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; |
a6801ca9 | 49 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS, }; |
1da177e4 | 50 | |
b5ad8b7f JB |
51 | static LIST_HEAD(chan_list); |
52 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 53 | |
f15b8ecf JH |
54 | static u16 le_max_credits = L2CAP_LE_MAX_CREDITS; |
55 | static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS; | |
56 | ||
1da177e4 | 57 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 58 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 59 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 60 | void *data); |
710f9b0a | 61 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
5e4e3972 | 62 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); |
1da177e4 | 63 | |
d660366d | 64 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2d792818 | 65 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 66 | |
4f1654e0 MH |
67 | static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type) |
68 | { | |
69 | if (hcon->type == LE_LINK) { | |
70 | if (type == ADDR_LE_DEV_PUBLIC) | |
71 | return BDADDR_LE_PUBLIC; | |
72 | else | |
73 | return BDADDR_LE_RANDOM; | |
74 | } | |
75 | ||
76 | return BDADDR_BREDR; | |
77 | } | |
78 | ||
0139418c | 79 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 80 | |
2d792818 GP |
81 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
82 | u16 cid) | |
0139418c | 83 | { |
3df91ea2 | 84 | struct l2cap_chan *c; |
3d57dc68 | 85 | |
3df91ea2 AE |
86 | list_for_each_entry(c, &conn->chan_l, list) { |
87 | if (c->dcid == cid) | |
88 | return c; | |
0139418c | 89 | } |
3df91ea2 | 90 | return NULL; |
0139418c MH |
91 | } |
92 | ||
2d792818 GP |
93 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
94 | u16 cid) | |
0139418c | 95 | { |
3df91ea2 | 96 | struct l2cap_chan *c; |
3d57dc68 | 97 | |
3df91ea2 AE |
98 | list_for_each_entry(c, &conn->chan_l, list) { |
99 | if (c->scid == cid) | |
100 | return c; | |
0139418c | 101 | } |
3df91ea2 | 102 | return NULL; |
0139418c MH |
103 | } |
104 | ||
105 | /* Find channel with given SCID. | |
ef191ade | 106 | * Returns locked channel. */ |
2d792818 GP |
107 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
108 | u16 cid) | |
0139418c | 109 | { |
48454079 | 110 | struct l2cap_chan *c; |
baa7e1fa | 111 | |
3df91ea2 | 112 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 113 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
114 | if (c) |
115 | l2cap_chan_lock(c); | |
3df91ea2 AE |
116 | mutex_unlock(&conn->chan_lock); |
117 | ||
48454079 | 118 | return c; |
0139418c MH |
119 | } |
120 | ||
b1a130b7 MM |
121 | /* Find channel with given DCID. |
122 | * Returns locked channel. | |
123 | */ | |
124 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
125 | u16 cid) | |
126 | { | |
127 | struct l2cap_chan *c; | |
128 | ||
129 | mutex_lock(&conn->chan_lock); | |
130 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
131 | if (c) | |
132 | l2cap_chan_lock(c); | |
133 | mutex_unlock(&conn->chan_lock); | |
134 | ||
135 | return c; | |
136 | } | |
137 | ||
2d792818 GP |
138 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
139 | u8 ident) | |
0139418c | 140 | { |
3df91ea2 | 141 | struct l2cap_chan *c; |
3d57dc68 | 142 | |
3df91ea2 AE |
143 | list_for_each_entry(c, &conn->chan_l, list) { |
144 | if (c->ident == ident) | |
145 | return c; | |
0139418c | 146 | } |
3df91ea2 | 147 | return NULL; |
0139418c MH |
148 | } |
149 | ||
5b155ef9 MM |
150 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
151 | u8 ident) | |
152 | { | |
153 | struct l2cap_chan *c; | |
154 | ||
155 | mutex_lock(&conn->chan_lock); | |
156 | c = __l2cap_get_chan_by_ident(conn, ident); | |
157 | if (c) | |
158 | l2cap_chan_lock(c); | |
159 | mutex_unlock(&conn->chan_lock); | |
160 | ||
161 | return c; | |
162 | } | |
163 | ||
23691d75 | 164 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 165 | { |
23691d75 | 166 | struct l2cap_chan *c; |
9e4425ff | 167 | |
23691d75 | 168 | list_for_each_entry(c, &chan_list, global_l) { |
7eafc59e | 169 | if (c->sport == psm && !bacmp(&c->src, src)) |
250938cb | 170 | return c; |
9e4425ff | 171 | } |
250938cb | 172 | return NULL; |
9e4425ff GP |
173 | } |
174 | ||
175 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
176 | { | |
73b2ec18 GP |
177 | int err; |
178 | ||
333055f2 | 179 | write_lock(&chan_list_lock); |
9e4425ff | 180 | |
23691d75 | 181 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
182 | err = -EADDRINUSE; |
183 | goto done; | |
9e4425ff GP |
184 | } |
185 | ||
73b2ec18 GP |
186 | if (psm) { |
187 | chan->psm = psm; | |
188 | chan->sport = psm; | |
189 | err = 0; | |
190 | } else { | |
191 | u16 p; | |
192 | ||
193 | err = -EINVAL; | |
194 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 195 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
196 | chan->psm = cpu_to_le16(p); |
197 | chan->sport = cpu_to_le16(p); | |
198 | err = 0; | |
199 | break; | |
200 | } | |
201 | } | |
9e4425ff | 202 | |
73b2ec18 | 203 | done: |
333055f2 | 204 | write_unlock(&chan_list_lock); |
73b2ec18 | 205 | return err; |
9e4425ff | 206 | } |
6b8d4a6a | 207 | EXPORT_SYMBOL_GPL(l2cap_add_psm); |
9e4425ff GP |
208 | |
209 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
210 | { | |
333055f2 | 211 | write_lock(&chan_list_lock); |
9e4425ff 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 */ | |
e7cafc45 | 778 | int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator) |
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 | |
e7cafc45 JH |
788 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type, |
789 | initiator); | |
79d554a6 MH |
790 | } |
791 | ||
b5ad8b7f | 792 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
793 | { |
794 | u8 id; | |
795 | ||
796 | /* Get next available identificator. | |
797 | * 1 - 128 are used by kernel. | |
798 | * 129 - 199 are reserved. | |
799 | * 200 - 254 are used by utilities like l2ping, etc. | |
800 | */ | |
801 | ||
5a54e7c8 | 802 | mutex_lock(&conn->ident_lock); |
4e8402a3 MH |
803 | |
804 | if (++conn->tx_ident > 128) | |
805 | conn->tx_ident = 1; | |
806 | ||
807 | id = conn->tx_ident; | |
808 | ||
5a54e7c8 | 809 | mutex_unlock(&conn->ident_lock); |
4e8402a3 MH |
810 | |
811 | return id; | |
812 | } | |
813 | ||
2d792818 GP |
814 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
815 | void *data) | |
4e8402a3 MH |
816 | { |
817 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 818 | u8 flags; |
4e8402a3 MH |
819 | |
820 | BT_DBG("code 0x%2.2x", code); | |
821 | ||
822 | if (!skb) | |
9a9c6a34 | 823 | return; |
4e8402a3 | 824 | |
e702112f AE |
825 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
826 | flags = ACL_START_NO_FLUSH; | |
827 | else | |
828 | flags = ACL_START; | |
829 | ||
14b12d0b | 830 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 831 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 832 | |
73d80deb LAD |
833 | hci_send_acl(conn->hchan, skb, flags); |
834 | } | |
835 | ||
02b0fbb9 MM |
836 | static bool __chan_is_moving(struct l2cap_chan *chan) |
837 | { | |
838 | return chan->move_state != L2CAP_MOVE_STABLE && | |
839 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
840 | } | |
841 | ||
73d80deb LAD |
842 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
843 | { | |
844 | struct hci_conn *hcon = chan->conn->hcon; | |
845 | u16 flags; | |
846 | ||
847 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 848 | skb->priority); |
73d80deb | 849 | |
d5f8a75d MM |
850 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
851 | if (chan->hs_hchan) | |
852 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
853 | else | |
854 | kfree_skb(skb); | |
855 | ||
856 | return; | |
857 | } | |
858 | ||
73d80deb | 859 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
2d792818 | 860 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
861 | flags = ACL_START_NO_FLUSH; |
862 | else | |
863 | flags = ACL_START; | |
14b12d0b | 864 | |
73d80deb LAD |
865 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
866 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
867 | } |
868 | ||
b76bbd66 MM |
869 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
870 | { | |
871 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
872 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
873 | ||
874 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
875 | /* S-Frame */ | |
876 | control->sframe = 1; | |
877 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
878 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
879 | ||
880 | control->sar = 0; | |
881 | control->txseq = 0; | |
882 | } else { | |
883 | /* I-Frame */ | |
884 | control->sframe = 0; | |
885 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
886 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
887 | ||
888 | control->poll = 0; | |
889 | control->super = 0; | |
890 | } | |
891 | } | |
892 | ||
b76bbd66 MM |
893 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
894 | { | |
895 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
896 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
897 | ||
898 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
899 | /* S-Frame */ | |
900 | control->sframe = 1; | |
901 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
902 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
903 | ||
904 | control->sar = 0; | |
905 | control->txseq = 0; | |
906 | } else { | |
907 | /* I-Frame */ | |
908 | control->sframe = 0; | |
909 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
910 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
911 | ||
912 | control->poll = 0; | |
913 | control->super = 0; | |
914 | } | |
915 | } | |
916 | ||
917 | static inline void __unpack_control(struct l2cap_chan *chan, | |
918 | struct sk_buff *skb) | |
919 | { | |
920 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
921 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
922 | &bt_cb(skb)->control); | |
cec8ab6e | 923 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
924 | } else { |
925 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
926 | &bt_cb(skb)->control); | |
cec8ab6e | 927 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
928 | } |
929 | } | |
930 | ||
b5c6aaed MM |
931 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
932 | { | |
933 | u32 packed; | |
934 | ||
935 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
936 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
937 | ||
938 | if (control->sframe) { | |
939 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
940 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
941 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
942 | } else { | |
943 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
944 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
945 | } | |
946 | ||
947 | return packed; | |
948 | } | |
949 | ||
950 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
951 | { | |
952 | u16 packed; | |
953 | ||
954 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
955 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
956 | ||
957 | if (control->sframe) { | |
958 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
959 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
960 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
961 | } else { | |
962 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
963 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
964 | } | |
965 | ||
966 | return packed; | |
967 | } | |
968 | ||
b76bbd66 MM |
969 | static inline void __pack_control(struct l2cap_chan *chan, |
970 | struct l2cap_ctrl *control, | |
971 | struct sk_buff *skb) | |
972 | { | |
973 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
974 | put_unaligned_le32(__pack_extended_control(control), | |
975 | skb->data + L2CAP_HDR_SIZE); | |
976 | } else { | |
977 | put_unaligned_le16(__pack_enhanced_control(control), | |
978 | skb->data + L2CAP_HDR_SIZE); | |
979 | } | |
980 | } | |
981 | ||
ba7aa64f GP |
982 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
983 | { | |
984 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
985 | return L2CAP_EXT_HDR_SIZE; | |
986 | else | |
987 | return L2CAP_ENH_HDR_SIZE; | |
988 | } | |
989 | ||
a67d7f6f MM |
990 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
991 | u32 control) | |
b5c6aaed MM |
992 | { |
993 | struct sk_buff *skb; | |
994 | struct l2cap_hdr *lh; | |
ba7aa64f | 995 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
996 | |
997 | if (chan->fcs == L2CAP_FCS_CRC16) | |
998 | hlen += L2CAP_FCS_SIZE; | |
999 | ||
a67d7f6f | 1000 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 1001 | |
b5c6aaed | 1002 | if (!skb) |
a67d7f6f | 1003 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
1004 | |
1005 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1006 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
1007 | lh->cid = cpu_to_le16(chan->dcid); | |
1008 | ||
a67d7f6f MM |
1009 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1010 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
1011 | else | |
1012 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
1013 | |
1014 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 1015 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
1016 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
1017 | } | |
1018 | ||
1019 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
1020 | return skb; |
1021 | } | |
1022 | ||
1023 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
1024 | struct l2cap_ctrl *control) | |
1025 | { | |
1026 | struct sk_buff *skb; | |
1027 | u32 control_field; | |
1028 | ||
1029 | BT_DBG("chan %p, control %p", chan, control); | |
1030 | ||
1031 | if (!control->sframe) | |
1032 | return; | |
1033 | ||
b99e13ad MM |
1034 | if (__chan_is_moving(chan)) |
1035 | return; | |
1036 | ||
a67d7f6f MM |
1037 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
1038 | !control->poll) | |
1039 | control->final = 1; | |
1040 | ||
1041 | if (control->super == L2CAP_SUPER_RR) | |
1042 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
1043 | else if (control->super == L2CAP_SUPER_RNR) | |
1044 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
1045 | ||
1046 | if (control->super != L2CAP_SUPER_SREJ) { | |
1047 | chan->last_acked_seq = control->reqseq; | |
1048 | __clear_ack_timer(chan); | |
1049 | } | |
1050 | ||
1051 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
1052 | control->final, control->poll, control->super); | |
1053 | ||
1054 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1055 | control_field = __pack_extended_control(control); | |
1056 | else | |
1057 | control_field = __pack_enhanced_control(control); | |
1058 | ||
1059 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
1060 | if (!IS_ERR(skb)) | |
1061 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
1062 | } |
1063 | ||
c9e3d5e0 | 1064 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 1065 | { |
c9e3d5e0 MM |
1066 | struct l2cap_ctrl control; |
1067 | ||
1068 | BT_DBG("chan %p, poll %d", chan, poll); | |
1069 | ||
1070 | memset(&control, 0, sizeof(control)); | |
1071 | control.sframe = 1; | |
1072 | control.poll = poll; | |
1073 | ||
1074 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
1075 | control.super = L2CAP_SUPER_RNR; | |
1076 | else | |
1077 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1078 | |
c9e3d5e0 MM |
1079 | control.reqseq = chan->buffer_seq; |
1080 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1081 | } |
1082 | ||
b4450035 | 1083 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1084 | { |
5ff6f34d JH |
1085 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
1086 | return true; | |
1087 | ||
c1360a1c | 1088 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1089 | } |
1090 | ||
1df7b17a | 1091 | static bool __amp_capable(struct l2cap_chan *chan) |
80d58d0b | 1092 | { |
1df7b17a | 1093 | struct l2cap_conn *conn = chan->conn; |
80d58d0b | 1094 | struct hci_dev *hdev; |
1df7b17a MH |
1095 | bool amp_available = false; |
1096 | ||
1097 | if (!conn->hs_enabled) | |
1098 | return false; | |
1099 | ||
1100 | if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP)) | |
1101 | return false; | |
80d58d0b MH |
1102 | |
1103 | read_lock(&hci_dev_list_lock); | |
1df7b17a | 1104 | list_for_each_entry(hdev, &hci_dev_list, list) { |
80d58d0b | 1105 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1df7b17a MH |
1106 | test_bit(HCI_UP, &hdev->flags)) { |
1107 | amp_available = true; | |
1108 | break; | |
1109 | } | |
1110 | } | |
80d58d0b MH |
1111 | read_unlock(&hci_dev_list_lock); |
1112 | ||
1df7b17a MH |
1113 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1114 | return amp_available; | |
848566b3 MH |
1115 | |
1116 | return false; | |
93c3e8f5 AE |
1117 | } |
1118 | ||
5ce66b59 AE |
1119 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1120 | { | |
1121 | /* Check EFS parameters */ | |
1122 | return true; | |
1123 | } | |
1124 | ||
2766be48 | 1125 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1126 | { |
1127 | struct l2cap_conn *conn = chan->conn; | |
1128 | struct l2cap_conn_req req; | |
1129 | ||
1130 | req.scid = cpu_to_le16(chan->scid); | |
1131 | req.psm = chan->psm; | |
1132 | ||
1133 | chan->ident = l2cap_get_ident(conn); | |
1134 | ||
1135 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1136 | ||
1137 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1138 | } | |
1139 | ||
8eb200bd MM |
1140 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1141 | { | |
1142 | struct l2cap_create_chan_req req; | |
1143 | req.scid = cpu_to_le16(chan->scid); | |
1144 | req.psm = chan->psm; | |
1145 | req.amp_id = amp_id; | |
1146 | ||
1147 | chan->ident = l2cap_get_ident(chan->conn); | |
1148 | ||
1149 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1150 | sizeof(req), &req); | |
1151 | } | |
1152 | ||
02b0fbb9 MM |
1153 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1154 | { | |
1155 | struct sk_buff *skb; | |
1156 | ||
1157 | BT_DBG("chan %p", chan); | |
1158 | ||
1159 | if (chan->mode != L2CAP_MODE_ERTM) | |
1160 | return; | |
1161 | ||
1162 | __clear_retrans_timer(chan); | |
1163 | __clear_monitor_timer(chan); | |
1164 | __clear_ack_timer(chan); | |
1165 | ||
1166 | chan->retry_count = 0; | |
1167 | skb_queue_walk(&chan->tx_q, skb) { | |
1168 | if (bt_cb(skb)->control.retries) | |
1169 | bt_cb(skb)->control.retries = 1; | |
1170 | else | |
1171 | break; | |
1172 | } | |
1173 | ||
1174 | chan->expected_tx_seq = chan->buffer_seq; | |
1175 | ||
1176 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1177 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1178 | l2cap_seq_list_clear(&chan->retrans_list); | |
1179 | l2cap_seq_list_clear(&chan->srej_list); | |
1180 | skb_queue_purge(&chan->srej_q); | |
1181 | ||
1182 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1183 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1184 | ||
1185 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1186 | } | |
1187 | ||
5f3847a4 MM |
1188 | static void l2cap_move_done(struct l2cap_chan *chan) |
1189 | { | |
1190 | u8 move_role = chan->move_role; | |
1191 | BT_DBG("chan %p", chan); | |
1192 | ||
1193 | chan->move_state = L2CAP_MOVE_STABLE; | |
1194 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1195 | ||
1196 | if (chan->mode != L2CAP_MODE_ERTM) | |
1197 | return; | |
1198 | ||
1199 | switch (move_role) { | |
1200 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1201 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1202 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1203 | break; | |
1204 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1205 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1206 | break; | |
1207 | } | |
1208 | } | |
1209 | ||
9f0caeb1 VCG |
1210 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1211 | { | |
2827011f | 1212 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1213 | chan->conf_state = 0; |
1214 | __clear_chan_timer(chan); | |
1215 | ||
0ce43ce6 JH |
1216 | if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) |
1217 | chan->ops->suspend(chan); | |
177f8f2b | 1218 | |
54a59aa2 | 1219 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1220 | |
fd83e2c2 | 1221 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1222 | } |
1223 | ||
f1496dee JH |
1224 | static void l2cap_le_connect(struct l2cap_chan *chan) |
1225 | { | |
1226 | struct l2cap_conn *conn = chan->conn; | |
1227 | struct l2cap_le_conn_req req; | |
1228 | ||
595177f3 JH |
1229 | if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags)) |
1230 | return; | |
1231 | ||
f1496dee JH |
1232 | req.psm = chan->psm; |
1233 | req.scid = cpu_to_le16(chan->scid); | |
1234 | req.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 1235 | req.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 1236 | req.credits = cpu_to_le16(chan->rx_credits); |
f1496dee JH |
1237 | |
1238 | chan->ident = l2cap_get_ident(conn); | |
1239 | ||
1240 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, | |
1241 | sizeof(req), &req); | |
1242 | } | |
1243 | ||
1244 | static void l2cap_le_start(struct l2cap_chan *chan) | |
1245 | { | |
1246 | struct l2cap_conn *conn = chan->conn; | |
1247 | ||
1248 | if (!smp_conn_security(conn->hcon, chan->sec_level)) | |
1249 | return; | |
1250 | ||
1251 | if (!chan->psm) { | |
1252 | l2cap_chan_ready(chan); | |
1253 | return; | |
1254 | } | |
1255 | ||
1256 | if (chan->state == BT_CONNECT) | |
1257 | l2cap_le_connect(chan); | |
1258 | } | |
1259 | ||
93c3e8f5 AE |
1260 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1261 | { | |
1262 | if (__amp_capable(chan)) { | |
1263 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1264 | a2mp_discover_amp(chan); | |
f1496dee JH |
1265 | } else if (chan->conn->hcon->type == LE_LINK) { |
1266 | l2cap_le_start(chan); | |
93c3e8f5 AE |
1267 | } else { |
1268 | l2cap_send_conn_req(chan); | |
1269 | } | |
1270 | } | |
1271 | ||
fc7f8a7e | 1272 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1273 | { |
8c1d787b | 1274 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1275 | |
9f0caeb1 | 1276 | if (conn->hcon->type == LE_LINK) { |
96ac34fb | 1277 | l2cap_le_start(chan); |
9f0caeb1 VCG |
1278 | return; |
1279 | } | |
1280 | ||
79d554a6 | 1281 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1282 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1283 | return; | |
1284 | ||
e7cafc45 | 1285 | if (l2cap_chan_check_security(chan, true) && |
2d792818 | 1286 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1287 | l2cap_start_connection(chan); |
1288 | } | |
79d554a6 MH |
1289 | } else { |
1290 | struct l2cap_info_req req; | |
dcf4adbf | 1291 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1292 | |
1293 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1294 | conn->info_ident = l2cap_get_ident(conn); | |
1295 | ||
ba13ccd9 | 1296 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1297 | |
2d792818 GP |
1298 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1299 | sizeof(req), &req); | |
79d554a6 MH |
1300 | } |
1301 | } | |
1302 | ||
cf6c2c0b GP |
1303 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1304 | { | |
1305 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1306 | if (!disable_ertm) |
cf6c2c0b GP |
1307 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1308 | ||
1309 | switch (mode) { | |
1310 | case L2CAP_MODE_ERTM: | |
1311 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1312 | case L2CAP_MODE_STREAMING: | |
1313 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1314 | default: | |
1315 | return 0x00; | |
1316 | } | |
1317 | } | |
1318 | ||
5e4e3972 | 1319 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1320 | { |
5e4e3972 | 1321 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1322 | struct l2cap_disconn_req req; |
1323 | ||
c13ffa62 GP |
1324 | if (!conn) |
1325 | return; | |
1326 | ||
aad3d0e3 | 1327 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1328 | __clear_retrans_timer(chan); |
1329 | __clear_monitor_timer(chan); | |
1330 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1331 | } |
1332 | ||
2338a7e0 | 1333 | if (chan->scid == L2CAP_CID_A2MP) { |
d117773c | 1334 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1335 | return; |
1336 | } | |
1337 | ||
fe4128e0 GP |
1338 | req.dcid = cpu_to_le16(chan->dcid); |
1339 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1340 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1341 | sizeof(req), &req); | |
c13ffa62 | 1342 | |
f8e73017 | 1343 | l2cap_state_change_and_error(chan, BT_DISCONN, err); |
22121fc9 GP |
1344 | } |
1345 | ||
1da177e4 | 1346 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1347 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1348 | { | |
3df91ea2 | 1349 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1350 | |
1351 | BT_DBG("conn %p", conn); | |
1352 | ||
3df91ea2 | 1353 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1354 | |
3df91ea2 | 1355 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6be36555 | 1356 | l2cap_chan_lock(chan); |
4e8402a3 | 1357 | |
715ec005 | 1358 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1359 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1360 | continue; |
1361 | } | |
1362 | ||
89bc500e | 1363 | if (chan->state == BT_CONNECT) { |
e7cafc45 | 1364 | if (!l2cap_chan_check_security(chan, true) || |
2d792818 | 1365 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1366 | l2cap_chan_unlock(chan); |
47731de7 GP |
1367 | continue; |
1368 | } | |
79d554a6 | 1369 | |
c1360a1c | 1370 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1371 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1372 | &chan->conf_state)) { |
89bc500e | 1373 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1374 | l2cap_chan_unlock(chan); |
47731de7 | 1375 | continue; |
b1235d79 | 1376 | } |
47731de7 | 1377 | |
93c3e8f5 | 1378 | l2cap_start_connection(chan); |
47731de7 | 1379 | |
89bc500e | 1380 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1381 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1382 | char buf[128]; |
fe4128e0 GP |
1383 | rsp.scid = cpu_to_le16(chan->dcid); |
1384 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1385 | |
e7cafc45 | 1386 | if (l2cap_chan_check_security(chan, false)) { |
bdc25783 | 1387 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
dcf4adbf JP |
1388 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1389 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1390 | chan->ops->defer(chan); |
f66dc81f MH |
1391 | |
1392 | } else { | |
acdcabf5 | 1393 | l2cap_state_change(chan, BT_CONFIG); |
dcf4adbf JP |
1394 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1395 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1396 | } |
79d554a6 | 1397 | } else { |
dcf4adbf JP |
1398 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1399 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1400 | } |
1401 | ||
fc7f8a7e | 1402 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1403 | sizeof(rsp), &rsp); |
e9aeb2dd | 1404 | |
c1360a1c | 1405 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1406 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1407 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1408 | continue; |
1409 | } | |
1410 | ||
c1360a1c | 1411 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1412 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1413 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1414 | chan->num_conf_req++; |
4e8402a3 MH |
1415 | } |
1416 | ||
6be36555 | 1417 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1418 | } |
1419 | ||
3df91ea2 | 1420 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1421 | } |
1422 | ||
c2287681 | 1423 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1424 | * Returns closest match, locked. |
1425 | */ | |
d9b88702 | 1426 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1427 | bdaddr_t *src, |
1428 | bdaddr_t *dst) | |
b62f328b | 1429 | { |
23691d75 | 1430 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1431 | |
23691d75 | 1432 | read_lock(&chan_list_lock); |
b62f328b | 1433 | |
23691d75 | 1434 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1435 | if (state && c->state != state) |
b62f328b VT |
1436 | continue; |
1437 | ||
23691d75 | 1438 | if (c->scid == cid) { |
c2287681 IY |
1439 | int src_match, dst_match; |
1440 | int src_any, dst_any; | |
1441 | ||
b62f328b | 1442 | /* Exact match. */ |
7eafc59e MH |
1443 | src_match = !bacmp(&c->src, src); |
1444 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1445 | if (src_match && dst_match) { |
a24cce14 | 1446 | l2cap_chan_hold(c); |
23691d75 GP |
1447 | read_unlock(&chan_list_lock); |
1448 | return c; | |
1449 | } | |
b62f328b VT |
1450 | |
1451 | /* Closest match */ | |
7eafc59e MH |
1452 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1453 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1454 | if ((src_match && dst_any) || (src_any && dst_match) || |
1455 | (src_any && dst_any)) | |
23691d75 | 1456 | c1 = c; |
b62f328b VT |
1457 | } |
1458 | } | |
280f294f | 1459 | |
a24cce14 JH |
1460 | if (c1) |
1461 | l2cap_chan_hold(c1); | |
1462 | ||
23691d75 | 1463 | read_unlock(&chan_list_lock); |
b62f328b | 1464 | |
23691d75 | 1465 | return c1; |
b62f328b VT |
1466 | } |
1467 | ||
1468 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1469 | { | |
cc8dba2b | 1470 | struct hci_conn *hcon = conn->hcon; |
dcc36c16 | 1471 | struct hci_dev *hdev = hcon->hdev; |
23691d75 | 1472 | struct l2cap_chan *chan, *pchan; |
cc8dba2b | 1473 | u8 dst_type; |
b62f328b VT |
1474 | |
1475 | BT_DBG(""); | |
1476 | ||
1477 | /* Check if we have socket listening on cid */ | |
073d1cf3 | 1478 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT, |
cc8dba2b | 1479 | &hcon->src, &hcon->dst); |
23691d75 | 1480 | if (!pchan) |
b62f328b VT |
1481 | return; |
1482 | ||
44f3b0fb JH |
1483 | /* Client ATT sockets should override the server one */ |
1484 | if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT)) | |
a24cce14 | 1485 | goto put; |
44f3b0fb | 1486 | |
cc8dba2b MH |
1487 | dst_type = bdaddr_type(hcon, hcon->dst_type); |
1488 | ||
1489 | /* If device is blocked, do not create a channel for it */ | |
dcc36c16 | 1490 | if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type)) |
a24cce14 | 1491 | goto put; |
cc8dba2b | 1492 | |
80afeb6c MH |
1493 | /* For LE slave connections, make sure the connection interval |
1494 | * is in the range of the minium and maximum interval that has | |
1495 | * been configured for this connection. If not, then trigger | |
1496 | * the connection update procedure. | |
1497 | */ | |
40bef302 | 1498 | if (hcon->role == HCI_ROLE_SLAVE && |
80afeb6c MH |
1499 | (hcon->le_conn_interval < hcon->le_conn_min_interval || |
1500 | hcon->le_conn_interval > hcon->le_conn_max_interval)) { | |
1501 | struct l2cap_conn_param_update_req req; | |
1502 | ||
1503 | req.min = cpu_to_le16(hcon->le_conn_min_interval); | |
1504 | req.max = cpu_to_le16(hcon->le_conn_max_interval); | |
1505 | req.latency = cpu_to_le16(hcon->le_conn_latency); | |
1506 | req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout); | |
1507 | ||
1508 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
1509 | L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req); | |
1510 | } | |
1511 | ||
8ffb9290 | 1512 | l2cap_chan_lock(pchan); |
62f3a2cf | 1513 | |
80b98027 | 1514 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1515 | if (!chan) |
b62f328b VT |
1516 | goto clean; |
1517 | ||
cc8dba2b MH |
1518 | bacpy(&chan->src, &hcon->src); |
1519 | bacpy(&chan->dst, &hcon->dst); | |
1520 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
1521 | chan->dst_type = dst_type; | |
b62f328b | 1522 | |
44f3b0fb | 1523 | __l2cap_chan_add(conn, chan); |
48454079 | 1524 | |
b62f328b | 1525 | clean: |
8ffb9290 | 1526 | l2cap_chan_unlock(pchan); |
a24cce14 JH |
1527 | put: |
1528 | l2cap_chan_put(pchan); | |
b62f328b VT |
1529 | } |
1530 | ||
4e8402a3 MH |
1531 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1532 | { | |
48454079 | 1533 | struct l2cap_chan *chan; |
cc110922 | 1534 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1535 | |
79d554a6 | 1536 | BT_DBG("conn %p", conn); |
4e8402a3 | 1537 | |
d8729922 JH |
1538 | /* For outgoing pairing which doesn't necessarily have an |
1539 | * associated socket (e.g. mgmt_pair_device). | |
1540 | */ | |
cc110922 VCG |
1541 | if (hcon->out && hcon->type == LE_LINK) |
1542 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1543 | |
3df91ea2 | 1544 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1545 | |
44f3b0fb JH |
1546 | if (hcon->type == LE_LINK) |
1547 | l2cap_le_conn_ready(conn); | |
1548 | ||
3df91ea2 | 1549 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1550 | |
6be36555 | 1551 | l2cap_chan_lock(chan); |
4e8402a3 | 1552 | |
2338a7e0 | 1553 | if (chan->scid == L2CAP_CID_A2MP) { |
416fa752 AE |
1554 | l2cap_chan_unlock(chan); |
1555 | continue; | |
1556 | } | |
1557 | ||
cc110922 | 1558 | if (hcon->type == LE_LINK) { |
f1496dee | 1559 | l2cap_le_start(chan); |
63128451 | 1560 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
74e75740 | 1561 | l2cap_chan_ready(chan); |
b501d6a1 | 1562 | |
1c244f79 | 1563 | } else if (chan->state == BT_CONNECT) { |
fc7f8a7e | 1564 | l2cap_do_start(chan); |
1c244f79 | 1565 | } |
4e8402a3 | 1566 | |
6be36555 | 1567 | l2cap_chan_unlock(chan); |
4e8402a3 | 1568 | } |
79d554a6 | 1569 | |
3df91ea2 | 1570 | mutex_unlock(&conn->chan_lock); |
61a939c6 JH |
1571 | |
1572 | queue_work(hcon->hdev->workqueue, &conn->pending_rx_work); | |
4e8402a3 MH |
1573 | } |
1574 | ||
1575 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1576 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1577 | { | |
48454079 | 1578 | struct l2cap_chan *chan; |
4e8402a3 MH |
1579 | |
1580 | BT_DBG("conn %p", conn); | |
1581 | ||
3df91ea2 | 1582 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1583 | |
3df91ea2 | 1584 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1585 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1586 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1587 | } |
1588 | ||
3df91ea2 | 1589 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1590 | } |
1591 | ||
f878fcad | 1592 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1593 | { |
f878fcad | 1594 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1595 | info_timer.work); |
4e8402a3 | 1596 | |
984947dc | 1597 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1598 | conn->info_ident = 0; |
984947dc | 1599 | |
4e8402a3 MH |
1600 | l2cap_conn_start(conn); |
1601 | } | |
1602 | ||
2c8e1411 DH |
1603 | /* |
1604 | * l2cap_user | |
1605 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1606 | * callback is called during registration. The ->remove callback is called | |
1607 | * during unregistration. | |
1608 | * An l2cap_user object can either be explicitly unregistered or when the | |
1609 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1610 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1611 | * External modules must own a reference to the l2cap_conn object if they intend | |
1612 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1613 | * any time if they don't. | |
1614 | */ | |
1615 | ||
1616 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1617 | { | |
1618 | struct hci_dev *hdev = conn->hcon->hdev; | |
1619 | int ret; | |
1620 | ||
1621 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1622 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1623 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1624 | * relies on the parent hci_conn object to be locked. This itself relies | |
1625 | * on the hci_dev object to be locked. So we must lock the hci device | |
1626 | * here, too. */ | |
1627 | ||
1628 | hci_dev_lock(hdev); | |
1629 | ||
1630 | if (user->list.next || user->list.prev) { | |
1631 | ret = -EINVAL; | |
1632 | goto out_unlock; | |
1633 | } | |
1634 | ||
1635 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1636 | if (!conn->hchan) { | |
1637 | ret = -ENODEV; | |
1638 | goto out_unlock; | |
1639 | } | |
1640 | ||
1641 | ret = user->probe(conn, user); | |
1642 | if (ret) | |
1643 | goto out_unlock; | |
1644 | ||
1645 | list_add(&user->list, &conn->users); | |
1646 | ret = 0; | |
1647 | ||
1648 | out_unlock: | |
1649 | hci_dev_unlock(hdev); | |
1650 | return ret; | |
1651 | } | |
1652 | EXPORT_SYMBOL(l2cap_register_user); | |
1653 | ||
1654 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1655 | { | |
1656 | struct hci_dev *hdev = conn->hcon->hdev; | |
1657 | ||
1658 | hci_dev_lock(hdev); | |
1659 | ||
1660 | if (!user->list.next || !user->list.prev) | |
1661 | goto out_unlock; | |
1662 | ||
1663 | list_del(&user->list); | |
1664 | user->list.next = NULL; | |
1665 | user->list.prev = NULL; | |
1666 | user->remove(conn, user); | |
1667 | ||
1668 | out_unlock: | |
1669 | hci_dev_unlock(hdev); | |
1670 | } | |
1671 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1672 | ||
1673 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1674 | { | |
1675 | struct l2cap_user *user; | |
1676 | ||
1677 | while (!list_empty(&conn->users)) { | |
1678 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1679 | list_del(&user->list); | |
1680 | user->list.next = NULL; | |
1681 | user->list.prev = NULL; | |
1682 | user->remove(conn, user); | |
1683 | } | |
1684 | } | |
1685 | ||
5d3de7df VCG |
1686 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1687 | { | |
1688 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1689 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1690 | |
1691 | if (!conn) | |
1692 | return; | |
1693 | ||
1694 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1695 | ||
1696 | kfree_skb(conn->rx_skb); | |
1697 | ||
61a939c6 | 1698 | skb_queue_purge(&conn->pending_rx); |
7ab56c3a JT |
1699 | |
1700 | /* We can not call flush_work(&conn->pending_rx_work) here since we | |
1701 | * might block if we are running on a worker from the same workqueue | |
1702 | * pending_rx_work is waiting on. | |
1703 | */ | |
1704 | if (work_pending(&conn->pending_rx_work)) | |
1705 | cancel_work_sync(&conn->pending_rx_work); | |
61a939c6 | 1706 | |
2c8e1411 DH |
1707 | l2cap_unregister_all_users(conn); |
1708 | ||
3df91ea2 AE |
1709 | mutex_lock(&conn->chan_lock); |
1710 | ||
5d3de7df VCG |
1711 | /* Kill channels */ |
1712 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1713 | l2cap_chan_hold(chan); |
6be36555 AE |
1714 | l2cap_chan_lock(chan); |
1715 | ||
5d3de7df | 1716 | l2cap_chan_del(chan, err); |
6be36555 AE |
1717 | |
1718 | l2cap_chan_unlock(chan); | |
1719 | ||
80b98027 | 1720 | chan->ops->close(chan); |
61d6ef3e | 1721 | l2cap_chan_put(chan); |
5d3de7df VCG |
1722 | } |
1723 | ||
3df91ea2 AE |
1724 | mutex_unlock(&conn->chan_lock); |
1725 | ||
73d80deb LAD |
1726 | hci_chan_del(conn->hchan); |
1727 | ||
5d3de7df | 1728 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1729 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1730 | |
51a8efd7 | 1731 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1732 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1733 | smp_chan_destroy(conn); |
d26a2345 | 1734 | } |
5d3de7df VCG |
1735 | |
1736 | hcon->l2cap_data = NULL; | |
9c903e37 DH |
1737 | conn->hchan = NULL; |
1738 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1739 | } |
1740 | ||
6c9d42a1 | 1741 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1742 | { |
6c9d42a1 | 1743 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1744 | security_timer.work); |
5d3de7df | 1745 | |
d06cc416 JH |
1746 | BT_DBG("conn %p", conn); |
1747 | ||
1748 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1749 | smp_chan_destroy(conn); | |
1750 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1751 | } | |
5d3de7df VCG |
1752 | } |
1753 | ||
9c903e37 DH |
1754 | static void l2cap_conn_free(struct kref *ref) |
1755 | { | |
1756 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1757 | ||
1758 | hci_conn_put(conn->hcon); | |
1759 | kfree(conn); | |
1760 | } | |
1761 | ||
1762 | void l2cap_conn_get(struct l2cap_conn *conn) | |
1763 | { | |
1764 | kref_get(&conn->ref); | |
1765 | } | |
1766 | EXPORT_SYMBOL(l2cap_conn_get); | |
1767 | ||
1768 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1769 | { | |
1770 | kref_put(&conn->ref, l2cap_conn_free); | |
1771 | } | |
1772 | EXPORT_SYMBOL(l2cap_conn_put); | |
1773 | ||
1da177e4 | 1774 | /* ---- Socket interface ---- */ |
1da177e4 | 1775 | |
c2287681 | 1776 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1777 | * Returns closest match. |
1778 | */ | |
c2287681 IY |
1779 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1780 | bdaddr_t *src, | |
bf20fd4e JH |
1781 | bdaddr_t *dst, |
1782 | u8 link_type) | |
1da177e4 | 1783 | { |
23691d75 | 1784 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1785 | |
23691d75 | 1786 | read_lock(&chan_list_lock); |
e0f0cb56 | 1787 | |
23691d75 | 1788 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1789 | if (state && c->state != state) |
1da177e4 LT |
1790 | continue; |
1791 | ||
bf20fd4e JH |
1792 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1793 | continue; | |
1794 | ||
1795 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
1796 | continue; | |
1797 | ||
23691d75 | 1798 | if (c->psm == psm) { |
c2287681 IY |
1799 | int src_match, dst_match; |
1800 | int src_any, dst_any; | |
1801 | ||
1da177e4 | 1802 | /* Exact match. */ |
7eafc59e MH |
1803 | src_match = !bacmp(&c->src, src); |
1804 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1805 | if (src_match && dst_match) { |
a24cce14 | 1806 | l2cap_chan_hold(c); |
a7567b20 | 1807 | read_unlock(&chan_list_lock); |
23691d75 GP |
1808 | return c; |
1809 | } | |
1da177e4 LT |
1810 | |
1811 | /* Closest match */ | |
7eafc59e MH |
1812 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1813 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1814 | if ((src_match && dst_any) || (src_any && dst_match) || |
1815 | (src_any && dst_any)) | |
23691d75 | 1816 | c1 = c; |
1da177e4 LT |
1817 | } |
1818 | } | |
1da177e4 | 1819 | |
a24cce14 JH |
1820 | if (c1) |
1821 | l2cap_chan_hold(c1); | |
1822 | ||
23691d75 | 1823 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1824 | |
23691d75 | 1825 | return c1; |
1da177e4 LT |
1826 | } |
1827 | ||
721c4181 | 1828 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1829 | { |
721c4181 | 1830 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1831 | monitor_timer.work); |
e90bac06 | 1832 | |
525cd185 | 1833 | BT_DBG("chan %p", chan); |
0e98958d | 1834 | |
6be36555 AE |
1835 | l2cap_chan_lock(chan); |
1836 | ||
80909e04 | 1837 | if (!chan->conn) { |
6be36555 | 1838 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1839 | l2cap_chan_put(chan); |
e90bac06 GP |
1840 | return; |
1841 | } | |
1842 | ||
401bb1f7 | 1843 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1844 | |
6be36555 | 1845 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1846 | l2cap_chan_put(chan); |
e90bac06 GP |
1847 | } |
1848 | ||
721c4181 | 1849 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1850 | { |
721c4181 | 1851 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1852 | retrans_timer.work); |
e90bac06 | 1853 | |
49208c9c | 1854 | BT_DBG("chan %p", chan); |
0e98958d | 1855 | |
6be36555 AE |
1856 | l2cap_chan_lock(chan); |
1857 | ||
80909e04 MM |
1858 | if (!chan->conn) { |
1859 | l2cap_chan_unlock(chan); | |
1860 | l2cap_chan_put(chan); | |
1861 | return; | |
1862 | } | |
6be36555 | 1863 | |
401bb1f7 | 1864 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1865 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1866 | l2cap_chan_put(chan); |
e90bac06 GP |
1867 | } |
1868 | ||
d660366d GP |
1869 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1870 | struct sk_buff_head *skbs) | |
6840ed07 | 1871 | { |
ccbb84af | 1872 | struct sk_buff *skb; |
3733937d | 1873 | struct l2cap_ctrl *control; |
6840ed07 | 1874 | |
3733937d MM |
1875 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1876 | ||
b99e13ad MM |
1877 | if (__chan_is_moving(chan)) |
1878 | return; | |
1879 | ||
3733937d MM |
1880 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1881 | ||
1882 | while (!skb_queue_empty(&chan->tx_q)) { | |
1883 | ||
1884 | skb = skb_dequeue(&chan->tx_q); | |
1885 | ||
1886 | bt_cb(skb)->control.retries = 1; | |
1887 | control = &bt_cb(skb)->control; | |
1888 | ||
1889 | control->reqseq = 0; | |
1890 | control->txseq = chan->next_tx_seq; | |
1891 | ||
1892 | __pack_control(chan, control, skb); | |
6840ed07 | 1893 | |
47d1ec61 | 1894 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1895 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1896 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1897 | } |
1898 | ||
4343478f | 1899 | l2cap_do_send(chan, skb); |
6840ed07 | 1900 | |
b4400672 | 1901 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1902 | |
836be934 | 1903 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1904 | chan->frames_sent++; |
6840ed07 | 1905 | } |
6840ed07 GP |
1906 | } |
1907 | ||
67c9e840 | 1908 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1909 | { |
1910 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1911 | struct l2cap_ctrl *control; |
1912 | int sent = 0; | |
1913 | ||
1914 | BT_DBG("chan %p", chan); | |
1c2acffb | 1915 | |
89bc500e | 1916 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1917 | return -ENOTCONN; |
e90bac06 | 1918 | |
94122bbe MM |
1919 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1920 | return 0; | |
1921 | ||
b99e13ad MM |
1922 | if (__chan_is_moving(chan)) |
1923 | return 0; | |
1924 | ||
18a48e76 MM |
1925 | while (chan->tx_send_head && |
1926 | chan->unacked_frames < chan->remote_tx_win && | |
1927 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1928 | |
18a48e76 | 1929 | skb = chan->tx_send_head; |
e90bac06 | 1930 | |
18a48e76 MM |
1931 | bt_cb(skb)->control.retries = 1; |
1932 | control = &bt_cb(skb)->control; | |
95ffa978 | 1933 | |
e2ab4353 | 1934 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1935 | control->final = 1; |
e2ab4353 | 1936 | |
18a48e76 MM |
1937 | control->reqseq = chan->buffer_seq; |
1938 | chan->last_acked_seq = chan->buffer_seq; | |
1939 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1940 | |
18a48e76 | 1941 | __pack_control(chan, control, skb); |
e90bac06 | 1942 | |
47d1ec61 | 1943 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1944 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1945 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1946 | } |
1947 | ||
18a48e76 MM |
1948 | /* Clone after data has been modified. Data is assumed to be |
1949 | read-only (for locking purposes) on cloned sk_buffs. | |
1950 | */ | |
1951 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1952 | |
18a48e76 MM |
1953 | if (!tx_skb) |
1954 | break; | |
1c2acffb | 1955 | |
18a48e76 | 1956 | __set_retrans_timer(chan); |
836be934 AE |
1957 | |
1958 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1959 | chan->unacked_frames++; |
6a026610 | 1960 | chan->frames_sent++; |
18a48e76 | 1961 | sent++; |
1c2acffb | 1962 | |
58d35f87 GP |
1963 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1964 | chan->tx_send_head = NULL; | |
1c2acffb | 1965 | else |
58d35f87 | 1966 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1967 | |
1968 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1969 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1970 | } |
1971 | ||
b4400672 AE |
1972 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1973 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1974 | |
1975 | return sent; | |
9e917af1 GP |
1976 | } |
1977 | ||
e1fbd4c1 MM |
1978 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1979 | { | |
1980 | struct l2cap_ctrl control; | |
1981 | struct sk_buff *skb; | |
1982 | struct sk_buff *tx_skb; | |
1983 | u16 seq; | |
1984 | ||
1985 | BT_DBG("chan %p", chan); | |
1986 | ||
1987 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1988 | return; | |
1989 | ||
b99e13ad MM |
1990 | if (__chan_is_moving(chan)) |
1991 | return; | |
1992 | ||
e1fbd4c1 MM |
1993 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
1994 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1995 | ||
1996 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1997 | if (!skb) { | |
1998 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1999 | seq); |
e1fbd4c1 MM |
2000 | continue; |
2001 | } | |
2002 | ||
2003 | bt_cb(skb)->control.retries++; | |
2004 | control = bt_cb(skb)->control; | |
2005 | ||
2006 | if (chan->max_tx != 0 && | |
2007 | bt_cb(skb)->control.retries > chan->max_tx) { | |
2008 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 2009 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
2010 | l2cap_seq_list_clear(&chan->retrans_list); |
2011 | break; | |
2012 | } | |
2013 | ||
2014 | control.reqseq = chan->buffer_seq; | |
2015 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
2016 | control.final = 1; | |
2017 | else | |
2018 | control.final = 0; | |
2019 | ||
2020 | if (skb_cloned(skb)) { | |
2021 | /* Cloned sk_buffs are read-only, so we need a | |
2022 | * writeable copy | |
2023 | */ | |
8bcde1f2 | 2024 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 2025 | } else { |
8bcde1f2 | 2026 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
2027 | } |
2028 | ||
2029 | if (!tx_skb) { | |
2030 | l2cap_seq_list_clear(&chan->retrans_list); | |
2031 | break; | |
2032 | } | |
2033 | ||
2034 | /* Update skb contents */ | |
2035 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
2036 | put_unaligned_le32(__pack_extended_control(&control), | |
2037 | tx_skb->data + L2CAP_HDR_SIZE); | |
2038 | } else { | |
2039 | put_unaligned_le16(__pack_enhanced_control(&control), | |
2040 | tx_skb->data + L2CAP_HDR_SIZE); | |
2041 | } | |
2042 | ||
2043 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
2044 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
2045 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
2046 | L2CAP_FCS_SIZE)); | |
2047 | } | |
2048 | ||
2049 | l2cap_do_send(chan, tx_skb); | |
2050 | ||
2051 | BT_DBG("Resent txseq %d", control.txseq); | |
2052 | ||
2053 | chan->last_acked_seq = chan->buffer_seq; | |
2054 | } | |
2055 | } | |
2056 | ||
f80842a8 MM |
2057 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2058 | struct l2cap_ctrl *control) | |
2059 | { | |
2060 | BT_DBG("chan %p, control %p", chan, control); | |
2061 | ||
2062 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2063 | l2cap_ertm_resend(chan); | |
2064 | } | |
2065 | ||
d2a7ac5d MM |
2066 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2067 | struct l2cap_ctrl *control) | |
2068 | { | |
e1fbd4c1 MM |
2069 | struct sk_buff *skb; |
2070 | ||
2071 | BT_DBG("chan %p, control %p", chan, control); | |
2072 | ||
2073 | if (control->poll) | |
2074 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2075 | ||
2076 | l2cap_seq_list_clear(&chan->retrans_list); | |
2077 | ||
2078 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2079 | return; | |
2080 | ||
2081 | if (chan->unacked_frames) { | |
2082 | skb_queue_walk(&chan->tx_q, skb) { | |
2083 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2084 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2085 | break; |
2086 | } | |
2087 | ||
2088 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2089 | if (skb == chan->tx_send_head) | |
2090 | break; | |
2091 | ||
2092 | l2cap_seq_list_append(&chan->retrans_list, | |
2093 | bt_cb(skb)->control.txseq); | |
2094 | } | |
2095 | ||
2096 | l2cap_ertm_resend(chan); | |
2097 | } | |
d2a7ac5d MM |
2098 | } |
2099 | ||
0a0aba42 | 2100 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2101 | { |
0a0aba42 MM |
2102 | struct l2cap_ctrl control; |
2103 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2104 | chan->last_acked_seq); | |
2105 | int threshold; | |
9e917af1 | 2106 | |
0a0aba42 MM |
2107 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2108 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2109 | |
0a0aba42 MM |
2110 | memset(&control, 0, sizeof(control)); |
2111 | control.sframe = 1; | |
dfc909be | 2112 | |
0a0aba42 MM |
2113 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2114 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2115 | __clear_ack_timer(chan); | |
2116 | control.super = L2CAP_SUPER_RNR; | |
2117 | control.reqseq = chan->buffer_seq; | |
2118 | l2cap_send_sframe(chan, &control); | |
2119 | } else { | |
2120 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2121 | l2cap_ertm_send(chan); | |
2122 | /* If any i-frames were sent, they included an ack */ | |
2123 | if (chan->buffer_seq == chan->last_acked_seq) | |
2124 | frames_to_ack = 0; | |
2125 | } | |
dfc909be | 2126 | |
c20f8e35 | 2127 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2128 | * Calculate without mul or div |
2129 | */ | |
c20f8e35 | 2130 | threshold = chan->ack_win; |
0a0aba42 MM |
2131 | threshold += threshold << 1; |
2132 | threshold >>= 2; | |
2133 | ||
b4400672 | 2134 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2135 | threshold); |
2136 | ||
2137 | if (frames_to_ack >= threshold) { | |
2138 | __clear_ack_timer(chan); | |
2139 | control.super = L2CAP_SUPER_RR; | |
2140 | control.reqseq = chan->buffer_seq; | |
2141 | l2cap_send_sframe(chan, &control); | |
2142 | frames_to_ack = 0; | |
2143 | } | |
1c2acffb | 2144 | |
0a0aba42 MM |
2145 | if (frames_to_ack) |
2146 | __set_ack_timer(chan); | |
2147 | } | |
b17e73bb SJ |
2148 | } |
2149 | ||
04124681 GP |
2150 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2151 | struct msghdr *msg, int len, | |
2152 | int count, struct sk_buff *skb) | |
1c2acffb | 2153 | { |
0952a57a | 2154 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2155 | struct sk_buff **frag; |
90338947 | 2156 | int sent = 0; |
1da177e4 | 2157 | |
0498878b JR |
2158 | if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count), |
2159 | msg->msg_iov, count)) | |
1c2acffb | 2160 | return -EFAULT; |
1da177e4 LT |
2161 | |
2162 | sent += count; | |
2163 | len -= count; | |
2164 | ||
2165 | /* Continuation fragments (no L2CAP header) */ | |
2166 | frag = &skb_shinfo(skb)->frag_list; | |
2167 | while (len) { | |
fbe00700 GP |
2168 | struct sk_buff *tmp; |
2169 | ||
1da177e4 LT |
2170 | count = min_t(unsigned int, conn->mtu, len); |
2171 | ||
d9fbd02b | 2172 | tmp = chan->ops->alloc_skb(chan, 0, count, |
fbe00700 GP |
2173 | msg->msg_flags & MSG_DONTWAIT); |
2174 | if (IS_ERR(tmp)) | |
2175 | return PTR_ERR(tmp); | |
2176 | ||
2177 | *frag = tmp; | |
2f7719ce | 2178 | |
0498878b JR |
2179 | if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count), |
2180 | msg->msg_iov, count)) | |
1c2acffb | 2181 | return -EFAULT; |
1da177e4 LT |
2182 | |
2183 | sent += count; | |
2184 | len -= count; | |
2185 | ||
2d0ed3d5 GP |
2186 | skb->len += (*frag)->len; |
2187 | skb->data_len += (*frag)->len; | |
2188 | ||
1da177e4 LT |
2189 | frag = &(*frag)->next; |
2190 | } | |
1da177e4 LT |
2191 | |
2192 | return sent; | |
1c2acffb | 2193 | } |
1da177e4 | 2194 | |
5e59b791 | 2195 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
8d46321c | 2196 | struct msghdr *msg, size_t len) |
1c2acffb | 2197 | { |
8c1d787b | 2198 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2199 | struct sk_buff *skb; |
03a51213 | 2200 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2201 | struct l2cap_hdr *lh; |
2202 | ||
8d46321c MH |
2203 | BT_DBG("chan %p psm 0x%2.2x len %zu", chan, |
2204 | __le16_to_cpu(chan->psm), len); | |
1c2acffb GP |
2205 | |
2206 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce | 2207 | |
d9fbd02b | 2208 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2209 | msg->msg_flags & MSG_DONTWAIT); |
2210 | if (IS_ERR(skb)) | |
2211 | return skb; | |
1c2acffb GP |
2212 | |
2213 | /* Create L2CAP header */ | |
2214 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2215 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2216 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2217 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2218 | |
0952a57a | 2219 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2220 | if (unlikely(err < 0)) { |
2221 | kfree_skb(skb); | |
2222 | return ERR_PTR(err); | |
2223 | } | |
2224 | return skb; | |
2225 | } | |
2226 | ||
5e59b791 | 2227 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
8d46321c | 2228 | struct msghdr *msg, size_t len) |
1c2acffb | 2229 | { |
8c1d787b | 2230 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2231 | struct sk_buff *skb; |
f2ba7fae | 2232 | int err, count; |
1c2acffb GP |
2233 | struct l2cap_hdr *lh; |
2234 | ||
b4400672 | 2235 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2236 | |
f2ba7fae | 2237 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2238 | |
d9fbd02b | 2239 | skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, |
90338947 GP |
2240 | msg->msg_flags & MSG_DONTWAIT); |
2241 | if (IS_ERR(skb)) | |
2242 | return skb; | |
1c2acffb GP |
2243 | |
2244 | /* Create L2CAP header */ | |
2245 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2246 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2247 | lh->len = cpu_to_le16(len); |
1c2acffb | 2248 | |
0952a57a | 2249 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2250 | if (unlikely(err < 0)) { |
2251 | kfree_skb(skb); | |
2252 | return ERR_PTR(err); | |
2253 | } | |
2254 | return skb; | |
2255 | } | |
2256 | ||
ab0ff76d | 2257 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2258 | struct msghdr *msg, size_t len, |
2259 | u16 sdulen) | |
1c2acffb | 2260 | { |
8c1d787b | 2261 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2262 | struct sk_buff *skb; |
e4ca6d98 | 2263 | int err, count, hlen; |
1c2acffb GP |
2264 | struct l2cap_hdr *lh; |
2265 | ||
b4400672 | 2266 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2267 | |
0ee0d208 GP |
2268 | if (!conn) |
2269 | return ERR_PTR(-ENOTCONN); | |
2270 | ||
ba7aa64f | 2271 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2272 | |
c74e560c | 2273 | if (sdulen) |
03a51213 | 2274 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2275 | |
47d1ec61 | 2276 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2277 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2278 | |
1c2acffb | 2279 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce | 2280 | |
d9fbd02b | 2281 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2282 | msg->msg_flags & MSG_DONTWAIT); |
2283 | if (IS_ERR(skb)) | |
2284 | return skb; | |
1c2acffb GP |
2285 | |
2286 | /* Create L2CAP header */ | |
2287 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2288 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2289 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2290 | |
18a48e76 MM |
2291 | /* Control header is populated later */ |
2292 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2293 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2294 | else | |
2295 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2296 | |
c74e560c | 2297 | if (sdulen) |
03a51213 | 2298 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2299 | |
0952a57a | 2300 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2301 | if (unlikely(err < 0)) { |
2302 | kfree_skb(skb); | |
2303 | return ERR_PTR(err); | |
2304 | } | |
e90bac06 | 2305 | |
18a48e76 | 2306 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2307 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2308 | return skb; |
1da177e4 LT |
2309 | } |
2310 | ||
94122bbe MM |
2311 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2312 | struct sk_buff_head *seg_queue, | |
2313 | struct msghdr *msg, size_t len) | |
c74e560c | 2314 | { |
c74e560c | 2315 | struct sk_buff *skb; |
94122bbe MM |
2316 | u16 sdu_len; |
2317 | size_t pdu_len; | |
94122bbe | 2318 | u8 sar; |
c74e560c | 2319 | |
b4400672 | 2320 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2321 | |
94122bbe MM |
2322 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2323 | * so fragmented skbs are not used. The HCI layer's handling | |
2324 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2325 | */ | |
c74e560c | 2326 | |
94122bbe MM |
2327 | /* PDU size is derived from the HCI MTU */ |
2328 | pdu_len = chan->conn->mtu; | |
c74e560c | 2329 | |
a549574d MM |
2330 | /* Constrain PDU size for BR/EDR connections */ |
2331 | if (!chan->hs_hcon) | |
2332 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2333 | |
2334 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2335 | if (chan->fcs) |
2336 | pdu_len -= L2CAP_FCS_SIZE; | |
2337 | ||
ba7aa64f | 2338 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2339 | |
2340 | /* Remote device may have requested smaller PDUs */ | |
2341 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2342 | ||
2343 | if (len <= pdu_len) { | |
2344 | sar = L2CAP_SAR_UNSEGMENTED; | |
2345 | sdu_len = 0; | |
2346 | pdu_len = len; | |
2347 | } else { | |
2348 | sar = L2CAP_SAR_START; | |
2349 | sdu_len = len; | |
2350 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2351 | } | |
2352 | ||
2353 | while (len > 0) { | |
2354 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2355 | |
c74e560c | 2356 | if (IS_ERR(skb)) { |
94122bbe | 2357 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2358 | return PTR_ERR(skb); |
2359 | } | |
2360 | ||
94122bbe MM |
2361 | bt_cb(skb)->control.sar = sar; |
2362 | __skb_queue_tail(seg_queue, skb); | |
2363 | ||
2364 | len -= pdu_len; | |
2365 | if (sdu_len) { | |
2366 | sdu_len = 0; | |
2367 | pdu_len += L2CAP_SDULEN_SIZE; | |
2368 | } | |
2369 | ||
2370 | if (len <= pdu_len) { | |
2371 | sar = L2CAP_SAR_END; | |
2372 | pdu_len = len; | |
2373 | } else { | |
2374 | sar = L2CAP_SAR_CONTINUE; | |
2375 | } | |
c74e560c | 2376 | } |
c74e560c | 2377 | |
f0f62799 | 2378 | return 0; |
c74e560c GP |
2379 | } |
2380 | ||
177f8f2b JH |
2381 | static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, |
2382 | struct msghdr *msg, | |
2383 | size_t len, u16 sdulen) | |
2384 | { | |
2385 | struct l2cap_conn *conn = chan->conn; | |
2386 | struct sk_buff *skb; | |
2387 | int err, count, hlen; | |
2388 | struct l2cap_hdr *lh; | |
2389 | ||
2390 | BT_DBG("chan %p len %zu", chan, len); | |
2391 | ||
2392 | if (!conn) | |
2393 | return ERR_PTR(-ENOTCONN); | |
2394 | ||
2395 | hlen = L2CAP_HDR_SIZE; | |
2396 | ||
2397 | if (sdulen) | |
2398 | hlen += L2CAP_SDULEN_SIZE; | |
2399 | ||
2400 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2401 | ||
d9fbd02b | 2402 | skb = chan->ops->alloc_skb(chan, hlen, count, |
177f8f2b JH |
2403 | msg->msg_flags & MSG_DONTWAIT); |
2404 | if (IS_ERR(skb)) | |
2405 | return skb; | |
2406 | ||
2407 | /* Create L2CAP header */ | |
2408 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
2409 | lh->cid = cpu_to_le16(chan->dcid); | |
2410 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
2411 | ||
2412 | if (sdulen) | |
2413 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); | |
2414 | ||
2415 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); | |
2416 | if (unlikely(err < 0)) { | |
2417 | kfree_skb(skb); | |
2418 | return ERR_PTR(err); | |
2419 | } | |
2420 | ||
2421 | return skb; | |
2422 | } | |
2423 | ||
2424 | static int l2cap_segment_le_sdu(struct l2cap_chan *chan, | |
2425 | struct sk_buff_head *seg_queue, | |
2426 | struct msghdr *msg, size_t len) | |
2427 | { | |
2428 | struct sk_buff *skb; | |
2429 | size_t pdu_len; | |
2430 | u16 sdu_len; | |
2431 | ||
2432 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); | |
2433 | ||
2434 | pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE; | |
2435 | ||
2436 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2437 | ||
2438 | sdu_len = len; | |
2439 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2440 | ||
2441 | while (len > 0) { | |
2442 | if (len <= pdu_len) | |
2443 | pdu_len = len; | |
2444 | ||
2445 | skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); | |
2446 | if (IS_ERR(skb)) { | |
2447 | __skb_queue_purge(seg_queue); | |
2448 | return PTR_ERR(skb); | |
2449 | } | |
2450 | ||
2451 | __skb_queue_tail(seg_queue, skb); | |
2452 | ||
2453 | len -= pdu_len; | |
2454 | ||
2455 | if (sdu_len) { | |
2456 | sdu_len = 0; | |
2457 | pdu_len += L2CAP_SDULEN_SIZE; | |
2458 | } | |
2459 | } | |
2460 | ||
2461 | return 0; | |
2462 | } | |
2463 | ||
8d46321c | 2464 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
9a91a04a | 2465 | { |
9a91a04a | 2466 | struct sk_buff *skb; |
9a91a04a | 2467 | int err; |
94122bbe | 2468 | struct sk_buff_head seg_queue; |
9a91a04a | 2469 | |
31e8ce80 SWK |
2470 | if (!chan->conn) |
2471 | return -ENOTCONN; | |
2472 | ||
9a91a04a | 2473 | /* Connectionless channel */ |
715ec005 | 2474 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
8d46321c | 2475 | skb = l2cap_create_connless_pdu(chan, msg, len); |
9a91a04a GP |
2476 | if (IS_ERR(skb)) |
2477 | return PTR_ERR(skb); | |
2478 | ||
ede81a2a AK |
2479 | /* Channel lock is released before requesting new skb and then |
2480 | * reacquired thus we need to recheck channel state. | |
2481 | */ | |
2482 | if (chan->state != BT_CONNECTED) { | |
2483 | kfree_skb(skb); | |
2484 | return -ENOTCONN; | |
2485 | } | |
2486 | ||
9a91a04a GP |
2487 | l2cap_do_send(chan, skb); |
2488 | return len; | |
2489 | } | |
2490 | ||
2491 | switch (chan->mode) { | |
38319713 | 2492 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b JH |
2493 | /* Check outgoing MTU */ |
2494 | if (len > chan->omtu) | |
2495 | return -EMSGSIZE; | |
2496 | ||
fad5fc89 JH |
2497 | if (!chan->tx_credits) |
2498 | return -EAGAIN; | |
2499 | ||
177f8f2b JH |
2500 | __skb_queue_head_init(&seg_queue); |
2501 | ||
2502 | err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); | |
2503 | ||
2504 | if (chan->state != BT_CONNECTED) { | |
2505 | __skb_queue_purge(&seg_queue); | |
2506 | err = -ENOTCONN; | |
2507 | } | |
2508 | ||
2509 | if (err) | |
2510 | return err; | |
2511 | ||
2512 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); | |
2513 | ||
2514 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
2515 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
2516 | chan->tx_credits--; | |
2517 | } | |
2518 | ||
2519 | if (!chan->tx_credits) | |
2520 | chan->ops->suspend(chan); | |
2521 | ||
2522 | err = len; | |
2523 | ||
2524 | break; | |
2525 | ||
fad5fc89 | 2526 | case L2CAP_MODE_BASIC: |
9a91a04a GP |
2527 | /* Check outgoing MTU */ |
2528 | if (len > chan->omtu) | |
2529 | return -EMSGSIZE; | |
2530 | ||
2531 | /* Create a basic PDU */ | |
8d46321c | 2532 | skb = l2cap_create_basic_pdu(chan, msg, len); |
9a91a04a GP |
2533 | if (IS_ERR(skb)) |
2534 | return PTR_ERR(skb); | |
2535 | ||
ede81a2a AK |
2536 | /* Channel lock is released before requesting new skb and then |
2537 | * reacquired thus we need to recheck channel state. | |
2538 | */ | |
2539 | if (chan->state != BT_CONNECTED) { | |
2540 | kfree_skb(skb); | |
2541 | return -ENOTCONN; | |
2542 | } | |
2543 | ||
9a91a04a GP |
2544 | l2cap_do_send(chan, skb); |
2545 | err = len; | |
2546 | break; | |
2547 | ||
2548 | case L2CAP_MODE_ERTM: | |
2549 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2550 | /* Check outgoing MTU */ |
2551 | if (len > chan->omtu) { | |
2552 | err = -EMSGSIZE; | |
2553 | break; | |
2554 | } | |
9a91a04a | 2555 | |
94122bbe | 2556 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2557 | |
94122bbe MM |
2558 | /* Do segmentation before calling in to the state machine, |
2559 | * since it's possible to block while waiting for memory | |
2560 | * allocation. | |
2561 | */ | |
2562 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2563 | |
94122bbe MM |
2564 | /* The channel could have been closed while segmenting, |
2565 | * check that it is still connected. | |
2566 | */ | |
2567 | if (chan->state != BT_CONNECTED) { | |
2568 | __skb_queue_purge(&seg_queue); | |
2569 | err = -ENOTCONN; | |
9a91a04a GP |
2570 | } |
2571 | ||
94122bbe | 2572 | if (err) |
9a91a04a | 2573 | break; |
9a91a04a | 2574 | |
3733937d | 2575 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2576 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2577 | else |
d660366d | 2578 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2579 | |
d660366d | 2580 | err = len; |
9a91a04a | 2581 | |
94122bbe MM |
2582 | /* If the skbs were not queued for sending, they'll still be in |
2583 | * seg_queue and need to be purged. | |
2584 | */ | |
2585 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2586 | break; |
2587 | ||
2588 | default: | |
2589 | BT_DBG("bad state %1.1x", chan->mode); | |
2590 | err = -EBADFD; | |
2591 | } | |
2592 | ||
2593 | return err; | |
2594 | } | |
6b8d4a6a | 2595 | EXPORT_SYMBOL_GPL(l2cap_chan_send); |
9a91a04a | 2596 | |
d2a7ac5d MM |
2597 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2598 | { | |
bed68bde MM |
2599 | struct l2cap_ctrl control; |
2600 | u16 seq; | |
2601 | ||
b4400672 | 2602 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2603 | |
2604 | memset(&control, 0, sizeof(control)); | |
2605 | control.sframe = 1; | |
2606 | control.super = L2CAP_SUPER_SREJ; | |
2607 | ||
2608 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2609 | seq = __next_seq(chan, seq)) { | |
2610 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2611 | control.reqseq = seq; | |
2612 | l2cap_send_sframe(chan, &control); | |
2613 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2614 | } | |
2615 | } | |
2616 | ||
2617 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2618 | } |
2619 | ||
2620 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2621 | { | |
bed68bde MM |
2622 | struct l2cap_ctrl control; |
2623 | ||
2624 | BT_DBG("chan %p", chan); | |
2625 | ||
2626 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2627 | return; | |
2628 | ||
2629 | memset(&control, 0, sizeof(control)); | |
2630 | control.sframe = 1; | |
2631 | control.super = L2CAP_SUPER_SREJ; | |
2632 | control.reqseq = chan->srej_list.tail; | |
2633 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2634 | } |
2635 | ||
2636 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2637 | { | |
bed68bde MM |
2638 | struct l2cap_ctrl control; |
2639 | u16 initial_head; | |
2640 | u16 seq; | |
2641 | ||
b4400672 | 2642 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2643 | |
2644 | memset(&control, 0, sizeof(control)); | |
2645 | control.sframe = 1; | |
2646 | control.super = L2CAP_SUPER_SREJ; | |
2647 | ||
2648 | /* Capture initial list head to allow only one pass through the list. */ | |
2649 | initial_head = chan->srej_list.head; | |
2650 | ||
2651 | do { | |
2652 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2653 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2654 | break; | |
2655 | ||
2656 | control.reqseq = seq; | |
2657 | l2cap_send_sframe(chan, &control); | |
2658 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2659 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2660 | } |
2661 | ||
608bcc6d MM |
2662 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2663 | { | |
2664 | struct sk_buff *acked_skb; | |
2665 | u16 ackseq; | |
2666 | ||
b4400672 | 2667 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2668 | |
2669 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2670 | return; | |
2671 | ||
b4400672 | 2672 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2673 | chan->expected_ack_seq, chan->unacked_frames); |
2674 | ||
2675 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2676 | ackseq = __next_seq(chan, ackseq)) { | |
2677 | ||
2678 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2679 | if (acked_skb) { | |
2680 | skb_unlink(acked_skb, &chan->tx_q); | |
2681 | kfree_skb(acked_skb); | |
2682 | chan->unacked_frames--; | |
2683 | } | |
2684 | } | |
2685 | ||
2686 | chan->expected_ack_seq = reqseq; | |
2687 | ||
2688 | if (chan->unacked_frames == 0) | |
2689 | __clear_retrans_timer(chan); | |
2690 | ||
b4400672 | 2691 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2692 | } |
2693 | ||
2694 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2695 | { | |
2696 | BT_DBG("chan %p", chan); | |
2697 | ||
2698 | chan->expected_tx_seq = chan->buffer_seq; | |
2699 | l2cap_seq_list_clear(&chan->srej_list); | |
2700 | skb_queue_purge(&chan->srej_q); | |
2701 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2702 | } | |
2703 | ||
d660366d GP |
2704 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2705 | struct l2cap_ctrl *control, | |
2706 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2707 | { |
608bcc6d MM |
2708 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2709 | event); | |
2710 | ||
2711 | switch (event) { | |
2712 | case L2CAP_EV_DATA_REQUEST: | |
2713 | if (chan->tx_send_head == NULL) | |
2714 | chan->tx_send_head = skb_peek(skbs); | |
2715 | ||
2716 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2717 | l2cap_ertm_send(chan); | |
2718 | break; | |
2719 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2720 | BT_DBG("Enter LOCAL_BUSY"); | |
2721 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2722 | ||
2723 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2724 | /* The SREJ_SENT state must be aborted if we are to | |
2725 | * enter the LOCAL_BUSY state. | |
2726 | */ | |
2727 | l2cap_abort_rx_srej_sent(chan); | |
2728 | } | |
2729 | ||
2730 | l2cap_send_ack(chan); | |
2731 | ||
2732 | break; | |
2733 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2734 | BT_DBG("Exit LOCAL_BUSY"); | |
2735 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2736 | ||
2737 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2738 | struct l2cap_ctrl local_control; | |
2739 | ||
2740 | memset(&local_control, 0, sizeof(local_control)); | |
2741 | local_control.sframe = 1; | |
2742 | local_control.super = L2CAP_SUPER_RR; | |
2743 | local_control.poll = 1; | |
2744 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2745 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2746 | |
2747 | chan->retry_count = 1; | |
2748 | __set_monitor_timer(chan); | |
2749 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2750 | } | |
2751 | break; | |
2752 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2753 | l2cap_process_reqseq(chan, control->reqseq); | |
2754 | break; | |
2755 | case L2CAP_EV_EXPLICIT_POLL: | |
2756 | l2cap_send_rr_or_rnr(chan, 1); | |
2757 | chan->retry_count = 1; | |
2758 | __set_monitor_timer(chan); | |
2759 | __clear_ack_timer(chan); | |
2760 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2761 | break; | |
2762 | case L2CAP_EV_RETRANS_TO: | |
2763 | l2cap_send_rr_or_rnr(chan, 1); | |
2764 | chan->retry_count = 1; | |
2765 | __set_monitor_timer(chan); | |
2766 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2767 | break; | |
2768 | case L2CAP_EV_RECV_FBIT: | |
2769 | /* Nothing to process */ | |
2770 | break; | |
2771 | default: | |
2772 | break; | |
2773 | } | |
608bcc6d MM |
2774 | } |
2775 | ||
d660366d GP |
2776 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2777 | struct l2cap_ctrl *control, | |
2778 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2779 | { |
608bcc6d MM |
2780 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2781 | event); | |
2782 | ||
2783 | switch (event) { | |
2784 | case L2CAP_EV_DATA_REQUEST: | |
2785 | if (chan->tx_send_head == NULL) | |
2786 | chan->tx_send_head = skb_peek(skbs); | |
2787 | /* Queue data, but don't send. */ | |
2788 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2789 | break; | |
2790 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2791 | BT_DBG("Enter LOCAL_BUSY"); | |
2792 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2793 | ||
2794 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2795 | /* The SREJ_SENT state must be aborted if we are to | |
2796 | * enter the LOCAL_BUSY state. | |
2797 | */ | |
2798 | l2cap_abort_rx_srej_sent(chan); | |
2799 | } | |
2800 | ||
2801 | l2cap_send_ack(chan); | |
2802 | ||
2803 | break; | |
2804 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2805 | BT_DBG("Exit LOCAL_BUSY"); | |
2806 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2807 | ||
2808 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2809 | struct l2cap_ctrl local_control; | |
2810 | memset(&local_control, 0, sizeof(local_control)); | |
2811 | local_control.sframe = 1; | |
2812 | local_control.super = L2CAP_SUPER_RR; | |
2813 | local_control.poll = 1; | |
2814 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2815 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2816 | |
2817 | chan->retry_count = 1; | |
2818 | __set_monitor_timer(chan); | |
2819 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2820 | } | |
2821 | break; | |
2822 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2823 | l2cap_process_reqseq(chan, control->reqseq); | |
2824 | ||
2825 | /* Fall through */ | |
2826 | ||
2827 | case L2CAP_EV_RECV_FBIT: | |
2828 | if (control && control->final) { | |
2829 | __clear_monitor_timer(chan); | |
2830 | if (chan->unacked_frames > 0) | |
2831 | __set_retrans_timer(chan); | |
2832 | chan->retry_count = 0; | |
2833 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2834 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2835 | } | |
2836 | break; | |
2837 | case L2CAP_EV_EXPLICIT_POLL: | |
2838 | /* Ignore */ | |
2839 | break; | |
2840 | case L2CAP_EV_MONITOR_TO: | |
2841 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2842 | l2cap_send_rr_or_rnr(chan, 1); | |
2843 | __set_monitor_timer(chan); | |
2844 | chan->retry_count++; | |
2845 | } else { | |
5e4e3972 | 2846 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2847 | } |
2848 | break; | |
2849 | default: | |
2850 | break; | |
2851 | } | |
608bcc6d MM |
2852 | } |
2853 | ||
d660366d GP |
2854 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2855 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2856 | { |
608bcc6d MM |
2857 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2858 | chan, control, skbs, event, chan->tx_state); | |
2859 | ||
2860 | switch (chan->tx_state) { | |
2861 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2862 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2863 | break; |
2864 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2865 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2866 | break; |
2867 | default: | |
2868 | /* Ignore event */ | |
2869 | break; | |
2870 | } | |
608bcc6d MM |
2871 | } |
2872 | ||
4b51dae9 MM |
2873 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2874 | struct l2cap_ctrl *control) | |
2875 | { | |
2876 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2877 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2878 | } |
2879 | ||
f80842a8 MM |
2880 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2881 | struct l2cap_ctrl *control) | |
2882 | { | |
2883 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2884 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2885 | } |
2886 | ||
1da177e4 LT |
2887 | /* Copy frame to all raw sockets on that connection */ |
2888 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2889 | { | |
1da177e4 | 2890 | struct sk_buff *nskb; |
48454079 | 2891 | struct l2cap_chan *chan; |
1da177e4 LT |
2892 | |
2893 | BT_DBG("conn %p", conn); | |
2894 | ||
3df91ea2 | 2895 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2896 | |
3df91ea2 | 2897 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2898 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2899 | continue; |
2900 | ||
7f5396a7 GP |
2901 | /* Don't send frame to the channel it came from */ |
2902 | if (bt_cb(skb)->chan == chan) | |
1da177e4 | 2903 | continue; |
7f5396a7 | 2904 | |
8bcde1f2 | 2905 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2906 | if (!nskb) |
1da177e4 | 2907 | continue; |
80b98027 | 2908 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2909 | kfree_skb(nskb); |
2910 | } | |
3d57dc68 | 2911 | |
3df91ea2 | 2912 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2913 | } |
2914 | ||
2915 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2916 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2917 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2918 | { |
2919 | struct sk_buff *skb, **frag; | |
2920 | struct l2cap_cmd_hdr *cmd; | |
2921 | struct l2cap_hdr *lh; | |
2922 | int len, count; | |
2923 | ||
b4400672 AE |
2924 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2925 | conn, code, ident, dlen); | |
1da177e4 | 2926 | |
300b962e AL |
2927 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2928 | return NULL; | |
2929 | ||
1da177e4 LT |
2930 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2931 | count = min_t(unsigned int, conn->mtu, len); | |
2932 | ||
8bcde1f2 | 2933 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2934 | if (!skb) |
2935 | return NULL; | |
2936 | ||
2937 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2938 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2939 | |
2940 | if (conn->hcon->type == LE_LINK) | |
dcf4adbf | 2941 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2942 | else |
dcf4adbf | 2943 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2944 | |
2945 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2946 | cmd->code = code; | |
2947 | cmd->ident = ident; | |
aca3192c | 2948 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2949 | |
2950 | if (dlen) { | |
2951 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2952 | memcpy(skb_put(skb, count), data, count); | |
2953 | data += count; | |
2954 | } | |
2955 | ||
2956 | len -= skb->len; | |
2957 | ||
2958 | /* Continuation fragments (no L2CAP header) */ | |
2959 | frag = &skb_shinfo(skb)->frag_list; | |
2960 | while (len) { | |
2961 | count = min_t(unsigned int, conn->mtu, len); | |
2962 | ||
8bcde1f2 | 2963 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2964 | if (!*frag) |
2965 | goto fail; | |
2966 | ||
2967 | memcpy(skb_put(*frag, count), data, count); | |
2968 | ||
2969 | len -= count; | |
2970 | data += count; | |
2971 | ||
2972 | frag = &(*frag)->next; | |
2973 | } | |
2974 | ||
2975 | return skb; | |
2976 | ||
2977 | fail: | |
2978 | kfree_skb(skb); | |
2979 | return NULL; | |
2980 | } | |
2981 | ||
2d792818 GP |
2982 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2983 | unsigned long *val) | |
1da177e4 LT |
2984 | { |
2985 | struct l2cap_conf_opt *opt = *ptr; | |
2986 | int len; | |
2987 | ||
2988 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2989 | *ptr += len; | |
2990 | ||
2991 | *type = opt->type; | |
2992 | *olen = opt->len; | |
2993 | ||
2994 | switch (opt->len) { | |
2995 | case 1: | |
2996 | *val = *((u8 *) opt->val); | |
2997 | break; | |
2998 | ||
2999 | case 2: | |
bfaaeb3e | 3000 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
3001 | break; |
3002 | ||
3003 | case 4: | |
bfaaeb3e | 3004 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
3005 | break; |
3006 | ||
3007 | default: | |
3008 | *val = (unsigned long) opt->val; | |
3009 | break; | |
3010 | } | |
3011 | ||
b4400672 | 3012 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
3013 | return len; |
3014 | } | |
3015 | ||
1da177e4 LT |
3016 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
3017 | { | |
3018 | struct l2cap_conf_opt *opt = *ptr; | |
3019 | ||
b4400672 | 3020 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
3021 | |
3022 | opt->type = type; | |
3023 | opt->len = len; | |
3024 | ||
3025 | switch (len) { | |
3026 | case 1: | |
3027 | *((u8 *) opt->val) = val; | |
3028 | break; | |
3029 | ||
3030 | case 2: | |
4f8b691c | 3031 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
3032 | break; |
3033 | ||
3034 | case 4: | |
4f8b691c | 3035 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
3036 | break; |
3037 | ||
3038 | default: | |
3039 | memcpy(opt->val, (void *) val, len); | |
3040 | break; | |
3041 | } | |
3042 | ||
3043 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
3044 | } | |
3045 | ||
f89cef09 AE |
3046 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
3047 | { | |
3048 | struct l2cap_conf_efs efs; | |
3049 | ||
1ec918ce | 3050 | switch (chan->mode) { |
f89cef09 AE |
3051 | case L2CAP_MODE_ERTM: |
3052 | efs.id = chan->local_id; | |
3053 | efs.stype = chan->local_stype; | |
3054 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3055 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
dcf4adbf JP |
3056 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
3057 | efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
3058 | break; |
3059 | ||
3060 | case L2CAP_MODE_STREAMING: | |
3061 | efs.id = 1; | |
3062 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
3063 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3064 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
3065 | efs.acc_lat = 0; | |
3066 | efs.flush_to = 0; | |
3067 | break; | |
3068 | ||
3069 | default: | |
3070 | return; | |
3071 | } | |
3072 | ||
3073 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 3074 | (unsigned long) &efs); |
f89cef09 AE |
3075 | } |
3076 | ||
721c4181 | 3077 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3078 | { |
721c4181 | 3079 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3080 | ack_timer.work); |
3081 | u16 frames_to_ack; | |
c1b4f43b | 3082 | |
2fb9b3d4 GP |
3083 | BT_DBG("chan %p", chan); |
3084 | ||
6be36555 AE |
3085 | l2cap_chan_lock(chan); |
3086 | ||
0362520b MM |
3087 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3088 | chan->last_acked_seq); | |
6be36555 | 3089 | |
0362520b MM |
3090 | if (frames_to_ack) |
3091 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3092 | |
0362520b | 3093 | l2cap_chan_unlock(chan); |
09bfb2ee | 3094 | l2cap_chan_put(chan); |
c1b4f43b GP |
3095 | } |
3096 | ||
466f8004 | 3097 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3098 | { |
3c588192 MM |
3099 | int err; |
3100 | ||
105bdf9e MM |
3101 | chan->next_tx_seq = 0; |
3102 | chan->expected_tx_seq = 0; | |
42e5c802 | 3103 | chan->expected_ack_seq = 0; |
6a026610 | 3104 | chan->unacked_frames = 0; |
42e5c802 | 3105 | chan->buffer_seq = 0; |
6a026610 | 3106 | chan->frames_sent = 0; |
105bdf9e MM |
3107 | chan->last_acked_seq = 0; |
3108 | chan->sdu = NULL; | |
3109 | chan->sdu_last_frag = NULL; | |
3110 | chan->sdu_len = 0; | |
3111 | ||
d34c34fb MM |
3112 | skb_queue_head_init(&chan->tx_q); |
3113 | ||
6ed971ca MH |
3114 | chan->local_amp_id = AMP_ID_BREDR; |
3115 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3116 | chan->move_state = L2CAP_MOVE_STABLE; |
3117 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3118 | ||
105bdf9e MM |
3119 | if (chan->mode != L2CAP_MODE_ERTM) |
3120 | return 0; | |
3121 | ||
3122 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3123 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3124 | |
721c4181 GP |
3125 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3126 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3127 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3128 | |
f1c6775b | 3129 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3130 | |
3c588192 MM |
3131 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3132 | if (err < 0) | |
3133 | return err; | |
3134 | ||
9dc9affc MM |
3135 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3136 | if (err < 0) | |
3137 | l2cap_seq_list_free(&chan->srej_list); | |
3138 | ||
3139 | return err; | |
0565c1c2 GP |
3140 | } |
3141 | ||
f2fcfcd6 GP |
3142 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3143 | { | |
3144 | switch (mode) { | |
3145 | case L2CAP_MODE_STREAMING: | |
3146 | case L2CAP_MODE_ERTM: | |
3147 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3148 | return mode; | |
3149 | /* fall through */ | |
3150 | default: | |
3151 | return L2CAP_MODE_BASIC; | |
3152 | } | |
3153 | } | |
3154 | ||
848566b3 | 3155 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3156 | { |
848566b3 | 3157 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; |
6327eb98 AE |
3158 | } |
3159 | ||
848566b3 | 3160 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3161 | { |
848566b3 | 3162 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; |
f89cef09 AE |
3163 | } |
3164 | ||
36c86c85 MM |
3165 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3166 | struct l2cap_conf_rfc *rfc) | |
3167 | { | |
6ed971ca | 3168 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3169 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3170 | ||
3171 | /* Class 1 devices have must have ERTM timeouts | |
3172 | * exceeding the Link Supervision Timeout. The | |
3173 | * default Link Supervision Timeout for AMP | |
3174 | * controllers is 10 seconds. | |
3175 | * | |
3176 | * Class 1 devices use 0xffffffff for their | |
3177 | * best-effort flush timeout, so the clamping logic | |
3178 | * will result in a timeout that meets the above | |
3179 | * requirement. ERTM timeouts are 16-bit values, so | |
3180 | * the maximum timeout is 65.535 seconds. | |
3181 | */ | |
3182 | ||
3183 | /* Convert timeout to milliseconds and round */ | |
3184 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3185 | ||
3186 | /* This is the recommended formula for class 2 devices | |
3187 | * that start ERTM timers when packets are sent to the | |
3188 | * controller. | |
3189 | */ | |
3190 | ertm_to = 3 * ertm_to + 500; | |
3191 | ||
3192 | if (ertm_to > 0xffff) | |
3193 | ertm_to = 0xffff; | |
3194 | ||
3195 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3196 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3197 | } else { | |
dcf4adbf JP |
3198 | rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3199 | rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36c86c85 MM |
3200 | } |
3201 | } | |
3202 | ||
6327eb98 AE |
3203 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3204 | { | |
3205 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3206 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3207 | /* use extended control field */ |
3208 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3209 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3210 | } else { | |
6327eb98 | 3211 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3212 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3213 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3214 | } | |
c20f8e35 | 3215 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3216 | } |
3217 | ||
710f9b0a | 3218 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3219 | { |
1da177e4 | 3220 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3221 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3222 | void *ptr = req->data; |
c8f79162 | 3223 | u16 size; |
1da177e4 | 3224 | |
49208c9c | 3225 | BT_DBG("chan %p", chan); |
1da177e4 | 3226 | |
73ffa904 | 3227 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3228 | goto done; |
3229 | ||
0c1bc5c6 | 3230 | switch (chan->mode) { |
f2fcfcd6 GP |
3231 | case L2CAP_MODE_STREAMING: |
3232 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3233 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3234 | break; |
85eb53c6 | 3235 | |
848566b3 | 3236 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3237 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3238 | ||
2ba13ed6 | 3239 | /* fall through */ |
f2fcfcd6 | 3240 | default: |
8c1d787b | 3241 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3242 | break; |
3243 | } | |
3244 | ||
3245 | done: | |
0c1bc5c6 GP |
3246 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3247 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3248 | |
0c1bc5c6 | 3249 | switch (chan->mode) { |
65c7c491 | 3250 | case L2CAP_MODE_BASIC: |
6fea7ad1 MH |
3251 | if (disable_ertm) |
3252 | break; | |
3253 | ||
8c1d787b | 3254 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3255 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3256 | break; |
3257 | ||
62547752 GP |
3258 | rfc.mode = L2CAP_MODE_BASIC; |
3259 | rfc.txwin_size = 0; | |
3260 | rfc.max_transmit = 0; | |
3261 | rfc.retrans_timeout = 0; | |
3262 | rfc.monitor_timeout = 0; | |
3263 | rfc.max_pdu_size = 0; | |
3264 | ||
63406504 | 3265 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3266 | (unsigned long) &rfc); |
65c7c491 MH |
3267 | break; |
3268 | ||
3269 | case L2CAP_MODE_ERTM: | |
3270 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3271 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3272 | |
3273 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
c8f79162 AE |
3274 | |
3275 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3276 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3277 | L2CAP_FCS_SIZE); | |
c8f79162 | 3278 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3279 | |
6327eb98 AE |
3280 | l2cap_txwin_setup(chan); |
3281 | ||
3282 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3283 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3284 | |
63406504 | 3285 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3286 | (unsigned long) &rfc); |
63406504 | 3287 | |
f89cef09 AE |
3288 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3289 | l2cap_add_opt_efs(&ptr, chan); | |
3290 | ||
6327eb98 AE |
3291 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3292 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3293 | chan->tx_win); |
60918918 AE |
3294 | |
3295 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3296 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3297 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3298 | chan->fcs = L2CAP_FCS_NONE; |
3299 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3300 | chan->fcs); | |
3301 | } | |
f2fcfcd6 GP |
3302 | break; |
3303 | ||
3304 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3305 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3306 | rfc.mode = L2CAP_MODE_STREAMING; |
3307 | rfc.txwin_size = 0; | |
3308 | rfc.max_transmit = 0; | |
3309 | rfc.retrans_timeout = 0; | |
3310 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3311 | |
3312 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3313 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3314 | L2CAP_FCS_SIZE); | |
c8f79162 | 3315 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3316 | |
63406504 | 3317 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3318 | (unsigned long) &rfc); |
63406504 | 3319 | |
f89cef09 AE |
3320 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3321 | l2cap_add_opt_efs(&ptr, chan); | |
3322 | ||
60918918 AE |
3323 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3324 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3325 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3326 | chan->fcs = L2CAP_FCS_NONE; |
3327 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3328 | chan->fcs); | |
3329 | } | |
65c7c491 MH |
3330 | break; |
3331 | } | |
1da177e4 | 3332 | |
fe4128e0 | 3333 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3334 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
3335 | |
3336 | return ptr - data; | |
3337 | } | |
3338 | ||
73ffa904 | 3339 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3340 | { |
5dee9e7c MH |
3341 | struct l2cap_conf_rsp *rsp = data; |
3342 | void *ptr = rsp->data; | |
73ffa904 GP |
3343 | void *req = chan->conf_req; |
3344 | int len = chan->conf_len; | |
5dee9e7c MH |
3345 | int type, hint, olen; |
3346 | unsigned long val; | |
6464f35f | 3347 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3348 | struct l2cap_conf_efs efs; |
3349 | u8 remote_efs = 0; | |
861d6882 | 3350 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3351 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3352 | u16 size; |
1da177e4 | 3353 | |
73ffa904 | 3354 | BT_DBG("chan %p", chan); |
820ae1b8 | 3355 | |
5dee9e7c MH |
3356 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3357 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3358 | |
589d2746 | 3359 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3360 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3361 | |
3362 | switch (type) { | |
3363 | case L2CAP_CONF_MTU: | |
861d6882 | 3364 | mtu = val; |
5dee9e7c MH |
3365 | break; |
3366 | ||
3367 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3368 | chan->flush_to = val; |
5dee9e7c MH |
3369 | break; |
3370 | ||
3371 | case L2CAP_CONF_QOS: | |
3372 | break; | |
3373 | ||
6464f35f MH |
3374 | case L2CAP_CONF_RFC: |
3375 | if (olen == sizeof(rfc)) | |
3376 | memcpy(&rfc, (void *) val, olen); | |
3377 | break; | |
3378 | ||
fcc203c3 GP |
3379 | case L2CAP_CONF_FCS: |
3380 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3381 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3382 | break; |
fcc203c3 | 3383 | |
42dceae2 AE |
3384 | case L2CAP_CONF_EFS: |
3385 | remote_efs = 1; | |
3386 | if (olen == sizeof(efs)) | |
3387 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3388 | break; |
3389 | ||
6327eb98 | 3390 | case L2CAP_CONF_EWS: |
848566b3 | 3391 | if (!chan->conn->hs_enabled) |
6327eb98 | 3392 | return -ECONNREFUSED; |
fcc203c3 | 3393 | |
6327eb98 AE |
3394 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3395 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3396 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3397 | chan->remote_tx_win = val; |
fcc203c3 GP |
3398 | break; |
3399 | ||
5dee9e7c MH |
3400 | default: |
3401 | if (hint) | |
3402 | break; | |
3403 | ||
3404 | result = L2CAP_CONF_UNKNOWN; | |
3405 | *((u8 *) ptr++) = type; | |
3406 | break; | |
3407 | } | |
3408 | } | |
3409 | ||
73ffa904 | 3410 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3411 | goto done; |
3412 | ||
0c1bc5c6 | 3413 | switch (chan->mode) { |
f2fcfcd6 GP |
3414 | case L2CAP_MODE_STREAMING: |
3415 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3416 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3417 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3418 | chan->conn->feat_mask); |
85eb53c6 GP |
3419 | break; |
3420 | } | |
3421 | ||
42dceae2 | 3422 | if (remote_efs) { |
848566b3 | 3423 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3424 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3425 | else | |
3426 | return -ECONNREFUSED; | |
3427 | } | |
3428 | ||
0c1bc5c6 | 3429 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3430 | return -ECONNREFUSED; |
742e519b | 3431 | |
f2fcfcd6 | 3432 | break; |
f2fcfcd6 GP |
3433 | } |
3434 | ||
3435 | done: | |
0c1bc5c6 | 3436 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3437 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3438 | rfc.mode = chan->mode; |
f2fcfcd6 | 3439 | |
73ffa904 | 3440 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3441 | return -ECONNREFUSED; |
3442 | ||
2d792818 GP |
3443 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3444 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3445 | } |
3446 | ||
5dee9e7c MH |
3447 | if (result == L2CAP_CONF_SUCCESS) { |
3448 | /* Configure output options and let the other side know | |
3449 | * which ones we don't like. */ | |
3450 | ||
f2fcfcd6 GP |
3451 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3452 | result = L2CAP_CONF_UNACCEPT; | |
3453 | else { | |
0c1bc5c6 | 3454 | chan->omtu = mtu; |
c1360a1c | 3455 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3456 | } |
0c1bc5c6 | 3457 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3458 | |
42dceae2 AE |
3459 | if (remote_efs) { |
3460 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3461 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3462 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3463 | |
3464 | result = L2CAP_CONF_UNACCEPT; | |
3465 | ||
3466 | if (chan->num_conf_req >= 1) | |
3467 | return -ECONNREFUSED; | |
3468 | ||
3469 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3470 | sizeof(efs), |
3471 | (unsigned long) &efs); | |
0e8b207e | 3472 | } else { |
3e6b3b95 | 3473 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3474 | result = L2CAP_CONF_PENDING; |
3475 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3476 | } |
3477 | } | |
3478 | ||
f2fcfcd6 GP |
3479 | switch (rfc.mode) { |
3480 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3481 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3482 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3483 | break; |
3484 | ||
3485 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3486 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3487 | chan->remote_tx_win = rfc.txwin_size; | |
3488 | else | |
3489 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3490 | |
2c03a7a4 | 3491 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3492 | |
c8f79162 | 3493 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3494 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3495 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3496 | rfc.max_pdu_size = cpu_to_le16(size); |
3497 | chan->remote_mps = size; | |
f2fcfcd6 | 3498 | |
36c86c85 | 3499 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3500 | |
c1360a1c | 3501 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3502 | |
3503 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3504 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3505 | |
42dceae2 AE |
3506 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3507 | chan->remote_id = efs.id; | |
3508 | chan->remote_stype = efs.stype; | |
3509 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3510 | chan->remote_flush_to = | |
2d792818 | 3511 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3512 | chan->remote_acc_lat = |
2d792818 | 3513 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3514 | chan->remote_sdu_itime = |
3515 | le32_to_cpu(efs.sdu_itime); | |
3516 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3517 | sizeof(efs), |
3518 | (unsigned long) &efs); | |
42dceae2 | 3519 | } |
f2fcfcd6 GP |
3520 | break; |
3521 | ||
3522 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3523 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3524 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3525 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3526 | rfc.max_pdu_size = cpu_to_le16(size); |
3527 | chan->remote_mps = size; | |
f2fcfcd6 | 3528 | |
c1360a1c | 3529 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3530 | |
2d792818 GP |
3531 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3532 | (unsigned long) &rfc); | |
68ae6639 | 3533 | |
f2fcfcd6 GP |
3534 | break; |
3535 | ||
3536 | default: | |
5dee9e7c | 3537 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3538 | |
6464f35f | 3539 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3540 | rfc.mode = chan->mode; |
f2fcfcd6 | 3541 | } |
6464f35f | 3542 | |
f2fcfcd6 | 3543 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3544 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3545 | } |
fe4128e0 | 3546 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3547 | rsp->result = cpu_to_le16(result); |
dcf4adbf | 3548 | rsp->flags = cpu_to_le16(0); |
5dee9e7c MH |
3549 | |
3550 | return ptr - data; | |
1da177e4 LT |
3551 | } |
3552 | ||
2d792818 GP |
3553 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3554 | void *data, u16 *result) | |
f2fcfcd6 | 3555 | { |
f2fcfcd6 GP |
3556 | struct l2cap_conf_req *req = data; |
3557 | void *ptr = req->data; | |
3558 | int type, olen; | |
3559 | unsigned long val; | |
36e999a8 | 3560 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3561 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3562 | |
fe4128e0 | 3563 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3564 | |
3565 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3566 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3567 | ||
3568 | switch (type) { | |
3569 | case L2CAP_CONF_MTU: | |
3570 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3571 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3572 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3573 | } else |
0c1bc5c6 GP |
3574 | chan->imtu = val; |
3575 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3576 | break; |
3577 | ||
3578 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3579 | chan->flush_to = val; |
f2fcfcd6 | 3580 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3581 | 2, chan->flush_to); |
f2fcfcd6 GP |
3582 | break; |
3583 | ||
3584 | case L2CAP_CONF_RFC: | |
3585 | if (olen == sizeof(rfc)) | |
3586 | memcpy(&rfc, (void *)val, olen); | |
3587 | ||
c1360a1c | 3588 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3589 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3590 | return -ECONNREFUSED; |
3591 | ||
47d1ec61 | 3592 | chan->fcs = 0; |
f2fcfcd6 GP |
3593 | |
3594 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3595 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3596 | break; |
6327eb98 AE |
3597 | |
3598 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3599 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3600 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3601 | chan->tx_win); |
6327eb98 | 3602 | break; |
66af7aaf AE |
3603 | |
3604 | case L2CAP_CONF_EFS: | |
3605 | if (olen == sizeof(efs)) | |
3606 | memcpy(&efs, (void *)val, olen); | |
3607 | ||
3608 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3609 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3610 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3611 | return -ECONNREFUSED; |
3612 | ||
2d792818 GP |
3613 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3614 | (unsigned long) &efs); | |
66af7aaf | 3615 | break; |
cbabee78 AE |
3616 | |
3617 | case L2CAP_CONF_FCS: | |
3618 | if (*result == L2CAP_CONF_PENDING) | |
3619 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3620 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3621 | &chan->conf_state); |
3622 | break; | |
f2fcfcd6 GP |
3623 | } |
3624 | } | |
3625 | ||
0c1bc5c6 | 3626 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3627 | return -ECONNREFUSED; |
3628 | ||
0c1bc5c6 | 3629 | chan->mode = rfc.mode; |
6c2ea7a8 | 3630 | |
0e8b207e | 3631 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3632 | switch (rfc.mode) { |
3633 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3634 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3635 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3636 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3637 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3638 | chan->ack_win = min_t(u16, chan->ack_win, | |
3639 | rfc.txwin_size); | |
66af7aaf AE |
3640 | |
3641 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3642 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3643 | chan->local_sdu_itime = | |
2d792818 | 3644 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3645 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3646 | chan->local_flush_to = | |
2d792818 | 3647 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3648 | } |
f2fcfcd6 | 3649 | break; |
66af7aaf | 3650 | |
f2fcfcd6 | 3651 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3652 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3653 | } |
3654 | } | |
3655 | ||
fe4128e0 | 3656 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3657 | req->flags = cpu_to_le16(0); |
f2fcfcd6 GP |
3658 | |
3659 | return ptr - data; | |
3660 | } | |
3661 | ||
2d792818 GP |
3662 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3663 | u16 result, u16 flags) | |
1da177e4 LT |
3664 | { |
3665 | struct l2cap_conf_rsp *rsp = data; | |
3666 | void *ptr = rsp->data; | |
1da177e4 | 3667 | |
fe4128e0 | 3668 | BT_DBG("chan %p", chan); |
1da177e4 | 3669 | |
fe4128e0 | 3670 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3671 | rsp->result = cpu_to_le16(result); |
aca3192c | 3672 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3673 | |
3674 | return ptr - data; | |
3675 | } | |
3676 | ||
27e2d4c8 JH |
3677 | void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) |
3678 | { | |
3679 | struct l2cap_le_conn_rsp rsp; | |
3680 | struct l2cap_conn *conn = chan->conn; | |
3681 | ||
3682 | BT_DBG("chan %p", chan); | |
3683 | ||
3684 | rsp.dcid = cpu_to_le16(chan->scid); | |
3685 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 3686 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 3687 | rsp.credits = cpu_to_le16(chan->rx_credits); |
dcf4adbf | 3688 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
27e2d4c8 JH |
3689 | |
3690 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
3691 | &rsp); | |
3692 | } | |
3693 | ||
8c1d787b | 3694 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3695 | { |
3696 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3697 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3698 | u8 buf[128]; |
439f34ac | 3699 | u8 rsp_code; |
710f9b0a | 3700 | |
fe4128e0 GP |
3701 | rsp.scid = cpu_to_le16(chan->dcid); |
3702 | rsp.dcid = cpu_to_le16(chan->scid); | |
dcf4adbf JP |
3703 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3704 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3705 | |
3706 | if (chan->hs_hcon) | |
3707 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3708 | else | |
3709 | rsp_code = L2CAP_CONN_RSP; | |
3710 | ||
3711 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3712 | ||
3713 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3714 | |
c1360a1c | 3715 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3716 | return; |
3717 | ||
710f9b0a | 3718 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3719 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3720 | chan->num_conf_req++; |
3721 | } | |
3722 | ||
47d1ec61 | 3723 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3724 | { |
7b1c0049 GP |
3725 | int type, olen; |
3726 | unsigned long val; | |
c20f8e35 MM |
3727 | /* Use sane default values in case a misbehaving remote device |
3728 | * did not send an RFC or extended window size option. | |
3729 | */ | |
3730 | u16 txwin_ext = chan->ack_win; | |
3731 | struct l2cap_conf_rfc rfc = { | |
3732 | .mode = chan->mode, | |
dcf4adbf JP |
3733 | .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), |
3734 | .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
c20f8e35 MM |
3735 | .max_pdu_size = cpu_to_le16(chan->imtu), |
3736 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3737 | }; | |
7b1c0049 | 3738 | |
47d1ec61 | 3739 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3740 | |
0c1bc5c6 | 3741 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3742 | return; |
3743 | ||
3744 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3745 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3746 | ||
c20f8e35 MM |
3747 | switch (type) { |
3748 | case L2CAP_CONF_RFC: | |
3749 | if (olen == sizeof(rfc)) | |
3750 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3751 | break; |
c20f8e35 MM |
3752 | case L2CAP_CONF_EWS: |
3753 | txwin_ext = val; | |
3754 | break; | |
3755 | } | |
7b1c0049 GP |
3756 | } |
3757 | ||
7b1c0049 GP |
3758 | switch (rfc.mode) { |
3759 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3760 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3761 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3762 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3763 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3764 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3765 | else | |
3766 | chan->ack_win = min_t(u16, chan->ack_win, | |
3767 | rfc.txwin_size); | |
7b1c0049 GP |
3768 | break; |
3769 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3770 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3771 | } |
3772 | } | |
3773 | ||
2d792818 | 3774 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3775 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3776 | u8 *data) | |
4e8402a3 | 3777 | { |
e2fd318e | 3778 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3779 | |
cb3b3152 JH |
3780 | if (cmd_len < sizeof(*rej)) |
3781 | return -EPROTO; | |
3782 | ||
e2fd318e | 3783 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3784 | return 0; |
3785 | ||
3786 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3787 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3788 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3789 | |
3790 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3791 | conn->info_ident = 0; |
984947dc | 3792 | |
4e8402a3 MH |
3793 | l2cap_conn_start(conn); |
3794 | } | |
3795 | ||
3796 | return 0; | |
3797 | } | |
3798 | ||
1700915f MM |
3799 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3800 | struct l2cap_cmd_hdr *cmd, | |
3801 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3802 | { |
1da177e4 LT |
3803 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3804 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3805 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3806 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3807 | |
3808 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3809 | __le16 psm = req->psm; |
1da177e4 | 3810 | |
097db76c | 3811 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3812 | |
3813 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3814 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
bf20fd4e | 3815 | &conn->hcon->dst, ACL_LINK); |
23691d75 | 3816 | if (!pchan) { |
1da177e4 LT |
3817 | result = L2CAP_CR_BAD_PSM; |
3818 | goto sendresp; | |
3819 | } | |
3820 | ||
3df91ea2 | 3821 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3822 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3823 | |
e7c29cb1 | 3824 | /* Check if the ACL is secure enough (if not SDP) */ |
dcf4adbf | 3825 | if (psm != cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3826 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3827 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3828 | result = L2CAP_CR_SEC_BLOCK; |
3829 | goto response; | |
3830 | } | |
3831 | ||
1da177e4 LT |
3832 | result = L2CAP_CR_NO_MEM; |
3833 | ||
2dfa1003 GP |
3834 | /* Check if we already have channel with that dcid */ |
3835 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3836 | goto response; | |
3837 | ||
80b98027 | 3838 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3839 | if (!chan) |
1da177e4 LT |
3840 | goto response; |
3841 | ||
330b6c15 SS |
3842 | /* For certain devices (ex: HID mouse), support for authentication, |
3843 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3844 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3845 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3846 | */ | |
3847 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3848 | ||
7eafc59e MH |
3849 | bacpy(&chan->src, &conn->hcon->src); |
3850 | bacpy(&chan->dst, &conn->hcon->dst); | |
4f1654e0 MH |
3851 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); |
3852 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
fe4128e0 GP |
3853 | chan->psm = psm; |
3854 | chan->dcid = scid; | |
1700915f | 3855 | chan->local_amp_id = amp_id; |
1da177e4 | 3856 | |
6be36555 | 3857 | __l2cap_chan_add(conn, chan); |
48454079 | 3858 | |
fe4128e0 | 3859 | dcid = chan->scid; |
1da177e4 | 3860 | |
8d836d71 | 3861 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3862 | |
fc7f8a7e | 3863 | chan->ident = cmd->ident; |
1da177e4 | 3864 | |
984947dc | 3865 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
e7cafc45 | 3866 | if (l2cap_chan_check_security(chan, false)) { |
bdc25783 | 3867 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3868 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3869 | result = L2CAP_CR_PEND; |
3870 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3871 | chan->ops->defer(chan); |
f66dc81f | 3872 | } else { |
1700915f MM |
3873 | /* Force pending result for AMP controllers. |
3874 | * The connection will succeed after the | |
3875 | * physical link is up. | |
3876 | */ | |
6ed971ca | 3877 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3878 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3879 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3880 | } else { |
f93fa273 | 3881 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3882 | result = L2CAP_CR_PEND; |
1700915f | 3883 | } |
f66dc81f MH |
3884 | status = L2CAP_CS_NO_INFO; |
3885 | } | |
79d554a6 | 3886 | } else { |
f93fa273 | 3887 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3888 | result = L2CAP_CR_PEND; |
3889 | status = L2CAP_CS_AUTHEN_PEND; | |
3890 | } | |
3891 | } else { | |
f93fa273 | 3892 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3893 | result = L2CAP_CR_PEND; |
3894 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3895 | } |
3896 | ||
1da177e4 | 3897 | response: |
8ffb9290 | 3898 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3899 | mutex_unlock(&conn->chan_lock); |
a24cce14 | 3900 | l2cap_chan_put(pchan); |
1da177e4 LT |
3901 | |
3902 | sendresp: | |
aca3192c YH |
3903 | rsp.scid = cpu_to_le16(scid); |
3904 | rsp.dcid = cpu_to_le16(dcid); | |
3905 | rsp.result = cpu_to_le16(result); | |
3906 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3907 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3908 | |
3909 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3910 | struct l2cap_info_req info; | |
dcf4adbf | 3911 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3912 | |
3913 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3914 | conn->info_ident = l2cap_get_ident(conn); | |
3915 | ||
ba13ccd9 | 3916 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3917 | |
2d792818 GP |
3918 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3919 | sizeof(info), &info); | |
79d554a6 MH |
3920 | } |
3921 | ||
c1360a1c | 3922 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3923 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3924 | u8 buf[128]; |
c1360a1c | 3925 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3926 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3927 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3928 | chan->num_conf_req++; |
e9aeb2dd | 3929 | } |
1700915f MM |
3930 | |
3931 | return chan; | |
4c89b6aa | 3932 | } |
e9aeb2dd | 3933 | |
4c89b6aa | 3934 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3935 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3936 | { |
7b064eda JK |
3937 | struct hci_dev *hdev = conn->hcon->hdev; |
3938 | struct hci_conn *hcon = conn->hcon; | |
3939 | ||
cb3b3152 JH |
3940 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3941 | return -EPROTO; | |
3942 | ||
7b064eda JK |
3943 | hci_dev_lock(hdev); |
3944 | if (test_bit(HCI_MGMT, &hdev->dev_flags) && | |
3945 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) | |
3946 | mgmt_device_connected(hdev, &hcon->dst, hcon->type, | |
3947 | hcon->dst_type, 0, NULL, 0, | |
3948 | hcon->dev_class); | |
3949 | hci_dev_unlock(hdev); | |
3950 | ||
300229f9 | 3951 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3952 | return 0; |
3953 | } | |
3954 | ||
5909cf30 | 3955 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3956 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3957 | u8 *data) | |
1da177e4 LT |
3958 | { |
3959 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3960 | u16 scid, dcid, result, status; | |
48454079 | 3961 | struct l2cap_chan *chan; |
1da177e4 | 3962 | u8 req[128]; |
3df91ea2 | 3963 | int err; |
1da177e4 | 3964 | |
cb3b3152 JH |
3965 | if (cmd_len < sizeof(*rsp)) |
3966 | return -EPROTO; | |
3967 | ||
1da177e4 LT |
3968 | scid = __le16_to_cpu(rsp->scid); |
3969 | dcid = __le16_to_cpu(rsp->dcid); | |
3970 | result = __le16_to_cpu(rsp->result); | |
3971 | status = __le16_to_cpu(rsp->status); | |
3972 | ||
1b009c98 | 3973 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3974 | dcid, scid, result, status); |
1da177e4 | 3975 | |
3df91ea2 AE |
3976 | mutex_lock(&conn->chan_lock); |
3977 | ||
1da177e4 | 3978 | if (scid) { |
3df91ea2 AE |
3979 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3980 | if (!chan) { | |
21870b52 | 3981 | err = -EBADSLT; |
3df91ea2 AE |
3982 | goto unlock; |
3983 | } | |
1da177e4 | 3984 | } else { |
3df91ea2 AE |
3985 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3986 | if (!chan) { | |
21870b52 | 3987 | err = -EBADSLT; |
3df91ea2 AE |
3988 | goto unlock; |
3989 | } | |
1da177e4 LT |
3990 | } |
3991 | ||
3df91ea2 AE |
3992 | err = 0; |
3993 | ||
6be36555 | 3994 | l2cap_chan_lock(chan); |
48454079 | 3995 | |
1da177e4 LT |
3996 | switch (result) { |
3997 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3998 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3999 | chan->ident = 0; |
fe4128e0 | 4000 | chan->dcid = dcid; |
c1360a1c | 4001 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 4002 | |
c1360a1c | 4003 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
4004 | break; |
4005 | ||
1da177e4 | 4006 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4007 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 4008 | chan->num_conf_req++; |
1da177e4 LT |
4009 | break; |
4010 | ||
4011 | case L2CAP_CR_PEND: | |
c1360a1c | 4012 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
4013 | break; |
4014 | ||
4015 | default: | |
48454079 | 4016 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
4017 | break; |
4018 | } | |
4019 | ||
6be36555 | 4020 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
4021 | |
4022 | unlock: | |
4023 | mutex_unlock(&conn->chan_lock); | |
4024 | ||
4025 | return err; | |
1da177e4 LT |
4026 | } |
4027 | ||
47d1ec61 | 4028 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
4029 | { |
4030 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
4031 | * sides request it. | |
4032 | */ | |
0c1bc5c6 | 4033 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 4034 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 4035 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 4036 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
4037 | } |
4038 | ||
29d8a590 AE |
4039 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
4040 | u8 ident, u16 flags) | |
4041 | { | |
4042 | struct l2cap_conn *conn = chan->conn; | |
4043 | ||
4044 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
4045 | flags); | |
4046 | ||
4047 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
4048 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
4049 | ||
4050 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
4051 | l2cap_build_conf_rsp(chan, data, | |
4052 | L2CAP_CONF_SUCCESS, flags), data); | |
4053 | } | |
4054 | ||
662d652d JH |
4055 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
4056 | u16 scid, u16 dcid) | |
4057 | { | |
4058 | struct l2cap_cmd_rej_cid rej; | |
4059 | ||
dcf4adbf | 4060 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); |
662d652d JH |
4061 | rej.scid = __cpu_to_le16(scid); |
4062 | rej.dcid = __cpu_to_le16(dcid); | |
4063 | ||
4064 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
4065 | } | |
4066 | ||
2d792818 GP |
4067 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
4068 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
4069 | u8 *data) | |
1da177e4 LT |
4070 | { |
4071 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
4072 | u16 dcid, flags; | |
4073 | u8 rsp[64]; | |
48454079 | 4074 | struct l2cap_chan *chan; |
3c588192 | 4075 | int len, err = 0; |
1da177e4 | 4076 | |
cb3b3152 JH |
4077 | if (cmd_len < sizeof(*req)) |
4078 | return -EPROTO; | |
4079 | ||
1da177e4 LT |
4080 | dcid = __le16_to_cpu(req->dcid); |
4081 | flags = __le16_to_cpu(req->flags); | |
4082 | ||
4083 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
4084 | ||
baa7e1fa | 4085 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
4086 | if (!chan) { |
4087 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
4088 | return 0; | |
4089 | } | |
1da177e4 | 4090 | |
033b1142 | 4091 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
4092 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4093 | chan->dcid); | |
354f60a9 | 4094 | goto unlock; |
df6bd743 | 4095 | } |
354f60a9 | 4096 | |
5dee9e7c | 4097 | /* Reject if config buffer is too small. */ |
88219a0f | 4098 | len = cmd_len - sizeof(*req); |
cb3b3152 | 4099 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4100 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4101 | l2cap_build_conf_rsp(chan, rsp, |
4102 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4103 | goto unlock; |
4104 | } | |
4105 | ||
4106 | /* Store config. */ | |
73ffa904 GP |
4107 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4108 | chan->conf_len += len; | |
1da177e4 | 4109 | |
59e54bd1 | 4110 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4111 | /* Incomplete config. Send empty response. */ |
4112 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4113 | l2cap_build_conf_rsp(chan, rsp, |
4114 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4115 | goto unlock; |
4116 | } | |
4117 | ||
4118 | /* Complete config. */ | |
73ffa904 | 4119 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4120 | if (len < 0) { |
5e4e3972 | 4121 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4122 | goto unlock; |
f2fcfcd6 | 4123 | } |
1da177e4 | 4124 | |
1500109b | 4125 | chan->ident = cmd->ident; |
5dee9e7c | 4126 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4127 | chan->num_conf_rsp++; |
5dee9e7c | 4128 | |
5dee9e7c | 4129 | /* Reset config buffer. */ |
73ffa904 | 4130 | chan->conf_len = 0; |
5dee9e7c | 4131 | |
c1360a1c | 4132 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4133 | goto unlock; |
4134 | ||
c1360a1c | 4135 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4136 | set_default_fcs(chan); |
fcc203c3 | 4137 | |
105bdf9e MM |
4138 | if (chan->mode == L2CAP_MODE_ERTM || |
4139 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4140 | err = l2cap_ertm_init(chan); |
4141 | ||
4142 | if (err < 0) | |
5e4e3972 | 4143 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4144 | else |
4145 | l2cap_chan_ready(chan); | |
0565c1c2 | 4146 | |
876d9484 MH |
4147 | goto unlock; |
4148 | } | |
4149 | ||
c1360a1c | 4150 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4151 | u8 buf[64]; |
1da177e4 | 4152 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4153 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4154 | chan->num_conf_req++; |
1da177e4 LT |
4155 | } |
4156 | ||
0e8b207e AE |
4157 | /* Got Conf Rsp PENDING from remote side and asume we sent |
4158 | Conf Rsp PENDING in the code above */ | |
4159 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4160 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4161 | |
4162 | /* check compatibility */ | |
4163 | ||
79de886d | 4164 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4165 | if (!chan->hs_hcon) |
79de886d AE |
4166 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4167 | else | |
4168 | chan->ident = cmd->ident; | |
0e8b207e AE |
4169 | } |
4170 | ||
1da177e4 | 4171 | unlock: |
6be36555 | 4172 | l2cap_chan_unlock(chan); |
3c588192 | 4173 | return err; |
1da177e4 LT |
4174 | } |
4175 | ||
2d792818 | 4176 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4177 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4178 | u8 *data) | |
1da177e4 LT |
4179 | { |
4180 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4181 | u16 scid, flags, result; | |
48454079 | 4182 | struct l2cap_chan *chan; |
cb3b3152 | 4183 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4184 | int err = 0; |
1da177e4 | 4185 | |
cb3b3152 JH |
4186 | if (cmd_len < sizeof(*rsp)) |
4187 | return -EPROTO; | |
4188 | ||
1da177e4 LT |
4189 | scid = __le16_to_cpu(rsp->scid); |
4190 | flags = __le16_to_cpu(rsp->flags); | |
4191 | result = __le16_to_cpu(rsp->result); | |
4192 | ||
61386cba AE |
4193 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4194 | result, len); | |
1da177e4 | 4195 | |
baa7e1fa | 4196 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4197 | if (!chan) |
1da177e4 LT |
4198 | return 0; |
4199 | ||
4200 | switch (result) { | |
4201 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4202 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4203 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4204 | break; |
4205 | ||
0e8b207e AE |
4206 | case L2CAP_CONF_PENDING: |
4207 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4208 | ||
4209 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4210 | char buf[64]; | |
4211 | ||
4212 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4213 | buf, &result); |
0e8b207e | 4214 | if (len < 0) { |
5e4e3972 | 4215 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4216 | goto done; |
4217 | } | |
4218 | ||
f351bc72 | 4219 | if (!chan->hs_hcon) { |
79de886d AE |
4220 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4221 | 0); | |
5ce66b59 AE |
4222 | } else { |
4223 | if (l2cap_check_efs(chan)) { | |
4224 | amp_create_logical_link(chan); | |
4225 | chan->ident = cmd->ident; | |
4226 | } | |
4227 | } | |
0e8b207e AE |
4228 | } |
4229 | goto done; | |
4230 | ||
1da177e4 | 4231 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4232 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4233 | char req[64]; |
4234 | ||
c2c77ec8 | 4235 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4236 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4237 | goto done; |
4238 | } | |
4239 | ||
f2fcfcd6 GP |
4240 | /* throw out any old stored conf requests */ |
4241 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4242 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4243 | req, &result); |
f2fcfcd6 | 4244 | if (len < 0) { |
5e4e3972 | 4245 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4246 | goto done; |
4247 | } | |
4248 | ||
4249 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4250 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4251 | chan->num_conf_req++; |
f2fcfcd6 GP |
4252 | if (result != L2CAP_CONF_SUCCESS) |
4253 | goto done; | |
4254 | break; | |
1da177e4 LT |
4255 | } |
4256 | ||
8e87d142 | 4257 | default: |
6be36555 | 4258 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4259 | |
ba13ccd9 | 4260 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4261 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4262 | goto done; |
4263 | } | |
4264 | ||
59e54bd1 | 4265 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4266 | goto done; |
4267 | ||
c1360a1c | 4268 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4269 | |
c1360a1c | 4270 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4271 | set_default_fcs(chan); |
fcc203c3 | 4272 | |
105bdf9e MM |
4273 | if (chan->mode == L2CAP_MODE_ERTM || |
4274 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4275 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4276 | |
3c588192 | 4277 | if (err < 0) |
5e4e3972 | 4278 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4279 | else |
4280 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4281 | } |
4282 | ||
4283 | done: | |
6be36555 | 4284 | l2cap_chan_unlock(chan); |
3c588192 | 4285 | return err; |
1da177e4 LT |
4286 | } |
4287 | ||
2d792818 | 4288 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4289 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4290 | u8 *data) | |
1da177e4 LT |
4291 | { |
4292 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4293 | struct l2cap_disconn_rsp rsp; | |
4294 | u16 dcid, scid; | |
48454079 | 4295 | struct l2cap_chan *chan; |
1da177e4 | 4296 | |
cb3b3152 JH |
4297 | if (cmd_len != sizeof(*req)) |
4298 | return -EPROTO; | |
4299 | ||
1da177e4 LT |
4300 | scid = __le16_to_cpu(req->scid); |
4301 | dcid = __le16_to_cpu(req->dcid); | |
4302 | ||
4303 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4304 | ||
3df91ea2 AE |
4305 | mutex_lock(&conn->chan_lock); |
4306 | ||
4307 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4308 | if (!chan) { | |
4309 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4310 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4311 | return 0; | |
3df91ea2 | 4312 | } |
1da177e4 | 4313 | |
6be36555 AE |
4314 | l2cap_chan_lock(chan); |
4315 | ||
fe4128e0 GP |
4316 | rsp.dcid = cpu_to_le16(chan->scid); |
4317 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4318 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4319 | ||
5ec1bbe5 | 4320 | chan->ops->set_shutdown(chan); |
1da177e4 | 4321 | |
61d6ef3e | 4322 | l2cap_chan_hold(chan); |
48454079 | 4323 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4324 | |
4325 | l2cap_chan_unlock(chan); | |
1da177e4 | 4326 | |
80b98027 | 4327 | chan->ops->close(chan); |
61d6ef3e | 4328 | l2cap_chan_put(chan); |
3df91ea2 AE |
4329 | |
4330 | mutex_unlock(&conn->chan_lock); | |
4331 | ||
1da177e4 LT |
4332 | return 0; |
4333 | } | |
4334 | ||
2d792818 | 4335 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4336 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4337 | u8 *data) | |
1da177e4 LT |
4338 | { |
4339 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4340 | u16 dcid, scid; | |
48454079 | 4341 | struct l2cap_chan *chan; |
1da177e4 | 4342 | |
cb3b3152 JH |
4343 | if (cmd_len != sizeof(*rsp)) |
4344 | return -EPROTO; | |
4345 | ||
1da177e4 LT |
4346 | scid = __le16_to_cpu(rsp->scid); |
4347 | dcid = __le16_to_cpu(rsp->dcid); | |
4348 | ||
4349 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4350 | ||
3df91ea2 AE |
4351 | mutex_lock(&conn->chan_lock); |
4352 | ||
4353 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4354 | if (!chan) { | |
4355 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4356 | return 0; |
3df91ea2 | 4357 | } |
1da177e4 | 4358 | |
6be36555 | 4359 | l2cap_chan_lock(chan); |
48454079 | 4360 | |
61d6ef3e | 4361 | l2cap_chan_hold(chan); |
48454079 | 4362 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4363 | |
4364 | l2cap_chan_unlock(chan); | |
1da177e4 | 4365 | |
80b98027 | 4366 | chan->ops->close(chan); |
61d6ef3e | 4367 | l2cap_chan_put(chan); |
3df91ea2 AE |
4368 | |
4369 | mutex_unlock(&conn->chan_lock); | |
4370 | ||
1da177e4 LT |
4371 | return 0; |
4372 | } | |
4373 | ||
2d792818 | 4374 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4375 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4376 | u8 *data) | |
1da177e4 LT |
4377 | { |
4378 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4379 | u16 type; |
4380 | ||
cb3b3152 JH |
4381 | if (cmd_len != sizeof(*req)) |
4382 | return -EPROTO; | |
4383 | ||
1da177e4 LT |
4384 | type = __le16_to_cpu(req->type); |
4385 | ||
4386 | BT_DBG("type 0x%4.4x", type); | |
4387 | ||
f0709e03 MH |
4388 | if (type == L2CAP_IT_FEAT_MASK) { |
4389 | u8 buf[8]; | |
44dd46de | 4390 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4391 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
dcf4adbf JP |
4392 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4393 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4394 | if (!disable_ertm) |
fcc203c3 | 4395 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4396 | | L2CAP_FEAT_FCS; |
848566b3 | 4397 | if (conn->hs_enabled) |
6327eb98 | 4398 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4399 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4400 | |
1b7bf4ed | 4401 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4402 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4403 | buf); | |
e1027a7c MH |
4404 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4405 | u8 buf[12]; | |
4406 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4407 | |
848566b3 | 4408 | if (conn->hs_enabled) |
50a147cd MM |
4409 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; |
4410 | else | |
4411 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4412 | ||
dcf4adbf JP |
4413 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4414 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4415 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4416 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4417 | buf); | |
f0709e03 MH |
4418 | } else { |
4419 | struct l2cap_info_rsp rsp; | |
4420 | rsp.type = cpu_to_le16(type); | |
dcf4adbf | 4421 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4422 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4423 | &rsp); | |
f0709e03 | 4424 | } |
1da177e4 LT |
4425 | |
4426 | return 0; | |
4427 | } | |
4428 | ||
2d792818 | 4429 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4430 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4431 | u8 *data) | |
1da177e4 LT |
4432 | { |
4433 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4434 | u16 type, result; | |
4435 | ||
3f6fa3d4 | 4436 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4437 | return -EPROTO; |
4438 | ||
1da177e4 LT |
4439 | type = __le16_to_cpu(rsp->type); |
4440 | result = __le16_to_cpu(rsp->result); | |
4441 | ||
4442 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4443 | ||
e90165be AE |
4444 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4445 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4446 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4447 | return 0; |
4448 | ||
17cd3f37 | 4449 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4450 | |
adb08ede VT |
4451 | if (result != L2CAP_IR_SUCCESS) { |
4452 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4453 | conn->info_ident = 0; | |
4454 | ||
4455 | l2cap_conn_start(conn); | |
4456 | ||
4457 | return 0; | |
4458 | } | |
4459 | ||
978c93b9 AE |
4460 | switch (type) { |
4461 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4462 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4463 | |
47ec1dcd | 4464 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4465 | struct l2cap_info_req req; |
dcf4adbf | 4466 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4467 | |
4468 | conn->info_ident = l2cap_get_ident(conn); | |
4469 | ||
4470 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4471 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4472 | } else { |
4473 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4474 | conn->info_ident = 0; | |
4475 | ||
4476 | l2cap_conn_start(conn); | |
4477 | } | |
978c93b9 AE |
4478 | break; |
4479 | ||
4480 | case L2CAP_IT_FIXED_CHAN: | |
4481 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4482 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4483 | conn->info_ident = 0; |
984947dc MH |
4484 | |
4485 | l2cap_conn_start(conn); | |
978c93b9 | 4486 | break; |
984947dc | 4487 | } |
4e8402a3 | 4488 | |
1da177e4 LT |
4489 | return 0; |
4490 | } | |
4491 | ||
1700915f MM |
4492 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4493 | struct l2cap_cmd_hdr *cmd, | |
4494 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4495 | { |
4496 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4497 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4498 | struct l2cap_chan *chan; |
6e1df6a6 | 4499 | struct hci_dev *hdev; |
f94ff6ff MM |
4500 | u16 psm, scid; |
4501 | ||
4502 | if (cmd_len != sizeof(*req)) | |
4503 | return -EPROTO; | |
4504 | ||
848566b3 | 4505 | if (!conn->hs_enabled) |
f94ff6ff MM |
4506 | return -EINVAL; |
4507 | ||
4508 | psm = le16_to_cpu(req->psm); | |
4509 | scid = le16_to_cpu(req->scid); | |
4510 | ||
ad0ac6ca | 4511 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4512 | |
6e1df6a6 | 4513 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4514 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4515 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4516 | req->amp_id); | |
4517 | return 0; | |
4518 | } | |
1700915f | 4519 | |
6e1df6a6 AE |
4520 | /* Validate AMP controller id */ |
4521 | hdev = hci_dev_get(req->amp_id); | |
4522 | if (!hdev) | |
4523 | goto error; | |
1700915f | 4524 | |
6e1df6a6 AE |
4525 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4526 | hci_dev_put(hdev); | |
4527 | goto error; | |
4528 | } | |
1700915f | 4529 | |
6e1df6a6 AE |
4530 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4531 | req->amp_id); | |
4532 | if (chan) { | |
4533 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4534 | struct hci_conn *hs_hcon; | |
1700915f | 4535 | |
98e0f7ea MH |
4536 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4537 | &conn->hcon->dst); | |
6e1df6a6 AE |
4538 | if (!hs_hcon) { |
4539 | hci_dev_put(hdev); | |
662d652d JH |
4540 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4541 | chan->dcid); | |
4542 | return 0; | |
1700915f MM |
4543 | } |
4544 | ||
6e1df6a6 AE |
4545 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4546 | ||
6e1df6a6 AE |
4547 | mgr->bredr_chan = chan; |
4548 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4549 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4550 | conn->mtu = hdev->block_mtu; |
1700915f | 4551 | } |
f94ff6ff | 4552 | |
6e1df6a6 | 4553 | hci_dev_put(hdev); |
f94ff6ff MM |
4554 | |
4555 | return 0; | |
6e1df6a6 AE |
4556 | |
4557 | error: | |
4558 | rsp.dcid = 0; | |
4559 | rsp.scid = cpu_to_le16(scid); | |
dcf4adbf JP |
4560 | rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); |
4561 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
6e1df6a6 AE |
4562 | |
4563 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4564 | sizeof(rsp), &rsp); | |
4565 | ||
dc280801 | 4566 | return 0; |
f94ff6ff MM |
4567 | } |
4568 | ||
8eb200bd MM |
4569 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4570 | { | |
4571 | struct l2cap_move_chan_req req; | |
4572 | u8 ident; | |
4573 | ||
4574 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4575 | ||
4576 | ident = l2cap_get_ident(chan->conn); | |
4577 | chan->ident = ident; | |
4578 | ||
4579 | req.icid = cpu_to_le16(chan->scid); | |
4580 | req.dest_amp_id = dest_amp_id; | |
4581 | ||
4582 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4583 | &req); | |
4584 | ||
4585 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4586 | } | |
4587 | ||
1500109b | 4588 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4589 | { |
4590 | struct l2cap_move_chan_rsp rsp; | |
4591 | ||
1500109b | 4592 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4593 | |
1500109b | 4594 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4595 | rsp.result = cpu_to_le16(result); |
4596 | ||
1500109b MM |
4597 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4598 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4599 | } |
4600 | ||
5b155ef9 | 4601 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4602 | { |
4603 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4604 | |
5b155ef9 | 4605 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4606 | |
5b155ef9 | 4607 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4608 | |
5b155ef9 | 4609 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4610 | cfm.result = cpu_to_le16(result); |
4611 | ||
5b155ef9 MM |
4612 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4613 | sizeof(cfm), &cfm); | |
4614 | ||
4615 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4616 | } | |
4617 | ||
4618 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4619 | { | |
4620 | struct l2cap_move_chan_cfm cfm; | |
4621 | ||
4622 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4623 | ||
4624 | cfm.icid = cpu_to_le16(icid); | |
dcf4adbf | 4625 | cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); |
5b155ef9 MM |
4626 | |
4627 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4628 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4629 | } |
4630 | ||
4631 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4632 | u16 icid) |
8d5a04a1 MM |
4633 | { |
4634 | struct l2cap_move_chan_cfm_rsp rsp; | |
4635 | ||
ad0ac6ca | 4636 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4637 | |
4638 | rsp.icid = cpu_to_le16(icid); | |
4639 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4640 | } | |
4641 | ||
5f3847a4 MM |
4642 | static void __release_logical_link(struct l2cap_chan *chan) |
4643 | { | |
4644 | chan->hs_hchan = NULL; | |
4645 | chan->hs_hcon = NULL; | |
4646 | ||
4647 | /* Placeholder - release the logical link */ | |
4648 | } | |
4649 | ||
1500109b MM |
4650 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4651 | { | |
4652 | /* Logical link setup failed */ | |
4653 | if (chan->state != BT_CONNECTED) { | |
4654 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4655 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4656 | return; |
4657 | } | |
4658 | ||
4659 | switch (chan->move_role) { | |
4660 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4661 | l2cap_move_done(chan); | |
4662 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4663 | break; | |
4664 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4665 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4666 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4667 | /* Remote has only sent pending or | |
4668 | * success responses, clean up | |
4669 | */ | |
4670 | l2cap_move_done(chan); | |
4671 | } | |
4672 | ||
4673 | /* Other amp move states imply that the move | |
4674 | * has already aborted | |
4675 | */ | |
4676 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4677 | break; | |
4678 | } | |
4679 | } | |
4680 | ||
4681 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4682 | struct hci_chan *hchan) | |
4683 | { | |
4684 | struct l2cap_conf_rsp rsp; | |
1500109b | 4685 | |
336178a3 | 4686 | chan->hs_hchan = hchan; |
1500109b MM |
4687 | chan->hs_hcon->l2cap_data = chan->conn; |
4688 | ||
35ba9561 | 4689 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4690 | |
4691 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4692 | int err; |
1500109b MM |
4693 | |
4694 | set_default_fcs(chan); | |
4695 | ||
4696 | err = l2cap_ertm_init(chan); | |
4697 | if (err < 0) | |
5e4e3972 | 4698 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4699 | else |
4700 | l2cap_chan_ready(chan); | |
4701 | } | |
4702 | } | |
4703 | ||
4704 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4705 | struct hci_chan *hchan) | |
4706 | { | |
4707 | chan->hs_hcon = hchan->conn; | |
4708 | chan->hs_hcon->l2cap_data = chan->conn; | |
4709 | ||
4710 | BT_DBG("move_state %d", chan->move_state); | |
4711 | ||
4712 | switch (chan->move_state) { | |
4713 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4714 | /* Move confirm will be sent after a success | |
4715 | * response is received | |
4716 | */ | |
4717 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4718 | break; | |
4719 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4720 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4721 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4722 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4723 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4724 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4725 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4726 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4727 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4728 | } | |
4729 | break; | |
4730 | default: | |
4731 | /* Move was not in expected state, free the channel */ | |
4732 | __release_logical_link(chan); | |
4733 | ||
4734 | chan->move_state = L2CAP_MOVE_STABLE; | |
4735 | } | |
4736 | } | |
4737 | ||
4738 | /* Call with chan locked */ | |
27695fb4 AE |
4739 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4740 | u8 status) | |
5b155ef9 | 4741 | { |
1500109b MM |
4742 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4743 | ||
4744 | if (status) { | |
4745 | l2cap_logical_fail(chan); | |
4746 | __release_logical_link(chan); | |
4747 | return; | |
4748 | } | |
4749 | ||
4750 | if (chan->state != BT_CONNECTED) { | |
4751 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4752 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4753 | l2cap_logical_finish_create(chan, hchan); |
4754 | } else { | |
4755 | l2cap_logical_finish_move(chan, hchan); | |
4756 | } | |
5b155ef9 MM |
4757 | } |
4758 | ||
3f7a56c4 MM |
4759 | void l2cap_move_start(struct l2cap_chan *chan) |
4760 | { | |
4761 | BT_DBG("chan %p", chan); | |
4762 | ||
6ed971ca | 4763 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4764 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4765 | return; | |
4766 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4767 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4768 | /* Placeholder - start physical link setup */ | |
4769 | } else { | |
4770 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4771 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4772 | chan->move_id = 0; | |
4773 | l2cap_move_setup(chan); | |
4774 | l2cap_send_move_chan_req(chan, 0); | |
4775 | } | |
4776 | } | |
4777 | ||
8eb200bd MM |
4778 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4779 | u8 local_amp_id, u8 remote_amp_id) | |
4780 | { | |
62748ca1 AE |
4781 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4782 | local_amp_id, remote_amp_id); | |
4783 | ||
12d6cc60 AE |
4784 | chan->fcs = L2CAP_FCS_NONE; |
4785 | ||
62748ca1 AE |
4786 | /* Outgoing channel on AMP */ |
4787 | if (chan->state == BT_CONNECT) { | |
4788 | if (result == L2CAP_CR_SUCCESS) { | |
4789 | chan->local_amp_id = local_amp_id; | |
4790 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4791 | } else { | |
4792 | /* Revert to BR/EDR connect */ | |
4793 | l2cap_send_conn_req(chan); | |
4794 | } | |
4795 | ||
4796 | return; | |
4797 | } | |
4798 | ||
4799 | /* Incoming channel on AMP */ | |
4800 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4801 | struct l2cap_conn_rsp rsp; |
4802 | char buf[128]; | |
4803 | rsp.scid = cpu_to_le16(chan->dcid); | |
4804 | rsp.dcid = cpu_to_le16(chan->scid); | |
4805 | ||
8eb200bd MM |
4806 | if (result == L2CAP_CR_SUCCESS) { |
4807 | /* Send successful response */ | |
dcf4adbf JP |
4808 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
4809 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4810 | } else { |
4811 | /* Send negative response */ | |
dcf4adbf JP |
4812 | rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); |
4813 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4814 | } |
4815 | ||
4816 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4817 | sizeof(rsp), &rsp); | |
4818 | ||
4819 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4820 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4821 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4822 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4823 | L2CAP_CONF_REQ, | |
4824 | l2cap_build_conf_req(chan, buf), buf); | |
4825 | chan->num_conf_req++; | |
4826 | } | |
8eb200bd MM |
4827 | } |
4828 | } | |
4829 | ||
4830 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4831 | u8 remote_amp_id) | |
4832 | { | |
4833 | l2cap_move_setup(chan); | |
4834 | chan->move_id = local_amp_id; | |
4835 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4836 | ||
4837 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4838 | } | |
4839 | ||
4840 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4841 | { | |
4842 | struct hci_chan *hchan = NULL; | |
4843 | ||
4844 | /* Placeholder - get hci_chan for logical link */ | |
4845 | ||
4846 | if (hchan) { | |
4847 | if (hchan->state == BT_CONNECTED) { | |
4848 | /* Logical link is ready to go */ | |
4849 | chan->hs_hcon = hchan->conn; | |
4850 | chan->hs_hcon->l2cap_data = chan->conn; | |
4851 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4852 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4853 | ||
4854 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4855 | } else { | |
4856 | /* Wait for logical link to be ready */ | |
4857 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4858 | } | |
4859 | } else { | |
4860 | /* Logical link not available */ | |
4861 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4862 | } | |
4863 | } | |
4864 | ||
4865 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4866 | { | |
4867 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4868 | u8 rsp_result; | |
4869 | if (result == -EINVAL) | |
4870 | rsp_result = L2CAP_MR_BAD_ID; | |
4871 | else | |
4872 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4873 | ||
4874 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4875 | } | |
4876 | ||
4877 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4878 | chan->move_state = L2CAP_MOVE_STABLE; | |
4879 | ||
4880 | /* Restart data transmission */ | |
4881 | l2cap_ertm_send(chan); | |
4882 | } | |
4883 | ||
a514b17f AE |
4884 | /* Invoke with locked chan */ |
4885 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4886 | { |
770bfefa | 4887 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4888 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4889 | |
8eb200bd MM |
4890 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4891 | chan, result, local_amp_id, remote_amp_id); | |
4892 | ||
8eb200bd MM |
4893 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4894 | l2cap_chan_unlock(chan); | |
4895 | return; | |
4896 | } | |
4897 | ||
4898 | if (chan->state != BT_CONNECTED) { | |
4899 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4900 | } else if (result != L2CAP_MR_SUCCESS) { | |
4901 | l2cap_do_move_cancel(chan, result); | |
4902 | } else { | |
4903 | switch (chan->move_role) { | |
4904 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4905 | l2cap_do_move_initiate(chan, local_amp_id, | |
4906 | remote_amp_id); | |
4907 | break; | |
4908 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4909 | l2cap_do_move_respond(chan, result); | |
4910 | break; | |
4911 | default: | |
4912 | l2cap_do_move_cancel(chan, result); | |
4913 | break; | |
4914 | } | |
4915 | } | |
8eb200bd MM |
4916 | } |
4917 | ||
8d5a04a1 | 4918 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4919 | struct l2cap_cmd_hdr *cmd, |
4920 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4921 | { |
4922 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4923 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4924 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4925 | u16 icid = 0; |
4926 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4927 | ||
4928 | if (cmd_len != sizeof(*req)) | |
4929 | return -EPROTO; | |
4930 | ||
4931 | icid = le16_to_cpu(req->icid); | |
4932 | ||
ad0ac6ca | 4933 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4934 | |
848566b3 | 4935 | if (!conn->hs_enabled) |
8d5a04a1 MM |
4936 | return -EINVAL; |
4937 | ||
02b0fbb9 MM |
4938 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4939 | if (!chan) { | |
1500109b | 4940 | rsp.icid = cpu_to_le16(icid); |
dcf4adbf | 4941 | rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); |
1500109b MM |
4942 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, |
4943 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4944 | return 0; |
4945 | } | |
4946 | ||
1500109b MM |
4947 | chan->ident = cmd->ident; |
4948 | ||
02b0fbb9 MM |
4949 | if (chan->scid < L2CAP_CID_DYN_START || |
4950 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4951 | (chan->mode != L2CAP_MODE_ERTM && | |
4952 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4953 | result = L2CAP_MR_NOT_ALLOWED; | |
4954 | goto send_move_response; | |
4955 | } | |
4956 | ||
4957 | if (chan->local_amp_id == req->dest_amp_id) { | |
4958 | result = L2CAP_MR_SAME_ID; | |
4959 | goto send_move_response; | |
4960 | } | |
4961 | ||
6ed971ca | 4962 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4963 | struct hci_dev *hdev; |
4964 | hdev = hci_dev_get(req->dest_amp_id); | |
4965 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4966 | !test_bit(HCI_UP, &hdev->flags)) { | |
4967 | if (hdev) | |
4968 | hci_dev_put(hdev); | |
4969 | ||
4970 | result = L2CAP_MR_BAD_ID; | |
4971 | goto send_move_response; | |
4972 | } | |
4973 | hci_dev_put(hdev); | |
4974 | } | |
4975 | ||
4976 | /* Detect a move collision. Only send a collision response | |
4977 | * if this side has "lost", otherwise proceed with the move. | |
4978 | * The winner has the larger bd_addr. | |
4979 | */ | |
4980 | if ((__chan_is_moving(chan) || | |
4981 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4982 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4983 | result = L2CAP_MR_COLLISION; |
4984 | goto send_move_response; | |
4985 | } | |
4986 | ||
02b0fbb9 MM |
4987 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4988 | l2cap_move_setup(chan); | |
4989 | chan->move_id = req->dest_amp_id; | |
4990 | icid = chan->dcid; | |
4991 | ||
6ed971ca | 4992 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4993 | /* Moving to BR/EDR */ |
4994 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4995 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4996 | result = L2CAP_MR_PEND; | |
4997 | } else { | |
4998 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4999 | result = L2CAP_MR_SUCCESS; | |
5000 | } | |
5001 | } else { | |
5002 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
5003 | /* Placeholder - uncomment when amp functions are available */ | |
5004 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
5005 | result = L2CAP_MR_PEND; | |
5006 | } | |
5007 | ||
5008 | send_move_response: | |
1500109b | 5009 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 5010 | |
02b0fbb9 MM |
5011 | l2cap_chan_unlock(chan); |
5012 | ||
8d5a04a1 MM |
5013 | return 0; |
5014 | } | |
5015 | ||
5b155ef9 MM |
5016 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
5017 | { | |
5018 | struct l2cap_chan *chan; | |
5019 | struct hci_chan *hchan = NULL; | |
5020 | ||
5021 | chan = l2cap_get_chan_by_scid(conn, icid); | |
5022 | if (!chan) { | |
5023 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5024 | return; | |
5025 | } | |
5026 | ||
5027 | __clear_chan_timer(chan); | |
5028 | if (result == L2CAP_MR_PEND) | |
5029 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
5030 | ||
5031 | switch (chan->move_state) { | |
5032 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
5033 | /* Move confirm will be sent when logical link | |
5034 | * is complete. | |
5035 | */ | |
5036 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
5037 | break; | |
5038 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
5039 | if (result == L2CAP_MR_PEND) { | |
5040 | break; | |
5041 | } else if (test_bit(CONN_LOCAL_BUSY, | |
5042 | &chan->conn_state)) { | |
5043 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
5044 | } else { | |
5045 | /* Logical link is up or moving to BR/EDR, | |
5046 | * proceed with move | |
5047 | */ | |
5048 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
5049 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5050 | } | |
5051 | break; | |
5052 | case L2CAP_MOVE_WAIT_RSP: | |
5053 | /* Moving to AMP */ | |
5054 | if (result == L2CAP_MR_SUCCESS) { | |
5055 | /* Remote is ready, send confirm immediately | |
5056 | * after logical link is ready | |
5057 | */ | |
5058 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
5059 | } else { | |
5060 | /* Both logical link and move success | |
5061 | * are required to confirm | |
5062 | */ | |
5063 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
5064 | } | |
5065 | ||
5066 | /* Placeholder - get hci_chan for logical link */ | |
5067 | if (!hchan) { | |
5068 | /* Logical link not available */ | |
5069 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5070 | break; | |
5071 | } | |
5072 | ||
5073 | /* If the logical link is not yet connected, do not | |
5074 | * send confirmation. | |
5075 | */ | |
5076 | if (hchan->state != BT_CONNECTED) | |
5077 | break; | |
5078 | ||
5079 | /* Logical link is already ready to go */ | |
5080 | ||
5081 | chan->hs_hcon = hchan->conn; | |
5082 | chan->hs_hcon->l2cap_data = chan->conn; | |
5083 | ||
5084 | if (result == L2CAP_MR_SUCCESS) { | |
5085 | /* Can confirm now */ | |
5086 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5087 | } else { | |
5088 | /* Now only need move success | |
5089 | * to confirm | |
5090 | */ | |
5091 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
5092 | } | |
5093 | ||
5094 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
5095 | break; | |
5096 | default: | |
5097 | /* Any other amp move state means the move failed. */ | |
5098 | chan->move_id = chan->local_amp_id; | |
5099 | l2cap_move_done(chan); | |
5100 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5101 | } | |
5102 | ||
5103 | l2cap_chan_unlock(chan); | |
5104 | } | |
5105 | ||
5106 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5107 | u16 result) | |
5108 | { | |
5109 | struct l2cap_chan *chan; | |
5110 | ||
5111 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5112 | if (!chan) { | |
5113 | /* Could not locate channel, icid is best guess */ | |
5114 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5115 | return; | |
5116 | } | |
5117 | ||
5118 | __clear_chan_timer(chan); | |
5119 | ||
5120 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5121 | if (result == L2CAP_MR_COLLISION) { | |
5122 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5123 | } else { | |
5124 | /* Cleanup - cancel move */ | |
5125 | chan->move_id = chan->local_amp_id; | |
5126 | l2cap_move_done(chan); | |
5127 | } | |
5128 | } | |
5129 | ||
5130 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5131 | ||
5132 | l2cap_chan_unlock(chan); | |
5133 | } | |
5134 | ||
5135 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5136 | struct l2cap_cmd_hdr *cmd, | |
5137 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5138 | { |
5139 | struct l2cap_move_chan_rsp *rsp = data; | |
5140 | u16 icid, result; | |
5141 | ||
5142 | if (cmd_len != sizeof(*rsp)) | |
5143 | return -EPROTO; | |
5144 | ||
5145 | icid = le16_to_cpu(rsp->icid); | |
5146 | result = le16_to_cpu(rsp->result); | |
5147 | ||
ad0ac6ca | 5148 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5149 | |
5b155ef9 MM |
5150 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5151 | l2cap_move_continue(conn, icid, result); | |
5152 | else | |
5153 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5154 | |
5155 | return 0; | |
5156 | } | |
5157 | ||
5f3847a4 MM |
5158 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5159 | struct l2cap_cmd_hdr *cmd, | |
5160 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5161 | { |
5162 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5163 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5164 | u16 icid, result; |
5165 | ||
5166 | if (cmd_len != sizeof(*cfm)) | |
5167 | return -EPROTO; | |
5168 | ||
5169 | icid = le16_to_cpu(cfm->icid); | |
5170 | result = le16_to_cpu(cfm->result); | |
5171 | ||
ad0ac6ca | 5172 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5173 | |
5f3847a4 MM |
5174 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5175 | if (!chan) { | |
5176 | /* Spec requires a response even if the icid was not found */ | |
5177 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5178 | return 0; | |
5179 | } | |
5180 | ||
5181 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5182 | if (result == L2CAP_MC_CONFIRMED) { | |
5183 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5184 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5185 | __release_logical_link(chan); |
5186 | } else { | |
5187 | chan->move_id = chan->local_amp_id; | |
5188 | } | |
5189 | ||
5190 | l2cap_move_done(chan); | |
5191 | } | |
5192 | ||
8d5a04a1 MM |
5193 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5194 | ||
5f3847a4 MM |
5195 | l2cap_chan_unlock(chan); |
5196 | ||
8d5a04a1 MM |
5197 | return 0; |
5198 | } | |
5199 | ||
5200 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5201 | struct l2cap_cmd_hdr *cmd, |
5202 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5203 | { |
5204 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5205 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5206 | u16 icid; |
5207 | ||
5208 | if (cmd_len != sizeof(*rsp)) | |
5209 | return -EPROTO; | |
5210 | ||
5211 | icid = le16_to_cpu(rsp->icid); | |
5212 | ||
ad0ac6ca | 5213 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5214 | |
3fd71a0a MM |
5215 | chan = l2cap_get_chan_by_scid(conn, icid); |
5216 | if (!chan) | |
5217 | return 0; | |
5218 | ||
5219 | __clear_chan_timer(chan); | |
5220 | ||
5221 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5222 | chan->local_amp_id = chan->move_id; | |
5223 | ||
6ed971ca | 5224 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5225 | __release_logical_link(chan); |
5226 | ||
5227 | l2cap_move_done(chan); | |
5228 | } | |
5229 | ||
5230 | l2cap_chan_unlock(chan); | |
5231 | ||
8d5a04a1 MM |
5232 | return 0; |
5233 | } | |
5234 | ||
de73115a | 5235 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, |
2d792818 | 5236 | struct l2cap_cmd_hdr *cmd, |
203e639e | 5237 | u16 cmd_len, u8 *data) |
de73115a CT |
5238 | { |
5239 | struct hci_conn *hcon = conn->hcon; | |
5240 | struct l2cap_conn_param_update_req *req; | |
5241 | struct l2cap_conn_param_update_rsp rsp; | |
203e639e | 5242 | u16 min, max, latency, to_multiplier; |
2ce603eb | 5243 | int err; |
de73115a | 5244 | |
40bef302 | 5245 | if (hcon->role != HCI_ROLE_MASTER) |
de73115a CT |
5246 | return -EINVAL; |
5247 | ||
de73115a CT |
5248 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5249 | return -EPROTO; | |
5250 | ||
5251 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5252 | min = __le16_to_cpu(req->min); |
5253 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5254 | latency = __le16_to_cpu(req->latency); |
5255 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5256 | ||
5257 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5258 | min, max, latency, to_multiplier); |
de73115a CT |
5259 | |
5260 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb | 5261 | |
d4905f24 | 5262 | err = hci_check_conn_params(min, max, latency, to_multiplier); |
2ce603eb | 5263 | if (err) |
dcf4adbf | 5264 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5265 | else |
dcf4adbf | 5266 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5267 | |
5268 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5269 | sizeof(rsp), &rsp); |
de73115a | 5270 | |
ffb5a827 | 5271 | if (!err) { |
f4869e2a JH |
5272 | u8 store_hint; |
5273 | ||
5274 | store_hint = hci_le_conn_update(hcon, min, max, latency, | |
5275 | to_multiplier); | |
ffb5a827 | 5276 | mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type, |
f4869e2a JH |
5277 | store_hint, min, max, latency, |
5278 | to_multiplier); | |
ffb5a827 | 5279 | |
ffb5a827 | 5280 | } |
2ce603eb | 5281 | |
de73115a CT |
5282 | return 0; |
5283 | } | |
5284 | ||
f1496dee JH |
5285 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5286 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5287 | u8 *data) | |
5288 | { | |
5289 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; | |
5290 | u16 dcid, mtu, mps, credits, result; | |
5291 | struct l2cap_chan *chan; | |
5292 | int err; | |
5293 | ||
5294 | if (cmd_len < sizeof(*rsp)) | |
5295 | return -EPROTO; | |
5296 | ||
5297 | dcid = __le16_to_cpu(rsp->dcid); | |
5298 | mtu = __le16_to_cpu(rsp->mtu); | |
5299 | mps = __le16_to_cpu(rsp->mps); | |
5300 | credits = __le16_to_cpu(rsp->credits); | |
5301 | result = __le16_to_cpu(rsp->result); | |
5302 | ||
5303 | if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) | |
5304 | return -EPROTO; | |
5305 | ||
5306 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", | |
5307 | dcid, mtu, mps, credits, result); | |
5308 | ||
5309 | mutex_lock(&conn->chan_lock); | |
5310 | ||
5311 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5312 | if (!chan) { | |
5313 | err = -EBADSLT; | |
5314 | goto unlock; | |
5315 | } | |
5316 | ||
5317 | err = 0; | |
5318 | ||
5319 | l2cap_chan_lock(chan); | |
5320 | ||
5321 | switch (result) { | |
5322 | case L2CAP_CR_SUCCESS: | |
5323 | chan->ident = 0; | |
5324 | chan->dcid = dcid; | |
5325 | chan->omtu = mtu; | |
5326 | chan->remote_mps = mps; | |
0cd75f7e | 5327 | chan->tx_credits = credits; |
f1496dee JH |
5328 | l2cap_chan_ready(chan); |
5329 | break; | |
5330 | ||
5331 | default: | |
5332 | l2cap_chan_del(chan, ECONNREFUSED); | |
5333 | break; | |
5334 | } | |
5335 | ||
5336 | l2cap_chan_unlock(chan); | |
5337 | ||
5338 | unlock: | |
5339 | mutex_unlock(&conn->chan_lock); | |
5340 | ||
5341 | return err; | |
5342 | } | |
5343 | ||
3300d9a9 | 5344 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5345 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5346 | u8 *data) | |
3300d9a9 CT |
5347 | { |
5348 | int err = 0; | |
5349 | ||
5350 | switch (cmd->code) { | |
5351 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5352 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5353 | break; |
5354 | ||
5355 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5356 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5357 | break; |
5358 | ||
5359 | case L2CAP_CONN_RSP: | |
f5a2598d | 5360 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5361 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5362 | break; |
5363 | ||
5364 | case L2CAP_CONF_REQ: | |
5365 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5366 | break; | |
5367 | ||
5368 | case L2CAP_CONF_RSP: | |
9245e737 | 5369 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5370 | break; |
5371 | ||
5372 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5373 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5374 | break; |
5375 | ||
5376 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5377 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5378 | break; |
5379 | ||
5380 | case L2CAP_ECHO_REQ: | |
5381 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5382 | break; | |
5383 | ||
5384 | case L2CAP_ECHO_RSP: | |
5385 | break; | |
5386 | ||
5387 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5388 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5389 | break; |
5390 | ||
5391 | case L2CAP_INFO_RSP: | |
9245e737 | 5392 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5393 | break; |
5394 | ||
f94ff6ff MM |
5395 | case L2CAP_CREATE_CHAN_REQ: |
5396 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5397 | break; | |
5398 | ||
8d5a04a1 MM |
5399 | case L2CAP_MOVE_CHAN_REQ: |
5400 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5401 | break; | |
5402 | ||
5403 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5404 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5405 | break; |
5406 | ||
5407 | case L2CAP_MOVE_CHAN_CFM: | |
5408 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5409 | break; | |
5410 | ||
5411 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5412 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5413 | break; |
5414 | ||
3300d9a9 CT |
5415 | default: |
5416 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5417 | err = -EINVAL; | |
5418 | break; | |
5419 | } | |
5420 | ||
5421 | return err; | |
5422 | } | |
5423 | ||
27e2d4c8 JH |
5424 | static int l2cap_le_connect_req(struct l2cap_conn *conn, |
5425 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5426 | u8 *data) | |
5427 | { | |
5428 | struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; | |
5429 | struct l2cap_le_conn_rsp rsp; | |
5430 | struct l2cap_chan *chan, *pchan; | |
0cd75f7e | 5431 | u16 dcid, scid, credits, mtu, mps; |
27e2d4c8 JH |
5432 | __le16 psm; |
5433 | u8 result; | |
5434 | ||
5435 | if (cmd_len != sizeof(*req)) | |
5436 | return -EPROTO; | |
5437 | ||
5438 | scid = __le16_to_cpu(req->scid); | |
5439 | mtu = __le16_to_cpu(req->mtu); | |
5440 | mps = __le16_to_cpu(req->mps); | |
5441 | psm = req->psm; | |
5442 | dcid = 0; | |
0cd75f7e | 5443 | credits = 0; |
27e2d4c8 JH |
5444 | |
5445 | if (mtu < 23 || mps < 23) | |
5446 | return -EPROTO; | |
5447 | ||
5448 | BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), | |
5449 | scid, mtu, mps); | |
5450 | ||
5451 | /* Check if we have socket listening on psm */ | |
5452 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, | |
5453 | &conn->hcon->dst, LE_LINK); | |
5454 | if (!pchan) { | |
5455 | result = L2CAP_CR_BAD_PSM; | |
5456 | chan = NULL; | |
5457 | goto response; | |
5458 | } | |
5459 | ||
5460 | mutex_lock(&conn->chan_lock); | |
5461 | l2cap_chan_lock(pchan); | |
5462 | ||
5463 | if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) { | |
5464 | result = L2CAP_CR_AUTHENTICATION; | |
5465 | chan = NULL; | |
5466 | goto response_unlock; | |
5467 | } | |
5468 | ||
5469 | /* Check if we already have channel with that dcid */ | |
5470 | if (__l2cap_get_chan_by_dcid(conn, scid)) { | |
5471 | result = L2CAP_CR_NO_MEM; | |
5472 | chan = NULL; | |
5473 | goto response_unlock; | |
5474 | } | |
5475 | ||
5476 | chan = pchan->ops->new_connection(pchan); | |
5477 | if (!chan) { | |
5478 | result = L2CAP_CR_NO_MEM; | |
5479 | goto response_unlock; | |
5480 | } | |
5481 | ||
0ce43ce6 JH |
5482 | l2cap_le_flowctl_init(chan); |
5483 | ||
27e2d4c8 JH |
5484 | bacpy(&chan->src, &conn->hcon->src); |
5485 | bacpy(&chan->dst, &conn->hcon->dst); | |
5486 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); | |
5487 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
5488 | chan->psm = psm; | |
5489 | chan->dcid = scid; | |
5490 | chan->omtu = mtu; | |
5491 | chan->remote_mps = mps; | |
0cd75f7e | 5492 | chan->tx_credits = __le16_to_cpu(req->credits); |
27e2d4c8 JH |
5493 | |
5494 | __l2cap_chan_add(conn, chan); | |
5495 | dcid = chan->scid; | |
0cd75f7e | 5496 | credits = chan->rx_credits; |
27e2d4c8 JH |
5497 | |
5498 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
5499 | ||
5500 | chan->ident = cmd->ident; | |
5501 | ||
5502 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { | |
5503 | l2cap_state_change(chan, BT_CONNECT2); | |
5504 | result = L2CAP_CR_PEND; | |
5505 | chan->ops->defer(chan); | |
5506 | } else { | |
5507 | l2cap_chan_ready(chan); | |
5508 | result = L2CAP_CR_SUCCESS; | |
5509 | } | |
5510 | ||
5511 | response_unlock: | |
5512 | l2cap_chan_unlock(pchan); | |
5513 | mutex_unlock(&conn->chan_lock); | |
a24cce14 | 5514 | l2cap_chan_put(pchan); |
27e2d4c8 JH |
5515 | |
5516 | if (result == L2CAP_CR_PEND) | |
5517 | return 0; | |
5518 | ||
5519 | response: | |
5520 | if (chan) { | |
5521 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 5522 | rsp.mps = cpu_to_le16(chan->mps); |
27e2d4c8 JH |
5523 | } else { |
5524 | rsp.mtu = 0; | |
5525 | rsp.mps = 0; | |
5526 | } | |
5527 | ||
5528 | rsp.dcid = cpu_to_le16(dcid); | |
0cd75f7e | 5529 | rsp.credits = cpu_to_le16(credits); |
27e2d4c8 JH |
5530 | rsp.result = cpu_to_le16(result); |
5531 | ||
5532 | l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); | |
5533 | ||
5534 | return 0; | |
5535 | } | |
5536 | ||
fad5fc89 JH |
5537 | static inline int l2cap_le_credits(struct l2cap_conn *conn, |
5538 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5539 | u8 *data) | |
5540 | { | |
5541 | struct l2cap_le_credits *pkt; | |
5542 | struct l2cap_chan *chan; | |
0f1bfe4e | 5543 | u16 cid, credits, max_credits; |
fad5fc89 JH |
5544 | |
5545 | if (cmd_len != sizeof(*pkt)) | |
5546 | return -EPROTO; | |
5547 | ||
5548 | pkt = (struct l2cap_le_credits *) data; | |
5549 | cid = __le16_to_cpu(pkt->cid); | |
5550 | credits = __le16_to_cpu(pkt->credits); | |
5551 | ||
5552 | BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); | |
5553 | ||
5554 | chan = l2cap_get_chan_by_dcid(conn, cid); | |
5555 | if (!chan) | |
5556 | return -EBADSLT; | |
5557 | ||
0f1bfe4e JH |
5558 | max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; |
5559 | if (credits > max_credits) { | |
5560 | BT_ERR("LE credits overflow"); | |
5561 | l2cap_send_disconn_req(chan, ECONNRESET); | |
5562 | ||
5563 | /* Return 0 so that we don't trigger an unnecessary | |
5564 | * command reject packet. | |
5565 | */ | |
5566 | return 0; | |
5567 | } | |
5568 | ||
fad5fc89 JH |
5569 | chan->tx_credits += credits; |
5570 | ||
5571 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
5572 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
5573 | chan->tx_credits--; | |
5574 | } | |
5575 | ||
5576 | if (chan->tx_credits) | |
5577 | chan->ops->resume(chan); | |
5578 | ||
5579 | l2cap_chan_unlock(chan); | |
5580 | ||
5581 | return 0; | |
5582 | } | |
5583 | ||
71fb4197 JH |
5584 | static inline int l2cap_le_command_rej(struct l2cap_conn *conn, |
5585 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5586 | u8 *data) | |
5587 | { | |
5588 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; | |
5589 | struct l2cap_chan *chan; | |
5590 | ||
5591 | if (cmd_len < sizeof(*rej)) | |
5592 | return -EPROTO; | |
5593 | ||
5594 | mutex_lock(&conn->chan_lock); | |
5595 | ||
5596 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5597 | if (!chan) | |
5598 | goto done; | |
5599 | ||
5600 | l2cap_chan_lock(chan); | |
5601 | l2cap_chan_del(chan, ECONNREFUSED); | |
5602 | l2cap_chan_unlock(chan); | |
5603 | ||
5604 | done: | |
5605 | mutex_unlock(&conn->chan_lock); | |
5606 | return 0; | |
5607 | } | |
5608 | ||
3300d9a9 | 5609 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
203e639e JH |
5610 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5611 | u8 *data) | |
3300d9a9 | 5612 | { |
b5ecba64 JH |
5613 | int err = 0; |
5614 | ||
3300d9a9 CT |
5615 | switch (cmd->code) { |
5616 | case L2CAP_COMMAND_REJ: | |
71fb4197 | 5617 | l2cap_le_command_rej(conn, cmd, cmd_len, data); |
b5ecba64 | 5618 | break; |
3300d9a9 CT |
5619 | |
5620 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
b5ecba64 JH |
5621 | err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
5622 | break; | |
3300d9a9 CT |
5623 | |
5624 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
b5ecba64 | 5625 | break; |
3300d9a9 | 5626 | |
f1496dee JH |
5627 | case L2CAP_LE_CONN_RSP: |
5628 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5629 | break; |
f1496dee | 5630 | |
27e2d4c8 | 5631 | case L2CAP_LE_CONN_REQ: |
b5ecba64 JH |
5632 | err = l2cap_le_connect_req(conn, cmd, cmd_len, data); |
5633 | break; | |
27e2d4c8 | 5634 | |
fad5fc89 JH |
5635 | case L2CAP_LE_CREDITS: |
5636 | err = l2cap_le_credits(conn, cmd, cmd_len, data); | |
5637 | break; | |
5638 | ||
3defe01a | 5639 | case L2CAP_DISCONN_REQ: |
b5ecba64 JH |
5640 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
5641 | break; | |
3defe01a JH |
5642 | |
5643 | case L2CAP_DISCONN_RSP: | |
5644 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5645 | break; |
3defe01a | 5646 | |
3300d9a9 CT |
5647 | default: |
5648 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
b5ecba64 JH |
5649 | err = -EINVAL; |
5650 | break; | |
3300d9a9 | 5651 | } |
b5ecba64 JH |
5652 | |
5653 | return err; | |
3300d9a9 CT |
5654 | } |
5655 | ||
c5623556 JH |
5656 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5657 | struct sk_buff *skb) | |
5658 | { | |
69c4e4e8 | 5659 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5660 | struct l2cap_cmd_hdr *cmd; |
5661 | u16 len; | |
c5623556 JH |
5662 | int err; |
5663 | ||
69c4e4e8 | 5664 | if (hcon->type != LE_LINK) |
3b166295 | 5665 | goto drop; |
69c4e4e8 | 5666 | |
4f3e219d MH |
5667 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5668 | goto drop; | |
c5623556 | 5669 | |
4f3e219d MH |
5670 | cmd = (void *) skb->data; |
5671 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5672 | |
4f3e219d | 5673 | len = le16_to_cpu(cmd->len); |
c5623556 | 5674 | |
4f3e219d | 5675 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5676 | |
4f3e219d MH |
5677 | if (len != skb->len || !cmd->ident) { |
5678 | BT_DBG("corrupted command"); | |
5679 | goto drop; | |
5680 | } | |
c5623556 | 5681 | |
203e639e | 5682 | err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); |
4f3e219d MH |
5683 | if (err) { |
5684 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5685 | |
4f3e219d | 5686 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5687 | |
dcf4adbf | 5688 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5689 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5690 | sizeof(rej), &rej); | |
c5623556 JH |
5691 | } |
5692 | ||
3b166295 | 5693 | drop: |
c5623556 JH |
5694 | kfree_skb(skb); |
5695 | } | |
5696 | ||
3300d9a9 | 5697 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5698 | struct sk_buff *skb) |
1da177e4 | 5699 | { |
69c4e4e8 | 5700 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5701 | u8 *data = skb->data; |
5702 | int len = skb->len; | |
5703 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5704 | int err; |
1da177e4 LT |
5705 | |
5706 | l2cap_raw_recv(conn, skb); | |
5707 | ||
69c4e4e8 | 5708 | if (hcon->type != ACL_LINK) |
3b166295 | 5709 | goto drop; |
69c4e4e8 | 5710 | |
1da177e4 | 5711 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5712 | u16 cmd_len; |
1da177e4 LT |
5713 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5714 | data += L2CAP_CMD_HDR_SIZE; | |
5715 | len -= L2CAP_CMD_HDR_SIZE; | |
5716 | ||
88219a0f | 5717 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5718 | |
2d792818 GP |
5719 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5720 | cmd.ident); | |
1da177e4 | 5721 | |
88219a0f | 5722 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5723 | BT_DBG("corrupted command"); |
5724 | break; | |
5725 | } | |
5726 | ||
c5623556 | 5727 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5728 | if (err) { |
e2fd318e | 5729 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5730 | |
5731 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5732 | |
dcf4adbf | 5733 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5734 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5735 | sizeof(rej), &rej); | |
1da177e4 LT |
5736 | } |
5737 | ||
88219a0f AV |
5738 | data += cmd_len; |
5739 | len -= cmd_len; | |
1da177e4 LT |
5740 | } |
5741 | ||
3b166295 | 5742 | drop: |
1da177e4 LT |
5743 | kfree_skb(skb); |
5744 | } | |
5745 | ||
47d1ec61 | 5746 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5747 | { |
5748 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5749 | int hdr_size; |
5750 | ||
5751 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5752 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5753 | else | |
5754 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5755 | |
47d1ec61 | 5756 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5757 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5758 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5759 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5760 | ||
5761 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5762 | return -EBADMSG; |
fcc203c3 GP |
5763 | } |
5764 | return 0; | |
5765 | } | |
5766 | ||
6ea00485 | 5767 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5768 | { |
e31f7633 | 5769 | struct l2cap_ctrl control; |
d5392c8f | 5770 | |
e31f7633 | 5771 | BT_DBG("chan %p", chan); |
d5392c8f | 5772 | |
e31f7633 MM |
5773 | memset(&control, 0, sizeof(control)); |
5774 | control.sframe = 1; | |
5775 | control.final = 1; | |
5776 | control.reqseq = chan->buffer_seq; | |
5777 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5778 | |
e2ab4353 | 5779 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5780 | control.super = L2CAP_SUPER_RNR; |
5781 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5782 | } |
5783 | ||
e31f7633 MM |
5784 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5785 | chan->unacked_frames > 0) | |
5786 | __set_retrans_timer(chan); | |
d5392c8f | 5787 | |
e31f7633 | 5788 | /* Send pending iframes */ |
525cd185 | 5789 | l2cap_ertm_send(chan); |
d5392c8f | 5790 | |
e2ab4353 | 5791 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5792 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5793 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5794 | * send it now. | |
5795 | */ | |
5796 | control.super = L2CAP_SUPER_RR; | |
5797 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5798 | } |
5799 | } | |
5800 | ||
2d792818 GP |
5801 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5802 | struct sk_buff **last_frag) | |
18778a63 | 5803 | { |
84084a31 MM |
5804 | /* skb->len reflects data in skb as well as all fragments |
5805 | * skb->data_len reflects only data in fragments | |
5806 | */ | |
5807 | if (!skb_has_frag_list(skb)) | |
5808 | skb_shinfo(skb)->frag_list = new_frag; | |
5809 | ||
5810 | new_frag->next = NULL; | |
5811 | ||
5812 | (*last_frag)->next = new_frag; | |
5813 | *last_frag = new_frag; | |
5814 | ||
5815 | skb->len += new_frag->len; | |
5816 | skb->data_len += new_frag->len; | |
5817 | skb->truesize += new_frag->truesize; | |
5818 | } | |
5819 | ||
4b51dae9 MM |
5820 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5821 | struct l2cap_ctrl *control) | |
84084a31 MM |
5822 | { |
5823 | int err = -EINVAL; | |
18778a63 | 5824 | |
4b51dae9 | 5825 | switch (control->sar) { |
7e0ef6ee | 5826 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5827 | if (chan->sdu) |
5828 | break; | |
18778a63 | 5829 | |
80b98027 | 5830 | err = chan->ops->recv(chan, skb); |
84084a31 | 5831 | break; |
18778a63 | 5832 | |
7e0ef6ee | 5833 | case L2CAP_SAR_START: |
84084a31 MM |
5834 | if (chan->sdu) |
5835 | break; | |
18778a63 | 5836 | |
6f61fd47 | 5837 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5838 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5839 | |
84084a31 MM |
5840 | if (chan->sdu_len > chan->imtu) { |
5841 | err = -EMSGSIZE; | |
5842 | break; | |
5843 | } | |
1890d36b | 5844 | |
84084a31 MM |
5845 | if (skb->len >= chan->sdu_len) |
5846 | break; | |
18778a63 | 5847 | |
84084a31 MM |
5848 | chan->sdu = skb; |
5849 | chan->sdu_last_frag = skb; | |
18778a63 | 5850 | |
84084a31 MM |
5851 | skb = NULL; |
5852 | err = 0; | |
18778a63 GP |
5853 | break; |
5854 | ||
7e0ef6ee | 5855 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5856 | if (!chan->sdu) |
84084a31 | 5857 | break; |
18778a63 | 5858 | |
84084a31 MM |
5859 | append_skb_frag(chan->sdu, skb, |
5860 | &chan->sdu_last_frag); | |
5861 | skb = NULL; | |
18778a63 | 5862 | |
84084a31 MM |
5863 | if (chan->sdu->len >= chan->sdu_len) |
5864 | break; | |
4178ba46 | 5865 | |
84084a31 | 5866 | err = 0; |
18778a63 GP |
5867 | break; |
5868 | ||
7e0ef6ee | 5869 | case L2CAP_SAR_END: |
6f61fd47 | 5870 | if (!chan->sdu) |
84084a31 | 5871 | break; |
18778a63 | 5872 | |
84084a31 MM |
5873 | append_skb_frag(chan->sdu, skb, |
5874 | &chan->sdu_last_frag); | |
5875 | skb = NULL; | |
4178ba46 | 5876 | |
84084a31 MM |
5877 | if (chan->sdu->len != chan->sdu_len) |
5878 | break; | |
18778a63 | 5879 | |
80b98027 | 5880 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5881 | |
84084a31 MM |
5882 | if (!err) { |
5883 | /* Reassembly complete */ | |
5884 | chan->sdu = NULL; | |
5885 | chan->sdu_last_frag = NULL; | |
5886 | chan->sdu_len = 0; | |
1890d36b | 5887 | } |
18778a63 GP |
5888 | break; |
5889 | } | |
5890 | ||
84084a31 MM |
5891 | if (err) { |
5892 | kfree_skb(skb); | |
5893 | kfree_skb(chan->sdu); | |
5894 | chan->sdu = NULL; | |
5895 | chan->sdu_last_frag = NULL; | |
5896 | chan->sdu_len = 0; | |
5897 | } | |
18778a63 | 5898 | |
84084a31 | 5899 | return err; |
18778a63 GP |
5900 | } |
5901 | ||
32b32735 MM |
5902 | static int l2cap_resegment(struct l2cap_chan *chan) |
5903 | { | |
5904 | /* Placeholder */ | |
5905 | return 0; | |
5906 | } | |
5907 | ||
61aa4f5b | 5908 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5909 | { |
61aa4f5b | 5910 | u8 event; |
712132eb | 5911 | |
61aa4f5b MM |
5912 | if (chan->mode != L2CAP_MODE_ERTM) |
5913 | return; | |
712132eb | 5914 | |
61aa4f5b | 5915 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5916 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5917 | } |
5918 | ||
d2a7ac5d MM |
5919 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5920 | { | |
63838725 MM |
5921 | int err = 0; |
5922 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5923 | * until a gap is encountered. | |
5924 | */ | |
5925 | ||
5926 | BT_DBG("chan %p", chan); | |
5927 | ||
5928 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5929 | struct sk_buff *skb; | |
5930 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5931 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5932 | ||
5933 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5934 | ||
5935 | if (!skb) | |
5936 | break; | |
5937 | ||
5938 | skb_unlink(skb, &chan->srej_q); | |
5939 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5940 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5941 | if (err) | |
5942 | break; | |
5943 | } | |
5944 | ||
5945 | if (skb_queue_empty(&chan->srej_q)) { | |
5946 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5947 | l2cap_send_ack(chan); | |
5948 | } | |
5949 | ||
5950 | return err; | |
d2a7ac5d MM |
5951 | } |
5952 | ||
5953 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5954 | struct l2cap_ctrl *control) | |
5955 | { | |
f80842a8 MM |
5956 | struct sk_buff *skb; |
5957 | ||
5958 | BT_DBG("chan %p, control %p", chan, control); | |
5959 | ||
5960 | if (control->reqseq == chan->next_tx_seq) { | |
5961 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5962 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5963 | return; |
5964 | } | |
5965 | ||
5966 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5967 | ||
5968 | if (skb == NULL) { | |
5969 | BT_DBG("Seq %d not available for retransmission", | |
5970 | control->reqseq); | |
5971 | return; | |
5972 | } | |
5973 | ||
5974 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5975 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5976 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5977 | return; |
5978 | } | |
5979 | ||
5980 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5981 | ||
5982 | if (control->poll) { | |
5983 | l2cap_pass_to_tx(chan, control); | |
5984 | ||
5985 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5986 | l2cap_retransmit(chan, control); | |
5987 | l2cap_ertm_send(chan); | |
5988 | ||
5989 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5990 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5991 | chan->srej_save_reqseq = control->reqseq; | |
5992 | } | |
5993 | } else { | |
5994 | l2cap_pass_to_tx_fbit(chan, control); | |
5995 | ||
5996 | if (control->final) { | |
5997 | if (chan->srej_save_reqseq != control->reqseq || | |
5998 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5999 | &chan->conn_state)) | |
6000 | l2cap_retransmit(chan, control); | |
6001 | } else { | |
6002 | l2cap_retransmit(chan, control); | |
6003 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
6004 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
6005 | chan->srej_save_reqseq = control->reqseq; | |
6006 | } | |
6007 | } | |
6008 | } | |
d2a7ac5d MM |
6009 | } |
6010 | ||
6011 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
6012 | struct l2cap_ctrl *control) | |
6013 | { | |
fcd289df MM |
6014 | struct sk_buff *skb; |
6015 | ||
6016 | BT_DBG("chan %p, control %p", chan, control); | |
6017 | ||
6018 | if (control->reqseq == chan->next_tx_seq) { | |
6019 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 6020 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
6021 | return; |
6022 | } | |
6023 | ||
6024 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
6025 | ||
6026 | if (chan->max_tx && skb && | |
6027 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
6028 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 6029 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
6030 | return; |
6031 | } | |
6032 | ||
6033 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6034 | ||
6035 | l2cap_pass_to_tx(chan, control); | |
6036 | ||
6037 | if (control->final) { | |
6038 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
6039 | l2cap_retransmit_all(chan, control); | |
6040 | } else { | |
6041 | l2cap_retransmit_all(chan, control); | |
6042 | l2cap_ertm_send(chan); | |
6043 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
6044 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
6045 | } | |
d2a7ac5d MM |
6046 | } |
6047 | ||
4b51dae9 MM |
6048 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
6049 | { | |
6050 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
6051 | ||
6052 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
6053 | chan->expected_tx_seq); | |
6054 | ||
6055 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
6056 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 6057 | chan->tx_win) { |
4b51dae9 MM |
6058 | /* See notes below regarding "double poll" and |
6059 | * invalid packets. | |
6060 | */ | |
6061 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6062 | BT_DBG("Invalid/Ignore - after SREJ"); | |
6063 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6064 | } else { | |
6065 | BT_DBG("Invalid - in window after SREJ sent"); | |
6066 | return L2CAP_TXSEQ_INVALID; | |
6067 | } | |
6068 | } | |
6069 | ||
6070 | if (chan->srej_list.head == txseq) { | |
6071 | BT_DBG("Expected SREJ"); | |
6072 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
6073 | } | |
6074 | ||
6075 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
6076 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
6077 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
6078 | } | |
6079 | ||
6080 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
6081 | BT_DBG("Unexpected SREJ - not requested"); | |
6082 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
6083 | } | |
6084 | } | |
6085 | ||
6086 | if (chan->expected_tx_seq == txseq) { | |
6087 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
6088 | chan->tx_win) { | |
6089 | BT_DBG("Invalid - txseq outside tx window"); | |
6090 | return L2CAP_TXSEQ_INVALID; | |
6091 | } else { | |
6092 | BT_DBG("Expected"); | |
6093 | return L2CAP_TXSEQ_EXPECTED; | |
6094 | } | |
6095 | } | |
6096 | ||
6097 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 6098 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
6099 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
6100 | return L2CAP_TXSEQ_DUPLICATE; | |
6101 | } | |
6102 | ||
6103 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
6104 | /* A source of invalid packets is a "double poll" condition, | |
6105 | * where delays cause us to send multiple poll packets. If | |
6106 | * the remote stack receives and processes both polls, | |
6107 | * sequence numbers can wrap around in such a way that a | |
6108 | * resent frame has a sequence number that looks like new data | |
6109 | * with a sequence gap. This would trigger an erroneous SREJ | |
6110 | * request. | |
6111 | * | |
6112 | * Fortunately, this is impossible with a tx window that's | |
6113 | * less than half of the maximum sequence number, which allows | |
6114 | * invalid frames to be safely ignored. | |
6115 | * | |
6116 | * With tx window sizes greater than half of the tx window | |
6117 | * maximum, the frame is invalid and cannot be ignored. This | |
6118 | * causes a disconnect. | |
6119 | */ | |
6120 | ||
6121 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6122 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
6123 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6124 | } else { | |
6125 | BT_DBG("Invalid - txseq outside tx window"); | |
6126 | return L2CAP_TXSEQ_INVALID; | |
6127 | } | |
6128 | } else { | |
6129 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
6130 | return L2CAP_TXSEQ_UNEXPECTED; | |
6131 | } | |
6132 | } | |
6133 | ||
d2a7ac5d MM |
6134 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
6135 | struct l2cap_ctrl *control, | |
6136 | struct sk_buff *skb, u8 event) | |
6137 | { | |
6138 | int err = 0; | |
941247f9 | 6139 | bool skb_in_use = false; |
d2a7ac5d MM |
6140 | |
6141 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6142 | event); | |
6143 | ||
6144 | switch (event) { | |
6145 | case L2CAP_EV_RECV_IFRAME: | |
6146 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
6147 | case L2CAP_TXSEQ_EXPECTED: | |
6148 | l2cap_pass_to_tx(chan, control); | |
6149 | ||
6150 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6151 | BT_DBG("Busy, discarding expected seq %d", | |
6152 | control->txseq); | |
6153 | break; | |
6154 | } | |
6155 | ||
6156 | chan->expected_tx_seq = __next_seq(chan, | |
6157 | control->txseq); | |
6158 | ||
6159 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 6160 | skb_in_use = true; |
d2a7ac5d MM |
6161 | |
6162 | err = l2cap_reassemble_sdu(chan, skb, control); | |
6163 | if (err) | |
6164 | break; | |
6165 | ||
6166 | if (control->final) { | |
6167 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6168 | &chan->conn_state)) { | |
6169 | control->final = 0; | |
6170 | l2cap_retransmit_all(chan, control); | |
6171 | l2cap_ertm_send(chan); | |
6172 | } | |
6173 | } | |
6174 | ||
6175 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
6176 | l2cap_send_ack(chan); | |
6177 | break; | |
6178 | case L2CAP_TXSEQ_UNEXPECTED: | |
6179 | l2cap_pass_to_tx(chan, control); | |
6180 | ||
6181 | /* Can't issue SREJ frames in the local busy state. | |
6182 | * Drop this frame, it will be seen as missing | |
6183 | * when local busy is exited. | |
6184 | */ | |
6185 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6186 | BT_DBG("Busy, discarding unexpected seq %d", | |
6187 | control->txseq); | |
6188 | break; | |
6189 | } | |
6190 | ||
6191 | /* There was a gap in the sequence, so an SREJ | |
6192 | * must be sent for each missing frame. The | |
6193 | * current frame is stored for later use. | |
6194 | */ | |
6195 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6196 | skb_in_use = true; |
d2a7ac5d MM |
6197 | BT_DBG("Queued %p (queue len %d)", skb, |
6198 | skb_queue_len(&chan->srej_q)); | |
6199 | ||
6200 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
6201 | l2cap_seq_list_clear(&chan->srej_list); | |
6202 | l2cap_send_srej(chan, control->txseq); | |
6203 | ||
6204 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
6205 | break; | |
6206 | case L2CAP_TXSEQ_DUPLICATE: | |
6207 | l2cap_pass_to_tx(chan, control); | |
6208 | break; | |
6209 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6210 | break; | |
6211 | case L2CAP_TXSEQ_INVALID: | |
6212 | default: | |
5e4e3972 | 6213 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6214 | break; |
6215 | } | |
6216 | break; | |
6217 | case L2CAP_EV_RECV_RR: | |
6218 | l2cap_pass_to_tx(chan, control); | |
6219 | if (control->final) { | |
6220 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6221 | ||
e6a3ee6e MM |
6222 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
6223 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
6224 | control->final = 0; |
6225 | l2cap_retransmit_all(chan, control); | |
6226 | } | |
6227 | ||
6228 | l2cap_ertm_send(chan); | |
6229 | } else if (control->poll) { | |
6230 | l2cap_send_i_or_rr_or_rnr(chan); | |
6231 | } else { | |
6232 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6233 | &chan->conn_state) && | |
6234 | chan->unacked_frames) | |
6235 | __set_retrans_timer(chan); | |
6236 | ||
6237 | l2cap_ertm_send(chan); | |
6238 | } | |
6239 | break; | |
6240 | case L2CAP_EV_RECV_RNR: | |
6241 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6242 | l2cap_pass_to_tx(chan, control); | |
6243 | if (control && control->poll) { | |
6244 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6245 | l2cap_send_rr_or_rnr(chan, 0); | |
6246 | } | |
6247 | __clear_retrans_timer(chan); | |
6248 | l2cap_seq_list_clear(&chan->retrans_list); | |
6249 | break; | |
6250 | case L2CAP_EV_RECV_REJ: | |
6251 | l2cap_handle_rej(chan, control); | |
6252 | break; | |
6253 | case L2CAP_EV_RECV_SREJ: | |
6254 | l2cap_handle_srej(chan, control); | |
6255 | break; | |
6256 | default: | |
6257 | break; | |
6258 | } | |
6259 | ||
6260 | if (skb && !skb_in_use) { | |
6261 | BT_DBG("Freeing %p", skb); | |
6262 | kfree_skb(skb); | |
6263 | } | |
6264 | ||
6265 | return err; | |
6266 | } | |
6267 | ||
6268 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
6269 | struct l2cap_ctrl *control, | |
6270 | struct sk_buff *skb, u8 event) | |
6271 | { | |
6272 | int err = 0; | |
6273 | u16 txseq = control->txseq; | |
941247f9 | 6274 | bool skb_in_use = false; |
d2a7ac5d MM |
6275 | |
6276 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6277 | event); | |
6278 | ||
6279 | switch (event) { | |
6280 | case L2CAP_EV_RECV_IFRAME: | |
6281 | switch (l2cap_classify_txseq(chan, txseq)) { | |
6282 | case L2CAP_TXSEQ_EXPECTED: | |
6283 | /* Keep frame for reassembly later */ | |
6284 | l2cap_pass_to_tx(chan, control); | |
6285 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6286 | skb_in_use = true; |
d2a7ac5d MM |
6287 | BT_DBG("Queued %p (queue len %d)", skb, |
6288 | skb_queue_len(&chan->srej_q)); | |
6289 | ||
6290 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
6291 | break; | |
6292 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
6293 | l2cap_seq_list_pop(&chan->srej_list); | |
6294 | ||
6295 | l2cap_pass_to_tx(chan, control); | |
6296 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6297 | skb_in_use = true; |
d2a7ac5d MM |
6298 | BT_DBG("Queued %p (queue len %d)", skb, |
6299 | skb_queue_len(&chan->srej_q)); | |
6300 | ||
6301 | err = l2cap_rx_queued_iframes(chan); | |
6302 | if (err) | |
6303 | break; | |
6304 | ||
6305 | break; | |
6306 | case L2CAP_TXSEQ_UNEXPECTED: | |
6307 | /* Got a frame that can't be reassembled yet. | |
6308 | * Save it for later, and send SREJs to cover | |
6309 | * the missing frames. | |
6310 | */ | |
6311 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6312 | skb_in_use = true; |
d2a7ac5d MM |
6313 | BT_DBG("Queued %p (queue len %d)", skb, |
6314 | skb_queue_len(&chan->srej_q)); | |
6315 | ||
6316 | l2cap_pass_to_tx(chan, control); | |
6317 | l2cap_send_srej(chan, control->txseq); | |
6318 | break; | |
6319 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
6320 | /* This frame was requested with an SREJ, but | |
6321 | * some expected retransmitted frames are | |
6322 | * missing. Request retransmission of missing | |
6323 | * SREJ'd frames. | |
6324 | */ | |
6325 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6326 | skb_in_use = true; |
d2a7ac5d MM |
6327 | BT_DBG("Queued %p (queue len %d)", skb, |
6328 | skb_queue_len(&chan->srej_q)); | |
6329 | ||
6330 | l2cap_pass_to_tx(chan, control); | |
6331 | l2cap_send_srej_list(chan, control->txseq); | |
6332 | break; | |
6333 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
6334 | /* We've already queued this frame. Drop this copy. */ | |
6335 | l2cap_pass_to_tx(chan, control); | |
6336 | break; | |
6337 | case L2CAP_TXSEQ_DUPLICATE: | |
6338 | /* Expecting a later sequence number, so this frame | |
6339 | * was already received. Ignore it completely. | |
6340 | */ | |
6341 | break; | |
6342 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6343 | break; | |
6344 | case L2CAP_TXSEQ_INVALID: | |
6345 | default: | |
5e4e3972 | 6346 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6347 | break; |
6348 | } | |
6349 | break; | |
6350 | case L2CAP_EV_RECV_RR: | |
6351 | l2cap_pass_to_tx(chan, control); | |
6352 | if (control->final) { | |
6353 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6354 | ||
6355 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6356 | &chan->conn_state)) { | |
6357 | control->final = 0; | |
6358 | l2cap_retransmit_all(chan, control); | |
6359 | } | |
6360 | ||
6361 | l2cap_ertm_send(chan); | |
6362 | } else if (control->poll) { | |
6363 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6364 | &chan->conn_state) && | |
6365 | chan->unacked_frames) { | |
6366 | __set_retrans_timer(chan); | |
6367 | } | |
6368 | ||
6369 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6370 | l2cap_send_srej_tail(chan); | |
6371 | } else { | |
6372 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6373 | &chan->conn_state) && | |
6374 | chan->unacked_frames) | |
6375 | __set_retrans_timer(chan); | |
6376 | ||
6377 | l2cap_send_ack(chan); | |
6378 | } | |
6379 | break; | |
6380 | case L2CAP_EV_RECV_RNR: | |
6381 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6382 | l2cap_pass_to_tx(chan, control); | |
6383 | if (control->poll) { | |
6384 | l2cap_send_srej_tail(chan); | |
6385 | } else { | |
6386 | struct l2cap_ctrl rr_control; | |
6387 | memset(&rr_control, 0, sizeof(rr_control)); | |
6388 | rr_control.sframe = 1; | |
6389 | rr_control.super = L2CAP_SUPER_RR; | |
6390 | rr_control.reqseq = chan->buffer_seq; | |
6391 | l2cap_send_sframe(chan, &rr_control); | |
6392 | } | |
6393 | ||
6394 | break; | |
6395 | case L2CAP_EV_RECV_REJ: | |
6396 | l2cap_handle_rej(chan, control); | |
6397 | break; | |
6398 | case L2CAP_EV_RECV_SREJ: | |
6399 | l2cap_handle_srej(chan, control); | |
6400 | break; | |
6401 | } | |
6402 | ||
6403 | if (skb && !skb_in_use) { | |
6404 | BT_DBG("Freeing %p", skb); | |
6405 | kfree_skb(skb); | |
6406 | } | |
6407 | ||
6408 | return err; | |
6409 | } | |
6410 | ||
32b32735 MM |
6411 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6412 | { | |
6413 | BT_DBG("chan %p", chan); | |
6414 | ||
6415 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6416 | ||
6417 | if (chan->hs_hcon) | |
6418 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6419 | else | |
6420 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6421 | ||
6422 | return l2cap_resegment(chan); | |
6423 | } | |
6424 | ||
6425 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6426 | struct l2cap_ctrl *control, | |
6427 | struct sk_buff *skb, u8 event) | |
6428 | { | |
6429 | int err; | |
6430 | ||
6431 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6432 | event); | |
6433 | ||
6434 | if (!control->poll) | |
6435 | return -EPROTO; | |
6436 | ||
6437 | l2cap_process_reqseq(chan, control->reqseq); | |
6438 | ||
6439 | if (!skb_queue_empty(&chan->tx_q)) | |
6440 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6441 | else | |
6442 | chan->tx_send_head = NULL; | |
6443 | ||
6444 | /* Rewind next_tx_seq to the point expected | |
6445 | * by the receiver. | |
6446 | */ | |
6447 | chan->next_tx_seq = control->reqseq; | |
6448 | chan->unacked_frames = 0; | |
6449 | ||
6450 | err = l2cap_finish_move(chan); | |
6451 | if (err) | |
6452 | return err; | |
6453 | ||
6454 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6455 | l2cap_send_i_or_rr_or_rnr(chan); | |
6456 | ||
6457 | if (event == L2CAP_EV_RECV_IFRAME) | |
6458 | return -EPROTO; | |
6459 | ||
6460 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6461 | } | |
6462 | ||
6463 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6464 | struct l2cap_ctrl *control, | |
6465 | struct sk_buff *skb, u8 event) | |
6466 | { | |
6467 | int err; | |
6468 | ||
6469 | if (!control->final) | |
6470 | return -EPROTO; | |
6471 | ||
6472 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6473 | ||
6474 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6475 | l2cap_process_reqseq(chan, control->reqseq); | |
6476 | ||
6477 | if (!skb_queue_empty(&chan->tx_q)) | |
6478 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6479 | else | |
6480 | chan->tx_send_head = NULL; | |
6481 | ||
6482 | /* Rewind next_tx_seq to the point expected | |
6483 | * by the receiver. | |
6484 | */ | |
6485 | chan->next_tx_seq = control->reqseq; | |
6486 | chan->unacked_frames = 0; | |
6487 | ||
6488 | if (chan->hs_hcon) | |
6489 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6490 | else | |
6491 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6492 | ||
6493 | err = l2cap_resegment(chan); | |
6494 | ||
6495 | if (!err) | |
6496 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6497 | ||
6498 | return err; | |
6499 | } | |
6500 | ||
d2a7ac5d MM |
6501 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6502 | { | |
6503 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6504 | u16 unacked; | |
6505 | ||
6506 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6507 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6508 | } | |
6509 | ||
cec8ab6e MM |
6510 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6511 | struct sk_buff *skb, u8 event) | |
218bb9df | 6512 | { |
d2a7ac5d MM |
6513 | int err = 0; |
6514 | ||
6515 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6516 | control, skb, event, chan->rx_state); | |
6517 | ||
6518 | if (__valid_reqseq(chan, control->reqseq)) { | |
6519 | switch (chan->rx_state) { | |
6520 | case L2CAP_RX_STATE_RECV: | |
6521 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6522 | break; | |
6523 | case L2CAP_RX_STATE_SREJ_SENT: | |
6524 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6525 | event); | |
6526 | break; | |
32b32735 MM |
6527 | case L2CAP_RX_STATE_WAIT_P: |
6528 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6529 | break; | |
6530 | case L2CAP_RX_STATE_WAIT_F: | |
6531 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6532 | break; | |
d2a7ac5d MM |
6533 | default: |
6534 | /* shut it down */ | |
6535 | break; | |
6536 | } | |
6537 | } else { | |
6538 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6539 | control->reqseq, chan->next_tx_seq, | |
6540 | chan->expected_ack_seq); | |
5e4e3972 | 6541 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6542 | } |
6543 | ||
6544 | return err; | |
cec8ab6e MM |
6545 | } |
6546 | ||
6547 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6548 | struct sk_buff *skb) | |
6549 | { | |
4b51dae9 MM |
6550 | int err = 0; |
6551 | ||
6552 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6553 | chan->rx_state); | |
6554 | ||
6555 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6556 | L2CAP_TXSEQ_EXPECTED) { | |
6557 | l2cap_pass_to_tx(chan, control); | |
6558 | ||
6559 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6560 | __next_seq(chan, chan->buffer_seq)); | |
6561 | ||
6562 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6563 | ||
6564 | l2cap_reassemble_sdu(chan, skb, control); | |
6565 | } else { | |
6566 | if (chan->sdu) { | |
6567 | kfree_skb(chan->sdu); | |
6568 | chan->sdu = NULL; | |
6569 | } | |
6570 | chan->sdu_last_frag = NULL; | |
6571 | chan->sdu_len = 0; | |
6572 | ||
6573 | if (skb) { | |
6574 | BT_DBG("Freeing %p", skb); | |
6575 | kfree_skb(skb); | |
6576 | } | |
6577 | } | |
6578 | ||
6579 | chan->last_acked_seq = control->txseq; | |
6580 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6581 | ||
6582 | return err; | |
cec8ab6e MM |
6583 | } |
6584 | ||
6585 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6586 | { | |
6587 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
6588 | u16 len; | |
6589 | u8 event; | |
218bb9df | 6590 | |
b76bbd66 MM |
6591 | __unpack_control(chan, skb); |
6592 | ||
218bb9df GP |
6593 | len = skb->len; |
6594 | ||
6595 | /* | |
6596 | * We can just drop the corrupted I-frame here. | |
6597 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6598 | * procedures and ask for retransmission. |
218bb9df | 6599 | */ |
47d1ec61 | 6600 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6601 | goto drop; |
6602 | ||
cec8ab6e | 6603 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6604 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6605 | |
47d1ec61 | 6606 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6607 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6608 | |
47d1ec61 | 6609 | if (len > chan->mps) { |
5e4e3972 | 6610 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6611 | goto drop; |
6612 | } | |
6613 | ||
cec8ab6e MM |
6614 | if (!control->sframe) { |
6615 | int err; | |
218bb9df | 6616 | |
cec8ab6e MM |
6617 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6618 | control->sar, control->reqseq, control->final, | |
6619 | control->txseq); | |
218bb9df | 6620 | |
cec8ab6e MM |
6621 | /* Validate F-bit - F=0 always valid, F=1 only |
6622 | * valid in TX WAIT_F | |
6623 | */ | |
6624 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6625 | goto drop; |
cec8ab6e MM |
6626 | |
6627 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6628 | event = L2CAP_EV_RECV_IFRAME; | |
6629 | err = l2cap_rx(chan, control, skb, event); | |
6630 | } else { | |
6631 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6632 | } |
6633 | ||
cec8ab6e | 6634 | if (err) |
5e4e3972 | 6635 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6636 | } else { |
cec8ab6e MM |
6637 | const u8 rx_func_to_event[4] = { |
6638 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6639 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6640 | }; | |
6641 | ||
6642 | /* Only I-frames are expected in streaming mode */ | |
6643 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6644 | goto drop; | |
6645 | ||
6646 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6647 | control->reqseq, control->final, control->poll, | |
6648 | control->super); | |
6649 | ||
218bb9df | 6650 | if (len != 0) { |
1bb166e6 | 6651 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6652 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6653 | goto drop; |
6654 | } | |
6655 | ||
cec8ab6e MM |
6656 | /* Validate F and P bits */ |
6657 | if (control->final && (control->poll || | |
6658 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6659 | goto drop; | |
6660 | ||
6661 | event = rx_func_to_event[control->super]; | |
6662 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6663 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6664 | } |
6665 | ||
6666 | return 0; | |
6667 | ||
6668 | drop: | |
6669 | kfree_skb(skb); | |
6670 | return 0; | |
6671 | } | |
6672 | ||
b1c325c2 JH |
6673 | static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) |
6674 | { | |
6675 | struct l2cap_conn *conn = chan->conn; | |
6676 | struct l2cap_le_credits pkt; | |
6677 | u16 return_credits; | |
6678 | ||
6679 | /* We return more credits to the sender only after the amount of | |
6680 | * credits falls below half of the initial amount. | |
6681 | */ | |
f15b8ecf | 6682 | if (chan->rx_credits >= (le_max_credits + 1) / 2) |
b1c325c2 JH |
6683 | return; |
6684 | ||
f15b8ecf | 6685 | return_credits = le_max_credits - chan->rx_credits; |
b1c325c2 JH |
6686 | |
6687 | BT_DBG("chan %p returning %u credits to sender", chan, return_credits); | |
6688 | ||
6689 | chan->rx_credits += return_credits; | |
6690 | ||
6691 | pkt.cid = cpu_to_le16(chan->scid); | |
6692 | pkt.credits = cpu_to_le16(return_credits); | |
6693 | ||
6694 | chan->ident = l2cap_get_ident(conn); | |
6695 | ||
6696 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); | |
6697 | } | |
6698 | ||
fad5fc89 JH |
6699 | static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
6700 | { | |
aac23bf6 JH |
6701 | int err; |
6702 | ||
6703 | if (!chan->rx_credits) { | |
6704 | BT_ERR("No credits to receive LE L2CAP data"); | |
dfd9774c | 6705 | l2cap_send_disconn_req(chan, ECONNRESET); |
fad5fc89 | 6706 | return -ENOBUFS; |
aac23bf6 | 6707 | } |
fad5fc89 | 6708 | |
aac23bf6 JH |
6709 | if (chan->imtu < skb->len) { |
6710 | BT_ERR("Too big LE L2CAP PDU"); | |
fad5fc89 | 6711 | return -ENOBUFS; |
aac23bf6 | 6712 | } |
fad5fc89 JH |
6713 | |
6714 | chan->rx_credits--; | |
6715 | BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); | |
6716 | ||
6717 | l2cap_chan_le_send_credits(chan); | |
6718 | ||
aac23bf6 JH |
6719 | err = 0; |
6720 | ||
6721 | if (!chan->sdu) { | |
6722 | u16 sdu_len; | |
6723 | ||
6724 | sdu_len = get_unaligned_le16(skb->data); | |
6725 | skb_pull(skb, L2CAP_SDULEN_SIZE); | |
6726 | ||
6727 | BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", | |
6728 | sdu_len, skb->len, chan->imtu); | |
6729 | ||
6730 | if (sdu_len > chan->imtu) { | |
6731 | BT_ERR("Too big LE L2CAP SDU length received"); | |
6732 | err = -EMSGSIZE; | |
6733 | goto failed; | |
6734 | } | |
6735 | ||
6736 | if (skb->len > sdu_len) { | |
6737 | BT_ERR("Too much LE L2CAP data received"); | |
6738 | err = -EINVAL; | |
6739 | goto failed; | |
6740 | } | |
6741 | ||
6742 | if (skb->len == sdu_len) | |
6743 | return chan->ops->recv(chan, skb); | |
6744 | ||
6745 | chan->sdu = skb; | |
6746 | chan->sdu_len = sdu_len; | |
6747 | chan->sdu_last_frag = skb; | |
6748 | ||
6749 | return 0; | |
6750 | } | |
6751 | ||
6752 | BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", | |
6753 | chan->sdu->len, skb->len, chan->sdu_len); | |
6754 | ||
6755 | if (chan->sdu->len + skb->len > chan->sdu_len) { | |
6756 | BT_ERR("Too much LE L2CAP data received"); | |
6757 | err = -EINVAL; | |
6758 | goto failed; | |
6759 | } | |
6760 | ||
6761 | append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); | |
6762 | skb = NULL; | |
6763 | ||
6764 | if (chan->sdu->len == chan->sdu_len) { | |
6765 | err = chan->ops->recv(chan, chan->sdu); | |
6766 | if (!err) { | |
6767 | chan->sdu = NULL; | |
6768 | chan->sdu_last_frag = NULL; | |
6769 | chan->sdu_len = 0; | |
6770 | } | |
6771 | } | |
6772 | ||
6773 | failed: | |
6774 | if (err) { | |
6775 | kfree_skb(skb); | |
6776 | kfree_skb(chan->sdu); | |
6777 | chan->sdu = NULL; | |
6778 | chan->sdu_last_frag = NULL; | |
6779 | chan->sdu_len = 0; | |
6780 | } | |
6781 | ||
6782 | /* We can't return an error here since we took care of the skb | |
6783 | * freeing internally. An error return would cause the caller to | |
6784 | * do a double-free of the skb. | |
6785 | */ | |
6786 | return 0; | |
fad5fc89 JH |
6787 | } |
6788 | ||
13ca56e0 AE |
6789 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6790 | struct sk_buff *skb) | |
1da177e4 | 6791 | { |
48454079 | 6792 | struct l2cap_chan *chan; |
1da177e4 | 6793 | |
baa7e1fa | 6794 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6795 | if (!chan) { |
97e8e89d AE |
6796 | if (cid == L2CAP_CID_A2MP) { |
6797 | chan = a2mp_channel_create(conn, skb); | |
6798 | if (!chan) { | |
6799 | kfree_skb(skb); | |
13ca56e0 | 6800 | return; |
97e8e89d AE |
6801 | } |
6802 | ||
6803 | l2cap_chan_lock(chan); | |
6804 | } else { | |
6805 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6806 | /* Drop packet and return */ | |
6807 | kfree_skb(skb); | |
13ca56e0 | 6808 | return; |
97e8e89d | 6809 | } |
1da177e4 LT |
6810 | } |
6811 | ||
49208c9c | 6812 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6813 | |
89bc500e | 6814 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6815 | goto drop; |
6816 | ||
0c1bc5c6 | 6817 | switch (chan->mode) { |
38319713 | 6818 | case L2CAP_MODE_LE_FLOWCTL: |
fad5fc89 JH |
6819 | if (l2cap_le_data_rcv(chan, skb) < 0) |
6820 | goto drop; | |
6821 | ||
6822 | goto done; | |
6823 | ||
1c2acffb GP |
6824 | case L2CAP_MODE_BASIC: |
6825 | /* If socket recv buffers overflows we drop data here | |
6826 | * which is *bad* because L2CAP has to be reliable. | |
6827 | * But we don't have any other choice. L2CAP doesn't | |
6828 | * provide flow control mechanism. */ | |
1da177e4 | 6829 | |
2c96e03d SJ |
6830 | if (chan->imtu < skb->len) { |
6831 | BT_ERR("Dropping L2CAP data: receive buffer overflow"); | |
1c2acffb | 6832 | goto drop; |
2c96e03d | 6833 | } |
1da177e4 | 6834 | |
80b98027 | 6835 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6836 | goto done; |
6837 | break; | |
6838 | ||
6839 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6840 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6841 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6842 | goto done; |
6843 | ||
1c2acffb | 6844 | default: |
0c1bc5c6 | 6845 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6846 | break; |
6847 | } | |
1da177e4 LT |
6848 | |
6849 | drop: | |
6850 | kfree_skb(skb); | |
6851 | ||
6852 | done: | |
6be36555 | 6853 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6854 | } |
6855 | ||
84104b24 AE |
6856 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6857 | struct sk_buff *skb) | |
1da177e4 | 6858 | { |
ae4fd2d3 | 6859 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6860 | struct l2cap_chan *chan; |
1da177e4 | 6861 | |
ae4fd2d3 | 6862 | if (hcon->type != ACL_LINK) |
a24cce14 | 6863 | goto free_skb; |
ae4fd2d3 | 6864 | |
bf20fd4e JH |
6865 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, |
6866 | ACL_LINK); | |
23691d75 | 6867 | if (!chan) |
a24cce14 | 6868 | goto free_skb; |
1da177e4 | 6869 | |
5b4cedaa | 6870 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6871 | |
89bc500e | 6872 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6873 | goto drop; |
6874 | ||
e13e21dc | 6875 | if (chan->imtu < skb->len) |
1da177e4 LT |
6876 | goto drop; |
6877 | ||
2edf870d | 6878 | /* Store remote BD_ADDR and PSM for msg_name */ |
06ae3314 | 6879 | bacpy(&bt_cb(skb)->bdaddr, &hcon->dst); |
2edf870d MH |
6880 | bt_cb(skb)->psm = psm; |
6881 | ||
a24cce14 JH |
6882 | if (!chan->ops->recv(chan, skb)) { |
6883 | l2cap_chan_put(chan); | |
84104b24 | 6884 | return; |
a24cce14 | 6885 | } |
1da177e4 LT |
6886 | |
6887 | drop: | |
a24cce14 JH |
6888 | l2cap_chan_put(chan); |
6889 | free_skb: | |
1da177e4 | 6890 | kfree_skb(skb); |
1da177e4 LT |
6891 | } |
6892 | ||
72f78356 | 6893 | static void l2cap_att_channel(struct l2cap_conn *conn, |
6810fca7 | 6894 | struct sk_buff *skb) |
9f69bda6 | 6895 | { |
b99707d7 | 6896 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6897 | struct l2cap_chan *chan; |
9f69bda6 | 6898 | |
b99707d7 | 6899 | if (hcon->type != LE_LINK) |
a24cce14 | 6900 | goto free_skb; |
b99707d7 | 6901 | |
af1c0134 | 6902 | chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT, |
06ae3314 | 6903 | &hcon->src, &hcon->dst); |
23691d75 | 6904 | if (!chan) |
a24cce14 | 6905 | goto free_skb; |
9f69bda6 | 6906 | |
5b4cedaa | 6907 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 6908 | |
e13e21dc | 6909 | if (chan->imtu < skb->len) |
9f69bda6 GP |
6910 | goto drop; |
6911 | ||
a24cce14 JH |
6912 | if (!chan->ops->recv(chan, skb)) { |
6913 | l2cap_chan_put(chan); | |
6810fca7 | 6914 | return; |
a24cce14 | 6915 | } |
9f69bda6 GP |
6916 | |
6917 | drop: | |
a24cce14 JH |
6918 | l2cap_chan_put(chan); |
6919 | free_skb: | |
9f69bda6 | 6920 | kfree_skb(skb); |
9f69bda6 GP |
6921 | } |
6922 | ||
1da177e4 LT |
6923 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
6924 | { | |
6925 | struct l2cap_hdr *lh = (void *) skb->data; | |
61a939c6 | 6926 | struct hci_conn *hcon = conn->hcon; |
8e036fc3 AV |
6927 | u16 cid, len; |
6928 | __le16 psm; | |
1da177e4 | 6929 | |
61a939c6 JH |
6930 | if (hcon->state != BT_CONNECTED) { |
6931 | BT_DBG("queueing pending rx skb"); | |
6932 | skb_queue_tail(&conn->pending_rx, skb); | |
6933 | return; | |
6934 | } | |
6935 | ||
1da177e4 LT |
6936 | skb_pull(skb, L2CAP_HDR_SIZE); |
6937 | cid = __le16_to_cpu(lh->cid); | |
6938 | len = __le16_to_cpu(lh->len); | |
6939 | ||
1c2acffb GP |
6940 | if (len != skb->len) { |
6941 | kfree_skb(skb); | |
6942 | return; | |
6943 | } | |
6944 | ||
9e1d7e15 JH |
6945 | /* Since we can't actively block incoming LE connections we must |
6946 | * at least ensure that we ignore incoming data from them. | |
6947 | */ | |
6948 | if (hcon->type == LE_LINK && | |
dcc36c16 JH |
6949 | hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst, |
6950 | bdaddr_type(hcon, hcon->dst_type))) { | |
e493150e JH |
6951 | kfree_skb(skb); |
6952 | return; | |
6953 | } | |
6954 | ||
1da177e4 LT |
6955 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6956 | ||
6957 | switch (cid) { | |
8db4dc46 | 6958 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6959 | l2cap_sig_channel(conn, skb); |
6960 | break; | |
6961 | ||
8db4dc46 | 6962 | case L2CAP_CID_CONN_LESS: |
097db76c | 6963 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6964 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6965 | l2cap_conless_channel(conn, psm, skb); |
6966 | break; | |
6967 | ||
073d1cf3 | 6968 | case L2CAP_CID_ATT: |
72f78356 | 6969 | l2cap_att_channel(conn, skb); |
9f69bda6 GP |
6970 | break; |
6971 | ||
a2877629 MH |
6972 | case L2CAP_CID_LE_SIGNALING: |
6973 | l2cap_le_sig_channel(conn, skb); | |
6974 | break; | |
6975 | ||
b501d6a1 AB |
6976 | case L2CAP_CID_SMP: |
6977 | if (smp_sig_channel(conn, skb)) | |
6978 | l2cap_conn_del(conn->hcon, EACCES); | |
6979 | break; | |
6980 | ||
1da177e4 LT |
6981 | default: |
6982 | l2cap_data_channel(conn, cid, skb); | |
6983 | break; | |
6984 | } | |
6985 | } | |
6986 | ||
61a939c6 JH |
6987 | static void process_pending_rx(struct work_struct *work) |
6988 | { | |
6989 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, | |
6990 | pending_rx_work); | |
6991 | struct sk_buff *skb; | |
6992 | ||
6993 | BT_DBG(""); | |
6994 | ||
6995 | while ((skb = skb_dequeue(&conn->pending_rx))) | |
6996 | l2cap_recv_frame(conn, skb); | |
6997 | } | |
6998 | ||
162b49e7 JH |
6999 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
7000 | { | |
7001 | struct l2cap_conn *conn = hcon->l2cap_data; | |
7002 | struct hci_chan *hchan; | |
7003 | ||
7004 | if (conn) | |
7005 | return conn; | |
7006 | ||
7007 | hchan = hci_chan_create(hcon); | |
7008 | if (!hchan) | |
7009 | return NULL; | |
7010 | ||
27f70f3e | 7011 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); |
162b49e7 JH |
7012 | if (!conn) { |
7013 | hci_chan_del(hchan); | |
7014 | return NULL; | |
7015 | } | |
7016 | ||
7017 | kref_init(&conn->ref); | |
7018 | hcon->l2cap_data = conn; | |
7019 | conn->hcon = hcon; | |
7020 | hci_conn_get(conn->hcon); | |
7021 | conn->hchan = hchan; | |
7022 | ||
7023 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); | |
7024 | ||
7025 | switch (hcon->type) { | |
7026 | case LE_LINK: | |
7027 | if (hcon->hdev->le_mtu) { | |
7028 | conn->mtu = hcon->hdev->le_mtu; | |
7029 | break; | |
7030 | } | |
7031 | /* fall through */ | |
7032 | default: | |
7033 | conn->mtu = hcon->hdev->acl_mtu; | |
7034 | break; | |
7035 | } | |
7036 | ||
7037 | conn->feat_mask = 0; | |
7038 | ||
7039 | if (hcon->type == ACL_LINK) | |
7040 | conn->hs_enabled = test_bit(HCI_HS_ENABLED, | |
7041 | &hcon->hdev->dev_flags); | |
7042 | ||
5a54e7c8 | 7043 | mutex_init(&conn->ident_lock); |
162b49e7 JH |
7044 | mutex_init(&conn->chan_lock); |
7045 | ||
7046 | INIT_LIST_HEAD(&conn->chan_l); | |
7047 | INIT_LIST_HEAD(&conn->users); | |
7048 | ||
7049 | if (hcon->type == LE_LINK) | |
7050 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); | |
7051 | else | |
7052 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); | |
7053 | ||
61a939c6 JH |
7054 | skb_queue_head_init(&conn->pending_rx); |
7055 | INIT_WORK(&conn->pending_rx_work, process_pending_rx); | |
7056 | ||
162b49e7 JH |
7057 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
7058 | ||
7059 | return conn; | |
7060 | } | |
7061 | ||
7062 | static bool is_valid_psm(u16 psm, u8 dst_type) { | |
7063 | if (!psm) | |
7064 | return false; | |
7065 | ||
7066 | if (bdaddr_type_is_le(dst_type)) | |
7067 | return (psm <= 0x00ff); | |
7068 | ||
7069 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
7070 | return ((psm & 0x0101) == 0x0001); | |
7071 | } | |
7072 | ||
7073 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, | |
7074 | bdaddr_t *dst, u8 dst_type) | |
7075 | { | |
7076 | struct l2cap_conn *conn; | |
7077 | struct hci_conn *hcon; | |
7078 | struct hci_dev *hdev; | |
162b49e7 JH |
7079 | int err; |
7080 | ||
7081 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, | |
7082 | dst_type, __le16_to_cpu(psm)); | |
7083 | ||
7084 | hdev = hci_get_route(dst, &chan->src); | |
7085 | if (!hdev) | |
7086 | return -EHOSTUNREACH; | |
7087 | ||
7088 | hci_dev_lock(hdev); | |
7089 | ||
7090 | l2cap_chan_lock(chan); | |
7091 | ||
7092 | if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && | |
7093 | chan->chan_type != L2CAP_CHAN_RAW) { | |
7094 | err = -EINVAL; | |
7095 | goto done; | |
7096 | } | |
7097 | ||
21626e62 JH |
7098 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { |
7099 | err = -EINVAL; | |
7100 | goto done; | |
7101 | } | |
7102 | ||
7103 | if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { | |
162b49e7 JH |
7104 | err = -EINVAL; |
7105 | goto done; | |
7106 | } | |
7107 | ||
7108 | switch (chan->mode) { | |
7109 | case L2CAP_MODE_BASIC: | |
7110 | break; | |
7111 | case L2CAP_MODE_LE_FLOWCTL: | |
7112 | l2cap_le_flowctl_init(chan); | |
7113 | break; | |
7114 | case L2CAP_MODE_ERTM: | |
7115 | case L2CAP_MODE_STREAMING: | |
7116 | if (!disable_ertm) | |
7117 | break; | |
7118 | /* fall through */ | |
7119 | default: | |
beb19e4c | 7120 | err = -EOPNOTSUPP; |
162b49e7 JH |
7121 | goto done; |
7122 | } | |
7123 | ||
7124 | switch (chan->state) { | |
7125 | case BT_CONNECT: | |
7126 | case BT_CONNECT2: | |
7127 | case BT_CONFIG: | |
7128 | /* Already connecting */ | |
7129 | err = 0; | |
7130 | goto done; | |
7131 | ||
7132 | case BT_CONNECTED: | |
7133 | /* Already connected */ | |
7134 | err = -EISCONN; | |
7135 | goto done; | |
7136 | ||
7137 | case BT_OPEN: | |
7138 | case BT_BOUND: | |
7139 | /* Can connect */ | |
7140 | break; | |
7141 | ||
7142 | default: | |
7143 | err = -EBADFD; | |
7144 | goto done; | |
7145 | } | |
7146 | ||
7147 | /* Set destination address and psm */ | |
7148 | bacpy(&chan->dst, dst); | |
7149 | chan->dst_type = dst_type; | |
7150 | ||
7151 | chan->psm = psm; | |
7152 | chan->dcid = cid; | |
7153 | ||
6f77d8c7 | 7154 | if (bdaddr_type_is_le(dst_type)) { |
e804d25d | 7155 | u8 role; |
cdd6275e | 7156 | |
6f77d8c7 AG |
7157 | /* Convert from L2CAP channel address type to HCI address type |
7158 | */ | |
7159 | if (dst_type == BDADDR_LE_PUBLIC) | |
7160 | dst_type = ADDR_LE_DEV_PUBLIC; | |
7161 | else | |
7162 | dst_type = ADDR_LE_DEV_RANDOM; | |
7163 | ||
e804d25d JH |
7164 | if (test_bit(HCI_ADVERTISING, &hdev->dev_flags)) |
7165 | role = HCI_ROLE_SLAVE; | |
7166 | else | |
7167 | role = HCI_ROLE_MASTER; | |
cdd6275e | 7168 | |
04a6c589 | 7169 | hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level, |
e804d25d | 7170 | HCI_LE_CONN_TIMEOUT, role); |
6f77d8c7 | 7171 | } else { |
d93375a8 | 7172 | u8 auth_type = l2cap_get_auth_type(chan); |
04a6c589 | 7173 | hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type); |
6f77d8c7 | 7174 | } |
162b49e7 JH |
7175 | |
7176 | if (IS_ERR(hcon)) { | |
7177 | err = PTR_ERR(hcon); | |
7178 | goto done; | |
7179 | } | |
7180 | ||
7181 | conn = l2cap_conn_add(hcon); | |
7182 | if (!conn) { | |
7183 | hci_conn_drop(hcon); | |
7184 | err = -ENOMEM; | |
7185 | goto done; | |
7186 | } | |
7187 | ||
7188 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { | |
7189 | hci_conn_drop(hcon); | |
7190 | err = -EBUSY; | |
7191 | goto done; | |
7192 | } | |
7193 | ||
7194 | /* Update source addr of the socket */ | |
7195 | bacpy(&chan->src, &hcon->src); | |
7196 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
7197 | ||
7198 | l2cap_chan_unlock(chan); | |
7199 | l2cap_chan_add(conn, chan); | |
7200 | l2cap_chan_lock(chan); | |
7201 | ||
7202 | /* l2cap_chan_add takes its own ref so we can drop this one */ | |
7203 | hci_conn_drop(hcon); | |
7204 | ||
7205 | l2cap_state_change(chan, BT_CONNECT); | |
7206 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
7207 | ||
61202e4d JH |
7208 | /* Release chan->sport so that it can be reused by other |
7209 | * sockets (as it's only used for listening sockets). | |
7210 | */ | |
7211 | write_lock(&chan_list_lock); | |
7212 | chan->sport = 0; | |
7213 | write_unlock(&chan_list_lock); | |
7214 | ||
162b49e7 JH |
7215 | if (hcon->state == BT_CONNECTED) { |
7216 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { | |
7217 | __clear_chan_timer(chan); | |
e7cafc45 | 7218 | if (l2cap_chan_check_security(chan, true)) |
162b49e7 JH |
7219 | l2cap_state_change(chan, BT_CONNECTED); |
7220 | } else | |
7221 | l2cap_do_start(chan); | |
7222 | } | |
7223 | ||
7224 | err = 0; | |
7225 | ||
7226 | done: | |
7227 | l2cap_chan_unlock(chan); | |
7228 | hci_dev_unlock(hdev); | |
7229 | hci_dev_put(hdev); | |
7230 | return err; | |
7231 | } | |
6b8d4a6a | 7232 | EXPORT_SYMBOL_GPL(l2cap_chan_connect); |
162b49e7 | 7233 | |
1da177e4 LT |
7234 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
7235 | ||
686ebf28 | 7236 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
7237 | { |
7238 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 7239 | struct l2cap_chan *c; |
1da177e4 | 7240 | |
6ed93dc6 | 7241 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
7242 | |
7243 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
7244 | read_lock(&chan_list_lock); |
7245 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 7246 | if (c->state != BT_LISTEN) |
1da177e4 LT |
7247 | continue; |
7248 | ||
7eafc59e | 7249 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 7250 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 7251 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 7252 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 7253 | exact++; |
7eafc59e | 7254 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 7255 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 7256 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
7257 | lm2 |= HCI_LM_MASTER; |
7258 | } | |
1da177e4 | 7259 | } |
23691d75 | 7260 | read_unlock(&chan_list_lock); |
1da177e4 LT |
7261 | |
7262 | return exact ? lm1 : lm2; | |
7263 | } | |
7264 | ||
9e664631 | 7265 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 7266 | { |
0139418c MH |
7267 | struct l2cap_conn *conn; |
7268 | ||
6ed93dc6 | 7269 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 7270 | |
dc0f5088 | 7271 | if (status) { |
e175072f | 7272 | l2cap_conn_del(hcon, bt_to_errno(status)); |
dc0f5088 | 7273 | return; |
ba6fc317 | 7274 | } |
dc0f5088 JH |
7275 | |
7276 | conn = l2cap_conn_add(hcon); | |
7277 | if (!conn) | |
7278 | return; | |
7279 | ||
7280 | l2cap_conn_ready(conn); | |
1da177e4 LT |
7281 | } |
7282 | ||
686ebf28 | 7283 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
7284 | { |
7285 | struct l2cap_conn *conn = hcon->l2cap_data; | |
7286 | ||
7287 | BT_DBG("hcon %p", hcon); | |
7288 | ||
686ebf28 | 7289 | if (!conn) |
9f5a0d7b | 7290 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
7291 | return conn->disc_reason; |
7292 | } | |
7293 | ||
9e664631 | 7294 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
7295 | { |
7296 | BT_DBG("hcon %p reason %d", hcon, reason); | |
7297 | ||
e175072f | 7298 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
7299 | } |
7300 | ||
4343478f | 7301 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 7302 | { |
715ec005 | 7303 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
7304 | return; |
7305 | ||
f62e4323 | 7306 | if (encrypt == 0x00) { |
4343478f | 7307 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 7308 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
7d513e92 MH |
7309 | } else if (chan->sec_level == BT_SECURITY_HIGH || |
7310 | chan->sec_level == BT_SECURITY_FIPS) | |
0f852724 | 7311 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 7312 | } else { |
4343478f | 7313 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 7314 | __clear_chan_timer(chan); |
f62e4323 MH |
7315 | } |
7316 | } | |
7317 | ||
686ebf28 | 7318 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 7319 | { |
0139418c | 7320 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 7321 | struct l2cap_chan *chan; |
1da177e4 | 7322 | |
0139418c | 7323 | if (!conn) |
1da177e4 | 7324 | return 0; |
0139418c | 7325 | |
89d8b407 | 7326 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 7327 | |
160dc6ac | 7328 | if (hcon->type == LE_LINK) { |
35d4adcc | 7329 | if (!status && encrypt) |
4bd6d38e | 7330 | smp_distribute_keys(conn); |
17cd3f37 | 7331 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
7332 | } |
7333 | ||
3df91ea2 | 7334 | mutex_lock(&conn->chan_lock); |
1da177e4 | 7335 | |
3df91ea2 | 7336 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 7337 | l2cap_chan_lock(chan); |
1da177e4 | 7338 | |
89d8b407 AE |
7339 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
7340 | state_to_string(chan->state)); | |
f1cb9af5 | 7341 | |
2338a7e0 | 7342 | if (chan->scid == L2CAP_CID_A2MP) { |
78eb2f98 AE |
7343 | l2cap_chan_unlock(chan); |
7344 | continue; | |
7345 | } | |
7346 | ||
191eb398 JH |
7347 | if (!status && encrypt) |
7348 | chan->sec_level = hcon->sec_level; | |
f1cb9af5 | 7349 | |
96eff46e | 7350 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 7351 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
7352 | continue; |
7353 | } | |
7354 | ||
89bc500e | 7355 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 7356 | chan->state == BT_CONFIG)) { |
d97c899b | 7357 | chan->ops->resume(chan); |
4343478f | 7358 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 7359 | l2cap_chan_unlock(chan); |
9719f8af MH |
7360 | continue; |
7361 | } | |
7362 | ||
89bc500e | 7363 | if (chan->state == BT_CONNECT) { |
6d3c15da | 7364 | if (!status) |
93c3e8f5 | 7365 | l2cap_start_connection(chan); |
6d3c15da | 7366 | else |
ba13ccd9 | 7367 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
89bc500e | 7368 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 7369 | struct l2cap_conn_rsp rsp; |
df3c3931 | 7370 | __u16 res, stat; |
1da177e4 | 7371 | |
b1235d79 | 7372 | if (!status) { |
bdc25783 | 7373 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
7374 | res = L2CAP_CR_PEND; |
7375 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 7376 | chan->ops->defer(chan); |
df3c3931 | 7377 | } else { |
acdcabf5 | 7378 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
7379 | res = L2CAP_CR_SUCCESS; |
7380 | stat = L2CAP_CS_NO_INFO; | |
7381 | } | |
b1235d79 | 7382 | } else { |
acdcabf5 | 7383 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 7384 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
7385 | res = L2CAP_CR_SEC_BLOCK; |
7386 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
7387 | } |
7388 | ||
fe4128e0 GP |
7389 | rsp.scid = cpu_to_le16(chan->dcid); |
7390 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
7391 | rsp.result = cpu_to_le16(res); |
7392 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 7393 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 7394 | sizeof(rsp), &rsp); |
2d369359 MM |
7395 | |
7396 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
7397 | res == L2CAP_CR_SUCCESS) { | |
7398 | char buf[128]; | |
7399 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
7400 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
7401 | L2CAP_CONF_REQ, | |
7402 | l2cap_build_conf_req(chan, buf), | |
7403 | buf); | |
7404 | chan->num_conf_req++; | |
7405 | } | |
b1235d79 | 7406 | } |
1da177e4 | 7407 | |
6be36555 | 7408 | l2cap_chan_unlock(chan); |
1da177e4 LT |
7409 | } |
7410 | ||
3df91ea2 | 7411 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 7412 | |
1da177e4 LT |
7413 | return 0; |
7414 | } | |
7415 | ||
686ebf28 | 7416 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
7417 | { |
7418 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
7419 | struct l2cap_hdr *hdr; |
7420 | int len; | |
1da177e4 | 7421 | |
1d13a254 AE |
7422 | /* For AMP controller do not create l2cap conn */ |
7423 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
7424 | goto drop; | |
1da177e4 | 7425 | |
5a08ecce | 7426 | if (!conn) |
baf43251 | 7427 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
7428 | |
7429 | if (!conn) | |
1da177e4 LT |
7430 | goto drop; |
7431 | ||
7432 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
7433 | ||
d73a0988 AE |
7434 | switch (flags) { |
7435 | case ACL_START: | |
7436 | case ACL_START_NO_FLUSH: | |
7437 | case ACL_COMPLETE: | |
1da177e4 LT |
7438 | if (conn->rx_len) { |
7439 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
7440 | kfree_skb(conn->rx_skb); | |
7441 | conn->rx_skb = NULL; | |
7442 | conn->rx_len = 0; | |
7443 | l2cap_conn_unreliable(conn, ECOMM); | |
7444 | } | |
7445 | ||
aae7fe22 AE |
7446 | /* Start fragment always begin with Basic L2CAP header */ |
7447 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
7448 | BT_ERR("Frame is too short (len %d)", skb->len); |
7449 | l2cap_conn_unreliable(conn, ECOMM); | |
7450 | goto drop; | |
7451 | } | |
7452 | ||
7453 | hdr = (struct l2cap_hdr *) skb->data; | |
7454 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
7455 | ||
7456 | if (len == skb->len) { | |
7457 | /* Complete frame received */ | |
7458 | l2cap_recv_frame(conn, skb); | |
7459 | return 0; | |
7460 | } | |
7461 | ||
7462 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
7463 | ||
7464 | if (skb->len > len) { | |
7465 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 7466 | skb->len, len); |
1da177e4 LT |
7467 | l2cap_conn_unreliable(conn, ECOMM); |
7468 | goto drop; | |
7469 | } | |
7470 | ||
7471 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 7472 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 7473 | if (!conn->rx_skb) |
1da177e4 LT |
7474 | goto drop; |
7475 | ||
d626f62b | 7476 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7477 | skb->len); |
1da177e4 | 7478 | conn->rx_len = len - skb->len; |
d73a0988 AE |
7479 | break; |
7480 | ||
7481 | case ACL_CONT: | |
1da177e4 LT |
7482 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
7483 | ||
7484 | if (!conn->rx_len) { | |
7485 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
7486 | l2cap_conn_unreliable(conn, ECOMM); | |
7487 | goto drop; | |
7488 | } | |
7489 | ||
7490 | if (skb->len > conn->rx_len) { | |
7491 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 7492 | skb->len, conn->rx_len); |
1da177e4 LT |
7493 | kfree_skb(conn->rx_skb); |
7494 | conn->rx_skb = NULL; | |
7495 | conn->rx_len = 0; | |
7496 | l2cap_conn_unreliable(conn, ECOMM); | |
7497 | goto drop; | |
7498 | } | |
7499 | ||
d626f62b | 7500 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7501 | skb->len); |
1da177e4 LT |
7502 | conn->rx_len -= skb->len; |
7503 | ||
7504 | if (!conn->rx_len) { | |
c4e5bafa JH |
7505 | /* Complete frame received. l2cap_recv_frame |
7506 | * takes ownership of the skb so set the global | |
7507 | * rx_skb pointer to NULL first. | |
7508 | */ | |
7509 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 7510 | conn->rx_skb = NULL; |
c4e5bafa | 7511 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 7512 | } |
d73a0988 | 7513 | break; |
1da177e4 LT |
7514 | } |
7515 | ||
7516 | drop: | |
7517 | kfree_skb(skb); | |
7518 | return 0; | |
7519 | } | |
7520 | ||
aef7d97c | 7521 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 7522 | { |
23691d75 | 7523 | struct l2cap_chan *c; |
1da177e4 | 7524 | |
333055f2 | 7525 | read_lock(&chan_list_lock); |
1da177e4 | 7526 | |
23691d75 | 7527 | list_for_each_entry(c, &chan_list, global_l) { |
fcb73338 | 7528 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7eafc59e | 7529 | &c->src, &c->dst, |
fcb73338 AE |
7530 | c->state, __le16_to_cpu(c->psm), |
7531 | c->scid, c->dcid, c->imtu, c->omtu, | |
7532 | c->sec_level, c->mode); | |
61e1b4b7 | 7533 | } |
1da177e4 | 7534 | |
333055f2 | 7535 | read_unlock(&chan_list_lock); |
1da177e4 | 7536 | |
aef7d97c | 7537 | return 0; |
1da177e4 LT |
7538 | } |
7539 | ||
aef7d97c MH |
7540 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
7541 | { | |
7542 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
7543 | } | |
7544 | ||
7545 | static const struct file_operations l2cap_debugfs_fops = { | |
7546 | .open = l2cap_debugfs_open, | |
7547 | .read = seq_read, | |
7548 | .llseek = seq_lseek, | |
7549 | .release = single_release, | |
7550 | }; | |
7551 | ||
7552 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 7553 | |
64274518 | 7554 | int __init l2cap_init(void) |
1da177e4 LT |
7555 | { |
7556 | int err; | |
be9d1227 | 7557 | |
bb58f747 | 7558 | err = l2cap_init_sockets(); |
1da177e4 LT |
7559 | if (err < 0) |
7560 | return err; | |
7561 | ||
1120e4bf MH |
7562 | if (IS_ERR_OR_NULL(bt_debugfs)) |
7563 | return 0; | |
7564 | ||
7565 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
7566 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 7567 | |
40b9397a | 7568 | debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs, |
f15b8ecf | 7569 | &le_max_credits); |
40b9397a | 7570 | debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs, |
f15b8ecf JH |
7571 | &le_default_mps); |
7572 | ||
1da177e4 | 7573 | return 0; |
1da177e4 LT |
7574 | } |
7575 | ||
64274518 | 7576 | void l2cap_exit(void) |
1da177e4 | 7577 | { |
aef7d97c | 7578 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 7579 | l2cap_cleanup_sockets(); |
1da177e4 LT |
7580 | } |
7581 | ||
d1c4a17d GP |
7582 | module_param(disable_ertm, bool, 0644); |
7583 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |