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 | ||
0f852724 | 620 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
621 | { |
622 | struct l2cap_conn *conn = chan->conn; | |
4519de9a | 623 | |
7eafc59e | 624 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
4519de9a | 625 | |
89bc500e | 626 | switch (chan->state) { |
4519de9a | 627 | case BT_LISTEN: |
b699ec0d | 628 | chan->ops->teardown(chan, 0); |
4519de9a GP |
629 | break; |
630 | ||
631 | case BT_CONNECTED: | |
632 | case BT_CONFIG: | |
715ec005 | 633 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 634 | conn->hcon->type == ACL_LINK) { |
8d836d71 | 635 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
5e4e3972 | 636 | l2cap_send_disconn_req(chan, reason); |
4519de9a GP |
637 | } else |
638 | l2cap_chan_del(chan, reason); | |
639 | break; | |
640 | ||
641 | case BT_CONNECT2: | |
715ec005 | 642 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
2d792818 | 643 | conn->hcon->type == ACL_LINK) { |
4519de9a GP |
644 | struct l2cap_conn_rsp rsp; |
645 | __u16 result; | |
646 | ||
bdc25783 | 647 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) |
4519de9a GP |
648 | result = L2CAP_CR_SEC_BLOCK; |
649 | else | |
650 | result = L2CAP_CR_BAD_PSM; | |
bdc25783 | 651 | |
89bc500e | 652 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
653 | |
654 | rsp.scid = cpu_to_le16(chan->dcid); | |
655 | rsp.dcid = cpu_to_le16(chan->scid); | |
656 | rsp.result = cpu_to_le16(result); | |
ac73498c | 657 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); |
4519de9a | 658 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 659 | sizeof(rsp), &rsp); |
4519de9a GP |
660 | } |
661 | ||
662 | l2cap_chan_del(chan, reason); | |
663 | break; | |
664 | ||
665 | case BT_CONNECT: | |
666 | case BT_DISCONN: | |
667 | l2cap_chan_del(chan, reason); | |
668 | break; | |
669 | ||
670 | default: | |
b699ec0d | 671 | chan->ops->teardown(chan, 0); |
4519de9a GP |
672 | break; |
673 | } | |
674 | } | |
675 | ||
4343478f | 676 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 677 | { |
6a974b50 MH |
678 | switch (chan->chan_type) { |
679 | case L2CAP_CHAN_RAW: | |
4343478f | 680 | switch (chan->sec_level) { |
8556edd3 JH |
681 | case BT_SECURITY_HIGH: |
682 | return HCI_AT_DEDICATED_BONDING_MITM; | |
683 | case BT_SECURITY_MEDIUM: | |
684 | return HCI_AT_DEDICATED_BONDING; | |
685 | default: | |
686 | return HCI_AT_NO_BONDING; | |
687 | } | |
6a974b50 | 688 | break; |
3124b843 MH |
689 | case L2CAP_CHAN_CONN_LESS: |
690 | if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) { | |
691 | if (chan->sec_level == BT_SECURITY_LOW) | |
692 | chan->sec_level = BT_SECURITY_SDP; | |
693 | } | |
694 | if (chan->sec_level == BT_SECURITY_HIGH) | |
695 | return HCI_AT_NO_BONDING_MITM; | |
696 | else | |
697 | return HCI_AT_NO_BONDING; | |
698 | break; | |
6a974b50 MH |
699 | case L2CAP_CHAN_CONN_ORIENTED: |
700 | if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { | |
701 | if (chan->sec_level == BT_SECURITY_LOW) | |
702 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 703 | |
6a974b50 MH |
704 | if (chan->sec_level == BT_SECURITY_HIGH) |
705 | return HCI_AT_NO_BONDING_MITM; | |
706 | else | |
707 | return HCI_AT_NO_BONDING; | |
708 | } | |
709 | /* fall through */ | |
710 | default: | |
4343478f | 711 | switch (chan->sec_level) { |
00ae4af9 | 712 | case BT_SECURITY_HIGH: |
8556edd3 | 713 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 714 | case BT_SECURITY_MEDIUM: |
8556edd3 | 715 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 716 | default: |
8556edd3 | 717 | return HCI_AT_NO_BONDING; |
00ae4af9 | 718 | } |
6a974b50 | 719 | break; |
0684e5f9 | 720 | } |
8556edd3 JH |
721 | } |
722 | ||
723 | /* Service level security */ | |
d45fc423 | 724 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 725 | { |
8c1d787b | 726 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
727 | __u8 auth_type; |
728 | ||
4343478f | 729 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 730 | |
4343478f | 731 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
732 | } |
733 | ||
b5ad8b7f | 734 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
735 | { |
736 | u8 id; | |
737 | ||
738 | /* Get next available identificator. | |
739 | * 1 - 128 are used by kernel. | |
740 | * 129 - 199 are reserved. | |
741 | * 200 - 254 are used by utilities like l2ping, etc. | |
742 | */ | |
743 | ||
333055f2 | 744 | spin_lock(&conn->lock); |
4e8402a3 MH |
745 | |
746 | if (++conn->tx_ident > 128) | |
747 | conn->tx_ident = 1; | |
748 | ||
749 | id = conn->tx_ident; | |
750 | ||
333055f2 | 751 | spin_unlock(&conn->lock); |
4e8402a3 MH |
752 | |
753 | return id; | |
754 | } | |
755 | ||
2d792818 GP |
756 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
757 | void *data) | |
4e8402a3 MH |
758 | { |
759 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 760 | u8 flags; |
4e8402a3 MH |
761 | |
762 | BT_DBG("code 0x%2.2x", code); | |
763 | ||
764 | if (!skb) | |
9a9c6a34 | 765 | return; |
4e8402a3 | 766 | |
e702112f AE |
767 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
768 | flags = ACL_START_NO_FLUSH; | |
769 | else | |
770 | flags = ACL_START; | |
771 | ||
14b12d0b | 772 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 773 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 774 | |
73d80deb LAD |
775 | hci_send_acl(conn->hchan, skb, flags); |
776 | } | |
777 | ||
02b0fbb9 MM |
778 | static bool __chan_is_moving(struct l2cap_chan *chan) |
779 | { | |
780 | return chan->move_state != L2CAP_MOVE_STABLE && | |
781 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
782 | } | |
783 | ||
73d80deb LAD |
784 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
785 | { | |
786 | struct hci_conn *hcon = chan->conn->hcon; | |
787 | u16 flags; | |
788 | ||
789 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 790 | skb->priority); |
73d80deb | 791 | |
d5f8a75d MM |
792 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
793 | if (chan->hs_hchan) | |
794 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
795 | else | |
796 | kfree_skb(skb); | |
797 | ||
798 | return; | |
799 | } | |
800 | ||
73d80deb | 801 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
2d792818 | 802 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
803 | flags = ACL_START_NO_FLUSH; |
804 | else | |
805 | flags = ACL_START; | |
14b12d0b | 806 | |
73d80deb LAD |
807 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
808 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
809 | } |
810 | ||
b76bbd66 MM |
811 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
812 | { | |
813 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
814 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
815 | ||
816 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
817 | /* S-Frame */ | |
818 | control->sframe = 1; | |
819 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
820 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
821 | ||
822 | control->sar = 0; | |
823 | control->txseq = 0; | |
824 | } else { | |
825 | /* I-Frame */ | |
826 | control->sframe = 0; | |
827 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
828 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
829 | ||
830 | control->poll = 0; | |
831 | control->super = 0; | |
832 | } | |
833 | } | |
834 | ||
b76bbd66 MM |
835 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
836 | { | |
837 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
838 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
839 | ||
840 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
841 | /* S-Frame */ | |
842 | control->sframe = 1; | |
843 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
844 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
845 | ||
846 | control->sar = 0; | |
847 | control->txseq = 0; | |
848 | } else { | |
849 | /* I-Frame */ | |
850 | control->sframe = 0; | |
851 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
852 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
853 | ||
854 | control->poll = 0; | |
855 | control->super = 0; | |
856 | } | |
857 | } | |
858 | ||
859 | static inline void __unpack_control(struct l2cap_chan *chan, | |
860 | struct sk_buff *skb) | |
861 | { | |
862 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
863 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
864 | &bt_cb(skb)->control); | |
cec8ab6e | 865 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
866 | } else { |
867 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
868 | &bt_cb(skb)->control); | |
cec8ab6e | 869 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
870 | } |
871 | } | |
872 | ||
b5c6aaed MM |
873 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
874 | { | |
875 | u32 packed; | |
876 | ||
877 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
878 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
879 | ||
880 | if (control->sframe) { | |
881 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
882 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
883 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
884 | } else { | |
885 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
886 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
887 | } | |
888 | ||
889 | return packed; | |
890 | } | |
891 | ||
892 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
893 | { | |
894 | u16 packed; | |
895 | ||
896 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
897 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
898 | ||
899 | if (control->sframe) { | |
900 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
901 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
902 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
903 | } else { | |
904 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
905 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
906 | } | |
907 | ||
908 | return packed; | |
909 | } | |
910 | ||
b76bbd66 MM |
911 | static inline void __pack_control(struct l2cap_chan *chan, |
912 | struct l2cap_ctrl *control, | |
913 | struct sk_buff *skb) | |
914 | { | |
915 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
916 | put_unaligned_le32(__pack_extended_control(control), | |
917 | skb->data + L2CAP_HDR_SIZE); | |
918 | } else { | |
919 | put_unaligned_le16(__pack_enhanced_control(control), | |
920 | skb->data + L2CAP_HDR_SIZE); | |
921 | } | |
922 | } | |
923 | ||
ba7aa64f GP |
924 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
925 | { | |
926 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
927 | return L2CAP_EXT_HDR_SIZE; | |
928 | else | |
929 | return L2CAP_ENH_HDR_SIZE; | |
930 | } | |
931 | ||
a67d7f6f MM |
932 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
933 | u32 control) | |
b5c6aaed MM |
934 | { |
935 | struct sk_buff *skb; | |
936 | struct l2cap_hdr *lh; | |
ba7aa64f | 937 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
938 | |
939 | if (chan->fcs == L2CAP_FCS_CRC16) | |
940 | hlen += L2CAP_FCS_SIZE; | |
941 | ||
a67d7f6f | 942 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 943 | |
b5c6aaed | 944 | if (!skb) |
a67d7f6f | 945 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
946 | |
947 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
948 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
949 | lh->cid = cpu_to_le16(chan->dcid); | |
950 | ||
a67d7f6f MM |
951 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
952 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
953 | else | |
954 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
955 | |
956 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 957 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
958 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
959 | } | |
960 | ||
961 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
962 | return skb; |
963 | } | |
964 | ||
965 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
966 | struct l2cap_ctrl *control) | |
967 | { | |
968 | struct sk_buff *skb; | |
969 | u32 control_field; | |
970 | ||
971 | BT_DBG("chan %p, control %p", chan, control); | |
972 | ||
973 | if (!control->sframe) | |
974 | return; | |
975 | ||
b99e13ad MM |
976 | if (__chan_is_moving(chan)) |
977 | return; | |
978 | ||
a67d7f6f MM |
979 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
980 | !control->poll) | |
981 | control->final = 1; | |
982 | ||
983 | if (control->super == L2CAP_SUPER_RR) | |
984 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
985 | else if (control->super == L2CAP_SUPER_RNR) | |
986 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
987 | ||
988 | if (control->super != L2CAP_SUPER_SREJ) { | |
989 | chan->last_acked_seq = control->reqseq; | |
990 | __clear_ack_timer(chan); | |
991 | } | |
992 | ||
993 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
994 | control->final, control->poll, control->super); | |
995 | ||
996 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
997 | control_field = __pack_extended_control(control); | |
998 | else | |
999 | control_field = __pack_enhanced_control(control); | |
1000 | ||
1001 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
1002 | if (!IS_ERR(skb)) | |
1003 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
1004 | } |
1005 | ||
c9e3d5e0 | 1006 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 1007 | { |
c9e3d5e0 MM |
1008 | struct l2cap_ctrl control; |
1009 | ||
1010 | BT_DBG("chan %p, poll %d", chan, poll); | |
1011 | ||
1012 | memset(&control, 0, sizeof(control)); | |
1013 | control.sframe = 1; | |
1014 | control.poll = poll; | |
1015 | ||
1016 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
1017 | control.super = L2CAP_SUPER_RNR; | |
1018 | else | |
1019 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1020 | |
c9e3d5e0 MM |
1021 | control.reqseq = chan->buffer_seq; |
1022 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1023 | } |
1024 | ||
b4450035 | 1025 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1026 | { |
c1360a1c | 1027 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1028 | } |
1029 | ||
1df7b17a | 1030 | static bool __amp_capable(struct l2cap_chan *chan) |
80d58d0b | 1031 | { |
1df7b17a | 1032 | struct l2cap_conn *conn = chan->conn; |
80d58d0b | 1033 | struct hci_dev *hdev; |
1df7b17a MH |
1034 | bool amp_available = false; |
1035 | ||
1036 | if (!conn->hs_enabled) | |
1037 | return false; | |
1038 | ||
1039 | if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP)) | |
1040 | return false; | |
80d58d0b MH |
1041 | |
1042 | read_lock(&hci_dev_list_lock); | |
1df7b17a | 1043 | list_for_each_entry(hdev, &hci_dev_list, list) { |
80d58d0b | 1044 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1df7b17a MH |
1045 | test_bit(HCI_UP, &hdev->flags)) { |
1046 | amp_available = true; | |
1047 | break; | |
1048 | } | |
1049 | } | |
80d58d0b MH |
1050 | read_unlock(&hci_dev_list_lock); |
1051 | ||
1df7b17a MH |
1052 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1053 | return amp_available; | |
848566b3 MH |
1054 | |
1055 | return false; | |
93c3e8f5 AE |
1056 | } |
1057 | ||
5ce66b59 AE |
1058 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1059 | { | |
1060 | /* Check EFS parameters */ | |
1061 | return true; | |
1062 | } | |
1063 | ||
2766be48 | 1064 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1065 | { |
1066 | struct l2cap_conn *conn = chan->conn; | |
1067 | struct l2cap_conn_req req; | |
1068 | ||
1069 | req.scid = cpu_to_le16(chan->scid); | |
1070 | req.psm = chan->psm; | |
1071 | ||
1072 | chan->ident = l2cap_get_ident(conn); | |
1073 | ||
1074 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1075 | ||
1076 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1077 | } | |
1078 | ||
8eb200bd MM |
1079 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1080 | { | |
1081 | struct l2cap_create_chan_req req; | |
1082 | req.scid = cpu_to_le16(chan->scid); | |
1083 | req.psm = chan->psm; | |
1084 | req.amp_id = amp_id; | |
1085 | ||
1086 | chan->ident = l2cap_get_ident(chan->conn); | |
1087 | ||
1088 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1089 | sizeof(req), &req); | |
1090 | } | |
1091 | ||
02b0fbb9 MM |
1092 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1093 | { | |
1094 | struct sk_buff *skb; | |
1095 | ||
1096 | BT_DBG("chan %p", chan); | |
1097 | ||
1098 | if (chan->mode != L2CAP_MODE_ERTM) | |
1099 | return; | |
1100 | ||
1101 | __clear_retrans_timer(chan); | |
1102 | __clear_monitor_timer(chan); | |
1103 | __clear_ack_timer(chan); | |
1104 | ||
1105 | chan->retry_count = 0; | |
1106 | skb_queue_walk(&chan->tx_q, skb) { | |
1107 | if (bt_cb(skb)->control.retries) | |
1108 | bt_cb(skb)->control.retries = 1; | |
1109 | else | |
1110 | break; | |
1111 | } | |
1112 | ||
1113 | chan->expected_tx_seq = chan->buffer_seq; | |
1114 | ||
1115 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1116 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1117 | l2cap_seq_list_clear(&chan->retrans_list); | |
1118 | l2cap_seq_list_clear(&chan->srej_list); | |
1119 | skb_queue_purge(&chan->srej_q); | |
1120 | ||
1121 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1122 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1123 | ||
1124 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1125 | } | |
1126 | ||
5f3847a4 MM |
1127 | static void l2cap_move_done(struct l2cap_chan *chan) |
1128 | { | |
1129 | u8 move_role = chan->move_role; | |
1130 | BT_DBG("chan %p", chan); | |
1131 | ||
1132 | chan->move_state = L2CAP_MOVE_STABLE; | |
1133 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1134 | ||
1135 | if (chan->mode != L2CAP_MODE_ERTM) | |
1136 | return; | |
1137 | ||
1138 | switch (move_role) { | |
1139 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1140 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1141 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1142 | break; | |
1143 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1144 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1145 | break; | |
1146 | } | |
1147 | } | |
1148 | ||
9f0caeb1 VCG |
1149 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1150 | { | |
2827011f | 1151 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1152 | chan->conf_state = 0; |
1153 | __clear_chan_timer(chan); | |
1154 | ||
54a59aa2 | 1155 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1156 | |
fd83e2c2 | 1157 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1158 | } |
1159 | ||
93c3e8f5 AE |
1160 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1161 | { | |
1162 | if (__amp_capable(chan)) { | |
1163 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1164 | a2mp_discover_amp(chan); | |
1165 | } else { | |
1166 | l2cap_send_conn_req(chan); | |
1167 | } | |
1168 | } | |
1169 | ||
fc7f8a7e | 1170 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1171 | { |
8c1d787b | 1172 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1173 | |
9f0caeb1 VCG |
1174 | if (conn->hcon->type == LE_LINK) { |
1175 | l2cap_chan_ready(chan); | |
1176 | return; | |
1177 | } | |
1178 | ||
79d554a6 | 1179 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1180 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1181 | return; | |
1182 | ||
d45fc423 | 1183 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1184 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1185 | l2cap_start_connection(chan); |
1186 | } | |
79d554a6 MH |
1187 | } else { |
1188 | struct l2cap_info_req req; | |
ac73498c | 1189 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1190 | |
1191 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1192 | conn->info_ident = l2cap_get_ident(conn); | |
1193 | ||
ba13ccd9 | 1194 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1195 | |
2d792818 GP |
1196 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1197 | sizeof(req), &req); | |
79d554a6 MH |
1198 | } |
1199 | } | |
1200 | ||
cf6c2c0b GP |
1201 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1202 | { | |
1203 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1204 | if (!disable_ertm) |
cf6c2c0b GP |
1205 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1206 | ||
1207 | switch (mode) { | |
1208 | case L2CAP_MODE_ERTM: | |
1209 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1210 | case L2CAP_MODE_STREAMING: | |
1211 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1212 | default: | |
1213 | return 0x00; | |
1214 | } | |
1215 | } | |
1216 | ||
5e4e3972 | 1217 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1218 | { |
5e4e3972 | 1219 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1220 | struct l2cap_disconn_req req; |
1221 | ||
c13ffa62 GP |
1222 | if (!conn) |
1223 | return; | |
1224 | ||
aad3d0e3 | 1225 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1226 | __clear_retrans_timer(chan); |
1227 | __clear_monitor_timer(chan); | |
1228 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1229 | } |
1230 | ||
416fa752 | 1231 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
d117773c | 1232 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1233 | return; |
1234 | } | |
1235 | ||
fe4128e0 GP |
1236 | req.dcid = cpu_to_le16(chan->dcid); |
1237 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1238 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1239 | sizeof(req), &req); | |
c13ffa62 | 1240 | |
f8e73017 | 1241 | l2cap_state_change_and_error(chan, BT_DISCONN, err); |
22121fc9 GP |
1242 | } |
1243 | ||
1da177e4 | 1244 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1245 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1246 | { | |
3df91ea2 | 1247 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1248 | |
1249 | BT_DBG("conn %p", conn); | |
1250 | ||
3df91ea2 | 1251 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1252 | |
3df91ea2 | 1253 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6be36555 | 1254 | l2cap_chan_lock(chan); |
4e8402a3 | 1255 | |
715ec005 | 1256 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1257 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1258 | continue; |
1259 | } | |
1260 | ||
89bc500e | 1261 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1262 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1263 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1264 | l2cap_chan_unlock(chan); |
47731de7 GP |
1265 | continue; |
1266 | } | |
79d554a6 | 1267 | |
c1360a1c | 1268 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1269 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1270 | &chan->conf_state)) { |
89bc500e | 1271 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1272 | l2cap_chan_unlock(chan); |
47731de7 | 1273 | continue; |
b1235d79 | 1274 | } |
47731de7 | 1275 | |
93c3e8f5 | 1276 | l2cap_start_connection(chan); |
47731de7 | 1277 | |
89bc500e | 1278 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1279 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1280 | char buf[128]; |
fe4128e0 GP |
1281 | rsp.scid = cpu_to_le16(chan->dcid); |
1282 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1283 | |
d45fc423 | 1284 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 1285 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
ac73498c AE |
1286 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1287 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1288 | chan->ops->defer(chan); |
f66dc81f MH |
1289 | |
1290 | } else { | |
acdcabf5 | 1291 | l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1292 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1293 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1294 | } |
79d554a6 | 1295 | } else { |
ac73498c AE |
1296 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1297 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1298 | } |
1299 | ||
fc7f8a7e | 1300 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1301 | sizeof(rsp), &rsp); |
e9aeb2dd | 1302 | |
c1360a1c | 1303 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1304 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1305 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1306 | continue; |
1307 | } | |
1308 | ||
c1360a1c | 1309 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1310 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1311 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1312 | chan->num_conf_req++; |
4e8402a3 MH |
1313 | } |
1314 | ||
6be36555 | 1315 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1316 | } |
1317 | ||
3df91ea2 | 1318 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1319 | } |
1320 | ||
c2287681 | 1321 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1322 | * Returns closest match, locked. |
1323 | */ | |
d9b88702 | 1324 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1325 | bdaddr_t *src, |
1326 | bdaddr_t *dst) | |
b62f328b | 1327 | { |
23691d75 | 1328 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1329 | |
23691d75 | 1330 | read_lock(&chan_list_lock); |
b62f328b | 1331 | |
23691d75 | 1332 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1333 | if (state && c->state != state) |
b62f328b VT |
1334 | continue; |
1335 | ||
23691d75 | 1336 | if (c->scid == cid) { |
c2287681 IY |
1337 | int src_match, dst_match; |
1338 | int src_any, dst_any; | |
1339 | ||
b62f328b | 1340 | /* Exact match. */ |
7eafc59e MH |
1341 | src_match = !bacmp(&c->src, src); |
1342 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1343 | if (src_match && dst_match) { |
23691d75 GP |
1344 | read_unlock(&chan_list_lock); |
1345 | return c; | |
1346 | } | |
b62f328b VT |
1347 | |
1348 | /* Closest match */ | |
7eafc59e MH |
1349 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1350 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1351 | if ((src_match && dst_any) || (src_any && dst_match) || |
1352 | (src_any && dst_any)) | |
23691d75 | 1353 | c1 = c; |
b62f328b VT |
1354 | } |
1355 | } | |
280f294f | 1356 | |
23691d75 | 1357 | read_unlock(&chan_list_lock); |
b62f328b | 1358 | |
23691d75 | 1359 | return c1; |
b62f328b VT |
1360 | } |
1361 | ||
1362 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1363 | { | |
cc8dba2b | 1364 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 1365 | struct l2cap_chan *chan, *pchan; |
cc8dba2b | 1366 | u8 dst_type; |
b62f328b VT |
1367 | |
1368 | BT_DBG(""); | |
1369 | ||
1370 | /* Check if we have socket listening on cid */ | |
073d1cf3 | 1371 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT, |
cc8dba2b | 1372 | &hcon->src, &hcon->dst); |
23691d75 | 1373 | if (!pchan) |
b62f328b VT |
1374 | return; |
1375 | ||
44f3b0fb JH |
1376 | /* Client ATT sockets should override the server one */ |
1377 | if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT)) | |
1378 | return; | |
1379 | ||
cc8dba2b MH |
1380 | dst_type = bdaddr_type(hcon, hcon->dst_type); |
1381 | ||
1382 | /* If device is blocked, do not create a channel for it */ | |
1383 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type)) | |
1384 | return; | |
1385 | ||
8ffb9290 | 1386 | l2cap_chan_lock(pchan); |
62f3a2cf | 1387 | |
80b98027 | 1388 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1389 | if (!chan) |
b62f328b VT |
1390 | goto clean; |
1391 | ||
9f22398c JH |
1392 | chan->dcid = L2CAP_CID_ATT; |
1393 | ||
cc8dba2b MH |
1394 | bacpy(&chan->src, &hcon->src); |
1395 | bacpy(&chan->dst, &hcon->dst); | |
1396 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
1397 | chan->dst_type = dst_type; | |
b62f328b | 1398 | |
44f3b0fb | 1399 | __l2cap_chan_add(conn, chan); |
48454079 | 1400 | |
b62f328b | 1401 | clean: |
8ffb9290 | 1402 | l2cap_chan_unlock(pchan); |
b62f328b VT |
1403 | } |
1404 | ||
4e8402a3 MH |
1405 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1406 | { | |
48454079 | 1407 | struct l2cap_chan *chan; |
cc110922 | 1408 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1409 | |
79d554a6 | 1410 | BT_DBG("conn %p", conn); |
4e8402a3 | 1411 | |
d8729922 JH |
1412 | /* For outgoing pairing which doesn't necessarily have an |
1413 | * associated socket (e.g. mgmt_pair_device). | |
1414 | */ | |
cc110922 VCG |
1415 | if (hcon->out && hcon->type == LE_LINK) |
1416 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1417 | |
3df91ea2 | 1418 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1419 | |
44f3b0fb JH |
1420 | if (hcon->type == LE_LINK) |
1421 | l2cap_le_conn_ready(conn); | |
1422 | ||
3df91ea2 | 1423 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1424 | |
6be36555 | 1425 | l2cap_chan_lock(chan); |
4e8402a3 | 1426 | |
416fa752 AE |
1427 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
1428 | l2cap_chan_unlock(chan); | |
1429 | continue; | |
1430 | } | |
1431 | ||
cc110922 VCG |
1432 | if (hcon->type == LE_LINK) { |
1433 | if (smp_conn_security(hcon, chan->sec_level)) | |
cf4cd009 | 1434 | l2cap_chan_ready(chan); |
acd7d370 | 1435 | |
63128451 | 1436 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
74e75740 | 1437 | l2cap_chan_ready(chan); |
b501d6a1 | 1438 | |
1c244f79 | 1439 | } else if (chan->state == BT_CONNECT) { |
fc7f8a7e | 1440 | l2cap_do_start(chan); |
1c244f79 | 1441 | } |
4e8402a3 | 1442 | |
6be36555 | 1443 | l2cap_chan_unlock(chan); |
4e8402a3 | 1444 | } |
79d554a6 | 1445 | |
3df91ea2 | 1446 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1447 | } |
1448 | ||
1449 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1450 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1451 | { | |
48454079 | 1452 | struct l2cap_chan *chan; |
4e8402a3 MH |
1453 | |
1454 | BT_DBG("conn %p", conn); | |
1455 | ||
3df91ea2 | 1456 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1457 | |
3df91ea2 | 1458 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1459 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1460 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1461 | } |
1462 | ||
3df91ea2 | 1463 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1464 | } |
1465 | ||
f878fcad | 1466 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1467 | { |
f878fcad | 1468 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1469 | info_timer.work); |
4e8402a3 | 1470 | |
984947dc | 1471 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1472 | conn->info_ident = 0; |
984947dc | 1473 | |
4e8402a3 MH |
1474 | l2cap_conn_start(conn); |
1475 | } | |
1476 | ||
2c8e1411 DH |
1477 | /* |
1478 | * l2cap_user | |
1479 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1480 | * callback is called during registration. The ->remove callback is called | |
1481 | * during unregistration. | |
1482 | * An l2cap_user object can either be explicitly unregistered or when the | |
1483 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1484 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1485 | * External modules must own a reference to the l2cap_conn object if they intend | |
1486 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1487 | * any time if they don't. | |
1488 | */ | |
1489 | ||
1490 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1491 | { | |
1492 | struct hci_dev *hdev = conn->hcon->hdev; | |
1493 | int ret; | |
1494 | ||
1495 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1496 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1497 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1498 | * relies on the parent hci_conn object to be locked. This itself relies | |
1499 | * on the hci_dev object to be locked. So we must lock the hci device | |
1500 | * here, too. */ | |
1501 | ||
1502 | hci_dev_lock(hdev); | |
1503 | ||
1504 | if (user->list.next || user->list.prev) { | |
1505 | ret = -EINVAL; | |
1506 | goto out_unlock; | |
1507 | } | |
1508 | ||
1509 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1510 | if (!conn->hchan) { | |
1511 | ret = -ENODEV; | |
1512 | goto out_unlock; | |
1513 | } | |
1514 | ||
1515 | ret = user->probe(conn, user); | |
1516 | if (ret) | |
1517 | goto out_unlock; | |
1518 | ||
1519 | list_add(&user->list, &conn->users); | |
1520 | ret = 0; | |
1521 | ||
1522 | out_unlock: | |
1523 | hci_dev_unlock(hdev); | |
1524 | return ret; | |
1525 | } | |
1526 | EXPORT_SYMBOL(l2cap_register_user); | |
1527 | ||
1528 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1529 | { | |
1530 | struct hci_dev *hdev = conn->hcon->hdev; | |
1531 | ||
1532 | hci_dev_lock(hdev); | |
1533 | ||
1534 | if (!user->list.next || !user->list.prev) | |
1535 | goto out_unlock; | |
1536 | ||
1537 | list_del(&user->list); | |
1538 | user->list.next = NULL; | |
1539 | user->list.prev = NULL; | |
1540 | user->remove(conn, user); | |
1541 | ||
1542 | out_unlock: | |
1543 | hci_dev_unlock(hdev); | |
1544 | } | |
1545 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1546 | ||
1547 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1548 | { | |
1549 | struct l2cap_user *user; | |
1550 | ||
1551 | while (!list_empty(&conn->users)) { | |
1552 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1553 | list_del(&user->list); | |
1554 | user->list.next = NULL; | |
1555 | user->list.prev = NULL; | |
1556 | user->remove(conn, user); | |
1557 | } | |
1558 | } | |
1559 | ||
5d3de7df VCG |
1560 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1561 | { | |
1562 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1563 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1564 | |
1565 | if (!conn) | |
1566 | return; | |
1567 | ||
1568 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1569 | ||
1570 | kfree_skb(conn->rx_skb); | |
1571 | ||
2c8e1411 DH |
1572 | l2cap_unregister_all_users(conn); |
1573 | ||
3df91ea2 AE |
1574 | mutex_lock(&conn->chan_lock); |
1575 | ||
5d3de7df VCG |
1576 | /* Kill channels */ |
1577 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1578 | l2cap_chan_hold(chan); |
6be36555 AE |
1579 | l2cap_chan_lock(chan); |
1580 | ||
5d3de7df | 1581 | l2cap_chan_del(chan, err); |
6be36555 AE |
1582 | |
1583 | l2cap_chan_unlock(chan); | |
1584 | ||
80b98027 | 1585 | chan->ops->close(chan); |
61d6ef3e | 1586 | l2cap_chan_put(chan); |
5d3de7df VCG |
1587 | } |
1588 | ||
3df91ea2 AE |
1589 | mutex_unlock(&conn->chan_lock); |
1590 | ||
73d80deb LAD |
1591 | hci_chan_del(conn->hchan); |
1592 | ||
5d3de7df | 1593 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1594 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1595 | |
51a8efd7 | 1596 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1597 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1598 | smp_chan_destroy(conn); |
d26a2345 | 1599 | } |
5d3de7df VCG |
1600 | |
1601 | hcon->l2cap_data = NULL; | |
9c903e37 DH |
1602 | conn->hchan = NULL; |
1603 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1604 | } |
1605 | ||
6c9d42a1 | 1606 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1607 | { |
6c9d42a1 | 1608 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1609 | security_timer.work); |
5d3de7df | 1610 | |
d06cc416 JH |
1611 | BT_DBG("conn %p", conn); |
1612 | ||
1613 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1614 | smp_chan_destroy(conn); | |
1615 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1616 | } | |
5d3de7df VCG |
1617 | } |
1618 | ||
baf43251 | 1619 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
1da177e4 | 1620 | { |
0139418c | 1621 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1622 | struct hci_chan *hchan; |
1da177e4 | 1623 | |
baf43251 | 1624 | if (conn) |
1da177e4 LT |
1625 | return conn; |
1626 | ||
73d80deb LAD |
1627 | hchan = hci_chan_create(hcon); |
1628 | if (!hchan) | |
1629 | return NULL; | |
1630 | ||
8bcde1f2 | 1631 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); |
73d80deb LAD |
1632 | if (!conn) { |
1633 | hci_chan_del(hchan); | |
1da177e4 | 1634 | return NULL; |
73d80deb | 1635 | } |
1da177e4 | 1636 | |
9c903e37 | 1637 | kref_init(&conn->ref); |
1da177e4 LT |
1638 | hcon->l2cap_data = conn; |
1639 | conn->hcon = hcon; | |
9c903e37 | 1640 | hci_conn_get(conn->hcon); |
73d80deb | 1641 | conn->hchan = hchan; |
1da177e4 | 1642 | |
73d80deb | 1643 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1644 | |
dcc042d5 | 1645 | switch (hcon->type) { |
dcc042d5 AE |
1646 | case LE_LINK: |
1647 | if (hcon->hdev->le_mtu) { | |
1648 | conn->mtu = hcon->hdev->le_mtu; | |
1649 | break; | |
1650 | } | |
1651 | /* fall through */ | |
dcc042d5 | 1652 | default: |
acd7d370 | 1653 | conn->mtu = hcon->hdev->acl_mtu; |
dcc042d5 AE |
1654 | break; |
1655 | } | |
acd7d370 | 1656 | |
4e8402a3 MH |
1657 | conn->feat_mask = 0; |
1658 | ||
848566b3 MH |
1659 | if (hcon->type == ACL_LINK) |
1660 | conn->hs_enabled = test_bit(HCI_HS_ENABLED, | |
1661 | &hcon->hdev->dev_flags); | |
1662 | ||
1da177e4 | 1663 | spin_lock_init(&conn->lock); |
3df91ea2 | 1664 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1665 | |
1666 | INIT_LIST_HEAD(&conn->chan_l); | |
2c8e1411 | 1667 | INIT_LIST_HEAD(&conn->users); |
1da177e4 | 1668 | |
5d3de7df | 1669 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1670 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1671 | else |
030013d8 | 1672 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1673 | |
9f5a0d7b | 1674 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1675 | |
1da177e4 LT |
1676 | return conn; |
1677 | } | |
1678 | ||
9c903e37 DH |
1679 | static void l2cap_conn_free(struct kref *ref) |
1680 | { | |
1681 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1682 | ||
1683 | hci_conn_put(conn->hcon); | |
1684 | kfree(conn); | |
1685 | } | |
1686 | ||
1687 | void l2cap_conn_get(struct l2cap_conn *conn) | |
1688 | { | |
1689 | kref_get(&conn->ref); | |
1690 | } | |
1691 | EXPORT_SYMBOL(l2cap_conn_get); | |
1692 | ||
1693 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1694 | { | |
1695 | kref_put(&conn->ref, l2cap_conn_free); | |
1696 | } | |
1697 | EXPORT_SYMBOL(l2cap_conn_put); | |
1698 | ||
1da177e4 | 1699 | /* ---- Socket interface ---- */ |
1da177e4 | 1700 | |
c2287681 | 1701 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1702 | * Returns closest match. |
1703 | */ | |
c2287681 IY |
1704 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1705 | bdaddr_t *src, | |
1706 | bdaddr_t *dst) | |
1da177e4 | 1707 | { |
23691d75 | 1708 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1709 | |
23691d75 | 1710 | read_lock(&chan_list_lock); |
e0f0cb56 | 1711 | |
23691d75 | 1712 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1713 | if (state && c->state != state) |
1da177e4 LT |
1714 | continue; |
1715 | ||
23691d75 | 1716 | if (c->psm == psm) { |
c2287681 IY |
1717 | int src_match, dst_match; |
1718 | int src_any, dst_any; | |
1719 | ||
1da177e4 | 1720 | /* Exact match. */ |
7eafc59e MH |
1721 | src_match = !bacmp(&c->src, src); |
1722 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1723 | if (src_match && dst_match) { |
a7567b20 | 1724 | read_unlock(&chan_list_lock); |
23691d75 GP |
1725 | return c; |
1726 | } | |
1da177e4 LT |
1727 | |
1728 | /* Closest match */ | |
7eafc59e MH |
1729 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1730 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1731 | if ((src_match && dst_any) || (src_any && dst_match) || |
1732 | (src_any && dst_any)) | |
23691d75 | 1733 | c1 = c; |
1da177e4 LT |
1734 | } |
1735 | } | |
1da177e4 | 1736 | |
23691d75 | 1737 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1738 | |
23691d75 | 1739 | return c1; |
1da177e4 LT |
1740 | } |
1741 | ||
8e9f9892 AG |
1742 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1743 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1744 | { |
1da177e4 LT |
1745 | struct l2cap_conn *conn; |
1746 | struct hci_conn *hcon; | |
1747 | struct hci_dev *hdev; | |
09ab6f4c | 1748 | __u8 auth_type; |
44d0e48e | 1749 | int err; |
1da177e4 | 1750 | |
7eafc59e | 1751 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, |
ab19516a | 1752 | dst_type, __le16_to_cpu(psm)); |
1da177e4 | 1753 | |
7eafc59e | 1754 | hdev = hci_get_route(dst, &chan->src); |
af05b30b | 1755 | if (!hdev) |
1da177e4 LT |
1756 | return -EHOSTUNREACH; |
1757 | ||
09fd0de5 | 1758 | hci_dev_lock(hdev); |
1da177e4 | 1759 | |
6be36555 | 1760 | l2cap_chan_lock(chan); |
03a00194 GP |
1761 | |
1762 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1763 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
2d792818 | 1764 | chan->chan_type != L2CAP_CHAN_RAW) { |
03a00194 GP |
1765 | err = -EINVAL; |
1766 | goto done; | |
1767 | } | |
1768 | ||
1769 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1770 | err = -EINVAL; | |
1771 | goto done; | |
1772 | } | |
1773 | ||
1774 | switch (chan->mode) { | |
1775 | case L2CAP_MODE_BASIC: | |
1776 | break; | |
1777 | case L2CAP_MODE_ERTM: | |
1778 | case L2CAP_MODE_STREAMING: | |
1779 | if (!disable_ertm) | |
1780 | break; | |
1781 | /* fall through */ | |
1782 | default: | |
1783 | err = -ENOTSUPP; | |
1784 | goto done; | |
1785 | } | |
1786 | ||
0797e01d | 1787 | switch (chan->state) { |
03a00194 GP |
1788 | case BT_CONNECT: |
1789 | case BT_CONNECT2: | |
1790 | case BT_CONFIG: | |
1791 | /* Already connecting */ | |
1792 | err = 0; | |
1793 | goto done; | |
1794 | ||
1795 | case BT_CONNECTED: | |
1796 | /* Already connected */ | |
1797 | err = -EISCONN; | |
1798 | goto done; | |
1799 | ||
1800 | case BT_OPEN: | |
1801 | case BT_BOUND: | |
1802 | /* Can connect */ | |
1803 | break; | |
1804 | ||
1805 | default: | |
1806 | err = -EBADFD; | |
1807 | goto done; | |
1808 | } | |
1809 | ||
1810 | /* Set destination address and psm */ | |
7eafc59e | 1811 | bacpy(&chan->dst, dst); |
4f1654e0 | 1812 | chan->dst_type = dst_type; |
6be36555 | 1813 | |
03a00194 GP |
1814 | chan->psm = psm; |
1815 | chan->dcid = cid; | |
1da177e4 | 1816 | |
4343478f | 1817 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1818 | |
f224ca5f | 1819 | if (bdaddr_type_is_le(dst_type)) |
8e9f9892 | 1820 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1821 | chan->sec_level, auth_type); |
acd7d370 | 1822 | else |
8e9f9892 | 1823 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1824 | chan->sec_level, auth_type); |
acd7d370 | 1825 | |
30e76272 VT |
1826 | if (IS_ERR(hcon)) { |
1827 | err = PTR_ERR(hcon); | |
1da177e4 | 1828 | goto done; |
30e76272 | 1829 | } |
1da177e4 | 1830 | |
baf43251 | 1831 | conn = l2cap_conn_add(hcon); |
1da177e4 | 1832 | if (!conn) { |
76a68ba0 | 1833 | hci_conn_drop(hcon); |
30e76272 | 1834 | err = -ENOMEM; |
1da177e4 LT |
1835 | goto done; |
1836 | } | |
1837 | ||
141d5706 JH |
1838 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { |
1839 | hci_conn_drop(hcon); | |
1840 | err = -EBUSY; | |
1841 | goto done; | |
9f0caeb1 VCG |
1842 | } |
1843 | ||
1da177e4 | 1844 | /* Update source addr of the socket */ |
7eafc59e | 1845 | bacpy(&chan->src, &hcon->src); |
4f1654e0 | 1846 | chan->src_type = bdaddr_type(hcon, hcon->src_type); |
1da177e4 | 1847 | |
6be36555 | 1848 | l2cap_chan_unlock(chan); |
48454079 | 1849 | l2cap_chan_add(conn, chan); |
6be36555 | 1850 | l2cap_chan_lock(chan); |
48454079 | 1851 | |
5ee9891d JH |
1852 | /* l2cap_chan_add takes its own ref so we can drop this one */ |
1853 | hci_conn_drop(hcon); | |
1854 | ||
6be36555 | 1855 | l2cap_state_change(chan, BT_CONNECT); |
8d836d71 | 1856 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 LT |
1857 | |
1858 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1859 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1860 | __clear_chan_timer(chan); |
d45fc423 | 1861 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1862 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1863 | } else |
fc7f8a7e | 1864 | l2cap_do_start(chan); |
1da177e4 LT |
1865 | } |
1866 | ||
30e76272 VT |
1867 | err = 0; |
1868 | ||
1da177e4 | 1869 | done: |
6be36555 | 1870 | l2cap_chan_unlock(chan); |
09fd0de5 | 1871 | hci_dev_unlock(hdev); |
1da177e4 LT |
1872 | hci_dev_put(hdev); |
1873 | return err; | |
1874 | } | |
1875 | ||
721c4181 | 1876 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1877 | { |
721c4181 | 1878 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1879 | monitor_timer.work); |
e90bac06 | 1880 | |
525cd185 | 1881 | BT_DBG("chan %p", chan); |
0e98958d | 1882 | |
6be36555 AE |
1883 | l2cap_chan_lock(chan); |
1884 | ||
80909e04 | 1885 | if (!chan->conn) { |
6be36555 | 1886 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1887 | l2cap_chan_put(chan); |
e90bac06 GP |
1888 | return; |
1889 | } | |
1890 | ||
401bb1f7 | 1891 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1892 | |
6be36555 | 1893 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1894 | l2cap_chan_put(chan); |
e90bac06 GP |
1895 | } |
1896 | ||
721c4181 | 1897 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1898 | { |
721c4181 | 1899 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1900 | retrans_timer.work); |
e90bac06 | 1901 | |
49208c9c | 1902 | BT_DBG("chan %p", chan); |
0e98958d | 1903 | |
6be36555 AE |
1904 | l2cap_chan_lock(chan); |
1905 | ||
80909e04 MM |
1906 | if (!chan->conn) { |
1907 | l2cap_chan_unlock(chan); | |
1908 | l2cap_chan_put(chan); | |
1909 | return; | |
1910 | } | |
6be36555 | 1911 | |
401bb1f7 | 1912 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1913 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1914 | l2cap_chan_put(chan); |
e90bac06 GP |
1915 | } |
1916 | ||
d660366d GP |
1917 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1918 | struct sk_buff_head *skbs) | |
6840ed07 | 1919 | { |
ccbb84af | 1920 | struct sk_buff *skb; |
3733937d | 1921 | struct l2cap_ctrl *control; |
6840ed07 | 1922 | |
3733937d MM |
1923 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1924 | ||
b99e13ad MM |
1925 | if (__chan_is_moving(chan)) |
1926 | return; | |
1927 | ||
3733937d MM |
1928 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1929 | ||
1930 | while (!skb_queue_empty(&chan->tx_q)) { | |
1931 | ||
1932 | skb = skb_dequeue(&chan->tx_q); | |
1933 | ||
1934 | bt_cb(skb)->control.retries = 1; | |
1935 | control = &bt_cb(skb)->control; | |
1936 | ||
1937 | control->reqseq = 0; | |
1938 | control->txseq = chan->next_tx_seq; | |
1939 | ||
1940 | __pack_control(chan, control, skb); | |
6840ed07 | 1941 | |
47d1ec61 | 1942 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1943 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1944 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1945 | } |
1946 | ||
4343478f | 1947 | l2cap_do_send(chan, skb); |
6840ed07 | 1948 | |
b4400672 | 1949 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1950 | |
836be934 | 1951 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1952 | chan->frames_sent++; |
6840ed07 | 1953 | } |
6840ed07 GP |
1954 | } |
1955 | ||
67c9e840 | 1956 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1957 | { |
1958 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1959 | struct l2cap_ctrl *control; |
1960 | int sent = 0; | |
1961 | ||
1962 | BT_DBG("chan %p", chan); | |
1c2acffb | 1963 | |
89bc500e | 1964 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1965 | return -ENOTCONN; |
e90bac06 | 1966 | |
94122bbe MM |
1967 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1968 | return 0; | |
1969 | ||
b99e13ad MM |
1970 | if (__chan_is_moving(chan)) |
1971 | return 0; | |
1972 | ||
18a48e76 MM |
1973 | while (chan->tx_send_head && |
1974 | chan->unacked_frames < chan->remote_tx_win && | |
1975 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1976 | |
18a48e76 | 1977 | skb = chan->tx_send_head; |
e90bac06 | 1978 | |
18a48e76 MM |
1979 | bt_cb(skb)->control.retries = 1; |
1980 | control = &bt_cb(skb)->control; | |
95ffa978 | 1981 | |
e2ab4353 | 1982 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1983 | control->final = 1; |
e2ab4353 | 1984 | |
18a48e76 MM |
1985 | control->reqseq = chan->buffer_seq; |
1986 | chan->last_acked_seq = chan->buffer_seq; | |
1987 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1988 | |
18a48e76 | 1989 | __pack_control(chan, control, skb); |
e90bac06 | 1990 | |
47d1ec61 | 1991 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 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 | ||
18a48e76 MM |
1996 | /* Clone after data has been modified. Data is assumed to be |
1997 | read-only (for locking purposes) on cloned sk_buffs. | |
1998 | */ | |
1999 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 2000 | |
18a48e76 MM |
2001 | if (!tx_skb) |
2002 | break; | |
1c2acffb | 2003 | |
18a48e76 | 2004 | __set_retrans_timer(chan); |
836be934 AE |
2005 | |
2006 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 2007 | chan->unacked_frames++; |
6a026610 | 2008 | chan->frames_sent++; |
18a48e76 | 2009 | sent++; |
1c2acffb | 2010 | |
58d35f87 GP |
2011 | if (skb_queue_is_last(&chan->tx_q, skb)) |
2012 | chan->tx_send_head = NULL; | |
1c2acffb | 2013 | else |
58d35f87 | 2014 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
2015 | |
2016 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 2017 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
2018 | } |
2019 | ||
b4400672 AE |
2020 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
2021 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
2022 | |
2023 | return sent; | |
9e917af1 GP |
2024 | } |
2025 | ||
e1fbd4c1 MM |
2026 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
2027 | { | |
2028 | struct l2cap_ctrl control; | |
2029 | struct sk_buff *skb; | |
2030 | struct sk_buff *tx_skb; | |
2031 | u16 seq; | |
2032 | ||
2033 | BT_DBG("chan %p", chan); | |
2034 | ||
2035 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2036 | return; | |
2037 | ||
b99e13ad MM |
2038 | if (__chan_is_moving(chan)) |
2039 | return; | |
2040 | ||
e1fbd4c1 MM |
2041 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
2042 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
2043 | ||
2044 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
2045 | if (!skb) { | |
2046 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 2047 | seq); |
e1fbd4c1 MM |
2048 | continue; |
2049 | } | |
2050 | ||
2051 | bt_cb(skb)->control.retries++; | |
2052 | control = bt_cb(skb)->control; | |
2053 | ||
2054 | if (chan->max_tx != 0 && | |
2055 | bt_cb(skb)->control.retries > chan->max_tx) { | |
2056 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 2057 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
2058 | l2cap_seq_list_clear(&chan->retrans_list); |
2059 | break; | |
2060 | } | |
2061 | ||
2062 | control.reqseq = chan->buffer_seq; | |
2063 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
2064 | control.final = 1; | |
2065 | else | |
2066 | control.final = 0; | |
2067 | ||
2068 | if (skb_cloned(skb)) { | |
2069 | /* Cloned sk_buffs are read-only, so we need a | |
2070 | * writeable copy | |
2071 | */ | |
8bcde1f2 | 2072 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 2073 | } else { |
8bcde1f2 | 2074 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
2075 | } |
2076 | ||
2077 | if (!tx_skb) { | |
2078 | l2cap_seq_list_clear(&chan->retrans_list); | |
2079 | break; | |
2080 | } | |
2081 | ||
2082 | /* Update skb contents */ | |
2083 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
2084 | put_unaligned_le32(__pack_extended_control(&control), | |
2085 | tx_skb->data + L2CAP_HDR_SIZE); | |
2086 | } else { | |
2087 | put_unaligned_le16(__pack_enhanced_control(&control), | |
2088 | tx_skb->data + L2CAP_HDR_SIZE); | |
2089 | } | |
2090 | ||
2091 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
2092 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
2093 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
2094 | L2CAP_FCS_SIZE)); | |
2095 | } | |
2096 | ||
2097 | l2cap_do_send(chan, tx_skb); | |
2098 | ||
2099 | BT_DBG("Resent txseq %d", control.txseq); | |
2100 | ||
2101 | chan->last_acked_seq = chan->buffer_seq; | |
2102 | } | |
2103 | } | |
2104 | ||
f80842a8 MM |
2105 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2106 | struct l2cap_ctrl *control) | |
2107 | { | |
2108 | BT_DBG("chan %p, control %p", chan, control); | |
2109 | ||
2110 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2111 | l2cap_ertm_resend(chan); | |
2112 | } | |
2113 | ||
d2a7ac5d MM |
2114 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2115 | struct l2cap_ctrl *control) | |
2116 | { | |
e1fbd4c1 MM |
2117 | struct sk_buff *skb; |
2118 | ||
2119 | BT_DBG("chan %p, control %p", chan, control); | |
2120 | ||
2121 | if (control->poll) | |
2122 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2123 | ||
2124 | l2cap_seq_list_clear(&chan->retrans_list); | |
2125 | ||
2126 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2127 | return; | |
2128 | ||
2129 | if (chan->unacked_frames) { | |
2130 | skb_queue_walk(&chan->tx_q, skb) { | |
2131 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2132 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2133 | break; |
2134 | } | |
2135 | ||
2136 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2137 | if (skb == chan->tx_send_head) | |
2138 | break; | |
2139 | ||
2140 | l2cap_seq_list_append(&chan->retrans_list, | |
2141 | bt_cb(skb)->control.txseq); | |
2142 | } | |
2143 | ||
2144 | l2cap_ertm_resend(chan); | |
2145 | } | |
d2a7ac5d MM |
2146 | } |
2147 | ||
0a0aba42 | 2148 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2149 | { |
0a0aba42 MM |
2150 | struct l2cap_ctrl control; |
2151 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2152 | chan->last_acked_seq); | |
2153 | int threshold; | |
9e917af1 | 2154 | |
0a0aba42 MM |
2155 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2156 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2157 | |
0a0aba42 MM |
2158 | memset(&control, 0, sizeof(control)); |
2159 | control.sframe = 1; | |
dfc909be | 2160 | |
0a0aba42 MM |
2161 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2162 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2163 | __clear_ack_timer(chan); | |
2164 | control.super = L2CAP_SUPER_RNR; | |
2165 | control.reqseq = chan->buffer_seq; | |
2166 | l2cap_send_sframe(chan, &control); | |
2167 | } else { | |
2168 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2169 | l2cap_ertm_send(chan); | |
2170 | /* If any i-frames were sent, they included an ack */ | |
2171 | if (chan->buffer_seq == chan->last_acked_seq) | |
2172 | frames_to_ack = 0; | |
2173 | } | |
dfc909be | 2174 | |
c20f8e35 | 2175 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2176 | * Calculate without mul or div |
2177 | */ | |
c20f8e35 | 2178 | threshold = chan->ack_win; |
0a0aba42 MM |
2179 | threshold += threshold << 1; |
2180 | threshold >>= 2; | |
2181 | ||
b4400672 | 2182 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2183 | threshold); |
2184 | ||
2185 | if (frames_to_ack >= threshold) { | |
2186 | __clear_ack_timer(chan); | |
2187 | control.super = L2CAP_SUPER_RR; | |
2188 | control.reqseq = chan->buffer_seq; | |
2189 | l2cap_send_sframe(chan, &control); | |
2190 | frames_to_ack = 0; | |
2191 | } | |
1c2acffb | 2192 | |
0a0aba42 MM |
2193 | if (frames_to_ack) |
2194 | __set_ack_timer(chan); | |
2195 | } | |
b17e73bb SJ |
2196 | } |
2197 | ||
04124681 GP |
2198 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2199 | struct msghdr *msg, int len, | |
2200 | int count, struct sk_buff *skb) | |
1c2acffb | 2201 | { |
0952a57a | 2202 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2203 | struct sk_buff **frag; |
90338947 | 2204 | int sent = 0; |
1da177e4 | 2205 | |
59203a21 | 2206 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 2207 | return -EFAULT; |
1da177e4 LT |
2208 | |
2209 | sent += count; | |
2210 | len -= count; | |
2211 | ||
2212 | /* Continuation fragments (no L2CAP header) */ | |
2213 | frag = &skb_shinfo(skb)->frag_list; | |
2214 | while (len) { | |
fbe00700 GP |
2215 | struct sk_buff *tmp; |
2216 | ||
1da177e4 LT |
2217 | count = min_t(unsigned int, conn->mtu, len); |
2218 | ||
fbe00700 GP |
2219 | tmp = chan->ops->alloc_skb(chan, count, |
2220 | msg->msg_flags & MSG_DONTWAIT); | |
2221 | if (IS_ERR(tmp)) | |
2222 | return PTR_ERR(tmp); | |
2223 | ||
2224 | *frag = tmp; | |
2f7719ce | 2225 | |
1c2acffb GP |
2226 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
2227 | return -EFAULT; | |
1da177e4 | 2228 | |
5e59b791 LAD |
2229 | (*frag)->priority = skb->priority; |
2230 | ||
1da177e4 LT |
2231 | sent += count; |
2232 | len -= count; | |
2233 | ||
2d0ed3d5 GP |
2234 | skb->len += (*frag)->len; |
2235 | skb->data_len += (*frag)->len; | |
2236 | ||
1da177e4 LT |
2237 | frag = &(*frag)->next; |
2238 | } | |
1da177e4 LT |
2239 | |
2240 | return sent; | |
1c2acffb | 2241 | } |
1da177e4 | 2242 | |
5e59b791 | 2243 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2244 | struct msghdr *msg, size_t len, |
2245 | u32 priority) | |
1c2acffb | 2246 | { |
8c1d787b | 2247 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2248 | struct sk_buff *skb; |
03a51213 | 2249 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2250 | struct l2cap_hdr *lh; |
2251 | ||
43b1b8df MH |
2252 | BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan, |
2253 | __le16_to_cpu(chan->psm), len, priority); | |
1c2acffb GP |
2254 | |
2255 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2256 | |
2257 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2258 | msg->msg_flags & MSG_DONTWAIT); |
2259 | if (IS_ERR(skb)) | |
2260 | return skb; | |
1c2acffb | 2261 | |
5e59b791 LAD |
2262 | skb->priority = priority; |
2263 | ||
1c2acffb GP |
2264 | /* Create L2CAP header */ |
2265 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2266 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2267 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2268 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2269 | |
0952a57a | 2270 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2271 | if (unlikely(err < 0)) { |
2272 | kfree_skb(skb); | |
2273 | return ERR_PTR(err); | |
2274 | } | |
2275 | return skb; | |
2276 | } | |
2277 | ||
5e59b791 | 2278 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2279 | struct msghdr *msg, size_t len, |
2280 | u32 priority) | |
1c2acffb | 2281 | { |
8c1d787b | 2282 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2283 | struct sk_buff *skb; |
f2ba7fae | 2284 | int err, count; |
1c2acffb GP |
2285 | struct l2cap_hdr *lh; |
2286 | ||
b4400672 | 2287 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2288 | |
f2ba7fae | 2289 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2290 | |
f2ba7fae | 2291 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2292 | msg->msg_flags & MSG_DONTWAIT); |
2293 | if (IS_ERR(skb)) | |
2294 | return skb; | |
1c2acffb | 2295 | |
5e59b791 LAD |
2296 | skb->priority = priority; |
2297 | ||
1c2acffb GP |
2298 | /* Create L2CAP header */ |
2299 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2300 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2301 | lh->len = cpu_to_le16(len); |
1c2acffb | 2302 | |
0952a57a | 2303 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2304 | if (unlikely(err < 0)) { |
2305 | kfree_skb(skb); | |
2306 | return ERR_PTR(err); | |
2307 | } | |
2308 | return skb; | |
2309 | } | |
2310 | ||
ab0ff76d | 2311 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2312 | struct msghdr *msg, size_t len, |
2313 | u16 sdulen) | |
1c2acffb | 2314 | { |
8c1d787b | 2315 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2316 | struct sk_buff *skb; |
e4ca6d98 | 2317 | int err, count, hlen; |
1c2acffb GP |
2318 | struct l2cap_hdr *lh; |
2319 | ||
b4400672 | 2320 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2321 | |
0ee0d208 GP |
2322 | if (!conn) |
2323 | return ERR_PTR(-ENOTCONN); | |
2324 | ||
ba7aa64f | 2325 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2326 | |
c74e560c | 2327 | if (sdulen) |
03a51213 | 2328 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2329 | |
47d1ec61 | 2330 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2331 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2332 | |
1c2acffb | 2333 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2334 | |
2335 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2336 | msg->msg_flags & MSG_DONTWAIT); |
2337 | if (IS_ERR(skb)) | |
2338 | return skb; | |
1c2acffb GP |
2339 | |
2340 | /* Create L2CAP header */ | |
2341 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2342 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2343 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2344 | |
18a48e76 MM |
2345 | /* Control header is populated later */ |
2346 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2347 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2348 | else | |
2349 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2350 | |
c74e560c | 2351 | if (sdulen) |
03a51213 | 2352 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2353 | |
0952a57a | 2354 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2355 | if (unlikely(err < 0)) { |
2356 | kfree_skb(skb); | |
2357 | return ERR_PTR(err); | |
2358 | } | |
e90bac06 | 2359 | |
18a48e76 | 2360 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2361 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2362 | return skb; |
1da177e4 LT |
2363 | } |
2364 | ||
94122bbe MM |
2365 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2366 | struct sk_buff_head *seg_queue, | |
2367 | struct msghdr *msg, size_t len) | |
c74e560c | 2368 | { |
c74e560c | 2369 | struct sk_buff *skb; |
94122bbe MM |
2370 | u16 sdu_len; |
2371 | size_t pdu_len; | |
94122bbe | 2372 | u8 sar; |
c74e560c | 2373 | |
b4400672 | 2374 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2375 | |
94122bbe MM |
2376 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2377 | * so fragmented skbs are not used. The HCI layer's handling | |
2378 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2379 | */ | |
c74e560c | 2380 | |
94122bbe MM |
2381 | /* PDU size is derived from the HCI MTU */ |
2382 | pdu_len = chan->conn->mtu; | |
c74e560c | 2383 | |
a549574d MM |
2384 | /* Constrain PDU size for BR/EDR connections */ |
2385 | if (!chan->hs_hcon) | |
2386 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2387 | |
2388 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2389 | if (chan->fcs) |
2390 | pdu_len -= L2CAP_FCS_SIZE; | |
2391 | ||
ba7aa64f | 2392 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2393 | |
2394 | /* Remote device may have requested smaller PDUs */ | |
2395 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2396 | ||
2397 | if (len <= pdu_len) { | |
2398 | sar = L2CAP_SAR_UNSEGMENTED; | |
2399 | sdu_len = 0; | |
2400 | pdu_len = len; | |
2401 | } else { | |
2402 | sar = L2CAP_SAR_START; | |
2403 | sdu_len = len; | |
2404 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2405 | } | |
2406 | ||
2407 | while (len > 0) { | |
2408 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2409 | |
c74e560c | 2410 | if (IS_ERR(skb)) { |
94122bbe | 2411 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2412 | return PTR_ERR(skb); |
2413 | } | |
2414 | ||
94122bbe MM |
2415 | bt_cb(skb)->control.sar = sar; |
2416 | __skb_queue_tail(seg_queue, skb); | |
2417 | ||
2418 | len -= pdu_len; | |
2419 | if (sdu_len) { | |
2420 | sdu_len = 0; | |
2421 | pdu_len += L2CAP_SDULEN_SIZE; | |
2422 | } | |
2423 | ||
2424 | if (len <= pdu_len) { | |
2425 | sar = L2CAP_SAR_END; | |
2426 | pdu_len = len; | |
2427 | } else { | |
2428 | sar = L2CAP_SAR_CONTINUE; | |
2429 | } | |
c74e560c | 2430 | } |
c74e560c | 2431 | |
f0f62799 | 2432 | return 0; |
c74e560c GP |
2433 | } |
2434 | ||
5e59b791 | 2435 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2436 | u32 priority) |
9a91a04a | 2437 | { |
9a91a04a | 2438 | struct sk_buff *skb; |
9a91a04a | 2439 | int err; |
94122bbe | 2440 | struct sk_buff_head seg_queue; |
9a91a04a | 2441 | |
31e8ce80 SWK |
2442 | if (!chan->conn) |
2443 | return -ENOTCONN; | |
2444 | ||
9a91a04a | 2445 | /* Connectionless channel */ |
715ec005 | 2446 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2447 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2448 | if (IS_ERR(skb)) |
2449 | return PTR_ERR(skb); | |
2450 | ||
2451 | l2cap_do_send(chan, skb); | |
2452 | return len; | |
2453 | } | |
2454 | ||
2455 | switch (chan->mode) { | |
2456 | case L2CAP_MODE_BASIC: | |
2457 | /* Check outgoing MTU */ | |
2458 | if (len > chan->omtu) | |
2459 | return -EMSGSIZE; | |
2460 | ||
2461 | /* Create a basic PDU */ | |
5e59b791 | 2462 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2463 | if (IS_ERR(skb)) |
2464 | return PTR_ERR(skb); | |
2465 | ||
2466 | l2cap_do_send(chan, skb); | |
2467 | err = len; | |
2468 | break; | |
2469 | ||
2470 | case L2CAP_MODE_ERTM: | |
2471 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2472 | /* Check outgoing MTU */ |
2473 | if (len > chan->omtu) { | |
2474 | err = -EMSGSIZE; | |
2475 | break; | |
2476 | } | |
9a91a04a | 2477 | |
94122bbe | 2478 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2479 | |
94122bbe MM |
2480 | /* Do segmentation before calling in to the state machine, |
2481 | * since it's possible to block while waiting for memory | |
2482 | * allocation. | |
2483 | */ | |
2484 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2485 | |
94122bbe MM |
2486 | /* The channel could have been closed while segmenting, |
2487 | * check that it is still connected. | |
2488 | */ | |
2489 | if (chan->state != BT_CONNECTED) { | |
2490 | __skb_queue_purge(&seg_queue); | |
2491 | err = -ENOTCONN; | |
9a91a04a GP |
2492 | } |
2493 | ||
94122bbe | 2494 | if (err) |
9a91a04a | 2495 | break; |
9a91a04a | 2496 | |
3733937d | 2497 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2498 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2499 | else |
d660366d | 2500 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2501 | |
d660366d | 2502 | err = len; |
9a91a04a | 2503 | |
94122bbe MM |
2504 | /* If the skbs were not queued for sending, they'll still be in |
2505 | * seg_queue and need to be purged. | |
2506 | */ | |
2507 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2508 | break; |
2509 | ||
2510 | default: | |
2511 | BT_DBG("bad state %1.1x", chan->mode); | |
2512 | err = -EBADFD; | |
2513 | } | |
2514 | ||
2515 | return err; | |
2516 | } | |
2517 | ||
d2a7ac5d MM |
2518 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2519 | { | |
bed68bde MM |
2520 | struct l2cap_ctrl control; |
2521 | u16 seq; | |
2522 | ||
b4400672 | 2523 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2524 | |
2525 | memset(&control, 0, sizeof(control)); | |
2526 | control.sframe = 1; | |
2527 | control.super = L2CAP_SUPER_SREJ; | |
2528 | ||
2529 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2530 | seq = __next_seq(chan, seq)) { | |
2531 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2532 | control.reqseq = seq; | |
2533 | l2cap_send_sframe(chan, &control); | |
2534 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2535 | } | |
2536 | } | |
2537 | ||
2538 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2539 | } |
2540 | ||
2541 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2542 | { | |
bed68bde MM |
2543 | struct l2cap_ctrl control; |
2544 | ||
2545 | BT_DBG("chan %p", chan); | |
2546 | ||
2547 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2548 | return; | |
2549 | ||
2550 | memset(&control, 0, sizeof(control)); | |
2551 | control.sframe = 1; | |
2552 | control.super = L2CAP_SUPER_SREJ; | |
2553 | control.reqseq = chan->srej_list.tail; | |
2554 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2555 | } |
2556 | ||
2557 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2558 | { | |
bed68bde MM |
2559 | struct l2cap_ctrl control; |
2560 | u16 initial_head; | |
2561 | u16 seq; | |
2562 | ||
b4400672 | 2563 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2564 | |
2565 | memset(&control, 0, sizeof(control)); | |
2566 | control.sframe = 1; | |
2567 | control.super = L2CAP_SUPER_SREJ; | |
2568 | ||
2569 | /* Capture initial list head to allow only one pass through the list. */ | |
2570 | initial_head = chan->srej_list.head; | |
2571 | ||
2572 | do { | |
2573 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2574 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2575 | break; | |
2576 | ||
2577 | control.reqseq = seq; | |
2578 | l2cap_send_sframe(chan, &control); | |
2579 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2580 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2581 | } |
2582 | ||
608bcc6d MM |
2583 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2584 | { | |
2585 | struct sk_buff *acked_skb; | |
2586 | u16 ackseq; | |
2587 | ||
b4400672 | 2588 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2589 | |
2590 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2591 | return; | |
2592 | ||
b4400672 | 2593 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2594 | chan->expected_ack_seq, chan->unacked_frames); |
2595 | ||
2596 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2597 | ackseq = __next_seq(chan, ackseq)) { | |
2598 | ||
2599 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2600 | if (acked_skb) { | |
2601 | skb_unlink(acked_skb, &chan->tx_q); | |
2602 | kfree_skb(acked_skb); | |
2603 | chan->unacked_frames--; | |
2604 | } | |
2605 | } | |
2606 | ||
2607 | chan->expected_ack_seq = reqseq; | |
2608 | ||
2609 | if (chan->unacked_frames == 0) | |
2610 | __clear_retrans_timer(chan); | |
2611 | ||
b4400672 | 2612 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2613 | } |
2614 | ||
2615 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2616 | { | |
2617 | BT_DBG("chan %p", chan); | |
2618 | ||
2619 | chan->expected_tx_seq = chan->buffer_seq; | |
2620 | l2cap_seq_list_clear(&chan->srej_list); | |
2621 | skb_queue_purge(&chan->srej_q); | |
2622 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2623 | } | |
2624 | ||
d660366d GP |
2625 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2626 | struct l2cap_ctrl *control, | |
2627 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2628 | { |
608bcc6d MM |
2629 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2630 | event); | |
2631 | ||
2632 | switch (event) { | |
2633 | case L2CAP_EV_DATA_REQUEST: | |
2634 | if (chan->tx_send_head == NULL) | |
2635 | chan->tx_send_head = skb_peek(skbs); | |
2636 | ||
2637 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2638 | l2cap_ertm_send(chan); | |
2639 | break; | |
2640 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2641 | BT_DBG("Enter LOCAL_BUSY"); | |
2642 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2643 | ||
2644 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2645 | /* The SREJ_SENT state must be aborted if we are to | |
2646 | * enter the LOCAL_BUSY state. | |
2647 | */ | |
2648 | l2cap_abort_rx_srej_sent(chan); | |
2649 | } | |
2650 | ||
2651 | l2cap_send_ack(chan); | |
2652 | ||
2653 | break; | |
2654 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2655 | BT_DBG("Exit LOCAL_BUSY"); | |
2656 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2657 | ||
2658 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2659 | struct l2cap_ctrl local_control; | |
2660 | ||
2661 | memset(&local_control, 0, sizeof(local_control)); | |
2662 | local_control.sframe = 1; | |
2663 | local_control.super = L2CAP_SUPER_RR; | |
2664 | local_control.poll = 1; | |
2665 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2666 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2667 | |
2668 | chan->retry_count = 1; | |
2669 | __set_monitor_timer(chan); | |
2670 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2671 | } | |
2672 | break; | |
2673 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2674 | l2cap_process_reqseq(chan, control->reqseq); | |
2675 | break; | |
2676 | case L2CAP_EV_EXPLICIT_POLL: | |
2677 | l2cap_send_rr_or_rnr(chan, 1); | |
2678 | chan->retry_count = 1; | |
2679 | __set_monitor_timer(chan); | |
2680 | __clear_ack_timer(chan); | |
2681 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2682 | break; | |
2683 | case L2CAP_EV_RETRANS_TO: | |
2684 | l2cap_send_rr_or_rnr(chan, 1); | |
2685 | chan->retry_count = 1; | |
2686 | __set_monitor_timer(chan); | |
2687 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2688 | break; | |
2689 | case L2CAP_EV_RECV_FBIT: | |
2690 | /* Nothing to process */ | |
2691 | break; | |
2692 | default: | |
2693 | break; | |
2694 | } | |
608bcc6d MM |
2695 | } |
2696 | ||
d660366d GP |
2697 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2698 | struct l2cap_ctrl *control, | |
2699 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2700 | { |
608bcc6d MM |
2701 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2702 | event); | |
2703 | ||
2704 | switch (event) { | |
2705 | case L2CAP_EV_DATA_REQUEST: | |
2706 | if (chan->tx_send_head == NULL) | |
2707 | chan->tx_send_head = skb_peek(skbs); | |
2708 | /* Queue data, but don't send. */ | |
2709 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2710 | break; | |
2711 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2712 | BT_DBG("Enter LOCAL_BUSY"); | |
2713 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2714 | ||
2715 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2716 | /* The SREJ_SENT state must be aborted if we are to | |
2717 | * enter the LOCAL_BUSY state. | |
2718 | */ | |
2719 | l2cap_abort_rx_srej_sent(chan); | |
2720 | } | |
2721 | ||
2722 | l2cap_send_ack(chan); | |
2723 | ||
2724 | break; | |
2725 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2726 | BT_DBG("Exit LOCAL_BUSY"); | |
2727 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2728 | ||
2729 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2730 | struct l2cap_ctrl local_control; | |
2731 | memset(&local_control, 0, sizeof(local_control)); | |
2732 | local_control.sframe = 1; | |
2733 | local_control.super = L2CAP_SUPER_RR; | |
2734 | local_control.poll = 1; | |
2735 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2736 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2737 | |
2738 | chan->retry_count = 1; | |
2739 | __set_monitor_timer(chan); | |
2740 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2741 | } | |
2742 | break; | |
2743 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2744 | l2cap_process_reqseq(chan, control->reqseq); | |
2745 | ||
2746 | /* Fall through */ | |
2747 | ||
2748 | case L2CAP_EV_RECV_FBIT: | |
2749 | if (control && control->final) { | |
2750 | __clear_monitor_timer(chan); | |
2751 | if (chan->unacked_frames > 0) | |
2752 | __set_retrans_timer(chan); | |
2753 | chan->retry_count = 0; | |
2754 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2755 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2756 | } | |
2757 | break; | |
2758 | case L2CAP_EV_EXPLICIT_POLL: | |
2759 | /* Ignore */ | |
2760 | break; | |
2761 | case L2CAP_EV_MONITOR_TO: | |
2762 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2763 | l2cap_send_rr_or_rnr(chan, 1); | |
2764 | __set_monitor_timer(chan); | |
2765 | chan->retry_count++; | |
2766 | } else { | |
5e4e3972 | 2767 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2768 | } |
2769 | break; | |
2770 | default: | |
2771 | break; | |
2772 | } | |
608bcc6d MM |
2773 | } |
2774 | ||
d660366d GP |
2775 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2776 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2777 | { |
608bcc6d MM |
2778 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2779 | chan, control, skbs, event, chan->tx_state); | |
2780 | ||
2781 | switch (chan->tx_state) { | |
2782 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2783 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2784 | break; |
2785 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2786 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2787 | break; |
2788 | default: | |
2789 | /* Ignore event */ | |
2790 | break; | |
2791 | } | |
608bcc6d MM |
2792 | } |
2793 | ||
4b51dae9 MM |
2794 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2795 | struct l2cap_ctrl *control) | |
2796 | { | |
2797 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2798 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2799 | } |
2800 | ||
f80842a8 MM |
2801 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2802 | struct l2cap_ctrl *control) | |
2803 | { | |
2804 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2805 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2806 | } |
2807 | ||
1da177e4 LT |
2808 | /* Copy frame to all raw sockets on that connection */ |
2809 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2810 | { | |
1da177e4 | 2811 | struct sk_buff *nskb; |
48454079 | 2812 | struct l2cap_chan *chan; |
1da177e4 LT |
2813 | |
2814 | BT_DBG("conn %p", conn); | |
2815 | ||
3df91ea2 | 2816 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2817 | |
3df91ea2 | 2818 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2819 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2820 | continue; |
2821 | ||
7f5396a7 GP |
2822 | /* Don't send frame to the channel it came from */ |
2823 | if (bt_cb(skb)->chan == chan) | |
1da177e4 | 2824 | continue; |
7f5396a7 | 2825 | |
8bcde1f2 | 2826 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2827 | if (!nskb) |
1da177e4 | 2828 | continue; |
80b98027 | 2829 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2830 | kfree_skb(nskb); |
2831 | } | |
3d57dc68 | 2832 | |
3df91ea2 | 2833 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2834 | } |
2835 | ||
2836 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2837 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2838 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2839 | { |
2840 | struct sk_buff *skb, **frag; | |
2841 | struct l2cap_cmd_hdr *cmd; | |
2842 | struct l2cap_hdr *lh; | |
2843 | int len, count; | |
2844 | ||
b4400672 AE |
2845 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2846 | conn, code, ident, dlen); | |
1da177e4 | 2847 | |
300b962e AL |
2848 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2849 | return NULL; | |
2850 | ||
1da177e4 LT |
2851 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2852 | count = min_t(unsigned int, conn->mtu, len); | |
2853 | ||
8bcde1f2 | 2854 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2855 | if (!skb) |
2856 | return NULL; | |
2857 | ||
2858 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2859 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2860 | |
2861 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2862 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2863 | else |
ac73498c | 2864 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2865 | |
2866 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2867 | cmd->code = code; | |
2868 | cmd->ident = ident; | |
aca3192c | 2869 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2870 | |
2871 | if (dlen) { | |
2872 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2873 | memcpy(skb_put(skb, count), data, count); | |
2874 | data += count; | |
2875 | } | |
2876 | ||
2877 | len -= skb->len; | |
2878 | ||
2879 | /* Continuation fragments (no L2CAP header) */ | |
2880 | frag = &skb_shinfo(skb)->frag_list; | |
2881 | while (len) { | |
2882 | count = min_t(unsigned int, conn->mtu, len); | |
2883 | ||
8bcde1f2 | 2884 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2885 | if (!*frag) |
2886 | goto fail; | |
2887 | ||
2888 | memcpy(skb_put(*frag, count), data, count); | |
2889 | ||
2890 | len -= count; | |
2891 | data += count; | |
2892 | ||
2893 | frag = &(*frag)->next; | |
2894 | } | |
2895 | ||
2896 | return skb; | |
2897 | ||
2898 | fail: | |
2899 | kfree_skb(skb); | |
2900 | return NULL; | |
2901 | } | |
2902 | ||
2d792818 GP |
2903 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2904 | unsigned long *val) | |
1da177e4 LT |
2905 | { |
2906 | struct l2cap_conf_opt *opt = *ptr; | |
2907 | int len; | |
2908 | ||
2909 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2910 | *ptr += len; | |
2911 | ||
2912 | *type = opt->type; | |
2913 | *olen = opt->len; | |
2914 | ||
2915 | switch (opt->len) { | |
2916 | case 1: | |
2917 | *val = *((u8 *) opt->val); | |
2918 | break; | |
2919 | ||
2920 | case 2: | |
bfaaeb3e | 2921 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2922 | break; |
2923 | ||
2924 | case 4: | |
bfaaeb3e | 2925 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2926 | break; |
2927 | ||
2928 | default: | |
2929 | *val = (unsigned long) opt->val; | |
2930 | break; | |
2931 | } | |
2932 | ||
b4400672 | 2933 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2934 | return len; |
2935 | } | |
2936 | ||
1da177e4 LT |
2937 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2938 | { | |
2939 | struct l2cap_conf_opt *opt = *ptr; | |
2940 | ||
b4400672 | 2941 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2942 | |
2943 | opt->type = type; | |
2944 | opt->len = len; | |
2945 | ||
2946 | switch (len) { | |
2947 | case 1: | |
2948 | *((u8 *) opt->val) = val; | |
2949 | break; | |
2950 | ||
2951 | case 2: | |
4f8b691c | 2952 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2953 | break; |
2954 | ||
2955 | case 4: | |
4f8b691c | 2956 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2957 | break; |
2958 | ||
2959 | default: | |
2960 | memcpy(opt->val, (void *) val, len); | |
2961 | break; | |
2962 | } | |
2963 | ||
2964 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2965 | } | |
2966 | ||
f89cef09 AE |
2967 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2968 | { | |
2969 | struct l2cap_conf_efs efs; | |
2970 | ||
1ec918ce | 2971 | switch (chan->mode) { |
f89cef09 AE |
2972 | case L2CAP_MODE_ERTM: |
2973 | efs.id = chan->local_id; | |
2974 | efs.stype = chan->local_stype; | |
2975 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2976 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2977 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2978 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2979 | break; |
2980 | ||
2981 | case L2CAP_MODE_STREAMING: | |
2982 | efs.id = 1; | |
2983 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2984 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2985 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2986 | efs.acc_lat = 0; | |
2987 | efs.flush_to = 0; | |
2988 | break; | |
2989 | ||
2990 | default: | |
2991 | return; | |
2992 | } | |
2993 | ||
2994 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 2995 | (unsigned long) &efs); |
f89cef09 AE |
2996 | } |
2997 | ||
721c4181 | 2998 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2999 | { |
721c4181 | 3000 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3001 | ack_timer.work); |
3002 | u16 frames_to_ack; | |
c1b4f43b | 3003 | |
2fb9b3d4 GP |
3004 | BT_DBG("chan %p", chan); |
3005 | ||
6be36555 AE |
3006 | l2cap_chan_lock(chan); |
3007 | ||
0362520b MM |
3008 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3009 | chan->last_acked_seq); | |
6be36555 | 3010 | |
0362520b MM |
3011 | if (frames_to_ack) |
3012 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3013 | |
0362520b | 3014 | l2cap_chan_unlock(chan); |
09bfb2ee | 3015 | l2cap_chan_put(chan); |
c1b4f43b GP |
3016 | } |
3017 | ||
466f8004 | 3018 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3019 | { |
3c588192 MM |
3020 | int err; |
3021 | ||
105bdf9e MM |
3022 | chan->next_tx_seq = 0; |
3023 | chan->expected_tx_seq = 0; | |
42e5c802 | 3024 | chan->expected_ack_seq = 0; |
6a026610 | 3025 | chan->unacked_frames = 0; |
42e5c802 | 3026 | chan->buffer_seq = 0; |
6a026610 | 3027 | chan->frames_sent = 0; |
105bdf9e MM |
3028 | chan->last_acked_seq = 0; |
3029 | chan->sdu = NULL; | |
3030 | chan->sdu_last_frag = NULL; | |
3031 | chan->sdu_len = 0; | |
3032 | ||
d34c34fb MM |
3033 | skb_queue_head_init(&chan->tx_q); |
3034 | ||
6ed971ca MH |
3035 | chan->local_amp_id = AMP_ID_BREDR; |
3036 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3037 | chan->move_state = L2CAP_MOVE_STABLE; |
3038 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3039 | ||
105bdf9e MM |
3040 | if (chan->mode != L2CAP_MODE_ERTM) |
3041 | return 0; | |
3042 | ||
3043 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3044 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3045 | |
721c4181 GP |
3046 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3047 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3048 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3049 | |
f1c6775b | 3050 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3051 | |
3c588192 MM |
3052 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3053 | if (err < 0) | |
3054 | return err; | |
3055 | ||
9dc9affc MM |
3056 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3057 | if (err < 0) | |
3058 | l2cap_seq_list_free(&chan->srej_list); | |
3059 | ||
3060 | return err; | |
0565c1c2 GP |
3061 | } |
3062 | ||
f2fcfcd6 GP |
3063 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3064 | { | |
3065 | switch (mode) { | |
3066 | case L2CAP_MODE_STREAMING: | |
3067 | case L2CAP_MODE_ERTM: | |
3068 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3069 | return mode; | |
3070 | /* fall through */ | |
3071 | default: | |
3072 | return L2CAP_MODE_BASIC; | |
3073 | } | |
3074 | } | |
3075 | ||
848566b3 | 3076 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3077 | { |
848566b3 | 3078 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; |
6327eb98 AE |
3079 | } |
3080 | ||
848566b3 | 3081 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3082 | { |
848566b3 | 3083 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; |
f89cef09 AE |
3084 | } |
3085 | ||
36c86c85 MM |
3086 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3087 | struct l2cap_conf_rfc *rfc) | |
3088 | { | |
6ed971ca | 3089 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3090 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3091 | ||
3092 | /* Class 1 devices have must have ERTM timeouts | |
3093 | * exceeding the Link Supervision Timeout. The | |
3094 | * default Link Supervision Timeout for AMP | |
3095 | * controllers is 10 seconds. | |
3096 | * | |
3097 | * Class 1 devices use 0xffffffff for their | |
3098 | * best-effort flush timeout, so the clamping logic | |
3099 | * will result in a timeout that meets the above | |
3100 | * requirement. ERTM timeouts are 16-bit values, so | |
3101 | * the maximum timeout is 65.535 seconds. | |
3102 | */ | |
3103 | ||
3104 | /* Convert timeout to milliseconds and round */ | |
3105 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3106 | ||
3107 | /* This is the recommended formula for class 2 devices | |
3108 | * that start ERTM timers when packets are sent to the | |
3109 | * controller. | |
3110 | */ | |
3111 | ertm_to = 3 * ertm_to + 500; | |
3112 | ||
3113 | if (ertm_to > 0xffff) | |
3114 | ertm_to = 0xffff; | |
3115 | ||
3116 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3117 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3118 | } else { | |
3119 | rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
3120 | rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
3121 | } | |
3122 | } | |
3123 | ||
6327eb98 AE |
3124 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3125 | { | |
3126 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3127 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3128 | /* use extended control field */ |
3129 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3130 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3131 | } else { | |
6327eb98 | 3132 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3133 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3134 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3135 | } | |
c20f8e35 | 3136 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3137 | } |
3138 | ||
710f9b0a | 3139 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3140 | { |
1da177e4 | 3141 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3142 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3143 | void *ptr = req->data; |
c8f79162 | 3144 | u16 size; |
1da177e4 | 3145 | |
49208c9c | 3146 | BT_DBG("chan %p", chan); |
1da177e4 | 3147 | |
73ffa904 | 3148 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3149 | goto done; |
3150 | ||
0c1bc5c6 | 3151 | switch (chan->mode) { |
f2fcfcd6 GP |
3152 | case L2CAP_MODE_STREAMING: |
3153 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3154 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3155 | break; |
85eb53c6 | 3156 | |
848566b3 | 3157 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3158 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3159 | ||
2ba13ed6 | 3160 | /* fall through */ |
f2fcfcd6 | 3161 | default: |
8c1d787b | 3162 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3163 | break; |
3164 | } | |
3165 | ||
3166 | done: | |
0c1bc5c6 GP |
3167 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3168 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3169 | |
0c1bc5c6 | 3170 | switch (chan->mode) { |
65c7c491 | 3171 | case L2CAP_MODE_BASIC: |
8c1d787b | 3172 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3173 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3174 | break; |
3175 | ||
62547752 GP |
3176 | rfc.mode = L2CAP_MODE_BASIC; |
3177 | rfc.txwin_size = 0; | |
3178 | rfc.max_transmit = 0; | |
3179 | rfc.retrans_timeout = 0; | |
3180 | rfc.monitor_timeout = 0; | |
3181 | rfc.max_pdu_size = 0; | |
3182 | ||
63406504 | 3183 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3184 | (unsigned long) &rfc); |
65c7c491 MH |
3185 | break; |
3186 | ||
3187 | case L2CAP_MODE_ERTM: | |
3188 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3189 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3190 | |
3191 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
c8f79162 AE |
3192 | |
3193 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3194 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3195 | L2CAP_FCS_SIZE); | |
c8f79162 | 3196 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3197 | |
6327eb98 AE |
3198 | l2cap_txwin_setup(chan); |
3199 | ||
3200 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3201 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3202 | |
63406504 | 3203 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3204 | (unsigned long) &rfc); |
63406504 | 3205 | |
f89cef09 AE |
3206 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3207 | l2cap_add_opt_efs(&ptr, chan); | |
3208 | ||
6327eb98 AE |
3209 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3210 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3211 | chan->tx_win); |
60918918 AE |
3212 | |
3213 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3214 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3215 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3216 | chan->fcs = L2CAP_FCS_NONE; |
3217 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3218 | chan->fcs); | |
3219 | } | |
f2fcfcd6 GP |
3220 | break; |
3221 | ||
3222 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3223 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3224 | rfc.mode = L2CAP_MODE_STREAMING; |
3225 | rfc.txwin_size = 0; | |
3226 | rfc.max_transmit = 0; | |
3227 | rfc.retrans_timeout = 0; | |
3228 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3229 | |
3230 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3231 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3232 | L2CAP_FCS_SIZE); | |
c8f79162 | 3233 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3234 | |
63406504 | 3235 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3236 | (unsigned long) &rfc); |
63406504 | 3237 | |
f89cef09 AE |
3238 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3239 | l2cap_add_opt_efs(&ptr, chan); | |
3240 | ||
60918918 AE |
3241 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3242 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3243 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3244 | chan->fcs = L2CAP_FCS_NONE; |
3245 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3246 | chan->fcs); | |
3247 | } | |
65c7c491 MH |
3248 | break; |
3249 | } | |
1da177e4 | 3250 | |
fe4128e0 | 3251 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3252 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
3253 | |
3254 | return ptr - data; | |
3255 | } | |
3256 | ||
73ffa904 | 3257 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3258 | { |
5dee9e7c MH |
3259 | struct l2cap_conf_rsp *rsp = data; |
3260 | void *ptr = rsp->data; | |
73ffa904 GP |
3261 | void *req = chan->conf_req; |
3262 | int len = chan->conf_len; | |
5dee9e7c MH |
3263 | int type, hint, olen; |
3264 | unsigned long val; | |
6464f35f | 3265 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3266 | struct l2cap_conf_efs efs; |
3267 | u8 remote_efs = 0; | |
861d6882 | 3268 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3269 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3270 | u16 size; |
1da177e4 | 3271 | |
73ffa904 | 3272 | BT_DBG("chan %p", chan); |
820ae1b8 | 3273 | |
5dee9e7c MH |
3274 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3275 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3276 | |
589d2746 | 3277 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3278 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3279 | |
3280 | switch (type) { | |
3281 | case L2CAP_CONF_MTU: | |
861d6882 | 3282 | mtu = val; |
5dee9e7c MH |
3283 | break; |
3284 | ||
3285 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3286 | chan->flush_to = val; |
5dee9e7c MH |
3287 | break; |
3288 | ||
3289 | case L2CAP_CONF_QOS: | |
3290 | break; | |
3291 | ||
6464f35f MH |
3292 | case L2CAP_CONF_RFC: |
3293 | if (olen == sizeof(rfc)) | |
3294 | memcpy(&rfc, (void *) val, olen); | |
3295 | break; | |
3296 | ||
fcc203c3 GP |
3297 | case L2CAP_CONF_FCS: |
3298 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3299 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3300 | break; |
fcc203c3 | 3301 | |
42dceae2 AE |
3302 | case L2CAP_CONF_EFS: |
3303 | remote_efs = 1; | |
3304 | if (olen == sizeof(efs)) | |
3305 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3306 | break; |
3307 | ||
6327eb98 | 3308 | case L2CAP_CONF_EWS: |
848566b3 | 3309 | if (!chan->conn->hs_enabled) |
6327eb98 | 3310 | return -ECONNREFUSED; |
fcc203c3 | 3311 | |
6327eb98 AE |
3312 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3313 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3314 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3315 | chan->remote_tx_win = val; |
fcc203c3 GP |
3316 | break; |
3317 | ||
5dee9e7c MH |
3318 | default: |
3319 | if (hint) | |
3320 | break; | |
3321 | ||
3322 | result = L2CAP_CONF_UNKNOWN; | |
3323 | *((u8 *) ptr++) = type; | |
3324 | break; | |
3325 | } | |
3326 | } | |
3327 | ||
73ffa904 | 3328 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3329 | goto done; |
3330 | ||
0c1bc5c6 | 3331 | switch (chan->mode) { |
f2fcfcd6 GP |
3332 | case L2CAP_MODE_STREAMING: |
3333 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3334 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3335 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3336 | chan->conn->feat_mask); |
85eb53c6 GP |
3337 | break; |
3338 | } | |
3339 | ||
42dceae2 | 3340 | if (remote_efs) { |
848566b3 | 3341 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3342 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3343 | else | |
3344 | return -ECONNREFUSED; | |
3345 | } | |
3346 | ||
0c1bc5c6 | 3347 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3348 | return -ECONNREFUSED; |
742e519b | 3349 | |
f2fcfcd6 | 3350 | break; |
f2fcfcd6 GP |
3351 | } |
3352 | ||
3353 | done: | |
0c1bc5c6 | 3354 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3355 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3356 | rfc.mode = chan->mode; |
f2fcfcd6 | 3357 | |
73ffa904 | 3358 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3359 | return -ECONNREFUSED; |
3360 | ||
2d792818 GP |
3361 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3362 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3363 | } |
3364 | ||
5dee9e7c MH |
3365 | if (result == L2CAP_CONF_SUCCESS) { |
3366 | /* Configure output options and let the other side know | |
3367 | * which ones we don't like. */ | |
3368 | ||
f2fcfcd6 GP |
3369 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3370 | result = L2CAP_CONF_UNACCEPT; | |
3371 | else { | |
0c1bc5c6 | 3372 | chan->omtu = mtu; |
c1360a1c | 3373 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3374 | } |
0c1bc5c6 | 3375 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3376 | |
42dceae2 AE |
3377 | if (remote_efs) { |
3378 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3379 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3380 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3381 | |
3382 | result = L2CAP_CONF_UNACCEPT; | |
3383 | ||
3384 | if (chan->num_conf_req >= 1) | |
3385 | return -ECONNREFUSED; | |
3386 | ||
3387 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3388 | sizeof(efs), |
3389 | (unsigned long) &efs); | |
0e8b207e | 3390 | } else { |
3e6b3b95 | 3391 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3392 | result = L2CAP_CONF_PENDING; |
3393 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3394 | } |
3395 | } | |
3396 | ||
f2fcfcd6 GP |
3397 | switch (rfc.mode) { |
3398 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3399 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3400 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3401 | break; |
3402 | ||
3403 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3404 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3405 | chan->remote_tx_win = rfc.txwin_size; | |
3406 | else | |
3407 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3408 | |
2c03a7a4 | 3409 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3410 | |
c8f79162 | 3411 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3412 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3413 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3414 | rfc.max_pdu_size = cpu_to_le16(size); |
3415 | chan->remote_mps = size; | |
f2fcfcd6 | 3416 | |
36c86c85 | 3417 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3418 | |
c1360a1c | 3419 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3420 | |
3421 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3422 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3423 | |
42dceae2 AE |
3424 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3425 | chan->remote_id = efs.id; | |
3426 | chan->remote_stype = efs.stype; | |
3427 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3428 | chan->remote_flush_to = | |
2d792818 | 3429 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3430 | chan->remote_acc_lat = |
2d792818 | 3431 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3432 | chan->remote_sdu_itime = |
3433 | le32_to_cpu(efs.sdu_itime); | |
3434 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3435 | sizeof(efs), |
3436 | (unsigned long) &efs); | |
42dceae2 | 3437 | } |
f2fcfcd6 GP |
3438 | break; |
3439 | ||
3440 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3441 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3442 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3443 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3444 | rfc.max_pdu_size = cpu_to_le16(size); |
3445 | chan->remote_mps = size; | |
f2fcfcd6 | 3446 | |
c1360a1c | 3447 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3448 | |
2d792818 GP |
3449 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3450 | (unsigned long) &rfc); | |
68ae6639 | 3451 | |
f2fcfcd6 GP |
3452 | break; |
3453 | ||
3454 | default: | |
5dee9e7c | 3455 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3456 | |
6464f35f | 3457 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3458 | rfc.mode = chan->mode; |
f2fcfcd6 | 3459 | } |
6464f35f | 3460 | |
f2fcfcd6 | 3461 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3462 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3463 | } |
fe4128e0 | 3464 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3465 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3466 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3467 | |
3468 | return ptr - data; | |
1da177e4 LT |
3469 | } |
3470 | ||
2d792818 GP |
3471 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3472 | void *data, u16 *result) | |
f2fcfcd6 | 3473 | { |
f2fcfcd6 GP |
3474 | struct l2cap_conf_req *req = data; |
3475 | void *ptr = req->data; | |
3476 | int type, olen; | |
3477 | unsigned long val; | |
36e999a8 | 3478 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3479 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3480 | |
fe4128e0 | 3481 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3482 | |
3483 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3484 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3485 | ||
3486 | switch (type) { | |
3487 | case L2CAP_CONF_MTU: | |
3488 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3489 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3490 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3491 | } else |
0c1bc5c6 GP |
3492 | chan->imtu = val; |
3493 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3494 | break; |
3495 | ||
3496 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3497 | chan->flush_to = val; |
f2fcfcd6 | 3498 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3499 | 2, chan->flush_to); |
f2fcfcd6 GP |
3500 | break; |
3501 | ||
3502 | case L2CAP_CONF_RFC: | |
3503 | if (olen == sizeof(rfc)) | |
3504 | memcpy(&rfc, (void *)val, olen); | |
3505 | ||
c1360a1c | 3506 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3507 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3508 | return -ECONNREFUSED; |
3509 | ||
47d1ec61 | 3510 | chan->fcs = 0; |
f2fcfcd6 GP |
3511 | |
3512 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3513 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3514 | break; |
6327eb98 AE |
3515 | |
3516 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3517 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3518 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3519 | chan->tx_win); |
6327eb98 | 3520 | break; |
66af7aaf AE |
3521 | |
3522 | case L2CAP_CONF_EFS: | |
3523 | if (olen == sizeof(efs)) | |
3524 | memcpy(&efs, (void *)val, olen); | |
3525 | ||
3526 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3527 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3528 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3529 | return -ECONNREFUSED; |
3530 | ||
2d792818 GP |
3531 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3532 | (unsigned long) &efs); | |
66af7aaf | 3533 | break; |
cbabee78 AE |
3534 | |
3535 | case L2CAP_CONF_FCS: | |
3536 | if (*result == L2CAP_CONF_PENDING) | |
3537 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3538 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3539 | &chan->conf_state); |
3540 | break; | |
f2fcfcd6 GP |
3541 | } |
3542 | } | |
3543 | ||
0c1bc5c6 | 3544 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3545 | return -ECONNREFUSED; |
3546 | ||
0c1bc5c6 | 3547 | chan->mode = rfc.mode; |
6c2ea7a8 | 3548 | |
0e8b207e | 3549 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3550 | switch (rfc.mode) { |
3551 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3552 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3553 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3554 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3555 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3556 | chan->ack_win = min_t(u16, chan->ack_win, | |
3557 | rfc.txwin_size); | |
66af7aaf AE |
3558 | |
3559 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3560 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3561 | chan->local_sdu_itime = | |
2d792818 | 3562 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3563 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3564 | chan->local_flush_to = | |
2d792818 | 3565 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3566 | } |
f2fcfcd6 | 3567 | break; |
66af7aaf | 3568 | |
f2fcfcd6 | 3569 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3570 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3571 | } |
3572 | } | |
3573 | ||
fe4128e0 | 3574 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3575 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3576 | |
3577 | return ptr - data; | |
3578 | } | |
3579 | ||
2d792818 GP |
3580 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3581 | u16 result, u16 flags) | |
1da177e4 LT |
3582 | { |
3583 | struct l2cap_conf_rsp *rsp = data; | |
3584 | void *ptr = rsp->data; | |
1da177e4 | 3585 | |
fe4128e0 | 3586 | BT_DBG("chan %p", chan); |
1da177e4 | 3587 | |
fe4128e0 | 3588 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3589 | rsp->result = cpu_to_le16(result); |
aca3192c | 3590 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3591 | |
3592 | return ptr - data; | |
3593 | } | |
3594 | ||
8c1d787b | 3595 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3596 | { |
3597 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3598 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3599 | u8 buf[128]; |
439f34ac | 3600 | u8 rsp_code; |
710f9b0a | 3601 | |
fe4128e0 GP |
3602 | rsp.scid = cpu_to_le16(chan->dcid); |
3603 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3604 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3605 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3606 | |
3607 | if (chan->hs_hcon) | |
3608 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3609 | else | |
3610 | rsp_code = L2CAP_CONN_RSP; | |
3611 | ||
3612 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3613 | ||
3614 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3615 | |
c1360a1c | 3616 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3617 | return; |
3618 | ||
710f9b0a | 3619 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3620 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3621 | chan->num_conf_req++; |
3622 | } | |
3623 | ||
47d1ec61 | 3624 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3625 | { |
7b1c0049 GP |
3626 | int type, olen; |
3627 | unsigned long val; | |
c20f8e35 MM |
3628 | /* Use sane default values in case a misbehaving remote device |
3629 | * did not send an RFC or extended window size option. | |
3630 | */ | |
3631 | u16 txwin_ext = chan->ack_win; | |
3632 | struct l2cap_conf_rfc rfc = { | |
3633 | .mode = chan->mode, | |
3634 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3635 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3636 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3637 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3638 | }; | |
7b1c0049 | 3639 | |
47d1ec61 | 3640 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3641 | |
0c1bc5c6 | 3642 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3643 | return; |
3644 | ||
3645 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3646 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3647 | ||
c20f8e35 MM |
3648 | switch (type) { |
3649 | case L2CAP_CONF_RFC: | |
3650 | if (olen == sizeof(rfc)) | |
3651 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3652 | break; |
c20f8e35 MM |
3653 | case L2CAP_CONF_EWS: |
3654 | txwin_ext = val; | |
3655 | break; | |
3656 | } | |
7b1c0049 GP |
3657 | } |
3658 | ||
7b1c0049 GP |
3659 | switch (rfc.mode) { |
3660 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3661 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3662 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3663 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3664 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3665 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3666 | else | |
3667 | chan->ack_win = min_t(u16, chan->ack_win, | |
3668 | rfc.txwin_size); | |
7b1c0049 GP |
3669 | break; |
3670 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3671 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3672 | } |
3673 | } | |
3674 | ||
2d792818 | 3675 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3676 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3677 | u8 *data) | |
4e8402a3 | 3678 | { |
e2fd318e | 3679 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3680 | |
cb3b3152 JH |
3681 | if (cmd_len < sizeof(*rej)) |
3682 | return -EPROTO; | |
3683 | ||
e2fd318e | 3684 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3685 | return 0; |
3686 | ||
3687 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3688 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3689 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3690 | |
3691 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3692 | conn->info_ident = 0; |
984947dc | 3693 | |
4e8402a3 MH |
3694 | l2cap_conn_start(conn); |
3695 | } | |
3696 | ||
3697 | return 0; | |
3698 | } | |
3699 | ||
1700915f MM |
3700 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3701 | struct l2cap_cmd_hdr *cmd, | |
3702 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3703 | { |
1da177e4 LT |
3704 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3705 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3706 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3707 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3708 | |
3709 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3710 | __le16 psm = req->psm; |
1da177e4 | 3711 | |
097db76c | 3712 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3713 | |
3714 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3715 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
98e0f7ea | 3716 | &conn->hcon->dst); |
23691d75 | 3717 | if (!pchan) { |
1da177e4 LT |
3718 | result = L2CAP_CR_BAD_PSM; |
3719 | goto sendresp; | |
3720 | } | |
3721 | ||
3df91ea2 | 3722 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3723 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3724 | |
e7c29cb1 | 3725 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3726 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3727 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3728 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3729 | result = L2CAP_CR_SEC_BLOCK; |
3730 | goto response; | |
3731 | } | |
3732 | ||
1da177e4 LT |
3733 | result = L2CAP_CR_NO_MEM; |
3734 | ||
2dfa1003 GP |
3735 | /* Check if we already have channel with that dcid */ |
3736 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3737 | goto response; | |
3738 | ||
80b98027 | 3739 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3740 | if (!chan) |
1da177e4 LT |
3741 | goto response; |
3742 | ||
330b6c15 SS |
3743 | /* For certain devices (ex: HID mouse), support for authentication, |
3744 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3745 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3746 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3747 | */ | |
3748 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3749 | ||
7eafc59e MH |
3750 | bacpy(&chan->src, &conn->hcon->src); |
3751 | bacpy(&chan->dst, &conn->hcon->dst); | |
4f1654e0 MH |
3752 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); |
3753 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
fe4128e0 GP |
3754 | chan->psm = psm; |
3755 | chan->dcid = scid; | |
1700915f | 3756 | chan->local_amp_id = amp_id; |
1da177e4 | 3757 | |
6be36555 | 3758 | __l2cap_chan_add(conn, chan); |
48454079 | 3759 | |
fe4128e0 | 3760 | dcid = chan->scid; |
1da177e4 | 3761 | |
8d836d71 | 3762 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3763 | |
fc7f8a7e | 3764 | chan->ident = cmd->ident; |
1da177e4 | 3765 | |
984947dc | 3766 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3767 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 3768 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3769 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3770 | result = L2CAP_CR_PEND; |
3771 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3772 | chan->ops->defer(chan); |
f66dc81f | 3773 | } else { |
1700915f MM |
3774 | /* Force pending result for AMP controllers. |
3775 | * The connection will succeed after the | |
3776 | * physical link is up. | |
3777 | */ | |
6ed971ca | 3778 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3779 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3780 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3781 | } else { |
f93fa273 | 3782 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3783 | result = L2CAP_CR_PEND; |
1700915f | 3784 | } |
f66dc81f MH |
3785 | status = L2CAP_CS_NO_INFO; |
3786 | } | |
79d554a6 | 3787 | } else { |
f93fa273 | 3788 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3789 | result = L2CAP_CR_PEND; |
3790 | status = L2CAP_CS_AUTHEN_PEND; | |
3791 | } | |
3792 | } else { | |
f93fa273 | 3793 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3794 | result = L2CAP_CR_PEND; |
3795 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3796 | } |
3797 | ||
1da177e4 | 3798 | response: |
8ffb9290 | 3799 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3800 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3801 | |
3802 | sendresp: | |
aca3192c YH |
3803 | rsp.scid = cpu_to_le16(scid); |
3804 | rsp.dcid = cpu_to_le16(dcid); | |
3805 | rsp.result = cpu_to_le16(result); | |
3806 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3807 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3808 | |
3809 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3810 | struct l2cap_info_req info; | |
ac73498c | 3811 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3812 | |
3813 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3814 | conn->info_ident = l2cap_get_ident(conn); | |
3815 | ||
ba13ccd9 | 3816 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3817 | |
2d792818 GP |
3818 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3819 | sizeof(info), &info); | |
79d554a6 MH |
3820 | } |
3821 | ||
c1360a1c | 3822 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3823 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3824 | u8 buf[128]; |
c1360a1c | 3825 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3826 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3827 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3828 | chan->num_conf_req++; |
e9aeb2dd | 3829 | } |
1700915f MM |
3830 | |
3831 | return chan; | |
4c89b6aa | 3832 | } |
e9aeb2dd | 3833 | |
4c89b6aa | 3834 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3835 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3836 | { |
7b064eda JK |
3837 | struct hci_dev *hdev = conn->hcon->hdev; |
3838 | struct hci_conn *hcon = conn->hcon; | |
3839 | ||
cb3b3152 JH |
3840 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3841 | return -EPROTO; | |
3842 | ||
7b064eda JK |
3843 | hci_dev_lock(hdev); |
3844 | if (test_bit(HCI_MGMT, &hdev->dev_flags) && | |
3845 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) | |
3846 | mgmt_device_connected(hdev, &hcon->dst, hcon->type, | |
3847 | hcon->dst_type, 0, NULL, 0, | |
3848 | hcon->dev_class); | |
3849 | hci_dev_unlock(hdev); | |
3850 | ||
300229f9 | 3851 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3852 | return 0; |
3853 | } | |
3854 | ||
5909cf30 | 3855 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3856 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3857 | u8 *data) | |
1da177e4 LT |
3858 | { |
3859 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3860 | u16 scid, dcid, result, status; | |
48454079 | 3861 | struct l2cap_chan *chan; |
1da177e4 | 3862 | u8 req[128]; |
3df91ea2 | 3863 | int err; |
1da177e4 | 3864 | |
cb3b3152 JH |
3865 | if (cmd_len < sizeof(*rsp)) |
3866 | return -EPROTO; | |
3867 | ||
1da177e4 LT |
3868 | scid = __le16_to_cpu(rsp->scid); |
3869 | dcid = __le16_to_cpu(rsp->dcid); | |
3870 | result = __le16_to_cpu(rsp->result); | |
3871 | status = __le16_to_cpu(rsp->status); | |
3872 | ||
1b009c98 | 3873 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3874 | dcid, scid, result, status); |
1da177e4 | 3875 | |
3df91ea2 AE |
3876 | mutex_lock(&conn->chan_lock); |
3877 | ||
1da177e4 | 3878 | if (scid) { |
3df91ea2 AE |
3879 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3880 | if (!chan) { | |
21870b52 | 3881 | err = -EBADSLT; |
3df91ea2 AE |
3882 | goto unlock; |
3883 | } | |
1da177e4 | 3884 | } else { |
3df91ea2 AE |
3885 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3886 | if (!chan) { | |
21870b52 | 3887 | err = -EBADSLT; |
3df91ea2 AE |
3888 | goto unlock; |
3889 | } | |
1da177e4 LT |
3890 | } |
3891 | ||
3df91ea2 AE |
3892 | err = 0; |
3893 | ||
6be36555 | 3894 | l2cap_chan_lock(chan); |
48454079 | 3895 | |
1da177e4 LT |
3896 | switch (result) { |
3897 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3898 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3899 | chan->ident = 0; |
fe4128e0 | 3900 | chan->dcid = dcid; |
c1360a1c | 3901 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3902 | |
c1360a1c | 3903 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3904 | break; |
3905 | ||
1da177e4 | 3906 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3907 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3908 | chan->num_conf_req++; |
1da177e4 LT |
3909 | break; |
3910 | ||
3911 | case L2CAP_CR_PEND: | |
c1360a1c | 3912 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3913 | break; |
3914 | ||
3915 | default: | |
48454079 | 3916 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3917 | break; |
3918 | } | |
3919 | ||
6be36555 | 3920 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3921 | |
3922 | unlock: | |
3923 | mutex_unlock(&conn->chan_lock); | |
3924 | ||
3925 | return err; | |
1da177e4 LT |
3926 | } |
3927 | ||
47d1ec61 | 3928 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3929 | { |
3930 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3931 | * sides request it. | |
3932 | */ | |
0c1bc5c6 | 3933 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3934 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 3935 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 3936 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3937 | } |
3938 | ||
29d8a590 AE |
3939 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3940 | u8 ident, u16 flags) | |
3941 | { | |
3942 | struct l2cap_conn *conn = chan->conn; | |
3943 | ||
3944 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3945 | flags); | |
3946 | ||
3947 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3948 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3949 | ||
3950 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3951 | l2cap_build_conf_rsp(chan, data, | |
3952 | L2CAP_CONF_SUCCESS, flags), data); | |
3953 | } | |
3954 | ||
662d652d JH |
3955 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
3956 | u16 scid, u16 dcid) | |
3957 | { | |
3958 | struct l2cap_cmd_rej_cid rej; | |
3959 | ||
3960 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
3961 | rej.scid = __cpu_to_le16(scid); | |
3962 | rej.dcid = __cpu_to_le16(dcid); | |
3963 | ||
3964 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
3965 | } | |
3966 | ||
2d792818 GP |
3967 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3968 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3969 | u8 *data) | |
1da177e4 LT |
3970 | { |
3971 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3972 | u16 dcid, flags; | |
3973 | u8 rsp[64]; | |
48454079 | 3974 | struct l2cap_chan *chan; |
3c588192 | 3975 | int len, err = 0; |
1da177e4 | 3976 | |
cb3b3152 JH |
3977 | if (cmd_len < sizeof(*req)) |
3978 | return -EPROTO; | |
3979 | ||
1da177e4 LT |
3980 | dcid = __le16_to_cpu(req->dcid); |
3981 | flags = __le16_to_cpu(req->flags); | |
3982 | ||
3983 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3984 | ||
baa7e1fa | 3985 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
3986 | if (!chan) { |
3987 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
3988 | return 0; | |
3989 | } | |
1da177e4 | 3990 | |
033b1142 | 3991 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
3992 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
3993 | chan->dcid); | |
354f60a9 | 3994 | goto unlock; |
df6bd743 | 3995 | } |
354f60a9 | 3996 | |
5dee9e7c | 3997 | /* Reject if config buffer is too small. */ |
88219a0f | 3998 | len = cmd_len - sizeof(*req); |
cb3b3152 | 3999 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4000 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4001 | l2cap_build_conf_rsp(chan, rsp, |
4002 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4003 | goto unlock; |
4004 | } | |
4005 | ||
4006 | /* Store config. */ | |
73ffa904 GP |
4007 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4008 | chan->conf_len += len; | |
1da177e4 | 4009 | |
59e54bd1 | 4010 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4011 | /* Incomplete config. Send empty response. */ |
4012 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4013 | l2cap_build_conf_rsp(chan, rsp, |
4014 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4015 | goto unlock; |
4016 | } | |
4017 | ||
4018 | /* Complete config. */ | |
73ffa904 | 4019 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4020 | if (len < 0) { |
5e4e3972 | 4021 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4022 | goto unlock; |
f2fcfcd6 | 4023 | } |
1da177e4 | 4024 | |
1500109b | 4025 | chan->ident = cmd->ident; |
5dee9e7c | 4026 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4027 | chan->num_conf_rsp++; |
5dee9e7c | 4028 | |
5dee9e7c | 4029 | /* Reset config buffer. */ |
73ffa904 | 4030 | chan->conf_len = 0; |
5dee9e7c | 4031 | |
c1360a1c | 4032 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4033 | goto unlock; |
4034 | ||
c1360a1c | 4035 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4036 | set_default_fcs(chan); |
fcc203c3 | 4037 | |
105bdf9e MM |
4038 | if (chan->mode == L2CAP_MODE_ERTM || |
4039 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4040 | err = l2cap_ertm_init(chan); |
4041 | ||
4042 | if (err < 0) | |
5e4e3972 | 4043 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4044 | else |
4045 | l2cap_chan_ready(chan); | |
0565c1c2 | 4046 | |
876d9484 MH |
4047 | goto unlock; |
4048 | } | |
4049 | ||
c1360a1c | 4050 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4051 | u8 buf[64]; |
1da177e4 | 4052 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4053 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4054 | chan->num_conf_req++; |
1da177e4 LT |
4055 | } |
4056 | ||
0e8b207e AE |
4057 | /* Got Conf Rsp PENDING from remote side and asume we sent |
4058 | Conf Rsp PENDING in the code above */ | |
4059 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4060 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4061 | |
4062 | /* check compatibility */ | |
4063 | ||
79de886d | 4064 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4065 | if (!chan->hs_hcon) |
79de886d AE |
4066 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4067 | else | |
4068 | chan->ident = cmd->ident; | |
0e8b207e AE |
4069 | } |
4070 | ||
1da177e4 | 4071 | unlock: |
6be36555 | 4072 | l2cap_chan_unlock(chan); |
3c588192 | 4073 | return err; |
1da177e4 LT |
4074 | } |
4075 | ||
2d792818 | 4076 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4077 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4078 | u8 *data) | |
1da177e4 LT |
4079 | { |
4080 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4081 | u16 scid, flags, result; | |
48454079 | 4082 | struct l2cap_chan *chan; |
cb3b3152 | 4083 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4084 | int err = 0; |
1da177e4 | 4085 | |
cb3b3152 JH |
4086 | if (cmd_len < sizeof(*rsp)) |
4087 | return -EPROTO; | |
4088 | ||
1da177e4 LT |
4089 | scid = __le16_to_cpu(rsp->scid); |
4090 | flags = __le16_to_cpu(rsp->flags); | |
4091 | result = __le16_to_cpu(rsp->result); | |
4092 | ||
61386cba AE |
4093 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4094 | result, len); | |
1da177e4 | 4095 | |
baa7e1fa | 4096 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4097 | if (!chan) |
1da177e4 LT |
4098 | return 0; |
4099 | ||
4100 | switch (result) { | |
4101 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4102 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4103 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4104 | break; |
4105 | ||
0e8b207e AE |
4106 | case L2CAP_CONF_PENDING: |
4107 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4108 | ||
4109 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4110 | char buf[64]; | |
4111 | ||
4112 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4113 | buf, &result); |
0e8b207e | 4114 | if (len < 0) { |
5e4e3972 | 4115 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4116 | goto done; |
4117 | } | |
4118 | ||
f351bc72 | 4119 | if (!chan->hs_hcon) { |
79de886d AE |
4120 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4121 | 0); | |
5ce66b59 AE |
4122 | } else { |
4123 | if (l2cap_check_efs(chan)) { | |
4124 | amp_create_logical_link(chan); | |
4125 | chan->ident = cmd->ident; | |
4126 | } | |
4127 | } | |
0e8b207e AE |
4128 | } |
4129 | goto done; | |
4130 | ||
1da177e4 | 4131 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4132 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4133 | char req[64]; |
4134 | ||
c2c77ec8 | 4135 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4136 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4137 | goto done; |
4138 | } | |
4139 | ||
f2fcfcd6 GP |
4140 | /* throw out any old stored conf requests */ |
4141 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4142 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4143 | req, &result); |
f2fcfcd6 | 4144 | if (len < 0) { |
5e4e3972 | 4145 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4146 | goto done; |
4147 | } | |
4148 | ||
4149 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4150 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4151 | chan->num_conf_req++; |
f2fcfcd6 GP |
4152 | if (result != L2CAP_CONF_SUCCESS) |
4153 | goto done; | |
4154 | break; | |
1da177e4 LT |
4155 | } |
4156 | ||
8e87d142 | 4157 | default: |
6be36555 | 4158 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4159 | |
ba13ccd9 | 4160 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4161 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4162 | goto done; |
4163 | } | |
4164 | ||
59e54bd1 | 4165 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4166 | goto done; |
4167 | ||
c1360a1c | 4168 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4169 | |
c1360a1c | 4170 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4171 | set_default_fcs(chan); |
fcc203c3 | 4172 | |
105bdf9e MM |
4173 | if (chan->mode == L2CAP_MODE_ERTM || |
4174 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4175 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4176 | |
3c588192 | 4177 | if (err < 0) |
5e4e3972 | 4178 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4179 | else |
4180 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4181 | } |
4182 | ||
4183 | done: | |
6be36555 | 4184 | l2cap_chan_unlock(chan); |
3c588192 | 4185 | return err; |
1da177e4 LT |
4186 | } |
4187 | ||
2d792818 | 4188 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4189 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4190 | u8 *data) | |
1da177e4 LT |
4191 | { |
4192 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4193 | struct l2cap_disconn_rsp rsp; | |
4194 | u16 dcid, scid; | |
48454079 | 4195 | struct l2cap_chan *chan; |
1da177e4 | 4196 | |
cb3b3152 JH |
4197 | if (cmd_len != sizeof(*req)) |
4198 | return -EPROTO; | |
4199 | ||
1da177e4 LT |
4200 | scid = __le16_to_cpu(req->scid); |
4201 | dcid = __le16_to_cpu(req->dcid); | |
4202 | ||
4203 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4204 | ||
3df91ea2 AE |
4205 | mutex_lock(&conn->chan_lock); |
4206 | ||
4207 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4208 | if (!chan) { | |
4209 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4210 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4211 | return 0; | |
3df91ea2 | 4212 | } |
1da177e4 | 4213 | |
6be36555 AE |
4214 | l2cap_chan_lock(chan); |
4215 | ||
fe4128e0 GP |
4216 | rsp.dcid = cpu_to_le16(chan->scid); |
4217 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4218 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4219 | ||
5ec1bbe5 | 4220 | chan->ops->set_shutdown(chan); |
1da177e4 | 4221 | |
61d6ef3e | 4222 | l2cap_chan_hold(chan); |
48454079 | 4223 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4224 | |
4225 | l2cap_chan_unlock(chan); | |
1da177e4 | 4226 | |
80b98027 | 4227 | chan->ops->close(chan); |
61d6ef3e | 4228 | l2cap_chan_put(chan); |
3df91ea2 AE |
4229 | |
4230 | mutex_unlock(&conn->chan_lock); | |
4231 | ||
1da177e4 LT |
4232 | return 0; |
4233 | } | |
4234 | ||
2d792818 | 4235 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4236 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4237 | u8 *data) | |
1da177e4 LT |
4238 | { |
4239 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4240 | u16 dcid, scid; | |
48454079 | 4241 | struct l2cap_chan *chan; |
1da177e4 | 4242 | |
cb3b3152 JH |
4243 | if (cmd_len != sizeof(*rsp)) |
4244 | return -EPROTO; | |
4245 | ||
1da177e4 LT |
4246 | scid = __le16_to_cpu(rsp->scid); |
4247 | dcid = __le16_to_cpu(rsp->dcid); | |
4248 | ||
4249 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4250 | ||
3df91ea2 AE |
4251 | mutex_lock(&conn->chan_lock); |
4252 | ||
4253 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4254 | if (!chan) { | |
4255 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4256 | return 0; |
3df91ea2 | 4257 | } |
1da177e4 | 4258 | |
6be36555 | 4259 | l2cap_chan_lock(chan); |
48454079 | 4260 | |
61d6ef3e | 4261 | l2cap_chan_hold(chan); |
48454079 | 4262 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4263 | |
4264 | l2cap_chan_unlock(chan); | |
1da177e4 | 4265 | |
80b98027 | 4266 | chan->ops->close(chan); |
61d6ef3e | 4267 | l2cap_chan_put(chan); |
3df91ea2 AE |
4268 | |
4269 | mutex_unlock(&conn->chan_lock); | |
4270 | ||
1da177e4 LT |
4271 | return 0; |
4272 | } | |
4273 | ||
2d792818 | 4274 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4275 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4276 | u8 *data) | |
1da177e4 LT |
4277 | { |
4278 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4279 | u16 type; |
4280 | ||
cb3b3152 JH |
4281 | if (cmd_len != sizeof(*req)) |
4282 | return -EPROTO; | |
4283 | ||
1da177e4 LT |
4284 | type = __le16_to_cpu(req->type); |
4285 | ||
4286 | BT_DBG("type 0x%4.4x", type); | |
4287 | ||
f0709e03 MH |
4288 | if (type == L2CAP_IT_FEAT_MASK) { |
4289 | u8 buf[8]; | |
44dd46de | 4290 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4291 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
4292 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4293 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4294 | if (!disable_ertm) |
fcc203c3 | 4295 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4296 | | L2CAP_FEAT_FCS; |
848566b3 | 4297 | if (conn->hs_enabled) |
6327eb98 | 4298 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4299 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4300 | |
1b7bf4ed | 4301 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4302 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4303 | buf); | |
e1027a7c MH |
4304 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4305 | u8 buf[12]; | |
4306 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4307 | |
848566b3 | 4308 | if (conn->hs_enabled) |
50a147cd MM |
4309 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; |
4310 | else | |
4311 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4312 | ||
ac73498c AE |
4313 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4314 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4315 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4316 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4317 | buf); | |
f0709e03 MH |
4318 | } else { |
4319 | struct l2cap_info_rsp rsp; | |
4320 | rsp.type = cpu_to_le16(type); | |
ac73498c | 4321 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4322 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4323 | &rsp); | |
f0709e03 | 4324 | } |
1da177e4 LT |
4325 | |
4326 | return 0; | |
4327 | } | |
4328 | ||
2d792818 | 4329 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4330 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4331 | u8 *data) | |
1da177e4 LT |
4332 | { |
4333 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4334 | u16 type, result; | |
4335 | ||
3f6fa3d4 | 4336 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4337 | return -EPROTO; |
4338 | ||
1da177e4 LT |
4339 | type = __le16_to_cpu(rsp->type); |
4340 | result = __le16_to_cpu(rsp->result); | |
4341 | ||
4342 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4343 | ||
e90165be AE |
4344 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4345 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4346 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4347 | return 0; |
4348 | ||
17cd3f37 | 4349 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4350 | |
adb08ede VT |
4351 | if (result != L2CAP_IR_SUCCESS) { |
4352 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4353 | conn->info_ident = 0; | |
4354 | ||
4355 | l2cap_conn_start(conn); | |
4356 | ||
4357 | return 0; | |
4358 | } | |
4359 | ||
978c93b9 AE |
4360 | switch (type) { |
4361 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4362 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4363 | |
47ec1dcd | 4364 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4365 | struct l2cap_info_req req; |
ac73498c | 4366 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4367 | |
4368 | conn->info_ident = l2cap_get_ident(conn); | |
4369 | ||
4370 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4371 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4372 | } else { |
4373 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4374 | conn->info_ident = 0; | |
4375 | ||
4376 | l2cap_conn_start(conn); | |
4377 | } | |
978c93b9 AE |
4378 | break; |
4379 | ||
4380 | case L2CAP_IT_FIXED_CHAN: | |
4381 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4382 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4383 | conn->info_ident = 0; |
984947dc MH |
4384 | |
4385 | l2cap_conn_start(conn); | |
978c93b9 | 4386 | break; |
984947dc | 4387 | } |
4e8402a3 | 4388 | |
1da177e4 LT |
4389 | return 0; |
4390 | } | |
4391 | ||
1700915f MM |
4392 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4393 | struct l2cap_cmd_hdr *cmd, | |
4394 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4395 | { |
4396 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4397 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4398 | struct l2cap_chan *chan; |
6e1df6a6 | 4399 | struct hci_dev *hdev; |
f94ff6ff MM |
4400 | u16 psm, scid; |
4401 | ||
4402 | if (cmd_len != sizeof(*req)) | |
4403 | return -EPROTO; | |
4404 | ||
848566b3 | 4405 | if (!conn->hs_enabled) |
f94ff6ff MM |
4406 | return -EINVAL; |
4407 | ||
4408 | psm = le16_to_cpu(req->psm); | |
4409 | scid = le16_to_cpu(req->scid); | |
4410 | ||
ad0ac6ca | 4411 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4412 | |
6e1df6a6 | 4413 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4414 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4415 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4416 | req->amp_id); | |
4417 | return 0; | |
4418 | } | |
1700915f | 4419 | |
6e1df6a6 AE |
4420 | /* Validate AMP controller id */ |
4421 | hdev = hci_dev_get(req->amp_id); | |
4422 | if (!hdev) | |
4423 | goto error; | |
1700915f | 4424 | |
6e1df6a6 AE |
4425 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4426 | hci_dev_put(hdev); | |
4427 | goto error; | |
4428 | } | |
1700915f | 4429 | |
6e1df6a6 AE |
4430 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4431 | req->amp_id); | |
4432 | if (chan) { | |
4433 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4434 | struct hci_conn *hs_hcon; | |
1700915f | 4435 | |
98e0f7ea MH |
4436 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4437 | &conn->hcon->dst); | |
6e1df6a6 AE |
4438 | if (!hs_hcon) { |
4439 | hci_dev_put(hdev); | |
662d652d JH |
4440 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4441 | chan->dcid); | |
4442 | return 0; | |
1700915f MM |
4443 | } |
4444 | ||
6e1df6a6 AE |
4445 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4446 | ||
6e1df6a6 AE |
4447 | mgr->bredr_chan = chan; |
4448 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4449 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4450 | conn->mtu = hdev->block_mtu; |
1700915f | 4451 | } |
f94ff6ff | 4452 | |
6e1df6a6 | 4453 | hci_dev_put(hdev); |
f94ff6ff MM |
4454 | |
4455 | return 0; | |
6e1df6a6 AE |
4456 | |
4457 | error: | |
4458 | rsp.dcid = 0; | |
4459 | rsp.scid = cpu_to_le16(scid); | |
4460 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); | |
4461 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
4462 | ||
4463 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4464 | sizeof(rsp), &rsp); | |
4465 | ||
dc280801 | 4466 | return 0; |
f94ff6ff MM |
4467 | } |
4468 | ||
8eb200bd MM |
4469 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4470 | { | |
4471 | struct l2cap_move_chan_req req; | |
4472 | u8 ident; | |
4473 | ||
4474 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4475 | ||
4476 | ident = l2cap_get_ident(chan->conn); | |
4477 | chan->ident = ident; | |
4478 | ||
4479 | req.icid = cpu_to_le16(chan->scid); | |
4480 | req.dest_amp_id = dest_amp_id; | |
4481 | ||
4482 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4483 | &req); | |
4484 | ||
4485 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4486 | } | |
4487 | ||
1500109b | 4488 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4489 | { |
4490 | struct l2cap_move_chan_rsp rsp; | |
4491 | ||
1500109b | 4492 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4493 | |
1500109b | 4494 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4495 | rsp.result = cpu_to_le16(result); |
4496 | ||
1500109b MM |
4497 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4498 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4499 | } |
4500 | ||
5b155ef9 | 4501 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4502 | { |
4503 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4504 | |
5b155ef9 | 4505 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4506 | |
5b155ef9 | 4507 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4508 | |
5b155ef9 | 4509 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4510 | cfm.result = cpu_to_le16(result); |
4511 | ||
5b155ef9 MM |
4512 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4513 | sizeof(cfm), &cfm); | |
4514 | ||
4515 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4516 | } | |
4517 | ||
4518 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4519 | { | |
4520 | struct l2cap_move_chan_cfm cfm; | |
4521 | ||
4522 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4523 | ||
4524 | cfm.icid = cpu_to_le16(icid); | |
4525 | cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); | |
4526 | ||
4527 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4528 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4529 | } |
4530 | ||
4531 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4532 | u16 icid) |
8d5a04a1 MM |
4533 | { |
4534 | struct l2cap_move_chan_cfm_rsp rsp; | |
4535 | ||
ad0ac6ca | 4536 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4537 | |
4538 | rsp.icid = cpu_to_le16(icid); | |
4539 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4540 | } | |
4541 | ||
5f3847a4 MM |
4542 | static void __release_logical_link(struct l2cap_chan *chan) |
4543 | { | |
4544 | chan->hs_hchan = NULL; | |
4545 | chan->hs_hcon = NULL; | |
4546 | ||
4547 | /* Placeholder - release the logical link */ | |
4548 | } | |
4549 | ||
1500109b MM |
4550 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4551 | { | |
4552 | /* Logical link setup failed */ | |
4553 | if (chan->state != BT_CONNECTED) { | |
4554 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4555 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4556 | return; |
4557 | } | |
4558 | ||
4559 | switch (chan->move_role) { | |
4560 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4561 | l2cap_move_done(chan); | |
4562 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4563 | break; | |
4564 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4565 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4566 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4567 | /* Remote has only sent pending or | |
4568 | * success responses, clean up | |
4569 | */ | |
4570 | l2cap_move_done(chan); | |
4571 | } | |
4572 | ||
4573 | /* Other amp move states imply that the move | |
4574 | * has already aborted | |
4575 | */ | |
4576 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4577 | break; | |
4578 | } | |
4579 | } | |
4580 | ||
4581 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4582 | struct hci_chan *hchan) | |
4583 | { | |
4584 | struct l2cap_conf_rsp rsp; | |
1500109b | 4585 | |
336178a3 | 4586 | chan->hs_hchan = hchan; |
1500109b MM |
4587 | chan->hs_hcon->l2cap_data = chan->conn; |
4588 | ||
35ba9561 | 4589 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4590 | |
4591 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4592 | int err; |
1500109b MM |
4593 | |
4594 | set_default_fcs(chan); | |
4595 | ||
4596 | err = l2cap_ertm_init(chan); | |
4597 | if (err < 0) | |
5e4e3972 | 4598 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4599 | else |
4600 | l2cap_chan_ready(chan); | |
4601 | } | |
4602 | } | |
4603 | ||
4604 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4605 | struct hci_chan *hchan) | |
4606 | { | |
4607 | chan->hs_hcon = hchan->conn; | |
4608 | chan->hs_hcon->l2cap_data = chan->conn; | |
4609 | ||
4610 | BT_DBG("move_state %d", chan->move_state); | |
4611 | ||
4612 | switch (chan->move_state) { | |
4613 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4614 | /* Move confirm will be sent after a success | |
4615 | * response is received | |
4616 | */ | |
4617 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4618 | break; | |
4619 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4620 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4621 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4622 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4623 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4624 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4625 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4626 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4627 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4628 | } | |
4629 | break; | |
4630 | default: | |
4631 | /* Move was not in expected state, free the channel */ | |
4632 | __release_logical_link(chan); | |
4633 | ||
4634 | chan->move_state = L2CAP_MOVE_STABLE; | |
4635 | } | |
4636 | } | |
4637 | ||
4638 | /* Call with chan locked */ | |
27695fb4 AE |
4639 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4640 | u8 status) | |
5b155ef9 | 4641 | { |
1500109b MM |
4642 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4643 | ||
4644 | if (status) { | |
4645 | l2cap_logical_fail(chan); | |
4646 | __release_logical_link(chan); | |
4647 | return; | |
4648 | } | |
4649 | ||
4650 | if (chan->state != BT_CONNECTED) { | |
4651 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4652 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4653 | l2cap_logical_finish_create(chan, hchan); |
4654 | } else { | |
4655 | l2cap_logical_finish_move(chan, hchan); | |
4656 | } | |
5b155ef9 MM |
4657 | } |
4658 | ||
3f7a56c4 MM |
4659 | void l2cap_move_start(struct l2cap_chan *chan) |
4660 | { | |
4661 | BT_DBG("chan %p", chan); | |
4662 | ||
6ed971ca | 4663 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4664 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4665 | return; | |
4666 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4667 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4668 | /* Placeholder - start physical link setup */ | |
4669 | } else { | |
4670 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4671 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4672 | chan->move_id = 0; | |
4673 | l2cap_move_setup(chan); | |
4674 | l2cap_send_move_chan_req(chan, 0); | |
4675 | } | |
4676 | } | |
4677 | ||
8eb200bd MM |
4678 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4679 | u8 local_amp_id, u8 remote_amp_id) | |
4680 | { | |
62748ca1 AE |
4681 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4682 | local_amp_id, remote_amp_id); | |
4683 | ||
12d6cc60 AE |
4684 | chan->fcs = L2CAP_FCS_NONE; |
4685 | ||
62748ca1 AE |
4686 | /* Outgoing channel on AMP */ |
4687 | if (chan->state == BT_CONNECT) { | |
4688 | if (result == L2CAP_CR_SUCCESS) { | |
4689 | chan->local_amp_id = local_amp_id; | |
4690 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4691 | } else { | |
4692 | /* Revert to BR/EDR connect */ | |
4693 | l2cap_send_conn_req(chan); | |
4694 | } | |
4695 | ||
4696 | return; | |
4697 | } | |
4698 | ||
4699 | /* Incoming channel on AMP */ | |
4700 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4701 | struct l2cap_conn_rsp rsp; |
4702 | char buf[128]; | |
4703 | rsp.scid = cpu_to_le16(chan->dcid); | |
4704 | rsp.dcid = cpu_to_le16(chan->scid); | |
4705 | ||
8eb200bd MM |
4706 | if (result == L2CAP_CR_SUCCESS) { |
4707 | /* Send successful response */ | |
62cd50e2 AE |
4708 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
4709 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4710 | } else { |
4711 | /* Send negative response */ | |
62cd50e2 AE |
4712 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4713 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4714 | } |
4715 | ||
4716 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4717 | sizeof(rsp), &rsp); | |
4718 | ||
4719 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4720 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4721 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4722 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4723 | L2CAP_CONF_REQ, | |
4724 | l2cap_build_conf_req(chan, buf), buf); | |
4725 | chan->num_conf_req++; | |
4726 | } | |
8eb200bd MM |
4727 | } |
4728 | } | |
4729 | ||
4730 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4731 | u8 remote_amp_id) | |
4732 | { | |
4733 | l2cap_move_setup(chan); | |
4734 | chan->move_id = local_amp_id; | |
4735 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4736 | ||
4737 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4738 | } | |
4739 | ||
4740 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4741 | { | |
4742 | struct hci_chan *hchan = NULL; | |
4743 | ||
4744 | /* Placeholder - get hci_chan for logical link */ | |
4745 | ||
4746 | if (hchan) { | |
4747 | if (hchan->state == BT_CONNECTED) { | |
4748 | /* Logical link is ready to go */ | |
4749 | chan->hs_hcon = hchan->conn; | |
4750 | chan->hs_hcon->l2cap_data = chan->conn; | |
4751 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4752 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4753 | ||
4754 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4755 | } else { | |
4756 | /* Wait for logical link to be ready */ | |
4757 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4758 | } | |
4759 | } else { | |
4760 | /* Logical link not available */ | |
4761 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4762 | } | |
4763 | } | |
4764 | ||
4765 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4766 | { | |
4767 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4768 | u8 rsp_result; | |
4769 | if (result == -EINVAL) | |
4770 | rsp_result = L2CAP_MR_BAD_ID; | |
4771 | else | |
4772 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4773 | ||
4774 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4775 | } | |
4776 | ||
4777 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4778 | chan->move_state = L2CAP_MOVE_STABLE; | |
4779 | ||
4780 | /* Restart data transmission */ | |
4781 | l2cap_ertm_send(chan); | |
4782 | } | |
4783 | ||
a514b17f AE |
4784 | /* Invoke with locked chan */ |
4785 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4786 | { |
770bfefa | 4787 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4788 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4789 | |
8eb200bd MM |
4790 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4791 | chan, result, local_amp_id, remote_amp_id); | |
4792 | ||
8eb200bd MM |
4793 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4794 | l2cap_chan_unlock(chan); | |
4795 | return; | |
4796 | } | |
4797 | ||
4798 | if (chan->state != BT_CONNECTED) { | |
4799 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4800 | } else if (result != L2CAP_MR_SUCCESS) { | |
4801 | l2cap_do_move_cancel(chan, result); | |
4802 | } else { | |
4803 | switch (chan->move_role) { | |
4804 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4805 | l2cap_do_move_initiate(chan, local_amp_id, | |
4806 | remote_amp_id); | |
4807 | break; | |
4808 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4809 | l2cap_do_move_respond(chan, result); | |
4810 | break; | |
4811 | default: | |
4812 | l2cap_do_move_cancel(chan, result); | |
4813 | break; | |
4814 | } | |
4815 | } | |
8eb200bd MM |
4816 | } |
4817 | ||
8d5a04a1 | 4818 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4819 | struct l2cap_cmd_hdr *cmd, |
4820 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4821 | { |
4822 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4823 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4824 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4825 | u16 icid = 0; |
4826 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4827 | ||
4828 | if (cmd_len != sizeof(*req)) | |
4829 | return -EPROTO; | |
4830 | ||
4831 | icid = le16_to_cpu(req->icid); | |
4832 | ||
ad0ac6ca | 4833 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4834 | |
848566b3 | 4835 | if (!conn->hs_enabled) |
8d5a04a1 MM |
4836 | return -EINVAL; |
4837 | ||
02b0fbb9 MM |
4838 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4839 | if (!chan) { | |
1500109b MM |
4840 | rsp.icid = cpu_to_le16(icid); |
4841 | rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); | |
4842 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, | |
4843 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4844 | return 0; |
4845 | } | |
4846 | ||
1500109b MM |
4847 | chan->ident = cmd->ident; |
4848 | ||
02b0fbb9 MM |
4849 | if (chan->scid < L2CAP_CID_DYN_START || |
4850 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4851 | (chan->mode != L2CAP_MODE_ERTM && | |
4852 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4853 | result = L2CAP_MR_NOT_ALLOWED; | |
4854 | goto send_move_response; | |
4855 | } | |
4856 | ||
4857 | if (chan->local_amp_id == req->dest_amp_id) { | |
4858 | result = L2CAP_MR_SAME_ID; | |
4859 | goto send_move_response; | |
4860 | } | |
4861 | ||
6ed971ca | 4862 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4863 | struct hci_dev *hdev; |
4864 | hdev = hci_dev_get(req->dest_amp_id); | |
4865 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4866 | !test_bit(HCI_UP, &hdev->flags)) { | |
4867 | if (hdev) | |
4868 | hci_dev_put(hdev); | |
4869 | ||
4870 | result = L2CAP_MR_BAD_ID; | |
4871 | goto send_move_response; | |
4872 | } | |
4873 | hci_dev_put(hdev); | |
4874 | } | |
4875 | ||
4876 | /* Detect a move collision. Only send a collision response | |
4877 | * if this side has "lost", otherwise proceed with the move. | |
4878 | * The winner has the larger bd_addr. | |
4879 | */ | |
4880 | if ((__chan_is_moving(chan) || | |
4881 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4882 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4883 | result = L2CAP_MR_COLLISION; |
4884 | goto send_move_response; | |
4885 | } | |
4886 | ||
02b0fbb9 MM |
4887 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4888 | l2cap_move_setup(chan); | |
4889 | chan->move_id = req->dest_amp_id; | |
4890 | icid = chan->dcid; | |
4891 | ||
6ed971ca | 4892 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4893 | /* Moving to BR/EDR */ |
4894 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4895 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4896 | result = L2CAP_MR_PEND; | |
4897 | } else { | |
4898 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4899 | result = L2CAP_MR_SUCCESS; | |
4900 | } | |
4901 | } else { | |
4902 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4903 | /* Placeholder - uncomment when amp functions are available */ | |
4904 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4905 | result = L2CAP_MR_PEND; | |
4906 | } | |
4907 | ||
4908 | send_move_response: | |
1500109b | 4909 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4910 | |
02b0fbb9 MM |
4911 | l2cap_chan_unlock(chan); |
4912 | ||
8d5a04a1 MM |
4913 | return 0; |
4914 | } | |
4915 | ||
5b155ef9 MM |
4916 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4917 | { | |
4918 | struct l2cap_chan *chan; | |
4919 | struct hci_chan *hchan = NULL; | |
4920 | ||
4921 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4922 | if (!chan) { | |
4923 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4924 | return; | |
4925 | } | |
4926 | ||
4927 | __clear_chan_timer(chan); | |
4928 | if (result == L2CAP_MR_PEND) | |
4929 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4930 | ||
4931 | switch (chan->move_state) { | |
4932 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4933 | /* Move confirm will be sent when logical link | |
4934 | * is complete. | |
4935 | */ | |
4936 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4937 | break; | |
4938 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4939 | if (result == L2CAP_MR_PEND) { | |
4940 | break; | |
4941 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4942 | &chan->conn_state)) { | |
4943 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4944 | } else { | |
4945 | /* Logical link is up or moving to BR/EDR, | |
4946 | * proceed with move | |
4947 | */ | |
4948 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4949 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4950 | } | |
4951 | break; | |
4952 | case L2CAP_MOVE_WAIT_RSP: | |
4953 | /* Moving to AMP */ | |
4954 | if (result == L2CAP_MR_SUCCESS) { | |
4955 | /* Remote is ready, send confirm immediately | |
4956 | * after logical link is ready | |
4957 | */ | |
4958 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4959 | } else { | |
4960 | /* Both logical link and move success | |
4961 | * are required to confirm | |
4962 | */ | |
4963 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
4964 | } | |
4965 | ||
4966 | /* Placeholder - get hci_chan for logical link */ | |
4967 | if (!hchan) { | |
4968 | /* Logical link not available */ | |
4969 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4970 | break; | |
4971 | } | |
4972 | ||
4973 | /* If the logical link is not yet connected, do not | |
4974 | * send confirmation. | |
4975 | */ | |
4976 | if (hchan->state != BT_CONNECTED) | |
4977 | break; | |
4978 | ||
4979 | /* Logical link is already ready to go */ | |
4980 | ||
4981 | chan->hs_hcon = hchan->conn; | |
4982 | chan->hs_hcon->l2cap_data = chan->conn; | |
4983 | ||
4984 | if (result == L2CAP_MR_SUCCESS) { | |
4985 | /* Can confirm now */ | |
4986 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4987 | } else { | |
4988 | /* Now only need move success | |
4989 | * to confirm | |
4990 | */ | |
4991 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4992 | } | |
4993 | ||
4994 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4995 | break; | |
4996 | default: | |
4997 | /* Any other amp move state means the move failed. */ | |
4998 | chan->move_id = chan->local_amp_id; | |
4999 | l2cap_move_done(chan); | |
5000 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5001 | } | |
5002 | ||
5003 | l2cap_chan_unlock(chan); | |
5004 | } | |
5005 | ||
5006 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5007 | u16 result) | |
5008 | { | |
5009 | struct l2cap_chan *chan; | |
5010 | ||
5011 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5012 | if (!chan) { | |
5013 | /* Could not locate channel, icid is best guess */ | |
5014 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5015 | return; | |
5016 | } | |
5017 | ||
5018 | __clear_chan_timer(chan); | |
5019 | ||
5020 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5021 | if (result == L2CAP_MR_COLLISION) { | |
5022 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5023 | } else { | |
5024 | /* Cleanup - cancel move */ | |
5025 | chan->move_id = chan->local_amp_id; | |
5026 | l2cap_move_done(chan); | |
5027 | } | |
5028 | } | |
5029 | ||
5030 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5031 | ||
5032 | l2cap_chan_unlock(chan); | |
5033 | } | |
5034 | ||
5035 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5036 | struct l2cap_cmd_hdr *cmd, | |
5037 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5038 | { |
5039 | struct l2cap_move_chan_rsp *rsp = data; | |
5040 | u16 icid, result; | |
5041 | ||
5042 | if (cmd_len != sizeof(*rsp)) | |
5043 | return -EPROTO; | |
5044 | ||
5045 | icid = le16_to_cpu(rsp->icid); | |
5046 | result = le16_to_cpu(rsp->result); | |
5047 | ||
ad0ac6ca | 5048 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5049 | |
5b155ef9 MM |
5050 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5051 | l2cap_move_continue(conn, icid, result); | |
5052 | else | |
5053 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5054 | |
5055 | return 0; | |
5056 | } | |
5057 | ||
5f3847a4 MM |
5058 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5059 | struct l2cap_cmd_hdr *cmd, | |
5060 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5061 | { |
5062 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5063 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5064 | u16 icid, result; |
5065 | ||
5066 | if (cmd_len != sizeof(*cfm)) | |
5067 | return -EPROTO; | |
5068 | ||
5069 | icid = le16_to_cpu(cfm->icid); | |
5070 | result = le16_to_cpu(cfm->result); | |
5071 | ||
ad0ac6ca | 5072 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5073 | |
5f3847a4 MM |
5074 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5075 | if (!chan) { | |
5076 | /* Spec requires a response even if the icid was not found */ | |
5077 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5078 | return 0; | |
5079 | } | |
5080 | ||
5081 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5082 | if (result == L2CAP_MC_CONFIRMED) { | |
5083 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5084 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5085 | __release_logical_link(chan); |
5086 | } else { | |
5087 | chan->move_id = chan->local_amp_id; | |
5088 | } | |
5089 | ||
5090 | l2cap_move_done(chan); | |
5091 | } | |
5092 | ||
8d5a04a1 MM |
5093 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5094 | ||
5f3847a4 MM |
5095 | l2cap_chan_unlock(chan); |
5096 | ||
8d5a04a1 MM |
5097 | return 0; |
5098 | } | |
5099 | ||
5100 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5101 | struct l2cap_cmd_hdr *cmd, |
5102 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5103 | { |
5104 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5105 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5106 | u16 icid; |
5107 | ||
5108 | if (cmd_len != sizeof(*rsp)) | |
5109 | return -EPROTO; | |
5110 | ||
5111 | icid = le16_to_cpu(rsp->icid); | |
5112 | ||
ad0ac6ca | 5113 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5114 | |
3fd71a0a MM |
5115 | chan = l2cap_get_chan_by_scid(conn, icid); |
5116 | if (!chan) | |
5117 | return 0; | |
5118 | ||
5119 | __clear_chan_timer(chan); | |
5120 | ||
5121 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5122 | chan->local_amp_id = chan->move_id; | |
5123 | ||
6ed971ca | 5124 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5125 | __release_logical_link(chan); |
5126 | ||
5127 | l2cap_move_done(chan); | |
5128 | } | |
5129 | ||
5130 | l2cap_chan_unlock(chan); | |
5131 | ||
8d5a04a1 MM |
5132 | return 0; |
5133 | } | |
5134 | ||
e2174ca4 | 5135 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 5136 | u16 to_multiplier) |
de73115a CT |
5137 | { |
5138 | u16 max_latency; | |
5139 | ||
5140 | if (min > max || min < 6 || max > 3200) | |
5141 | return -EINVAL; | |
5142 | ||
5143 | if (to_multiplier < 10 || to_multiplier > 3200) | |
5144 | return -EINVAL; | |
5145 | ||
5146 | if (max >= to_multiplier * 8) | |
5147 | return -EINVAL; | |
5148 | ||
5149 | max_latency = (to_multiplier * 8 / max) - 1; | |
5150 | if (latency > 499 || latency > max_latency) | |
5151 | return -EINVAL; | |
5152 | ||
5153 | return 0; | |
5154 | } | |
5155 | ||
5156 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 GP |
5157 | struct l2cap_cmd_hdr *cmd, |
5158 | u8 *data) | |
de73115a CT |
5159 | { |
5160 | struct hci_conn *hcon = conn->hcon; | |
5161 | struct l2cap_conn_param_update_req *req; | |
5162 | struct l2cap_conn_param_update_rsp rsp; | |
5163 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 5164 | int err; |
de73115a CT |
5165 | |
5166 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
5167 | return -EINVAL; | |
5168 | ||
5169 | cmd_len = __le16_to_cpu(cmd->len); | |
5170 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
5171 | return -EPROTO; | |
5172 | ||
5173 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5174 | min = __le16_to_cpu(req->min); |
5175 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5176 | latency = __le16_to_cpu(req->latency); |
5177 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5178 | ||
5179 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5180 | min, max, latency, to_multiplier); |
de73115a CT |
5181 | |
5182 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
5183 | |
5184 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
5185 | if (err) | |
ac73498c | 5186 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5187 | else |
ac73498c | 5188 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5189 | |
5190 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5191 | sizeof(rsp), &rsp); |
de73115a | 5192 | |
2ce603eb CT |
5193 | if (!err) |
5194 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
5195 | ||
de73115a CT |
5196 | return 0; |
5197 | } | |
5198 | ||
3300d9a9 | 5199 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5200 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5201 | u8 *data) | |
3300d9a9 CT |
5202 | { |
5203 | int err = 0; | |
5204 | ||
5205 | switch (cmd->code) { | |
5206 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5207 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5208 | break; |
5209 | ||
5210 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5211 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5212 | break; |
5213 | ||
5214 | case L2CAP_CONN_RSP: | |
f5a2598d | 5215 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5216 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5217 | break; |
5218 | ||
5219 | case L2CAP_CONF_REQ: | |
5220 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5221 | break; | |
5222 | ||
5223 | case L2CAP_CONF_RSP: | |
9245e737 | 5224 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5225 | break; |
5226 | ||
5227 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5228 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5229 | break; |
5230 | ||
5231 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5232 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5233 | break; |
5234 | ||
5235 | case L2CAP_ECHO_REQ: | |
5236 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5237 | break; | |
5238 | ||
5239 | case L2CAP_ECHO_RSP: | |
5240 | break; | |
5241 | ||
5242 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5243 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5244 | break; |
5245 | ||
5246 | case L2CAP_INFO_RSP: | |
9245e737 | 5247 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5248 | break; |
5249 | ||
f94ff6ff MM |
5250 | case L2CAP_CREATE_CHAN_REQ: |
5251 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5252 | break; | |
5253 | ||
8d5a04a1 MM |
5254 | case L2CAP_MOVE_CHAN_REQ: |
5255 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5256 | break; | |
5257 | ||
5258 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5259 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5260 | break; |
5261 | ||
5262 | case L2CAP_MOVE_CHAN_CFM: | |
5263 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5264 | break; | |
5265 | ||
5266 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5267 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5268 | break; |
5269 | ||
3300d9a9 CT |
5270 | default: |
5271 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5272 | err = -EINVAL; | |
5273 | break; | |
5274 | } | |
5275 | ||
5276 | return err; | |
5277 | } | |
5278 | ||
5279 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2d792818 | 5280 | struct l2cap_cmd_hdr *cmd, u8 *data) |
3300d9a9 CT |
5281 | { |
5282 | switch (cmd->code) { | |
5283 | case L2CAP_COMMAND_REJ: | |
5284 | return 0; | |
5285 | ||
5286 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 5287 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
5288 | |
5289 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
5290 | return 0; | |
5291 | ||
5292 | default: | |
5293 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
5294 | return -EINVAL; | |
5295 | } | |
5296 | } | |
5297 | ||
c5623556 JH |
5298 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5299 | struct sk_buff *skb) | |
5300 | { | |
69c4e4e8 | 5301 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5302 | struct l2cap_cmd_hdr *cmd; |
5303 | u16 len; | |
c5623556 JH |
5304 | int err; |
5305 | ||
69c4e4e8 | 5306 | if (hcon->type != LE_LINK) |
3b166295 | 5307 | goto drop; |
69c4e4e8 | 5308 | |
4f3e219d MH |
5309 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5310 | goto drop; | |
c5623556 | 5311 | |
4f3e219d MH |
5312 | cmd = (void *) skb->data; |
5313 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5314 | |
4f3e219d | 5315 | len = le16_to_cpu(cmd->len); |
c5623556 | 5316 | |
4f3e219d | 5317 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5318 | |
4f3e219d MH |
5319 | if (len != skb->len || !cmd->ident) { |
5320 | BT_DBG("corrupted command"); | |
5321 | goto drop; | |
5322 | } | |
c5623556 | 5323 | |
4f3e219d MH |
5324 | err = l2cap_le_sig_cmd(conn, cmd, skb->data); |
5325 | if (err) { | |
5326 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5327 | |
4f3e219d | 5328 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5329 | |
a521149a | 5330 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5331 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5332 | sizeof(rej), &rej); | |
c5623556 JH |
5333 | } |
5334 | ||
3b166295 | 5335 | drop: |
c5623556 JH |
5336 | kfree_skb(skb); |
5337 | } | |
5338 | ||
3300d9a9 | 5339 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5340 | struct sk_buff *skb) |
1da177e4 | 5341 | { |
69c4e4e8 | 5342 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5343 | u8 *data = skb->data; |
5344 | int len = skb->len; | |
5345 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5346 | int err; |
1da177e4 LT |
5347 | |
5348 | l2cap_raw_recv(conn, skb); | |
5349 | ||
69c4e4e8 | 5350 | if (hcon->type != ACL_LINK) |
3b166295 | 5351 | goto drop; |
69c4e4e8 | 5352 | |
1da177e4 | 5353 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5354 | u16 cmd_len; |
1da177e4 LT |
5355 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5356 | data += L2CAP_CMD_HDR_SIZE; | |
5357 | len -= L2CAP_CMD_HDR_SIZE; | |
5358 | ||
88219a0f | 5359 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5360 | |
2d792818 GP |
5361 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5362 | cmd.ident); | |
1da177e4 | 5363 | |
88219a0f | 5364 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5365 | BT_DBG("corrupted command"); |
5366 | break; | |
5367 | } | |
5368 | ||
c5623556 | 5369 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5370 | if (err) { |
e2fd318e | 5371 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5372 | |
5373 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5374 | |
a521149a | 5375 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5376 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5377 | sizeof(rej), &rej); | |
1da177e4 LT |
5378 | } |
5379 | ||
88219a0f AV |
5380 | data += cmd_len; |
5381 | len -= cmd_len; | |
1da177e4 LT |
5382 | } |
5383 | ||
3b166295 | 5384 | drop: |
1da177e4 LT |
5385 | kfree_skb(skb); |
5386 | } | |
5387 | ||
47d1ec61 | 5388 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5389 | { |
5390 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5391 | int hdr_size; |
5392 | ||
5393 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5394 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5395 | else | |
5396 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5397 | |
47d1ec61 | 5398 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5399 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5400 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5401 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5402 | ||
5403 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5404 | return -EBADMSG; |
fcc203c3 GP |
5405 | } |
5406 | return 0; | |
5407 | } | |
5408 | ||
6ea00485 | 5409 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5410 | { |
e31f7633 | 5411 | struct l2cap_ctrl control; |
d5392c8f | 5412 | |
e31f7633 | 5413 | BT_DBG("chan %p", chan); |
d5392c8f | 5414 | |
e31f7633 MM |
5415 | memset(&control, 0, sizeof(control)); |
5416 | control.sframe = 1; | |
5417 | control.final = 1; | |
5418 | control.reqseq = chan->buffer_seq; | |
5419 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5420 | |
e2ab4353 | 5421 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5422 | control.super = L2CAP_SUPER_RNR; |
5423 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5424 | } |
5425 | ||
e31f7633 MM |
5426 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5427 | chan->unacked_frames > 0) | |
5428 | __set_retrans_timer(chan); | |
d5392c8f | 5429 | |
e31f7633 | 5430 | /* Send pending iframes */ |
525cd185 | 5431 | l2cap_ertm_send(chan); |
d5392c8f | 5432 | |
e2ab4353 | 5433 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5434 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5435 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5436 | * send it now. | |
5437 | */ | |
5438 | control.super = L2CAP_SUPER_RR; | |
5439 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5440 | } |
5441 | } | |
5442 | ||
2d792818 GP |
5443 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5444 | struct sk_buff **last_frag) | |
18778a63 | 5445 | { |
84084a31 MM |
5446 | /* skb->len reflects data in skb as well as all fragments |
5447 | * skb->data_len reflects only data in fragments | |
5448 | */ | |
5449 | if (!skb_has_frag_list(skb)) | |
5450 | skb_shinfo(skb)->frag_list = new_frag; | |
5451 | ||
5452 | new_frag->next = NULL; | |
5453 | ||
5454 | (*last_frag)->next = new_frag; | |
5455 | *last_frag = new_frag; | |
5456 | ||
5457 | skb->len += new_frag->len; | |
5458 | skb->data_len += new_frag->len; | |
5459 | skb->truesize += new_frag->truesize; | |
5460 | } | |
5461 | ||
4b51dae9 MM |
5462 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5463 | struct l2cap_ctrl *control) | |
84084a31 MM |
5464 | { |
5465 | int err = -EINVAL; | |
18778a63 | 5466 | |
4b51dae9 | 5467 | switch (control->sar) { |
7e0ef6ee | 5468 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5469 | if (chan->sdu) |
5470 | break; | |
18778a63 | 5471 | |
80b98027 | 5472 | err = chan->ops->recv(chan, skb); |
84084a31 | 5473 | break; |
18778a63 | 5474 | |
7e0ef6ee | 5475 | case L2CAP_SAR_START: |
84084a31 MM |
5476 | if (chan->sdu) |
5477 | break; | |
18778a63 | 5478 | |
6f61fd47 | 5479 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5480 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5481 | |
84084a31 MM |
5482 | if (chan->sdu_len > chan->imtu) { |
5483 | err = -EMSGSIZE; | |
5484 | break; | |
5485 | } | |
1890d36b | 5486 | |
84084a31 MM |
5487 | if (skb->len >= chan->sdu_len) |
5488 | break; | |
18778a63 | 5489 | |
84084a31 MM |
5490 | chan->sdu = skb; |
5491 | chan->sdu_last_frag = skb; | |
18778a63 | 5492 | |
84084a31 MM |
5493 | skb = NULL; |
5494 | err = 0; | |
18778a63 GP |
5495 | break; |
5496 | ||
7e0ef6ee | 5497 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5498 | if (!chan->sdu) |
84084a31 | 5499 | break; |
18778a63 | 5500 | |
84084a31 MM |
5501 | append_skb_frag(chan->sdu, skb, |
5502 | &chan->sdu_last_frag); | |
5503 | skb = NULL; | |
18778a63 | 5504 | |
84084a31 MM |
5505 | if (chan->sdu->len >= chan->sdu_len) |
5506 | break; | |
4178ba46 | 5507 | |
84084a31 | 5508 | err = 0; |
18778a63 GP |
5509 | break; |
5510 | ||
7e0ef6ee | 5511 | case L2CAP_SAR_END: |
6f61fd47 | 5512 | if (!chan->sdu) |
84084a31 | 5513 | break; |
18778a63 | 5514 | |
84084a31 MM |
5515 | append_skb_frag(chan->sdu, skb, |
5516 | &chan->sdu_last_frag); | |
5517 | skb = NULL; | |
4178ba46 | 5518 | |
84084a31 MM |
5519 | if (chan->sdu->len != chan->sdu_len) |
5520 | break; | |
18778a63 | 5521 | |
80b98027 | 5522 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5523 | |
84084a31 MM |
5524 | if (!err) { |
5525 | /* Reassembly complete */ | |
5526 | chan->sdu = NULL; | |
5527 | chan->sdu_last_frag = NULL; | |
5528 | chan->sdu_len = 0; | |
1890d36b | 5529 | } |
18778a63 GP |
5530 | break; |
5531 | } | |
5532 | ||
84084a31 MM |
5533 | if (err) { |
5534 | kfree_skb(skb); | |
5535 | kfree_skb(chan->sdu); | |
5536 | chan->sdu = NULL; | |
5537 | chan->sdu_last_frag = NULL; | |
5538 | chan->sdu_len = 0; | |
5539 | } | |
18778a63 | 5540 | |
84084a31 | 5541 | return err; |
18778a63 GP |
5542 | } |
5543 | ||
32b32735 MM |
5544 | static int l2cap_resegment(struct l2cap_chan *chan) |
5545 | { | |
5546 | /* Placeholder */ | |
5547 | return 0; | |
5548 | } | |
5549 | ||
61aa4f5b | 5550 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5551 | { |
61aa4f5b | 5552 | u8 event; |
712132eb | 5553 | |
61aa4f5b MM |
5554 | if (chan->mode != L2CAP_MODE_ERTM) |
5555 | return; | |
712132eb | 5556 | |
61aa4f5b | 5557 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5558 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5559 | } |
5560 | ||
d2a7ac5d MM |
5561 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5562 | { | |
63838725 MM |
5563 | int err = 0; |
5564 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5565 | * until a gap is encountered. | |
5566 | */ | |
5567 | ||
5568 | BT_DBG("chan %p", chan); | |
5569 | ||
5570 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5571 | struct sk_buff *skb; | |
5572 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5573 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5574 | ||
5575 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5576 | ||
5577 | if (!skb) | |
5578 | break; | |
5579 | ||
5580 | skb_unlink(skb, &chan->srej_q); | |
5581 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5582 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5583 | if (err) | |
5584 | break; | |
5585 | } | |
5586 | ||
5587 | if (skb_queue_empty(&chan->srej_q)) { | |
5588 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5589 | l2cap_send_ack(chan); | |
5590 | } | |
5591 | ||
5592 | return err; | |
d2a7ac5d MM |
5593 | } |
5594 | ||
5595 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5596 | struct l2cap_ctrl *control) | |
5597 | { | |
f80842a8 MM |
5598 | struct sk_buff *skb; |
5599 | ||
5600 | BT_DBG("chan %p, control %p", chan, control); | |
5601 | ||
5602 | if (control->reqseq == chan->next_tx_seq) { | |
5603 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5604 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5605 | return; |
5606 | } | |
5607 | ||
5608 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5609 | ||
5610 | if (skb == NULL) { | |
5611 | BT_DBG("Seq %d not available for retransmission", | |
5612 | control->reqseq); | |
5613 | return; | |
5614 | } | |
5615 | ||
5616 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5617 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5618 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5619 | return; |
5620 | } | |
5621 | ||
5622 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5623 | ||
5624 | if (control->poll) { | |
5625 | l2cap_pass_to_tx(chan, control); | |
5626 | ||
5627 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5628 | l2cap_retransmit(chan, control); | |
5629 | l2cap_ertm_send(chan); | |
5630 | ||
5631 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5632 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5633 | chan->srej_save_reqseq = control->reqseq; | |
5634 | } | |
5635 | } else { | |
5636 | l2cap_pass_to_tx_fbit(chan, control); | |
5637 | ||
5638 | if (control->final) { | |
5639 | if (chan->srej_save_reqseq != control->reqseq || | |
5640 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5641 | &chan->conn_state)) | |
5642 | l2cap_retransmit(chan, control); | |
5643 | } else { | |
5644 | l2cap_retransmit(chan, control); | |
5645 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5646 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5647 | chan->srej_save_reqseq = control->reqseq; | |
5648 | } | |
5649 | } | |
5650 | } | |
d2a7ac5d MM |
5651 | } |
5652 | ||
5653 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5654 | struct l2cap_ctrl *control) | |
5655 | { | |
fcd289df MM |
5656 | struct sk_buff *skb; |
5657 | ||
5658 | BT_DBG("chan %p, control %p", chan, control); | |
5659 | ||
5660 | if (control->reqseq == chan->next_tx_seq) { | |
5661 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5662 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5663 | return; |
5664 | } | |
5665 | ||
5666 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5667 | ||
5668 | if (chan->max_tx && skb && | |
5669 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
5670 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5671 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5672 | return; |
5673 | } | |
5674 | ||
5675 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5676 | ||
5677 | l2cap_pass_to_tx(chan, control); | |
5678 | ||
5679 | if (control->final) { | |
5680 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
5681 | l2cap_retransmit_all(chan, control); | |
5682 | } else { | |
5683 | l2cap_retransmit_all(chan, control); | |
5684 | l2cap_ertm_send(chan); | |
5685 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
5686 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
5687 | } | |
d2a7ac5d MM |
5688 | } |
5689 | ||
4b51dae9 MM |
5690 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
5691 | { | |
5692 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
5693 | ||
5694 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
5695 | chan->expected_tx_seq); | |
5696 | ||
5697 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
5698 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 5699 | chan->tx_win) { |
4b51dae9 MM |
5700 | /* See notes below regarding "double poll" and |
5701 | * invalid packets. | |
5702 | */ | |
5703 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5704 | BT_DBG("Invalid/Ignore - after SREJ"); | |
5705 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5706 | } else { | |
5707 | BT_DBG("Invalid - in window after SREJ sent"); | |
5708 | return L2CAP_TXSEQ_INVALID; | |
5709 | } | |
5710 | } | |
5711 | ||
5712 | if (chan->srej_list.head == txseq) { | |
5713 | BT_DBG("Expected SREJ"); | |
5714 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
5715 | } | |
5716 | ||
5717 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
5718 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
5719 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
5720 | } | |
5721 | ||
5722 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
5723 | BT_DBG("Unexpected SREJ - not requested"); | |
5724 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
5725 | } | |
5726 | } | |
5727 | ||
5728 | if (chan->expected_tx_seq == txseq) { | |
5729 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
5730 | chan->tx_win) { | |
5731 | BT_DBG("Invalid - txseq outside tx window"); | |
5732 | return L2CAP_TXSEQ_INVALID; | |
5733 | } else { | |
5734 | BT_DBG("Expected"); | |
5735 | return L2CAP_TXSEQ_EXPECTED; | |
5736 | } | |
5737 | } | |
5738 | ||
5739 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 5740 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
5741 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
5742 | return L2CAP_TXSEQ_DUPLICATE; | |
5743 | } | |
5744 | ||
5745 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
5746 | /* A source of invalid packets is a "double poll" condition, | |
5747 | * where delays cause us to send multiple poll packets. If | |
5748 | * the remote stack receives and processes both polls, | |
5749 | * sequence numbers can wrap around in such a way that a | |
5750 | * resent frame has a sequence number that looks like new data | |
5751 | * with a sequence gap. This would trigger an erroneous SREJ | |
5752 | * request. | |
5753 | * | |
5754 | * Fortunately, this is impossible with a tx window that's | |
5755 | * less than half of the maximum sequence number, which allows | |
5756 | * invalid frames to be safely ignored. | |
5757 | * | |
5758 | * With tx window sizes greater than half of the tx window | |
5759 | * maximum, the frame is invalid and cannot be ignored. This | |
5760 | * causes a disconnect. | |
5761 | */ | |
5762 | ||
5763 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5764 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
5765 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5766 | } else { | |
5767 | BT_DBG("Invalid - txseq outside tx window"); | |
5768 | return L2CAP_TXSEQ_INVALID; | |
5769 | } | |
5770 | } else { | |
5771 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
5772 | return L2CAP_TXSEQ_UNEXPECTED; | |
5773 | } | |
5774 | } | |
5775 | ||
d2a7ac5d MM |
5776 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
5777 | struct l2cap_ctrl *control, | |
5778 | struct sk_buff *skb, u8 event) | |
5779 | { | |
5780 | int err = 0; | |
941247f9 | 5781 | bool skb_in_use = false; |
d2a7ac5d MM |
5782 | |
5783 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5784 | event); | |
5785 | ||
5786 | switch (event) { | |
5787 | case L2CAP_EV_RECV_IFRAME: | |
5788 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
5789 | case L2CAP_TXSEQ_EXPECTED: | |
5790 | l2cap_pass_to_tx(chan, control); | |
5791 | ||
5792 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5793 | BT_DBG("Busy, discarding expected seq %d", | |
5794 | control->txseq); | |
5795 | break; | |
5796 | } | |
5797 | ||
5798 | chan->expected_tx_seq = __next_seq(chan, | |
5799 | control->txseq); | |
5800 | ||
5801 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 5802 | skb_in_use = true; |
d2a7ac5d MM |
5803 | |
5804 | err = l2cap_reassemble_sdu(chan, skb, control); | |
5805 | if (err) | |
5806 | break; | |
5807 | ||
5808 | if (control->final) { | |
5809 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5810 | &chan->conn_state)) { | |
5811 | control->final = 0; | |
5812 | l2cap_retransmit_all(chan, control); | |
5813 | l2cap_ertm_send(chan); | |
5814 | } | |
5815 | } | |
5816 | ||
5817 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
5818 | l2cap_send_ack(chan); | |
5819 | break; | |
5820 | case L2CAP_TXSEQ_UNEXPECTED: | |
5821 | l2cap_pass_to_tx(chan, control); | |
5822 | ||
5823 | /* Can't issue SREJ frames in the local busy state. | |
5824 | * Drop this frame, it will be seen as missing | |
5825 | * when local busy is exited. | |
5826 | */ | |
5827 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5828 | BT_DBG("Busy, discarding unexpected seq %d", | |
5829 | control->txseq); | |
5830 | break; | |
5831 | } | |
5832 | ||
5833 | /* There was a gap in the sequence, so an SREJ | |
5834 | * must be sent for each missing frame. The | |
5835 | * current frame is stored for later use. | |
5836 | */ | |
5837 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 5838 | skb_in_use = true; |
d2a7ac5d MM |
5839 | BT_DBG("Queued %p (queue len %d)", skb, |
5840 | skb_queue_len(&chan->srej_q)); | |
5841 | ||
5842 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5843 | l2cap_seq_list_clear(&chan->srej_list); | |
5844 | l2cap_send_srej(chan, control->txseq); | |
5845 | ||
5846 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
5847 | break; | |
5848 | case L2CAP_TXSEQ_DUPLICATE: | |
5849 | l2cap_pass_to_tx(chan, control); | |
5850 | break; | |
5851 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5852 | break; | |
5853 | case L2CAP_TXSEQ_INVALID: | |
5854 | default: | |
5e4e3972 | 5855 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
5856 | break; |
5857 | } | |
5858 | break; | |
5859 | case L2CAP_EV_RECV_RR: | |
5860 | l2cap_pass_to_tx(chan, control); | |
5861 | if (control->final) { | |
5862 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5863 | ||
e6a3ee6e MM |
5864 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
5865 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
5866 | control->final = 0; |
5867 | l2cap_retransmit_all(chan, control); | |
5868 | } | |
5869 | ||
5870 | l2cap_ertm_send(chan); | |
5871 | } else if (control->poll) { | |
5872 | l2cap_send_i_or_rr_or_rnr(chan); | |
5873 | } else { | |
5874 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
5875 | &chan->conn_state) && | |
5876 | chan->unacked_frames) | |
5877 | __set_retrans_timer(chan); | |
5878 | ||
5879 | l2cap_ertm_send(chan); | |
5880 | } | |
5881 | break; | |
5882 | case L2CAP_EV_RECV_RNR: | |
5883 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5884 | l2cap_pass_to_tx(chan, control); | |
5885 | if (control && control->poll) { | |
5886 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5887 | l2cap_send_rr_or_rnr(chan, 0); | |
5888 | } | |
5889 | __clear_retrans_timer(chan); | |
5890 | l2cap_seq_list_clear(&chan->retrans_list); | |
5891 | break; | |
5892 | case L2CAP_EV_RECV_REJ: | |
5893 | l2cap_handle_rej(chan, control); | |
5894 | break; | |
5895 | case L2CAP_EV_RECV_SREJ: | |
5896 | l2cap_handle_srej(chan, control); | |
5897 | break; | |
5898 | default: | |
5899 | break; | |
5900 | } | |
5901 | ||
5902 | if (skb && !skb_in_use) { | |
5903 | BT_DBG("Freeing %p", skb); | |
5904 | kfree_skb(skb); | |
5905 | } | |
5906 | ||
5907 | return err; | |
5908 | } | |
5909 | ||
5910 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
5911 | struct l2cap_ctrl *control, | |
5912 | struct sk_buff *skb, u8 event) | |
5913 | { | |
5914 | int err = 0; | |
5915 | u16 txseq = control->txseq; | |
941247f9 | 5916 | bool skb_in_use = false; |
d2a7ac5d MM |
5917 | |
5918 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
5919 | event); | |
5920 | ||
5921 | switch (event) { | |
5922 | case L2CAP_EV_RECV_IFRAME: | |
5923 | switch (l2cap_classify_txseq(chan, txseq)) { | |
5924 | case L2CAP_TXSEQ_EXPECTED: | |
5925 | /* Keep frame for reassembly later */ | |
5926 | l2cap_pass_to_tx(chan, control); | |
5927 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 5928 | skb_in_use = true; |
d2a7ac5d MM |
5929 | BT_DBG("Queued %p (queue len %d)", skb, |
5930 | skb_queue_len(&chan->srej_q)); | |
5931 | ||
5932 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
5933 | break; | |
5934 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
5935 | l2cap_seq_list_pop(&chan->srej_list); | |
5936 | ||
5937 | l2cap_pass_to_tx(chan, control); | |
5938 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 5939 | skb_in_use = true; |
d2a7ac5d MM |
5940 | BT_DBG("Queued %p (queue len %d)", skb, |
5941 | skb_queue_len(&chan->srej_q)); | |
5942 | ||
5943 | err = l2cap_rx_queued_iframes(chan); | |
5944 | if (err) | |
5945 | break; | |
5946 | ||
5947 | break; | |
5948 | case L2CAP_TXSEQ_UNEXPECTED: | |
5949 | /* Got a frame that can't be reassembled yet. | |
5950 | * Save it for later, and send SREJs to cover | |
5951 | * the missing frames. | |
5952 | */ | |
5953 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 5954 | skb_in_use = true; |
d2a7ac5d MM |
5955 | BT_DBG("Queued %p (queue len %d)", skb, |
5956 | skb_queue_len(&chan->srej_q)); | |
5957 | ||
5958 | l2cap_pass_to_tx(chan, control); | |
5959 | l2cap_send_srej(chan, control->txseq); | |
5960 | break; | |
5961 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
5962 | /* This frame was requested with an SREJ, but | |
5963 | * some expected retransmitted frames are | |
5964 | * missing. Request retransmission of missing | |
5965 | * SREJ'd frames. | |
5966 | */ | |
5967 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 5968 | skb_in_use = true; |
d2a7ac5d MM |
5969 | BT_DBG("Queued %p (queue len %d)", skb, |
5970 | skb_queue_len(&chan->srej_q)); | |
5971 | ||
5972 | l2cap_pass_to_tx(chan, control); | |
5973 | l2cap_send_srej_list(chan, control->txseq); | |
5974 | break; | |
5975 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
5976 | /* We've already queued this frame. Drop this copy. */ | |
5977 | l2cap_pass_to_tx(chan, control); | |
5978 | break; | |
5979 | case L2CAP_TXSEQ_DUPLICATE: | |
5980 | /* Expecting a later sequence number, so this frame | |
5981 | * was already received. Ignore it completely. | |
5982 | */ | |
5983 | break; | |
5984 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
5985 | break; | |
5986 | case L2CAP_TXSEQ_INVALID: | |
5987 | default: | |
5e4e3972 | 5988 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
5989 | break; |
5990 | } | |
5991 | break; | |
5992 | case L2CAP_EV_RECV_RR: | |
5993 | l2cap_pass_to_tx(chan, control); | |
5994 | if (control->final) { | |
5995 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5996 | ||
5997 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
5998 | &chan->conn_state)) { | |
5999 | control->final = 0; | |
6000 | l2cap_retransmit_all(chan, control); | |
6001 | } | |
6002 | ||
6003 | l2cap_ertm_send(chan); | |
6004 | } else if (control->poll) { | |
6005 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6006 | &chan->conn_state) && | |
6007 | chan->unacked_frames) { | |
6008 | __set_retrans_timer(chan); | |
6009 | } | |
6010 | ||
6011 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6012 | l2cap_send_srej_tail(chan); | |
6013 | } else { | |
6014 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6015 | &chan->conn_state) && | |
6016 | chan->unacked_frames) | |
6017 | __set_retrans_timer(chan); | |
6018 | ||
6019 | l2cap_send_ack(chan); | |
6020 | } | |
6021 | break; | |
6022 | case L2CAP_EV_RECV_RNR: | |
6023 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6024 | l2cap_pass_to_tx(chan, control); | |
6025 | if (control->poll) { | |
6026 | l2cap_send_srej_tail(chan); | |
6027 | } else { | |
6028 | struct l2cap_ctrl rr_control; | |
6029 | memset(&rr_control, 0, sizeof(rr_control)); | |
6030 | rr_control.sframe = 1; | |
6031 | rr_control.super = L2CAP_SUPER_RR; | |
6032 | rr_control.reqseq = chan->buffer_seq; | |
6033 | l2cap_send_sframe(chan, &rr_control); | |
6034 | } | |
6035 | ||
6036 | break; | |
6037 | case L2CAP_EV_RECV_REJ: | |
6038 | l2cap_handle_rej(chan, control); | |
6039 | break; | |
6040 | case L2CAP_EV_RECV_SREJ: | |
6041 | l2cap_handle_srej(chan, control); | |
6042 | break; | |
6043 | } | |
6044 | ||
6045 | if (skb && !skb_in_use) { | |
6046 | BT_DBG("Freeing %p", skb); | |
6047 | kfree_skb(skb); | |
6048 | } | |
6049 | ||
6050 | return err; | |
6051 | } | |
6052 | ||
32b32735 MM |
6053 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6054 | { | |
6055 | BT_DBG("chan %p", chan); | |
6056 | ||
6057 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6058 | ||
6059 | if (chan->hs_hcon) | |
6060 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6061 | else | |
6062 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6063 | ||
6064 | return l2cap_resegment(chan); | |
6065 | } | |
6066 | ||
6067 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6068 | struct l2cap_ctrl *control, | |
6069 | struct sk_buff *skb, u8 event) | |
6070 | { | |
6071 | int err; | |
6072 | ||
6073 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6074 | event); | |
6075 | ||
6076 | if (!control->poll) | |
6077 | return -EPROTO; | |
6078 | ||
6079 | l2cap_process_reqseq(chan, control->reqseq); | |
6080 | ||
6081 | if (!skb_queue_empty(&chan->tx_q)) | |
6082 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6083 | else | |
6084 | chan->tx_send_head = NULL; | |
6085 | ||
6086 | /* Rewind next_tx_seq to the point expected | |
6087 | * by the receiver. | |
6088 | */ | |
6089 | chan->next_tx_seq = control->reqseq; | |
6090 | chan->unacked_frames = 0; | |
6091 | ||
6092 | err = l2cap_finish_move(chan); | |
6093 | if (err) | |
6094 | return err; | |
6095 | ||
6096 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6097 | l2cap_send_i_or_rr_or_rnr(chan); | |
6098 | ||
6099 | if (event == L2CAP_EV_RECV_IFRAME) | |
6100 | return -EPROTO; | |
6101 | ||
6102 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6103 | } | |
6104 | ||
6105 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6106 | struct l2cap_ctrl *control, | |
6107 | struct sk_buff *skb, u8 event) | |
6108 | { | |
6109 | int err; | |
6110 | ||
6111 | if (!control->final) | |
6112 | return -EPROTO; | |
6113 | ||
6114 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6115 | ||
6116 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6117 | l2cap_process_reqseq(chan, control->reqseq); | |
6118 | ||
6119 | if (!skb_queue_empty(&chan->tx_q)) | |
6120 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6121 | else | |
6122 | chan->tx_send_head = NULL; | |
6123 | ||
6124 | /* Rewind next_tx_seq to the point expected | |
6125 | * by the receiver. | |
6126 | */ | |
6127 | chan->next_tx_seq = control->reqseq; | |
6128 | chan->unacked_frames = 0; | |
6129 | ||
6130 | if (chan->hs_hcon) | |
6131 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6132 | else | |
6133 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6134 | ||
6135 | err = l2cap_resegment(chan); | |
6136 | ||
6137 | if (!err) | |
6138 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6139 | ||
6140 | return err; | |
6141 | } | |
6142 | ||
d2a7ac5d MM |
6143 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6144 | { | |
6145 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6146 | u16 unacked; | |
6147 | ||
6148 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6149 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6150 | } | |
6151 | ||
cec8ab6e MM |
6152 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6153 | struct sk_buff *skb, u8 event) | |
218bb9df | 6154 | { |
d2a7ac5d MM |
6155 | int err = 0; |
6156 | ||
6157 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6158 | control, skb, event, chan->rx_state); | |
6159 | ||
6160 | if (__valid_reqseq(chan, control->reqseq)) { | |
6161 | switch (chan->rx_state) { | |
6162 | case L2CAP_RX_STATE_RECV: | |
6163 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6164 | break; | |
6165 | case L2CAP_RX_STATE_SREJ_SENT: | |
6166 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6167 | event); | |
6168 | break; | |
32b32735 MM |
6169 | case L2CAP_RX_STATE_WAIT_P: |
6170 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6171 | break; | |
6172 | case L2CAP_RX_STATE_WAIT_F: | |
6173 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6174 | break; | |
d2a7ac5d MM |
6175 | default: |
6176 | /* shut it down */ | |
6177 | break; | |
6178 | } | |
6179 | } else { | |
6180 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6181 | control->reqseq, chan->next_tx_seq, | |
6182 | chan->expected_ack_seq); | |
5e4e3972 | 6183 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6184 | } |
6185 | ||
6186 | return err; | |
cec8ab6e MM |
6187 | } |
6188 | ||
6189 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6190 | struct sk_buff *skb) | |
6191 | { | |
4b51dae9 MM |
6192 | int err = 0; |
6193 | ||
6194 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6195 | chan->rx_state); | |
6196 | ||
6197 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6198 | L2CAP_TXSEQ_EXPECTED) { | |
6199 | l2cap_pass_to_tx(chan, control); | |
6200 | ||
6201 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6202 | __next_seq(chan, chan->buffer_seq)); | |
6203 | ||
6204 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6205 | ||
6206 | l2cap_reassemble_sdu(chan, skb, control); | |
6207 | } else { | |
6208 | if (chan->sdu) { | |
6209 | kfree_skb(chan->sdu); | |
6210 | chan->sdu = NULL; | |
6211 | } | |
6212 | chan->sdu_last_frag = NULL; | |
6213 | chan->sdu_len = 0; | |
6214 | ||
6215 | if (skb) { | |
6216 | BT_DBG("Freeing %p", skb); | |
6217 | kfree_skb(skb); | |
6218 | } | |
6219 | } | |
6220 | ||
6221 | chan->last_acked_seq = control->txseq; | |
6222 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6223 | ||
6224 | return err; | |
cec8ab6e MM |
6225 | } |
6226 | ||
6227 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6228 | { | |
6229 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
6230 | u16 len; | |
6231 | u8 event; | |
218bb9df | 6232 | |
b76bbd66 MM |
6233 | __unpack_control(chan, skb); |
6234 | ||
218bb9df GP |
6235 | len = skb->len; |
6236 | ||
6237 | /* | |
6238 | * We can just drop the corrupted I-frame here. | |
6239 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6240 | * procedures and ask for retransmission. |
218bb9df | 6241 | */ |
47d1ec61 | 6242 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6243 | goto drop; |
6244 | ||
cec8ab6e | 6245 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6246 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6247 | |
47d1ec61 | 6248 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6249 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6250 | |
47d1ec61 | 6251 | if (len > chan->mps) { |
5e4e3972 | 6252 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6253 | goto drop; |
6254 | } | |
6255 | ||
cec8ab6e MM |
6256 | if (!control->sframe) { |
6257 | int err; | |
218bb9df | 6258 | |
cec8ab6e MM |
6259 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6260 | control->sar, control->reqseq, control->final, | |
6261 | control->txseq); | |
218bb9df | 6262 | |
cec8ab6e MM |
6263 | /* Validate F-bit - F=0 always valid, F=1 only |
6264 | * valid in TX WAIT_F | |
6265 | */ | |
6266 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6267 | goto drop; |
cec8ab6e MM |
6268 | |
6269 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6270 | event = L2CAP_EV_RECV_IFRAME; | |
6271 | err = l2cap_rx(chan, control, skb, event); | |
6272 | } else { | |
6273 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6274 | } |
6275 | ||
cec8ab6e | 6276 | if (err) |
5e4e3972 | 6277 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6278 | } else { |
cec8ab6e MM |
6279 | const u8 rx_func_to_event[4] = { |
6280 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6281 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6282 | }; | |
6283 | ||
6284 | /* Only I-frames are expected in streaming mode */ | |
6285 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6286 | goto drop; | |
6287 | ||
6288 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6289 | control->reqseq, control->final, control->poll, | |
6290 | control->super); | |
6291 | ||
218bb9df | 6292 | if (len != 0) { |
1bb166e6 | 6293 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6294 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6295 | goto drop; |
6296 | } | |
6297 | ||
cec8ab6e MM |
6298 | /* Validate F and P bits */ |
6299 | if (control->final && (control->poll || | |
6300 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6301 | goto drop; | |
6302 | ||
6303 | event = rx_func_to_event[control->super]; | |
6304 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6305 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6306 | } |
6307 | ||
6308 | return 0; | |
6309 | ||
6310 | drop: | |
6311 | kfree_skb(skb); | |
6312 | return 0; | |
6313 | } | |
6314 | ||
13ca56e0 AE |
6315 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6316 | struct sk_buff *skb) | |
1da177e4 | 6317 | { |
48454079 | 6318 | struct l2cap_chan *chan; |
1da177e4 | 6319 | |
baa7e1fa | 6320 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6321 | if (!chan) { |
97e8e89d AE |
6322 | if (cid == L2CAP_CID_A2MP) { |
6323 | chan = a2mp_channel_create(conn, skb); | |
6324 | if (!chan) { | |
6325 | kfree_skb(skb); | |
13ca56e0 | 6326 | return; |
97e8e89d AE |
6327 | } |
6328 | ||
6329 | l2cap_chan_lock(chan); | |
6330 | } else { | |
6331 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6332 | /* Drop packet and return */ | |
6333 | kfree_skb(skb); | |
13ca56e0 | 6334 | return; |
97e8e89d | 6335 | } |
1da177e4 LT |
6336 | } |
6337 | ||
49208c9c | 6338 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6339 | |
89bc500e | 6340 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6341 | goto drop; |
6342 | ||
0c1bc5c6 | 6343 | switch (chan->mode) { |
1c2acffb GP |
6344 | case L2CAP_MODE_BASIC: |
6345 | /* If socket recv buffers overflows we drop data here | |
6346 | * which is *bad* because L2CAP has to be reliable. | |
6347 | * But we don't have any other choice. L2CAP doesn't | |
6348 | * provide flow control mechanism. */ | |
1da177e4 | 6349 | |
0c1bc5c6 | 6350 | if (chan->imtu < skb->len) |
1c2acffb | 6351 | goto drop; |
1da177e4 | 6352 | |
80b98027 | 6353 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6354 | goto done; |
6355 | break; | |
6356 | ||
6357 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6358 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6359 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6360 | goto done; |
6361 | ||
1c2acffb | 6362 | default: |
0c1bc5c6 | 6363 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6364 | break; |
6365 | } | |
1da177e4 LT |
6366 | |
6367 | drop: | |
6368 | kfree_skb(skb); | |
6369 | ||
6370 | done: | |
6be36555 | 6371 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6372 | } |
6373 | ||
84104b24 AE |
6374 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6375 | struct sk_buff *skb) | |
1da177e4 | 6376 | { |
ae4fd2d3 | 6377 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6378 | struct l2cap_chan *chan; |
1da177e4 | 6379 | |
ae4fd2d3 MH |
6380 | if (hcon->type != ACL_LINK) |
6381 | goto drop; | |
6382 | ||
06ae3314 | 6383 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst); |
23691d75 | 6384 | if (!chan) |
1da177e4 LT |
6385 | goto drop; |
6386 | ||
5b4cedaa | 6387 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6388 | |
89bc500e | 6389 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6390 | goto drop; |
6391 | ||
e13e21dc | 6392 | if (chan->imtu < skb->len) |
1da177e4 LT |
6393 | goto drop; |
6394 | ||
2edf870d | 6395 | /* Store remote BD_ADDR and PSM for msg_name */ |
06ae3314 | 6396 | bacpy(&bt_cb(skb)->bdaddr, &hcon->dst); |
2edf870d MH |
6397 | bt_cb(skb)->psm = psm; |
6398 | ||
80b98027 | 6399 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 6400 | return; |
1da177e4 LT |
6401 | |
6402 | drop: | |
6403 | kfree_skb(skb); | |
1da177e4 LT |
6404 | } |
6405 | ||
72f78356 | 6406 | static void l2cap_att_channel(struct l2cap_conn *conn, |
6810fca7 | 6407 | struct sk_buff *skb) |
9f69bda6 | 6408 | { |
b99707d7 | 6409 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6410 | struct l2cap_chan *chan; |
9f69bda6 | 6411 | |
b99707d7 MH |
6412 | if (hcon->type != LE_LINK) |
6413 | goto drop; | |
6414 | ||
af1c0134 | 6415 | chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT, |
06ae3314 | 6416 | &hcon->src, &hcon->dst); |
23691d75 | 6417 | if (!chan) |
9f69bda6 GP |
6418 | goto drop; |
6419 | ||
5b4cedaa | 6420 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 6421 | |
cc8dba2b MH |
6422 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type)) |
6423 | goto drop; | |
6424 | ||
e13e21dc | 6425 | if (chan->imtu < skb->len) |
9f69bda6 GP |
6426 | goto drop; |
6427 | ||
80b98027 | 6428 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 6429 | return; |
9f69bda6 GP |
6430 | |
6431 | drop: | |
6432 | kfree_skb(skb); | |
9f69bda6 GP |
6433 | } |
6434 | ||
1da177e4 LT |
6435 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
6436 | { | |
6437 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
6438 | u16 cid, len; |
6439 | __le16 psm; | |
1da177e4 LT |
6440 | |
6441 | skb_pull(skb, L2CAP_HDR_SIZE); | |
6442 | cid = __le16_to_cpu(lh->cid); | |
6443 | len = __le16_to_cpu(lh->len); | |
6444 | ||
1c2acffb GP |
6445 | if (len != skb->len) { |
6446 | kfree_skb(skb); | |
6447 | return; | |
6448 | } | |
6449 | ||
1da177e4 LT |
6450 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6451 | ||
6452 | switch (cid) { | |
8db4dc46 | 6453 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6454 | l2cap_sig_channel(conn, skb); |
6455 | break; | |
6456 | ||
8db4dc46 | 6457 | case L2CAP_CID_CONN_LESS: |
097db76c | 6458 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6459 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6460 | l2cap_conless_channel(conn, psm, skb); |
6461 | break; | |
6462 | ||
073d1cf3 | 6463 | case L2CAP_CID_ATT: |
72f78356 | 6464 | l2cap_att_channel(conn, skb); |
9f69bda6 GP |
6465 | break; |
6466 | ||
a2877629 MH |
6467 | case L2CAP_CID_LE_SIGNALING: |
6468 | l2cap_le_sig_channel(conn, skb); | |
6469 | break; | |
6470 | ||
b501d6a1 AB |
6471 | case L2CAP_CID_SMP: |
6472 | if (smp_sig_channel(conn, skb)) | |
6473 | l2cap_conn_del(conn->hcon, EACCES); | |
6474 | break; | |
6475 | ||
1da177e4 LT |
6476 | default: |
6477 | l2cap_data_channel(conn, cid, skb); | |
6478 | break; | |
6479 | } | |
6480 | } | |
6481 | ||
6482 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
6483 | ||
686ebf28 | 6484 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
6485 | { |
6486 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 6487 | struct l2cap_chan *c; |
1da177e4 | 6488 | |
6ed93dc6 | 6489 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
6490 | |
6491 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
6492 | read_lock(&chan_list_lock); |
6493 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 6494 | if (c->state != BT_LISTEN) |
1da177e4 LT |
6495 | continue; |
6496 | ||
7eafc59e | 6497 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 6498 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 6499 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 6500 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 6501 | exact++; |
7eafc59e | 6502 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 6503 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 6504 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
6505 | lm2 |= HCI_LM_MASTER; |
6506 | } | |
1da177e4 | 6507 | } |
23691d75 | 6508 | read_unlock(&chan_list_lock); |
1da177e4 LT |
6509 | |
6510 | return exact ? lm1 : lm2; | |
6511 | } | |
6512 | ||
9e664631 | 6513 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 6514 | { |
0139418c MH |
6515 | struct l2cap_conn *conn; |
6516 | ||
6ed93dc6 | 6517 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 6518 | |
1da177e4 | 6519 | if (!status) { |
baf43251 | 6520 | conn = l2cap_conn_add(hcon); |
1da177e4 LT |
6521 | if (conn) |
6522 | l2cap_conn_ready(conn); | |
ba6fc317 | 6523 | } else { |
e175072f | 6524 | l2cap_conn_del(hcon, bt_to_errno(status)); |
ba6fc317 | 6525 | } |
1da177e4 LT |
6526 | } |
6527 | ||
686ebf28 | 6528 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
6529 | { |
6530 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6531 | ||
6532 | BT_DBG("hcon %p", hcon); | |
6533 | ||
686ebf28 | 6534 | if (!conn) |
9f5a0d7b | 6535 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
6536 | return conn->disc_reason; |
6537 | } | |
6538 | ||
9e664631 | 6539 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
6540 | { |
6541 | BT_DBG("hcon %p reason %d", hcon, reason); | |
6542 | ||
e175072f | 6543 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
6544 | } |
6545 | ||
4343478f | 6546 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 6547 | { |
715ec005 | 6548 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
6549 | return; |
6550 | ||
f62e4323 | 6551 | if (encrypt == 0x00) { |
4343478f | 6552 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 6553 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 6554 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 6555 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 6556 | } else { |
4343478f | 6557 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 6558 | __clear_chan_timer(chan); |
f62e4323 MH |
6559 | } |
6560 | } | |
6561 | ||
686ebf28 | 6562 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 6563 | { |
0139418c | 6564 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 6565 | struct l2cap_chan *chan; |
1da177e4 | 6566 | |
0139418c | 6567 | if (!conn) |
1da177e4 | 6568 | return 0; |
0139418c | 6569 | |
89d8b407 | 6570 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 6571 | |
160dc6ac | 6572 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
6573 | if (!status && encrypt) |
6574 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 6575 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
6576 | } |
6577 | ||
3df91ea2 | 6578 | mutex_lock(&conn->chan_lock); |
1da177e4 | 6579 | |
3df91ea2 | 6580 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 6581 | l2cap_chan_lock(chan); |
1da177e4 | 6582 | |
89d8b407 AE |
6583 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
6584 | state_to_string(chan->state)); | |
f1cb9af5 | 6585 | |
78eb2f98 AE |
6586 | if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) { |
6587 | l2cap_chan_unlock(chan); | |
6588 | continue; | |
6589 | } | |
6590 | ||
073d1cf3 | 6591 | if (chan->scid == L2CAP_CID_ATT) { |
f1cb9af5 VCG |
6592 | if (!status && encrypt) { |
6593 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 6594 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
6595 | } |
6596 | ||
6be36555 | 6597 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
6598 | continue; |
6599 | } | |
6600 | ||
96eff46e | 6601 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 6602 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
6603 | continue; |
6604 | } | |
6605 | ||
89bc500e | 6606 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 6607 | chan->state == BT_CONFIG)) { |
d97c899b | 6608 | chan->ops->resume(chan); |
4343478f | 6609 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 6610 | l2cap_chan_unlock(chan); |
9719f8af MH |
6611 | continue; |
6612 | } | |
6613 | ||
89bc500e | 6614 | if (chan->state == BT_CONNECT) { |
b1235d79 | 6615 | if (!status) { |
93c3e8f5 | 6616 | l2cap_start_connection(chan); |
b1235d79 | 6617 | } else { |
ba13ccd9 | 6618 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 6619 | } |
89bc500e | 6620 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 6621 | struct l2cap_conn_rsp rsp; |
df3c3931 | 6622 | __u16 res, stat; |
1da177e4 | 6623 | |
b1235d79 | 6624 | if (!status) { |
bdc25783 | 6625 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
6626 | res = L2CAP_CR_PEND; |
6627 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 6628 | chan->ops->defer(chan); |
df3c3931 | 6629 | } else { |
acdcabf5 | 6630 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
6631 | res = L2CAP_CR_SUCCESS; |
6632 | stat = L2CAP_CS_NO_INFO; | |
6633 | } | |
b1235d79 | 6634 | } else { |
acdcabf5 | 6635 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 6636 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
6637 | res = L2CAP_CR_SEC_BLOCK; |
6638 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
6639 | } |
6640 | ||
fe4128e0 GP |
6641 | rsp.scid = cpu_to_le16(chan->dcid); |
6642 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
6643 | rsp.result = cpu_to_le16(res); |
6644 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 6645 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 6646 | sizeof(rsp), &rsp); |
2d369359 MM |
6647 | |
6648 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
6649 | res == L2CAP_CR_SUCCESS) { | |
6650 | char buf[128]; | |
6651 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
6652 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
6653 | L2CAP_CONF_REQ, | |
6654 | l2cap_build_conf_req(chan, buf), | |
6655 | buf); | |
6656 | chan->num_conf_req++; | |
6657 | } | |
b1235d79 | 6658 | } |
1da177e4 | 6659 | |
6be36555 | 6660 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6661 | } |
6662 | ||
3df91ea2 | 6663 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 6664 | |
1da177e4 LT |
6665 | return 0; |
6666 | } | |
6667 | ||
686ebf28 | 6668 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
6669 | { |
6670 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
6671 | struct l2cap_hdr *hdr; |
6672 | int len; | |
1da177e4 | 6673 | |
1d13a254 AE |
6674 | /* For AMP controller do not create l2cap conn */ |
6675 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
6676 | goto drop; | |
1da177e4 | 6677 | |
5a08ecce | 6678 | if (!conn) |
baf43251 | 6679 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
6680 | |
6681 | if (!conn) | |
1da177e4 LT |
6682 | goto drop; |
6683 | ||
6684 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
6685 | ||
d73a0988 AE |
6686 | switch (flags) { |
6687 | case ACL_START: | |
6688 | case ACL_START_NO_FLUSH: | |
6689 | case ACL_COMPLETE: | |
1da177e4 LT |
6690 | if (conn->rx_len) { |
6691 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
6692 | kfree_skb(conn->rx_skb); | |
6693 | conn->rx_skb = NULL; | |
6694 | conn->rx_len = 0; | |
6695 | l2cap_conn_unreliable(conn, ECOMM); | |
6696 | } | |
6697 | ||
aae7fe22 AE |
6698 | /* Start fragment always begin with Basic L2CAP header */ |
6699 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
6700 | BT_ERR("Frame is too short (len %d)", skb->len); |
6701 | l2cap_conn_unreliable(conn, ECOMM); | |
6702 | goto drop; | |
6703 | } | |
6704 | ||
6705 | hdr = (struct l2cap_hdr *) skb->data; | |
6706 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
6707 | ||
6708 | if (len == skb->len) { | |
6709 | /* Complete frame received */ | |
6710 | l2cap_recv_frame(conn, skb); | |
6711 | return 0; | |
6712 | } | |
6713 | ||
6714 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
6715 | ||
6716 | if (skb->len > len) { | |
6717 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 6718 | skb->len, len); |
1da177e4 LT |
6719 | l2cap_conn_unreliable(conn, ECOMM); |
6720 | goto drop; | |
6721 | } | |
6722 | ||
6723 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 6724 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 6725 | if (!conn->rx_skb) |
1da177e4 LT |
6726 | goto drop; |
6727 | ||
d626f62b | 6728 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6729 | skb->len); |
1da177e4 | 6730 | conn->rx_len = len - skb->len; |
d73a0988 AE |
6731 | break; |
6732 | ||
6733 | case ACL_CONT: | |
1da177e4 LT |
6734 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
6735 | ||
6736 | if (!conn->rx_len) { | |
6737 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
6738 | l2cap_conn_unreliable(conn, ECOMM); | |
6739 | goto drop; | |
6740 | } | |
6741 | ||
6742 | if (skb->len > conn->rx_len) { | |
6743 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 6744 | skb->len, conn->rx_len); |
1da177e4 LT |
6745 | kfree_skb(conn->rx_skb); |
6746 | conn->rx_skb = NULL; | |
6747 | conn->rx_len = 0; | |
6748 | l2cap_conn_unreliable(conn, ECOMM); | |
6749 | goto drop; | |
6750 | } | |
6751 | ||
d626f62b | 6752 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 6753 | skb->len); |
1da177e4 LT |
6754 | conn->rx_len -= skb->len; |
6755 | ||
6756 | if (!conn->rx_len) { | |
c4e5bafa JH |
6757 | /* Complete frame received. l2cap_recv_frame |
6758 | * takes ownership of the skb so set the global | |
6759 | * rx_skb pointer to NULL first. | |
6760 | */ | |
6761 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 6762 | conn->rx_skb = NULL; |
c4e5bafa | 6763 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 6764 | } |
d73a0988 | 6765 | break; |
1da177e4 LT |
6766 | } |
6767 | ||
6768 | drop: | |
6769 | kfree_skb(skb); | |
6770 | return 0; | |
6771 | } | |
6772 | ||
aef7d97c | 6773 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 6774 | { |
23691d75 | 6775 | struct l2cap_chan *c; |
1da177e4 | 6776 | |
333055f2 | 6777 | read_lock(&chan_list_lock); |
1da177e4 | 6778 | |
23691d75 | 6779 | list_for_each_entry(c, &chan_list, global_l) { |
fcb73338 | 6780 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7eafc59e | 6781 | &c->src, &c->dst, |
fcb73338 AE |
6782 | c->state, __le16_to_cpu(c->psm), |
6783 | c->scid, c->dcid, c->imtu, c->omtu, | |
6784 | c->sec_level, c->mode); | |
61e1b4b7 | 6785 | } |
1da177e4 | 6786 | |
333055f2 | 6787 | read_unlock(&chan_list_lock); |
1da177e4 | 6788 | |
aef7d97c | 6789 | return 0; |
1da177e4 LT |
6790 | } |
6791 | ||
aef7d97c MH |
6792 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
6793 | { | |
6794 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
6795 | } | |
6796 | ||
6797 | static const struct file_operations l2cap_debugfs_fops = { | |
6798 | .open = l2cap_debugfs_open, | |
6799 | .read = seq_read, | |
6800 | .llseek = seq_lseek, | |
6801 | .release = single_release, | |
6802 | }; | |
6803 | ||
6804 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 6805 | |
64274518 | 6806 | int __init l2cap_init(void) |
1da177e4 LT |
6807 | { |
6808 | int err; | |
be9d1227 | 6809 | |
bb58f747 | 6810 | err = l2cap_init_sockets(); |
1da177e4 LT |
6811 | if (err < 0) |
6812 | return err; | |
6813 | ||
1120e4bf MH |
6814 | if (IS_ERR_OR_NULL(bt_debugfs)) |
6815 | return 0; | |
6816 | ||
6817 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
6818 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 6819 | |
1da177e4 | 6820 | return 0; |
1da177e4 LT |
6821 | } |
6822 | ||
64274518 | 6823 | void l2cap_exit(void) |
1da177e4 | 6824 | { |
aef7d97c | 6825 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 6826 | l2cap_cleanup_sockets(); |
1da177e4 LT |
6827 | } |
6828 | ||
d1c4a17d GP |
6829 | module_param(disable_ertm, bool, 0644); |
6830 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |