Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
7ef9fbf0 | 39 | |
ac4b7236 | 40 | #include "smp.h" |
7024728e | 41 | #include "a2mp.h" |
7ef9fbf0 | 42 | #include "amp.h" |
1da177e4 | 43 | |
d1de6d46 | 44 | bool disable_ertm; |
f0709e03 | 45 | |
547d1032 | 46 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD; |
d40bffbc | 47 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, }; |
1da177e4 | 48 | |
b5ad8b7f JB |
49 | static LIST_HEAD(chan_list); |
50 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 51 | |
1da177e4 | 52 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 53 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 54 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 55 | void *data); |
710f9b0a | 56 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
5e4e3972 | 57 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); |
1da177e4 | 58 | |
d660366d | 59 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2d792818 | 60 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 61 | |
4f1654e0 MH |
62 | static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type) |
63 | { | |
64 | if (hcon->type == LE_LINK) { | |
65 | if (type == ADDR_LE_DEV_PUBLIC) | |
66 | return BDADDR_LE_PUBLIC; | |
67 | else | |
68 | return BDADDR_LE_RANDOM; | |
69 | } | |
70 | ||
71 | return BDADDR_BREDR; | |
72 | } | |
73 | ||
0139418c | 74 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 75 | |
2d792818 GP |
76 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
77 | u16 cid) | |
0139418c | 78 | { |
3df91ea2 | 79 | struct l2cap_chan *c; |
3d57dc68 | 80 | |
3df91ea2 AE |
81 | list_for_each_entry(c, &conn->chan_l, list) { |
82 | if (c->dcid == cid) | |
83 | return c; | |
0139418c | 84 | } |
3df91ea2 | 85 | return NULL; |
0139418c MH |
86 | } |
87 | ||
2d792818 GP |
88 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
89 | u16 cid) | |
0139418c | 90 | { |
3df91ea2 | 91 | struct l2cap_chan *c; |
3d57dc68 | 92 | |
3df91ea2 AE |
93 | list_for_each_entry(c, &conn->chan_l, list) { |
94 | if (c->scid == cid) | |
95 | return c; | |
0139418c | 96 | } |
3df91ea2 | 97 | return NULL; |
0139418c MH |
98 | } |
99 | ||
100 | /* Find channel with given SCID. | |
ef191ade | 101 | * Returns locked channel. */ |
2d792818 GP |
102 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
103 | u16 cid) | |
0139418c | 104 | { |
48454079 | 105 | struct l2cap_chan *c; |
baa7e1fa | 106 | |
3df91ea2 | 107 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 108 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
109 | if (c) |
110 | l2cap_chan_lock(c); | |
3df91ea2 AE |
111 | mutex_unlock(&conn->chan_lock); |
112 | ||
48454079 | 113 | return c; |
0139418c MH |
114 | } |
115 | ||
b1a130b7 MM |
116 | /* Find channel with given DCID. |
117 | * Returns locked channel. | |
118 | */ | |
119 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
120 | u16 cid) | |
121 | { | |
122 | struct l2cap_chan *c; | |
123 | ||
124 | mutex_lock(&conn->chan_lock); | |
125 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
126 | if (c) | |
127 | l2cap_chan_lock(c); | |
128 | mutex_unlock(&conn->chan_lock); | |
129 | ||
130 | return c; | |
131 | } | |
132 | ||
2d792818 GP |
133 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
134 | u8 ident) | |
0139418c | 135 | { |
3df91ea2 | 136 | struct l2cap_chan *c; |
3d57dc68 | 137 | |
3df91ea2 AE |
138 | list_for_each_entry(c, &conn->chan_l, list) { |
139 | if (c->ident == ident) | |
140 | return c; | |
0139418c | 141 | } |
3df91ea2 | 142 | return NULL; |
0139418c MH |
143 | } |
144 | ||
5b155ef9 MM |
145 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
146 | u8 ident) | |
147 | { | |
148 | struct l2cap_chan *c; | |
149 | ||
150 | mutex_lock(&conn->chan_lock); | |
151 | c = __l2cap_get_chan_by_ident(conn, ident); | |
152 | if (c) | |
153 | l2cap_chan_lock(c); | |
154 | mutex_unlock(&conn->chan_lock); | |
155 | ||
156 | return c; | |
157 | } | |
158 | ||
23691d75 | 159 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 160 | { |
23691d75 | 161 | struct l2cap_chan *c; |
9e4425ff | 162 | |
23691d75 | 163 | list_for_each_entry(c, &chan_list, global_l) { |
7eafc59e | 164 | if (c->sport == psm && !bacmp(&c->src, src)) |
250938cb | 165 | return c; |
9e4425ff | 166 | } |
250938cb | 167 | return NULL; |
9e4425ff GP |
168 | } |
169 | ||
170 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
171 | { | |
73b2ec18 GP |
172 | int err; |
173 | ||
333055f2 | 174 | write_lock(&chan_list_lock); |
9e4425ff | 175 | |
23691d75 | 176 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
177 | err = -EADDRINUSE; |
178 | goto done; | |
9e4425ff GP |
179 | } |
180 | ||
73b2ec18 GP |
181 | if (psm) { |
182 | chan->psm = psm; | |
183 | chan->sport = psm; | |
184 | err = 0; | |
185 | } else { | |
186 | u16 p; | |
187 | ||
188 | err = -EINVAL; | |
189 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 190 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
191 | chan->psm = cpu_to_le16(p); |
192 | chan->sport = cpu_to_le16(p); | |
193 | err = 0; | |
194 | break; | |
195 | } | |
196 | } | |
9e4425ff | 197 | |
73b2ec18 | 198 | done: |
333055f2 | 199 | write_unlock(&chan_list_lock); |
73b2ec18 | 200 | return err; |
9e4425ff GP |
201 | } |
202 | ||
203 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
204 | { | |
333055f2 | 205 | write_lock(&chan_list_lock); |
9e4425ff GP |
206 | |
207 | chan->scid = scid; | |
208 | ||
333055f2 | 209 | write_unlock(&chan_list_lock); |
9e4425ff GP |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
baa7e1fa | 214 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 215 | { |
8db4dc46 | 216 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 217 | |
8db4dc46 | 218 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 219 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
220 | return cid; |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
f93fa273 | 226 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 227 | { |
42d2d87c | 228 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 229 | state_to_string(state)); |
badaaa00 | 230 | |
89bc500e | 231 | chan->state = state; |
53f52121 | 232 | chan->ops->state_change(chan, state, 0); |
89bc500e GP |
233 | } |
234 | ||
f8e73017 GP |
235 | static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, |
236 | int state, int err) | |
2e0052e4 | 237 | { |
f8e73017 | 238 | chan->state = state; |
53f52121 | 239 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
240 | } |
241 | ||
242 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
243 | { | |
f8e73017 | 244 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
245 | } |
246 | ||
4239d16f MM |
247 | static void __set_retrans_timer(struct l2cap_chan *chan) |
248 | { | |
249 | if (!delayed_work_pending(&chan->monitor_timer) && | |
250 | chan->retrans_timeout) { | |
251 | l2cap_set_timer(chan, &chan->retrans_timer, | |
252 | msecs_to_jiffies(chan->retrans_timeout)); | |
253 | } | |
254 | } | |
255 | ||
256 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
257 | { | |
258 | __clear_retrans_timer(chan); | |
259 | if (chan->monitor_timeout) { | |
260 | l2cap_set_timer(chan, &chan->monitor_timer, | |
261 | msecs_to_jiffies(chan->monitor_timeout)); | |
262 | } | |
263 | } | |
264 | ||
608bcc6d MM |
265 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
266 | u16 seq) | |
267 | { | |
268 | struct sk_buff *skb; | |
269 | ||
270 | skb_queue_walk(head, skb) { | |
271 | if (bt_cb(skb)->control.txseq == seq) | |
272 | return skb; | |
273 | } | |
274 | ||
275 | return NULL; | |
276 | } | |
277 | ||
3c588192 MM |
278 | /* ---- L2CAP sequence number lists ---- */ |
279 | ||
280 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
281 | * SREJ requests that are received and for frames that are to be | |
282 | * retransmitted. These seq_list functions implement a singly-linked | |
283 | * list in an array, where membership in the list can also be checked | |
284 | * in constant time. Items can also be added to the tail of the list | |
285 | * and removed from the head in constant time, without further memory | |
286 | * allocs or frees. | |
287 | */ | |
288 | ||
289 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
290 | { | |
291 | size_t alloc_size, i; | |
292 | ||
293 | /* Allocated size is a power of 2 to map sequence numbers | |
294 | * (which may be up to 14 bits) in to a smaller array that is | |
295 | * sized for the negotiated ERTM transmit windows. | |
296 | */ | |
297 | alloc_size = roundup_pow_of_two(size); | |
298 | ||
299 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
300 | if (!seq_list->list) | |
301 | return -ENOMEM; | |
302 | ||
303 | seq_list->mask = alloc_size - 1; | |
304 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
305 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
306 | for (i = 0; i < alloc_size; i++) | |
307 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
313 | { | |
314 | kfree(seq_list->list); | |
315 | } | |
316 | ||
317 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
318 | u16 seq) | |
319 | { | |
320 | /* Constant-time check for list membership */ | |
321 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
322 | } | |
323 | ||
324 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
325 | { | |
326 | u16 mask = seq_list->mask; | |
327 | ||
328 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
329 | /* In case someone tries to pop the head of an empty list */ | |
330 | return L2CAP_SEQ_LIST_CLEAR; | |
331 | } else if (seq_list->head == seq) { | |
332 | /* Head can be removed in constant time */ | |
333 | seq_list->head = seq_list->list[seq & mask]; | |
334 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
335 | ||
336 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
337 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
338 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
339 | } | |
340 | } else { | |
341 | /* Walk the list to find the sequence number */ | |
342 | u16 prev = seq_list->head; | |
343 | while (seq_list->list[prev & mask] != seq) { | |
344 | prev = seq_list->list[prev & mask]; | |
345 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
346 | return L2CAP_SEQ_LIST_CLEAR; | |
347 | } | |
348 | ||
349 | /* Unlink the number from the list and clear it */ | |
350 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
351 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
352 | if (seq_list->tail == seq) | |
353 | seq_list->tail = prev; | |
354 | } | |
355 | return seq; | |
356 | } | |
357 | ||
358 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
359 | { | |
360 | /* Remove the head in constant time */ | |
361 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
362 | } | |
363 | ||
364 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
365 | { | |
f522ae36 | 366 | u16 i; |
3c588192 | 367 | |
f522ae36 GP |
368 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
369 | return; | |
370 | ||
371 | for (i = 0; i <= seq_list->mask; i++) | |
372 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
373 | ||
374 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
375 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
376 | } |
377 | ||
378 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
379 | { | |
380 | u16 mask = seq_list->mask; | |
381 | ||
382 | /* All appends happen in constant time */ | |
383 | ||
f522ae36 GP |
384 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
385 | return; | |
3c588192 | 386 | |
f522ae36 GP |
387 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
388 | seq_list->head = seq; | |
389 | else | |
390 | seq_list->list[seq_list->tail & mask] = seq; | |
391 | ||
392 | seq_list->tail = seq; | |
393 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
394 | } |
395 | ||
721c4181 | 396 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 397 | { |
721c4181 | 398 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 399 | chan_timer.work); |
3df91ea2 | 400 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
401 | int reason; |
402 | ||
e05dcc32 | 403 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 404 | |
3df91ea2 | 405 | mutex_lock(&conn->chan_lock); |
6be36555 | 406 | l2cap_chan_lock(chan); |
ab07801d | 407 | |
89bc500e | 408 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 409 | reason = ECONNREFUSED; |
89bc500e | 410 | else if (chan->state == BT_CONNECT && |
2d792818 | 411 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
412 | reason = ECONNREFUSED; |
413 | else | |
414 | reason = ETIMEDOUT; | |
415 | ||
0f852724 | 416 | l2cap_chan_close(chan, reason); |
ab07801d | 417 | |
6be36555 | 418 | l2cap_chan_unlock(chan); |
ab07801d | 419 | |
80b98027 | 420 | chan->ops->close(chan); |
3df91ea2 AE |
421 | mutex_unlock(&conn->chan_lock); |
422 | ||
371fd835 | 423 | l2cap_chan_put(chan); |
ab07801d GP |
424 | } |
425 | ||
eef1d9b6 | 426 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
427 | { |
428 | struct l2cap_chan *chan; | |
429 | ||
430 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
431 | if (!chan) | |
432 | return NULL; | |
433 | ||
c03b355e AE |
434 | mutex_init(&chan->lock); |
435 | ||
333055f2 | 436 | write_lock(&chan_list_lock); |
23691d75 | 437 | list_add(&chan->global_l, &chan_list); |
333055f2 | 438 | write_unlock(&chan_list_lock); |
23691d75 | 439 | |
721c4181 | 440 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 441 | |
89bc500e GP |
442 | chan->state = BT_OPEN; |
443 | ||
144ad330 | 444 | kref_init(&chan->kref); |
71ba0e56 | 445 | |
2827011f MM |
446 | /* This flag is cleared in l2cap_chan_ready() */ |
447 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
448 | ||
eef1d9b6 | 449 | BT_DBG("chan %p", chan); |
abc545b8 | 450 | |
48454079 GP |
451 | return chan; |
452 | } | |
453 | ||
144ad330 | 454 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 455 | { |
144ad330 SS |
456 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
457 | ||
4af66c69 JK |
458 | BT_DBG("chan %p", chan); |
459 | ||
333055f2 | 460 | write_lock(&chan_list_lock); |
23691d75 | 461 | list_del(&chan->global_l); |
333055f2 | 462 | write_unlock(&chan_list_lock); |
23691d75 | 463 | |
4af66c69 | 464 | kfree(chan); |
6ff5abbf GP |
465 | } |
466 | ||
30648372 JK |
467 | void l2cap_chan_hold(struct l2cap_chan *c) |
468 | { | |
144ad330 | 469 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 470 | |
144ad330 | 471 | kref_get(&c->kref); |
30648372 JK |
472 | } |
473 | ||
474 | void l2cap_chan_put(struct l2cap_chan *c) | |
475 | { | |
144ad330 | 476 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 477 | |
144ad330 | 478 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 JK |
479 | } |
480 | ||
bd4b1653 AE |
481 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
482 | { | |
483 | chan->fcs = L2CAP_FCS_CRC16; | |
484 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
485 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
486 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
c20f8e35 | 487 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 AE |
488 | chan->sec_level = BT_SECURITY_LOW; |
489 | ||
490 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
491 | } | |
492 | ||
93c3e8f5 | 493 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 494 | { |
af05b30b | 495 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 496 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 497 | |
9f5a0d7b | 498 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 499 | |
8c1d787b | 500 | chan->conn = conn; |
0139418c | 501 | |
5491120e AE |
502 | switch (chan->chan_type) { |
503 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
504 | if (conn->hcon->type == LE_LINK) { |
505 | /* LE connection */ | |
6fcb06a2 | 506 | chan->omtu = L2CAP_DEFAULT_MTU; |
9f22398c JH |
507 | if (chan->dcid == L2CAP_CID_ATT) |
508 | chan->scid = L2CAP_CID_ATT; | |
509 | else | |
510 | chan->scid = l2cap_alloc_cid(conn); | |
b62f328b VT |
511 | } else { |
512 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 513 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 514 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 515 | } |
5491120e AE |
516 | break; |
517 | ||
518 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 519 | /* Connectionless socket */ |
fe4128e0 GP |
520 | chan->scid = L2CAP_CID_CONN_LESS; |
521 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 522 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
523 | break; |
524 | ||
416fa752 AE |
525 | case L2CAP_CHAN_CONN_FIX_A2MP: |
526 | chan->scid = L2CAP_CID_A2MP; | |
527 | chan->dcid = L2CAP_CID_A2MP; | |
528 | chan->omtu = L2CAP_A2MP_DEFAULT_MTU; | |
529 | chan->imtu = L2CAP_A2MP_DEFAULT_MTU; | |
530 | break; | |
531 | ||
5491120e | 532 | default: |
0139418c | 533 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
534 | chan->scid = L2CAP_CID_SIGNALING; |
535 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 536 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
537 | } |
538 | ||
8f7975b1 AE |
539 | chan->local_id = L2CAP_BESTEFFORT_ID; |
540 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
541 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
542 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
543 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 544 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 545 | |
371fd835 | 546 | l2cap_chan_hold(chan); |
baa7e1fa | 547 | |
5ee9891d JH |
548 | hci_conn_hold(conn->hcon); |
549 | ||
3df91ea2 | 550 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
551 | } |
552 | ||
466f8004 | 553 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
554 | { |
555 | mutex_lock(&conn->chan_lock); | |
556 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 557 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
558 | } |
559 | ||
466f8004 | 560 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 561 | { |
8c1d787b | 562 | struct l2cap_conn *conn = chan->conn; |
0139418c | 563 | |
c9b66675 | 564 | __clear_chan_timer(chan); |
0139418c | 565 | |
49208c9c | 566 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 567 | |
8e87d142 | 568 | if (conn) { |
56f60984 | 569 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 570 | /* Delete from channel list */ |
3df91ea2 | 571 | list_del(&chan->list); |
3d57dc68 | 572 | |
371fd835 | 573 | l2cap_chan_put(chan); |
baa7e1fa | 574 | |
8c1d787b | 575 | chan->conn = NULL; |
3cabbfda AE |
576 | |
577 | if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP) | |
76a68ba0 | 578 | hci_conn_drop(conn->hcon); |
56f60984 AE |
579 | |
580 | if (mgr && mgr->bredr_chan == chan) | |
581 | mgr->bredr_chan = NULL; | |
0139418c MH |
582 | } |
583 | ||
419e08c1 AE |
584 | if (chan->hs_hchan) { |
585 | struct hci_chan *hs_hchan = chan->hs_hchan; | |
586 | ||
587 | BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); | |
588 | amp_disconnect_logical_link(hs_hchan); | |
589 | } | |
590 | ||
b699ec0d | 591 | chan->ops->teardown(chan, err); |
6be36555 | 592 | |
2827011f | 593 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 594 | return; |
2ead70b8 | 595 | |
ee556f66 GP |
596 | switch(chan->mode) { |
597 | case L2CAP_MODE_BASIC: | |
598 | break; | |
c13ffa62 | 599 | |
ee556f66 | 600 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
601 | __clear_retrans_timer(chan); |
602 | __clear_monitor_timer(chan); | |
603 | __clear_ack_timer(chan); | |
c13ffa62 | 604 | |
f1c6775b | 605 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 606 | |
3c588192 MM |
607 | l2cap_seq_list_free(&chan->srej_list); |
608 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
609 | |
610 | /* fall through */ | |
611 | ||
612 | case L2CAP_MODE_STREAMING: | |
613 | skb_queue_purge(&chan->tx_q); | |
614 | break; | |
c13ffa62 | 615 | } |
ee556f66 GP |
616 | |
617 | return; | |
0139418c MH |
618 | } |
619 | ||
791d60f7 JH |
620 | static void l2cap_chan_connect_reject(struct l2cap_chan *chan) |
621 | { | |
622 | struct l2cap_conn *conn = chan->conn; | |
623 | struct l2cap_conn_rsp rsp; | |
624 | u16 result; | |
625 | ||
626 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
627 | result = L2CAP_CR_SEC_BLOCK; | |
628 | else | |
629 | result = L2CAP_CR_BAD_PSM; | |
630 | ||
631 | l2cap_state_change(chan, BT_DISCONN); | |
632 | ||
633 | rsp.scid = cpu_to_le16(chan->dcid); | |
634 | rsp.dcid = cpu_to_le16(chan->scid); | |
635 | rsp.result = cpu_to_le16(result); | |
636 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
637 | ||
638 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
639 | } | |
640 | ||
0f852724 | 641 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
642 | { |
643 | struct l2cap_conn *conn = chan->conn; | |
4519de9a | 644 | |
7eafc59e | 645 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
4519de9a | 646 | |
89bc500e | 647 | switch (chan->state) { |
4519de9a | 648 | case BT_LISTEN: |
b699ec0d | 649 | chan->ops->teardown(chan, 0); |
4519de9a GP |
650 | break; |
651 | ||
652 | case BT_CONNECTED: | |
653 | case BT_CONFIG: | |
715ec005 | 654 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 655 | conn->hcon->type == ACL_LINK) { |
8d836d71 | 656 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
5e4e3972 | 657 | l2cap_send_disconn_req(chan, reason); |
4519de9a GP |
658 | } else |
659 | l2cap_chan_del(chan, reason); | |
660 | break; | |
661 | ||
662 | case BT_CONNECT2: | |
791d60f7 JH |
663 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
664 | if (conn->hcon->type == ACL_LINK) | |
665 | l2cap_chan_connect_reject(chan); | |
4519de9a GP |
666 | } |
667 | ||
668 | l2cap_chan_del(chan, reason); | |
669 | break; | |
670 | ||
671 | case BT_CONNECT: | |
672 | case BT_DISCONN: | |
673 | l2cap_chan_del(chan, reason); | |
674 | break; | |
675 | ||
676 | default: | |
b699ec0d | 677 | chan->ops->teardown(chan, 0); |
4519de9a GP |
678 | break; |
679 | } | |
680 | } | |
681 | ||
4343478f | 682 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 683 | { |
6a974b50 MH |
684 | switch (chan->chan_type) { |
685 | case L2CAP_CHAN_RAW: | |
4343478f | 686 | switch (chan->sec_level) { |
8556edd3 JH |
687 | case BT_SECURITY_HIGH: |
688 | return HCI_AT_DEDICATED_BONDING_MITM; | |
689 | case BT_SECURITY_MEDIUM: | |
690 | return HCI_AT_DEDICATED_BONDING; | |
691 | default: | |
692 | return HCI_AT_NO_BONDING; | |
693 | } | |
6a974b50 | 694 | break; |
3124b843 MH |
695 | case L2CAP_CHAN_CONN_LESS: |
696 | if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) { | |
697 | if (chan->sec_level == BT_SECURITY_LOW) | |
698 | chan->sec_level = BT_SECURITY_SDP; | |
699 | } | |
700 | if (chan->sec_level == BT_SECURITY_HIGH) | |
701 | return HCI_AT_NO_BONDING_MITM; | |
702 | else | |
703 | return HCI_AT_NO_BONDING; | |
704 | break; | |
6a974b50 MH |
705 | case L2CAP_CHAN_CONN_ORIENTED: |
706 | if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { | |
707 | if (chan->sec_level == BT_SECURITY_LOW) | |
708 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 709 | |
6a974b50 MH |
710 | if (chan->sec_level == BT_SECURITY_HIGH) |
711 | return HCI_AT_NO_BONDING_MITM; | |
712 | else | |
713 | return HCI_AT_NO_BONDING; | |
714 | } | |
715 | /* fall through */ | |
716 | default: | |
4343478f | 717 | switch (chan->sec_level) { |
00ae4af9 | 718 | case BT_SECURITY_HIGH: |
8556edd3 | 719 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 720 | case BT_SECURITY_MEDIUM: |
8556edd3 | 721 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 722 | default: |
8556edd3 | 723 | return HCI_AT_NO_BONDING; |
00ae4af9 | 724 | } |
6a974b50 | 725 | break; |
0684e5f9 | 726 | } |
8556edd3 JH |
727 | } |
728 | ||
729 | /* Service level security */ | |
d45fc423 | 730 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 731 | { |
8c1d787b | 732 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
733 | __u8 auth_type; |
734 | ||
a17de2fe JH |
735 | if (conn->hcon->type == LE_LINK) |
736 | return smp_conn_security(conn->hcon, chan->sec_level); | |
737 | ||
4343478f | 738 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 739 | |
4343478f | 740 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
741 | } |
742 | ||
b5ad8b7f | 743 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
744 | { |
745 | u8 id; | |
746 | ||
747 | /* Get next available identificator. | |
748 | * 1 - 128 are used by kernel. | |
749 | * 129 - 199 are reserved. | |
750 | * 200 - 254 are used by utilities like l2ping, etc. | |
751 | */ | |
752 | ||
333055f2 | 753 | spin_lock(&conn->lock); |
4e8402a3 MH |
754 | |
755 | if (++conn->tx_ident > 128) | |
756 | conn->tx_ident = 1; | |
757 | ||
758 | id = conn->tx_ident; | |
759 | ||
333055f2 | 760 | spin_unlock(&conn->lock); |
4e8402a3 MH |
761 | |
762 | return id; | |
763 | } | |
764 | ||
2d792818 GP |
765 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
766 | void *data) | |
4e8402a3 MH |
767 | { |
768 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 769 | u8 flags; |
4e8402a3 MH |
770 | |
771 | BT_DBG("code 0x%2.2x", code); | |
772 | ||
773 | if (!skb) | |
9a9c6a34 | 774 | return; |
4e8402a3 | 775 | |
e702112f AE |
776 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
777 | flags = ACL_START_NO_FLUSH; | |
778 | else | |
779 | flags = ACL_START; | |
780 | ||
14b12d0b | 781 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 782 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 783 | |
73d80deb LAD |
784 | hci_send_acl(conn->hchan, skb, flags); |
785 | } | |
786 | ||
02b0fbb9 MM |
787 | static bool __chan_is_moving(struct l2cap_chan *chan) |
788 | { | |
789 | return chan->move_state != L2CAP_MOVE_STABLE && | |
790 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
791 | } | |
792 | ||
73d80deb LAD |
793 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
794 | { | |
795 | struct hci_conn *hcon = chan->conn->hcon; | |
796 | u16 flags; | |
797 | ||
798 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 799 | skb->priority); |
73d80deb | 800 | |
d5f8a75d MM |
801 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
802 | if (chan->hs_hchan) | |
803 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
804 | else | |
805 | kfree_skb(skb); | |
806 | ||
807 | return; | |
808 | } | |
809 | ||
73d80deb | 810 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
2d792818 | 811 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
812 | flags = ACL_START_NO_FLUSH; |
813 | else | |
814 | flags = ACL_START; | |
14b12d0b | 815 | |
73d80deb LAD |
816 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
817 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
818 | } |
819 | ||
b76bbd66 MM |
820 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
821 | { | |
822 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
823 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
824 | ||
825 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
826 | /* S-Frame */ | |
827 | control->sframe = 1; | |
828 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
829 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
830 | ||
831 | control->sar = 0; | |
832 | control->txseq = 0; | |
833 | } else { | |
834 | /* I-Frame */ | |
835 | control->sframe = 0; | |
836 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
837 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
838 | ||
839 | control->poll = 0; | |
840 | control->super = 0; | |
841 | } | |
842 | } | |
843 | ||
b76bbd66 MM |
844 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
845 | { | |
846 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
847 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
848 | ||
849 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
850 | /* S-Frame */ | |
851 | control->sframe = 1; | |
852 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
853 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
854 | ||
855 | control->sar = 0; | |
856 | control->txseq = 0; | |
857 | } else { | |
858 | /* I-Frame */ | |
859 | control->sframe = 0; | |
860 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
861 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
862 | ||
863 | control->poll = 0; | |
864 | control->super = 0; | |
865 | } | |
866 | } | |
867 | ||
868 | static inline void __unpack_control(struct l2cap_chan *chan, | |
869 | struct sk_buff *skb) | |
870 | { | |
871 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
872 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
873 | &bt_cb(skb)->control); | |
cec8ab6e | 874 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
875 | } else { |
876 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
877 | &bt_cb(skb)->control); | |
cec8ab6e | 878 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
879 | } |
880 | } | |
881 | ||
b5c6aaed MM |
882 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
883 | { | |
884 | u32 packed; | |
885 | ||
886 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
887 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
888 | ||
889 | if (control->sframe) { | |
890 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
891 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
892 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
893 | } else { | |
894 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
895 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
896 | } | |
897 | ||
898 | return packed; | |
899 | } | |
900 | ||
901 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
902 | { | |
903 | u16 packed; | |
904 | ||
905 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
906 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
907 | ||
908 | if (control->sframe) { | |
909 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
910 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
911 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
912 | } else { | |
913 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
914 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
915 | } | |
916 | ||
917 | return packed; | |
918 | } | |
919 | ||
b76bbd66 MM |
920 | static inline void __pack_control(struct l2cap_chan *chan, |
921 | struct l2cap_ctrl *control, | |
922 | struct sk_buff *skb) | |
923 | { | |
924 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
925 | put_unaligned_le32(__pack_extended_control(control), | |
926 | skb->data + L2CAP_HDR_SIZE); | |
927 | } else { | |
928 | put_unaligned_le16(__pack_enhanced_control(control), | |
929 | skb->data + L2CAP_HDR_SIZE); | |
930 | } | |
931 | } | |
932 | ||
ba7aa64f GP |
933 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
934 | { | |
935 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
936 | return L2CAP_EXT_HDR_SIZE; | |
937 | else | |
938 | return L2CAP_ENH_HDR_SIZE; | |
939 | } | |
940 | ||
a67d7f6f MM |
941 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
942 | u32 control) | |
b5c6aaed MM |
943 | { |
944 | struct sk_buff *skb; | |
945 | struct l2cap_hdr *lh; | |
ba7aa64f | 946 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
947 | |
948 | if (chan->fcs == L2CAP_FCS_CRC16) | |
949 | hlen += L2CAP_FCS_SIZE; | |
950 | ||
a67d7f6f | 951 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 952 | |
b5c6aaed | 953 | if (!skb) |
a67d7f6f | 954 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
955 | |
956 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
957 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
958 | lh->cid = cpu_to_le16(chan->dcid); | |
959 | ||
a67d7f6f MM |
960 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
961 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
962 | else | |
963 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
964 | |
965 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 966 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
967 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
968 | } | |
969 | ||
970 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
971 | return skb; |
972 | } | |
973 | ||
974 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
975 | struct l2cap_ctrl *control) | |
976 | { | |
977 | struct sk_buff *skb; | |
978 | u32 control_field; | |
979 | ||
980 | BT_DBG("chan %p, control %p", chan, control); | |
981 | ||
982 | if (!control->sframe) | |
983 | return; | |
984 | ||
b99e13ad MM |
985 | if (__chan_is_moving(chan)) |
986 | return; | |
987 | ||
a67d7f6f MM |
988 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
989 | !control->poll) | |
990 | control->final = 1; | |
991 | ||
992 | if (control->super == L2CAP_SUPER_RR) | |
993 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
994 | else if (control->super == L2CAP_SUPER_RNR) | |
995 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
996 | ||
997 | if (control->super != L2CAP_SUPER_SREJ) { | |
998 | chan->last_acked_seq = control->reqseq; | |
999 | __clear_ack_timer(chan); | |
1000 | } | |
1001 | ||
1002 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
1003 | control->final, control->poll, control->super); | |
1004 | ||
1005 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1006 | control_field = __pack_extended_control(control); | |
1007 | else | |
1008 | control_field = __pack_enhanced_control(control); | |
1009 | ||
1010 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
1011 | if (!IS_ERR(skb)) | |
1012 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
1013 | } |
1014 | ||
c9e3d5e0 | 1015 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 1016 | { |
c9e3d5e0 MM |
1017 | struct l2cap_ctrl control; |
1018 | ||
1019 | BT_DBG("chan %p, poll %d", chan, poll); | |
1020 | ||
1021 | memset(&control, 0, sizeof(control)); | |
1022 | control.sframe = 1; | |
1023 | control.poll = poll; | |
1024 | ||
1025 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
1026 | control.super = L2CAP_SUPER_RNR; | |
1027 | else | |
1028 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1029 | |
c9e3d5e0 MM |
1030 | control.reqseq = chan->buffer_seq; |
1031 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1032 | } |
1033 | ||
b4450035 | 1034 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1035 | { |
c1360a1c | 1036 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1037 | } |
1038 | ||
1df7b17a | 1039 | static bool __amp_capable(struct l2cap_chan *chan) |
80d58d0b | 1040 | { |
1df7b17a | 1041 | struct l2cap_conn *conn = chan->conn; |
80d58d0b | 1042 | struct hci_dev *hdev; |
1df7b17a MH |
1043 | bool amp_available = false; |
1044 | ||
1045 | if (!conn->hs_enabled) | |
1046 | return false; | |
1047 | ||
1048 | if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP)) | |
1049 | return false; | |
80d58d0b MH |
1050 | |
1051 | read_lock(&hci_dev_list_lock); | |
1df7b17a | 1052 | list_for_each_entry(hdev, &hci_dev_list, list) { |
80d58d0b | 1053 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1df7b17a MH |
1054 | test_bit(HCI_UP, &hdev->flags)) { |
1055 | amp_available = true; | |
1056 | break; | |
1057 | } | |
1058 | } | |
80d58d0b MH |
1059 | read_unlock(&hci_dev_list_lock); |
1060 | ||
1df7b17a MH |
1061 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1062 | return amp_available; | |
848566b3 MH |
1063 | |
1064 | return false; | |
93c3e8f5 AE |
1065 | } |
1066 | ||
5ce66b59 AE |
1067 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1068 | { | |
1069 | /* Check EFS parameters */ | |
1070 | return true; | |
1071 | } | |
1072 | ||
2766be48 | 1073 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1074 | { |
1075 | struct l2cap_conn *conn = chan->conn; | |
1076 | struct l2cap_conn_req req; | |
1077 | ||
1078 | req.scid = cpu_to_le16(chan->scid); | |
1079 | req.psm = chan->psm; | |
1080 | ||
1081 | chan->ident = l2cap_get_ident(conn); | |
1082 | ||
1083 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1084 | ||
1085 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1086 | } | |
1087 | ||
8eb200bd MM |
1088 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1089 | { | |
1090 | struct l2cap_create_chan_req req; | |
1091 | req.scid = cpu_to_le16(chan->scid); | |
1092 | req.psm = chan->psm; | |
1093 | req.amp_id = amp_id; | |
1094 | ||
1095 | chan->ident = l2cap_get_ident(chan->conn); | |
1096 | ||
1097 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1098 | sizeof(req), &req); | |
1099 | } | |
1100 | ||
02b0fbb9 MM |
1101 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1102 | { | |
1103 | struct sk_buff *skb; | |
1104 | ||
1105 | BT_DBG("chan %p", chan); | |
1106 | ||
1107 | if (chan->mode != L2CAP_MODE_ERTM) | |
1108 | return; | |
1109 | ||
1110 | __clear_retrans_timer(chan); | |
1111 | __clear_monitor_timer(chan); | |
1112 | __clear_ack_timer(chan); | |
1113 | ||
1114 | chan->retry_count = 0; | |
1115 | skb_queue_walk(&chan->tx_q, skb) { | |
1116 | if (bt_cb(skb)->control.retries) | |
1117 | bt_cb(skb)->control.retries = 1; | |
1118 | else | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | chan->expected_tx_seq = chan->buffer_seq; | |
1123 | ||
1124 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1125 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1126 | l2cap_seq_list_clear(&chan->retrans_list); | |
1127 | l2cap_seq_list_clear(&chan->srej_list); | |
1128 | skb_queue_purge(&chan->srej_q); | |
1129 | ||
1130 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1131 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1132 | ||
1133 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1134 | } | |
1135 | ||
5f3847a4 MM |
1136 | static void l2cap_move_done(struct l2cap_chan *chan) |
1137 | { | |
1138 | u8 move_role = chan->move_role; | |
1139 | BT_DBG("chan %p", chan); | |
1140 | ||
1141 | chan->move_state = L2CAP_MOVE_STABLE; | |
1142 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1143 | ||
1144 | if (chan->mode != L2CAP_MODE_ERTM) | |
1145 | return; | |
1146 | ||
1147 | switch (move_role) { | |
1148 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1149 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1150 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1151 | break; | |
1152 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1153 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1154 | break; | |
1155 | } | |
1156 | } | |
1157 | ||
9f0caeb1 VCG |
1158 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1159 | { | |
2827011f | 1160 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1161 | chan->conf_state = 0; |
1162 | __clear_chan_timer(chan); | |
1163 | ||
54a59aa2 | 1164 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1165 | |
fd83e2c2 | 1166 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1167 | } |
1168 | ||
f1496dee JH |
1169 | static void l2cap_le_connect(struct l2cap_chan *chan) |
1170 | { | |
1171 | struct l2cap_conn *conn = chan->conn; | |
1172 | struct l2cap_le_conn_req req; | |
1173 | ||
1174 | req.psm = chan->psm; | |
1175 | req.scid = cpu_to_le16(chan->scid); | |
1176 | req.mtu = cpu_to_le16(chan->imtu); | |
1177 | req.mps = __constant_cpu_to_le16(L2CAP_LE_DEFAULT_MPS); | |
1178 | req.credits = __constant_cpu_to_le16(L2CAP_LE_MAX_CREDITS); | |
1179 | ||
1180 | chan->ident = l2cap_get_ident(conn); | |
1181 | ||
1182 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, | |
1183 | sizeof(req), &req); | |
1184 | } | |
1185 | ||
1186 | static void l2cap_le_start(struct l2cap_chan *chan) | |
1187 | { | |
1188 | struct l2cap_conn *conn = chan->conn; | |
1189 | ||
1190 | if (!smp_conn_security(conn->hcon, chan->sec_level)) | |
1191 | return; | |
1192 | ||
1193 | if (!chan->psm) { | |
1194 | l2cap_chan_ready(chan); | |
1195 | return; | |
1196 | } | |
1197 | ||
1198 | if (chan->state == BT_CONNECT) | |
1199 | l2cap_le_connect(chan); | |
1200 | } | |
1201 | ||
93c3e8f5 AE |
1202 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1203 | { | |
1204 | if (__amp_capable(chan)) { | |
1205 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1206 | a2mp_discover_amp(chan); | |
f1496dee JH |
1207 | } else if (chan->conn->hcon->type == LE_LINK) { |
1208 | l2cap_le_start(chan); | |
93c3e8f5 AE |
1209 | } else { |
1210 | l2cap_send_conn_req(chan); | |
1211 | } | |
1212 | } | |
1213 | ||
fc7f8a7e | 1214 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1215 | { |
8c1d787b | 1216 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1217 | |
9f0caeb1 | 1218 | if (conn->hcon->type == LE_LINK) { |
96ac34fb | 1219 | l2cap_le_start(chan); |
9f0caeb1 VCG |
1220 | return; |
1221 | } | |
1222 | ||
79d554a6 | 1223 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1224 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1225 | return; | |
1226 | ||
d45fc423 | 1227 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1228 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1229 | l2cap_start_connection(chan); |
1230 | } | |
79d554a6 MH |
1231 | } else { |
1232 | struct l2cap_info_req req; | |
ac73498c | 1233 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1234 | |
1235 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1236 | conn->info_ident = l2cap_get_ident(conn); | |
1237 | ||
ba13ccd9 | 1238 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1239 | |
2d792818 GP |
1240 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1241 | sizeof(req), &req); | |
79d554a6 MH |
1242 | } |
1243 | } | |
1244 | ||
cf6c2c0b GP |
1245 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1246 | { | |
1247 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1248 | if (!disable_ertm) |
cf6c2c0b GP |
1249 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1250 | ||
1251 | switch (mode) { | |
1252 | case L2CAP_MODE_ERTM: | |
1253 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1254 | case L2CAP_MODE_STREAMING: | |
1255 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1256 | default: | |
1257 | return 0x00; | |
1258 | } | |
1259 | } | |
1260 | ||
5e4e3972 | 1261 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1262 | { |
5e4e3972 | 1263 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1264 | struct l2cap_disconn_req req; |
1265 | ||
c13ffa62 GP |
1266 | if (!conn) |
1267 | return; | |
1268 | ||
aad3d0e3 | 1269 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1270 | __clear_retrans_timer(chan); |
1271 | __clear_monitor_timer(chan); | |
1272 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1273 | } |
1274 | ||
416fa752 | 1275 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
d117773c | 1276 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1277 | return; |
1278 | } | |
1279 | ||
fe4128e0 GP |
1280 | req.dcid = cpu_to_le16(chan->dcid); |
1281 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1282 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1283 | sizeof(req), &req); | |
c13ffa62 | 1284 | |
f8e73017 | 1285 | l2cap_state_change_and_error(chan, BT_DISCONN, err); |
22121fc9 GP |
1286 | } |
1287 | ||
1da177e4 | 1288 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1289 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1290 | { | |
3df91ea2 | 1291 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1292 | |
1293 | BT_DBG("conn %p", conn); | |
1294 | ||
3df91ea2 | 1295 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1296 | |
3df91ea2 | 1297 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6be36555 | 1298 | l2cap_chan_lock(chan); |
4e8402a3 | 1299 | |
715ec005 | 1300 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1301 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1302 | continue; |
1303 | } | |
1304 | ||
89bc500e | 1305 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1306 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1307 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1308 | l2cap_chan_unlock(chan); |
47731de7 GP |
1309 | continue; |
1310 | } | |
79d554a6 | 1311 | |
c1360a1c | 1312 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1313 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1314 | &chan->conf_state)) { |
89bc500e | 1315 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1316 | l2cap_chan_unlock(chan); |
47731de7 | 1317 | continue; |
b1235d79 | 1318 | } |
47731de7 | 1319 | |
93c3e8f5 | 1320 | l2cap_start_connection(chan); |
47731de7 | 1321 | |
89bc500e | 1322 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1323 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1324 | char buf[128]; |
fe4128e0 GP |
1325 | rsp.scid = cpu_to_le16(chan->dcid); |
1326 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1327 | |
d45fc423 | 1328 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 1329 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
ac73498c AE |
1330 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1331 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1332 | chan->ops->defer(chan); |
f66dc81f MH |
1333 | |
1334 | } else { | |
acdcabf5 | 1335 | l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1336 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1337 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1338 | } |
79d554a6 | 1339 | } else { |
ac73498c AE |
1340 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1341 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1342 | } |
1343 | ||
fc7f8a7e | 1344 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1345 | sizeof(rsp), &rsp); |
e9aeb2dd | 1346 | |
c1360a1c | 1347 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1348 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1349 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1350 | continue; |
1351 | } | |
1352 | ||
c1360a1c | 1353 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1354 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1355 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1356 | chan->num_conf_req++; |
4e8402a3 MH |
1357 | } |
1358 | ||
6be36555 | 1359 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1360 | } |
1361 | ||
3df91ea2 | 1362 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1363 | } |
1364 | ||
c2287681 | 1365 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1366 | * Returns closest match, locked. |
1367 | */ | |
d9b88702 | 1368 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1369 | bdaddr_t *src, |
1370 | bdaddr_t *dst) | |
b62f328b | 1371 | { |
23691d75 | 1372 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1373 | |
23691d75 | 1374 | read_lock(&chan_list_lock); |
b62f328b | 1375 | |
23691d75 | 1376 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1377 | if (state && c->state != state) |
b62f328b VT |
1378 | continue; |
1379 | ||
23691d75 | 1380 | if (c->scid == cid) { |
c2287681 IY |
1381 | int src_match, dst_match; |
1382 | int src_any, dst_any; | |
1383 | ||
b62f328b | 1384 | /* Exact match. */ |
7eafc59e MH |
1385 | src_match = !bacmp(&c->src, src); |
1386 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1387 | if (src_match && dst_match) { |
23691d75 GP |
1388 | read_unlock(&chan_list_lock); |
1389 | return c; | |
1390 | } | |
b62f328b VT |
1391 | |
1392 | /* Closest match */ | |
7eafc59e MH |
1393 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1394 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1395 | if ((src_match && dst_any) || (src_any && dst_match) || |
1396 | (src_any && dst_any)) | |
23691d75 | 1397 | c1 = c; |
b62f328b VT |
1398 | } |
1399 | } | |
280f294f | 1400 | |
23691d75 | 1401 | read_unlock(&chan_list_lock); |
b62f328b | 1402 | |
23691d75 | 1403 | return c1; |
b62f328b VT |
1404 | } |
1405 | ||
1406 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1407 | { | |
cc8dba2b | 1408 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 1409 | struct l2cap_chan *chan, *pchan; |
cc8dba2b | 1410 | u8 dst_type; |
b62f328b VT |
1411 | |
1412 | BT_DBG(""); | |
1413 | ||
1414 | /* Check if we have socket listening on cid */ | |
073d1cf3 | 1415 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT, |
cc8dba2b | 1416 | &hcon->src, &hcon->dst); |
23691d75 | 1417 | if (!pchan) |
b62f328b VT |
1418 | return; |
1419 | ||
44f3b0fb JH |
1420 | /* Client ATT sockets should override the server one */ |
1421 | if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT)) | |
1422 | return; | |
1423 | ||
cc8dba2b MH |
1424 | dst_type = bdaddr_type(hcon, hcon->dst_type); |
1425 | ||
1426 | /* If device is blocked, do not create a channel for it */ | |
1427 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type)) | |
1428 | return; | |
1429 | ||
8ffb9290 | 1430 | l2cap_chan_lock(pchan); |
62f3a2cf | 1431 | |
80b98027 | 1432 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1433 | if (!chan) |
b62f328b VT |
1434 | goto clean; |
1435 | ||
9f22398c JH |
1436 | chan->dcid = L2CAP_CID_ATT; |
1437 | ||
cc8dba2b MH |
1438 | bacpy(&chan->src, &hcon->src); |
1439 | bacpy(&chan->dst, &hcon->dst); | |
1440 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
1441 | chan->dst_type = dst_type; | |
b62f328b | 1442 | |
44f3b0fb | 1443 | __l2cap_chan_add(conn, chan); |
48454079 | 1444 | |
b62f328b | 1445 | clean: |
8ffb9290 | 1446 | l2cap_chan_unlock(pchan); |
b62f328b VT |
1447 | } |
1448 | ||
4e8402a3 MH |
1449 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1450 | { | |
48454079 | 1451 | struct l2cap_chan *chan; |
cc110922 | 1452 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1453 | |
79d554a6 | 1454 | BT_DBG("conn %p", conn); |
4e8402a3 | 1455 | |
d8729922 JH |
1456 | /* For outgoing pairing which doesn't necessarily have an |
1457 | * associated socket (e.g. mgmt_pair_device). | |
1458 | */ | |
cc110922 VCG |
1459 | if (hcon->out && hcon->type == LE_LINK) |
1460 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1461 | |
3df91ea2 | 1462 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1463 | |
44f3b0fb JH |
1464 | if (hcon->type == LE_LINK) |
1465 | l2cap_le_conn_ready(conn); | |
1466 | ||
3df91ea2 | 1467 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1468 | |
6be36555 | 1469 | l2cap_chan_lock(chan); |
4e8402a3 | 1470 | |
416fa752 AE |
1471 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1472 | l2cap_chan_unlock(chan); | |
1473 | continue; | |
1474 | } | |
1475 | ||
cc110922 | 1476 | if (hcon->type == LE_LINK) { |
f1496dee | 1477 | l2cap_le_start(chan); |
63128451 | 1478 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
74e75740 | 1479 | l2cap_chan_ready(chan); |
b501d6a1 | 1480 | |
1c244f79 | 1481 | } else if (chan->state == BT_CONNECT) { |
fc7f8a7e | 1482 | l2cap_do_start(chan); |
1c244f79 | 1483 | } |
4e8402a3 | 1484 | |
6be36555 | 1485 | l2cap_chan_unlock(chan); |
4e8402a3 | 1486 | } |
79d554a6 | 1487 | |
3df91ea2 | 1488 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1489 | } |
1490 | ||
1491 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1492 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1493 | { | |
48454079 | 1494 | struct l2cap_chan *chan; |
4e8402a3 MH |
1495 | |
1496 | BT_DBG("conn %p", conn); | |
1497 | ||
3df91ea2 | 1498 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1499 | |
3df91ea2 | 1500 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1501 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1502 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1503 | } |
1504 | ||
3df91ea2 | 1505 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1506 | } |
1507 | ||
f878fcad | 1508 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1509 | { |
f878fcad | 1510 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1511 | info_timer.work); |
4e8402a3 | 1512 | |
984947dc | 1513 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1514 | conn->info_ident = 0; |
984947dc | 1515 | |
4e8402a3 MH |
1516 | l2cap_conn_start(conn); |
1517 | } | |
1518 | ||
2c8e1411 DH |
1519 | /* |
1520 | * l2cap_user | |
1521 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1522 | * callback is called during registration. The ->remove callback is called | |
1523 | * during unregistration. | |
1524 | * An l2cap_user object can either be explicitly unregistered or when the | |
1525 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1526 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1527 | * External modules must own a reference to the l2cap_conn object if they intend | |
1528 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1529 | * any time if they don't. | |
1530 | */ | |
1531 | ||
1532 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1533 | { | |
1534 | struct hci_dev *hdev = conn->hcon->hdev; | |
1535 | int ret; | |
1536 | ||
1537 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1538 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1539 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1540 | * relies on the parent hci_conn object to be locked. This itself relies | |
1541 | * on the hci_dev object to be locked. So we must lock the hci device | |
1542 | * here, too. */ | |
1543 | ||
1544 | hci_dev_lock(hdev); | |
1545 | ||
1546 | if (user->list.next || user->list.prev) { | |
1547 | ret = -EINVAL; | |
1548 | goto out_unlock; | |
1549 | } | |
1550 | ||
1551 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1552 | if (!conn->hchan) { | |
1553 | ret = -ENODEV; | |
1554 | goto out_unlock; | |
1555 | } | |
1556 | ||
1557 | ret = user->probe(conn, user); | |
1558 | if (ret) | |
1559 | goto out_unlock; | |
1560 | ||
1561 | list_add(&user->list, &conn->users); | |
1562 | ret = 0; | |
1563 | ||
1564 | out_unlock: | |
1565 | hci_dev_unlock(hdev); | |
1566 | return ret; | |
1567 | } | |
1568 | EXPORT_SYMBOL(l2cap_register_user); | |
1569 | ||
1570 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1571 | { | |
1572 | struct hci_dev *hdev = conn->hcon->hdev; | |
1573 | ||
1574 | hci_dev_lock(hdev); | |
1575 | ||
1576 | if (!user->list.next || !user->list.prev) | |
1577 | goto out_unlock; | |
1578 | ||
1579 | list_del(&user->list); | |
1580 | user->list.next = NULL; | |
1581 | user->list.prev = NULL; | |
1582 | user->remove(conn, user); | |
1583 | ||
1584 | out_unlock: | |
1585 | hci_dev_unlock(hdev); | |
1586 | } | |
1587 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1588 | ||
1589 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1590 | { | |
1591 | struct l2cap_user *user; | |
1592 | ||
1593 | while (!list_empty(&conn->users)) { | |
1594 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1595 | list_del(&user->list); | |
1596 | user->list.next = NULL; | |
1597 | user->list.prev = NULL; | |
1598 | user->remove(conn, user); | |
1599 | } | |
1600 | } | |
1601 | ||
5d3de7df VCG |
1602 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1603 | { | |
1604 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1605 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1606 | |
1607 | if (!conn) | |
1608 | return; | |
1609 | ||
1610 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1611 | ||
1612 | kfree_skb(conn->rx_skb); | |
1613 | ||
2c8e1411 DH |
1614 | l2cap_unregister_all_users(conn); |
1615 | ||
3df91ea2 AE |
1616 | mutex_lock(&conn->chan_lock); |
1617 | ||
5d3de7df VCG |
1618 | /* Kill channels */ |
1619 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1620 | l2cap_chan_hold(chan); |
6be36555 AE |
1621 | l2cap_chan_lock(chan); |
1622 | ||
5d3de7df | 1623 | l2cap_chan_del(chan, err); |
6be36555 AE |
1624 | |
1625 | l2cap_chan_unlock(chan); | |
1626 | ||
80b98027 | 1627 | chan->ops->close(chan); |
61d6ef3e | 1628 | l2cap_chan_put(chan); |
5d3de7df VCG |
1629 | } |
1630 | ||
3df91ea2 AE |
1631 | mutex_unlock(&conn->chan_lock); |
1632 | ||
73d80deb LAD |
1633 | hci_chan_del(conn->hchan); |
1634 | ||
5d3de7df | 1635 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1636 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1637 | |
51a8efd7 | 1638 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1639 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1640 | smp_chan_destroy(conn); |
d26a2345 | 1641 | } |
5d3de7df VCG |
1642 | |
1643 | hcon->l2cap_data = NULL; | |
9c903e37 DH |
1644 | conn->hchan = NULL; |
1645 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1646 | } |
1647 | ||
6c9d42a1 | 1648 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1649 | { |
6c9d42a1 | 1650 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1651 | security_timer.work); |
5d3de7df | 1652 | |
d06cc416 JH |
1653 | BT_DBG("conn %p", conn); |
1654 | ||
1655 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1656 | smp_chan_destroy(conn); | |
1657 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1658 | } | |
5d3de7df VCG |
1659 | } |
1660 | ||
baf43251 | 1661 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
1da177e4 | 1662 | { |
0139418c | 1663 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1664 | struct hci_chan *hchan; |
1da177e4 | 1665 | |
baf43251 | 1666 | if (conn) |
1da177e4 LT |
1667 | return conn; |
1668 | ||
73d80deb LAD |
1669 | hchan = hci_chan_create(hcon); |
1670 | if (!hchan) | |
1671 | return NULL; | |
1672 | ||
8bcde1f2 | 1673 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
73d80deb LAD |
1674 | if (!conn) { |
1675 | hci_chan_del(hchan); | |
1da177e4 | 1676 | return NULL; |
73d80deb | 1677 | } |
1da177e4 | 1678 | |
9c903e37 | 1679 | kref_init(&conn->ref); |
1da177e4 LT |
1680 | hcon->l2cap_data = conn; |
1681 | conn->hcon = hcon; | |
9c903e37 | 1682 | hci_conn_get(conn->hcon); |
73d80deb | 1683 | conn->hchan = hchan; |
1da177e4 | 1684 | |
73d80deb | 1685 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1686 | |
dcc042d5 | 1687 | switch (hcon->type) { |
dcc042d5 AE |
1688 | case LE_LINK: |
1689 | if (hcon->hdev->le_mtu) { | |
1690 | conn->mtu = hcon->hdev->le_mtu; | |
1691 | break; | |
1692 | } | |
1693 | /* fall through */ | |
dcc042d5 | 1694 | default: |
acd7d370 | 1695 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1696 | break; |
1697 | } | |
acd7d370 | 1698 | |
4e8402a3 MH |
1699 | conn->feat_mask = 0; |
1700 | ||
848566b3 MH |
1701 | if (hcon->type == ACL_LINK) |
1702 | conn->hs_enabled = test_bit(HCI_HS_ENABLED, | |
1703 | &hcon->hdev->dev_flags); | |
1704 | ||
1da177e4 | 1705 | spin_lock_init(&conn->lock); |
3df91ea2 | 1706 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1707 | |
1708 | INIT_LIST_HEAD(&conn->chan_l); | |
2c8e1411 | 1709 | INIT_LIST_HEAD(&conn->users); |
1da177e4 | 1710 | |
5d3de7df | 1711 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1712 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1713 | else |
030013d8 | 1714 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1715 | |
9f5a0d7b | 1716 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1717 | |
1da177e4 LT |
1718 | return conn; |
1719 | } | |
1720 | ||
9c903e37 DH |
1721 | static void l2cap_conn_free(struct kref *ref) |
1722 | { | |
1723 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1724 | ||
1725 | hci_conn_put(conn->hcon); | |
1726 | kfree(conn); | |
1727 | } | |
1728 | ||
1729 | void l2cap_conn_get(struct l2cap_conn *conn) | |
1730 | { | |
1731 | kref_get(&conn->ref); | |
1732 | } | |
1733 | EXPORT_SYMBOL(l2cap_conn_get); | |
1734 | ||
1735 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1736 | { | |
1737 | kref_put(&conn->ref, l2cap_conn_free); | |
1738 | } | |
1739 | EXPORT_SYMBOL(l2cap_conn_put); | |
1740 | ||
1da177e4 | 1741 | /* ---- Socket interface ---- */ |
1da177e4 | 1742 | |
c2287681 | 1743 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1744 | * Returns closest match. |
1745 | */ | |
c2287681 IY |
1746 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1747 | bdaddr_t *src, | |
bf20fd4e JH |
1748 | bdaddr_t *dst, |
1749 | u8 link_type) | |
1da177e4 | 1750 | { |
23691d75 | 1751 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1752 | |
23691d75 | 1753 | read_lock(&chan_list_lock); |
e0f0cb56 | 1754 | |
23691d75 | 1755 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1756 | if (state && c->state != state) |
1da177e4 LT |
1757 | continue; |
1758 | ||
bf20fd4e JH |
1759 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1760 | continue; | |
1761 | ||
1762 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
1763 | continue; | |
1764 | ||
23691d75 | 1765 | if (c->psm == psm) { |
c2287681 IY |
1766 | int src_match, dst_match; |
1767 | int src_any, dst_any; | |
1768 | ||
1da177e4 | 1769 | /* Exact match. */ |
7eafc59e MH |
1770 | src_match = !bacmp(&c->src, src); |
1771 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1772 | if (src_match && dst_match) { |
a7567b20 | 1773 | read_unlock(&chan_list_lock); |
23691d75 GP |
1774 | return c; |
1775 | } | |
1da177e4 LT |
1776 | |
1777 | /* Closest match */ | |
7eafc59e MH |
1778 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1779 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1780 | if ((src_match && dst_any) || (src_any && dst_match) || |
1781 | (src_any && dst_any)) | |
23691d75 | 1782 | c1 = c; |
1da177e4 LT |
1783 | } |
1784 | } | |
1da177e4 | 1785 | |
23691d75 | 1786 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1787 | |
23691d75 | 1788 | return c1; |
1da177e4 LT |
1789 | } |
1790 | ||
8e9f9892 AG |
1791 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1792 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1793 | { |
1da177e4 LT |
1794 | struct l2cap_conn *conn; |
1795 | struct hci_conn *hcon; | |
1796 | struct hci_dev *hdev; | |
09ab6f4c | 1797 | __u8 auth_type; |
44d0e48e | 1798 | int err; |
1da177e4 | 1799 | |
7eafc59e | 1800 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, |
ab19516a | 1801 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1802 | |
7eafc59e | 1803 | hdev = hci_get_route(dst, &chan->src); |
af05b30b | 1804 | if (!hdev) |
1da177e4 LT |
1805 | return -EHOSTUNREACH; |
1806 | ||
09fd0de5 | 1807 | hci_dev_lock(hdev); |
1da177e4 | 1808 | |
6be36555 | 1809 | l2cap_chan_lock(chan); |
03a00194 GP |
1810 | |
1811 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1812 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
2d792818 | 1813 | chan->chan_type != L2CAP_CHAN_RAW) { |
03a00194 GP |
1814 | err = -EINVAL; |
1815 | goto done; | |
1816 | } | |
1817 | ||
1818 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1819 | err = -EINVAL; | |
1820 | goto done; | |
1821 | } | |
1822 | ||
1823 | switch (chan->mode) { | |
1824 | case L2CAP_MODE_BASIC: | |
1825 | break; | |
1826 | case L2CAP_MODE_ERTM: | |
1827 | case L2CAP_MODE_STREAMING: | |
1828 | if (!disable_ertm) | |
1829 | break; | |
1830 | /* fall through */ | |
1831 | default: | |
1832 | err = -ENOTSUPP; | |
1833 | goto done; | |
1834 | } | |
1835 | ||
0797e01d | 1836 | switch (chan->state) { |
03a00194 GP |
1837 | case BT_CONNECT: |
1838 | case BT_CONNECT2: | |
1839 | case BT_CONFIG: | |
1840 | /* Already connecting */ | |
1841 | err = 0; | |
1842 | goto done; | |
1843 | ||
1844 | case BT_CONNECTED: | |
1845 | /* Already connected */ | |
1846 | err = -EISCONN; | |
1847 | goto done; | |
1848 | ||
1849 | case BT_OPEN: | |
1850 | case BT_BOUND: | |
1851 | /* Can connect */ | |
1852 | break; | |
1853 | ||
1854 | default: | |
1855 | err = -EBADFD; | |
1856 | goto done; | |
1857 | } | |
1858 | ||
1859 | /* Set destination address and psm */ | |
7eafc59e | 1860 | bacpy(&chan->dst, dst); |
4f1654e0 | 1861 | chan->dst_type = dst_type; |
6be36555 | 1862 | |
03a00194 GP |
1863 | chan->psm = psm; |
1864 | chan->dcid = cid; | |
1da177e4 | 1865 | |
4343478f | 1866 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1867 | |
f224ca5f | 1868 | if (bdaddr_type_is_le(dst_type)) |
8e9f9892 | 1869 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1870 | chan->sec_level, auth_type); |
acd7d370 | 1871 | else |
8e9f9892 | 1872 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1873 | chan->sec_level, auth_type); |
acd7d370 | 1874 | |
30e76272 VT |
1875 | if (IS_ERR(hcon)) { |
1876 | err = PTR_ERR(hcon); | |
1da177e4 | 1877 | goto done; |
30e76272 | 1878 | } |
1da177e4 | 1879 | |
baf43251 | 1880 | conn = l2cap_conn_add(hcon); |
1da177e4 | 1881 | if (!conn) { |
76a68ba0 | 1882 | hci_conn_drop(hcon); |
30e76272 | 1883 | err = -ENOMEM; |
1da177e4 LT |
1884 | goto done; |
1885 | } | |
1886 | ||
141d5706 JH |
1887 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { |
1888 | hci_conn_drop(hcon); | |
1889 | err = -EBUSY; | |
1890 | goto done; | |
9f0caeb1 VCG |
1891 | } |
1892 | ||
1da177e4 | 1893 | /* Update source addr of the socket */ |
7eafc59e | 1894 | bacpy(&chan->src, &hcon->src); |
4f1654e0 | 1895 | chan->src_type = bdaddr_type(hcon, hcon->src_type); |
1da177e4 | 1896 | |
6be36555 | 1897 | l2cap_chan_unlock(chan); |
48454079 | 1898 | l2cap_chan_add(conn, chan); |
6be36555 | 1899 | l2cap_chan_lock(chan); |
48454079 | 1900 | |
5ee9891d JH |
1901 | /* l2cap_chan_add takes its own ref so we can drop this one */ |
1902 | hci_conn_drop(hcon); | |
1903 | ||
6be36555 | 1904 | l2cap_state_change(chan, BT_CONNECT); |
8d836d71 | 1905 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 LT |
1906 | |
1907 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1908 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1909 | __clear_chan_timer(chan); |
d45fc423 | 1910 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1911 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1912 | } else |
fc7f8a7e | 1913 | l2cap_do_start(chan); |
1da177e4 LT |
1914 | } |
1915 | ||
30e76272 VT |
1916 | err = 0; |
1917 | ||
1da177e4 | 1918 | done: |
6be36555 | 1919 | l2cap_chan_unlock(chan); |
09fd0de5 | 1920 | hci_dev_unlock(hdev); |
1da177e4 LT |
1921 | hci_dev_put(hdev); |
1922 | return err; | |
1923 | } | |
1924 | ||
721c4181 | 1925 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1926 | { |
721c4181 | 1927 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1928 | monitor_timer.work); |
e90bac06 | 1929 | |
525cd185 | 1930 | BT_DBG("chan %p", chan); |
0e98958d | 1931 | |
6be36555 AE |
1932 | l2cap_chan_lock(chan); |
1933 | ||
80909e04 | 1934 | if (!chan->conn) { |
6be36555 | 1935 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1936 | l2cap_chan_put(chan); |
e90bac06 GP |
1937 | return; |
1938 | } | |
1939 | ||
401bb1f7 | 1940 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1941 | |
6be36555 | 1942 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1943 | l2cap_chan_put(chan); |
e90bac06 GP |
1944 | } |
1945 | ||
721c4181 | 1946 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1947 | { |
721c4181 | 1948 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1949 | retrans_timer.work); |
e90bac06 | 1950 | |
49208c9c | 1951 | BT_DBG("chan %p", chan); |
0e98958d | 1952 | |
6be36555 AE |
1953 | l2cap_chan_lock(chan); |
1954 | ||
80909e04 MM |
1955 | if (!chan->conn) { |
1956 | l2cap_chan_unlock(chan); | |
1957 | l2cap_chan_put(chan); | |
1958 | return; | |
1959 | } | |
6be36555 | 1960 | |
401bb1f7 | 1961 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1962 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1963 | l2cap_chan_put(chan); |
e90bac06 GP |
1964 | } |
1965 | ||
d660366d GP |
1966 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1967 | struct sk_buff_head *skbs) | |
6840ed07 | 1968 | { |
ccbb84af | 1969 | struct sk_buff *skb; |
3733937d | 1970 | struct l2cap_ctrl *control; |
6840ed07 | 1971 | |
3733937d MM |
1972 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1973 | ||
b99e13ad MM |
1974 | if (__chan_is_moving(chan)) |
1975 | return; | |
1976 | ||
3733937d MM |
1977 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1978 | ||
1979 | while (!skb_queue_empty(&chan->tx_q)) { | |
1980 | ||
1981 | skb = skb_dequeue(&chan->tx_q); | |
1982 | ||
1983 | bt_cb(skb)->control.retries = 1; | |
1984 | control = &bt_cb(skb)->control; | |
1985 | ||
1986 | control->reqseq = 0; | |
1987 | control->txseq = chan->next_tx_seq; | |
1988 | ||
1989 | __pack_control(chan, control, skb); | |
6840ed07 | 1990 | |
47d1ec61 | 1991 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1992 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1993 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1994 | } |
1995 | ||
4343478f | 1996 | l2cap_do_send(chan, skb); |
6840ed07 | 1997 | |
b4400672 | 1998 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1999 | |
836be934 | 2000 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 2001 | chan->frames_sent++; |
6840ed07 | 2002 | } |
6840ed07 GP |
2003 | } |
2004 | ||
67c9e840 | 2005 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
2006 | { |
2007 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
2008 | struct l2cap_ctrl *control; |
2009 | int sent = 0; | |
2010 | ||
2011 | BT_DBG("chan %p", chan); | |
1c2acffb | 2012 | |
89bc500e | 2013 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 2014 | return -ENOTCONN; |
e90bac06 | 2015 | |
94122bbe MM |
2016 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
2017 | return 0; | |
2018 | ||
b99e13ad MM |
2019 | if (__chan_is_moving(chan)) |
2020 | return 0; | |
2021 | ||
18a48e76 MM |
2022 | while (chan->tx_send_head && |
2023 | chan->unacked_frames < chan->remote_tx_win && | |
2024 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 2025 | |
18a48e76 | 2026 | skb = chan->tx_send_head; |
e90bac06 | 2027 | |
18a48e76 MM |
2028 | bt_cb(skb)->control.retries = 1; |
2029 | control = &bt_cb(skb)->control; | |
95ffa978 | 2030 | |
e2ab4353 | 2031 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 2032 | control->final = 1; |
e2ab4353 | 2033 | |
18a48e76 MM |
2034 | control->reqseq = chan->buffer_seq; |
2035 | chan->last_acked_seq = chan->buffer_seq; | |
2036 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 2037 | |
18a48e76 | 2038 | __pack_control(chan, control, skb); |
e90bac06 | 2039 | |
47d1ec61 | 2040 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
2041 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
2042 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
2043 | } |
2044 | ||
18a48e76 MM |
2045 | /* Clone after data has been modified. Data is assumed to be |
2046 | read-only (for locking purposes) on cloned sk_buffs. | |
2047 | */ | |
2048 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 2049 | |
18a48e76 MM |
2050 | if (!tx_skb) |
2051 | break; | |
1c2acffb | 2052 | |
18a48e76 | 2053 | __set_retrans_timer(chan); |
836be934 AE |
2054 | |
2055 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 2056 | chan->unacked_frames++; |
6a026610 | 2057 | chan->frames_sent++; |
18a48e76 | 2058 | sent++; |
1c2acffb | 2059 | |
58d35f87 GP |
2060 | if (skb_queue_is_last(&chan->tx_q, skb)) |
2061 | chan->tx_send_head = NULL; | |
1c2acffb | 2062 | else |
58d35f87 | 2063 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
2064 | |
2065 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 2066 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
2067 | } |
2068 | ||
b4400672 AE |
2069 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
2070 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
2071 | |
2072 | return sent; | |
9e917af1 GP |
2073 | } |
2074 | ||
e1fbd4c1 MM |
2075 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
2076 | { | |
2077 | struct l2cap_ctrl control; | |
2078 | struct sk_buff *skb; | |
2079 | struct sk_buff *tx_skb; | |
2080 | u16 seq; | |
2081 | ||
2082 | BT_DBG("chan %p", chan); | |
2083 | ||
2084 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2085 | return; | |
2086 | ||
b99e13ad MM |
2087 | if (__chan_is_moving(chan)) |
2088 | return; | |
2089 | ||
e1fbd4c1 MM |
2090 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
2091 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
2092 | ||
2093 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
2094 | if (!skb) { | |
2095 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 2096 | seq); |
e1fbd4c1 MM |
2097 | continue; |
2098 | } | |
2099 | ||
2100 | bt_cb(skb)->control.retries++; | |
2101 | control = bt_cb(skb)->control; | |
2102 | ||
2103 | if (chan->max_tx != 0 && | |
2104 | bt_cb(skb)->control.retries > chan->max_tx) { | |
2105 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 2106 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
2107 | l2cap_seq_list_clear(&chan->retrans_list); |
2108 | break; | |
2109 | } | |
2110 | ||
2111 | control.reqseq = chan->buffer_seq; | |
2112 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
2113 | control.final = 1; | |
2114 | else | |
2115 | control.final = 0; | |
2116 | ||
2117 | if (skb_cloned(skb)) { | |
2118 | /* Cloned sk_buffs are read-only, so we need a | |
2119 | * writeable copy | |
2120 | */ | |
8bcde1f2 | 2121 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 2122 | } else { |
8bcde1f2 | 2123 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
2124 | } |
2125 | ||
2126 | if (!tx_skb) { | |
2127 | l2cap_seq_list_clear(&chan->retrans_list); | |
2128 | break; | |
2129 | } | |
2130 | ||
2131 | /* Update skb contents */ | |
2132 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
2133 | put_unaligned_le32(__pack_extended_control(&control), | |
2134 | tx_skb->data + L2CAP_HDR_SIZE); | |
2135 | } else { | |
2136 | put_unaligned_le16(__pack_enhanced_control(&control), | |
2137 | tx_skb->data + L2CAP_HDR_SIZE); | |
2138 | } | |
2139 | ||
2140 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
2141 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
2142 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
2143 | L2CAP_FCS_SIZE)); | |
2144 | } | |
2145 | ||
2146 | l2cap_do_send(chan, tx_skb); | |
2147 | ||
2148 | BT_DBG("Resent txseq %d", control.txseq); | |
2149 | ||
2150 | chan->last_acked_seq = chan->buffer_seq; | |
2151 | } | |
2152 | } | |
2153 | ||
f80842a8 MM |
2154 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2155 | struct l2cap_ctrl *control) | |
2156 | { | |
2157 | BT_DBG("chan %p, control %p", chan, control); | |
2158 | ||
2159 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2160 | l2cap_ertm_resend(chan); | |
2161 | } | |
2162 | ||
d2a7ac5d MM |
2163 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2164 | struct l2cap_ctrl *control) | |
2165 | { | |
e1fbd4c1 MM |
2166 | struct sk_buff *skb; |
2167 | ||
2168 | BT_DBG("chan %p, control %p", chan, control); | |
2169 | ||
2170 | if (control->poll) | |
2171 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2172 | ||
2173 | l2cap_seq_list_clear(&chan->retrans_list); | |
2174 | ||
2175 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2176 | return; | |
2177 | ||
2178 | if (chan->unacked_frames) { | |
2179 | skb_queue_walk(&chan->tx_q, skb) { | |
2180 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2181 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2182 | break; |
2183 | } | |
2184 | ||
2185 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2186 | if (skb == chan->tx_send_head) | |
2187 | break; | |
2188 | ||
2189 | l2cap_seq_list_append(&chan->retrans_list, | |
2190 | bt_cb(skb)->control.txseq); | |
2191 | } | |
2192 | ||
2193 | l2cap_ertm_resend(chan); | |
2194 | } | |
d2a7ac5d MM |
2195 | } |
2196 | ||
0a0aba42 | 2197 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2198 | { |
0a0aba42 MM |
2199 | struct l2cap_ctrl control; |
2200 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2201 | chan->last_acked_seq); | |
2202 | int threshold; | |
9e917af1 | 2203 | |
0a0aba42 MM |
2204 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2205 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2206 | |
0a0aba42 MM |
2207 | memset(&control, 0, sizeof(control)); |
2208 | control.sframe = 1; | |
dfc909be | 2209 | |
0a0aba42 MM |
2210 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2211 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2212 | __clear_ack_timer(chan); | |
2213 | control.super = L2CAP_SUPER_RNR; | |
2214 | control.reqseq = chan->buffer_seq; | |
2215 | l2cap_send_sframe(chan, &control); | |
2216 | } else { | |
2217 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2218 | l2cap_ertm_send(chan); | |
2219 | /* If any i-frames were sent, they included an ack */ | |
2220 | if (chan->buffer_seq == chan->last_acked_seq) | |
2221 | frames_to_ack = 0; | |
2222 | } | |
dfc909be | 2223 | |
c20f8e35 | 2224 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2225 | * Calculate without mul or div |
2226 | */ | |
c20f8e35 | 2227 | threshold = chan->ack_win; |
0a0aba42 MM |
2228 | threshold += threshold << 1; |
2229 | threshold >>= 2; | |
2230 | ||
b4400672 | 2231 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2232 | threshold); |
2233 | ||
2234 | if (frames_to_ack >= threshold) { | |
2235 | __clear_ack_timer(chan); | |
2236 | control.super = L2CAP_SUPER_RR; | |
2237 | control.reqseq = chan->buffer_seq; | |
2238 | l2cap_send_sframe(chan, &control); | |
2239 | frames_to_ack = 0; | |
2240 | } | |
1c2acffb | 2241 | |
0a0aba42 MM |
2242 | if (frames_to_ack) |
2243 | __set_ack_timer(chan); | |
2244 | } | |
b17e73bb SJ |
2245 | } |
2246 | ||
04124681 GP |
2247 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2248 | struct msghdr *msg, int len, | |
2249 | int count, struct sk_buff *skb) | |
1c2acffb | 2250 | { |
0952a57a | 2251 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2252 | struct sk_buff **frag; |
90338947 | 2253 | int sent = 0; |
1da177e4 | 2254 | |
59203a21 | 2255 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 2256 | return -EFAULT; |
1da177e4 LT |
2257 | |
2258 | sent += count; | |
2259 | len -= count; | |
2260 | ||
2261 | /* Continuation fragments (no L2CAP header) */ | |
2262 | frag = &skb_shinfo(skb)->frag_list; | |
2263 | while (len) { | |
fbe00700 GP |
2264 | struct sk_buff *tmp; |
2265 | ||
1da177e4 LT |
2266 | count = min_t(unsigned int, conn->mtu, len); |
2267 | ||
fbe00700 GP |
2268 | tmp = chan->ops->alloc_skb(chan, count, |
2269 | msg->msg_flags & MSG_DONTWAIT); | |
2270 | if (IS_ERR(tmp)) | |
2271 | return PTR_ERR(tmp); | |
2272 | ||
2273 | *frag = tmp; | |
2f7719ce | 2274 | |
1c2acffb GP |
2275 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
2276 | return -EFAULT; | |
1da177e4 | 2277 | |
5e59b791 LAD |
2278 | (*frag)->priority = skb->priority; |
2279 | ||
1da177e4 LT |
2280 | sent += count; |
2281 | len -= count; | |
2282 | ||
2d0ed3d5 GP |
2283 | skb->len += (*frag)->len; |
2284 | skb->data_len += (*frag)->len; | |
2285 | ||
1da177e4 LT |
2286 | frag = &(*frag)->next; |
2287 | } | |
1da177e4 LT |
2288 | |
2289 | return sent; | |
1c2acffb | 2290 | } |
1da177e4 | 2291 | |
5e59b791 | 2292 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2293 | struct msghdr *msg, size_t len, |
2294 | u32 priority) | |
1c2acffb | 2295 | { |
8c1d787b | 2296 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2297 | struct sk_buff *skb; |
03a51213 | 2298 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2299 | struct l2cap_hdr *lh; |
2300 | ||
43b1b8df MH |
2301 | BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan, |
2302 | __le16_to_cpu(chan->psm), len, priority); | |
1c2acffb GP |
2303 | |
2304 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2305 | |
2306 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2307 | msg->msg_flags & MSG_DONTWAIT); |
2308 | if (IS_ERR(skb)) | |
2309 | return skb; | |
1c2acffb | 2310 | |
5e59b791 LAD |
2311 | skb->priority = priority; |
2312 | ||
1c2acffb GP |
2313 | /* Create L2CAP header */ |
2314 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2315 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2316 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2317 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2318 | |
0952a57a | 2319 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2320 | if (unlikely(err < 0)) { |
2321 | kfree_skb(skb); | |
2322 | return ERR_PTR(err); | |
2323 | } | |
2324 | return skb; | |
2325 | } | |
2326 | ||
5e59b791 | 2327 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2328 | struct msghdr *msg, size_t len, |
2329 | u32 priority) | |
1c2acffb | 2330 | { |
8c1d787b | 2331 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2332 | struct sk_buff *skb; |
f2ba7fae | 2333 | int err, count; |
1c2acffb GP |
2334 | struct l2cap_hdr *lh; |
2335 | ||
b4400672 | 2336 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2337 | |
f2ba7fae | 2338 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2339 | |
f2ba7fae | 2340 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2341 | msg->msg_flags & MSG_DONTWAIT); |
2342 | if (IS_ERR(skb)) | |
2343 | return skb; | |
1c2acffb | 2344 | |
5e59b791 LAD |
2345 | skb->priority = priority; |
2346 | ||
1c2acffb GP |
2347 | /* Create L2CAP header */ |
2348 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2349 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2350 | lh->len = cpu_to_le16(len); |
1c2acffb | 2351 | |
0952a57a | 2352 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2353 | if (unlikely(err < 0)) { |
2354 | kfree_skb(skb); | |
2355 | return ERR_PTR(err); | |
2356 | } | |
2357 | return skb; | |
2358 | } | |
2359 | ||
ab0ff76d | 2360 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2361 | struct msghdr *msg, size_t len, |
2362 | u16 sdulen) | |
1c2acffb | 2363 | { |
8c1d787b | 2364 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2365 | struct sk_buff *skb; |
e4ca6d98 | 2366 | int err, count, hlen; |
1c2acffb GP |
2367 | struct l2cap_hdr *lh; |
2368 | ||
b4400672 | 2369 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2370 | |
0ee0d208 GP |
2371 | if (!conn) |
2372 | return ERR_PTR(-ENOTCONN); | |
2373 | ||
ba7aa64f | 2374 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2375 | |
c74e560c | 2376 | if (sdulen) |
03a51213 | 2377 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2378 | |
47d1ec61 | 2379 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2380 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2381 | |
1c2acffb | 2382 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2383 | |
2384 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2385 | msg->msg_flags & MSG_DONTWAIT); |
2386 | if (IS_ERR(skb)) | |
2387 | return skb; | |
1c2acffb GP |
2388 | |
2389 | /* Create L2CAP header */ | |
2390 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2391 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2392 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2393 | |
18a48e76 MM |
2394 | /* Control header is populated later */ |
2395 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2396 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2397 | else | |
2398 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2399 | |
c74e560c | 2400 | if (sdulen) |
03a51213 | 2401 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2402 | |
0952a57a | 2403 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2404 | if (unlikely(err < 0)) { |
2405 | kfree_skb(skb); | |
2406 | return ERR_PTR(err); | |
2407 | } | |
e90bac06 | 2408 | |
18a48e76 | 2409 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2410 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2411 | return skb; |
1da177e4 LT |
2412 | } |
2413 | ||
94122bbe MM |
2414 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2415 | struct sk_buff_head *seg_queue, | |
2416 | struct msghdr *msg, size_t len) | |
c74e560c | 2417 | { |
c74e560c | 2418 | struct sk_buff *skb; |
94122bbe MM |
2419 | u16 sdu_len; |
2420 | size_t pdu_len; | |
94122bbe | 2421 | u8 sar; |
c74e560c | 2422 | |
b4400672 | 2423 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2424 | |
94122bbe MM |
2425 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2426 | * so fragmented skbs are not used. The HCI layer's handling | |
2427 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2428 | */ | |
c74e560c | 2429 | |
94122bbe MM |
2430 | /* PDU size is derived from the HCI MTU */ |
2431 | pdu_len = chan->conn->mtu; | |
c74e560c | 2432 | |
a549574d MM |
2433 | /* Constrain PDU size for BR/EDR connections */ |
2434 | if (!chan->hs_hcon) | |
2435 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2436 | |
2437 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2438 | if (chan->fcs) |
2439 | pdu_len -= L2CAP_FCS_SIZE; | |
2440 | ||
ba7aa64f | 2441 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2442 | |
2443 | /* Remote device may have requested smaller PDUs */ | |
2444 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2445 | ||
2446 | if (len <= pdu_len) { | |
2447 | sar = L2CAP_SAR_UNSEGMENTED; | |
2448 | sdu_len = 0; | |
2449 | pdu_len = len; | |
2450 | } else { | |
2451 | sar = L2CAP_SAR_START; | |
2452 | sdu_len = len; | |
2453 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2454 | } | |
2455 | ||
2456 | while (len > 0) { | |
2457 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2458 | |
c74e560c | 2459 | if (IS_ERR(skb)) { |
94122bbe | 2460 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2461 | return PTR_ERR(skb); |
2462 | } | |
2463 | ||
94122bbe MM |
2464 | bt_cb(skb)->control.sar = sar; |
2465 | __skb_queue_tail(seg_queue, skb); | |
2466 | ||
2467 | len -= pdu_len; | |
2468 | if (sdu_len) { | |
2469 | sdu_len = 0; | |
2470 | pdu_len += L2CAP_SDULEN_SIZE; | |
2471 | } | |
2472 | ||
2473 | if (len <= pdu_len) { | |
2474 | sar = L2CAP_SAR_END; | |
2475 | pdu_len = len; | |
2476 | } else { | |
2477 | sar = L2CAP_SAR_CONTINUE; | |
2478 | } | |
c74e560c | 2479 | } |
c74e560c | 2480 | |
f0f62799 | 2481 | return 0; |
c74e560c GP |
2482 | } |
2483 | ||
5e59b791 | 2484 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2485 | u32 priority) |
9a91a04a | 2486 | { |
9a91a04a | 2487 | struct sk_buff *skb; |
9a91a04a | 2488 | int err; |
94122bbe | 2489 | struct sk_buff_head seg_queue; |
9a91a04a | 2490 | |
31e8ce80 SWK |
2491 | if (!chan->conn) |
2492 | return -ENOTCONN; | |
2493 | ||
9a91a04a | 2494 | /* Connectionless channel */ |
715ec005 | 2495 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2496 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2497 | if (IS_ERR(skb)) |
2498 | return PTR_ERR(skb); | |
2499 | ||
2500 | l2cap_do_send(chan, skb); | |
2501 | return len; | |
2502 | } | |
2503 | ||
2504 | switch (chan->mode) { | |
2505 | case L2CAP_MODE_BASIC: | |
2506 | /* Check outgoing MTU */ | |
2507 | if (len > chan->omtu) | |
2508 | return -EMSGSIZE; | |
2509 | ||
2510 | /* Create a basic PDU */ | |
5e59b791 | 2511 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2512 | if (IS_ERR(skb)) |
2513 | return PTR_ERR(skb); | |
2514 | ||
2515 | l2cap_do_send(chan, skb); | |
2516 | err = len; | |
2517 | break; | |
2518 | ||
2519 | case L2CAP_MODE_ERTM: | |
2520 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2521 | /* Check outgoing MTU */ |
2522 | if (len > chan->omtu) { | |
2523 | err = -EMSGSIZE; | |
2524 | break; | |
2525 | } | |
9a91a04a | 2526 | |
94122bbe | 2527 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2528 | |
94122bbe MM |
2529 | /* Do segmentation before calling in to the state machine, |
2530 | * since it's possible to block while waiting for memory | |
2531 | * allocation. | |
2532 | */ | |
2533 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2534 | |
94122bbe MM |
2535 | /* The channel could have been closed while segmenting, |
2536 | * check that it is still connected. | |
2537 | */ | |
2538 | if (chan->state != BT_CONNECTED) { | |
2539 | __skb_queue_purge(&seg_queue); | |
2540 | err = -ENOTCONN; | |
9a91a04a GP |
2541 | } |
2542 | ||
94122bbe | 2543 | if (err) |
9a91a04a | 2544 | break; |
9a91a04a | 2545 | |
3733937d | 2546 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2547 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2548 | else |
d660366d | 2549 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2550 | |
d660366d | 2551 | err = len; |
9a91a04a | 2552 | |
94122bbe MM |
2553 | /* If the skbs were not queued for sending, they'll still be in |
2554 | * seg_queue and need to be purged. | |
2555 | */ | |
2556 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2557 | break; |
2558 | ||
2559 | default: | |
2560 | BT_DBG("bad state %1.1x", chan->mode); | |
2561 | err = -EBADFD; | |
2562 | } | |
2563 | ||
2564 | return err; | |
2565 | } | |
2566 | ||
d2a7ac5d MM |
2567 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2568 | { | |
bed68bde MM |
2569 | struct l2cap_ctrl control; |
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 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2579 | seq = __next_seq(chan, seq)) { | |
2580 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2581 | control.reqseq = seq; | |
2582 | l2cap_send_sframe(chan, &control); | |
2583 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2584 | } | |
2585 | } | |
2586 | ||
2587 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2588 | } |
2589 | ||
2590 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2591 | { | |
bed68bde MM |
2592 | struct l2cap_ctrl control; |
2593 | ||
2594 | BT_DBG("chan %p", chan); | |
2595 | ||
2596 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2597 | return; | |
2598 | ||
2599 | memset(&control, 0, sizeof(control)); | |
2600 | control.sframe = 1; | |
2601 | control.super = L2CAP_SUPER_SREJ; | |
2602 | control.reqseq = chan->srej_list.tail; | |
2603 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2604 | } |
2605 | ||
2606 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2607 | { | |
bed68bde MM |
2608 | struct l2cap_ctrl control; |
2609 | u16 initial_head; | |
2610 | u16 seq; | |
2611 | ||
b4400672 | 2612 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2613 | |
2614 | memset(&control, 0, sizeof(control)); | |
2615 | control.sframe = 1; | |
2616 | control.super = L2CAP_SUPER_SREJ; | |
2617 | ||
2618 | /* Capture initial list head to allow only one pass through the list. */ | |
2619 | initial_head = chan->srej_list.head; | |
2620 | ||
2621 | do { | |
2622 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2623 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2624 | break; | |
2625 | ||
2626 | control.reqseq = seq; | |
2627 | l2cap_send_sframe(chan, &control); | |
2628 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2629 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2630 | } |
2631 | ||
608bcc6d MM |
2632 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2633 | { | |
2634 | struct sk_buff *acked_skb; | |
2635 | u16 ackseq; | |
2636 | ||
b4400672 | 2637 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2638 | |
2639 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2640 | return; | |
2641 | ||
b4400672 | 2642 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2643 | chan->expected_ack_seq, chan->unacked_frames); |
2644 | ||
2645 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2646 | ackseq = __next_seq(chan, ackseq)) { | |
2647 | ||
2648 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2649 | if (acked_skb) { | |
2650 | skb_unlink(acked_skb, &chan->tx_q); | |
2651 | kfree_skb(acked_skb); | |
2652 | chan->unacked_frames--; | |
2653 | } | |
2654 | } | |
2655 | ||
2656 | chan->expected_ack_seq = reqseq; | |
2657 | ||
2658 | if (chan->unacked_frames == 0) | |
2659 | __clear_retrans_timer(chan); | |
2660 | ||
b4400672 | 2661 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2662 | } |
2663 | ||
2664 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2665 | { | |
2666 | BT_DBG("chan %p", chan); | |
2667 | ||
2668 | chan->expected_tx_seq = chan->buffer_seq; | |
2669 | l2cap_seq_list_clear(&chan->srej_list); | |
2670 | skb_queue_purge(&chan->srej_q); | |
2671 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2672 | } | |
2673 | ||
d660366d GP |
2674 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2675 | struct l2cap_ctrl *control, | |
2676 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2677 | { |
608bcc6d MM |
2678 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2679 | event); | |
2680 | ||
2681 | switch (event) { | |
2682 | case L2CAP_EV_DATA_REQUEST: | |
2683 | if (chan->tx_send_head == NULL) | |
2684 | chan->tx_send_head = skb_peek(skbs); | |
2685 | ||
2686 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2687 | l2cap_ertm_send(chan); | |
2688 | break; | |
2689 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2690 | BT_DBG("Enter LOCAL_BUSY"); | |
2691 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2692 | ||
2693 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2694 | /* The SREJ_SENT state must be aborted if we are to | |
2695 | * enter the LOCAL_BUSY state. | |
2696 | */ | |
2697 | l2cap_abort_rx_srej_sent(chan); | |
2698 | } | |
2699 | ||
2700 | l2cap_send_ack(chan); | |
2701 | ||
2702 | break; | |
2703 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2704 | BT_DBG("Exit LOCAL_BUSY"); | |
2705 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2706 | ||
2707 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2708 | struct l2cap_ctrl local_control; | |
2709 | ||
2710 | memset(&local_control, 0, sizeof(local_control)); | |
2711 | local_control.sframe = 1; | |
2712 | local_control.super = L2CAP_SUPER_RR; | |
2713 | local_control.poll = 1; | |
2714 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2715 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2716 | |
2717 | chan->retry_count = 1; | |
2718 | __set_monitor_timer(chan); | |
2719 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2720 | } | |
2721 | break; | |
2722 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2723 | l2cap_process_reqseq(chan, control->reqseq); | |
2724 | break; | |
2725 | case L2CAP_EV_EXPLICIT_POLL: | |
2726 | l2cap_send_rr_or_rnr(chan, 1); | |
2727 | chan->retry_count = 1; | |
2728 | __set_monitor_timer(chan); | |
2729 | __clear_ack_timer(chan); | |
2730 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2731 | break; | |
2732 | case L2CAP_EV_RETRANS_TO: | |
2733 | l2cap_send_rr_or_rnr(chan, 1); | |
2734 | chan->retry_count = 1; | |
2735 | __set_monitor_timer(chan); | |
2736 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2737 | break; | |
2738 | case L2CAP_EV_RECV_FBIT: | |
2739 | /* Nothing to process */ | |
2740 | break; | |
2741 | default: | |
2742 | break; | |
2743 | } | |
608bcc6d MM |
2744 | } |
2745 | ||
d660366d GP |
2746 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2747 | struct l2cap_ctrl *control, | |
2748 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2749 | { |
608bcc6d MM |
2750 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2751 | event); | |
2752 | ||
2753 | switch (event) { | |
2754 | case L2CAP_EV_DATA_REQUEST: | |
2755 | if (chan->tx_send_head == NULL) | |
2756 | chan->tx_send_head = skb_peek(skbs); | |
2757 | /* Queue data, but don't send. */ | |
2758 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2759 | break; | |
2760 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2761 | BT_DBG("Enter LOCAL_BUSY"); | |
2762 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2763 | ||
2764 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2765 | /* The SREJ_SENT state must be aborted if we are to | |
2766 | * enter the LOCAL_BUSY state. | |
2767 | */ | |
2768 | l2cap_abort_rx_srej_sent(chan); | |
2769 | } | |
2770 | ||
2771 | l2cap_send_ack(chan); | |
2772 | ||
2773 | break; | |
2774 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2775 | BT_DBG("Exit LOCAL_BUSY"); | |
2776 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2777 | ||
2778 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2779 | struct l2cap_ctrl local_control; | |
2780 | memset(&local_control, 0, sizeof(local_control)); | |
2781 | local_control.sframe = 1; | |
2782 | local_control.super = L2CAP_SUPER_RR; | |
2783 | local_control.poll = 1; | |
2784 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2785 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2786 | |
2787 | chan->retry_count = 1; | |
2788 | __set_monitor_timer(chan); | |
2789 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2790 | } | |
2791 | break; | |
2792 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2793 | l2cap_process_reqseq(chan, control->reqseq); | |
2794 | ||
2795 | /* Fall through */ | |
2796 | ||
2797 | case L2CAP_EV_RECV_FBIT: | |
2798 | if (control && control->final) { | |
2799 | __clear_monitor_timer(chan); | |
2800 | if (chan->unacked_frames > 0) | |
2801 | __set_retrans_timer(chan); | |
2802 | chan->retry_count = 0; | |
2803 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2804 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2805 | } | |
2806 | break; | |
2807 | case L2CAP_EV_EXPLICIT_POLL: | |
2808 | /* Ignore */ | |
2809 | break; | |
2810 | case L2CAP_EV_MONITOR_TO: | |
2811 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2812 | l2cap_send_rr_or_rnr(chan, 1); | |
2813 | __set_monitor_timer(chan); | |
2814 | chan->retry_count++; | |
2815 | } else { | |
5e4e3972 | 2816 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2817 | } |
2818 | break; | |
2819 | default: | |
2820 | break; | |
2821 | } | |
608bcc6d MM |
2822 | } |
2823 | ||
d660366d GP |
2824 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2825 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2826 | { |
608bcc6d MM |
2827 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2828 | chan, control, skbs, event, chan->tx_state); | |
2829 | ||
2830 | switch (chan->tx_state) { | |
2831 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2832 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2833 | break; |
2834 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2835 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2836 | break; |
2837 | default: | |
2838 | /* Ignore event */ | |
2839 | break; | |
2840 | } | |
608bcc6d MM |
2841 | } |
2842 | ||
4b51dae9 MM |
2843 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2844 | struct l2cap_ctrl *control) | |
2845 | { | |
2846 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2847 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2848 | } |
2849 | ||
f80842a8 MM |
2850 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2851 | struct l2cap_ctrl *control) | |
2852 | { | |
2853 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2854 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2855 | } |
2856 | ||
1da177e4 LT |
2857 | /* Copy frame to all raw sockets on that connection */ |
2858 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2859 | { | |
1da177e4 | 2860 | struct sk_buff *nskb; |
48454079 | 2861 | struct l2cap_chan *chan; |
1da177e4 LT |
2862 | |
2863 | BT_DBG("conn %p", conn); | |
2864 | ||
3df91ea2 | 2865 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2866 | |
3df91ea2 | 2867 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2868 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2869 | continue; |
2870 | ||
7f5396a7 GP |
2871 | /* Don't send frame to the channel it came from */ |
2872 | if (bt_cb(skb)->chan == chan) | |
1da177e4 | 2873 | continue; |
7f5396a7 | 2874 | |
8bcde1f2 | 2875 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2876 | if (!nskb) |
1da177e4 | 2877 | continue; |
80b98027 | 2878 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2879 | kfree_skb(nskb); |
2880 | } | |
3d57dc68 | 2881 | |
3df91ea2 | 2882 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2883 | } |
2884 | ||
2885 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2886 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2887 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2888 | { |
2889 | struct sk_buff *skb, **frag; | |
2890 | struct l2cap_cmd_hdr *cmd; | |
2891 | struct l2cap_hdr *lh; | |
2892 | int len, count; | |
2893 | ||
b4400672 AE |
2894 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2895 | conn, code, ident, dlen); | |
1da177e4 | 2896 | |
300b962e AL |
2897 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2898 | return NULL; | |
2899 | ||
1da177e4 LT |
2900 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2901 | count = min_t(unsigned int, conn->mtu, len); | |
2902 | ||
8bcde1f2 | 2903 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2904 | if (!skb) |
2905 | return NULL; | |
2906 | ||
2907 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2908 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2909 | |
2910 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2911 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2912 | else |
ac73498c | 2913 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2914 | |
2915 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2916 | cmd->code = code; | |
2917 | cmd->ident = ident; | |
aca3192c | 2918 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2919 | |
2920 | if (dlen) { | |
2921 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2922 | memcpy(skb_put(skb, count), data, count); | |
2923 | data += count; | |
2924 | } | |
2925 | ||
2926 | len -= skb->len; | |
2927 | ||
2928 | /* Continuation fragments (no L2CAP header) */ | |
2929 | frag = &skb_shinfo(skb)->frag_list; | |
2930 | while (len) { | |
2931 | count = min_t(unsigned int, conn->mtu, len); | |
2932 | ||
8bcde1f2 | 2933 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2934 | if (!*frag) |
2935 | goto fail; | |
2936 | ||
2937 | memcpy(skb_put(*frag, count), data, count); | |
2938 | ||
2939 | len -= count; | |
2940 | data += count; | |
2941 | ||
2942 | frag = &(*frag)->next; | |
2943 | } | |
2944 | ||
2945 | return skb; | |
2946 | ||
2947 | fail: | |
2948 | kfree_skb(skb); | |
2949 | return NULL; | |
2950 | } | |
2951 | ||
2d792818 GP |
2952 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2953 | unsigned long *val) | |
1da177e4 LT |
2954 | { |
2955 | struct l2cap_conf_opt *opt = *ptr; | |
2956 | int len; | |
2957 | ||
2958 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2959 | *ptr += len; | |
2960 | ||
2961 | *type = opt->type; | |
2962 | *olen = opt->len; | |
2963 | ||
2964 | switch (opt->len) { | |
2965 | case 1: | |
2966 | *val = *((u8 *) opt->val); | |
2967 | break; | |
2968 | ||
2969 | case 2: | |
bfaaeb3e | 2970 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2971 | break; |
2972 | ||
2973 | case 4: | |
bfaaeb3e | 2974 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2975 | break; |
2976 | ||
2977 | default: | |
2978 | *val = (unsigned long) opt->val; | |
2979 | break; | |
2980 | } | |
2981 | ||
b4400672 | 2982 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2983 | return len; |
2984 | } | |
2985 | ||
1da177e4 LT |
2986 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2987 | { | |
2988 | struct l2cap_conf_opt *opt = *ptr; | |
2989 | ||
b4400672 | 2990 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2991 | |
2992 | opt->type = type; | |
2993 | opt->len = len; | |
2994 | ||
2995 | switch (len) { | |
2996 | case 1: | |
2997 | *((u8 *) opt->val) = val; | |
2998 | break; | |
2999 | ||
3000 | case 2: | |
4f8b691c | 3001 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
3002 | break; |
3003 | ||
3004 | case 4: | |
4f8b691c | 3005 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
3006 | break; |
3007 | ||
3008 | default: | |
3009 | memcpy(opt->val, (void *) val, len); | |
3010 | break; | |
3011 | } | |
3012 | ||
3013 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
3014 | } | |
3015 | ||
f89cef09 AE |
3016 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
3017 | { | |
3018 | struct l2cap_conf_efs efs; | |
3019 | ||
1ec918ce | 3020 | switch (chan->mode) { |
f89cef09 AE |
3021 | case L2CAP_MODE_ERTM: |
3022 | efs.id = chan->local_id; | |
3023 | efs.stype = chan->local_stype; | |
3024 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3025 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 3026 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 3027 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
3028 | break; |
3029 | ||
3030 | case L2CAP_MODE_STREAMING: | |
3031 | efs.id = 1; | |
3032 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
3033 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3034 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
3035 | efs.acc_lat = 0; | |
3036 | efs.flush_to = 0; | |
3037 | break; | |
3038 | ||
3039 | default: | |
3040 | return; | |
3041 | } | |
3042 | ||
3043 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 3044 | (unsigned long) &efs); |
f89cef09 AE |
3045 | } |
3046 | ||
721c4181 | 3047 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3048 | { |
721c4181 | 3049 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3050 | ack_timer.work); |
3051 | u16 frames_to_ack; | |
c1b4f43b | 3052 | |
2fb9b3d4 GP |
3053 | BT_DBG("chan %p", chan); |
3054 | ||
6be36555 AE |
3055 | l2cap_chan_lock(chan); |
3056 | ||
0362520b MM |
3057 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3058 | chan->last_acked_seq); | |
6be36555 | 3059 | |
0362520b MM |
3060 | if (frames_to_ack) |
3061 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3062 | |
0362520b | 3063 | l2cap_chan_unlock(chan); |
09bfb2ee | 3064 | l2cap_chan_put(chan); |
c1b4f43b GP |
3065 | } |
3066 | ||
466f8004 | 3067 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3068 | { |
3c588192 MM |
3069 | int err; |
3070 | ||
105bdf9e MM |
3071 | chan->next_tx_seq = 0; |
3072 | chan->expected_tx_seq = 0; | |
42e5c802 | 3073 | chan->expected_ack_seq = 0; |
6a026610 | 3074 | chan->unacked_frames = 0; |
42e5c802 | 3075 | chan->buffer_seq = 0; |
6a026610 | 3076 | chan->frames_sent = 0; |
105bdf9e MM |
3077 | chan->last_acked_seq = 0; |
3078 | chan->sdu = NULL; | |
3079 | chan->sdu_last_frag = NULL; | |
3080 | chan->sdu_len = 0; | |
3081 | ||
d34c34fb MM |
3082 | skb_queue_head_init(&chan->tx_q); |
3083 | ||
6ed971ca MH |
3084 | chan->local_amp_id = AMP_ID_BREDR; |
3085 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3086 | chan->move_state = L2CAP_MOVE_STABLE; |
3087 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3088 | ||
105bdf9e MM |
3089 | if (chan->mode != L2CAP_MODE_ERTM) |
3090 | return 0; | |
3091 | ||
3092 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3093 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3094 | |
721c4181 GP |
3095 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3096 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3097 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3098 | |
f1c6775b | 3099 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3100 | |
3c588192 MM |
3101 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3102 | if (err < 0) | |
3103 | return err; | |
3104 | ||
9dc9affc MM |
3105 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3106 | if (err < 0) | |
3107 | l2cap_seq_list_free(&chan->srej_list); | |
3108 | ||
3109 | return err; | |
0565c1c2 GP |
3110 | } |
3111 | ||
f2fcfcd6 GP |
3112 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3113 | { | |
3114 | switch (mode) { | |
3115 | case L2CAP_MODE_STREAMING: | |
3116 | case L2CAP_MODE_ERTM: | |
3117 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3118 | return mode; | |
3119 | /* fall through */ | |
3120 | default: | |
3121 | return L2CAP_MODE_BASIC; | |
3122 | } | |
3123 | } | |
3124 | ||
848566b3 | 3125 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3126 | { |
848566b3 | 3127 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; |
6327eb98 AE |
3128 | } |
3129 | ||
848566b3 | 3130 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3131 | { |
848566b3 | 3132 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; |
f89cef09 AE |
3133 | } |
3134 | ||
36c86c85 MM |
3135 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3136 | struct l2cap_conf_rfc *rfc) | |
3137 | { | |
6ed971ca | 3138 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3139 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3140 | ||
3141 | /* Class 1 devices have must have ERTM timeouts | |
3142 | * exceeding the Link Supervision Timeout. The | |
3143 | * default Link Supervision Timeout for AMP | |
3144 | * controllers is 10 seconds. | |
3145 | * | |
3146 | * Class 1 devices use 0xffffffff for their | |
3147 | * best-effort flush timeout, so the clamping logic | |
3148 | * will result in a timeout that meets the above | |
3149 | * requirement. ERTM timeouts are 16-bit values, so | |
3150 | * the maximum timeout is 65.535 seconds. | |
3151 | */ | |
3152 | ||
3153 | /* Convert timeout to milliseconds and round */ | |
3154 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3155 | ||
3156 | /* This is the recommended formula for class 2 devices | |
3157 | * that start ERTM timers when packets are sent to the | |
3158 | * controller. | |
3159 | */ | |
3160 | ertm_to = 3 * ertm_to + 500; | |
3161 | ||
3162 | if (ertm_to > 0xffff) | |
3163 | ertm_to = 0xffff; | |
3164 | ||
3165 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3166 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3167 | } else { | |
3168 | rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
3169 | rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
3170 | } | |
3171 | } | |
3172 | ||
6327eb98 AE |
3173 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3174 | { | |
3175 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3176 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3177 | /* use extended control field */ |
3178 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3179 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3180 | } else { | |
6327eb98 | 3181 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3182 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3183 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3184 | } | |
c20f8e35 | 3185 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3186 | } |
3187 | ||
710f9b0a | 3188 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3189 | { |
1da177e4 | 3190 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3191 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3192 | void *ptr = req->data; |
c8f79162 | 3193 | u16 size; |
1da177e4 | 3194 | |
49208c9c | 3195 | BT_DBG("chan %p", chan); |
1da177e4 | 3196 | |
73ffa904 | 3197 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3198 | goto done; |
3199 | ||
0c1bc5c6 | 3200 | switch (chan->mode) { |
f2fcfcd6 GP |
3201 | case L2CAP_MODE_STREAMING: |
3202 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3203 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3204 | break; |
85eb53c6 | 3205 | |
848566b3 | 3206 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3207 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3208 | ||
2ba13ed6 | 3209 | /* fall through */ |
f2fcfcd6 | 3210 | default: |
8c1d787b | 3211 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3212 | break; |
3213 | } | |
3214 | ||
3215 | done: | |
0c1bc5c6 GP |
3216 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3217 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3218 | |
0c1bc5c6 | 3219 | switch (chan->mode) { |
65c7c491 | 3220 | case L2CAP_MODE_BASIC: |
8c1d787b | 3221 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3222 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3223 | break; |
3224 | ||
62547752 GP |
3225 | rfc.mode = L2CAP_MODE_BASIC; |
3226 | rfc.txwin_size = 0; | |
3227 | rfc.max_transmit = 0; | |
3228 | rfc.retrans_timeout = 0; | |
3229 | rfc.monitor_timeout = 0; | |
3230 | rfc.max_pdu_size = 0; | |
3231 | ||
63406504 | 3232 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3233 | (unsigned long) &rfc); |
65c7c491 MH |
3234 | break; |
3235 | ||
3236 | case L2CAP_MODE_ERTM: | |
3237 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3238 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3239 | |
3240 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
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); |
f2fcfcd6 | 3246 | |
6327eb98 AE |
3247 | l2cap_txwin_setup(chan); |
3248 | ||
3249 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3250 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3251 | |
63406504 | 3252 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3253 | (unsigned long) &rfc); |
63406504 | 3254 | |
f89cef09 AE |
3255 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3256 | l2cap_add_opt_efs(&ptr, chan); | |
3257 | ||
6327eb98 AE |
3258 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3259 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3260 | chan->tx_win); |
60918918 AE |
3261 | |
3262 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3263 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3264 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3265 | chan->fcs = L2CAP_FCS_NONE; |
3266 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3267 | chan->fcs); | |
3268 | } | |
f2fcfcd6 GP |
3269 | break; |
3270 | ||
3271 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3272 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3273 | rfc.mode = L2CAP_MODE_STREAMING; |
3274 | rfc.txwin_size = 0; | |
3275 | rfc.max_transmit = 0; | |
3276 | rfc.retrans_timeout = 0; | |
3277 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3278 | |
3279 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3280 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3281 | L2CAP_FCS_SIZE); | |
c8f79162 | 3282 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3283 | |
63406504 | 3284 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3285 | (unsigned long) &rfc); |
63406504 | 3286 | |
f89cef09 AE |
3287 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3288 | l2cap_add_opt_efs(&ptr, chan); | |
3289 | ||
60918918 AE |
3290 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3291 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3292 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3293 | chan->fcs = L2CAP_FCS_NONE; |
3294 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3295 | chan->fcs); | |
3296 | } | |
65c7c491 MH |
3297 | break; |
3298 | } | |
1da177e4 | 3299 | |
fe4128e0 | 3300 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3301 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
3302 | |
3303 | return ptr - data; | |
3304 | } | |
3305 | ||
73ffa904 | 3306 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3307 | { |
5dee9e7c MH |
3308 | struct l2cap_conf_rsp *rsp = data; |
3309 | void *ptr = rsp->data; | |
73ffa904 GP |
3310 | void *req = chan->conf_req; |
3311 | int len = chan->conf_len; | |
5dee9e7c MH |
3312 | int type, hint, olen; |
3313 | unsigned long val; | |
6464f35f | 3314 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3315 | struct l2cap_conf_efs efs; |
3316 | u8 remote_efs = 0; | |
861d6882 | 3317 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3318 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3319 | u16 size; |
1da177e4 | 3320 | |
73ffa904 | 3321 | BT_DBG("chan %p", chan); |
820ae1b8 | 3322 | |
5dee9e7c MH |
3323 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3324 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3325 | |
589d2746 | 3326 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3327 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3328 | |
3329 | switch (type) { | |
3330 | case L2CAP_CONF_MTU: | |
861d6882 | 3331 | mtu = val; |
5dee9e7c MH |
3332 | break; |
3333 | ||
3334 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3335 | chan->flush_to = val; |
5dee9e7c MH |
3336 | break; |
3337 | ||
3338 | case L2CAP_CONF_QOS: | |
3339 | break; | |
3340 | ||
6464f35f MH |
3341 | case L2CAP_CONF_RFC: |
3342 | if (olen == sizeof(rfc)) | |
3343 | memcpy(&rfc, (void *) val, olen); | |
3344 | break; | |
3345 | ||
fcc203c3 GP |
3346 | case L2CAP_CONF_FCS: |
3347 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3348 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3349 | break; |
fcc203c3 | 3350 | |
42dceae2 AE |
3351 | case L2CAP_CONF_EFS: |
3352 | remote_efs = 1; | |
3353 | if (olen == sizeof(efs)) | |
3354 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3355 | break; |
3356 | ||
6327eb98 | 3357 | case L2CAP_CONF_EWS: |
848566b3 | 3358 | if (!chan->conn->hs_enabled) |
6327eb98 | 3359 | return -ECONNREFUSED; |
fcc203c3 | 3360 | |
6327eb98 AE |
3361 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3362 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3363 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3364 | chan->remote_tx_win = val; |
fcc203c3 GP |
3365 | break; |
3366 | ||
5dee9e7c MH |
3367 | default: |
3368 | if (hint) | |
3369 | break; | |
3370 | ||
3371 | result = L2CAP_CONF_UNKNOWN; | |
3372 | *((u8 *) ptr++) = type; | |
3373 | break; | |
3374 | } | |
3375 | } | |
3376 | ||
73ffa904 | 3377 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3378 | goto done; |
3379 | ||
0c1bc5c6 | 3380 | switch (chan->mode) { |
f2fcfcd6 GP |
3381 | case L2CAP_MODE_STREAMING: |
3382 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3383 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3384 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3385 | chan->conn->feat_mask); |
85eb53c6 GP |
3386 | break; |
3387 | } | |
3388 | ||
42dceae2 | 3389 | if (remote_efs) { |
848566b3 | 3390 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3391 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3392 | else | |
3393 | return -ECONNREFUSED; | |
3394 | } | |
3395 | ||
0c1bc5c6 | 3396 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3397 | return -ECONNREFUSED; |
742e519b | 3398 | |
f2fcfcd6 | 3399 | break; |
f2fcfcd6 GP |
3400 | } |
3401 | ||
3402 | done: | |
0c1bc5c6 | 3403 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3404 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3405 | rfc.mode = chan->mode; |
f2fcfcd6 | 3406 | |
73ffa904 | 3407 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3408 | return -ECONNREFUSED; |
3409 | ||
2d792818 GP |
3410 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3411 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3412 | } |
3413 | ||
5dee9e7c MH |
3414 | if (result == L2CAP_CONF_SUCCESS) { |
3415 | /* Configure output options and let the other side know | |
3416 | * which ones we don't like. */ | |
3417 | ||
f2fcfcd6 GP |
3418 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3419 | result = L2CAP_CONF_UNACCEPT; | |
3420 | else { | |
0c1bc5c6 | 3421 | chan->omtu = mtu; |
c1360a1c | 3422 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3423 | } |
0c1bc5c6 | 3424 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3425 | |
42dceae2 AE |
3426 | if (remote_efs) { |
3427 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3428 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3429 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3430 | |
3431 | result = L2CAP_CONF_UNACCEPT; | |
3432 | ||
3433 | if (chan->num_conf_req >= 1) | |
3434 | return -ECONNREFUSED; | |
3435 | ||
3436 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3437 | sizeof(efs), |
3438 | (unsigned long) &efs); | |
0e8b207e | 3439 | } else { |
3e6b3b95 | 3440 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3441 | result = L2CAP_CONF_PENDING; |
3442 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3443 | } |
3444 | } | |
3445 | ||
f2fcfcd6 GP |
3446 | switch (rfc.mode) { |
3447 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3448 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3449 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3450 | break; |
3451 | ||
3452 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3453 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3454 | chan->remote_tx_win = rfc.txwin_size; | |
3455 | else | |
3456 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3457 | |
2c03a7a4 | 3458 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3459 | |
c8f79162 | 3460 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3461 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3462 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3463 | rfc.max_pdu_size = cpu_to_le16(size); |
3464 | chan->remote_mps = size; | |
f2fcfcd6 | 3465 | |
36c86c85 | 3466 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3467 | |
c1360a1c | 3468 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3469 | |
3470 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3471 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3472 | |
42dceae2 AE |
3473 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3474 | chan->remote_id = efs.id; | |
3475 | chan->remote_stype = efs.stype; | |
3476 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3477 | chan->remote_flush_to = | |
2d792818 | 3478 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3479 | chan->remote_acc_lat = |
2d792818 | 3480 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3481 | chan->remote_sdu_itime = |
3482 | le32_to_cpu(efs.sdu_itime); | |
3483 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3484 | sizeof(efs), |
3485 | (unsigned long) &efs); | |
42dceae2 | 3486 | } |
f2fcfcd6 GP |
3487 | break; |
3488 | ||
3489 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3490 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3491 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3492 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3493 | rfc.max_pdu_size = cpu_to_le16(size); |
3494 | chan->remote_mps = size; | |
f2fcfcd6 | 3495 | |
c1360a1c | 3496 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3497 | |
2d792818 GP |
3498 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3499 | (unsigned long) &rfc); | |
68ae6639 | 3500 | |
f2fcfcd6 GP |
3501 | break; |
3502 | ||
3503 | default: | |
5dee9e7c | 3504 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3505 | |
6464f35f | 3506 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3507 | rfc.mode = chan->mode; |
f2fcfcd6 | 3508 | } |
6464f35f | 3509 | |
f2fcfcd6 | 3510 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3511 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3512 | } |
fe4128e0 | 3513 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3514 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3515 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3516 | |
3517 | return ptr - data; | |
1da177e4 LT |
3518 | } |
3519 | ||
2d792818 GP |
3520 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3521 | void *data, u16 *result) | |
f2fcfcd6 | 3522 | { |
f2fcfcd6 GP |
3523 | struct l2cap_conf_req *req = data; |
3524 | void *ptr = req->data; | |
3525 | int type, olen; | |
3526 | unsigned long val; | |
36e999a8 | 3527 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3528 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3529 | |
fe4128e0 | 3530 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3531 | |
3532 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3533 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3534 | ||
3535 | switch (type) { | |
3536 | case L2CAP_CONF_MTU: | |
3537 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3538 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3539 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3540 | } else |
0c1bc5c6 GP |
3541 | chan->imtu = val; |
3542 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3543 | break; |
3544 | ||
3545 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3546 | chan->flush_to = val; |
f2fcfcd6 | 3547 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3548 | 2, chan->flush_to); |
f2fcfcd6 GP |
3549 | break; |
3550 | ||
3551 | case L2CAP_CONF_RFC: | |
3552 | if (olen == sizeof(rfc)) | |
3553 | memcpy(&rfc, (void *)val, olen); | |
3554 | ||
c1360a1c | 3555 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3556 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3557 | return -ECONNREFUSED; |
3558 | ||
47d1ec61 | 3559 | chan->fcs = 0; |
f2fcfcd6 GP |
3560 | |
3561 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3562 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3563 | break; |
6327eb98 AE |
3564 | |
3565 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3566 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3567 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3568 | chan->tx_win); |
6327eb98 | 3569 | break; |
66af7aaf AE |
3570 | |
3571 | case L2CAP_CONF_EFS: | |
3572 | if (olen == sizeof(efs)) | |
3573 | memcpy(&efs, (void *)val, olen); | |
3574 | ||
3575 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3576 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3577 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3578 | return -ECONNREFUSED; |
3579 | ||
2d792818 GP |
3580 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3581 | (unsigned long) &efs); | |
66af7aaf | 3582 | break; |
cbabee78 AE |
3583 | |
3584 | case L2CAP_CONF_FCS: | |
3585 | if (*result == L2CAP_CONF_PENDING) | |
3586 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3587 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3588 | &chan->conf_state); |
3589 | break; | |
f2fcfcd6 GP |
3590 | } |
3591 | } | |
3592 | ||
0c1bc5c6 | 3593 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3594 | return -ECONNREFUSED; |
3595 | ||
0c1bc5c6 | 3596 | chan->mode = rfc.mode; |
6c2ea7a8 | 3597 | |
0e8b207e | 3598 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3599 | switch (rfc.mode) { |
3600 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3601 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3602 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3603 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3604 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3605 | chan->ack_win = min_t(u16, chan->ack_win, | |
3606 | rfc.txwin_size); | |
66af7aaf AE |
3607 | |
3608 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3609 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3610 | chan->local_sdu_itime = | |
2d792818 | 3611 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3612 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3613 | chan->local_flush_to = | |
2d792818 | 3614 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3615 | } |
f2fcfcd6 | 3616 | break; |
66af7aaf | 3617 | |
f2fcfcd6 | 3618 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3619 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3620 | } |
3621 | } | |
3622 | ||
fe4128e0 | 3623 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3624 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3625 | |
3626 | return ptr - data; | |
3627 | } | |
3628 | ||
2d792818 GP |
3629 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3630 | u16 result, u16 flags) | |
1da177e4 LT |
3631 | { |
3632 | struct l2cap_conf_rsp *rsp = data; | |
3633 | void *ptr = rsp->data; | |
1da177e4 | 3634 | |
fe4128e0 | 3635 | BT_DBG("chan %p", chan); |
1da177e4 | 3636 | |
fe4128e0 | 3637 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3638 | rsp->result = cpu_to_le16(result); |
aca3192c | 3639 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3640 | |
3641 | return ptr - data; | |
3642 | } | |
3643 | ||
8c1d787b | 3644 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3645 | { |
3646 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3647 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3648 | u8 buf[128]; |
439f34ac | 3649 | u8 rsp_code; |
710f9b0a | 3650 | |
fe4128e0 GP |
3651 | rsp.scid = cpu_to_le16(chan->dcid); |
3652 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3653 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3654 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3655 | |
3656 | if (chan->hs_hcon) | |
3657 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3658 | else | |
3659 | rsp_code = L2CAP_CONN_RSP; | |
3660 | ||
3661 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3662 | ||
3663 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3664 | |
c1360a1c | 3665 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3666 | return; |
3667 | ||
710f9b0a | 3668 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3669 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3670 | chan->num_conf_req++; |
3671 | } | |
3672 | ||
47d1ec61 | 3673 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3674 | { |
7b1c0049 GP |
3675 | int type, olen; |
3676 | unsigned long val; | |
c20f8e35 MM |
3677 | /* Use sane default values in case a misbehaving remote device |
3678 | * did not send an RFC or extended window size option. | |
3679 | */ | |
3680 | u16 txwin_ext = chan->ack_win; | |
3681 | struct l2cap_conf_rfc rfc = { | |
3682 | .mode = chan->mode, | |
3683 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3684 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3685 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3686 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3687 | }; | |
7b1c0049 | 3688 | |
47d1ec61 | 3689 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3690 | |
0c1bc5c6 | 3691 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3692 | return; |
3693 | ||
3694 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3695 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3696 | ||
c20f8e35 MM |
3697 | switch (type) { |
3698 | case L2CAP_CONF_RFC: | |
3699 | if (olen == sizeof(rfc)) | |
3700 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3701 | break; |
c20f8e35 MM |
3702 | case L2CAP_CONF_EWS: |
3703 | txwin_ext = val; | |
3704 | break; | |
3705 | } | |
7b1c0049 GP |
3706 | } |
3707 | ||
7b1c0049 GP |
3708 | switch (rfc.mode) { |
3709 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3710 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3711 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3712 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3713 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3714 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3715 | else | |
3716 | chan->ack_win = min_t(u16, chan->ack_win, | |
3717 | rfc.txwin_size); | |
7b1c0049 GP |
3718 | break; |
3719 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3720 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3721 | } |
3722 | } | |
3723 | ||
2d792818 | 3724 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3725 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3726 | u8 *data) | |
4e8402a3 | 3727 | { |
e2fd318e | 3728 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3729 | |
cb3b3152 JH |
3730 | if (cmd_len < sizeof(*rej)) |
3731 | return -EPROTO; | |
3732 | ||
e2fd318e | 3733 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3734 | return 0; |
3735 | ||
3736 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3737 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3738 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3739 | |
3740 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3741 | conn->info_ident = 0; |
984947dc | 3742 | |
4e8402a3 MH |
3743 | l2cap_conn_start(conn); |
3744 | } | |
3745 | ||
3746 | return 0; | |
3747 | } | |
3748 | ||
1700915f MM |
3749 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3750 | struct l2cap_cmd_hdr *cmd, | |
3751 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3752 | { |
1da177e4 LT |
3753 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3754 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3755 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3756 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3757 | |
3758 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3759 | __le16 psm = req->psm; |
1da177e4 | 3760 | |
097db76c | 3761 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3762 | |
3763 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3764 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
bf20fd4e | 3765 | &conn->hcon->dst, ACL_LINK); |
23691d75 | 3766 | if (!pchan) { |
1da177e4 LT |
3767 | result = L2CAP_CR_BAD_PSM; |
3768 | goto sendresp; | |
3769 | } | |
3770 | ||
3df91ea2 | 3771 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3772 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3773 | |
e7c29cb1 | 3774 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3775 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3776 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3777 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3778 | result = L2CAP_CR_SEC_BLOCK; |
3779 | goto response; | |
3780 | } | |
3781 | ||
1da177e4 LT |
3782 | result = L2CAP_CR_NO_MEM; |
3783 | ||
2dfa1003 GP |
3784 | /* Check if we already have channel with that dcid */ |
3785 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3786 | goto response; | |
3787 | ||
80b98027 | 3788 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3789 | if (!chan) |
1da177e4 LT |
3790 | goto response; |
3791 | ||
330b6c15 SS |
3792 | /* For certain devices (ex: HID mouse), support for authentication, |
3793 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3794 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3795 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3796 | */ | |
3797 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3798 | ||
7eafc59e MH |
3799 | bacpy(&chan->src, &conn->hcon->src); |
3800 | bacpy(&chan->dst, &conn->hcon->dst); | |
4f1654e0 MH |
3801 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); |
3802 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
fe4128e0 GP |
3803 | chan->psm = psm; |
3804 | chan->dcid = scid; | |
1700915f | 3805 | chan->local_amp_id = amp_id; |
1da177e4 | 3806 | |
6be36555 | 3807 | __l2cap_chan_add(conn, chan); |
48454079 | 3808 | |
fe4128e0 | 3809 | dcid = chan->scid; |
1da177e4 | 3810 | |
8d836d71 | 3811 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3812 | |
fc7f8a7e | 3813 | chan->ident = cmd->ident; |
1da177e4 | 3814 | |
984947dc | 3815 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3816 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 3817 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3818 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3819 | result = L2CAP_CR_PEND; |
3820 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3821 | chan->ops->defer(chan); |
f66dc81f | 3822 | } else { |
1700915f MM |
3823 | /* Force pending result for AMP controllers. |
3824 | * The connection will succeed after the | |
3825 | * physical link is up. | |
3826 | */ | |
6ed971ca | 3827 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3828 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3829 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3830 | } else { |
f93fa273 | 3831 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3832 | result = L2CAP_CR_PEND; |
1700915f | 3833 | } |
f66dc81f MH |
3834 | status = L2CAP_CS_NO_INFO; |
3835 | } | |
79d554a6 | 3836 | } else { |
f93fa273 | 3837 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3838 | result = L2CAP_CR_PEND; |
3839 | status = L2CAP_CS_AUTHEN_PEND; | |
3840 | } | |
3841 | } else { | |
f93fa273 | 3842 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3843 | result = L2CAP_CR_PEND; |
3844 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3845 | } |
3846 | ||
1da177e4 | 3847 | response: |
8ffb9290 | 3848 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3849 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3850 | |
3851 | sendresp: | |
aca3192c YH |
3852 | rsp.scid = cpu_to_le16(scid); |
3853 | rsp.dcid = cpu_to_le16(dcid); | |
3854 | rsp.result = cpu_to_le16(result); | |
3855 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3856 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3857 | |
3858 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3859 | struct l2cap_info_req info; | |
ac73498c | 3860 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3861 | |
3862 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3863 | conn->info_ident = l2cap_get_ident(conn); | |
3864 | ||
ba13ccd9 | 3865 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3866 | |
2d792818 GP |
3867 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3868 | sizeof(info), &info); | |
79d554a6 MH |
3869 | } |
3870 | ||
c1360a1c | 3871 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3872 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3873 | u8 buf[128]; |
c1360a1c | 3874 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3875 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3876 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3877 | chan->num_conf_req++; |
e9aeb2dd | 3878 | } |
1700915f MM |
3879 | |
3880 | return chan; | |
4c89b6aa | 3881 | } |
e9aeb2dd | 3882 | |
4c89b6aa | 3883 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3884 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3885 | { |
7b064eda JK |
3886 | struct hci_dev *hdev = conn->hcon->hdev; |
3887 | struct hci_conn *hcon = conn->hcon; | |
3888 | ||
cb3b3152 JH |
3889 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3890 | return -EPROTO; | |
3891 | ||
7b064eda JK |
3892 | hci_dev_lock(hdev); |
3893 | if (test_bit(HCI_MGMT, &hdev->dev_flags) && | |
3894 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) | |
3895 | mgmt_device_connected(hdev, &hcon->dst, hcon->type, | |
3896 | hcon->dst_type, 0, NULL, 0, | |
3897 | hcon->dev_class); | |
3898 | hci_dev_unlock(hdev); | |
3899 | ||
300229f9 | 3900 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3901 | return 0; |
3902 | } | |
3903 | ||
5909cf30 | 3904 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3905 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3906 | u8 *data) | |
1da177e4 LT |
3907 | { |
3908 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3909 | u16 scid, dcid, result, status; | |
48454079 | 3910 | struct l2cap_chan *chan; |
1da177e4 | 3911 | u8 req[128]; |
3df91ea2 | 3912 | int err; |
1da177e4 | 3913 | |
cb3b3152 JH |
3914 | if (cmd_len < sizeof(*rsp)) |
3915 | return -EPROTO; | |
3916 | ||
1da177e4 LT |
3917 | scid = __le16_to_cpu(rsp->scid); |
3918 | dcid = __le16_to_cpu(rsp->dcid); | |
3919 | result = __le16_to_cpu(rsp->result); | |
3920 | status = __le16_to_cpu(rsp->status); | |
3921 | ||
1b009c98 | 3922 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3923 | dcid, scid, result, status); |
1da177e4 | 3924 | |
3df91ea2 AE |
3925 | mutex_lock(&conn->chan_lock); |
3926 | ||
1da177e4 | 3927 | if (scid) { |
3df91ea2 AE |
3928 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3929 | if (!chan) { | |
21870b52 | 3930 | err = -EBADSLT; |
3df91ea2 AE |
3931 | goto unlock; |
3932 | } | |
1da177e4 | 3933 | } else { |
3df91ea2 AE |
3934 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3935 | if (!chan) { | |
21870b52 | 3936 | err = -EBADSLT; |
3df91ea2 AE |
3937 | goto unlock; |
3938 | } | |
1da177e4 LT |
3939 | } |
3940 | ||
3df91ea2 AE |
3941 | err = 0; |
3942 | ||
6be36555 | 3943 | l2cap_chan_lock(chan); |
48454079 | 3944 | |
1da177e4 LT |
3945 | switch (result) { |
3946 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3947 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3948 | chan->ident = 0; |
fe4128e0 | 3949 | chan->dcid = dcid; |
c1360a1c | 3950 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3951 | |
c1360a1c | 3952 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3953 | break; |
3954 | ||
1da177e4 | 3955 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3956 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3957 | chan->num_conf_req++; |
1da177e4 LT |
3958 | break; |
3959 | ||
3960 | case L2CAP_CR_PEND: | |
c1360a1c | 3961 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3962 | break; |
3963 | ||
3964 | default: | |
48454079 | 3965 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3966 | break; |
3967 | } | |
3968 | ||
6be36555 | 3969 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3970 | |
3971 | unlock: | |
3972 | mutex_unlock(&conn->chan_lock); | |
3973 | ||
3974 | return err; | |
1da177e4 LT |
3975 | } |
3976 | ||
47d1ec61 | 3977 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3978 | { |
3979 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3980 | * sides request it. | |
3981 | */ | |
0c1bc5c6 | 3982 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3983 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 3984 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 3985 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3986 | } |
3987 | ||
29d8a590 AE |
3988 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3989 | u8 ident, u16 flags) | |
3990 | { | |
3991 | struct l2cap_conn *conn = chan->conn; | |
3992 | ||
3993 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3994 | flags); | |
3995 | ||
3996 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3997 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3998 | ||
3999 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
4000 | l2cap_build_conf_rsp(chan, data, | |
4001 | L2CAP_CONF_SUCCESS, flags), data); | |
4002 | } | |
4003 | ||
662d652d JH |
4004 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
4005 | u16 scid, u16 dcid) | |
4006 | { | |
4007 | struct l2cap_cmd_rej_cid rej; | |
4008 | ||
4009 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
4010 | rej.scid = __cpu_to_le16(scid); | |
4011 | rej.dcid = __cpu_to_le16(dcid); | |
4012 | ||
4013 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
4014 | } | |
4015 | ||
2d792818 GP |
4016 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
4017 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
4018 | u8 *data) | |
1da177e4 LT |
4019 | { |
4020 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
4021 | u16 dcid, flags; | |
4022 | u8 rsp[64]; | |
48454079 | 4023 | struct l2cap_chan *chan; |
3c588192 | 4024 | int len, err = 0; |
1da177e4 | 4025 | |
cb3b3152 JH |
4026 | if (cmd_len < sizeof(*req)) |
4027 | return -EPROTO; | |
4028 | ||
1da177e4 LT |
4029 | dcid = __le16_to_cpu(req->dcid); |
4030 | flags = __le16_to_cpu(req->flags); | |
4031 | ||
4032 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
4033 | ||
baa7e1fa | 4034 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
4035 | if (!chan) { |
4036 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
4037 | return 0; | |
4038 | } | |
1da177e4 | 4039 | |
033b1142 | 4040 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
4041 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4042 | chan->dcid); | |
354f60a9 | 4043 | goto unlock; |
df6bd743 | 4044 | } |
354f60a9 | 4045 | |
5dee9e7c | 4046 | /* Reject if config buffer is too small. */ |
88219a0f | 4047 | len = cmd_len - sizeof(*req); |
cb3b3152 | 4048 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4049 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4050 | l2cap_build_conf_rsp(chan, rsp, |
4051 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4052 | goto unlock; |
4053 | } | |
4054 | ||
4055 | /* Store config. */ | |
73ffa904 GP |
4056 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4057 | chan->conf_len += len; | |
1da177e4 | 4058 | |
59e54bd1 | 4059 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4060 | /* Incomplete config. Send empty response. */ |
4061 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4062 | l2cap_build_conf_rsp(chan, rsp, |
4063 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4064 | goto unlock; |
4065 | } | |
4066 | ||
4067 | /* Complete config. */ | |
73ffa904 | 4068 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4069 | if (len < 0) { |
5e4e3972 | 4070 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4071 | goto unlock; |
f2fcfcd6 | 4072 | } |
1da177e4 | 4073 | |
1500109b | 4074 | chan->ident = cmd->ident; |
5dee9e7c | 4075 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4076 | chan->num_conf_rsp++; |
5dee9e7c | 4077 | |
5dee9e7c | 4078 | /* Reset config buffer. */ |
73ffa904 | 4079 | chan->conf_len = 0; |
5dee9e7c | 4080 | |
c1360a1c | 4081 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4082 | goto unlock; |
4083 | ||
c1360a1c | 4084 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4085 | set_default_fcs(chan); |
fcc203c3 | 4086 | |
105bdf9e MM |
4087 | if (chan->mode == L2CAP_MODE_ERTM || |
4088 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4089 | err = l2cap_ertm_init(chan); |
4090 | ||
4091 | if (err < 0) | |
5e4e3972 | 4092 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4093 | else |
4094 | l2cap_chan_ready(chan); | |
0565c1c2 | 4095 | |
876d9484 MH |
4096 | goto unlock; |
4097 | } | |
4098 | ||
c1360a1c | 4099 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4100 | u8 buf[64]; |
1da177e4 | 4101 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4102 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4103 | chan->num_conf_req++; |
1da177e4 LT |
4104 | } |
4105 | ||
0e8b207e AE |
4106 | /* Got Conf Rsp PENDING from remote side and asume we sent |
4107 | Conf Rsp PENDING in the code above */ | |
4108 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4109 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4110 | |
4111 | /* check compatibility */ | |
4112 | ||
79de886d | 4113 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4114 | if (!chan->hs_hcon) |
79de886d AE |
4115 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4116 | else | |
4117 | chan->ident = cmd->ident; | |
0e8b207e AE |
4118 | } |
4119 | ||
1da177e4 | 4120 | unlock: |
6be36555 | 4121 | l2cap_chan_unlock(chan); |
3c588192 | 4122 | return err; |
1da177e4 LT |
4123 | } |
4124 | ||
2d792818 | 4125 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4126 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4127 | u8 *data) | |
1da177e4 LT |
4128 | { |
4129 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4130 | u16 scid, flags, result; | |
48454079 | 4131 | struct l2cap_chan *chan; |
cb3b3152 | 4132 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4133 | int err = 0; |
1da177e4 | 4134 | |
cb3b3152 JH |
4135 | if (cmd_len < sizeof(*rsp)) |
4136 | return -EPROTO; | |
4137 | ||
1da177e4 LT |
4138 | scid = __le16_to_cpu(rsp->scid); |
4139 | flags = __le16_to_cpu(rsp->flags); | |
4140 | result = __le16_to_cpu(rsp->result); | |
4141 | ||
61386cba AE |
4142 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4143 | result, len); | |
1da177e4 | 4144 | |
baa7e1fa | 4145 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4146 | if (!chan) |
1da177e4 LT |
4147 | return 0; |
4148 | ||
4149 | switch (result) { | |
4150 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4151 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4152 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4153 | break; |
4154 | ||
0e8b207e AE |
4155 | case L2CAP_CONF_PENDING: |
4156 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4157 | ||
4158 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4159 | char buf[64]; | |
4160 | ||
4161 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4162 | buf, &result); |
0e8b207e | 4163 | if (len < 0) { |
5e4e3972 | 4164 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4165 | goto done; |
4166 | } | |
4167 | ||
f351bc72 | 4168 | if (!chan->hs_hcon) { |
79de886d AE |
4169 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4170 | 0); | |
5ce66b59 AE |
4171 | } else { |
4172 | if (l2cap_check_efs(chan)) { | |
4173 | amp_create_logical_link(chan); | |
4174 | chan->ident = cmd->ident; | |
4175 | } | |
4176 | } | |
0e8b207e AE |
4177 | } |
4178 | goto done; | |
4179 | ||
1da177e4 | 4180 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4181 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4182 | char req[64]; |
4183 | ||
c2c77ec8 | 4184 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4185 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4186 | goto done; |
4187 | } | |
4188 | ||
f2fcfcd6 GP |
4189 | /* throw out any old stored conf requests */ |
4190 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4191 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4192 | req, &result); |
f2fcfcd6 | 4193 | if (len < 0) { |
5e4e3972 | 4194 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4195 | goto done; |
4196 | } | |
4197 | ||
4198 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4199 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4200 | chan->num_conf_req++; |
f2fcfcd6 GP |
4201 | if (result != L2CAP_CONF_SUCCESS) |
4202 | goto done; | |
4203 | break; | |
1da177e4 LT |
4204 | } |
4205 | ||
8e87d142 | 4206 | default: |
6be36555 | 4207 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4208 | |
ba13ccd9 | 4209 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4210 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4211 | goto done; |
4212 | } | |
4213 | ||
59e54bd1 | 4214 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4215 | goto done; |
4216 | ||
c1360a1c | 4217 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4218 | |
c1360a1c | 4219 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4220 | set_default_fcs(chan); |
fcc203c3 | 4221 | |
105bdf9e MM |
4222 | if (chan->mode == L2CAP_MODE_ERTM || |
4223 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4224 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4225 | |
3c588192 | 4226 | if (err < 0) |
5e4e3972 | 4227 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4228 | else |
4229 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4230 | } |
4231 | ||
4232 | done: | |
6be36555 | 4233 | l2cap_chan_unlock(chan); |
3c588192 | 4234 | return err; |
1da177e4 LT |
4235 | } |
4236 | ||
2d792818 | 4237 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4238 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4239 | u8 *data) | |
1da177e4 LT |
4240 | { |
4241 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4242 | struct l2cap_disconn_rsp rsp; | |
4243 | u16 dcid, scid; | |
48454079 | 4244 | struct l2cap_chan *chan; |
1da177e4 | 4245 | |
cb3b3152 JH |
4246 | if (cmd_len != sizeof(*req)) |
4247 | return -EPROTO; | |
4248 | ||
1da177e4 LT |
4249 | scid = __le16_to_cpu(req->scid); |
4250 | dcid = __le16_to_cpu(req->dcid); | |
4251 | ||
4252 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4253 | ||
3df91ea2 AE |
4254 | mutex_lock(&conn->chan_lock); |
4255 | ||
4256 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4257 | if (!chan) { | |
4258 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4259 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4260 | return 0; | |
3df91ea2 | 4261 | } |
1da177e4 | 4262 | |
6be36555 AE |
4263 | l2cap_chan_lock(chan); |
4264 | ||
fe4128e0 GP |
4265 | rsp.dcid = cpu_to_le16(chan->scid); |
4266 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4267 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4268 | ||
5ec1bbe5 | 4269 | chan->ops->set_shutdown(chan); |
1da177e4 | 4270 | |
61d6ef3e | 4271 | l2cap_chan_hold(chan); |
48454079 | 4272 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4273 | |
4274 | l2cap_chan_unlock(chan); | |
1da177e4 | 4275 | |
80b98027 | 4276 | chan->ops->close(chan); |
61d6ef3e | 4277 | l2cap_chan_put(chan); |
3df91ea2 AE |
4278 | |
4279 | mutex_unlock(&conn->chan_lock); | |
4280 | ||
1da177e4 LT |
4281 | return 0; |
4282 | } | |
4283 | ||
2d792818 | 4284 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4285 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4286 | u8 *data) | |
1da177e4 LT |
4287 | { |
4288 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4289 | u16 dcid, scid; | |
48454079 | 4290 | struct l2cap_chan *chan; |
1da177e4 | 4291 | |
cb3b3152 JH |
4292 | if (cmd_len != sizeof(*rsp)) |
4293 | return -EPROTO; | |
4294 | ||
1da177e4 LT |
4295 | scid = __le16_to_cpu(rsp->scid); |
4296 | dcid = __le16_to_cpu(rsp->dcid); | |
4297 | ||
4298 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4299 | ||
3df91ea2 AE |
4300 | mutex_lock(&conn->chan_lock); |
4301 | ||
4302 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4303 | if (!chan) { | |
4304 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4305 | return 0; |
3df91ea2 | 4306 | } |
1da177e4 | 4307 | |
6be36555 | 4308 | l2cap_chan_lock(chan); |
48454079 | 4309 | |
61d6ef3e | 4310 | l2cap_chan_hold(chan); |
48454079 | 4311 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4312 | |
4313 | l2cap_chan_unlock(chan); | |
1da177e4 | 4314 | |
80b98027 | 4315 | chan->ops->close(chan); |
61d6ef3e | 4316 | l2cap_chan_put(chan); |
3df91ea2 AE |
4317 | |
4318 | mutex_unlock(&conn->chan_lock); | |
4319 | ||
1da177e4 LT |
4320 | return 0; |
4321 | } | |
4322 | ||
2d792818 | 4323 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4324 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4325 | u8 *data) | |
1da177e4 LT |
4326 | { |
4327 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4328 | u16 type; |
4329 | ||
cb3b3152 JH |
4330 | if (cmd_len != sizeof(*req)) |
4331 | return -EPROTO; | |
4332 | ||
1da177e4 LT |
4333 | type = __le16_to_cpu(req->type); |
4334 | ||
4335 | BT_DBG("type 0x%4.4x", type); | |
4336 | ||
f0709e03 MH |
4337 | if (type == L2CAP_IT_FEAT_MASK) { |
4338 | u8 buf[8]; | |
44dd46de | 4339 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4340 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
4341 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4342 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4343 | if (!disable_ertm) |
fcc203c3 | 4344 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4345 | | L2CAP_FEAT_FCS; |
848566b3 | 4346 | if (conn->hs_enabled) |
6327eb98 | 4347 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4348 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4349 | |
1b7bf4ed | 4350 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4351 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4352 | buf); | |
e1027a7c MH |
4353 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4354 | u8 buf[12]; | |
4355 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4356 | |
848566b3 | 4357 | if (conn->hs_enabled) |
50a147cd MM |
4358 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; |
4359 | else | |
4360 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4361 | ||
ac73498c AE |
4362 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4363 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4364 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4365 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4366 | buf); | |
f0709e03 MH |
4367 | } else { |
4368 | struct l2cap_info_rsp rsp; | |
4369 | rsp.type = cpu_to_le16(type); | |
ac73498c | 4370 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4371 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4372 | &rsp); | |
f0709e03 | 4373 | } |
1da177e4 LT |
4374 | |
4375 | return 0; | |
4376 | } | |
4377 | ||
2d792818 | 4378 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4379 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4380 | u8 *data) | |
1da177e4 LT |
4381 | { |
4382 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4383 | u16 type, result; | |
4384 | ||
3f6fa3d4 | 4385 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4386 | return -EPROTO; |
4387 | ||
1da177e4 LT |
4388 | type = __le16_to_cpu(rsp->type); |
4389 | result = __le16_to_cpu(rsp->result); | |
4390 | ||
4391 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4392 | ||
e90165be AE |
4393 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4394 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4395 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4396 | return 0; |
4397 | ||
17cd3f37 | 4398 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4399 | |
adb08ede VT |
4400 | if (result != L2CAP_IR_SUCCESS) { |
4401 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4402 | conn->info_ident = 0; | |
4403 | ||
4404 | l2cap_conn_start(conn); | |
4405 | ||
4406 | return 0; | |
4407 | } | |
4408 | ||
978c93b9 AE |
4409 | switch (type) { |
4410 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4411 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4412 | |
47ec1dcd | 4413 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4414 | struct l2cap_info_req req; |
ac73498c | 4415 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4416 | |
4417 | conn->info_ident = l2cap_get_ident(conn); | |
4418 | ||
4419 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4420 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4421 | } else { |
4422 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4423 | conn->info_ident = 0; | |
4424 | ||
4425 | l2cap_conn_start(conn); | |
4426 | } | |
978c93b9 AE |
4427 | break; |
4428 | ||
4429 | case L2CAP_IT_FIXED_CHAN: | |
4430 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4431 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4432 | conn->info_ident = 0; |
984947dc MH |
4433 | |
4434 | l2cap_conn_start(conn); | |
978c93b9 | 4435 | break; |
984947dc | 4436 | } |
4e8402a3 | 4437 | |
1da177e4 LT |
4438 | return 0; |
4439 | } | |
4440 | ||
1700915f MM |
4441 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4442 | struct l2cap_cmd_hdr *cmd, | |
4443 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4444 | { |
4445 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4446 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4447 | struct l2cap_chan *chan; |
6e1df6a6 | 4448 | struct hci_dev *hdev; |
f94ff6ff MM |
4449 | u16 psm, scid; |
4450 | ||
4451 | if (cmd_len != sizeof(*req)) | |
4452 | return -EPROTO; | |
4453 | ||
848566b3 | 4454 | if (!conn->hs_enabled) |
f94ff6ff MM |
4455 | return -EINVAL; |
4456 | ||
4457 | psm = le16_to_cpu(req->psm); | |
4458 | scid = le16_to_cpu(req->scid); | |
4459 | ||
ad0ac6ca | 4460 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4461 | |
6e1df6a6 | 4462 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4463 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4464 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4465 | req->amp_id); | |
4466 | return 0; | |
4467 | } | |
1700915f | 4468 | |
6e1df6a6 AE |
4469 | /* Validate AMP controller id */ |
4470 | hdev = hci_dev_get(req->amp_id); | |
4471 | if (!hdev) | |
4472 | goto error; | |
1700915f | 4473 | |
6e1df6a6 AE |
4474 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4475 | hci_dev_put(hdev); | |
4476 | goto error; | |
4477 | } | |
1700915f | 4478 | |
6e1df6a6 AE |
4479 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4480 | req->amp_id); | |
4481 | if (chan) { | |
4482 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4483 | struct hci_conn *hs_hcon; | |
1700915f | 4484 | |
98e0f7ea MH |
4485 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4486 | &conn->hcon->dst); | |
6e1df6a6 AE |
4487 | if (!hs_hcon) { |
4488 | hci_dev_put(hdev); | |
662d652d JH |
4489 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4490 | chan->dcid); | |
4491 | return 0; | |
1700915f MM |
4492 | } |
4493 | ||
6e1df6a6 AE |
4494 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4495 | ||
6e1df6a6 AE |
4496 | mgr->bredr_chan = chan; |
4497 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4498 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4499 | conn->mtu = hdev->block_mtu; |
1700915f | 4500 | } |
f94ff6ff | 4501 | |
6e1df6a6 | 4502 | hci_dev_put(hdev); |
f94ff6ff MM |
4503 | |
4504 | return 0; | |
6e1df6a6 AE |
4505 | |
4506 | error: | |
4507 | rsp.dcid = 0; | |
4508 | rsp.scid = cpu_to_le16(scid); | |
4509 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); | |
4510 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
4511 | ||
4512 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4513 | sizeof(rsp), &rsp); | |
4514 | ||
dc280801 | 4515 | return 0; |
f94ff6ff MM |
4516 | } |
4517 | ||
8eb200bd MM |
4518 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4519 | { | |
4520 | struct l2cap_move_chan_req req; | |
4521 | u8 ident; | |
4522 | ||
4523 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4524 | ||
4525 | ident = l2cap_get_ident(chan->conn); | |
4526 | chan->ident = ident; | |
4527 | ||
4528 | req.icid = cpu_to_le16(chan->scid); | |
4529 | req.dest_amp_id = dest_amp_id; | |
4530 | ||
4531 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4532 | &req); | |
4533 | ||
4534 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4535 | } | |
4536 | ||
1500109b | 4537 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4538 | { |
4539 | struct l2cap_move_chan_rsp rsp; | |
4540 | ||
1500109b | 4541 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4542 | |
1500109b | 4543 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4544 | rsp.result = cpu_to_le16(result); |
4545 | ||
1500109b MM |
4546 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4547 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4548 | } |
4549 | ||
5b155ef9 | 4550 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4551 | { |
4552 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4553 | |
5b155ef9 | 4554 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4555 | |
5b155ef9 | 4556 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4557 | |
5b155ef9 | 4558 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4559 | cfm.result = cpu_to_le16(result); |
4560 | ||
5b155ef9 MM |
4561 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4562 | sizeof(cfm), &cfm); | |
4563 | ||
4564 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4565 | } | |
4566 | ||
4567 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4568 | { | |
4569 | struct l2cap_move_chan_cfm cfm; | |
4570 | ||
4571 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4572 | ||
4573 | cfm.icid = cpu_to_le16(icid); | |
4574 | cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); | |
4575 | ||
4576 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4577 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4578 | } |
4579 | ||
4580 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4581 | u16 icid) |
8d5a04a1 MM |
4582 | { |
4583 | struct l2cap_move_chan_cfm_rsp rsp; | |
4584 | ||
ad0ac6ca | 4585 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4586 | |
4587 | rsp.icid = cpu_to_le16(icid); | |
4588 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4589 | } | |
4590 | ||
5f3847a4 MM |
4591 | static void __release_logical_link(struct l2cap_chan *chan) |
4592 | { | |
4593 | chan->hs_hchan = NULL; | |
4594 | chan->hs_hcon = NULL; | |
4595 | ||
4596 | /* Placeholder - release the logical link */ | |
4597 | } | |
4598 | ||
1500109b MM |
4599 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4600 | { | |
4601 | /* Logical link setup failed */ | |
4602 | if (chan->state != BT_CONNECTED) { | |
4603 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4604 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4605 | return; |
4606 | } | |
4607 | ||
4608 | switch (chan->move_role) { | |
4609 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4610 | l2cap_move_done(chan); | |
4611 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4612 | break; | |
4613 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4614 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4615 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4616 | /* Remote has only sent pending or | |
4617 | * success responses, clean up | |
4618 | */ | |
4619 | l2cap_move_done(chan); | |
4620 | } | |
4621 | ||
4622 | /* Other amp move states imply that the move | |
4623 | * has already aborted | |
4624 | */ | |
4625 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4626 | break; | |
4627 | } | |
4628 | } | |
4629 | ||
4630 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4631 | struct hci_chan *hchan) | |
4632 | { | |
4633 | struct l2cap_conf_rsp rsp; | |
1500109b | 4634 | |
336178a3 | 4635 | chan->hs_hchan = hchan; |
1500109b MM |
4636 | chan->hs_hcon->l2cap_data = chan->conn; |
4637 | ||
35ba9561 | 4638 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4639 | |
4640 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4641 | int err; |
1500109b MM |
4642 | |
4643 | set_default_fcs(chan); | |
4644 | ||
4645 | err = l2cap_ertm_init(chan); | |
4646 | if (err < 0) | |
5e4e3972 | 4647 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4648 | else |
4649 | l2cap_chan_ready(chan); | |
4650 | } | |
4651 | } | |
4652 | ||
4653 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4654 | struct hci_chan *hchan) | |
4655 | { | |
4656 | chan->hs_hcon = hchan->conn; | |
4657 | chan->hs_hcon->l2cap_data = chan->conn; | |
4658 | ||
4659 | BT_DBG("move_state %d", chan->move_state); | |
4660 | ||
4661 | switch (chan->move_state) { | |
4662 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4663 | /* Move confirm will be sent after a success | |
4664 | * response is received | |
4665 | */ | |
4666 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4667 | break; | |
4668 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4669 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4670 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4671 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4672 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4673 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4674 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4675 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4676 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4677 | } | |
4678 | break; | |
4679 | default: | |
4680 | /* Move was not in expected state, free the channel */ | |
4681 | __release_logical_link(chan); | |
4682 | ||
4683 | chan->move_state = L2CAP_MOVE_STABLE; | |
4684 | } | |
4685 | } | |
4686 | ||
4687 | /* Call with chan locked */ | |
27695fb4 AE |
4688 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4689 | u8 status) | |
5b155ef9 | 4690 | { |
1500109b MM |
4691 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4692 | ||
4693 | if (status) { | |
4694 | l2cap_logical_fail(chan); | |
4695 | __release_logical_link(chan); | |
4696 | return; | |
4697 | } | |
4698 | ||
4699 | if (chan->state != BT_CONNECTED) { | |
4700 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4701 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4702 | l2cap_logical_finish_create(chan, hchan); |
4703 | } else { | |
4704 | l2cap_logical_finish_move(chan, hchan); | |
4705 | } | |
5b155ef9 MM |
4706 | } |
4707 | ||
3f7a56c4 MM |
4708 | void l2cap_move_start(struct l2cap_chan *chan) |
4709 | { | |
4710 | BT_DBG("chan %p", chan); | |
4711 | ||
6ed971ca | 4712 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4713 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4714 | return; | |
4715 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4716 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4717 | /* Placeholder - start physical link setup */ | |
4718 | } else { | |
4719 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4720 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4721 | chan->move_id = 0; | |
4722 | l2cap_move_setup(chan); | |
4723 | l2cap_send_move_chan_req(chan, 0); | |
4724 | } | |
4725 | } | |
4726 | ||
8eb200bd MM |
4727 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4728 | u8 local_amp_id, u8 remote_amp_id) | |
4729 | { | |
62748ca1 AE |
4730 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4731 | local_amp_id, remote_amp_id); | |
4732 | ||
12d6cc60 AE |
4733 | chan->fcs = L2CAP_FCS_NONE; |
4734 | ||
62748ca1 AE |
4735 | /* Outgoing channel on AMP */ |
4736 | if (chan->state == BT_CONNECT) { | |
4737 | if (result == L2CAP_CR_SUCCESS) { | |
4738 | chan->local_amp_id = local_amp_id; | |
4739 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4740 | } else { | |
4741 | /* Revert to BR/EDR connect */ | |
4742 | l2cap_send_conn_req(chan); | |
4743 | } | |
4744 | ||
4745 | return; | |
4746 | } | |
4747 | ||
4748 | /* Incoming channel on AMP */ | |
4749 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4750 | struct l2cap_conn_rsp rsp; |
4751 | char buf[128]; | |
4752 | rsp.scid = cpu_to_le16(chan->dcid); | |
4753 | rsp.dcid = cpu_to_le16(chan->scid); | |
4754 | ||
8eb200bd MM |
4755 | if (result == L2CAP_CR_SUCCESS) { |
4756 | /* Send successful response */ | |
62cd50e2 AE |
4757 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
4758 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4759 | } else { |
4760 | /* Send negative response */ | |
62cd50e2 AE |
4761 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4762 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4763 | } |
4764 | ||
4765 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4766 | sizeof(rsp), &rsp); | |
4767 | ||
4768 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4769 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4770 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4771 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4772 | L2CAP_CONF_REQ, | |
4773 | l2cap_build_conf_req(chan, buf), buf); | |
4774 | chan->num_conf_req++; | |
4775 | } | |
8eb200bd MM |
4776 | } |
4777 | } | |
4778 | ||
4779 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4780 | u8 remote_amp_id) | |
4781 | { | |
4782 | l2cap_move_setup(chan); | |
4783 | chan->move_id = local_amp_id; | |
4784 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4785 | ||
4786 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4787 | } | |
4788 | ||
4789 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4790 | { | |
4791 | struct hci_chan *hchan = NULL; | |
4792 | ||
4793 | /* Placeholder - get hci_chan for logical link */ | |
4794 | ||
4795 | if (hchan) { | |
4796 | if (hchan->state == BT_CONNECTED) { | |
4797 | /* Logical link is ready to go */ | |
4798 | chan->hs_hcon = hchan->conn; | |
4799 | chan->hs_hcon->l2cap_data = chan->conn; | |
4800 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4801 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4802 | ||
4803 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4804 | } else { | |
4805 | /* Wait for logical link to be ready */ | |
4806 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4807 | } | |
4808 | } else { | |
4809 | /* Logical link not available */ | |
4810 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4811 | } | |
4812 | } | |
4813 | ||
4814 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4815 | { | |
4816 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4817 | u8 rsp_result; | |
4818 | if (result == -EINVAL) | |
4819 | rsp_result = L2CAP_MR_BAD_ID; | |
4820 | else | |
4821 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4822 | ||
4823 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4824 | } | |
4825 | ||
4826 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4827 | chan->move_state = L2CAP_MOVE_STABLE; | |
4828 | ||
4829 | /* Restart data transmission */ | |
4830 | l2cap_ertm_send(chan); | |
4831 | } | |
4832 | ||
a514b17f AE |
4833 | /* Invoke with locked chan */ |
4834 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4835 | { |
770bfefa | 4836 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4837 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4838 | |
8eb200bd MM |
4839 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4840 | chan, result, local_amp_id, remote_amp_id); | |
4841 | ||
8eb200bd MM |
4842 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4843 | l2cap_chan_unlock(chan); | |
4844 | return; | |
4845 | } | |
4846 | ||
4847 | if (chan->state != BT_CONNECTED) { | |
4848 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4849 | } else if (result != L2CAP_MR_SUCCESS) { | |
4850 | l2cap_do_move_cancel(chan, result); | |
4851 | } else { | |
4852 | switch (chan->move_role) { | |
4853 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4854 | l2cap_do_move_initiate(chan, local_amp_id, | |
4855 | remote_amp_id); | |
4856 | break; | |
4857 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4858 | l2cap_do_move_respond(chan, result); | |
4859 | break; | |
4860 | default: | |
4861 | l2cap_do_move_cancel(chan, result); | |
4862 | break; | |
4863 | } | |
4864 | } | |
8eb200bd MM |
4865 | } |
4866 | ||
8d5a04a1 | 4867 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4868 | struct l2cap_cmd_hdr *cmd, |
4869 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4870 | { |
4871 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4872 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4873 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4874 | u16 icid = 0; |
4875 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4876 | ||
4877 | if (cmd_len != sizeof(*req)) | |
4878 | return -EPROTO; | |
4879 | ||
4880 | icid = le16_to_cpu(req->icid); | |
4881 | ||
ad0ac6ca | 4882 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4883 | |
848566b3 | 4884 | if (!conn->hs_enabled) |
8d5a04a1 MM |
4885 | return -EINVAL; |
4886 | ||
02b0fbb9 MM |
4887 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4888 | if (!chan) { | |
1500109b MM |
4889 | rsp.icid = cpu_to_le16(icid); |
4890 | rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); | |
4891 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, | |
4892 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4893 | return 0; |
4894 | } | |
4895 | ||
1500109b MM |
4896 | chan->ident = cmd->ident; |
4897 | ||
02b0fbb9 MM |
4898 | if (chan->scid < L2CAP_CID_DYN_START || |
4899 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4900 | (chan->mode != L2CAP_MODE_ERTM && | |
4901 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4902 | result = L2CAP_MR_NOT_ALLOWED; | |
4903 | goto send_move_response; | |
4904 | } | |
4905 | ||
4906 | if (chan->local_amp_id == req->dest_amp_id) { | |
4907 | result = L2CAP_MR_SAME_ID; | |
4908 | goto send_move_response; | |
4909 | } | |
4910 | ||
6ed971ca | 4911 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4912 | struct hci_dev *hdev; |
4913 | hdev = hci_dev_get(req->dest_amp_id); | |
4914 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4915 | !test_bit(HCI_UP, &hdev->flags)) { | |
4916 | if (hdev) | |
4917 | hci_dev_put(hdev); | |
4918 | ||
4919 | result = L2CAP_MR_BAD_ID; | |
4920 | goto send_move_response; | |
4921 | } | |
4922 | hci_dev_put(hdev); | |
4923 | } | |
4924 | ||
4925 | /* Detect a move collision. Only send a collision response | |
4926 | * if this side has "lost", otherwise proceed with the move. | |
4927 | * The winner has the larger bd_addr. | |
4928 | */ | |
4929 | if ((__chan_is_moving(chan) || | |
4930 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4931 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4932 | result = L2CAP_MR_COLLISION; |
4933 | goto send_move_response; | |
4934 | } | |
4935 | ||
02b0fbb9 MM |
4936 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4937 | l2cap_move_setup(chan); | |
4938 | chan->move_id = req->dest_amp_id; | |
4939 | icid = chan->dcid; | |
4940 | ||
6ed971ca | 4941 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4942 | /* Moving to BR/EDR */ |
4943 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4944 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4945 | result = L2CAP_MR_PEND; | |
4946 | } else { | |
4947 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4948 | result = L2CAP_MR_SUCCESS; | |
4949 | } | |
4950 | } else { | |
4951 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4952 | /* Placeholder - uncomment when amp functions are available */ | |
4953 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4954 | result = L2CAP_MR_PEND; | |
4955 | } | |
4956 | ||
4957 | send_move_response: | |
1500109b | 4958 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4959 | |
02b0fbb9 MM |
4960 | l2cap_chan_unlock(chan); |
4961 | ||
8d5a04a1 MM |
4962 | return 0; |
4963 | } | |
4964 | ||
5b155ef9 MM |
4965 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4966 | { | |
4967 | struct l2cap_chan *chan; | |
4968 | struct hci_chan *hchan = NULL; | |
4969 | ||
4970 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4971 | if (!chan) { | |
4972 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4973 | return; | |
4974 | } | |
4975 | ||
4976 | __clear_chan_timer(chan); | |
4977 | if (result == L2CAP_MR_PEND) | |
4978 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4979 | ||
4980 | switch (chan->move_state) { | |
4981 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4982 | /* Move confirm will be sent when logical link | |
4983 | * is complete. | |
4984 | */ | |
4985 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4986 | break; | |
4987 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4988 | if (result == L2CAP_MR_PEND) { | |
4989 | break; | |
4990 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4991 | &chan->conn_state)) { | |
4992 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4993 | } else { | |
4994 | /* Logical link is up or moving to BR/EDR, | |
4995 | * proceed with move | |
4996 | */ | |
4997 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4998 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4999 | } | |
5000 | break; | |
5001 | case L2CAP_MOVE_WAIT_RSP: | |
5002 | /* Moving to AMP */ | |
5003 | if (result == L2CAP_MR_SUCCESS) { | |
5004 | /* Remote is ready, send confirm immediately | |
5005 | * after logical link is ready | |
5006 | */ | |
5007 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
5008 | } else { | |
5009 | /* Both logical link and move success | |
5010 | * are required to confirm | |
5011 | */ | |
5012 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
5013 | } | |
5014 | ||
5015 | /* Placeholder - get hci_chan for logical link */ | |
5016 | if (!hchan) { | |
5017 | /* Logical link not available */ | |
5018 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5019 | break; | |
5020 | } | |
5021 | ||
5022 | /* If the logical link is not yet connected, do not | |
5023 | * send confirmation. | |
5024 | */ | |
5025 | if (hchan->state != BT_CONNECTED) | |
5026 | break; | |
5027 | ||
5028 | /* Logical link is already ready to go */ | |
5029 | ||
5030 | chan->hs_hcon = hchan->conn; | |
5031 | chan->hs_hcon->l2cap_data = chan->conn; | |
5032 | ||
5033 | if (result == L2CAP_MR_SUCCESS) { | |
5034 | /* Can confirm now */ | |
5035 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5036 | } else { | |
5037 | /* Now only need move success | |
5038 | * to confirm | |
5039 | */ | |
5040 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
5041 | } | |
5042 | ||
5043 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
5044 | break; | |
5045 | default: | |
5046 | /* Any other amp move state means the move failed. */ | |
5047 | chan->move_id = chan->local_amp_id; | |
5048 | l2cap_move_done(chan); | |
5049 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5050 | } | |
5051 | ||
5052 | l2cap_chan_unlock(chan); | |
5053 | } | |
5054 | ||
5055 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5056 | u16 result) | |
5057 | { | |
5058 | struct l2cap_chan *chan; | |
5059 | ||
5060 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5061 | if (!chan) { | |
5062 | /* Could not locate channel, icid is best guess */ | |
5063 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5064 | return; | |
5065 | } | |
5066 | ||
5067 | __clear_chan_timer(chan); | |
5068 | ||
5069 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5070 | if (result == L2CAP_MR_COLLISION) { | |
5071 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5072 | } else { | |
5073 | /* Cleanup - cancel move */ | |
5074 | chan->move_id = chan->local_amp_id; | |
5075 | l2cap_move_done(chan); | |
5076 | } | |
5077 | } | |
5078 | ||
5079 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5080 | ||
5081 | l2cap_chan_unlock(chan); | |
5082 | } | |
5083 | ||
5084 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5085 | struct l2cap_cmd_hdr *cmd, | |
5086 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5087 | { |
5088 | struct l2cap_move_chan_rsp *rsp = data; | |
5089 | u16 icid, result; | |
5090 | ||
5091 | if (cmd_len != sizeof(*rsp)) | |
5092 | return -EPROTO; | |
5093 | ||
5094 | icid = le16_to_cpu(rsp->icid); | |
5095 | result = le16_to_cpu(rsp->result); | |
5096 | ||
ad0ac6ca | 5097 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5098 | |
5b155ef9 MM |
5099 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5100 | l2cap_move_continue(conn, icid, result); | |
5101 | else | |
5102 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5103 | |
5104 | return 0; | |
5105 | } | |
5106 | ||
5f3847a4 MM |
5107 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5108 | struct l2cap_cmd_hdr *cmd, | |
5109 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5110 | { |
5111 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5112 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5113 | u16 icid, result; |
5114 | ||
5115 | if (cmd_len != sizeof(*cfm)) | |
5116 | return -EPROTO; | |
5117 | ||
5118 | icid = le16_to_cpu(cfm->icid); | |
5119 | result = le16_to_cpu(cfm->result); | |
5120 | ||
ad0ac6ca | 5121 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5122 | |
5f3847a4 MM |
5123 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5124 | if (!chan) { | |
5125 | /* Spec requires a response even if the icid was not found */ | |
5126 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5127 | return 0; | |
5128 | } | |
5129 | ||
5130 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5131 | if (result == L2CAP_MC_CONFIRMED) { | |
5132 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5133 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5134 | __release_logical_link(chan); |
5135 | } else { | |
5136 | chan->move_id = chan->local_amp_id; | |
5137 | } | |
5138 | ||
5139 | l2cap_move_done(chan); | |
5140 | } | |
5141 | ||
8d5a04a1 MM |
5142 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5143 | ||
5f3847a4 MM |
5144 | l2cap_chan_unlock(chan); |
5145 | ||
8d5a04a1 MM |
5146 | return 0; |
5147 | } | |
5148 | ||
5149 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5150 | struct l2cap_cmd_hdr *cmd, |
5151 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5152 | { |
5153 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5154 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5155 | u16 icid; |
5156 | ||
5157 | if (cmd_len != sizeof(*rsp)) | |
5158 | return -EPROTO; | |
5159 | ||
5160 | icid = le16_to_cpu(rsp->icid); | |
5161 | ||
ad0ac6ca | 5162 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5163 | |
3fd71a0a MM |
5164 | chan = l2cap_get_chan_by_scid(conn, icid); |
5165 | if (!chan) | |
5166 | return 0; | |
5167 | ||
5168 | __clear_chan_timer(chan); | |
5169 | ||
5170 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5171 | chan->local_amp_id = chan->move_id; | |
5172 | ||
6ed971ca | 5173 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5174 | __release_logical_link(chan); |
5175 | ||
5176 | l2cap_move_done(chan); | |
5177 | } | |
5178 | ||
5179 | l2cap_chan_unlock(chan); | |
5180 | ||
8d5a04a1 MM |
5181 | return 0; |
5182 | } | |
5183 | ||
e2174ca4 | 5184 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 5185 | u16 to_multiplier) |
de73115a CT |
5186 | { |
5187 | u16 max_latency; | |
5188 | ||
5189 | if (min > max || min < 6 || max > 3200) | |
5190 | return -EINVAL; | |
5191 | ||
5192 | if (to_multiplier < 10 || to_multiplier > 3200) | |
5193 | return -EINVAL; | |
5194 | ||
5195 | if (max >= to_multiplier * 8) | |
5196 | return -EINVAL; | |
5197 | ||
5198 | max_latency = (to_multiplier * 8 / max) - 1; | |
5199 | if (latency > 499 || latency > max_latency) | |
5200 | return -EINVAL; | |
5201 | ||
5202 | return 0; | |
5203 | } | |
5204 | ||
5205 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 | 5206 | struct l2cap_cmd_hdr *cmd, |
203e639e | 5207 | u16 cmd_len, u8 *data) |
de73115a CT |
5208 | { |
5209 | struct hci_conn *hcon = conn->hcon; | |
5210 | struct l2cap_conn_param_update_req *req; | |
5211 | struct l2cap_conn_param_update_rsp rsp; | |
203e639e | 5212 | u16 min, max, latency, to_multiplier; |
2ce603eb | 5213 | int err; |
de73115a CT |
5214 | |
5215 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
5216 | return -EINVAL; | |
5217 | ||
de73115a CT |
5218 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5219 | return -EPROTO; | |
5220 | ||
5221 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5222 | min = __le16_to_cpu(req->min); |
5223 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5224 | latency = __le16_to_cpu(req->latency); |
5225 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5226 | ||
5227 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5228 | min, max, latency, to_multiplier); |
de73115a CT |
5229 | |
5230 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
5231 | |
5232 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
5233 | if (err) | |
ac73498c | 5234 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5235 | else |
ac73498c | 5236 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5237 | |
5238 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5239 | sizeof(rsp), &rsp); |
de73115a | 5240 | |
2ce603eb CT |
5241 | if (!err) |
5242 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
5243 | ||
de73115a CT |
5244 | return 0; |
5245 | } | |
5246 | ||
f1496dee JH |
5247 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5248 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5249 | u8 *data) | |
5250 | { | |
5251 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; | |
5252 | u16 dcid, mtu, mps, credits, result; | |
5253 | struct l2cap_chan *chan; | |
5254 | int err; | |
5255 | ||
5256 | if (cmd_len < sizeof(*rsp)) | |
5257 | return -EPROTO; | |
5258 | ||
5259 | dcid = __le16_to_cpu(rsp->dcid); | |
5260 | mtu = __le16_to_cpu(rsp->mtu); | |
5261 | mps = __le16_to_cpu(rsp->mps); | |
5262 | credits = __le16_to_cpu(rsp->credits); | |
5263 | result = __le16_to_cpu(rsp->result); | |
5264 | ||
5265 | if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) | |
5266 | return -EPROTO; | |
5267 | ||
5268 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", | |
5269 | dcid, mtu, mps, credits, result); | |
5270 | ||
5271 | mutex_lock(&conn->chan_lock); | |
5272 | ||
5273 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5274 | if (!chan) { | |
5275 | err = -EBADSLT; | |
5276 | goto unlock; | |
5277 | } | |
5278 | ||
5279 | err = 0; | |
5280 | ||
5281 | l2cap_chan_lock(chan); | |
5282 | ||
5283 | switch (result) { | |
5284 | case L2CAP_CR_SUCCESS: | |
5285 | chan->ident = 0; | |
5286 | chan->dcid = dcid; | |
5287 | chan->omtu = mtu; | |
5288 | chan->remote_mps = mps; | |
5289 | l2cap_chan_ready(chan); | |
5290 | break; | |
5291 | ||
5292 | default: | |
5293 | l2cap_chan_del(chan, ECONNREFUSED); | |
5294 | break; | |
5295 | } | |
5296 | ||
5297 | l2cap_chan_unlock(chan); | |
5298 | ||
5299 | unlock: | |
5300 | mutex_unlock(&conn->chan_lock); | |
5301 | ||
5302 | return err; | |
5303 | } | |
5304 | ||
3300d9a9 | 5305 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5306 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5307 | u8 *data) | |
3300d9a9 CT |
5308 | { |
5309 | int err = 0; | |
5310 | ||
5311 | switch (cmd->code) { | |
5312 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5313 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5314 | break; |
5315 | ||
5316 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5317 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5318 | break; |
5319 | ||
5320 | case L2CAP_CONN_RSP: | |
f5a2598d | 5321 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5322 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5323 | break; |
5324 | ||
5325 | case L2CAP_CONF_REQ: | |
5326 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5327 | break; | |
5328 | ||
5329 | case L2CAP_CONF_RSP: | |
9245e737 | 5330 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5331 | break; |
5332 | ||
5333 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5334 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5335 | break; |
5336 | ||
5337 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5338 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5339 | break; |
5340 | ||
5341 | case L2CAP_ECHO_REQ: | |
5342 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5343 | break; | |
5344 | ||
5345 | case L2CAP_ECHO_RSP: | |
5346 | break; | |
5347 | ||
5348 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5349 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5350 | break; |
5351 | ||
5352 | case L2CAP_INFO_RSP: | |
9245e737 | 5353 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5354 | break; |
5355 | ||
f94ff6ff MM |
5356 | case L2CAP_CREATE_CHAN_REQ: |
5357 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5358 | break; | |
5359 | ||
8d5a04a1 MM |
5360 | case L2CAP_MOVE_CHAN_REQ: |
5361 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5362 | break; | |
5363 | ||
5364 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5365 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5366 | break; |
5367 | ||
5368 | case L2CAP_MOVE_CHAN_CFM: | |
5369 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5370 | break; | |
5371 | ||
5372 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5373 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5374 | break; |
5375 | ||
3300d9a9 CT |
5376 | default: |
5377 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5378 | err = -EINVAL; | |
5379 | break; | |
5380 | } | |
5381 | ||
5382 | return err; | |
5383 | } | |
5384 | ||
5385 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
203e639e JH |
5386 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5387 | u8 *data) | |
3300d9a9 CT |
5388 | { |
5389 | switch (cmd->code) { | |
5390 | case L2CAP_COMMAND_REJ: | |
5391 | return 0; | |
5392 | ||
5393 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
203e639e | 5394 | return l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5395 | |
5396 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
5397 | return 0; | |
5398 | ||
f1496dee JH |
5399 | case L2CAP_LE_CONN_RSP: |
5400 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); | |
5401 | return 0; | |
5402 | ||
3300d9a9 CT |
5403 | default: |
5404 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
5405 | return -EINVAL; | |
5406 | } | |
5407 | } | |
5408 | ||
c5623556 JH |
5409 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5410 | struct sk_buff *skb) | |
5411 | { | |
69c4e4e8 | 5412 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5413 | struct l2cap_cmd_hdr *cmd; |
5414 | u16 len; | |
c5623556 JH |
5415 | int err; |
5416 | ||
69c4e4e8 | 5417 | if (hcon->type != LE_LINK) |
3b166295 | 5418 | goto drop; |
69c4e4e8 | 5419 | |
4f3e219d MH |
5420 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5421 | goto drop; | |
c5623556 | 5422 | |
4f3e219d MH |
5423 | cmd = (void *) skb->data; |
5424 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5425 | |
4f3e219d | 5426 | len = le16_to_cpu(cmd->len); |
c5623556 | 5427 | |
4f3e219d | 5428 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5429 | |
4f3e219d MH |
5430 | if (len != skb->len || !cmd->ident) { |
5431 | BT_DBG("corrupted command"); | |
5432 | goto drop; | |
5433 | } | |
c5623556 | 5434 | |
203e639e | 5435 | err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); |
4f3e219d MH |
5436 | if (err) { |
5437 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5438 | |
4f3e219d | 5439 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5440 | |
a521149a | 5441 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5442 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5443 | sizeof(rej), &rej); | |
c5623556 JH |
5444 | } |
5445 | ||
3b166295 | 5446 | drop: |
c5623556 JH |
5447 | kfree_skb(skb); |
5448 | } | |
5449 | ||
3300d9a9 | 5450 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5451 | struct sk_buff *skb) |
1da177e4 | 5452 | { |
69c4e4e8 | 5453 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5454 | u8 *data = skb->data; |
5455 | int len = skb->len; | |
5456 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5457 | int err; |
1da177e4 LT |
5458 | |
5459 | l2cap_raw_recv(conn, skb); | |
5460 | ||
69c4e4e8 | 5461 | if (hcon->type != ACL_LINK) |
3b166295 | 5462 | goto drop; |
69c4e4e8 | 5463 | |
1da177e4 | 5464 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5465 | u16 cmd_len; |
1da177e4 LT |
5466 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5467 | data += L2CAP_CMD_HDR_SIZE; | |
5468 | len -= L2CAP_CMD_HDR_SIZE; | |
5469 | ||
88219a0f | 5470 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5471 | |
2d792818 GP |
5472 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5473 | cmd.ident); | |
1da177e4 | 5474 | |
88219a0f | 5475 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5476 | BT_DBG("corrupted command"); |
5477 | break; | |
5478 | } | |
5479 | ||
c5623556 | 5480 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5481 | if (err) { |
e2fd318e | 5482 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5483 | |
5484 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5485 | |
a521149a | 5486 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5487 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5488 | sizeof(rej), &rej); | |
1da177e4 LT |
5489 | } |
5490 | ||
88219a0f AV |
5491 | data += cmd_len; |
5492 | len -= cmd_len; | |
1da177e4 LT |
5493 | } |
5494 | ||
3b166295 | 5495 | drop: |
1da177e4 LT |
5496 | kfree_skb(skb); |
5497 | } | |
5498 | ||
47d1ec61 | 5499 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5500 | { |
5501 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5502 | int hdr_size; |
5503 | ||
5504 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5505 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5506 | else | |
5507 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5508 | |
47d1ec61 | 5509 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5510 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5511 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5512 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5513 | ||
5514 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5515 | return -EBADMSG; |
fcc203c3 GP |
5516 | } |
5517 | return 0; | |
5518 | } | |
5519 | ||
6ea00485 | 5520 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5521 | { |
e31f7633 | 5522 | struct l2cap_ctrl control; |
d5392c8f | 5523 | |
e31f7633 | 5524 | BT_DBG("chan %p", chan); |
d5392c8f | 5525 | |
e31f7633 MM |
5526 | memset(&control, 0, sizeof(control)); |
5527 | control.sframe = 1; | |
5528 | control.final = 1; | |
5529 | control.reqseq = chan->buffer_seq; | |
5530 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5531 | |
e2ab4353 | 5532 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5533 | control.super = L2CAP_SUPER_RNR; |
5534 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5535 | } |
5536 | ||
e31f7633 MM |
5537 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5538 | chan->unacked_frames > 0) | |
5539 | __set_retrans_timer(chan); | |
d5392c8f | 5540 | |
e31f7633 | 5541 | /* Send pending iframes */ |
525cd185 | 5542 | l2cap_ertm_send(chan); |
d5392c8f | 5543 | |
e2ab4353 | 5544 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5545 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5546 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5547 | * send it now. | |
5548 | */ | |
5549 | control.super = L2CAP_SUPER_RR; | |
5550 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5551 | } |
5552 | } | |
5553 | ||
2d792818 GP |
5554 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5555 | struct sk_buff **last_frag) | |
18778a63 | 5556 | { |
84084a31 MM |
5557 | /* skb->len reflects data in skb as well as all fragments |
5558 | * skb->data_len reflects only data in fragments | |
5559 | */ | |
5560 | if (!skb_has_frag_list(skb)) | |
5561 | skb_shinfo(skb)->frag_list = new_frag; | |
5562 | ||
5563 | new_frag->next = NULL; | |
5564 | ||
5565 | (*last_frag)->next = new_frag; | |
5566 | *last_frag = new_frag; | |
5567 | ||
5568 | skb->len += new_frag->len; | |
5569 | skb->data_len += new_frag->len; | |
5570 | skb->truesize += new_frag->truesize; | |
5571 | } | |
5572 | ||
4b51dae9 MM |
5573 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5574 | struct l2cap_ctrl *control) | |
84084a31 MM |
5575 | { |
5576 | int err = -EINVAL; | |
18778a63 | 5577 | |
4b51dae9 | 5578 | switch (control->sar) { |
7e0ef6ee | 5579 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5580 | if (chan->sdu) |
5581 | break; | |
18778a63 | 5582 | |
80b98027 | 5583 | err = chan->ops->recv(chan, skb); |
84084a31 | 5584 | break; |
18778a63 | 5585 | |
7e0ef6ee | 5586 | case L2CAP_SAR_START: |
84084a31 MM |
5587 | if (chan->sdu) |
5588 | break; | |
18778a63 | 5589 | |
6f61fd47 | 5590 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5591 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5592 | |
84084a31 MM |
5593 | if (chan->sdu_len > chan->imtu) { |
5594 | err = -EMSGSIZE; | |
5595 | break; | |
5596 | } | |
1890d36b | 5597 | |
84084a31 MM |
5598 | if (skb->len >= chan->sdu_len) |
5599 | break; | |
18778a63 | 5600 | |
84084a31 MM |
5601 | chan->sdu = skb; |
5602 | chan->sdu_last_frag = skb; | |
18778a63 | 5603 | |
84084a31 MM |
5604 | skb = NULL; |
5605 | err = 0; | |
18778a63 GP |
5606 | break; |
5607 | ||
7e0ef6ee | 5608 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5609 | if (!chan->sdu) |
84084a31 | 5610 | break; |
18778a63 | 5611 | |
84084a31 MM |
5612 | append_skb_frag(chan->sdu, skb, |
5613 | &chan->sdu_last_frag); | |
5614 | skb = NULL; | |
18778a63 | 5615 | |
84084a31 MM |
5616 | if (chan->sdu->len >= chan->sdu_len) |
5617 | break; | |
4178ba46 | 5618 | |
84084a31 | 5619 | err = 0; |
18778a63 GP |
5620 | break; |
5621 | ||
7e0ef6ee | 5622 | case L2CAP_SAR_END: |
6f61fd47 | 5623 | if (!chan->sdu) |
84084a31 | 5624 | break; |
18778a63 | 5625 | |
84084a31 MM |
5626 | append_skb_frag(chan->sdu, skb, |
5627 | &chan->sdu_last_frag); | |
5628 | skb = NULL; | |
4178ba46 | 5629 | |
84084a31 MM |
5630 | if (chan->sdu->len != chan->sdu_len) |
5631 | break; | |
18778a63 | 5632 | |
80b98027 | 5633 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5634 | |
84084a31 MM |
5635 | if (!err) { |
5636 | /* Reassembly complete */ | |
5637 | chan->sdu = NULL; | |
5638 | chan->sdu_last_frag = NULL; | |
5639 | chan->sdu_len = 0; | |
1890d36b | 5640 | } |
18778a63 GP |
5641 | break; |
5642 | } | |
5643 | ||
84084a31 MM |
5644 | if (err) { |
5645 | kfree_skb(skb); | |
5646 | kfree_skb(chan->sdu); | |
5647 | chan->sdu = NULL; | |
5648 | chan->sdu_last_frag = NULL; | |
5649 | chan->sdu_len = 0; | |
5650 | } | |
18778a63 | 5651 | |
84084a31 | 5652 | return err; |
18778a63 GP |
5653 | } |
5654 | ||
32b32735 MM |
5655 | static int l2cap_resegment(struct l2cap_chan *chan) |
5656 | { | |
5657 | /* Placeholder */ | |
5658 | return 0; | |
5659 | } | |
5660 | ||
61aa4f5b | 5661 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5662 | { |
61aa4f5b | 5663 | u8 event; |
712132eb | 5664 | |
61aa4f5b MM |
5665 | if (chan->mode != L2CAP_MODE_ERTM) |
5666 | return; | |
712132eb | 5667 | |
61aa4f5b | 5668 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5669 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5670 | } |
5671 | ||
d2a7ac5d MM |
5672 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5673 | { | |
63838725 MM |
5674 | int err = 0; |
5675 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5676 | * until a gap is encountered. | |
5677 | */ | |
5678 | ||
5679 | BT_DBG("chan %p", chan); | |
5680 | ||
5681 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5682 | struct sk_buff *skb; | |
5683 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5684 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5685 | ||
5686 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5687 | ||
5688 | if (!skb) | |
5689 | break; | |
5690 | ||
5691 | skb_unlink(skb, &chan->srej_q); | |
5692 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5693 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5694 | if (err) | |
5695 | break; | |
5696 | } | |
5697 | ||
5698 | if (skb_queue_empty(&chan->srej_q)) { | |
5699 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5700 | l2cap_send_ack(chan); | |
5701 | } | |
5702 | ||
5703 | return err; | |
d2a7ac5d MM |
5704 | } |
5705 | ||
5706 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5707 | struct l2cap_ctrl *control) | |
5708 | { | |
f80842a8 MM |
5709 | struct sk_buff *skb; |
5710 | ||
5711 | BT_DBG("chan %p, control %p", chan, control); | |
5712 | ||
5713 | if (control->reqseq == chan->next_tx_seq) { | |
5714 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5715 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5716 | return; |
5717 | } | |
5718 | ||
5719 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5720 | ||
5721 | if (skb == NULL) { | |
5722 | BT_DBG("Seq %d not available for retransmission", | |
5723 | control->reqseq); | |
5724 | return; | |
5725 | } | |
5726 | ||
5727 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5728 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5729 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5730 | return; |
5731 | } | |
5732 | ||
5733 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5734 | ||
5735 | if (control->poll) { | |
5736 | l2cap_pass_to_tx(chan, control); | |
5737 | ||
5738 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5739 | l2cap_retransmit(chan, control); | |
5740 | l2cap_ertm_send(chan); | |
5741 | ||
5742 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5743 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5744 | chan->srej_save_reqseq = control->reqseq; | |
5745 | } | |
5746 | } else { | |
5747 | l2cap_pass_to_tx_fbit(chan, control); | |
5748 | ||
5749 | if (control->final) { | |
5750 | if (chan->srej_save_reqseq != control->reqseq || | |
5751 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5752 | &chan->conn_state)) | |
5753 | l2cap_retransmit(chan, control); | |
5754 | } else { | |
5755 | l2cap_retransmit(chan, control); | |
5756 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5757 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5758 | chan->srej_save_reqseq = control->reqseq; | |
5759 | } | |
5760 | } | |
5761 | } | |
d2a7ac5d MM |
5762 | } |
5763 | ||
5764 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5765 | struct l2cap_ctrl *control) | |
5766 | { | |
fcd289df MM |
5767 | struct sk_buff *skb; |
5768 | ||
5769 | BT_DBG("chan %p, control %p", chan, control); | |
5770 | ||
5771 | if (control->reqseq == chan->next_tx_seq) { | |
5772 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5773 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5774 | return; |
5775 | } | |
5776 | ||
5777 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5778 | ||
5779 | if (chan->max_tx && skb && | |
5780 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
5781 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5782 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5783 | return; |
5784 | } | |
5785 | ||
5786 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5787 | ||
5788 | l2cap_pass_to_tx(chan, control); | |
5789 | ||
5790 | if (control->final) { | |
5791 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
5792 | l2cap_retransmit_all(chan, control); | |
5793 | } else { | |
5794 | l2cap_retransmit_all(chan, control); | |
5795 | l2cap_ertm_send(chan); | |
5796 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
5797 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
5798 | } | |
d2a7ac5d MM |
5799 | } |
5800 | ||
4b51dae9 MM |
5801 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
5802 | { | |
5803 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
5804 | ||
5805 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
5806 | chan->expected_tx_seq); | |
5807 | ||
5808 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
5809 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 5810 | chan->tx_win) { |
4b51dae9 MM |
5811 | /* See notes below regarding "double poll" and |
5812 | * invalid packets. | |
5813 | */ | |
5814 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5815 | BT_DBG("Invalid/Ignore - after SREJ"); | |
5816 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5817 | } else { | |
5818 | BT_DBG("Invalid - in window after SREJ sent"); | |
5819 | return L2CAP_TXSEQ_INVALID; | |
5820 | } | |
5821 | } | |
5822 | ||
5823 | if (chan->srej_list.head == txseq) { | |
5824 | BT_DBG("Expected SREJ"); | |
5825 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
5826 | } | |
5827 | ||
5828 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
5829 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
5830 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
5831 | } | |
5832 | ||
5833 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
5834 | BT_DBG("Unexpected SREJ - not requested"); | |
5835 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
5836 | } | |
5837 | } | |
5838 | ||
5839 | if (chan->expected_tx_seq == txseq) { | |
5840 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
5841 | chan->tx_win) { | |
5842 | BT_DBG("Invalid - txseq outside tx window"); | |
5843 | return L2CAP_TXSEQ_INVALID; | |
5844 | } else { | |
5845 | BT_DBG("Expected"); | |
5846 | return L2CAP_TXSEQ_EXPECTED; | |
5847 | } | |
5848 | } | |
5849 | ||
5850 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 5851 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
5852 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
5853 | return L2CAP_TXSEQ_DUPLICATE; | |
5854 | } | |
5855 | ||
5856 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
5857 | /* A source of invalid packets is a "double poll" condition, | |
5858 | * where delays cause us to send multiple poll packets. If | |
5859 | * the remote stack receives and processes both polls, | |
5860 | * sequence numbers can wrap around in such a way that a | |
5861 | * resent frame has a sequence number that looks like new data | |
5862 | * with a sequence gap. This would trigger an erroneous SREJ | |
5863 | * request. | |
5864 | * | |
5865 | * Fortunately, this is impossible with a tx window that's | |
5866 | * less than half of the maximum sequence number, which allows | |
5867 | * invalid frames to be safely ignored. | |
5868 | * | |
5869 | * With tx window sizes greater than half of the tx window | |
5870 | * maximum, the frame is invalid and cannot be ignored. This | |
5871 | * causes a disconnect. | |
5872 | */ | |
5873 | ||
5874 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5875 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
5876 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5877 | } else { | |
5878 | BT_DBG("Invalid - txseq outside tx window"); | |
5879 | return L2CAP_TXSEQ_INVALID; | |
5880 | } | |
5881 | } else { | |
5882 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
5883 | return L2CAP_TXSEQ_UNEXPECTED; | |
5884 | } | |
5885 | } | |
5886 | ||
d2a7ac5d MM |
5887 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
5888 | struct l2cap_ctrl *control, | |
5889 | struct sk_buff *skb, u8 event) | |
5890 | { | |
5891 | int err = 0; | |
941247f9 | 5892 | bool skb_in_use = false; |
d2a7ac5d MM |
5893 | |
5894 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5895 | event); | |
5896 | ||
5897 | switch (event) { | |
5898 | case L2CAP_EV_RECV_IFRAME: | |
5899 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
5900 | case L2CAP_TXSEQ_EXPECTED: | |
5901 | l2cap_pass_to_tx(chan, control); | |
5902 | ||
5903 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5904 | BT_DBG("Busy, discarding expected seq %d", | |
5905 | control->txseq); | |
5906 | break; | |
5907 | } | |
5908 | ||
5909 | chan->expected_tx_seq = __next_seq(chan, | |
5910 | control->txseq); | |
5911 | ||
5912 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 5913 | skb_in_use = true; |
d2a7ac5d MM |
5914 | |
5915 | err = l2cap_reassemble_sdu(chan, skb, control); | |
5916 | if (err) | |
5917 | break; | |
5918 | ||
5919 | if (control->final) { | |
5920 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5921 | &chan->conn_state)) { | |
5922 | control->final = 0; | |
5923 | l2cap_retransmit_all(chan, control); | |
5924 | l2cap_ertm_send(chan); | |
5925 | } | |
5926 | } | |
5927 | ||
5928 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
5929 | l2cap_send_ack(chan); | |
5930 | break; | |
5931 | case L2CAP_TXSEQ_UNEXPECTED: | |
5932 | l2cap_pass_to_tx(chan, control); | |
5933 | ||
5934 | /* Can't issue SREJ frames in the local busy state. | |
5935 | * Drop this frame, it will be seen as missing | |
5936 | * when local busy is exited. | |
5937 | */ | |
5938 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5939 | BT_DBG("Busy, discarding unexpected seq %d", | |
5940 | control->txseq); | |
5941 | break; | |
5942 | } | |
5943 | ||
5944 | /* There was a gap in the sequence, so an SREJ | |
5945 | * must be sent for each missing frame. The | |
5946 | * current frame is stored for later use. | |
5947 | */ | |
5948 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 5949 | skb_in_use = true; |
d2a7ac5d MM |
5950 | BT_DBG("Queued %p (queue len %d)", skb, |
5951 | skb_queue_len(&chan->srej_q)); | |
5952 | ||
5953 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5954 | l2cap_seq_list_clear(&chan->srej_list); | |
5955 | l2cap_send_srej(chan, control->txseq); | |
5956 | ||
5957 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
5958 | break; | |
5959 | case L2CAP_TXSEQ_DUPLICATE: | |
5960 | l2cap_pass_to_tx(chan, control); | |
5961 | break; | |
5962 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5963 | break; | |
5964 | case L2CAP_TXSEQ_INVALID: | |
5965 | default: | |
5e4e3972 | 5966 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
5967 | break; |
5968 | } | |
5969 | break; | |
5970 | case L2CAP_EV_RECV_RR: | |
5971 | l2cap_pass_to_tx(chan, control); | |
5972 | if (control->final) { | |
5973 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5974 | ||
e6a3ee6e MM |
5975 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
5976 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
5977 | control->final = 0; |
5978 | l2cap_retransmit_all(chan, control); | |
5979 | } | |
5980 | ||
5981 | l2cap_ertm_send(chan); | |
5982 | } else if (control->poll) { | |
5983 | l2cap_send_i_or_rr_or_rnr(chan); | |
5984 | } else { | |
5985 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5986 | &chan->conn_state) && | |
5987 | chan->unacked_frames) | |
5988 | __set_retrans_timer(chan); | |
5989 | ||
5990 | l2cap_ertm_send(chan); | |
5991 | } | |
5992 | break; | |
5993 | case L2CAP_EV_RECV_RNR: | |
5994 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5995 | l2cap_pass_to_tx(chan, control); | |
5996 | if (control && control->poll) { | |
5997 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5998 | l2cap_send_rr_or_rnr(chan, 0); | |
5999 | } | |
6000 | __clear_retrans_timer(chan); | |
6001 | l2cap_seq_list_clear(&chan->retrans_list); | |
6002 | break; | |
6003 | case L2CAP_EV_RECV_REJ: | |
6004 | l2cap_handle_rej(chan, control); | |
6005 | break; | |
6006 | case L2CAP_EV_RECV_SREJ: | |
6007 | l2cap_handle_srej(chan, control); | |
6008 | break; | |
6009 | default: | |
6010 | break; | |
6011 | } | |
6012 | ||
6013 | if (skb && !skb_in_use) { | |
6014 | BT_DBG("Freeing %p", skb); | |
6015 | kfree_skb(skb); | |
6016 | } | |
6017 | ||
6018 | return err; | |
6019 | } | |
6020 | ||
6021 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
6022 | struct l2cap_ctrl *control, | |
6023 | struct sk_buff *skb, u8 event) | |
6024 | { | |
6025 | int err = 0; | |
6026 | u16 txseq = control->txseq; | |
941247f9 | 6027 | bool skb_in_use = false; |
d2a7ac5d MM |
6028 | |
6029 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6030 | event); | |
6031 | ||
6032 | switch (event) { | |
6033 | case L2CAP_EV_RECV_IFRAME: | |
6034 | switch (l2cap_classify_txseq(chan, txseq)) { | |
6035 | case L2CAP_TXSEQ_EXPECTED: | |
6036 | /* Keep frame for reassembly later */ | |
6037 | l2cap_pass_to_tx(chan, control); | |
6038 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6039 | skb_in_use = true; |
d2a7ac5d MM |
6040 | BT_DBG("Queued %p (queue len %d)", skb, |
6041 | skb_queue_len(&chan->srej_q)); | |
6042 | ||
6043 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
6044 | break; | |
6045 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
6046 | l2cap_seq_list_pop(&chan->srej_list); | |
6047 | ||
6048 | l2cap_pass_to_tx(chan, control); | |
6049 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6050 | skb_in_use = true; |
d2a7ac5d MM |
6051 | BT_DBG("Queued %p (queue len %d)", skb, |
6052 | skb_queue_len(&chan->srej_q)); | |
6053 | ||
6054 | err = l2cap_rx_queued_iframes(chan); | |
6055 | if (err) | |
6056 | break; | |
6057 | ||
6058 | break; | |
6059 | case L2CAP_TXSEQ_UNEXPECTED: | |
6060 | /* Got a frame that can't be reassembled yet. | |
6061 | * Save it for later, and send SREJs to cover | |
6062 | * the missing frames. | |
6063 | */ | |
6064 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6065 | skb_in_use = true; |
d2a7ac5d MM |
6066 | BT_DBG("Queued %p (queue len %d)", skb, |
6067 | skb_queue_len(&chan->srej_q)); | |
6068 | ||
6069 | l2cap_pass_to_tx(chan, control); | |
6070 | l2cap_send_srej(chan, control->txseq); | |
6071 | break; | |
6072 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
6073 | /* This frame was requested with an SREJ, but | |
6074 | * some expected retransmitted frames are | |
6075 | * missing. Request retransmission of missing | |
6076 | * SREJ'd frames. | |
6077 | */ | |
6078 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6079 | skb_in_use = true; |
d2a7ac5d MM |
6080 | BT_DBG("Queued %p (queue len %d)", skb, |
6081 | skb_queue_len(&chan->srej_q)); | |
6082 | ||
6083 | l2cap_pass_to_tx(chan, control); | |
6084 | l2cap_send_srej_list(chan, control->txseq); | |
6085 | break; | |
6086 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
6087 | /* We've already queued this frame. Drop this copy. */ | |
6088 | l2cap_pass_to_tx(chan, control); | |
6089 | break; | |
6090 | case L2CAP_TXSEQ_DUPLICATE: | |
6091 | /* Expecting a later sequence number, so this frame | |
6092 | * was already received. Ignore it completely. | |
6093 | */ | |
6094 | break; | |
6095 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6096 | break; | |
6097 | case L2CAP_TXSEQ_INVALID: | |
6098 | default: | |
5e4e3972 | 6099 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6100 | break; |
6101 | } | |
6102 | break; | |
6103 | case L2CAP_EV_RECV_RR: | |
6104 | l2cap_pass_to_tx(chan, control); | |
6105 | if (control->final) { | |
6106 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6107 | ||
6108 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6109 | &chan->conn_state)) { | |
6110 | control->final = 0; | |
6111 | l2cap_retransmit_all(chan, control); | |
6112 | } | |
6113 | ||
6114 | l2cap_ertm_send(chan); | |
6115 | } else if (control->poll) { | |
6116 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6117 | &chan->conn_state) && | |
6118 | chan->unacked_frames) { | |
6119 | __set_retrans_timer(chan); | |
6120 | } | |
6121 | ||
6122 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6123 | l2cap_send_srej_tail(chan); | |
6124 | } else { | |
6125 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6126 | &chan->conn_state) && | |
6127 | chan->unacked_frames) | |
6128 | __set_retrans_timer(chan); | |
6129 | ||
6130 | l2cap_send_ack(chan); | |
6131 | } | |
6132 | break; | |
6133 | case L2CAP_EV_RECV_RNR: | |
6134 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6135 | l2cap_pass_to_tx(chan, control); | |
6136 | if (control->poll) { | |
6137 | l2cap_send_srej_tail(chan); | |
6138 | } else { | |
6139 | struct l2cap_ctrl rr_control; | |
6140 | memset(&rr_control, 0, sizeof(rr_control)); | |
6141 | rr_control.sframe = 1; | |
6142 | rr_control.super = L2CAP_SUPER_RR; | |
6143 | rr_control.reqseq = chan->buffer_seq; | |
6144 | l2cap_send_sframe(chan, &rr_control); | |
6145 | } | |
6146 | ||
6147 | break; | |
6148 | case L2CAP_EV_RECV_REJ: | |
6149 | l2cap_handle_rej(chan, control); | |
6150 | break; | |
6151 | case L2CAP_EV_RECV_SREJ: | |
6152 | l2cap_handle_srej(chan, control); | |
6153 | break; | |
6154 | } | |
6155 | ||
6156 | if (skb && !skb_in_use) { | |
6157 | BT_DBG("Freeing %p", skb); | |
6158 | kfree_skb(skb); | |
6159 | } | |
6160 | ||
6161 | return err; | |
6162 | } | |
6163 | ||
32b32735 MM |
6164 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6165 | { | |
6166 | BT_DBG("chan %p", chan); | |
6167 | ||
6168 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6169 | ||
6170 | if (chan->hs_hcon) | |
6171 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6172 | else | |
6173 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6174 | ||
6175 | return l2cap_resegment(chan); | |
6176 | } | |
6177 | ||
6178 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6179 | struct l2cap_ctrl *control, | |
6180 | struct sk_buff *skb, u8 event) | |
6181 | { | |
6182 | int err; | |
6183 | ||
6184 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6185 | event); | |
6186 | ||
6187 | if (!control->poll) | |
6188 | return -EPROTO; | |
6189 | ||
6190 | l2cap_process_reqseq(chan, control->reqseq); | |
6191 | ||
6192 | if (!skb_queue_empty(&chan->tx_q)) | |
6193 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6194 | else | |
6195 | chan->tx_send_head = NULL; | |
6196 | ||
6197 | /* Rewind next_tx_seq to the point expected | |
6198 | * by the receiver. | |
6199 | */ | |
6200 | chan->next_tx_seq = control->reqseq; | |
6201 | chan->unacked_frames = 0; | |
6202 | ||
6203 | err = l2cap_finish_move(chan); | |
6204 | if (err) | |
6205 | return err; | |
6206 | ||
6207 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6208 | l2cap_send_i_or_rr_or_rnr(chan); | |
6209 | ||
6210 | if (event == L2CAP_EV_RECV_IFRAME) | |
6211 | return -EPROTO; | |
6212 | ||
6213 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6214 | } | |
6215 | ||
6216 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6217 | struct l2cap_ctrl *control, | |
6218 | struct sk_buff *skb, u8 event) | |
6219 | { | |
6220 | int err; | |
6221 | ||
6222 | if (!control->final) | |
6223 | return -EPROTO; | |
6224 | ||
6225 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6226 | ||
6227 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6228 | l2cap_process_reqseq(chan, control->reqseq); | |
6229 | ||
6230 | if (!skb_queue_empty(&chan->tx_q)) | |
6231 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6232 | else | |
6233 | chan->tx_send_head = NULL; | |
6234 | ||
6235 | /* Rewind next_tx_seq to the point expected | |
6236 | * by the receiver. | |
6237 | */ | |
6238 | chan->next_tx_seq = control->reqseq; | |
6239 | chan->unacked_frames = 0; | |
6240 | ||
6241 | if (chan->hs_hcon) | |
6242 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6243 | else | |
6244 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6245 | ||
6246 | err = l2cap_resegment(chan); | |
6247 | ||
6248 | if (!err) | |
6249 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6250 | ||
6251 | return err; | |
6252 | } | |
6253 | ||
d2a7ac5d MM |
6254 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6255 | { | |
6256 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6257 | u16 unacked; | |
6258 | ||
6259 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6260 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6261 | } | |
6262 | ||
cec8ab6e MM |
6263 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6264 | struct sk_buff *skb, u8 event) | |
218bb9df | 6265 | { |
d2a7ac5d MM |
6266 | int err = 0; |
6267 | ||
6268 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6269 | control, skb, event, chan->rx_state); | |
6270 | ||
6271 | if (__valid_reqseq(chan, control->reqseq)) { | |
6272 | switch (chan->rx_state) { | |
6273 | case L2CAP_RX_STATE_RECV: | |
6274 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6275 | break; | |
6276 | case L2CAP_RX_STATE_SREJ_SENT: | |
6277 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6278 | event); | |
6279 | break; | |
32b32735 MM |
6280 | case L2CAP_RX_STATE_WAIT_P: |
6281 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6282 | break; | |
6283 | case L2CAP_RX_STATE_WAIT_F: | |
6284 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6285 | break; | |
d2a7ac5d MM |
6286 | default: |
6287 | /* shut it down */ | |
6288 | break; | |
6289 | } | |
6290 | } else { | |
6291 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6292 | control->reqseq, chan->next_tx_seq, | |
6293 | chan->expected_ack_seq); | |
5e4e3972 | 6294 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6295 | } |
6296 | ||
6297 | return err; | |
cec8ab6e MM |
6298 | } |
6299 | ||
6300 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6301 | struct sk_buff *skb) | |
6302 | { | |
4b51dae9 MM |
6303 | int err = 0; |
6304 | ||
6305 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6306 | chan->rx_state); | |
6307 | ||
6308 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6309 | L2CAP_TXSEQ_EXPECTED) { | |
6310 | l2cap_pass_to_tx(chan, control); | |
6311 | ||
6312 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6313 | __next_seq(chan, chan->buffer_seq)); | |
6314 | ||
6315 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6316 | ||
6317 | l2cap_reassemble_sdu(chan, skb, control); | |
6318 | } else { | |
6319 | if (chan->sdu) { | |
6320 | kfree_skb(chan->sdu); | |
6321 | chan->sdu = NULL; | |
6322 | } | |
6323 | chan->sdu_last_frag = NULL; | |
6324 | chan->sdu_len = 0; | |
6325 | ||
6326 | if (skb) { | |
6327 | BT_DBG("Freeing %p", skb); | |
6328 | kfree_skb(skb); | |
6329 | } | |
6330 | } | |
6331 | ||
6332 | chan->last_acked_seq = control->txseq; | |
6333 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6334 | ||
6335 | return err; | |
cec8ab6e MM |
6336 | } |
6337 | ||
6338 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6339 | { | |
6340 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
6341 | u16 len; | |
6342 | u8 event; | |
218bb9df | 6343 | |
b76bbd66 MM |
6344 | __unpack_control(chan, skb); |
6345 | ||
218bb9df GP |
6346 | len = skb->len; |
6347 | ||
6348 | /* | |
6349 | * We can just drop the corrupted I-frame here. | |
6350 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6351 | * procedures and ask for retransmission. |
218bb9df | 6352 | */ |
47d1ec61 | 6353 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6354 | goto drop; |
6355 | ||
cec8ab6e | 6356 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6357 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6358 | |
47d1ec61 | 6359 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6360 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6361 | |
47d1ec61 | 6362 | if (len > chan->mps) { |
5e4e3972 | 6363 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6364 | goto drop; |
6365 | } | |
6366 | ||
cec8ab6e MM |
6367 | if (!control->sframe) { |
6368 | int err; | |
218bb9df | 6369 | |
cec8ab6e MM |
6370 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6371 | control->sar, control->reqseq, control->final, | |
6372 | control->txseq); | |
218bb9df | 6373 | |
cec8ab6e MM |
6374 | /* Validate F-bit - F=0 always valid, F=1 only |
6375 | * valid in TX WAIT_F | |
6376 | */ | |
6377 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6378 | goto drop; |
cec8ab6e MM |
6379 | |
6380 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6381 | event = L2CAP_EV_RECV_IFRAME; | |
6382 | err = l2cap_rx(chan, control, skb, event); | |
6383 | } else { | |
6384 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6385 | } |
6386 | ||
cec8ab6e | 6387 | if (err) |
5e4e3972 | 6388 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6389 | } else { |
cec8ab6e MM |
6390 | const u8 rx_func_to_event[4] = { |
6391 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6392 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6393 | }; | |
6394 | ||
6395 | /* Only I-frames are expected in streaming mode */ | |
6396 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6397 | goto drop; | |
6398 | ||
6399 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6400 | control->reqseq, control->final, control->poll, | |
6401 | control->super); | |
6402 | ||
218bb9df | 6403 | if (len != 0) { |
1bb166e6 | 6404 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6405 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6406 | goto drop; |
6407 | } | |
6408 | ||
cec8ab6e MM |
6409 | /* Validate F and P bits */ |
6410 | if (control->final && (control->poll || | |
6411 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6412 | goto drop; | |
6413 | ||
6414 | event = rx_func_to_event[control->super]; | |
6415 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6416 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6417 | } |
6418 | ||
6419 | return 0; | |
6420 | ||
6421 | drop: | |
6422 | kfree_skb(skb); | |
6423 | return 0; | |
6424 | } | |
6425 | ||
13ca56e0 AE |
6426 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6427 | struct sk_buff *skb) | |
1da177e4 | 6428 | { |
48454079 | 6429 | struct l2cap_chan *chan; |
1da177e4 | 6430 | |
baa7e1fa | 6431 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6432 | if (!chan) { |
97e8e89d AE |
6433 | if (cid == L2CAP_CID_A2MP) { |
6434 | chan = a2mp_channel_create(conn, skb); | |
6435 | if (!chan) { | |
6436 | kfree_skb(skb); | |
13ca56e0 | 6437 | return; |
97e8e89d AE |
6438 | } |
6439 | ||
6440 | l2cap_chan_lock(chan); | |
6441 | } else { | |
6442 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6443 | /* Drop packet and return */ | |
6444 | kfree_skb(skb); | |
13ca56e0 | 6445 | return; |
97e8e89d | 6446 | } |
1da177e4 LT |
6447 | } |
6448 | ||
49208c9c | 6449 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6450 | |
89bc500e | 6451 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6452 | goto drop; |
6453 | ||
0c1bc5c6 | 6454 | switch (chan->mode) { |
1c2acffb GP |
6455 | case L2CAP_MODE_BASIC: |
6456 | /* If socket recv buffers overflows we drop data here | |
6457 | * which is *bad* because L2CAP has to be reliable. | |
6458 | * But we don't have any other choice. L2CAP doesn't | |
6459 | * provide flow control mechanism. */ | |
1da177e4 | 6460 | |
0c1bc5c6 | 6461 | if (chan->imtu < skb->len) |
1c2acffb | 6462 | goto drop; |
1da177e4 | 6463 | |
80b98027 | 6464 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6465 | goto done; |
6466 | break; | |
6467 | ||
6468 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6469 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6470 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6471 | goto done; |
6472 | ||
1c2acffb | 6473 | default: |
0c1bc5c6 | 6474 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6475 | break; |
6476 | } | |
1da177e4 LT |
6477 | |
6478 | drop: | |
6479 | kfree_skb(skb); | |
6480 | ||
6481 | done: | |
6be36555 | 6482 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6483 | } |
6484 | ||
84104b24 AE |
6485 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6486 | struct sk_buff *skb) | |
1da177e4 | 6487 | { |
ae4fd2d3 | 6488 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6489 | struct l2cap_chan *chan; |
1da177e4 | 6490 | |
ae4fd2d3 MH |
6491 | if (hcon->type != ACL_LINK) |
6492 | goto drop; | |
6493 | ||
bf20fd4e JH |
6494 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, |
6495 | ACL_LINK); | |
23691d75 | 6496 | if (!chan) |
1da177e4 LT |
6497 | goto drop; |
6498 | ||
5b4cedaa | 6499 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6500 | |
89bc500e | 6501 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6502 | goto drop; |
6503 | ||
e13e21dc | 6504 | if (chan->imtu < skb->len) |
1da177e4 LT |
6505 | goto drop; |
6506 | ||
2edf870d | 6507 | /* Store remote BD_ADDR and PSM for msg_name */ |
06ae3314 | 6508 | bacpy(&bt_cb(skb)->bdaddr, &hcon->dst); |
2edf870d MH |
6509 | bt_cb(skb)->psm = psm; |
6510 | ||
80b98027 | 6511 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 6512 | return; |
1da177e4 LT |
6513 | |
6514 | drop: | |
6515 | kfree_skb(skb); | |
1da177e4 LT |
6516 | } |
6517 | ||
72f78356 | 6518 | static void l2cap_att_channel(struct l2cap_conn *conn, |
6810fca7 | 6519 | struct sk_buff *skb) |
9f69bda6 | 6520 | { |
b99707d7 | 6521 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6522 | struct l2cap_chan *chan; |
9f69bda6 | 6523 | |
b99707d7 MH |
6524 | if (hcon->type != LE_LINK) |
6525 | goto drop; | |
6526 | ||
af1c0134 | 6527 | chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT, |
06ae3314 | 6528 | &hcon->src, &hcon->dst); |
23691d75 | 6529 | if (!chan) |
9f69bda6 GP |
6530 | goto drop; |
6531 | ||
5b4cedaa | 6532 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 6533 | |
cc8dba2b MH |
6534 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type)) |
6535 | goto drop; | |
6536 | ||
e13e21dc | 6537 | if (chan->imtu < skb->len) |
9f69bda6 GP |
6538 | goto drop; |
6539 | ||
80b98027 | 6540 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 6541 | return; |
9f69bda6 GP |
6542 | |
6543 | drop: | |
6544 | kfree_skb(skb); | |
9f69bda6 GP |
6545 | } |
6546 | ||
1da177e4 LT |
6547 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
6548 | { | |
6549 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
6550 | u16 cid, len; |
6551 | __le16 psm; | |
1da177e4 LT |
6552 | |
6553 | skb_pull(skb, L2CAP_HDR_SIZE); | |
6554 | cid = __le16_to_cpu(lh->cid); | |
6555 | len = __le16_to_cpu(lh->len); | |
6556 | ||
1c2acffb GP |
6557 | if (len != skb->len) { |
6558 | kfree_skb(skb); | |
6559 | return; | |
6560 | } | |
6561 | ||
1da177e4 LT |
6562 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6563 | ||
6564 | switch (cid) { | |
8db4dc46 | 6565 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6566 | l2cap_sig_channel(conn, skb); |
6567 | break; | |
6568 | ||
8db4dc46 | 6569 | case L2CAP_CID_CONN_LESS: |
097db76c | 6570 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6571 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6572 | l2cap_conless_channel(conn, psm, skb); |
6573 | break; | |
6574 | ||
073d1cf3 | 6575 | case L2CAP_CID_ATT: |
72f78356 | 6576 | l2cap_att_channel(conn, skb); |
9f69bda6 GP |
6577 | break; |
6578 | ||
a2877629 MH |
6579 | case L2CAP_CID_LE_SIGNALING: |
6580 | l2cap_le_sig_channel(conn, skb); | |
6581 | break; | |
6582 | ||
b501d6a1 AB |
6583 | case L2CAP_CID_SMP: |
6584 | if (smp_sig_channel(conn, skb)) | |
6585 | l2cap_conn_del(conn->hcon, EACCES); | |
6586 | break; | |
6587 | ||
1da177e4 LT |
6588 | default: |
6589 | l2cap_data_channel(conn, cid, skb); | |
6590 | break; | |
6591 | } | |
6592 | } | |
6593 | ||
6594 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
6595 | ||
686ebf28 | 6596 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
6597 | { |
6598 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 6599 | struct l2cap_chan *c; |
1da177e4 | 6600 | |
6ed93dc6 | 6601 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
6602 | |
6603 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
6604 | read_lock(&chan_list_lock); |
6605 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 6606 | if (c->state != BT_LISTEN) |
1da177e4 LT |
6607 | continue; |
6608 | ||
7eafc59e | 6609 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 6610 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 6611 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 6612 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 6613 | exact++; |
7eafc59e | 6614 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 6615 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 6616 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
6617 | lm2 |= HCI_LM_MASTER; |
6618 | } | |
1da177e4 | 6619 | } |
23691d75 | 6620 | read_unlock(&chan_list_lock); |
1da177e4 LT |
6621 | |
6622 | return exact ? lm1 : lm2; | |
6623 | } | |
6624 | ||
9e664631 | 6625 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 6626 | { |
0139418c MH |
6627 | struct l2cap_conn *conn; |
6628 | ||
6ed93dc6 | 6629 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 6630 | |
1da177e4 | 6631 | if (!status) { |
baf43251 | 6632 | conn = l2cap_conn_add(hcon); |
1da177e4 LT |
6633 | if (conn) |
6634 | l2cap_conn_ready(conn); | |
ba6fc317 | 6635 | } else { |
e175072f | 6636 | l2cap_conn_del(hcon, bt_to_errno(status)); |
ba6fc317 | 6637 | } |
1da177e4 LT |
6638 | } |
6639 | ||
686ebf28 | 6640 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
6641 | { |
6642 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6643 | ||
6644 | BT_DBG("hcon %p", hcon); | |
6645 | ||
686ebf28 | 6646 | if (!conn) |
9f5a0d7b | 6647 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
6648 | return conn->disc_reason; |
6649 | } | |
6650 | ||
9e664631 | 6651 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
6652 | { |
6653 | BT_DBG("hcon %p reason %d", hcon, reason); | |
6654 | ||
e175072f | 6655 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
6656 | } |
6657 | ||
4343478f | 6658 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 6659 | { |
715ec005 | 6660 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
6661 | return; |
6662 | ||
f62e4323 | 6663 | if (encrypt == 0x00) { |
4343478f | 6664 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 6665 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 6666 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 6667 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 6668 | } else { |
4343478f | 6669 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 6670 | __clear_chan_timer(chan); |
f62e4323 MH |
6671 | } |
6672 | } | |
6673 | ||
686ebf28 | 6674 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 6675 | { |
0139418c | 6676 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 6677 | struct l2cap_chan *chan; |
1da177e4 | 6678 | |
0139418c | 6679 | if (!conn) |
1da177e4 | 6680 | return 0; |
0139418c | 6681 | |
89d8b407 | 6682 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 6683 | |
160dc6ac | 6684 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
6685 | if (!status && encrypt) |
6686 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 6687 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
6688 | } |
6689 | ||
3df91ea2 | 6690 | mutex_lock(&conn->chan_lock); |
1da177e4 | 6691 | |
3df91ea2 | 6692 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 6693 | l2cap_chan_lock(chan); |
1da177e4 | 6694 | |
89d8b407 AE |
6695 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
6696 | state_to_string(chan->state)); | |
f1cb9af5 | 6697 | |
78eb2f98 AE |
6698 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
6699 | l2cap_chan_unlock(chan); | |
6700 | continue; | |
6701 | } | |
6702 | ||
073d1cf3 | 6703 | if (chan->scid == L2CAP_CID_ATT) { |
f1cb9af5 VCG |
6704 | if (!status && encrypt) { |
6705 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 6706 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
6707 | } |
6708 | ||
6be36555 | 6709 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
6710 | continue; |
6711 | } | |
6712 | ||
96eff46e | 6713 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 6714 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
6715 | continue; |
6716 | } | |
6717 | ||
89bc500e | 6718 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 6719 | chan->state == BT_CONFIG)) { |
d97c899b | 6720 | chan->ops->resume(chan); |
4343478f | 6721 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 6722 | l2cap_chan_unlock(chan); |
9719f8af MH |
6723 | continue; |
6724 | } | |
6725 | ||
89bc500e | 6726 | if (chan->state == BT_CONNECT) { |
6d3c15da | 6727 | if (!status) |
93c3e8f5 | 6728 | l2cap_start_connection(chan); |
6d3c15da | 6729 | else |
ba13ccd9 | 6730 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
89bc500e | 6731 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 6732 | struct l2cap_conn_rsp rsp; |
df3c3931 | 6733 | __u16 res, stat; |
1da177e4 | 6734 | |
b1235d79 | 6735 | if (!status) { |
bdc25783 | 6736 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
6737 | res = L2CAP_CR_PEND; |
6738 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 6739 | chan->ops->defer(chan); |
df3c3931 | 6740 | } else { |
acdcabf5 | 6741 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
6742 | res = L2CAP_CR_SUCCESS; |
6743 | stat = L2CAP_CS_NO_INFO; | |
6744 | } | |
b1235d79 | 6745 | } else { |
acdcabf5 | 6746 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 6747 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
6748 | res = L2CAP_CR_SEC_BLOCK; |
6749 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
6750 | } |
6751 | ||
fe4128e0 GP |
6752 | rsp.scid = cpu_to_le16(chan->dcid); |
6753 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
6754 | rsp.result = cpu_to_le16(res); |
6755 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 6756 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 6757 | sizeof(rsp), &rsp); |
2d369359 MM |
6758 | |
6759 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
6760 | res == L2CAP_CR_SUCCESS) { | |
6761 | char buf[128]; | |
6762 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
6763 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
6764 | L2CAP_CONF_REQ, | |
6765 | l2cap_build_conf_req(chan, buf), | |
6766 | buf); | |
6767 | chan->num_conf_req++; | |
6768 | } | |
b1235d79 | 6769 | } |
1da177e4 | 6770 | |
6be36555 | 6771 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6772 | } |
6773 | ||
3df91ea2 | 6774 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 6775 | |
1da177e4 LT |
6776 | return 0; |
6777 | } | |
6778 | ||
686ebf28 | 6779 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
6780 | { |
6781 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
6782 | struct l2cap_hdr *hdr; |
6783 | int len; | |
1da177e4 | 6784 | |
1d13a254 AE |
6785 | /* For AMP controller do not create l2cap conn */ |
6786 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
6787 | goto drop; | |
1da177e4 | 6788 | |
5a08ecce | 6789 | if (!conn) |
baf43251 | 6790 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
6791 | |
6792 | if (!conn) | |
1da177e4 LT |
6793 | goto drop; |
6794 | ||
6795 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
6796 | ||
d73a0988 AE |
6797 | switch (flags) { |
6798 | case ACL_START: | |
6799 | case ACL_START_NO_FLUSH: | |
6800 | case ACL_COMPLETE: | |
1da177e4 LT |
6801 | if (conn->rx_len) { |
6802 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
6803 | kfree_skb(conn->rx_skb); | |
6804 | conn->rx_skb = NULL; | |
6805 | conn->rx_len = 0; | |
6806 | l2cap_conn_unreliable(conn, ECOMM); | |
6807 | } | |
6808 | ||
aae7fe22 AE |
6809 | /* Start fragment always begin with Basic L2CAP header */ |
6810 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
6811 | BT_ERR("Frame is too short (len %d)", skb->len); |
6812 | l2cap_conn_unreliable(conn, ECOMM); | |
6813 | goto drop; | |
6814 | } | |
6815 | ||
6816 | hdr = (struct l2cap_hdr *) skb->data; | |
6817 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
6818 | ||
6819 | if (len == skb->len) { | |
6820 | /* Complete frame received */ | |
6821 | l2cap_recv_frame(conn, skb); | |
6822 | return 0; | |
6823 | } | |
6824 | ||
6825 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
6826 | ||
6827 | if (skb->len > len) { | |
6828 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 6829 | skb->len, len); |
1da177e4 LT |
6830 | l2cap_conn_unreliable(conn, ECOMM); |
6831 | goto drop; | |
6832 | } | |
6833 | ||
6834 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 6835 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 6836 | if (!conn->rx_skb) |
1da177e4 LT |
6837 | goto drop; |
6838 | ||
d626f62b | 6839 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6840 | skb->len); |
1da177e4 | 6841 | conn->rx_len = len - skb->len; |
d73a0988 AE |
6842 | break; |
6843 | ||
6844 | case ACL_CONT: | |
1da177e4 LT |
6845 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
6846 | ||
6847 | if (!conn->rx_len) { | |
6848 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
6849 | l2cap_conn_unreliable(conn, ECOMM); | |
6850 | goto drop; | |
6851 | } | |
6852 | ||
6853 | if (skb->len > conn->rx_len) { | |
6854 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 6855 | skb->len, conn->rx_len); |
1da177e4 LT |
6856 | kfree_skb(conn->rx_skb); |
6857 | conn->rx_skb = NULL; | |
6858 | conn->rx_len = 0; | |
6859 | l2cap_conn_unreliable(conn, ECOMM); | |
6860 | goto drop; | |
6861 | } | |
6862 | ||
d626f62b | 6863 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6864 | skb->len); |
1da177e4 LT |
6865 | conn->rx_len -= skb->len; |
6866 | ||
6867 | if (!conn->rx_len) { | |
c4e5bafa JH |
6868 | /* Complete frame received. l2cap_recv_frame |
6869 | * takes ownership of the skb so set the global | |
6870 | * rx_skb pointer to NULL first. | |
6871 | */ | |
6872 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 6873 | conn->rx_skb = NULL; |
c4e5bafa | 6874 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 6875 | } |
d73a0988 | 6876 | break; |
1da177e4 LT |
6877 | } |
6878 | ||
6879 | drop: | |
6880 | kfree_skb(skb); | |
6881 | return 0; | |
6882 | } | |
6883 | ||
aef7d97c | 6884 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 6885 | { |
23691d75 | 6886 | struct l2cap_chan *c; |
1da177e4 | 6887 | |
333055f2 | 6888 | read_lock(&chan_list_lock); |
1da177e4 | 6889 | |
23691d75 | 6890 | list_for_each_entry(c, &chan_list, global_l) { |
fcb73338 | 6891 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7eafc59e | 6892 | &c->src, &c->dst, |
fcb73338 AE |
6893 | c->state, __le16_to_cpu(c->psm), |
6894 | c->scid, c->dcid, c->imtu, c->omtu, | |
6895 | c->sec_level, c->mode); | |
61e1b4b7 | 6896 | } |
1da177e4 | 6897 | |
333055f2 | 6898 | read_unlock(&chan_list_lock); |
1da177e4 | 6899 | |
aef7d97c | 6900 | return 0; |
1da177e4 LT |
6901 | } |
6902 | ||
aef7d97c MH |
6903 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
6904 | { | |
6905 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
6906 | } | |
6907 | ||
6908 | static const struct file_operations l2cap_debugfs_fops = { | |
6909 | .open = l2cap_debugfs_open, | |
6910 | .read = seq_read, | |
6911 | .llseek = seq_lseek, | |
6912 | .release = single_release, | |
6913 | }; | |
6914 | ||
6915 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 6916 | |
64274518 | 6917 | int __init l2cap_init(void) |
1da177e4 LT |
6918 | { |
6919 | int err; | |
be9d1227 | 6920 | |
bb58f747 | 6921 | err = l2cap_init_sockets(); |
1da177e4 LT |
6922 | if (err < 0) |
6923 | return err; | |
6924 | ||
1120e4bf MH |
6925 | if (IS_ERR_OR_NULL(bt_debugfs)) |
6926 | return 0; | |
6927 | ||
6928 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
6929 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 6930 | |
1da177e4 | 6931 | return 0; |
1da177e4 LT |
6932 | } |
6933 | ||
64274518 | 6934 | void l2cap_exit(void) |
1da177e4 | 6935 | { |
aef7d97c | 6936 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 6937 | l2cap_cleanup_sockets(); |
1da177e4 LT |
6938 | } |
6939 | ||
d1c4a17d GP |
6940 | module_param(disable_ertm, bool, 0644); |
6941 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |