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 | |
0f1bfe4e JH |
44 | #define LE_FLOWCTL_MAX_CREDITS 65535 |
45 | ||
d1de6d46 | 46 | bool disable_ertm; |
f0709e03 | 47 | |
547d1032 | 48 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD; |
d40bffbc | 49 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, }; |
1da177e4 | 50 | |
b5ad8b7f JB |
51 | static LIST_HEAD(chan_list); |
52 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 53 | |
f15b8ecf JH |
54 | static u16 le_max_credits = L2CAP_LE_MAX_CREDITS; |
55 | static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS; | |
56 | ||
1da177e4 | 57 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 58 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 59 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 60 | void *data); |
710f9b0a | 61 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
5e4e3972 | 62 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); |
1da177e4 | 63 | |
d660366d | 64 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2d792818 | 65 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 66 | |
4f1654e0 MH |
67 | static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type) |
68 | { | |
69 | if (hcon->type == LE_LINK) { | |
70 | if (type == ADDR_LE_DEV_PUBLIC) | |
71 | return BDADDR_LE_PUBLIC; | |
72 | else | |
73 | return BDADDR_LE_RANDOM; | |
74 | } | |
75 | ||
76 | return BDADDR_BREDR; | |
77 | } | |
78 | ||
0139418c | 79 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 80 | |
2d792818 GP |
81 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
82 | u16 cid) | |
0139418c | 83 | { |
3df91ea2 | 84 | struct l2cap_chan *c; |
3d57dc68 | 85 | |
3df91ea2 AE |
86 | list_for_each_entry(c, &conn->chan_l, list) { |
87 | if (c->dcid == cid) | |
88 | return c; | |
0139418c | 89 | } |
3df91ea2 | 90 | return NULL; |
0139418c MH |
91 | } |
92 | ||
2d792818 GP |
93 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
94 | u16 cid) | |
0139418c | 95 | { |
3df91ea2 | 96 | struct l2cap_chan *c; |
3d57dc68 | 97 | |
3df91ea2 AE |
98 | list_for_each_entry(c, &conn->chan_l, list) { |
99 | if (c->scid == cid) | |
100 | return c; | |
0139418c | 101 | } |
3df91ea2 | 102 | return NULL; |
0139418c MH |
103 | } |
104 | ||
105 | /* Find channel with given SCID. | |
ef191ade | 106 | * Returns locked channel. */ |
2d792818 GP |
107 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
108 | u16 cid) | |
0139418c | 109 | { |
48454079 | 110 | struct l2cap_chan *c; |
baa7e1fa | 111 | |
3df91ea2 | 112 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 113 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
114 | if (c) |
115 | l2cap_chan_lock(c); | |
3df91ea2 AE |
116 | mutex_unlock(&conn->chan_lock); |
117 | ||
48454079 | 118 | return c; |
0139418c MH |
119 | } |
120 | ||
b1a130b7 MM |
121 | /* Find channel with given DCID. |
122 | * Returns locked channel. | |
123 | */ | |
124 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
125 | u16 cid) | |
126 | { | |
127 | struct l2cap_chan *c; | |
128 | ||
129 | mutex_lock(&conn->chan_lock); | |
130 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
131 | if (c) | |
132 | l2cap_chan_lock(c); | |
133 | mutex_unlock(&conn->chan_lock); | |
134 | ||
135 | return c; | |
136 | } | |
137 | ||
2d792818 GP |
138 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
139 | u8 ident) | |
0139418c | 140 | { |
3df91ea2 | 141 | struct l2cap_chan *c; |
3d57dc68 | 142 | |
3df91ea2 AE |
143 | list_for_each_entry(c, &conn->chan_l, list) { |
144 | if (c->ident == ident) | |
145 | return c; | |
0139418c | 146 | } |
3df91ea2 | 147 | return NULL; |
0139418c MH |
148 | } |
149 | ||
5b155ef9 MM |
150 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
151 | u8 ident) | |
152 | { | |
153 | struct l2cap_chan *c; | |
154 | ||
155 | mutex_lock(&conn->chan_lock); | |
156 | c = __l2cap_get_chan_by_ident(conn, ident); | |
157 | if (c) | |
158 | l2cap_chan_lock(c); | |
159 | mutex_unlock(&conn->chan_lock); | |
160 | ||
161 | return c; | |
162 | } | |
163 | ||
23691d75 | 164 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 165 | { |
23691d75 | 166 | struct l2cap_chan *c; |
9e4425ff | 167 | |
23691d75 | 168 | list_for_each_entry(c, &chan_list, global_l) { |
7eafc59e | 169 | if (c->sport == psm && !bacmp(&c->src, src)) |
250938cb | 170 | return c; |
9e4425ff | 171 | } |
250938cb | 172 | return NULL; |
9e4425ff GP |
173 | } |
174 | ||
175 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
176 | { | |
73b2ec18 GP |
177 | int err; |
178 | ||
333055f2 | 179 | write_lock(&chan_list_lock); |
9e4425ff | 180 | |
23691d75 | 181 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
182 | err = -EADDRINUSE; |
183 | goto done; | |
9e4425ff GP |
184 | } |
185 | ||
73b2ec18 GP |
186 | if (psm) { |
187 | chan->psm = psm; | |
188 | chan->sport = psm; | |
189 | err = 0; | |
190 | } else { | |
191 | u16 p; | |
192 | ||
193 | err = -EINVAL; | |
194 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 195 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
196 | chan->psm = cpu_to_le16(p); |
197 | chan->sport = cpu_to_le16(p); | |
198 | err = 0; | |
199 | break; | |
200 | } | |
201 | } | |
9e4425ff | 202 | |
73b2ec18 | 203 | done: |
333055f2 | 204 | write_unlock(&chan_list_lock); |
73b2ec18 | 205 | return err; |
9e4425ff | 206 | } |
6b8d4a6a | 207 | EXPORT_SYMBOL_GPL(l2cap_add_psm); |
9e4425ff GP |
208 | |
209 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
210 | { | |
333055f2 | 211 | write_lock(&chan_list_lock); |
9e4425ff GP |
212 | |
213 | chan->scid = scid; | |
214 | ||
333055f2 | 215 | write_unlock(&chan_list_lock); |
9e4425ff GP |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
baa7e1fa | 220 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 221 | { |
e77af755 | 222 | u16 cid, dyn_end; |
0139418c | 223 | |
e77af755 JH |
224 | if (conn->hcon->type == LE_LINK) |
225 | dyn_end = L2CAP_CID_LE_DYN_END; | |
226 | else | |
227 | dyn_end = L2CAP_CID_DYN_END; | |
228 | ||
229 | for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) { | |
baa7e1fa | 230 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
231 | return cid; |
232 | } | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
f93fa273 | 237 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 238 | { |
42d2d87c | 239 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 240 | state_to_string(state)); |
badaaa00 | 241 | |
89bc500e | 242 | chan->state = state; |
53f52121 | 243 | chan->ops->state_change(chan, state, 0); |
89bc500e GP |
244 | } |
245 | ||
f8e73017 GP |
246 | static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, |
247 | int state, int err) | |
2e0052e4 | 248 | { |
f8e73017 | 249 | chan->state = state; |
53f52121 | 250 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
251 | } |
252 | ||
253 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
254 | { | |
f8e73017 | 255 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
256 | } |
257 | ||
4239d16f MM |
258 | static void __set_retrans_timer(struct l2cap_chan *chan) |
259 | { | |
260 | if (!delayed_work_pending(&chan->monitor_timer) && | |
261 | chan->retrans_timeout) { | |
262 | l2cap_set_timer(chan, &chan->retrans_timer, | |
263 | msecs_to_jiffies(chan->retrans_timeout)); | |
264 | } | |
265 | } | |
266 | ||
267 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
268 | { | |
269 | __clear_retrans_timer(chan); | |
270 | if (chan->monitor_timeout) { | |
271 | l2cap_set_timer(chan, &chan->monitor_timer, | |
272 | msecs_to_jiffies(chan->monitor_timeout)); | |
273 | } | |
274 | } | |
275 | ||
608bcc6d MM |
276 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
277 | u16 seq) | |
278 | { | |
279 | struct sk_buff *skb; | |
280 | ||
281 | skb_queue_walk(head, skb) { | |
282 | if (bt_cb(skb)->control.txseq == seq) | |
283 | return skb; | |
284 | } | |
285 | ||
286 | return NULL; | |
287 | } | |
288 | ||
3c588192 MM |
289 | /* ---- L2CAP sequence number lists ---- */ |
290 | ||
291 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
292 | * SREJ requests that are received and for frames that are to be | |
293 | * retransmitted. These seq_list functions implement a singly-linked | |
294 | * list in an array, where membership in the list can also be checked | |
295 | * in constant time. Items can also be added to the tail of the list | |
296 | * and removed from the head in constant time, without further memory | |
297 | * allocs or frees. | |
298 | */ | |
299 | ||
300 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
301 | { | |
302 | size_t alloc_size, i; | |
303 | ||
304 | /* Allocated size is a power of 2 to map sequence numbers | |
305 | * (which may be up to 14 bits) in to a smaller array that is | |
306 | * sized for the negotiated ERTM transmit windows. | |
307 | */ | |
308 | alloc_size = roundup_pow_of_two(size); | |
309 | ||
310 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
311 | if (!seq_list->list) | |
312 | return -ENOMEM; | |
313 | ||
314 | seq_list->mask = alloc_size - 1; | |
315 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
316 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
317 | for (i = 0; i < alloc_size; i++) | |
318 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
324 | { | |
325 | kfree(seq_list->list); | |
326 | } | |
327 | ||
328 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
329 | u16 seq) | |
330 | { | |
331 | /* Constant-time check for list membership */ | |
332 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
333 | } | |
334 | ||
03a0c5d6 | 335 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) |
3c588192 | 336 | { |
03a0c5d6 | 337 | u16 seq = seq_list->head; |
3c588192 MM |
338 | u16 mask = seq_list->mask; |
339 | ||
03a0c5d6 JH |
340 | seq_list->head = seq_list->list[seq & mask]; |
341 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
342 | ||
343 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
344 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
345 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 | 346 | } |
3c588192 | 347 | |
03a0c5d6 | 348 | return seq; |
3c588192 MM |
349 | } |
350 | ||
351 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
352 | { | |
f522ae36 | 353 | u16 i; |
3c588192 | 354 | |
f522ae36 GP |
355 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
356 | return; | |
357 | ||
358 | for (i = 0; i <= seq_list->mask; i++) | |
359 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
360 | ||
361 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
362 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
363 | } |
364 | ||
365 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
366 | { | |
367 | u16 mask = seq_list->mask; | |
368 | ||
369 | /* All appends happen in constant time */ | |
370 | ||
f522ae36 GP |
371 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
372 | return; | |
3c588192 | 373 | |
f522ae36 GP |
374 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
375 | seq_list->head = seq; | |
376 | else | |
377 | seq_list->list[seq_list->tail & mask] = seq; | |
378 | ||
379 | seq_list->tail = seq; | |
380 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
381 | } |
382 | ||
721c4181 | 383 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 384 | { |
721c4181 | 385 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 386 | chan_timer.work); |
3df91ea2 | 387 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
388 | int reason; |
389 | ||
e05dcc32 | 390 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 391 | |
3df91ea2 | 392 | mutex_lock(&conn->chan_lock); |
6be36555 | 393 | l2cap_chan_lock(chan); |
ab07801d | 394 | |
89bc500e | 395 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 396 | reason = ECONNREFUSED; |
89bc500e | 397 | else if (chan->state == BT_CONNECT && |
2d792818 | 398 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
399 | reason = ECONNREFUSED; |
400 | else | |
401 | reason = ETIMEDOUT; | |
402 | ||
0f852724 | 403 | l2cap_chan_close(chan, reason); |
ab07801d | 404 | |
6be36555 | 405 | l2cap_chan_unlock(chan); |
ab07801d | 406 | |
80b98027 | 407 | chan->ops->close(chan); |
3df91ea2 AE |
408 | mutex_unlock(&conn->chan_lock); |
409 | ||
371fd835 | 410 | l2cap_chan_put(chan); |
ab07801d GP |
411 | } |
412 | ||
eef1d9b6 | 413 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
414 | { |
415 | struct l2cap_chan *chan; | |
416 | ||
417 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
418 | if (!chan) | |
419 | return NULL; | |
420 | ||
c03b355e AE |
421 | mutex_init(&chan->lock); |
422 | ||
333055f2 | 423 | write_lock(&chan_list_lock); |
23691d75 | 424 | list_add(&chan->global_l, &chan_list); |
333055f2 | 425 | write_unlock(&chan_list_lock); |
23691d75 | 426 | |
721c4181 | 427 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 428 | |
89bc500e GP |
429 | chan->state = BT_OPEN; |
430 | ||
144ad330 | 431 | kref_init(&chan->kref); |
71ba0e56 | 432 | |
2827011f MM |
433 | /* This flag is cleared in l2cap_chan_ready() */ |
434 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
435 | ||
eef1d9b6 | 436 | BT_DBG("chan %p", chan); |
abc545b8 | 437 | |
48454079 GP |
438 | return chan; |
439 | } | |
6b8d4a6a | 440 | EXPORT_SYMBOL_GPL(l2cap_chan_create); |
48454079 | 441 | |
144ad330 | 442 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 443 | { |
144ad330 SS |
444 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
445 | ||
4af66c69 JK |
446 | BT_DBG("chan %p", chan); |
447 | ||
333055f2 | 448 | write_lock(&chan_list_lock); |
23691d75 | 449 | list_del(&chan->global_l); |
333055f2 | 450 | write_unlock(&chan_list_lock); |
23691d75 | 451 | |
4af66c69 | 452 | kfree(chan); |
6ff5abbf GP |
453 | } |
454 | ||
30648372 JK |
455 | void l2cap_chan_hold(struct l2cap_chan *c) |
456 | { | |
144ad330 | 457 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 458 | |
144ad330 | 459 | kref_get(&c->kref); |
30648372 JK |
460 | } |
461 | ||
462 | void l2cap_chan_put(struct l2cap_chan *c) | |
463 | { | |
144ad330 | 464 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 465 | |
144ad330 | 466 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 | 467 | } |
6b8d4a6a | 468 | EXPORT_SYMBOL_GPL(l2cap_chan_put); |
30648372 | 469 | |
bd4b1653 AE |
470 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
471 | { | |
472 | chan->fcs = L2CAP_FCS_CRC16; | |
473 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
474 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
475 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
6a5e8165 JR |
476 | chan->remote_max_tx = chan->max_tx; |
477 | chan->remote_tx_win = chan->tx_win; | |
c20f8e35 | 478 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 | 479 | chan->sec_level = BT_SECURITY_LOW; |
6a5e8165 JR |
480 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
481 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; | |
482 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; | |
483 | chan->conf_state = 0; | |
bd4b1653 AE |
484 | |
485 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
486 | } | |
6b8d4a6a | 487 | EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults); |
bd4b1653 | 488 | |
0ce43ce6 | 489 | static void l2cap_le_flowctl_init(struct l2cap_chan *chan) |
38319713 | 490 | { |
0ce43ce6 JH |
491 | chan->sdu = NULL; |
492 | chan->sdu_last_frag = NULL; | |
493 | chan->sdu_len = 0; | |
0cd75f7e | 494 | chan->tx_credits = 0; |
f15b8ecf | 495 | chan->rx_credits = le_max_credits; |
d1d79413 | 496 | chan->mps = min_t(u16, chan->imtu, le_default_mps); |
0ce43ce6 JH |
497 | |
498 | skb_queue_head_init(&chan->tx_q); | |
38319713 JH |
499 | } |
500 | ||
93c3e8f5 | 501 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 502 | { |
af05b30b | 503 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 504 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 505 | |
9f5a0d7b | 506 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 507 | |
8c1d787b | 508 | chan->conn = conn; |
0139418c | 509 | |
5491120e AE |
510 | switch (chan->chan_type) { |
511 | case L2CAP_CHAN_CONN_ORIENTED: | |
21626e62 JH |
512 | /* Alloc CID for connection-oriented socket */ |
513 | chan->scid = l2cap_alloc_cid(conn); | |
514 | if (conn->hcon->type == ACL_LINK) | |
0c1bc5c6 | 515 | chan->omtu = L2CAP_DEFAULT_MTU; |
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 | ||
2338a7e0 JH |
525 | case L2CAP_CHAN_FIXED: |
526 | /* Caller will set CID and CID specific MTU values */ | |
416fa752 AE |
527 | break; |
528 | ||
5491120e | 529 | default: |
0139418c | 530 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
531 | chan->scid = L2CAP_CID_SIGNALING; |
532 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 533 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
534 | } |
535 | ||
8f7975b1 AE |
536 | chan->local_id = L2CAP_BESTEFFORT_ID; |
537 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
538 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
539 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
540 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 541 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 542 | |
371fd835 | 543 | l2cap_chan_hold(chan); |
baa7e1fa | 544 | |
5ee9891d JH |
545 | hci_conn_hold(conn->hcon); |
546 | ||
3df91ea2 | 547 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
548 | } |
549 | ||
466f8004 | 550 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
551 | { |
552 | mutex_lock(&conn->chan_lock); | |
553 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 554 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
555 | } |
556 | ||
466f8004 | 557 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 558 | { |
8c1d787b | 559 | struct l2cap_conn *conn = chan->conn; |
0139418c | 560 | |
c9b66675 | 561 | __clear_chan_timer(chan); |
0139418c | 562 | |
49208c9c | 563 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 564 | |
8e87d142 | 565 | if (conn) { |
56f60984 | 566 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 567 | /* Delete from channel list */ |
3df91ea2 | 568 | list_del(&chan->list); |
3d57dc68 | 569 | |
371fd835 | 570 | l2cap_chan_put(chan); |
baa7e1fa | 571 | |
8c1d787b | 572 | chan->conn = NULL; |
3cabbfda | 573 | |
2338a7e0 | 574 | if (chan->scid != L2CAP_CID_A2MP) |
76a68ba0 | 575 | hci_conn_drop(conn->hcon); |
56f60984 AE |
576 | |
577 | if (mgr && mgr->bredr_chan == chan) | |
578 | mgr->bredr_chan = NULL; | |
0139418c MH |
579 | } |
580 | ||
419e08c1 AE |
581 | if (chan->hs_hchan) { |
582 | struct hci_chan *hs_hchan = chan->hs_hchan; | |
583 | ||
584 | BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); | |
585 | amp_disconnect_logical_link(hs_hchan); | |
586 | } | |
587 | ||
b699ec0d | 588 | chan->ops->teardown(chan, err); |
6be36555 | 589 | |
2827011f | 590 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 591 | return; |
2ead70b8 | 592 | |
ee556f66 GP |
593 | switch(chan->mode) { |
594 | case L2CAP_MODE_BASIC: | |
595 | break; | |
c13ffa62 | 596 | |
38319713 | 597 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b | 598 | skb_queue_purge(&chan->tx_q); |
38319713 JH |
599 | break; |
600 | ||
ee556f66 | 601 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
602 | __clear_retrans_timer(chan); |
603 | __clear_monitor_timer(chan); | |
604 | __clear_ack_timer(chan); | |
c13ffa62 | 605 | |
f1c6775b | 606 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 607 | |
3c588192 MM |
608 | l2cap_seq_list_free(&chan->srej_list); |
609 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
610 | |
611 | /* fall through */ | |
612 | ||
613 | case L2CAP_MODE_STREAMING: | |
614 | skb_queue_purge(&chan->tx_q); | |
615 | break; | |
c13ffa62 | 616 | } |
ee556f66 GP |
617 | |
618 | return; | |
0139418c | 619 | } |
6b8d4a6a | 620 | EXPORT_SYMBOL_GPL(l2cap_chan_del); |
0139418c | 621 | |
387a33e3 JH |
622 | void l2cap_conn_update_id_addr(struct hci_conn *hcon) |
623 | { | |
624 | struct l2cap_conn *conn = hcon->l2cap_data; | |
625 | struct l2cap_chan *chan; | |
626 | ||
627 | mutex_lock(&conn->chan_lock); | |
628 | ||
629 | list_for_each_entry(chan, &conn->chan_l, list) { | |
630 | l2cap_chan_lock(chan); | |
631 | bacpy(&chan->dst, &hcon->dst); | |
632 | chan->dst_type = bdaddr_type(hcon, hcon->dst_type); | |
633 | l2cap_chan_unlock(chan); | |
634 | } | |
635 | ||
636 | mutex_unlock(&conn->chan_lock); | |
637 | } | |
638 | ||
27e2d4c8 JH |
639 | static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) |
640 | { | |
641 | struct l2cap_conn *conn = chan->conn; | |
642 | struct l2cap_le_conn_rsp rsp; | |
643 | u16 result; | |
644 | ||
645 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
646 | result = L2CAP_CR_AUTHORIZATION; | |
647 | else | |
648 | result = L2CAP_CR_BAD_PSM; | |
649 | ||
650 | l2cap_state_change(chan, BT_DISCONN); | |
651 | ||
652 | rsp.dcid = cpu_to_le16(chan->scid); | |
653 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 654 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 655 | rsp.credits = cpu_to_le16(chan->rx_credits); |
27e2d4c8 JH |
656 | rsp.result = cpu_to_le16(result); |
657 | ||
658 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
659 | &rsp); | |
660 | } | |
661 | ||
791d60f7 JH |
662 | static void l2cap_chan_connect_reject(struct l2cap_chan *chan) |
663 | { | |
664 | struct l2cap_conn *conn = chan->conn; | |
665 | struct l2cap_conn_rsp rsp; | |
666 | u16 result; | |
667 | ||
668 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
669 | result = L2CAP_CR_SEC_BLOCK; | |
670 | else | |
671 | result = L2CAP_CR_BAD_PSM; | |
672 | ||
673 | l2cap_state_change(chan, BT_DISCONN); | |
674 | ||
675 | rsp.scid = cpu_to_le16(chan->dcid); | |
676 | rsp.dcid = cpu_to_le16(chan->scid); | |
677 | rsp.result = cpu_to_le16(result); | |
dcf4adbf | 678 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
791d60f7 JH |
679 | |
680 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
681 | } | |
682 | ||
0f852724 | 683 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
684 | { |
685 | struct l2cap_conn *conn = chan->conn; | |
4519de9a | 686 | |
7eafc59e | 687 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
4519de9a | 688 | |
89bc500e | 689 | switch (chan->state) { |
4519de9a | 690 | case BT_LISTEN: |
b699ec0d | 691 | chan->ops->teardown(chan, 0); |
4519de9a GP |
692 | break; |
693 | ||
694 | case BT_CONNECTED: | |
695 | case BT_CONFIG: | |
7b25c9b3 | 696 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
8d836d71 | 697 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
5e4e3972 | 698 | l2cap_send_disconn_req(chan, reason); |
4519de9a GP |
699 | } else |
700 | l2cap_chan_del(chan, reason); | |
701 | break; | |
702 | ||
703 | case BT_CONNECT2: | |
791d60f7 JH |
704 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
705 | if (conn->hcon->type == ACL_LINK) | |
706 | l2cap_chan_connect_reject(chan); | |
27e2d4c8 JH |
707 | else if (conn->hcon->type == LE_LINK) |
708 | l2cap_chan_le_connect_reject(chan); | |
4519de9a GP |
709 | } |
710 | ||
711 | l2cap_chan_del(chan, reason); | |
712 | break; | |
713 | ||
714 | case BT_CONNECT: | |
715 | case BT_DISCONN: | |
716 | l2cap_chan_del(chan, reason); | |
717 | break; | |
718 | ||
719 | default: | |
b699ec0d | 720 | chan->ops->teardown(chan, 0); |
4519de9a GP |
721 | break; |
722 | } | |
723 | } | |
6b8d4a6a | 724 | EXPORT_SYMBOL(l2cap_chan_close); |
4519de9a | 725 | |
4343478f | 726 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 727 | { |
6a974b50 MH |
728 | switch (chan->chan_type) { |
729 | case L2CAP_CHAN_RAW: | |
4343478f | 730 | switch (chan->sec_level) { |
8556edd3 | 731 | case BT_SECURITY_HIGH: |
7d513e92 | 732 | case BT_SECURITY_FIPS: |
8556edd3 JH |
733 | return HCI_AT_DEDICATED_BONDING_MITM; |
734 | case BT_SECURITY_MEDIUM: | |
735 | return HCI_AT_DEDICATED_BONDING; | |
736 | default: | |
737 | return HCI_AT_NO_BONDING; | |
738 | } | |
6a974b50 | 739 | break; |
3124b843 | 740 | case L2CAP_CHAN_CONN_LESS: |
dcf4adbf | 741 | if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) { |
3124b843 MH |
742 | if (chan->sec_level == BT_SECURITY_LOW) |
743 | chan->sec_level = BT_SECURITY_SDP; | |
744 | } | |
7d513e92 MH |
745 | if (chan->sec_level == BT_SECURITY_HIGH || |
746 | chan->sec_level == BT_SECURITY_FIPS) | |
3124b843 MH |
747 | return HCI_AT_NO_BONDING_MITM; |
748 | else | |
749 | return HCI_AT_NO_BONDING; | |
750 | break; | |
6a974b50 | 751 | case L2CAP_CHAN_CONN_ORIENTED: |
dcf4adbf | 752 | if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) { |
6a974b50 MH |
753 | if (chan->sec_level == BT_SECURITY_LOW) |
754 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 755 | |
7d513e92 MH |
756 | if (chan->sec_level == BT_SECURITY_HIGH || |
757 | chan->sec_level == BT_SECURITY_FIPS) | |
6a974b50 MH |
758 | return HCI_AT_NO_BONDING_MITM; |
759 | else | |
760 | return HCI_AT_NO_BONDING; | |
761 | } | |
762 | /* fall through */ | |
763 | default: | |
4343478f | 764 | switch (chan->sec_level) { |
00ae4af9 | 765 | case BT_SECURITY_HIGH: |
7d513e92 | 766 | case BT_SECURITY_FIPS: |
8556edd3 | 767 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 768 | case BT_SECURITY_MEDIUM: |
8556edd3 | 769 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 770 | default: |
8556edd3 | 771 | return HCI_AT_NO_BONDING; |
00ae4af9 | 772 | } |
6a974b50 | 773 | break; |
0684e5f9 | 774 | } |
8556edd3 JH |
775 | } |
776 | ||
777 | /* Service level security */ | |
d45fc423 | 778 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 779 | { |
8c1d787b | 780 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
781 | __u8 auth_type; |
782 | ||
a17de2fe JH |
783 | if (conn->hcon->type == LE_LINK) |
784 | return smp_conn_security(conn->hcon, chan->sec_level); | |
785 | ||
4343478f | 786 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 787 | |
4343478f | 788 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
789 | } |
790 | ||
b5ad8b7f | 791 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
792 | { |
793 | u8 id; | |
794 | ||
795 | /* Get next available identificator. | |
796 | * 1 - 128 are used by kernel. | |
797 | * 129 - 199 are reserved. | |
798 | * 200 - 254 are used by utilities like l2ping, etc. | |
799 | */ | |
800 | ||
333055f2 | 801 | spin_lock(&conn->lock); |
4e8402a3 MH |
802 | |
803 | if (++conn->tx_ident > 128) | |
804 | conn->tx_ident = 1; | |
805 | ||
806 | id = conn->tx_ident; | |
807 | ||
333055f2 | 808 | spin_unlock(&conn->lock); |
4e8402a3 MH |
809 | |
810 | return id; | |
811 | } | |
812 | ||
2d792818 GP |
813 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
814 | void *data) | |
4e8402a3 MH |
815 | { |
816 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 817 | u8 flags; |
4e8402a3 MH |
818 | |
819 | BT_DBG("code 0x%2.2x", code); | |
820 | ||
821 | if (!skb) | |
9a9c6a34 | 822 | return; |
4e8402a3 | 823 | |
e702112f AE |
824 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
825 | flags = ACL_START_NO_FLUSH; | |
826 | else | |
827 | flags = ACL_START; | |
828 | ||
14b12d0b | 829 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 830 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 831 | |
73d80deb LAD |
832 | hci_send_acl(conn->hchan, skb, flags); |
833 | } | |
834 | ||
02b0fbb9 MM |
835 | static bool __chan_is_moving(struct l2cap_chan *chan) |
836 | { | |
837 | return chan->move_state != L2CAP_MOVE_STABLE && | |
838 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
839 | } | |
840 | ||
73d80deb LAD |
841 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
842 | { | |
843 | struct hci_conn *hcon = chan->conn->hcon; | |
844 | u16 flags; | |
845 | ||
846 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 847 | skb->priority); |
73d80deb | 848 | |
d5f8a75d MM |
849 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
850 | if (chan->hs_hchan) | |
851 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
852 | else | |
853 | kfree_skb(skb); | |
854 | ||
855 | return; | |
856 | } | |
857 | ||
73d80deb | 858 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
2d792818 | 859 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
860 | flags = ACL_START_NO_FLUSH; |
861 | else | |
862 | flags = ACL_START; | |
14b12d0b | 863 | |
73d80deb LAD |
864 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
865 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
866 | } |
867 | ||
b76bbd66 MM |
868 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
869 | { | |
870 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
871 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
872 | ||
873 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
874 | /* S-Frame */ | |
875 | control->sframe = 1; | |
876 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
877 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
878 | ||
879 | control->sar = 0; | |
880 | control->txseq = 0; | |
881 | } else { | |
882 | /* I-Frame */ | |
883 | control->sframe = 0; | |
884 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
885 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
886 | ||
887 | control->poll = 0; | |
888 | control->super = 0; | |
889 | } | |
890 | } | |
891 | ||
b76bbd66 MM |
892 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
893 | { | |
894 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
895 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
896 | ||
897 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
898 | /* S-Frame */ | |
899 | control->sframe = 1; | |
900 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
901 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
902 | ||
903 | control->sar = 0; | |
904 | control->txseq = 0; | |
905 | } else { | |
906 | /* I-Frame */ | |
907 | control->sframe = 0; | |
908 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
909 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
910 | ||
911 | control->poll = 0; | |
912 | control->super = 0; | |
913 | } | |
914 | } | |
915 | ||
916 | static inline void __unpack_control(struct l2cap_chan *chan, | |
917 | struct sk_buff *skb) | |
918 | { | |
919 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
920 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
921 | &bt_cb(skb)->control); | |
cec8ab6e | 922 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
923 | } else { |
924 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
925 | &bt_cb(skb)->control); | |
cec8ab6e | 926 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
927 | } |
928 | } | |
929 | ||
b5c6aaed MM |
930 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
931 | { | |
932 | u32 packed; | |
933 | ||
934 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
935 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
936 | ||
937 | if (control->sframe) { | |
938 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
939 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
940 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
941 | } else { | |
942 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
943 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
944 | } | |
945 | ||
946 | return packed; | |
947 | } | |
948 | ||
949 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
950 | { | |
951 | u16 packed; | |
952 | ||
953 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
954 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
955 | ||
956 | if (control->sframe) { | |
957 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
958 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
959 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
960 | } else { | |
961 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
962 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
963 | } | |
964 | ||
965 | return packed; | |
966 | } | |
967 | ||
b76bbd66 MM |
968 | static inline void __pack_control(struct l2cap_chan *chan, |
969 | struct l2cap_ctrl *control, | |
970 | struct sk_buff *skb) | |
971 | { | |
972 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
973 | put_unaligned_le32(__pack_extended_control(control), | |
974 | skb->data + L2CAP_HDR_SIZE); | |
975 | } else { | |
976 | put_unaligned_le16(__pack_enhanced_control(control), | |
977 | skb->data + L2CAP_HDR_SIZE); | |
978 | } | |
979 | } | |
980 | ||
ba7aa64f GP |
981 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
982 | { | |
983 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
984 | return L2CAP_EXT_HDR_SIZE; | |
985 | else | |
986 | return L2CAP_ENH_HDR_SIZE; | |
987 | } | |
988 | ||
a67d7f6f MM |
989 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
990 | u32 control) | |
b5c6aaed MM |
991 | { |
992 | struct sk_buff *skb; | |
993 | struct l2cap_hdr *lh; | |
ba7aa64f | 994 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
995 | |
996 | if (chan->fcs == L2CAP_FCS_CRC16) | |
997 | hlen += L2CAP_FCS_SIZE; | |
998 | ||
a67d7f6f | 999 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 1000 | |
b5c6aaed | 1001 | if (!skb) |
a67d7f6f | 1002 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
1003 | |
1004 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1005 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
1006 | lh->cid = cpu_to_le16(chan->dcid); | |
1007 | ||
a67d7f6f MM |
1008 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1009 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
1010 | else | |
1011 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
1012 | |
1013 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 1014 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
1015 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
1016 | } | |
1017 | ||
1018 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
1019 | return skb; |
1020 | } | |
1021 | ||
1022 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
1023 | struct l2cap_ctrl *control) | |
1024 | { | |
1025 | struct sk_buff *skb; | |
1026 | u32 control_field; | |
1027 | ||
1028 | BT_DBG("chan %p, control %p", chan, control); | |
1029 | ||
1030 | if (!control->sframe) | |
1031 | return; | |
1032 | ||
b99e13ad MM |
1033 | if (__chan_is_moving(chan)) |
1034 | return; | |
1035 | ||
a67d7f6f MM |
1036 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
1037 | !control->poll) | |
1038 | control->final = 1; | |
1039 | ||
1040 | if (control->super == L2CAP_SUPER_RR) | |
1041 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
1042 | else if (control->super == L2CAP_SUPER_RNR) | |
1043 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
1044 | ||
1045 | if (control->super != L2CAP_SUPER_SREJ) { | |
1046 | chan->last_acked_seq = control->reqseq; | |
1047 | __clear_ack_timer(chan); | |
1048 | } | |
1049 | ||
1050 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
1051 | control->final, control->poll, control->super); | |
1052 | ||
1053 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1054 | control_field = __pack_extended_control(control); | |
1055 | else | |
1056 | control_field = __pack_enhanced_control(control); | |
1057 | ||
1058 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
1059 | if (!IS_ERR(skb)) | |
1060 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
1061 | } |
1062 | ||
c9e3d5e0 | 1063 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 1064 | { |
c9e3d5e0 MM |
1065 | struct l2cap_ctrl control; |
1066 | ||
1067 | BT_DBG("chan %p, poll %d", chan, poll); | |
1068 | ||
1069 | memset(&control, 0, sizeof(control)); | |
1070 | control.sframe = 1; | |
1071 | control.poll = poll; | |
1072 | ||
1073 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
1074 | control.super = L2CAP_SUPER_RNR; | |
1075 | else | |
1076 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1077 | |
c9e3d5e0 MM |
1078 | control.reqseq = chan->buffer_seq; |
1079 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1080 | } |
1081 | ||
b4450035 | 1082 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1083 | { |
c1360a1c | 1084 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1085 | } |
1086 | ||
1df7b17a | 1087 | static bool __amp_capable(struct l2cap_chan *chan) |
80d58d0b | 1088 | { |
1df7b17a | 1089 | struct l2cap_conn *conn = chan->conn; |
80d58d0b | 1090 | struct hci_dev *hdev; |
1df7b17a MH |
1091 | bool amp_available = false; |
1092 | ||
1093 | if (!conn->hs_enabled) | |
1094 | return false; | |
1095 | ||
1096 | if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP)) | |
1097 | return false; | |
80d58d0b MH |
1098 | |
1099 | read_lock(&hci_dev_list_lock); | |
1df7b17a | 1100 | list_for_each_entry(hdev, &hci_dev_list, list) { |
80d58d0b | 1101 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1df7b17a MH |
1102 | test_bit(HCI_UP, &hdev->flags)) { |
1103 | amp_available = true; | |
1104 | break; | |
1105 | } | |
1106 | } | |
80d58d0b MH |
1107 | read_unlock(&hci_dev_list_lock); |
1108 | ||
1df7b17a MH |
1109 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1110 | return amp_available; | |
848566b3 MH |
1111 | |
1112 | return false; | |
93c3e8f5 AE |
1113 | } |
1114 | ||
5ce66b59 AE |
1115 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1116 | { | |
1117 | /* Check EFS parameters */ | |
1118 | return true; | |
1119 | } | |
1120 | ||
2766be48 | 1121 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1122 | { |
1123 | struct l2cap_conn *conn = chan->conn; | |
1124 | struct l2cap_conn_req req; | |
1125 | ||
1126 | req.scid = cpu_to_le16(chan->scid); | |
1127 | req.psm = chan->psm; | |
1128 | ||
1129 | chan->ident = l2cap_get_ident(conn); | |
1130 | ||
1131 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1132 | ||
1133 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1134 | } | |
1135 | ||
8eb200bd MM |
1136 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1137 | { | |
1138 | struct l2cap_create_chan_req req; | |
1139 | req.scid = cpu_to_le16(chan->scid); | |
1140 | req.psm = chan->psm; | |
1141 | req.amp_id = amp_id; | |
1142 | ||
1143 | chan->ident = l2cap_get_ident(chan->conn); | |
1144 | ||
1145 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1146 | sizeof(req), &req); | |
1147 | } | |
1148 | ||
02b0fbb9 MM |
1149 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1150 | { | |
1151 | struct sk_buff *skb; | |
1152 | ||
1153 | BT_DBG("chan %p", chan); | |
1154 | ||
1155 | if (chan->mode != L2CAP_MODE_ERTM) | |
1156 | return; | |
1157 | ||
1158 | __clear_retrans_timer(chan); | |
1159 | __clear_monitor_timer(chan); | |
1160 | __clear_ack_timer(chan); | |
1161 | ||
1162 | chan->retry_count = 0; | |
1163 | skb_queue_walk(&chan->tx_q, skb) { | |
1164 | if (bt_cb(skb)->control.retries) | |
1165 | bt_cb(skb)->control.retries = 1; | |
1166 | else | |
1167 | break; | |
1168 | } | |
1169 | ||
1170 | chan->expected_tx_seq = chan->buffer_seq; | |
1171 | ||
1172 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1173 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1174 | l2cap_seq_list_clear(&chan->retrans_list); | |
1175 | l2cap_seq_list_clear(&chan->srej_list); | |
1176 | skb_queue_purge(&chan->srej_q); | |
1177 | ||
1178 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1179 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1180 | ||
1181 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1182 | } | |
1183 | ||
5f3847a4 MM |
1184 | static void l2cap_move_done(struct l2cap_chan *chan) |
1185 | { | |
1186 | u8 move_role = chan->move_role; | |
1187 | BT_DBG("chan %p", chan); | |
1188 | ||
1189 | chan->move_state = L2CAP_MOVE_STABLE; | |
1190 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1191 | ||
1192 | if (chan->mode != L2CAP_MODE_ERTM) | |
1193 | return; | |
1194 | ||
1195 | switch (move_role) { | |
1196 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1197 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1198 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1199 | break; | |
1200 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1201 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1202 | break; | |
1203 | } | |
1204 | } | |
1205 | ||
9f0caeb1 VCG |
1206 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1207 | { | |
2827011f | 1208 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1209 | chan->conf_state = 0; |
1210 | __clear_chan_timer(chan); | |
1211 | ||
0ce43ce6 JH |
1212 | if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) |
1213 | chan->ops->suspend(chan); | |
177f8f2b | 1214 | |
54a59aa2 | 1215 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1216 | |
fd83e2c2 | 1217 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1218 | } |
1219 | ||
f1496dee JH |
1220 | static void l2cap_le_connect(struct l2cap_chan *chan) |
1221 | { | |
1222 | struct l2cap_conn *conn = chan->conn; | |
1223 | struct l2cap_le_conn_req req; | |
1224 | ||
595177f3 JH |
1225 | if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags)) |
1226 | return; | |
1227 | ||
f1496dee JH |
1228 | req.psm = chan->psm; |
1229 | req.scid = cpu_to_le16(chan->scid); | |
1230 | req.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 1231 | req.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 1232 | req.credits = cpu_to_le16(chan->rx_credits); |
f1496dee JH |
1233 | |
1234 | chan->ident = l2cap_get_ident(conn); | |
1235 | ||
1236 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, | |
1237 | sizeof(req), &req); | |
1238 | } | |
1239 | ||
1240 | static void l2cap_le_start(struct l2cap_chan *chan) | |
1241 | { | |
1242 | struct l2cap_conn *conn = chan->conn; | |
1243 | ||
1244 | if (!smp_conn_security(conn->hcon, chan->sec_level)) | |
1245 | return; | |
1246 | ||
1247 | if (!chan->psm) { | |
1248 | l2cap_chan_ready(chan); | |
1249 | return; | |
1250 | } | |
1251 | ||
1252 | if (chan->state == BT_CONNECT) | |
1253 | l2cap_le_connect(chan); | |
1254 | } | |
1255 | ||
93c3e8f5 AE |
1256 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1257 | { | |
1258 | if (__amp_capable(chan)) { | |
1259 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1260 | a2mp_discover_amp(chan); | |
f1496dee JH |
1261 | } else if (chan->conn->hcon->type == LE_LINK) { |
1262 | l2cap_le_start(chan); | |
93c3e8f5 AE |
1263 | } else { |
1264 | l2cap_send_conn_req(chan); | |
1265 | } | |
1266 | } | |
1267 | ||
fc7f8a7e | 1268 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1269 | { |
8c1d787b | 1270 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1271 | |
9f0caeb1 | 1272 | if (conn->hcon->type == LE_LINK) { |
96ac34fb | 1273 | l2cap_le_start(chan); |
9f0caeb1 VCG |
1274 | return; |
1275 | } | |
1276 | ||
79d554a6 | 1277 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1278 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1279 | return; | |
1280 | ||
d45fc423 | 1281 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1282 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1283 | l2cap_start_connection(chan); |
1284 | } | |
79d554a6 MH |
1285 | } else { |
1286 | struct l2cap_info_req req; | |
dcf4adbf | 1287 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1288 | |
1289 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1290 | conn->info_ident = l2cap_get_ident(conn); | |
1291 | ||
ba13ccd9 | 1292 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1293 | |
2d792818 GP |
1294 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1295 | sizeof(req), &req); | |
79d554a6 MH |
1296 | } |
1297 | } | |
1298 | ||
cf6c2c0b GP |
1299 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1300 | { | |
1301 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1302 | if (!disable_ertm) |
cf6c2c0b GP |
1303 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1304 | ||
1305 | switch (mode) { | |
1306 | case L2CAP_MODE_ERTM: | |
1307 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1308 | case L2CAP_MODE_STREAMING: | |
1309 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1310 | default: | |
1311 | return 0x00; | |
1312 | } | |
1313 | } | |
1314 | ||
5e4e3972 | 1315 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1316 | { |
5e4e3972 | 1317 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1318 | struct l2cap_disconn_req req; |
1319 | ||
c13ffa62 GP |
1320 | if (!conn) |
1321 | return; | |
1322 | ||
aad3d0e3 | 1323 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1324 | __clear_retrans_timer(chan); |
1325 | __clear_monitor_timer(chan); | |
1326 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1327 | } |
1328 | ||
2338a7e0 | 1329 | if (chan->scid == L2CAP_CID_A2MP) { |
d117773c | 1330 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1331 | return; |
1332 | } | |
1333 | ||
fe4128e0 GP |
1334 | req.dcid = cpu_to_le16(chan->dcid); |
1335 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1336 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1337 | sizeof(req), &req); | |
c13ffa62 | 1338 | |
f8e73017 | 1339 | l2cap_state_change_and_error(chan, BT_DISCONN, err); |
22121fc9 GP |
1340 | } |
1341 | ||
1da177e4 | 1342 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1343 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1344 | { | |
3df91ea2 | 1345 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1346 | |
1347 | BT_DBG("conn %p", conn); | |
1348 | ||
3df91ea2 | 1349 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1350 | |
3df91ea2 | 1351 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6be36555 | 1352 | l2cap_chan_lock(chan); |
4e8402a3 | 1353 | |
715ec005 | 1354 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1355 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1356 | continue; |
1357 | } | |
1358 | ||
89bc500e | 1359 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1360 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1361 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1362 | l2cap_chan_unlock(chan); |
47731de7 GP |
1363 | continue; |
1364 | } | |
79d554a6 | 1365 | |
c1360a1c | 1366 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1367 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1368 | &chan->conf_state)) { |
89bc500e | 1369 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1370 | l2cap_chan_unlock(chan); |
47731de7 | 1371 | continue; |
b1235d79 | 1372 | } |
47731de7 | 1373 | |
93c3e8f5 | 1374 | l2cap_start_connection(chan); |
47731de7 | 1375 | |
89bc500e | 1376 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1377 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1378 | char buf[128]; |
fe4128e0 GP |
1379 | rsp.scid = cpu_to_le16(chan->dcid); |
1380 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1381 | |
d45fc423 | 1382 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 1383 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
dcf4adbf JP |
1384 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1385 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1386 | chan->ops->defer(chan); |
f66dc81f MH |
1387 | |
1388 | } else { | |
acdcabf5 | 1389 | l2cap_state_change(chan, BT_CONFIG); |
dcf4adbf JP |
1390 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1391 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1392 | } |
79d554a6 | 1393 | } else { |
dcf4adbf JP |
1394 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1395 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1396 | } |
1397 | ||
fc7f8a7e | 1398 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1399 | sizeof(rsp), &rsp); |
e9aeb2dd | 1400 | |
c1360a1c | 1401 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1402 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1403 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1404 | continue; |
1405 | } | |
1406 | ||
c1360a1c | 1407 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1408 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1409 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1410 | chan->num_conf_req++; |
4e8402a3 MH |
1411 | } |
1412 | ||
6be36555 | 1413 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1414 | } |
1415 | ||
3df91ea2 | 1416 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1417 | } |
1418 | ||
c2287681 | 1419 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1420 | * Returns closest match, locked. |
1421 | */ | |
d9b88702 | 1422 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1423 | bdaddr_t *src, |
1424 | bdaddr_t *dst) | |
b62f328b | 1425 | { |
23691d75 | 1426 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1427 | |
23691d75 | 1428 | read_lock(&chan_list_lock); |
b62f328b | 1429 | |
23691d75 | 1430 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1431 | if (state && c->state != state) |
b62f328b VT |
1432 | continue; |
1433 | ||
23691d75 | 1434 | if (c->scid == cid) { |
c2287681 IY |
1435 | int src_match, dst_match; |
1436 | int src_any, dst_any; | |
1437 | ||
b62f328b | 1438 | /* Exact match. */ |
7eafc59e MH |
1439 | src_match = !bacmp(&c->src, src); |
1440 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1441 | if (src_match && dst_match) { |
23691d75 GP |
1442 | read_unlock(&chan_list_lock); |
1443 | return c; | |
1444 | } | |
b62f328b VT |
1445 | |
1446 | /* Closest match */ | |
7eafc59e MH |
1447 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1448 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1449 | if ((src_match && dst_any) || (src_any && dst_match) || |
1450 | (src_any && dst_any)) | |
23691d75 | 1451 | c1 = c; |
b62f328b VT |
1452 | } |
1453 | } | |
280f294f | 1454 | |
23691d75 | 1455 | read_unlock(&chan_list_lock); |
b62f328b | 1456 | |
23691d75 | 1457 | return c1; |
b62f328b VT |
1458 | } |
1459 | ||
1460 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1461 | { | |
cc8dba2b | 1462 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 1463 | struct l2cap_chan *chan, *pchan; |
cc8dba2b | 1464 | u8 dst_type; |
b62f328b VT |
1465 | |
1466 | BT_DBG(""); | |
1467 | ||
1468 | /* Check if we have socket listening on cid */ | |
073d1cf3 | 1469 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT, |
cc8dba2b | 1470 | &hcon->src, &hcon->dst); |
23691d75 | 1471 | if (!pchan) |
b62f328b VT |
1472 | return; |
1473 | ||
44f3b0fb JH |
1474 | /* Client ATT sockets should override the server one */ |
1475 | if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT)) | |
1476 | return; | |
1477 | ||
cc8dba2b MH |
1478 | dst_type = bdaddr_type(hcon, hcon->dst_type); |
1479 | ||
1480 | /* If device is blocked, do not create a channel for it */ | |
1481 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type)) | |
1482 | return; | |
1483 | ||
80afeb6c MH |
1484 | /* For LE slave connections, make sure the connection interval |
1485 | * is in the range of the minium and maximum interval that has | |
1486 | * been configured for this connection. If not, then trigger | |
1487 | * the connection update procedure. | |
1488 | */ | |
4dae2798 | 1489 | if (!test_bit(HCI_CONN_MASTER, &hcon->flags) && |
80afeb6c MH |
1490 | (hcon->le_conn_interval < hcon->le_conn_min_interval || |
1491 | hcon->le_conn_interval > hcon->le_conn_max_interval)) { | |
1492 | struct l2cap_conn_param_update_req req; | |
1493 | ||
1494 | req.min = cpu_to_le16(hcon->le_conn_min_interval); | |
1495 | req.max = cpu_to_le16(hcon->le_conn_max_interval); | |
1496 | req.latency = cpu_to_le16(hcon->le_conn_latency); | |
1497 | req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout); | |
1498 | ||
1499 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
1500 | L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req); | |
1501 | } | |
1502 | ||
8ffb9290 | 1503 | l2cap_chan_lock(pchan); |
62f3a2cf | 1504 | |
80b98027 | 1505 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1506 | if (!chan) |
b62f328b VT |
1507 | goto clean; |
1508 | ||
cc8dba2b MH |
1509 | bacpy(&chan->src, &hcon->src); |
1510 | bacpy(&chan->dst, &hcon->dst); | |
1511 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
1512 | chan->dst_type = dst_type; | |
b62f328b | 1513 | |
44f3b0fb | 1514 | __l2cap_chan_add(conn, chan); |
48454079 | 1515 | |
b62f328b | 1516 | clean: |
8ffb9290 | 1517 | l2cap_chan_unlock(pchan); |
b62f328b VT |
1518 | } |
1519 | ||
4e8402a3 MH |
1520 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1521 | { | |
48454079 | 1522 | struct l2cap_chan *chan; |
cc110922 | 1523 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1524 | |
79d554a6 | 1525 | BT_DBG("conn %p", conn); |
4e8402a3 | 1526 | |
d8729922 JH |
1527 | /* For outgoing pairing which doesn't necessarily have an |
1528 | * associated socket (e.g. mgmt_pair_device). | |
1529 | */ | |
cc110922 VCG |
1530 | if (hcon->out && hcon->type == LE_LINK) |
1531 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1532 | |
3df91ea2 | 1533 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1534 | |
44f3b0fb JH |
1535 | if (hcon->type == LE_LINK) |
1536 | l2cap_le_conn_ready(conn); | |
1537 | ||
3df91ea2 | 1538 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1539 | |
6be36555 | 1540 | l2cap_chan_lock(chan); |
4e8402a3 | 1541 | |
2338a7e0 | 1542 | if (chan->scid == L2CAP_CID_A2MP) { |
416fa752 AE |
1543 | l2cap_chan_unlock(chan); |
1544 | continue; | |
1545 | } | |
1546 | ||
cc110922 | 1547 | if (hcon->type == LE_LINK) { |
f1496dee | 1548 | l2cap_le_start(chan); |
63128451 | 1549 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
74e75740 | 1550 | l2cap_chan_ready(chan); |
b501d6a1 | 1551 | |
1c244f79 | 1552 | } else if (chan->state == BT_CONNECT) { |
fc7f8a7e | 1553 | l2cap_do_start(chan); |
1c244f79 | 1554 | } |
4e8402a3 | 1555 | |
6be36555 | 1556 | l2cap_chan_unlock(chan); |
4e8402a3 | 1557 | } |
79d554a6 | 1558 | |
3df91ea2 | 1559 | mutex_unlock(&conn->chan_lock); |
61a939c6 JH |
1560 | |
1561 | queue_work(hcon->hdev->workqueue, &conn->pending_rx_work); | |
4e8402a3 MH |
1562 | } |
1563 | ||
1564 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1565 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1566 | { | |
48454079 | 1567 | struct l2cap_chan *chan; |
4e8402a3 MH |
1568 | |
1569 | BT_DBG("conn %p", conn); | |
1570 | ||
3df91ea2 | 1571 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1572 | |
3df91ea2 | 1573 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1574 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1575 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1576 | } |
1577 | ||
3df91ea2 | 1578 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1579 | } |
1580 | ||
f878fcad | 1581 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1582 | { |
f878fcad | 1583 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1584 | info_timer.work); |
4e8402a3 | 1585 | |
984947dc | 1586 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1587 | conn->info_ident = 0; |
984947dc | 1588 | |
4e8402a3 MH |
1589 | l2cap_conn_start(conn); |
1590 | } | |
1591 | ||
2c8e1411 DH |
1592 | /* |
1593 | * l2cap_user | |
1594 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1595 | * callback is called during registration. The ->remove callback is called | |
1596 | * during unregistration. | |
1597 | * An l2cap_user object can either be explicitly unregistered or when the | |
1598 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1599 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1600 | * External modules must own a reference to the l2cap_conn object if they intend | |
1601 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1602 | * any time if they don't. | |
1603 | */ | |
1604 | ||
1605 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1606 | { | |
1607 | struct hci_dev *hdev = conn->hcon->hdev; | |
1608 | int ret; | |
1609 | ||
1610 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1611 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1612 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1613 | * relies on the parent hci_conn object to be locked. This itself relies | |
1614 | * on the hci_dev object to be locked. So we must lock the hci device | |
1615 | * here, too. */ | |
1616 | ||
1617 | hci_dev_lock(hdev); | |
1618 | ||
1619 | if (user->list.next || user->list.prev) { | |
1620 | ret = -EINVAL; | |
1621 | goto out_unlock; | |
1622 | } | |
1623 | ||
1624 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1625 | if (!conn->hchan) { | |
1626 | ret = -ENODEV; | |
1627 | goto out_unlock; | |
1628 | } | |
1629 | ||
1630 | ret = user->probe(conn, user); | |
1631 | if (ret) | |
1632 | goto out_unlock; | |
1633 | ||
1634 | list_add(&user->list, &conn->users); | |
1635 | ret = 0; | |
1636 | ||
1637 | out_unlock: | |
1638 | hci_dev_unlock(hdev); | |
1639 | return ret; | |
1640 | } | |
1641 | EXPORT_SYMBOL(l2cap_register_user); | |
1642 | ||
1643 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1644 | { | |
1645 | struct hci_dev *hdev = conn->hcon->hdev; | |
1646 | ||
1647 | hci_dev_lock(hdev); | |
1648 | ||
1649 | if (!user->list.next || !user->list.prev) | |
1650 | goto out_unlock; | |
1651 | ||
1652 | list_del(&user->list); | |
1653 | user->list.next = NULL; | |
1654 | user->list.prev = NULL; | |
1655 | user->remove(conn, user); | |
1656 | ||
1657 | out_unlock: | |
1658 | hci_dev_unlock(hdev); | |
1659 | } | |
1660 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1661 | ||
1662 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1663 | { | |
1664 | struct l2cap_user *user; | |
1665 | ||
1666 | while (!list_empty(&conn->users)) { | |
1667 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1668 | list_del(&user->list); | |
1669 | user->list.next = NULL; | |
1670 | user->list.prev = NULL; | |
1671 | user->remove(conn, user); | |
1672 | } | |
1673 | } | |
1674 | ||
5d3de7df VCG |
1675 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1676 | { | |
1677 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1678 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1679 | |
1680 | if (!conn) | |
1681 | return; | |
1682 | ||
1683 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1684 | ||
1685 | kfree_skb(conn->rx_skb); | |
1686 | ||
61a939c6 | 1687 | skb_queue_purge(&conn->pending_rx); |
7ab56c3a JT |
1688 | |
1689 | /* We can not call flush_work(&conn->pending_rx_work) here since we | |
1690 | * might block if we are running on a worker from the same workqueue | |
1691 | * pending_rx_work is waiting on. | |
1692 | */ | |
1693 | if (work_pending(&conn->pending_rx_work)) | |
1694 | cancel_work_sync(&conn->pending_rx_work); | |
61a939c6 | 1695 | |
2c8e1411 DH |
1696 | l2cap_unregister_all_users(conn); |
1697 | ||
3df91ea2 AE |
1698 | mutex_lock(&conn->chan_lock); |
1699 | ||
5d3de7df VCG |
1700 | /* Kill channels */ |
1701 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1702 | l2cap_chan_hold(chan); |
6be36555 AE |
1703 | l2cap_chan_lock(chan); |
1704 | ||
5d3de7df | 1705 | l2cap_chan_del(chan, err); |
6be36555 AE |
1706 | |
1707 | l2cap_chan_unlock(chan); | |
1708 | ||
80b98027 | 1709 | chan->ops->close(chan); |
61d6ef3e | 1710 | l2cap_chan_put(chan); |
5d3de7df VCG |
1711 | } |
1712 | ||
3df91ea2 AE |
1713 | mutex_unlock(&conn->chan_lock); |
1714 | ||
73d80deb LAD |
1715 | hci_chan_del(conn->hchan); |
1716 | ||
5d3de7df | 1717 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1718 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1719 | |
51a8efd7 | 1720 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1721 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1722 | smp_chan_destroy(conn); |
d26a2345 | 1723 | } |
5d3de7df VCG |
1724 | |
1725 | hcon->l2cap_data = NULL; | |
9c903e37 DH |
1726 | conn->hchan = NULL; |
1727 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1728 | } |
1729 | ||
6c9d42a1 | 1730 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1731 | { |
6c9d42a1 | 1732 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1733 | security_timer.work); |
5d3de7df | 1734 | |
d06cc416 JH |
1735 | BT_DBG("conn %p", conn); |
1736 | ||
1737 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1738 | smp_chan_destroy(conn); | |
1739 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1740 | } | |
5d3de7df VCG |
1741 | } |
1742 | ||
9c903e37 DH |
1743 | static void l2cap_conn_free(struct kref *ref) |
1744 | { | |
1745 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1746 | ||
1747 | hci_conn_put(conn->hcon); | |
1748 | kfree(conn); | |
1749 | } | |
1750 | ||
1751 | void l2cap_conn_get(struct l2cap_conn *conn) | |
1752 | { | |
1753 | kref_get(&conn->ref); | |
1754 | } | |
1755 | EXPORT_SYMBOL(l2cap_conn_get); | |
1756 | ||
1757 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1758 | { | |
1759 | kref_put(&conn->ref, l2cap_conn_free); | |
1760 | } | |
1761 | EXPORT_SYMBOL(l2cap_conn_put); | |
1762 | ||
1da177e4 | 1763 | /* ---- Socket interface ---- */ |
1da177e4 | 1764 | |
c2287681 | 1765 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1766 | * Returns closest match. |
1767 | */ | |
c2287681 IY |
1768 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1769 | bdaddr_t *src, | |
bf20fd4e JH |
1770 | bdaddr_t *dst, |
1771 | u8 link_type) | |
1da177e4 | 1772 | { |
23691d75 | 1773 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1774 | |
23691d75 | 1775 | read_lock(&chan_list_lock); |
e0f0cb56 | 1776 | |
23691d75 | 1777 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1778 | if (state && c->state != state) |
1da177e4 LT |
1779 | continue; |
1780 | ||
bf20fd4e JH |
1781 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1782 | continue; | |
1783 | ||
1784 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
1785 | continue; | |
1786 | ||
23691d75 | 1787 | if (c->psm == psm) { |
c2287681 IY |
1788 | int src_match, dst_match; |
1789 | int src_any, dst_any; | |
1790 | ||
1da177e4 | 1791 | /* Exact match. */ |
7eafc59e MH |
1792 | src_match = !bacmp(&c->src, src); |
1793 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1794 | if (src_match && dst_match) { |
a7567b20 | 1795 | read_unlock(&chan_list_lock); |
23691d75 GP |
1796 | return c; |
1797 | } | |
1da177e4 LT |
1798 | |
1799 | /* Closest match */ | |
7eafc59e MH |
1800 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1801 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1802 | if ((src_match && dst_any) || (src_any && dst_match) || |
1803 | (src_any && dst_any)) | |
23691d75 | 1804 | c1 = c; |
1da177e4 LT |
1805 | } |
1806 | } | |
1da177e4 | 1807 | |
23691d75 | 1808 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1809 | |
23691d75 | 1810 | return c1; |
1da177e4 LT |
1811 | } |
1812 | ||
721c4181 | 1813 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1814 | { |
721c4181 | 1815 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1816 | monitor_timer.work); |
e90bac06 | 1817 | |
525cd185 | 1818 | BT_DBG("chan %p", chan); |
0e98958d | 1819 | |
6be36555 AE |
1820 | l2cap_chan_lock(chan); |
1821 | ||
80909e04 | 1822 | if (!chan->conn) { |
6be36555 | 1823 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1824 | l2cap_chan_put(chan); |
e90bac06 GP |
1825 | return; |
1826 | } | |
1827 | ||
401bb1f7 | 1828 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1829 | |
6be36555 | 1830 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1831 | l2cap_chan_put(chan); |
e90bac06 GP |
1832 | } |
1833 | ||
721c4181 | 1834 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1835 | { |
721c4181 | 1836 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1837 | retrans_timer.work); |
e90bac06 | 1838 | |
49208c9c | 1839 | BT_DBG("chan %p", chan); |
0e98958d | 1840 | |
6be36555 AE |
1841 | l2cap_chan_lock(chan); |
1842 | ||
80909e04 MM |
1843 | if (!chan->conn) { |
1844 | l2cap_chan_unlock(chan); | |
1845 | l2cap_chan_put(chan); | |
1846 | return; | |
1847 | } | |
6be36555 | 1848 | |
401bb1f7 | 1849 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1850 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1851 | l2cap_chan_put(chan); |
e90bac06 GP |
1852 | } |
1853 | ||
d660366d GP |
1854 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1855 | struct sk_buff_head *skbs) | |
6840ed07 | 1856 | { |
ccbb84af | 1857 | struct sk_buff *skb; |
3733937d | 1858 | struct l2cap_ctrl *control; |
6840ed07 | 1859 | |
3733937d MM |
1860 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1861 | ||
b99e13ad MM |
1862 | if (__chan_is_moving(chan)) |
1863 | return; | |
1864 | ||
3733937d MM |
1865 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1866 | ||
1867 | while (!skb_queue_empty(&chan->tx_q)) { | |
1868 | ||
1869 | skb = skb_dequeue(&chan->tx_q); | |
1870 | ||
1871 | bt_cb(skb)->control.retries = 1; | |
1872 | control = &bt_cb(skb)->control; | |
1873 | ||
1874 | control->reqseq = 0; | |
1875 | control->txseq = chan->next_tx_seq; | |
1876 | ||
1877 | __pack_control(chan, control, skb); | |
6840ed07 | 1878 | |
47d1ec61 | 1879 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1880 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1881 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1882 | } |
1883 | ||
4343478f | 1884 | l2cap_do_send(chan, skb); |
6840ed07 | 1885 | |
b4400672 | 1886 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1887 | |
836be934 | 1888 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1889 | chan->frames_sent++; |
6840ed07 | 1890 | } |
6840ed07 GP |
1891 | } |
1892 | ||
67c9e840 | 1893 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1894 | { |
1895 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1896 | struct l2cap_ctrl *control; |
1897 | int sent = 0; | |
1898 | ||
1899 | BT_DBG("chan %p", chan); | |
1c2acffb | 1900 | |
89bc500e | 1901 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1902 | return -ENOTCONN; |
e90bac06 | 1903 | |
94122bbe MM |
1904 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1905 | return 0; | |
1906 | ||
b99e13ad MM |
1907 | if (__chan_is_moving(chan)) |
1908 | return 0; | |
1909 | ||
18a48e76 MM |
1910 | while (chan->tx_send_head && |
1911 | chan->unacked_frames < chan->remote_tx_win && | |
1912 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1913 | |
18a48e76 | 1914 | skb = chan->tx_send_head; |
e90bac06 | 1915 | |
18a48e76 MM |
1916 | bt_cb(skb)->control.retries = 1; |
1917 | control = &bt_cb(skb)->control; | |
95ffa978 | 1918 | |
e2ab4353 | 1919 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1920 | control->final = 1; |
e2ab4353 | 1921 | |
18a48e76 MM |
1922 | control->reqseq = chan->buffer_seq; |
1923 | chan->last_acked_seq = chan->buffer_seq; | |
1924 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1925 | |
18a48e76 | 1926 | __pack_control(chan, control, skb); |
e90bac06 | 1927 | |
47d1ec61 | 1928 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1929 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1930 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1931 | } |
1932 | ||
18a48e76 MM |
1933 | /* Clone after data has been modified. Data is assumed to be |
1934 | read-only (for locking purposes) on cloned sk_buffs. | |
1935 | */ | |
1936 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1937 | |
18a48e76 MM |
1938 | if (!tx_skb) |
1939 | break; | |
1c2acffb | 1940 | |
18a48e76 | 1941 | __set_retrans_timer(chan); |
836be934 AE |
1942 | |
1943 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1944 | chan->unacked_frames++; |
6a026610 | 1945 | chan->frames_sent++; |
18a48e76 | 1946 | sent++; |
1c2acffb | 1947 | |
58d35f87 GP |
1948 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1949 | chan->tx_send_head = NULL; | |
1c2acffb | 1950 | else |
58d35f87 | 1951 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1952 | |
1953 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1954 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1955 | } |
1956 | ||
b4400672 AE |
1957 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1958 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1959 | |
1960 | return sent; | |
9e917af1 GP |
1961 | } |
1962 | ||
e1fbd4c1 MM |
1963 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1964 | { | |
1965 | struct l2cap_ctrl control; | |
1966 | struct sk_buff *skb; | |
1967 | struct sk_buff *tx_skb; | |
1968 | u16 seq; | |
1969 | ||
1970 | BT_DBG("chan %p", chan); | |
1971 | ||
1972 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1973 | return; | |
1974 | ||
b99e13ad MM |
1975 | if (__chan_is_moving(chan)) |
1976 | return; | |
1977 | ||
e1fbd4c1 MM |
1978 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
1979 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1980 | ||
1981 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1982 | if (!skb) { | |
1983 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1984 | seq); |
e1fbd4c1 MM |
1985 | continue; |
1986 | } | |
1987 | ||
1988 | bt_cb(skb)->control.retries++; | |
1989 | control = bt_cb(skb)->control; | |
1990 | ||
1991 | if (chan->max_tx != 0 && | |
1992 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1993 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 1994 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
1995 | l2cap_seq_list_clear(&chan->retrans_list); |
1996 | break; | |
1997 | } | |
1998 | ||
1999 | control.reqseq = chan->buffer_seq; | |
2000 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
2001 | control.final = 1; | |
2002 | else | |
2003 | control.final = 0; | |
2004 | ||
2005 | if (skb_cloned(skb)) { | |
2006 | /* Cloned sk_buffs are read-only, so we need a | |
2007 | * writeable copy | |
2008 | */ | |
8bcde1f2 | 2009 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 2010 | } else { |
8bcde1f2 | 2011 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
2012 | } |
2013 | ||
2014 | if (!tx_skb) { | |
2015 | l2cap_seq_list_clear(&chan->retrans_list); | |
2016 | break; | |
2017 | } | |
2018 | ||
2019 | /* Update skb contents */ | |
2020 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
2021 | put_unaligned_le32(__pack_extended_control(&control), | |
2022 | tx_skb->data + L2CAP_HDR_SIZE); | |
2023 | } else { | |
2024 | put_unaligned_le16(__pack_enhanced_control(&control), | |
2025 | tx_skb->data + L2CAP_HDR_SIZE); | |
2026 | } | |
2027 | ||
2028 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
2029 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
2030 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
2031 | L2CAP_FCS_SIZE)); | |
2032 | } | |
2033 | ||
2034 | l2cap_do_send(chan, tx_skb); | |
2035 | ||
2036 | BT_DBG("Resent txseq %d", control.txseq); | |
2037 | ||
2038 | chan->last_acked_seq = chan->buffer_seq; | |
2039 | } | |
2040 | } | |
2041 | ||
f80842a8 MM |
2042 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2043 | struct l2cap_ctrl *control) | |
2044 | { | |
2045 | BT_DBG("chan %p, control %p", chan, control); | |
2046 | ||
2047 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2048 | l2cap_ertm_resend(chan); | |
2049 | } | |
2050 | ||
d2a7ac5d MM |
2051 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2052 | struct l2cap_ctrl *control) | |
2053 | { | |
e1fbd4c1 MM |
2054 | struct sk_buff *skb; |
2055 | ||
2056 | BT_DBG("chan %p, control %p", chan, control); | |
2057 | ||
2058 | if (control->poll) | |
2059 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2060 | ||
2061 | l2cap_seq_list_clear(&chan->retrans_list); | |
2062 | ||
2063 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2064 | return; | |
2065 | ||
2066 | if (chan->unacked_frames) { | |
2067 | skb_queue_walk(&chan->tx_q, skb) { | |
2068 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2069 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2070 | break; |
2071 | } | |
2072 | ||
2073 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2074 | if (skb == chan->tx_send_head) | |
2075 | break; | |
2076 | ||
2077 | l2cap_seq_list_append(&chan->retrans_list, | |
2078 | bt_cb(skb)->control.txseq); | |
2079 | } | |
2080 | ||
2081 | l2cap_ertm_resend(chan); | |
2082 | } | |
d2a7ac5d MM |
2083 | } |
2084 | ||
0a0aba42 | 2085 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2086 | { |
0a0aba42 MM |
2087 | struct l2cap_ctrl control; |
2088 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2089 | chan->last_acked_seq); | |
2090 | int threshold; | |
9e917af1 | 2091 | |
0a0aba42 MM |
2092 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2093 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2094 | |
0a0aba42 MM |
2095 | memset(&control, 0, sizeof(control)); |
2096 | control.sframe = 1; | |
dfc909be | 2097 | |
0a0aba42 MM |
2098 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2099 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2100 | __clear_ack_timer(chan); | |
2101 | control.super = L2CAP_SUPER_RNR; | |
2102 | control.reqseq = chan->buffer_seq; | |
2103 | l2cap_send_sframe(chan, &control); | |
2104 | } else { | |
2105 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2106 | l2cap_ertm_send(chan); | |
2107 | /* If any i-frames were sent, they included an ack */ | |
2108 | if (chan->buffer_seq == chan->last_acked_seq) | |
2109 | frames_to_ack = 0; | |
2110 | } | |
dfc909be | 2111 | |
c20f8e35 | 2112 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2113 | * Calculate without mul or div |
2114 | */ | |
c20f8e35 | 2115 | threshold = chan->ack_win; |
0a0aba42 MM |
2116 | threshold += threshold << 1; |
2117 | threshold >>= 2; | |
2118 | ||
b4400672 | 2119 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2120 | threshold); |
2121 | ||
2122 | if (frames_to_ack >= threshold) { | |
2123 | __clear_ack_timer(chan); | |
2124 | control.super = L2CAP_SUPER_RR; | |
2125 | control.reqseq = chan->buffer_seq; | |
2126 | l2cap_send_sframe(chan, &control); | |
2127 | frames_to_ack = 0; | |
2128 | } | |
1c2acffb | 2129 | |
0a0aba42 MM |
2130 | if (frames_to_ack) |
2131 | __set_ack_timer(chan); | |
2132 | } | |
b17e73bb SJ |
2133 | } |
2134 | ||
04124681 GP |
2135 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2136 | struct msghdr *msg, int len, | |
2137 | int count, struct sk_buff *skb) | |
1c2acffb | 2138 | { |
0952a57a | 2139 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2140 | struct sk_buff **frag; |
90338947 | 2141 | int sent = 0; |
1da177e4 | 2142 | |
0498878b JR |
2143 | if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count), |
2144 | msg->msg_iov, count)) | |
1c2acffb | 2145 | return -EFAULT; |
1da177e4 LT |
2146 | |
2147 | sent += count; | |
2148 | len -= count; | |
2149 | ||
2150 | /* Continuation fragments (no L2CAP header) */ | |
2151 | frag = &skb_shinfo(skb)->frag_list; | |
2152 | while (len) { | |
fbe00700 GP |
2153 | struct sk_buff *tmp; |
2154 | ||
1da177e4 LT |
2155 | count = min_t(unsigned int, conn->mtu, len); |
2156 | ||
d9fbd02b | 2157 | tmp = chan->ops->alloc_skb(chan, 0, count, |
fbe00700 GP |
2158 | msg->msg_flags & MSG_DONTWAIT); |
2159 | if (IS_ERR(tmp)) | |
2160 | return PTR_ERR(tmp); | |
2161 | ||
2162 | *frag = tmp; | |
2f7719ce | 2163 | |
0498878b JR |
2164 | if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count), |
2165 | msg->msg_iov, count)) | |
1c2acffb | 2166 | return -EFAULT; |
1da177e4 LT |
2167 | |
2168 | sent += count; | |
2169 | len -= count; | |
2170 | ||
2d0ed3d5 GP |
2171 | skb->len += (*frag)->len; |
2172 | skb->data_len += (*frag)->len; | |
2173 | ||
1da177e4 LT |
2174 | frag = &(*frag)->next; |
2175 | } | |
1da177e4 LT |
2176 | |
2177 | return sent; | |
1c2acffb | 2178 | } |
1da177e4 | 2179 | |
5e59b791 | 2180 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
8d46321c | 2181 | struct msghdr *msg, size_t len) |
1c2acffb | 2182 | { |
8c1d787b | 2183 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2184 | struct sk_buff *skb; |
03a51213 | 2185 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2186 | struct l2cap_hdr *lh; |
2187 | ||
8d46321c MH |
2188 | BT_DBG("chan %p psm 0x%2.2x len %zu", chan, |
2189 | __le16_to_cpu(chan->psm), len); | |
1c2acffb GP |
2190 | |
2191 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce | 2192 | |
d9fbd02b | 2193 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2194 | msg->msg_flags & MSG_DONTWAIT); |
2195 | if (IS_ERR(skb)) | |
2196 | return skb; | |
1c2acffb GP |
2197 | |
2198 | /* Create L2CAP header */ | |
2199 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2200 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2201 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2202 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2203 | |
0952a57a | 2204 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2205 | if (unlikely(err < 0)) { |
2206 | kfree_skb(skb); | |
2207 | return ERR_PTR(err); | |
2208 | } | |
2209 | return skb; | |
2210 | } | |
2211 | ||
5e59b791 | 2212 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
8d46321c | 2213 | struct msghdr *msg, size_t len) |
1c2acffb | 2214 | { |
8c1d787b | 2215 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2216 | struct sk_buff *skb; |
f2ba7fae | 2217 | int err, count; |
1c2acffb GP |
2218 | struct l2cap_hdr *lh; |
2219 | ||
b4400672 | 2220 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2221 | |
f2ba7fae | 2222 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2223 | |
d9fbd02b | 2224 | skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, |
90338947 GP |
2225 | msg->msg_flags & MSG_DONTWAIT); |
2226 | if (IS_ERR(skb)) | |
2227 | return skb; | |
1c2acffb GP |
2228 | |
2229 | /* Create L2CAP header */ | |
2230 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2231 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2232 | lh->len = cpu_to_le16(len); |
1c2acffb | 2233 | |
0952a57a | 2234 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2235 | if (unlikely(err < 0)) { |
2236 | kfree_skb(skb); | |
2237 | return ERR_PTR(err); | |
2238 | } | |
2239 | return skb; | |
2240 | } | |
2241 | ||
ab0ff76d | 2242 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2243 | struct msghdr *msg, size_t len, |
2244 | u16 sdulen) | |
1c2acffb | 2245 | { |
8c1d787b | 2246 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2247 | struct sk_buff *skb; |
e4ca6d98 | 2248 | int err, count, hlen; |
1c2acffb GP |
2249 | struct l2cap_hdr *lh; |
2250 | ||
b4400672 | 2251 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2252 | |
0ee0d208 GP |
2253 | if (!conn) |
2254 | return ERR_PTR(-ENOTCONN); | |
2255 | ||
ba7aa64f | 2256 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2257 | |
c74e560c | 2258 | if (sdulen) |
03a51213 | 2259 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2260 | |
47d1ec61 | 2261 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2262 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2263 | |
1c2acffb | 2264 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce | 2265 | |
d9fbd02b | 2266 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2267 | msg->msg_flags & MSG_DONTWAIT); |
2268 | if (IS_ERR(skb)) | |
2269 | return skb; | |
1c2acffb GP |
2270 | |
2271 | /* Create L2CAP header */ | |
2272 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2273 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2274 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2275 | |
18a48e76 MM |
2276 | /* Control header is populated later */ |
2277 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2278 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2279 | else | |
2280 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2281 | |
c74e560c | 2282 | if (sdulen) |
03a51213 | 2283 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2284 | |
0952a57a | 2285 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2286 | if (unlikely(err < 0)) { |
2287 | kfree_skb(skb); | |
2288 | return ERR_PTR(err); | |
2289 | } | |
e90bac06 | 2290 | |
18a48e76 | 2291 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2292 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2293 | return skb; |
1da177e4 LT |
2294 | } |
2295 | ||
94122bbe MM |
2296 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2297 | struct sk_buff_head *seg_queue, | |
2298 | struct msghdr *msg, size_t len) | |
c74e560c | 2299 | { |
c74e560c | 2300 | struct sk_buff *skb; |
94122bbe MM |
2301 | u16 sdu_len; |
2302 | size_t pdu_len; | |
94122bbe | 2303 | u8 sar; |
c74e560c | 2304 | |
b4400672 | 2305 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2306 | |
94122bbe MM |
2307 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2308 | * so fragmented skbs are not used. The HCI layer's handling | |
2309 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2310 | */ | |
c74e560c | 2311 | |
94122bbe MM |
2312 | /* PDU size is derived from the HCI MTU */ |
2313 | pdu_len = chan->conn->mtu; | |
c74e560c | 2314 | |
a549574d MM |
2315 | /* Constrain PDU size for BR/EDR connections */ |
2316 | if (!chan->hs_hcon) | |
2317 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2318 | |
2319 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2320 | if (chan->fcs) |
2321 | pdu_len -= L2CAP_FCS_SIZE; | |
2322 | ||
ba7aa64f | 2323 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2324 | |
2325 | /* Remote device may have requested smaller PDUs */ | |
2326 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2327 | ||
2328 | if (len <= pdu_len) { | |
2329 | sar = L2CAP_SAR_UNSEGMENTED; | |
2330 | sdu_len = 0; | |
2331 | pdu_len = len; | |
2332 | } else { | |
2333 | sar = L2CAP_SAR_START; | |
2334 | sdu_len = len; | |
2335 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2336 | } | |
2337 | ||
2338 | while (len > 0) { | |
2339 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2340 | |
c74e560c | 2341 | if (IS_ERR(skb)) { |
94122bbe | 2342 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2343 | return PTR_ERR(skb); |
2344 | } | |
2345 | ||
94122bbe MM |
2346 | bt_cb(skb)->control.sar = sar; |
2347 | __skb_queue_tail(seg_queue, skb); | |
2348 | ||
2349 | len -= pdu_len; | |
2350 | if (sdu_len) { | |
2351 | sdu_len = 0; | |
2352 | pdu_len += L2CAP_SDULEN_SIZE; | |
2353 | } | |
2354 | ||
2355 | if (len <= pdu_len) { | |
2356 | sar = L2CAP_SAR_END; | |
2357 | pdu_len = len; | |
2358 | } else { | |
2359 | sar = L2CAP_SAR_CONTINUE; | |
2360 | } | |
c74e560c | 2361 | } |
c74e560c | 2362 | |
f0f62799 | 2363 | return 0; |
c74e560c GP |
2364 | } |
2365 | ||
177f8f2b JH |
2366 | static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, |
2367 | struct msghdr *msg, | |
2368 | size_t len, u16 sdulen) | |
2369 | { | |
2370 | struct l2cap_conn *conn = chan->conn; | |
2371 | struct sk_buff *skb; | |
2372 | int err, count, hlen; | |
2373 | struct l2cap_hdr *lh; | |
2374 | ||
2375 | BT_DBG("chan %p len %zu", chan, len); | |
2376 | ||
2377 | if (!conn) | |
2378 | return ERR_PTR(-ENOTCONN); | |
2379 | ||
2380 | hlen = L2CAP_HDR_SIZE; | |
2381 | ||
2382 | if (sdulen) | |
2383 | hlen += L2CAP_SDULEN_SIZE; | |
2384 | ||
2385 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2386 | ||
d9fbd02b | 2387 | skb = chan->ops->alloc_skb(chan, hlen, count, |
177f8f2b JH |
2388 | msg->msg_flags & MSG_DONTWAIT); |
2389 | if (IS_ERR(skb)) | |
2390 | return skb; | |
2391 | ||
2392 | /* Create L2CAP header */ | |
2393 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
2394 | lh->cid = cpu_to_le16(chan->dcid); | |
2395 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
2396 | ||
2397 | if (sdulen) | |
2398 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); | |
2399 | ||
2400 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); | |
2401 | if (unlikely(err < 0)) { | |
2402 | kfree_skb(skb); | |
2403 | return ERR_PTR(err); | |
2404 | } | |
2405 | ||
2406 | return skb; | |
2407 | } | |
2408 | ||
2409 | static int l2cap_segment_le_sdu(struct l2cap_chan *chan, | |
2410 | struct sk_buff_head *seg_queue, | |
2411 | struct msghdr *msg, size_t len) | |
2412 | { | |
2413 | struct sk_buff *skb; | |
2414 | size_t pdu_len; | |
2415 | u16 sdu_len; | |
2416 | ||
2417 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); | |
2418 | ||
2419 | pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE; | |
2420 | ||
2421 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2422 | ||
2423 | sdu_len = len; | |
2424 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2425 | ||
2426 | while (len > 0) { | |
2427 | if (len <= pdu_len) | |
2428 | pdu_len = len; | |
2429 | ||
2430 | skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); | |
2431 | if (IS_ERR(skb)) { | |
2432 | __skb_queue_purge(seg_queue); | |
2433 | return PTR_ERR(skb); | |
2434 | } | |
2435 | ||
2436 | __skb_queue_tail(seg_queue, skb); | |
2437 | ||
2438 | len -= pdu_len; | |
2439 | ||
2440 | if (sdu_len) { | |
2441 | sdu_len = 0; | |
2442 | pdu_len += L2CAP_SDULEN_SIZE; | |
2443 | } | |
2444 | } | |
2445 | ||
2446 | return 0; | |
2447 | } | |
2448 | ||
8d46321c | 2449 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
9a91a04a | 2450 | { |
9a91a04a | 2451 | struct sk_buff *skb; |
9a91a04a | 2452 | int err; |
94122bbe | 2453 | struct sk_buff_head seg_queue; |
9a91a04a | 2454 | |
31e8ce80 SWK |
2455 | if (!chan->conn) |
2456 | return -ENOTCONN; | |
2457 | ||
9a91a04a | 2458 | /* Connectionless channel */ |
715ec005 | 2459 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
8d46321c | 2460 | skb = l2cap_create_connless_pdu(chan, msg, len); |
9a91a04a GP |
2461 | if (IS_ERR(skb)) |
2462 | return PTR_ERR(skb); | |
2463 | ||
ede81a2a AK |
2464 | /* Channel lock is released before requesting new skb and then |
2465 | * reacquired thus we need to recheck channel state. | |
2466 | */ | |
2467 | if (chan->state != BT_CONNECTED) { | |
2468 | kfree_skb(skb); | |
2469 | return -ENOTCONN; | |
2470 | } | |
2471 | ||
9a91a04a GP |
2472 | l2cap_do_send(chan, skb); |
2473 | return len; | |
2474 | } | |
2475 | ||
2476 | switch (chan->mode) { | |
38319713 | 2477 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b JH |
2478 | /* Check outgoing MTU */ |
2479 | if (len > chan->omtu) | |
2480 | return -EMSGSIZE; | |
2481 | ||
fad5fc89 JH |
2482 | if (!chan->tx_credits) |
2483 | return -EAGAIN; | |
2484 | ||
177f8f2b JH |
2485 | __skb_queue_head_init(&seg_queue); |
2486 | ||
2487 | err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); | |
2488 | ||
2489 | if (chan->state != BT_CONNECTED) { | |
2490 | __skb_queue_purge(&seg_queue); | |
2491 | err = -ENOTCONN; | |
2492 | } | |
2493 | ||
2494 | if (err) | |
2495 | return err; | |
2496 | ||
2497 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); | |
2498 | ||
2499 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
2500 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
2501 | chan->tx_credits--; | |
2502 | } | |
2503 | ||
2504 | if (!chan->tx_credits) | |
2505 | chan->ops->suspend(chan); | |
2506 | ||
2507 | err = len; | |
2508 | ||
2509 | break; | |
2510 | ||
fad5fc89 | 2511 | case L2CAP_MODE_BASIC: |
9a91a04a GP |
2512 | /* Check outgoing MTU */ |
2513 | if (len > chan->omtu) | |
2514 | return -EMSGSIZE; | |
2515 | ||
2516 | /* Create a basic PDU */ | |
8d46321c | 2517 | skb = l2cap_create_basic_pdu(chan, msg, len); |
9a91a04a GP |
2518 | if (IS_ERR(skb)) |
2519 | return PTR_ERR(skb); | |
2520 | ||
ede81a2a AK |
2521 | /* Channel lock is released before requesting new skb and then |
2522 | * reacquired thus we need to recheck channel state. | |
2523 | */ | |
2524 | if (chan->state != BT_CONNECTED) { | |
2525 | kfree_skb(skb); | |
2526 | return -ENOTCONN; | |
2527 | } | |
2528 | ||
9a91a04a GP |
2529 | l2cap_do_send(chan, skb); |
2530 | err = len; | |
2531 | break; | |
2532 | ||
2533 | case L2CAP_MODE_ERTM: | |
2534 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2535 | /* Check outgoing MTU */ |
2536 | if (len > chan->omtu) { | |
2537 | err = -EMSGSIZE; | |
2538 | break; | |
2539 | } | |
9a91a04a | 2540 | |
94122bbe | 2541 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2542 | |
94122bbe MM |
2543 | /* Do segmentation before calling in to the state machine, |
2544 | * since it's possible to block while waiting for memory | |
2545 | * allocation. | |
2546 | */ | |
2547 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2548 | |
94122bbe MM |
2549 | /* The channel could have been closed while segmenting, |
2550 | * check that it is still connected. | |
2551 | */ | |
2552 | if (chan->state != BT_CONNECTED) { | |
2553 | __skb_queue_purge(&seg_queue); | |
2554 | err = -ENOTCONN; | |
9a91a04a GP |
2555 | } |
2556 | ||
94122bbe | 2557 | if (err) |
9a91a04a | 2558 | break; |
9a91a04a | 2559 | |
3733937d | 2560 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2561 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2562 | else |
d660366d | 2563 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2564 | |
d660366d | 2565 | err = len; |
9a91a04a | 2566 | |
94122bbe MM |
2567 | /* If the skbs were not queued for sending, they'll still be in |
2568 | * seg_queue and need to be purged. | |
2569 | */ | |
2570 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2571 | break; |
2572 | ||
2573 | default: | |
2574 | BT_DBG("bad state %1.1x", chan->mode); | |
2575 | err = -EBADFD; | |
2576 | } | |
2577 | ||
2578 | return err; | |
2579 | } | |
6b8d4a6a | 2580 | EXPORT_SYMBOL_GPL(l2cap_chan_send); |
9a91a04a | 2581 | |
d2a7ac5d MM |
2582 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2583 | { | |
bed68bde MM |
2584 | struct l2cap_ctrl control; |
2585 | u16 seq; | |
2586 | ||
b4400672 | 2587 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2588 | |
2589 | memset(&control, 0, sizeof(control)); | |
2590 | control.sframe = 1; | |
2591 | control.super = L2CAP_SUPER_SREJ; | |
2592 | ||
2593 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2594 | seq = __next_seq(chan, seq)) { | |
2595 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2596 | control.reqseq = seq; | |
2597 | l2cap_send_sframe(chan, &control); | |
2598 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2599 | } | |
2600 | } | |
2601 | ||
2602 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2603 | } |
2604 | ||
2605 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2606 | { | |
bed68bde MM |
2607 | struct l2cap_ctrl control; |
2608 | ||
2609 | BT_DBG("chan %p", chan); | |
2610 | ||
2611 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2612 | return; | |
2613 | ||
2614 | memset(&control, 0, sizeof(control)); | |
2615 | control.sframe = 1; | |
2616 | control.super = L2CAP_SUPER_SREJ; | |
2617 | control.reqseq = chan->srej_list.tail; | |
2618 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2619 | } |
2620 | ||
2621 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2622 | { | |
bed68bde MM |
2623 | struct l2cap_ctrl control; |
2624 | u16 initial_head; | |
2625 | u16 seq; | |
2626 | ||
b4400672 | 2627 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2628 | |
2629 | memset(&control, 0, sizeof(control)); | |
2630 | control.sframe = 1; | |
2631 | control.super = L2CAP_SUPER_SREJ; | |
2632 | ||
2633 | /* Capture initial list head to allow only one pass through the list. */ | |
2634 | initial_head = chan->srej_list.head; | |
2635 | ||
2636 | do { | |
2637 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2638 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2639 | break; | |
2640 | ||
2641 | control.reqseq = seq; | |
2642 | l2cap_send_sframe(chan, &control); | |
2643 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2644 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2645 | } |
2646 | ||
608bcc6d MM |
2647 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2648 | { | |
2649 | struct sk_buff *acked_skb; | |
2650 | u16 ackseq; | |
2651 | ||
b4400672 | 2652 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2653 | |
2654 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2655 | return; | |
2656 | ||
b4400672 | 2657 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2658 | chan->expected_ack_seq, chan->unacked_frames); |
2659 | ||
2660 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2661 | ackseq = __next_seq(chan, ackseq)) { | |
2662 | ||
2663 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2664 | if (acked_skb) { | |
2665 | skb_unlink(acked_skb, &chan->tx_q); | |
2666 | kfree_skb(acked_skb); | |
2667 | chan->unacked_frames--; | |
2668 | } | |
2669 | } | |
2670 | ||
2671 | chan->expected_ack_seq = reqseq; | |
2672 | ||
2673 | if (chan->unacked_frames == 0) | |
2674 | __clear_retrans_timer(chan); | |
2675 | ||
b4400672 | 2676 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2677 | } |
2678 | ||
2679 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2680 | { | |
2681 | BT_DBG("chan %p", chan); | |
2682 | ||
2683 | chan->expected_tx_seq = chan->buffer_seq; | |
2684 | l2cap_seq_list_clear(&chan->srej_list); | |
2685 | skb_queue_purge(&chan->srej_q); | |
2686 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2687 | } | |
2688 | ||
d660366d GP |
2689 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2690 | struct l2cap_ctrl *control, | |
2691 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2692 | { |
608bcc6d MM |
2693 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2694 | event); | |
2695 | ||
2696 | switch (event) { | |
2697 | case L2CAP_EV_DATA_REQUEST: | |
2698 | if (chan->tx_send_head == NULL) | |
2699 | chan->tx_send_head = skb_peek(skbs); | |
2700 | ||
2701 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2702 | l2cap_ertm_send(chan); | |
2703 | break; | |
2704 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2705 | BT_DBG("Enter LOCAL_BUSY"); | |
2706 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2707 | ||
2708 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2709 | /* The SREJ_SENT state must be aborted if we are to | |
2710 | * enter the LOCAL_BUSY state. | |
2711 | */ | |
2712 | l2cap_abort_rx_srej_sent(chan); | |
2713 | } | |
2714 | ||
2715 | l2cap_send_ack(chan); | |
2716 | ||
2717 | break; | |
2718 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2719 | BT_DBG("Exit LOCAL_BUSY"); | |
2720 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2721 | ||
2722 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2723 | struct l2cap_ctrl local_control; | |
2724 | ||
2725 | memset(&local_control, 0, sizeof(local_control)); | |
2726 | local_control.sframe = 1; | |
2727 | local_control.super = L2CAP_SUPER_RR; | |
2728 | local_control.poll = 1; | |
2729 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2730 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2731 | |
2732 | chan->retry_count = 1; | |
2733 | __set_monitor_timer(chan); | |
2734 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2735 | } | |
2736 | break; | |
2737 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2738 | l2cap_process_reqseq(chan, control->reqseq); | |
2739 | break; | |
2740 | case L2CAP_EV_EXPLICIT_POLL: | |
2741 | l2cap_send_rr_or_rnr(chan, 1); | |
2742 | chan->retry_count = 1; | |
2743 | __set_monitor_timer(chan); | |
2744 | __clear_ack_timer(chan); | |
2745 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2746 | break; | |
2747 | case L2CAP_EV_RETRANS_TO: | |
2748 | l2cap_send_rr_or_rnr(chan, 1); | |
2749 | chan->retry_count = 1; | |
2750 | __set_monitor_timer(chan); | |
2751 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2752 | break; | |
2753 | case L2CAP_EV_RECV_FBIT: | |
2754 | /* Nothing to process */ | |
2755 | break; | |
2756 | default: | |
2757 | break; | |
2758 | } | |
608bcc6d MM |
2759 | } |
2760 | ||
d660366d GP |
2761 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2762 | struct l2cap_ctrl *control, | |
2763 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2764 | { |
608bcc6d MM |
2765 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2766 | event); | |
2767 | ||
2768 | switch (event) { | |
2769 | case L2CAP_EV_DATA_REQUEST: | |
2770 | if (chan->tx_send_head == NULL) | |
2771 | chan->tx_send_head = skb_peek(skbs); | |
2772 | /* Queue data, but don't send. */ | |
2773 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2774 | break; | |
2775 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2776 | BT_DBG("Enter LOCAL_BUSY"); | |
2777 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2778 | ||
2779 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2780 | /* The SREJ_SENT state must be aborted if we are to | |
2781 | * enter the LOCAL_BUSY state. | |
2782 | */ | |
2783 | l2cap_abort_rx_srej_sent(chan); | |
2784 | } | |
2785 | ||
2786 | l2cap_send_ack(chan); | |
2787 | ||
2788 | break; | |
2789 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2790 | BT_DBG("Exit LOCAL_BUSY"); | |
2791 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2792 | ||
2793 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2794 | struct l2cap_ctrl local_control; | |
2795 | memset(&local_control, 0, sizeof(local_control)); | |
2796 | local_control.sframe = 1; | |
2797 | local_control.super = L2CAP_SUPER_RR; | |
2798 | local_control.poll = 1; | |
2799 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2800 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2801 | |
2802 | chan->retry_count = 1; | |
2803 | __set_monitor_timer(chan); | |
2804 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2805 | } | |
2806 | break; | |
2807 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2808 | l2cap_process_reqseq(chan, control->reqseq); | |
2809 | ||
2810 | /* Fall through */ | |
2811 | ||
2812 | case L2CAP_EV_RECV_FBIT: | |
2813 | if (control && control->final) { | |
2814 | __clear_monitor_timer(chan); | |
2815 | if (chan->unacked_frames > 0) | |
2816 | __set_retrans_timer(chan); | |
2817 | chan->retry_count = 0; | |
2818 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2819 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2820 | } | |
2821 | break; | |
2822 | case L2CAP_EV_EXPLICIT_POLL: | |
2823 | /* Ignore */ | |
2824 | break; | |
2825 | case L2CAP_EV_MONITOR_TO: | |
2826 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2827 | l2cap_send_rr_or_rnr(chan, 1); | |
2828 | __set_monitor_timer(chan); | |
2829 | chan->retry_count++; | |
2830 | } else { | |
5e4e3972 | 2831 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2832 | } |
2833 | break; | |
2834 | default: | |
2835 | break; | |
2836 | } | |
608bcc6d MM |
2837 | } |
2838 | ||
d660366d GP |
2839 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2840 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2841 | { |
608bcc6d MM |
2842 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2843 | chan, control, skbs, event, chan->tx_state); | |
2844 | ||
2845 | switch (chan->tx_state) { | |
2846 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2847 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2848 | break; |
2849 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2850 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2851 | break; |
2852 | default: | |
2853 | /* Ignore event */ | |
2854 | break; | |
2855 | } | |
608bcc6d MM |
2856 | } |
2857 | ||
4b51dae9 MM |
2858 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2859 | struct l2cap_ctrl *control) | |
2860 | { | |
2861 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2862 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2863 | } |
2864 | ||
f80842a8 MM |
2865 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2866 | struct l2cap_ctrl *control) | |
2867 | { | |
2868 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2869 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2870 | } |
2871 | ||
1da177e4 LT |
2872 | /* Copy frame to all raw sockets on that connection */ |
2873 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2874 | { | |
1da177e4 | 2875 | struct sk_buff *nskb; |
48454079 | 2876 | struct l2cap_chan *chan; |
1da177e4 LT |
2877 | |
2878 | BT_DBG("conn %p", conn); | |
2879 | ||
3df91ea2 | 2880 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2881 | |
3df91ea2 | 2882 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2883 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2884 | continue; |
2885 | ||
7f5396a7 GP |
2886 | /* Don't send frame to the channel it came from */ |
2887 | if (bt_cb(skb)->chan == chan) | |
1da177e4 | 2888 | continue; |
7f5396a7 | 2889 | |
8bcde1f2 | 2890 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2891 | if (!nskb) |
1da177e4 | 2892 | continue; |
80b98027 | 2893 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2894 | kfree_skb(nskb); |
2895 | } | |
3d57dc68 | 2896 | |
3df91ea2 | 2897 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2898 | } |
2899 | ||
2900 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2901 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2902 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2903 | { |
2904 | struct sk_buff *skb, **frag; | |
2905 | struct l2cap_cmd_hdr *cmd; | |
2906 | struct l2cap_hdr *lh; | |
2907 | int len, count; | |
2908 | ||
b4400672 AE |
2909 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2910 | conn, code, ident, dlen); | |
1da177e4 | 2911 | |
300b962e AL |
2912 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2913 | return NULL; | |
2914 | ||
1da177e4 LT |
2915 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2916 | count = min_t(unsigned int, conn->mtu, len); | |
2917 | ||
8bcde1f2 | 2918 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2919 | if (!skb) |
2920 | return NULL; | |
2921 | ||
2922 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2923 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2924 | |
2925 | if (conn->hcon->type == LE_LINK) | |
dcf4adbf | 2926 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2927 | else |
dcf4adbf | 2928 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2929 | |
2930 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2931 | cmd->code = code; | |
2932 | cmd->ident = ident; | |
aca3192c | 2933 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2934 | |
2935 | if (dlen) { | |
2936 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2937 | memcpy(skb_put(skb, count), data, count); | |
2938 | data += count; | |
2939 | } | |
2940 | ||
2941 | len -= skb->len; | |
2942 | ||
2943 | /* Continuation fragments (no L2CAP header) */ | |
2944 | frag = &skb_shinfo(skb)->frag_list; | |
2945 | while (len) { | |
2946 | count = min_t(unsigned int, conn->mtu, len); | |
2947 | ||
8bcde1f2 | 2948 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2949 | if (!*frag) |
2950 | goto fail; | |
2951 | ||
2952 | memcpy(skb_put(*frag, count), data, count); | |
2953 | ||
2954 | len -= count; | |
2955 | data += count; | |
2956 | ||
2957 | frag = &(*frag)->next; | |
2958 | } | |
2959 | ||
2960 | return skb; | |
2961 | ||
2962 | fail: | |
2963 | kfree_skb(skb); | |
2964 | return NULL; | |
2965 | } | |
2966 | ||
2d792818 GP |
2967 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2968 | unsigned long *val) | |
1da177e4 LT |
2969 | { |
2970 | struct l2cap_conf_opt *opt = *ptr; | |
2971 | int len; | |
2972 | ||
2973 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2974 | *ptr += len; | |
2975 | ||
2976 | *type = opt->type; | |
2977 | *olen = opt->len; | |
2978 | ||
2979 | switch (opt->len) { | |
2980 | case 1: | |
2981 | *val = *((u8 *) opt->val); | |
2982 | break; | |
2983 | ||
2984 | case 2: | |
bfaaeb3e | 2985 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2986 | break; |
2987 | ||
2988 | case 4: | |
bfaaeb3e | 2989 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2990 | break; |
2991 | ||
2992 | default: | |
2993 | *val = (unsigned long) opt->val; | |
2994 | break; | |
2995 | } | |
2996 | ||
b4400672 | 2997 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2998 | return len; |
2999 | } | |
3000 | ||
1da177e4 LT |
3001 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
3002 | { | |
3003 | struct l2cap_conf_opt *opt = *ptr; | |
3004 | ||
b4400672 | 3005 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
3006 | |
3007 | opt->type = type; | |
3008 | opt->len = len; | |
3009 | ||
3010 | switch (len) { | |
3011 | case 1: | |
3012 | *((u8 *) opt->val) = val; | |
3013 | break; | |
3014 | ||
3015 | case 2: | |
4f8b691c | 3016 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
3017 | break; |
3018 | ||
3019 | case 4: | |
4f8b691c | 3020 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
3021 | break; |
3022 | ||
3023 | default: | |
3024 | memcpy(opt->val, (void *) val, len); | |
3025 | break; | |
3026 | } | |
3027 | ||
3028 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
3029 | } | |
3030 | ||
f89cef09 AE |
3031 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
3032 | { | |
3033 | struct l2cap_conf_efs efs; | |
3034 | ||
1ec918ce | 3035 | switch (chan->mode) { |
f89cef09 AE |
3036 | case L2CAP_MODE_ERTM: |
3037 | efs.id = chan->local_id; | |
3038 | efs.stype = chan->local_stype; | |
3039 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3040 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
dcf4adbf JP |
3041 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
3042 | efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
3043 | break; |
3044 | ||
3045 | case L2CAP_MODE_STREAMING: | |
3046 | efs.id = 1; | |
3047 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
3048 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3049 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
3050 | efs.acc_lat = 0; | |
3051 | efs.flush_to = 0; | |
3052 | break; | |
3053 | ||
3054 | default: | |
3055 | return; | |
3056 | } | |
3057 | ||
3058 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 3059 | (unsigned long) &efs); |
f89cef09 AE |
3060 | } |
3061 | ||
721c4181 | 3062 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3063 | { |
721c4181 | 3064 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3065 | ack_timer.work); |
3066 | u16 frames_to_ack; | |
c1b4f43b | 3067 | |
2fb9b3d4 GP |
3068 | BT_DBG("chan %p", chan); |
3069 | ||
6be36555 AE |
3070 | l2cap_chan_lock(chan); |
3071 | ||
0362520b MM |
3072 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3073 | chan->last_acked_seq); | |
6be36555 | 3074 | |
0362520b MM |
3075 | if (frames_to_ack) |
3076 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3077 | |
0362520b | 3078 | l2cap_chan_unlock(chan); |
09bfb2ee | 3079 | l2cap_chan_put(chan); |
c1b4f43b GP |
3080 | } |
3081 | ||
466f8004 | 3082 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3083 | { |
3c588192 MM |
3084 | int err; |
3085 | ||
105bdf9e MM |
3086 | chan->next_tx_seq = 0; |
3087 | chan->expected_tx_seq = 0; | |
42e5c802 | 3088 | chan->expected_ack_seq = 0; |
6a026610 | 3089 | chan->unacked_frames = 0; |
42e5c802 | 3090 | chan->buffer_seq = 0; |
6a026610 | 3091 | chan->frames_sent = 0; |
105bdf9e MM |
3092 | chan->last_acked_seq = 0; |
3093 | chan->sdu = NULL; | |
3094 | chan->sdu_last_frag = NULL; | |
3095 | chan->sdu_len = 0; | |
3096 | ||
d34c34fb MM |
3097 | skb_queue_head_init(&chan->tx_q); |
3098 | ||
6ed971ca MH |
3099 | chan->local_amp_id = AMP_ID_BREDR; |
3100 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3101 | chan->move_state = L2CAP_MOVE_STABLE; |
3102 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3103 | ||
105bdf9e MM |
3104 | if (chan->mode != L2CAP_MODE_ERTM) |
3105 | return 0; | |
3106 | ||
3107 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3108 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3109 | |
721c4181 GP |
3110 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3111 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3112 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3113 | |
f1c6775b | 3114 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3115 | |
3c588192 MM |
3116 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3117 | if (err < 0) | |
3118 | return err; | |
3119 | ||
9dc9affc MM |
3120 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3121 | if (err < 0) | |
3122 | l2cap_seq_list_free(&chan->srej_list); | |
3123 | ||
3124 | return err; | |
0565c1c2 GP |
3125 | } |
3126 | ||
f2fcfcd6 GP |
3127 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3128 | { | |
3129 | switch (mode) { | |
3130 | case L2CAP_MODE_STREAMING: | |
3131 | case L2CAP_MODE_ERTM: | |
3132 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3133 | return mode; | |
3134 | /* fall through */ | |
3135 | default: | |
3136 | return L2CAP_MODE_BASIC; | |
3137 | } | |
3138 | } | |
3139 | ||
848566b3 | 3140 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3141 | { |
848566b3 | 3142 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; |
6327eb98 AE |
3143 | } |
3144 | ||
848566b3 | 3145 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3146 | { |
848566b3 | 3147 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; |
f89cef09 AE |
3148 | } |
3149 | ||
36c86c85 MM |
3150 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3151 | struct l2cap_conf_rfc *rfc) | |
3152 | { | |
6ed971ca | 3153 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3154 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3155 | ||
3156 | /* Class 1 devices have must have ERTM timeouts | |
3157 | * exceeding the Link Supervision Timeout. The | |
3158 | * default Link Supervision Timeout for AMP | |
3159 | * controllers is 10 seconds. | |
3160 | * | |
3161 | * Class 1 devices use 0xffffffff for their | |
3162 | * best-effort flush timeout, so the clamping logic | |
3163 | * will result in a timeout that meets the above | |
3164 | * requirement. ERTM timeouts are 16-bit values, so | |
3165 | * the maximum timeout is 65.535 seconds. | |
3166 | */ | |
3167 | ||
3168 | /* Convert timeout to milliseconds and round */ | |
3169 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3170 | ||
3171 | /* This is the recommended formula for class 2 devices | |
3172 | * that start ERTM timers when packets are sent to the | |
3173 | * controller. | |
3174 | */ | |
3175 | ertm_to = 3 * ertm_to + 500; | |
3176 | ||
3177 | if (ertm_to > 0xffff) | |
3178 | ertm_to = 0xffff; | |
3179 | ||
3180 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3181 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3182 | } else { | |
dcf4adbf JP |
3183 | rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3184 | rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36c86c85 MM |
3185 | } |
3186 | } | |
3187 | ||
6327eb98 AE |
3188 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3189 | { | |
3190 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3191 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3192 | /* use extended control field */ |
3193 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3194 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3195 | } else { | |
6327eb98 | 3196 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3197 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3198 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3199 | } | |
c20f8e35 | 3200 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3201 | } |
3202 | ||
710f9b0a | 3203 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3204 | { |
1da177e4 | 3205 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3206 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3207 | void *ptr = req->data; |
c8f79162 | 3208 | u16 size; |
1da177e4 | 3209 | |
49208c9c | 3210 | BT_DBG("chan %p", chan); |
1da177e4 | 3211 | |
73ffa904 | 3212 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3213 | goto done; |
3214 | ||
0c1bc5c6 | 3215 | switch (chan->mode) { |
f2fcfcd6 GP |
3216 | case L2CAP_MODE_STREAMING: |
3217 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3218 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3219 | break; |
85eb53c6 | 3220 | |
848566b3 | 3221 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3222 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3223 | ||
2ba13ed6 | 3224 | /* fall through */ |
f2fcfcd6 | 3225 | default: |
8c1d787b | 3226 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3227 | break; |
3228 | } | |
3229 | ||
3230 | done: | |
0c1bc5c6 GP |
3231 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3232 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3233 | |
0c1bc5c6 | 3234 | switch (chan->mode) { |
65c7c491 | 3235 | case L2CAP_MODE_BASIC: |
8c1d787b | 3236 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3237 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3238 | break; |
3239 | ||
62547752 GP |
3240 | rfc.mode = L2CAP_MODE_BASIC; |
3241 | rfc.txwin_size = 0; | |
3242 | rfc.max_transmit = 0; | |
3243 | rfc.retrans_timeout = 0; | |
3244 | rfc.monitor_timeout = 0; | |
3245 | rfc.max_pdu_size = 0; | |
3246 | ||
63406504 | 3247 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3248 | (unsigned long) &rfc); |
65c7c491 MH |
3249 | break; |
3250 | ||
3251 | case L2CAP_MODE_ERTM: | |
3252 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3253 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3254 | |
3255 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
c8f79162 AE |
3256 | |
3257 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3258 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3259 | L2CAP_FCS_SIZE); | |
c8f79162 | 3260 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3261 | |
6327eb98 AE |
3262 | l2cap_txwin_setup(chan); |
3263 | ||
3264 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3265 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3266 | |
63406504 | 3267 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3268 | (unsigned long) &rfc); |
63406504 | 3269 | |
f89cef09 AE |
3270 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3271 | l2cap_add_opt_efs(&ptr, chan); | |
3272 | ||
6327eb98 AE |
3273 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3274 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3275 | chan->tx_win); |
60918918 AE |
3276 | |
3277 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3278 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3279 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3280 | chan->fcs = L2CAP_FCS_NONE; |
3281 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3282 | chan->fcs); | |
3283 | } | |
f2fcfcd6 GP |
3284 | break; |
3285 | ||
3286 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3287 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3288 | rfc.mode = L2CAP_MODE_STREAMING; |
3289 | rfc.txwin_size = 0; | |
3290 | rfc.max_transmit = 0; | |
3291 | rfc.retrans_timeout = 0; | |
3292 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3293 | |
3294 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3295 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3296 | L2CAP_FCS_SIZE); | |
c8f79162 | 3297 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3298 | |
63406504 | 3299 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3300 | (unsigned long) &rfc); |
63406504 | 3301 | |
f89cef09 AE |
3302 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3303 | l2cap_add_opt_efs(&ptr, chan); | |
3304 | ||
60918918 AE |
3305 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3306 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3307 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3308 | chan->fcs = L2CAP_FCS_NONE; |
3309 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3310 | chan->fcs); | |
3311 | } | |
65c7c491 MH |
3312 | break; |
3313 | } | |
1da177e4 | 3314 | |
fe4128e0 | 3315 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3316 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
3317 | |
3318 | return ptr - data; | |
3319 | } | |
3320 | ||
73ffa904 | 3321 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3322 | { |
5dee9e7c MH |
3323 | struct l2cap_conf_rsp *rsp = data; |
3324 | void *ptr = rsp->data; | |
73ffa904 GP |
3325 | void *req = chan->conf_req; |
3326 | int len = chan->conf_len; | |
5dee9e7c MH |
3327 | int type, hint, olen; |
3328 | unsigned long val; | |
6464f35f | 3329 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3330 | struct l2cap_conf_efs efs; |
3331 | u8 remote_efs = 0; | |
861d6882 | 3332 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3333 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3334 | u16 size; |
1da177e4 | 3335 | |
73ffa904 | 3336 | BT_DBG("chan %p", chan); |
820ae1b8 | 3337 | |
5dee9e7c MH |
3338 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3339 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3340 | |
589d2746 | 3341 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3342 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3343 | |
3344 | switch (type) { | |
3345 | case L2CAP_CONF_MTU: | |
861d6882 | 3346 | mtu = val; |
5dee9e7c MH |
3347 | break; |
3348 | ||
3349 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3350 | chan->flush_to = val; |
5dee9e7c MH |
3351 | break; |
3352 | ||
3353 | case L2CAP_CONF_QOS: | |
3354 | break; | |
3355 | ||
6464f35f MH |
3356 | case L2CAP_CONF_RFC: |
3357 | if (olen == sizeof(rfc)) | |
3358 | memcpy(&rfc, (void *) val, olen); | |
3359 | break; | |
3360 | ||
fcc203c3 GP |
3361 | case L2CAP_CONF_FCS: |
3362 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3363 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3364 | break; |
fcc203c3 | 3365 | |
42dceae2 AE |
3366 | case L2CAP_CONF_EFS: |
3367 | remote_efs = 1; | |
3368 | if (olen == sizeof(efs)) | |
3369 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3370 | break; |
3371 | ||
6327eb98 | 3372 | case L2CAP_CONF_EWS: |
848566b3 | 3373 | if (!chan->conn->hs_enabled) |
6327eb98 | 3374 | return -ECONNREFUSED; |
fcc203c3 | 3375 | |
6327eb98 AE |
3376 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3377 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3378 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3379 | chan->remote_tx_win = val; |
fcc203c3 GP |
3380 | break; |
3381 | ||
5dee9e7c MH |
3382 | default: |
3383 | if (hint) | |
3384 | break; | |
3385 | ||
3386 | result = L2CAP_CONF_UNKNOWN; | |
3387 | *((u8 *) ptr++) = type; | |
3388 | break; | |
3389 | } | |
3390 | } | |
3391 | ||
73ffa904 | 3392 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3393 | goto done; |
3394 | ||
0c1bc5c6 | 3395 | switch (chan->mode) { |
f2fcfcd6 GP |
3396 | case L2CAP_MODE_STREAMING: |
3397 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3398 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3399 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3400 | chan->conn->feat_mask); |
85eb53c6 GP |
3401 | break; |
3402 | } | |
3403 | ||
42dceae2 | 3404 | if (remote_efs) { |
848566b3 | 3405 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3406 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3407 | else | |
3408 | return -ECONNREFUSED; | |
3409 | } | |
3410 | ||
0c1bc5c6 | 3411 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3412 | return -ECONNREFUSED; |
742e519b | 3413 | |
f2fcfcd6 | 3414 | break; |
f2fcfcd6 GP |
3415 | } |
3416 | ||
3417 | done: | |
0c1bc5c6 | 3418 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3419 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3420 | rfc.mode = chan->mode; |
f2fcfcd6 | 3421 | |
73ffa904 | 3422 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3423 | return -ECONNREFUSED; |
3424 | ||
2d792818 GP |
3425 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3426 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3427 | } |
3428 | ||
5dee9e7c MH |
3429 | if (result == L2CAP_CONF_SUCCESS) { |
3430 | /* Configure output options and let the other side know | |
3431 | * which ones we don't like. */ | |
3432 | ||
f2fcfcd6 GP |
3433 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3434 | result = L2CAP_CONF_UNACCEPT; | |
3435 | else { | |
0c1bc5c6 | 3436 | chan->omtu = mtu; |
c1360a1c | 3437 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3438 | } |
0c1bc5c6 | 3439 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3440 | |
42dceae2 AE |
3441 | if (remote_efs) { |
3442 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3443 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3444 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3445 | |
3446 | result = L2CAP_CONF_UNACCEPT; | |
3447 | ||
3448 | if (chan->num_conf_req >= 1) | |
3449 | return -ECONNREFUSED; | |
3450 | ||
3451 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3452 | sizeof(efs), |
3453 | (unsigned long) &efs); | |
0e8b207e | 3454 | } else { |
3e6b3b95 | 3455 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3456 | result = L2CAP_CONF_PENDING; |
3457 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3458 | } |
3459 | } | |
3460 | ||
f2fcfcd6 GP |
3461 | switch (rfc.mode) { |
3462 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3463 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3464 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3465 | break; |
3466 | ||
3467 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3468 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3469 | chan->remote_tx_win = rfc.txwin_size; | |
3470 | else | |
3471 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3472 | |
2c03a7a4 | 3473 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3474 | |
c8f79162 | 3475 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3476 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3477 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3478 | rfc.max_pdu_size = cpu_to_le16(size); |
3479 | chan->remote_mps = size; | |
f2fcfcd6 | 3480 | |
36c86c85 | 3481 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3482 | |
c1360a1c | 3483 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3484 | |
3485 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3486 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3487 | |
42dceae2 AE |
3488 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3489 | chan->remote_id = efs.id; | |
3490 | chan->remote_stype = efs.stype; | |
3491 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3492 | chan->remote_flush_to = | |
2d792818 | 3493 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3494 | chan->remote_acc_lat = |
2d792818 | 3495 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3496 | chan->remote_sdu_itime = |
3497 | le32_to_cpu(efs.sdu_itime); | |
3498 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3499 | sizeof(efs), |
3500 | (unsigned long) &efs); | |
42dceae2 | 3501 | } |
f2fcfcd6 GP |
3502 | break; |
3503 | ||
3504 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3505 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3506 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3507 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3508 | rfc.max_pdu_size = cpu_to_le16(size); |
3509 | chan->remote_mps = size; | |
f2fcfcd6 | 3510 | |
c1360a1c | 3511 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3512 | |
2d792818 GP |
3513 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3514 | (unsigned long) &rfc); | |
68ae6639 | 3515 | |
f2fcfcd6 GP |
3516 | break; |
3517 | ||
3518 | default: | |
5dee9e7c | 3519 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3520 | |
6464f35f | 3521 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3522 | rfc.mode = chan->mode; |
f2fcfcd6 | 3523 | } |
6464f35f | 3524 | |
f2fcfcd6 | 3525 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3526 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3527 | } |
fe4128e0 | 3528 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3529 | rsp->result = cpu_to_le16(result); |
dcf4adbf | 3530 | rsp->flags = cpu_to_le16(0); |
5dee9e7c MH |
3531 | |
3532 | return ptr - data; | |
1da177e4 LT |
3533 | } |
3534 | ||
2d792818 GP |
3535 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3536 | void *data, u16 *result) | |
f2fcfcd6 | 3537 | { |
f2fcfcd6 GP |
3538 | struct l2cap_conf_req *req = data; |
3539 | void *ptr = req->data; | |
3540 | int type, olen; | |
3541 | unsigned long val; | |
36e999a8 | 3542 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3543 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3544 | |
fe4128e0 | 3545 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3546 | |
3547 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3548 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3549 | ||
3550 | switch (type) { | |
3551 | case L2CAP_CONF_MTU: | |
3552 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3553 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3554 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3555 | } else |
0c1bc5c6 GP |
3556 | chan->imtu = val; |
3557 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3558 | break; |
3559 | ||
3560 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3561 | chan->flush_to = val; |
f2fcfcd6 | 3562 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3563 | 2, chan->flush_to); |
f2fcfcd6 GP |
3564 | break; |
3565 | ||
3566 | case L2CAP_CONF_RFC: | |
3567 | if (olen == sizeof(rfc)) | |
3568 | memcpy(&rfc, (void *)val, olen); | |
3569 | ||
c1360a1c | 3570 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3571 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3572 | return -ECONNREFUSED; |
3573 | ||
47d1ec61 | 3574 | chan->fcs = 0; |
f2fcfcd6 GP |
3575 | |
3576 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3577 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3578 | break; |
6327eb98 AE |
3579 | |
3580 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3581 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3582 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3583 | chan->tx_win); |
6327eb98 | 3584 | break; |
66af7aaf AE |
3585 | |
3586 | case L2CAP_CONF_EFS: | |
3587 | if (olen == sizeof(efs)) | |
3588 | memcpy(&efs, (void *)val, olen); | |
3589 | ||
3590 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3591 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3592 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3593 | return -ECONNREFUSED; |
3594 | ||
2d792818 GP |
3595 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3596 | (unsigned long) &efs); | |
66af7aaf | 3597 | break; |
cbabee78 AE |
3598 | |
3599 | case L2CAP_CONF_FCS: | |
3600 | if (*result == L2CAP_CONF_PENDING) | |
3601 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3602 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3603 | &chan->conf_state); |
3604 | break; | |
f2fcfcd6 GP |
3605 | } |
3606 | } | |
3607 | ||
0c1bc5c6 | 3608 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3609 | return -ECONNREFUSED; |
3610 | ||
0c1bc5c6 | 3611 | chan->mode = rfc.mode; |
6c2ea7a8 | 3612 | |
0e8b207e | 3613 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3614 | switch (rfc.mode) { |
3615 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3616 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3617 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3618 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3619 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3620 | chan->ack_win = min_t(u16, chan->ack_win, | |
3621 | rfc.txwin_size); | |
66af7aaf AE |
3622 | |
3623 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3624 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3625 | chan->local_sdu_itime = | |
2d792818 | 3626 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3627 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3628 | chan->local_flush_to = | |
2d792818 | 3629 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3630 | } |
f2fcfcd6 | 3631 | break; |
66af7aaf | 3632 | |
f2fcfcd6 | 3633 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3634 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3635 | } |
3636 | } | |
3637 | ||
fe4128e0 | 3638 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3639 | req->flags = cpu_to_le16(0); |
f2fcfcd6 GP |
3640 | |
3641 | return ptr - data; | |
3642 | } | |
3643 | ||
2d792818 GP |
3644 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3645 | u16 result, u16 flags) | |
1da177e4 LT |
3646 | { |
3647 | struct l2cap_conf_rsp *rsp = data; | |
3648 | void *ptr = rsp->data; | |
1da177e4 | 3649 | |
fe4128e0 | 3650 | BT_DBG("chan %p", chan); |
1da177e4 | 3651 | |
fe4128e0 | 3652 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3653 | rsp->result = cpu_to_le16(result); |
aca3192c | 3654 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3655 | |
3656 | return ptr - data; | |
3657 | } | |
3658 | ||
27e2d4c8 JH |
3659 | void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) |
3660 | { | |
3661 | struct l2cap_le_conn_rsp rsp; | |
3662 | struct l2cap_conn *conn = chan->conn; | |
3663 | ||
3664 | BT_DBG("chan %p", chan); | |
3665 | ||
3666 | rsp.dcid = cpu_to_le16(chan->scid); | |
3667 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 3668 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 3669 | rsp.credits = cpu_to_le16(chan->rx_credits); |
dcf4adbf | 3670 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
27e2d4c8 JH |
3671 | |
3672 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
3673 | &rsp); | |
3674 | } | |
3675 | ||
8c1d787b | 3676 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3677 | { |
3678 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3679 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3680 | u8 buf[128]; |
439f34ac | 3681 | u8 rsp_code; |
710f9b0a | 3682 | |
fe4128e0 GP |
3683 | rsp.scid = cpu_to_le16(chan->dcid); |
3684 | rsp.dcid = cpu_to_le16(chan->scid); | |
dcf4adbf JP |
3685 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3686 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3687 | |
3688 | if (chan->hs_hcon) | |
3689 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3690 | else | |
3691 | rsp_code = L2CAP_CONN_RSP; | |
3692 | ||
3693 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3694 | ||
3695 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3696 | |
c1360a1c | 3697 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3698 | return; |
3699 | ||
710f9b0a | 3700 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3701 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3702 | chan->num_conf_req++; |
3703 | } | |
3704 | ||
47d1ec61 | 3705 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3706 | { |
7b1c0049 GP |
3707 | int type, olen; |
3708 | unsigned long val; | |
c20f8e35 MM |
3709 | /* Use sane default values in case a misbehaving remote device |
3710 | * did not send an RFC or extended window size option. | |
3711 | */ | |
3712 | u16 txwin_ext = chan->ack_win; | |
3713 | struct l2cap_conf_rfc rfc = { | |
3714 | .mode = chan->mode, | |
dcf4adbf JP |
3715 | .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), |
3716 | .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
c20f8e35 MM |
3717 | .max_pdu_size = cpu_to_le16(chan->imtu), |
3718 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3719 | }; | |
7b1c0049 | 3720 | |
47d1ec61 | 3721 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3722 | |
0c1bc5c6 | 3723 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3724 | return; |
3725 | ||
3726 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3727 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3728 | ||
c20f8e35 MM |
3729 | switch (type) { |
3730 | case L2CAP_CONF_RFC: | |
3731 | if (olen == sizeof(rfc)) | |
3732 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3733 | break; |
c20f8e35 MM |
3734 | case L2CAP_CONF_EWS: |
3735 | txwin_ext = val; | |
3736 | break; | |
3737 | } | |
7b1c0049 GP |
3738 | } |
3739 | ||
7b1c0049 GP |
3740 | switch (rfc.mode) { |
3741 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3742 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3743 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3744 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3745 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3746 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3747 | else | |
3748 | chan->ack_win = min_t(u16, chan->ack_win, | |
3749 | rfc.txwin_size); | |
7b1c0049 GP |
3750 | break; |
3751 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3752 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3753 | } |
3754 | } | |
3755 | ||
2d792818 | 3756 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3757 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3758 | u8 *data) | |
4e8402a3 | 3759 | { |
e2fd318e | 3760 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3761 | |
cb3b3152 JH |
3762 | if (cmd_len < sizeof(*rej)) |
3763 | return -EPROTO; | |
3764 | ||
e2fd318e | 3765 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3766 | return 0; |
3767 | ||
3768 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3769 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3770 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3771 | |
3772 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3773 | conn->info_ident = 0; |
984947dc | 3774 | |
4e8402a3 MH |
3775 | l2cap_conn_start(conn); |
3776 | } | |
3777 | ||
3778 | return 0; | |
3779 | } | |
3780 | ||
1700915f MM |
3781 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3782 | struct l2cap_cmd_hdr *cmd, | |
3783 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3784 | { |
1da177e4 LT |
3785 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3786 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3787 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3788 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3789 | |
3790 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3791 | __le16 psm = req->psm; |
1da177e4 | 3792 | |
097db76c | 3793 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3794 | |
3795 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3796 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
bf20fd4e | 3797 | &conn->hcon->dst, ACL_LINK); |
23691d75 | 3798 | if (!pchan) { |
1da177e4 LT |
3799 | result = L2CAP_CR_BAD_PSM; |
3800 | goto sendresp; | |
3801 | } | |
3802 | ||
3df91ea2 | 3803 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3804 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3805 | |
e7c29cb1 | 3806 | /* Check if the ACL is secure enough (if not SDP) */ |
dcf4adbf | 3807 | if (psm != cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3808 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3809 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3810 | result = L2CAP_CR_SEC_BLOCK; |
3811 | goto response; | |
3812 | } | |
3813 | ||
1da177e4 LT |
3814 | result = L2CAP_CR_NO_MEM; |
3815 | ||
2dfa1003 GP |
3816 | /* Check if we already have channel with that dcid */ |
3817 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3818 | goto response; | |
3819 | ||
80b98027 | 3820 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3821 | if (!chan) |
1da177e4 LT |
3822 | goto response; |
3823 | ||
330b6c15 SS |
3824 | /* For certain devices (ex: HID mouse), support for authentication, |
3825 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3826 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3827 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3828 | */ | |
3829 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3830 | ||
7eafc59e MH |
3831 | bacpy(&chan->src, &conn->hcon->src); |
3832 | bacpy(&chan->dst, &conn->hcon->dst); | |
4f1654e0 MH |
3833 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); |
3834 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
fe4128e0 GP |
3835 | chan->psm = psm; |
3836 | chan->dcid = scid; | |
1700915f | 3837 | chan->local_amp_id = amp_id; |
1da177e4 | 3838 | |
6be36555 | 3839 | __l2cap_chan_add(conn, chan); |
48454079 | 3840 | |
fe4128e0 | 3841 | dcid = chan->scid; |
1da177e4 | 3842 | |
8d836d71 | 3843 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3844 | |
fc7f8a7e | 3845 | chan->ident = cmd->ident; |
1da177e4 | 3846 | |
984947dc | 3847 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3848 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 3849 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3850 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3851 | result = L2CAP_CR_PEND; |
3852 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3853 | chan->ops->defer(chan); |
f66dc81f | 3854 | } else { |
1700915f MM |
3855 | /* Force pending result for AMP controllers. |
3856 | * The connection will succeed after the | |
3857 | * physical link is up. | |
3858 | */ | |
6ed971ca | 3859 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3860 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3861 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3862 | } else { |
f93fa273 | 3863 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3864 | result = L2CAP_CR_PEND; |
1700915f | 3865 | } |
f66dc81f MH |
3866 | status = L2CAP_CS_NO_INFO; |
3867 | } | |
79d554a6 | 3868 | } else { |
f93fa273 | 3869 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3870 | result = L2CAP_CR_PEND; |
3871 | status = L2CAP_CS_AUTHEN_PEND; | |
3872 | } | |
3873 | } else { | |
f93fa273 | 3874 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3875 | result = L2CAP_CR_PEND; |
3876 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3877 | } |
3878 | ||
1da177e4 | 3879 | response: |
8ffb9290 | 3880 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3881 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3882 | |
3883 | sendresp: | |
aca3192c YH |
3884 | rsp.scid = cpu_to_le16(scid); |
3885 | rsp.dcid = cpu_to_le16(dcid); | |
3886 | rsp.result = cpu_to_le16(result); | |
3887 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3888 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3889 | |
3890 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3891 | struct l2cap_info_req info; | |
dcf4adbf | 3892 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3893 | |
3894 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3895 | conn->info_ident = l2cap_get_ident(conn); | |
3896 | ||
ba13ccd9 | 3897 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3898 | |
2d792818 GP |
3899 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3900 | sizeof(info), &info); | |
79d554a6 MH |
3901 | } |
3902 | ||
c1360a1c | 3903 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3904 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3905 | u8 buf[128]; |
c1360a1c | 3906 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3907 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3908 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3909 | chan->num_conf_req++; |
e9aeb2dd | 3910 | } |
1700915f MM |
3911 | |
3912 | return chan; | |
4c89b6aa | 3913 | } |
e9aeb2dd | 3914 | |
4c89b6aa | 3915 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3916 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3917 | { |
7b064eda JK |
3918 | struct hci_dev *hdev = conn->hcon->hdev; |
3919 | struct hci_conn *hcon = conn->hcon; | |
3920 | ||
cb3b3152 JH |
3921 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3922 | return -EPROTO; | |
3923 | ||
7b064eda JK |
3924 | hci_dev_lock(hdev); |
3925 | if (test_bit(HCI_MGMT, &hdev->dev_flags) && | |
3926 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) | |
3927 | mgmt_device_connected(hdev, &hcon->dst, hcon->type, | |
3928 | hcon->dst_type, 0, NULL, 0, | |
3929 | hcon->dev_class); | |
3930 | hci_dev_unlock(hdev); | |
3931 | ||
300229f9 | 3932 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3933 | return 0; |
3934 | } | |
3935 | ||
5909cf30 | 3936 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3937 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3938 | u8 *data) | |
1da177e4 LT |
3939 | { |
3940 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3941 | u16 scid, dcid, result, status; | |
48454079 | 3942 | struct l2cap_chan *chan; |
1da177e4 | 3943 | u8 req[128]; |
3df91ea2 | 3944 | int err; |
1da177e4 | 3945 | |
cb3b3152 JH |
3946 | if (cmd_len < sizeof(*rsp)) |
3947 | return -EPROTO; | |
3948 | ||
1da177e4 LT |
3949 | scid = __le16_to_cpu(rsp->scid); |
3950 | dcid = __le16_to_cpu(rsp->dcid); | |
3951 | result = __le16_to_cpu(rsp->result); | |
3952 | status = __le16_to_cpu(rsp->status); | |
3953 | ||
1b009c98 | 3954 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3955 | dcid, scid, result, status); |
1da177e4 | 3956 | |
3df91ea2 AE |
3957 | mutex_lock(&conn->chan_lock); |
3958 | ||
1da177e4 | 3959 | if (scid) { |
3df91ea2 AE |
3960 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3961 | if (!chan) { | |
21870b52 | 3962 | err = -EBADSLT; |
3df91ea2 AE |
3963 | goto unlock; |
3964 | } | |
1da177e4 | 3965 | } else { |
3df91ea2 AE |
3966 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3967 | if (!chan) { | |
21870b52 | 3968 | err = -EBADSLT; |
3df91ea2 AE |
3969 | goto unlock; |
3970 | } | |
1da177e4 LT |
3971 | } |
3972 | ||
3df91ea2 AE |
3973 | err = 0; |
3974 | ||
6be36555 | 3975 | l2cap_chan_lock(chan); |
48454079 | 3976 | |
1da177e4 LT |
3977 | switch (result) { |
3978 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3979 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3980 | chan->ident = 0; |
fe4128e0 | 3981 | chan->dcid = dcid; |
c1360a1c | 3982 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3983 | |
c1360a1c | 3984 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3985 | break; |
3986 | ||
1da177e4 | 3987 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3988 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3989 | chan->num_conf_req++; |
1da177e4 LT |
3990 | break; |
3991 | ||
3992 | case L2CAP_CR_PEND: | |
c1360a1c | 3993 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3994 | break; |
3995 | ||
3996 | default: | |
48454079 | 3997 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3998 | break; |
3999 | } | |
4000 | ||
6be36555 | 4001 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
4002 | |
4003 | unlock: | |
4004 | mutex_unlock(&conn->chan_lock); | |
4005 | ||
4006 | return err; | |
1da177e4 LT |
4007 | } |
4008 | ||
47d1ec61 | 4009 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
4010 | { |
4011 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
4012 | * sides request it. | |
4013 | */ | |
0c1bc5c6 | 4014 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 4015 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 4016 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 4017 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
4018 | } |
4019 | ||
29d8a590 AE |
4020 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
4021 | u8 ident, u16 flags) | |
4022 | { | |
4023 | struct l2cap_conn *conn = chan->conn; | |
4024 | ||
4025 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
4026 | flags); | |
4027 | ||
4028 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
4029 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
4030 | ||
4031 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
4032 | l2cap_build_conf_rsp(chan, data, | |
4033 | L2CAP_CONF_SUCCESS, flags), data); | |
4034 | } | |
4035 | ||
662d652d JH |
4036 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
4037 | u16 scid, u16 dcid) | |
4038 | { | |
4039 | struct l2cap_cmd_rej_cid rej; | |
4040 | ||
dcf4adbf | 4041 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); |
662d652d JH |
4042 | rej.scid = __cpu_to_le16(scid); |
4043 | rej.dcid = __cpu_to_le16(dcid); | |
4044 | ||
4045 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
4046 | } | |
4047 | ||
2d792818 GP |
4048 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
4049 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
4050 | u8 *data) | |
1da177e4 LT |
4051 | { |
4052 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
4053 | u16 dcid, flags; | |
4054 | u8 rsp[64]; | |
48454079 | 4055 | struct l2cap_chan *chan; |
3c588192 | 4056 | int len, err = 0; |
1da177e4 | 4057 | |
cb3b3152 JH |
4058 | if (cmd_len < sizeof(*req)) |
4059 | return -EPROTO; | |
4060 | ||
1da177e4 LT |
4061 | dcid = __le16_to_cpu(req->dcid); |
4062 | flags = __le16_to_cpu(req->flags); | |
4063 | ||
4064 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
4065 | ||
baa7e1fa | 4066 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
4067 | if (!chan) { |
4068 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
4069 | return 0; | |
4070 | } | |
1da177e4 | 4071 | |
033b1142 | 4072 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
4073 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4074 | chan->dcid); | |
354f60a9 | 4075 | goto unlock; |
df6bd743 | 4076 | } |
354f60a9 | 4077 | |
5dee9e7c | 4078 | /* Reject if config buffer is too small. */ |
88219a0f | 4079 | len = cmd_len - sizeof(*req); |
cb3b3152 | 4080 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4081 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4082 | l2cap_build_conf_rsp(chan, rsp, |
4083 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4084 | goto unlock; |
4085 | } | |
4086 | ||
4087 | /* Store config. */ | |
73ffa904 GP |
4088 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4089 | chan->conf_len += len; | |
1da177e4 | 4090 | |
59e54bd1 | 4091 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4092 | /* Incomplete config. Send empty response. */ |
4093 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4094 | l2cap_build_conf_rsp(chan, rsp, |
4095 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4096 | goto unlock; |
4097 | } | |
4098 | ||
4099 | /* Complete config. */ | |
73ffa904 | 4100 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4101 | if (len < 0) { |
5e4e3972 | 4102 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4103 | goto unlock; |
f2fcfcd6 | 4104 | } |
1da177e4 | 4105 | |
1500109b | 4106 | chan->ident = cmd->ident; |
5dee9e7c | 4107 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4108 | chan->num_conf_rsp++; |
5dee9e7c | 4109 | |
5dee9e7c | 4110 | /* Reset config buffer. */ |
73ffa904 | 4111 | chan->conf_len = 0; |
5dee9e7c | 4112 | |
c1360a1c | 4113 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4114 | goto unlock; |
4115 | ||
c1360a1c | 4116 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4117 | set_default_fcs(chan); |
fcc203c3 | 4118 | |
105bdf9e MM |
4119 | if (chan->mode == L2CAP_MODE_ERTM || |
4120 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4121 | err = l2cap_ertm_init(chan); |
4122 | ||
4123 | if (err < 0) | |
5e4e3972 | 4124 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4125 | else |
4126 | l2cap_chan_ready(chan); | |
0565c1c2 | 4127 | |
876d9484 MH |
4128 | goto unlock; |
4129 | } | |
4130 | ||
c1360a1c | 4131 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4132 | u8 buf[64]; |
1da177e4 | 4133 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4134 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4135 | chan->num_conf_req++; |
1da177e4 LT |
4136 | } |
4137 | ||
0e8b207e AE |
4138 | /* Got Conf Rsp PENDING from remote side and asume we sent |
4139 | Conf Rsp PENDING in the code above */ | |
4140 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4141 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4142 | |
4143 | /* check compatibility */ | |
4144 | ||
79de886d | 4145 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4146 | if (!chan->hs_hcon) |
79de886d AE |
4147 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4148 | else | |
4149 | chan->ident = cmd->ident; | |
0e8b207e AE |
4150 | } |
4151 | ||
1da177e4 | 4152 | unlock: |
6be36555 | 4153 | l2cap_chan_unlock(chan); |
3c588192 | 4154 | return err; |
1da177e4 LT |
4155 | } |
4156 | ||
2d792818 | 4157 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4158 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4159 | u8 *data) | |
1da177e4 LT |
4160 | { |
4161 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4162 | u16 scid, flags, result; | |
48454079 | 4163 | struct l2cap_chan *chan; |
cb3b3152 | 4164 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4165 | int err = 0; |
1da177e4 | 4166 | |
cb3b3152 JH |
4167 | if (cmd_len < sizeof(*rsp)) |
4168 | return -EPROTO; | |
4169 | ||
1da177e4 LT |
4170 | scid = __le16_to_cpu(rsp->scid); |
4171 | flags = __le16_to_cpu(rsp->flags); | |
4172 | result = __le16_to_cpu(rsp->result); | |
4173 | ||
61386cba AE |
4174 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4175 | result, len); | |
1da177e4 | 4176 | |
baa7e1fa | 4177 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4178 | if (!chan) |
1da177e4 LT |
4179 | return 0; |
4180 | ||
4181 | switch (result) { | |
4182 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4183 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4184 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4185 | break; |
4186 | ||
0e8b207e AE |
4187 | case L2CAP_CONF_PENDING: |
4188 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4189 | ||
4190 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4191 | char buf[64]; | |
4192 | ||
4193 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4194 | buf, &result); |
0e8b207e | 4195 | if (len < 0) { |
5e4e3972 | 4196 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4197 | goto done; |
4198 | } | |
4199 | ||
f351bc72 | 4200 | if (!chan->hs_hcon) { |
79de886d AE |
4201 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4202 | 0); | |
5ce66b59 AE |
4203 | } else { |
4204 | if (l2cap_check_efs(chan)) { | |
4205 | amp_create_logical_link(chan); | |
4206 | chan->ident = cmd->ident; | |
4207 | } | |
4208 | } | |
0e8b207e AE |
4209 | } |
4210 | goto done; | |
4211 | ||
1da177e4 | 4212 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4213 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4214 | char req[64]; |
4215 | ||
c2c77ec8 | 4216 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4217 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4218 | goto done; |
4219 | } | |
4220 | ||
f2fcfcd6 GP |
4221 | /* throw out any old stored conf requests */ |
4222 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4223 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4224 | req, &result); |
f2fcfcd6 | 4225 | if (len < 0) { |
5e4e3972 | 4226 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4227 | goto done; |
4228 | } | |
4229 | ||
4230 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4231 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4232 | chan->num_conf_req++; |
f2fcfcd6 GP |
4233 | if (result != L2CAP_CONF_SUCCESS) |
4234 | goto done; | |
4235 | break; | |
1da177e4 LT |
4236 | } |
4237 | ||
8e87d142 | 4238 | default: |
6be36555 | 4239 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4240 | |
ba13ccd9 | 4241 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4242 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4243 | goto done; |
4244 | } | |
4245 | ||
59e54bd1 | 4246 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4247 | goto done; |
4248 | ||
c1360a1c | 4249 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4250 | |
c1360a1c | 4251 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4252 | set_default_fcs(chan); |
fcc203c3 | 4253 | |
105bdf9e MM |
4254 | if (chan->mode == L2CAP_MODE_ERTM || |
4255 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4256 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4257 | |
3c588192 | 4258 | if (err < 0) |
5e4e3972 | 4259 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4260 | else |
4261 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4262 | } |
4263 | ||
4264 | done: | |
6be36555 | 4265 | l2cap_chan_unlock(chan); |
3c588192 | 4266 | return err; |
1da177e4 LT |
4267 | } |
4268 | ||
2d792818 | 4269 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4270 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4271 | u8 *data) | |
1da177e4 LT |
4272 | { |
4273 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4274 | struct l2cap_disconn_rsp rsp; | |
4275 | u16 dcid, scid; | |
48454079 | 4276 | struct l2cap_chan *chan; |
1da177e4 | 4277 | |
cb3b3152 JH |
4278 | if (cmd_len != sizeof(*req)) |
4279 | return -EPROTO; | |
4280 | ||
1da177e4 LT |
4281 | scid = __le16_to_cpu(req->scid); |
4282 | dcid = __le16_to_cpu(req->dcid); | |
4283 | ||
4284 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4285 | ||
3df91ea2 AE |
4286 | mutex_lock(&conn->chan_lock); |
4287 | ||
4288 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4289 | if (!chan) { | |
4290 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4291 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4292 | return 0; | |
3df91ea2 | 4293 | } |
1da177e4 | 4294 | |
6be36555 AE |
4295 | l2cap_chan_lock(chan); |
4296 | ||
fe4128e0 GP |
4297 | rsp.dcid = cpu_to_le16(chan->scid); |
4298 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4299 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4300 | ||
5ec1bbe5 | 4301 | chan->ops->set_shutdown(chan); |
1da177e4 | 4302 | |
61d6ef3e | 4303 | l2cap_chan_hold(chan); |
48454079 | 4304 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4305 | |
4306 | l2cap_chan_unlock(chan); | |
1da177e4 | 4307 | |
80b98027 | 4308 | chan->ops->close(chan); |
61d6ef3e | 4309 | l2cap_chan_put(chan); |
3df91ea2 AE |
4310 | |
4311 | mutex_unlock(&conn->chan_lock); | |
4312 | ||
1da177e4 LT |
4313 | return 0; |
4314 | } | |
4315 | ||
2d792818 | 4316 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4317 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4318 | u8 *data) | |
1da177e4 LT |
4319 | { |
4320 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4321 | u16 dcid, scid; | |
48454079 | 4322 | struct l2cap_chan *chan; |
1da177e4 | 4323 | |
cb3b3152 JH |
4324 | if (cmd_len != sizeof(*rsp)) |
4325 | return -EPROTO; | |
4326 | ||
1da177e4 LT |
4327 | scid = __le16_to_cpu(rsp->scid); |
4328 | dcid = __le16_to_cpu(rsp->dcid); | |
4329 | ||
4330 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4331 | ||
3df91ea2 AE |
4332 | mutex_lock(&conn->chan_lock); |
4333 | ||
4334 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4335 | if (!chan) { | |
4336 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4337 | return 0; |
3df91ea2 | 4338 | } |
1da177e4 | 4339 | |
6be36555 | 4340 | l2cap_chan_lock(chan); |
48454079 | 4341 | |
61d6ef3e | 4342 | l2cap_chan_hold(chan); |
48454079 | 4343 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4344 | |
4345 | l2cap_chan_unlock(chan); | |
1da177e4 | 4346 | |
80b98027 | 4347 | chan->ops->close(chan); |
61d6ef3e | 4348 | l2cap_chan_put(chan); |
3df91ea2 AE |
4349 | |
4350 | mutex_unlock(&conn->chan_lock); | |
4351 | ||
1da177e4 LT |
4352 | return 0; |
4353 | } | |
4354 | ||
2d792818 | 4355 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4356 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4357 | u8 *data) | |
1da177e4 LT |
4358 | { |
4359 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4360 | u16 type; |
4361 | ||
cb3b3152 JH |
4362 | if (cmd_len != sizeof(*req)) |
4363 | return -EPROTO; | |
4364 | ||
1da177e4 LT |
4365 | type = __le16_to_cpu(req->type); |
4366 | ||
4367 | BT_DBG("type 0x%4.4x", type); | |
4368 | ||
f0709e03 MH |
4369 | if (type == L2CAP_IT_FEAT_MASK) { |
4370 | u8 buf[8]; | |
44dd46de | 4371 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4372 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
dcf4adbf JP |
4373 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4374 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4375 | if (!disable_ertm) |
fcc203c3 | 4376 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4377 | | L2CAP_FEAT_FCS; |
848566b3 | 4378 | if (conn->hs_enabled) |
6327eb98 | 4379 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4380 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4381 | |
1b7bf4ed | 4382 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4383 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4384 | buf); | |
e1027a7c MH |
4385 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4386 | u8 buf[12]; | |
4387 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4388 | |
848566b3 | 4389 | if (conn->hs_enabled) |
50a147cd MM |
4390 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; |
4391 | else | |
4392 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4393 | ||
dcf4adbf JP |
4394 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4395 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4396 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4397 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4398 | buf); | |
f0709e03 MH |
4399 | } else { |
4400 | struct l2cap_info_rsp rsp; | |
4401 | rsp.type = cpu_to_le16(type); | |
dcf4adbf | 4402 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4403 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4404 | &rsp); | |
f0709e03 | 4405 | } |
1da177e4 LT |
4406 | |
4407 | return 0; | |
4408 | } | |
4409 | ||
2d792818 | 4410 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4411 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4412 | u8 *data) | |
1da177e4 LT |
4413 | { |
4414 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4415 | u16 type, result; | |
4416 | ||
3f6fa3d4 | 4417 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4418 | return -EPROTO; |
4419 | ||
1da177e4 LT |
4420 | type = __le16_to_cpu(rsp->type); |
4421 | result = __le16_to_cpu(rsp->result); | |
4422 | ||
4423 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4424 | ||
e90165be AE |
4425 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4426 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4427 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4428 | return 0; |
4429 | ||
17cd3f37 | 4430 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4431 | |
adb08ede VT |
4432 | if (result != L2CAP_IR_SUCCESS) { |
4433 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4434 | conn->info_ident = 0; | |
4435 | ||
4436 | l2cap_conn_start(conn); | |
4437 | ||
4438 | return 0; | |
4439 | } | |
4440 | ||
978c93b9 AE |
4441 | switch (type) { |
4442 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4443 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4444 | |
47ec1dcd | 4445 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4446 | struct l2cap_info_req req; |
dcf4adbf | 4447 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4448 | |
4449 | conn->info_ident = l2cap_get_ident(conn); | |
4450 | ||
4451 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4452 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4453 | } else { |
4454 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4455 | conn->info_ident = 0; | |
4456 | ||
4457 | l2cap_conn_start(conn); | |
4458 | } | |
978c93b9 AE |
4459 | break; |
4460 | ||
4461 | case L2CAP_IT_FIXED_CHAN: | |
4462 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4463 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4464 | conn->info_ident = 0; |
984947dc MH |
4465 | |
4466 | l2cap_conn_start(conn); | |
978c93b9 | 4467 | break; |
984947dc | 4468 | } |
4e8402a3 | 4469 | |
1da177e4 LT |
4470 | return 0; |
4471 | } | |
4472 | ||
1700915f MM |
4473 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4474 | struct l2cap_cmd_hdr *cmd, | |
4475 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4476 | { |
4477 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4478 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4479 | struct l2cap_chan *chan; |
6e1df6a6 | 4480 | struct hci_dev *hdev; |
f94ff6ff MM |
4481 | u16 psm, scid; |
4482 | ||
4483 | if (cmd_len != sizeof(*req)) | |
4484 | return -EPROTO; | |
4485 | ||
848566b3 | 4486 | if (!conn->hs_enabled) |
f94ff6ff MM |
4487 | return -EINVAL; |
4488 | ||
4489 | psm = le16_to_cpu(req->psm); | |
4490 | scid = le16_to_cpu(req->scid); | |
4491 | ||
ad0ac6ca | 4492 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4493 | |
6e1df6a6 | 4494 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4495 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4496 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4497 | req->amp_id); | |
4498 | return 0; | |
4499 | } | |
1700915f | 4500 | |
6e1df6a6 AE |
4501 | /* Validate AMP controller id */ |
4502 | hdev = hci_dev_get(req->amp_id); | |
4503 | if (!hdev) | |
4504 | goto error; | |
1700915f | 4505 | |
6e1df6a6 AE |
4506 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4507 | hci_dev_put(hdev); | |
4508 | goto error; | |
4509 | } | |
1700915f | 4510 | |
6e1df6a6 AE |
4511 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4512 | req->amp_id); | |
4513 | if (chan) { | |
4514 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4515 | struct hci_conn *hs_hcon; | |
1700915f | 4516 | |
98e0f7ea MH |
4517 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4518 | &conn->hcon->dst); | |
6e1df6a6 AE |
4519 | if (!hs_hcon) { |
4520 | hci_dev_put(hdev); | |
662d652d JH |
4521 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4522 | chan->dcid); | |
4523 | return 0; | |
1700915f MM |
4524 | } |
4525 | ||
6e1df6a6 AE |
4526 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4527 | ||
6e1df6a6 AE |
4528 | mgr->bredr_chan = chan; |
4529 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4530 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4531 | conn->mtu = hdev->block_mtu; |
1700915f | 4532 | } |
f94ff6ff | 4533 | |
6e1df6a6 | 4534 | hci_dev_put(hdev); |
f94ff6ff MM |
4535 | |
4536 | return 0; | |
6e1df6a6 AE |
4537 | |
4538 | error: | |
4539 | rsp.dcid = 0; | |
4540 | rsp.scid = cpu_to_le16(scid); | |
dcf4adbf JP |
4541 | rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); |
4542 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
6e1df6a6 AE |
4543 | |
4544 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4545 | sizeof(rsp), &rsp); | |
4546 | ||
dc280801 | 4547 | return 0; |
f94ff6ff MM |
4548 | } |
4549 | ||
8eb200bd MM |
4550 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4551 | { | |
4552 | struct l2cap_move_chan_req req; | |
4553 | u8 ident; | |
4554 | ||
4555 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4556 | ||
4557 | ident = l2cap_get_ident(chan->conn); | |
4558 | chan->ident = ident; | |
4559 | ||
4560 | req.icid = cpu_to_le16(chan->scid); | |
4561 | req.dest_amp_id = dest_amp_id; | |
4562 | ||
4563 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4564 | &req); | |
4565 | ||
4566 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4567 | } | |
4568 | ||
1500109b | 4569 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4570 | { |
4571 | struct l2cap_move_chan_rsp rsp; | |
4572 | ||
1500109b | 4573 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4574 | |
1500109b | 4575 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4576 | rsp.result = cpu_to_le16(result); |
4577 | ||
1500109b MM |
4578 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4579 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4580 | } |
4581 | ||
5b155ef9 | 4582 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4583 | { |
4584 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4585 | |
5b155ef9 | 4586 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4587 | |
5b155ef9 | 4588 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4589 | |
5b155ef9 | 4590 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4591 | cfm.result = cpu_to_le16(result); |
4592 | ||
5b155ef9 MM |
4593 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4594 | sizeof(cfm), &cfm); | |
4595 | ||
4596 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4597 | } | |
4598 | ||
4599 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4600 | { | |
4601 | struct l2cap_move_chan_cfm cfm; | |
4602 | ||
4603 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4604 | ||
4605 | cfm.icid = cpu_to_le16(icid); | |
dcf4adbf | 4606 | cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); |
5b155ef9 MM |
4607 | |
4608 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4609 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4610 | } |
4611 | ||
4612 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4613 | u16 icid) |
8d5a04a1 MM |
4614 | { |
4615 | struct l2cap_move_chan_cfm_rsp rsp; | |
4616 | ||
ad0ac6ca | 4617 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4618 | |
4619 | rsp.icid = cpu_to_le16(icid); | |
4620 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4621 | } | |
4622 | ||
5f3847a4 MM |
4623 | static void __release_logical_link(struct l2cap_chan *chan) |
4624 | { | |
4625 | chan->hs_hchan = NULL; | |
4626 | chan->hs_hcon = NULL; | |
4627 | ||
4628 | /* Placeholder - release the logical link */ | |
4629 | } | |
4630 | ||
1500109b MM |
4631 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4632 | { | |
4633 | /* Logical link setup failed */ | |
4634 | if (chan->state != BT_CONNECTED) { | |
4635 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4636 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4637 | return; |
4638 | } | |
4639 | ||
4640 | switch (chan->move_role) { | |
4641 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4642 | l2cap_move_done(chan); | |
4643 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4644 | break; | |
4645 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4646 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4647 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4648 | /* Remote has only sent pending or | |
4649 | * success responses, clean up | |
4650 | */ | |
4651 | l2cap_move_done(chan); | |
4652 | } | |
4653 | ||
4654 | /* Other amp move states imply that the move | |
4655 | * has already aborted | |
4656 | */ | |
4657 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4658 | break; | |
4659 | } | |
4660 | } | |
4661 | ||
4662 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4663 | struct hci_chan *hchan) | |
4664 | { | |
4665 | struct l2cap_conf_rsp rsp; | |
1500109b | 4666 | |
336178a3 | 4667 | chan->hs_hchan = hchan; |
1500109b MM |
4668 | chan->hs_hcon->l2cap_data = chan->conn; |
4669 | ||
35ba9561 | 4670 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4671 | |
4672 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4673 | int err; |
1500109b MM |
4674 | |
4675 | set_default_fcs(chan); | |
4676 | ||
4677 | err = l2cap_ertm_init(chan); | |
4678 | if (err < 0) | |
5e4e3972 | 4679 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4680 | else |
4681 | l2cap_chan_ready(chan); | |
4682 | } | |
4683 | } | |
4684 | ||
4685 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4686 | struct hci_chan *hchan) | |
4687 | { | |
4688 | chan->hs_hcon = hchan->conn; | |
4689 | chan->hs_hcon->l2cap_data = chan->conn; | |
4690 | ||
4691 | BT_DBG("move_state %d", chan->move_state); | |
4692 | ||
4693 | switch (chan->move_state) { | |
4694 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4695 | /* Move confirm will be sent after a success | |
4696 | * response is received | |
4697 | */ | |
4698 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4699 | break; | |
4700 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4701 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4702 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4703 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4704 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4705 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4706 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4707 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4708 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4709 | } | |
4710 | break; | |
4711 | default: | |
4712 | /* Move was not in expected state, free the channel */ | |
4713 | __release_logical_link(chan); | |
4714 | ||
4715 | chan->move_state = L2CAP_MOVE_STABLE; | |
4716 | } | |
4717 | } | |
4718 | ||
4719 | /* Call with chan locked */ | |
27695fb4 AE |
4720 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4721 | u8 status) | |
5b155ef9 | 4722 | { |
1500109b MM |
4723 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4724 | ||
4725 | if (status) { | |
4726 | l2cap_logical_fail(chan); | |
4727 | __release_logical_link(chan); | |
4728 | return; | |
4729 | } | |
4730 | ||
4731 | if (chan->state != BT_CONNECTED) { | |
4732 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4733 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4734 | l2cap_logical_finish_create(chan, hchan); |
4735 | } else { | |
4736 | l2cap_logical_finish_move(chan, hchan); | |
4737 | } | |
5b155ef9 MM |
4738 | } |
4739 | ||
3f7a56c4 MM |
4740 | void l2cap_move_start(struct l2cap_chan *chan) |
4741 | { | |
4742 | BT_DBG("chan %p", chan); | |
4743 | ||
6ed971ca | 4744 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4745 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4746 | return; | |
4747 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4748 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4749 | /* Placeholder - start physical link setup */ | |
4750 | } else { | |
4751 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4752 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4753 | chan->move_id = 0; | |
4754 | l2cap_move_setup(chan); | |
4755 | l2cap_send_move_chan_req(chan, 0); | |
4756 | } | |
4757 | } | |
4758 | ||
8eb200bd MM |
4759 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4760 | u8 local_amp_id, u8 remote_amp_id) | |
4761 | { | |
62748ca1 AE |
4762 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4763 | local_amp_id, remote_amp_id); | |
4764 | ||
12d6cc60 AE |
4765 | chan->fcs = L2CAP_FCS_NONE; |
4766 | ||
62748ca1 AE |
4767 | /* Outgoing channel on AMP */ |
4768 | if (chan->state == BT_CONNECT) { | |
4769 | if (result == L2CAP_CR_SUCCESS) { | |
4770 | chan->local_amp_id = local_amp_id; | |
4771 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4772 | } else { | |
4773 | /* Revert to BR/EDR connect */ | |
4774 | l2cap_send_conn_req(chan); | |
4775 | } | |
4776 | ||
4777 | return; | |
4778 | } | |
4779 | ||
4780 | /* Incoming channel on AMP */ | |
4781 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4782 | struct l2cap_conn_rsp rsp; |
4783 | char buf[128]; | |
4784 | rsp.scid = cpu_to_le16(chan->dcid); | |
4785 | rsp.dcid = cpu_to_le16(chan->scid); | |
4786 | ||
8eb200bd MM |
4787 | if (result == L2CAP_CR_SUCCESS) { |
4788 | /* Send successful response */ | |
dcf4adbf JP |
4789 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
4790 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4791 | } else { |
4792 | /* Send negative response */ | |
dcf4adbf JP |
4793 | rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); |
4794 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4795 | } |
4796 | ||
4797 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4798 | sizeof(rsp), &rsp); | |
4799 | ||
4800 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4801 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4802 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4803 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4804 | L2CAP_CONF_REQ, | |
4805 | l2cap_build_conf_req(chan, buf), buf); | |
4806 | chan->num_conf_req++; | |
4807 | } | |
8eb200bd MM |
4808 | } |
4809 | } | |
4810 | ||
4811 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4812 | u8 remote_amp_id) | |
4813 | { | |
4814 | l2cap_move_setup(chan); | |
4815 | chan->move_id = local_amp_id; | |
4816 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4817 | ||
4818 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4819 | } | |
4820 | ||
4821 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4822 | { | |
4823 | struct hci_chan *hchan = NULL; | |
4824 | ||
4825 | /* Placeholder - get hci_chan for logical link */ | |
4826 | ||
4827 | if (hchan) { | |
4828 | if (hchan->state == BT_CONNECTED) { | |
4829 | /* Logical link is ready to go */ | |
4830 | chan->hs_hcon = hchan->conn; | |
4831 | chan->hs_hcon->l2cap_data = chan->conn; | |
4832 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4833 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4834 | ||
4835 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4836 | } else { | |
4837 | /* Wait for logical link to be ready */ | |
4838 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4839 | } | |
4840 | } else { | |
4841 | /* Logical link not available */ | |
4842 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4843 | } | |
4844 | } | |
4845 | ||
4846 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4847 | { | |
4848 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4849 | u8 rsp_result; | |
4850 | if (result == -EINVAL) | |
4851 | rsp_result = L2CAP_MR_BAD_ID; | |
4852 | else | |
4853 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4854 | ||
4855 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4856 | } | |
4857 | ||
4858 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4859 | chan->move_state = L2CAP_MOVE_STABLE; | |
4860 | ||
4861 | /* Restart data transmission */ | |
4862 | l2cap_ertm_send(chan); | |
4863 | } | |
4864 | ||
a514b17f AE |
4865 | /* Invoke with locked chan */ |
4866 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4867 | { |
770bfefa | 4868 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4869 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4870 | |
8eb200bd MM |
4871 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4872 | chan, result, local_amp_id, remote_amp_id); | |
4873 | ||
8eb200bd MM |
4874 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4875 | l2cap_chan_unlock(chan); | |
4876 | return; | |
4877 | } | |
4878 | ||
4879 | if (chan->state != BT_CONNECTED) { | |
4880 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4881 | } else if (result != L2CAP_MR_SUCCESS) { | |
4882 | l2cap_do_move_cancel(chan, result); | |
4883 | } else { | |
4884 | switch (chan->move_role) { | |
4885 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4886 | l2cap_do_move_initiate(chan, local_amp_id, | |
4887 | remote_amp_id); | |
4888 | break; | |
4889 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4890 | l2cap_do_move_respond(chan, result); | |
4891 | break; | |
4892 | default: | |
4893 | l2cap_do_move_cancel(chan, result); | |
4894 | break; | |
4895 | } | |
4896 | } | |
8eb200bd MM |
4897 | } |
4898 | ||
8d5a04a1 | 4899 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4900 | struct l2cap_cmd_hdr *cmd, |
4901 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4902 | { |
4903 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4904 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4905 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4906 | u16 icid = 0; |
4907 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4908 | ||
4909 | if (cmd_len != sizeof(*req)) | |
4910 | return -EPROTO; | |
4911 | ||
4912 | icid = le16_to_cpu(req->icid); | |
4913 | ||
ad0ac6ca | 4914 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4915 | |
848566b3 | 4916 | if (!conn->hs_enabled) |
8d5a04a1 MM |
4917 | return -EINVAL; |
4918 | ||
02b0fbb9 MM |
4919 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4920 | if (!chan) { | |
1500109b | 4921 | rsp.icid = cpu_to_le16(icid); |
dcf4adbf | 4922 | rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); |
1500109b MM |
4923 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, |
4924 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4925 | return 0; |
4926 | } | |
4927 | ||
1500109b MM |
4928 | chan->ident = cmd->ident; |
4929 | ||
02b0fbb9 MM |
4930 | if (chan->scid < L2CAP_CID_DYN_START || |
4931 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4932 | (chan->mode != L2CAP_MODE_ERTM && | |
4933 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4934 | result = L2CAP_MR_NOT_ALLOWED; | |
4935 | goto send_move_response; | |
4936 | } | |
4937 | ||
4938 | if (chan->local_amp_id == req->dest_amp_id) { | |
4939 | result = L2CAP_MR_SAME_ID; | |
4940 | goto send_move_response; | |
4941 | } | |
4942 | ||
6ed971ca | 4943 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4944 | struct hci_dev *hdev; |
4945 | hdev = hci_dev_get(req->dest_amp_id); | |
4946 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4947 | !test_bit(HCI_UP, &hdev->flags)) { | |
4948 | if (hdev) | |
4949 | hci_dev_put(hdev); | |
4950 | ||
4951 | result = L2CAP_MR_BAD_ID; | |
4952 | goto send_move_response; | |
4953 | } | |
4954 | hci_dev_put(hdev); | |
4955 | } | |
4956 | ||
4957 | /* Detect a move collision. Only send a collision response | |
4958 | * if this side has "lost", otherwise proceed with the move. | |
4959 | * The winner has the larger bd_addr. | |
4960 | */ | |
4961 | if ((__chan_is_moving(chan) || | |
4962 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4963 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4964 | result = L2CAP_MR_COLLISION; |
4965 | goto send_move_response; | |
4966 | } | |
4967 | ||
02b0fbb9 MM |
4968 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4969 | l2cap_move_setup(chan); | |
4970 | chan->move_id = req->dest_amp_id; | |
4971 | icid = chan->dcid; | |
4972 | ||
6ed971ca | 4973 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4974 | /* Moving to BR/EDR */ |
4975 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4976 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4977 | result = L2CAP_MR_PEND; | |
4978 | } else { | |
4979 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4980 | result = L2CAP_MR_SUCCESS; | |
4981 | } | |
4982 | } else { | |
4983 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4984 | /* Placeholder - uncomment when amp functions are available */ | |
4985 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4986 | result = L2CAP_MR_PEND; | |
4987 | } | |
4988 | ||
4989 | send_move_response: | |
1500109b | 4990 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4991 | |
02b0fbb9 MM |
4992 | l2cap_chan_unlock(chan); |
4993 | ||
8d5a04a1 MM |
4994 | return 0; |
4995 | } | |
4996 | ||
5b155ef9 MM |
4997 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4998 | { | |
4999 | struct l2cap_chan *chan; | |
5000 | struct hci_chan *hchan = NULL; | |
5001 | ||
5002 | chan = l2cap_get_chan_by_scid(conn, icid); | |
5003 | if (!chan) { | |
5004 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5005 | return; | |
5006 | } | |
5007 | ||
5008 | __clear_chan_timer(chan); | |
5009 | if (result == L2CAP_MR_PEND) | |
5010 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
5011 | ||
5012 | switch (chan->move_state) { | |
5013 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
5014 | /* Move confirm will be sent when logical link | |
5015 | * is complete. | |
5016 | */ | |
5017 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
5018 | break; | |
5019 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
5020 | if (result == L2CAP_MR_PEND) { | |
5021 | break; | |
5022 | } else if (test_bit(CONN_LOCAL_BUSY, | |
5023 | &chan->conn_state)) { | |
5024 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
5025 | } else { | |
5026 | /* Logical link is up or moving to BR/EDR, | |
5027 | * proceed with move | |
5028 | */ | |
5029 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
5030 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5031 | } | |
5032 | break; | |
5033 | case L2CAP_MOVE_WAIT_RSP: | |
5034 | /* Moving to AMP */ | |
5035 | if (result == L2CAP_MR_SUCCESS) { | |
5036 | /* Remote is ready, send confirm immediately | |
5037 | * after logical link is ready | |
5038 | */ | |
5039 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
5040 | } else { | |
5041 | /* Both logical link and move success | |
5042 | * are required to confirm | |
5043 | */ | |
5044 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
5045 | } | |
5046 | ||
5047 | /* Placeholder - get hci_chan for logical link */ | |
5048 | if (!hchan) { | |
5049 | /* Logical link not available */ | |
5050 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5051 | break; | |
5052 | } | |
5053 | ||
5054 | /* If the logical link is not yet connected, do not | |
5055 | * send confirmation. | |
5056 | */ | |
5057 | if (hchan->state != BT_CONNECTED) | |
5058 | break; | |
5059 | ||
5060 | /* Logical link is already ready to go */ | |
5061 | ||
5062 | chan->hs_hcon = hchan->conn; | |
5063 | chan->hs_hcon->l2cap_data = chan->conn; | |
5064 | ||
5065 | if (result == L2CAP_MR_SUCCESS) { | |
5066 | /* Can confirm now */ | |
5067 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5068 | } else { | |
5069 | /* Now only need move success | |
5070 | * to confirm | |
5071 | */ | |
5072 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
5073 | } | |
5074 | ||
5075 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
5076 | break; | |
5077 | default: | |
5078 | /* Any other amp move state means the move failed. */ | |
5079 | chan->move_id = chan->local_amp_id; | |
5080 | l2cap_move_done(chan); | |
5081 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5082 | } | |
5083 | ||
5084 | l2cap_chan_unlock(chan); | |
5085 | } | |
5086 | ||
5087 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5088 | u16 result) | |
5089 | { | |
5090 | struct l2cap_chan *chan; | |
5091 | ||
5092 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5093 | if (!chan) { | |
5094 | /* Could not locate channel, icid is best guess */ | |
5095 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5096 | return; | |
5097 | } | |
5098 | ||
5099 | __clear_chan_timer(chan); | |
5100 | ||
5101 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5102 | if (result == L2CAP_MR_COLLISION) { | |
5103 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5104 | } else { | |
5105 | /* Cleanup - cancel move */ | |
5106 | chan->move_id = chan->local_amp_id; | |
5107 | l2cap_move_done(chan); | |
5108 | } | |
5109 | } | |
5110 | ||
5111 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5112 | ||
5113 | l2cap_chan_unlock(chan); | |
5114 | } | |
5115 | ||
5116 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5117 | struct l2cap_cmd_hdr *cmd, | |
5118 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5119 | { |
5120 | struct l2cap_move_chan_rsp *rsp = data; | |
5121 | u16 icid, result; | |
5122 | ||
5123 | if (cmd_len != sizeof(*rsp)) | |
5124 | return -EPROTO; | |
5125 | ||
5126 | icid = le16_to_cpu(rsp->icid); | |
5127 | result = le16_to_cpu(rsp->result); | |
5128 | ||
ad0ac6ca | 5129 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5130 | |
5b155ef9 MM |
5131 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5132 | l2cap_move_continue(conn, icid, result); | |
5133 | else | |
5134 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5135 | |
5136 | return 0; | |
5137 | } | |
5138 | ||
5f3847a4 MM |
5139 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5140 | struct l2cap_cmd_hdr *cmd, | |
5141 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5142 | { |
5143 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5144 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5145 | u16 icid, result; |
5146 | ||
5147 | if (cmd_len != sizeof(*cfm)) | |
5148 | return -EPROTO; | |
5149 | ||
5150 | icid = le16_to_cpu(cfm->icid); | |
5151 | result = le16_to_cpu(cfm->result); | |
5152 | ||
ad0ac6ca | 5153 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5154 | |
5f3847a4 MM |
5155 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5156 | if (!chan) { | |
5157 | /* Spec requires a response even if the icid was not found */ | |
5158 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5159 | return 0; | |
5160 | } | |
5161 | ||
5162 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5163 | if (result == L2CAP_MC_CONFIRMED) { | |
5164 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5165 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5166 | __release_logical_link(chan); |
5167 | } else { | |
5168 | chan->move_id = chan->local_amp_id; | |
5169 | } | |
5170 | ||
5171 | l2cap_move_done(chan); | |
5172 | } | |
5173 | ||
8d5a04a1 MM |
5174 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5175 | ||
5f3847a4 MM |
5176 | l2cap_chan_unlock(chan); |
5177 | ||
8d5a04a1 MM |
5178 | return 0; |
5179 | } | |
5180 | ||
5181 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5182 | struct l2cap_cmd_hdr *cmd, |
5183 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5184 | { |
5185 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5186 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5187 | u16 icid; |
5188 | ||
5189 | if (cmd_len != sizeof(*rsp)) | |
5190 | return -EPROTO; | |
5191 | ||
5192 | icid = le16_to_cpu(rsp->icid); | |
5193 | ||
ad0ac6ca | 5194 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5195 | |
3fd71a0a MM |
5196 | chan = l2cap_get_chan_by_scid(conn, icid); |
5197 | if (!chan) | |
5198 | return 0; | |
5199 | ||
5200 | __clear_chan_timer(chan); | |
5201 | ||
5202 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5203 | chan->local_amp_id = chan->move_id; | |
5204 | ||
6ed971ca | 5205 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5206 | __release_logical_link(chan); |
5207 | ||
5208 | l2cap_move_done(chan); | |
5209 | } | |
5210 | ||
5211 | l2cap_chan_unlock(chan); | |
5212 | ||
8d5a04a1 MM |
5213 | return 0; |
5214 | } | |
5215 | ||
de73115a | 5216 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, |
2d792818 | 5217 | struct l2cap_cmd_hdr *cmd, |
203e639e | 5218 | u16 cmd_len, u8 *data) |
de73115a CT |
5219 | { |
5220 | struct hci_conn *hcon = conn->hcon; | |
5221 | struct l2cap_conn_param_update_req *req; | |
5222 | struct l2cap_conn_param_update_rsp rsp; | |
203e639e | 5223 | u16 min, max, latency, to_multiplier; |
2ce603eb | 5224 | int err; |
de73115a | 5225 | |
4dae2798 | 5226 | if (!test_bit(HCI_CONN_MASTER, &hcon->flags)) |
de73115a CT |
5227 | return -EINVAL; |
5228 | ||
de73115a CT |
5229 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5230 | return -EPROTO; | |
5231 | ||
5232 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5233 | min = __le16_to_cpu(req->min); |
5234 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5235 | latency = __le16_to_cpu(req->latency); |
5236 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5237 | ||
5238 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5239 | min, max, latency, to_multiplier); |
de73115a CT |
5240 | |
5241 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb | 5242 | |
d4905f24 | 5243 | err = hci_check_conn_params(min, max, latency, to_multiplier); |
2ce603eb | 5244 | if (err) |
dcf4adbf | 5245 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5246 | else |
dcf4adbf | 5247 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5248 | |
5249 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5250 | sizeof(rsp), &rsp); |
de73115a | 5251 | |
2ce603eb CT |
5252 | if (!err) |
5253 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
5254 | ||
de73115a CT |
5255 | return 0; |
5256 | } | |
5257 | ||
f1496dee JH |
5258 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5259 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5260 | u8 *data) | |
5261 | { | |
5262 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; | |
5263 | u16 dcid, mtu, mps, credits, result; | |
5264 | struct l2cap_chan *chan; | |
5265 | int err; | |
5266 | ||
5267 | if (cmd_len < sizeof(*rsp)) | |
5268 | return -EPROTO; | |
5269 | ||
5270 | dcid = __le16_to_cpu(rsp->dcid); | |
5271 | mtu = __le16_to_cpu(rsp->mtu); | |
5272 | mps = __le16_to_cpu(rsp->mps); | |
5273 | credits = __le16_to_cpu(rsp->credits); | |
5274 | result = __le16_to_cpu(rsp->result); | |
5275 | ||
5276 | if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) | |
5277 | return -EPROTO; | |
5278 | ||
5279 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", | |
5280 | dcid, mtu, mps, credits, result); | |
5281 | ||
5282 | mutex_lock(&conn->chan_lock); | |
5283 | ||
5284 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5285 | if (!chan) { | |
5286 | err = -EBADSLT; | |
5287 | goto unlock; | |
5288 | } | |
5289 | ||
5290 | err = 0; | |
5291 | ||
5292 | l2cap_chan_lock(chan); | |
5293 | ||
5294 | switch (result) { | |
5295 | case L2CAP_CR_SUCCESS: | |
5296 | chan->ident = 0; | |
5297 | chan->dcid = dcid; | |
5298 | chan->omtu = mtu; | |
5299 | chan->remote_mps = mps; | |
0cd75f7e | 5300 | chan->tx_credits = credits; |
f1496dee JH |
5301 | l2cap_chan_ready(chan); |
5302 | break; | |
5303 | ||
5304 | default: | |
5305 | l2cap_chan_del(chan, ECONNREFUSED); | |
5306 | break; | |
5307 | } | |
5308 | ||
5309 | l2cap_chan_unlock(chan); | |
5310 | ||
5311 | unlock: | |
5312 | mutex_unlock(&conn->chan_lock); | |
5313 | ||
5314 | return err; | |
5315 | } | |
5316 | ||
3300d9a9 | 5317 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5318 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5319 | u8 *data) | |
3300d9a9 CT |
5320 | { |
5321 | int err = 0; | |
5322 | ||
5323 | switch (cmd->code) { | |
5324 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5325 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5326 | break; |
5327 | ||
5328 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5329 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5330 | break; |
5331 | ||
5332 | case L2CAP_CONN_RSP: | |
f5a2598d | 5333 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5334 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5335 | break; |
5336 | ||
5337 | case L2CAP_CONF_REQ: | |
5338 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5339 | break; | |
5340 | ||
5341 | case L2CAP_CONF_RSP: | |
9245e737 | 5342 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5343 | break; |
5344 | ||
5345 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5346 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5347 | break; |
5348 | ||
5349 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5350 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5351 | break; |
5352 | ||
5353 | case L2CAP_ECHO_REQ: | |
5354 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5355 | break; | |
5356 | ||
5357 | case L2CAP_ECHO_RSP: | |
5358 | break; | |
5359 | ||
5360 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5361 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5362 | break; |
5363 | ||
5364 | case L2CAP_INFO_RSP: | |
9245e737 | 5365 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5366 | break; |
5367 | ||
f94ff6ff MM |
5368 | case L2CAP_CREATE_CHAN_REQ: |
5369 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5370 | break; | |
5371 | ||
8d5a04a1 MM |
5372 | case L2CAP_MOVE_CHAN_REQ: |
5373 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5374 | break; | |
5375 | ||
5376 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5377 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5378 | break; |
5379 | ||
5380 | case L2CAP_MOVE_CHAN_CFM: | |
5381 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5382 | break; | |
5383 | ||
5384 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5385 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5386 | break; |
5387 | ||
3300d9a9 CT |
5388 | default: |
5389 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5390 | err = -EINVAL; | |
5391 | break; | |
5392 | } | |
5393 | ||
5394 | return err; | |
5395 | } | |
5396 | ||
27e2d4c8 JH |
5397 | static int l2cap_le_connect_req(struct l2cap_conn *conn, |
5398 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5399 | u8 *data) | |
5400 | { | |
5401 | struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; | |
5402 | struct l2cap_le_conn_rsp rsp; | |
5403 | struct l2cap_chan *chan, *pchan; | |
0cd75f7e | 5404 | u16 dcid, scid, credits, mtu, mps; |
27e2d4c8 JH |
5405 | __le16 psm; |
5406 | u8 result; | |
5407 | ||
5408 | if (cmd_len != sizeof(*req)) | |
5409 | return -EPROTO; | |
5410 | ||
5411 | scid = __le16_to_cpu(req->scid); | |
5412 | mtu = __le16_to_cpu(req->mtu); | |
5413 | mps = __le16_to_cpu(req->mps); | |
5414 | psm = req->psm; | |
5415 | dcid = 0; | |
0cd75f7e | 5416 | credits = 0; |
27e2d4c8 JH |
5417 | |
5418 | if (mtu < 23 || mps < 23) | |
5419 | return -EPROTO; | |
5420 | ||
5421 | BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), | |
5422 | scid, mtu, mps); | |
5423 | ||
5424 | /* Check if we have socket listening on psm */ | |
5425 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, | |
5426 | &conn->hcon->dst, LE_LINK); | |
5427 | if (!pchan) { | |
5428 | result = L2CAP_CR_BAD_PSM; | |
5429 | chan = NULL; | |
5430 | goto response; | |
5431 | } | |
5432 | ||
5433 | mutex_lock(&conn->chan_lock); | |
5434 | l2cap_chan_lock(pchan); | |
5435 | ||
5436 | if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) { | |
5437 | result = L2CAP_CR_AUTHENTICATION; | |
5438 | chan = NULL; | |
5439 | goto response_unlock; | |
5440 | } | |
5441 | ||
5442 | /* Check if we already have channel with that dcid */ | |
5443 | if (__l2cap_get_chan_by_dcid(conn, scid)) { | |
5444 | result = L2CAP_CR_NO_MEM; | |
5445 | chan = NULL; | |
5446 | goto response_unlock; | |
5447 | } | |
5448 | ||
5449 | chan = pchan->ops->new_connection(pchan); | |
5450 | if (!chan) { | |
5451 | result = L2CAP_CR_NO_MEM; | |
5452 | goto response_unlock; | |
5453 | } | |
5454 | ||
0ce43ce6 JH |
5455 | l2cap_le_flowctl_init(chan); |
5456 | ||
27e2d4c8 JH |
5457 | bacpy(&chan->src, &conn->hcon->src); |
5458 | bacpy(&chan->dst, &conn->hcon->dst); | |
5459 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); | |
5460 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
5461 | chan->psm = psm; | |
5462 | chan->dcid = scid; | |
5463 | chan->omtu = mtu; | |
5464 | chan->remote_mps = mps; | |
0cd75f7e | 5465 | chan->tx_credits = __le16_to_cpu(req->credits); |
27e2d4c8 JH |
5466 | |
5467 | __l2cap_chan_add(conn, chan); | |
5468 | dcid = chan->scid; | |
0cd75f7e | 5469 | credits = chan->rx_credits; |
27e2d4c8 JH |
5470 | |
5471 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
5472 | ||
5473 | chan->ident = cmd->ident; | |
5474 | ||
5475 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { | |
5476 | l2cap_state_change(chan, BT_CONNECT2); | |
5477 | result = L2CAP_CR_PEND; | |
5478 | chan->ops->defer(chan); | |
5479 | } else { | |
5480 | l2cap_chan_ready(chan); | |
5481 | result = L2CAP_CR_SUCCESS; | |
5482 | } | |
5483 | ||
5484 | response_unlock: | |
5485 | l2cap_chan_unlock(pchan); | |
5486 | mutex_unlock(&conn->chan_lock); | |
5487 | ||
5488 | if (result == L2CAP_CR_PEND) | |
5489 | return 0; | |
5490 | ||
5491 | response: | |
5492 | if (chan) { | |
5493 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 5494 | rsp.mps = cpu_to_le16(chan->mps); |
27e2d4c8 JH |
5495 | } else { |
5496 | rsp.mtu = 0; | |
5497 | rsp.mps = 0; | |
5498 | } | |
5499 | ||
5500 | rsp.dcid = cpu_to_le16(dcid); | |
0cd75f7e | 5501 | rsp.credits = cpu_to_le16(credits); |
27e2d4c8 JH |
5502 | rsp.result = cpu_to_le16(result); |
5503 | ||
5504 | l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); | |
5505 | ||
5506 | return 0; | |
5507 | } | |
5508 | ||
fad5fc89 JH |
5509 | static inline int l2cap_le_credits(struct l2cap_conn *conn, |
5510 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5511 | u8 *data) | |
5512 | { | |
5513 | struct l2cap_le_credits *pkt; | |
5514 | struct l2cap_chan *chan; | |
0f1bfe4e | 5515 | u16 cid, credits, max_credits; |
fad5fc89 JH |
5516 | |
5517 | if (cmd_len != sizeof(*pkt)) | |
5518 | return -EPROTO; | |
5519 | ||
5520 | pkt = (struct l2cap_le_credits *) data; | |
5521 | cid = __le16_to_cpu(pkt->cid); | |
5522 | credits = __le16_to_cpu(pkt->credits); | |
5523 | ||
5524 | BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); | |
5525 | ||
5526 | chan = l2cap_get_chan_by_dcid(conn, cid); | |
5527 | if (!chan) | |
5528 | return -EBADSLT; | |
5529 | ||
0f1bfe4e JH |
5530 | max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; |
5531 | if (credits > max_credits) { | |
5532 | BT_ERR("LE credits overflow"); | |
5533 | l2cap_send_disconn_req(chan, ECONNRESET); | |
5534 | ||
5535 | /* Return 0 so that we don't trigger an unnecessary | |
5536 | * command reject packet. | |
5537 | */ | |
5538 | return 0; | |
5539 | } | |
5540 | ||
fad5fc89 JH |
5541 | chan->tx_credits += credits; |
5542 | ||
5543 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
5544 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
5545 | chan->tx_credits--; | |
5546 | } | |
5547 | ||
5548 | if (chan->tx_credits) | |
5549 | chan->ops->resume(chan); | |
5550 | ||
5551 | l2cap_chan_unlock(chan); | |
5552 | ||
5553 | return 0; | |
5554 | } | |
5555 | ||
71fb4197 JH |
5556 | static inline int l2cap_le_command_rej(struct l2cap_conn *conn, |
5557 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5558 | u8 *data) | |
5559 | { | |
5560 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; | |
5561 | struct l2cap_chan *chan; | |
5562 | ||
5563 | if (cmd_len < sizeof(*rej)) | |
5564 | return -EPROTO; | |
5565 | ||
5566 | mutex_lock(&conn->chan_lock); | |
5567 | ||
5568 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5569 | if (!chan) | |
5570 | goto done; | |
5571 | ||
5572 | l2cap_chan_lock(chan); | |
5573 | l2cap_chan_del(chan, ECONNREFUSED); | |
5574 | l2cap_chan_unlock(chan); | |
5575 | ||
5576 | done: | |
5577 | mutex_unlock(&conn->chan_lock); | |
5578 | return 0; | |
5579 | } | |
5580 | ||
3300d9a9 | 5581 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
203e639e JH |
5582 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5583 | u8 *data) | |
3300d9a9 | 5584 | { |
b5ecba64 JH |
5585 | int err = 0; |
5586 | ||
3300d9a9 CT |
5587 | switch (cmd->code) { |
5588 | case L2CAP_COMMAND_REJ: | |
71fb4197 | 5589 | l2cap_le_command_rej(conn, cmd, cmd_len, data); |
b5ecba64 | 5590 | break; |
3300d9a9 CT |
5591 | |
5592 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
b5ecba64 JH |
5593 | err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
5594 | break; | |
3300d9a9 CT |
5595 | |
5596 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
b5ecba64 | 5597 | break; |
3300d9a9 | 5598 | |
f1496dee JH |
5599 | case L2CAP_LE_CONN_RSP: |
5600 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5601 | break; |
f1496dee | 5602 | |
27e2d4c8 | 5603 | case L2CAP_LE_CONN_REQ: |
b5ecba64 JH |
5604 | err = l2cap_le_connect_req(conn, cmd, cmd_len, data); |
5605 | break; | |
27e2d4c8 | 5606 | |
fad5fc89 JH |
5607 | case L2CAP_LE_CREDITS: |
5608 | err = l2cap_le_credits(conn, cmd, cmd_len, data); | |
5609 | break; | |
5610 | ||
3defe01a | 5611 | case L2CAP_DISCONN_REQ: |
b5ecba64 JH |
5612 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
5613 | break; | |
3defe01a JH |
5614 | |
5615 | case L2CAP_DISCONN_RSP: | |
5616 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5617 | break; |
3defe01a | 5618 | |
3300d9a9 CT |
5619 | default: |
5620 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
b5ecba64 JH |
5621 | err = -EINVAL; |
5622 | break; | |
3300d9a9 | 5623 | } |
b5ecba64 JH |
5624 | |
5625 | return err; | |
3300d9a9 CT |
5626 | } |
5627 | ||
c5623556 JH |
5628 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5629 | struct sk_buff *skb) | |
5630 | { | |
69c4e4e8 | 5631 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5632 | struct l2cap_cmd_hdr *cmd; |
5633 | u16 len; | |
c5623556 JH |
5634 | int err; |
5635 | ||
69c4e4e8 | 5636 | if (hcon->type != LE_LINK) |
3b166295 | 5637 | goto drop; |
69c4e4e8 | 5638 | |
4f3e219d MH |
5639 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5640 | goto drop; | |
c5623556 | 5641 | |
4f3e219d MH |
5642 | cmd = (void *) skb->data; |
5643 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5644 | |
4f3e219d | 5645 | len = le16_to_cpu(cmd->len); |
c5623556 | 5646 | |
4f3e219d | 5647 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5648 | |
4f3e219d MH |
5649 | if (len != skb->len || !cmd->ident) { |
5650 | BT_DBG("corrupted command"); | |
5651 | goto drop; | |
5652 | } | |
c5623556 | 5653 | |
203e639e | 5654 | err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); |
4f3e219d MH |
5655 | if (err) { |
5656 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5657 | |
4f3e219d | 5658 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5659 | |
dcf4adbf | 5660 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5661 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5662 | sizeof(rej), &rej); | |
c5623556 JH |
5663 | } |
5664 | ||
3b166295 | 5665 | drop: |
c5623556 JH |
5666 | kfree_skb(skb); |
5667 | } | |
5668 | ||
3300d9a9 | 5669 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5670 | struct sk_buff *skb) |
1da177e4 | 5671 | { |
69c4e4e8 | 5672 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5673 | u8 *data = skb->data; |
5674 | int len = skb->len; | |
5675 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5676 | int err; |
1da177e4 LT |
5677 | |
5678 | l2cap_raw_recv(conn, skb); | |
5679 | ||
69c4e4e8 | 5680 | if (hcon->type != ACL_LINK) |
3b166295 | 5681 | goto drop; |
69c4e4e8 | 5682 | |
1da177e4 | 5683 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5684 | u16 cmd_len; |
1da177e4 LT |
5685 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5686 | data += L2CAP_CMD_HDR_SIZE; | |
5687 | len -= L2CAP_CMD_HDR_SIZE; | |
5688 | ||
88219a0f | 5689 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5690 | |
2d792818 GP |
5691 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5692 | cmd.ident); | |
1da177e4 | 5693 | |
88219a0f | 5694 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5695 | BT_DBG("corrupted command"); |
5696 | break; | |
5697 | } | |
5698 | ||
c5623556 | 5699 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5700 | if (err) { |
e2fd318e | 5701 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5702 | |
5703 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5704 | |
dcf4adbf | 5705 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5706 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5707 | sizeof(rej), &rej); | |
1da177e4 LT |
5708 | } |
5709 | ||
88219a0f AV |
5710 | data += cmd_len; |
5711 | len -= cmd_len; | |
1da177e4 LT |
5712 | } |
5713 | ||
3b166295 | 5714 | drop: |
1da177e4 LT |
5715 | kfree_skb(skb); |
5716 | } | |
5717 | ||
47d1ec61 | 5718 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5719 | { |
5720 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5721 | int hdr_size; |
5722 | ||
5723 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5724 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5725 | else | |
5726 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5727 | |
47d1ec61 | 5728 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5729 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5730 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5731 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5732 | ||
5733 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5734 | return -EBADMSG; |
fcc203c3 GP |
5735 | } |
5736 | return 0; | |
5737 | } | |
5738 | ||
6ea00485 | 5739 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5740 | { |
e31f7633 | 5741 | struct l2cap_ctrl control; |
d5392c8f | 5742 | |
e31f7633 | 5743 | BT_DBG("chan %p", chan); |
d5392c8f | 5744 | |
e31f7633 MM |
5745 | memset(&control, 0, sizeof(control)); |
5746 | control.sframe = 1; | |
5747 | control.final = 1; | |
5748 | control.reqseq = chan->buffer_seq; | |
5749 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5750 | |
e2ab4353 | 5751 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5752 | control.super = L2CAP_SUPER_RNR; |
5753 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5754 | } |
5755 | ||
e31f7633 MM |
5756 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5757 | chan->unacked_frames > 0) | |
5758 | __set_retrans_timer(chan); | |
d5392c8f | 5759 | |
e31f7633 | 5760 | /* Send pending iframes */ |
525cd185 | 5761 | l2cap_ertm_send(chan); |
d5392c8f | 5762 | |
e2ab4353 | 5763 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5764 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5765 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5766 | * send it now. | |
5767 | */ | |
5768 | control.super = L2CAP_SUPER_RR; | |
5769 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5770 | } |
5771 | } | |
5772 | ||
2d792818 GP |
5773 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5774 | struct sk_buff **last_frag) | |
18778a63 | 5775 | { |
84084a31 MM |
5776 | /* skb->len reflects data in skb as well as all fragments |
5777 | * skb->data_len reflects only data in fragments | |
5778 | */ | |
5779 | if (!skb_has_frag_list(skb)) | |
5780 | skb_shinfo(skb)->frag_list = new_frag; | |
5781 | ||
5782 | new_frag->next = NULL; | |
5783 | ||
5784 | (*last_frag)->next = new_frag; | |
5785 | *last_frag = new_frag; | |
5786 | ||
5787 | skb->len += new_frag->len; | |
5788 | skb->data_len += new_frag->len; | |
5789 | skb->truesize += new_frag->truesize; | |
5790 | } | |
5791 | ||
4b51dae9 MM |
5792 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5793 | struct l2cap_ctrl *control) | |
84084a31 MM |
5794 | { |
5795 | int err = -EINVAL; | |
18778a63 | 5796 | |
4b51dae9 | 5797 | switch (control->sar) { |
7e0ef6ee | 5798 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5799 | if (chan->sdu) |
5800 | break; | |
18778a63 | 5801 | |
80b98027 | 5802 | err = chan->ops->recv(chan, skb); |
84084a31 | 5803 | break; |
18778a63 | 5804 | |
7e0ef6ee | 5805 | case L2CAP_SAR_START: |
84084a31 MM |
5806 | if (chan->sdu) |
5807 | break; | |
18778a63 | 5808 | |
6f61fd47 | 5809 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5810 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5811 | |
84084a31 MM |
5812 | if (chan->sdu_len > chan->imtu) { |
5813 | err = -EMSGSIZE; | |
5814 | break; | |
5815 | } | |
1890d36b | 5816 | |
84084a31 MM |
5817 | if (skb->len >= chan->sdu_len) |
5818 | break; | |
18778a63 | 5819 | |
84084a31 MM |
5820 | chan->sdu = skb; |
5821 | chan->sdu_last_frag = skb; | |
18778a63 | 5822 | |
84084a31 MM |
5823 | skb = NULL; |
5824 | err = 0; | |
18778a63 GP |
5825 | break; |
5826 | ||
7e0ef6ee | 5827 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5828 | if (!chan->sdu) |
84084a31 | 5829 | break; |
18778a63 | 5830 | |
84084a31 MM |
5831 | append_skb_frag(chan->sdu, skb, |
5832 | &chan->sdu_last_frag); | |
5833 | skb = NULL; | |
18778a63 | 5834 | |
84084a31 MM |
5835 | if (chan->sdu->len >= chan->sdu_len) |
5836 | break; | |
4178ba46 | 5837 | |
84084a31 | 5838 | err = 0; |
18778a63 GP |
5839 | break; |
5840 | ||
7e0ef6ee | 5841 | case L2CAP_SAR_END: |
6f61fd47 | 5842 | if (!chan->sdu) |
84084a31 | 5843 | break; |
18778a63 | 5844 | |
84084a31 MM |
5845 | append_skb_frag(chan->sdu, skb, |
5846 | &chan->sdu_last_frag); | |
5847 | skb = NULL; | |
4178ba46 | 5848 | |
84084a31 MM |
5849 | if (chan->sdu->len != chan->sdu_len) |
5850 | break; | |
18778a63 | 5851 | |
80b98027 | 5852 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5853 | |
84084a31 MM |
5854 | if (!err) { |
5855 | /* Reassembly complete */ | |
5856 | chan->sdu = NULL; | |
5857 | chan->sdu_last_frag = NULL; | |
5858 | chan->sdu_len = 0; | |
1890d36b | 5859 | } |
18778a63 GP |
5860 | break; |
5861 | } | |
5862 | ||
84084a31 MM |
5863 | if (err) { |
5864 | kfree_skb(skb); | |
5865 | kfree_skb(chan->sdu); | |
5866 | chan->sdu = NULL; | |
5867 | chan->sdu_last_frag = NULL; | |
5868 | chan->sdu_len = 0; | |
5869 | } | |
18778a63 | 5870 | |
84084a31 | 5871 | return err; |
18778a63 GP |
5872 | } |
5873 | ||
32b32735 MM |
5874 | static int l2cap_resegment(struct l2cap_chan *chan) |
5875 | { | |
5876 | /* Placeholder */ | |
5877 | return 0; | |
5878 | } | |
5879 | ||
61aa4f5b | 5880 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5881 | { |
61aa4f5b | 5882 | u8 event; |
712132eb | 5883 | |
61aa4f5b MM |
5884 | if (chan->mode != L2CAP_MODE_ERTM) |
5885 | return; | |
712132eb | 5886 | |
61aa4f5b | 5887 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5888 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5889 | } |
5890 | ||
d2a7ac5d MM |
5891 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5892 | { | |
63838725 MM |
5893 | int err = 0; |
5894 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5895 | * until a gap is encountered. | |
5896 | */ | |
5897 | ||
5898 | BT_DBG("chan %p", chan); | |
5899 | ||
5900 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5901 | struct sk_buff *skb; | |
5902 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5903 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5904 | ||
5905 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5906 | ||
5907 | if (!skb) | |
5908 | break; | |
5909 | ||
5910 | skb_unlink(skb, &chan->srej_q); | |
5911 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5912 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5913 | if (err) | |
5914 | break; | |
5915 | } | |
5916 | ||
5917 | if (skb_queue_empty(&chan->srej_q)) { | |
5918 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5919 | l2cap_send_ack(chan); | |
5920 | } | |
5921 | ||
5922 | return err; | |
d2a7ac5d MM |
5923 | } |
5924 | ||
5925 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5926 | struct l2cap_ctrl *control) | |
5927 | { | |
f80842a8 MM |
5928 | struct sk_buff *skb; |
5929 | ||
5930 | BT_DBG("chan %p, control %p", chan, control); | |
5931 | ||
5932 | if (control->reqseq == chan->next_tx_seq) { | |
5933 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5934 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5935 | return; |
5936 | } | |
5937 | ||
5938 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5939 | ||
5940 | if (skb == NULL) { | |
5941 | BT_DBG("Seq %d not available for retransmission", | |
5942 | control->reqseq); | |
5943 | return; | |
5944 | } | |
5945 | ||
5946 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5947 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5948 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5949 | return; |
5950 | } | |
5951 | ||
5952 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5953 | ||
5954 | if (control->poll) { | |
5955 | l2cap_pass_to_tx(chan, control); | |
5956 | ||
5957 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5958 | l2cap_retransmit(chan, control); | |
5959 | l2cap_ertm_send(chan); | |
5960 | ||
5961 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5962 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5963 | chan->srej_save_reqseq = control->reqseq; | |
5964 | } | |
5965 | } else { | |
5966 | l2cap_pass_to_tx_fbit(chan, control); | |
5967 | ||
5968 | if (control->final) { | |
5969 | if (chan->srej_save_reqseq != control->reqseq || | |
5970 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5971 | &chan->conn_state)) | |
5972 | l2cap_retransmit(chan, control); | |
5973 | } else { | |
5974 | l2cap_retransmit(chan, control); | |
5975 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5976 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5977 | chan->srej_save_reqseq = control->reqseq; | |
5978 | } | |
5979 | } | |
5980 | } | |
d2a7ac5d MM |
5981 | } |
5982 | ||
5983 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5984 | struct l2cap_ctrl *control) | |
5985 | { | |
fcd289df MM |
5986 | struct sk_buff *skb; |
5987 | ||
5988 | BT_DBG("chan %p, control %p", chan, control); | |
5989 | ||
5990 | if (control->reqseq == chan->next_tx_seq) { | |
5991 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5992 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5993 | return; |
5994 | } | |
5995 | ||
5996 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5997 | ||
5998 | if (chan->max_tx && skb && | |
5999 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
6000 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 6001 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
6002 | return; |
6003 | } | |
6004 | ||
6005 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6006 | ||
6007 | l2cap_pass_to_tx(chan, control); | |
6008 | ||
6009 | if (control->final) { | |
6010 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
6011 | l2cap_retransmit_all(chan, control); | |
6012 | } else { | |
6013 | l2cap_retransmit_all(chan, control); | |
6014 | l2cap_ertm_send(chan); | |
6015 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
6016 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
6017 | } | |
d2a7ac5d MM |
6018 | } |
6019 | ||
4b51dae9 MM |
6020 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
6021 | { | |
6022 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
6023 | ||
6024 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
6025 | chan->expected_tx_seq); | |
6026 | ||
6027 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
6028 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 6029 | chan->tx_win) { |
4b51dae9 MM |
6030 | /* See notes below regarding "double poll" and |
6031 | * invalid packets. | |
6032 | */ | |
6033 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6034 | BT_DBG("Invalid/Ignore - after SREJ"); | |
6035 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6036 | } else { | |
6037 | BT_DBG("Invalid - in window after SREJ sent"); | |
6038 | return L2CAP_TXSEQ_INVALID; | |
6039 | } | |
6040 | } | |
6041 | ||
6042 | if (chan->srej_list.head == txseq) { | |
6043 | BT_DBG("Expected SREJ"); | |
6044 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
6045 | } | |
6046 | ||
6047 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
6048 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
6049 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
6050 | } | |
6051 | ||
6052 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
6053 | BT_DBG("Unexpected SREJ - not requested"); | |
6054 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
6055 | } | |
6056 | } | |
6057 | ||
6058 | if (chan->expected_tx_seq == txseq) { | |
6059 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
6060 | chan->tx_win) { | |
6061 | BT_DBG("Invalid - txseq outside tx window"); | |
6062 | return L2CAP_TXSEQ_INVALID; | |
6063 | } else { | |
6064 | BT_DBG("Expected"); | |
6065 | return L2CAP_TXSEQ_EXPECTED; | |
6066 | } | |
6067 | } | |
6068 | ||
6069 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 6070 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
6071 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
6072 | return L2CAP_TXSEQ_DUPLICATE; | |
6073 | } | |
6074 | ||
6075 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
6076 | /* A source of invalid packets is a "double poll" condition, | |
6077 | * where delays cause us to send multiple poll packets. If | |
6078 | * the remote stack receives and processes both polls, | |
6079 | * sequence numbers can wrap around in such a way that a | |
6080 | * resent frame has a sequence number that looks like new data | |
6081 | * with a sequence gap. This would trigger an erroneous SREJ | |
6082 | * request. | |
6083 | * | |
6084 | * Fortunately, this is impossible with a tx window that's | |
6085 | * less than half of the maximum sequence number, which allows | |
6086 | * invalid frames to be safely ignored. | |
6087 | * | |
6088 | * With tx window sizes greater than half of the tx window | |
6089 | * maximum, the frame is invalid and cannot be ignored. This | |
6090 | * causes a disconnect. | |
6091 | */ | |
6092 | ||
6093 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6094 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
6095 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6096 | } else { | |
6097 | BT_DBG("Invalid - txseq outside tx window"); | |
6098 | return L2CAP_TXSEQ_INVALID; | |
6099 | } | |
6100 | } else { | |
6101 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
6102 | return L2CAP_TXSEQ_UNEXPECTED; | |
6103 | } | |
6104 | } | |
6105 | ||
d2a7ac5d MM |
6106 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
6107 | struct l2cap_ctrl *control, | |
6108 | struct sk_buff *skb, u8 event) | |
6109 | { | |
6110 | int err = 0; | |
941247f9 | 6111 | bool skb_in_use = false; |
d2a7ac5d MM |
6112 | |
6113 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6114 | event); | |
6115 | ||
6116 | switch (event) { | |
6117 | case L2CAP_EV_RECV_IFRAME: | |
6118 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
6119 | case L2CAP_TXSEQ_EXPECTED: | |
6120 | l2cap_pass_to_tx(chan, control); | |
6121 | ||
6122 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6123 | BT_DBG("Busy, discarding expected seq %d", | |
6124 | control->txseq); | |
6125 | break; | |
6126 | } | |
6127 | ||
6128 | chan->expected_tx_seq = __next_seq(chan, | |
6129 | control->txseq); | |
6130 | ||
6131 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 6132 | skb_in_use = true; |
d2a7ac5d MM |
6133 | |
6134 | err = l2cap_reassemble_sdu(chan, skb, control); | |
6135 | if (err) | |
6136 | break; | |
6137 | ||
6138 | if (control->final) { | |
6139 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6140 | &chan->conn_state)) { | |
6141 | control->final = 0; | |
6142 | l2cap_retransmit_all(chan, control); | |
6143 | l2cap_ertm_send(chan); | |
6144 | } | |
6145 | } | |
6146 | ||
6147 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
6148 | l2cap_send_ack(chan); | |
6149 | break; | |
6150 | case L2CAP_TXSEQ_UNEXPECTED: | |
6151 | l2cap_pass_to_tx(chan, control); | |
6152 | ||
6153 | /* Can't issue SREJ frames in the local busy state. | |
6154 | * Drop this frame, it will be seen as missing | |
6155 | * when local busy is exited. | |
6156 | */ | |
6157 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6158 | BT_DBG("Busy, discarding unexpected seq %d", | |
6159 | control->txseq); | |
6160 | break; | |
6161 | } | |
6162 | ||
6163 | /* There was a gap in the sequence, so an SREJ | |
6164 | * must be sent for each missing frame. The | |
6165 | * current frame is stored for later use. | |
6166 | */ | |
6167 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6168 | skb_in_use = true; |
d2a7ac5d MM |
6169 | BT_DBG("Queued %p (queue len %d)", skb, |
6170 | skb_queue_len(&chan->srej_q)); | |
6171 | ||
6172 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
6173 | l2cap_seq_list_clear(&chan->srej_list); | |
6174 | l2cap_send_srej(chan, control->txseq); | |
6175 | ||
6176 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
6177 | break; | |
6178 | case L2CAP_TXSEQ_DUPLICATE: | |
6179 | l2cap_pass_to_tx(chan, control); | |
6180 | break; | |
6181 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6182 | break; | |
6183 | case L2CAP_TXSEQ_INVALID: | |
6184 | default: | |
5e4e3972 | 6185 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6186 | break; |
6187 | } | |
6188 | break; | |
6189 | case L2CAP_EV_RECV_RR: | |
6190 | l2cap_pass_to_tx(chan, control); | |
6191 | if (control->final) { | |
6192 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6193 | ||
e6a3ee6e MM |
6194 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
6195 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
6196 | control->final = 0; |
6197 | l2cap_retransmit_all(chan, control); | |
6198 | } | |
6199 | ||
6200 | l2cap_ertm_send(chan); | |
6201 | } else if (control->poll) { | |
6202 | l2cap_send_i_or_rr_or_rnr(chan); | |
6203 | } else { | |
6204 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6205 | &chan->conn_state) && | |
6206 | chan->unacked_frames) | |
6207 | __set_retrans_timer(chan); | |
6208 | ||
6209 | l2cap_ertm_send(chan); | |
6210 | } | |
6211 | break; | |
6212 | case L2CAP_EV_RECV_RNR: | |
6213 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6214 | l2cap_pass_to_tx(chan, control); | |
6215 | if (control && control->poll) { | |
6216 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6217 | l2cap_send_rr_or_rnr(chan, 0); | |
6218 | } | |
6219 | __clear_retrans_timer(chan); | |
6220 | l2cap_seq_list_clear(&chan->retrans_list); | |
6221 | break; | |
6222 | case L2CAP_EV_RECV_REJ: | |
6223 | l2cap_handle_rej(chan, control); | |
6224 | break; | |
6225 | case L2CAP_EV_RECV_SREJ: | |
6226 | l2cap_handle_srej(chan, control); | |
6227 | break; | |
6228 | default: | |
6229 | break; | |
6230 | } | |
6231 | ||
6232 | if (skb && !skb_in_use) { | |
6233 | BT_DBG("Freeing %p", skb); | |
6234 | kfree_skb(skb); | |
6235 | } | |
6236 | ||
6237 | return err; | |
6238 | } | |
6239 | ||
6240 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
6241 | struct l2cap_ctrl *control, | |
6242 | struct sk_buff *skb, u8 event) | |
6243 | { | |
6244 | int err = 0; | |
6245 | u16 txseq = control->txseq; | |
941247f9 | 6246 | bool skb_in_use = false; |
d2a7ac5d MM |
6247 | |
6248 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6249 | event); | |
6250 | ||
6251 | switch (event) { | |
6252 | case L2CAP_EV_RECV_IFRAME: | |
6253 | switch (l2cap_classify_txseq(chan, txseq)) { | |
6254 | case L2CAP_TXSEQ_EXPECTED: | |
6255 | /* Keep frame for reassembly later */ | |
6256 | l2cap_pass_to_tx(chan, control); | |
6257 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6258 | skb_in_use = true; |
d2a7ac5d MM |
6259 | BT_DBG("Queued %p (queue len %d)", skb, |
6260 | skb_queue_len(&chan->srej_q)); | |
6261 | ||
6262 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
6263 | break; | |
6264 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
6265 | l2cap_seq_list_pop(&chan->srej_list); | |
6266 | ||
6267 | l2cap_pass_to_tx(chan, control); | |
6268 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6269 | skb_in_use = true; |
d2a7ac5d MM |
6270 | BT_DBG("Queued %p (queue len %d)", skb, |
6271 | skb_queue_len(&chan->srej_q)); | |
6272 | ||
6273 | err = l2cap_rx_queued_iframes(chan); | |
6274 | if (err) | |
6275 | break; | |
6276 | ||
6277 | break; | |
6278 | case L2CAP_TXSEQ_UNEXPECTED: | |
6279 | /* Got a frame that can't be reassembled yet. | |
6280 | * Save it for later, and send SREJs to cover | |
6281 | * the missing frames. | |
6282 | */ | |
6283 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6284 | skb_in_use = true; |
d2a7ac5d MM |
6285 | BT_DBG("Queued %p (queue len %d)", skb, |
6286 | skb_queue_len(&chan->srej_q)); | |
6287 | ||
6288 | l2cap_pass_to_tx(chan, control); | |
6289 | l2cap_send_srej(chan, control->txseq); | |
6290 | break; | |
6291 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
6292 | /* This frame was requested with an SREJ, but | |
6293 | * some expected retransmitted frames are | |
6294 | * missing. Request retransmission of missing | |
6295 | * SREJ'd frames. | |
6296 | */ | |
6297 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6298 | skb_in_use = true; |
d2a7ac5d MM |
6299 | BT_DBG("Queued %p (queue len %d)", skb, |
6300 | skb_queue_len(&chan->srej_q)); | |
6301 | ||
6302 | l2cap_pass_to_tx(chan, control); | |
6303 | l2cap_send_srej_list(chan, control->txseq); | |
6304 | break; | |
6305 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
6306 | /* We've already queued this frame. Drop this copy. */ | |
6307 | l2cap_pass_to_tx(chan, control); | |
6308 | break; | |
6309 | case L2CAP_TXSEQ_DUPLICATE: | |
6310 | /* Expecting a later sequence number, so this frame | |
6311 | * was already received. Ignore it completely. | |
6312 | */ | |
6313 | break; | |
6314 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6315 | break; | |
6316 | case L2CAP_TXSEQ_INVALID: | |
6317 | default: | |
5e4e3972 | 6318 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6319 | break; |
6320 | } | |
6321 | break; | |
6322 | case L2CAP_EV_RECV_RR: | |
6323 | l2cap_pass_to_tx(chan, control); | |
6324 | if (control->final) { | |
6325 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6326 | ||
6327 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6328 | &chan->conn_state)) { | |
6329 | control->final = 0; | |
6330 | l2cap_retransmit_all(chan, control); | |
6331 | } | |
6332 | ||
6333 | l2cap_ertm_send(chan); | |
6334 | } else if (control->poll) { | |
6335 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6336 | &chan->conn_state) && | |
6337 | chan->unacked_frames) { | |
6338 | __set_retrans_timer(chan); | |
6339 | } | |
6340 | ||
6341 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6342 | l2cap_send_srej_tail(chan); | |
6343 | } else { | |
6344 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6345 | &chan->conn_state) && | |
6346 | chan->unacked_frames) | |
6347 | __set_retrans_timer(chan); | |
6348 | ||
6349 | l2cap_send_ack(chan); | |
6350 | } | |
6351 | break; | |
6352 | case L2CAP_EV_RECV_RNR: | |
6353 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6354 | l2cap_pass_to_tx(chan, control); | |
6355 | if (control->poll) { | |
6356 | l2cap_send_srej_tail(chan); | |
6357 | } else { | |
6358 | struct l2cap_ctrl rr_control; | |
6359 | memset(&rr_control, 0, sizeof(rr_control)); | |
6360 | rr_control.sframe = 1; | |
6361 | rr_control.super = L2CAP_SUPER_RR; | |
6362 | rr_control.reqseq = chan->buffer_seq; | |
6363 | l2cap_send_sframe(chan, &rr_control); | |
6364 | } | |
6365 | ||
6366 | break; | |
6367 | case L2CAP_EV_RECV_REJ: | |
6368 | l2cap_handle_rej(chan, control); | |
6369 | break; | |
6370 | case L2CAP_EV_RECV_SREJ: | |
6371 | l2cap_handle_srej(chan, control); | |
6372 | break; | |
6373 | } | |
6374 | ||
6375 | if (skb && !skb_in_use) { | |
6376 | BT_DBG("Freeing %p", skb); | |
6377 | kfree_skb(skb); | |
6378 | } | |
6379 | ||
6380 | return err; | |
6381 | } | |
6382 | ||
32b32735 MM |
6383 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6384 | { | |
6385 | BT_DBG("chan %p", chan); | |
6386 | ||
6387 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6388 | ||
6389 | if (chan->hs_hcon) | |
6390 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6391 | else | |
6392 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6393 | ||
6394 | return l2cap_resegment(chan); | |
6395 | } | |
6396 | ||
6397 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6398 | struct l2cap_ctrl *control, | |
6399 | struct sk_buff *skb, u8 event) | |
6400 | { | |
6401 | int err; | |
6402 | ||
6403 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6404 | event); | |
6405 | ||
6406 | if (!control->poll) | |
6407 | return -EPROTO; | |
6408 | ||
6409 | l2cap_process_reqseq(chan, control->reqseq); | |
6410 | ||
6411 | if (!skb_queue_empty(&chan->tx_q)) | |
6412 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6413 | else | |
6414 | chan->tx_send_head = NULL; | |
6415 | ||
6416 | /* Rewind next_tx_seq to the point expected | |
6417 | * by the receiver. | |
6418 | */ | |
6419 | chan->next_tx_seq = control->reqseq; | |
6420 | chan->unacked_frames = 0; | |
6421 | ||
6422 | err = l2cap_finish_move(chan); | |
6423 | if (err) | |
6424 | return err; | |
6425 | ||
6426 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6427 | l2cap_send_i_or_rr_or_rnr(chan); | |
6428 | ||
6429 | if (event == L2CAP_EV_RECV_IFRAME) | |
6430 | return -EPROTO; | |
6431 | ||
6432 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6433 | } | |
6434 | ||
6435 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6436 | struct l2cap_ctrl *control, | |
6437 | struct sk_buff *skb, u8 event) | |
6438 | { | |
6439 | int err; | |
6440 | ||
6441 | if (!control->final) | |
6442 | return -EPROTO; | |
6443 | ||
6444 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6445 | ||
6446 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6447 | l2cap_process_reqseq(chan, control->reqseq); | |
6448 | ||
6449 | if (!skb_queue_empty(&chan->tx_q)) | |
6450 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6451 | else | |
6452 | chan->tx_send_head = NULL; | |
6453 | ||
6454 | /* Rewind next_tx_seq to the point expected | |
6455 | * by the receiver. | |
6456 | */ | |
6457 | chan->next_tx_seq = control->reqseq; | |
6458 | chan->unacked_frames = 0; | |
6459 | ||
6460 | if (chan->hs_hcon) | |
6461 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6462 | else | |
6463 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6464 | ||
6465 | err = l2cap_resegment(chan); | |
6466 | ||
6467 | if (!err) | |
6468 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6469 | ||
6470 | return err; | |
6471 | } | |
6472 | ||
d2a7ac5d MM |
6473 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6474 | { | |
6475 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6476 | u16 unacked; | |
6477 | ||
6478 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6479 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6480 | } | |
6481 | ||
cec8ab6e MM |
6482 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6483 | struct sk_buff *skb, u8 event) | |
218bb9df | 6484 | { |
d2a7ac5d MM |
6485 | int err = 0; |
6486 | ||
6487 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6488 | control, skb, event, chan->rx_state); | |
6489 | ||
6490 | if (__valid_reqseq(chan, control->reqseq)) { | |
6491 | switch (chan->rx_state) { | |
6492 | case L2CAP_RX_STATE_RECV: | |
6493 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6494 | break; | |
6495 | case L2CAP_RX_STATE_SREJ_SENT: | |
6496 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6497 | event); | |
6498 | break; | |
32b32735 MM |
6499 | case L2CAP_RX_STATE_WAIT_P: |
6500 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6501 | break; | |
6502 | case L2CAP_RX_STATE_WAIT_F: | |
6503 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6504 | break; | |
d2a7ac5d MM |
6505 | default: |
6506 | /* shut it down */ | |
6507 | break; | |
6508 | } | |
6509 | } else { | |
6510 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6511 | control->reqseq, chan->next_tx_seq, | |
6512 | chan->expected_ack_seq); | |
5e4e3972 | 6513 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6514 | } |
6515 | ||
6516 | return err; | |
cec8ab6e MM |
6517 | } |
6518 | ||
6519 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6520 | struct sk_buff *skb) | |
6521 | { | |
4b51dae9 MM |
6522 | int err = 0; |
6523 | ||
6524 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6525 | chan->rx_state); | |
6526 | ||
6527 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6528 | L2CAP_TXSEQ_EXPECTED) { | |
6529 | l2cap_pass_to_tx(chan, control); | |
6530 | ||
6531 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6532 | __next_seq(chan, chan->buffer_seq)); | |
6533 | ||
6534 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6535 | ||
6536 | l2cap_reassemble_sdu(chan, skb, control); | |
6537 | } else { | |
6538 | if (chan->sdu) { | |
6539 | kfree_skb(chan->sdu); | |
6540 | chan->sdu = NULL; | |
6541 | } | |
6542 | chan->sdu_last_frag = NULL; | |
6543 | chan->sdu_len = 0; | |
6544 | ||
6545 | if (skb) { | |
6546 | BT_DBG("Freeing %p", skb); | |
6547 | kfree_skb(skb); | |
6548 | } | |
6549 | } | |
6550 | ||
6551 | chan->last_acked_seq = control->txseq; | |
6552 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6553 | ||
6554 | return err; | |
cec8ab6e MM |
6555 | } |
6556 | ||
6557 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6558 | { | |
6559 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
6560 | u16 len; | |
6561 | u8 event; | |
218bb9df | 6562 | |
b76bbd66 MM |
6563 | __unpack_control(chan, skb); |
6564 | ||
218bb9df GP |
6565 | len = skb->len; |
6566 | ||
6567 | /* | |
6568 | * We can just drop the corrupted I-frame here. | |
6569 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6570 | * procedures and ask for retransmission. |
218bb9df | 6571 | */ |
47d1ec61 | 6572 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6573 | goto drop; |
6574 | ||
cec8ab6e | 6575 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6576 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6577 | |
47d1ec61 | 6578 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6579 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6580 | |
47d1ec61 | 6581 | if (len > chan->mps) { |
5e4e3972 | 6582 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6583 | goto drop; |
6584 | } | |
6585 | ||
cec8ab6e MM |
6586 | if (!control->sframe) { |
6587 | int err; | |
218bb9df | 6588 | |
cec8ab6e MM |
6589 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6590 | control->sar, control->reqseq, control->final, | |
6591 | control->txseq); | |
218bb9df | 6592 | |
cec8ab6e MM |
6593 | /* Validate F-bit - F=0 always valid, F=1 only |
6594 | * valid in TX WAIT_F | |
6595 | */ | |
6596 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6597 | goto drop; |
cec8ab6e MM |
6598 | |
6599 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6600 | event = L2CAP_EV_RECV_IFRAME; | |
6601 | err = l2cap_rx(chan, control, skb, event); | |
6602 | } else { | |
6603 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6604 | } |
6605 | ||
cec8ab6e | 6606 | if (err) |
5e4e3972 | 6607 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6608 | } else { |
cec8ab6e MM |
6609 | const u8 rx_func_to_event[4] = { |
6610 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6611 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6612 | }; | |
6613 | ||
6614 | /* Only I-frames are expected in streaming mode */ | |
6615 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6616 | goto drop; | |
6617 | ||
6618 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6619 | control->reqseq, control->final, control->poll, | |
6620 | control->super); | |
6621 | ||
218bb9df | 6622 | if (len != 0) { |
1bb166e6 | 6623 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6624 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6625 | goto drop; |
6626 | } | |
6627 | ||
cec8ab6e MM |
6628 | /* Validate F and P bits */ |
6629 | if (control->final && (control->poll || | |
6630 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6631 | goto drop; | |
6632 | ||
6633 | event = rx_func_to_event[control->super]; | |
6634 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6635 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6636 | } |
6637 | ||
6638 | return 0; | |
6639 | ||
6640 | drop: | |
6641 | kfree_skb(skb); | |
6642 | return 0; | |
6643 | } | |
6644 | ||
b1c325c2 JH |
6645 | static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) |
6646 | { | |
6647 | struct l2cap_conn *conn = chan->conn; | |
6648 | struct l2cap_le_credits pkt; | |
6649 | u16 return_credits; | |
6650 | ||
6651 | /* We return more credits to the sender only after the amount of | |
6652 | * credits falls below half of the initial amount. | |
6653 | */ | |
f15b8ecf | 6654 | if (chan->rx_credits >= (le_max_credits + 1) / 2) |
b1c325c2 JH |
6655 | return; |
6656 | ||
f15b8ecf | 6657 | return_credits = le_max_credits - chan->rx_credits; |
b1c325c2 JH |
6658 | |
6659 | BT_DBG("chan %p returning %u credits to sender", chan, return_credits); | |
6660 | ||
6661 | chan->rx_credits += return_credits; | |
6662 | ||
6663 | pkt.cid = cpu_to_le16(chan->scid); | |
6664 | pkt.credits = cpu_to_le16(return_credits); | |
6665 | ||
6666 | chan->ident = l2cap_get_ident(conn); | |
6667 | ||
6668 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); | |
6669 | } | |
6670 | ||
fad5fc89 JH |
6671 | static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
6672 | { | |
aac23bf6 JH |
6673 | int err; |
6674 | ||
6675 | if (!chan->rx_credits) { | |
6676 | BT_ERR("No credits to receive LE L2CAP data"); | |
dfd9774c | 6677 | l2cap_send_disconn_req(chan, ECONNRESET); |
fad5fc89 | 6678 | return -ENOBUFS; |
aac23bf6 | 6679 | } |
fad5fc89 | 6680 | |
aac23bf6 JH |
6681 | if (chan->imtu < skb->len) { |
6682 | BT_ERR("Too big LE L2CAP PDU"); | |
fad5fc89 | 6683 | return -ENOBUFS; |
aac23bf6 | 6684 | } |
fad5fc89 JH |
6685 | |
6686 | chan->rx_credits--; | |
6687 | BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); | |
6688 | ||
6689 | l2cap_chan_le_send_credits(chan); | |
6690 | ||
aac23bf6 JH |
6691 | err = 0; |
6692 | ||
6693 | if (!chan->sdu) { | |
6694 | u16 sdu_len; | |
6695 | ||
6696 | sdu_len = get_unaligned_le16(skb->data); | |
6697 | skb_pull(skb, L2CAP_SDULEN_SIZE); | |
6698 | ||
6699 | BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", | |
6700 | sdu_len, skb->len, chan->imtu); | |
6701 | ||
6702 | if (sdu_len > chan->imtu) { | |
6703 | BT_ERR("Too big LE L2CAP SDU length received"); | |
6704 | err = -EMSGSIZE; | |
6705 | goto failed; | |
6706 | } | |
6707 | ||
6708 | if (skb->len > sdu_len) { | |
6709 | BT_ERR("Too much LE L2CAP data received"); | |
6710 | err = -EINVAL; | |
6711 | goto failed; | |
6712 | } | |
6713 | ||
6714 | if (skb->len == sdu_len) | |
6715 | return chan->ops->recv(chan, skb); | |
6716 | ||
6717 | chan->sdu = skb; | |
6718 | chan->sdu_len = sdu_len; | |
6719 | chan->sdu_last_frag = skb; | |
6720 | ||
6721 | return 0; | |
6722 | } | |
6723 | ||
6724 | BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", | |
6725 | chan->sdu->len, skb->len, chan->sdu_len); | |
6726 | ||
6727 | if (chan->sdu->len + skb->len > chan->sdu_len) { | |
6728 | BT_ERR("Too much LE L2CAP data received"); | |
6729 | err = -EINVAL; | |
6730 | goto failed; | |
6731 | } | |
6732 | ||
6733 | append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); | |
6734 | skb = NULL; | |
6735 | ||
6736 | if (chan->sdu->len == chan->sdu_len) { | |
6737 | err = chan->ops->recv(chan, chan->sdu); | |
6738 | if (!err) { | |
6739 | chan->sdu = NULL; | |
6740 | chan->sdu_last_frag = NULL; | |
6741 | chan->sdu_len = 0; | |
6742 | } | |
6743 | } | |
6744 | ||
6745 | failed: | |
6746 | if (err) { | |
6747 | kfree_skb(skb); | |
6748 | kfree_skb(chan->sdu); | |
6749 | chan->sdu = NULL; | |
6750 | chan->sdu_last_frag = NULL; | |
6751 | chan->sdu_len = 0; | |
6752 | } | |
6753 | ||
6754 | /* We can't return an error here since we took care of the skb | |
6755 | * freeing internally. An error return would cause the caller to | |
6756 | * do a double-free of the skb. | |
6757 | */ | |
6758 | return 0; | |
fad5fc89 JH |
6759 | } |
6760 | ||
13ca56e0 AE |
6761 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6762 | struct sk_buff *skb) | |
1da177e4 | 6763 | { |
48454079 | 6764 | struct l2cap_chan *chan; |
1da177e4 | 6765 | |
baa7e1fa | 6766 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6767 | if (!chan) { |
97e8e89d AE |
6768 | if (cid == L2CAP_CID_A2MP) { |
6769 | chan = a2mp_channel_create(conn, skb); | |
6770 | if (!chan) { | |
6771 | kfree_skb(skb); | |
13ca56e0 | 6772 | return; |
97e8e89d AE |
6773 | } |
6774 | ||
6775 | l2cap_chan_lock(chan); | |
6776 | } else { | |
6777 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6778 | /* Drop packet and return */ | |
6779 | kfree_skb(skb); | |
13ca56e0 | 6780 | return; |
97e8e89d | 6781 | } |
1da177e4 LT |
6782 | } |
6783 | ||
49208c9c | 6784 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6785 | |
89bc500e | 6786 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6787 | goto drop; |
6788 | ||
0c1bc5c6 | 6789 | switch (chan->mode) { |
38319713 | 6790 | case L2CAP_MODE_LE_FLOWCTL: |
fad5fc89 JH |
6791 | if (l2cap_le_data_rcv(chan, skb) < 0) |
6792 | goto drop; | |
6793 | ||
6794 | goto done; | |
6795 | ||
1c2acffb GP |
6796 | case L2CAP_MODE_BASIC: |
6797 | /* If socket recv buffers overflows we drop data here | |
6798 | * which is *bad* because L2CAP has to be reliable. | |
6799 | * But we don't have any other choice. L2CAP doesn't | |
6800 | * provide flow control mechanism. */ | |
1da177e4 | 6801 | |
2c96e03d SJ |
6802 | if (chan->imtu < skb->len) { |
6803 | BT_ERR("Dropping L2CAP data: receive buffer overflow"); | |
1c2acffb | 6804 | goto drop; |
2c96e03d | 6805 | } |
1da177e4 | 6806 | |
80b98027 | 6807 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6808 | goto done; |
6809 | break; | |
6810 | ||
6811 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6812 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6813 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6814 | goto done; |
6815 | ||
1c2acffb | 6816 | default: |
0c1bc5c6 | 6817 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6818 | break; |
6819 | } | |
1da177e4 LT |
6820 | |
6821 | drop: | |
6822 | kfree_skb(skb); | |
6823 | ||
6824 | done: | |
6be36555 | 6825 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6826 | } |
6827 | ||
84104b24 AE |
6828 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6829 | struct sk_buff *skb) | |
1da177e4 | 6830 | { |
ae4fd2d3 | 6831 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6832 | struct l2cap_chan *chan; |
1da177e4 | 6833 | |
ae4fd2d3 MH |
6834 | if (hcon->type != ACL_LINK) |
6835 | goto drop; | |
6836 | ||
bf20fd4e JH |
6837 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, |
6838 | ACL_LINK); | |
23691d75 | 6839 | if (!chan) |
1da177e4 LT |
6840 | goto drop; |
6841 | ||
5b4cedaa | 6842 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6843 | |
89bc500e | 6844 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6845 | goto drop; |
6846 | ||
e13e21dc | 6847 | if (chan->imtu < skb->len) |
1da177e4 LT |
6848 | goto drop; |
6849 | ||
2edf870d | 6850 | /* Store remote BD_ADDR and PSM for msg_name */ |
06ae3314 | 6851 | bacpy(&bt_cb(skb)->bdaddr, &hcon->dst); |
2edf870d MH |
6852 | bt_cb(skb)->psm = psm; |
6853 | ||
80b98027 | 6854 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 6855 | return; |
1da177e4 LT |
6856 | |
6857 | drop: | |
6858 | kfree_skb(skb); | |
1da177e4 LT |
6859 | } |
6860 | ||
72f78356 | 6861 | static void l2cap_att_channel(struct l2cap_conn *conn, |
6810fca7 | 6862 | struct sk_buff *skb) |
9f69bda6 | 6863 | { |
b99707d7 | 6864 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6865 | struct l2cap_chan *chan; |
9f69bda6 | 6866 | |
b99707d7 MH |
6867 | if (hcon->type != LE_LINK) |
6868 | goto drop; | |
6869 | ||
af1c0134 | 6870 | chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT, |
06ae3314 | 6871 | &hcon->src, &hcon->dst); |
23691d75 | 6872 | if (!chan) |
9f69bda6 GP |
6873 | goto drop; |
6874 | ||
5b4cedaa | 6875 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 6876 | |
cc8dba2b MH |
6877 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type)) |
6878 | goto drop; | |
6879 | ||
e13e21dc | 6880 | if (chan->imtu < skb->len) |
9f69bda6 GP |
6881 | goto drop; |
6882 | ||
80b98027 | 6883 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 6884 | return; |
9f69bda6 GP |
6885 | |
6886 | drop: | |
6887 | kfree_skb(skb); | |
9f69bda6 GP |
6888 | } |
6889 | ||
1da177e4 LT |
6890 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
6891 | { | |
6892 | struct l2cap_hdr *lh = (void *) skb->data; | |
61a939c6 | 6893 | struct hci_conn *hcon = conn->hcon; |
8e036fc3 AV |
6894 | u16 cid, len; |
6895 | __le16 psm; | |
1da177e4 | 6896 | |
61a939c6 JH |
6897 | if (hcon->state != BT_CONNECTED) { |
6898 | BT_DBG("queueing pending rx skb"); | |
6899 | skb_queue_tail(&conn->pending_rx, skb); | |
6900 | return; | |
6901 | } | |
6902 | ||
1da177e4 LT |
6903 | skb_pull(skb, L2CAP_HDR_SIZE); |
6904 | cid = __le16_to_cpu(lh->cid); | |
6905 | len = __le16_to_cpu(lh->len); | |
6906 | ||
1c2acffb GP |
6907 | if (len != skb->len) { |
6908 | kfree_skb(skb); | |
6909 | return; | |
6910 | } | |
6911 | ||
1da177e4 LT |
6912 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6913 | ||
6914 | switch (cid) { | |
8db4dc46 | 6915 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6916 | l2cap_sig_channel(conn, skb); |
6917 | break; | |
6918 | ||
8db4dc46 | 6919 | case L2CAP_CID_CONN_LESS: |
097db76c | 6920 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6921 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6922 | l2cap_conless_channel(conn, psm, skb); |
6923 | break; | |
6924 | ||
073d1cf3 | 6925 | case L2CAP_CID_ATT: |
72f78356 | 6926 | l2cap_att_channel(conn, skb); |
9f69bda6 GP |
6927 | break; |
6928 | ||
a2877629 MH |
6929 | case L2CAP_CID_LE_SIGNALING: |
6930 | l2cap_le_sig_channel(conn, skb); | |
6931 | break; | |
6932 | ||
b501d6a1 AB |
6933 | case L2CAP_CID_SMP: |
6934 | if (smp_sig_channel(conn, skb)) | |
6935 | l2cap_conn_del(conn->hcon, EACCES); | |
6936 | break; | |
6937 | ||
1da177e4 LT |
6938 | default: |
6939 | l2cap_data_channel(conn, cid, skb); | |
6940 | break; | |
6941 | } | |
6942 | } | |
6943 | ||
61a939c6 JH |
6944 | static void process_pending_rx(struct work_struct *work) |
6945 | { | |
6946 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, | |
6947 | pending_rx_work); | |
6948 | struct sk_buff *skb; | |
6949 | ||
6950 | BT_DBG(""); | |
6951 | ||
6952 | while ((skb = skb_dequeue(&conn->pending_rx))) | |
6953 | l2cap_recv_frame(conn, skb); | |
6954 | } | |
6955 | ||
162b49e7 JH |
6956 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
6957 | { | |
6958 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6959 | struct hci_chan *hchan; | |
6960 | ||
6961 | if (conn) | |
6962 | return conn; | |
6963 | ||
6964 | hchan = hci_chan_create(hcon); | |
6965 | if (!hchan) | |
6966 | return NULL; | |
6967 | ||
6968 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); | |
6969 | if (!conn) { | |
6970 | hci_chan_del(hchan); | |
6971 | return NULL; | |
6972 | } | |
6973 | ||
6974 | kref_init(&conn->ref); | |
6975 | hcon->l2cap_data = conn; | |
6976 | conn->hcon = hcon; | |
6977 | hci_conn_get(conn->hcon); | |
6978 | conn->hchan = hchan; | |
6979 | ||
6980 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); | |
6981 | ||
6982 | switch (hcon->type) { | |
6983 | case LE_LINK: | |
6984 | if (hcon->hdev->le_mtu) { | |
6985 | conn->mtu = hcon->hdev->le_mtu; | |
6986 | break; | |
6987 | } | |
6988 | /* fall through */ | |
6989 | default: | |
6990 | conn->mtu = hcon->hdev->acl_mtu; | |
6991 | break; | |
6992 | } | |
6993 | ||
6994 | conn->feat_mask = 0; | |
6995 | ||
6996 | if (hcon->type == ACL_LINK) | |
6997 | conn->hs_enabled = test_bit(HCI_HS_ENABLED, | |
6998 | &hcon->hdev->dev_flags); | |
6999 | ||
7000 | spin_lock_init(&conn->lock); | |
7001 | mutex_init(&conn->chan_lock); | |
7002 | ||
7003 | INIT_LIST_HEAD(&conn->chan_l); | |
7004 | INIT_LIST_HEAD(&conn->users); | |
7005 | ||
7006 | if (hcon->type == LE_LINK) | |
7007 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); | |
7008 | else | |
7009 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); | |
7010 | ||
61a939c6 JH |
7011 | skb_queue_head_init(&conn->pending_rx); |
7012 | INIT_WORK(&conn->pending_rx_work, process_pending_rx); | |
7013 | ||
162b49e7 JH |
7014 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
7015 | ||
7016 | return conn; | |
7017 | } | |
7018 | ||
7019 | static bool is_valid_psm(u16 psm, u8 dst_type) { | |
7020 | if (!psm) | |
7021 | return false; | |
7022 | ||
7023 | if (bdaddr_type_is_le(dst_type)) | |
7024 | return (psm <= 0x00ff); | |
7025 | ||
7026 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
7027 | return ((psm & 0x0101) == 0x0001); | |
7028 | } | |
7029 | ||
7030 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, | |
7031 | bdaddr_t *dst, u8 dst_type) | |
7032 | { | |
7033 | struct l2cap_conn *conn; | |
7034 | struct hci_conn *hcon; | |
7035 | struct hci_dev *hdev; | |
7036 | __u8 auth_type; | |
7037 | int err; | |
7038 | ||
7039 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, | |
7040 | dst_type, __le16_to_cpu(psm)); | |
7041 | ||
7042 | hdev = hci_get_route(dst, &chan->src); | |
7043 | if (!hdev) | |
7044 | return -EHOSTUNREACH; | |
7045 | ||
7046 | hci_dev_lock(hdev); | |
7047 | ||
7048 | l2cap_chan_lock(chan); | |
7049 | ||
7050 | if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && | |
7051 | chan->chan_type != L2CAP_CHAN_RAW) { | |
7052 | err = -EINVAL; | |
7053 | goto done; | |
7054 | } | |
7055 | ||
21626e62 JH |
7056 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { |
7057 | err = -EINVAL; | |
7058 | goto done; | |
7059 | } | |
7060 | ||
7061 | if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { | |
162b49e7 JH |
7062 | err = -EINVAL; |
7063 | goto done; | |
7064 | } | |
7065 | ||
7066 | switch (chan->mode) { | |
7067 | case L2CAP_MODE_BASIC: | |
7068 | break; | |
7069 | case L2CAP_MODE_LE_FLOWCTL: | |
7070 | l2cap_le_flowctl_init(chan); | |
7071 | break; | |
7072 | case L2CAP_MODE_ERTM: | |
7073 | case L2CAP_MODE_STREAMING: | |
7074 | if (!disable_ertm) | |
7075 | break; | |
7076 | /* fall through */ | |
7077 | default: | |
7078 | err = -ENOTSUPP; | |
7079 | goto done; | |
7080 | } | |
7081 | ||
7082 | switch (chan->state) { | |
7083 | case BT_CONNECT: | |
7084 | case BT_CONNECT2: | |
7085 | case BT_CONFIG: | |
7086 | /* Already connecting */ | |
7087 | err = 0; | |
7088 | goto done; | |
7089 | ||
7090 | case BT_CONNECTED: | |
7091 | /* Already connected */ | |
7092 | err = -EISCONN; | |
7093 | goto done; | |
7094 | ||
7095 | case BT_OPEN: | |
7096 | case BT_BOUND: | |
7097 | /* Can connect */ | |
7098 | break; | |
7099 | ||
7100 | default: | |
7101 | err = -EBADFD; | |
7102 | goto done; | |
7103 | } | |
7104 | ||
7105 | /* Set destination address and psm */ | |
7106 | bacpy(&chan->dst, dst); | |
7107 | chan->dst_type = dst_type; | |
7108 | ||
7109 | chan->psm = psm; | |
7110 | chan->dcid = cid; | |
7111 | ||
7112 | auth_type = l2cap_get_auth_type(chan); | |
7113 | ||
6f77d8c7 AG |
7114 | if (bdaddr_type_is_le(dst_type)) { |
7115 | /* Convert from L2CAP channel address type to HCI address type | |
7116 | */ | |
7117 | if (dst_type == BDADDR_LE_PUBLIC) | |
7118 | dst_type = ADDR_LE_DEV_PUBLIC; | |
7119 | else | |
7120 | dst_type = ADDR_LE_DEV_RANDOM; | |
7121 | ||
04a6c589 AG |
7122 | hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level, |
7123 | auth_type); | |
6f77d8c7 | 7124 | } else { |
04a6c589 | 7125 | hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type); |
6f77d8c7 | 7126 | } |
162b49e7 JH |
7127 | |
7128 | if (IS_ERR(hcon)) { | |
7129 | err = PTR_ERR(hcon); | |
7130 | goto done; | |
7131 | } | |
7132 | ||
7133 | conn = l2cap_conn_add(hcon); | |
7134 | if (!conn) { | |
7135 | hci_conn_drop(hcon); | |
7136 | err = -ENOMEM; | |
7137 | goto done; | |
7138 | } | |
7139 | ||
7140 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { | |
7141 | hci_conn_drop(hcon); | |
7142 | err = -EBUSY; | |
7143 | goto done; | |
7144 | } | |
7145 | ||
7146 | /* Update source addr of the socket */ | |
7147 | bacpy(&chan->src, &hcon->src); | |
7148 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
7149 | ||
7150 | l2cap_chan_unlock(chan); | |
7151 | l2cap_chan_add(conn, chan); | |
7152 | l2cap_chan_lock(chan); | |
7153 | ||
7154 | /* l2cap_chan_add takes its own ref so we can drop this one */ | |
7155 | hci_conn_drop(hcon); | |
7156 | ||
7157 | l2cap_state_change(chan, BT_CONNECT); | |
7158 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
7159 | ||
61202e4d JH |
7160 | /* Release chan->sport so that it can be reused by other |
7161 | * sockets (as it's only used for listening sockets). | |
7162 | */ | |
7163 | write_lock(&chan_list_lock); | |
7164 | chan->sport = 0; | |
7165 | write_unlock(&chan_list_lock); | |
7166 | ||
162b49e7 JH |
7167 | if (hcon->state == BT_CONNECTED) { |
7168 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { | |
7169 | __clear_chan_timer(chan); | |
7170 | if (l2cap_chan_check_security(chan)) | |
7171 | l2cap_state_change(chan, BT_CONNECTED); | |
7172 | } else | |
7173 | l2cap_do_start(chan); | |
7174 | } | |
7175 | ||
7176 | err = 0; | |
7177 | ||
7178 | done: | |
7179 | l2cap_chan_unlock(chan); | |
7180 | hci_dev_unlock(hdev); | |
7181 | hci_dev_put(hdev); | |
7182 | return err; | |
7183 | } | |
6b8d4a6a | 7184 | EXPORT_SYMBOL_GPL(l2cap_chan_connect); |
162b49e7 | 7185 | |
1da177e4 LT |
7186 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
7187 | ||
686ebf28 | 7188 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
7189 | { |
7190 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 7191 | struct l2cap_chan *c; |
1da177e4 | 7192 | |
6ed93dc6 | 7193 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
7194 | |
7195 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
7196 | read_lock(&chan_list_lock); |
7197 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 7198 | if (c->state != BT_LISTEN) |
1da177e4 LT |
7199 | continue; |
7200 | ||
7eafc59e | 7201 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 7202 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 7203 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 7204 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 7205 | exact++; |
7eafc59e | 7206 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 7207 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 7208 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
7209 | lm2 |= HCI_LM_MASTER; |
7210 | } | |
1da177e4 | 7211 | } |
23691d75 | 7212 | read_unlock(&chan_list_lock); |
1da177e4 LT |
7213 | |
7214 | return exact ? lm1 : lm2; | |
7215 | } | |
7216 | ||
9e664631 | 7217 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 7218 | { |
0139418c MH |
7219 | struct l2cap_conn *conn; |
7220 | ||
6ed93dc6 | 7221 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 7222 | |
1da177e4 | 7223 | if (!status) { |
baf43251 | 7224 | conn = l2cap_conn_add(hcon); |
1da177e4 LT |
7225 | if (conn) |
7226 | l2cap_conn_ready(conn); | |
ba6fc317 | 7227 | } else { |
e175072f | 7228 | l2cap_conn_del(hcon, bt_to_errno(status)); |
ba6fc317 | 7229 | } |
1da177e4 LT |
7230 | } |
7231 | ||
686ebf28 | 7232 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
7233 | { |
7234 | struct l2cap_conn *conn = hcon->l2cap_data; | |
7235 | ||
7236 | BT_DBG("hcon %p", hcon); | |
7237 | ||
686ebf28 | 7238 | if (!conn) |
9f5a0d7b | 7239 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
7240 | return conn->disc_reason; |
7241 | } | |
7242 | ||
9e664631 | 7243 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
7244 | { |
7245 | BT_DBG("hcon %p reason %d", hcon, reason); | |
7246 | ||
e175072f | 7247 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
7248 | } |
7249 | ||
4343478f | 7250 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 7251 | { |
715ec005 | 7252 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
7253 | return; |
7254 | ||
f62e4323 | 7255 | if (encrypt == 0x00) { |
4343478f | 7256 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 7257 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
7d513e92 MH |
7258 | } else if (chan->sec_level == BT_SECURITY_HIGH || |
7259 | chan->sec_level == BT_SECURITY_FIPS) | |
0f852724 | 7260 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 7261 | } else { |
4343478f | 7262 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 7263 | __clear_chan_timer(chan); |
f62e4323 MH |
7264 | } |
7265 | } | |
7266 | ||
686ebf28 | 7267 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 7268 | { |
0139418c | 7269 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 7270 | struct l2cap_chan *chan; |
1da177e4 | 7271 | |
0139418c | 7272 | if (!conn) |
1da177e4 | 7273 | return 0; |
0139418c | 7274 | |
89d8b407 | 7275 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 7276 | |
160dc6ac | 7277 | if (hcon->type == LE_LINK) { |
35d4adcc | 7278 | if (!status && encrypt) |
4bd6d38e | 7279 | smp_distribute_keys(conn); |
17cd3f37 | 7280 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
7281 | } |
7282 | ||
3df91ea2 | 7283 | mutex_lock(&conn->chan_lock); |
1da177e4 | 7284 | |
3df91ea2 | 7285 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 7286 | l2cap_chan_lock(chan); |
1da177e4 | 7287 | |
89d8b407 AE |
7288 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
7289 | state_to_string(chan->state)); | |
f1cb9af5 | 7290 | |
2338a7e0 | 7291 | if (chan->scid == L2CAP_CID_A2MP) { |
78eb2f98 AE |
7292 | l2cap_chan_unlock(chan); |
7293 | continue; | |
7294 | } | |
7295 | ||
073d1cf3 | 7296 | if (chan->scid == L2CAP_CID_ATT) { |
f1cb9af5 VCG |
7297 | if (!status && encrypt) { |
7298 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 7299 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
7300 | } |
7301 | ||
6be36555 | 7302 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
7303 | continue; |
7304 | } | |
7305 | ||
96eff46e | 7306 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 7307 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
7308 | continue; |
7309 | } | |
7310 | ||
89bc500e | 7311 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 7312 | chan->state == BT_CONFIG)) { |
d97c899b | 7313 | chan->ops->resume(chan); |
4343478f | 7314 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 7315 | l2cap_chan_unlock(chan); |
9719f8af MH |
7316 | continue; |
7317 | } | |
7318 | ||
89bc500e | 7319 | if (chan->state == BT_CONNECT) { |
6d3c15da | 7320 | if (!status) |
93c3e8f5 | 7321 | l2cap_start_connection(chan); |
6d3c15da | 7322 | else |
ba13ccd9 | 7323 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
89bc500e | 7324 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 7325 | struct l2cap_conn_rsp rsp; |
df3c3931 | 7326 | __u16 res, stat; |
1da177e4 | 7327 | |
b1235d79 | 7328 | if (!status) { |
bdc25783 | 7329 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
7330 | res = L2CAP_CR_PEND; |
7331 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 7332 | chan->ops->defer(chan); |
df3c3931 | 7333 | } else { |
acdcabf5 | 7334 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
7335 | res = L2CAP_CR_SUCCESS; |
7336 | stat = L2CAP_CS_NO_INFO; | |
7337 | } | |
b1235d79 | 7338 | } else { |
acdcabf5 | 7339 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 7340 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
7341 | res = L2CAP_CR_SEC_BLOCK; |
7342 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
7343 | } |
7344 | ||
fe4128e0 GP |
7345 | rsp.scid = cpu_to_le16(chan->dcid); |
7346 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
7347 | rsp.result = cpu_to_le16(res); |
7348 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 7349 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 7350 | sizeof(rsp), &rsp); |
2d369359 MM |
7351 | |
7352 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
7353 | res == L2CAP_CR_SUCCESS) { | |
7354 | char buf[128]; | |
7355 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
7356 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
7357 | L2CAP_CONF_REQ, | |
7358 | l2cap_build_conf_req(chan, buf), | |
7359 | buf); | |
7360 | chan->num_conf_req++; | |
7361 | } | |
b1235d79 | 7362 | } |
1da177e4 | 7363 | |
6be36555 | 7364 | l2cap_chan_unlock(chan); |
1da177e4 LT |
7365 | } |
7366 | ||
3df91ea2 | 7367 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 7368 | |
1da177e4 LT |
7369 | return 0; |
7370 | } | |
7371 | ||
686ebf28 | 7372 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
7373 | { |
7374 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
7375 | struct l2cap_hdr *hdr; |
7376 | int len; | |
1da177e4 | 7377 | |
1d13a254 AE |
7378 | /* For AMP controller do not create l2cap conn */ |
7379 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
7380 | goto drop; | |
1da177e4 | 7381 | |
5a08ecce | 7382 | if (!conn) |
baf43251 | 7383 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
7384 | |
7385 | if (!conn) | |
1da177e4 LT |
7386 | goto drop; |
7387 | ||
7388 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
7389 | ||
d73a0988 AE |
7390 | switch (flags) { |
7391 | case ACL_START: | |
7392 | case ACL_START_NO_FLUSH: | |
7393 | case ACL_COMPLETE: | |
1da177e4 LT |
7394 | if (conn->rx_len) { |
7395 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
7396 | kfree_skb(conn->rx_skb); | |
7397 | conn->rx_skb = NULL; | |
7398 | conn->rx_len = 0; | |
7399 | l2cap_conn_unreliable(conn, ECOMM); | |
7400 | } | |
7401 | ||
aae7fe22 AE |
7402 | /* Start fragment always begin with Basic L2CAP header */ |
7403 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
7404 | BT_ERR("Frame is too short (len %d)", skb->len); |
7405 | l2cap_conn_unreliable(conn, ECOMM); | |
7406 | goto drop; | |
7407 | } | |
7408 | ||
7409 | hdr = (struct l2cap_hdr *) skb->data; | |
7410 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
7411 | ||
7412 | if (len == skb->len) { | |
7413 | /* Complete frame received */ | |
7414 | l2cap_recv_frame(conn, skb); | |
7415 | return 0; | |
7416 | } | |
7417 | ||
7418 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
7419 | ||
7420 | if (skb->len > len) { | |
7421 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 7422 | skb->len, len); |
1da177e4 LT |
7423 | l2cap_conn_unreliable(conn, ECOMM); |
7424 | goto drop; | |
7425 | } | |
7426 | ||
7427 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 7428 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 7429 | if (!conn->rx_skb) |
1da177e4 LT |
7430 | goto drop; |
7431 | ||
d626f62b | 7432 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7433 | skb->len); |
1da177e4 | 7434 | conn->rx_len = len - skb->len; |
d73a0988 AE |
7435 | break; |
7436 | ||
7437 | case ACL_CONT: | |
1da177e4 LT |
7438 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
7439 | ||
7440 | if (!conn->rx_len) { | |
7441 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
7442 | l2cap_conn_unreliable(conn, ECOMM); | |
7443 | goto drop; | |
7444 | } | |
7445 | ||
7446 | if (skb->len > conn->rx_len) { | |
7447 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 7448 | skb->len, conn->rx_len); |
1da177e4 LT |
7449 | kfree_skb(conn->rx_skb); |
7450 | conn->rx_skb = NULL; | |
7451 | conn->rx_len = 0; | |
7452 | l2cap_conn_unreliable(conn, ECOMM); | |
7453 | goto drop; | |
7454 | } | |
7455 | ||
d626f62b | 7456 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7457 | skb->len); |
1da177e4 LT |
7458 | conn->rx_len -= skb->len; |
7459 | ||
7460 | if (!conn->rx_len) { | |
c4e5bafa JH |
7461 | /* Complete frame received. l2cap_recv_frame |
7462 | * takes ownership of the skb so set the global | |
7463 | * rx_skb pointer to NULL first. | |
7464 | */ | |
7465 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 7466 | conn->rx_skb = NULL; |
c4e5bafa | 7467 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 7468 | } |
d73a0988 | 7469 | break; |
1da177e4 LT |
7470 | } |
7471 | ||
7472 | drop: | |
7473 | kfree_skb(skb); | |
7474 | return 0; | |
7475 | } | |
7476 | ||
aef7d97c | 7477 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 7478 | { |
23691d75 | 7479 | struct l2cap_chan *c; |
1da177e4 | 7480 | |
333055f2 | 7481 | read_lock(&chan_list_lock); |
1da177e4 | 7482 | |
23691d75 | 7483 | list_for_each_entry(c, &chan_list, global_l) { |
fcb73338 | 7484 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7eafc59e | 7485 | &c->src, &c->dst, |
fcb73338 AE |
7486 | c->state, __le16_to_cpu(c->psm), |
7487 | c->scid, c->dcid, c->imtu, c->omtu, | |
7488 | c->sec_level, c->mode); | |
61e1b4b7 | 7489 | } |
1da177e4 | 7490 | |
333055f2 | 7491 | read_unlock(&chan_list_lock); |
1da177e4 | 7492 | |
aef7d97c | 7493 | return 0; |
1da177e4 LT |
7494 | } |
7495 | ||
aef7d97c MH |
7496 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
7497 | { | |
7498 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
7499 | } | |
7500 | ||
7501 | static const struct file_operations l2cap_debugfs_fops = { | |
7502 | .open = l2cap_debugfs_open, | |
7503 | .read = seq_read, | |
7504 | .llseek = seq_lseek, | |
7505 | .release = single_release, | |
7506 | }; | |
7507 | ||
7508 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 7509 | |
64274518 | 7510 | int __init l2cap_init(void) |
1da177e4 LT |
7511 | { |
7512 | int err; | |
be9d1227 | 7513 | |
bb58f747 | 7514 | err = l2cap_init_sockets(); |
1da177e4 LT |
7515 | if (err < 0) |
7516 | return err; | |
7517 | ||
1120e4bf MH |
7518 | if (IS_ERR_OR_NULL(bt_debugfs)) |
7519 | return 0; | |
7520 | ||
7521 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
7522 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 7523 | |
40b9397a | 7524 | debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs, |
f15b8ecf | 7525 | &le_max_credits); |
40b9397a | 7526 | debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs, |
f15b8ecf JH |
7527 | &le_default_mps); |
7528 | ||
1da177e4 | 7529 | return 0; |
1da177e4 LT |
7530 | } |
7531 | ||
64274518 | 7532 | void l2cap_exit(void) |
1da177e4 | 7533 | { |
aef7d97c | 7534 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 7535 | l2cap_cleanup_sockets(); |
1da177e4 LT |
7536 | } |
7537 | ||
d1c4a17d GP |
7538 | module_param(disable_ertm, bool, 0644); |
7539 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |