. | |
4868 | * Save it for later, and send SREJs to cover | |
4869 | * the missing frames. | |
4870 | */ | |
4871 | skb_queue_tail(&chan->srej_q, skb); | |
4872 | skb_in_use = 1; | |
4873 | BT_DBG("Queued %p (queue len %d)", skb, | |
4874 | skb_queue_len(&chan->srej_q)); | |
4875 | ||
4876 | l2cap_pass_to_tx(chan, control); | |
4877 | l2cap_send_srej(chan, control->txseq); | |
4878 | break; | |
4879 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
4880 | /* This frame was requested with an SREJ, but | |
4881 | * some expected retransmitted frames are | |
4882 | * missing. Request retransmission of missing | |
4883 | * SREJ'd frames. | |
4884 | */ | |
4885 | skb_queue_tail(&chan->srej_q, skb); | |
4886 | skb_in_use = 1; | |
4887 | BT_DBG("Queued %p (queue len %d)", skb, | |
4888 | skb_queue_len(&chan->srej_q)); | |
4889 | ||
4890 | l2cap_pass_to_tx(chan, control); | |
4891 | l2cap_send_srej_list(chan, control->txseq); | |
4892 | break; | |
4893 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
4894 | /* We've already queued this frame. Drop this copy. */ | |
4895 | l2cap_pass_to_tx(chan, control); | |
4896 | break; | |
4897 | case L2CAP_TXSEQ_DUPLICATE: | |
4898 | /* Expecting a later sequence number, so this frame | |
4899 | * was already received. Ignore it completely. | |
4900 | */ | |
4901 | break; | |
4902 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
4903 | break; | |
4904 | case L2CAP_TXSEQ_INVALID: | |
4905 | default: | |
4906 | l2cap_send_disconn_req(chan->conn, chan, | |
4907 | ECONNRESET); | |
4908 | break; | |
4909 | } | |
4910 | break; | |
4911 | case L2CAP_EV_RECV_RR: | |
4912 | l2cap_pass_to_tx(chan, control); | |
4913 | if (control->final) { | |
4914 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4915 | ||
4916 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
4917 | &chan->conn_state)) { | |
4918 | control->final = 0; | |
4919 | l2cap_retransmit_all(chan, control); | |
4920 | } | |
4921 | ||
4922 | l2cap_ertm_send(chan); | |
4923 | } else if (control->poll) { | |
4924 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4925 | &chan->conn_state) && | |
4926 | chan->unacked_frames) { | |
4927 | __set_retrans_timer(chan); | |
4928 | } | |
4929 | ||
4930 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
4931 | l2cap_send_srej_tail(chan); | |
4932 | } else { | |
4933 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
4934 | &chan->conn_state) && | |
4935 | chan->unacked_frames) | |
4936 | __set_retrans_timer(chan); | |
4937 | ||
4938 | l2cap_send_ack(chan); | |
4939 | } | |
4940 | break; | |
4941 | case L2CAP_EV_RECV_RNR: | |
4942 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
4943 | l2cap_pass_to_tx(chan, control); | |
4944 | if (control->poll) { | |
4945 | l2cap_send_srej_tail(chan); | |
4946 | } else { | |
4947 | struct l2cap_ctrl rr_control; | |
4948 | memset(&rr_control, 0, sizeof(rr_control)); | |
4949 | rr_control.sframe = 1; | |
4950 | rr_control.super = L2CAP_SUPER_RR; | |
4951 | rr_control.reqseq = chan->buffer_seq; | |
4952 | l2cap_send_sframe(chan, &rr_control); | |
4953 | } | |
4954 | ||
4955 | break; | |
4956 | case L2CAP_EV_RECV_REJ: | |
4957 | l2cap_handle_rej(chan, control); | |
4958 | break; | |
4959 | case L2CAP_EV_RECV_SREJ: | |
4960 | l2cap_handle_srej(chan, control); | |
4961 | break; | |
4962 | } | |
4963 | ||
4964 | if (skb && !skb_in_use) { | |
4965 | BT_DBG("Freeing %p", skb); | |
4966 | kfree_skb(skb); | |
4967 | } | |
4968 | ||
4969 | return err; | |
4970 | } | |
4971 | ||
4972 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) | |
4973 | { | |
4974 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
4975 | u16 unacked; | |
4976 | ||
4977 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
4978 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
4979 | } | |
4980 | ||
cec8ab6e MM |
4981 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
4982 | struct sk_buff *skb, u8 event) | |
218bb9df | 4983 | { |
d2a7ac5d MM |
4984 | int err = 0; |
4985 | ||
4986 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
4987 | control, skb, event, chan->rx_state); | |
4988 | ||
4989 | if (__valid_reqseq(chan, control->reqseq)) { | |
4990 | switch (chan->rx_state) { | |
4991 | case L2CAP_RX_STATE_RECV: | |
4992 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
4993 | break; | |
4994 | case L2CAP_RX_STATE_SREJ_SENT: | |
4995 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
4996 | event); | |
4997 | break; | |
4998 | default: | |
4999 | /* shut it down */ | |
5000 | break; | |
5001 | } | |
5002 | } else { | |
5003 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5004 | control->reqseq, chan->next_tx_seq, | |
5005 | chan->expected_ack_seq); | |
5006 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5007 | } | |
5008 | ||
5009 | return err; | |
cec8ab6e MM |
5010 | } |
5011 | ||
5012 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5013 | struct sk_buff *skb) | |
5014 | { | |
4b51dae9 MM |
5015 | int err = 0; |
5016 | ||
5017 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5018 | chan->rx_state); | |
5019 | ||
5020 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5021 | L2CAP_TXSEQ_EXPECTED) { | |
5022 | l2cap_pass_to_tx(chan, control); | |
5023 | ||
5024 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5025 | __next_seq(chan, chan->buffer_seq)); | |
5026 | ||
5027 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5028 | ||
5029 | l2cap_reassemble_sdu(chan, skb, control); | |
5030 | } else { | |
5031 | if (chan->sdu) { | |
5032 | kfree_skb(chan->sdu); | |
5033 | chan->sdu = NULL; | |
5034 | } | |
5035 | chan->sdu_last_frag = NULL; | |
5036 | chan->sdu_len = 0; | |
5037 | ||
5038 | if (skb) { | |
5039 | BT_DBG("Freeing %p", skb); | |
5040 | kfree_skb(skb); | |
5041 | } | |
5042 | } | |
5043 | ||
5044 | chan->last_acked_seq = control->txseq; | |
5045 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5046 | ||
5047 | return err; | |
cec8ab6e MM |
5048 | } |
5049 | ||
5050 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5051 | { | |
5052 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5053 | u16 len; | |
5054 | u8 event; | |
218bb9df | 5055 | |
b76bbd66 MM |
5056 | __unpack_control(chan, skb); |
5057 | ||
218bb9df GP |
5058 | len = skb->len; |
5059 | ||
5060 | /* | |
5061 | * We can just drop the corrupted I-frame here. | |
5062 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5063 | * procedures and ask for retransmission. |
218bb9df | 5064 | */ |
47d1ec61 | 5065 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5066 | goto drop; |
5067 | ||
cec8ab6e | 5068 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5069 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5070 | |
47d1ec61 | 5071 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5072 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5073 | |
47d1ec61 | 5074 | if (len > chan->mps) { |
8c1d787b | 5075 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5076 | goto drop; |
5077 | } | |
5078 | ||
cec8ab6e MM |
5079 | if (!control->sframe) { |
5080 | int err; | |
218bb9df | 5081 | |
cec8ab6e MM |
5082 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5083 | control->sar, control->reqseq, control->final, | |
5084 | control->txseq); | |
218bb9df | 5085 | |
cec8ab6e MM |
5086 | /* Validate F-bit - F=0 always valid, F=1 only |
5087 | * valid in TX WAIT_F | |
5088 | */ | |
5089 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5090 | goto drop; |
cec8ab6e MM |
5091 | |
5092 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5093 | event = L2CAP_EV_RECV_IFRAME; | |
5094 | err = l2cap_rx(chan, control, skb, event); | |
5095 | } else { | |
5096 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5097 | } |
5098 | ||
cec8ab6e MM |
5099 | if (err) |
5100 | l2cap_send_disconn_req(chan->conn, chan, | |
5101 | ECONNRESET); | |
218bb9df | 5102 | } else { |
cec8ab6e MM |
5103 | const u8 rx_func_to_event[4] = { |
5104 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5105 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5106 | }; | |
5107 | ||
5108 | /* Only I-frames are expected in streaming mode */ | |
5109 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5110 | goto drop; | |
5111 | ||
5112 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5113 | control->reqseq, control->final, control->poll, | |
5114 | control->super); | |
5115 | ||
218bb9df GP |
5116 | if (len != 0) { |
5117 | BT_ERR("%d", len); | |
8c1d787b | 5118 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5119 | goto drop; |
5120 | } | |
5121 | ||
cec8ab6e MM |
5122 | /* Validate F and P bits */ |
5123 | if (control->final && (control->poll || | |
5124 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5125 | goto drop; | |
5126 | ||
5127 | event = rx_func_to_event[control->super]; | |
5128 | if (l2cap_rx(chan, control, skb, event)) | |
5129 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5130 | } |
5131 | ||
5132 | return 0; | |
5133 | ||
5134 | drop: | |
5135 | kfree_skb(skb); | |
5136 | return 0; | |
5137 | } | |
5138 | ||
13ca56e0 AE |
5139 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5140 | struct sk_buff *skb) | |
1da177e4 | 5141 | { |
48454079 | 5142 | struct l2cap_chan *chan; |
1da177e4 | 5143 | |
baa7e1fa | 5144 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5145 | if (!chan) { |
97e8e89d AE |
5146 | if (cid == L2CAP_CID_A2MP) { |
5147 | chan = a2mp_channel_create(conn, skb); | |
5148 | if (!chan) { | |
5149 | kfree_skb(skb); | |
13ca56e0 | 5150 | return; |
97e8e89d AE |
5151 | } |
5152 | ||
5153 | l2cap_chan_lock(chan); | |
5154 | } else { | |
5155 | BT_DBG("unknown cid 0x%4.4x", cid); | |
5156 | /* Drop packet and return */ | |
5157 | kfree_skb(skb); | |
13ca56e0 | 5158 | return; |
97e8e89d | 5159 | } |
1da177e4 LT |
5160 | } |
5161 | ||
49208c9c | 5162 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5163 | |
89bc500e | 5164 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
5165 | goto drop; |
5166 | ||
0c1bc5c6 | 5167 | switch (chan->mode) { |
1c2acffb GP |
5168 | case L2CAP_MODE_BASIC: |
5169 | /* If socket recv buffers overflows we drop data here | |
5170 | * which is *bad* because L2CAP has to be reliable. | |
5171 | * But we don't have any other choice. L2CAP doesn't | |
5172 | * provide flow control mechanism. */ | |
1da177e4 | 5173 | |
0c1bc5c6 | 5174 | if (chan->imtu < skb->len) |
1c2acffb | 5175 | goto drop; |
1da177e4 | 5176 | |
80b98027 | 5177 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
5178 | goto done; |
5179 | break; | |
5180 | ||
5181 | case L2CAP_MODE_ERTM: | |
6840ed07 | 5182 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 5183 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
5184 | goto done; |
5185 | ||
1c2acffb | 5186 | default: |
0c1bc5c6 | 5187 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
5188 | break; |
5189 | } | |
1da177e4 LT |
5190 | |
5191 | drop: | |
5192 | kfree_skb(skb); | |
5193 | ||
5194 | done: | |
6be36555 | 5195 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5196 | } |
5197 | ||
84104b24 AE |
5198 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
5199 | struct sk_buff *skb) | |
1da177e4 | 5200 | { |
23691d75 | 5201 | struct l2cap_chan *chan; |
1da177e4 | 5202 | |
c2287681 | 5203 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 5204 | if (!chan) |
1da177e4 LT |
5205 | goto drop; |
5206 | ||
5b4cedaa | 5207 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 5208 | |
89bc500e | 5209 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
5210 | goto drop; |
5211 | ||
e13e21dc | 5212 | if (chan->imtu < skb->len) |
1da177e4 LT |
5213 | goto drop; |
5214 | ||
80b98027 | 5215 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 5216 | return; |
1da177e4 LT |
5217 | |
5218 | drop: | |
5219 | kfree_skb(skb); | |
1da177e4 LT |
5220 | } |
5221 | ||
6810fca7 AE |
5222 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
5223 | struct sk_buff *skb) | |
9f69bda6 | 5224 | { |
23691d75 | 5225 | struct l2cap_chan *chan; |
9f69bda6 | 5226 | |
c2287681 | 5227 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 5228 | if (!chan) |
9f69bda6 GP |
5229 | goto drop; |
5230 | ||
5b4cedaa | 5231 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 5232 | |
89bc500e | 5233 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
5234 | goto drop; |
5235 | ||
e13e21dc | 5236 | if (chan->imtu < skb->len) |
9f69bda6 GP |
5237 | goto drop; |
5238 | ||
80b98027 | 5239 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 5240 | return; |
9f69bda6 GP |
5241 | |
5242 | drop: | |
5243 | kfree_skb(skb); | |
9f69bda6 GP |
5244 | } |
5245 | ||
1da177e4 LT |
5246 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
5247 | { | |
5248 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
5249 | u16 cid, len; |
5250 | __le16 psm; | |
1da177e4 LT |
5251 | |
5252 | skb_pull(skb, L2CAP_HDR_SIZE); | |
5253 | cid = __le16_to_cpu(lh->cid); | |
5254 | len = __le16_to_cpu(lh->len); | |
5255 | ||
1c2acffb GP |
5256 | if (len != skb->len) { |
5257 | kfree_skb(skb); | |
5258 | return; | |
5259 | } | |
5260 | ||
1da177e4 LT |
5261 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
5262 | ||
5263 | switch (cid) { | |
3300d9a9 | 5264 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 5265 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
5266 | l2cap_sig_channel(conn, skb); |
5267 | break; | |
5268 | ||
8db4dc46 | 5269 | case L2CAP_CID_CONN_LESS: |
097db76c | 5270 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 5271 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
5272 | l2cap_conless_channel(conn, psm, skb); |
5273 | break; | |
5274 | ||
9f69bda6 GP |
5275 | case L2CAP_CID_LE_DATA: |
5276 | l2cap_att_channel(conn, cid, skb); | |
5277 | break; | |
5278 | ||
b501d6a1 AB |
5279 | case L2CAP_CID_SMP: |
5280 | if (smp_sig_channel(conn, skb)) | |
5281 | l2cap_conn_del(conn->hcon, EACCES); | |
5282 | break; | |
5283 | ||
1da177e4 LT |
5284 | default: |
5285 | l2cap_data_channel(conn, cid, skb); | |
5286 | break; | |
5287 | } | |
5288 | } | |
5289 | ||
5290 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
5291 | ||
686ebf28 | 5292 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
5293 | { |
5294 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 5295 | struct l2cap_chan *c; |
1da177e4 | 5296 | |
1da177e4 LT |
5297 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
5298 | ||
5299 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
5300 | read_lock(&chan_list_lock); |
5301 | list_for_each_entry(c, &chan_list, global_l) { | |
5302 | struct sock *sk = c->sk; | |
4343478f | 5303 | |
89bc500e | 5304 | if (c->state != BT_LISTEN) |
1da177e4 LT |
5305 | continue; |
5306 | ||
5307 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 5308 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 5309 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 5310 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 5311 | exact++; |
2af6b9d5 MH |
5312 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
5313 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 5314 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
5315 | lm2 |= HCI_LM_MASTER; |
5316 | } | |
1da177e4 | 5317 | } |
23691d75 | 5318 | read_unlock(&chan_list_lock); |
1da177e4 LT |
5319 | |
5320 | return exact ? lm1 : lm2; | |
5321 | } | |
5322 | ||
686ebf28 | 5323 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 5324 | { |
0139418c MH |
5325 | struct l2cap_conn *conn; |
5326 | ||
1da177e4 LT |
5327 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
5328 | ||
1da177e4 | 5329 | if (!status) { |
1da177e4 LT |
5330 | conn = l2cap_conn_add(hcon, status); |
5331 | if (conn) | |
5332 | l2cap_conn_ready(conn); | |
0139418c | 5333 | } else |
e175072f | 5334 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
5335 | |
5336 | return 0; | |
5337 | } | |
5338 | ||
686ebf28 | 5339 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
5340 | { |
5341 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5342 | ||
5343 | BT_DBG("hcon %p", hcon); | |
5344 | ||
686ebf28 | 5345 | if (!conn) |
9f5a0d7b | 5346 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
5347 | return conn->disc_reason; |
5348 | } | |
5349 | ||
686ebf28 | 5350 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
5351 | { |
5352 | BT_DBG("hcon %p reason %d", hcon, reason); | |
5353 | ||
e175072f | 5354 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
5355 | return 0; |
5356 | } | |
5357 | ||
4343478f | 5358 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 5359 | { |
715ec005 | 5360 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
5361 | return; |
5362 | ||
f62e4323 | 5363 | if (encrypt == 0x00) { |
4343478f | 5364 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 5365 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 5366 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 5367 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 5368 | } else { |
4343478f | 5369 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 5370 | __clear_chan_timer(chan); |
f62e4323 MH |
5371 | } |
5372 | } | |
5373 | ||
686ebf28 | 5374 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 5375 | { |
0139418c | 5376 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 5377 | struct l2cap_chan *chan; |
1da177e4 | 5378 | |
0139418c | 5379 | if (!conn) |
1da177e4 | 5380 | return 0; |
0139418c | 5381 | |
1da177e4 LT |
5382 | BT_DBG("conn %p", conn); |
5383 | ||
160dc6ac | 5384 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
5385 | if (!status && encrypt) |
5386 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 5387 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
5388 | } |
5389 | ||
3df91ea2 | 5390 | mutex_lock(&conn->chan_lock); |
1da177e4 | 5391 | |
3df91ea2 | 5392 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 5393 | l2cap_chan_lock(chan); |
1da177e4 | 5394 | |
f1cb9af5 VCG |
5395 | BT_DBG("chan->scid %d", chan->scid); |
5396 | ||
5397 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
5398 | if (!status && encrypt) { | |
5399 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 5400 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
5401 | } |
5402 | ||
6be36555 | 5403 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
5404 | continue; |
5405 | } | |
5406 | ||
c1360a1c | 5407 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 5408 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
5409 | continue; |
5410 | } | |
5411 | ||
89bc500e GP |
5412 | if (!status && (chan->state == BT_CONNECTED || |
5413 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
5414 | struct sock *sk = chan->sk; |
5415 | ||
c5daa683 | 5416 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
5417 | sk->sk_state_change(sk); |
5418 | ||
4343478f | 5419 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 5420 | l2cap_chan_unlock(chan); |
9719f8af MH |
5421 | continue; |
5422 | } | |
5423 | ||
89bc500e | 5424 | if (chan->state == BT_CONNECT) { |
b1235d79 | 5425 | if (!status) { |
9b27f350 | 5426 | l2cap_send_conn_req(chan); |
b1235d79 | 5427 | } else { |
ba13ccd9 | 5428 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 5429 | } |
89bc500e | 5430 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 5431 | struct sock *sk = chan->sk; |
b1235d79 | 5432 | struct l2cap_conn_rsp rsp; |
df3c3931 | 5433 | __u16 res, stat; |
1da177e4 | 5434 | |
6be36555 AE |
5435 | lock_sock(sk); |
5436 | ||
b1235d79 | 5437 | if (!status) { |
c5daa683 GP |
5438 | if (test_bit(BT_SK_DEFER_SETUP, |
5439 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
5440 | struct sock *parent = bt_sk(sk)->parent; |
5441 | res = L2CAP_CR_PEND; | |
5442 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
5443 | if (parent) |
5444 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 5445 | } else { |
0e587be7 | 5446 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
5447 | res = L2CAP_CR_SUCCESS; |
5448 | stat = L2CAP_CS_NO_INFO; | |
5449 | } | |
b1235d79 | 5450 | } else { |
0e587be7 | 5451 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 5452 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
5453 | res = L2CAP_CR_SEC_BLOCK; |
5454 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
5455 | } |
5456 | ||
6be36555 AE |
5457 | release_sock(sk); |
5458 | ||
fe4128e0 GP |
5459 | rsp.scid = cpu_to_le16(chan->dcid); |
5460 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
5461 | rsp.result = cpu_to_le16(res); |
5462 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
5463 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
5464 | sizeof(rsp), &rsp); | |
2d369359 MM |
5465 | |
5466 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
5467 | res == L2CAP_CR_SUCCESS) { | |
5468 | char buf[128]; | |
5469 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
5470 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
5471 | L2CAP_CONF_REQ, | |
5472 | l2cap_build_conf_req(chan, buf), | |
5473 | buf); | |
5474 | chan->num_conf_req++; | |
5475 | } | |
b1235d79 | 5476 | } |
1da177e4 | 5477 | |
6be36555 | 5478 | l2cap_chan_unlock(chan); |
1da177e4 LT |
5479 | } |
5480 | ||
3df91ea2 | 5481 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 5482 | |
1da177e4 LT |
5483 | return 0; |
5484 | } | |
5485 | ||
686ebf28 | 5486 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
5487 | { |
5488 | struct l2cap_conn *conn = hcon->l2cap_data; | |
5489 | ||
5a08ecce AE |
5490 | if (!conn) |
5491 | conn = l2cap_conn_add(hcon, 0); | |
5492 | ||
5493 | if (!conn) | |
1da177e4 LT |
5494 | goto drop; |
5495 | ||
5496 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5497 | ||
e702112f | 5498 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5499 | struct l2cap_hdr *hdr; |
5500 | int len; | |
5501 | ||
5502 | if (conn->rx_len) { | |
5503 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5504 | kfree_skb(conn->rx_skb); | |
5505 | conn->rx_skb = NULL; | |
5506 | conn->rx_len = 0; | |
5507 | l2cap_conn_unreliable(conn, ECOMM); | |
5508 | } | |
5509 | ||
aae7fe22 AE |
5510 | /* Start fragment always begin with Basic L2CAP header */ |
5511 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5512 | BT_ERR("Frame is too short (len %d)", skb->len); |
5513 | l2cap_conn_unreliable(conn, ECOMM); | |
5514 | goto drop; | |
5515 | } | |
5516 | ||
5517 | hdr = (struct l2cap_hdr *) skb->data; | |
5518 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5519 | ||
5520 | if (len == skb->len) { | |
5521 | /* Complete frame received */ | |
5522 | l2cap_recv_frame(conn, skb); | |
5523 | return 0; | |
5524 | } | |
5525 | ||
5526 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5527 | ||
5528 | if (skb->len > len) { | |
5529 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5530 | skb->len, len); | |
5531 | l2cap_conn_unreliable(conn, ECOMM); | |
5532 | goto drop; | |
5533 | } | |
5534 | ||
5535 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5536 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5537 | if (!conn->rx_skb) | |
1da177e4 LT |
5538 | goto drop; |
5539 | ||
d626f62b | 5540 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5541 | skb->len); |
1da177e4 LT |
5542 | conn->rx_len = len - skb->len; |
5543 | } else { | |
5544 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5545 | ||
5546 | if (!conn->rx_len) { | |
5547 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5548 | l2cap_conn_unreliable(conn, ECOMM); | |
5549 | goto drop; | |
5550 | } | |
5551 | ||
5552 | if (skb->len > conn->rx_len) { | |
5553 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5554 | skb->len, conn->rx_len); | |
5555 | kfree_skb(conn->rx_skb); | |
5556 | conn->rx_skb = NULL; | |
5557 | conn->rx_len = 0; | |
5558 | l2cap_conn_unreliable(conn, ECOMM); | |
5559 | goto drop; | |
5560 | } | |
5561 | ||
d626f62b | 5562 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5563 | skb->len); |
1da177e4 LT |
5564 | conn->rx_len -= skb->len; |
5565 | ||
5566 | if (!conn->rx_len) { | |
5567 | /* Complete frame received */ | |
5568 | l2cap_recv_frame(conn, conn->rx_skb); | |
5569 | conn->rx_skb = NULL; | |
5570 | } | |
5571 | } | |
5572 | ||
5573 | drop: | |
5574 | kfree_skb(skb); | |
5575 | return 0; | |
5576 | } | |
5577 | ||
aef7d97c | 5578 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5579 | { |
23691d75 | 5580 | struct l2cap_chan *c; |
1da177e4 | 5581 | |
333055f2 | 5582 | read_lock(&chan_list_lock); |
1da177e4 | 5583 | |
23691d75 GP |
5584 | list_for_each_entry(c, &chan_list, global_l) { |
5585 | struct sock *sk = c->sk; | |
101545f6 | 5586 | |
903d343e | 5587 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5588 | batostr(&bt_sk(sk)->src), |
5589 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5590 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5591 | c->scid, c->dcid, c->imtu, c->omtu, |
5592 | c->sec_level, c->mode); | |
61e1b4b7 | 5593 | } |
1da177e4 | 5594 | |
333055f2 | 5595 | read_unlock(&chan_list_lock); |
1da177e4 | 5596 | |
aef7d97c | 5597 | return 0; |
1da177e4 LT |
5598 | } |
5599 | ||
aef7d97c MH |
5600 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5601 | { | |
5602 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5603 | } | |
5604 | ||
5605 | static const struct file_operations l2cap_debugfs_fops = { | |
5606 | .open = l2cap_debugfs_open, | |
5607 | .read = seq_read, | |
5608 | .llseek = seq_lseek, | |
5609 | .release = single_release, | |
5610 | }; | |
5611 | ||
5612 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5613 | |
64274518 | 5614 | int __init l2cap_init(void) |
1da177e4 LT |
5615 | { |
5616 | int err; | |
be9d1227 | 5617 | |
bb58f747 | 5618 | err = l2cap_init_sockets(); |
1da177e4 LT |
5619 | if (err < 0) |
5620 | return err; | |
5621 | ||
aef7d97c MH |
5622 | if (bt_debugfs) { |
5623 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5624 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5625 | if (!l2cap_debugfs) | |
5626 | BT_ERR("Failed to create L2CAP debug file"); | |
5627 | } | |
1da177e4 | 5628 | |
1da177e4 | 5629 | return 0; |
1da177e4 LT |
5630 | } |
5631 | ||
64274518 | 5632 | void l2cap_exit(void) |
1da177e4 | 5633 | { |
aef7d97c | 5634 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5635 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5636 | } |
5637 | ||
d1c4a17d GP |
5638 | module_param(disable_ertm, bool, 0644); |
5639 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |