Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
590051de | 6 | Copyright (C) 2011 ProFUSION Embedded Systems |
422e925b | 7 | Copyright (c) 2012 Code Aurora Forum. All rights reserved. |
1da177e4 LT |
8 | |
9 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License version 2 as | |
13 | published by the Free Software Foundation; | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
16 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
18 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
19 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
20 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
21 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
22 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
23 | ||
8e87d142 YH |
24 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
25 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
26 | SOFTWARE IS DISCLAIMED. |
27 | */ | |
28 | ||
bb58f747 | 29 | /* Bluetooth L2CAP core. */ |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
33 | #include <linux/types.h> | |
4fc268d2 | 34 | #include <linux/capability.h> |
1da177e4 LT |
35 | #include <linux/errno.h> |
36 | #include <linux/kernel.h> | |
1da177e4 LT |
37 | #include <linux/sched.h> |
38 | #include <linux/slab.h> | |
39 | #include <linux/poll.h> | |
40 | #include <linux/fcntl.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/interrupt.h> | |
43 | #include <linux/socket.h> | |
44 | #include <linux/skbuff.h> | |
1da177e4 | 45 | #include <linux/list.h> |
be9d1227 | 46 | #include <linux/device.h> |
aef7d97c MH |
47 | #include <linux/debugfs.h> |
48 | #include <linux/seq_file.h> | |
af05b30b | 49 | #include <linux/uaccess.h> |
fcc203c3 | 50 | #include <linux/crc16.h> |
1da177e4 LT |
51 | #include <net/sock.h> |
52 | ||
1da177e4 LT |
53 | #include <asm/unaligned.h> |
54 | ||
55 | #include <net/bluetooth/bluetooth.h> | |
56 | #include <net/bluetooth/hci_core.h> | |
57 | #include <net/bluetooth/l2cap.h> | |
b501d6a1 | 58 | #include <net/bluetooth/smp.h> |
1da177e4 | 59 | |
eb939922 | 60 | bool disable_ertm; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
50a147cd | 63 | static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, }; |
1da177e4 | 64 | |
b5ad8b7f JB |
65 | static LIST_HEAD(chan_list); |
66 | static DEFINE_RWLOCK(chan_list_lock); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
69 | u8 code, u8 ident, u16 dlen, void *data); | |
4519de9a GP |
70 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, |
71 | void *data); | |
710f9b0a | 72 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
4519de9a GP |
73 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, |
74 | struct l2cap_chan *chan, int err); | |
1da177e4 | 75 | |
0139418c | 76 | /* ---- L2CAP channels ---- */ |
71ba0e56 | 77 | |
baa7e1fa | 78 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 79 | { |
3df91ea2 | 80 | struct l2cap_chan *c; |
3d57dc68 | 81 | |
3df91ea2 AE |
82 | list_for_each_entry(c, &conn->chan_l, list) { |
83 | if (c->dcid == cid) | |
84 | return c; | |
0139418c | 85 | } |
3df91ea2 | 86 | return NULL; |
0139418c MH |
87 | } |
88 | ||
baa7e1fa | 89 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 90 | { |
3df91ea2 | 91 | struct l2cap_chan *c; |
3d57dc68 | 92 | |
3df91ea2 AE |
93 | list_for_each_entry(c, &conn->chan_l, list) { |
94 | if (c->scid == cid) | |
95 | return c; | |
0139418c | 96 | } |
3df91ea2 | 97 | return NULL; |
0139418c MH |
98 | } |
99 | ||
100 | /* Find channel with given SCID. | |
101 | * Returns locked socket */ | |
baa7e1fa | 102 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 103 | { |
48454079 | 104 | struct l2cap_chan *c; |
baa7e1fa | 105 | |
3df91ea2 | 106 | mutex_lock(&conn->chan_lock); |
baa7e1fa | 107 | c = __l2cap_get_chan_by_scid(conn, cid); |
3df91ea2 AE |
108 | mutex_unlock(&conn->chan_lock); |
109 | ||
48454079 | 110 | return c; |
0139418c MH |
111 | } |
112 | ||
baa7e1fa | 113 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 114 | { |
3df91ea2 | 115 | struct l2cap_chan *c; |
3d57dc68 | 116 | |
3df91ea2 AE |
117 | list_for_each_entry(c, &conn->chan_l, list) { |
118 | if (c->ident == ident) | |
119 | return c; | |
0139418c | 120 | } |
3df91ea2 | 121 | return NULL; |
0139418c MH |
122 | } |
123 | ||
23691d75 | 124 | static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src) |
9e4425ff | 125 | { |
23691d75 | 126 | struct l2cap_chan *c; |
9e4425ff | 127 | |
23691d75 GP |
128 | list_for_each_entry(c, &chan_list, global_l) { |
129 | if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src)) | |
250938cb | 130 | return c; |
9e4425ff | 131 | } |
250938cb | 132 | return NULL; |
9e4425ff GP |
133 | } |
134 | ||
135 | int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm) | |
136 | { | |
73b2ec18 GP |
137 | int err; |
138 | ||
333055f2 | 139 | write_lock(&chan_list_lock); |
9e4425ff | 140 | |
23691d75 | 141 | if (psm && __l2cap_global_chan_by_addr(psm, src)) { |
73b2ec18 GP |
142 | err = -EADDRINUSE; |
143 | goto done; | |
9e4425ff GP |
144 | } |
145 | ||
73b2ec18 GP |
146 | if (psm) { |
147 | chan->psm = psm; | |
148 | chan->sport = psm; | |
149 | err = 0; | |
150 | } else { | |
151 | u16 p; | |
152 | ||
153 | err = -EINVAL; | |
154 | for (p = 0x1001; p < 0x1100; p += 2) | |
23691d75 | 155 | if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) { |
73b2ec18 GP |
156 | chan->psm = cpu_to_le16(p); |
157 | chan->sport = cpu_to_le16(p); | |
158 | err = 0; | |
159 | break; | |
160 | } | |
161 | } | |
9e4425ff | 162 | |
73b2ec18 | 163 | done: |
333055f2 | 164 | write_unlock(&chan_list_lock); |
73b2ec18 | 165 | return err; |
9e4425ff GP |
166 | } |
167 | ||
168 | int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid) | |
169 | { | |
333055f2 | 170 | write_lock(&chan_list_lock); |
9e4425ff GP |
171 | |
172 | chan->scid = scid; | |
173 | ||
333055f2 | 174 | write_unlock(&chan_list_lock); |
9e4425ff GP |
175 | |
176 | return 0; | |
177 | } | |
178 | ||
baa7e1fa | 179 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 180 | { |
8db4dc46 | 181 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 182 | |
8db4dc46 | 183 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 184 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
185 | return cid; |
186 | } | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
0e587be7 | 191 | static void __l2cap_state_change(struct l2cap_chan *chan, int state) |
89bc500e | 192 | { |
42d2d87c | 193 | BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state), |
badaaa00 GP |
194 | state_to_string(state)); |
195 | ||
89bc500e GP |
196 | chan->state = state; |
197 | chan->ops->state_change(chan->data, state); | |
198 | } | |
199 | ||
0e587be7 AE |
200 | static void l2cap_state_change(struct l2cap_chan *chan, int state) |
201 | { | |
202 | struct sock *sk = chan->sk; | |
203 | ||
204 | lock_sock(sk); | |
205 | __l2cap_state_change(chan, state); | |
206 | release_sock(sk); | |
207 | } | |
208 | ||
2e0052e4 AE |
209 | static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err) |
210 | { | |
211 | struct sock *sk = chan->sk; | |
212 | ||
213 | sk->sk_err = err; | |
214 | } | |
215 | ||
216 | static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err) | |
217 | { | |
218 | struct sock *sk = chan->sk; | |
219 | ||
220 | lock_sock(sk); | |
221 | __l2cap_chan_set_err(chan, err); | |
222 | release_sock(sk); | |
223 | } | |
224 | ||
3c588192 MM |
225 | /* ---- L2CAP sequence number lists ---- */ |
226 | ||
227 | /* For ERTM, ordered lists of sequence numbers must be tracked for | |
228 | * SREJ requests that are received and for frames that are to be | |
229 | * retransmitted. These seq_list functions implement a singly-linked | |
230 | * list in an array, where membership in the list can also be checked | |
231 | * in constant time. Items can also be added to the tail of the list | |
232 | * and removed from the head in constant time, without further memory | |
233 | * allocs or frees. | |
234 | */ | |
235 | ||
236 | static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size) | |
237 | { | |
238 | size_t alloc_size, i; | |
239 | ||
240 | /* Allocated size is a power of 2 to map sequence numbers | |
241 | * (which may be up to 14 bits) in to a smaller array that is | |
242 | * sized for the negotiated ERTM transmit windows. | |
243 | */ | |
244 | alloc_size = roundup_pow_of_two(size); | |
245 | ||
246 | seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL); | |
247 | if (!seq_list->list) | |
248 | return -ENOMEM; | |
249 | ||
250 | seq_list->mask = alloc_size - 1; | |
251 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
252 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
253 | for (i = 0; i < alloc_size; i++) | |
254 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list) | |
260 | { | |
261 | kfree(seq_list->list); | |
262 | } | |
263 | ||
264 | static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list, | |
265 | u16 seq) | |
266 | { | |
267 | /* Constant-time check for list membership */ | |
268 | return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR; | |
269 | } | |
270 | ||
271 | static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq) | |
272 | { | |
273 | u16 mask = seq_list->mask; | |
274 | ||
275 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) { | |
276 | /* In case someone tries to pop the head of an empty list */ | |
277 | return L2CAP_SEQ_LIST_CLEAR; | |
278 | } else if (seq_list->head == seq) { | |
279 | /* Head can be removed in constant time */ | |
280 | seq_list->head = seq_list->list[seq & mask]; | |
281 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
282 | ||
283 | if (seq_list->head == L2CAP_SEQ_LIST_TAIL) { | |
284 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
285 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
286 | } | |
287 | } else { | |
288 | /* Walk the list to find the sequence number */ | |
289 | u16 prev = seq_list->head; | |
290 | while (seq_list->list[prev & mask] != seq) { | |
291 | prev = seq_list->list[prev & mask]; | |
292 | if (prev == L2CAP_SEQ_LIST_TAIL) | |
293 | return L2CAP_SEQ_LIST_CLEAR; | |
294 | } | |
295 | ||
296 | /* Unlink the number from the list and clear it */ | |
297 | seq_list->list[prev & mask] = seq_list->list[seq & mask]; | |
298 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR; | |
299 | if (seq_list->tail == seq) | |
300 | seq_list->tail = prev; | |
301 | } | |
302 | return seq; | |
303 | } | |
304 | ||
305 | static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list) | |
306 | { | |
307 | /* Remove the head in constant time */ | |
308 | return l2cap_seq_list_remove(seq_list, seq_list->head); | |
309 | } | |
310 | ||
311 | static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list) | |
312 | { | |
f522ae36 | 313 | u16 i; |
3c588192 | 314 | |
f522ae36 GP |
315 | if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) |
316 | return; | |
317 | ||
318 | for (i = 0; i <= seq_list->mask; i++) | |
319 | seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR; | |
320 | ||
321 | seq_list->head = L2CAP_SEQ_LIST_CLEAR; | |
322 | seq_list->tail = L2CAP_SEQ_LIST_CLEAR; | |
3c588192 MM |
323 | } |
324 | ||
325 | static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq) | |
326 | { | |
327 | u16 mask = seq_list->mask; | |
328 | ||
329 | /* All appends happen in constant time */ | |
330 | ||
f522ae36 GP |
331 | if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR) |
332 | return; | |
3c588192 | 333 | |
f522ae36 GP |
334 | if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR) |
335 | seq_list->head = seq; | |
336 | else | |
337 | seq_list->list[seq_list->tail & mask] = seq; | |
338 | ||
339 | seq_list->tail = seq; | |
340 | seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL; | |
3c588192 MM |
341 | } |
342 | ||
721c4181 | 343 | static void l2cap_chan_timeout(struct work_struct *work) |
ab07801d | 344 | { |
721c4181 GP |
345 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
346 | chan_timer.work); | |
3df91ea2 | 347 | struct l2cap_conn *conn = chan->conn; |
ab07801d GP |
348 | int reason; |
349 | ||
e05dcc32 | 350 | BT_DBG("chan %p state %s", chan, state_to_string(chan->state)); |
ab07801d | 351 | |
3df91ea2 | 352 | mutex_lock(&conn->chan_lock); |
6be36555 | 353 | l2cap_chan_lock(chan); |
ab07801d | 354 | |
89bc500e | 355 | if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG) |
ab07801d | 356 | reason = ECONNREFUSED; |
89bc500e | 357 | else if (chan->state == BT_CONNECT && |
ab07801d GP |
358 | chan->sec_level != BT_SECURITY_SDP) |
359 | reason = ECONNREFUSED; | |
360 | else | |
361 | reason = ETIMEDOUT; | |
362 | ||
0f852724 | 363 | l2cap_chan_close(chan, reason); |
ab07801d | 364 | |
6be36555 | 365 | l2cap_chan_unlock(chan); |
ab07801d | 366 | |
ba3bd0ee | 367 | chan->ops->close(chan->data); |
3df91ea2 AE |
368 | mutex_unlock(&conn->chan_lock); |
369 | ||
371fd835 | 370 | l2cap_chan_put(chan); |
ab07801d GP |
371 | } |
372 | ||
eef1d9b6 | 373 | struct l2cap_chan *l2cap_chan_create(void) |
48454079 GP |
374 | { |
375 | struct l2cap_chan *chan; | |
376 | ||
377 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
378 | if (!chan) | |
379 | return NULL; | |
380 | ||
c03b355e AE |
381 | mutex_init(&chan->lock); |
382 | ||
333055f2 | 383 | write_lock(&chan_list_lock); |
23691d75 | 384 | list_add(&chan->global_l, &chan_list); |
333055f2 | 385 | write_unlock(&chan_list_lock); |
23691d75 | 386 | |
721c4181 | 387 | INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout); |
ab07801d | 388 | |
89bc500e GP |
389 | chan->state = BT_OPEN; |
390 | ||
71ba0e56 GP |
391 | atomic_set(&chan->refcnt, 1); |
392 | ||
eef1d9b6 | 393 | BT_DBG("chan %p", chan); |
abc545b8 | 394 | |
48454079 GP |
395 | return chan; |
396 | } | |
397 | ||
23691d75 | 398 | void l2cap_chan_destroy(struct l2cap_chan *chan) |
6ff5abbf | 399 | { |
333055f2 | 400 | write_lock(&chan_list_lock); |
23691d75 | 401 | list_del(&chan->global_l); |
333055f2 | 402 | write_unlock(&chan_list_lock); |
23691d75 | 403 | |
371fd835 | 404 | l2cap_chan_put(chan); |
6ff5abbf GP |
405 | } |
406 | ||
bd4b1653 AE |
407 | void l2cap_chan_set_defaults(struct l2cap_chan *chan) |
408 | { | |
409 | chan->fcs = L2CAP_FCS_CRC16; | |
410 | chan->max_tx = L2CAP_DEFAULT_MAX_TX; | |
411 | chan->tx_win = L2CAP_DEFAULT_TX_WINDOW; | |
412 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; | |
413 | chan->sec_level = BT_SECURITY_LOW; | |
414 | ||
415 | set_bit(FLAG_FORCE_ACTIVE, &chan->flags); | |
416 | } | |
417 | ||
14a28491 | 418 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 419 | { |
af05b30b | 420 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
097db76c | 421 | __le16_to_cpu(chan->psm), chan->dcid); |
0139418c | 422 | |
9f5a0d7b | 423 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 424 | |
8c1d787b | 425 | chan->conn = conn; |
0139418c | 426 | |
5491120e AE |
427 | switch (chan->chan_type) { |
428 | case L2CAP_CHAN_CONN_ORIENTED: | |
b62f328b VT |
429 | if (conn->hcon->type == LE_LINK) { |
430 | /* LE connection */ | |
0c1bc5c6 | 431 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
fe4128e0 GP |
432 | chan->scid = L2CAP_CID_LE_DATA; |
433 | chan->dcid = L2CAP_CID_LE_DATA; | |
b62f328b VT |
434 | } else { |
435 | /* Alloc CID for connection-oriented socket */ | |
fe4128e0 | 436 | chan->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 437 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 438 | } |
5491120e AE |
439 | break; |
440 | ||
441 | case L2CAP_CHAN_CONN_LESS: | |
0139418c | 442 | /* Connectionless socket */ |
fe4128e0 GP |
443 | chan->scid = L2CAP_CID_CONN_LESS; |
444 | chan->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 445 | chan->omtu = L2CAP_DEFAULT_MTU; |
5491120e AE |
446 | break; |
447 | ||
448 | default: | |
0139418c | 449 | /* Raw socket can send/recv signalling messages only */ |
fe4128e0 GP |
450 | chan->scid = L2CAP_CID_SIGNALING; |
451 | chan->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 452 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
453 | } |
454 | ||
8f7975b1 AE |
455 | chan->local_id = L2CAP_BESTEFFORT_ID; |
456 | chan->local_stype = L2CAP_SERV_BESTEFFORT; | |
457 | chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE; | |
458 | chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME; | |
459 | chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT; | |
460 | chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO; | |
461 | ||
371fd835 | 462 | l2cap_chan_hold(chan); |
baa7e1fa | 463 | |
3df91ea2 | 464 | list_add(&chan->list, &conn->chan_l); |
643162a8 AE |
465 | } |
466 | ||
14a28491 | 467 | static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
643162a8 AE |
468 | { |
469 | mutex_lock(&conn->chan_lock); | |
470 | __l2cap_chan_add(conn, chan); | |
3df91ea2 | 471 | mutex_unlock(&conn->chan_lock); |
0139418c MH |
472 | } |
473 | ||
4519de9a | 474 | static void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 475 | { |
48454079 | 476 | struct sock *sk = chan->sk; |
8c1d787b | 477 | struct l2cap_conn *conn = chan->conn; |
0139418c MH |
478 | struct sock *parent = bt_sk(sk)->parent; |
479 | ||
c9b66675 | 480 | __clear_chan_timer(chan); |
0139418c | 481 | |
49208c9c | 482 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 483 | |
8e87d142 | 484 | if (conn) { |
baa7e1fa | 485 | /* Delete from channel list */ |
3df91ea2 | 486 | list_del(&chan->list); |
3d57dc68 | 487 | |
371fd835 | 488 | l2cap_chan_put(chan); |
baa7e1fa | 489 | |
8c1d787b | 490 | chan->conn = NULL; |
0139418c MH |
491 | hci_conn_put(conn->hcon); |
492 | } | |
493 | ||
6be36555 AE |
494 | lock_sock(sk); |
495 | ||
0e587be7 | 496 | __l2cap_state_change(chan, BT_CLOSED); |
0139418c MH |
497 | sock_set_flag(sk, SOCK_ZAPPED); |
498 | ||
499 | if (err) | |
2e0052e4 | 500 | __l2cap_chan_set_err(chan, err); |
0139418c MH |
501 | |
502 | if (parent) { | |
503 | bt_accept_unlink(sk); | |
504 | parent->sk_data_ready(parent, 0); | |
505 | } else | |
506 | sk->sk_state_change(sk); | |
c13ffa62 | 507 | |
6be36555 AE |
508 | release_sock(sk); |
509 | ||
c1360a1c GP |
510 | if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) && |
511 | test_bit(CONF_INPUT_DONE, &chan->conf_state))) | |
6ff5abbf | 512 | return; |
2ead70b8 | 513 | |
58d35f87 | 514 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 515 | |
0c1bc5c6 | 516 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
517 | struct srej_list *l, *tmp; |
518 | ||
1a09bcb9 GP |
519 | __clear_retrans_timer(chan); |
520 | __clear_monitor_timer(chan); | |
521 | __clear_ack_timer(chan); | |
c13ffa62 | 522 | |
f1c6775b | 523 | skb_queue_purge(&chan->srej_q); |
c13ffa62 | 524 | |
3c588192 MM |
525 | l2cap_seq_list_free(&chan->srej_list); |
526 | l2cap_seq_list_free(&chan->retrans_list); | |
39d5a3ee | 527 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
528 | list_del(&l->list); |
529 | kfree(l); | |
530 | } | |
531 | } | |
0139418c MH |
532 | } |
533 | ||
4519de9a GP |
534 | static void l2cap_chan_cleanup_listen(struct sock *parent) |
535 | { | |
536 | struct sock *sk; | |
537 | ||
538 | BT_DBG("parent %p", parent); | |
539 | ||
540 | /* Close not yet accepted channels */ | |
0f852724 | 541 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
ba3bd0ee | 542 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3df91ea2 | 543 | |
6be36555 | 544 | l2cap_chan_lock(chan); |
c9b66675 | 545 | __clear_chan_timer(chan); |
ba3bd0ee | 546 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 547 | l2cap_chan_unlock(chan); |
3df91ea2 | 548 | |
ba3bd0ee | 549 | chan->ops->close(chan->data); |
0f852724 | 550 | } |
4519de9a GP |
551 | } |
552 | ||
0f852724 | 553 | void l2cap_chan_close(struct l2cap_chan *chan, int reason) |
4519de9a GP |
554 | { |
555 | struct l2cap_conn *conn = chan->conn; | |
556 | struct sock *sk = chan->sk; | |
557 | ||
e05dcc32 AE |
558 | BT_DBG("chan %p state %s sk %p", chan, |
559 | state_to_string(chan->state), sk); | |
4519de9a | 560 | |
89bc500e | 561 | switch (chan->state) { |
4519de9a | 562 | case BT_LISTEN: |
6be36555 | 563 | lock_sock(sk); |
4519de9a | 564 | l2cap_chan_cleanup_listen(sk); |
89bc500e | 565 | |
0e587be7 | 566 | __l2cap_state_change(chan, BT_CLOSED); |
89bc500e | 567 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 568 | release_sock(sk); |
4519de9a GP |
569 | break; |
570 | ||
571 | case BT_CONNECTED: | |
572 | case BT_CONFIG: | |
715ec005 | 573 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a | 574 | conn->hcon->type == ACL_LINK) { |
c9b66675 | 575 | __set_chan_timer(chan, sk->sk_sndtimeo); |
4519de9a GP |
576 | l2cap_send_disconn_req(conn, chan, reason); |
577 | } else | |
578 | l2cap_chan_del(chan, reason); | |
579 | break; | |
580 | ||
581 | case BT_CONNECT2: | |
715ec005 | 582 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && |
4519de9a GP |
583 | conn->hcon->type == ACL_LINK) { |
584 | struct l2cap_conn_rsp rsp; | |
585 | __u16 result; | |
586 | ||
587 | if (bt_sk(sk)->defer_setup) | |
588 | result = L2CAP_CR_SEC_BLOCK; | |
589 | else | |
590 | result = L2CAP_CR_BAD_PSM; | |
89bc500e | 591 | l2cap_state_change(chan, BT_DISCONN); |
4519de9a GP |
592 | |
593 | rsp.scid = cpu_to_le16(chan->dcid); | |
594 | rsp.dcid = cpu_to_le16(chan->scid); | |
595 | rsp.result = cpu_to_le16(result); | |
596 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
597 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, | |
598 | sizeof(rsp), &rsp); | |
599 | } | |
600 | ||
601 | l2cap_chan_del(chan, reason); | |
602 | break; | |
603 | ||
604 | case BT_CONNECT: | |
605 | case BT_DISCONN: | |
606 | l2cap_chan_del(chan, reason); | |
607 | break; | |
608 | ||
609 | default: | |
6be36555 | 610 | lock_sock(sk); |
4519de9a | 611 | sock_set_flag(sk, SOCK_ZAPPED); |
6be36555 | 612 | release_sock(sk); |
4519de9a GP |
613 | break; |
614 | } | |
615 | } | |
616 | ||
4343478f | 617 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 618 | { |
715ec005 | 619 | if (chan->chan_type == L2CAP_CHAN_RAW) { |
4343478f | 620 | switch (chan->sec_level) { |
8556edd3 JH |
621 | case BT_SECURITY_HIGH: |
622 | return HCI_AT_DEDICATED_BONDING_MITM; | |
623 | case BT_SECURITY_MEDIUM: | |
624 | return HCI_AT_DEDICATED_BONDING; | |
625 | default: | |
626 | return HCI_AT_NO_BONDING; | |
627 | } | |
fe4128e0 | 628 | } else if (chan->psm == cpu_to_le16(0x0001)) { |
4343478f GP |
629 | if (chan->sec_level == BT_SECURITY_LOW) |
630 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 631 | |
4343478f | 632 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 633 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 634 | else |
8556edd3 | 635 | return HCI_AT_NO_BONDING; |
00ae4af9 | 636 | } else { |
4343478f | 637 | switch (chan->sec_level) { |
00ae4af9 | 638 | case BT_SECURITY_HIGH: |
8556edd3 | 639 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 640 | case BT_SECURITY_MEDIUM: |
8556edd3 | 641 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 642 | default: |
8556edd3 | 643 | return HCI_AT_NO_BONDING; |
00ae4af9 | 644 | } |
0684e5f9 | 645 | } |
8556edd3 JH |
646 | } |
647 | ||
648 | /* Service level security */ | |
d45fc423 | 649 | int l2cap_chan_check_security(struct l2cap_chan *chan) |
8556edd3 | 650 | { |
8c1d787b | 651 | struct l2cap_conn *conn = chan->conn; |
8556edd3 JH |
652 | __u8 auth_type; |
653 | ||
4343478f | 654 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 655 | |
4343478f | 656 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
657 | } |
658 | ||
b5ad8b7f | 659 | static u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
660 | { |
661 | u8 id; | |
662 | ||
663 | /* Get next available identificator. | |
664 | * 1 - 128 are used by kernel. | |
665 | * 129 - 199 are reserved. | |
666 | * 200 - 254 are used by utilities like l2ping, etc. | |
667 | */ | |
668 | ||
333055f2 | 669 | spin_lock(&conn->lock); |
4e8402a3 MH |
670 | |
671 | if (++conn->tx_ident > 128) | |
672 | conn->tx_ident = 1; | |
673 | ||
674 | id = conn->tx_ident; | |
675 | ||
333055f2 | 676 | spin_unlock(&conn->lock); |
4e8402a3 MH |
677 | |
678 | return id; | |
679 | } | |
680 | ||
4519de9a | 681 | static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
682 | { |
683 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 684 | u8 flags; |
4e8402a3 MH |
685 | |
686 | BT_DBG("code 0x%2.2x", code); | |
687 | ||
688 | if (!skb) | |
9a9c6a34 | 689 | return; |
4e8402a3 | 690 | |
e702112f AE |
691 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
692 | flags = ACL_START_NO_FLUSH; | |
693 | else | |
694 | flags = ACL_START; | |
695 | ||
14b12d0b | 696 | bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON; |
5e59b791 | 697 | skb->priority = HCI_PRIO_MAX; |
14b12d0b | 698 | |
73d80deb LAD |
699 | hci_send_acl(conn->hchan, skb, flags); |
700 | } | |
701 | ||
702 | static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) | |
703 | { | |
704 | struct hci_conn *hcon = chan->conn->hcon; | |
705 | u16 flags; | |
706 | ||
707 | BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len, | |
708 | skb->priority); | |
709 | ||
710 | if (!test_bit(FLAG_FLUSHABLE, &chan->flags) && | |
711 | lmp_no_flush_capable(hcon->hdev)) | |
712 | flags = ACL_START_NO_FLUSH; | |
713 | else | |
714 | flags = ACL_START; | |
14b12d0b | 715 | |
73d80deb LAD |
716 | bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
717 | hci_send_acl(chan->conn->hchan, skb, flags); | |
4e8402a3 MH |
718 | } |
719 | ||
b76bbd66 MM |
720 | static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control) |
721 | { | |
722 | control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT; | |
723 | control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT; | |
724 | ||
725 | if (enh & L2CAP_CTRL_FRAME_TYPE) { | |
726 | /* S-Frame */ | |
727 | control->sframe = 1; | |
728 | control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT; | |
729 | control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT; | |
730 | ||
731 | control->sar = 0; | |
732 | control->txseq = 0; | |
733 | } else { | |
734 | /* I-Frame */ | |
735 | control->sframe = 0; | |
736 | control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT; | |
737 | control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT; | |
738 | ||
739 | control->poll = 0; | |
740 | control->super = 0; | |
741 | } | |
742 | } | |
743 | ||
b76bbd66 MM |
744 | static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control) |
745 | { | |
746 | control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
747 | control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT; | |
748 | ||
749 | if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) { | |
750 | /* S-Frame */ | |
751 | control->sframe = 1; | |
752 | control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT; | |
753 | control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT; | |
754 | ||
755 | control->sar = 0; | |
756 | control->txseq = 0; | |
757 | } else { | |
758 | /* I-Frame */ | |
759 | control->sframe = 0; | |
760 | control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT; | |
761 | control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
762 | ||
763 | control->poll = 0; | |
764 | control->super = 0; | |
765 | } | |
766 | } | |
767 | ||
768 | static inline void __unpack_control(struct l2cap_chan *chan, | |
769 | struct sk_buff *skb) | |
770 | { | |
771 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
772 | __unpack_extended_control(get_unaligned_le32(skb->data), | |
773 | &bt_cb(skb)->control); | |
774 | } else { | |
775 | __unpack_enhanced_control(get_unaligned_le16(skb->data), | |
776 | &bt_cb(skb)->control); | |
777 | } | |
778 | } | |
779 | ||
b5c6aaed MM |
780 | static u32 __pack_extended_control(struct l2cap_ctrl *control) |
781 | { | |
782 | u32 packed; | |
783 | ||
784 | packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT; | |
785 | packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT; | |
786 | ||
787 | if (control->sframe) { | |
788 | packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT; | |
789 | packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT; | |
790 | packed |= L2CAP_EXT_CTRL_FRAME_TYPE; | |
791 | } else { | |
792 | packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT; | |
793 | packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT; | |
794 | } | |
795 | ||
796 | return packed; | |
797 | } | |
798 | ||
799 | static u16 __pack_enhanced_control(struct l2cap_ctrl *control) | |
800 | { | |
801 | u16 packed; | |
802 | ||
803 | packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT; | |
804 | packed |= control->final << L2CAP_CTRL_FINAL_SHIFT; | |
805 | ||
806 | if (control->sframe) { | |
807 | packed |= control->poll << L2CAP_CTRL_POLL_SHIFT; | |
808 | packed |= control->super << L2CAP_CTRL_SUPER_SHIFT; | |
809 | packed |= L2CAP_CTRL_FRAME_TYPE; | |
810 | } else { | |
811 | packed |= control->sar << L2CAP_CTRL_SAR_SHIFT; | |
812 | packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT; | |
813 | } | |
814 | ||
815 | return packed; | |
816 | } | |
817 | ||
b76bbd66 MM |
818 | static inline void __pack_control(struct l2cap_chan *chan, |
819 | struct l2cap_ctrl *control, | |
820 | struct sk_buff *skb) | |
821 | { | |
822 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) { | |
823 | put_unaligned_le32(__pack_extended_control(control), | |
824 | skb->data + L2CAP_HDR_SIZE); | |
825 | } else { | |
826 | put_unaligned_le16(__pack_enhanced_control(control), | |
827 | skb->data + L2CAP_HDR_SIZE); | |
828 | } | |
829 | } | |
830 | ||
b5c6aaed MM |
831 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control) |
832 | { | |
833 | struct sk_buff *skb; | |
834 | struct l2cap_hdr *lh; | |
835 | struct l2cap_conn *conn = chan->conn; | |
836 | int count, hlen; | |
837 | ||
838 | if (chan->state != BT_CONNECTED) | |
839 | return; | |
840 | ||
841 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
842 | hlen = L2CAP_EXT_HDR_SIZE; | |
843 | else | |
844 | hlen = L2CAP_ENH_HDR_SIZE; | |
845 | ||
846 | if (chan->fcs == L2CAP_FCS_CRC16) | |
847 | hlen += L2CAP_FCS_SIZE; | |
848 | ||
849 | BT_DBG("chan %p, control 0x%8.8x", chan, control); | |
850 | ||
851 | count = min_t(unsigned int, conn->mtu, hlen); | |
852 | ||
853 | control |= __set_sframe(chan); | |
854 | ||
855 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) | |
856 | control |= __set_ctrl_final(chan); | |
857 | ||
858 | if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state)) | |
859 | control |= __set_ctrl_poll(chan); | |
860 | ||
861 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
862 | if (!skb) | |
863 | return; | |
864 | ||
865 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
866 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); | |
867 | lh->cid = cpu_to_le16(chan->dcid); | |
868 | ||
869 | __put_control(chan, control, skb_put(skb, __ctrl_size(chan))); | |
870 | ||
871 | if (chan->fcs == L2CAP_FCS_CRC16) { | |
872 | u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE); | |
873 | put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE)); | |
874 | } | |
875 | ||
876 | skb->priority = HCI_PRIO_MAX; | |
877 | l2cap_do_send(chan, skb); | |
878 | } | |
879 | ||
880 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control) | |
881 | { | |
882 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
883 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); | |
884 | set_bit(CONN_RNR_SENT, &chan->conn_state); | |
885 | } else | |
886 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
887 | ||
888 | control |= __set_reqseq(chan, chan->buffer_seq); | |
889 | ||
890 | l2cap_send_sframe(chan, control); | |
891 | } | |
892 | ||
b4450035 | 893 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 894 | { |
c1360a1c | 895 | return !test_bit(CONF_CONNECT_PEND, &chan->conf_state); |
e501d055 AE |
896 | } |
897 | ||
9b27f350 AE |
898 | static void l2cap_send_conn_req(struct l2cap_chan *chan) |
899 | { | |
900 | struct l2cap_conn *conn = chan->conn; | |
901 | struct l2cap_conn_req req; | |
902 | ||
903 | req.scid = cpu_to_le16(chan->scid); | |
904 | req.psm = chan->psm; | |
905 | ||
906 | chan->ident = l2cap_get_ident(conn); | |
907 | ||
908 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); | |
909 | ||
910 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req); | |
911 | } | |
912 | ||
9f0caeb1 VCG |
913 | static void l2cap_chan_ready(struct l2cap_chan *chan) |
914 | { | |
915 | struct sock *sk = chan->sk; | |
916 | struct sock *parent; | |
917 | ||
918 | lock_sock(sk); | |
919 | ||
920 | parent = bt_sk(sk)->parent; | |
921 | ||
922 | BT_DBG("sk %p, parent %p", sk, parent); | |
923 | ||
924 | chan->conf_state = 0; | |
925 | __clear_chan_timer(chan); | |
926 | ||
927 | __l2cap_state_change(chan, BT_CONNECTED); | |
928 | sk->sk_state_change(sk); | |
929 | ||
930 | if (parent) | |
931 | parent->sk_data_ready(parent, 0); | |
932 | ||
933 | release_sock(sk); | |
934 | } | |
935 | ||
fc7f8a7e | 936 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 937 | { |
8c1d787b | 938 | struct l2cap_conn *conn = chan->conn; |
79d554a6 | 939 | |
9f0caeb1 VCG |
940 | if (conn->hcon->type == LE_LINK) { |
941 | l2cap_chan_ready(chan); | |
942 | return; | |
943 | } | |
944 | ||
79d554a6 | 945 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
984947dc MH |
946 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
947 | return; | |
948 | ||
d45fc423 | 949 | if (l2cap_chan_check_security(chan) && |
9b27f350 AE |
950 | __l2cap_no_conn_pending(chan)) |
951 | l2cap_send_conn_req(chan); | |
79d554a6 MH |
952 | } else { |
953 | struct l2cap_info_req req; | |
954 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
955 | ||
956 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
957 | conn->info_ident = l2cap_get_ident(conn); | |
958 | ||
ba13ccd9 | 959 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
960 | |
961 | l2cap_send_cmd(conn, conn->info_ident, | |
962 | L2CAP_INFO_REQ, sizeof(req), &req); | |
963 | } | |
964 | } | |
965 | ||
cf6c2c0b GP |
966 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
967 | { | |
968 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 969 | if (!disable_ertm) |
cf6c2c0b GP |
970 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
971 | ||
972 | switch (mode) { | |
973 | case L2CAP_MODE_ERTM: | |
974 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
975 | case L2CAP_MODE_STREAMING: | |
976 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
977 | default: | |
978 | return 0x00; | |
979 | } | |
980 | } | |
981 | ||
4519de9a | 982 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 983 | { |
6be36555 | 984 | struct sock *sk = chan->sk; |
22121fc9 GP |
985 | struct l2cap_disconn_req req; |
986 | ||
c13ffa62 GP |
987 | if (!conn) |
988 | return; | |
989 | ||
0c1bc5c6 | 990 | if (chan->mode == L2CAP_MODE_ERTM) { |
1a09bcb9 GP |
991 | __clear_retrans_timer(chan); |
992 | __clear_monitor_timer(chan); | |
993 | __clear_ack_timer(chan); | |
c13ffa62 GP |
994 | } |
995 | ||
fe4128e0 GP |
996 | req.dcid = cpu_to_le16(chan->dcid); |
997 | req.scid = cpu_to_le16(chan->scid); | |
22121fc9 GP |
998 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
999 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 | 1000 | |
6be36555 | 1001 | lock_sock(sk); |
0e587be7 | 1002 | __l2cap_state_change(chan, BT_DISCONN); |
2e0052e4 | 1003 | __l2cap_chan_set_err(chan, err); |
6be36555 | 1004 | release_sock(sk); |
22121fc9 GP |
1005 | } |
1006 | ||
1da177e4 | 1007 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
1008 | static void l2cap_conn_start(struct l2cap_conn *conn) |
1009 | { | |
3df91ea2 | 1010 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
1011 | |
1012 | BT_DBG("conn %p", conn); | |
1013 | ||
3df91ea2 | 1014 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1015 | |
3df91ea2 | 1016 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 1017 | struct sock *sk = chan->sk; |
baa7e1fa | 1018 | |
6be36555 | 1019 | l2cap_chan_lock(chan); |
4e8402a3 | 1020 | |
715ec005 | 1021 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1022 | l2cap_chan_unlock(chan); |
79d554a6 MH |
1023 | continue; |
1024 | } | |
1025 | ||
89bc500e | 1026 | if (chan->state == BT_CONNECT) { |
d45fc423 | 1027 | if (!l2cap_chan_check_security(chan) || |
b4450035 | 1028 | !__l2cap_no_conn_pending(chan)) { |
6be36555 | 1029 | l2cap_chan_unlock(chan); |
47731de7 GP |
1030 | continue; |
1031 | } | |
79d554a6 | 1032 | |
c1360a1c GP |
1033 | if (!l2cap_mode_supported(chan->mode, conn->feat_mask) |
1034 | && test_bit(CONF_STATE2_DEVICE, | |
1035 | &chan->conf_state)) { | |
89bc500e | 1036 | l2cap_chan_close(chan, ECONNRESET); |
6be36555 | 1037 | l2cap_chan_unlock(chan); |
47731de7 | 1038 | continue; |
b1235d79 | 1039 | } |
47731de7 | 1040 | |
9b27f350 | 1041 | l2cap_send_conn_req(chan); |
47731de7 | 1042 | |
89bc500e | 1043 | } else if (chan->state == BT_CONNECT2) { |
79d554a6 | 1044 | struct l2cap_conn_rsp rsp; |
e9aeb2dd | 1045 | char buf[128]; |
fe4128e0 GP |
1046 | rsp.scid = cpu_to_le16(chan->dcid); |
1047 | rsp.dcid = cpu_to_le16(chan->scid); | |
79d554a6 | 1048 | |
d45fc423 | 1049 | if (l2cap_chan_check_security(chan)) { |
6be36555 | 1050 | lock_sock(sk); |
f66dc81f MH |
1051 | if (bt_sk(sk)->defer_setup) { |
1052 | struct sock *parent = bt_sk(sk)->parent; | |
1053 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1054 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
05e9a2f6 IK |
1055 | if (parent) |
1056 | parent->sk_data_ready(parent, 0); | |
f66dc81f MH |
1057 | |
1058 | } else { | |
0e587be7 | 1059 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
1060 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1061 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1062 | } | |
6be36555 | 1063 | release_sock(sk); |
79d554a6 MH |
1064 | } else { |
1065 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
1066 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
1067 | } | |
1068 | ||
fc7f8a7e GP |
1069 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
1070 | sizeof(rsp), &rsp); | |
e9aeb2dd | 1071 | |
c1360a1c | 1072 | if (test_bit(CONF_REQ_SENT, &chan->conf_state) || |
e9aeb2dd | 1073 | rsp.result != L2CAP_CR_SUCCESS) { |
6be36555 | 1074 | l2cap_chan_unlock(chan); |
e9aeb2dd GP |
1075 | continue; |
1076 | } | |
1077 | ||
c1360a1c | 1078 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 1079 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
1080 | l2cap_build_conf_req(chan, buf), buf); |
1081 | chan->num_conf_req++; | |
4e8402a3 MH |
1082 | } |
1083 | ||
6be36555 | 1084 | l2cap_chan_unlock(chan); |
4e8402a3 MH |
1085 | } |
1086 | ||
3df91ea2 | 1087 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1088 | } |
1089 | ||
c2287681 | 1090 | /* Find socket with cid and source/destination bdaddr. |
b62f328b VT |
1091 | * Returns closest match, locked. |
1092 | */ | |
d9b88702 | 1093 | static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, |
c2287681 IY |
1094 | bdaddr_t *src, |
1095 | bdaddr_t *dst) | |
b62f328b | 1096 | { |
23691d75 | 1097 | struct l2cap_chan *c, *c1 = NULL; |
b62f328b | 1098 | |
23691d75 | 1099 | read_lock(&chan_list_lock); |
b62f328b | 1100 | |
23691d75 GP |
1101 | list_for_each_entry(c, &chan_list, global_l) { |
1102 | struct sock *sk = c->sk; | |
fe4128e0 | 1103 | |
89bc500e | 1104 | if (state && c->state != state) |
b62f328b VT |
1105 | continue; |
1106 | ||
23691d75 | 1107 | if (c->scid == cid) { |
c2287681 IY |
1108 | int src_match, dst_match; |
1109 | int src_any, dst_any; | |
1110 | ||
b62f328b | 1111 | /* Exact match. */ |
c2287681 IY |
1112 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1113 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1114 | if (src_match && dst_match) { | |
23691d75 GP |
1115 | read_unlock(&chan_list_lock); |
1116 | return c; | |
1117 | } | |
b62f328b VT |
1118 | |
1119 | /* Closest match */ | |
c2287681 IY |
1120 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1121 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1122 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1123 | (src_any && dst_any)) | |
23691d75 | 1124 | c1 = c; |
b62f328b VT |
1125 | } |
1126 | } | |
280f294f | 1127 | |
23691d75 | 1128 | read_unlock(&chan_list_lock); |
b62f328b | 1129 | |
23691d75 | 1130 | return c1; |
b62f328b VT |
1131 | } |
1132 | ||
1133 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
1134 | { | |
c916fbe4 | 1135 | struct sock *parent, *sk; |
23691d75 | 1136 | struct l2cap_chan *chan, *pchan; |
b62f328b VT |
1137 | |
1138 | BT_DBG(""); | |
1139 | ||
1140 | /* Check if we have socket listening on cid */ | |
23691d75 | 1141 | pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, |
c2287681 | 1142 | conn->src, conn->dst); |
23691d75 | 1143 | if (!pchan) |
b62f328b VT |
1144 | return; |
1145 | ||
23691d75 GP |
1146 | parent = pchan->sk; |
1147 | ||
aa2ac881 | 1148 | lock_sock(parent); |
62f3a2cf | 1149 | |
b62f328b VT |
1150 | /* Check for backlog size */ |
1151 | if (sk_acceptq_is_full(parent)) { | |
1152 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
1153 | goto clean; | |
1154 | } | |
1155 | ||
80808e43 GP |
1156 | chan = pchan->ops->new_connection(pchan->data); |
1157 | if (!chan) | |
b62f328b VT |
1158 | goto clean; |
1159 | ||
80808e43 | 1160 | sk = chan->sk; |
5d41ce1d | 1161 | |
b62f328b VT |
1162 | hci_conn_hold(conn->hcon); |
1163 | ||
b62f328b VT |
1164 | bacpy(&bt_sk(sk)->src, conn->src); |
1165 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1166 | ||
d1010240 GP |
1167 | bt_accept_enqueue(parent, sk); |
1168 | ||
3d57dc68 | 1169 | l2cap_chan_add(conn, chan); |
48454079 | 1170 | |
c9b66675 | 1171 | __set_chan_timer(chan, sk->sk_sndtimeo); |
b62f328b | 1172 | |
0e587be7 | 1173 | __l2cap_state_change(chan, BT_CONNECTED); |
b62f328b VT |
1174 | parent->sk_data_ready(parent, 0); |
1175 | ||
b62f328b | 1176 | clean: |
aa2ac881 | 1177 | release_sock(parent); |
b62f328b VT |
1178 | } |
1179 | ||
4e8402a3 MH |
1180 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
1181 | { | |
48454079 | 1182 | struct l2cap_chan *chan; |
4e8402a3 | 1183 | |
79d554a6 | 1184 | BT_DBG("conn %p", conn); |
4e8402a3 | 1185 | |
b62f328b VT |
1186 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
1187 | l2cap_le_conn_ready(conn); | |
1188 | ||
160dc6ac VCG |
1189 | if (conn->hcon->out && conn->hcon->type == LE_LINK) |
1190 | smp_conn_security(conn, conn->hcon->pending_sec_level); | |
1191 | ||
3df91ea2 | 1192 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1193 | |
3df91ea2 | 1194 | list_for_each_entry(chan, &conn->chan_l, list) { |
baa7e1fa | 1195 | |
6be36555 | 1196 | l2cap_chan_lock(chan); |
4e8402a3 | 1197 | |
63128451 | 1198 | if (conn->hcon->type == LE_LINK) { |
b501d6a1 | 1199 | if (smp_conn_security(conn, chan->sec_level)) |
cf4cd009 | 1200 | l2cap_chan_ready(chan); |
acd7d370 | 1201 | |
63128451 | 1202 | } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
6be36555 | 1203 | struct sock *sk = chan->sk; |
c9b66675 | 1204 | __clear_chan_timer(chan); |
6be36555 | 1205 | lock_sock(sk); |
0e587be7 | 1206 | __l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1207 | sk->sk_state_change(sk); |
6be36555 | 1208 | release_sock(sk); |
b501d6a1 | 1209 | |
89bc500e | 1210 | } else if (chan->state == BT_CONNECT) |
fc7f8a7e | 1211 | l2cap_do_start(chan); |
4e8402a3 | 1212 | |
6be36555 | 1213 | l2cap_chan_unlock(chan); |
4e8402a3 | 1214 | } |
79d554a6 | 1215 | |
3df91ea2 | 1216 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1217 | } |
1218 | ||
1219 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
1220 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
1221 | { | |
48454079 | 1222 | struct l2cap_chan *chan; |
4e8402a3 MH |
1223 | |
1224 | BT_DBG("conn %p", conn); | |
1225 | ||
3df91ea2 | 1226 | mutex_lock(&conn->chan_lock); |
4e8402a3 | 1227 | |
3df91ea2 | 1228 | list_for_each_entry(chan, &conn->chan_l, list) { |
ecf61bdb | 1229 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
2e0052e4 | 1230 | __l2cap_chan_set_err(chan, err); |
4e8402a3 MH |
1231 | } |
1232 | ||
3df91ea2 | 1233 | mutex_unlock(&conn->chan_lock); |
4e8402a3 MH |
1234 | } |
1235 | ||
f878fcad | 1236 | static void l2cap_info_timeout(struct work_struct *work) |
4e8402a3 | 1237 | { |
f878fcad | 1238 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
030013d8 | 1239 | info_timer.work); |
4e8402a3 | 1240 | |
984947dc | 1241 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 1242 | conn->info_ident = 0; |
984947dc | 1243 | |
4e8402a3 MH |
1244 | l2cap_conn_start(conn); |
1245 | } | |
1246 | ||
5d3de7df VCG |
1247 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1248 | { | |
1249 | struct l2cap_conn *conn = hcon->l2cap_data; | |
1250 | struct l2cap_chan *chan, *l; | |
5d3de7df VCG |
1251 | |
1252 | if (!conn) | |
1253 | return; | |
1254 | ||
1255 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
1256 | ||
1257 | kfree_skb(conn->rx_skb); | |
1258 | ||
3df91ea2 AE |
1259 | mutex_lock(&conn->chan_lock); |
1260 | ||
5d3de7df VCG |
1261 | /* Kill channels */ |
1262 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { | |
61d6ef3e | 1263 | l2cap_chan_hold(chan); |
6be36555 AE |
1264 | l2cap_chan_lock(chan); |
1265 | ||
5d3de7df | 1266 | l2cap_chan_del(chan, err); |
6be36555 AE |
1267 | |
1268 | l2cap_chan_unlock(chan); | |
1269 | ||
5d3de7df | 1270 | chan->ops->close(chan->data); |
61d6ef3e | 1271 | l2cap_chan_put(chan); |
5d3de7df VCG |
1272 | } |
1273 | ||
3df91ea2 AE |
1274 | mutex_unlock(&conn->chan_lock); |
1275 | ||
73d80deb LAD |
1276 | hci_chan_del(conn->hchan); |
1277 | ||
5d3de7df | 1278 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
127074bf | 1279 | cancel_delayed_work_sync(&conn->info_timer); |
5d3de7df | 1280 | |
51a8efd7 | 1281 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
127074bf | 1282 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1283 | smp_chan_destroy(conn); |
d26a2345 | 1284 | } |
5d3de7df VCG |
1285 | |
1286 | hcon->l2cap_data = NULL; | |
1287 | kfree(conn); | |
1288 | } | |
1289 | ||
6c9d42a1 | 1290 | static void security_timeout(struct work_struct *work) |
5d3de7df | 1291 | { |
6c9d42a1 GP |
1292 | struct l2cap_conn *conn = container_of(work, struct l2cap_conn, |
1293 | security_timer.work); | |
5d3de7df VCG |
1294 | |
1295 | l2cap_conn_del(conn->hcon, ETIMEDOUT); | |
1296 | } | |
1297 | ||
1da177e4 LT |
1298 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
1299 | { | |
0139418c | 1300 | struct l2cap_conn *conn = hcon->l2cap_data; |
73d80deb | 1301 | struct hci_chan *hchan; |
1da177e4 | 1302 | |
0139418c | 1303 | if (conn || status) |
1da177e4 LT |
1304 | return conn; |
1305 | ||
73d80deb LAD |
1306 | hchan = hci_chan_create(hcon); |
1307 | if (!hchan) | |
1308 | return NULL; | |
1309 | ||
0139418c | 1310 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
73d80deb LAD |
1311 | if (!conn) { |
1312 | hci_chan_del(hchan); | |
1da177e4 | 1313 | return NULL; |
73d80deb | 1314 | } |
1da177e4 LT |
1315 | |
1316 | hcon->l2cap_data = conn; | |
1317 | conn->hcon = hcon; | |
73d80deb | 1318 | conn->hchan = hchan; |
1da177e4 | 1319 | |
73d80deb | 1320 | BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan); |
0139418c | 1321 | |
acd7d370 VT |
1322 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
1323 | conn->mtu = hcon->hdev->le_mtu; | |
1324 | else | |
1325 | conn->mtu = hcon->hdev->acl_mtu; | |
1326 | ||
1da177e4 LT |
1327 | conn->src = &hcon->hdev->bdaddr; |
1328 | conn->dst = &hcon->dst; | |
1329 | ||
4e8402a3 MH |
1330 | conn->feat_mask = 0; |
1331 | ||
1da177e4 | 1332 | spin_lock_init(&conn->lock); |
3df91ea2 | 1333 | mutex_init(&conn->chan_lock); |
baa7e1fa GP |
1334 | |
1335 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 1336 | |
5d3de7df | 1337 | if (hcon->type == LE_LINK) |
6c9d42a1 | 1338 | INIT_DELAYED_WORK(&conn->security_timer, security_timeout); |
5d3de7df | 1339 | else |
030013d8 | 1340 | INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout); |
45054dc1 | 1341 | |
9f5a0d7b | 1342 | conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM; |
2950f21a | 1343 | |
1da177e4 LT |
1344 | return conn; |
1345 | } | |
1346 | ||
1da177e4 | 1347 | /* ---- Socket interface ---- */ |
1da177e4 | 1348 | |
c2287681 | 1349 | /* Find socket with psm and source / destination bdaddr. |
1da177e4 LT |
1350 | * Returns closest match. |
1351 | */ | |
c2287681 IY |
1352 | static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, |
1353 | bdaddr_t *src, | |
1354 | bdaddr_t *dst) | |
1da177e4 | 1355 | { |
23691d75 | 1356 | struct l2cap_chan *c, *c1 = NULL; |
1da177e4 | 1357 | |
23691d75 | 1358 | read_lock(&chan_list_lock); |
e0f0cb56 | 1359 | |
23691d75 GP |
1360 | list_for_each_entry(c, &chan_list, global_l) { |
1361 | struct sock *sk = c->sk; | |
fe4128e0 | 1362 | |
89bc500e | 1363 | if (state && c->state != state) |
1da177e4 LT |
1364 | continue; |
1365 | ||
23691d75 | 1366 | if (c->psm == psm) { |
c2287681 IY |
1367 | int src_match, dst_match; |
1368 | int src_any, dst_any; | |
1369 | ||
1da177e4 | 1370 | /* Exact match. */ |
c2287681 IY |
1371 | src_match = !bacmp(&bt_sk(sk)->src, src); |
1372 | dst_match = !bacmp(&bt_sk(sk)->dst, dst); | |
1373 | if (src_match && dst_match) { | |
a7567b20 | 1374 | read_unlock(&chan_list_lock); |
23691d75 GP |
1375 | return c; |
1376 | } | |
1da177e4 LT |
1377 | |
1378 | /* Closest match */ | |
c2287681 IY |
1379 | src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY); |
1380 | dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY); | |
1381 | if ((src_match && dst_any) || (src_any && dst_match) || | |
1382 | (src_any && dst_any)) | |
23691d75 | 1383 | c1 = c; |
1da177e4 LT |
1384 | } |
1385 | } | |
1da177e4 | 1386 | |
23691d75 | 1387 | read_unlock(&chan_list_lock); |
e0f0cb56 | 1388 | |
23691d75 | 1389 | return c1; |
1da177e4 LT |
1390 | } |
1391 | ||
8e9f9892 AG |
1392 | int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, |
1393 | bdaddr_t *dst, u8 dst_type) | |
1da177e4 | 1394 | { |
5d41ce1d | 1395 | struct sock *sk = chan->sk; |
1da177e4 | 1396 | bdaddr_t *src = &bt_sk(sk)->src; |
1da177e4 LT |
1397 | struct l2cap_conn *conn; |
1398 | struct hci_conn *hcon; | |
1399 | struct hci_dev *hdev; | |
09ab6f4c | 1400 | __u8 auth_type; |
44d0e48e | 1401 | int err; |
1da177e4 | 1402 | |
8e9f9892 AG |
1403 | BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst), |
1404 | dst_type, __le16_to_cpu(chan->psm)); | |
1da177e4 | 1405 | |
af05b30b GP |
1406 | hdev = hci_get_route(dst, src); |
1407 | if (!hdev) | |
1da177e4 LT |
1408 | return -EHOSTUNREACH; |
1409 | ||
09fd0de5 | 1410 | hci_dev_lock(hdev); |
1da177e4 | 1411 | |
6be36555 | 1412 | l2cap_chan_lock(chan); |
03a00194 GP |
1413 | |
1414 | /* PSM must be odd and lsb of upper byte must be 0 */ | |
1415 | if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid && | |
1416 | chan->chan_type != L2CAP_CHAN_RAW) { | |
1417 | err = -EINVAL; | |
1418 | goto done; | |
1419 | } | |
1420 | ||
1421 | if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) { | |
1422 | err = -EINVAL; | |
1423 | goto done; | |
1424 | } | |
1425 | ||
1426 | switch (chan->mode) { | |
1427 | case L2CAP_MODE_BASIC: | |
1428 | break; | |
1429 | case L2CAP_MODE_ERTM: | |
1430 | case L2CAP_MODE_STREAMING: | |
1431 | if (!disable_ertm) | |
1432 | break; | |
1433 | /* fall through */ | |
1434 | default: | |
1435 | err = -ENOTSUPP; | |
1436 | goto done; | |
1437 | } | |
1438 | ||
6be36555 AE |
1439 | lock_sock(sk); |
1440 | ||
03a00194 GP |
1441 | switch (sk->sk_state) { |
1442 | case BT_CONNECT: | |
1443 | case BT_CONNECT2: | |
1444 | case BT_CONFIG: | |
1445 | /* Already connecting */ | |
1446 | err = 0; | |
6be36555 | 1447 | release_sock(sk); |
03a00194 GP |
1448 | goto done; |
1449 | ||
1450 | case BT_CONNECTED: | |
1451 | /* Already connected */ | |
1452 | err = -EISCONN; | |
6be36555 | 1453 | release_sock(sk); |
03a00194 GP |
1454 | goto done; |
1455 | ||
1456 | case BT_OPEN: | |
1457 | case BT_BOUND: | |
1458 | /* Can connect */ | |
1459 | break; | |
1460 | ||
1461 | default: | |
1462 | err = -EBADFD; | |
6be36555 | 1463 | release_sock(sk); |
03a00194 GP |
1464 | goto done; |
1465 | } | |
1466 | ||
1467 | /* Set destination address and psm */ | |
9219b2a0 | 1468 | bacpy(&bt_sk(sk)->dst, dst); |
6be36555 AE |
1469 | |
1470 | release_sock(sk); | |
1471 | ||
03a00194 GP |
1472 | chan->psm = psm; |
1473 | chan->dcid = cid; | |
1da177e4 | 1474 | |
4343478f | 1475 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 1476 | |
fe4128e0 | 1477 | if (chan->dcid == L2CAP_CID_LE_DATA) |
8e9f9892 | 1478 | hcon = hci_connect(hdev, LE_LINK, dst, dst_type, |
b12f62cf | 1479 | chan->sec_level, auth_type); |
acd7d370 | 1480 | else |
8e9f9892 | 1481 | hcon = hci_connect(hdev, ACL_LINK, dst, dst_type, |
b12f62cf | 1482 | chan->sec_level, auth_type); |
acd7d370 | 1483 | |
30e76272 VT |
1484 | if (IS_ERR(hcon)) { |
1485 | err = PTR_ERR(hcon); | |
1da177e4 | 1486 | goto done; |
30e76272 | 1487 | } |
1da177e4 LT |
1488 | |
1489 | conn = l2cap_conn_add(hcon, 0); | |
1490 | if (!conn) { | |
1491 | hci_conn_put(hcon); | |
30e76272 | 1492 | err = -ENOMEM; |
1da177e4 LT |
1493 | goto done; |
1494 | } | |
1495 | ||
9f0caeb1 VCG |
1496 | if (hcon->type == LE_LINK) { |
1497 | err = 0; | |
1498 | ||
1499 | if (!list_empty(&conn->chan_l)) { | |
1500 | err = -EBUSY; | |
1501 | hci_conn_put(hcon); | |
1502 | } | |
1503 | ||
1504 | if (err) | |
1505 | goto done; | |
1506 | } | |
1507 | ||
1da177e4 LT |
1508 | /* Update source addr of the socket */ |
1509 | bacpy(src, conn->src); | |
1510 | ||
6be36555 | 1511 | l2cap_chan_unlock(chan); |
48454079 | 1512 | l2cap_chan_add(conn, chan); |
6be36555 | 1513 | l2cap_chan_lock(chan); |
48454079 | 1514 | |
6be36555 | 1515 | l2cap_state_change(chan, BT_CONNECT); |
c9b66675 | 1516 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 LT |
1517 | |
1518 | if (hcon->state == BT_CONNECTED) { | |
715ec005 | 1519 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
c9b66675 | 1520 | __clear_chan_timer(chan); |
d45fc423 | 1521 | if (l2cap_chan_check_security(chan)) |
6be36555 | 1522 | l2cap_state_change(chan, BT_CONNECTED); |
79d554a6 | 1523 | } else |
fc7f8a7e | 1524 | l2cap_do_start(chan); |
1da177e4 LT |
1525 | } |
1526 | ||
30e76272 VT |
1527 | err = 0; |
1528 | ||
1da177e4 | 1529 | done: |
6be36555 | 1530 | l2cap_chan_unlock(chan); |
09fd0de5 | 1531 | hci_dev_unlock(hdev); |
1da177e4 LT |
1532 | hci_dev_put(hdev); |
1533 | return err; | |
1534 | } | |
1535 | ||
dcba0dba | 1536 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 | 1537 | { |
8c1d787b | 1538 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
6161c038 GP |
1539 | DECLARE_WAITQUEUE(wait, current); |
1540 | int err = 0; | |
1541 | int timeo = HZ/5; | |
1542 | ||
2b0b05dd | 1543 | add_wait_queue(sk_sleep(sk), &wait); |
a71a0cf4 PH |
1544 | set_current_state(TASK_INTERRUPTIBLE); |
1545 | while (chan->unacked_frames > 0 && chan->conn) { | |
6161c038 GP |
1546 | if (!timeo) |
1547 | timeo = HZ/5; | |
1548 | ||
1549 | if (signal_pending(current)) { | |
1550 | err = sock_intr_errno(timeo); | |
1551 | break; | |
1552 | } | |
1553 | ||
1554 | release_sock(sk); | |
1555 | timeo = schedule_timeout(timeo); | |
1556 | lock_sock(sk); | |
a71a0cf4 | 1557 | set_current_state(TASK_INTERRUPTIBLE); |
6161c038 GP |
1558 | |
1559 | err = sock_error(sk); | |
1560 | if (err) | |
1561 | break; | |
1562 | } | |
1563 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1564 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1565 | return err; |
1566 | } | |
1567 | ||
721c4181 | 1568 | static void l2cap_monitor_timeout(struct work_struct *work) |
e90bac06 | 1569 | { |
721c4181 GP |
1570 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1571 | monitor_timer.work); | |
e90bac06 | 1572 | |
525cd185 | 1573 | BT_DBG("chan %p", chan); |
0e98958d | 1574 | |
6be36555 AE |
1575 | l2cap_chan_lock(chan); |
1576 | ||
2c03a7a4 | 1577 | if (chan->retry_count >= chan->remote_max_tx) { |
8c1d787b | 1578 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
6be36555 | 1579 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1580 | l2cap_chan_put(chan); |
e90bac06 GP |
1581 | return; |
1582 | } | |
1583 | ||
6a026610 | 1584 | chan->retry_count++; |
1a09bcb9 | 1585 | __set_monitor_timer(chan); |
e90bac06 | 1586 | |
525cd185 | 1587 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 | 1588 | l2cap_chan_unlock(chan); |
8d7e1c7f | 1589 | l2cap_chan_put(chan); |
e90bac06 GP |
1590 | } |
1591 | ||
721c4181 | 1592 | static void l2cap_retrans_timeout(struct work_struct *work) |
e90bac06 | 1593 | { |
721c4181 GP |
1594 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
1595 | retrans_timer.work); | |
e90bac06 | 1596 | |
49208c9c | 1597 | BT_DBG("chan %p", chan); |
0e98958d | 1598 | |
6be36555 AE |
1599 | l2cap_chan_lock(chan); |
1600 | ||
6a026610 | 1601 | chan->retry_count = 1; |
1a09bcb9 | 1602 | __set_monitor_timer(chan); |
e90bac06 | 1603 | |
e2ab4353 | 1604 | set_bit(CONN_WAIT_F, &chan->conn_state); |
e90bac06 | 1605 | |
525cd185 | 1606 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
6be36555 AE |
1607 | |
1608 | l2cap_chan_unlock(chan); | |
8d7e1c7f | 1609 | l2cap_chan_put(chan); |
e90bac06 GP |
1610 | } |
1611 | ||
42e5c802 | 1612 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 1613 | { |
1c2acffb | 1614 | struct sk_buff *skb; |
1da177e4 | 1615 | |
58d35f87 | 1616 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 1617 | chan->unacked_frames) { |
3ce3514f | 1618 | if (bt_cb(skb)->control.txseq == chan->expected_ack_seq) |
1c2acffb | 1619 | break; |
1da177e4 | 1620 | |
58d35f87 | 1621 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 1622 | kfree_skb(skb); |
1da177e4 | 1623 | |
6a026610 | 1624 | chan->unacked_frames--; |
1c2acffb | 1625 | } |
1da177e4 | 1626 | |
6a026610 | 1627 | if (!chan->unacked_frames) |
1a09bcb9 | 1628 | __clear_retrans_timer(chan); |
1c2acffb | 1629 | } |
1da177e4 | 1630 | |
67c9e840 | 1631 | static void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1632 | { |
ccbb84af | 1633 | struct sk_buff *skb; |
88843ab0 AE |
1634 | u32 control; |
1635 | u16 fcs; | |
6840ed07 | 1636 | |
58d35f87 | 1637 | while ((skb = skb_dequeue(&chan->tx_q))) { |
88843ab0 | 1638 | control = __get_control(chan, skb->data + L2CAP_HDR_SIZE); |
fb45de7d | 1639 | control |= __set_txseq(chan, chan->next_tx_seq); |
94122bbe | 1640 | control |= __set_ctrl_sar(chan, bt_cb(skb)->control.sar); |
88843ab0 | 1641 | __put_control(chan, control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1642 | |
47d1ec61 | 1643 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1644 | fcs = crc16(0, (u8 *)skb->data, |
1645 | skb->len - L2CAP_FCS_SIZE); | |
1646 | put_unaligned_le16(fcs, | |
1647 | skb->data + skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1648 | } |
1649 | ||
4343478f | 1650 | l2cap_do_send(chan, skb); |
6840ed07 | 1651 | |
836be934 | 1652 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); |
6840ed07 | 1653 | } |
6840ed07 GP |
1654 | } |
1655 | ||
fb45de7d | 1656 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 1657 | { |
8f17154f | 1658 | struct sk_buff *skb, *tx_skb; |
88843ab0 AE |
1659 | u16 fcs; |
1660 | u32 control; | |
8f17154f | 1661 | |
58d35f87 | 1662 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1663 | if (!skb) |
1664 | return; | |
8f17154f | 1665 | |
3ce3514f | 1666 | while (bt_cb(skb)->control.txseq != tx_seq) { |
58d35f87 | 1667 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1668 | return; |
8f17154f | 1669 | |
d1726b6d SJ |
1670 | skb = skb_queue_next(&chan->tx_q, skb); |
1671 | } | |
8f17154f | 1672 | |
3ce3514f MM |
1673 | if (bt_cb(skb)->control.retries == chan->remote_max_tx && |
1674 | chan->remote_max_tx) { | |
8c1d787b | 1675 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
f11d676d GP |
1676 | return; |
1677 | } | |
1678 | ||
1679 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
3ce3514f | 1680 | bt_cb(skb)->control.retries++; |
88843ab0 AE |
1681 | |
1682 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); | |
7e0ef6ee | 1683 | control &= __get_sar_mask(chan); |
3cb123d1 | 1684 | |
e2ab4353 | 1685 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1686 | control |= __set_ctrl_final(chan); |
95ffa978 | 1687 | |
0b209fae | 1688 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1689 | control |= __set_txseq(chan, tx_seq); |
3cb123d1 | 1690 | |
88843ab0 | 1691 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
f11d676d | 1692 | |
47d1ec61 | 1693 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1694 | fcs = crc16(0, (u8 *)tx_skb->data, |
1695 | tx_skb->len - L2CAP_FCS_SIZE); | |
1696 | put_unaligned_le16(fcs, | |
1697 | tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE); | |
f11d676d GP |
1698 | } |
1699 | ||
4343478f | 1700 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1701 | } |
1702 | ||
67c9e840 | 1703 | static int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1704 | { |
1705 | struct sk_buff *skb, *tx_skb; | |
88843ab0 AE |
1706 | u16 fcs; |
1707 | u32 control; | |
9a9c6a34 | 1708 | int nsent = 0; |
1c2acffb | 1709 | |
89bc500e | 1710 | if (chan->state != BT_CONNECTED) |
c13ffa62 | 1711 | return -ENOTCONN; |
e90bac06 | 1712 | |
94122bbe MM |
1713 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
1714 | return 0; | |
1715 | ||
58d35f87 | 1716 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1717 | |
3ce3514f MM |
1718 | if (bt_cb(skb)->control.retries == chan->remote_max_tx && |
1719 | chan->remote_max_tx) { | |
8c1d787b | 1720 | l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED); |
e90bac06 GP |
1721 | break; |
1722 | } | |
1723 | ||
e420aba3 AE |
1724 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1725 | ||
3ce3514f | 1726 | bt_cb(skb)->control.retries++; |
e90bac06 | 1727 | |
88843ab0 | 1728 | control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE); |
7e0ef6ee | 1729 | control &= __get_sar_mask(chan); |
95ffa978 | 1730 | |
e2ab4353 | 1731 | if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state)) |
03f6715d | 1732 | control |= __set_ctrl_final(chan); |
e2ab4353 | 1733 | |
0b209fae | 1734 | control |= __set_reqseq(chan, chan->buffer_seq); |
fb45de7d | 1735 | control |= __set_txseq(chan, chan->next_tx_seq); |
94122bbe | 1736 | control |= __set_ctrl_sar(chan, bt_cb(skb)->control.sar); |
1c2acffb | 1737 | |
88843ab0 | 1738 | __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE); |
e90bac06 | 1739 | |
47d1ec61 | 1740 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 AE |
1741 | fcs = crc16(0, (u8 *)skb->data, |
1742 | tx_skb->len - L2CAP_FCS_SIZE); | |
1743 | put_unaligned_le16(fcs, skb->data + | |
1744 | tx_skb->len - L2CAP_FCS_SIZE); | |
fcc203c3 GP |
1745 | } |
1746 | ||
4343478f | 1747 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1748 | |
1a09bcb9 | 1749 | __set_retrans_timer(chan); |
1c2acffb | 1750 | |
3ce3514f | 1751 | bt_cb(skb)->control.txseq = chan->next_tx_seq; |
836be934 AE |
1752 | |
1753 | chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq); | |
1c2acffb | 1754 | |
3ce3514f | 1755 | if (bt_cb(skb)->control.retries == 1) { |
6a026610 | 1756 | chan->unacked_frames++; |
930fa4ae SJ |
1757 | |
1758 | if (!nsent++) | |
1759 | __clear_ack_timer(chan); | |
8ed7a0ae | 1760 | } |
23e9fde2 | 1761 | |
6a026610 | 1762 | chan->frames_sent++; |
1c2acffb | 1763 | |
58d35f87 GP |
1764 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1765 | chan->tx_send_head = NULL; | |
1c2acffb | 1766 | else |
58d35f87 | 1767 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
1c2acffb GP |
1768 | } |
1769 | ||
9e917af1 GP |
1770 | return nsent; |
1771 | } | |
1772 | ||
525cd185 | 1773 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1774 | { |
dfc909be GP |
1775 | int ret; |
1776 | ||
58d35f87 GP |
1777 | if (!skb_queue_empty(&chan->tx_q)) |
1778 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1779 | |
42e5c802 | 1780 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1781 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1782 | return ret; |
1783 | } | |
1784 | ||
b17e73bb | 1785 | static void __l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1786 | { |
88843ab0 | 1787 | u32 control = 0; |
9e917af1 | 1788 | |
0b209fae | 1789 | control |= __set_reqseq(chan, chan->buffer_seq); |
9e917af1 | 1790 | |
e2ab4353 | 1791 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 1792 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
e2ab4353 | 1793 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
525cd185 | 1794 | l2cap_send_sframe(chan, control); |
9a9c6a34 | 1795 | return; |
9e917af1 | 1796 | } |
dfc909be | 1797 | |
525cd185 | 1798 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1799 | return; |
1800 | ||
ab784b73 | 1801 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 1802 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1803 | } |
1804 | ||
b17e73bb SJ |
1805 | static void l2cap_send_ack(struct l2cap_chan *chan) |
1806 | { | |
1807 | __clear_ack_timer(chan); | |
1808 | __l2cap_send_ack(chan); | |
1809 | } | |
1810 | ||
525cd185 | 1811 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1812 | { |
1813 | struct srej_list *tail; | |
88843ab0 | 1814 | u32 control; |
99b0d4b7 | 1815 | |
ab784b73 | 1816 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
03f6715d | 1817 | control |= __set_ctrl_final(chan); |
99b0d4b7 | 1818 | |
39d5a3ee | 1819 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
0b209fae | 1820 | control |= __set_reqseq(chan, tail->tx_seq); |
99b0d4b7 | 1821 | |
525cd185 | 1822 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1823 | } |
1824 | ||
04124681 GP |
1825 | static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, |
1826 | struct msghdr *msg, int len, | |
1827 | int count, struct sk_buff *skb) | |
1c2acffb | 1828 | { |
0952a57a | 1829 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1830 | struct sk_buff **frag; |
90338947 | 1831 | int sent = 0; |
1da177e4 | 1832 | |
59203a21 | 1833 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1834 | return -EFAULT; |
1da177e4 LT |
1835 | |
1836 | sent += count; | |
1837 | len -= count; | |
1838 | ||
1839 | /* Continuation fragments (no L2CAP header) */ | |
1840 | frag = &skb_shinfo(skb)->frag_list; | |
1841 | while (len) { | |
fbe00700 GP |
1842 | struct sk_buff *tmp; |
1843 | ||
1da177e4 LT |
1844 | count = min_t(unsigned int, conn->mtu, len); |
1845 | ||
fbe00700 GP |
1846 | tmp = chan->ops->alloc_skb(chan, count, |
1847 | msg->msg_flags & MSG_DONTWAIT); | |
1848 | if (IS_ERR(tmp)) | |
1849 | return PTR_ERR(tmp); | |
1850 | ||
1851 | *frag = tmp; | |
2f7719ce | 1852 | |
1c2acffb GP |
1853 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1854 | return -EFAULT; | |
1da177e4 | 1855 | |
5e59b791 LAD |
1856 | (*frag)->priority = skb->priority; |
1857 | ||
1da177e4 LT |
1858 | sent += count; |
1859 | len -= count; | |
1860 | ||
2d0ed3d5 GP |
1861 | skb->len += (*frag)->len; |
1862 | skb->data_len += (*frag)->len; | |
1863 | ||
1da177e4 LT |
1864 | frag = &(*frag)->next; |
1865 | } | |
1da177e4 LT |
1866 | |
1867 | return sent; | |
1c2acffb | 1868 | } |
1da177e4 | 1869 | |
5e59b791 LAD |
1870 | static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, |
1871 | struct msghdr *msg, size_t len, | |
1872 | u32 priority) | |
1c2acffb | 1873 | { |
8c1d787b | 1874 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1875 | struct sk_buff *skb; |
03a51213 | 1876 | int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE; |
1c2acffb GP |
1877 | struct l2cap_hdr *lh; |
1878 | ||
6d5922b0 | 1879 | BT_DBG("chan %p len %d priority %u", chan, (int)len, priority); |
1c2acffb GP |
1880 | |
1881 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
2f7719ce AE |
1882 | |
1883 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1884 | msg->msg_flags & MSG_DONTWAIT); |
1885 | if (IS_ERR(skb)) | |
1886 | return skb; | |
1c2acffb | 1887 | |
5e59b791 LAD |
1888 | skb->priority = priority; |
1889 | ||
1c2acffb GP |
1890 | /* Create L2CAP header */ |
1891 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1892 | lh->cid = cpu_to_le16(chan->dcid); |
daf6a78c AE |
1893 | lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE); |
1894 | put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE)); | |
1c2acffb | 1895 | |
0952a57a | 1896 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1897 | if (unlikely(err < 0)) { |
1898 | kfree_skb(skb); | |
1899 | return ERR_PTR(err); | |
1900 | } | |
1901 | return skb; | |
1902 | } | |
1903 | ||
5e59b791 LAD |
1904 | static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, |
1905 | struct msghdr *msg, size_t len, | |
1906 | u32 priority) | |
1c2acffb | 1907 | { |
8c1d787b | 1908 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1909 | struct sk_buff *skb; |
f2ba7fae | 1910 | int err, count; |
1c2acffb GP |
1911 | struct l2cap_hdr *lh; |
1912 | ||
6d5922b0 | 1913 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1914 | |
f2ba7fae | 1915 | count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len); |
2f7719ce | 1916 | |
f2ba7fae | 1917 | skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE, |
90338947 GP |
1918 | msg->msg_flags & MSG_DONTWAIT); |
1919 | if (IS_ERR(skb)) | |
1920 | return skb; | |
1c2acffb | 1921 | |
5e59b791 LAD |
1922 | skb->priority = priority; |
1923 | ||
1c2acffb GP |
1924 | /* Create L2CAP header */ |
1925 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1926 | lh->cid = cpu_to_le16(chan->dcid); |
6ff9b5ef | 1927 | lh->len = cpu_to_le16(len); |
1c2acffb | 1928 | |
0952a57a | 1929 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1930 | if (unlikely(err < 0)) { |
1931 | kfree_skb(skb); | |
1932 | return ERR_PTR(err); | |
1933 | } | |
1934 | return skb; | |
1935 | } | |
1936 | ||
ab0ff76d LAD |
1937 | static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, |
1938 | struct msghdr *msg, size_t len, | |
94122bbe | 1939 | u16 sdulen) |
1c2acffb | 1940 | { |
8c1d787b | 1941 | struct l2cap_conn *conn = chan->conn; |
1c2acffb | 1942 | struct sk_buff *skb; |
e4ca6d98 | 1943 | int err, count, hlen; |
1c2acffb GP |
1944 | struct l2cap_hdr *lh; |
1945 | ||
6d5922b0 | 1946 | BT_DBG("chan %p len %d", chan, (int)len); |
1c2acffb | 1947 | |
0ee0d208 GP |
1948 | if (!conn) |
1949 | return ERR_PTR(-ENOTCONN); | |
1950 | ||
e4ca6d98 AE |
1951 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) |
1952 | hlen = L2CAP_EXT_HDR_SIZE; | |
1953 | else | |
1954 | hlen = L2CAP_ENH_HDR_SIZE; | |
1955 | ||
c74e560c | 1956 | if (sdulen) |
03a51213 | 1957 | hlen += L2CAP_SDULEN_SIZE; |
c74e560c | 1958 | |
47d1ec61 | 1959 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1960 | hlen += L2CAP_FCS_SIZE; |
fcc203c3 | 1961 | |
1c2acffb | 1962 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
2f7719ce AE |
1963 | |
1964 | skb = chan->ops->alloc_skb(chan, count + hlen, | |
90338947 GP |
1965 | msg->msg_flags & MSG_DONTWAIT); |
1966 | if (IS_ERR(skb)) | |
1967 | return skb; | |
1c2acffb GP |
1968 | |
1969 | /* Create L2CAP header */ | |
1970 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fe4128e0 | 1971 | lh->cid = cpu_to_le16(chan->dcid); |
1c2acffb | 1972 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
88843ab0 | 1973 | |
94122bbe | 1974 | __put_control(chan, 0, skb_put(skb, __ctrl_size(chan))); |
88843ab0 | 1975 | |
c74e560c | 1976 | if (sdulen) |
03a51213 | 1977 | put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE)); |
1c2acffb | 1978 | |
0952a57a | 1979 | err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb); |
1c2acffb GP |
1980 | if (unlikely(err < 0)) { |
1981 | kfree_skb(skb); | |
1982 | return ERR_PTR(err); | |
1983 | } | |
e90bac06 | 1984 | |
47d1ec61 | 1985 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 1986 | put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE)); |
fcc203c3 | 1987 | |
3ce3514f | 1988 | bt_cb(skb)->control.retries = 0; |
1c2acffb | 1989 | return skb; |
1da177e4 LT |
1990 | } |
1991 | ||
94122bbe MM |
1992 | static int l2cap_segment_sdu(struct l2cap_chan *chan, |
1993 | struct sk_buff_head *seg_queue, | |
1994 | struct msghdr *msg, size_t len) | |
c74e560c | 1995 | { |
c74e560c | 1996 | struct sk_buff *skb; |
94122bbe MM |
1997 | u16 sdu_len; |
1998 | size_t pdu_len; | |
1999 | int err = 0; | |
2000 | u8 sar; | |
c74e560c | 2001 | |
94122bbe | 2002 | BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len); |
c74e560c | 2003 | |
94122bbe MM |
2004 | /* It is critical that ERTM PDUs fit in a single HCI fragment, |
2005 | * so fragmented skbs are not used. The HCI layer's handling | |
2006 | * of fragmented skbs is not compatible with ERTM's queueing. | |
2007 | */ | |
c74e560c | 2008 | |
94122bbe MM |
2009 | /* PDU size is derived from the HCI MTU */ |
2010 | pdu_len = chan->conn->mtu; | |
c74e560c | 2011 | |
94122bbe MM |
2012 | pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD); |
2013 | ||
2014 | /* Adjust for largest possible L2CAP overhead. */ | |
2015 | pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE; | |
2016 | ||
2017 | /* Remote device may have requested smaller PDUs */ | |
2018 | pdu_len = min_t(size_t, pdu_len, chan->remote_mps); | |
2019 | ||
2020 | if (len <= pdu_len) { | |
2021 | sar = L2CAP_SAR_UNSEGMENTED; | |
2022 | sdu_len = 0; | |
2023 | pdu_len = len; | |
2024 | } else { | |
2025 | sar = L2CAP_SAR_START; | |
2026 | sdu_len = len; | |
2027 | pdu_len -= L2CAP_SDULEN_SIZE; | |
2028 | } | |
2029 | ||
2030 | while (len > 0) { | |
2031 | skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len); | |
c74e560c | 2032 | |
c74e560c | 2033 | if (IS_ERR(skb)) { |
94122bbe | 2034 | __skb_queue_purge(seg_queue); |
c74e560c GP |
2035 | return PTR_ERR(skb); |
2036 | } | |
2037 | ||
94122bbe MM |
2038 | bt_cb(skb)->control.sar = sar; |
2039 | __skb_queue_tail(seg_queue, skb); | |
2040 | ||
2041 | len -= pdu_len; | |
2042 | if (sdu_len) { | |
2043 | sdu_len = 0; | |
2044 | pdu_len += L2CAP_SDULEN_SIZE; | |
2045 | } | |
2046 | ||
2047 | if (len <= pdu_len) { | |
2048 | sar = L2CAP_SAR_END; | |
2049 | pdu_len = len; | |
2050 | } else { | |
2051 | sar = L2CAP_SAR_CONTINUE; | |
2052 | } | |
c74e560c | 2053 | } |
c74e560c | 2054 | |
94122bbe | 2055 | return err; |
c74e560c GP |
2056 | } |
2057 | ||
5e59b791 LAD |
2058 | int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len, |
2059 | u32 priority) | |
9a91a04a | 2060 | { |
9a91a04a | 2061 | struct sk_buff *skb; |
9a91a04a | 2062 | int err; |
94122bbe | 2063 | struct sk_buff_head seg_queue; |
9a91a04a GP |
2064 | |
2065 | /* Connectionless channel */ | |
715ec005 | 2066 | if (chan->chan_type == L2CAP_CHAN_CONN_LESS) { |
5e59b791 | 2067 | skb = l2cap_create_connless_pdu(chan, msg, len, priority); |
9a91a04a GP |
2068 | if (IS_ERR(skb)) |
2069 | return PTR_ERR(skb); | |
2070 | ||
2071 | l2cap_do_send(chan, skb); | |
2072 | return len; | |
2073 | } | |
2074 | ||
2075 | switch (chan->mode) { | |
2076 | case L2CAP_MODE_BASIC: | |
2077 | /* Check outgoing MTU */ | |
2078 | if (len > chan->omtu) | |
2079 | return -EMSGSIZE; | |
2080 | ||
2081 | /* Create a basic PDU */ | |
5e59b791 | 2082 | skb = l2cap_create_basic_pdu(chan, msg, len, priority); |
9a91a04a GP |
2083 | if (IS_ERR(skb)) |
2084 | return PTR_ERR(skb); | |
2085 | ||
2086 | l2cap_do_send(chan, skb); | |
2087 | err = len; | |
2088 | break; | |
2089 | ||
2090 | case L2CAP_MODE_ERTM: | |
2091 | case L2CAP_MODE_STREAMING: | |
94122bbe MM |
2092 | /* Check outgoing MTU */ |
2093 | if (len > chan->omtu) { | |
2094 | err = -EMSGSIZE; | |
2095 | break; | |
2096 | } | |
9a91a04a | 2097 | |
94122bbe | 2098 | __skb_queue_head_init(&seg_queue); |
9a91a04a | 2099 | |
94122bbe MM |
2100 | /* Do segmentation before calling in to the state machine, |
2101 | * since it's possible to block while waiting for memory | |
2102 | * allocation. | |
2103 | */ | |
2104 | err = l2cap_segment_sdu(chan, &seg_queue, msg, len); | |
9a91a04a | 2105 | |
94122bbe MM |
2106 | /* The channel could have been closed while segmenting, |
2107 | * check that it is still connected. | |
2108 | */ | |
2109 | if (chan->state != BT_CONNECTED) { | |
2110 | __skb_queue_purge(&seg_queue); | |
2111 | err = -ENOTCONN; | |
9a91a04a GP |
2112 | } |
2113 | ||
94122bbe | 2114 | if (err) |
9a91a04a | 2115 | break; |
9a91a04a | 2116 | |
577cfaeb MM |
2117 | if (chan->mode == L2CAP_MODE_ERTM && chan->tx_send_head == NULL) |
2118 | chan->tx_send_head = seg_queue.next; | |
94122bbe | 2119 | skb_queue_splice_tail_init(&seg_queue, &chan->tx_q); |
577cfaeb | 2120 | |
94122bbe MM |
2121 | if (chan->mode == L2CAP_MODE_ERTM) |
2122 | err = l2cap_ertm_send(chan); | |
2123 | else | |
2124 | l2cap_streaming_send(chan); | |
9a91a04a | 2125 | |
9a91a04a GP |
2126 | if (err >= 0) |
2127 | err = len; | |
2128 | ||
94122bbe MM |
2129 | /* If the skbs were not queued for sending, they'll still be in |
2130 | * seg_queue and need to be purged. | |
2131 | */ | |
2132 | __skb_queue_purge(&seg_queue); | |
9a91a04a GP |
2133 | break; |
2134 | ||
2135 | default: | |
2136 | BT_DBG("bad state %1.1x", chan->mode); | |
2137 | err = -EBADFD; | |
2138 | } | |
2139 | ||
2140 | return err; | |
2141 | } | |
2142 | ||
1da177e4 LT |
2143 | /* Copy frame to all raw sockets on that connection */ |
2144 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2145 | { | |
1da177e4 | 2146 | struct sk_buff *nskb; |
48454079 | 2147 | struct l2cap_chan *chan; |
1da177e4 LT |
2148 | |
2149 | BT_DBG("conn %p", conn); | |
2150 | ||
3df91ea2 | 2151 | mutex_lock(&conn->chan_lock); |
3d57dc68 | 2152 | |
3df91ea2 | 2153 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 2154 | struct sock *sk = chan->sk; |
715ec005 | 2155 | if (chan->chan_type != L2CAP_CHAN_RAW) |
1da177e4 LT |
2156 | continue; |
2157 | ||
2158 | /* Don't send frame to the socket it came from */ | |
2159 | if (skb->sk == sk) | |
2160 | continue; | |
af05b30b GP |
2161 | nskb = skb_clone(skb, GFP_ATOMIC); |
2162 | if (!nskb) | |
1da177e4 LT |
2163 | continue; |
2164 | ||
23070494 | 2165 | if (chan->ops->recv(chan->data, nskb)) |
1da177e4 LT |
2166 | kfree_skb(nskb); |
2167 | } | |
3d57dc68 | 2168 | |
3df91ea2 | 2169 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
2170 | } |
2171 | ||
2172 | /* ---- L2CAP signalling commands ---- */ | |
2173 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2174 | u8 code, u8 ident, u16 dlen, void *data) | |
2175 | { | |
2176 | struct sk_buff *skb, **frag; | |
2177 | struct l2cap_cmd_hdr *cmd; | |
2178 | struct l2cap_hdr *lh; | |
2179 | int len, count; | |
2180 | ||
af05b30b GP |
2181 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2182 | conn, code, ident, dlen); | |
1da177e4 LT |
2183 | |
2184 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2185 | count = min_t(unsigned int, conn->mtu, len); | |
2186 | ||
2187 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2188 | if (!skb) | |
2189 | return NULL; | |
2190 | ||
2191 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2192 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
2193 | |
2194 | if (conn->hcon->type == LE_LINK) | |
2195 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
2196 | else | |
2197 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
2198 | |
2199 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2200 | cmd->code = code; | |
2201 | cmd->ident = ident; | |
aca3192c | 2202 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2203 | |
2204 | if (dlen) { | |
2205 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2206 | memcpy(skb_put(skb, count), data, count); | |
2207 | data += count; | |
2208 | } | |
2209 | ||
2210 | len -= skb->len; | |
2211 | ||
2212 | /* Continuation fragments (no L2CAP header) */ | |
2213 | frag = &skb_shinfo(skb)->frag_list; | |
2214 | while (len) { | |
2215 | count = min_t(unsigned int, conn->mtu, len); | |
2216 | ||
2217 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2218 | if (!*frag) | |
2219 | goto fail; | |
2220 | ||
2221 | memcpy(skb_put(*frag, count), data, count); | |
2222 | ||
2223 | len -= count; | |
2224 | data += count; | |
2225 | ||
2226 | frag = &(*frag)->next; | |
2227 | } | |
2228 | ||
2229 | return skb; | |
2230 | ||
2231 | fail: | |
2232 | kfree_skb(skb); | |
2233 | return NULL; | |
2234 | } | |
2235 | ||
2236 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2237 | { | |
2238 | struct l2cap_conf_opt *opt = *ptr; | |
2239 | int len; | |
2240 | ||
2241 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2242 | *ptr += len; | |
2243 | ||
2244 | *type = opt->type; | |
2245 | *olen = opt->len; | |
2246 | ||
2247 | switch (opt->len) { | |
2248 | case 1: | |
2249 | *val = *((u8 *) opt->val); | |
2250 | break; | |
2251 | ||
2252 | case 2: | |
bfaaeb3e | 2253 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2254 | break; |
2255 | ||
2256 | case 4: | |
bfaaeb3e | 2257 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2258 | break; |
2259 | ||
2260 | default: | |
2261 | *val = (unsigned long) opt->val; | |
2262 | break; | |
2263 | } | |
2264 | ||
2265 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2266 | return len; | |
2267 | } | |
2268 | ||
1da177e4 LT |
2269 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2270 | { | |
2271 | struct l2cap_conf_opt *opt = *ptr; | |
2272 | ||
2273 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2274 | ||
2275 | opt->type = type; | |
2276 | opt->len = len; | |
2277 | ||
2278 | switch (len) { | |
2279 | case 1: | |
2280 | *((u8 *) opt->val) = val; | |
2281 | break; | |
2282 | ||
2283 | case 2: | |
4f8b691c | 2284 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2285 | break; |
2286 | ||
2287 | case 4: | |
4f8b691c | 2288 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2289 | break; |
2290 | ||
2291 | default: | |
2292 | memcpy(opt->val, (void *) val, len); | |
2293 | break; | |
2294 | } | |
2295 | ||
2296 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2297 | } | |
2298 | ||
f89cef09 AE |
2299 | static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan) |
2300 | { | |
2301 | struct l2cap_conf_efs efs; | |
2302 | ||
1ec918ce | 2303 | switch (chan->mode) { |
f89cef09 AE |
2304 | case L2CAP_MODE_ERTM: |
2305 | efs.id = chan->local_id; | |
2306 | efs.stype = chan->local_stype; | |
2307 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2308 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2309 | efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT); | |
2310 | efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO); | |
2311 | break; | |
2312 | ||
2313 | case L2CAP_MODE_STREAMING: | |
2314 | efs.id = 1; | |
2315 | efs.stype = L2CAP_SERV_BESTEFFORT; | |
2316 | efs.msdu = cpu_to_le16(chan->local_msdu); | |
2317 | efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime); | |
2318 | efs.acc_lat = 0; | |
2319 | efs.flush_to = 0; | |
2320 | break; | |
2321 | ||
2322 | default: | |
2323 | return; | |
2324 | } | |
2325 | ||
2326 | l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs), | |
2327 | (unsigned long) &efs); | |
2328 | } | |
2329 | ||
721c4181 | 2330 | static void l2cap_ack_timeout(struct work_struct *work) |
c1b4f43b | 2331 | { |
721c4181 GP |
2332 | struct l2cap_chan *chan = container_of(work, struct l2cap_chan, |
2333 | ack_timer.work); | |
c1b4f43b | 2334 | |
2fb9b3d4 GP |
2335 | BT_DBG("chan %p", chan); |
2336 | ||
6be36555 AE |
2337 | l2cap_chan_lock(chan); |
2338 | ||
b17e73bb | 2339 | __l2cap_send_ack(chan); |
6be36555 AE |
2340 | |
2341 | l2cap_chan_unlock(chan); | |
09bfb2ee SJ |
2342 | |
2343 | l2cap_chan_put(chan); | |
c1b4f43b GP |
2344 | } |
2345 | ||
3c588192 | 2346 | static inline int l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 2347 | { |
3c588192 MM |
2348 | int err; |
2349 | ||
105bdf9e MM |
2350 | chan->next_tx_seq = 0; |
2351 | chan->expected_tx_seq = 0; | |
42e5c802 | 2352 | chan->expected_ack_seq = 0; |
6a026610 | 2353 | chan->unacked_frames = 0; |
42e5c802 | 2354 | chan->buffer_seq = 0; |
6a026610 GP |
2355 | chan->num_acked = 0; |
2356 | chan->frames_sent = 0; | |
105bdf9e MM |
2357 | chan->last_acked_seq = 0; |
2358 | chan->sdu = NULL; | |
2359 | chan->sdu_last_frag = NULL; | |
2360 | chan->sdu_len = 0; | |
2361 | ||
d34c34fb MM |
2362 | skb_queue_head_init(&chan->tx_q); |
2363 | ||
105bdf9e MM |
2364 | if (chan->mode != L2CAP_MODE_ERTM) |
2365 | return 0; | |
2366 | ||
2367 | chan->rx_state = L2CAP_RX_STATE_RECV; | |
2368 | chan->tx_state = L2CAP_TX_STATE_XMIT; | |
0565c1c2 | 2369 | |
721c4181 GP |
2370 | INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout); |
2371 | INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout); | |
2372 | INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout); | |
0565c1c2 | 2373 | |
f1c6775b | 2374 | skb_queue_head_init(&chan->srej_q); |
1890d36b | 2375 | |
39d5a3ee | 2376 | INIT_LIST_HEAD(&chan->srej_l); |
3c588192 MM |
2377 | err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win); |
2378 | if (err < 0) | |
2379 | return err; | |
2380 | ||
2381 | return l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win); | |
0565c1c2 GP |
2382 | } |
2383 | ||
f2fcfcd6 GP |
2384 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2385 | { | |
2386 | switch (mode) { | |
2387 | case L2CAP_MODE_STREAMING: | |
2388 | case L2CAP_MODE_ERTM: | |
2389 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2390 | return mode; | |
2391 | /* fall through */ | |
2392 | default: | |
2393 | return L2CAP_MODE_BASIC; | |
2394 | } | |
2395 | } | |
2396 | ||
6327eb98 AE |
2397 | static inline bool __l2cap_ews_supported(struct l2cap_chan *chan) |
2398 | { | |
2399 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW; | |
2400 | } | |
2401 | ||
f89cef09 AE |
2402 | static inline bool __l2cap_efs_supported(struct l2cap_chan *chan) |
2403 | { | |
2404 | return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW; | |
2405 | } | |
2406 | ||
6327eb98 AE |
2407 | static inline void l2cap_txwin_setup(struct l2cap_chan *chan) |
2408 | { | |
2409 | if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW && | |
836be934 | 2410 | __l2cap_ews_supported(chan)) { |
6327eb98 AE |
2411 | /* use extended control field */ |
2412 | set_bit(FLAG_EXT_CTRL, &chan->flags); | |
836be934 AE |
2413 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
2414 | } else { | |
6327eb98 AE |
2415 | chan->tx_win = min_t(u16, chan->tx_win, |
2416 | L2CAP_DEFAULT_TX_WINDOW); | |
836be934 AE |
2417 | chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW; |
2418 | } | |
6327eb98 AE |
2419 | } |
2420 | ||
710f9b0a | 2421 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2422 | { |
1da177e4 | 2423 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 2424 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 | 2425 | void *ptr = req->data; |
c8f79162 | 2426 | u16 size; |
1da177e4 | 2427 | |
49208c9c | 2428 | BT_DBG("chan %p", chan); |
1da177e4 | 2429 | |
73ffa904 | 2430 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
2431 | goto done; |
2432 | ||
0c1bc5c6 | 2433 | switch (chan->mode) { |
f2fcfcd6 GP |
2434 | case L2CAP_MODE_STREAMING: |
2435 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2436 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) |
85eb53c6 | 2437 | break; |
85eb53c6 | 2438 | |
f89cef09 AE |
2439 | if (__l2cap_efs_supported(chan)) |
2440 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2441 | ||
2ba13ed6 | 2442 | /* fall through */ |
f2fcfcd6 | 2443 | default: |
8c1d787b | 2444 | chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask); |
f2fcfcd6 GP |
2445 | break; |
2446 | } | |
2447 | ||
2448 | done: | |
0c1bc5c6 GP |
2449 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
2450 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 2451 | |
0c1bc5c6 | 2452 | switch (chan->mode) { |
65c7c491 | 2453 | case L2CAP_MODE_BASIC: |
8c1d787b GP |
2454 | if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2455 | !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
63406504 GP |
2456 | break; |
2457 | ||
62547752 GP |
2458 | rfc.mode = L2CAP_MODE_BASIC; |
2459 | rfc.txwin_size = 0; | |
2460 | rfc.max_transmit = 0; | |
2461 | rfc.retrans_timeout = 0; | |
2462 | rfc.monitor_timeout = 0; | |
2463 | rfc.max_pdu_size = 0; | |
2464 | ||
63406504 GP |
2465 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2466 | (unsigned long) &rfc); | |
65c7c491 MH |
2467 | break; |
2468 | ||
2469 | case L2CAP_MODE_ERTM: | |
2470 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 | 2471 | rfc.max_transmit = chan->max_tx; |
f2fcfcd6 GP |
2472 | rfc.retrans_timeout = 0; |
2473 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2474 | |
2475 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2476 | L2CAP_EXT_HDR_SIZE - | |
2477 | L2CAP_SDULEN_SIZE - | |
2478 | L2CAP_FCS_SIZE); | |
2479 | rfc.max_pdu_size = cpu_to_le16(size); | |
f2fcfcd6 | 2480 | |
6327eb98 AE |
2481 | l2cap_txwin_setup(chan); |
2482 | ||
2483 | rfc.txwin_size = min_t(u16, chan->tx_win, | |
2484 | L2CAP_DEFAULT_TX_WINDOW); | |
f2fcfcd6 | 2485 | |
63406504 GP |
2486 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2487 | (unsigned long) &rfc); | |
2488 | ||
f89cef09 AE |
2489 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2490 | l2cap_add_opt_efs(&ptr, chan); | |
2491 | ||
8c1d787b | 2492 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2493 | break; |
2494 | ||
47d1ec61 | 2495 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2496 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2497 | chan->fcs = L2CAP_FCS_NONE; |
2498 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2499 | } |
6327eb98 AE |
2500 | |
2501 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
2502 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, | |
2503 | chan->tx_win); | |
f2fcfcd6 GP |
2504 | break; |
2505 | ||
2506 | case L2CAP_MODE_STREAMING: | |
2507 | rfc.mode = L2CAP_MODE_STREAMING; | |
2508 | rfc.txwin_size = 0; | |
2509 | rfc.max_transmit = 0; | |
2510 | rfc.retrans_timeout = 0; | |
2511 | rfc.monitor_timeout = 0; | |
c8f79162 AE |
2512 | |
2513 | size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu - | |
2514 | L2CAP_EXT_HDR_SIZE - | |
2515 | L2CAP_SDULEN_SIZE - | |
2516 | L2CAP_FCS_SIZE); | |
2517 | rfc.max_pdu_size = cpu_to_le16(size); | |
65c7c491 | 2518 | |
63406504 GP |
2519 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2520 | (unsigned long) &rfc); | |
2521 | ||
f89cef09 AE |
2522 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) |
2523 | l2cap_add_opt_efs(&ptr, chan); | |
2524 | ||
8c1d787b | 2525 | if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS)) |
fcc203c3 GP |
2526 | break; |
2527 | ||
47d1ec61 | 2528 | if (chan->fcs == L2CAP_FCS_NONE || |
c1360a1c | 2529 | test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) { |
47d1ec61 GP |
2530 | chan->fcs = L2CAP_FCS_NONE; |
2531 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 2532 | } |
65c7c491 MH |
2533 | break; |
2534 | } | |
1da177e4 | 2535 | |
fe4128e0 | 2536 | req->dcid = cpu_to_le16(chan->dcid); |
aca3192c | 2537 | req->flags = cpu_to_le16(0); |
1da177e4 LT |
2538 | |
2539 | return ptr - data; | |
2540 | } | |
2541 | ||
73ffa904 | 2542 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 2543 | { |
5dee9e7c MH |
2544 | struct l2cap_conf_rsp *rsp = data; |
2545 | void *ptr = rsp->data; | |
73ffa904 GP |
2546 | void *req = chan->conf_req; |
2547 | int len = chan->conf_len; | |
5dee9e7c MH |
2548 | int type, hint, olen; |
2549 | unsigned long val; | |
6464f35f | 2550 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
42dceae2 AE |
2551 | struct l2cap_conf_efs efs; |
2552 | u8 remote_efs = 0; | |
861d6882 | 2553 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2554 | u16 result = L2CAP_CONF_SUCCESS; |
c8f79162 | 2555 | u16 size; |
1da177e4 | 2556 | |
73ffa904 | 2557 | BT_DBG("chan %p", chan); |
820ae1b8 | 2558 | |
5dee9e7c MH |
2559 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2560 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2561 | |
589d2746 | 2562 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2563 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2564 | |
2565 | switch (type) { | |
2566 | case L2CAP_CONF_MTU: | |
861d6882 | 2567 | mtu = val; |
5dee9e7c MH |
2568 | break; |
2569 | ||
2570 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2571 | chan->flush_to = val; |
5dee9e7c MH |
2572 | break; |
2573 | ||
2574 | case L2CAP_CONF_QOS: | |
2575 | break; | |
2576 | ||
6464f35f MH |
2577 | case L2CAP_CONF_RFC: |
2578 | if (olen == sizeof(rfc)) | |
2579 | memcpy(&rfc, (void *) val, olen); | |
2580 | break; | |
2581 | ||
fcc203c3 GP |
2582 | case L2CAP_CONF_FCS: |
2583 | if (val == L2CAP_FCS_NONE) | |
c1360a1c | 2584 | set_bit(CONF_NO_FCS_RECV, &chan->conf_state); |
42dceae2 | 2585 | break; |
fcc203c3 | 2586 | |
42dceae2 AE |
2587 | case L2CAP_CONF_EFS: |
2588 | remote_efs = 1; | |
2589 | if (olen == sizeof(efs)) | |
2590 | memcpy(&efs, (void *) val, olen); | |
fcc203c3 GP |
2591 | break; |
2592 | ||
6327eb98 AE |
2593 | case L2CAP_CONF_EWS: |
2594 | if (!enable_hs) | |
2595 | return -ECONNREFUSED; | |
fcc203c3 | 2596 | |
6327eb98 AE |
2597 | set_bit(FLAG_EXT_CTRL, &chan->flags); |
2598 | set_bit(CONF_EWS_RECV, &chan->conf_state); | |
836be934 | 2599 | chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW; |
6327eb98 | 2600 | chan->remote_tx_win = val; |
fcc203c3 GP |
2601 | break; |
2602 | ||
5dee9e7c MH |
2603 | default: |
2604 | if (hint) | |
2605 | break; | |
2606 | ||
2607 | result = L2CAP_CONF_UNKNOWN; | |
2608 | *((u8 *) ptr++) = type; | |
2609 | break; | |
2610 | } | |
2611 | } | |
2612 | ||
73ffa904 | 2613 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
2614 | goto done; |
2615 | ||
0c1bc5c6 | 2616 | switch (chan->mode) { |
f2fcfcd6 GP |
2617 | case L2CAP_MODE_STREAMING: |
2618 | case L2CAP_MODE_ERTM: | |
c1360a1c | 2619 | if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) { |
0c1bc5c6 | 2620 | chan->mode = l2cap_select_mode(rfc.mode, |
8c1d787b | 2621 | chan->conn->feat_mask); |
85eb53c6 GP |
2622 | break; |
2623 | } | |
2624 | ||
42dceae2 AE |
2625 | if (remote_efs) { |
2626 | if (__l2cap_efs_supported(chan)) | |
2627 | set_bit(FLAG_EFS_ENABLE, &chan->flags); | |
2628 | else | |
2629 | return -ECONNREFUSED; | |
2630 | } | |
2631 | ||
0c1bc5c6 | 2632 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 2633 | return -ECONNREFUSED; |
742e519b | 2634 | |
f2fcfcd6 | 2635 | break; |
f2fcfcd6 GP |
2636 | } |
2637 | ||
2638 | done: | |
0c1bc5c6 | 2639 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 2640 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 2641 | rfc.mode = chan->mode; |
f2fcfcd6 | 2642 | |
73ffa904 | 2643 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
2644 | return -ECONNREFUSED; |
2645 | ||
2646 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2647 | sizeof(rfc), (unsigned long) &rfc); | |
2648 | } | |
2649 | ||
5dee9e7c MH |
2650 | if (result == L2CAP_CONF_SUCCESS) { |
2651 | /* Configure output options and let the other side know | |
2652 | * which ones we don't like. */ | |
2653 | ||
f2fcfcd6 GP |
2654 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2655 | result = L2CAP_CONF_UNACCEPT; | |
2656 | else { | |
0c1bc5c6 | 2657 | chan->omtu = mtu; |
c1360a1c | 2658 | set_bit(CONF_MTU_DONE, &chan->conf_state); |
f2fcfcd6 | 2659 | } |
0c1bc5c6 | 2660 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 2661 | |
42dceae2 AE |
2662 | if (remote_efs) { |
2663 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2664 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2665 | efs.stype != chan->local_stype) { | |
2666 | ||
2667 | result = L2CAP_CONF_UNACCEPT; | |
2668 | ||
2669 | if (chan->num_conf_req >= 1) | |
2670 | return -ECONNREFUSED; | |
2671 | ||
2672 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
3e6b3b95 | 2673 | sizeof(efs), |
42dceae2 | 2674 | (unsigned long) &efs); |
0e8b207e | 2675 | } else { |
3e6b3b95 | 2676 | /* Send PENDING Conf Rsp */ |
0e8b207e AE |
2677 | result = L2CAP_CONF_PENDING; |
2678 | set_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
42dceae2 AE |
2679 | } |
2680 | } | |
2681 | ||
f2fcfcd6 GP |
2682 | switch (rfc.mode) { |
2683 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 2684 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 2685 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
f2fcfcd6 GP |
2686 | break; |
2687 | ||
2688 | case L2CAP_MODE_ERTM: | |
6327eb98 AE |
2689 | if (!test_bit(CONF_EWS_RECV, &chan->conf_state)) |
2690 | chan->remote_tx_win = rfc.txwin_size; | |
2691 | else | |
2692 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; | |
86b1b263 | 2693 | |
2c03a7a4 | 2694 | chan->remote_max_tx = rfc.max_transmit; |
1c762159 | 2695 | |
c8f79162 AE |
2696 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2697 | chan->conn->mtu - | |
2698 | L2CAP_EXT_HDR_SIZE - | |
2699 | L2CAP_SDULEN_SIZE - | |
2700 | L2CAP_FCS_SIZE); | |
2701 | rfc.max_pdu_size = cpu_to_le16(size); | |
2702 | chan->remote_mps = size; | |
f2fcfcd6 | 2703 | |
10467e9e | 2704 | rfc.retrans_timeout = |
4fd21a88 | 2705 | __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); |
10467e9e | 2706 | rfc.monitor_timeout = |
4fd21a88 | 2707 | __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); |
f2fcfcd6 | 2708 | |
c1360a1c | 2709 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2710 | |
2711 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2712 | sizeof(rfc), (unsigned long) &rfc); | |
2713 | ||
42dceae2 AE |
2714 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { |
2715 | chan->remote_id = efs.id; | |
2716 | chan->remote_stype = efs.stype; | |
2717 | chan->remote_msdu = le16_to_cpu(efs.msdu); | |
2718 | chan->remote_flush_to = | |
2719 | le32_to_cpu(efs.flush_to); | |
2720 | chan->remote_acc_lat = | |
2721 | le32_to_cpu(efs.acc_lat); | |
2722 | chan->remote_sdu_itime = | |
2723 | le32_to_cpu(efs.sdu_itime); | |
2724 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2725 | sizeof(efs), (unsigned long) &efs); | |
2726 | } | |
f2fcfcd6 GP |
2727 | break; |
2728 | ||
2729 | case L2CAP_MODE_STREAMING: | |
c8f79162 AE |
2730 | size = min_t(u16, le16_to_cpu(rfc.max_pdu_size), |
2731 | chan->conn->mtu - | |
2732 | L2CAP_EXT_HDR_SIZE - | |
2733 | L2CAP_SDULEN_SIZE - | |
2734 | L2CAP_FCS_SIZE); | |
2735 | rfc.max_pdu_size = cpu_to_le16(size); | |
2736 | chan->remote_mps = size; | |
f2fcfcd6 | 2737 | |
c1360a1c | 2738 | set_bit(CONF_MODE_DONE, &chan->conf_state); |
68ae6639 GP |
2739 | |
2740 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2741 | sizeof(rfc), (unsigned long) &rfc); | |
2742 | ||
f2fcfcd6 GP |
2743 | break; |
2744 | ||
2745 | default: | |
5dee9e7c | 2746 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2747 | |
6464f35f | 2748 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 2749 | rfc.mode = chan->mode; |
f2fcfcd6 | 2750 | } |
6464f35f | 2751 | |
f2fcfcd6 | 2752 | if (result == L2CAP_CONF_SUCCESS) |
c1360a1c | 2753 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); |
f2fcfcd6 | 2754 | } |
fe4128e0 | 2755 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c MH |
2756 | rsp->result = cpu_to_le16(result); |
2757 | rsp->flags = cpu_to_le16(0x0000); | |
2758 | ||
2759 | return ptr - data; | |
1da177e4 LT |
2760 | } |
2761 | ||
b4450035 | 2762 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 2763 | { |
f2fcfcd6 GP |
2764 | struct l2cap_conf_req *req = data; |
2765 | void *ptr = req->data; | |
2766 | int type, olen; | |
2767 | unsigned long val; | |
36e999a8 | 2768 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
66af7aaf | 2769 | struct l2cap_conf_efs efs; |
f2fcfcd6 | 2770 | |
fe4128e0 | 2771 | BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data); |
f2fcfcd6 GP |
2772 | |
2773 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2774 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2775 | ||
2776 | switch (type) { | |
2777 | case L2CAP_CONF_MTU: | |
2778 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2779 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 2780 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2781 | } else |
0c1bc5c6 GP |
2782 | chan->imtu = val; |
2783 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
2784 | break; |
2785 | ||
2786 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 2787 | chan->flush_to = val; |
f2fcfcd6 | 2788 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 2789 | 2, chan->flush_to); |
f2fcfcd6 GP |
2790 | break; |
2791 | ||
2792 | case L2CAP_CONF_RFC: | |
2793 | if (olen == sizeof(rfc)) | |
2794 | memcpy(&rfc, (void *)val, olen); | |
2795 | ||
c1360a1c | 2796 | if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) && |
0c1bc5c6 | 2797 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
2798 | return -ECONNREFUSED; |
2799 | ||
47d1ec61 | 2800 | chan->fcs = 0; |
f2fcfcd6 GP |
2801 | |
2802 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2803 | sizeof(rfc), (unsigned long) &rfc); | |
2804 | break; | |
6327eb98 AE |
2805 | |
2806 | case L2CAP_CONF_EWS: | |
2807 | chan->tx_win = min_t(u16, val, | |
2808 | L2CAP_DEFAULT_EXT_WINDOW); | |
3e6b3b95 GP |
2809 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2, |
2810 | chan->tx_win); | |
6327eb98 | 2811 | break; |
66af7aaf AE |
2812 | |
2813 | case L2CAP_CONF_EFS: | |
2814 | if (olen == sizeof(efs)) | |
2815 | memcpy(&efs, (void *)val, olen); | |
2816 | ||
2817 | if (chan->local_stype != L2CAP_SERV_NOTRAFIC && | |
2818 | efs.stype != L2CAP_SERV_NOTRAFIC && | |
2819 | efs.stype != chan->local_stype) | |
2820 | return -ECONNREFUSED; | |
2821 | ||
2822 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, | |
2823 | sizeof(efs), (unsigned long) &efs); | |
2824 | break; | |
f2fcfcd6 GP |
2825 | } |
2826 | } | |
2827 | ||
0c1bc5c6 | 2828 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
2829 | return -ECONNREFUSED; |
2830 | ||
0c1bc5c6 | 2831 | chan->mode = rfc.mode; |
6c2ea7a8 | 2832 | |
0e8b207e | 2833 | if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) { |
f2fcfcd6 GP |
2834 | switch (rfc.mode) { |
2835 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2836 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2837 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2838 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
66af7aaf AE |
2839 | |
2840 | if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) { | |
2841 | chan->local_msdu = le16_to_cpu(efs.msdu); | |
2842 | chan->local_sdu_itime = | |
2843 | le32_to_cpu(efs.sdu_itime); | |
2844 | chan->local_acc_lat = le32_to_cpu(efs.acc_lat); | |
2845 | chan->local_flush_to = | |
2846 | le32_to_cpu(efs.flush_to); | |
2847 | } | |
f2fcfcd6 | 2848 | break; |
66af7aaf | 2849 | |
f2fcfcd6 | 2850 | case L2CAP_MODE_STREAMING: |
47d1ec61 | 2851 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2852 | } |
2853 | } | |
2854 | ||
fe4128e0 | 2855 | req->dcid = cpu_to_le16(chan->dcid); |
f2fcfcd6 GP |
2856 | req->flags = cpu_to_le16(0x0000); |
2857 | ||
2858 | return ptr - data; | |
2859 | } | |
2860 | ||
fe4128e0 | 2861 | static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags) |
1da177e4 LT |
2862 | { |
2863 | struct l2cap_conf_rsp *rsp = data; | |
2864 | void *ptr = rsp->data; | |
1da177e4 | 2865 | |
fe4128e0 | 2866 | BT_DBG("chan %p", chan); |
1da177e4 | 2867 | |
fe4128e0 | 2868 | rsp->scid = cpu_to_le16(chan->dcid); |
5dee9e7c | 2869 | rsp->result = cpu_to_le16(result); |
aca3192c | 2870 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2871 | |
2872 | return ptr - data; | |
2873 | } | |
2874 | ||
8c1d787b | 2875 | void __l2cap_connect_rsp_defer(struct l2cap_chan *chan) |
710f9b0a GP |
2876 | { |
2877 | struct l2cap_conn_rsp rsp; | |
8c1d787b | 2878 | struct l2cap_conn *conn = chan->conn; |
710f9b0a GP |
2879 | u8 buf[128]; |
2880 | ||
fe4128e0 GP |
2881 | rsp.scid = cpu_to_le16(chan->dcid); |
2882 | rsp.dcid = cpu_to_le16(chan->scid); | |
710f9b0a GP |
2883 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
2884 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
2885 | l2cap_send_cmd(conn, chan->ident, | |
2886 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2887 | ||
c1360a1c | 2888 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
710f9b0a GP |
2889 | return; |
2890 | ||
710f9b0a GP |
2891 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2892 | l2cap_build_conf_req(chan, buf), buf); | |
2893 | chan->num_conf_req++; | |
2894 | } | |
2895 | ||
47d1ec61 | 2896 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 2897 | { |
7b1c0049 GP |
2898 | int type, olen; |
2899 | unsigned long val; | |
2900 | struct l2cap_conf_rfc rfc; | |
2901 | ||
47d1ec61 | 2902 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 2903 | |
0c1bc5c6 | 2904 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
2905 | return; |
2906 | ||
2907 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2908 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2909 | ||
2910 | switch (type) { | |
2911 | case L2CAP_CONF_RFC: | |
2912 | if (olen == sizeof(rfc)) | |
2913 | memcpy(&rfc, (void *)val, olen); | |
2914 | goto done; | |
2915 | } | |
2916 | } | |
2917 | ||
36e999a8 MM |
2918 | /* Use sane default values in case a misbehaving remote device |
2919 | * did not send an RFC option. | |
2920 | */ | |
2921 | rfc.mode = chan->mode; | |
2922 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
2923 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
2924 | rfc.max_pdu_size = cpu_to_le16(chan->imtu); | |
2925 | ||
2926 | BT_ERR("Expected RFC option was not found, using defaults"); | |
2927 | ||
7b1c0049 GP |
2928 | done: |
2929 | switch (rfc.mode) { | |
2930 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
2931 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2932 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
2933 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
2934 | break; |
2935 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 2936 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2937 | } |
2938 | } | |
2939 | ||
4e8402a3 MH |
2940 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2941 | { | |
e2fd318e | 2942 | struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data; |
4e8402a3 | 2943 | |
e2fd318e | 2944 | if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD) |
4e8402a3 MH |
2945 | return 0; |
2946 | ||
2947 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2948 | cmd->ident == conn->info_ident) { | |
17cd3f37 | 2949 | cancel_delayed_work(&conn->info_timer); |
984947dc MH |
2950 | |
2951 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2952 | conn->info_ident = 0; |
984947dc | 2953 | |
4e8402a3 MH |
2954 | l2cap_conn_start(conn); |
2955 | } | |
2956 | ||
2957 | return 0; | |
2958 | } | |
2959 | ||
1da177e4 LT |
2960 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2961 | { | |
1da177e4 LT |
2962 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2963 | struct l2cap_conn_rsp rsp; | |
23691d75 | 2964 | struct l2cap_chan *chan = NULL, *pchan; |
d793fe8c | 2965 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2966 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2967 | |
2968 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2969 | __le16 psm = req->psm; |
1da177e4 | 2970 | |
097db76c | 2971 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid); |
1da177e4 LT |
2972 | |
2973 | /* Check if we have socket listening on psm */ | |
c2287681 | 2974 | pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst); |
23691d75 | 2975 | if (!pchan) { |
1da177e4 LT |
2976 | result = L2CAP_CR_BAD_PSM; |
2977 | goto sendresp; | |
2978 | } | |
2979 | ||
23691d75 GP |
2980 | parent = pchan->sk; |
2981 | ||
3df91ea2 | 2982 | mutex_lock(&conn->chan_lock); |
aa2ac881 | 2983 | lock_sock(parent); |
e0f0cb56 | 2984 | |
e7c29cb1 MH |
2985 | /* Check if the ACL is secure enough (if not SDP) */ |
2986 | if (psm != cpu_to_le16(0x0001) && | |
2987 | !hci_conn_check_link_mode(conn->hcon)) { | |
9f5a0d7b | 2988 | conn->disc_reason = HCI_ERROR_AUTH_FAILURE; |
e7c29cb1 MH |
2989 | result = L2CAP_CR_SEC_BLOCK; |
2990 | goto response; | |
2991 | } | |
2992 | ||
1da177e4 LT |
2993 | result = L2CAP_CR_NO_MEM; |
2994 | ||
2995 | /* Check for backlog size */ | |
2996 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2997 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2998 | goto response; |
2999 | } | |
3000 | ||
80808e43 GP |
3001 | chan = pchan->ops->new_connection(pchan->data); |
3002 | if (!chan) | |
1da177e4 LT |
3003 | goto response; |
3004 | ||
80808e43 GP |
3005 | sk = chan->sk; |
3006 | ||
1da177e4 | 3007 | /* Check if we already have channel with that dcid */ |
baa7e1fa | 3008 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
1da177e4 | 3009 | sock_set_flag(sk, SOCK_ZAPPED); |
ba3bd0ee | 3010 | chan->ops->close(chan->data); |
1da177e4 LT |
3011 | goto response; |
3012 | } | |
3013 | ||
3014 | hci_conn_hold(conn->hcon); | |
3015 | ||
1da177e4 LT |
3016 | bacpy(&bt_sk(sk)->src, conn->src); |
3017 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
fe4128e0 GP |
3018 | chan->psm = psm; |
3019 | chan->dcid = scid; | |
1da177e4 | 3020 | |
d1010240 GP |
3021 | bt_accept_enqueue(parent, sk); |
3022 | ||
6be36555 | 3023 | __l2cap_chan_add(conn, chan); |
48454079 | 3024 | |
fe4128e0 | 3025 | dcid = chan->scid; |
1da177e4 | 3026 | |
c9b66675 | 3027 | __set_chan_timer(chan, sk->sk_sndtimeo); |
1da177e4 | 3028 | |
fc7f8a7e | 3029 | chan->ident = cmd->ident; |
1da177e4 | 3030 | |
984947dc | 3031 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
d45fc423 | 3032 | if (l2cap_chan_check_security(chan)) { |
f66dc81f | 3033 | if (bt_sk(sk)->defer_setup) { |
0e587be7 | 3034 | __l2cap_state_change(chan, BT_CONNECT2); |
f66dc81f MH |
3035 | result = L2CAP_CR_PEND; |
3036 | status = L2CAP_CS_AUTHOR_PEND; | |
3037 | parent->sk_data_ready(parent, 0); | |
3038 | } else { | |
0e587be7 | 3039 | __l2cap_state_change(chan, BT_CONFIG); |
f66dc81f MH |
3040 | result = L2CAP_CR_SUCCESS; |
3041 | status = L2CAP_CS_NO_INFO; | |
3042 | } | |
79d554a6 | 3043 | } else { |
0e587be7 | 3044 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3045 | result = L2CAP_CR_PEND; |
3046 | status = L2CAP_CS_AUTHEN_PEND; | |
3047 | } | |
3048 | } else { | |
0e587be7 | 3049 | __l2cap_state_change(chan, BT_CONNECT2); |
79d554a6 MH |
3050 | result = L2CAP_CR_PEND; |
3051 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
3052 | } |
3053 | ||
1da177e4 | 3054 | response: |
aa2ac881 | 3055 | release_sock(parent); |
3df91ea2 | 3056 | mutex_unlock(&conn->chan_lock); |
1da177e4 LT |
3057 | |
3058 | sendresp: | |
aca3192c YH |
3059 | rsp.scid = cpu_to_le16(scid); |
3060 | rsp.dcid = cpu_to_le16(dcid); | |
3061 | rsp.result = cpu_to_le16(result); | |
3062 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 3063 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
3064 | |
3065 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
3066 | struct l2cap_info_req info; | |
3067 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3068 | ||
3069 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
3070 | conn->info_ident = l2cap_get_ident(conn); | |
3071 | ||
ba13ccd9 | 3072 | schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT); |
79d554a6 MH |
3073 | |
3074 | l2cap_send_cmd(conn, conn->info_ident, | |
3075 | L2CAP_INFO_REQ, sizeof(info), &info); | |
3076 | } | |
3077 | ||
c1360a1c | 3078 | if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) && |
e9aeb2dd GP |
3079 | result == L2CAP_CR_SUCCESS) { |
3080 | u8 buf[128]; | |
c1360a1c | 3081 | set_bit(CONF_REQ_SENT, &chan->conf_state); |
e9aeb2dd | 3082 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3083 | l2cap_build_conf_req(chan, buf), buf); |
3084 | chan->num_conf_req++; | |
e9aeb2dd GP |
3085 | } |
3086 | ||
1da177e4 LT |
3087 | return 0; |
3088 | } | |
3089 | ||
3090 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3091 | { | |
3092 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
3093 | u16 scid, dcid, result, status; | |
48454079 | 3094 | struct l2cap_chan *chan; |
1da177e4 | 3095 | u8 req[128]; |
3df91ea2 | 3096 | int err; |
1da177e4 LT |
3097 | |
3098 | scid = __le16_to_cpu(rsp->scid); | |
3099 | dcid = __le16_to_cpu(rsp->dcid); | |
3100 | result = __le16_to_cpu(rsp->result); | |
3101 | status = __le16_to_cpu(rsp->status); | |
3102 | ||
1b009c98 AE |
3103 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", |
3104 | dcid, scid, result, status); | |
1da177e4 | 3105 | |
3df91ea2 AE |
3106 | mutex_lock(&conn->chan_lock); |
3107 | ||
1da177e4 | 3108 | if (scid) { |
3df91ea2 AE |
3109 | chan = __l2cap_get_chan_by_scid(conn, scid); |
3110 | if (!chan) { | |
3111 | err = -EFAULT; | |
3112 | goto unlock; | |
3113 | } | |
1da177e4 | 3114 | } else { |
3df91ea2 AE |
3115 | chan = __l2cap_get_chan_by_ident(conn, cmd->ident); |
3116 | if (!chan) { | |
3117 | err = -EFAULT; | |
3118 | goto unlock; | |
3119 | } | |
1da177e4 LT |
3120 | } |
3121 | ||
3df91ea2 AE |
3122 | err = 0; |
3123 | ||
6be36555 | 3124 | l2cap_chan_lock(chan); |
48454079 | 3125 | |
1da177e4 LT |
3126 | switch (result) { |
3127 | case L2CAP_CR_SUCCESS: | |
89bc500e | 3128 | l2cap_state_change(chan, BT_CONFIG); |
fc7f8a7e | 3129 | chan->ident = 0; |
fe4128e0 | 3130 | chan->dcid = dcid; |
c1360a1c | 3131 | clear_bit(CONF_CONNECT_PEND, &chan->conf_state); |
6a8d3010 | 3132 | |
c1360a1c | 3133 | if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) |
e9aeb2dd GP |
3134 | break; |
3135 | ||
1da177e4 | 3136 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3137 | l2cap_build_conf_req(chan, req), req); |
3138 | chan->num_conf_req++; | |
1da177e4 LT |
3139 | break; |
3140 | ||
3141 | case L2CAP_CR_PEND: | |
c1360a1c | 3142 | set_bit(CONF_CONNECT_PEND, &chan->conf_state); |
1da177e4 LT |
3143 | break; |
3144 | ||
3145 | default: | |
48454079 | 3146 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
3147 | break; |
3148 | } | |
3149 | ||
6be36555 | 3150 | l2cap_chan_unlock(chan); |
3df91ea2 AE |
3151 | |
3152 | unlock: | |
3153 | mutex_unlock(&conn->chan_lock); | |
3154 | ||
3155 | return err; | |
1da177e4 LT |
3156 | } |
3157 | ||
47d1ec61 | 3158 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 MM |
3159 | { |
3160 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
3161 | * sides request it. | |
3162 | */ | |
0c1bc5c6 | 3163 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 3164 | chan->fcs = L2CAP_FCS_NONE; |
c1360a1c | 3165 | else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) |
47d1ec61 | 3166 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
3167 | } |
3168 | ||
88219a0f | 3169 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
3170 | { |
3171 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
3172 | u16 dcid, flags; | |
3173 | u8 rsp[64]; | |
48454079 | 3174 | struct l2cap_chan *chan; |
3c588192 | 3175 | int len, err = 0; |
1da177e4 LT |
3176 | |
3177 | dcid = __le16_to_cpu(req->dcid); | |
3178 | flags = __le16_to_cpu(req->flags); | |
3179 | ||
3180 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
3181 | ||
baa7e1fa | 3182 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 3183 | if (!chan) |
1da177e4 LT |
3184 | return -ENOENT; |
3185 | ||
6be36555 | 3186 | l2cap_chan_lock(chan); |
48454079 | 3187 | |
033b1142 | 3188 | if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) { |
e2fd318e IK |
3189 | struct l2cap_cmd_rej_cid rej; |
3190 | ||
3191 | rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID); | |
3192 | rej.scid = cpu_to_le16(chan->scid); | |
3193 | rej.dcid = cpu_to_le16(chan->dcid); | |
df6bd743 | 3194 | |
df6bd743 GP |
3195 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, |
3196 | sizeof(rej), &rej); | |
354f60a9 | 3197 | goto unlock; |
df6bd743 | 3198 | } |
354f60a9 | 3199 | |
5dee9e7c | 3200 | /* Reject if config buffer is too small. */ |
88219a0f | 3201 | len = cmd_len - sizeof(*req); |
7ac28817 | 3202 | if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c | 3203 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
fe4128e0 | 3204 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c MH |
3205 | L2CAP_CONF_REJECT, flags), rsp); |
3206 | goto unlock; | |
3207 | } | |
3208 | ||
3209 | /* Store config. */ | |
73ffa904 GP |
3210 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
3211 | chan->conf_len += len; | |
1da177e4 LT |
3212 | |
3213 | if (flags & 0x0001) { | |
3214 | /* Incomplete config. Send empty response. */ | |
3215 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
fe4128e0 | 3216 | l2cap_build_conf_rsp(chan, rsp, |
5dee9e7c | 3217 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
1da177e4 LT |
3218 | goto unlock; |
3219 | } | |
3220 | ||
3221 | /* Complete config. */ | |
73ffa904 | 3222 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 3223 | if (len < 0) { |
e92c8e70 | 3224 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 3225 | goto unlock; |
f2fcfcd6 | 3226 | } |
1da177e4 | 3227 | |
5dee9e7c | 3228 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 3229 | chan->num_conf_rsp++; |
5dee9e7c | 3230 | |
5dee9e7c | 3231 | /* Reset config buffer. */ |
73ffa904 | 3232 | chan->conf_len = 0; |
5dee9e7c | 3233 | |
c1360a1c | 3234 | if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) |
876d9484 MH |
3235 | goto unlock; |
3236 | ||
c1360a1c | 3237 | if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3238 | set_default_fcs(chan); |
fcc203c3 | 3239 | |
89bc500e | 3240 | l2cap_state_change(chan, BT_CONNECTED); |
e90bac06 | 3241 | |
105bdf9e MM |
3242 | if (chan->mode == L2CAP_MODE_ERTM || |
3243 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 MM |
3244 | err = l2cap_ertm_init(chan); |
3245 | ||
3246 | if (err < 0) | |
3247 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3248 | else | |
3249 | l2cap_chan_ready(chan); | |
0565c1c2 | 3250 | |
876d9484 MH |
3251 | goto unlock; |
3252 | } | |
3253 | ||
c1360a1c | 3254 | if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) { |
79d554a6 | 3255 | u8 buf[64]; |
1da177e4 | 3256 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
3257 | l2cap_build_conf_req(chan, buf), buf); |
3258 | chan->num_conf_req++; | |
1da177e4 LT |
3259 | } |
3260 | ||
0e8b207e AE |
3261 | /* Got Conf Rsp PENDING from remote side and asume we sent |
3262 | Conf Rsp PENDING in the code above */ | |
3263 | if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) && | |
3264 | test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3265 | ||
3266 | /* check compatibility */ | |
3267 | ||
3268 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3269 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3270 | ||
3271 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3272 | l2cap_build_conf_rsp(chan, rsp, |
0e8b207e AE |
3273 | L2CAP_CONF_SUCCESS, 0x0000), rsp); |
3274 | } | |
3275 | ||
1da177e4 | 3276 | unlock: |
6be36555 | 3277 | l2cap_chan_unlock(chan); |
3c588192 | 3278 | return err; |
1da177e4 LT |
3279 | } |
3280 | ||
3281 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3282 | { | |
3283 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3284 | u16 scid, flags, result; | |
48454079 | 3285 | struct l2cap_chan *chan; |
61386cba | 3286 | int len = le16_to_cpu(cmd->len) - sizeof(*rsp); |
3c588192 | 3287 | int err = 0; |
1da177e4 LT |
3288 | |
3289 | scid = __le16_to_cpu(rsp->scid); | |
3290 | flags = __le16_to_cpu(rsp->flags); | |
3291 | result = __le16_to_cpu(rsp->result); | |
3292 | ||
61386cba AE |
3293 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags, |
3294 | result, len); | |
1da177e4 | 3295 | |
baa7e1fa | 3296 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 3297 | if (!chan) |
1da177e4 LT |
3298 | return 0; |
3299 | ||
6be36555 | 3300 | l2cap_chan_lock(chan); |
48454079 | 3301 | |
1da177e4 LT |
3302 | switch (result) { |
3303 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 3304 | l2cap_conf_rfc_get(chan, rsp->data, len); |
0e8b207e | 3305 | clear_bit(CONF_REM_CONF_PEND, &chan->conf_state); |
1da177e4 LT |
3306 | break; |
3307 | ||
0e8b207e AE |
3308 | case L2CAP_CONF_PENDING: |
3309 | set_bit(CONF_REM_CONF_PEND, &chan->conf_state); | |
3310 | ||
3311 | if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) { | |
3312 | char buf[64]; | |
3313 | ||
3314 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, | |
3315 | buf, &result); | |
3316 | if (len < 0) { | |
3317 | l2cap_send_disconn_req(conn, chan, ECONNRESET); | |
3318 | goto done; | |
3319 | } | |
3320 | ||
3321 | /* check compatibility */ | |
3322 | ||
3323 | clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state); | |
3324 | set_bit(CONF_OUTPUT_DONE, &chan->conf_state); | |
3325 | ||
3326 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
3e6b3b95 | 3327 | l2cap_build_conf_rsp(chan, buf, |
0e8b207e AE |
3328 | L2CAP_CONF_SUCCESS, 0x0000), buf); |
3329 | } | |
3330 | goto done; | |
3331 | ||
1da177e4 | 3332 | case L2CAP_CONF_UNACCEPT: |
73ffa904 | 3333 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3334 | char req[64]; |
3335 | ||
c2c77ec8 | 3336 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 3337 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
3338 | goto done; |
3339 | } | |
3340 | ||
f2fcfcd6 GP |
3341 | /* throw out any old stored conf requests */ |
3342 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
3343 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
3344 | req, &result); | |
f2fcfcd6 | 3345 | if (len < 0) { |
e92c8e70 | 3346 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
3347 | goto done; |
3348 | } | |
3349 | ||
3350 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3351 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 3352 | chan->num_conf_req++; |
f2fcfcd6 GP |
3353 | if (result != L2CAP_CONF_SUCCESS) |
3354 | goto done; | |
3355 | break; | |
1da177e4 LT |
3356 | } |
3357 | ||
8e87d142 | 3358 | default: |
6be36555 | 3359 | l2cap_chan_set_err(chan, ECONNRESET); |
2e0052e4 | 3360 | |
ba13ccd9 | 3361 | __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT); |
e92c8e70 | 3362 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
3363 | goto done; |
3364 | } | |
3365 | ||
3366 | if (flags & 0x01) | |
3367 | goto done; | |
3368 | ||
c1360a1c | 3369 | set_bit(CONF_INPUT_DONE, &chan->conf_state); |
1da177e4 | 3370 | |
c1360a1c | 3371 | if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { |
47d1ec61 | 3372 | set_default_fcs(chan); |
fcc203c3 | 3373 | |
89bc500e | 3374 | l2cap_state_change(chan, BT_CONNECTED); |
105bdf9e MM |
3375 | if (chan->mode == L2CAP_MODE_ERTM || |
3376 | chan->mode == L2CAP_MODE_STREAMING) | |
3c588192 | 3377 | err = l2cap_ertm_init(chan); |
0565c1c2 | 3378 | |
3c588192 MM |
3379 | if (err < 0) |
3380 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
3381 | else | |
3382 | l2cap_chan_ready(chan); | |
1da177e4 LT |
3383 | } |
3384 | ||
3385 | done: | |
6be36555 | 3386 | l2cap_chan_unlock(chan); |
3c588192 | 3387 | return err; |
1da177e4 LT |
3388 | } |
3389 | ||
3390 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3391 | { | |
3392 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3393 | struct l2cap_disconn_rsp rsp; | |
3394 | u16 dcid, scid; | |
48454079 | 3395 | struct l2cap_chan *chan; |
1da177e4 LT |
3396 | struct sock *sk; |
3397 | ||
3398 | scid = __le16_to_cpu(req->scid); | |
3399 | dcid = __le16_to_cpu(req->dcid); | |
3400 | ||
3401 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3402 | ||
3df91ea2 AE |
3403 | mutex_lock(&conn->chan_lock); |
3404 | ||
3405 | chan = __l2cap_get_chan_by_scid(conn, dcid); | |
3406 | if (!chan) { | |
3407 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3408 | return 0; |
3df91ea2 | 3409 | } |
1da177e4 | 3410 | |
6be36555 AE |
3411 | l2cap_chan_lock(chan); |
3412 | ||
48454079 GP |
3413 | sk = chan->sk; |
3414 | ||
fe4128e0 GP |
3415 | rsp.dcid = cpu_to_le16(chan->scid); |
3416 | rsp.scid = cpu_to_le16(chan->dcid); | |
1da177e4 LT |
3417 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3418 | ||
6be36555 | 3419 | lock_sock(sk); |
1da177e4 | 3420 | sk->sk_shutdown = SHUTDOWN_MASK; |
6be36555 | 3421 | release_sock(sk); |
1da177e4 | 3422 | |
61d6ef3e | 3423 | l2cap_chan_hold(chan); |
48454079 | 3424 | l2cap_chan_del(chan, ECONNRESET); |
6be36555 AE |
3425 | |
3426 | l2cap_chan_unlock(chan); | |
1da177e4 | 3427 | |
ba3bd0ee | 3428 | chan->ops->close(chan->data); |
61d6ef3e | 3429 | l2cap_chan_put(chan); |
3df91ea2 AE |
3430 | |
3431 | mutex_unlock(&conn->chan_lock); | |
3432 | ||
1da177e4 LT |
3433 | return 0; |
3434 | } | |
3435 | ||
3436 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3437 | { | |
3438 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3439 | u16 dcid, scid; | |
48454079 | 3440 | struct l2cap_chan *chan; |
1da177e4 LT |
3441 | |
3442 | scid = __le16_to_cpu(rsp->scid); | |
3443 | dcid = __le16_to_cpu(rsp->dcid); | |
3444 | ||
3445 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3446 | ||
3df91ea2 AE |
3447 | mutex_lock(&conn->chan_lock); |
3448 | ||
3449 | chan = __l2cap_get_chan_by_scid(conn, scid); | |
3450 | if (!chan) { | |
3451 | mutex_unlock(&conn->chan_lock); | |
1da177e4 | 3452 | return 0; |
3df91ea2 | 3453 | } |
1da177e4 | 3454 | |
6be36555 | 3455 | l2cap_chan_lock(chan); |
48454079 | 3456 | |
61d6ef3e | 3457 | l2cap_chan_hold(chan); |
48454079 | 3458 | l2cap_chan_del(chan, 0); |
6be36555 AE |
3459 | |
3460 | l2cap_chan_unlock(chan); | |
1da177e4 | 3461 | |
ba3bd0ee | 3462 | chan->ops->close(chan->data); |
61d6ef3e | 3463 | l2cap_chan_put(chan); |
3df91ea2 AE |
3464 | |
3465 | mutex_unlock(&conn->chan_lock); | |
3466 | ||
1da177e4 LT |
3467 | return 0; |
3468 | } | |
3469 | ||
3470 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3471 | { | |
3472 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3473 | u16 type; |
3474 | ||
3475 | type = __le16_to_cpu(req->type); | |
3476 | ||
3477 | BT_DBG("type 0x%4.4x", type); | |
3478 | ||
f0709e03 MH |
3479 | if (type == L2CAP_IT_FEAT_MASK) { |
3480 | u8 buf[8]; | |
44dd46de | 3481 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3482 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3483 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3484 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3485 | if (!disable_ertm) |
fcc203c3 GP |
3486 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3487 | | L2CAP_FEAT_FCS; | |
a5fd6f30 | 3488 | if (enable_hs) |
6327eb98 AE |
3489 | feat_mask |= L2CAP_FEAT_EXT_FLOW |
3490 | | L2CAP_FEAT_EXT_WINDOW; | |
a5fd6f30 | 3491 | |
1b7bf4ed | 3492 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3493 | l2cap_send_cmd(conn, cmd->ident, |
3494 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3495 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3496 | u8 buf[12]; | |
3497 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
50a147cd MM |
3498 | |
3499 | if (enable_hs) | |
3500 | l2cap_fixed_chan[0] |= L2CAP_FC_A2MP; | |
3501 | else | |
3502 | l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP; | |
3503 | ||
e1027a7c MH |
3504 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3505 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
c6337ea6 | 3506 | memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan)); |
e1027a7c MH |
3507 | l2cap_send_cmd(conn, cmd->ident, |
3508 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3509 | } else { |
3510 | struct l2cap_info_rsp rsp; | |
3511 | rsp.type = cpu_to_le16(type); | |
3512 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3513 | l2cap_send_cmd(conn, cmd->ident, | |
3514 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3515 | } | |
1da177e4 LT |
3516 | |
3517 | return 0; | |
3518 | } | |
3519 | ||
3520 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3521 | { | |
3522 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3523 | u16 type, result; | |
3524 | ||
3525 | type = __le16_to_cpu(rsp->type); | |
3526 | result = __le16_to_cpu(rsp->result); | |
3527 | ||
3528 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3529 | ||
e90165be AE |
3530 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
3531 | if (cmd->ident != conn->info_ident || | |
3532 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
3533 | return 0; | |
3534 | ||
17cd3f37 | 3535 | cancel_delayed_work(&conn->info_timer); |
4e8402a3 | 3536 | |
adb08ede VT |
3537 | if (result != L2CAP_IR_SUCCESS) { |
3538 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3539 | conn->info_ident = 0; | |
3540 | ||
3541 | l2cap_conn_start(conn); | |
3542 | ||
3543 | return 0; | |
3544 | } | |
3545 | ||
978c93b9 AE |
3546 | switch (type) { |
3547 | case L2CAP_IT_FEAT_MASK: | |
83985319 | 3548 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3549 | |
47ec1dcd | 3550 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3551 | struct l2cap_info_req req; |
3552 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3553 | ||
3554 | conn->info_ident = l2cap_get_ident(conn); | |
3555 | ||
3556 | l2cap_send_cmd(conn, conn->info_ident, | |
3557 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3558 | } else { | |
3559 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3560 | conn->info_ident = 0; | |
3561 | ||
3562 | l2cap_conn_start(conn); | |
3563 | } | |
978c93b9 AE |
3564 | break; |
3565 | ||
3566 | case L2CAP_IT_FIXED_CHAN: | |
3567 | conn->fixed_chan_mask = rsp->data[0]; | |
984947dc | 3568 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3569 | conn->info_ident = 0; |
984947dc MH |
3570 | |
3571 | l2cap_conn_start(conn); | |
978c93b9 | 3572 | break; |
984947dc | 3573 | } |
4e8402a3 | 3574 | |
1da177e4 LT |
3575 | return 0; |
3576 | } | |
3577 | ||
f94ff6ff MM |
3578 | static inline int l2cap_create_channel_req(struct l2cap_conn *conn, |
3579 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, | |
3580 | void *data) | |
3581 | { | |
3582 | struct l2cap_create_chan_req *req = data; | |
3583 | struct l2cap_create_chan_rsp rsp; | |
3584 | u16 psm, scid; | |
3585 | ||
3586 | if (cmd_len != sizeof(*req)) | |
3587 | return -EPROTO; | |
3588 | ||
3589 | if (!enable_hs) | |
3590 | return -EINVAL; | |
3591 | ||
3592 | psm = le16_to_cpu(req->psm); | |
3593 | scid = le16_to_cpu(req->scid); | |
3594 | ||
3595 | BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id); | |
3596 | ||
3597 | /* Placeholder: Always reject */ | |
3598 | rsp.dcid = 0; | |
3599 | rsp.scid = cpu_to_le16(scid); | |
8ce0c498 AE |
3600 | rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM); |
3601 | rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO); | |
f94ff6ff MM |
3602 | |
3603 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP, | |
3604 | sizeof(rsp), &rsp); | |
3605 | ||
3606 | return 0; | |
3607 | } | |
3608 | ||
3609 | static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn, | |
3610 | struct l2cap_cmd_hdr *cmd, void *data) | |
3611 | { | |
3612 | BT_DBG("conn %p", conn); | |
3613 | ||
3614 | return l2cap_connect_rsp(conn, cmd, data); | |
3615 | } | |
3616 | ||
8d5a04a1 MM |
3617 | static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident, |
3618 | u16 icid, u16 result) | |
3619 | { | |
3620 | struct l2cap_move_chan_rsp rsp; | |
3621 | ||
3622 | BT_DBG("icid %d, result %d", icid, result); | |
3623 | ||
3624 | rsp.icid = cpu_to_le16(icid); | |
3625 | rsp.result = cpu_to_le16(result); | |
3626 | ||
3627 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp); | |
3628 | } | |
3629 | ||
3630 | static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn, | |
3631 | struct l2cap_chan *chan, u16 icid, u16 result) | |
3632 | { | |
3633 | struct l2cap_move_chan_cfm cfm; | |
3634 | u8 ident; | |
3635 | ||
3636 | BT_DBG("icid %d, result %d", icid, result); | |
3637 | ||
3638 | ident = l2cap_get_ident(conn); | |
3639 | if (chan) | |
3640 | chan->ident = ident; | |
3641 | ||
3642 | cfm.icid = cpu_to_le16(icid); | |
3643 | cfm.result = cpu_to_le16(result); | |
3644 | ||
3645 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm); | |
3646 | } | |
3647 | ||
3648 | static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident, | |
3649 | u16 icid) | |
3650 | { | |
3651 | struct l2cap_move_chan_cfm_rsp rsp; | |
3652 | ||
3653 | BT_DBG("icid %d", icid); | |
3654 | ||
3655 | rsp.icid = cpu_to_le16(icid); | |
3656 | l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp); | |
3657 | } | |
3658 | ||
3659 | static inline int l2cap_move_channel_req(struct l2cap_conn *conn, | |
3660 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3661 | { | |
3662 | struct l2cap_move_chan_req *req = data; | |
3663 | u16 icid = 0; | |
3664 | u16 result = L2CAP_MR_NOT_ALLOWED; | |
3665 | ||
3666 | if (cmd_len != sizeof(*req)) | |
3667 | return -EPROTO; | |
3668 | ||
3669 | icid = le16_to_cpu(req->icid); | |
3670 | ||
3671 | BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id); | |
3672 | ||
3673 | if (!enable_hs) | |
3674 | return -EINVAL; | |
3675 | ||
3676 | /* Placeholder: Always refuse */ | |
3677 | l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result); | |
3678 | ||
3679 | return 0; | |
3680 | } | |
3681 | ||
3682 | static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn, | |
3683 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3684 | { | |
3685 | struct l2cap_move_chan_rsp *rsp = data; | |
3686 | u16 icid, result; | |
3687 | ||
3688 | if (cmd_len != sizeof(*rsp)) | |
3689 | return -EPROTO; | |
3690 | ||
3691 | icid = le16_to_cpu(rsp->icid); | |
3692 | result = le16_to_cpu(rsp->result); | |
3693 | ||
3694 | BT_DBG("icid %d, result %d", icid, result); | |
3695 | ||
3696 | /* Placeholder: Always unconfirmed */ | |
3697 | l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED); | |
3698 | ||
3699 | return 0; | |
3700 | } | |
3701 | ||
3702 | static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn, | |
3703 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3704 | { | |
3705 | struct l2cap_move_chan_cfm *cfm = data; | |
3706 | u16 icid, result; | |
3707 | ||
3708 | if (cmd_len != sizeof(*cfm)) | |
3709 | return -EPROTO; | |
3710 | ||
3711 | icid = le16_to_cpu(cfm->icid); | |
3712 | result = le16_to_cpu(cfm->result); | |
3713 | ||
3714 | BT_DBG("icid %d, result %d", icid, result); | |
3715 | ||
3716 | l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid); | |
3717 | ||
3718 | return 0; | |
3719 | } | |
3720 | ||
3721 | static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn, | |
3722 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data) | |
3723 | { | |
3724 | struct l2cap_move_chan_cfm_rsp *rsp = data; | |
3725 | u16 icid; | |
3726 | ||
3727 | if (cmd_len != sizeof(*rsp)) | |
3728 | return -EPROTO; | |
3729 | ||
3730 | icid = le16_to_cpu(rsp->icid); | |
3731 | ||
3732 | BT_DBG("icid %d", icid); | |
3733 | ||
3734 | return 0; | |
3735 | } | |
3736 | ||
e2174ca4 | 3737 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
3738 | u16 to_multiplier) |
3739 | { | |
3740 | u16 max_latency; | |
3741 | ||
3742 | if (min > max || min < 6 || max > 3200) | |
3743 | return -EINVAL; | |
3744 | ||
3745 | if (to_multiplier < 10 || to_multiplier > 3200) | |
3746 | return -EINVAL; | |
3747 | ||
3748 | if (max >= to_multiplier * 8) | |
3749 | return -EINVAL; | |
3750 | ||
3751 | max_latency = (to_multiplier * 8 / max) - 1; | |
3752 | if (latency > 499 || latency > max_latency) | |
3753 | return -EINVAL; | |
3754 | ||
3755 | return 0; | |
3756 | } | |
3757 | ||
3758 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
3759 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3760 | { | |
3761 | struct hci_conn *hcon = conn->hcon; | |
3762 | struct l2cap_conn_param_update_req *req; | |
3763 | struct l2cap_conn_param_update_rsp rsp; | |
3764 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 3765 | int err; |
de73115a CT |
3766 | |
3767 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
3768 | return -EINVAL; | |
3769 | ||
3770 | cmd_len = __le16_to_cpu(cmd->len); | |
3771 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
3772 | return -EPROTO; | |
3773 | ||
3774 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
3775 | min = __le16_to_cpu(req->min); |
3776 | max = __le16_to_cpu(req->max); | |
de73115a CT |
3777 | latency = __le16_to_cpu(req->latency); |
3778 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
3779 | ||
3780 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
3781 | min, max, latency, to_multiplier); | |
3782 | ||
3783 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
3784 | |
3785 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
3786 | if (err) | |
de73115a CT |
3787 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
3788 | else | |
3789 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
3790 | ||
3791 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
3792 | sizeof(rsp), &rsp); | |
3793 | ||
2ce603eb CT |
3794 | if (!err) |
3795 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
3796 | ||
de73115a CT |
3797 | return 0; |
3798 | } | |
3799 | ||
3300d9a9 CT |
3800 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
3801 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
3802 | { | |
3803 | int err = 0; | |
3804 | ||
3805 | switch (cmd->code) { | |
3806 | case L2CAP_COMMAND_REJ: | |
3807 | l2cap_command_rej(conn, cmd, data); | |
3808 | break; | |
3809 | ||
3810 | case L2CAP_CONN_REQ: | |
3811 | err = l2cap_connect_req(conn, cmd, data); | |
3812 | break; | |
3813 | ||
3814 | case L2CAP_CONN_RSP: | |
3815 | err = l2cap_connect_rsp(conn, cmd, data); | |
3816 | break; | |
3817 | ||
3818 | case L2CAP_CONF_REQ: | |
3819 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
3820 | break; | |
3821 | ||
3822 | case L2CAP_CONF_RSP: | |
3823 | err = l2cap_config_rsp(conn, cmd, data); | |
3824 | break; | |
3825 | ||
3826 | case L2CAP_DISCONN_REQ: | |
3827 | err = l2cap_disconnect_req(conn, cmd, data); | |
3828 | break; | |
3829 | ||
3830 | case L2CAP_DISCONN_RSP: | |
3831 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
3832 | break; | |
3833 | ||
3834 | case L2CAP_ECHO_REQ: | |
3835 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
3836 | break; | |
3837 | ||
3838 | case L2CAP_ECHO_RSP: | |
3839 | break; | |
3840 | ||
3841 | case L2CAP_INFO_REQ: | |
3842 | err = l2cap_information_req(conn, cmd, data); | |
3843 | break; | |
3844 | ||
3845 | case L2CAP_INFO_RSP: | |
3846 | err = l2cap_information_rsp(conn, cmd, data); | |
3847 | break; | |
3848 | ||
f94ff6ff MM |
3849 | case L2CAP_CREATE_CHAN_REQ: |
3850 | err = l2cap_create_channel_req(conn, cmd, cmd_len, data); | |
3851 | break; | |
3852 | ||
3853 | case L2CAP_CREATE_CHAN_RSP: | |
3854 | err = l2cap_create_channel_rsp(conn, cmd, data); | |
3855 | break; | |
3856 | ||
8d5a04a1 MM |
3857 | case L2CAP_MOVE_CHAN_REQ: |
3858 | err = l2cap_move_channel_req(conn, cmd, cmd_len, data); | |
3859 | break; | |
3860 | ||
3861 | case L2CAP_MOVE_CHAN_RSP: | |
3862 | err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data); | |
3863 | break; | |
3864 | ||
3865 | case L2CAP_MOVE_CHAN_CFM: | |
3866 | err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data); | |
3867 | break; | |
3868 | ||
3869 | case L2CAP_MOVE_CHAN_CFM_RSP: | |
3870 | err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data); | |
3871 | break; | |
3872 | ||
3300d9a9 CT |
3873 | default: |
3874 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
3875 | err = -EINVAL; | |
3876 | break; | |
3877 | } | |
3878 | ||
3879 | return err; | |
3880 | } | |
3881 | ||
3882 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
3883 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
3884 | { | |
3885 | switch (cmd->code) { | |
3886 | case L2CAP_COMMAND_REJ: | |
3887 | return 0; | |
3888 | ||
3889 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 3890 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
3891 | |
3892 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
3893 | return 0; | |
3894 | ||
3895 | default: | |
3896 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
3897 | return -EINVAL; | |
3898 | } | |
3899 | } | |
3900 | ||
3901 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
3902 | struct sk_buff *skb) | |
1da177e4 LT |
3903 | { |
3904 | u8 *data = skb->data; | |
3905 | int len = skb->len; | |
3906 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 3907 | int err; |
1da177e4 LT |
3908 | |
3909 | l2cap_raw_recv(conn, skb); | |
3910 | ||
3911 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3912 | u16 cmd_len; |
1da177e4 LT |
3913 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3914 | data += L2CAP_CMD_HDR_SIZE; | |
3915 | len -= L2CAP_CMD_HDR_SIZE; | |
3916 | ||
88219a0f | 3917 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3918 | |
88219a0f | 3919 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3920 | |
88219a0f | 3921 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3922 | BT_DBG("corrupted command"); |
3923 | break; | |
3924 | } | |
3925 | ||
3300d9a9 CT |
3926 | if (conn->hcon->type == LE_LINK) |
3927 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
3928 | else | |
3929 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
3930 | |
3931 | if (err) { | |
e2fd318e | 3932 | struct l2cap_cmd_rej_unk rej; |
2c6d1a2e GP |
3933 | |
3934 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
3935 | |
3936 | /* FIXME: Map err to a valid reason */ | |
e2fd318e | 3937 | rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD); |
1da177e4 LT |
3938 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3939 | } | |
3940 | ||
88219a0f AV |
3941 | data += cmd_len; |
3942 | len -= cmd_len; | |
1da177e4 LT |
3943 | } |
3944 | ||
3945 | kfree_skb(skb); | |
3946 | } | |
3947 | ||
47d1ec61 | 3948 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
3949 | { |
3950 | u16 our_fcs, rcv_fcs; | |
e4ca6d98 AE |
3951 | int hdr_size; |
3952 | ||
3953 | if (test_bit(FLAG_EXT_CTRL, &chan->flags)) | |
3954 | hdr_size = L2CAP_EXT_HDR_SIZE; | |
3955 | else | |
3956 | hdr_size = L2CAP_ENH_HDR_SIZE; | |
fcc203c3 | 3957 | |
47d1ec61 | 3958 | if (chan->fcs == L2CAP_FCS_CRC16) { |
03a51213 | 3959 | skb_trim(skb, skb->len - L2CAP_FCS_SIZE); |
fcc203c3 GP |
3960 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3961 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3962 | ||
3963 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3964 | return -EBADMSG; |
fcc203c3 GP |
3965 | } |
3966 | return 0; | |
3967 | } | |
3968 | ||
525cd185 | 3969 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 3970 | { |
88843ab0 | 3971 | u32 control = 0; |
d5392c8f | 3972 | |
6a026610 | 3973 | chan->frames_sent = 0; |
d5392c8f | 3974 | |
0b209fae | 3975 | control |= __set_reqseq(chan, chan->buffer_seq); |
d5392c8f | 3976 | |
e2ab4353 | 3977 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
ab784b73 | 3978 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR); |
525cd185 | 3979 | l2cap_send_sframe(chan, control); |
e2ab4353 | 3980 | set_bit(CONN_RNR_SENT, &chan->conn_state); |
d5392c8f GP |
3981 | } |
3982 | ||
e2ab4353 | 3983 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) |
525cd185 | 3984 | l2cap_retransmit_frames(chan); |
d5392c8f | 3985 | |
525cd185 | 3986 | l2cap_ertm_send(chan); |
d5392c8f | 3987 | |
e2ab4353 | 3988 | if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) && |
6a026610 | 3989 | chan->frames_sent == 0) { |
ab784b73 | 3990 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 3991 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
3992 | } |
3993 | } | |
3994 | ||
fb45de7d | 3995 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar) |
8f17154f GP |
3996 | { |
3997 | struct sk_buff *next_skb; | |
bfbacc11 | 3998 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f | 3999 | |
3ce3514f MM |
4000 | bt_cb(skb)->control.txseq = tx_seq; |
4001 | bt_cb(skb)->control.sar = sar; | |
8f17154f | 4002 | |
f1c6775b | 4003 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 4004 | |
836be934 | 4005 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
bfbacc11 | 4006 | |
039d9572 | 4007 | while (next_skb) { |
3ce3514f | 4008 | if (bt_cb(next_skb)->control.txseq == tx_seq) |
9b53350d JPRV |
4009 | return -EINVAL; |
4010 | ||
836be934 | 4011 | next_tx_seq_offset = __seq_offset(chan, |
3ce3514f | 4012 | bt_cb(next_skb)->control.txseq, chan->buffer_seq); |
bfbacc11 JPRV |
4013 | |
4014 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 4015 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 4016 | return 0; |
8f17154f GP |
4017 | } |
4018 | ||
f1c6775b | 4019 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
039d9572 SJ |
4020 | next_skb = NULL; |
4021 | else | |
4022 | next_skb = skb_queue_next(&chan->srej_q, next_skb); | |
4023 | } | |
8f17154f | 4024 | |
f1c6775b | 4025 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
4026 | |
4027 | return 0; | |
8f17154f GP |
4028 | } |
4029 | ||
84084a31 MM |
4030 | static void append_skb_frag(struct sk_buff *skb, |
4031 | struct sk_buff *new_frag, struct sk_buff **last_frag) | |
18778a63 | 4032 | { |
84084a31 MM |
4033 | /* skb->len reflects data in skb as well as all fragments |
4034 | * skb->data_len reflects only data in fragments | |
4035 | */ | |
4036 | if (!skb_has_frag_list(skb)) | |
4037 | skb_shinfo(skb)->frag_list = new_frag; | |
4038 | ||
4039 | new_frag->next = NULL; | |
4040 | ||
4041 | (*last_frag)->next = new_frag; | |
4042 | *last_frag = new_frag; | |
4043 | ||
4044 | skb->len += new_frag->len; | |
4045 | skb->data_len += new_frag->len; | |
4046 | skb->truesize += new_frag->truesize; | |
4047 | } | |
4048 | ||
88843ab0 | 4049 | static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control) |
84084a31 MM |
4050 | { |
4051 | int err = -EINVAL; | |
18778a63 | 4052 | |
7e0ef6ee AE |
4053 | switch (__get_ctrl_sar(chan, control)) { |
4054 | case L2CAP_SAR_UNSEGMENTED: | |
84084a31 MM |
4055 | if (chan->sdu) |
4056 | break; | |
18778a63 | 4057 | |
84084a31 MM |
4058 | err = chan->ops->recv(chan->data, skb); |
4059 | break; | |
18778a63 | 4060 | |
7e0ef6ee | 4061 | case L2CAP_SAR_START: |
84084a31 MM |
4062 | if (chan->sdu) |
4063 | break; | |
18778a63 | 4064 | |
6f61fd47 | 4065 | chan->sdu_len = get_unaligned_le16(skb->data); |
03a51213 | 4066 | skb_pull(skb, L2CAP_SDULEN_SIZE); |
18778a63 | 4067 | |
84084a31 MM |
4068 | if (chan->sdu_len > chan->imtu) { |
4069 | err = -EMSGSIZE; | |
4070 | break; | |
4071 | } | |
1890d36b | 4072 | |
84084a31 MM |
4073 | if (skb->len >= chan->sdu_len) |
4074 | break; | |
18778a63 | 4075 | |
84084a31 MM |
4076 | chan->sdu = skb; |
4077 | chan->sdu_last_frag = skb; | |
18778a63 | 4078 | |
84084a31 MM |
4079 | skb = NULL; |
4080 | err = 0; | |
18778a63 GP |
4081 | break; |
4082 | ||
7e0ef6ee | 4083 | case L2CAP_SAR_CONTINUE: |
6f61fd47 | 4084 | if (!chan->sdu) |
84084a31 | 4085 | break; |
18778a63 | 4086 | |
84084a31 MM |
4087 | append_skb_frag(chan->sdu, skb, |
4088 | &chan->sdu_last_frag); | |
4089 | skb = NULL; | |
18778a63 | 4090 | |
84084a31 MM |
4091 | if (chan->sdu->len >= chan->sdu_len) |
4092 | break; | |
4178ba46 | 4093 | |
84084a31 | 4094 | err = 0; |
18778a63 GP |
4095 | break; |
4096 | ||
7e0ef6ee | 4097 | case L2CAP_SAR_END: |
6f61fd47 | 4098 | if (!chan->sdu) |
84084a31 | 4099 | break; |
18778a63 | 4100 | |
84084a31 MM |
4101 | append_skb_frag(chan->sdu, skb, |
4102 | &chan->sdu_last_frag); | |
4103 | skb = NULL; | |
4178ba46 | 4104 | |
84084a31 MM |
4105 | if (chan->sdu->len != chan->sdu_len) |
4106 | break; | |
18778a63 | 4107 | |
84084a31 | 4108 | err = chan->ops->recv(chan->data, chan->sdu); |
1890d36b | 4109 | |
84084a31 MM |
4110 | if (!err) { |
4111 | /* Reassembly complete */ | |
4112 | chan->sdu = NULL; | |
4113 | chan->sdu_last_frag = NULL; | |
4114 | chan->sdu_len = 0; | |
1890d36b | 4115 | } |
18778a63 GP |
4116 | break; |
4117 | } | |
4118 | ||
84084a31 MM |
4119 | if (err) { |
4120 | kfree_skb(skb); | |
4121 | kfree_skb(chan->sdu); | |
4122 | chan->sdu = NULL; | |
4123 | chan->sdu_last_frag = NULL; | |
4124 | chan->sdu_len = 0; | |
4125 | } | |
18778a63 | 4126 | |
84084a31 | 4127 | return err; |
18778a63 GP |
4128 | } |
4129 | ||
26f880d2 | 4130 | static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan) |
712132eb | 4131 | { |
26f880d2 | 4132 | BT_DBG("chan %p, Enter local busy", chan); |
712132eb | 4133 | |
26f880d2 | 4134 | set_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
3c588192 | 4135 | l2cap_seq_list_clear(&chan->srej_list); |
26f880d2 | 4136 | |
77f918bc | 4137 | __set_ack_timer(chan); |
26f880d2 MM |
4138 | } |
4139 | ||
4140 | static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan) | |
4141 | { | |
88843ab0 | 4142 | u32 control; |
712132eb | 4143 | |
e2ab4353 | 4144 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) |
712132eb GP |
4145 | goto done; |
4146 | ||
0b209fae | 4147 | control = __set_reqseq(chan, chan->buffer_seq); |
e3781735 | 4148 | control |= __set_ctrl_poll(chan); |
ab784b73 | 4149 | control |= __set_ctrl_super(chan, L2CAP_SUPER_RR); |
525cd185 | 4150 | l2cap_send_sframe(chan, control); |
6a026610 | 4151 | chan->retry_count = 1; |
712132eb | 4152 | |
1a09bcb9 GP |
4153 | __clear_retrans_timer(chan); |
4154 | __set_monitor_timer(chan); | |
712132eb | 4155 | |
e2ab4353 | 4156 | set_bit(CONN_WAIT_F, &chan->conn_state); |
712132eb GP |
4157 | |
4158 | done: | |
e2ab4353 GP |
4159 | clear_bit(CONN_LOCAL_BUSY, &chan->conn_state); |
4160 | clear_bit(CONN_RNR_SENT, &chan->conn_state); | |
712132eb | 4161 | |
49208c9c | 4162 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
4163 | } |
4164 | ||
e328140f | 4165 | void l2cap_chan_busy(struct l2cap_chan *chan, int busy) |
1890d36b | 4166 | { |
e328140f MM |
4167 | if (chan->mode == L2CAP_MODE_ERTM) { |
4168 | if (busy) | |
4169 | l2cap_ertm_enter_local_busy(chan); | |
4170 | else | |
4171 | l2cap_ertm_exit_local_busy(chan); | |
1890d36b | 4172 | } |
1890d36b GP |
4173 | } |
4174 | ||
fb45de7d | 4175 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f GP |
4176 | { |
4177 | struct sk_buff *skb; | |
88843ab0 | 4178 | u32 control; |
8f17154f | 4179 | |
e328140f MM |
4180 | while ((skb = skb_peek(&chan->srej_q)) && |
4181 | !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { | |
4182 | int err; | |
4183 | ||
3ce3514f | 4184 | if (bt_cb(skb)->control.txseq != tx_seq) |
8f17154f GP |
4185 | break; |
4186 | ||
f1c6775b | 4187 | skb = skb_dequeue(&chan->srej_q); |
3ce3514f | 4188 | control = __set_ctrl_sar(chan, bt_cb(skb)->control.sar); |
84084a31 | 4189 | err = l2cap_reassemble_sdu(chan, skb, control); |
e328140f MM |
4190 | |
4191 | if (err < 0) { | |
4192 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4193 | break; | |
4194 | } | |
4195 | ||
836be934 AE |
4196 | chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej); |
4197 | tx_seq = __next_seq(chan, tx_seq); | |
8f17154f GP |
4198 | } |
4199 | } | |
4200 | ||
fb45de7d | 4201 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 4202 | { |
8f17154f | 4203 | struct srej_list *l, *tmp; |
88843ab0 | 4204 | u32 control; |
8f17154f | 4205 | |
39d5a3ee | 4206 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
4207 | if (l->tx_seq == tx_seq) { |
4208 | list_del(&l->list); | |
4209 | kfree(l); | |
4210 | return; | |
4211 | } | |
ab784b73 | 4212 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 4213 | control |= __set_reqseq(chan, l->tx_seq); |
525cd185 | 4214 | l2cap_send_sframe(chan, control); |
8f17154f | 4215 | list_del(&l->list); |
39d5a3ee | 4216 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
4217 | } |
4218 | } | |
4219 | ||
aef89f21 | 4220 | static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq) |
8f17154f | 4221 | { |
8f17154f | 4222 | struct srej_list *new; |
88843ab0 | 4223 | u32 control; |
8f17154f | 4224 | |
42e5c802 | 4225 | while (tx_seq != chan->expected_tx_seq) { |
ab784b73 | 4226 | control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ); |
0b209fae | 4227 | control |= __set_reqseq(chan, chan->expected_tx_seq); |
3c588192 | 4228 | l2cap_seq_list_append(&chan->srej_list, chan->expected_tx_seq); |
525cd185 | 4229 | l2cap_send_sframe(chan, control); |
8f17154f GP |
4230 | |
4231 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
aef89f21 SJ |
4232 | if (!new) |
4233 | return -ENOMEM; | |
4234 | ||
42e5c802 | 4235 | new->tx_seq = chan->expected_tx_seq; |
836be934 AE |
4236 | |
4237 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
4238 | ||
39d5a3ee | 4239 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 4240 | } |
836be934 AE |
4241 | |
4242 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); | |
aef89f21 SJ |
4243 | |
4244 | return 0; | |
8f17154f GP |
4245 | } |
4246 | ||
88843ab0 | 4247 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
1c2acffb | 4248 | { |
fb45de7d | 4249 | u16 tx_seq = __get_txseq(chan, rx_control); |
0b209fae | 4250 | u16 req_seq = __get_reqseq(chan, rx_control); |
7e0ef6ee | 4251 | u8 sar = __get_ctrl_sar(chan, rx_control); |
f6337c77 | 4252 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 4253 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
4254 | int err = 0; |
4255 | ||
88843ab0 | 4256 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len, |
525cd185 | 4257 | tx_seq, rx_control); |
1c2acffb | 4258 | |
03f6715d | 4259 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4260 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4261 | __clear_monitor_timer(chan); |
6a026610 | 4262 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4263 | __set_retrans_timer(chan); |
e2ab4353 | 4264 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
1d8f5d16 GP |
4265 | } |
4266 | ||
42e5c802 GP |
4267 | chan->expected_ack_seq = req_seq; |
4268 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 4269 | |
836be934 | 4270 | tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq); |
9b53350d JPRV |
4271 | |
4272 | /* invalid tx_seq */ | |
47d1ec61 | 4273 | if (tx_seq_offset >= chan->tx_win) { |
8c1d787b | 4274 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
9b53350d JPRV |
4275 | goto drop; |
4276 | } | |
4277 | ||
77f918bc SJ |
4278 | if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) { |
4279 | if (!test_bit(CONN_RNR_SENT, &chan->conn_state)) | |
4280 | l2cap_send_ack(chan); | |
1890d36b | 4281 | goto drop; |
77f918bc | 4282 | } |
1890d36b | 4283 | |
02f1b641 MM |
4284 | if (tx_seq == chan->expected_tx_seq) |
4285 | goto expected; | |
4286 | ||
e2ab4353 | 4287 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
8f17154f | 4288 | struct srej_list *first; |
30afb5b2 | 4289 | |
39d5a3ee | 4290 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
4291 | struct srej_list, list); |
4292 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 4293 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 4294 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
4295 | |
4296 | list_del(&first->list); | |
4297 | kfree(first); | |
4298 | ||
39d5a3ee | 4299 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 4300 | chan->buffer_seq = chan->buffer_seq_srej; |
e2ab4353 | 4301 | clear_bit(CONN_SREJ_SENT, &chan->conn_state); |
525cd185 | 4302 | l2cap_send_ack(chan); |
49208c9c | 4303 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
4304 | } |
4305 | } else { | |
4306 | struct srej_list *l; | |
9b53350d JPRV |
4307 | |
4308 | /* duplicated tx_seq */ | |
42e5c802 | 4309 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 4310 | goto drop; |
8f17154f | 4311 | |
39d5a3ee | 4312 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 4313 | if (l->tx_seq == tx_seq) { |
525cd185 | 4314 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
4315 | return 0; |
4316 | } | |
4317 | } | |
aef89f21 SJ |
4318 | |
4319 | err = l2cap_send_srejframe(chan, tx_seq); | |
4320 | if (err < 0) { | |
4321 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4322 | return err; | |
4323 | } | |
30afb5b2 GP |
4324 | } |
4325 | } else { | |
836be934 AE |
4326 | expected_tx_seq_offset = __seq_offset(chan, |
4327 | chan->expected_tx_seq, chan->buffer_seq); | |
9b53350d JPRV |
4328 | |
4329 | /* duplicated tx_seq */ | |
4330 | if (tx_seq_offset < expected_tx_seq_offset) | |
4331 | goto drop; | |
4332 | ||
e2ab4353 | 4333 | set_bit(CONN_SREJ_SENT, &chan->conn_state); |
1c2acffb | 4334 | |
49208c9c | 4335 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 4336 | |
39d5a3ee | 4337 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 4338 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 4339 | |
f1c6775b | 4340 | __skb_queue_head_init(&chan->srej_q); |
42e5c802 | 4341 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 4342 | |
0ef3ef0f SJ |
4343 | /* Set P-bit only if there are some I-frames to ack. */ |
4344 | if (__clear_ack_timer(chan)) | |
4345 | set_bit(CONN_SEND_PBIT, &chan->conn_state); | |
ef54fd93 | 4346 | |
aef89f21 SJ |
4347 | err = l2cap_send_srejframe(chan, tx_seq); |
4348 | if (err < 0) { | |
4349 | l2cap_send_disconn_req(chan->conn, chan, -err); | |
4350 | return err; | |
4351 | } | |
1c2acffb | 4352 | } |
30afb5b2 GP |
4353 | return 0; |
4354 | ||
8f17154f | 4355 | expected: |
836be934 | 4356 | chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq); |
8f17154f | 4357 | |
e2ab4353 | 4358 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
3ce3514f MM |
4359 | bt_cb(skb)->control.txseq = tx_seq; |
4360 | bt_cb(skb)->control.sar = sar; | |
f1c6775b | 4361 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
4362 | return 0; |
4363 | } | |
4364 | ||
84084a31 | 4365 | err = l2cap_reassemble_sdu(chan, skb, rx_control); |
836be934 AE |
4366 | chan->buffer_seq = __next_seq(chan, chan->buffer_seq); |
4367 | ||
e328140f MM |
4368 | if (err < 0) { |
4369 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
4370 | return err; | |
4371 | } | |
2ece3684 | 4372 | |
03f6715d | 4373 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4374 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4375 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
4376 | } |
4377 | ||
c1b4f43b | 4378 | |
6a026610 GP |
4379 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
4380 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 4381 | l2cap_send_ack(chan); |
4d611e4d GP |
4382 | else |
4383 | __set_ack_timer(chan); | |
9e917af1 | 4384 | |
8f17154f | 4385 | return 0; |
9b53350d JPRV |
4386 | |
4387 | drop: | |
4388 | kfree_skb(skb); | |
4389 | return 0; | |
1c2acffb GP |
4390 | } |
4391 | ||
88843ab0 | 4392 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control) |
1c2acffb | 4393 | { |
88843ab0 | 4394 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, |
0b209fae | 4395 | __get_reqseq(chan, rx_control), rx_control); |
0e98958d | 4396 | |
0b209fae | 4397 | chan->expected_ack_seq = __get_reqseq(chan, rx_control); |
42e5c802 | 4398 | l2cap_drop_acked_frames(chan); |
1c2acffb | 4399 | |
e3781735 | 4400 | if (__is_ctrl_poll(chan, rx_control)) { |
e2ab4353 GP |
4401 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
4402 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) { | |
4403 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && | |
6a026610 | 4404 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4405 | __set_retrans_timer(chan); |
05fbd89d | 4406 | |
e2ab4353 | 4407 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
525cd185 | 4408 | l2cap_send_srejtail(chan); |
05fbd89d | 4409 | } else { |
525cd185 | 4410 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 4411 | } |
1d8f5d16 | 4412 | |
03f6715d | 4413 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4414 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4ec10d97 | 4415 | |
e2ab4353 | 4416 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4417 | l2cap_retransmit_frames(chan); |
2246b2f1 | 4418 | |
e072745f | 4419 | } else { |
e2ab4353 | 4420 | if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) && |
6a026610 | 4421 | (chan->unacked_frames > 0)) |
1a09bcb9 | 4422 | __set_retrans_timer(chan); |
1c2acffb | 4423 | |
e2ab4353 GP |
4424 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
4425 | if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) | |
525cd185 | 4426 | l2cap_send_ack(chan); |
894718a6 | 4427 | else |
525cd185 | 4428 | l2cap_ertm_send(chan); |
e072745f GP |
4429 | } |
4430 | } | |
2246b2f1 | 4431 | |
88843ab0 | 4432 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4433 | { |
0b209fae | 4434 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4435 | |
88843ab0 | 4436 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4437 | |
e2ab4353 | 4438 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
e072745f | 4439 | |
42e5c802 GP |
4440 | chan->expected_ack_seq = tx_seq; |
4441 | l2cap_drop_acked_frames(chan); | |
e072745f | 4442 | |
03f6715d | 4443 | if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4444 | if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state)) |
525cd185 | 4445 | l2cap_retransmit_frames(chan); |
e072745f | 4446 | } else { |
525cd185 | 4447 | l2cap_retransmit_frames(chan); |
30afb5b2 | 4448 | |
e2ab4353 GP |
4449 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) |
4450 | set_bit(CONN_REJ_ACT, &chan->conn_state); | |
e072745f GP |
4451 | } |
4452 | } | |
88843ab0 | 4453 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4454 | { |
0b209fae | 4455 | u16 tx_seq = __get_reqseq(chan, rx_control); |
30afb5b2 | 4456 | |
88843ab0 | 4457 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4458 | |
e2ab4353 | 4459 | clear_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
2246b2f1 | 4460 | |
e3781735 | 4461 | if (__is_ctrl_poll(chan, rx_control)) { |
42e5c802 GP |
4462 | chan->expected_ack_seq = tx_seq; |
4463 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 4464 | |
e2ab4353 | 4465 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
525cd185 | 4466 | l2cap_retransmit_one_frame(chan, tx_seq); |
dfc909be | 4467 | |
525cd185 | 4468 | l2cap_ertm_send(chan); |
dfc909be | 4469 | |
e2ab4353 | 4470 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4471 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4472 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4473 | } |
03f6715d | 4474 | } else if (__is_ctrl_final(chan, rx_control)) { |
e2ab4353 | 4475 | if (test_bit(CONN_SREJ_ACT, &chan->conn_state) && |
6a026610 | 4476 | chan->srej_save_reqseq == tx_seq) |
e2ab4353 | 4477 | clear_bit(CONN_SREJ_ACT, &chan->conn_state); |
e072745f | 4478 | else |
525cd185 | 4479 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 4480 | } else { |
525cd185 | 4481 | l2cap_retransmit_one_frame(chan, tx_seq); |
e2ab4353 | 4482 | if (test_bit(CONN_WAIT_F, &chan->conn_state)) { |
6a026610 | 4483 | chan->srej_save_reqseq = tx_seq; |
e2ab4353 | 4484 | set_bit(CONN_SREJ_ACT, &chan->conn_state); |
ef54fd93 | 4485 | } |
e072745f GP |
4486 | } |
4487 | } | |
4488 | ||
88843ab0 | 4489 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control) |
e072745f | 4490 | { |
0b209fae | 4491 | u16 tx_seq = __get_reqseq(chan, rx_control); |
e072745f | 4492 | |
88843ab0 | 4493 | BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control); |
0e98958d | 4494 | |
e2ab4353 | 4495 | set_bit(CONN_REMOTE_BUSY, &chan->conn_state); |
42e5c802 GP |
4496 | chan->expected_ack_seq = tx_seq; |
4497 | l2cap_drop_acked_frames(chan); | |
e072745f | 4498 | |
e3781735 | 4499 | if (__is_ctrl_poll(chan, rx_control)) |
e2ab4353 | 4500 | set_bit(CONN_SEND_FBIT, &chan->conn_state); |
3cb123d1 | 4501 | |
e2ab4353 | 4502 | if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) { |
1a09bcb9 | 4503 | __clear_retrans_timer(chan); |
e3781735 | 4504 | if (__is_ctrl_poll(chan, rx_control)) |
525cd185 | 4505 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 4506 | return; |
e072745f | 4507 | } |
99b0d4b7 | 4508 | |
e3781735 | 4509 | if (__is_ctrl_poll(chan, rx_control)) { |
525cd185 | 4510 | l2cap_send_srejtail(chan); |
ab784b73 AE |
4511 | } else { |
4512 | rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR); | |
4513 | l2cap_send_sframe(chan, rx_control); | |
4514 | } | |
e072745f GP |
4515 | } |
4516 | ||
88843ab0 | 4517 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb) |
e072745f | 4518 | { |
88843ab0 | 4519 | BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len); |
e072745f | 4520 | |
03f6715d | 4521 | if (__is_ctrl_final(chan, rx_control) && |
e2ab4353 | 4522 | test_bit(CONN_WAIT_F, &chan->conn_state)) { |
1a09bcb9 | 4523 | __clear_monitor_timer(chan); |
6a026610 | 4524 | if (chan->unacked_frames > 0) |
1a09bcb9 | 4525 | __set_retrans_timer(chan); |
e2ab4353 | 4526 | clear_bit(CONN_WAIT_F, &chan->conn_state); |
e072745f GP |
4527 | } |
4528 | ||
ab784b73 AE |
4529 | switch (__get_ctrl_super(chan, rx_control)) { |
4530 | case L2CAP_SUPER_RR: | |
525cd185 | 4531 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
4532 | break; |
4533 | ||
ab784b73 | 4534 | case L2CAP_SUPER_REJ: |
525cd185 | 4535 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 4536 | break; |
2246b2f1 | 4537 | |
ab784b73 | 4538 | case L2CAP_SUPER_SREJ: |
525cd185 | 4539 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
4540 | break; |
4541 | ||
ab784b73 | 4542 | case L2CAP_SUPER_RNR: |
525cd185 | 4543 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
4544 | break; |
4545 | } | |
4546 | ||
faaebd19 | 4547 | kfree_skb(skb); |
1c2acffb GP |
4548 | return 0; |
4549 | } | |
4550 | ||
cad8f1d0 | 4551 | static int l2cap_ertm_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb) |
218bb9df | 4552 | { |
88843ab0 | 4553 | u32 control; |
0b209fae | 4554 | u16 req_seq; |
218bb9df GP |
4555 | int len, next_tx_seq_offset, req_seq_offset; |
4556 | ||
b76bbd66 MM |
4557 | __unpack_control(chan, skb); |
4558 | ||
88843ab0 AE |
4559 | control = __get_control(chan, skb->data); |
4560 | skb_pull(skb, __ctrl_size(chan)); | |
218bb9df GP |
4561 | len = skb->len; |
4562 | ||
4563 | /* | |
4564 | * We can just drop the corrupted I-frame here. | |
4565 | * Receiver will miss it and start proper recovery | |
4566 | * procedures and ask retransmission. | |
4567 | */ | |
47d1ec61 | 4568 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
4569 | goto drop; |
4570 | ||
793c2f1c | 4571 | if (__is_sar_start(chan, control) && !__is_sframe(chan, control)) |
03a51213 | 4572 | len -= L2CAP_SDULEN_SIZE; |
218bb9df | 4573 | |
47d1ec61 | 4574 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4575 | len -= L2CAP_FCS_SIZE; |
218bb9df | 4576 | |
47d1ec61 | 4577 | if (len > chan->mps) { |
8c1d787b | 4578 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4579 | goto drop; |
4580 | } | |
4581 | ||
0b209fae | 4582 | req_seq = __get_reqseq(chan, control); |
218bb9df | 4583 | |
836be934 AE |
4584 | req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq); |
4585 | ||
4586 | next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq, | |
4587 | chan->expected_ack_seq); | |
218bb9df GP |
4588 | |
4589 | /* check for invalid req-seq */ | |
4590 | if (req_seq_offset > next_tx_seq_offset) { | |
8c1d787b | 4591 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4592 | goto drop; |
4593 | } | |
4594 | ||
793c2f1c | 4595 | if (!__is_sframe(chan, control)) { |
218bb9df | 4596 | if (len < 0) { |
8c1d787b | 4597 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4598 | goto drop; |
4599 | } | |
4600 | ||
525cd185 | 4601 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
4602 | } else { |
4603 | if (len != 0) { | |
4604 | BT_ERR("%d", len); | |
8c1d787b | 4605 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); |
218bb9df GP |
4606 | goto drop; |
4607 | } | |
4608 | ||
525cd185 | 4609 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
4610 | } |
4611 | ||
4612 | return 0; | |
4613 | ||
4614 | drop: | |
4615 | kfree_skb(skb); | |
4616 | return 0; | |
4617 | } | |
4618 | ||
1da177e4 LT |
4619 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4620 | { | |
48454079 | 4621 | struct l2cap_chan *chan; |
88843ab0 | 4622 | u32 control; |
fb45de7d | 4623 | u16 tx_seq; |
218bb9df | 4624 | int len; |
1da177e4 | 4625 | |
baa7e1fa | 4626 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 4627 | if (!chan) { |
1da177e4 | 4628 | BT_DBG("unknown cid 0x%4.4x", cid); |
6be36555 | 4629 | /* Drop packet and return */ |
3379013b | 4630 | kfree_skb(skb); |
6be36555 | 4631 | return 0; |
1da177e4 LT |
4632 | } |
4633 | ||
6be36555 | 4634 | l2cap_chan_lock(chan); |
6840ed07 | 4635 | |
49208c9c | 4636 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4637 | |
89bc500e | 4638 | if (chan->state != BT_CONNECTED) |
1da177e4 LT |
4639 | goto drop; |
4640 | ||
0c1bc5c6 | 4641 | switch (chan->mode) { |
1c2acffb GP |
4642 | case L2CAP_MODE_BASIC: |
4643 | /* If socket recv buffers overflows we drop data here | |
4644 | * which is *bad* because L2CAP has to be reliable. | |
4645 | * But we don't have any other choice. L2CAP doesn't | |
4646 | * provide flow control mechanism. */ | |
1da177e4 | 4647 | |
0c1bc5c6 | 4648 | if (chan->imtu < skb->len) |
1c2acffb | 4649 | goto drop; |
1da177e4 | 4650 | |
23070494 | 4651 | if (!chan->ops->recv(chan->data, skb)) |
1c2acffb GP |
4652 | goto done; |
4653 | break; | |
4654 | ||
4655 | case L2CAP_MODE_ERTM: | |
5ef8cb9e | 4656 | l2cap_ertm_data_rcv(chan, skb); |
1c2acffb | 4657 | |
fcafde2e | 4658 | goto done; |
1c2acffb | 4659 | |
6840ed07 | 4660 | case L2CAP_MODE_STREAMING: |
88843ab0 AE |
4661 | control = __get_control(chan, skb->data); |
4662 | skb_pull(skb, __ctrl_size(chan)); | |
6840ed07 GP |
4663 | len = skb->len; |
4664 | ||
47d1ec61 | 4665 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
4666 | goto drop; |
4667 | ||
7e0ef6ee | 4668 | if (__is_sar_start(chan, control)) |
03a51213 | 4669 | len -= L2CAP_SDULEN_SIZE; |
6840ed07 | 4670 | |
47d1ec61 | 4671 | if (chan->fcs == L2CAP_FCS_CRC16) |
03a51213 | 4672 | len -= L2CAP_FCS_SIZE; |
fcc203c3 | 4673 | |
793c2f1c | 4674 | if (len > chan->mps || len < 0 || __is_sframe(chan, control)) |
6840ed07 GP |
4675 | goto drop; |
4676 | ||
fb45de7d | 4677 | tx_seq = __get_txseq(chan, control); |
6840ed07 | 4678 | |
84084a31 MM |
4679 | if (chan->expected_tx_seq != tx_seq) { |
4680 | /* Frame(s) missing - must discard partial SDU */ | |
4681 | kfree_skb(chan->sdu); | |
4682 | chan->sdu = NULL; | |
4683 | chan->sdu_last_frag = NULL; | |
4684 | chan->sdu_len = 0; | |
6840ed07 | 4685 | |
84084a31 MM |
4686 | /* TODO: Notify userland of missing data */ |
4687 | } | |
4688 | ||
836be934 | 4689 | chan->expected_tx_seq = __next_seq(chan, tx_seq); |
84084a31 MM |
4690 | |
4691 | if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE) | |
4692 | l2cap_send_disconn_req(chan->conn, chan, ECONNRESET); | |
6840ed07 GP |
4693 | |
4694 | goto done; | |
4695 | ||
1c2acffb | 4696 | default: |
0c1bc5c6 | 4697 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
4698 | break; |
4699 | } | |
1da177e4 LT |
4700 | |
4701 | drop: | |
4702 | kfree_skb(skb); | |
4703 | ||
4704 | done: | |
6be36555 | 4705 | l2cap_chan_unlock(chan); |
0139418c | 4706 | |
1da177e4 LT |
4707 | return 0; |
4708 | } | |
4709 | ||
8e036fc3 | 4710 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 | 4711 | { |
23691d75 | 4712 | struct l2cap_chan *chan; |
1da177e4 | 4713 | |
c2287681 | 4714 | chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst); |
23691d75 | 4715 | if (!chan) |
1da177e4 LT |
4716 | goto drop; |
4717 | ||
5b4cedaa | 4718 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 | 4719 | |
89bc500e | 4720 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
1da177e4 LT |
4721 | goto drop; |
4722 | ||
e13e21dc | 4723 | if (chan->imtu < skb->len) |
1da177e4 LT |
4724 | goto drop; |
4725 | ||
23070494 | 4726 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4727 | return 0; |
1da177e4 LT |
4728 | |
4729 | drop: | |
4730 | kfree_skb(skb); | |
4731 | ||
1da177e4 LT |
4732 | return 0; |
4733 | } | |
4734 | ||
d9b88702 AE |
4735 | static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid, |
4736 | struct sk_buff *skb) | |
9f69bda6 | 4737 | { |
23691d75 | 4738 | struct l2cap_chan *chan; |
9f69bda6 | 4739 | |
c2287681 | 4740 | chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst); |
23691d75 | 4741 | if (!chan) |
9f69bda6 GP |
4742 | goto drop; |
4743 | ||
5b4cedaa | 4744 | BT_DBG("chan %p, len %d", chan, skb->len); |
9f69bda6 | 4745 | |
89bc500e | 4746 | if (chan->state != BT_BOUND && chan->state != BT_CONNECTED) |
9f69bda6 GP |
4747 | goto drop; |
4748 | ||
e13e21dc | 4749 | if (chan->imtu < skb->len) |
9f69bda6 GP |
4750 | goto drop; |
4751 | ||
23070494 | 4752 | if (!chan->ops->recv(chan->data, skb)) |
5b4cedaa | 4753 | return 0; |
9f69bda6 GP |
4754 | |
4755 | drop: | |
4756 | kfree_skb(skb); | |
4757 | ||
9f69bda6 GP |
4758 | return 0; |
4759 | } | |
4760 | ||
1da177e4 LT |
4761 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
4762 | { | |
4763 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4764 | u16 cid, len; |
4765 | __le16 psm; | |
1da177e4 LT |
4766 | |
4767 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4768 | cid = __le16_to_cpu(lh->cid); | |
4769 | len = __le16_to_cpu(lh->len); | |
4770 | ||
1c2acffb GP |
4771 | if (len != skb->len) { |
4772 | kfree_skb(skb); | |
4773 | return; | |
4774 | } | |
4775 | ||
1da177e4 LT |
4776 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4777 | ||
4778 | switch (cid) { | |
3300d9a9 | 4779 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 4780 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4781 | l2cap_sig_channel(conn, skb); |
4782 | break; | |
4783 | ||
8db4dc46 | 4784 | case L2CAP_CID_CONN_LESS: |
097db76c | 4785 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
4786 | skb_pull(skb, 2); |
4787 | l2cap_conless_channel(conn, psm, skb); | |
4788 | break; | |
4789 | ||
9f69bda6 GP |
4790 | case L2CAP_CID_LE_DATA: |
4791 | l2cap_att_channel(conn, cid, skb); | |
4792 | break; | |
4793 | ||
b501d6a1 AB |
4794 | case L2CAP_CID_SMP: |
4795 | if (smp_sig_channel(conn, skb)) | |
4796 | l2cap_conn_del(conn->hcon, EACCES); | |
4797 | break; | |
4798 | ||
1da177e4 LT |
4799 | default: |
4800 | l2cap_data_channel(conn, cid, skb); | |
4801 | break; | |
4802 | } | |
4803 | } | |
4804 | ||
4805 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4806 | ||
686ebf28 | 4807 | int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr) |
1da177e4 LT |
4808 | { |
4809 | int exact = 0, lm1 = 0, lm2 = 0; | |
23691d75 | 4810 | struct l2cap_chan *c; |
1da177e4 | 4811 | |
1da177e4 LT |
4812 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
4813 | ||
4814 | /* Find listening sockets and check their link_mode */ | |
23691d75 GP |
4815 | read_lock(&chan_list_lock); |
4816 | list_for_each_entry(c, &chan_list, global_l) { | |
4817 | struct sock *sk = c->sk; | |
4343478f | 4818 | |
89bc500e | 4819 | if (c->state != BT_LISTEN) |
1da177e4 LT |
4820 | continue; |
4821 | ||
4822 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 4823 | lm1 |= HCI_LM_ACCEPT; |
43bd0f32 | 4824 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 | 4825 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 4826 | exact++; |
2af6b9d5 MH |
4827 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4828 | lm2 |= HCI_LM_ACCEPT; | |
43bd0f32 | 4829 | if (test_bit(FLAG_ROLE_SWITCH, &c->flags)) |
2af6b9d5 MH |
4830 | lm2 |= HCI_LM_MASTER; |
4831 | } | |
1da177e4 | 4832 | } |
23691d75 | 4833 | read_unlock(&chan_list_lock); |
1da177e4 LT |
4834 | |
4835 | return exact ? lm1 : lm2; | |
4836 | } | |
4837 | ||
686ebf28 | 4838 | int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
1da177e4 | 4839 | { |
0139418c MH |
4840 | struct l2cap_conn *conn; |
4841 | ||
1da177e4 LT |
4842 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4843 | ||
1da177e4 | 4844 | if (!status) { |
1da177e4 LT |
4845 | conn = l2cap_conn_add(hcon, status); |
4846 | if (conn) | |
4847 | l2cap_conn_ready(conn); | |
0139418c | 4848 | } else |
e175072f | 4849 | l2cap_conn_del(hcon, bt_to_errno(status)); |
1da177e4 LT |
4850 | |
4851 | return 0; | |
4852 | } | |
4853 | ||
686ebf28 | 4854 | int l2cap_disconn_ind(struct hci_conn *hcon) |
2950f21a MH |
4855 | { |
4856 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4857 | ||
4858 | BT_DBG("hcon %p", hcon); | |
4859 | ||
686ebf28 | 4860 | if (!conn) |
9f5a0d7b | 4861 | return HCI_ERROR_REMOTE_USER_TERM; |
2950f21a MH |
4862 | return conn->disc_reason; |
4863 | } | |
4864 | ||
686ebf28 | 4865 | int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
1da177e4 LT |
4866 | { |
4867 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4868 | ||
e175072f | 4869 | l2cap_conn_del(hcon, bt_to_errno(reason)); |
1da177e4 LT |
4870 | return 0; |
4871 | } | |
4872 | ||
4343478f | 4873 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 4874 | { |
715ec005 | 4875 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) |
255c7601 MH |
4876 | return; |
4877 | ||
f62e4323 | 4878 | if (encrypt == 0x00) { |
4343478f | 4879 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
ba13ccd9 | 4880 | __set_chan_timer(chan, L2CAP_ENC_TIMEOUT); |
4343478f | 4881 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
0f852724 | 4882 | l2cap_chan_close(chan, ECONNREFUSED); |
f62e4323 | 4883 | } else { |
4343478f | 4884 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
c9b66675 | 4885 | __clear_chan_timer(chan); |
f62e4323 MH |
4886 | } |
4887 | } | |
4888 | ||
686ebf28 | 4889 | int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 4890 | { |
0139418c | 4891 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 4892 | struct l2cap_chan *chan; |
1da177e4 | 4893 | |
0139418c | 4894 | if (!conn) |
1da177e4 | 4895 | return 0; |
0139418c | 4896 | |
1da177e4 LT |
4897 | BT_DBG("conn %p", conn); |
4898 | ||
160dc6ac | 4899 | if (hcon->type == LE_LINK) { |
35d4adcc HG |
4900 | if (!status && encrypt) |
4901 | smp_distribute_keys(conn, 0); | |
17cd3f37 | 4902 | cancel_delayed_work(&conn->security_timer); |
160dc6ac VCG |
4903 | } |
4904 | ||
3df91ea2 | 4905 | mutex_lock(&conn->chan_lock); |
1da177e4 | 4906 | |
3df91ea2 | 4907 | list_for_each_entry(chan, &conn->chan_l, list) { |
6be36555 | 4908 | l2cap_chan_lock(chan); |
1da177e4 | 4909 | |
f1cb9af5 VCG |
4910 | BT_DBG("chan->scid %d", chan->scid); |
4911 | ||
4912 | if (chan->scid == L2CAP_CID_LE_DATA) { | |
4913 | if (!status && encrypt) { | |
4914 | chan->sec_level = hcon->sec_level; | |
cf4cd009 | 4915 | l2cap_chan_ready(chan); |
f1cb9af5 VCG |
4916 | } |
4917 | ||
6be36555 | 4918 | l2cap_chan_unlock(chan); |
f1cb9af5 VCG |
4919 | continue; |
4920 | } | |
4921 | ||
c1360a1c | 4922 | if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) { |
6be36555 | 4923 | l2cap_chan_unlock(chan); |
6a8d3010 MH |
4924 | continue; |
4925 | } | |
4926 | ||
89bc500e GP |
4927 | if (!status && (chan->state == BT_CONNECTED || |
4928 | chan->state == BT_CONFIG)) { | |
a7d7723a GP |
4929 | struct sock *sk = chan->sk; |
4930 | ||
4931 | bt_sk(sk)->suspended = false; | |
4932 | sk->sk_state_change(sk); | |
4933 | ||
4343478f | 4934 | l2cap_check_encryption(chan, encrypt); |
6be36555 | 4935 | l2cap_chan_unlock(chan); |
9719f8af MH |
4936 | continue; |
4937 | } | |
4938 | ||
89bc500e | 4939 | if (chan->state == BT_CONNECT) { |
b1235d79 | 4940 | if (!status) { |
9b27f350 | 4941 | l2cap_send_conn_req(chan); |
b1235d79 | 4942 | } else { |
ba13ccd9 | 4943 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
b1235d79 | 4944 | } |
89bc500e | 4945 | } else if (chan->state == BT_CONNECT2) { |
6be36555 | 4946 | struct sock *sk = chan->sk; |
b1235d79 | 4947 | struct l2cap_conn_rsp rsp; |
df3c3931 | 4948 | __u16 res, stat; |
1da177e4 | 4949 | |
6be36555 AE |
4950 | lock_sock(sk); |
4951 | ||
b1235d79 | 4952 | if (!status) { |
df3c3931 JH |
4953 | if (bt_sk(sk)->defer_setup) { |
4954 | struct sock *parent = bt_sk(sk)->parent; | |
4955 | res = L2CAP_CR_PEND; | |
4956 | stat = L2CAP_CS_AUTHOR_PEND; | |
05e9a2f6 IK |
4957 | if (parent) |
4958 | parent->sk_data_ready(parent, 0); | |
df3c3931 | 4959 | } else { |
0e587be7 | 4960 | __l2cap_state_change(chan, BT_CONFIG); |
df3c3931 JH |
4961 | res = L2CAP_CR_SUCCESS; |
4962 | stat = L2CAP_CS_NO_INFO; | |
4963 | } | |
b1235d79 | 4964 | } else { |
0e587be7 | 4965 | __l2cap_state_change(chan, BT_DISCONN); |
ba13ccd9 | 4966 | __set_chan_timer(chan, L2CAP_DISC_TIMEOUT); |
df3c3931 JH |
4967 | res = L2CAP_CR_SEC_BLOCK; |
4968 | stat = L2CAP_CS_NO_INFO; | |
b1235d79 MH |
4969 | } |
4970 | ||
6be36555 AE |
4971 | release_sock(sk); |
4972 | ||
fe4128e0 GP |
4973 | rsp.scid = cpu_to_le16(chan->dcid); |
4974 | rsp.dcid = cpu_to_le16(chan->scid); | |
df3c3931 JH |
4975 | rsp.result = cpu_to_le16(res); |
4976 | rsp.status = cpu_to_le16(stat); | |
fc7f8a7e GP |
4977 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
4978 | sizeof(rsp), &rsp); | |
b1235d79 | 4979 | } |
1da177e4 | 4980 | |
6be36555 | 4981 | l2cap_chan_unlock(chan); |
1da177e4 LT |
4982 | } |
4983 | ||
3df91ea2 | 4984 | mutex_unlock(&conn->chan_lock); |
b1235d79 | 4985 | |
1da177e4 LT |
4986 | return 0; |
4987 | } | |
4988 | ||
686ebf28 | 4989 | int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
1da177e4 LT |
4990 | { |
4991 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4992 | ||
5a08ecce AE |
4993 | if (!conn) |
4994 | conn = l2cap_conn_add(hcon, 0); | |
4995 | ||
4996 | if (!conn) | |
1da177e4 LT |
4997 | goto drop; |
4998 | ||
4999 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
5000 | ||
e702112f | 5001 | if (!(flags & ACL_CONT)) { |
1da177e4 LT |
5002 | struct l2cap_hdr *hdr; |
5003 | int len; | |
5004 | ||
5005 | if (conn->rx_len) { | |
5006 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
5007 | kfree_skb(conn->rx_skb); | |
5008 | conn->rx_skb = NULL; | |
5009 | conn->rx_len = 0; | |
5010 | l2cap_conn_unreliable(conn, ECOMM); | |
5011 | } | |
5012 | ||
aae7fe22 AE |
5013 | /* Start fragment always begin with Basic L2CAP header */ |
5014 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
5015 | BT_ERR("Frame is too short (len %d)", skb->len); |
5016 | l2cap_conn_unreliable(conn, ECOMM); | |
5017 | goto drop; | |
5018 | } | |
5019 | ||
5020 | hdr = (struct l2cap_hdr *) skb->data; | |
5021 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
5022 | ||
5023 | if (len == skb->len) { | |
5024 | /* Complete frame received */ | |
5025 | l2cap_recv_frame(conn, skb); | |
5026 | return 0; | |
5027 | } | |
5028 | ||
5029 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
5030 | ||
5031 | if (skb->len > len) { | |
5032 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
5033 | skb->len, len); | |
5034 | l2cap_conn_unreliable(conn, ECOMM); | |
5035 | goto drop; | |
5036 | } | |
5037 | ||
5038 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
5039 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
5040 | if (!conn->rx_skb) | |
1da177e4 LT |
5041 | goto drop; |
5042 | ||
d626f62b | 5043 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5044 | skb->len); |
1da177e4 LT |
5045 | conn->rx_len = len - skb->len; |
5046 | } else { | |
5047 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
5048 | ||
5049 | if (!conn->rx_len) { | |
5050 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
5051 | l2cap_conn_unreliable(conn, ECOMM); | |
5052 | goto drop; | |
5053 | } | |
5054 | ||
5055 | if (skb->len > conn->rx_len) { | |
5056 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
5057 | skb->len, conn->rx_len); | |
5058 | kfree_skb(conn->rx_skb); | |
5059 | conn->rx_skb = NULL; | |
5060 | conn->rx_len = 0; | |
5061 | l2cap_conn_unreliable(conn, ECOMM); | |
5062 | goto drop; | |
5063 | } | |
5064 | ||
d626f62b | 5065 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 5066 | skb->len); |
1da177e4 LT |
5067 | conn->rx_len -= skb->len; |
5068 | ||
5069 | if (!conn->rx_len) { | |
5070 | /* Complete frame received */ | |
5071 | l2cap_recv_frame(conn, conn->rx_skb); | |
5072 | conn->rx_skb = NULL; | |
5073 | } | |
5074 | } | |
5075 | ||
5076 | drop: | |
5077 | kfree_skb(skb); | |
5078 | return 0; | |
5079 | } | |
5080 | ||
aef7d97c | 5081 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 | 5082 | { |
23691d75 | 5083 | struct l2cap_chan *c; |
1da177e4 | 5084 | |
333055f2 | 5085 | read_lock(&chan_list_lock); |
1da177e4 | 5086 | |
23691d75 GP |
5087 | list_for_each_entry(c, &chan_list, global_l) { |
5088 | struct sock *sk = c->sk; | |
101545f6 | 5089 | |
903d343e | 5090 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
5091 | batostr(&bt_sk(sk)->src), |
5092 | batostr(&bt_sk(sk)->dst), | |
89bc500e | 5093 | c->state, __le16_to_cpu(c->psm), |
23691d75 GP |
5094 | c->scid, c->dcid, c->imtu, c->omtu, |
5095 | c->sec_level, c->mode); | |
61e1b4b7 | 5096 | } |
1da177e4 | 5097 | |
333055f2 | 5098 | read_unlock(&chan_list_lock); |
1da177e4 | 5099 | |
aef7d97c | 5100 | return 0; |
1da177e4 LT |
5101 | } |
5102 | ||
aef7d97c MH |
5103 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
5104 | { | |
5105 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
5106 | } | |
5107 | ||
5108 | static const struct file_operations l2cap_debugfs_fops = { | |
5109 | .open = l2cap_debugfs_open, | |
5110 | .read = seq_read, | |
5111 | .llseek = seq_lseek, | |
5112 | .release = single_release, | |
5113 | }; | |
5114 | ||
5115 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 5116 | |
64274518 | 5117 | int __init l2cap_init(void) |
1da177e4 LT |
5118 | { |
5119 | int err; | |
be9d1227 | 5120 | |
bb58f747 | 5121 | err = l2cap_init_sockets(); |
1da177e4 LT |
5122 | if (err < 0) |
5123 | return err; | |
5124 | ||
aef7d97c MH |
5125 | if (bt_debugfs) { |
5126 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
5127 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
5128 | if (!l2cap_debugfs) | |
5129 | BT_ERR("Failed to create L2CAP debug file"); | |
5130 | } | |
1da177e4 | 5131 | |
1da177e4 | 5132 | return 0; |
1da177e4 LT |
5133 | } |
5134 | ||
64274518 | 5135 | void l2cap_exit(void) |
1da177e4 | 5136 | { |
aef7d97c | 5137 | debugfs_remove(l2cap_debugfs); |
bb58f747 | 5138 | l2cap_cleanup_sockets(); |
1da177e4 LT |
5139 | } |
5140 | ||
d1c4a17d GP |
5141 | module_param(disable_ertm, bool, 0644); |
5142 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |