Commit | Line | Data |
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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 | 50 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 51 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 52 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 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, |
2d792818 | 59 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 60 | |
0139418c | 61 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 62 | |
2d792818 GP |
63 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
64 | u16 cid) | |
0139418c | 65 | { |
3df91ea2 | 66 | struct l2cap_chan *c; |
3d57dc68 | 67 | |
3df91ea2 AE |
68 | list_for_each_entry(c, &conn->chan_l, list) { |
69 | if (c->dcid == cid) | |
70 | return c; | |
0139418c | 71 | } |
3df91ea2 | 72 | return NULL; |
0139418c MH |
73 | } |
74 | ||
2d792818 GP |
75 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
76 | u16 cid) | |
0139418c | 77 | { |
3df91ea2 | 78 | struct l2cap_chan *c; |
3d57dc68 | 79 | |
3df91ea2 AE |
80 | list_for_each_entry(c, &conn->chan_l, list) { |
81 | if (c->scid == cid) | |
82 | return c; | |
0139418c | 83 | } |
3df91ea2 | 84 | return NULL; |
0139418c MH |
85 | } |
86 | ||
87 | /* Find channel with given SCID. | |
ef191ade | 88 | * Returns locked channel. */ |
2d792818 GP |
89 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
90 | u16 cid) | |
0139418c | 91 | { |
48454079 | 92 | struct l2cap_chan *c; |
baa7e1fa | 93 | |
3df91ea2 | 94 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 95 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
96 | if (c) |
97 | l2cap_chan_lock(c); | |
3df91ea2 AE |
98 | mutex_unlock(&conn->chan_lock); |
99 | ||
48454079 | 100 | return c; |
0139418c MH |
101 | } |
102 | ||
b1a130b7 MM |
103 | /* Find channel with given DCID. |
104 | * Returns locked channel. | |
105 | */ | |
106 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
107 | u16 cid) | |
108 | { | |
109 | struct l2cap_chan *c; | |
110 | ||
111 | mutex_lock(&conn->chan_lock); | |
112 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
113 | if (c) | |
114 | l2cap_chan_lock(c); | |
115 | mutex_unlock(&conn->chan_lock); | |
116 | ||
117 | return c; | |
118 | } | |
119 | ||
2d792818 GP |
120 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
121 | u8 ident) | |
0139418c | 122 | { |
3df91ea2 | 123 | struct l2cap_chan *c; |
3d57dc68 | 124 | |
3df91ea2 AE |
125 | list_for_each_entry(c, &conn->chan_l, list) { |
126 | if (c->ident == ident) | |
127 | return c; | |
0139418c | 128 | } |
3df91ea2 | 129 | return NULL; |
0139418c MH |
130 | } |
131 | ||
5b155ef9 MM |
132 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
133 | u8 ident) | |
134 | { | |
135 | struct l2cap_chan *c; | |
136 | ||
137 | mutex_lock(&conn->chan_lock); | |
138 | c = __l2cap_get_chan_by_ident(conn, ident); | |
139 | if (c) | |
140 | l2cap_chan_lock(c); | |
141 | mutex_unlock(&conn->chan_lock); | |
142 | ||
143 | return c; | |
144 | } | |
145 | ||
23691d75 | 146 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 147 | { |
23691d75 | 148 | struct l2cap_chan *c; |
9e4425ff | 149 | |
23691d75 GP |
150 | list_for_each_entry(c, &chan_list, global_l) { |
151 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 152 | return c; |
9e4425ff | 153 | } |
250938cb | 154 | return NULL; |
9e4425ff GP |
155 | } |
156 | ||
157 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
158 | { | |
73b2ec18 GP |
159 | int err; |
160 | ||
333055f2 | 161 | write_lock(&chan_list_lock); |
9e4425ff | 162 | |
23691d75 | 163 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
164 | err = -EADDRINUSE; |
165 | goto done; | |
9e4425ff GP |
166 | } |
167 | ||
73b2ec18 GP |
168 | if (psm) { |
169 | chan->psm = psm; | |
170 | chan->sport = psm; | |
171 | err = 0; | |
172 | } else { | |
173 | u16 p; | |
174 | ||
175 | err = -EINVAL; | |
176 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 177 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
178 | chan->psm = cpu_to_le16(p); |
179 | chan->sport = cpu_to_le16(p); | |
180 | err = 0; | |
181 | break; | |
182 | } | |
183 | } | |
9e4425ff | 184 | |
73b2ec18 | 185 | done: |
333055f2 | 186 | write_unlock(&chan_list_lock); |
73b2ec18 | 187 | return err; |
9e4425ff GP |
188 | } |
189 | ||
190 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
191 | { | |
333055f2 | 192 | write_lock(&chan_list_lock); |
9e4425ff GP |
193 | |
194 | chan->scid = scid; | |
195 | ||
333055f2 | 196 | write_unlock(&chan_list_lock); |
9e4425ff GP |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
baa7e1fa | 201 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 202 | { |
8db4dc46 | 203 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 204 | |
8db4dc46 | 205 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 206 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
207 | return cid; |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
0e587be7 | 213 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 214 | { |
42d2d87c | 215 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 216 | state_to_string(state)); |
badaaa00 | 217 | |
89bc500e | 218 | chan->state = state; |
80b98027 | 219 | chan->ops->state_change(chan, state); |
89bc500e GP |
220 | } |
221 | ||
0e587be7 AE |
222 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
223 | { | |
224 | struct sock *sk = chan->sk; | |
225 | ||
226 | lock_sock(sk); | |
227 | __l2cap_state_change(chan, state); | |
228 | release_sock(sk); | |
229 | } | |
230 | ||
2e0052e4 AE |
231 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
232 | { | |
233 | struct sock *sk = chan->sk; | |
234 | ||
235 | sk->sk_err = err; | |
236 | } | |
237 | ||
238 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
239 | { | |
240 | struct sock *sk = chan->sk; | |
241 | ||
242 | lock_sock(sk); | |
243 | __l2cap_chan_set_err(chan, err); | |
244 | release_sock(sk); | |
245 | } | |
246 | ||
4239d16f MM |
247 | static void __set_retrans_timer(struct l2cap_chan *chan) |
248 | { | |
249 | if (!delayed_work_pending(&chan->monitor_timer) && | |
250 | chan->retrans_timeout) { | |
251 | l2cap_set_timer(chan, &chan->retrans_timer, | |
252 | msecs_to_jiffies(chan->retrans_timeout)); | |
253 | } | |
254 | } | |
255 | ||
256 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
257 | { | |
258 | __clear_retrans_timer(chan); | |
259 | if (chan->monitor_timeout) { | |
260 | l2cap_set_timer(chan, &chan->monitor_timer, | |
261 | msecs_to_jiffies(chan->monitor_timeout)); | |
262 | } | |
263 | } | |
264 | ||
608bcc6d MM |
265 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
266 | u16 seq) | |
267 | { | |
268 | struct sk_buff *skb; | |
269 | ||
270 | skb_queue_walk(head, skb) { | |
271 | if (bt_cb(skb)->control.txseq == seq) | |
272 | return skb; | |
273 | } | |
274 | ||
275 | return NULL; | |
276 | } | |
277 | ||
3c588192 MM |
278 | /* ---- L2CAP sequence number lists ---- */ |
279 | ||
280 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
281 | * SREJ requests that are received and for frames that are to be | |
282 | * retransmitted. These seq_list functions implement a singly-linked | |
283 | * list in an array, where membership in the list can also be checked | |
284 | * in constant time. Items can also be added to the tail of the list | |
285 | * and removed from the head in constant time, without further memory | |
286 | * allocs or frees. | |
287 | */ | |
288 | ||
289 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
290 | { | |
291 | size_t alloc_size, i; | |
292 | ||
293 | /* Allocated size is a power of 2 to map sequence numbers | |
294 | * (which may be up to 14 bits) in to a smaller array that is | |
295 | * sized for the negotiated ERTM transmit windows. | |
296 | */ | |
297 | alloc_size = roundup_pow_of_two(size); | |
298 | ||
299 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
300 | if (!seq_list->list) | |
301 | return -ENOMEM; | |
302 | ||
303 | seq_list->mask = alloc_size - 1; | |
304 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
305 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
306 | for (i = 0; i < alloc_size; i++) | |
307 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
313 | { | |
314 | kfree(seq_list->list); | |
315 | } | |
316 | ||
317 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
318 | u16 seq) | |
319 | { | |
320 | /* Constant-time check for list membership */ | |
321 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
322 | } | |
323 | ||
324 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
325 | { | |
326 | u16 mask = seq_list->mask; | |
327 | ||
328 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
329 | /* In case someone tries to pop the head of an empty list */ | |
330 | return L2CAP_SEQ_LIST_CLEAR; | |
331 | } else if (seq_list->head == seq) { | |
332 | /* Head can be removed in constant time */ | |
333 | seq_list->head = seq_list->list[seq & mask]; | |
334 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
335 | ||
336 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
337 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
338 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
339 | } | |
340 | } else { | |
341 | /* Walk the list to find the sequence number */ | |
342 | u16 prev = seq_list->head; | |
343 | while (seq_list->list[prev & mask] != seq) { | |
344 | prev = seq_list->list[prev & mask]; | |
345 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
346 | return L2CAP_SEQ_LIST_CLEAR; | |
347 | } | |
348 | ||
349 | /* Unlink the number from the list and clear it */ | |
350 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
351 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
352 | if (seq_list->tail == seq) | |
353 | seq_list->tail = prev; | |
354 | } | |
355 | return seq; | |
356 | } | |
357 | ||
358 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
359 | { | |
360 | /* Remove the head in constant time */ | |
361 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
362 | } | |
363 | ||
364 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
365 | { | |
f522ae36 | 366 | u16 i; |
3c588192 | 367 | |
f522ae36 GP |
368 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
369 | return; | |
370 | ||
371 | for (i = 0; i <= seq_list->mask; i++) | |
372 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
373 | ||
374 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
375 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
376 | } |
377 | ||
378 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
379 | { | |
380 | u16 mask = seq_list->mask; | |
381 | ||
382 | /* All appends happen in constant time */ | |
383 | ||
f522ae36 GP |
384 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
385 | return; | |
3c588192 | 386 | |
f522ae36 GP |
387 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
388 | seq_list->head = seq; | |
389 | else | |
390 | seq_list->list[seq_list->tail & mask] = seq; | |
391 | ||
392 | seq_list->tail = seq; | |
393 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
394 | } |
395 | ||
721c4181 | 396 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 397 | { |
721c4181 | 398 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 399 | chan_timer.work); |
3df91ea2 | 400 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
401 | int reason; |
402 | ||
e05dcc32 | 403 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 404 | |
3df91ea2 | 405 | mutex_lock(&conn->chan_lock); |
6be36555 | 406 | l2cap_chan_lock(chan); |
ab07801d | 407 | |
89bc500e | 408 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 409 | reason = ECONNREFUSED; |
89bc500e | 410 | else if (chan->state == BT_CONNECT && |
2d792818 | 411 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
412 | reason = ECONNREFUSED; |
413 | else | |
414 | reason = ETIMEDOUT; | |
415 | ||
0f852724 | 416 | l2cap_chan_close(chan, reason); |
ab07801d | 417 | |
6be36555 | 418 | l2cap_chan_unlock(chan); |
ab07801d | 419 | |
80b98027 | 420 | chan->ops->close(chan); |
3df91ea2 AE |
421 | mutex_unlock(&conn->chan_lock); |
422 | ||
371fd835 | 423 | l2cap_chan_put(chan); |
ab07801d GP |
424 | } |
425 | ||
eef1d9b6 | 426 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
427 | { |
428 | struct l2cap_chan *chan; | |
429 | ||
430 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
431 | if (!chan) | |
432 | return NULL; | |
433 | ||
c03b355e AE |
434 | mutex_init(&chan->lock); |
435 | ||
333055f2 | 436 | write_lock(&chan_list_lock); |
23691d75 | 437 | list_add(&chan->global_l, &chan_list); |
333055f2 | 438 | write_unlock(&chan_list_lock); |
23691d75 | 439 | |
721c4181 | 440 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 441 | |
89bc500e GP |
442 | chan->state = BT_OPEN; |
443 | ||
144ad330 | 444 | kref_init(&chan->kref); |
71ba0e56 | 445 | |
2827011f MM |
446 | /* This flag is cleared in l2cap_chan_ready() */ |
447 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
448 | ||
eef1d9b6 | 449 | BT_DBG("chan %p", chan); |
abc545b8 | 450 | |
48454079 GP |
451 | return chan; |
452 | } | |
453 | ||
144ad330 | 454 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 455 | { |
144ad330 SS |
456 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
457 | ||
4af66c69 JK |
458 | BT_DBG("chan %p", chan); |
459 | ||
333055f2 | 460 | write_lock(&chan_list_lock); |
23691d75 | 461 | list_del(&chan->global_l); |
333055f2 | 462 | write_unlock(&chan_list_lock); |
23691d75 | 463 | |
4af66c69 | 464 | kfree(chan); |
6ff5abbf GP |
465 | } |
466 | ||
30648372 JK |
467 | void l2cap_chan_hold(struct l2cap_chan *c) |
468 | { | |
144ad330 | 469 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 470 | |
144ad330 | 471 | kref_get(&c->kref); |
30648372 JK |
472 | } |
473 | ||
474 | void l2cap_chan_put(struct l2cap_chan *c) | |
475 | { | |
144ad330 | 476 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 477 | |
144ad330 | 478 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 JK |
479 | } |
480 | ||
bd4b1653 AE |
481 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
482 | { | |
483 | chan->fcs = L2CAP_FCS_CRC16; | |
484 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
485 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
486 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
c20f8e35 | 487 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 AE |
488 | chan->sec_level = BT_SECURITY_LOW; |
489 | ||
490 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
491 | } | |
492 | ||
93c3e8f5 | 493 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 494 | { |
af05b30b | 495 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 496 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 497 | |
9f5a0d7b | 498 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 499 | |
8c1d787b | 500 | chan->conn = conn; |
0139418c | 501 | |
5491120e AE |
502 | switch (chan->chan_type) { |
503 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
504 | if (conn->hcon->type == LE_LINK) { |
505 | /* LE connection */ | |
6fcb06a2 | 506 | chan->omtu = L2CAP_DEFAULT_MTU; |
fe4128e0 GP |
507 | chan->scid = L2CAP_CID_LE_DATA; |
508 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
509 | } else { |
510 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 511 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 512 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 513 | } |
5491120e AE |
514 | break; |
515 | ||
516 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 517 | /* Connectionless socket */ |
fe4128e0 GP |
518 | chan->scid = L2CAP_CID_CONN_LESS; |
519 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 520 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
521 | break; |
522 | ||
416fa752 AE |
523 | case L2CAP_CHAN_CONN_FIX_A2MP: |
524 | chan->scid = L2CAP_CID_A2MP; | |
525 | chan->dcid = L2CAP_CID_A2MP; | |
526 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
527 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
528 | break; | |
529 | ||
5491120e | 530 | default: |
0139418c | 531 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
532 | chan->scid = L2CAP_CID_SIGNALING; |
533 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 534 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
535 | } |
536 | ||
8f7975b1 AE |
537 | chan->local_id = L2CAP_BESTEFFORT_ID; |
538 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
539 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
540 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
541 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 542 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 543 | |
371fd835 | 544 | l2cap_chan_hold(chan); |
baa7e1fa | 545 | |
3df91ea2 | 546 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
547 | } |
548 | ||
466f8004 | 549 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
550 | { |
551 | mutex_lock(&conn->chan_lock); | |
552 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 553 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
554 | } |
555 | ||
466f8004 | 556 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 557 | { |
8c1d787b | 558 | struct l2cap_conn *conn = chan->conn; |
0139418c | 559 | |
c9b66675 | 560 | __clear_chan_timer(chan); |
0139418c | 561 | |
49208c9c | 562 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 563 | |
8e87d142 | 564 | if (conn) { |
56f60984 | 565 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 566 | /* Delete from channel list */ |
3df91ea2 | 567 | list_del(&chan->list); |
3d57dc68 | 568 | |
371fd835 | 569 | l2cap_chan_put(chan); |
baa7e1fa | 570 | |
8c1d787b | 571 | chan->conn = NULL; |
3cabbfda AE |
572 | |
573 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
574 | hci_conn_put(conn->hcon); | |
56f60984 AE |
575 | |
576 | if (mgr && mgr->bredr_chan == chan) | |
577 | mgr->bredr_chan = NULL; | |
0139418c MH |
578 | } |
579 | ||
b699ec0d | 580 | chan->ops->teardown(chan, err); |
6be36555 | 581 | |
2827011f | 582 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 583 | return; |
2ead70b8 | 584 | |
ee556f66 GP |
585 | switch(chan->mode) { |
586 | case L2CAP_MODE_BASIC: | |
587 | break; | |
c13ffa62 | 588 | |
ee556f66 | 589 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
590 | __clear_retrans_timer(chan); |
591 | __clear_monitor_timer(chan); | |
592 | __clear_ack_timer(chan); | |
c13ffa62 | 593 | |
f1c6775b | 594 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 595 | |
3c588192 MM |
596 | l2cap_seq_list_free(&chan->srej_list); |
597 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
598 | |
599 | /* fall through */ | |
600 | ||
601 | case L2CAP_MODE_STREAMING: | |
602 | skb_queue_purge(&chan->tx_q); | |
603 | break; | |
c13ffa62 | 604 | } |
ee556f66 GP |
605 | |
606 | return; | |
0139418c MH |
607 | } |
608 | ||
0f852724 | 609 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
610 | { |
611 | struct l2cap_conn *conn = chan->conn; | |
612 | struct sock *sk = chan->sk; | |
613 | ||
2d792818 GP |
614 | BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state), |
615 | sk); | |
4519de9a | 616 | |
89bc500e | 617 | switch (chan->state) { |
4519de9a | 618 | case BT_LISTEN: |
b699ec0d | 619 | chan->ops->teardown(chan, 0); |
4519de9a GP |
620 | break; |
621 | ||
622 | case BT_CONNECTED: | |
623 | case BT_CONFIG: | |
715ec005 | 624 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 625 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 626 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
627 | l2cap_send_disconn_req(conn, chan, reason); |
628 | } else | |
629 | l2cap_chan_del(chan, reason); | |
630 | break; | |
631 | ||
632 | case BT_CONNECT2: | |
715ec005 | 633 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 634 | conn->hcon->type == ACL_LINK) { |
4519de9a GP |
635 | struct l2cap_conn_rsp rsp; |
636 | __u16 result; | |
637 | ||
c5daa683 | 638 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) |
4519de9a GP |
639 | result = L2CAP_CR_SEC_BLOCK; |
640 | else | |
641 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 642 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
643 | |
644 | rsp.scid = cpu_to_le16(chan->dcid); | |
645 | rsp.dcid = cpu_to_le16(chan->scid); | |
646 | rsp.result = cpu_to_le16(result); | |
ac73498c | 647 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a | 648 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 649 | sizeof(rsp), &rsp); |
4519de9a GP |
650 | } |
651 | ||
652 | l2cap_chan_del(chan, reason); | |
653 | break; | |
654 | ||
655 | case BT_CONNECT: | |
656 | case BT_DISCONN: | |
657 | l2cap_chan_del(chan, reason); | |
658 | break; | |
659 | ||
660 | default: | |
b699ec0d | 661 | chan->ops->teardown(chan, 0); |
4519de9a GP |
662 | break; |
663 | } | |
664 | } | |
665 | ||
4343478f | 666 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 667 | { |
715ec005 | 668 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 669 | switch (chan->sec_level) { |
8556edd3 JH |
670 | case BT_SECURITY_HIGH: |
671 | return HCI_AT_DEDICATED_BONDING_MITM; | |
672 | case BT_SECURITY_MEDIUM: | |
673 | return HCI_AT_DEDICATED_BONDING; | |
674 | default: | |
675 | return HCI_AT_NO_BONDING; | |
676 | } | |
2983fd68 | 677 | } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { |
4343478f GP |
678 | if (chan->sec_level == BT_SECURITY_LOW) |
679 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 680 | |
4343478f | 681 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 682 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 683 | else |
8556edd3 | 684 | return HCI_AT_NO_BONDING; |
00ae4af9 | 685 | } else { |
4343478f | 686 | switch (chan->sec_level) { |
00ae4af9 | 687 | case BT_SECURITY_HIGH: |
8556edd3 | 688 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 689 | case BT_SECURITY_MEDIUM: |
8556edd3 | 690 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 691 | default: |
8556edd3 | 692 | return HCI_AT_NO_BONDING; |
00ae4af9 | 693 | } |
0684e5f9 | 694 | } |
8556edd3 JH |
695 | } |
696 | ||
697 | /* Service level security */ | |
d45fc423 | 698 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 699 | { |
8c1d787b | 700 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
701 | __u8 auth_type; |
702 | ||
4343478f | 703 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 704 | |
4343478f | 705 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
706 | } |
707 | ||
b5ad8b7f | 708 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
709 | { |
710 | u8 id; | |
711 | ||
712 | /* Get next available identificator. | |
713 | * 1 - 128 are used by kernel. | |
714 | * 129 - 199 are reserved. | |
715 | * 200 - 254 are used by utilities like l2ping, etc. | |
716 | */ | |
717 | ||
333055f2 | 718 | spin_lock(&conn->lock); |
4e8402a3 MH |
719 | |
720 | if (++conn->tx_ident > 128) | |
721 | conn->tx_ident = 1; | |
722 | ||
723 | id = conn->tx_ident; | |
724 | ||
333055f2 | 725 | spin_unlock(&conn->lock); |
4e8402a3 MH |
726 | |
727 | return id; | |
728 | } | |
729 | ||
2d792818 GP |
730 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
731 | void *data) | |
4e8402a3 MH |
732 | { |
733 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 734 | u8 flags; |
4e8402a3 MH |
735 | |
736 | BT_DBG("code 0x%2.2x", code); | |
737 | ||
738 | if (!skb) | |
9a9c6a34 | 739 | return; |
4e8402a3 | 740 | |
e702112f AE |
741 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
742 | flags = ACL_START_NO_FLUSH; | |
743 | else | |
744 | flags = ACL_START; | |
745 | ||
14b12d0b | 746 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 747 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 748 | |
73d80deb LAD |
749 | hci_send_acl(conn->hchan, skb, flags); |
750 | } | |
751 | ||
02b0fbb9 MM |
752 | static bool __chan_is_moving(struct l2cap_chan *chan) |
753 | { | |
754 | return chan->move_state != L2CAP_MOVE_STABLE && | |
755 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
756 | } | |
757 | ||
73d80deb LAD |
758 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
759 | { | |
760 | struct hci_conn *hcon = chan->conn->hcon; | |
761 | u16 flags; | |
762 | ||
763 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 764 | skb->priority); |
73d80deb LAD |
765 | |
766 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
2d792818 | 767 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
768 | flags = ACL_START_NO_FLUSH; |
769 | else | |
770 | flags = ACL_START; | |
14b12d0b | 771 | |
73d80deb LAD |
772 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
773 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
774 | } |
775 | ||
b76bbd66 MM |
776 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
777 | { | |
778 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
779 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
780 | ||
781 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
782 | /* S-Frame */ | |
783 | control->sframe = 1; | |
784 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
785 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
786 | ||
787 | control->sar = 0; | |
788 | control->txseq = 0; | |
789 | } else { | |
790 | /* I-Frame */ | |
791 | control->sframe = 0; | |
792 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
793 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
794 | ||
795 | control->poll = 0; | |
796 | control->super = 0; | |
797 | } | |
798 | } | |
799 | ||
b76bbd66 MM |
800 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
801 | { | |
802 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
803 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
804 | ||
805 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
806 | /* S-Frame */ | |
807 | control->sframe = 1; | |
808 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
809 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
810 | ||
811 | control->sar = 0; | |
812 | control->txseq = 0; | |
813 | } else { | |
814 | /* I-Frame */ | |
815 | control->sframe = 0; | |
816 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
817 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
818 | ||
819 | control->poll = 0; | |
820 | control->super = 0; | |
821 | } | |
822 | } | |
823 | ||
824 | static inline void __unpack_control(struct l2cap_chan *chan, | |
825 | struct sk_buff *skb) | |
826 | { | |
827 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
828 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
829 | &bt_cb(skb)->control); | |
cec8ab6e | 830 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
831 | } else { |
832 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
833 | &bt_cb(skb)->control); | |
cec8ab6e | 834 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
835 | } |
836 | } | |
837 | ||
b5c6aaed MM |
838 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
839 | { | |
840 | u32 packed; | |
841 | ||
842 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
843 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
844 | ||
845 | if (control->sframe) { | |
846 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
847 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
848 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
849 | } else { | |
850 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
851 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
852 | } | |
853 | ||
854 | return packed; | |
855 | } | |
856 | ||
857 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
858 | { | |
859 | u16 packed; | |
860 | ||
861 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
862 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
863 | ||
864 | if (control->sframe) { | |
865 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
866 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
867 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
868 | } else { | |
869 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
870 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
871 | } | |
872 | ||
873 | return packed; | |
874 | } | |
875 | ||
b76bbd66 MM |
876 | static inline void __pack_control(struct l2cap_chan *chan, |
877 | struct l2cap_ctrl *control, | |
878 | struct sk_buff *skb) | |
879 | { | |
880 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
881 | put_unaligned_le32(__pack_extended_control(control), | |
882 | skb->data + L2CAP_HDR_SIZE); | |
883 | } else { | |
884 | put_unaligned_le16(__pack_enhanced_control(control), | |
885 | skb->data + L2CAP_HDR_SIZE); | |
886 | } | |
887 | } | |
888 | ||
ba7aa64f GP |
889 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
890 | { | |
891 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
892 | return L2CAP_EXT_HDR_SIZE; | |
893 | else | |
894 | return L2CAP_ENH_HDR_SIZE; | |
895 | } | |
896 | ||
a67d7f6f MM |
897 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
898 | u32 control) | |
b5c6aaed MM |
899 | { |
900 | struct sk_buff *skb; | |
901 | struct l2cap_hdr *lh; | |
ba7aa64f | 902 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
903 | |
904 | if (chan->fcs == L2CAP_FCS_CRC16) | |
905 | hlen += L2CAP_FCS_SIZE; | |
906 | ||
a67d7f6f | 907 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 908 | |
b5c6aaed | 909 | if (!skb) |
a67d7f6f | 910 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
911 | |
912 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
913 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
914 | lh->cid = cpu_to_le16(chan->dcid); | |
915 | ||
a67d7f6f MM |
916 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
917 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
918 | else | |
919 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
920 | |
921 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 922 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
923 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
924 | } | |
925 | ||
926 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
927 | return skb; |
928 | } | |
929 | ||
930 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
931 | struct l2cap_ctrl *control) | |
932 | { | |
933 | struct sk_buff *skb; | |
934 | u32 control_field; | |
935 | ||
936 | BT_DBG("chan %p, control %p", chan, control); | |
937 | ||
938 | if (!control->sframe) | |
939 | return; | |
940 | ||
941 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && | |
942 | !control->poll) | |
943 | control->final = 1; | |
944 | ||
945 | if (control->super == L2CAP_SUPER_RR) | |
946 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
947 | else if (control->super == L2CAP_SUPER_RNR) | |
948 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
949 | ||
950 | if (control->super != L2CAP_SUPER_SREJ) { | |
951 | chan->last_acked_seq = control->reqseq; | |
952 | __clear_ack_timer(chan); | |
953 | } | |
954 | ||
955 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
956 | control->final, control->poll, control->super); | |
957 | ||
958 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
959 | control_field = __pack_extended_control(control); | |
960 | else | |
961 | control_field = __pack_enhanced_control(control); | |
962 | ||
963 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
964 | if (!IS_ERR(skb)) | |
965 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
966 | } |
967 | ||
c9e3d5e0 | 968 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 969 | { |
c9e3d5e0 MM |
970 | struct l2cap_ctrl control; |
971 | ||
972 | BT_DBG("chan %p, poll %d", chan, poll); | |
973 | ||
974 | memset(&control, 0, sizeof(control)); | |
975 | control.sframe = 1; | |
976 | control.poll = poll; | |
977 | ||
978 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
979 | control.super = L2CAP_SUPER_RNR; | |
980 | else | |
981 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 982 | |
c9e3d5e0 MM |
983 | control.reqseq = chan->buffer_seq; |
984 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
985 | } |
986 | ||
b4450035 | 987 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 988 | { |
c1360a1c | 989 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
990 | } |
991 | ||
93c3e8f5 AE |
992 | static bool __amp_capable(struct l2cap_chan *chan) |
993 | { | |
994 | struct l2cap_conn *conn = chan->conn; | |
995 | ||
996 | if (enable_hs && | |
997 | chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED && | |
998 | conn->fixed_chan_mask & L2CAP_FC_A2MP) | |
999 | return true; | |
1000 | else | |
1001 | return false; | |
1002 | } | |
1003 | ||
2766be48 | 1004 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1005 | { |
1006 | struct l2cap_conn *conn = chan->conn; | |
1007 | struct l2cap_conn_req req; | |
1008 | ||
1009 | req.scid = cpu_to_le16(chan->scid); | |
1010 | req.psm = chan->psm; | |
1011 | ||
1012 | chan->ident = l2cap_get_ident(conn); | |
1013 | ||
1014 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1015 | ||
1016 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1017 | } | |
1018 | ||
8eb200bd MM |
1019 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1020 | { | |
1021 | struct l2cap_create_chan_req req; | |
1022 | req.scid = cpu_to_le16(chan->scid); | |
1023 | req.psm = chan->psm; | |
1024 | req.amp_id = amp_id; | |
1025 | ||
1026 | chan->ident = l2cap_get_ident(chan->conn); | |
1027 | ||
1028 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1029 | sizeof(req), &req); | |
1030 | } | |
1031 | ||
02b0fbb9 MM |
1032 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1033 | { | |
1034 | struct sk_buff *skb; | |
1035 | ||
1036 | BT_DBG("chan %p", chan); | |
1037 | ||
1038 | if (chan->mode != L2CAP_MODE_ERTM) | |
1039 | return; | |
1040 | ||
1041 | __clear_retrans_timer(chan); | |
1042 | __clear_monitor_timer(chan); | |
1043 | __clear_ack_timer(chan); | |
1044 | ||
1045 | chan->retry_count = 0; | |
1046 | skb_queue_walk(&chan->tx_q, skb) { | |
1047 | if (bt_cb(skb)->control.retries) | |
1048 | bt_cb(skb)->control.retries = 1; | |
1049 | else | |
1050 | break; | |
1051 | } | |
1052 | ||
1053 | chan->expected_tx_seq = chan->buffer_seq; | |
1054 | ||
1055 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1056 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1057 | l2cap_seq_list_clear(&chan->retrans_list); | |
1058 | l2cap_seq_list_clear(&chan->srej_list); | |
1059 | skb_queue_purge(&chan->srej_q); | |
1060 | ||
1061 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1062 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1063 | ||
1064 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1065 | } | |
1066 | ||
5f3847a4 MM |
1067 | static void l2cap_move_done(struct l2cap_chan *chan) |
1068 | { | |
1069 | u8 move_role = chan->move_role; | |
1070 | BT_DBG("chan %p", chan); | |
1071 | ||
1072 | chan->move_state = L2CAP_MOVE_STABLE; | |
1073 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1074 | ||
1075 | if (chan->mode != L2CAP_MODE_ERTM) | |
1076 | return; | |
1077 | ||
1078 | switch (move_role) { | |
1079 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1080 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1081 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1082 | break; | |
1083 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1084 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1085 | break; | |
1086 | } | |
1087 | } | |
1088 | ||
9f0caeb1 VCG |
1089 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1090 | { | |
2827011f | 1091 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1092 | chan->conf_state = 0; |
1093 | __clear_chan_timer(chan); | |
1094 | ||
54a59aa2 | 1095 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1096 | |
fd83e2c2 | 1097 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1098 | } |
1099 | ||
93c3e8f5 AE |
1100 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1101 | { | |
1102 | if (__amp_capable(chan)) { | |
1103 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1104 | a2mp_discover_amp(chan); | |
1105 | } else { | |
1106 | l2cap_send_conn_req(chan); | |
1107 | } | |
1108 | } | |
1109 | ||
fc7f8a7e | 1110 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1111 | { |
8c1d787b | 1112 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1113 | |
9f0caeb1 VCG |
1114 | if (conn->hcon->type == LE_LINK) { |
1115 | l2cap_chan_ready(chan); | |
1116 | return; | |
1117 | } | |
1118 | ||
79d554a6 | 1119 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1120 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1121 | return; | |
1122 | ||
d45fc423 | 1123 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1124 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1125 | l2cap_start_connection(chan); |
1126 | } | |
79d554a6 MH |
1127 | } else { |
1128 | struct l2cap_info_req req; | |
ac73498c | 1129 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1130 | |
1131 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1132 | conn->info_ident = l2cap_get_ident(conn); | |
1133 | ||
ba13ccd9 | 1134 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1135 | |
2d792818 GP |
1136 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1137 | sizeof(req), &req); | |
79d554a6 MH |
1138 | } |
1139 | } | |
1140 | ||
cf6c2c0b GP |
1141 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1142 | { | |
1143 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1144 | if (!disable_ertm) |
cf6c2c0b GP |
1145 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1146 | ||
1147 | switch (mode) { | |
1148 | case L2CAP_MODE_ERTM: | |
1149 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1150 | case L2CAP_MODE_STREAMING: | |
1151 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1152 | default: | |
1153 | return 0x00; | |
1154 | } | |
1155 | } | |
1156 | ||
2d792818 GP |
1157 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
1158 | struct l2cap_chan *chan, int err) | |
22121fc9 | 1159 | { |
6be36555 | 1160 | struct sock *sk = chan->sk; |
22121fc9 GP |
1161 | struct l2cap_disconn_req req; |
1162 | ||
c13ffa62 GP |
1163 | if (!conn) |
1164 | return; | |
1165 | ||
aad3d0e3 | 1166 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1167 | __clear_retrans_timer(chan); |
1168 | __clear_monitor_timer(chan); | |
1169 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1170 | } |
1171 | ||
416fa752 | 1172 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
d117773c | 1173 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1174 | return; |
1175 | } | |
1176 | ||
fe4128e0 GP |
1177 | req.dcid = cpu_to_le16(chan->dcid); |
1178 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1179 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1180 | sizeof(req), &req); | |
c13ffa62 | 1181 | |
6be36555 | 1182 | lock_sock(sk); |
0e587be7 | 1183 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1184 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1185 | release_sock(sk); |
22121fc9 GP |
1186 | } |
1187 | ||
1da177e4 | 1188 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1189 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1190 | { | |
3df91ea2 | 1191 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1192 | |
1193 | BT_DBG("conn %p", conn); | |
1194 | ||
3df91ea2 | 1195 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1196 | |
3df91ea2 | 1197 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1198 | struct sock *sk = chan->sk; |
baa7e1fa | 1199 | |
6be36555 | 1200 | l2cap_chan_lock(chan); |
4e8402a3 | 1201 | |
715ec005 | 1202 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1203 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1204 | continue; |
1205 | } | |
1206 | ||
89bc500e | 1207 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1208 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1209 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1210 | l2cap_chan_unlock(chan); |
47731de7 GP |
1211 | continue; |
1212 | } | |
79d554a6 | 1213 | |
c1360a1c | 1214 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1215 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1216 | &chan->conf_state)) { |
89bc500e | 1217 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1218 | l2cap_chan_unlock(chan); |
47731de7 | 1219 | continue; |
b1235d79 | 1220 | } |
47731de7 | 1221 | |
93c3e8f5 | 1222 | l2cap_start_connection(chan); |
47731de7 | 1223 | |
89bc500e | 1224 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1225 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1226 | char buf[128]; |
fe4128e0 GP |
1227 | rsp.scid = cpu_to_le16(chan->dcid); |
1228 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1229 | |
d45fc423 | 1230 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1231 | lock_sock(sk); |
c5daa683 GP |
1232 | if (test_bit(BT_SK_DEFER_SETUP, |
1233 | &bt_sk(sk)->flags)) { | |
ac73498c AE |
1234 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1235 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1236 | chan->ops->defer(chan); |
f66dc81f MH |
1237 | |
1238 | } else { | |
0e587be7 | 1239 | __l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1240 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1241 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1242 | } |
6be36555 | 1243 | release_sock(sk); |
79d554a6 | 1244 | } else { |
ac73498c AE |
1245 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1246 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1247 | } |
1248 | ||
fc7f8a7e | 1249 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1250 | sizeof(rsp), &rsp); |
e9aeb2dd | 1251 | |
c1360a1c | 1252 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1253 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1254 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1255 | continue; |
1256 | } | |
1257 | ||
c1360a1c | 1258 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1259 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1260 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1261 | chan->num_conf_req++; |
4e8402a3 MH |
1262 | } |
1263 | ||
6be36555 | 1264 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1265 | } |
1266 | ||
3df91ea2 | 1267 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1268 | } |
1269 | ||
c2287681 | 1270 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1271 | * Returns closest match, locked. |
1272 | */ | |
d9b88702 | 1273 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1274 | bdaddr_t *src, |
1275 | bdaddr_t *dst) | |
b62f328b | 1276 | { |
23691d75 | 1277 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1278 | |
23691d75 | 1279 | read_lock(&chan_list_lock); |
b62f328b | 1280 | |
23691d75 GP |
1281 | list_for_each_entry(c, &chan_list, global_l) { |
1282 | struct sock *sk = c->sk; | |
fe4128e0 | 1283 | |
89bc500e | 1284 | if (state && c->state != state) |
b62f328b VT |
1285 | continue; |
1286 | ||
23691d75 | 1287 | if (c->scid == cid) { |
c2287681 IY |
1288 | int src_match, dst_match; |
1289 | int src_any, dst_any; | |
1290 | ||
b62f328b | 1291 | /* Exact match. */ |
c2287681 IY |
1292 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1293 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1294 | if (src_match && dst_match) { | |
23691d75 GP |
1295 | read_unlock(&chan_list_lock); |
1296 | return c; | |
1297 | } | |
b62f328b VT |
1298 | |
1299 | /* Closest match */ | |
c2287681 IY |
1300 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1301 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1302 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1303 | (src_any && dst_any)) | |
23691d75 | 1304 | c1 = c; |
b62f328b VT |
1305 | } |
1306 | } | |
280f294f | 1307 | |
23691d75 | 1308 | read_unlock(&chan_list_lock); |
b62f328b | 1309 | |
23691d75 | 1310 | return c1; |
b62f328b VT |
1311 | } |
1312 | ||
1313 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1314 | { | |
c916fbe4 | 1315 | struct sock *parent, *sk; |
23691d75 | 1316 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1317 | |
1318 | BT_DBG(""); | |
1319 | ||
1320 | /* Check if we have socket listening on cid */ | |
23691d75 | 1321 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1322 | conn->src, conn->dst); |
23691d75 | 1323 | if (!pchan) |
b62f328b VT |
1324 | return; |
1325 | ||
23691d75 GP |
1326 | parent = pchan->sk; |
1327 | ||
aa2ac881 | 1328 | lock_sock(parent); |
62f3a2cf | 1329 | |
80b98027 | 1330 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1331 | if (!chan) |
b62f328b VT |
1332 | goto clean; |
1333 | ||
80808e43 | 1334 | sk = chan->sk; |
5d41ce1d | 1335 | |
b62f328b | 1336 | hci_conn_hold(conn->hcon); |
a9ea3ed9 | 1337 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
b62f328b | 1338 | |
b62f328b VT |
1339 | bacpy(&bt_sk(sk)->src, conn->src); |
1340 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1341 | ||
3d57dc68 | 1342 | l2cap_chan_add(conn, chan); |
48454079 | 1343 | |
6754e0df | 1344 | l2cap_chan_ready(chan); |
b62f328b | 1345 | |
b62f328b | 1346 | clean: |
aa2ac881 | 1347 | release_sock(parent); |
b62f328b VT |
1348 | } |
1349 | ||
4e8402a3 MH |
1350 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1351 | { | |
48454079 | 1352 | struct l2cap_chan *chan; |
cc110922 | 1353 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1354 | |
79d554a6 | 1355 | BT_DBG("conn %p", conn); |
4e8402a3 | 1356 | |
cc110922 | 1357 | if (!hcon->out && hcon->type == LE_LINK) |
b62f328b VT |
1358 | l2cap_le_conn_ready(conn); |
1359 | ||
cc110922 VCG |
1360 | if (hcon->out && hcon->type == LE_LINK) |
1361 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1362 | |
3df91ea2 | 1363 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1364 | |
3df91ea2 | 1365 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1366 | |
6be36555 | 1367 | l2cap_chan_lock(chan); |
4e8402a3 | 1368 | |
416fa752 AE |
1369 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1370 | l2cap_chan_unlock(chan); | |
1371 | continue; | |
1372 | } | |
1373 | ||
cc110922 VCG |
1374 | if (hcon->type == LE_LINK) { |
1375 | if (smp_conn_security(hcon, chan->sec_level)) | |
cf4cd009 | 1376 | l2cap_chan_ready(chan); |
acd7d370 | 1377 | |
63128451 | 1378 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1379 | struct sock *sk = chan->sk; |
c9b66675 | 1380 | __clear_chan_timer(chan); |
6be36555 | 1381 | lock_sock(sk); |
0e587be7 | 1382 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1383 | sk->sk_state_change(sk); |
6be36555 | 1384 | release_sock(sk); |
b501d6a1 | 1385 | |
89bc500e | 1386 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1387 | l2cap_do_start(chan); |
4e8402a3 | 1388 | |
6be36555 | 1389 | l2cap_chan_unlock(chan); |
4e8402a3 | 1390 | } |
79d554a6 | 1391 | |
3df91ea2 | 1392 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1393 | } |
1394 | ||
1395 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1396 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1397 | { | |
48454079 | 1398 | struct l2cap_chan *chan; |
4e8402a3 MH |
1399 | |
1400 | BT_DBG("conn %p", conn); | |
1401 | ||
3df91ea2 | 1402 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1403 | |
3df91ea2 | 1404 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1405 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1406 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1407 | } |
1408 | ||
3df91ea2 | 1409 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1410 | } |
1411 | ||
f878fcad | 1412 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1413 | { |
f878fcad | 1414 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1415 | info_timer.work); |
4e8402a3 | 1416 | |
984947dc | 1417 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1418 | conn->info_ident = 0; |
984947dc | 1419 | |
4e8402a3 MH |
1420 | l2cap_conn_start(conn); |
1421 | } | |
1422 | ||
5d3de7df VCG |
1423 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1424 | { | |
1425 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1426 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1427 | |
1428 | if (!conn) | |
1429 | return; | |
1430 | ||
1431 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1432 | ||
1433 | kfree_skb(conn->rx_skb); | |
1434 | ||
3df91ea2 AE |
1435 | mutex_lock(&conn->chan_lock); |
1436 | ||
5d3de7df VCG |
1437 | /* Kill channels */ |
1438 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1439 | l2cap_chan_hold(chan); |
6be36555 AE |
1440 | l2cap_chan_lock(chan); |
1441 | ||
5d3de7df | 1442 | l2cap_chan_del(chan, err); |
6be36555 AE |
1443 | |
1444 | l2cap_chan_unlock(chan); | |
1445 | ||
80b98027 | 1446 | chan->ops->close(chan); |
61d6ef3e | 1447 | l2cap_chan_put(chan); |
5d3de7df VCG |
1448 | } |
1449 | ||
3df91ea2 AE |
1450 | mutex_unlock(&conn->chan_lock); |
1451 | ||
73d80deb LAD |
1452 | hci_chan_del(conn->hchan); |
1453 | ||
5d3de7df | 1454 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1455 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1456 | |
51a8efd7 | 1457 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1458 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1459 | smp_chan_destroy(conn); |
d26a2345 | 1460 | } |
5d3de7df VCG |
1461 | |
1462 | hcon->l2cap_data = NULL; | |
1463 | kfree(conn); | |
1464 | } | |
1465 | ||
6c9d42a1 | 1466 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1467 | { |
6c9d42a1 | 1468 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1469 | security_timer.work); |
5d3de7df | 1470 | |
d06cc416 JH |
1471 | BT_DBG("conn %p", conn); |
1472 | ||
1473 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1474 | smp_chan_destroy(conn); | |
1475 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1476 | } | |
5d3de7df VCG |
1477 | } |
1478 | ||
1da177e4 LT |
1479 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1480 | { | |
0139418c | 1481 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1482 | struct hci_chan *hchan; |
1da177e4 | 1483 | |
0139418c | 1484 | if (conn || status) |
1da177e4 LT |
1485 | return conn; |
1486 | ||
73d80deb LAD |
1487 | hchan = hci_chan_create(hcon); |
1488 | if (!hchan) | |
1489 | return NULL; | |
1490 | ||
8bcde1f2 | 1491 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
73d80deb LAD |
1492 | if (!conn) { |
1493 | hci_chan_del(hchan); | |
1da177e4 | 1494 | return NULL; |
73d80deb | 1495 | } |
1da177e4 LT |
1496 | |
1497 | hcon->l2cap_data = conn; | |
1498 | conn->hcon = hcon; | |
73d80deb | 1499 | conn->hchan = hchan; |
1da177e4 | 1500 | |
73d80deb | 1501 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1502 | |
dcc042d5 AE |
1503 | switch (hcon->type) { |
1504 | case AMP_LINK: | |
1505 | conn->mtu = hcon->hdev->block_mtu; | |
1506 | break; | |
1507 | ||
1508 | case LE_LINK: | |
1509 | if (hcon->hdev->le_mtu) { | |
1510 | conn->mtu = hcon->hdev->le_mtu; | |
1511 | break; | |
1512 | } | |
1513 | /* fall through */ | |
1514 | ||
1515 | default: | |
acd7d370 | 1516 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1517 | break; |
1518 | } | |
acd7d370 | 1519 | |
1da177e4 LT |
1520 | conn->src = &hcon->hdev->bdaddr; |
1521 | conn->dst = &hcon->dst; | |
1522 | ||
4e8402a3 MH |
1523 | conn->feat_mask = 0; |
1524 | ||
1da177e4 | 1525 | spin_lock_init(&conn->lock); |
3df91ea2 | 1526 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1527 | |
1528 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1529 | |
5d3de7df | 1530 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1531 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1532 | else |
030013d8 | 1533 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1534 | |
9f5a0d7b | 1535 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1536 | |
1da177e4 LT |
1537 | return conn; |
1538 | } | |
1539 | ||
1da177e4 | 1540 | /* ---- Socket interface ---- */ |
1da177e4 | 1541 | |
c2287681 | 1542 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1543 | * Returns closest match. |
1544 | */ | |
c2287681 IY |
1545 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1546 | bdaddr_t *src, | |
1547 | bdaddr_t *dst) | |
1da177e4 | 1548 | { |
23691d75 | 1549 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1550 | |
23691d75 | 1551 | read_lock(&chan_list_lock); |
e0f0cb56 | 1552 | |
23691d75 GP |
1553 | list_for_each_entry(c, &chan_list, global_l) { |
1554 | struct sock *sk = c->sk; | |
fe4128e0 | 1555 | |
89bc500e | 1556 | if (state && c->state != state) |
1da177e4 LT |
1557 | continue; |
1558 | ||
23691d75 | 1559 | if (c->psm == psm) { |
c2287681 IY |
1560 | int src_match, dst_match; |
1561 | int src_any, dst_any; | |
1562 | ||
1da177e4 | 1563 | /* Exact match. */ |
c2287681 IY |
1564 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1565 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1566 | if (src_match && dst_match) { | |
a7567b20 | 1567 | read_unlock(&chan_list_lock); |
23691d75 GP |
1568 | return c; |
1569 | } | |
1da177e4 LT |
1570 | |
1571 | /* Closest match */ | |
c2287681 IY |
1572 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1573 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1574 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1575 | (src_any && dst_any)) | |
23691d75 | 1576 | c1 = c; |
1da177e4 LT |
1577 | } |
1578 | } | |
1da177e4 | 1579 | |
23691d75 | 1580 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1581 | |
23691d75 | 1582 | return c1; |
1da177e4 LT |
1583 | } |
1584 | ||
8e9f9892 AG |
1585 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1586 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1587 | { |
5d41ce1d | 1588 | struct sock *sk = chan->sk; |
1da177e4 | 1589 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1590 | struct l2cap_conn *conn; |
1591 | struct hci_conn *hcon; | |
1592 | struct hci_dev *hdev; | |
09ab6f4c | 1593 | __u8 auth_type; |
44d0e48e | 1594 | int err; |
1da177e4 | 1595 | |
6ed93dc6 | 1596 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst, |
ab19516a | 1597 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1598 | |
af05b30b GP |
1599 | hdev = hci_get_route(dst, src); |
1600 | if (!hdev) | |
1da177e4 LT |
1601 | return -EHOSTUNREACH; |
1602 | ||
09fd0de5 | 1603 | hci_dev_lock(hdev); |
1da177e4 | 1604 | |
6be36555 | 1605 | l2cap_chan_lock(chan); |
03a00194 GP |
1606 | |
1607 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1608 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
2d792818 | 1609 | chan->chan_type != L2CAP_CHAN_RAW) { |
03a00194 GP |
1610 | err = -EINVAL; |
1611 | goto done; | |
1612 | } | |
1613 | ||
1614 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1615 | err = -EINVAL; | |
1616 | goto done; | |
1617 | } | |
1618 | ||
1619 | switch (chan->mode) { | |
1620 | case L2CAP_MODE_BASIC: | |
1621 | break; | |
1622 | case L2CAP_MODE_ERTM: | |
1623 | case L2CAP_MODE_STREAMING: | |
1624 | if (!disable_ertm) | |
1625 | break; | |
1626 | /* fall through */ | |
1627 | default: | |
1628 | err = -ENOTSUPP; | |
1629 | goto done; | |
1630 | } | |
1631 | ||
0797e01d | 1632 | switch (chan->state) { |
03a00194 GP |
1633 | case BT_CONNECT: |
1634 | case BT_CONNECT2: | |
1635 | case BT_CONFIG: | |
1636 | /* Already connecting */ | |
1637 | err = 0; | |
1638 | goto done; | |
1639 | ||
1640 | case BT_CONNECTED: | |
1641 | /* Already connected */ | |
1642 | err = -EISCONN; | |
1643 | goto done; | |
1644 | ||
1645 | case BT_OPEN: | |
1646 | case BT_BOUND: | |
1647 | /* Can connect */ | |
1648 | break; | |
1649 | ||
1650 | default: | |
1651 | err = -EBADFD; | |
1652 | goto done; | |
1653 | } | |
1654 | ||
1655 | /* Set destination address and psm */ | |
0797e01d | 1656 | lock_sock(sk); |
9219b2a0 | 1657 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1658 | release_sock(sk); |
1659 | ||
03a00194 GP |
1660 | chan->psm = psm; |
1661 | chan->dcid = cid; | |
1da177e4 | 1662 | |
4343478f | 1663 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1664 | |
fe4128e0 | 1665 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1666 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1667 | chan->sec_level, auth_type); |
acd7d370 | 1668 | else |
8e9f9892 | 1669 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1670 | chan->sec_level, auth_type); |
acd7d370 | 1671 | |
30e76272 VT |
1672 | if (IS_ERR(hcon)) { |
1673 | err = PTR_ERR(hcon); | |
1da177e4 | 1674 | goto done; |
30e76272 | 1675 | } |
1da177e4 LT |
1676 | |
1677 | conn = l2cap_conn_add(hcon, 0); | |
1678 | if (!conn) { | |
1679 | hci_conn_put(hcon); | |
30e76272 | 1680 | err = -ENOMEM; |
1da177e4 LT |
1681 | goto done; |
1682 | } | |
1683 | ||
9f0caeb1 VCG |
1684 | if (hcon->type == LE_LINK) { |
1685 | err = 0; | |
1686 | ||
1687 | if (!list_empty(&conn->chan_l)) { | |
1688 | err = -EBUSY; | |
1689 | hci_conn_put(hcon); | |
1690 | } | |
1691 | ||
1692 | if (err) | |
1693 | goto done; | |
1694 | } | |
1695 | ||
1da177e4 LT |
1696 | /* Update source addr of the socket */ |
1697 | bacpy(src, conn->src); | |
1698 | ||
6be36555 | 1699 | l2cap_chan_unlock(chan); |
48454079 | 1700 | l2cap_chan_add(conn, chan); |
6be36555 | 1701 | l2cap_chan_lock(chan); |
48454079 | 1702 | |
6be36555 | 1703 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1704 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1705 | |
1706 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1707 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1708 | __clear_chan_timer(chan); |
d45fc423 | 1709 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1710 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1711 | } else |
fc7f8a7e | 1712 | l2cap_do_start(chan); |
1da177e4 LT |
1713 | } |
1714 | ||
30e76272 VT |
1715 | err = 0; |
1716 | ||
1da177e4 | 1717 | done: |
6be36555 | 1718 | l2cap_chan_unlock(chan); |
09fd0de5 | 1719 | hci_dev_unlock(hdev); |
1da177e4 LT |
1720 | hci_dev_put(hdev); |
1721 | return err; | |
1722 | } | |
1723 | ||
dcba0dba | 1724 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1725 | { |
8c1d787b | 1726 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1727 | DECLARE_WAITQUEUE(wait, current); |
1728 | int err = 0; | |
1729 | int timeo = HZ/5; | |
1730 | ||
2b0b05dd | 1731 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1732 | set_current_state(TASK_INTERRUPTIBLE); |
1733 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1734 | if (!timeo) |
1735 | timeo = HZ/5; | |
1736 | ||
1737 | if (signal_pending(current)) { | |
1738 | err = sock_intr_errno(timeo); | |
1739 | break; | |
1740 | } | |
1741 | ||
1742 | release_sock(sk); | |
1743 | timeo = schedule_timeout(timeo); | |
1744 | lock_sock(sk); | |
a71a0cf4 | 1745 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1746 | |
1747 | err = sock_error(sk); | |
1748 | if (err) | |
1749 | break; | |
1750 | } | |
1751 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1752 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1753 | return err; |
1754 | } | |
1755 | ||
721c4181 | 1756 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1757 | { |
721c4181 | 1758 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1759 | monitor_timer.work); |
e90bac06 | 1760 | |
525cd185 | 1761 | BT_DBG("chan %p", chan); |
0e98958d | 1762 | |
6be36555 AE |
1763 | l2cap_chan_lock(chan); |
1764 | ||
80909e04 | 1765 | if (!chan->conn) { |
6be36555 | 1766 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1767 | l2cap_chan_put(chan); |
e90bac06 GP |
1768 | return; |
1769 | } | |
1770 | ||
401bb1f7 | 1771 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1772 | |
6be36555 | 1773 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1774 | l2cap_chan_put(chan); |
e90bac06 GP |
1775 | } |
1776 | ||
721c4181 | 1777 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1778 | { |
721c4181 | 1779 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1780 | retrans_timer.work); |
e90bac06 | 1781 | |
49208c9c | 1782 | BT_DBG("chan %p", chan); |
0e98958d | 1783 | |
6be36555 AE |
1784 | l2cap_chan_lock(chan); |
1785 | ||
80909e04 MM |
1786 | if (!chan->conn) { |
1787 | l2cap_chan_unlock(chan); | |
1788 | l2cap_chan_put(chan); | |
1789 | return; | |
1790 | } | |
6be36555 | 1791 | |
401bb1f7 | 1792 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1793 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1794 | l2cap_chan_put(chan); |
e90bac06 GP |
1795 | } |
1796 | ||
d660366d GP |
1797 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1798 | struct sk_buff_head *skbs) | |
6840ed07 | 1799 | { |
ccbb84af | 1800 | struct sk_buff *skb; |
3733937d | 1801 | struct l2cap_ctrl *control; |
6840ed07 | 1802 | |
3733937d MM |
1803 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1804 | ||
3733937d MM |
1805 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1806 | ||
1807 | while (!skb_queue_empty(&chan->tx_q)) { | |
1808 | ||
1809 | skb = skb_dequeue(&chan->tx_q); | |
1810 | ||
1811 | bt_cb(skb)->control.retries = 1; | |
1812 | control = &bt_cb(skb)->control; | |
1813 | ||
1814 | control->reqseq = 0; | |
1815 | control->txseq = chan->next_tx_seq; | |
1816 | ||
1817 | __pack_control(chan, control, skb); | |
6840ed07 | 1818 | |
47d1ec61 | 1819 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1820 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1821 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1822 | } |
1823 | ||
4343478f | 1824 | l2cap_do_send(chan, skb); |
6840ed07 | 1825 | |
b4400672 | 1826 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1827 | |
836be934 | 1828 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1829 | chan->frames_sent++; |
6840ed07 | 1830 | } |
6840ed07 GP |
1831 | } |
1832 | ||
67c9e840 | 1833 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1834 | { |
1835 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1836 | struct l2cap_ctrl *control; |
1837 | int sent = 0; | |
1838 | ||
1839 | BT_DBG("chan %p", chan); | |
1c2acffb | 1840 | |
89bc500e | 1841 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1842 | return -ENOTCONN; |
e90bac06 | 1843 | |
94122bbe MM |
1844 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1845 | return 0; | |
1846 | ||
18a48e76 MM |
1847 | while (chan->tx_send_head && |
1848 | chan->unacked_frames < chan->remote_tx_win && | |
1849 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1850 | |
18a48e76 | 1851 | skb = chan->tx_send_head; |
e90bac06 | 1852 | |
18a48e76 MM |
1853 | bt_cb(skb)->control.retries = 1; |
1854 | control = &bt_cb(skb)->control; | |
95ffa978 | 1855 | |
e2ab4353 | 1856 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1857 | control->final = 1; |
e2ab4353 | 1858 | |
18a48e76 MM |
1859 | control->reqseq = chan->buffer_seq; |
1860 | chan->last_acked_seq = chan->buffer_seq; | |
1861 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1862 | |
18a48e76 | 1863 | __pack_control(chan, control, skb); |
e90bac06 | 1864 | |
47d1ec61 | 1865 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1866 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1867 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1868 | } |
1869 | ||
18a48e76 MM |
1870 | /* Clone after data has been modified. Data is assumed to be |
1871 | read-only (for locking purposes) on cloned sk_buffs. | |
1872 | */ | |
1873 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1874 | |
18a48e76 MM |
1875 | if (!tx_skb) |
1876 | break; | |
1c2acffb | 1877 | |
18a48e76 | 1878 | __set_retrans_timer(chan); |
836be934 AE |
1879 | |
1880 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1881 | chan->unacked_frames++; |
6a026610 | 1882 | chan->frames_sent++; |
18a48e76 | 1883 | sent++; |
1c2acffb | 1884 | |
58d35f87 GP |
1885 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1886 | chan->tx_send_head = NULL; | |
1c2acffb | 1887 | else |
58d35f87 | 1888 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1889 | |
1890 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1891 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1892 | } |
1893 | ||
b4400672 AE |
1894 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1895 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1896 | |
1897 | return sent; | |
9e917af1 GP |
1898 | } |
1899 | ||
e1fbd4c1 MM |
1900 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1901 | { | |
1902 | struct l2cap_ctrl control; | |
1903 | struct sk_buff *skb; | |
1904 | struct sk_buff *tx_skb; | |
1905 | u16 seq; | |
1906 | ||
1907 | BT_DBG("chan %p", chan); | |
1908 | ||
1909 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1910 | return; | |
1911 | ||
1912 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { | |
1913 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1914 | ||
1915 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1916 | if (!skb) { | |
1917 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1918 | seq); |
e1fbd4c1 MM |
1919 | continue; |
1920 | } | |
1921 | ||
1922 | bt_cb(skb)->control.retries++; | |
1923 | control = bt_cb(skb)->control; | |
1924 | ||
1925 | if (chan->max_tx != 0 && | |
1926 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1927 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
1928 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
1929 | l2cap_seq_list_clear(&chan->retrans_list); | |
1930 | break; | |
1931 | } | |
1932 | ||
1933 | control.reqseq = chan->buffer_seq; | |
1934 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1935 | control.final = 1; | |
1936 | else | |
1937 | control.final = 0; | |
1938 | ||
1939 | if (skb_cloned(skb)) { | |
1940 | /* Cloned sk_buffs are read-only, so we need a | |
1941 | * writeable copy | |
1942 | */ | |
8bcde1f2 | 1943 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1944 | } else { |
8bcde1f2 | 1945 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1946 | } |
1947 | ||
1948 | if (!tx_skb) { | |
1949 | l2cap_seq_list_clear(&chan->retrans_list); | |
1950 | break; | |
1951 | } | |
1952 | ||
1953 | /* Update skb contents */ | |
1954 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1955 | put_unaligned_le32(__pack_extended_control(&control), | |
1956 | tx_skb->data + L2CAP_HDR_SIZE); | |
1957 | } else { | |
1958 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1959 | tx_skb->data + L2CAP_HDR_SIZE); | |
1960 | } | |
1961 | ||
1962 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1963 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1964 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1965 | L2CAP_FCS_SIZE)); | |
1966 | } | |
1967 | ||
1968 | l2cap_do_send(chan, tx_skb); | |
1969 | ||
1970 | BT_DBG("Resent txseq %d", control.txseq); | |
1971 | ||
1972 | chan->last_acked_seq = chan->buffer_seq; | |
1973 | } | |
1974 | } | |
1975 | ||
f80842a8 MM |
1976 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1977 | struct l2cap_ctrl *control) | |
1978 | { | |
1979 | BT_DBG("chan %p, control %p", chan, control); | |
1980 | ||
1981 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1982 | l2cap_ertm_resend(chan); | |
1983 | } | |
1984 | ||
d2a7ac5d MM |
1985 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
1986 | struct l2cap_ctrl *control) | |
1987 | { | |
e1fbd4c1 MM |
1988 | struct sk_buff *skb; |
1989 | ||
1990 | BT_DBG("chan %p, control %p", chan, control); | |
1991 | ||
1992 | if (control->poll) | |
1993 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
1994 | ||
1995 | l2cap_seq_list_clear(&chan->retrans_list); | |
1996 | ||
1997 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1998 | return; | |
1999 | ||
2000 | if (chan->unacked_frames) { | |
2001 | skb_queue_walk(&chan->tx_q, skb) { | |
2002 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2003 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2004 | break; |
2005 | } | |
2006 | ||
2007 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2008 | if (skb == chan->tx_send_head) | |
2009 | break; | |
2010 | ||
2011 | l2cap_seq_list_append(&chan->retrans_list, | |
2012 | bt_cb(skb)->control.txseq); | |
2013 | } | |
2014 | ||
2015 | l2cap_ertm_resend(chan); | |
2016 | } | |
d2a7ac5d MM |
2017 | } |
2018 | ||
0a0aba42 | 2019 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2020 | { |
0a0aba42 MM |
2021 | struct l2cap_ctrl control; |
2022 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2023 | chan->last_acked_seq); | |
2024 | int threshold; | |
9e917af1 | 2025 | |
0a0aba42 MM |
2026 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2027 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2028 | |
0a0aba42 MM |
2029 | memset(&control, 0, sizeof(control)); |
2030 | control.sframe = 1; | |
dfc909be | 2031 | |
0a0aba42 MM |
2032 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2033 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2034 | __clear_ack_timer(chan); | |
2035 | control.super = L2CAP_SUPER_RNR; | |
2036 | control.reqseq = chan->buffer_seq; | |
2037 | l2cap_send_sframe(chan, &control); | |
2038 | } else { | |
2039 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2040 | l2cap_ertm_send(chan); | |
2041 | /* If any i-frames were sent, they included an ack */ | |
2042 | if (chan->buffer_seq == chan->last_acked_seq) | |
2043 | frames_to_ack = 0; | |
2044 | } | |
dfc909be | 2045 | |
c20f8e35 | 2046 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2047 | * Calculate without mul or div |
2048 | */ | |
c20f8e35 | 2049 | threshold = chan->ack_win; |
0a0aba42 MM |
2050 | threshold += threshold << 1; |
2051 | threshold >>= 2; | |
2052 | ||
b4400672 | 2053 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2054 | threshold); |
2055 | ||
2056 | if (frames_to_ack >= threshold) { | |
2057 | __clear_ack_timer(chan); | |
2058 | control.super = L2CAP_SUPER_RR; | |
2059 | control.reqseq = chan->buffer_seq; | |
2060 | l2cap_send_sframe(chan, &control); | |
2061 | frames_to_ack = 0; | |
2062 | } | |
1c2acffb | 2063 | |
0a0aba42 MM |
2064 | if (frames_to_ack) |
2065 | __set_ack_timer(chan); | |
2066 | } | |
b17e73bb SJ |
2067 | } |
2068 | ||
04124681 GP |
2069 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2070 | struct msghdr *msg, int len, | |
2071 | int count, struct sk_buff *skb) | |
1c2acffb | 2072 | { |
0952a57a | 2073 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2074 | struct sk_buff **frag; |
90338947 | 2075 | int sent = 0; |
1da177e4 | 2076 | |
59203a21 | 2077 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 2078 | return -EFAULT; |
1da177e4 LT |
2079 | |
2080 | sent += count; | |
2081 | len -= count; | |
2082 | ||
2083 | /* Continuation fragments (no L2CAP header) */ | |
2084 | frag = &skb_shinfo(skb)->frag_list; | |
2085 | while (len) { | |
fbe00700 GP |
2086 | struct sk_buff *tmp; |
2087 | ||
1da177e4 LT |
2088 | count = min_t(unsigned int, conn->mtu, len); |
2089 | ||
fbe00700 GP |
2090 | tmp = chan->ops->alloc_skb(chan, count, |
2091 | msg->msg_flags & MSG_DONTWAIT); | |
2092 | if (IS_ERR(tmp)) | |
2093 | return PTR_ERR(tmp); | |
2094 | ||
2095 | *frag = tmp; | |
2f7719ce | 2096 | |
1c2acffb GP |
2097 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
2098 | return -EFAULT; | |
1da177e4 | 2099 | |
5e59b791 LAD |
2100 | (*frag)->priority = skb->priority; |
2101 | ||
1da177e4 LT |
2102 | sent += count; |
2103 | len -= count; | |
2104 | ||
2d0ed3d5 GP |
2105 | skb->len += (*frag)->len; |
2106 | skb->data_len += (*frag)->len; | |
2107 | ||
1da177e4 LT |
2108 | frag = &(*frag)->next; |
2109 | } | |
1da177e4 LT |
2110 | |
2111 | return sent; | |
1c2acffb | 2112 | } |
1da177e4 | 2113 | |
5e59b791 | 2114 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2115 | struct msghdr *msg, size_t len, |
2116 | u32 priority) | |
1c2acffb | 2117 | { |
8c1d787b | 2118 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2119 | struct sk_buff *skb; |
03a51213 | 2120 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2121 | struct l2cap_hdr *lh; |
2122 | ||
b4400672 | 2123 | BT_DBG("chan %p len %zu priority %u", chan, len, priority); |
1c2acffb GP |
2124 | |
2125 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2126 | |
2127 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2128 | msg->msg_flags & MSG_DONTWAIT); |
2129 | if (IS_ERR(skb)) | |
2130 | return skb; | |
1c2acffb | 2131 | |
5e59b791 LAD |
2132 | skb->priority = priority; |
2133 | ||
1c2acffb GP |
2134 | /* Create L2CAP header */ |
2135 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2136 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
2137 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2138 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 2139 | |
0952a57a | 2140 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2141 | if (unlikely(err < 0)) { |
2142 | kfree_skb(skb); | |
2143 | return ERR_PTR(err); | |
2144 | } | |
2145 | return skb; | |
2146 | } | |
2147 | ||
5e59b791 | 2148 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2149 | struct msghdr *msg, size_t len, |
2150 | u32 priority) | |
1c2acffb | 2151 | { |
8c1d787b | 2152 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2153 | struct sk_buff *skb; |
f2ba7fae | 2154 | int err, count; |
1c2acffb GP |
2155 | struct l2cap_hdr *lh; |
2156 | ||
b4400672 | 2157 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2158 | |
f2ba7fae | 2159 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2160 | |
f2ba7fae | 2161 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2162 | msg->msg_flags & MSG_DONTWAIT); |
2163 | if (IS_ERR(skb)) | |
2164 | return skb; | |
1c2acffb | 2165 | |
5e59b791 LAD |
2166 | skb->priority = priority; |
2167 | ||
1c2acffb GP |
2168 | /* Create L2CAP header */ |
2169 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2170 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2171 | lh->len = cpu_to_le16(len); |
1c2acffb | 2172 | |
0952a57a | 2173 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2174 | if (unlikely(err < 0)) { |
2175 | kfree_skb(skb); | |
2176 | return ERR_PTR(err); | |
2177 | } | |
2178 | return skb; | |
2179 | } | |
2180 | ||
ab0ff76d | 2181 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2182 | struct msghdr *msg, size_t len, |
2183 | u16 sdulen) | |
1c2acffb | 2184 | { |
8c1d787b | 2185 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2186 | struct sk_buff *skb; |
e4ca6d98 | 2187 | int err, count, hlen; |
1c2acffb GP |
2188 | struct l2cap_hdr *lh; |
2189 | ||
b4400672 | 2190 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2191 | |
0ee0d208 GP |
2192 | if (!conn) |
2193 | return ERR_PTR(-ENOTCONN); | |
2194 | ||
ba7aa64f | 2195 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2196 | |
c74e560c | 2197 | if (sdulen) |
03a51213 | 2198 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2199 | |
47d1ec61 | 2200 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2201 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2202 | |
1c2acffb | 2203 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2204 | |
2205 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2206 | msg->msg_flags & MSG_DONTWAIT); |
2207 | if (IS_ERR(skb)) | |
2208 | return skb; | |
1c2acffb GP |
2209 | |
2210 | /* Create L2CAP header */ | |
2211 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2212 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2213 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2214 | |
18a48e76 MM |
2215 | /* Control header is populated later */ |
2216 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2217 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2218 | else | |
2219 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2220 | |
c74e560c | 2221 | if (sdulen) |
03a51213 | 2222 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2223 | |
0952a57a | 2224 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2225 | if (unlikely(err < 0)) { |
2226 | kfree_skb(skb); | |
2227 | return ERR_PTR(err); | |
2228 | } | |
e90bac06 | 2229 | |
18a48e76 | 2230 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2231 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2232 | return skb; |
1da177e4 LT |
2233 | } |
2234 | ||
94122bbe MM |
2235 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2236 | struct sk_buff_head *seg_queue, | |
2237 | struct msghdr *msg, size_t len) | |
c74e560c | 2238 | { |
c74e560c | 2239 | struct sk_buff *skb; |
94122bbe MM |
2240 | u16 sdu_len; |
2241 | size_t pdu_len; | |
94122bbe | 2242 | u8 sar; |
c74e560c | 2243 | |
b4400672 | 2244 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2245 | |
94122bbe MM |
2246 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2247 | * so fragmented skbs are not used. The HCI layer's handling | |
2248 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2249 | */ | |
c74e560c | 2250 | |
94122bbe MM |
2251 | /* PDU size is derived from the HCI MTU */ |
2252 | pdu_len = chan->conn->mtu; | |
c74e560c | 2253 | |
94122bbe MM |
2254 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2255 | ||
2256 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2257 | if (chan->fcs) |
2258 | pdu_len -= L2CAP_FCS_SIZE; | |
2259 | ||
ba7aa64f | 2260 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2261 | |
2262 | /* Remote device may have requested smaller PDUs */ | |
2263 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2264 | ||
2265 | if (len <= pdu_len) { | |
2266 | sar = L2CAP_SAR_UNSEGMENTED; | |
2267 | sdu_len = 0; | |
2268 | pdu_len = len; | |
2269 | } else { | |
2270 | sar = L2CAP_SAR_START; | |
2271 | sdu_len = len; | |
2272 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2273 | } | |
2274 | ||
2275 | while (len > 0) { | |
2276 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2277 | |
c74e560c | 2278 | if (IS_ERR(skb)) { |
94122bbe | 2279 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2280 | return PTR_ERR(skb); |
2281 | } | |
2282 | ||
94122bbe MM |
2283 | bt_cb(skb)->control.sar = sar; |
2284 | __skb_queue_tail(seg_queue, skb); | |
2285 | ||
2286 | len -= pdu_len; | |
2287 | if (sdu_len) { | |
2288 | sdu_len = 0; | |
2289 | pdu_len += L2CAP_SDULEN_SIZE; | |
2290 | } | |
2291 | ||
2292 | if (len <= pdu_len) { | |
2293 | sar = L2CAP_SAR_END; | |
2294 | pdu_len = len; | |
2295 | } else { | |
2296 | sar = L2CAP_SAR_CONTINUE; | |
2297 | } | |
c74e560c | 2298 | } |
c74e560c | 2299 | |
f0f62799 | 2300 | return 0; |
c74e560c GP |
2301 | } |
2302 | ||
5e59b791 | 2303 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2304 | u32 priority) |
9a91a04a | 2305 | { |
9a91a04a | 2306 | struct sk_buff *skb; |
9a91a04a | 2307 | int err; |
94122bbe | 2308 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2309 | |
2310 | /* Connectionless channel */ | |
715ec005 | 2311 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2312 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2313 | if (IS_ERR(skb)) |
2314 | return PTR_ERR(skb); | |
2315 | ||
2316 | l2cap_do_send(chan, skb); | |
2317 | return len; | |
2318 | } | |
2319 | ||
2320 | switch (chan->mode) { | |
2321 | case L2CAP_MODE_BASIC: | |
2322 | /* Check outgoing MTU */ | |
2323 | if (len > chan->omtu) | |
2324 | return -EMSGSIZE; | |
2325 | ||
2326 | /* Create a basic PDU */ | |
5e59b791 | 2327 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2328 | if (IS_ERR(skb)) |
2329 | return PTR_ERR(skb); | |
2330 | ||
2331 | l2cap_do_send(chan, skb); | |
2332 | err = len; | |
2333 | break; | |
2334 | ||
2335 | case L2CAP_MODE_ERTM: | |
2336 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2337 | /* Check outgoing MTU */ |
2338 | if (len > chan->omtu) { | |
2339 | err = -EMSGSIZE; | |
2340 | break; | |
2341 | } | |
9a91a04a | 2342 | |
94122bbe | 2343 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2344 | |
94122bbe MM |
2345 | /* Do segmentation before calling in to the state machine, |
2346 | * since it's possible to block while waiting for memory | |
2347 | * allocation. | |
2348 | */ | |
2349 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2350 | |
94122bbe MM |
2351 | /* The channel could have been closed while segmenting, |
2352 | * check that it is still connected. | |
2353 | */ | |
2354 | if (chan->state != BT_CONNECTED) { | |
2355 | __skb_queue_purge(&seg_queue); | |
2356 | err = -ENOTCONN; | |
9a91a04a GP |
2357 | } |
2358 | ||
94122bbe | 2359 | if (err) |
9a91a04a | 2360 | break; |
9a91a04a | 2361 | |
3733937d | 2362 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2363 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2364 | else |
d660366d | 2365 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2366 | |
d660366d | 2367 | err = len; |
9a91a04a | 2368 | |
94122bbe MM |
2369 | /* If the skbs were not queued for sending, they'll still be in |
2370 | * seg_queue and need to be purged. | |
2371 | */ | |
2372 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2373 | break; |
2374 | ||
2375 | default: | |
2376 | BT_DBG("bad state %1.1x", chan->mode); | |
2377 | err = -EBADFD; | |
2378 | } | |
2379 | ||
2380 | return err; | |
2381 | } | |
2382 | ||
d2a7ac5d MM |
2383 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2384 | { | |
bed68bde MM |
2385 | struct l2cap_ctrl control; |
2386 | u16 seq; | |
2387 | ||
b4400672 | 2388 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2389 | |
2390 | memset(&control, 0, sizeof(control)); | |
2391 | control.sframe = 1; | |
2392 | control.super = L2CAP_SUPER_SREJ; | |
2393 | ||
2394 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2395 | seq = __next_seq(chan, seq)) { | |
2396 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2397 | control.reqseq = seq; | |
2398 | l2cap_send_sframe(chan, &control); | |
2399 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2400 | } | |
2401 | } | |
2402 | ||
2403 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2404 | } |
2405 | ||
2406 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2407 | { | |
bed68bde MM |
2408 | struct l2cap_ctrl control; |
2409 | ||
2410 | BT_DBG("chan %p", chan); | |
2411 | ||
2412 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2413 | return; | |
2414 | ||
2415 | memset(&control, 0, sizeof(control)); | |
2416 | control.sframe = 1; | |
2417 | control.super = L2CAP_SUPER_SREJ; | |
2418 | control.reqseq = chan->srej_list.tail; | |
2419 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2420 | } |
2421 | ||
2422 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2423 | { | |
bed68bde MM |
2424 | struct l2cap_ctrl control; |
2425 | u16 initial_head; | |
2426 | u16 seq; | |
2427 | ||
b4400672 | 2428 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2429 | |
2430 | memset(&control, 0, sizeof(control)); | |
2431 | control.sframe = 1; | |
2432 | control.super = L2CAP_SUPER_SREJ; | |
2433 | ||
2434 | /* Capture initial list head to allow only one pass through the list. */ | |
2435 | initial_head = chan->srej_list.head; | |
2436 | ||
2437 | do { | |
2438 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2439 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2440 | break; | |
2441 | ||
2442 | control.reqseq = seq; | |
2443 | l2cap_send_sframe(chan, &control); | |
2444 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2445 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2446 | } |
2447 | ||
608bcc6d MM |
2448 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2449 | { | |
2450 | struct sk_buff *acked_skb; | |
2451 | u16 ackseq; | |
2452 | ||
b4400672 | 2453 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2454 | |
2455 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2456 | return; | |
2457 | ||
b4400672 | 2458 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2459 | chan->expected_ack_seq, chan->unacked_frames); |
2460 | ||
2461 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2462 | ackseq = __next_seq(chan, ackseq)) { | |
2463 | ||
2464 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2465 | if (acked_skb) { | |
2466 | skb_unlink(acked_skb, &chan->tx_q); | |
2467 | kfree_skb(acked_skb); | |
2468 | chan->unacked_frames--; | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | chan->expected_ack_seq = reqseq; | |
2473 | ||
2474 | if (chan->unacked_frames == 0) | |
2475 | __clear_retrans_timer(chan); | |
2476 | ||
b4400672 | 2477 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2478 | } |
2479 | ||
2480 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2481 | { | |
2482 | BT_DBG("chan %p", chan); | |
2483 | ||
2484 | chan->expected_tx_seq = chan->buffer_seq; | |
2485 | l2cap_seq_list_clear(&chan->srej_list); | |
2486 | skb_queue_purge(&chan->srej_q); | |
2487 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2488 | } | |
2489 | ||
d660366d GP |
2490 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2491 | struct l2cap_ctrl *control, | |
2492 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2493 | { |
608bcc6d MM |
2494 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2495 | event); | |
2496 | ||
2497 | switch (event) { | |
2498 | case L2CAP_EV_DATA_REQUEST: | |
2499 | if (chan->tx_send_head == NULL) | |
2500 | chan->tx_send_head = skb_peek(skbs); | |
2501 | ||
2502 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2503 | l2cap_ertm_send(chan); | |
2504 | break; | |
2505 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2506 | BT_DBG("Enter LOCAL_BUSY"); | |
2507 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2508 | ||
2509 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2510 | /* The SREJ_SENT state must be aborted if we are to | |
2511 | * enter the LOCAL_BUSY state. | |
2512 | */ | |
2513 | l2cap_abort_rx_srej_sent(chan); | |
2514 | } | |
2515 | ||
2516 | l2cap_send_ack(chan); | |
2517 | ||
2518 | break; | |
2519 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2520 | BT_DBG("Exit LOCAL_BUSY"); | |
2521 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2522 | ||
2523 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2524 | struct l2cap_ctrl local_control; | |
2525 | ||
2526 | memset(&local_control, 0, sizeof(local_control)); | |
2527 | local_control.sframe = 1; | |
2528 | local_control.super = L2CAP_SUPER_RR; | |
2529 | local_control.poll = 1; | |
2530 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2531 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2532 | |
2533 | chan->retry_count = 1; | |
2534 | __set_monitor_timer(chan); | |
2535 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2536 | } | |
2537 | break; | |
2538 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2539 | l2cap_process_reqseq(chan, control->reqseq); | |
2540 | break; | |
2541 | case L2CAP_EV_EXPLICIT_POLL: | |
2542 | l2cap_send_rr_or_rnr(chan, 1); | |
2543 | chan->retry_count = 1; | |
2544 | __set_monitor_timer(chan); | |
2545 | __clear_ack_timer(chan); | |
2546 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2547 | break; | |
2548 | case L2CAP_EV_RETRANS_TO: | |
2549 | l2cap_send_rr_or_rnr(chan, 1); | |
2550 | chan->retry_count = 1; | |
2551 | __set_monitor_timer(chan); | |
2552 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2553 | break; | |
2554 | case L2CAP_EV_RECV_FBIT: | |
2555 | /* Nothing to process */ | |
2556 | break; | |
2557 | default: | |
2558 | break; | |
2559 | } | |
608bcc6d MM |
2560 | } |
2561 | ||
d660366d GP |
2562 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2563 | struct l2cap_ctrl *control, | |
2564 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2565 | { |
608bcc6d MM |
2566 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2567 | event); | |
2568 | ||
2569 | switch (event) { | |
2570 | case L2CAP_EV_DATA_REQUEST: | |
2571 | if (chan->tx_send_head == NULL) | |
2572 | chan->tx_send_head = skb_peek(skbs); | |
2573 | /* Queue data, but don't send. */ | |
2574 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2575 | break; | |
2576 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2577 | BT_DBG("Enter LOCAL_BUSY"); | |
2578 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2579 | ||
2580 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2581 | /* The SREJ_SENT state must be aborted if we are to | |
2582 | * enter the LOCAL_BUSY state. | |
2583 | */ | |
2584 | l2cap_abort_rx_srej_sent(chan); | |
2585 | } | |
2586 | ||
2587 | l2cap_send_ack(chan); | |
2588 | ||
2589 | break; | |
2590 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2591 | BT_DBG("Exit LOCAL_BUSY"); | |
2592 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2593 | ||
2594 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2595 | struct l2cap_ctrl local_control; | |
2596 | memset(&local_control, 0, sizeof(local_control)); | |
2597 | local_control.sframe = 1; | |
2598 | local_control.super = L2CAP_SUPER_RR; | |
2599 | local_control.poll = 1; | |
2600 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2601 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2602 | |
2603 | chan->retry_count = 1; | |
2604 | __set_monitor_timer(chan); | |
2605 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2606 | } | |
2607 | break; | |
2608 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2609 | l2cap_process_reqseq(chan, control->reqseq); | |
2610 | ||
2611 | /* Fall through */ | |
2612 | ||
2613 | case L2CAP_EV_RECV_FBIT: | |
2614 | if (control && control->final) { | |
2615 | __clear_monitor_timer(chan); | |
2616 | if (chan->unacked_frames > 0) | |
2617 | __set_retrans_timer(chan); | |
2618 | chan->retry_count = 0; | |
2619 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2620 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2621 | } | |
2622 | break; | |
2623 | case L2CAP_EV_EXPLICIT_POLL: | |
2624 | /* Ignore */ | |
2625 | break; | |
2626 | case L2CAP_EV_MONITOR_TO: | |
2627 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2628 | l2cap_send_rr_or_rnr(chan, 1); | |
2629 | __set_monitor_timer(chan); | |
2630 | chan->retry_count++; | |
2631 | } else { | |
2632 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); | |
2633 | } | |
2634 | break; | |
2635 | default: | |
2636 | break; | |
2637 | } | |
608bcc6d MM |
2638 | } |
2639 | ||
d660366d GP |
2640 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2641 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2642 | { |
608bcc6d MM |
2643 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2644 | chan, control, skbs, event, chan->tx_state); | |
2645 | ||
2646 | switch (chan->tx_state) { | |
2647 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2648 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2649 | break; |
2650 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2651 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2652 | break; |
2653 | default: | |
2654 | /* Ignore event */ | |
2655 | break; | |
2656 | } | |
608bcc6d MM |
2657 | } |
2658 | ||
4b51dae9 MM |
2659 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2660 | struct l2cap_ctrl *control) | |
2661 | { | |
2662 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2663 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2664 | } |
2665 | ||
f80842a8 MM |
2666 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2667 | struct l2cap_ctrl *control) | |
2668 | { | |
2669 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2670 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2671 | } |
2672 | ||
1da177e4 LT |
2673 | /* Copy frame to all raw sockets on that connection */ |
2674 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2675 | { | |
1da177e4 | 2676 | struct sk_buff *nskb; |
48454079 | 2677 | struct l2cap_chan *chan; |
1da177e4 LT |
2678 | |
2679 | BT_DBG("conn %p", conn); | |
2680 | ||
3df91ea2 | 2681 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2682 | |
3df91ea2 | 2683 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2684 | struct sock *sk = chan->sk; |
715ec005 | 2685 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2686 | continue; |
2687 | ||
2688 | /* Don't send frame to the socket it came from */ | |
2689 | if (skb->sk == sk) | |
2690 | continue; | |
8bcde1f2 | 2691 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2692 | if (!nskb) |
1da177e4 LT |
2693 | continue; |
2694 | ||
80b98027 | 2695 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2696 | kfree_skb(nskb); |
2697 | } | |
3d57dc68 | 2698 | |
3df91ea2 | 2699 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2700 | } |
2701 | ||
2702 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2703 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2704 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2705 | { |
2706 | struct sk_buff *skb, **frag; | |
2707 | struct l2cap_cmd_hdr *cmd; | |
2708 | struct l2cap_hdr *lh; | |
2709 | int len, count; | |
2710 | ||
b4400672 AE |
2711 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2712 | conn, code, ident, dlen); | |
1da177e4 LT |
2713 | |
2714 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2715 | count = min_t(unsigned int, conn->mtu, len); | |
2716 | ||
8bcde1f2 | 2717 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2718 | if (!skb) |
2719 | return NULL; | |
2720 | ||
2721 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2722 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2723 | |
2724 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2725 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2726 | else |
ac73498c | 2727 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2728 | |
2729 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2730 | cmd->code = code; | |
2731 | cmd->ident = ident; | |
aca3192c | 2732 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2733 | |
2734 | if (dlen) { | |
2735 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2736 | memcpy(skb_put(skb, count), data, count); | |
2737 | data += count; | |
2738 | } | |
2739 | ||
2740 | len -= skb->len; | |
2741 | ||
2742 | /* Continuation fragments (no L2CAP header) */ | |
2743 | frag = &skb_shinfo(skb)->frag_list; | |
2744 | while (len) { | |
2745 | count = min_t(unsigned int, conn->mtu, len); | |
2746 | ||
8bcde1f2 | 2747 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2748 | if (!*frag) |
2749 | goto fail; | |
2750 | ||
2751 | memcpy(skb_put(*frag, count), data, count); | |
2752 | ||
2753 | len -= count; | |
2754 | data += count; | |
2755 | ||
2756 | frag = &(*frag)->next; | |
2757 | } | |
2758 | ||
2759 | return skb; | |
2760 | ||
2761 | fail: | |
2762 | kfree_skb(skb); | |
2763 | return NULL; | |
2764 | } | |
2765 | ||
2d792818 GP |
2766 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2767 | unsigned long *val) | |
1da177e4 LT |
2768 | { |
2769 | struct l2cap_conf_opt *opt = *ptr; | |
2770 | int len; | |
2771 | ||
2772 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2773 | *ptr += len; | |
2774 | ||
2775 | *type = opt->type; | |
2776 | *olen = opt->len; | |
2777 | ||
2778 | switch (opt->len) { | |
2779 | case 1: | |
2780 | *val = *((u8 *) opt->val); | |
2781 | break; | |
2782 | ||
2783 | case 2: | |
bfaaeb3e | 2784 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2785 | break; |
2786 | ||
2787 | case 4: | |
bfaaeb3e | 2788 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2789 | break; |
2790 | ||
2791 | default: | |
2792 | *val = (unsigned long) opt->val; | |
2793 | break; | |
2794 | } | |
2795 | ||
b4400672 | 2796 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2797 | return len; |
2798 | } | |
2799 | ||
1da177e4 LT |
2800 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2801 | { | |
2802 | struct l2cap_conf_opt *opt = *ptr; | |
2803 | ||
b4400672 | 2804 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2805 | |
2806 | opt->type = type; | |
2807 | opt->len = len; | |
2808 | ||
2809 | switch (len) { | |
2810 | case 1: | |
2811 | *((u8 *) opt->val) = val; | |
2812 | break; | |
2813 | ||
2814 | case 2: | |
4f8b691c | 2815 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2816 | break; |
2817 | ||
2818 | case 4: | |
4f8b691c | 2819 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2820 | break; |
2821 | ||
2822 | default: | |
2823 | memcpy(opt->val, (void *) val, len); | |
2824 | break; | |
2825 | } | |
2826 | ||
2827 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2828 | } | |
2829 | ||
f89cef09 AE |
2830 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2831 | { | |
2832 | struct l2cap_conf_efs efs; | |
2833 | ||
1ec918ce | 2834 | switch (chan->mode) { |
f89cef09 AE |
2835 | case L2CAP_MODE_ERTM: |
2836 | efs.id = chan->local_id; | |
2837 | efs.stype = chan->local_stype; | |
2838 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2839 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2840 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2841 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2842 | break; |
2843 | ||
2844 | case L2CAP_MODE_STREAMING: | |
2845 | efs.id = 1; | |
2846 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2847 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2848 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2849 | efs.acc_lat = 0; | |
2850 | efs.flush_to = 0; | |
2851 | break; | |
2852 | ||
2853 | default: | |
2854 | return; | |
2855 | } | |
2856 | ||
2857 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 2858 | (unsigned long) &efs); |
f89cef09 AE |
2859 | } |
2860 | ||
721c4181 | 2861 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2862 | { |
721c4181 | 2863 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
2864 | ack_timer.work); |
2865 | u16 frames_to_ack; | |
c1b4f43b | 2866 | |
2fb9b3d4 GP |
2867 | BT_DBG("chan %p", chan); |
2868 | ||
6be36555 AE |
2869 | l2cap_chan_lock(chan); |
2870 | ||
0362520b MM |
2871 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
2872 | chan->last_acked_seq); | |
6be36555 | 2873 | |
0362520b MM |
2874 | if (frames_to_ack) |
2875 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 2876 | |
0362520b | 2877 | l2cap_chan_unlock(chan); |
09bfb2ee | 2878 | l2cap_chan_put(chan); |
c1b4f43b GP |
2879 | } |
2880 | ||
466f8004 | 2881 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2882 | { |
3c588192 MM |
2883 | int err; |
2884 | ||
105bdf9e MM |
2885 | chan->next_tx_seq = 0; |
2886 | chan->expected_tx_seq = 0; | |
42e5c802 | 2887 | chan->expected_ack_seq = 0; |
6a026610 | 2888 | chan->unacked_frames = 0; |
42e5c802 | 2889 | chan->buffer_seq = 0; |
6a026610 | 2890 | chan->frames_sent = 0; |
105bdf9e MM |
2891 | chan->last_acked_seq = 0; |
2892 | chan->sdu = NULL; | |
2893 | chan->sdu_last_frag = NULL; | |
2894 | chan->sdu_len = 0; | |
2895 | ||
d34c34fb MM |
2896 | skb_queue_head_init(&chan->tx_q); |
2897 | ||
08333283 MM |
2898 | chan->local_amp_id = 0; |
2899 | chan->move_id = 0; | |
2900 | chan->move_state = L2CAP_MOVE_STABLE; | |
2901 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
2902 | ||
105bdf9e MM |
2903 | if (chan->mode != L2CAP_MODE_ERTM) |
2904 | return 0; | |
2905 | ||
2906 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2907 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2908 | |
721c4181 GP |
2909 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2910 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2911 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2912 | |
f1c6775b | 2913 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2914 | |
3c588192 MM |
2915 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2916 | if (err < 0) | |
2917 | return err; | |
2918 | ||
9dc9affc MM |
2919 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
2920 | if (err < 0) | |
2921 | l2cap_seq_list_free(&chan->srej_list); | |
2922 | ||
2923 | return err; | |
0565c1c2 GP |
2924 | } |
2925 | ||
f2fcfcd6 GP |
2926 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2927 | { | |
2928 | switch (mode) { | |
2929 | case L2CAP_MODE_STREAMING: | |
2930 | case L2CAP_MODE_ERTM: | |
2931 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2932 | return mode; | |
2933 | /* fall through */ | |
2934 | default: | |
2935 | return L2CAP_MODE_BASIC; | |
2936 | } | |
2937 | } | |
2938 | ||
6327eb98 AE |
2939 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2940 | { | |
2941 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2942 | } | |
2943 | ||
f89cef09 AE |
2944 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2945 | { | |
2946 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2947 | } | |
2948 | ||
6327eb98 AE |
2949 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2950 | { | |
2951 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
2d792818 | 2952 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2953 | /* use extended control field */ |
2954 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2955 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2956 | } else { | |
6327eb98 | 2957 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 2958 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
2959 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2960 | } | |
c20f8e35 | 2961 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
2962 | } |
2963 | ||
710f9b0a | 2964 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2965 | { |
1da177e4 | 2966 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2967 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2968 | void *ptr = req->data; |
c8f79162 | 2969 | u16 size; |
1da177e4 | 2970 | |
49208c9c | 2971 | BT_DBG("chan %p", chan); |
1da177e4 | 2972 | |
73ffa904 | 2973 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2974 | goto done; |
2975 | ||
0c1bc5c6 | 2976 | switch (chan->mode) { |
f2fcfcd6 GP |
2977 | case L2CAP_MODE_STREAMING: |
2978 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2979 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2980 | break; |
85eb53c6 | 2981 | |
f89cef09 AE |
2982 | if (__l2cap_efs_supported(chan)) |
2983 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2984 | ||
2ba13ed6 | 2985 | /* fall through */ |
f2fcfcd6 | 2986 | default: |
8c1d787b | 2987 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2988 | break; |
2989 | } | |
2990 | ||
2991 | done: | |
0c1bc5c6 GP |
2992 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2993 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2994 | |
0c1bc5c6 | 2995 | switch (chan->mode) { |
65c7c491 | 2996 | case L2CAP_MODE_BASIC: |
8c1d787b | 2997 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 2998 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
2999 | break; |
3000 | ||
62547752 GP |
3001 | rfc.mode = L2CAP_MODE_BASIC; |
3002 | rfc.txwin_size = 0; | |
3003 | rfc.max_transmit = 0; | |
3004 | rfc.retrans_timeout = 0; | |
3005 | rfc.monitor_timeout = 0; | |
3006 | rfc.max_pdu_size = 0; | |
3007 | ||
63406504 | 3008 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3009 | (unsigned long) &rfc); |
65c7c491 MH |
3010 | break; |
3011 | ||
3012 | case L2CAP_MODE_ERTM: | |
3013 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3014 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
3015 | rfc.retrans_timeout = 0; |
3016 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3017 | |
3018 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3019 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3020 | L2CAP_FCS_SIZE); | |
c8f79162 | 3021 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3022 | |
6327eb98 AE |
3023 | l2cap_txwin_setup(chan); |
3024 | ||
3025 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3026 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3027 | |
63406504 | 3028 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3029 | (unsigned long) &rfc); |
63406504 | 3030 | |
f89cef09 AE |
3031 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3032 | l2cap_add_opt_efs(&ptr, chan); | |
3033 | ||
8c1d787b | 3034 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
3035 | break; |
3036 | ||
47d1ec61 | 3037 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 3038 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
3039 | chan->fcs = L2CAP_FCS_NONE; |
3040 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 3041 | } |
6327eb98 AE |
3042 | |
3043 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3044 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3045 | chan->tx_win); |
f2fcfcd6 GP |
3046 | break; |
3047 | ||
3048 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3049 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3050 | rfc.mode = L2CAP_MODE_STREAMING; |
3051 | rfc.txwin_size = 0; | |
3052 | rfc.max_transmit = 0; | |
3053 | rfc.retrans_timeout = 0; | |
3054 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3055 | |
3056 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3057 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3058 | L2CAP_FCS_SIZE); | |
c8f79162 | 3059 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3060 | |
63406504 | 3061 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3062 | (unsigned long) &rfc); |
63406504 | 3063 | |
f89cef09 AE |
3064 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3065 | l2cap_add_opt_efs(&ptr, chan); | |
3066 | ||
8c1d787b | 3067 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
3068 | break; |
3069 | ||
47d1ec61 | 3070 | if (chan->fcs == L2CAP_FCS_NONE || |
2d792818 | 3071 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
3072 | chan->fcs = L2CAP_FCS_NONE; |
3073 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 3074 | } |
65c7c491 MH |
3075 | break; |
3076 | } | |
1da177e4 | 3077 | |
fe4128e0 | 3078 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3079 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
3080 | |
3081 | return ptr - data; | |
3082 | } | |
3083 | ||
73ffa904 | 3084 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3085 | { |
5dee9e7c MH |
3086 | struct l2cap_conf_rsp *rsp = data; |
3087 | void *ptr = rsp->data; | |
73ffa904 GP |
3088 | void *req = chan->conf_req; |
3089 | int len = chan->conf_len; | |
5dee9e7c MH |
3090 | int type, hint, olen; |
3091 | unsigned long val; | |
6464f35f | 3092 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3093 | struct l2cap_conf_efs efs; |
3094 | u8 remote_efs = 0; | |
861d6882 | 3095 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3096 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3097 | u16 size; |
1da177e4 | 3098 | |
73ffa904 | 3099 | BT_DBG("chan %p", chan); |
820ae1b8 | 3100 | |
5dee9e7c MH |
3101 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3102 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3103 | |
589d2746 | 3104 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3105 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3106 | |
3107 | switch (type) { | |
3108 | case L2CAP_CONF_MTU: | |
861d6882 | 3109 | mtu = val; |
5dee9e7c MH |
3110 | break; |
3111 | ||
3112 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3113 | chan->flush_to = val; |
5dee9e7c MH |
3114 | break; |
3115 | ||
3116 | case L2CAP_CONF_QOS: | |
3117 | break; | |
3118 | ||
6464f35f MH |
3119 | case L2CAP_CONF_RFC: |
3120 | if (olen == sizeof(rfc)) | |
3121 | memcpy(&rfc, (void *) val, olen); | |
3122 | break; | |
3123 | ||
fcc203c3 GP |
3124 | case L2CAP_CONF_FCS: |
3125 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 3126 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 3127 | break; |
fcc203c3 | 3128 | |
42dceae2 AE |
3129 | case L2CAP_CONF_EFS: |
3130 | remote_efs = 1; | |
3131 | if (olen == sizeof(efs)) | |
3132 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3133 | break; |
3134 | ||
6327eb98 AE |
3135 | case L2CAP_CONF_EWS: |
3136 | if (!enable_hs) | |
3137 | return -ECONNREFUSED; | |
fcc203c3 | 3138 | |
6327eb98 AE |
3139 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3140 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3141 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3142 | chan->remote_tx_win = val; |
fcc203c3 GP |
3143 | break; |
3144 | ||
5dee9e7c MH |
3145 | default: |
3146 | if (hint) | |
3147 | break; | |
3148 | ||
3149 | result = L2CAP_CONF_UNKNOWN; | |
3150 | *((u8 *) ptr++) = type; | |
3151 | break; | |
3152 | } | |
3153 | } | |
3154 | ||
73ffa904 | 3155 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3156 | goto done; |
3157 | ||
0c1bc5c6 | 3158 | switch (chan->mode) { |
f2fcfcd6 GP |
3159 | case L2CAP_MODE_STREAMING: |
3160 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3161 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3162 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3163 | chan->conn->feat_mask); |
85eb53c6 GP |
3164 | break; |
3165 | } | |
3166 | ||
42dceae2 AE |
3167 | if (remote_efs) { |
3168 | if (__l2cap_efs_supported(chan)) | |
3169 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
3170 | else | |
3171 | return -ECONNREFUSED; | |
3172 | } | |
3173 | ||
0c1bc5c6 | 3174 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3175 | return -ECONNREFUSED; |
742e519b | 3176 | |
f2fcfcd6 | 3177 | break; |
f2fcfcd6 GP |
3178 | } |
3179 | ||
3180 | done: | |
0c1bc5c6 | 3181 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3182 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3183 | rfc.mode = chan->mode; |
f2fcfcd6 | 3184 | |
73ffa904 | 3185 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3186 | return -ECONNREFUSED; |
3187 | ||
2d792818 GP |
3188 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3189 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3190 | } |
3191 | ||
5dee9e7c MH |
3192 | if (result == L2CAP_CONF_SUCCESS) { |
3193 | /* Configure output options and let the other side know | |
3194 | * which ones we don't like. */ | |
3195 | ||
f2fcfcd6 GP |
3196 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3197 | result = L2CAP_CONF_UNACCEPT; | |
3198 | else { | |
0c1bc5c6 | 3199 | chan->omtu = mtu; |
c1360a1c | 3200 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3201 | } |
0c1bc5c6 | 3202 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3203 | |
42dceae2 AE |
3204 | if (remote_efs) { |
3205 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3206 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3207 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3208 | |
3209 | result = L2CAP_CONF_UNACCEPT; | |
3210 | ||
3211 | if (chan->num_conf_req >= 1) | |
3212 | return -ECONNREFUSED; | |
3213 | ||
3214 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3215 | sizeof(efs), |
3216 | (unsigned long) &efs); | |
0e8b207e | 3217 | } else { |
3e6b3b95 | 3218 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3219 | result = L2CAP_CONF_PENDING; |
3220 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3221 | } |
3222 | } | |
3223 | ||
f2fcfcd6 GP |
3224 | switch (rfc.mode) { |
3225 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3226 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3227 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3228 | break; |
3229 | ||
3230 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3231 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3232 | chan->remote_tx_win = rfc.txwin_size; | |
3233 | else | |
3234 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3235 | |
2c03a7a4 | 3236 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3237 | |
c8f79162 | 3238 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3239 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3240 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3241 | rfc.max_pdu_size = cpu_to_le16(size); |
3242 | chan->remote_mps = size; | |
f2fcfcd6 | 3243 | |
10467e9e | 3244 | rfc.retrans_timeout = |
4fd21a88 | 3245 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 3246 | rfc.monitor_timeout = |
4fd21a88 | 3247 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 3248 | |
c1360a1c | 3249 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3250 | |
3251 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3252 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3253 | |
42dceae2 AE |
3254 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3255 | chan->remote_id = efs.id; | |
3256 | chan->remote_stype = efs.stype; | |
3257 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3258 | chan->remote_flush_to = | |
2d792818 | 3259 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3260 | chan->remote_acc_lat = |
2d792818 | 3261 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3262 | chan->remote_sdu_itime = |
3263 | le32_to_cpu(efs.sdu_itime); | |
3264 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3265 | sizeof(efs), |
3266 | (unsigned long) &efs); | |
42dceae2 | 3267 | } |
f2fcfcd6 GP |
3268 | break; |
3269 | ||
3270 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3271 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3272 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3273 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3274 | rfc.max_pdu_size = cpu_to_le16(size); |
3275 | chan->remote_mps = size; | |
f2fcfcd6 | 3276 | |
c1360a1c | 3277 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3278 | |
2d792818 GP |
3279 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3280 | (unsigned long) &rfc); | |
68ae6639 | 3281 | |
f2fcfcd6 GP |
3282 | break; |
3283 | ||
3284 | default: | |
5dee9e7c | 3285 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3286 | |
6464f35f | 3287 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3288 | rfc.mode = chan->mode; |
f2fcfcd6 | 3289 | } |
6464f35f | 3290 | |
f2fcfcd6 | 3291 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3292 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3293 | } |
fe4128e0 | 3294 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3295 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3296 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3297 | |
3298 | return ptr - data; | |
1da177e4 LT |
3299 | } |
3300 | ||
2d792818 GP |
3301 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3302 | void *data, u16 *result) | |
f2fcfcd6 | 3303 | { |
f2fcfcd6 GP |
3304 | struct l2cap_conf_req *req = data; |
3305 | void *ptr = req->data; | |
3306 | int type, olen; | |
3307 | unsigned long val; | |
36e999a8 | 3308 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3309 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3310 | |
fe4128e0 | 3311 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3312 | |
3313 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3314 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3315 | ||
3316 | switch (type) { | |
3317 | case L2CAP_CONF_MTU: | |
3318 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3319 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3320 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3321 | } else |
0c1bc5c6 GP |
3322 | chan->imtu = val; |
3323 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3324 | break; |
3325 | ||
3326 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3327 | chan->flush_to = val; |
f2fcfcd6 | 3328 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3329 | 2, chan->flush_to); |
f2fcfcd6 GP |
3330 | break; |
3331 | ||
3332 | case L2CAP_CONF_RFC: | |
3333 | if (olen == sizeof(rfc)) | |
3334 | memcpy(&rfc, (void *)val, olen); | |
3335 | ||
c1360a1c | 3336 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3337 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3338 | return -ECONNREFUSED; |
3339 | ||
47d1ec61 | 3340 | chan->fcs = 0; |
f2fcfcd6 GP |
3341 | |
3342 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3343 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3344 | break; |
6327eb98 AE |
3345 | |
3346 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3347 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3348 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3349 | chan->tx_win); |
6327eb98 | 3350 | break; |
66af7aaf AE |
3351 | |
3352 | case L2CAP_CONF_EFS: | |
3353 | if (olen == sizeof(efs)) | |
3354 | memcpy(&efs, (void *)val, olen); | |
3355 | ||
3356 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3357 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3358 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3359 | return -ECONNREFUSED; |
3360 | ||
2d792818 GP |
3361 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3362 | (unsigned long) &efs); | |
66af7aaf | 3363 | break; |
f2fcfcd6 GP |
3364 | } |
3365 | } | |
3366 | ||
0c1bc5c6 | 3367 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3368 | return -ECONNREFUSED; |
3369 | ||
0c1bc5c6 | 3370 | chan->mode = rfc.mode; |
6c2ea7a8 | 3371 | |
0e8b207e | 3372 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3373 | switch (rfc.mode) { |
3374 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3375 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3376 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3377 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3378 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3379 | chan->ack_win = min_t(u16, chan->ack_win, | |
3380 | rfc.txwin_size); | |
66af7aaf AE |
3381 | |
3382 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3383 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3384 | chan->local_sdu_itime = | |
2d792818 | 3385 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3386 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3387 | chan->local_flush_to = | |
2d792818 | 3388 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3389 | } |
f2fcfcd6 | 3390 | break; |
66af7aaf | 3391 | |
f2fcfcd6 | 3392 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3393 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3394 | } |
3395 | } | |
3396 | ||
fe4128e0 | 3397 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3398 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3399 | |
3400 | return ptr - data; | |
3401 | } | |
3402 | ||
2d792818 GP |
3403 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3404 | u16 result, u16 flags) | |
1da177e4 LT |
3405 | { |
3406 | struct l2cap_conf_rsp *rsp = data; | |
3407 | void *ptr = rsp->data; | |
1da177e4 | 3408 | |
fe4128e0 | 3409 | BT_DBG("chan %p", chan); |
1da177e4 | 3410 | |
fe4128e0 | 3411 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3412 | rsp->result = cpu_to_le16(result); |
aca3192c | 3413 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3414 | |
3415 | return ptr - data; | |
3416 | } | |
3417 | ||
8c1d787b | 3418 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3419 | { |
3420 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3421 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
3422 | u8 buf[128]; |
3423 | ||
fe4128e0 GP |
3424 | rsp.scid = cpu_to_le16(chan->dcid); |
3425 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3426 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3427 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
2d792818 | 3428 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
710f9b0a | 3429 | |
c1360a1c | 3430 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3431 | return; |
3432 | ||
710f9b0a | 3433 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3434 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3435 | chan->num_conf_req++; |
3436 | } | |
3437 | ||
47d1ec61 | 3438 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3439 | { |
7b1c0049 GP |
3440 | int type, olen; |
3441 | unsigned long val; | |
c20f8e35 MM |
3442 | /* Use sane default values in case a misbehaving remote device |
3443 | * did not send an RFC or extended window size option. | |
3444 | */ | |
3445 | u16 txwin_ext = chan->ack_win; | |
3446 | struct l2cap_conf_rfc rfc = { | |
3447 | .mode = chan->mode, | |
3448 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3449 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3450 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3451 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3452 | }; | |
7b1c0049 | 3453 | |
47d1ec61 | 3454 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3455 | |
0c1bc5c6 | 3456 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3457 | return; |
3458 | ||
3459 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3460 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3461 | ||
c20f8e35 MM |
3462 | switch (type) { |
3463 | case L2CAP_CONF_RFC: | |
3464 | if (olen == sizeof(rfc)) | |
3465 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3466 | break; |
c20f8e35 MM |
3467 | case L2CAP_CONF_EWS: |
3468 | txwin_ext = val; | |
3469 | break; | |
3470 | } | |
7b1c0049 GP |
3471 | } |
3472 | ||
7b1c0049 GP |
3473 | switch (rfc.mode) { |
3474 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3475 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3476 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3477 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3478 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3479 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3480 | else | |
3481 | chan->ack_win = min_t(u16, chan->ack_win, | |
3482 | rfc.txwin_size); | |
7b1c0049 GP |
3483 | break; |
3484 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3485 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3486 | } |
3487 | } | |
3488 | ||
2d792818 GP |
3489 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
3490 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
4e8402a3 | 3491 | { |
e2fd318e | 3492 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3493 | |
e2fd318e | 3494 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3495 | return 0; |
3496 | ||
3497 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3498 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3499 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3500 | |
3501 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3502 | conn->info_ident = 0; |
984947dc | 3503 | |
4e8402a3 MH |
3504 | l2cap_conn_start(conn); |
3505 | } | |
3506 | ||
3507 | return 0; | |
3508 | } | |
3509 | ||
1700915f MM |
3510 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3511 | struct l2cap_cmd_hdr *cmd, | |
3512 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3513 | { |
1da177e4 LT |
3514 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3515 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3516 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 3517 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 3518 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3519 | |
3520 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3521 | __le16 psm = req->psm; |
1da177e4 | 3522 | |
097db76c | 3523 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3524 | |
3525 | /* Check if we have socket listening on psm */ | |
c2287681 | 3526 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 3527 | if (!pchan) { |
1da177e4 LT |
3528 | result = L2CAP_CR_BAD_PSM; |
3529 | goto sendresp; | |
3530 | } | |
3531 | ||
23691d75 GP |
3532 | parent = pchan->sk; |
3533 | ||
3df91ea2 | 3534 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 3535 | lock_sock(parent); |
e0f0cb56 | 3536 | |
e7c29cb1 | 3537 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3538 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3539 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3540 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3541 | result = L2CAP_CR_SEC_BLOCK; |
3542 | goto response; | |
3543 | } | |
3544 | ||
1da177e4 LT |
3545 | result = L2CAP_CR_NO_MEM; |
3546 | ||
2dfa1003 GP |
3547 | /* Check if we already have channel with that dcid */ |
3548 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3549 | goto response; | |
3550 | ||
80b98027 | 3551 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3552 | if (!chan) |
1da177e4 LT |
3553 | goto response; |
3554 | ||
80808e43 GP |
3555 | sk = chan->sk; |
3556 | ||
1da177e4 LT |
3557 | hci_conn_hold(conn->hcon); |
3558 | ||
1da177e4 LT |
3559 | bacpy(&bt_sk(sk)->src, conn->src); |
3560 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3561 | chan->psm = psm; |
3562 | chan->dcid = scid; | |
1700915f | 3563 | chan->local_amp_id = amp_id; |
1da177e4 | 3564 | |
6be36555 | 3565 | __l2cap_chan_add(conn, chan); |
48454079 | 3566 | |
fe4128e0 | 3567 | dcid = chan->scid; |
1da177e4 | 3568 | |
c9b66675 | 3569 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3570 | |
fc7f8a7e | 3571 | chan->ident = cmd->ident; |
1da177e4 | 3572 | |
984947dc | 3573 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3574 | if (l2cap_chan_check_security(chan)) { |
c5daa683 | 3575 | if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { |
0e587be7 | 3576 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3577 | result = L2CAP_CR_PEND; |
3578 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3579 | chan->ops->defer(chan); |
f66dc81f | 3580 | } else { |
1700915f MM |
3581 | /* Force pending result for AMP controllers. |
3582 | * The connection will succeed after the | |
3583 | * physical link is up. | |
3584 | */ | |
3585 | if (amp_id) { | |
3586 | __l2cap_state_change(chan, BT_CONNECT2); | |
3587 | result = L2CAP_CR_PEND; | |
3588 | } else { | |
3589 | __l2cap_state_change(chan, BT_CONFIG); | |
3590 | result = L2CAP_CR_SUCCESS; | |
3591 | } | |
f66dc81f MH |
3592 | status = L2CAP_CS_NO_INFO; |
3593 | } | |
79d554a6 | 3594 | } else { |
0e587be7 | 3595 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3596 | result = L2CAP_CR_PEND; |
3597 | status = L2CAP_CS_AUTHEN_PEND; | |
3598 | } | |
3599 | } else { | |
0e587be7 | 3600 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3601 | result = L2CAP_CR_PEND; |
3602 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3603 | } |
3604 | ||
1da177e4 | 3605 | response: |
aa2ac881 | 3606 | release_sock(parent); |
3df91ea2 | 3607 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3608 | |
3609 | sendresp: | |
aca3192c YH |
3610 | rsp.scid = cpu_to_le16(scid); |
3611 | rsp.dcid = cpu_to_le16(dcid); | |
3612 | rsp.result = cpu_to_le16(result); | |
3613 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3614 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3615 | |
3616 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3617 | struct l2cap_info_req info; | |
ac73498c | 3618 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3619 | |
3620 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3621 | conn->info_ident = l2cap_get_ident(conn); | |
3622 | ||
ba13ccd9 | 3623 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3624 | |
2d792818 GP |
3625 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3626 | sizeof(info), &info); | |
79d554a6 MH |
3627 | } |
3628 | ||
c1360a1c | 3629 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3630 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3631 | u8 buf[128]; |
c1360a1c | 3632 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3633 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3634 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3635 | chan->num_conf_req++; |
e9aeb2dd | 3636 | } |
1700915f MM |
3637 | |
3638 | return chan; | |
4c89b6aa | 3639 | } |
e9aeb2dd | 3640 | |
4c89b6aa MM |
3641 | static int l2cap_connect_req(struct l2cap_conn *conn, |
3642 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3643 | { | |
300229f9 | 3644 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3645 | return 0; |
3646 | } | |
3647 | ||
5909cf30 | 3648 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
2d792818 | 3649 | struct l2cap_cmd_hdr *cmd, u8 *data) |
1da177e4 LT |
3650 | { |
3651 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3652 | u16 scid, dcid, result, status; | |
48454079 | 3653 | struct l2cap_chan *chan; |
1da177e4 | 3654 | u8 req[128]; |
3df91ea2 | 3655 | int err; |
1da177e4 LT |
3656 | |
3657 | scid = __le16_to_cpu(rsp->scid); | |
3658 | dcid = __le16_to_cpu(rsp->dcid); | |
3659 | result = __le16_to_cpu(rsp->result); | |
3660 | status = __le16_to_cpu(rsp->status); | |
3661 | ||
1b009c98 | 3662 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3663 | dcid, scid, result, status); |
1da177e4 | 3664 | |
3df91ea2 AE |
3665 | mutex_lock(&conn->chan_lock); |
3666 | ||
1da177e4 | 3667 | if (scid) { |
3df91ea2 AE |
3668 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3669 | if (!chan) { | |
3670 | err = -EFAULT; | |
3671 | goto unlock; | |
3672 | } | |
1da177e4 | 3673 | } else { |
3df91ea2 AE |
3674 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3675 | if (!chan) { | |
3676 | err = -EFAULT; | |
3677 | goto unlock; | |
3678 | } | |
1da177e4 LT |
3679 | } |
3680 | ||
3df91ea2 AE |
3681 | err = 0; |
3682 | ||
6be36555 | 3683 | l2cap_chan_lock(chan); |
48454079 | 3684 | |
1da177e4 LT |
3685 | switch (result) { |
3686 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3687 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3688 | chan->ident = 0; |
fe4128e0 | 3689 | chan->dcid = dcid; |
c1360a1c | 3690 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3691 | |
c1360a1c | 3692 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3693 | break; |
3694 | ||
1da177e4 | 3695 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3696 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3697 | chan->num_conf_req++; |
1da177e4 LT |
3698 | break; |
3699 | ||
3700 | case L2CAP_CR_PEND: | |
c1360a1c | 3701 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3702 | break; |
3703 | ||
3704 | default: | |
48454079 | 3705 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3706 | break; |
3707 | } | |
3708 | ||
6be36555 | 3709 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3710 | |
3711 | unlock: | |
3712 | mutex_unlock(&conn->chan_lock); | |
3713 | ||
3714 | return err; | |
1da177e4 LT |
3715 | } |
3716 | ||
47d1ec61 | 3717 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3718 | { |
3719 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3720 | * sides request it. | |
3721 | */ | |
0c1bc5c6 | 3722 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3723 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3724 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3725 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3726 | } |
3727 | ||
29d8a590 AE |
3728 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3729 | u8 ident, u16 flags) | |
3730 | { | |
3731 | struct l2cap_conn *conn = chan->conn; | |
3732 | ||
3733 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3734 | flags); | |
3735 | ||
3736 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3737 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3738 | ||
3739 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3740 | l2cap_build_conf_rsp(chan, data, | |
3741 | L2CAP_CONF_SUCCESS, flags), data); | |
3742 | } | |
3743 | ||
2d792818 GP |
3744 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3745 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3746 | u8 *data) | |
1da177e4 LT |
3747 | { |
3748 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3749 | u16 dcid, flags; | |
3750 | u8 rsp[64]; | |
48454079 | 3751 | struct l2cap_chan *chan; |
3c588192 | 3752 | int len, err = 0; |
1da177e4 LT |
3753 | |
3754 | dcid = __le16_to_cpu(req->dcid); | |
3755 | flags = __le16_to_cpu(req->flags); | |
3756 | ||
3757 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3758 | ||
baa7e1fa | 3759 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3760 | if (!chan) |
1da177e4 LT |
3761 | return -ENOENT; |
3762 | ||
033b1142 | 3763 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3764 | struct l2cap_cmd_rej_cid rej; |
3765 | ||
ac73498c | 3766 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); |
e2fd318e IK |
3767 | rej.scid = cpu_to_le16(chan->scid); |
3768 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3769 | |
df6bd743 | 3770 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
2d792818 | 3771 | sizeof(rej), &rej); |
354f60a9 | 3772 | goto unlock; |
df6bd743 | 3773 | } |
354f60a9 | 3774 | |
5dee9e7c | 3775 | /* Reject if config buffer is too small. */ |
88219a0f | 3776 | len = cmd_len - sizeof(*req); |
7ac28817 | 3777 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3778 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
3779 | l2cap_build_conf_rsp(chan, rsp, |
3780 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
3781 | goto unlock; |
3782 | } | |
3783 | ||
3784 | /* Store config. */ | |
73ffa904 GP |
3785 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3786 | chan->conf_len += len; | |
1da177e4 | 3787 | |
59e54bd1 | 3788 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
3789 | /* Incomplete config. Send empty response. */ |
3790 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
3791 | l2cap_build_conf_rsp(chan, rsp, |
3792 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
3793 | goto unlock; |
3794 | } | |
3795 | ||
3796 | /* Complete config. */ | |
73ffa904 | 3797 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3798 | if (len < 0) { |
e92c8e70 | 3799 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3800 | goto unlock; |
f2fcfcd6 | 3801 | } |
1da177e4 | 3802 | |
1500109b | 3803 | chan->ident = cmd->ident; |
5dee9e7c | 3804 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3805 | chan->num_conf_rsp++; |
5dee9e7c | 3806 | |
5dee9e7c | 3807 | /* Reset config buffer. */ |
73ffa904 | 3808 | chan->conf_len = 0; |
5dee9e7c | 3809 | |
c1360a1c | 3810 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3811 | goto unlock; |
3812 | ||
c1360a1c | 3813 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3814 | set_default_fcs(chan); |
fcc203c3 | 3815 | |
105bdf9e MM |
3816 | if (chan->mode == L2CAP_MODE_ERTM || |
3817 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3818 | err = l2cap_ertm_init(chan); |
3819 | ||
3820 | if (err < 0) | |
3821 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3822 | else | |
3823 | l2cap_chan_ready(chan); | |
0565c1c2 | 3824 | |
876d9484 MH |
3825 | goto unlock; |
3826 | } | |
3827 | ||
c1360a1c | 3828 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3829 | u8 buf[64]; |
1da177e4 | 3830 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3831 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3832 | chan->num_conf_req++; |
1da177e4 LT |
3833 | } |
3834 | ||
0e8b207e AE |
3835 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3836 | Conf Rsp PENDING in the code above */ | |
3837 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 3838 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
3839 | |
3840 | /* check compatibility */ | |
3841 | ||
79de886d AE |
3842 | /* Send rsp for BR/EDR channel */ |
3843 | if (!chan->ctrl_id) | |
3844 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); | |
3845 | else | |
3846 | chan->ident = cmd->ident; | |
0e8b207e AE |
3847 | } |
3848 | ||
1da177e4 | 3849 | unlock: |
6be36555 | 3850 | l2cap_chan_unlock(chan); |
3c588192 | 3851 | return err; |
1da177e4 LT |
3852 | } |
3853 | ||
2d792818 GP |
3854 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
3855 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3856 | { |
3857 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3858 | u16 scid, flags, result; | |
48454079 | 3859 | struct l2cap_chan *chan; |
61386cba | 3860 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3861 | int err = 0; |
1da177e4 LT |
3862 | |
3863 | scid = __le16_to_cpu(rsp->scid); | |
3864 | flags = __le16_to_cpu(rsp->flags); | |
3865 | result = __le16_to_cpu(rsp->result); | |
3866 | ||
61386cba AE |
3867 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3868 | result, len); | |
1da177e4 | 3869 | |
baa7e1fa | 3870 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3871 | if (!chan) |
1da177e4 LT |
3872 | return 0; |
3873 | ||
3874 | switch (result) { | |
3875 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3876 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3877 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3878 | break; |
3879 | ||
0e8b207e AE |
3880 | case L2CAP_CONF_PENDING: |
3881 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3882 | ||
3883 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3884 | char buf[64]; | |
3885 | ||
3886 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 3887 | buf, &result); |
0e8b207e AE |
3888 | if (len < 0) { |
3889 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3890 | goto done; | |
3891 | } | |
3892 | ||
3893 | /* check compatibility */ | |
3894 | ||
79de886d AE |
3895 | if (!chan->ctrl_id) |
3896 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, | |
3897 | 0); | |
3898 | else | |
3899 | chan->ident = cmd->ident; | |
0e8b207e AE |
3900 | } |
3901 | goto done; | |
3902 | ||
1da177e4 | 3903 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3904 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3905 | char req[64]; |
3906 | ||
c2c77ec8 | 3907 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3908 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3909 | goto done; |
3910 | } | |
3911 | ||
f2fcfcd6 GP |
3912 | /* throw out any old stored conf requests */ |
3913 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 3914 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 3915 | req, &result); |
f2fcfcd6 | 3916 | if (len < 0) { |
e92c8e70 | 3917 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3918 | goto done; |
3919 | } | |
3920 | ||
3921 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 3922 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 3923 | chan->num_conf_req++; |
f2fcfcd6 GP |
3924 | if (result != L2CAP_CONF_SUCCESS) |
3925 | goto done; | |
3926 | break; | |
1da177e4 LT |
3927 | } |
3928 | ||
8e87d142 | 3929 | default: |
6be36555 | 3930 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3931 | |
ba13ccd9 | 3932 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3933 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3934 | goto done; |
3935 | } | |
3936 | ||
59e54bd1 | 3937 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
3938 | goto done; |
3939 | ||
c1360a1c | 3940 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3941 | |
c1360a1c | 3942 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3943 | set_default_fcs(chan); |
fcc203c3 | 3944 | |
105bdf9e MM |
3945 | if (chan->mode == L2CAP_MODE_ERTM || |
3946 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3947 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3948 | |
3c588192 MM |
3949 | if (err < 0) |
3950 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3951 | else | |
3952 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3953 | } |
3954 | ||
3955 | done: | |
6be36555 | 3956 | l2cap_chan_unlock(chan); |
3c588192 | 3957 | return err; |
1da177e4 LT |
3958 | } |
3959 | ||
2d792818 GP |
3960 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
3961 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
3962 | { |
3963 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3964 | struct l2cap_disconn_rsp rsp; | |
3965 | u16 dcid, scid; | |
48454079 | 3966 | struct l2cap_chan *chan; |
1da177e4 LT |
3967 | struct sock *sk; |
3968 | ||
3969 | scid = __le16_to_cpu(req->scid); | |
3970 | dcid = __le16_to_cpu(req->dcid); | |
3971 | ||
3972 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3973 | ||
3df91ea2 AE |
3974 | mutex_lock(&conn->chan_lock); |
3975 | ||
3976 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3977 | if (!chan) { | |
3978 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3979 | return 0; |
3df91ea2 | 3980 | } |
1da177e4 | 3981 | |
6be36555 AE |
3982 | l2cap_chan_lock(chan); |
3983 | ||
48454079 GP |
3984 | sk = chan->sk; |
3985 | ||
fe4128e0 GP |
3986 | rsp.dcid = cpu_to_le16(chan->scid); |
3987 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3988 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3989 | ||
6be36555 | 3990 | lock_sock(sk); |
1da177e4 | 3991 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3992 | release_sock(sk); |
1da177e4 | 3993 | |
61d6ef3e | 3994 | l2cap_chan_hold(chan); |
48454079 | 3995 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3996 | |
3997 | l2cap_chan_unlock(chan); | |
1da177e4 | 3998 | |
80b98027 | 3999 | chan->ops->close(chan); |
61d6ef3e | 4000 | l2cap_chan_put(chan); |
3df91ea2 AE |
4001 | |
4002 | mutex_unlock(&conn->chan_lock); | |
4003 | ||
1da177e4 LT |
4004 | return 0; |
4005 | } | |
4006 | ||
2d792818 GP |
4007 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
4008 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
4009 | { |
4010 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4011 | u16 dcid, scid; | |
48454079 | 4012 | struct l2cap_chan *chan; |
1da177e4 LT |
4013 | |
4014 | scid = __le16_to_cpu(rsp->scid); | |
4015 | dcid = __le16_to_cpu(rsp->dcid); | |
4016 | ||
4017 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4018 | ||
3df91ea2 AE |
4019 | mutex_lock(&conn->chan_lock); |
4020 | ||
4021 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4022 | if (!chan) { | |
4023 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4024 | return 0; |
3df91ea2 | 4025 | } |
1da177e4 | 4026 | |
6be36555 | 4027 | l2cap_chan_lock(chan); |
48454079 | 4028 | |
61d6ef3e | 4029 | l2cap_chan_hold(chan); |
48454079 | 4030 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4031 | |
4032 | l2cap_chan_unlock(chan); | |
1da177e4 | 4033 | |
80b98027 | 4034 | chan->ops->close(chan); |
61d6ef3e | 4035 | l2cap_chan_put(chan); |
3df91ea2 AE |
4036 | |
4037 | mutex_unlock(&conn->chan_lock); | |
4038 | ||
1da177e4 LT |
4039 | return 0; |
4040 | } | |
4041 | ||
2d792818 GP |
4042 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
4043 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
4044 | { |
4045 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4046 | u16 type; |
4047 | ||
4048 | type = __le16_to_cpu(req->type); | |
4049 | ||
4050 | BT_DBG("type 0x%4.4x", type); | |
4051 | ||
f0709e03 MH |
4052 | if (type == L2CAP_IT_FEAT_MASK) { |
4053 | u8 buf[8]; | |
44dd46de | 4054 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4055 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
4056 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4057 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4058 | if (!disable_ertm) |
fcc203c3 | 4059 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4060 | | L2CAP_FEAT_FCS; |
a5fd6f30 | 4061 | if (enable_hs) |
6327eb98 | 4062 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4063 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4064 | |
1b7bf4ed | 4065 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4066 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4067 | buf); | |
e1027a7c MH |
4068 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4069 | u8 buf[12]; | |
4070 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
4071 | |
4072 | if (enable_hs) | |
4073 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
4074 | else | |
4075 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4076 | ||
ac73498c AE |
4077 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4078 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4079 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4080 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4081 | buf); | |
f0709e03 MH |
4082 | } else { |
4083 | struct l2cap_info_rsp rsp; | |
4084 | rsp.type = cpu_to_le16(type); | |
ac73498c | 4085 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4086 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4087 | &rsp); | |
f0709e03 | 4088 | } |
1da177e4 LT |
4089 | |
4090 | return 0; | |
4091 | } | |
4092 | ||
2d792818 GP |
4093 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
4094 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
1da177e4 LT |
4095 | { |
4096 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4097 | u16 type, result; | |
4098 | ||
4099 | type = __le16_to_cpu(rsp->type); | |
4100 | result = __le16_to_cpu(rsp->result); | |
4101 | ||
4102 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4103 | ||
e90165be AE |
4104 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4105 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4106 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4107 | return 0; |
4108 | ||
17cd3f37 | 4109 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4110 | |
adb08ede VT |
4111 | if (result != L2CAP_IR_SUCCESS) { |
4112 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4113 | conn->info_ident = 0; | |
4114 | ||
4115 | l2cap_conn_start(conn); | |
4116 | ||
4117 | return 0; | |
4118 | } | |
4119 | ||
978c93b9 AE |
4120 | switch (type) { |
4121 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4122 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4123 | |
47ec1dcd | 4124 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4125 | struct l2cap_info_req req; |
ac73498c | 4126 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4127 | |
4128 | conn->info_ident = l2cap_get_ident(conn); | |
4129 | ||
4130 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4131 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4132 | } else { |
4133 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4134 | conn->info_ident = 0; | |
4135 | ||
4136 | l2cap_conn_start(conn); | |
4137 | } | |
978c93b9 AE |
4138 | break; |
4139 | ||
4140 | case L2CAP_IT_FIXED_CHAN: | |
4141 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4142 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4143 | conn->info_ident = 0; |
984947dc MH |
4144 | |
4145 | l2cap_conn_start(conn); | |
978c93b9 | 4146 | break; |
984947dc | 4147 | } |
4e8402a3 | 4148 | |
1da177e4 LT |
4149 | return 0; |
4150 | } | |
4151 | ||
1700915f MM |
4152 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4153 | struct l2cap_cmd_hdr *cmd, | |
4154 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4155 | { |
4156 | struct l2cap_create_chan_req *req = data; | |
1700915f | 4157 | struct l2cap_chan *chan; |
f94ff6ff MM |
4158 | u16 psm, scid; |
4159 | ||
4160 | if (cmd_len != sizeof(*req)) | |
4161 | return -EPROTO; | |
4162 | ||
4163 | if (!enable_hs) | |
4164 | return -EINVAL; | |
4165 | ||
4166 | psm = le16_to_cpu(req->psm); | |
4167 | scid = le16_to_cpu(req->scid); | |
4168 | ||
ad0ac6ca | 4169 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4170 | |
1700915f MM |
4171 | if (req->amp_id) { |
4172 | struct hci_dev *hdev; | |
4173 | ||
4174 | /* Validate AMP controller id */ | |
4175 | hdev = hci_dev_get(req->amp_id); | |
4176 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4177 | !test_bit(HCI_UP, &hdev->flags)) { | |
4178 | struct l2cap_create_chan_rsp rsp; | |
4179 | ||
4180 | rsp.dcid = 0; | |
4181 | rsp.scid = cpu_to_le16(scid); | |
4182 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); | |
4183 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
4184 | ||
4185 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4186 | sizeof(rsp), &rsp); | |
4187 | ||
4188 | if (hdev) | |
4189 | hci_dev_put(hdev); | |
4190 | ||
4191 | return 0; | |
4192 | } | |
4193 | ||
4194 | hci_dev_put(hdev); | |
4195 | } | |
f94ff6ff | 4196 | |
1700915f MM |
4197 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4198 | req->amp_id); | |
f94ff6ff MM |
4199 | |
4200 | return 0; | |
4201 | } | |
4202 | ||
8eb200bd MM |
4203 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4204 | { | |
4205 | struct l2cap_move_chan_req req; | |
4206 | u8 ident; | |
4207 | ||
4208 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4209 | ||
4210 | ident = l2cap_get_ident(chan->conn); | |
4211 | chan->ident = ident; | |
4212 | ||
4213 | req.icid = cpu_to_le16(chan->scid); | |
4214 | req.dest_amp_id = dest_amp_id; | |
4215 | ||
4216 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4217 | &req); | |
4218 | ||
4219 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4220 | } | |
4221 | ||
1500109b | 4222 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4223 | { |
4224 | struct l2cap_move_chan_rsp rsp; | |
4225 | ||
1500109b | 4226 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4227 | |
1500109b | 4228 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4229 | rsp.result = cpu_to_le16(result); |
4230 | ||
1500109b MM |
4231 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4232 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4233 | } |
4234 | ||
5b155ef9 | 4235 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4236 | { |
4237 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4238 | |
5b155ef9 | 4239 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4240 | |
5b155ef9 | 4241 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4242 | |
5b155ef9 | 4243 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4244 | cfm.result = cpu_to_le16(result); |
4245 | ||
5b155ef9 MM |
4246 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4247 | sizeof(cfm), &cfm); | |
4248 | ||
4249 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4250 | } | |
4251 | ||
4252 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4253 | { | |
4254 | struct l2cap_move_chan_cfm cfm; | |
4255 | ||
4256 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4257 | ||
4258 | cfm.icid = cpu_to_le16(icid); | |
4259 | cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); | |
4260 | ||
4261 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4262 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4263 | } |
4264 | ||
4265 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4266 | u16 icid) |
8d5a04a1 MM |
4267 | { |
4268 | struct l2cap_move_chan_cfm_rsp rsp; | |
4269 | ||
ad0ac6ca | 4270 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4271 | |
4272 | rsp.icid = cpu_to_le16(icid); | |
4273 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4274 | } | |
4275 | ||
5f3847a4 MM |
4276 | static void __release_logical_link(struct l2cap_chan *chan) |
4277 | { | |
4278 | chan->hs_hchan = NULL; | |
4279 | chan->hs_hcon = NULL; | |
4280 | ||
4281 | /* Placeholder - release the logical link */ | |
4282 | } | |
4283 | ||
1500109b MM |
4284 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4285 | { | |
4286 | /* Logical link setup failed */ | |
4287 | if (chan->state != BT_CONNECTED) { | |
4288 | /* Create channel failure, disconnect */ | |
4289 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4290 | return; | |
4291 | } | |
4292 | ||
4293 | switch (chan->move_role) { | |
4294 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4295 | l2cap_move_done(chan); | |
4296 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4297 | break; | |
4298 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4299 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4300 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4301 | /* Remote has only sent pending or | |
4302 | * success responses, clean up | |
4303 | */ | |
4304 | l2cap_move_done(chan); | |
4305 | } | |
4306 | ||
4307 | /* Other amp move states imply that the move | |
4308 | * has already aborted | |
4309 | */ | |
4310 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4311 | break; | |
4312 | } | |
4313 | } | |
4314 | ||
4315 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4316 | struct hci_chan *hchan) | |
4317 | { | |
4318 | struct l2cap_conf_rsp rsp; | |
4319 | u8 code; | |
4320 | ||
4321 | chan->hs_hcon = hchan->conn; | |
4322 | chan->hs_hcon->l2cap_data = chan->conn; | |
4323 | ||
4324 | code = l2cap_build_conf_rsp(chan, &rsp, | |
4325 | L2CAP_CONF_SUCCESS, 0); | |
4326 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CONF_RSP, code, | |
4327 | &rsp); | |
4328 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
4329 | ||
4330 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
4331 | int err = 0; | |
4332 | ||
4333 | set_default_fcs(chan); | |
4334 | ||
4335 | err = l2cap_ertm_init(chan); | |
4336 | if (err < 0) | |
4337 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4338 | else | |
4339 | l2cap_chan_ready(chan); | |
4340 | } | |
4341 | } | |
4342 | ||
4343 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4344 | struct hci_chan *hchan) | |
4345 | { | |
4346 | chan->hs_hcon = hchan->conn; | |
4347 | chan->hs_hcon->l2cap_data = chan->conn; | |
4348 | ||
4349 | BT_DBG("move_state %d", chan->move_state); | |
4350 | ||
4351 | switch (chan->move_state) { | |
4352 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4353 | /* Move confirm will be sent after a success | |
4354 | * response is received | |
4355 | */ | |
4356 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4357 | break; | |
4358 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4359 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4360 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4361 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4362 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4363 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4364 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4365 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4366 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4367 | } | |
4368 | break; | |
4369 | default: | |
4370 | /* Move was not in expected state, free the channel */ | |
4371 | __release_logical_link(chan); | |
4372 | ||
4373 | chan->move_state = L2CAP_MOVE_STABLE; | |
4374 | } | |
4375 | } | |
4376 | ||
4377 | /* Call with chan locked */ | |
5b155ef9 MM |
4378 | static void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4379 | u8 status) | |
4380 | { | |
1500109b MM |
4381 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4382 | ||
4383 | if (status) { | |
4384 | l2cap_logical_fail(chan); | |
4385 | __release_logical_link(chan); | |
4386 | return; | |
4387 | } | |
4388 | ||
4389 | if (chan->state != BT_CONNECTED) { | |
4390 | /* Ignore logical link if channel is on BR/EDR */ | |
4391 | if (chan->local_amp_id) | |
4392 | l2cap_logical_finish_create(chan, hchan); | |
4393 | } else { | |
4394 | l2cap_logical_finish_move(chan, hchan); | |
4395 | } | |
5b155ef9 MM |
4396 | } |
4397 | ||
8eb200bd MM |
4398 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4399 | u8 local_amp_id, u8 remote_amp_id) | |
4400 | { | |
4401 | if (!test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { | |
4402 | struct l2cap_conn_rsp rsp; | |
4403 | char buf[128]; | |
4404 | rsp.scid = cpu_to_le16(chan->dcid); | |
4405 | rsp.dcid = cpu_to_le16(chan->scid); | |
4406 | ||
4407 | /* Incoming channel on AMP */ | |
4408 | if (result == L2CAP_CR_SUCCESS) { | |
4409 | /* Send successful response */ | |
4410 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
4411 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
4412 | } else { | |
4413 | /* Send negative response */ | |
4414 | rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); | |
4415 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
4416 | } | |
4417 | ||
4418 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4419 | sizeof(rsp), &rsp); | |
4420 | ||
4421 | if (result == L2CAP_CR_SUCCESS) { | |
4422 | __l2cap_state_change(chan, BT_CONFIG); | |
4423 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
4424 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4425 | L2CAP_CONF_REQ, | |
4426 | l2cap_build_conf_req(chan, buf), buf); | |
4427 | chan->num_conf_req++; | |
4428 | } | |
4429 | } else { | |
4430 | /* Outgoing channel on AMP */ | |
4431 | if (result == L2CAP_CR_SUCCESS) { | |
4432 | chan->local_amp_id = local_amp_id; | |
4433 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4434 | } else { | |
4435 | /* Revert to BR/EDR connect */ | |
4436 | l2cap_send_conn_req(chan); | |
4437 | } | |
4438 | } | |
4439 | } | |
4440 | ||
4441 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4442 | u8 remote_amp_id) | |
4443 | { | |
4444 | l2cap_move_setup(chan); | |
4445 | chan->move_id = local_amp_id; | |
4446 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4447 | ||
4448 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4449 | } | |
4450 | ||
4451 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4452 | { | |
4453 | struct hci_chan *hchan = NULL; | |
4454 | ||
4455 | /* Placeholder - get hci_chan for logical link */ | |
4456 | ||
4457 | if (hchan) { | |
4458 | if (hchan->state == BT_CONNECTED) { | |
4459 | /* Logical link is ready to go */ | |
4460 | chan->hs_hcon = hchan->conn; | |
4461 | chan->hs_hcon->l2cap_data = chan->conn; | |
4462 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4463 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4464 | ||
4465 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4466 | } else { | |
4467 | /* Wait for logical link to be ready */ | |
4468 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4469 | } | |
4470 | } else { | |
4471 | /* Logical link not available */ | |
4472 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4473 | } | |
4474 | } | |
4475 | ||
4476 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4477 | { | |
4478 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4479 | u8 rsp_result; | |
4480 | if (result == -EINVAL) | |
4481 | rsp_result = L2CAP_MR_BAD_ID; | |
4482 | else | |
4483 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4484 | ||
4485 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4486 | } | |
4487 | ||
4488 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4489 | chan->move_state = L2CAP_MOVE_STABLE; | |
4490 | ||
4491 | /* Restart data transmission */ | |
4492 | l2cap_ertm_send(chan); | |
4493 | } | |
4494 | ||
4495 | void l2cap_physical_cfm(struct l2cap_chan *chan, int result, u8 local_amp_id, | |
4496 | u8 remote_amp_id) | |
4497 | { | |
4498 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", | |
4499 | chan, result, local_amp_id, remote_amp_id); | |
4500 | ||
4501 | l2cap_chan_lock(chan); | |
4502 | ||
4503 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { | |
4504 | l2cap_chan_unlock(chan); | |
4505 | return; | |
4506 | } | |
4507 | ||
4508 | if (chan->state != BT_CONNECTED) { | |
4509 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4510 | } else if (result != L2CAP_MR_SUCCESS) { | |
4511 | l2cap_do_move_cancel(chan, result); | |
4512 | } else { | |
4513 | switch (chan->move_role) { | |
4514 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4515 | l2cap_do_move_initiate(chan, local_amp_id, | |
4516 | remote_amp_id); | |
4517 | break; | |
4518 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4519 | l2cap_do_move_respond(chan, result); | |
4520 | break; | |
4521 | default: | |
4522 | l2cap_do_move_cancel(chan, result); | |
4523 | break; | |
4524 | } | |
4525 | } | |
4526 | ||
4527 | l2cap_chan_unlock(chan); | |
4528 | } | |
4529 | ||
8d5a04a1 | 4530 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4531 | struct l2cap_cmd_hdr *cmd, |
4532 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4533 | { |
4534 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4535 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4536 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4537 | u16 icid = 0; |
4538 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4539 | ||
4540 | if (cmd_len != sizeof(*req)) | |
4541 | return -EPROTO; | |
4542 | ||
4543 | icid = le16_to_cpu(req->icid); | |
4544 | ||
ad0ac6ca | 4545 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 MM |
4546 | |
4547 | if (!enable_hs) | |
4548 | return -EINVAL; | |
4549 | ||
02b0fbb9 MM |
4550 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4551 | if (!chan) { | |
1500109b MM |
4552 | rsp.icid = cpu_to_le16(icid); |
4553 | rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); | |
4554 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, | |
4555 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4556 | return 0; |
4557 | } | |
4558 | ||
1500109b MM |
4559 | chan->ident = cmd->ident; |
4560 | ||
02b0fbb9 MM |
4561 | if (chan->scid < L2CAP_CID_DYN_START || |
4562 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4563 | (chan->mode != L2CAP_MODE_ERTM && | |
4564 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4565 | result = L2CAP_MR_NOT_ALLOWED; | |
4566 | goto send_move_response; | |
4567 | } | |
4568 | ||
4569 | if (chan->local_amp_id == req->dest_amp_id) { | |
4570 | result = L2CAP_MR_SAME_ID; | |
4571 | goto send_move_response; | |
4572 | } | |
4573 | ||
4574 | if (req->dest_amp_id) { | |
4575 | struct hci_dev *hdev; | |
4576 | hdev = hci_dev_get(req->dest_amp_id); | |
4577 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4578 | !test_bit(HCI_UP, &hdev->flags)) { | |
4579 | if (hdev) | |
4580 | hci_dev_put(hdev); | |
4581 | ||
4582 | result = L2CAP_MR_BAD_ID; | |
4583 | goto send_move_response; | |
4584 | } | |
4585 | hci_dev_put(hdev); | |
4586 | } | |
4587 | ||
4588 | /* Detect a move collision. Only send a collision response | |
4589 | * if this side has "lost", otherwise proceed with the move. | |
4590 | * The winner has the larger bd_addr. | |
4591 | */ | |
4592 | if ((__chan_is_moving(chan) || | |
4593 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
4594 | bacmp(conn->src, conn->dst) > 0) { | |
4595 | result = L2CAP_MR_COLLISION; | |
4596 | goto send_move_response; | |
4597 | } | |
4598 | ||
02b0fbb9 MM |
4599 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4600 | l2cap_move_setup(chan); | |
4601 | chan->move_id = req->dest_amp_id; | |
4602 | icid = chan->dcid; | |
4603 | ||
4604 | if (!req->dest_amp_id) { | |
4605 | /* Moving to BR/EDR */ | |
4606 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4607 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4608 | result = L2CAP_MR_PEND; | |
4609 | } else { | |
4610 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4611 | result = L2CAP_MR_SUCCESS; | |
4612 | } | |
4613 | } else { | |
4614 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4615 | /* Placeholder - uncomment when amp functions are available */ | |
4616 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4617 | result = L2CAP_MR_PEND; | |
4618 | } | |
4619 | ||
4620 | send_move_response: | |
1500109b | 4621 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4622 | |
02b0fbb9 MM |
4623 | l2cap_chan_unlock(chan); |
4624 | ||
8d5a04a1 MM |
4625 | return 0; |
4626 | } | |
4627 | ||
5b155ef9 MM |
4628 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4629 | { | |
4630 | struct l2cap_chan *chan; | |
4631 | struct hci_chan *hchan = NULL; | |
4632 | ||
4633 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4634 | if (!chan) { | |
4635 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4636 | return; | |
4637 | } | |
4638 | ||
4639 | __clear_chan_timer(chan); | |
4640 | if (result == L2CAP_MR_PEND) | |
4641 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4642 | ||
4643 | switch (chan->move_state) { | |
4644 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4645 | /* Move confirm will be sent when logical link | |
4646 | * is complete. | |
4647 | */ | |
4648 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4649 | break; | |
4650 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4651 | if (result == L2CAP_MR_PEND) { | |
4652 | break; | |
4653 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4654 | &chan->conn_state)) { | |
4655 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4656 | } else { | |
4657 | /* Logical link is up or moving to BR/EDR, | |
4658 | * proceed with move | |
4659 | */ | |
4660 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4661 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4662 | } | |
4663 | break; | |
4664 | case L2CAP_MOVE_WAIT_RSP: | |
4665 | /* Moving to AMP */ | |
4666 | if (result == L2CAP_MR_SUCCESS) { | |
4667 | /* Remote is ready, send confirm immediately | |
4668 | * after logical link is ready | |
4669 | */ | |
4670 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4671 | } else { | |
4672 | /* Both logical link and move success | |
4673 | * are required to confirm | |
4674 | */ | |
4675 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
4676 | } | |
4677 | ||
4678 | /* Placeholder - get hci_chan for logical link */ | |
4679 | if (!hchan) { | |
4680 | /* Logical link not available */ | |
4681 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4682 | break; | |
4683 | } | |
4684 | ||
4685 | /* If the logical link is not yet connected, do not | |
4686 | * send confirmation. | |
4687 | */ | |
4688 | if (hchan->state != BT_CONNECTED) | |
4689 | break; | |
4690 | ||
4691 | /* Logical link is already ready to go */ | |
4692 | ||
4693 | chan->hs_hcon = hchan->conn; | |
4694 | chan->hs_hcon->l2cap_data = chan->conn; | |
4695 | ||
4696 | if (result == L2CAP_MR_SUCCESS) { | |
4697 | /* Can confirm now */ | |
4698 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4699 | } else { | |
4700 | /* Now only need move success | |
4701 | * to confirm | |
4702 | */ | |
4703 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4704 | } | |
4705 | ||
4706 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4707 | break; | |
4708 | default: | |
4709 | /* Any other amp move state means the move failed. */ | |
4710 | chan->move_id = chan->local_amp_id; | |
4711 | l2cap_move_done(chan); | |
4712 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4713 | } | |
4714 | ||
4715 | l2cap_chan_unlock(chan); | |
4716 | } | |
4717 | ||
4718 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
4719 | u16 result) | |
4720 | { | |
4721 | struct l2cap_chan *chan; | |
4722 | ||
4723 | chan = l2cap_get_chan_by_ident(conn, ident); | |
4724 | if (!chan) { | |
4725 | /* Could not locate channel, icid is best guess */ | |
4726 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4727 | return; | |
4728 | } | |
4729 | ||
4730 | __clear_chan_timer(chan); | |
4731 | ||
4732 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4733 | if (result == L2CAP_MR_COLLISION) { | |
4734 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
4735 | } else { | |
4736 | /* Cleanup - cancel move */ | |
4737 | chan->move_id = chan->local_amp_id; | |
4738 | l2cap_move_done(chan); | |
4739 | } | |
4740 | } | |
4741 | ||
4742 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4743 | ||
4744 | l2cap_chan_unlock(chan); | |
4745 | } | |
4746 | ||
4747 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
4748 | struct l2cap_cmd_hdr *cmd, | |
4749 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4750 | { |
4751 | struct l2cap_move_chan_rsp *rsp = data; | |
4752 | u16 icid, result; | |
4753 | ||
4754 | if (cmd_len != sizeof(*rsp)) | |
4755 | return -EPROTO; | |
4756 | ||
4757 | icid = le16_to_cpu(rsp->icid); | |
4758 | result = le16_to_cpu(rsp->result); | |
4759 | ||
ad0ac6ca | 4760 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 4761 | |
5b155ef9 MM |
4762 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
4763 | l2cap_move_continue(conn, icid, result); | |
4764 | else | |
4765 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
4766 | |
4767 | return 0; | |
4768 | } | |
4769 | ||
5f3847a4 MM |
4770 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
4771 | struct l2cap_cmd_hdr *cmd, | |
4772 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4773 | { |
4774 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 4775 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4776 | u16 icid, result; |
4777 | ||
4778 | if (cmd_len != sizeof(*cfm)) | |
4779 | return -EPROTO; | |
4780 | ||
4781 | icid = le16_to_cpu(cfm->icid); | |
4782 | result = le16_to_cpu(cfm->result); | |
4783 | ||
ad0ac6ca | 4784 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 4785 | |
5f3847a4 MM |
4786 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4787 | if (!chan) { | |
4788 | /* Spec requires a response even if the icid was not found */ | |
4789 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
4790 | return 0; | |
4791 | } | |
4792 | ||
4793 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
4794 | if (result == L2CAP_MC_CONFIRMED) { | |
4795 | chan->local_amp_id = chan->move_id; | |
4796 | if (!chan->local_amp_id) | |
4797 | __release_logical_link(chan); | |
4798 | } else { | |
4799 | chan->move_id = chan->local_amp_id; | |
4800 | } | |
4801 | ||
4802 | l2cap_move_done(chan); | |
4803 | } | |
4804 | ||
8d5a04a1 MM |
4805 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
4806 | ||
5f3847a4 MM |
4807 | l2cap_chan_unlock(chan); |
4808 | ||
8d5a04a1 MM |
4809 | return 0; |
4810 | } | |
4811 | ||
4812 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
4813 | struct l2cap_cmd_hdr *cmd, |
4814 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4815 | { |
4816 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 4817 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4818 | u16 icid; |
4819 | ||
4820 | if (cmd_len != sizeof(*rsp)) | |
4821 | return -EPROTO; | |
4822 | ||
4823 | icid = le16_to_cpu(rsp->icid); | |
4824 | ||
ad0ac6ca | 4825 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 4826 | |
3fd71a0a MM |
4827 | chan = l2cap_get_chan_by_scid(conn, icid); |
4828 | if (!chan) | |
4829 | return 0; | |
4830 | ||
4831 | __clear_chan_timer(chan); | |
4832 | ||
4833 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
4834 | chan->local_amp_id = chan->move_id; | |
4835 | ||
4836 | if (!chan->local_amp_id && chan->hs_hchan) | |
4837 | __release_logical_link(chan); | |
4838 | ||
4839 | l2cap_move_done(chan); | |
4840 | } | |
4841 | ||
4842 | l2cap_chan_unlock(chan); | |
4843 | ||
8d5a04a1 MM |
4844 | return 0; |
4845 | } | |
4846 | ||
e2174ca4 | 4847 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 4848 | u16 to_multiplier) |
de73115a CT |
4849 | { |
4850 | u16 max_latency; | |
4851 | ||
4852 | if (min > max || min < 6 || max > 3200) | |
4853 | return -EINVAL; | |
4854 | ||
4855 | if (to_multiplier < 10 || to_multiplier > 3200) | |
4856 | return -EINVAL; | |
4857 | ||
4858 | if (max >= to_multiplier * 8) | |
4859 | return -EINVAL; | |
4860 | ||
4861 | max_latency = (to_multiplier * 8 / max) - 1; | |
4862 | if (latency > 499 || latency > max_latency) | |
4863 | return -EINVAL; | |
4864 | ||
4865 | return 0; | |
4866 | } | |
4867 | ||
4868 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 GP |
4869 | struct l2cap_cmd_hdr *cmd, |
4870 | u8 *data) | |
de73115a CT |
4871 | { |
4872 | struct hci_conn *hcon = conn->hcon; | |
4873 | struct l2cap_conn_param_update_req *req; | |
4874 | struct l2cap_conn_param_update_rsp rsp; | |
4875 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 4876 | int err; |
de73115a CT |
4877 | |
4878 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
4879 | return -EINVAL; | |
4880 | ||
4881 | cmd_len = __le16_to_cpu(cmd->len); | |
4882 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
4883 | return -EPROTO; | |
4884 | ||
4885 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
4886 | min = __le16_to_cpu(req->min); |
4887 | max = __le16_to_cpu(req->max); | |
de73115a CT |
4888 | latency = __le16_to_cpu(req->latency); |
4889 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
4890 | ||
4891 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 4892 | min, max, latency, to_multiplier); |
de73115a CT |
4893 | |
4894 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
4895 | |
4896 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
4897 | if (err) | |
ac73498c | 4898 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 4899 | else |
ac73498c | 4900 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
4901 | |
4902 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 4903 | sizeof(rsp), &rsp); |
de73115a | 4904 | |
2ce603eb CT |
4905 | if (!err) |
4906 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
4907 | ||
de73115a CT |
4908 | return 0; |
4909 | } | |
4910 | ||
3300d9a9 | 4911 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
4912 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4913 | u8 *data) | |
3300d9a9 CT |
4914 | { |
4915 | int err = 0; | |
4916 | ||
4917 | switch (cmd->code) { | |
4918 | case L2CAP_COMMAND_REJ: | |
4919 | l2cap_command_rej(conn, cmd, data); | |
4920 | break; | |
4921 | ||
4922 | case L2CAP_CONN_REQ: | |
4923 | err = l2cap_connect_req(conn, cmd, data); | |
4924 | break; | |
4925 | ||
4926 | case L2CAP_CONN_RSP: | |
f5a2598d | 4927 | case L2CAP_CREATE_CHAN_RSP: |
5909cf30 | 4928 | err = l2cap_connect_create_rsp(conn, cmd, data); |
3300d9a9 CT |
4929 | break; |
4930 | ||
4931 | case L2CAP_CONF_REQ: | |
4932 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
4933 | break; | |
4934 | ||
4935 | case L2CAP_CONF_RSP: | |
4936 | err = l2cap_config_rsp(conn, cmd, data); | |
4937 | break; | |
4938 | ||
4939 | case L2CAP_DISCONN_REQ: | |
4940 | err = l2cap_disconnect_req(conn, cmd, data); | |
4941 | break; | |
4942 | ||
4943 | case L2CAP_DISCONN_RSP: | |
4944 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
4945 | break; | |
4946 | ||
4947 | case L2CAP_ECHO_REQ: | |
4948 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
4949 | break; | |
4950 | ||
4951 | case L2CAP_ECHO_RSP: | |
4952 | break; | |
4953 | ||
4954 | case L2CAP_INFO_REQ: | |
4955 | err = l2cap_information_req(conn, cmd, data); | |
4956 | break; | |
4957 | ||
4958 | case L2CAP_INFO_RSP: | |
4959 | err = l2cap_information_rsp(conn, cmd, data); | |
4960 | break; | |
4961 | ||
f94ff6ff MM |
4962 | case L2CAP_CREATE_CHAN_REQ: |
4963 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
4964 | break; | |
4965 | ||
8d5a04a1 MM |
4966 | case L2CAP_MOVE_CHAN_REQ: |
4967 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
4968 | break; | |
4969 | ||
4970 | case L2CAP_MOVE_CHAN_RSP: | |
4971 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
4972 | break; | |
4973 | ||
4974 | case L2CAP_MOVE_CHAN_CFM: | |
4975 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
4976 | break; | |
4977 | ||
4978 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
4979 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
4980 | break; | |
4981 | ||
3300d9a9 CT |
4982 | default: |
4983 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
4984 | err = -EINVAL; | |
4985 | break; | |
4986 | } | |
4987 | ||
4988 | return err; | |
4989 | } | |
4990 | ||
4991 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2d792818 | 4992 | struct l2cap_cmd_hdr *cmd, u8 *data) |
3300d9a9 CT |
4993 | { |
4994 | switch (cmd->code) { | |
4995 | case L2CAP_COMMAND_REJ: | |
4996 | return 0; | |
4997 | ||
4998 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 4999 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
5000 | |
5001 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
5002 | return 0; | |
5003 | ||
5004 | default: | |
5005 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
5006 | return -EINVAL; | |
5007 | } | |
5008 | } | |
5009 | ||
5010 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2d792818 | 5011 | struct sk_buff *skb) |
1da177e4 LT |
5012 | { |
5013 | u8 *data = skb->data; | |
5014 | int len = skb->len; | |
5015 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5016 | int err; |
1da177e4 LT |
5017 | |
5018 | l2cap_raw_recv(conn, skb); | |
5019 | ||
5020 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 5021 | u16 cmd_len; |
1da177e4 LT |
5022 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5023 | data += L2CAP_CMD_HDR_SIZE; | |
5024 | len -= L2CAP_CMD_HDR_SIZE; | |
5025 | ||
88219a0f | 5026 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5027 | |
2d792818 GP |
5028 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5029 | cmd.ident); | |
1da177e4 | 5030 | |
88219a0f | 5031 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5032 | BT_DBG("corrupted command"); |
5033 | break; | |
5034 | } | |
5035 | ||
3300d9a9 CT |
5036 | if (conn->hcon->type == LE_LINK) |
5037 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
5038 | else | |
5039 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
5040 | |
5041 | if (err) { | |
e2fd318e | 5042 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5043 | |
5044 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
5045 | |
5046 | /* FIXME: Map err to a valid reason */ | |
ac73498c | 5047 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5048 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5049 | sizeof(rej), &rej); | |
1da177e4 LT |
5050 | } |
5051 | ||
88219a0f AV |
5052 | data += cmd_len; |
5053 | len -= cmd_len; | |
1da177e4 LT |
5054 | } |
5055 | ||
5056 | kfree_skb(skb); | |
5057 | } | |
5058 | ||
47d1ec61 | 5059 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5060 | { |
5061 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5062 | int hdr_size; |
5063 | ||
5064 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5065 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5066 | else | |
5067 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5068 | |
47d1ec61 | 5069 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5070 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5071 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5072 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5073 | ||
5074 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5075 | return -EBADMSG; |
fcc203c3 GP |
5076 | } |
5077 | return 0; | |
5078 | } | |
5079 | ||
6ea00485 | 5080 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5081 | { |
e31f7633 | 5082 | struct l2cap_ctrl control; |
d5392c8f | 5083 | |
e31f7633 | 5084 | BT_DBG("chan %p", chan); |
d5392c8f | 5085 | |
e31f7633 MM |
5086 | memset(&control, 0, sizeof(control)); |
5087 | control.sframe = 1; | |
5088 | control.final = 1; | |
5089 | control.reqseq = chan->buffer_seq; | |
5090 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5091 | |
e2ab4353 | 5092 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5093 | control.super = L2CAP_SUPER_RNR; |
5094 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5095 | } |
5096 | ||
e31f7633 MM |
5097 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5098 | chan->unacked_frames > 0) | |
5099 | __set_retrans_timer(chan); | |
d5392c8f | 5100 | |
e31f7633 | 5101 | /* Send pending iframes */ |
525cd185 | 5102 | l2cap_ertm_send(chan); |
d5392c8f | 5103 | |
e2ab4353 | 5104 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5105 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5106 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5107 | * send it now. | |
5108 | */ | |
5109 | control.super = L2CAP_SUPER_RR; | |
5110 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5111 | } |
5112 | } | |
5113 | ||
2d792818 GP |
5114 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5115 | struct sk_buff **last_frag) | |
18778a63 | 5116 | { |
84084a31 MM |
5117 | /* skb->len reflects data in skb as well as all fragments |
5118 | * skb->data_len reflects only data in fragments | |
5119 | */ | |
5120 | if (!skb_has_frag_list(skb)) | |
5121 | skb_shinfo(skb)->frag_list = new_frag; | |
5122 | ||
5123 | new_frag->next = NULL; | |
5124 | ||
5125 | (*last_frag)->next = new_frag; | |
5126 | *last_frag = new_frag; | |
5127 | ||
5128 | skb->len += new_frag->len; | |
5129 | skb->data_len += new_frag->len; | |
5130 | skb->truesize += new_frag->truesize; | |
5131 | } | |
5132 | ||
4b51dae9 MM |
5133 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5134 | struct l2cap_ctrl *control) | |
84084a31 MM |
5135 | { |
5136 | int err = -EINVAL; | |
18778a63 | 5137 | |
4b51dae9 | 5138 | switch (control->sar) { |
7e0ef6ee | 5139 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5140 | if (chan->sdu) |
5141 | break; | |
18778a63 | 5142 | |
80b98027 | 5143 | err = chan->ops->recv(chan, skb); |
84084a31 | 5144 | break; |
18778a63 | 5145 | |
7e0ef6ee | 5146 | case L2CAP_SAR_START: |
84084a31 MM |
5147 | if (chan->sdu) |
5148 | break; | |
18778a63 | 5149 | |
6f61fd47 | 5150 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5151 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5152 | |
84084a31 MM |
5153 | if (chan->sdu_len > chan->imtu) { |
5154 | err = -EMSGSIZE; | |
5155 | break; | |
5156 | } | |
1890d36b | 5157 | |
84084a31 MM |
5158 | if (skb->len >= chan->sdu_len) |
5159 | break; | |
18778a63 | 5160 | |
84084a31 MM |
5161 | chan->sdu = skb; |
5162 | chan->sdu_last_frag = skb; | |
18778a63 | 5163 | |
84084a31 MM |
5164 | skb = NULL; |
5165 | err = 0; | |
18778a63 GP |
5166 | break; |
5167 | ||
7e0ef6ee | 5168 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5169 | if (!chan->sdu) |
84084a31 | 5170 | break; |
18778a63 | 5171 | |
84084a31 MM |
5172 | append_skb_frag(chan->sdu, skb, |
5173 | &chan->sdu_last_frag); | |
5174 | skb = NULL; | |
18778a63 | 5175 | |
84084a31 MM |
5176 | if (chan->sdu->len >= chan->sdu_len) |
5177 | break; | |
4178ba46 | 5178 | |
84084a31 | 5179 | err = 0; |
18778a63 GP |
5180 | break; |
5181 | ||
7e0ef6ee | 5182 | case L2CAP_SAR_END: |
6f61fd47 | 5183 | if (!chan->sdu) |
84084a31 | 5184 | break; |
18778a63 | 5185 | |
84084a31 MM |
5186 | append_skb_frag(chan->sdu, skb, |
5187 | &chan->sdu_last_frag); | |
5188 | skb = NULL; | |
4178ba46 | 5189 | |
84084a31 MM |
5190 | if (chan->sdu->len != chan->sdu_len) |
5191 | break; | |
18778a63 | 5192 | |
80b98027 | 5193 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5194 | |
84084a31 MM |
5195 | if (!err) { |
5196 | /* Reassembly complete */ | |
5197 | chan->sdu = NULL; | |
5198 | chan->sdu_last_frag = NULL; | |
5199 | chan->sdu_len = 0; | |
1890d36b | 5200 | } |
18778a63 GP |
5201 | break; |
5202 | } | |
5203 | ||
84084a31 MM |
5204 | if (err) { |
5205 | kfree_skb(skb); | |
5206 | kfree_skb(chan->sdu); | |
5207 | chan->sdu = NULL; | |
5208 | chan->sdu_last_frag = NULL; | |
5209 | chan->sdu_len = 0; | |
5210 | } | |
18778a63 | 5211 | |
84084a31 | 5212 | return err; |
18778a63 GP |
5213 | } |
5214 | ||
32b32735 MM |
5215 | static int l2cap_resegment(struct l2cap_chan *chan) |
5216 | { | |
5217 | /* Placeholder */ | |
5218 | return 0; | |
5219 | } | |
5220 | ||
61aa4f5b | 5221 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5222 | { |
61aa4f5b | 5223 | u8 event; |
712132eb | 5224 | |
61aa4f5b MM |
5225 | if (chan->mode != L2CAP_MODE_ERTM) |
5226 | return; | |
712132eb | 5227 | |
61aa4f5b | 5228 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5229 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5230 | } |
5231 | ||
d2a7ac5d MM |
5232 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5233 | { | |
63838725 MM |
5234 | int err = 0; |
5235 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5236 | * until a gap is encountered. | |
5237 | */ | |
5238 | ||
5239 | BT_DBG("chan %p", chan); | |
5240 | ||
5241 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5242 | struct sk_buff *skb; | |
5243 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5244 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5245 | ||
5246 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5247 | ||
5248 | if (!skb) | |
5249 | break; | |
5250 | ||
5251 | skb_unlink(skb, &chan->srej_q); | |
5252 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5253 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5254 | if (err) | |
5255 | break; | |
5256 | } | |
5257 | ||
5258 | if (skb_queue_empty(&chan->srej_q)) { | |
5259 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5260 | l2cap_send_ack(chan); | |
5261 | } | |
5262 | ||
5263 | return err; | |
d2a7ac5d MM |
5264 | } |
5265 | ||
5266 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5267 | struct l2cap_ctrl *control) | |
5268 | { | |
f80842a8 MM |
5269 | struct sk_buff *skb; |
5270 | ||
5271 | BT_DBG("chan %p, control %p", chan, control); | |
5272 | ||
5273 | if (control->reqseq == chan->next_tx_seq) { | |
5274 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5275 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5276 | return; | |
5277 | } | |
5278 | ||
5279 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5280 | ||
5281 | if (skb == NULL) { | |
5282 | BT_DBG("Seq %d not available for retransmission", | |
5283 | control->reqseq); | |
5284 | return; | |
5285 | } | |
5286 | ||
5287 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5288 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5289 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5290 | return; | |
5291 | } | |
5292 | ||
5293 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5294 | ||
5295 | if (control->poll) { | |
5296 | l2cap_pass_to_tx(chan, control); | |
5297 | ||
5298 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5299 | l2cap_retransmit(chan, control); | |
5300 | l2cap_ertm_send(chan); | |
5301 | ||
5302 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5303 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5304 | chan->srej_save_reqseq = control->reqseq; | |
5305 | } | |
5306 | } else { | |
5307 | l2cap_pass_to_tx_fbit(chan, control); | |
5308 | ||
5309 | if (control->final) { | |
5310 | if (chan->srej_save_reqseq != control->reqseq || | |
5311 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5312 | &chan->conn_state)) | |
5313 | l2cap_retransmit(chan, control); | |
5314 | } else { | |
5315 | l2cap_retransmit(chan, control); | |
5316 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5317 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5318 | chan->srej_save_reqseq = control->reqseq; | |
5319 | } | |
5320 | } | |
5321 | } | |
d2a7ac5d MM |
5322 | } |
5323 | ||
5324 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5325 | struct l2cap_ctrl *control) | |
5326 | { | |
fcd289df MM |
5327 | struct sk_buff *skb; |
5328 | ||
5329 | BT_DBG("chan %p, control %p", chan, control); | |
5330 | ||
5331 | if (control->reqseq == chan->next_tx_seq) { | |
5332 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5333 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5334 | return; | |
5335 | } | |
5336 | ||
5337 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5338 | ||
5339 | if (chan->max_tx && skb && | |
5340 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
5341 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5342 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5343 | return; | |
5344 | } | |
5345 | ||
5346 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5347 | ||
5348 | l2cap_pass_to_tx(chan, control); | |
5349 | ||
5350 | if (control->final) { | |
5351 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
5352 | l2cap_retransmit_all(chan, control); | |
5353 | } else { | |
5354 | l2cap_retransmit_all(chan, control); | |
5355 | l2cap_ertm_send(chan); | |
5356 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
5357 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
5358 | } | |
d2a7ac5d MM |
5359 | } |
5360 | ||
4b51dae9 MM |
5361 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
5362 | { | |
5363 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
5364 | ||
5365 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
5366 | chan->expected_tx_seq); | |
5367 | ||
5368 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
5369 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 5370 | chan->tx_win) { |
4b51dae9 MM |
5371 | /* See notes below regarding "double poll" and |
5372 | * invalid packets. | |
5373 | */ | |
5374 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5375 | BT_DBG("Invalid/Ignore - after SREJ"); | |
5376 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5377 | } else { | |
5378 | BT_DBG("Invalid - in window after SREJ sent"); | |
5379 | return L2CAP_TXSEQ_INVALID; | |
5380 | } | |
5381 | } | |
5382 | ||
5383 | if (chan->srej_list.head == txseq) { | |
5384 | BT_DBG("Expected SREJ"); | |
5385 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
5386 | } | |
5387 | ||
5388 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
5389 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
5390 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
5391 | } | |
5392 | ||
5393 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
5394 | BT_DBG("Unexpected SREJ - not requested"); | |
5395 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
5396 | } | |
5397 | } | |
5398 | ||
5399 | if (chan->expected_tx_seq == txseq) { | |
5400 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
5401 | chan->tx_win) { | |
5402 | BT_DBG("Invalid - txseq outside tx window"); | |
5403 | return L2CAP_TXSEQ_INVALID; | |
5404 | } else { | |
5405 | BT_DBG("Expected"); | |
5406 | return L2CAP_TXSEQ_EXPECTED; | |
5407 | } | |
5408 | } | |
5409 | ||
5410 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 5411 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
5412 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
5413 | return L2CAP_TXSEQ_DUPLICATE; | |
5414 | } | |
5415 | ||
5416 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
5417 | /* A source of invalid packets is a "double poll" condition, | |
5418 | * where delays cause us to send multiple poll packets. If | |
5419 | * the remote stack receives and processes both polls, | |
5420 | * sequence numbers can wrap around in such a way that a | |
5421 | * resent frame has a sequence number that looks like new data | |
5422 | * with a sequence gap. This would trigger an erroneous SREJ | |
5423 | * request. | |
5424 | * | |
5425 | * Fortunately, this is impossible with a tx window that's | |
5426 | * less than half of the maximum sequence number, which allows | |
5427 | * invalid frames to be safely ignored. | |
5428 | * | |
5429 | * With tx window sizes greater than half of the tx window | |
5430 | * maximum, the frame is invalid and cannot be ignored. This | |
5431 | * causes a disconnect. | |
5432 | */ | |
5433 | ||
5434 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5435 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
5436 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5437 | } else { | |
5438 | BT_DBG("Invalid - txseq outside tx window"); | |
5439 | return L2CAP_TXSEQ_INVALID; | |
5440 | } | |
5441 | } else { | |
5442 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
5443 | return L2CAP_TXSEQ_UNEXPECTED; | |
5444 | } | |
5445 | } | |
5446 | ||
d2a7ac5d MM |
5447 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
5448 | struct l2cap_ctrl *control, | |
5449 | struct sk_buff *skb, u8 event) | |
5450 | { | |
5451 | int err = 0; | |
5452 | bool skb_in_use = 0; | |
5453 | ||
5454 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5455 | event); | |
5456 | ||
5457 | switch (event) { | |
5458 | case L2CAP_EV_RECV_IFRAME: | |
5459 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
5460 | case L2CAP_TXSEQ_EXPECTED: | |
5461 | l2cap_pass_to_tx(chan, control); | |
5462 | ||
5463 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5464 | BT_DBG("Busy, discarding expected seq %d", | |
5465 | control->txseq); | |
5466 | break; | |
5467 | } | |
5468 | ||
5469 | chan->expected_tx_seq = __next_seq(chan, | |
5470 | control->txseq); | |
5471 | ||
5472 | chan->buffer_seq = chan->expected_tx_seq; | |
5473 | skb_in_use = 1; | |
5474 | ||
5475 | err = l2cap_reassemble_sdu(chan, skb, control); | |
5476 | if (err) | |
5477 | break; | |
5478 | ||
5479 | if (control->final) { | |
5480 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5481 | &chan->conn_state)) { | |
5482 | control->final = 0; | |
5483 | l2cap_retransmit_all(chan, control); | |
5484 | l2cap_ertm_send(chan); | |
5485 | } | |
5486 | } | |
5487 | ||
5488 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
5489 | l2cap_send_ack(chan); | |
5490 | break; | |
5491 | case L2CAP_TXSEQ_UNEXPECTED: | |
5492 | l2cap_pass_to_tx(chan, control); | |
5493 | ||
5494 | /* Can't issue SREJ frames in the local busy state. | |
5495 | * Drop this frame, it will be seen as missing | |
5496 | * when local busy is exited. | |
5497 | */ | |
5498 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5499 | BT_DBG("Busy, discarding unexpected seq %d", | |
5500 | control->txseq); | |
5501 | break; | |
5502 | } | |
5503 | ||
5504 | /* There was a gap in the sequence, so an SREJ | |
5505 | * must be sent for each missing frame. The | |
5506 | * current frame is stored for later use. | |
5507 | */ | |
5508 | skb_queue_tail(&chan->srej_q, skb); | |
5509 | skb_in_use = 1; | |
5510 | BT_DBG("Queued %p (queue len %d)", skb, | |
5511 | skb_queue_len(&chan->srej_q)); | |
5512 | ||
5513 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5514 | l2cap_seq_list_clear(&chan->srej_list); | |
5515 | l2cap_send_srej(chan, control->txseq); | |
5516 | ||
5517 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
5518 | break; | |
5519 | case L2CAP_TXSEQ_DUPLICATE: | |
5520 | l2cap_pass_to_tx(chan, control); | |
5521 | break; | |
5522 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5523 | break; | |
5524 | case L2CAP_TXSEQ_INVALID: | |
5525 | default: | |
5526 | l2cap_send_disconn_req(chan->conn, chan, | |
5527 | ECONNRESET); | |
5528 | break; | |
5529 | } | |
5530 | break; | |
5531 | case L2CAP_EV_RECV_RR: | |
5532 | l2cap_pass_to_tx(chan, control); | |
5533 | if (control->final) { | |
5534 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5535 | ||
5536 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5537 | &chan->conn_state)) { | |
5538 | control->final = 0; | |
5539 | l2cap_retransmit_all(chan, control); | |
5540 | } | |
5541 | ||
5542 | l2cap_ertm_send(chan); | |
5543 | } else if (control->poll) { | |
5544 | l2cap_send_i_or_rr_or_rnr(chan); | |
5545 | } else { | |
5546 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5547 | &chan->conn_state) && | |
5548 | chan->unacked_frames) | |
5549 | __set_retrans_timer(chan); | |
5550 | ||
5551 | l2cap_ertm_send(chan); | |
5552 | } | |
5553 | break; | |
5554 | case L2CAP_EV_RECV_RNR: | |
5555 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5556 | l2cap_pass_to_tx(chan, control); | |
5557 | if (control && control->poll) { | |
5558 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5559 | l2cap_send_rr_or_rnr(chan, 0); | |
5560 | } | |
5561 | __clear_retrans_timer(chan); | |
5562 | l2cap_seq_list_clear(&chan->retrans_list); | |
5563 | break; | |
5564 | case L2CAP_EV_RECV_REJ: | |
5565 | l2cap_handle_rej(chan, control); | |
5566 | break; | |
5567 | case L2CAP_EV_RECV_SREJ: | |
5568 | l2cap_handle_srej(chan, control); | |
5569 | break; | |
5570 | default: | |
5571 | break; | |
5572 | } | |
5573 | ||
5574 | if (skb && !skb_in_use) { | |
5575 | BT_DBG("Freeing %p", skb); | |
5576 | kfree_skb(skb); | |
5577 | } | |
5578 | ||
5579 | return err; | |
5580 | } | |
5581 | ||
5582 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
5583 | struct l2cap_ctrl *control, | |
5584 | struct sk_buff *skb, u8 event) | |
5585 | { | |
5586 | int err = 0; | |
5587 | u16 txseq = control->txseq; | |
5588 | bool skb_in_use = 0; | |
5589 | ||
5590 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5591 | event); | |
5592 | ||
5593 | switch (event) { | |
5594 | case L2CAP_EV_RECV_IFRAME: | |
5595 | switch (l2cap_classify_txseq(chan, txseq)) { | |
5596 | case L2CAP_TXSEQ_EXPECTED: | |
5597 | /* Keep frame for reassembly later */ | |
5598 | l2cap_pass_to_tx(chan, control); | |
5599 | skb_queue_tail(&chan->srej_q, skb); | |
5600 | skb_in_use = 1; | |
5601 | BT_DBG("Queued %p (queue len %d)", skb, | |
5602 | skb_queue_len(&chan->srej_q)); | |
5603 | ||
5604 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
5605 | break; | |
5606 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
5607 | l2cap_seq_list_pop(&chan->srej_list); | |
5608 | ||
5609 | l2cap_pass_to_tx(chan, control); | |
5610 | skb_queue_tail(&chan->srej_q, skb); | |
5611 | skb_in_use = 1; | |
5612 | BT_DBG("Queued %p (queue len %d)", skb, | |
5613 | skb_queue_len(&chan->srej_q)); | |
5614 | ||
5615 | err = l2cap_rx_queued_iframes(chan); | |
5616 | if (err) | |
5617 | break; | |
5618 | ||
5619 | break; | |
5620 | case L2CAP_TXSEQ_UNEXPECTED: | |
5621 | /* Got a frame that can't be reassembled yet. | |
5622 | * Save it for later, and send SREJs to cover | |
5623 | * the missing frames. | |
5624 | */ | |
5625 | skb_queue_tail(&chan->srej_q, skb); | |
5626 | skb_in_use = 1; | |
5627 | BT_DBG("Queued %p (queue len %d)", skb, | |
5628 | skb_queue_len(&chan->srej_q)); | |
5629 | ||
5630 | l2cap_pass_to_tx(chan, control); | |
5631 | l2cap_send_srej(chan, control->txseq); | |
5632 | break; | |
5633 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
5634 | /* This frame was requested with an SREJ, but | |
5635 | * some expected retransmitted frames are | |
5636 | * missing. Request retransmission of missing | |
5637 | * SREJ'd frames. | |
5638 | */ | |
5639 | skb_queue_tail(&chan->srej_q, skb); | |
5640 | skb_in_use = 1; | |
5641 | BT_DBG("Queued %p (queue len %d)", skb, | |
5642 | skb_queue_len(&chan->srej_q)); | |
5643 | ||
5644 | l2cap_pass_to_tx(chan, control); | |
5645 | l2cap_send_srej_list(chan, control->txseq); | |
5646 | break; | |
5647 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
5648 | /* We've already queued this frame. Drop this copy. */ | |
5649 | l2cap_pass_to_tx(chan, control); | |
5650 | break; | |
5651 | case L2CAP_TXSEQ_DUPLICATE: | |
5652 | /* Expecting a later sequence number, so this frame | |
5653 | * was already received. Ignore it completely. | |
5654 | */ | |
5655 | break; | |
5656 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5657 | break; | |
5658 | case L2CAP_TXSEQ_INVALID: | |
5659 | default: | |
5660 | l2cap_send_disconn_req(chan->conn, chan, | |
5661 | ECONNRESET); | |
5662 | break; | |
5663 | } | |
5664 | break; | |
5665 | case L2CAP_EV_RECV_RR: | |
5666 | l2cap_pass_to_tx(chan, control); | |
5667 | if (control->final) { | |
5668 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5669 | ||
5670 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5671 | &chan->conn_state)) { | |
5672 | control->final = 0; | |
5673 | l2cap_retransmit_all(chan, control); | |
5674 | } | |
5675 | ||
5676 | l2cap_ertm_send(chan); | |
5677 | } else if (control->poll) { | |
5678 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5679 | &chan->conn_state) && | |
5680 | chan->unacked_frames) { | |
5681 | __set_retrans_timer(chan); | |
5682 | } | |
5683 | ||
5684 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5685 | l2cap_send_srej_tail(chan); | |
5686 | } else { | |
5687 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5688 | &chan->conn_state) && | |
5689 | chan->unacked_frames) | |
5690 | __set_retrans_timer(chan); | |
5691 | ||
5692 | l2cap_send_ack(chan); | |
5693 | } | |
5694 | break; | |
5695 | case L2CAP_EV_RECV_RNR: | |
5696 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5697 | l2cap_pass_to_tx(chan, control); | |
5698 | if (control->poll) { | |
5699 | l2cap_send_srej_tail(chan); | |
5700 | } else { | |
5701 | struct l2cap_ctrl rr_control; | |
5702 | memset(&rr_control, 0, sizeof(rr_control)); | |
5703 | rr_control.sframe = 1; | |
5704 | rr_control.super = L2CAP_SUPER_RR; | |
5705 | rr_control.reqseq = chan->buffer_seq; | |
5706 | l2cap_send_sframe(chan, &rr_control); | |
5707 | } | |
5708 | ||
5709 | break; | |
5710 | case L2CAP_EV_RECV_REJ: | |
5711 | l2cap_handle_rej(chan, control); | |
5712 | break; | |
5713 | case L2CAP_EV_RECV_SREJ: | |
5714 | l2cap_handle_srej(chan, control); | |
5715 | break; | |
5716 | } | |
5717 | ||
5718 | if (skb && !skb_in_use) { | |
5719 | BT_DBG("Freeing %p", skb); | |
5720 | kfree_skb(skb); | |
5721 | } | |
5722 | ||
5723 | return err; | |
5724 | } | |
5725 | ||
32b32735 MM |
5726 | static int l2cap_finish_move(struct l2cap_chan *chan) |
5727 | { | |
5728 | BT_DBG("chan %p", chan); | |
5729 | ||
5730 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5731 | ||
5732 | if (chan->hs_hcon) | |
5733 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
5734 | else | |
5735 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
5736 | ||
5737 | return l2cap_resegment(chan); | |
5738 | } | |
5739 | ||
5740 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
5741 | struct l2cap_ctrl *control, | |
5742 | struct sk_buff *skb, u8 event) | |
5743 | { | |
5744 | int err; | |
5745 | ||
5746 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5747 | event); | |
5748 | ||
5749 | if (!control->poll) | |
5750 | return -EPROTO; | |
5751 | ||
5752 | l2cap_process_reqseq(chan, control->reqseq); | |
5753 | ||
5754 | if (!skb_queue_empty(&chan->tx_q)) | |
5755 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
5756 | else | |
5757 | chan->tx_send_head = NULL; | |
5758 | ||
5759 | /* Rewind next_tx_seq to the point expected | |
5760 | * by the receiver. | |
5761 | */ | |
5762 | chan->next_tx_seq = control->reqseq; | |
5763 | chan->unacked_frames = 0; | |
5764 | ||
5765 | err = l2cap_finish_move(chan); | |
5766 | if (err) | |
5767 | return err; | |
5768 | ||
5769 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5770 | l2cap_send_i_or_rr_or_rnr(chan); | |
5771 | ||
5772 | if (event == L2CAP_EV_RECV_IFRAME) | |
5773 | return -EPROTO; | |
5774 | ||
5775 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
5776 | } | |
5777 | ||
5778 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
5779 | struct l2cap_ctrl *control, | |
5780 | struct sk_buff *skb, u8 event) | |
5781 | { | |
5782 | int err; | |
5783 | ||
5784 | if (!control->final) | |
5785 | return -EPROTO; | |
5786 | ||
5787 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5788 | ||
5789 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5790 | l2cap_process_reqseq(chan, control->reqseq); | |
5791 | ||
5792 | if (!skb_queue_empty(&chan->tx_q)) | |
5793 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
5794 | else | |
5795 | chan->tx_send_head = NULL; | |
5796 | ||
5797 | /* Rewind next_tx_seq to the point expected | |
5798 | * by the receiver. | |
5799 | */ | |
5800 | chan->next_tx_seq = control->reqseq; | |
5801 | chan->unacked_frames = 0; | |
5802 | ||
5803 | if (chan->hs_hcon) | |
5804 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
5805 | else | |
5806 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
5807 | ||
5808 | err = l2cap_resegment(chan); | |
5809 | ||
5810 | if (!err) | |
5811 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5812 | ||
5813 | return err; | |
5814 | } | |
5815 | ||
d2a7ac5d MM |
5816 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
5817 | { | |
5818 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
5819 | u16 unacked; | |
5820 | ||
5821 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
5822 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
5823 | } | |
5824 | ||
cec8ab6e MM |
5825 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
5826 | struct sk_buff *skb, u8 event) | |
218bb9df | 5827 | { |
d2a7ac5d MM |
5828 | int err = 0; |
5829 | ||
5830 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
5831 | control, skb, event, chan->rx_state); | |
5832 | ||
5833 | if (__valid_reqseq(chan, control->reqseq)) { | |
5834 | switch (chan->rx_state) { | |
5835 | case L2CAP_RX_STATE_RECV: | |
5836 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
5837 | break; | |
5838 | case L2CAP_RX_STATE_SREJ_SENT: | |
5839 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
5840 | event); | |
5841 | break; | |
32b32735 MM |
5842 | case L2CAP_RX_STATE_WAIT_P: |
5843 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
5844 | break; | |
5845 | case L2CAP_RX_STATE_WAIT_F: | |
5846 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
5847 | break; | |
d2a7ac5d MM |
5848 | default: |
5849 | /* shut it down */ | |
5850 | break; | |
5851 | } | |
5852 | } else { | |
5853 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
5854 | control->reqseq, chan->next_tx_seq, | |
5855 | chan->expected_ack_seq); | |
5856 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
5857 | } | |
5858 | ||
5859 | return err; | |
cec8ab6e MM |
5860 | } |
5861 | ||
5862 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
5863 | struct sk_buff *skb) | |
5864 | { | |
4b51dae9 MM |
5865 | int err = 0; |
5866 | ||
5867 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
5868 | chan->rx_state); | |
5869 | ||
5870 | if (l2cap_classify_txseq(chan, control->txseq) == | |
5871 | L2CAP_TXSEQ_EXPECTED) { | |
5872 | l2cap_pass_to_tx(chan, control); | |
5873 | ||
5874 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
5875 | __next_seq(chan, chan->buffer_seq)); | |
5876 | ||
5877 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5878 | ||
5879 | l2cap_reassemble_sdu(chan, skb, control); | |
5880 | } else { | |
5881 | if (chan->sdu) { | |
5882 | kfree_skb(chan->sdu); | |
5883 | chan->sdu = NULL; | |
5884 | } | |
5885 | chan->sdu_last_frag = NULL; | |
5886 | chan->sdu_len = 0; | |
5887 | ||
5888 | if (skb) { | |
5889 | BT_DBG("Freeing %p", skb); | |
5890 | kfree_skb(skb); | |
5891 | } | |
5892 | } | |
5893 | ||
5894 | chan->last_acked_seq = control->txseq; | |
5895 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
5896 | ||
5897 | return err; | |
cec8ab6e MM |
5898 | } |
5899 | ||
5900 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
5901 | { | |
5902 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
5903 | u16 len; | |
5904 | u8 event; | |
218bb9df | 5905 | |
b76bbd66 MM |
5906 | __unpack_control(chan, skb); |
5907 | ||
218bb9df GP |
5908 | len = skb->len; |
5909 | ||
5910 | /* | |
5911 | * We can just drop the corrupted I-frame here. | |
5912 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 5913 | * procedures and ask for retransmission. |
218bb9df | 5914 | */ |
47d1ec61 | 5915 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
5916 | goto drop; |
5917 | ||
cec8ab6e | 5918 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 5919 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 5920 | |
47d1ec61 | 5921 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 5922 | len -= L2CAP_FCS_SIZE; |
218bb9df | 5923 | |
47d1ec61 | 5924 | if (len > chan->mps) { |
8c1d787b | 5925 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5926 | goto drop; |
5927 | } | |
5928 | ||
cec8ab6e MM |
5929 | if (!control->sframe) { |
5930 | int err; | |
218bb9df | 5931 | |
cec8ab6e MM |
5932 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
5933 | control->sar, control->reqseq, control->final, | |
5934 | control->txseq); | |
218bb9df | 5935 | |
cec8ab6e MM |
5936 | /* Validate F-bit - F=0 always valid, F=1 only |
5937 | * valid in TX WAIT_F | |
5938 | */ | |
5939 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 5940 | goto drop; |
cec8ab6e MM |
5941 | |
5942 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
5943 | event = L2CAP_EV_RECV_IFRAME; | |
5944 | err = l2cap_rx(chan, control, skb, event); | |
5945 | } else { | |
5946 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
5947 | } |
5948 | ||
cec8ab6e MM |
5949 | if (err) |
5950 | l2cap_send_disconn_req(chan->conn, chan, | |
5951 | ECONNRESET); | |
218bb9df | 5952 | } else { |
cec8ab6e MM |
5953 | const u8 rx_func_to_event[4] = { |
5954 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
5955 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
5956 | }; | |
5957 | ||
5958 | /* Only I-frames are expected in streaming mode */ | |
5959 | if (chan->mode == L2CAP_MODE_STREAMING) | |
5960 | goto drop; | |
5961 | ||
5962 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
5963 | control->reqseq, control->final, control->poll, | |
5964 | control->super); | |
5965 | ||
218bb9df GP |
5966 | if (len != 0) { |
5967 | BT_ERR("%d", len); | |
8c1d787b | 5968 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
5969 | goto drop; |
5970 | } | |
5971 | ||
cec8ab6e MM |
5972 | /* Validate F and P bits */ |
5973 | if (control->final && (control->poll || | |
5974 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
5975 | goto drop; | |
5976 | ||
5977 | event = rx_func_to_event[control->super]; | |
5978 | if (l2cap_rx(chan, control, skb, event)) | |
5979 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
218bb9df GP |
5980 | } |
5981 | ||
5982 | return 0; | |
5983 | ||
5984 | drop: | |
5985 | kfree_skb(skb); | |
5986 | return 0; | |
5987 | } | |
5988 | ||
13ca56e0 AE |
5989 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
5990 | struct sk_buff *skb) | |
1da177e4 | 5991 | { |
48454079 | 5992 | struct l2cap_chan *chan; |
1da177e4 | 5993 | |
baa7e1fa | 5994 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 5995 | if (!chan) { |
97e8e89d AE |
5996 | if (cid == L2CAP_CID_A2MP) { |
5997 | chan = a2mp_channel_create(conn, skb); | |
5998 | if (!chan) { | |
5999 | kfree_skb(skb); | |
13ca56e0 | 6000 | return; |
97e8e89d AE |
6001 | } |
6002 | ||
6003 | l2cap_chan_lock(chan); | |
6004 | } else { | |
6005 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6006 | /* Drop packet and return */ | |
6007 | kfree_skb(skb); | |
13ca56e0 | 6008 | return; |
97e8e89d | 6009 | } |
1da177e4 LT |
6010 | } |
6011 | ||
49208c9c | 6012 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6013 | |
89bc500e | 6014 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6015 | goto drop; |
6016 | ||
0c1bc5c6 | 6017 | switch (chan->mode) { |
1c2acffb GP |
6018 | case L2CAP_MODE_BASIC: |
6019 | /* If socket recv buffers overflows we drop data here | |
6020 | * which is *bad* because L2CAP has to be reliable. | |
6021 | * But we don't have any other choice. L2CAP doesn't | |
6022 | * provide flow control mechanism. */ | |
1da177e4 | 6023 | |
0c1bc5c6 | 6024 | if (chan->imtu < skb->len) |
1c2acffb | 6025 | goto drop; |
1da177e4 | 6026 | |
80b98027 | 6027 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6028 | goto done; |
6029 | break; | |
6030 | ||
6031 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6032 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6033 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6034 | goto done; |
6035 | ||
1c2acffb | 6036 | default: |
0c1bc5c6 | 6037 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6038 | break; |
6039 | } | |
1da177e4 LT |
6040 | |
6041 | drop: | |
6042 | kfree_skb(skb); | |
6043 | ||
6044 | done: | |
6be36555 | 6045 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6046 | } |
6047 | ||
84104b24 AE |
6048 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6049 | struct sk_buff *skb) | |
1da177e4 | 6050 | { |
23691d75 | 6051 | struct l2cap_chan *chan; |
1da177e4 | 6052 | |
c2287681 | 6053 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 6054 | if (!chan) |
1da177e4 LT |
6055 | goto drop; |
6056 | ||
5b4cedaa | 6057 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6058 | |
89bc500e | 6059 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6060 | goto drop; |
6061 | ||
e13e21dc | 6062 | if (chan->imtu < skb->len) |
1da177e4 LT |
6063 | goto drop; |
6064 | ||
80b98027 | 6065 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 6066 | return; |
1da177e4 LT |
6067 | |
6068 | drop: | |
6069 | kfree_skb(skb); | |
1da177e4 LT |
6070 | } |
6071 | ||
6810fca7 AE |
6072 | static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
6073 | struct sk_buff *skb) | |
9f69bda6 | 6074 | { |
23691d75 | 6075 | struct l2cap_chan *chan; |
9f69bda6 | 6076 | |
c2287681 | 6077 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 6078 | if (!chan) |
9f69bda6 GP |
6079 | goto drop; |
6080 | ||
5b4cedaa | 6081 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 6082 | |
89bc500e | 6083 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
6084 | goto drop; |
6085 | ||
e13e21dc | 6086 | if (chan->imtu < skb->len) |
9f69bda6 GP |
6087 | goto drop; |
6088 | ||
80b98027 | 6089 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 6090 | return; |
9f69bda6 GP |
6091 | |
6092 | drop: | |
6093 | kfree_skb(skb); | |
9f69bda6 GP |
6094 | } |
6095 | ||
1da177e4 LT |
6096 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
6097 | { | |
6098 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
6099 | u16 cid, len; |
6100 | __le16 psm; | |
1da177e4 LT |
6101 | |
6102 | skb_pull(skb, L2CAP_HDR_SIZE); | |
6103 | cid = __le16_to_cpu(lh->cid); | |
6104 | len = __le16_to_cpu(lh->len); | |
6105 | ||
1c2acffb GP |
6106 | if (len != skb->len) { |
6107 | kfree_skb(skb); | |
6108 | return; | |
6109 | } | |
6110 | ||
1da177e4 LT |
6111 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6112 | ||
6113 | switch (cid) { | |
3300d9a9 | 6114 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 6115 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6116 | l2cap_sig_channel(conn, skb); |
6117 | break; | |
6118 | ||
8db4dc46 | 6119 | case L2CAP_CID_CONN_LESS: |
097db76c | 6120 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6121 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6122 | l2cap_conless_channel(conn, psm, skb); |
6123 | break; | |
6124 | ||
9f69bda6 GP |
6125 | case L2CAP_CID_LE_DATA: |
6126 | l2cap_att_channel(conn, cid, skb); | |
6127 | break; | |
6128 | ||
b501d6a1 AB |
6129 | case L2CAP_CID_SMP: |
6130 | if (smp_sig_channel(conn, skb)) | |
6131 | l2cap_conn_del(conn->hcon, EACCES); | |
6132 | break; | |
6133 | ||
1da177e4 LT |
6134 | default: |
6135 | l2cap_data_channel(conn, cid, skb); | |
6136 | break; | |
6137 | } | |
6138 | } | |
6139 | ||
6140 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
6141 | ||
686ebf28 | 6142 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
6143 | { |
6144 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 6145 | struct l2cap_chan *c; |
1da177e4 | 6146 | |
6ed93dc6 | 6147 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
6148 | |
6149 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
6150 | read_lock(&chan_list_lock); |
6151 | list_for_each_entry(c, &chan_list, global_l) { | |
6152 | struct sock *sk = c->sk; | |
4343478f | 6153 | |
89bc500e | 6154 | if (c->state != BT_LISTEN) |
1da177e4 LT |
6155 | continue; |
6156 | ||
6157 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 6158 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 6159 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 6160 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 6161 | exact++; |
2af6b9d5 MH |
6162 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
6163 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 6164 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
6165 | lm2 |= HCI_LM_MASTER; |
6166 | } | |
1da177e4 | 6167 | } |
23691d75 | 6168 | read_unlock(&chan_list_lock); |
1da177e4 LT |
6169 | |
6170 | return exact ? lm1 : lm2; | |
6171 | } | |
6172 | ||
9e664631 | 6173 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 6174 | { |
0139418c MH |
6175 | struct l2cap_conn *conn; |
6176 | ||
6ed93dc6 | 6177 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 6178 | |
1da177e4 | 6179 | if (!status) { |
1da177e4 LT |
6180 | conn = l2cap_conn_add(hcon, status); |
6181 | if (conn) | |
6182 | l2cap_conn_ready(conn); | |
0139418c | 6183 | } else |
e175072f | 6184 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 | 6185 | |
1da177e4 LT |
6186 | } |
6187 | ||
686ebf28 | 6188 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
6189 | { |
6190 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6191 | ||
6192 | BT_DBG("hcon %p", hcon); | |
6193 | ||
686ebf28 | 6194 | if (!conn) |
9f5a0d7b | 6195 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
6196 | return conn->disc_reason; |
6197 | } | |
6198 | ||
9e664631 | 6199 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
6200 | { |
6201 | BT_DBG("hcon %p reason %d", hcon, reason); | |
6202 | ||
e175072f | 6203 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
6204 | } |
6205 | ||
4343478f | 6206 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 6207 | { |
715ec005 | 6208 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
6209 | return; |
6210 | ||
f62e4323 | 6211 | if (encrypt == 0x00) { |
4343478f | 6212 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 6213 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 6214 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 6215 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 6216 | } else { |
4343478f | 6217 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 6218 | __clear_chan_timer(chan); |
f62e4323 MH |
6219 | } |
6220 | } | |
6221 | ||
686ebf28 | 6222 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 6223 | { |
0139418c | 6224 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 6225 | struct l2cap_chan *chan; |
1da177e4 | 6226 | |
0139418c | 6227 | if (!conn) |
1da177e4 | 6228 | return 0; |
0139418c | 6229 | |
89d8b407 | 6230 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 6231 | |
160dc6ac | 6232 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
6233 | if (!status && encrypt) |
6234 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 6235 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
6236 | } |
6237 | ||
3df91ea2 | 6238 | mutex_lock(&conn->chan_lock); |
1da177e4 | 6239 | |
3df91ea2 | 6240 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 6241 | l2cap_chan_lock(chan); |
1da177e4 | 6242 | |
89d8b407 AE |
6243 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
6244 | state_to_string(chan->state)); | |
f1cb9af5 | 6245 | |
78eb2f98 AE |
6246 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
6247 | l2cap_chan_unlock(chan); | |
6248 | continue; | |
6249 | } | |
6250 | ||
f1cb9af5 VCG |
6251 | if (chan->scid == L2CAP_CID_LE_DATA) { |
6252 | if (!status && encrypt) { | |
6253 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 6254 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
6255 | } |
6256 | ||
6be36555 | 6257 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
6258 | continue; |
6259 | } | |
6260 | ||
c1360a1c | 6261 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 6262 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
6263 | continue; |
6264 | } | |
6265 | ||
89bc500e | 6266 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 6267 | chan->state == BT_CONFIG)) { |
a7d7723a GP |
6268 | struct sock *sk = chan->sk; |
6269 | ||
c5daa683 | 6270 | clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags); |
a7d7723a GP |
6271 | sk->sk_state_change(sk); |
6272 | ||
4343478f | 6273 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 6274 | l2cap_chan_unlock(chan); |
9719f8af MH |
6275 | continue; |
6276 | } | |
6277 | ||
89bc500e | 6278 | if (chan->state == BT_CONNECT) { |
b1235d79 | 6279 | if (!status) { |
93c3e8f5 | 6280 | l2cap_start_connection(chan); |
b1235d79 | 6281 | } else { |
ba13ccd9 | 6282 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 6283 | } |
89bc500e | 6284 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 6285 | struct sock *sk = chan->sk; |
b1235d79 | 6286 | struct l2cap_conn_rsp rsp; |
df3c3931 | 6287 | __u16 res, stat; |
1da177e4 | 6288 | |
6be36555 AE |
6289 | lock_sock(sk); |
6290 | ||
b1235d79 | 6291 | if (!status) { |
c5daa683 GP |
6292 | if (test_bit(BT_SK_DEFER_SETUP, |
6293 | &bt_sk(sk)->flags)) { | |
df3c3931 JH |
6294 | res = L2CAP_CR_PEND; |
6295 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 6296 | chan->ops->defer(chan); |
df3c3931 | 6297 | } else { |
0e587be7 | 6298 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
6299 | res = L2CAP_CR_SUCCESS; |
6300 | stat = L2CAP_CS_NO_INFO; | |
6301 | } | |
b1235d79 | 6302 | } else { |
0e587be7 | 6303 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 6304 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
6305 | res = L2CAP_CR_SEC_BLOCK; |
6306 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
6307 | } |
6308 | ||
6be36555 AE |
6309 | release_sock(sk); |
6310 | ||
fe4128e0 GP |
6311 | rsp.scid = cpu_to_le16(chan->dcid); |
6312 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
6313 | rsp.result = cpu_to_le16(res); |
6314 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 6315 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 6316 | sizeof(rsp), &rsp); |
2d369359 MM |
6317 | |
6318 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
6319 | res == L2CAP_CR_SUCCESS) { | |
6320 | char buf[128]; | |
6321 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
6322 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
6323 | L2CAP_CONF_REQ, | |
6324 | l2cap_build_conf_req(chan, buf), | |
6325 | buf); | |
6326 | chan->num_conf_req++; | |
6327 | } | |
b1235d79 | 6328 | } |
1da177e4 | 6329 | |
6be36555 | 6330 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6331 | } |
6332 | ||
3df91ea2 | 6333 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 6334 | |
1da177e4 LT |
6335 | return 0; |
6336 | } | |
6337 | ||
686ebf28 | 6338 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
6339 | { |
6340 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
6341 | struct l2cap_hdr *hdr; |
6342 | int len; | |
1da177e4 | 6343 | |
1d13a254 AE |
6344 | /* For AMP controller do not create l2cap conn */ |
6345 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
6346 | goto drop; | |
1da177e4 | 6347 | |
5a08ecce AE |
6348 | if (!conn) |
6349 | conn = l2cap_conn_add(hcon, 0); | |
6350 | ||
6351 | if (!conn) | |
1da177e4 LT |
6352 | goto drop; |
6353 | ||
6354 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
6355 | ||
d73a0988 AE |
6356 | switch (flags) { |
6357 | case ACL_START: | |
6358 | case ACL_START_NO_FLUSH: | |
6359 | case ACL_COMPLETE: | |
1da177e4 LT |
6360 | if (conn->rx_len) { |
6361 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
6362 | kfree_skb(conn->rx_skb); | |
6363 | conn->rx_skb = NULL; | |
6364 | conn->rx_len = 0; | |
6365 | l2cap_conn_unreliable(conn, ECOMM); | |
6366 | } | |
6367 | ||
aae7fe22 AE |
6368 | /* Start fragment always begin with Basic L2CAP header */ |
6369 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
6370 | BT_ERR("Frame is too short (len %d)", skb->len); |
6371 | l2cap_conn_unreliable(conn, ECOMM); | |
6372 | goto drop; | |
6373 | } | |
6374 | ||
6375 | hdr = (struct l2cap_hdr *) skb->data; | |
6376 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
6377 | ||
6378 | if (len == skb->len) { | |
6379 | /* Complete frame received */ | |
6380 | l2cap_recv_frame(conn, skb); | |
6381 | return 0; | |
6382 | } | |
6383 | ||
6384 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
6385 | ||
6386 | if (skb->len > len) { | |
6387 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 6388 | skb->len, len); |
1da177e4 LT |
6389 | l2cap_conn_unreliable(conn, ECOMM); |
6390 | goto drop; | |
6391 | } | |
6392 | ||
6393 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 6394 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 6395 | if (!conn->rx_skb) |
1da177e4 LT |
6396 | goto drop; |
6397 | ||
d626f62b | 6398 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6399 | skb->len); |
1da177e4 | 6400 | conn->rx_len = len - skb->len; |
d73a0988 AE |
6401 | break; |
6402 | ||
6403 | case ACL_CONT: | |
1da177e4 LT |
6404 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
6405 | ||
6406 | if (!conn->rx_len) { | |
6407 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
6408 | l2cap_conn_unreliable(conn, ECOMM); | |
6409 | goto drop; | |
6410 | } | |
6411 | ||
6412 | if (skb->len > conn->rx_len) { | |
6413 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 6414 | skb->len, conn->rx_len); |
1da177e4 LT |
6415 | kfree_skb(conn->rx_skb); |
6416 | conn->rx_skb = NULL; | |
6417 | conn->rx_len = 0; | |
6418 | l2cap_conn_unreliable(conn, ECOMM); | |
6419 | goto drop; | |
6420 | } | |
6421 | ||
d626f62b | 6422 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6423 | skb->len); |
1da177e4 LT |
6424 | conn->rx_len -= skb->len; |
6425 | ||
6426 | if (!conn->rx_len) { | |
6427 | /* Complete frame received */ | |
6428 | l2cap_recv_frame(conn, conn->rx_skb); | |
6429 | conn->rx_skb = NULL; | |
6430 | } | |
d73a0988 | 6431 | break; |
1da177e4 LT |
6432 | } |
6433 | ||
6434 | drop: | |
6435 | kfree_skb(skb); | |
6436 | return 0; | |
6437 | } | |
6438 | ||
aef7d97c | 6439 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 6440 | { |
23691d75 | 6441 | struct l2cap_chan *c; |
1da177e4 | 6442 | |
333055f2 | 6443 | read_lock(&chan_list_lock); |
1da177e4 | 6444 | |
23691d75 GP |
6445 | list_for_each_entry(c, &chan_list, global_l) { |
6446 | struct sock *sk = c->sk; | |
101545f6 | 6447 | |
fcb73338 AE |
6448 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
6449 | &bt_sk(sk)->src, &bt_sk(sk)->dst, | |
6450 | c->state, __le16_to_cpu(c->psm), | |
6451 | c->scid, c->dcid, c->imtu, c->omtu, | |
6452 | c->sec_level, c->mode); | |
61e1b4b7 | 6453 | } |
1da177e4 | 6454 | |
333055f2 | 6455 | read_unlock(&chan_list_lock); |
1da177e4 | 6456 | |
aef7d97c | 6457 | return 0; |
1da177e4 LT |
6458 | } |
6459 | ||
aef7d97c MH |
6460 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
6461 | { | |
6462 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
6463 | } | |
6464 | ||
6465 | static const struct file_operations l2cap_debugfs_fops = { | |
6466 | .open = l2cap_debugfs_open, | |
6467 | .read = seq_read, | |
6468 | .llseek = seq_lseek, | |
6469 | .release = single_release, | |
6470 | }; | |
6471 | ||
6472 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 6473 | |
64274518 | 6474 | int __init l2cap_init(void) |
1da177e4 LT |
6475 | { |
6476 | int err; | |
be9d1227 | 6477 | |
bb58f747 | 6478 | err = l2cap_init_sockets(); |
1da177e4 LT |
6479 | if (err < 0) |
6480 | return err; | |
6481 | ||
aef7d97c | 6482 | if (bt_debugfs) { |
2d792818 GP |
6483 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, |
6484 | NULL, &l2cap_debugfs_fops); | |
aef7d97c MH |
6485 | if (!l2cap_debugfs) |
6486 | BT_ERR("Failed to create L2CAP debug file"); | |
6487 | } | |
1da177e4 | 6488 | |
1da177e4 | 6489 | return 0; |
1da177e4 LT |
6490 | } |
6491 | ||
64274518 | 6492 | void l2cap_exit(void) |
1da177e4 | 6493 | { |
aef7d97c | 6494 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 6495 | l2cap_cleanup_sockets(); |
1da177e4 LT |
6496 | } |
6497 | ||
d1c4a17d GP |
6498 | module_param(disable_ertm, bool, 0644); |
6499 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |