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 | ||
ab0c127f | 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 | ||
835a6a2f | 1604 | if (!list_empty(&user->list)) { |
2c8e1411 DH |
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 | ||
835a6a2f | 1634 | if (list_empty(&user->list)) |
2c8e1411 DH |
1635 | goto out_unlock; |
1636 | ||
ab944c83 | 1637 | list_del_init(&user->list); |
2c8e1411 DH |
1638 | user->remove(conn, user); |
1639 | ||
1640 | out_unlock: | |
1641 | hci_dev_unlock(hdev); | |
1642 | } | |
1643 | EXPORT_SYMBOL(l2cap_unregister_user); | |
1644 | ||
1645 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) | |
1646 | { | |
1647 | struct l2cap_user *user; | |
1648 | ||
1649 | while (!list_empty(&conn->users)) { | |
1650 | user = list_first_entry(&conn->users, struct l2cap_user, list); | |
ab944c83 | 1651 | list_del_init(&user->list); |
2c8e1411 DH |
1652 | user->remove(conn, user); |
1653 | } | |
1654 | } | |
1655 | ||
5d3de7df VCG |
1656 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1657 | { | |
1658 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1659 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1660 | |
1661 | if (!conn) | |
1662 | return; | |
1663 | ||
1664 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1665 | ||
1666 | kfree_skb(conn->rx_skb); | |
1667 | ||
61a939c6 | 1668 | skb_queue_purge(&conn->pending_rx); |
7ab56c3a JT |
1669 | |
1670 | /* We can not call flush_work(&conn->pending_rx_work) here since we | |
1671 | * might block if we are running on a worker from the same workqueue | |
1672 | * pending_rx_work is waiting on. | |
1673 | */ | |
1674 | if (work_pending(&conn->pending_rx_work)) | |
1675 | cancel_work_sync(&conn->pending_rx_work); | |
61a939c6 | 1676 | |
f3d82d0c JH |
1677 | if (work_pending(&conn->id_addr_update_work)) |
1678 | cancel_work_sync(&conn->id_addr_update_work); | |
1679 | ||
2c8e1411 DH |
1680 | l2cap_unregister_all_users(conn); |
1681 | ||
e31fb860 JH |
1682 | /* Force the connection to be immediately dropped */ |
1683 | hcon->disc_timeout = 0; | |
1684 | ||
3df91ea2 AE |
1685 | mutex_lock(&conn->chan_lock); |
1686 | ||
5d3de7df VCG |
1687 | /* Kill channels */ |
1688 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1689 | l2cap_chan_hold(chan); |
6be36555 AE |
1690 | l2cap_chan_lock(chan); |
1691 | ||
5d3de7df | 1692 | l2cap_chan_del(chan, err); |
6be36555 AE |
1693 | |
1694 | l2cap_chan_unlock(chan); | |
1695 | ||
80b98027 | 1696 | chan->ops->close(chan); |
61d6ef3e | 1697 | l2cap_chan_put(chan); |
5d3de7df VCG |
1698 | } |
1699 | ||
3df91ea2 AE |
1700 | mutex_unlock(&conn->chan_lock); |
1701 | ||
73d80deb LAD |
1702 | hci_chan_del(conn->hchan); |
1703 | ||
5d3de7df | 1704 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1705 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1706 | |
5d3de7df | 1707 | hcon->l2cap_data = NULL; |
9c903e37 DH |
1708 | conn->hchan = NULL; |
1709 | l2cap_conn_put(conn); | |
5d3de7df VCG |
1710 | } |
1711 | ||
9c903e37 DH |
1712 | static void l2cap_conn_free(struct kref *ref) |
1713 | { | |
1714 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); | |
1715 | ||
1716 | hci_conn_put(conn->hcon); | |
1717 | kfree(conn); | |
1718 | } | |
1719 | ||
51bb8457 | 1720 | struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn) |
9c903e37 DH |
1721 | { |
1722 | kref_get(&conn->ref); | |
51bb8457 | 1723 | return conn; |
9c903e37 DH |
1724 | } |
1725 | EXPORT_SYMBOL(l2cap_conn_get); | |
1726 | ||
1727 | void l2cap_conn_put(struct l2cap_conn *conn) | |
1728 | { | |
1729 | kref_put(&conn->ref, l2cap_conn_free); | |
1730 | } | |
1731 | EXPORT_SYMBOL(l2cap_conn_put); | |
1732 | ||
1da177e4 | 1733 | /* ---- Socket interface ---- */ |
1da177e4 | 1734 | |
c2287681 | 1735 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1736 | * Returns closest match. |
1737 | */ | |
c2287681 IY |
1738 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1739 | bdaddr_t *src, | |
bf20fd4e JH |
1740 | bdaddr_t *dst, |
1741 | u8 link_type) | |
1da177e4 | 1742 | { |
23691d75 | 1743 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1744 | |
23691d75 | 1745 | read_lock(&chan_list_lock); |
e0f0cb56 | 1746 | |
23691d75 | 1747 | list_for_each_entry(c, &chan_list, global_l) { |
89bc500e | 1748 | if (state && c->state != state) |
1da177e4 LT |
1749 | continue; |
1750 | ||
bf20fd4e JH |
1751 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1752 | continue; | |
1753 | ||
1754 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) | |
1755 | continue; | |
1756 | ||
23691d75 | 1757 | if (c->psm == psm) { |
c2287681 IY |
1758 | int src_match, dst_match; |
1759 | int src_any, dst_any; | |
1760 | ||
1da177e4 | 1761 | /* Exact match. */ |
7eafc59e MH |
1762 | src_match = !bacmp(&c->src, src); |
1763 | dst_match = !bacmp(&c->dst, dst); | |
c2287681 | 1764 | if (src_match && dst_match) { |
a24cce14 | 1765 | l2cap_chan_hold(c); |
a7567b20 | 1766 | read_unlock(&chan_list_lock); |
23691d75 GP |
1767 | return c; |
1768 | } | |
1da177e4 LT |
1769 | |
1770 | /* Closest match */ | |
7eafc59e MH |
1771 | src_any = !bacmp(&c->src, BDADDR_ANY); |
1772 | dst_any = !bacmp(&c->dst, BDADDR_ANY); | |
c2287681 IY |
1773 | if ((src_match && dst_any) || (src_any && dst_match) || |
1774 | (src_any && dst_any)) | |
23691d75 | 1775 | c1 = c; |
1da177e4 LT |
1776 | } |
1777 | } | |
1da177e4 | 1778 | |
a24cce14 JH |
1779 | if (c1) |
1780 | l2cap_chan_hold(c1); | |
1781 | ||
23691d75 | 1782 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1783 | |
23691d75 | 1784 | return c1; |
1da177e4 LT |
1785 | } |
1786 | ||
721c4181 | 1787 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1788 | { |
721c4181 | 1789 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1790 | monitor_timer.work); |
e90bac06 | 1791 | |
525cd185 | 1792 | BT_DBG("chan %p", chan); |
0e98958d | 1793 | |
6be36555 AE |
1794 | l2cap_chan_lock(chan); |
1795 | ||
80909e04 | 1796 | if (!chan->conn) { |
6be36555 | 1797 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1798 | l2cap_chan_put(chan); |
e90bac06 GP |
1799 | return; |
1800 | } | |
1801 | ||
401bb1f7 | 1802 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO); |
e90bac06 | 1803 | |
6be36555 | 1804 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1805 | l2cap_chan_put(chan); |
e90bac06 GP |
1806 | } |
1807 | ||
721c4181 | 1808 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1809 | { |
721c4181 | 1810 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
4239d16f | 1811 | retrans_timer.work); |
e90bac06 | 1812 | |
49208c9c | 1813 | BT_DBG("chan %p", chan); |
0e98958d | 1814 | |
6be36555 AE |
1815 | l2cap_chan_lock(chan); |
1816 | ||
80909e04 MM |
1817 | if (!chan->conn) { |
1818 | l2cap_chan_unlock(chan); | |
1819 | l2cap_chan_put(chan); | |
1820 | return; | |
1821 | } | |
6be36555 | 1822 | |
401bb1f7 | 1823 | l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO); |
6be36555 | 1824 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1825 | l2cap_chan_put(chan); |
e90bac06 GP |
1826 | } |
1827 | ||
d660366d GP |
1828 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
1829 | struct sk_buff_head *skbs) | |
6840ed07 | 1830 | { |
ccbb84af | 1831 | struct sk_buff *skb; |
3733937d | 1832 | struct l2cap_ctrl *control; |
6840ed07 | 1833 | |
3733937d MM |
1834 | BT_DBG("chan %p, skbs %p", chan, skbs); |
1835 | ||
b99e13ad MM |
1836 | if (__chan_is_moving(chan)) |
1837 | return; | |
1838 | ||
3733937d MM |
1839 | skb_queue_splice_tail_init(skbs, &chan->tx_q); |
1840 | ||
1841 | while (!skb_queue_empty(&chan->tx_q)) { | |
1842 | ||
1843 | skb = skb_dequeue(&chan->tx_q); | |
1844 | ||
a4368ff3 JH |
1845 | bt_cb(skb)->l2cap.retries = 1; |
1846 | control = &bt_cb(skb)->l2cap; | |
3733937d MM |
1847 | |
1848 | control->reqseq = 0; | |
1849 | control->txseq = chan->next_tx_seq; | |
1850 | ||
1851 | __pack_control(chan, control, skb); | |
6840ed07 | 1852 | |
47d1ec61 | 1853 | if (chan->fcs == L2CAP_FCS_CRC16) { |
3733937d MM |
1854 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1855 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1856 | } |
1857 | ||
4343478f | 1858 | l2cap_do_send(chan, skb); |
6840ed07 | 1859 | |
b4400672 | 1860 | BT_DBG("Sent txseq %u", control->txseq); |
3733937d | 1861 | |
836be934 | 1862 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
3733937d | 1863 | chan->frames_sent++; |
6840ed07 | 1864 | } |
6840ed07 GP |
1865 | } |
1866 | ||
67c9e840 | 1867 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1868 | { |
1869 | struct sk_buff *skb, *tx_skb; | |
18a48e76 MM |
1870 | struct l2cap_ctrl *control; |
1871 | int sent = 0; | |
1872 | ||
1873 | BT_DBG("chan %p", chan); | |
1c2acffb | 1874 | |
89bc500e | 1875 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1876 | return -ENOTCONN; |
e90bac06 | 1877 | |
94122bbe MM |
1878 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1879 | return 0; | |
1880 | ||
b99e13ad MM |
1881 | if (__chan_is_moving(chan)) |
1882 | return 0; | |
1883 | ||
18a48e76 MM |
1884 | while (chan->tx_send_head && |
1885 | chan->unacked_frames < chan->remote_tx_win && | |
1886 | chan->tx_state == L2CAP_TX_STATE_XMIT) { | |
e420aba3 | 1887 | |
18a48e76 | 1888 | skb = chan->tx_send_head; |
e90bac06 | 1889 | |
a4368ff3 JH |
1890 | bt_cb(skb)->l2cap.retries = 1; |
1891 | control = &bt_cb(skb)->l2cap; | |
95ffa978 | 1892 | |
e2ab4353 | 1893 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
18a48e76 | 1894 | control->final = 1; |
e2ab4353 | 1895 | |
18a48e76 MM |
1896 | control->reqseq = chan->buffer_seq; |
1897 | chan->last_acked_seq = chan->buffer_seq; | |
1898 | control->txseq = chan->next_tx_seq; | |
1c2acffb | 1899 | |
18a48e76 | 1900 | __pack_control(chan, control, skb); |
e90bac06 | 1901 | |
47d1ec61 | 1902 | if (chan->fcs == L2CAP_FCS_CRC16) { |
18a48e76 MM |
1903 | u16 fcs = crc16(0, (u8 *) skb->data, skb->len); |
1904 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
fcc203c3 GP |
1905 | } |
1906 | ||
18a48e76 MM |
1907 | /* Clone after data has been modified. Data is assumed to be |
1908 | read-only (for locking purposes) on cloned sk_buffs. | |
1909 | */ | |
1910 | tx_skb = skb_clone(skb, GFP_KERNEL); | |
9a9c6a34 | 1911 | |
18a48e76 MM |
1912 | if (!tx_skb) |
1913 | break; | |
1c2acffb | 1914 | |
18a48e76 | 1915 | __set_retrans_timer(chan); |
836be934 AE |
1916 | |
1917 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
18a48e76 | 1918 | chan->unacked_frames++; |
6a026610 | 1919 | chan->frames_sent++; |
18a48e76 | 1920 | sent++; |
1c2acffb | 1921 | |
58d35f87 GP |
1922 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1923 | chan->tx_send_head = NULL; | |
1c2acffb | 1924 | else |
58d35f87 | 1925 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
18a48e76 MM |
1926 | |
1927 | l2cap_do_send(chan, tx_skb); | |
b4400672 | 1928 | BT_DBG("Sent txseq %u", control->txseq); |
1c2acffb GP |
1929 | } |
1930 | ||
b4400672 AE |
1931 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent, |
1932 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); | |
18a48e76 MM |
1933 | |
1934 | return sent; | |
9e917af1 GP |
1935 | } |
1936 | ||
e1fbd4c1 MM |
1937 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
1938 | { | |
1939 | struct l2cap_ctrl control; | |
1940 | struct sk_buff *skb; | |
1941 | struct sk_buff *tx_skb; | |
1942 | u16 seq; | |
1943 | ||
1944 | BT_DBG("chan %p", chan); | |
1945 | ||
1946 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
1947 | return; | |
1948 | ||
b99e13ad MM |
1949 | if (__chan_is_moving(chan)) |
1950 | return; | |
1951 | ||
e1fbd4c1 MM |
1952 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
1953 | seq = l2cap_seq_list_pop(&chan->retrans_list); | |
1954 | ||
1955 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq); | |
1956 | if (!skb) { | |
1957 | BT_DBG("Error: Can't retransmit seq %d, frame missing", | |
2d792818 | 1958 | seq); |
e1fbd4c1 MM |
1959 | continue; |
1960 | } | |
1961 | ||
a4368ff3 JH |
1962 | bt_cb(skb)->l2cap.retries++; |
1963 | control = bt_cb(skb)->l2cap; | |
e1fbd4c1 MM |
1964 | |
1965 | if (chan->max_tx != 0 && | |
a4368ff3 | 1966 | bt_cb(skb)->l2cap.retries > chan->max_tx) { |
e1fbd4c1 | 1967 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
5e4e3972 | 1968 | l2cap_send_disconn_req(chan, ECONNRESET); |
e1fbd4c1 MM |
1969 | l2cap_seq_list_clear(&chan->retrans_list); |
1970 | break; | |
1971 | } | |
1972 | ||
1973 | control.reqseq = chan->buffer_seq; | |
1974 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
1975 | control.final = 1; | |
1976 | else | |
1977 | control.final = 0; | |
1978 | ||
1979 | if (skb_cloned(skb)) { | |
1980 | /* Cloned sk_buffs are read-only, so we need a | |
1981 | * writeable copy | |
1982 | */ | |
8bcde1f2 | 1983 | tx_skb = skb_copy(skb, GFP_KERNEL); |
e1fbd4c1 | 1984 | } else { |
8bcde1f2 | 1985 | tx_skb = skb_clone(skb, GFP_KERNEL); |
e1fbd4c1 MM |
1986 | } |
1987 | ||
1988 | if (!tx_skb) { | |
1989 | l2cap_seq_list_clear(&chan->retrans_list); | |
1990 | break; | |
1991 | } | |
1992 | ||
1993 | /* Update skb contents */ | |
1994 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
1995 | put_unaligned_le32(__pack_extended_control(&control), | |
1996 | tx_skb->data + L2CAP_HDR_SIZE); | |
1997 | } else { | |
1998 | put_unaligned_le16(__pack_enhanced_control(&control), | |
1999 | tx_skb->data + L2CAP_HDR_SIZE); | |
2000 | } | |
2001 | ||
13cac152 | 2002 | /* Update FCS */ |
e1fbd4c1 | 2003 | if (chan->fcs == L2CAP_FCS_CRC16) { |
13cac152 LR |
2004 | u16 fcs = crc16(0, (u8 *) tx_skb->data, |
2005 | tx_skb->len - L2CAP_FCS_SIZE); | |
2006 | put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) - | |
2007 | L2CAP_FCS_SIZE); | |
e1fbd4c1 MM |
2008 | } |
2009 | ||
2010 | l2cap_do_send(chan, tx_skb); | |
2011 | ||
2012 | BT_DBG("Resent txseq %d", control.txseq); | |
2013 | ||
2014 | chan->last_acked_seq = chan->buffer_seq; | |
2015 | } | |
2016 | } | |
2017 | ||
f80842a8 MM |
2018 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2019 | struct l2cap_ctrl *control) | |
2020 | { | |
2021 | BT_DBG("chan %p, control %p", chan, control); | |
2022 | ||
2023 | l2cap_seq_list_append(&chan->retrans_list, control->reqseq); | |
2024 | l2cap_ertm_resend(chan); | |
2025 | } | |
2026 | ||
d2a7ac5d MM |
2027 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2028 | struct l2cap_ctrl *control) | |
2029 | { | |
e1fbd4c1 MM |
2030 | struct sk_buff *skb; |
2031 | ||
2032 | BT_DBG("chan %p, control %p", chan, control); | |
2033 | ||
2034 | if (control->poll) | |
2035 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
2036 | ||
2037 | l2cap_seq_list_clear(&chan->retrans_list); | |
2038 | ||
2039 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) | |
2040 | return; | |
2041 | ||
2042 | if (chan->unacked_frames) { | |
2043 | skb_queue_walk(&chan->tx_q, skb) { | |
a4368ff3 | 2044 | if (bt_cb(skb)->l2cap.txseq == control->reqseq || |
2d792818 | 2045 | skb == chan->tx_send_head) |
e1fbd4c1 MM |
2046 | break; |
2047 | } | |
2048 | ||
2049 | skb_queue_walk_from(&chan->tx_q, skb) { | |
2050 | if (skb == chan->tx_send_head) | |
2051 | break; | |
2052 | ||
2053 | l2cap_seq_list_append(&chan->retrans_list, | |
a4368ff3 | 2054 | bt_cb(skb)->l2cap.txseq); |
e1fbd4c1 MM |
2055 | } |
2056 | ||
2057 | l2cap_ertm_resend(chan); | |
2058 | } | |
d2a7ac5d MM |
2059 | } |
2060 | ||
0a0aba42 | 2061 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 2062 | { |
0a0aba42 MM |
2063 | struct l2cap_ctrl control; |
2064 | u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq, | |
2065 | chan->last_acked_seq); | |
2066 | int threshold; | |
9e917af1 | 2067 | |
0a0aba42 MM |
2068 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d", |
2069 | chan, chan->last_acked_seq, chan->buffer_seq); | |
9e917af1 | 2070 | |
0a0aba42 MM |
2071 | memset(&control, 0, sizeof(control)); |
2072 | control.sframe = 1; | |
dfc909be | 2073 | |
0a0aba42 MM |
2074 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2075 | chan->rx_state == L2CAP_RX_STATE_RECV) { | |
2076 | __clear_ack_timer(chan); | |
2077 | control.super = L2CAP_SUPER_RNR; | |
2078 | control.reqseq = chan->buffer_seq; | |
2079 | l2cap_send_sframe(chan, &control); | |
2080 | } else { | |
2081 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { | |
2082 | l2cap_ertm_send(chan); | |
2083 | /* If any i-frames were sent, they included an ack */ | |
2084 | if (chan->buffer_seq == chan->last_acked_seq) | |
2085 | frames_to_ack = 0; | |
2086 | } | |
dfc909be | 2087 | |
c20f8e35 | 2088 | /* Ack now if the window is 3/4ths full. |
0a0aba42 MM |
2089 | * Calculate without mul or div |
2090 | */ | |
c20f8e35 | 2091 | threshold = chan->ack_win; |
0a0aba42 MM |
2092 | threshold += threshold << 1; |
2093 | threshold >>= 2; | |
2094 | ||
b4400672 | 2095 | BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack, |
0a0aba42 MM |
2096 | threshold); |
2097 | ||
2098 | if (frames_to_ack >= threshold) { | |
2099 | __clear_ack_timer(chan); | |
2100 | control.super = L2CAP_SUPER_RR; | |
2101 | control.reqseq = chan->buffer_seq; | |
2102 | l2cap_send_sframe(chan, &control); | |
2103 | frames_to_ack = 0; | |
2104 | } | |
1c2acffb | 2105 | |
0a0aba42 MM |
2106 | if (frames_to_ack) |
2107 | __set_ack_timer(chan); | |
2108 | } | |
b17e73bb SJ |
2109 | } |
2110 | ||
04124681 GP |
2111 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2112 | struct msghdr *msg, int len, | |
2113 | int count, struct sk_buff *skb) | |
1c2acffb | 2114 | { |
0952a57a | 2115 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2116 | struct sk_buff **frag; |
90338947 | 2117 | int sent = 0; |
1da177e4 | 2118 | |
17836394 | 2119 | if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count) |
1c2acffb | 2120 | return -EFAULT; |
1da177e4 LT |
2121 | |
2122 | sent += count; | |
2123 | len -= count; | |
2124 | ||
2125 | /* Continuation fragments (no L2CAP header) */ | |
2126 | frag = &skb_shinfo(skb)->frag_list; | |
2127 | while (len) { | |
fbe00700 GP |
2128 | struct sk_buff *tmp; |
2129 | ||
1da177e4 LT |
2130 | count = min_t(unsigned int, conn->mtu, len); |
2131 | ||
d9fbd02b | 2132 | tmp = chan->ops->alloc_skb(chan, 0, count, |
fbe00700 GP |
2133 | msg->msg_flags & MSG_DONTWAIT); |
2134 | if (IS_ERR(tmp)) | |
2135 | return PTR_ERR(tmp); | |
2136 | ||
2137 | *frag = tmp; | |
2f7719ce | 2138 | |
17836394 AV |
2139 | if (copy_from_iter(skb_put(*frag, count), count, |
2140 | &msg->msg_iter) != count) | |
1c2acffb | 2141 | return -EFAULT; |
1da177e4 LT |
2142 | |
2143 | sent += count; | |
2144 | len -= count; | |
2145 | ||
2d0ed3d5 GP |
2146 | skb->len += (*frag)->len; |
2147 | skb->data_len += (*frag)->len; | |
2148 | ||
1da177e4 LT |
2149 | frag = &(*frag)->next; |
2150 | } | |
1da177e4 LT |
2151 | |
2152 | return sent; | |
1c2acffb | 2153 | } |
1da177e4 | 2154 | |
5e59b791 | 2155 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
8d46321c | 2156 | struct msghdr *msg, size_t len) |
1c2acffb | 2157 | { |
8c1d787b | 2158 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2159 | struct sk_buff *skb; |
03a51213 | 2160 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
2161 | struct l2cap_hdr *lh; |
2162 | ||
8d46321c MH |
2163 | BT_DBG("chan %p psm 0x%2.2x len %zu", chan, |
2164 | __le16_to_cpu(chan->psm), len); | |
1c2acffb GP |
2165 | |
2166 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce | 2167 | |
d9fbd02b | 2168 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2169 | msg->msg_flags & MSG_DONTWAIT); |
2170 | if (IS_ERR(skb)) | |
2171 | return skb; | |
1c2acffb GP |
2172 | |
2173 | /* Create L2CAP header */ | |
2174 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2175 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c | 2176 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
43b1b8df | 2177 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
1c2acffb | 2178 | |
0952a57a | 2179 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2180 | if (unlikely(err < 0)) { |
2181 | kfree_skb(skb); | |
2182 | return ERR_PTR(err); | |
2183 | } | |
2184 | return skb; | |
2185 | } | |
2186 | ||
5e59b791 | 2187 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
8d46321c | 2188 | struct msghdr *msg, size_t len) |
1c2acffb | 2189 | { |
8c1d787b | 2190 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2191 | struct sk_buff *skb; |
f2ba7fae | 2192 | int err, count; |
1c2acffb GP |
2193 | struct l2cap_hdr *lh; |
2194 | ||
b4400672 | 2195 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2196 | |
f2ba7fae | 2197 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 2198 | |
d9fbd02b | 2199 | skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, |
90338947 GP |
2200 | msg->msg_flags & MSG_DONTWAIT); |
2201 | if (IS_ERR(skb)) | |
2202 | return skb; | |
1c2acffb GP |
2203 | |
2204 | /* Create L2CAP header */ | |
2205 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2206 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 2207 | lh->len = cpu_to_le16(len); |
1c2acffb | 2208 | |
0952a57a | 2209 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2210 | if (unlikely(err < 0)) { |
2211 | kfree_skb(skb); | |
2212 | return ERR_PTR(err); | |
2213 | } | |
2214 | return skb; | |
2215 | } | |
2216 | ||
ab0ff76d | 2217 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
b4400672 AE |
2218 | struct msghdr *msg, size_t len, |
2219 | u16 sdulen) | |
1c2acffb | 2220 | { |
8c1d787b | 2221 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 2222 | struct sk_buff *skb; |
e4ca6d98 | 2223 | int err, count, hlen; |
1c2acffb GP |
2224 | struct l2cap_hdr *lh; |
2225 | ||
b4400672 | 2226 | BT_DBG("chan %p len %zu", chan, len); |
1c2acffb | 2227 | |
0ee0d208 GP |
2228 | if (!conn) |
2229 | return ERR_PTR(-ENOTCONN); | |
2230 | ||
ba7aa64f | 2231 | hlen = __ertm_hdr_size(chan); |
e4ca6d98 | 2232 | |
c74e560c | 2233 | if (sdulen) |
03a51213 | 2234 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 2235 | |
47d1ec61 | 2236 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 2237 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 2238 | |
1c2acffb | 2239 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce | 2240 | |
d9fbd02b | 2241 | skb = chan->ops->alloc_skb(chan, hlen, count, |
90338947 GP |
2242 | msg->msg_flags & MSG_DONTWAIT); |
2243 | if (IS_ERR(skb)) | |
2244 | return skb; | |
1c2acffb GP |
2245 | |
2246 | /* Create L2CAP header */ | |
2247 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 2248 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 2249 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 2250 | |
18a48e76 MM |
2251 | /* Control header is populated later */ |
2252 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2253 | put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE)); | |
2254 | else | |
2255 | put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE)); | |
88843ab0 | 2256 | |
c74e560c | 2257 | if (sdulen) |
03a51213 | 2258 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 2259 | |
0952a57a | 2260 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
2261 | if (unlikely(err < 0)) { |
2262 | kfree_skb(skb); | |
2263 | return ERR_PTR(err); | |
2264 | } | |
e90bac06 | 2265 | |
a4368ff3 JH |
2266 | bt_cb(skb)->l2cap.fcs = chan->fcs; |
2267 | bt_cb(skb)->l2cap.retries = 0; | |
1c2acffb | 2268 | return skb; |
1da177e4 LT |
2269 | } |
2270 | ||
94122bbe MM |
2271 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2272 | struct sk_buff_head *seg_queue, | |
2273 | struct msghdr *msg, size_t len) | |
c74e560c | 2274 | { |
c74e560c | 2275 | struct sk_buff *skb; |
94122bbe MM |
2276 | u16 sdu_len; |
2277 | size_t pdu_len; | |
94122bbe | 2278 | u8 sar; |
c74e560c | 2279 | |
b4400672 | 2280 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); |
c74e560c | 2281 | |
94122bbe MM |
2282 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2283 | * so fragmented skbs are not used. The HCI layer's handling | |
2284 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2285 | */ | |
c74e560c | 2286 | |
94122bbe MM |
2287 | /* PDU size is derived from the HCI MTU */ |
2288 | pdu_len = chan->conn->mtu; | |
c74e560c | 2289 | |
a549574d MM |
2290 | /* Constrain PDU size for BR/EDR connections */ |
2291 | if (!chan->hs_hcon) | |
2292 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); | |
94122bbe MM |
2293 | |
2294 | /* Adjust for largest possible L2CAP overhead. */ | |
35d401df GP |
2295 | if (chan->fcs) |
2296 | pdu_len -= L2CAP_FCS_SIZE; | |
2297 | ||
ba7aa64f | 2298 | pdu_len -= __ertm_hdr_size(chan); |
94122bbe MM |
2299 | |
2300 | /* Remote device may have requested smaller PDUs */ | |
2301 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2302 | ||
2303 | if (len <= pdu_len) { | |
2304 | sar = L2CAP_SAR_UNSEGMENTED; | |
2305 | sdu_len = 0; | |
2306 | pdu_len = len; | |
2307 | } else { | |
2308 | sar = L2CAP_SAR_START; | |
2309 | sdu_len = len; | |
94122bbe MM |
2310 | } |
2311 | ||
2312 | while (len > 0) { | |
2313 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2314 | |
c74e560c | 2315 | if (IS_ERR(skb)) { |
94122bbe | 2316 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2317 | return PTR_ERR(skb); |
2318 | } | |
2319 | ||
a4368ff3 | 2320 | bt_cb(skb)->l2cap.sar = sar; |
94122bbe MM |
2321 | __skb_queue_tail(seg_queue, skb); |
2322 | ||
2323 | len -= pdu_len; | |
069cb270 | 2324 | if (sdu_len) |
94122bbe | 2325 | sdu_len = 0; |
94122bbe MM |
2326 | |
2327 | if (len <= pdu_len) { | |
2328 | sar = L2CAP_SAR_END; | |
2329 | pdu_len = len; | |
2330 | } else { | |
2331 | sar = L2CAP_SAR_CONTINUE; | |
2332 | } | |
c74e560c | 2333 | } |
c74e560c | 2334 | |
f0f62799 | 2335 | return 0; |
c74e560c GP |
2336 | } |
2337 | ||
177f8f2b JH |
2338 | static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, |
2339 | struct msghdr *msg, | |
2340 | size_t len, u16 sdulen) | |
2341 | { | |
2342 | struct l2cap_conn *conn = chan->conn; | |
2343 | struct sk_buff *skb; | |
2344 | int err, count, hlen; | |
2345 | struct l2cap_hdr *lh; | |
2346 | ||
2347 | BT_DBG("chan %p len %zu", chan, len); | |
2348 | ||
2349 | if (!conn) | |
2350 | return ERR_PTR(-ENOTCONN); | |
2351 | ||
2352 | hlen = L2CAP_HDR_SIZE; | |
2353 | ||
2354 | if (sdulen) | |
2355 | hlen += L2CAP_SDULEN_SIZE; | |
2356 | ||
2357 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2358 | ||
d9fbd02b | 2359 | skb = chan->ops->alloc_skb(chan, hlen, count, |
177f8f2b JH |
2360 | msg->msg_flags & MSG_DONTWAIT); |
2361 | if (IS_ERR(skb)) | |
2362 | return skb; | |
2363 | ||
2364 | /* Create L2CAP header */ | |
2365 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
2366 | lh->cid = cpu_to_le16(chan->dcid); | |
2367 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
2368 | ||
2369 | if (sdulen) | |
2370 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); | |
2371 | ||
2372 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); | |
2373 | if (unlikely(err < 0)) { | |
2374 | kfree_skb(skb); | |
2375 | return ERR_PTR(err); | |
2376 | } | |
2377 | ||
2378 | return skb; | |
2379 | } | |
2380 | ||
2381 | static int l2cap_segment_le_sdu(struct l2cap_chan *chan, | |
2382 | struct sk_buff_head *seg_queue, | |
2383 | struct msghdr *msg, size_t len) | |
2384 | { | |
2385 | struct sk_buff *skb; | |
2386 | size_t pdu_len; | |
2387 | u16 sdu_len; | |
2388 | ||
2389 | BT_DBG("chan %p, msg %p, len %zu", chan, msg, len); | |
2390 | ||
177f8f2b | 2391 | sdu_len = len; |
72c6fb91 | 2392 | pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE; |
177f8f2b JH |
2393 | |
2394 | while (len > 0) { | |
2395 | if (len <= pdu_len) | |
2396 | pdu_len = len; | |
2397 | ||
2398 | skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len); | |
2399 | if (IS_ERR(skb)) { | |
2400 | __skb_queue_purge(seg_queue); | |
2401 | return PTR_ERR(skb); | |
2402 | } | |
2403 | ||
2404 | __skb_queue_tail(seg_queue, skb); | |
2405 | ||
2406 | len -= pdu_len; | |
2407 | ||
2408 | if (sdu_len) { | |
2409 | sdu_len = 0; | |
2410 | pdu_len += L2CAP_SDULEN_SIZE; | |
2411 | } | |
2412 | } | |
2413 | ||
2414 | return 0; | |
2415 | } | |
2416 | ||
8d46321c | 2417 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
9a91a04a | 2418 | { |
9a91a04a | 2419 | struct sk_buff *skb; |
9a91a04a | 2420 | int err; |
94122bbe | 2421 | struct sk_buff_head seg_queue; |
9a91a04a | 2422 | |
31e8ce80 SWK |
2423 | if (!chan->conn) |
2424 | return -ENOTCONN; | |
2425 | ||
9a91a04a | 2426 | /* Connectionless channel */ |
715ec005 | 2427 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
8d46321c | 2428 | skb = l2cap_create_connless_pdu(chan, msg, len); |
9a91a04a GP |
2429 | if (IS_ERR(skb)) |
2430 | return PTR_ERR(skb); | |
2431 | ||
ede81a2a AK |
2432 | /* Channel lock is released before requesting new skb and then |
2433 | * reacquired thus we need to recheck channel state. | |
2434 | */ | |
2435 | if (chan->state != BT_CONNECTED) { | |
2436 | kfree_skb(skb); | |
2437 | return -ENOTCONN; | |
2438 | } | |
2439 | ||
9a91a04a GP |
2440 | l2cap_do_send(chan, skb); |
2441 | return len; | |
2442 | } | |
2443 | ||
2444 | switch (chan->mode) { | |
38319713 | 2445 | case L2CAP_MODE_LE_FLOWCTL: |
177f8f2b JH |
2446 | /* Check outgoing MTU */ |
2447 | if (len > chan->omtu) | |
2448 | return -EMSGSIZE; | |
2449 | ||
fad5fc89 JH |
2450 | if (!chan->tx_credits) |
2451 | return -EAGAIN; | |
2452 | ||
177f8f2b JH |
2453 | __skb_queue_head_init(&seg_queue); |
2454 | ||
2455 | err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len); | |
2456 | ||
2457 | if (chan->state != BT_CONNECTED) { | |
2458 | __skb_queue_purge(&seg_queue); | |
2459 | err = -ENOTCONN; | |
2460 | } | |
2461 | ||
2462 | if (err) | |
2463 | return err; | |
2464 | ||
2465 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); | |
2466 | ||
2467 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
2468 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
2469 | chan->tx_credits--; | |
2470 | } | |
2471 | ||
2472 | if (!chan->tx_credits) | |
2473 | chan->ops->suspend(chan); | |
2474 | ||
2475 | err = len; | |
2476 | ||
2477 | break; | |
2478 | ||
fad5fc89 | 2479 | case L2CAP_MODE_BASIC: |
9a91a04a GP |
2480 | /* Check outgoing MTU */ |
2481 | if (len > chan->omtu) | |
2482 | return -EMSGSIZE; | |
2483 | ||
2484 | /* Create a basic PDU */ | |
8d46321c | 2485 | skb = l2cap_create_basic_pdu(chan, msg, len); |
9a91a04a GP |
2486 | if (IS_ERR(skb)) |
2487 | return PTR_ERR(skb); | |
2488 | ||
ede81a2a AK |
2489 | /* Channel lock is released before requesting new skb and then |
2490 | * reacquired thus we need to recheck channel state. | |
2491 | */ | |
2492 | if (chan->state != BT_CONNECTED) { | |
2493 | kfree_skb(skb); | |
2494 | return -ENOTCONN; | |
2495 | } | |
2496 | ||
9a91a04a GP |
2497 | l2cap_do_send(chan, skb); |
2498 | err = len; | |
2499 | break; | |
2500 | ||
2501 | case L2CAP_MODE_ERTM: | |
2502 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2503 | /* Check outgoing MTU */ |
2504 | if (len > chan->omtu) { | |
2505 | err = -EMSGSIZE; | |
2506 | break; | |
2507 | } | |
9a91a04a | 2508 | |
94122bbe | 2509 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2510 | |
94122bbe MM |
2511 | /* Do segmentation before calling in to the state machine, |
2512 | * since it's possible to block while waiting for memory | |
2513 | * allocation. | |
2514 | */ | |
2515 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2516 | |
94122bbe MM |
2517 | /* The channel could have been closed while segmenting, |
2518 | * check that it is still connected. | |
2519 | */ | |
2520 | if (chan->state != BT_CONNECTED) { | |
2521 | __skb_queue_purge(&seg_queue); | |
2522 | err = -ENOTCONN; | |
9a91a04a GP |
2523 | } |
2524 | ||
94122bbe | 2525 | if (err) |
9a91a04a | 2526 | break; |
9a91a04a | 2527 | |
3733937d | 2528 | if (chan->mode == L2CAP_MODE_ERTM) |
d660366d | 2529 | l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST); |
3733937d | 2530 | else |
d660366d | 2531 | l2cap_streaming_send(chan, &seg_queue); |
9a91a04a | 2532 | |
d660366d | 2533 | err = len; |
9a91a04a | 2534 | |
94122bbe MM |
2535 | /* If the skbs were not queued for sending, they'll still be in |
2536 | * seg_queue and need to be purged. | |
2537 | */ | |
2538 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2539 | break; |
2540 | ||
2541 | default: | |
2542 | BT_DBG("bad state %1.1x", chan->mode); | |
2543 | err = -EBADFD; | |
2544 | } | |
2545 | ||
2546 | return err; | |
2547 | } | |
6b8d4a6a | 2548 | EXPORT_SYMBOL_GPL(l2cap_chan_send); |
9a91a04a | 2549 | |
d2a7ac5d MM |
2550 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2551 | { | |
bed68bde MM |
2552 | struct l2cap_ctrl control; |
2553 | u16 seq; | |
2554 | ||
b4400672 | 2555 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2556 | |
2557 | memset(&control, 0, sizeof(control)); | |
2558 | control.sframe = 1; | |
2559 | control.super = L2CAP_SUPER_SREJ; | |
2560 | ||
2561 | for (seq = chan->expected_tx_seq; seq != txseq; | |
2562 | seq = __next_seq(chan, seq)) { | |
2563 | if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) { | |
2564 | control.reqseq = seq; | |
2565 | l2cap_send_sframe(chan, &control); | |
2566 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2567 | } | |
2568 | } | |
2569 | ||
2570 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
d2a7ac5d MM |
2571 | } |
2572 | ||
2573 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) | |
2574 | { | |
bed68bde MM |
2575 | struct l2cap_ctrl control; |
2576 | ||
2577 | BT_DBG("chan %p", chan); | |
2578 | ||
2579 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) | |
2580 | return; | |
2581 | ||
2582 | memset(&control, 0, sizeof(control)); | |
2583 | control.sframe = 1; | |
2584 | control.super = L2CAP_SUPER_SREJ; | |
2585 | control.reqseq = chan->srej_list.tail; | |
2586 | l2cap_send_sframe(chan, &control); | |
d2a7ac5d MM |
2587 | } |
2588 | ||
2589 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) | |
2590 | { | |
bed68bde MM |
2591 | struct l2cap_ctrl control; |
2592 | u16 initial_head; | |
2593 | u16 seq; | |
2594 | ||
b4400672 | 2595 | BT_DBG("chan %p, txseq %u", chan, txseq); |
bed68bde MM |
2596 | |
2597 | memset(&control, 0, sizeof(control)); | |
2598 | control.sframe = 1; | |
2599 | control.super = L2CAP_SUPER_SREJ; | |
2600 | ||
2601 | /* Capture initial list head to allow only one pass through the list. */ | |
2602 | initial_head = chan->srej_list.head; | |
2603 | ||
2604 | do { | |
2605 | seq = l2cap_seq_list_pop(&chan->srej_list); | |
2606 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) | |
2607 | break; | |
2608 | ||
2609 | control.reqseq = seq; | |
2610 | l2cap_send_sframe(chan, &control); | |
2611 | l2cap_seq_list_append(&chan->srej_list, seq); | |
2612 | } while (chan->srej_list.head != initial_head); | |
d2a7ac5d MM |
2613 | } |
2614 | ||
608bcc6d MM |
2615 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2616 | { | |
2617 | struct sk_buff *acked_skb; | |
2618 | u16 ackseq; | |
2619 | ||
b4400672 | 2620 | BT_DBG("chan %p, reqseq %u", chan, reqseq); |
608bcc6d MM |
2621 | |
2622 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) | |
2623 | return; | |
2624 | ||
b4400672 | 2625 | BT_DBG("expected_ack_seq %u, unacked_frames %u", |
608bcc6d MM |
2626 | chan->expected_ack_seq, chan->unacked_frames); |
2627 | ||
2628 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; | |
2629 | ackseq = __next_seq(chan, ackseq)) { | |
2630 | ||
2631 | acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq); | |
2632 | if (acked_skb) { | |
2633 | skb_unlink(acked_skb, &chan->tx_q); | |
2634 | kfree_skb(acked_skb); | |
2635 | chan->unacked_frames--; | |
2636 | } | |
2637 | } | |
2638 | ||
2639 | chan->expected_ack_seq = reqseq; | |
2640 | ||
2641 | if (chan->unacked_frames == 0) | |
2642 | __clear_retrans_timer(chan); | |
2643 | ||
b4400672 | 2644 | BT_DBG("unacked_frames %u", chan->unacked_frames); |
608bcc6d MM |
2645 | } |
2646 | ||
2647 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) | |
2648 | { | |
2649 | BT_DBG("chan %p", chan); | |
2650 | ||
2651 | chan->expected_tx_seq = chan->buffer_seq; | |
2652 | l2cap_seq_list_clear(&chan->srej_list); | |
2653 | skb_queue_purge(&chan->srej_q); | |
2654 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2655 | } | |
2656 | ||
d660366d GP |
2657 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2658 | struct l2cap_ctrl *control, | |
2659 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2660 | { |
608bcc6d MM |
2661 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2662 | event); | |
2663 | ||
2664 | switch (event) { | |
2665 | case L2CAP_EV_DATA_REQUEST: | |
2666 | if (chan->tx_send_head == NULL) | |
2667 | chan->tx_send_head = skb_peek(skbs); | |
2668 | ||
2669 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2670 | l2cap_ertm_send(chan); | |
2671 | break; | |
2672 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2673 | BT_DBG("Enter LOCAL_BUSY"); | |
2674 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2675 | ||
2676 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2677 | /* The SREJ_SENT state must be aborted if we are to | |
2678 | * enter the LOCAL_BUSY state. | |
2679 | */ | |
2680 | l2cap_abort_rx_srej_sent(chan); | |
2681 | } | |
2682 | ||
2683 | l2cap_send_ack(chan); | |
2684 | ||
2685 | break; | |
2686 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2687 | BT_DBG("Exit LOCAL_BUSY"); | |
2688 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2689 | ||
2690 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2691 | struct l2cap_ctrl local_control; | |
2692 | ||
2693 | memset(&local_control, 0, sizeof(local_control)); | |
2694 | local_control.sframe = 1; | |
2695 | local_control.super = L2CAP_SUPER_RR; | |
2696 | local_control.poll = 1; | |
2697 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2698 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2699 | |
2700 | chan->retry_count = 1; | |
2701 | __set_monitor_timer(chan); | |
2702 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2703 | } | |
2704 | break; | |
2705 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2706 | l2cap_process_reqseq(chan, control->reqseq); | |
2707 | break; | |
2708 | case L2CAP_EV_EXPLICIT_POLL: | |
2709 | l2cap_send_rr_or_rnr(chan, 1); | |
2710 | chan->retry_count = 1; | |
2711 | __set_monitor_timer(chan); | |
2712 | __clear_ack_timer(chan); | |
2713 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2714 | break; | |
2715 | case L2CAP_EV_RETRANS_TO: | |
2716 | l2cap_send_rr_or_rnr(chan, 1); | |
2717 | chan->retry_count = 1; | |
2718 | __set_monitor_timer(chan); | |
2719 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2720 | break; | |
2721 | case L2CAP_EV_RECV_FBIT: | |
2722 | /* Nothing to process */ | |
2723 | break; | |
2724 | default: | |
2725 | break; | |
2726 | } | |
608bcc6d MM |
2727 | } |
2728 | ||
d660366d GP |
2729 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2730 | struct l2cap_ctrl *control, | |
2731 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2732 | { |
608bcc6d MM |
2733 | BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs, |
2734 | event); | |
2735 | ||
2736 | switch (event) { | |
2737 | case L2CAP_EV_DATA_REQUEST: | |
2738 | if (chan->tx_send_head == NULL) | |
2739 | chan->tx_send_head = skb_peek(skbs); | |
2740 | /* Queue data, but don't send. */ | |
2741 | skb_queue_splice_tail_init(skbs, &chan->tx_q); | |
2742 | break; | |
2743 | case L2CAP_EV_LOCAL_BUSY_DETECTED: | |
2744 | BT_DBG("Enter LOCAL_BUSY"); | |
2745 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2746 | ||
2747 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
2748 | /* The SREJ_SENT state must be aborted if we are to | |
2749 | * enter the LOCAL_BUSY state. | |
2750 | */ | |
2751 | l2cap_abort_rx_srej_sent(chan); | |
2752 | } | |
2753 | ||
2754 | l2cap_send_ack(chan); | |
2755 | ||
2756 | break; | |
2757 | case L2CAP_EV_LOCAL_BUSY_CLEAR: | |
2758 | BT_DBG("Exit LOCAL_BUSY"); | |
2759 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); | |
2760 | ||
2761 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { | |
2762 | struct l2cap_ctrl local_control; | |
2763 | memset(&local_control, 0, sizeof(local_control)); | |
2764 | local_control.sframe = 1; | |
2765 | local_control.super = L2CAP_SUPER_RR; | |
2766 | local_control.poll = 1; | |
2767 | local_control.reqseq = chan->buffer_seq; | |
a67d7f6f | 2768 | l2cap_send_sframe(chan, &local_control); |
608bcc6d MM |
2769 | |
2770 | chan->retry_count = 1; | |
2771 | __set_monitor_timer(chan); | |
2772 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; | |
2773 | } | |
2774 | break; | |
2775 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: | |
2776 | l2cap_process_reqseq(chan, control->reqseq); | |
2777 | ||
2778 | /* Fall through */ | |
2779 | ||
2780 | case L2CAP_EV_RECV_FBIT: | |
2781 | if (control && control->final) { | |
2782 | __clear_monitor_timer(chan); | |
2783 | if (chan->unacked_frames > 0) | |
2784 | __set_retrans_timer(chan); | |
2785 | chan->retry_count = 0; | |
2786 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
2787 | BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state); | |
2788 | } | |
2789 | break; | |
2790 | case L2CAP_EV_EXPLICIT_POLL: | |
2791 | /* Ignore */ | |
2792 | break; | |
2793 | case L2CAP_EV_MONITOR_TO: | |
2794 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { | |
2795 | l2cap_send_rr_or_rnr(chan, 1); | |
2796 | __set_monitor_timer(chan); | |
2797 | chan->retry_count++; | |
2798 | } else { | |
5e4e3972 | 2799 | l2cap_send_disconn_req(chan, ECONNABORTED); |
608bcc6d MM |
2800 | } |
2801 | break; | |
2802 | default: | |
2803 | break; | |
2804 | } | |
608bcc6d MM |
2805 | } |
2806 | ||
d660366d GP |
2807 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
2808 | struct sk_buff_head *skbs, u8 event) | |
608bcc6d | 2809 | { |
608bcc6d MM |
2810 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d", |
2811 | chan, control, skbs, event, chan->tx_state); | |
2812 | ||
2813 | switch (chan->tx_state) { | |
2814 | case L2CAP_TX_STATE_XMIT: | |
d660366d | 2815 | l2cap_tx_state_xmit(chan, control, skbs, event); |
608bcc6d MM |
2816 | break; |
2817 | case L2CAP_TX_STATE_WAIT_F: | |
d660366d | 2818 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
608bcc6d MM |
2819 | break; |
2820 | default: | |
2821 | /* Ignore event */ | |
2822 | break; | |
2823 | } | |
608bcc6d MM |
2824 | } |
2825 | ||
4b51dae9 MM |
2826 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
2827 | struct l2cap_ctrl *control) | |
2828 | { | |
2829 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2830 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
4b51dae9 MM |
2831 | } |
2832 | ||
f80842a8 MM |
2833 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
2834 | struct l2cap_ctrl *control) | |
2835 | { | |
2836 | BT_DBG("chan %p, control %p", chan, control); | |
401bb1f7 | 2837 | l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT); |
f80842a8 MM |
2838 | } |
2839 | ||
1da177e4 LT |
2840 | /* Copy frame to all raw sockets on that connection */ |
2841 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2842 | { | |
1da177e4 | 2843 | struct sk_buff *nskb; |
48454079 | 2844 | struct l2cap_chan *chan; |
1da177e4 LT |
2845 | |
2846 | BT_DBG("conn %p", conn); | |
2847 | ||
3df91ea2 | 2848 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2849 | |
3df91ea2 | 2850 | list_for_each_entry(chan, &conn->chan_l, list) { |
715ec005 | 2851 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2852 | continue; |
2853 | ||
7f5396a7 | 2854 | /* Don't send frame to the channel it came from */ |
a4368ff3 | 2855 | if (bt_cb(skb)->l2cap.chan == chan) |
1da177e4 | 2856 | continue; |
7f5396a7 | 2857 | |
8bcde1f2 | 2858 | nskb = skb_clone(skb, GFP_KERNEL); |
af05b30b | 2859 | if (!nskb) |
1da177e4 | 2860 | continue; |
80b98027 | 2861 | if (chan->ops->recv(chan, nskb)) |
1da177e4 LT |
2862 | kfree_skb(nskb); |
2863 | } | |
3d57dc68 | 2864 | |
3df91ea2 | 2865 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2866 | } |
2867 | ||
2868 | /* ---- L2CAP signalling commands ---- */ | |
b4400672 AE |
2869 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
2870 | u8 ident, u16 dlen, void *data) | |
1da177e4 LT |
2871 | { |
2872 | struct sk_buff *skb, **frag; | |
2873 | struct l2cap_cmd_hdr *cmd; | |
2874 | struct l2cap_hdr *lh; | |
2875 | int len, count; | |
2876 | ||
b4400672 AE |
2877 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u", |
2878 | conn, code, ident, dlen); | |
1da177e4 | 2879 | |
300b962e AL |
2880 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
2881 | return NULL; | |
2882 | ||
1da177e4 LT |
2883 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2884 | count = min_t(unsigned int, conn->mtu, len); | |
2885 | ||
8bcde1f2 | 2886 | skb = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2887 | if (!skb) |
2888 | return NULL; | |
2889 | ||
2890 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2891 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2892 | |
2893 | if (conn->hcon->type == LE_LINK) | |
dcf4adbf | 2894 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3300d9a9 | 2895 | else |
dcf4adbf | 2896 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2897 | |
2898 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2899 | cmd->code = code; | |
2900 | cmd->ident = ident; | |
aca3192c | 2901 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2902 | |
2903 | if (dlen) { | |
2904 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2905 | memcpy(skb_put(skb, count), data, count); | |
2906 | data += count; | |
2907 | } | |
2908 | ||
2909 | len -= skb->len; | |
2910 | ||
2911 | /* Continuation fragments (no L2CAP header) */ | |
2912 | frag = &skb_shinfo(skb)->frag_list; | |
2913 | while (len) { | |
2914 | count = min_t(unsigned int, conn->mtu, len); | |
2915 | ||
8bcde1f2 | 2916 | *frag = bt_skb_alloc(count, GFP_KERNEL); |
1da177e4 LT |
2917 | if (!*frag) |
2918 | goto fail; | |
2919 | ||
2920 | memcpy(skb_put(*frag, count), data, count); | |
2921 | ||
2922 | len -= count; | |
2923 | data += count; | |
2924 | ||
2925 | frag = &(*frag)->next; | |
2926 | } | |
2927 | ||
2928 | return skb; | |
2929 | ||
2930 | fail: | |
2931 | kfree_skb(skb); | |
2932 | return NULL; | |
2933 | } | |
2934 | ||
2d792818 GP |
2935 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
2936 | unsigned long *val) | |
1da177e4 LT |
2937 | { |
2938 | struct l2cap_conf_opt *opt = *ptr; | |
2939 | int len; | |
2940 | ||
2941 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2942 | *ptr += len; | |
2943 | ||
2944 | *type = opt->type; | |
2945 | *olen = opt->len; | |
2946 | ||
2947 | switch (opt->len) { | |
2948 | case 1: | |
2949 | *val = *((u8 *) opt->val); | |
2950 | break; | |
2951 | ||
2952 | case 2: | |
bfaaeb3e | 2953 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2954 | break; |
2955 | ||
2956 | case 4: | |
bfaaeb3e | 2957 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2958 | break; |
2959 | ||
2960 | default: | |
2961 | *val = (unsigned long) opt->val; | |
2962 | break; | |
2963 | } | |
2964 | ||
b4400672 | 2965 | BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val); |
1da177e4 LT |
2966 | return len; |
2967 | } | |
2968 | ||
1da177e4 LT |
2969 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2970 | { | |
2971 | struct l2cap_conf_opt *opt = *ptr; | |
2972 | ||
b4400672 | 2973 | BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val); |
1da177e4 LT |
2974 | |
2975 | opt->type = type; | |
2976 | opt->len = len; | |
2977 | ||
2978 | switch (len) { | |
2979 | case 1: | |
2980 | *((u8 *) opt->val) = val; | |
2981 | break; | |
2982 | ||
2983 | case 2: | |
4f8b691c | 2984 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2985 | break; |
2986 | ||
2987 | case 4: | |
4f8b691c | 2988 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2989 | break; |
2990 | ||
2991 | default: | |
2992 | memcpy(opt->val, (void *) val, len); | |
2993 | break; | |
2994 | } | |
2995 | ||
2996 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2997 | } | |
2998 | ||
f89cef09 AE |
2999 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
3000 | { | |
3001 | struct l2cap_conf_efs efs; | |
3002 | ||
1ec918ce | 3003 | switch (chan->mode) { |
f89cef09 AE |
3004 | case L2CAP_MODE_ERTM: |
3005 | efs.id = chan->local_id; | |
3006 | efs.stype = chan->local_stype; | |
3007 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3008 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
dcf4adbf JP |
3009 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
3010 | efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); | |
f89cef09 AE |
3011 | break; |
3012 | ||
3013 | case L2CAP_MODE_STREAMING: | |
3014 | efs.id = 1; | |
3015 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
3016 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
3017 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
3018 | efs.acc_lat = 0; | |
3019 | efs.flush_to = 0; | |
3020 | break; | |
3021 | ||
3022 | default: | |
3023 | return; | |
3024 | } | |
3025 | ||
3026 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
8936fa6d | 3027 | (unsigned long) &efs); |
f89cef09 AE |
3028 | } |
3029 | ||
721c4181 | 3030 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 3031 | { |
721c4181 | 3032 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
0362520b MM |
3033 | ack_timer.work); |
3034 | u16 frames_to_ack; | |
c1b4f43b | 3035 | |
2fb9b3d4 GP |
3036 | BT_DBG("chan %p", chan); |
3037 | ||
6be36555 AE |
3038 | l2cap_chan_lock(chan); |
3039 | ||
0362520b MM |
3040 | frames_to_ack = __seq_offset(chan, chan->buffer_seq, |
3041 | chan->last_acked_seq); | |
6be36555 | 3042 | |
0362520b MM |
3043 | if (frames_to_ack) |
3044 | l2cap_send_rr_or_rnr(chan, 0); | |
09bfb2ee | 3045 | |
0362520b | 3046 | l2cap_chan_unlock(chan); |
09bfb2ee | 3047 | l2cap_chan_put(chan); |
c1b4f43b GP |
3048 | } |
3049 | ||
466f8004 | 3050 | int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 3051 | { |
3c588192 MM |
3052 | int err; |
3053 | ||
105bdf9e MM |
3054 | chan->next_tx_seq = 0; |
3055 | chan->expected_tx_seq = 0; | |
42e5c802 | 3056 | chan->expected_ack_seq = 0; |
6a026610 | 3057 | chan->unacked_frames = 0; |
42e5c802 | 3058 | chan->buffer_seq = 0; |
6a026610 | 3059 | chan->frames_sent = 0; |
105bdf9e MM |
3060 | chan->last_acked_seq = 0; |
3061 | chan->sdu = NULL; | |
3062 | chan->sdu_last_frag = NULL; | |
3063 | chan->sdu_len = 0; | |
3064 | ||
d34c34fb MM |
3065 | skb_queue_head_init(&chan->tx_q); |
3066 | ||
6ed971ca MH |
3067 | chan->local_amp_id = AMP_ID_BREDR; |
3068 | chan->move_id = AMP_ID_BREDR; | |
08333283 MM |
3069 | chan->move_state = L2CAP_MOVE_STABLE; |
3070 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
3071 | ||
105bdf9e MM |
3072 | if (chan->mode != L2CAP_MODE_ERTM) |
3073 | return 0; | |
3074 | ||
3075 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
3076 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 3077 | |
721c4181 GP |
3078 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
3079 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
3080 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 3081 | |
f1c6775b | 3082 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 3083 | |
3c588192 MM |
3084 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
3085 | if (err < 0) | |
3086 | return err; | |
3087 | ||
9dc9affc MM |
3088 | err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); |
3089 | if (err < 0) | |
3090 | l2cap_seq_list_free(&chan->srej_list); | |
3091 | ||
3092 | return err; | |
0565c1c2 GP |
3093 | } |
3094 | ||
f2fcfcd6 GP |
3095 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3096 | { | |
3097 | switch (mode) { | |
3098 | case L2CAP_MODE_STREAMING: | |
3099 | case L2CAP_MODE_ERTM: | |
3100 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
3101 | return mode; | |
3102 | /* fall through */ | |
3103 | default: | |
3104 | return L2CAP_MODE_BASIC; | |
3105 | } | |
3106 | } | |
3107 | ||
848566b3 | 3108 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
6327eb98 | 3109 | { |
0bd49fc7 JH |
3110 | return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && |
3111 | (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW)); | |
6327eb98 AE |
3112 | } |
3113 | ||
848566b3 | 3114 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
f89cef09 | 3115 | { |
0bd49fc7 JH |
3116 | return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && |
3117 | (conn->feat_mask & L2CAP_FEAT_EXT_FLOW)); | |
f89cef09 AE |
3118 | } |
3119 | ||
36c86c85 MM |
3120 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3121 | struct l2cap_conf_rfc *rfc) | |
3122 | { | |
6ed971ca | 3123 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
36c86c85 MM |
3124 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3125 | ||
3126 | /* Class 1 devices have must have ERTM timeouts | |
3127 | * exceeding the Link Supervision Timeout. The | |
3128 | * default Link Supervision Timeout for AMP | |
3129 | * controllers is 10 seconds. | |
3130 | * | |
3131 | * Class 1 devices use 0xffffffff for their | |
3132 | * best-effort flush timeout, so the clamping logic | |
3133 | * will result in a timeout that meets the above | |
3134 | * requirement. ERTM timeouts are 16-bit values, so | |
3135 | * the maximum timeout is 65.535 seconds. | |
3136 | */ | |
3137 | ||
3138 | /* Convert timeout to milliseconds and round */ | |
3139 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); | |
3140 | ||
3141 | /* This is the recommended formula for class 2 devices | |
3142 | * that start ERTM timers when packets are sent to the | |
3143 | * controller. | |
3144 | */ | |
3145 | ertm_to = 3 * ertm_to + 500; | |
3146 | ||
3147 | if (ertm_to > 0xffff) | |
3148 | ertm_to = 0xffff; | |
3149 | ||
3150 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); | |
3151 | rfc->monitor_timeout = rfc->retrans_timeout; | |
3152 | } else { | |
dcf4adbf JP |
3153 | rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3154 | rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
36c86c85 MM |
3155 | } |
3156 | } | |
3157 | ||
6327eb98 AE |
3158 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3159 | { | |
3160 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
848566b3 | 3161 | __l2cap_ews_supported(chan->conn)) { |
6327eb98 AE |
3162 | /* use extended control field */ |
3163 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
3164 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3165 | } else { | |
6327eb98 | 3166 | chan->tx_win = min_t(u16, chan->tx_win, |
2d792818 | 3167 | L2CAP_DEFAULT_TX_WINDOW); |
836be934 AE |
3168 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3169 | } | |
c20f8e35 | 3170 | chan->ack_win = chan->tx_win; |
6327eb98 AE |
3171 | } |
3172 | ||
710f9b0a | 3173 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3174 | { |
1da177e4 | 3175 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 3176 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 3177 | void *ptr = req->data; |
c8f79162 | 3178 | u16 size; |
1da177e4 | 3179 | |
49208c9c | 3180 | BT_DBG("chan %p", chan); |
1da177e4 | 3181 | |
73ffa904 | 3182 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
3183 | goto done; |
3184 | ||
0c1bc5c6 | 3185 | switch (chan->mode) { |
f2fcfcd6 GP |
3186 | case L2CAP_MODE_STREAMING: |
3187 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3188 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 3189 | break; |
85eb53c6 | 3190 | |
848566b3 | 3191 | if (__l2cap_efs_supported(chan->conn)) |
f89cef09 AE |
3192 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3193 | ||
2ba13ed6 | 3194 | /* fall through */ |
f2fcfcd6 | 3195 | default: |
8c1d787b | 3196 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
3197 | break; |
3198 | } | |
3199 | ||
3200 | done: | |
0c1bc5c6 GP |
3201 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
3202 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 3203 | |
0c1bc5c6 | 3204 | switch (chan->mode) { |
65c7c491 | 3205 | case L2CAP_MODE_BASIC: |
6fea7ad1 MH |
3206 | if (disable_ertm) |
3207 | break; | |
3208 | ||
8c1d787b | 3209 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2d792818 | 3210 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
63406504 GP |
3211 | break; |
3212 | ||
62547752 GP |
3213 | rfc.mode = L2CAP_MODE_BASIC; |
3214 | rfc.txwin_size = 0; | |
3215 | rfc.max_transmit = 0; | |
3216 | rfc.retrans_timeout = 0; | |
3217 | rfc.monitor_timeout = 0; | |
3218 | rfc.max_pdu_size = 0; | |
3219 | ||
63406504 | 3220 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3221 | (unsigned long) &rfc); |
65c7c491 MH |
3222 | break; |
3223 | ||
3224 | case L2CAP_MODE_ERTM: | |
3225 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 3226 | rfc.max_transmit = chan->max_tx; |
36c86c85 MM |
3227 | |
3228 | __l2cap_set_ertm_timeouts(chan, &rfc); | |
c8f79162 AE |
3229 | |
3230 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3231 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3232 | L2CAP_FCS_SIZE); | |
c8f79162 | 3233 | rfc.max_pdu_size = cpu_to_le16(size); |
f2fcfcd6 | 3234 | |
6327eb98 AE |
3235 | l2cap_txwin_setup(chan); |
3236 | ||
3237 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2d792818 | 3238 | L2CAP_DEFAULT_TX_WINDOW); |
f2fcfcd6 | 3239 | |
63406504 | 3240 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3241 | (unsigned long) &rfc); |
63406504 | 3242 | |
f89cef09 AE |
3243 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3244 | l2cap_add_opt_efs(&ptr, chan); | |
3245 | ||
6327eb98 AE |
3246 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3247 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2d792818 | 3248 | chan->tx_win); |
60918918 AE |
3249 | |
3250 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) | |
3251 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3252 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3253 | chan->fcs = L2CAP_FCS_NONE; |
3254 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3255 | chan->fcs); | |
3256 | } | |
f2fcfcd6 GP |
3257 | break; |
3258 | ||
3259 | case L2CAP_MODE_STREAMING: | |
273759e2 | 3260 | l2cap_txwin_setup(chan); |
f2fcfcd6 GP |
3261 | rfc.mode = L2CAP_MODE_STREAMING; |
3262 | rfc.txwin_size = 0; | |
3263 | rfc.max_transmit = 0; | |
3264 | rfc.retrans_timeout = 0; | |
3265 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
3266 | |
3267 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2d792818 GP |
3268 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3269 | L2CAP_FCS_SIZE); | |
c8f79162 | 3270 | rfc.max_pdu_size = cpu_to_le16(size); |
65c7c491 | 3271 | |
63406504 | 3272 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2d792818 | 3273 | (unsigned long) &rfc); |
63406504 | 3274 | |
f89cef09 AE |
3275 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3276 | l2cap_add_opt_efs(&ptr, chan); | |
3277 | ||
60918918 AE |
3278 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3279 | if (chan->fcs == L2CAP_FCS_NONE || | |
f2592d3e | 3280 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
60918918 AE |
3281 | chan->fcs = L2CAP_FCS_NONE; |
3282 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, | |
3283 | chan->fcs); | |
3284 | } | |
65c7c491 MH |
3285 | break; |
3286 | } | |
1da177e4 | 3287 | |
fe4128e0 | 3288 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3289 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
3290 | |
3291 | return ptr - data; | |
3292 | } | |
3293 | ||
73ffa904 | 3294 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 3295 | { |
5dee9e7c MH |
3296 | struct l2cap_conf_rsp *rsp = data; |
3297 | void *ptr = rsp->data; | |
73ffa904 GP |
3298 | void *req = chan->conf_req; |
3299 | int len = chan->conf_len; | |
5dee9e7c MH |
3300 | int type, hint, olen; |
3301 | unsigned long val; | |
6464f35f | 3302 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
3303 | struct l2cap_conf_efs efs; |
3304 | u8 remote_efs = 0; | |
861d6882 | 3305 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 3306 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 3307 | u16 size; |
1da177e4 | 3308 | |
73ffa904 | 3309 | BT_DBG("chan %p", chan); |
820ae1b8 | 3310 | |
5dee9e7c MH |
3311 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3312 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 3313 | |
589d2746 | 3314 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 3315 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
3316 | |
3317 | switch (type) { | |
3318 | case L2CAP_CONF_MTU: | |
861d6882 | 3319 | mtu = val; |
5dee9e7c MH |
3320 | break; |
3321 | ||
3322 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3323 | chan->flush_to = val; |
5dee9e7c MH |
3324 | break; |
3325 | ||
3326 | case L2CAP_CONF_QOS: | |
3327 | break; | |
3328 | ||
6464f35f MH |
3329 | case L2CAP_CONF_RFC: |
3330 | if (olen == sizeof(rfc)) | |
3331 | memcpy(&rfc, (void *) val, olen); | |
3332 | break; | |
3333 | ||
fcc203c3 GP |
3334 | case L2CAP_CONF_FCS: |
3335 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3336 | set_bit(CONF_RECV_NO_FCS, &chan->conf_state); |
42dceae2 | 3337 | break; |
fcc203c3 | 3338 | |
42dceae2 AE |
3339 | case L2CAP_CONF_EFS: |
3340 | remote_efs = 1; | |
3341 | if (olen == sizeof(efs)) | |
3342 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
3343 | break; |
3344 | ||
6327eb98 | 3345 | case L2CAP_CONF_EWS: |
0bd49fc7 | 3346 | if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP)) |
6327eb98 | 3347 | return -ECONNREFUSED; |
fcc203c3 | 3348 | |
6327eb98 AE |
3349 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
3350 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 3351 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 3352 | chan->remote_tx_win = val; |
fcc203c3 GP |
3353 | break; |
3354 | ||
5dee9e7c MH |
3355 | default: |
3356 | if (hint) | |
3357 | break; | |
3358 | ||
3359 | result = L2CAP_CONF_UNKNOWN; | |
3360 | *((u8 *) ptr++) = type; | |
3361 | break; | |
3362 | } | |
3363 | } | |
3364 | ||
73ffa904 | 3365 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
3366 | goto done; |
3367 | ||
0c1bc5c6 | 3368 | switch (chan->mode) { |
f2fcfcd6 GP |
3369 | case L2CAP_MODE_STREAMING: |
3370 | case L2CAP_MODE_ERTM: | |
c1360a1c | 3371 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 3372 | chan->mode = l2cap_select_mode(rfc.mode, |
2d792818 | 3373 | chan->conn->feat_mask); |
85eb53c6 GP |
3374 | break; |
3375 | } | |
3376 | ||
42dceae2 | 3377 | if (remote_efs) { |
848566b3 | 3378 | if (__l2cap_efs_supported(chan->conn)) |
42dceae2 AE |
3379 | set_bit(FLAG_EFS_ENABLE, &chan->flags); |
3380 | else | |
3381 | return -ECONNREFUSED; | |
3382 | } | |
3383 | ||
0c1bc5c6 | 3384 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 3385 | return -ECONNREFUSED; |
742e519b | 3386 | |
f2fcfcd6 | 3387 | break; |
f2fcfcd6 GP |
3388 | } |
3389 | ||
3390 | done: | |
0c1bc5c6 | 3391 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 3392 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 3393 | rfc.mode = chan->mode; |
f2fcfcd6 | 3394 | |
73ffa904 | 3395 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
3396 | return -ECONNREFUSED; |
3397 | ||
2d792818 GP |
3398 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3399 | (unsigned long) &rfc); | |
f2fcfcd6 GP |
3400 | } |
3401 | ||
5dee9e7c MH |
3402 | if (result == L2CAP_CONF_SUCCESS) { |
3403 | /* Configure output options and let the other side know | |
3404 | * which ones we don't like. */ | |
3405 | ||
f2fcfcd6 GP |
3406 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3407 | result = L2CAP_CONF_UNACCEPT; | |
3408 | else { | |
0c1bc5c6 | 3409 | chan->omtu = mtu; |
c1360a1c | 3410 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 3411 | } |
0c1bc5c6 | 3412 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 3413 | |
42dceae2 AE |
3414 | if (remote_efs) { |
3415 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3416 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3417 | efs.stype != chan->local_stype) { | |
42dceae2 AE |
3418 | |
3419 | result = L2CAP_CONF_UNACCEPT; | |
3420 | ||
3421 | if (chan->num_conf_req >= 1) | |
3422 | return -ECONNREFUSED; | |
3423 | ||
3424 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3425 | sizeof(efs), |
3426 | (unsigned long) &efs); | |
0e8b207e | 3427 | } else { |
3e6b3b95 | 3428 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
3429 | result = L2CAP_CONF_PENDING; |
3430 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
3431 | } |
3432 | } | |
3433 | ||
f2fcfcd6 GP |
3434 | switch (rfc.mode) { |
3435 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 3436 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3437 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
3438 | break; |
3439 | ||
3440 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
3441 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3442 | chan->remote_tx_win = rfc.txwin_size; | |
3443 | else | |
3444 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 3445 | |
2c03a7a4 | 3446 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 3447 | |
c8f79162 | 3448 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3449 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3450 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3451 | rfc.max_pdu_size = cpu_to_le16(size); |
3452 | chan->remote_mps = size; | |
f2fcfcd6 | 3453 | |
36c86c85 | 3454 | __l2cap_set_ertm_timeouts(chan, &rfc); |
f2fcfcd6 | 3455 | |
c1360a1c | 3456 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
3457 | |
3458 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3459 | sizeof(rfc), (unsigned long) &rfc); |
68ae6639 | 3460 | |
42dceae2 AE |
3461 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3462 | chan->remote_id = efs.id; | |
3463 | chan->remote_stype = efs.stype; | |
3464 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
3465 | chan->remote_flush_to = | |
2d792818 | 3466 | le32_to_cpu(efs.flush_to); |
42dceae2 | 3467 | chan->remote_acc_lat = |
2d792818 | 3468 | le32_to_cpu(efs.acc_lat); |
42dceae2 AE |
3469 | chan->remote_sdu_itime = |
3470 | le32_to_cpu(efs.sdu_itime); | |
3471 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2d792818 GP |
3472 | sizeof(efs), |
3473 | (unsigned long) &efs); | |
42dceae2 | 3474 | } |
f2fcfcd6 GP |
3475 | break; |
3476 | ||
3477 | case L2CAP_MODE_STREAMING: | |
c8f79162 | 3478 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2d792818 GP |
3479 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3480 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); | |
c8f79162 AE |
3481 | rfc.max_pdu_size = cpu_to_le16(size); |
3482 | chan->remote_mps = size; | |
f2fcfcd6 | 3483 | |
c1360a1c | 3484 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 | 3485 | |
2d792818 GP |
3486 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
3487 | (unsigned long) &rfc); | |
68ae6639 | 3488 | |
f2fcfcd6 GP |
3489 | break; |
3490 | ||
3491 | default: | |
5dee9e7c | 3492 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 3493 | |
6464f35f | 3494 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 3495 | rfc.mode = chan->mode; |
f2fcfcd6 | 3496 | } |
6464f35f | 3497 | |
f2fcfcd6 | 3498 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 3499 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 3500 | } |
fe4128e0 | 3501 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3502 | rsp->result = cpu_to_le16(result); |
dcf4adbf | 3503 | rsp->flags = cpu_to_le16(0); |
5dee9e7c MH |
3504 | |
3505 | return ptr - data; | |
1da177e4 LT |
3506 | } |
3507 | ||
2d792818 GP |
3508 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3509 | void *data, u16 *result) | |
f2fcfcd6 | 3510 | { |
f2fcfcd6 GP |
3511 | struct l2cap_conf_req *req = data; |
3512 | void *ptr = req->data; | |
3513 | int type, olen; | |
3514 | unsigned long val; | |
36e999a8 | 3515 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 3516 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 3517 | |
fe4128e0 | 3518 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
3519 | |
3520 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3521 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3522 | ||
3523 | switch (type) { | |
3524 | case L2CAP_CONF_MTU: | |
3525 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
3526 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 3527 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 3528 | } else |
0c1bc5c6 GP |
3529 | chan->imtu = val; |
3530 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
3531 | break; |
3532 | ||
3533 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 3534 | chan->flush_to = val; |
f2fcfcd6 | 3535 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2d792818 | 3536 | 2, chan->flush_to); |
f2fcfcd6 GP |
3537 | break; |
3538 | ||
3539 | case L2CAP_CONF_RFC: | |
3540 | if (olen == sizeof(rfc)) | |
3541 | memcpy(&rfc, (void *)val, olen); | |
3542 | ||
c1360a1c | 3543 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
2d792818 | 3544 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
3545 | return -ECONNREFUSED; |
3546 | ||
47d1ec61 | 3547 | chan->fcs = 0; |
f2fcfcd6 GP |
3548 | |
3549 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2d792818 | 3550 | sizeof(rfc), (unsigned long) &rfc); |
f2fcfcd6 | 3551 | break; |
6327eb98 AE |
3552 | |
3553 | case L2CAP_CONF_EWS: | |
c20f8e35 | 3554 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3e6b3b95 | 3555 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
c20f8e35 | 3556 | chan->tx_win); |
6327eb98 | 3557 | break; |
66af7aaf AE |
3558 | |
3559 | case L2CAP_CONF_EFS: | |
3560 | if (olen == sizeof(efs)) | |
3561 | memcpy(&efs, (void *)val, olen); | |
3562 | ||
3563 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2d792818 GP |
3564 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3565 | efs.stype != chan->local_stype) | |
66af7aaf AE |
3566 | return -ECONNREFUSED; |
3567 | ||
2d792818 GP |
3568 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs), |
3569 | (unsigned long) &efs); | |
66af7aaf | 3570 | break; |
cbabee78 AE |
3571 | |
3572 | case L2CAP_CONF_FCS: | |
3573 | if (*result == L2CAP_CONF_PENDING) | |
3574 | if (val == L2CAP_FCS_NONE) | |
f2592d3e | 3575 | set_bit(CONF_RECV_NO_FCS, |
cbabee78 AE |
3576 | &chan->conf_state); |
3577 | break; | |
f2fcfcd6 GP |
3578 | } |
3579 | } | |
3580 | ||
0c1bc5c6 | 3581 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
3582 | return -ECONNREFUSED; |
3583 | ||
0c1bc5c6 | 3584 | chan->mode = rfc.mode; |
6c2ea7a8 | 3585 | |
0e8b207e | 3586 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
3587 | switch (rfc.mode) { |
3588 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3589 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3590 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
3591 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
c20f8e35 MM |
3592 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3593 | chan->ack_win = min_t(u16, chan->ack_win, | |
3594 | rfc.txwin_size); | |
66af7aaf AE |
3595 | |
3596 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
3597 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
3598 | chan->local_sdu_itime = | |
2d792818 | 3599 | le32_to_cpu(efs.sdu_itime); |
66af7aaf AE |
3600 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3601 | chan->local_flush_to = | |
2d792818 | 3602 | le32_to_cpu(efs.flush_to); |
66af7aaf | 3603 | } |
f2fcfcd6 | 3604 | break; |
66af7aaf | 3605 | |
f2fcfcd6 | 3606 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 3607 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
3608 | } |
3609 | } | |
3610 | ||
fe4128e0 | 3611 | req->dcid = cpu_to_le16(chan->dcid); |
dcf4adbf | 3612 | req->flags = cpu_to_le16(0); |
f2fcfcd6 GP |
3613 | |
3614 | return ptr - data; | |
3615 | } | |
3616 | ||
2d792818 GP |
3617 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3618 | u16 result, u16 flags) | |
1da177e4 LT |
3619 | { |
3620 | struct l2cap_conf_rsp *rsp = data; | |
3621 | void *ptr = rsp->data; | |
1da177e4 | 3622 | |
fe4128e0 | 3623 | BT_DBG("chan %p", chan); |
1da177e4 | 3624 | |
fe4128e0 | 3625 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 3626 | rsp->result = cpu_to_le16(result); |
aca3192c | 3627 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
3628 | |
3629 | return ptr - data; | |
3630 | } | |
3631 | ||
27e2d4c8 JH |
3632 | void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) |
3633 | { | |
3634 | struct l2cap_le_conn_rsp rsp; | |
3635 | struct l2cap_conn *conn = chan->conn; | |
3636 | ||
3637 | BT_DBG("chan %p", chan); | |
3638 | ||
3639 | rsp.dcid = cpu_to_le16(chan->scid); | |
3640 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 3641 | rsp.mps = cpu_to_le16(chan->mps); |
0cd75f7e | 3642 | rsp.credits = cpu_to_le16(chan->rx_credits); |
dcf4adbf | 3643 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
27e2d4c8 JH |
3644 | |
3645 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), | |
3646 | &rsp); | |
3647 | } | |
3648 | ||
8c1d787b | 3649 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
3650 | { |
3651 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 3652 | struct l2cap_conn *conn = chan->conn; |
710f9b0a | 3653 | u8 buf[128]; |
439f34ac | 3654 | u8 rsp_code; |
710f9b0a | 3655 | |
fe4128e0 GP |
3656 | rsp.scid = cpu_to_le16(chan->dcid); |
3657 | rsp.dcid = cpu_to_le16(chan->scid); | |
dcf4adbf JP |
3658 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
3659 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
439f34ac AE |
3660 | |
3661 | if (chan->hs_hcon) | |
3662 | rsp_code = L2CAP_CREATE_CHAN_RSP; | |
3663 | else | |
3664 | rsp_code = L2CAP_CONN_RSP; | |
3665 | ||
3666 | BT_DBG("chan %p rsp_code %u", chan, rsp_code); | |
3667 | ||
3668 | l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp); | |
710f9b0a | 3669 | |
c1360a1c | 3670 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
3671 | return; |
3672 | ||
710f9b0a | 3673 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3674 | l2cap_build_conf_req(chan, buf), buf); |
710f9b0a GP |
3675 | chan->num_conf_req++; |
3676 | } | |
3677 | ||
47d1ec61 | 3678 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 3679 | { |
7b1c0049 GP |
3680 | int type, olen; |
3681 | unsigned long val; | |
c20f8e35 MM |
3682 | /* Use sane default values in case a misbehaving remote device |
3683 | * did not send an RFC or extended window size option. | |
3684 | */ | |
3685 | u16 txwin_ext = chan->ack_win; | |
3686 | struct l2cap_conf_rfc rfc = { | |
3687 | .mode = chan->mode, | |
dcf4adbf JP |
3688 | .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), |
3689 | .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), | |
c20f8e35 MM |
3690 | .max_pdu_size = cpu_to_le16(chan->imtu), |
3691 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), | |
3692 | }; | |
7b1c0049 | 3693 | |
47d1ec61 | 3694 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 3695 | |
0c1bc5c6 | 3696 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
3697 | return; |
3698 | ||
3699 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
3700 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
3701 | ||
c20f8e35 MM |
3702 | switch (type) { |
3703 | case L2CAP_CONF_RFC: | |
3704 | if (olen == sizeof(rfc)) | |
3705 | memcpy(&rfc, (void *)val, olen); | |
8f321f85 | 3706 | break; |
c20f8e35 MM |
3707 | case L2CAP_CONF_EWS: |
3708 | txwin_ext = val; | |
3709 | break; | |
3710 | } | |
7b1c0049 GP |
3711 | } |
3712 | ||
7b1c0049 GP |
3713 | switch (rfc.mode) { |
3714 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
3715 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3716 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
c20f8e35 MM |
3717 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3718 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3719 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); | |
3720 | else | |
3721 | chan->ack_win = min_t(u16, chan->ack_win, | |
3722 | rfc.txwin_size); | |
7b1c0049 GP |
3723 | break; |
3724 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 3725 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
3726 | } |
3727 | } | |
3728 | ||
2d792818 | 3729 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
cb3b3152 JH |
3730 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3731 | u8 *data) | |
4e8402a3 | 3732 | { |
e2fd318e | 3733 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 3734 | |
cb3b3152 JH |
3735 | if (cmd_len < sizeof(*rej)) |
3736 | return -EPROTO; | |
3737 | ||
e2fd318e | 3738 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
3739 | return 0; |
3740 | ||
3741 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2d792818 | 3742 | cmd->ident == conn->info_ident) { |
17cd3f37 | 3743 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
3744 | |
3745 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 3746 | conn->info_ident = 0; |
984947dc | 3747 | |
4e8402a3 MH |
3748 | l2cap_conn_start(conn); |
3749 | } | |
3750 | ||
3751 | return 0; | |
3752 | } | |
3753 | ||
1700915f MM |
3754 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
3755 | struct l2cap_cmd_hdr *cmd, | |
3756 | u8 *data, u8 rsp_code, u8 amp_id) | |
1da177e4 | 3757 | { |
1da177e4 LT |
3758 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
3759 | struct l2cap_conn_rsp rsp; | |
23691d75 | 3760 | struct l2cap_chan *chan = NULL, *pchan; |
e7c29cb1 | 3761 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
3762 | |
3763 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 3764 | __le16 psm = req->psm; |
1da177e4 | 3765 | |
097db76c | 3766 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
3767 | |
3768 | /* Check if we have socket listening on psm */ | |
6f59b904 | 3769 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, |
bf20fd4e | 3770 | &conn->hcon->dst, ACL_LINK); |
23691d75 | 3771 | if (!pchan) { |
1da177e4 LT |
3772 | result = L2CAP_CR_BAD_PSM; |
3773 | goto sendresp; | |
3774 | } | |
3775 | ||
3df91ea2 | 3776 | mutex_lock(&conn->chan_lock); |
8ffb9290 | 3777 | l2cap_chan_lock(pchan); |
e0f0cb56 | 3778 | |
e7c29cb1 | 3779 | /* Check if the ACL is secure enough (if not SDP) */ |
dcf4adbf | 3780 | if (psm != cpu_to_le16(L2CAP_PSM_SDP) && |
2d792818 | 3781 | !hci_conn_check_link_mode(conn->hcon)) { |
9f5a0d7b | 3782 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
3783 | result = L2CAP_CR_SEC_BLOCK; |
3784 | goto response; | |
3785 | } | |
3786 | ||
1da177e4 LT |
3787 | result = L2CAP_CR_NO_MEM; |
3788 | ||
2dfa1003 GP |
3789 | /* Check if we already have channel with that dcid */ |
3790 | if (__l2cap_get_chan_by_dcid(conn, scid)) | |
3791 | goto response; | |
3792 | ||
80b98027 | 3793 | chan = pchan->ops->new_connection(pchan); |
80808e43 | 3794 | if (!chan) |
1da177e4 LT |
3795 | goto response; |
3796 | ||
330b6c15 SS |
3797 | /* For certain devices (ex: HID mouse), support for authentication, |
3798 | * pairing and bonding is optional. For such devices, inorder to avoid | |
3799 | * the ACL alive for too long after L2CAP disconnection, reset the ACL | |
3800 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. | |
3801 | */ | |
3802 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; | |
3803 | ||
7eafc59e MH |
3804 | bacpy(&chan->src, &conn->hcon->src); |
3805 | bacpy(&chan->dst, &conn->hcon->dst); | |
a250e048 JH |
3806 | chan->src_type = bdaddr_src_type(conn->hcon); |
3807 | chan->dst_type = bdaddr_dst_type(conn->hcon); | |
fe4128e0 GP |
3808 | chan->psm = psm; |
3809 | chan->dcid = scid; | |
1700915f | 3810 | chan->local_amp_id = amp_id; |
1da177e4 | 3811 | |
6be36555 | 3812 | __l2cap_chan_add(conn, chan); |
48454079 | 3813 | |
fe4128e0 | 3814 | dcid = chan->scid; |
1da177e4 | 3815 | |
8d836d71 | 3816 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
1da177e4 | 3817 | |
fc7f8a7e | 3818 | chan->ident = cmd->ident; |
1da177e4 | 3819 | |
984947dc | 3820 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
e7cafc45 | 3821 | if (l2cap_chan_check_security(chan, false)) { |
bdc25783 | 3822 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
f93fa273 | 3823 | l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3824 | result = L2CAP_CR_PEND; |
3825 | status = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 3826 | chan->ops->defer(chan); |
f66dc81f | 3827 | } else { |
1700915f MM |
3828 | /* Force pending result for AMP controllers. |
3829 | * The connection will succeed after the | |
3830 | * physical link is up. | |
3831 | */ | |
6ed971ca | 3832 | if (amp_id == AMP_ID_BREDR) { |
f93fa273 | 3833 | l2cap_state_change(chan, BT_CONFIG); |
1700915f | 3834 | result = L2CAP_CR_SUCCESS; |
6ed971ca | 3835 | } else { |
f93fa273 | 3836 | l2cap_state_change(chan, BT_CONNECT2); |
6ed971ca | 3837 | result = L2CAP_CR_PEND; |
1700915f | 3838 | } |
f66dc81f MH |
3839 | status = L2CAP_CS_NO_INFO; |
3840 | } | |
79d554a6 | 3841 | } else { |
f93fa273 | 3842 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3843 | result = L2CAP_CR_PEND; |
3844 | status = L2CAP_CS_AUTHEN_PEND; | |
3845 | } | |
3846 | } else { | |
f93fa273 | 3847 | l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3848 | result = L2CAP_CR_PEND; |
3849 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3850 | } |
3851 | ||
1da177e4 | 3852 | response: |
8ffb9290 | 3853 | l2cap_chan_unlock(pchan); |
3df91ea2 | 3854 | mutex_unlock(&conn->chan_lock); |
a24cce14 | 3855 | l2cap_chan_put(pchan); |
1da177e4 LT |
3856 | |
3857 | sendresp: | |
aca3192c YH |
3858 | rsp.scid = cpu_to_le16(scid); |
3859 | rsp.dcid = cpu_to_le16(dcid); | |
3860 | rsp.result = cpu_to_le16(result); | |
3861 | rsp.status = cpu_to_le16(status); | |
4c89b6aa | 3862 | l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp); |
79d554a6 MH |
3863 | |
3864 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3865 | struct l2cap_info_req info; | |
dcf4adbf | 3866 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
79d554a6 MH |
3867 | |
3868 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3869 | conn->info_ident = l2cap_get_ident(conn); | |
3870 | ||
ba13ccd9 | 3871 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 | 3872 | |
2d792818 GP |
3873 | l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ, |
3874 | sizeof(info), &info); | |
79d554a6 MH |
3875 | } |
3876 | ||
c1360a1c | 3877 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
2d792818 | 3878 | result == L2CAP_CR_SUCCESS) { |
e9aeb2dd | 3879 | u8 buf[128]; |
c1360a1c | 3880 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3881 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3882 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 3883 | chan->num_conf_req++; |
e9aeb2dd | 3884 | } |
1700915f MM |
3885 | |
3886 | return chan; | |
4c89b6aa | 3887 | } |
e9aeb2dd | 3888 | |
4c89b6aa | 3889 | static int l2cap_connect_req(struct l2cap_conn *conn, |
cb3b3152 | 3890 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4c89b6aa | 3891 | { |
7b064eda JK |
3892 | struct hci_dev *hdev = conn->hcon->hdev; |
3893 | struct hci_conn *hcon = conn->hcon; | |
3894 | ||
cb3b3152 JH |
3895 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
3896 | return -EPROTO; | |
3897 | ||
7b064eda | 3898 | hci_dev_lock(hdev); |
d7a5a11d | 3899 | if (hci_dev_test_flag(hdev, HCI_MGMT) && |
7b064eda | 3900 | !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags)) |
48ec92fa | 3901 | mgmt_device_connected(hdev, hcon, 0, NULL, 0); |
7b064eda JK |
3902 | hci_dev_unlock(hdev); |
3903 | ||
300229f9 | 3904 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0); |
1da177e4 LT |
3905 | return 0; |
3906 | } | |
3907 | ||
5909cf30 | 3908 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
3909 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
3910 | u8 *data) | |
1da177e4 LT |
3911 | { |
3912 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3913 | u16 scid, dcid, result, status; | |
48454079 | 3914 | struct l2cap_chan *chan; |
1da177e4 | 3915 | u8 req[128]; |
3df91ea2 | 3916 | int err; |
1da177e4 | 3917 | |
cb3b3152 JH |
3918 | if (cmd_len < sizeof(*rsp)) |
3919 | return -EPROTO; | |
3920 | ||
1da177e4 LT |
3921 | scid = __le16_to_cpu(rsp->scid); |
3922 | dcid = __le16_to_cpu(rsp->dcid); | |
3923 | result = __le16_to_cpu(rsp->result); | |
3924 | status = __le16_to_cpu(rsp->status); | |
3925 | ||
1b009c98 | 3926 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
2d792818 | 3927 | dcid, scid, result, status); |
1da177e4 | 3928 | |
3df91ea2 AE |
3929 | mutex_lock(&conn->chan_lock); |
3930 | ||
1da177e4 | 3931 | if (scid) { |
3df91ea2 AE |
3932 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3933 | if (!chan) { | |
21870b52 | 3934 | err = -EBADSLT; |
3df91ea2 AE |
3935 | goto unlock; |
3936 | } | |
1da177e4 | 3937 | } else { |
3df91ea2 AE |
3938 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3939 | if (!chan) { | |
21870b52 | 3940 | err = -EBADSLT; |
3df91ea2 AE |
3941 | goto unlock; |
3942 | } | |
1da177e4 LT |
3943 | } |
3944 | ||
3df91ea2 AE |
3945 | err = 0; |
3946 | ||
6be36555 | 3947 | l2cap_chan_lock(chan); |
48454079 | 3948 | |
1da177e4 LT |
3949 | switch (result) { |
3950 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3951 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3952 | chan->ident = 0; |
fe4128e0 | 3953 | chan->dcid = dcid; |
c1360a1c | 3954 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3955 | |
c1360a1c | 3956 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3957 | break; |
3958 | ||
1da177e4 | 3959 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 3960 | l2cap_build_conf_req(chan, req), req); |
73ffa904 | 3961 | chan->num_conf_req++; |
1da177e4 LT |
3962 | break; |
3963 | ||
3964 | case L2CAP_CR_PEND: | |
c1360a1c | 3965 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3966 | break; |
3967 | ||
3968 | default: | |
48454079 | 3969 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3970 | break; |
3971 | } | |
3972 | ||
6be36555 | 3973 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3974 | |
3975 | unlock: | |
3976 | mutex_unlock(&conn->chan_lock); | |
3977 | ||
3978 | return err; | |
1da177e4 LT |
3979 | } |
3980 | ||
47d1ec61 | 3981 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3982 | { |
3983 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3984 | * sides request it. | |
3985 | */ | |
0c1bc5c6 | 3986 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3987 | chan->fcs = L2CAP_FCS_NONE; |
f2592d3e | 3988 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
47d1ec61 | 3989 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3990 | } |
3991 | ||
29d8a590 AE |
3992 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
3993 | u8 ident, u16 flags) | |
3994 | { | |
3995 | struct l2cap_conn *conn = chan->conn; | |
3996 | ||
3997 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident, | |
3998 | flags); | |
3999 | ||
4000 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
4001 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
4002 | ||
4003 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, | |
4004 | l2cap_build_conf_rsp(chan, data, | |
4005 | L2CAP_CONF_SUCCESS, flags), data); | |
4006 | } | |
4007 | ||
662d652d JH |
4008 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
4009 | u16 scid, u16 dcid) | |
4010 | { | |
4011 | struct l2cap_cmd_rej_cid rej; | |
4012 | ||
dcf4adbf | 4013 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); |
662d652d JH |
4014 | rej.scid = __cpu_to_le16(scid); |
4015 | rej.dcid = __cpu_to_le16(dcid); | |
4016 | ||
4017 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); | |
4018 | } | |
4019 | ||
2d792818 GP |
4020 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
4021 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
4022 | u8 *data) | |
1da177e4 LT |
4023 | { |
4024 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
4025 | u16 dcid, flags; | |
4026 | u8 rsp[64]; | |
48454079 | 4027 | struct l2cap_chan *chan; |
3c588192 | 4028 | int len, err = 0; |
1da177e4 | 4029 | |
cb3b3152 JH |
4030 | if (cmd_len < sizeof(*req)) |
4031 | return -EPROTO; | |
4032 | ||
1da177e4 LT |
4033 | dcid = __le16_to_cpu(req->dcid); |
4034 | flags = __le16_to_cpu(req->flags); | |
4035 | ||
4036 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
4037 | ||
baa7e1fa | 4038 | chan = l2cap_get_chan_by_scid(conn, dcid); |
662d652d JH |
4039 | if (!chan) { |
4040 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0); | |
4041 | return 0; | |
4042 | } | |
1da177e4 | 4043 | |
033b1142 | 4044 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
662d652d JH |
4045 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4046 | chan->dcid); | |
354f60a9 | 4047 | goto unlock; |
df6bd743 | 4048 | } |
354f60a9 | 4049 | |
5dee9e7c | 4050 | /* Reject if config buffer is too small. */ |
88219a0f | 4051 | len = cmd_len - sizeof(*req); |
cb3b3152 | 4052 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 4053 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2d792818 GP |
4054 | l2cap_build_conf_rsp(chan, rsp, |
4055 | L2CAP_CONF_REJECT, flags), rsp); | |
5dee9e7c MH |
4056 | goto unlock; |
4057 | } | |
4058 | ||
4059 | /* Store config. */ | |
73ffa904 GP |
4060 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4061 | chan->conf_len += len; | |
1da177e4 | 4062 | |
59e54bd1 | 4063 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
1da177e4 LT |
4064 | /* Incomplete config. Send empty response. */ |
4065 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2d792818 GP |
4066 | l2cap_build_conf_rsp(chan, rsp, |
4067 | L2CAP_CONF_SUCCESS, flags), rsp); | |
1da177e4 LT |
4068 | goto unlock; |
4069 | } | |
4070 | ||
4071 | /* Complete config. */ | |
73ffa904 | 4072 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 4073 | if (len < 0) { |
5e4e3972 | 4074 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 | 4075 | goto unlock; |
f2fcfcd6 | 4076 | } |
1da177e4 | 4077 | |
1500109b | 4078 | chan->ident = cmd->ident; |
5dee9e7c | 4079 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 4080 | chan->num_conf_rsp++; |
5dee9e7c | 4081 | |
5dee9e7c | 4082 | /* Reset config buffer. */ |
73ffa904 | 4083 | chan->conf_len = 0; |
5dee9e7c | 4084 | |
c1360a1c | 4085 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
4086 | goto unlock; |
4087 | ||
c1360a1c | 4088 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4089 | set_default_fcs(chan); |
fcc203c3 | 4090 | |
105bdf9e MM |
4091 | if (chan->mode == L2CAP_MODE_ERTM || |
4092 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
4093 | err = l2cap_ertm_init(chan); |
4094 | ||
4095 | if (err < 0) | |
5e4e3972 | 4096 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4097 | else |
4098 | l2cap_chan_ready(chan); | |
0565c1c2 | 4099 | |
876d9484 MH |
4100 | goto unlock; |
4101 | } | |
4102 | ||
c1360a1c | 4103 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 4104 | u8 buf[64]; |
1da177e4 | 4105 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2d792818 | 4106 | l2cap_build_conf_req(chan, buf), buf); |
73ffa904 | 4107 | chan->num_conf_req++; |
1da177e4 LT |
4108 | } |
4109 | ||
49c922bb | 4110 | /* Got Conf Rsp PENDING from remote side and assume we sent |
0e8b207e AE |
4111 | Conf Rsp PENDING in the code above */ |
4112 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
29d8a590 | 4113 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
0e8b207e AE |
4114 | |
4115 | /* check compatibility */ | |
4116 | ||
79de886d | 4117 | /* Send rsp for BR/EDR channel */ |
f351bc72 | 4118 | if (!chan->hs_hcon) |
79de886d AE |
4119 | l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags); |
4120 | else | |
4121 | chan->ident = cmd->ident; | |
0e8b207e AE |
4122 | } |
4123 | ||
1da177e4 | 4124 | unlock: |
6be36555 | 4125 | l2cap_chan_unlock(chan); |
3c588192 | 4126 | return err; |
1da177e4 LT |
4127 | } |
4128 | ||
2d792818 | 4129 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4130 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4131 | u8 *data) | |
1da177e4 LT |
4132 | { |
4133 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
4134 | u16 scid, flags, result; | |
48454079 | 4135 | struct l2cap_chan *chan; |
cb3b3152 | 4136 | int len = cmd_len - sizeof(*rsp); |
3c588192 | 4137 | int err = 0; |
1da177e4 | 4138 | |
cb3b3152 JH |
4139 | if (cmd_len < sizeof(*rsp)) |
4140 | return -EPROTO; | |
4141 | ||
1da177e4 LT |
4142 | scid = __le16_to_cpu(rsp->scid); |
4143 | flags = __le16_to_cpu(rsp->flags); | |
4144 | result = __le16_to_cpu(rsp->result); | |
4145 | ||
61386cba AE |
4146 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
4147 | result, len); | |
1da177e4 | 4148 | |
baa7e1fa | 4149 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 4150 | if (!chan) |
1da177e4 LT |
4151 | return 0; |
4152 | ||
4153 | switch (result) { | |
4154 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 4155 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 4156 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
4157 | break; |
4158 | ||
0e8b207e AE |
4159 | case L2CAP_CONF_PENDING: |
4160 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
4161 | ||
4162 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
4163 | char buf[64]; | |
4164 | ||
4165 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
2d792818 | 4166 | buf, &result); |
0e8b207e | 4167 | if (len < 0) { |
5e4e3972 | 4168 | l2cap_send_disconn_req(chan, ECONNRESET); |
0e8b207e AE |
4169 | goto done; |
4170 | } | |
4171 | ||
f351bc72 | 4172 | if (!chan->hs_hcon) { |
79de886d AE |
4173 | l2cap_send_efs_conf_rsp(chan, buf, cmd->ident, |
4174 | 0); | |
5ce66b59 AE |
4175 | } else { |
4176 | if (l2cap_check_efs(chan)) { | |
4177 | amp_create_logical_link(chan); | |
4178 | chan->ident = cmd->ident; | |
4179 | } | |
4180 | } | |
0e8b207e AE |
4181 | } |
4182 | goto done; | |
4183 | ||
1da177e4 | 4184 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 4185 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
4186 | char req[64]; |
4187 | ||
c2c77ec8 | 4188 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
5e4e3972 | 4189 | l2cap_send_disconn_req(chan, ECONNRESET); |
c2c77ec8 AE |
4190 | goto done; |
4191 | } | |
4192 | ||
f2fcfcd6 GP |
4193 | /* throw out any old stored conf requests */ |
4194 | result = L2CAP_CONF_SUCCESS; | |
b4450035 | 4195 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2d792818 | 4196 | req, &result); |
f2fcfcd6 | 4197 | if (len < 0) { |
5e4e3972 | 4198 | l2cap_send_disconn_req(chan, ECONNRESET); |
f2fcfcd6 GP |
4199 | goto done; |
4200 | } | |
4201 | ||
4202 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2d792818 | 4203 | L2CAP_CONF_REQ, len, req); |
73ffa904 | 4204 | chan->num_conf_req++; |
f2fcfcd6 GP |
4205 | if (result != L2CAP_CONF_SUCCESS) |
4206 | goto done; | |
4207 | break; | |
1da177e4 LT |
4208 | } |
4209 | ||
8e87d142 | 4210 | default: |
6be36555 | 4211 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 4212 | |
ba13ccd9 | 4213 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
5e4e3972 | 4214 | l2cap_send_disconn_req(chan, ECONNRESET); |
1da177e4 LT |
4215 | goto done; |
4216 | } | |
4217 | ||
59e54bd1 | 4218 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
1da177e4 LT |
4219 | goto done; |
4220 | ||
c1360a1c | 4221 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 4222 | |
c1360a1c | 4223 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 4224 | set_default_fcs(chan); |
fcc203c3 | 4225 | |
105bdf9e MM |
4226 | if (chan->mode == L2CAP_MODE_ERTM || |
4227 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 4228 | err = l2cap_ertm_init(chan); |
0565c1c2 | 4229 | |
3c588192 | 4230 | if (err < 0) |
5e4e3972 | 4231 | l2cap_send_disconn_req(chan, -err); |
3c588192 MM |
4232 | else |
4233 | l2cap_chan_ready(chan); | |
1da177e4 LT |
4234 | } |
4235 | ||
4236 | done: | |
6be36555 | 4237 | l2cap_chan_unlock(chan); |
3c588192 | 4238 | return err; |
1da177e4 LT |
4239 | } |
4240 | ||
2d792818 | 4241 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4242 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4243 | u8 *data) | |
1da177e4 LT |
4244 | { |
4245 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
4246 | struct l2cap_disconn_rsp rsp; | |
4247 | u16 dcid, scid; | |
48454079 | 4248 | struct l2cap_chan *chan; |
1da177e4 | 4249 | |
cb3b3152 JH |
4250 | if (cmd_len != sizeof(*req)) |
4251 | return -EPROTO; | |
4252 | ||
1da177e4 LT |
4253 | scid = __le16_to_cpu(req->scid); |
4254 | dcid = __le16_to_cpu(req->dcid); | |
4255 | ||
4256 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
4257 | ||
3df91ea2 AE |
4258 | mutex_lock(&conn->chan_lock); |
4259 | ||
4260 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
4261 | if (!chan) { | |
4262 | mutex_unlock(&conn->chan_lock); | |
662d652d JH |
4263 | cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid); |
4264 | return 0; | |
3df91ea2 | 4265 | } |
1da177e4 | 4266 | |
6be36555 AE |
4267 | l2cap_chan_lock(chan); |
4268 | ||
fe4128e0 GP |
4269 | rsp.dcid = cpu_to_le16(chan->scid); |
4270 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
4271 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
4272 | ||
5ec1bbe5 | 4273 | chan->ops->set_shutdown(chan); |
1da177e4 | 4274 | |
61d6ef3e | 4275 | l2cap_chan_hold(chan); |
48454079 | 4276 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
4277 | |
4278 | l2cap_chan_unlock(chan); | |
1da177e4 | 4279 | |
80b98027 | 4280 | chan->ops->close(chan); |
61d6ef3e | 4281 | l2cap_chan_put(chan); |
3df91ea2 AE |
4282 | |
4283 | mutex_unlock(&conn->chan_lock); | |
4284 | ||
1da177e4 LT |
4285 | return 0; |
4286 | } | |
4287 | ||
2d792818 | 4288 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4289 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4290 | u8 *data) | |
1da177e4 LT |
4291 | { |
4292 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
4293 | u16 dcid, scid; | |
48454079 | 4294 | struct l2cap_chan *chan; |
1da177e4 | 4295 | |
cb3b3152 JH |
4296 | if (cmd_len != sizeof(*rsp)) |
4297 | return -EPROTO; | |
4298 | ||
1da177e4 LT |
4299 | scid = __le16_to_cpu(rsp->scid); |
4300 | dcid = __le16_to_cpu(rsp->dcid); | |
4301 | ||
4302 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
4303 | ||
3df91ea2 AE |
4304 | mutex_lock(&conn->chan_lock); |
4305 | ||
4306 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
4307 | if (!chan) { | |
4308 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 4309 | return 0; |
3df91ea2 | 4310 | } |
1da177e4 | 4311 | |
6be36555 | 4312 | l2cap_chan_lock(chan); |
48454079 | 4313 | |
61d6ef3e | 4314 | l2cap_chan_hold(chan); |
48454079 | 4315 | l2cap_chan_del(chan, 0); |
6be36555 AE |
4316 | |
4317 | l2cap_chan_unlock(chan); | |
1da177e4 | 4318 | |
80b98027 | 4319 | chan->ops->close(chan); |
61d6ef3e | 4320 | l2cap_chan_put(chan); |
3df91ea2 AE |
4321 | |
4322 | mutex_unlock(&conn->chan_lock); | |
4323 | ||
1da177e4 LT |
4324 | return 0; |
4325 | } | |
4326 | ||
2d792818 | 4327 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
cb3b3152 JH |
4328 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4329 | u8 *data) | |
1da177e4 LT |
4330 | { |
4331 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
4332 | u16 type; |
4333 | ||
cb3b3152 JH |
4334 | if (cmd_len != sizeof(*req)) |
4335 | return -EPROTO; | |
4336 | ||
1da177e4 LT |
4337 | type = __le16_to_cpu(req->type); |
4338 | ||
4339 | BT_DBG("type 0x%4.4x", type); | |
4340 | ||
f0709e03 MH |
4341 | if (type == L2CAP_IT_FEAT_MASK) { |
4342 | u8 buf[8]; | |
44dd46de | 4343 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 | 4344 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
dcf4adbf JP |
4345 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4346 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 4347 | if (!disable_ertm) |
fcc203c3 | 4348 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2d792818 | 4349 | | L2CAP_FEAT_FCS; |
0bd49fc7 | 4350 | if (conn->local_fixed_chan & L2CAP_FC_A2MP) |
6327eb98 | 4351 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
2d792818 | 4352 | | L2CAP_FEAT_EXT_WINDOW; |
a5fd6f30 | 4353 | |
1b7bf4ed | 4354 | put_unaligned_le32(feat_mask, rsp->data); |
2d792818 GP |
4355 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4356 | buf); | |
e1027a7c MH |
4357 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4358 | u8 buf[12]; | |
4359 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd | 4360 | |
dcf4adbf JP |
4361 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4362 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
0bd49fc7 JH |
4363 | rsp->data[0] = conn->local_fixed_chan; |
4364 | memset(rsp->data + 1, 0, 7); | |
2d792818 GP |
4365 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf), |
4366 | buf); | |
f0709e03 MH |
4367 | } else { |
4368 | struct l2cap_info_rsp rsp; | |
4369 | rsp.type = cpu_to_le16(type); | |
dcf4adbf | 4370 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); |
2d792818 GP |
4371 | l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), |
4372 | &rsp); | |
f0709e03 | 4373 | } |
1da177e4 LT |
4374 | |
4375 | return 0; | |
4376 | } | |
4377 | ||
2d792818 | 4378 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
cb3b3152 JH |
4379 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4380 | u8 *data) | |
1da177e4 LT |
4381 | { |
4382 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
4383 | u16 type, result; | |
4384 | ||
3f6fa3d4 | 4385 | if (cmd_len < sizeof(*rsp)) |
cb3b3152 JH |
4386 | return -EPROTO; |
4387 | ||
1da177e4 LT |
4388 | type = __le16_to_cpu(rsp->type); |
4389 | result = __le16_to_cpu(rsp->result); | |
4390 | ||
4391 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
4392 | ||
e90165be AE |
4393 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4394 | if (cmd->ident != conn->info_ident || | |
2d792818 | 4395 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
e90165be AE |
4396 | return 0; |
4397 | ||
17cd3f37 | 4398 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 4399 | |
adb08ede VT |
4400 | if (result != L2CAP_IR_SUCCESS) { |
4401 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4402 | conn->info_ident = 0; | |
4403 | ||
4404 | l2cap_conn_start(conn); | |
4405 | ||
4406 | return 0; | |
4407 | } | |
4408 | ||
978c93b9 AE |
4409 | switch (type) { |
4410 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 4411 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 4412 | |
47ec1dcd | 4413 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c | 4414 | struct l2cap_info_req req; |
dcf4adbf | 4415 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
e1027a7c MH |
4416 | |
4417 | conn->info_ident = l2cap_get_ident(conn); | |
4418 | ||
4419 | l2cap_send_cmd(conn, conn->info_ident, | |
2d792818 | 4420 | L2CAP_INFO_REQ, sizeof(req), &req); |
e1027a7c MH |
4421 | } else { |
4422 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
4423 | conn->info_ident = 0; | |
4424 | ||
4425 | l2cap_conn_start(conn); | |
4426 | } | |
978c93b9 AE |
4427 | break; |
4428 | ||
4429 | case L2CAP_IT_FIXED_CHAN: | |
0bd49fc7 | 4430 | conn->remote_fixed_chan = rsp->data[0]; |
984947dc | 4431 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 4432 | conn->info_ident = 0; |
984947dc MH |
4433 | |
4434 | l2cap_conn_start(conn); | |
978c93b9 | 4435 | break; |
984947dc | 4436 | } |
4e8402a3 | 4437 | |
1da177e4 LT |
4438 | return 0; |
4439 | } | |
4440 | ||
1700915f MM |
4441 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4442 | struct l2cap_cmd_hdr *cmd, | |
4443 | u16 cmd_len, void *data) | |
f94ff6ff MM |
4444 | { |
4445 | struct l2cap_create_chan_req *req = data; | |
6e1df6a6 | 4446 | struct l2cap_create_chan_rsp rsp; |
1700915f | 4447 | struct l2cap_chan *chan; |
6e1df6a6 | 4448 | struct hci_dev *hdev; |
f94ff6ff MM |
4449 | u16 psm, scid; |
4450 | ||
4451 | if (cmd_len != sizeof(*req)) | |
4452 | return -EPROTO; | |
4453 | ||
0bd49fc7 | 4454 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
f94ff6ff MM |
4455 | return -EINVAL; |
4456 | ||
4457 | psm = le16_to_cpu(req->psm); | |
4458 | scid = le16_to_cpu(req->scid); | |
4459 | ||
ad0ac6ca | 4460 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id); |
f94ff6ff | 4461 | |
6e1df6a6 | 4462 | /* For controller id 0 make BR/EDR connection */ |
6ed971ca | 4463 | if (req->amp_id == AMP_ID_BREDR) { |
6e1df6a6 AE |
4464 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4465 | req->amp_id); | |
4466 | return 0; | |
4467 | } | |
1700915f | 4468 | |
6e1df6a6 AE |
4469 | /* Validate AMP controller id */ |
4470 | hdev = hci_dev_get(req->amp_id); | |
4471 | if (!hdev) | |
4472 | goto error; | |
1700915f | 4473 | |
6e1df6a6 AE |
4474 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4475 | hci_dev_put(hdev); | |
4476 | goto error; | |
4477 | } | |
1700915f | 4478 | |
6e1df6a6 AE |
4479 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4480 | req->amp_id); | |
4481 | if (chan) { | |
4482 | struct amp_mgr *mgr = conn->hcon->amp_mgr; | |
4483 | struct hci_conn *hs_hcon; | |
1700915f | 4484 | |
98e0f7ea MH |
4485 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4486 | &conn->hcon->dst); | |
6e1df6a6 AE |
4487 | if (!hs_hcon) { |
4488 | hci_dev_put(hdev); | |
662d652d JH |
4489 | cmd_reject_invalid_cid(conn, cmd->ident, chan->scid, |
4490 | chan->dcid); | |
4491 | return 0; | |
1700915f MM |
4492 | } |
4493 | ||
6e1df6a6 AE |
4494 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon); |
4495 | ||
6e1df6a6 AE |
4496 | mgr->bredr_chan = chan; |
4497 | chan->hs_hcon = hs_hcon; | |
fd45bf4c | 4498 | chan->fcs = L2CAP_FCS_NONE; |
6e1df6a6 | 4499 | conn->mtu = hdev->block_mtu; |
1700915f | 4500 | } |
f94ff6ff | 4501 | |
6e1df6a6 | 4502 | hci_dev_put(hdev); |
f94ff6ff MM |
4503 | |
4504 | return 0; | |
6e1df6a6 AE |
4505 | |
4506 | error: | |
4507 | rsp.dcid = 0; | |
4508 | rsp.scid = cpu_to_le16(scid); | |
dcf4adbf JP |
4509 | rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); |
4510 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
6e1df6a6 AE |
4511 | |
4512 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
4513 | sizeof(rsp), &rsp); | |
4514 | ||
dc280801 | 4515 | return 0; |
f94ff6ff MM |
4516 | } |
4517 | ||
8eb200bd MM |
4518 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4519 | { | |
4520 | struct l2cap_move_chan_req req; | |
4521 | u8 ident; | |
4522 | ||
4523 | BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id); | |
4524 | ||
4525 | ident = l2cap_get_ident(chan->conn); | |
4526 | chan->ident = ident; | |
4527 | ||
4528 | req.icid = cpu_to_le16(chan->scid); | |
4529 | req.dest_amp_id = dest_amp_id; | |
4530 | ||
4531 | l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req), | |
4532 | &req); | |
4533 | ||
4534 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4535 | } | |
4536 | ||
1500109b | 4537 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4538 | { |
4539 | struct l2cap_move_chan_rsp rsp; | |
4540 | ||
1500109b | 4541 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4542 | |
1500109b | 4543 | rsp.icid = cpu_to_le16(chan->dcid); |
8d5a04a1 MM |
4544 | rsp.result = cpu_to_le16(result); |
4545 | ||
1500109b MM |
4546 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP, |
4547 | sizeof(rsp), &rsp); | |
8d5a04a1 MM |
4548 | } |
4549 | ||
5b155ef9 | 4550 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
8d5a04a1 MM |
4551 | { |
4552 | struct l2cap_move_chan_cfm cfm; | |
8d5a04a1 | 4553 | |
5b155ef9 | 4554 | BT_DBG("chan %p, result 0x%4.4x", chan, result); |
8d5a04a1 | 4555 | |
5b155ef9 | 4556 | chan->ident = l2cap_get_ident(chan->conn); |
8d5a04a1 | 4557 | |
5b155ef9 | 4558 | cfm.icid = cpu_to_le16(chan->scid); |
8d5a04a1 MM |
4559 | cfm.result = cpu_to_le16(result); |
4560 | ||
5b155ef9 MM |
4561 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM, |
4562 | sizeof(cfm), &cfm); | |
4563 | ||
4564 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); | |
4565 | } | |
4566 | ||
4567 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) | |
4568 | { | |
4569 | struct l2cap_move_chan_cfm cfm; | |
4570 | ||
4571 | BT_DBG("conn %p, icid 0x%4.4x", conn, icid); | |
4572 | ||
4573 | cfm.icid = cpu_to_le16(icid); | |
dcf4adbf | 4574 | cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); |
5b155ef9 MM |
4575 | |
4576 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, | |
4577 | sizeof(cfm), &cfm); | |
8d5a04a1 MM |
4578 | } |
4579 | ||
4580 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
ad0ac6ca | 4581 | u16 icid) |
8d5a04a1 MM |
4582 | { |
4583 | struct l2cap_move_chan_cfm_rsp rsp; | |
4584 | ||
ad0ac6ca | 4585 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 MM |
4586 | |
4587 | rsp.icid = cpu_to_le16(icid); | |
4588 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
4589 | } | |
4590 | ||
5f3847a4 MM |
4591 | static void __release_logical_link(struct l2cap_chan *chan) |
4592 | { | |
4593 | chan->hs_hchan = NULL; | |
4594 | chan->hs_hcon = NULL; | |
4595 | ||
4596 | /* Placeholder - release the logical link */ | |
4597 | } | |
4598 | ||
1500109b MM |
4599 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
4600 | { | |
4601 | /* Logical link setup failed */ | |
4602 | if (chan->state != BT_CONNECTED) { | |
4603 | /* Create channel failure, disconnect */ | |
5e4e3972 | 4604 | l2cap_send_disconn_req(chan, ECONNRESET); |
1500109b MM |
4605 | return; |
4606 | } | |
4607 | ||
4608 | switch (chan->move_role) { | |
4609 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4610 | l2cap_move_done(chan); | |
4611 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); | |
4612 | break; | |
4613 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4614 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || | |
4615 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { | |
4616 | /* Remote has only sent pending or | |
4617 | * success responses, clean up | |
4618 | */ | |
4619 | l2cap_move_done(chan); | |
4620 | } | |
4621 | ||
4622 | /* Other amp move states imply that the move | |
4623 | * has already aborted | |
4624 | */ | |
4625 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
4626 | break; | |
4627 | } | |
4628 | } | |
4629 | ||
4630 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, | |
4631 | struct hci_chan *hchan) | |
4632 | { | |
4633 | struct l2cap_conf_rsp rsp; | |
1500109b | 4634 | |
336178a3 | 4635 | chan->hs_hchan = hchan; |
1500109b MM |
4636 | chan->hs_hcon->l2cap_data = chan->conn; |
4637 | ||
35ba9561 | 4638 | l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0); |
1500109b MM |
4639 | |
4640 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { | |
fe79c6fe | 4641 | int err; |
1500109b MM |
4642 | |
4643 | set_default_fcs(chan); | |
4644 | ||
4645 | err = l2cap_ertm_init(chan); | |
4646 | if (err < 0) | |
5e4e3972 | 4647 | l2cap_send_disconn_req(chan, -err); |
1500109b MM |
4648 | else |
4649 | l2cap_chan_ready(chan); | |
4650 | } | |
4651 | } | |
4652 | ||
4653 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, | |
4654 | struct hci_chan *hchan) | |
4655 | { | |
4656 | chan->hs_hcon = hchan->conn; | |
4657 | chan->hs_hcon->l2cap_data = chan->conn; | |
4658 | ||
4659 | BT_DBG("move_state %d", chan->move_state); | |
4660 | ||
4661 | switch (chan->move_state) { | |
4662 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4663 | /* Move confirm will be sent after a success | |
4664 | * response is received | |
4665 | */ | |
4666 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4667 | break; | |
4668 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: | |
4669 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4670 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4671 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
4672 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4673 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4674 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4675 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4676 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4677 | } | |
4678 | break; | |
4679 | default: | |
4680 | /* Move was not in expected state, free the channel */ | |
4681 | __release_logical_link(chan); | |
4682 | ||
4683 | chan->move_state = L2CAP_MOVE_STABLE; | |
4684 | } | |
4685 | } | |
4686 | ||
4687 | /* Call with chan locked */ | |
27695fb4 AE |
4688 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
4689 | u8 status) | |
5b155ef9 | 4690 | { |
1500109b MM |
4691 | BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status); |
4692 | ||
4693 | if (status) { | |
4694 | l2cap_logical_fail(chan); | |
4695 | __release_logical_link(chan); | |
4696 | return; | |
4697 | } | |
4698 | ||
4699 | if (chan->state != BT_CONNECTED) { | |
4700 | /* Ignore logical link if channel is on BR/EDR */ | |
6ed971ca | 4701 | if (chan->local_amp_id != AMP_ID_BREDR) |
1500109b MM |
4702 | l2cap_logical_finish_create(chan, hchan); |
4703 | } else { | |
4704 | l2cap_logical_finish_move(chan, hchan); | |
4705 | } | |
5b155ef9 MM |
4706 | } |
4707 | ||
3f7a56c4 MM |
4708 | void l2cap_move_start(struct l2cap_chan *chan) |
4709 | { | |
4710 | BT_DBG("chan %p", chan); | |
4711 | ||
6ed971ca | 4712 | if (chan->local_amp_id == AMP_ID_BREDR) { |
3f7a56c4 MM |
4713 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
4714 | return; | |
4715 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4716 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4717 | /* Placeholder - start physical link setup */ | |
4718 | } else { | |
4719 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; | |
4720 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
4721 | chan->move_id = 0; | |
4722 | l2cap_move_setup(chan); | |
4723 | l2cap_send_move_chan_req(chan, 0); | |
4724 | } | |
4725 | } | |
4726 | ||
8eb200bd MM |
4727 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
4728 | u8 local_amp_id, u8 remote_amp_id) | |
4729 | { | |
62748ca1 AE |
4730 | BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state), |
4731 | local_amp_id, remote_amp_id); | |
4732 | ||
12d6cc60 AE |
4733 | chan->fcs = L2CAP_FCS_NONE; |
4734 | ||
62748ca1 AE |
4735 | /* Outgoing channel on AMP */ |
4736 | if (chan->state == BT_CONNECT) { | |
4737 | if (result == L2CAP_CR_SUCCESS) { | |
4738 | chan->local_amp_id = local_amp_id; | |
4739 | l2cap_send_create_chan_req(chan, remote_amp_id); | |
4740 | } else { | |
4741 | /* Revert to BR/EDR connect */ | |
4742 | l2cap_send_conn_req(chan); | |
4743 | } | |
4744 | ||
4745 | return; | |
4746 | } | |
4747 | ||
4748 | /* Incoming channel on AMP */ | |
4749 | if (__l2cap_no_conn_pending(chan)) { | |
8eb200bd MM |
4750 | struct l2cap_conn_rsp rsp; |
4751 | char buf[128]; | |
4752 | rsp.scid = cpu_to_le16(chan->dcid); | |
4753 | rsp.dcid = cpu_to_le16(chan->scid); | |
4754 | ||
8eb200bd MM |
4755 | if (result == L2CAP_CR_SUCCESS) { |
4756 | /* Send successful response */ | |
dcf4adbf JP |
4757 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
4758 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4759 | } else { |
4760 | /* Send negative response */ | |
dcf4adbf JP |
4761 | rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); |
4762 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
8eb200bd MM |
4763 | } |
4764 | ||
4765 | l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP, | |
4766 | sizeof(rsp), &rsp); | |
4767 | ||
4768 | if (result == L2CAP_CR_SUCCESS) { | |
f93fa273 | 4769 | l2cap_state_change(chan, BT_CONFIG); |
8eb200bd MM |
4770 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
4771 | l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn), | |
4772 | L2CAP_CONF_REQ, | |
4773 | l2cap_build_conf_req(chan, buf), buf); | |
4774 | chan->num_conf_req++; | |
4775 | } | |
8eb200bd MM |
4776 | } |
4777 | } | |
4778 | ||
4779 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, | |
4780 | u8 remote_amp_id) | |
4781 | { | |
4782 | l2cap_move_setup(chan); | |
4783 | chan->move_id = local_amp_id; | |
4784 | chan->move_state = L2CAP_MOVE_WAIT_RSP; | |
4785 | ||
4786 | l2cap_send_move_chan_req(chan, remote_amp_id); | |
4787 | } | |
4788 | ||
4789 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) | |
4790 | { | |
4791 | struct hci_chan *hchan = NULL; | |
4792 | ||
4793 | /* Placeholder - get hci_chan for logical link */ | |
4794 | ||
4795 | if (hchan) { | |
4796 | if (hchan->state == BT_CONNECTED) { | |
4797 | /* Logical link is ready to go */ | |
4798 | chan->hs_hcon = hchan->conn; | |
4799 | chan->hs_hcon->l2cap_data = chan->conn; | |
4800 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4801 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); | |
4802 | ||
4803 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
4804 | } else { | |
4805 | /* Wait for logical link to be ready */ | |
4806 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4807 | } | |
4808 | } else { | |
4809 | /* Logical link not available */ | |
4810 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); | |
4811 | } | |
4812 | } | |
4813 | ||
4814 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) | |
4815 | { | |
4816 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { | |
4817 | u8 rsp_result; | |
4818 | if (result == -EINVAL) | |
4819 | rsp_result = L2CAP_MR_BAD_ID; | |
4820 | else | |
4821 | rsp_result = L2CAP_MR_NOT_ALLOWED; | |
4822 | ||
4823 | l2cap_send_move_chan_rsp(chan, rsp_result); | |
4824 | } | |
4825 | ||
4826 | chan->move_role = L2CAP_MOVE_ROLE_NONE; | |
4827 | chan->move_state = L2CAP_MOVE_STABLE; | |
4828 | ||
4829 | /* Restart data transmission */ | |
4830 | l2cap_ertm_send(chan); | |
4831 | } | |
4832 | ||
a514b17f AE |
4833 | /* Invoke with locked chan */ |
4834 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) | |
8eb200bd | 4835 | { |
770bfefa | 4836 | u8 local_amp_id = chan->local_amp_id; |
fffadc08 | 4837 | u8 remote_amp_id = chan->remote_amp_id; |
770bfefa | 4838 | |
8eb200bd MM |
4839 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d", |
4840 | chan, result, local_amp_id, remote_amp_id); | |
4841 | ||
8eb200bd MM |
4842 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) { |
4843 | l2cap_chan_unlock(chan); | |
4844 | return; | |
4845 | } | |
4846 | ||
4847 | if (chan->state != BT_CONNECTED) { | |
4848 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); | |
4849 | } else if (result != L2CAP_MR_SUCCESS) { | |
4850 | l2cap_do_move_cancel(chan, result); | |
4851 | } else { | |
4852 | switch (chan->move_role) { | |
4853 | case L2CAP_MOVE_ROLE_INITIATOR: | |
4854 | l2cap_do_move_initiate(chan, local_amp_id, | |
4855 | remote_amp_id); | |
4856 | break; | |
4857 | case L2CAP_MOVE_ROLE_RESPONDER: | |
4858 | l2cap_do_move_respond(chan, result); | |
4859 | break; | |
4860 | default: | |
4861 | l2cap_do_move_cancel(chan, result); | |
4862 | break; | |
4863 | } | |
4864 | } | |
8eb200bd MM |
4865 | } |
4866 | ||
8d5a04a1 | 4867 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
ad0ac6ca AE |
4868 | struct l2cap_cmd_hdr *cmd, |
4869 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
4870 | { |
4871 | struct l2cap_move_chan_req *req = data; | |
1500109b | 4872 | struct l2cap_move_chan_rsp rsp; |
02b0fbb9 | 4873 | struct l2cap_chan *chan; |
8d5a04a1 MM |
4874 | u16 icid = 0; |
4875 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
4876 | ||
4877 | if (cmd_len != sizeof(*req)) | |
4878 | return -EPROTO; | |
4879 | ||
4880 | icid = le16_to_cpu(req->icid); | |
4881 | ||
ad0ac6ca | 4882 | BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id); |
8d5a04a1 | 4883 | |
0bd49fc7 | 4884 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
8d5a04a1 MM |
4885 | return -EINVAL; |
4886 | ||
02b0fbb9 MM |
4887 | chan = l2cap_get_chan_by_dcid(conn, icid); |
4888 | if (!chan) { | |
1500109b | 4889 | rsp.icid = cpu_to_le16(icid); |
dcf4adbf | 4890 | rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); |
1500109b MM |
4891 | l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP, |
4892 | sizeof(rsp), &rsp); | |
02b0fbb9 MM |
4893 | return 0; |
4894 | } | |
4895 | ||
1500109b MM |
4896 | chan->ident = cmd->ident; |
4897 | ||
02b0fbb9 MM |
4898 | if (chan->scid < L2CAP_CID_DYN_START || |
4899 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || | |
4900 | (chan->mode != L2CAP_MODE_ERTM && | |
4901 | chan->mode != L2CAP_MODE_STREAMING)) { | |
4902 | result = L2CAP_MR_NOT_ALLOWED; | |
4903 | goto send_move_response; | |
4904 | } | |
4905 | ||
4906 | if (chan->local_amp_id == req->dest_amp_id) { | |
4907 | result = L2CAP_MR_SAME_ID; | |
4908 | goto send_move_response; | |
4909 | } | |
4910 | ||
6ed971ca | 4911 | if (req->dest_amp_id != AMP_ID_BREDR) { |
02b0fbb9 MM |
4912 | struct hci_dev *hdev; |
4913 | hdev = hci_dev_get(req->dest_amp_id); | |
4914 | if (!hdev || hdev->dev_type != HCI_AMP || | |
4915 | !test_bit(HCI_UP, &hdev->flags)) { | |
4916 | if (hdev) | |
4917 | hci_dev_put(hdev); | |
4918 | ||
4919 | result = L2CAP_MR_BAD_ID; | |
4920 | goto send_move_response; | |
4921 | } | |
4922 | hci_dev_put(hdev); | |
4923 | } | |
4924 | ||
4925 | /* Detect a move collision. Only send a collision response | |
4926 | * if this side has "lost", otherwise proceed with the move. | |
4927 | * The winner has the larger bd_addr. | |
4928 | */ | |
4929 | if ((__chan_is_moving(chan) || | |
4930 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && | |
6f59b904 | 4931 | bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) { |
02b0fbb9 MM |
4932 | result = L2CAP_MR_COLLISION; |
4933 | goto send_move_response; | |
4934 | } | |
4935 | ||
02b0fbb9 MM |
4936 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
4937 | l2cap_move_setup(chan); | |
4938 | chan->move_id = req->dest_amp_id; | |
4939 | icid = chan->dcid; | |
4940 | ||
6ed971ca | 4941 | if (req->dest_amp_id == AMP_ID_BREDR) { |
02b0fbb9 MM |
4942 | /* Moving to BR/EDR */ |
4943 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4944 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4945 | result = L2CAP_MR_PEND; | |
4946 | } else { | |
4947 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; | |
4948 | result = L2CAP_MR_SUCCESS; | |
4949 | } | |
4950 | } else { | |
4951 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; | |
4952 | /* Placeholder - uncomment when amp functions are available */ | |
4953 | /*amp_accept_physical(chan, req->dest_amp_id);*/ | |
4954 | result = L2CAP_MR_PEND; | |
4955 | } | |
4956 | ||
4957 | send_move_response: | |
1500109b | 4958 | l2cap_send_move_chan_rsp(chan, result); |
8d5a04a1 | 4959 | |
02b0fbb9 MM |
4960 | l2cap_chan_unlock(chan); |
4961 | ||
8d5a04a1 MM |
4962 | return 0; |
4963 | } | |
4964 | ||
5b155ef9 MM |
4965 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
4966 | { | |
4967 | struct l2cap_chan *chan; | |
4968 | struct hci_chan *hchan = NULL; | |
4969 | ||
4970 | chan = l2cap_get_chan_by_scid(conn, icid); | |
4971 | if (!chan) { | |
4972 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
4973 | return; | |
4974 | } | |
4975 | ||
4976 | __clear_chan_timer(chan); | |
4977 | if (result == L2CAP_MR_PEND) | |
4978 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); | |
4979 | ||
4980 | switch (chan->move_state) { | |
4981 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: | |
4982 | /* Move confirm will be sent when logical link | |
4983 | * is complete. | |
4984 | */ | |
4985 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
4986 | break; | |
4987 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: | |
4988 | if (result == L2CAP_MR_PEND) { | |
4989 | break; | |
4990 | } else if (test_bit(CONN_LOCAL_BUSY, | |
4991 | &chan->conn_state)) { | |
4992 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; | |
4993 | } else { | |
4994 | /* Logical link is up or moving to BR/EDR, | |
4995 | * proceed with move | |
4996 | */ | |
4997 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; | |
4998 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
4999 | } | |
5000 | break; | |
5001 | case L2CAP_MOVE_WAIT_RSP: | |
5002 | /* Moving to AMP */ | |
5003 | if (result == L2CAP_MR_SUCCESS) { | |
5004 | /* Remote is ready, send confirm immediately | |
5005 | * after logical link is ready | |
5006 | */ | |
5007 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; | |
5008 | } else { | |
5009 | /* Both logical link and move success | |
5010 | * are required to confirm | |
5011 | */ | |
5012 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; | |
5013 | } | |
5014 | ||
5015 | /* Placeholder - get hci_chan for logical link */ | |
5016 | if (!hchan) { | |
5017 | /* Logical link not available */ | |
5018 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5019 | break; | |
5020 | } | |
5021 | ||
5022 | /* If the logical link is not yet connected, do not | |
5023 | * send confirmation. | |
5024 | */ | |
5025 | if (hchan->state != BT_CONNECTED) | |
5026 | break; | |
5027 | ||
5028 | /* Logical link is already ready to go */ | |
5029 | ||
5030 | chan->hs_hcon = hchan->conn; | |
5031 | chan->hs_hcon->l2cap_data = chan->conn; | |
5032 | ||
5033 | if (result == L2CAP_MR_SUCCESS) { | |
5034 | /* Can confirm now */ | |
5035 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); | |
5036 | } else { | |
5037 | /* Now only need move success | |
5038 | * to confirm | |
5039 | */ | |
5040 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; | |
5041 | } | |
5042 | ||
5043 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); | |
5044 | break; | |
5045 | default: | |
5046 | /* Any other amp move state means the move failed. */ | |
5047 | chan->move_id = chan->local_amp_id; | |
5048 | l2cap_move_done(chan); | |
5049 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5050 | } | |
5051 | ||
5052 | l2cap_chan_unlock(chan); | |
5053 | } | |
5054 | ||
5055 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, | |
5056 | u16 result) | |
5057 | { | |
5058 | struct l2cap_chan *chan; | |
5059 | ||
5060 | chan = l2cap_get_chan_by_ident(conn, ident); | |
5061 | if (!chan) { | |
5062 | /* Could not locate channel, icid is best guess */ | |
5063 | l2cap_send_move_chan_cfm_icid(conn, icid); | |
5064 | return; | |
5065 | } | |
5066 | ||
5067 | __clear_chan_timer(chan); | |
5068 | ||
5069 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { | |
5070 | if (result == L2CAP_MR_COLLISION) { | |
5071 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; | |
5072 | } else { | |
5073 | /* Cleanup - cancel move */ | |
5074 | chan->move_id = chan->local_amp_id; | |
5075 | l2cap_move_done(chan); | |
5076 | } | |
5077 | } | |
5078 | ||
5079 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); | |
5080 | ||
5081 | l2cap_chan_unlock(chan); | |
5082 | } | |
5083 | ||
5084 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
5085 | struct l2cap_cmd_hdr *cmd, | |
5086 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5087 | { |
5088 | struct l2cap_move_chan_rsp *rsp = data; | |
5089 | u16 icid, result; | |
5090 | ||
5091 | if (cmd_len != sizeof(*rsp)) | |
5092 | return -EPROTO; | |
5093 | ||
5094 | icid = le16_to_cpu(rsp->icid); | |
5095 | result = le16_to_cpu(rsp->result); | |
5096 | ||
ad0ac6ca | 5097 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5098 | |
5b155ef9 MM |
5099 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5100 | l2cap_move_continue(conn, icid, result); | |
5101 | else | |
5102 | l2cap_move_fail(conn, cmd->ident, icid, result); | |
8d5a04a1 MM |
5103 | |
5104 | return 0; | |
5105 | } | |
5106 | ||
5f3847a4 MM |
5107 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5108 | struct l2cap_cmd_hdr *cmd, | |
5109 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5110 | { |
5111 | struct l2cap_move_chan_cfm *cfm = data; | |
5f3847a4 | 5112 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5113 | u16 icid, result; |
5114 | ||
5115 | if (cmd_len != sizeof(*cfm)) | |
5116 | return -EPROTO; | |
5117 | ||
5118 | icid = le16_to_cpu(cfm->icid); | |
5119 | result = le16_to_cpu(cfm->result); | |
5120 | ||
ad0ac6ca | 5121 | BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result); |
8d5a04a1 | 5122 | |
5f3847a4 MM |
5123 | chan = l2cap_get_chan_by_dcid(conn, icid); |
5124 | if (!chan) { | |
5125 | /* Spec requires a response even if the icid was not found */ | |
5126 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
5127 | return 0; | |
5128 | } | |
5129 | ||
5130 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { | |
5131 | if (result == L2CAP_MC_CONFIRMED) { | |
5132 | chan->local_amp_id = chan->move_id; | |
6ed971ca | 5133 | if (chan->local_amp_id == AMP_ID_BREDR) |
5f3847a4 MM |
5134 | __release_logical_link(chan); |
5135 | } else { | |
5136 | chan->move_id = chan->local_amp_id; | |
5137 | } | |
5138 | ||
5139 | l2cap_move_done(chan); | |
5140 | } | |
5141 | ||
8d5a04a1 MM |
5142 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); |
5143 | ||
5f3847a4 MM |
5144 | l2cap_chan_unlock(chan); |
5145 | ||
8d5a04a1 MM |
5146 | return 0; |
5147 | } | |
5148 | ||
5149 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
ad0ac6ca AE |
5150 | struct l2cap_cmd_hdr *cmd, |
5151 | u16 cmd_len, void *data) | |
8d5a04a1 MM |
5152 | { |
5153 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3fd71a0a | 5154 | struct l2cap_chan *chan; |
8d5a04a1 MM |
5155 | u16 icid; |
5156 | ||
5157 | if (cmd_len != sizeof(*rsp)) | |
5158 | return -EPROTO; | |
5159 | ||
5160 | icid = le16_to_cpu(rsp->icid); | |
5161 | ||
ad0ac6ca | 5162 | BT_DBG("icid 0x%4.4x", icid); |
8d5a04a1 | 5163 | |
3fd71a0a MM |
5164 | chan = l2cap_get_chan_by_scid(conn, icid); |
5165 | if (!chan) | |
5166 | return 0; | |
5167 | ||
5168 | __clear_chan_timer(chan); | |
5169 | ||
5170 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { | |
5171 | chan->local_amp_id = chan->move_id; | |
5172 | ||
6ed971ca | 5173 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
3fd71a0a MM |
5174 | __release_logical_link(chan); |
5175 | ||
5176 | l2cap_move_done(chan); | |
5177 | } | |
5178 | ||
5179 | l2cap_chan_unlock(chan); | |
5180 | ||
8d5a04a1 MM |
5181 | return 0; |
5182 | } | |
5183 | ||
de73115a | 5184 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, |
2d792818 | 5185 | struct l2cap_cmd_hdr *cmd, |
203e639e | 5186 | u16 cmd_len, u8 *data) |
de73115a CT |
5187 | { |
5188 | struct hci_conn *hcon = conn->hcon; | |
5189 | struct l2cap_conn_param_update_req *req; | |
5190 | struct l2cap_conn_param_update_rsp rsp; | |
203e639e | 5191 | u16 min, max, latency, to_multiplier; |
2ce603eb | 5192 | int err; |
de73115a | 5193 | |
40bef302 | 5194 | if (hcon->role != HCI_ROLE_MASTER) |
de73115a CT |
5195 | return -EINVAL; |
5196 | ||
de73115a CT |
5197 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5198 | return -EPROTO; | |
5199 | ||
5200 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
5201 | min = __le16_to_cpu(req->min); |
5202 | max = __le16_to_cpu(req->max); | |
de73115a CT |
5203 | latency = __le16_to_cpu(req->latency); |
5204 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
5205 | ||
5206 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2d792818 | 5207 | min, max, latency, to_multiplier); |
de73115a CT |
5208 | |
5209 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb | 5210 | |
d4905f24 | 5211 | err = hci_check_conn_params(min, max, latency, to_multiplier); |
2ce603eb | 5212 | if (err) |
dcf4adbf | 5213 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
de73115a | 5214 | else |
dcf4adbf | 5215 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
de73115a CT |
5216 | |
5217 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2d792818 | 5218 | sizeof(rsp), &rsp); |
de73115a | 5219 | |
ffb5a827 | 5220 | if (!err) { |
f4869e2a JH |
5221 | u8 store_hint; |
5222 | ||
5223 | store_hint = hci_le_conn_update(hcon, min, max, latency, | |
5224 | to_multiplier); | |
ffb5a827 | 5225 | mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type, |
f4869e2a JH |
5226 | store_hint, min, max, latency, |
5227 | to_multiplier); | |
ffb5a827 | 5228 | |
ffb5a827 | 5229 | } |
2ce603eb | 5230 | |
de73115a CT |
5231 | return 0; |
5232 | } | |
5233 | ||
f1496dee JH |
5234 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5235 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5236 | u8 *data) | |
5237 | { | |
5238 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; | |
3e64b7bd | 5239 | struct hci_conn *hcon = conn->hcon; |
f1496dee JH |
5240 | u16 dcid, mtu, mps, credits, result; |
5241 | struct l2cap_chan *chan; | |
3e64b7bd | 5242 | int err, sec_level; |
f1496dee JH |
5243 | |
5244 | if (cmd_len < sizeof(*rsp)) | |
5245 | return -EPROTO; | |
5246 | ||
5247 | dcid = __le16_to_cpu(rsp->dcid); | |
5248 | mtu = __le16_to_cpu(rsp->mtu); | |
5249 | mps = __le16_to_cpu(rsp->mps); | |
5250 | credits = __le16_to_cpu(rsp->credits); | |
5251 | result = __le16_to_cpu(rsp->result); | |
5252 | ||
40624183 JH |
5253 | if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23 || |
5254 | dcid < L2CAP_CID_DYN_START || | |
5255 | dcid > L2CAP_CID_LE_DYN_END)) | |
f1496dee JH |
5256 | return -EPROTO; |
5257 | ||
5258 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x", | |
5259 | dcid, mtu, mps, credits, result); | |
5260 | ||
5261 | mutex_lock(&conn->chan_lock); | |
5262 | ||
5263 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5264 | if (!chan) { | |
5265 | err = -EBADSLT; | |
5266 | goto unlock; | |
5267 | } | |
5268 | ||
5269 | err = 0; | |
5270 | ||
5271 | l2cap_chan_lock(chan); | |
5272 | ||
5273 | switch (result) { | |
5274 | case L2CAP_CR_SUCCESS: | |
40624183 JH |
5275 | if (__l2cap_get_chan_by_dcid(conn, dcid)) { |
5276 | err = -EBADSLT; | |
5277 | break; | |
5278 | } | |
5279 | ||
f1496dee JH |
5280 | chan->ident = 0; |
5281 | chan->dcid = dcid; | |
5282 | chan->omtu = mtu; | |
5283 | chan->remote_mps = mps; | |
0cd75f7e | 5284 | chan->tx_credits = credits; |
f1496dee JH |
5285 | l2cap_chan_ready(chan); |
5286 | break; | |
5287 | ||
3e64b7bd JH |
5288 | case L2CAP_CR_AUTHENTICATION: |
5289 | case L2CAP_CR_ENCRYPTION: | |
5290 | /* If we already have MITM protection we can't do | |
5291 | * anything. | |
5292 | */ | |
5293 | if (hcon->sec_level > BT_SECURITY_MEDIUM) { | |
5294 | l2cap_chan_del(chan, ECONNREFUSED); | |
5295 | break; | |
5296 | } | |
5297 | ||
5298 | sec_level = hcon->sec_level + 1; | |
5299 | if (chan->sec_level < sec_level) | |
5300 | chan->sec_level = sec_level; | |
5301 | ||
5302 | /* We'll need to send a new Connect Request */ | |
5303 | clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags); | |
5304 | ||
5305 | smp_conn_security(hcon, chan->sec_level); | |
5306 | break; | |
5307 | ||
f1496dee JH |
5308 | default: |
5309 | l2cap_chan_del(chan, ECONNREFUSED); | |
5310 | break; | |
5311 | } | |
5312 | ||
5313 | l2cap_chan_unlock(chan); | |
5314 | ||
5315 | unlock: | |
5316 | mutex_unlock(&conn->chan_lock); | |
5317 | ||
5318 | return err; | |
5319 | } | |
5320 | ||
3300d9a9 | 5321 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2d792818 GP |
5322 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5323 | u8 *data) | |
3300d9a9 CT |
5324 | { |
5325 | int err = 0; | |
5326 | ||
5327 | switch (cmd->code) { | |
5328 | case L2CAP_COMMAND_REJ: | |
cb3b3152 | 5329 | l2cap_command_rej(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5330 | break; |
5331 | ||
5332 | case L2CAP_CONN_REQ: | |
cb3b3152 | 5333 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5334 | break; |
5335 | ||
5336 | case L2CAP_CONN_RSP: | |
f5a2598d | 5337 | case L2CAP_CREATE_CHAN_RSP: |
9245e737 | 5338 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5339 | break; |
5340 | ||
5341 | case L2CAP_CONF_REQ: | |
5342 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
5343 | break; | |
5344 | ||
5345 | case L2CAP_CONF_RSP: | |
9245e737 | 5346 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5347 | break; |
5348 | ||
5349 | case L2CAP_DISCONN_REQ: | |
cb3b3152 | 5350 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5351 | break; |
5352 | ||
5353 | case L2CAP_DISCONN_RSP: | |
9245e737 | 5354 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5355 | break; |
5356 | ||
5357 | case L2CAP_ECHO_REQ: | |
5358 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
5359 | break; | |
5360 | ||
5361 | case L2CAP_ECHO_RSP: | |
5362 | break; | |
5363 | ||
5364 | case L2CAP_INFO_REQ: | |
cb3b3152 | 5365 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5366 | break; |
5367 | ||
5368 | case L2CAP_INFO_RSP: | |
9245e737 | 5369 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
3300d9a9 CT |
5370 | break; |
5371 | ||
f94ff6ff MM |
5372 | case L2CAP_CREATE_CHAN_REQ: |
5373 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
5374 | break; | |
5375 | ||
8d5a04a1 MM |
5376 | case L2CAP_MOVE_CHAN_REQ: |
5377 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
5378 | break; | |
5379 | ||
5380 | case L2CAP_MOVE_CHAN_RSP: | |
9245e737 | 5381 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5382 | break; |
5383 | ||
5384 | case L2CAP_MOVE_CHAN_CFM: | |
5385 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
5386 | break; | |
5387 | ||
5388 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
9245e737 | 5389 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
8d5a04a1 MM |
5390 | break; |
5391 | ||
3300d9a9 CT |
5392 | default: |
5393 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
5394 | err = -EINVAL; | |
5395 | break; | |
5396 | } | |
5397 | ||
5398 | return err; | |
5399 | } | |
5400 | ||
27e2d4c8 JH |
5401 | static int l2cap_le_connect_req(struct l2cap_conn *conn, |
5402 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5403 | u8 *data) | |
5404 | { | |
5405 | struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; | |
5406 | struct l2cap_le_conn_rsp rsp; | |
5407 | struct l2cap_chan *chan, *pchan; | |
0cd75f7e | 5408 | u16 dcid, scid, credits, mtu, mps; |
27e2d4c8 JH |
5409 | __le16 psm; |
5410 | u8 result; | |
5411 | ||
5412 | if (cmd_len != sizeof(*req)) | |
5413 | return -EPROTO; | |
5414 | ||
5415 | scid = __le16_to_cpu(req->scid); | |
5416 | mtu = __le16_to_cpu(req->mtu); | |
5417 | mps = __le16_to_cpu(req->mps); | |
5418 | psm = req->psm; | |
5419 | dcid = 0; | |
0cd75f7e | 5420 | credits = 0; |
27e2d4c8 JH |
5421 | |
5422 | if (mtu < 23 || mps < 23) | |
5423 | return -EPROTO; | |
5424 | ||
5425 | BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm), | |
5426 | scid, mtu, mps); | |
5427 | ||
5428 | /* Check if we have socket listening on psm */ | |
5429 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src, | |
5430 | &conn->hcon->dst, LE_LINK); | |
5431 | if (!pchan) { | |
5432 | result = L2CAP_CR_BAD_PSM; | |
5433 | chan = NULL; | |
5434 | goto response; | |
5435 | } | |
5436 | ||
5437 | mutex_lock(&conn->chan_lock); | |
5438 | l2cap_chan_lock(pchan); | |
5439 | ||
35dc6f83 JH |
5440 | if (!smp_sufficient_security(conn->hcon, pchan->sec_level, |
5441 | SMP_ALLOW_STK)) { | |
27e2d4c8 JH |
5442 | result = L2CAP_CR_AUTHENTICATION; |
5443 | chan = NULL; | |
5444 | goto response_unlock; | |
5445 | } | |
5446 | ||
8a7889cc JH |
5447 | /* Check for valid dynamic CID range */ |
5448 | if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) { | |
5449 | result = L2CAP_CR_INVALID_SCID; | |
5450 | chan = NULL; | |
5451 | goto response_unlock; | |
5452 | } | |
5453 | ||
27e2d4c8 JH |
5454 | /* Check if we already have channel with that dcid */ |
5455 | if (__l2cap_get_chan_by_dcid(conn, scid)) { | |
8a7889cc | 5456 | result = L2CAP_CR_SCID_IN_USE; |
27e2d4c8 JH |
5457 | chan = NULL; |
5458 | goto response_unlock; | |
5459 | } | |
5460 | ||
5461 | chan = pchan->ops->new_connection(pchan); | |
5462 | if (!chan) { | |
5463 | result = L2CAP_CR_NO_MEM; | |
5464 | goto response_unlock; | |
5465 | } | |
5466 | ||
0ce43ce6 JH |
5467 | l2cap_le_flowctl_init(chan); |
5468 | ||
27e2d4c8 JH |
5469 | bacpy(&chan->src, &conn->hcon->src); |
5470 | bacpy(&chan->dst, &conn->hcon->dst); | |
a250e048 JH |
5471 | chan->src_type = bdaddr_src_type(conn->hcon); |
5472 | chan->dst_type = bdaddr_dst_type(conn->hcon); | |
27e2d4c8 JH |
5473 | chan->psm = psm; |
5474 | chan->dcid = scid; | |
5475 | chan->omtu = mtu; | |
5476 | chan->remote_mps = mps; | |
0cd75f7e | 5477 | chan->tx_credits = __le16_to_cpu(req->credits); |
27e2d4c8 JH |
5478 | |
5479 | __l2cap_chan_add(conn, chan); | |
5480 | dcid = chan->scid; | |
0cd75f7e | 5481 | credits = chan->rx_credits; |
27e2d4c8 JH |
5482 | |
5483 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
5484 | ||
5485 | chan->ident = cmd->ident; | |
5486 | ||
5487 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { | |
5488 | l2cap_state_change(chan, BT_CONNECT2); | |
434714dc JH |
5489 | /* The following result value is actually not defined |
5490 | * for LE CoC but we use it to let the function know | |
5491 | * that it should bail out after doing its cleanup | |
5492 | * instead of sending a response. | |
5493 | */ | |
27e2d4c8 JH |
5494 | result = L2CAP_CR_PEND; |
5495 | chan->ops->defer(chan); | |
5496 | } else { | |
5497 | l2cap_chan_ready(chan); | |
5498 | result = L2CAP_CR_SUCCESS; | |
5499 | } | |
5500 | ||
5501 | response_unlock: | |
5502 | l2cap_chan_unlock(pchan); | |
5503 | mutex_unlock(&conn->chan_lock); | |
a24cce14 | 5504 | l2cap_chan_put(pchan); |
27e2d4c8 JH |
5505 | |
5506 | if (result == L2CAP_CR_PEND) | |
5507 | return 0; | |
5508 | ||
5509 | response: | |
5510 | if (chan) { | |
5511 | rsp.mtu = cpu_to_le16(chan->imtu); | |
3916aed8 | 5512 | rsp.mps = cpu_to_le16(chan->mps); |
27e2d4c8 JH |
5513 | } else { |
5514 | rsp.mtu = 0; | |
5515 | rsp.mps = 0; | |
5516 | } | |
5517 | ||
5518 | rsp.dcid = cpu_to_le16(dcid); | |
0cd75f7e | 5519 | rsp.credits = cpu_to_le16(credits); |
27e2d4c8 JH |
5520 | rsp.result = cpu_to_le16(result); |
5521 | ||
5522 | l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp); | |
5523 | ||
5524 | return 0; | |
5525 | } | |
5526 | ||
fad5fc89 JH |
5527 | static inline int l2cap_le_credits(struct l2cap_conn *conn, |
5528 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5529 | u8 *data) | |
5530 | { | |
5531 | struct l2cap_le_credits *pkt; | |
5532 | struct l2cap_chan *chan; | |
0f1bfe4e | 5533 | u16 cid, credits, max_credits; |
fad5fc89 JH |
5534 | |
5535 | if (cmd_len != sizeof(*pkt)) | |
5536 | return -EPROTO; | |
5537 | ||
5538 | pkt = (struct l2cap_le_credits *) data; | |
5539 | cid = __le16_to_cpu(pkt->cid); | |
5540 | credits = __le16_to_cpu(pkt->credits); | |
5541 | ||
5542 | BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits); | |
5543 | ||
5544 | chan = l2cap_get_chan_by_dcid(conn, cid); | |
5545 | if (!chan) | |
5546 | return -EBADSLT; | |
5547 | ||
0f1bfe4e JH |
5548 | max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; |
5549 | if (credits > max_credits) { | |
5550 | BT_ERR("LE credits overflow"); | |
5551 | l2cap_send_disconn_req(chan, ECONNRESET); | |
ee93053d | 5552 | l2cap_chan_unlock(chan); |
0f1bfe4e JH |
5553 | |
5554 | /* Return 0 so that we don't trigger an unnecessary | |
5555 | * command reject packet. | |
5556 | */ | |
5557 | return 0; | |
5558 | } | |
5559 | ||
fad5fc89 JH |
5560 | chan->tx_credits += credits; |
5561 | ||
5562 | while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) { | |
5563 | l2cap_do_send(chan, skb_dequeue(&chan->tx_q)); | |
5564 | chan->tx_credits--; | |
5565 | } | |
5566 | ||
5567 | if (chan->tx_credits) | |
5568 | chan->ops->resume(chan); | |
5569 | ||
5570 | l2cap_chan_unlock(chan); | |
5571 | ||
5572 | return 0; | |
5573 | } | |
5574 | ||
71fb4197 JH |
5575 | static inline int l2cap_le_command_rej(struct l2cap_conn *conn, |
5576 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
5577 | u8 *data) | |
5578 | { | |
5579 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; | |
5580 | struct l2cap_chan *chan; | |
5581 | ||
5582 | if (cmd_len < sizeof(*rej)) | |
5583 | return -EPROTO; | |
5584 | ||
5585 | mutex_lock(&conn->chan_lock); | |
5586 | ||
5587 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); | |
5588 | if (!chan) | |
5589 | goto done; | |
5590 | ||
5591 | l2cap_chan_lock(chan); | |
5592 | l2cap_chan_del(chan, ECONNREFUSED); | |
5593 | l2cap_chan_unlock(chan); | |
5594 | ||
5595 | done: | |
5596 | mutex_unlock(&conn->chan_lock); | |
5597 | return 0; | |
5598 | } | |
5599 | ||
3300d9a9 | 5600 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
203e639e JH |
5601 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5602 | u8 *data) | |
3300d9a9 | 5603 | { |
b5ecba64 JH |
5604 | int err = 0; |
5605 | ||
3300d9a9 CT |
5606 | switch (cmd->code) { |
5607 | case L2CAP_COMMAND_REJ: | |
71fb4197 | 5608 | l2cap_le_command_rej(conn, cmd, cmd_len, data); |
b5ecba64 | 5609 | break; |
3300d9a9 CT |
5610 | |
5611 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
b5ecba64 JH |
5612 | err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
5613 | break; | |
3300d9a9 CT |
5614 | |
5615 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
b5ecba64 | 5616 | break; |
3300d9a9 | 5617 | |
f1496dee JH |
5618 | case L2CAP_LE_CONN_RSP: |
5619 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5620 | break; |
f1496dee | 5621 | |
27e2d4c8 | 5622 | case L2CAP_LE_CONN_REQ: |
b5ecba64 JH |
5623 | err = l2cap_le_connect_req(conn, cmd, cmd_len, data); |
5624 | break; | |
27e2d4c8 | 5625 | |
fad5fc89 JH |
5626 | case L2CAP_LE_CREDITS: |
5627 | err = l2cap_le_credits(conn, cmd, cmd_len, data); | |
5628 | break; | |
5629 | ||
3defe01a | 5630 | case L2CAP_DISCONN_REQ: |
b5ecba64 JH |
5631 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
5632 | break; | |
3defe01a JH |
5633 | |
5634 | case L2CAP_DISCONN_RSP: | |
5635 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); | |
b5ecba64 | 5636 | break; |
3defe01a | 5637 | |
3300d9a9 CT |
5638 | default: |
5639 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
b5ecba64 JH |
5640 | err = -EINVAL; |
5641 | break; | |
3300d9a9 | 5642 | } |
b5ecba64 JH |
5643 | |
5644 | return err; | |
3300d9a9 CT |
5645 | } |
5646 | ||
c5623556 JH |
5647 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
5648 | struct sk_buff *skb) | |
5649 | { | |
69c4e4e8 | 5650 | struct hci_conn *hcon = conn->hcon; |
4f3e219d MH |
5651 | struct l2cap_cmd_hdr *cmd; |
5652 | u16 len; | |
c5623556 JH |
5653 | int err; |
5654 | ||
69c4e4e8 | 5655 | if (hcon->type != LE_LINK) |
3b166295 | 5656 | goto drop; |
69c4e4e8 | 5657 | |
4f3e219d MH |
5658 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
5659 | goto drop; | |
c5623556 | 5660 | |
4f3e219d MH |
5661 | cmd = (void *) skb->data; |
5662 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); | |
c5623556 | 5663 | |
4f3e219d | 5664 | len = le16_to_cpu(cmd->len); |
c5623556 | 5665 | |
4f3e219d | 5666 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident); |
c5623556 | 5667 | |
4f3e219d MH |
5668 | if (len != skb->len || !cmd->ident) { |
5669 | BT_DBG("corrupted command"); | |
5670 | goto drop; | |
5671 | } | |
c5623556 | 5672 | |
203e639e | 5673 | err = l2cap_le_sig_cmd(conn, cmd, len, skb->data); |
4f3e219d MH |
5674 | if (err) { |
5675 | struct l2cap_cmd_rej_unk rej; | |
c5623556 | 5676 | |
4f3e219d | 5677 | BT_ERR("Wrong link type (%d)", err); |
c5623556 | 5678 | |
dcf4adbf | 5679 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
4f3e219d MH |
5680 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
5681 | sizeof(rej), &rej); | |
c5623556 JH |
5682 | } |
5683 | ||
3b166295 | 5684 | drop: |
c5623556 JH |
5685 | kfree_skb(skb); |
5686 | } | |
5687 | ||
3300d9a9 | 5688 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
2d792818 | 5689 | struct sk_buff *skb) |
1da177e4 | 5690 | { |
69c4e4e8 | 5691 | struct hci_conn *hcon = conn->hcon; |
1da177e4 LT |
5692 | u8 *data = skb->data; |
5693 | int len = skb->len; | |
5694 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 5695 | int err; |
1da177e4 LT |
5696 | |
5697 | l2cap_raw_recv(conn, skb); | |
5698 | ||
69c4e4e8 | 5699 | if (hcon->type != ACL_LINK) |
3b166295 | 5700 | goto drop; |
69c4e4e8 | 5701 | |
1da177e4 | 5702 | while (len >= L2CAP_CMD_HDR_SIZE) { |
88219a0f | 5703 | u16 cmd_len; |
1da177e4 LT |
5704 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
5705 | data += L2CAP_CMD_HDR_SIZE; | |
5706 | len -= L2CAP_CMD_HDR_SIZE; | |
5707 | ||
88219a0f | 5708 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 5709 | |
2d792818 GP |
5710 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, |
5711 | cmd.ident); | |
1da177e4 | 5712 | |
88219a0f | 5713 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
5714 | BT_DBG("corrupted command"); |
5715 | break; | |
5716 | } | |
5717 | ||
c5623556 | 5718 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); |
1da177e4 | 5719 | if (err) { |
e2fd318e | 5720 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
5721 | |
5722 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 | 5723 | |
dcf4adbf | 5724 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
2d792818 GP |
5725 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, |
5726 | sizeof(rej), &rej); | |
1da177e4 LT |
5727 | } |
5728 | ||
88219a0f AV |
5729 | data += cmd_len; |
5730 | len -= cmd_len; | |
1da177e4 LT |
5731 | } |
5732 | ||
3b166295 | 5733 | drop: |
1da177e4 LT |
5734 | kfree_skb(skb); |
5735 | } | |
5736 | ||
47d1ec61 | 5737 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
5738 | { |
5739 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
5740 | int hdr_size; |
5741 | ||
5742 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
5743 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
5744 | else | |
5745 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 5746 | |
47d1ec61 | 5747 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 5748 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
5749 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
5750 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
5751 | ||
5752 | if (our_fcs != rcv_fcs) | |
7a560e5c | 5753 | return -EBADMSG; |
fcc203c3 GP |
5754 | } |
5755 | return 0; | |
5756 | } | |
5757 | ||
6ea00485 | 5758 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 5759 | { |
e31f7633 | 5760 | struct l2cap_ctrl control; |
d5392c8f | 5761 | |
e31f7633 | 5762 | BT_DBG("chan %p", chan); |
d5392c8f | 5763 | |
e31f7633 MM |
5764 | memset(&control, 0, sizeof(control)); |
5765 | control.sframe = 1; | |
5766 | control.final = 1; | |
5767 | control.reqseq = chan->buffer_seq; | |
5768 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
d5392c8f | 5769 | |
e2ab4353 | 5770 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
e31f7633 MM |
5771 | control.super = L2CAP_SUPER_RNR; |
5772 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5773 | } |
5774 | ||
e31f7633 MM |
5775 | if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
5776 | chan->unacked_frames > 0) | |
5777 | __set_retrans_timer(chan); | |
d5392c8f | 5778 | |
e31f7633 | 5779 | /* Send pending iframes */ |
525cd185 | 5780 | l2cap_ertm_send(chan); |
d5392c8f | 5781 | |
e2ab4353 | 5782 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
e31f7633 MM |
5783 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
5784 | /* F-bit wasn't sent in an s-frame or i-frame yet, so | |
5785 | * send it now. | |
5786 | */ | |
5787 | control.super = L2CAP_SUPER_RR; | |
5788 | l2cap_send_sframe(chan, &control); | |
d5392c8f GP |
5789 | } |
5790 | } | |
5791 | ||
2d792818 GP |
5792 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
5793 | struct sk_buff **last_frag) | |
18778a63 | 5794 | { |
84084a31 MM |
5795 | /* skb->len reflects data in skb as well as all fragments |
5796 | * skb->data_len reflects only data in fragments | |
5797 | */ | |
5798 | if (!skb_has_frag_list(skb)) | |
5799 | skb_shinfo(skb)->frag_list = new_frag; | |
5800 | ||
5801 | new_frag->next = NULL; | |
5802 | ||
5803 | (*last_frag)->next = new_frag; | |
5804 | *last_frag = new_frag; | |
5805 | ||
5806 | skb->len += new_frag->len; | |
5807 | skb->data_len += new_frag->len; | |
5808 | skb->truesize += new_frag->truesize; | |
5809 | } | |
5810 | ||
4b51dae9 MM |
5811 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
5812 | struct l2cap_ctrl *control) | |
84084a31 MM |
5813 | { |
5814 | int err = -EINVAL; | |
18778a63 | 5815 | |
4b51dae9 | 5816 | switch (control->sar) { |
7e0ef6ee | 5817 | case L2CAP_SAR_UNSEGMENTED: |
84084a31 MM |
5818 | if (chan->sdu) |
5819 | break; | |
18778a63 | 5820 | |
80b98027 | 5821 | err = chan->ops->recv(chan, skb); |
84084a31 | 5822 | break; |
18778a63 | 5823 | |
7e0ef6ee | 5824 | case L2CAP_SAR_START: |
84084a31 MM |
5825 | if (chan->sdu) |
5826 | break; | |
18778a63 | 5827 | |
6f61fd47 | 5828 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 5829 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 5830 | |
84084a31 MM |
5831 | if (chan->sdu_len > chan->imtu) { |
5832 | err = -EMSGSIZE; | |
5833 | break; | |
5834 | } | |
1890d36b | 5835 | |
84084a31 MM |
5836 | if (skb->len >= chan->sdu_len) |
5837 | break; | |
18778a63 | 5838 | |
84084a31 MM |
5839 | chan->sdu = skb; |
5840 | chan->sdu_last_frag = skb; | |
18778a63 | 5841 | |
84084a31 MM |
5842 | skb = NULL; |
5843 | err = 0; | |
18778a63 GP |
5844 | break; |
5845 | ||
7e0ef6ee | 5846 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 5847 | if (!chan->sdu) |
84084a31 | 5848 | break; |
18778a63 | 5849 | |
84084a31 MM |
5850 | append_skb_frag(chan->sdu, skb, |
5851 | &chan->sdu_last_frag); | |
5852 | skb = NULL; | |
18778a63 | 5853 | |
84084a31 MM |
5854 | if (chan->sdu->len >= chan->sdu_len) |
5855 | break; | |
4178ba46 | 5856 | |
84084a31 | 5857 | err = 0; |
18778a63 GP |
5858 | break; |
5859 | ||
7e0ef6ee | 5860 | case L2CAP_SAR_END: |
6f61fd47 | 5861 | if (!chan->sdu) |
84084a31 | 5862 | break; |
18778a63 | 5863 | |
84084a31 MM |
5864 | append_skb_frag(chan->sdu, skb, |
5865 | &chan->sdu_last_frag); | |
5866 | skb = NULL; | |
4178ba46 | 5867 | |
84084a31 MM |
5868 | if (chan->sdu->len != chan->sdu_len) |
5869 | break; | |
18778a63 | 5870 | |
80b98027 | 5871 | err = chan->ops->recv(chan, chan->sdu); |
1890d36b | 5872 | |
84084a31 MM |
5873 | if (!err) { |
5874 | /* Reassembly complete */ | |
5875 | chan->sdu = NULL; | |
5876 | chan->sdu_last_frag = NULL; | |
5877 | chan->sdu_len = 0; | |
1890d36b | 5878 | } |
18778a63 GP |
5879 | break; |
5880 | } | |
5881 | ||
84084a31 MM |
5882 | if (err) { |
5883 | kfree_skb(skb); | |
5884 | kfree_skb(chan->sdu); | |
5885 | chan->sdu = NULL; | |
5886 | chan->sdu_last_frag = NULL; | |
5887 | chan->sdu_len = 0; | |
5888 | } | |
18778a63 | 5889 | |
84084a31 | 5890 | return err; |
18778a63 GP |
5891 | } |
5892 | ||
32b32735 MM |
5893 | static int l2cap_resegment(struct l2cap_chan *chan) |
5894 | { | |
5895 | /* Placeholder */ | |
5896 | return 0; | |
5897 | } | |
5898 | ||
61aa4f5b | 5899 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
26f880d2 | 5900 | { |
61aa4f5b | 5901 | u8 event; |
712132eb | 5902 | |
61aa4f5b MM |
5903 | if (chan->mode != L2CAP_MODE_ERTM) |
5904 | return; | |
712132eb | 5905 | |
61aa4f5b | 5906 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
401bb1f7 | 5907 | l2cap_tx(chan, NULL, NULL, event); |
1890d36b GP |
5908 | } |
5909 | ||
d2a7ac5d MM |
5910 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
5911 | { | |
63838725 MM |
5912 | int err = 0; |
5913 | /* Pass sequential frames to l2cap_reassemble_sdu() | |
5914 | * until a gap is encountered. | |
5915 | */ | |
5916 | ||
5917 | BT_DBG("chan %p", chan); | |
5918 | ||
5919 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
5920 | struct sk_buff *skb; | |
5921 | BT_DBG("Searching for skb with txseq %d (queue len %d)", | |
5922 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); | |
5923 | ||
5924 | skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq); | |
5925 | ||
5926 | if (!skb) | |
5927 | break; | |
5928 | ||
5929 | skb_unlink(skb, &chan->srej_q); | |
5930 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
a4368ff3 | 5931 | err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap); |
63838725 MM |
5932 | if (err) |
5933 | break; | |
5934 | } | |
5935 | ||
5936 | if (skb_queue_empty(&chan->srej_q)) { | |
5937 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
5938 | l2cap_send_ack(chan); | |
5939 | } | |
5940 | ||
5941 | return err; | |
d2a7ac5d MM |
5942 | } |
5943 | ||
5944 | static void l2cap_handle_srej(struct l2cap_chan *chan, | |
5945 | struct l2cap_ctrl *control) | |
5946 | { | |
f80842a8 MM |
5947 | struct sk_buff *skb; |
5948 | ||
5949 | BT_DBG("chan %p, control %p", chan, control); | |
5950 | ||
5951 | if (control->reqseq == chan->next_tx_seq) { | |
5952 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 5953 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5954 | return; |
5955 | } | |
5956 | ||
5957 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
5958 | ||
5959 | if (skb == NULL) { | |
5960 | BT_DBG("Seq %d not available for retransmission", | |
5961 | control->reqseq); | |
5962 | return; | |
5963 | } | |
5964 | ||
a4368ff3 | 5965 | if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) { |
f80842a8 | 5966 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
5e4e3972 | 5967 | l2cap_send_disconn_req(chan, ECONNRESET); |
f80842a8 MM |
5968 | return; |
5969 | } | |
5970 | ||
5971 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
5972 | ||
5973 | if (control->poll) { | |
5974 | l2cap_pass_to_tx(chan, control); | |
5975 | ||
5976 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
5977 | l2cap_retransmit(chan, control); | |
5978 | l2cap_ertm_send(chan); | |
5979 | ||
5980 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5981 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5982 | chan->srej_save_reqseq = control->reqseq; | |
5983 | } | |
5984 | } else { | |
5985 | l2cap_pass_to_tx_fbit(chan, control); | |
5986 | ||
5987 | if (control->final) { | |
5988 | if (chan->srej_save_reqseq != control->reqseq || | |
5989 | !test_and_clear_bit(CONN_SREJ_ACT, | |
5990 | &chan->conn_state)) | |
5991 | l2cap_retransmit(chan, control); | |
5992 | } else { | |
5993 | l2cap_retransmit(chan, control); | |
5994 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { | |
5995 | set_bit(CONN_SREJ_ACT, &chan->conn_state); | |
5996 | chan->srej_save_reqseq = control->reqseq; | |
5997 | } | |
5998 | } | |
5999 | } | |
d2a7ac5d MM |
6000 | } |
6001 | ||
6002 | static void l2cap_handle_rej(struct l2cap_chan *chan, | |
6003 | struct l2cap_ctrl *control) | |
6004 | { | |
fcd289df MM |
6005 | struct sk_buff *skb; |
6006 | ||
6007 | BT_DBG("chan %p, control %p", chan, control); | |
6008 | ||
6009 | if (control->reqseq == chan->next_tx_seq) { | |
6010 | BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq); | |
5e4e3972 | 6011 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
6012 | return; |
6013 | } | |
6014 | ||
6015 | skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq); | |
6016 | ||
6017 | if (chan->max_tx && skb && | |
a4368ff3 | 6018 | bt_cb(skb)->l2cap.retries >= chan->max_tx) { |
fcd289df | 6019 | BT_DBG("Retry limit exceeded (%d)", chan->max_tx); |
5e4e3972 | 6020 | l2cap_send_disconn_req(chan, ECONNRESET); |
fcd289df MM |
6021 | return; |
6022 | } | |
6023 | ||
6024 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6025 | ||
6026 | l2cap_pass_to_tx(chan, control); | |
6027 | ||
6028 | if (control->final) { | |
6029 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) | |
6030 | l2cap_retransmit_all(chan, control); | |
6031 | } else { | |
6032 | l2cap_retransmit_all(chan, control); | |
6033 | l2cap_ertm_send(chan); | |
6034 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) | |
6035 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
6036 | } | |
d2a7ac5d MM |
6037 | } |
6038 | ||
4b51dae9 MM |
6039 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
6040 | { | |
6041 | BT_DBG("chan %p, txseq %d", chan, txseq); | |
6042 | ||
6043 | BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq, | |
6044 | chan->expected_tx_seq); | |
6045 | ||
6046 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { | |
6047 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
2d792818 | 6048 | chan->tx_win) { |
4b51dae9 MM |
6049 | /* See notes below regarding "double poll" and |
6050 | * invalid packets. | |
6051 | */ | |
6052 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6053 | BT_DBG("Invalid/Ignore - after SREJ"); | |
6054 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6055 | } else { | |
6056 | BT_DBG("Invalid - in window after SREJ sent"); | |
6057 | return L2CAP_TXSEQ_INVALID; | |
6058 | } | |
6059 | } | |
6060 | ||
6061 | if (chan->srej_list.head == txseq) { | |
6062 | BT_DBG("Expected SREJ"); | |
6063 | return L2CAP_TXSEQ_EXPECTED_SREJ; | |
6064 | } | |
6065 | ||
6066 | if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) { | |
6067 | BT_DBG("Duplicate SREJ - txseq already stored"); | |
6068 | return L2CAP_TXSEQ_DUPLICATE_SREJ; | |
6069 | } | |
6070 | ||
6071 | if (l2cap_seq_list_contains(&chan->srej_list, txseq)) { | |
6072 | BT_DBG("Unexpected SREJ - not requested"); | |
6073 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; | |
6074 | } | |
6075 | } | |
6076 | ||
6077 | if (chan->expected_tx_seq == txseq) { | |
6078 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= | |
6079 | chan->tx_win) { | |
6080 | BT_DBG("Invalid - txseq outside tx window"); | |
6081 | return L2CAP_TXSEQ_INVALID; | |
6082 | } else { | |
6083 | BT_DBG("Expected"); | |
6084 | return L2CAP_TXSEQ_EXPECTED; | |
6085 | } | |
6086 | } | |
6087 | ||
6088 | if (__seq_offset(chan, txseq, chan->last_acked_seq) < | |
2d792818 | 6089 | __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) { |
4b51dae9 MM |
6090 | BT_DBG("Duplicate - expected_tx_seq later than txseq"); |
6091 | return L2CAP_TXSEQ_DUPLICATE; | |
6092 | } | |
6093 | ||
6094 | if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) { | |
6095 | /* A source of invalid packets is a "double poll" condition, | |
6096 | * where delays cause us to send multiple poll packets. If | |
6097 | * the remote stack receives and processes both polls, | |
6098 | * sequence numbers can wrap around in such a way that a | |
6099 | * resent frame has a sequence number that looks like new data | |
6100 | * with a sequence gap. This would trigger an erroneous SREJ | |
6101 | * request. | |
6102 | * | |
6103 | * Fortunately, this is impossible with a tx window that's | |
6104 | * less than half of the maximum sequence number, which allows | |
6105 | * invalid frames to be safely ignored. | |
6106 | * | |
6107 | * With tx window sizes greater than half of the tx window | |
6108 | * maximum, the frame is invalid and cannot be ignored. This | |
6109 | * causes a disconnect. | |
6110 | */ | |
6111 | ||
6112 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { | |
6113 | BT_DBG("Invalid/Ignore - txseq outside tx window"); | |
6114 | return L2CAP_TXSEQ_INVALID_IGNORE; | |
6115 | } else { | |
6116 | BT_DBG("Invalid - txseq outside tx window"); | |
6117 | return L2CAP_TXSEQ_INVALID; | |
6118 | } | |
6119 | } else { | |
6120 | BT_DBG("Unexpected - txseq indicates missing frames"); | |
6121 | return L2CAP_TXSEQ_UNEXPECTED; | |
6122 | } | |
6123 | } | |
6124 | ||
d2a7ac5d MM |
6125 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
6126 | struct l2cap_ctrl *control, | |
6127 | struct sk_buff *skb, u8 event) | |
6128 | { | |
6129 | int err = 0; | |
941247f9 | 6130 | bool skb_in_use = false; |
d2a7ac5d MM |
6131 | |
6132 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6133 | event); | |
6134 | ||
6135 | switch (event) { | |
6136 | case L2CAP_EV_RECV_IFRAME: | |
6137 | switch (l2cap_classify_txseq(chan, control->txseq)) { | |
6138 | case L2CAP_TXSEQ_EXPECTED: | |
6139 | l2cap_pass_to_tx(chan, control); | |
6140 | ||
6141 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6142 | BT_DBG("Busy, discarding expected seq %d", | |
6143 | control->txseq); | |
6144 | break; | |
6145 | } | |
6146 | ||
6147 | chan->expected_tx_seq = __next_seq(chan, | |
6148 | control->txseq); | |
6149 | ||
6150 | chan->buffer_seq = chan->expected_tx_seq; | |
941247f9 | 6151 | skb_in_use = true; |
d2a7ac5d MM |
6152 | |
6153 | err = l2cap_reassemble_sdu(chan, skb, control); | |
6154 | if (err) | |
6155 | break; | |
6156 | ||
6157 | if (control->final) { | |
6158 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6159 | &chan->conn_state)) { | |
6160 | control->final = 0; | |
6161 | l2cap_retransmit_all(chan, control); | |
6162 | l2cap_ertm_send(chan); | |
6163 | } | |
6164 | } | |
6165 | ||
6166 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) | |
6167 | l2cap_send_ack(chan); | |
6168 | break; | |
6169 | case L2CAP_TXSEQ_UNEXPECTED: | |
6170 | l2cap_pass_to_tx(chan, control); | |
6171 | ||
6172 | /* Can't issue SREJ frames in the local busy state. | |
6173 | * Drop this frame, it will be seen as missing | |
6174 | * when local busy is exited. | |
6175 | */ | |
6176 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
6177 | BT_DBG("Busy, discarding unexpected seq %d", | |
6178 | control->txseq); | |
6179 | break; | |
6180 | } | |
6181 | ||
6182 | /* There was a gap in the sequence, so an SREJ | |
6183 | * must be sent for each missing frame. The | |
6184 | * current frame is stored for later use. | |
6185 | */ | |
6186 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6187 | skb_in_use = true; |
d2a7ac5d MM |
6188 | BT_DBG("Queued %p (queue len %d)", skb, |
6189 | skb_queue_len(&chan->srej_q)); | |
6190 | ||
6191 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); | |
6192 | l2cap_seq_list_clear(&chan->srej_list); | |
6193 | l2cap_send_srej(chan, control->txseq); | |
6194 | ||
6195 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; | |
6196 | break; | |
6197 | case L2CAP_TXSEQ_DUPLICATE: | |
6198 | l2cap_pass_to_tx(chan, control); | |
6199 | break; | |
6200 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6201 | break; | |
6202 | case L2CAP_TXSEQ_INVALID: | |
6203 | default: | |
5e4e3972 | 6204 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6205 | break; |
6206 | } | |
6207 | break; | |
6208 | case L2CAP_EV_RECV_RR: | |
6209 | l2cap_pass_to_tx(chan, control); | |
6210 | if (control->final) { | |
6211 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6212 | ||
e6a3ee6e MM |
6213 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) && |
6214 | !__chan_is_moving(chan)) { | |
d2a7ac5d MM |
6215 | control->final = 0; |
6216 | l2cap_retransmit_all(chan, control); | |
6217 | } | |
6218 | ||
6219 | l2cap_ertm_send(chan); | |
6220 | } else if (control->poll) { | |
6221 | l2cap_send_i_or_rr_or_rnr(chan); | |
6222 | } else { | |
6223 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6224 | &chan->conn_state) && | |
6225 | chan->unacked_frames) | |
6226 | __set_retrans_timer(chan); | |
6227 | ||
6228 | l2cap_ertm_send(chan); | |
6229 | } | |
6230 | break; | |
6231 | case L2CAP_EV_RECV_RNR: | |
6232 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6233 | l2cap_pass_to_tx(chan, control); | |
6234 | if (control && control->poll) { | |
6235 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6236 | l2cap_send_rr_or_rnr(chan, 0); | |
6237 | } | |
6238 | __clear_retrans_timer(chan); | |
6239 | l2cap_seq_list_clear(&chan->retrans_list); | |
6240 | break; | |
6241 | case L2CAP_EV_RECV_REJ: | |
6242 | l2cap_handle_rej(chan, control); | |
6243 | break; | |
6244 | case L2CAP_EV_RECV_SREJ: | |
6245 | l2cap_handle_srej(chan, control); | |
6246 | break; | |
6247 | default: | |
6248 | break; | |
6249 | } | |
6250 | ||
6251 | if (skb && !skb_in_use) { | |
6252 | BT_DBG("Freeing %p", skb); | |
6253 | kfree_skb(skb); | |
6254 | } | |
6255 | ||
6256 | return err; | |
6257 | } | |
6258 | ||
6259 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, | |
6260 | struct l2cap_ctrl *control, | |
6261 | struct sk_buff *skb, u8 event) | |
6262 | { | |
6263 | int err = 0; | |
6264 | u16 txseq = control->txseq; | |
941247f9 | 6265 | bool skb_in_use = false; |
d2a7ac5d MM |
6266 | |
6267 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6268 | event); | |
6269 | ||
6270 | switch (event) { | |
6271 | case L2CAP_EV_RECV_IFRAME: | |
6272 | switch (l2cap_classify_txseq(chan, txseq)) { | |
6273 | case L2CAP_TXSEQ_EXPECTED: | |
6274 | /* Keep frame for reassembly later */ | |
6275 | l2cap_pass_to_tx(chan, control); | |
6276 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6277 | skb_in_use = true; |
d2a7ac5d MM |
6278 | BT_DBG("Queued %p (queue len %d)", skb, |
6279 | skb_queue_len(&chan->srej_q)); | |
6280 | ||
6281 | chan->expected_tx_seq = __next_seq(chan, txseq); | |
6282 | break; | |
6283 | case L2CAP_TXSEQ_EXPECTED_SREJ: | |
6284 | l2cap_seq_list_pop(&chan->srej_list); | |
6285 | ||
6286 | l2cap_pass_to_tx(chan, control); | |
6287 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6288 | skb_in_use = true; |
d2a7ac5d MM |
6289 | BT_DBG("Queued %p (queue len %d)", skb, |
6290 | skb_queue_len(&chan->srej_q)); | |
6291 | ||
6292 | err = l2cap_rx_queued_iframes(chan); | |
6293 | if (err) | |
6294 | break; | |
6295 | ||
6296 | break; | |
6297 | case L2CAP_TXSEQ_UNEXPECTED: | |
6298 | /* Got a frame that can't be reassembled yet. | |
6299 | * Save it for later, and send SREJs to cover | |
6300 | * the missing frames. | |
6301 | */ | |
6302 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6303 | skb_in_use = true; |
d2a7ac5d MM |
6304 | BT_DBG("Queued %p (queue len %d)", skb, |
6305 | skb_queue_len(&chan->srej_q)); | |
6306 | ||
6307 | l2cap_pass_to_tx(chan, control); | |
6308 | l2cap_send_srej(chan, control->txseq); | |
6309 | break; | |
6310 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: | |
6311 | /* This frame was requested with an SREJ, but | |
6312 | * some expected retransmitted frames are | |
6313 | * missing. Request retransmission of missing | |
6314 | * SREJ'd frames. | |
6315 | */ | |
6316 | skb_queue_tail(&chan->srej_q, skb); | |
941247f9 | 6317 | skb_in_use = true; |
d2a7ac5d MM |
6318 | BT_DBG("Queued %p (queue len %d)", skb, |
6319 | skb_queue_len(&chan->srej_q)); | |
6320 | ||
6321 | l2cap_pass_to_tx(chan, control); | |
6322 | l2cap_send_srej_list(chan, control->txseq); | |
6323 | break; | |
6324 | case L2CAP_TXSEQ_DUPLICATE_SREJ: | |
6325 | /* We've already queued this frame. Drop this copy. */ | |
6326 | l2cap_pass_to_tx(chan, control); | |
6327 | break; | |
6328 | case L2CAP_TXSEQ_DUPLICATE: | |
6329 | /* Expecting a later sequence number, so this frame | |
6330 | * was already received. Ignore it completely. | |
6331 | */ | |
6332 | break; | |
6333 | case L2CAP_TXSEQ_INVALID_IGNORE: | |
6334 | break; | |
6335 | case L2CAP_TXSEQ_INVALID: | |
6336 | default: | |
5e4e3972 | 6337 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6338 | break; |
6339 | } | |
6340 | break; | |
6341 | case L2CAP_EV_RECV_RR: | |
6342 | l2cap_pass_to_tx(chan, control); | |
6343 | if (control->final) { | |
6344 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6345 | ||
6346 | if (!test_and_clear_bit(CONN_REJ_ACT, | |
6347 | &chan->conn_state)) { | |
6348 | control->final = 0; | |
6349 | l2cap_retransmit_all(chan, control); | |
6350 | } | |
6351 | ||
6352 | l2cap_ertm_send(chan); | |
6353 | } else if (control->poll) { | |
6354 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6355 | &chan->conn_state) && | |
6356 | chan->unacked_frames) { | |
6357 | __set_retrans_timer(chan); | |
6358 | } | |
6359 | ||
6360 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6361 | l2cap_send_srej_tail(chan); | |
6362 | } else { | |
6363 | if (test_and_clear_bit(CONN_REMOTE_BUSY, | |
6364 | &chan->conn_state) && | |
6365 | chan->unacked_frames) | |
6366 | __set_retrans_timer(chan); | |
6367 | ||
6368 | l2cap_send_ack(chan); | |
6369 | } | |
6370 | break; | |
6371 | case L2CAP_EV_RECV_RNR: | |
6372 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6373 | l2cap_pass_to_tx(chan, control); | |
6374 | if (control->poll) { | |
6375 | l2cap_send_srej_tail(chan); | |
6376 | } else { | |
6377 | struct l2cap_ctrl rr_control; | |
6378 | memset(&rr_control, 0, sizeof(rr_control)); | |
6379 | rr_control.sframe = 1; | |
6380 | rr_control.super = L2CAP_SUPER_RR; | |
6381 | rr_control.reqseq = chan->buffer_seq; | |
6382 | l2cap_send_sframe(chan, &rr_control); | |
6383 | } | |
6384 | ||
6385 | break; | |
6386 | case L2CAP_EV_RECV_REJ: | |
6387 | l2cap_handle_rej(chan, control); | |
6388 | break; | |
6389 | case L2CAP_EV_RECV_SREJ: | |
6390 | l2cap_handle_srej(chan, control); | |
6391 | break; | |
6392 | } | |
6393 | ||
6394 | if (skb && !skb_in_use) { | |
6395 | BT_DBG("Freeing %p", skb); | |
6396 | kfree_skb(skb); | |
6397 | } | |
6398 | ||
6399 | return err; | |
6400 | } | |
6401 | ||
32b32735 MM |
6402 | static int l2cap_finish_move(struct l2cap_chan *chan) |
6403 | { | |
6404 | BT_DBG("chan %p", chan); | |
6405 | ||
6406 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6407 | ||
6408 | if (chan->hs_hcon) | |
6409 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6410 | else | |
6411 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6412 | ||
6413 | return l2cap_resegment(chan); | |
6414 | } | |
6415 | ||
6416 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, | |
6417 | struct l2cap_ctrl *control, | |
6418 | struct sk_buff *skb, u8 event) | |
6419 | { | |
6420 | int err; | |
6421 | ||
6422 | BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb, | |
6423 | event); | |
6424 | ||
6425 | if (!control->poll) | |
6426 | return -EPROTO; | |
6427 | ||
6428 | l2cap_process_reqseq(chan, control->reqseq); | |
6429 | ||
6430 | if (!skb_queue_empty(&chan->tx_q)) | |
6431 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6432 | else | |
6433 | chan->tx_send_head = NULL; | |
6434 | ||
6435 | /* Rewind next_tx_seq to the point expected | |
6436 | * by the receiver. | |
6437 | */ | |
6438 | chan->next_tx_seq = control->reqseq; | |
6439 | chan->unacked_frames = 0; | |
6440 | ||
6441 | err = l2cap_finish_move(chan); | |
6442 | if (err) | |
6443 | return err; | |
6444 | ||
6445 | set_bit(CONN_SEND_FBIT, &chan->conn_state); | |
6446 | l2cap_send_i_or_rr_or_rnr(chan); | |
6447 | ||
6448 | if (event == L2CAP_EV_RECV_IFRAME) | |
6449 | return -EPROTO; | |
6450 | ||
6451 | return l2cap_rx_state_recv(chan, control, NULL, event); | |
6452 | } | |
6453 | ||
6454 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, | |
6455 | struct l2cap_ctrl *control, | |
6456 | struct sk_buff *skb, u8 event) | |
6457 | { | |
6458 | int err; | |
6459 | ||
6460 | if (!control->final) | |
6461 | return -EPROTO; | |
6462 | ||
6463 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); | |
6464 | ||
6465 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
6466 | l2cap_process_reqseq(chan, control->reqseq); | |
6467 | ||
6468 | if (!skb_queue_empty(&chan->tx_q)) | |
6469 | chan->tx_send_head = skb_peek(&chan->tx_q); | |
6470 | else | |
6471 | chan->tx_send_head = NULL; | |
6472 | ||
6473 | /* Rewind next_tx_seq to the point expected | |
6474 | * by the receiver. | |
6475 | */ | |
6476 | chan->next_tx_seq = control->reqseq; | |
6477 | chan->unacked_frames = 0; | |
6478 | ||
6479 | if (chan->hs_hcon) | |
6480 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; | |
6481 | else | |
6482 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; | |
6483 | ||
6484 | err = l2cap_resegment(chan); | |
6485 | ||
6486 | if (!err) | |
6487 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6488 | ||
6489 | return err; | |
6490 | } | |
6491 | ||
d2a7ac5d MM |
6492 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
6493 | { | |
6494 | /* Make sure reqseq is for a packet that has been sent but not acked */ | |
6495 | u16 unacked; | |
6496 | ||
6497 | unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq); | |
6498 | return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked; | |
6499 | } | |
6500 | ||
cec8ab6e MM |
6501 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
6502 | struct sk_buff *skb, u8 event) | |
218bb9df | 6503 | { |
d2a7ac5d MM |
6504 | int err = 0; |
6505 | ||
6506 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan, | |
6507 | control, skb, event, chan->rx_state); | |
6508 | ||
6509 | if (__valid_reqseq(chan, control->reqseq)) { | |
6510 | switch (chan->rx_state) { | |
6511 | case L2CAP_RX_STATE_RECV: | |
6512 | err = l2cap_rx_state_recv(chan, control, skb, event); | |
6513 | break; | |
6514 | case L2CAP_RX_STATE_SREJ_SENT: | |
6515 | err = l2cap_rx_state_srej_sent(chan, control, skb, | |
6516 | event); | |
6517 | break; | |
32b32735 MM |
6518 | case L2CAP_RX_STATE_WAIT_P: |
6519 | err = l2cap_rx_state_wait_p(chan, control, skb, event); | |
6520 | break; | |
6521 | case L2CAP_RX_STATE_WAIT_F: | |
6522 | err = l2cap_rx_state_wait_f(chan, control, skb, event); | |
6523 | break; | |
d2a7ac5d MM |
6524 | default: |
6525 | /* shut it down */ | |
6526 | break; | |
6527 | } | |
6528 | } else { | |
6529 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d", | |
6530 | control->reqseq, chan->next_tx_seq, | |
6531 | chan->expected_ack_seq); | |
5e4e3972 | 6532 | l2cap_send_disconn_req(chan, ECONNRESET); |
d2a7ac5d MM |
6533 | } |
6534 | ||
6535 | return err; | |
cec8ab6e MM |
6536 | } |
6537 | ||
6538 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, | |
6539 | struct sk_buff *skb) | |
6540 | { | |
4b51dae9 MM |
6541 | BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb, |
6542 | chan->rx_state); | |
6543 | ||
6544 | if (l2cap_classify_txseq(chan, control->txseq) == | |
6545 | L2CAP_TXSEQ_EXPECTED) { | |
6546 | l2cap_pass_to_tx(chan, control); | |
6547 | ||
6548 | BT_DBG("buffer_seq %d->%d", chan->buffer_seq, | |
6549 | __next_seq(chan, chan->buffer_seq)); | |
6550 | ||
6551 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); | |
6552 | ||
6553 | l2cap_reassemble_sdu(chan, skb, control); | |
6554 | } else { | |
6555 | if (chan->sdu) { | |
6556 | kfree_skb(chan->sdu); | |
6557 | chan->sdu = NULL; | |
6558 | } | |
6559 | chan->sdu_last_frag = NULL; | |
6560 | chan->sdu_len = 0; | |
6561 | ||
6562 | if (skb) { | |
6563 | BT_DBG("Freeing %p", skb); | |
6564 | kfree_skb(skb); | |
6565 | } | |
6566 | } | |
6567 | ||
6568 | chan->last_acked_seq = control->txseq; | |
6569 | chan->expected_tx_seq = __next_seq(chan, control->txseq); | |
6570 | ||
9a544210 | 6571 | return 0; |
cec8ab6e MM |
6572 | } |
6573 | ||
6574 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) | |
6575 | { | |
a4368ff3 | 6576 | struct l2cap_ctrl *control = &bt_cb(skb)->l2cap; |
cec8ab6e MM |
6577 | u16 len; |
6578 | u8 event; | |
218bb9df | 6579 | |
b76bbd66 MM |
6580 | __unpack_control(chan, skb); |
6581 | ||
218bb9df GP |
6582 | len = skb->len; |
6583 | ||
6584 | /* | |
6585 | * We can just drop the corrupted I-frame here. | |
6586 | * Receiver will miss it and start proper recovery | |
cec8ab6e | 6587 | * procedures and ask for retransmission. |
218bb9df | 6588 | */ |
47d1ec61 | 6589 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
6590 | goto drop; |
6591 | ||
cec8ab6e | 6592 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
03a51213 | 6593 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 6594 | |
47d1ec61 | 6595 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 6596 | len -= L2CAP_FCS_SIZE; |
218bb9df | 6597 | |
47d1ec61 | 6598 | if (len > chan->mps) { |
5e4e3972 | 6599 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6600 | goto drop; |
6601 | } | |
6602 | ||
cec8ab6e MM |
6603 | if (!control->sframe) { |
6604 | int err; | |
218bb9df | 6605 | |
cec8ab6e MM |
6606 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d", |
6607 | control->sar, control->reqseq, control->final, | |
6608 | control->txseq); | |
218bb9df | 6609 | |
cec8ab6e MM |
6610 | /* Validate F-bit - F=0 always valid, F=1 only |
6611 | * valid in TX WAIT_F | |
6612 | */ | |
6613 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) | |
218bb9df | 6614 | goto drop; |
cec8ab6e MM |
6615 | |
6616 | if (chan->mode != L2CAP_MODE_STREAMING) { | |
6617 | event = L2CAP_EV_RECV_IFRAME; | |
6618 | err = l2cap_rx(chan, control, skb, event); | |
6619 | } else { | |
6620 | err = l2cap_stream_rx(chan, control, skb); | |
218bb9df GP |
6621 | } |
6622 | ||
cec8ab6e | 6623 | if (err) |
5e4e3972 | 6624 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df | 6625 | } else { |
cec8ab6e MM |
6626 | const u8 rx_func_to_event[4] = { |
6627 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, | |
6628 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ | |
6629 | }; | |
6630 | ||
6631 | /* Only I-frames are expected in streaming mode */ | |
6632 | if (chan->mode == L2CAP_MODE_STREAMING) | |
6633 | goto drop; | |
6634 | ||
6635 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d", | |
6636 | control->reqseq, control->final, control->poll, | |
6637 | control->super); | |
6638 | ||
218bb9df | 6639 | if (len != 0) { |
1bb166e6 | 6640 | BT_ERR("Trailing bytes: %d in sframe", len); |
5e4e3972 | 6641 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6642 | goto drop; |
6643 | } | |
6644 | ||
cec8ab6e MM |
6645 | /* Validate F and P bits */ |
6646 | if (control->final && (control->poll || | |
6647 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) | |
6648 | goto drop; | |
6649 | ||
6650 | event = rx_func_to_event[control->super]; | |
6651 | if (l2cap_rx(chan, control, skb, event)) | |
5e4e3972 | 6652 | l2cap_send_disconn_req(chan, ECONNRESET); |
218bb9df GP |
6653 | } |
6654 | ||
6655 | return 0; | |
6656 | ||
6657 | drop: | |
6658 | kfree_skb(skb); | |
6659 | return 0; | |
6660 | } | |
6661 | ||
b1c325c2 JH |
6662 | static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) |
6663 | { | |
6664 | struct l2cap_conn *conn = chan->conn; | |
6665 | struct l2cap_le_credits pkt; | |
6666 | u16 return_credits; | |
6667 | ||
6668 | /* We return more credits to the sender only after the amount of | |
6669 | * credits falls below half of the initial amount. | |
6670 | */ | |
f15b8ecf | 6671 | if (chan->rx_credits >= (le_max_credits + 1) / 2) |
b1c325c2 JH |
6672 | return; |
6673 | ||
f15b8ecf | 6674 | return_credits = le_max_credits - chan->rx_credits; |
b1c325c2 JH |
6675 | |
6676 | BT_DBG("chan %p returning %u credits to sender", chan, return_credits); | |
6677 | ||
6678 | chan->rx_credits += return_credits; | |
6679 | ||
6680 | pkt.cid = cpu_to_le16(chan->scid); | |
6681 | pkt.credits = cpu_to_le16(return_credits); | |
6682 | ||
6683 | chan->ident = l2cap_get_ident(conn); | |
6684 | ||
6685 | l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt); | |
6686 | } | |
6687 | ||
fad5fc89 JH |
6688 | static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
6689 | { | |
aac23bf6 JH |
6690 | int err; |
6691 | ||
6692 | if (!chan->rx_credits) { | |
6693 | BT_ERR("No credits to receive LE L2CAP data"); | |
dfd9774c | 6694 | l2cap_send_disconn_req(chan, ECONNRESET); |
fad5fc89 | 6695 | return -ENOBUFS; |
aac23bf6 | 6696 | } |
fad5fc89 | 6697 | |
aac23bf6 JH |
6698 | if (chan->imtu < skb->len) { |
6699 | BT_ERR("Too big LE L2CAP PDU"); | |
fad5fc89 | 6700 | return -ENOBUFS; |
aac23bf6 | 6701 | } |
fad5fc89 JH |
6702 | |
6703 | chan->rx_credits--; | |
6704 | BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits); | |
6705 | ||
6706 | l2cap_chan_le_send_credits(chan); | |
6707 | ||
aac23bf6 JH |
6708 | err = 0; |
6709 | ||
6710 | if (!chan->sdu) { | |
6711 | u16 sdu_len; | |
6712 | ||
6713 | sdu_len = get_unaligned_le16(skb->data); | |
6714 | skb_pull(skb, L2CAP_SDULEN_SIZE); | |
6715 | ||
6716 | BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u", | |
6717 | sdu_len, skb->len, chan->imtu); | |
6718 | ||
6719 | if (sdu_len > chan->imtu) { | |
6720 | BT_ERR("Too big LE L2CAP SDU length received"); | |
6721 | err = -EMSGSIZE; | |
6722 | goto failed; | |
6723 | } | |
6724 | ||
6725 | if (skb->len > sdu_len) { | |
6726 | BT_ERR("Too much LE L2CAP data received"); | |
6727 | err = -EINVAL; | |
6728 | goto failed; | |
6729 | } | |
6730 | ||
6731 | if (skb->len == sdu_len) | |
6732 | return chan->ops->recv(chan, skb); | |
6733 | ||
6734 | chan->sdu = skb; | |
6735 | chan->sdu_len = sdu_len; | |
6736 | chan->sdu_last_frag = skb; | |
6737 | ||
6738 | return 0; | |
6739 | } | |
6740 | ||
6741 | BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u", | |
6742 | chan->sdu->len, skb->len, chan->sdu_len); | |
6743 | ||
6744 | if (chan->sdu->len + skb->len > chan->sdu_len) { | |
6745 | BT_ERR("Too much LE L2CAP data received"); | |
6746 | err = -EINVAL; | |
6747 | goto failed; | |
6748 | } | |
6749 | ||
6750 | append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag); | |
6751 | skb = NULL; | |
6752 | ||
6753 | if (chan->sdu->len == chan->sdu_len) { | |
6754 | err = chan->ops->recv(chan, chan->sdu); | |
6755 | if (!err) { | |
6756 | chan->sdu = NULL; | |
6757 | chan->sdu_last_frag = NULL; | |
6758 | chan->sdu_len = 0; | |
6759 | } | |
6760 | } | |
6761 | ||
6762 | failed: | |
6763 | if (err) { | |
6764 | kfree_skb(skb); | |
6765 | kfree_skb(chan->sdu); | |
6766 | chan->sdu = NULL; | |
6767 | chan->sdu_last_frag = NULL; | |
6768 | chan->sdu_len = 0; | |
6769 | } | |
6770 | ||
6771 | /* We can't return an error here since we took care of the skb | |
6772 | * freeing internally. An error return would cause the caller to | |
6773 | * do a double-free of the skb. | |
6774 | */ | |
6775 | return 0; | |
fad5fc89 JH |
6776 | } |
6777 | ||
13ca56e0 AE |
6778 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
6779 | struct sk_buff *skb) | |
1da177e4 | 6780 | { |
48454079 | 6781 | struct l2cap_chan *chan; |
1da177e4 | 6782 | |
baa7e1fa | 6783 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 6784 | if (!chan) { |
97e8e89d AE |
6785 | if (cid == L2CAP_CID_A2MP) { |
6786 | chan = a2mp_channel_create(conn, skb); | |
6787 | if (!chan) { | |
6788 | kfree_skb(skb); | |
13ca56e0 | 6789 | return; |
97e8e89d AE |
6790 | } |
6791 | ||
6792 | l2cap_chan_lock(chan); | |
6793 | } else { | |
6794 | BT_DBG("unknown cid 0x%4.4x", cid); | |
6795 | /* Drop packet and return */ | |
6796 | kfree_skb(skb); | |
13ca56e0 | 6797 | return; |
97e8e89d | 6798 | } |
1da177e4 LT |
6799 | } |
6800 | ||
49208c9c | 6801 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6802 | |
315917e0 JH |
6803 | /* If we receive data on a fixed channel before the info req/rsp |
6804 | * procdure is done simply assume that the channel is supported | |
6805 | * and mark it as ready. | |
6806 | */ | |
6807 | if (chan->chan_type == L2CAP_CHAN_FIXED) | |
6808 | l2cap_chan_ready(chan); | |
6809 | ||
89bc500e | 6810 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
6811 | goto drop; |
6812 | ||
0c1bc5c6 | 6813 | switch (chan->mode) { |
38319713 | 6814 | case L2CAP_MODE_LE_FLOWCTL: |
fad5fc89 JH |
6815 | if (l2cap_le_data_rcv(chan, skb) < 0) |
6816 | goto drop; | |
6817 | ||
6818 | goto done; | |
6819 | ||
1c2acffb GP |
6820 | case L2CAP_MODE_BASIC: |
6821 | /* If socket recv buffers overflows we drop data here | |
6822 | * which is *bad* because L2CAP has to be reliable. | |
6823 | * But we don't have any other choice. L2CAP doesn't | |
6824 | * provide flow control mechanism. */ | |
1da177e4 | 6825 | |
2c96e03d SJ |
6826 | if (chan->imtu < skb->len) { |
6827 | BT_ERR("Dropping L2CAP data: receive buffer overflow"); | |
1c2acffb | 6828 | goto drop; |
2c96e03d | 6829 | } |
1da177e4 | 6830 | |
80b98027 | 6831 | if (!chan->ops->recv(chan, skb)) |
1c2acffb GP |
6832 | goto done; |
6833 | break; | |
6834 | ||
6835 | case L2CAP_MODE_ERTM: | |
6840ed07 | 6836 | case L2CAP_MODE_STREAMING: |
cec8ab6e | 6837 | l2cap_data_rcv(chan, skb); |
6840ed07 GP |
6838 | goto done; |
6839 | ||
1c2acffb | 6840 | default: |
0c1bc5c6 | 6841 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
6842 | break; |
6843 | } | |
1da177e4 LT |
6844 | |
6845 | drop: | |
6846 | kfree_skb(skb); | |
6847 | ||
6848 | done: | |
6be36555 | 6849 | l2cap_chan_unlock(chan); |
1da177e4 LT |
6850 | } |
6851 | ||
84104b24 AE |
6852 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
6853 | struct sk_buff *skb) | |
1da177e4 | 6854 | { |
ae4fd2d3 | 6855 | struct hci_conn *hcon = conn->hcon; |
23691d75 | 6856 | struct l2cap_chan *chan; |
1da177e4 | 6857 | |
ae4fd2d3 | 6858 | if (hcon->type != ACL_LINK) |
a24cce14 | 6859 | goto free_skb; |
ae4fd2d3 | 6860 | |
bf20fd4e JH |
6861 | chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst, |
6862 | ACL_LINK); | |
23691d75 | 6863 | if (!chan) |
a24cce14 | 6864 | goto free_skb; |
1da177e4 | 6865 | |
5b4cedaa | 6866 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 6867 | |
89bc500e | 6868 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
6869 | goto drop; |
6870 | ||
e13e21dc | 6871 | if (chan->imtu < skb->len) |
1da177e4 LT |
6872 | goto drop; |
6873 | ||
2edf870d | 6874 | /* Store remote BD_ADDR and PSM for msg_name */ |
a4368ff3 JH |
6875 | bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst); |
6876 | bt_cb(skb)->l2cap.psm = psm; | |
2edf870d | 6877 | |
a24cce14 JH |
6878 | if (!chan->ops->recv(chan, skb)) { |
6879 | l2cap_chan_put(chan); | |
84104b24 | 6880 | return; |
a24cce14 | 6881 | } |
1da177e4 LT |
6882 | |
6883 | drop: | |
a24cce14 JH |
6884 | l2cap_chan_put(chan); |
6885 | free_skb: | |
1da177e4 | 6886 | kfree_skb(skb); |
1da177e4 LT |
6887 | } |
6888 | ||
6889 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
6890 | { | |
6891 | struct l2cap_hdr *lh = (void *) skb->data; | |
61a939c6 | 6892 | struct hci_conn *hcon = conn->hcon; |
8e036fc3 AV |
6893 | u16 cid, len; |
6894 | __le16 psm; | |
1da177e4 | 6895 | |
61a939c6 JH |
6896 | if (hcon->state != BT_CONNECTED) { |
6897 | BT_DBG("queueing pending rx skb"); | |
6898 | skb_queue_tail(&conn->pending_rx, skb); | |
6899 | return; | |
6900 | } | |
6901 | ||
1da177e4 LT |
6902 | skb_pull(skb, L2CAP_HDR_SIZE); |
6903 | cid = __le16_to_cpu(lh->cid); | |
6904 | len = __le16_to_cpu(lh->len); | |
6905 | ||
1c2acffb GP |
6906 | if (len != skb->len) { |
6907 | kfree_skb(skb); | |
6908 | return; | |
6909 | } | |
6910 | ||
9e1d7e15 JH |
6911 | /* Since we can't actively block incoming LE connections we must |
6912 | * at least ensure that we ignore incoming data from them. | |
6913 | */ | |
6914 | if (hcon->type == LE_LINK && | |
dcc36c16 | 6915 | hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst, |
a250e048 | 6916 | bdaddr_dst_type(hcon))) { |
e493150e JH |
6917 | kfree_skb(skb); |
6918 | return; | |
6919 | } | |
6920 | ||
1da177e4 LT |
6921 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
6922 | ||
6923 | switch (cid) { | |
8db4dc46 | 6924 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
6925 | l2cap_sig_channel(conn, skb); |
6926 | break; | |
6927 | ||
8db4dc46 | 6928 | case L2CAP_CID_CONN_LESS: |
097db76c | 6929 | psm = get_unaligned((__le16 *) skb->data); |
0181a70f | 6930 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
1da177e4 LT |
6931 | l2cap_conless_channel(conn, psm, skb); |
6932 | break; | |
6933 | ||
a2877629 MH |
6934 | case L2CAP_CID_LE_SIGNALING: |
6935 | l2cap_le_sig_channel(conn, skb); | |
6936 | break; | |
6937 | ||
1da177e4 LT |
6938 | default: |
6939 | l2cap_data_channel(conn, cid, skb); | |
6940 | break; | |
6941 | } | |
6942 | } | |
6943 | ||
61a939c6 JH |
6944 | static void process_pending_rx(struct work_struct *work) |
6945 | { | |
6946 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, | |
6947 | pending_rx_work); | |
6948 | struct sk_buff *skb; | |
6949 | ||
6950 | BT_DBG(""); | |
6951 | ||
6952 | while ((skb = skb_dequeue(&conn->pending_rx))) | |
6953 | l2cap_recv_frame(conn, skb); | |
6954 | } | |
6955 | ||
162b49e7 JH |
6956 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
6957 | { | |
6958 | struct l2cap_conn *conn = hcon->l2cap_data; | |
6959 | struct hci_chan *hchan; | |
6960 | ||
6961 | if (conn) | |
6962 | return conn; | |
6963 | ||
6964 | hchan = hci_chan_create(hcon); | |
6965 | if (!hchan) | |
6966 | return NULL; | |
6967 | ||
27f70f3e | 6968 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); |
162b49e7 JH |
6969 | if (!conn) { |
6970 | hci_chan_del(hchan); | |
6971 | return NULL; | |
6972 | } | |
6973 | ||
6974 | kref_init(&conn->ref); | |
6975 | hcon->l2cap_data = conn; | |
51bb8457 | 6976 | conn->hcon = hci_conn_get(hcon); |
162b49e7 JH |
6977 | conn->hchan = hchan; |
6978 | ||
6979 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); | |
6980 | ||
6981 | switch (hcon->type) { | |
6982 | case LE_LINK: | |
6983 | if (hcon->hdev->le_mtu) { | |
6984 | conn->mtu = hcon->hdev->le_mtu; | |
6985 | break; | |
6986 | } | |
6987 | /* fall through */ | |
6988 | default: | |
6989 | conn->mtu = hcon->hdev->acl_mtu; | |
6990 | break; | |
6991 | } | |
6992 | ||
6993 | conn->feat_mask = 0; | |
6994 | ||
0bd49fc7 JH |
6995 | conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS; |
6996 | ||
6997 | if (hcon->type == ACL_LINK && | |
d7a5a11d | 6998 | hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED)) |
0bd49fc7 | 6999 | conn->local_fixed_chan |= L2CAP_FC_A2MP; |
162b49e7 | 7000 | |
d7a5a11d | 7001 | if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) && |
f9be9e86 | 7002 | (bredr_sc_enabled(hcon->hdev) || |
b7cb93e5 | 7003 | hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP))) |
b5ae344d JH |
7004 | conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR; |
7005 | ||
5a54e7c8 | 7006 | mutex_init(&conn->ident_lock); |
162b49e7 JH |
7007 | mutex_init(&conn->chan_lock); |
7008 | ||
7009 | INIT_LIST_HEAD(&conn->chan_l); | |
7010 | INIT_LIST_HEAD(&conn->users); | |
7011 | ||
276d8073 | 7012 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
162b49e7 | 7013 | |
61a939c6 JH |
7014 | skb_queue_head_init(&conn->pending_rx); |
7015 | INIT_WORK(&conn->pending_rx_work, process_pending_rx); | |
f3d82d0c | 7016 | INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr); |
61a939c6 | 7017 | |
162b49e7 JH |
7018 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
7019 | ||
7020 | return conn; | |
7021 | } | |
7022 | ||
7023 | static bool is_valid_psm(u16 psm, u8 dst_type) { | |
7024 | if (!psm) | |
7025 | return false; | |
7026 | ||
7027 | if (bdaddr_type_is_le(dst_type)) | |
7028 | return (psm <= 0x00ff); | |
7029 | ||
7030 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
7031 | return ((psm & 0x0101) == 0x0001); | |
7032 | } | |
7033 | ||
7034 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, | |
7035 | bdaddr_t *dst, u8 dst_type) | |
7036 | { | |
7037 | struct l2cap_conn *conn; | |
7038 | struct hci_conn *hcon; | |
7039 | struct hci_dev *hdev; | |
162b49e7 JH |
7040 | int err; |
7041 | ||
7042 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst, | |
7043 | dst_type, __le16_to_cpu(psm)); | |
7044 | ||
7045 | hdev = hci_get_route(dst, &chan->src); | |
7046 | if (!hdev) | |
7047 | return -EHOSTUNREACH; | |
7048 | ||
7049 | hci_dev_lock(hdev); | |
7050 | ||
162b49e7 JH |
7051 | if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && |
7052 | chan->chan_type != L2CAP_CHAN_RAW) { | |
7053 | err = -EINVAL; | |
7054 | goto done; | |
7055 | } | |
7056 | ||
21626e62 JH |
7057 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { |
7058 | err = -EINVAL; | |
7059 | goto done; | |
7060 | } | |
7061 | ||
7062 | if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { | |
162b49e7 JH |
7063 | err = -EINVAL; |
7064 | goto done; | |
7065 | } | |
7066 | ||
7067 | switch (chan->mode) { | |
7068 | case L2CAP_MODE_BASIC: | |
7069 | break; | |
7070 | case L2CAP_MODE_LE_FLOWCTL: | |
7071 | l2cap_le_flowctl_init(chan); | |
7072 | break; | |
7073 | case L2CAP_MODE_ERTM: | |
7074 | case L2CAP_MODE_STREAMING: | |
7075 | if (!disable_ertm) | |
7076 | break; | |
7077 | /* fall through */ | |
7078 | default: | |
beb19e4c | 7079 | err = -EOPNOTSUPP; |
162b49e7 JH |
7080 | goto done; |
7081 | } | |
7082 | ||
7083 | switch (chan->state) { | |
7084 | case BT_CONNECT: | |
7085 | case BT_CONNECT2: | |
7086 | case BT_CONFIG: | |
7087 | /* Already connecting */ | |
7088 | err = 0; | |
7089 | goto done; | |
7090 | ||
7091 | case BT_CONNECTED: | |
7092 | /* Already connected */ | |
7093 | err = -EISCONN; | |
7094 | goto done; | |
7095 | ||
7096 | case BT_OPEN: | |
7097 | case BT_BOUND: | |
7098 | /* Can connect */ | |
7099 | break; | |
7100 | ||
7101 | default: | |
7102 | err = -EBADFD; | |
7103 | goto done; | |
7104 | } | |
7105 | ||
7106 | /* Set destination address and psm */ | |
7107 | bacpy(&chan->dst, dst); | |
7108 | chan->dst_type = dst_type; | |
7109 | ||
7110 | chan->psm = psm; | |
7111 | chan->dcid = cid; | |
7112 | ||
6f77d8c7 AG |
7113 | if (bdaddr_type_is_le(dst_type)) { |
7114 | /* Convert from L2CAP channel address type to HCI address type | |
7115 | */ | |
7116 | if (dst_type == BDADDR_LE_PUBLIC) | |
7117 | dst_type = ADDR_LE_DEV_PUBLIC; | |
7118 | else | |
7119 | dst_type = ADDR_LE_DEV_RANDOM; | |
7120 | ||
d7a5a11d | 7121 | if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) |
0ad06aa6 JH |
7122 | hcon = hci_connect_le(hdev, dst, dst_type, |
7123 | chan->sec_level, | |
7124 | HCI_LE_CONN_TIMEOUT, | |
7125 | HCI_ROLE_SLAVE); | |
e804d25d | 7126 | else |
0ad06aa6 JH |
7127 | hcon = hci_connect_le_scan(hdev, dst, dst_type, |
7128 | chan->sec_level, | |
7129 | HCI_LE_CONN_TIMEOUT); | |
cdd6275e | 7130 | |
6f77d8c7 | 7131 | } else { |
d93375a8 | 7132 | u8 auth_type = l2cap_get_auth_type(chan); |
04a6c589 | 7133 | hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type); |
6f77d8c7 | 7134 | } |
162b49e7 JH |
7135 | |
7136 | if (IS_ERR(hcon)) { | |
7137 | err = PTR_ERR(hcon); | |
7138 | goto done; | |
7139 | } | |
7140 | ||
7141 | conn = l2cap_conn_add(hcon); | |
7142 | if (!conn) { | |
7143 | hci_conn_drop(hcon); | |
7144 | err = -ENOMEM; | |
7145 | goto done; | |
7146 | } | |
7147 | ||
02e246ae JH |
7148 | mutex_lock(&conn->chan_lock); |
7149 | l2cap_chan_lock(chan); | |
7150 | ||
162b49e7 JH |
7151 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { |
7152 | hci_conn_drop(hcon); | |
7153 | err = -EBUSY; | |
02e246ae | 7154 | goto chan_unlock; |
162b49e7 JH |
7155 | } |
7156 | ||
7157 | /* Update source addr of the socket */ | |
7158 | bacpy(&chan->src, &hcon->src); | |
a250e048 | 7159 | chan->src_type = bdaddr_src_type(hcon); |
162b49e7 | 7160 | |
02e246ae | 7161 | __l2cap_chan_add(conn, chan); |
162b49e7 JH |
7162 | |
7163 | /* l2cap_chan_add takes its own ref so we can drop this one */ | |
7164 | hci_conn_drop(hcon); | |
7165 | ||
7166 | l2cap_state_change(chan, BT_CONNECT); | |
7167 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); | |
7168 | ||
61202e4d JH |
7169 | /* Release chan->sport so that it can be reused by other |
7170 | * sockets (as it's only used for listening sockets). | |
7171 | */ | |
7172 | write_lock(&chan_list_lock); | |
7173 | chan->sport = 0; | |
7174 | write_unlock(&chan_list_lock); | |
7175 | ||
162b49e7 JH |
7176 | if (hcon->state == BT_CONNECTED) { |
7177 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { | |
7178 | __clear_chan_timer(chan); | |
e7cafc45 | 7179 | if (l2cap_chan_check_security(chan, true)) |
162b49e7 JH |
7180 | l2cap_state_change(chan, BT_CONNECTED); |
7181 | } else | |
7182 | l2cap_do_start(chan); | |
7183 | } | |
7184 | ||
7185 | err = 0; | |
7186 | ||
02e246ae | 7187 | chan_unlock: |
162b49e7 | 7188 | l2cap_chan_unlock(chan); |
02e246ae JH |
7189 | mutex_unlock(&conn->chan_lock); |
7190 | done: | |
162b49e7 JH |
7191 | hci_dev_unlock(hdev); |
7192 | hci_dev_put(hdev); | |
7193 | return err; | |
7194 | } | |
6b8d4a6a | 7195 | EXPORT_SYMBOL_GPL(l2cap_chan_connect); |
162b49e7 | 7196 | |
1da177e4 LT |
7197 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
7198 | ||
686ebf28 | 7199 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
7200 | { |
7201 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 7202 | struct l2cap_chan *c; |
1da177e4 | 7203 | |
6ed93dc6 | 7204 | BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); |
1da177e4 LT |
7205 | |
7206 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
7207 | read_lock(&chan_list_lock); |
7208 | list_for_each_entry(c, &chan_list, global_l) { | |
89bc500e | 7209 | if (c->state != BT_LISTEN) |
1da177e4 LT |
7210 | continue; |
7211 | ||
7eafc59e | 7212 | if (!bacmp(&c->src, &hdev->bdaddr)) { |
2af6b9d5 | 7213 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 7214 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 7215 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 7216 | exact++; |
7eafc59e | 7217 | } else if (!bacmp(&c->src, BDADDR_ANY)) { |
2af6b9d5 | 7218 | lm2 |= HCI_LM_ACCEPT; |
43bd0f32 | 7219 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
7220 | lm2 |= HCI_LM_MASTER; |
7221 | } | |
1da177e4 | 7222 | } |
23691d75 | 7223 | read_unlock(&chan_list_lock); |
1da177e4 LT |
7224 | |
7225 | return exact ? lm1 : lm2; | |
7226 | } | |
7227 | ||
e760ec12 JH |
7228 | /* Find the next fixed channel in BT_LISTEN state, continue iteration |
7229 | * from an existing channel in the list or from the beginning of the | |
7230 | * global list (by passing NULL as first parameter). | |
7231 | */ | |
7232 | static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c, | |
327a7191 | 7233 | struct hci_conn *hcon) |
e760ec12 | 7234 | { |
327a7191 JH |
7235 | u8 src_type = bdaddr_src_type(hcon); |
7236 | ||
e760ec12 JH |
7237 | read_lock(&chan_list_lock); |
7238 | ||
7239 | if (c) | |
7240 | c = list_next_entry(c, global_l); | |
7241 | else | |
7242 | c = list_entry(chan_list.next, typeof(*c), global_l); | |
7243 | ||
7244 | list_for_each_entry_from(c, &chan_list, global_l) { | |
7245 | if (c->chan_type != L2CAP_CHAN_FIXED) | |
7246 | continue; | |
7247 | if (c->state != BT_LISTEN) | |
7248 | continue; | |
327a7191 | 7249 | if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY)) |
54a1b626 | 7250 | continue; |
327a7191 | 7251 | if (src_type != c->src_type) |
54a1b626 | 7252 | continue; |
e760ec12 JH |
7253 | |
7254 | l2cap_chan_hold(c); | |
7255 | read_unlock(&chan_list_lock); | |
7256 | return c; | |
7257 | } | |
7258 | ||
7259 | read_unlock(&chan_list_lock); | |
7260 | ||
7261 | return NULL; | |
7262 | } | |
7263 | ||
539c496d | 7264 | static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 7265 | { |
e760ec12 | 7266 | struct hci_dev *hdev = hcon->hdev; |
0139418c | 7267 | struct l2cap_conn *conn; |
e760ec12 JH |
7268 | struct l2cap_chan *pchan; |
7269 | u8 dst_type; | |
0139418c | 7270 | |
539c496d JH |
7271 | if (hcon->type != ACL_LINK && hcon->type != LE_LINK) |
7272 | return; | |
7273 | ||
6ed93dc6 | 7274 | BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); |
1da177e4 | 7275 | |
dc0f5088 | 7276 | if (status) { |
e175072f | 7277 | l2cap_conn_del(hcon, bt_to_errno(status)); |
dc0f5088 | 7278 | return; |
ba6fc317 | 7279 | } |
dc0f5088 JH |
7280 | |
7281 | conn = l2cap_conn_add(hcon); | |
7282 | if (!conn) | |
7283 | return; | |
7284 | ||
a250e048 | 7285 | dst_type = bdaddr_dst_type(hcon); |
e760ec12 JH |
7286 | |
7287 | /* If device is blocked, do not create channels for it */ | |
7288 | if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type)) | |
7289 | return; | |
7290 | ||
7291 | /* Find fixed channels and notify them of the new connection. We | |
7292 | * use multiple individual lookups, continuing each time where | |
7293 | * we left off, because the list lock would prevent calling the | |
7294 | * potentially sleeping l2cap_chan_lock() function. | |
7295 | */ | |
327a7191 | 7296 | pchan = l2cap_global_fixed_chan(NULL, hcon); |
e760ec12 JH |
7297 | while (pchan) { |
7298 | struct l2cap_chan *chan, *next; | |
7299 | ||
7300 | /* Client fixed channels should override server ones */ | |
7301 | if (__l2cap_get_chan_by_dcid(conn, pchan->scid)) | |
7302 | goto next; | |
7303 | ||
7304 | l2cap_chan_lock(pchan); | |
7305 | chan = pchan->ops->new_connection(pchan); | |
7306 | if (chan) { | |
7307 | bacpy(&chan->src, &hcon->src); | |
7308 | bacpy(&chan->dst, &hcon->dst); | |
a250e048 | 7309 | chan->src_type = bdaddr_src_type(hcon); |
e760ec12 JH |
7310 | chan->dst_type = dst_type; |
7311 | ||
7312 | __l2cap_chan_add(conn, chan); | |
7313 | } | |
7314 | ||
7315 | l2cap_chan_unlock(pchan); | |
7316 | next: | |
327a7191 | 7317 | next = l2cap_global_fixed_chan(pchan, hcon); |
e760ec12 JH |
7318 | l2cap_chan_put(pchan); |
7319 | pchan = next; | |
7320 | } | |
7321 | ||
dc0f5088 | 7322 | l2cap_conn_ready(conn); |
1da177e4 LT |
7323 | } |
7324 | ||
686ebf28 | 7325 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
7326 | { |
7327 | struct l2cap_conn *conn = hcon->l2cap_data; | |
7328 | ||
7329 | BT_DBG("hcon %p", hcon); | |
7330 | ||
686ebf28 | 7331 | if (!conn) |
9f5a0d7b | 7332 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
7333 | return conn->disc_reason; |
7334 | } | |
7335 | ||
3a6d576b | 7336 | static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 | 7337 | { |
3a6d576b JH |
7338 | if (hcon->type != ACL_LINK && hcon->type != LE_LINK) |
7339 | return; | |
7340 | ||
1da177e4 LT |
7341 | BT_DBG("hcon %p reason %d", hcon, reason); |
7342 | ||
e175072f | 7343 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
7344 | } |
7345 | ||
4343478f | 7346 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 7347 | { |
715ec005 | 7348 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
7349 | return; |
7350 | ||
f62e4323 | 7351 | if (encrypt == 0x00) { |
4343478f | 7352 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 7353 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
7d513e92 MH |
7354 | } else if (chan->sec_level == BT_SECURITY_HIGH || |
7355 | chan->sec_level == BT_SECURITY_FIPS) | |
0f852724 | 7356 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 7357 | } else { |
4343478f | 7358 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 7359 | __clear_chan_timer(chan); |
f62e4323 MH |
7360 | } |
7361 | } | |
7362 | ||
354fe804 | 7363 | static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 7364 | { |
0139418c | 7365 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 7366 | struct l2cap_chan *chan; |
1da177e4 | 7367 | |
0139418c | 7368 | if (!conn) |
354fe804 | 7369 | return; |
0139418c | 7370 | |
89d8b407 | 7371 | BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt); |
1da177e4 | 7372 | |
3df91ea2 | 7373 | mutex_lock(&conn->chan_lock); |
1da177e4 | 7374 | |
3df91ea2 | 7375 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 7376 | l2cap_chan_lock(chan); |
1da177e4 | 7377 | |
89d8b407 AE |
7378 | BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid, |
7379 | state_to_string(chan->state)); | |
f1cb9af5 | 7380 | |
2338a7e0 | 7381 | if (chan->scid == L2CAP_CID_A2MP) { |
78eb2f98 AE |
7382 | l2cap_chan_unlock(chan); |
7383 | continue; | |
7384 | } | |
7385 | ||
191eb398 JH |
7386 | if (!status && encrypt) |
7387 | chan->sec_level = hcon->sec_level; | |
f1cb9af5 | 7388 | |
96eff46e | 7389 | if (!__l2cap_no_conn_pending(chan)) { |
6be36555 | 7390 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
7391 | continue; |
7392 | } | |
7393 | ||
89bc500e | 7394 | if (!status && (chan->state == BT_CONNECTED || |
2d792818 | 7395 | chan->state == BT_CONFIG)) { |
d97c899b | 7396 | chan->ops->resume(chan); |
4343478f | 7397 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 7398 | l2cap_chan_unlock(chan); |
9719f8af MH |
7399 | continue; |
7400 | } | |
7401 | ||
89bc500e | 7402 | if (chan->state == BT_CONNECT) { |
6d3c15da | 7403 | if (!status) |
93c3e8f5 | 7404 | l2cap_start_connection(chan); |
6d3c15da | 7405 | else |
ba13ccd9 | 7406 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
fa37c1aa JH |
7407 | } else if (chan->state == BT_CONNECT2 && |
7408 | chan->mode != L2CAP_MODE_LE_FLOWCTL) { | |
b1235d79 | 7409 | struct l2cap_conn_rsp rsp; |
df3c3931 | 7410 | __u16 res, stat; |
1da177e4 | 7411 | |
b1235d79 | 7412 | if (!status) { |
bdc25783 | 7413 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
df3c3931 JH |
7414 | res = L2CAP_CR_PEND; |
7415 | stat = L2CAP_CS_AUTHOR_PEND; | |
2dc4e510 | 7416 | chan->ops->defer(chan); |
df3c3931 | 7417 | } else { |
acdcabf5 | 7418 | l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
7419 | res = L2CAP_CR_SUCCESS; |
7420 | stat = L2CAP_CS_NO_INFO; | |
7421 | } | |
b1235d79 | 7422 | } else { |
acdcabf5 | 7423 | l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 7424 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
7425 | res = L2CAP_CR_SEC_BLOCK; |
7426 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
7427 | } |
7428 | ||
fe4128e0 GP |
7429 | rsp.scid = cpu_to_le16(chan->dcid); |
7430 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
7431 | rsp.result = cpu_to_le16(res); |
7432 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e | 7433 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
2d792818 | 7434 | sizeof(rsp), &rsp); |
2d369359 MM |
7435 | |
7436 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && | |
7437 | res == L2CAP_CR_SUCCESS) { | |
7438 | char buf[128]; | |
7439 | set_bit(CONF_REQ_SENT, &chan->conf_state); | |
7440 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
7441 | L2CAP_CONF_REQ, | |
7442 | l2cap_build_conf_req(chan, buf), | |
7443 | buf); | |
7444 | chan->num_conf_req++; | |
7445 | } | |
b1235d79 | 7446 | } |
1da177e4 | 7447 | |
6be36555 | 7448 | l2cap_chan_unlock(chan); |
1da177e4 LT |
7449 | } |
7450 | ||
3df91ea2 | 7451 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
7452 | } |
7453 | ||
9b4c3336 | 7454 | void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
7455 | { |
7456 | struct l2cap_conn *conn = hcon->l2cap_data; | |
d73a0988 AE |
7457 | struct l2cap_hdr *hdr; |
7458 | int len; | |
1da177e4 | 7459 | |
1d13a254 AE |
7460 | /* For AMP controller do not create l2cap conn */ |
7461 | if (!conn && hcon->hdev->dev_type != HCI_BREDR) | |
7462 | goto drop; | |
1da177e4 | 7463 | |
5a08ecce | 7464 | if (!conn) |
baf43251 | 7465 | conn = l2cap_conn_add(hcon); |
5a08ecce AE |
7466 | |
7467 | if (!conn) | |
1da177e4 LT |
7468 | goto drop; |
7469 | ||
7470 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
7471 | ||
d73a0988 AE |
7472 | switch (flags) { |
7473 | case ACL_START: | |
7474 | case ACL_START_NO_FLUSH: | |
7475 | case ACL_COMPLETE: | |
1da177e4 LT |
7476 | if (conn->rx_len) { |
7477 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
7478 | kfree_skb(conn->rx_skb); | |
7479 | conn->rx_skb = NULL; | |
7480 | conn->rx_len = 0; | |
7481 | l2cap_conn_unreliable(conn, ECOMM); | |
7482 | } | |
7483 | ||
aae7fe22 AE |
7484 | /* Start fragment always begin with Basic L2CAP header */ |
7485 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
7486 | BT_ERR("Frame is too short (len %d)", skb->len); |
7487 | l2cap_conn_unreliable(conn, ECOMM); | |
7488 | goto drop; | |
7489 | } | |
7490 | ||
7491 | hdr = (struct l2cap_hdr *) skb->data; | |
7492 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
7493 | ||
7494 | if (len == skb->len) { | |
7495 | /* Complete frame received */ | |
7496 | l2cap_recv_frame(conn, skb); | |
9b4c3336 | 7497 | return; |
1da177e4 LT |
7498 | } |
7499 | ||
7500 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
7501 | ||
7502 | if (skb->len > len) { | |
7503 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2d792818 | 7504 | skb->len, len); |
1da177e4 LT |
7505 | l2cap_conn_unreliable(conn, ECOMM); |
7506 | goto drop; | |
7507 | } | |
7508 | ||
7509 | /* Allocate skb for the complete frame (with header) */ | |
8bcde1f2 | 7510 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
af05b30b | 7511 | if (!conn->rx_skb) |
1da177e4 LT |
7512 | goto drop; |
7513 | ||
d626f62b | 7514 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7515 | skb->len); |
1da177e4 | 7516 | conn->rx_len = len - skb->len; |
d73a0988 AE |
7517 | break; |
7518 | ||
7519 | case ACL_CONT: | |
1da177e4 LT |
7520 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
7521 | ||
7522 | if (!conn->rx_len) { | |
7523 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
7524 | l2cap_conn_unreliable(conn, ECOMM); | |
7525 | goto drop; | |
7526 | } | |
7527 | ||
7528 | if (skb->len > conn->rx_len) { | |
7529 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2d792818 | 7530 | skb->len, conn->rx_len); |
1da177e4 LT |
7531 | kfree_skb(conn->rx_skb); |
7532 | conn->rx_skb = NULL; | |
7533 | conn->rx_len = 0; | |
7534 | l2cap_conn_unreliable(conn, ECOMM); | |
7535 | goto drop; | |
7536 | } | |
7537 | ||
d626f62b | 7538 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2d792818 | 7539 | skb->len); |
1da177e4 LT |
7540 | conn->rx_len -= skb->len; |
7541 | ||
7542 | if (!conn->rx_len) { | |
c4e5bafa JH |
7543 | /* Complete frame received. l2cap_recv_frame |
7544 | * takes ownership of the skb so set the global | |
7545 | * rx_skb pointer to NULL first. | |
7546 | */ | |
7547 | struct sk_buff *rx_skb = conn->rx_skb; | |
1da177e4 | 7548 | conn->rx_skb = NULL; |
c4e5bafa | 7549 | l2cap_recv_frame(conn, rx_skb); |
1da177e4 | 7550 | } |
d73a0988 | 7551 | break; |
1da177e4 LT |
7552 | } |
7553 | ||
7554 | drop: | |
7555 | kfree_skb(skb); | |
1da177e4 LT |
7556 | } |
7557 | ||
354fe804 JH |
7558 | static struct hci_cb l2cap_cb = { |
7559 | .name = "L2CAP", | |
539c496d | 7560 | .connect_cfm = l2cap_connect_cfm, |
3a6d576b | 7561 | .disconn_cfm = l2cap_disconn_cfm, |
354fe804 JH |
7562 | .security_cfm = l2cap_security_cfm, |
7563 | }; | |
7564 | ||
aef7d97c | 7565 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 7566 | { |
23691d75 | 7567 | struct l2cap_chan *c; |
1da177e4 | 7568 | |
333055f2 | 7569 | read_lock(&chan_list_lock); |
1da177e4 | 7570 | |
23691d75 | 7571 | list_for_each_entry(c, &chan_list, global_l) { |
eeb5a067 MH |
7572 | seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
7573 | &c->src, c->src_type, &c->dst, c->dst_type, | |
fcb73338 AE |
7574 | c->state, __le16_to_cpu(c->psm), |
7575 | c->scid, c->dcid, c->imtu, c->omtu, | |
7576 | c->sec_level, c->mode); | |
61e1b4b7 | 7577 | } |
1da177e4 | 7578 | |
333055f2 | 7579 | read_unlock(&chan_list_lock); |
1da177e4 | 7580 | |
aef7d97c | 7581 | return 0; |
1da177e4 LT |
7582 | } |
7583 | ||
aef7d97c MH |
7584 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
7585 | { | |
7586 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
7587 | } | |
7588 | ||
7589 | static const struct file_operations l2cap_debugfs_fops = { | |
7590 | .open = l2cap_debugfs_open, | |
7591 | .read = seq_read, | |
7592 | .llseek = seq_lseek, | |
7593 | .release = single_release, | |
7594 | }; | |
7595 | ||
7596 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 7597 | |
64274518 | 7598 | int __init l2cap_init(void) |
1da177e4 LT |
7599 | { |
7600 | int err; | |
be9d1227 | 7601 | |
bb58f747 | 7602 | err = l2cap_init_sockets(); |
1da177e4 LT |
7603 | if (err < 0) |
7604 | return err; | |
7605 | ||
354fe804 JH |
7606 | hci_register_cb(&l2cap_cb); |
7607 | ||
1120e4bf MH |
7608 | if (IS_ERR_OR_NULL(bt_debugfs)) |
7609 | return 0; | |
7610 | ||
7611 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs, | |
7612 | NULL, &l2cap_debugfs_fops); | |
1da177e4 | 7613 | |
40b9397a | 7614 | debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs, |
f15b8ecf | 7615 | &le_max_credits); |
40b9397a | 7616 | debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs, |
f15b8ecf JH |
7617 | &le_default_mps); |
7618 | ||
1da177e4 | 7619 | return 0; |
1da177e4 LT |
7620 | } |
7621 | ||
64274518 | 7622 | void l2cap_exit(void) |
1da177e4 | 7623 | { |
aef7d97c | 7624 | debugfs_remove(l2cap_debugfs); |
354fe804 | 7625 | hci_unregister_cb(&l2cap_cb); |
bb58f747 | 7626 | l2cap_cleanup_sockets(); |
1da177e4 LT |
7627 | } |
7628 | ||
d1c4a17d GP |
7629 | module_param(disable_ertm, bool, 0644); |
7630 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |