1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated |
4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5 | Copyright (C) 2010 Google Inc. |
6 | Copyright (C) 2011 ProFUSION Embedded Systems |
7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
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 |
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 |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ |
28 | |
29 | /* Bluetooth L2CAP core. */ |
30 | |
31 | #include <linux/module.h> |
32 | |
33 | #include <linux/debugfs.h> |
34 | #include <linux/crc16.h> |
35 | #include <linux/filter.h> |
36 | |
37 | #include <net/bluetooth/bluetooth.h> |
38 | #include <net/bluetooth/hci_core.h> |
39 | #include <net/bluetooth/l2cap.h> |
40 | |
41 | #include "smp.h" |
42 | #include "a2mp.h" |
43 | #include "amp.h" |
44 | |
45 | #define LE_FLOWCTL_MAX_CREDITS 65535 |
46 | |
47 | bool disable_ertm; |
48 | bool enable_ecred = IS_ENABLED(CONFIG_BT_LE_L2CAP_ECRED); |
49 | |
50 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD; |
51 | |
52 | static LIST_HEAD(chan_list); |
53 | static DEFINE_RWLOCK(chan_list_lock); |
54 | |
55 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
56 | u8 code, u8 ident, u16 dlen, void *data); |
57 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
58 | void *data); |
59 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size); |
60 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err); |
61 | |
62 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
63 | struct sk_buff_head *skbs, u8 event); |
64 | static void l2cap_retrans_timeout(struct work_struct *work); |
65 | static void l2cap_monitor_timeout(struct work_struct *work); |
66 | static void l2cap_ack_timeout(struct work_struct *work); |
67 | |
68 | static inline u8 bdaddr_type(u8 link_type, u8 bdaddr_type) |
69 | { |
70 | if (link_type == LE_LINK) { |
71 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) |
72 | return BDADDR_LE_PUBLIC; |
73 | else |
74 | return BDADDR_LE_RANDOM; |
75 | } |
76 | |
77 | return BDADDR_BREDR; |
78 | } |
79 | |
80 | static inline u8 bdaddr_src_type(struct hci_conn *hcon) |
81 | { |
82 | return bdaddr_type(link_type: hcon->type, bdaddr_type: hcon->src_type); |
83 | } |
84 | |
85 | static inline u8 bdaddr_dst_type(struct hci_conn *hcon) |
86 | { |
87 | return bdaddr_type(link_type: hcon->type, bdaddr_type: hcon->dst_type); |
88 | } |
89 | |
90 | /* ---- L2CAP channels ---- */ |
91 | |
92 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
93 | u16 cid) |
94 | { |
95 | struct l2cap_chan *c; |
96 | |
97 | list_for_each_entry(c, &conn->chan_l, list) { |
98 | if (c->dcid == cid) |
99 | return c; |
100 | } |
101 | return NULL; |
102 | } |
103 | |
104 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
105 | u16 cid) |
106 | { |
107 | struct l2cap_chan *c; |
108 | |
109 | list_for_each_entry(c, &conn->chan_l, list) { |
110 | if (c->scid == cid) |
111 | return c; |
112 | } |
113 | return NULL; |
114 | } |
115 | |
116 | /* Find channel with given SCID. |
117 | * Returns a reference locked channel. |
118 | */ |
119 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, |
120 | u16 cid) |
121 | { |
122 | struct l2cap_chan *c; |
123 | |
124 | mutex_lock(&conn->chan_lock); |
125 | c = __l2cap_get_chan_by_scid(conn, cid); |
126 | if (c) { |
127 | /* Only lock if chan reference is not 0 */ |
128 | c = l2cap_chan_hold_unless_zero(c); |
129 | if (c) |
130 | l2cap_chan_lock(chan: c); |
131 | } |
132 | mutex_unlock(lock: &conn->chan_lock); |
133 | |
134 | return c; |
135 | } |
136 | |
137 | /* Find channel with given DCID. |
138 | * Returns a reference locked channel. |
139 | */ |
140 | static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn, |
141 | u16 cid) |
142 | { |
143 | struct l2cap_chan *c; |
144 | |
145 | mutex_lock(&conn->chan_lock); |
146 | c = __l2cap_get_chan_by_dcid(conn, cid); |
147 | if (c) { |
148 | /* Only lock if chan reference is not 0 */ |
149 | c = l2cap_chan_hold_unless_zero(c); |
150 | if (c) |
151 | l2cap_chan_lock(chan: c); |
152 | } |
153 | mutex_unlock(lock: &conn->chan_lock); |
154 | |
155 | return c; |
156 | } |
157 | |
158 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
159 | u8 ident) |
160 | { |
161 | struct l2cap_chan *c; |
162 | |
163 | list_for_each_entry(c, &conn->chan_l, list) { |
164 | if (c->ident == ident) |
165 | return c; |
166 | } |
167 | return NULL; |
168 | } |
169 | |
170 | static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, |
171 | u8 ident) |
172 | { |
173 | struct l2cap_chan *c; |
174 | |
175 | mutex_lock(&conn->chan_lock); |
176 | c = __l2cap_get_chan_by_ident(conn, ident); |
177 | if (c) { |
178 | /* Only lock if chan reference is not 0 */ |
179 | c = l2cap_chan_hold_unless_zero(c); |
180 | if (c) |
181 | l2cap_chan_lock(chan: c); |
182 | } |
183 | mutex_unlock(lock: &conn->chan_lock); |
184 | |
185 | return c; |
186 | } |
187 | |
188 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src, |
189 | u8 src_type) |
190 | { |
191 | struct l2cap_chan *c; |
192 | |
193 | list_for_each_entry(c, &chan_list, global_l) { |
194 | if (src_type == BDADDR_BREDR && c->src_type != BDADDR_BREDR) |
195 | continue; |
196 | |
197 | if (src_type != BDADDR_BREDR && c->src_type == BDADDR_BREDR) |
198 | continue; |
199 | |
200 | if (c->sport == psm && !bacmp(ba1: &c->src, ba2: src)) |
201 | return c; |
202 | } |
203 | return NULL; |
204 | } |
205 | |
206 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) |
207 | { |
208 | int err; |
209 | |
210 | write_lock(&chan_list_lock); |
211 | |
212 | if (psm && __l2cap_global_chan_by_addr(psm, src, src_type: chan->src_type)) { |
213 | err = -EADDRINUSE; |
214 | goto done; |
215 | } |
216 | |
217 | if (psm) { |
218 | chan->psm = psm; |
219 | chan->sport = psm; |
220 | err = 0; |
221 | } else { |
222 | u16 p, start, end, incr; |
223 | |
224 | if (chan->src_type == BDADDR_BREDR) { |
225 | start = L2CAP_PSM_DYN_START; |
226 | end = L2CAP_PSM_AUTO_END; |
227 | incr = 2; |
228 | } else { |
229 | start = L2CAP_PSM_LE_DYN_START; |
230 | end = L2CAP_PSM_LE_DYN_END; |
231 | incr = 1; |
232 | } |
233 | |
234 | err = -EINVAL; |
235 | for (p = start; p <= end; p += incr) |
236 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src, |
237 | src_type: chan->src_type)) { |
238 | chan->psm = cpu_to_le16(p); |
239 | chan->sport = cpu_to_le16(p); |
240 | err = 0; |
241 | break; |
242 | } |
243 | } |
244 | |
245 | done: |
246 | write_unlock(&chan_list_lock); |
247 | return err; |
248 | } |
249 | EXPORT_SYMBOL_GPL(l2cap_add_psm); |
250 | |
251 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) |
252 | { |
253 | write_lock(&chan_list_lock); |
254 | |
255 | /* Override the defaults (which are for conn-oriented) */ |
256 | chan->omtu = L2CAP_DEFAULT_MTU; |
257 | chan->chan_type = L2CAP_CHAN_FIXED; |
258 | |
259 | chan->scid = scid; |
260 | |
261 | write_unlock(&chan_list_lock); |
262 | |
263 | return 0; |
264 | } |
265 | |
266 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
267 | { |
268 | u16 cid, dyn_end; |
269 | |
270 | if (conn->hcon->type == LE_LINK) |
271 | dyn_end = L2CAP_CID_LE_DYN_END; |
272 | else |
273 | dyn_end = L2CAP_CID_DYN_END; |
274 | |
275 | for (cid = L2CAP_CID_DYN_START; cid <= dyn_end; cid++) { |
276 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
277 | return cid; |
278 | } |
279 | |
280 | return 0; |
281 | } |
282 | |
283 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
284 | { |
285 | BT_DBG("chan %p %s -> %s" , chan, state_to_string(chan->state), |
286 | state_to_string(state)); |
287 | |
288 | chan->state = state; |
289 | chan->ops->state_change(chan, state, 0); |
290 | } |
291 | |
292 | static inline void l2cap_state_change_and_error(struct l2cap_chan *chan, |
293 | int state, int err) |
294 | { |
295 | chan->state = state; |
296 | chan->ops->state_change(chan, chan->state, err); |
297 | } |
298 | |
299 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
300 | { |
301 | chan->ops->state_change(chan, chan->state, err); |
302 | } |
303 | |
304 | static void __set_retrans_timer(struct l2cap_chan *chan) |
305 | { |
306 | if (!delayed_work_pending(&chan->monitor_timer) && |
307 | chan->retrans_timeout) { |
308 | l2cap_set_timer(chan, work: &chan->retrans_timer, |
309 | timeout: msecs_to_jiffies(m: chan->retrans_timeout)); |
310 | } |
311 | } |
312 | |
313 | static void __set_monitor_timer(struct l2cap_chan *chan) |
314 | { |
315 | __clear_retrans_timer(chan); |
316 | if (chan->monitor_timeout) { |
317 | l2cap_set_timer(chan, work: &chan->monitor_timer, |
318 | timeout: msecs_to_jiffies(m: chan->monitor_timeout)); |
319 | } |
320 | } |
321 | |
322 | static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head, |
323 | u16 seq) |
324 | { |
325 | struct sk_buff *skb; |
326 | |
327 | skb_queue_walk(head, skb) { |
328 | if (bt_cb(skb)->l2cap.txseq == seq) |
329 | return skb; |
330 | } |
331 | |
332 | return NULL; |
333 | } |
334 | |
335 | /* ---- L2CAP sequence number lists ---- */ |
336 | |
337 | /* For ERTM, ordered lists of sequence numbers must be tracked for |
338 | * SREJ requests that are received and for frames that are to be |
339 | * retransmitted. These seq_list functions implement a singly-linked |
340 | * list in an array, where membership in the list can also be checked |
341 | * in constant time. Items can also be added to the tail of the list |
342 | * and removed from the head in constant time, without further memory |
343 | * allocs or frees. |
344 | */ |
345 | |
346 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) |
347 | { |
348 | size_t alloc_size, i; |
349 | |
350 | /* Allocated size is a power of 2 to map sequence numbers |
351 | * (which may be up to 14 bits) in to a smaller array that is |
352 | * sized for the negotiated ERTM transmit windows. |
353 | */ |
354 | alloc_size = roundup_pow_of_two(size); |
355 | |
356 | seq_list->list = kmalloc_array(n: alloc_size, size: sizeof(u16), GFP_KERNEL); |
357 | if (!seq_list->list) |
358 | return -ENOMEM; |
359 | |
360 | seq_list->mask = alloc_size - 1; |
361 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; |
362 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; |
363 | for (i = 0; i < alloc_size; i++) |
364 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; |
365 | |
366 | return 0; |
367 | } |
368 | |
369 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) |
370 | { |
371 | kfree(objp: seq_list->list); |
372 | } |
373 | |
374 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, |
375 | u16 seq) |
376 | { |
377 | /* Constant-time check for list membership */ |
378 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; |
379 | } |
380 | |
381 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) |
382 | { |
383 | u16 seq = seq_list->head; |
384 | u16 mask = seq_list->mask; |
385 | |
386 | seq_list->head = seq_list->list[seq & mask]; |
387 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; |
388 | |
389 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { |
390 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; |
391 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; |
392 | } |
393 | |
394 | return seq; |
395 | } |
396 | |
397 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) |
398 | { |
399 | u16 i; |
400 | |
401 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
402 | return; |
403 | |
404 | for (i = 0; i <= seq_list->mask; i++) |
405 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; |
406 | |
407 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; |
408 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; |
409 | } |
410 | |
411 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) |
412 | { |
413 | u16 mask = seq_list->mask; |
414 | |
415 | /* All appends happen in constant time */ |
416 | |
417 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
418 | return; |
419 | |
420 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
421 | seq_list->head = seq; |
422 | else |
423 | seq_list->list[seq_list->tail & mask] = seq; |
424 | |
425 | seq_list->tail = seq; |
426 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; |
427 | } |
428 | |
429 | static void l2cap_chan_timeout(struct work_struct *work) |
430 | { |
431 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
432 | chan_timer.work); |
433 | struct l2cap_conn *conn = chan->conn; |
434 | int reason; |
435 | |
436 | BT_DBG("chan %p state %s" , chan, state_to_string(chan->state)); |
437 | |
438 | mutex_lock(&conn->chan_lock); |
439 | /* __set_chan_timer() calls l2cap_chan_hold(chan) while scheduling |
440 | * this work. No need to call l2cap_chan_hold(chan) here again. |
441 | */ |
442 | l2cap_chan_lock(chan); |
443 | |
444 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
445 | reason = ECONNREFUSED; |
446 | else if (chan->state == BT_CONNECT && |
447 | chan->sec_level != BT_SECURITY_SDP) |
448 | reason = ECONNREFUSED; |
449 | else |
450 | reason = ETIMEDOUT; |
451 | |
452 | l2cap_chan_close(chan, reason); |
453 | |
454 | chan->ops->close(chan); |
455 | |
456 | l2cap_chan_unlock(chan); |
457 | l2cap_chan_put(c: chan); |
458 | |
459 | mutex_unlock(lock: &conn->chan_lock); |
460 | } |
461 | |
462 | struct l2cap_chan *l2cap_chan_create(void) |
463 | { |
464 | struct l2cap_chan *chan; |
465 | |
466 | chan = kzalloc(size: sizeof(*chan), GFP_ATOMIC); |
467 | if (!chan) |
468 | return NULL; |
469 | |
470 | skb_queue_head_init(list: &chan->tx_q); |
471 | skb_queue_head_init(list: &chan->srej_q); |
472 | mutex_init(&chan->lock); |
473 | |
474 | /* Set default lock nesting level */ |
475 | atomic_set(v: &chan->nesting, i: L2CAP_NESTING_NORMAL); |
476 | |
477 | write_lock(&chan_list_lock); |
478 | list_add(new: &chan->global_l, head: &chan_list); |
479 | write_unlock(&chan_list_lock); |
480 | |
481 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
482 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
483 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); |
484 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); |
485 | |
486 | chan->state = BT_OPEN; |
487 | |
488 | kref_init(kref: &chan->kref); |
489 | |
490 | /* This flag is cleared in l2cap_chan_ready() */ |
491 | set_bit(nr: CONF_NOT_COMPLETE, addr: &chan->conf_state); |
492 | |
493 | BT_DBG("chan %p" , chan); |
494 | |
495 | return chan; |
496 | } |
497 | EXPORT_SYMBOL_GPL(l2cap_chan_create); |
498 | |
499 | static void l2cap_chan_destroy(struct kref *kref) |
500 | { |
501 | struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref); |
502 | |
503 | BT_DBG("chan %p" , chan); |
504 | |
505 | write_lock(&chan_list_lock); |
506 | list_del(entry: &chan->global_l); |
507 | write_unlock(&chan_list_lock); |
508 | |
509 | kfree(objp: chan); |
510 | } |
511 | |
512 | void l2cap_chan_hold(struct l2cap_chan *c) |
513 | { |
514 | BT_DBG("chan %p orig refcnt %u" , c, kref_read(&c->kref)); |
515 | |
516 | kref_get(kref: &c->kref); |
517 | } |
518 | |
519 | struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c) |
520 | { |
521 | BT_DBG("chan %p orig refcnt %u" , c, kref_read(&c->kref)); |
522 | |
523 | if (!kref_get_unless_zero(kref: &c->kref)) |
524 | return NULL; |
525 | |
526 | return c; |
527 | } |
528 | |
529 | void l2cap_chan_put(struct l2cap_chan *c) |
530 | { |
531 | BT_DBG("chan %p orig refcnt %u" , c, kref_read(&c->kref)); |
532 | |
533 | kref_put(kref: &c->kref, release: l2cap_chan_destroy); |
534 | } |
535 | EXPORT_SYMBOL_GPL(l2cap_chan_put); |
536 | |
537 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
538 | { |
539 | chan->fcs = L2CAP_FCS_CRC16; |
540 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; |
541 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; |
542 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
543 | chan->remote_max_tx = chan->max_tx; |
544 | chan->remote_tx_win = chan->tx_win; |
545 | chan->ack_win = L2CAP_DEFAULT_TX_WINDOW; |
546 | chan->sec_level = BT_SECURITY_LOW; |
547 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
548 | chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; |
549 | chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; |
550 | |
551 | chan->conf_state = 0; |
552 | set_bit(nr: CONF_NOT_COMPLETE, addr: &chan->conf_state); |
553 | |
554 | set_bit(nr: FLAG_FORCE_ACTIVE, addr: &chan->flags); |
555 | } |
556 | EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults); |
557 | |
558 | static void l2cap_le_flowctl_init(struct l2cap_chan *chan, u16 tx_credits) |
559 | { |
560 | chan->sdu = NULL; |
561 | chan->sdu_last_frag = NULL; |
562 | chan->sdu_len = 0; |
563 | chan->tx_credits = tx_credits; |
564 | /* Derive MPS from connection MTU to stop HCI fragmentation */ |
565 | chan->mps = min_t(u16, chan->imtu, chan->conn->mtu - L2CAP_HDR_SIZE); |
566 | /* Give enough credits for a full packet */ |
567 | chan->rx_credits = (chan->imtu / chan->mps) + 1; |
568 | |
569 | skb_queue_head_init(list: &chan->tx_q); |
570 | } |
571 | |
572 | static void l2cap_ecred_init(struct l2cap_chan *chan, u16 tx_credits) |
573 | { |
574 | l2cap_le_flowctl_init(chan, tx_credits); |
575 | |
576 | /* L2CAP implementations shall support a minimum MPS of 64 octets */ |
577 | if (chan->mps < L2CAP_ECRED_MIN_MPS) { |
578 | chan->mps = L2CAP_ECRED_MIN_MPS; |
579 | chan->rx_credits = (chan->imtu / chan->mps) + 1; |
580 | } |
581 | } |
582 | |
583 | void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
584 | { |
585 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x" , conn, |
586 | __le16_to_cpu(chan->psm), chan->dcid); |
587 | |
588 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
589 | |
590 | chan->conn = conn; |
591 | |
592 | switch (chan->chan_type) { |
593 | case L2CAP_CHAN_CONN_ORIENTED: |
594 | /* Alloc CID for connection-oriented socket */ |
595 | chan->scid = l2cap_alloc_cid(conn); |
596 | if (conn->hcon->type == ACL_LINK) |
597 | chan->omtu = L2CAP_DEFAULT_MTU; |
598 | break; |
599 | |
600 | case L2CAP_CHAN_CONN_LESS: |
601 | /* Connectionless socket */ |
602 | chan->scid = L2CAP_CID_CONN_LESS; |
603 | chan->dcid = L2CAP_CID_CONN_LESS; |
604 | chan->omtu = L2CAP_DEFAULT_MTU; |
605 | break; |
606 | |
607 | case L2CAP_CHAN_FIXED: |
608 | /* Caller will set CID and CID specific MTU values */ |
609 | break; |
610 | |
611 | default: |
612 | /* Raw socket can send/recv signalling messages only */ |
613 | chan->scid = L2CAP_CID_SIGNALING; |
614 | chan->dcid = L2CAP_CID_SIGNALING; |
615 | chan->omtu = L2CAP_DEFAULT_MTU; |
616 | } |
617 | |
618 | chan->local_id = L2CAP_BESTEFFORT_ID; |
619 | chan->local_stype = L2CAP_SERV_BESTEFFORT; |
620 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; |
621 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; |
622 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; |
623 | chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO; |
624 | |
625 | l2cap_chan_hold(c: chan); |
626 | |
627 | /* Only keep a reference for fixed channels if they requested it */ |
628 | if (chan->chan_type != L2CAP_CHAN_FIXED || |
629 | test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) |
630 | hci_conn_hold(conn: conn->hcon); |
631 | |
632 | list_add(new: &chan->list, head: &conn->chan_l); |
633 | } |
634 | |
635 | void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
636 | { |
637 | mutex_lock(&conn->chan_lock); |
638 | __l2cap_chan_add(conn, chan); |
639 | mutex_unlock(lock: &conn->chan_lock); |
640 | } |
641 | |
642 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
643 | { |
644 | struct l2cap_conn *conn = chan->conn; |
645 | |
646 | __clear_chan_timer(chan); |
647 | |
648 | BT_DBG("chan %p, conn %p, err %d, state %s" , chan, conn, err, |
649 | state_to_string(chan->state)); |
650 | |
651 | chan->ops->teardown(chan, err); |
652 | |
653 | if (conn) { |
654 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
655 | /* Delete from channel list */ |
656 | list_del(entry: &chan->list); |
657 | |
658 | l2cap_chan_put(chan); |
659 | |
660 | chan->conn = NULL; |
661 | |
662 | /* Reference was only held for non-fixed channels or |
663 | * fixed channels that explicitly requested it using the |
664 | * FLAG_HOLD_HCI_CONN flag. |
665 | */ |
666 | if (chan->chan_type != L2CAP_CHAN_FIXED || |
667 | test_bit(FLAG_HOLD_HCI_CONN, &chan->flags)) |
668 | hci_conn_drop(conn: conn->hcon); |
669 | |
670 | if (mgr && mgr->bredr_chan == chan) |
671 | mgr->bredr_chan = NULL; |
672 | } |
673 | |
674 | if (chan->hs_hchan) { |
675 | struct hci_chan *hs_hchan = chan->hs_hchan; |
676 | |
677 | BT_DBG("chan %p disconnect hs_hchan %p" , chan, hs_hchan); |
678 | amp_disconnect_logical_link(hchan: hs_hchan); |
679 | } |
680 | |
681 | if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state)) |
682 | return; |
683 | |
684 | switch (chan->mode) { |
685 | case L2CAP_MODE_BASIC: |
686 | break; |
687 | |
688 | case L2CAP_MODE_LE_FLOWCTL: |
689 | case L2CAP_MODE_EXT_FLOWCTL: |
690 | skb_queue_purge(list: &chan->tx_q); |
691 | break; |
692 | |
693 | case L2CAP_MODE_ERTM: |
694 | __clear_retrans_timer(chan); |
695 | __clear_monitor_timer(chan); |
696 | __clear_ack_timer(chan); |
697 | |
698 | skb_queue_purge(list: &chan->srej_q); |
699 | |
700 | l2cap_seq_list_free(seq_list: &chan->srej_list); |
701 | l2cap_seq_list_free(seq_list: &chan->retrans_list); |
702 | fallthrough; |
703 | |
704 | case L2CAP_MODE_STREAMING: |
705 | skb_queue_purge(list: &chan->tx_q); |
706 | break; |
707 | } |
708 | } |
709 | EXPORT_SYMBOL_GPL(l2cap_chan_del); |
710 | |
711 | static void __l2cap_chan_list_id(struct l2cap_conn *conn, u16 id, |
712 | l2cap_chan_func_t func, void *data) |
713 | { |
714 | struct l2cap_chan *chan, *l; |
715 | |
716 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
717 | if (chan->ident == id) |
718 | func(chan, data); |
719 | } |
720 | } |
721 | |
722 | static void __l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func, |
723 | void *data) |
724 | { |
725 | struct l2cap_chan *chan; |
726 | |
727 | list_for_each_entry(chan, &conn->chan_l, list) { |
728 | func(chan, data); |
729 | } |
730 | } |
731 | |
732 | void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func, |
733 | void *data) |
734 | { |
735 | if (!conn) |
736 | return; |
737 | |
738 | mutex_lock(&conn->chan_lock); |
739 | __l2cap_chan_list(conn, func, data); |
740 | mutex_unlock(lock: &conn->chan_lock); |
741 | } |
742 | |
743 | EXPORT_SYMBOL_GPL(l2cap_chan_list); |
744 | |
745 | static void l2cap_conn_update_id_addr(struct work_struct *work) |
746 | { |
747 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
748 | id_addr_timer.work); |
749 | struct hci_conn *hcon = conn->hcon; |
750 | struct l2cap_chan *chan; |
751 | |
752 | mutex_lock(&conn->chan_lock); |
753 | |
754 | list_for_each_entry(chan, &conn->chan_l, list) { |
755 | l2cap_chan_lock(chan); |
756 | bacpy(dst: &chan->dst, src: &hcon->dst); |
757 | chan->dst_type = bdaddr_dst_type(hcon); |
758 | l2cap_chan_unlock(chan); |
759 | } |
760 | |
761 | mutex_unlock(lock: &conn->chan_lock); |
762 | } |
763 | |
764 | static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan) |
765 | { |
766 | struct l2cap_conn *conn = chan->conn; |
767 | struct l2cap_le_conn_rsp rsp; |
768 | u16 result; |
769 | |
770 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) |
771 | result = L2CAP_CR_LE_AUTHORIZATION; |
772 | else |
773 | result = L2CAP_CR_LE_BAD_PSM; |
774 | |
775 | l2cap_state_change(chan, state: BT_DISCONN); |
776 | |
777 | rsp.dcid = cpu_to_le16(chan->scid); |
778 | rsp.mtu = cpu_to_le16(chan->imtu); |
779 | rsp.mps = cpu_to_le16(chan->mps); |
780 | rsp.credits = cpu_to_le16(chan->rx_credits); |
781 | rsp.result = cpu_to_le16(result); |
782 | |
783 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_LE_CONN_RSP, len: sizeof(rsp), |
784 | data: &rsp); |
785 | } |
786 | |
787 | static void l2cap_chan_ecred_connect_reject(struct l2cap_chan *chan) |
788 | { |
789 | l2cap_state_change(chan, state: BT_DISCONN); |
790 | |
791 | __l2cap_ecred_conn_rsp_defer(chan); |
792 | } |
793 | |
794 | static void l2cap_chan_connect_reject(struct l2cap_chan *chan) |
795 | { |
796 | struct l2cap_conn *conn = chan->conn; |
797 | struct l2cap_conn_rsp rsp; |
798 | u16 result; |
799 | |
800 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) |
801 | result = L2CAP_CR_SEC_BLOCK; |
802 | else |
803 | result = L2CAP_CR_BAD_PSM; |
804 | |
805 | l2cap_state_change(chan, state: BT_DISCONN); |
806 | |
807 | rsp.scid = cpu_to_le16(chan->dcid); |
808 | rsp.dcid = cpu_to_le16(chan->scid); |
809 | rsp.result = cpu_to_le16(result); |
810 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
811 | |
812 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_CONN_RSP, len: sizeof(rsp), data: &rsp); |
813 | } |
814 | |
815 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
816 | { |
817 | struct l2cap_conn *conn = chan->conn; |
818 | |
819 | BT_DBG("chan %p state %s" , chan, state_to_string(chan->state)); |
820 | |
821 | switch (chan->state) { |
822 | case BT_LISTEN: |
823 | chan->ops->teardown(chan, 0); |
824 | break; |
825 | |
826 | case BT_CONNECTED: |
827 | case BT_CONFIG: |
828 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
829 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
830 | l2cap_send_disconn_req(chan, err: reason); |
831 | } else |
832 | l2cap_chan_del(chan, reason); |
833 | break; |
834 | |
835 | case BT_CONNECT2: |
836 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) { |
837 | if (conn->hcon->type == ACL_LINK) |
838 | l2cap_chan_connect_reject(chan); |
839 | else if (conn->hcon->type == LE_LINK) { |
840 | switch (chan->mode) { |
841 | case L2CAP_MODE_LE_FLOWCTL: |
842 | l2cap_chan_le_connect_reject(chan); |
843 | break; |
844 | case L2CAP_MODE_EXT_FLOWCTL: |
845 | l2cap_chan_ecred_connect_reject(chan); |
846 | return; |
847 | } |
848 | } |
849 | } |
850 | |
851 | l2cap_chan_del(chan, reason); |
852 | break; |
853 | |
854 | case BT_CONNECT: |
855 | case BT_DISCONN: |
856 | l2cap_chan_del(chan, reason); |
857 | break; |
858 | |
859 | default: |
860 | chan->ops->teardown(chan, 0); |
861 | break; |
862 | } |
863 | } |
864 | EXPORT_SYMBOL(l2cap_chan_close); |
865 | |
866 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
867 | { |
868 | switch (chan->chan_type) { |
869 | case L2CAP_CHAN_RAW: |
870 | switch (chan->sec_level) { |
871 | case BT_SECURITY_HIGH: |
872 | case BT_SECURITY_FIPS: |
873 | return HCI_AT_DEDICATED_BONDING_MITM; |
874 | case BT_SECURITY_MEDIUM: |
875 | return HCI_AT_DEDICATED_BONDING; |
876 | default: |
877 | return HCI_AT_NO_BONDING; |
878 | } |
879 | break; |
880 | case L2CAP_CHAN_CONN_LESS: |
881 | if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) { |
882 | if (chan->sec_level == BT_SECURITY_LOW) |
883 | chan->sec_level = BT_SECURITY_SDP; |
884 | } |
885 | if (chan->sec_level == BT_SECURITY_HIGH || |
886 | chan->sec_level == BT_SECURITY_FIPS) |
887 | return HCI_AT_NO_BONDING_MITM; |
888 | else |
889 | return HCI_AT_NO_BONDING; |
890 | break; |
891 | case L2CAP_CHAN_CONN_ORIENTED: |
892 | if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) { |
893 | if (chan->sec_level == BT_SECURITY_LOW) |
894 | chan->sec_level = BT_SECURITY_SDP; |
895 | |
896 | if (chan->sec_level == BT_SECURITY_HIGH || |
897 | chan->sec_level == BT_SECURITY_FIPS) |
898 | return HCI_AT_NO_BONDING_MITM; |
899 | else |
900 | return HCI_AT_NO_BONDING; |
901 | } |
902 | fallthrough; |
903 | |
904 | default: |
905 | switch (chan->sec_level) { |
906 | case BT_SECURITY_HIGH: |
907 | case BT_SECURITY_FIPS: |
908 | return HCI_AT_GENERAL_BONDING_MITM; |
909 | case BT_SECURITY_MEDIUM: |
910 | return HCI_AT_GENERAL_BONDING; |
911 | default: |
912 | return HCI_AT_NO_BONDING; |
913 | } |
914 | break; |
915 | } |
916 | } |
917 | |
918 | /* Service level security */ |
919 | int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator) |
920 | { |
921 | struct l2cap_conn *conn = chan->conn; |
922 | __u8 auth_type; |
923 | |
924 | if (conn->hcon->type == LE_LINK) |
925 | return smp_conn_security(hcon: conn->hcon, sec_level: chan->sec_level); |
926 | |
927 | auth_type = l2cap_get_auth_type(chan); |
928 | |
929 | return hci_conn_security(conn: conn->hcon, sec_level: chan->sec_level, auth_type, |
930 | initiator); |
931 | } |
932 | |
933 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
934 | { |
935 | u8 id; |
936 | |
937 | /* Get next available identificator. |
938 | * 1 - 128 are used by kernel. |
939 | * 129 - 199 are reserved. |
940 | * 200 - 254 are used by utilities like l2ping, etc. |
941 | */ |
942 | |
943 | mutex_lock(&conn->ident_lock); |
944 | |
945 | if (++conn->tx_ident > 128) |
946 | conn->tx_ident = 1; |
947 | |
948 | id = conn->tx_ident; |
949 | |
950 | mutex_unlock(lock: &conn->ident_lock); |
951 | |
952 | return id; |
953 | } |
954 | |
955 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
956 | void *data) |
957 | { |
958 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, dlen: len, data); |
959 | u8 flags; |
960 | |
961 | BT_DBG("code 0x%2.2x" , code); |
962 | |
963 | if (!skb) |
964 | return; |
965 | |
966 | /* Use NO_FLUSH if supported or we have an LE link (which does |
967 | * not support auto-flushing packets) */ |
968 | if (lmp_no_flush_capable(conn->hcon->hdev) || |
969 | conn->hcon->type == LE_LINK) |
970 | flags = ACL_START_NO_FLUSH; |
971 | else |
972 | flags = ACL_START; |
973 | |
974 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
975 | skb->priority = HCI_PRIO_MAX; |
976 | |
977 | hci_send_acl(chan: conn->hchan, skb, flags); |
978 | } |
979 | |
980 | static bool __chan_is_moving(struct l2cap_chan *chan) |
981 | { |
982 | return chan->move_state != L2CAP_MOVE_STABLE && |
983 | chan->move_state != L2CAP_MOVE_WAIT_PREPARE; |
984 | } |
985 | |
986 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
987 | { |
988 | struct hci_conn *hcon = chan->conn->hcon; |
989 | u16 flags; |
990 | |
991 | BT_DBG("chan %p, skb %p len %d priority %u" , chan, skb, skb->len, |
992 | skb->priority); |
993 | |
994 | if (chan->hs_hcon && !__chan_is_moving(chan)) { |
995 | if (chan->hs_hchan) |
996 | hci_send_acl(chan: chan->hs_hchan, skb, ACL_COMPLETE); |
997 | else |
998 | kfree_skb(skb); |
999 | |
1000 | return; |
1001 | } |
1002 | |
1003 | /* Use NO_FLUSH for LE links (where this is the only option) or |
1004 | * if the BR/EDR link supports it and flushing has not been |
1005 | * explicitly requested (through FLAG_FLUSHABLE). |
1006 | */ |
1007 | if (hcon->type == LE_LINK || |
1008 | (!test_bit(FLAG_FLUSHABLE, &chan->flags) && |
1009 | lmp_no_flush_capable(hcon->hdev))) |
1010 | flags = ACL_START_NO_FLUSH; |
1011 | else |
1012 | flags = ACL_START; |
1013 | |
1014 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
1015 | hci_send_acl(chan: chan->conn->hchan, skb, flags); |
1016 | } |
1017 | |
1018 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
1019 | { |
1020 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; |
1021 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; |
1022 | |
1023 | if (enh & L2CAP_CTRL_FRAME_TYPE) { |
1024 | /* S-Frame */ |
1025 | control->sframe = 1; |
1026 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; |
1027 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; |
1028 | |
1029 | control->sar = 0; |
1030 | control->txseq = 0; |
1031 | } else { |
1032 | /* I-Frame */ |
1033 | control->sframe = 0; |
1034 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; |
1035 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; |
1036 | |
1037 | control->poll = 0; |
1038 | control->super = 0; |
1039 | } |
1040 | } |
1041 | |
1042 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
1043 | { |
1044 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; |
1045 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; |
1046 | |
1047 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { |
1048 | /* S-Frame */ |
1049 | control->sframe = 1; |
1050 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; |
1051 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; |
1052 | |
1053 | control->sar = 0; |
1054 | control->txseq = 0; |
1055 | } else { |
1056 | /* I-Frame */ |
1057 | control->sframe = 0; |
1058 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; |
1059 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; |
1060 | |
1061 | control->poll = 0; |
1062 | control->super = 0; |
1063 | } |
1064 | } |
1065 | |
1066 | static inline void __unpack_control(struct l2cap_chan *chan, |
1067 | struct sk_buff *skb) |
1068 | { |
1069 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { |
1070 | __unpack_extended_control(ext: get_unaligned_le32(p: skb->data), |
1071 | control: &bt_cb(skb)->l2cap); |
1072 | skb_pull(skb, L2CAP_EXT_CTRL_SIZE); |
1073 | } else { |
1074 | __unpack_enhanced_control(enh: get_unaligned_le16(p: skb->data), |
1075 | control: &bt_cb(skb)->l2cap); |
1076 | skb_pull(skb, L2CAP_ENH_CTRL_SIZE); |
1077 | } |
1078 | } |
1079 | |
1080 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
1081 | { |
1082 | u32 packed; |
1083 | |
1084 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; |
1085 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; |
1086 | |
1087 | if (control->sframe) { |
1088 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; |
1089 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; |
1090 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; |
1091 | } else { |
1092 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; |
1093 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; |
1094 | } |
1095 | |
1096 | return packed; |
1097 | } |
1098 | |
1099 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) |
1100 | { |
1101 | u16 packed; |
1102 | |
1103 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; |
1104 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; |
1105 | |
1106 | if (control->sframe) { |
1107 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; |
1108 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; |
1109 | packed |= L2CAP_CTRL_FRAME_TYPE; |
1110 | } else { |
1111 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; |
1112 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; |
1113 | } |
1114 | |
1115 | return packed; |
1116 | } |
1117 | |
1118 | static inline void __pack_control(struct l2cap_chan *chan, |
1119 | struct l2cap_ctrl *control, |
1120 | struct sk_buff *skb) |
1121 | { |
1122 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { |
1123 | put_unaligned_le32(val: __pack_extended_control(control), |
1124 | p: skb->data + L2CAP_HDR_SIZE); |
1125 | } else { |
1126 | put_unaligned_le16(val: __pack_enhanced_control(control), |
1127 | p: skb->data + L2CAP_HDR_SIZE); |
1128 | } |
1129 | } |
1130 | |
1131 | static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan) |
1132 | { |
1133 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1134 | return L2CAP_EXT_HDR_SIZE; |
1135 | else |
1136 | return L2CAP_ENH_HDR_SIZE; |
1137 | } |
1138 | |
1139 | static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan, |
1140 | u32 control) |
1141 | { |
1142 | struct sk_buff *skb; |
1143 | struct l2cap_hdr *lh; |
1144 | int hlen = __ertm_hdr_size(chan); |
1145 | |
1146 | if (chan->fcs == L2CAP_FCS_CRC16) |
1147 | hlen += L2CAP_FCS_SIZE; |
1148 | |
1149 | skb = bt_skb_alloc(len: hlen, GFP_KERNEL); |
1150 | |
1151 | if (!skb) |
1152 | return ERR_PTR(error: -ENOMEM); |
1153 | |
1154 | lh = skb_put(skb, L2CAP_HDR_SIZE); |
1155 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1156 | lh->cid = cpu_to_le16(chan->dcid); |
1157 | |
1158 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1159 | put_unaligned_le32(val: control, p: skb_put(skb, L2CAP_EXT_CTRL_SIZE)); |
1160 | else |
1161 | put_unaligned_le16(val: control, p: skb_put(skb, L2CAP_ENH_CTRL_SIZE)); |
1162 | |
1163 | if (chan->fcs == L2CAP_FCS_CRC16) { |
1164 | u16 fcs = crc16(crc: 0, buffer: (u8 *)skb->data, len: skb->len); |
1165 | put_unaligned_le16(val: fcs, p: skb_put(skb, L2CAP_FCS_SIZE)); |
1166 | } |
1167 | |
1168 | skb->priority = HCI_PRIO_MAX; |
1169 | return skb; |
1170 | } |
1171 | |
1172 | static void l2cap_send_sframe(struct l2cap_chan *chan, |
1173 | struct l2cap_ctrl *control) |
1174 | { |
1175 | struct sk_buff *skb; |
1176 | u32 control_field; |
1177 | |
1178 | BT_DBG("chan %p, control %p" , chan, control); |
1179 | |
1180 | if (!control->sframe) |
1181 | return; |
1182 | |
1183 | if (__chan_is_moving(chan)) |
1184 | return; |
1185 | |
1186 | if (test_and_clear_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state) && |
1187 | !control->poll) |
1188 | control->final = 1; |
1189 | |
1190 | if (control->super == L2CAP_SUPER_RR) |
1191 | clear_bit(nr: CONN_RNR_SENT, addr: &chan->conn_state); |
1192 | else if (control->super == L2CAP_SUPER_RNR) |
1193 | set_bit(nr: CONN_RNR_SENT, addr: &chan->conn_state); |
1194 | |
1195 | if (control->super != L2CAP_SUPER_SREJ) { |
1196 | chan->last_acked_seq = control->reqseq; |
1197 | __clear_ack_timer(chan); |
1198 | } |
1199 | |
1200 | BT_DBG("reqseq %d, final %d, poll %d, super %d" , control->reqseq, |
1201 | control->final, control->poll, control->super); |
1202 | |
1203 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1204 | control_field = __pack_extended_control(control); |
1205 | else |
1206 | control_field = __pack_enhanced_control(control); |
1207 | |
1208 | skb = l2cap_create_sframe_pdu(chan, control: control_field); |
1209 | if (!IS_ERR(ptr: skb)) |
1210 | l2cap_do_send(chan, skb); |
1211 | } |
1212 | |
1213 | static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll) |
1214 | { |
1215 | struct l2cap_ctrl control; |
1216 | |
1217 | BT_DBG("chan %p, poll %d" , chan, poll); |
1218 | |
1219 | memset(&control, 0, sizeof(control)); |
1220 | control.sframe = 1; |
1221 | control.poll = poll; |
1222 | |
1223 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
1224 | control.super = L2CAP_SUPER_RNR; |
1225 | else |
1226 | control.super = L2CAP_SUPER_RR; |
1227 | |
1228 | control.reqseq = chan->buffer_seq; |
1229 | l2cap_send_sframe(chan, control: &control); |
1230 | } |
1231 | |
1232 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
1233 | { |
1234 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
1235 | return true; |
1236 | |
1237 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1238 | } |
1239 | |
1240 | static bool __amp_capable(struct l2cap_chan *chan) |
1241 | { |
1242 | struct l2cap_conn *conn = chan->conn; |
1243 | struct hci_dev *hdev; |
1244 | bool amp_available = false; |
1245 | |
1246 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
1247 | return false; |
1248 | |
1249 | if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP)) |
1250 | return false; |
1251 | |
1252 | read_lock(&hci_dev_list_lock); |
1253 | list_for_each_entry(hdev, &hci_dev_list, list) { |
1254 | if (hdev->amp_type != AMP_TYPE_BREDR && |
1255 | test_bit(HCI_UP, &hdev->flags)) { |
1256 | amp_available = true; |
1257 | break; |
1258 | } |
1259 | } |
1260 | read_unlock(&hci_dev_list_lock); |
1261 | |
1262 | if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED) |
1263 | return amp_available; |
1264 | |
1265 | return false; |
1266 | } |
1267 | |
1268 | static bool l2cap_check_efs(struct l2cap_chan *chan) |
1269 | { |
1270 | /* Check EFS parameters */ |
1271 | return true; |
1272 | } |
1273 | |
1274 | void l2cap_send_conn_req(struct l2cap_chan *chan) |
1275 | { |
1276 | struct l2cap_conn *conn = chan->conn; |
1277 | struct l2cap_conn_req req; |
1278 | |
1279 | req.scid = cpu_to_le16(chan->scid); |
1280 | req.psm = chan->psm; |
1281 | |
1282 | chan->ident = l2cap_get_ident(conn); |
1283 | |
1284 | set_bit(nr: CONF_CONNECT_PEND, addr: &chan->conf_state); |
1285 | |
1286 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_CONN_REQ, len: sizeof(req), data: &req); |
1287 | } |
1288 | |
1289 | static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id) |
1290 | { |
1291 | struct l2cap_create_chan_req req; |
1292 | req.scid = cpu_to_le16(chan->scid); |
1293 | req.psm = chan->psm; |
1294 | req.amp_id = amp_id; |
1295 | |
1296 | chan->ident = l2cap_get_ident(conn: chan->conn); |
1297 | |
1298 | l2cap_send_cmd(conn: chan->conn, ident: chan->ident, L2CAP_CREATE_CHAN_REQ, |
1299 | len: sizeof(req), data: &req); |
1300 | } |
1301 | |
1302 | static void l2cap_move_setup(struct l2cap_chan *chan) |
1303 | { |
1304 | struct sk_buff *skb; |
1305 | |
1306 | BT_DBG("chan %p" , chan); |
1307 | |
1308 | if (chan->mode != L2CAP_MODE_ERTM) |
1309 | return; |
1310 | |
1311 | __clear_retrans_timer(chan); |
1312 | __clear_monitor_timer(chan); |
1313 | __clear_ack_timer(chan); |
1314 | |
1315 | chan->retry_count = 0; |
1316 | skb_queue_walk(&chan->tx_q, skb) { |
1317 | if (bt_cb(skb)->l2cap.retries) |
1318 | bt_cb(skb)->l2cap.retries = 1; |
1319 | else |
1320 | break; |
1321 | } |
1322 | |
1323 | chan->expected_tx_seq = chan->buffer_seq; |
1324 | |
1325 | clear_bit(nr: CONN_REJ_ACT, addr: &chan->conn_state); |
1326 | clear_bit(nr: CONN_SREJ_ACT, addr: &chan->conn_state); |
1327 | l2cap_seq_list_clear(seq_list: &chan->retrans_list); |
1328 | l2cap_seq_list_clear(seq_list: &chan->srej_list); |
1329 | skb_queue_purge(list: &chan->srej_q); |
1330 | |
1331 | chan->tx_state = L2CAP_TX_STATE_XMIT; |
1332 | chan->rx_state = L2CAP_RX_STATE_MOVE; |
1333 | |
1334 | set_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
1335 | } |
1336 | |
1337 | static void l2cap_move_done(struct l2cap_chan *chan) |
1338 | { |
1339 | u8 move_role = chan->move_role; |
1340 | BT_DBG("chan %p" , chan); |
1341 | |
1342 | chan->move_state = L2CAP_MOVE_STABLE; |
1343 | chan->move_role = L2CAP_MOVE_ROLE_NONE; |
1344 | |
1345 | if (chan->mode != L2CAP_MODE_ERTM) |
1346 | return; |
1347 | |
1348 | switch (move_role) { |
1349 | case L2CAP_MOVE_ROLE_INITIATOR: |
1350 | l2cap_tx(chan, NULL, NULL, event: L2CAP_EV_EXPLICIT_POLL); |
1351 | chan->rx_state = L2CAP_RX_STATE_WAIT_F; |
1352 | break; |
1353 | case L2CAP_MOVE_ROLE_RESPONDER: |
1354 | chan->rx_state = L2CAP_RX_STATE_WAIT_P; |
1355 | break; |
1356 | } |
1357 | } |
1358 | |
1359 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
1360 | { |
1361 | /* The channel may have already been flagged as connected in |
1362 | * case of receiving data before the L2CAP info req/rsp |
1363 | * procedure is complete. |
1364 | */ |
1365 | if (chan->state == BT_CONNECTED) |
1366 | return; |
1367 | |
1368 | /* This clears all conf flags, including CONF_NOT_COMPLETE */ |
1369 | chan->conf_state = 0; |
1370 | __clear_chan_timer(chan); |
1371 | |
1372 | switch (chan->mode) { |
1373 | case L2CAP_MODE_LE_FLOWCTL: |
1374 | case L2CAP_MODE_EXT_FLOWCTL: |
1375 | if (!chan->tx_credits) |
1376 | chan->ops->suspend(chan); |
1377 | break; |
1378 | } |
1379 | |
1380 | chan->state = BT_CONNECTED; |
1381 | |
1382 | chan->ops->ready(chan); |
1383 | } |
1384 | |
1385 | static void l2cap_le_connect(struct l2cap_chan *chan) |
1386 | { |
1387 | struct l2cap_conn *conn = chan->conn; |
1388 | struct l2cap_le_conn_req req; |
1389 | |
1390 | if (test_and_set_bit(nr: FLAG_LE_CONN_REQ_SENT, addr: &chan->flags)) |
1391 | return; |
1392 | |
1393 | if (!chan->imtu) |
1394 | chan->imtu = chan->conn->mtu; |
1395 | |
1396 | l2cap_le_flowctl_init(chan, tx_credits: 0); |
1397 | |
1398 | memset(&req, 0, sizeof(req)); |
1399 | req.psm = chan->psm; |
1400 | req.scid = cpu_to_le16(chan->scid); |
1401 | req.mtu = cpu_to_le16(chan->imtu); |
1402 | req.mps = cpu_to_le16(chan->mps); |
1403 | req.credits = cpu_to_le16(chan->rx_credits); |
1404 | |
1405 | chan->ident = l2cap_get_ident(conn); |
1406 | |
1407 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_LE_CONN_REQ, |
1408 | len: sizeof(req), data: &req); |
1409 | } |
1410 | |
1411 | struct l2cap_ecred_conn_data { |
1412 | struct { |
1413 | struct l2cap_ecred_conn_req req; |
1414 | __le16 scid[5]; |
1415 | } __packed pdu; |
1416 | struct l2cap_chan *chan; |
1417 | struct pid *pid; |
1418 | int count; |
1419 | }; |
1420 | |
1421 | static void l2cap_ecred_defer_connect(struct l2cap_chan *chan, void *data) |
1422 | { |
1423 | struct l2cap_ecred_conn_data *conn = data; |
1424 | struct pid *pid; |
1425 | |
1426 | if (chan == conn->chan) |
1427 | return; |
1428 | |
1429 | if (!test_and_clear_bit(nr: FLAG_DEFER_SETUP, addr: &chan->flags)) |
1430 | return; |
1431 | |
1432 | pid = chan->ops->get_peer_pid(chan); |
1433 | |
1434 | /* Only add deferred channels with the same PID/PSM */ |
1435 | if (conn->pid != pid || chan->psm != conn->chan->psm || chan->ident || |
1436 | chan->mode != L2CAP_MODE_EXT_FLOWCTL || chan->state != BT_CONNECT) |
1437 | return; |
1438 | |
1439 | if (test_and_set_bit(nr: FLAG_ECRED_CONN_REQ_SENT, addr: &chan->flags)) |
1440 | return; |
1441 | |
1442 | l2cap_ecred_init(chan, tx_credits: 0); |
1443 | |
1444 | /* Set the same ident so we can match on the rsp */ |
1445 | chan->ident = conn->chan->ident; |
1446 | |
1447 | /* Include all channels deferred */ |
1448 | conn->pdu.scid[conn->count] = cpu_to_le16(chan->scid); |
1449 | |
1450 | conn->count++; |
1451 | } |
1452 | |
1453 | static void l2cap_ecred_connect(struct l2cap_chan *chan) |
1454 | { |
1455 | struct l2cap_conn *conn = chan->conn; |
1456 | struct l2cap_ecred_conn_data data; |
1457 | |
1458 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) |
1459 | return; |
1460 | |
1461 | if (test_and_set_bit(nr: FLAG_ECRED_CONN_REQ_SENT, addr: &chan->flags)) |
1462 | return; |
1463 | |
1464 | l2cap_ecred_init(chan, tx_credits: 0); |
1465 | |
1466 | memset(&data, 0, sizeof(data)); |
1467 | data.pdu.req.psm = chan->psm; |
1468 | data.pdu.req.mtu = cpu_to_le16(chan->imtu); |
1469 | data.pdu.req.mps = cpu_to_le16(chan->mps); |
1470 | data.pdu.req.credits = cpu_to_le16(chan->rx_credits); |
1471 | data.pdu.scid[0] = cpu_to_le16(chan->scid); |
1472 | |
1473 | chan->ident = l2cap_get_ident(conn); |
1474 | |
1475 | data.count = 1; |
1476 | data.chan = chan; |
1477 | data.pid = chan->ops->get_peer_pid(chan); |
1478 | |
1479 | __l2cap_chan_list(conn, func: l2cap_ecred_defer_connect, data: &data); |
1480 | |
1481 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_ECRED_CONN_REQ, |
1482 | len: sizeof(data.pdu.req) + data.count * sizeof(__le16), |
1483 | data: &data.pdu); |
1484 | } |
1485 | |
1486 | static void l2cap_le_start(struct l2cap_chan *chan) |
1487 | { |
1488 | struct l2cap_conn *conn = chan->conn; |
1489 | |
1490 | if (!smp_conn_security(hcon: conn->hcon, sec_level: chan->sec_level)) |
1491 | return; |
1492 | |
1493 | if (!chan->psm) { |
1494 | l2cap_chan_ready(chan); |
1495 | return; |
1496 | } |
1497 | |
1498 | if (chan->state == BT_CONNECT) { |
1499 | if (chan->mode == L2CAP_MODE_EXT_FLOWCTL) |
1500 | l2cap_ecred_connect(chan); |
1501 | else |
1502 | l2cap_le_connect(chan); |
1503 | } |
1504 | } |
1505 | |
1506 | static void l2cap_start_connection(struct l2cap_chan *chan) |
1507 | { |
1508 | if (__amp_capable(chan)) { |
1509 | BT_DBG("chan %p AMP capable: discover AMPs" , chan); |
1510 | a2mp_discover_amp(chan); |
1511 | } else if (chan->conn->hcon->type == LE_LINK) { |
1512 | l2cap_le_start(chan); |
1513 | } else { |
1514 | l2cap_send_conn_req(chan); |
1515 | } |
1516 | } |
1517 | |
1518 | static void l2cap_request_info(struct l2cap_conn *conn) |
1519 | { |
1520 | struct l2cap_info_req req; |
1521 | |
1522 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
1523 | return; |
1524 | |
1525 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
1526 | |
1527 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; |
1528 | conn->info_ident = l2cap_get_ident(conn); |
1529 | |
1530 | schedule_delayed_work(dwork: &conn->info_timer, L2CAP_INFO_TIMEOUT); |
1531 | |
1532 | l2cap_send_cmd(conn, ident: conn->info_ident, L2CAP_INFO_REQ, |
1533 | len: sizeof(req), data: &req); |
1534 | } |
1535 | |
1536 | static bool l2cap_check_enc_key_size(struct hci_conn *hcon) |
1537 | { |
1538 | /* The minimum encryption key size needs to be enforced by the |
1539 | * host stack before establishing any L2CAP connections. The |
1540 | * specification in theory allows a minimum of 1, but to align |
1541 | * BR/EDR and LE transports, a minimum of 7 is chosen. |
1542 | * |
1543 | * This check might also be called for unencrypted connections |
1544 | * that have no key size requirements. Ensure that the link is |
1545 | * actually encrypted before enforcing a key size. |
1546 | */ |
1547 | int min_key_size = hcon->hdev->min_enc_key_size; |
1548 | |
1549 | /* On FIPS security level, key size must be 16 bytes */ |
1550 | if (hcon->sec_level == BT_SECURITY_FIPS) |
1551 | min_key_size = 16; |
1552 | |
1553 | return (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags) || |
1554 | hcon->enc_key_size >= min_key_size); |
1555 | } |
1556 | |
1557 | static void l2cap_do_start(struct l2cap_chan *chan) |
1558 | { |
1559 | struct l2cap_conn *conn = chan->conn; |
1560 | |
1561 | if (conn->hcon->type == LE_LINK) { |
1562 | l2cap_le_start(chan); |
1563 | return; |
1564 | } |
1565 | |
1566 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) { |
1567 | l2cap_request_info(conn); |
1568 | return; |
1569 | } |
1570 | |
1571 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
1572 | return; |
1573 | |
1574 | if (!l2cap_chan_check_security(chan, initiator: true) || |
1575 | !__l2cap_no_conn_pending(chan)) |
1576 | return; |
1577 | |
1578 | if (l2cap_check_enc_key_size(hcon: conn->hcon)) |
1579 | l2cap_start_connection(chan); |
1580 | else |
1581 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
1582 | } |
1583 | |
1584 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
1585 | { |
1586 | u32 local_feat_mask = l2cap_feat_mask; |
1587 | if (!disable_ertm) |
1588 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
1589 | |
1590 | switch (mode) { |
1591 | case L2CAP_MODE_ERTM: |
1592 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; |
1593 | case L2CAP_MODE_STREAMING: |
1594 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; |
1595 | default: |
1596 | return 0x00; |
1597 | } |
1598 | } |
1599 | |
1600 | static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err) |
1601 | { |
1602 | struct l2cap_conn *conn = chan->conn; |
1603 | struct l2cap_disconn_req req; |
1604 | |
1605 | if (!conn) |
1606 | return; |
1607 | |
1608 | if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) { |
1609 | __clear_retrans_timer(chan); |
1610 | __clear_monitor_timer(chan); |
1611 | __clear_ack_timer(chan); |
1612 | } |
1613 | |
1614 | if (chan->scid == L2CAP_CID_A2MP) { |
1615 | l2cap_state_change(chan, state: BT_DISCONN); |
1616 | return; |
1617 | } |
1618 | |
1619 | req.dcid = cpu_to_le16(chan->dcid); |
1620 | req.scid = cpu_to_le16(chan->scid); |
1621 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), L2CAP_DISCONN_REQ, |
1622 | len: sizeof(req), data: &req); |
1623 | |
1624 | l2cap_state_change_and_error(chan, state: BT_DISCONN, err); |
1625 | } |
1626 | |
1627 | /* ---- L2CAP connections ---- */ |
1628 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1629 | { |
1630 | struct l2cap_chan *chan, *tmp; |
1631 | |
1632 | BT_DBG("conn %p" , conn); |
1633 | |
1634 | mutex_lock(&conn->chan_lock); |
1635 | |
1636 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
1637 | l2cap_chan_lock(chan); |
1638 | |
1639 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
1640 | l2cap_chan_ready(chan); |
1641 | l2cap_chan_unlock(chan); |
1642 | continue; |
1643 | } |
1644 | |
1645 | if (chan->state == BT_CONNECT) { |
1646 | if (!l2cap_chan_check_security(chan, initiator: true) || |
1647 | !__l2cap_no_conn_pending(chan)) { |
1648 | l2cap_chan_unlock(chan); |
1649 | continue; |
1650 | } |
1651 | |
1652 | if (!l2cap_mode_supported(mode: chan->mode, feat_mask: conn->feat_mask) |
1653 | && test_bit(CONF_STATE2_DEVICE, |
1654 | &chan->conf_state)) { |
1655 | l2cap_chan_close(chan, ECONNRESET); |
1656 | l2cap_chan_unlock(chan); |
1657 | continue; |
1658 | } |
1659 | |
1660 | if (l2cap_check_enc_key_size(hcon: conn->hcon)) |
1661 | l2cap_start_connection(chan); |
1662 | else |
1663 | l2cap_chan_close(chan, ECONNREFUSED); |
1664 | |
1665 | } else if (chan->state == BT_CONNECT2) { |
1666 | struct l2cap_conn_rsp rsp; |
1667 | char buf[128]; |
1668 | rsp.scid = cpu_to_le16(chan->dcid); |
1669 | rsp.dcid = cpu_to_le16(chan->scid); |
1670 | |
1671 | if (l2cap_chan_check_security(chan, initiator: false)) { |
1672 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
1673 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1674 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); |
1675 | chan->ops->defer(chan); |
1676 | |
1677 | } else { |
1678 | l2cap_state_change(chan, state: BT_CONFIG); |
1679 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1680 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
1681 | } |
1682 | } else { |
1683 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
1684 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); |
1685 | } |
1686 | |
1687 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_CONN_RSP, |
1688 | len: sizeof(rsp), data: &rsp); |
1689 | |
1690 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
1691 | rsp.result != L2CAP_CR_SUCCESS) { |
1692 | l2cap_chan_unlock(chan); |
1693 | continue; |
1694 | } |
1695 | |
1696 | set_bit(nr: CONF_REQ_SENT, addr: &chan->conf_state); |
1697 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), L2CAP_CONF_REQ, |
1698 | len: l2cap_build_conf_req(chan, data: buf, data_size: sizeof(buf)), data: buf); |
1699 | chan->num_conf_req++; |
1700 | } |
1701 | |
1702 | l2cap_chan_unlock(chan); |
1703 | } |
1704 | |
1705 | mutex_unlock(lock: &conn->chan_lock); |
1706 | } |
1707 | |
1708 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) |
1709 | { |
1710 | struct hci_conn *hcon = conn->hcon; |
1711 | struct hci_dev *hdev = hcon->hdev; |
1712 | |
1713 | BT_DBG("%s conn %p" , hdev->name, conn); |
1714 | |
1715 | /* For outgoing pairing which doesn't necessarily have an |
1716 | * associated socket (e.g. mgmt_pair_device). |
1717 | */ |
1718 | if (hcon->out) |
1719 | smp_conn_security(hcon, sec_level: hcon->pending_sec_level); |
1720 | |
1721 | /* For LE peripheral connections, make sure the connection interval |
1722 | * is in the range of the minimum and maximum interval that has |
1723 | * been configured for this connection. If not, then trigger |
1724 | * the connection update procedure. |
1725 | */ |
1726 | if (hcon->role == HCI_ROLE_SLAVE && |
1727 | (hcon->le_conn_interval < hcon->le_conn_min_interval || |
1728 | hcon->le_conn_interval > hcon->le_conn_max_interval)) { |
1729 | struct l2cap_conn_param_update_req req; |
1730 | |
1731 | req.min = cpu_to_le16(hcon->le_conn_min_interval); |
1732 | req.max = cpu_to_le16(hcon->le_conn_max_interval); |
1733 | req.latency = cpu_to_le16(hcon->le_conn_latency); |
1734 | req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout); |
1735 | |
1736 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), |
1737 | L2CAP_CONN_PARAM_UPDATE_REQ, len: sizeof(req), data: &req); |
1738 | } |
1739 | } |
1740 | |
1741 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1742 | { |
1743 | struct l2cap_chan *chan; |
1744 | struct hci_conn *hcon = conn->hcon; |
1745 | |
1746 | BT_DBG("conn %p" , conn); |
1747 | |
1748 | if (hcon->type == ACL_LINK) |
1749 | l2cap_request_info(conn); |
1750 | |
1751 | mutex_lock(&conn->chan_lock); |
1752 | |
1753 | list_for_each_entry(chan, &conn->chan_l, list) { |
1754 | |
1755 | l2cap_chan_lock(chan); |
1756 | |
1757 | if (chan->scid == L2CAP_CID_A2MP) { |
1758 | l2cap_chan_unlock(chan); |
1759 | continue; |
1760 | } |
1761 | |
1762 | if (hcon->type == LE_LINK) { |
1763 | l2cap_le_start(chan); |
1764 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
1765 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
1766 | l2cap_chan_ready(chan); |
1767 | } else if (chan->state == BT_CONNECT) { |
1768 | l2cap_do_start(chan); |
1769 | } |
1770 | |
1771 | l2cap_chan_unlock(chan); |
1772 | } |
1773 | |
1774 | mutex_unlock(lock: &conn->chan_lock); |
1775 | |
1776 | if (hcon->type == LE_LINK) |
1777 | l2cap_le_conn_ready(conn); |
1778 | |
1779 | queue_work(wq: hcon->hdev->workqueue, work: &conn->pending_rx_work); |
1780 | } |
1781 | |
1782 | /* Notify sockets that we cannot guaranty reliability anymore */ |
1783 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) |
1784 | { |
1785 | struct l2cap_chan *chan; |
1786 | |
1787 | BT_DBG("conn %p" , conn); |
1788 | |
1789 | mutex_lock(&conn->chan_lock); |
1790 | |
1791 | list_for_each_entry(chan, &conn->chan_l, list) { |
1792 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
1793 | l2cap_chan_set_err(chan, err); |
1794 | } |
1795 | |
1796 | mutex_unlock(lock: &conn->chan_lock); |
1797 | } |
1798 | |
1799 | static void l2cap_info_timeout(struct work_struct *work) |
1800 | { |
1801 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1802 | info_timer.work); |
1803 | |
1804 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
1805 | conn->info_ident = 0; |
1806 | |
1807 | l2cap_conn_start(conn); |
1808 | } |
1809 | |
1810 | /* |
1811 | * l2cap_user |
1812 | * External modules can register l2cap_user objects on l2cap_conn. The ->probe |
1813 | * callback is called during registration. The ->remove callback is called |
1814 | * during unregistration. |
1815 | * An l2cap_user object can either be explicitly unregistered or when the |
1816 | * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon, |
1817 | * l2cap->hchan, .. are valid as long as the remove callback hasn't been called. |
1818 | * External modules must own a reference to the l2cap_conn object if they intend |
1819 | * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at |
1820 | * any time if they don't. |
1821 | */ |
1822 | |
1823 | int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user) |
1824 | { |
1825 | struct hci_dev *hdev = conn->hcon->hdev; |
1826 | int ret; |
1827 | |
1828 | /* We need to check whether l2cap_conn is registered. If it is not, we |
1829 | * must not register the l2cap_user. l2cap_conn_del() is unregisters |
1830 | * l2cap_conn objects, but doesn't provide its own locking. Instead, it |
1831 | * relies on the parent hci_conn object to be locked. This itself relies |
1832 | * on the hci_dev object to be locked. So we must lock the hci device |
1833 | * here, too. */ |
1834 | |
1835 | hci_dev_lock(hdev); |
1836 | |
1837 | if (!list_empty(head: &user->list)) { |
1838 | ret = -EINVAL; |
1839 | goto out_unlock; |
1840 | } |
1841 | |
1842 | /* conn->hchan is NULL after l2cap_conn_del() was called */ |
1843 | if (!conn->hchan) { |
1844 | ret = -ENODEV; |
1845 | goto out_unlock; |
1846 | } |
1847 | |
1848 | ret = user->probe(conn, user); |
1849 | if (ret) |
1850 | goto out_unlock; |
1851 | |
1852 | list_add(new: &user->list, head: &conn->users); |
1853 | ret = 0; |
1854 | |
1855 | out_unlock: |
1856 | hci_dev_unlock(hdev); |
1857 | return ret; |
1858 | } |
1859 | EXPORT_SYMBOL(l2cap_register_user); |
1860 | |
1861 | void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user) |
1862 | { |
1863 | struct hci_dev *hdev = conn->hcon->hdev; |
1864 | |
1865 | hci_dev_lock(hdev); |
1866 | |
1867 | if (list_empty(head: &user->list)) |
1868 | goto out_unlock; |
1869 | |
1870 | list_del_init(entry: &user->list); |
1871 | user->remove(conn, user); |
1872 | |
1873 | out_unlock: |
1874 | hci_dev_unlock(hdev); |
1875 | } |
1876 | EXPORT_SYMBOL(l2cap_unregister_user); |
1877 | |
1878 | static void l2cap_unregister_all_users(struct l2cap_conn *conn) |
1879 | { |
1880 | struct l2cap_user *user; |
1881 | |
1882 | while (!list_empty(head: &conn->users)) { |
1883 | user = list_first_entry(&conn->users, struct l2cap_user, list); |
1884 | list_del_init(entry: &user->list); |
1885 | user->remove(conn, user); |
1886 | } |
1887 | } |
1888 | |
1889 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1890 | { |
1891 | struct l2cap_conn *conn = hcon->l2cap_data; |
1892 | struct l2cap_chan *chan, *l; |
1893 | |
1894 | if (!conn) |
1895 | return; |
1896 | |
1897 | BT_DBG("hcon %p conn %p, err %d" , hcon, conn, err); |
1898 | |
1899 | kfree_skb(skb: conn->rx_skb); |
1900 | |
1901 | skb_queue_purge(list: &conn->pending_rx); |
1902 | |
1903 | /* We can not call flush_work(&conn->pending_rx_work) here since we |
1904 | * might block if we are running on a worker from the same workqueue |
1905 | * pending_rx_work is waiting on. |
1906 | */ |
1907 | if (work_pending(&conn->pending_rx_work)) |
1908 | cancel_work_sync(work: &conn->pending_rx_work); |
1909 | |
1910 | cancel_delayed_work_sync(dwork: &conn->id_addr_timer); |
1911 | |
1912 | l2cap_unregister_all_users(conn); |
1913 | |
1914 | /* Force the connection to be immediately dropped */ |
1915 | hcon->disc_timeout = 0; |
1916 | |
1917 | mutex_lock(&conn->chan_lock); |
1918 | |
1919 | /* Kill channels */ |
1920 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
1921 | l2cap_chan_hold(c: chan); |
1922 | l2cap_chan_lock(chan); |
1923 | |
1924 | l2cap_chan_del(chan, err); |
1925 | |
1926 | chan->ops->close(chan); |
1927 | |
1928 | l2cap_chan_unlock(chan); |
1929 | l2cap_chan_put(chan); |
1930 | } |
1931 | |
1932 | mutex_unlock(lock: &conn->chan_lock); |
1933 | |
1934 | hci_chan_del(chan: conn->hchan); |
1935 | |
1936 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
1937 | cancel_delayed_work_sync(dwork: &conn->info_timer); |
1938 | |
1939 | hcon->l2cap_data = NULL; |
1940 | conn->hchan = NULL; |
1941 | l2cap_conn_put(conn); |
1942 | } |
1943 | |
1944 | static void l2cap_conn_free(struct kref *ref) |
1945 | { |
1946 | struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref); |
1947 | |
1948 | hci_conn_put(conn: conn->hcon); |
1949 | kfree(objp: conn); |
1950 | } |
1951 | |
1952 | struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn) |
1953 | { |
1954 | kref_get(kref: &conn->ref); |
1955 | return conn; |
1956 | } |
1957 | EXPORT_SYMBOL(l2cap_conn_get); |
1958 | |
1959 | void l2cap_conn_put(struct l2cap_conn *conn) |
1960 | { |
1961 | kref_put(kref: &conn->ref, release: l2cap_conn_free); |
1962 | } |
1963 | EXPORT_SYMBOL(l2cap_conn_put); |
1964 | |
1965 | /* ---- Socket interface ---- */ |
1966 | |
1967 | /* Find socket with psm and source / destination bdaddr. |
1968 | * Returns closest match. |
1969 | */ |
1970 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1971 | bdaddr_t *src, |
1972 | bdaddr_t *dst, |
1973 | u8 link_type) |
1974 | { |
1975 | struct l2cap_chan *c, *tmp, *c1 = NULL; |
1976 | |
1977 | read_lock(&chan_list_lock); |
1978 | |
1979 | list_for_each_entry_safe(c, tmp, &chan_list, global_l) { |
1980 | if (state && c->state != state) |
1981 | continue; |
1982 | |
1983 | if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR) |
1984 | continue; |
1985 | |
1986 | if (link_type == LE_LINK && c->src_type == BDADDR_BREDR) |
1987 | continue; |
1988 | |
1989 | if (c->chan_type != L2CAP_CHAN_FIXED && c->psm == psm) { |
1990 | int src_match, dst_match; |
1991 | int src_any, dst_any; |
1992 | |
1993 | /* Exact match. */ |
1994 | src_match = !bacmp(ba1: &c->src, ba2: src); |
1995 | dst_match = !bacmp(ba1: &c->dst, ba2: dst); |
1996 | if (src_match && dst_match) { |
1997 | if (!l2cap_chan_hold_unless_zero(c)) |
1998 | continue; |
1999 | |
2000 | read_unlock(&chan_list_lock); |
2001 | return c; |
2002 | } |
2003 | |
2004 | /* Closest match */ |
2005 | src_any = !bacmp(ba1: &c->src, BDADDR_ANY); |
2006 | dst_any = !bacmp(ba1: &c->dst, BDADDR_ANY); |
2007 | if ((src_match && dst_any) || (src_any && dst_match) || |
2008 | (src_any && dst_any)) |
2009 | c1 = c; |
2010 | } |
2011 | } |
2012 | |
2013 | if (c1) |
2014 | c1 = l2cap_chan_hold_unless_zero(c: c1); |
2015 | |
2016 | read_unlock(&chan_list_lock); |
2017 | |
2018 | return c1; |
2019 | } |
2020 | |
2021 | static void l2cap_monitor_timeout(struct work_struct *work) |
2022 | { |
2023 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2024 | monitor_timer.work); |
2025 | |
2026 | BT_DBG("chan %p" , chan); |
2027 | |
2028 | l2cap_chan_lock(chan); |
2029 | |
2030 | if (!chan->conn) { |
2031 | l2cap_chan_unlock(chan); |
2032 | l2cap_chan_put(chan); |
2033 | return; |
2034 | } |
2035 | |
2036 | l2cap_tx(chan, NULL, NULL, event: L2CAP_EV_MONITOR_TO); |
2037 | |
2038 | l2cap_chan_unlock(chan); |
2039 | l2cap_chan_put(chan); |
2040 | } |
2041 | |
2042 | static void l2cap_retrans_timeout(struct work_struct *work) |
2043 | { |
2044 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2045 | retrans_timer.work); |
2046 | |
2047 | BT_DBG("chan %p" , chan); |
2048 | |
2049 | l2cap_chan_lock(chan); |
2050 | |
2051 | if (!chan->conn) { |
2052 | l2cap_chan_unlock(chan); |
2053 | l2cap_chan_put(chan); |
2054 | return; |
2055 | } |
2056 | |
2057 | l2cap_tx(chan, NULL, NULL, event: L2CAP_EV_RETRANS_TO); |
2058 | l2cap_chan_unlock(chan); |
2059 | l2cap_chan_put(chan); |
2060 | } |
2061 | |
2062 | static void l2cap_streaming_send(struct l2cap_chan *chan, |
2063 | struct sk_buff_head *skbs) |
2064 | { |
2065 | struct sk_buff *skb; |
2066 | struct l2cap_ctrl *control; |
2067 | |
2068 | BT_DBG("chan %p, skbs %p" , chan, skbs); |
2069 | |
2070 | if (__chan_is_moving(chan)) |
2071 | return; |
2072 | |
2073 | skb_queue_splice_tail_init(list: skbs, head: &chan->tx_q); |
2074 | |
2075 | while (!skb_queue_empty(list: &chan->tx_q)) { |
2076 | |
2077 | skb = skb_dequeue(list: &chan->tx_q); |
2078 | |
2079 | bt_cb(skb)->l2cap.retries = 1; |
2080 | control = &bt_cb(skb)->l2cap; |
2081 | |
2082 | control->reqseq = 0; |
2083 | control->txseq = chan->next_tx_seq; |
2084 | |
2085 | __pack_control(chan, control, skb); |
2086 | |
2087 | if (chan->fcs == L2CAP_FCS_CRC16) { |
2088 | u16 fcs = crc16(crc: 0, buffer: (u8 *) skb->data, len: skb->len); |
2089 | put_unaligned_le16(val: fcs, p: skb_put(skb, L2CAP_FCS_SIZE)); |
2090 | } |
2091 | |
2092 | l2cap_do_send(chan, skb); |
2093 | |
2094 | BT_DBG("Sent txseq %u" , control->txseq); |
2095 | |
2096 | chan->next_tx_seq = __next_seq(chan, seq: chan->next_tx_seq); |
2097 | chan->frames_sent++; |
2098 | } |
2099 | } |
2100 | |
2101 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
2102 | { |
2103 | struct sk_buff *skb, *tx_skb; |
2104 | struct l2cap_ctrl *control; |
2105 | int sent = 0; |
2106 | |
2107 | BT_DBG("chan %p" , chan); |
2108 | |
2109 | if (chan->state != BT_CONNECTED) |
2110 | return -ENOTCONN; |
2111 | |
2112 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
2113 | return 0; |
2114 | |
2115 | if (__chan_is_moving(chan)) |
2116 | return 0; |
2117 | |
2118 | while (chan->tx_send_head && |
2119 | chan->unacked_frames < chan->remote_tx_win && |
2120 | chan->tx_state == L2CAP_TX_STATE_XMIT) { |
2121 | |
2122 | skb = chan->tx_send_head; |
2123 | |
2124 | bt_cb(skb)->l2cap.retries = 1; |
2125 | control = &bt_cb(skb)->l2cap; |
2126 | |
2127 | if (test_and_clear_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state)) |
2128 | control->final = 1; |
2129 | |
2130 | control->reqseq = chan->buffer_seq; |
2131 | chan->last_acked_seq = chan->buffer_seq; |
2132 | control->txseq = chan->next_tx_seq; |
2133 | |
2134 | __pack_control(chan, control, skb); |
2135 | |
2136 | if (chan->fcs == L2CAP_FCS_CRC16) { |
2137 | u16 fcs = crc16(crc: 0, buffer: (u8 *) skb->data, len: skb->len); |
2138 | put_unaligned_le16(val: fcs, p: skb_put(skb, L2CAP_FCS_SIZE)); |
2139 | } |
2140 | |
2141 | /* Clone after data has been modified. Data is assumed to be |
2142 | read-only (for locking purposes) on cloned sk_buffs. |
2143 | */ |
2144 | tx_skb = skb_clone(skb, GFP_KERNEL); |
2145 | |
2146 | if (!tx_skb) |
2147 | break; |
2148 | |
2149 | __set_retrans_timer(chan); |
2150 | |
2151 | chan->next_tx_seq = __next_seq(chan, seq: chan->next_tx_seq); |
2152 | chan->unacked_frames++; |
2153 | chan->frames_sent++; |
2154 | sent++; |
2155 | |
2156 | if (skb_queue_is_last(list: &chan->tx_q, skb)) |
2157 | chan->tx_send_head = NULL; |
2158 | else |
2159 | chan->tx_send_head = skb_queue_next(list: &chan->tx_q, skb); |
2160 | |
2161 | l2cap_do_send(chan, skb: tx_skb); |
2162 | BT_DBG("Sent txseq %u" , control->txseq); |
2163 | } |
2164 | |
2165 | BT_DBG("Sent %d, %u unacked, %u in ERTM queue" , sent, |
2166 | chan->unacked_frames, skb_queue_len(&chan->tx_q)); |
2167 | |
2168 | return sent; |
2169 | } |
2170 | |
2171 | static void l2cap_ertm_resend(struct l2cap_chan *chan) |
2172 | { |
2173 | struct l2cap_ctrl control; |
2174 | struct sk_buff *skb; |
2175 | struct sk_buff *tx_skb; |
2176 | u16 seq; |
2177 | |
2178 | BT_DBG("chan %p" , chan); |
2179 | |
2180 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
2181 | return; |
2182 | |
2183 | if (__chan_is_moving(chan)) |
2184 | return; |
2185 | |
2186 | while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) { |
2187 | seq = l2cap_seq_list_pop(seq_list: &chan->retrans_list); |
2188 | |
2189 | skb = l2cap_ertm_seq_in_queue(head: &chan->tx_q, seq); |
2190 | if (!skb) { |
2191 | BT_DBG("Error: Can't retransmit seq %d, frame missing" , |
2192 | seq); |
2193 | continue; |
2194 | } |
2195 | |
2196 | bt_cb(skb)->l2cap.retries++; |
2197 | control = bt_cb(skb)->l2cap; |
2198 | |
2199 | if (chan->max_tx != 0 && |
2200 | bt_cb(skb)->l2cap.retries > chan->max_tx) { |
2201 | BT_DBG("Retry limit exceeded (%d)" , chan->max_tx); |
2202 | l2cap_send_disconn_req(chan, ECONNRESET); |
2203 | l2cap_seq_list_clear(seq_list: &chan->retrans_list); |
2204 | break; |
2205 | } |
2206 | |
2207 | control.reqseq = chan->buffer_seq; |
2208 | if (test_and_clear_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state)) |
2209 | control.final = 1; |
2210 | else |
2211 | control.final = 0; |
2212 | |
2213 | if (skb_cloned(skb)) { |
2214 | /* Cloned sk_buffs are read-only, so we need a |
2215 | * writeable copy |
2216 | */ |
2217 | tx_skb = skb_copy(skb, GFP_KERNEL); |
2218 | } else { |
2219 | tx_skb = skb_clone(skb, GFP_KERNEL); |
2220 | } |
2221 | |
2222 | if (!tx_skb) { |
2223 | l2cap_seq_list_clear(seq_list: &chan->retrans_list); |
2224 | break; |
2225 | } |
2226 | |
2227 | /* Update skb contents */ |
2228 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { |
2229 | put_unaligned_le32(val: __pack_extended_control(control: &control), |
2230 | p: tx_skb->data + L2CAP_HDR_SIZE); |
2231 | } else { |
2232 | put_unaligned_le16(val: __pack_enhanced_control(control: &control), |
2233 | p: tx_skb->data + L2CAP_HDR_SIZE); |
2234 | } |
2235 | |
2236 | /* Update FCS */ |
2237 | if (chan->fcs == L2CAP_FCS_CRC16) { |
2238 | u16 fcs = crc16(crc: 0, buffer: (u8 *) tx_skb->data, |
2239 | len: tx_skb->len - L2CAP_FCS_SIZE); |
2240 | put_unaligned_le16(val: fcs, p: skb_tail_pointer(skb: tx_skb) - |
2241 | L2CAP_FCS_SIZE); |
2242 | } |
2243 | |
2244 | l2cap_do_send(chan, skb: tx_skb); |
2245 | |
2246 | BT_DBG("Resent txseq %d" , control.txseq); |
2247 | |
2248 | chan->last_acked_seq = chan->buffer_seq; |
2249 | } |
2250 | } |
2251 | |
2252 | static void l2cap_retransmit(struct l2cap_chan *chan, |
2253 | struct l2cap_ctrl *control) |
2254 | { |
2255 | BT_DBG("chan %p, control %p" , chan, control); |
2256 | |
2257 | l2cap_seq_list_append(seq_list: &chan->retrans_list, seq: control->reqseq); |
2258 | l2cap_ertm_resend(chan); |
2259 | } |
2260 | |
2261 | static void l2cap_retransmit_all(struct l2cap_chan *chan, |
2262 | struct l2cap_ctrl *control) |
2263 | { |
2264 | struct sk_buff *skb; |
2265 | |
2266 | BT_DBG("chan %p, control %p" , chan, control); |
2267 | |
2268 | if (control->poll) |
2269 | set_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state); |
2270 | |
2271 | l2cap_seq_list_clear(seq_list: &chan->retrans_list); |
2272 | |
2273 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
2274 | return; |
2275 | |
2276 | if (chan->unacked_frames) { |
2277 | skb_queue_walk(&chan->tx_q, skb) { |
2278 | if (bt_cb(skb)->l2cap.txseq == control->reqseq || |
2279 | skb == chan->tx_send_head) |
2280 | break; |
2281 | } |
2282 | |
2283 | skb_queue_walk_from(&chan->tx_q, skb) { |
2284 | if (skb == chan->tx_send_head) |
2285 | break; |
2286 | |
2287 | l2cap_seq_list_append(seq_list: &chan->retrans_list, |
2288 | bt_cb(skb)->l2cap.txseq); |
2289 | } |
2290 | |
2291 | l2cap_ertm_resend(chan); |
2292 | } |
2293 | } |
2294 | |
2295 | static void l2cap_send_ack(struct l2cap_chan *chan) |
2296 | { |
2297 | struct l2cap_ctrl control; |
2298 | u16 frames_to_ack = __seq_offset(chan, seq1: chan->buffer_seq, |
2299 | seq2: chan->last_acked_seq); |
2300 | int threshold; |
2301 | |
2302 | BT_DBG("chan %p last_acked_seq %d buffer_seq %d" , |
2303 | chan, chan->last_acked_seq, chan->buffer_seq); |
2304 | |
2305 | memset(&control, 0, sizeof(control)); |
2306 | control.sframe = 1; |
2307 | |
2308 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
2309 | chan->rx_state == L2CAP_RX_STATE_RECV) { |
2310 | __clear_ack_timer(chan); |
2311 | control.super = L2CAP_SUPER_RNR; |
2312 | control.reqseq = chan->buffer_seq; |
2313 | l2cap_send_sframe(chan, control: &control); |
2314 | } else { |
2315 | if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) { |
2316 | l2cap_ertm_send(chan); |
2317 | /* If any i-frames were sent, they included an ack */ |
2318 | if (chan->buffer_seq == chan->last_acked_seq) |
2319 | frames_to_ack = 0; |
2320 | } |
2321 | |
2322 | /* Ack now if the window is 3/4ths full. |
2323 | * Calculate without mul or div |
2324 | */ |
2325 | threshold = chan->ack_win; |
2326 | threshold += threshold << 1; |
2327 | threshold >>= 2; |
2328 | |
2329 | BT_DBG("frames_to_ack %u, threshold %d" , frames_to_ack, |
2330 | threshold); |
2331 | |
2332 | if (frames_to_ack >= threshold) { |
2333 | __clear_ack_timer(chan); |
2334 | control.super = L2CAP_SUPER_RR; |
2335 | control.reqseq = chan->buffer_seq; |
2336 | l2cap_send_sframe(chan, control: &control); |
2337 | frames_to_ack = 0; |
2338 | } |
2339 | |
2340 | if (frames_to_ack) |
2341 | __set_ack_timer(chan); |
2342 | } |
2343 | } |
2344 | |
2345 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
2346 | struct msghdr *msg, int len, |
2347 | int count, struct sk_buff *skb) |
2348 | { |
2349 | struct l2cap_conn *conn = chan->conn; |
2350 | struct sk_buff **frag; |
2351 | int sent = 0; |
2352 | |
2353 | if (!copy_from_iter_full(addr: skb_put(skb, len: count), bytes: count, i: &msg->msg_iter)) |
2354 | return -EFAULT; |
2355 | |
2356 | sent += count; |
2357 | len -= count; |
2358 | |
2359 | /* Continuation fragments (no L2CAP header) */ |
2360 | frag = &skb_shinfo(skb)->frag_list; |
2361 | while (len) { |
2362 | struct sk_buff *tmp; |
2363 | |
2364 | count = min_t(unsigned int, conn->mtu, len); |
2365 | |
2366 | tmp = chan->ops->alloc_skb(chan, 0, count, |
2367 | msg->msg_flags & MSG_DONTWAIT); |
2368 | if (IS_ERR(ptr: tmp)) |
2369 | return PTR_ERR(ptr: tmp); |
2370 | |
2371 | *frag = tmp; |
2372 | |
2373 | if (!copy_from_iter_full(addr: skb_put(skb: *frag, len: count), bytes: count, |
2374 | i: &msg->msg_iter)) |
2375 | return -EFAULT; |
2376 | |
2377 | sent += count; |
2378 | len -= count; |
2379 | |
2380 | skb->len += (*frag)->len; |
2381 | skb->data_len += (*frag)->len; |
2382 | |
2383 | frag = &(*frag)->next; |
2384 | } |
2385 | |
2386 | return sent; |
2387 | } |
2388 | |
2389 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
2390 | struct msghdr *msg, size_t len) |
2391 | { |
2392 | struct l2cap_conn *conn = chan->conn; |
2393 | struct sk_buff *skb; |
2394 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
2395 | struct l2cap_hdr *lh; |
2396 | |
2397 | BT_DBG("chan %p psm 0x%2.2x len %zu" , chan, |
2398 | __le16_to_cpu(chan->psm), len); |
2399 | |
2400 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2401 | |
2402 | skb = chan->ops->alloc_skb(chan, hlen, count, |
2403 | msg->msg_flags & MSG_DONTWAIT); |
2404 | if (IS_ERR(ptr: skb)) |
2405 | return skb; |
2406 | |
2407 | /* Create L2CAP header */ |
2408 | lh = skb_put(skb, L2CAP_HDR_SIZE); |
2409 | lh->cid = cpu_to_le16(chan->dcid); |
2410 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
2411 | put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE)); |
2412 | |
2413 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
2414 | if (unlikely(err < 0)) { |
2415 | kfree_skb(skb); |
2416 | return ERR_PTR(error: err); |
2417 | } |
2418 | return skb; |
2419 | } |
2420 | |
2421 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
2422 | struct msghdr *msg, size_t len) |
2423 | { |
2424 | struct l2cap_conn *conn = chan->conn; |
2425 | struct sk_buff *skb; |
2426 | int err, count; |
2427 | struct l2cap_hdr *lh; |
2428 | |
2429 | BT_DBG("chan %p len %zu" , chan, len); |
2430 | |
2431 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2432 | |
2433 | skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count, |
2434 | msg->msg_flags & MSG_DONTWAIT); |
2435 | if (IS_ERR(ptr: skb)) |
2436 | return skb; |
2437 | |
2438 | /* Create L2CAP header */ |
2439 | lh = skb_put(skb, L2CAP_HDR_SIZE); |
2440 | lh->cid = cpu_to_le16(chan->dcid); |
2441 | lh->len = cpu_to_le16(len); |
2442 | |
2443 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
2444 | if (unlikely(err < 0)) { |
2445 | kfree_skb(skb); |
2446 | return ERR_PTR(error: err); |
2447 | } |
2448 | return skb; |
2449 | } |
2450 | |
2451 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
2452 | struct msghdr *msg, size_t len, |
2453 | u16 sdulen) |
2454 | { |
2455 | struct l2cap_conn *conn = chan->conn; |
2456 | struct sk_buff *skb; |
2457 | int err, count, hlen; |
2458 | struct l2cap_hdr *lh; |
2459 | |
2460 | BT_DBG("chan %p len %zu" , chan, len); |
2461 | |
2462 | if (!conn) |
2463 | return ERR_PTR(error: -ENOTCONN); |
2464 | |
2465 | hlen = __ertm_hdr_size(chan); |
2466 | |
2467 | if (sdulen) |
2468 | hlen += L2CAP_SDULEN_SIZE; |
2469 | |
2470 | if (chan->fcs == L2CAP_FCS_CRC16) |
2471 | hlen += L2CAP_FCS_SIZE; |
2472 | |
2473 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2474 | |
2475 | skb = chan->ops->alloc_skb(chan, hlen, count, |
2476 | msg->msg_flags & MSG_DONTWAIT); |
2477 | if (IS_ERR(ptr: skb)) |
2478 | return skb; |
2479 | |
2480 | /* Create L2CAP header */ |
2481 | lh = skb_put(skb, L2CAP_HDR_SIZE); |
2482 | lh->cid = cpu_to_le16(chan->dcid); |
2483 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
2484 | |
2485 | /* Control header is populated later */ |
2486 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
2487 | put_unaligned_le32(val: 0, p: skb_put(skb, L2CAP_EXT_CTRL_SIZE)); |
2488 | else |
2489 | put_unaligned_le16(val: 0, p: skb_put(skb, L2CAP_ENH_CTRL_SIZE)); |
2490 | |
2491 | if (sdulen) |
2492 | put_unaligned_le16(val: sdulen, p: skb_put(skb, L2CAP_SDULEN_SIZE)); |
2493 | |
2494 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
2495 | if (unlikely(err < 0)) { |
2496 | kfree_skb(skb); |
2497 | return ERR_PTR(error: err); |
2498 | } |
2499 | |
2500 | bt_cb(skb)->l2cap.fcs = chan->fcs; |
2501 | bt_cb(skb)->l2cap.retries = 0; |
2502 | return skb; |
2503 | } |
2504 | |
2505 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
2506 | struct sk_buff_head *seg_queue, |
2507 | struct msghdr *msg, size_t len) |
2508 | { |
2509 | struct sk_buff *skb; |
2510 | u16 sdu_len; |
2511 | size_t pdu_len; |
2512 | u8 sar; |
2513 | |
2514 | BT_DBG("chan %p, msg %p, len %zu" , chan, msg, len); |
2515 | |
2516 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2517 | * so fragmented skbs are not used. The HCI layer's handling |
2518 | * of fragmented skbs is not compatible with ERTM's queueing. |
2519 | */ |
2520 | |
2521 | /* PDU size is derived from the HCI MTU */ |
2522 | pdu_len = chan->conn->mtu; |
2523 | |
2524 | /* Constrain PDU size for BR/EDR connections */ |
2525 | if (!chan->hs_hcon) |
2526 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2527 | |
2528 | /* Adjust for largest possible L2CAP overhead. */ |
2529 | if (chan->fcs) |
2530 | pdu_len -= L2CAP_FCS_SIZE; |
2531 | |
2532 | pdu_len -= __ertm_hdr_size(chan); |
2533 | |
2534 | /* Remote device may have requested smaller PDUs */ |
2535 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); |
2536 | |
2537 | if (len <= pdu_len) { |
2538 | sar = L2CAP_SAR_UNSEGMENTED; |
2539 | sdu_len = 0; |
2540 | pdu_len = len; |
2541 | } else { |
2542 | sar = L2CAP_SAR_START; |
2543 | sdu_len = len; |
2544 | } |
2545 | |
2546 | while (len > 0) { |
2547 | skb = l2cap_create_iframe_pdu(chan, msg, len: pdu_len, sdulen: sdu_len); |
2548 | |
2549 | if (IS_ERR(ptr: skb)) { |
2550 | __skb_queue_purge(list: seg_queue); |
2551 | return PTR_ERR(ptr: skb); |
2552 | } |
2553 | |
2554 | bt_cb(skb)->l2cap.sar = sar; |
2555 | __skb_queue_tail(list: seg_queue, newsk: skb); |
2556 | |
2557 | len -= pdu_len; |
2558 | if (sdu_len) |
2559 | sdu_len = 0; |
2560 | |
2561 | if (len <= pdu_len) { |
2562 | sar = L2CAP_SAR_END; |
2563 | pdu_len = len; |
2564 | } else { |
2565 | sar = L2CAP_SAR_CONTINUE; |
2566 | } |
2567 | } |
2568 | |
2569 | return 0; |
2570 | } |
2571 | |
2572 | static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan, |
2573 | struct msghdr *msg, |
2574 | size_t len, u16 sdulen) |
2575 | { |
2576 | struct l2cap_conn *conn = chan->conn; |
2577 | struct sk_buff *skb; |
2578 | int err, count, hlen; |
2579 | struct l2cap_hdr *lh; |
2580 | |
2581 | BT_DBG("chan %p len %zu" , chan, len); |
2582 | |
2583 | if (!conn) |
2584 | return ERR_PTR(error: -ENOTCONN); |
2585 | |
2586 | hlen = L2CAP_HDR_SIZE; |
2587 | |
2588 | if (sdulen) |
2589 | hlen += L2CAP_SDULEN_SIZE; |
2590 | |
2591 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2592 | |
2593 | skb = chan->ops->alloc_skb(chan, hlen, count, |
2594 | msg->msg_flags & MSG_DONTWAIT); |
2595 | if (IS_ERR(ptr: skb)) |
2596 | return skb; |
2597 | |
2598 | /* Create L2CAP header */ |
2599 | lh = skb_put(skb, L2CAP_HDR_SIZE); |
2600 | lh->cid = cpu_to_le16(chan->dcid); |
2601 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
2602 | |
2603 | if (sdulen) |
2604 | put_unaligned_le16(val: sdulen, p: skb_put(skb, L2CAP_SDULEN_SIZE)); |
2605 | |
2606 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
2607 | if (unlikely(err < 0)) { |
2608 | kfree_skb(skb); |
2609 | return ERR_PTR(error: err); |
2610 | } |
2611 | |
2612 | return skb; |
2613 | } |
2614 | |
2615 | static int l2cap_segment_le_sdu(struct l2cap_chan *chan, |
2616 | struct sk_buff_head *seg_queue, |
2617 | struct msghdr *msg, size_t len) |
2618 | { |
2619 | struct sk_buff *skb; |
2620 | size_t pdu_len; |
2621 | u16 sdu_len; |
2622 | |
2623 | BT_DBG("chan %p, msg %p, len %zu" , chan, msg, len); |
2624 | |
2625 | sdu_len = len; |
2626 | pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE; |
2627 | |
2628 | while (len > 0) { |
2629 | if (len <= pdu_len) |
2630 | pdu_len = len; |
2631 | |
2632 | skb = l2cap_create_le_flowctl_pdu(chan, msg, len: pdu_len, sdulen: sdu_len); |
2633 | if (IS_ERR(ptr: skb)) { |
2634 | __skb_queue_purge(list: seg_queue); |
2635 | return PTR_ERR(ptr: skb); |
2636 | } |
2637 | |
2638 | __skb_queue_tail(list: seg_queue, newsk: skb); |
2639 | |
2640 | len -= pdu_len; |
2641 | |
2642 | if (sdu_len) { |
2643 | sdu_len = 0; |
2644 | pdu_len += L2CAP_SDULEN_SIZE; |
2645 | } |
2646 | } |
2647 | |
2648 | return 0; |
2649 | } |
2650 | |
2651 | static void l2cap_le_flowctl_send(struct l2cap_chan *chan) |
2652 | { |
2653 | int sent = 0; |
2654 | |
2655 | BT_DBG("chan %p" , chan); |
2656 | |
2657 | while (chan->tx_credits && !skb_queue_empty(list: &chan->tx_q)) { |
2658 | l2cap_do_send(chan, skb: skb_dequeue(list: &chan->tx_q)); |
2659 | chan->tx_credits--; |
2660 | sent++; |
2661 | } |
2662 | |
2663 | BT_DBG("Sent %d credits %u queued %u" , sent, chan->tx_credits, |
2664 | skb_queue_len(&chan->tx_q)); |
2665 | } |
2666 | |
2667 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
2668 | { |
2669 | struct sk_buff *skb; |
2670 | int err; |
2671 | struct sk_buff_head seg_queue; |
2672 | |
2673 | if (!chan->conn) |
2674 | return -ENOTCONN; |
2675 | |
2676 | /* Connectionless channel */ |
2677 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
2678 | skb = l2cap_create_connless_pdu(chan, msg, len); |
2679 | if (IS_ERR(ptr: skb)) |
2680 | return PTR_ERR(ptr: skb); |
2681 | |
2682 | l2cap_do_send(chan, skb); |
2683 | return len; |
2684 | } |
2685 | |
2686 | switch (chan->mode) { |
2687 | case L2CAP_MODE_LE_FLOWCTL: |
2688 | case L2CAP_MODE_EXT_FLOWCTL: |
2689 | /* Check outgoing MTU */ |
2690 | if (len > chan->omtu) |
2691 | return -EMSGSIZE; |
2692 | |
2693 | __skb_queue_head_init(list: &seg_queue); |
2694 | |
2695 | err = l2cap_segment_le_sdu(chan, seg_queue: &seg_queue, msg, len); |
2696 | |
2697 | if (chan->state != BT_CONNECTED) { |
2698 | __skb_queue_purge(list: &seg_queue); |
2699 | err = -ENOTCONN; |
2700 | } |
2701 | |
2702 | if (err) |
2703 | return err; |
2704 | |
2705 | skb_queue_splice_tail_init(list: &seg_queue, head: &chan->tx_q); |
2706 | |
2707 | l2cap_le_flowctl_send(chan); |
2708 | |
2709 | if (!chan->tx_credits) |
2710 | chan->ops->suspend(chan); |
2711 | |
2712 | err = len; |
2713 | |
2714 | break; |
2715 | |
2716 | case L2CAP_MODE_BASIC: |
2717 | /* Check outgoing MTU */ |
2718 | if (len > chan->omtu) |
2719 | return -EMSGSIZE; |
2720 | |
2721 | /* Create a basic PDU */ |
2722 | skb = l2cap_create_basic_pdu(chan, msg, len); |
2723 | if (IS_ERR(ptr: skb)) |
2724 | return PTR_ERR(ptr: skb); |
2725 | |
2726 | l2cap_do_send(chan, skb); |
2727 | err = len; |
2728 | break; |
2729 | |
2730 | case L2CAP_MODE_ERTM: |
2731 | case L2CAP_MODE_STREAMING: |
2732 | /* Check outgoing MTU */ |
2733 | if (len > chan->omtu) { |
2734 | err = -EMSGSIZE; |
2735 | break; |
2736 | } |
2737 | |
2738 | __skb_queue_head_init(list: &seg_queue); |
2739 | |
2740 | /* Do segmentation before calling in to the state machine, |
2741 | * since it's possible to block while waiting for memory |
2742 | * allocation. |
2743 | */ |
2744 | err = l2cap_segment_sdu(chan, seg_queue: &seg_queue, msg, len); |
2745 | |
2746 | if (err) |
2747 | break; |
2748 | |
2749 | if (chan->mode == L2CAP_MODE_ERTM) |
2750 | l2cap_tx(chan, NULL, skbs: &seg_queue, event: L2CAP_EV_DATA_REQUEST); |
2751 | else |
2752 | l2cap_streaming_send(chan, skbs: &seg_queue); |
2753 | |
2754 | err = len; |
2755 | |
2756 | /* If the skbs were not queued for sending, they'll still be in |
2757 | * seg_queue and need to be purged. |
2758 | */ |
2759 | __skb_queue_purge(list: &seg_queue); |
2760 | break; |
2761 | |
2762 | default: |
2763 | BT_DBG("bad state %1.1x" , chan->mode); |
2764 | err = -EBADFD; |
2765 | } |
2766 | |
2767 | return err; |
2768 | } |
2769 | EXPORT_SYMBOL_GPL(l2cap_chan_send); |
2770 | |
2771 | static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq) |
2772 | { |
2773 | struct l2cap_ctrl control; |
2774 | u16 seq; |
2775 | |
2776 | BT_DBG("chan %p, txseq %u" , chan, txseq); |
2777 | |
2778 | memset(&control, 0, sizeof(control)); |
2779 | control.sframe = 1; |
2780 | control.super = L2CAP_SUPER_SREJ; |
2781 | |
2782 | for (seq = chan->expected_tx_seq; seq != txseq; |
2783 | seq = __next_seq(chan, seq)) { |
2784 | if (!l2cap_ertm_seq_in_queue(head: &chan->srej_q, seq)) { |
2785 | control.reqseq = seq; |
2786 | l2cap_send_sframe(chan, control: &control); |
2787 | l2cap_seq_list_append(seq_list: &chan->srej_list, seq); |
2788 | } |
2789 | } |
2790 | |
2791 | chan->expected_tx_seq = __next_seq(chan, seq: txseq); |
2792 | } |
2793 | |
2794 | static void l2cap_send_srej_tail(struct l2cap_chan *chan) |
2795 | { |
2796 | struct l2cap_ctrl control; |
2797 | |
2798 | BT_DBG("chan %p" , chan); |
2799 | |
2800 | if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR) |
2801 | return; |
2802 | |
2803 | memset(&control, 0, sizeof(control)); |
2804 | control.sframe = 1; |
2805 | control.super = L2CAP_SUPER_SREJ; |
2806 | control.reqseq = chan->srej_list.tail; |
2807 | l2cap_send_sframe(chan, control: &control); |
2808 | } |
2809 | |
2810 | static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq) |
2811 | { |
2812 | struct l2cap_ctrl control; |
2813 | u16 initial_head; |
2814 | u16 seq; |
2815 | |
2816 | BT_DBG("chan %p, txseq %u" , chan, txseq); |
2817 | |
2818 | memset(&control, 0, sizeof(control)); |
2819 | control.sframe = 1; |
2820 | control.super = L2CAP_SUPER_SREJ; |
2821 | |
2822 | /* Capture initial list head to allow only one pass through the list. */ |
2823 | initial_head = chan->srej_list.head; |
2824 | |
2825 | do { |
2826 | seq = l2cap_seq_list_pop(seq_list: &chan->srej_list); |
2827 | if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR) |
2828 | break; |
2829 | |
2830 | control.reqseq = seq; |
2831 | l2cap_send_sframe(chan, control: &control); |
2832 | l2cap_seq_list_append(seq_list: &chan->srej_list, seq); |
2833 | } while (chan->srej_list.head != initial_head); |
2834 | } |
2835 | |
2836 | static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq) |
2837 | { |
2838 | struct sk_buff *acked_skb; |
2839 | u16 ackseq; |
2840 | |
2841 | BT_DBG("chan %p, reqseq %u" , chan, reqseq); |
2842 | |
2843 | if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq) |
2844 | return; |
2845 | |
2846 | BT_DBG("expected_ack_seq %u, unacked_frames %u" , |
2847 | chan->expected_ack_seq, chan->unacked_frames); |
2848 | |
2849 | for (ackseq = chan->expected_ack_seq; ackseq != reqseq; |
2850 | ackseq = __next_seq(chan, seq: ackseq)) { |
2851 | |
2852 | acked_skb = l2cap_ertm_seq_in_queue(head: &chan->tx_q, seq: ackseq); |
2853 | if (acked_skb) { |
2854 | skb_unlink(skb: acked_skb, list: &chan->tx_q); |
2855 | kfree_skb(skb: acked_skb); |
2856 | chan->unacked_frames--; |
2857 | } |
2858 | } |
2859 | |
2860 | chan->expected_ack_seq = reqseq; |
2861 | |
2862 | if (chan->unacked_frames == 0) |
2863 | __clear_retrans_timer(chan); |
2864 | |
2865 | BT_DBG("unacked_frames %u" , chan->unacked_frames); |
2866 | } |
2867 | |
2868 | static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan) |
2869 | { |
2870 | BT_DBG("chan %p" , chan); |
2871 | |
2872 | chan->expected_tx_seq = chan->buffer_seq; |
2873 | l2cap_seq_list_clear(seq_list: &chan->srej_list); |
2874 | skb_queue_purge(list: &chan->srej_q); |
2875 | chan->rx_state = L2CAP_RX_STATE_RECV; |
2876 | } |
2877 | |
2878 | static void l2cap_tx_state_xmit(struct l2cap_chan *chan, |
2879 | struct l2cap_ctrl *control, |
2880 | struct sk_buff_head *skbs, u8 event) |
2881 | { |
2882 | BT_DBG("chan %p, control %p, skbs %p, event %d" , chan, control, skbs, |
2883 | event); |
2884 | |
2885 | switch (event) { |
2886 | case L2CAP_EV_DATA_REQUEST: |
2887 | if (chan->tx_send_head == NULL) |
2888 | chan->tx_send_head = skb_peek(list_: skbs); |
2889 | |
2890 | skb_queue_splice_tail_init(list: skbs, head: &chan->tx_q); |
2891 | l2cap_ertm_send(chan); |
2892 | break; |
2893 | case L2CAP_EV_LOCAL_BUSY_DETECTED: |
2894 | BT_DBG("Enter LOCAL_BUSY" ); |
2895 | set_bit(nr: CONN_LOCAL_BUSY, addr: &chan->conn_state); |
2896 | |
2897 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { |
2898 | /* The SREJ_SENT state must be aborted if we are to |
2899 | * enter the LOCAL_BUSY state. |
2900 | */ |
2901 | l2cap_abort_rx_srej_sent(chan); |
2902 | } |
2903 | |
2904 | l2cap_send_ack(chan); |
2905 | |
2906 | break; |
2907 | case L2CAP_EV_LOCAL_BUSY_CLEAR: |
2908 | BT_DBG("Exit LOCAL_BUSY" ); |
2909 | clear_bit(nr: CONN_LOCAL_BUSY, addr: &chan->conn_state); |
2910 | |
2911 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { |
2912 | struct l2cap_ctrl local_control; |
2913 | |
2914 | memset(&local_control, 0, sizeof(local_control)); |
2915 | local_control.sframe = 1; |
2916 | local_control.super = L2CAP_SUPER_RR; |
2917 | local_control.poll = 1; |
2918 | local_control.reqseq = chan->buffer_seq; |
2919 | l2cap_send_sframe(chan, control: &local_control); |
2920 | |
2921 | chan->retry_count = 1; |
2922 | __set_monitor_timer(chan); |
2923 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
2924 | } |
2925 | break; |
2926 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: |
2927 | l2cap_process_reqseq(chan, reqseq: control->reqseq); |
2928 | break; |
2929 | case L2CAP_EV_EXPLICIT_POLL: |
2930 | l2cap_send_rr_or_rnr(chan, poll: 1); |
2931 | chan->retry_count = 1; |
2932 | __set_monitor_timer(chan); |
2933 | __clear_ack_timer(chan); |
2934 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
2935 | break; |
2936 | case L2CAP_EV_RETRANS_TO: |
2937 | l2cap_send_rr_or_rnr(chan, poll: 1); |
2938 | chan->retry_count = 1; |
2939 | __set_monitor_timer(chan); |
2940 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
2941 | break; |
2942 | case L2CAP_EV_RECV_FBIT: |
2943 | /* Nothing to process */ |
2944 | break; |
2945 | default: |
2946 | break; |
2947 | } |
2948 | } |
2949 | |
2950 | static void l2cap_tx_state_wait_f(struct l2cap_chan *chan, |
2951 | struct l2cap_ctrl *control, |
2952 | struct sk_buff_head *skbs, u8 event) |
2953 | { |
2954 | BT_DBG("chan %p, control %p, skbs %p, event %d" , chan, control, skbs, |
2955 | event); |
2956 | |
2957 | switch (event) { |
2958 | case L2CAP_EV_DATA_REQUEST: |
2959 | if (chan->tx_send_head == NULL) |
2960 | chan->tx_send_head = skb_peek(list_: skbs); |
2961 | /* Queue data, but don't send. */ |
2962 | skb_queue_splice_tail_init(list: skbs, head: &chan->tx_q); |
2963 | break; |
2964 | case L2CAP_EV_LOCAL_BUSY_DETECTED: |
2965 | BT_DBG("Enter LOCAL_BUSY" ); |
2966 | set_bit(nr: CONN_LOCAL_BUSY, addr: &chan->conn_state); |
2967 | |
2968 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { |
2969 | /* The SREJ_SENT state must be aborted if we are to |
2970 | * enter the LOCAL_BUSY state. |
2971 | */ |
2972 | l2cap_abort_rx_srej_sent(chan); |
2973 | } |
2974 | |
2975 | l2cap_send_ack(chan); |
2976 | |
2977 | break; |
2978 | case L2CAP_EV_LOCAL_BUSY_CLEAR: |
2979 | BT_DBG("Exit LOCAL_BUSY" ); |
2980 | clear_bit(nr: CONN_LOCAL_BUSY, addr: &chan->conn_state); |
2981 | |
2982 | if (test_bit(CONN_RNR_SENT, &chan->conn_state)) { |
2983 | struct l2cap_ctrl local_control; |
2984 | memset(&local_control, 0, sizeof(local_control)); |
2985 | local_control.sframe = 1; |
2986 | local_control.super = L2CAP_SUPER_RR; |
2987 | local_control.poll = 1; |
2988 | local_control.reqseq = chan->buffer_seq; |
2989 | l2cap_send_sframe(chan, control: &local_control); |
2990 | |
2991 | chan->retry_count = 1; |
2992 | __set_monitor_timer(chan); |
2993 | chan->tx_state = L2CAP_TX_STATE_WAIT_F; |
2994 | } |
2995 | break; |
2996 | case L2CAP_EV_RECV_REQSEQ_AND_FBIT: |
2997 | l2cap_process_reqseq(chan, reqseq: control->reqseq); |
2998 | fallthrough; |
2999 | |
3000 | case L2CAP_EV_RECV_FBIT: |
3001 | if (control && control->final) { |
3002 | __clear_monitor_timer(chan); |
3003 | if (chan->unacked_frames > 0) |
3004 | __set_retrans_timer(chan); |
3005 | chan->retry_count = 0; |
3006 | chan->tx_state = L2CAP_TX_STATE_XMIT; |
3007 | BT_DBG("recv fbit tx_state 0x2.2%x" , chan->tx_state); |
3008 | } |
3009 | break; |
3010 | case L2CAP_EV_EXPLICIT_POLL: |
3011 | /* Ignore */ |
3012 | break; |
3013 | case L2CAP_EV_MONITOR_TO: |
3014 | if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) { |
3015 | l2cap_send_rr_or_rnr(chan, poll: 1); |
3016 | __set_monitor_timer(chan); |
3017 | chan->retry_count++; |
3018 | } else { |
3019 | l2cap_send_disconn_req(chan, ECONNABORTED); |
3020 | } |
3021 | break; |
3022 | default: |
3023 | break; |
3024 | } |
3025 | } |
3026 | |
3027 | static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
3028 | struct sk_buff_head *skbs, u8 event) |
3029 | { |
3030 | BT_DBG("chan %p, control %p, skbs %p, event %d, state %d" , |
3031 | chan, control, skbs, event, chan->tx_state); |
3032 | |
3033 | switch (chan->tx_state) { |
3034 | case L2CAP_TX_STATE_XMIT: |
3035 | l2cap_tx_state_xmit(chan, control, skbs, event); |
3036 | break; |
3037 | case L2CAP_TX_STATE_WAIT_F: |
3038 | l2cap_tx_state_wait_f(chan, control, skbs, event); |
3039 | break; |
3040 | default: |
3041 | /* Ignore event */ |
3042 | break; |
3043 | } |
3044 | } |
3045 | |
3046 | static void l2cap_pass_to_tx(struct l2cap_chan *chan, |
3047 | struct l2cap_ctrl *control) |
3048 | { |
3049 | BT_DBG("chan %p, control %p" , chan, control); |
3050 | l2cap_tx(chan, control, NULL, event: L2CAP_EV_RECV_REQSEQ_AND_FBIT); |
3051 | } |
3052 | |
3053 | static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan, |
3054 | struct l2cap_ctrl *control) |
3055 | { |
3056 | BT_DBG("chan %p, control %p" , chan, control); |
3057 | l2cap_tx(chan, control, NULL, event: L2CAP_EV_RECV_FBIT); |
3058 | } |
3059 | |
3060 | /* Copy frame to all raw sockets on that connection */ |
3061 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) |
3062 | { |
3063 | struct sk_buff *nskb; |
3064 | struct l2cap_chan *chan; |
3065 | |
3066 | BT_DBG("conn %p" , conn); |
3067 | |
3068 | mutex_lock(&conn->chan_lock); |
3069 | |
3070 | list_for_each_entry(chan, &conn->chan_l, list) { |
3071 | if (chan->chan_type != L2CAP_CHAN_RAW) |
3072 | continue; |
3073 | |
3074 | /* Don't send frame to the channel it came from */ |
3075 | if (bt_cb(skb)->l2cap.chan == chan) |
3076 | continue; |
3077 | |
3078 | nskb = skb_clone(skb, GFP_KERNEL); |
3079 | if (!nskb) |
3080 | continue; |
3081 | if (chan->ops->recv(chan, nskb)) |
3082 | kfree_skb(skb: nskb); |
3083 | } |
3084 | |
3085 | mutex_unlock(lock: &conn->chan_lock); |
3086 | } |
3087 | |
3088 | /* ---- L2CAP signalling commands ---- */ |
3089 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code, |
3090 | u8 ident, u16 dlen, void *data) |
3091 | { |
3092 | struct sk_buff *skb, **frag; |
3093 | struct l2cap_cmd_hdr *cmd; |
3094 | struct l2cap_hdr *lh; |
3095 | int len, count; |
3096 | |
3097 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u" , |
3098 | conn, code, ident, dlen); |
3099 | |
3100 | if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE) |
3101 | return NULL; |
3102 | |
3103 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
3104 | count = min_t(unsigned int, conn->mtu, len); |
3105 | |
3106 | skb = bt_skb_alloc(len: count, GFP_KERNEL); |
3107 | if (!skb) |
3108 | return NULL; |
3109 | |
3110 | lh = skb_put(skb, L2CAP_HDR_SIZE); |
3111 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3112 | |
3113 | if (conn->hcon->type == LE_LINK) |
3114 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); |
3115 | else |
3116 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
3117 | |
3118 | cmd = skb_put(skb, L2CAP_CMD_HDR_SIZE); |
3119 | cmd->code = code; |
3120 | cmd->ident = ident; |
3121 | cmd->len = cpu_to_le16(dlen); |
3122 | |
3123 | if (dlen) { |
3124 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; |
3125 | skb_put_data(skb, data, len: count); |
3126 | data += count; |
3127 | } |
3128 | |
3129 | len -= skb->len; |
3130 | |
3131 | /* Continuation fragments (no L2CAP header) */ |
3132 | frag = &skb_shinfo(skb)->frag_list; |
3133 | while (len) { |
3134 | count = min_t(unsigned int, conn->mtu, len); |
3135 | |
3136 | *frag = bt_skb_alloc(len: count, GFP_KERNEL); |
3137 | if (!*frag) |
3138 | goto fail; |
3139 | |
3140 | skb_put_data(skb: *frag, data, len: count); |
3141 | |
3142 | len -= count; |
3143 | data += count; |
3144 | |
3145 | frag = &(*frag)->next; |
3146 | } |
3147 | |
3148 | return skb; |
3149 | |
3150 | fail: |
3151 | kfree_skb(skb); |
3152 | return NULL; |
3153 | } |
3154 | |
3155 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, |
3156 | unsigned long *val) |
3157 | { |
3158 | struct l2cap_conf_opt *opt = *ptr; |
3159 | int len; |
3160 | |
3161 | len = L2CAP_CONF_OPT_SIZE + opt->len; |
3162 | *ptr += len; |
3163 | |
3164 | *type = opt->type; |
3165 | *olen = opt->len; |
3166 | |
3167 | switch (opt->len) { |
3168 | case 1: |
3169 | *val = *((u8 *) opt->val); |
3170 | break; |
3171 | |
3172 | case 2: |
3173 | *val = get_unaligned_le16(p: opt->val); |
3174 | break; |
3175 | |
3176 | case 4: |
3177 | *val = get_unaligned_le32(p: opt->val); |
3178 | break; |
3179 | |
3180 | default: |
3181 | *val = (unsigned long) opt->val; |
3182 | break; |
3183 | } |
3184 | |
3185 | BT_DBG("type 0x%2.2x len %u val 0x%lx" , *type, opt->len, *val); |
3186 | return len; |
3187 | } |
3188 | |
3189 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val, size_t size) |
3190 | { |
3191 | struct l2cap_conf_opt *opt = *ptr; |
3192 | |
3193 | BT_DBG("type 0x%2.2x len %u val 0x%lx" , type, len, val); |
3194 | |
3195 | if (size < L2CAP_CONF_OPT_SIZE + len) |
3196 | return; |
3197 | |
3198 | opt->type = type; |
3199 | opt->len = len; |
3200 | |
3201 | switch (len) { |
3202 | case 1: |
3203 | *((u8 *) opt->val) = val; |
3204 | break; |
3205 | |
3206 | case 2: |
3207 | put_unaligned_le16(val, p: opt->val); |
3208 | break; |
3209 | |
3210 | case 4: |
3211 | put_unaligned_le32(val, p: opt->val); |
3212 | break; |
3213 | |
3214 | default: |
3215 | memcpy(opt->val, (void *) val, len); |
3216 | break; |
3217 | } |
3218 | |
3219 | *ptr += L2CAP_CONF_OPT_SIZE + len; |
3220 | } |
3221 | |
3222 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan, size_t size) |
3223 | { |
3224 | struct l2cap_conf_efs efs; |
3225 | |
3226 | switch (chan->mode) { |
3227 | case L2CAP_MODE_ERTM: |
3228 | efs.id = chan->local_id; |
3229 | efs.stype = chan->local_stype; |
3230 | efs.msdu = cpu_to_le16(chan->local_msdu); |
3231 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); |
3232 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); |
3233 | efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO); |
3234 | break; |
3235 | |
3236 | case L2CAP_MODE_STREAMING: |
3237 | efs.id = 1; |
3238 | efs.stype = L2CAP_SERV_BESTEFFORT; |
3239 | efs.msdu = cpu_to_le16(chan->local_msdu); |
3240 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); |
3241 | efs.acc_lat = 0; |
3242 | efs.flush_to = 0; |
3243 | break; |
3244 | |
3245 | default: |
3246 | return; |
3247 | } |
3248 | |
3249 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, len: sizeof(efs), |
3250 | val: (unsigned long) &efs, size); |
3251 | } |
3252 | |
3253 | static void l2cap_ack_timeout(struct work_struct *work) |
3254 | { |
3255 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
3256 | ack_timer.work); |
3257 | u16 frames_to_ack; |
3258 | |
3259 | BT_DBG("chan %p" , chan); |
3260 | |
3261 | l2cap_chan_lock(chan); |
3262 | |
3263 | frames_to_ack = __seq_offset(chan, seq1: chan->buffer_seq, |
3264 | seq2: chan->last_acked_seq); |
3265 | |
3266 | if (frames_to_ack) |
3267 | l2cap_send_rr_or_rnr(chan, poll: 0); |
3268 | |
3269 | l2cap_chan_unlock(chan); |
3270 | l2cap_chan_put(chan); |
3271 | } |
3272 | |
3273 | int l2cap_ertm_init(struct l2cap_chan *chan) |
3274 | { |
3275 | int err; |
3276 | |
3277 | chan->next_tx_seq = 0; |
3278 | chan->expected_tx_seq = 0; |
3279 | chan->expected_ack_seq = 0; |
3280 | chan->unacked_frames = 0; |
3281 | chan->buffer_seq = 0; |
3282 | chan->frames_sent = 0; |
3283 | chan->last_acked_seq = 0; |
3284 | chan->sdu = NULL; |
3285 | chan->sdu_last_frag = NULL; |
3286 | chan->sdu_len = 0; |
3287 | |
3288 | skb_queue_head_init(list: &chan->tx_q); |
3289 | |
3290 | chan->local_amp_id = AMP_ID_BREDR; |
3291 | chan->move_id = AMP_ID_BREDR; |
3292 | chan->move_state = L2CAP_MOVE_STABLE; |
3293 | chan->move_role = L2CAP_MOVE_ROLE_NONE; |
3294 | |
3295 | if (chan->mode != L2CAP_MODE_ERTM) |
3296 | return 0; |
3297 | |
3298 | chan->rx_state = L2CAP_RX_STATE_RECV; |
3299 | chan->tx_state = L2CAP_TX_STATE_XMIT; |
3300 | |
3301 | skb_queue_head_init(list: &chan->srej_q); |
3302 | |
3303 | err = l2cap_seq_list_init(seq_list: &chan->srej_list, size: chan->tx_win); |
3304 | if (err < 0) |
3305 | return err; |
3306 | |
3307 | err = l2cap_seq_list_init(seq_list: &chan->retrans_list, size: chan->remote_tx_win); |
3308 | if (err < 0) |
3309 | l2cap_seq_list_free(seq_list: &chan->srej_list); |
3310 | |
3311 | return err; |
3312 | } |
3313 | |
3314 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
3315 | { |
3316 | switch (mode) { |
3317 | case L2CAP_MODE_STREAMING: |
3318 | case L2CAP_MODE_ERTM: |
3319 | if (l2cap_mode_supported(mode, feat_mask: remote_feat_mask)) |
3320 | return mode; |
3321 | fallthrough; |
3322 | default: |
3323 | return L2CAP_MODE_BASIC; |
3324 | } |
3325 | } |
3326 | |
3327 | static inline bool __l2cap_ews_supported(struct l2cap_conn *conn) |
3328 | { |
3329 | return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && |
3330 | (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW)); |
3331 | } |
3332 | |
3333 | static inline bool __l2cap_efs_supported(struct l2cap_conn *conn) |
3334 | { |
3335 | return ((conn->local_fixed_chan & L2CAP_FC_A2MP) && |
3336 | (conn->feat_mask & L2CAP_FEAT_EXT_FLOW)); |
3337 | } |
3338 | |
3339 | static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan, |
3340 | struct l2cap_conf_rfc *rfc) |
3341 | { |
3342 | if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) { |
3343 | u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to; |
3344 | |
3345 | /* Class 1 devices have must have ERTM timeouts |
3346 | * exceeding the Link Supervision Timeout. The |
3347 | * default Link Supervision Timeout for AMP |
3348 | * controllers is 10 seconds. |
3349 | * |
3350 | * Class 1 devices use 0xffffffff for their |
3351 | * best-effort flush timeout, so the clamping logic |
3352 | * will result in a timeout that meets the above |
3353 | * requirement. ERTM timeouts are 16-bit values, so |
3354 | * the maximum timeout is 65.535 seconds. |
3355 | */ |
3356 | |
3357 | /* Convert timeout to milliseconds and round */ |
3358 | ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000); |
3359 | |
3360 | /* This is the recommended formula for class 2 devices |
3361 | * that start ERTM timers when packets are sent to the |
3362 | * controller. |
3363 | */ |
3364 | ertm_to = 3 * ertm_to + 500; |
3365 | |
3366 | if (ertm_to > 0xffff) |
3367 | ertm_to = 0xffff; |
3368 | |
3369 | rfc->retrans_timeout = cpu_to_le16((u16) ertm_to); |
3370 | rfc->monitor_timeout = rfc->retrans_timeout; |
3371 | } else { |
3372 | rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
3373 | rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
3374 | } |
3375 | } |
3376 | |
3377 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
3378 | { |
3379 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && |
3380 | __l2cap_ews_supported(conn: chan->conn)) { |
3381 | /* use extended control field */ |
3382 | set_bit(nr: FLAG_EXT_CTRL, addr: &chan->flags); |
3383 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3384 | } else { |
3385 | chan->tx_win = min_t(u16, chan->tx_win, |
3386 | L2CAP_DEFAULT_TX_WINDOW); |
3387 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
3388 | } |
3389 | chan->ack_win = chan->tx_win; |
3390 | } |
3391 | |
3392 | static void l2cap_mtu_auto(struct l2cap_chan *chan) |
3393 | { |
3394 | struct hci_conn *conn = chan->conn->hcon; |
3395 | |
3396 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
3397 | |
3398 | /* The 2-DH1 packet has between 2 and 56 information bytes |
3399 | * (including the 2-byte payload header) |
3400 | */ |
3401 | if (!(conn->pkt_type & HCI_2DH1)) |
3402 | chan->imtu = 54; |
3403 | |
3404 | /* The 3-DH1 packet has between 2 and 85 information bytes |
3405 | * (including the 2-byte payload header) |
3406 | */ |
3407 | if (!(conn->pkt_type & HCI_3DH1)) |
3408 | chan->imtu = 83; |
3409 | |
3410 | /* The 2-DH3 packet has between 2 and 369 information bytes |
3411 | * (including the 2-byte payload header) |
3412 | */ |
3413 | if (!(conn->pkt_type & HCI_2DH3)) |
3414 | chan->imtu = 367; |
3415 | |
3416 | /* The 3-DH3 packet has between 2 and 554 information bytes |
3417 | * (including the 2-byte payload header) |
3418 | */ |
3419 | if (!(conn->pkt_type & HCI_3DH3)) |
3420 | chan->imtu = 552; |
3421 | |
3422 | /* The 2-DH5 packet has between 2 and 681 information bytes |
3423 | * (including the 2-byte payload header) |
3424 | */ |
3425 | if (!(conn->pkt_type & HCI_2DH5)) |
3426 | chan->imtu = 679; |
3427 | |
3428 | /* The 3-DH5 packet has between 2 and 1023 information bytes |
3429 | * (including the 2-byte payload header) |
3430 | */ |
3431 | if (!(conn->pkt_type & HCI_3DH5)) |
3432 | chan->imtu = 1021; |
3433 | } |
3434 | |
3435 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size) |
3436 | { |
3437 | struct l2cap_conf_req *req = data; |
3438 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
3439 | void *ptr = req->data; |
3440 | void *endptr = data + data_size; |
3441 | u16 size; |
3442 | |
3443 | BT_DBG("chan %p" , chan); |
3444 | |
3445 | if (chan->num_conf_req || chan->num_conf_rsp) |
3446 | goto done; |
3447 | |
3448 | switch (chan->mode) { |
3449 | case L2CAP_MODE_STREAMING: |
3450 | case L2CAP_MODE_ERTM: |
3451 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
3452 | break; |
3453 | |
3454 | if (__l2cap_efs_supported(conn: chan->conn)) |
3455 | set_bit(nr: FLAG_EFS_ENABLE, addr: &chan->flags); |
3456 | |
3457 | fallthrough; |
3458 | default: |
3459 | chan->mode = l2cap_select_mode(mode: rfc.mode, remote_feat_mask: chan->conn->feat_mask); |
3460 | break; |
3461 | } |
3462 | |
3463 | done: |
3464 | if (chan->imtu != L2CAP_DEFAULT_MTU) { |
3465 | if (!chan->imtu) |
3466 | l2cap_mtu_auto(chan); |
3467 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_MTU, len: 2, val: chan->imtu, |
3468 | size: endptr - ptr); |
3469 | } |
3470 | |
3471 | switch (chan->mode) { |
3472 | case L2CAP_MODE_BASIC: |
3473 | if (disable_ertm) |
3474 | break; |
3475 | |
3476 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
3477 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) |
3478 | break; |
3479 | |
3480 | rfc.mode = L2CAP_MODE_BASIC; |
3481 | rfc.txwin_size = 0; |
3482 | rfc.max_transmit = 0; |
3483 | rfc.retrans_timeout = 0; |
3484 | rfc.monitor_timeout = 0; |
3485 | rfc.max_pdu_size = 0; |
3486 | |
3487 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_RFC, len: sizeof(rfc), |
3488 | val: (unsigned long) &rfc, size: endptr - ptr); |
3489 | break; |
3490 | |
3491 | case L2CAP_MODE_ERTM: |
3492 | rfc.mode = L2CAP_MODE_ERTM; |
3493 | rfc.max_transmit = chan->max_tx; |
3494 | |
3495 | __l2cap_set_ertm_timeouts(chan, rfc: &rfc); |
3496 | |
3497 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - |
3498 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3499 | L2CAP_FCS_SIZE); |
3500 | rfc.max_pdu_size = cpu_to_le16(size); |
3501 | |
3502 | l2cap_txwin_setup(chan); |
3503 | |
3504 | rfc.txwin_size = min_t(u16, chan->tx_win, |
3505 | L2CAP_DEFAULT_TX_WINDOW); |
3506 | |
3507 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_RFC, len: sizeof(rfc), |
3508 | val: (unsigned long) &rfc, size: endptr - ptr); |
3509 | |
3510 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3511 | l2cap_add_opt_efs(ptr: &ptr, chan, size: endptr - ptr); |
3512 | |
3513 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3514 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_EWS, len: 2, |
3515 | val: chan->tx_win, size: endptr - ptr); |
3516 | |
3517 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3518 | if (chan->fcs == L2CAP_FCS_NONE || |
3519 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
3520 | chan->fcs = L2CAP_FCS_NONE; |
3521 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_FCS, len: 1, |
3522 | val: chan->fcs, size: endptr - ptr); |
3523 | } |
3524 | break; |
3525 | |
3526 | case L2CAP_MODE_STREAMING: |
3527 | l2cap_txwin_setup(chan); |
3528 | rfc.mode = L2CAP_MODE_STREAMING; |
3529 | rfc.txwin_size = 0; |
3530 | rfc.max_transmit = 0; |
3531 | rfc.retrans_timeout = 0; |
3532 | rfc.monitor_timeout = 0; |
3533 | |
3534 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - |
3535 | L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE - |
3536 | L2CAP_FCS_SIZE); |
3537 | rfc.max_pdu_size = cpu_to_le16(size); |
3538 | |
3539 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_RFC, len: sizeof(rfc), |
3540 | val: (unsigned long) &rfc, size: endptr - ptr); |
3541 | |
3542 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
3543 | l2cap_add_opt_efs(ptr: &ptr, chan, size: endptr - ptr); |
3544 | |
3545 | if (chan->conn->feat_mask & L2CAP_FEAT_FCS) |
3546 | if (chan->fcs == L2CAP_FCS_NONE || |
3547 | test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) { |
3548 | chan->fcs = L2CAP_FCS_NONE; |
3549 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_FCS, len: 1, |
3550 | val: chan->fcs, size: endptr - ptr); |
3551 | } |
3552 | break; |
3553 | } |
3554 | |
3555 | req->dcid = cpu_to_le16(chan->dcid); |
3556 | req->flags = cpu_to_le16(0); |
3557 | |
3558 | return ptr - data; |
3559 | } |
3560 | |
3561 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data, size_t data_size) |
3562 | { |
3563 | struct l2cap_conf_rsp *rsp = data; |
3564 | void *ptr = rsp->data; |
3565 | void *endptr = data + data_size; |
3566 | void *req = chan->conf_req; |
3567 | int len = chan->conf_len; |
3568 | int type, hint, olen; |
3569 | unsigned long val; |
3570 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
3571 | struct l2cap_conf_efs efs; |
3572 | u8 remote_efs = 0; |
3573 | u16 mtu = L2CAP_DEFAULT_MTU; |
3574 | u16 result = L2CAP_CONF_SUCCESS; |
3575 | u16 size; |
3576 | |
3577 | BT_DBG("chan %p" , chan); |
3578 | |
3579 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3580 | len -= l2cap_get_conf_opt(ptr: &req, type: &type, olen: &olen, val: &val); |
3581 | if (len < 0) |
3582 | break; |
3583 | |
3584 | hint = type & L2CAP_CONF_HINT; |
3585 | type &= L2CAP_CONF_MASK; |
3586 | |
3587 | switch (type) { |
3588 | case L2CAP_CONF_MTU: |
3589 | if (olen != 2) |
3590 | break; |
3591 | mtu = val; |
3592 | break; |
3593 | |
3594 | case L2CAP_CONF_FLUSH_TO: |
3595 | if (olen != 2) |
3596 | break; |
3597 | chan->flush_to = val; |
3598 | break; |
3599 | |
3600 | case L2CAP_CONF_QOS: |
3601 | break; |
3602 | |
3603 | case L2CAP_CONF_RFC: |
3604 | if (olen != sizeof(rfc)) |
3605 | break; |
3606 | memcpy(&rfc, (void *) val, olen); |
3607 | break; |
3608 | |
3609 | case L2CAP_CONF_FCS: |
3610 | if (olen != 1) |
3611 | break; |
3612 | if (val == L2CAP_FCS_NONE) |
3613 | set_bit(nr: CONF_RECV_NO_FCS, addr: &chan->conf_state); |
3614 | break; |
3615 | |
3616 | case L2CAP_CONF_EFS: |
3617 | if (olen != sizeof(efs)) |
3618 | break; |
3619 | remote_efs = 1; |
3620 | memcpy(&efs, (void *) val, olen); |
3621 | break; |
3622 | |
3623 | case L2CAP_CONF_EWS: |
3624 | if (olen != 2) |
3625 | break; |
3626 | if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP)) |
3627 | return -ECONNREFUSED; |
3628 | set_bit(nr: FLAG_EXT_CTRL, addr: &chan->flags); |
3629 | set_bit(nr: CONF_EWS_RECV, addr: &chan->conf_state); |
3630 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
3631 | chan->remote_tx_win = val; |
3632 | break; |
3633 | |
3634 | default: |
3635 | if (hint) |
3636 | break; |
3637 | result = L2CAP_CONF_UNKNOWN; |
3638 | l2cap_add_conf_opt(ptr: &ptr, type: (u8)type, len: sizeof(u8), val: type, size: endptr - ptr); |
3639 | break; |
3640 | } |
3641 | } |
3642 | |
3643 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
3644 | goto done; |
3645 | |
3646 | switch (chan->mode) { |
3647 | case L2CAP_MODE_STREAMING: |
3648 | case L2CAP_MODE_ERTM: |
3649 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
3650 | chan->mode = l2cap_select_mode(mode: rfc.mode, |
3651 | remote_feat_mask: chan->conn->feat_mask); |
3652 | break; |
3653 | } |
3654 | |
3655 | if (remote_efs) { |
3656 | if (__l2cap_efs_supported(conn: chan->conn)) |
3657 | set_bit(nr: FLAG_EFS_ENABLE, addr: &chan->flags); |
3658 | else |
3659 | return -ECONNREFUSED; |
3660 | } |
3661 | |
3662 | if (chan->mode != rfc.mode) |
3663 | return -ECONNREFUSED; |
3664 | |
3665 | break; |
3666 | } |
3667 | |
3668 | done: |
3669 | if (chan->mode != rfc.mode) { |
3670 | result = L2CAP_CONF_UNACCEPT; |
3671 | rfc.mode = chan->mode; |
3672 | |
3673 | if (chan->num_conf_rsp == 1) |
3674 | return -ECONNREFUSED; |
3675 | |
3676 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_RFC, len: sizeof(rfc), |
3677 | val: (unsigned long) &rfc, size: endptr - ptr); |
3678 | } |
3679 | |
3680 | if (result == L2CAP_CONF_SUCCESS) { |
3681 | /* Configure output options and let the other side know |
3682 | * which ones we don't like. */ |
3683 | |
3684 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
3685 | result = L2CAP_CONF_UNACCEPT; |
3686 | else { |
3687 | chan->omtu = mtu; |
3688 | set_bit(nr: CONF_MTU_DONE, addr: &chan->conf_state); |
3689 | } |
3690 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_MTU, len: 2, val: chan->omtu, size: endptr - ptr); |
3691 | |
3692 | if (remote_efs) { |
3693 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && |
3694 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3695 | efs.stype != chan->local_stype) { |
3696 | |
3697 | result = L2CAP_CONF_UNACCEPT; |
3698 | |
3699 | if (chan->num_conf_req >= 1) |
3700 | return -ECONNREFUSED; |
3701 | |
3702 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_EFS, |
3703 | len: sizeof(efs), |
3704 | val: (unsigned long) &efs, size: endptr - ptr); |
3705 | } else { |
3706 | /* Send PENDING Conf Rsp */ |
3707 | result = L2CAP_CONF_PENDING; |
3708 | set_bit(nr: CONF_LOC_CONF_PEND, addr: &chan->conf_state); |
3709 | } |
3710 | } |
3711 | |
3712 | switch (rfc.mode) { |
3713 | case L2CAP_MODE_BASIC: |
3714 | chan->fcs = L2CAP_FCS_NONE; |
3715 | set_bit(nr: CONF_MODE_DONE, addr: &chan->conf_state); |
3716 | break; |
3717 | |
3718 | case L2CAP_MODE_ERTM: |
3719 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
3720 | chan->remote_tx_win = rfc.txwin_size; |
3721 | else |
3722 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; |
3723 | |
3724 | chan->remote_max_tx = rfc.max_transmit; |
3725 | |
3726 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3727 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3728 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); |
3729 | rfc.max_pdu_size = cpu_to_le16(size); |
3730 | chan->remote_mps = size; |
3731 | |
3732 | __l2cap_set_ertm_timeouts(chan, rfc: &rfc); |
3733 | |
3734 | set_bit(nr: CONF_MODE_DONE, addr: &chan->conf_state); |
3735 | |
3736 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_RFC, |
3737 | len: sizeof(rfc), val: (unsigned long) &rfc, size: endptr - ptr); |
3738 | |
3739 | if (remote_efs && |
3740 | test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3741 | chan->remote_id = efs.id; |
3742 | chan->remote_stype = efs.stype; |
3743 | chan->remote_msdu = le16_to_cpu(efs.msdu); |
3744 | chan->remote_flush_to = |
3745 | le32_to_cpu(efs.flush_to); |
3746 | chan->remote_acc_lat = |
3747 | le32_to_cpu(efs.acc_lat); |
3748 | chan->remote_sdu_itime = |
3749 | le32_to_cpu(efs.sdu_itime); |
3750 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_EFS, |
3751 | len: sizeof(efs), |
3752 | val: (unsigned long) &efs, size: endptr - ptr); |
3753 | } |
3754 | break; |
3755 | |
3756 | case L2CAP_MODE_STREAMING: |
3757 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
3758 | chan->conn->mtu - L2CAP_EXT_HDR_SIZE - |
3759 | L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE); |
3760 | rfc.max_pdu_size = cpu_to_le16(size); |
3761 | chan->remote_mps = size; |
3762 | |
3763 | set_bit(nr: CONF_MODE_DONE, addr: &chan->conf_state); |
3764 | |
3765 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_RFC, len: sizeof(rfc), |
3766 | val: (unsigned long) &rfc, size: endptr - ptr); |
3767 | |
3768 | break; |
3769 | |
3770 | default: |
3771 | result = L2CAP_CONF_UNACCEPT; |
3772 | |
3773 | memset(&rfc, 0, sizeof(rfc)); |
3774 | rfc.mode = chan->mode; |
3775 | } |
3776 | |
3777 | if (result == L2CAP_CONF_SUCCESS) |
3778 | set_bit(nr: CONF_OUTPUT_DONE, addr: &chan->conf_state); |
3779 | } |
3780 | rsp->scid = cpu_to_le16(chan->dcid); |
3781 | rsp->result = cpu_to_le16(result); |
3782 | rsp->flags = cpu_to_le16(0); |
3783 | |
3784 | return ptr - data; |
3785 | } |
3786 | |
3787 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, |
3788 | void *data, size_t size, u16 *result) |
3789 | { |
3790 | struct l2cap_conf_req *req = data; |
3791 | void *ptr = req->data; |
3792 | void *endptr = data + size; |
3793 | int type, olen; |
3794 | unsigned long val; |
3795 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
3796 | struct l2cap_conf_efs efs; |
3797 | |
3798 | BT_DBG("chan %p, rsp %p, len %d, req %p" , chan, rsp, len, data); |
3799 | |
3800 | while (len >= L2CAP_CONF_OPT_SIZE) { |
3801 | len -= l2cap_get_conf_opt(ptr: &rsp, type: &type, olen: &olen, val: &val); |
3802 | if (len < 0) |
3803 | break; |
3804 | |
3805 | switch (type) { |
3806 | case L2CAP_CONF_MTU: |
3807 | if (olen != 2) |
3808 | break; |
3809 | if (val < L2CAP_DEFAULT_MIN_MTU) { |
3810 | *result = L2CAP_CONF_UNACCEPT; |
3811 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
3812 | } else |
3813 | chan->imtu = val; |
3814 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_MTU, len: 2, val: chan->imtu, |
3815 | size: endptr - ptr); |
3816 | break; |
3817 | |
3818 | case L2CAP_CONF_FLUSH_TO: |
3819 | if (olen != 2) |
3820 | break; |
3821 | chan->flush_to = val; |
3822 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_FLUSH_TO, len: 2, |
3823 | val: chan->flush_to, size: endptr - ptr); |
3824 | break; |
3825 | |
3826 | case L2CAP_CONF_RFC: |
3827 | if (olen != sizeof(rfc)) |
3828 | break; |
3829 | memcpy(&rfc, (void *)val, olen); |
3830 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
3831 | rfc.mode != chan->mode) |
3832 | return -ECONNREFUSED; |
3833 | chan->fcs = 0; |
3834 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_RFC, len: sizeof(rfc), |
3835 | val: (unsigned long) &rfc, size: endptr - ptr); |
3836 | break; |
3837 | |
3838 | case L2CAP_CONF_EWS: |
3839 | if (olen != 2) |
3840 | break; |
3841 | chan->ack_win = min_t(u16, val, chan->ack_win); |
3842 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_EWS, len: 2, |
3843 | val: chan->tx_win, size: endptr - ptr); |
3844 | break; |
3845 | |
3846 | case L2CAP_CONF_EFS: |
3847 | if (olen != sizeof(efs)) |
3848 | break; |
3849 | memcpy(&efs, (void *)val, olen); |
3850 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && |
3851 | efs.stype != L2CAP_SERV_NOTRAFIC && |
3852 | efs.stype != chan->local_stype) |
3853 | return -ECONNREFUSED; |
3854 | l2cap_add_conf_opt(ptr: &ptr, L2CAP_CONF_EFS, len: sizeof(efs), |
3855 | val: (unsigned long) &efs, size: endptr - ptr); |
3856 | break; |
3857 | |
3858 | case L2CAP_CONF_FCS: |
3859 | if (olen != 1) |
3860 | break; |
3861 | if (*result == L2CAP_CONF_PENDING) |
3862 | if (val == L2CAP_FCS_NONE) |
3863 | set_bit(nr: CONF_RECV_NO_FCS, |
3864 | addr: &chan->conf_state); |
3865 | break; |
3866 | } |
3867 | } |
3868 | |
3869 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
3870 | return -ECONNREFUSED; |
3871 | |
3872 | chan->mode = rfc.mode; |
3873 | |
3874 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
3875 | switch (rfc.mode) { |
3876 | case L2CAP_MODE_ERTM: |
3877 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
3878 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); |
3879 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3880 | if (!test_bit(FLAG_EXT_CTRL, &chan->flags)) |
3881 | chan->ack_win = min_t(u16, chan->ack_win, |
3882 | rfc.txwin_size); |
3883 | |
3884 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
3885 | chan->local_msdu = le16_to_cpu(efs.msdu); |
3886 | chan->local_sdu_itime = |
3887 | le32_to_cpu(efs.sdu_itime); |
3888 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); |
3889 | chan->local_flush_to = |
3890 | le32_to_cpu(efs.flush_to); |
3891 | } |
3892 | break; |
3893 | |
3894 | case L2CAP_MODE_STREAMING: |
3895 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
3896 | } |
3897 | } |
3898 | |
3899 | req->dcid = cpu_to_le16(chan->dcid); |
3900 | req->flags = cpu_to_le16(0); |
3901 | |
3902 | return ptr - data; |
3903 | } |
3904 | |
3905 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, |
3906 | u16 result, u16 flags) |
3907 | { |
3908 | struct l2cap_conf_rsp *rsp = data; |
3909 | void *ptr = rsp->data; |
3910 | |
3911 | BT_DBG("chan %p" , chan); |
3912 | |
3913 | rsp->scid = cpu_to_le16(chan->dcid); |
3914 | rsp->result = cpu_to_le16(result); |
3915 | rsp->flags = cpu_to_le16(flags); |
3916 | |
3917 | return ptr - data; |
3918 | } |
3919 | |
3920 | void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan) |
3921 | { |
3922 | struct l2cap_le_conn_rsp rsp; |
3923 | struct l2cap_conn *conn = chan->conn; |
3924 | |
3925 | BT_DBG("chan %p" , chan); |
3926 | |
3927 | rsp.dcid = cpu_to_le16(chan->scid); |
3928 | rsp.mtu = cpu_to_le16(chan->imtu); |
3929 | rsp.mps = cpu_to_le16(chan->mps); |
3930 | rsp.credits = cpu_to_le16(chan->rx_credits); |
3931 | rsp.result = cpu_to_le16(L2CAP_CR_LE_SUCCESS); |
3932 | |
3933 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_LE_CONN_RSP, len: sizeof(rsp), |
3934 | data: &rsp); |
3935 | } |
3936 | |
3937 | static void l2cap_ecred_list_defer(struct l2cap_chan *chan, void *data) |
3938 | { |
3939 | int *result = data; |
3940 | |
3941 | if (*result || test_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags)) |
3942 | return; |
3943 | |
3944 | switch (chan->state) { |
3945 | case BT_CONNECT2: |
3946 | /* If channel still pending accept add to result */ |
3947 | (*result)++; |
3948 | return; |
3949 | case BT_CONNECTED: |
3950 | return; |
3951 | default: |
3952 | /* If not connected or pending accept it has been refused */ |
3953 | *result = -ECONNREFUSED; |
3954 | return; |
3955 | } |
3956 | } |
3957 | |
3958 | struct l2cap_ecred_rsp_data { |
3959 | struct { |
3960 | struct l2cap_ecred_conn_rsp rsp; |
3961 | __le16 scid[L2CAP_ECRED_MAX_CID]; |
3962 | } __packed pdu; |
3963 | int count; |
3964 | }; |
3965 | |
3966 | static void l2cap_ecred_rsp_defer(struct l2cap_chan *chan, void *data) |
3967 | { |
3968 | struct l2cap_ecred_rsp_data *rsp = data; |
3969 | |
3970 | if (test_bit(FLAG_ECRED_CONN_REQ_SENT, &chan->flags)) |
3971 | return; |
3972 | |
3973 | /* Reset ident so only one response is sent */ |
3974 | chan->ident = 0; |
3975 | |
3976 | /* Include all channels pending with the same ident */ |
3977 | if (!rsp->pdu.rsp.result) |
3978 | rsp->pdu.rsp.dcid[rsp->count++] = cpu_to_le16(chan->scid); |
3979 | else |
3980 | l2cap_chan_del(chan, ECONNRESET); |
3981 | } |
3982 | |
3983 | void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan) |
3984 | { |
3985 | struct l2cap_conn *conn = chan->conn; |
3986 | struct l2cap_ecred_rsp_data data; |
3987 | u16 id = chan->ident; |
3988 | int result = 0; |
3989 | |
3990 | if (!id) |
3991 | return; |
3992 | |
3993 | BT_DBG("chan %p id %d" , chan, id); |
3994 | |
3995 | memset(&data, 0, sizeof(data)); |
3996 | |
3997 | data.pdu.rsp.mtu = cpu_to_le16(chan->imtu); |
3998 | data.pdu.rsp.mps = cpu_to_le16(chan->mps); |
3999 | data.pdu.rsp.credits = cpu_to_le16(chan->rx_credits); |
4000 | data.pdu.rsp.result = cpu_to_le16(L2CAP_CR_LE_SUCCESS); |
4001 | |
4002 | /* Verify that all channels are ready */ |
4003 | __l2cap_chan_list_id(conn, id, func: l2cap_ecred_list_defer, data: &result); |
4004 | |
4005 | if (result > 0) |
4006 | return; |
4007 | |
4008 | if (result < 0) |
4009 | data.pdu.rsp.result = cpu_to_le16(L2CAP_CR_LE_AUTHORIZATION); |
4010 | |
4011 | /* Build response */ |
4012 | __l2cap_chan_list_id(conn, id, func: l2cap_ecred_rsp_defer, data: &data); |
4013 | |
4014 | l2cap_send_cmd(conn, ident: id, L2CAP_ECRED_CONN_RSP, |
4015 | len: sizeof(data.pdu.rsp) + (data.count * sizeof(__le16)), |
4016 | data: &data.pdu); |
4017 | } |
4018 | |
4019 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
4020 | { |
4021 | struct l2cap_conn_rsp rsp; |
4022 | struct l2cap_conn *conn = chan->conn; |
4023 | u8 buf[128]; |
4024 | u8 rsp_code; |
4025 | |
4026 | rsp.scid = cpu_to_le16(chan->dcid); |
4027 | rsp.dcid = cpu_to_le16(chan->scid); |
4028 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
4029 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
4030 | |
4031 | if (chan->hs_hcon) |
4032 | rsp_code = L2CAP_CREATE_CHAN_RSP; |
4033 | else |
4034 | rsp_code = L2CAP_CONN_RSP; |
4035 | |
4036 | BT_DBG("chan %p rsp_code %u" , chan, rsp_code); |
4037 | |
4038 | l2cap_send_cmd(conn, ident: chan->ident, code: rsp_code, len: sizeof(rsp), data: &rsp); |
4039 | |
4040 | if (test_and_set_bit(nr: CONF_REQ_SENT, addr: &chan->conf_state)) |
4041 | return; |
4042 | |
4043 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), L2CAP_CONF_REQ, |
4044 | len: l2cap_build_conf_req(chan, data: buf, data_size: sizeof(buf)), data: buf); |
4045 | chan->num_conf_req++; |
4046 | } |
4047 | |
4048 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
4049 | { |
4050 | int type, olen; |
4051 | unsigned long val; |
4052 | /* Use sane default values in case a misbehaving remote device |
4053 | * did not send an RFC or extended window size option. |
4054 | */ |
4055 | u16 txwin_ext = chan->ack_win; |
4056 | struct l2cap_conf_rfc rfc = { |
4057 | .mode = chan->mode, |
4058 | .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO), |
4059 | .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO), |
4060 | .max_pdu_size = cpu_to_le16(chan->imtu), |
4061 | .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW), |
4062 | }; |
4063 | |
4064 | BT_DBG("chan %p, rsp %p, len %d" , chan, rsp, len); |
4065 | |
4066 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
4067 | return; |
4068 | |
4069 | while (len >= L2CAP_CONF_OPT_SIZE) { |
4070 | len -= l2cap_get_conf_opt(ptr: &rsp, type: &type, olen: &olen, val: &val); |
4071 | if (len < 0) |
4072 | break; |
4073 | |
4074 | switch (type) { |
4075 | case L2CAP_CONF_RFC: |
4076 | if (olen != sizeof(rfc)) |
4077 | break; |
4078 | memcpy(&rfc, (void *)val, olen); |
4079 | break; |
4080 | case L2CAP_CONF_EWS: |
4081 | if (olen != 2) |
4082 | break; |
4083 | txwin_ext = val; |
4084 | break; |
4085 | } |
4086 | } |
4087 | |
4088 | switch (rfc.mode) { |
4089 | case L2CAP_MODE_ERTM: |
4090 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
4091 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); |
4092 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
4093 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
4094 | chan->ack_win = min_t(u16, chan->ack_win, txwin_ext); |
4095 | else |
4096 | chan->ack_win = min_t(u16, chan->ack_win, |
4097 | rfc.txwin_size); |
4098 | break; |
4099 | case L2CAP_MODE_STREAMING: |
4100 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
4101 | } |
4102 | } |
4103 | |
4104 | static inline int l2cap_command_rej(struct l2cap_conn *conn, |
4105 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4106 | u8 *data) |
4107 | { |
4108 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4109 | |
4110 | if (cmd_len < sizeof(*rej)) |
4111 | return -EPROTO; |
4112 | |
4113 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4114 | return 0; |
4115 | |
4116 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && |
4117 | cmd->ident == conn->info_ident) { |
4118 | cancel_delayed_work(dwork: &conn->info_timer); |
4119 | |
4120 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
4121 | conn->info_ident = 0; |
4122 | |
4123 | l2cap_conn_start(conn); |
4124 | } |
4125 | |
4126 | return 0; |
4127 | } |
4128 | |
4129 | static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, |
4130 | struct l2cap_cmd_hdr *cmd, |
4131 | u8 *data, u8 rsp_code, u8 amp_id) |
4132 | { |
4133 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
4134 | struct l2cap_conn_rsp rsp; |
4135 | struct l2cap_chan *chan = NULL, *pchan; |
4136 | int result, status = L2CAP_CS_NO_INFO; |
4137 | |
4138 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); |
4139 | __le16 psm = req->psm; |
4140 | |
4141 | BT_DBG("psm 0x%2.2x scid 0x%4.4x" , __le16_to_cpu(psm), scid); |
4142 | |
4143 | /* Check if we have socket listening on psm */ |
4144 | pchan = l2cap_global_chan_by_psm(state: BT_LISTEN, psm, src: &conn->hcon->src, |
4145 | dst: &conn->hcon->dst, ACL_LINK); |
4146 | if (!pchan) { |
4147 | result = L2CAP_CR_BAD_PSM; |
4148 | goto sendresp; |
4149 | } |
4150 | |
4151 | mutex_lock(&conn->chan_lock); |
4152 | l2cap_chan_lock(chan: pchan); |
4153 | |
4154 | /* Check if the ACL is secure enough (if not SDP) */ |
4155 | if (psm != cpu_to_le16(L2CAP_PSM_SDP) && |
4156 | !hci_conn_check_link_mode(conn: conn->hcon)) { |
4157 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
4158 | result = L2CAP_CR_SEC_BLOCK; |
4159 | goto response; |
4160 | } |
4161 | |
4162 | result = L2CAP_CR_NO_MEM; |
4163 | |
4164 | /* Check for valid dynamic CID range (as per Erratum 3253) */ |
4165 | if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_DYN_END) { |
4166 | result = L2CAP_CR_INVALID_SCID; |
4167 | goto response; |
4168 | } |
4169 | |
4170 | /* Check if we already have channel with that dcid */ |
4171 | if (__l2cap_get_chan_by_dcid(conn, cid: scid)) { |
4172 | result = L2CAP_CR_SCID_IN_USE; |
4173 | goto response; |
4174 | } |
4175 | |
4176 | chan = pchan->ops->new_connection(pchan); |
4177 | if (!chan) |
4178 | goto response; |
4179 | |
4180 | /* For certain devices (ex: HID mouse), support for authentication, |
4181 | * pairing and bonding is optional. For such devices, inorder to avoid |
4182 | * the ACL alive for too long after L2CAP disconnection, reset the ACL |
4183 | * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect. |
4184 | */ |
4185 | conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT; |
4186 | |
4187 | bacpy(dst: &chan->src, src: &conn->hcon->src); |
4188 | bacpy(dst: &chan->dst, src: &conn->hcon->dst); |
4189 | chan->src_type = bdaddr_src_type(hcon: conn->hcon); |
4190 | chan->dst_type = bdaddr_dst_type(hcon: conn->hcon); |
4191 | chan->psm = psm; |
4192 | chan->dcid = scid; |
4193 | chan->local_amp_id = amp_id; |
4194 | |
4195 | __l2cap_chan_add(conn, chan); |
4196 | |
4197 | dcid = chan->scid; |
4198 | |
4199 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
4200 | |
4201 | chan->ident = cmd->ident; |
4202 | |
4203 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4204 | if (l2cap_chan_check_security(chan, initiator: false)) { |
4205 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
4206 | l2cap_state_change(chan, state: BT_CONNECT2); |
4207 | result = L2CAP_CR_PEND; |
4208 | status = L2CAP_CS_AUTHOR_PEND; |
4209 | chan->ops->defer(chan); |
4210 | } else { |
4211 | /* Force pending result for AMP controllers. |
4212 | * The connection will succeed after the |
4213 | * physical link is up. |
4214 | */ |
4215 | if (amp_id == AMP_ID_BREDR) { |
4216 | l2cap_state_change(chan, state: BT_CONFIG); |
4217 | result = L2CAP_CR_SUCCESS; |
4218 | } else { |
4219 | l2cap_state_change(chan, state: BT_CONNECT2); |
4220 | result = L2CAP_CR_PEND; |
4221 | } |
4222 | status = L2CAP_CS_NO_INFO; |
4223 | } |
4224 | } else { |
4225 | l2cap_state_change(chan, state: BT_CONNECT2); |
4226 | result = L2CAP_CR_PEND; |
4227 | status = L2CAP_CS_AUTHEN_PEND; |
4228 | } |
4229 | } else { |
4230 | l2cap_state_change(chan, state: BT_CONNECT2); |
4231 | result = L2CAP_CR_PEND; |
4232 | status = L2CAP_CS_NO_INFO; |
4233 | } |
4234 | |
4235 | response: |
4236 | l2cap_chan_unlock(chan: pchan); |
4237 | mutex_unlock(lock: &conn->chan_lock); |
4238 | l2cap_chan_put(pchan); |
4239 | |
4240 | sendresp: |
4241 | rsp.scid = cpu_to_le16(scid); |
4242 | rsp.dcid = cpu_to_le16(dcid); |
4243 | rsp.result = cpu_to_le16(result); |
4244 | rsp.status = cpu_to_le16(status); |
4245 | l2cap_send_cmd(conn, ident: cmd->ident, code: rsp_code, len: sizeof(rsp), data: &rsp); |
4246 | |
4247 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { |
4248 | struct l2cap_info_req info; |
4249 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4250 | |
4251 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; |
4252 | conn->info_ident = l2cap_get_ident(conn); |
4253 | |
4254 | schedule_delayed_work(dwork: &conn->info_timer, L2CAP_INFO_TIMEOUT); |
4255 | |
4256 | l2cap_send_cmd(conn, ident: conn->info_ident, L2CAP_INFO_REQ, |
4257 | len: sizeof(info), data: &info); |
4258 | } |
4259 | |
4260 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
4261 | result == L2CAP_CR_SUCCESS) { |
4262 | u8 buf[128]; |
4263 | set_bit(nr: CONF_REQ_SENT, addr: &chan->conf_state); |
4264 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), L2CAP_CONF_REQ, |
4265 | len: l2cap_build_conf_req(chan, data: buf, data_size: sizeof(buf)), data: buf); |
4266 | chan->num_conf_req++; |
4267 | } |
4268 | |
4269 | return chan; |
4270 | } |
4271 | |
4272 | static int l2cap_connect_req(struct l2cap_conn *conn, |
4273 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
4274 | { |
4275 | struct hci_dev *hdev = conn->hcon->hdev; |
4276 | struct hci_conn *hcon = conn->hcon; |
4277 | |
4278 | if (cmd_len < sizeof(struct l2cap_conn_req)) |
4279 | return -EPROTO; |
4280 | |
4281 | hci_dev_lock(hdev); |
4282 | if (hci_dev_test_flag(hdev, HCI_MGMT) && |
4283 | !test_and_set_bit(nr: HCI_CONN_MGMT_CONNECTED, addr: &hcon->flags)) |
4284 | mgmt_device_connected(hdev, conn: hcon, NULL, name_len: 0); |
4285 | hci_dev_unlock(hdev); |
4286 | |
4287 | l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, amp_id: 0); |
4288 | return 0; |
4289 | } |
4290 | |
4291 | static int l2cap_connect_create_rsp(struct l2cap_conn *conn, |
4292 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4293 | u8 *data) |
4294 | { |
4295 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; |
4296 | u16 scid, dcid, result, status; |
4297 | struct l2cap_chan *chan; |
4298 | u8 req[128]; |
4299 | int err; |
4300 | |
4301 | if (cmd_len < sizeof(*rsp)) |
4302 | return -EPROTO; |
4303 | |
4304 | scid = __le16_to_cpu(rsp->scid); |
4305 | dcid = __le16_to_cpu(rsp->dcid); |
4306 | result = __le16_to_cpu(rsp->result); |
4307 | status = __le16_to_cpu(rsp->status); |
4308 | |
4309 | if (result == L2CAP_CR_SUCCESS && (dcid < L2CAP_CID_DYN_START || |
4310 | dcid > L2CAP_CID_DYN_END)) |
4311 | return -EPROTO; |
4312 | |
4313 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x" , |
4314 | dcid, scid, result, status); |
4315 | |
4316 | mutex_lock(&conn->chan_lock); |
4317 | |
4318 | if (scid) { |
4319 | chan = __l2cap_get_chan_by_scid(conn, cid: scid); |
4320 | if (!chan) { |
4321 | err = -EBADSLT; |
4322 | goto unlock; |
4323 | } |
4324 | } else { |
4325 | chan = __l2cap_get_chan_by_ident(conn, ident: cmd->ident); |
4326 | if (!chan) { |
4327 | err = -EBADSLT; |
4328 | goto unlock; |
4329 | } |
4330 | } |
4331 | |
4332 | chan = l2cap_chan_hold_unless_zero(c: chan); |
4333 | if (!chan) { |
4334 | err = -EBADSLT; |
4335 | goto unlock; |
4336 | } |
4337 | |
4338 | err = 0; |
4339 | |
4340 | l2cap_chan_lock(chan); |
4341 | |
4342 | switch (result) { |
4343 | case L2CAP_CR_SUCCESS: |
4344 | if (__l2cap_get_chan_by_dcid(conn, cid: dcid)) { |
4345 | err = -EBADSLT; |
4346 | break; |
4347 | } |
4348 | |
4349 | l2cap_state_change(chan, state: BT_CONFIG); |
4350 | chan->ident = 0; |
4351 | chan->dcid = dcid; |
4352 | clear_bit(nr: CONF_CONNECT_PEND, addr: &chan->conf_state); |
4353 | |
4354 | if (test_and_set_bit(nr: CONF_REQ_SENT, addr: &chan->conf_state)) |
4355 | break; |
4356 | |
4357 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), L2CAP_CONF_REQ, |
4358 | len: l2cap_build_conf_req(chan, data: req, data_size: sizeof(req)), data: req); |
4359 | chan->num_conf_req++; |
4360 | break; |
4361 | |
4362 | case L2CAP_CR_PEND: |
4363 | set_bit(nr: CONF_CONNECT_PEND, addr: &chan->conf_state); |
4364 | break; |
4365 | |
4366 | default: |
4367 | l2cap_chan_del(chan, ECONNREFUSED); |
4368 | break; |
4369 | } |
4370 | |
4371 | l2cap_chan_unlock(chan); |
4372 | l2cap_chan_put(chan); |
4373 | |
4374 | unlock: |
4375 | mutex_unlock(lock: &conn->chan_lock); |
4376 | |
4377 | return err; |
4378 | } |
4379 | |
4380 | static inline void set_default_fcs(struct l2cap_chan *chan) |
4381 | { |
4382 | /* FCS is enabled only in ERTM or streaming mode, if one or both |
4383 | * sides request it. |
4384 | */ |
4385 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
4386 | chan->fcs = L2CAP_FCS_NONE; |
4387 | else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) |
4388 | chan->fcs = L2CAP_FCS_CRC16; |
4389 | } |
4390 | |
4391 | static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data, |
4392 | u8 ident, u16 flags) |
4393 | { |
4394 | struct l2cap_conn *conn = chan->conn; |
4395 | |
4396 | BT_DBG("conn %p chan %p ident %d flags 0x%4.4x" , conn, chan, ident, |
4397 | flags); |
4398 | |
4399 | clear_bit(nr: CONF_LOC_CONF_PEND, addr: &chan->conf_state); |
4400 | set_bit(nr: CONF_OUTPUT_DONE, addr: &chan->conf_state); |
4401 | |
4402 | l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP, |
4403 | len: l2cap_build_conf_rsp(chan, data, |
4404 | L2CAP_CONF_SUCCESS, flags), data); |
4405 | } |
4406 | |
4407 | static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident, |
4408 | u16 scid, u16 dcid) |
4409 | { |
4410 | struct l2cap_cmd_rej_cid rej; |
4411 | |
4412 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); |
4413 | rej.scid = __cpu_to_le16(scid); |
4414 | rej.dcid = __cpu_to_le16(dcid); |
4415 | |
4416 | l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, len: sizeof(rej), data: &rej); |
4417 | } |
4418 | |
4419 | static inline int l2cap_config_req(struct l2cap_conn *conn, |
4420 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4421 | u8 *data) |
4422 | { |
4423 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; |
4424 | u16 dcid, flags; |
4425 | u8 rsp[64]; |
4426 | struct l2cap_chan *chan; |
4427 | int len, err = 0; |
4428 | |
4429 | if (cmd_len < sizeof(*req)) |
4430 | return -EPROTO; |
4431 | |
4432 | dcid = __le16_to_cpu(req->dcid); |
4433 | flags = __le16_to_cpu(req->flags); |
4434 | |
4435 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x" , dcid, flags); |
4436 | |
4437 | chan = l2cap_get_chan_by_scid(conn, cid: dcid); |
4438 | if (!chan) { |
4439 | cmd_reject_invalid_cid(conn, ident: cmd->ident, scid: dcid, dcid: 0); |
4440 | return 0; |
4441 | } |
4442 | |
4443 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2 && |
4444 | chan->state != BT_CONNECTED) { |
4445 | cmd_reject_invalid_cid(conn, ident: cmd->ident, scid: chan->scid, |
4446 | dcid: chan->dcid); |
4447 | goto unlock; |
4448 | } |
4449 | |
4450 | /* Reject if config buffer is too small. */ |
4451 | len = cmd_len - sizeof(*req); |
4452 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
4453 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_CONF_RSP, |
4454 | len: l2cap_build_conf_rsp(chan, data: rsp, |
4455 | L2CAP_CONF_REJECT, flags), data: rsp); |
4456 | goto unlock; |
4457 | } |
4458 | |
4459 | /* Store config. */ |
4460 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
4461 | chan->conf_len += len; |
4462 | |
4463 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) { |
4464 | /* Incomplete config. Send empty response. */ |
4465 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_CONF_RSP, |
4466 | len: l2cap_build_conf_rsp(chan, data: rsp, |
4467 | L2CAP_CONF_SUCCESS, flags), data: rsp); |
4468 | goto unlock; |
4469 | } |
4470 | |
4471 | /* Complete config. */ |
4472 | len = l2cap_parse_conf_req(chan, data: rsp, data_size: sizeof(rsp)); |
4473 | if (len < 0) { |
4474 | l2cap_send_disconn_req(chan, ECONNRESET); |
4475 | goto unlock; |
4476 | } |
4477 | |
4478 | chan->ident = cmd->ident; |
4479 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_CONF_RSP, len, data: rsp); |
4480 | if (chan->num_conf_rsp < L2CAP_CONF_MAX_CONF_RSP) |
4481 | chan->num_conf_rsp++; |
4482 | |
4483 | /* Reset config buffer. */ |
4484 | chan->conf_len = 0; |
4485 | |
4486 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
4487 | goto unlock; |
4488 | |
4489 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
4490 | set_default_fcs(chan); |
4491 | |
4492 | if (chan->mode == L2CAP_MODE_ERTM || |
4493 | chan->mode == L2CAP_MODE_STREAMING) |
4494 | err = l2cap_ertm_init(chan); |
4495 | |
4496 | if (err < 0) |
4497 | l2cap_send_disconn_req(chan, err: -err); |
4498 | else |
4499 | l2cap_chan_ready(chan); |
4500 | |
4501 | goto unlock; |
4502 | } |
4503 | |
4504 | if (!test_and_set_bit(nr: CONF_REQ_SENT, addr: &chan->conf_state)) { |
4505 | u8 buf[64]; |
4506 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), L2CAP_CONF_REQ, |
4507 | len: l2cap_build_conf_req(chan, data: buf, data_size: sizeof(buf)), data: buf); |
4508 | chan->num_conf_req++; |
4509 | } |
4510 | |
4511 | /* Got Conf Rsp PENDING from remote side and assume we sent |
4512 | Conf Rsp PENDING in the code above */ |
4513 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && |
4514 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
4515 | |
4516 | /* check compatibility */ |
4517 | |
4518 | /* Send rsp for BR/EDR channel */ |
4519 | if (!chan->hs_hcon) |
4520 | l2cap_send_efs_conf_rsp(chan, data: rsp, ident: cmd->ident, flags); |
4521 | else |
4522 | chan->ident = cmd->ident; |
4523 | } |
4524 | |
4525 | unlock: |
4526 | l2cap_chan_unlock(chan); |
4527 | l2cap_chan_put(chan); |
4528 | return err; |
4529 | } |
4530 | |
4531 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, |
4532 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4533 | u8 *data) |
4534 | { |
4535 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; |
4536 | u16 scid, flags, result; |
4537 | struct l2cap_chan *chan; |
4538 | int len = cmd_len - sizeof(*rsp); |
4539 | int err = 0; |
4540 | |
4541 | if (cmd_len < sizeof(*rsp)) |
4542 | return -EPROTO; |
4543 | |
4544 | scid = __le16_to_cpu(rsp->scid); |
4545 | flags = __le16_to_cpu(rsp->flags); |
4546 | result = __le16_to_cpu(rsp->result); |
4547 | |
4548 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d" , scid, flags, |
4549 | result, len); |
4550 | |
4551 | chan = l2cap_get_chan_by_scid(conn, cid: scid); |
4552 | if (!chan) |
4553 | return 0; |
4554 | |
4555 | switch (result) { |
4556 | case L2CAP_CONF_SUCCESS: |
4557 | l2cap_conf_rfc_get(chan, rsp: rsp->data, len); |
4558 | clear_bit(nr: CONF_REM_CONF_PEND, addr: &chan->conf_state); |
4559 | break; |
4560 | |
4561 | case L2CAP_CONF_PENDING: |
4562 | set_bit(nr: CONF_REM_CONF_PEND, addr: &chan->conf_state); |
4563 | |
4564 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { |
4565 | char buf[64]; |
4566 | |
4567 | len = l2cap_parse_conf_rsp(chan, rsp: rsp->data, len, |
4568 | data: buf, size: sizeof(buf), result: &result); |
4569 | if (len < 0) { |
4570 | l2cap_send_disconn_req(chan, ECONNRESET); |
4571 | goto done; |
4572 | } |
4573 | |
4574 | if (!chan->hs_hcon) { |
4575 | l2cap_send_efs_conf_rsp(chan, data: buf, ident: cmd->ident, |
4576 | flags: 0); |
4577 | } else { |
4578 | if (l2cap_check_efs(chan)) { |
4579 | amp_create_logical_link(chan); |
4580 | chan->ident = cmd->ident; |
4581 | } |
4582 | } |
4583 | } |
4584 | goto done; |
4585 | |
4586 | case L2CAP_CONF_UNKNOWN: |
4587 | case L2CAP_CONF_UNACCEPT: |
4588 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
4589 | char req[64]; |
4590 | |
4591 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
4592 | l2cap_send_disconn_req(chan, ECONNRESET); |
4593 | goto done; |
4594 | } |
4595 | |
4596 | /* throw out any old stored conf requests */ |
4597 | result = L2CAP_CONF_SUCCESS; |
4598 | len = l2cap_parse_conf_rsp(chan, rsp: rsp->data, len, |
4599 | data: req, size: sizeof(req), result: &result); |
4600 | if (len < 0) { |
4601 | l2cap_send_disconn_req(chan, ECONNRESET); |
4602 | goto done; |
4603 | } |
4604 | |
4605 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), |
4606 | L2CAP_CONF_REQ, len, data: req); |
4607 | chan->num_conf_req++; |
4608 | if (result != L2CAP_CONF_SUCCESS) |
4609 | goto done; |
4610 | break; |
4611 | } |
4612 | fallthrough; |
4613 | |
4614 | default: |
4615 | l2cap_chan_set_err(chan, ECONNRESET); |
4616 | |
4617 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
4618 | l2cap_send_disconn_req(chan, ECONNRESET); |
4619 | goto done; |
4620 | } |
4621 | |
4622 | if (flags & L2CAP_CONF_FLAG_CONTINUATION) |
4623 | goto done; |
4624 | |
4625 | set_bit(nr: CONF_INPUT_DONE, addr: &chan->conf_state); |
4626 | |
4627 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
4628 | set_default_fcs(chan); |
4629 | |
4630 | if (chan->mode == L2CAP_MODE_ERTM || |
4631 | chan->mode == L2CAP_MODE_STREAMING) |
4632 | err = l2cap_ertm_init(chan); |
4633 | |
4634 | if (err < 0) |
4635 | l2cap_send_disconn_req(chan, err: -err); |
4636 | else |
4637 | l2cap_chan_ready(chan); |
4638 | } |
4639 | |
4640 | done: |
4641 | l2cap_chan_unlock(chan); |
4642 | l2cap_chan_put(chan); |
4643 | return err; |
4644 | } |
4645 | |
4646 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, |
4647 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4648 | u8 *data) |
4649 | { |
4650 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; |
4651 | struct l2cap_disconn_rsp rsp; |
4652 | u16 dcid, scid; |
4653 | struct l2cap_chan *chan; |
4654 | |
4655 | if (cmd_len != sizeof(*req)) |
4656 | return -EPROTO; |
4657 | |
4658 | scid = __le16_to_cpu(req->scid); |
4659 | dcid = __le16_to_cpu(req->dcid); |
4660 | |
4661 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x" , scid, dcid); |
4662 | |
4663 | chan = l2cap_get_chan_by_scid(conn, cid: dcid); |
4664 | if (!chan) { |
4665 | cmd_reject_invalid_cid(conn, ident: cmd->ident, scid: dcid, dcid: scid); |
4666 | return 0; |
4667 | } |
4668 | |
4669 | rsp.dcid = cpu_to_le16(chan->scid); |
4670 | rsp.scid = cpu_to_le16(chan->dcid); |
4671 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_DISCONN_RSP, len: sizeof(rsp), data: &rsp); |
4672 | |
4673 | chan->ops->set_shutdown(chan); |
4674 | |
4675 | l2cap_chan_unlock(chan); |
4676 | mutex_lock(&conn->chan_lock); |
4677 | l2cap_chan_lock(chan); |
4678 | l2cap_chan_del(chan, ECONNRESET); |
4679 | mutex_unlock(lock: &conn->chan_lock); |
4680 | |
4681 | chan->ops->close(chan); |
4682 | |
4683 | l2cap_chan_unlock(chan); |
4684 | l2cap_chan_put(chan); |
4685 | |
4686 | return 0; |
4687 | } |
4688 | |
4689 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, |
4690 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4691 | u8 *data) |
4692 | { |
4693 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; |
4694 | u16 dcid, scid; |
4695 | struct l2cap_chan *chan; |
4696 | |
4697 | if (cmd_len != sizeof(*rsp)) |
4698 | return -EPROTO; |
4699 | |
4700 | scid = __le16_to_cpu(rsp->scid); |
4701 | dcid = __le16_to_cpu(rsp->dcid); |
4702 | |
4703 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x" , dcid, scid); |
4704 | |
4705 | chan = l2cap_get_chan_by_scid(conn, cid: scid); |
4706 | if (!chan) { |
4707 | return 0; |
4708 | } |
4709 | |
4710 | if (chan->state != BT_DISCONN) { |
4711 | l2cap_chan_unlock(chan); |
4712 | l2cap_chan_put(chan); |
4713 | return 0; |
4714 | } |
4715 | |
4716 | l2cap_chan_unlock(chan); |
4717 | mutex_lock(&conn->chan_lock); |
4718 | l2cap_chan_lock(chan); |
4719 | l2cap_chan_del(chan, 0); |
4720 | mutex_unlock(lock: &conn->chan_lock); |
4721 | |
4722 | chan->ops->close(chan); |
4723 | |
4724 | l2cap_chan_unlock(chan); |
4725 | l2cap_chan_put(chan); |
4726 | |
4727 | return 0; |
4728 | } |
4729 | |
4730 | static inline int l2cap_information_req(struct l2cap_conn *conn, |
4731 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4732 | u8 *data) |
4733 | { |
4734 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; |
4735 | u16 type; |
4736 | |
4737 | if (cmd_len != sizeof(*req)) |
4738 | return -EPROTO; |
4739 | |
4740 | type = __le16_to_cpu(req->type); |
4741 | |
4742 | BT_DBG("type 0x%4.4x" , type); |
4743 | |
4744 | if (type == L2CAP_IT_FEAT_MASK) { |
4745 | u8 buf[8]; |
4746 | u32 feat_mask = l2cap_feat_mask; |
4747 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
4748 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
4749 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); |
4750 | if (!disable_ertm) |
4751 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
4752 | | L2CAP_FEAT_FCS; |
4753 | if (conn->local_fixed_chan & L2CAP_FC_A2MP) |
4754 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
4755 | | L2CAP_FEAT_EXT_WINDOW; |
4756 | |
4757 | put_unaligned_le32(val: feat_mask, p: rsp->data); |
4758 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_INFO_RSP, len: sizeof(buf), |
4759 | data: buf); |
4760 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
4761 | u8 buf[12]; |
4762 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
4763 | |
4764 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4765 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); |
4766 | rsp->data[0] = conn->local_fixed_chan; |
4767 | memset(rsp->data + 1, 0, 7); |
4768 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_INFO_RSP, len: sizeof(buf), |
4769 | data: buf); |
4770 | } else { |
4771 | struct l2cap_info_rsp rsp; |
4772 | rsp.type = cpu_to_le16(type); |
4773 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); |
4774 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_INFO_RSP, len: sizeof(rsp), |
4775 | data: &rsp); |
4776 | } |
4777 | |
4778 | return 0; |
4779 | } |
4780 | |
4781 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, |
4782 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
4783 | u8 *data) |
4784 | { |
4785 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; |
4786 | u16 type, result; |
4787 | |
4788 | if (cmd_len < sizeof(*rsp)) |
4789 | return -EPROTO; |
4790 | |
4791 | type = __le16_to_cpu(rsp->type); |
4792 | result = __le16_to_cpu(rsp->result); |
4793 | |
4794 | BT_DBG("type 0x%4.4x result 0x%2.2x" , type, result); |
4795 | |
4796 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
4797 | if (cmd->ident != conn->info_ident || |
4798 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) |
4799 | return 0; |
4800 | |
4801 | cancel_delayed_work(dwork: &conn->info_timer); |
4802 | |
4803 | if (result != L2CAP_IR_SUCCESS) { |
4804 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
4805 | conn->info_ident = 0; |
4806 | |
4807 | l2cap_conn_start(conn); |
4808 | |
4809 | return 0; |
4810 | } |
4811 | |
4812 | switch (type) { |
4813 | case L2CAP_IT_FEAT_MASK: |
4814 | conn->feat_mask = get_unaligned_le32(p: rsp->data); |
4815 | |
4816 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
4817 | struct l2cap_info_req req; |
4818 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
4819 | |
4820 | conn->info_ident = l2cap_get_ident(conn); |
4821 | |
4822 | l2cap_send_cmd(conn, ident: conn->info_ident, |
4823 | L2CAP_INFO_REQ, len: sizeof(req), data: &req); |
4824 | } else { |
4825 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
4826 | conn->info_ident = 0; |
4827 | |
4828 | l2cap_conn_start(conn); |
4829 | } |
4830 | break; |
4831 | |
4832 | case L2CAP_IT_FIXED_CHAN: |
4833 | conn->remote_fixed_chan = rsp->data[0]; |
4834 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
4835 | conn->info_ident = 0; |
4836 | |
4837 | l2cap_conn_start(conn); |
4838 | break; |
4839 | } |
4840 | |
4841 | return 0; |
4842 | } |
4843 | |
4844 | static int l2cap_create_channel_req(struct l2cap_conn *conn, |
4845 | struct l2cap_cmd_hdr *cmd, |
4846 | u16 cmd_len, void *data) |
4847 | { |
4848 | struct l2cap_create_chan_req *req = data; |
4849 | struct l2cap_create_chan_rsp rsp; |
4850 | struct l2cap_chan *chan; |
4851 | struct hci_dev *hdev; |
4852 | u16 psm, scid; |
4853 | |
4854 | if (cmd_len != sizeof(*req)) |
4855 | return -EPROTO; |
4856 | |
4857 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
4858 | return -EINVAL; |
4859 | |
4860 | psm = le16_to_cpu(req->psm); |
4861 | scid = le16_to_cpu(req->scid); |
4862 | |
4863 | BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d" , psm, scid, req->amp_id); |
4864 | |
4865 | /* For controller id 0 make BR/EDR connection */ |
4866 | if (req->amp_id == AMP_ID_BREDR) { |
4867 | l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4868 | amp_id: req->amp_id); |
4869 | return 0; |
4870 | } |
4871 | |
4872 | /* Validate AMP controller id */ |
4873 | hdev = hci_dev_get(index: req->amp_id); |
4874 | if (!hdev) |
4875 | goto error; |
4876 | |
4877 | if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) { |
4878 | hci_dev_put(d: hdev); |
4879 | goto error; |
4880 | } |
4881 | |
4882 | chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP, |
4883 | amp_id: req->amp_id); |
4884 | if (chan) { |
4885 | struct amp_mgr *mgr = conn->hcon->amp_mgr; |
4886 | struct hci_conn *hs_hcon; |
4887 | |
4888 | hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, |
4889 | ba: &conn->hcon->dst); |
4890 | if (!hs_hcon) { |
4891 | hci_dev_put(d: hdev); |
4892 | cmd_reject_invalid_cid(conn, ident: cmd->ident, scid: chan->scid, |
4893 | dcid: chan->dcid); |
4894 | return 0; |
4895 | } |
4896 | |
4897 | BT_DBG("mgr %p bredr_chan %p hs_hcon %p" , mgr, chan, hs_hcon); |
4898 | |
4899 | mgr->bredr_chan = chan; |
4900 | chan->hs_hcon = hs_hcon; |
4901 | chan->fcs = L2CAP_FCS_NONE; |
4902 | conn->mtu = hdev->block_mtu; |
4903 | } |
4904 | |
4905 | hci_dev_put(d: hdev); |
4906 | |
4907 | return 0; |
4908 | |
4909 | error: |
4910 | rsp.dcid = 0; |
4911 | rsp.scid = cpu_to_le16(scid); |
4912 | rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP); |
4913 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
4914 | |
4915 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_CREATE_CHAN_RSP, |
4916 | len: sizeof(rsp), data: &rsp); |
4917 | |
4918 | return 0; |
4919 | } |
4920 | |
4921 | static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id) |
4922 | { |
4923 | struct l2cap_move_chan_req req; |
4924 | u8 ident; |
4925 | |
4926 | BT_DBG("chan %p, dest_amp_id %d" , chan, dest_amp_id); |
4927 | |
4928 | ident = l2cap_get_ident(conn: chan->conn); |
4929 | chan->ident = ident; |
4930 | |
4931 | req.icid = cpu_to_le16(chan->scid); |
4932 | req.dest_amp_id = dest_amp_id; |
4933 | |
4934 | l2cap_send_cmd(conn: chan->conn, ident, L2CAP_MOVE_CHAN_REQ, len: sizeof(req), |
4935 | data: &req); |
4936 | |
4937 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); |
4938 | } |
4939 | |
4940 | static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result) |
4941 | { |
4942 | struct l2cap_move_chan_rsp rsp; |
4943 | |
4944 | BT_DBG("chan %p, result 0x%4.4x" , chan, result); |
4945 | |
4946 | rsp.icid = cpu_to_le16(chan->dcid); |
4947 | rsp.result = cpu_to_le16(result); |
4948 | |
4949 | l2cap_send_cmd(conn: chan->conn, ident: chan->ident, L2CAP_MOVE_CHAN_RSP, |
4950 | len: sizeof(rsp), data: &rsp); |
4951 | } |
4952 | |
4953 | static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result) |
4954 | { |
4955 | struct l2cap_move_chan_cfm cfm; |
4956 | |
4957 | BT_DBG("chan %p, result 0x%4.4x" , chan, result); |
4958 | |
4959 | chan->ident = l2cap_get_ident(conn: chan->conn); |
4960 | |
4961 | cfm.icid = cpu_to_le16(chan->scid); |
4962 | cfm.result = cpu_to_le16(result); |
4963 | |
4964 | l2cap_send_cmd(conn: chan->conn, ident: chan->ident, L2CAP_MOVE_CHAN_CFM, |
4965 | len: sizeof(cfm), data: &cfm); |
4966 | |
4967 | __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT); |
4968 | } |
4969 | |
4970 | static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid) |
4971 | { |
4972 | struct l2cap_move_chan_cfm cfm; |
4973 | |
4974 | BT_DBG("conn %p, icid 0x%4.4x" , conn, icid); |
4975 | |
4976 | cfm.icid = cpu_to_le16(icid); |
4977 | cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED); |
4978 | |
4979 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM, |
4980 | len: sizeof(cfm), data: &cfm); |
4981 | } |
4982 | |
4983 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, |
4984 | u16 icid) |
4985 | { |
4986 | struct l2cap_move_chan_cfm_rsp rsp; |
4987 | |
4988 | BT_DBG("icid 0x%4.4x" , icid); |
4989 | |
4990 | rsp.icid = cpu_to_le16(icid); |
4991 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, len: sizeof(rsp), data: &rsp); |
4992 | } |
4993 | |
4994 | static void __release_logical_link(struct l2cap_chan *chan) |
4995 | { |
4996 | chan->hs_hchan = NULL; |
4997 | chan->hs_hcon = NULL; |
4998 | |
4999 | /* Placeholder - release the logical link */ |
5000 | } |
5001 | |
5002 | static void l2cap_logical_fail(struct l2cap_chan *chan) |
5003 | { |
5004 | /* Logical link setup failed */ |
5005 | if (chan->state != BT_CONNECTED) { |
5006 | /* Create channel failure, disconnect */ |
5007 | l2cap_send_disconn_req(chan, ECONNRESET); |
5008 | return; |
5009 | } |
5010 | |
5011 | switch (chan->move_role) { |
5012 | case L2CAP_MOVE_ROLE_RESPONDER: |
5013 | l2cap_move_done(chan); |
5014 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP); |
5015 | break; |
5016 | case L2CAP_MOVE_ROLE_INITIATOR: |
5017 | if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP || |
5018 | chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) { |
5019 | /* Remote has only sent pending or |
5020 | * success responses, clean up |
5021 | */ |
5022 | l2cap_move_done(chan); |
5023 | } |
5024 | |
5025 | /* Other amp move states imply that the move |
5026 | * has already aborted |
5027 | */ |
5028 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
5029 | break; |
5030 | } |
5031 | } |
5032 | |
5033 | static void l2cap_logical_finish_create(struct l2cap_chan *chan, |
5034 | struct hci_chan *hchan) |
5035 | { |
5036 | struct l2cap_conf_rsp rsp; |
5037 | |
5038 | chan->hs_hchan = hchan; |
5039 | chan->hs_hcon->l2cap_data = chan->conn; |
5040 | |
5041 | l2cap_send_efs_conf_rsp(chan, data: &rsp, ident: chan->ident, flags: 0); |
5042 | |
5043 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
5044 | int err; |
5045 | |
5046 | set_default_fcs(chan); |
5047 | |
5048 | err = l2cap_ertm_init(chan); |
5049 | if (err < 0) |
5050 | l2cap_send_disconn_req(chan, err: -err); |
5051 | else |
5052 | l2cap_chan_ready(chan); |
5053 | } |
5054 | } |
5055 | |
5056 | static void l2cap_logical_finish_move(struct l2cap_chan *chan, |
5057 | struct hci_chan *hchan) |
5058 | { |
5059 | chan->hs_hcon = hchan->conn; |
5060 | chan->hs_hcon->l2cap_data = chan->conn; |
5061 | |
5062 | BT_DBG("move_state %d" , chan->move_state); |
5063 | |
5064 | switch (chan->move_state) { |
5065 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: |
5066 | /* Move confirm will be sent after a success |
5067 | * response is received |
5068 | */ |
5069 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; |
5070 | break; |
5071 | case L2CAP_MOVE_WAIT_LOGICAL_CFM: |
5072 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
5073 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; |
5074 | } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { |
5075 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; |
5076 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); |
5077 | } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { |
5078 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; |
5079 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); |
5080 | } |
5081 | break; |
5082 | default: |
5083 | /* Move was not in expected state, free the channel */ |
5084 | __release_logical_link(chan); |
5085 | |
5086 | chan->move_state = L2CAP_MOVE_STABLE; |
5087 | } |
5088 | } |
5089 | |
5090 | /* Call with chan locked */ |
5091 | void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan, |
5092 | u8 status) |
5093 | { |
5094 | BT_DBG("chan %p, hchan %p, status %d" , chan, hchan, status); |
5095 | |
5096 | if (status) { |
5097 | l2cap_logical_fail(chan); |
5098 | __release_logical_link(chan); |
5099 | return; |
5100 | } |
5101 | |
5102 | if (chan->state != BT_CONNECTED) { |
5103 | /* Ignore logical link if channel is on BR/EDR */ |
5104 | if (chan->local_amp_id != AMP_ID_BREDR) |
5105 | l2cap_logical_finish_create(chan, hchan); |
5106 | } else { |
5107 | l2cap_logical_finish_move(chan, hchan); |
5108 | } |
5109 | } |
5110 | |
5111 | void l2cap_move_start(struct l2cap_chan *chan) |
5112 | { |
5113 | BT_DBG("chan %p" , chan); |
5114 | |
5115 | if (chan->local_amp_id == AMP_ID_BREDR) { |
5116 | if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED) |
5117 | return; |
5118 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; |
5119 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; |
5120 | /* Placeholder - start physical link setup */ |
5121 | } else { |
5122 | chan->move_role = L2CAP_MOVE_ROLE_INITIATOR; |
5123 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; |
5124 | chan->move_id = 0; |
5125 | l2cap_move_setup(chan); |
5126 | l2cap_send_move_chan_req(chan, dest_amp_id: 0); |
5127 | } |
5128 | } |
5129 | |
5130 | static void l2cap_do_create(struct l2cap_chan *chan, int result, |
5131 | u8 local_amp_id, u8 remote_amp_id) |
5132 | { |
5133 | BT_DBG("chan %p state %s %u -> %u" , chan, state_to_string(chan->state), |
5134 | local_amp_id, remote_amp_id); |
5135 | |
5136 | chan->fcs = L2CAP_FCS_NONE; |
5137 | |
5138 | /* Outgoing channel on AMP */ |
5139 | if (chan->state == BT_CONNECT) { |
5140 | if (result == L2CAP_CR_SUCCESS) { |
5141 | chan->local_amp_id = local_amp_id; |
5142 | l2cap_send_create_chan_req(chan, amp_id: remote_amp_id); |
5143 | } else { |
5144 | /* Revert to BR/EDR connect */ |
5145 | l2cap_send_conn_req(chan); |
5146 | } |
5147 | |
5148 | return; |
5149 | } |
5150 | |
5151 | /* Incoming channel on AMP */ |
5152 | if (__l2cap_no_conn_pending(chan)) { |
5153 | struct l2cap_conn_rsp rsp; |
5154 | char buf[128]; |
5155 | rsp.scid = cpu_to_le16(chan->dcid); |
5156 | rsp.dcid = cpu_to_le16(chan->scid); |
5157 | |
5158 | if (result == L2CAP_CR_SUCCESS) { |
5159 | /* Send successful response */ |
5160 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
5161 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
5162 | } else { |
5163 | /* Send negative response */ |
5164 | rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM); |
5165 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
5166 | } |
5167 | |
5168 | l2cap_send_cmd(conn: chan->conn, ident: chan->ident, L2CAP_CREATE_CHAN_RSP, |
5169 | len: sizeof(rsp), data: &rsp); |
5170 | |
5171 | if (result == L2CAP_CR_SUCCESS) { |
5172 | l2cap_state_change(chan, state: BT_CONFIG); |
5173 | set_bit(nr: CONF_REQ_SENT, addr: &chan->conf_state); |
5174 | l2cap_send_cmd(conn: chan->conn, ident: l2cap_get_ident(conn: chan->conn), |
5175 | L2CAP_CONF_REQ, |
5176 | len: l2cap_build_conf_req(chan, data: buf, data_size: sizeof(buf)), data: buf); |
5177 | chan->num_conf_req++; |
5178 | } |
5179 | } |
5180 | } |
5181 | |
5182 | static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id, |
5183 | u8 remote_amp_id) |
5184 | { |
5185 | l2cap_move_setup(chan); |
5186 | chan->move_id = local_amp_id; |
5187 | chan->move_state = L2CAP_MOVE_WAIT_RSP; |
5188 | |
5189 | l2cap_send_move_chan_req(chan, dest_amp_id: remote_amp_id); |
5190 | } |
5191 | |
5192 | static void l2cap_do_move_respond(struct l2cap_chan *chan, int result) |
5193 | { |
5194 | struct hci_chan *hchan = NULL; |
5195 | |
5196 | /* Placeholder - get hci_chan for logical link */ |
5197 | |
5198 | if (hchan) { |
5199 | if (hchan->state == BT_CONNECTED) { |
5200 | /* Logical link is ready to go */ |
5201 | chan->hs_hcon = hchan->conn; |
5202 | chan->hs_hcon->l2cap_data = chan->conn; |
5203 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; |
5204 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS); |
5205 | |
5206 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); |
5207 | } else { |
5208 | /* Wait for logical link to be ready */ |
5209 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; |
5210 | } |
5211 | } else { |
5212 | /* Logical link not available */ |
5213 | l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED); |
5214 | } |
5215 | } |
5216 | |
5217 | static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result) |
5218 | { |
5219 | if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) { |
5220 | u8 rsp_result; |
5221 | if (result == -EINVAL) |
5222 | rsp_result = L2CAP_MR_BAD_ID; |
5223 | else |
5224 | rsp_result = L2CAP_MR_NOT_ALLOWED; |
5225 | |
5226 | l2cap_send_move_chan_rsp(chan, result: rsp_result); |
5227 | } |
5228 | |
5229 | chan->move_role = L2CAP_MOVE_ROLE_NONE; |
5230 | chan->move_state = L2CAP_MOVE_STABLE; |
5231 | |
5232 | /* Restart data transmission */ |
5233 | l2cap_ertm_send(chan); |
5234 | } |
5235 | |
5236 | /* Invoke with locked chan */ |
5237 | void __l2cap_physical_cfm(struct l2cap_chan *chan, int result) |
5238 | { |
5239 | u8 local_amp_id = chan->local_amp_id; |
5240 | u8 remote_amp_id = chan->remote_amp_id; |
5241 | |
5242 | BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d" , |
5243 | chan, result, local_amp_id, remote_amp_id); |
5244 | |
5245 | if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) |
5246 | return; |
5247 | |
5248 | if (chan->state != BT_CONNECTED) { |
5249 | l2cap_do_create(chan, result, local_amp_id, remote_amp_id); |
5250 | } else if (result != L2CAP_MR_SUCCESS) { |
5251 | l2cap_do_move_cancel(chan, result); |
5252 | } else { |
5253 | switch (chan->move_role) { |
5254 | case L2CAP_MOVE_ROLE_INITIATOR: |
5255 | l2cap_do_move_initiate(chan, local_amp_id, |
5256 | remote_amp_id); |
5257 | break; |
5258 | case L2CAP_MOVE_ROLE_RESPONDER: |
5259 | l2cap_do_move_respond(chan, result); |
5260 | break; |
5261 | default: |
5262 | l2cap_do_move_cancel(chan, result); |
5263 | break; |
5264 | } |
5265 | } |
5266 | } |
5267 | |
5268 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, |
5269 | struct l2cap_cmd_hdr *cmd, |
5270 | u16 cmd_len, void *data) |
5271 | { |
5272 | struct l2cap_move_chan_req *req = data; |
5273 | struct l2cap_move_chan_rsp rsp; |
5274 | struct l2cap_chan *chan; |
5275 | u16 icid = 0; |
5276 | u16 result = L2CAP_MR_NOT_ALLOWED; |
5277 | |
5278 | if (cmd_len != sizeof(*req)) |
5279 | return -EPROTO; |
5280 | |
5281 | icid = le16_to_cpu(req->icid); |
5282 | |
5283 | BT_DBG("icid 0x%4.4x, dest_amp_id %d" , icid, req->dest_amp_id); |
5284 | |
5285 | if (!(conn->local_fixed_chan & L2CAP_FC_A2MP)) |
5286 | return -EINVAL; |
5287 | |
5288 | chan = l2cap_get_chan_by_dcid(conn, cid: icid); |
5289 | if (!chan) { |
5290 | rsp.icid = cpu_to_le16(icid); |
5291 | rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED); |
5292 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_MOVE_CHAN_RSP, |
5293 | len: sizeof(rsp), data: &rsp); |
5294 | return 0; |
5295 | } |
5296 | |
5297 | chan->ident = cmd->ident; |
5298 | |
5299 | if (chan->scid < L2CAP_CID_DYN_START || |
5300 | chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY || |
5301 | (chan->mode != L2CAP_MODE_ERTM && |
5302 | chan->mode != L2CAP_MODE_STREAMING)) { |
5303 | result = L2CAP_MR_NOT_ALLOWED; |
5304 | goto send_move_response; |
5305 | } |
5306 | |
5307 | if (chan->local_amp_id == req->dest_amp_id) { |
5308 | result = L2CAP_MR_SAME_ID; |
5309 | goto send_move_response; |
5310 | } |
5311 | |
5312 | if (req->dest_amp_id != AMP_ID_BREDR) { |
5313 | struct hci_dev *hdev; |
5314 | hdev = hci_dev_get(index: req->dest_amp_id); |
5315 | if (!hdev || hdev->dev_type != HCI_AMP || |
5316 | !test_bit(HCI_UP, &hdev->flags)) { |
5317 | if (hdev) |
5318 | hci_dev_put(d: hdev); |
5319 | |
5320 | result = L2CAP_MR_BAD_ID; |
5321 | goto send_move_response; |
5322 | } |
5323 | hci_dev_put(d: hdev); |
5324 | } |
5325 | |
5326 | /* Detect a move collision. Only send a collision response |
5327 | * if this side has "lost", otherwise proceed with the move. |
5328 | * The winner has the larger bd_addr. |
5329 | */ |
5330 | if ((__chan_is_moving(chan) || |
5331 | chan->move_role != L2CAP_MOVE_ROLE_NONE) && |
5332 | bacmp(ba1: &conn->hcon->src, ba2: &conn->hcon->dst) > 0) { |
5333 | result = L2CAP_MR_COLLISION; |
5334 | goto send_move_response; |
5335 | } |
5336 | |
5337 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
5338 | l2cap_move_setup(chan); |
5339 | chan->move_id = req->dest_amp_id; |
5340 | |
5341 | if (req->dest_amp_id == AMP_ID_BREDR) { |
5342 | /* Moving to BR/EDR */ |
5343 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
5344 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; |
5345 | result = L2CAP_MR_PEND; |
5346 | } else { |
5347 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM; |
5348 | result = L2CAP_MR_SUCCESS; |
5349 | } |
5350 | } else { |
5351 | chan->move_state = L2CAP_MOVE_WAIT_PREPARE; |
5352 | /* Placeholder - uncomment when amp functions are available */ |
5353 | /*amp_accept_physical(chan, req->dest_amp_id);*/ |
5354 | result = L2CAP_MR_PEND; |
5355 | } |
5356 | |
5357 | send_move_response: |
5358 | l2cap_send_move_chan_rsp(chan, result); |
5359 | |
5360 | l2cap_chan_unlock(chan); |
5361 | l2cap_chan_put(chan); |
5362 | |
5363 | return 0; |
5364 | } |
5365 | |
5366 | static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result) |
5367 | { |
5368 | struct l2cap_chan *chan; |
5369 | struct hci_chan *hchan = NULL; |
5370 | |
5371 | chan = l2cap_get_chan_by_scid(conn, cid: icid); |
5372 | if (!chan) { |
5373 | l2cap_send_move_chan_cfm_icid(conn, icid); |
5374 | return; |
5375 | } |
5376 | |
5377 | __clear_chan_timer(chan); |
5378 | if (result == L2CAP_MR_PEND) |
5379 | __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT); |
5380 | |
5381 | switch (chan->move_state) { |
5382 | case L2CAP_MOVE_WAIT_LOGICAL_COMP: |
5383 | /* Move confirm will be sent when logical link |
5384 | * is complete. |
5385 | */ |
5386 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; |
5387 | break; |
5388 | case L2CAP_MOVE_WAIT_RSP_SUCCESS: |
5389 | if (result == L2CAP_MR_PEND) { |
5390 | break; |
5391 | } else if (test_bit(CONN_LOCAL_BUSY, |
5392 | &chan->conn_state)) { |
5393 | chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY; |
5394 | } else { |
5395 | /* Logical link is up or moving to BR/EDR, |
5396 | * proceed with move |
5397 | */ |
5398 | chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP; |
5399 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); |
5400 | } |
5401 | break; |
5402 | case L2CAP_MOVE_WAIT_RSP: |
5403 | /* Moving to AMP */ |
5404 | if (result == L2CAP_MR_SUCCESS) { |
5405 | /* Remote is ready, send confirm immediately |
5406 | * after logical link is ready |
5407 | */ |
5408 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM; |
5409 | } else { |
5410 | /* Both logical link and move success |
5411 | * are required to confirm |
5412 | */ |
5413 | chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP; |
5414 | } |
5415 | |
5416 | /* Placeholder - get hci_chan for logical link */ |
5417 | if (!hchan) { |
5418 | /* Logical link not available */ |
5419 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
5420 | break; |
5421 | } |
5422 | |
5423 | /* If the logical link is not yet connected, do not |
5424 | * send confirmation. |
5425 | */ |
5426 | if (hchan->state != BT_CONNECTED) |
5427 | break; |
5428 | |
5429 | /* Logical link is already ready to go */ |
5430 | |
5431 | chan->hs_hcon = hchan->conn; |
5432 | chan->hs_hcon->l2cap_data = chan->conn; |
5433 | |
5434 | if (result == L2CAP_MR_SUCCESS) { |
5435 | /* Can confirm now */ |
5436 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED); |
5437 | } else { |
5438 | /* Now only need move success |
5439 | * to confirm |
5440 | */ |
5441 | chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS; |
5442 | } |
5443 | |
5444 | l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS); |
5445 | break; |
5446 | default: |
5447 | /* Any other amp move state means the move failed. */ |
5448 | chan->move_id = chan->local_amp_id; |
5449 | l2cap_move_done(chan); |
5450 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
5451 | } |
5452 | |
5453 | l2cap_chan_unlock(chan); |
5454 | l2cap_chan_put(chan); |
5455 | } |
5456 | |
5457 | static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid, |
5458 | u16 result) |
5459 | { |
5460 | struct l2cap_chan *chan; |
5461 | |
5462 | chan = l2cap_get_chan_by_ident(conn, ident); |
5463 | if (!chan) { |
5464 | /* Could not locate channel, icid is best guess */ |
5465 | l2cap_send_move_chan_cfm_icid(conn, icid); |
5466 | return; |
5467 | } |
5468 | |
5469 | __clear_chan_timer(chan); |
5470 | |
5471 | if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) { |
5472 | if (result == L2CAP_MR_COLLISION) { |
5473 | chan->move_role = L2CAP_MOVE_ROLE_RESPONDER; |
5474 | } else { |
5475 | /* Cleanup - cancel move */ |
5476 | chan->move_id = chan->local_amp_id; |
5477 | l2cap_move_done(chan); |
5478 | } |
5479 | } |
5480 | |
5481 | l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED); |
5482 | |
5483 | l2cap_chan_unlock(chan); |
5484 | l2cap_chan_put(chan); |
5485 | } |
5486 | |
5487 | static int l2cap_move_channel_rsp(struct l2cap_conn *conn, |
5488 | struct l2cap_cmd_hdr *cmd, |
5489 | u16 cmd_len, void *data) |
5490 | { |
5491 | struct l2cap_move_chan_rsp *rsp = data; |
5492 | u16 icid, result; |
5493 | |
5494 | if (cmd_len != sizeof(*rsp)) |
5495 | return -EPROTO; |
5496 | |
5497 | icid = le16_to_cpu(rsp->icid); |
5498 | result = le16_to_cpu(rsp->result); |
5499 | |
5500 | BT_DBG("icid 0x%4.4x, result 0x%4.4x" , icid, result); |
5501 | |
5502 | if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND) |
5503 | l2cap_move_continue(conn, icid, result); |
5504 | else |
5505 | l2cap_move_fail(conn, ident: cmd->ident, icid, result); |
5506 | |
5507 | return 0; |
5508 | } |
5509 | |
5510 | static int l2cap_move_channel_confirm(struct l2cap_conn *conn, |
5511 | struct l2cap_cmd_hdr *cmd, |
5512 | u16 cmd_len, void *data) |
5513 | { |
5514 | struct l2cap_move_chan_cfm *cfm = data; |
5515 | struct l2cap_chan *chan; |
5516 | u16 icid, result; |
5517 | |
5518 | if (cmd_len != sizeof(*cfm)) |
5519 | return -EPROTO; |
5520 | |
5521 | icid = le16_to_cpu(cfm->icid); |
5522 | result = le16_to_cpu(cfm->result); |
5523 | |
5524 | BT_DBG("icid 0x%4.4x, result 0x%4.4x" , icid, result); |
5525 | |
5526 | chan = l2cap_get_chan_by_dcid(conn, cid: icid); |
5527 | if (!chan) { |
5528 | /* Spec requires a response even if the icid was not found */ |
5529 | l2cap_send_move_chan_cfm_rsp(conn, ident: cmd->ident, icid); |
5530 | return 0; |
5531 | } |
5532 | |
5533 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) { |
5534 | if (result == L2CAP_MC_CONFIRMED) { |
5535 | chan->local_amp_id = chan->move_id; |
5536 | if (chan->local_amp_id == AMP_ID_BREDR) |
5537 | __release_logical_link(chan); |
5538 | } else { |
5539 | chan->move_id = chan->local_amp_id; |
5540 | } |
5541 | |
5542 | l2cap_move_done(chan); |
5543 | } |
5544 | |
5545 | l2cap_send_move_chan_cfm_rsp(conn, ident: cmd->ident, icid); |
5546 | |
5547 | l2cap_chan_unlock(chan); |
5548 | l2cap_chan_put(chan); |
5549 | |
5550 | return 0; |
5551 | } |
5552 | |
5553 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, |
5554 | struct l2cap_cmd_hdr *cmd, |
5555 | u16 cmd_len, void *data) |
5556 | { |
5557 | struct l2cap_move_chan_cfm_rsp *rsp = data; |
5558 | struct l2cap_chan *chan; |
5559 | u16 icid; |
5560 | |
5561 | if (cmd_len != sizeof(*rsp)) |
5562 | return -EPROTO; |
5563 | |
5564 | icid = le16_to_cpu(rsp->icid); |
5565 | |
5566 | BT_DBG("icid 0x%4.4x" , icid); |
5567 | |
5568 | chan = l2cap_get_chan_by_scid(conn, cid: icid); |
5569 | if (!chan) |
5570 | return 0; |
5571 | |
5572 | __clear_chan_timer(chan); |
5573 | |
5574 | if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) { |
5575 | chan->local_amp_id = chan->move_id; |
5576 | |
5577 | if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan) |
5578 | __release_logical_link(chan); |
5579 | |
5580 | l2cap_move_done(chan); |
5581 | } |
5582 | |
5583 | l2cap_chan_unlock(chan); |
5584 | l2cap_chan_put(chan); |
5585 | |
5586 | return 0; |
5587 | } |
5588 | |
5589 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, |
5590 | struct l2cap_cmd_hdr *cmd, |
5591 | u16 cmd_len, u8 *data) |
5592 | { |
5593 | struct hci_conn *hcon = conn->hcon; |
5594 | struct l2cap_conn_param_update_req *req; |
5595 | struct l2cap_conn_param_update_rsp rsp; |
5596 | u16 min, max, latency, to_multiplier; |
5597 | int err; |
5598 | |
5599 | if (hcon->role != HCI_ROLE_MASTER) |
5600 | return -EINVAL; |
5601 | |
5602 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) |
5603 | return -EPROTO; |
5604 | |
5605 | req = (struct l2cap_conn_param_update_req *) data; |
5606 | min = __le16_to_cpu(req->min); |
5607 | max = __le16_to_cpu(req->max); |
5608 | latency = __le16_to_cpu(req->latency); |
5609 | to_multiplier = __le16_to_cpu(req->to_multiplier); |
5610 | |
5611 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x" , |
5612 | min, max, latency, to_multiplier); |
5613 | |
5614 | memset(&rsp, 0, sizeof(rsp)); |
5615 | |
5616 | err = hci_check_conn_params(min, max, latency, to_multiplier); |
5617 | if (err) |
5618 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
5619 | else |
5620 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); |
5621 | |
5622 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, |
5623 | len: sizeof(rsp), data: &rsp); |
5624 | |
5625 | if (!err) { |
5626 | u8 store_hint; |
5627 | |
5628 | store_hint = hci_le_conn_update(conn: hcon, min, max, latency, |
5629 | to_multiplier); |
5630 | mgmt_new_conn_param(hdev: hcon->hdev, bdaddr: &hcon->dst, bdaddr_type: hcon->dst_type, |
5631 | store_hint, min_interval: min, max_interval: max, latency, |
5632 | timeout: to_multiplier); |
5633 | |
5634 | } |
5635 | |
5636 | return 0; |
5637 | } |
5638 | |
5639 | static int l2cap_le_connect_rsp(struct l2cap_conn *conn, |
5640 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5641 | u8 *data) |
5642 | { |
5643 | struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data; |
5644 | struct hci_conn *hcon = conn->hcon; |
5645 | u16 dcid, mtu, mps, credits, result; |
5646 | struct l2cap_chan *chan; |
5647 | int err, sec_level; |
5648 | |
5649 | if (cmd_len < sizeof(*rsp)) |
5650 | return -EPROTO; |
5651 | |
5652 | dcid = __le16_to_cpu(rsp->dcid); |
5653 | mtu = __le16_to_cpu(rsp->mtu); |
5654 | mps = __le16_to_cpu(rsp->mps); |
5655 | credits = __le16_to_cpu(rsp->credits); |
5656 | result = __le16_to_cpu(rsp->result); |
5657 | |
5658 | if (result == L2CAP_CR_LE_SUCCESS && (mtu < 23 || mps < 23 || |
5659 | dcid < L2CAP_CID_DYN_START || |
5660 | dcid > L2CAP_CID_LE_DYN_END)) |
5661 | return -EPROTO; |
5662 | |
5663 | BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x" , |
5664 | dcid, mtu, mps, credits, result); |
5665 | |
5666 | mutex_lock(&conn->chan_lock); |
5667 | |
5668 | chan = __l2cap_get_chan_by_ident(conn, ident: cmd->ident); |
5669 | if (!chan) { |
5670 | err = -EBADSLT; |
5671 | goto unlock; |
5672 | } |
5673 | |
5674 | err = 0; |
5675 | |
5676 | l2cap_chan_lock(chan); |
5677 | |
5678 | switch (result) { |
5679 | case L2CAP_CR_LE_SUCCESS: |
5680 | if (__l2cap_get_chan_by_dcid(conn, cid: dcid)) { |
5681 | err = -EBADSLT; |
5682 | break; |
5683 | } |
5684 | |
5685 | chan->ident = 0; |
5686 | chan->dcid = dcid; |
5687 | chan->omtu = mtu; |
5688 | chan->remote_mps = mps; |
5689 | chan->tx_credits = credits; |
5690 | l2cap_chan_ready(chan); |
5691 | break; |
5692 | |
5693 | case L2CAP_CR_LE_AUTHENTICATION: |
5694 | case L2CAP_CR_LE_ENCRYPTION: |
5695 | /* If we already have MITM protection we can't do |
5696 | * anything. |
5697 | */ |
5698 | if (hcon->sec_level > BT_SECURITY_MEDIUM) { |
5699 | l2cap_chan_del(chan, ECONNREFUSED); |
5700 | break; |
5701 | } |
5702 | |
5703 | sec_level = hcon->sec_level + 1; |
5704 | if (chan->sec_level < sec_level) |
5705 | chan->sec_level = sec_level; |
5706 | |
5707 | /* We'll need to send a new Connect Request */ |
5708 | clear_bit(nr: FLAG_LE_CONN_REQ_SENT, addr: &chan->flags); |
5709 | |
5710 | smp_conn_security(hcon, sec_level: chan->sec_level); |
5711 | break; |
5712 | |
5713 | default: |
5714 | l2cap_chan_del(chan, ECONNREFUSED); |
5715 | break; |
5716 | } |
5717 | |
5718 | l2cap_chan_unlock(chan); |
5719 | |
5720 | unlock: |
5721 | mutex_unlock(lock: &conn->chan_lock); |
5722 | |
5723 | return err; |
5724 | } |
5725 | |
5726 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
5727 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5728 | u8 *data) |
5729 | { |
5730 | int err = 0; |
5731 | |
5732 | switch (cmd->code) { |
5733 | case L2CAP_COMMAND_REJ: |
5734 | l2cap_command_rej(conn, cmd, cmd_len, data); |
5735 | break; |
5736 | |
5737 | case L2CAP_CONN_REQ: |
5738 | err = l2cap_connect_req(conn, cmd, cmd_len, data); |
5739 | break; |
5740 | |
5741 | case L2CAP_CONN_RSP: |
5742 | case L2CAP_CREATE_CHAN_RSP: |
5743 | l2cap_connect_create_rsp(conn, cmd, cmd_len, data); |
5744 | break; |
5745 | |
5746 | case L2CAP_CONF_REQ: |
5747 | err = l2cap_config_req(conn, cmd, cmd_len, data); |
5748 | break; |
5749 | |
5750 | case L2CAP_CONF_RSP: |
5751 | l2cap_config_rsp(conn, cmd, cmd_len, data); |
5752 | break; |
5753 | |
5754 | case L2CAP_DISCONN_REQ: |
5755 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
5756 | break; |
5757 | |
5758 | case L2CAP_DISCONN_RSP: |
5759 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
5760 | break; |
5761 | |
5762 | case L2CAP_ECHO_REQ: |
5763 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_ECHO_RSP, len: cmd_len, data); |
5764 | break; |
5765 | |
5766 | case L2CAP_ECHO_RSP: |
5767 | break; |
5768 | |
5769 | case L2CAP_INFO_REQ: |
5770 | err = l2cap_information_req(conn, cmd, cmd_len, data); |
5771 | break; |
5772 | |
5773 | case L2CAP_INFO_RSP: |
5774 | l2cap_information_rsp(conn, cmd, cmd_len, data); |
5775 | break; |
5776 | |
5777 | case L2CAP_CREATE_CHAN_REQ: |
5778 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); |
5779 | break; |
5780 | |
5781 | case L2CAP_MOVE_CHAN_REQ: |
5782 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); |
5783 | break; |
5784 | |
5785 | case L2CAP_MOVE_CHAN_RSP: |
5786 | l2cap_move_channel_rsp(conn, cmd, cmd_len, data); |
5787 | break; |
5788 | |
5789 | case L2CAP_MOVE_CHAN_CFM: |
5790 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); |
5791 | break; |
5792 | |
5793 | case L2CAP_MOVE_CHAN_CFM_RSP: |
5794 | l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); |
5795 | break; |
5796 | |
5797 | default: |
5798 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x" , cmd->code); |
5799 | err = -EINVAL; |
5800 | break; |
5801 | } |
5802 | |
5803 | return err; |
5804 | } |
5805 | |
5806 | static int l2cap_le_connect_req(struct l2cap_conn *conn, |
5807 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5808 | u8 *data) |
5809 | { |
5810 | struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data; |
5811 | struct l2cap_le_conn_rsp rsp; |
5812 | struct l2cap_chan *chan, *pchan; |
5813 | u16 dcid, scid, credits, mtu, mps; |
5814 | __le16 psm; |
5815 | u8 result; |
5816 | |
5817 | if (cmd_len != sizeof(*req)) |
5818 | return -EPROTO; |
5819 | |
5820 | scid = __le16_to_cpu(req->scid); |
5821 | mtu = __le16_to_cpu(req->mtu); |
5822 | mps = __le16_to_cpu(req->mps); |
5823 | psm = req->psm; |
5824 | dcid = 0; |
5825 | credits = 0; |
5826 | |
5827 | if (mtu < 23 || mps < 23) |
5828 | return -EPROTO; |
5829 | |
5830 | BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u" , __le16_to_cpu(psm), |
5831 | scid, mtu, mps); |
5832 | |
5833 | /* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A |
5834 | * page 1059: |
5835 | * |
5836 | * Valid range: 0x0001-0x00ff |
5837 | * |
5838 | * Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges |
5839 | */ |
5840 | if (!psm || __le16_to_cpu(psm) > L2CAP_PSM_LE_DYN_END) { |
5841 | result = L2CAP_CR_LE_BAD_PSM; |
5842 | chan = NULL; |
5843 | goto response; |
5844 | } |
5845 | |
5846 | /* Check if we have socket listening on psm */ |
5847 | pchan = l2cap_global_chan_by_psm(state: BT_LISTEN, psm, src: &conn->hcon->src, |
5848 | dst: &conn->hcon->dst, LE_LINK); |
5849 | if (!pchan) { |
5850 | result = L2CAP_CR_LE_BAD_PSM; |
5851 | chan = NULL; |
5852 | goto response; |
5853 | } |
5854 | |
5855 | mutex_lock(&conn->chan_lock); |
5856 | l2cap_chan_lock(chan: pchan); |
5857 | |
5858 | if (!smp_sufficient_security(hcon: conn->hcon, sec_level: pchan->sec_level, |
5859 | key_pref: SMP_ALLOW_STK)) { |
5860 | result = L2CAP_CR_LE_AUTHENTICATION; |
5861 | chan = NULL; |
5862 | goto response_unlock; |
5863 | } |
5864 | |
5865 | /* Check for valid dynamic CID range */ |
5866 | if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) { |
5867 | result = L2CAP_CR_LE_INVALID_SCID; |
5868 | chan = NULL; |
5869 | goto response_unlock; |
5870 | } |
5871 | |
5872 | /* Check if we already have channel with that dcid */ |
5873 | if (__l2cap_get_chan_by_dcid(conn, cid: scid)) { |
5874 | result = L2CAP_CR_LE_SCID_IN_USE; |
5875 | chan = NULL; |
5876 | goto response_unlock; |
5877 | } |
5878 | |
5879 | chan = pchan->ops->new_connection(pchan); |
5880 | if (!chan) { |
5881 | result = L2CAP_CR_LE_NO_MEM; |
5882 | goto response_unlock; |
5883 | } |
5884 | |
5885 | bacpy(dst: &chan->src, src: &conn->hcon->src); |
5886 | bacpy(dst: &chan->dst, src: &conn->hcon->dst); |
5887 | chan->src_type = bdaddr_src_type(hcon: conn->hcon); |
5888 | chan->dst_type = bdaddr_dst_type(hcon: conn->hcon); |
5889 | chan->psm = psm; |
5890 | chan->dcid = scid; |
5891 | chan->omtu = mtu; |
5892 | chan->remote_mps = mps; |
5893 | |
5894 | __l2cap_chan_add(conn, chan); |
5895 | |
5896 | l2cap_le_flowctl_init(chan, __le16_to_cpu(req->credits)); |
5897 | |
5898 | dcid = chan->scid; |
5899 | credits = chan->rx_credits; |
5900 | |
5901 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
5902 | |
5903 | chan->ident = cmd->ident; |
5904 | |
5905 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
5906 | l2cap_state_change(chan, state: BT_CONNECT2); |
5907 | /* The following result value is actually not defined |
5908 | * for LE CoC but we use it to let the function know |
5909 | * that it should bail out after doing its cleanup |
5910 | * instead of sending a response. |
5911 | */ |
5912 | result = L2CAP_CR_PEND; |
5913 | chan->ops->defer(chan); |
5914 | } else { |
5915 | l2cap_chan_ready(chan); |
5916 | result = L2CAP_CR_LE_SUCCESS; |
5917 | } |
5918 | |
5919 | response_unlock: |
5920 | l2cap_chan_unlock(chan: pchan); |
5921 | mutex_unlock(lock: &conn->chan_lock); |
5922 | l2cap_chan_put(pchan); |
5923 | |
5924 | if (result == L2CAP_CR_PEND) |
5925 | return 0; |
5926 | |
5927 | response: |
5928 | if (chan) { |
5929 | rsp.mtu = cpu_to_le16(chan->imtu); |
5930 | rsp.mps = cpu_to_le16(chan->mps); |
5931 | } else { |
5932 | rsp.mtu = 0; |
5933 | rsp.mps = 0; |
5934 | } |
5935 | |
5936 | rsp.dcid = cpu_to_le16(dcid); |
5937 | rsp.credits = cpu_to_le16(credits); |
5938 | rsp.result = cpu_to_le16(result); |
5939 | |
5940 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_LE_CONN_RSP, len: sizeof(rsp), data: &rsp); |
5941 | |
5942 | return 0; |
5943 | } |
5944 | |
5945 | static inline int l2cap_le_credits(struct l2cap_conn *conn, |
5946 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5947 | u8 *data) |
5948 | { |
5949 | struct l2cap_le_credits *pkt; |
5950 | struct l2cap_chan *chan; |
5951 | u16 cid, credits, max_credits; |
5952 | |
5953 | if (cmd_len != sizeof(*pkt)) |
5954 | return -EPROTO; |
5955 | |
5956 | pkt = (struct l2cap_le_credits *) data; |
5957 | cid = __le16_to_cpu(pkt->cid); |
5958 | credits = __le16_to_cpu(pkt->credits); |
5959 | |
5960 | BT_DBG("cid 0x%4.4x credits 0x%4.4x" , cid, credits); |
5961 | |
5962 | chan = l2cap_get_chan_by_dcid(conn, cid); |
5963 | if (!chan) |
5964 | return -EBADSLT; |
5965 | |
5966 | max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits; |
5967 | if (credits > max_credits) { |
5968 | BT_ERR("LE credits overflow" ); |
5969 | l2cap_send_disconn_req(chan, ECONNRESET); |
5970 | |
5971 | /* Return 0 so that we don't trigger an unnecessary |
5972 | * command reject packet. |
5973 | */ |
5974 | goto unlock; |
5975 | } |
5976 | |
5977 | chan->tx_credits += credits; |
5978 | |
5979 | /* Resume sending */ |
5980 | l2cap_le_flowctl_send(chan); |
5981 | |
5982 | if (chan->tx_credits) |
5983 | chan->ops->resume(chan); |
5984 | |
5985 | unlock: |
5986 | l2cap_chan_unlock(chan); |
5987 | l2cap_chan_put(chan); |
5988 | |
5989 | return 0; |
5990 | } |
5991 | |
5992 | static inline int l2cap_ecred_conn_req(struct l2cap_conn *conn, |
5993 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
5994 | u8 *data) |
5995 | { |
5996 | struct l2cap_ecred_conn_req *req = (void *) data; |
5997 | struct { |
5998 | struct l2cap_ecred_conn_rsp rsp; |
5999 | __le16 dcid[L2CAP_ECRED_MAX_CID]; |
6000 | } __packed pdu; |
6001 | struct l2cap_chan *chan, *pchan; |
6002 | u16 mtu, mps; |
6003 | __le16 psm; |
6004 | u8 result, len = 0; |
6005 | int i, num_scid; |
6006 | bool defer = false; |
6007 | |
6008 | if (!enable_ecred) |
6009 | return -EINVAL; |
6010 | |
6011 | if (cmd_len < sizeof(*req) || (cmd_len - sizeof(*req)) % sizeof(u16)) { |
6012 | result = L2CAP_CR_LE_INVALID_PARAMS; |
6013 | goto response; |
6014 | } |
6015 | |
6016 | cmd_len -= sizeof(*req); |
6017 | num_scid = cmd_len / sizeof(u16); |
6018 | |
6019 | if (num_scid > ARRAY_SIZE(pdu.dcid)) { |
6020 | result = L2CAP_CR_LE_INVALID_PARAMS; |
6021 | goto response; |
6022 | } |
6023 | |
6024 | mtu = __le16_to_cpu(req->mtu); |
6025 | mps = __le16_to_cpu(req->mps); |
6026 | |
6027 | if (mtu < L2CAP_ECRED_MIN_MTU || mps < L2CAP_ECRED_MIN_MPS) { |
6028 | result = L2CAP_CR_LE_UNACCEPT_PARAMS; |
6029 | goto response; |
6030 | } |
6031 | |
6032 | psm = req->psm; |
6033 | |
6034 | /* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 3, Part A |
6035 | * page 1059: |
6036 | * |
6037 | * Valid range: 0x0001-0x00ff |
6038 | * |
6039 | * Table 4.15: L2CAP_LE_CREDIT_BASED_CONNECTION_REQ SPSM ranges |
6040 | */ |
6041 | if (!psm || __le16_to_cpu(psm) > L2CAP_PSM_LE_DYN_END) { |
6042 | result = L2CAP_CR_LE_BAD_PSM; |
6043 | goto response; |
6044 | } |
6045 | |
6046 | BT_DBG("psm 0x%2.2x mtu %u mps %u" , __le16_to_cpu(psm), mtu, mps); |
6047 | |
6048 | memset(&pdu, 0, sizeof(pdu)); |
6049 | |
6050 | /* Check if we have socket listening on psm */ |
6051 | pchan = l2cap_global_chan_by_psm(state: BT_LISTEN, psm, src: &conn->hcon->src, |
6052 | dst: &conn->hcon->dst, LE_LINK); |
6053 | if (!pchan) { |
6054 | result = L2CAP_CR_LE_BAD_PSM; |
6055 | goto response; |
6056 | } |
6057 | |
6058 | mutex_lock(&conn->chan_lock); |
6059 | l2cap_chan_lock(chan: pchan); |
6060 | |
6061 | if (!smp_sufficient_security(hcon: conn->hcon, sec_level: pchan->sec_level, |
6062 | key_pref: SMP_ALLOW_STK)) { |
6063 | result = L2CAP_CR_LE_AUTHENTICATION; |
6064 | goto unlock; |
6065 | } |
6066 | |
6067 | result = L2CAP_CR_LE_SUCCESS; |
6068 | |
6069 | for (i = 0; i < num_scid; i++) { |
6070 | u16 scid = __le16_to_cpu(req->scid[i]); |
6071 | |
6072 | BT_DBG("scid[%d] 0x%4.4x" , i, scid); |
6073 | |
6074 | pdu.dcid[i] = 0x0000; |
6075 | len += sizeof(*pdu.dcid); |
6076 | |
6077 | /* Check for valid dynamic CID range */ |
6078 | if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) { |
6079 | result = L2CAP_CR_LE_INVALID_SCID; |
6080 | continue; |
6081 | } |
6082 | |
6083 | /* Check if we already have channel with that dcid */ |
6084 | if (__l2cap_get_chan_by_dcid(conn, cid: scid)) { |
6085 | result = L2CAP_CR_LE_SCID_IN_USE; |
6086 | continue; |
6087 | } |
6088 | |
6089 | chan = pchan->ops->new_connection(pchan); |
6090 | if (!chan) { |
6091 | result = L2CAP_CR_LE_NO_MEM; |
6092 | continue; |
6093 | } |
6094 | |
6095 | bacpy(dst: &chan->src, src: &conn->hcon->src); |
6096 | bacpy(dst: &chan->dst, src: &conn->hcon->dst); |
6097 | chan->src_type = bdaddr_src_type(hcon: conn->hcon); |
6098 | chan->dst_type = bdaddr_dst_type(hcon: conn->hcon); |
6099 | chan->psm = psm; |
6100 | chan->dcid = scid; |
6101 | chan->omtu = mtu; |
6102 | chan->remote_mps = mps; |
6103 | |
6104 | __l2cap_chan_add(conn, chan); |
6105 | |
6106 | l2cap_ecred_init(chan, __le16_to_cpu(req->credits)); |
6107 | |
6108 | /* Init response */ |
6109 | if (!pdu.rsp.credits) { |
6110 | pdu.rsp.mtu = cpu_to_le16(chan->imtu); |
6111 | pdu.rsp.mps = cpu_to_le16(chan->mps); |
6112 | pdu.rsp.credits = cpu_to_le16(chan->rx_credits); |
6113 | } |
6114 | |
6115 | pdu.dcid[i] = cpu_to_le16(chan->scid); |
6116 | |
6117 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
6118 | |
6119 | chan->ident = cmd->ident; |
6120 | chan->mode = L2CAP_MODE_EXT_FLOWCTL; |
6121 | |
6122 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
6123 | l2cap_state_change(chan, state: BT_CONNECT2); |
6124 | defer = true; |
6125 | chan->ops->defer(chan); |
6126 | } else { |
6127 | l2cap_chan_ready(chan); |
6128 | } |
6129 | } |
6130 | |
6131 | unlock: |
6132 | l2cap_chan_unlock(chan: pchan); |
6133 | mutex_unlock(lock: &conn->chan_lock); |
6134 | l2cap_chan_put(pchan); |
6135 | |
6136 | response: |
6137 | pdu.rsp.result = cpu_to_le16(result); |
6138 | |
6139 | if (defer) |
6140 | return 0; |
6141 | |
6142 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_ECRED_CONN_RSP, |
6143 | len: sizeof(pdu.rsp) + len, data: &pdu); |
6144 | |
6145 | return 0; |
6146 | } |
6147 | |
6148 | static inline int l2cap_ecred_conn_rsp(struct l2cap_conn *conn, |
6149 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
6150 | u8 *data) |
6151 | { |
6152 | struct l2cap_ecred_conn_rsp *rsp = (void *) data; |
6153 | struct hci_conn *hcon = conn->hcon; |
6154 | u16 mtu, mps, credits, result; |
6155 | struct l2cap_chan *chan, *tmp; |
6156 | int err = 0, sec_level; |
6157 | int i = 0; |
6158 | |
6159 | if (cmd_len < sizeof(*rsp)) |
6160 | return -EPROTO; |
6161 | |
6162 | mtu = __le16_to_cpu(rsp->mtu); |
6163 | mps = __le16_to_cpu(rsp->mps); |
6164 | credits = __le16_to_cpu(rsp->credits); |
6165 | result = __le16_to_cpu(rsp->result); |
6166 | |
6167 | BT_DBG("mtu %u mps %u credits %u result 0x%4.4x" , mtu, mps, credits, |
6168 | result); |
6169 | |
6170 | mutex_lock(&conn->chan_lock); |
6171 | |
6172 | cmd_len -= sizeof(*rsp); |
6173 | |
6174 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6175 | u16 dcid; |
6176 | |
6177 | if (chan->ident != cmd->ident || |
6178 | chan->mode != L2CAP_MODE_EXT_FLOWCTL || |
6179 | chan->state == BT_CONNECTED) |
6180 | continue; |
6181 | |
6182 | l2cap_chan_lock(chan); |
6183 | |
6184 | /* Check that there is a dcid for each pending channel */ |
6185 | if (cmd_len < sizeof(dcid)) { |
6186 | l2cap_chan_del(chan, ECONNREFUSED); |
6187 | l2cap_chan_unlock(chan); |
6188 | continue; |
6189 | } |
6190 | |
6191 | dcid = __le16_to_cpu(rsp->dcid[i++]); |
6192 | cmd_len -= sizeof(u16); |
6193 | |
6194 | BT_DBG("dcid[%d] 0x%4.4x" , i, dcid); |
6195 | |
6196 | /* Check if dcid is already in use */ |
6197 | if (dcid && __l2cap_get_chan_by_dcid(conn, cid: dcid)) { |
6198 | /* If a device receives a |
6199 | * L2CAP_CREDIT_BASED_CONNECTION_RSP packet with an |
6200 | * already-assigned Destination CID, then both the |
6201 | * original channel and the new channel shall be |
6202 | * immediately discarded and not used. |
6203 | */ |
6204 | l2cap_chan_del(chan, ECONNREFUSED); |
6205 | l2cap_chan_unlock(chan); |
6206 | chan = __l2cap_get_chan_by_dcid(conn, cid: dcid); |
6207 | l2cap_chan_lock(chan); |
6208 | l2cap_chan_del(chan, ECONNRESET); |
6209 | l2cap_chan_unlock(chan); |
6210 | continue; |
6211 | } |
6212 | |
6213 | switch (result) { |
6214 | case L2CAP_CR_LE_AUTHENTICATION: |
6215 | case L2CAP_CR_LE_ENCRYPTION: |
6216 | /* If we already have MITM protection we can't do |
6217 | * anything. |
6218 | */ |
6219 | if (hcon->sec_level > BT_SECURITY_MEDIUM) { |
6220 | l2cap_chan_del(chan, ECONNREFUSED); |
6221 | break; |
6222 | } |
6223 | |
6224 | sec_level = hcon->sec_level + 1; |
6225 | if (chan->sec_level < sec_level) |
6226 | chan->sec_level = sec_level; |
6227 | |
6228 | /* We'll need to send a new Connect Request */ |
6229 | clear_bit(nr: FLAG_ECRED_CONN_REQ_SENT, addr: &chan->flags); |
6230 | |
6231 | smp_conn_security(hcon, sec_level: chan->sec_level); |
6232 | break; |
6233 | |
6234 | case L2CAP_CR_LE_BAD_PSM: |
6235 | l2cap_chan_del(chan, ECONNREFUSED); |
6236 | break; |
6237 | |
6238 | default: |
6239 | /* If dcid was not set it means channels was refused */ |
6240 | if (!dcid) { |
6241 | l2cap_chan_del(chan, ECONNREFUSED); |
6242 | break; |
6243 | } |
6244 | |
6245 | chan->ident = 0; |
6246 | chan->dcid = dcid; |
6247 | chan->omtu = mtu; |
6248 | chan->remote_mps = mps; |
6249 | chan->tx_credits = credits; |
6250 | l2cap_chan_ready(chan); |
6251 | break; |
6252 | } |
6253 | |
6254 | l2cap_chan_unlock(chan); |
6255 | } |
6256 | |
6257 | mutex_unlock(lock: &conn->chan_lock); |
6258 | |
6259 | return err; |
6260 | } |
6261 | |
6262 | static inline int l2cap_ecred_reconf_req(struct l2cap_conn *conn, |
6263 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
6264 | u8 *data) |
6265 | { |
6266 | struct l2cap_ecred_reconf_req *req = (void *) data; |
6267 | struct l2cap_ecred_reconf_rsp rsp; |
6268 | u16 mtu, mps, result; |
6269 | struct l2cap_chan *chan; |
6270 | int i, num_scid; |
6271 | |
6272 | if (!enable_ecred) |
6273 | return -EINVAL; |
6274 | |
6275 | if (cmd_len < sizeof(*req) || cmd_len - sizeof(*req) % sizeof(u16)) { |
6276 | result = L2CAP_CR_LE_INVALID_PARAMS; |
6277 | goto respond; |
6278 | } |
6279 | |
6280 | mtu = __le16_to_cpu(req->mtu); |
6281 | mps = __le16_to_cpu(req->mps); |
6282 | |
6283 | BT_DBG("mtu %u mps %u" , mtu, mps); |
6284 | |
6285 | if (mtu < L2CAP_ECRED_MIN_MTU) { |
6286 | result = L2CAP_RECONF_INVALID_MTU; |
6287 | goto respond; |
6288 | } |
6289 | |
6290 | if (mps < L2CAP_ECRED_MIN_MPS) { |
6291 | result = L2CAP_RECONF_INVALID_MPS; |
6292 | goto respond; |
6293 | } |
6294 | |
6295 | cmd_len -= sizeof(*req); |
6296 | num_scid = cmd_len / sizeof(u16); |
6297 | result = L2CAP_RECONF_SUCCESS; |
6298 | |
6299 | for (i = 0; i < num_scid; i++) { |
6300 | u16 scid; |
6301 | |
6302 | scid = __le16_to_cpu(req->scid[i]); |
6303 | if (!scid) |
6304 | return -EPROTO; |
6305 | |
6306 | chan = __l2cap_get_chan_by_dcid(conn, cid: scid); |
6307 | if (!chan) |
6308 | continue; |
6309 | |
6310 | /* If the MTU value is decreased for any of the included |
6311 | * channels, then the receiver shall disconnect all |
6312 | * included channels. |
6313 | */ |
6314 | if (chan->omtu > mtu) { |
6315 | BT_ERR("chan %p decreased MTU %u -> %u" , chan, |
6316 | chan->omtu, mtu); |
6317 | result = L2CAP_RECONF_INVALID_MTU; |
6318 | } |
6319 | |
6320 | chan->omtu = mtu; |
6321 | chan->remote_mps = mps; |
6322 | } |
6323 | |
6324 | respond: |
6325 | rsp.result = cpu_to_le16(result); |
6326 | |
6327 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_ECRED_RECONF_RSP, len: sizeof(rsp), |
6328 | data: &rsp); |
6329 | |
6330 | return 0; |
6331 | } |
6332 | |
6333 | static inline int l2cap_ecred_reconf_rsp(struct l2cap_conn *conn, |
6334 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
6335 | u8 *data) |
6336 | { |
6337 | struct l2cap_chan *chan, *tmp; |
6338 | struct l2cap_ecred_conn_rsp *rsp = (void *) data; |
6339 | u16 result; |
6340 | |
6341 | if (cmd_len < sizeof(*rsp)) |
6342 | return -EPROTO; |
6343 | |
6344 | result = __le16_to_cpu(rsp->result); |
6345 | |
6346 | BT_DBG("result 0x%4.4x" , rsp->result); |
6347 | |
6348 | if (!result) |
6349 | return 0; |
6350 | |
6351 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
6352 | if (chan->ident != cmd->ident) |
6353 | continue; |
6354 | |
6355 | l2cap_chan_del(chan, ECONNRESET); |
6356 | } |
6357 | |
6358 | return 0; |
6359 | } |
6360 | |
6361 | static inline int l2cap_le_command_rej(struct l2cap_conn *conn, |
6362 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
6363 | u8 *data) |
6364 | { |
6365 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
6366 | struct l2cap_chan *chan; |
6367 | |
6368 | if (cmd_len < sizeof(*rej)) |
6369 | return -EPROTO; |
6370 | |
6371 | mutex_lock(&conn->chan_lock); |
6372 | |
6373 | chan = __l2cap_get_chan_by_ident(conn, ident: cmd->ident); |
6374 | if (!chan) |
6375 | goto done; |
6376 | |
6377 | chan = l2cap_chan_hold_unless_zero(c: chan); |
6378 | if (!chan) |
6379 | goto done; |
6380 | |
6381 | l2cap_chan_lock(chan); |
6382 | l2cap_chan_del(chan, ECONNREFUSED); |
6383 | l2cap_chan_unlock(chan); |
6384 | l2cap_chan_put(chan); |
6385 | |
6386 | done: |
6387 | mutex_unlock(lock: &conn->chan_lock); |
6388 | return 0; |
6389 | } |
6390 | |
6391 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, |
6392 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, |
6393 | u8 *data) |
6394 | { |
6395 | int err = 0; |
6396 | |
6397 | switch (cmd->code) { |
6398 | case L2CAP_COMMAND_REJ: |
6399 | l2cap_le_command_rej(conn, cmd, cmd_len, data); |
6400 | break; |
6401 | |
6402 | case L2CAP_CONN_PARAM_UPDATE_REQ: |
6403 | err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data); |
6404 | break; |
6405 | |
6406 | case L2CAP_CONN_PARAM_UPDATE_RSP: |
6407 | break; |
6408 | |
6409 | case L2CAP_LE_CONN_RSP: |
6410 | l2cap_le_connect_rsp(conn, cmd, cmd_len, data); |
6411 | break; |
6412 | |
6413 | case L2CAP_LE_CONN_REQ: |
6414 | err = l2cap_le_connect_req(conn, cmd, cmd_len, data); |
6415 | break; |
6416 | |
6417 | case L2CAP_LE_CREDITS: |
6418 | err = l2cap_le_credits(conn, cmd, cmd_len, data); |
6419 | break; |
6420 | |
6421 | case L2CAP_ECRED_CONN_REQ: |
6422 | err = l2cap_ecred_conn_req(conn, cmd, cmd_len, data); |
6423 | break; |
6424 | |
6425 | case L2CAP_ECRED_CONN_RSP: |
6426 | err = l2cap_ecred_conn_rsp(conn, cmd, cmd_len, data); |
6427 | break; |
6428 | |
6429 | case L2CAP_ECRED_RECONF_REQ: |
6430 | err = l2cap_ecred_reconf_req(conn, cmd, cmd_len, data); |
6431 | break; |
6432 | |
6433 | case L2CAP_ECRED_RECONF_RSP: |
6434 | err = l2cap_ecred_reconf_rsp(conn, cmd, cmd_len, data); |
6435 | break; |
6436 | |
6437 | case L2CAP_DISCONN_REQ: |
6438 | err = l2cap_disconnect_req(conn, cmd, cmd_len, data); |
6439 | break; |
6440 | |
6441 | case L2CAP_DISCONN_RSP: |
6442 | l2cap_disconnect_rsp(conn, cmd, cmd_len, data); |
6443 | break; |
6444 | |
6445 | default: |
6446 | BT_ERR("Unknown LE signaling command 0x%2.2x" , cmd->code); |
6447 | err = -EINVAL; |
6448 | break; |
6449 | } |
6450 | |
6451 | return err; |
6452 | } |
6453 | |
6454 | static inline void l2cap_le_sig_channel(struct l2cap_conn *conn, |
6455 | struct sk_buff *skb) |
6456 | { |
6457 | struct hci_conn *hcon = conn->hcon; |
6458 | struct l2cap_cmd_hdr *cmd; |
6459 | u16 len; |
6460 | int err; |
6461 | |
6462 | if (hcon->type != LE_LINK) |
6463 | goto drop; |
6464 | |
6465 | if (skb->len < L2CAP_CMD_HDR_SIZE) |
6466 | goto drop; |
6467 | |
6468 | cmd = (void *) skb->data; |
6469 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); |
6470 | |
6471 | len = le16_to_cpu(cmd->len); |
6472 | |
6473 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x" , cmd->code, len, cmd->ident); |
6474 | |
6475 | if (len != skb->len || !cmd->ident) { |
6476 | BT_DBG("corrupted command" ); |
6477 | goto drop; |
6478 | } |
6479 | |
6480 | err = l2cap_le_sig_cmd(conn, cmd, cmd_len: len, data: skb->data); |
6481 | if (err) { |
6482 | struct l2cap_cmd_rej_unk rej; |
6483 | |
6484 | BT_ERR("Wrong link type (%d)" , err); |
6485 | |
6486 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
6487 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_COMMAND_REJ, |
6488 | len: sizeof(rej), data: &rej); |
6489 | } |
6490 | |
6491 | drop: |
6492 | kfree_skb(skb); |
6493 | } |
6494 | |
6495 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, |
6496 | struct sk_buff *skb) |
6497 | { |
6498 | struct hci_conn *hcon = conn->hcon; |
6499 | struct l2cap_cmd_hdr *cmd; |
6500 | int err; |
6501 | |
6502 | l2cap_raw_recv(conn, skb); |
6503 | |
6504 | if (hcon->type != ACL_LINK) |
6505 | goto drop; |
6506 | |
6507 | while (skb->len >= L2CAP_CMD_HDR_SIZE) { |
6508 | u16 len; |
6509 | |
6510 | cmd = (void *) skb->data; |
6511 | skb_pull(skb, L2CAP_CMD_HDR_SIZE); |
6512 | |
6513 | len = le16_to_cpu(cmd->len); |
6514 | |
6515 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x" , cmd->code, len, |
6516 | cmd->ident); |
6517 | |
6518 | if (len > skb->len || !cmd->ident) { |
6519 | BT_DBG("corrupted command" ); |
6520 | break; |
6521 | } |
6522 | |
6523 | err = l2cap_bredr_sig_cmd(conn, cmd, cmd_len: len, data: skb->data); |
6524 | if (err) { |
6525 | struct l2cap_cmd_rej_unk rej; |
6526 | |
6527 | BT_ERR("Wrong link type (%d)" , err); |
6528 | |
6529 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
6530 | l2cap_send_cmd(conn, ident: cmd->ident, L2CAP_COMMAND_REJ, |
6531 | len: sizeof(rej), data: &rej); |
6532 | } |
6533 | |
6534 | skb_pull(skb, len); |
6535 | } |
6536 | |
6537 | drop: |
6538 | kfree_skb(skb); |
6539 | } |
6540 | |
6541 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
6542 | { |
6543 | u16 our_fcs, rcv_fcs; |
6544 | int hdr_size; |
6545 | |
6546 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
6547 | hdr_size = L2CAP_EXT_HDR_SIZE; |
6548 | else |
6549 | hdr_size = L2CAP_ENH_HDR_SIZE; |
6550 | |
6551 | if (chan->fcs == L2CAP_FCS_CRC16) { |
6552 | skb_trim(skb, len: skb->len - L2CAP_FCS_SIZE); |
6553 | rcv_fcs = get_unaligned_le16(p: skb->data + skb->len); |
6554 | our_fcs = crc16(crc: 0, buffer: skb->data - hdr_size, len: skb->len + hdr_size); |
6555 | |
6556 | if (our_fcs != rcv_fcs) |
6557 | return -EBADMSG; |
6558 | } |
6559 | return 0; |
6560 | } |
6561 | |
6562 | static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
6563 | { |
6564 | struct l2cap_ctrl control; |
6565 | |
6566 | BT_DBG("chan %p" , chan); |
6567 | |
6568 | memset(&control, 0, sizeof(control)); |
6569 | control.sframe = 1; |
6570 | control.final = 1; |
6571 | control.reqseq = chan->buffer_seq; |
6572 | set_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state); |
6573 | |
6574 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
6575 | control.super = L2CAP_SUPER_RNR; |
6576 | l2cap_send_sframe(chan, control: &control); |
6577 | } |
6578 | |
6579 | if (test_and_clear_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state) && |
6580 | chan->unacked_frames > 0) |
6581 | __set_retrans_timer(chan); |
6582 | |
6583 | /* Send pending iframes */ |
6584 | l2cap_ertm_send(chan); |
6585 | |
6586 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6587 | test_bit(CONN_SEND_FBIT, &chan->conn_state)) { |
6588 | /* F-bit wasn't sent in an s-frame or i-frame yet, so |
6589 | * send it now. |
6590 | */ |
6591 | control.super = L2CAP_SUPER_RR; |
6592 | l2cap_send_sframe(chan, control: &control); |
6593 | } |
6594 | } |
6595 | |
6596 | static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag, |
6597 | struct sk_buff **last_frag) |
6598 | { |
6599 | /* skb->len reflects data in skb as well as all fragments |
6600 | * skb->data_len reflects only data in fragments |
6601 | */ |
6602 | if (!skb_has_frag_list(skb)) |
6603 | skb_shinfo(skb)->frag_list = new_frag; |
6604 | |
6605 | new_frag->next = NULL; |
6606 | |
6607 | (*last_frag)->next = new_frag; |
6608 | *last_frag = new_frag; |
6609 | |
6610 | skb->len += new_frag->len; |
6611 | skb->data_len += new_frag->len; |
6612 | skb->truesize += new_frag->truesize; |
6613 | } |
6614 | |
6615 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, |
6616 | struct l2cap_ctrl *control) |
6617 | { |
6618 | int err = -EINVAL; |
6619 | |
6620 | switch (control->sar) { |
6621 | case L2CAP_SAR_UNSEGMENTED: |
6622 | if (chan->sdu) |
6623 | break; |
6624 | |
6625 | err = chan->ops->recv(chan, skb); |
6626 | break; |
6627 | |
6628 | case L2CAP_SAR_START: |
6629 | if (chan->sdu) |
6630 | break; |
6631 | |
6632 | if (!pskb_may_pull(skb, L2CAP_SDULEN_SIZE)) |
6633 | break; |
6634 | |
6635 | chan->sdu_len = get_unaligned_le16(p: skb->data); |
6636 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
6637 | |
6638 | if (chan->sdu_len > chan->imtu) { |
6639 | err = -EMSGSIZE; |
6640 | break; |
6641 | } |
6642 | |
6643 | if (skb->len >= chan->sdu_len) |
6644 | break; |
6645 | |
6646 | chan->sdu = skb; |
6647 | chan->sdu_last_frag = skb; |
6648 | |
6649 | skb = NULL; |
6650 | err = 0; |
6651 | break; |
6652 | |
6653 | case L2CAP_SAR_CONTINUE: |
6654 | if (!chan->sdu) |
6655 | break; |
6656 | |
6657 | append_skb_frag(skb: chan->sdu, new_frag: skb, |
6658 | last_frag: &chan->sdu_last_frag); |
6659 | skb = NULL; |
6660 | |
6661 | if (chan->sdu->len >= chan->sdu_len) |
6662 | break; |
6663 | |
6664 | err = 0; |
6665 | break; |
6666 | |
6667 | case L2CAP_SAR_END: |
6668 | if (!chan->sdu) |
6669 | break; |
6670 | |
6671 | append_skb_frag(skb: chan->sdu, new_frag: skb, |
6672 | last_frag: &chan->sdu_last_frag); |
6673 | skb = NULL; |
6674 | |
6675 | if (chan->sdu->len != chan->sdu_len) |
6676 | break; |
6677 | |
6678 | err = chan->ops->recv(chan, chan->sdu); |
6679 | |
6680 | if (!err) { |
6681 | /* Reassembly complete */ |
6682 | chan->sdu = NULL; |
6683 | chan->sdu_last_frag = NULL; |
6684 | chan->sdu_len = 0; |
6685 | } |
6686 | break; |
6687 | } |
6688 | |
6689 | if (err) { |
6690 | kfree_skb(skb); |
6691 | kfree_skb(skb: chan->sdu); |
6692 | chan->sdu = NULL; |
6693 | chan->sdu_last_frag = NULL; |
6694 | chan->sdu_len = 0; |
6695 | } |
6696 | |
6697 | return err; |
6698 | } |
6699 | |
6700 | static int l2cap_resegment(struct l2cap_chan *chan) |
6701 | { |
6702 | /* Placeholder */ |
6703 | return 0; |
6704 | } |
6705 | |
6706 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
6707 | { |
6708 | u8 event; |
6709 | |
6710 | if (chan->mode != L2CAP_MODE_ERTM) |
6711 | return; |
6712 | |
6713 | event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR; |
6714 | l2cap_tx(chan, NULL, NULL, event); |
6715 | } |
6716 | |
6717 | static int l2cap_rx_queued_iframes(struct l2cap_chan *chan) |
6718 | { |
6719 | int err = 0; |
6720 | /* Pass sequential frames to l2cap_reassemble_sdu() |
6721 | * until a gap is encountered. |
6722 | */ |
6723 | |
6724 | BT_DBG("chan %p" , chan); |
6725 | |
6726 | while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
6727 | struct sk_buff *skb; |
6728 | BT_DBG("Searching for skb with txseq %d (queue len %d)" , |
6729 | chan->buffer_seq, skb_queue_len(&chan->srej_q)); |
6730 | |
6731 | skb = l2cap_ertm_seq_in_queue(head: &chan->srej_q, seq: chan->buffer_seq); |
6732 | |
6733 | if (!skb) |
6734 | break; |
6735 | |
6736 | skb_unlink(skb, list: &chan->srej_q); |
6737 | chan->buffer_seq = __next_seq(chan, seq: chan->buffer_seq); |
6738 | err = l2cap_reassemble_sdu(chan, skb, control: &bt_cb(skb)->l2cap); |
6739 | if (err) |
6740 | break; |
6741 | } |
6742 | |
6743 | if (skb_queue_empty(list: &chan->srej_q)) { |
6744 | chan->rx_state = L2CAP_RX_STATE_RECV; |
6745 | l2cap_send_ack(chan); |
6746 | } |
6747 | |
6748 | return err; |
6749 | } |
6750 | |
6751 | static void l2cap_handle_srej(struct l2cap_chan *chan, |
6752 | struct l2cap_ctrl *control) |
6753 | { |
6754 | struct sk_buff *skb; |
6755 | |
6756 | BT_DBG("chan %p, control %p" , chan, control); |
6757 | |
6758 | if (control->reqseq == chan->next_tx_seq) { |
6759 | BT_DBG("Invalid reqseq %d, disconnecting" , control->reqseq); |
6760 | l2cap_send_disconn_req(chan, ECONNRESET); |
6761 | return; |
6762 | } |
6763 | |
6764 | skb = l2cap_ertm_seq_in_queue(head: &chan->tx_q, seq: control->reqseq); |
6765 | |
6766 | if (skb == NULL) { |
6767 | BT_DBG("Seq %d not available for retransmission" , |
6768 | control->reqseq); |
6769 | return; |
6770 | } |
6771 | |
6772 | if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) { |
6773 | BT_DBG("Retry limit exceeded (%d)" , chan->max_tx); |
6774 | l2cap_send_disconn_req(chan, ECONNRESET); |
6775 | return; |
6776 | } |
6777 | |
6778 | clear_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
6779 | |
6780 | if (control->poll) { |
6781 | l2cap_pass_to_tx(chan, control); |
6782 | |
6783 | set_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state); |
6784 | l2cap_retransmit(chan, control); |
6785 | l2cap_ertm_send(chan); |
6786 | |
6787 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { |
6788 | set_bit(nr: CONN_SREJ_ACT, addr: &chan->conn_state); |
6789 | chan->srej_save_reqseq = control->reqseq; |
6790 | } |
6791 | } else { |
6792 | l2cap_pass_to_tx_fbit(chan, control); |
6793 | |
6794 | if (control->final) { |
6795 | if (chan->srej_save_reqseq != control->reqseq || |
6796 | !test_and_clear_bit(nr: CONN_SREJ_ACT, |
6797 | addr: &chan->conn_state)) |
6798 | l2cap_retransmit(chan, control); |
6799 | } else { |
6800 | l2cap_retransmit(chan, control); |
6801 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) { |
6802 | set_bit(nr: CONN_SREJ_ACT, addr: &chan->conn_state); |
6803 | chan->srej_save_reqseq = control->reqseq; |
6804 | } |
6805 | } |
6806 | } |
6807 | } |
6808 | |
6809 | static void l2cap_handle_rej(struct l2cap_chan *chan, |
6810 | struct l2cap_ctrl *control) |
6811 | { |
6812 | struct sk_buff *skb; |
6813 | |
6814 | BT_DBG("chan %p, control %p" , chan, control); |
6815 | |
6816 | if (control->reqseq == chan->next_tx_seq) { |
6817 | BT_DBG("Invalid reqseq %d, disconnecting" , control->reqseq); |
6818 | l2cap_send_disconn_req(chan, ECONNRESET); |
6819 | return; |
6820 | } |
6821 | |
6822 | skb = l2cap_ertm_seq_in_queue(head: &chan->tx_q, seq: control->reqseq); |
6823 | |
6824 | if (chan->max_tx && skb && |
6825 | bt_cb(skb)->l2cap.retries >= chan->max_tx) { |
6826 | BT_DBG("Retry limit exceeded (%d)" , chan->max_tx); |
6827 | l2cap_send_disconn_req(chan, ECONNRESET); |
6828 | return; |
6829 | } |
6830 | |
6831 | clear_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
6832 | |
6833 | l2cap_pass_to_tx(chan, control); |
6834 | |
6835 | if (control->final) { |
6836 | if (!test_and_clear_bit(nr: CONN_REJ_ACT, addr: &chan->conn_state)) |
6837 | l2cap_retransmit_all(chan, control); |
6838 | } else { |
6839 | l2cap_retransmit_all(chan, control); |
6840 | l2cap_ertm_send(chan); |
6841 | if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) |
6842 | set_bit(nr: CONN_REJ_ACT, addr: &chan->conn_state); |
6843 | } |
6844 | } |
6845 | |
6846 | static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq) |
6847 | { |
6848 | BT_DBG("chan %p, txseq %d" , chan, txseq); |
6849 | |
6850 | BT_DBG("last_acked_seq %d, expected_tx_seq %d" , chan->last_acked_seq, |
6851 | chan->expected_tx_seq); |
6852 | |
6853 | if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) { |
6854 | if (__seq_offset(chan, seq1: txseq, seq2: chan->last_acked_seq) >= |
6855 | chan->tx_win) { |
6856 | /* See notes below regarding "double poll" and |
6857 | * invalid packets. |
6858 | */ |
6859 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { |
6860 | BT_DBG("Invalid/Ignore - after SREJ" ); |
6861 | return L2CAP_TXSEQ_INVALID_IGNORE; |
6862 | } else { |
6863 | BT_DBG("Invalid - in window after SREJ sent" ); |
6864 | return L2CAP_TXSEQ_INVALID; |
6865 | } |
6866 | } |
6867 | |
6868 | if (chan->srej_list.head == txseq) { |
6869 | BT_DBG("Expected SREJ" ); |
6870 | return L2CAP_TXSEQ_EXPECTED_SREJ; |
6871 | } |
6872 | |
6873 | if (l2cap_ertm_seq_in_queue(head: &chan->srej_q, seq: txseq)) { |
6874 | BT_DBG("Duplicate SREJ - txseq already stored" ); |
6875 | return L2CAP_TXSEQ_DUPLICATE_SREJ; |
6876 | } |
6877 | |
6878 | if (l2cap_seq_list_contains(seq_list: &chan->srej_list, seq: txseq)) { |
6879 | BT_DBG("Unexpected SREJ - not requested" ); |
6880 | return L2CAP_TXSEQ_UNEXPECTED_SREJ; |
6881 | } |
6882 | } |
6883 | |
6884 | if (chan->expected_tx_seq == txseq) { |
6885 | if (__seq_offset(chan, seq1: txseq, seq2: chan->last_acked_seq) >= |
6886 | chan->tx_win) { |
6887 | BT_DBG("Invalid - txseq outside tx window" ); |
6888 | return L2CAP_TXSEQ_INVALID; |
6889 | } else { |
6890 | BT_DBG("Expected" ); |
6891 | return L2CAP_TXSEQ_EXPECTED; |
6892 | } |
6893 | } |
6894 | |
6895 | if (__seq_offset(chan, seq1: txseq, seq2: chan->last_acked_seq) < |
6896 | __seq_offset(chan, seq1: chan->expected_tx_seq, seq2: chan->last_acked_seq)) { |
6897 | BT_DBG("Duplicate - expected_tx_seq later than txseq" ); |
6898 | return L2CAP_TXSEQ_DUPLICATE; |
6899 | } |
6900 | |
6901 | if (__seq_offset(chan, seq1: txseq, seq2: chan->last_acked_seq) >= chan->tx_win) { |
6902 | /* A source of invalid packets is a "double poll" condition, |
6903 | * where delays cause us to send multiple poll packets. If |
6904 | * the remote stack receives and processes both polls, |
6905 | * sequence numbers can wrap around in such a way that a |
6906 | * resent frame has a sequence number that looks like new data |
6907 | * with a sequence gap. This would trigger an erroneous SREJ |
6908 | * request. |
6909 | * |
6910 | * Fortunately, this is impossible with a tx window that's |
6911 | * less than half of the maximum sequence number, which allows |
6912 | * invalid frames to be safely ignored. |
6913 | * |
6914 | * With tx window sizes greater than half of the tx window |
6915 | * maximum, the frame is invalid and cannot be ignored. This |
6916 | * causes a disconnect. |
6917 | */ |
6918 | |
6919 | if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) { |
6920 | BT_DBG("Invalid/Ignore - txseq outside tx window" ); |
6921 | return L2CAP_TXSEQ_INVALID_IGNORE; |
6922 | } else { |
6923 | BT_DBG("Invalid - txseq outside tx window" ); |
6924 | return L2CAP_TXSEQ_INVALID; |
6925 | } |
6926 | } else { |
6927 | BT_DBG("Unexpected - txseq indicates missing frames" ); |
6928 | return L2CAP_TXSEQ_UNEXPECTED; |
6929 | } |
6930 | } |
6931 | |
6932 | static int l2cap_rx_state_recv(struct l2cap_chan *chan, |
6933 | struct l2cap_ctrl *control, |
6934 | struct sk_buff *skb, u8 event) |
6935 | { |
6936 | struct l2cap_ctrl local_control; |
6937 | int err = 0; |
6938 | bool skb_in_use = false; |
6939 | |
6940 | BT_DBG("chan %p, control %p, skb %p, event %d" , chan, control, skb, |
6941 | event); |
6942 | |
6943 | switch (event) { |
6944 | case L2CAP_EV_RECV_IFRAME: |
6945 | switch (l2cap_classify_txseq(chan, txseq: control->txseq)) { |
6946 | case L2CAP_TXSEQ_EXPECTED: |
6947 | l2cap_pass_to_tx(chan, control); |
6948 | |
6949 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
6950 | BT_DBG("Busy, discarding expected seq %d" , |
6951 | control->txseq); |
6952 | break; |
6953 | } |
6954 | |
6955 | chan->expected_tx_seq = __next_seq(chan, |
6956 | seq: control->txseq); |
6957 | |
6958 | chan->buffer_seq = chan->expected_tx_seq; |
6959 | skb_in_use = true; |
6960 | |
6961 | /* l2cap_reassemble_sdu may free skb, hence invalidate |
6962 | * control, so make a copy in advance to use it after |
6963 | * l2cap_reassemble_sdu returns and to avoid the race |
6964 | * condition, for example: |
6965 | * |
6966 | * The current thread calls: |
6967 | * l2cap_reassemble_sdu |
6968 | * chan->ops->recv == l2cap_sock_recv_cb |
6969 | * __sock_queue_rcv_skb |
6970 | * Another thread calls: |
6971 | * bt_sock_recvmsg |
6972 | * skb_recv_datagram |
6973 | * skb_free_datagram |
6974 | * Then the current thread tries to access control, but |
6975 | * it was freed by skb_free_datagram. |
6976 | */ |
6977 | local_control = *control; |
6978 | err = l2cap_reassemble_sdu(chan, skb, control); |
6979 | if (err) |
6980 | break; |
6981 | |
6982 | if (local_control.final) { |
6983 | if (!test_and_clear_bit(nr: CONN_REJ_ACT, |
6984 | addr: &chan->conn_state)) { |
6985 | local_control.final = 0; |
6986 | l2cap_retransmit_all(chan, control: &local_control); |
6987 | l2cap_ertm_send(chan); |
6988 | } |
6989 | } |
6990 | |
6991 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) |
6992 | l2cap_send_ack(chan); |
6993 | break; |
6994 | case L2CAP_TXSEQ_UNEXPECTED: |
6995 | l2cap_pass_to_tx(chan, control); |
6996 | |
6997 | /* Can't issue SREJ frames in the local busy state. |
6998 | * Drop this frame, it will be seen as missing |
6999 | * when local busy is exited. |
7000 | */ |
7001 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
7002 | BT_DBG("Busy, discarding unexpected seq %d" , |
7003 | control->txseq); |
7004 | break; |
7005 | } |
7006 | |
7007 | /* There was a gap in the sequence, so an SREJ |
7008 | * must be sent for each missing frame. The |
7009 | * current frame is stored for later use. |
7010 | */ |
7011 | skb_queue_tail(list: &chan->srej_q, newsk: skb); |
7012 | skb_in_use = true; |
7013 | BT_DBG("Queued %p (queue len %d)" , skb, |
7014 | skb_queue_len(&chan->srej_q)); |
7015 | |
7016 | clear_bit(nr: CONN_SREJ_ACT, addr: &chan->conn_state); |
7017 | l2cap_seq_list_clear(seq_list: &chan->srej_list); |
7018 | l2cap_send_srej(chan, txseq: control->txseq); |
7019 | |
7020 | chan->rx_state = L2CAP_RX_STATE_SREJ_SENT; |
7021 | break; |
7022 | case L2CAP_TXSEQ_DUPLICATE: |
7023 | l2cap_pass_to_tx(chan, control); |
7024 | break; |
7025 | case L2CAP_TXSEQ_INVALID_IGNORE: |
7026 | break; |
7027 | case L2CAP_TXSEQ_INVALID: |
7028 | default: |
7029 | l2cap_send_disconn_req(chan, ECONNRESET); |
7030 | break; |
7031 | } |
7032 | break; |
7033 | case L2CAP_EV_RECV_RR: |
7034 | l2cap_pass_to_tx(chan, control); |
7035 | if (control->final) { |
7036 | clear_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
7037 | |
7038 | if (!test_and_clear_bit(nr: CONN_REJ_ACT, addr: &chan->conn_state) && |
7039 | !__chan_is_moving(chan)) { |
7040 | control->final = 0; |
7041 | l2cap_retransmit_all(chan, control); |
7042 | } |
7043 | |
7044 | l2cap_ertm_send(chan); |
7045 | } else if (control->poll) { |
7046 | l2cap_send_i_or_rr_or_rnr(chan); |
7047 | } else { |
7048 | if (test_and_clear_bit(nr: CONN_REMOTE_BUSY, |
7049 | addr: &chan->conn_state) && |
7050 | chan->unacked_frames) |
7051 | __set_retrans_timer(chan); |
7052 | |
7053 | l2cap_ertm_send(chan); |
7054 | } |
7055 | break; |
7056 | case L2CAP_EV_RECV_RNR: |
7057 | set_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
7058 | l2cap_pass_to_tx(chan, control); |
7059 | if (control && control->poll) { |
7060 | set_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state); |
7061 | l2cap_send_rr_or_rnr(chan, poll: 0); |
7062 | } |
7063 | __clear_retrans_timer(chan); |
7064 | l2cap_seq_list_clear(seq_list: &chan->retrans_list); |
7065 | break; |
7066 | case L2CAP_EV_RECV_REJ: |
7067 | l2cap_handle_rej(chan, control); |
7068 | break; |
7069 | case L2CAP_EV_RECV_SREJ: |
7070 | l2cap_handle_srej(chan, control); |
7071 | break; |
7072 | default: |
7073 | break; |
7074 | } |
7075 | |
7076 | if (skb && !skb_in_use) { |
7077 | BT_DBG("Freeing %p" , skb); |
7078 | kfree_skb(skb); |
7079 | } |
7080 | |
7081 | return err; |
7082 | } |
7083 | |
7084 | static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan, |
7085 | struct l2cap_ctrl *control, |
7086 | struct sk_buff *skb, u8 event) |
7087 | { |
7088 | int err = 0; |
7089 | u16 txseq = control->txseq; |
7090 | bool skb_in_use = false; |
7091 | |
7092 | BT_DBG("chan %p, control %p, skb %p, event %d" , chan, control, skb, |
7093 | event); |
7094 | |
7095 | switch (event) { |
7096 | case L2CAP_EV_RECV_IFRAME: |
7097 | switch (l2cap_classify_txseq(chan, txseq)) { |
7098 | case L2CAP_TXSEQ_EXPECTED: |
7099 | /* Keep frame for reassembly later */ |
7100 | l2cap_pass_to_tx(chan, control); |
7101 | skb_queue_tail(list: &chan->srej_q, newsk: skb); |
7102 | skb_in_use = true; |
7103 | BT_DBG("Queued %p (queue len %d)" , skb, |
7104 | skb_queue_len(&chan->srej_q)); |
7105 | |
7106 | chan->expected_tx_seq = __next_seq(chan, seq: txseq); |
7107 | break; |
7108 | case L2CAP_TXSEQ_EXPECTED_SREJ: |
7109 | l2cap_seq_list_pop(seq_list: &chan->srej_list); |
7110 | |
7111 | l2cap_pass_to_tx(chan, control); |
7112 | skb_queue_tail(list: &chan->srej_q, newsk: skb); |
7113 | skb_in_use = true; |
7114 | BT_DBG("Queued %p (queue len %d)" , skb, |
7115 | skb_queue_len(&chan->srej_q)); |
7116 | |
7117 | err = l2cap_rx_queued_iframes(chan); |
7118 | if (err) |
7119 | break; |
7120 | |
7121 | break; |
7122 | case L2CAP_TXSEQ_UNEXPECTED: |
7123 | /* Got a frame that can't be reassembled yet. |
7124 | * Save it for later, and send SREJs to cover |
7125 | * the missing frames. |
7126 | */ |
7127 | skb_queue_tail(list: &chan->srej_q, newsk: skb); |
7128 | skb_in_use = true; |
7129 | BT_DBG("Queued %p (queue len %d)" , skb, |
7130 | skb_queue_len(&chan->srej_q)); |
7131 | |
7132 | l2cap_pass_to_tx(chan, control); |
7133 | l2cap_send_srej(chan, txseq: control->txseq); |
7134 | break; |
7135 | case L2CAP_TXSEQ_UNEXPECTED_SREJ: |
7136 | /* This frame was requested with an SREJ, but |
7137 | * some expected retransmitted frames are |
7138 | * missing. Request retransmission of missing |
7139 | * SREJ'd frames. |
7140 | */ |
7141 | skb_queue_tail(list: &chan->srej_q, newsk: skb); |
7142 | skb_in_use = true; |
7143 | BT_DBG("Queued %p (queue len %d)" , skb, |
7144 | skb_queue_len(&chan->srej_q)); |
7145 | |
7146 | l2cap_pass_to_tx(chan, control); |
7147 | l2cap_send_srej_list(chan, txseq: control->txseq); |
7148 | break; |
7149 | case L2CAP_TXSEQ_DUPLICATE_SREJ: |
7150 | /* We've already queued this frame. Drop this copy. */ |
7151 | l2cap_pass_to_tx(chan, control); |
7152 | break; |
7153 | case L2CAP_TXSEQ_DUPLICATE: |
7154 | /* Expecting a later sequence number, so this frame |
7155 | * was already received. Ignore it completely. |
7156 | */ |
7157 | break; |
7158 | case L2CAP_TXSEQ_INVALID_IGNORE: |
7159 | break; |
7160 | case L2CAP_TXSEQ_INVALID: |
7161 | default: |
7162 | l2cap_send_disconn_req(chan, ECONNRESET); |
7163 | break; |
7164 | } |
7165 | break; |
7166 | case L2CAP_EV_RECV_RR: |
7167 | l2cap_pass_to_tx(chan, control); |
7168 | if (control->final) { |
7169 | clear_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
7170 | |
7171 | if (!test_and_clear_bit(nr: CONN_REJ_ACT, |
7172 | addr: &chan->conn_state)) { |
7173 | control->final = 0; |
7174 | l2cap_retransmit_all(chan, control); |
7175 | } |
7176 | |
7177 | l2cap_ertm_send(chan); |
7178 | } else if (control->poll) { |
7179 | if (test_and_clear_bit(nr: CONN_REMOTE_BUSY, |
7180 | addr: &chan->conn_state) && |
7181 | chan->unacked_frames) { |
7182 | __set_retrans_timer(chan); |
7183 | } |
7184 | |
7185 | set_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state); |
7186 | l2cap_send_srej_tail(chan); |
7187 | } else { |
7188 | if (test_and_clear_bit(nr: CONN_REMOTE_BUSY, |
7189 | addr: &chan->conn_state) && |
7190 | chan->unacked_frames) |
7191 | __set_retrans_timer(chan); |
7192 | |
7193 | l2cap_send_ack(chan); |
7194 | } |
7195 | break; |
7196 | case L2CAP_EV_RECV_RNR: |
7197 | set_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
7198 | l2cap_pass_to_tx(chan, control); |
7199 | if (control->poll) { |
7200 | l2cap_send_srej_tail(chan); |
7201 | } else { |
7202 | struct l2cap_ctrl rr_control; |
7203 | memset(&rr_control, 0, sizeof(rr_control)); |
7204 | rr_control.sframe = 1; |
7205 | rr_control.super = L2CAP_SUPER_RR; |
7206 | rr_control.reqseq = chan->buffer_seq; |
7207 | l2cap_send_sframe(chan, control: &rr_control); |
7208 | } |
7209 | |
7210 | break; |
7211 | case L2CAP_EV_RECV_REJ: |
7212 | l2cap_handle_rej(chan, control); |
7213 | break; |
7214 | case L2CAP_EV_RECV_SREJ: |
7215 | l2cap_handle_srej(chan, control); |
7216 | break; |
7217 | } |
7218 | |
7219 | if (skb && !skb_in_use) { |
7220 | BT_DBG("Freeing %p" , skb); |
7221 | kfree_skb(skb); |
7222 | } |
7223 | |
7224 | return err; |
7225 | } |
7226 | |
7227 | static int l2cap_finish_move(struct l2cap_chan *chan) |
7228 | { |
7229 | BT_DBG("chan %p" , chan); |
7230 | |
7231 | chan->rx_state = L2CAP_RX_STATE_RECV; |
7232 | |
7233 | if (chan->hs_hcon) |
7234 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; |
7235 | else |
7236 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; |
7237 | |
7238 | return l2cap_resegment(chan); |
7239 | } |
7240 | |
7241 | static int l2cap_rx_state_wait_p(struct l2cap_chan *chan, |
7242 | struct l2cap_ctrl *control, |
7243 | struct sk_buff *skb, u8 event) |
7244 | { |
7245 | int err; |
7246 | |
7247 | BT_DBG("chan %p, control %p, skb %p, event %d" , chan, control, skb, |
7248 | event); |
7249 | |
7250 | if (!control->poll) |
7251 | return -EPROTO; |
7252 | |
7253 | l2cap_process_reqseq(chan, reqseq: control->reqseq); |
7254 | |
7255 | if (!skb_queue_empty(list: &chan->tx_q)) |
7256 | chan->tx_send_head = skb_peek(list_: &chan->tx_q); |
7257 | else |
7258 | chan->tx_send_head = NULL; |
7259 | |
7260 | /* Rewind next_tx_seq to the point expected |
7261 | * by the receiver. |
7262 | */ |
7263 | chan->next_tx_seq = control->reqseq; |
7264 | chan->unacked_frames = 0; |
7265 | |
7266 | err = l2cap_finish_move(chan); |
7267 | if (err) |
7268 | return err; |
7269 | |
7270 | set_bit(nr: CONN_SEND_FBIT, addr: &chan->conn_state); |
7271 | l2cap_send_i_or_rr_or_rnr(chan); |
7272 | |
7273 | if (event == L2CAP_EV_RECV_IFRAME) |
7274 | return -EPROTO; |
7275 | |
7276 | return l2cap_rx_state_recv(chan, control, NULL, event); |
7277 | } |
7278 | |
7279 | static int l2cap_rx_state_wait_f(struct l2cap_chan *chan, |
7280 | struct l2cap_ctrl *control, |
7281 | struct sk_buff *skb, u8 event) |
7282 | { |
7283 | int err; |
7284 | |
7285 | if (!control->final) |
7286 | return -EPROTO; |
7287 | |
7288 | clear_bit(nr: CONN_REMOTE_BUSY, addr: &chan->conn_state); |
7289 | |
7290 | chan->rx_state = L2CAP_RX_STATE_RECV; |
7291 | l2cap_process_reqseq(chan, reqseq: control->reqseq); |
7292 | |
7293 | if (!skb_queue_empty(list: &chan->tx_q)) |
7294 | chan->tx_send_head = skb_peek(list_: &chan->tx_q); |
7295 | else |
7296 | chan->tx_send_head = NULL; |
7297 | |
7298 | /* Rewind next_tx_seq to the point expected |
7299 | * by the receiver. |
7300 | */ |
7301 | chan->next_tx_seq = control->reqseq; |
7302 | chan->unacked_frames = 0; |
7303 | |
7304 | if (chan->hs_hcon) |
7305 | chan->conn->mtu = chan->hs_hcon->hdev->block_mtu; |
7306 | else |
7307 | chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu; |
7308 | |
7309 | err = l2cap_resegment(chan); |
7310 | |
7311 | if (!err) |
7312 | err = l2cap_rx_state_recv(chan, control, skb, event); |
7313 | |
7314 | return err; |
7315 | } |
7316 | |
7317 | static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq) |
7318 | { |
7319 | /* Make sure reqseq is for a packet that has been sent but not acked */ |
7320 | u16 unacked; |
7321 | |
7322 | unacked = __seq_offset(chan, seq1: chan->next_tx_seq, seq2: chan->expected_ack_seq); |
7323 | return __seq_offset(chan, seq1: chan->next_tx_seq, seq2: reqseq) <= unacked; |
7324 | } |
7325 | |
7326 | static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
7327 | struct sk_buff *skb, u8 event) |
7328 | { |
7329 | int err = 0; |
7330 | |
7331 | BT_DBG("chan %p, control %p, skb %p, event %d, state %d" , chan, |
7332 | control, skb, event, chan->rx_state); |
7333 | |
7334 | if (__valid_reqseq(chan, reqseq: control->reqseq)) { |
7335 | switch (chan->rx_state) { |
7336 | case L2CAP_RX_STATE_RECV: |
7337 | err = l2cap_rx_state_recv(chan, control, skb, event); |
7338 | break; |
7339 | case L2CAP_RX_STATE_SREJ_SENT: |
7340 | err = l2cap_rx_state_srej_sent(chan, control, skb, |
7341 | event); |
7342 | break; |
7343 | case L2CAP_RX_STATE_WAIT_P: |
7344 | err = l2cap_rx_state_wait_p(chan, control, skb, event); |
7345 | break; |
7346 | case L2CAP_RX_STATE_WAIT_F: |
7347 | err = l2cap_rx_state_wait_f(chan, control, skb, event); |
7348 | break; |
7349 | default: |
7350 | /* shut it down */ |
7351 | break; |
7352 | } |
7353 | } else { |
7354 | BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d" , |
7355 | control->reqseq, chan->next_tx_seq, |
7356 | chan->expected_ack_seq); |
7357 | l2cap_send_disconn_req(chan, ECONNRESET); |
7358 | } |
7359 | |
7360 | return err; |
7361 | } |
7362 | |
7363 | static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control, |
7364 | struct sk_buff *skb) |
7365 | { |
7366 | /* l2cap_reassemble_sdu may free skb, hence invalidate control, so store |
7367 | * the txseq field in advance to use it after l2cap_reassemble_sdu |
7368 | * returns and to avoid the race condition, for example: |
7369 | * |
7370 | * The current thread calls: |
7371 | * l2cap_reassemble_sdu |
7372 | * chan->ops->recv == l2cap_sock_recv_cb |
7373 | * __sock_queue_rcv_skb |
7374 | * Another thread calls: |
7375 | * bt_sock_recvmsg |
7376 | * skb_recv_datagram |
7377 | * skb_free_datagram |
7378 | * Then the current thread tries to access control, but it was freed by |
7379 | * skb_free_datagram. |
7380 | */ |
7381 | u16 txseq = control->txseq; |
7382 | |
7383 | BT_DBG("chan %p, control %p, skb %p, state %d" , chan, control, skb, |
7384 | chan->rx_state); |
7385 | |
7386 | if (l2cap_classify_txseq(chan, txseq) == L2CAP_TXSEQ_EXPECTED) { |
7387 | l2cap_pass_to_tx(chan, control); |
7388 | |
7389 | BT_DBG("buffer_seq %u->%u" , chan->buffer_seq, |
7390 | __next_seq(chan, chan->buffer_seq)); |
7391 | |
7392 | chan->buffer_seq = __next_seq(chan, seq: chan->buffer_seq); |
7393 | |
7394 | l2cap_reassemble_sdu(chan, skb, control); |
7395 | } else { |
7396 | if (chan->sdu) { |
7397 | kfree_skb(skb: chan->sdu); |
7398 | chan->sdu = NULL; |
7399 | } |
7400 | chan->sdu_last_frag = NULL; |
7401 | chan->sdu_len = 0; |
7402 | |
7403 | if (skb) { |
7404 | BT_DBG("Freeing %p" , skb); |
7405 | kfree_skb(skb); |
7406 | } |
7407 | } |
7408 | |
7409 | chan->last_acked_seq = txseq; |
7410 | chan->expected_tx_seq = __next_seq(chan, seq: txseq); |
7411 | |
7412 | return 0; |
7413 | } |
7414 | |
7415 | static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
7416 | { |
7417 | struct l2cap_ctrl *control = &bt_cb(skb)->l2cap; |
7418 | u16 len; |
7419 | u8 event; |
7420 | |
7421 | __unpack_control(chan, skb); |
7422 | |
7423 | len = skb->len; |
7424 | |
7425 | /* |
7426 | * We can just drop the corrupted I-frame here. |
7427 | * Receiver will miss it and start proper recovery |
7428 | * procedures and ask for retransmission. |
7429 | */ |
7430 | if (l2cap_check_fcs(chan, skb)) |
7431 | goto drop; |
7432 | |
7433 | if (!control->sframe && control->sar == L2CAP_SAR_START) |
7434 | len -= L2CAP_SDULEN_SIZE; |
7435 | |
7436 | if (chan->fcs == L2CAP_FCS_CRC16) |
7437 | len -= L2CAP_FCS_SIZE; |
7438 | |
7439 | if (len > chan->mps) { |
7440 | l2cap_send_disconn_req(chan, ECONNRESET); |
7441 | goto drop; |
7442 | } |
7443 | |
7444 | if (chan->ops->filter) { |
7445 | if (chan->ops->filter(chan, skb)) |
7446 | goto drop; |
7447 | } |
7448 | |
7449 | if (!control->sframe) { |
7450 | int err; |
7451 | |
7452 | BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d" , |
7453 | control->sar, control->reqseq, control->final, |
7454 | control->txseq); |
7455 | |
7456 | /* Validate F-bit - F=0 always valid, F=1 only |
7457 | * valid in TX WAIT_F |
7458 | */ |
7459 | if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F) |
7460 | goto drop; |
7461 | |
7462 | if (chan->mode != L2CAP_MODE_STREAMING) { |
7463 | event = L2CAP_EV_RECV_IFRAME; |
7464 | err = l2cap_rx(chan, control, skb, event); |
7465 | } else { |
7466 | err = l2cap_stream_rx(chan, control, skb); |
7467 | } |
7468 | |
7469 | if (err) |
7470 | l2cap_send_disconn_req(chan, ECONNRESET); |
7471 | } else { |
7472 | const u8 rx_func_to_event[4] = { |
7473 | L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ, |
7474 | L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ |
7475 | }; |
7476 | |
7477 | /* Only I-frames are expected in streaming mode */ |
7478 | if (chan->mode == L2CAP_MODE_STREAMING) |
7479 | goto drop; |
7480 | |
7481 | BT_DBG("sframe reqseq %d, final %d, poll %d, super %d" , |
7482 | control->reqseq, control->final, control->poll, |
7483 | control->super); |
7484 | |
7485 | if (len != 0) { |
7486 | BT_ERR("Trailing bytes: %d in sframe" , len); |
7487 | l2cap_send_disconn_req(chan, ECONNRESET); |
7488 | goto drop; |
7489 | } |
7490 | |
7491 | /* Validate F and P bits */ |
7492 | if (control->final && (control->poll || |
7493 | chan->tx_state != L2CAP_TX_STATE_WAIT_F)) |
7494 | goto drop; |
7495 | |
7496 | event = rx_func_to_event[control->super]; |
7497 | if (l2cap_rx(chan, control, skb, event)) |
7498 | l2cap_send_disconn_req(chan, ECONNRESET); |
7499 | } |
7500 | |
7501 | return 0; |
7502 | |
7503 | drop: |
7504 | kfree_skb(skb); |
7505 | return 0; |
7506 | } |
7507 | |
7508 | static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) |
7509 | { |
7510 | struct l2cap_conn *conn = chan->conn; |
7511 | struct l2cap_le_credits pkt; |
7512 | u16 return_credits; |
7513 | |
7514 | return_credits = (chan->imtu / chan->mps) + 1; |
7515 | |
7516 | if (chan->rx_credits >= return_credits) |
7517 | return; |
7518 | |
7519 | return_credits -= chan->rx_credits; |
7520 | |
7521 | BT_DBG("chan %p returning %u credits to sender" , chan, return_credits); |
7522 | |
7523 | chan->rx_credits += return_credits; |
7524 | |
7525 | pkt.cid = cpu_to_le16(chan->scid); |
7526 | pkt.credits = cpu_to_le16(return_credits); |
7527 | |
7528 | chan->ident = l2cap_get_ident(conn); |
7529 | |
7530 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_LE_CREDITS, len: sizeof(pkt), data: &pkt); |
7531 | } |
7532 | |
7533 | static int l2cap_ecred_recv(struct l2cap_chan *chan, struct sk_buff *skb) |
7534 | { |
7535 | int err; |
7536 | |
7537 | BT_DBG("SDU reassemble complete: chan %p skb->len %u" , chan, skb->len); |
7538 | |
7539 | /* Wait recv to confirm reception before updating the credits */ |
7540 | err = chan->ops->recv(chan, skb); |
7541 | |
7542 | /* Update credits whenever an SDU is received */ |
7543 | l2cap_chan_le_send_credits(chan); |
7544 | |
7545 | return err; |
7546 | } |
7547 | |
7548 | static int l2cap_ecred_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
7549 | { |
7550 | int err; |
7551 | |
7552 | if (!chan->rx_credits) { |
7553 | BT_ERR("No credits to receive LE L2CAP data" ); |
7554 | l2cap_send_disconn_req(chan, ECONNRESET); |
7555 | return -ENOBUFS; |
7556 | } |
7557 | |
7558 | if (chan->imtu < skb->len) { |
7559 | BT_ERR("Too big LE L2CAP PDU" ); |
7560 | return -ENOBUFS; |
7561 | } |
7562 | |
7563 | chan->rx_credits--; |
7564 | BT_DBG("rx_credits %u -> %u" , chan->rx_credits + 1, chan->rx_credits); |
7565 | |
7566 | /* Update if remote had run out of credits, this should only happens |
7567 | * if the remote is not using the entire MPS. |
7568 | */ |
7569 | if (!chan->rx_credits) |
7570 | l2cap_chan_le_send_credits(chan); |
7571 | |
7572 | err = 0; |
7573 | |
7574 | if (!chan->sdu) { |
7575 | u16 sdu_len; |
7576 | |
7577 | sdu_len = get_unaligned_le16(p: skb->data); |
7578 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
7579 | |
7580 | BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u" , |
7581 | sdu_len, skb->len, chan->imtu); |
7582 | |
7583 | if (sdu_len > chan->imtu) { |
7584 | BT_ERR("Too big LE L2CAP SDU length received" ); |
7585 | err = -EMSGSIZE; |
7586 | goto failed; |
7587 | } |
7588 | |
7589 | if (skb->len > sdu_len) { |
7590 | BT_ERR("Too much LE L2CAP data received" ); |
7591 | err = -EINVAL; |
7592 | goto failed; |
7593 | } |
7594 | |
7595 | if (skb->len == sdu_len) |
7596 | return l2cap_ecred_recv(chan, skb); |
7597 | |
7598 | chan->sdu = skb; |
7599 | chan->sdu_len = sdu_len; |
7600 | chan->sdu_last_frag = skb; |
7601 | |
7602 | /* Detect if remote is not able to use the selected MPS */ |
7603 | if (skb->len + L2CAP_SDULEN_SIZE < chan->mps) { |
7604 | u16 mps_len = skb->len + L2CAP_SDULEN_SIZE; |
7605 | |
7606 | /* Adjust the number of credits */ |
7607 | BT_DBG("chan->mps %u -> %u" , chan->mps, mps_len); |
7608 | chan->mps = mps_len; |
7609 | l2cap_chan_le_send_credits(chan); |
7610 | } |
7611 | |
7612 | return 0; |
7613 | } |
7614 | |
7615 | BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u" , |
7616 | chan->sdu->len, skb->len, chan->sdu_len); |
7617 | |
7618 | if (chan->sdu->len + skb->len > chan->sdu_len) { |
7619 | BT_ERR("Too much LE L2CAP data received" ); |
7620 | err = -EINVAL; |
7621 | goto failed; |
7622 | } |
7623 | |
7624 | append_skb_frag(skb: chan->sdu, new_frag: skb, last_frag: &chan->sdu_last_frag); |
7625 | skb = NULL; |
7626 | |
7627 | if (chan->sdu->len == chan->sdu_len) { |
7628 | err = l2cap_ecred_recv(chan, skb: chan->sdu); |
7629 | if (!err) { |
7630 | chan->sdu = NULL; |
7631 | chan->sdu_last_frag = NULL; |
7632 | chan->sdu_len = 0; |
7633 | } |
7634 | } |
7635 | |
7636 | failed: |
7637 | if (err) { |
7638 | kfree_skb(skb); |
7639 | kfree_skb(skb: chan->sdu); |
7640 | chan->sdu = NULL; |
7641 | chan->sdu_last_frag = NULL; |
7642 | chan->sdu_len = 0; |
7643 | } |
7644 | |
7645 | /* We can't return an error here since we took care of the skb |
7646 | * freeing internally. An error return would cause the caller to |
7647 | * do a double-free of the skb. |
7648 | */ |
7649 | return 0; |
7650 | } |
7651 | |
7652 | static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid, |
7653 | struct sk_buff *skb) |
7654 | { |
7655 | struct l2cap_chan *chan; |
7656 | |
7657 | chan = l2cap_get_chan_by_scid(conn, cid); |
7658 | if (!chan) { |
7659 | if (cid == L2CAP_CID_A2MP) { |
7660 | chan = a2mp_channel_create(conn, skb); |
7661 | if (!chan) { |
7662 | kfree_skb(skb); |
7663 | return; |
7664 | } |
7665 | |
7666 | l2cap_chan_hold(c: chan); |
7667 | l2cap_chan_lock(chan); |
7668 | } else { |
7669 | BT_DBG("unknown cid 0x%4.4x" , cid); |
7670 | /* Drop packet and return */ |
7671 | kfree_skb(skb); |
7672 | return; |
7673 | } |
7674 | } |
7675 | |
7676 | BT_DBG("chan %p, len %d" , chan, skb->len); |
7677 | |
7678 | /* If we receive data on a fixed channel before the info req/rsp |
7679 | * procedure is done simply assume that the channel is supported |
7680 | * and mark it as ready. |
7681 | */ |
7682 | if (chan->chan_type == L2CAP_CHAN_FIXED) |
7683 | l2cap_chan_ready(chan); |
7684 | |
7685 | if (chan->state != BT_CONNECTED) |
7686 | goto drop; |
7687 | |
7688 | switch (chan->mode) { |
7689 | case L2CAP_MODE_LE_FLOWCTL: |
7690 | case L2CAP_MODE_EXT_FLOWCTL: |
7691 | if (l2cap_ecred_data_rcv(chan, skb) < 0) |
7692 | goto drop; |
7693 | |
7694 | goto done; |
7695 | |
7696 | case L2CAP_MODE_BASIC: |
7697 | /* If socket recv buffers overflows we drop data here |
7698 | * which is *bad* because L2CAP has to be reliable. |
7699 | * But we don't have any other choice. L2CAP doesn't |
7700 | * provide flow control mechanism. */ |
7701 | |
7702 | if (chan->imtu < skb->len) { |
7703 | BT_ERR("Dropping L2CAP data: receive buffer overflow" ); |
7704 | goto drop; |
7705 | } |
7706 | |
7707 | if (!chan->ops->recv(chan, skb)) |
7708 | goto done; |
7709 | break; |
7710 | |
7711 | case L2CAP_MODE_ERTM: |
7712 | case L2CAP_MODE_STREAMING: |
7713 | l2cap_data_rcv(chan, skb); |
7714 | goto done; |
7715 | |
7716 | default: |
7717 | BT_DBG("chan %p: bad mode 0x%2.2x" , chan, chan->mode); |
7718 | break; |
7719 | } |
7720 | |
7721 | drop: |
7722 | kfree_skb(skb); |
7723 | |
7724 | done: |
7725 | l2cap_chan_unlock(chan); |
7726 | l2cap_chan_put(chan); |
7727 | } |
7728 | |
7729 | static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, |
7730 | struct sk_buff *skb) |
7731 | { |
7732 | struct hci_conn *hcon = conn->hcon; |
7733 | struct l2cap_chan *chan; |
7734 | |
7735 | if (hcon->type != ACL_LINK) |
7736 | goto free_skb; |
7737 | |
7738 | chan = l2cap_global_chan_by_psm(state: 0, psm, src: &hcon->src, dst: &hcon->dst, |
7739 | ACL_LINK); |
7740 | if (!chan) |
7741 | goto free_skb; |
7742 | |
7743 | BT_DBG("chan %p, len %d" , chan, skb->len); |
7744 | |
7745 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
7746 | goto drop; |
7747 | |
7748 | if (chan->imtu < skb->len) |
7749 | goto drop; |
7750 | |
7751 | /* Store remote BD_ADDR and PSM for msg_name */ |
7752 | bacpy(dst: &bt_cb(skb)->l2cap.bdaddr, src: &hcon->dst); |
7753 | bt_cb(skb)->l2cap.psm = psm; |
7754 | |
7755 | if (!chan->ops->recv(chan, skb)) { |
7756 | l2cap_chan_put(chan); |
7757 | return; |
7758 | } |
7759 | |
7760 | drop: |
7761 | l2cap_chan_put(chan); |
7762 | free_skb: |
7763 | kfree_skb(skb); |
7764 | } |
7765 | |
7766 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
7767 | { |
7768 | struct l2cap_hdr *lh = (void *) skb->data; |
7769 | struct hci_conn *hcon = conn->hcon; |
7770 | u16 cid, len; |
7771 | __le16 psm; |
7772 | |
7773 | if (hcon->state != BT_CONNECTED) { |
7774 | BT_DBG("queueing pending rx skb" ); |
7775 | skb_queue_tail(list: &conn->pending_rx, newsk: skb); |
7776 | return; |
7777 | } |
7778 | |
7779 | skb_pull(skb, L2CAP_HDR_SIZE); |
7780 | cid = __le16_to_cpu(lh->cid); |
7781 | len = __le16_to_cpu(lh->len); |
7782 | |
7783 | if (len != skb->len) { |
7784 | kfree_skb(skb); |
7785 | return; |
7786 | } |
7787 | |
7788 | /* Since we can't actively block incoming LE connections we must |
7789 | * at least ensure that we ignore incoming data from them. |
7790 | */ |
7791 | if (hcon->type == LE_LINK && |
7792 | hci_bdaddr_list_lookup(list: &hcon->hdev->reject_list, bdaddr: &hcon->dst, |
7793 | type: bdaddr_dst_type(hcon))) { |
7794 | kfree_skb(skb); |
7795 | return; |
7796 | } |
7797 | |
7798 | BT_DBG("len %d, cid 0x%4.4x" , len, cid); |
7799 | |
7800 | switch (cid) { |
7801 | case L2CAP_CID_SIGNALING: |
7802 | l2cap_sig_channel(conn, skb); |
7803 | break; |
7804 | |
7805 | case L2CAP_CID_CONN_LESS: |
7806 | psm = get_unaligned((__le16 *) skb->data); |
7807 | skb_pull(skb, L2CAP_PSMLEN_SIZE); |
7808 | l2cap_conless_channel(conn, psm, skb); |
7809 | break; |
7810 | |
7811 | case L2CAP_CID_LE_SIGNALING: |
7812 | l2cap_le_sig_channel(conn, skb); |
7813 | break; |
7814 | |
7815 | default: |
7816 | l2cap_data_channel(conn, cid, skb); |
7817 | break; |
7818 | } |
7819 | } |
7820 | |
7821 | static void process_pending_rx(struct work_struct *work) |
7822 | { |
7823 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
7824 | pending_rx_work); |
7825 | struct sk_buff *skb; |
7826 | |
7827 | BT_DBG("" ); |
7828 | |
7829 | while ((skb = skb_dequeue(list: &conn->pending_rx))) |
7830 | l2cap_recv_frame(conn, skb); |
7831 | } |
7832 | |
7833 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon) |
7834 | { |
7835 | struct l2cap_conn *conn = hcon->l2cap_data; |
7836 | struct hci_chan *hchan; |
7837 | |
7838 | if (conn) |
7839 | return conn; |
7840 | |
7841 | hchan = hci_chan_create(conn: hcon); |
7842 | if (!hchan) |
7843 | return NULL; |
7844 | |
7845 | conn = kzalloc(size: sizeof(*conn), GFP_KERNEL); |
7846 | if (!conn) { |
7847 | hci_chan_del(chan: hchan); |
7848 | return NULL; |
7849 | } |
7850 | |
7851 | kref_init(kref: &conn->ref); |
7852 | hcon->l2cap_data = conn; |
7853 | conn->hcon = hci_conn_get(conn: hcon); |
7854 | conn->hchan = hchan; |
7855 | |
7856 | BT_DBG("hcon %p conn %p hchan %p" , hcon, conn, hchan); |
7857 | |
7858 | switch (hcon->type) { |
7859 | case LE_LINK: |
7860 | if (hcon->hdev->le_mtu) { |
7861 | conn->mtu = hcon->hdev->le_mtu; |
7862 | break; |
7863 | } |
7864 | fallthrough; |
7865 | default: |
7866 | conn->mtu = hcon->hdev->acl_mtu; |
7867 | break; |
7868 | } |
7869 | |
7870 | conn->feat_mask = 0; |
7871 | |
7872 | conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS; |
7873 | |
7874 | if (hcon->type == ACL_LINK && |
7875 | hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED)) |
7876 | conn->local_fixed_chan |= L2CAP_FC_A2MP; |
7877 | |
7878 | if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) && |
7879 | (bredr_sc_enabled(hcon->hdev) || |
7880 | hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP))) |
7881 | conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR; |
7882 | |
7883 | mutex_init(&conn->ident_lock); |
7884 | mutex_init(&conn->chan_lock); |
7885 | |
7886 | INIT_LIST_HEAD(list: &conn->chan_l); |
7887 | INIT_LIST_HEAD(list: &conn->users); |
7888 | |
7889 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
7890 | |
7891 | skb_queue_head_init(list: &conn->pending_rx); |
7892 | INIT_WORK(&conn->pending_rx_work, process_pending_rx); |
7893 | INIT_DELAYED_WORK(&conn->id_addr_timer, l2cap_conn_update_id_addr); |
7894 | |
7895 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
7896 | |
7897 | return conn; |
7898 | } |
7899 | |
7900 | static bool is_valid_psm(u16 psm, u8 dst_type) |
7901 | { |
7902 | if (!psm) |
7903 | return false; |
7904 | |
7905 | if (bdaddr_type_is_le(type: dst_type)) |
7906 | return (psm <= 0x00ff); |
7907 | |
7908 | /* PSM must be odd and lsb of upper byte must be 0 */ |
7909 | return ((psm & 0x0101) == 0x0001); |
7910 | } |
7911 | |
7912 | struct l2cap_chan_data { |
7913 | struct l2cap_chan *chan; |
7914 | struct pid *pid; |
7915 | int count; |
7916 | }; |
7917 | |
7918 | static void l2cap_chan_by_pid(struct l2cap_chan *chan, void *data) |
7919 | { |
7920 | struct l2cap_chan_data *d = data; |
7921 | struct pid *pid; |
7922 | |
7923 | if (chan == d->chan) |
7924 | return; |
7925 | |
7926 | if (!test_bit(FLAG_DEFER_SETUP, &chan->flags)) |
7927 | return; |
7928 | |
7929 | pid = chan->ops->get_peer_pid(chan); |
7930 | |
7931 | /* Only count deferred channels with the same PID/PSM */ |
7932 | if (d->pid != pid || chan->psm != d->chan->psm || chan->ident || |
7933 | chan->mode != L2CAP_MODE_EXT_FLOWCTL || chan->state != BT_CONNECT) |
7934 | return; |
7935 | |
7936 | d->count++; |
7937 | } |
7938 | |
7939 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
7940 | bdaddr_t *dst, u8 dst_type) |
7941 | { |
7942 | struct l2cap_conn *conn; |
7943 | struct hci_conn *hcon; |
7944 | struct hci_dev *hdev; |
7945 | int err; |
7946 | |
7947 | BT_DBG("%pMR -> %pMR (type %u) psm 0x%4.4x mode 0x%2.2x" , &chan->src, |
7948 | dst, dst_type, __le16_to_cpu(psm), chan->mode); |
7949 | |
7950 | hdev = hci_get_route(dst, src: &chan->src, src_type: chan->src_type); |
7951 | if (!hdev) |
7952 | return -EHOSTUNREACH; |
7953 | |
7954 | hci_dev_lock(hdev); |
7955 | |
7956 | if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid && |
7957 | chan->chan_type != L2CAP_CHAN_RAW) { |
7958 | err = -EINVAL; |
7959 | goto done; |
7960 | } |
7961 | |
7962 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) { |
7963 | err = -EINVAL; |
7964 | goto done; |
7965 | } |
7966 | |
7967 | if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) { |
7968 | err = -EINVAL; |
7969 | goto done; |
7970 | } |
7971 | |
7972 | switch (chan->mode) { |
7973 | case L2CAP_MODE_BASIC: |
7974 | break; |
7975 | case L2CAP_MODE_LE_FLOWCTL: |
7976 | break; |
7977 | case L2CAP_MODE_EXT_FLOWCTL: |
7978 | if (!enable_ecred) { |
7979 | err = -EOPNOTSUPP; |
7980 | goto done; |
7981 | } |
7982 | break; |
7983 | case L2CAP_MODE_ERTM: |
7984 | case L2CAP_MODE_STREAMING: |
7985 | if (!disable_ertm) |
7986 | break; |
7987 | fallthrough; |
7988 | default: |
7989 | err = -EOPNOTSUPP; |
7990 | goto done; |
7991 | } |
7992 | |
7993 | switch (chan->state) { |
7994 | case BT_CONNECT: |
7995 | case BT_CONNECT2: |
7996 | case BT_CONFIG: |
7997 | /* Already connecting */ |
7998 | err = 0; |
7999 | goto done; |
8000 | |
8001 | case BT_CONNECTED: |
8002 | /* Already connected */ |
8003 | err = -EISCONN; |
8004 | goto done; |
8005 | |
8006 | case BT_OPEN: |
8007 | case BT_BOUND: |
8008 | /* Can connect */ |
8009 | break; |
8010 | |
8011 | default: |
8012 | err = -EBADFD; |
8013 | goto done; |
8014 | } |
8015 | |
8016 | /* Set destination address and psm */ |
8017 | bacpy(dst: &chan->dst, src: dst); |
8018 | chan->dst_type = dst_type; |
8019 | |
8020 | chan->psm = psm; |
8021 | chan->dcid = cid; |
8022 | |
8023 | if (bdaddr_type_is_le(type: dst_type)) { |
8024 | /* Convert from L2CAP channel address type to HCI address type |
8025 | */ |
8026 | if (dst_type == BDADDR_LE_PUBLIC) |
8027 | dst_type = ADDR_LE_DEV_PUBLIC; |
8028 | else |
8029 | dst_type = ADDR_LE_DEV_RANDOM; |
8030 | |
8031 | if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) |
8032 | hcon = hci_connect_le(hdev, dst, dst_type, dst_resolved: false, |
8033 | sec_level: chan->sec_level, |
8034 | HCI_LE_CONN_TIMEOUT, |
8035 | HCI_ROLE_SLAVE); |
8036 | else |
8037 | hcon = hci_connect_le_scan(hdev, dst, dst_type, |
8038 | sec_level: chan->sec_level, |
8039 | HCI_LE_CONN_TIMEOUT, |
8040 | conn_reason: CONN_REASON_L2CAP_CHAN); |
8041 | |
8042 | } else { |
8043 | u8 auth_type = l2cap_get_auth_type(chan); |
8044 | hcon = hci_connect_acl(hdev, dst, sec_level: chan->sec_level, auth_type, |
8045 | conn_reason: CONN_REASON_L2CAP_CHAN); |
8046 | } |
8047 | |
8048 | if (IS_ERR(ptr: hcon)) { |
8049 | err = PTR_ERR(ptr: hcon); |
8050 | goto done; |
8051 | } |
8052 | |
8053 | conn = l2cap_conn_add(hcon); |
8054 | if (!conn) { |
8055 | hci_conn_drop(conn: hcon); |
8056 | err = -ENOMEM; |
8057 | goto done; |
8058 | } |
8059 | |
8060 | if (chan->mode == L2CAP_MODE_EXT_FLOWCTL) { |
8061 | struct l2cap_chan_data data; |
8062 | |
8063 | data.chan = chan; |
8064 | data.pid = chan->ops->get_peer_pid(chan); |
8065 | data.count = 1; |
8066 | |
8067 | l2cap_chan_list(conn, l2cap_chan_by_pid, &data); |
8068 | |
8069 | /* Check if there isn't too many channels being connected */ |
8070 | if (data.count > L2CAP_ECRED_CONN_SCID_MAX) { |
8071 | hci_conn_drop(conn: hcon); |
8072 | err = -EPROTO; |
8073 | goto done; |
8074 | } |
8075 | } |
8076 | |
8077 | mutex_lock(&conn->chan_lock); |
8078 | l2cap_chan_lock(chan); |
8079 | |
8080 | if (cid && __l2cap_get_chan_by_dcid(conn, cid)) { |
8081 | hci_conn_drop(conn: hcon); |
8082 | err = -EBUSY; |
8083 | goto chan_unlock; |
8084 | } |
8085 | |
8086 | /* Update source addr of the socket */ |
8087 | bacpy(dst: &chan->src, src: &hcon->src); |
8088 | chan->src_type = bdaddr_src_type(hcon); |
8089 | |
8090 | __l2cap_chan_add(conn, chan); |
8091 | |
8092 | /* l2cap_chan_add takes its own ref so we can drop this one */ |
8093 | hci_conn_drop(conn: hcon); |
8094 | |
8095 | l2cap_state_change(chan, state: BT_CONNECT); |
8096 | __set_chan_timer(chan, chan->ops->get_sndtimeo(chan)); |
8097 | |
8098 | /* Release chan->sport so that it can be reused by other |
8099 | * sockets (as it's only used for listening sockets). |
8100 | */ |
8101 | write_lock(&chan_list_lock); |
8102 | chan->sport = 0; |
8103 | write_unlock(&chan_list_lock); |
8104 | |
8105 | if (hcon->state == BT_CONNECTED) { |
8106 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
8107 | __clear_chan_timer(chan); |
8108 | if (l2cap_chan_check_security(chan, initiator: true)) |
8109 | l2cap_state_change(chan, state: BT_CONNECTED); |
8110 | } else |
8111 | l2cap_do_start(chan); |
8112 | } |
8113 | |
8114 | err = 0; |
8115 | |
8116 | chan_unlock: |
8117 | l2cap_chan_unlock(chan); |
8118 | mutex_unlock(lock: &conn->chan_lock); |
8119 | done: |
8120 | hci_dev_unlock(hdev); |
8121 | hci_dev_put(d: hdev); |
8122 | return err; |
8123 | } |
8124 | EXPORT_SYMBOL_GPL(l2cap_chan_connect); |
8125 | |
8126 | static void l2cap_ecred_reconfigure(struct l2cap_chan *chan) |
8127 | { |
8128 | struct l2cap_conn *conn = chan->conn; |
8129 | struct { |
8130 | struct l2cap_ecred_reconf_req req; |
8131 | __le16 scid; |
8132 | } pdu; |
8133 | |
8134 | pdu.req.mtu = cpu_to_le16(chan->imtu); |
8135 | pdu.req.mps = cpu_to_le16(chan->mps); |
8136 | pdu.scid = cpu_to_le16(chan->scid); |
8137 | |
8138 | chan->ident = l2cap_get_ident(conn); |
8139 | |
8140 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_ECRED_RECONF_REQ, |
8141 | len: sizeof(pdu), data: &pdu); |
8142 | } |
8143 | |
8144 | int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu) |
8145 | { |
8146 | if (chan->imtu > mtu) |
8147 | return -EINVAL; |
8148 | |
8149 | BT_DBG("chan %p mtu 0x%4.4x" , chan, mtu); |
8150 | |
8151 | chan->imtu = mtu; |
8152 | |
8153 | l2cap_ecred_reconfigure(chan); |
8154 | |
8155 | return 0; |
8156 | } |
8157 | |
8158 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
8159 | |
8160 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
8161 | { |
8162 | int exact = 0, lm1 = 0, lm2 = 0; |
8163 | struct l2cap_chan *c; |
8164 | |
8165 | BT_DBG("hdev %s, bdaddr %pMR" , hdev->name, bdaddr); |
8166 | |
8167 | /* Find listening sockets and check their link_mode */ |
8168 | read_lock(&chan_list_lock); |
8169 | list_for_each_entry(c, &chan_list, global_l) { |
8170 | if (c->state != BT_LISTEN) |
8171 | continue; |
8172 | |
8173 | if (!bacmp(ba1: &c->src, ba2: &hdev->bdaddr)) { |
8174 | lm1 |= HCI_LM_ACCEPT; |
8175 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
8176 | lm1 |= HCI_LM_MASTER; |
8177 | exact++; |
8178 | } else if (!bacmp(ba1: &c->src, BDADDR_ANY)) { |
8179 | lm2 |= HCI_LM_ACCEPT; |
8180 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
8181 | lm2 |= HCI_LM_MASTER; |
8182 | } |
8183 | } |
8184 | read_unlock(&chan_list_lock); |
8185 | |
8186 | return exact ? lm1 : lm2; |
8187 | } |
8188 | |
8189 | /* Find the next fixed channel in BT_LISTEN state, continue iteration |
8190 | * from an existing channel in the list or from the beginning of the |
8191 | * global list (by passing NULL as first parameter). |
8192 | */ |
8193 | static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c, |
8194 | struct hci_conn *hcon) |
8195 | { |
8196 | u8 src_type = bdaddr_src_type(hcon); |
8197 | |
8198 | read_lock(&chan_list_lock); |
8199 | |
8200 | if (c) |
8201 | c = list_next_entry(c, global_l); |
8202 | else |
8203 | c = list_entry(chan_list.next, typeof(*c), global_l); |
8204 | |
8205 | list_for_each_entry_from(c, &chan_list, global_l) { |
8206 | if (c->chan_type != L2CAP_CHAN_FIXED) |
8207 | continue; |
8208 | if (c->state != BT_LISTEN) |
8209 | continue; |
8210 | if (bacmp(ba1: &c->src, ba2: &hcon->src) && bacmp(ba1: &c->src, BDADDR_ANY)) |
8211 | continue; |
8212 | if (src_type != c->src_type) |
8213 | continue; |
8214 | |
8215 | c = l2cap_chan_hold_unless_zero(c); |
8216 | read_unlock(&chan_list_lock); |
8217 | return c; |
8218 | } |
8219 | |
8220 | read_unlock(&chan_list_lock); |
8221 | |
8222 | return NULL; |
8223 | } |
8224 | |
8225 | static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
8226 | { |
8227 | struct hci_dev *hdev = hcon->hdev; |
8228 | struct l2cap_conn *conn; |
8229 | struct l2cap_chan *pchan; |
8230 | u8 dst_type; |
8231 | |
8232 | if (hcon->type != ACL_LINK && hcon->type != LE_LINK) |
8233 | return; |
8234 | |
8235 | BT_DBG("hcon %p bdaddr %pMR status %d" , hcon, &hcon->dst, status); |
8236 | |
8237 | if (status) { |
8238 | l2cap_conn_del(hcon, err: bt_to_errno(code: status)); |
8239 | return; |
8240 | } |
8241 | |
8242 | conn = l2cap_conn_add(hcon); |
8243 | if (!conn) |
8244 | return; |
8245 | |
8246 | dst_type = bdaddr_dst_type(hcon); |
8247 | |
8248 | /* If device is blocked, do not create channels for it */ |
8249 | if (hci_bdaddr_list_lookup(list: &hdev->reject_list, bdaddr: &hcon->dst, type: dst_type)) |
8250 | return; |
8251 | |
8252 | /* Find fixed channels and notify them of the new connection. We |
8253 | * use multiple individual lookups, continuing each time where |
8254 | * we left off, because the list lock would prevent calling the |
8255 | * potentially sleeping l2cap_chan_lock() function. |
8256 | */ |
8257 | pchan = l2cap_global_fixed_chan(NULL, hcon); |
8258 | while (pchan) { |
8259 | struct l2cap_chan *chan, *next; |
8260 | |
8261 | /* Client fixed channels should override server ones */ |
8262 | if (__l2cap_get_chan_by_dcid(conn, cid: pchan->scid)) |
8263 | goto next; |
8264 | |
8265 | l2cap_chan_lock(chan: pchan); |
8266 | chan = pchan->ops->new_connection(pchan); |
8267 | if (chan) { |
8268 | bacpy(dst: &chan->src, src: &hcon->src); |
8269 | bacpy(dst: &chan->dst, src: &hcon->dst); |
8270 | chan->src_type = bdaddr_src_type(hcon); |
8271 | chan->dst_type = dst_type; |
8272 | |
8273 | __l2cap_chan_add(conn, chan); |
8274 | } |
8275 | |
8276 | l2cap_chan_unlock(chan: pchan); |
8277 | next: |
8278 | next = l2cap_global_fixed_chan(c: pchan, hcon); |
8279 | l2cap_chan_put(pchan); |
8280 | pchan = next; |
8281 | } |
8282 | |
8283 | l2cap_conn_ready(conn); |
8284 | } |
8285 | |
8286 | int l2cap_disconn_ind(struct hci_conn *hcon) |
8287 | { |
8288 | struct l2cap_conn *conn = hcon->l2cap_data; |
8289 | |
8290 | BT_DBG("hcon %p" , hcon); |
8291 | |
8292 | if (!conn) |
8293 | return HCI_ERROR_REMOTE_USER_TERM; |
8294 | return conn->disc_reason; |
8295 | } |
8296 | |
8297 | static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
8298 | { |
8299 | if (hcon->type != ACL_LINK && hcon->type != LE_LINK) |
8300 | return; |
8301 | |
8302 | BT_DBG("hcon %p reason %d" , hcon, reason); |
8303 | |
8304 | l2cap_conn_del(hcon, err: bt_to_errno(code: reason)); |
8305 | } |
8306 | |
8307 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
8308 | { |
8309 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
8310 | return; |
8311 | |
8312 | if (encrypt == 0x00) { |
8313 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
8314 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
8315 | } else if (chan->sec_level == BT_SECURITY_HIGH || |
8316 | chan->sec_level == BT_SECURITY_FIPS) |
8317 | l2cap_chan_close(chan, ECONNREFUSED); |
8318 | } else { |
8319 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
8320 | __clear_chan_timer(chan); |
8321 | } |
8322 | } |
8323 | |
8324 | static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
8325 | { |
8326 | struct l2cap_conn *conn = hcon->l2cap_data; |
8327 | struct l2cap_chan *chan; |
8328 | |
8329 | if (!conn) |
8330 | return; |
8331 | |
8332 | BT_DBG("conn %p status 0x%2.2x encrypt %u" , conn, status, encrypt); |
8333 | |
8334 | mutex_lock(&conn->chan_lock); |
8335 | |
8336 | list_for_each_entry(chan, &conn->chan_l, list) { |
8337 | l2cap_chan_lock(chan); |
8338 | |
8339 | BT_DBG("chan %p scid 0x%4.4x state %s" , chan, chan->scid, |
8340 | state_to_string(chan->state)); |
8341 | |
8342 | if (chan->scid == L2CAP_CID_A2MP) { |
8343 | l2cap_chan_unlock(chan); |
8344 | continue; |
8345 | } |
8346 | |
8347 | if (!status && encrypt) |
8348 | chan->sec_level = hcon->sec_level; |
8349 | |
8350 | if (!__l2cap_no_conn_pending(chan)) { |
8351 | l2cap_chan_unlock(chan); |
8352 | continue; |
8353 | } |
8354 | |
8355 | if (!status && (chan->state == BT_CONNECTED || |
8356 | chan->state == BT_CONFIG)) { |
8357 | chan->ops->resume(chan); |
8358 | l2cap_check_encryption(chan, encrypt); |
8359 | l2cap_chan_unlock(chan); |
8360 | continue; |
8361 | } |
8362 | |
8363 | if (chan->state == BT_CONNECT) { |
8364 | if (!status && l2cap_check_enc_key_size(hcon)) |
8365 | l2cap_start_connection(chan); |
8366 | else |
8367 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
8368 | } else if (chan->state == BT_CONNECT2 && |
8369 | !(chan->mode == L2CAP_MODE_EXT_FLOWCTL || |
8370 | chan->mode == L2CAP_MODE_LE_FLOWCTL)) { |
8371 | struct l2cap_conn_rsp rsp; |
8372 | __u16 res, stat; |
8373 | |
8374 | if (!status && l2cap_check_enc_key_size(hcon)) { |
8375 | if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) { |
8376 | res = L2CAP_CR_PEND; |
8377 | stat = L2CAP_CS_AUTHOR_PEND; |
8378 | chan->ops->defer(chan); |
8379 | } else { |
8380 | l2cap_state_change(chan, state: BT_CONFIG); |
8381 | res = L2CAP_CR_SUCCESS; |
8382 | stat = L2CAP_CS_NO_INFO; |
8383 | } |
8384 | } else { |
8385 | l2cap_state_change(chan, state: BT_DISCONN); |
8386 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
8387 | res = L2CAP_CR_SEC_BLOCK; |
8388 | stat = L2CAP_CS_NO_INFO; |
8389 | } |
8390 | |
8391 | rsp.scid = cpu_to_le16(chan->dcid); |
8392 | rsp.dcid = cpu_to_le16(chan->scid); |
8393 | rsp.result = cpu_to_le16(res); |
8394 | rsp.status = cpu_to_le16(stat); |
8395 | l2cap_send_cmd(conn, ident: chan->ident, L2CAP_CONN_RSP, |
8396 | len: sizeof(rsp), data: &rsp); |
8397 | |
8398 | if (!test_bit(CONF_REQ_SENT, &chan->conf_state) && |
8399 | res == L2CAP_CR_SUCCESS) { |
8400 | char buf[128]; |
8401 | set_bit(nr: CONF_REQ_SENT, addr: &chan->conf_state); |
8402 | l2cap_send_cmd(conn, ident: l2cap_get_ident(conn), |
8403 | L2CAP_CONF_REQ, |
8404 | len: l2cap_build_conf_req(chan, data: buf, data_size: sizeof(buf)), |
8405 | data: buf); |
8406 | chan->num_conf_req++; |
8407 | } |
8408 | } |
8409 | |
8410 | l2cap_chan_unlock(chan); |
8411 | } |
8412 | |
8413 | mutex_unlock(lock: &conn->chan_lock); |
8414 | } |
8415 | |
8416 | /* Append fragment into frame respecting the maximum len of rx_skb */ |
8417 | static int l2cap_recv_frag(struct l2cap_conn *conn, struct sk_buff *skb, |
8418 | u16 len) |
8419 | { |
8420 | if (!conn->rx_skb) { |
8421 | /* Allocate skb for the complete frame (with header) */ |
8422 | conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); |
8423 | if (!conn->rx_skb) |
8424 | return -ENOMEM; |
8425 | /* Init rx_len */ |
8426 | conn->rx_len = len; |
8427 | } |
8428 | |
8429 | /* Copy as much as the rx_skb can hold */ |
8430 | len = min_t(u16, len, skb->len); |
8431 | skb_copy_from_linear_data(skb, to: skb_put(skb: conn->rx_skb, len), len); |
8432 | skb_pull(skb, len); |
8433 | conn->rx_len -= len; |
8434 | |
8435 | return len; |
8436 | } |
8437 | |
8438 | static int l2cap_recv_len(struct l2cap_conn *conn, struct sk_buff *skb) |
8439 | { |
8440 | struct sk_buff *rx_skb; |
8441 | int len; |
8442 | |
8443 | /* Append just enough to complete the header */ |
8444 | len = l2cap_recv_frag(conn, skb, L2CAP_LEN_SIZE - conn->rx_skb->len); |
8445 | |
8446 | /* If header could not be read just continue */ |
8447 | if (len < 0 || conn->rx_skb->len < L2CAP_LEN_SIZE) |
8448 | return len; |
8449 | |
8450 | rx_skb = conn->rx_skb; |
8451 | len = get_unaligned_le16(p: rx_skb->data); |
8452 | |
8453 | /* Check if rx_skb has enough space to received all fragments */ |
8454 | if (len + (L2CAP_HDR_SIZE - L2CAP_LEN_SIZE) <= skb_tailroom(skb: rx_skb)) { |
8455 | /* Update expected len */ |
8456 | conn->rx_len = len + (L2CAP_HDR_SIZE - L2CAP_LEN_SIZE); |
8457 | return L2CAP_LEN_SIZE; |
8458 | } |
8459 | |
8460 | /* Reset conn->rx_skb since it will need to be reallocated in order to |
8461 | * fit all fragments. |
8462 | */ |
8463 | conn->rx_skb = NULL; |
8464 | |
8465 | /* Reallocates rx_skb using the exact expected length */ |
8466 | len = l2cap_recv_frag(conn, skb: rx_skb, |
8467 | len: len + (L2CAP_HDR_SIZE - L2CAP_LEN_SIZE)); |
8468 | kfree_skb(skb: rx_skb); |
8469 | |
8470 | return len; |
8471 | } |
8472 | |
8473 | static void l2cap_recv_reset(struct l2cap_conn *conn) |
8474 | { |
8475 | kfree_skb(skb: conn->rx_skb); |
8476 | conn->rx_skb = NULL; |
8477 | conn->rx_len = 0; |
8478 | } |
8479 | |
8480 | void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
8481 | { |
8482 | struct l2cap_conn *conn = hcon->l2cap_data; |
8483 | int len; |
8484 | |
8485 | /* For AMP controller do not create l2cap conn */ |
8486 | if (!conn && hcon->hdev->dev_type != HCI_PRIMARY) |
8487 | goto drop; |
8488 | |
8489 | if (!conn) |
8490 | conn = l2cap_conn_add(hcon); |
8491 | |
8492 | if (!conn) |
8493 | goto drop; |
8494 | |
8495 | BT_DBG("conn %p len %u flags 0x%x" , conn, skb->len, flags); |
8496 | |
8497 | switch (flags) { |
8498 | case ACL_START: |
8499 | case ACL_START_NO_FLUSH: |
8500 | case ACL_COMPLETE: |
8501 | if (conn->rx_skb) { |
8502 | BT_ERR("Unexpected start frame (len %d)" , skb->len); |
8503 | l2cap_recv_reset(conn); |
8504 | l2cap_conn_unreliable(conn, ECOMM); |
8505 | } |
8506 | |
8507 | /* Start fragment may not contain the L2CAP length so just |
8508 | * copy the initial byte when that happens and use conn->mtu as |
8509 | * expected length. |
8510 | */ |
8511 | if (skb->len < L2CAP_LEN_SIZE) { |
8512 | l2cap_recv_frag(conn, skb, len: conn->mtu); |
8513 | break; |
8514 | } |
8515 | |
8516 | len = get_unaligned_le16(p: skb->data) + L2CAP_HDR_SIZE; |
8517 | |
8518 | if (len == skb->len) { |
8519 | /* Complete frame received */ |
8520 | l2cap_recv_frame(conn, skb); |
8521 | return; |
8522 | } |
8523 | |
8524 | BT_DBG("Start: total len %d, frag len %u" , len, skb->len); |
8525 | |
8526 | if (skb->len > len) { |
8527 | BT_ERR("Frame is too long (len %u, expected len %d)" , |
8528 | skb->len, len); |
8529 | l2cap_conn_unreliable(conn, ECOMM); |
8530 | goto drop; |
8531 | } |
8532 | |
8533 | /* Append fragment into frame (with header) */ |
8534 | if (l2cap_recv_frag(conn, skb, len) < 0) |
8535 | goto drop; |
8536 | |
8537 | break; |
8538 | |
8539 | case ACL_CONT: |
8540 | BT_DBG("Cont: frag len %u (expecting %u)" , skb->len, conn->rx_len); |
8541 | |
8542 | if (!conn->rx_skb) { |
8543 | BT_ERR("Unexpected continuation frame (len %d)" , skb->len); |
8544 | l2cap_conn_unreliable(conn, ECOMM); |
8545 | goto drop; |
8546 | } |
8547 | |
8548 | /* Complete the L2CAP length if it has not been read */ |
8549 | if (conn->rx_skb->len < L2CAP_LEN_SIZE) { |
8550 | if (l2cap_recv_len(conn, skb) < 0) { |
8551 | l2cap_conn_unreliable(conn, ECOMM); |
8552 | goto drop; |
8553 | } |
8554 | |
8555 | /* Header still could not be read just continue */ |
8556 | if (conn->rx_skb->len < L2CAP_LEN_SIZE) |
8557 | break; |
8558 | } |
8559 | |
8560 | if (skb->len > conn->rx_len) { |
8561 | BT_ERR("Fragment is too long (len %u, expected %u)" , |
8562 | skb->len, conn->rx_len); |
8563 | l2cap_recv_reset(conn); |
8564 | l2cap_conn_unreliable(conn, ECOMM); |
8565 | goto drop; |
8566 | } |
8567 | |
8568 | /* Append fragment into frame (with header) */ |
8569 | l2cap_recv_frag(conn, skb, len: skb->len); |
8570 | |
8571 | if (!conn->rx_len) { |
8572 | /* Complete frame received. l2cap_recv_frame |
8573 | * takes ownership of the skb so set the global |
8574 | * rx_skb pointer to NULL first. |
8575 | */ |
8576 | struct sk_buff *rx_skb = conn->rx_skb; |
8577 | conn->rx_skb = NULL; |
8578 | l2cap_recv_frame(conn, skb: rx_skb); |
8579 | } |
8580 | break; |
8581 | } |
8582 | |
8583 | drop: |
8584 | kfree_skb(skb); |
8585 | } |
8586 | |
8587 | static struct hci_cb l2cap_cb = { |
8588 | .name = "L2CAP" , |
8589 | .connect_cfm = l2cap_connect_cfm, |
8590 | .disconn_cfm = l2cap_disconn_cfm, |
8591 | .security_cfm = l2cap_security_cfm, |
8592 | }; |
8593 | |
8594 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
8595 | { |
8596 | struct l2cap_chan *c; |
8597 | |
8598 | read_lock(&chan_list_lock); |
8599 | |
8600 | list_for_each_entry(c, &chan_list, global_l) { |
8601 | seq_printf(m: f, fmt: "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n" , |
8602 | &c->src, c->src_type, &c->dst, c->dst_type, |
8603 | c->state, __le16_to_cpu(c->psm), |
8604 | c->scid, c->dcid, c->imtu, c->omtu, |
8605 | c->sec_level, c->mode); |
8606 | } |
8607 | |
8608 | read_unlock(&chan_list_lock); |
8609 | |
8610 | return 0; |
8611 | } |
8612 | |
8613 | DEFINE_SHOW_ATTRIBUTE(l2cap_debugfs); |
8614 | |
8615 | static struct dentry *l2cap_debugfs; |
8616 | |
8617 | int __init l2cap_init(void) |
8618 | { |
8619 | int err; |
8620 | |
8621 | err = l2cap_init_sockets(); |
8622 | if (err < 0) |
8623 | return err; |
8624 | |
8625 | hci_register_cb(hcb: &l2cap_cb); |
8626 | |
8627 | if (IS_ERR_OR_NULL(ptr: bt_debugfs)) |
8628 | return 0; |
8629 | |
8630 | l2cap_debugfs = debugfs_create_file(name: "l2cap" , mode: 0444, parent: bt_debugfs, |
8631 | NULL, fops: &l2cap_debugfs_fops); |
8632 | |
8633 | return 0; |
8634 | } |
8635 | |
8636 | void l2cap_exit(void) |
8637 | { |
8638 | debugfs_remove(dentry: l2cap_debugfs); |
8639 | hci_unregister_cb(hcb: &l2cap_cb); |
8640 | l2cap_cleanup_sockets(); |
8641 | } |
8642 | |
8643 | module_param(disable_ertm, bool, 0644); |
8644 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode" ); |
8645 | |
8646 | module_param(enable_ecred, bool, 0644); |
8647 | MODULE_PARM_DESC(enable_ecred, "Enable enhanced credit flow control mode" ); |
8648 | |