Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
7ef9fbf0 | 39 | |
ac4b7236 | 40 | #include "smp.h" |
7024728e | 41 | #include "a2mp.h" |
7ef9fbf0 | 42 | #include "amp.h" |
18722c24 | 43 | #include "6lowpan.h" |
1da177e4 | 44 | |
d1de6d46 | 45 | bool disable_ertm; |
f0709e03 | 46 | |
547d1032 | 47 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD; |
d40bffbc | 48 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, }; |
1da177e4 | 49 | |
b5ad8b7f JB |
50 | static LIST_HEAD(chan_list); |
51 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 52 | |
f15b8ecf JH |
53 | static u16 le_max_credits = L2CAP_LE_MAX_CREDITS; |
54 | static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS; | |
55 | ||
1da177e4 | 56 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2d792818 | 57 | u8 code, u8 ident, u16 dlen, void *data); |
4519de9a | 58 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
2d792818 | 59 | void *data); |
710f9b0a | 60 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
5e4e3972 | 61 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); |
1da177e4 | 62 | |
d660366d | 63 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2d792818 | 64 | struct sk_buff_head *skbs, u8 event); |
608bcc6d | 65 | |
4f1654e0 MH |
66 | static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type) |
67 | { | |
68 | if (hcon->type == LE_LINK) { | |
69 | if (type == ADDR_LE_DEV_PUBLIC) | |
70 | return BDADDR_LE_PUBLIC; | |
71 | else | |
72 | return BDADDR_LE_RANDOM; | |
73 | } | |
74 | ||
75 | return BDADDR_BREDR; | |
76 | } | |
77 | ||
0139418c | 78 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 79 | |
2d792818 GP |
80 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
81 | u16 cid) | |
0139418c | 82 | { |
3df91ea2 | 83 | struct l2cap_chan *c; |
3d57dc68 | 84 | |
3df91ea2 AE |
85 | list_for_each_entry(c, &conn->chan_l, list) { |
86 | if (c->dcid == cid) | |
87 | return c; | |
0139418c | 88 | } |
3df91ea2 | 89 | return NULL; |
0139418c MH |
90 | } |
91 | ||
2d792818 GP |
92 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
93 | u16 cid) | |
0139418c | 94 | { |
3df91ea2 | 95 | struct l2cap_chan *c; |
3d57dc68 | 96 | |
3df91ea2 AE |
97 | list_for_each_entry(c, &conn->chan_l, list) { |
98 | if (c->scid == cid) | |
99 | return c; | |
0139418c | 100 | } |
3df91ea2 | 101 | return NULL; |
0139418c MH |
102 | } |
103 | ||
104 | /* Find channel with given SCID. | |
ef191ade | 105 | * Returns locked channel. */ |
2d792818 GP |
106 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
107 | u16 cid) | |
0139418c | 108 | { |
48454079 | 109 | struct l2cap_chan *c; |
baa7e1fa | 110 | |
3df91ea2 | 111 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 112 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
113 | if (c) |
114 | l2cap_chan_lock(c); | |
3df91ea2 AE |
115 | mutex_unlock(&conn->chan_lock); |
116 | ||
48454079 | 117 | return c; |
0139418c MH |
118 | } |
119 | ||
b1a130b7 MM |
120 | /* Find channel with given DCID. |
121 | * Returns locked channel. | |
122 | */ | |
123 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
124 | u16 cid) | |
125 | { | |
126 | struct l2cap_chan *c; | |
127 | ||
128 | mutex_lock(&conn->chan_lock); | |
129 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
130 | if (c) | |
131 | l2cap_chan_lock(c); | |
132 | mutex_unlock(&conn->chan_lock); | |
133 | ||
134 | return c; | |
135 | } | |
136 | ||
2d792818 GP |
137 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
138 | u8 ident) | |
0139418c | 139 | { |
3df91ea2 | 140 | struct l2cap_chan *c; |
3d57dc68 | 141 | |
3df91ea2 AE |
142 | list_for_each_entry(c, &conn->chan_l, list) { |
143 | if (c->ident == ident) | |
144 | return c; | |
0139418c | 145 | } |
3df91ea2 | 146 | return NULL; |
0139418c MH |
147 | } |
148 | ||
5b155ef9 MM |
149 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
150 | u8 ident) | |
151 | { | |
152 | struct l2cap_chan *c; | |
153 | ||
154 | mutex_lock(&conn->chan_lock); | |
155 | c = __l2cap_get_chan_by_ident(conn, ident); | |
156 | if (c) | |
157 | l2cap_chan_lock(c); | |
158 | mutex_unlock(&conn->chan_lock); | |
159 | ||
160 | return c; | |
161 | } | |
162 | ||
23691d75 | 163 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 164 | { |
23691d75 | 165 | struct l2cap_chan *c; |
9e4425ff | 166 | |
23691d75 | 167 | list_for_each_entry(c, &chan_list, global_l) { |
7eafc59e | 168 | if (c->sport == psm && !bacmp(&c->src, src)) |
250938cb | 169 | return c; |
9e4425ff | 170 | } |
250938cb | 171 | return NULL; |
9e4425ff GP |
172 | } |
173 | ||
174 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
175 | { | |
73b2ec18 GP |
176 | int err; |
177 | ||
333055f2 | 178 | write_lock(&chan_list_lock); |
9e4425ff | 179 | |
23691d75 | 180 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
181 | err = -EADDRINUSE; |
182 | goto done; | |
9e4425ff GP |
183 | } |
184 | ||
73b2ec18 GP |
185 | if (psm) { |
186 | chan->psm = psm; | |
187 | chan->sport = psm; | |
188 | err = 0; | |
189 | } else { | |
190 | u16 p; | |
191 | ||
192 | err = -EINVAL; | |
193 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 194 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
195 | chan->psm = cpu_to_le16(p); |
196 | chan->sport = cpu_to_le16(p); | |
197 | err = 0; | |
198 | break; | |
199 | } | |
200 | } | |
9e4425ff | 201 | |
73b2ec18 | 202 | done: |
333055f2 | 203 | write_unlock(&chan_list_lock); |
73b2ec18 | 204 | return err; |
9e4425ff GP |
205 | } |
206 | ||
207 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
208 | { | |
333055f2 | 209 | write_lock(&chan_list_lock); |
9e4425ff GP |
210 | |
211 | chan->scid = scid; | |
212 | ||
333055f2 | 213 | write_unlock(&chan_list_lock); |
9e4425ff GP |
214 | |
215 | return 0; | |
216 | } | |
217 | ||
baa7e1fa | 218 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 219 | { |
e77af755 | 220 | u16 cid, dyn_end; |
0139418c | 221 | |
e77af755 JH |
222 | if (conn->hcon->type == LE_LINK) |
223 | dyn_end = L2CAP_CID_LE_DYN_END; | |
224 | else | |
225 | dyn_end = L2CAP_CID_DYN_END; | |
226 | ||
227 | for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) { | |
baa7e1fa | 228 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
229 | return cid; |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
f93fa273 | 235 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 236 | { |
42d2d87c | 237 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 238 | state_to_string(state)); |
badaaa00 | 239 | |
89bc500e | 240 | chan->state = state; |
53f52121 | 241 | chan->ops->state_change(chan, state, 0); |
89bc500e GP |
242 | } |
243 | ||
f8e73017 GP |
244 | static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, |
245 | int state, int err) | |
2e0052e4 | 246 | { |
f8e73017 | 247 | chan->state = state; |
53f52121 | 248 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
249 | } |
250 | ||
251 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
252 | { | |
f8e73017 | 253 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
254 | } |
255 | ||
4239d16f MM |
256 | static void __set_retrans_timer(struct l2cap_chan *chan) |
257 | { | |
258 | if (!delayed_work_pending(&chan->monitor_timer) && | |
259 | chan->retrans_timeout) { | |
260 | l2cap_set_timer(chan, &chan->retrans_timer, | |
261 | msecs_to_jiffies(chan->retrans_timeout)); | |
262 | } | |
263 | } | |
264 | ||
265 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
266 | { | |
267 | __clear_retrans_timer(chan); | |
268 | if (chan->monitor_timeout) { | |
269 | l2cap_set_timer(chan, &chan->monitor_timer, | |
270 | msecs_to_jiffies(chan->monitor_timeout)); | |
271 | } | |
272 | } | |
273 | ||
608bcc6d MM |
274 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
275 | u16 seq) | |
276 | { | |
277 | struct sk_buff *skb; | |
278 | ||
279 | skb_queue_walk(head, skb) { | |
280 | if (bt_cb(skb)->control.txseq == seq) | |
281 | return skb; | |
282 | } | |
283 | ||
284 | return NULL; | |
285 | } | |
286 | ||
3c588192 MM |
287 | /* ---- L2CAP sequence number lists ---- */ |
288 | ||
289 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
290 | * SREJ requests that are received and for frames that are to be | |
291 | * retransmitted. These seq_list functions implement a singly-linked | |
292 | * list in an array, where membership in the list can also be checked | |
293 | * in constant time. Items can also be added to the tail of the list | |
294 | * and removed from the head in constant time, without further memory | |
295 | * allocs or frees. | |
296 | */ | |
297 | ||
298 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
299 | { | |
300 | size_t alloc_size, i; | |
301 | ||
302 | /* Allocated size is a power of 2 to map sequence numbers | |
303 | * (which may be up to 14 bits) in to a smaller array that is | |
304 | * sized for the negotiated ERTM transmit windows. | |
305 | */ | |
306 | alloc_size = roundup_pow_of_two(size); | |
307 | ||
308 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
309 | if (!seq_list->list) | |
310 | return -ENOMEM; | |
311 | ||
312 | seq_list->mask = alloc_size - 1; | |
313 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
314 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
315 | for (i = 0; i < alloc_size; i++) | |
316 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
322 | { | |
323 | kfree(seq_list->list); | |
324 | } | |
325 | ||
326 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
327 | u16 seq) | |
328 | { | |
329 | /* Constant-time check for list membership */ | |
330 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
331 | } | |
332 | ||
03a0c5d6 | 333 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) |
3c588192 | 334 | { |
03a0c5d6 | 335 | u16 seq = seq_list->head; |
3c588192 MM |
336 | u16 mask = seq_list->mask; |
337 | ||
03a0c5d6 JH |
338 | seq_list->head = seq_list->list[seq & mask]; |
339 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
340 | ||
341 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
342 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
343 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 | 344 | } |
3c588192 | 345 | |
03a0c5d6 | 346 | return seq; |
3c588192 MM |
347 | } |
348 | ||
349 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
350 | { | |
f522ae36 | 351 | u16 i; |
3c588192 | 352 | |
f522ae36 GP |
353 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
354 | return; | |
355 | ||
356 | for (i = 0; i <= seq_list->mask; i++) | |
357 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
358 | ||
359 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
360 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
361 | } |
362 | ||
363 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
364 | { | |
365 | u16 mask = seq_list->mask; | |
366 | ||
367 | /* All appends happen in constant time */ | |
368 | ||
f522ae36 GP |
369 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
370 | return; | |
3c588192 | 371 | |
f522ae36 GP |
372 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
373 | seq_list->head = seq; | |
374 | else | |
375 | seq_list->list[seq_list->tail & mask] = seq; | |
376 | ||
377 | seq_list->tail = seq; | |
378 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
379 | } |
380 | ||
721c4181 | 381 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 382 | { |
721c4181 | 383 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 384 | chan_timer.work); |
3df91ea2 | 385 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
386 | int reason; |
387 | ||
e05dcc32 | 388 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 389 | |
3df91ea2 | 390 | mutex_lock(&conn->chan_lock); |
6be36555 | 391 | l2cap_chan_lock(chan); |
ab07801d | 392 | |
89bc500e | 393 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 394 | reason = ECONNREFUSED; |
89bc500e | 395 | else if (chan->state == BT_CONNECT && |
2d792818 | 396 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
397 | reason = ECONNREFUSED; |
398 | else | |
399 | reason = ETIMEDOUT; | |
400 | ||
0f852724 | 401 | l2cap_chan_close(chan, reason); |
ab07801d | 402 | |
6be36555 | 403 | l2cap_chan_unlock(chan); |
ab07801d | 404 | |
80b98027 | 405 | chan->ops->close(chan); |
3df91ea2 AE |
406 | mutex_unlock(&conn->chan_lock); |
407 | ||
371fd835 | 408 | l2cap_chan_put(chan); |
ab07801d GP |
409 | } |
410 | ||
eef1d9b6 | 411 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
412 | { |
413 | struct l2cap_chan *chan; | |
414 | ||
415 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
416 | if (!chan) | |
417 | return NULL; | |
418 | ||
c03b355e AE |
419 | mutex_init(&chan->lock); |
420 | ||
333055f2 | 421 | write_lock(&chan_list_lock); |
23691d75 | 422 | list_add(&chan->global_l, &chan_list); |
333055f2 | 423 | write_unlock(&chan_list_lock); |
23691d75 | 424 | |
721c4181 | 425 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 426 | |
89bc500e GP |
427 | chan->state = BT_OPEN; |
428 | ||
144ad330 | 429 | kref_init(&chan->kref); |
71ba0e56 | 430 | |
2827011f MM |
431 | /* This flag is cleared in l2cap_chan_ready() */ |
432 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
433 | ||
eef1d9b6 | 434 | BT_DBG("chan %p", chan); |
abc545b8 | 435 | |
48454079 GP |
436 | return chan; |
437 | } | |
438 | ||
144ad330 | 439 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 440 | { |
144ad330 SS |
441 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
442 | ||
4af66c69 JK |
443 | BT_DBG("chan %p", chan); |
444 | ||
333055f2 | 445 | write_lock(&chan_list_lock); |
23691d75 | 446 | list_del(&chan->global_l); |
333055f2 | 447 | write_unlock(&chan_list_lock); |
23691d75 | 448 | |
4af66c69 | 449 | kfree(chan); |
6ff5abbf GP |
450 | } |
451 | ||
30648372 JK |
452 | void l2cap_chan_hold(struct l2cap_chan *c) |
453 | { | |
144ad330 | 454 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 455 | |
144ad330 | 456 | kref_get(&c->kref); |
30648372 JK |
457 | } |
458 | ||
459 | void l2cap_chan_put(struct l2cap_chan *c) | |
460 | { | |
144ad330 | 461 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 462 | |
144ad330 | 463 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 JK |
464 | } |
465 | ||
bd4b1653 AE |
466 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
467 | { | |
468 | chan->fcs = L2CAP_FCS_CRC16; | |
469 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
470 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
471 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
c20f8e35 | 472 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 AE |
473 | chan->sec_level = BT_SECURITY_LOW; |
474 | ||
475 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
476 | } | |
477 | ||
0ce43ce6 | 478 | static void l2cap_le_flowctl_init(struct l2cap_chan *chan) |
38319713 | 479 | { |
0ce43ce6 JH |
480 | chan->sdu = NULL; |
481 | chan->sdu_last_frag = NULL; | |
482 | chan->sdu_len = 0; | |
0cd75f7e | 483 | chan->tx_credits = 0; |
f15b8ecf | 484 | chan->rx_credits = le_max_credits; |
d1d79413 | 485 | chan->mps = min_t(u16, chan->imtu, le_default_mps); |
0ce43ce6 JH |
486 | |
487 | skb_queue_head_init(&chan->tx_q); | |
38319713 JH |
488 | } |
489 | ||
93c3e8f5 | 490 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 491 | { |
af05b30b | 492 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 493 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 494 | |
9f5a0d7b | 495 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 496 | |
8c1d787b | 497 | chan->conn = conn; |
0139418c | 498 | |
5491120e AE |
499 | switch (chan->chan_type) { |
500 | case L2CAP_CHAN_CONN_ORIENTED: | |
21626e62 JH |
501 | /* Alloc CID for connection-oriented socket */ |
502 | chan->scid = l2cap_alloc_cid(conn); | |
503 | if (conn->hcon->type == ACL_LINK) | |
0c1bc5c6 | 504 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
505 | break; |
506 | ||
507 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 508 | /* Connectionless socket */ |
fe4128e0 GP |
509 | chan->scid = L2CAP_CID_CONN_LESS; |
510 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 511 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
512 | break; |
513 | ||
2338a7e0 JH |
514 | case L2CAP_CHAN_FIXED: |
515 | /* Caller will set CID and CID specific MTU values */ | |
416fa752 AE |
516 | break; |
517 | ||
5491120e | 518 | default: |
0139418c | 519 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
520 | chan->scid = L2CAP_CID_SIGNALING; |
521 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 522 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
523 | } |
524 | ||
8f7975b1 AE |
525 | chan->local_id = L2CAP_BESTEFFORT_ID; |
526 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
527 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
528 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
529 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 530 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 531 | |
371fd835 | 532 | l2cap_chan_hold(chan); |
baa7e1fa | 533 | |
5ee9891d JH |
534 | hci_conn_hold(conn->hcon); |
535 | ||
3df91ea2 | 536 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
537 | } |
538 | ||
466f8004 | 539 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
540 | { |
541 | mutex_lock(&conn->chan_lock); | |
542 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 543 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
544 | } |
545 | ||
466f8004 | 546 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 547 | { |
8c1d787b | 548 | struct l2cap_conn *conn = chan->conn; |
0139418c | 549 | |
c9b66675 | 550 | __clear_chan_timer(chan); |
0139418c | 551 | |
49208c9c | 552 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 553 | |
8e87d142 | 554 | if (conn) { |
56f60984 | 555 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 556 | /* Delete from channel list */ |
3df91ea2 | 557 | list_del(&chan->list); |
3d57dc68 | 558 | |
371fd835 | 559 | l2cap_chan_put(chan); |
baa7e1fa | 560 | |
8c1d787b | 561 | chan->conn = NULL; |
3cabbfda | 562 | |
2338a7e0 | 563 | if (chan->scid != L2CAP_CID_A2MP) |
76a68ba0 | 564 | hci_conn_drop(conn->hcon); |
56f60984 AE |
565 | |
566 | if (mgr && mgr->bredr_chan == chan) | |
567 | mgr->bredr_chan = NULL; | |
0139418c MH |
568 | } |
569 | ||
419e08c1 AE |
570 | if (chan->hs_hchan) { |
571 | struct hci_chan *hs_hchan = chan->hs_hchan; | |
572 | ||
573 | BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); | |
574 | amp_disconnect_logical_link(hs_hchan); | |
575 | } | |
576 | ||
b699ec0d | 577 | chan->ops->teardown(chan, err); |
6be36555 | 578 | |
2827011f | 579 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 580 | return; |
2ead70b8 | 581 | |
ee556f66 GP |
582 | switch(chan->mode) { |
583 | case L2CAP_MODE_BASIC: | |
584 | break; | |
c13ffa62 | 585 | |
38319713 | 586 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b | 587 | skb_queue_purge(&chan->tx_q); |
38319713 JH |
588 | break; |
589 | ||
ee556f66 | 590 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
591 | __clear_retrans_timer(chan); |
592 | __clear_monitor_timer(chan); | |
593 | __clear_ack_timer(chan); | |
c13ffa62 | 594 | |
f1c6775b | 595 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 596 | |
3c588192 MM |
597 | l2cap_seq_list_free(&chan->srej_list); |
598 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
599 | |
600 | /* fall through */ | |
601 | ||
602 | case L2CAP_MODE_STREAMING: | |
603 | skb_queue_purge(&chan->tx_q); | |
604 | break; | |
c13ffa62 | 605 | } |
ee556f66 GP |
606 | |
607 | return; | |
0139418c MH |
608 | } |
609 | ||
27e2d4c8 JH |
610 | static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) |
611 | { | |
612 | struct l2cap_conn *conn = chan->conn; | |
613 | struct l2cap_le_conn_rsp rsp; | |
614 | u16 result; | |
615 | ||
616 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
617 | result = L2CAP_CR_AUTHORIZATION; | |
618 | else | |
619 | result = L2CAP_CR_BAD_PSM; | |
620 | ||
621 | l2cap_state_change(chan, BT_DISCONN); | |
622 | ||
623 | rsp.dcid = cpu_to_le16(chan->scid); | |
624 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 625 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 626 | rsp.credits = cpu_to_le16(chan->rx_credits); |
27e2d4c8 JH |
627 | rsp.result = cpu_to_le16(result); |
628 | ||
629 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
630 | &rsp); | |
631 | } | |
632 | ||
791d60f7 JH |
633 | static void l2cap_chan_connect_reject(struct l2cap_chan *chan) |
634 | { | |
635 | struct l2cap_conn *conn = chan->conn; | |
636 | struct l2cap_conn_rsp rsp; | |
637 | u16 result; | |
638 | ||
639 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
640 | result = L2CAP_CR_SEC_BLOCK; | |
641 | else | |
642 | result = L2CAP_CR_BAD_PSM; | |
643 | ||
644 | l2cap_state_change(chan, BT_DISCONN); | |
645 | ||
646 | rsp.scid = cpu_to_le16(chan->dcid); | |
647 | rsp.dcid = cpu_to_le16(chan->scid); | |
648 | rsp.result = cpu_to_le16(result); | |
649 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
650 | ||
651 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
652 | } | |
653 | ||
0f852724 | 654 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
655 | { |
656 | struct l2cap_conn *conn = chan->conn; | |
4519de9a | 657 | |
7eafc59e | 658 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
4519de9a | 659 | |
89bc500e | 660 | switch (chan->state) { |
4519de9a | 661 | case BT_LISTEN: |
b699ec0d | 662 | chan->ops->teardown(chan, 0); |
4519de9a GP |
663 | break; |
664 | ||
665 | case BT_CONNECTED: | |
666 | case BT_CONFIG: | |
cea04ce3 JH |
667 | /* ATT uses L2CAP_CHAN_CONN_ORIENTED so we must also |
668 | * check for chan->psm. | |
669 | */ | |
670 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && chan->psm) { | |
8d836d71 | 671 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
5e4e3972 | 672 | l2cap_send_disconn_req(chan, reason); |
4519de9a GP |
673 | } else |
674 | l2cap_chan_del(chan, reason); | |
675 | break; | |
676 | ||
677 | case BT_CONNECT2: | |
791d60f7 JH |
678 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
679 | if (conn->hcon->type == ACL_LINK) | |
680 | l2cap_chan_connect_reject(chan); | |
27e2d4c8 JH |
681 | else if (conn->hcon->type == LE_LINK) |
682 | l2cap_chan_le_connect_reject(chan); | |
4519de9a GP |
683 | } |
684 | ||
685 | l2cap_chan_del(chan, reason); | |
686 | break; | |
687 | ||
688 | case BT_CONNECT: | |
689 | case BT_DISCONN: | |
690 | l2cap_chan_del(chan, reason); | |
691 | break; | |
692 | ||
693 | default: | |
b699ec0d | 694 | chan->ops->teardown(chan, 0); |
4519de9a GP |
695 | break; |
696 | } | |
697 | } | |
698 | ||
4343478f | 699 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 700 | { |
6a974b50 MH |
701 | switch (chan->chan_type) { |
702 | case L2CAP_CHAN_RAW: | |
4343478f | 703 | switch (chan->sec_level) { |
8556edd3 | 704 | case BT_SECURITY_HIGH: |
7d513e92 | 705 | case BT_SECURITY_FIPS: |
8556edd3 JH |
706 | return HCI_AT_DEDICATED_BONDING_MITM; |
707 | case BT_SECURITY_MEDIUM: | |
708 | return HCI_AT_DEDICATED_BONDING; | |
709 | default: | |
710 | return HCI_AT_NO_BONDING; | |
711 | } | |
6a974b50 | 712 | break; |
3124b843 MH |
713 | case L2CAP_CHAN_CONN_LESS: |
714 | if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) { | |
715 | if (chan->sec_level == BT_SECURITY_LOW) | |
716 | chan->sec_level = BT_SECURITY_SDP; | |
717 | } | |
7d513e92 MH |
718 | if (chan->sec_level == BT_SECURITY_HIGH || |
719 | chan->sec_level == BT_SECURITY_FIPS) | |
3124b843 MH |
720 | return HCI_AT_NO_BONDING_MITM; |
721 | else | |
722 | return HCI_AT_NO_BONDING; | |
723 | break; | |
6a974b50 MH |
724 | case L2CAP_CHAN_CONN_ORIENTED: |
725 | if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) { | |
726 | if (chan->sec_level == BT_SECURITY_LOW) | |
727 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 728 | |
7d513e92 MH |
729 | if (chan->sec_level == BT_SECURITY_HIGH || |
730 | chan->sec_level == BT_SECURITY_FIPS) | |
6a974b50 MH |
731 | return HCI_AT_NO_BONDING_MITM; |
732 | else | |
733 | return HCI_AT_NO_BONDING; | |
734 | } | |
735 | /* fall through */ | |
736 | default: | |
4343478f | 737 | switch (chan->sec_level) { |
00ae4af9 | 738 | case BT_SECURITY_HIGH: |
7d513e92 | 739 | case BT_SECURITY_FIPS: |
8556edd3 | 740 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 741 | case BT_SECURITY_MEDIUM: |
8556edd3 | 742 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 743 | default: |
8556edd3 | 744 | return HCI_AT_NO_BONDING; |
00ae4af9 | 745 | } |
6a974b50 | 746 | break; |
0684e5f9 | 747 | } |
8556edd3 JH |
748 | } |
749 | ||
750 | /* Service level security */ | |
d45fc423 | 751 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 752 | { |
8c1d787b | 753 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
754 | __u8 auth_type; |
755 | ||
a17de2fe JH |
756 | if (conn->hcon->type == LE_LINK) |
757 | return smp_conn_security(conn->hcon, chan->sec_level); | |
758 | ||
4343478f | 759 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 760 | |
4343478f | 761 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
762 | } |
763 | ||
b5ad8b7f | 764 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
765 | { |
766 | u8 id; | |
767 | ||
768 | /* Get next available identificator. | |
769 | * 1 - 128 are used by kernel. | |
770 | * 129 - 199 are reserved. | |
771 | * 200 - 254 are used by utilities like l2ping, etc. | |
772 | */ | |
773 | ||
333055f2 | 774 | spin_lock(&conn->lock); |
4e8402a3 MH |
775 | |
776 | if (++conn->tx_ident > 128) | |
777 | conn->tx_ident = 1; | |
778 | ||
779 | id = conn->tx_ident; | |
780 | ||
333055f2 | 781 | spin_unlock(&conn->lock); |
4e8402a3 MH |
782 | |
783 | return id; | |
784 | } | |
785 | ||
2d792818 GP |
786 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
787 | void *data) | |
4e8402a3 MH |
788 | { |
789 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 790 | u8 flags; |
4e8402a3 MH |
791 | |
792 | BT_DBG("code 0x%2.2x", code); | |
793 | ||
794 | if (!skb) | |
9a9c6a34 | 795 | return; |
4e8402a3 | 796 | |
e702112f AE |
797 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
798 | flags = ACL_START_NO_FLUSH; | |
799 | else | |
800 | flags = ACL_START; | |
801 | ||
14b12d0b | 802 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 803 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 804 | |
73d80deb LAD |
805 | hci_send_acl(conn->hchan, skb, flags); |
806 | } | |
807 | ||
02b0fbb9 MM |
808 | static bool __chan_is_moving(struct l2cap_chan *chan) |
809 | { | |
810 | return chan->move_state != L2CAP_MOVE_STABLE && | |
811 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
812 | } | |
813 | ||
73d80deb LAD |
814 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
815 | { | |
816 | struct hci_conn *hcon = chan->conn->hcon; | |
817 | u16 flags; | |
818 | ||
819 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 820 | skb->priority); |
73d80deb | 821 | |
d5f8a75d MM |
822 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
823 | if (chan->hs_hchan) | |
824 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
825 | else | |
826 | kfree_skb(skb); | |
827 | ||
828 | return; | |
829 | } | |
830 | ||
73d80deb | 831 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
2d792818 | 832 | lmp_no_flush_capable(hcon->hdev)) |
73d80deb LAD |
833 | flags = ACL_START_NO_FLUSH; |
834 | else | |
835 | flags = ACL_START; | |
14b12d0b | 836 | |
73d80deb LAD |
837 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
838 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
839 | } |
840 | ||
b76bbd66 MM |
841 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
842 | { | |
843 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
844 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
845 | ||
846 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
847 | /* S-Frame */ | |
848 | control->sframe = 1; | |
849 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
850 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
851 | ||
852 | control->sar = 0; | |
853 | control->txseq = 0; | |
854 | } else { | |
855 | /* I-Frame */ | |
856 | control->sframe = 0; | |
857 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
858 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
859 | ||
860 | control->poll = 0; | |
861 | control->super = 0; | |
862 | } | |
863 | } | |
864 | ||
b76bbd66 MM |
865 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
866 | { | |
867 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
868 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
869 | ||
870 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
871 | /* S-Frame */ | |
872 | control->sframe = 1; | |
873 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
874 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
875 | ||
876 | control->sar = 0; | |
877 | control->txseq = 0; | |
878 | } else { | |
879 | /* I-Frame */ | |
880 | control->sframe = 0; | |
881 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
882 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
883 | ||
884 | control->poll = 0; | |
885 | control->super = 0; | |
886 | } | |
887 | } | |
888 | ||
889 | static inline void __unpack_control(struct l2cap_chan *chan, | |
890 | struct sk_buff *skb) | |
891 | { | |
892 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
893 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
894 | &bt_cb(skb)->control); | |
cec8ab6e | 895 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
896 | } else { |
897 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
898 | &bt_cb(skb)->control); | |
cec8ab6e | 899 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
900 | } |
901 | } | |
902 | ||
b5c6aaed MM |
903 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
904 | { | |
905 | u32 packed; | |
906 | ||
907 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
908 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
909 | ||
910 | if (control->sframe) { | |
911 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
912 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
913 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
914 | } else { | |
915 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
916 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
917 | } | |
918 | ||
919 | return packed; | |
920 | } | |
921 | ||
922 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
923 | { | |
924 | u16 packed; | |
925 | ||
926 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
927 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
928 | ||
929 | if (control->sframe) { | |
930 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
931 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
932 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
933 | } else { | |
934 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
935 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
936 | } | |
937 | ||
938 | return packed; | |
939 | } | |
940 | ||
b76bbd66 MM |
941 | static inline void __pack_control(struct l2cap_chan *chan, |
942 | struct l2cap_ctrl *control, | |
943 | struct sk_buff *skb) | |
944 | { | |
945 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
946 | put_unaligned_le32(__pack_extended_control(control), | |
947 | skb->data + L2CAP_HDR_SIZE); | |
948 | } else { | |
949 | put_unaligned_le16(__pack_enhanced_control(control), | |
950 | skb->data + L2CAP_HDR_SIZE); | |
951 | } | |
952 | } | |
953 | ||
ba7aa64f GP |
954 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
955 | { | |
956 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
957 | return L2CAP_EXT_HDR_SIZE; | |
958 | else | |
959 | return L2CAP_ENH_HDR_SIZE; | |
960 | } | |
961 | ||
a67d7f6f MM |
962 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
963 | u32 control) | |
b5c6aaed MM |
964 | { |
965 | struct sk_buff *skb; | |
966 | struct l2cap_hdr *lh; | |
ba7aa64f | 967 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
968 | |
969 | if (chan->fcs == L2CAP_FCS_CRC16) | |
970 | hlen += L2CAP_FCS_SIZE; | |
971 | ||
a67d7f6f | 972 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 973 | |
b5c6aaed | 974 | if (!skb) |
a67d7f6f | 975 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
976 | |
977 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
978 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
979 | lh->cid = cpu_to_le16(chan->dcid); | |
980 | ||
a67d7f6f MM |
981 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
982 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
983 | else | |
984 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
985 | |
986 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 987 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
988 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
989 | } | |
990 | ||
991 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
992 | return skb; |
993 | } | |
994 | ||
995 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
996 | struct l2cap_ctrl *control) | |
997 | { | |
998 | struct sk_buff *skb; | |
999 | u32 control_field; | |
1000 | ||
1001 | BT_DBG("chan %p, control %p", chan, control); | |
1002 | ||
1003 | if (!control->sframe) | |
1004 | return; | |
1005 | ||
b99e13ad MM |
1006 | if (__chan_is_moving(chan)) |
1007 | return; | |
1008 | ||
a67d7f6f MM |
1009 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
1010 | !control->poll) | |
1011 | control->final = 1; | |
1012 | ||
1013 | if (control->super == L2CAP_SUPER_RR) | |
1014 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
1015 | else if (control->super == L2CAP_SUPER_RNR) | |
1016 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
1017 | ||
1018 | if (control->super != L2CAP_SUPER_SREJ) { | |
1019 | chan->last_acked_seq = control->reqseq; | |
1020 | __clear_ack_timer(chan); | |
1021 | } | |
1022 | ||
1023 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
1024 | control->final, control->poll, control->super); | |
1025 | ||
1026 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1027 | control_field = __pack_extended_control(control); | |
1028 | else | |
1029 | control_field = __pack_enhanced_control(control); | |
1030 | ||
1031 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
1032 | if (!IS_ERR(skb)) | |
1033 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
1034 | } |
1035 | ||
c9e3d5e0 | 1036 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 1037 | { |
c9e3d5e0 MM |
1038 | struct l2cap_ctrl control; |
1039 | ||
1040 | BT_DBG("chan %p, poll %d", chan, poll); | |
1041 | ||
1042 | memset(&control, 0, sizeof(control)); | |
1043 | control.sframe = 1; | |
1044 | control.poll = poll; | |
1045 | ||
1046 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
1047 | control.super = L2CAP_SUPER_RNR; | |
1048 | else | |
1049 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1050 | |
c9e3d5e0 MM |
1051 | control.reqseq = chan->buffer_seq; |
1052 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1053 | } |
1054 | ||
b4450035 | 1055 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1056 | { |
c1360a1c | 1057 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1058 | } |
1059 | ||
1df7b17a | 1060 | static bool __amp_capable(struct l2cap_chan *chan) |
80d58d0b | 1061 | { |
1df7b17a | 1062 | struct l2cap_conn *conn = chan->conn; |
80d58d0b | 1063 | struct hci_dev *hdev; |
1df7b17a MH |
1064 | bool amp_available = false; |
1065 | ||
1066 | if (!conn->hs_enabled) | |
1067 | return false; | |
1068 | ||
1069 | if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP)) | |
1070 | return false; | |
80d58d0b MH |
1071 | |
1072 | read_lock(&hci_dev_list_lock); | |
1df7b17a | 1073 | list_for_each_entry(hdev, &hci_dev_list, list) { |
80d58d0b | 1074 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1df7b17a MH |
1075 | test_bit(HCI_UP, &hdev->flags)) { |
1076 | amp_available = true; | |
1077 | break; | |
1078 | } | |
1079 | } | |
80d58d0b MH |
1080 | read_unlock(&hci_dev_list_lock); |
1081 | ||
1df7b17a MH |
1082 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1083 | return amp_available; | |
848566b3 MH |
1084 | |
1085 | return false; | |
93c3e8f5 AE |
1086 | } |
1087 | ||
5ce66b59 AE |
1088 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1089 | { | |
1090 | /* Check EFS parameters */ | |
1091 | return true; | |
1092 | } | |
1093 | ||
2766be48 | 1094 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1095 | { |
1096 | struct l2cap_conn *conn = chan->conn; | |
1097 | struct l2cap_conn_req req; | |
1098 | ||
1099 | req.scid = cpu_to_le16(chan->scid); | |
1100 | req.psm = chan->psm; | |
1101 | ||
1102 | chan->ident = l2cap_get_ident(conn); | |
1103 | ||
1104 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1105 | ||
1106 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1107 | } | |
1108 | ||
8eb200bd MM |
1109 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1110 | { | |
1111 | struct l2cap_create_chan_req req; | |
1112 | req.scid = cpu_to_le16(chan->scid); | |
1113 | req.psm = chan->psm; | |
1114 | req.amp_id = amp_id; | |
1115 | ||
1116 | chan->ident = l2cap_get_ident(chan->conn); | |
1117 | ||
1118 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1119 | sizeof(req), &req); | |
1120 | } | |
1121 | ||
02b0fbb9 MM |
1122 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1123 | { | |
1124 | struct sk_buff *skb; | |
1125 | ||
1126 | BT_DBG("chan %p", chan); | |
1127 | ||
1128 | if (chan->mode != L2CAP_MODE_ERTM) | |
1129 | return; | |
1130 | ||
1131 | __clear_retrans_timer(chan); | |
1132 | __clear_monitor_timer(chan); | |
1133 | __clear_ack_timer(chan); | |
1134 | ||
1135 | chan->retry_count = 0; | |
1136 | skb_queue_walk(&chan->tx_q, skb) { | |
1137 | if (bt_cb(skb)->control.retries) | |
1138 | bt_cb(skb)->control.retries = 1; | |
1139 | else | |
1140 | break; | |
1141 | } | |
1142 | ||
1143 | chan->expected_tx_seq = chan->buffer_seq; | |
1144 | ||
1145 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1146 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1147 | l2cap_seq_list_clear(&chan->retrans_list); | |
1148 | l2cap_seq_list_clear(&chan->srej_list); | |
1149 | skb_queue_purge(&chan->srej_q); | |
1150 | ||
1151 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1152 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1153 | ||
1154 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1155 | } | |
1156 | ||
5f3847a4 MM |
1157 | static void l2cap_move_done(struct l2cap_chan *chan) |
1158 | { | |
1159 | u8 move_role = chan->move_role; | |
1160 | BT_DBG("chan %p", chan); | |
1161 | ||
1162 | chan->move_state = L2CAP_MOVE_STABLE; | |
1163 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1164 | ||
1165 | if (chan->mode != L2CAP_MODE_ERTM) | |
1166 | return; | |
1167 | ||
1168 | switch (move_role) { | |
1169 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1170 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1171 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1172 | break; | |
1173 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1174 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1175 | break; | |
1176 | } | |
1177 | } | |
1178 | ||
9f0caeb1 VCG |
1179 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1180 | { | |
2827011f | 1181 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1182 | chan->conf_state = 0; |
1183 | __clear_chan_timer(chan); | |
1184 | ||
0ce43ce6 JH |
1185 | if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) |
1186 | chan->ops->suspend(chan); | |
177f8f2b | 1187 | |
54a59aa2 | 1188 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1189 | |
fd83e2c2 | 1190 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1191 | } |
1192 | ||
f1496dee JH |
1193 | static void l2cap_le_connect(struct l2cap_chan *chan) |
1194 | { | |
1195 | struct l2cap_conn *conn = chan->conn; | |
1196 | struct l2cap_le_conn_req req; | |
1197 | ||
595177f3 JH |
1198 | if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags)) |
1199 | return; | |
1200 | ||
f1496dee JH |
1201 | req.psm = chan->psm; |
1202 | req.scid = cpu_to_le16(chan->scid); | |
1203 | req.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 1204 | req.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 1205 | req.credits = cpu_to_le16(chan->rx_credits); |
f1496dee JH |
1206 | |
1207 | chan->ident = l2cap_get_ident(conn); | |
1208 | ||
1209 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, | |
1210 | sizeof(req), &req); | |
1211 | } | |
1212 | ||
1213 | static void l2cap_le_start(struct l2cap_chan *chan) | |
1214 | { | |
1215 | struct l2cap_conn *conn = chan->conn; | |
1216 | ||
1217 | if (!smp_conn_security(conn->hcon, chan->sec_level)) | |
1218 | return; | |
1219 | ||
1220 | if (!chan->psm) { | |
1221 | l2cap_chan_ready(chan); | |
1222 | return; | |
1223 | } | |
1224 | ||
1225 | if (chan->state == BT_CONNECT) | |
1226 | l2cap_le_connect(chan); | |
1227 | } | |
1228 | ||
93c3e8f5 AE |
1229 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1230 | { | |
1231 | if (__amp_capable(chan)) { | |
1232 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1233 | a2mp_discover_amp(chan); | |
f1496dee JH |
1234 | } else if (chan->conn->hcon->type == LE_LINK) { |
1235 | l2cap_le_start(chan); | |
93c3e8f5 AE |
1236 | } else { |
1237 | l2cap_send_conn_req(chan); | |
1238 | } | |
1239 | } | |
1240 | ||
fc7f8a7e | 1241 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1242 | { |
8c1d787b | 1243 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1244 | |
9f0caeb1 | 1245 | if (conn->hcon->type == LE_LINK) { |
96ac34fb | 1246 | l2cap_le_start(chan); |
9f0caeb1 VCG |
1247 | return; |
1248 | } | |
1249 | ||
79d554a6 | 1250 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
1251 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1252 | return; | |
1253 | ||
d45fc423 | 1254 | if (l2cap_chan_check_security(chan) && |
2d792818 | 1255 | __l2cap_no_conn_pending(chan)) { |
93c3e8f5 AE |
1256 | l2cap_start_connection(chan); |
1257 | } | |
79d554a6 MH |
1258 | } else { |
1259 | struct l2cap_info_req req; | |
ac73498c | 1260 | req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
1261 | |
1262 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1263 | conn->info_ident = l2cap_get_ident(conn); | |
1264 | ||
ba13ccd9 | 1265 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 1266 | |
2d792818 GP |
1267 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
1268 | sizeof(req), &req); | |
79d554a6 MH |
1269 | } |
1270 | } | |
1271 | ||
cf6c2c0b GP |
1272 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1273 | { | |
1274 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1275 | if (!disable_ertm) |
cf6c2c0b GP |
1276 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1277 | ||
1278 | switch (mode) { | |
1279 | case L2CAP_MODE_ERTM: | |
1280 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1281 | case L2CAP_MODE_STREAMING: | |
1282 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1283 | default: | |
1284 | return 0x00; | |
1285 | } | |
1286 | } | |
1287 | ||
5e4e3972 | 1288 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1289 | { |
5e4e3972 | 1290 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1291 | struct l2cap_disconn_req req; |
1292 | ||
c13ffa62 GP |
1293 | if (!conn) |
1294 | return; | |
1295 | ||
aad3d0e3 | 1296 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1297 | __clear_retrans_timer(chan); |
1298 | __clear_monitor_timer(chan); | |
1299 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1300 | } |
1301 | ||
2338a7e0 | 1302 | if (chan->scid == L2CAP_CID_A2MP) { |
d117773c | 1303 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1304 | return; |
1305 | } | |
1306 | ||
fe4128e0 GP |
1307 | req.dcid = cpu_to_le16(chan->dcid); |
1308 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1309 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1310 | sizeof(req), &req); | |
c13ffa62 | 1311 | |
f8e73017 | 1312 | l2cap_state_change_and_error(chan, BT_DISCONN, err); |
22121fc9 GP |
1313 | } |
1314 | ||
1da177e4 | 1315 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1316 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1317 | { | |
3df91ea2 | 1318 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1319 | |
1320 | BT_DBG("conn %p", conn); | |
1321 | ||
3df91ea2 | 1322 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1323 | |
3df91ea2 | 1324 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6be36555 | 1325 | l2cap_chan_lock(chan); |
4e8402a3 | 1326 | |
715ec005 | 1327 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1328 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1329 | continue; |
1330 | } | |
1331 | ||
89bc500e | 1332 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1333 | if (!l2cap_chan_check_security(chan) || |
2d792818 | 1334 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1335 | l2cap_chan_unlock(chan); |
47731de7 GP |
1336 | continue; |
1337 | } | |
79d554a6 | 1338 | |
c1360a1c | 1339 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1340 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1341 | &chan->conf_state)) { |
89bc500e | 1342 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1343 | l2cap_chan_unlock(chan); |
47731de7 | 1344 | continue; |
b1235d79 | 1345 | } |
47731de7 | 1346 | |
93c3e8f5 | 1347 | l2cap_start_connection(chan); |
47731de7 | 1348 | |
89bc500e | 1349 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1350 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1351 | char buf[128]; |
fe4128e0 GP |
1352 | rsp.scid = cpu_to_le16(chan->dcid); |
1353 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1354 | |
d45fc423 | 1355 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 1356 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
ac73498c AE |
1357 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1358 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1359 | chan->ops->defer(chan); |
f66dc81f MH |
1360 | |
1361 | } else { | |
acdcabf5 | 1362 | l2cap_state_change(chan, BT_CONFIG); |
ac73498c AE |
1363 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
1364 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1365 | } |
79d554a6 | 1366 | } else { |
ac73498c AE |
1367 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND); |
1368 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1369 | } |
1370 | ||
fc7f8a7e | 1371 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1372 | sizeof(rsp), &rsp); |
e9aeb2dd | 1373 | |
c1360a1c | 1374 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1375 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1376 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1377 | continue; |
1378 | } | |
1379 | ||
c1360a1c | 1380 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1381 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1382 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1383 | chan->num_conf_req++; |
4e8402a3 MH |
1384 | } |
1385 | ||
6be36555 | 1386 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1387 | } |
1388 | ||
3df91ea2 | 1389 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1390 | } |
1391 | ||
c2287681 | 1392 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1393 | * Returns closest match, locked. |
1394 | */ | |
d9b88702 | 1395 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1396 | bdaddr_t *src, |
1397 | bdaddr_t *dst) | |
b62f328b | 1398 | { |
23691d75 | 1399 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1400 | |
23691d75 | 1401 | read_lock(&chan_list_lock); |
b62f328b | 1402 | |
23691d75 | 1403 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1404 | if (state && c->state != state) |
b62f328b VT |
1405 | continue; |
1406 | ||
23691d75 | 1407 | if (c->scid == cid) { |
c2287681 IY |
1408 | int src_match, dst_match; |
1409 | int src_any, dst_any; | |
1410 | ||
b62f328b | 1411 | /* Exact match. */ |
7eafc59e MH |
1412 | src_match = !bacmp(&c->src, src); |
1413 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1414 | if (src_match && dst_match) { |
23691d75 GP |
1415 | read_unlock(&chan_list_lock); |
1416 | return c; | |
1417 | } | |
b62f328b VT |
1418 | |
1419 | /* Closest match */ | |
7eafc59e MH |
1420 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1421 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1422 | if ((src_match && dst_any) || (src_any && dst_match) || |
1423 | (src_any && dst_any)) | |
23691d75 | 1424 | c1 = c; |
b62f328b VT |
1425 | } |
1426 | } | |
280f294f | 1427 | |
23691d75 | 1428 | read_unlock(&chan_list_lock); |
b62f328b | 1429 | |
23691d75 | 1430 | return c1; |
b62f328b VT |
1431 | } |
1432 | ||
1433 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1434 | { | |
cc8dba2b | 1435 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 1436 | struct l2cap_chan *chan, *pchan; |
cc8dba2b | 1437 | u8 dst_type; |
b62f328b VT |
1438 | |
1439 | BT_DBG(""); | |
1440 | ||
18722c24 JR |
1441 | bt_6lowpan_add_conn(conn); |
1442 | ||
b62f328b | 1443 | /* Check if we have socket listening on cid */ |
073d1cf3 | 1444 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT, |
cc8dba2b | 1445 | &hcon->src, &hcon->dst); |
23691d75 | 1446 | if (!pchan) |
b62f328b VT |
1447 | return; |
1448 | ||
44f3b0fb JH |
1449 | /* Client ATT sockets should override the server one */ |
1450 | if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT)) | |
1451 | return; | |
1452 | ||
cc8dba2b MH |
1453 | dst_type = bdaddr_type(hcon, hcon->dst_type); |
1454 | ||
1455 | /* If device is blocked, do not create a channel for it */ | |
1456 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type)) | |
1457 | return; | |
1458 | ||
8ffb9290 | 1459 | l2cap_chan_lock(pchan); |
62f3a2cf | 1460 | |
80b98027 | 1461 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 1462 | if (!chan) |
b62f328b VT |
1463 | goto clean; |
1464 | ||
cc8dba2b MH |
1465 | bacpy(&chan->src, &hcon->src); |
1466 | bacpy(&chan->dst, &hcon->dst); | |
1467 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
1468 | chan->dst_type = dst_type; | |
b62f328b | 1469 | |
44f3b0fb | 1470 | __l2cap_chan_add(conn, chan); |
48454079 | 1471 | |
b62f328b | 1472 | clean: |
8ffb9290 | 1473 | l2cap_chan_unlock(pchan); |
b62f328b VT |
1474 | } |
1475 | ||
4e8402a3 MH |
1476 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1477 | { | |
48454079 | 1478 | struct l2cap_chan *chan; |
cc110922 | 1479 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1480 | |
79d554a6 | 1481 | BT_DBG("conn %p", conn); |
4e8402a3 | 1482 | |
d8729922 JH |
1483 | /* For outgoing pairing which doesn't necessarily have an |
1484 | * associated socket (e.g. mgmt_pair_device). | |
1485 | */ | |
cc110922 VCG |
1486 | if (hcon->out && hcon->type == LE_LINK) |
1487 | smp_conn_security(hcon, hcon->pending_sec_level); | |
160dc6ac | 1488 | |
3df91ea2 | 1489 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1490 | |
44f3b0fb JH |
1491 | if (hcon->type == LE_LINK) |
1492 | l2cap_le_conn_ready(conn); | |
1493 | ||
3df91ea2 | 1494 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1495 | |
6be36555 | 1496 | l2cap_chan_lock(chan); |
4e8402a3 | 1497 | |
2338a7e0 | 1498 | if (chan->scid == L2CAP_CID_A2MP) { |
416fa752 AE |
1499 | l2cap_chan_unlock(chan); |
1500 | continue; | |
1501 | } | |
1502 | ||
cc110922 | 1503 | if (hcon->type == LE_LINK) { |
f1496dee | 1504 | l2cap_le_start(chan); |
63128451 | 1505 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
74e75740 | 1506 | l2cap_chan_ready(chan); |
b501d6a1 | 1507 | |
1c244f79 | 1508 | } else if (chan->state == BT_CONNECT) { |
fc7f8a7e | 1509 | l2cap_do_start(chan); |
1c244f79 | 1510 | } |
4e8402a3 | 1511 | |
6be36555 | 1512 | l2cap_chan_unlock(chan); |
4e8402a3 | 1513 | } |
79d554a6 | 1514 | |
3df91ea2 | 1515 | mutex_unlock(&conn->chan_lock); |
61a939c6 JH |
1516 | |
1517 | queue_work(hcon->hdev->workqueue, &conn->pending_rx_work); | |
4e8402a3 MH |
1518 | } |
1519 | ||
1520 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1521 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1522 | { | |
48454079 | 1523 | struct l2cap_chan *chan; |
4e8402a3 MH |
1524 | |
1525 | BT_DBG("conn %p", conn); | |
1526 | ||
3df91ea2 | 1527 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1528 | |
3df91ea2 | 1529 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1530 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1531 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1532 | } |
1533 | ||
3df91ea2 | 1534 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1535 | } |
1536 | ||
f878fcad | 1537 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1538 | { |
f878fcad | 1539 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1540 | info_timer.work); |
4e8402a3 | 1541 | |
984947dc | 1542 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1543 | conn->info_ident = 0; |
984947dc | 1544 | |
4e8402a3 MH |
1545 | l2cap_conn_start(conn); |
1546 | } | |
1547 | ||
2c8e1411 DH |
1548 | /* |
1549 | * l2cap_user | |
1550 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1551 | * callback is called during registration. The ->remove callback is called | |
1552 | * during unregistration. | |
1553 | * An l2cap_user object can either be explicitly unregistered or when the | |
1554 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1555 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1556 | * External modules must own a reference to the l2cap_conn object if they intend | |
1557 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1558 | * any time if they don't. | |
1559 | */ | |
1560 | ||
1561 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1562 | { | |
1563 | struct hci_dev *hdev = conn->hcon->hdev; | |
1564 | int ret; | |
1565 | ||
1566 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1567 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1568 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1569 | * relies on the parent hci_conn object to be locked. This itself relies | |
1570 | * on the hci_dev object to be locked. So we must lock the hci device | |
1571 | * here, too. */ | |
1572 | ||
1573 | hci_dev_lock(hdev); | |
1574 | ||
1575 | if (user->list.next || user->list.prev) { | |
1576 | ret = -EINVAL; | |
1577 | goto out_unlock; | |
1578 | } | |
1579 | ||
1580 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1581 | if (!conn->hchan) { | |
1582 | ret = -ENODEV; | |
1583 | goto out_unlock; | |
1584 | } | |
1585 | ||
1586 | ret = user->probe(conn, user); | |
1587 | if (ret) | |
1588 | goto out_unlock; | |
1589 | ||
1590 | list_add(&user->list, &conn->users); | |
1591 | ret = 0; | |
1592 | ||
1593 | out_unlock: | |
1594 | hci_dev_unlock(hdev); | |
1595 | return ret; | |
1596 | } | |
1597 | EXPORT_SYMBOL(l2cap_register_user); | |
1598 | ||
1599 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1600 | { | |
1601 | struct hci_dev *hdev = conn->hcon->hdev; | |
1602 | ||
1603 | hci_dev_lock(hdev); | |
1604 | ||
1605 | if (!user->list.next || !user->list.prev) | |
1606 | goto out_unlock; | |
1607 | ||
1608 | list_del(&user->list); | |
1609 | user->list.next = NULL; | |
1610 | user->list.prev = NULL; | |
1611 | user->remove(conn, user); | |
1612 | ||
1613 | out_unlock: | |
1614 | hci_dev_unlock(hdev); | |
1615 | } | |
1616 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1617 | ||
1618 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1619 | { | |
1620 | struct l2cap_user *user; | |
1621 | ||
1622 | while (!list_empty(&conn->users)) { | |
1623 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1624 | list_del(&user->list); | |
1625 | user->list.next = NULL; | |
1626 | user->list.prev = NULL; | |
1627 | user->remove(conn, user); | |
1628 | } | |
1629 | } | |
1630 | ||
5d3de7df VCG |
1631 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1632 | { | |
1633 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1634 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1635 | |
1636 | if (!conn) | |
1637 | return; | |
1638 | ||
1639 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1640 | ||
1641 | kfree_skb(conn->rx_skb); | |
1642 | ||
61a939c6 JH |
1643 | skb_queue_purge(&conn->pending_rx); |
1644 | flush_work(&conn->pending_rx_work); | |
1645 | ||
2c8e1411 DH |
1646 | l2cap_unregister_all_users(conn); |
1647 | ||
3df91ea2 AE |
1648 | mutex_lock(&conn->chan_lock); |
1649 | ||
5d3de7df VCG |
1650 | /* Kill channels */ |
1651 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1652 | l2cap_chan_hold(chan); |
6be36555 AE |
1653 | l2cap_chan_lock(chan); |
1654 | ||
5d3de7df | 1655 | l2cap_chan_del(chan, err); |
6be36555 AE |
1656 | |
1657 | l2cap_chan_unlock(chan); | |
1658 | ||
80b98027 | 1659 | chan->ops->close(chan); |
61d6ef3e | 1660 | l2cap_chan_put(chan); |
5d3de7df VCG |
1661 | } |
1662 | ||
3df91ea2 AE |
1663 | mutex_unlock(&conn->chan_lock); |
1664 | ||
73d80deb LAD |
1665 | hci_chan_del(conn->hchan); |
1666 | ||
5d3de7df | 1667 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1668 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1669 | |
51a8efd7 | 1670 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1671 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1672 | smp_chan_destroy(conn); |
d26a2345 | 1673 | } |
5d3de7df VCG |
1674 | |
1675 | hcon->l2cap_data = NULL; | |
9c903e37 DH |
1676 | conn->hchan = NULL; |
1677 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1678 | } |
1679 | ||
6c9d42a1 | 1680 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1681 | { |
6c9d42a1 | 1682 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1683 | security_timer.work); |
5d3de7df | 1684 | |
d06cc416 JH |
1685 | BT_DBG("conn %p", conn); |
1686 | ||
1687 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { | |
1688 | smp_chan_destroy(conn); | |
1689 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1690 | } | |
5d3de7df VCG |
1691 | } |
1692 | ||
9c903e37 DH |
1693 | static void l2cap_conn_free(struct kref *ref) |
1694 | { | |
1695 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1696 | ||
1697 | hci_conn_put(conn->hcon); | |
1698 | kfree(conn); | |
1699 | } | |
1700 | ||
1701 | void l2cap_conn_get(struct l2cap_conn *conn) | |
1702 | { | |
1703 | kref_get(&conn->ref); | |
1704 | } | |
1705 | EXPORT_SYMBOL(l2cap_conn_get); | |
1706 | ||
1707 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1708 | { | |
1709 | kref_put(&conn->ref, l2cap_conn_free); | |
1710 | } | |
1711 | EXPORT_SYMBOL(l2cap_conn_put); | |
1712 | ||
1da177e4 | 1713 | /* ---- Socket interface ---- */ |
1da177e4 | 1714 | |
c2287681 | 1715 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1716 | * Returns closest match. |
1717 | */ | |
c2287681 IY |
1718 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1719 | bdaddr_t *src, | |
bf20fd4e JH |
1720 | bdaddr_t *dst, |
1721 | u8 link_type) | |
1da177e4 | 1722 | { |
23691d75 | 1723 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1724 | |
23691d75 | 1725 | read_lock(&chan_list_lock); |
e0f0cb56 | 1726 | |
23691d75 | 1727 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1728 | if (state && c->state != state) |
1da177e4 LT |
1729 | continue; |
1730 | ||
bf20fd4e JH |
1731 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1732 | continue; | |
1733 | ||
1734 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
1735 | continue; | |
1736 | ||
23691d75 | 1737 | if (c->psm == psm) { |
c2287681 IY |
1738 | int src_match, dst_match; |
1739 | int src_any, dst_any; | |
1740 | ||
1da177e4 | 1741 | /* Exact match. */ |
7eafc59e MH |
1742 | src_match = !bacmp(&c->src, src); |
1743 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1744 | if (src_match && dst_match) { |
a7567b20 | 1745 | read_unlock(&chan_list_lock); |
23691d75 GP |
1746 | return c; |
1747 | } | |
1da177e4 LT |
1748 | |
1749 | /* Closest match */ | |
7eafc59e MH |
1750 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1751 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1752 | if ((src_match && dst_any) || (src_any && dst_match) || |
1753 | (src_any && dst_any)) | |
23691d75 | 1754 | c1 = c; |
1da177e4 LT |
1755 | } |
1756 | } | |
1da177e4 | 1757 | |
23691d75 | 1758 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1759 | |
23691d75 | 1760 | return c1; |
1da177e4 LT |
1761 | } |
1762 | ||
721c4181 | 1763 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1764 | { |
721c4181 | 1765 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1766 | monitor_timer.work); |
e90bac06 | 1767 | |
525cd185 | 1768 | BT_DBG("chan %p", chan); |
0e98958d | 1769 | |
6be36555 AE |
1770 | l2cap_chan_lock(chan); |
1771 | ||
80909e04 | 1772 | if (!chan->conn) { |
6be36555 | 1773 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1774 | l2cap_chan_put(chan); |
e90bac06 GP |
1775 | return; |
1776 | } | |
1777 | ||
401bb1f7 | 1778 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1779 | |
6be36555 | 1780 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1781 | l2cap_chan_put(chan); |
e90bac06 GP |
1782 | } |
1783 | ||
721c4181 | 1784 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1785 | { |
721c4181 | 1786 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1787 | retrans_timer.work); |
e90bac06 | 1788 | |
49208c9c | 1789 | BT_DBG("chan %p", chan); |
0e98958d | 1790 | |
6be36555 AE |
1791 | l2cap_chan_lock(chan); |
1792 | ||
80909e04 MM |
1793 | if (!chan->conn) { |
1794 | l2cap_chan_unlock(chan); | |
1795 | l2cap_chan_put(chan); | |
1796 | return; | |
1797 | } | |
6be36555 | 1798 | |
401bb1f7 | 1799 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1800 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1801 | l2cap_chan_put(chan); |
e90bac06 GP |
1802 | } |
1803 | ||
d660366d GP |
1804 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1805 | struct sk_buff_head *skbs) | |
6840ed07 | 1806 | { |
ccbb84af | 1807 | struct sk_buff *skb; |
3733937d | 1808 | struct l2cap_ctrl *control; |
6840ed07 | 1809 | |
3733937d MM |
1810 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1811 | ||
b99e13ad MM |
1812 | if (__chan_is_moving(chan)) |
1813 | return; | |
1814 | ||
3733937d MM |
1815 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1816 | ||
1817 | while (!skb_queue_empty(&chan->tx_q)) { | |
1818 | ||
1819 | skb = skb_dequeue(&chan->tx_q); | |
1820 | ||
1821 | bt_cb(skb)->control.retries = 1; | |
1822 | control = &bt_cb(skb)->control; | |
1823 | ||
1824 | control->reqseq = 0; | |
1825 | control->txseq = chan->next_tx_seq; | |
1826 | ||
1827 | __pack_control(chan, control, skb); | |
6840ed07 | 1828 | |
47d1ec61 | 1829 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1830 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1831 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1832 | } |
1833 | ||
4343478f | 1834 | l2cap_do_send(chan, skb); |
6840ed07 | 1835 | |
b4400672 | 1836 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1837 | |
836be934 | 1838 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1839 | chan->frames_sent++; |
6840ed07 | 1840 | } |
6840ed07 GP |
1841 | } |
1842 | ||
67c9e840 | 1843 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1844 | { |
1845 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1846 | struct l2cap_ctrl *control; |
1847 | int sent = 0; | |
1848 | ||
1849 | BT_DBG("chan %p", chan); | |
1c2acffb | 1850 | |
89bc500e | 1851 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1852 | return -ENOTCONN; |
e90bac06 | 1853 | |
94122bbe MM |
1854 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1855 | return 0; | |
1856 | ||
b99e13ad MM |
1857 | if (__chan_is_moving(chan)) |
1858 | return 0; | |
1859 | ||
18a48e76 MM |
1860 | while (chan->tx_send_head && |
1861 | chan->unacked_frames < chan->remote_tx_win && | |
1862 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1863 | |
18a48e76 | 1864 | skb = chan->tx_send_head; |
e90bac06 | 1865 | |
18a48e76 MM |
1866 | bt_cb(skb)->control.retries = 1; |
1867 | control = &bt_cb(skb)->control; | |
95ffa978 | 1868 | |
e2ab4353 | 1869 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1870 | control->final = 1; |
e2ab4353 | 1871 | |
18a48e76 MM |
1872 | control->reqseq = chan->buffer_seq; |
1873 | chan->last_acked_seq = chan->buffer_seq; | |
1874 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1875 | |
18a48e76 | 1876 | __pack_control(chan, control, skb); |
e90bac06 | 1877 | |
47d1ec61 | 1878 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1879 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1880 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1881 | } |
1882 | ||
18a48e76 MM |
1883 | /* Clone after data has been modified. Data is assumed to be |
1884 | read-only (for locking purposes) on cloned sk_buffs. | |
1885 | */ | |
1886 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1887 | |
18a48e76 MM |
1888 | if (!tx_skb) |
1889 | break; | |
1c2acffb | 1890 | |
18a48e76 | 1891 | __set_retrans_timer(chan); |
836be934 AE |
1892 | |
1893 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1894 | chan->unacked_frames++; |
6a026610 | 1895 | chan->frames_sent++; |
18a48e76 | 1896 | sent++; |
1c2acffb | 1897 | |
58d35f87 GP |
1898 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1899 | chan->tx_send_head = NULL; | |
1c2acffb | 1900 | else |
58d35f87 | 1901 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1902 | |
1903 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1904 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1905 | } |
1906 | ||
b4400672 AE |
1907 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1908 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1909 | |
1910 | return sent; | |
9e917af1 GP |
1911 | } |
1912 | ||
e1fbd4c1 MM |
1913 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1914 | { | |
1915 | struct l2cap_ctrl control; | |
1916 | struct sk_buff *skb; | |
1917 | struct sk_buff *tx_skb; | |
1918 | u16 seq; | |
1919 | ||
1920 | BT_DBG("chan %p", chan); | |
1921 | ||
1922 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1923 | return; | |
1924 | ||
b99e13ad MM |
1925 | if (__chan_is_moving(chan)) |
1926 | return; | |
1927 | ||
e1fbd4c1 MM |
1928 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
1929 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1930 | ||
1931 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1932 | if (!skb) { | |
1933 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1934 | seq); |
e1fbd4c1 MM |
1935 | continue; |
1936 | } | |
1937 | ||
1938 | bt_cb(skb)->control.retries++; | |
1939 | control = bt_cb(skb)->control; | |
1940 | ||
1941 | if (chan->max_tx != 0 && | |
1942 | bt_cb(skb)->control.retries > chan->max_tx) { | |
1943 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 1944 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
1945 | l2cap_seq_list_clear(&chan->retrans_list); |
1946 | break; | |
1947 | } | |
1948 | ||
1949 | control.reqseq = chan->buffer_seq; | |
1950 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1951 | control.final = 1; | |
1952 | else | |
1953 | control.final = 0; | |
1954 | ||
1955 | if (skb_cloned(skb)) { | |
1956 | /* Cloned sk_buffs are read-only, so we need a | |
1957 | * writeable copy | |
1958 | */ | |
8bcde1f2 | 1959 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1960 | } else { |
8bcde1f2 | 1961 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1962 | } |
1963 | ||
1964 | if (!tx_skb) { | |
1965 | l2cap_seq_list_clear(&chan->retrans_list); | |
1966 | break; | |
1967 | } | |
1968 | ||
1969 | /* Update skb contents */ | |
1970 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1971 | put_unaligned_le32(__pack_extended_control(&control), | |
1972 | tx_skb->data + L2CAP_HDR_SIZE); | |
1973 | } else { | |
1974 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1975 | tx_skb->data + L2CAP_HDR_SIZE); | |
1976 | } | |
1977 | ||
1978 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
1979 | u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len); | |
1980 | put_unaligned_le16(fcs, skb_put(tx_skb, | |
1981 | L2CAP_FCS_SIZE)); | |
1982 | } | |
1983 | ||
1984 | l2cap_do_send(chan, tx_skb); | |
1985 | ||
1986 | BT_DBG("Resent txseq %d", control.txseq); | |
1987 | ||
1988 | chan->last_acked_seq = chan->buffer_seq; | |
1989 | } | |
1990 | } | |
1991 | ||
f80842a8 MM |
1992 | static void l2cap_retransmit(struct l2cap_chan *chan, |
1993 | struct l2cap_ctrl *control) | |
1994 | { | |
1995 | BT_DBG("chan %p, control %p", chan, control); | |
1996 | ||
1997 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
1998 | l2cap_ertm_resend(chan); | |
1999 | } | |
2000 | ||
d2a7ac5d MM |
2001 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2002 | struct l2cap_ctrl *control) | |
2003 | { | |
e1fbd4c1 MM |
2004 | struct sk_buff *skb; |
2005 | ||
2006 | BT_DBG("chan %p, control %p", chan, control); | |
2007 | ||
2008 | if (control->poll) | |
2009 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2010 | ||
2011 | l2cap_seq_list_clear(&chan->retrans_list); | |
2012 | ||
2013 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2014 | return; | |
2015 | ||
2016 | if (chan->unacked_frames) { | |
2017 | skb_queue_walk(&chan->tx_q, skb) { | |
2018 | if (bt_cb(skb)->control.txseq == control->reqseq || | |
2d792818 | 2019 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2020 | break; |
2021 | } | |
2022 | ||
2023 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2024 | if (skb == chan->tx_send_head) | |
2025 | break; | |
2026 | ||
2027 | l2cap_seq_list_append(&chan->retrans_list, | |
2028 | bt_cb(skb)->control.txseq); | |
2029 | } | |
2030 | ||
2031 | l2cap_ertm_resend(chan); | |
2032 | } | |
d2a7ac5d MM |
2033 | } |
2034 | ||
0a0aba42 | 2035 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2036 | { |
0a0aba42 MM |
2037 | struct l2cap_ctrl control; |
2038 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2039 | chan->last_acked_seq); | |
2040 | int threshold; | |
9e917af1 | 2041 | |
0a0aba42 MM |
2042 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2043 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2044 | |
0a0aba42 MM |
2045 | memset(&control, 0, sizeof(control)); |
2046 | control.sframe = 1; | |
dfc909be | 2047 | |
0a0aba42 MM |
2048 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2049 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2050 | __clear_ack_timer(chan); | |
2051 | control.super = L2CAP_SUPER_RNR; | |
2052 | control.reqseq = chan->buffer_seq; | |
2053 | l2cap_send_sframe(chan, &control); | |
2054 | } else { | |
2055 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2056 | l2cap_ertm_send(chan); | |
2057 | /* If any i-frames were sent, they included an ack */ | |
2058 | if (chan->buffer_seq == chan->last_acked_seq) | |
2059 | frames_to_ack = 0; | |
2060 | } | |
dfc909be | 2061 | |
c20f8e35 | 2062 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2063 | * Calculate without mul or div |
2064 | */ | |
c20f8e35 | 2065 | threshold = chan->ack_win; |
0a0aba42 MM |
2066 | threshold += threshold << 1; |
2067 | threshold >>= 2; | |
2068 | ||
b4400672 | 2069 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2070 | threshold); |
2071 | ||
2072 | if (frames_to_ack >= threshold) { | |
2073 | __clear_ack_timer(chan); | |
2074 | control.super = L2CAP_SUPER_RR; | |
2075 | control.reqseq = chan->buffer_seq; | |
2076 | l2cap_send_sframe(chan, &control); | |
2077 | frames_to_ack = 0; | |
2078 | } | |
1c2acffb | 2079 | |
0a0aba42 MM |
2080 | if (frames_to_ack) |
2081 | __set_ack_timer(chan); | |
2082 | } | |
b17e73bb SJ |
2083 | } |
2084 | ||
04124681 GP |
2085 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2086 | struct msghdr *msg, int len, | |
2087 | int count, struct sk_buff *skb) | |
1c2acffb | 2088 | { |
0952a57a | 2089 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2090 | struct sk_buff **frag; |
90338947 | 2091 | int sent = 0; |
1da177e4 | 2092 | |
59203a21 | 2093 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 2094 | return -EFAULT; |
1da177e4 LT |
2095 | |
2096 | sent += count; | |
2097 | len -= count; | |
2098 | ||
2099 | /* Continuation fragments (no L2CAP header) */ | |
2100 | frag = &skb_shinfo(skb)->frag_list; | |
2101 | while (len) { | |
fbe00700 GP |
2102 | struct sk_buff *tmp; |
2103 | ||
1da177e4 LT |
2104 | count = min_t(unsigned int, conn->mtu, len); |
2105 | ||
fbe00700 GP |
2106 | tmp = chan->ops->alloc_skb(chan, count, |
2107 | msg->msg_flags & MSG_DONTWAIT); | |
2108 | if (IS_ERR(tmp)) | |
2109 | return PTR_ERR(tmp); | |
2110 | ||
2111 | *frag = tmp; | |
2f7719ce | 2112 | |
1c2acffb GP |
2113 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
2114 | return -EFAULT; | |
1da177e4 | 2115 | |
5e59b791 LAD |
2116 | (*frag)->priority = skb->priority; |
2117 | ||
1da177e4 LT |
2118 | sent += count; |
2119 | len -= count; | |
2120 | ||
2d0ed3d5 GP |
2121 | skb->len += (*frag)->len; |
2122 | skb->data_len += (*frag)->len; | |
2123 | ||
1da177e4 LT |
2124 | frag = &(*frag)->next; |
2125 | } | |
1da177e4 LT |
2126 | |
2127 | return sent; | |
1c2acffb | 2128 | } |
1da177e4 | 2129 | |
5e59b791 | 2130 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2131 | struct msghdr *msg, size_t len, |
2132 | u32 priority) | |
1c2acffb | 2133 | { |
8c1d787b | 2134 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2135 | struct sk_buff *skb; |
03a51213 | 2136 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2137 | struct l2cap_hdr *lh; |
2138 | ||
43b1b8df MH |
2139 | BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan, |
2140 | __le16_to_cpu(chan->psm), len, priority); | |
1c2acffb GP |
2141 | |
2142 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
2143 | |
2144 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2145 | msg->msg_flags & MSG_DONTWAIT); |
2146 | if (IS_ERR(skb)) | |
2147 | return skb; | |
1c2acffb | 2148 | |
5e59b791 LAD |
2149 | skb->priority = priority; |
2150 | ||
1c2acffb GP |
2151 | /* Create L2CAP header */ |
2152 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2153 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2154 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2155 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2156 | |
0952a57a | 2157 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2158 | if (unlikely(err < 0)) { |
2159 | kfree_skb(skb); | |
2160 | return ERR_PTR(err); | |
2161 | } | |
2162 | return skb; | |
2163 | } | |
2164 | ||
5e59b791 | 2165 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2166 | struct msghdr *msg, size_t len, |
2167 | u32 priority) | |
1c2acffb | 2168 | { |
8c1d787b | 2169 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2170 | struct sk_buff *skb; |
f2ba7fae | 2171 | int err, count; |
1c2acffb GP |
2172 | struct l2cap_hdr *lh; |
2173 | ||
b4400672 | 2174 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2175 | |
f2ba7fae | 2176 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2177 | |
f2ba7fae | 2178 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
2179 | msg->msg_flags & MSG_DONTWAIT); |
2180 | if (IS_ERR(skb)) | |
2181 | return skb; | |
1c2acffb | 2182 | |
5e59b791 LAD |
2183 | skb->priority = priority; |
2184 | ||
1c2acffb GP |
2185 | /* Create L2CAP header */ |
2186 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2187 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2188 | lh->len = cpu_to_le16(len); |
1c2acffb | 2189 | |
0952a57a | 2190 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2191 | if (unlikely(err < 0)) { |
2192 | kfree_skb(skb); | |
2193 | return ERR_PTR(err); | |
2194 | } | |
2195 | return skb; | |
2196 | } | |
2197 | ||
ab0ff76d | 2198 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2199 | struct msghdr *msg, size_t len, |
2200 | u16 sdulen) | |
1c2acffb | 2201 | { |
8c1d787b | 2202 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2203 | struct sk_buff *skb; |
e4ca6d98 | 2204 | int err, count, hlen; |
1c2acffb GP |
2205 | struct l2cap_hdr *lh; |
2206 | ||
b4400672 | 2207 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2208 | |
0ee0d208 GP |
2209 | if (!conn) |
2210 | return ERR_PTR(-ENOTCONN); | |
2211 | ||
ba7aa64f | 2212 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2213 | |
c74e560c | 2214 | if (sdulen) |
03a51213 | 2215 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2216 | |
47d1ec61 | 2217 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2218 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2219 | |
1c2acffb | 2220 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
2221 | |
2222 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
2223 | msg->msg_flags & MSG_DONTWAIT); |
2224 | if (IS_ERR(skb)) | |
2225 | return skb; | |
1c2acffb GP |
2226 | |
2227 | /* Create L2CAP header */ | |
2228 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2229 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2230 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2231 | |
18a48e76 MM |
2232 | /* Control header is populated later */ |
2233 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2234 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2235 | else | |
2236 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2237 | |
c74e560c | 2238 | if (sdulen) |
03a51213 | 2239 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2240 | |
0952a57a | 2241 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2242 | if (unlikely(err < 0)) { |
2243 | kfree_skb(skb); | |
2244 | return ERR_PTR(err); | |
2245 | } | |
e90bac06 | 2246 | |
18a48e76 | 2247 | bt_cb(skb)->control.fcs = chan->fcs; |
3ce3514f | 2248 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 2249 | return skb; |
1da177e4 LT |
2250 | } |
2251 | ||
94122bbe MM |
2252 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2253 | struct sk_buff_head *seg_queue, | |
2254 | struct msghdr *msg, size_t len) | |
c74e560c | 2255 | { |
c74e560c | 2256 | struct sk_buff *skb; |
94122bbe MM |
2257 | u16 sdu_len; |
2258 | size_t pdu_len; | |
94122bbe | 2259 | u8 sar; |
c74e560c | 2260 | |
b4400672 | 2261 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2262 | |
94122bbe MM |
2263 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2264 | * so fragmented skbs are not used. The HCI layer's handling | |
2265 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2266 | */ | |
c74e560c | 2267 | |
94122bbe MM |
2268 | /* PDU size is derived from the HCI MTU */ |
2269 | pdu_len = chan->conn->mtu; | |
c74e560c | 2270 | |
a549574d MM |
2271 | /* Constrain PDU size for BR/EDR connections */ |
2272 | if (!chan->hs_hcon) | |
2273 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2274 | |
2275 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2276 | if (chan->fcs) |
2277 | pdu_len -= L2CAP_FCS_SIZE; | |
2278 | ||
ba7aa64f | 2279 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2280 | |
2281 | /* Remote device may have requested smaller PDUs */ | |
2282 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2283 | ||
2284 | if (len <= pdu_len) { | |
2285 | sar = L2CAP_SAR_UNSEGMENTED; | |
2286 | sdu_len = 0; | |
2287 | pdu_len = len; | |
2288 | } else { | |
2289 | sar = L2CAP_SAR_START; | |
2290 | sdu_len = len; | |
2291 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2292 | } | |
2293 | ||
2294 | while (len > 0) { | |
2295 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2296 | |
c74e560c | 2297 | if (IS_ERR(skb)) { |
94122bbe | 2298 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2299 | return PTR_ERR(skb); |
2300 | } | |
2301 | ||
94122bbe MM |
2302 | bt_cb(skb)->control.sar = sar; |
2303 | __skb_queue_tail(seg_queue, skb); | |
2304 | ||
2305 | len -= pdu_len; | |
2306 | if (sdu_len) { | |
2307 | sdu_len = 0; | |
2308 | pdu_len += L2CAP_SDULEN_SIZE; | |
2309 | } | |
2310 | ||
2311 | if (len <= pdu_len) { | |
2312 | sar = L2CAP_SAR_END; | |
2313 | pdu_len = len; | |
2314 | } else { | |
2315 | sar = L2CAP_SAR_CONTINUE; | |
2316 | } | |
c74e560c | 2317 | } |
c74e560c | 2318 | |
f0f62799 | 2319 | return 0; |
c74e560c GP |
2320 | } |
2321 | ||
177f8f2b JH |
2322 | static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, |
2323 | struct msghdr *msg, | |
2324 | size_t len, u16 sdulen) | |
2325 | { | |
2326 | struct l2cap_conn *conn = chan->conn; | |
2327 | struct sk_buff *skb; | |
2328 | int err, count, hlen; | |
2329 | struct l2cap_hdr *lh; | |
2330 | ||
2331 | BT_DBG("chan %p len %zu", chan, len); | |
2332 | ||
2333 | if (!conn) | |
2334 | return ERR_PTR(-ENOTCONN); | |
2335 | ||
2336 | hlen = L2CAP_HDR_SIZE; | |
2337 | ||
2338 | if (sdulen) | |
2339 | hlen += L2CAP_SDULEN_SIZE; | |
2340 | ||
2341 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2342 | ||
2343 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
2344 | msg->msg_flags & MSG_DONTWAIT); | |
2345 | if (IS_ERR(skb)) | |
2346 | return skb; | |
2347 | ||
2348 | /* Create L2CAP header */ | |
2349 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
2350 | lh->cid = cpu_to_le16(chan->dcid); | |
2351 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
2352 | ||
2353 | if (sdulen) | |
2354 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); | |
2355 | ||
2356 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); | |
2357 | if (unlikely(err < 0)) { | |
2358 | kfree_skb(skb); | |
2359 | return ERR_PTR(err); | |
2360 | } | |
2361 | ||
2362 | return skb; | |
2363 | } | |
2364 | ||
2365 | static int l2cap_segment_le_sdu(struct l2cap_chan *chan, | |
2366 | struct sk_buff_head *seg_queue, | |
2367 | struct msghdr *msg, size_t len) | |
2368 | { | |
2369 | struct sk_buff *skb; | |
2370 | size_t pdu_len; | |
2371 | u16 sdu_len; | |
2372 | ||
2373 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); | |
2374 | ||
2375 | pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE; | |
2376 | ||
2377 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2378 | ||
2379 | sdu_len = len; | |
2380 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2381 | ||
2382 | while (len > 0) { | |
2383 | if (len <= pdu_len) | |
2384 | pdu_len = len; | |
2385 | ||
2386 | skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); | |
2387 | if (IS_ERR(skb)) { | |
2388 | __skb_queue_purge(seg_queue); | |
2389 | return PTR_ERR(skb); | |
2390 | } | |
2391 | ||
2392 | __skb_queue_tail(seg_queue, skb); | |
2393 | ||
2394 | len -= pdu_len; | |
2395 | ||
2396 | if (sdu_len) { | |
2397 | sdu_len = 0; | |
2398 | pdu_len += L2CAP_SDULEN_SIZE; | |
2399 | } | |
2400 | } | |
2401 | ||
2402 | return 0; | |
2403 | } | |
2404 | ||
5e59b791 | 2405 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2d792818 | 2406 | u32 priority) |
9a91a04a | 2407 | { |
9a91a04a | 2408 | struct sk_buff *skb; |
9a91a04a | 2409 | int err; |
94122bbe | 2410 | struct sk_buff_head seg_queue; |
9a91a04a | 2411 | |
31e8ce80 SWK |
2412 | if (!chan->conn) |
2413 | return -ENOTCONN; | |
2414 | ||
9a91a04a | 2415 | /* Connectionless channel */ |
715ec005 | 2416 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2417 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2418 | if (IS_ERR(skb)) |
2419 | return PTR_ERR(skb); | |
2420 | ||
2421 | l2cap_do_send(chan, skb); | |
2422 | return len; | |
2423 | } | |
2424 | ||
2425 | switch (chan->mode) { | |
38319713 | 2426 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b JH |
2427 | /* Check outgoing MTU */ |
2428 | if (len > chan->omtu) | |
2429 | return -EMSGSIZE; | |
2430 | ||
fad5fc89 JH |
2431 | if (!chan->tx_credits) |
2432 | return -EAGAIN; | |
2433 | ||
177f8f2b JH |
2434 | __skb_queue_head_init(&seg_queue); |
2435 | ||
2436 | err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); | |
2437 | ||
2438 | if (chan->state != BT_CONNECTED) { | |
2439 | __skb_queue_purge(&seg_queue); | |
2440 | err = -ENOTCONN; | |
2441 | } | |
2442 | ||
2443 | if (err) | |
2444 | return err; | |
2445 | ||
2446 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); | |
2447 | ||
2448 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
2449 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
2450 | chan->tx_credits--; | |
2451 | } | |
2452 | ||
2453 | if (!chan->tx_credits) | |
2454 | chan->ops->suspend(chan); | |
2455 | ||
2456 | err = len; | |
2457 | ||
2458 | break; | |
2459 | ||
fad5fc89 | 2460 | case L2CAP_MODE_BASIC: |
9a91a04a GP |
2461 | /* Check outgoing MTU */ |
2462 | if (len > chan->omtu) | |
2463 | return -EMSGSIZE; | |
2464 | ||
2465 | /* Create a basic PDU */ | |
5e59b791 | 2466 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2467 | if (IS_ERR(skb)) |
2468 | return PTR_ERR(skb); | |
2469 | ||
2470 | l2cap_do_send(chan, skb); | |
2471 | err = len; | |
2472 | break; | |
2473 | ||
2474 | case L2CAP_MODE_ERTM: | |
2475 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2476 | /* Check outgoing MTU */ |
2477 | if (len > chan->omtu) { | |
2478 | err = -EMSGSIZE; | |
2479 | break; | |
2480 | } | |
9a91a04a | 2481 | |
94122bbe | 2482 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2483 | |
94122bbe MM |
2484 | /* Do segmentation before calling in to the state machine, |
2485 | * since it's possible to block while waiting for memory | |
2486 | * allocation. | |
2487 | */ | |
2488 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2489 | |
94122bbe MM |
2490 | /* The channel could have been closed while segmenting, |
2491 | * check that it is still connected. | |
2492 | */ | |
2493 | if (chan->state != BT_CONNECTED) { | |
2494 | __skb_queue_purge(&seg_queue); | |
2495 | err = -ENOTCONN; | |
9a91a04a GP |
2496 | } |
2497 | ||
94122bbe | 2498 | if (err) |
9a91a04a | 2499 | break; |
9a91a04a | 2500 | |
3733937d | 2501 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2502 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2503 | else |
d660366d | 2504 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2505 | |
d660366d | 2506 | err = len; |
9a91a04a | 2507 | |
94122bbe MM |
2508 | /* If the skbs were not queued for sending, they'll still be in |
2509 | * seg_queue and need to be purged. | |
2510 | */ | |
2511 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2512 | break; |
2513 | ||
2514 | default: | |
2515 | BT_DBG("bad state %1.1x", chan->mode); | |
2516 | err = -EBADFD; | |
2517 | } | |
2518 | ||
2519 | return err; | |
2520 | } | |
2521 | ||
d2a7ac5d MM |
2522 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2523 | { | |
bed68bde MM |
2524 | struct l2cap_ctrl control; |
2525 | u16 seq; | |
2526 | ||
b4400672 | 2527 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2528 | |
2529 | memset(&control, 0, sizeof(control)); | |
2530 | control.sframe = 1; | |
2531 | control.super = L2CAP_SUPER_SREJ; | |
2532 | ||
2533 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2534 | seq = __next_seq(chan, seq)) { | |
2535 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2536 | control.reqseq = seq; | |
2537 | l2cap_send_sframe(chan, &control); | |
2538 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2539 | } | |
2540 | } | |
2541 | ||
2542 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2543 | } |
2544 | ||
2545 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2546 | { | |
bed68bde MM |
2547 | struct l2cap_ctrl control; |
2548 | ||
2549 | BT_DBG("chan %p", chan); | |
2550 | ||
2551 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2552 | return; | |
2553 | ||
2554 | memset(&control, 0, sizeof(control)); | |
2555 | control.sframe = 1; | |
2556 | control.super = L2CAP_SUPER_SREJ; | |
2557 | control.reqseq = chan->srej_list.tail; | |
2558 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2559 | } |
2560 | ||
2561 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2562 | { | |
bed68bde MM |
2563 | struct l2cap_ctrl control; |
2564 | u16 initial_head; | |
2565 | u16 seq; | |
2566 | ||
b4400672 | 2567 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2568 | |
2569 | memset(&control, 0, sizeof(control)); | |
2570 | control.sframe = 1; | |
2571 | control.super = L2CAP_SUPER_SREJ; | |
2572 | ||
2573 | /* Capture initial list head to allow only one pass through the list. */ | |
2574 | initial_head = chan->srej_list.head; | |
2575 | ||
2576 | do { | |
2577 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2578 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2579 | break; | |
2580 | ||
2581 | control.reqseq = seq; | |
2582 | l2cap_send_sframe(chan, &control); | |
2583 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2584 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2585 | } |
2586 | ||
608bcc6d MM |
2587 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2588 | { | |
2589 | struct sk_buff *acked_skb; | |
2590 | u16 ackseq; | |
2591 | ||
b4400672 | 2592 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2593 | |
2594 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2595 | return; | |
2596 | ||
b4400672 | 2597 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2598 | chan->expected_ack_seq, chan->unacked_frames); |
2599 | ||
2600 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2601 | ackseq = __next_seq(chan, ackseq)) { | |
2602 | ||
2603 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2604 | if (acked_skb) { | |
2605 | skb_unlink(acked_skb, &chan->tx_q); | |
2606 | kfree_skb(acked_skb); | |
2607 | chan->unacked_frames--; | |
2608 | } | |
2609 | } | |
2610 | ||
2611 | chan->expected_ack_seq = reqseq; | |
2612 | ||
2613 | if (chan->unacked_frames == 0) | |
2614 | __clear_retrans_timer(chan); | |
2615 | ||
b4400672 | 2616 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2617 | } |
2618 | ||
2619 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2620 | { | |
2621 | BT_DBG("chan %p", chan); | |
2622 | ||
2623 | chan->expected_tx_seq = chan->buffer_seq; | |
2624 | l2cap_seq_list_clear(&chan->srej_list); | |
2625 | skb_queue_purge(&chan->srej_q); | |
2626 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2627 | } | |
2628 | ||
d660366d GP |
2629 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2630 | struct l2cap_ctrl *control, | |
2631 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2632 | { |
608bcc6d MM |
2633 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2634 | event); | |
2635 | ||
2636 | switch (event) { | |
2637 | case L2CAP_EV_DATA_REQUEST: | |
2638 | if (chan->tx_send_head == NULL) | |
2639 | chan->tx_send_head = skb_peek(skbs); | |
2640 | ||
2641 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2642 | l2cap_ertm_send(chan); | |
2643 | break; | |
2644 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2645 | BT_DBG("Enter LOCAL_BUSY"); | |
2646 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2647 | ||
2648 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2649 | /* The SREJ_SENT state must be aborted if we are to | |
2650 | * enter the LOCAL_BUSY state. | |
2651 | */ | |
2652 | l2cap_abort_rx_srej_sent(chan); | |
2653 | } | |
2654 | ||
2655 | l2cap_send_ack(chan); | |
2656 | ||
2657 | break; | |
2658 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2659 | BT_DBG("Exit LOCAL_BUSY"); | |
2660 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2661 | ||
2662 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2663 | struct l2cap_ctrl local_control; | |
2664 | ||
2665 | memset(&local_control, 0, sizeof(local_control)); | |
2666 | local_control.sframe = 1; | |
2667 | local_control.super = L2CAP_SUPER_RR; | |
2668 | local_control.poll = 1; | |
2669 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2670 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2671 | |
2672 | chan->retry_count = 1; | |
2673 | __set_monitor_timer(chan); | |
2674 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2675 | } | |
2676 | break; | |
2677 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2678 | l2cap_process_reqseq(chan, control->reqseq); | |
2679 | break; | |
2680 | case L2CAP_EV_EXPLICIT_POLL: | |
2681 | l2cap_send_rr_or_rnr(chan, 1); | |
2682 | chan->retry_count = 1; | |
2683 | __set_monitor_timer(chan); | |
2684 | __clear_ack_timer(chan); | |
2685 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2686 | break; | |
2687 | case L2CAP_EV_RETRANS_TO: | |
2688 | l2cap_send_rr_or_rnr(chan, 1); | |
2689 | chan->retry_count = 1; | |
2690 | __set_monitor_timer(chan); | |
2691 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2692 | break; | |
2693 | case L2CAP_EV_RECV_FBIT: | |
2694 | /* Nothing to process */ | |
2695 | break; | |
2696 | default: | |
2697 | break; | |
2698 | } | |
608bcc6d MM |
2699 | } |
2700 | ||
d660366d GP |
2701 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2702 | struct l2cap_ctrl *control, | |
2703 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2704 | { |
608bcc6d MM |
2705 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2706 | event); | |
2707 | ||
2708 | switch (event) { | |
2709 | case L2CAP_EV_DATA_REQUEST: | |
2710 | if (chan->tx_send_head == NULL) | |
2711 | chan->tx_send_head = skb_peek(skbs); | |
2712 | /* Queue data, but don't send. */ | |
2713 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2714 | break; | |
2715 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2716 | BT_DBG("Enter LOCAL_BUSY"); | |
2717 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2718 | ||
2719 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2720 | /* The SREJ_SENT state must be aborted if we are to | |
2721 | * enter the LOCAL_BUSY state. | |
2722 | */ | |
2723 | l2cap_abort_rx_srej_sent(chan); | |
2724 | } | |
2725 | ||
2726 | l2cap_send_ack(chan); | |
2727 | ||
2728 | break; | |
2729 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2730 | BT_DBG("Exit LOCAL_BUSY"); | |
2731 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2732 | ||
2733 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2734 | struct l2cap_ctrl local_control; | |
2735 | memset(&local_control, 0, sizeof(local_control)); | |
2736 | local_control.sframe = 1; | |
2737 | local_control.super = L2CAP_SUPER_RR; | |
2738 | local_control.poll = 1; | |
2739 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2740 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2741 | |
2742 | chan->retry_count = 1; | |
2743 | __set_monitor_timer(chan); | |
2744 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2745 | } | |
2746 | break; | |
2747 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2748 | l2cap_process_reqseq(chan, control->reqseq); | |
2749 | ||
2750 | /* Fall through */ | |
2751 | ||
2752 | case L2CAP_EV_RECV_FBIT: | |
2753 | if (control && control->final) { | |
2754 | __clear_monitor_timer(chan); | |
2755 | if (chan->unacked_frames > 0) | |
2756 | __set_retrans_timer(chan); | |
2757 | chan->retry_count = 0; | |
2758 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2759 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2760 | } | |
2761 | break; | |
2762 | case L2CAP_EV_EXPLICIT_POLL: | |
2763 | /* Ignore */ | |
2764 | break; | |
2765 | case L2CAP_EV_MONITOR_TO: | |
2766 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2767 | l2cap_send_rr_or_rnr(chan, 1); | |
2768 | __set_monitor_timer(chan); | |
2769 | chan->retry_count++; | |
2770 | } else { | |
5e4e3972 | 2771 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2772 | } |
2773 | break; | |
2774 | default: | |
2775 | break; | |
2776 | } | |
608bcc6d MM |
2777 | } |
2778 | ||
d660366d GP |
2779 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2780 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2781 | { |
608bcc6d MM |
2782 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2783 | chan, control, skbs, event, chan->tx_state); | |
2784 | ||
2785 | switch (chan->tx_state) { | |
2786 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2787 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2788 | break; |
2789 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2790 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2791 | break; |
2792 | default: | |
2793 | /* Ignore event */ | |
2794 | break; | |
2795 | } | |
608bcc6d MM |
2796 | } |
2797 | ||
4b51dae9 MM |
2798 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2799 | struct l2cap_ctrl *control) | |
2800 | { | |
2801 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2802 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2803 | } |
2804 | ||
f80842a8 MM |
2805 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2806 | struct l2cap_ctrl *control) | |
2807 | { | |
2808 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2809 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2810 | } |
2811 | ||
1da177e4 LT |
2812 | /* Copy frame to all raw sockets on that connection */ |
2813 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2814 | { | |
1da177e4 | 2815 | struct sk_buff *nskb; |
48454079 | 2816 | struct l2cap_chan *chan; |
1da177e4 LT |
2817 | |
2818 | BT_DBG("conn %p", conn); | |
2819 | ||
3df91ea2 | 2820 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2821 | |
3df91ea2 | 2822 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2823 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2824 | continue; |
2825 | ||
7f5396a7 GP |
2826 | /* Don't send frame to the channel it came from */ |
2827 | if (bt_cb(skb)->chan == chan) | |
1da177e4 | 2828 | continue; |
7f5396a7 | 2829 | |
8bcde1f2 | 2830 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2831 | if (!nskb) |
1da177e4 | 2832 | continue; |
80b98027 | 2833 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2834 | kfree_skb(nskb); |
2835 | } | |
3d57dc68 | 2836 | |
3df91ea2 | 2837 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2838 | } |
2839 | ||
2840 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2841 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2842 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2843 | { |
2844 | struct sk_buff *skb, **frag; | |
2845 | struct l2cap_cmd_hdr *cmd; | |
2846 | struct l2cap_hdr *lh; | |
2847 | int len, count; | |
2848 | ||
b4400672 AE |
2849 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2850 | conn, code, ident, dlen); | |
1da177e4 | 2851 | |
300b962e AL |
2852 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2853 | return NULL; | |
2854 | ||
1da177e4 LT |
2855 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2856 | count = min_t(unsigned int, conn->mtu, len); | |
2857 | ||
8bcde1f2 | 2858 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2859 | if (!skb) |
2860 | return NULL; | |
2861 | ||
2862 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2863 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2864 | |
2865 | if (conn->hcon->type == LE_LINK) | |
ac73498c | 2866 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2867 | else |
ac73498c | 2868 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2869 | |
2870 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2871 | cmd->code = code; | |
2872 | cmd->ident = ident; | |
aca3192c | 2873 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2874 | |
2875 | if (dlen) { | |
2876 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2877 | memcpy(skb_put(skb, count), data, count); | |
2878 | data += count; | |
2879 | } | |
2880 | ||
2881 | len -= skb->len; | |
2882 | ||
2883 | /* Continuation fragments (no L2CAP header) */ | |
2884 | frag = &skb_shinfo(skb)->frag_list; | |
2885 | while (len) { | |
2886 | count = min_t(unsigned int, conn->mtu, len); | |
2887 | ||
8bcde1f2 | 2888 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2889 | if (!*frag) |
2890 | goto fail; | |
2891 | ||
2892 | memcpy(skb_put(*frag, count), data, count); | |
2893 | ||
2894 | len -= count; | |
2895 | data += count; | |
2896 | ||
2897 | frag = &(*frag)->next; | |
2898 | } | |
2899 | ||
2900 | return skb; | |
2901 | ||
2902 | fail: | |
2903 | kfree_skb(skb); | |
2904 | return NULL; | |
2905 | } | |
2906 | ||
2d792818 GP |
2907 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2908 | unsigned long *val) | |
1da177e4 LT |
2909 | { |
2910 | struct l2cap_conf_opt *opt = *ptr; | |
2911 | int len; | |
2912 | ||
2913 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2914 | *ptr += len; | |
2915 | ||
2916 | *type = opt->type; | |
2917 | *olen = opt->len; | |
2918 | ||
2919 | switch (opt->len) { | |
2920 | case 1: | |
2921 | *val = *((u8 *) opt->val); | |
2922 | break; | |
2923 | ||
2924 | case 2: | |
bfaaeb3e | 2925 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2926 | break; |
2927 | ||
2928 | case 4: | |
bfaaeb3e | 2929 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2930 | break; |
2931 | ||
2932 | default: | |
2933 | *val = (unsigned long) opt->val; | |
2934 | break; | |
2935 | } | |
2936 | ||
b4400672 | 2937 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2938 | return len; |
2939 | } | |
2940 | ||
1da177e4 LT |
2941 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2942 | { | |
2943 | struct l2cap_conf_opt *opt = *ptr; | |
2944 | ||
b4400672 | 2945 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2946 | |
2947 | opt->type = type; | |
2948 | opt->len = len; | |
2949 | ||
2950 | switch (len) { | |
2951 | case 1: | |
2952 | *((u8 *) opt->val) = val; | |
2953 | break; | |
2954 | ||
2955 | case 2: | |
4f8b691c | 2956 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2957 | break; |
2958 | ||
2959 | case 4: | |
4f8b691c | 2960 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2961 | break; |
2962 | ||
2963 | default: | |
2964 | memcpy(opt->val, (void *) val, len); | |
2965 | break; | |
2966 | } | |
2967 | ||
2968 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2969 | } | |
2970 | ||
f89cef09 AE |
2971 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2972 | { | |
2973 | struct l2cap_conf_efs efs; | |
2974 | ||
1ec918ce | 2975 | switch (chan->mode) { |
f89cef09 AE |
2976 | case L2CAP_MODE_ERTM: |
2977 | efs.id = chan->local_id; | |
2978 | efs.stype = chan->local_stype; | |
2979 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2980 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
ac73498c | 2981 | efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
8936fa6d | 2982 | efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
f89cef09 AE |
2983 | break; |
2984 | ||
2985 | case L2CAP_MODE_STREAMING: | |
2986 | efs.id = 1; | |
2987 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2988 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2989 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2990 | efs.acc_lat = 0; | |
2991 | efs.flush_to = 0; | |
2992 | break; | |
2993 | ||
2994 | default: | |
2995 | return; | |
2996 | } | |
2997 | ||
2998 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 2999 | (unsigned long) &efs); |
f89cef09 AE |
3000 | } |
3001 | ||
721c4181 | 3002 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3003 | { |
721c4181 | 3004 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3005 | ack_timer.work); |
3006 | u16 frames_to_ack; | |
c1b4f43b | 3007 | |
2fb9b3d4 GP |
3008 | BT_DBG("chan %p", chan); |
3009 | ||
6be36555 AE |
3010 | l2cap_chan_lock(chan); |
3011 | ||
0362520b MM |
3012 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3013 | chan->last_acked_seq); | |
6be36555 | 3014 | |
0362520b MM |
3015 | if (frames_to_ack) |
3016 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3017 | |
0362520b | 3018 | l2cap_chan_unlock(chan); |
09bfb2ee | 3019 | l2cap_chan_put(chan); |
c1b4f43b GP |
3020 | } |
3021 | ||
466f8004 | 3022 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3023 | { |
3c588192 MM |
3024 | int err; |
3025 | ||
105bdf9e MM |
3026 | chan->next_tx_seq = 0; |
3027 | chan->expected_tx_seq = 0; | |
42e5c802 | 3028 | chan->expected_ack_seq = 0; |
6a026610 | 3029 | chan->unacked_frames = 0; |
42e5c802 | 3030 | chan->buffer_seq = 0; |
6a026610 | 3031 | chan->frames_sent = 0; |
105bdf9e MM |
3032 | chan->last_acked_seq = 0; |
3033 | chan->sdu = NULL; | |
3034 | chan->sdu_last_frag = NULL; | |
3035 | chan->sdu_len = 0; | |
3036 | ||
d34c34fb MM |
3037 | skb_queue_head_init(&chan->tx_q); |
3038 | ||
6ed971ca MH |
3039 | chan->local_amp_id = AMP_ID_BREDR; |
3040 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3041 | chan->move_state = L2CAP_MOVE_STABLE; |
3042 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3043 | ||
105bdf9e MM |
3044 | if (chan->mode != L2CAP_MODE_ERTM) |
3045 | return 0; | |
3046 | ||
3047 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3048 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3049 | |
721c4181 GP |
3050 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3051 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3052 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3053 | |
f1c6775b | 3054 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3055 | |
3c588192 MM |
3056 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3057 | if (err < 0) | |
3058 | return err; | |
3059 | ||
9dc9affc MM |
3060 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3061 | if (err < 0) | |
3062 | l2cap_seq_list_free(&chan->srej_list); | |
3063 | ||
3064 | return err; | |
0565c1c2 GP |
3065 | } |
3066 | ||
f2fcfcd6 GP |
3067 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3068 | { | |
3069 | switch (mode) { | |
3070 | case L2CAP_MODE_STREAMING: | |
3071 | case L2CAP_MODE_ERTM: | |
3072 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3073 | return mode; | |
3074 | /* fall through */ | |
3075 | default: | |
3076 | return L2CAP_MODE_BASIC; | |
3077 | } | |
3078 | } | |
3079 | ||
848566b3 | 3080 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3081 | { |
848566b3 | 3082 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; |
6327eb98 AE |
3083 | } |
3084 | ||
848566b3 | 3085 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3086 | { |
848566b3 | 3087 | return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW; |
f89cef09 AE |
3088 | } |
3089 | ||
36c86c85 MM |
3090 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3091 | struct l2cap_conf_rfc *rfc) | |
3092 | { | |
6ed971ca | 3093 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3094 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3095 | ||
3096 | /* Class 1 devices have must have ERTM timeouts | |
3097 | * exceeding the Link Supervision Timeout. The | |
3098 | * default Link Supervision Timeout for AMP | |
3099 | * controllers is 10 seconds. | |
3100 | * | |
3101 | * Class 1 devices use 0xffffffff for their | |
3102 | * best-effort flush timeout, so the clamping logic | |
3103 | * will result in a timeout that meets the above | |
3104 | * requirement. ERTM timeouts are 16-bit values, so | |
3105 | * the maximum timeout is 65.535 seconds. | |
3106 | */ | |
3107 | ||
3108 | /* Convert timeout to milliseconds and round */ | |
3109 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3110 | ||
3111 | /* This is the recommended formula for class 2 devices | |
3112 | * that start ERTM timers when packets are sent to the | |
3113 | * controller. | |
3114 | */ | |
3115 | ertm_to = 3 * ertm_to + 500; | |
3116 | ||
3117 | if (ertm_to > 0xffff) | |
3118 | ertm_to = 0xffff; | |
3119 | ||
3120 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3121 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3122 | } else { | |
3123 | rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
3124 | rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
3125 | } | |
3126 | } | |
3127 | ||
6327eb98 AE |
3128 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3129 | { | |
3130 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3131 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3132 | /* use extended control field */ |
3133 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3134 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3135 | } else { | |
6327eb98 | 3136 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3137 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3138 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3139 | } | |
c20f8e35 | 3140 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3141 | } |
3142 | ||
710f9b0a | 3143 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3144 | { |
1da177e4 | 3145 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3146 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3147 | void *ptr = req->data; |
c8f79162 | 3148 | u16 size; |
1da177e4 | 3149 | |
49208c9c | 3150 | BT_DBG("chan %p", chan); |
1da177e4 | 3151 | |
73ffa904 | 3152 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3153 | goto done; |
3154 | ||
0c1bc5c6 | 3155 | switch (chan->mode) { |
f2fcfcd6 GP |
3156 | case L2CAP_MODE_STREAMING: |
3157 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3158 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3159 | break; |
85eb53c6 | 3160 | |
848566b3 | 3161 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3162 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3163 | ||
2ba13ed6 | 3164 | /* fall through */ |
f2fcfcd6 | 3165 | default: |
8c1d787b | 3166 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3167 | break; |
3168 | } | |
3169 | ||
3170 | done: | |
0c1bc5c6 GP |
3171 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3172 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3173 | |
0c1bc5c6 | 3174 | switch (chan->mode) { |
65c7c491 | 3175 | case L2CAP_MODE_BASIC: |
8c1d787b | 3176 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3177 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3178 | break; |
3179 | ||
62547752 GP |
3180 | rfc.mode = L2CAP_MODE_BASIC; |
3181 | rfc.txwin_size = 0; | |
3182 | rfc.max_transmit = 0; | |
3183 | rfc.retrans_timeout = 0; | |
3184 | rfc.monitor_timeout = 0; | |
3185 | rfc.max_pdu_size = 0; | |
3186 | ||
63406504 | 3187 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3188 | (unsigned long) &rfc); |
65c7c491 MH |
3189 | break; |
3190 | ||
3191 | case L2CAP_MODE_ERTM: | |
3192 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3193 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3194 | |
3195 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
c8f79162 AE |
3196 | |
3197 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3198 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3199 | L2CAP_FCS_SIZE); | |
c8f79162 | 3200 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3201 | |
6327eb98 AE |
3202 | l2cap_txwin_setup(chan); |
3203 | ||
3204 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3205 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3206 | |
63406504 | 3207 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3208 | (unsigned long) &rfc); |
63406504 | 3209 | |
f89cef09 AE |
3210 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3211 | l2cap_add_opt_efs(&ptr, chan); | |
3212 | ||
6327eb98 AE |
3213 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3214 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3215 | chan->tx_win); |
60918918 AE |
3216 | |
3217 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3218 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3219 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3220 | chan->fcs = L2CAP_FCS_NONE; |
3221 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3222 | chan->fcs); | |
3223 | } | |
f2fcfcd6 GP |
3224 | break; |
3225 | ||
3226 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3227 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3228 | rfc.mode = L2CAP_MODE_STREAMING; |
3229 | rfc.txwin_size = 0; | |
3230 | rfc.max_transmit = 0; | |
3231 | rfc.retrans_timeout = 0; | |
3232 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3233 | |
3234 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3235 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3236 | L2CAP_FCS_SIZE); | |
c8f79162 | 3237 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3238 | |
63406504 | 3239 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3240 | (unsigned long) &rfc); |
63406504 | 3241 | |
f89cef09 AE |
3242 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3243 | l2cap_add_opt_efs(&ptr, chan); | |
3244 | ||
60918918 AE |
3245 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3246 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3247 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3248 | chan->fcs = L2CAP_FCS_NONE; |
3249 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3250 | chan->fcs); | |
3251 | } | |
65c7c491 MH |
3252 | break; |
3253 | } | |
1da177e4 | 3254 | |
fe4128e0 | 3255 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3256 | req->flags = __constant_cpu_to_le16(0); |
1da177e4 LT |
3257 | |
3258 | return ptr - data; | |
3259 | } | |
3260 | ||
73ffa904 | 3261 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3262 | { |
5dee9e7c MH |
3263 | struct l2cap_conf_rsp *rsp = data; |
3264 | void *ptr = rsp->data; | |
73ffa904 GP |
3265 | void *req = chan->conf_req; |
3266 | int len = chan->conf_len; | |
5dee9e7c MH |
3267 | int type, hint, olen; |
3268 | unsigned long val; | |
6464f35f | 3269 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3270 | struct l2cap_conf_efs efs; |
3271 | u8 remote_efs = 0; | |
861d6882 | 3272 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3273 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3274 | u16 size; |
1da177e4 | 3275 | |
73ffa904 | 3276 | BT_DBG("chan %p", chan); |
820ae1b8 | 3277 | |
5dee9e7c MH |
3278 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3279 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3280 | |
589d2746 | 3281 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3282 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3283 | |
3284 | switch (type) { | |
3285 | case L2CAP_CONF_MTU: | |
861d6882 | 3286 | mtu = val; |
5dee9e7c MH |
3287 | break; |
3288 | ||
3289 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3290 | chan->flush_to = val; |
5dee9e7c MH |
3291 | break; |
3292 | ||
3293 | case L2CAP_CONF_QOS: | |
3294 | break; | |
3295 | ||
6464f35f MH |
3296 | case L2CAP_CONF_RFC: |
3297 | if (olen == sizeof(rfc)) | |
3298 | memcpy(&rfc, (void *) val, olen); | |
3299 | break; | |
3300 | ||
fcc203c3 GP |
3301 | case L2CAP_CONF_FCS: |
3302 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3303 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3304 | break; |
fcc203c3 | 3305 | |
42dceae2 AE |
3306 | case L2CAP_CONF_EFS: |
3307 | remote_efs = 1; | |
3308 | if (olen == sizeof(efs)) | |
3309 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3310 | break; |
3311 | ||
6327eb98 | 3312 | case L2CAP_CONF_EWS: |
848566b3 | 3313 | if (!chan->conn->hs_enabled) |
6327eb98 | 3314 | return -ECONNREFUSED; |
fcc203c3 | 3315 | |
6327eb98 AE |
3316 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3317 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3318 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3319 | chan->remote_tx_win = val; |
fcc203c3 GP |
3320 | break; |
3321 | ||
5dee9e7c MH |
3322 | default: |
3323 | if (hint) | |
3324 | break; | |
3325 | ||
3326 | result = L2CAP_CONF_UNKNOWN; | |
3327 | *((u8 *) ptr++) = type; | |
3328 | break; | |
3329 | } | |
3330 | } | |
3331 | ||
73ffa904 | 3332 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3333 | goto done; |
3334 | ||
0c1bc5c6 | 3335 | switch (chan->mode) { |
f2fcfcd6 GP |
3336 | case L2CAP_MODE_STREAMING: |
3337 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3338 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3339 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3340 | chan->conn->feat_mask); |
85eb53c6 GP |
3341 | break; |
3342 | } | |
3343 | ||
42dceae2 | 3344 | if (remote_efs) { |
848566b3 | 3345 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3346 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3347 | else | |
3348 | return -ECONNREFUSED; | |
3349 | } | |
3350 | ||
0c1bc5c6 | 3351 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3352 | return -ECONNREFUSED; |
742e519b | 3353 | |
f2fcfcd6 | 3354 | break; |
f2fcfcd6 GP |
3355 | } |
3356 | ||
3357 | done: | |
0c1bc5c6 | 3358 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3359 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3360 | rfc.mode = chan->mode; |
f2fcfcd6 | 3361 | |
73ffa904 | 3362 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3363 | return -ECONNREFUSED; |
3364 | ||
2d792818 GP |
3365 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3366 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3367 | } |
3368 | ||
5dee9e7c MH |
3369 | if (result == L2CAP_CONF_SUCCESS) { |
3370 | /* Configure output options and let the other side know | |
3371 | * which ones we don't like. */ | |
3372 | ||
f2fcfcd6 GP |
3373 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3374 | result = L2CAP_CONF_UNACCEPT; | |
3375 | else { | |
0c1bc5c6 | 3376 | chan->omtu = mtu; |
c1360a1c | 3377 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3378 | } |
0c1bc5c6 | 3379 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3380 | |
42dceae2 AE |
3381 | if (remote_efs) { |
3382 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3383 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3384 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3385 | |
3386 | result = L2CAP_CONF_UNACCEPT; | |
3387 | ||
3388 | if (chan->num_conf_req >= 1) | |
3389 | return -ECONNREFUSED; | |
3390 | ||
3391 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3392 | sizeof(efs), |
3393 | (unsigned long) &efs); | |
0e8b207e | 3394 | } else { |
3e6b3b95 | 3395 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3396 | result = L2CAP_CONF_PENDING; |
3397 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3398 | } |
3399 | } | |
3400 | ||
f2fcfcd6 GP |
3401 | switch (rfc.mode) { |
3402 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3403 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3404 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3405 | break; |
3406 | ||
3407 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3408 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3409 | chan->remote_tx_win = rfc.txwin_size; | |
3410 | else | |
3411 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3412 | |
2c03a7a4 | 3413 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3414 | |
c8f79162 | 3415 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3416 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3417 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3418 | rfc.max_pdu_size = cpu_to_le16(size); |
3419 | chan->remote_mps = size; | |
f2fcfcd6 | 3420 | |
36c86c85 | 3421 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3422 | |
c1360a1c | 3423 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3424 | |
3425 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3426 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3427 | |
42dceae2 AE |
3428 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3429 | chan->remote_id = efs.id; | |
3430 | chan->remote_stype = efs.stype; | |
3431 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3432 | chan->remote_flush_to = | |
2d792818 | 3433 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3434 | chan->remote_acc_lat = |
2d792818 | 3435 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3436 | chan->remote_sdu_itime = |
3437 | le32_to_cpu(efs.sdu_itime); | |
3438 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3439 | sizeof(efs), |
3440 | (unsigned long) &efs); | |
42dceae2 | 3441 | } |
f2fcfcd6 GP |
3442 | break; |
3443 | ||
3444 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3445 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3446 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3447 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3448 | rfc.max_pdu_size = cpu_to_le16(size); |
3449 | chan->remote_mps = size; | |
f2fcfcd6 | 3450 | |
c1360a1c | 3451 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3452 | |
2d792818 GP |
3453 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3454 | (unsigned long) &rfc); | |
68ae6639 | 3455 | |
f2fcfcd6 GP |
3456 | break; |
3457 | ||
3458 | default: | |
5dee9e7c | 3459 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3460 | |
6464f35f | 3461 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3462 | rfc.mode = chan->mode; |
f2fcfcd6 | 3463 | } |
6464f35f | 3464 | |
f2fcfcd6 | 3465 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3466 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3467 | } |
fe4128e0 | 3468 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3469 | rsp->result = cpu_to_le16(result); |
59e54bd1 | 3470 | rsp->flags = __constant_cpu_to_le16(0); |
5dee9e7c MH |
3471 | |
3472 | return ptr - data; | |
1da177e4 LT |
3473 | } |
3474 | ||
2d792818 GP |
3475 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3476 | void *data, u16 *result) | |
f2fcfcd6 | 3477 | { |
f2fcfcd6 GP |
3478 | struct l2cap_conf_req *req = data; |
3479 | void *ptr = req->data; | |
3480 | int type, olen; | |
3481 | unsigned long val; | |
36e999a8 | 3482 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3483 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3484 | |
fe4128e0 | 3485 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3486 | |
3487 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3488 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3489 | ||
3490 | switch (type) { | |
3491 | case L2CAP_CONF_MTU: | |
3492 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3493 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3494 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3495 | } else |
0c1bc5c6 GP |
3496 | chan->imtu = val; |
3497 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3498 | break; |
3499 | ||
3500 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3501 | chan->flush_to = val; |
f2fcfcd6 | 3502 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3503 | 2, chan->flush_to); |
f2fcfcd6 GP |
3504 | break; |
3505 | ||
3506 | case L2CAP_CONF_RFC: | |
3507 | if (olen == sizeof(rfc)) | |
3508 | memcpy(&rfc, (void *)val, olen); | |
3509 | ||
c1360a1c | 3510 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3511 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3512 | return -ECONNREFUSED; |
3513 | ||
47d1ec61 | 3514 | chan->fcs = 0; |
f2fcfcd6 GP |
3515 | |
3516 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3517 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3518 | break; |
6327eb98 AE |
3519 | |
3520 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3521 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3522 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3523 | chan->tx_win); |
6327eb98 | 3524 | break; |
66af7aaf AE |
3525 | |
3526 | case L2CAP_CONF_EFS: | |
3527 | if (olen == sizeof(efs)) | |
3528 | memcpy(&efs, (void *)val, olen); | |
3529 | ||
3530 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3531 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3532 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3533 | return -ECONNREFUSED; |
3534 | ||
2d792818 GP |
3535 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3536 | (unsigned long) &efs); | |
66af7aaf | 3537 | break; |
cbabee78 AE |
3538 | |
3539 | case L2CAP_CONF_FCS: | |
3540 | if (*result == L2CAP_CONF_PENDING) | |
3541 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3542 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3543 | &chan->conf_state); |
3544 | break; | |
f2fcfcd6 GP |
3545 | } |
3546 | } | |
3547 | ||
0c1bc5c6 | 3548 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3549 | return -ECONNREFUSED; |
3550 | ||
0c1bc5c6 | 3551 | chan->mode = rfc.mode; |
6c2ea7a8 | 3552 | |
0e8b207e | 3553 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3554 | switch (rfc.mode) { |
3555 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3556 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3557 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3558 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3559 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3560 | chan->ack_win = min_t(u16, chan->ack_win, | |
3561 | rfc.txwin_size); | |
66af7aaf AE |
3562 | |
3563 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3564 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3565 | chan->local_sdu_itime = | |
2d792818 | 3566 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3567 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3568 | chan->local_flush_to = | |
2d792818 | 3569 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3570 | } |
f2fcfcd6 | 3571 | break; |
66af7aaf | 3572 | |
f2fcfcd6 | 3573 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3574 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3575 | } |
3576 | } | |
3577 | ||
fe4128e0 | 3578 | req->dcid = cpu_to_le16(chan->dcid); |
59e54bd1 | 3579 | req->flags = __constant_cpu_to_le16(0); |
f2fcfcd6 GP |
3580 | |
3581 | return ptr - data; | |
3582 | } | |
3583 | ||
2d792818 GP |
3584 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3585 | u16 result, u16 flags) | |
1da177e4 LT |
3586 | { |
3587 | struct l2cap_conf_rsp *rsp = data; | |
3588 | void *ptr = rsp->data; | |
1da177e4 | 3589 | |
fe4128e0 | 3590 | BT_DBG("chan %p", chan); |
1da177e4 | 3591 | |
fe4128e0 | 3592 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3593 | rsp->result = cpu_to_le16(result); |
aca3192c | 3594 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3595 | |
3596 | return ptr - data; | |
3597 | } | |
3598 | ||
27e2d4c8 JH |
3599 | void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) |
3600 | { | |
3601 | struct l2cap_le_conn_rsp rsp; | |
3602 | struct l2cap_conn *conn = chan->conn; | |
3603 | ||
3604 | BT_DBG("chan %p", chan); | |
3605 | ||
3606 | rsp.dcid = cpu_to_le16(chan->scid); | |
3607 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 3608 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 3609 | rsp.credits = cpu_to_le16(chan->rx_credits); |
27e2d4c8 JH |
3610 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3611 | ||
3612 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
3613 | &rsp); | |
3614 | } | |
3615 | ||
8c1d787b | 3616 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3617 | { |
3618 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3619 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3620 | u8 buf[128]; |
439f34ac | 3621 | u8 rsp_code; |
710f9b0a | 3622 | |
fe4128e0 GP |
3623 | rsp.scid = cpu_to_le16(chan->dcid); |
3624 | rsp.dcid = cpu_to_le16(chan->scid); | |
ac73498c AE |
3625 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
3626 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3627 | |
3628 | if (chan->hs_hcon) | |
3629 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3630 | else | |
3631 | rsp_code = L2CAP_CONN_RSP; | |
3632 | ||
3633 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3634 | ||
3635 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3636 | |
c1360a1c | 3637 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3638 | return; |
3639 | ||
710f9b0a | 3640 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3641 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3642 | chan->num_conf_req++; |
3643 | } | |
3644 | ||
47d1ec61 | 3645 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3646 | { |
7b1c0049 GP |
3647 | int type, olen; |
3648 | unsigned long val; | |
c20f8e35 MM |
3649 | /* Use sane default values in case a misbehaving remote device |
3650 | * did not send an RFC or extended window size option. | |
3651 | */ | |
3652 | u16 txwin_ext = chan->ack_win; | |
3653 | struct l2cap_conf_rfc rfc = { | |
3654 | .mode = chan->mode, | |
3655 | .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), | |
3656 | .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
3657 | .max_pdu_size = cpu_to_le16(chan->imtu), | |
3658 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3659 | }; | |
7b1c0049 | 3660 | |
47d1ec61 | 3661 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3662 | |
0c1bc5c6 | 3663 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3664 | return; |
3665 | ||
3666 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3667 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3668 | ||
c20f8e35 MM |
3669 | switch (type) { |
3670 | case L2CAP_CONF_RFC: | |
3671 | if (olen == sizeof(rfc)) | |
3672 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3673 | break; |
c20f8e35 MM |
3674 | case L2CAP_CONF_EWS: |
3675 | txwin_ext = val; | |
3676 | break; | |
3677 | } | |
7b1c0049 GP |
3678 | } |
3679 | ||
7b1c0049 GP |
3680 | switch (rfc.mode) { |
3681 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3682 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3683 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3684 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3685 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3686 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3687 | else | |
3688 | chan->ack_win = min_t(u16, chan->ack_win, | |
3689 | rfc.txwin_size); | |
7b1c0049 GP |
3690 | break; |
3691 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3692 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3693 | } |
3694 | } | |
3695 | ||
2d792818 | 3696 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3697 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3698 | u8 *data) | |
4e8402a3 | 3699 | { |
e2fd318e | 3700 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3701 | |
cb3b3152 JH |
3702 | if (cmd_len < sizeof(*rej)) |
3703 | return -EPROTO; | |
3704 | ||
e2fd318e | 3705 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3706 | return 0; |
3707 | ||
3708 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3709 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3710 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3711 | |
3712 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3713 | conn->info_ident = 0; |
984947dc | 3714 | |
4e8402a3 MH |
3715 | l2cap_conn_start(conn); |
3716 | } | |
3717 | ||
3718 | return 0; | |
3719 | } | |
3720 | ||
1700915f MM |
3721 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3722 | struct l2cap_cmd_hdr *cmd, | |
3723 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3724 | { |
1da177e4 LT |
3725 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3726 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3727 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3728 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3729 | |
3730 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3731 | __le16 psm = req->psm; |
1da177e4 | 3732 | |
097db76c | 3733 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3734 | |
3735 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3736 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
bf20fd4e | 3737 | &conn->hcon->dst, ACL_LINK); |
23691d75 | 3738 | if (!pchan) { |
1da177e4 LT |
3739 | result = L2CAP_CR_BAD_PSM; |
3740 | goto sendresp; | |
3741 | } | |
3742 | ||
3df91ea2 | 3743 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3744 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3745 | |
e7c29cb1 | 3746 | /* Check if the ACL is secure enough (if not SDP) */ |
2983fd68 | 3747 | if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3748 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3749 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3750 | result = L2CAP_CR_SEC_BLOCK; |
3751 | goto response; | |
3752 | } | |
3753 | ||
1da177e4 LT |
3754 | result = L2CAP_CR_NO_MEM; |
3755 | ||
2dfa1003 GP |
3756 | /* Check if we already have channel with that dcid */ |
3757 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3758 | goto response; | |
3759 | ||
80b98027 | 3760 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3761 | if (!chan) |
1da177e4 LT |
3762 | goto response; |
3763 | ||
330b6c15 SS |
3764 | /* For certain devices (ex: HID mouse), support for authentication, |
3765 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3766 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3767 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3768 | */ | |
3769 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3770 | ||
7eafc59e MH |
3771 | bacpy(&chan->src, &conn->hcon->src); |
3772 | bacpy(&chan->dst, &conn->hcon->dst); | |
4f1654e0 MH |
3773 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); |
3774 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
fe4128e0 GP |
3775 | chan->psm = psm; |
3776 | chan->dcid = scid; | |
1700915f | 3777 | chan->local_amp_id = amp_id; |
1da177e4 | 3778 | |
6be36555 | 3779 | __l2cap_chan_add(conn, chan); |
48454079 | 3780 | |
fe4128e0 | 3781 | dcid = chan->scid; |
1da177e4 | 3782 | |
8d836d71 | 3783 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3784 | |
fc7f8a7e | 3785 | chan->ident = cmd->ident; |
1da177e4 | 3786 | |
984947dc | 3787 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3788 | if (l2cap_chan_check_security(chan)) { |
bdc25783 | 3789 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3790 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3791 | result = L2CAP_CR_PEND; |
3792 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3793 | chan->ops->defer(chan); |
f66dc81f | 3794 | } else { |
1700915f MM |
3795 | /* Force pending result for AMP controllers. |
3796 | * The connection will succeed after the | |
3797 | * physical link is up. | |
3798 | */ | |
6ed971ca | 3799 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3800 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3801 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3802 | } else { |
f93fa273 | 3803 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3804 | result = L2CAP_CR_PEND; |
1700915f | 3805 | } |
f66dc81f MH |
3806 | status = L2CAP_CS_NO_INFO; |
3807 | } | |
79d554a6 | 3808 | } else { |
f93fa273 | 3809 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3810 | result = L2CAP_CR_PEND; |
3811 | status = L2CAP_CS_AUTHEN_PEND; | |
3812 | } | |
3813 | } else { | |
f93fa273 | 3814 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3815 | result = L2CAP_CR_PEND; |
3816 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3817 | } |
3818 | ||
1da177e4 | 3819 | response: |
8ffb9290 | 3820 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3821 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3822 | |
3823 | sendresp: | |
aca3192c YH |
3824 | rsp.scid = cpu_to_le16(scid); |
3825 | rsp.dcid = cpu_to_le16(dcid); | |
3826 | rsp.result = cpu_to_le16(result); | |
3827 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3828 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3829 | |
3830 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3831 | struct l2cap_info_req info; | |
ac73498c | 3832 | info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3833 | |
3834 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3835 | conn->info_ident = l2cap_get_ident(conn); | |
3836 | ||
ba13ccd9 | 3837 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3838 | |
2d792818 GP |
3839 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3840 | sizeof(info), &info); | |
79d554a6 MH |
3841 | } |
3842 | ||
c1360a1c | 3843 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3844 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3845 | u8 buf[128]; |
c1360a1c | 3846 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3847 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3848 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3849 | chan->num_conf_req++; |
e9aeb2dd | 3850 | } |
1700915f MM |
3851 | |
3852 | return chan; | |
4c89b6aa | 3853 | } |
e9aeb2dd | 3854 | |
4c89b6aa | 3855 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3856 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3857 | { |
7b064eda JK |
3858 | struct hci_dev *hdev = conn->hcon->hdev; |
3859 | struct hci_conn *hcon = conn->hcon; | |
3860 | ||
cb3b3152 JH |
3861 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3862 | return -EPROTO; | |
3863 | ||
7b064eda JK |
3864 | hci_dev_lock(hdev); |
3865 | if (test_bit(HCI_MGMT, &hdev->dev_flags) && | |
3866 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) | |
3867 | mgmt_device_connected(hdev, &hcon->dst, hcon->type, | |
3868 | hcon->dst_type, 0, NULL, 0, | |
3869 | hcon->dev_class); | |
3870 | hci_dev_unlock(hdev); | |
3871 | ||
300229f9 | 3872 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3873 | return 0; |
3874 | } | |
3875 | ||
5909cf30 | 3876 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3877 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3878 | u8 *data) | |
1da177e4 LT |
3879 | { |
3880 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3881 | u16 scid, dcid, result, status; | |
48454079 | 3882 | struct l2cap_chan *chan; |
1da177e4 | 3883 | u8 req[128]; |
3df91ea2 | 3884 | int err; |
1da177e4 | 3885 | |
cb3b3152 JH |
3886 | if (cmd_len < sizeof(*rsp)) |
3887 | return -EPROTO; | |
3888 | ||
1da177e4 LT |
3889 | scid = __le16_to_cpu(rsp->scid); |
3890 | dcid = __le16_to_cpu(rsp->dcid); | |
3891 | result = __le16_to_cpu(rsp->result); | |
3892 | status = __le16_to_cpu(rsp->status); | |
3893 | ||
1b009c98 | 3894 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3895 | dcid, scid, result, status); |
1da177e4 | 3896 | |
3df91ea2 AE |
3897 | mutex_lock(&conn->chan_lock); |
3898 | ||
1da177e4 | 3899 | if (scid) { |
3df91ea2 AE |
3900 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3901 | if (!chan) { | |
21870b52 | 3902 | err = -EBADSLT; |
3df91ea2 AE |
3903 | goto unlock; |
3904 | } | |
1da177e4 | 3905 | } else { |
3df91ea2 AE |
3906 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3907 | if (!chan) { | |
21870b52 | 3908 | err = -EBADSLT; |
3df91ea2 AE |
3909 | goto unlock; |
3910 | } | |
1da177e4 LT |
3911 | } |
3912 | ||
3df91ea2 AE |
3913 | err = 0; |
3914 | ||
6be36555 | 3915 | l2cap_chan_lock(chan); |
48454079 | 3916 | |
1da177e4 LT |
3917 | switch (result) { |
3918 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3919 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3920 | chan->ident = 0; |
fe4128e0 | 3921 | chan->dcid = dcid; |
c1360a1c | 3922 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3923 | |
c1360a1c | 3924 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3925 | break; |
3926 | ||
1da177e4 | 3927 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3928 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3929 | chan->num_conf_req++; |
1da177e4 LT |
3930 | break; |
3931 | ||
3932 | case L2CAP_CR_PEND: | |
c1360a1c | 3933 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3934 | break; |
3935 | ||
3936 | default: | |
48454079 | 3937 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3938 | break; |
3939 | } | |
3940 | ||
6be36555 | 3941 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3942 | |
3943 | unlock: | |
3944 | mutex_unlock(&conn->chan_lock); | |
3945 | ||
3946 | return err; | |
1da177e4 LT |
3947 | } |
3948 | ||
47d1ec61 | 3949 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3950 | { |
3951 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3952 | * sides request it. | |
3953 | */ | |
0c1bc5c6 | 3954 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3955 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 3956 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 3957 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3958 | } |
3959 | ||
29d8a590 AE |
3960 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3961 | u8 ident, u16 flags) | |
3962 | { | |
3963 | struct l2cap_conn *conn = chan->conn; | |
3964 | ||
3965 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3966 | flags); | |
3967 | ||
3968 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3969 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3970 | ||
3971 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
3972 | l2cap_build_conf_rsp(chan, data, | |
3973 | L2CAP_CONF_SUCCESS, flags), data); | |
3974 | } | |
3975 | ||
662d652d JH |
3976 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
3977 | u16 scid, u16 dcid) | |
3978 | { | |
3979 | struct l2cap_cmd_rej_cid rej; | |
3980 | ||
3981 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
3982 | rej.scid = __cpu_to_le16(scid); | |
3983 | rej.dcid = __cpu_to_le16(dcid); | |
3984 | ||
3985 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
3986 | } | |
3987 | ||
2d792818 GP |
3988 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
3989 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3990 | u8 *data) | |
1da177e4 LT |
3991 | { |
3992 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3993 | u16 dcid, flags; | |
3994 | u8 rsp[64]; | |
48454079 | 3995 | struct l2cap_chan *chan; |
3c588192 | 3996 | int len, err = 0; |
1da177e4 | 3997 | |
cb3b3152 JH |
3998 | if (cmd_len < sizeof(*req)) |
3999 | return -EPROTO; | |
4000 | ||
1da177e4 LT |
4001 | dcid = __le16_to_cpu(req->dcid); |
4002 | flags = __le16_to_cpu(req->flags); | |
4003 | ||
4004 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
4005 | ||
baa7e1fa | 4006 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
4007 | if (!chan) { |
4008 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
4009 | return 0; | |
4010 | } | |
1da177e4 | 4011 | |
033b1142 | 4012 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
4013 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4014 | chan->dcid); | |
354f60a9 | 4015 | goto unlock; |
df6bd743 | 4016 | } |
354f60a9 | 4017 | |
5dee9e7c | 4018 | /* Reject if config buffer is too small. */ |
88219a0f | 4019 | len = cmd_len - sizeof(*req); |
cb3b3152 | 4020 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4021 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4022 | l2cap_build_conf_rsp(chan, rsp, |
4023 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4024 | goto unlock; |
4025 | } | |
4026 | ||
4027 | /* Store config. */ | |
73ffa904 GP |
4028 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4029 | chan->conf_len += len; | |
1da177e4 | 4030 | |
59e54bd1 | 4031 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4032 | /* Incomplete config. Send empty response. */ |
4033 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4034 | l2cap_build_conf_rsp(chan, rsp, |
4035 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4036 | goto unlock; |
4037 | } | |
4038 | ||
4039 | /* Complete config. */ | |
73ffa904 | 4040 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4041 | if (len < 0) { |
5e4e3972 | 4042 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4043 | goto unlock; |
f2fcfcd6 | 4044 | } |
1da177e4 | 4045 | |
1500109b | 4046 | chan->ident = cmd->ident; |
5dee9e7c | 4047 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4048 | chan->num_conf_rsp++; |
5dee9e7c | 4049 | |
5dee9e7c | 4050 | /* Reset config buffer. */ |
73ffa904 | 4051 | chan->conf_len = 0; |
5dee9e7c | 4052 | |
c1360a1c | 4053 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4054 | goto unlock; |
4055 | ||
c1360a1c | 4056 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4057 | set_default_fcs(chan); |
fcc203c3 | 4058 | |
105bdf9e MM |
4059 | if (chan->mode == L2CAP_MODE_ERTM || |
4060 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4061 | err = l2cap_ertm_init(chan); |
4062 | ||
4063 | if (err < 0) | |
5e4e3972 | 4064 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4065 | else |
4066 | l2cap_chan_ready(chan); | |
0565c1c2 | 4067 | |
876d9484 MH |
4068 | goto unlock; |
4069 | } | |
4070 | ||
c1360a1c | 4071 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4072 | u8 buf[64]; |
1da177e4 | 4073 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4074 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4075 | chan->num_conf_req++; |
1da177e4 LT |
4076 | } |
4077 | ||
0e8b207e AE |
4078 | /* Got Conf Rsp PENDING from remote side and asume we sent |
4079 | Conf Rsp PENDING in the code above */ | |
4080 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4081 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4082 | |
4083 | /* check compatibility */ | |
4084 | ||
79de886d | 4085 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4086 | if (!chan->hs_hcon) |
79de886d AE |
4087 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4088 | else | |
4089 | chan->ident = cmd->ident; | |
0e8b207e AE |
4090 | } |
4091 | ||
1da177e4 | 4092 | unlock: |
6be36555 | 4093 | l2cap_chan_unlock(chan); |
3c588192 | 4094 | return err; |
1da177e4 LT |
4095 | } |
4096 | ||
2d792818 | 4097 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4098 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4099 | u8 *data) | |
1da177e4 LT |
4100 | { |
4101 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4102 | u16 scid, flags, result; | |
48454079 | 4103 | struct l2cap_chan *chan; |
cb3b3152 | 4104 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4105 | int err = 0; |
1da177e4 | 4106 | |
cb3b3152 JH |
4107 | if (cmd_len < sizeof(*rsp)) |
4108 | return -EPROTO; | |
4109 | ||
1da177e4 LT |
4110 | scid = __le16_to_cpu(rsp->scid); |
4111 | flags = __le16_to_cpu(rsp->flags); | |
4112 | result = __le16_to_cpu(rsp->result); | |
4113 | ||
61386cba AE |
4114 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4115 | result, len); | |
1da177e4 | 4116 | |
baa7e1fa | 4117 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4118 | if (!chan) |
1da177e4 LT |
4119 | return 0; |
4120 | ||
4121 | switch (result) { | |
4122 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4123 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4124 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4125 | break; |
4126 | ||
0e8b207e AE |
4127 | case L2CAP_CONF_PENDING: |
4128 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4129 | ||
4130 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4131 | char buf[64]; | |
4132 | ||
4133 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4134 | buf, &result); |
0e8b207e | 4135 | if (len < 0) { |
5e4e3972 | 4136 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4137 | goto done; |
4138 | } | |
4139 | ||
f351bc72 | 4140 | if (!chan->hs_hcon) { |
79de886d AE |
4141 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4142 | 0); | |
5ce66b59 AE |
4143 | } else { |
4144 | if (l2cap_check_efs(chan)) { | |
4145 | amp_create_logical_link(chan); | |
4146 | chan->ident = cmd->ident; | |
4147 | } | |
4148 | } | |
0e8b207e AE |
4149 | } |
4150 | goto done; | |
4151 | ||
1da177e4 | 4152 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4153 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4154 | char req[64]; |
4155 | ||
c2c77ec8 | 4156 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4157 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4158 | goto done; |
4159 | } | |
4160 | ||
f2fcfcd6 GP |
4161 | /* throw out any old stored conf requests */ |
4162 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4163 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4164 | req, &result); |
f2fcfcd6 | 4165 | if (len < 0) { |
5e4e3972 | 4166 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4167 | goto done; |
4168 | } | |
4169 | ||
4170 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4171 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4172 | chan->num_conf_req++; |
f2fcfcd6 GP |
4173 | if (result != L2CAP_CONF_SUCCESS) |
4174 | goto done; | |
4175 | break; | |
1da177e4 LT |
4176 | } |
4177 | ||
8e87d142 | 4178 | default: |
6be36555 | 4179 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4180 | |
ba13ccd9 | 4181 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4182 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4183 | goto done; |
4184 | } | |
4185 | ||
59e54bd1 | 4186 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4187 | goto done; |
4188 | ||
c1360a1c | 4189 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4190 | |
c1360a1c | 4191 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4192 | set_default_fcs(chan); |
fcc203c3 | 4193 | |
105bdf9e MM |
4194 | if (chan->mode == L2CAP_MODE_ERTM || |
4195 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4196 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4197 | |
3c588192 | 4198 | if (err < 0) |
5e4e3972 | 4199 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4200 | else |
4201 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4202 | } |
4203 | ||
4204 | done: | |
6be36555 | 4205 | l2cap_chan_unlock(chan); |
3c588192 | 4206 | return err; |
1da177e4 LT |
4207 | } |
4208 | ||
2d792818 | 4209 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4210 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4211 | u8 *data) | |
1da177e4 LT |
4212 | { |
4213 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4214 | struct l2cap_disconn_rsp rsp; | |
4215 | u16 dcid, scid; | |
48454079 | 4216 | struct l2cap_chan *chan; |
1da177e4 | 4217 | |
cb3b3152 JH |
4218 | if (cmd_len != sizeof(*req)) |
4219 | return -EPROTO; | |
4220 | ||
1da177e4 LT |
4221 | scid = __le16_to_cpu(req->scid); |
4222 | dcid = __le16_to_cpu(req->dcid); | |
4223 | ||
4224 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4225 | ||
3df91ea2 AE |
4226 | mutex_lock(&conn->chan_lock); |
4227 | ||
4228 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4229 | if (!chan) { | |
4230 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4231 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4232 | return 0; | |
3df91ea2 | 4233 | } |
1da177e4 | 4234 | |
6be36555 AE |
4235 | l2cap_chan_lock(chan); |
4236 | ||
fe4128e0 GP |
4237 | rsp.dcid = cpu_to_le16(chan->scid); |
4238 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4239 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4240 | ||
5ec1bbe5 | 4241 | chan->ops->set_shutdown(chan); |
1da177e4 | 4242 | |
61d6ef3e | 4243 | l2cap_chan_hold(chan); |
48454079 | 4244 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4245 | |
4246 | l2cap_chan_unlock(chan); | |
1da177e4 | 4247 | |
80b98027 | 4248 | chan->ops->close(chan); |
61d6ef3e | 4249 | l2cap_chan_put(chan); |
3df91ea2 AE |
4250 | |
4251 | mutex_unlock(&conn->chan_lock); | |
4252 | ||
1da177e4 LT |
4253 | return 0; |
4254 | } | |
4255 | ||
2d792818 | 4256 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4257 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4258 | u8 *data) | |
1da177e4 LT |
4259 | { |
4260 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4261 | u16 dcid, scid; | |
48454079 | 4262 | struct l2cap_chan *chan; |
1da177e4 | 4263 | |
cb3b3152 JH |
4264 | if (cmd_len != sizeof(*rsp)) |
4265 | return -EPROTO; | |
4266 | ||
1da177e4 LT |
4267 | scid = __le16_to_cpu(rsp->scid); |
4268 | dcid = __le16_to_cpu(rsp->dcid); | |
4269 | ||
4270 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4271 | ||
3df91ea2 AE |
4272 | mutex_lock(&conn->chan_lock); |
4273 | ||
4274 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4275 | if (!chan) { | |
4276 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4277 | return 0; |
3df91ea2 | 4278 | } |
1da177e4 | 4279 | |
6be36555 | 4280 | l2cap_chan_lock(chan); |
48454079 | 4281 | |
61d6ef3e | 4282 | l2cap_chan_hold(chan); |
48454079 | 4283 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4284 | |
4285 | l2cap_chan_unlock(chan); | |
1da177e4 | 4286 | |
80b98027 | 4287 | chan->ops->close(chan); |
61d6ef3e | 4288 | l2cap_chan_put(chan); |
3df91ea2 AE |
4289 | |
4290 | mutex_unlock(&conn->chan_lock); | |
4291 | ||
1da177e4 LT |
4292 | return 0; |
4293 | } | |
4294 | ||
2d792818 | 4295 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4296 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4297 | u8 *data) | |
1da177e4 LT |
4298 | { |
4299 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4300 | u16 type; |
4301 | ||
cb3b3152 JH |
4302 | if (cmd_len != sizeof(*req)) |
4303 | return -EPROTO; | |
4304 | ||
1da177e4 LT |
4305 | type = __le16_to_cpu(req->type); |
4306 | ||
4307 | BT_DBG("type 0x%4.4x", type); | |
4308 | ||
f0709e03 MH |
4309 | if (type == L2CAP_IT_FEAT_MASK) { |
4310 | u8 buf[8]; | |
44dd46de | 4311 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4312 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
ac73498c AE |
4313 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4314 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4315 | if (!disable_ertm) |
fcc203c3 | 4316 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4317 | | L2CAP_FEAT_FCS; |
848566b3 | 4318 | if (conn->hs_enabled) |
6327eb98 | 4319 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4320 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4321 | |
1b7bf4ed | 4322 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4323 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4324 | buf); | |
e1027a7c MH |
4325 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4326 | u8 buf[12]; | |
4327 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4328 | |
848566b3 | 4329 | if (conn->hs_enabled) |
50a147cd MM |
4330 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; |
4331 | else | |
4332 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
4333 | ||
ac73498c AE |
4334 | rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4335 | rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 4336 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
2d792818 GP |
4337 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4338 | buf); | |
f0709e03 MH |
4339 | } else { |
4340 | struct l2cap_info_rsp rsp; | |
4341 | rsp.type = cpu_to_le16(type); | |
ac73498c | 4342 | rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4343 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4344 | &rsp); | |
f0709e03 | 4345 | } |
1da177e4 LT |
4346 | |
4347 | return 0; | |
4348 | } | |
4349 | ||
2d792818 | 4350 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4351 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4352 | u8 *data) | |
1da177e4 LT |
4353 | { |
4354 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4355 | u16 type, result; | |
4356 | ||
3f6fa3d4 | 4357 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4358 | return -EPROTO; |
4359 | ||
1da177e4 LT |
4360 | type = __le16_to_cpu(rsp->type); |
4361 | result = __le16_to_cpu(rsp->result); | |
4362 | ||
4363 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4364 | ||
e90165be AE |
4365 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4366 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4367 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4368 | return 0; |
4369 | ||
17cd3f37 | 4370 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4371 | |
adb08ede VT |
4372 | if (result != L2CAP_IR_SUCCESS) { |
4373 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4374 | conn->info_ident = 0; | |
4375 | ||
4376 | l2cap_conn_start(conn); | |
4377 | ||
4378 | return 0; | |
4379 | } | |
4380 | ||
978c93b9 AE |
4381 | switch (type) { |
4382 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4383 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4384 | |
47ec1dcd | 4385 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4386 | struct l2cap_info_req req; |
ac73498c | 4387 | req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4388 | |
4389 | conn->info_ident = l2cap_get_ident(conn); | |
4390 | ||
4391 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4392 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4393 | } else { |
4394 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4395 | conn->info_ident = 0; | |
4396 | ||
4397 | l2cap_conn_start(conn); | |
4398 | } | |
978c93b9 AE |
4399 | break; |
4400 | ||
4401 | case L2CAP_IT_FIXED_CHAN: | |
4402 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 4403 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4404 | conn->info_ident = 0; |
984947dc MH |
4405 | |
4406 | l2cap_conn_start(conn); | |
978c93b9 | 4407 | break; |
984947dc | 4408 | } |
4e8402a3 | 4409 | |
1da177e4 LT |
4410 | return 0; |
4411 | } | |
4412 | ||
1700915f MM |
4413 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4414 | struct l2cap_cmd_hdr *cmd, | |
4415 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4416 | { |
4417 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4418 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4419 | struct l2cap_chan *chan; |
6e1df6a6 | 4420 | struct hci_dev *hdev; |
f94ff6ff MM |
4421 | u16 psm, scid; |
4422 | ||
4423 | if (cmd_len != sizeof(*req)) | |
4424 | return -EPROTO; | |
4425 | ||
848566b3 | 4426 | if (!conn->hs_enabled) |
f94ff6ff MM |
4427 | return -EINVAL; |
4428 | ||
4429 | psm = le16_to_cpu(req->psm); | |
4430 | scid = le16_to_cpu(req->scid); | |
4431 | ||
ad0ac6ca | 4432 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4433 | |
6e1df6a6 | 4434 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4435 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4436 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4437 | req->amp_id); | |
4438 | return 0; | |
4439 | } | |
1700915f | 4440 | |
6e1df6a6 AE |
4441 | /* Validate AMP controller id */ |
4442 | hdev = hci_dev_get(req->amp_id); | |
4443 | if (!hdev) | |
4444 | goto error; | |
1700915f | 4445 | |
6e1df6a6 AE |
4446 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4447 | hci_dev_put(hdev); | |
4448 | goto error; | |
4449 | } | |
1700915f | 4450 | |
6e1df6a6 AE |
4451 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4452 | req->amp_id); | |
4453 | if (chan) { | |
4454 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4455 | struct hci_conn *hs_hcon; | |
1700915f | 4456 | |
98e0f7ea MH |
4457 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4458 | &conn->hcon->dst); | |
6e1df6a6 AE |
4459 | if (!hs_hcon) { |
4460 | hci_dev_put(hdev); | |
662d652d JH |
4461 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4462 | chan->dcid); | |
4463 | return 0; | |
1700915f MM |
4464 | } |
4465 | ||
6e1df6a6 AE |
4466 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4467 | ||
6e1df6a6 AE |
4468 | mgr->bredr_chan = chan; |
4469 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4470 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4471 | conn->mtu = hdev->block_mtu; |
1700915f | 4472 | } |
f94ff6ff | 4473 | |
6e1df6a6 | 4474 | hci_dev_put(hdev); |
f94ff6ff MM |
4475 | |
4476 | return 0; | |
6e1df6a6 AE |
4477 | |
4478 | error: | |
4479 | rsp.dcid = 0; | |
4480 | rsp.scid = cpu_to_le16(scid); | |
4481 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP); | |
4482 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
4483 | ||
4484 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4485 | sizeof(rsp), &rsp); | |
4486 | ||
dc280801 | 4487 | return 0; |
f94ff6ff MM |
4488 | } |
4489 | ||
8eb200bd MM |
4490 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4491 | { | |
4492 | struct l2cap_move_chan_req req; | |
4493 | u8 ident; | |
4494 | ||
4495 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4496 | ||
4497 | ident = l2cap_get_ident(chan->conn); | |
4498 | chan->ident = ident; | |
4499 | ||
4500 | req.icid = cpu_to_le16(chan->scid); | |
4501 | req.dest_amp_id = dest_amp_id; | |
4502 | ||
4503 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4504 | &req); | |
4505 | ||
4506 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4507 | } | |
4508 | ||
1500109b | 4509 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4510 | { |
4511 | struct l2cap_move_chan_rsp rsp; | |
4512 | ||
1500109b | 4513 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4514 | |
1500109b | 4515 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4516 | rsp.result = cpu_to_le16(result); |
4517 | ||
1500109b MM |
4518 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4519 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4520 | } |
4521 | ||
5b155ef9 | 4522 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4523 | { |
4524 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4525 | |
5b155ef9 | 4526 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4527 | |
5b155ef9 | 4528 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4529 | |
5b155ef9 | 4530 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4531 | cfm.result = cpu_to_le16(result); |
4532 | ||
5b155ef9 MM |
4533 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4534 | sizeof(cfm), &cfm); | |
4535 | ||
4536 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4537 | } | |
4538 | ||
4539 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4540 | { | |
4541 | struct l2cap_move_chan_cfm cfm; | |
4542 | ||
4543 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4544 | ||
4545 | cfm.icid = cpu_to_le16(icid); | |
4546 | cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED); | |
4547 | ||
4548 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4549 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4550 | } |
4551 | ||
4552 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4553 | u16 icid) |
8d5a04a1 MM |
4554 | { |
4555 | struct l2cap_move_chan_cfm_rsp rsp; | |
4556 | ||
ad0ac6ca | 4557 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4558 | |
4559 | rsp.icid = cpu_to_le16(icid); | |
4560 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4561 | } | |
4562 | ||
5f3847a4 MM |
4563 | static void __release_logical_link(struct l2cap_chan *chan) |
4564 | { | |
4565 | chan->hs_hchan = NULL; | |
4566 | chan->hs_hcon = NULL; | |
4567 | ||
4568 | /* Placeholder - release the logical link */ | |
4569 | } | |
4570 | ||
1500109b MM |
4571 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4572 | { | |
4573 | /* Logical link setup failed */ | |
4574 | if (chan->state != BT_CONNECTED) { | |
4575 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4576 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4577 | return; |
4578 | } | |
4579 | ||
4580 | switch (chan->move_role) { | |
4581 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4582 | l2cap_move_done(chan); | |
4583 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4584 | break; | |
4585 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4586 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4587 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4588 | /* Remote has only sent pending or | |
4589 | * success responses, clean up | |
4590 | */ | |
4591 | l2cap_move_done(chan); | |
4592 | } | |
4593 | ||
4594 | /* Other amp move states imply that the move | |
4595 | * has already aborted | |
4596 | */ | |
4597 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4598 | break; | |
4599 | } | |
4600 | } | |
4601 | ||
4602 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4603 | struct hci_chan *hchan) | |
4604 | { | |
4605 | struct l2cap_conf_rsp rsp; | |
1500109b | 4606 | |
336178a3 | 4607 | chan->hs_hchan = hchan; |
1500109b MM |
4608 | chan->hs_hcon->l2cap_data = chan->conn; |
4609 | ||
35ba9561 | 4610 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4611 | |
4612 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4613 | int err; |
1500109b MM |
4614 | |
4615 | set_default_fcs(chan); | |
4616 | ||
4617 | err = l2cap_ertm_init(chan); | |
4618 | if (err < 0) | |
5e4e3972 | 4619 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4620 | else |
4621 | l2cap_chan_ready(chan); | |
4622 | } | |
4623 | } | |
4624 | ||
4625 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4626 | struct hci_chan *hchan) | |
4627 | { | |
4628 | chan->hs_hcon = hchan->conn; | |
4629 | chan->hs_hcon->l2cap_data = chan->conn; | |
4630 | ||
4631 | BT_DBG("move_state %d", chan->move_state); | |
4632 | ||
4633 | switch (chan->move_state) { | |
4634 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4635 | /* Move confirm will be sent after a success | |
4636 | * response is received | |
4637 | */ | |
4638 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4639 | break; | |
4640 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4641 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4642 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4643 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4644 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4645 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4646 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4647 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4648 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4649 | } | |
4650 | break; | |
4651 | default: | |
4652 | /* Move was not in expected state, free the channel */ | |
4653 | __release_logical_link(chan); | |
4654 | ||
4655 | chan->move_state = L2CAP_MOVE_STABLE; | |
4656 | } | |
4657 | } | |
4658 | ||
4659 | /* Call with chan locked */ | |
27695fb4 AE |
4660 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4661 | u8 status) | |
5b155ef9 | 4662 | { |
1500109b MM |
4663 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4664 | ||
4665 | if (status) { | |
4666 | l2cap_logical_fail(chan); | |
4667 | __release_logical_link(chan); | |
4668 | return; | |
4669 | } | |
4670 | ||
4671 | if (chan->state != BT_CONNECTED) { | |
4672 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4673 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4674 | l2cap_logical_finish_create(chan, hchan); |
4675 | } else { | |
4676 | l2cap_logical_finish_move(chan, hchan); | |
4677 | } | |
5b155ef9 MM |
4678 | } |
4679 | ||
3f7a56c4 MM |
4680 | void l2cap_move_start(struct l2cap_chan *chan) |
4681 | { | |
4682 | BT_DBG("chan %p", chan); | |
4683 | ||
6ed971ca | 4684 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4685 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4686 | return; | |
4687 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4688 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4689 | /* Placeholder - start physical link setup */ | |
4690 | } else { | |
4691 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4692 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4693 | chan->move_id = 0; | |
4694 | l2cap_move_setup(chan); | |
4695 | l2cap_send_move_chan_req(chan, 0); | |
4696 | } | |
4697 | } | |
4698 | ||
8eb200bd MM |
4699 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4700 | u8 local_amp_id, u8 remote_amp_id) | |
4701 | { | |
62748ca1 AE |
4702 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4703 | local_amp_id, remote_amp_id); | |
4704 | ||
12d6cc60 AE |
4705 | chan->fcs = L2CAP_FCS_NONE; |
4706 | ||
62748ca1 AE |
4707 | /* Outgoing channel on AMP */ |
4708 | if (chan->state == BT_CONNECT) { | |
4709 | if (result == L2CAP_CR_SUCCESS) { | |
4710 | chan->local_amp_id = local_amp_id; | |
4711 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4712 | } else { | |
4713 | /* Revert to BR/EDR connect */ | |
4714 | l2cap_send_conn_req(chan); | |
4715 | } | |
4716 | ||
4717 | return; | |
4718 | } | |
4719 | ||
4720 | /* Incoming channel on AMP */ | |
4721 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4722 | struct l2cap_conn_rsp rsp; |
4723 | char buf[128]; | |
4724 | rsp.scid = cpu_to_le16(chan->dcid); | |
4725 | rsp.dcid = cpu_to_le16(chan->scid); | |
4726 | ||
8eb200bd MM |
4727 | if (result == L2CAP_CR_SUCCESS) { |
4728 | /* Send successful response */ | |
62cd50e2 AE |
4729 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS); |
4730 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4731 | } else { |
4732 | /* Send negative response */ | |
62cd50e2 AE |
4733 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
4734 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4735 | } |
4736 | ||
4737 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4738 | sizeof(rsp), &rsp); | |
4739 | ||
4740 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4741 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4742 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4743 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4744 | L2CAP_CONF_REQ, | |
4745 | l2cap_build_conf_req(chan, buf), buf); | |
4746 | chan->num_conf_req++; | |
4747 | } | |
8eb200bd MM |
4748 | } |
4749 | } | |
4750 | ||
4751 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4752 | u8 remote_amp_id) | |
4753 | { | |
4754 | l2cap_move_setup(chan); | |
4755 | chan->move_id = local_amp_id; | |
4756 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4757 | ||
4758 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4759 | } | |
4760 | ||
4761 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4762 | { | |
4763 | struct hci_chan *hchan = NULL; | |
4764 | ||
4765 | /* Placeholder - get hci_chan for logical link */ | |
4766 | ||
4767 | if (hchan) { | |
4768 | if (hchan->state == BT_CONNECTED) { | |
4769 | /* Logical link is ready to go */ | |
4770 | chan->hs_hcon = hchan->conn; | |
4771 | chan->hs_hcon->l2cap_data = chan->conn; | |
4772 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4773 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4774 | ||
4775 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4776 | } else { | |
4777 | /* Wait for logical link to be ready */ | |
4778 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4779 | } | |
4780 | } else { | |
4781 | /* Logical link not available */ | |
4782 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4783 | } | |
4784 | } | |
4785 | ||
4786 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4787 | { | |
4788 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4789 | u8 rsp_result; | |
4790 | if (result == -EINVAL) | |
4791 | rsp_result = L2CAP_MR_BAD_ID; | |
4792 | else | |
4793 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4794 | ||
4795 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4796 | } | |
4797 | ||
4798 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4799 | chan->move_state = L2CAP_MOVE_STABLE; | |
4800 | ||
4801 | /* Restart data transmission */ | |
4802 | l2cap_ertm_send(chan); | |
4803 | } | |
4804 | ||
a514b17f AE |
4805 | /* Invoke with locked chan */ |
4806 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4807 | { |
770bfefa | 4808 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4809 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4810 | |
8eb200bd MM |
4811 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4812 | chan, result, local_amp_id, remote_amp_id); | |
4813 | ||
8eb200bd MM |
4814 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4815 | l2cap_chan_unlock(chan); | |
4816 | return; | |
4817 | } | |
4818 | ||
4819 | if (chan->state != BT_CONNECTED) { | |
4820 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4821 | } else if (result != L2CAP_MR_SUCCESS) { | |
4822 | l2cap_do_move_cancel(chan, result); | |
4823 | } else { | |
4824 | switch (chan->move_role) { | |
4825 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4826 | l2cap_do_move_initiate(chan, local_amp_id, | |
4827 | remote_amp_id); | |
4828 | break; | |
4829 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4830 | l2cap_do_move_respond(chan, result); | |
4831 | break; | |
4832 | default: | |
4833 | l2cap_do_move_cancel(chan, result); | |
4834 | break; | |
4835 | } | |
4836 | } | |
8eb200bd MM |
4837 | } |
4838 | ||
8d5a04a1 | 4839 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4840 | struct l2cap_cmd_hdr *cmd, |
4841 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4842 | { |
4843 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4844 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4845 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4846 | u16 icid = 0; |
4847 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4848 | ||
4849 | if (cmd_len != sizeof(*req)) | |
4850 | return -EPROTO; | |
4851 | ||
4852 | icid = le16_to_cpu(req->icid); | |
4853 | ||
ad0ac6ca | 4854 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4855 | |
848566b3 | 4856 | if (!conn->hs_enabled) |
8d5a04a1 MM |
4857 | return -EINVAL; |
4858 | ||
02b0fbb9 MM |
4859 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4860 | if (!chan) { | |
1500109b MM |
4861 | rsp.icid = cpu_to_le16(icid); |
4862 | rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED); | |
4863 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, | |
4864 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4865 | return 0; |
4866 | } | |
4867 | ||
1500109b MM |
4868 | chan->ident = cmd->ident; |
4869 | ||
02b0fbb9 MM |
4870 | if (chan->scid < L2CAP_CID_DYN_START || |
4871 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4872 | (chan->mode != L2CAP_MODE_ERTM && | |
4873 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4874 | result = L2CAP_MR_NOT_ALLOWED; | |
4875 | goto send_move_response; | |
4876 | } | |
4877 | ||
4878 | if (chan->local_amp_id == req->dest_amp_id) { | |
4879 | result = L2CAP_MR_SAME_ID; | |
4880 | goto send_move_response; | |
4881 | } | |
4882 | ||
6ed971ca | 4883 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4884 | struct hci_dev *hdev; |
4885 | hdev = hci_dev_get(req->dest_amp_id); | |
4886 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4887 | !test_bit(HCI_UP, &hdev->flags)) { | |
4888 | if (hdev) | |
4889 | hci_dev_put(hdev); | |
4890 | ||
4891 | result = L2CAP_MR_BAD_ID; | |
4892 | goto send_move_response; | |
4893 | } | |
4894 | hci_dev_put(hdev); | |
4895 | } | |
4896 | ||
4897 | /* Detect a move collision. Only send a collision response | |
4898 | * if this side has "lost", otherwise proceed with the move. | |
4899 | * The winner has the larger bd_addr. | |
4900 | */ | |
4901 | if ((__chan_is_moving(chan) || | |
4902 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4903 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4904 | result = L2CAP_MR_COLLISION; |
4905 | goto send_move_response; | |
4906 | } | |
4907 | ||
02b0fbb9 MM |
4908 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4909 | l2cap_move_setup(chan); | |
4910 | chan->move_id = req->dest_amp_id; | |
4911 | icid = chan->dcid; | |
4912 | ||
6ed971ca | 4913 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4914 | /* Moving to BR/EDR */ |
4915 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4916 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4917 | result = L2CAP_MR_PEND; | |
4918 | } else { | |
4919 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4920 | result = L2CAP_MR_SUCCESS; | |
4921 | } | |
4922 | } else { | |
4923 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4924 | /* Placeholder - uncomment when amp functions are available */ | |
4925 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4926 | result = L2CAP_MR_PEND; | |
4927 | } | |
4928 | ||
4929 | send_move_response: | |
1500109b | 4930 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4931 | |
02b0fbb9 MM |
4932 | l2cap_chan_unlock(chan); |
4933 | ||
8d5a04a1 MM |
4934 | return 0; |
4935 | } | |
4936 | ||
5b155ef9 MM |
4937 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4938 | { | |
4939 | struct l2cap_chan *chan; | |
4940 | struct hci_chan *hchan = NULL; | |
4941 | ||
4942 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4943 | if (!chan) { | |
4944 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4945 | return; | |
4946 | } | |
4947 | ||
4948 | __clear_chan_timer(chan); | |
4949 | if (result == L2CAP_MR_PEND) | |
4950 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4951 | ||
4952 | switch (chan->move_state) { | |
4953 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4954 | /* Move confirm will be sent when logical link | |
4955 | * is complete. | |
4956 | */ | |
4957 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4958 | break; | |
4959 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4960 | if (result == L2CAP_MR_PEND) { | |
4961 | break; | |
4962 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4963 | &chan->conn_state)) { | |
4964 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4965 | } else { | |
4966 | /* Logical link is up or moving to BR/EDR, | |
4967 | * proceed with move | |
4968 | */ | |
4969 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4970 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4971 | } | |
4972 | break; | |
4973 | case L2CAP_MOVE_WAIT_RSP: | |
4974 | /* Moving to AMP */ | |
4975 | if (result == L2CAP_MR_SUCCESS) { | |
4976 | /* Remote is ready, send confirm immediately | |
4977 | * after logical link is ready | |
4978 | */ | |
4979 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4980 | } else { | |
4981 | /* Both logical link and move success | |
4982 | * are required to confirm | |
4983 | */ | |
4984 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
4985 | } | |
4986 | ||
4987 | /* Placeholder - get hci_chan for logical link */ | |
4988 | if (!hchan) { | |
4989 | /* Logical link not available */ | |
4990 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4991 | break; | |
4992 | } | |
4993 | ||
4994 | /* If the logical link is not yet connected, do not | |
4995 | * send confirmation. | |
4996 | */ | |
4997 | if (hchan->state != BT_CONNECTED) | |
4998 | break; | |
4999 | ||
5000 | /* Logical link is already ready to go */ | |
5001 | ||
5002 | chan->hs_hcon = hchan->conn; | |
5003 | chan->hs_hcon->l2cap_data = chan->conn; | |
5004 | ||
5005 | if (result == L2CAP_MR_SUCCESS) { | |
5006 | /* Can confirm now */ | |
5007 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5008 | } else { | |
5009 | /* Now only need move success | |
5010 | * to confirm | |
5011 | */ | |
5012 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
5013 | } | |
5014 | ||
5015 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
5016 | break; | |
5017 | default: | |
5018 | /* Any other amp move state means the move failed. */ | |
5019 | chan->move_id = chan->local_amp_id; | |
5020 | l2cap_move_done(chan); | |
5021 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5022 | } | |
5023 | ||
5024 | l2cap_chan_unlock(chan); | |
5025 | } | |
5026 | ||
5027 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5028 | u16 result) | |
5029 | { | |
5030 | struct l2cap_chan *chan; | |
5031 | ||
5032 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5033 | if (!chan) { | |
5034 | /* Could not locate channel, icid is best guess */ | |
5035 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5036 | return; | |
5037 | } | |
5038 | ||
5039 | __clear_chan_timer(chan); | |
5040 | ||
5041 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5042 | if (result == L2CAP_MR_COLLISION) { | |
5043 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5044 | } else { | |
5045 | /* Cleanup - cancel move */ | |
5046 | chan->move_id = chan->local_amp_id; | |
5047 | l2cap_move_done(chan); | |
5048 | } | |
5049 | } | |
5050 | ||
5051 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5052 | ||
5053 | l2cap_chan_unlock(chan); | |
5054 | } | |
5055 | ||
5056 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5057 | struct l2cap_cmd_hdr *cmd, | |
5058 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5059 | { |
5060 | struct l2cap_move_chan_rsp *rsp = data; | |
5061 | u16 icid, result; | |
5062 | ||
5063 | if (cmd_len != sizeof(*rsp)) | |
5064 | return -EPROTO; | |
5065 | ||
5066 | icid = le16_to_cpu(rsp->icid); | |
5067 | result = le16_to_cpu(rsp->result); | |
5068 | ||
ad0ac6ca | 5069 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5070 | |
5b155ef9 MM |
5071 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5072 | l2cap_move_continue(conn, icid, result); | |
5073 | else | |
5074 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5075 | |
5076 | return 0; | |
5077 | } | |
5078 | ||
5f3847a4 MM |
5079 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5080 | struct l2cap_cmd_hdr *cmd, | |
5081 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5082 | { |
5083 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5084 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5085 | u16 icid, result; |
5086 | ||
5087 | if (cmd_len != sizeof(*cfm)) | |
5088 | return -EPROTO; | |
5089 | ||
5090 | icid = le16_to_cpu(cfm->icid); | |
5091 | result = le16_to_cpu(cfm->result); | |
5092 | ||
ad0ac6ca | 5093 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5094 | |
5f3847a4 MM |
5095 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5096 | if (!chan) { | |
5097 | /* Spec requires a response even if the icid was not found */ | |
5098 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5099 | return 0; | |
5100 | } | |
5101 | ||
5102 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5103 | if (result == L2CAP_MC_CONFIRMED) { | |
5104 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5105 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5106 | __release_logical_link(chan); |
5107 | } else { | |
5108 | chan->move_id = chan->local_amp_id; | |
5109 | } | |
5110 | ||
5111 | l2cap_move_done(chan); | |
5112 | } | |
5113 | ||
8d5a04a1 MM |
5114 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5115 | ||
5f3847a4 MM |
5116 | l2cap_chan_unlock(chan); |
5117 | ||
8d5a04a1 MM |
5118 | return 0; |
5119 | } | |
5120 | ||
5121 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5122 | struct l2cap_cmd_hdr *cmd, |
5123 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5124 | { |
5125 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5126 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5127 | u16 icid; |
5128 | ||
5129 | if (cmd_len != sizeof(*rsp)) | |
5130 | return -EPROTO; | |
5131 | ||
5132 | icid = le16_to_cpu(rsp->icid); | |
5133 | ||
ad0ac6ca | 5134 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5135 | |
3fd71a0a MM |
5136 | chan = l2cap_get_chan_by_scid(conn, icid); |
5137 | if (!chan) | |
5138 | return 0; | |
5139 | ||
5140 | __clear_chan_timer(chan); | |
5141 | ||
5142 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5143 | chan->local_amp_id = chan->move_id; | |
5144 | ||
6ed971ca | 5145 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5146 | __release_logical_link(chan); |
5147 | ||
5148 | l2cap_move_done(chan); | |
5149 | } | |
5150 | ||
5151 | l2cap_chan_unlock(chan); | |
5152 | ||
8d5a04a1 MM |
5153 | return 0; |
5154 | } | |
5155 | ||
e2174ca4 | 5156 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
2d792818 | 5157 | u16 to_multiplier) |
de73115a CT |
5158 | { |
5159 | u16 max_latency; | |
5160 | ||
5161 | if (min > max || min < 6 || max > 3200) | |
5162 | return -EINVAL; | |
5163 | ||
5164 | if (to_multiplier < 10 || to_multiplier > 3200) | |
5165 | return -EINVAL; | |
5166 | ||
5167 | if (max >= to_multiplier * 8) | |
5168 | return -EINVAL; | |
5169 | ||
5170 | max_latency = (to_multiplier * 8 / max) - 1; | |
5171 | if (latency > 499 || latency > max_latency) | |
5172 | return -EINVAL; | |
5173 | ||
5174 | return 0; | |
5175 | } | |
5176 | ||
5177 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2d792818 | 5178 | struct l2cap_cmd_hdr *cmd, |
203e639e | 5179 | u16 cmd_len, u8 *data) |
de73115a CT |
5180 | { |
5181 | struct hci_conn *hcon = conn->hcon; | |
5182 | struct l2cap_conn_param_update_req *req; | |
5183 | struct l2cap_conn_param_update_rsp rsp; | |
203e639e | 5184 | u16 min, max, latency, to_multiplier; |
2ce603eb | 5185 | int err; |
de73115a CT |
5186 | |
5187 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
5188 | return -EINVAL; | |
5189 | ||
de73115a CT |
5190 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5191 | return -EPROTO; | |
5192 | ||
5193 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5194 | min = __le16_to_cpu(req->min); |
5195 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5196 | latency = __le16_to_cpu(req->latency); |
5197 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5198 | ||
5199 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5200 | min, max, latency, to_multiplier); |
de73115a CT |
5201 | |
5202 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
5203 | |
5204 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
5205 | if (err) | |
ac73498c | 5206 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5207 | else |
ac73498c | 5208 | rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5209 | |
5210 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5211 | sizeof(rsp), &rsp); |
de73115a | 5212 | |
2ce603eb CT |
5213 | if (!err) |
5214 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
5215 | ||
de73115a CT |
5216 | return 0; |
5217 | } | |
5218 | ||
f1496dee JH |
5219 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5220 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5221 | u8 *data) | |
5222 | { | |
5223 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; | |
5224 | u16 dcid, mtu, mps, credits, result; | |
5225 | struct l2cap_chan *chan; | |
5226 | int err; | |
5227 | ||
5228 | if (cmd_len < sizeof(*rsp)) | |
5229 | return -EPROTO; | |
5230 | ||
5231 | dcid = __le16_to_cpu(rsp->dcid); | |
5232 | mtu = __le16_to_cpu(rsp->mtu); | |
5233 | mps = __le16_to_cpu(rsp->mps); | |
5234 | credits = __le16_to_cpu(rsp->credits); | |
5235 | result = __le16_to_cpu(rsp->result); | |
5236 | ||
5237 | if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) | |
5238 | return -EPROTO; | |
5239 | ||
5240 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", | |
5241 | dcid, mtu, mps, credits, result); | |
5242 | ||
5243 | mutex_lock(&conn->chan_lock); | |
5244 | ||
5245 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5246 | if (!chan) { | |
5247 | err = -EBADSLT; | |
5248 | goto unlock; | |
5249 | } | |
5250 | ||
5251 | err = 0; | |
5252 | ||
5253 | l2cap_chan_lock(chan); | |
5254 | ||
5255 | switch (result) { | |
5256 | case L2CAP_CR_SUCCESS: | |
5257 | chan->ident = 0; | |
5258 | chan->dcid = dcid; | |
5259 | chan->omtu = mtu; | |
5260 | chan->remote_mps = mps; | |
0cd75f7e | 5261 | chan->tx_credits = credits; |
f1496dee JH |
5262 | l2cap_chan_ready(chan); |
5263 | break; | |
5264 | ||
5265 | default: | |
5266 | l2cap_chan_del(chan, ECONNREFUSED); | |
5267 | break; | |
5268 | } | |
5269 | ||
5270 | l2cap_chan_unlock(chan); | |
5271 | ||
5272 | unlock: | |
5273 | mutex_unlock(&conn->chan_lock); | |
5274 | ||
5275 | return err; | |
5276 | } | |
5277 | ||
3300d9a9 | 5278 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5279 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5280 | u8 *data) | |
3300d9a9 CT |
5281 | { |
5282 | int err = 0; | |
5283 | ||
5284 | switch (cmd->code) { | |
5285 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5286 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5287 | break; |
5288 | ||
5289 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5290 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5291 | break; |
5292 | ||
5293 | case L2CAP_CONN_RSP: | |
f5a2598d | 5294 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5295 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5296 | break; |
5297 | ||
5298 | case L2CAP_CONF_REQ: | |
5299 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5300 | break; | |
5301 | ||
5302 | case L2CAP_CONF_RSP: | |
9245e737 | 5303 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5304 | break; |
5305 | ||
5306 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5307 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5308 | break; |
5309 | ||
5310 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5311 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5312 | break; |
5313 | ||
5314 | case L2CAP_ECHO_REQ: | |
5315 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5316 | break; | |
5317 | ||
5318 | case L2CAP_ECHO_RSP: | |
5319 | break; | |
5320 | ||
5321 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5322 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5323 | break; |
5324 | ||
5325 | case L2CAP_INFO_RSP: | |
9245e737 | 5326 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5327 | break; |
5328 | ||
f94ff6ff MM |
5329 | case L2CAP_CREATE_CHAN_REQ: |
5330 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5331 | break; | |
5332 | ||
8d5a04a1 MM |
5333 | case L2CAP_MOVE_CHAN_REQ: |
5334 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5335 | break; | |
5336 | ||
5337 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5338 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5339 | break; |
5340 | ||
5341 | case L2CAP_MOVE_CHAN_CFM: | |
5342 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5343 | break; | |
5344 | ||
5345 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5346 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5347 | break; |
5348 | ||
3300d9a9 CT |
5349 | default: |
5350 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5351 | err = -EINVAL; | |
5352 | break; | |
5353 | } | |
5354 | ||
5355 | return err; | |
5356 | } | |
5357 | ||
27e2d4c8 JH |
5358 | static int l2cap_le_connect_req(struct l2cap_conn *conn, |
5359 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5360 | u8 *data) | |
5361 | { | |
5362 | struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; | |
5363 | struct l2cap_le_conn_rsp rsp; | |
5364 | struct l2cap_chan *chan, *pchan; | |
0cd75f7e | 5365 | u16 dcid, scid, credits, mtu, mps; |
27e2d4c8 JH |
5366 | __le16 psm; |
5367 | u8 result; | |
5368 | ||
5369 | if (cmd_len != sizeof(*req)) | |
5370 | return -EPROTO; | |
5371 | ||
5372 | scid = __le16_to_cpu(req->scid); | |
5373 | mtu = __le16_to_cpu(req->mtu); | |
5374 | mps = __le16_to_cpu(req->mps); | |
5375 | psm = req->psm; | |
5376 | dcid = 0; | |
0cd75f7e | 5377 | credits = 0; |
27e2d4c8 JH |
5378 | |
5379 | if (mtu < 23 || mps < 23) | |
5380 | return -EPROTO; | |
5381 | ||
5382 | BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), | |
5383 | scid, mtu, mps); | |
5384 | ||
5385 | /* Check if we have socket listening on psm */ | |
5386 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, | |
5387 | &conn->hcon->dst, LE_LINK); | |
5388 | if (!pchan) { | |
5389 | result = L2CAP_CR_BAD_PSM; | |
5390 | chan = NULL; | |
5391 | goto response; | |
5392 | } | |
5393 | ||
5394 | mutex_lock(&conn->chan_lock); | |
5395 | l2cap_chan_lock(pchan); | |
5396 | ||
5397 | if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) { | |
5398 | result = L2CAP_CR_AUTHENTICATION; | |
5399 | chan = NULL; | |
5400 | goto response_unlock; | |
5401 | } | |
5402 | ||
5403 | /* Check if we already have channel with that dcid */ | |
5404 | if (__l2cap_get_chan_by_dcid(conn, scid)) { | |
5405 | result = L2CAP_CR_NO_MEM; | |
5406 | chan = NULL; | |
5407 | goto response_unlock; | |
5408 | } | |
5409 | ||
5410 | chan = pchan->ops->new_connection(pchan); | |
5411 | if (!chan) { | |
5412 | result = L2CAP_CR_NO_MEM; | |
5413 | goto response_unlock; | |
5414 | } | |
5415 | ||
0ce43ce6 JH |
5416 | l2cap_le_flowctl_init(chan); |
5417 | ||
27e2d4c8 JH |
5418 | bacpy(&chan->src, &conn->hcon->src); |
5419 | bacpy(&chan->dst, &conn->hcon->dst); | |
5420 | chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type); | |
5421 | chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type); | |
5422 | chan->psm = psm; | |
5423 | chan->dcid = scid; | |
5424 | chan->omtu = mtu; | |
5425 | chan->remote_mps = mps; | |
0cd75f7e | 5426 | chan->tx_credits = __le16_to_cpu(req->credits); |
27e2d4c8 JH |
5427 | |
5428 | __l2cap_chan_add(conn, chan); | |
5429 | dcid = chan->scid; | |
0cd75f7e | 5430 | credits = chan->rx_credits; |
27e2d4c8 JH |
5431 | |
5432 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
5433 | ||
5434 | chan->ident = cmd->ident; | |
5435 | ||
5436 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { | |
5437 | l2cap_state_change(chan, BT_CONNECT2); | |
5438 | result = L2CAP_CR_PEND; | |
5439 | chan->ops->defer(chan); | |
5440 | } else { | |
5441 | l2cap_chan_ready(chan); | |
5442 | result = L2CAP_CR_SUCCESS; | |
5443 | } | |
5444 | ||
5445 | response_unlock: | |
5446 | l2cap_chan_unlock(pchan); | |
5447 | mutex_unlock(&conn->chan_lock); | |
5448 | ||
5449 | if (result == L2CAP_CR_PEND) | |
5450 | return 0; | |
5451 | ||
5452 | response: | |
5453 | if (chan) { | |
5454 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 5455 | rsp.mps = cpu_to_le16(chan->mps); |
27e2d4c8 JH |
5456 | } else { |
5457 | rsp.mtu = 0; | |
5458 | rsp.mps = 0; | |
5459 | } | |
5460 | ||
5461 | rsp.dcid = cpu_to_le16(dcid); | |
0cd75f7e | 5462 | rsp.credits = cpu_to_le16(credits); |
27e2d4c8 JH |
5463 | rsp.result = cpu_to_le16(result); |
5464 | ||
5465 | l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); | |
5466 | ||
5467 | return 0; | |
5468 | } | |
5469 | ||
fad5fc89 JH |
5470 | static inline int l2cap_le_credits(struct l2cap_conn *conn, |
5471 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5472 | u8 *data) | |
5473 | { | |
5474 | struct l2cap_le_credits *pkt; | |
5475 | struct l2cap_chan *chan; | |
5476 | u16 cid, credits; | |
5477 | ||
5478 | if (cmd_len != sizeof(*pkt)) | |
5479 | return -EPROTO; | |
5480 | ||
5481 | pkt = (struct l2cap_le_credits *) data; | |
5482 | cid = __le16_to_cpu(pkt->cid); | |
5483 | credits = __le16_to_cpu(pkt->credits); | |
5484 | ||
5485 | BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); | |
5486 | ||
5487 | chan = l2cap_get_chan_by_dcid(conn, cid); | |
5488 | if (!chan) | |
5489 | return -EBADSLT; | |
5490 | ||
5491 | chan->tx_credits += credits; | |
5492 | ||
5493 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
5494 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
5495 | chan->tx_credits--; | |
5496 | } | |
5497 | ||
5498 | if (chan->tx_credits) | |
5499 | chan->ops->resume(chan); | |
5500 | ||
5501 | l2cap_chan_unlock(chan); | |
5502 | ||
5503 | return 0; | |
5504 | } | |
5505 | ||
71fb4197 JH |
5506 | static inline int l2cap_le_command_rej(struct l2cap_conn *conn, |
5507 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5508 | u8 *data) | |
5509 | { | |
5510 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; | |
5511 | struct l2cap_chan *chan; | |
5512 | ||
5513 | if (cmd_len < sizeof(*rej)) | |
5514 | return -EPROTO; | |
5515 | ||
5516 | mutex_lock(&conn->chan_lock); | |
5517 | ||
5518 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5519 | if (!chan) | |
5520 | goto done; | |
5521 | ||
5522 | l2cap_chan_lock(chan); | |
5523 | l2cap_chan_del(chan, ECONNREFUSED); | |
5524 | l2cap_chan_unlock(chan); | |
5525 | ||
5526 | done: | |
5527 | mutex_unlock(&conn->chan_lock); | |
5528 | return 0; | |
5529 | } | |
5530 | ||
3300d9a9 | 5531 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
203e639e JH |
5532 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5533 | u8 *data) | |
3300d9a9 | 5534 | { |
b5ecba64 JH |
5535 | int err = 0; |
5536 | ||
3af8ace6 JH |
5537 | if (!enable_lecoc) { |
5538 | switch (cmd->code) { | |
5539 | case L2CAP_LE_CONN_REQ: | |
5540 | case L2CAP_LE_CONN_RSP: | |
5541 | case L2CAP_LE_CREDITS: | |
5542 | case L2CAP_DISCONN_REQ: | |
5543 | case L2CAP_DISCONN_RSP: | |
5544 | return -EINVAL; | |
5545 | } | |
5546 | } | |
5547 | ||
3300d9a9 CT |
5548 | switch (cmd->code) { |
5549 | case L2CAP_COMMAND_REJ: | |
71fb4197 | 5550 | l2cap_le_command_rej(conn, cmd, cmd_len, data); |
b5ecba64 | 5551 | break; |
3300d9a9 CT |
5552 | |
5553 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
b5ecba64 JH |
5554 | err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
5555 | break; | |
3300d9a9 CT |
5556 | |
5557 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
b5ecba64 | 5558 | break; |
3300d9a9 | 5559 | |
f1496dee JH |
5560 | case L2CAP_LE_CONN_RSP: |
5561 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5562 | break; |
f1496dee | 5563 | |
27e2d4c8 | 5564 | case L2CAP_LE_CONN_REQ: |
b5ecba64 JH |
5565 | err = l2cap_le_connect_req(conn, cmd, cmd_len, data); |
5566 | break; | |
27e2d4c8 | 5567 | |
fad5fc89 JH |
5568 | case L2CAP_LE_CREDITS: |
5569 | err = l2cap_le_credits(conn, cmd, cmd_len, data); | |
5570 | break; | |
5571 | ||
3defe01a | 5572 | case L2CAP_DISCONN_REQ: |
b5ecba64 JH |
5573 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
5574 | break; | |
3defe01a JH |
5575 | |
5576 | case L2CAP_DISCONN_RSP: | |
5577 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5578 | break; |
3defe01a | 5579 | |
3300d9a9 CT |
5580 | default: |
5581 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
b5ecba64 JH |
5582 | err = -EINVAL; |
5583 | break; | |
3300d9a9 | 5584 | } |
b5ecba64 JH |
5585 | |
5586 | return err; | |
3300d9a9 CT |
5587 | } |
5588 | ||
c5623556 JH |
5589 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5590 | struct sk_buff *skb) | |
5591 | { | |
69c4e4e8 | 5592 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5593 | struct l2cap_cmd_hdr *cmd; |
5594 | u16 len; | |
c5623556 JH |
5595 | int err; |
5596 | ||
69c4e4e8 | 5597 | if (hcon->type != LE_LINK) |
3b166295 | 5598 | goto drop; |
69c4e4e8 | 5599 | |
4f3e219d MH |
5600 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5601 | goto drop; | |
c5623556 | 5602 | |
4f3e219d MH |
5603 | cmd = (void *) skb->data; |
5604 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5605 | |
4f3e219d | 5606 | len = le16_to_cpu(cmd->len); |
c5623556 | 5607 | |
4f3e219d | 5608 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5609 | |
4f3e219d MH |
5610 | if (len != skb->len || !cmd->ident) { |
5611 | BT_DBG("corrupted command"); | |
5612 | goto drop; | |
5613 | } | |
c5623556 | 5614 | |
203e639e | 5615 | err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); |
4f3e219d MH |
5616 | if (err) { |
5617 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5618 | |
4f3e219d | 5619 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5620 | |
a521149a | 5621 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5622 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5623 | sizeof(rej), &rej); | |
c5623556 JH |
5624 | } |
5625 | ||
3b166295 | 5626 | drop: |
c5623556 JH |
5627 | kfree_skb(skb); |
5628 | } | |
5629 | ||
3300d9a9 | 5630 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5631 | struct sk_buff *skb) |
1da177e4 | 5632 | { |
69c4e4e8 | 5633 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5634 | u8 *data = skb->data; |
5635 | int len = skb->len; | |
5636 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5637 | int err; |
1da177e4 LT |
5638 | |
5639 | l2cap_raw_recv(conn, skb); | |
5640 | ||
69c4e4e8 | 5641 | if (hcon->type != ACL_LINK) |
3b166295 | 5642 | goto drop; |
69c4e4e8 | 5643 | |
1da177e4 | 5644 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5645 | u16 cmd_len; |
1da177e4 LT |
5646 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5647 | data += L2CAP_CMD_HDR_SIZE; | |
5648 | len -= L2CAP_CMD_HDR_SIZE; | |
5649 | ||
88219a0f | 5650 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5651 | |
2d792818 GP |
5652 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5653 | cmd.ident); | |
1da177e4 | 5654 | |
88219a0f | 5655 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5656 | BT_DBG("corrupted command"); |
5657 | break; | |
5658 | } | |
5659 | ||
c5623556 | 5660 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5661 | if (err) { |
e2fd318e | 5662 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5663 | |
5664 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5665 | |
a521149a | 5666 | rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5667 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5668 | sizeof(rej), &rej); | |
1da177e4 LT |
5669 | } |
5670 | ||
88219a0f AV |
5671 | data += cmd_len; |
5672 | len -= cmd_len; | |
1da177e4 LT |
5673 | } |
5674 | ||
3b166295 | 5675 | drop: |
1da177e4 LT |
5676 | kfree_skb(skb); |
5677 | } | |
5678 | ||
47d1ec61 | 5679 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5680 | { |
5681 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5682 | int hdr_size; |
5683 | ||
5684 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5685 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5686 | else | |
5687 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5688 | |
47d1ec61 | 5689 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5690 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5691 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5692 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5693 | ||
5694 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5695 | return -EBADMSG; |
fcc203c3 GP |
5696 | } |
5697 | return 0; | |
5698 | } | |
5699 | ||
6ea00485 | 5700 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5701 | { |
e31f7633 | 5702 | struct l2cap_ctrl control; |
d5392c8f | 5703 | |
e31f7633 | 5704 | BT_DBG("chan %p", chan); |
d5392c8f | 5705 | |
e31f7633 MM |
5706 | memset(&control, 0, sizeof(control)); |
5707 | control.sframe = 1; | |
5708 | control.final = 1; | |
5709 | control.reqseq = chan->buffer_seq; | |
5710 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5711 | |
e2ab4353 | 5712 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5713 | control.super = L2CAP_SUPER_RNR; |
5714 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5715 | } |
5716 | ||
e31f7633 MM |
5717 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5718 | chan->unacked_frames > 0) | |
5719 | __set_retrans_timer(chan); | |
d5392c8f | 5720 | |
e31f7633 | 5721 | /* Send pending iframes */ |
525cd185 | 5722 | l2cap_ertm_send(chan); |
d5392c8f | 5723 | |
e2ab4353 | 5724 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5725 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5726 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5727 | * send it now. | |
5728 | */ | |
5729 | control.super = L2CAP_SUPER_RR; | |
5730 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5731 | } |
5732 | } | |
5733 | ||
2d792818 GP |
5734 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5735 | struct sk_buff **last_frag) | |
18778a63 | 5736 | { |
84084a31 MM |
5737 | /* skb->len reflects data in skb as well as all fragments |
5738 | * skb->data_len reflects only data in fragments | |
5739 | */ | |
5740 | if (!skb_has_frag_list(skb)) | |
5741 | skb_shinfo(skb)->frag_list = new_frag; | |
5742 | ||
5743 | new_frag->next = NULL; | |
5744 | ||
5745 | (*last_frag)->next = new_frag; | |
5746 | *last_frag = new_frag; | |
5747 | ||
5748 | skb->len += new_frag->len; | |
5749 | skb->data_len += new_frag->len; | |
5750 | skb->truesize += new_frag->truesize; | |
5751 | } | |
5752 | ||
4b51dae9 MM |
5753 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5754 | struct l2cap_ctrl *control) | |
84084a31 MM |
5755 | { |
5756 | int err = -EINVAL; | |
18778a63 | 5757 | |
4b51dae9 | 5758 | switch (control->sar) { |
7e0ef6ee | 5759 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5760 | if (chan->sdu) |
5761 | break; | |
18778a63 | 5762 | |
80b98027 | 5763 | err = chan->ops->recv(chan, skb); |
84084a31 | 5764 | break; |
18778a63 | 5765 | |
7e0ef6ee | 5766 | case L2CAP_SAR_START: |
84084a31 MM |
5767 | if (chan->sdu) |
5768 | break; | |
18778a63 | 5769 | |
6f61fd47 | 5770 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5771 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5772 | |
84084a31 MM |
5773 | if (chan->sdu_len > chan->imtu) { |
5774 | err = -EMSGSIZE; | |
5775 | break; | |
5776 | } | |
1890d36b | 5777 | |
84084a31 MM |
5778 | if (skb->len >= chan->sdu_len) |
5779 | break; | |
18778a63 | 5780 | |
84084a31 MM |
5781 | chan->sdu = skb; |
5782 | chan->sdu_last_frag = skb; | |
18778a63 | 5783 | |
84084a31 MM |
5784 | skb = NULL; |
5785 | err = 0; | |
18778a63 GP |
5786 | break; |
5787 | ||
7e0ef6ee | 5788 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5789 | if (!chan->sdu) |
84084a31 | 5790 | break; |
18778a63 | 5791 | |
84084a31 MM |
5792 | append_skb_frag(chan->sdu, skb, |
5793 | &chan->sdu_last_frag); | |
5794 | skb = NULL; | |
18778a63 | 5795 | |
84084a31 MM |
5796 | if (chan->sdu->len >= chan->sdu_len) |
5797 | break; | |
4178ba46 | 5798 | |
84084a31 | 5799 | err = 0; |
18778a63 GP |
5800 | break; |
5801 | ||
7e0ef6ee | 5802 | case L2CAP_SAR_END: |
6f61fd47 | 5803 | if (!chan->sdu) |
84084a31 | 5804 | break; |
18778a63 | 5805 | |
84084a31 MM |
5806 | append_skb_frag(chan->sdu, skb, |
5807 | &chan->sdu_last_frag); | |
5808 | skb = NULL; | |
4178ba46 | 5809 | |
84084a31 MM |
5810 | if (chan->sdu->len != chan->sdu_len) |
5811 | break; | |
18778a63 | 5812 | |
80b98027 | 5813 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5814 | |
84084a31 MM |
5815 | if (!err) { |
5816 | /* Reassembly complete */ | |
5817 | chan->sdu = NULL; | |
5818 | chan->sdu_last_frag = NULL; | |
5819 | chan->sdu_len = 0; | |
1890d36b | 5820 | } |
18778a63 GP |
5821 | break; |
5822 | } | |
5823 | ||
84084a31 MM |
5824 | if (err) { |
5825 | kfree_skb(skb); | |
5826 | kfree_skb(chan->sdu); | |
5827 | chan->sdu = NULL; | |
5828 | chan->sdu_last_frag = NULL; | |
5829 | chan->sdu_len = 0; | |
5830 | } | |
18778a63 | 5831 | |
84084a31 | 5832 | return err; |
18778a63 GP |
5833 | } |
5834 | ||
32b32735 MM |
5835 | static int l2cap_resegment(struct l2cap_chan *chan) |
5836 | { | |
5837 | /* Placeholder */ | |
5838 | return 0; | |
5839 | } | |
5840 | ||
61aa4f5b | 5841 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5842 | { |
61aa4f5b | 5843 | u8 event; |
712132eb | 5844 | |
61aa4f5b MM |
5845 | if (chan->mode != L2CAP_MODE_ERTM) |
5846 | return; | |
712132eb | 5847 | |
61aa4f5b | 5848 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5849 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5850 | } |
5851 | ||
d2a7ac5d MM |
5852 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5853 | { | |
63838725 MM |
5854 | int err = 0; |
5855 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5856 | * until a gap is encountered. | |
5857 | */ | |
5858 | ||
5859 | BT_DBG("chan %p", chan); | |
5860 | ||
5861 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5862 | struct sk_buff *skb; | |
5863 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5864 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5865 | ||
5866 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5867 | ||
5868 | if (!skb) | |
5869 | break; | |
5870 | ||
5871 | skb_unlink(skb, &chan->srej_q); | |
5872 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
5873 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control); | |
5874 | if (err) | |
5875 | break; | |
5876 | } | |
5877 | ||
5878 | if (skb_queue_empty(&chan->srej_q)) { | |
5879 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5880 | l2cap_send_ack(chan); | |
5881 | } | |
5882 | ||
5883 | return err; | |
d2a7ac5d MM |
5884 | } |
5885 | ||
5886 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5887 | struct l2cap_ctrl *control) | |
5888 | { | |
f80842a8 MM |
5889 | struct sk_buff *skb; |
5890 | ||
5891 | BT_DBG("chan %p, control %p", chan, control); | |
5892 | ||
5893 | if (control->reqseq == chan->next_tx_seq) { | |
5894 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5895 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5896 | return; |
5897 | } | |
5898 | ||
5899 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5900 | ||
5901 | if (skb == NULL) { | |
5902 | BT_DBG("Seq %d not available for retransmission", | |
5903 | control->reqseq); | |
5904 | return; | |
5905 | } | |
5906 | ||
5907 | if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) { | |
5908 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5909 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5910 | return; |
5911 | } | |
5912 | ||
5913 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5914 | ||
5915 | if (control->poll) { | |
5916 | l2cap_pass_to_tx(chan, control); | |
5917 | ||
5918 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5919 | l2cap_retransmit(chan, control); | |
5920 | l2cap_ertm_send(chan); | |
5921 | ||
5922 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5923 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5924 | chan->srej_save_reqseq = control->reqseq; | |
5925 | } | |
5926 | } else { | |
5927 | l2cap_pass_to_tx_fbit(chan, control); | |
5928 | ||
5929 | if (control->final) { | |
5930 | if (chan->srej_save_reqseq != control->reqseq || | |
5931 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5932 | &chan->conn_state)) | |
5933 | l2cap_retransmit(chan, control); | |
5934 | } else { | |
5935 | l2cap_retransmit(chan, control); | |
5936 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5937 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5938 | chan->srej_save_reqseq = control->reqseq; | |
5939 | } | |
5940 | } | |
5941 | } | |
d2a7ac5d MM |
5942 | } |
5943 | ||
5944 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5945 | struct l2cap_ctrl *control) | |
5946 | { | |
fcd289df MM |
5947 | struct sk_buff *skb; |
5948 | ||
5949 | BT_DBG("chan %p, control %p", chan, control); | |
5950 | ||
5951 | if (control->reqseq == chan->next_tx_seq) { | |
5952 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5953 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5954 | return; |
5955 | } | |
5956 | ||
5957 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5958 | ||
5959 | if (chan->max_tx && skb && | |
5960 | bt_cb(skb)->control.retries >= chan->max_tx) { | |
5961 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); | |
5e4e3972 | 5962 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
5963 | return; |
5964 | } | |
5965 | ||
5966 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5967 | ||
5968 | l2cap_pass_to_tx(chan, control); | |
5969 | ||
5970 | if (control->final) { | |
5971 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
5972 | l2cap_retransmit_all(chan, control); | |
5973 | } else { | |
5974 | l2cap_retransmit_all(chan, control); | |
5975 | l2cap_ertm_send(chan); | |
5976 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
5977 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
5978 | } | |
d2a7ac5d MM |
5979 | } |
5980 | ||
4b51dae9 MM |
5981 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
5982 | { | |
5983 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
5984 | ||
5985 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
5986 | chan->expected_tx_seq); | |
5987 | ||
5988 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
5989 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 5990 | chan->tx_win) { |
4b51dae9 MM |
5991 | /* See notes below regarding "double poll" and |
5992 | * invalid packets. | |
5993 | */ | |
5994 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
5995 | BT_DBG("Invalid/Ignore - after SREJ"); | |
5996 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
5997 | } else { | |
5998 | BT_DBG("Invalid - in window after SREJ sent"); | |
5999 | return L2CAP_TXSEQ_INVALID; | |
6000 | } | |
6001 | } | |
6002 | ||
6003 | if (chan->srej_list.head == txseq) { | |
6004 | BT_DBG("Expected SREJ"); | |
6005 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
6006 | } | |
6007 | ||
6008 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
6009 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
6010 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
6011 | } | |
6012 | ||
6013 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
6014 | BT_DBG("Unexpected SREJ - not requested"); | |
6015 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
6016 | } | |
6017 | } | |
6018 | ||
6019 | if (chan->expected_tx_seq == txseq) { | |
6020 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
6021 | chan->tx_win) { | |
6022 | BT_DBG("Invalid - txseq outside tx window"); | |
6023 | return L2CAP_TXSEQ_INVALID; | |
6024 | } else { | |
6025 | BT_DBG("Expected"); | |
6026 | return L2CAP_TXSEQ_EXPECTED; | |
6027 | } | |
6028 | } | |
6029 | ||
6030 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 6031 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
6032 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
6033 | return L2CAP_TXSEQ_DUPLICATE; | |
6034 | } | |
6035 | ||
6036 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
6037 | /* A source of invalid packets is a "double poll" condition, | |
6038 | * where delays cause us to send multiple poll packets. If | |
6039 | * the remote stack receives and processes both polls, | |
6040 | * sequence numbers can wrap around in such a way that a | |
6041 | * resent frame has a sequence number that looks like new data | |
6042 | * with a sequence gap. This would trigger an erroneous SREJ | |
6043 | * request. | |
6044 | * | |
6045 | * Fortunately, this is impossible with a tx window that's | |
6046 | * less than half of the maximum sequence number, which allows | |
6047 | * invalid frames to be safely ignored. | |
6048 | * | |
6049 | * With tx window sizes greater than half of the tx window | |
6050 | * maximum, the frame is invalid and cannot be ignored. This | |
6051 | * causes a disconnect. | |
6052 | */ | |
6053 | ||
6054 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6055 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
6056 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6057 | } else { | |
6058 | BT_DBG("Invalid - txseq outside tx window"); | |
6059 | return L2CAP_TXSEQ_INVALID; | |
6060 | } | |
6061 | } else { | |
6062 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
6063 | return L2CAP_TXSEQ_UNEXPECTED; | |
6064 | } | |
6065 | } | |
6066 | ||
d2a7ac5d MM |
6067 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
6068 | struct l2cap_ctrl *control, | |
6069 | struct sk_buff *skb, u8 event) | |
6070 | { | |
6071 | int err = 0; | |
941247f9 | 6072 | bool skb_in_use = false; |
d2a7ac5d MM |
6073 | |
6074 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6075 | event); | |
6076 | ||
6077 | switch (event) { | |
6078 | case L2CAP_EV_RECV_IFRAME: | |
6079 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
6080 | case L2CAP_TXSEQ_EXPECTED: | |
6081 | l2cap_pass_to_tx(chan, control); | |
6082 | ||
6083 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6084 | BT_DBG("Busy, discarding expected seq %d", | |
6085 | control->txseq); | |
6086 | break; | |
6087 | } | |
6088 | ||
6089 | chan->expected_tx_seq = __next_seq(chan, | |
6090 | control->txseq); | |
6091 | ||
6092 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 6093 | skb_in_use = true; |
d2a7ac5d MM |
6094 | |
6095 | err = l2cap_reassemble_sdu(chan, skb, control); | |
6096 | if (err) | |
6097 | break; | |
6098 | ||
6099 | if (control->final) { | |
6100 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6101 | &chan->conn_state)) { | |
6102 | control->final = 0; | |
6103 | l2cap_retransmit_all(chan, control); | |
6104 | l2cap_ertm_send(chan); | |
6105 | } | |
6106 | } | |
6107 | ||
6108 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
6109 | l2cap_send_ack(chan); | |
6110 | break; | |
6111 | case L2CAP_TXSEQ_UNEXPECTED: | |
6112 | l2cap_pass_to_tx(chan, control); | |
6113 | ||
6114 | /* Can't issue SREJ frames in the local busy state. | |
6115 | * Drop this frame, it will be seen as missing | |
6116 | * when local busy is exited. | |
6117 | */ | |
6118 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6119 | BT_DBG("Busy, discarding unexpected seq %d", | |
6120 | control->txseq); | |
6121 | break; | |
6122 | } | |
6123 | ||
6124 | /* There was a gap in the sequence, so an SREJ | |
6125 | * must be sent for each missing frame. The | |
6126 | * current frame is stored for later use. | |
6127 | */ | |
6128 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6129 | skb_in_use = true; |
d2a7ac5d MM |
6130 | BT_DBG("Queued %p (queue len %d)", skb, |
6131 | skb_queue_len(&chan->srej_q)); | |
6132 | ||
6133 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
6134 | l2cap_seq_list_clear(&chan->srej_list); | |
6135 | l2cap_send_srej(chan, control->txseq); | |
6136 | ||
6137 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
6138 | break; | |
6139 | case L2CAP_TXSEQ_DUPLICATE: | |
6140 | l2cap_pass_to_tx(chan, control); | |
6141 | break; | |
6142 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6143 | break; | |
6144 | case L2CAP_TXSEQ_INVALID: | |
6145 | default: | |
5e4e3972 | 6146 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6147 | break; |
6148 | } | |
6149 | break; | |
6150 | case L2CAP_EV_RECV_RR: | |
6151 | l2cap_pass_to_tx(chan, control); | |
6152 | if (control->final) { | |
6153 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6154 | ||
e6a3ee6e MM |
6155 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
6156 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
6157 | control->final = 0; |
6158 | l2cap_retransmit_all(chan, control); | |
6159 | } | |
6160 | ||
6161 | l2cap_ertm_send(chan); | |
6162 | } else if (control->poll) { | |
6163 | l2cap_send_i_or_rr_or_rnr(chan); | |
6164 | } else { | |
6165 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6166 | &chan->conn_state) && | |
6167 | chan->unacked_frames) | |
6168 | __set_retrans_timer(chan); | |
6169 | ||
6170 | l2cap_ertm_send(chan); | |
6171 | } | |
6172 | break; | |
6173 | case L2CAP_EV_RECV_RNR: | |
6174 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6175 | l2cap_pass_to_tx(chan, control); | |
6176 | if (control && control->poll) { | |
6177 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6178 | l2cap_send_rr_or_rnr(chan, 0); | |
6179 | } | |
6180 | __clear_retrans_timer(chan); | |
6181 | l2cap_seq_list_clear(&chan->retrans_list); | |
6182 | break; | |
6183 | case L2CAP_EV_RECV_REJ: | |
6184 | l2cap_handle_rej(chan, control); | |
6185 | break; | |
6186 | case L2CAP_EV_RECV_SREJ: | |
6187 | l2cap_handle_srej(chan, control); | |
6188 | break; | |
6189 | default: | |
6190 | break; | |
6191 | } | |
6192 | ||
6193 | if (skb && !skb_in_use) { | |
6194 | BT_DBG("Freeing %p", skb); | |
6195 | kfree_skb(skb); | |
6196 | } | |
6197 | ||
6198 | return err; | |
6199 | } | |
6200 | ||
6201 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
6202 | struct l2cap_ctrl *control, | |
6203 | struct sk_buff *skb, u8 event) | |
6204 | { | |
6205 | int err = 0; | |
6206 | u16 txseq = control->txseq; | |
941247f9 | 6207 | bool skb_in_use = false; |
d2a7ac5d MM |
6208 | |
6209 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6210 | event); | |
6211 | ||
6212 | switch (event) { | |
6213 | case L2CAP_EV_RECV_IFRAME: | |
6214 | switch (l2cap_classify_txseq(chan, txseq)) { | |
6215 | case L2CAP_TXSEQ_EXPECTED: | |
6216 | /* Keep frame for reassembly later */ | |
6217 | l2cap_pass_to_tx(chan, control); | |
6218 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6219 | skb_in_use = true; |
d2a7ac5d MM |
6220 | BT_DBG("Queued %p (queue len %d)", skb, |
6221 | skb_queue_len(&chan->srej_q)); | |
6222 | ||
6223 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
6224 | break; | |
6225 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
6226 | l2cap_seq_list_pop(&chan->srej_list); | |
6227 | ||
6228 | l2cap_pass_to_tx(chan, control); | |
6229 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6230 | skb_in_use = true; |
d2a7ac5d MM |
6231 | BT_DBG("Queued %p (queue len %d)", skb, |
6232 | skb_queue_len(&chan->srej_q)); | |
6233 | ||
6234 | err = l2cap_rx_queued_iframes(chan); | |
6235 | if (err) | |
6236 | break; | |
6237 | ||
6238 | break; | |
6239 | case L2CAP_TXSEQ_UNEXPECTED: | |
6240 | /* Got a frame that can't be reassembled yet. | |
6241 | * Save it for later, and send SREJs to cover | |
6242 | * the missing frames. | |
6243 | */ | |
6244 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6245 | skb_in_use = true; |
d2a7ac5d MM |
6246 | BT_DBG("Queued %p (queue len %d)", skb, |
6247 | skb_queue_len(&chan->srej_q)); | |
6248 | ||
6249 | l2cap_pass_to_tx(chan, control); | |
6250 | l2cap_send_srej(chan, control->txseq); | |
6251 | break; | |
6252 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
6253 | /* This frame was requested with an SREJ, but | |
6254 | * some expected retransmitted frames are | |
6255 | * missing. Request retransmission of missing | |
6256 | * SREJ'd frames. | |
6257 | */ | |
6258 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6259 | skb_in_use = true; |
d2a7ac5d MM |
6260 | BT_DBG("Queued %p (queue len %d)", skb, |
6261 | skb_queue_len(&chan->srej_q)); | |
6262 | ||
6263 | l2cap_pass_to_tx(chan, control); | |
6264 | l2cap_send_srej_list(chan, control->txseq); | |
6265 | break; | |
6266 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
6267 | /* We've already queued this frame. Drop this copy. */ | |
6268 | l2cap_pass_to_tx(chan, control); | |
6269 | break; | |
6270 | case L2CAP_TXSEQ_DUPLICATE: | |
6271 | /* Expecting a later sequence number, so this frame | |
6272 | * was already received. Ignore it completely. | |
6273 | */ | |
6274 | break; | |
6275 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6276 | break; | |
6277 | case L2CAP_TXSEQ_INVALID: | |
6278 | default: | |
5e4e3972 | 6279 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6280 | break; |
6281 | } | |
6282 | break; | |
6283 | case L2CAP_EV_RECV_RR: | |
6284 | l2cap_pass_to_tx(chan, control); | |
6285 | if (control->final) { | |
6286 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6287 | ||
6288 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6289 | &chan->conn_state)) { | |
6290 | control->final = 0; | |
6291 | l2cap_retransmit_all(chan, control); | |
6292 | } | |
6293 | ||
6294 | l2cap_ertm_send(chan); | |
6295 | } else if (control->poll) { | |
6296 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6297 | &chan->conn_state) && | |
6298 | chan->unacked_frames) { | |
6299 | __set_retrans_timer(chan); | |
6300 | } | |
6301 | ||
6302 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6303 | l2cap_send_srej_tail(chan); | |
6304 | } else { | |
6305 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6306 | &chan->conn_state) && | |
6307 | chan->unacked_frames) | |
6308 | __set_retrans_timer(chan); | |
6309 | ||
6310 | l2cap_send_ack(chan); | |
6311 | } | |
6312 | break; | |
6313 | case L2CAP_EV_RECV_RNR: | |
6314 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6315 | l2cap_pass_to_tx(chan, control); | |
6316 | if (control->poll) { | |
6317 | l2cap_send_srej_tail(chan); | |
6318 | } else { | |
6319 | struct l2cap_ctrl rr_control; | |
6320 | memset(&rr_control, 0, sizeof(rr_control)); | |
6321 | rr_control.sframe = 1; | |
6322 | rr_control.super = L2CAP_SUPER_RR; | |
6323 | rr_control.reqseq = chan->buffer_seq; | |
6324 | l2cap_send_sframe(chan, &rr_control); | |
6325 | } | |
6326 | ||
6327 | break; | |
6328 | case L2CAP_EV_RECV_REJ: | |
6329 | l2cap_handle_rej(chan, control); | |
6330 | break; | |
6331 | case L2CAP_EV_RECV_SREJ: | |
6332 | l2cap_handle_srej(chan, control); | |
6333 | break; | |
6334 | } | |
6335 | ||
6336 | if (skb && !skb_in_use) { | |
6337 | BT_DBG("Freeing %p", skb); | |
6338 | kfree_skb(skb); | |
6339 | } | |
6340 | ||
6341 | return err; | |
6342 | } | |
6343 | ||
32b32735 MM |
6344 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6345 | { | |
6346 | BT_DBG("chan %p", chan); | |
6347 | ||
6348 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6349 | ||
6350 | if (chan->hs_hcon) | |
6351 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6352 | else | |
6353 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6354 | ||
6355 | return l2cap_resegment(chan); | |
6356 | } | |
6357 | ||
6358 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6359 | struct l2cap_ctrl *control, | |
6360 | struct sk_buff *skb, u8 event) | |
6361 | { | |
6362 | int err; | |
6363 | ||
6364 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6365 | event); | |
6366 | ||
6367 | if (!control->poll) | |
6368 | return -EPROTO; | |
6369 | ||
6370 | l2cap_process_reqseq(chan, control->reqseq); | |
6371 | ||
6372 | if (!skb_queue_empty(&chan->tx_q)) | |
6373 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6374 | else | |
6375 | chan->tx_send_head = NULL; | |
6376 | ||
6377 | /* Rewind next_tx_seq to the point expected | |
6378 | * by the receiver. | |
6379 | */ | |
6380 | chan->next_tx_seq = control->reqseq; | |
6381 | chan->unacked_frames = 0; | |
6382 | ||
6383 | err = l2cap_finish_move(chan); | |
6384 | if (err) | |
6385 | return err; | |
6386 | ||
6387 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6388 | l2cap_send_i_or_rr_or_rnr(chan); | |
6389 | ||
6390 | if (event == L2CAP_EV_RECV_IFRAME) | |
6391 | return -EPROTO; | |
6392 | ||
6393 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6394 | } | |
6395 | ||
6396 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6397 | struct l2cap_ctrl *control, | |
6398 | struct sk_buff *skb, u8 event) | |
6399 | { | |
6400 | int err; | |
6401 | ||
6402 | if (!control->final) | |
6403 | return -EPROTO; | |
6404 | ||
6405 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6406 | ||
6407 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6408 | l2cap_process_reqseq(chan, control->reqseq); | |
6409 | ||
6410 | if (!skb_queue_empty(&chan->tx_q)) | |
6411 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6412 | else | |
6413 | chan->tx_send_head = NULL; | |
6414 | ||
6415 | /* Rewind next_tx_seq to the point expected | |
6416 | * by the receiver. | |
6417 | */ | |
6418 | chan->next_tx_seq = control->reqseq; | |
6419 | chan->unacked_frames = 0; | |
6420 | ||
6421 | if (chan->hs_hcon) | |
6422 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6423 | else | |
6424 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6425 | ||
6426 | err = l2cap_resegment(chan); | |
6427 | ||
6428 | if (!err) | |
6429 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6430 | ||
6431 | return err; | |
6432 | } | |
6433 | ||
d2a7ac5d MM |
6434 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6435 | { | |
6436 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6437 | u16 unacked; | |
6438 | ||
6439 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6440 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6441 | } | |
6442 | ||
cec8ab6e MM |
6443 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6444 | struct sk_buff *skb, u8 event) | |
218bb9df | 6445 | { |
d2a7ac5d MM |
6446 | int err = 0; |
6447 | ||
6448 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6449 | control, skb, event, chan->rx_state); | |
6450 | ||
6451 | if (__valid_reqseq(chan, control->reqseq)) { | |
6452 | switch (chan->rx_state) { | |
6453 | case L2CAP_RX_STATE_RECV: | |
6454 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6455 | break; | |
6456 | case L2CAP_RX_STATE_SREJ_SENT: | |
6457 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6458 | event); | |
6459 | break; | |
32b32735 MM |
6460 | case L2CAP_RX_STATE_WAIT_P: |
6461 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6462 | break; | |
6463 | case L2CAP_RX_STATE_WAIT_F: | |
6464 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6465 | break; | |
d2a7ac5d MM |
6466 | default: |
6467 | /* shut it down */ | |
6468 | break; | |
6469 | } | |
6470 | } else { | |
6471 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6472 | control->reqseq, chan->next_tx_seq, | |
6473 | chan->expected_ack_seq); | |
5e4e3972 | 6474 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6475 | } |
6476 | ||
6477 | return err; | |
cec8ab6e MM |
6478 | } |
6479 | ||
6480 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6481 | struct sk_buff *skb) | |
6482 | { | |
4b51dae9 MM |
6483 | int err = 0; |
6484 | ||
6485 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6486 | chan->rx_state); | |
6487 | ||
6488 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6489 | L2CAP_TXSEQ_EXPECTED) { | |
6490 | l2cap_pass_to_tx(chan, control); | |
6491 | ||
6492 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6493 | __next_seq(chan, chan->buffer_seq)); | |
6494 | ||
6495 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6496 | ||
6497 | l2cap_reassemble_sdu(chan, skb, control); | |
6498 | } else { | |
6499 | if (chan->sdu) { | |
6500 | kfree_skb(chan->sdu); | |
6501 | chan->sdu = NULL; | |
6502 | } | |
6503 | chan->sdu_last_frag = NULL; | |
6504 | chan->sdu_len = 0; | |
6505 | ||
6506 | if (skb) { | |
6507 | BT_DBG("Freeing %p", skb); | |
6508 | kfree_skb(skb); | |
6509 | } | |
6510 | } | |
6511 | ||
6512 | chan->last_acked_seq = control->txseq; | |
6513 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6514 | ||
6515 | return err; | |
cec8ab6e MM |
6516 | } |
6517 | ||
6518 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6519 | { | |
6520 | struct l2cap_ctrl *control = &bt_cb(skb)->control; | |
6521 | u16 len; | |
6522 | u8 event; | |
218bb9df | 6523 | |
b76bbd66 MM |
6524 | __unpack_control(chan, skb); |
6525 | ||
218bb9df GP |
6526 | len = skb->len; |
6527 | ||
6528 | /* | |
6529 | * We can just drop the corrupted I-frame here. | |
6530 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6531 | * procedures and ask for retransmission. |
218bb9df | 6532 | */ |
47d1ec61 | 6533 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6534 | goto drop; |
6535 | ||
cec8ab6e | 6536 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6537 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6538 | |
47d1ec61 | 6539 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6540 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6541 | |
47d1ec61 | 6542 | if (len > chan->mps) { |
5e4e3972 | 6543 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6544 | goto drop; |
6545 | } | |
6546 | ||
cec8ab6e MM |
6547 | if (!control->sframe) { |
6548 | int err; | |
218bb9df | 6549 | |
cec8ab6e MM |
6550 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6551 | control->sar, control->reqseq, control->final, | |
6552 | control->txseq); | |
218bb9df | 6553 | |
cec8ab6e MM |
6554 | /* Validate F-bit - F=0 always valid, F=1 only |
6555 | * valid in TX WAIT_F | |
6556 | */ | |
6557 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6558 | goto drop; |
cec8ab6e MM |
6559 | |
6560 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6561 | event = L2CAP_EV_RECV_IFRAME; | |
6562 | err = l2cap_rx(chan, control, skb, event); | |
6563 | } else { | |
6564 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6565 | } |
6566 | ||
cec8ab6e | 6567 | if (err) |
5e4e3972 | 6568 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6569 | } else { |
cec8ab6e MM |
6570 | const u8 rx_func_to_event[4] = { |
6571 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6572 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6573 | }; | |
6574 | ||
6575 | /* Only I-frames are expected in streaming mode */ | |
6576 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6577 | goto drop; | |
6578 | ||
6579 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6580 | control->reqseq, control->final, control->poll, | |
6581 | control->super); | |
6582 | ||
218bb9df | 6583 | if (len != 0) { |
1bb166e6 | 6584 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6585 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6586 | goto drop; |
6587 | } | |
6588 | ||
cec8ab6e MM |
6589 | /* Validate F and P bits */ |
6590 | if (control->final && (control->poll || | |
6591 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6592 | goto drop; | |
6593 | ||
6594 | event = rx_func_to_event[control->super]; | |
6595 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6596 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6597 | } |
6598 | ||
6599 | return 0; | |
6600 | ||
6601 | drop: | |
6602 | kfree_skb(skb); | |
6603 | return 0; | |
6604 | } | |
6605 | ||
b1c325c2 JH |
6606 | static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) |
6607 | { | |
6608 | struct l2cap_conn *conn = chan->conn; | |
6609 | struct l2cap_le_credits pkt; | |
6610 | u16 return_credits; | |
6611 | ||
6612 | /* We return more credits to the sender only after the amount of | |
6613 | * credits falls below half of the initial amount. | |
6614 | */ | |
f15b8ecf | 6615 | if (chan->rx_credits >= (le_max_credits + 1) / 2) |
b1c325c2 JH |
6616 | return; |
6617 | ||
f15b8ecf | 6618 | return_credits = le_max_credits - chan->rx_credits; |
b1c325c2 JH |
6619 | |
6620 | BT_DBG("chan %p returning %u credits to sender", chan, return_credits); | |
6621 | ||
6622 | chan->rx_credits += return_credits; | |
6623 | ||
6624 | pkt.cid = cpu_to_le16(chan->scid); | |
6625 | pkt.credits = cpu_to_le16(return_credits); | |
6626 | ||
6627 | chan->ident = l2cap_get_ident(conn); | |
6628 | ||
6629 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); | |
6630 | } | |
6631 | ||
fad5fc89 JH |
6632 | static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
6633 | { | |
aac23bf6 JH |
6634 | int err; |
6635 | ||
6636 | if (!chan->rx_credits) { | |
6637 | BT_ERR("No credits to receive LE L2CAP data"); | |
fad5fc89 | 6638 | return -ENOBUFS; |
aac23bf6 | 6639 | } |
fad5fc89 | 6640 | |
aac23bf6 JH |
6641 | if (chan->imtu < skb->len) { |
6642 | BT_ERR("Too big LE L2CAP PDU"); | |
fad5fc89 | 6643 | return -ENOBUFS; |
aac23bf6 | 6644 | } |
fad5fc89 JH |
6645 | |
6646 | chan->rx_credits--; | |
6647 | BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); | |
6648 | ||
6649 | l2cap_chan_le_send_credits(chan); | |
6650 | ||
aac23bf6 JH |
6651 | err = 0; |
6652 | ||
6653 | if (!chan->sdu) { | |
6654 | u16 sdu_len; | |
6655 | ||
6656 | sdu_len = get_unaligned_le16(skb->data); | |
6657 | skb_pull(skb, L2CAP_SDULEN_SIZE); | |
6658 | ||
6659 | BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", | |
6660 | sdu_len, skb->len, chan->imtu); | |
6661 | ||
6662 | if (sdu_len > chan->imtu) { | |
6663 | BT_ERR("Too big LE L2CAP SDU length received"); | |
6664 | err = -EMSGSIZE; | |
6665 | goto failed; | |
6666 | } | |
6667 | ||
6668 | if (skb->len > sdu_len) { | |
6669 | BT_ERR("Too much LE L2CAP data received"); | |
6670 | err = -EINVAL; | |
6671 | goto failed; | |
6672 | } | |
6673 | ||
6674 | if (skb->len == sdu_len) | |
6675 | return chan->ops->recv(chan, skb); | |
6676 | ||
6677 | chan->sdu = skb; | |
6678 | chan->sdu_len = sdu_len; | |
6679 | chan->sdu_last_frag = skb; | |
6680 | ||
6681 | return 0; | |
6682 | } | |
6683 | ||
6684 | BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", | |
6685 | chan->sdu->len, skb->len, chan->sdu_len); | |
6686 | ||
6687 | if (chan->sdu->len + skb->len > chan->sdu_len) { | |
6688 | BT_ERR("Too much LE L2CAP data received"); | |
6689 | err = -EINVAL; | |
6690 | goto failed; | |
6691 | } | |
6692 | ||
6693 | append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); | |
6694 | skb = NULL; | |
6695 | ||
6696 | if (chan->sdu->len == chan->sdu_len) { | |
6697 | err = chan->ops->recv(chan, chan->sdu); | |
6698 | if (!err) { | |
6699 | chan->sdu = NULL; | |
6700 | chan->sdu_last_frag = NULL; | |
6701 | chan->sdu_len = 0; | |
6702 | } | |
6703 | } | |
6704 | ||
6705 | failed: | |
6706 | if (err) { | |
6707 | kfree_skb(skb); | |
6708 | kfree_skb(chan->sdu); | |
6709 | chan->sdu = NULL; | |
6710 | chan->sdu_last_frag = NULL; | |
6711 | chan->sdu_len = 0; | |
6712 | } | |
6713 | ||
6714 | /* We can't return an error here since we took care of the skb | |
6715 | * freeing internally. An error return would cause the caller to | |
6716 | * do a double-free of the skb. | |
6717 | */ | |
6718 | return 0; | |
fad5fc89 JH |
6719 | } |
6720 | ||
13ca56e0 AE |
6721 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6722 | struct sk_buff *skb) | |
1da177e4 | 6723 | { |
48454079 | 6724 | struct l2cap_chan *chan; |
1da177e4 | 6725 | |
baa7e1fa | 6726 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6727 | if (!chan) { |
97e8e89d AE |
6728 | if (cid == L2CAP_CID_A2MP) { |
6729 | chan = a2mp_channel_create(conn, skb); | |
6730 | if (!chan) { | |
6731 | kfree_skb(skb); | |
13ca56e0 | 6732 | return; |
97e8e89d AE |
6733 | } |
6734 | ||
6735 | l2cap_chan_lock(chan); | |
6736 | } else { | |
6737 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6738 | /* Drop packet and return */ | |
6739 | kfree_skb(skb); | |
13ca56e0 | 6740 | return; |
97e8e89d | 6741 | } |
1da177e4 LT |
6742 | } |
6743 | ||
49208c9c | 6744 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6745 | |
89bc500e | 6746 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6747 | goto drop; |
6748 | ||
0c1bc5c6 | 6749 | switch (chan->mode) { |
38319713 | 6750 | case L2CAP_MODE_LE_FLOWCTL: |
fad5fc89 JH |
6751 | if (l2cap_le_data_rcv(chan, skb) < 0) |
6752 | goto drop; | |
6753 | ||
6754 | goto done; | |
6755 | ||
1c2acffb GP |
6756 | case L2CAP_MODE_BASIC: |
6757 | /* If socket recv buffers overflows we drop data here | |
6758 | * which is *bad* because L2CAP has to be reliable. | |
6759 | * But we don't have any other choice. L2CAP doesn't | |
6760 | * provide flow control mechanism. */ | |
1da177e4 | 6761 | |
0c1bc5c6 | 6762 | if (chan->imtu < skb->len) |
1c2acffb | 6763 | goto drop; |
1da177e4 | 6764 | |
80b98027 | 6765 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6766 | goto done; |
6767 | break; | |
6768 | ||
6769 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6770 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6771 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6772 | goto done; |
6773 | ||
1c2acffb | 6774 | default: |
0c1bc5c6 | 6775 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6776 | break; |
6777 | } | |
1da177e4 LT |
6778 | |
6779 | drop: | |
6780 | kfree_skb(skb); | |
6781 | ||
6782 | done: | |
6be36555 | 6783 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6784 | } |
6785 | ||
84104b24 AE |
6786 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6787 | struct sk_buff *skb) | |
1da177e4 | 6788 | { |
ae4fd2d3 | 6789 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6790 | struct l2cap_chan *chan; |
1da177e4 | 6791 | |
ae4fd2d3 MH |
6792 | if (hcon->type != ACL_LINK) |
6793 | goto drop; | |
6794 | ||
bf20fd4e JH |
6795 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, |
6796 | ACL_LINK); | |
23691d75 | 6797 | if (!chan) |
1da177e4 LT |
6798 | goto drop; |
6799 | ||
5b4cedaa | 6800 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6801 | |
89bc500e | 6802 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6803 | goto drop; |
6804 | ||
e13e21dc | 6805 | if (chan->imtu < skb->len) |
1da177e4 LT |
6806 | goto drop; |
6807 | ||
2edf870d | 6808 | /* Store remote BD_ADDR and PSM for msg_name */ |
06ae3314 | 6809 | bacpy(&bt_cb(skb)->bdaddr, &hcon->dst); |
2edf870d MH |
6810 | bt_cb(skb)->psm = psm; |
6811 | ||
80b98027 | 6812 | if (!chan->ops->recv(chan, skb)) |
84104b24 | 6813 | return; |
1da177e4 LT |
6814 | |
6815 | drop: | |
6816 | kfree_skb(skb); | |
1da177e4 LT |
6817 | } |
6818 | ||
72f78356 | 6819 | static void l2cap_att_channel(struct l2cap_conn *conn, |
6810fca7 | 6820 | struct sk_buff *skb) |
9f69bda6 | 6821 | { |
b99707d7 | 6822 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6823 | struct l2cap_chan *chan; |
9f69bda6 | 6824 | |
b99707d7 MH |
6825 | if (hcon->type != LE_LINK) |
6826 | goto drop; | |
6827 | ||
af1c0134 | 6828 | chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT, |
06ae3314 | 6829 | &hcon->src, &hcon->dst); |
23691d75 | 6830 | if (!chan) |
9f69bda6 GP |
6831 | goto drop; |
6832 | ||
5b4cedaa | 6833 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 6834 | |
cc8dba2b MH |
6835 | if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type)) |
6836 | goto drop; | |
6837 | ||
e13e21dc | 6838 | if (chan->imtu < skb->len) |
9f69bda6 GP |
6839 | goto drop; |
6840 | ||
80b98027 | 6841 | if (!chan->ops->recv(chan, skb)) |
6810fca7 | 6842 | return; |
9f69bda6 GP |
6843 | |
6844 | drop: | |
6845 | kfree_skb(skb); | |
9f69bda6 GP |
6846 | } |
6847 | ||
1da177e4 LT |
6848 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
6849 | { | |
6850 | struct l2cap_hdr *lh = (void *) skb->data; | |
61a939c6 | 6851 | struct hci_conn *hcon = conn->hcon; |
8e036fc3 AV |
6852 | u16 cid, len; |
6853 | __le16 psm; | |
1da177e4 | 6854 | |
61a939c6 JH |
6855 | if (hcon->state != BT_CONNECTED) { |
6856 | BT_DBG("queueing pending rx skb"); | |
6857 | skb_queue_tail(&conn->pending_rx, skb); | |
6858 | return; | |
6859 | } | |
6860 | ||
1da177e4 LT |
6861 | skb_pull(skb, L2CAP_HDR_SIZE); |
6862 | cid = __le16_to_cpu(lh->cid); | |
6863 | len = __le16_to_cpu(lh->len); | |
6864 | ||
1c2acffb GP |
6865 | if (len != skb->len) { |
6866 | kfree_skb(skb); | |
6867 | return; | |
6868 | } | |
6869 | ||
1da177e4 LT |
6870 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6871 | ||
6872 | switch (cid) { | |
8db4dc46 | 6873 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6874 | l2cap_sig_channel(conn, skb); |
6875 | break; | |
6876 | ||
8db4dc46 | 6877 | case L2CAP_CID_CONN_LESS: |
097db76c | 6878 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6879 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6880 | l2cap_conless_channel(conn, psm, skb); |
6881 | break; | |
6882 | ||
073d1cf3 | 6883 | case L2CAP_CID_ATT: |
72f78356 | 6884 | l2cap_att_channel(conn, skb); |
9f69bda6 GP |
6885 | break; |
6886 | ||
a2877629 MH |
6887 | case L2CAP_CID_LE_SIGNALING: |
6888 | l2cap_le_sig_channel(conn, skb); | |
6889 | break; | |
6890 | ||
b501d6a1 AB |
6891 | case L2CAP_CID_SMP: |
6892 | if (smp_sig_channel(conn, skb)) | |
6893 | l2cap_conn_del(conn->hcon, EACCES); | |
6894 | break; | |
6895 | ||
18722c24 JR |
6896 | case L2CAP_FC_6LOWPAN: |
6897 | bt_6lowpan_recv(conn, skb); | |
6898 | break; | |
6899 | ||
1da177e4 LT |
6900 | default: |
6901 | l2cap_data_channel(conn, cid, skb); | |
6902 | break; | |
6903 | } | |
6904 | } | |
6905 | ||
61a939c6 JH |
6906 | static void process_pending_rx(struct work_struct *work) |
6907 | { | |
6908 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, | |
6909 | pending_rx_work); | |
6910 | struct sk_buff *skb; | |
6911 | ||
6912 | BT_DBG(""); | |
6913 | ||
6914 | while ((skb = skb_dequeue(&conn->pending_rx))) | |
6915 | l2cap_recv_frame(conn, skb); | |
6916 | } | |
6917 | ||
162b49e7 JH |
6918 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
6919 | { | |
6920 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6921 | struct hci_chan *hchan; | |
6922 | ||
6923 | if (conn) | |
6924 | return conn; | |
6925 | ||
6926 | hchan = hci_chan_create(hcon); | |
6927 | if (!hchan) | |
6928 | return NULL; | |
6929 | ||
6930 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL); | |
6931 | if (!conn) { | |
6932 | hci_chan_del(hchan); | |
6933 | return NULL; | |
6934 | } | |
6935 | ||
6936 | kref_init(&conn->ref); | |
6937 | hcon->l2cap_data = conn; | |
6938 | conn->hcon = hcon; | |
6939 | hci_conn_get(conn->hcon); | |
6940 | conn->hchan = hchan; | |
6941 | ||
6942 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); | |
6943 | ||
6944 | switch (hcon->type) { | |
6945 | case LE_LINK: | |
6946 | if (hcon->hdev->le_mtu) { | |
6947 | conn->mtu = hcon->hdev->le_mtu; | |
6948 | break; | |
6949 | } | |
6950 | /* fall through */ | |
6951 | default: | |
6952 | conn->mtu = hcon->hdev->acl_mtu; | |
6953 | break; | |
6954 | } | |
6955 | ||
6956 | conn->feat_mask = 0; | |
6957 | ||
6958 | if (hcon->type == ACL_LINK) | |
6959 | conn->hs_enabled = test_bit(HCI_HS_ENABLED, | |
6960 | &hcon->hdev->dev_flags); | |
6961 | ||
6962 | spin_lock_init(&conn->lock); | |
6963 | mutex_init(&conn->chan_lock); | |
6964 | ||
6965 | INIT_LIST_HEAD(&conn->chan_l); | |
6966 | INIT_LIST_HEAD(&conn->users); | |
6967 | ||
6968 | if (hcon->type == LE_LINK) | |
6969 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); | |
6970 | else | |
6971 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); | |
6972 | ||
61a939c6 JH |
6973 | skb_queue_head_init(&conn->pending_rx); |
6974 | INIT_WORK(&conn->pending_rx_work, process_pending_rx); | |
6975 | ||
162b49e7 JH |
6976 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
6977 | ||
6978 | return conn; | |
6979 | } | |
6980 | ||
6981 | static bool is_valid_psm(u16 psm, u8 dst_type) { | |
6982 | if (!psm) | |
6983 | return false; | |
6984 | ||
6985 | if (bdaddr_type_is_le(dst_type)) | |
6986 | return (psm <= 0x00ff); | |
6987 | ||
6988 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
6989 | return ((psm & 0x0101) == 0x0001); | |
6990 | } | |
6991 | ||
6992 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, | |
6993 | bdaddr_t *dst, u8 dst_type) | |
6994 | { | |
6995 | struct l2cap_conn *conn; | |
6996 | struct hci_conn *hcon; | |
6997 | struct hci_dev *hdev; | |
6998 | __u8 auth_type; | |
6999 | int err; | |
7000 | ||
7001 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, | |
7002 | dst_type, __le16_to_cpu(psm)); | |
7003 | ||
7004 | hdev = hci_get_route(dst, &chan->src); | |
7005 | if (!hdev) | |
7006 | return -EHOSTUNREACH; | |
7007 | ||
7008 | hci_dev_lock(hdev); | |
7009 | ||
7010 | l2cap_chan_lock(chan); | |
7011 | ||
7012 | if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && | |
7013 | chan->chan_type != L2CAP_CHAN_RAW) { | |
7014 | err = -EINVAL; | |
7015 | goto done; | |
7016 | } | |
7017 | ||
21626e62 JH |
7018 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { |
7019 | err = -EINVAL; | |
7020 | goto done; | |
7021 | } | |
7022 | ||
7023 | if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { | |
162b49e7 JH |
7024 | err = -EINVAL; |
7025 | goto done; | |
7026 | } | |
7027 | ||
7028 | switch (chan->mode) { | |
7029 | case L2CAP_MODE_BASIC: | |
7030 | break; | |
7031 | case L2CAP_MODE_LE_FLOWCTL: | |
7032 | l2cap_le_flowctl_init(chan); | |
7033 | break; | |
7034 | case L2CAP_MODE_ERTM: | |
7035 | case L2CAP_MODE_STREAMING: | |
7036 | if (!disable_ertm) | |
7037 | break; | |
7038 | /* fall through */ | |
7039 | default: | |
7040 | err = -ENOTSUPP; | |
7041 | goto done; | |
7042 | } | |
7043 | ||
7044 | switch (chan->state) { | |
7045 | case BT_CONNECT: | |
7046 | case BT_CONNECT2: | |
7047 | case BT_CONFIG: | |
7048 | /* Already connecting */ | |
7049 | err = 0; | |
7050 | goto done; | |
7051 | ||
7052 | case BT_CONNECTED: | |
7053 | /* Already connected */ | |
7054 | err = -EISCONN; | |
7055 | goto done; | |
7056 | ||
7057 | case BT_OPEN: | |
7058 | case BT_BOUND: | |
7059 | /* Can connect */ | |
7060 | break; | |
7061 | ||
7062 | default: | |
7063 | err = -EBADFD; | |
7064 | goto done; | |
7065 | } | |
7066 | ||
7067 | /* Set destination address and psm */ | |
7068 | bacpy(&chan->dst, dst); | |
7069 | chan->dst_type = dst_type; | |
7070 | ||
7071 | chan->psm = psm; | |
7072 | chan->dcid = cid; | |
7073 | ||
7074 | auth_type = l2cap_get_auth_type(chan); | |
7075 | ||
7076 | if (bdaddr_type_is_le(dst_type)) | |
7077 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, | |
7078 | chan->sec_level, auth_type); | |
7079 | else | |
7080 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, | |
7081 | chan->sec_level, auth_type); | |
7082 | ||
7083 | if (IS_ERR(hcon)) { | |
7084 | err = PTR_ERR(hcon); | |
7085 | goto done; | |
7086 | } | |
7087 | ||
7088 | conn = l2cap_conn_add(hcon); | |
7089 | if (!conn) { | |
7090 | hci_conn_drop(hcon); | |
7091 | err = -ENOMEM; | |
7092 | goto done; | |
7093 | } | |
7094 | ||
7095 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { | |
7096 | hci_conn_drop(hcon); | |
7097 | err = -EBUSY; | |
7098 | goto done; | |
7099 | } | |
7100 | ||
7101 | /* Update source addr of the socket */ | |
7102 | bacpy(&chan->src, &hcon->src); | |
7103 | chan->src_type = bdaddr_type(hcon, hcon->src_type); | |
7104 | ||
7105 | l2cap_chan_unlock(chan); | |
7106 | l2cap_chan_add(conn, chan); | |
7107 | l2cap_chan_lock(chan); | |
7108 | ||
7109 | /* l2cap_chan_add takes its own ref so we can drop this one */ | |
7110 | hci_conn_drop(hcon); | |
7111 | ||
7112 | l2cap_state_change(chan, BT_CONNECT); | |
7113 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
7114 | ||
7115 | if (hcon->state == BT_CONNECTED) { | |
7116 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { | |
7117 | __clear_chan_timer(chan); | |
7118 | if (l2cap_chan_check_security(chan)) | |
7119 | l2cap_state_change(chan, BT_CONNECTED); | |
7120 | } else | |
7121 | l2cap_do_start(chan); | |
7122 | } | |
7123 | ||
7124 | err = 0; | |
7125 | ||
7126 | done: | |
7127 | l2cap_chan_unlock(chan); | |
7128 | hci_dev_unlock(hdev); | |
7129 | hci_dev_put(hdev); | |
7130 | return err; | |
7131 | } | |
7132 | ||
1da177e4 LT |
7133 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
7134 | ||
686ebf28 | 7135 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
7136 | { |
7137 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 7138 | struct l2cap_chan *c; |
1da177e4 | 7139 | |
6ed93dc6 | 7140 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
7141 | |
7142 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
7143 | read_lock(&chan_list_lock); |
7144 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 7145 | if (c->state != BT_LISTEN) |
1da177e4 LT |
7146 | continue; |
7147 | ||
7eafc59e | 7148 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 7149 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 7150 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 7151 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 7152 | exact++; |
7eafc59e | 7153 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 7154 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 7155 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
7156 | lm2 |= HCI_LM_MASTER; |
7157 | } | |
1da177e4 | 7158 | } |
23691d75 | 7159 | read_unlock(&chan_list_lock); |
1da177e4 LT |
7160 | |
7161 | return exact ? lm1 : lm2; | |
7162 | } | |
7163 | ||
9e664631 | 7164 | void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 7165 | { |
0139418c MH |
7166 | struct l2cap_conn *conn; |
7167 | ||
6ed93dc6 | 7168 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 7169 | |
1da177e4 | 7170 | if (!status) { |
baf43251 | 7171 | conn = l2cap_conn_add(hcon); |
1da177e4 LT |
7172 | if (conn) |
7173 | l2cap_conn_ready(conn); | |
ba6fc317 | 7174 | } else { |
e175072f | 7175 | l2cap_conn_del(hcon, bt_to_errno(status)); |
ba6fc317 | 7176 | } |
1da177e4 LT |
7177 | } |
7178 | ||
686ebf28 | 7179 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
7180 | { |
7181 | struct l2cap_conn *conn = hcon->l2cap_data; | |
7182 | ||
7183 | BT_DBG("hcon %p", hcon); | |
7184 | ||
686ebf28 | 7185 | if (!conn) |
9f5a0d7b | 7186 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
7187 | return conn->disc_reason; |
7188 | } | |
7189 | ||
9e664631 | 7190 | void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
7191 | { |
7192 | BT_DBG("hcon %p reason %d", hcon, reason); | |
7193 | ||
18722c24 JR |
7194 | bt_6lowpan_del_conn(hcon->l2cap_data); |
7195 | ||
e175072f | 7196 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
7197 | } |
7198 | ||
4343478f | 7199 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 7200 | { |
715ec005 | 7201 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
7202 | return; |
7203 | ||
f62e4323 | 7204 | if (encrypt == 0x00) { |
4343478f | 7205 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 7206 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
7d513e92 MH |
7207 | } else if (chan->sec_level == BT_SECURITY_HIGH || |
7208 | chan->sec_level == BT_SECURITY_FIPS) | |
0f852724 | 7209 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 7210 | } else { |
4343478f | 7211 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 7212 | __clear_chan_timer(chan); |
f62e4323 MH |
7213 | } |
7214 | } | |
7215 | ||
686ebf28 | 7216 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 7217 | { |
0139418c | 7218 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 7219 | struct l2cap_chan *chan; |
1da177e4 | 7220 | |
0139418c | 7221 | if (!conn) |
1da177e4 | 7222 | return 0; |
0139418c | 7223 | |
89d8b407 | 7224 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 7225 | |
160dc6ac | 7226 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
7227 | if (!status && encrypt) |
7228 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 7229 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
7230 | } |
7231 | ||
3df91ea2 | 7232 | mutex_lock(&conn->chan_lock); |
1da177e4 | 7233 | |
3df91ea2 | 7234 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 7235 | l2cap_chan_lock(chan); |
1da177e4 | 7236 | |
89d8b407 AE |
7237 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
7238 | state_to_string(chan->state)); | |
f1cb9af5 | 7239 | |
2338a7e0 | 7240 | if (chan->scid == L2CAP_CID_A2MP) { |
78eb2f98 AE |
7241 | l2cap_chan_unlock(chan); |
7242 | continue; | |
7243 | } | |
7244 | ||
073d1cf3 | 7245 | if (chan->scid == L2CAP_CID_ATT) { |
f1cb9af5 VCG |
7246 | if (!status && encrypt) { |
7247 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 7248 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
7249 | } |
7250 | ||
6be36555 | 7251 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
7252 | continue; |
7253 | } | |
7254 | ||
96eff46e | 7255 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 7256 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
7257 | continue; |
7258 | } | |
7259 | ||
89bc500e | 7260 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 7261 | chan->state == BT_CONFIG)) { |
d97c899b | 7262 | chan->ops->resume(chan); |
4343478f | 7263 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 7264 | l2cap_chan_unlock(chan); |
9719f8af MH |
7265 | continue; |
7266 | } | |
7267 | ||
89bc500e | 7268 | if (chan->state == BT_CONNECT) { |
6d3c15da | 7269 | if (!status) |
93c3e8f5 | 7270 | l2cap_start_connection(chan); |
6d3c15da | 7271 | else |
ba13ccd9 | 7272 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
89bc500e | 7273 | } else if (chan->state == BT_CONNECT2) { |
b1235d79 | 7274 | struct l2cap_conn_rsp rsp; |
df3c3931 | 7275 | __u16 res, stat; |
1da177e4 | 7276 | |
b1235d79 | 7277 | if (!status) { |
bdc25783 | 7278 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
7279 | res = L2CAP_CR_PEND; |
7280 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 7281 | chan->ops->defer(chan); |
df3c3931 | 7282 | } else { |
acdcabf5 | 7283 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
7284 | res = L2CAP_CR_SUCCESS; |
7285 | stat = L2CAP_CS_NO_INFO; | |
7286 | } | |
b1235d79 | 7287 | } else { |
acdcabf5 | 7288 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 7289 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
7290 | res = L2CAP_CR_SEC_BLOCK; |
7291 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
7292 | } |
7293 | ||
fe4128e0 GP |
7294 | rsp.scid = cpu_to_le16(chan->dcid); |
7295 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
7296 | rsp.result = cpu_to_le16(res); |
7297 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 7298 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 7299 | sizeof(rsp), &rsp); |
2d369359 MM |
7300 | |
7301 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
7302 | res == L2CAP_CR_SUCCESS) { | |
7303 | char buf[128]; | |
7304 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
7305 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
7306 | L2CAP_CONF_REQ, | |
7307 | l2cap_build_conf_req(chan, buf), | |
7308 | buf); | |
7309 | chan->num_conf_req++; | |
7310 | } | |
b1235d79 | 7311 | } |
1da177e4 | 7312 | |
6be36555 | 7313 | l2cap_chan_unlock(chan); |
1da177e4 LT |
7314 | } |
7315 | ||
3df91ea2 | 7316 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 7317 | |
1da177e4 LT |
7318 | return 0; |
7319 | } | |
7320 | ||
686ebf28 | 7321 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
7322 | { |
7323 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
7324 | struct l2cap_hdr *hdr; |
7325 | int len; | |
1da177e4 | 7326 | |
1d13a254 AE |
7327 | /* For AMP controller do not create l2cap conn */ |
7328 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
7329 | goto drop; | |
1da177e4 | 7330 | |
5a08ecce | 7331 | if (!conn) |
baf43251 | 7332 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
7333 | |
7334 | if (!conn) | |
1da177e4 LT |
7335 | goto drop; |
7336 | ||
7337 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
7338 | ||
d73a0988 AE |
7339 | switch (flags) { |
7340 | case ACL_START: | |
7341 | case ACL_START_NO_FLUSH: | |
7342 | case ACL_COMPLETE: | |
1da177e4 LT |
7343 | if (conn->rx_len) { |
7344 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
7345 | kfree_skb(conn->rx_skb); | |
7346 | conn->rx_skb = NULL; | |
7347 | conn->rx_len = 0; | |
7348 | l2cap_conn_unreliable(conn, ECOMM); | |
7349 | } | |
7350 | ||
aae7fe22 AE |
7351 | /* Start fragment always begin with Basic L2CAP header */ |
7352 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
7353 | BT_ERR("Frame is too short (len %d)", skb->len); |
7354 | l2cap_conn_unreliable(conn, ECOMM); | |
7355 | goto drop; | |
7356 | } | |
7357 | ||
7358 | hdr = (struct l2cap_hdr *) skb->data; | |
7359 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
7360 | ||
7361 | if (len == skb->len) { | |
7362 | /* Complete frame received */ | |
7363 | l2cap_recv_frame(conn, skb); | |
7364 | return 0; | |
7365 | } | |
7366 | ||
7367 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
7368 | ||
7369 | if (skb->len > len) { | |
7370 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 7371 | skb->len, len); |
1da177e4 LT |
7372 | l2cap_conn_unreliable(conn, ECOMM); |
7373 | goto drop; | |
7374 | } | |
7375 | ||
7376 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 7377 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 7378 | if (!conn->rx_skb) |
1da177e4 LT |
7379 | goto drop; |
7380 | ||
d626f62b | 7381 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7382 | skb->len); |
1da177e4 | 7383 | conn->rx_len = len - skb->len; |
d73a0988 AE |
7384 | break; |
7385 | ||
7386 | case ACL_CONT: | |
1da177e4 LT |
7387 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
7388 | ||
7389 | if (!conn->rx_len) { | |
7390 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
7391 | l2cap_conn_unreliable(conn, ECOMM); | |
7392 | goto drop; | |
7393 | } | |
7394 | ||
7395 | if (skb->len > conn->rx_len) { | |
7396 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 7397 | skb->len, conn->rx_len); |
1da177e4 LT |
7398 | kfree_skb(conn->rx_skb); |
7399 | conn->rx_skb = NULL; | |
7400 | conn->rx_len = 0; | |
7401 | l2cap_conn_unreliable(conn, ECOMM); | |
7402 | goto drop; | |
7403 | } | |
7404 | ||
d626f62b | 7405 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7406 | skb->len); |
1da177e4 LT |
7407 | conn->rx_len -= skb->len; |
7408 | ||
7409 | if (!conn->rx_len) { | |
c4e5bafa JH |
7410 | /* Complete frame received. l2cap_recv_frame |
7411 | * takes ownership of the skb so set the global | |
7412 | * rx_skb pointer to NULL first. | |
7413 | */ | |
7414 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 7415 | conn->rx_skb = NULL; |
c4e5bafa | 7416 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 7417 | } |
d73a0988 | 7418 | break; |
1da177e4 LT |
7419 | } |
7420 | ||
7421 | drop: | |
7422 | kfree_skb(skb); | |
7423 | return 0; | |
7424 | } | |
7425 | ||
aef7d97c | 7426 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 7427 | { |
23691d75 | 7428 | struct l2cap_chan *c; |
1da177e4 | 7429 | |
333055f2 | 7430 | read_lock(&chan_list_lock); |
1da177e4 | 7431 | |
23691d75 | 7432 | list_for_each_entry(c, &chan_list, global_l) { |
fcb73338 | 7433 | seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7eafc59e | 7434 | &c->src, &c->dst, |
fcb73338 AE |
7435 | c->state, __le16_to_cpu(c->psm), |
7436 | c->scid, c->dcid, c->imtu, c->omtu, | |
7437 | c->sec_level, c->mode); | |
61e1b4b7 | 7438 | } |
1da177e4 | 7439 | |
333055f2 | 7440 | read_unlock(&chan_list_lock); |
1da177e4 | 7441 | |
aef7d97c | 7442 | return 0; |
1da177e4 LT |
7443 | } |
7444 | ||
aef7d97c MH |
7445 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
7446 | { | |
7447 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
7448 | } | |
7449 | ||
7450 | static const struct file_operations l2cap_debugfs_fops = { | |
7451 | .open = l2cap_debugfs_open, | |
7452 | .read = seq_read, | |
7453 | .llseek = seq_lseek, | |
7454 | .release = single_release, | |
7455 | }; | |
7456 | ||
7457 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 7458 | |
64274518 | 7459 | int __init l2cap_init(void) |
1da177e4 LT |
7460 | { |
7461 | int err; | |
be9d1227 | 7462 | |
bb58f747 | 7463 | err = l2cap_init_sockets(); |
1da177e4 LT |
7464 | if (err < 0) |
7465 | return err; | |
7466 | ||
1120e4bf MH |
7467 | if (IS_ERR_OR_NULL(bt_debugfs)) |
7468 | return 0; | |
7469 | ||
7470 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
7471 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 7472 | |
f15b8ecf JH |
7473 | debugfs_create_u16("l2cap_le_max_credits", 0466, bt_debugfs, |
7474 | &le_max_credits); | |
7475 | debugfs_create_u16("l2cap_le_default_mps", 0466, bt_debugfs, | |
7476 | &le_default_mps); | |
7477 | ||
18722c24 JR |
7478 | bt_6lowpan_init(); |
7479 | ||
1da177e4 | 7480 | return 0; |
1da177e4 LT |
7481 | } |
7482 | ||
64274518 | 7483 | void l2cap_exit(void) |
1da177e4 | 7484 | { |
18722c24 | 7485 | bt_6lowpan_cleanup(); |
aef7d97c | 7486 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 7487 | l2cap_cleanup_sockets(); |
1da177e4 LT |
7488 | } |
7489 | ||
d1c4a17d GP |
7490 | module_param(disable_ertm, bool, 0644); |
7491 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |