Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
7ef9fbf0 | 39 | |
ac4b7236 | 40 | #include "smp.h" |
7024728e | 41 | #include "a2mp.h" |
7ef9fbf0 | 42 | #include "amp.h" |
1da177e4 | 43 | |
0f1bfe4e JH |
44 | #define LE_FLOWCTL_MAX_CREDITS 65535 |
45 | ||
d1de6d46 | 46 | bool disable_ertm; |
f0709e03 | 47 | |
547d1032 | 48 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD; |
a6801ca9 | 49 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS, }; |
1da177e4 | 50 | |
b5ad8b7f JB |
51 | static LIST_HEAD(chan_list); |
52 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 53 | |
f15b8ecf JH |
54 | static u16 le_max_credits = L2CAP_LE_MAX_CREDITS; |
55 | static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS; | |
56 | ||
1da177e4 | 57 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 58 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 59 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 60 | void *data); |
710f9b0a | 61 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
5e4e3972 | 62 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); |
1da177e4 | 63 | |
d660366d | 64 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2d792818 | 65 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 66 | |
4f1654e0 MH |
67 | static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type) |
68 | { | |
69 | if (hcon->type == LE_LINK) { | |
70 | if (type == ADDR_LE_DEV_PUBLIC) | |
71 | return BDADDR_LE_PUBLIC; | |
72 | else | |
73 | return BDADDR_LE_RANDOM; | |
74 | } | |
75 | ||
76 | return BDADDR_BREDR; | |
77 | } | |
78 | ||
0139418c | 79 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 80 | |
2d792818 GP |
81 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
82 | u16 cid) | |
0139418c | 83 | { |
3df91ea2 | 84 | struct l2cap_chan *c; |
3d57dc68 | 85 | |
3df91ea2 AE |
86 | list_for_each_entry(c, &conn->chan_l, list) { |
87 | if (c->dcid == cid) | |
88 | return c; | |
0139418c | 89 | } |
3df91ea2 | 90 | return NULL; |
0139418c MH |
91 | } |
92 | ||
2d792818 GP |
93 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
94 | u16 cid) | |
0139418c | 95 | { |
3df91ea2 | 96 | struct l2cap_chan *c; |
3d57dc68 | 97 | |
3df91ea2 AE |
98 | list_for_each_entry(c, &conn->chan_l, list) { |
99 | if (c->scid == cid) | |
100 | return c; | |
0139418c | 101 | } |
3df91ea2 | 102 | return NULL; |
0139418c MH |
103 | } |
104 | ||
105 | /* Find channel with given SCID. | |
ef191ade | 106 | * Returns locked channel. */ |
2d792818 GP |
107 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
108 | u16 cid) | |
0139418c | 109 | { |
48454079 | 110 | struct l2cap_chan *c; |
baa7e1fa | 111 | |
3df91ea2 | 112 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 113 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
114 | if (c) |
115 | l2cap_chan_lock(c); | |
3df91ea2 AE |
116 | mutex_unlock(&conn->chan_lock); |
117 | ||
48454079 | 118 | return c; |
0139418c MH |
119 | } |
120 | ||
b1a130b7 MM |
121 | /* Find channel with given DCID. |
122 | * Returns locked channel. | |
123 | */ | |
124 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
125 | u16 cid) | |
126 | { | |
127 | struct l2cap_chan *c; | |
128 | ||
129 | mutex_lock(&conn->chan_lock); | |
130 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
131 | if (c) | |
132 | l2cap_chan_lock(c); | |
133 | mutex_unlock(&conn->chan_lock); | |
134 | ||
135 | return c; | |
136 | } | |
137 | ||
2d792818 GP |
138 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
139 | u8 ident) | |
0139418c | 140 | { |
3df91ea2 | 141 | struct l2cap_chan *c; |
3d57dc68 | 142 | |
3df91ea2 AE |
143 | list_for_each_entry(c, &conn->chan_l, list) { |
144 | if (c->ident == ident) | |
145 | return c; | |
0139418c | 146 | } |
3df91ea2 | 147 | return NULL; |
0139418c MH |
148 | } |
149 | ||
5b155ef9 MM |
150 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
151 | u8 ident) | |
152 | { | |
153 | struct l2cap_chan *c; | |
154 | ||
155 | mutex_lock(&conn->chan_lock); | |
156 | c = __l2cap_get_chan_by_ident(conn, ident); | |
157 | if (c) | |
158 | l2cap_chan_lock(c); | |
159 | mutex_unlock(&conn->chan_lock); | |
160 | ||
161 | return c; | |
162 | } | |
163 | ||
23691d75 | 164 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 165 | { |
23691d75 | 166 | struct l2cap_chan *c; |
9e4425ff | 167 | |
23691d75 | 168 | list_for_each_entry(c, &chan_list, global_l) { |
7eafc59e | 169 | if (c->sport == psm && !bacmp(&c->src, src)) |
250938cb | 170 | return c; |
9e4425ff | 171 | } |
250938cb | 172 | return NULL; |
9e4425ff GP |
173 | } |
174 | ||
175 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
176 | { | |
73b2ec18 GP |
177 | int err; |
178 | ||
333055f2 | 179 | write_lock(&chan_list_lock); |
9e4425ff | 180 | |
23691d75 | 181 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
182 | err = -EADDRINUSE; |
183 | goto done; | |
9e4425ff GP |
184 | } |
185 | ||
73b2ec18 GP |
186 | if (psm) { |
187 | chan->psm = psm; | |
188 | chan->sport = psm; | |
189 | err = 0; | |
190 | } else { | |
191 | u16 p; | |
192 | ||
193 | err = -EINVAL; | |
194 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 195 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
196 | chan->psm = cpu_to_le16(p); |
197 | chan->sport = cpu_to_le16(p); | |
198 | err = 0; | |
199 | break; | |
200 | } | |
201 | } | |
9e4425ff | 202 | |
73b2ec18 | 203 | done: |
333055f2 | 204 | write_unlock(&chan_list_lock); |
73b2ec18 | 205 | return err; |
9e4425ff | 206 | } |
6b8d4a6a | 207 | EXPORT_SYMBOL_GPL(l2cap_add_psm); |
9e4425ff GP |
208 | |
209 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
210 | { | |
333055f2 | 211 | write_lock(&chan_list_lock); |
9e4425ff | 212 | |
14824308 JH |
213 | /* Override the defaults (which are for conn-oriented) */ |
214 | chan->omtu = L2CAP_DEFAULT_MTU; | |
215 | chan->chan_type = L2CAP_CHAN_FIXED; | |
216 | ||
9e4425ff GP |
217 | chan->scid = scid; |
218 | ||
333055f2 | 219 | write_unlock(&chan_list_lock); |
9e4425ff GP |
220 | |
221 | return 0; | |
222 | } | |
223 | ||
baa7e1fa | 224 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 225 | { |
e77af755 | 226 | u16 cid, dyn_end; |
0139418c | 227 | |
e77af755 JH |
228 | if (conn->hcon->type == LE_LINK) |
229 | dyn_end = L2CAP_CID_LE_DYN_END; | |
230 | else | |
231 | dyn_end = L2CAP_CID_DYN_END; | |
232 | ||
233 | for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) { | |
baa7e1fa | 234 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
235 | return cid; |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
f93fa273 | 241 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 242 | { |
42d2d87c | 243 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 244 | state_to_string(state)); |
badaaa00 | 245 | |
89bc500e | 246 | chan->state = state; |
53f52121 | 247 | chan->ops->state_change(chan, state, 0); |
89bc500e GP |
248 | } |
249 | ||
f8e73017 GP |
250 | static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, |
251 | int state, int err) | |
2e0052e4 | 252 | { |
f8e73017 | 253 | chan->state = state; |
53f52121 | 254 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
255 | } |
256 | ||
257 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
258 | { | |
f8e73017 | 259 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
260 | } |
261 | ||
4239d16f MM |
262 | static void __set_retrans_timer(struct l2cap_chan *chan) |
263 | { | |
264 | if (!delayed_work_pending(&chan->monitor_timer) && | |
265 | chan->retrans_timeout) { | |
266 | l2cap_set_timer(chan, &chan->retrans_timer, | |
267 | msecs_to_jiffies(chan->retrans_timeout)); | |
268 | } | |
269 | } | |
270 | ||
271 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
272 | { | |
273 | __clear_retrans_timer(chan); | |
274 | if (chan->monitor_timeout) { | |
275 | l2cap_set_timer(chan, &chan->monitor_timer, | |
276 | msecs_to_jiffies(chan->monitor_timeout)); | |
277 | } | |
278 | } | |
279 | ||
608bcc6d MM |
280 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
281 | u16 seq) | |
282 | { | |
283 | struct sk_buff *skb; | |
284 | ||
285 | skb_queue_walk(head, skb) { | |
286 | if (bt_cb(skb)->control.txseq == seq) | |
287 | return skb; | |
288 | } | |
289 | ||
290 | return NULL; | |
291 | } | |
292 | ||
3c588192 MM |
293 | /* ---- L2CAP sequence number lists ---- */ |
294 | ||
295 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
296 | * SREJ requests that are received and for frames that are to be | |
297 | * retransmitted. These seq_list functions implement a singly-linked | |
298 | * list in an array, where membership in the list can also be checked | |
299 | * in constant time. Items can also be added to the tail of the list | |
300 | * and removed from the head in constant time, without further memory | |
301 | * allocs or frees. | |
302 | */ | |
303 | ||
304 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
305 | { | |
306 | size_t alloc_size, i; | |
307 | ||
308 | /* Allocated size is a power of 2 to map sequence numbers | |
309 | * (which may be up to 14 bits) in to a smaller array that is | |
310 | * sized for the negotiated ERTM transmit windows. | |
311 | */ | |
312 | alloc_size = roundup_pow_of_two(size); | |
313 | ||
314 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
315 | if (!seq_list->list) | |
316 | return -ENOMEM; | |
317 | ||
318 | seq_list->mask = alloc_size - 1; | |
319 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
320 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
321 | for (i = 0; i < alloc_size; i++) | |
322 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
328 | { | |
329 | kfree(seq_list->list); | |
330 | } | |
331 | ||
332 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
333 | u16 seq) | |
334 | { | |
335 | /* Constant-time check for list membership */ | |
336 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
337 | } | |
338 | ||
03a0c5d6 | 339 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) |
3c588192 | 340 | { |
03a0c5d6 | 341 | u16 seq = seq_list->head; |
3c588192 MM |
342 | u16 mask = seq_list->mask; |
343 | ||
03a0c5d6 JH |
344 | seq_list->head = seq_list->list[seq & mask]; |
345 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
346 | ||
347 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
348 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
349 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 | 350 | } |
3c588192 | 351 | |
03a0c5d6 | 352 | return seq; |
3c588192 MM |
353 | } |
354 | ||
355 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
356 | { | |
f522ae36 | 357 | u16 i; |
3c588192 | 358 | |
f522ae36 GP |
359 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
360 | return; | |
361 | ||
362 | for (i = 0; i <= seq_list->mask; i++) | |
363 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
364 | ||
365 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
366 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
367 | } |
368 | ||
369 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
370 | { | |
371 | u16 mask = seq_list->mask; | |
372 | ||
373 | /* All appends happen in constant time */ | |
374 | ||
f522ae36 GP |
375 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
376 | return; | |
3c588192 | 377 | |
f522ae36 GP |
378 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
379 | seq_list->head = seq; | |
380 | else | |
381 | seq_list->list[seq_list->tail & mask] = seq; | |
382 | ||
383 | seq_list->tail = seq; | |
384 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
385 | } |
386 | ||
721c4181 | 387 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 388 | { |
721c4181 | 389 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 390 | chan_timer.work); |
3df91ea2 | 391 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
392 | int reason; |
393 | ||
e05dcc32 | 394 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 395 | |
3df91ea2 | 396 | mutex_lock(&conn->chan_lock); |
6be36555 | 397 | l2cap_chan_lock(chan); |
ab07801d | 398 | |
89bc500e | 399 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 400 | reason = ECONNREFUSED; |
89bc500e | 401 | else if (chan->state == BT_CONNECT && |
2d792818 | 402 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
403 | reason = ECONNREFUSED; |
404 | else | |
405 | reason = ETIMEDOUT; | |
406 | ||
0f852724 | 407 | l2cap_chan_close(chan, reason); |
ab07801d | 408 | |
6be36555 | 409 | l2cap_chan_unlock(chan); |
ab07801d | 410 | |
80b98027 | 411 | chan->ops->close(chan); |
3df91ea2 AE |
412 | mutex_unlock(&conn->chan_lock); |
413 | ||
371fd835 | 414 | l2cap_chan_put(chan); |
ab07801d GP |
415 | } |
416 | ||
eef1d9b6 | 417 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
418 | { |
419 | struct l2cap_chan *chan; | |
420 | ||
421 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
422 | if (!chan) | |
423 | return NULL; | |
424 | ||
c03b355e AE |
425 | mutex_init(&chan->lock); |
426 | ||
333055f2 | 427 | write_lock(&chan_list_lock); |
23691d75 | 428 | list_add(&chan->global_l, &chan_list); |
333055f2 | 429 | write_unlock(&chan_list_lock); |
23691d75 | 430 | |
721c4181 | 431 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 432 | |
89bc500e GP |
433 | chan->state = BT_OPEN; |
434 | ||
144ad330 | 435 | kref_init(&chan->kref); |
71ba0e56 | 436 | |
2827011f MM |
437 | /* This flag is cleared in l2cap_chan_ready() */ |
438 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
439 | ||
eef1d9b6 | 440 | BT_DBG("chan %p", chan); |
abc545b8 | 441 | |
48454079 GP |
442 | return chan; |
443 | } | |
6b8d4a6a | 444 | EXPORT_SYMBOL_GPL(l2cap_chan_create); |
48454079 | 445 | |
144ad330 | 446 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 447 | { |
144ad330 SS |
448 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
449 | ||
4af66c69 JK |
450 | BT_DBG("chan %p", chan); |
451 | ||
333055f2 | 452 | write_lock(&chan_list_lock); |
23691d75 | 453 | list_del(&chan->global_l); |
333055f2 | 454 | write_unlock(&chan_list_lock); |
23691d75 | 455 | |
4af66c69 | 456 | kfree(chan); |
6ff5abbf GP |
457 | } |
458 | ||
30648372 JK |
459 | void l2cap_chan_hold(struct l2cap_chan *c) |
460 | { | |
144ad330 | 461 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 462 | |
144ad330 | 463 | kref_get(&c->kref); |
30648372 JK |
464 | } |
465 | ||
466 | void l2cap_chan_put(struct l2cap_chan *c) | |
467 | { | |
144ad330 | 468 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 469 | |
144ad330 | 470 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 | 471 | } |
6b8d4a6a | 472 | EXPORT_SYMBOL_GPL(l2cap_chan_put); |
30648372 | 473 | |
bd4b1653 AE |
474 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
475 | { | |
476 | chan->fcs = L2CAP_FCS_CRC16; | |
477 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
478 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
479 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
6a5e8165 JR |
480 | chan->remote_max_tx = chan->max_tx; |
481 | chan->remote_tx_win = chan->tx_win; | |
c20f8e35 | 482 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 | 483 | chan->sec_level = BT_SECURITY_LOW; |
6a5e8165 JR |
484 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
485 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; | |
486 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; | |
487 | chan->conf_state = 0; | |
bd4b1653 AE |
488 | |
489 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
490 | } | |
6b8d4a6a | 491 | EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults); |
bd4b1653 | 492 | |
0ce43ce6 | 493 | static void l2cap_le_flowctl_init(struct l2cap_chan *chan) |
38319713 | 494 | { |
0ce43ce6 JH |
495 | chan->sdu = NULL; |
496 | chan->sdu_last_frag = NULL; | |
497 | chan->sdu_len = 0; | |
0cd75f7e | 498 | chan->tx_credits = 0; |
f15b8ecf | 499 | chan->rx_credits = le_max_credits; |
d1d79413 | 500 | chan->mps = min_t(u16, chan->imtu, le_default_mps); |
0ce43ce6 JH |
501 | |
502 | skb_queue_head_init(&chan->tx_q); | |
38319713 JH |
503 | } |
504 | ||
93c3e8f5 | 505 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 506 | { |
af05b30b | 507 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 508 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 509 | |
9f5a0d7b | 510 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 511 | |
8c1d787b | 512 | chan->conn = conn; |
0139418c | 513 | |
5491120e AE |
514 | switch (chan->chan_type) { |
515 | case L2CAP_CHAN_CONN_ORIENTED: | |
21626e62 JH |
516 | /* Alloc CID for connection-oriented socket */ |
517 | chan->scid = l2cap_alloc_cid(conn); | |
518 | if (conn->hcon->type == ACL_LINK) | |
0c1bc5c6 | 519 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
520 | break; |
521 | ||
522 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 523 | /* Connectionless socket */ |
fe4128e0 GP |
524 | chan->scid = L2CAP_CID_CONN_LESS; |
525 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 526 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
527 | break; |
528 | ||
2338a7e0 JH |
529 | case L2CAP_CHAN_FIXED: |
530 | /* Caller will set CID and CID specific MTU values */ | |
416fa752 AE |
531 | break; |
532 | ||
5491120e | 533 | default: |
0139418c | 534 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
535 | chan->scid = L2CAP_CID_SIGNALING; |
536 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 537 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
538 | } |
539 | ||
8f7975b1 AE |
540 | chan->local_id = L2CAP_BESTEFFORT_ID; |
541 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
542 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
543 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
544 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 545 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 546 | |
371fd835 | 547 | l2cap_chan_hold(chan); |
baa7e1fa | 548 | |
c16900cf JH |
549 | /* Only keep a reference for fixed channels if they requested it */ |
550 | if (chan->chan_type != L2CAP_CHAN_FIXED || | |
551 | test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) | |
552 | hci_conn_hold(conn->hcon); | |
5ee9891d | 553 | |
3df91ea2 | 554 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
555 | } |
556 | ||
466f8004 | 557 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
558 | { |
559 | mutex_lock(&conn->chan_lock); | |
560 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 561 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
562 | } |
563 | ||
466f8004 | 564 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 565 | { |
8c1d787b | 566 | struct l2cap_conn *conn = chan->conn; |
0139418c | 567 | |
c9b66675 | 568 | __clear_chan_timer(chan); |
0139418c | 569 | |
49208c9c | 570 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 571 | |
72847ce0 JH |
572 | chan->ops->teardown(chan, err); |
573 | ||
8e87d142 | 574 | if (conn) { |
56f60984 | 575 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 576 | /* Delete from channel list */ |
3df91ea2 | 577 | list_del(&chan->list); |
3d57dc68 | 578 | |
371fd835 | 579 | l2cap_chan_put(chan); |
baa7e1fa | 580 | |
8c1d787b | 581 | chan->conn = NULL; |
3cabbfda | 582 | |
c16900cf JH |
583 | /* Reference was only held for non-fixed channels or |
584 | * fixed channels that explicitly requested it using the | |
585 | * FLAG_HOLD_HCI_CONN flag. | |
586 | */ | |
587 | if (chan->chan_type != L2CAP_CHAN_FIXED || | |
588 | test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) | |
76a68ba0 | 589 | hci_conn_drop(conn->hcon); |
56f60984 AE |
590 | |
591 | if (mgr && mgr->bredr_chan == chan) | |
592 | mgr->bredr_chan = NULL; | |
0139418c MH |
593 | } |
594 | ||
419e08c1 AE |
595 | if (chan->hs_hchan) { |
596 | struct hci_chan *hs_hchan = chan->hs_hchan; | |
597 | ||
598 | BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); | |
599 | amp_disconnect_logical_link(hs_hchan); | |
600 | } | |
601 | ||
2827011f | 602 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 603 | return; |
2ead70b8 | 604 | |
ee556f66 GP |
605 | switch(chan->mode) { |
606 | case L2CAP_MODE_BASIC: | |
607 | break; | |
c13ffa62 | 608 | |
38319713 | 609 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b | 610 | skb_queue_purge(&chan->tx_q); |
38319713 JH |
611 | break; |
612 | ||
ee556f66 | 613 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
614 | __clear_retrans_timer(chan); |
615 | __clear_monitor_timer(chan); | |
616 | __clear_ack_timer(chan); | |
c13ffa62 | 617 | |
f1c6775b | 618 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 619 | |
3c588192 MM |
620 | l2cap_seq_list_free(&chan->srej_list); |
621 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
622 | |
623 | /* fall through */ | |
624 | ||
625 | case L2CAP_MODE_STREAMING: | |
626 | skb_queue_purge(&chan->tx_q); | |
627 | break; | |
c13ffa62 | 628 | } |
ee556f66 GP |
629 | |
630 | return; | |
0139418c | 631 | } |
6b8d4a6a | 632 | EXPORT_SYMBOL_GPL(l2cap_chan_del); |
0139418c | 633 | |
f3d82d0c | 634 | static void l2cap_conn_update_id_addr(struct work_struct *work) |
387a33e3 | 635 | { |
f3d82d0c JH |
636 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
637 | id_addr_update_work); | |
638 | struct hci_conn *hcon = conn->hcon; | |
387a33e3 JH |
639 | struct l2cap_chan *chan; |
640 | ||
641 | mutex_lock(&conn->chan_lock); | |
642 | ||
643 | list_for_each_entry(chan, &conn->chan_l, list) { | |
644 | l2cap_chan_lock(chan); | |
645 | bacpy(&chan->dst, &hcon->dst); | |
646 | chan->dst_type = bdaddr_type(hcon, hcon->dst_type); | |
647 | l2cap_chan_unlock(chan); | |
648 | } | |
649 | ||
650 | mutex_unlock(&conn->chan_lock); | |
651 | } | |
652 | ||
27e2d4c8 JH |
653 | static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) |
654 | { | |
655 | struct l2cap_conn *conn = chan->conn; | |
656 | struct l2cap_le_conn_rsp rsp; | |
657 | u16 result; | |
658 | ||
659 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
660 | result = L2CAP_CR_AUTHORIZATION; | |
661 | else | |
662 | result = L2CAP_CR_BAD_PSM; | |
663 | ||
664 | l2cap_state_change(chan, BT_DISCONN); | |
665 | ||
666 | rsp.dcid = cpu_to_le16(chan->scid); | |
667 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 668 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 669 | rsp.credits = cpu_to_le16(chan->rx_credits); |
27e2d4c8 JH |
670 | rsp.result = cpu_to_le16(result); |
671 | ||
672 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
673 | &rsp); | |
674 | } | |
675 | ||
791d60f7 JH |
676 | static void l2cap_chan_connect_reject(struct l2cap_chan *chan) |
677 | { | |
678 | struct l2cap_conn *conn = chan->conn; | |
679 | struct l2cap_conn_rsp rsp; | |
680 | u16 result; | |
681 | ||
682 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
683 | result = L2CAP_CR_SEC_BLOCK; | |
684 | else | |
685 | result = L2CAP_CR_BAD_PSM; | |
686 | ||
687 | l2cap_state_change(chan, BT_DISCONN); | |
688 | ||
689 | rsp.scid = cpu_to_le16(chan->dcid); | |
690 | rsp.dcid = cpu_to_le16(chan->scid); | |
691 | rsp.result = cpu_to_le16(result); | |
dcf4adbf | 692 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
791d60f7 JH |
693 | |
694 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
695 | } | |
696 | ||
0f852724 | 697 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
698 | { |
699 | struct l2cap_conn *conn = chan->conn; | |
4519de9a | 700 | |
7eafc59e | 701 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
4519de9a | 702 | |
89bc500e | 703 | switch (chan->state) { |
4519de9a | 704 | case BT_LISTEN: |
b699ec0d | 705 | chan->ops->teardown(chan, 0); |
4519de9a GP |
706 | break; |
707 | ||
708 | case BT_CONNECTED: | |
709 | case BT_CONFIG: | |
7b25c9b3 | 710 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
8d836d71 | 711 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
5e4e3972 | 712 | l2cap_send_disconn_req(chan, reason); |
4519de9a GP |
713 | } else |
714 | l2cap_chan_del(chan, reason); | |
715 | break; | |
716 | ||
717 | case BT_CONNECT2: | |
791d60f7 JH |
718 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
719 | if (conn->hcon->type == ACL_LINK) | |
720 | l2cap_chan_connect_reject(chan); | |
27e2d4c8 JH |
721 | else if (conn->hcon->type == LE_LINK) |
722 | l2cap_chan_le_connect_reject(chan); | |
4519de9a GP |
723 | } |
724 | ||
725 | l2cap_chan_del(chan, reason); | |
726 | break; | |
727 | ||
728 | case BT_CONNECT: | |
729 | case BT_DISCONN: | |
730 | l2cap_chan_del(chan, reason); | |
731 | break; | |
732 | ||
733 | default: | |
b699ec0d | 734 | chan->ops->teardown(chan, 0); |
4519de9a GP |
735 | break; |
736 | } | |
737 | } | |
6b8d4a6a | 738 | EXPORT_SYMBOL(l2cap_chan_close); |
4519de9a | 739 | |
4343478f | 740 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 741 | { |
6a974b50 MH |
742 | switch (chan->chan_type) { |
743 | case L2CAP_CHAN_RAW: | |
4343478f | 744 | switch (chan->sec_level) { |
8556edd3 | 745 | case BT_SECURITY_HIGH: |
7d513e92 | 746 | case BT_SECURITY_FIPS: |
8556edd3 JH |
747 | return HCI_AT_DEDICATED_BONDING_MITM; |
748 | case BT_SECURITY_MEDIUM: | |
749 | return HCI_AT_DEDICATED_BONDING; | |
750 | default: | |
751 | return HCI_AT_NO_BONDING; | |
752 | } | |
6a974b50 | 753 | break; |
3124b843 | 754 | case L2CAP_CHAN_CONN_LESS: |
dcf4adbf | 755 | if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) { |
3124b843 MH |
756 | if (chan->sec_level == BT_SECURITY_LOW) |
757 | chan->sec_level = BT_SECURITY_SDP; | |
758 | } | |
7d513e92 MH |
759 | if (chan->sec_level == BT_SECURITY_HIGH || |
760 | chan->sec_level == BT_SECURITY_FIPS) | |
3124b843 MH |
761 | return HCI_AT_NO_BONDING_MITM; |
762 | else | |
763 | return HCI_AT_NO_BONDING; | |
764 | break; | |
6a974b50 | 765 | case L2CAP_CHAN_CONN_ORIENTED: |
dcf4adbf | 766 | if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) { |
6a974b50 MH |
767 | if (chan->sec_level == BT_SECURITY_LOW) |
768 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 769 | |
7d513e92 MH |
770 | if (chan->sec_level == BT_SECURITY_HIGH || |
771 | chan->sec_level == BT_SECURITY_FIPS) | |
6a974b50 MH |
772 | return HCI_AT_NO_BONDING_MITM; |
773 | else | |
774 | return HCI_AT_NO_BONDING; | |
775 | } | |
776 | /* fall through */ | |
777 | default: | |
4343478f | 778 | switch (chan->sec_level) { |
00ae4af9 | 779 | case BT_SECURITY_HIGH: |
7d513e92 | 780 | case BT_SECURITY_FIPS: |
8556edd3 | 781 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 782 | case BT_SECURITY_MEDIUM: |
8556edd3 | 783 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 784 | default: |
8556edd3 | 785 | return HCI_AT_NO_BONDING; |
00ae4af9 | 786 | } |
6a974b50 | 787 | break; |
0684e5f9 | 788 | } |
8556edd3 JH |
789 | } |
790 | ||
791 | /* Service level security */ | |
e7cafc45 | 792 | int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator) |
8556edd3 | 793 | { |
8c1d787b | 794 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
795 | __u8 auth_type; |
796 | ||
a17de2fe JH |
797 | if (conn->hcon->type == LE_LINK) |
798 | return smp_conn_security(conn->hcon, chan->sec_level); | |
799 | ||
4343478f | 800 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 801 | |
e7cafc45 JH |
802 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type, |
803 | initiator); | |
79d554a6 MH |
804 | } |
805 | ||
b5ad8b7f | 806 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
807 | { |
808 | u8 id; | |
809 | ||
810 | /* Get next available identificator. | |
811 | * 1 - 128 are used by kernel. | |
812 | * 129 - 199 are reserved. | |
813 | * 200 - 254 are used by utilities like l2ping, etc. | |
814 | */ | |
815 | ||
5a54e7c8 | 816 | mutex_lock(&conn->ident_lock); |
4e8402a3 MH |
817 | |
818 | if (++conn->tx_ident > 128) | |
819 | conn->tx_ident = 1; | |
820 | ||
821 | id = conn->tx_ident; | |
822 | ||
5a54e7c8 | 823 | mutex_unlock(&conn->ident_lock); |
4e8402a3 MH |
824 | |
825 | return id; | |
826 | } | |
827 | ||
2d792818 GP |
828 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
829 | void *data) | |
4e8402a3 MH |
830 | { |
831 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 832 | u8 flags; |
4e8402a3 MH |
833 | |
834 | BT_DBG("code 0x%2.2x", code); | |
835 | ||
836 | if (!skb) | |
9a9c6a34 | 837 | return; |
4e8402a3 | 838 | |
e702112f AE |
839 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
840 | flags = ACL_START_NO_FLUSH; | |
841 | else | |
842 | flags = ACL_START; | |
843 | ||
14b12d0b | 844 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 845 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 846 | |
73d80deb LAD |
847 | hci_send_acl(conn->hchan, skb, flags); |
848 | } | |
849 | ||
02b0fbb9 MM |
850 | static bool __chan_is_moving(struct l2cap_chan *chan) |
851 | { | |
852 | return chan->move_state != L2CAP_MOVE_STABLE && | |
853 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
854 | } | |
855 | ||
73d80deb LAD |
856 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
857 | { | |
858 | struct hci_conn *hcon = chan->conn->hcon; | |
859 | u16 flags; | |
860 | ||
861 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 862 | skb->priority); |
73d80deb | 863 | |
d5f8a75d MM |
864 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
865 | if (chan->hs_hchan) | |
866 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
867 | else | |
868 | kfree_skb(skb); | |
869 | ||
870 | return; | |
871 | } | |
872 | ||
73d80deb | 873 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
2d792818 | 874 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
875 | flags = ACL_START_NO_FLUSH; |
876 | else | |
877 | flags = ACL_START; | |
14b12d0b | 878 | |
73d80deb LAD |
879 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
880 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
881 | } |
882 | ||
b76bbd66 MM |
883 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
884 | { | |
885 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
886 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
887 | ||
888 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
889 | /* S-Frame */ | |
890 | control->sframe = 1; | |
891 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
892 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
893 | ||
894 | control->sar = 0; | |
895 | control->txseq = 0; | |
896 | } else { | |
897 | /* I-Frame */ | |
898 | control->sframe = 0; | |
899 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
900 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
901 | ||
902 | control->poll = 0; | |
903 | control->super = 0; | |
904 | } | |
905 | } | |
906 | ||
b76bbd66 MM |
907 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
908 | { | |
909 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
910 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
911 | ||
912 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
913 | /* S-Frame */ | |
914 | control->sframe = 1; | |
915 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
916 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
917 | ||
918 | control->sar = 0; | |
919 | control->txseq = 0; | |
920 | } else { | |
921 | /* I-Frame */ | |
922 | control->sframe = 0; | |
923 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
924 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
925 | ||
926 | control->poll = 0; | |
927 | control->super = 0; | |
928 | } | |
929 | } | |
930 | ||
931 | static inline void __unpack_control(struct l2cap_chan *chan, | |
932 | struct sk_buff *skb) | |
933 | { | |
934 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
935 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
936 | &bt_cb(skb)->control); | |
cec8ab6e | 937 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
938 | } else { |
939 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
940 | &bt_cb(skb)->control); | |
cec8ab6e | 941 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
942 | } |
943 | } | |
944 | ||
b5c6aaed MM |
945 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
946 | { | |
947 | u32 packed; | |
948 | ||
949 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
950 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
951 | ||
952 | if (control->sframe) { | |
953 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
954 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
955 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
956 | } else { | |
957 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
958 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
959 | } | |
960 | ||
961 | return packed; | |
962 | } | |
963 | ||
964 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
965 | { | |
966 | u16 packed; | |
967 | ||
968 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
969 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
970 | ||
971 | if (control->sframe) { | |
972 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
973 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
974 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
975 | } else { | |
976 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
977 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
978 | } | |
979 | ||
980 | return packed; | |
981 | } | |
982 | ||
b76bbd66 MM |
983 | static inline void __pack_control(struct l2cap_chan *chan, |
984 | struct l2cap_ctrl *control, | |
985 | struct sk_buff *skb) | |
986 | { | |
987 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
988 | put_unaligned_le32(__pack_extended_control(control), | |
989 | skb->data + L2CAP_HDR_SIZE); | |
990 | } else { | |
991 | put_unaligned_le16(__pack_enhanced_control(control), | |
992 | skb->data + L2CAP_HDR_SIZE); | |
993 | } | |
994 | } | |
995 | ||
ba7aa64f GP |
996 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
997 | { | |
998 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
999 | return L2CAP_EXT_HDR_SIZE; | |
1000 | else | |
1001 | return L2CAP_ENH_HDR_SIZE; | |
1002 | } | |
1003 | ||
a67d7f6f MM |
1004 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
1005 | u32 control) | |
b5c6aaed MM |
1006 | { |
1007 | struct sk_buff *skb; | |
1008 | struct l2cap_hdr *lh; | |
ba7aa64f | 1009 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
1010 | |
1011 | if (chan->fcs == L2CAP_FCS_CRC16) | |
1012 | hlen += L2CAP_FCS_SIZE; | |
1013 | ||
a67d7f6f | 1014 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 1015 | |
b5c6aaed | 1016 | if (!skb) |
a67d7f6f | 1017 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
1018 | |
1019 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1020 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
1021 | lh->cid = cpu_to_le16(chan->dcid); | |
1022 | ||
a67d7f6f MM |
1023 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1024 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
1025 | else | |
1026 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
1027 | |
1028 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 1029 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
1030 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
1031 | } | |
1032 | ||
1033 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
1034 | return skb; |
1035 | } | |
1036 | ||
1037 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
1038 | struct l2cap_ctrl *control) | |
1039 | { | |
1040 | struct sk_buff *skb; | |
1041 | u32 control_field; | |
1042 | ||
1043 | BT_DBG("chan %p, control %p", chan, control); | |
1044 | ||
1045 | if (!control->sframe) | |
1046 | return; | |
1047 | ||
b99e13ad MM |
1048 | if (__chan_is_moving(chan)) |
1049 | return; | |
1050 | ||
a67d7f6f MM |
1051 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
1052 | !control->poll) | |
1053 | control->final = 1; | |
1054 | ||
1055 | if (control->super == L2CAP_SUPER_RR) | |
1056 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
1057 | else if (control->super == L2CAP_SUPER_RNR) | |
1058 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
1059 | ||
1060 | if (control->super != L2CAP_SUPER_SREJ) { | |
1061 | chan->last_acked_seq = control->reqseq; | |
1062 | __clear_ack_timer(chan); | |
1063 | } | |
1064 | ||
1065 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
1066 | control->final, control->poll, control->super); | |
1067 | ||
1068 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1069 | control_field = __pack_extended_control(control); | |
1070 | else | |
1071 | control_field = __pack_enhanced_control(control); | |
1072 | ||
1073 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
1074 | if (!IS_ERR(skb)) | |
1075 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
1076 | } |
1077 | ||
c9e3d5e0 | 1078 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 1079 | { |
c9e3d5e0 MM |
1080 | struct l2cap_ctrl control; |
1081 | ||
1082 | BT_DBG("chan %p, poll %d", chan, poll); | |
1083 | ||
1084 | memset(&control, 0, sizeof(control)); | |
1085 | control.sframe = 1; | |
1086 | control.poll = poll; | |
1087 | ||
1088 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
1089 | control.super = L2CAP_SUPER_RNR; | |
1090 | else | |
1091 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1092 | |
c9e3d5e0 MM |
1093 | control.reqseq = chan->buffer_seq; |
1094 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1095 | } |
1096 | ||
b4450035 | 1097 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1098 | { |
5ff6f34d JH |
1099 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
1100 | return true; | |
1101 | ||
c1360a1c | 1102 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1103 | } |
1104 | ||
1df7b17a | 1105 | static bool __amp_capable(struct l2cap_chan *chan) |
80d58d0b | 1106 | { |
1df7b17a | 1107 | struct l2cap_conn *conn = chan->conn; |
80d58d0b | 1108 | struct hci_dev *hdev; |
1df7b17a MH |
1109 | bool amp_available = false; |
1110 | ||
1111 | if (!conn->hs_enabled) | |
1112 | return false; | |
1113 | ||
1114 | if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP)) | |
1115 | return false; | |
80d58d0b MH |
1116 | |
1117 | read_lock(&hci_dev_list_lock); | |
1df7b17a | 1118 | list_for_each_entry(hdev, &hci_dev_list, list) { |
80d58d0b | 1119 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1df7b17a MH |
1120 | test_bit(HCI_UP, &hdev->flags)) { |
1121 | amp_available = true; | |
1122 | break; | |
1123 | } | |
1124 | } | |
80d58d0b MH |
1125 | read_unlock(&hci_dev_list_lock); |
1126 | ||
1df7b17a MH |
1127 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1128 | return amp_available; | |
848566b3 MH |
1129 | |
1130 | return false; | |
93c3e8f5 AE |
1131 | } |
1132 | ||
5ce66b59 AE |
1133 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1134 | { | |
1135 | /* Check EFS parameters */ | |
1136 | return true; | |
1137 | } | |
1138 | ||
2766be48 | 1139 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1140 | { |
1141 | struct l2cap_conn *conn = chan->conn; | |
1142 | struct l2cap_conn_req req; | |
1143 | ||
1144 | req.scid = cpu_to_le16(chan->scid); | |
1145 | req.psm = chan->psm; | |
1146 | ||
1147 | chan->ident = l2cap_get_ident(conn); | |
1148 | ||
1149 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1150 | ||
1151 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1152 | } | |
1153 | ||
8eb200bd MM |
1154 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1155 | { | |
1156 | struct l2cap_create_chan_req req; | |
1157 | req.scid = cpu_to_le16(chan->scid); | |
1158 | req.psm = chan->psm; | |
1159 | req.amp_id = amp_id; | |
1160 | ||
1161 | chan->ident = l2cap_get_ident(chan->conn); | |
1162 | ||
1163 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1164 | sizeof(req), &req); | |
1165 | } | |
1166 | ||
02b0fbb9 MM |
1167 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1168 | { | |
1169 | struct sk_buff *skb; | |
1170 | ||
1171 | BT_DBG("chan %p", chan); | |
1172 | ||
1173 | if (chan->mode != L2CAP_MODE_ERTM) | |
1174 | return; | |
1175 | ||
1176 | __clear_retrans_timer(chan); | |
1177 | __clear_monitor_timer(chan); | |
1178 | __clear_ack_timer(chan); | |
1179 | ||
1180 | chan->retry_count = 0; | |
1181 | skb_queue_walk(&chan->tx_q, skb) { | |
1182 | if (bt_cb(skb)->control.retries) | |
1183 | bt_cb(skb)->control.retries = 1; | |
1184 | else | |
1185 | break; | |
1186 | } | |
1187 | ||
1188 | chan->expected_tx_seq = chan->buffer_seq; | |
1189 | ||
1190 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1191 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1192 | l2cap_seq_list_clear(&chan->retrans_list); | |
1193 | l2cap_seq_list_clear(&chan->srej_list); | |
1194 | skb_queue_purge(&chan->srej_q); | |
1195 | ||
1196 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1197 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1198 | ||
1199 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1200 | } | |
1201 | ||
5f3847a4 MM |
1202 | static void l2cap_move_done(struct l2cap_chan *chan) |
1203 | { | |
1204 | u8 move_role = chan->move_role; | |
1205 | BT_DBG("chan %p", chan); | |
1206 | ||
1207 | chan->move_state = L2CAP_MOVE_STABLE; | |
1208 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1209 | ||
1210 | if (chan->mode != L2CAP_MODE_ERTM) | |
1211 | return; | |
1212 | ||
1213 | switch (move_role) { | |
1214 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1215 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1216 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1217 | break; | |
1218 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1219 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1220 | break; | |
1221 | } | |
1222 | } | |
1223 | ||
9f0caeb1 VCG |
1224 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1225 | { | |
2827011f | 1226 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1227 | chan->conf_state = 0; |
1228 | __clear_chan_timer(chan); | |
1229 | ||
0ce43ce6 JH |
1230 | if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) |
1231 | chan->ops->suspend(chan); | |
177f8f2b | 1232 | |
54a59aa2 | 1233 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1234 | |
fd83e2c2 | 1235 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1236 | } |
1237 | ||
f1496dee JH |
1238 | static void l2cap_le_connect(struct l2cap_chan *chan) |
1239 | { | |
1240 | struct l2cap_conn *conn = chan->conn; | |
1241 | struct l2cap_le_conn_req req; | |
1242 | ||
595177f3 JH |
1243 | if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags)) |
1244 | return; | |
1245 | ||
f1496dee JH |
1246 | req.psm = chan->psm; |
1247 | req.scid = cpu_to_le16(chan->scid); | |
1248 | req.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 1249 | req.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 1250 | req.credits = cpu_to_le16(chan->rx_credits); |
f1496dee JH |
1251 | |
1252 | chan->ident = l2cap_get_ident(conn); | |
1253 | ||
1254 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, | |
1255 | sizeof(req), &req); | |
1256 | } | |
1257 | ||
1258 | static void l2cap_le_start(struct l2cap_chan *chan) | |
1259 | { | |
1260 | struct l2cap_conn *conn = chan->conn; | |
1261 | ||
1262 | if (!smp_conn_security(conn->hcon, chan->sec_level)) | |
1263 | return; | |
1264 | ||
1265 | if (!chan->psm) { | |
1266 | l2cap_chan_ready(chan); | |
1267 | return; | |
1268 | } | |
1269 | ||
1270 | if (chan->state == BT_CONNECT) | |
1271 | l2cap_le_connect(chan); | |
1272 | } | |
1273 | ||
93c3e8f5 AE |
1274 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1275 | { | |
1276 | if (__amp_capable(chan)) { | |
1277 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1278 | a2mp_discover_amp(chan); | |
f1496dee JH |
1279 | } else if (chan->conn->hcon->type == LE_LINK) { |
1280 | l2cap_le_start(chan); | |
93c3e8f5 AE |
1281 | } else { |
1282 | l2cap_send_conn_req(chan); | |
1283 | } | |
1284 | } | |
1285 | ||
aeaeb4bb JH |
1286 | static void l2cap_request_info(struct l2cap_conn *conn) |
1287 | { | |
1288 | struct l2cap_info_req req; | |
1289 | ||
1290 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) | |
1291 | return; | |
1292 | ||
1293 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1294 | ||
1295 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1296 | conn->info_ident = l2cap_get_ident(conn); | |
1297 | ||
1298 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); | |
1299 | ||
1300 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, | |
1301 | sizeof(req), &req); | |
1302 | } | |
1303 | ||
fc7f8a7e | 1304 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1305 | { |
8c1d787b | 1306 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1307 | |
9f0caeb1 | 1308 | if (conn->hcon->type == LE_LINK) { |
96ac34fb | 1309 | l2cap_le_start(chan); |
9f0caeb1 VCG |
1310 | return; |
1311 | } | |
1312 | ||
aeaeb4bb JH |
1313 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) { |
1314 | l2cap_request_info(conn); | |
1315 | return; | |
1316 | } | |
79d554a6 | 1317 | |
aeaeb4bb JH |
1318 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1319 | return; | |
79d554a6 | 1320 | |
aeaeb4bb JH |
1321 | if (l2cap_chan_check_security(chan, true) && |
1322 | __l2cap_no_conn_pending(chan)) | |
1323 | l2cap_start_connection(chan); | |
79d554a6 MH |
1324 | } |
1325 | ||
cf6c2c0b GP |
1326 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1327 | { | |
1328 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1329 | if (!disable_ertm) |
cf6c2c0b GP |
1330 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1331 | ||
1332 | switch (mode) { | |
1333 | case L2CAP_MODE_ERTM: | |
1334 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1335 | case L2CAP_MODE_STREAMING: | |
1336 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1337 | default: | |
1338 | return 0x00; | |
1339 | } | |
1340 | } | |
1341 | ||
5e4e3972 | 1342 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1343 | { |
5e4e3972 | 1344 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1345 | struct l2cap_disconn_req req; |
1346 | ||
c13ffa62 GP |
1347 | if (!conn) |
1348 | return; | |
1349 | ||
aad3d0e3 | 1350 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1351 | __clear_retrans_timer(chan); |
1352 | __clear_monitor_timer(chan); | |
1353 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1354 | } |
1355 | ||
2338a7e0 | 1356 | if (chan->scid == L2CAP_CID_A2MP) { |
d117773c | 1357 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1358 | return; |
1359 | } | |
1360 | ||
fe4128e0 GP |
1361 | req.dcid = cpu_to_le16(chan->dcid); |
1362 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1363 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1364 | sizeof(req), &req); | |
c13ffa62 | 1365 | |
f8e73017 | 1366 | l2cap_state_change_and_error(chan, BT_DISCONN, err); |
22121fc9 GP |
1367 | } |
1368 | ||
1da177e4 | 1369 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1370 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1371 | { | |
3df91ea2 | 1372 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1373 | |
1374 | BT_DBG("conn %p", conn); | |
1375 | ||
3df91ea2 | 1376 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1377 | |
3df91ea2 | 1378 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6be36555 | 1379 | l2cap_chan_lock(chan); |
4e8402a3 | 1380 | |
715ec005 | 1381 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
aeaeb4bb | 1382 | l2cap_chan_ready(chan); |
6be36555 | 1383 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1384 | continue; |
1385 | } | |
1386 | ||
89bc500e | 1387 | if (chan->state == BT_CONNECT) { |
e7cafc45 | 1388 | if (!l2cap_chan_check_security(chan, true) || |
2d792818 | 1389 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1390 | l2cap_chan_unlock(chan); |
47731de7 GP |
1391 | continue; |
1392 | } | |
79d554a6 | 1393 | |
c1360a1c | 1394 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1395 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1396 | &chan->conf_state)) { |
89bc500e | 1397 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1398 | l2cap_chan_unlock(chan); |
47731de7 | 1399 | continue; |
b1235d79 | 1400 | } |
47731de7 | 1401 | |
93c3e8f5 | 1402 | l2cap_start_connection(chan); |
47731de7 | 1403 | |
89bc500e | 1404 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1405 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1406 | char buf[128]; |
fe4128e0 GP |
1407 | rsp.scid = cpu_to_le16(chan->dcid); |
1408 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1409 | |
e7cafc45 | 1410 | if (l2cap_chan_check_security(chan, false)) { |
bdc25783 | 1411 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
dcf4adbf JP |
1412 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1413 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1414 | chan->ops->defer(chan); |
f66dc81f MH |
1415 | |
1416 | } else { | |
acdcabf5 | 1417 | l2cap_state_change(chan, BT_CONFIG); |
dcf4adbf JP |
1418 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1419 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1420 | } |
79d554a6 | 1421 | } else { |
dcf4adbf JP |
1422 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1423 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1424 | } |
1425 | ||
fc7f8a7e | 1426 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1427 | sizeof(rsp), &rsp); |
e9aeb2dd | 1428 | |
c1360a1c | 1429 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1430 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1431 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1432 | continue; |
1433 | } | |
1434 | ||
c1360a1c | 1435 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1436 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1437 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1438 | chan->num_conf_req++; |
4e8402a3 MH |
1439 | } |
1440 | ||
6be36555 | 1441 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1442 | } |
1443 | ||
3df91ea2 | 1444 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1445 | } |
1446 | ||
b62f328b VT |
1447 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) |
1448 | { | |
cc8dba2b | 1449 | struct hci_conn *hcon = conn->hcon; |
dcc36c16 | 1450 | struct hci_dev *hdev = hcon->hdev; |
b62f328b | 1451 | |
e760ec12 | 1452 | BT_DBG("%s conn %p", hdev->name, conn); |
b62f328b | 1453 | |
e760ec12 JH |
1454 | /* For outgoing pairing which doesn't necessarily have an |
1455 | * associated socket (e.g. mgmt_pair_device). | |
1456 | */ | |
1457 | if (hcon->out) | |
1458 | smp_conn_security(hcon, hcon->pending_sec_level); | |
cc8dba2b | 1459 | |
80afeb6c MH |
1460 | /* For LE slave connections, make sure the connection interval |
1461 | * is in the range of the minium and maximum interval that has | |
1462 | * been configured for this connection. If not, then trigger | |
1463 | * the connection update procedure. | |
1464 | */ | |
40bef302 | 1465 | if (hcon->role == HCI_ROLE_SLAVE && |
80afeb6c MH |
1466 | (hcon->le_conn_interval < hcon->le_conn_min_interval || |
1467 | hcon->le_conn_interval > hcon->le_conn_max_interval)) { | |
1468 | struct l2cap_conn_param_update_req req; | |
1469 | ||
1470 | req.min = cpu_to_le16(hcon->le_conn_min_interval); | |
1471 | req.max = cpu_to_le16(hcon->le_conn_max_interval); | |
1472 | req.latency = cpu_to_le16(hcon->le_conn_latency); | |
1473 | req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout); | |
1474 | ||
1475 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
1476 | L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req); | |
1477 | } | |
b62f328b VT |
1478 | } |
1479 | ||
4e8402a3 MH |
1480 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1481 | { | |
48454079 | 1482 | struct l2cap_chan *chan; |
cc110922 | 1483 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1484 | |
79d554a6 | 1485 | BT_DBG("conn %p", conn); |
4e8402a3 | 1486 | |
aeaeb4bb JH |
1487 | if (hcon->type == ACL_LINK) |
1488 | l2cap_request_info(conn); | |
1489 | ||
e760ec12 JH |
1490 | mutex_lock(&conn->chan_lock); |
1491 | ||
3df91ea2 | 1492 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1493 | |
6be36555 | 1494 | l2cap_chan_lock(chan); |
4e8402a3 | 1495 | |
2338a7e0 | 1496 | if (chan->scid == L2CAP_CID_A2MP) { |
416fa752 AE |
1497 | l2cap_chan_unlock(chan); |
1498 | continue; | |
1499 | } | |
1500 | ||
cc110922 | 1501 | if (hcon->type == LE_LINK) { |
f1496dee | 1502 | l2cap_le_start(chan); |
63128451 | 1503 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
aeaeb4bb JH |
1504 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
1505 | l2cap_chan_ready(chan); | |
1c244f79 | 1506 | } else if (chan->state == BT_CONNECT) { |
fc7f8a7e | 1507 | l2cap_do_start(chan); |
1c244f79 | 1508 | } |
4e8402a3 | 1509 | |
6be36555 | 1510 | l2cap_chan_unlock(chan); |
4e8402a3 | 1511 | } |
79d554a6 | 1512 | |
3df91ea2 | 1513 | mutex_unlock(&conn->chan_lock); |
61a939c6 | 1514 | |
79a05727 JH |
1515 | if (hcon->type == LE_LINK) |
1516 | l2cap_le_conn_ready(conn); | |
1517 | ||
61a939c6 | 1518 | queue_work(hcon->hdev->workqueue, &conn->pending_rx_work); |
4e8402a3 MH |
1519 | } |
1520 | ||
1521 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1522 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1523 | { | |
48454079 | 1524 | struct l2cap_chan *chan; |
4e8402a3 MH |
1525 | |
1526 | BT_DBG("conn %p", conn); | |
1527 | ||
3df91ea2 | 1528 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1529 | |
3df91ea2 | 1530 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1531 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1532 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1533 | } |
1534 | ||
3df91ea2 | 1535 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1536 | } |
1537 | ||
f878fcad | 1538 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1539 | { |
f878fcad | 1540 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1541 | info_timer.work); |
4e8402a3 | 1542 | |
984947dc | 1543 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1544 | conn->info_ident = 0; |
984947dc | 1545 | |
4e8402a3 MH |
1546 | l2cap_conn_start(conn); |
1547 | } | |
1548 | ||
2c8e1411 DH |
1549 | /* |
1550 | * l2cap_user | |
1551 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1552 | * callback is called during registration. The ->remove callback is called | |
1553 | * during unregistration. | |
1554 | * An l2cap_user object can either be explicitly unregistered or when the | |
1555 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1556 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1557 | * External modules must own a reference to the l2cap_conn object if they intend | |
1558 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1559 | * any time if they don't. | |
1560 | */ | |
1561 | ||
1562 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1563 | { | |
1564 | struct hci_dev *hdev = conn->hcon->hdev; | |
1565 | int ret; | |
1566 | ||
1567 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1568 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1569 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1570 | * relies on the parent hci_conn object to be locked. This itself relies | |
1571 | * on the hci_dev object to be locked. So we must lock the hci device | |
1572 | * here, too. */ | |
1573 | ||
1574 | hci_dev_lock(hdev); | |
1575 | ||
1576 | if (user->list.next || user->list.prev) { | |
1577 | ret = -EINVAL; | |
1578 | goto out_unlock; | |
1579 | } | |
1580 | ||
1581 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1582 | if (!conn->hchan) { | |
1583 | ret = -ENODEV; | |
1584 | goto out_unlock; | |
1585 | } | |
1586 | ||
1587 | ret = user->probe(conn, user); | |
1588 | if (ret) | |
1589 | goto out_unlock; | |
1590 | ||
1591 | list_add(&user->list, &conn->users); | |
1592 | ret = 0; | |
1593 | ||
1594 | out_unlock: | |
1595 | hci_dev_unlock(hdev); | |
1596 | return ret; | |
1597 | } | |
1598 | EXPORT_SYMBOL(l2cap_register_user); | |
1599 | ||
1600 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1601 | { | |
1602 | struct hci_dev *hdev = conn->hcon->hdev; | |
1603 | ||
1604 | hci_dev_lock(hdev); | |
1605 | ||
1606 | if (!user->list.next || !user->list.prev) | |
1607 | goto out_unlock; | |
1608 | ||
1609 | list_del(&user->list); | |
1610 | user->list.next = NULL; | |
1611 | user->list.prev = NULL; | |
1612 | user->remove(conn, user); | |
1613 | ||
1614 | out_unlock: | |
1615 | hci_dev_unlock(hdev); | |
1616 | } | |
1617 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1618 | ||
1619 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1620 | { | |
1621 | struct l2cap_user *user; | |
1622 | ||
1623 | while (!list_empty(&conn->users)) { | |
1624 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1625 | list_del(&user->list); | |
1626 | user->list.next = NULL; | |
1627 | user->list.prev = NULL; | |
1628 | user->remove(conn, user); | |
1629 | } | |
1630 | } | |
1631 | ||
5d3de7df VCG |
1632 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1633 | { | |
1634 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1635 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1636 | |
1637 | if (!conn) | |
1638 | return; | |
1639 | ||
1640 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1641 | ||
1642 | kfree_skb(conn->rx_skb); | |
1643 | ||
61a939c6 | 1644 | skb_queue_purge(&conn->pending_rx); |
7ab56c3a JT |
1645 | |
1646 | /* We can not call flush_work(&conn->pending_rx_work) here since we | |
1647 | * might block if we are running on a worker from the same workqueue | |
1648 | * pending_rx_work is waiting on. | |
1649 | */ | |
1650 | if (work_pending(&conn->pending_rx_work)) | |
1651 | cancel_work_sync(&conn->pending_rx_work); | |
61a939c6 | 1652 | |
f3d82d0c JH |
1653 | if (work_pending(&conn->id_addr_update_work)) |
1654 | cancel_work_sync(&conn->id_addr_update_work); | |
1655 | ||
2c8e1411 DH |
1656 | l2cap_unregister_all_users(conn); |
1657 | ||
e31fb860 JH |
1658 | /* Force the connection to be immediately dropped */ |
1659 | hcon->disc_timeout = 0; | |
1660 | ||
3df91ea2 AE |
1661 | mutex_lock(&conn->chan_lock); |
1662 | ||
5d3de7df VCG |
1663 | /* Kill channels */ |
1664 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1665 | l2cap_chan_hold(chan); |
6be36555 AE |
1666 | l2cap_chan_lock(chan); |
1667 | ||
5d3de7df | 1668 | l2cap_chan_del(chan, err); |
6be36555 AE |
1669 | |
1670 | l2cap_chan_unlock(chan); | |
1671 | ||
80b98027 | 1672 | chan->ops->close(chan); |
61d6ef3e | 1673 | l2cap_chan_put(chan); |
5d3de7df VCG |
1674 | } |
1675 | ||
3df91ea2 AE |
1676 | mutex_unlock(&conn->chan_lock); |
1677 | ||
73d80deb LAD |
1678 | hci_chan_del(conn->hchan); |
1679 | ||
5d3de7df | 1680 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1681 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1682 | |
5d3de7df | 1683 | hcon->l2cap_data = NULL; |
9c903e37 DH |
1684 | conn->hchan = NULL; |
1685 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1686 | } |
1687 | ||
9c903e37 DH |
1688 | static void l2cap_conn_free(struct kref *ref) |
1689 | { | |
1690 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1691 | ||
1692 | hci_conn_put(conn->hcon); | |
1693 | kfree(conn); | |
1694 | } | |
1695 | ||
51bb8457 | 1696 | struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn) |
9c903e37 DH |
1697 | { |
1698 | kref_get(&conn->ref); | |
51bb8457 | 1699 | return conn; |
9c903e37 DH |
1700 | } |
1701 | EXPORT_SYMBOL(l2cap_conn_get); | |
1702 | ||
1703 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1704 | { | |
1705 | kref_put(&conn->ref, l2cap_conn_free); | |
1706 | } | |
1707 | EXPORT_SYMBOL(l2cap_conn_put); | |
1708 | ||
1da177e4 | 1709 | /* ---- Socket interface ---- */ |
1da177e4 | 1710 | |
c2287681 | 1711 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1712 | * Returns closest match. |
1713 | */ | |
c2287681 IY |
1714 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1715 | bdaddr_t *src, | |
bf20fd4e JH |
1716 | bdaddr_t *dst, |
1717 | u8 link_type) | |
1da177e4 | 1718 | { |
23691d75 | 1719 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1720 | |
23691d75 | 1721 | read_lock(&chan_list_lock); |
e0f0cb56 | 1722 | |
23691d75 | 1723 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1724 | if (state && c->state != state) |
1da177e4 LT |
1725 | continue; |
1726 | ||
bf20fd4e JH |
1727 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1728 | continue; | |
1729 | ||
1730 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
1731 | continue; | |
1732 | ||
23691d75 | 1733 | if (c->psm == psm) { |
c2287681 IY |
1734 | int src_match, dst_match; |
1735 | int src_any, dst_any; | |
1736 | ||
1da177e4 | 1737 | /* Exact match. */ |
7eafc59e MH |
1738 | src_match = !bacmp(&c->src, src); |
1739 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1740 | if (src_match && dst_match) { |
a24cce14 | 1741 | l2cap_chan_hold(c); |
a7567b20 | 1742 | read_unlock(&chan_list_lock); |
23691d75 GP |
1743 | return c; |
1744 | } | |
1da177e4 LT |
1745 | |
1746 | /* Closest match */ | |
7eafc59e MH |
1747 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1748 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1749 | if ((src_match && dst_any) || (src_any && dst_match) || |
1750 | (src_any && dst_any)) | |
23691d75 | 1751 | c1 = c; |
1da177e4 LT |
1752 | } |
1753 | } | |
1da177e4 | 1754 | |
a24cce14 JH |
1755 | if (c1) |
1756 | l2cap_chan_hold(c1); | |
1757 | ||
23691d75 | 1758 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1759 | |
23691d75 | 1760 | return c1; |
1da177e4 LT |
1761 | } |
1762 | ||
721c4181 | 1763 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1764 | { |
721c4181 | 1765 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1766 | monitor_timer.work); |
e90bac06 | 1767 | |
525cd185 | 1768 | BT_DBG("chan %p", chan); |
0e98958d | 1769 | |
6be36555 AE |
1770 | l2cap_chan_lock(chan); |
1771 | ||
80909e04 | 1772 | if (!chan->conn) { |
6be36555 | 1773 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1774 | l2cap_chan_put(chan); |
e90bac06 GP |
1775 | return; |
1776 | } | |
1777 | ||
401bb1f7 | 1778 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1779 | |
6be36555 | 1780 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1781 | l2cap_chan_put(chan); |
e90bac06 GP |
1782 | } |
1783 | ||
721c4181 | 1784 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1785 | { |
721c4181 | 1786 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1787 | retrans_timer.work); |
e90bac06 | 1788 | |
49208c9c | 1789 | BT_DBG("chan %p", chan); |
0e98958d | 1790 | |
6be36555 AE |
1791 | l2cap_chan_lock(chan); |
1792 | ||
80909e04 MM |
1793 | if (!chan->conn) { |
1794 | l2cap_chan_unlock(chan); | |
1795 | l2cap_chan_put(chan); | |
1796 | return; | |
1797 | } | |
6be36555 | 1798 | |
401bb1f7 | 1799 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1800 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1801 | l2cap_chan_put(chan); |
e90bac06 GP |
1802 | } |
1803 | ||
d660366d GP |
1804 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1805 | struct sk_buff_head *skbs) | |
6840ed07 | 1806 | { |
ccbb84af | 1807 | struct sk_buff *skb; |
3733937d | 1808 | struct l2cap_ctrl *control; |
6840ed07 | 1809 | |
3733937d MM |
1810 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1811 | ||
b99e13ad MM |
1812 | if (__chan_is_moving(chan)) |
1813 | return; | |
1814 | ||
3733937d MM |
1815 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1816 | ||
1817 | while (!skb_queue_empty(&chan->tx_q)) { | |
1818 | ||
1819 | skb = skb_dequeue(&chan->tx_q); | |
1820 | ||
1821 | bt_cb(skb)->control.retries = 1; | |
1822 | control = &bt_cb(skb)->control; | |
1823 | ||
1824 | control->reqseq = 0; | |
1825 | control->txseq = chan->next_tx_seq; | |
1826 | ||
1827 | __pack_control(chan, control, skb); | |
6840ed07 | 1828 | |
47d1ec61 | 1829 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1830 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1831 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1832 | } |
1833 | ||
4343478f | 1834 | l2cap_do_send(chan, skb); |
6840ed07 | 1835 | |
b4400672 | 1836 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1837 | |
836be934 | 1838 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1839 | chan->frames_sent++; |
6840ed07 | 1840 | } |
6840ed07 GP |
1841 | } |
1842 | ||
67c9e840 | 1843 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1844 | { |
1845 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1846 | struct l2cap_ctrl *control; |
1847 | int sent = 0; | |
1848 | ||
1849 | BT_DBG("chan %p", chan); | |
1c2acffb | 1850 | |
89bc500e | 1851 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1852 | return -ENOTCONN; |
e90bac06 | 1853 | |
94122bbe MM |
1854 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1855 | return 0; | |
1856 | ||
b99e13ad MM |
1857 | if (__chan_is_moving(chan)) |
1858 | return 0; | |
1859 | ||
18a48e76 MM |
1860 | while (chan->tx_send_head && |
1861 | chan->unacked_frames < chan->remote_tx_win && | |
1862 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1863 | |
18a48e76 | 1864 | skb = chan->tx_send_head; |
e90bac06 | 1865 | |
18a48e76 MM |
1866 | bt_cb(skb)->control.retries = 1; |
1867 | control = &bt_cb(skb)->control; | |
95ffa978 | 1868 | |
e2ab4353 | 1869 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1870 | control->final = 1; |
e2ab4353 | 1871 | |
18a48e76 MM |
1872 | control->reqseq = chan->buffer_seq; |
1873 | chan->last_acked_seq = chan->buffer_seq; | |
1874 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1875 | |
18a48e76 | 1876 | __pack_control(chan, control, skb); |
e90bac06 | 1877 | |
47d1ec61 | 1878 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1879 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1880 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1881 | } |
1882 | ||
18a48e76 MM |
1883 | /* Clone after data has been modified. Data is assumed to be |
1884 | read-only (for locking purposes) on cloned sk_buffs. | |
1885 | */ | |
1886 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1887 | |
18a48e76 MM |
1888 | if (!tx_skb) |
1889 | break; | |
1c2acffb | 1890 | |
18a48e76 | 1891 | __set_retrans_timer(chan); |
836be934 AE |
1892 | |
1893 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1894 | chan->unacked_frames++; |
6a026610 | 1895 | chan->frames_sent++; |
18a48e76 | 1896 | sent++; |
1c2acffb | 1897 | |
58d35f87 GP |
1898 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1899 | chan->tx_send_head = NULL; | |
1c2acffb | 1900 | else |
58d35f87 | 1901 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1902 | |
1903 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1904 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1905 | } |
1906 | ||
b4400672 AE |
1907 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1908 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1909 | |
1910 | return sent; | |
9e917af1 GP |
1911 | } |
1912 | ||
e1fbd4c1 MM |
1913 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1914 | { | |
1915 | struct l2cap_ctrl control; | |
1916 | struct sk_buff *skb; | |
1917 | struct sk_buff *tx_skb; | |
1918 | u16 seq; | |
1919 | ||
1920 | BT_DBG("chan %p", chan); | |
1921 | ||
1922 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1923 | return; | |
1924 | ||
b99e13ad MM |
1925 | if (__chan_is_moving(chan)) |
1926 | return; | |
1927 | ||
e1fbd4c1 MM |
1928 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
1929 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1930 | ||
1931 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1932 | if (!skb) { | |
1933 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1934 | seq); |
e1fbd4c1 MM |
1935 | continue; |
1936 | } | |
1937 | ||
1938 | bt_cb(skb)->control.retries++; | |
1939 | control = bt_cb(skb)->control; | |
1940 | ||
1941 | if (chan->max_tx != 0 && | |
1942 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1943 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 1944 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
1945 | l2cap_seq_list_clear(&chan->retrans_list); |
1946 | break; | |
1947 | } | |
1948 | ||
1949 | control.reqseq = chan->buffer_seq; | |
1950 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1951 | control.final = 1; | |
1952 | else | |
1953 | control.final = 0; | |
1954 | ||
1955 | if (skb_cloned(skb)) { | |
1956 | /* Cloned sk_buffs are read-only, so we need a | |
1957 | * writeable copy | |
1958 | */ | |
8bcde1f2 | 1959 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1960 | } else { |
8bcde1f2 | 1961 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1962 | } |
1963 | ||
1964 | if (!tx_skb) { | |
1965 | l2cap_seq_list_clear(&chan->retrans_list); | |
1966 | break; | |
1967 | } | |
1968 | ||
1969 | /* Update skb contents */ | |
1970 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1971 | put_unaligned_le32(__pack_extended_control(&control), | |
1972 | tx_skb->data + L2CAP_HDR_SIZE); | |
1973 | } else { | |
1974 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1975 | tx_skb->data + L2CAP_HDR_SIZE); | |
1976 | } | |
1977 | ||
13cac152 | 1978 | /* Update FCS */ |
e1fbd4c1 | 1979 | if (chan->fcs == L2CAP_FCS_CRC16) { |
13cac152 LR |
1980 | u16 fcs = crc16(0, (u8 *) tx_skb->data, |
1981 | tx_skb->len - L2CAP_FCS_SIZE); | |
1982 | put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) - | |
1983 | L2CAP_FCS_SIZE); | |
e1fbd4c1 MM |
1984 | } |
1985 | ||
1986 | l2cap_do_send(chan, tx_skb); | |
1987 | ||
1988 | BT_DBG("Resent txseq %d", control.txseq); | |
1989 | ||
1990 | chan->last_acked_seq = chan->buffer_seq; | |
1991 | } | |
1992 | } | |
1993 | ||
f80842a8 MM |
1994 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1995 | struct l2cap_ctrl *control) | |
1996 | { | |
1997 | BT_DBG("chan %p, control %p", chan, control); | |
1998 | ||
1999 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2000 | l2cap_ertm_resend(chan); | |
2001 | } | |
2002 | ||
d2a7ac5d MM |
2003 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2004 | struct l2cap_ctrl *control) | |
2005 | { | |
e1fbd4c1 MM |
2006 | struct sk_buff *skb; |
2007 | ||
2008 | BT_DBG("chan %p, control %p", chan, control); | |
2009 | ||
2010 | if (control->poll) | |
2011 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2012 | ||
2013 | l2cap_seq_list_clear(&chan->retrans_list); | |
2014 | ||
2015 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2016 | return; | |
2017 | ||
2018 | if (chan->unacked_frames) { | |
2019 | skb_queue_walk(&chan->tx_q, skb) { | |
2020 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2021 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2022 | break; |
2023 | } | |
2024 | ||
2025 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2026 | if (skb == chan->tx_send_head) | |
2027 | break; | |
2028 | ||
2029 | l2cap_seq_list_append(&chan->retrans_list, | |
2030 | bt_cb(skb)->control.txseq); | |
2031 | } | |
2032 | ||
2033 | l2cap_ertm_resend(chan); | |
2034 | } | |
d2a7ac5d MM |
2035 | } |
2036 | ||
0a0aba42 | 2037 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2038 | { |
0a0aba42 MM |
2039 | struct l2cap_ctrl control; |
2040 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2041 | chan->last_acked_seq); | |
2042 | int threshold; | |
9e917af1 | 2043 | |
0a0aba42 MM |
2044 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2045 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2046 | |
0a0aba42 MM |
2047 | memset(&control, 0, sizeof(control)); |
2048 | control.sframe = 1; | |
dfc909be | 2049 | |
0a0aba42 MM |
2050 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2051 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2052 | __clear_ack_timer(chan); | |
2053 | control.super = L2CAP_SUPER_RNR; | |
2054 | control.reqseq = chan->buffer_seq; | |
2055 | l2cap_send_sframe(chan, &control); | |
2056 | } else { | |
2057 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2058 | l2cap_ertm_send(chan); | |
2059 | /* If any i-frames were sent, they included an ack */ | |
2060 | if (chan->buffer_seq == chan->last_acked_seq) | |
2061 | frames_to_ack = 0; | |
2062 | } | |
dfc909be | 2063 | |
c20f8e35 | 2064 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2065 | * Calculate without mul or div |
2066 | */ | |
c20f8e35 | 2067 | threshold = chan->ack_win; |
0a0aba42 MM |
2068 | threshold += threshold << 1; |
2069 | threshold >>= 2; | |
2070 | ||
b4400672 | 2071 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2072 | threshold); |
2073 | ||
2074 | if (frames_to_ack >= threshold) { | |
2075 | __clear_ack_timer(chan); | |
2076 | control.super = L2CAP_SUPER_RR; | |
2077 | control.reqseq = chan->buffer_seq; | |
2078 | l2cap_send_sframe(chan, &control); | |
2079 | frames_to_ack = 0; | |
2080 | } | |
1c2acffb | 2081 | |
0a0aba42 MM |
2082 | if (frames_to_ack) |
2083 | __set_ack_timer(chan); | |
2084 | } | |
b17e73bb SJ |
2085 | } |
2086 | ||
04124681 GP |
2087 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2088 | struct msghdr *msg, int len, | |
2089 | int count, struct sk_buff *skb) | |
1c2acffb | 2090 | { |
0952a57a | 2091 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2092 | struct sk_buff **frag; |
90338947 | 2093 | int sent = 0; |
1da177e4 | 2094 | |
0498878b JR |
2095 | if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count), |
2096 | msg->msg_iov, count)) | |
1c2acffb | 2097 | return -EFAULT; |
1da177e4 LT |
2098 | |
2099 | sent += count; | |
2100 | len -= count; | |
2101 | ||
2102 | /* Continuation fragments (no L2CAP header) */ | |
2103 | frag = &skb_shinfo(skb)->frag_list; | |
2104 | while (len) { | |
fbe00700 GP |
2105 | struct sk_buff *tmp; |
2106 | ||
1da177e4 LT |
2107 | count = min_t(unsigned int, conn->mtu, len); |
2108 | ||
d9fbd02b | 2109 | tmp = chan->ops->alloc_skb(chan, 0, count, |
fbe00700 GP |
2110 | msg->msg_flags & MSG_DONTWAIT); |
2111 | if (IS_ERR(tmp)) | |
2112 | return PTR_ERR(tmp); | |
2113 | ||
2114 | *frag = tmp; | |
2f7719ce | 2115 | |
0498878b JR |
2116 | if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count), |
2117 | msg->msg_iov, count)) | |
1c2acffb | 2118 | return -EFAULT; |
1da177e4 LT |
2119 | |
2120 | sent += count; | |
2121 | len -= count; | |
2122 | ||
2d0ed3d5 GP |
2123 | skb->len += (*frag)->len; |
2124 | skb->data_len += (*frag)->len; | |
2125 | ||
1da177e4 LT |
2126 | frag = &(*frag)->next; |
2127 | } | |
1da177e4 LT |
2128 | |
2129 | return sent; | |
1c2acffb | 2130 | } |
1da177e4 | 2131 | |
5e59b791 | 2132 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
8d46321c | 2133 | struct msghdr *msg, size_t len) |
1c2acffb | 2134 | { |
8c1d787b | 2135 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2136 | struct sk_buff *skb; |
03a51213 | 2137 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2138 | struct l2cap_hdr *lh; |
2139 | ||
8d46321c MH |
2140 | BT_DBG("chan %p psm 0x%2.2x len %zu", chan, |
2141 | __le16_to_cpu(chan->psm), len); | |
1c2acffb GP |
2142 | |
2143 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce | 2144 | |
d9fbd02b | 2145 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2146 | msg->msg_flags & MSG_DONTWAIT); |
2147 | if (IS_ERR(skb)) | |
2148 | return skb; | |
1c2acffb GP |
2149 | |
2150 | /* Create L2CAP header */ | |
2151 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2152 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2153 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2154 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2155 | |
0952a57a | 2156 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2157 | if (unlikely(err < 0)) { |
2158 | kfree_skb(skb); | |
2159 | return ERR_PTR(err); | |
2160 | } | |
2161 | return skb; | |
2162 | } | |
2163 | ||
5e59b791 | 2164 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
8d46321c | 2165 | struct msghdr *msg, size_t len) |
1c2acffb | 2166 | { |
8c1d787b | 2167 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2168 | struct sk_buff *skb; |
f2ba7fae | 2169 | int err, count; |
1c2acffb GP |
2170 | struct l2cap_hdr *lh; |
2171 | ||
b4400672 | 2172 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2173 | |
f2ba7fae | 2174 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2175 | |
d9fbd02b | 2176 | skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, |
90338947 GP |
2177 | msg->msg_flags & MSG_DONTWAIT); |
2178 | if (IS_ERR(skb)) | |
2179 | return skb; | |
1c2acffb GP |
2180 | |
2181 | /* Create L2CAP header */ | |
2182 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2183 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2184 | lh->len = cpu_to_le16(len); |
1c2acffb | 2185 | |
0952a57a | 2186 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2187 | if (unlikely(err < 0)) { |
2188 | kfree_skb(skb); | |
2189 | return ERR_PTR(err); | |
2190 | } | |
2191 | return skb; | |
2192 | } | |
2193 | ||
ab0ff76d | 2194 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2195 | struct msghdr *msg, size_t len, |
2196 | u16 sdulen) | |
1c2acffb | 2197 | { |
8c1d787b | 2198 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2199 | struct sk_buff *skb; |
e4ca6d98 | 2200 | int err, count, hlen; |
1c2acffb GP |
2201 | struct l2cap_hdr *lh; |
2202 | ||
b4400672 | 2203 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2204 | |
0ee0d208 GP |
2205 | if (!conn) |
2206 | return ERR_PTR(-ENOTCONN); | |
2207 | ||
ba7aa64f | 2208 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2209 | |
c74e560c | 2210 | if (sdulen) |
03a51213 | 2211 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2212 | |
47d1ec61 | 2213 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2214 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2215 | |
1c2acffb | 2216 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce | 2217 | |
d9fbd02b | 2218 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2219 | msg->msg_flags & MSG_DONTWAIT); |
2220 | if (IS_ERR(skb)) | |
2221 | return skb; | |
1c2acffb GP |
2222 | |
2223 | /* Create L2CAP header */ | |
2224 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2225 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2226 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2227 | |
18a48e76 MM |
2228 | /* Control header is populated later */ |
2229 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2230 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2231 | else | |
2232 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2233 | |
c74e560c | 2234 | if (sdulen) |
03a51213 | 2235 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2236 | |
0952a57a | 2237 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2238 | if (unlikely(err < 0)) { |
2239 | kfree_skb(skb); | |
2240 | return ERR_PTR(err); | |
2241 | } | |
e90bac06 | 2242 | |
18a48e76 | 2243 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2244 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2245 | return skb; |
1da177e4 LT |
2246 | } |
2247 | ||
94122bbe MM |
2248 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2249 | struct sk_buff_head *seg_queue, | |
2250 | struct msghdr *msg, size_t len) | |
c74e560c | 2251 | { |
c74e560c | 2252 | struct sk_buff *skb; |
94122bbe MM |
2253 | u16 sdu_len; |
2254 | size_t pdu_len; | |
94122bbe | 2255 | u8 sar; |
c74e560c | 2256 | |
b4400672 | 2257 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2258 | |
94122bbe MM |
2259 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2260 | * so fragmented skbs are not used. The HCI layer's handling | |
2261 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2262 | */ | |
c74e560c | 2263 | |
94122bbe MM |
2264 | /* PDU size is derived from the HCI MTU */ |
2265 | pdu_len = chan->conn->mtu; | |
c74e560c | 2266 | |
a549574d MM |
2267 | /* Constrain PDU size for BR/EDR connections */ |
2268 | if (!chan->hs_hcon) | |
2269 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2270 | |
2271 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2272 | if (chan->fcs) |
2273 | pdu_len -= L2CAP_FCS_SIZE; | |
2274 | ||
ba7aa64f | 2275 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2276 | |
2277 | /* Remote device may have requested smaller PDUs */ | |
2278 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2279 | ||
2280 | if (len <= pdu_len) { | |
2281 | sar = L2CAP_SAR_UNSEGMENTED; | |
2282 | sdu_len = 0; | |
2283 | pdu_len = len; | |
2284 | } else { | |
2285 | sar = L2CAP_SAR_START; | |
2286 | sdu_len = len; | |
94122bbe MM |
2287 | } |
2288 | ||
2289 | while (len > 0) { | |
2290 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2291 | |
c74e560c | 2292 | if (IS_ERR(skb)) { |
94122bbe | 2293 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2294 | return PTR_ERR(skb); |
2295 | } | |
2296 | ||
94122bbe MM |
2297 | bt_cb(skb)->control.sar = sar; |
2298 | __skb_queue_tail(seg_queue, skb); | |
2299 | ||
2300 | len -= pdu_len; | |
069cb270 | 2301 | if (sdu_len) |
94122bbe | 2302 | sdu_len = 0; |
94122bbe MM |
2303 | |
2304 | if (len <= pdu_len) { | |
2305 | sar = L2CAP_SAR_END; | |
2306 | pdu_len = len; | |
2307 | } else { | |
2308 | sar = L2CAP_SAR_CONTINUE; | |
2309 | } | |
c74e560c | 2310 | } |
c74e560c | 2311 | |
f0f62799 | 2312 | return 0; |
c74e560c GP |
2313 | } |
2314 | ||
177f8f2b JH |
2315 | static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, |
2316 | struct msghdr *msg, | |
2317 | size_t len, u16 sdulen) | |
2318 | { | |
2319 | struct l2cap_conn *conn = chan->conn; | |
2320 | struct sk_buff *skb; | |
2321 | int err, count, hlen; | |
2322 | struct l2cap_hdr *lh; | |
2323 | ||
2324 | BT_DBG("chan %p len %zu", chan, len); | |
2325 | ||
2326 | if (!conn) | |
2327 | return ERR_PTR(-ENOTCONN); | |
2328 | ||
2329 | hlen = L2CAP_HDR_SIZE; | |
2330 | ||
2331 | if (sdulen) | |
2332 | hlen += L2CAP_SDULEN_SIZE; | |
2333 | ||
2334 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2335 | ||
d9fbd02b | 2336 | skb = chan->ops->alloc_skb(chan, hlen, count, |
177f8f2b JH |
2337 | msg->msg_flags & MSG_DONTWAIT); |
2338 | if (IS_ERR(skb)) | |
2339 | return skb; | |
2340 | ||
2341 | /* Create L2CAP header */ | |
2342 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
2343 | lh->cid = cpu_to_le16(chan->dcid); | |
2344 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
2345 | ||
2346 | if (sdulen) | |
2347 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); | |
2348 | ||
2349 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); | |
2350 | if (unlikely(err < 0)) { | |
2351 | kfree_skb(skb); | |
2352 | return ERR_PTR(err); | |
2353 | } | |
2354 | ||
2355 | return skb; | |
2356 | } | |
2357 | ||
2358 | static int l2cap_segment_le_sdu(struct l2cap_chan *chan, | |
2359 | struct sk_buff_head *seg_queue, | |
2360 | struct msghdr *msg, size_t len) | |
2361 | { | |
2362 | struct sk_buff *skb; | |
2363 | size_t pdu_len; | |
2364 | u16 sdu_len; | |
2365 | ||
2366 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); | |
2367 | ||
177f8f2b | 2368 | sdu_len = len; |
72c6fb91 | 2369 | pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE; |
177f8f2b JH |
2370 | |
2371 | while (len > 0) { | |
2372 | if (len <= pdu_len) | |
2373 | pdu_len = len; | |
2374 | ||
2375 | skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); | |
2376 | if (IS_ERR(skb)) { | |
2377 | __skb_queue_purge(seg_queue); | |
2378 | return PTR_ERR(skb); | |
2379 | } | |
2380 | ||
2381 | __skb_queue_tail(seg_queue, skb); | |
2382 | ||
2383 | len -= pdu_len; | |
2384 | ||
2385 | if (sdu_len) { | |
2386 | sdu_len = 0; | |
2387 | pdu_len += L2CAP_SDULEN_SIZE; | |
2388 | } | |
2389 | } | |
2390 | ||
2391 | return 0; | |
2392 | } | |
2393 | ||
8d46321c | 2394 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
9a91a04a | 2395 | { |
9a91a04a | 2396 | struct sk_buff *skb; |
9a91a04a | 2397 | int err; |
94122bbe | 2398 | struct sk_buff_head seg_queue; |
9a91a04a | 2399 | |
31e8ce80 SWK |
2400 | if (!chan->conn) |
2401 | return -ENOTCONN; | |
2402 | ||
9a91a04a | 2403 | /* Connectionless channel */ |
715ec005 | 2404 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
8d46321c | 2405 | skb = l2cap_create_connless_pdu(chan, msg, len); |
9a91a04a GP |
2406 | if (IS_ERR(skb)) |
2407 | return PTR_ERR(skb); | |
2408 | ||
ede81a2a AK |
2409 | /* Channel lock is released before requesting new skb and then |
2410 | * reacquired thus we need to recheck channel state. | |
2411 | */ | |
2412 | if (chan->state != BT_CONNECTED) { | |
2413 | kfree_skb(skb); | |
2414 | return -ENOTCONN; | |
2415 | } | |
2416 | ||
9a91a04a GP |
2417 | l2cap_do_send(chan, skb); |
2418 | return len; | |
2419 | } | |
2420 | ||
2421 | switch (chan->mode) { | |
38319713 | 2422 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b JH |
2423 | /* Check outgoing MTU */ |
2424 | if (len > chan->omtu) | |
2425 | return -EMSGSIZE; | |
2426 | ||
fad5fc89 JH |
2427 | if (!chan->tx_credits) |
2428 | return -EAGAIN; | |
2429 | ||
177f8f2b JH |
2430 | __skb_queue_head_init(&seg_queue); |
2431 | ||
2432 | err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); | |
2433 | ||
2434 | if (chan->state != BT_CONNECTED) { | |
2435 | __skb_queue_purge(&seg_queue); | |
2436 | err = -ENOTCONN; | |
2437 | } | |
2438 | ||
2439 | if (err) | |
2440 | return err; | |
2441 | ||
2442 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); | |
2443 | ||
2444 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
2445 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
2446 | chan->tx_credits--; | |
2447 | } | |
2448 | ||
2449 | if (!chan->tx_credits) | |
2450 | chan->ops->suspend(chan); | |
2451 | ||
2452 | err = len; | |
2453 | ||
2454 | break; | |
2455 | ||
fad5fc89 | 2456 | case L2CAP_MODE_BASIC: |
9a91a04a GP |
2457 | /* Check outgoing MTU */ |
2458 | if (len > chan->omtu) | |
2459 | return -EMSGSIZE; | |
2460 | ||
2461 | /* Create a basic PDU */ | |
8d46321c | 2462 | skb = l2cap_create_basic_pdu(chan, msg, len); |
9a91a04a GP |
2463 | if (IS_ERR(skb)) |
2464 | return PTR_ERR(skb); | |
2465 | ||
ede81a2a AK |
2466 | /* Channel lock is released before requesting new skb and then |
2467 | * reacquired thus we need to recheck channel state. | |
2468 | */ | |
2469 | if (chan->state != BT_CONNECTED) { | |
2470 | kfree_skb(skb); | |
2471 | return -ENOTCONN; | |
2472 | } | |
2473 | ||
9a91a04a GP |
2474 | l2cap_do_send(chan, skb); |
2475 | err = len; | |
2476 | break; | |
2477 | ||
2478 | case L2CAP_MODE_ERTM: | |
2479 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2480 | /* Check outgoing MTU */ |
2481 | if (len > chan->omtu) { | |
2482 | err = -EMSGSIZE; | |
2483 | break; | |
2484 | } | |
9a91a04a | 2485 | |
94122bbe | 2486 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2487 | |
94122bbe MM |
2488 | /* Do segmentation before calling in to the state machine, |
2489 | * since it's possible to block while waiting for memory | |
2490 | * allocation. | |
2491 | */ | |
2492 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2493 | |
94122bbe MM |
2494 | /* The channel could have been closed while segmenting, |
2495 | * check that it is still connected. | |
2496 | */ | |
2497 | if (chan->state != BT_CONNECTED) { | |
2498 | __skb_queue_purge(&seg_queue); | |
2499 | err = -ENOTCONN; | |
9a91a04a GP |
2500 | } |
2501 | ||
94122bbe | 2502 | if (err) |
9a91a04a | 2503 | break; |
9a91a04a | 2504 | |
3733937d | 2505 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2506 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2507 | else |
d660366d | 2508 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2509 | |
d660366d | 2510 | err = len; |
9a91a04a | 2511 | |
94122bbe MM |
2512 | /* If the skbs were not queued for sending, they'll still be in |
2513 | * seg_queue and need to be purged. | |
2514 | */ | |
2515 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2516 | break; |
2517 | ||
2518 | default: | |
2519 | BT_DBG("bad state %1.1x", chan->mode); | |
2520 | err = -EBADFD; | |
2521 | } | |
2522 | ||
2523 | return err; | |
2524 | } | |
6b8d4a6a | 2525 | EXPORT_SYMBOL_GPL(l2cap_chan_send); |
9a91a04a | 2526 | |
d2a7ac5d MM |
2527 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2528 | { | |
bed68bde MM |
2529 | struct l2cap_ctrl control; |
2530 | u16 seq; | |
2531 | ||
b4400672 | 2532 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2533 | |
2534 | memset(&control, 0, sizeof(control)); | |
2535 | control.sframe = 1; | |
2536 | control.super = L2CAP_SUPER_SREJ; | |
2537 | ||
2538 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2539 | seq = __next_seq(chan, seq)) { | |
2540 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2541 | control.reqseq = seq; | |
2542 | l2cap_send_sframe(chan, &control); | |
2543 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2544 | } | |
2545 | } | |
2546 | ||
2547 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2548 | } |
2549 | ||
2550 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2551 | { | |
bed68bde MM |
2552 | struct l2cap_ctrl control; |
2553 | ||
2554 | BT_DBG("chan %p", chan); | |
2555 | ||
2556 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2557 | return; | |
2558 | ||
2559 | memset(&control, 0, sizeof(control)); | |
2560 | control.sframe = 1; | |
2561 | control.super = L2CAP_SUPER_SREJ; | |
2562 | control.reqseq = chan->srej_list.tail; | |
2563 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2564 | } |
2565 | ||
2566 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2567 | { | |
bed68bde MM |
2568 | struct l2cap_ctrl control; |
2569 | u16 initial_head; | |
2570 | u16 seq; | |
2571 | ||
b4400672 | 2572 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2573 | |
2574 | memset(&control, 0, sizeof(control)); | |
2575 | control.sframe = 1; | |
2576 | control.super = L2CAP_SUPER_SREJ; | |
2577 | ||
2578 | /* Capture initial list head to allow only one pass through the list. */ | |
2579 | initial_head = chan->srej_list.head; | |
2580 | ||
2581 | do { | |
2582 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2583 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2584 | break; | |
2585 | ||
2586 | control.reqseq = seq; | |
2587 | l2cap_send_sframe(chan, &control); | |
2588 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2589 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2590 | } |
2591 | ||
608bcc6d MM |
2592 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2593 | { | |
2594 | struct sk_buff *acked_skb; | |
2595 | u16 ackseq; | |
2596 | ||
b4400672 | 2597 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2598 | |
2599 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2600 | return; | |
2601 | ||
b4400672 | 2602 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2603 | chan->expected_ack_seq, chan->unacked_frames); |
2604 | ||
2605 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2606 | ackseq = __next_seq(chan, ackseq)) { | |
2607 | ||
2608 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2609 | if (acked_skb) { | |
2610 | skb_unlink(acked_skb, &chan->tx_q); | |
2611 | kfree_skb(acked_skb); | |
2612 | chan->unacked_frames--; | |
2613 | } | |
2614 | } | |
2615 | ||
2616 | chan->expected_ack_seq = reqseq; | |
2617 | ||
2618 | if (chan->unacked_frames == 0) | |
2619 | __clear_retrans_timer(chan); | |
2620 | ||
b4400672 | 2621 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2622 | } |
2623 | ||
2624 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2625 | { | |
2626 | BT_DBG("chan %p", chan); | |
2627 | ||
2628 | chan->expected_tx_seq = chan->buffer_seq; | |
2629 | l2cap_seq_list_clear(&chan->srej_list); | |
2630 | skb_queue_purge(&chan->srej_q); | |
2631 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2632 | } | |
2633 | ||
d660366d GP |
2634 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2635 | struct l2cap_ctrl *control, | |
2636 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2637 | { |
608bcc6d MM |
2638 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2639 | event); | |
2640 | ||
2641 | switch (event) { | |
2642 | case L2CAP_EV_DATA_REQUEST: | |
2643 | if (chan->tx_send_head == NULL) | |
2644 | chan->tx_send_head = skb_peek(skbs); | |
2645 | ||
2646 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2647 | l2cap_ertm_send(chan); | |
2648 | break; | |
2649 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2650 | BT_DBG("Enter LOCAL_BUSY"); | |
2651 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2652 | ||
2653 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2654 | /* The SREJ_SENT state must be aborted if we are to | |
2655 | * enter the LOCAL_BUSY state. | |
2656 | */ | |
2657 | l2cap_abort_rx_srej_sent(chan); | |
2658 | } | |
2659 | ||
2660 | l2cap_send_ack(chan); | |
2661 | ||
2662 | break; | |
2663 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2664 | BT_DBG("Exit LOCAL_BUSY"); | |
2665 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2666 | ||
2667 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2668 | struct l2cap_ctrl local_control; | |
2669 | ||
2670 | memset(&local_control, 0, sizeof(local_control)); | |
2671 | local_control.sframe = 1; | |
2672 | local_control.super = L2CAP_SUPER_RR; | |
2673 | local_control.poll = 1; | |
2674 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2675 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2676 | |
2677 | chan->retry_count = 1; | |
2678 | __set_monitor_timer(chan); | |
2679 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2680 | } | |
2681 | break; | |
2682 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2683 | l2cap_process_reqseq(chan, control->reqseq); | |
2684 | break; | |
2685 | case L2CAP_EV_EXPLICIT_POLL: | |
2686 | l2cap_send_rr_or_rnr(chan, 1); | |
2687 | chan->retry_count = 1; | |
2688 | __set_monitor_timer(chan); | |
2689 | __clear_ack_timer(chan); | |
2690 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2691 | break; | |
2692 | case L2CAP_EV_RETRANS_TO: | |
2693 | l2cap_send_rr_or_rnr(chan, 1); | |
2694 | chan->retry_count = 1; | |
2695 | __set_monitor_timer(chan); | |
2696 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2697 | break; | |
2698 | case L2CAP_EV_RECV_FBIT: | |
2699 | /* Nothing to process */ | |
2700 | break; | |
2701 | default: | |
2702 | break; | |
2703 | } | |
608bcc6d MM |
2704 | } |
2705 | ||
d660366d GP |
2706 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2707 | struct l2cap_ctrl *control, | |
2708 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2709 | { |
608bcc6d MM |
2710 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2711 | event); | |
2712 | ||
2713 | switch (event) { | |
2714 | case L2CAP_EV_DATA_REQUEST: | |
2715 | if (chan->tx_send_head == NULL) | |
2716 | chan->tx_send_head = skb_peek(skbs); | |
2717 | /* Queue data, but don't send. */ | |
2718 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2719 | break; | |
2720 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2721 | BT_DBG("Enter LOCAL_BUSY"); | |
2722 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2723 | ||
2724 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2725 | /* The SREJ_SENT state must be aborted if we are to | |
2726 | * enter the LOCAL_BUSY state. | |
2727 | */ | |
2728 | l2cap_abort_rx_srej_sent(chan); | |
2729 | } | |
2730 | ||
2731 | l2cap_send_ack(chan); | |
2732 | ||
2733 | break; | |
2734 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2735 | BT_DBG("Exit LOCAL_BUSY"); | |
2736 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2737 | ||
2738 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2739 | struct l2cap_ctrl local_control; | |
2740 | memset(&local_control, 0, sizeof(local_control)); | |
2741 | local_control.sframe = 1; | |
2742 | local_control.super = L2CAP_SUPER_RR; | |
2743 | local_control.poll = 1; | |
2744 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2745 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2746 | |
2747 | chan->retry_count = 1; | |
2748 | __set_monitor_timer(chan); | |
2749 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2750 | } | |
2751 | break; | |
2752 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2753 | l2cap_process_reqseq(chan, control->reqseq); | |
2754 | ||
2755 | /* Fall through */ | |
2756 | ||
2757 | case L2CAP_EV_RECV_FBIT: | |
2758 | if (control && control->final) { | |
2759 | __clear_monitor_timer(chan); | |
2760 | if (chan->unacked_frames > 0) | |
2761 | __set_retrans_timer(chan); | |
2762 | chan->retry_count = 0; | |
2763 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2764 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2765 | } | |
2766 | break; | |
2767 | case L2CAP_EV_EXPLICIT_POLL: | |
2768 | /* Ignore */ | |
2769 | break; | |
2770 | case L2CAP_EV_MONITOR_TO: | |
2771 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2772 | l2cap_send_rr_or_rnr(chan, 1); | |
2773 | __set_monitor_timer(chan); | |
2774 | chan->retry_count++; | |
2775 | } else { | |
5e4e3972 | 2776 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2777 | } |
2778 | break; | |
2779 | default: | |
2780 | break; | |
2781 | } | |
608bcc6d MM |
2782 | } |
2783 | ||
d660366d GP |
2784 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2785 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2786 | { |
608bcc6d MM |
2787 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2788 | chan, control, skbs, event, chan->tx_state); | |
2789 | ||
2790 | switch (chan->tx_state) { | |
2791 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2792 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2793 | break; |
2794 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2795 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2796 | break; |
2797 | default: | |
2798 | /* Ignore event */ | |
2799 | break; | |
2800 | } | |
608bcc6d MM |
2801 | } |
2802 | ||
4b51dae9 MM |
2803 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2804 | struct l2cap_ctrl *control) | |
2805 | { | |
2806 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2807 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2808 | } |
2809 | ||
f80842a8 MM |
2810 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2811 | struct l2cap_ctrl *control) | |
2812 | { | |
2813 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2814 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2815 | } |
2816 | ||
1da177e4 LT |
2817 | /* Copy frame to all raw sockets on that connection */ |
2818 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2819 | { | |
1da177e4 | 2820 | struct sk_buff *nskb; |
48454079 | 2821 | struct l2cap_chan *chan; |
1da177e4 LT |
2822 | |
2823 | BT_DBG("conn %p", conn); | |
2824 | ||
3df91ea2 | 2825 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2826 | |
3df91ea2 | 2827 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2828 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2829 | continue; |
2830 | ||
7f5396a7 GP |
2831 | /* Don't send frame to the channel it came from */ |
2832 | if (bt_cb(skb)->chan == chan) | |
1da177e4 | 2833 | continue; |
7f5396a7 | 2834 | |
8bcde1f2 | 2835 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2836 | if (!nskb) |
1da177e4 | 2837 | continue; |
80b98027 | 2838 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2839 | kfree_skb(nskb); |
2840 | } | |
3d57dc68 | 2841 | |
3df91ea2 | 2842 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2843 | } |
2844 | ||
2845 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2846 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2847 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2848 | { |
2849 | struct sk_buff *skb, **frag; | |
2850 | struct l2cap_cmd_hdr *cmd; | |
2851 | struct l2cap_hdr *lh; | |
2852 | int len, count; | |
2853 | ||
b4400672 AE |
2854 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2855 | conn, code, ident, dlen); | |
1da177e4 | 2856 | |
300b962e AL |
2857 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2858 | return NULL; | |
2859 | ||
1da177e4 LT |
2860 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2861 | count = min_t(unsigned int, conn->mtu, len); | |
2862 | ||
8bcde1f2 | 2863 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2864 | if (!skb) |
2865 | return NULL; | |
2866 | ||
2867 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2868 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2869 | |
2870 | if (conn->hcon->type == LE_LINK) | |
dcf4adbf | 2871 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2872 | else |
dcf4adbf | 2873 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2874 | |
2875 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2876 | cmd->code = code; | |
2877 | cmd->ident = ident; | |
aca3192c | 2878 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2879 | |
2880 | if (dlen) { | |
2881 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2882 | memcpy(skb_put(skb, count), data, count); | |
2883 | data += count; | |
2884 | } | |
2885 | ||
2886 | len -= skb->len; | |
2887 | ||
2888 | /* Continuation fragments (no L2CAP header) */ | |
2889 | frag = &skb_shinfo(skb)->frag_list; | |
2890 | while (len) { | |
2891 | count = min_t(unsigned int, conn->mtu, len); | |
2892 | ||
8bcde1f2 | 2893 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2894 | if (!*frag) |
2895 | goto fail; | |
2896 | ||
2897 | memcpy(skb_put(*frag, count), data, count); | |
2898 | ||
2899 | len -= count; | |
2900 | data += count; | |
2901 | ||
2902 | frag = &(*frag)->next; | |
2903 | } | |
2904 | ||
2905 | return skb; | |
2906 | ||
2907 | fail: | |
2908 | kfree_skb(skb); | |
2909 | return NULL; | |
2910 | } | |
2911 | ||
2d792818 GP |
2912 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2913 | unsigned long *val) | |
1da177e4 LT |
2914 | { |
2915 | struct l2cap_conf_opt *opt = *ptr; | |
2916 | int len; | |
2917 | ||
2918 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2919 | *ptr += len; | |
2920 | ||
2921 | *type = opt->type; | |
2922 | *olen = opt->len; | |
2923 | ||
2924 | switch (opt->len) { | |
2925 | case 1: | |
2926 | *val = *((u8 *) opt->val); | |
2927 | break; | |
2928 | ||
2929 | case 2: | |
bfaaeb3e | 2930 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2931 | break; |
2932 | ||
2933 | case 4: | |
bfaaeb3e | 2934 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2935 | break; |
2936 | ||
2937 | default: | |
2938 | *val = (unsigned long) opt->val; | |
2939 | break; | |
2940 | } | |
2941 | ||
b4400672 | 2942 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2943 | return len; |
2944 | } | |
2945 | ||
1da177e4 LT |
2946 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2947 | { | |
2948 | struct l2cap_conf_opt *opt = *ptr; | |
2949 | ||
b4400672 | 2950 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2951 | |
2952 | opt->type = type; | |
2953 | opt->len = len; | |
2954 | ||
2955 | switch (len) { | |
2956 | case 1: | |
2957 | *((u8 *) opt->val) = val; | |
2958 | break; | |
2959 | ||
2960 | case 2: | |
4f8b691c | 2961 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2962 | break; |
2963 | ||
2964 | case 4: | |
4f8b691c | 2965 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2966 | break; |
2967 | ||
2968 | default: | |
2969 | memcpy(opt->val, (void *) val, len); | |
2970 | break; | |
2971 | } | |
2972 | ||
2973 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2974 | } | |
2975 | ||
f89cef09 AE |
2976 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2977 | { | |
2978 | struct l2cap_conf_efs efs; | |
2979 | ||
1ec918ce | 2980 | switch (chan->mode) { |
f89cef09 AE |
2981 | case L2CAP_MODE_ERTM: |
2982 | efs.id = chan->local_id; | |
2983 | efs.stype = chan->local_stype; | |
2984 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2985 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
dcf4adbf JP |
2986 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
2987 | efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
2988 | break; |
2989 | ||
2990 | case L2CAP_MODE_STREAMING: | |
2991 | efs.id = 1; | |
2992 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2993 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2994 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2995 | efs.acc_lat = 0; | |
2996 | efs.flush_to = 0; | |
2997 | break; | |
2998 | ||
2999 | default: | |
3000 | return; | |
3001 | } | |
3002 | ||
3003 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 3004 | (unsigned long) &efs); |
f89cef09 AE |
3005 | } |
3006 | ||
721c4181 | 3007 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3008 | { |
721c4181 | 3009 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3010 | ack_timer.work); |
3011 | u16 frames_to_ack; | |
c1b4f43b | 3012 | |
2fb9b3d4 GP |
3013 | BT_DBG("chan %p", chan); |
3014 | ||
6be36555 AE |
3015 | l2cap_chan_lock(chan); |
3016 | ||
0362520b MM |
3017 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3018 | chan->last_acked_seq); | |
6be36555 | 3019 | |
0362520b MM |
3020 | if (frames_to_ack) |
3021 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3022 | |
0362520b | 3023 | l2cap_chan_unlock(chan); |
09bfb2ee | 3024 | l2cap_chan_put(chan); |
c1b4f43b GP |
3025 | } |
3026 | ||
466f8004 | 3027 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3028 | { |
3c588192 MM |
3029 | int err; |
3030 | ||
105bdf9e MM |
3031 | chan->next_tx_seq = 0; |
3032 | chan->expected_tx_seq = 0; | |
42e5c802 | 3033 | chan->expected_ack_seq = 0; |
6a026610 | 3034 | chan->unacked_frames = 0; |
42e5c802 | 3035 | chan->buffer_seq = 0; |
6a026610 | 3036 | chan->frames_sent = 0; |
105bdf9e MM |
3037 | chan->last_acked_seq = 0; |
3038 | chan->sdu = NULL; | |
3039 | chan->sdu_last_frag = NULL; | |
3040 | chan->sdu_len = 0; | |
3041 | ||
d34c34fb MM |
3042 | skb_queue_head_init(&chan->tx_q); |
3043 | ||
6ed971ca MH |
3044 | chan->local_amp_id = AMP_ID_BREDR; |
3045 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3046 | chan->move_state = L2CAP_MOVE_STABLE; |
3047 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3048 | ||
105bdf9e MM |
3049 | if (chan->mode != L2CAP_MODE_ERTM) |
3050 | return 0; | |
3051 | ||
3052 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3053 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3054 | |
721c4181 GP |
3055 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3056 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3057 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3058 | |
f1c6775b | 3059 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3060 | |
3c588192 MM |
3061 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3062 | if (err < 0) | |
3063 | return err; | |
3064 | ||
9dc9affc MM |
3065 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3066 | if (err < 0) | |
3067 | l2cap_seq_list_free(&chan->srej_list); | |
3068 | ||
3069 | return err; | |
0565c1c2 GP |
3070 | } |
3071 | ||
f2fcfcd6 GP |
3072 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3073 | { | |
3074 | switch (mode) { | |
3075 | case L2CAP_MODE_STREAMING: | |
3076 | case L2CAP_MODE_ERTM: | |
3077 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3078 | return mode; | |
3079 | /* fall through */ | |
3080 | default: | |
3081 | return L2CAP_MODE_BASIC; | |
3082 | } | |
3083 | } | |
3084 | ||
848566b3 | 3085 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3086 | { |
848566b3 | 3087 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; |
6327eb98 AE |
3088 | } |
3089 | ||
848566b3 | 3090 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3091 | { |
848566b3 | 3092 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; |
f89cef09 AE |
3093 | } |
3094 | ||
36c86c85 MM |
3095 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3096 | struct l2cap_conf_rfc *rfc) | |
3097 | { | |
6ed971ca | 3098 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3099 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3100 | ||
3101 | /* Class 1 devices have must have ERTM timeouts | |
3102 | * exceeding the Link Supervision Timeout. The | |
3103 | * default Link Supervision Timeout for AMP | |
3104 | * controllers is 10 seconds. | |
3105 | * | |
3106 | * Class 1 devices use 0xffffffff for their | |
3107 | * best-effort flush timeout, so the clamping logic | |
3108 | * will result in a timeout that meets the above | |
3109 | * requirement. ERTM timeouts are 16-bit values, so | |
3110 | * the maximum timeout is 65.535 seconds. | |
3111 | */ | |
3112 | ||
3113 | /* Convert timeout to milliseconds and round */ | |
3114 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3115 | ||
3116 | /* This is the recommended formula for class 2 devices | |
3117 | * that start ERTM timers when packets are sent to the | |
3118 | * controller. | |
3119 | */ | |
3120 | ertm_to = 3 * ertm_to + 500; | |
3121 | ||
3122 | if (ertm_to > 0xffff) | |
3123 | ertm_to = 0xffff; | |
3124 | ||
3125 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3126 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3127 | } else { | |
dcf4adbf JP |
3128 | rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3129 | rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36c86c85 MM |
3130 | } |
3131 | } | |
3132 | ||
6327eb98 AE |
3133 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3134 | { | |
3135 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3136 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3137 | /* use extended control field */ |
3138 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3139 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3140 | } else { | |
6327eb98 | 3141 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3142 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3143 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3144 | } | |
c20f8e35 | 3145 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3146 | } |
3147 | ||
710f9b0a | 3148 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3149 | { |
1da177e4 | 3150 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3151 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3152 | void *ptr = req->data; |
c8f79162 | 3153 | u16 size; |
1da177e4 | 3154 | |
49208c9c | 3155 | BT_DBG("chan %p", chan); |
1da177e4 | 3156 | |
73ffa904 | 3157 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3158 | goto done; |
3159 | ||
0c1bc5c6 | 3160 | switch (chan->mode) { |
f2fcfcd6 GP |
3161 | case L2CAP_MODE_STREAMING: |
3162 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3163 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3164 | break; |
85eb53c6 | 3165 | |
848566b3 | 3166 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3167 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3168 | ||
2ba13ed6 | 3169 | /* fall through */ |
f2fcfcd6 | 3170 | default: |
8c1d787b | 3171 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3172 | break; |
3173 | } | |
3174 | ||
3175 | done: | |
0c1bc5c6 GP |
3176 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3177 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3178 | |
0c1bc5c6 | 3179 | switch (chan->mode) { |
65c7c491 | 3180 | case L2CAP_MODE_BASIC: |
6fea7ad1 MH |
3181 | if (disable_ertm) |
3182 | break; | |
3183 | ||
8c1d787b | 3184 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3185 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3186 | break; |
3187 | ||
62547752 GP |
3188 | rfc.mode = L2CAP_MODE_BASIC; |
3189 | rfc.txwin_size = 0; | |
3190 | rfc.max_transmit = 0; | |
3191 | rfc.retrans_timeout = 0; | |
3192 | rfc.monitor_timeout = 0; | |
3193 | rfc.max_pdu_size = 0; | |
3194 | ||
63406504 | 3195 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3196 | (unsigned long) &rfc); |
65c7c491 MH |
3197 | break; |
3198 | ||
3199 | case L2CAP_MODE_ERTM: | |
3200 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3201 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3202 | |
3203 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
c8f79162 AE |
3204 | |
3205 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3206 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3207 | L2CAP_FCS_SIZE); | |
c8f79162 | 3208 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3209 | |
6327eb98 AE |
3210 | l2cap_txwin_setup(chan); |
3211 | ||
3212 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3213 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3214 | |
63406504 | 3215 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3216 | (unsigned long) &rfc); |
63406504 | 3217 | |
f89cef09 AE |
3218 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3219 | l2cap_add_opt_efs(&ptr, chan); | |
3220 | ||
6327eb98 AE |
3221 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3222 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3223 | chan->tx_win); |
60918918 AE |
3224 | |
3225 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3226 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3227 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3228 | chan->fcs = L2CAP_FCS_NONE; |
3229 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3230 | chan->fcs); | |
3231 | } | |
f2fcfcd6 GP |
3232 | break; |
3233 | ||
3234 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3235 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3236 | rfc.mode = L2CAP_MODE_STREAMING; |
3237 | rfc.txwin_size = 0; | |
3238 | rfc.max_transmit = 0; | |
3239 | rfc.retrans_timeout = 0; | |
3240 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3241 | |
3242 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3243 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3244 | L2CAP_FCS_SIZE); | |
c8f79162 | 3245 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3246 | |
63406504 | 3247 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3248 | (unsigned long) &rfc); |
63406504 | 3249 | |
f89cef09 AE |
3250 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3251 | l2cap_add_opt_efs(&ptr, chan); | |
3252 | ||
60918918 AE |
3253 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3254 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3255 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3256 | chan->fcs = L2CAP_FCS_NONE; |
3257 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3258 | chan->fcs); | |
3259 | } | |
65c7c491 MH |
3260 | break; |
3261 | } | |
1da177e4 | 3262 | |
fe4128e0 | 3263 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3264 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
3265 | |
3266 | return ptr - data; | |
3267 | } | |
3268 | ||
73ffa904 | 3269 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3270 | { |
5dee9e7c MH |
3271 | struct l2cap_conf_rsp *rsp = data; |
3272 | void *ptr = rsp->data; | |
73ffa904 GP |
3273 | void *req = chan->conf_req; |
3274 | int len = chan->conf_len; | |
5dee9e7c MH |
3275 | int type, hint, olen; |
3276 | unsigned long val; | |
6464f35f | 3277 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3278 | struct l2cap_conf_efs efs; |
3279 | u8 remote_efs = 0; | |
861d6882 | 3280 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3281 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3282 | u16 size; |
1da177e4 | 3283 | |
73ffa904 | 3284 | BT_DBG("chan %p", chan); |
820ae1b8 | 3285 | |
5dee9e7c MH |
3286 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3287 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3288 | |
589d2746 | 3289 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3290 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3291 | |
3292 | switch (type) { | |
3293 | case L2CAP_CONF_MTU: | |
861d6882 | 3294 | mtu = val; |
5dee9e7c MH |
3295 | break; |
3296 | ||
3297 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3298 | chan->flush_to = val; |
5dee9e7c MH |
3299 | break; |
3300 | ||
3301 | case L2CAP_CONF_QOS: | |
3302 | break; | |
3303 | ||
6464f35f MH |
3304 | case L2CAP_CONF_RFC: |
3305 | if (olen == sizeof(rfc)) | |
3306 | memcpy(&rfc, (void *) val, olen); | |
3307 | break; | |
3308 | ||
fcc203c3 GP |
3309 | case L2CAP_CONF_FCS: |
3310 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3311 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3312 | break; |
fcc203c3 | 3313 | |
42dceae2 AE |
3314 | case L2CAP_CONF_EFS: |
3315 | remote_efs = 1; | |
3316 | if (olen == sizeof(efs)) | |
3317 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3318 | break; |
3319 | ||
6327eb98 | 3320 | case L2CAP_CONF_EWS: |
848566b3 | 3321 | if (!chan->conn->hs_enabled) |
6327eb98 | 3322 | return -ECONNREFUSED; |
fcc203c3 | 3323 | |
6327eb98 AE |
3324 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3325 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3326 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3327 | chan->remote_tx_win = val; |
fcc203c3 GP |
3328 | break; |
3329 | ||
5dee9e7c MH |
3330 | default: |
3331 | if (hint) | |
3332 | break; | |
3333 | ||
3334 | result = L2CAP_CONF_UNKNOWN; | |
3335 | *((u8 *) ptr++) = type; | |
3336 | break; | |
3337 | } | |
3338 | } | |
3339 | ||
73ffa904 | 3340 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3341 | goto done; |
3342 | ||
0c1bc5c6 | 3343 | switch (chan->mode) { |
f2fcfcd6 GP |
3344 | case L2CAP_MODE_STREAMING: |
3345 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3346 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3347 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3348 | chan->conn->feat_mask); |
85eb53c6 GP |
3349 | break; |
3350 | } | |
3351 | ||
42dceae2 | 3352 | if (remote_efs) { |
848566b3 | 3353 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3354 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3355 | else | |
3356 | return -ECONNREFUSED; | |
3357 | } | |
3358 | ||
0c1bc5c6 | 3359 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3360 | return -ECONNREFUSED; |
742e519b | 3361 | |
f2fcfcd6 | 3362 | break; |
f2fcfcd6 GP |
3363 | } |
3364 | ||
3365 | done: | |
0c1bc5c6 | 3366 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3367 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3368 | rfc.mode = chan->mode; |
f2fcfcd6 | 3369 | |
73ffa904 | 3370 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3371 | return -ECONNREFUSED; |
3372 | ||
2d792818 GP |
3373 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3374 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3375 | } |
3376 | ||
5dee9e7c MH |
3377 | if (result == L2CAP_CONF_SUCCESS) { |
3378 | /* Configure output options and let the other side know | |
3379 | * which ones we don't like. */ | |
3380 | ||
f2fcfcd6 GP |
3381 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3382 | result = L2CAP_CONF_UNACCEPT; | |
3383 | else { | |
0c1bc5c6 | 3384 | chan->omtu = mtu; |
c1360a1c | 3385 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3386 | } |
0c1bc5c6 | 3387 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3388 | |
42dceae2 AE |
3389 | if (remote_efs) { |
3390 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3391 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3392 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3393 | |
3394 | result = L2CAP_CONF_UNACCEPT; | |
3395 | ||
3396 | if (chan->num_conf_req >= 1) | |
3397 | return -ECONNREFUSED; | |
3398 | ||
3399 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3400 | sizeof(efs), |
3401 | (unsigned long) &efs); | |
0e8b207e | 3402 | } else { |
3e6b3b95 | 3403 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3404 | result = L2CAP_CONF_PENDING; |
3405 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3406 | } |
3407 | } | |
3408 | ||
f2fcfcd6 GP |
3409 | switch (rfc.mode) { |
3410 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3411 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3412 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3413 | break; |
3414 | ||
3415 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3416 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3417 | chan->remote_tx_win = rfc.txwin_size; | |
3418 | else | |
3419 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3420 | |
2c03a7a4 | 3421 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3422 | |
c8f79162 | 3423 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3424 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3425 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3426 | rfc.max_pdu_size = cpu_to_le16(size); |
3427 | chan->remote_mps = size; | |
f2fcfcd6 | 3428 | |
36c86c85 | 3429 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3430 | |
c1360a1c | 3431 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3432 | |
3433 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3434 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3435 | |
42dceae2 AE |
3436 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3437 | chan->remote_id = efs.id; | |
3438 | chan->remote_stype = efs.stype; | |
3439 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3440 | chan->remote_flush_to = | |
2d792818 | 3441 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3442 | chan->remote_acc_lat = |
2d792818 | 3443 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3444 | chan->remote_sdu_itime = |
3445 | le32_to_cpu(efs.sdu_itime); | |
3446 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3447 | sizeof(efs), |
3448 | (unsigned long) &efs); | |
42dceae2 | 3449 | } |
f2fcfcd6 GP |
3450 | break; |
3451 | ||
3452 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3453 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3454 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3455 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3456 | rfc.max_pdu_size = cpu_to_le16(size); |
3457 | chan->remote_mps = size; | |
f2fcfcd6 | 3458 | |
c1360a1c | 3459 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3460 | |
2d792818 GP |
3461 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3462 | (unsigned long) &rfc); | |
68ae6639 | 3463 | |
f2fcfcd6 GP |
3464 | break; |
3465 | ||
3466 | default: | |
5dee9e7c | 3467 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3468 | |
6464f35f | 3469 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3470 | rfc.mode = chan->mode; |
f2fcfcd6 | 3471 | } |
6464f35f | 3472 | |
f2fcfcd6 | 3473 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3474 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3475 | } |
fe4128e0 | 3476 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3477 | rsp->result = cpu_to_le16(result); |
dcf4adbf | 3478 | rsp->flags = cpu_to_le16(0); |
5dee9e7c MH |
3479 | |
3480 | return ptr - data; | |
1da177e4 LT |
3481 | } |
3482 | ||
2d792818 GP |
3483 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3484 | void *data, u16 *result) | |
f2fcfcd6 | 3485 | { |
f2fcfcd6 GP |
3486 | struct l2cap_conf_req *req = data; |
3487 | void *ptr = req->data; | |
3488 | int type, olen; | |
3489 | unsigned long val; | |
36e999a8 | 3490 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3491 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3492 | |
fe4128e0 | 3493 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3494 | |
3495 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3496 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3497 | ||
3498 | switch (type) { | |
3499 | case L2CAP_CONF_MTU: | |
3500 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3501 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3502 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3503 | } else |
0c1bc5c6 GP |
3504 | chan->imtu = val; |
3505 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3506 | break; |
3507 | ||
3508 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3509 | chan->flush_to = val; |
f2fcfcd6 | 3510 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3511 | 2, chan->flush_to); |
f2fcfcd6 GP |
3512 | break; |
3513 | ||
3514 | case L2CAP_CONF_RFC: | |
3515 | if (olen == sizeof(rfc)) | |
3516 | memcpy(&rfc, (void *)val, olen); | |
3517 | ||
c1360a1c | 3518 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3519 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3520 | return -ECONNREFUSED; |
3521 | ||
47d1ec61 | 3522 | chan->fcs = 0; |
f2fcfcd6 GP |
3523 | |
3524 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3525 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3526 | break; |
6327eb98 AE |
3527 | |
3528 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3529 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3530 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3531 | chan->tx_win); |
6327eb98 | 3532 | break; |
66af7aaf AE |
3533 | |
3534 | case L2CAP_CONF_EFS: | |
3535 | if (olen == sizeof(efs)) | |
3536 | memcpy(&efs, (void *)val, olen); | |
3537 | ||
3538 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3539 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3540 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3541 | return -ECONNREFUSED; |
3542 | ||
2d792818 GP |
3543 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3544 | (unsigned long) &efs); | |
66af7aaf | 3545 | break; |
cbabee78 AE |
3546 | |
3547 | case L2CAP_CONF_FCS: | |
3548 | if (*result == L2CAP_CONF_PENDING) | |
3549 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3550 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3551 | &chan->conf_state); |
3552 | break; | |
f2fcfcd6 GP |
3553 | } |
3554 | } | |
3555 | ||
0c1bc5c6 | 3556 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3557 | return -ECONNREFUSED; |
3558 | ||
0c1bc5c6 | 3559 | chan->mode = rfc.mode; |
6c2ea7a8 | 3560 | |
0e8b207e | 3561 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3562 | switch (rfc.mode) { |
3563 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3564 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3565 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3566 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3567 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3568 | chan->ack_win = min_t(u16, chan->ack_win, | |
3569 | rfc.txwin_size); | |
66af7aaf AE |
3570 | |
3571 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3572 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3573 | chan->local_sdu_itime = | |
2d792818 | 3574 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3575 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3576 | chan->local_flush_to = | |
2d792818 | 3577 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3578 | } |
f2fcfcd6 | 3579 | break; |
66af7aaf | 3580 | |
f2fcfcd6 | 3581 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3582 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3583 | } |
3584 | } | |
3585 | ||
fe4128e0 | 3586 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3587 | req->flags = cpu_to_le16(0); |
f2fcfcd6 GP |
3588 | |
3589 | return ptr - data; | |
3590 | } | |
3591 | ||
2d792818 GP |
3592 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3593 | u16 result, u16 flags) | |
1da177e4 LT |
3594 | { |
3595 | struct l2cap_conf_rsp *rsp = data; | |
3596 | void *ptr = rsp->data; | |
1da177e4 | 3597 | |
fe4128e0 | 3598 | BT_DBG("chan %p", chan); |
1da177e4 | 3599 | |
fe4128e0 | 3600 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3601 | rsp->result = cpu_to_le16(result); |
aca3192c | 3602 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3603 | |
3604 | return ptr - data; | |
3605 | } | |
3606 | ||
27e2d4c8 JH |
3607 | void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) |
3608 | { | |
3609 | struct l2cap_le_conn_rsp rsp; | |
3610 | struct l2cap_conn *conn = chan->conn; | |
3611 | ||
3612 | BT_DBG("chan %p", chan); | |
3613 | ||
3614 | rsp.dcid = cpu_to_le16(chan->scid); | |
3615 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 3616 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 3617 | rsp.credits = cpu_to_le16(chan->rx_credits); |
dcf4adbf | 3618 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
27e2d4c8 JH |
3619 | |
3620 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
3621 | &rsp); | |
3622 | } | |
3623 | ||
8c1d787b | 3624 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3625 | { |
3626 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3627 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3628 | u8 buf[128]; |
439f34ac | 3629 | u8 rsp_code; |
710f9b0a | 3630 | |
fe4128e0 GP |
3631 | rsp.scid = cpu_to_le16(chan->dcid); |
3632 | rsp.dcid = cpu_to_le16(chan->scid); | |
dcf4adbf JP |
3633 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3634 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3635 | |
3636 | if (chan->hs_hcon) | |
3637 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3638 | else | |
3639 | rsp_code = L2CAP_CONN_RSP; | |
3640 | ||
3641 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3642 | ||
3643 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3644 | |
c1360a1c | 3645 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3646 | return; |
3647 | ||
710f9b0a | 3648 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3649 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3650 | chan->num_conf_req++; |
3651 | } | |
3652 | ||
47d1ec61 | 3653 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3654 | { |
7b1c0049 GP |
3655 | int type, olen; |
3656 | unsigned long val; | |
c20f8e35 MM |
3657 | /* Use sane default values in case a misbehaving remote device |
3658 | * did not send an RFC or extended window size option. | |
3659 | */ | |
3660 | u16 txwin_ext = chan->ack_win; | |
3661 | struct l2cap_conf_rfc rfc = { | |
3662 | .mode = chan->mode, | |
dcf4adbf JP |
3663 | .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), |
3664 | .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
c20f8e35 MM |
3665 | .max_pdu_size = cpu_to_le16(chan->imtu), |
3666 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3667 | }; | |
7b1c0049 | 3668 | |
47d1ec61 | 3669 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3670 | |
0c1bc5c6 | 3671 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3672 | return; |
3673 | ||
3674 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3675 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3676 | ||
c20f8e35 MM |
3677 | switch (type) { |
3678 | case L2CAP_CONF_RFC: | |
3679 | if (olen == sizeof(rfc)) | |
3680 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3681 | break; |
c20f8e35 MM |
3682 | case L2CAP_CONF_EWS: |
3683 | txwin_ext = val; | |
3684 | break; | |
3685 | } | |
7b1c0049 GP |
3686 | } |
3687 | ||
7b1c0049 GP |
3688 | switch (rfc.mode) { |
3689 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3690 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3691 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3692 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3693 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3694 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3695 | else | |
3696 | chan->ack_win = min_t(u16, chan->ack_win, | |
3697 | rfc.txwin_size); | |
7b1c0049 GP |
3698 | break; |
3699 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3700 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3701 | } |
3702 | } | |
3703 | ||
2d792818 | 3704 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3705 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3706 | u8 *data) | |
4e8402a3 | 3707 | { |
e2fd318e | 3708 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3709 | |
cb3b3152 JH |
3710 | if (cmd_len < sizeof(*rej)) |
3711 | return -EPROTO; | |
3712 | ||
e2fd318e | 3713 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3714 | return 0; |
3715 | ||
3716 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3717 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3718 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3719 | |
3720 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3721 | conn->info_ident = 0; |
984947dc | 3722 | |
4e8402a3 MH |
3723 | l2cap_conn_start(conn); |
3724 | } | |
3725 | ||
3726 | return 0; | |
3727 | } | |
3728 | ||
1700915f MM |
3729 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3730 | struct l2cap_cmd_hdr *cmd, | |
3731 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3732 | { |
1da177e4 LT |
3733 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3734 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3735 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3736 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3737 | |
3738 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3739 | __le16 psm = req->psm; |
1da177e4 | 3740 | |
097db76c | 3741 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3742 | |
3743 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3744 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
bf20fd4e | 3745 | &conn->hcon->dst, ACL_LINK); |
23691d75 | 3746 | if (!pchan) { |
1da177e4 LT |
3747 | result = L2CAP_CR_BAD_PSM; |
3748 | goto sendresp; | |
3749 | } | |
3750 | ||
3df91ea2 | 3751 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3752 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3753 | |
e7c29cb1 | 3754 | /* Check if the ACL is secure enough (if not SDP) */ |
dcf4adbf | 3755 | if (psm != cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3756 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3757 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3758 | result = L2CAP_CR_SEC_BLOCK; |
3759 | goto response; | |
3760 | } | |
3761 | ||
1da177e4 LT |
3762 | result = L2CAP_CR_NO_MEM; |
3763 | ||
2dfa1003 GP |
3764 | /* Check if we already have channel with that dcid */ |
3765 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3766 | goto response; | |
3767 | ||
80b98027 | 3768 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3769 | if (!chan) |
1da177e4 LT |
3770 | goto response; |
3771 | ||
330b6c15 SS |
3772 | /* For certain devices (ex: HID mouse), support for authentication, |
3773 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3774 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3775 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3776 | */ | |
3777 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3778 | ||
7eafc59e MH |
3779 | bacpy(&chan->src, &conn->hcon->src); |
3780 | bacpy(&chan->dst, &conn->hcon->dst); | |
4f1654e0 MH |
3781 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); |
3782 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
fe4128e0 GP |
3783 | chan->psm = psm; |
3784 | chan->dcid = scid; | |
1700915f | 3785 | chan->local_amp_id = amp_id; |
1da177e4 | 3786 | |
6be36555 | 3787 | __l2cap_chan_add(conn, chan); |
48454079 | 3788 | |
fe4128e0 | 3789 | dcid = chan->scid; |
1da177e4 | 3790 | |
8d836d71 | 3791 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3792 | |
fc7f8a7e | 3793 | chan->ident = cmd->ident; |
1da177e4 | 3794 | |
984947dc | 3795 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
e7cafc45 | 3796 | if (l2cap_chan_check_security(chan, false)) { |
bdc25783 | 3797 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3798 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3799 | result = L2CAP_CR_PEND; |
3800 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3801 | chan->ops->defer(chan); |
f66dc81f | 3802 | } else { |
1700915f MM |
3803 | /* Force pending result for AMP controllers. |
3804 | * The connection will succeed after the | |
3805 | * physical link is up. | |
3806 | */ | |
6ed971ca | 3807 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3808 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3809 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3810 | } else { |
f93fa273 | 3811 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3812 | result = L2CAP_CR_PEND; |
1700915f | 3813 | } |
f66dc81f MH |
3814 | status = L2CAP_CS_NO_INFO; |
3815 | } | |
79d554a6 | 3816 | } else { |
f93fa273 | 3817 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3818 | result = L2CAP_CR_PEND; |
3819 | status = L2CAP_CS_AUTHEN_PEND; | |
3820 | } | |
3821 | } else { | |
f93fa273 | 3822 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3823 | result = L2CAP_CR_PEND; |
3824 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3825 | } |
3826 | ||
1da177e4 | 3827 | response: |
8ffb9290 | 3828 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3829 | mutex_unlock(&conn->chan_lock); |
a24cce14 | 3830 | l2cap_chan_put(pchan); |
1da177e4 LT |
3831 | |
3832 | sendresp: | |
aca3192c YH |
3833 | rsp.scid = cpu_to_le16(scid); |
3834 | rsp.dcid = cpu_to_le16(dcid); | |
3835 | rsp.result = cpu_to_le16(result); | |
3836 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3837 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3838 | |
3839 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3840 | struct l2cap_info_req info; | |
dcf4adbf | 3841 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3842 | |
3843 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3844 | conn->info_ident = l2cap_get_ident(conn); | |
3845 | ||
ba13ccd9 | 3846 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3847 | |
2d792818 GP |
3848 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3849 | sizeof(info), &info); | |
79d554a6 MH |
3850 | } |
3851 | ||
c1360a1c | 3852 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3853 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3854 | u8 buf[128]; |
c1360a1c | 3855 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3856 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3857 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3858 | chan->num_conf_req++; |
e9aeb2dd | 3859 | } |
1700915f MM |
3860 | |
3861 | return chan; | |
4c89b6aa | 3862 | } |
e9aeb2dd | 3863 | |
4c89b6aa | 3864 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3865 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3866 | { |
7b064eda JK |
3867 | struct hci_dev *hdev = conn->hcon->hdev; |
3868 | struct hci_conn *hcon = conn->hcon; | |
3869 | ||
cb3b3152 JH |
3870 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3871 | return -EPROTO; | |
3872 | ||
7b064eda JK |
3873 | hci_dev_lock(hdev); |
3874 | if (test_bit(HCI_MGMT, &hdev->dev_flags) && | |
3875 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) | |
48ec92fa | 3876 | mgmt_device_connected(hdev, hcon, 0, NULL, 0); |
7b064eda JK |
3877 | hci_dev_unlock(hdev); |
3878 | ||
300229f9 | 3879 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3880 | return 0; |
3881 | } | |
3882 | ||
5909cf30 | 3883 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3884 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3885 | u8 *data) | |
1da177e4 LT |
3886 | { |
3887 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3888 | u16 scid, dcid, result, status; | |
48454079 | 3889 | struct l2cap_chan *chan; |
1da177e4 | 3890 | u8 req[128]; |
3df91ea2 | 3891 | int err; |
1da177e4 | 3892 | |
cb3b3152 JH |
3893 | if (cmd_len < sizeof(*rsp)) |
3894 | return -EPROTO; | |
3895 | ||
1da177e4 LT |
3896 | scid = __le16_to_cpu(rsp->scid); |
3897 | dcid = __le16_to_cpu(rsp->dcid); | |
3898 | result = __le16_to_cpu(rsp->result); | |
3899 | status = __le16_to_cpu(rsp->status); | |
3900 | ||
1b009c98 | 3901 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3902 | dcid, scid, result, status); |
1da177e4 | 3903 | |
3df91ea2 AE |
3904 | mutex_lock(&conn->chan_lock); |
3905 | ||
1da177e4 | 3906 | if (scid) { |
3df91ea2 AE |
3907 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3908 | if (!chan) { | |
21870b52 | 3909 | err = -EBADSLT; |
3df91ea2 AE |
3910 | goto unlock; |
3911 | } | |
1da177e4 | 3912 | } else { |
3df91ea2 AE |
3913 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3914 | if (!chan) { | |
21870b52 | 3915 | err = -EBADSLT; |
3df91ea2 AE |
3916 | goto unlock; |
3917 | } | |
1da177e4 LT |
3918 | } |
3919 | ||
3df91ea2 AE |
3920 | err = 0; |
3921 | ||
6be36555 | 3922 | l2cap_chan_lock(chan); |
48454079 | 3923 | |
1da177e4 LT |
3924 | switch (result) { |
3925 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3926 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3927 | chan->ident = 0; |
fe4128e0 | 3928 | chan->dcid = dcid; |
c1360a1c | 3929 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3930 | |
c1360a1c | 3931 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3932 | break; |
3933 | ||
1da177e4 | 3934 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3935 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3936 | chan->num_conf_req++; |
1da177e4 LT |
3937 | break; |
3938 | ||
3939 | case L2CAP_CR_PEND: | |
c1360a1c | 3940 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3941 | break; |
3942 | ||
3943 | default: | |
48454079 | 3944 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3945 | break; |
3946 | } | |
3947 | ||
6be36555 | 3948 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3949 | |
3950 | unlock: | |
3951 | mutex_unlock(&conn->chan_lock); | |
3952 | ||
3953 | return err; | |
1da177e4 LT |
3954 | } |
3955 | ||
47d1ec61 | 3956 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3957 | { |
3958 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3959 | * sides request it. | |
3960 | */ | |
0c1bc5c6 | 3961 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3962 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 3963 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 3964 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3965 | } |
3966 | ||
29d8a590 AE |
3967 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3968 | u8 ident, u16 flags) | |
3969 | { | |
3970 | struct l2cap_conn *conn = chan->conn; | |
3971 | ||
3972 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3973 | flags); | |
3974 | ||
3975 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3976 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3977 | ||
3978 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3979 | l2cap_build_conf_rsp(chan, data, | |
3980 | L2CAP_CONF_SUCCESS, flags), data); | |
3981 | } | |
3982 | ||
662d652d JH |
3983 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
3984 | u16 scid, u16 dcid) | |
3985 | { | |
3986 | struct l2cap_cmd_rej_cid rej; | |
3987 | ||
dcf4adbf | 3988 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); |
662d652d JH |
3989 | rej.scid = __cpu_to_le16(scid); |
3990 | rej.dcid = __cpu_to_le16(dcid); | |
3991 | ||
3992 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
3993 | } | |
3994 | ||
2d792818 GP |
3995 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3996 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3997 | u8 *data) | |
1da177e4 LT |
3998 | { |
3999 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
4000 | u16 dcid, flags; | |
4001 | u8 rsp[64]; | |
48454079 | 4002 | struct l2cap_chan *chan; |
3c588192 | 4003 | int len, err = 0; |
1da177e4 | 4004 | |
cb3b3152 JH |
4005 | if (cmd_len < sizeof(*req)) |
4006 | return -EPROTO; | |
4007 | ||
1da177e4 LT |
4008 | dcid = __le16_to_cpu(req->dcid); |
4009 | flags = __le16_to_cpu(req->flags); | |
4010 | ||
4011 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
4012 | ||
baa7e1fa | 4013 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
4014 | if (!chan) { |
4015 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
4016 | return 0; | |
4017 | } | |
1da177e4 | 4018 | |
033b1142 | 4019 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
4020 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4021 | chan->dcid); | |
354f60a9 | 4022 | goto unlock; |
df6bd743 | 4023 | } |
354f60a9 | 4024 | |
5dee9e7c | 4025 | /* Reject if config buffer is too small. */ |
88219a0f | 4026 | len = cmd_len - sizeof(*req); |
cb3b3152 | 4027 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4028 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4029 | l2cap_build_conf_rsp(chan, rsp, |
4030 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4031 | goto unlock; |
4032 | } | |
4033 | ||
4034 | /* Store config. */ | |
73ffa904 GP |
4035 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4036 | chan->conf_len += len; | |
1da177e4 | 4037 | |
59e54bd1 | 4038 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4039 | /* Incomplete config. Send empty response. */ |
4040 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4041 | l2cap_build_conf_rsp(chan, rsp, |
4042 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4043 | goto unlock; |
4044 | } | |
4045 | ||
4046 | /* Complete config. */ | |
73ffa904 | 4047 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4048 | if (len < 0) { |
5e4e3972 | 4049 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4050 | goto unlock; |
f2fcfcd6 | 4051 | } |
1da177e4 | 4052 | |
1500109b | 4053 | chan->ident = cmd->ident; |
5dee9e7c | 4054 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4055 | chan->num_conf_rsp++; |
5dee9e7c | 4056 | |
5dee9e7c | 4057 | /* Reset config buffer. */ |
73ffa904 | 4058 | chan->conf_len = 0; |
5dee9e7c | 4059 | |
c1360a1c | 4060 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4061 | goto unlock; |
4062 | ||
c1360a1c | 4063 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4064 | set_default_fcs(chan); |
fcc203c3 | 4065 | |
105bdf9e MM |
4066 | if (chan->mode == L2CAP_MODE_ERTM || |
4067 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4068 | err = l2cap_ertm_init(chan); |
4069 | ||
4070 | if (err < 0) | |
5e4e3972 | 4071 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4072 | else |
4073 | l2cap_chan_ready(chan); | |
0565c1c2 | 4074 | |
876d9484 MH |
4075 | goto unlock; |
4076 | } | |
4077 | ||
c1360a1c | 4078 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4079 | u8 buf[64]; |
1da177e4 | 4080 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4081 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4082 | chan->num_conf_req++; |
1da177e4 LT |
4083 | } |
4084 | ||
0e8b207e AE |
4085 | /* Got Conf Rsp PENDING from remote side and asume we sent |
4086 | Conf Rsp PENDING in the code above */ | |
4087 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4088 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4089 | |
4090 | /* check compatibility */ | |
4091 | ||
79de886d | 4092 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4093 | if (!chan->hs_hcon) |
79de886d AE |
4094 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4095 | else | |
4096 | chan->ident = cmd->ident; | |
0e8b207e AE |
4097 | } |
4098 | ||
1da177e4 | 4099 | unlock: |
6be36555 | 4100 | l2cap_chan_unlock(chan); |
3c588192 | 4101 | return err; |
1da177e4 LT |
4102 | } |
4103 | ||
2d792818 | 4104 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4105 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4106 | u8 *data) | |
1da177e4 LT |
4107 | { |
4108 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4109 | u16 scid, flags, result; | |
48454079 | 4110 | struct l2cap_chan *chan; |
cb3b3152 | 4111 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4112 | int err = 0; |
1da177e4 | 4113 | |
cb3b3152 JH |
4114 | if (cmd_len < sizeof(*rsp)) |
4115 | return -EPROTO; | |
4116 | ||
1da177e4 LT |
4117 | scid = __le16_to_cpu(rsp->scid); |
4118 | flags = __le16_to_cpu(rsp->flags); | |
4119 | result = __le16_to_cpu(rsp->result); | |
4120 | ||
61386cba AE |
4121 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4122 | result, len); | |
1da177e4 | 4123 | |
baa7e1fa | 4124 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4125 | if (!chan) |
1da177e4 LT |
4126 | return 0; |
4127 | ||
4128 | switch (result) { | |
4129 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4130 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4131 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4132 | break; |
4133 | ||
0e8b207e AE |
4134 | case L2CAP_CONF_PENDING: |
4135 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4136 | ||
4137 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4138 | char buf[64]; | |
4139 | ||
4140 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4141 | buf, &result); |
0e8b207e | 4142 | if (len < 0) { |
5e4e3972 | 4143 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4144 | goto done; |
4145 | } | |
4146 | ||
f351bc72 | 4147 | if (!chan->hs_hcon) { |
79de886d AE |
4148 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4149 | 0); | |
5ce66b59 AE |
4150 | } else { |
4151 | if (l2cap_check_efs(chan)) { | |
4152 | amp_create_logical_link(chan); | |
4153 | chan->ident = cmd->ident; | |
4154 | } | |
4155 | } | |
0e8b207e AE |
4156 | } |
4157 | goto done; | |
4158 | ||
1da177e4 | 4159 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4160 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4161 | char req[64]; |
4162 | ||
c2c77ec8 | 4163 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4164 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4165 | goto done; |
4166 | } | |
4167 | ||
f2fcfcd6 GP |
4168 | /* throw out any old stored conf requests */ |
4169 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4170 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4171 | req, &result); |
f2fcfcd6 | 4172 | if (len < 0) { |
5e4e3972 | 4173 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4174 | goto done; |
4175 | } | |
4176 | ||
4177 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4178 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4179 | chan->num_conf_req++; |
f2fcfcd6 GP |
4180 | if (result != L2CAP_CONF_SUCCESS) |
4181 | goto done; | |
4182 | break; | |
1da177e4 LT |
4183 | } |
4184 | ||
8e87d142 | 4185 | default: |
6be36555 | 4186 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4187 | |
ba13ccd9 | 4188 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4189 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4190 | goto done; |
4191 | } | |
4192 | ||
59e54bd1 | 4193 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4194 | goto done; |
4195 | ||
c1360a1c | 4196 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4197 | |
c1360a1c | 4198 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4199 | set_default_fcs(chan); |
fcc203c3 | 4200 | |
105bdf9e MM |
4201 | if (chan->mode == L2CAP_MODE_ERTM || |
4202 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4203 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4204 | |
3c588192 | 4205 | if (err < 0) |
5e4e3972 | 4206 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4207 | else |
4208 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4209 | } |
4210 | ||
4211 | done: | |
6be36555 | 4212 | l2cap_chan_unlock(chan); |
3c588192 | 4213 | return err; |
1da177e4 LT |
4214 | } |
4215 | ||
2d792818 | 4216 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4217 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4218 | u8 *data) | |
1da177e4 LT |
4219 | { |
4220 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4221 | struct l2cap_disconn_rsp rsp; | |
4222 | u16 dcid, scid; | |
48454079 | 4223 | struct l2cap_chan *chan; |
1da177e4 | 4224 | |
cb3b3152 JH |
4225 | if (cmd_len != sizeof(*req)) |
4226 | return -EPROTO; | |
4227 | ||
1da177e4 LT |
4228 | scid = __le16_to_cpu(req->scid); |
4229 | dcid = __le16_to_cpu(req->dcid); | |
4230 | ||
4231 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4232 | ||
3df91ea2 AE |
4233 | mutex_lock(&conn->chan_lock); |
4234 | ||
4235 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4236 | if (!chan) { | |
4237 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4238 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4239 | return 0; | |
3df91ea2 | 4240 | } |
1da177e4 | 4241 | |
6be36555 AE |
4242 | l2cap_chan_lock(chan); |
4243 | ||
fe4128e0 GP |
4244 | rsp.dcid = cpu_to_le16(chan->scid); |
4245 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4246 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4247 | ||
5ec1bbe5 | 4248 | chan->ops->set_shutdown(chan); |
1da177e4 | 4249 | |
61d6ef3e | 4250 | l2cap_chan_hold(chan); |
48454079 | 4251 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4252 | |
4253 | l2cap_chan_unlock(chan); | |
1da177e4 | 4254 | |
80b98027 | 4255 | chan->ops->close(chan); |
61d6ef3e | 4256 | l2cap_chan_put(chan); |
3df91ea2 AE |
4257 | |
4258 | mutex_unlock(&conn->chan_lock); | |
4259 | ||
1da177e4 LT |
4260 | return 0; |
4261 | } | |
4262 | ||
2d792818 | 4263 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4264 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4265 | u8 *data) | |
1da177e4 LT |
4266 | { |
4267 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4268 | u16 dcid, scid; | |
48454079 | 4269 | struct l2cap_chan *chan; |
1da177e4 | 4270 | |
cb3b3152 JH |
4271 | if (cmd_len != sizeof(*rsp)) |
4272 | return -EPROTO; | |
4273 | ||
1da177e4 LT |
4274 | scid = __le16_to_cpu(rsp->scid); |
4275 | dcid = __le16_to_cpu(rsp->dcid); | |
4276 | ||
4277 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4278 | ||
3df91ea2 AE |
4279 | mutex_lock(&conn->chan_lock); |
4280 | ||
4281 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4282 | if (!chan) { | |
4283 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4284 | return 0; |
3df91ea2 | 4285 | } |
1da177e4 | 4286 | |
6be36555 | 4287 | l2cap_chan_lock(chan); |
48454079 | 4288 | |
61d6ef3e | 4289 | l2cap_chan_hold(chan); |
48454079 | 4290 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4291 | |
4292 | l2cap_chan_unlock(chan); | |
1da177e4 | 4293 | |
80b98027 | 4294 | chan->ops->close(chan); |
61d6ef3e | 4295 | l2cap_chan_put(chan); |
3df91ea2 AE |
4296 | |
4297 | mutex_unlock(&conn->chan_lock); | |
4298 | ||
1da177e4 LT |
4299 | return 0; |
4300 | } | |
4301 | ||
2d792818 | 4302 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4303 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4304 | u8 *data) | |
1da177e4 LT |
4305 | { |
4306 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4307 | u16 type; |
4308 | ||
cb3b3152 JH |
4309 | if (cmd_len != sizeof(*req)) |
4310 | return -EPROTO; | |
4311 | ||
1da177e4 LT |
4312 | type = __le16_to_cpu(req->type); |
4313 | ||
4314 | BT_DBG("type 0x%4.4x", type); | |
4315 | ||
f0709e03 MH |
4316 | if (type == L2CAP_IT_FEAT_MASK) { |
4317 | u8 buf[8]; | |
44dd46de | 4318 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4319 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
dcf4adbf JP |
4320 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4321 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4322 | if (!disable_ertm) |
fcc203c3 | 4323 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4324 | | L2CAP_FEAT_FCS; |
848566b3 | 4325 | if (conn->hs_enabled) |
6327eb98 | 4326 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4327 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4328 | |
1b7bf4ed | 4329 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4330 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4331 | buf); | |
e1027a7c MH |
4332 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4333 | u8 buf[12]; | |
4334 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4335 | |
848566b3 | 4336 | if (conn->hs_enabled) |
50a147cd MM |
4337 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; |
4338 | else | |
4339 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4340 | ||
dcf4adbf JP |
4341 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4342 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4343 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4344 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4345 | buf); | |
f0709e03 MH |
4346 | } else { |
4347 | struct l2cap_info_rsp rsp; | |
4348 | rsp.type = cpu_to_le16(type); | |
dcf4adbf | 4349 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4350 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4351 | &rsp); | |
f0709e03 | 4352 | } |
1da177e4 LT |
4353 | |
4354 | return 0; | |
4355 | } | |
4356 | ||
2d792818 | 4357 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4358 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4359 | u8 *data) | |
1da177e4 LT |
4360 | { |
4361 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4362 | u16 type, result; | |
4363 | ||
3f6fa3d4 | 4364 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4365 | return -EPROTO; |
4366 | ||
1da177e4 LT |
4367 | type = __le16_to_cpu(rsp->type); |
4368 | result = __le16_to_cpu(rsp->result); | |
4369 | ||
4370 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4371 | ||
e90165be AE |
4372 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4373 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4374 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4375 | return 0; |
4376 | ||
17cd3f37 | 4377 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4378 | |
adb08ede VT |
4379 | if (result != L2CAP_IR_SUCCESS) { |
4380 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4381 | conn->info_ident = 0; | |
4382 | ||
4383 | l2cap_conn_start(conn); | |
4384 | ||
4385 | return 0; | |
4386 | } | |
4387 | ||
978c93b9 AE |
4388 | switch (type) { |
4389 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4390 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4391 | |
47ec1dcd | 4392 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4393 | struct l2cap_info_req req; |
dcf4adbf | 4394 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4395 | |
4396 | conn->info_ident = l2cap_get_ident(conn); | |
4397 | ||
4398 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4399 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4400 | } else { |
4401 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4402 | conn->info_ident = 0; | |
4403 | ||
4404 | l2cap_conn_start(conn); | |
4405 | } | |
978c93b9 AE |
4406 | break; |
4407 | ||
4408 | case L2CAP_IT_FIXED_CHAN: | |
4409 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4410 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4411 | conn->info_ident = 0; |
984947dc MH |
4412 | |
4413 | l2cap_conn_start(conn); | |
978c93b9 | 4414 | break; |
984947dc | 4415 | } |
4e8402a3 | 4416 | |
1da177e4 LT |
4417 | return 0; |
4418 | } | |
4419 | ||
1700915f MM |
4420 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4421 | struct l2cap_cmd_hdr *cmd, | |
4422 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4423 | { |
4424 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4425 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4426 | struct l2cap_chan *chan; |
6e1df6a6 | 4427 | struct hci_dev *hdev; |
f94ff6ff MM |
4428 | u16 psm, scid; |
4429 | ||
4430 | if (cmd_len != sizeof(*req)) | |
4431 | return -EPROTO; | |
4432 | ||
848566b3 | 4433 | if (!conn->hs_enabled) |
f94ff6ff MM |
4434 | return -EINVAL; |
4435 | ||
4436 | psm = le16_to_cpu(req->psm); | |
4437 | scid = le16_to_cpu(req->scid); | |
4438 | ||
ad0ac6ca | 4439 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4440 | |
6e1df6a6 | 4441 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4442 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4443 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4444 | req->amp_id); | |
4445 | return 0; | |
4446 | } | |
1700915f | 4447 | |
6e1df6a6 AE |
4448 | /* Validate AMP controller id */ |
4449 | hdev = hci_dev_get(req->amp_id); | |
4450 | if (!hdev) | |
4451 | goto error; | |
1700915f | 4452 | |
6e1df6a6 AE |
4453 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4454 | hci_dev_put(hdev); | |
4455 | goto error; | |
4456 | } | |
1700915f | 4457 | |
6e1df6a6 AE |
4458 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4459 | req->amp_id); | |
4460 | if (chan) { | |
4461 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4462 | struct hci_conn *hs_hcon; | |
1700915f | 4463 | |
98e0f7ea MH |
4464 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4465 | &conn->hcon->dst); | |
6e1df6a6 AE |
4466 | if (!hs_hcon) { |
4467 | hci_dev_put(hdev); | |
662d652d JH |
4468 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4469 | chan->dcid); | |
4470 | return 0; | |
1700915f MM |
4471 | } |
4472 | ||
6e1df6a6 AE |
4473 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4474 | ||
6e1df6a6 AE |
4475 | mgr->bredr_chan = chan; |
4476 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4477 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4478 | conn->mtu = hdev->block_mtu; |
1700915f | 4479 | } |
f94ff6ff | 4480 | |
6e1df6a6 | 4481 | hci_dev_put(hdev); |
f94ff6ff MM |
4482 | |
4483 | return 0; | |
6e1df6a6 AE |
4484 | |
4485 | error: | |
4486 | rsp.dcid = 0; | |
4487 | rsp.scid = cpu_to_le16(scid); | |
dcf4adbf JP |
4488 | rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); |
4489 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
6e1df6a6 AE |
4490 | |
4491 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4492 | sizeof(rsp), &rsp); | |
4493 | ||
dc280801 | 4494 | return 0; |
f94ff6ff MM |
4495 | } |
4496 | ||
8eb200bd MM |
4497 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4498 | { | |
4499 | struct l2cap_move_chan_req req; | |
4500 | u8 ident; | |
4501 | ||
4502 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4503 | ||
4504 | ident = l2cap_get_ident(chan->conn); | |
4505 | chan->ident = ident; | |
4506 | ||
4507 | req.icid = cpu_to_le16(chan->scid); | |
4508 | req.dest_amp_id = dest_amp_id; | |
4509 | ||
4510 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4511 | &req); | |
4512 | ||
4513 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4514 | } | |
4515 | ||
1500109b | 4516 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4517 | { |
4518 | struct l2cap_move_chan_rsp rsp; | |
4519 | ||
1500109b | 4520 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4521 | |
1500109b | 4522 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4523 | rsp.result = cpu_to_le16(result); |
4524 | ||
1500109b MM |
4525 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4526 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4527 | } |
4528 | ||
5b155ef9 | 4529 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4530 | { |
4531 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4532 | |
5b155ef9 | 4533 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4534 | |
5b155ef9 | 4535 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4536 | |
5b155ef9 | 4537 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4538 | cfm.result = cpu_to_le16(result); |
4539 | ||
5b155ef9 MM |
4540 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4541 | sizeof(cfm), &cfm); | |
4542 | ||
4543 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4544 | } | |
4545 | ||
4546 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4547 | { | |
4548 | struct l2cap_move_chan_cfm cfm; | |
4549 | ||
4550 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4551 | ||
4552 | cfm.icid = cpu_to_le16(icid); | |
dcf4adbf | 4553 | cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); |
5b155ef9 MM |
4554 | |
4555 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4556 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4557 | } |
4558 | ||
4559 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4560 | u16 icid) |
8d5a04a1 MM |
4561 | { |
4562 | struct l2cap_move_chan_cfm_rsp rsp; | |
4563 | ||
ad0ac6ca | 4564 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4565 | |
4566 | rsp.icid = cpu_to_le16(icid); | |
4567 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4568 | } | |
4569 | ||
5f3847a4 MM |
4570 | static void __release_logical_link(struct l2cap_chan *chan) |
4571 | { | |
4572 | chan->hs_hchan = NULL; | |
4573 | chan->hs_hcon = NULL; | |
4574 | ||
4575 | /* Placeholder - release the logical link */ | |
4576 | } | |
4577 | ||
1500109b MM |
4578 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4579 | { | |
4580 | /* Logical link setup failed */ | |
4581 | if (chan->state != BT_CONNECTED) { | |
4582 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4583 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4584 | return; |
4585 | } | |
4586 | ||
4587 | switch (chan->move_role) { | |
4588 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4589 | l2cap_move_done(chan); | |
4590 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4591 | break; | |
4592 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4593 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4594 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4595 | /* Remote has only sent pending or | |
4596 | * success responses, clean up | |
4597 | */ | |
4598 | l2cap_move_done(chan); | |
4599 | } | |
4600 | ||
4601 | /* Other amp move states imply that the move | |
4602 | * has already aborted | |
4603 | */ | |
4604 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4605 | break; | |
4606 | } | |
4607 | } | |
4608 | ||
4609 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4610 | struct hci_chan *hchan) | |
4611 | { | |
4612 | struct l2cap_conf_rsp rsp; | |
1500109b | 4613 | |
336178a3 | 4614 | chan->hs_hchan = hchan; |
1500109b MM |
4615 | chan->hs_hcon->l2cap_data = chan->conn; |
4616 | ||
35ba9561 | 4617 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4618 | |
4619 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4620 | int err; |
1500109b MM |
4621 | |
4622 | set_default_fcs(chan); | |
4623 | ||
4624 | err = l2cap_ertm_init(chan); | |
4625 | if (err < 0) | |
5e4e3972 | 4626 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4627 | else |
4628 | l2cap_chan_ready(chan); | |
4629 | } | |
4630 | } | |
4631 | ||
4632 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4633 | struct hci_chan *hchan) | |
4634 | { | |
4635 | chan->hs_hcon = hchan->conn; | |
4636 | chan->hs_hcon->l2cap_data = chan->conn; | |
4637 | ||
4638 | BT_DBG("move_state %d", chan->move_state); | |
4639 | ||
4640 | switch (chan->move_state) { | |
4641 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4642 | /* Move confirm will be sent after a success | |
4643 | * response is received | |
4644 | */ | |
4645 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4646 | break; | |
4647 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4648 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4649 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4650 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4651 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4652 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4653 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4654 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4655 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4656 | } | |
4657 | break; | |
4658 | default: | |
4659 | /* Move was not in expected state, free the channel */ | |
4660 | __release_logical_link(chan); | |
4661 | ||
4662 | chan->move_state = L2CAP_MOVE_STABLE; | |
4663 | } | |
4664 | } | |
4665 | ||
4666 | /* Call with chan locked */ | |
27695fb4 AE |
4667 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4668 | u8 status) | |
5b155ef9 | 4669 | { |
1500109b MM |
4670 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4671 | ||
4672 | if (status) { | |
4673 | l2cap_logical_fail(chan); | |
4674 | __release_logical_link(chan); | |
4675 | return; | |
4676 | } | |
4677 | ||
4678 | if (chan->state != BT_CONNECTED) { | |
4679 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4680 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4681 | l2cap_logical_finish_create(chan, hchan); |
4682 | } else { | |
4683 | l2cap_logical_finish_move(chan, hchan); | |
4684 | } | |
5b155ef9 MM |
4685 | } |
4686 | ||
3f7a56c4 MM |
4687 | void l2cap_move_start(struct l2cap_chan *chan) |
4688 | { | |
4689 | BT_DBG("chan %p", chan); | |
4690 | ||
6ed971ca | 4691 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4692 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4693 | return; | |
4694 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4695 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4696 | /* Placeholder - start physical link setup */ | |
4697 | } else { | |
4698 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4699 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4700 | chan->move_id = 0; | |
4701 | l2cap_move_setup(chan); | |
4702 | l2cap_send_move_chan_req(chan, 0); | |
4703 | } | |
4704 | } | |
4705 | ||
8eb200bd MM |
4706 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4707 | u8 local_amp_id, u8 remote_amp_id) | |
4708 | { | |
62748ca1 AE |
4709 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4710 | local_amp_id, remote_amp_id); | |
4711 | ||
12d6cc60 AE |
4712 | chan->fcs = L2CAP_FCS_NONE; |
4713 | ||
62748ca1 AE |
4714 | /* Outgoing channel on AMP */ |
4715 | if (chan->state == BT_CONNECT) { | |
4716 | if (result == L2CAP_CR_SUCCESS) { | |
4717 | chan->local_amp_id = local_amp_id; | |
4718 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4719 | } else { | |
4720 | /* Revert to BR/EDR connect */ | |
4721 | l2cap_send_conn_req(chan); | |
4722 | } | |
4723 | ||
4724 | return; | |
4725 | } | |
4726 | ||
4727 | /* Incoming channel on AMP */ | |
4728 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4729 | struct l2cap_conn_rsp rsp; |
4730 | char buf[128]; | |
4731 | rsp.scid = cpu_to_le16(chan->dcid); | |
4732 | rsp.dcid = cpu_to_le16(chan->scid); | |
4733 | ||
8eb200bd MM |
4734 | if (result == L2CAP_CR_SUCCESS) { |
4735 | /* Send successful response */ | |
dcf4adbf JP |
4736 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
4737 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4738 | } else { |
4739 | /* Send negative response */ | |
dcf4adbf JP |
4740 | rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); |
4741 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4742 | } |
4743 | ||
4744 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4745 | sizeof(rsp), &rsp); | |
4746 | ||
4747 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4748 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4749 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4750 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4751 | L2CAP_CONF_REQ, | |
4752 | l2cap_build_conf_req(chan, buf), buf); | |
4753 | chan->num_conf_req++; | |
4754 | } | |
8eb200bd MM |
4755 | } |
4756 | } | |
4757 | ||
4758 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4759 | u8 remote_amp_id) | |
4760 | { | |
4761 | l2cap_move_setup(chan); | |
4762 | chan->move_id = local_amp_id; | |
4763 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4764 | ||
4765 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4766 | } | |
4767 | ||
4768 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4769 | { | |
4770 | struct hci_chan *hchan = NULL; | |
4771 | ||
4772 | /* Placeholder - get hci_chan for logical link */ | |
4773 | ||
4774 | if (hchan) { | |
4775 | if (hchan->state == BT_CONNECTED) { | |
4776 | /* Logical link is ready to go */ | |
4777 | chan->hs_hcon = hchan->conn; | |
4778 | chan->hs_hcon->l2cap_data = chan->conn; | |
4779 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4780 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4781 | ||
4782 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4783 | } else { | |
4784 | /* Wait for logical link to be ready */ | |
4785 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4786 | } | |
4787 | } else { | |
4788 | /* Logical link not available */ | |
4789 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4790 | } | |
4791 | } | |
4792 | ||
4793 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4794 | { | |
4795 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4796 | u8 rsp_result; | |
4797 | if (result == -EINVAL) | |
4798 | rsp_result = L2CAP_MR_BAD_ID; | |
4799 | else | |
4800 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4801 | ||
4802 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4803 | } | |
4804 | ||
4805 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4806 | chan->move_state = L2CAP_MOVE_STABLE; | |
4807 | ||
4808 | /* Restart data transmission */ | |
4809 | l2cap_ertm_send(chan); | |
4810 | } | |
4811 | ||
a514b17f AE |
4812 | /* Invoke with locked chan */ |
4813 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4814 | { |
770bfefa | 4815 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4816 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4817 | |
8eb200bd MM |
4818 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4819 | chan, result, local_amp_id, remote_amp_id); | |
4820 | ||
8eb200bd MM |
4821 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4822 | l2cap_chan_unlock(chan); | |
4823 | return; | |
4824 | } | |
4825 | ||
4826 | if (chan->state != BT_CONNECTED) { | |
4827 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4828 | } else if (result != L2CAP_MR_SUCCESS) { | |
4829 | l2cap_do_move_cancel(chan, result); | |
4830 | } else { | |
4831 | switch (chan->move_role) { | |
4832 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4833 | l2cap_do_move_initiate(chan, local_amp_id, | |
4834 | remote_amp_id); | |
4835 | break; | |
4836 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4837 | l2cap_do_move_respond(chan, result); | |
4838 | break; | |
4839 | default: | |
4840 | l2cap_do_move_cancel(chan, result); | |
4841 | break; | |
4842 | } | |
4843 | } | |
8eb200bd MM |
4844 | } |
4845 | ||
8d5a04a1 | 4846 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4847 | struct l2cap_cmd_hdr *cmd, |
4848 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4849 | { |
4850 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4851 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4852 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4853 | u16 icid = 0; |
4854 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4855 | ||
4856 | if (cmd_len != sizeof(*req)) | |
4857 | return -EPROTO; | |
4858 | ||
4859 | icid = le16_to_cpu(req->icid); | |
4860 | ||
ad0ac6ca | 4861 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4862 | |
848566b3 | 4863 | if (!conn->hs_enabled) |
8d5a04a1 MM |
4864 | return -EINVAL; |
4865 | ||
02b0fbb9 MM |
4866 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4867 | if (!chan) { | |
1500109b | 4868 | rsp.icid = cpu_to_le16(icid); |
dcf4adbf | 4869 | rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); |
1500109b MM |
4870 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, |
4871 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4872 | return 0; |
4873 | } | |
4874 | ||
1500109b MM |
4875 | chan->ident = cmd->ident; |
4876 | ||
02b0fbb9 MM |
4877 | if (chan->scid < L2CAP_CID_DYN_START || |
4878 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4879 | (chan->mode != L2CAP_MODE_ERTM && | |
4880 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4881 | result = L2CAP_MR_NOT_ALLOWED; | |
4882 | goto send_move_response; | |
4883 | } | |
4884 | ||
4885 | if (chan->local_amp_id == req->dest_amp_id) { | |
4886 | result = L2CAP_MR_SAME_ID; | |
4887 | goto send_move_response; | |
4888 | } | |
4889 | ||
6ed971ca | 4890 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4891 | struct hci_dev *hdev; |
4892 | hdev = hci_dev_get(req->dest_amp_id); | |
4893 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4894 | !test_bit(HCI_UP, &hdev->flags)) { | |
4895 | if (hdev) | |
4896 | hci_dev_put(hdev); | |
4897 | ||
4898 | result = L2CAP_MR_BAD_ID; | |
4899 | goto send_move_response; | |
4900 | } | |
4901 | hci_dev_put(hdev); | |
4902 | } | |
4903 | ||
4904 | /* Detect a move collision. Only send a collision response | |
4905 | * if this side has "lost", otherwise proceed with the move. | |
4906 | * The winner has the larger bd_addr. | |
4907 | */ | |
4908 | if ((__chan_is_moving(chan) || | |
4909 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4910 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4911 | result = L2CAP_MR_COLLISION; |
4912 | goto send_move_response; | |
4913 | } | |
4914 | ||
02b0fbb9 MM |
4915 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4916 | l2cap_move_setup(chan); | |
4917 | chan->move_id = req->dest_amp_id; | |
4918 | icid = chan->dcid; | |
4919 | ||
6ed971ca | 4920 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4921 | /* Moving to BR/EDR */ |
4922 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4923 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4924 | result = L2CAP_MR_PEND; | |
4925 | } else { | |
4926 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4927 | result = L2CAP_MR_SUCCESS; | |
4928 | } | |
4929 | } else { | |
4930 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4931 | /* Placeholder - uncomment when amp functions are available */ | |
4932 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4933 | result = L2CAP_MR_PEND; | |
4934 | } | |
4935 | ||
4936 | send_move_response: | |
1500109b | 4937 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4938 | |
02b0fbb9 MM |
4939 | l2cap_chan_unlock(chan); |
4940 | ||
8d5a04a1 MM |
4941 | return 0; |
4942 | } | |
4943 | ||
5b155ef9 MM |
4944 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4945 | { | |
4946 | struct l2cap_chan *chan; | |
4947 | struct hci_chan *hchan = NULL; | |
4948 | ||
4949 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4950 | if (!chan) { | |
4951 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4952 | return; | |
4953 | } | |
4954 | ||
4955 | __clear_chan_timer(chan); | |
4956 | if (result == L2CAP_MR_PEND) | |
4957 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4958 | ||
4959 | switch (chan->move_state) { | |
4960 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4961 | /* Move confirm will be sent when logical link | |
4962 | * is complete. | |
4963 | */ | |
4964 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4965 | break; | |
4966 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4967 | if (result == L2CAP_MR_PEND) { | |
4968 | break; | |
4969 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4970 | &chan->conn_state)) { | |
4971 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4972 | } else { | |
4973 | /* Logical link is up or moving to BR/EDR, | |
4974 | * proceed with move | |
4975 | */ | |
4976 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4977 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4978 | } | |
4979 | break; | |
4980 | case L2CAP_MOVE_WAIT_RSP: | |
4981 | /* Moving to AMP */ | |
4982 | if (result == L2CAP_MR_SUCCESS) { | |
4983 | /* Remote is ready, send confirm immediately | |
4984 | * after logical link is ready | |
4985 | */ | |
4986 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4987 | } else { | |
4988 | /* Both logical link and move success | |
4989 | * are required to confirm | |
4990 | */ | |
4991 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
4992 | } | |
4993 | ||
4994 | /* Placeholder - get hci_chan for logical link */ | |
4995 | if (!hchan) { | |
4996 | /* Logical link not available */ | |
4997 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4998 | break; | |
4999 | } | |
5000 | ||
5001 | /* If the logical link is not yet connected, do not | |
5002 | * send confirmation. | |
5003 | */ | |
5004 | if (hchan->state != BT_CONNECTED) | |
5005 | break; | |
5006 | ||
5007 | /* Logical link is already ready to go */ | |
5008 | ||
5009 | chan->hs_hcon = hchan->conn; | |
5010 | chan->hs_hcon->l2cap_data = chan->conn; | |
5011 | ||
5012 | if (result == L2CAP_MR_SUCCESS) { | |
5013 | /* Can confirm now */ | |
5014 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5015 | } else { | |
5016 | /* Now only need move success | |
5017 | * to confirm | |
5018 | */ | |
5019 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
5020 | } | |
5021 | ||
5022 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
5023 | break; | |
5024 | default: | |
5025 | /* Any other amp move state means the move failed. */ | |
5026 | chan->move_id = chan->local_amp_id; | |
5027 | l2cap_move_done(chan); | |
5028 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5029 | } | |
5030 | ||
5031 | l2cap_chan_unlock(chan); | |
5032 | } | |
5033 | ||
5034 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5035 | u16 result) | |
5036 | { | |
5037 | struct l2cap_chan *chan; | |
5038 | ||
5039 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5040 | if (!chan) { | |
5041 | /* Could not locate channel, icid is best guess */ | |
5042 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5043 | return; | |
5044 | } | |
5045 | ||
5046 | __clear_chan_timer(chan); | |
5047 | ||
5048 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5049 | if (result == L2CAP_MR_COLLISION) { | |
5050 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5051 | } else { | |
5052 | /* Cleanup - cancel move */ | |
5053 | chan->move_id = chan->local_amp_id; | |
5054 | l2cap_move_done(chan); | |
5055 | } | |
5056 | } | |
5057 | ||
5058 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5059 | ||
5060 | l2cap_chan_unlock(chan); | |
5061 | } | |
5062 | ||
5063 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5064 | struct l2cap_cmd_hdr *cmd, | |
5065 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5066 | { |
5067 | struct l2cap_move_chan_rsp *rsp = data; | |
5068 | u16 icid, result; | |
5069 | ||
5070 | if (cmd_len != sizeof(*rsp)) | |
5071 | return -EPROTO; | |
5072 | ||
5073 | icid = le16_to_cpu(rsp->icid); | |
5074 | result = le16_to_cpu(rsp->result); | |
5075 | ||
ad0ac6ca | 5076 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5077 | |
5b155ef9 MM |
5078 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5079 | l2cap_move_continue(conn, icid, result); | |
5080 | else | |
5081 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5082 | |
5083 | return 0; | |
5084 | } | |
5085 | ||
5f3847a4 MM |
5086 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5087 | struct l2cap_cmd_hdr *cmd, | |
5088 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5089 | { |
5090 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5091 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5092 | u16 icid, result; |
5093 | ||
5094 | if (cmd_len != sizeof(*cfm)) | |
5095 | return -EPROTO; | |
5096 | ||
5097 | icid = le16_to_cpu(cfm->icid); | |
5098 | result = le16_to_cpu(cfm->result); | |
5099 | ||
ad0ac6ca | 5100 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5101 | |
5f3847a4 MM |
5102 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5103 | if (!chan) { | |
5104 | /* Spec requires a response even if the icid was not found */ | |
5105 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5106 | return 0; | |
5107 | } | |
5108 | ||
5109 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5110 | if (result == L2CAP_MC_CONFIRMED) { | |
5111 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5112 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5113 | __release_logical_link(chan); |
5114 | } else { | |
5115 | chan->move_id = chan->local_amp_id; | |
5116 | } | |
5117 | ||
5118 | l2cap_move_done(chan); | |
5119 | } | |
5120 | ||
8d5a04a1 MM |
5121 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5122 | ||
5f3847a4 MM |
5123 | l2cap_chan_unlock(chan); |
5124 | ||
8d5a04a1 MM |
5125 | return 0; |
5126 | } | |
5127 | ||
5128 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5129 | struct l2cap_cmd_hdr *cmd, |
5130 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5131 | { |
5132 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5133 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5134 | u16 icid; |
5135 | ||
5136 | if (cmd_len != sizeof(*rsp)) | |
5137 | return -EPROTO; | |
5138 | ||
5139 | icid = le16_to_cpu(rsp->icid); | |
5140 | ||
ad0ac6ca | 5141 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5142 | |
3fd71a0a MM |
5143 | chan = l2cap_get_chan_by_scid(conn, icid); |
5144 | if (!chan) | |
5145 | return 0; | |
5146 | ||
5147 | __clear_chan_timer(chan); | |
5148 | ||
5149 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5150 | chan->local_amp_id = chan->move_id; | |
5151 | ||
6ed971ca | 5152 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5153 | __release_logical_link(chan); |
5154 | ||
5155 | l2cap_move_done(chan); | |
5156 | } | |
5157 | ||
5158 | l2cap_chan_unlock(chan); | |
5159 | ||
8d5a04a1 MM |
5160 | return 0; |
5161 | } | |
5162 | ||
de73115a | 5163 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, |
2d792818 | 5164 | struct l2cap_cmd_hdr *cmd, |
203e639e | 5165 | u16 cmd_len, u8 *data) |
de73115a CT |
5166 | { |
5167 | struct hci_conn *hcon = conn->hcon; | |
5168 | struct l2cap_conn_param_update_req *req; | |
5169 | struct l2cap_conn_param_update_rsp rsp; | |
203e639e | 5170 | u16 min, max, latency, to_multiplier; |
2ce603eb | 5171 | int err; |
de73115a | 5172 | |
40bef302 | 5173 | if (hcon->role != HCI_ROLE_MASTER) |
de73115a CT |
5174 | return -EINVAL; |
5175 | ||
de73115a CT |
5176 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5177 | return -EPROTO; | |
5178 | ||
5179 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5180 | min = __le16_to_cpu(req->min); |
5181 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5182 | latency = __le16_to_cpu(req->latency); |
5183 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5184 | ||
5185 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5186 | min, max, latency, to_multiplier); |
de73115a CT |
5187 | |
5188 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb | 5189 | |
d4905f24 | 5190 | err = hci_check_conn_params(min, max, latency, to_multiplier); |
2ce603eb | 5191 | if (err) |
dcf4adbf | 5192 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5193 | else |
dcf4adbf | 5194 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5195 | |
5196 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5197 | sizeof(rsp), &rsp); |
de73115a | 5198 | |
ffb5a827 | 5199 | if (!err) { |
f4869e2a JH |
5200 | u8 store_hint; |
5201 | ||
5202 | store_hint = hci_le_conn_update(hcon, min, max, latency, | |
5203 | to_multiplier); | |
ffb5a827 | 5204 | mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type, |
f4869e2a JH |
5205 | store_hint, min, max, latency, |
5206 | to_multiplier); | |
ffb5a827 | 5207 | |
ffb5a827 | 5208 | } |
2ce603eb | 5209 | |
de73115a CT |
5210 | return 0; |
5211 | } | |
5212 | ||
f1496dee JH |
5213 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5214 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5215 | u8 *data) | |
5216 | { | |
5217 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; | |
5218 | u16 dcid, mtu, mps, credits, result; | |
5219 | struct l2cap_chan *chan; | |
5220 | int err; | |
5221 | ||
5222 | if (cmd_len < sizeof(*rsp)) | |
5223 | return -EPROTO; | |
5224 | ||
5225 | dcid = __le16_to_cpu(rsp->dcid); | |
5226 | mtu = __le16_to_cpu(rsp->mtu); | |
5227 | mps = __le16_to_cpu(rsp->mps); | |
5228 | credits = __le16_to_cpu(rsp->credits); | |
5229 | result = __le16_to_cpu(rsp->result); | |
5230 | ||
5231 | if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) | |
5232 | return -EPROTO; | |
5233 | ||
5234 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", | |
5235 | dcid, mtu, mps, credits, result); | |
5236 | ||
5237 | mutex_lock(&conn->chan_lock); | |
5238 | ||
5239 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5240 | if (!chan) { | |
5241 | err = -EBADSLT; | |
5242 | goto unlock; | |
5243 | } | |
5244 | ||
5245 | err = 0; | |
5246 | ||
5247 | l2cap_chan_lock(chan); | |
5248 | ||
5249 | switch (result) { | |
5250 | case L2CAP_CR_SUCCESS: | |
5251 | chan->ident = 0; | |
5252 | chan->dcid = dcid; | |
5253 | chan->omtu = mtu; | |
5254 | chan->remote_mps = mps; | |
0cd75f7e | 5255 | chan->tx_credits = credits; |
f1496dee JH |
5256 | l2cap_chan_ready(chan); |
5257 | break; | |
5258 | ||
5259 | default: | |
5260 | l2cap_chan_del(chan, ECONNREFUSED); | |
5261 | break; | |
5262 | } | |
5263 | ||
5264 | l2cap_chan_unlock(chan); | |
5265 | ||
5266 | unlock: | |
5267 | mutex_unlock(&conn->chan_lock); | |
5268 | ||
5269 | return err; | |
5270 | } | |
5271 | ||
3300d9a9 | 5272 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5273 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5274 | u8 *data) | |
3300d9a9 CT |
5275 | { |
5276 | int err = 0; | |
5277 | ||
5278 | switch (cmd->code) { | |
5279 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5280 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5281 | break; |
5282 | ||
5283 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5284 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5285 | break; |
5286 | ||
5287 | case L2CAP_CONN_RSP: | |
f5a2598d | 5288 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5289 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5290 | break; |
5291 | ||
5292 | case L2CAP_CONF_REQ: | |
5293 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5294 | break; | |
5295 | ||
5296 | case L2CAP_CONF_RSP: | |
9245e737 | 5297 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5298 | break; |
5299 | ||
5300 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5301 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5302 | break; |
5303 | ||
5304 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5305 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5306 | break; |
5307 | ||
5308 | case L2CAP_ECHO_REQ: | |
5309 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5310 | break; | |
5311 | ||
5312 | case L2CAP_ECHO_RSP: | |
5313 | break; | |
5314 | ||
5315 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5316 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5317 | break; |
5318 | ||
5319 | case L2CAP_INFO_RSP: | |
9245e737 | 5320 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5321 | break; |
5322 | ||
f94ff6ff MM |
5323 | case L2CAP_CREATE_CHAN_REQ: |
5324 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5325 | break; | |
5326 | ||
8d5a04a1 MM |
5327 | case L2CAP_MOVE_CHAN_REQ: |
5328 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5329 | break; | |
5330 | ||
5331 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5332 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5333 | break; |
5334 | ||
5335 | case L2CAP_MOVE_CHAN_CFM: | |
5336 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5337 | break; | |
5338 | ||
5339 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5340 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5341 | break; |
5342 | ||
3300d9a9 CT |
5343 | default: |
5344 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5345 | err = -EINVAL; | |
5346 | break; | |
5347 | } | |
5348 | ||
5349 | return err; | |
5350 | } | |
5351 | ||
27e2d4c8 JH |
5352 | static int l2cap_le_connect_req(struct l2cap_conn *conn, |
5353 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5354 | u8 *data) | |
5355 | { | |
5356 | struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; | |
5357 | struct l2cap_le_conn_rsp rsp; | |
5358 | struct l2cap_chan *chan, *pchan; | |
0cd75f7e | 5359 | u16 dcid, scid, credits, mtu, mps; |
27e2d4c8 JH |
5360 | __le16 psm; |
5361 | u8 result; | |
5362 | ||
5363 | if (cmd_len != sizeof(*req)) | |
5364 | return -EPROTO; | |
5365 | ||
5366 | scid = __le16_to_cpu(req->scid); | |
5367 | mtu = __le16_to_cpu(req->mtu); | |
5368 | mps = __le16_to_cpu(req->mps); | |
5369 | psm = req->psm; | |
5370 | dcid = 0; | |
0cd75f7e | 5371 | credits = 0; |
27e2d4c8 JH |
5372 | |
5373 | if (mtu < 23 || mps < 23) | |
5374 | return -EPROTO; | |
5375 | ||
5376 | BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), | |
5377 | scid, mtu, mps); | |
5378 | ||
5379 | /* Check if we have socket listening on psm */ | |
5380 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, | |
5381 | &conn->hcon->dst, LE_LINK); | |
5382 | if (!pchan) { | |
5383 | result = L2CAP_CR_BAD_PSM; | |
5384 | chan = NULL; | |
5385 | goto response; | |
5386 | } | |
5387 | ||
5388 | mutex_lock(&conn->chan_lock); | |
5389 | l2cap_chan_lock(pchan); | |
5390 | ||
5391 | if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) { | |
5392 | result = L2CAP_CR_AUTHENTICATION; | |
5393 | chan = NULL; | |
5394 | goto response_unlock; | |
5395 | } | |
5396 | ||
5397 | /* Check if we already have channel with that dcid */ | |
5398 | if (__l2cap_get_chan_by_dcid(conn, scid)) { | |
5399 | result = L2CAP_CR_NO_MEM; | |
5400 | chan = NULL; | |
5401 | goto response_unlock; | |
5402 | } | |
5403 | ||
5404 | chan = pchan->ops->new_connection(pchan); | |
5405 | if (!chan) { | |
5406 | result = L2CAP_CR_NO_MEM; | |
5407 | goto response_unlock; | |
5408 | } | |
5409 | ||
0ce43ce6 JH |
5410 | l2cap_le_flowctl_init(chan); |
5411 | ||
27e2d4c8 JH |
5412 | bacpy(&chan->src, &conn->hcon->src); |
5413 | bacpy(&chan->dst, &conn->hcon->dst); | |
5414 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); | |
5415 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
5416 | chan->psm = psm; | |
5417 | chan->dcid = scid; | |
5418 | chan->omtu = mtu; | |
5419 | chan->remote_mps = mps; | |
0cd75f7e | 5420 | chan->tx_credits = __le16_to_cpu(req->credits); |
27e2d4c8 JH |
5421 | |
5422 | __l2cap_chan_add(conn, chan); | |
5423 | dcid = chan->scid; | |
0cd75f7e | 5424 | credits = chan->rx_credits; |
27e2d4c8 JH |
5425 | |
5426 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
5427 | ||
5428 | chan->ident = cmd->ident; | |
5429 | ||
5430 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { | |
5431 | l2cap_state_change(chan, BT_CONNECT2); | |
434714dc JH |
5432 | /* The following result value is actually not defined |
5433 | * for LE CoC but we use it to let the function know | |
5434 | * that it should bail out after doing its cleanup | |
5435 | * instead of sending a response. | |
5436 | */ | |
27e2d4c8 JH |
5437 | result = L2CAP_CR_PEND; |
5438 | chan->ops->defer(chan); | |
5439 | } else { | |
5440 | l2cap_chan_ready(chan); | |
5441 | result = L2CAP_CR_SUCCESS; | |
5442 | } | |
5443 | ||
5444 | response_unlock: | |
5445 | l2cap_chan_unlock(pchan); | |
5446 | mutex_unlock(&conn->chan_lock); | |
a24cce14 | 5447 | l2cap_chan_put(pchan); |
27e2d4c8 JH |
5448 | |
5449 | if (result == L2CAP_CR_PEND) | |
5450 | return 0; | |
5451 | ||
5452 | response: | |
5453 | if (chan) { | |
5454 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 5455 | rsp.mps = cpu_to_le16(chan->mps); |
27e2d4c8 JH |
5456 | } else { |
5457 | rsp.mtu = 0; | |
5458 | rsp.mps = 0; | |
5459 | } | |
5460 | ||
5461 | rsp.dcid = cpu_to_le16(dcid); | |
0cd75f7e | 5462 | rsp.credits = cpu_to_le16(credits); |
27e2d4c8 JH |
5463 | rsp.result = cpu_to_le16(result); |
5464 | ||
5465 | l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); | |
5466 | ||
5467 | return 0; | |
5468 | } | |
5469 | ||
fad5fc89 JH |
5470 | static inline int l2cap_le_credits(struct l2cap_conn *conn, |
5471 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5472 | u8 *data) | |
5473 | { | |
5474 | struct l2cap_le_credits *pkt; | |
5475 | struct l2cap_chan *chan; | |
0f1bfe4e | 5476 | u16 cid, credits, max_credits; |
fad5fc89 JH |
5477 | |
5478 | if (cmd_len != sizeof(*pkt)) | |
5479 | return -EPROTO; | |
5480 | ||
5481 | pkt = (struct l2cap_le_credits *) data; | |
5482 | cid = __le16_to_cpu(pkt->cid); | |
5483 | credits = __le16_to_cpu(pkt->credits); | |
5484 | ||
5485 | BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); | |
5486 | ||
5487 | chan = l2cap_get_chan_by_dcid(conn, cid); | |
5488 | if (!chan) | |
5489 | return -EBADSLT; | |
5490 | ||
0f1bfe4e JH |
5491 | max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; |
5492 | if (credits > max_credits) { | |
5493 | BT_ERR("LE credits overflow"); | |
5494 | l2cap_send_disconn_req(chan, ECONNRESET); | |
ee93053d | 5495 | l2cap_chan_unlock(chan); |
0f1bfe4e JH |
5496 | |
5497 | /* Return 0 so that we don't trigger an unnecessary | |
5498 | * command reject packet. | |
5499 | */ | |
5500 | return 0; | |
5501 | } | |
5502 | ||
fad5fc89 JH |
5503 | chan->tx_credits += credits; |
5504 | ||
5505 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
5506 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
5507 | chan->tx_credits--; | |
5508 | } | |
5509 | ||
5510 | if (chan->tx_credits) | |
5511 | chan->ops->resume(chan); | |
5512 | ||
5513 | l2cap_chan_unlock(chan); | |
5514 | ||
5515 | return 0; | |
5516 | } | |
5517 | ||
71fb4197 JH |
5518 | static inline int l2cap_le_command_rej(struct l2cap_conn *conn, |
5519 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5520 | u8 *data) | |
5521 | { | |
5522 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; | |
5523 | struct l2cap_chan *chan; | |
5524 | ||
5525 | if (cmd_len < sizeof(*rej)) | |
5526 | return -EPROTO; | |
5527 | ||
5528 | mutex_lock(&conn->chan_lock); | |
5529 | ||
5530 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5531 | if (!chan) | |
5532 | goto done; | |
5533 | ||
5534 | l2cap_chan_lock(chan); | |
5535 | l2cap_chan_del(chan, ECONNREFUSED); | |
5536 | l2cap_chan_unlock(chan); | |
5537 | ||
5538 | done: | |
5539 | mutex_unlock(&conn->chan_lock); | |
5540 | return 0; | |
5541 | } | |
5542 | ||
3300d9a9 | 5543 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
203e639e JH |
5544 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5545 | u8 *data) | |
3300d9a9 | 5546 | { |
b5ecba64 JH |
5547 | int err = 0; |
5548 | ||
3300d9a9 CT |
5549 | switch (cmd->code) { |
5550 | case L2CAP_COMMAND_REJ: | |
71fb4197 | 5551 | l2cap_le_command_rej(conn, cmd, cmd_len, data); |
b5ecba64 | 5552 | break; |
3300d9a9 CT |
5553 | |
5554 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
b5ecba64 JH |
5555 | err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
5556 | break; | |
3300d9a9 CT |
5557 | |
5558 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
b5ecba64 | 5559 | break; |
3300d9a9 | 5560 | |
f1496dee JH |
5561 | case L2CAP_LE_CONN_RSP: |
5562 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5563 | break; |
f1496dee | 5564 | |
27e2d4c8 | 5565 | case L2CAP_LE_CONN_REQ: |
b5ecba64 JH |
5566 | err = l2cap_le_connect_req(conn, cmd, cmd_len, data); |
5567 | break; | |
27e2d4c8 | 5568 | |
fad5fc89 JH |
5569 | case L2CAP_LE_CREDITS: |
5570 | err = l2cap_le_credits(conn, cmd, cmd_len, data); | |
5571 | break; | |
5572 | ||
3defe01a | 5573 | case L2CAP_DISCONN_REQ: |
b5ecba64 JH |
5574 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
5575 | break; | |
3defe01a JH |
5576 | |
5577 | case L2CAP_DISCONN_RSP: | |
5578 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5579 | break; |
3defe01a | 5580 | |
3300d9a9 CT |
5581 | default: |
5582 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
b5ecba64 JH |
5583 | err = -EINVAL; |
5584 | break; | |
3300d9a9 | 5585 | } |
b5ecba64 JH |
5586 | |
5587 | return err; | |
3300d9a9 CT |
5588 | } |
5589 | ||
c5623556 JH |
5590 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5591 | struct sk_buff *skb) | |
5592 | { | |
69c4e4e8 | 5593 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5594 | struct l2cap_cmd_hdr *cmd; |
5595 | u16 len; | |
c5623556 JH |
5596 | int err; |
5597 | ||
69c4e4e8 | 5598 | if (hcon->type != LE_LINK) |
3b166295 | 5599 | goto drop; |
69c4e4e8 | 5600 | |
4f3e219d MH |
5601 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5602 | goto drop; | |
c5623556 | 5603 | |
4f3e219d MH |
5604 | cmd = (void *) skb->data; |
5605 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5606 | |
4f3e219d | 5607 | len = le16_to_cpu(cmd->len); |
c5623556 | 5608 | |
4f3e219d | 5609 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5610 | |
4f3e219d MH |
5611 | if (len != skb->len || !cmd->ident) { |
5612 | BT_DBG("corrupted command"); | |
5613 | goto drop; | |
5614 | } | |
c5623556 | 5615 | |
203e639e | 5616 | err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); |
4f3e219d MH |
5617 | if (err) { |
5618 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5619 | |
4f3e219d | 5620 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5621 | |
dcf4adbf | 5622 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5623 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5624 | sizeof(rej), &rej); | |
c5623556 JH |
5625 | } |
5626 | ||
3b166295 | 5627 | drop: |
c5623556 JH |
5628 | kfree_skb(skb); |
5629 | } | |
5630 | ||
3300d9a9 | 5631 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5632 | struct sk_buff *skb) |
1da177e4 | 5633 | { |
69c4e4e8 | 5634 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5635 | u8 *data = skb->data; |
5636 | int len = skb->len; | |
5637 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5638 | int err; |
1da177e4 LT |
5639 | |
5640 | l2cap_raw_recv(conn, skb); | |
5641 | ||
69c4e4e8 | 5642 | if (hcon->type != ACL_LINK) |
3b166295 | 5643 | goto drop; |
69c4e4e8 | 5644 | |
1da177e4 | 5645 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5646 | u16 cmd_len; |
1da177e4 LT |
5647 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5648 | data += L2CAP_CMD_HDR_SIZE; | |
5649 | len -= L2CAP_CMD_HDR_SIZE; | |
5650 | ||
88219a0f | 5651 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5652 | |
2d792818 GP |
5653 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5654 | cmd.ident); | |
1da177e4 | 5655 | |
88219a0f | 5656 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5657 | BT_DBG("corrupted command"); |
5658 | break; | |
5659 | } | |
5660 | ||
c5623556 | 5661 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5662 | if (err) { |
e2fd318e | 5663 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5664 | |
5665 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5666 | |
dcf4adbf | 5667 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5668 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5669 | sizeof(rej), &rej); | |
1da177e4 LT |
5670 | } |
5671 | ||
88219a0f AV |
5672 | data += cmd_len; |
5673 | len -= cmd_len; | |
1da177e4 LT |
5674 | } |
5675 | ||
3b166295 | 5676 | drop: |
1da177e4 LT |
5677 | kfree_skb(skb); |
5678 | } | |
5679 | ||
47d1ec61 | 5680 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5681 | { |
5682 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5683 | int hdr_size; |
5684 | ||
5685 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5686 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5687 | else | |
5688 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5689 | |
47d1ec61 | 5690 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5691 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5692 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5693 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5694 | ||
5695 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5696 | return -EBADMSG; |
fcc203c3 GP |
5697 | } |
5698 | return 0; | |
5699 | } | |
5700 | ||
6ea00485 | 5701 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5702 | { |
e31f7633 | 5703 | struct l2cap_ctrl control; |
d5392c8f | 5704 | |
e31f7633 | 5705 | BT_DBG("chan %p", chan); |
d5392c8f | 5706 | |
e31f7633 MM |
5707 | memset(&control, 0, sizeof(control)); |
5708 | control.sframe = 1; | |
5709 | control.final = 1; | |
5710 | control.reqseq = chan->buffer_seq; | |
5711 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5712 | |
e2ab4353 | 5713 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5714 | control.super = L2CAP_SUPER_RNR; |
5715 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5716 | } |
5717 | ||
e31f7633 MM |
5718 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5719 | chan->unacked_frames > 0) | |
5720 | __set_retrans_timer(chan); | |
d5392c8f | 5721 | |
e31f7633 | 5722 | /* Send pending iframes */ |
525cd185 | 5723 | l2cap_ertm_send(chan); |
d5392c8f | 5724 | |
e2ab4353 | 5725 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5726 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5727 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5728 | * send it now. | |
5729 | */ | |
5730 | control.super = L2CAP_SUPER_RR; | |
5731 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5732 | } |
5733 | } | |
5734 | ||
2d792818 GP |
5735 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5736 | struct sk_buff **last_frag) | |
18778a63 | 5737 | { |
84084a31 MM |
5738 | /* skb->len reflects data in skb as well as all fragments |
5739 | * skb->data_len reflects only data in fragments | |
5740 | */ | |
5741 | if (!skb_has_frag_list(skb)) | |
5742 | skb_shinfo(skb)->frag_list = new_frag; | |
5743 | ||
5744 | new_frag->next = NULL; | |
5745 | ||
5746 | (*last_frag)->next = new_frag; | |
5747 | *last_frag = new_frag; | |
5748 | ||
5749 | skb->len += new_frag->len; | |
5750 | skb->data_len += new_frag->len; | |
5751 | skb->truesize += new_frag->truesize; | |
5752 | } | |
5753 | ||
4b51dae9 MM |
5754 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5755 | struct l2cap_ctrl *control) | |
84084a31 MM |
5756 | { |
5757 | int err = -EINVAL; | |
18778a63 | 5758 | |
4b51dae9 | 5759 | switch (control->sar) { |
7e0ef6ee | 5760 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5761 | if (chan->sdu) |
5762 | break; | |
18778a63 | 5763 | |
80b98027 | 5764 | err = chan->ops->recv(chan, skb); |
84084a31 | 5765 | break; |
18778a63 | 5766 | |
7e0ef6ee | 5767 | case L2CAP_SAR_START: |
84084a31 MM |
5768 | if (chan->sdu) |
5769 | break; | |
18778a63 | 5770 | |
6f61fd47 | 5771 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5772 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5773 | |
84084a31 MM |
5774 | if (chan->sdu_len > chan->imtu) { |
5775 | err = -EMSGSIZE; | |
5776 | break; | |
5777 | } | |
1890d36b | 5778 | |
84084a31 MM |
5779 | if (skb->len >= chan->sdu_len) |
5780 | break; | |
18778a63 | 5781 | |
84084a31 MM |
5782 | chan->sdu = skb; |
5783 | chan->sdu_last_frag = skb; | |
18778a63 | 5784 | |
84084a31 MM |
5785 | skb = NULL; |
5786 | err = 0; | |
18778a63 GP |
5787 | break; |
5788 | ||
7e0ef6ee | 5789 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5790 | if (!chan->sdu) |
84084a31 | 5791 | break; |
18778a63 | 5792 | |
84084a31 MM |
5793 | append_skb_frag(chan->sdu, skb, |
5794 | &chan->sdu_last_frag); | |
5795 | skb = NULL; | |
18778a63 | 5796 | |
84084a31 MM |
5797 | if (chan->sdu->len >= chan->sdu_len) |
5798 | break; | |
4178ba46 | 5799 | |
84084a31 | 5800 | err = 0; |
18778a63 GP |
5801 | break; |
5802 | ||
7e0ef6ee | 5803 | case L2CAP_SAR_END: |
6f61fd47 | 5804 | if (!chan->sdu) |
84084a31 | 5805 | break; |
18778a63 | 5806 | |
84084a31 MM |
5807 | append_skb_frag(chan->sdu, skb, |
5808 | &chan->sdu_last_frag); | |
5809 | skb = NULL; | |
4178ba46 | 5810 | |
84084a31 MM |
5811 | if (chan->sdu->len != chan->sdu_len) |
5812 | break; | |
18778a63 | 5813 | |
80b98027 | 5814 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5815 | |
84084a31 MM |
5816 | if (!err) { |
5817 | /* Reassembly complete */ | |
5818 | chan->sdu = NULL; | |
5819 | chan->sdu_last_frag = NULL; | |
5820 | chan->sdu_len = 0; | |
1890d36b | 5821 | } |
18778a63 GP |
5822 | break; |
5823 | } | |
5824 | ||
84084a31 MM |
5825 | if (err) { |
5826 | kfree_skb(skb); | |
5827 | kfree_skb(chan->sdu); | |
5828 | chan->sdu = NULL; | |
5829 | chan->sdu_last_frag = NULL; | |
5830 | chan->sdu_len = 0; | |
5831 | } | |
18778a63 | 5832 | |
84084a31 | 5833 | return err; |
18778a63 GP |
5834 | } |
5835 | ||
32b32735 MM |
5836 | static int l2cap_resegment(struct l2cap_chan *chan) |
5837 | { | |
5838 | /* Placeholder */ | |
5839 | return 0; | |
5840 | } | |
5841 | ||
61aa4f5b | 5842 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5843 | { |
61aa4f5b | 5844 | u8 event; |
712132eb | 5845 | |
61aa4f5b MM |
5846 | if (chan->mode != L2CAP_MODE_ERTM) |
5847 | return; | |
712132eb | 5848 | |
61aa4f5b | 5849 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5850 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5851 | } |
5852 | ||
d2a7ac5d MM |
5853 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5854 | { | |
63838725 MM |
5855 | int err = 0; |
5856 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5857 | * until a gap is encountered. | |
5858 | */ | |
5859 | ||
5860 | BT_DBG("chan %p", chan); | |
5861 | ||
5862 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5863 | struct sk_buff *skb; | |
5864 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5865 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5866 | ||
5867 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5868 | ||
5869 | if (!skb) | |
5870 | break; | |
5871 | ||
5872 | skb_unlink(skb, &chan->srej_q); | |
5873 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5874 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5875 | if (err) | |
5876 | break; | |
5877 | } | |
5878 | ||
5879 | if (skb_queue_empty(&chan->srej_q)) { | |
5880 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5881 | l2cap_send_ack(chan); | |
5882 | } | |
5883 | ||
5884 | return err; | |
d2a7ac5d MM |
5885 | } |
5886 | ||
5887 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5888 | struct l2cap_ctrl *control) | |
5889 | { | |
f80842a8 MM |
5890 | struct sk_buff *skb; |
5891 | ||
5892 | BT_DBG("chan %p, control %p", chan, control); | |
5893 | ||
5894 | if (control->reqseq == chan->next_tx_seq) { | |
5895 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5896 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5897 | return; |
5898 | } | |
5899 | ||
5900 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5901 | ||
5902 | if (skb == NULL) { | |
5903 | BT_DBG("Seq %d not available for retransmission", | |
5904 | control->reqseq); | |
5905 | return; | |
5906 | } | |
5907 | ||
5908 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5909 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5910 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5911 | return; |
5912 | } | |
5913 | ||
5914 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5915 | ||
5916 | if (control->poll) { | |
5917 | l2cap_pass_to_tx(chan, control); | |
5918 | ||
5919 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5920 | l2cap_retransmit(chan, control); | |
5921 | l2cap_ertm_send(chan); | |
5922 | ||
5923 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5924 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5925 | chan->srej_save_reqseq = control->reqseq; | |
5926 | } | |
5927 | } else { | |
5928 | l2cap_pass_to_tx_fbit(chan, control); | |
5929 | ||
5930 | if (control->final) { | |
5931 | if (chan->srej_save_reqseq != control->reqseq || | |
5932 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5933 | &chan->conn_state)) | |
5934 | l2cap_retransmit(chan, control); | |
5935 | } else { | |
5936 | l2cap_retransmit(chan, control); | |
5937 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5938 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5939 | chan->srej_save_reqseq = control->reqseq; | |
5940 | } | |
5941 | } | |
5942 | } | |
d2a7ac5d MM |
5943 | } |
5944 | ||
5945 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5946 | struct l2cap_ctrl *control) | |
5947 | { | |
fcd289df MM |
5948 | struct sk_buff *skb; |
5949 | ||
5950 | BT_DBG("chan %p, control %p", chan, control); | |
5951 | ||
5952 | if (control->reqseq == chan->next_tx_seq) { | |
5953 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5954 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5955 | return; |
5956 | } | |
5957 | ||
5958 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5959 | ||
5960 | if (chan->max_tx && skb && | |
5961 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
5962 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5963 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5964 | return; |
5965 | } | |
5966 | ||
5967 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5968 | ||
5969 | l2cap_pass_to_tx(chan, control); | |
5970 | ||
5971 | if (control->final) { | |
5972 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
5973 | l2cap_retransmit_all(chan, control); | |
5974 | } else { | |
5975 | l2cap_retransmit_all(chan, control); | |
5976 | l2cap_ertm_send(chan); | |
5977 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
5978 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
5979 | } | |
d2a7ac5d MM |
5980 | } |
5981 | ||
4b51dae9 MM |
5982 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
5983 | { | |
5984 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
5985 | ||
5986 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
5987 | chan->expected_tx_seq); | |
5988 | ||
5989 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
5990 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 5991 | chan->tx_win) { |
4b51dae9 MM |
5992 | /* See notes below regarding "double poll" and |
5993 | * invalid packets. | |
5994 | */ | |
5995 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5996 | BT_DBG("Invalid/Ignore - after SREJ"); | |
5997 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5998 | } else { | |
5999 | BT_DBG("Invalid - in window after SREJ sent"); | |
6000 | return L2CAP_TXSEQ_INVALID; | |
6001 | } | |
6002 | } | |
6003 | ||
6004 | if (chan->srej_list.head == txseq) { | |
6005 | BT_DBG("Expected SREJ"); | |
6006 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
6007 | } | |
6008 | ||
6009 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
6010 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
6011 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
6012 | } | |
6013 | ||
6014 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
6015 | BT_DBG("Unexpected SREJ - not requested"); | |
6016 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
6017 | } | |
6018 | } | |
6019 | ||
6020 | if (chan->expected_tx_seq == txseq) { | |
6021 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
6022 | chan->tx_win) { | |
6023 | BT_DBG("Invalid - txseq outside tx window"); | |
6024 | return L2CAP_TXSEQ_INVALID; | |
6025 | } else { | |
6026 | BT_DBG("Expected"); | |
6027 | return L2CAP_TXSEQ_EXPECTED; | |
6028 | } | |
6029 | } | |
6030 | ||
6031 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 6032 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
6033 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
6034 | return L2CAP_TXSEQ_DUPLICATE; | |
6035 | } | |
6036 | ||
6037 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
6038 | /* A source of invalid packets is a "double poll" condition, | |
6039 | * where delays cause us to send multiple poll packets. If | |
6040 | * the remote stack receives and processes both polls, | |
6041 | * sequence numbers can wrap around in such a way that a | |
6042 | * resent frame has a sequence number that looks like new data | |
6043 | * with a sequence gap. This would trigger an erroneous SREJ | |
6044 | * request. | |
6045 | * | |
6046 | * Fortunately, this is impossible with a tx window that's | |
6047 | * less than half of the maximum sequence number, which allows | |
6048 | * invalid frames to be safely ignored. | |
6049 | * | |
6050 | * With tx window sizes greater than half of the tx window | |
6051 | * maximum, the frame is invalid and cannot be ignored. This | |
6052 | * causes a disconnect. | |
6053 | */ | |
6054 | ||
6055 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6056 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
6057 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6058 | } else { | |
6059 | BT_DBG("Invalid - txseq outside tx window"); | |
6060 | return L2CAP_TXSEQ_INVALID; | |
6061 | } | |
6062 | } else { | |
6063 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
6064 | return L2CAP_TXSEQ_UNEXPECTED; | |
6065 | } | |
6066 | } | |
6067 | ||
d2a7ac5d MM |
6068 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
6069 | struct l2cap_ctrl *control, | |
6070 | struct sk_buff *skb, u8 event) | |
6071 | { | |
6072 | int err = 0; | |
941247f9 | 6073 | bool skb_in_use = false; |
d2a7ac5d MM |
6074 | |
6075 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6076 | event); | |
6077 | ||
6078 | switch (event) { | |
6079 | case L2CAP_EV_RECV_IFRAME: | |
6080 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
6081 | case L2CAP_TXSEQ_EXPECTED: | |
6082 | l2cap_pass_to_tx(chan, control); | |
6083 | ||
6084 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6085 | BT_DBG("Busy, discarding expected seq %d", | |
6086 | control->txseq); | |
6087 | break; | |
6088 | } | |
6089 | ||
6090 | chan->expected_tx_seq = __next_seq(chan, | |
6091 | control->txseq); | |
6092 | ||
6093 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 6094 | skb_in_use = true; |
d2a7ac5d MM |
6095 | |
6096 | err = l2cap_reassemble_sdu(chan, skb, control); | |
6097 | if (err) | |
6098 | break; | |
6099 | ||
6100 | if (control->final) { | |
6101 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6102 | &chan->conn_state)) { | |
6103 | control->final = 0; | |
6104 | l2cap_retransmit_all(chan, control); | |
6105 | l2cap_ertm_send(chan); | |
6106 | } | |
6107 | } | |
6108 | ||
6109 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
6110 | l2cap_send_ack(chan); | |
6111 | break; | |
6112 | case L2CAP_TXSEQ_UNEXPECTED: | |
6113 | l2cap_pass_to_tx(chan, control); | |
6114 | ||
6115 | /* Can't issue SREJ frames in the local busy state. | |
6116 | * Drop this frame, it will be seen as missing | |
6117 | * when local busy is exited. | |
6118 | */ | |
6119 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6120 | BT_DBG("Busy, discarding unexpected seq %d", | |
6121 | control->txseq); | |
6122 | break; | |
6123 | } | |
6124 | ||
6125 | /* There was a gap in the sequence, so an SREJ | |
6126 | * must be sent for each missing frame. The | |
6127 | * current frame is stored for later use. | |
6128 | */ | |
6129 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6130 | skb_in_use = true; |
d2a7ac5d MM |
6131 | BT_DBG("Queued %p (queue len %d)", skb, |
6132 | skb_queue_len(&chan->srej_q)); | |
6133 | ||
6134 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
6135 | l2cap_seq_list_clear(&chan->srej_list); | |
6136 | l2cap_send_srej(chan, control->txseq); | |
6137 | ||
6138 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
6139 | break; | |
6140 | case L2CAP_TXSEQ_DUPLICATE: | |
6141 | l2cap_pass_to_tx(chan, control); | |
6142 | break; | |
6143 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6144 | break; | |
6145 | case L2CAP_TXSEQ_INVALID: | |
6146 | default: | |
5e4e3972 | 6147 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6148 | break; |
6149 | } | |
6150 | break; | |
6151 | case L2CAP_EV_RECV_RR: | |
6152 | l2cap_pass_to_tx(chan, control); | |
6153 | if (control->final) { | |
6154 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6155 | ||
e6a3ee6e MM |
6156 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
6157 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
6158 | control->final = 0; |
6159 | l2cap_retransmit_all(chan, control); | |
6160 | } | |
6161 | ||
6162 | l2cap_ertm_send(chan); | |
6163 | } else if (control->poll) { | |
6164 | l2cap_send_i_or_rr_or_rnr(chan); | |
6165 | } else { | |
6166 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6167 | &chan->conn_state) && | |
6168 | chan->unacked_frames) | |
6169 | __set_retrans_timer(chan); | |
6170 | ||
6171 | l2cap_ertm_send(chan); | |
6172 | } | |
6173 | break; | |
6174 | case L2CAP_EV_RECV_RNR: | |
6175 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6176 | l2cap_pass_to_tx(chan, control); | |
6177 | if (control && control->poll) { | |
6178 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6179 | l2cap_send_rr_or_rnr(chan, 0); | |
6180 | } | |
6181 | __clear_retrans_timer(chan); | |
6182 | l2cap_seq_list_clear(&chan->retrans_list); | |
6183 | break; | |
6184 | case L2CAP_EV_RECV_REJ: | |
6185 | l2cap_handle_rej(chan, control); | |
6186 | break; | |
6187 | case L2CAP_EV_RECV_SREJ: | |
6188 | l2cap_handle_srej(chan, control); | |
6189 | break; | |
6190 | default: | |
6191 | break; | |
6192 | } | |
6193 | ||
6194 | if (skb && !skb_in_use) { | |
6195 | BT_DBG("Freeing %p", skb); | |
6196 | kfree_skb(skb); | |
6197 | } | |
6198 | ||
6199 | return err; | |
6200 | } | |
6201 | ||
6202 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
6203 | struct l2cap_ctrl *control, | |
6204 | struct sk_buff *skb, u8 event) | |
6205 | { | |
6206 | int err = 0; | |
6207 | u16 txseq = control->txseq; | |
941247f9 | 6208 | bool skb_in_use = false; |
d2a7ac5d MM |
6209 | |
6210 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6211 | event); | |
6212 | ||
6213 | switch (event) { | |
6214 | case L2CAP_EV_RECV_IFRAME: | |
6215 | switch (l2cap_classify_txseq(chan, txseq)) { | |
6216 | case L2CAP_TXSEQ_EXPECTED: | |
6217 | /* Keep frame for reassembly later */ | |
6218 | l2cap_pass_to_tx(chan, control); | |
6219 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6220 | skb_in_use = true; |
d2a7ac5d MM |
6221 | BT_DBG("Queued %p (queue len %d)", skb, |
6222 | skb_queue_len(&chan->srej_q)); | |
6223 | ||
6224 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
6225 | break; | |
6226 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
6227 | l2cap_seq_list_pop(&chan->srej_list); | |
6228 | ||
6229 | l2cap_pass_to_tx(chan, control); | |
6230 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6231 | skb_in_use = true; |
d2a7ac5d MM |
6232 | BT_DBG("Queued %p (queue len %d)", skb, |
6233 | skb_queue_len(&chan->srej_q)); | |
6234 | ||
6235 | err = l2cap_rx_queued_iframes(chan); | |
6236 | if (err) | |
6237 | break; | |
6238 | ||
6239 | break; | |
6240 | case L2CAP_TXSEQ_UNEXPECTED: | |
6241 | /* Got a frame that can't be reassembled yet. | |
6242 | * Save it for later, and send SREJs to cover | |
6243 | * the missing frames. | |
6244 | */ | |
6245 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6246 | skb_in_use = true; |
d2a7ac5d MM |
6247 | BT_DBG("Queued %p (queue len %d)", skb, |
6248 | skb_queue_len(&chan->srej_q)); | |
6249 | ||
6250 | l2cap_pass_to_tx(chan, control); | |
6251 | l2cap_send_srej(chan, control->txseq); | |
6252 | break; | |
6253 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
6254 | /* This frame was requested with an SREJ, but | |
6255 | * some expected retransmitted frames are | |
6256 | * missing. Request retransmission of missing | |
6257 | * SREJ'd frames. | |
6258 | */ | |
6259 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6260 | skb_in_use = true; |
d2a7ac5d MM |
6261 | BT_DBG("Queued %p (queue len %d)", skb, |
6262 | skb_queue_len(&chan->srej_q)); | |
6263 | ||
6264 | l2cap_pass_to_tx(chan, control); | |
6265 | l2cap_send_srej_list(chan, control->txseq); | |
6266 | break; | |
6267 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
6268 | /* We've already queued this frame. Drop this copy. */ | |
6269 | l2cap_pass_to_tx(chan, control); | |
6270 | break; | |
6271 | case L2CAP_TXSEQ_DUPLICATE: | |
6272 | /* Expecting a later sequence number, so this frame | |
6273 | * was already received. Ignore it completely. | |
6274 | */ | |
6275 | break; | |
6276 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6277 | break; | |
6278 | case L2CAP_TXSEQ_INVALID: | |
6279 | default: | |
5e4e3972 | 6280 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6281 | break; |
6282 | } | |
6283 | break; | |
6284 | case L2CAP_EV_RECV_RR: | |
6285 | l2cap_pass_to_tx(chan, control); | |
6286 | if (control->final) { | |
6287 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6288 | ||
6289 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6290 | &chan->conn_state)) { | |
6291 | control->final = 0; | |
6292 | l2cap_retransmit_all(chan, control); | |
6293 | } | |
6294 | ||
6295 | l2cap_ertm_send(chan); | |
6296 | } else if (control->poll) { | |
6297 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6298 | &chan->conn_state) && | |
6299 | chan->unacked_frames) { | |
6300 | __set_retrans_timer(chan); | |
6301 | } | |
6302 | ||
6303 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6304 | l2cap_send_srej_tail(chan); | |
6305 | } else { | |
6306 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6307 | &chan->conn_state) && | |
6308 | chan->unacked_frames) | |
6309 | __set_retrans_timer(chan); | |
6310 | ||
6311 | l2cap_send_ack(chan); | |
6312 | } | |
6313 | break; | |
6314 | case L2CAP_EV_RECV_RNR: | |
6315 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6316 | l2cap_pass_to_tx(chan, control); | |
6317 | if (control->poll) { | |
6318 | l2cap_send_srej_tail(chan); | |
6319 | } else { | |
6320 | struct l2cap_ctrl rr_control; | |
6321 | memset(&rr_control, 0, sizeof(rr_control)); | |
6322 | rr_control.sframe = 1; | |
6323 | rr_control.super = L2CAP_SUPER_RR; | |
6324 | rr_control.reqseq = chan->buffer_seq; | |
6325 | l2cap_send_sframe(chan, &rr_control); | |
6326 | } | |
6327 | ||
6328 | break; | |
6329 | case L2CAP_EV_RECV_REJ: | |
6330 | l2cap_handle_rej(chan, control); | |
6331 | break; | |
6332 | case L2CAP_EV_RECV_SREJ: | |
6333 | l2cap_handle_srej(chan, control); | |
6334 | break; | |
6335 | } | |
6336 | ||
6337 | if (skb && !skb_in_use) { | |
6338 | BT_DBG("Freeing %p", skb); | |
6339 | kfree_skb(skb); | |
6340 | } | |
6341 | ||
6342 | return err; | |
6343 | } | |
6344 | ||
32b32735 MM |
6345 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6346 | { | |
6347 | BT_DBG("chan %p", chan); | |
6348 | ||
6349 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6350 | ||
6351 | if (chan->hs_hcon) | |
6352 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6353 | else | |
6354 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6355 | ||
6356 | return l2cap_resegment(chan); | |
6357 | } | |
6358 | ||
6359 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6360 | struct l2cap_ctrl *control, | |
6361 | struct sk_buff *skb, u8 event) | |
6362 | { | |
6363 | int err; | |
6364 | ||
6365 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6366 | event); | |
6367 | ||
6368 | if (!control->poll) | |
6369 | return -EPROTO; | |
6370 | ||
6371 | l2cap_process_reqseq(chan, control->reqseq); | |
6372 | ||
6373 | if (!skb_queue_empty(&chan->tx_q)) | |
6374 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6375 | else | |
6376 | chan->tx_send_head = NULL; | |
6377 | ||
6378 | /* Rewind next_tx_seq to the point expected | |
6379 | * by the receiver. | |
6380 | */ | |
6381 | chan->next_tx_seq = control->reqseq; | |
6382 | chan->unacked_frames = 0; | |
6383 | ||
6384 | err = l2cap_finish_move(chan); | |
6385 | if (err) | |
6386 | return err; | |
6387 | ||
6388 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6389 | l2cap_send_i_or_rr_or_rnr(chan); | |
6390 | ||
6391 | if (event == L2CAP_EV_RECV_IFRAME) | |
6392 | return -EPROTO; | |
6393 | ||
6394 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6395 | } | |
6396 | ||
6397 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6398 | struct l2cap_ctrl *control, | |
6399 | struct sk_buff *skb, u8 event) | |
6400 | { | |
6401 | int err; | |
6402 | ||
6403 | if (!control->final) | |
6404 | return -EPROTO; | |
6405 | ||
6406 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6407 | ||
6408 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6409 | l2cap_process_reqseq(chan, control->reqseq); | |
6410 | ||
6411 | if (!skb_queue_empty(&chan->tx_q)) | |
6412 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6413 | else | |
6414 | chan->tx_send_head = NULL; | |
6415 | ||
6416 | /* Rewind next_tx_seq to the point expected | |
6417 | * by the receiver. | |
6418 | */ | |
6419 | chan->next_tx_seq = control->reqseq; | |
6420 | chan->unacked_frames = 0; | |
6421 | ||
6422 | if (chan->hs_hcon) | |
6423 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6424 | else | |
6425 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6426 | ||
6427 | err = l2cap_resegment(chan); | |
6428 | ||
6429 | if (!err) | |
6430 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6431 | ||
6432 | return err; | |
6433 | } | |
6434 | ||
d2a7ac5d MM |
6435 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6436 | { | |
6437 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6438 | u16 unacked; | |
6439 | ||
6440 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6441 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6442 | } | |
6443 | ||
cec8ab6e MM |
6444 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6445 | struct sk_buff *skb, u8 event) | |
218bb9df | 6446 | { |
d2a7ac5d MM |
6447 | int err = 0; |
6448 | ||
6449 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6450 | control, skb, event, chan->rx_state); | |
6451 | ||
6452 | if (__valid_reqseq(chan, control->reqseq)) { | |
6453 | switch (chan->rx_state) { | |
6454 | case L2CAP_RX_STATE_RECV: | |
6455 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6456 | break; | |
6457 | case L2CAP_RX_STATE_SREJ_SENT: | |
6458 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6459 | event); | |
6460 | break; | |
32b32735 MM |
6461 | case L2CAP_RX_STATE_WAIT_P: |
6462 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6463 | break; | |
6464 | case L2CAP_RX_STATE_WAIT_F: | |
6465 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6466 | break; | |
d2a7ac5d MM |
6467 | default: |
6468 | /* shut it down */ | |
6469 | break; | |
6470 | } | |
6471 | } else { | |
6472 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6473 | control->reqseq, chan->next_tx_seq, | |
6474 | chan->expected_ack_seq); | |
5e4e3972 | 6475 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6476 | } |
6477 | ||
6478 | return err; | |
cec8ab6e MM |
6479 | } |
6480 | ||
6481 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6482 | struct sk_buff *skb) | |
6483 | { | |
4b51dae9 MM |
6484 | int err = 0; |
6485 | ||
6486 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6487 | chan->rx_state); | |
6488 | ||
6489 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6490 | L2CAP_TXSEQ_EXPECTED) { | |
6491 | l2cap_pass_to_tx(chan, control); | |
6492 | ||
6493 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6494 | __next_seq(chan, chan->buffer_seq)); | |
6495 | ||
6496 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6497 | ||
6498 | l2cap_reassemble_sdu(chan, skb, control); | |
6499 | } else { | |
6500 | if (chan->sdu) { | |
6501 | kfree_skb(chan->sdu); | |
6502 | chan->sdu = NULL; | |
6503 | } | |
6504 | chan->sdu_last_frag = NULL; | |
6505 | chan->sdu_len = 0; | |
6506 | ||
6507 | if (skb) { | |
6508 | BT_DBG("Freeing %p", skb); | |
6509 | kfree_skb(skb); | |
6510 | } | |
6511 | } | |
6512 | ||
6513 | chan->last_acked_seq = control->txseq; | |
6514 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6515 | ||
6516 | return err; | |
cec8ab6e MM |
6517 | } |
6518 | ||
6519 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6520 | { | |
6521 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
6522 | u16 len; | |
6523 | u8 event; | |
218bb9df | 6524 | |
b76bbd66 MM |
6525 | __unpack_control(chan, skb); |
6526 | ||
218bb9df GP |
6527 | len = skb->len; |
6528 | ||
6529 | /* | |
6530 | * We can just drop the corrupted I-frame here. | |
6531 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6532 | * procedures and ask for retransmission. |
218bb9df | 6533 | */ |
47d1ec61 | 6534 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6535 | goto drop; |
6536 | ||
cec8ab6e | 6537 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6538 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6539 | |
47d1ec61 | 6540 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6541 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6542 | |
47d1ec61 | 6543 | if (len > chan->mps) { |
5e4e3972 | 6544 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6545 | goto drop; |
6546 | } | |
6547 | ||
cec8ab6e MM |
6548 | if (!control->sframe) { |
6549 | int err; | |
218bb9df | 6550 | |
cec8ab6e MM |
6551 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6552 | control->sar, control->reqseq, control->final, | |
6553 | control->txseq); | |
218bb9df | 6554 | |
cec8ab6e MM |
6555 | /* Validate F-bit - F=0 always valid, F=1 only |
6556 | * valid in TX WAIT_F | |
6557 | */ | |
6558 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6559 | goto drop; |
cec8ab6e MM |
6560 | |
6561 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6562 | event = L2CAP_EV_RECV_IFRAME; | |
6563 | err = l2cap_rx(chan, control, skb, event); | |
6564 | } else { | |
6565 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6566 | } |
6567 | ||
cec8ab6e | 6568 | if (err) |
5e4e3972 | 6569 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6570 | } else { |
cec8ab6e MM |
6571 | const u8 rx_func_to_event[4] = { |
6572 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6573 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6574 | }; | |
6575 | ||
6576 | /* Only I-frames are expected in streaming mode */ | |
6577 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6578 | goto drop; | |
6579 | ||
6580 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6581 | control->reqseq, control->final, control->poll, | |
6582 | control->super); | |
6583 | ||
218bb9df | 6584 | if (len != 0) { |
1bb166e6 | 6585 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6586 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6587 | goto drop; |
6588 | } | |
6589 | ||
cec8ab6e MM |
6590 | /* Validate F and P bits */ |
6591 | if (control->final && (control->poll || | |
6592 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6593 | goto drop; | |
6594 | ||
6595 | event = rx_func_to_event[control->super]; | |
6596 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6597 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6598 | } |
6599 | ||
6600 | return 0; | |
6601 | ||
6602 | drop: | |
6603 | kfree_skb(skb); | |
6604 | return 0; | |
6605 | } | |
6606 | ||
b1c325c2 JH |
6607 | static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) |
6608 | { | |
6609 | struct l2cap_conn *conn = chan->conn; | |
6610 | struct l2cap_le_credits pkt; | |
6611 | u16 return_credits; | |
6612 | ||
6613 | /* We return more credits to the sender only after the amount of | |
6614 | * credits falls below half of the initial amount. | |
6615 | */ | |
f15b8ecf | 6616 | if (chan->rx_credits >= (le_max_credits + 1) / 2) |
b1c325c2 JH |
6617 | return; |
6618 | ||
f15b8ecf | 6619 | return_credits = le_max_credits - chan->rx_credits; |
b1c325c2 JH |
6620 | |
6621 | BT_DBG("chan %p returning %u credits to sender", chan, return_credits); | |
6622 | ||
6623 | chan->rx_credits += return_credits; | |
6624 | ||
6625 | pkt.cid = cpu_to_le16(chan->scid); | |
6626 | pkt.credits = cpu_to_le16(return_credits); | |
6627 | ||
6628 | chan->ident = l2cap_get_ident(conn); | |
6629 | ||
6630 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); | |
6631 | } | |
6632 | ||
fad5fc89 JH |
6633 | static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
6634 | { | |
aac23bf6 JH |
6635 | int err; |
6636 | ||
6637 | if (!chan->rx_credits) { | |
6638 | BT_ERR("No credits to receive LE L2CAP data"); | |
dfd9774c | 6639 | l2cap_send_disconn_req(chan, ECONNRESET); |
fad5fc89 | 6640 | return -ENOBUFS; |
aac23bf6 | 6641 | } |
fad5fc89 | 6642 | |
aac23bf6 JH |
6643 | if (chan->imtu < skb->len) { |
6644 | BT_ERR("Too big LE L2CAP PDU"); | |
fad5fc89 | 6645 | return -ENOBUFS; |
aac23bf6 | 6646 | } |
fad5fc89 JH |
6647 | |
6648 | chan->rx_credits--; | |
6649 | BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); | |
6650 | ||
6651 | l2cap_chan_le_send_credits(chan); | |
6652 | ||
aac23bf6 JH |
6653 | err = 0; |
6654 | ||
6655 | if (!chan->sdu) { | |
6656 | u16 sdu_len; | |
6657 | ||
6658 | sdu_len = get_unaligned_le16(skb->data); | |
6659 | skb_pull(skb, L2CAP_SDULEN_SIZE); | |
6660 | ||
6661 | BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", | |
6662 | sdu_len, skb->len, chan->imtu); | |
6663 | ||
6664 | if (sdu_len > chan->imtu) { | |
6665 | BT_ERR("Too big LE L2CAP SDU length received"); | |
6666 | err = -EMSGSIZE; | |
6667 | goto failed; | |
6668 | } | |
6669 | ||
6670 | if (skb->len > sdu_len) { | |
6671 | BT_ERR("Too much LE L2CAP data received"); | |
6672 | err = -EINVAL; | |
6673 | goto failed; | |
6674 | } | |
6675 | ||
6676 | if (skb->len == sdu_len) | |
6677 | return chan->ops->recv(chan, skb); | |
6678 | ||
6679 | chan->sdu = skb; | |
6680 | chan->sdu_len = sdu_len; | |
6681 | chan->sdu_last_frag = skb; | |
6682 | ||
6683 | return 0; | |
6684 | } | |
6685 | ||
6686 | BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", | |
6687 | chan->sdu->len, skb->len, chan->sdu_len); | |
6688 | ||
6689 | if (chan->sdu->len + skb->len > chan->sdu_len) { | |
6690 | BT_ERR("Too much LE L2CAP data received"); | |
6691 | err = -EINVAL; | |
6692 | goto failed; | |
6693 | } | |
6694 | ||
6695 | append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); | |
6696 | skb = NULL; | |
6697 | ||
6698 | if (chan->sdu->len == chan->sdu_len) { | |
6699 | err = chan->ops->recv(chan, chan->sdu); | |
6700 | if (!err) { | |
6701 | chan->sdu = NULL; | |
6702 | chan->sdu_last_frag = NULL; | |
6703 | chan->sdu_len = 0; | |
6704 | } | |
6705 | } | |
6706 | ||
6707 | failed: | |
6708 | if (err) { | |
6709 | kfree_skb(skb); | |
6710 | kfree_skb(chan->sdu); | |
6711 | chan->sdu = NULL; | |
6712 | chan->sdu_last_frag = NULL; | |
6713 | chan->sdu_len = 0; | |
6714 | } | |
6715 | ||
6716 | /* We can't return an error here since we took care of the skb | |
6717 | * freeing internally. An error return would cause the caller to | |
6718 | * do a double-free of the skb. | |
6719 | */ | |
6720 | return 0; | |
fad5fc89 JH |
6721 | } |
6722 | ||
13ca56e0 AE |
6723 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6724 | struct sk_buff *skb) | |
1da177e4 | 6725 | { |
48454079 | 6726 | struct l2cap_chan *chan; |
1da177e4 | 6727 | |
baa7e1fa | 6728 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6729 | if (!chan) { |
97e8e89d AE |
6730 | if (cid == L2CAP_CID_A2MP) { |
6731 | chan = a2mp_channel_create(conn, skb); | |
6732 | if (!chan) { | |
6733 | kfree_skb(skb); | |
13ca56e0 | 6734 | return; |
97e8e89d AE |
6735 | } |
6736 | ||
6737 | l2cap_chan_lock(chan); | |
6738 | } else { | |
6739 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6740 | /* Drop packet and return */ | |
6741 | kfree_skb(skb); | |
13ca56e0 | 6742 | return; |
97e8e89d | 6743 | } |
1da177e4 LT |
6744 | } |
6745 | ||
49208c9c | 6746 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6747 | |
89bc500e | 6748 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6749 | goto drop; |
6750 | ||
0c1bc5c6 | 6751 | switch (chan->mode) { |
38319713 | 6752 | case L2CAP_MODE_LE_FLOWCTL: |
fad5fc89 JH |
6753 | if (l2cap_le_data_rcv(chan, skb) < 0) |
6754 | goto drop; | |
6755 | ||
6756 | goto done; | |
6757 | ||
1c2acffb GP |
6758 | case L2CAP_MODE_BASIC: |
6759 | /* If socket recv buffers overflows we drop data here | |
6760 | * which is *bad* because L2CAP has to be reliable. | |
6761 | * But we don't have any other choice. L2CAP doesn't | |
6762 | * provide flow control mechanism. */ | |
1da177e4 | 6763 | |
2c96e03d SJ |
6764 | if (chan->imtu < skb->len) { |
6765 | BT_ERR("Dropping L2CAP data: receive buffer overflow"); | |
1c2acffb | 6766 | goto drop; |
2c96e03d | 6767 | } |
1da177e4 | 6768 | |
80b98027 | 6769 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6770 | goto done; |
6771 | break; | |
6772 | ||
6773 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6774 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6775 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6776 | goto done; |
6777 | ||
1c2acffb | 6778 | default: |
0c1bc5c6 | 6779 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6780 | break; |
6781 | } | |
1da177e4 LT |
6782 | |
6783 | drop: | |
6784 | kfree_skb(skb); | |
6785 | ||
6786 | done: | |
6be36555 | 6787 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6788 | } |
6789 | ||
84104b24 AE |
6790 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6791 | struct sk_buff *skb) | |
1da177e4 | 6792 | { |
ae4fd2d3 | 6793 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6794 | struct l2cap_chan *chan; |
1da177e4 | 6795 | |
ae4fd2d3 | 6796 | if (hcon->type != ACL_LINK) |
a24cce14 | 6797 | goto free_skb; |
ae4fd2d3 | 6798 | |
bf20fd4e JH |
6799 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, |
6800 | ACL_LINK); | |
23691d75 | 6801 | if (!chan) |
a24cce14 | 6802 | goto free_skb; |
1da177e4 | 6803 | |
5b4cedaa | 6804 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6805 | |
89bc500e | 6806 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6807 | goto drop; |
6808 | ||
e13e21dc | 6809 | if (chan->imtu < skb->len) |
1da177e4 LT |
6810 | goto drop; |
6811 | ||
2edf870d | 6812 | /* Store remote BD_ADDR and PSM for msg_name */ |
06ae3314 | 6813 | bacpy(&bt_cb(skb)->bdaddr, &hcon->dst); |
2edf870d MH |
6814 | bt_cb(skb)->psm = psm; |
6815 | ||
a24cce14 JH |
6816 | if (!chan->ops->recv(chan, skb)) { |
6817 | l2cap_chan_put(chan); | |
84104b24 | 6818 | return; |
a24cce14 | 6819 | } |
1da177e4 LT |
6820 | |
6821 | drop: | |
a24cce14 JH |
6822 | l2cap_chan_put(chan); |
6823 | free_skb: | |
1da177e4 | 6824 | kfree_skb(skb); |
1da177e4 LT |
6825 | } |
6826 | ||
6827 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
6828 | { | |
6829 | struct l2cap_hdr *lh = (void *) skb->data; | |
61a939c6 | 6830 | struct hci_conn *hcon = conn->hcon; |
8e036fc3 AV |
6831 | u16 cid, len; |
6832 | __le16 psm; | |
1da177e4 | 6833 | |
61a939c6 JH |
6834 | if (hcon->state != BT_CONNECTED) { |
6835 | BT_DBG("queueing pending rx skb"); | |
6836 | skb_queue_tail(&conn->pending_rx, skb); | |
6837 | return; | |
6838 | } | |
6839 | ||
1da177e4 LT |
6840 | skb_pull(skb, L2CAP_HDR_SIZE); |
6841 | cid = __le16_to_cpu(lh->cid); | |
6842 | len = __le16_to_cpu(lh->len); | |
6843 | ||
1c2acffb GP |
6844 | if (len != skb->len) { |
6845 | kfree_skb(skb); | |
6846 | return; | |
6847 | } | |
6848 | ||
9e1d7e15 JH |
6849 | /* Since we can't actively block incoming LE connections we must |
6850 | * at least ensure that we ignore incoming data from them. | |
6851 | */ | |
6852 | if (hcon->type == LE_LINK && | |
dcc36c16 JH |
6853 | hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst, |
6854 | bdaddr_type(hcon, hcon->dst_type))) { | |
e493150e JH |
6855 | kfree_skb(skb); |
6856 | return; | |
6857 | } | |
6858 | ||
1da177e4 LT |
6859 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6860 | ||
6861 | switch (cid) { | |
8db4dc46 | 6862 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6863 | l2cap_sig_channel(conn, skb); |
6864 | break; | |
6865 | ||
8db4dc46 | 6866 | case L2CAP_CID_CONN_LESS: |
097db76c | 6867 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6868 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6869 | l2cap_conless_channel(conn, psm, skb); |
6870 | break; | |
6871 | ||
a2877629 MH |
6872 | case L2CAP_CID_LE_SIGNALING: |
6873 | l2cap_le_sig_channel(conn, skb); | |
6874 | break; | |
6875 | ||
1da177e4 LT |
6876 | default: |
6877 | l2cap_data_channel(conn, cid, skb); | |
6878 | break; | |
6879 | } | |
6880 | } | |
6881 | ||
61a939c6 JH |
6882 | static void process_pending_rx(struct work_struct *work) |
6883 | { | |
6884 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, | |
6885 | pending_rx_work); | |
6886 | struct sk_buff *skb; | |
6887 | ||
6888 | BT_DBG(""); | |
6889 | ||
6890 | while ((skb = skb_dequeue(&conn->pending_rx))) | |
6891 | l2cap_recv_frame(conn, skb); | |
6892 | } | |
6893 | ||
162b49e7 JH |
6894 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
6895 | { | |
6896 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6897 | struct hci_chan *hchan; | |
6898 | ||
6899 | if (conn) | |
6900 | return conn; | |
6901 | ||
6902 | hchan = hci_chan_create(hcon); | |
6903 | if (!hchan) | |
6904 | return NULL; | |
6905 | ||
27f70f3e | 6906 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); |
162b49e7 JH |
6907 | if (!conn) { |
6908 | hci_chan_del(hchan); | |
6909 | return NULL; | |
6910 | } | |
6911 | ||
6912 | kref_init(&conn->ref); | |
6913 | hcon->l2cap_data = conn; | |
51bb8457 | 6914 | conn->hcon = hci_conn_get(hcon); |
162b49e7 JH |
6915 | conn->hchan = hchan; |
6916 | ||
6917 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); | |
6918 | ||
6919 | switch (hcon->type) { | |
6920 | case LE_LINK: | |
6921 | if (hcon->hdev->le_mtu) { | |
6922 | conn->mtu = hcon->hdev->le_mtu; | |
6923 | break; | |
6924 | } | |
6925 | /* fall through */ | |
6926 | default: | |
6927 | conn->mtu = hcon->hdev->acl_mtu; | |
6928 | break; | |
6929 | } | |
6930 | ||
6931 | conn->feat_mask = 0; | |
6932 | ||
6933 | if (hcon->type == ACL_LINK) | |
6934 | conn->hs_enabled = test_bit(HCI_HS_ENABLED, | |
6935 | &hcon->hdev->dev_flags); | |
6936 | ||
5a54e7c8 | 6937 | mutex_init(&conn->ident_lock); |
162b49e7 JH |
6938 | mutex_init(&conn->chan_lock); |
6939 | ||
6940 | INIT_LIST_HEAD(&conn->chan_l); | |
6941 | INIT_LIST_HEAD(&conn->users); | |
6942 | ||
276d8073 | 6943 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
162b49e7 | 6944 | |
61a939c6 JH |
6945 | skb_queue_head_init(&conn->pending_rx); |
6946 | INIT_WORK(&conn->pending_rx_work, process_pending_rx); | |
f3d82d0c | 6947 | INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr); |
61a939c6 | 6948 | |
162b49e7 JH |
6949 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
6950 | ||
6951 | return conn; | |
6952 | } | |
6953 | ||
6954 | static bool is_valid_psm(u16 psm, u8 dst_type) { | |
6955 | if (!psm) | |
6956 | return false; | |
6957 | ||
6958 | if (bdaddr_type_is_le(dst_type)) | |
6959 | return (psm <= 0x00ff); | |
6960 | ||
6961 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
6962 | return ((psm & 0x0101) == 0x0001); | |
6963 | } | |
6964 | ||
6965 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, | |
6966 | bdaddr_t *dst, u8 dst_type) | |
6967 | { | |
6968 | struct l2cap_conn *conn; | |
6969 | struct hci_conn *hcon; | |
6970 | struct hci_dev *hdev; | |
162b49e7 JH |
6971 | int err; |
6972 | ||
6973 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, | |
6974 | dst_type, __le16_to_cpu(psm)); | |
6975 | ||
6976 | hdev = hci_get_route(dst, &chan->src); | |
6977 | if (!hdev) | |
6978 | return -EHOSTUNREACH; | |
6979 | ||
6980 | hci_dev_lock(hdev); | |
6981 | ||
162b49e7 JH |
6982 | if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && |
6983 | chan->chan_type != L2CAP_CHAN_RAW) { | |
6984 | err = -EINVAL; | |
6985 | goto done; | |
6986 | } | |
6987 | ||
21626e62 JH |
6988 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { |
6989 | err = -EINVAL; | |
6990 | goto done; | |
6991 | } | |
6992 | ||
6993 | if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { | |
162b49e7 JH |
6994 | err = -EINVAL; |
6995 | goto done; | |
6996 | } | |
6997 | ||
6998 | switch (chan->mode) { | |
6999 | case L2CAP_MODE_BASIC: | |
7000 | break; | |
7001 | case L2CAP_MODE_LE_FLOWCTL: | |
7002 | l2cap_le_flowctl_init(chan); | |
7003 | break; | |
7004 | case L2CAP_MODE_ERTM: | |
7005 | case L2CAP_MODE_STREAMING: | |
7006 | if (!disable_ertm) | |
7007 | break; | |
7008 | /* fall through */ | |
7009 | default: | |
beb19e4c | 7010 | err = -EOPNOTSUPP; |
162b49e7 JH |
7011 | goto done; |
7012 | } | |
7013 | ||
7014 | switch (chan->state) { | |
7015 | case BT_CONNECT: | |
7016 | case BT_CONNECT2: | |
7017 | case BT_CONFIG: | |
7018 | /* Already connecting */ | |
7019 | err = 0; | |
7020 | goto done; | |
7021 | ||
7022 | case BT_CONNECTED: | |
7023 | /* Already connected */ | |
7024 | err = -EISCONN; | |
7025 | goto done; | |
7026 | ||
7027 | case BT_OPEN: | |
7028 | case BT_BOUND: | |
7029 | /* Can connect */ | |
7030 | break; | |
7031 | ||
7032 | default: | |
7033 | err = -EBADFD; | |
7034 | goto done; | |
7035 | } | |
7036 | ||
7037 | /* Set destination address and psm */ | |
7038 | bacpy(&chan->dst, dst); | |
7039 | chan->dst_type = dst_type; | |
7040 | ||
7041 | chan->psm = psm; | |
7042 | chan->dcid = cid; | |
7043 | ||
6f77d8c7 | 7044 | if (bdaddr_type_is_le(dst_type)) { |
e804d25d | 7045 | u8 role; |
cdd6275e | 7046 | |
6f77d8c7 AG |
7047 | /* Convert from L2CAP channel address type to HCI address type |
7048 | */ | |
7049 | if (dst_type == BDADDR_LE_PUBLIC) | |
7050 | dst_type = ADDR_LE_DEV_PUBLIC; | |
7051 | else | |
7052 | dst_type = ADDR_LE_DEV_RANDOM; | |
7053 | ||
e804d25d JH |
7054 | if (test_bit(HCI_ADVERTISING, &hdev->dev_flags)) |
7055 | role = HCI_ROLE_SLAVE; | |
7056 | else | |
7057 | role = HCI_ROLE_MASTER; | |
cdd6275e | 7058 | |
04a6c589 | 7059 | hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level, |
e804d25d | 7060 | HCI_LE_CONN_TIMEOUT, role); |
6f77d8c7 | 7061 | } else { |
d93375a8 | 7062 | u8 auth_type = l2cap_get_auth_type(chan); |
04a6c589 | 7063 | hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type); |
6f77d8c7 | 7064 | } |
162b49e7 JH |
7065 | |
7066 | if (IS_ERR(hcon)) { | |
7067 | err = PTR_ERR(hcon); | |
7068 | goto done; | |
7069 | } | |
7070 | ||
7071 | conn = l2cap_conn_add(hcon); | |
7072 | if (!conn) { | |
7073 | hci_conn_drop(hcon); | |
7074 | err = -ENOMEM; | |
7075 | goto done; | |
7076 | } | |
7077 | ||
02e246ae JH |
7078 | mutex_lock(&conn->chan_lock); |
7079 | l2cap_chan_lock(chan); | |
7080 | ||
162b49e7 JH |
7081 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { |
7082 | hci_conn_drop(hcon); | |
7083 | err = -EBUSY; | |
02e246ae | 7084 | goto chan_unlock; |
162b49e7 JH |
7085 | } |
7086 | ||
7087 | /* Update source addr of the socket */ | |
7088 | bacpy(&chan->src, &hcon->src); | |
7089 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
7090 | ||
02e246ae | 7091 | __l2cap_chan_add(conn, chan); |
162b49e7 JH |
7092 | |
7093 | /* l2cap_chan_add takes its own ref so we can drop this one */ | |
7094 | hci_conn_drop(hcon); | |
7095 | ||
7096 | l2cap_state_change(chan, BT_CONNECT); | |
7097 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
7098 | ||
61202e4d JH |
7099 | /* Release chan->sport so that it can be reused by other |
7100 | * sockets (as it's only used for listening sockets). | |
7101 | */ | |
7102 | write_lock(&chan_list_lock); | |
7103 | chan->sport = 0; | |
7104 | write_unlock(&chan_list_lock); | |
7105 | ||
162b49e7 JH |
7106 | if (hcon->state == BT_CONNECTED) { |
7107 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { | |
7108 | __clear_chan_timer(chan); | |
e7cafc45 | 7109 | if (l2cap_chan_check_security(chan, true)) |
162b49e7 JH |
7110 | l2cap_state_change(chan, BT_CONNECTED); |
7111 | } else | |
7112 | l2cap_do_start(chan); | |
7113 | } | |
7114 | ||
7115 | err = 0; | |
7116 | ||
02e246ae | 7117 | chan_unlock: |
162b49e7 | 7118 | l2cap_chan_unlock(chan); |
02e246ae JH |
7119 | mutex_unlock(&conn->chan_lock); |
7120 | done: | |
162b49e7 JH |
7121 | hci_dev_unlock(hdev); |
7122 | hci_dev_put(hdev); | |
7123 | return err; | |
7124 | } | |
6b8d4a6a | 7125 | EXPORT_SYMBOL_GPL(l2cap_chan_connect); |
162b49e7 | 7126 | |
1da177e4 LT |
7127 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
7128 | ||
686ebf28 | 7129 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
7130 | { |
7131 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 7132 | struct l2cap_chan *c; |
1da177e4 | 7133 | |
6ed93dc6 | 7134 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
7135 | |
7136 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
7137 | read_lock(&chan_list_lock); |
7138 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 7139 | if (c->state != BT_LISTEN) |
1da177e4 LT |
7140 | continue; |
7141 | ||
7eafc59e | 7142 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 7143 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 7144 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 7145 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 7146 | exact++; |
7eafc59e | 7147 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 7148 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 7149 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
7150 | lm2 |= HCI_LM_MASTER; |
7151 | } | |
1da177e4 | 7152 | } |
23691d75 | 7153 | read_unlock(&chan_list_lock); |
1da177e4 LT |
7154 | |
7155 | return exact ? lm1 : lm2; | |
7156 | } | |
7157 | ||
e760ec12 JH |
7158 | /* Find the next fixed channel in BT_LISTEN state, continue iteration |
7159 | * from an existing channel in the list or from the beginning of the | |
7160 | * global list (by passing NULL as first parameter). | |
7161 | */ | |
7162 | static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c, | |
54a1b626 | 7163 | bdaddr_t *src, u8 link_type) |
e760ec12 JH |
7164 | { |
7165 | read_lock(&chan_list_lock); | |
7166 | ||
7167 | if (c) | |
7168 | c = list_next_entry(c, global_l); | |
7169 | else | |
7170 | c = list_entry(chan_list.next, typeof(*c), global_l); | |
7171 | ||
7172 | list_for_each_entry_from(c, &chan_list, global_l) { | |
7173 | if (c->chan_type != L2CAP_CHAN_FIXED) | |
7174 | continue; | |
7175 | if (c->state != BT_LISTEN) | |
7176 | continue; | |
7177 | if (bacmp(&c->src, src) && bacmp(&c->src, BDADDR_ANY)) | |
7178 | continue; | |
54a1b626 JH |
7179 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
7180 | continue; | |
7181 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
7182 | continue; | |
e760ec12 JH |
7183 | |
7184 | l2cap_chan_hold(c); | |
7185 | read_unlock(&chan_list_lock); | |
7186 | return c; | |
7187 | } | |
7188 | ||
7189 | read_unlock(&chan_list_lock); | |
7190 | ||
7191 | return NULL; | |
7192 | } | |
7193 | ||
9e664631 | 7194 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 7195 | { |
e760ec12 | 7196 | struct hci_dev *hdev = hcon->hdev; |
0139418c | 7197 | struct l2cap_conn *conn; |
e760ec12 JH |
7198 | struct l2cap_chan *pchan; |
7199 | u8 dst_type; | |
0139418c | 7200 | |
6ed93dc6 | 7201 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 7202 | |
dc0f5088 | 7203 | if (status) { |
e175072f | 7204 | l2cap_conn_del(hcon, bt_to_errno(status)); |
dc0f5088 | 7205 | return; |
ba6fc317 | 7206 | } |
dc0f5088 JH |
7207 | |
7208 | conn = l2cap_conn_add(hcon); | |
7209 | if (!conn) | |
7210 | return; | |
7211 | ||
e760ec12 JH |
7212 | dst_type = bdaddr_type(hcon, hcon->dst_type); |
7213 | ||
7214 | /* If device is blocked, do not create channels for it */ | |
7215 | if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type)) | |
7216 | return; | |
7217 | ||
7218 | /* Find fixed channels and notify them of the new connection. We | |
7219 | * use multiple individual lookups, continuing each time where | |
7220 | * we left off, because the list lock would prevent calling the | |
7221 | * potentially sleeping l2cap_chan_lock() function. | |
7222 | */ | |
54a1b626 | 7223 | pchan = l2cap_global_fixed_chan(NULL, &hdev->bdaddr, hcon->type); |
e760ec12 JH |
7224 | while (pchan) { |
7225 | struct l2cap_chan *chan, *next; | |
7226 | ||
7227 | /* Client fixed channels should override server ones */ | |
7228 | if (__l2cap_get_chan_by_dcid(conn, pchan->scid)) | |
7229 | goto next; | |
7230 | ||
7231 | l2cap_chan_lock(pchan); | |
7232 | chan = pchan->ops->new_connection(pchan); | |
7233 | if (chan) { | |
7234 | bacpy(&chan->src, &hcon->src); | |
7235 | bacpy(&chan->dst, &hcon->dst); | |
7236 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
7237 | chan->dst_type = dst_type; | |
7238 | ||
7239 | __l2cap_chan_add(conn, chan); | |
7240 | } | |
7241 | ||
7242 | l2cap_chan_unlock(pchan); | |
7243 | next: | |
54a1b626 JH |
7244 | next = l2cap_global_fixed_chan(pchan, &hdev->bdaddr, |
7245 | hcon->type); | |
e760ec12 JH |
7246 | l2cap_chan_put(pchan); |
7247 | pchan = next; | |
7248 | } | |
7249 | ||
dc0f5088 | 7250 | l2cap_conn_ready(conn); |
1da177e4 LT |
7251 | } |
7252 | ||
686ebf28 | 7253 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
7254 | { |
7255 | struct l2cap_conn *conn = hcon->l2cap_data; | |
7256 | ||
7257 | BT_DBG("hcon %p", hcon); | |
7258 | ||
686ebf28 | 7259 | if (!conn) |
9f5a0d7b | 7260 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
7261 | return conn->disc_reason; |
7262 | } | |
7263 | ||
9e664631 | 7264 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
7265 | { |
7266 | BT_DBG("hcon %p reason %d", hcon, reason); | |
7267 | ||
e175072f | 7268 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
7269 | } |
7270 | ||
4343478f | 7271 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 7272 | { |
715ec005 | 7273 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
7274 | return; |
7275 | ||
f62e4323 | 7276 | if (encrypt == 0x00) { |
4343478f | 7277 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 7278 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
7d513e92 MH |
7279 | } else if (chan->sec_level == BT_SECURITY_HIGH || |
7280 | chan->sec_level == BT_SECURITY_FIPS) | |
0f852724 | 7281 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 7282 | } else { |
4343478f | 7283 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 7284 | __clear_chan_timer(chan); |
f62e4323 MH |
7285 | } |
7286 | } | |
7287 | ||
686ebf28 | 7288 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 7289 | { |
0139418c | 7290 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 7291 | struct l2cap_chan *chan; |
1da177e4 | 7292 | |
0139418c | 7293 | if (!conn) |
1da177e4 | 7294 | return 0; |
0139418c | 7295 | |
89d8b407 | 7296 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 7297 | |
3df91ea2 | 7298 | mutex_lock(&conn->chan_lock); |
1da177e4 | 7299 | |
3df91ea2 | 7300 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 7301 | l2cap_chan_lock(chan); |
1da177e4 | 7302 | |
89d8b407 AE |
7303 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
7304 | state_to_string(chan->state)); | |
f1cb9af5 | 7305 | |
2338a7e0 | 7306 | if (chan->scid == L2CAP_CID_A2MP) { |
78eb2f98 AE |
7307 | l2cap_chan_unlock(chan); |
7308 | continue; | |
7309 | } | |
7310 | ||
191eb398 JH |
7311 | if (!status && encrypt) |
7312 | chan->sec_level = hcon->sec_level; | |
f1cb9af5 | 7313 | |
96eff46e | 7314 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 7315 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
7316 | continue; |
7317 | } | |
7318 | ||
89bc500e | 7319 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 7320 | chan->state == BT_CONFIG)) { |
d97c899b | 7321 | chan->ops->resume(chan); |
4343478f | 7322 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 7323 | l2cap_chan_unlock(chan); |
9719f8af MH |
7324 | continue; |
7325 | } | |
7326 | ||
89bc500e | 7327 | if (chan->state == BT_CONNECT) { |
6d3c15da | 7328 | if (!status) |
93c3e8f5 | 7329 | l2cap_start_connection(chan); |
6d3c15da | 7330 | else |
ba13ccd9 | 7331 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
89bc500e | 7332 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 7333 | struct l2cap_conn_rsp rsp; |
df3c3931 | 7334 | __u16 res, stat; |
1da177e4 | 7335 | |
b1235d79 | 7336 | if (!status) { |
bdc25783 | 7337 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
7338 | res = L2CAP_CR_PEND; |
7339 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 7340 | chan->ops->defer(chan); |
df3c3931 | 7341 | } else { |
acdcabf5 | 7342 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
7343 | res = L2CAP_CR_SUCCESS; |
7344 | stat = L2CAP_CS_NO_INFO; | |
7345 | } | |
b1235d79 | 7346 | } else { |
acdcabf5 | 7347 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 7348 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
7349 | res = L2CAP_CR_SEC_BLOCK; |
7350 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
7351 | } |
7352 | ||
fe4128e0 GP |
7353 | rsp.scid = cpu_to_le16(chan->dcid); |
7354 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
7355 | rsp.result = cpu_to_le16(res); |
7356 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 7357 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 7358 | sizeof(rsp), &rsp); |
2d369359 MM |
7359 | |
7360 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
7361 | res == L2CAP_CR_SUCCESS) { | |
7362 | char buf[128]; | |
7363 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
7364 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
7365 | L2CAP_CONF_REQ, | |
7366 | l2cap_build_conf_req(chan, buf), | |
7367 | buf); | |
7368 | chan->num_conf_req++; | |
7369 | } | |
b1235d79 | 7370 | } |
1da177e4 | 7371 | |
6be36555 | 7372 | l2cap_chan_unlock(chan); |
1da177e4 LT |
7373 | } |
7374 | ||
3df91ea2 | 7375 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 7376 | |
1da177e4 LT |
7377 | return 0; |
7378 | } | |
7379 | ||
686ebf28 | 7380 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
7381 | { |
7382 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
7383 | struct l2cap_hdr *hdr; |
7384 | int len; | |
1da177e4 | 7385 | |
1d13a254 AE |
7386 | /* For AMP controller do not create l2cap conn */ |
7387 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
7388 | goto drop; | |
1da177e4 | 7389 | |
5a08ecce | 7390 | if (!conn) |
baf43251 | 7391 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
7392 | |
7393 | if (!conn) | |
1da177e4 LT |
7394 | goto drop; |
7395 | ||
7396 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
7397 | ||
d73a0988 AE |
7398 | switch (flags) { |
7399 | case ACL_START: | |
7400 | case ACL_START_NO_FLUSH: | |
7401 | case ACL_COMPLETE: | |
1da177e4 LT |
7402 | if (conn->rx_len) { |
7403 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
7404 | kfree_skb(conn->rx_skb); | |
7405 | conn->rx_skb = NULL; | |
7406 | conn->rx_len = 0; | |
7407 | l2cap_conn_unreliable(conn, ECOMM); | |
7408 | } | |
7409 | ||
aae7fe22 AE |
7410 | /* Start fragment always begin with Basic L2CAP header */ |
7411 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
7412 | BT_ERR("Frame is too short (len %d)", skb->len); |
7413 | l2cap_conn_unreliable(conn, ECOMM); | |
7414 | goto drop; | |
7415 | } | |
7416 | ||
7417 | hdr = (struct l2cap_hdr *) skb->data; | |
7418 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
7419 | ||
7420 | if (len == skb->len) { | |
7421 | /* Complete frame received */ | |
7422 | l2cap_recv_frame(conn, skb); | |
7423 | return 0; | |
7424 | } | |
7425 | ||
7426 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
7427 | ||
7428 | if (skb->len > len) { | |
7429 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 7430 | skb->len, len); |
1da177e4 LT |
7431 | l2cap_conn_unreliable(conn, ECOMM); |
7432 | goto drop; | |
7433 | } | |
7434 | ||
7435 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 7436 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 7437 | if (!conn->rx_skb) |
1da177e4 LT |
7438 | goto drop; |
7439 | ||
d626f62b | 7440 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7441 | skb->len); |
1da177e4 | 7442 | conn->rx_len = len - skb->len; |
d73a0988 AE |
7443 | break; |
7444 | ||
7445 | case ACL_CONT: | |
1da177e4 LT |
7446 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
7447 | ||
7448 | if (!conn->rx_len) { | |
7449 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
7450 | l2cap_conn_unreliable(conn, ECOMM); | |
7451 | goto drop; | |
7452 | } | |
7453 | ||
7454 | if (skb->len > conn->rx_len) { | |
7455 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 7456 | skb->len, conn->rx_len); |
1da177e4 LT |
7457 | kfree_skb(conn->rx_skb); |
7458 | conn->rx_skb = NULL; | |
7459 | conn->rx_len = 0; | |
7460 | l2cap_conn_unreliable(conn, ECOMM); | |
7461 | goto drop; | |
7462 | } | |
7463 | ||
d626f62b | 7464 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7465 | skb->len); |
1da177e4 LT |
7466 | conn->rx_len -= skb->len; |
7467 | ||
7468 | if (!conn->rx_len) { | |
c4e5bafa JH |
7469 | /* Complete frame received. l2cap_recv_frame |
7470 | * takes ownership of the skb so set the global | |
7471 | * rx_skb pointer to NULL first. | |
7472 | */ | |
7473 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 7474 | conn->rx_skb = NULL; |
c4e5bafa | 7475 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 7476 | } |
d73a0988 | 7477 | break; |
1da177e4 LT |
7478 | } |
7479 | ||
7480 | drop: | |
7481 | kfree_skb(skb); | |
7482 | return 0; | |
7483 | } | |
7484 | ||
aef7d97c | 7485 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 7486 | { |
23691d75 | 7487 | struct l2cap_chan *c; |
1da177e4 | 7488 | |
333055f2 | 7489 | read_lock(&chan_list_lock); |
1da177e4 | 7490 | |
23691d75 | 7491 | list_for_each_entry(c, &chan_list, global_l) { |
fcb73338 | 7492 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7eafc59e | 7493 | &c->src, &c->dst, |
fcb73338 AE |
7494 | c->state, __le16_to_cpu(c->psm), |
7495 | c->scid, c->dcid, c->imtu, c->omtu, | |
7496 | c->sec_level, c->mode); | |
61e1b4b7 | 7497 | } |
1da177e4 | 7498 | |
333055f2 | 7499 | read_unlock(&chan_list_lock); |
1da177e4 | 7500 | |
aef7d97c | 7501 | return 0; |
1da177e4 LT |
7502 | } |
7503 | ||
aef7d97c MH |
7504 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
7505 | { | |
7506 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
7507 | } | |
7508 | ||
7509 | static const struct file_operations l2cap_debugfs_fops = { | |
7510 | .open = l2cap_debugfs_open, | |
7511 | .read = seq_read, | |
7512 | .llseek = seq_lseek, | |
7513 | .release = single_release, | |
7514 | }; | |
7515 | ||
7516 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 7517 | |
64274518 | 7518 | int __init l2cap_init(void) |
1da177e4 LT |
7519 | { |
7520 | int err; | |
be9d1227 | 7521 | |
bb58f747 | 7522 | err = l2cap_init_sockets(); |
1da177e4 LT |
7523 | if (err < 0) |
7524 | return err; | |
7525 | ||
1120e4bf MH |
7526 | if (IS_ERR_OR_NULL(bt_debugfs)) |
7527 | return 0; | |
7528 | ||
7529 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
7530 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 7531 | |
40b9397a | 7532 | debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs, |
f15b8ecf | 7533 | &le_max_credits); |
40b9397a | 7534 | debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs, |
f15b8ecf JH |
7535 | &le_default_mps); |
7536 | ||
1da177e4 | 7537 | return 0; |
1da177e4 LT |
7538 | } |
7539 | ||
64274518 | 7540 | void l2cap_exit(void) |
1da177e4 | 7541 | { |
aef7d97c | 7542 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 7543 | l2cap_cleanup_sockets(); |
1da177e4 LT |
7544 | } |
7545 | ||
d1c4a17d GP |
7546 | module_param(disable_ertm, bool, 0644); |
7547 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |