Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
aef7d97c | 33 | #include <linux/debugfs.h> |
fcc203c3 | 34 | #include <linux/crc16.h> |
1da177e4 LT |
35 | |
36 | #include <net/bluetooth/bluetooth.h> | |
37 | #include <net/bluetooth/hci_core.h> | |
38 | #include <net/bluetooth/l2cap.h> | |
7ef9fbf0 | 39 | |
ac4b7236 | 40 | #include "smp.h" |
7024728e | 41 | #include "a2mp.h" |
7ef9fbf0 | 42 | #include "amp.h" |
1da177e4 | 43 | |
0f1bfe4e JH |
44 | #define LE_FLOWCTL_MAX_CREDITS 65535 |
45 | ||
d1de6d46 | 46 | bool disable_ertm; |
f0709e03 | 47 | |
547d1032 | 48 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD; |
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 | |
a250e048 | 66 | static inline u8 bdaddr_type(u8 link_type, u8 bdaddr_type) |
4f1654e0 | 67 | { |
a250e048 JH |
68 | if (link_type == LE_LINK) { |
69 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) | |
4f1654e0 MH |
70 | return BDADDR_LE_PUBLIC; |
71 | else | |
72 | return BDADDR_LE_RANDOM; | |
73 | } | |
74 | ||
75 | return BDADDR_BREDR; | |
76 | } | |
77 | ||
a250e048 JH |
78 | static inline u8 bdaddr_src_type(struct hci_conn *hcon) |
79 | { | |
80 | return bdaddr_type(hcon->type, hcon->src_type); | |
81 | } | |
82 | ||
83 | static inline u8 bdaddr_dst_type(struct hci_conn *hcon) | |
84 | { | |
85 | return bdaddr_type(hcon->type, hcon->dst_type); | |
86 | } | |
87 | ||
0139418c | 88 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 89 | |
2d792818 GP |
90 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
91 | u16 cid) | |
0139418c | 92 | { |
3df91ea2 | 93 | struct l2cap_chan *c; |
3d57dc68 | 94 | |
3df91ea2 AE |
95 | list_for_each_entry(c, &conn->chan_l, list) { |
96 | if (c->dcid == cid) | |
97 | return c; | |
0139418c | 98 | } |
3df91ea2 | 99 | return NULL; |
0139418c MH |
100 | } |
101 | ||
2d792818 GP |
102 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
103 | u16 cid) | |
0139418c | 104 | { |
3df91ea2 | 105 | struct l2cap_chan *c; |
3d57dc68 | 106 | |
3df91ea2 AE |
107 | list_for_each_entry(c, &conn->chan_l, list) { |
108 | if (c->scid == cid) | |
109 | return c; | |
0139418c | 110 | } |
3df91ea2 | 111 | return NULL; |
0139418c MH |
112 | } |
113 | ||
114 | /* Find channel with given SCID. | |
ef191ade | 115 | * Returns locked channel. */ |
2d792818 GP |
116 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
117 | u16 cid) | |
0139418c | 118 | { |
48454079 | 119 | struct l2cap_chan *c; |
baa7e1fa | 120 | |
3df91ea2 | 121 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 122 | c = __l2cap_get_chan_by_scid(conn, cid); |
ef191ade MM |
123 | if (c) |
124 | l2cap_chan_lock(c); | |
3df91ea2 AE |
125 | mutex_unlock(&conn->chan_lock); |
126 | ||
48454079 | 127 | return c; |
0139418c MH |
128 | } |
129 | ||
b1a130b7 MM |
130 | /* Find channel with given DCID. |
131 | * Returns locked channel. | |
132 | */ | |
133 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, | |
134 | u16 cid) | |
135 | { | |
136 | struct l2cap_chan *c; | |
137 | ||
138 | mutex_lock(&conn->chan_lock); | |
139 | c = __l2cap_get_chan_by_dcid(conn, cid); | |
140 | if (c) | |
141 | l2cap_chan_lock(c); | |
142 | mutex_unlock(&conn->chan_lock); | |
143 | ||
144 | return c; | |
145 | } | |
146 | ||
2d792818 GP |
147 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
148 | u8 ident) | |
0139418c | 149 | { |
3df91ea2 | 150 | struct l2cap_chan *c; |
3d57dc68 | 151 | |
3df91ea2 AE |
152 | list_for_each_entry(c, &conn->chan_l, list) { |
153 | if (c->ident == ident) | |
154 | return c; | |
0139418c | 155 | } |
3df91ea2 | 156 | return NULL; |
0139418c MH |
157 | } |
158 | ||
5b155ef9 MM |
159 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
160 | u8 ident) | |
161 | { | |
162 | struct l2cap_chan *c; | |
163 | ||
164 | mutex_lock(&conn->chan_lock); | |
165 | c = __l2cap_get_chan_by_ident(conn, ident); | |
166 | if (c) | |
167 | l2cap_chan_lock(c); | |
168 | mutex_unlock(&conn->chan_lock); | |
169 | ||
170 | return c; | |
171 | } | |
172 | ||
23691d75 | 173 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 174 | { |
23691d75 | 175 | struct l2cap_chan *c; |
9e4425ff | 176 | |
23691d75 | 177 | list_for_each_entry(c, &chan_list, global_l) { |
7eafc59e | 178 | if (c->sport == psm && !bacmp(&c->src, src)) |
250938cb | 179 | return c; |
9e4425ff | 180 | } |
250938cb | 181 | return NULL; |
9e4425ff GP |
182 | } |
183 | ||
184 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
185 | { | |
73b2ec18 GP |
186 | int err; |
187 | ||
333055f2 | 188 | write_lock(&chan_list_lock); |
9e4425ff | 189 | |
23691d75 | 190 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
191 | err = -EADDRINUSE; |
192 | goto done; | |
9e4425ff GP |
193 | } |
194 | ||
73b2ec18 GP |
195 | if (psm) { |
196 | chan->psm = psm; | |
197 | chan->sport = psm; | |
198 | err = 0; | |
199 | } else { | |
200 | u16 p; | |
201 | ||
202 | err = -EINVAL; | |
203 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 204 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
205 | chan->psm = cpu_to_le16(p); |
206 | chan->sport = cpu_to_le16(p); | |
207 | err = 0; | |
208 | break; | |
209 | } | |
210 | } | |
9e4425ff | 211 | |
73b2ec18 | 212 | done: |
333055f2 | 213 | write_unlock(&chan_list_lock); |
73b2ec18 | 214 | return err; |
9e4425ff | 215 | } |
6b8d4a6a | 216 | EXPORT_SYMBOL_GPL(l2cap_add_psm); |
9e4425ff GP |
217 | |
218 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
219 | { | |
333055f2 | 220 | write_lock(&chan_list_lock); |
9e4425ff | 221 | |
14824308 JH |
222 | /* Override the defaults (which are for conn-oriented) */ |
223 | chan->omtu = L2CAP_DEFAULT_MTU; | |
224 | chan->chan_type = L2CAP_CHAN_FIXED; | |
225 | ||
9e4425ff GP |
226 | chan->scid = scid; |
227 | ||
333055f2 | 228 | write_unlock(&chan_list_lock); |
9e4425ff GP |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
baa7e1fa | 233 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 234 | { |
e77af755 | 235 | u16 cid, dyn_end; |
0139418c | 236 | |
e77af755 JH |
237 | if (conn->hcon->type == LE_LINK) |
238 | dyn_end = L2CAP_CID_LE_DYN_END; | |
239 | else | |
240 | dyn_end = L2CAP_CID_DYN_END; | |
241 | ||
242 | for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) { | |
baa7e1fa | 243 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
244 | return cid; |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
f93fa273 | 250 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 251 | { |
42d2d87c | 252 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
2d792818 | 253 | state_to_string(state)); |
badaaa00 | 254 | |
89bc500e | 255 | chan->state = state; |
53f52121 | 256 | chan->ops->state_change(chan, state, 0); |
89bc500e GP |
257 | } |
258 | ||
f8e73017 GP |
259 | static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, |
260 | int state, int err) | |
2e0052e4 | 261 | { |
f8e73017 | 262 | chan->state = state; |
53f52121 | 263 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
264 | } |
265 | ||
266 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
267 | { | |
f8e73017 | 268 | chan->ops->state_change(chan, chan->state, err); |
2e0052e4 AE |
269 | } |
270 | ||
4239d16f MM |
271 | static void __set_retrans_timer(struct l2cap_chan *chan) |
272 | { | |
273 | if (!delayed_work_pending(&chan->monitor_timer) && | |
274 | chan->retrans_timeout) { | |
275 | l2cap_set_timer(chan, &chan->retrans_timer, | |
276 | msecs_to_jiffies(chan->retrans_timeout)); | |
277 | } | |
278 | } | |
279 | ||
280 | static void __set_monitor_timer(struct l2cap_chan *chan) | |
281 | { | |
282 | __clear_retrans_timer(chan); | |
283 | if (chan->monitor_timeout) { | |
284 | l2cap_set_timer(chan, &chan->monitor_timer, | |
285 | msecs_to_jiffies(chan->monitor_timeout)); | |
286 | } | |
287 | } | |
288 | ||
608bcc6d MM |
289 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
290 | u16 seq) | |
291 | { | |
292 | struct sk_buff *skb; | |
293 | ||
294 | skb_queue_walk(head, skb) { | |
a4368ff3 | 295 | if (bt_cb(skb)->l2cap.txseq == seq) |
608bcc6d MM |
296 | return skb; |
297 | } | |
298 | ||
299 | return NULL; | |
300 | } | |
301 | ||
3c588192 MM |
302 | /* ---- L2CAP sequence number lists ---- */ |
303 | ||
304 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
305 | * SREJ requests that are received and for frames that are to be | |
306 | * retransmitted. These seq_list functions implement a singly-linked | |
307 | * list in an array, where membership in the list can also be checked | |
308 | * in constant time. Items can also be added to the tail of the list | |
309 | * and removed from the head in constant time, without further memory | |
310 | * allocs or frees. | |
311 | */ | |
312 | ||
313 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
314 | { | |
315 | size_t alloc_size, i; | |
316 | ||
317 | /* Allocated size is a power of 2 to map sequence numbers | |
318 | * (which may be up to 14 bits) in to a smaller array that is | |
319 | * sized for the negotiated ERTM transmit windows. | |
320 | */ | |
321 | alloc_size = roundup_pow_of_two(size); | |
322 | ||
323 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
324 | if (!seq_list->list) | |
325 | return -ENOMEM; | |
326 | ||
327 | seq_list->mask = alloc_size - 1; | |
328 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
329 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
330 | for (i = 0; i < alloc_size; i++) | |
331 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
337 | { | |
338 | kfree(seq_list->list); | |
339 | } | |
340 | ||
341 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
342 | u16 seq) | |
343 | { | |
344 | /* Constant-time check for list membership */ | |
345 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
346 | } | |
347 | ||
03a0c5d6 | 348 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) |
3c588192 | 349 | { |
03a0c5d6 | 350 | u16 seq = seq_list->head; |
3c588192 MM |
351 | u16 mask = seq_list->mask; |
352 | ||
03a0c5d6 JH |
353 | seq_list->head = seq_list->list[seq & mask]; |
354 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
355 | ||
356 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
357 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
358 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 | 359 | } |
3c588192 | 360 | |
03a0c5d6 | 361 | return seq; |
3c588192 MM |
362 | } |
363 | ||
364 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
365 | { | |
f522ae36 | 366 | u16 i; |
3c588192 | 367 | |
f522ae36 GP |
368 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
369 | return; | |
370 | ||
371 | for (i = 0; i <= seq_list->mask; i++) | |
372 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
373 | ||
374 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
375 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
376 | } |
377 | ||
378 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
379 | { | |
380 | u16 mask = seq_list->mask; | |
381 | ||
382 | /* All appends happen in constant time */ | |
383 | ||
f522ae36 GP |
384 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
385 | return; | |
3c588192 | 386 | |
f522ae36 GP |
387 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
388 | seq_list->head = seq; | |
389 | else | |
390 | seq_list->list[seq_list->tail & mask] = seq; | |
391 | ||
392 | seq_list->tail = seq; | |
393 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
394 | } |
395 | ||
721c4181 | 396 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 397 | { |
721c4181 | 398 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2d792818 | 399 | chan_timer.work); |
3df91ea2 | 400 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
401 | int reason; |
402 | ||
e05dcc32 | 403 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 404 | |
3df91ea2 | 405 | mutex_lock(&conn->chan_lock); |
6be36555 | 406 | l2cap_chan_lock(chan); |
ab07801d | 407 | |
89bc500e | 408 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 409 | reason = ECONNREFUSED; |
89bc500e | 410 | else if (chan->state == BT_CONNECT && |
2d792818 | 411 | chan->sec_level != BT_SECURITY_SDP) |
ab07801d GP |
412 | reason = ECONNREFUSED; |
413 | else | |
414 | reason = ETIMEDOUT; | |
415 | ||
0f852724 | 416 | l2cap_chan_close(chan, reason); |
ab07801d | 417 | |
6be36555 | 418 | l2cap_chan_unlock(chan); |
ab07801d | 419 | |
80b98027 | 420 | chan->ops->close(chan); |
3df91ea2 AE |
421 | mutex_unlock(&conn->chan_lock); |
422 | ||
371fd835 | 423 | l2cap_chan_put(chan); |
ab07801d GP |
424 | } |
425 | ||
eef1d9b6 | 426 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
427 | { |
428 | struct l2cap_chan *chan; | |
429 | ||
430 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
431 | if (!chan) | |
432 | return NULL; | |
433 | ||
c03b355e AE |
434 | mutex_init(&chan->lock); |
435 | ||
ff714119 JH |
436 | /* Set default lock nesting level */ |
437 | atomic_set(&chan->nesting, L2CAP_NESTING_NORMAL); | |
438 | ||
333055f2 | 439 | write_lock(&chan_list_lock); |
23691d75 | 440 | list_add(&chan->global_l, &chan_list); |
333055f2 | 441 | write_unlock(&chan_list_lock); |
23691d75 | 442 | |
721c4181 | 443 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 444 | |
89bc500e GP |
445 | chan->state = BT_OPEN; |
446 | ||
144ad330 | 447 | kref_init(&chan->kref); |
71ba0e56 | 448 | |
2827011f MM |
449 | /* This flag is cleared in l2cap_chan_ready() */ |
450 | set_bit(CONF_NOT_COMPLETE, &chan->conf_state); | |
451 | ||
eef1d9b6 | 452 | BT_DBG("chan %p", chan); |
abc545b8 | 453 | |
48454079 GP |
454 | return chan; |
455 | } | |
6b8d4a6a | 456 | EXPORT_SYMBOL_GPL(l2cap_chan_create); |
48454079 | 457 | |
144ad330 | 458 | static void l2cap_chan_destroy(struct kref *kref) |
6ff5abbf | 459 | { |
144ad330 SS |
460 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
461 | ||
4af66c69 JK |
462 | BT_DBG("chan %p", chan); |
463 | ||
333055f2 | 464 | write_lock(&chan_list_lock); |
23691d75 | 465 | list_del(&chan->global_l); |
333055f2 | 466 | write_unlock(&chan_list_lock); |
23691d75 | 467 | |
4af66c69 | 468 | kfree(chan); |
6ff5abbf GP |
469 | } |
470 | ||
30648372 JK |
471 | void l2cap_chan_hold(struct l2cap_chan *c) |
472 | { | |
144ad330 | 473 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 474 | |
144ad330 | 475 | kref_get(&c->kref); |
30648372 JK |
476 | } |
477 | ||
478 | void l2cap_chan_put(struct l2cap_chan *c) | |
479 | { | |
144ad330 | 480 | BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount)); |
30648372 | 481 | |
144ad330 | 482 | kref_put(&c->kref, l2cap_chan_destroy); |
30648372 | 483 | } |
6b8d4a6a | 484 | EXPORT_SYMBOL_GPL(l2cap_chan_put); |
30648372 | 485 | |
bd4b1653 AE |
486 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
487 | { | |
488 | chan->fcs = L2CAP_FCS_CRC16; | |
489 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
490 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
491 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
6a5e8165 JR |
492 | chan->remote_max_tx = chan->max_tx; |
493 | chan->remote_tx_win = chan->tx_win; | |
c20f8e35 | 494 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
bd4b1653 | 495 | chan->sec_level = BT_SECURITY_LOW; |
6a5e8165 JR |
496 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
497 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; | |
498 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; | |
499 | chan->conf_state = 0; | |
bd4b1653 AE |
500 | |
501 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
502 | } | |
6b8d4a6a | 503 | EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults); |
bd4b1653 | 504 | |
0ce43ce6 | 505 | static void l2cap_le_flowctl_init(struct l2cap_chan *chan) |
38319713 | 506 | { |
0ce43ce6 JH |
507 | chan->sdu = NULL; |
508 | chan->sdu_last_frag = NULL; | |
509 | chan->sdu_len = 0; | |
0cd75f7e | 510 | chan->tx_credits = 0; |
f15b8ecf | 511 | chan->rx_credits = le_max_credits; |
d1d79413 | 512 | chan->mps = min_t(u16, chan->imtu, le_default_mps); |
0ce43ce6 JH |
513 | |
514 | skb_queue_head_init(&chan->tx_q); | |
38319713 JH |
515 | } |
516 | ||
93c3e8f5 | 517 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 518 | { |
af05b30b | 519 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 520 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 521 | |
9f5a0d7b | 522 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 523 | |
8c1d787b | 524 | chan->conn = conn; |
0139418c | 525 | |
5491120e AE |
526 | switch (chan->chan_type) { |
527 | case L2CAP_CHAN_CONN_ORIENTED: | |
21626e62 JH |
528 | /* Alloc CID for connection-oriented socket */ |
529 | chan->scid = l2cap_alloc_cid(conn); | |
530 | if (conn->hcon->type == ACL_LINK) | |
0c1bc5c6 | 531 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
532 | break; |
533 | ||
534 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 535 | /* Connectionless socket */ |
fe4128e0 GP |
536 | chan->scid = L2CAP_CID_CONN_LESS; |
537 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 538 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
539 | break; |
540 | ||
2338a7e0 JH |
541 | case L2CAP_CHAN_FIXED: |
542 | /* Caller will set CID and CID specific MTU values */ | |
416fa752 AE |
543 | break; |
544 | ||
5491120e | 545 | default: |
0139418c | 546 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
547 | chan->scid = L2CAP_CID_SIGNALING; |
548 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 549 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
550 | } |
551 | ||
8f7975b1 AE |
552 | chan->local_id = L2CAP_BESTEFFORT_ID; |
553 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
554 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
555 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
556 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
8936fa6d | 557 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
8f7975b1 | 558 | |
371fd835 | 559 | l2cap_chan_hold(chan); |
baa7e1fa | 560 | |
c16900cf JH |
561 | /* Only keep a reference for fixed channels if they requested it */ |
562 | if (chan->chan_type != L2CAP_CHAN_FIXED || | |
563 | test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) | |
564 | hci_conn_hold(conn->hcon); | |
5ee9891d | 565 | |
3df91ea2 | 566 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
567 | } |
568 | ||
466f8004 | 569 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
570 | { |
571 | mutex_lock(&conn->chan_lock); | |
572 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 573 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
574 | } |
575 | ||
466f8004 | 576 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 577 | { |
8c1d787b | 578 | struct l2cap_conn *conn = chan->conn; |
0139418c | 579 | |
c9b66675 | 580 | __clear_chan_timer(chan); |
0139418c | 581 | |
49d11741 JH |
582 | BT_DBG("chan %p, conn %p, err %d, state %s", chan, conn, err, |
583 | state_to_string(chan->state)); | |
0139418c | 584 | |
72847ce0 JH |
585 | chan->ops->teardown(chan, err); |
586 | ||
8e87d142 | 587 | if (conn) { |
56f60984 | 588 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
baa7e1fa | 589 | /* Delete from channel list */ |
3df91ea2 | 590 | list_del(&chan->list); |
3d57dc68 | 591 | |
371fd835 | 592 | l2cap_chan_put(chan); |
baa7e1fa | 593 | |
8c1d787b | 594 | chan->conn = NULL; |
3cabbfda | 595 | |
c16900cf JH |
596 | /* Reference was only held for non-fixed channels or |
597 | * fixed channels that explicitly requested it using the | |
598 | * FLAG_HOLD_HCI_CONN flag. | |
599 | */ | |
600 | if (chan->chan_type != L2CAP_CHAN_FIXED || | |
601 | test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) | |
76a68ba0 | 602 | hci_conn_drop(conn->hcon); |
56f60984 AE |
603 | |
604 | if (mgr && mgr->bredr_chan == chan) | |
605 | mgr->bredr_chan = NULL; | |
0139418c MH |
606 | } |
607 | ||
419e08c1 AE |
608 | if (chan->hs_hchan) { |
609 | struct hci_chan *hs_hchan = chan->hs_hchan; | |
610 | ||
611 | BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan); | |
612 | amp_disconnect_logical_link(hs_hchan); | |
613 | } | |
614 | ||
2827011f | 615 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
6ff5abbf | 616 | return; |
2ead70b8 | 617 | |
ee556f66 GP |
618 | switch(chan->mode) { |
619 | case L2CAP_MODE_BASIC: | |
620 | break; | |
c13ffa62 | 621 | |
38319713 | 622 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b | 623 | skb_queue_purge(&chan->tx_q); |
38319713 JH |
624 | break; |
625 | ||
ee556f66 | 626 | case L2CAP_MODE_ERTM: |
1a09bcb9 GP |
627 | __clear_retrans_timer(chan); |
628 | __clear_monitor_timer(chan); | |
629 | __clear_ack_timer(chan); | |
c13ffa62 | 630 | |
f1c6775b | 631 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 632 | |
3c588192 MM |
633 | l2cap_seq_list_free(&chan->srej_list); |
634 | l2cap_seq_list_free(&chan->retrans_list); | |
ee556f66 GP |
635 | |
636 | /* fall through */ | |
637 | ||
638 | case L2CAP_MODE_STREAMING: | |
639 | skb_queue_purge(&chan->tx_q); | |
640 | break; | |
c13ffa62 | 641 | } |
ee556f66 GP |
642 | |
643 | return; | |
0139418c | 644 | } |
6b8d4a6a | 645 | EXPORT_SYMBOL_GPL(l2cap_chan_del); |
0139418c | 646 | |
f3d82d0c | 647 | static void l2cap_conn_update_id_addr(struct work_struct *work) |
387a33e3 | 648 | { |
f3d82d0c JH |
649 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
650 | id_addr_update_work); | |
651 | struct hci_conn *hcon = conn->hcon; | |
387a33e3 JH |
652 | struct l2cap_chan *chan; |
653 | ||
654 | mutex_lock(&conn->chan_lock); | |
655 | ||
656 | list_for_each_entry(chan, &conn->chan_l, list) { | |
657 | l2cap_chan_lock(chan); | |
658 | bacpy(&chan->dst, &hcon->dst); | |
a250e048 | 659 | chan->dst_type = bdaddr_dst_type(hcon); |
387a33e3 JH |
660 | l2cap_chan_unlock(chan); |
661 | } | |
662 | ||
663 | mutex_unlock(&conn->chan_lock); | |
664 | } | |
665 | ||
27e2d4c8 JH |
666 | static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) |
667 | { | |
668 | struct l2cap_conn *conn = chan->conn; | |
669 | struct l2cap_le_conn_rsp rsp; | |
670 | u16 result; | |
671 | ||
672 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
673 | result = L2CAP_CR_AUTHORIZATION; | |
674 | else | |
675 | result = L2CAP_CR_BAD_PSM; | |
676 | ||
677 | l2cap_state_change(chan, BT_DISCONN); | |
678 | ||
679 | rsp.dcid = cpu_to_le16(chan->scid); | |
680 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 681 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 682 | rsp.credits = cpu_to_le16(chan->rx_credits); |
27e2d4c8 JH |
683 | rsp.result = cpu_to_le16(result); |
684 | ||
685 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
686 | &rsp); | |
687 | } | |
688 | ||
791d60f7 JH |
689 | static void l2cap_chan_connect_reject(struct l2cap_chan *chan) |
690 | { | |
691 | struct l2cap_conn *conn = chan->conn; | |
692 | struct l2cap_conn_rsp rsp; | |
693 | u16 result; | |
694 | ||
695 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) | |
696 | result = L2CAP_CR_SEC_BLOCK; | |
697 | else | |
698 | result = L2CAP_CR_BAD_PSM; | |
699 | ||
700 | l2cap_state_change(chan, BT_DISCONN); | |
701 | ||
702 | rsp.scid = cpu_to_le16(chan->dcid); | |
703 | rsp.dcid = cpu_to_le16(chan->scid); | |
704 | rsp.result = cpu_to_le16(result); | |
dcf4adbf | 705 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
791d60f7 JH |
706 | |
707 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
708 | } | |
709 | ||
0f852724 | 710 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
711 | { |
712 | struct l2cap_conn *conn = chan->conn; | |
4519de9a | 713 | |
7eafc59e | 714 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
4519de9a | 715 | |
89bc500e | 716 | switch (chan->state) { |
4519de9a | 717 | case BT_LISTEN: |
b699ec0d | 718 | chan->ops->teardown(chan, 0); |
4519de9a GP |
719 | break; |
720 | ||
721 | case BT_CONNECTED: | |
722 | case BT_CONFIG: | |
7b25c9b3 | 723 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
8d836d71 | 724 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
5e4e3972 | 725 | l2cap_send_disconn_req(chan, reason); |
4519de9a GP |
726 | } else |
727 | l2cap_chan_del(chan, reason); | |
728 | break; | |
729 | ||
730 | case BT_CONNECT2: | |
791d60f7 JH |
731 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
732 | if (conn->hcon->type == ACL_LINK) | |
733 | l2cap_chan_connect_reject(chan); | |
27e2d4c8 JH |
734 | else if (conn->hcon->type == LE_LINK) |
735 | l2cap_chan_le_connect_reject(chan); | |
4519de9a GP |
736 | } |
737 | ||
738 | l2cap_chan_del(chan, reason); | |
739 | break; | |
740 | ||
741 | case BT_CONNECT: | |
742 | case BT_DISCONN: | |
743 | l2cap_chan_del(chan, reason); | |
744 | break; | |
745 | ||
746 | default: | |
b699ec0d | 747 | chan->ops->teardown(chan, 0); |
4519de9a GP |
748 | break; |
749 | } | |
750 | } | |
6b8d4a6a | 751 | EXPORT_SYMBOL(l2cap_chan_close); |
4519de9a | 752 | |
4343478f | 753 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 754 | { |
6a974b50 MH |
755 | switch (chan->chan_type) { |
756 | case L2CAP_CHAN_RAW: | |
4343478f | 757 | switch (chan->sec_level) { |
8556edd3 | 758 | case BT_SECURITY_HIGH: |
7d513e92 | 759 | case BT_SECURITY_FIPS: |
8556edd3 JH |
760 | return HCI_AT_DEDICATED_BONDING_MITM; |
761 | case BT_SECURITY_MEDIUM: | |
762 | return HCI_AT_DEDICATED_BONDING; | |
763 | default: | |
764 | return HCI_AT_NO_BONDING; | |
765 | } | |
6a974b50 | 766 | break; |
3124b843 | 767 | case L2CAP_CHAN_CONN_LESS: |
dcf4adbf | 768 | if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) { |
3124b843 MH |
769 | if (chan->sec_level == BT_SECURITY_LOW) |
770 | chan->sec_level = BT_SECURITY_SDP; | |
771 | } | |
7d513e92 MH |
772 | if (chan->sec_level == BT_SECURITY_HIGH || |
773 | chan->sec_level == BT_SECURITY_FIPS) | |
3124b843 MH |
774 | return HCI_AT_NO_BONDING_MITM; |
775 | else | |
776 | return HCI_AT_NO_BONDING; | |
777 | break; | |
6a974b50 | 778 | case L2CAP_CHAN_CONN_ORIENTED: |
dcf4adbf | 779 | if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) { |
6a974b50 MH |
780 | if (chan->sec_level == BT_SECURITY_LOW) |
781 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 782 | |
7d513e92 MH |
783 | if (chan->sec_level == BT_SECURITY_HIGH || |
784 | chan->sec_level == BT_SECURITY_FIPS) | |
6a974b50 MH |
785 | return HCI_AT_NO_BONDING_MITM; |
786 | else | |
787 | return HCI_AT_NO_BONDING; | |
788 | } | |
789 | /* fall through */ | |
790 | default: | |
4343478f | 791 | switch (chan->sec_level) { |
00ae4af9 | 792 | case BT_SECURITY_HIGH: |
7d513e92 | 793 | case BT_SECURITY_FIPS: |
8556edd3 | 794 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 795 | case BT_SECURITY_MEDIUM: |
8556edd3 | 796 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 797 | default: |
8556edd3 | 798 | return HCI_AT_NO_BONDING; |
00ae4af9 | 799 | } |
6a974b50 | 800 | break; |
0684e5f9 | 801 | } |
8556edd3 JH |
802 | } |
803 | ||
804 | /* Service level security */ | |
e7cafc45 | 805 | int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator) |
8556edd3 | 806 | { |
8c1d787b | 807 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
808 | __u8 auth_type; |
809 | ||
a17de2fe JH |
810 | if (conn->hcon->type == LE_LINK) |
811 | return smp_conn_security(conn->hcon, chan->sec_level); | |
812 | ||
4343478f | 813 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 814 | |
e7cafc45 JH |
815 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type, |
816 | initiator); | |
79d554a6 MH |
817 | } |
818 | ||
b5ad8b7f | 819 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
820 | { |
821 | u8 id; | |
822 | ||
823 | /* Get next available identificator. | |
824 | * 1 - 128 are used by kernel. | |
825 | * 129 - 199 are reserved. | |
826 | * 200 - 254 are used by utilities like l2ping, etc. | |
827 | */ | |
828 | ||
5a54e7c8 | 829 | mutex_lock(&conn->ident_lock); |
4e8402a3 MH |
830 | |
831 | if (++conn->tx_ident > 128) | |
832 | conn->tx_ident = 1; | |
833 | ||
834 | id = conn->tx_ident; | |
835 | ||
5a54e7c8 | 836 | mutex_unlock(&conn->ident_lock); |
4e8402a3 MH |
837 | |
838 | return id; | |
839 | } | |
840 | ||
2d792818 GP |
841 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
842 | void *data) | |
4e8402a3 MH |
843 | { |
844 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 845 | u8 flags; |
4e8402a3 MH |
846 | |
847 | BT_DBG("code 0x%2.2x", code); | |
848 | ||
849 | if (!skb) | |
9a9c6a34 | 850 | return; |
4e8402a3 | 851 | |
f6af675e SW |
852 | /* Use NO_FLUSH if supported or we have an LE link (which does |
853 | * not support auto-flushing packets) */ | |
854 | if (lmp_no_flush_capable(conn->hcon->hdev) || | |
855 | conn->hcon->type == LE_LINK) | |
e702112f AE |
856 | flags = ACL_START_NO_FLUSH; |
857 | else | |
858 | flags = ACL_START; | |
859 | ||
14b12d0b | 860 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 861 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 862 | |
73d80deb LAD |
863 | hci_send_acl(conn->hchan, skb, flags); |
864 | } | |
865 | ||
02b0fbb9 MM |
866 | static bool __chan_is_moving(struct l2cap_chan *chan) |
867 | { | |
868 | return chan->move_state != L2CAP_MOVE_STABLE && | |
869 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; | |
870 | } | |
871 | ||
73d80deb LAD |
872 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
873 | { | |
874 | struct hci_conn *hcon = chan->conn->hcon; | |
875 | u16 flags; | |
876 | ||
877 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
2d792818 | 878 | skb->priority); |
73d80deb | 879 | |
d5f8a75d MM |
880 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
881 | if (chan->hs_hchan) | |
882 | hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE); | |
883 | else | |
884 | kfree_skb(skb); | |
885 | ||
886 | return; | |
887 | } | |
888 | ||
f6af675e SW |
889 | /* Use NO_FLUSH for LE links (where this is the only option) or |
890 | * if the BR/EDR link supports it and flushing has not been | |
891 | * explicitly requested (through FLAG_FLUSHABLE). | |
892 | */ | |
893 | if (hcon->type == LE_LINK || | |
894 | (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
895 | lmp_no_flush_capable(hcon->hdev))) | |
73d80deb LAD |
896 | flags = ACL_START_NO_FLUSH; |
897 | else | |
898 | flags = ACL_START; | |
14b12d0b | 899 | |
73d80deb LAD |
900 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
901 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
902 | } |
903 | ||
b76bbd66 MM |
904 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
905 | { | |
906 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
907 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
908 | ||
909 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
910 | /* S-Frame */ | |
911 | control->sframe = 1; | |
912 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
913 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
914 | ||
915 | control->sar = 0; | |
916 | control->txseq = 0; | |
917 | } else { | |
918 | /* I-Frame */ | |
919 | control->sframe = 0; | |
920 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
921 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
922 | ||
923 | control->poll = 0; | |
924 | control->super = 0; | |
925 | } | |
926 | } | |
927 | ||
b76bbd66 MM |
928 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
929 | { | |
930 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
931 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
932 | ||
933 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
934 | /* S-Frame */ | |
935 | control->sframe = 1; | |
936 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
937 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
938 | ||
939 | control->sar = 0; | |
940 | control->txseq = 0; | |
941 | } else { | |
942 | /* I-Frame */ | |
943 | control->sframe = 0; | |
944 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
945 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
946 | ||
947 | control->poll = 0; | |
948 | control->super = 0; | |
949 | } | |
950 | } | |
951 | ||
952 | static inline void __unpack_control(struct l2cap_chan *chan, | |
953 | struct sk_buff *skb) | |
954 | { | |
955 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
956 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
a4368ff3 | 957 | &bt_cb(skb)->l2cap); |
cec8ab6e | 958 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
b76bbd66 MM |
959 | } else { |
960 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
a4368ff3 | 961 | &bt_cb(skb)->l2cap); |
cec8ab6e | 962 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
b76bbd66 MM |
963 | } |
964 | } | |
965 | ||
b5c6aaed MM |
966 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
967 | { | |
968 | u32 packed; | |
969 | ||
970 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
971 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
972 | ||
973 | if (control->sframe) { | |
974 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
975 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
976 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
977 | } else { | |
978 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
979 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
980 | } | |
981 | ||
982 | return packed; | |
983 | } | |
984 | ||
985 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
986 | { | |
987 | u16 packed; | |
988 | ||
989 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
990 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
991 | ||
992 | if (control->sframe) { | |
993 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
994 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
995 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
996 | } else { | |
997 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
998 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
999 | } | |
1000 | ||
1001 | return packed; | |
1002 | } | |
1003 | ||
b76bbd66 MM |
1004 | static inline void __pack_control(struct l2cap_chan *chan, |
1005 | struct l2cap_ctrl *control, | |
1006 | struct sk_buff *skb) | |
1007 | { | |
1008 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1009 | put_unaligned_le32(__pack_extended_control(control), | |
1010 | skb->data + L2CAP_HDR_SIZE); | |
1011 | } else { | |
1012 | put_unaligned_le16(__pack_enhanced_control(control), | |
1013 | skb->data + L2CAP_HDR_SIZE); | |
1014 | } | |
1015 | } | |
1016 | ||
ba7aa64f GP |
1017 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
1018 | { | |
1019 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1020 | return L2CAP_EXT_HDR_SIZE; | |
1021 | else | |
1022 | return L2CAP_ENH_HDR_SIZE; | |
1023 | } | |
1024 | ||
a67d7f6f MM |
1025 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
1026 | u32 control) | |
b5c6aaed MM |
1027 | { |
1028 | struct sk_buff *skb; | |
1029 | struct l2cap_hdr *lh; | |
ba7aa64f | 1030 | int hlen = __ertm_hdr_size(chan); |
b5c6aaed MM |
1031 | |
1032 | if (chan->fcs == L2CAP_FCS_CRC16) | |
1033 | hlen += L2CAP_FCS_SIZE; | |
1034 | ||
a67d7f6f | 1035 | skb = bt_skb_alloc(hlen, GFP_KERNEL); |
b5c6aaed | 1036 | |
b5c6aaed | 1037 | if (!skb) |
a67d7f6f | 1038 | return ERR_PTR(-ENOMEM); |
b5c6aaed MM |
1039 | |
1040 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1041 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
1042 | lh->cid = cpu_to_le16(chan->dcid); | |
1043 | ||
a67d7f6f MM |
1044 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1045 | put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
1046 | else | |
1047 | put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
b5c6aaed MM |
1048 | |
1049 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
a67d7f6f | 1050 | u16 fcs = crc16(0, (u8 *)skb->data, skb->len); |
b5c6aaed MM |
1051 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); |
1052 | } | |
1053 | ||
1054 | skb->priority = HCI_PRIO_MAX; | |
a67d7f6f MM |
1055 | return skb; |
1056 | } | |
1057 | ||
1058 | static void l2cap_send_sframe(struct l2cap_chan *chan, | |
1059 | struct l2cap_ctrl *control) | |
1060 | { | |
1061 | struct sk_buff *skb; | |
1062 | u32 control_field; | |
1063 | ||
1064 | BT_DBG("chan %p, control %p", chan, control); | |
1065 | ||
1066 | if (!control->sframe) | |
1067 | return; | |
1068 | ||
b99e13ad MM |
1069 | if (__chan_is_moving(chan)) |
1070 | return; | |
1071 | ||
a67d7f6f MM |
1072 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) && |
1073 | !control->poll) | |
1074 | control->final = 1; | |
1075 | ||
1076 | if (control->super == L2CAP_SUPER_RR) | |
1077 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
1078 | else if (control->super == L2CAP_SUPER_RNR) | |
1079 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
1080 | ||
1081 | if (control->super != L2CAP_SUPER_SREJ) { | |
1082 | chan->last_acked_seq = control->reqseq; | |
1083 | __clear_ack_timer(chan); | |
1084 | } | |
1085 | ||
1086 | BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq, | |
1087 | control->final, control->poll, control->super); | |
1088 | ||
1089 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
1090 | control_field = __pack_extended_control(control); | |
1091 | else | |
1092 | control_field = __pack_enhanced_control(control); | |
1093 | ||
1094 | skb = l2cap_create_sframe_pdu(chan, control_field); | |
1095 | if (!IS_ERR(skb)) | |
1096 | l2cap_do_send(chan, skb); | |
b5c6aaed MM |
1097 | } |
1098 | ||
c9e3d5e0 | 1099 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
b5c6aaed | 1100 | { |
c9e3d5e0 MM |
1101 | struct l2cap_ctrl control; |
1102 | ||
1103 | BT_DBG("chan %p, poll %d", chan, poll); | |
1104 | ||
1105 | memset(&control, 0, sizeof(control)); | |
1106 | control.sframe = 1; | |
1107 | control.poll = poll; | |
1108 | ||
1109 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
1110 | control.super = L2CAP_SUPER_RNR; | |
1111 | else | |
1112 | control.super = L2CAP_SUPER_RR; | |
b5c6aaed | 1113 | |
c9e3d5e0 MM |
1114 | control.reqseq = chan->buffer_seq; |
1115 | l2cap_send_sframe(chan, &control); | |
b5c6aaed MM |
1116 | } |
1117 | ||
b4450035 | 1118 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 1119 | { |
5ff6f34d JH |
1120 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
1121 | return true; | |
1122 | ||
c1360a1c | 1123 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
1124 | } |
1125 | ||
1df7b17a | 1126 | static bool __amp_capable(struct l2cap_chan *chan) |
80d58d0b | 1127 | { |
1df7b17a | 1128 | struct l2cap_conn *conn = chan->conn; |
80d58d0b | 1129 | struct hci_dev *hdev; |
1df7b17a MH |
1130 | bool amp_available = false; |
1131 | ||
0bd49fc7 | 1132 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
1df7b17a MH |
1133 | return false; |
1134 | ||
0bd49fc7 | 1135 | if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP)) |
1df7b17a | 1136 | return false; |
80d58d0b MH |
1137 | |
1138 | read_lock(&hci_dev_list_lock); | |
1df7b17a | 1139 | list_for_each_entry(hdev, &hci_dev_list, list) { |
80d58d0b | 1140 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1df7b17a MH |
1141 | test_bit(HCI_UP, &hdev->flags)) { |
1142 | amp_available = true; | |
1143 | break; | |
1144 | } | |
1145 | } | |
80d58d0b MH |
1146 | read_unlock(&hci_dev_list_lock); |
1147 | ||
1df7b17a MH |
1148 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1149 | return amp_available; | |
848566b3 MH |
1150 | |
1151 | return false; | |
93c3e8f5 AE |
1152 | } |
1153 | ||
5ce66b59 AE |
1154 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1155 | { | |
1156 | /* Check EFS parameters */ | |
1157 | return true; | |
1158 | } | |
1159 | ||
2766be48 | 1160 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
9b27f350 AE |
1161 | { |
1162 | struct l2cap_conn *conn = chan->conn; | |
1163 | struct l2cap_conn_req req; | |
1164 | ||
1165 | req.scid = cpu_to_le16(chan->scid); | |
1166 | req.psm = chan->psm; | |
1167 | ||
1168 | chan->ident = l2cap_get_ident(conn); | |
1169 | ||
1170 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
1171 | ||
1172 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
1173 | } | |
1174 | ||
8eb200bd MM |
1175 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1176 | { | |
1177 | struct l2cap_create_chan_req req; | |
1178 | req.scid = cpu_to_le16(chan->scid); | |
1179 | req.psm = chan->psm; | |
1180 | req.amp_id = amp_id; | |
1181 | ||
1182 | chan->ident = l2cap_get_ident(chan->conn); | |
1183 | ||
1184 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ, | |
1185 | sizeof(req), &req); | |
1186 | } | |
1187 | ||
02b0fbb9 MM |
1188 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1189 | { | |
1190 | struct sk_buff *skb; | |
1191 | ||
1192 | BT_DBG("chan %p", chan); | |
1193 | ||
1194 | if (chan->mode != L2CAP_MODE_ERTM) | |
1195 | return; | |
1196 | ||
1197 | __clear_retrans_timer(chan); | |
1198 | __clear_monitor_timer(chan); | |
1199 | __clear_ack_timer(chan); | |
1200 | ||
1201 | chan->retry_count = 0; | |
1202 | skb_queue_walk(&chan->tx_q, skb) { | |
a4368ff3 JH |
1203 | if (bt_cb(skb)->l2cap.retries) |
1204 | bt_cb(skb)->l2cap.retries = 1; | |
02b0fbb9 MM |
1205 | else |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | chan->expected_tx_seq = chan->buffer_seq; | |
1210 | ||
1211 | clear_bit(CONN_REJ_ACT, &chan->conn_state); | |
1212 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
1213 | l2cap_seq_list_clear(&chan->retrans_list); | |
1214 | l2cap_seq_list_clear(&chan->srej_list); | |
1215 | skb_queue_purge(&chan->srej_q); | |
1216 | ||
1217 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
1218 | chan->rx_state = L2CAP_RX_STATE_MOVE; | |
1219 | ||
1220 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
1221 | } | |
1222 | ||
5f3847a4 MM |
1223 | static void l2cap_move_done(struct l2cap_chan *chan) |
1224 | { | |
1225 | u8 move_role = chan->move_role; | |
1226 | BT_DBG("chan %p", chan); | |
1227 | ||
1228 | chan->move_state = L2CAP_MOVE_STABLE; | |
1229 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
1230 | ||
1231 | if (chan->mode != L2CAP_MODE_ERTM) | |
1232 | return; | |
1233 | ||
1234 | switch (move_role) { | |
1235 | case L2CAP_MOVE_ROLE_INITIATOR: | |
1236 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL); | |
1237 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; | |
1238 | break; | |
1239 | case L2CAP_MOVE_ROLE_RESPONDER: | |
1240 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; | |
1241 | break; | |
1242 | } | |
1243 | } | |
1244 | ||
9f0caeb1 VCG |
1245 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1246 | { | |
315917e0 JH |
1247 | /* The channel may have already been flagged as connected in |
1248 | * case of receiving data before the L2CAP info req/rsp | |
1249 | * procedure is complete. | |
1250 | */ | |
1251 | if (chan->state == BT_CONNECTED) | |
1252 | return; | |
1253 | ||
2827011f | 1254 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
9f0caeb1 VCG |
1255 | chan->conf_state = 0; |
1256 | __clear_chan_timer(chan); | |
1257 | ||
0ce43ce6 JH |
1258 | if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits) |
1259 | chan->ops->suspend(chan); | |
177f8f2b | 1260 | |
54a59aa2 | 1261 | chan->state = BT_CONNECTED; |
9f0caeb1 | 1262 | |
fd83e2c2 | 1263 | chan->ops->ready(chan); |
9f0caeb1 VCG |
1264 | } |
1265 | ||
f1496dee JH |
1266 | static void l2cap_le_connect(struct l2cap_chan *chan) |
1267 | { | |
1268 | struct l2cap_conn *conn = chan->conn; | |
1269 | struct l2cap_le_conn_req req; | |
1270 | ||
595177f3 JH |
1271 | if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags)) |
1272 | return; | |
1273 | ||
f1496dee JH |
1274 | req.psm = chan->psm; |
1275 | req.scid = cpu_to_le16(chan->scid); | |
1276 | req.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 1277 | req.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 1278 | req.credits = cpu_to_le16(chan->rx_credits); |
f1496dee JH |
1279 | |
1280 | chan->ident = l2cap_get_ident(conn); | |
1281 | ||
1282 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ, | |
1283 | sizeof(req), &req); | |
1284 | } | |
1285 | ||
1286 | static void l2cap_le_start(struct l2cap_chan *chan) | |
1287 | { | |
1288 | struct l2cap_conn *conn = chan->conn; | |
1289 | ||
1290 | if (!smp_conn_security(conn->hcon, chan->sec_level)) | |
1291 | return; | |
1292 | ||
1293 | if (!chan->psm) { | |
1294 | l2cap_chan_ready(chan); | |
1295 | return; | |
1296 | } | |
1297 | ||
1298 | if (chan->state == BT_CONNECT) | |
1299 | l2cap_le_connect(chan); | |
1300 | } | |
1301 | ||
93c3e8f5 AE |
1302 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1303 | { | |
1304 | if (__amp_capable(chan)) { | |
1305 | BT_DBG("chan %p AMP capable: discover AMPs", chan); | |
1306 | a2mp_discover_amp(chan); | |
f1496dee JH |
1307 | } else if (chan->conn->hcon->type == LE_LINK) { |
1308 | l2cap_le_start(chan); | |
93c3e8f5 AE |
1309 | } else { |
1310 | l2cap_send_conn_req(chan); | |
1311 | } | |
1312 | } | |
1313 | ||
aeaeb4bb JH |
1314 | static void l2cap_request_info(struct l2cap_conn *conn) |
1315 | { | |
1316 | struct l2cap_info_req req; | |
1317 | ||
1318 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) | |
1319 | return; | |
1320 | ||
1321 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1322 | ||
1323 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1324 | conn->info_ident = l2cap_get_ident(conn); | |
1325 | ||
1326 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); | |
1327 | ||
1328 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, | |
1329 | sizeof(req), &req); | |
1330 | } | |
1331 | ||
fc7f8a7e | 1332 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 1333 | { |
8c1d787b | 1334 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 1335 | |
9f0caeb1 | 1336 | if (conn->hcon->type == LE_LINK) { |
96ac34fb | 1337 | l2cap_le_start(chan); |
9f0caeb1 VCG |
1338 | return; |
1339 | } | |
1340 | ||
aeaeb4bb JH |
1341 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) { |
1342 | l2cap_request_info(conn); | |
1343 | return; | |
1344 | } | |
79d554a6 | 1345 | |
aeaeb4bb JH |
1346 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1347 | return; | |
79d554a6 | 1348 | |
aeaeb4bb JH |
1349 | if (l2cap_chan_check_security(chan, true) && |
1350 | __l2cap_no_conn_pending(chan)) | |
1351 | l2cap_start_connection(chan); | |
79d554a6 MH |
1352 | } |
1353 | ||
cf6c2c0b GP |
1354 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1355 | { | |
1356 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 1357 | if (!disable_ertm) |
cf6c2c0b GP |
1358 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1359 | ||
1360 | switch (mode) { | |
1361 | case L2CAP_MODE_ERTM: | |
1362 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
1363 | case L2CAP_MODE_STREAMING: | |
1364 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
1365 | default: | |
1366 | return 0x00; | |
1367 | } | |
1368 | } | |
1369 | ||
5e4e3972 | 1370 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
22121fc9 | 1371 | { |
5e4e3972 | 1372 | struct l2cap_conn *conn = chan->conn; |
22121fc9 GP |
1373 | struct l2cap_disconn_req req; |
1374 | ||
c13ffa62 GP |
1375 | if (!conn) |
1376 | return; | |
1377 | ||
aad3d0e3 | 1378 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1a09bcb9 GP |
1379 | __clear_retrans_timer(chan); |
1380 | __clear_monitor_timer(chan); | |
1381 | __clear_ack_timer(chan); | |
c13ffa62 GP |
1382 | } |
1383 | ||
2338a7e0 | 1384 | if (chan->scid == L2CAP_CID_A2MP) { |
d117773c | 1385 | l2cap_state_change(chan, BT_DISCONN); |
416fa752 AE |
1386 | return; |
1387 | } | |
1388 | ||
fe4128e0 GP |
1389 | req.dcid = cpu_to_le16(chan->dcid); |
1390 | req.scid = cpu_to_le16(chan->scid); | |
2d792818 GP |
1391 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1392 | sizeof(req), &req); | |
c13ffa62 | 1393 | |
f8e73017 | 1394 | l2cap_state_change_and_error(chan, BT_DISCONN, err); |
22121fc9 GP |
1395 | } |
1396 | ||
1da177e4 | 1397 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1398 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1399 | { | |
3df91ea2 | 1400 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1401 | |
1402 | BT_DBG("conn %p", conn); | |
1403 | ||
3df91ea2 | 1404 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1405 | |
3df91ea2 | 1406 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6be36555 | 1407 | l2cap_chan_lock(chan); |
4e8402a3 | 1408 | |
715ec005 | 1409 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
aeaeb4bb | 1410 | l2cap_chan_ready(chan); |
6be36555 | 1411 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1412 | continue; |
1413 | } | |
1414 | ||
89bc500e | 1415 | if (chan->state == BT_CONNECT) { |
e7cafc45 | 1416 | if (!l2cap_chan_check_security(chan, true) || |
2d792818 | 1417 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1418 | l2cap_chan_unlock(chan); |
47731de7 GP |
1419 | continue; |
1420 | } | |
79d554a6 | 1421 | |
c1360a1c | 1422 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
2d792818 | 1423 | && test_bit(CONF_STATE2_DEVICE, |
c1360a1c | 1424 | &chan->conf_state)) { |
89bc500e | 1425 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1426 | l2cap_chan_unlock(chan); |
47731de7 | 1427 | continue; |
b1235d79 | 1428 | } |
47731de7 | 1429 | |
93c3e8f5 | 1430 | l2cap_start_connection(chan); |
47731de7 | 1431 | |
89bc500e | 1432 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1433 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1434 | char buf[128]; |
fe4128e0 GP |
1435 | rsp.scid = cpu_to_le16(chan->dcid); |
1436 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1437 | |
e7cafc45 | 1438 | if (l2cap_chan_check_security(chan, false)) { |
bdc25783 | 1439 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
dcf4adbf JP |
1440 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1441 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
2dc4e510 | 1442 | chan->ops->defer(chan); |
f66dc81f MH |
1443 | |
1444 | } else { | |
acdcabf5 | 1445 | l2cap_state_change(chan, BT_CONFIG); |
dcf4adbf JP |
1446 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1447 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
f66dc81f | 1448 | } |
79d554a6 | 1449 | } else { |
dcf4adbf JP |
1450 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1451 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
79d554a6 MH |
1452 | } |
1453 | ||
fc7f8a7e | 1454 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 1455 | sizeof(rsp), &rsp); |
e9aeb2dd | 1456 | |
c1360a1c | 1457 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
2d792818 | 1458 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1459 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1460 | continue; |
1461 | } | |
1462 | ||
c1360a1c | 1463 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1464 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 1465 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 1466 | chan->num_conf_req++; |
4e8402a3 MH |
1467 | } |
1468 | ||
6be36555 | 1469 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1470 | } |
1471 | ||
3df91ea2 | 1472 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1473 | } |
1474 | ||
b62f328b VT |
1475 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) |
1476 | { | |
cc8dba2b | 1477 | struct hci_conn *hcon = conn->hcon; |
dcc36c16 | 1478 | struct hci_dev *hdev = hcon->hdev; |
b62f328b | 1479 | |
e760ec12 | 1480 | BT_DBG("%s conn %p", hdev->name, conn); |
b62f328b | 1481 | |
e760ec12 JH |
1482 | /* For outgoing pairing which doesn't necessarily have an |
1483 | * associated socket (e.g. mgmt_pair_device). | |
1484 | */ | |
1485 | if (hcon->out) | |
1486 | smp_conn_security(hcon, hcon->pending_sec_level); | |
cc8dba2b | 1487 | |
80afeb6c MH |
1488 | /* For LE slave connections, make sure the connection interval |
1489 | * is in the range of the minium and maximum interval that has | |
1490 | * been configured for this connection. If not, then trigger | |
1491 | * the connection update procedure. | |
1492 | */ | |
40bef302 | 1493 | if (hcon->role == HCI_ROLE_SLAVE && |
80afeb6c MH |
1494 | (hcon->le_conn_interval < hcon->le_conn_min_interval || |
1495 | hcon->le_conn_interval > hcon->le_conn_max_interval)) { | |
1496 | struct l2cap_conn_param_update_req req; | |
1497 | ||
1498 | req.min = cpu_to_le16(hcon->le_conn_min_interval); | |
1499 | req.max = cpu_to_le16(hcon->le_conn_max_interval); | |
1500 | req.latency = cpu_to_le16(hcon->le_conn_latency); | |
1501 | req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout); | |
1502 | ||
1503 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
1504 | L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req); | |
1505 | } | |
b62f328b VT |
1506 | } |
1507 | ||
4e8402a3 MH |
1508 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1509 | { | |
48454079 | 1510 | struct l2cap_chan *chan; |
cc110922 | 1511 | struct hci_conn *hcon = conn->hcon; |
4e8402a3 | 1512 | |
79d554a6 | 1513 | BT_DBG("conn %p", conn); |
4e8402a3 | 1514 | |
aeaeb4bb JH |
1515 | if (hcon->type == ACL_LINK) |
1516 | l2cap_request_info(conn); | |
1517 | ||
e760ec12 JH |
1518 | mutex_lock(&conn->chan_lock); |
1519 | ||
3df91ea2 | 1520 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1521 | |
6be36555 | 1522 | l2cap_chan_lock(chan); |
4e8402a3 | 1523 | |
2338a7e0 | 1524 | if (chan->scid == L2CAP_CID_A2MP) { |
416fa752 AE |
1525 | l2cap_chan_unlock(chan); |
1526 | continue; | |
1527 | } | |
1528 | ||
cc110922 | 1529 | if (hcon->type == LE_LINK) { |
f1496dee | 1530 | l2cap_le_start(chan); |
63128451 | 1531 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
aeaeb4bb JH |
1532 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
1533 | l2cap_chan_ready(chan); | |
1c244f79 | 1534 | } else if (chan->state == BT_CONNECT) { |
fc7f8a7e | 1535 | l2cap_do_start(chan); |
1c244f79 | 1536 | } |
4e8402a3 | 1537 | |
6be36555 | 1538 | l2cap_chan_unlock(chan); |
4e8402a3 | 1539 | } |
79d554a6 | 1540 | |
3df91ea2 | 1541 | mutex_unlock(&conn->chan_lock); |
61a939c6 | 1542 | |
79a05727 JH |
1543 | if (hcon->type == LE_LINK) |
1544 | l2cap_le_conn_ready(conn); | |
1545 | ||
61a939c6 | 1546 | queue_work(hcon->hdev->workqueue, &conn->pending_rx_work); |
4e8402a3 MH |
1547 | } |
1548 | ||
1549 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1550 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1551 | { | |
48454079 | 1552 | struct l2cap_chan *chan; |
4e8402a3 MH |
1553 | |
1554 | BT_DBG("conn %p", conn); | |
1555 | ||
3df91ea2 | 1556 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1557 | |
3df91ea2 | 1558 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1559 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1d8b1fd5 | 1560 | l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1561 | } |
1562 | ||
3df91ea2 | 1563 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1564 | } |
1565 | ||
f878fcad | 1566 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1567 | { |
f878fcad | 1568 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
2d792818 | 1569 | info_timer.work); |
4e8402a3 | 1570 | |
984947dc | 1571 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1572 | conn->info_ident = 0; |
984947dc | 1573 | |
4e8402a3 MH |
1574 | l2cap_conn_start(conn); |
1575 | } | |
1576 | ||
2c8e1411 DH |
1577 | /* |
1578 | * l2cap_user | |
1579 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe | |
1580 | * callback is called during registration. The ->remove callback is called | |
1581 | * during unregistration. | |
1582 | * An l2cap_user object can either be explicitly unregistered or when the | |
1583 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, | |
1584 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. | |
1585 | * External modules must own a reference to the l2cap_conn object if they intend | |
1586 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at | |
1587 | * any time if they don't. | |
1588 | */ | |
1589 | ||
1590 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1591 | { | |
1592 | struct hci_dev *hdev = conn->hcon->hdev; | |
1593 | int ret; | |
1594 | ||
1595 | /* We need to check whether l2cap_conn is registered. If it is not, we | |
1596 | * must not register the l2cap_user. l2cap_conn_del() is unregisters | |
1597 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it | |
1598 | * relies on the parent hci_conn object to be locked. This itself relies | |
1599 | * on the hci_dev object to be locked. So we must lock the hci device | |
1600 | * here, too. */ | |
1601 | ||
1602 | hci_dev_lock(hdev); | |
1603 | ||
1604 | if (user->list.next || user->list.prev) { | |
1605 | ret = -EINVAL; | |
1606 | goto out_unlock; | |
1607 | } | |
1608 | ||
1609 | /* conn->hchan is NULL after l2cap_conn_del() was called */ | |
1610 | if (!conn->hchan) { | |
1611 | ret = -ENODEV; | |
1612 | goto out_unlock; | |
1613 | } | |
1614 | ||
1615 | ret = user->probe(conn, user); | |
1616 | if (ret) | |
1617 | goto out_unlock; | |
1618 | ||
1619 | list_add(&user->list, &conn->users); | |
1620 | ret = 0; | |
1621 | ||
1622 | out_unlock: | |
1623 | hci_dev_unlock(hdev); | |
1624 | return ret; | |
1625 | } | |
1626 | EXPORT_SYMBOL(l2cap_register_user); | |
1627 | ||
1628 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) | |
1629 | { | |
1630 | struct hci_dev *hdev = conn->hcon->hdev; | |
1631 | ||
1632 | hci_dev_lock(hdev); | |
1633 | ||
1634 | if (!user->list.next || !user->list.prev) | |
1635 | goto out_unlock; | |
1636 | ||
1637 | list_del(&user->list); | |
1638 | user->list.next = NULL; | |
1639 | user->list.prev = NULL; | |
1640 | user->remove(conn, user); | |
1641 | ||
1642 | out_unlock: | |
1643 | hci_dev_unlock(hdev); | |
1644 | } | |
1645 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1646 | ||
1647 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1648 | { | |
1649 | struct l2cap_user *user; | |
1650 | ||
1651 | while (!list_empty(&conn->users)) { | |
1652 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
1653 | list_del(&user->list); | |
1654 | user->list.next = NULL; | |
1655 | user->list.prev = NULL; | |
1656 | user->remove(conn, user); | |
1657 | } | |
1658 | } | |
1659 | ||
5d3de7df VCG |
1660 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1661 | { | |
1662 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1663 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1664 | |
1665 | if (!conn) | |
1666 | return; | |
1667 | ||
1668 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1669 | ||
1670 | kfree_skb(conn->rx_skb); | |
1671 | ||
61a939c6 | 1672 | skb_queue_purge(&conn->pending_rx); |
7ab56c3a JT |
1673 | |
1674 | /* We can not call flush_work(&conn->pending_rx_work) here since we | |
1675 | * might block if we are running on a worker from the same workqueue | |
1676 | * pending_rx_work is waiting on. | |
1677 | */ | |
1678 | if (work_pending(&conn->pending_rx_work)) | |
1679 | cancel_work_sync(&conn->pending_rx_work); | |
61a939c6 | 1680 | |
f3d82d0c JH |
1681 | if (work_pending(&conn->id_addr_update_work)) |
1682 | cancel_work_sync(&conn->id_addr_update_work); | |
1683 | ||
2c8e1411 DH |
1684 | l2cap_unregister_all_users(conn); |
1685 | ||
e31fb860 JH |
1686 | /* Force the connection to be immediately dropped */ |
1687 | hcon->disc_timeout = 0; | |
1688 | ||
3df91ea2 AE |
1689 | mutex_lock(&conn->chan_lock); |
1690 | ||
5d3de7df VCG |
1691 | /* Kill channels */ |
1692 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1693 | l2cap_chan_hold(chan); |
6be36555 AE |
1694 | l2cap_chan_lock(chan); |
1695 | ||
5d3de7df | 1696 | l2cap_chan_del(chan, err); |
6be36555 AE |
1697 | |
1698 | l2cap_chan_unlock(chan); | |
1699 | ||
80b98027 | 1700 | chan->ops->close(chan); |
61d6ef3e | 1701 | l2cap_chan_put(chan); |
5d3de7df VCG |
1702 | } |
1703 | ||
3df91ea2 AE |
1704 | mutex_unlock(&conn->chan_lock); |
1705 | ||
73d80deb LAD |
1706 | hci_chan_del(conn->hchan); |
1707 | ||
5d3de7df | 1708 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1709 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1710 | |
5d3de7df | 1711 | hcon->l2cap_data = NULL; |
9c903e37 DH |
1712 | conn->hchan = NULL; |
1713 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1714 | } |
1715 | ||
9c903e37 DH |
1716 | static void l2cap_conn_free(struct kref *ref) |
1717 | { | |
1718 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1719 | ||
1720 | hci_conn_put(conn->hcon); | |
1721 | kfree(conn); | |
1722 | } | |
1723 | ||
51bb8457 | 1724 | struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn) |
9c903e37 DH |
1725 | { |
1726 | kref_get(&conn->ref); | |
51bb8457 | 1727 | return conn; |
9c903e37 DH |
1728 | } |
1729 | EXPORT_SYMBOL(l2cap_conn_get); | |
1730 | ||
1731 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1732 | { | |
1733 | kref_put(&conn->ref, l2cap_conn_free); | |
1734 | } | |
1735 | EXPORT_SYMBOL(l2cap_conn_put); | |
1736 | ||
1da177e4 | 1737 | /* ---- Socket interface ---- */ |
1da177e4 | 1738 | |
c2287681 | 1739 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1740 | * Returns closest match. |
1741 | */ | |
c2287681 IY |
1742 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1743 | bdaddr_t *src, | |
bf20fd4e JH |
1744 | bdaddr_t *dst, |
1745 | u8 link_type) | |
1da177e4 | 1746 | { |
23691d75 | 1747 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1748 | |
23691d75 | 1749 | read_lock(&chan_list_lock); |
e0f0cb56 | 1750 | |
23691d75 | 1751 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1752 | if (state && c->state != state) |
1da177e4 LT |
1753 | continue; |
1754 | ||
bf20fd4e JH |
1755 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1756 | continue; | |
1757 | ||
1758 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
1759 | continue; | |
1760 | ||
23691d75 | 1761 | if (c->psm == psm) { |
c2287681 IY |
1762 | int src_match, dst_match; |
1763 | int src_any, dst_any; | |
1764 | ||
1da177e4 | 1765 | /* Exact match. */ |
7eafc59e MH |
1766 | src_match = !bacmp(&c->src, src); |
1767 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1768 | if (src_match && dst_match) { |
a24cce14 | 1769 | l2cap_chan_hold(c); |
a7567b20 | 1770 | read_unlock(&chan_list_lock); |
23691d75 GP |
1771 | return c; |
1772 | } | |
1da177e4 LT |
1773 | |
1774 | /* Closest match */ | |
7eafc59e MH |
1775 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1776 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1777 | if ((src_match && dst_any) || (src_any && dst_match) || |
1778 | (src_any && dst_any)) | |
23691d75 | 1779 | c1 = c; |
1da177e4 LT |
1780 | } |
1781 | } | |
1da177e4 | 1782 | |
a24cce14 JH |
1783 | if (c1) |
1784 | l2cap_chan_hold(c1); | |
1785 | ||
23691d75 | 1786 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1787 | |
23691d75 | 1788 | return c1; |
1da177e4 LT |
1789 | } |
1790 | ||
721c4181 | 1791 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1792 | { |
721c4181 | 1793 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1794 | monitor_timer.work); |
e90bac06 | 1795 | |
525cd185 | 1796 | BT_DBG("chan %p", chan); |
0e98958d | 1797 | |
6be36555 AE |
1798 | l2cap_chan_lock(chan); |
1799 | ||
80909e04 | 1800 | if (!chan->conn) { |
6be36555 | 1801 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1802 | l2cap_chan_put(chan); |
e90bac06 GP |
1803 | return; |
1804 | } | |
1805 | ||
401bb1f7 | 1806 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1807 | |
6be36555 | 1808 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1809 | l2cap_chan_put(chan); |
e90bac06 GP |
1810 | } |
1811 | ||
721c4181 | 1812 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1813 | { |
721c4181 | 1814 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1815 | retrans_timer.work); |
e90bac06 | 1816 | |
49208c9c | 1817 | BT_DBG("chan %p", chan); |
0e98958d | 1818 | |
6be36555 AE |
1819 | l2cap_chan_lock(chan); |
1820 | ||
80909e04 MM |
1821 | if (!chan->conn) { |
1822 | l2cap_chan_unlock(chan); | |
1823 | l2cap_chan_put(chan); | |
1824 | return; | |
1825 | } | |
6be36555 | 1826 | |
401bb1f7 | 1827 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1828 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1829 | l2cap_chan_put(chan); |
e90bac06 GP |
1830 | } |
1831 | ||
d660366d GP |
1832 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1833 | struct sk_buff_head *skbs) | |
6840ed07 | 1834 | { |
ccbb84af | 1835 | struct sk_buff *skb; |
3733937d | 1836 | struct l2cap_ctrl *control; |
6840ed07 | 1837 | |
3733937d MM |
1838 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1839 | ||
b99e13ad MM |
1840 | if (__chan_is_moving(chan)) |
1841 | return; | |
1842 | ||
3733937d MM |
1843 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1844 | ||
1845 | while (!skb_queue_empty(&chan->tx_q)) { | |
1846 | ||
1847 | skb = skb_dequeue(&chan->tx_q); | |
1848 | ||
a4368ff3 JH |
1849 | bt_cb(skb)->l2cap.retries = 1; |
1850 | control = &bt_cb(skb)->l2cap; | |
3733937d MM |
1851 | |
1852 | control->reqseq = 0; | |
1853 | control->txseq = chan->next_tx_seq; | |
1854 | ||
1855 | __pack_control(chan, control, skb); | |
6840ed07 | 1856 | |
47d1ec61 | 1857 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1858 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1859 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1860 | } |
1861 | ||
4343478f | 1862 | l2cap_do_send(chan, skb); |
6840ed07 | 1863 | |
b4400672 | 1864 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1865 | |
836be934 | 1866 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1867 | chan->frames_sent++; |
6840ed07 | 1868 | } |
6840ed07 GP |
1869 | } |
1870 | ||
67c9e840 | 1871 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1872 | { |
1873 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1874 | struct l2cap_ctrl *control; |
1875 | int sent = 0; | |
1876 | ||
1877 | BT_DBG("chan %p", chan); | |
1c2acffb | 1878 | |
89bc500e | 1879 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1880 | return -ENOTCONN; |
e90bac06 | 1881 | |
94122bbe MM |
1882 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1883 | return 0; | |
1884 | ||
b99e13ad MM |
1885 | if (__chan_is_moving(chan)) |
1886 | return 0; | |
1887 | ||
18a48e76 MM |
1888 | while (chan->tx_send_head && |
1889 | chan->unacked_frames < chan->remote_tx_win && | |
1890 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1891 | |
18a48e76 | 1892 | skb = chan->tx_send_head; |
e90bac06 | 1893 | |
a4368ff3 JH |
1894 | bt_cb(skb)->l2cap.retries = 1; |
1895 | control = &bt_cb(skb)->l2cap; | |
95ffa978 | 1896 | |
e2ab4353 | 1897 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1898 | control->final = 1; |
e2ab4353 | 1899 | |
18a48e76 MM |
1900 | control->reqseq = chan->buffer_seq; |
1901 | chan->last_acked_seq = chan->buffer_seq; | |
1902 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1903 | |
18a48e76 | 1904 | __pack_control(chan, control, skb); |
e90bac06 | 1905 | |
47d1ec61 | 1906 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1907 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1908 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1909 | } |
1910 | ||
18a48e76 MM |
1911 | /* Clone after data has been modified. Data is assumed to be |
1912 | read-only (for locking purposes) on cloned sk_buffs. | |
1913 | */ | |
1914 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1915 | |
18a48e76 MM |
1916 | if (!tx_skb) |
1917 | break; | |
1c2acffb | 1918 | |
18a48e76 | 1919 | __set_retrans_timer(chan); |
836be934 AE |
1920 | |
1921 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1922 | chan->unacked_frames++; |
6a026610 | 1923 | chan->frames_sent++; |
18a48e76 | 1924 | sent++; |
1c2acffb | 1925 | |
58d35f87 GP |
1926 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1927 | chan->tx_send_head = NULL; | |
1c2acffb | 1928 | else |
58d35f87 | 1929 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1930 | |
1931 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1932 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1933 | } |
1934 | ||
b4400672 AE |
1935 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1936 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1937 | |
1938 | return sent; | |
9e917af1 GP |
1939 | } |
1940 | ||
e1fbd4c1 MM |
1941 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1942 | { | |
1943 | struct l2cap_ctrl control; | |
1944 | struct sk_buff *skb; | |
1945 | struct sk_buff *tx_skb; | |
1946 | u16 seq; | |
1947 | ||
1948 | BT_DBG("chan %p", chan); | |
1949 | ||
1950 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1951 | return; | |
1952 | ||
b99e13ad MM |
1953 | if (__chan_is_moving(chan)) |
1954 | return; | |
1955 | ||
e1fbd4c1 MM |
1956 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
1957 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1958 | ||
1959 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1960 | if (!skb) { | |
1961 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1962 | seq); |
e1fbd4c1 MM |
1963 | continue; |
1964 | } | |
1965 | ||
a4368ff3 JH |
1966 | bt_cb(skb)->l2cap.retries++; |
1967 | control = bt_cb(skb)->l2cap; | |
e1fbd4c1 MM |
1968 | |
1969 | if (chan->max_tx != 0 && | |
a4368ff3 | 1970 | bt_cb(skb)->l2cap.retries > chan->max_tx) { |
e1fbd4c1 | 1971 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
5e4e3972 | 1972 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
1973 | l2cap_seq_list_clear(&chan->retrans_list); |
1974 | break; | |
1975 | } | |
1976 | ||
1977 | control.reqseq = chan->buffer_seq; | |
1978 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1979 | control.final = 1; | |
1980 | else | |
1981 | control.final = 0; | |
1982 | ||
1983 | if (skb_cloned(skb)) { | |
1984 | /* Cloned sk_buffs are read-only, so we need a | |
1985 | * writeable copy | |
1986 | */ | |
8bcde1f2 | 1987 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1988 | } else { |
8bcde1f2 | 1989 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1990 | } |
1991 | ||
1992 | if (!tx_skb) { | |
1993 | l2cap_seq_list_clear(&chan->retrans_list); | |
1994 | break; | |
1995 | } | |
1996 | ||
1997 | /* Update skb contents */ | |
1998 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1999 | put_unaligned_le32(__pack_extended_control(&control), | |
2000 | tx_skb->data + L2CAP_HDR_SIZE); | |
2001 | } else { | |
2002 | put_unaligned_le16(__pack_enhanced_control(&control), | |
2003 | tx_skb->data + L2CAP_HDR_SIZE); | |
2004 | } | |
2005 | ||
13cac152 | 2006 | /* Update FCS */ |
e1fbd4c1 | 2007 | if (chan->fcs == L2CAP_FCS_CRC16) { |
13cac152 LR |
2008 | u16 fcs = crc16(0, (u8 *) tx_skb->data, |
2009 | tx_skb->len - L2CAP_FCS_SIZE); | |
2010 | put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) - | |
2011 | L2CAP_FCS_SIZE); | |
e1fbd4c1 MM |
2012 | } |
2013 | ||
2014 | l2cap_do_send(chan, tx_skb); | |
2015 | ||
2016 | BT_DBG("Resent txseq %d", control.txseq); | |
2017 | ||
2018 | chan->last_acked_seq = chan->buffer_seq; | |
2019 | } | |
2020 | } | |
2021 | ||
f80842a8 MM |
2022 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2023 | struct l2cap_ctrl *control) | |
2024 | { | |
2025 | BT_DBG("chan %p, control %p", chan, control); | |
2026 | ||
2027 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2028 | l2cap_ertm_resend(chan); | |
2029 | } | |
2030 | ||
d2a7ac5d MM |
2031 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2032 | struct l2cap_ctrl *control) | |
2033 | { | |
e1fbd4c1 MM |
2034 | struct sk_buff *skb; |
2035 | ||
2036 | BT_DBG("chan %p, control %p", chan, control); | |
2037 | ||
2038 | if (control->poll) | |
2039 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2040 | ||
2041 | l2cap_seq_list_clear(&chan->retrans_list); | |
2042 | ||
2043 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2044 | return; | |
2045 | ||
2046 | if (chan->unacked_frames) { | |
2047 | skb_queue_walk(&chan->tx_q, skb) { | |
a4368ff3 | 2048 | if (bt_cb(skb)->l2cap.txseq == control->reqseq || |
2d792818 | 2049 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2050 | break; |
2051 | } | |
2052 | ||
2053 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2054 | if (skb == chan->tx_send_head) | |
2055 | break; | |
2056 | ||
2057 | l2cap_seq_list_append(&chan->retrans_list, | |
a4368ff3 | 2058 | bt_cb(skb)->l2cap.txseq); |
e1fbd4c1 MM |
2059 | } |
2060 | ||
2061 | l2cap_ertm_resend(chan); | |
2062 | } | |
d2a7ac5d MM |
2063 | } |
2064 | ||
0a0aba42 | 2065 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2066 | { |
0a0aba42 MM |
2067 | struct l2cap_ctrl control; |
2068 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2069 | chan->last_acked_seq); | |
2070 | int threshold; | |
9e917af1 | 2071 | |
0a0aba42 MM |
2072 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2073 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2074 | |
0a0aba42 MM |
2075 | memset(&control, 0, sizeof(control)); |
2076 | control.sframe = 1; | |
dfc909be | 2077 | |
0a0aba42 MM |
2078 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2079 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2080 | __clear_ack_timer(chan); | |
2081 | control.super = L2CAP_SUPER_RNR; | |
2082 | control.reqseq = chan->buffer_seq; | |
2083 | l2cap_send_sframe(chan, &control); | |
2084 | } else { | |
2085 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2086 | l2cap_ertm_send(chan); | |
2087 | /* If any i-frames were sent, they included an ack */ | |
2088 | if (chan->buffer_seq == chan->last_acked_seq) | |
2089 | frames_to_ack = 0; | |
2090 | } | |
dfc909be | 2091 | |
c20f8e35 | 2092 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2093 | * Calculate without mul or div |
2094 | */ | |
c20f8e35 | 2095 | threshold = chan->ack_win; |
0a0aba42 MM |
2096 | threshold += threshold << 1; |
2097 | threshold >>= 2; | |
2098 | ||
b4400672 | 2099 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2100 | threshold); |
2101 | ||
2102 | if (frames_to_ack >= threshold) { | |
2103 | __clear_ack_timer(chan); | |
2104 | control.super = L2CAP_SUPER_RR; | |
2105 | control.reqseq = chan->buffer_seq; | |
2106 | l2cap_send_sframe(chan, &control); | |
2107 | frames_to_ack = 0; | |
2108 | } | |
1c2acffb | 2109 | |
0a0aba42 MM |
2110 | if (frames_to_ack) |
2111 | __set_ack_timer(chan); | |
2112 | } | |
b17e73bb SJ |
2113 | } |
2114 | ||
04124681 GP |
2115 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2116 | struct msghdr *msg, int len, | |
2117 | int count, struct sk_buff *skb) | |
1c2acffb | 2118 | { |
0952a57a | 2119 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2120 | struct sk_buff **frag; |
90338947 | 2121 | int sent = 0; |
1da177e4 | 2122 | |
17836394 | 2123 | if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count) |
1c2acffb | 2124 | return -EFAULT; |
1da177e4 LT |
2125 | |
2126 | sent += count; | |
2127 | len -= count; | |
2128 | ||
2129 | /* Continuation fragments (no L2CAP header) */ | |
2130 | frag = &skb_shinfo(skb)->frag_list; | |
2131 | while (len) { | |
fbe00700 GP |
2132 | struct sk_buff *tmp; |
2133 | ||
1da177e4 LT |
2134 | count = min_t(unsigned int, conn->mtu, len); |
2135 | ||
d9fbd02b | 2136 | tmp = chan->ops->alloc_skb(chan, 0, count, |
fbe00700 GP |
2137 | msg->msg_flags & MSG_DONTWAIT); |
2138 | if (IS_ERR(tmp)) | |
2139 | return PTR_ERR(tmp); | |
2140 | ||
2141 | *frag = tmp; | |
2f7719ce | 2142 | |
17836394 AV |
2143 | if (copy_from_iter(skb_put(*frag, count), count, |
2144 | &msg->msg_iter) != count) | |
1c2acffb | 2145 | return -EFAULT; |
1da177e4 LT |
2146 | |
2147 | sent += count; | |
2148 | len -= count; | |
2149 | ||
2d0ed3d5 GP |
2150 | skb->len += (*frag)->len; |
2151 | skb->data_len += (*frag)->len; | |
2152 | ||
1da177e4 LT |
2153 | frag = &(*frag)->next; |
2154 | } | |
1da177e4 LT |
2155 | |
2156 | return sent; | |
1c2acffb | 2157 | } |
1da177e4 | 2158 | |
5e59b791 | 2159 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
8d46321c | 2160 | struct msghdr *msg, size_t len) |
1c2acffb | 2161 | { |
8c1d787b | 2162 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2163 | struct sk_buff *skb; |
03a51213 | 2164 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2165 | struct l2cap_hdr *lh; |
2166 | ||
8d46321c MH |
2167 | BT_DBG("chan %p psm 0x%2.2x len %zu", chan, |
2168 | __le16_to_cpu(chan->psm), len); | |
1c2acffb GP |
2169 | |
2170 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce | 2171 | |
d9fbd02b | 2172 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2173 | msg->msg_flags & MSG_DONTWAIT); |
2174 | if (IS_ERR(skb)) | |
2175 | return skb; | |
1c2acffb GP |
2176 | |
2177 | /* Create L2CAP header */ | |
2178 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2179 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2180 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2181 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2182 | |
0952a57a | 2183 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2184 | if (unlikely(err < 0)) { |
2185 | kfree_skb(skb); | |
2186 | return ERR_PTR(err); | |
2187 | } | |
2188 | return skb; | |
2189 | } | |
2190 | ||
5e59b791 | 2191 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
8d46321c | 2192 | struct msghdr *msg, size_t len) |
1c2acffb | 2193 | { |
8c1d787b | 2194 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2195 | struct sk_buff *skb; |
f2ba7fae | 2196 | int err, count; |
1c2acffb GP |
2197 | struct l2cap_hdr *lh; |
2198 | ||
b4400672 | 2199 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2200 | |
f2ba7fae | 2201 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2202 | |
d9fbd02b | 2203 | skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, |
90338947 GP |
2204 | msg->msg_flags & MSG_DONTWAIT); |
2205 | if (IS_ERR(skb)) | |
2206 | return skb; | |
1c2acffb GP |
2207 | |
2208 | /* Create L2CAP header */ | |
2209 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2210 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2211 | lh->len = cpu_to_le16(len); |
1c2acffb | 2212 | |
0952a57a | 2213 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2214 | if (unlikely(err < 0)) { |
2215 | kfree_skb(skb); | |
2216 | return ERR_PTR(err); | |
2217 | } | |
2218 | return skb; | |
2219 | } | |
2220 | ||
ab0ff76d | 2221 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2222 | struct msghdr *msg, size_t len, |
2223 | u16 sdulen) | |
1c2acffb | 2224 | { |
8c1d787b | 2225 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2226 | struct sk_buff *skb; |
e4ca6d98 | 2227 | int err, count, hlen; |
1c2acffb GP |
2228 | struct l2cap_hdr *lh; |
2229 | ||
b4400672 | 2230 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2231 | |
0ee0d208 GP |
2232 | if (!conn) |
2233 | return ERR_PTR(-ENOTCONN); | |
2234 | ||
ba7aa64f | 2235 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2236 | |
c74e560c | 2237 | if (sdulen) |
03a51213 | 2238 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2239 | |
47d1ec61 | 2240 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2241 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2242 | |
1c2acffb | 2243 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce | 2244 | |
d9fbd02b | 2245 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2246 | msg->msg_flags & MSG_DONTWAIT); |
2247 | if (IS_ERR(skb)) | |
2248 | return skb; | |
1c2acffb GP |
2249 | |
2250 | /* Create L2CAP header */ | |
2251 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2252 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2253 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2254 | |
18a48e76 MM |
2255 | /* Control header is populated later */ |
2256 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2257 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2258 | else | |
2259 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2260 | |
c74e560c | 2261 | if (sdulen) |
03a51213 | 2262 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2263 | |
0952a57a | 2264 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2265 | if (unlikely(err < 0)) { |
2266 | kfree_skb(skb); | |
2267 | return ERR_PTR(err); | |
2268 | } | |
e90bac06 | 2269 | |
a4368ff3 JH |
2270 | bt_cb(skb)->l2cap.fcs = chan->fcs; |
2271 | bt_cb(skb)->l2cap.retries = 0; | |
1c2acffb | 2272 | return skb; |
1da177e4 LT |
2273 | } |
2274 | ||
94122bbe MM |
2275 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2276 | struct sk_buff_head *seg_queue, | |
2277 | struct msghdr *msg, size_t len) | |
c74e560c | 2278 | { |
c74e560c | 2279 | struct sk_buff *skb; |
94122bbe MM |
2280 | u16 sdu_len; |
2281 | size_t pdu_len; | |
94122bbe | 2282 | u8 sar; |
c74e560c | 2283 | |
b4400672 | 2284 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2285 | |
94122bbe MM |
2286 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2287 | * so fragmented skbs are not used. The HCI layer's handling | |
2288 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2289 | */ | |
c74e560c | 2290 | |
94122bbe MM |
2291 | /* PDU size is derived from the HCI MTU */ |
2292 | pdu_len = chan->conn->mtu; | |
c74e560c | 2293 | |
a549574d MM |
2294 | /* Constrain PDU size for BR/EDR connections */ |
2295 | if (!chan->hs_hcon) | |
2296 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2297 | |
2298 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2299 | if (chan->fcs) |
2300 | pdu_len -= L2CAP_FCS_SIZE; | |
2301 | ||
ba7aa64f | 2302 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2303 | |
2304 | /* Remote device may have requested smaller PDUs */ | |
2305 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2306 | ||
2307 | if (len <= pdu_len) { | |
2308 | sar = L2CAP_SAR_UNSEGMENTED; | |
2309 | sdu_len = 0; | |
2310 | pdu_len = len; | |
2311 | } else { | |
2312 | sar = L2CAP_SAR_START; | |
2313 | sdu_len = len; | |
94122bbe MM |
2314 | } |
2315 | ||
2316 | while (len > 0) { | |
2317 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2318 | |
c74e560c | 2319 | if (IS_ERR(skb)) { |
94122bbe | 2320 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2321 | return PTR_ERR(skb); |
2322 | } | |
2323 | ||
a4368ff3 | 2324 | bt_cb(skb)->l2cap.sar = sar; |
94122bbe MM |
2325 | __skb_queue_tail(seg_queue, skb); |
2326 | ||
2327 | len -= pdu_len; | |
069cb270 | 2328 | if (sdu_len) |
94122bbe | 2329 | sdu_len = 0; |
94122bbe MM |
2330 | |
2331 | if (len <= pdu_len) { | |
2332 | sar = L2CAP_SAR_END; | |
2333 | pdu_len = len; | |
2334 | } else { | |
2335 | sar = L2CAP_SAR_CONTINUE; | |
2336 | } | |
c74e560c | 2337 | } |
c74e560c | 2338 | |
f0f62799 | 2339 | return 0; |
c74e560c GP |
2340 | } |
2341 | ||
177f8f2b JH |
2342 | static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, |
2343 | struct msghdr *msg, | |
2344 | size_t len, u16 sdulen) | |
2345 | { | |
2346 | struct l2cap_conn *conn = chan->conn; | |
2347 | struct sk_buff *skb; | |
2348 | int err, count, hlen; | |
2349 | struct l2cap_hdr *lh; | |
2350 | ||
2351 | BT_DBG("chan %p len %zu", chan, len); | |
2352 | ||
2353 | if (!conn) | |
2354 | return ERR_PTR(-ENOTCONN); | |
2355 | ||
2356 | hlen = L2CAP_HDR_SIZE; | |
2357 | ||
2358 | if (sdulen) | |
2359 | hlen += L2CAP_SDULEN_SIZE; | |
2360 | ||
2361 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2362 | ||
d9fbd02b | 2363 | skb = chan->ops->alloc_skb(chan, hlen, count, |
177f8f2b JH |
2364 | msg->msg_flags & MSG_DONTWAIT); |
2365 | if (IS_ERR(skb)) | |
2366 | return skb; | |
2367 | ||
2368 | /* Create L2CAP header */ | |
2369 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
2370 | lh->cid = cpu_to_le16(chan->dcid); | |
2371 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
2372 | ||
2373 | if (sdulen) | |
2374 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); | |
2375 | ||
2376 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); | |
2377 | if (unlikely(err < 0)) { | |
2378 | kfree_skb(skb); | |
2379 | return ERR_PTR(err); | |
2380 | } | |
2381 | ||
2382 | return skb; | |
2383 | } | |
2384 | ||
2385 | static int l2cap_segment_le_sdu(struct l2cap_chan *chan, | |
2386 | struct sk_buff_head *seg_queue, | |
2387 | struct msghdr *msg, size_t len) | |
2388 | { | |
2389 | struct sk_buff *skb; | |
2390 | size_t pdu_len; | |
2391 | u16 sdu_len; | |
2392 | ||
2393 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); | |
2394 | ||
177f8f2b | 2395 | sdu_len = len; |
72c6fb91 | 2396 | pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE; |
177f8f2b JH |
2397 | |
2398 | while (len > 0) { | |
2399 | if (len <= pdu_len) | |
2400 | pdu_len = len; | |
2401 | ||
2402 | skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); | |
2403 | if (IS_ERR(skb)) { | |
2404 | __skb_queue_purge(seg_queue); | |
2405 | return PTR_ERR(skb); | |
2406 | } | |
2407 | ||
2408 | __skb_queue_tail(seg_queue, skb); | |
2409 | ||
2410 | len -= pdu_len; | |
2411 | ||
2412 | if (sdu_len) { | |
2413 | sdu_len = 0; | |
2414 | pdu_len += L2CAP_SDULEN_SIZE; | |
2415 | } | |
2416 | } | |
2417 | ||
2418 | return 0; | |
2419 | } | |
2420 | ||
8d46321c | 2421 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
9a91a04a | 2422 | { |
9a91a04a | 2423 | struct sk_buff *skb; |
9a91a04a | 2424 | int err; |
94122bbe | 2425 | struct sk_buff_head seg_queue; |
9a91a04a | 2426 | |
31e8ce80 SWK |
2427 | if (!chan->conn) |
2428 | return -ENOTCONN; | |
2429 | ||
9a91a04a | 2430 | /* Connectionless channel */ |
715ec005 | 2431 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
8d46321c | 2432 | skb = l2cap_create_connless_pdu(chan, msg, len); |
9a91a04a GP |
2433 | if (IS_ERR(skb)) |
2434 | return PTR_ERR(skb); | |
2435 | ||
ede81a2a AK |
2436 | /* Channel lock is released before requesting new skb and then |
2437 | * reacquired thus we need to recheck channel state. | |
2438 | */ | |
2439 | if (chan->state != BT_CONNECTED) { | |
2440 | kfree_skb(skb); | |
2441 | return -ENOTCONN; | |
2442 | } | |
2443 | ||
9a91a04a GP |
2444 | l2cap_do_send(chan, skb); |
2445 | return len; | |
2446 | } | |
2447 | ||
2448 | switch (chan->mode) { | |
38319713 | 2449 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b JH |
2450 | /* Check outgoing MTU */ |
2451 | if (len > chan->omtu) | |
2452 | return -EMSGSIZE; | |
2453 | ||
fad5fc89 JH |
2454 | if (!chan->tx_credits) |
2455 | return -EAGAIN; | |
2456 | ||
177f8f2b JH |
2457 | __skb_queue_head_init(&seg_queue); |
2458 | ||
2459 | err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); | |
2460 | ||
2461 | if (chan->state != BT_CONNECTED) { | |
2462 | __skb_queue_purge(&seg_queue); | |
2463 | err = -ENOTCONN; | |
2464 | } | |
2465 | ||
2466 | if (err) | |
2467 | return err; | |
2468 | ||
2469 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); | |
2470 | ||
2471 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
2472 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
2473 | chan->tx_credits--; | |
2474 | } | |
2475 | ||
2476 | if (!chan->tx_credits) | |
2477 | chan->ops->suspend(chan); | |
2478 | ||
2479 | err = len; | |
2480 | ||
2481 | break; | |
2482 | ||
fad5fc89 | 2483 | case L2CAP_MODE_BASIC: |
9a91a04a GP |
2484 | /* Check outgoing MTU */ |
2485 | if (len > chan->omtu) | |
2486 | return -EMSGSIZE; | |
2487 | ||
2488 | /* Create a basic PDU */ | |
8d46321c | 2489 | skb = l2cap_create_basic_pdu(chan, msg, len); |
9a91a04a GP |
2490 | if (IS_ERR(skb)) |
2491 | return PTR_ERR(skb); | |
2492 | ||
ede81a2a AK |
2493 | /* Channel lock is released before requesting new skb and then |
2494 | * reacquired thus we need to recheck channel state. | |
2495 | */ | |
2496 | if (chan->state != BT_CONNECTED) { | |
2497 | kfree_skb(skb); | |
2498 | return -ENOTCONN; | |
2499 | } | |
2500 | ||
9a91a04a GP |
2501 | l2cap_do_send(chan, skb); |
2502 | err = len; | |
2503 | break; | |
2504 | ||
2505 | case L2CAP_MODE_ERTM: | |
2506 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2507 | /* Check outgoing MTU */ |
2508 | if (len > chan->omtu) { | |
2509 | err = -EMSGSIZE; | |
2510 | break; | |
2511 | } | |
9a91a04a | 2512 | |
94122bbe | 2513 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2514 | |
94122bbe MM |
2515 | /* Do segmentation before calling in to the state machine, |
2516 | * since it's possible to block while waiting for memory | |
2517 | * allocation. | |
2518 | */ | |
2519 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2520 | |
94122bbe MM |
2521 | /* The channel could have been closed while segmenting, |
2522 | * check that it is still connected. | |
2523 | */ | |
2524 | if (chan->state != BT_CONNECTED) { | |
2525 | __skb_queue_purge(&seg_queue); | |
2526 | err = -ENOTCONN; | |
9a91a04a GP |
2527 | } |
2528 | ||
94122bbe | 2529 | if (err) |
9a91a04a | 2530 | break; |
9a91a04a | 2531 | |
3733937d | 2532 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2533 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2534 | else |
d660366d | 2535 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2536 | |
d660366d | 2537 | err = len; |
9a91a04a | 2538 | |
94122bbe MM |
2539 | /* If the skbs were not queued for sending, they'll still be in |
2540 | * seg_queue and need to be purged. | |
2541 | */ | |
2542 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2543 | break; |
2544 | ||
2545 | default: | |
2546 | BT_DBG("bad state %1.1x", chan->mode); | |
2547 | err = -EBADFD; | |
2548 | } | |
2549 | ||
2550 | return err; | |
2551 | } | |
6b8d4a6a | 2552 | EXPORT_SYMBOL_GPL(l2cap_chan_send); |
9a91a04a | 2553 | |
d2a7ac5d MM |
2554 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2555 | { | |
bed68bde MM |
2556 | struct l2cap_ctrl control; |
2557 | u16 seq; | |
2558 | ||
b4400672 | 2559 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2560 | |
2561 | memset(&control, 0, sizeof(control)); | |
2562 | control.sframe = 1; | |
2563 | control.super = L2CAP_SUPER_SREJ; | |
2564 | ||
2565 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2566 | seq = __next_seq(chan, seq)) { | |
2567 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2568 | control.reqseq = seq; | |
2569 | l2cap_send_sframe(chan, &control); | |
2570 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2571 | } | |
2572 | } | |
2573 | ||
2574 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2575 | } |
2576 | ||
2577 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2578 | { | |
bed68bde MM |
2579 | struct l2cap_ctrl control; |
2580 | ||
2581 | BT_DBG("chan %p", chan); | |
2582 | ||
2583 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2584 | return; | |
2585 | ||
2586 | memset(&control, 0, sizeof(control)); | |
2587 | control.sframe = 1; | |
2588 | control.super = L2CAP_SUPER_SREJ; | |
2589 | control.reqseq = chan->srej_list.tail; | |
2590 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2591 | } |
2592 | ||
2593 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2594 | { | |
bed68bde MM |
2595 | struct l2cap_ctrl control; |
2596 | u16 initial_head; | |
2597 | u16 seq; | |
2598 | ||
b4400672 | 2599 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2600 | |
2601 | memset(&control, 0, sizeof(control)); | |
2602 | control.sframe = 1; | |
2603 | control.super = L2CAP_SUPER_SREJ; | |
2604 | ||
2605 | /* Capture initial list head to allow only one pass through the list. */ | |
2606 | initial_head = chan->srej_list.head; | |
2607 | ||
2608 | do { | |
2609 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2610 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2611 | break; | |
2612 | ||
2613 | control.reqseq = seq; | |
2614 | l2cap_send_sframe(chan, &control); | |
2615 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2616 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2617 | } |
2618 | ||
608bcc6d MM |
2619 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2620 | { | |
2621 | struct sk_buff *acked_skb; | |
2622 | u16 ackseq; | |
2623 | ||
b4400672 | 2624 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2625 | |
2626 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2627 | return; | |
2628 | ||
b4400672 | 2629 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2630 | chan->expected_ack_seq, chan->unacked_frames); |
2631 | ||
2632 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2633 | ackseq = __next_seq(chan, ackseq)) { | |
2634 | ||
2635 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2636 | if (acked_skb) { | |
2637 | skb_unlink(acked_skb, &chan->tx_q); | |
2638 | kfree_skb(acked_skb); | |
2639 | chan->unacked_frames--; | |
2640 | } | |
2641 | } | |
2642 | ||
2643 | chan->expected_ack_seq = reqseq; | |
2644 | ||
2645 | if (chan->unacked_frames == 0) | |
2646 | __clear_retrans_timer(chan); | |
2647 | ||
b4400672 | 2648 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2649 | } |
2650 | ||
2651 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2652 | { | |
2653 | BT_DBG("chan %p", chan); | |
2654 | ||
2655 | chan->expected_tx_seq = chan->buffer_seq; | |
2656 | l2cap_seq_list_clear(&chan->srej_list); | |
2657 | skb_queue_purge(&chan->srej_q); | |
2658 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2659 | } | |
2660 | ||
d660366d GP |
2661 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2662 | struct l2cap_ctrl *control, | |
2663 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2664 | { |
608bcc6d MM |
2665 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2666 | event); | |
2667 | ||
2668 | switch (event) { | |
2669 | case L2CAP_EV_DATA_REQUEST: | |
2670 | if (chan->tx_send_head == NULL) | |
2671 | chan->tx_send_head = skb_peek(skbs); | |
2672 | ||
2673 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2674 | l2cap_ertm_send(chan); | |
2675 | break; | |
2676 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2677 | BT_DBG("Enter LOCAL_BUSY"); | |
2678 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2679 | ||
2680 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2681 | /* The SREJ_SENT state must be aborted if we are to | |
2682 | * enter the LOCAL_BUSY state. | |
2683 | */ | |
2684 | l2cap_abort_rx_srej_sent(chan); | |
2685 | } | |
2686 | ||
2687 | l2cap_send_ack(chan); | |
2688 | ||
2689 | break; | |
2690 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2691 | BT_DBG("Exit LOCAL_BUSY"); | |
2692 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2693 | ||
2694 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2695 | struct l2cap_ctrl local_control; | |
2696 | ||
2697 | memset(&local_control, 0, sizeof(local_control)); | |
2698 | local_control.sframe = 1; | |
2699 | local_control.super = L2CAP_SUPER_RR; | |
2700 | local_control.poll = 1; | |
2701 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2702 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2703 | |
2704 | chan->retry_count = 1; | |
2705 | __set_monitor_timer(chan); | |
2706 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2707 | } | |
2708 | break; | |
2709 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2710 | l2cap_process_reqseq(chan, control->reqseq); | |
2711 | break; | |
2712 | case L2CAP_EV_EXPLICIT_POLL: | |
2713 | l2cap_send_rr_or_rnr(chan, 1); | |
2714 | chan->retry_count = 1; | |
2715 | __set_monitor_timer(chan); | |
2716 | __clear_ack_timer(chan); | |
2717 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2718 | break; | |
2719 | case L2CAP_EV_RETRANS_TO: | |
2720 | l2cap_send_rr_or_rnr(chan, 1); | |
2721 | chan->retry_count = 1; | |
2722 | __set_monitor_timer(chan); | |
2723 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2724 | break; | |
2725 | case L2CAP_EV_RECV_FBIT: | |
2726 | /* Nothing to process */ | |
2727 | break; | |
2728 | default: | |
2729 | break; | |
2730 | } | |
608bcc6d MM |
2731 | } |
2732 | ||
d660366d GP |
2733 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2734 | struct l2cap_ctrl *control, | |
2735 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2736 | { |
608bcc6d MM |
2737 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2738 | event); | |
2739 | ||
2740 | switch (event) { | |
2741 | case L2CAP_EV_DATA_REQUEST: | |
2742 | if (chan->tx_send_head == NULL) | |
2743 | chan->tx_send_head = skb_peek(skbs); | |
2744 | /* Queue data, but don't send. */ | |
2745 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2746 | break; | |
2747 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2748 | BT_DBG("Enter LOCAL_BUSY"); | |
2749 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2750 | ||
2751 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2752 | /* The SREJ_SENT state must be aborted if we are to | |
2753 | * enter the LOCAL_BUSY state. | |
2754 | */ | |
2755 | l2cap_abort_rx_srej_sent(chan); | |
2756 | } | |
2757 | ||
2758 | l2cap_send_ack(chan); | |
2759 | ||
2760 | break; | |
2761 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2762 | BT_DBG("Exit LOCAL_BUSY"); | |
2763 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2764 | ||
2765 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2766 | struct l2cap_ctrl local_control; | |
2767 | memset(&local_control, 0, sizeof(local_control)); | |
2768 | local_control.sframe = 1; | |
2769 | local_control.super = L2CAP_SUPER_RR; | |
2770 | local_control.poll = 1; | |
2771 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2772 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2773 | |
2774 | chan->retry_count = 1; | |
2775 | __set_monitor_timer(chan); | |
2776 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2777 | } | |
2778 | break; | |
2779 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2780 | l2cap_process_reqseq(chan, control->reqseq); | |
2781 | ||
2782 | /* Fall through */ | |
2783 | ||
2784 | case L2CAP_EV_RECV_FBIT: | |
2785 | if (control && control->final) { | |
2786 | __clear_monitor_timer(chan); | |
2787 | if (chan->unacked_frames > 0) | |
2788 | __set_retrans_timer(chan); | |
2789 | chan->retry_count = 0; | |
2790 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2791 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2792 | } | |
2793 | break; | |
2794 | case L2CAP_EV_EXPLICIT_POLL: | |
2795 | /* Ignore */ | |
2796 | break; | |
2797 | case L2CAP_EV_MONITOR_TO: | |
2798 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2799 | l2cap_send_rr_or_rnr(chan, 1); | |
2800 | __set_monitor_timer(chan); | |
2801 | chan->retry_count++; | |
2802 | } else { | |
5e4e3972 | 2803 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2804 | } |
2805 | break; | |
2806 | default: | |
2807 | break; | |
2808 | } | |
608bcc6d MM |
2809 | } |
2810 | ||
d660366d GP |
2811 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2812 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2813 | { |
608bcc6d MM |
2814 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2815 | chan, control, skbs, event, chan->tx_state); | |
2816 | ||
2817 | switch (chan->tx_state) { | |
2818 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2819 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2820 | break; |
2821 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2822 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2823 | break; |
2824 | default: | |
2825 | /* Ignore event */ | |
2826 | break; | |
2827 | } | |
608bcc6d MM |
2828 | } |
2829 | ||
4b51dae9 MM |
2830 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2831 | struct l2cap_ctrl *control) | |
2832 | { | |
2833 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2834 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2835 | } |
2836 | ||
f80842a8 MM |
2837 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2838 | struct l2cap_ctrl *control) | |
2839 | { | |
2840 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2841 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2842 | } |
2843 | ||
1da177e4 LT |
2844 | /* Copy frame to all raw sockets on that connection */ |
2845 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2846 | { | |
1da177e4 | 2847 | struct sk_buff *nskb; |
48454079 | 2848 | struct l2cap_chan *chan; |
1da177e4 LT |
2849 | |
2850 | BT_DBG("conn %p", conn); | |
2851 | ||
3df91ea2 | 2852 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2853 | |
3df91ea2 | 2854 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2855 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2856 | continue; |
2857 | ||
7f5396a7 | 2858 | /* Don't send frame to the channel it came from */ |
a4368ff3 | 2859 | if (bt_cb(skb)->l2cap.chan == chan) |
1da177e4 | 2860 | continue; |
7f5396a7 | 2861 | |
8bcde1f2 | 2862 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2863 | if (!nskb) |
1da177e4 | 2864 | continue; |
80b98027 | 2865 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2866 | kfree_skb(nskb); |
2867 | } | |
3d57dc68 | 2868 | |
3df91ea2 | 2869 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2870 | } |
2871 | ||
2872 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2873 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2874 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2875 | { |
2876 | struct sk_buff *skb, **frag; | |
2877 | struct l2cap_cmd_hdr *cmd; | |
2878 | struct l2cap_hdr *lh; | |
2879 | int len, count; | |
2880 | ||
b4400672 AE |
2881 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2882 | conn, code, ident, dlen); | |
1da177e4 | 2883 | |
300b962e AL |
2884 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2885 | return NULL; | |
2886 | ||
1da177e4 LT |
2887 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2888 | count = min_t(unsigned int, conn->mtu, len); | |
2889 | ||
8bcde1f2 | 2890 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2891 | if (!skb) |
2892 | return NULL; | |
2893 | ||
2894 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2895 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2896 | |
2897 | if (conn->hcon->type == LE_LINK) | |
dcf4adbf | 2898 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2899 | else |
dcf4adbf | 2900 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2901 | |
2902 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2903 | cmd->code = code; | |
2904 | cmd->ident = ident; | |
aca3192c | 2905 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2906 | |
2907 | if (dlen) { | |
2908 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2909 | memcpy(skb_put(skb, count), data, count); | |
2910 | data += count; | |
2911 | } | |
2912 | ||
2913 | len -= skb->len; | |
2914 | ||
2915 | /* Continuation fragments (no L2CAP header) */ | |
2916 | frag = &skb_shinfo(skb)->frag_list; | |
2917 | while (len) { | |
2918 | count = min_t(unsigned int, conn->mtu, len); | |
2919 | ||
8bcde1f2 | 2920 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2921 | if (!*frag) |
2922 | goto fail; | |
2923 | ||
2924 | memcpy(skb_put(*frag, count), data, count); | |
2925 | ||
2926 | len -= count; | |
2927 | data += count; | |
2928 | ||
2929 | frag = &(*frag)->next; | |
2930 | } | |
2931 | ||
2932 | return skb; | |
2933 | ||
2934 | fail: | |
2935 | kfree_skb(skb); | |
2936 | return NULL; | |
2937 | } | |
2938 | ||
2d792818 GP |
2939 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2940 | unsigned long *val) | |
1da177e4 LT |
2941 | { |
2942 | struct l2cap_conf_opt *opt = *ptr; | |
2943 | int len; | |
2944 | ||
2945 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2946 | *ptr += len; | |
2947 | ||
2948 | *type = opt->type; | |
2949 | *olen = opt->len; | |
2950 | ||
2951 | switch (opt->len) { | |
2952 | case 1: | |
2953 | *val = *((u8 *) opt->val); | |
2954 | break; | |
2955 | ||
2956 | case 2: | |
bfaaeb3e | 2957 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2958 | break; |
2959 | ||
2960 | case 4: | |
bfaaeb3e | 2961 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2962 | break; |
2963 | ||
2964 | default: | |
2965 | *val = (unsigned long) opt->val; | |
2966 | break; | |
2967 | } | |
2968 | ||
b4400672 | 2969 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2970 | return len; |
2971 | } | |
2972 | ||
1da177e4 LT |
2973 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2974 | { | |
2975 | struct l2cap_conf_opt *opt = *ptr; | |
2976 | ||
b4400672 | 2977 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2978 | |
2979 | opt->type = type; | |
2980 | opt->len = len; | |
2981 | ||
2982 | switch (len) { | |
2983 | case 1: | |
2984 | *((u8 *) opt->val) = val; | |
2985 | break; | |
2986 | ||
2987 | case 2: | |
4f8b691c | 2988 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2989 | break; |
2990 | ||
2991 | case 4: | |
4f8b691c | 2992 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2993 | break; |
2994 | ||
2995 | default: | |
2996 | memcpy(opt->val, (void *) val, len); | |
2997 | break; | |
2998 | } | |
2999 | ||
3000 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
3001 | } | |
3002 | ||
f89cef09 AE |
3003 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
3004 | { | |
3005 | struct l2cap_conf_efs efs; | |
3006 | ||
1ec918ce | 3007 | switch (chan->mode) { |
f89cef09 AE |
3008 | case L2CAP_MODE_ERTM: |
3009 | efs.id = chan->local_id; | |
3010 | efs.stype = chan->local_stype; | |
3011 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3012 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
dcf4adbf JP |
3013 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
3014 | efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
3015 | break; |
3016 | ||
3017 | case L2CAP_MODE_STREAMING: | |
3018 | efs.id = 1; | |
3019 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
3020 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3021 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
3022 | efs.acc_lat = 0; | |
3023 | efs.flush_to = 0; | |
3024 | break; | |
3025 | ||
3026 | default: | |
3027 | return; | |
3028 | } | |
3029 | ||
3030 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 3031 | (unsigned long) &efs); |
f89cef09 AE |
3032 | } |
3033 | ||
721c4181 | 3034 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3035 | { |
721c4181 | 3036 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3037 | ack_timer.work); |
3038 | u16 frames_to_ack; | |
c1b4f43b | 3039 | |
2fb9b3d4 GP |
3040 | BT_DBG("chan %p", chan); |
3041 | ||
6be36555 AE |
3042 | l2cap_chan_lock(chan); |
3043 | ||
0362520b MM |
3044 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3045 | chan->last_acked_seq); | |
6be36555 | 3046 | |
0362520b MM |
3047 | if (frames_to_ack) |
3048 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3049 | |
0362520b | 3050 | l2cap_chan_unlock(chan); |
09bfb2ee | 3051 | l2cap_chan_put(chan); |
c1b4f43b GP |
3052 | } |
3053 | ||
466f8004 | 3054 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3055 | { |
3c588192 MM |
3056 | int err; |
3057 | ||
105bdf9e MM |
3058 | chan->next_tx_seq = 0; |
3059 | chan->expected_tx_seq = 0; | |
42e5c802 | 3060 | chan->expected_ack_seq = 0; |
6a026610 | 3061 | chan->unacked_frames = 0; |
42e5c802 | 3062 | chan->buffer_seq = 0; |
6a026610 | 3063 | chan->frames_sent = 0; |
105bdf9e MM |
3064 | chan->last_acked_seq = 0; |
3065 | chan->sdu = NULL; | |
3066 | chan->sdu_last_frag = NULL; | |
3067 | chan->sdu_len = 0; | |
3068 | ||
d34c34fb MM |
3069 | skb_queue_head_init(&chan->tx_q); |
3070 | ||
6ed971ca MH |
3071 | chan->local_amp_id = AMP_ID_BREDR; |
3072 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3073 | chan->move_state = L2CAP_MOVE_STABLE; |
3074 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3075 | ||
105bdf9e MM |
3076 | if (chan->mode != L2CAP_MODE_ERTM) |
3077 | return 0; | |
3078 | ||
3079 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3080 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3081 | |
721c4181 GP |
3082 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3083 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3084 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3085 | |
f1c6775b | 3086 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3087 | |
3c588192 MM |
3088 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3089 | if (err < 0) | |
3090 | return err; | |
3091 | ||
9dc9affc MM |
3092 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3093 | if (err < 0) | |
3094 | l2cap_seq_list_free(&chan->srej_list); | |
3095 | ||
3096 | return err; | |
0565c1c2 GP |
3097 | } |
3098 | ||
f2fcfcd6 GP |
3099 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3100 | { | |
3101 | switch (mode) { | |
3102 | case L2CAP_MODE_STREAMING: | |
3103 | case L2CAP_MODE_ERTM: | |
3104 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3105 | return mode; | |
3106 | /* fall through */ | |
3107 | default: | |
3108 | return L2CAP_MODE_BASIC; | |
3109 | } | |
3110 | } | |
3111 | ||
848566b3 | 3112 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3113 | { |
0bd49fc7 JH |
3114 | return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && |
3115 | (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW)); | |
6327eb98 AE |
3116 | } |
3117 | ||
848566b3 | 3118 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3119 | { |
0bd49fc7 JH |
3120 | return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && |
3121 | (conn->feat_mask & L2CAP_FEAT_EXT_FLOW)); | |
f89cef09 AE |
3122 | } |
3123 | ||
36c86c85 MM |
3124 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3125 | struct l2cap_conf_rfc *rfc) | |
3126 | { | |
6ed971ca | 3127 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3128 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3129 | ||
3130 | /* Class 1 devices have must have ERTM timeouts | |
3131 | * exceeding the Link Supervision Timeout. The | |
3132 | * default Link Supervision Timeout for AMP | |
3133 | * controllers is 10 seconds. | |
3134 | * | |
3135 | * Class 1 devices use 0xffffffff for their | |
3136 | * best-effort flush timeout, so the clamping logic | |
3137 | * will result in a timeout that meets the above | |
3138 | * requirement. ERTM timeouts are 16-bit values, so | |
3139 | * the maximum timeout is 65.535 seconds. | |
3140 | */ | |
3141 | ||
3142 | /* Convert timeout to milliseconds and round */ | |
3143 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3144 | ||
3145 | /* This is the recommended formula for class 2 devices | |
3146 | * that start ERTM timers when packets are sent to the | |
3147 | * controller. | |
3148 | */ | |
3149 | ertm_to = 3 * ertm_to + 500; | |
3150 | ||
3151 | if (ertm_to > 0xffff) | |
3152 | ertm_to = 0xffff; | |
3153 | ||
3154 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3155 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3156 | } else { | |
dcf4adbf JP |
3157 | rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3158 | rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36c86c85 MM |
3159 | } |
3160 | } | |
3161 | ||
6327eb98 AE |
3162 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3163 | { | |
3164 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3165 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3166 | /* use extended control field */ |
3167 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3168 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3169 | } else { | |
6327eb98 | 3170 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3171 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3172 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3173 | } | |
c20f8e35 | 3174 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3175 | } |
3176 | ||
710f9b0a | 3177 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3178 | { |
1da177e4 | 3179 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3180 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3181 | void *ptr = req->data; |
c8f79162 | 3182 | u16 size; |
1da177e4 | 3183 | |
49208c9c | 3184 | BT_DBG("chan %p", chan); |
1da177e4 | 3185 | |
73ffa904 | 3186 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3187 | goto done; |
3188 | ||
0c1bc5c6 | 3189 | switch (chan->mode) { |
f2fcfcd6 GP |
3190 | case L2CAP_MODE_STREAMING: |
3191 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3192 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3193 | break; |
85eb53c6 | 3194 | |
848566b3 | 3195 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3196 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3197 | ||
2ba13ed6 | 3198 | /* fall through */ |
f2fcfcd6 | 3199 | default: |
8c1d787b | 3200 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3201 | break; |
3202 | } | |
3203 | ||
3204 | done: | |
0c1bc5c6 GP |
3205 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3206 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3207 | |
0c1bc5c6 | 3208 | switch (chan->mode) { |
65c7c491 | 3209 | case L2CAP_MODE_BASIC: |
6fea7ad1 MH |
3210 | if (disable_ertm) |
3211 | break; | |
3212 | ||
8c1d787b | 3213 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3214 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3215 | break; |
3216 | ||
62547752 GP |
3217 | rfc.mode = L2CAP_MODE_BASIC; |
3218 | rfc.txwin_size = 0; | |
3219 | rfc.max_transmit = 0; | |
3220 | rfc.retrans_timeout = 0; | |
3221 | rfc.monitor_timeout = 0; | |
3222 | rfc.max_pdu_size = 0; | |
3223 | ||
63406504 | 3224 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3225 | (unsigned long) &rfc); |
65c7c491 MH |
3226 | break; |
3227 | ||
3228 | case L2CAP_MODE_ERTM: | |
3229 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3230 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3231 | |
3232 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
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); |
f2fcfcd6 | 3238 | |
6327eb98 AE |
3239 | l2cap_txwin_setup(chan); |
3240 | ||
3241 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3242 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3243 | |
63406504 | 3244 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3245 | (unsigned long) &rfc); |
63406504 | 3246 | |
f89cef09 AE |
3247 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3248 | l2cap_add_opt_efs(&ptr, chan); | |
3249 | ||
6327eb98 AE |
3250 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3251 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3252 | chan->tx_win); |
60918918 AE |
3253 | |
3254 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3255 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3256 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3257 | chan->fcs = L2CAP_FCS_NONE; |
3258 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3259 | chan->fcs); | |
3260 | } | |
f2fcfcd6 GP |
3261 | break; |
3262 | ||
3263 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3264 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3265 | rfc.mode = L2CAP_MODE_STREAMING; |
3266 | rfc.txwin_size = 0; | |
3267 | rfc.max_transmit = 0; | |
3268 | rfc.retrans_timeout = 0; | |
3269 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3270 | |
3271 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3272 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3273 | L2CAP_FCS_SIZE); | |
c8f79162 | 3274 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3275 | |
63406504 | 3276 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3277 | (unsigned long) &rfc); |
63406504 | 3278 | |
f89cef09 AE |
3279 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3280 | l2cap_add_opt_efs(&ptr, chan); | |
3281 | ||
60918918 AE |
3282 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3283 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3284 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3285 | chan->fcs = L2CAP_FCS_NONE; |
3286 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3287 | chan->fcs); | |
3288 | } | |
65c7c491 MH |
3289 | break; |
3290 | } | |
1da177e4 | 3291 | |
fe4128e0 | 3292 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3293 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
3294 | |
3295 | return ptr - data; | |
3296 | } | |
3297 | ||
73ffa904 | 3298 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3299 | { |
5dee9e7c MH |
3300 | struct l2cap_conf_rsp *rsp = data; |
3301 | void *ptr = rsp->data; | |
73ffa904 GP |
3302 | void *req = chan->conf_req; |
3303 | int len = chan->conf_len; | |
5dee9e7c MH |
3304 | int type, hint, olen; |
3305 | unsigned long val; | |
6464f35f | 3306 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3307 | struct l2cap_conf_efs efs; |
3308 | u8 remote_efs = 0; | |
861d6882 | 3309 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3310 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3311 | u16 size; |
1da177e4 | 3312 | |
73ffa904 | 3313 | BT_DBG("chan %p", chan); |
820ae1b8 | 3314 | |
5dee9e7c MH |
3315 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3316 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3317 | |
589d2746 | 3318 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3319 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3320 | |
3321 | switch (type) { | |
3322 | case L2CAP_CONF_MTU: | |
861d6882 | 3323 | mtu = val; |
5dee9e7c MH |
3324 | break; |
3325 | ||
3326 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3327 | chan->flush_to = val; |
5dee9e7c MH |
3328 | break; |
3329 | ||
3330 | case L2CAP_CONF_QOS: | |
3331 | break; | |
3332 | ||
6464f35f MH |
3333 | case L2CAP_CONF_RFC: |
3334 | if (olen == sizeof(rfc)) | |
3335 | memcpy(&rfc, (void *) val, olen); | |
3336 | break; | |
3337 | ||
fcc203c3 GP |
3338 | case L2CAP_CONF_FCS: |
3339 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3340 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3341 | break; |
fcc203c3 | 3342 | |
42dceae2 AE |
3343 | case L2CAP_CONF_EFS: |
3344 | remote_efs = 1; | |
3345 | if (olen == sizeof(efs)) | |
3346 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3347 | break; |
3348 | ||
6327eb98 | 3349 | case L2CAP_CONF_EWS: |
0bd49fc7 | 3350 | if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP)) |
6327eb98 | 3351 | return -ECONNREFUSED; |
fcc203c3 | 3352 | |
6327eb98 AE |
3353 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3354 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3355 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3356 | chan->remote_tx_win = val; |
fcc203c3 GP |
3357 | break; |
3358 | ||
5dee9e7c MH |
3359 | default: |
3360 | if (hint) | |
3361 | break; | |
3362 | ||
3363 | result = L2CAP_CONF_UNKNOWN; | |
3364 | *((u8 *) ptr++) = type; | |
3365 | break; | |
3366 | } | |
3367 | } | |
3368 | ||
73ffa904 | 3369 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3370 | goto done; |
3371 | ||
0c1bc5c6 | 3372 | switch (chan->mode) { |
f2fcfcd6 GP |
3373 | case L2CAP_MODE_STREAMING: |
3374 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3375 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3376 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3377 | chan->conn->feat_mask); |
85eb53c6 GP |
3378 | break; |
3379 | } | |
3380 | ||
42dceae2 | 3381 | if (remote_efs) { |
848566b3 | 3382 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3383 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3384 | else | |
3385 | return -ECONNREFUSED; | |
3386 | } | |
3387 | ||
0c1bc5c6 | 3388 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3389 | return -ECONNREFUSED; |
742e519b | 3390 | |
f2fcfcd6 | 3391 | break; |
f2fcfcd6 GP |
3392 | } |
3393 | ||
3394 | done: | |
0c1bc5c6 | 3395 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3396 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3397 | rfc.mode = chan->mode; |
f2fcfcd6 | 3398 | |
73ffa904 | 3399 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3400 | return -ECONNREFUSED; |
3401 | ||
2d792818 GP |
3402 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3403 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3404 | } |
3405 | ||
5dee9e7c MH |
3406 | if (result == L2CAP_CONF_SUCCESS) { |
3407 | /* Configure output options and let the other side know | |
3408 | * which ones we don't like. */ | |
3409 | ||
f2fcfcd6 GP |
3410 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3411 | result = L2CAP_CONF_UNACCEPT; | |
3412 | else { | |
0c1bc5c6 | 3413 | chan->omtu = mtu; |
c1360a1c | 3414 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3415 | } |
0c1bc5c6 | 3416 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3417 | |
42dceae2 AE |
3418 | if (remote_efs) { |
3419 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3420 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3421 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3422 | |
3423 | result = L2CAP_CONF_UNACCEPT; | |
3424 | ||
3425 | if (chan->num_conf_req >= 1) | |
3426 | return -ECONNREFUSED; | |
3427 | ||
3428 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3429 | sizeof(efs), |
3430 | (unsigned long) &efs); | |
0e8b207e | 3431 | } else { |
3e6b3b95 | 3432 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3433 | result = L2CAP_CONF_PENDING; |
3434 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3435 | } |
3436 | } | |
3437 | ||
f2fcfcd6 GP |
3438 | switch (rfc.mode) { |
3439 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3440 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3441 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3442 | break; |
3443 | ||
3444 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3445 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3446 | chan->remote_tx_win = rfc.txwin_size; | |
3447 | else | |
3448 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3449 | |
2c03a7a4 | 3450 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3451 | |
c8f79162 | 3452 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3453 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3454 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3455 | rfc.max_pdu_size = cpu_to_le16(size); |
3456 | chan->remote_mps = size; | |
f2fcfcd6 | 3457 | |
36c86c85 | 3458 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3459 | |
c1360a1c | 3460 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3461 | |
3462 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3463 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3464 | |
42dceae2 AE |
3465 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3466 | chan->remote_id = efs.id; | |
3467 | chan->remote_stype = efs.stype; | |
3468 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3469 | chan->remote_flush_to = | |
2d792818 | 3470 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3471 | chan->remote_acc_lat = |
2d792818 | 3472 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3473 | chan->remote_sdu_itime = |
3474 | le32_to_cpu(efs.sdu_itime); | |
3475 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3476 | sizeof(efs), |
3477 | (unsigned long) &efs); | |
42dceae2 | 3478 | } |
f2fcfcd6 GP |
3479 | break; |
3480 | ||
3481 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3482 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3483 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3484 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3485 | rfc.max_pdu_size = cpu_to_le16(size); |
3486 | chan->remote_mps = size; | |
f2fcfcd6 | 3487 | |
c1360a1c | 3488 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3489 | |
2d792818 GP |
3490 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3491 | (unsigned long) &rfc); | |
68ae6639 | 3492 | |
f2fcfcd6 GP |
3493 | break; |
3494 | ||
3495 | default: | |
5dee9e7c | 3496 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3497 | |
6464f35f | 3498 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3499 | rfc.mode = chan->mode; |
f2fcfcd6 | 3500 | } |
6464f35f | 3501 | |
f2fcfcd6 | 3502 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3503 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3504 | } |
fe4128e0 | 3505 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3506 | rsp->result = cpu_to_le16(result); |
dcf4adbf | 3507 | rsp->flags = cpu_to_le16(0); |
5dee9e7c MH |
3508 | |
3509 | return ptr - data; | |
1da177e4 LT |
3510 | } |
3511 | ||
2d792818 GP |
3512 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3513 | void *data, u16 *result) | |
f2fcfcd6 | 3514 | { |
f2fcfcd6 GP |
3515 | struct l2cap_conf_req *req = data; |
3516 | void *ptr = req->data; | |
3517 | int type, olen; | |
3518 | unsigned long val; | |
36e999a8 | 3519 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3520 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3521 | |
fe4128e0 | 3522 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3523 | |
3524 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3525 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3526 | ||
3527 | switch (type) { | |
3528 | case L2CAP_CONF_MTU: | |
3529 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3530 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3531 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3532 | } else |
0c1bc5c6 GP |
3533 | chan->imtu = val; |
3534 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3535 | break; |
3536 | ||
3537 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3538 | chan->flush_to = val; |
f2fcfcd6 | 3539 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3540 | 2, chan->flush_to); |
f2fcfcd6 GP |
3541 | break; |
3542 | ||
3543 | case L2CAP_CONF_RFC: | |
3544 | if (olen == sizeof(rfc)) | |
3545 | memcpy(&rfc, (void *)val, olen); | |
3546 | ||
c1360a1c | 3547 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3548 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3549 | return -ECONNREFUSED; |
3550 | ||
47d1ec61 | 3551 | chan->fcs = 0; |
f2fcfcd6 GP |
3552 | |
3553 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3554 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3555 | break; |
6327eb98 AE |
3556 | |
3557 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3558 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3559 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3560 | chan->tx_win); |
6327eb98 | 3561 | break; |
66af7aaf AE |
3562 | |
3563 | case L2CAP_CONF_EFS: | |
3564 | if (olen == sizeof(efs)) | |
3565 | memcpy(&efs, (void *)val, olen); | |
3566 | ||
3567 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3568 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3569 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3570 | return -ECONNREFUSED; |
3571 | ||
2d792818 GP |
3572 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3573 | (unsigned long) &efs); | |
66af7aaf | 3574 | break; |
cbabee78 AE |
3575 | |
3576 | case L2CAP_CONF_FCS: | |
3577 | if (*result == L2CAP_CONF_PENDING) | |
3578 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3579 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3580 | &chan->conf_state); |
3581 | break; | |
f2fcfcd6 GP |
3582 | } |
3583 | } | |
3584 | ||
0c1bc5c6 | 3585 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3586 | return -ECONNREFUSED; |
3587 | ||
0c1bc5c6 | 3588 | chan->mode = rfc.mode; |
6c2ea7a8 | 3589 | |
0e8b207e | 3590 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3591 | switch (rfc.mode) { |
3592 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3593 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3594 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3595 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3596 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3597 | chan->ack_win = min_t(u16, chan->ack_win, | |
3598 | rfc.txwin_size); | |
66af7aaf AE |
3599 | |
3600 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3601 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3602 | chan->local_sdu_itime = | |
2d792818 | 3603 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3604 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3605 | chan->local_flush_to = | |
2d792818 | 3606 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3607 | } |
f2fcfcd6 | 3608 | break; |
66af7aaf | 3609 | |
f2fcfcd6 | 3610 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3611 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3612 | } |
3613 | } | |
3614 | ||
fe4128e0 | 3615 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3616 | req->flags = cpu_to_le16(0); |
f2fcfcd6 GP |
3617 | |
3618 | return ptr - data; | |
3619 | } | |
3620 | ||
2d792818 GP |
3621 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3622 | u16 result, u16 flags) | |
1da177e4 LT |
3623 | { |
3624 | struct l2cap_conf_rsp *rsp = data; | |
3625 | void *ptr = rsp->data; | |
1da177e4 | 3626 | |
fe4128e0 | 3627 | BT_DBG("chan %p", chan); |
1da177e4 | 3628 | |
fe4128e0 | 3629 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3630 | rsp->result = cpu_to_le16(result); |
aca3192c | 3631 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3632 | |
3633 | return ptr - data; | |
3634 | } | |
3635 | ||
27e2d4c8 JH |
3636 | void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) |
3637 | { | |
3638 | struct l2cap_le_conn_rsp rsp; | |
3639 | struct l2cap_conn *conn = chan->conn; | |
3640 | ||
3641 | BT_DBG("chan %p", chan); | |
3642 | ||
3643 | rsp.dcid = cpu_to_le16(chan->scid); | |
3644 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 3645 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 3646 | rsp.credits = cpu_to_le16(chan->rx_credits); |
dcf4adbf | 3647 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
27e2d4c8 JH |
3648 | |
3649 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
3650 | &rsp); | |
3651 | } | |
3652 | ||
8c1d787b | 3653 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3654 | { |
3655 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3656 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3657 | u8 buf[128]; |
439f34ac | 3658 | u8 rsp_code; |
710f9b0a | 3659 | |
fe4128e0 GP |
3660 | rsp.scid = cpu_to_le16(chan->dcid); |
3661 | rsp.dcid = cpu_to_le16(chan->scid); | |
dcf4adbf JP |
3662 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3663 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3664 | |
3665 | if (chan->hs_hcon) | |
3666 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3667 | else | |
3668 | rsp_code = L2CAP_CONN_RSP; | |
3669 | ||
3670 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3671 | ||
3672 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3673 | |
c1360a1c | 3674 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3675 | return; |
3676 | ||
710f9b0a | 3677 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3678 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3679 | chan->num_conf_req++; |
3680 | } | |
3681 | ||
47d1ec61 | 3682 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3683 | { |
7b1c0049 GP |
3684 | int type, olen; |
3685 | unsigned long val; | |
c20f8e35 MM |
3686 | /* Use sane default values in case a misbehaving remote device |
3687 | * did not send an RFC or extended window size option. | |
3688 | */ | |
3689 | u16 txwin_ext = chan->ack_win; | |
3690 | struct l2cap_conf_rfc rfc = { | |
3691 | .mode = chan->mode, | |
dcf4adbf JP |
3692 | .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), |
3693 | .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
c20f8e35 MM |
3694 | .max_pdu_size = cpu_to_le16(chan->imtu), |
3695 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3696 | }; | |
7b1c0049 | 3697 | |
47d1ec61 | 3698 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3699 | |
0c1bc5c6 | 3700 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3701 | return; |
3702 | ||
3703 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3704 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3705 | ||
c20f8e35 MM |
3706 | switch (type) { |
3707 | case L2CAP_CONF_RFC: | |
3708 | if (olen == sizeof(rfc)) | |
3709 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3710 | break; |
c20f8e35 MM |
3711 | case L2CAP_CONF_EWS: |
3712 | txwin_ext = val; | |
3713 | break; | |
3714 | } | |
7b1c0049 GP |
3715 | } |
3716 | ||
7b1c0049 GP |
3717 | switch (rfc.mode) { |
3718 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3719 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3720 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3721 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3722 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3723 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3724 | else | |
3725 | chan->ack_win = min_t(u16, chan->ack_win, | |
3726 | rfc.txwin_size); | |
7b1c0049 GP |
3727 | break; |
3728 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3729 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3730 | } |
3731 | } | |
3732 | ||
2d792818 | 3733 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3734 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3735 | u8 *data) | |
4e8402a3 | 3736 | { |
e2fd318e | 3737 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3738 | |
cb3b3152 JH |
3739 | if (cmd_len < sizeof(*rej)) |
3740 | return -EPROTO; | |
3741 | ||
e2fd318e | 3742 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3743 | return 0; |
3744 | ||
3745 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3746 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3747 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3748 | |
3749 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3750 | conn->info_ident = 0; |
984947dc | 3751 | |
4e8402a3 MH |
3752 | l2cap_conn_start(conn); |
3753 | } | |
3754 | ||
3755 | return 0; | |
3756 | } | |
3757 | ||
1700915f MM |
3758 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3759 | struct l2cap_cmd_hdr *cmd, | |
3760 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3761 | { |
1da177e4 LT |
3762 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3763 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3764 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3765 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3766 | |
3767 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3768 | __le16 psm = req->psm; |
1da177e4 | 3769 | |
097db76c | 3770 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3771 | |
3772 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3773 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
bf20fd4e | 3774 | &conn->hcon->dst, ACL_LINK); |
23691d75 | 3775 | if (!pchan) { |
1da177e4 LT |
3776 | result = L2CAP_CR_BAD_PSM; |
3777 | goto sendresp; | |
3778 | } | |
3779 | ||
3df91ea2 | 3780 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3781 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3782 | |
e7c29cb1 | 3783 | /* Check if the ACL is secure enough (if not SDP) */ |
dcf4adbf | 3784 | if (psm != cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3785 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3786 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3787 | result = L2CAP_CR_SEC_BLOCK; |
3788 | goto response; | |
3789 | } | |
3790 | ||
1da177e4 LT |
3791 | result = L2CAP_CR_NO_MEM; |
3792 | ||
2dfa1003 GP |
3793 | /* Check if we already have channel with that dcid */ |
3794 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3795 | goto response; | |
3796 | ||
80b98027 | 3797 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3798 | if (!chan) |
1da177e4 LT |
3799 | goto response; |
3800 | ||
330b6c15 SS |
3801 | /* For certain devices (ex: HID mouse), support for authentication, |
3802 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3803 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3804 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3805 | */ | |
3806 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3807 | ||
7eafc59e MH |
3808 | bacpy(&chan->src, &conn->hcon->src); |
3809 | bacpy(&chan->dst, &conn->hcon->dst); | |
a250e048 JH |
3810 | chan->src_type = bdaddr_src_type(conn->hcon); |
3811 | chan->dst_type = bdaddr_dst_type(conn->hcon); | |
fe4128e0 GP |
3812 | chan->psm = psm; |
3813 | chan->dcid = scid; | |
1700915f | 3814 | chan->local_amp_id = amp_id; |
1da177e4 | 3815 | |
6be36555 | 3816 | __l2cap_chan_add(conn, chan); |
48454079 | 3817 | |
fe4128e0 | 3818 | dcid = chan->scid; |
1da177e4 | 3819 | |
8d836d71 | 3820 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3821 | |
fc7f8a7e | 3822 | chan->ident = cmd->ident; |
1da177e4 | 3823 | |
984947dc | 3824 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
e7cafc45 | 3825 | if (l2cap_chan_check_security(chan, false)) { |
bdc25783 | 3826 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3827 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3828 | result = L2CAP_CR_PEND; |
3829 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3830 | chan->ops->defer(chan); |
f66dc81f | 3831 | } else { |
1700915f MM |
3832 | /* Force pending result for AMP controllers. |
3833 | * The connection will succeed after the | |
3834 | * physical link is up. | |
3835 | */ | |
6ed971ca | 3836 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3837 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3838 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3839 | } else { |
f93fa273 | 3840 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3841 | result = L2CAP_CR_PEND; |
1700915f | 3842 | } |
f66dc81f MH |
3843 | status = L2CAP_CS_NO_INFO; |
3844 | } | |
79d554a6 | 3845 | } else { |
f93fa273 | 3846 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3847 | result = L2CAP_CR_PEND; |
3848 | status = L2CAP_CS_AUTHEN_PEND; | |
3849 | } | |
3850 | } else { | |
f93fa273 | 3851 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3852 | result = L2CAP_CR_PEND; |
3853 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3854 | } |
3855 | ||
1da177e4 | 3856 | response: |
8ffb9290 | 3857 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3858 | mutex_unlock(&conn->chan_lock); |
a24cce14 | 3859 | l2cap_chan_put(pchan); |
1da177e4 LT |
3860 | |
3861 | sendresp: | |
aca3192c YH |
3862 | rsp.scid = cpu_to_le16(scid); |
3863 | rsp.dcid = cpu_to_le16(dcid); | |
3864 | rsp.result = cpu_to_le16(result); | |
3865 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3866 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3867 | |
3868 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3869 | struct l2cap_info_req info; | |
dcf4adbf | 3870 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3871 | |
3872 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3873 | conn->info_ident = l2cap_get_ident(conn); | |
3874 | ||
ba13ccd9 | 3875 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3876 | |
2d792818 GP |
3877 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3878 | sizeof(info), &info); | |
79d554a6 MH |
3879 | } |
3880 | ||
c1360a1c | 3881 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3882 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3883 | u8 buf[128]; |
c1360a1c | 3884 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3885 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3886 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3887 | chan->num_conf_req++; |
e9aeb2dd | 3888 | } |
1700915f MM |
3889 | |
3890 | return chan; | |
4c89b6aa | 3891 | } |
e9aeb2dd | 3892 | |
4c89b6aa | 3893 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3894 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3895 | { |
7b064eda JK |
3896 | struct hci_dev *hdev = conn->hcon->hdev; |
3897 | struct hci_conn *hcon = conn->hcon; | |
3898 | ||
cb3b3152 JH |
3899 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3900 | return -EPROTO; | |
3901 | ||
7b064eda | 3902 | hci_dev_lock(hdev); |
d7a5a11d | 3903 | if (hci_dev_test_flag(hdev, HCI_MGMT) && |
7b064eda | 3904 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) |
48ec92fa | 3905 | mgmt_device_connected(hdev, hcon, 0, NULL, 0); |
7b064eda JK |
3906 | hci_dev_unlock(hdev); |
3907 | ||
300229f9 | 3908 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3909 | return 0; |
3910 | } | |
3911 | ||
5909cf30 | 3912 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3913 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3914 | u8 *data) | |
1da177e4 LT |
3915 | { |
3916 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3917 | u16 scid, dcid, result, status; | |
48454079 | 3918 | struct l2cap_chan *chan; |
1da177e4 | 3919 | u8 req[128]; |
3df91ea2 | 3920 | int err; |
1da177e4 | 3921 | |
cb3b3152 JH |
3922 | if (cmd_len < sizeof(*rsp)) |
3923 | return -EPROTO; | |
3924 | ||
1da177e4 LT |
3925 | scid = __le16_to_cpu(rsp->scid); |
3926 | dcid = __le16_to_cpu(rsp->dcid); | |
3927 | result = __le16_to_cpu(rsp->result); | |
3928 | status = __le16_to_cpu(rsp->status); | |
3929 | ||
1b009c98 | 3930 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3931 | dcid, scid, result, status); |
1da177e4 | 3932 | |
3df91ea2 AE |
3933 | mutex_lock(&conn->chan_lock); |
3934 | ||
1da177e4 | 3935 | if (scid) { |
3df91ea2 AE |
3936 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3937 | if (!chan) { | |
21870b52 | 3938 | err = -EBADSLT; |
3df91ea2 AE |
3939 | goto unlock; |
3940 | } | |
1da177e4 | 3941 | } else { |
3df91ea2 AE |
3942 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3943 | if (!chan) { | |
21870b52 | 3944 | err = -EBADSLT; |
3df91ea2 AE |
3945 | goto unlock; |
3946 | } | |
1da177e4 LT |
3947 | } |
3948 | ||
3df91ea2 AE |
3949 | err = 0; |
3950 | ||
6be36555 | 3951 | l2cap_chan_lock(chan); |
48454079 | 3952 | |
1da177e4 LT |
3953 | switch (result) { |
3954 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3955 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3956 | chan->ident = 0; |
fe4128e0 | 3957 | chan->dcid = dcid; |
c1360a1c | 3958 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3959 | |
c1360a1c | 3960 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3961 | break; |
3962 | ||
1da177e4 | 3963 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3964 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3965 | chan->num_conf_req++; |
1da177e4 LT |
3966 | break; |
3967 | ||
3968 | case L2CAP_CR_PEND: | |
c1360a1c | 3969 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3970 | break; |
3971 | ||
3972 | default: | |
48454079 | 3973 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3974 | break; |
3975 | } | |
3976 | ||
6be36555 | 3977 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3978 | |
3979 | unlock: | |
3980 | mutex_unlock(&conn->chan_lock); | |
3981 | ||
3982 | return err; | |
1da177e4 LT |
3983 | } |
3984 | ||
47d1ec61 | 3985 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3986 | { |
3987 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3988 | * sides request it. | |
3989 | */ | |
0c1bc5c6 | 3990 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3991 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 3992 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 3993 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3994 | } |
3995 | ||
29d8a590 AE |
3996 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3997 | u8 ident, u16 flags) | |
3998 | { | |
3999 | struct l2cap_conn *conn = chan->conn; | |
4000 | ||
4001 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
4002 | flags); | |
4003 | ||
4004 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
4005 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
4006 | ||
4007 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
4008 | l2cap_build_conf_rsp(chan, data, | |
4009 | L2CAP_CONF_SUCCESS, flags), data); | |
4010 | } | |
4011 | ||
662d652d JH |
4012 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
4013 | u16 scid, u16 dcid) | |
4014 | { | |
4015 | struct l2cap_cmd_rej_cid rej; | |
4016 | ||
dcf4adbf | 4017 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); |
662d652d JH |
4018 | rej.scid = __cpu_to_le16(scid); |
4019 | rej.dcid = __cpu_to_le16(dcid); | |
4020 | ||
4021 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
4022 | } | |
4023 | ||
2d792818 GP |
4024 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
4025 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
4026 | u8 *data) | |
1da177e4 LT |
4027 | { |
4028 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
4029 | u16 dcid, flags; | |
4030 | u8 rsp[64]; | |
48454079 | 4031 | struct l2cap_chan *chan; |
3c588192 | 4032 | int len, err = 0; |
1da177e4 | 4033 | |
cb3b3152 JH |
4034 | if (cmd_len < sizeof(*req)) |
4035 | return -EPROTO; | |
4036 | ||
1da177e4 LT |
4037 | dcid = __le16_to_cpu(req->dcid); |
4038 | flags = __le16_to_cpu(req->flags); | |
4039 | ||
4040 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
4041 | ||
baa7e1fa | 4042 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
4043 | if (!chan) { |
4044 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
4045 | return 0; | |
4046 | } | |
1da177e4 | 4047 | |
033b1142 | 4048 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
4049 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4050 | chan->dcid); | |
354f60a9 | 4051 | goto unlock; |
df6bd743 | 4052 | } |
354f60a9 | 4053 | |
5dee9e7c | 4054 | /* Reject if config buffer is too small. */ |
88219a0f | 4055 | len = cmd_len - sizeof(*req); |
cb3b3152 | 4056 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4057 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4058 | l2cap_build_conf_rsp(chan, rsp, |
4059 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4060 | goto unlock; |
4061 | } | |
4062 | ||
4063 | /* Store config. */ | |
73ffa904 GP |
4064 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4065 | chan->conf_len += len; | |
1da177e4 | 4066 | |
59e54bd1 | 4067 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4068 | /* Incomplete config. Send empty response. */ |
4069 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4070 | l2cap_build_conf_rsp(chan, rsp, |
4071 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4072 | goto unlock; |
4073 | } | |
4074 | ||
4075 | /* Complete config. */ | |
73ffa904 | 4076 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4077 | if (len < 0) { |
5e4e3972 | 4078 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4079 | goto unlock; |
f2fcfcd6 | 4080 | } |
1da177e4 | 4081 | |
1500109b | 4082 | chan->ident = cmd->ident; |
5dee9e7c | 4083 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4084 | chan->num_conf_rsp++; |
5dee9e7c | 4085 | |
5dee9e7c | 4086 | /* Reset config buffer. */ |
73ffa904 | 4087 | chan->conf_len = 0; |
5dee9e7c | 4088 | |
c1360a1c | 4089 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4090 | goto unlock; |
4091 | ||
c1360a1c | 4092 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4093 | set_default_fcs(chan); |
fcc203c3 | 4094 | |
105bdf9e MM |
4095 | if (chan->mode == L2CAP_MODE_ERTM || |
4096 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4097 | err = l2cap_ertm_init(chan); |
4098 | ||
4099 | if (err < 0) | |
5e4e3972 | 4100 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4101 | else |
4102 | l2cap_chan_ready(chan); | |
0565c1c2 | 4103 | |
876d9484 MH |
4104 | goto unlock; |
4105 | } | |
4106 | ||
c1360a1c | 4107 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4108 | u8 buf[64]; |
1da177e4 | 4109 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4110 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4111 | chan->num_conf_req++; |
1da177e4 LT |
4112 | } |
4113 | ||
49c922bb | 4114 | /* Got Conf Rsp PENDING from remote side and assume we sent |
0e8b207e AE |
4115 | Conf Rsp PENDING in the code above */ |
4116 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4117 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4118 | |
4119 | /* check compatibility */ | |
4120 | ||
79de886d | 4121 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4122 | if (!chan->hs_hcon) |
79de886d AE |
4123 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4124 | else | |
4125 | chan->ident = cmd->ident; | |
0e8b207e AE |
4126 | } |
4127 | ||
1da177e4 | 4128 | unlock: |
6be36555 | 4129 | l2cap_chan_unlock(chan); |
3c588192 | 4130 | return err; |
1da177e4 LT |
4131 | } |
4132 | ||
2d792818 | 4133 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4134 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4135 | u8 *data) | |
1da177e4 LT |
4136 | { |
4137 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4138 | u16 scid, flags, result; | |
48454079 | 4139 | struct l2cap_chan *chan; |
cb3b3152 | 4140 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4141 | int err = 0; |
1da177e4 | 4142 | |
cb3b3152 JH |
4143 | if (cmd_len < sizeof(*rsp)) |
4144 | return -EPROTO; | |
4145 | ||
1da177e4 LT |
4146 | scid = __le16_to_cpu(rsp->scid); |
4147 | flags = __le16_to_cpu(rsp->flags); | |
4148 | result = __le16_to_cpu(rsp->result); | |
4149 | ||
61386cba AE |
4150 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4151 | result, len); | |
1da177e4 | 4152 | |
baa7e1fa | 4153 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4154 | if (!chan) |
1da177e4 LT |
4155 | return 0; |
4156 | ||
4157 | switch (result) { | |
4158 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4159 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4160 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4161 | break; |
4162 | ||
0e8b207e AE |
4163 | case L2CAP_CONF_PENDING: |
4164 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4165 | ||
4166 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4167 | char buf[64]; | |
4168 | ||
4169 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4170 | buf, &result); |
0e8b207e | 4171 | if (len < 0) { |
5e4e3972 | 4172 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4173 | goto done; |
4174 | } | |
4175 | ||
f351bc72 | 4176 | if (!chan->hs_hcon) { |
79de886d AE |
4177 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4178 | 0); | |
5ce66b59 AE |
4179 | } else { |
4180 | if (l2cap_check_efs(chan)) { | |
4181 | amp_create_logical_link(chan); | |
4182 | chan->ident = cmd->ident; | |
4183 | } | |
4184 | } | |
0e8b207e AE |
4185 | } |
4186 | goto done; | |
4187 | ||
1da177e4 | 4188 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4189 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4190 | char req[64]; |
4191 | ||
c2c77ec8 | 4192 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4193 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4194 | goto done; |
4195 | } | |
4196 | ||
f2fcfcd6 GP |
4197 | /* throw out any old stored conf requests */ |
4198 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4199 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4200 | req, &result); |
f2fcfcd6 | 4201 | if (len < 0) { |
5e4e3972 | 4202 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4203 | goto done; |
4204 | } | |
4205 | ||
4206 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4207 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4208 | chan->num_conf_req++; |
f2fcfcd6 GP |
4209 | if (result != L2CAP_CONF_SUCCESS) |
4210 | goto done; | |
4211 | break; | |
1da177e4 LT |
4212 | } |
4213 | ||
8e87d142 | 4214 | default: |
6be36555 | 4215 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4216 | |
ba13ccd9 | 4217 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4218 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4219 | goto done; |
4220 | } | |
4221 | ||
59e54bd1 | 4222 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4223 | goto done; |
4224 | ||
c1360a1c | 4225 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4226 | |
c1360a1c | 4227 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4228 | set_default_fcs(chan); |
fcc203c3 | 4229 | |
105bdf9e MM |
4230 | if (chan->mode == L2CAP_MODE_ERTM || |
4231 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4232 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4233 | |
3c588192 | 4234 | if (err < 0) |
5e4e3972 | 4235 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4236 | else |
4237 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4238 | } |
4239 | ||
4240 | done: | |
6be36555 | 4241 | l2cap_chan_unlock(chan); |
3c588192 | 4242 | return err; |
1da177e4 LT |
4243 | } |
4244 | ||
2d792818 | 4245 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4246 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4247 | u8 *data) | |
1da177e4 LT |
4248 | { |
4249 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4250 | struct l2cap_disconn_rsp rsp; | |
4251 | u16 dcid, scid; | |
48454079 | 4252 | struct l2cap_chan *chan; |
1da177e4 | 4253 | |
cb3b3152 JH |
4254 | if (cmd_len != sizeof(*req)) |
4255 | return -EPROTO; | |
4256 | ||
1da177e4 LT |
4257 | scid = __le16_to_cpu(req->scid); |
4258 | dcid = __le16_to_cpu(req->dcid); | |
4259 | ||
4260 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4261 | ||
3df91ea2 AE |
4262 | mutex_lock(&conn->chan_lock); |
4263 | ||
4264 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4265 | if (!chan) { | |
4266 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4267 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4268 | return 0; | |
3df91ea2 | 4269 | } |
1da177e4 | 4270 | |
6be36555 AE |
4271 | l2cap_chan_lock(chan); |
4272 | ||
fe4128e0 GP |
4273 | rsp.dcid = cpu_to_le16(chan->scid); |
4274 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4275 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4276 | ||
5ec1bbe5 | 4277 | chan->ops->set_shutdown(chan); |
1da177e4 | 4278 | |
61d6ef3e | 4279 | l2cap_chan_hold(chan); |
48454079 | 4280 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4281 | |
4282 | l2cap_chan_unlock(chan); | |
1da177e4 | 4283 | |
80b98027 | 4284 | chan->ops->close(chan); |
61d6ef3e | 4285 | l2cap_chan_put(chan); |
3df91ea2 AE |
4286 | |
4287 | mutex_unlock(&conn->chan_lock); | |
4288 | ||
1da177e4 LT |
4289 | return 0; |
4290 | } | |
4291 | ||
2d792818 | 4292 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4293 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4294 | u8 *data) | |
1da177e4 LT |
4295 | { |
4296 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4297 | u16 dcid, scid; | |
48454079 | 4298 | struct l2cap_chan *chan; |
1da177e4 | 4299 | |
cb3b3152 JH |
4300 | if (cmd_len != sizeof(*rsp)) |
4301 | return -EPROTO; | |
4302 | ||
1da177e4 LT |
4303 | scid = __le16_to_cpu(rsp->scid); |
4304 | dcid = __le16_to_cpu(rsp->dcid); | |
4305 | ||
4306 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4307 | ||
3df91ea2 AE |
4308 | mutex_lock(&conn->chan_lock); |
4309 | ||
4310 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4311 | if (!chan) { | |
4312 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4313 | return 0; |
3df91ea2 | 4314 | } |
1da177e4 | 4315 | |
6be36555 | 4316 | l2cap_chan_lock(chan); |
48454079 | 4317 | |
61d6ef3e | 4318 | l2cap_chan_hold(chan); |
48454079 | 4319 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4320 | |
4321 | l2cap_chan_unlock(chan); | |
1da177e4 | 4322 | |
80b98027 | 4323 | chan->ops->close(chan); |
61d6ef3e | 4324 | l2cap_chan_put(chan); |
3df91ea2 AE |
4325 | |
4326 | mutex_unlock(&conn->chan_lock); | |
4327 | ||
1da177e4 LT |
4328 | return 0; |
4329 | } | |
4330 | ||
2d792818 | 4331 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4332 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4333 | u8 *data) | |
1da177e4 LT |
4334 | { |
4335 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4336 | u16 type; |
4337 | ||
cb3b3152 JH |
4338 | if (cmd_len != sizeof(*req)) |
4339 | return -EPROTO; | |
4340 | ||
1da177e4 LT |
4341 | type = __le16_to_cpu(req->type); |
4342 | ||
4343 | BT_DBG("type 0x%4.4x", type); | |
4344 | ||
f0709e03 MH |
4345 | if (type == L2CAP_IT_FEAT_MASK) { |
4346 | u8 buf[8]; | |
44dd46de | 4347 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4348 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
dcf4adbf JP |
4349 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4350 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4351 | if (!disable_ertm) |
fcc203c3 | 4352 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4353 | | L2CAP_FEAT_FCS; |
0bd49fc7 | 4354 | if (conn->local_fixed_chan & L2CAP_FC_A2MP) |
6327eb98 | 4355 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4356 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4357 | |
1b7bf4ed | 4358 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4359 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4360 | buf); | |
e1027a7c MH |
4361 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4362 | u8 buf[12]; | |
4363 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4364 | |
dcf4adbf JP |
4365 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4366 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
0bd49fc7 JH |
4367 | rsp->data[0] = conn->local_fixed_chan; |
4368 | memset(rsp->data + 1, 0, 7); | |
2d792818 GP |
4369 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4370 | buf); | |
f0709e03 MH |
4371 | } else { |
4372 | struct l2cap_info_rsp rsp; | |
4373 | rsp.type = cpu_to_le16(type); | |
dcf4adbf | 4374 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4375 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4376 | &rsp); | |
f0709e03 | 4377 | } |
1da177e4 LT |
4378 | |
4379 | return 0; | |
4380 | } | |
4381 | ||
2d792818 | 4382 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4383 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4384 | u8 *data) | |
1da177e4 LT |
4385 | { |
4386 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4387 | u16 type, result; | |
4388 | ||
3f6fa3d4 | 4389 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4390 | return -EPROTO; |
4391 | ||
1da177e4 LT |
4392 | type = __le16_to_cpu(rsp->type); |
4393 | result = __le16_to_cpu(rsp->result); | |
4394 | ||
4395 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4396 | ||
e90165be AE |
4397 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4398 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4399 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4400 | return 0; |
4401 | ||
17cd3f37 | 4402 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4403 | |
adb08ede VT |
4404 | if (result != L2CAP_IR_SUCCESS) { |
4405 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4406 | conn->info_ident = 0; | |
4407 | ||
4408 | l2cap_conn_start(conn); | |
4409 | ||
4410 | return 0; | |
4411 | } | |
4412 | ||
978c93b9 AE |
4413 | switch (type) { |
4414 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4415 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4416 | |
47ec1dcd | 4417 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4418 | struct l2cap_info_req req; |
dcf4adbf | 4419 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4420 | |
4421 | conn->info_ident = l2cap_get_ident(conn); | |
4422 | ||
4423 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4424 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4425 | } else { |
4426 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4427 | conn->info_ident = 0; | |
4428 | ||
4429 | l2cap_conn_start(conn); | |
4430 | } | |
978c93b9 AE |
4431 | break; |
4432 | ||
4433 | case L2CAP_IT_FIXED_CHAN: | |
0bd49fc7 | 4434 | conn->remote_fixed_chan = rsp->data[0]; |
984947dc | 4435 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4436 | conn->info_ident = 0; |
984947dc MH |
4437 | |
4438 | l2cap_conn_start(conn); | |
978c93b9 | 4439 | break; |
984947dc | 4440 | } |
4e8402a3 | 4441 | |
1da177e4 LT |
4442 | return 0; |
4443 | } | |
4444 | ||
1700915f MM |
4445 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4446 | struct l2cap_cmd_hdr *cmd, | |
4447 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4448 | { |
4449 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4450 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4451 | struct l2cap_chan *chan; |
6e1df6a6 | 4452 | struct hci_dev *hdev; |
f94ff6ff MM |
4453 | u16 psm, scid; |
4454 | ||
4455 | if (cmd_len != sizeof(*req)) | |
4456 | return -EPROTO; | |
4457 | ||
0bd49fc7 | 4458 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
f94ff6ff MM |
4459 | return -EINVAL; |
4460 | ||
4461 | psm = le16_to_cpu(req->psm); | |
4462 | scid = le16_to_cpu(req->scid); | |
4463 | ||
ad0ac6ca | 4464 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4465 | |
6e1df6a6 | 4466 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4467 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4468 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4469 | req->amp_id); | |
4470 | return 0; | |
4471 | } | |
1700915f | 4472 | |
6e1df6a6 AE |
4473 | /* Validate AMP controller id */ |
4474 | hdev = hci_dev_get(req->amp_id); | |
4475 | if (!hdev) | |
4476 | goto error; | |
1700915f | 4477 | |
6e1df6a6 AE |
4478 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4479 | hci_dev_put(hdev); | |
4480 | goto error; | |
4481 | } | |
1700915f | 4482 | |
6e1df6a6 AE |
4483 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4484 | req->amp_id); | |
4485 | if (chan) { | |
4486 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4487 | struct hci_conn *hs_hcon; | |
1700915f | 4488 | |
98e0f7ea MH |
4489 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4490 | &conn->hcon->dst); | |
6e1df6a6 AE |
4491 | if (!hs_hcon) { |
4492 | hci_dev_put(hdev); | |
662d652d JH |
4493 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4494 | chan->dcid); | |
4495 | return 0; | |
1700915f MM |
4496 | } |
4497 | ||
6e1df6a6 AE |
4498 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4499 | ||
6e1df6a6 AE |
4500 | mgr->bredr_chan = chan; |
4501 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4502 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4503 | conn->mtu = hdev->block_mtu; |
1700915f | 4504 | } |
f94ff6ff | 4505 | |
6e1df6a6 | 4506 | hci_dev_put(hdev); |
f94ff6ff MM |
4507 | |
4508 | return 0; | |
6e1df6a6 AE |
4509 | |
4510 | error: | |
4511 | rsp.dcid = 0; | |
4512 | rsp.scid = cpu_to_le16(scid); | |
dcf4adbf JP |
4513 | rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); |
4514 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
6e1df6a6 AE |
4515 | |
4516 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4517 | sizeof(rsp), &rsp); | |
4518 | ||
dc280801 | 4519 | return 0; |
f94ff6ff MM |
4520 | } |
4521 | ||
8eb200bd MM |
4522 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4523 | { | |
4524 | struct l2cap_move_chan_req req; | |
4525 | u8 ident; | |
4526 | ||
4527 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4528 | ||
4529 | ident = l2cap_get_ident(chan->conn); | |
4530 | chan->ident = ident; | |
4531 | ||
4532 | req.icid = cpu_to_le16(chan->scid); | |
4533 | req.dest_amp_id = dest_amp_id; | |
4534 | ||
4535 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4536 | &req); | |
4537 | ||
4538 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4539 | } | |
4540 | ||
1500109b | 4541 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4542 | { |
4543 | struct l2cap_move_chan_rsp rsp; | |
4544 | ||
1500109b | 4545 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4546 | |
1500109b | 4547 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4548 | rsp.result = cpu_to_le16(result); |
4549 | ||
1500109b MM |
4550 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4551 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4552 | } |
4553 | ||
5b155ef9 | 4554 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4555 | { |
4556 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4557 | |
5b155ef9 | 4558 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4559 | |
5b155ef9 | 4560 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4561 | |
5b155ef9 | 4562 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4563 | cfm.result = cpu_to_le16(result); |
4564 | ||
5b155ef9 MM |
4565 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4566 | sizeof(cfm), &cfm); | |
4567 | ||
4568 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4569 | } | |
4570 | ||
4571 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4572 | { | |
4573 | struct l2cap_move_chan_cfm cfm; | |
4574 | ||
4575 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4576 | ||
4577 | cfm.icid = cpu_to_le16(icid); | |
dcf4adbf | 4578 | cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); |
5b155ef9 MM |
4579 | |
4580 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4581 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4582 | } |
4583 | ||
4584 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4585 | u16 icid) |
8d5a04a1 MM |
4586 | { |
4587 | struct l2cap_move_chan_cfm_rsp rsp; | |
4588 | ||
ad0ac6ca | 4589 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4590 | |
4591 | rsp.icid = cpu_to_le16(icid); | |
4592 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4593 | } | |
4594 | ||
5f3847a4 MM |
4595 | static void __release_logical_link(struct l2cap_chan *chan) |
4596 | { | |
4597 | chan->hs_hchan = NULL; | |
4598 | chan->hs_hcon = NULL; | |
4599 | ||
4600 | /* Placeholder - release the logical link */ | |
4601 | } | |
4602 | ||
1500109b MM |
4603 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4604 | { | |
4605 | /* Logical link setup failed */ | |
4606 | if (chan->state != BT_CONNECTED) { | |
4607 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4608 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4609 | return; |
4610 | } | |
4611 | ||
4612 | switch (chan->move_role) { | |
4613 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4614 | l2cap_move_done(chan); | |
4615 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4616 | break; | |
4617 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4618 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4619 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4620 | /* Remote has only sent pending or | |
4621 | * success responses, clean up | |
4622 | */ | |
4623 | l2cap_move_done(chan); | |
4624 | } | |
4625 | ||
4626 | /* Other amp move states imply that the move | |
4627 | * has already aborted | |
4628 | */ | |
4629 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4630 | break; | |
4631 | } | |
4632 | } | |
4633 | ||
4634 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4635 | struct hci_chan *hchan) | |
4636 | { | |
4637 | struct l2cap_conf_rsp rsp; | |
1500109b | 4638 | |
336178a3 | 4639 | chan->hs_hchan = hchan; |
1500109b MM |
4640 | chan->hs_hcon->l2cap_data = chan->conn; |
4641 | ||
35ba9561 | 4642 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4643 | |
4644 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4645 | int err; |
1500109b MM |
4646 | |
4647 | set_default_fcs(chan); | |
4648 | ||
4649 | err = l2cap_ertm_init(chan); | |
4650 | if (err < 0) | |
5e4e3972 | 4651 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4652 | else |
4653 | l2cap_chan_ready(chan); | |
4654 | } | |
4655 | } | |
4656 | ||
4657 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4658 | struct hci_chan *hchan) | |
4659 | { | |
4660 | chan->hs_hcon = hchan->conn; | |
4661 | chan->hs_hcon->l2cap_data = chan->conn; | |
4662 | ||
4663 | BT_DBG("move_state %d", chan->move_state); | |
4664 | ||
4665 | switch (chan->move_state) { | |
4666 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4667 | /* Move confirm will be sent after a success | |
4668 | * response is received | |
4669 | */ | |
4670 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4671 | break; | |
4672 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4673 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4674 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4675 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4676 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4677 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4678 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4679 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4680 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4681 | } | |
4682 | break; | |
4683 | default: | |
4684 | /* Move was not in expected state, free the channel */ | |
4685 | __release_logical_link(chan); | |
4686 | ||
4687 | chan->move_state = L2CAP_MOVE_STABLE; | |
4688 | } | |
4689 | } | |
4690 | ||
4691 | /* Call with chan locked */ | |
27695fb4 AE |
4692 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4693 | u8 status) | |
5b155ef9 | 4694 | { |
1500109b MM |
4695 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4696 | ||
4697 | if (status) { | |
4698 | l2cap_logical_fail(chan); | |
4699 | __release_logical_link(chan); | |
4700 | return; | |
4701 | } | |
4702 | ||
4703 | if (chan->state != BT_CONNECTED) { | |
4704 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4705 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4706 | l2cap_logical_finish_create(chan, hchan); |
4707 | } else { | |
4708 | l2cap_logical_finish_move(chan, hchan); | |
4709 | } | |
5b155ef9 MM |
4710 | } |
4711 | ||
3f7a56c4 MM |
4712 | void l2cap_move_start(struct l2cap_chan *chan) |
4713 | { | |
4714 | BT_DBG("chan %p", chan); | |
4715 | ||
6ed971ca | 4716 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4717 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4718 | return; | |
4719 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4720 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4721 | /* Placeholder - start physical link setup */ | |
4722 | } else { | |
4723 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4724 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4725 | chan->move_id = 0; | |
4726 | l2cap_move_setup(chan); | |
4727 | l2cap_send_move_chan_req(chan, 0); | |
4728 | } | |
4729 | } | |
4730 | ||
8eb200bd MM |
4731 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4732 | u8 local_amp_id, u8 remote_amp_id) | |
4733 | { | |
62748ca1 AE |
4734 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4735 | local_amp_id, remote_amp_id); | |
4736 | ||
12d6cc60 AE |
4737 | chan->fcs = L2CAP_FCS_NONE; |
4738 | ||
62748ca1 AE |
4739 | /* Outgoing channel on AMP */ |
4740 | if (chan->state == BT_CONNECT) { | |
4741 | if (result == L2CAP_CR_SUCCESS) { | |
4742 | chan->local_amp_id = local_amp_id; | |
4743 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4744 | } else { | |
4745 | /* Revert to BR/EDR connect */ | |
4746 | l2cap_send_conn_req(chan); | |
4747 | } | |
4748 | ||
4749 | return; | |
4750 | } | |
4751 | ||
4752 | /* Incoming channel on AMP */ | |
4753 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4754 | struct l2cap_conn_rsp rsp; |
4755 | char buf[128]; | |
4756 | rsp.scid = cpu_to_le16(chan->dcid); | |
4757 | rsp.dcid = cpu_to_le16(chan->scid); | |
4758 | ||
8eb200bd MM |
4759 | if (result == L2CAP_CR_SUCCESS) { |
4760 | /* Send successful response */ | |
dcf4adbf JP |
4761 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
4762 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4763 | } else { |
4764 | /* Send negative response */ | |
dcf4adbf JP |
4765 | rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); |
4766 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4767 | } |
4768 | ||
4769 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4770 | sizeof(rsp), &rsp); | |
4771 | ||
4772 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4773 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4774 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4775 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4776 | L2CAP_CONF_REQ, | |
4777 | l2cap_build_conf_req(chan, buf), buf); | |
4778 | chan->num_conf_req++; | |
4779 | } | |
8eb200bd MM |
4780 | } |
4781 | } | |
4782 | ||
4783 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4784 | u8 remote_amp_id) | |
4785 | { | |
4786 | l2cap_move_setup(chan); | |
4787 | chan->move_id = local_amp_id; | |
4788 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4789 | ||
4790 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4791 | } | |
4792 | ||
4793 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4794 | { | |
4795 | struct hci_chan *hchan = NULL; | |
4796 | ||
4797 | /* Placeholder - get hci_chan for logical link */ | |
4798 | ||
4799 | if (hchan) { | |
4800 | if (hchan->state == BT_CONNECTED) { | |
4801 | /* Logical link is ready to go */ | |
4802 | chan->hs_hcon = hchan->conn; | |
4803 | chan->hs_hcon->l2cap_data = chan->conn; | |
4804 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4805 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4806 | ||
4807 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4808 | } else { | |
4809 | /* Wait for logical link to be ready */ | |
4810 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4811 | } | |
4812 | } else { | |
4813 | /* Logical link not available */ | |
4814 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4815 | } | |
4816 | } | |
4817 | ||
4818 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4819 | { | |
4820 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4821 | u8 rsp_result; | |
4822 | if (result == -EINVAL) | |
4823 | rsp_result = L2CAP_MR_BAD_ID; | |
4824 | else | |
4825 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4826 | ||
4827 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4828 | } | |
4829 | ||
4830 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4831 | chan->move_state = L2CAP_MOVE_STABLE; | |
4832 | ||
4833 | /* Restart data transmission */ | |
4834 | l2cap_ertm_send(chan); | |
4835 | } | |
4836 | ||
a514b17f AE |
4837 | /* Invoke with locked chan */ |
4838 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4839 | { |
770bfefa | 4840 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4841 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4842 | |
8eb200bd MM |
4843 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4844 | chan, result, local_amp_id, remote_amp_id); | |
4845 | ||
8eb200bd MM |
4846 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4847 | l2cap_chan_unlock(chan); | |
4848 | return; | |
4849 | } | |
4850 | ||
4851 | if (chan->state != BT_CONNECTED) { | |
4852 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4853 | } else if (result != L2CAP_MR_SUCCESS) { | |
4854 | l2cap_do_move_cancel(chan, result); | |
4855 | } else { | |
4856 | switch (chan->move_role) { | |
4857 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4858 | l2cap_do_move_initiate(chan, local_amp_id, | |
4859 | remote_amp_id); | |
4860 | break; | |
4861 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4862 | l2cap_do_move_respond(chan, result); | |
4863 | break; | |
4864 | default: | |
4865 | l2cap_do_move_cancel(chan, result); | |
4866 | break; | |
4867 | } | |
4868 | } | |
8eb200bd MM |
4869 | } |
4870 | ||
8d5a04a1 | 4871 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4872 | struct l2cap_cmd_hdr *cmd, |
4873 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4874 | { |
4875 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4876 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4877 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4878 | u16 icid = 0; |
4879 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4880 | ||
4881 | if (cmd_len != sizeof(*req)) | |
4882 | return -EPROTO; | |
4883 | ||
4884 | icid = le16_to_cpu(req->icid); | |
4885 | ||
ad0ac6ca | 4886 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4887 | |
0bd49fc7 | 4888 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
8d5a04a1 MM |
4889 | return -EINVAL; |
4890 | ||
02b0fbb9 MM |
4891 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4892 | if (!chan) { | |
1500109b | 4893 | rsp.icid = cpu_to_le16(icid); |
dcf4adbf | 4894 | rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); |
1500109b MM |
4895 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, |
4896 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4897 | return 0; |
4898 | } | |
4899 | ||
1500109b MM |
4900 | chan->ident = cmd->ident; |
4901 | ||
02b0fbb9 MM |
4902 | if (chan->scid < L2CAP_CID_DYN_START || |
4903 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4904 | (chan->mode != L2CAP_MODE_ERTM && | |
4905 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4906 | result = L2CAP_MR_NOT_ALLOWED; | |
4907 | goto send_move_response; | |
4908 | } | |
4909 | ||
4910 | if (chan->local_amp_id == req->dest_amp_id) { | |
4911 | result = L2CAP_MR_SAME_ID; | |
4912 | goto send_move_response; | |
4913 | } | |
4914 | ||
6ed971ca | 4915 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4916 | struct hci_dev *hdev; |
4917 | hdev = hci_dev_get(req->dest_amp_id); | |
4918 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4919 | !test_bit(HCI_UP, &hdev->flags)) { | |
4920 | if (hdev) | |
4921 | hci_dev_put(hdev); | |
4922 | ||
4923 | result = L2CAP_MR_BAD_ID; | |
4924 | goto send_move_response; | |
4925 | } | |
4926 | hci_dev_put(hdev); | |
4927 | } | |
4928 | ||
4929 | /* Detect a move collision. Only send a collision response | |
4930 | * if this side has "lost", otherwise proceed with the move. | |
4931 | * The winner has the larger bd_addr. | |
4932 | */ | |
4933 | if ((__chan_is_moving(chan) || | |
4934 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4935 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4936 | result = L2CAP_MR_COLLISION; |
4937 | goto send_move_response; | |
4938 | } | |
4939 | ||
02b0fbb9 MM |
4940 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4941 | l2cap_move_setup(chan); | |
4942 | chan->move_id = req->dest_amp_id; | |
4943 | icid = chan->dcid; | |
4944 | ||
6ed971ca | 4945 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4946 | /* Moving to BR/EDR */ |
4947 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4948 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4949 | result = L2CAP_MR_PEND; | |
4950 | } else { | |
4951 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4952 | result = L2CAP_MR_SUCCESS; | |
4953 | } | |
4954 | } else { | |
4955 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4956 | /* Placeholder - uncomment when amp functions are available */ | |
4957 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4958 | result = L2CAP_MR_PEND; | |
4959 | } | |
4960 | ||
4961 | send_move_response: | |
1500109b | 4962 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4963 | |
02b0fbb9 MM |
4964 | l2cap_chan_unlock(chan); |
4965 | ||
8d5a04a1 MM |
4966 | return 0; |
4967 | } | |
4968 | ||
5b155ef9 MM |
4969 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4970 | { | |
4971 | struct l2cap_chan *chan; | |
4972 | struct hci_chan *hchan = NULL; | |
4973 | ||
4974 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4975 | if (!chan) { | |
4976 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4977 | return; | |
4978 | } | |
4979 | ||
4980 | __clear_chan_timer(chan); | |
4981 | if (result == L2CAP_MR_PEND) | |
4982 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4983 | ||
4984 | switch (chan->move_state) { | |
4985 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4986 | /* Move confirm will be sent when logical link | |
4987 | * is complete. | |
4988 | */ | |
4989 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4990 | break; | |
4991 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4992 | if (result == L2CAP_MR_PEND) { | |
4993 | break; | |
4994 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4995 | &chan->conn_state)) { | |
4996 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4997 | } else { | |
4998 | /* Logical link is up or moving to BR/EDR, | |
4999 | * proceed with move | |
5000 | */ | |
5001 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
5002 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5003 | } | |
5004 | break; | |
5005 | case L2CAP_MOVE_WAIT_RSP: | |
5006 | /* Moving to AMP */ | |
5007 | if (result == L2CAP_MR_SUCCESS) { | |
5008 | /* Remote is ready, send confirm immediately | |
5009 | * after logical link is ready | |
5010 | */ | |
5011 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
5012 | } else { | |
5013 | /* Both logical link and move success | |
5014 | * are required to confirm | |
5015 | */ | |
5016 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
5017 | } | |
5018 | ||
5019 | /* Placeholder - get hci_chan for logical link */ | |
5020 | if (!hchan) { | |
5021 | /* Logical link not available */ | |
5022 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5023 | break; | |
5024 | } | |
5025 | ||
5026 | /* If the logical link is not yet connected, do not | |
5027 | * send confirmation. | |
5028 | */ | |
5029 | if (hchan->state != BT_CONNECTED) | |
5030 | break; | |
5031 | ||
5032 | /* Logical link is already ready to go */ | |
5033 | ||
5034 | chan->hs_hcon = hchan->conn; | |
5035 | chan->hs_hcon->l2cap_data = chan->conn; | |
5036 | ||
5037 | if (result == L2CAP_MR_SUCCESS) { | |
5038 | /* Can confirm now */ | |
5039 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5040 | } else { | |
5041 | /* Now only need move success | |
5042 | * to confirm | |
5043 | */ | |
5044 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
5045 | } | |
5046 | ||
5047 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
5048 | break; | |
5049 | default: | |
5050 | /* Any other amp move state means the move failed. */ | |
5051 | chan->move_id = chan->local_amp_id; | |
5052 | l2cap_move_done(chan); | |
5053 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5054 | } | |
5055 | ||
5056 | l2cap_chan_unlock(chan); | |
5057 | } | |
5058 | ||
5059 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5060 | u16 result) | |
5061 | { | |
5062 | struct l2cap_chan *chan; | |
5063 | ||
5064 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5065 | if (!chan) { | |
5066 | /* Could not locate channel, icid is best guess */ | |
5067 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5068 | return; | |
5069 | } | |
5070 | ||
5071 | __clear_chan_timer(chan); | |
5072 | ||
5073 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5074 | if (result == L2CAP_MR_COLLISION) { | |
5075 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5076 | } else { | |
5077 | /* Cleanup - cancel move */ | |
5078 | chan->move_id = chan->local_amp_id; | |
5079 | l2cap_move_done(chan); | |
5080 | } | |
5081 | } | |
5082 | ||
5083 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5084 | ||
5085 | l2cap_chan_unlock(chan); | |
5086 | } | |
5087 | ||
5088 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5089 | struct l2cap_cmd_hdr *cmd, | |
5090 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5091 | { |
5092 | struct l2cap_move_chan_rsp *rsp = data; | |
5093 | u16 icid, result; | |
5094 | ||
5095 | if (cmd_len != sizeof(*rsp)) | |
5096 | return -EPROTO; | |
5097 | ||
5098 | icid = le16_to_cpu(rsp->icid); | |
5099 | result = le16_to_cpu(rsp->result); | |
5100 | ||
ad0ac6ca | 5101 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5102 | |
5b155ef9 MM |
5103 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5104 | l2cap_move_continue(conn, icid, result); | |
5105 | else | |
5106 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5107 | |
5108 | return 0; | |
5109 | } | |
5110 | ||
5f3847a4 MM |
5111 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5112 | struct l2cap_cmd_hdr *cmd, | |
5113 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5114 | { |
5115 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5116 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5117 | u16 icid, result; |
5118 | ||
5119 | if (cmd_len != sizeof(*cfm)) | |
5120 | return -EPROTO; | |
5121 | ||
5122 | icid = le16_to_cpu(cfm->icid); | |
5123 | result = le16_to_cpu(cfm->result); | |
5124 | ||
ad0ac6ca | 5125 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5126 | |
5f3847a4 MM |
5127 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5128 | if (!chan) { | |
5129 | /* Spec requires a response even if the icid was not found */ | |
5130 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5131 | return 0; | |
5132 | } | |
5133 | ||
5134 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5135 | if (result == L2CAP_MC_CONFIRMED) { | |
5136 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5137 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5138 | __release_logical_link(chan); |
5139 | } else { | |
5140 | chan->move_id = chan->local_amp_id; | |
5141 | } | |
5142 | ||
5143 | l2cap_move_done(chan); | |
5144 | } | |
5145 | ||
8d5a04a1 MM |
5146 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5147 | ||
5f3847a4 MM |
5148 | l2cap_chan_unlock(chan); |
5149 | ||
8d5a04a1 MM |
5150 | return 0; |
5151 | } | |
5152 | ||
5153 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5154 | struct l2cap_cmd_hdr *cmd, |
5155 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5156 | { |
5157 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5158 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5159 | u16 icid; |
5160 | ||
5161 | if (cmd_len != sizeof(*rsp)) | |
5162 | return -EPROTO; | |
5163 | ||
5164 | icid = le16_to_cpu(rsp->icid); | |
5165 | ||
ad0ac6ca | 5166 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5167 | |
3fd71a0a MM |
5168 | chan = l2cap_get_chan_by_scid(conn, icid); |
5169 | if (!chan) | |
5170 | return 0; | |
5171 | ||
5172 | __clear_chan_timer(chan); | |
5173 | ||
5174 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5175 | chan->local_amp_id = chan->move_id; | |
5176 | ||
6ed971ca | 5177 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5178 | __release_logical_link(chan); |
5179 | ||
5180 | l2cap_move_done(chan); | |
5181 | } | |
5182 | ||
5183 | l2cap_chan_unlock(chan); | |
5184 | ||
8d5a04a1 MM |
5185 | return 0; |
5186 | } | |
5187 | ||
de73115a | 5188 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, |
2d792818 | 5189 | struct l2cap_cmd_hdr *cmd, |
203e639e | 5190 | u16 cmd_len, u8 *data) |
de73115a CT |
5191 | { |
5192 | struct hci_conn *hcon = conn->hcon; | |
5193 | struct l2cap_conn_param_update_req *req; | |
5194 | struct l2cap_conn_param_update_rsp rsp; | |
203e639e | 5195 | u16 min, max, latency, to_multiplier; |
2ce603eb | 5196 | int err; |
de73115a | 5197 | |
40bef302 | 5198 | if (hcon->role != HCI_ROLE_MASTER) |
de73115a CT |
5199 | return -EINVAL; |
5200 | ||
de73115a CT |
5201 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5202 | return -EPROTO; | |
5203 | ||
5204 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5205 | min = __le16_to_cpu(req->min); |
5206 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5207 | latency = __le16_to_cpu(req->latency); |
5208 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5209 | ||
5210 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5211 | min, max, latency, to_multiplier); |
de73115a CT |
5212 | |
5213 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb | 5214 | |
d4905f24 | 5215 | err = hci_check_conn_params(min, max, latency, to_multiplier); |
2ce603eb | 5216 | if (err) |
dcf4adbf | 5217 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5218 | else |
dcf4adbf | 5219 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5220 | |
5221 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5222 | sizeof(rsp), &rsp); |
de73115a | 5223 | |
ffb5a827 | 5224 | if (!err) { |
f4869e2a JH |
5225 | u8 store_hint; |
5226 | ||
5227 | store_hint = hci_le_conn_update(hcon, min, max, latency, | |
5228 | to_multiplier); | |
ffb5a827 | 5229 | mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type, |
f4869e2a JH |
5230 | store_hint, min, max, latency, |
5231 | to_multiplier); | |
ffb5a827 | 5232 | |
ffb5a827 | 5233 | } |
2ce603eb | 5234 | |
de73115a CT |
5235 | return 0; |
5236 | } | |
5237 | ||
f1496dee JH |
5238 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5239 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5240 | u8 *data) | |
5241 | { | |
5242 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; | |
3e64b7bd | 5243 | struct hci_conn *hcon = conn->hcon; |
f1496dee JH |
5244 | u16 dcid, mtu, mps, credits, result; |
5245 | struct l2cap_chan *chan; | |
3e64b7bd | 5246 | int err, sec_level; |
f1496dee JH |
5247 | |
5248 | if (cmd_len < sizeof(*rsp)) | |
5249 | return -EPROTO; | |
5250 | ||
5251 | dcid = __le16_to_cpu(rsp->dcid); | |
5252 | mtu = __le16_to_cpu(rsp->mtu); | |
5253 | mps = __le16_to_cpu(rsp->mps); | |
5254 | credits = __le16_to_cpu(rsp->credits); | |
5255 | result = __le16_to_cpu(rsp->result); | |
5256 | ||
5257 | if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23)) | |
5258 | return -EPROTO; | |
5259 | ||
5260 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", | |
5261 | dcid, mtu, mps, credits, result); | |
5262 | ||
5263 | mutex_lock(&conn->chan_lock); | |
5264 | ||
5265 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5266 | if (!chan) { | |
5267 | err = -EBADSLT; | |
5268 | goto unlock; | |
5269 | } | |
5270 | ||
5271 | err = 0; | |
5272 | ||
5273 | l2cap_chan_lock(chan); | |
5274 | ||
5275 | switch (result) { | |
5276 | case L2CAP_CR_SUCCESS: | |
5277 | chan->ident = 0; | |
5278 | chan->dcid = dcid; | |
5279 | chan->omtu = mtu; | |
5280 | chan->remote_mps = mps; | |
0cd75f7e | 5281 | chan->tx_credits = credits; |
f1496dee JH |
5282 | l2cap_chan_ready(chan); |
5283 | break; | |
5284 | ||
3e64b7bd JH |
5285 | case L2CAP_CR_AUTHENTICATION: |
5286 | case L2CAP_CR_ENCRYPTION: | |
5287 | /* If we already have MITM protection we can't do | |
5288 | * anything. | |
5289 | */ | |
5290 | if (hcon->sec_level > BT_SECURITY_MEDIUM) { | |
5291 | l2cap_chan_del(chan, ECONNREFUSED); | |
5292 | break; | |
5293 | } | |
5294 | ||
5295 | sec_level = hcon->sec_level + 1; | |
5296 | if (chan->sec_level < sec_level) | |
5297 | chan->sec_level = sec_level; | |
5298 | ||
5299 | /* We'll need to send a new Connect Request */ | |
5300 | clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags); | |
5301 | ||
5302 | smp_conn_security(hcon, chan->sec_level); | |
5303 | break; | |
5304 | ||
f1496dee JH |
5305 | default: |
5306 | l2cap_chan_del(chan, ECONNREFUSED); | |
5307 | break; | |
5308 | } | |
5309 | ||
5310 | l2cap_chan_unlock(chan); | |
5311 | ||
5312 | unlock: | |
5313 | mutex_unlock(&conn->chan_lock); | |
5314 | ||
5315 | return err; | |
5316 | } | |
5317 | ||
3300d9a9 | 5318 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5319 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5320 | u8 *data) | |
3300d9a9 CT |
5321 | { |
5322 | int err = 0; | |
5323 | ||
5324 | switch (cmd->code) { | |
5325 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5326 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5327 | break; |
5328 | ||
5329 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5330 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5331 | break; |
5332 | ||
5333 | case L2CAP_CONN_RSP: | |
f5a2598d | 5334 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5335 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5336 | break; |
5337 | ||
5338 | case L2CAP_CONF_REQ: | |
5339 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5340 | break; | |
5341 | ||
5342 | case L2CAP_CONF_RSP: | |
9245e737 | 5343 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5344 | break; |
5345 | ||
5346 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5347 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5348 | break; |
5349 | ||
5350 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5351 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5352 | break; |
5353 | ||
5354 | case L2CAP_ECHO_REQ: | |
5355 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5356 | break; | |
5357 | ||
5358 | case L2CAP_ECHO_RSP: | |
5359 | break; | |
5360 | ||
5361 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5362 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5363 | break; |
5364 | ||
5365 | case L2CAP_INFO_RSP: | |
9245e737 | 5366 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5367 | break; |
5368 | ||
f94ff6ff MM |
5369 | case L2CAP_CREATE_CHAN_REQ: |
5370 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5371 | break; | |
5372 | ||
8d5a04a1 MM |
5373 | case L2CAP_MOVE_CHAN_REQ: |
5374 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5375 | break; | |
5376 | ||
5377 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5378 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5379 | break; |
5380 | ||
5381 | case L2CAP_MOVE_CHAN_CFM: | |
5382 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5383 | break; | |
5384 | ||
5385 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5386 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5387 | break; |
5388 | ||
3300d9a9 CT |
5389 | default: |
5390 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5391 | err = -EINVAL; | |
5392 | break; | |
5393 | } | |
5394 | ||
5395 | return err; | |
5396 | } | |
5397 | ||
27e2d4c8 JH |
5398 | static int l2cap_le_connect_req(struct l2cap_conn *conn, |
5399 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5400 | u8 *data) | |
5401 | { | |
5402 | struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; | |
5403 | struct l2cap_le_conn_rsp rsp; | |
5404 | struct l2cap_chan *chan, *pchan; | |
0cd75f7e | 5405 | u16 dcid, scid, credits, mtu, mps; |
27e2d4c8 JH |
5406 | __le16 psm; |
5407 | u8 result; | |
5408 | ||
5409 | if (cmd_len != sizeof(*req)) | |
5410 | return -EPROTO; | |
5411 | ||
5412 | scid = __le16_to_cpu(req->scid); | |
5413 | mtu = __le16_to_cpu(req->mtu); | |
5414 | mps = __le16_to_cpu(req->mps); | |
5415 | psm = req->psm; | |
5416 | dcid = 0; | |
0cd75f7e | 5417 | credits = 0; |
27e2d4c8 JH |
5418 | |
5419 | if (mtu < 23 || mps < 23) | |
5420 | return -EPROTO; | |
5421 | ||
5422 | BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), | |
5423 | scid, mtu, mps); | |
5424 | ||
5425 | /* Check if we have socket listening on psm */ | |
5426 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, | |
5427 | &conn->hcon->dst, LE_LINK); | |
5428 | if (!pchan) { | |
5429 | result = L2CAP_CR_BAD_PSM; | |
5430 | chan = NULL; | |
5431 | goto response; | |
5432 | } | |
5433 | ||
5434 | mutex_lock(&conn->chan_lock); | |
5435 | l2cap_chan_lock(pchan); | |
5436 | ||
35dc6f83 JH |
5437 | if (!smp_sufficient_security(conn->hcon, pchan->sec_level, |
5438 | SMP_ALLOW_STK)) { | |
27e2d4c8 JH |
5439 | result = L2CAP_CR_AUTHENTICATION; |
5440 | chan = NULL; | |
5441 | goto response_unlock; | |
5442 | } | |
5443 | ||
5444 | /* Check if we already have channel with that dcid */ | |
5445 | if (__l2cap_get_chan_by_dcid(conn, scid)) { | |
5446 | result = L2CAP_CR_NO_MEM; | |
5447 | chan = NULL; | |
5448 | goto response_unlock; | |
5449 | } | |
5450 | ||
5451 | chan = pchan->ops->new_connection(pchan); | |
5452 | if (!chan) { | |
5453 | result = L2CAP_CR_NO_MEM; | |
5454 | goto response_unlock; | |
5455 | } | |
5456 | ||
0ce43ce6 JH |
5457 | l2cap_le_flowctl_init(chan); |
5458 | ||
27e2d4c8 JH |
5459 | bacpy(&chan->src, &conn->hcon->src); |
5460 | bacpy(&chan->dst, &conn->hcon->dst); | |
a250e048 JH |
5461 | chan->src_type = bdaddr_src_type(conn->hcon); |
5462 | chan->dst_type = bdaddr_dst_type(conn->hcon); | |
27e2d4c8 JH |
5463 | chan->psm = psm; |
5464 | chan->dcid = scid; | |
5465 | chan->omtu = mtu; | |
5466 | chan->remote_mps = mps; | |
0cd75f7e | 5467 | chan->tx_credits = __le16_to_cpu(req->credits); |
27e2d4c8 JH |
5468 | |
5469 | __l2cap_chan_add(conn, chan); | |
5470 | dcid = chan->scid; | |
0cd75f7e | 5471 | credits = chan->rx_credits; |
27e2d4c8 JH |
5472 | |
5473 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
5474 | ||
5475 | chan->ident = cmd->ident; | |
5476 | ||
5477 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { | |
5478 | l2cap_state_change(chan, BT_CONNECT2); | |
434714dc JH |
5479 | /* The following result value is actually not defined |
5480 | * for LE CoC but we use it to let the function know | |
5481 | * that it should bail out after doing its cleanup | |
5482 | * instead of sending a response. | |
5483 | */ | |
27e2d4c8 JH |
5484 | result = L2CAP_CR_PEND; |
5485 | chan->ops->defer(chan); | |
5486 | } else { | |
5487 | l2cap_chan_ready(chan); | |
5488 | result = L2CAP_CR_SUCCESS; | |
5489 | } | |
5490 | ||
5491 | response_unlock: | |
5492 | l2cap_chan_unlock(pchan); | |
5493 | mutex_unlock(&conn->chan_lock); | |
a24cce14 | 5494 | l2cap_chan_put(pchan); |
27e2d4c8 JH |
5495 | |
5496 | if (result == L2CAP_CR_PEND) | |
5497 | return 0; | |
5498 | ||
5499 | response: | |
5500 | if (chan) { | |
5501 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 5502 | rsp.mps = cpu_to_le16(chan->mps); |
27e2d4c8 JH |
5503 | } else { |
5504 | rsp.mtu = 0; | |
5505 | rsp.mps = 0; | |
5506 | } | |
5507 | ||
5508 | rsp.dcid = cpu_to_le16(dcid); | |
0cd75f7e | 5509 | rsp.credits = cpu_to_le16(credits); |
27e2d4c8 JH |
5510 | rsp.result = cpu_to_le16(result); |
5511 | ||
5512 | l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); | |
5513 | ||
5514 | return 0; | |
5515 | } | |
5516 | ||
fad5fc89 JH |
5517 | static inline int l2cap_le_credits(struct l2cap_conn *conn, |
5518 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5519 | u8 *data) | |
5520 | { | |
5521 | struct l2cap_le_credits *pkt; | |
5522 | struct l2cap_chan *chan; | |
0f1bfe4e | 5523 | u16 cid, credits, max_credits; |
fad5fc89 JH |
5524 | |
5525 | if (cmd_len != sizeof(*pkt)) | |
5526 | return -EPROTO; | |
5527 | ||
5528 | pkt = (struct l2cap_le_credits *) data; | |
5529 | cid = __le16_to_cpu(pkt->cid); | |
5530 | credits = __le16_to_cpu(pkt->credits); | |
5531 | ||
5532 | BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); | |
5533 | ||
5534 | chan = l2cap_get_chan_by_dcid(conn, cid); | |
5535 | if (!chan) | |
5536 | return -EBADSLT; | |
5537 | ||
0f1bfe4e JH |
5538 | max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; |
5539 | if (credits > max_credits) { | |
5540 | BT_ERR("LE credits overflow"); | |
5541 | l2cap_send_disconn_req(chan, ECONNRESET); | |
ee93053d | 5542 | l2cap_chan_unlock(chan); |
0f1bfe4e JH |
5543 | |
5544 | /* Return 0 so that we don't trigger an unnecessary | |
5545 | * command reject packet. | |
5546 | */ | |
5547 | return 0; | |
5548 | } | |
5549 | ||
fad5fc89 JH |
5550 | chan->tx_credits += credits; |
5551 | ||
5552 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
5553 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
5554 | chan->tx_credits--; | |
5555 | } | |
5556 | ||
5557 | if (chan->tx_credits) | |
5558 | chan->ops->resume(chan); | |
5559 | ||
5560 | l2cap_chan_unlock(chan); | |
5561 | ||
5562 | return 0; | |
5563 | } | |
5564 | ||
71fb4197 JH |
5565 | static inline int l2cap_le_command_rej(struct l2cap_conn *conn, |
5566 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5567 | u8 *data) | |
5568 | { | |
5569 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; | |
5570 | struct l2cap_chan *chan; | |
5571 | ||
5572 | if (cmd_len < sizeof(*rej)) | |
5573 | return -EPROTO; | |
5574 | ||
5575 | mutex_lock(&conn->chan_lock); | |
5576 | ||
5577 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5578 | if (!chan) | |
5579 | goto done; | |
5580 | ||
5581 | l2cap_chan_lock(chan); | |
5582 | l2cap_chan_del(chan, ECONNREFUSED); | |
5583 | l2cap_chan_unlock(chan); | |
5584 | ||
5585 | done: | |
5586 | mutex_unlock(&conn->chan_lock); | |
5587 | return 0; | |
5588 | } | |
5589 | ||
3300d9a9 | 5590 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
203e639e JH |
5591 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5592 | u8 *data) | |
3300d9a9 | 5593 | { |
b5ecba64 JH |
5594 | int err = 0; |
5595 | ||
3300d9a9 CT |
5596 | switch (cmd->code) { |
5597 | case L2CAP_COMMAND_REJ: | |
71fb4197 | 5598 | l2cap_le_command_rej(conn, cmd, cmd_len, data); |
b5ecba64 | 5599 | break; |
3300d9a9 CT |
5600 | |
5601 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
b5ecba64 JH |
5602 | err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
5603 | break; | |
3300d9a9 CT |
5604 | |
5605 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
b5ecba64 | 5606 | break; |
3300d9a9 | 5607 | |
f1496dee JH |
5608 | case L2CAP_LE_CONN_RSP: |
5609 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5610 | break; |
f1496dee | 5611 | |
27e2d4c8 | 5612 | case L2CAP_LE_CONN_REQ: |
b5ecba64 JH |
5613 | err = l2cap_le_connect_req(conn, cmd, cmd_len, data); |
5614 | break; | |
27e2d4c8 | 5615 | |
fad5fc89 JH |
5616 | case L2CAP_LE_CREDITS: |
5617 | err = l2cap_le_credits(conn, cmd, cmd_len, data); | |
5618 | break; | |
5619 | ||
3defe01a | 5620 | case L2CAP_DISCONN_REQ: |
b5ecba64 JH |
5621 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
5622 | break; | |
3defe01a JH |
5623 | |
5624 | case L2CAP_DISCONN_RSP: | |
5625 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5626 | break; |
3defe01a | 5627 | |
3300d9a9 CT |
5628 | default: |
5629 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
b5ecba64 JH |
5630 | err = -EINVAL; |
5631 | break; | |
3300d9a9 | 5632 | } |
b5ecba64 JH |
5633 | |
5634 | return err; | |
3300d9a9 CT |
5635 | } |
5636 | ||
c5623556 JH |
5637 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5638 | struct sk_buff *skb) | |
5639 | { | |
69c4e4e8 | 5640 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5641 | struct l2cap_cmd_hdr *cmd; |
5642 | u16 len; | |
c5623556 JH |
5643 | int err; |
5644 | ||
69c4e4e8 | 5645 | if (hcon->type != LE_LINK) |
3b166295 | 5646 | goto drop; |
69c4e4e8 | 5647 | |
4f3e219d MH |
5648 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5649 | goto drop; | |
c5623556 | 5650 | |
4f3e219d MH |
5651 | cmd = (void *) skb->data; |
5652 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5653 | |
4f3e219d | 5654 | len = le16_to_cpu(cmd->len); |
c5623556 | 5655 | |
4f3e219d | 5656 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5657 | |
4f3e219d MH |
5658 | if (len != skb->len || !cmd->ident) { |
5659 | BT_DBG("corrupted command"); | |
5660 | goto drop; | |
5661 | } | |
c5623556 | 5662 | |
203e639e | 5663 | err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); |
4f3e219d MH |
5664 | if (err) { |
5665 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5666 | |
4f3e219d | 5667 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5668 | |
dcf4adbf | 5669 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5670 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5671 | sizeof(rej), &rej); | |
c5623556 JH |
5672 | } |
5673 | ||
3b166295 | 5674 | drop: |
c5623556 JH |
5675 | kfree_skb(skb); |
5676 | } | |
5677 | ||
3300d9a9 | 5678 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5679 | struct sk_buff *skb) |
1da177e4 | 5680 | { |
69c4e4e8 | 5681 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5682 | u8 *data = skb->data; |
5683 | int len = skb->len; | |
5684 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5685 | int err; |
1da177e4 LT |
5686 | |
5687 | l2cap_raw_recv(conn, skb); | |
5688 | ||
69c4e4e8 | 5689 | if (hcon->type != ACL_LINK) |
3b166295 | 5690 | goto drop; |
69c4e4e8 | 5691 | |
1da177e4 | 5692 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5693 | u16 cmd_len; |
1da177e4 LT |
5694 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5695 | data += L2CAP_CMD_HDR_SIZE; | |
5696 | len -= L2CAP_CMD_HDR_SIZE; | |
5697 | ||
88219a0f | 5698 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5699 | |
2d792818 GP |
5700 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5701 | cmd.ident); | |
1da177e4 | 5702 | |
88219a0f | 5703 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5704 | BT_DBG("corrupted command"); |
5705 | break; | |
5706 | } | |
5707 | ||
c5623556 | 5708 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5709 | if (err) { |
e2fd318e | 5710 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5711 | |
5712 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5713 | |
dcf4adbf | 5714 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5715 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5716 | sizeof(rej), &rej); | |
1da177e4 LT |
5717 | } |
5718 | ||
88219a0f AV |
5719 | data += cmd_len; |
5720 | len -= cmd_len; | |
1da177e4 LT |
5721 | } |
5722 | ||
3b166295 | 5723 | drop: |
1da177e4 LT |
5724 | kfree_skb(skb); |
5725 | } | |
5726 | ||
47d1ec61 | 5727 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5728 | { |
5729 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5730 | int hdr_size; |
5731 | ||
5732 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5733 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5734 | else | |
5735 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5736 | |
47d1ec61 | 5737 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5738 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5739 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5740 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5741 | ||
5742 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5743 | return -EBADMSG; |
fcc203c3 GP |
5744 | } |
5745 | return 0; | |
5746 | } | |
5747 | ||
6ea00485 | 5748 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5749 | { |
e31f7633 | 5750 | struct l2cap_ctrl control; |
d5392c8f | 5751 | |
e31f7633 | 5752 | BT_DBG("chan %p", chan); |
d5392c8f | 5753 | |
e31f7633 MM |
5754 | memset(&control, 0, sizeof(control)); |
5755 | control.sframe = 1; | |
5756 | control.final = 1; | |
5757 | control.reqseq = chan->buffer_seq; | |
5758 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5759 | |
e2ab4353 | 5760 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5761 | control.super = L2CAP_SUPER_RNR; |
5762 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5763 | } |
5764 | ||
e31f7633 MM |
5765 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5766 | chan->unacked_frames > 0) | |
5767 | __set_retrans_timer(chan); | |
d5392c8f | 5768 | |
e31f7633 | 5769 | /* Send pending iframes */ |
525cd185 | 5770 | l2cap_ertm_send(chan); |
d5392c8f | 5771 | |
e2ab4353 | 5772 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5773 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5774 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5775 | * send it now. | |
5776 | */ | |
5777 | control.super = L2CAP_SUPER_RR; | |
5778 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5779 | } |
5780 | } | |
5781 | ||
2d792818 GP |
5782 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5783 | struct sk_buff **last_frag) | |
18778a63 | 5784 | { |
84084a31 MM |
5785 | /* skb->len reflects data in skb as well as all fragments |
5786 | * skb->data_len reflects only data in fragments | |
5787 | */ | |
5788 | if (!skb_has_frag_list(skb)) | |
5789 | skb_shinfo(skb)->frag_list = new_frag; | |
5790 | ||
5791 | new_frag->next = NULL; | |
5792 | ||
5793 | (*last_frag)->next = new_frag; | |
5794 | *last_frag = new_frag; | |
5795 | ||
5796 | skb->len += new_frag->len; | |
5797 | skb->data_len += new_frag->len; | |
5798 | skb->truesize += new_frag->truesize; | |
5799 | } | |
5800 | ||
4b51dae9 MM |
5801 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5802 | struct l2cap_ctrl *control) | |
84084a31 MM |
5803 | { |
5804 | int err = -EINVAL; | |
18778a63 | 5805 | |
4b51dae9 | 5806 | switch (control->sar) { |
7e0ef6ee | 5807 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5808 | if (chan->sdu) |
5809 | break; | |
18778a63 | 5810 | |
80b98027 | 5811 | err = chan->ops->recv(chan, skb); |
84084a31 | 5812 | break; |
18778a63 | 5813 | |
7e0ef6ee | 5814 | case L2CAP_SAR_START: |
84084a31 MM |
5815 | if (chan->sdu) |
5816 | break; | |
18778a63 | 5817 | |
6f61fd47 | 5818 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5819 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5820 | |
84084a31 MM |
5821 | if (chan->sdu_len > chan->imtu) { |
5822 | err = -EMSGSIZE; | |
5823 | break; | |
5824 | } | |
1890d36b | 5825 | |
84084a31 MM |
5826 | if (skb->len >= chan->sdu_len) |
5827 | break; | |
18778a63 | 5828 | |
84084a31 MM |
5829 | chan->sdu = skb; |
5830 | chan->sdu_last_frag = skb; | |
18778a63 | 5831 | |
84084a31 MM |
5832 | skb = NULL; |
5833 | err = 0; | |
18778a63 GP |
5834 | break; |
5835 | ||
7e0ef6ee | 5836 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5837 | if (!chan->sdu) |
84084a31 | 5838 | break; |
18778a63 | 5839 | |
84084a31 MM |
5840 | append_skb_frag(chan->sdu, skb, |
5841 | &chan->sdu_last_frag); | |
5842 | skb = NULL; | |
18778a63 | 5843 | |
84084a31 MM |
5844 | if (chan->sdu->len >= chan->sdu_len) |
5845 | break; | |
4178ba46 | 5846 | |
84084a31 | 5847 | err = 0; |
18778a63 GP |
5848 | break; |
5849 | ||
7e0ef6ee | 5850 | case L2CAP_SAR_END: |
6f61fd47 | 5851 | if (!chan->sdu) |
84084a31 | 5852 | break; |
18778a63 | 5853 | |
84084a31 MM |
5854 | append_skb_frag(chan->sdu, skb, |
5855 | &chan->sdu_last_frag); | |
5856 | skb = NULL; | |
4178ba46 | 5857 | |
84084a31 MM |
5858 | if (chan->sdu->len != chan->sdu_len) |
5859 | break; | |
18778a63 | 5860 | |
80b98027 | 5861 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5862 | |
84084a31 MM |
5863 | if (!err) { |
5864 | /* Reassembly complete */ | |
5865 | chan->sdu = NULL; | |
5866 | chan->sdu_last_frag = NULL; | |
5867 | chan->sdu_len = 0; | |
1890d36b | 5868 | } |
18778a63 GP |
5869 | break; |
5870 | } | |
5871 | ||
84084a31 MM |
5872 | if (err) { |
5873 | kfree_skb(skb); | |
5874 | kfree_skb(chan->sdu); | |
5875 | chan->sdu = NULL; | |
5876 | chan->sdu_last_frag = NULL; | |
5877 | chan->sdu_len = 0; | |
5878 | } | |
18778a63 | 5879 | |
84084a31 | 5880 | return err; |
18778a63 GP |
5881 | } |
5882 | ||
32b32735 MM |
5883 | static int l2cap_resegment(struct l2cap_chan *chan) |
5884 | { | |
5885 | /* Placeholder */ | |
5886 | return 0; | |
5887 | } | |
5888 | ||
61aa4f5b | 5889 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5890 | { |
61aa4f5b | 5891 | u8 event; |
712132eb | 5892 | |
61aa4f5b MM |
5893 | if (chan->mode != L2CAP_MODE_ERTM) |
5894 | return; | |
712132eb | 5895 | |
61aa4f5b | 5896 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5897 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5898 | } |
5899 | ||
d2a7ac5d MM |
5900 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5901 | { | |
63838725 MM |
5902 | int err = 0; |
5903 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5904 | * until a gap is encountered. | |
5905 | */ | |
5906 | ||
5907 | BT_DBG("chan %p", chan); | |
5908 | ||
5909 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5910 | struct sk_buff *skb; | |
5911 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5912 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5913 | ||
5914 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5915 | ||
5916 | if (!skb) | |
5917 | break; | |
5918 | ||
5919 | skb_unlink(skb, &chan->srej_q); | |
5920 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
a4368ff3 | 5921 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap); |
63838725 MM |
5922 | if (err) |
5923 | break; | |
5924 | } | |
5925 | ||
5926 | if (skb_queue_empty(&chan->srej_q)) { | |
5927 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5928 | l2cap_send_ack(chan); | |
5929 | } | |
5930 | ||
5931 | return err; | |
d2a7ac5d MM |
5932 | } |
5933 | ||
5934 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5935 | struct l2cap_ctrl *control) | |
5936 | { | |
f80842a8 MM |
5937 | struct sk_buff *skb; |
5938 | ||
5939 | BT_DBG("chan %p, control %p", chan, control); | |
5940 | ||
5941 | if (control->reqseq == chan->next_tx_seq) { | |
5942 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5943 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5944 | return; |
5945 | } | |
5946 | ||
5947 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5948 | ||
5949 | if (skb == NULL) { | |
5950 | BT_DBG("Seq %d not available for retransmission", | |
5951 | control->reqseq); | |
5952 | return; | |
5953 | } | |
5954 | ||
a4368ff3 | 5955 | if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) { |
f80842a8 | 5956 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
5e4e3972 | 5957 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5958 | return; |
5959 | } | |
5960 | ||
5961 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5962 | ||
5963 | if (control->poll) { | |
5964 | l2cap_pass_to_tx(chan, control); | |
5965 | ||
5966 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5967 | l2cap_retransmit(chan, control); | |
5968 | l2cap_ertm_send(chan); | |
5969 | ||
5970 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5971 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5972 | chan->srej_save_reqseq = control->reqseq; | |
5973 | } | |
5974 | } else { | |
5975 | l2cap_pass_to_tx_fbit(chan, control); | |
5976 | ||
5977 | if (control->final) { | |
5978 | if (chan->srej_save_reqseq != control->reqseq || | |
5979 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5980 | &chan->conn_state)) | |
5981 | l2cap_retransmit(chan, control); | |
5982 | } else { | |
5983 | l2cap_retransmit(chan, control); | |
5984 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5985 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5986 | chan->srej_save_reqseq = control->reqseq; | |
5987 | } | |
5988 | } | |
5989 | } | |
d2a7ac5d MM |
5990 | } |
5991 | ||
5992 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
5993 | struct l2cap_ctrl *control) | |
5994 | { | |
fcd289df MM |
5995 | struct sk_buff *skb; |
5996 | ||
5997 | BT_DBG("chan %p, control %p", chan, control); | |
5998 | ||
5999 | if (control->reqseq == chan->next_tx_seq) { | |
6000 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 6001 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
6002 | return; |
6003 | } | |
6004 | ||
6005 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
6006 | ||
6007 | if (chan->max_tx && skb && | |
a4368ff3 | 6008 | bt_cb(skb)->l2cap.retries >= chan->max_tx) { |
fcd289df | 6009 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
5e4e3972 | 6010 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
6011 | return; |
6012 | } | |
6013 | ||
6014 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6015 | ||
6016 | l2cap_pass_to_tx(chan, control); | |
6017 | ||
6018 | if (control->final) { | |
6019 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
6020 | l2cap_retransmit_all(chan, control); | |
6021 | } else { | |
6022 | l2cap_retransmit_all(chan, control); | |
6023 | l2cap_ertm_send(chan); | |
6024 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
6025 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
6026 | } | |
d2a7ac5d MM |
6027 | } |
6028 | ||
4b51dae9 MM |
6029 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
6030 | { | |
6031 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
6032 | ||
6033 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
6034 | chan->expected_tx_seq); | |
6035 | ||
6036 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
6037 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 6038 | chan->tx_win) { |
4b51dae9 MM |
6039 | /* See notes below regarding "double poll" and |
6040 | * invalid packets. | |
6041 | */ | |
6042 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6043 | BT_DBG("Invalid/Ignore - after SREJ"); | |
6044 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6045 | } else { | |
6046 | BT_DBG("Invalid - in window after SREJ sent"); | |
6047 | return L2CAP_TXSEQ_INVALID; | |
6048 | } | |
6049 | } | |
6050 | ||
6051 | if (chan->srej_list.head == txseq) { | |
6052 | BT_DBG("Expected SREJ"); | |
6053 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
6054 | } | |
6055 | ||
6056 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
6057 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
6058 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
6059 | } | |
6060 | ||
6061 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
6062 | BT_DBG("Unexpected SREJ - not requested"); | |
6063 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
6064 | } | |
6065 | } | |
6066 | ||
6067 | if (chan->expected_tx_seq == txseq) { | |
6068 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
6069 | chan->tx_win) { | |
6070 | BT_DBG("Invalid - txseq outside tx window"); | |
6071 | return L2CAP_TXSEQ_INVALID; | |
6072 | } else { | |
6073 | BT_DBG("Expected"); | |
6074 | return L2CAP_TXSEQ_EXPECTED; | |
6075 | } | |
6076 | } | |
6077 | ||
6078 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 6079 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
6080 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
6081 | return L2CAP_TXSEQ_DUPLICATE; | |
6082 | } | |
6083 | ||
6084 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
6085 | /* A source of invalid packets is a "double poll" condition, | |
6086 | * where delays cause us to send multiple poll packets. If | |
6087 | * the remote stack receives and processes both polls, | |
6088 | * sequence numbers can wrap around in such a way that a | |
6089 | * resent frame has a sequence number that looks like new data | |
6090 | * with a sequence gap. This would trigger an erroneous SREJ | |
6091 | * request. | |
6092 | * | |
6093 | * Fortunately, this is impossible with a tx window that's | |
6094 | * less than half of the maximum sequence number, which allows | |
6095 | * invalid frames to be safely ignored. | |
6096 | * | |
6097 | * With tx window sizes greater than half of the tx window | |
6098 | * maximum, the frame is invalid and cannot be ignored. This | |
6099 | * causes a disconnect. | |
6100 | */ | |
6101 | ||
6102 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6103 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
6104 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6105 | } else { | |
6106 | BT_DBG("Invalid - txseq outside tx window"); | |
6107 | return L2CAP_TXSEQ_INVALID; | |
6108 | } | |
6109 | } else { | |
6110 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
6111 | return L2CAP_TXSEQ_UNEXPECTED; | |
6112 | } | |
6113 | } | |
6114 | ||
d2a7ac5d MM |
6115 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
6116 | struct l2cap_ctrl *control, | |
6117 | struct sk_buff *skb, u8 event) | |
6118 | { | |
6119 | int err = 0; | |
941247f9 | 6120 | bool skb_in_use = false; |
d2a7ac5d MM |
6121 | |
6122 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6123 | event); | |
6124 | ||
6125 | switch (event) { | |
6126 | case L2CAP_EV_RECV_IFRAME: | |
6127 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
6128 | case L2CAP_TXSEQ_EXPECTED: | |
6129 | l2cap_pass_to_tx(chan, control); | |
6130 | ||
6131 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6132 | BT_DBG("Busy, discarding expected seq %d", | |
6133 | control->txseq); | |
6134 | break; | |
6135 | } | |
6136 | ||
6137 | chan->expected_tx_seq = __next_seq(chan, | |
6138 | control->txseq); | |
6139 | ||
6140 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 6141 | skb_in_use = true; |
d2a7ac5d MM |
6142 | |
6143 | err = l2cap_reassemble_sdu(chan, skb, control); | |
6144 | if (err) | |
6145 | break; | |
6146 | ||
6147 | if (control->final) { | |
6148 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6149 | &chan->conn_state)) { | |
6150 | control->final = 0; | |
6151 | l2cap_retransmit_all(chan, control); | |
6152 | l2cap_ertm_send(chan); | |
6153 | } | |
6154 | } | |
6155 | ||
6156 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
6157 | l2cap_send_ack(chan); | |
6158 | break; | |
6159 | case L2CAP_TXSEQ_UNEXPECTED: | |
6160 | l2cap_pass_to_tx(chan, control); | |
6161 | ||
6162 | /* Can't issue SREJ frames in the local busy state. | |
6163 | * Drop this frame, it will be seen as missing | |
6164 | * when local busy is exited. | |
6165 | */ | |
6166 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6167 | BT_DBG("Busy, discarding unexpected seq %d", | |
6168 | control->txseq); | |
6169 | break; | |
6170 | } | |
6171 | ||
6172 | /* There was a gap in the sequence, so an SREJ | |
6173 | * must be sent for each missing frame. The | |
6174 | * current frame is stored for later use. | |
6175 | */ | |
6176 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6177 | skb_in_use = true; |
d2a7ac5d MM |
6178 | BT_DBG("Queued %p (queue len %d)", skb, |
6179 | skb_queue_len(&chan->srej_q)); | |
6180 | ||
6181 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
6182 | l2cap_seq_list_clear(&chan->srej_list); | |
6183 | l2cap_send_srej(chan, control->txseq); | |
6184 | ||
6185 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
6186 | break; | |
6187 | case L2CAP_TXSEQ_DUPLICATE: | |
6188 | l2cap_pass_to_tx(chan, control); | |
6189 | break; | |
6190 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6191 | break; | |
6192 | case L2CAP_TXSEQ_INVALID: | |
6193 | default: | |
5e4e3972 | 6194 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6195 | break; |
6196 | } | |
6197 | break; | |
6198 | case L2CAP_EV_RECV_RR: | |
6199 | l2cap_pass_to_tx(chan, control); | |
6200 | if (control->final) { | |
6201 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6202 | ||
e6a3ee6e MM |
6203 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
6204 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
6205 | control->final = 0; |
6206 | l2cap_retransmit_all(chan, control); | |
6207 | } | |
6208 | ||
6209 | l2cap_ertm_send(chan); | |
6210 | } else if (control->poll) { | |
6211 | l2cap_send_i_or_rr_or_rnr(chan); | |
6212 | } else { | |
6213 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6214 | &chan->conn_state) && | |
6215 | chan->unacked_frames) | |
6216 | __set_retrans_timer(chan); | |
6217 | ||
6218 | l2cap_ertm_send(chan); | |
6219 | } | |
6220 | break; | |
6221 | case L2CAP_EV_RECV_RNR: | |
6222 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6223 | l2cap_pass_to_tx(chan, control); | |
6224 | if (control && control->poll) { | |
6225 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6226 | l2cap_send_rr_or_rnr(chan, 0); | |
6227 | } | |
6228 | __clear_retrans_timer(chan); | |
6229 | l2cap_seq_list_clear(&chan->retrans_list); | |
6230 | break; | |
6231 | case L2CAP_EV_RECV_REJ: | |
6232 | l2cap_handle_rej(chan, control); | |
6233 | break; | |
6234 | case L2CAP_EV_RECV_SREJ: | |
6235 | l2cap_handle_srej(chan, control); | |
6236 | break; | |
6237 | default: | |
6238 | break; | |
6239 | } | |
6240 | ||
6241 | if (skb && !skb_in_use) { | |
6242 | BT_DBG("Freeing %p", skb); | |
6243 | kfree_skb(skb); | |
6244 | } | |
6245 | ||
6246 | return err; | |
6247 | } | |
6248 | ||
6249 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
6250 | struct l2cap_ctrl *control, | |
6251 | struct sk_buff *skb, u8 event) | |
6252 | { | |
6253 | int err = 0; | |
6254 | u16 txseq = control->txseq; | |
941247f9 | 6255 | bool skb_in_use = false; |
d2a7ac5d MM |
6256 | |
6257 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6258 | event); | |
6259 | ||
6260 | switch (event) { | |
6261 | case L2CAP_EV_RECV_IFRAME: | |
6262 | switch (l2cap_classify_txseq(chan, txseq)) { | |
6263 | case L2CAP_TXSEQ_EXPECTED: | |
6264 | /* Keep frame for reassembly later */ | |
6265 | l2cap_pass_to_tx(chan, control); | |
6266 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6267 | skb_in_use = true; |
d2a7ac5d MM |
6268 | BT_DBG("Queued %p (queue len %d)", skb, |
6269 | skb_queue_len(&chan->srej_q)); | |
6270 | ||
6271 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
6272 | break; | |
6273 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
6274 | l2cap_seq_list_pop(&chan->srej_list); | |
6275 | ||
6276 | l2cap_pass_to_tx(chan, control); | |
6277 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6278 | skb_in_use = true; |
d2a7ac5d MM |
6279 | BT_DBG("Queued %p (queue len %d)", skb, |
6280 | skb_queue_len(&chan->srej_q)); | |
6281 | ||
6282 | err = l2cap_rx_queued_iframes(chan); | |
6283 | if (err) | |
6284 | break; | |
6285 | ||
6286 | break; | |
6287 | case L2CAP_TXSEQ_UNEXPECTED: | |
6288 | /* Got a frame that can't be reassembled yet. | |
6289 | * Save it for later, and send SREJs to cover | |
6290 | * the missing frames. | |
6291 | */ | |
6292 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6293 | skb_in_use = true; |
d2a7ac5d MM |
6294 | BT_DBG("Queued %p (queue len %d)", skb, |
6295 | skb_queue_len(&chan->srej_q)); | |
6296 | ||
6297 | l2cap_pass_to_tx(chan, control); | |
6298 | l2cap_send_srej(chan, control->txseq); | |
6299 | break; | |
6300 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
6301 | /* This frame was requested with an SREJ, but | |
6302 | * some expected retransmitted frames are | |
6303 | * missing. Request retransmission of missing | |
6304 | * SREJ'd frames. | |
6305 | */ | |
6306 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6307 | skb_in_use = true; |
d2a7ac5d MM |
6308 | BT_DBG("Queued %p (queue len %d)", skb, |
6309 | skb_queue_len(&chan->srej_q)); | |
6310 | ||
6311 | l2cap_pass_to_tx(chan, control); | |
6312 | l2cap_send_srej_list(chan, control->txseq); | |
6313 | break; | |
6314 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
6315 | /* We've already queued this frame. Drop this copy. */ | |
6316 | l2cap_pass_to_tx(chan, control); | |
6317 | break; | |
6318 | case L2CAP_TXSEQ_DUPLICATE: | |
6319 | /* Expecting a later sequence number, so this frame | |
6320 | * was already received. Ignore it completely. | |
6321 | */ | |
6322 | break; | |
6323 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6324 | break; | |
6325 | case L2CAP_TXSEQ_INVALID: | |
6326 | default: | |
5e4e3972 | 6327 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6328 | break; |
6329 | } | |
6330 | break; | |
6331 | case L2CAP_EV_RECV_RR: | |
6332 | l2cap_pass_to_tx(chan, control); | |
6333 | if (control->final) { | |
6334 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6335 | ||
6336 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6337 | &chan->conn_state)) { | |
6338 | control->final = 0; | |
6339 | l2cap_retransmit_all(chan, control); | |
6340 | } | |
6341 | ||
6342 | l2cap_ertm_send(chan); | |
6343 | } else if (control->poll) { | |
6344 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6345 | &chan->conn_state) && | |
6346 | chan->unacked_frames) { | |
6347 | __set_retrans_timer(chan); | |
6348 | } | |
6349 | ||
6350 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6351 | l2cap_send_srej_tail(chan); | |
6352 | } else { | |
6353 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6354 | &chan->conn_state) && | |
6355 | chan->unacked_frames) | |
6356 | __set_retrans_timer(chan); | |
6357 | ||
6358 | l2cap_send_ack(chan); | |
6359 | } | |
6360 | break; | |
6361 | case L2CAP_EV_RECV_RNR: | |
6362 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6363 | l2cap_pass_to_tx(chan, control); | |
6364 | if (control->poll) { | |
6365 | l2cap_send_srej_tail(chan); | |
6366 | } else { | |
6367 | struct l2cap_ctrl rr_control; | |
6368 | memset(&rr_control, 0, sizeof(rr_control)); | |
6369 | rr_control.sframe = 1; | |
6370 | rr_control.super = L2CAP_SUPER_RR; | |
6371 | rr_control.reqseq = chan->buffer_seq; | |
6372 | l2cap_send_sframe(chan, &rr_control); | |
6373 | } | |
6374 | ||
6375 | break; | |
6376 | case L2CAP_EV_RECV_REJ: | |
6377 | l2cap_handle_rej(chan, control); | |
6378 | break; | |
6379 | case L2CAP_EV_RECV_SREJ: | |
6380 | l2cap_handle_srej(chan, control); | |
6381 | break; | |
6382 | } | |
6383 | ||
6384 | if (skb && !skb_in_use) { | |
6385 | BT_DBG("Freeing %p", skb); | |
6386 | kfree_skb(skb); | |
6387 | } | |
6388 | ||
6389 | return err; | |
6390 | } | |
6391 | ||
32b32735 MM |
6392 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6393 | { | |
6394 | BT_DBG("chan %p", chan); | |
6395 | ||
6396 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6397 | ||
6398 | if (chan->hs_hcon) | |
6399 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6400 | else | |
6401 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6402 | ||
6403 | return l2cap_resegment(chan); | |
6404 | } | |
6405 | ||
6406 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6407 | struct l2cap_ctrl *control, | |
6408 | struct sk_buff *skb, u8 event) | |
6409 | { | |
6410 | int err; | |
6411 | ||
6412 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6413 | event); | |
6414 | ||
6415 | if (!control->poll) | |
6416 | return -EPROTO; | |
6417 | ||
6418 | l2cap_process_reqseq(chan, control->reqseq); | |
6419 | ||
6420 | if (!skb_queue_empty(&chan->tx_q)) | |
6421 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6422 | else | |
6423 | chan->tx_send_head = NULL; | |
6424 | ||
6425 | /* Rewind next_tx_seq to the point expected | |
6426 | * by the receiver. | |
6427 | */ | |
6428 | chan->next_tx_seq = control->reqseq; | |
6429 | chan->unacked_frames = 0; | |
6430 | ||
6431 | err = l2cap_finish_move(chan); | |
6432 | if (err) | |
6433 | return err; | |
6434 | ||
6435 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6436 | l2cap_send_i_or_rr_or_rnr(chan); | |
6437 | ||
6438 | if (event == L2CAP_EV_RECV_IFRAME) | |
6439 | return -EPROTO; | |
6440 | ||
6441 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6442 | } | |
6443 | ||
6444 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6445 | struct l2cap_ctrl *control, | |
6446 | struct sk_buff *skb, u8 event) | |
6447 | { | |
6448 | int err; | |
6449 | ||
6450 | if (!control->final) | |
6451 | return -EPROTO; | |
6452 | ||
6453 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6454 | ||
6455 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6456 | l2cap_process_reqseq(chan, control->reqseq); | |
6457 | ||
6458 | if (!skb_queue_empty(&chan->tx_q)) | |
6459 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6460 | else | |
6461 | chan->tx_send_head = NULL; | |
6462 | ||
6463 | /* Rewind next_tx_seq to the point expected | |
6464 | * by the receiver. | |
6465 | */ | |
6466 | chan->next_tx_seq = control->reqseq; | |
6467 | chan->unacked_frames = 0; | |
6468 | ||
6469 | if (chan->hs_hcon) | |
6470 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6471 | else | |
6472 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6473 | ||
6474 | err = l2cap_resegment(chan); | |
6475 | ||
6476 | if (!err) | |
6477 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6478 | ||
6479 | return err; | |
6480 | } | |
6481 | ||
d2a7ac5d MM |
6482 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6483 | { | |
6484 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6485 | u16 unacked; | |
6486 | ||
6487 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6488 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6489 | } | |
6490 | ||
cec8ab6e MM |
6491 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6492 | struct sk_buff *skb, u8 event) | |
218bb9df | 6493 | { |
d2a7ac5d MM |
6494 | int err = 0; |
6495 | ||
6496 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6497 | control, skb, event, chan->rx_state); | |
6498 | ||
6499 | if (__valid_reqseq(chan, control->reqseq)) { | |
6500 | switch (chan->rx_state) { | |
6501 | case L2CAP_RX_STATE_RECV: | |
6502 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6503 | break; | |
6504 | case L2CAP_RX_STATE_SREJ_SENT: | |
6505 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6506 | event); | |
6507 | break; | |
32b32735 MM |
6508 | case L2CAP_RX_STATE_WAIT_P: |
6509 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6510 | break; | |
6511 | case L2CAP_RX_STATE_WAIT_F: | |
6512 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6513 | break; | |
d2a7ac5d MM |
6514 | default: |
6515 | /* shut it down */ | |
6516 | break; | |
6517 | } | |
6518 | } else { | |
6519 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6520 | control->reqseq, chan->next_tx_seq, | |
6521 | chan->expected_ack_seq); | |
5e4e3972 | 6522 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6523 | } |
6524 | ||
6525 | return err; | |
cec8ab6e MM |
6526 | } |
6527 | ||
6528 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6529 | struct sk_buff *skb) | |
6530 | { | |
4b51dae9 MM |
6531 | int err = 0; |
6532 | ||
6533 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, | |
6534 | chan->rx_state); | |
6535 | ||
6536 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6537 | L2CAP_TXSEQ_EXPECTED) { | |
6538 | l2cap_pass_to_tx(chan, control); | |
6539 | ||
6540 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6541 | __next_seq(chan, chan->buffer_seq)); | |
6542 | ||
6543 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6544 | ||
6545 | l2cap_reassemble_sdu(chan, skb, control); | |
6546 | } else { | |
6547 | if (chan->sdu) { | |
6548 | kfree_skb(chan->sdu); | |
6549 | chan->sdu = NULL; | |
6550 | } | |
6551 | chan->sdu_last_frag = NULL; | |
6552 | chan->sdu_len = 0; | |
6553 | ||
6554 | if (skb) { | |
6555 | BT_DBG("Freeing %p", skb); | |
6556 | kfree_skb(skb); | |
6557 | } | |
6558 | } | |
6559 | ||
6560 | chan->last_acked_seq = control->txseq; | |
6561 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6562 | ||
6563 | return err; | |
cec8ab6e MM |
6564 | } |
6565 | ||
6566 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6567 | { | |
a4368ff3 | 6568 | struct l2cap_ctrl *control = &bt_cb(skb)->l2cap; |
cec8ab6e MM |
6569 | u16 len; |
6570 | u8 event; | |
218bb9df | 6571 | |
b76bbd66 MM |
6572 | __unpack_control(chan, skb); |
6573 | ||
218bb9df GP |
6574 | len = skb->len; |
6575 | ||
6576 | /* | |
6577 | * We can just drop the corrupted I-frame here. | |
6578 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6579 | * procedures and ask for retransmission. |
218bb9df | 6580 | */ |
47d1ec61 | 6581 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6582 | goto drop; |
6583 | ||
cec8ab6e | 6584 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6585 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6586 | |
47d1ec61 | 6587 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6588 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6589 | |
47d1ec61 | 6590 | if (len > chan->mps) { |
5e4e3972 | 6591 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6592 | goto drop; |
6593 | } | |
6594 | ||
cec8ab6e MM |
6595 | if (!control->sframe) { |
6596 | int err; | |
218bb9df | 6597 | |
cec8ab6e MM |
6598 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6599 | control->sar, control->reqseq, control->final, | |
6600 | control->txseq); | |
218bb9df | 6601 | |
cec8ab6e MM |
6602 | /* Validate F-bit - F=0 always valid, F=1 only |
6603 | * valid in TX WAIT_F | |
6604 | */ | |
6605 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6606 | goto drop; |
cec8ab6e MM |
6607 | |
6608 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6609 | event = L2CAP_EV_RECV_IFRAME; | |
6610 | err = l2cap_rx(chan, control, skb, event); | |
6611 | } else { | |
6612 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6613 | } |
6614 | ||
cec8ab6e | 6615 | if (err) |
5e4e3972 | 6616 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6617 | } else { |
cec8ab6e MM |
6618 | const u8 rx_func_to_event[4] = { |
6619 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6620 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6621 | }; | |
6622 | ||
6623 | /* Only I-frames are expected in streaming mode */ | |
6624 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6625 | goto drop; | |
6626 | ||
6627 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6628 | control->reqseq, control->final, control->poll, | |
6629 | control->super); | |
6630 | ||
218bb9df | 6631 | if (len != 0) { |
1bb166e6 | 6632 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6633 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6634 | goto drop; |
6635 | } | |
6636 | ||
cec8ab6e MM |
6637 | /* Validate F and P bits */ |
6638 | if (control->final && (control->poll || | |
6639 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6640 | goto drop; | |
6641 | ||
6642 | event = rx_func_to_event[control->super]; | |
6643 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6644 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6645 | } |
6646 | ||
6647 | return 0; | |
6648 | ||
6649 | drop: | |
6650 | kfree_skb(skb); | |
6651 | return 0; | |
6652 | } | |
6653 | ||
b1c325c2 JH |
6654 | static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) |
6655 | { | |
6656 | struct l2cap_conn *conn = chan->conn; | |
6657 | struct l2cap_le_credits pkt; | |
6658 | u16 return_credits; | |
6659 | ||
6660 | /* We return more credits to the sender only after the amount of | |
6661 | * credits falls below half of the initial amount. | |
6662 | */ | |
f15b8ecf | 6663 | if (chan->rx_credits >= (le_max_credits + 1) / 2) |
b1c325c2 JH |
6664 | return; |
6665 | ||
f15b8ecf | 6666 | return_credits = le_max_credits - chan->rx_credits; |
b1c325c2 JH |
6667 | |
6668 | BT_DBG("chan %p returning %u credits to sender", chan, return_credits); | |
6669 | ||
6670 | chan->rx_credits += return_credits; | |
6671 | ||
6672 | pkt.cid = cpu_to_le16(chan->scid); | |
6673 | pkt.credits = cpu_to_le16(return_credits); | |
6674 | ||
6675 | chan->ident = l2cap_get_ident(conn); | |
6676 | ||
6677 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); | |
6678 | } | |
6679 | ||
fad5fc89 JH |
6680 | static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
6681 | { | |
aac23bf6 JH |
6682 | int err; |
6683 | ||
6684 | if (!chan->rx_credits) { | |
6685 | BT_ERR("No credits to receive LE L2CAP data"); | |
dfd9774c | 6686 | l2cap_send_disconn_req(chan, ECONNRESET); |
fad5fc89 | 6687 | return -ENOBUFS; |
aac23bf6 | 6688 | } |
fad5fc89 | 6689 | |
aac23bf6 JH |
6690 | if (chan->imtu < skb->len) { |
6691 | BT_ERR("Too big LE L2CAP PDU"); | |
fad5fc89 | 6692 | return -ENOBUFS; |
aac23bf6 | 6693 | } |
fad5fc89 JH |
6694 | |
6695 | chan->rx_credits--; | |
6696 | BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); | |
6697 | ||
6698 | l2cap_chan_le_send_credits(chan); | |
6699 | ||
aac23bf6 JH |
6700 | err = 0; |
6701 | ||
6702 | if (!chan->sdu) { | |
6703 | u16 sdu_len; | |
6704 | ||
6705 | sdu_len = get_unaligned_le16(skb->data); | |
6706 | skb_pull(skb, L2CAP_SDULEN_SIZE); | |
6707 | ||
6708 | BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", | |
6709 | sdu_len, skb->len, chan->imtu); | |
6710 | ||
6711 | if (sdu_len > chan->imtu) { | |
6712 | BT_ERR("Too big LE L2CAP SDU length received"); | |
6713 | err = -EMSGSIZE; | |
6714 | goto failed; | |
6715 | } | |
6716 | ||
6717 | if (skb->len > sdu_len) { | |
6718 | BT_ERR("Too much LE L2CAP data received"); | |
6719 | err = -EINVAL; | |
6720 | goto failed; | |
6721 | } | |
6722 | ||
6723 | if (skb->len == sdu_len) | |
6724 | return chan->ops->recv(chan, skb); | |
6725 | ||
6726 | chan->sdu = skb; | |
6727 | chan->sdu_len = sdu_len; | |
6728 | chan->sdu_last_frag = skb; | |
6729 | ||
6730 | return 0; | |
6731 | } | |
6732 | ||
6733 | BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", | |
6734 | chan->sdu->len, skb->len, chan->sdu_len); | |
6735 | ||
6736 | if (chan->sdu->len + skb->len > chan->sdu_len) { | |
6737 | BT_ERR("Too much LE L2CAP data received"); | |
6738 | err = -EINVAL; | |
6739 | goto failed; | |
6740 | } | |
6741 | ||
6742 | append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); | |
6743 | skb = NULL; | |
6744 | ||
6745 | if (chan->sdu->len == chan->sdu_len) { | |
6746 | err = chan->ops->recv(chan, chan->sdu); | |
6747 | if (!err) { | |
6748 | chan->sdu = NULL; | |
6749 | chan->sdu_last_frag = NULL; | |
6750 | chan->sdu_len = 0; | |
6751 | } | |
6752 | } | |
6753 | ||
6754 | failed: | |
6755 | if (err) { | |
6756 | kfree_skb(skb); | |
6757 | kfree_skb(chan->sdu); | |
6758 | chan->sdu = NULL; | |
6759 | chan->sdu_last_frag = NULL; | |
6760 | chan->sdu_len = 0; | |
6761 | } | |
6762 | ||
6763 | /* We can't return an error here since we took care of the skb | |
6764 | * freeing internally. An error return would cause the caller to | |
6765 | * do a double-free of the skb. | |
6766 | */ | |
6767 | return 0; | |
fad5fc89 JH |
6768 | } |
6769 | ||
13ca56e0 AE |
6770 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6771 | struct sk_buff *skb) | |
1da177e4 | 6772 | { |
48454079 | 6773 | struct l2cap_chan *chan; |
1da177e4 | 6774 | |
baa7e1fa | 6775 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6776 | if (!chan) { |
97e8e89d AE |
6777 | if (cid == L2CAP_CID_A2MP) { |
6778 | chan = a2mp_channel_create(conn, skb); | |
6779 | if (!chan) { | |
6780 | kfree_skb(skb); | |
13ca56e0 | 6781 | return; |
97e8e89d AE |
6782 | } |
6783 | ||
6784 | l2cap_chan_lock(chan); | |
6785 | } else { | |
6786 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6787 | /* Drop packet and return */ | |
6788 | kfree_skb(skb); | |
13ca56e0 | 6789 | return; |
97e8e89d | 6790 | } |
1da177e4 LT |
6791 | } |
6792 | ||
49208c9c | 6793 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6794 | |
315917e0 JH |
6795 | /* If we receive data on a fixed channel before the info req/rsp |
6796 | * procdure is done simply assume that the channel is supported | |
6797 | * and mark it as ready. | |
6798 | */ | |
6799 | if (chan->chan_type == L2CAP_CHAN_FIXED) | |
6800 | l2cap_chan_ready(chan); | |
6801 | ||
89bc500e | 6802 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6803 | goto drop; |
6804 | ||
0c1bc5c6 | 6805 | switch (chan->mode) { |
38319713 | 6806 | case L2CAP_MODE_LE_FLOWCTL: |
fad5fc89 JH |
6807 | if (l2cap_le_data_rcv(chan, skb) < 0) |
6808 | goto drop; | |
6809 | ||
6810 | goto done; | |
6811 | ||
1c2acffb GP |
6812 | case L2CAP_MODE_BASIC: |
6813 | /* If socket recv buffers overflows we drop data here | |
6814 | * which is *bad* because L2CAP has to be reliable. | |
6815 | * But we don't have any other choice. L2CAP doesn't | |
6816 | * provide flow control mechanism. */ | |
1da177e4 | 6817 | |
2c96e03d SJ |
6818 | if (chan->imtu < skb->len) { |
6819 | BT_ERR("Dropping L2CAP data: receive buffer overflow"); | |
1c2acffb | 6820 | goto drop; |
2c96e03d | 6821 | } |
1da177e4 | 6822 | |
80b98027 | 6823 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6824 | goto done; |
6825 | break; | |
6826 | ||
6827 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6828 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6829 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6830 | goto done; |
6831 | ||
1c2acffb | 6832 | default: |
0c1bc5c6 | 6833 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6834 | break; |
6835 | } | |
1da177e4 LT |
6836 | |
6837 | drop: | |
6838 | kfree_skb(skb); | |
6839 | ||
6840 | done: | |
6be36555 | 6841 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6842 | } |
6843 | ||
84104b24 AE |
6844 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6845 | struct sk_buff *skb) | |
1da177e4 | 6846 | { |
ae4fd2d3 | 6847 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6848 | struct l2cap_chan *chan; |
1da177e4 | 6849 | |
ae4fd2d3 | 6850 | if (hcon->type != ACL_LINK) |
a24cce14 | 6851 | goto free_skb; |
ae4fd2d3 | 6852 | |
bf20fd4e JH |
6853 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, |
6854 | ACL_LINK); | |
23691d75 | 6855 | if (!chan) |
a24cce14 | 6856 | goto free_skb; |
1da177e4 | 6857 | |
5b4cedaa | 6858 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6859 | |
89bc500e | 6860 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6861 | goto drop; |
6862 | ||
e13e21dc | 6863 | if (chan->imtu < skb->len) |
1da177e4 LT |
6864 | goto drop; |
6865 | ||
2edf870d | 6866 | /* Store remote BD_ADDR and PSM for msg_name */ |
a4368ff3 JH |
6867 | bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst); |
6868 | bt_cb(skb)->l2cap.psm = psm; | |
2edf870d | 6869 | |
a24cce14 JH |
6870 | if (!chan->ops->recv(chan, skb)) { |
6871 | l2cap_chan_put(chan); | |
84104b24 | 6872 | return; |
a24cce14 | 6873 | } |
1da177e4 LT |
6874 | |
6875 | drop: | |
a24cce14 JH |
6876 | l2cap_chan_put(chan); |
6877 | free_skb: | |
1da177e4 | 6878 | kfree_skb(skb); |
1da177e4 LT |
6879 | } |
6880 | ||
6881 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
6882 | { | |
6883 | struct l2cap_hdr *lh = (void *) skb->data; | |
61a939c6 | 6884 | struct hci_conn *hcon = conn->hcon; |
8e036fc3 AV |
6885 | u16 cid, len; |
6886 | __le16 psm; | |
1da177e4 | 6887 | |
61a939c6 JH |
6888 | if (hcon->state != BT_CONNECTED) { |
6889 | BT_DBG("queueing pending rx skb"); | |
6890 | skb_queue_tail(&conn->pending_rx, skb); | |
6891 | return; | |
6892 | } | |
6893 | ||
1da177e4 LT |
6894 | skb_pull(skb, L2CAP_HDR_SIZE); |
6895 | cid = __le16_to_cpu(lh->cid); | |
6896 | len = __le16_to_cpu(lh->len); | |
6897 | ||
1c2acffb GP |
6898 | if (len != skb->len) { |
6899 | kfree_skb(skb); | |
6900 | return; | |
6901 | } | |
6902 | ||
9e1d7e15 JH |
6903 | /* Since we can't actively block incoming LE connections we must |
6904 | * at least ensure that we ignore incoming data from them. | |
6905 | */ | |
6906 | if (hcon->type == LE_LINK && | |
dcc36c16 | 6907 | hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst, |
a250e048 | 6908 | bdaddr_dst_type(hcon))) { |
e493150e JH |
6909 | kfree_skb(skb); |
6910 | return; | |
6911 | } | |
6912 | ||
1da177e4 LT |
6913 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6914 | ||
6915 | switch (cid) { | |
8db4dc46 | 6916 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6917 | l2cap_sig_channel(conn, skb); |
6918 | break; | |
6919 | ||
8db4dc46 | 6920 | case L2CAP_CID_CONN_LESS: |
097db76c | 6921 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6922 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6923 | l2cap_conless_channel(conn, psm, skb); |
6924 | break; | |
6925 | ||
a2877629 MH |
6926 | case L2CAP_CID_LE_SIGNALING: |
6927 | l2cap_le_sig_channel(conn, skb); | |
6928 | break; | |
6929 | ||
1da177e4 LT |
6930 | default: |
6931 | l2cap_data_channel(conn, cid, skb); | |
6932 | break; | |
6933 | } | |
6934 | } | |
6935 | ||
61a939c6 JH |
6936 | static void process_pending_rx(struct work_struct *work) |
6937 | { | |
6938 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, | |
6939 | pending_rx_work); | |
6940 | struct sk_buff *skb; | |
6941 | ||
6942 | BT_DBG(""); | |
6943 | ||
6944 | while ((skb = skb_dequeue(&conn->pending_rx))) | |
6945 | l2cap_recv_frame(conn, skb); | |
6946 | } | |
6947 | ||
162b49e7 JH |
6948 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
6949 | { | |
6950 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6951 | struct hci_chan *hchan; | |
6952 | ||
6953 | if (conn) | |
6954 | return conn; | |
6955 | ||
6956 | hchan = hci_chan_create(hcon); | |
6957 | if (!hchan) | |
6958 | return NULL; | |
6959 | ||
27f70f3e | 6960 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); |
162b49e7 JH |
6961 | if (!conn) { |
6962 | hci_chan_del(hchan); | |
6963 | return NULL; | |
6964 | } | |
6965 | ||
6966 | kref_init(&conn->ref); | |
6967 | hcon->l2cap_data = conn; | |
51bb8457 | 6968 | conn->hcon = hci_conn_get(hcon); |
162b49e7 JH |
6969 | conn->hchan = hchan; |
6970 | ||
6971 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); | |
6972 | ||
6973 | switch (hcon->type) { | |
6974 | case LE_LINK: | |
6975 | if (hcon->hdev->le_mtu) { | |
6976 | conn->mtu = hcon->hdev->le_mtu; | |
6977 | break; | |
6978 | } | |
6979 | /* fall through */ | |
6980 | default: | |
6981 | conn->mtu = hcon->hdev->acl_mtu; | |
6982 | break; | |
6983 | } | |
6984 | ||
6985 | conn->feat_mask = 0; | |
6986 | ||
0bd49fc7 JH |
6987 | conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS; |
6988 | ||
6989 | if (hcon->type == ACL_LINK && | |
d7a5a11d | 6990 | hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED)) |
0bd49fc7 | 6991 | conn->local_fixed_chan |= L2CAP_FC_A2MP; |
162b49e7 | 6992 | |
d7a5a11d | 6993 | if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) && |
f9be9e86 | 6994 | (bredr_sc_enabled(hcon->hdev) || |
b7cb93e5 | 6995 | hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP))) |
b5ae344d JH |
6996 | conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR; |
6997 | ||
5a54e7c8 | 6998 | mutex_init(&conn->ident_lock); |
162b49e7 JH |
6999 | mutex_init(&conn->chan_lock); |
7000 | ||
7001 | INIT_LIST_HEAD(&conn->chan_l); | |
7002 | INIT_LIST_HEAD(&conn->users); | |
7003 | ||
276d8073 | 7004 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
162b49e7 | 7005 | |
61a939c6 JH |
7006 | skb_queue_head_init(&conn->pending_rx); |
7007 | INIT_WORK(&conn->pending_rx_work, process_pending_rx); | |
f3d82d0c | 7008 | INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr); |
61a939c6 | 7009 | |
162b49e7 JH |
7010 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
7011 | ||
7012 | return conn; | |
7013 | } | |
7014 | ||
7015 | static bool is_valid_psm(u16 psm, u8 dst_type) { | |
7016 | if (!psm) | |
7017 | return false; | |
7018 | ||
7019 | if (bdaddr_type_is_le(dst_type)) | |
7020 | return (psm <= 0x00ff); | |
7021 | ||
7022 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
7023 | return ((psm & 0x0101) == 0x0001); | |
7024 | } | |
7025 | ||
7026 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, | |
7027 | bdaddr_t *dst, u8 dst_type) | |
7028 | { | |
7029 | struct l2cap_conn *conn; | |
7030 | struct hci_conn *hcon; | |
7031 | struct hci_dev *hdev; | |
162b49e7 JH |
7032 | int err; |
7033 | ||
7034 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, | |
7035 | dst_type, __le16_to_cpu(psm)); | |
7036 | ||
7037 | hdev = hci_get_route(dst, &chan->src); | |
7038 | if (!hdev) | |
7039 | return -EHOSTUNREACH; | |
7040 | ||
7041 | hci_dev_lock(hdev); | |
7042 | ||
162b49e7 JH |
7043 | if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && |
7044 | chan->chan_type != L2CAP_CHAN_RAW) { | |
7045 | err = -EINVAL; | |
7046 | goto done; | |
7047 | } | |
7048 | ||
21626e62 JH |
7049 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { |
7050 | err = -EINVAL; | |
7051 | goto done; | |
7052 | } | |
7053 | ||
7054 | if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { | |
162b49e7 JH |
7055 | err = -EINVAL; |
7056 | goto done; | |
7057 | } | |
7058 | ||
7059 | switch (chan->mode) { | |
7060 | case L2CAP_MODE_BASIC: | |
7061 | break; | |
7062 | case L2CAP_MODE_LE_FLOWCTL: | |
7063 | l2cap_le_flowctl_init(chan); | |
7064 | break; | |
7065 | case L2CAP_MODE_ERTM: | |
7066 | case L2CAP_MODE_STREAMING: | |
7067 | if (!disable_ertm) | |
7068 | break; | |
7069 | /* fall through */ | |
7070 | default: | |
beb19e4c | 7071 | err = -EOPNOTSUPP; |
162b49e7 JH |
7072 | goto done; |
7073 | } | |
7074 | ||
7075 | switch (chan->state) { | |
7076 | case BT_CONNECT: | |
7077 | case BT_CONNECT2: | |
7078 | case BT_CONFIG: | |
7079 | /* Already connecting */ | |
7080 | err = 0; | |
7081 | goto done; | |
7082 | ||
7083 | case BT_CONNECTED: | |
7084 | /* Already connected */ | |
7085 | err = -EISCONN; | |
7086 | goto done; | |
7087 | ||
7088 | case BT_OPEN: | |
7089 | case BT_BOUND: | |
7090 | /* Can connect */ | |
7091 | break; | |
7092 | ||
7093 | default: | |
7094 | err = -EBADFD; | |
7095 | goto done; | |
7096 | } | |
7097 | ||
7098 | /* Set destination address and psm */ | |
7099 | bacpy(&chan->dst, dst); | |
7100 | chan->dst_type = dst_type; | |
7101 | ||
7102 | chan->psm = psm; | |
7103 | chan->dcid = cid; | |
7104 | ||
6f77d8c7 | 7105 | if (bdaddr_type_is_le(dst_type)) { |
e804d25d | 7106 | u8 role; |
cdd6275e | 7107 | |
6f77d8c7 AG |
7108 | /* Convert from L2CAP channel address type to HCI address type |
7109 | */ | |
7110 | if (dst_type == BDADDR_LE_PUBLIC) | |
7111 | dst_type = ADDR_LE_DEV_PUBLIC; | |
7112 | else | |
7113 | dst_type = ADDR_LE_DEV_RANDOM; | |
7114 | ||
d7a5a11d | 7115 | if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) |
e804d25d JH |
7116 | role = HCI_ROLE_SLAVE; |
7117 | else | |
7118 | role = HCI_ROLE_MASTER; | |
cdd6275e | 7119 | |
04a6c589 | 7120 | hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level, |
e804d25d | 7121 | HCI_LE_CONN_TIMEOUT, role); |
6f77d8c7 | 7122 | } else { |
d93375a8 | 7123 | u8 auth_type = l2cap_get_auth_type(chan); |
04a6c589 | 7124 | hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type); |
6f77d8c7 | 7125 | } |
162b49e7 JH |
7126 | |
7127 | if (IS_ERR(hcon)) { | |
7128 | err = PTR_ERR(hcon); | |
7129 | goto done; | |
7130 | } | |
7131 | ||
7132 | conn = l2cap_conn_add(hcon); | |
7133 | if (!conn) { | |
7134 | hci_conn_drop(hcon); | |
7135 | err = -ENOMEM; | |
7136 | goto done; | |
7137 | } | |
7138 | ||
02e246ae JH |
7139 | mutex_lock(&conn->chan_lock); |
7140 | l2cap_chan_lock(chan); | |
7141 | ||
162b49e7 JH |
7142 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { |
7143 | hci_conn_drop(hcon); | |
7144 | err = -EBUSY; | |
02e246ae | 7145 | goto chan_unlock; |
162b49e7 JH |
7146 | } |
7147 | ||
7148 | /* Update source addr of the socket */ | |
7149 | bacpy(&chan->src, &hcon->src); | |
a250e048 | 7150 | chan->src_type = bdaddr_src_type(hcon); |
162b49e7 | 7151 | |
02e246ae | 7152 | __l2cap_chan_add(conn, chan); |
162b49e7 JH |
7153 | |
7154 | /* l2cap_chan_add takes its own ref so we can drop this one */ | |
7155 | hci_conn_drop(hcon); | |
7156 | ||
7157 | l2cap_state_change(chan, BT_CONNECT); | |
7158 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
7159 | ||
61202e4d JH |
7160 | /* Release chan->sport so that it can be reused by other |
7161 | * sockets (as it's only used for listening sockets). | |
7162 | */ | |
7163 | write_lock(&chan_list_lock); | |
7164 | chan->sport = 0; | |
7165 | write_unlock(&chan_list_lock); | |
7166 | ||
162b49e7 JH |
7167 | if (hcon->state == BT_CONNECTED) { |
7168 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { | |
7169 | __clear_chan_timer(chan); | |
e7cafc45 | 7170 | if (l2cap_chan_check_security(chan, true)) |
162b49e7 JH |
7171 | l2cap_state_change(chan, BT_CONNECTED); |
7172 | } else | |
7173 | l2cap_do_start(chan); | |
7174 | } | |
7175 | ||
7176 | err = 0; | |
7177 | ||
02e246ae | 7178 | chan_unlock: |
162b49e7 | 7179 | l2cap_chan_unlock(chan); |
02e246ae JH |
7180 | mutex_unlock(&conn->chan_lock); |
7181 | done: | |
162b49e7 JH |
7182 | hci_dev_unlock(hdev); |
7183 | hci_dev_put(hdev); | |
7184 | return err; | |
7185 | } | |
6b8d4a6a | 7186 | EXPORT_SYMBOL_GPL(l2cap_chan_connect); |
162b49e7 | 7187 | |
1da177e4 LT |
7188 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
7189 | ||
686ebf28 | 7190 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
7191 | { |
7192 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 7193 | struct l2cap_chan *c; |
1da177e4 | 7194 | |
6ed93dc6 | 7195 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
7196 | |
7197 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
7198 | read_lock(&chan_list_lock); |
7199 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 7200 | if (c->state != BT_LISTEN) |
1da177e4 LT |
7201 | continue; |
7202 | ||
7eafc59e | 7203 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 7204 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 7205 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 7206 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 7207 | exact++; |
7eafc59e | 7208 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 7209 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 7210 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
7211 | lm2 |= HCI_LM_MASTER; |
7212 | } | |
1da177e4 | 7213 | } |
23691d75 | 7214 | read_unlock(&chan_list_lock); |
1da177e4 LT |
7215 | |
7216 | return exact ? lm1 : lm2; | |
7217 | } | |
7218 | ||
e760ec12 JH |
7219 | /* Find the next fixed channel in BT_LISTEN state, continue iteration |
7220 | * from an existing channel in the list or from the beginning of the | |
7221 | * global list (by passing NULL as first parameter). | |
7222 | */ | |
7223 | static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c, | |
327a7191 | 7224 | struct hci_conn *hcon) |
e760ec12 | 7225 | { |
327a7191 JH |
7226 | u8 src_type = bdaddr_src_type(hcon); |
7227 | ||
e760ec12 JH |
7228 | read_lock(&chan_list_lock); |
7229 | ||
7230 | if (c) | |
7231 | c = list_next_entry(c, global_l); | |
7232 | else | |
7233 | c = list_entry(chan_list.next, typeof(*c), global_l); | |
7234 | ||
7235 | list_for_each_entry_from(c, &chan_list, global_l) { | |
7236 | if (c->chan_type != L2CAP_CHAN_FIXED) | |
7237 | continue; | |
7238 | if (c->state != BT_LISTEN) | |
7239 | continue; | |
327a7191 | 7240 | if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY)) |
54a1b626 | 7241 | continue; |
327a7191 | 7242 | if (src_type != c->src_type) |
54a1b626 | 7243 | continue; |
e760ec12 JH |
7244 | |
7245 | l2cap_chan_hold(c); | |
7246 | read_unlock(&chan_list_lock); | |
7247 | return c; | |
7248 | } | |
7249 | ||
7250 | read_unlock(&chan_list_lock); | |
7251 | ||
7252 | return NULL; | |
7253 | } | |
7254 | ||
539c496d | 7255 | static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 7256 | { |
e760ec12 | 7257 | struct hci_dev *hdev = hcon->hdev; |
0139418c | 7258 | struct l2cap_conn *conn; |
e760ec12 JH |
7259 | struct l2cap_chan *pchan; |
7260 | u8 dst_type; | |
0139418c | 7261 | |
539c496d JH |
7262 | if (hcon->type != ACL_LINK && hcon->type != LE_LINK) |
7263 | return; | |
7264 | ||
6ed93dc6 | 7265 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 7266 | |
dc0f5088 | 7267 | if (status) { |
e175072f | 7268 | l2cap_conn_del(hcon, bt_to_errno(status)); |
dc0f5088 | 7269 | return; |
ba6fc317 | 7270 | } |
dc0f5088 JH |
7271 | |
7272 | conn = l2cap_conn_add(hcon); | |
7273 | if (!conn) | |
7274 | return; | |
7275 | ||
a250e048 | 7276 | dst_type = bdaddr_dst_type(hcon); |
e760ec12 JH |
7277 | |
7278 | /* If device is blocked, do not create channels for it */ | |
7279 | if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type)) | |
7280 | return; | |
7281 | ||
7282 | /* Find fixed channels and notify them of the new connection. We | |
7283 | * use multiple individual lookups, continuing each time where | |
7284 | * we left off, because the list lock would prevent calling the | |
7285 | * potentially sleeping l2cap_chan_lock() function. | |
7286 | */ | |
327a7191 | 7287 | pchan = l2cap_global_fixed_chan(NULL, hcon); |
e760ec12 JH |
7288 | while (pchan) { |
7289 | struct l2cap_chan *chan, *next; | |
7290 | ||
7291 | /* Client fixed channels should override server ones */ | |
7292 | if (__l2cap_get_chan_by_dcid(conn, pchan->scid)) | |
7293 | goto next; | |
7294 | ||
7295 | l2cap_chan_lock(pchan); | |
7296 | chan = pchan->ops->new_connection(pchan); | |
7297 | if (chan) { | |
7298 | bacpy(&chan->src, &hcon->src); | |
7299 | bacpy(&chan->dst, &hcon->dst); | |
a250e048 | 7300 | chan->src_type = bdaddr_src_type(hcon); |
e760ec12 JH |
7301 | chan->dst_type = dst_type; |
7302 | ||
7303 | __l2cap_chan_add(conn, chan); | |
7304 | } | |
7305 | ||
7306 | l2cap_chan_unlock(pchan); | |
7307 | next: | |
327a7191 | 7308 | next = l2cap_global_fixed_chan(pchan, hcon); |
e760ec12 JH |
7309 | l2cap_chan_put(pchan); |
7310 | pchan = next; | |
7311 | } | |
7312 | ||
dc0f5088 | 7313 | l2cap_conn_ready(conn); |
1da177e4 LT |
7314 | } |
7315 | ||
686ebf28 | 7316 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
7317 | { |
7318 | struct l2cap_conn *conn = hcon->l2cap_data; | |
7319 | ||
7320 | BT_DBG("hcon %p", hcon); | |
7321 | ||
686ebf28 | 7322 | if (!conn) |
9f5a0d7b | 7323 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
7324 | return conn->disc_reason; |
7325 | } | |
7326 | ||
3a6d576b | 7327 | static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 | 7328 | { |
3a6d576b JH |
7329 | if (hcon->type != ACL_LINK && hcon->type != LE_LINK) |
7330 | return; | |
7331 | ||
1da177e4 LT |
7332 | BT_DBG("hcon %p reason %d", hcon, reason); |
7333 | ||
e175072f | 7334 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
7335 | } |
7336 | ||
4343478f | 7337 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 7338 | { |
715ec005 | 7339 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
7340 | return; |
7341 | ||
f62e4323 | 7342 | if (encrypt == 0x00) { |
4343478f | 7343 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 7344 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
7d513e92 MH |
7345 | } else if (chan->sec_level == BT_SECURITY_HIGH || |
7346 | chan->sec_level == BT_SECURITY_FIPS) | |
0f852724 | 7347 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 7348 | } else { |
4343478f | 7349 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 7350 | __clear_chan_timer(chan); |
f62e4323 MH |
7351 | } |
7352 | } | |
7353 | ||
354fe804 | 7354 | static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 7355 | { |
0139418c | 7356 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 7357 | struct l2cap_chan *chan; |
1da177e4 | 7358 | |
0139418c | 7359 | if (!conn) |
354fe804 | 7360 | return; |
0139418c | 7361 | |
89d8b407 | 7362 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 7363 | |
3df91ea2 | 7364 | mutex_lock(&conn->chan_lock); |
1da177e4 | 7365 | |
3df91ea2 | 7366 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 7367 | l2cap_chan_lock(chan); |
1da177e4 | 7368 | |
89d8b407 AE |
7369 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
7370 | state_to_string(chan->state)); | |
f1cb9af5 | 7371 | |
2338a7e0 | 7372 | if (chan->scid == L2CAP_CID_A2MP) { |
78eb2f98 AE |
7373 | l2cap_chan_unlock(chan); |
7374 | continue; | |
7375 | } | |
7376 | ||
191eb398 JH |
7377 | if (!status && encrypt) |
7378 | chan->sec_level = hcon->sec_level; | |
f1cb9af5 | 7379 | |
96eff46e | 7380 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 7381 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
7382 | continue; |
7383 | } | |
7384 | ||
89bc500e | 7385 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 7386 | chan->state == BT_CONFIG)) { |
d97c899b | 7387 | chan->ops->resume(chan); |
4343478f | 7388 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 7389 | l2cap_chan_unlock(chan); |
9719f8af MH |
7390 | continue; |
7391 | } | |
7392 | ||
89bc500e | 7393 | if (chan->state == BT_CONNECT) { |
6d3c15da | 7394 | if (!status) |
93c3e8f5 | 7395 | l2cap_start_connection(chan); |
6d3c15da | 7396 | else |
ba13ccd9 | 7397 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
fa37c1aa JH |
7398 | } else if (chan->state == BT_CONNECT2 && |
7399 | chan->mode != L2CAP_MODE_LE_FLOWCTL) { | |
b1235d79 | 7400 | struct l2cap_conn_rsp rsp; |
df3c3931 | 7401 | __u16 res, stat; |
1da177e4 | 7402 | |
b1235d79 | 7403 | if (!status) { |
bdc25783 | 7404 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
7405 | res = L2CAP_CR_PEND; |
7406 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 7407 | chan->ops->defer(chan); |
df3c3931 | 7408 | } else { |
acdcabf5 | 7409 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
7410 | res = L2CAP_CR_SUCCESS; |
7411 | stat = L2CAP_CS_NO_INFO; | |
7412 | } | |
b1235d79 | 7413 | } else { |
acdcabf5 | 7414 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 7415 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
7416 | res = L2CAP_CR_SEC_BLOCK; |
7417 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
7418 | } |
7419 | ||
fe4128e0 GP |
7420 | rsp.scid = cpu_to_le16(chan->dcid); |
7421 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
7422 | rsp.result = cpu_to_le16(res); |
7423 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 7424 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 7425 | sizeof(rsp), &rsp); |
2d369359 MM |
7426 | |
7427 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
7428 | res == L2CAP_CR_SUCCESS) { | |
7429 | char buf[128]; | |
7430 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
7431 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
7432 | L2CAP_CONF_REQ, | |
7433 | l2cap_build_conf_req(chan, buf), | |
7434 | buf); | |
7435 | chan->num_conf_req++; | |
7436 | } | |
b1235d79 | 7437 | } |
1da177e4 | 7438 | |
6be36555 | 7439 | l2cap_chan_unlock(chan); |
1da177e4 LT |
7440 | } |
7441 | ||
3df91ea2 | 7442 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
7443 | } |
7444 | ||
686ebf28 | 7445 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
7446 | { |
7447 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
7448 | struct l2cap_hdr *hdr; |
7449 | int len; | |
1da177e4 | 7450 | |
1d13a254 AE |
7451 | /* For AMP controller do not create l2cap conn */ |
7452 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
7453 | goto drop; | |
1da177e4 | 7454 | |
5a08ecce | 7455 | if (!conn) |
baf43251 | 7456 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
7457 | |
7458 | if (!conn) | |
1da177e4 LT |
7459 | goto drop; |
7460 | ||
7461 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
7462 | ||
d73a0988 AE |
7463 | switch (flags) { |
7464 | case ACL_START: | |
7465 | case ACL_START_NO_FLUSH: | |
7466 | case ACL_COMPLETE: | |
1da177e4 LT |
7467 | if (conn->rx_len) { |
7468 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
7469 | kfree_skb(conn->rx_skb); | |
7470 | conn->rx_skb = NULL; | |
7471 | conn->rx_len = 0; | |
7472 | l2cap_conn_unreliable(conn, ECOMM); | |
7473 | } | |
7474 | ||
aae7fe22 AE |
7475 | /* Start fragment always begin with Basic L2CAP header */ |
7476 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
7477 | BT_ERR("Frame is too short (len %d)", skb->len); |
7478 | l2cap_conn_unreliable(conn, ECOMM); | |
7479 | goto drop; | |
7480 | } | |
7481 | ||
7482 | hdr = (struct l2cap_hdr *) skb->data; | |
7483 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
7484 | ||
7485 | if (len == skb->len) { | |
7486 | /* Complete frame received */ | |
7487 | l2cap_recv_frame(conn, skb); | |
7488 | return 0; | |
7489 | } | |
7490 | ||
7491 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
7492 | ||
7493 | if (skb->len > len) { | |
7494 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 7495 | skb->len, len); |
1da177e4 LT |
7496 | l2cap_conn_unreliable(conn, ECOMM); |
7497 | goto drop; | |
7498 | } | |
7499 | ||
7500 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 7501 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 7502 | if (!conn->rx_skb) |
1da177e4 LT |
7503 | goto drop; |
7504 | ||
d626f62b | 7505 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7506 | skb->len); |
1da177e4 | 7507 | conn->rx_len = len - skb->len; |
d73a0988 AE |
7508 | break; |
7509 | ||
7510 | case ACL_CONT: | |
1da177e4 LT |
7511 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
7512 | ||
7513 | if (!conn->rx_len) { | |
7514 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
7515 | l2cap_conn_unreliable(conn, ECOMM); | |
7516 | goto drop; | |
7517 | } | |
7518 | ||
7519 | if (skb->len > conn->rx_len) { | |
7520 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 7521 | skb->len, conn->rx_len); |
1da177e4 LT |
7522 | kfree_skb(conn->rx_skb); |
7523 | conn->rx_skb = NULL; | |
7524 | conn->rx_len = 0; | |
7525 | l2cap_conn_unreliable(conn, ECOMM); | |
7526 | goto drop; | |
7527 | } | |
7528 | ||
d626f62b | 7529 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7530 | skb->len); |
1da177e4 LT |
7531 | conn->rx_len -= skb->len; |
7532 | ||
7533 | if (!conn->rx_len) { | |
c4e5bafa JH |
7534 | /* Complete frame received. l2cap_recv_frame |
7535 | * takes ownership of the skb so set the global | |
7536 | * rx_skb pointer to NULL first. | |
7537 | */ | |
7538 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 7539 | conn->rx_skb = NULL; |
c4e5bafa | 7540 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 7541 | } |
d73a0988 | 7542 | break; |
1da177e4 LT |
7543 | } |
7544 | ||
7545 | drop: | |
7546 | kfree_skb(skb); | |
7547 | return 0; | |
7548 | } | |
7549 | ||
354fe804 JH |
7550 | static struct hci_cb l2cap_cb = { |
7551 | .name = "L2CAP", | |
539c496d | 7552 | .connect_cfm = l2cap_connect_cfm, |
3a6d576b | 7553 | .disconn_cfm = l2cap_disconn_cfm, |
354fe804 JH |
7554 | .security_cfm = l2cap_security_cfm, |
7555 | }; | |
7556 | ||
aef7d97c | 7557 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 7558 | { |
23691d75 | 7559 | struct l2cap_chan *c; |
1da177e4 | 7560 | |
333055f2 | 7561 | read_lock(&chan_list_lock); |
1da177e4 | 7562 | |
23691d75 | 7563 | list_for_each_entry(c, &chan_list, global_l) { |
eeb5a067 MH |
7564 | seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7565 | &c->src, c->src_type, &c->dst, c->dst_type, | |
fcb73338 AE |
7566 | c->state, __le16_to_cpu(c->psm), |
7567 | c->scid, c->dcid, c->imtu, c->omtu, | |
7568 | c->sec_level, c->mode); | |
61e1b4b7 | 7569 | } |
1da177e4 | 7570 | |
333055f2 | 7571 | read_unlock(&chan_list_lock); |
1da177e4 | 7572 | |
aef7d97c | 7573 | return 0; |
1da177e4 LT |
7574 | } |
7575 | ||
aef7d97c MH |
7576 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
7577 | { | |
7578 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
7579 | } | |
7580 | ||
7581 | static const struct file_operations l2cap_debugfs_fops = { | |
7582 | .open = l2cap_debugfs_open, | |
7583 | .read = seq_read, | |
7584 | .llseek = seq_lseek, | |
7585 | .release = single_release, | |
7586 | }; | |
7587 | ||
7588 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 7589 | |
64274518 | 7590 | int __init l2cap_init(void) |
1da177e4 LT |
7591 | { |
7592 | int err; | |
be9d1227 | 7593 | |
bb58f747 | 7594 | err = l2cap_init_sockets(); |
1da177e4 LT |
7595 | if (err < 0) |
7596 | return err; | |
7597 | ||
354fe804 JH |
7598 | hci_register_cb(&l2cap_cb); |
7599 | ||
1120e4bf MH |
7600 | if (IS_ERR_OR_NULL(bt_debugfs)) |
7601 | return 0; | |
7602 | ||
7603 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
7604 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 7605 | |
40b9397a | 7606 | debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs, |
f15b8ecf | 7607 | &le_max_credits); |
40b9397a | 7608 | debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs, |
f15b8ecf JH |
7609 | &le_default_mps); |
7610 | ||
1da177e4 | 7611 | return 0; |
1da177e4 LT |
7612 | } |
7613 | ||
64274518 | 7614 | void l2cap_exit(void) |
1da177e4 | 7615 | { |
aef7d97c | 7616 | debugfs_remove(l2cap_debugfs); |
354fe804 | 7617 | hci_unregister_cb(&l2cap_cb); |
bb58f747 | 7618 | l2cap_cleanup_sockets(); |
1da177e4 LT |
7619 | } |
7620 | ||
d1c4a17d GP |
7621 | module_param(disable_ertm, bool, 0644); |
7622 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |