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