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1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated |
4 | |
5 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> |
6 | |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License version 2 as |
9 | published by the Free Software Foundation; |
10 | |
11 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
12 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
13 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. |
14 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY |
15 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
16 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
17 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
18 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
19 | |
20 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
21 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
22 | SOFTWARE IS DISCLAIMED. |
23 | */ |
24 | |
25 | /* Bluetooth L2CAP core and sockets. */ |
26 | |
27 | #include <linux/module.h> |
28 | |
29 | #include <linux/types.h> |
30 | #include <linux/capability.h> |
31 | #include <linux/errno.h> |
32 | #include <linux/kernel.h> |
33 | #include <linux/sched.h> |
34 | #include <linux/slab.h> |
35 | #include <linux/poll.h> |
36 | #include <linux/fcntl.h> |
37 | #include <linux/init.h> |
38 | #include <linux/interrupt.h> |
39 | #include <linux/socket.h> |
40 | #include <linux/skbuff.h> |
41 | #include <linux/list.h> |
42 | #include <linux/device.h> |
43 | #include <linux/debugfs.h> |
44 | #include <linux/seq_file.h> |
45 | #include <linux/uaccess.h> |
46 | #include <linux/crc16.h> |
47 | #include <net/sock.h> |
48 | |
49 | #include <asm/system.h> |
50 | #include <asm/unaligned.h> |
51 | |
52 | #include <net/bluetooth/bluetooth.h> |
53 | #include <net/bluetooth/hci_core.h> |
54 | #include <net/bluetooth/l2cap.h> |
55 | |
56 | #define VERSION "2.14" |
57 | |
58 | static int enable_ertm = 0; |
59 | static int max_transmit = L2CAP_DEFAULT_MAX_TX; |
60 | |
61 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
62 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
63 | |
64 | static const struct proto_ops l2cap_sock_ops; |
65 | |
66 | static struct bt_sock_list l2cap_sk_list = { |
67 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
68 | }; |
69 | |
70 | static void __l2cap_sock_close(struct sock *sk, int reason); |
71 | static void l2cap_sock_close(struct sock *sk); |
72 | static void l2cap_sock_kill(struct sock *sk); |
73 | |
74 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
75 | u8 code, u8 ident, u16 dlen, void *data); |
76 | |
77 | /* ---- L2CAP timers ---- */ |
78 | static void l2cap_sock_timeout(unsigned long arg) |
79 | { |
80 | struct sock *sk = (struct sock *) arg; |
81 | int reason; |
82 | |
83 | BT_DBG("sock %p state %d", sk, sk->sk_state); |
84 | |
85 | bh_lock_sock(sk); |
86 | |
87 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) |
88 | reason = ECONNREFUSED; |
89 | else if (sk->sk_state == BT_CONNECT && |
90 | l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) |
91 | reason = ECONNREFUSED; |
92 | else |
93 | reason = ETIMEDOUT; |
94 | |
95 | __l2cap_sock_close(sk, reason); |
96 | |
97 | bh_unlock_sock(sk); |
98 | |
99 | l2cap_sock_kill(sk); |
100 | sock_put(sk); |
101 | } |
102 | |
103 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) |
104 | { |
105 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); |
106 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); |
107 | } |
108 | |
109 | static void l2cap_sock_clear_timer(struct sock *sk) |
110 | { |
111 | BT_DBG("sock %p state %d", sk, sk->sk_state); |
112 | sk_stop_timer(sk, &sk->sk_timer); |
113 | } |
114 | |
115 | /* ---- L2CAP channels ---- */ |
116 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) |
117 | { |
118 | struct sock *s; |
119 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { |
120 | if (l2cap_pi(s)->dcid == cid) |
121 | break; |
122 | } |
123 | return s; |
124 | } |
125 | |
126 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) |
127 | { |
128 | struct sock *s; |
129 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { |
130 | if (l2cap_pi(s)->scid == cid) |
131 | break; |
132 | } |
133 | return s; |
134 | } |
135 | |
136 | /* Find channel with given SCID. |
137 | * Returns locked socket */ |
138 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) |
139 | { |
140 | struct sock *s; |
141 | read_lock(&l->lock); |
142 | s = __l2cap_get_chan_by_scid(l, cid); |
143 | if (s) |
144 | bh_lock_sock(s); |
145 | read_unlock(&l->lock); |
146 | return s; |
147 | } |
148 | |
149 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) |
150 | { |
151 | struct sock *s; |
152 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { |
153 | if (l2cap_pi(s)->ident == ident) |
154 | break; |
155 | } |
156 | return s; |
157 | } |
158 | |
159 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) |
160 | { |
161 | struct sock *s; |
162 | read_lock(&l->lock); |
163 | s = __l2cap_get_chan_by_ident(l, ident); |
164 | if (s) |
165 | bh_lock_sock(s); |
166 | read_unlock(&l->lock); |
167 | return s; |
168 | } |
169 | |
170 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) |
171 | { |
172 | u16 cid = L2CAP_CID_DYN_START; |
173 | |
174 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
175 | if (!__l2cap_get_chan_by_scid(l, cid)) |
176 | return cid; |
177 | } |
178 | |
179 | return 0; |
180 | } |
181 | |
182 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) |
183 | { |
184 | sock_hold(sk); |
185 | |
186 | if (l->head) |
187 | l2cap_pi(l->head)->prev_c = sk; |
188 | |
189 | l2cap_pi(sk)->next_c = l->head; |
190 | l2cap_pi(sk)->prev_c = NULL; |
191 | l->head = sk; |
192 | } |
193 | |
194 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) |
195 | { |
196 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; |
197 | |
198 | write_lock_bh(&l->lock); |
199 | if (sk == l->head) |
200 | l->head = next; |
201 | |
202 | if (next) |
203 | l2cap_pi(next)->prev_c = prev; |
204 | if (prev) |
205 | l2cap_pi(prev)->next_c = next; |
206 | write_unlock_bh(&l->lock); |
207 | |
208 | __sock_put(sk); |
209 | } |
210 | |
211 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) |
212 | { |
213 | struct l2cap_chan_list *l = &conn->chan_list; |
214 | |
215 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
216 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); |
217 | |
218 | conn->disc_reason = 0x13; |
219 | |
220 | l2cap_pi(sk)->conn = conn; |
221 | |
222 | if (sk->sk_type == SOCK_SEQPACKET) { |
223 | /* Alloc CID for connection-oriented socket */ |
224 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); |
225 | } else if (sk->sk_type == SOCK_DGRAM) { |
226 | /* Connectionless socket */ |
227 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
228 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; |
229 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
230 | } else { |
231 | /* Raw socket can send/recv signalling messages only */ |
232 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
233 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; |
234 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
235 | } |
236 | |
237 | __l2cap_chan_link(l, sk); |
238 | |
239 | if (parent) |
240 | bt_accept_enqueue(parent, sk); |
241 | } |
242 | |
243 | /* Delete channel. |
244 | * Must be called on the locked socket. */ |
245 | static void l2cap_chan_del(struct sock *sk, int err) |
246 | { |
247 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
248 | struct sock *parent = bt_sk(sk)->parent; |
249 | |
250 | l2cap_sock_clear_timer(sk); |
251 | |
252 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); |
253 | |
254 | if (conn) { |
255 | /* Unlink from channel list */ |
256 | l2cap_chan_unlink(&conn->chan_list, sk); |
257 | l2cap_pi(sk)->conn = NULL; |
258 | hci_conn_put(conn->hcon); |
259 | } |
260 | |
261 | sk->sk_state = BT_CLOSED; |
262 | sock_set_flag(sk, SOCK_ZAPPED); |
263 | |
264 | if (err) |
265 | sk->sk_err = err; |
266 | |
267 | if (parent) { |
268 | bt_accept_unlink(sk); |
269 | parent->sk_data_ready(parent, 0); |
270 | } else |
271 | sk->sk_state_change(sk); |
272 | } |
273 | |
274 | /* Service level security */ |
275 | static inline int l2cap_check_security(struct sock *sk) |
276 | { |
277 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
278 | __u8 auth_type; |
279 | |
280 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
281 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
282 | auth_type = HCI_AT_NO_BONDING_MITM; |
283 | else |
284 | auth_type = HCI_AT_NO_BONDING; |
285 | |
286 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) |
287 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
288 | } else { |
289 | switch (l2cap_pi(sk)->sec_level) { |
290 | case BT_SECURITY_HIGH: |
291 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
292 | break; |
293 | case BT_SECURITY_MEDIUM: |
294 | auth_type = HCI_AT_GENERAL_BONDING; |
295 | break; |
296 | default: |
297 | auth_type = HCI_AT_NO_BONDING; |
298 | break; |
299 | } |
300 | } |
301 | |
302 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
303 | auth_type); |
304 | } |
305 | |
306 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
307 | { |
308 | u8 id; |
309 | |
310 | /* Get next available identificator. |
311 | * 1 - 128 are used by kernel. |
312 | * 129 - 199 are reserved. |
313 | * 200 - 254 are used by utilities like l2ping, etc. |
314 | */ |
315 | |
316 | spin_lock_bh(&conn->lock); |
317 | |
318 | if (++conn->tx_ident > 128) |
319 | conn->tx_ident = 1; |
320 | |
321 | id = conn->tx_ident; |
322 | |
323 | spin_unlock_bh(&conn->lock); |
324 | |
325 | return id; |
326 | } |
327 | |
328 | static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
329 | { |
330 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); |
331 | |
332 | BT_DBG("code 0x%2.2x", code); |
333 | |
334 | if (!skb) |
335 | return -ENOMEM; |
336 | |
337 | return hci_send_acl(conn->hcon, skb, 0); |
338 | } |
339 | |
340 | static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
341 | { |
342 | struct sk_buff *skb; |
343 | struct l2cap_hdr *lh; |
344 | struct l2cap_conn *conn = pi->conn; |
345 | int count, hlen = L2CAP_HDR_SIZE + 2; |
346 | |
347 | if (pi->fcs == L2CAP_FCS_CRC16) |
348 | hlen += 2; |
349 | |
350 | BT_DBG("pi %p, control 0x%2.2x", pi, control); |
351 | |
352 | count = min_t(unsigned int, conn->mtu, hlen); |
353 | control |= L2CAP_CTRL_FRAME_TYPE; |
354 | |
355 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
356 | if (!skb) |
357 | return -ENOMEM; |
358 | |
359 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
360 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
361 | lh->cid = cpu_to_le16(pi->dcid); |
362 | put_unaligned_le16(control, skb_put(skb, 2)); |
363 | |
364 | if (pi->fcs == L2CAP_FCS_CRC16) { |
365 | u16 fcs = crc16(0, (u8 *)lh, count - 2); |
366 | put_unaligned_le16(fcs, skb_put(skb, 2)); |
367 | } |
368 | |
369 | return hci_send_acl(pi->conn->hcon, skb, 0); |
370 | } |
371 | |
372 | static inline int l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
373 | { |
374 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) |
375 | control |= L2CAP_SUPER_RCV_NOT_READY; |
376 | else |
377 | control |= L2CAP_SUPER_RCV_READY; |
378 | |
379 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
380 | |
381 | return l2cap_send_sframe(pi, control); |
382 | } |
383 | |
384 | static void l2cap_do_start(struct sock *sk) |
385 | { |
386 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
387 | |
388 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
389 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
390 | return; |
391 | |
392 | if (l2cap_check_security(sk)) { |
393 | struct l2cap_conn_req req; |
394 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); |
395 | req.psm = l2cap_pi(sk)->psm; |
396 | |
397 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
398 | |
399 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
400 | L2CAP_CONN_REQ, sizeof(req), &req); |
401 | } |
402 | } else { |
403 | struct l2cap_info_req req; |
404 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
405 | |
406 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; |
407 | conn->info_ident = l2cap_get_ident(conn); |
408 | |
409 | mod_timer(&conn->info_timer, jiffies + |
410 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); |
411 | |
412 | l2cap_send_cmd(conn, conn->info_ident, |
413 | L2CAP_INFO_REQ, sizeof(req), &req); |
414 | } |
415 | } |
416 | |
417 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk) |
418 | { |
419 | struct l2cap_disconn_req req; |
420 | |
421 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
422 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); |
423 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
424 | L2CAP_DISCONN_REQ, sizeof(req), &req); |
425 | } |
426 | |
427 | /* ---- L2CAP connections ---- */ |
428 | static void l2cap_conn_start(struct l2cap_conn *conn) |
429 | { |
430 | struct l2cap_chan_list *l = &conn->chan_list; |
431 | struct sock *sk; |
432 | |
433 | BT_DBG("conn %p", conn); |
434 | |
435 | read_lock(&l->lock); |
436 | |
437 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
438 | bh_lock_sock(sk); |
439 | |
440 | if (sk->sk_type != SOCK_SEQPACKET) { |
441 | bh_unlock_sock(sk); |
442 | continue; |
443 | } |
444 | |
445 | if (sk->sk_state == BT_CONNECT) { |
446 | if (l2cap_check_security(sk)) { |
447 | struct l2cap_conn_req req; |
448 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); |
449 | req.psm = l2cap_pi(sk)->psm; |
450 | |
451 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
452 | |
453 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
454 | L2CAP_CONN_REQ, sizeof(req), &req); |
455 | } |
456 | } else if (sk->sk_state == BT_CONNECT2) { |
457 | struct l2cap_conn_rsp rsp; |
458 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
459 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
460 | |
461 | if (l2cap_check_security(sk)) { |
462 | if (bt_sk(sk)->defer_setup) { |
463 | struct sock *parent = bt_sk(sk)->parent; |
464 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
465 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); |
466 | parent->sk_data_ready(parent, 0); |
467 | |
468 | } else { |
469 | sk->sk_state = BT_CONFIG; |
470 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
471 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
472 | } |
473 | } else { |
474 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); |
475 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); |
476 | } |
477 | |
478 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
479 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
480 | } |
481 | |
482 | bh_unlock_sock(sk); |
483 | } |
484 | |
485 | read_unlock(&l->lock); |
486 | } |
487 | |
488 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
489 | { |
490 | struct l2cap_chan_list *l = &conn->chan_list; |
491 | struct sock *sk; |
492 | |
493 | BT_DBG("conn %p", conn); |
494 | |
495 | read_lock(&l->lock); |
496 | |
497 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
498 | bh_lock_sock(sk); |
499 | |
500 | if (sk->sk_type != SOCK_SEQPACKET) { |
501 | l2cap_sock_clear_timer(sk); |
502 | sk->sk_state = BT_CONNECTED; |
503 | sk->sk_state_change(sk); |
504 | } else if (sk->sk_state == BT_CONNECT) |
505 | l2cap_do_start(sk); |
506 | |
507 | bh_unlock_sock(sk); |
508 | } |
509 | |
510 | read_unlock(&l->lock); |
511 | } |
512 | |
513 | /* Notify sockets that we cannot guaranty reliability anymore */ |
514 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) |
515 | { |
516 | struct l2cap_chan_list *l = &conn->chan_list; |
517 | struct sock *sk; |
518 | |
519 | BT_DBG("conn %p", conn); |
520 | |
521 | read_lock(&l->lock); |
522 | |
523 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
524 | if (l2cap_pi(sk)->force_reliable) |
525 | sk->sk_err = err; |
526 | } |
527 | |
528 | read_unlock(&l->lock); |
529 | } |
530 | |
531 | static void l2cap_info_timeout(unsigned long arg) |
532 | { |
533 | struct l2cap_conn *conn = (void *) arg; |
534 | |
535 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
536 | conn->info_ident = 0; |
537 | |
538 | l2cap_conn_start(conn); |
539 | } |
540 | |
541 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
542 | { |
543 | struct l2cap_conn *conn = hcon->l2cap_data; |
544 | |
545 | if (conn || status) |
546 | return conn; |
547 | |
548 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
549 | if (!conn) |
550 | return NULL; |
551 | |
552 | hcon->l2cap_data = conn; |
553 | conn->hcon = hcon; |
554 | |
555 | BT_DBG("hcon %p conn %p", hcon, conn); |
556 | |
557 | conn->mtu = hcon->hdev->acl_mtu; |
558 | conn->src = &hcon->hdev->bdaddr; |
559 | conn->dst = &hcon->dst; |
560 | |
561 | conn->feat_mask = 0; |
562 | |
563 | spin_lock_init(&conn->lock); |
564 | rwlock_init(&conn->chan_list.lock); |
565 | |
566 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
567 | (unsigned long) conn); |
568 | |
569 | conn->disc_reason = 0x13; |
570 | |
571 | return conn; |
572 | } |
573 | |
574 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
575 | { |
576 | struct l2cap_conn *conn = hcon->l2cap_data; |
577 | struct sock *sk; |
578 | |
579 | if (!conn) |
580 | return; |
581 | |
582 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); |
583 | |
584 | kfree_skb(conn->rx_skb); |
585 | |
586 | /* Kill channels */ |
587 | while ((sk = conn->chan_list.head)) { |
588 | bh_lock_sock(sk); |
589 | l2cap_chan_del(sk, err); |
590 | bh_unlock_sock(sk); |
591 | l2cap_sock_kill(sk); |
592 | } |
593 | |
594 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
595 | del_timer_sync(&conn->info_timer); |
596 | |
597 | hcon->l2cap_data = NULL; |
598 | kfree(conn); |
599 | } |
600 | |
601 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) |
602 | { |
603 | struct l2cap_chan_list *l = &conn->chan_list; |
604 | write_lock_bh(&l->lock); |
605 | __l2cap_chan_add(conn, sk, parent); |
606 | write_unlock_bh(&l->lock); |
607 | } |
608 | |
609 | /* ---- Socket interface ---- */ |
610 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
611 | { |
612 | struct sock *sk; |
613 | struct hlist_node *node; |
614 | sk_for_each(sk, node, &l2cap_sk_list.head) |
615 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) |
616 | goto found; |
617 | sk = NULL; |
618 | found: |
619 | return sk; |
620 | } |
621 | |
622 | /* Find socket with psm and source bdaddr. |
623 | * Returns closest match. |
624 | */ |
625 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
626 | { |
627 | struct sock *sk = NULL, *sk1 = NULL; |
628 | struct hlist_node *node; |
629 | |
630 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
631 | if (state && sk->sk_state != state) |
632 | continue; |
633 | |
634 | if (l2cap_pi(sk)->psm == psm) { |
635 | /* Exact match. */ |
636 | if (!bacmp(&bt_sk(sk)->src, src)) |
637 | break; |
638 | |
639 | /* Closest match */ |
640 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) |
641 | sk1 = sk; |
642 | } |
643 | } |
644 | return node ? sk : sk1; |
645 | } |
646 | |
647 | /* Find socket with given address (psm, src). |
648 | * Returns locked socket */ |
649 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
650 | { |
651 | struct sock *s; |
652 | read_lock(&l2cap_sk_list.lock); |
653 | s = __l2cap_get_sock_by_psm(state, psm, src); |
654 | if (s) |
655 | bh_lock_sock(s); |
656 | read_unlock(&l2cap_sk_list.lock); |
657 | return s; |
658 | } |
659 | |
660 | static void l2cap_sock_destruct(struct sock *sk) |
661 | { |
662 | BT_DBG("sk %p", sk); |
663 | |
664 | skb_queue_purge(&sk->sk_receive_queue); |
665 | skb_queue_purge(&sk->sk_write_queue); |
666 | } |
667 | |
668 | static void l2cap_sock_cleanup_listen(struct sock *parent) |
669 | { |
670 | struct sock *sk; |
671 | |
672 | BT_DBG("parent %p", parent); |
673 | |
674 | /* Close not yet accepted channels */ |
675 | while ((sk = bt_accept_dequeue(parent, NULL))) |
676 | l2cap_sock_close(sk); |
677 | |
678 | parent->sk_state = BT_CLOSED; |
679 | sock_set_flag(parent, SOCK_ZAPPED); |
680 | } |
681 | |
682 | /* Kill socket (only if zapped and orphan) |
683 | * Must be called on unlocked socket. |
684 | */ |
685 | static void l2cap_sock_kill(struct sock *sk) |
686 | { |
687 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) |
688 | return; |
689 | |
690 | BT_DBG("sk %p state %d", sk, sk->sk_state); |
691 | |
692 | /* Kill poor orphan */ |
693 | bt_sock_unlink(&l2cap_sk_list, sk); |
694 | sock_set_flag(sk, SOCK_DEAD); |
695 | sock_put(sk); |
696 | } |
697 | |
698 | static void __l2cap_sock_close(struct sock *sk, int reason) |
699 | { |
700 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); |
701 | |
702 | switch (sk->sk_state) { |
703 | case BT_LISTEN: |
704 | l2cap_sock_cleanup_listen(sk); |
705 | break; |
706 | |
707 | case BT_CONNECTED: |
708 | case BT_CONFIG: |
709 | if (sk->sk_type == SOCK_SEQPACKET) { |
710 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
711 | |
712 | sk->sk_state = BT_DISCONN; |
713 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
714 | l2cap_send_disconn_req(conn, sk); |
715 | } else |
716 | l2cap_chan_del(sk, reason); |
717 | break; |
718 | |
719 | case BT_CONNECT2: |
720 | if (sk->sk_type == SOCK_SEQPACKET) { |
721 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
722 | struct l2cap_conn_rsp rsp; |
723 | __u16 result; |
724 | |
725 | if (bt_sk(sk)->defer_setup) |
726 | result = L2CAP_CR_SEC_BLOCK; |
727 | else |
728 | result = L2CAP_CR_BAD_PSM; |
729 | |
730 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
731 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
732 | rsp.result = cpu_to_le16(result); |
733 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
734 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
735 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
736 | } else |
737 | l2cap_chan_del(sk, reason); |
738 | break; |
739 | |
740 | case BT_CONNECT: |
741 | case BT_DISCONN: |
742 | l2cap_chan_del(sk, reason); |
743 | break; |
744 | |
745 | default: |
746 | sock_set_flag(sk, SOCK_ZAPPED); |
747 | break; |
748 | } |
749 | } |
750 | |
751 | /* Must be called on unlocked socket. */ |
752 | static void l2cap_sock_close(struct sock *sk) |
753 | { |
754 | l2cap_sock_clear_timer(sk); |
755 | lock_sock(sk); |
756 | __l2cap_sock_close(sk, ECONNRESET); |
757 | release_sock(sk); |
758 | l2cap_sock_kill(sk); |
759 | } |
760 | |
761 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) |
762 | { |
763 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
764 | |
765 | BT_DBG("sk %p", sk); |
766 | |
767 | if (parent) { |
768 | sk->sk_type = parent->sk_type; |
769 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
770 | |
771 | pi->imtu = l2cap_pi(parent)->imtu; |
772 | pi->omtu = l2cap_pi(parent)->omtu; |
773 | pi->mode = l2cap_pi(parent)->mode; |
774 | pi->fcs = l2cap_pi(parent)->fcs; |
775 | pi->sec_level = l2cap_pi(parent)->sec_level; |
776 | pi->role_switch = l2cap_pi(parent)->role_switch; |
777 | pi->force_reliable = l2cap_pi(parent)->force_reliable; |
778 | } else { |
779 | pi->imtu = L2CAP_DEFAULT_MTU; |
780 | pi->omtu = 0; |
781 | pi->mode = L2CAP_MODE_BASIC; |
782 | pi->fcs = L2CAP_FCS_CRC16; |
783 | pi->sec_level = BT_SECURITY_LOW; |
784 | pi->role_switch = 0; |
785 | pi->force_reliable = 0; |
786 | } |
787 | |
788 | /* Default config options */ |
789 | pi->conf_len = 0; |
790 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
791 | skb_queue_head_init(TX_QUEUE(sk)); |
792 | skb_queue_head_init(SREJ_QUEUE(sk)); |
793 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
794 | } |
795 | |
796 | static struct proto l2cap_proto = { |
797 | .name = "L2CAP", |
798 | .owner = THIS_MODULE, |
799 | .obj_size = sizeof(struct l2cap_pinfo) |
800 | }; |
801 | |
802 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
803 | { |
804 | struct sock *sk; |
805 | |
806 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
807 | if (!sk) |
808 | return NULL; |
809 | |
810 | sock_init_data(sock, sk); |
811 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); |
812 | |
813 | sk->sk_destruct = l2cap_sock_destruct; |
814 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
815 | |
816 | sock_reset_flag(sk, SOCK_ZAPPED); |
817 | |
818 | sk->sk_protocol = proto; |
819 | sk->sk_state = BT_OPEN; |
820 | |
821 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
822 | |
823 | bt_sock_link(&l2cap_sk_list, sk); |
824 | return sk; |
825 | } |
826 | |
827 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
828 | int kern) |
829 | { |
830 | struct sock *sk; |
831 | |
832 | BT_DBG("sock %p", sock); |
833 | |
834 | sock->state = SS_UNCONNECTED; |
835 | |
836 | if (sock->type != SOCK_SEQPACKET && |
837 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
838 | return -ESOCKTNOSUPPORT; |
839 | |
840 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
841 | return -EPERM; |
842 | |
843 | sock->ops = &l2cap_sock_ops; |
844 | |
845 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
846 | if (!sk) |
847 | return -ENOMEM; |
848 | |
849 | l2cap_sock_init(sk, NULL); |
850 | return 0; |
851 | } |
852 | |
853 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
854 | { |
855 | struct sock *sk = sock->sk; |
856 | struct sockaddr_l2 la; |
857 | int len, err = 0; |
858 | |
859 | BT_DBG("sk %p", sk); |
860 | |
861 | if (!addr || addr->sa_family != AF_BLUETOOTH) |
862 | return -EINVAL; |
863 | |
864 | memset(&la, 0, sizeof(la)); |
865 | len = min_t(unsigned int, sizeof(la), alen); |
866 | memcpy(&la, addr, len); |
867 | |
868 | if (la.l2_cid) |
869 | return -EINVAL; |
870 | |
871 | lock_sock(sk); |
872 | |
873 | if (sk->sk_state != BT_OPEN) { |
874 | err = -EBADFD; |
875 | goto done; |
876 | } |
877 | |
878 | if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && |
879 | !capable(CAP_NET_BIND_SERVICE)) { |
880 | err = -EACCES; |
881 | goto done; |
882 | } |
883 | |
884 | write_lock_bh(&l2cap_sk_list.lock); |
885 | |
886 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
887 | err = -EADDRINUSE; |
888 | } else { |
889 | /* Save source address */ |
890 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
891 | l2cap_pi(sk)->psm = la.l2_psm; |
892 | l2cap_pi(sk)->sport = la.l2_psm; |
893 | sk->sk_state = BT_BOUND; |
894 | |
895 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
896 | __le16_to_cpu(la.l2_psm) == 0x0003) |
897 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
898 | } |
899 | |
900 | write_unlock_bh(&l2cap_sk_list.lock); |
901 | |
902 | done: |
903 | release_sock(sk); |
904 | return err; |
905 | } |
906 | |
907 | static int l2cap_do_connect(struct sock *sk) |
908 | { |
909 | bdaddr_t *src = &bt_sk(sk)->src; |
910 | bdaddr_t *dst = &bt_sk(sk)->dst; |
911 | struct l2cap_conn *conn; |
912 | struct hci_conn *hcon; |
913 | struct hci_dev *hdev; |
914 | __u8 auth_type; |
915 | int err; |
916 | |
917 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
918 | l2cap_pi(sk)->psm); |
919 | |
920 | hdev = hci_get_route(dst, src); |
921 | if (!hdev) |
922 | return -EHOSTUNREACH; |
923 | |
924 | hci_dev_lock_bh(hdev); |
925 | |
926 | err = -ENOMEM; |
927 | |
928 | if (sk->sk_type == SOCK_RAW) { |
929 | switch (l2cap_pi(sk)->sec_level) { |
930 | case BT_SECURITY_HIGH: |
931 | auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
932 | break; |
933 | case BT_SECURITY_MEDIUM: |
934 | auth_type = HCI_AT_DEDICATED_BONDING; |
935 | break; |
936 | default: |
937 | auth_type = HCI_AT_NO_BONDING; |
938 | break; |
939 | } |
940 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
941 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
942 | auth_type = HCI_AT_NO_BONDING_MITM; |
943 | else |
944 | auth_type = HCI_AT_NO_BONDING; |
945 | |
946 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) |
947 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
948 | } else { |
949 | switch (l2cap_pi(sk)->sec_level) { |
950 | case BT_SECURITY_HIGH: |
951 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
952 | break; |
953 | case BT_SECURITY_MEDIUM: |
954 | auth_type = HCI_AT_GENERAL_BONDING; |
955 | break; |
956 | default: |
957 | auth_type = HCI_AT_NO_BONDING; |
958 | break; |
959 | } |
960 | } |
961 | |
962 | hcon = hci_connect(hdev, ACL_LINK, dst, |
963 | l2cap_pi(sk)->sec_level, auth_type); |
964 | if (!hcon) |
965 | goto done; |
966 | |
967 | conn = l2cap_conn_add(hcon, 0); |
968 | if (!conn) { |
969 | hci_conn_put(hcon); |
970 | goto done; |
971 | } |
972 | |
973 | err = 0; |
974 | |
975 | /* Update source addr of the socket */ |
976 | bacpy(src, conn->src); |
977 | |
978 | l2cap_chan_add(conn, sk, NULL); |
979 | |
980 | sk->sk_state = BT_CONNECT; |
981 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
982 | |
983 | if (hcon->state == BT_CONNECTED) { |
984 | if (sk->sk_type != SOCK_SEQPACKET) { |
985 | l2cap_sock_clear_timer(sk); |
986 | sk->sk_state = BT_CONNECTED; |
987 | } else |
988 | l2cap_do_start(sk); |
989 | } |
990 | |
991 | done: |
992 | hci_dev_unlock_bh(hdev); |
993 | hci_dev_put(hdev); |
994 | return err; |
995 | } |
996 | |
997 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) |
998 | { |
999 | struct sock *sk = sock->sk; |
1000 | struct sockaddr_l2 la; |
1001 | int len, err = 0; |
1002 | |
1003 | BT_DBG("sk %p", sk); |
1004 | |
1005 | if (!addr || alen < sizeof(addr->sa_family) || |
1006 | addr->sa_family != AF_BLUETOOTH) |
1007 | return -EINVAL; |
1008 | |
1009 | memset(&la, 0, sizeof(la)); |
1010 | len = min_t(unsigned int, sizeof(la), alen); |
1011 | memcpy(&la, addr, len); |
1012 | |
1013 | if (la.l2_cid) |
1014 | return -EINVAL; |
1015 | |
1016 | lock_sock(sk); |
1017 | |
1018 | if (sk->sk_type == SOCK_SEQPACKET && !la.l2_psm) { |
1019 | err = -EINVAL; |
1020 | goto done; |
1021 | } |
1022 | |
1023 | switch (l2cap_pi(sk)->mode) { |
1024 | case L2CAP_MODE_BASIC: |
1025 | break; |
1026 | case L2CAP_MODE_ERTM: |
1027 | case L2CAP_MODE_STREAMING: |
1028 | if (enable_ertm) |
1029 | break; |
1030 | /* fall through */ |
1031 | default: |
1032 | err = -ENOTSUPP; |
1033 | goto done; |
1034 | } |
1035 | |
1036 | switch (sk->sk_state) { |
1037 | case BT_CONNECT: |
1038 | case BT_CONNECT2: |
1039 | case BT_CONFIG: |
1040 | /* Already connecting */ |
1041 | goto wait; |
1042 | |
1043 | case BT_CONNECTED: |
1044 | /* Already connected */ |
1045 | goto done; |
1046 | |
1047 | case BT_OPEN: |
1048 | case BT_BOUND: |
1049 | /* Can connect */ |
1050 | break; |
1051 | |
1052 | default: |
1053 | err = -EBADFD; |
1054 | goto done; |
1055 | } |
1056 | |
1057 | /* Set destination address and psm */ |
1058 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1059 | l2cap_pi(sk)->psm = la.l2_psm; |
1060 | |
1061 | err = l2cap_do_connect(sk); |
1062 | if (err) |
1063 | goto done; |
1064 | |
1065 | wait: |
1066 | err = bt_sock_wait_state(sk, BT_CONNECTED, |
1067 | sock_sndtimeo(sk, flags & O_NONBLOCK)); |
1068 | done: |
1069 | release_sock(sk); |
1070 | return err; |
1071 | } |
1072 | |
1073 | static int l2cap_sock_listen(struct socket *sock, int backlog) |
1074 | { |
1075 | struct sock *sk = sock->sk; |
1076 | int err = 0; |
1077 | |
1078 | BT_DBG("sk %p backlog %d", sk, backlog); |
1079 | |
1080 | lock_sock(sk); |
1081 | |
1082 | if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) { |
1083 | err = -EBADFD; |
1084 | goto done; |
1085 | } |
1086 | |
1087 | switch (l2cap_pi(sk)->mode) { |
1088 | case L2CAP_MODE_BASIC: |
1089 | break; |
1090 | case L2CAP_MODE_ERTM: |
1091 | case L2CAP_MODE_STREAMING: |
1092 | if (enable_ertm) |
1093 | break; |
1094 | /* fall through */ |
1095 | default: |
1096 | err = -ENOTSUPP; |
1097 | goto done; |
1098 | } |
1099 | |
1100 | if (!l2cap_pi(sk)->psm) { |
1101 | bdaddr_t *src = &bt_sk(sk)->src; |
1102 | u16 psm; |
1103 | |
1104 | err = -EINVAL; |
1105 | |
1106 | write_lock_bh(&l2cap_sk_list.lock); |
1107 | |
1108 | for (psm = 0x1001; psm < 0x1100; psm += 2) |
1109 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1110 | l2cap_pi(sk)->psm = cpu_to_le16(psm); |
1111 | l2cap_pi(sk)->sport = cpu_to_le16(psm); |
1112 | err = 0; |
1113 | break; |
1114 | } |
1115 | |
1116 | write_unlock_bh(&l2cap_sk_list.lock); |
1117 | |
1118 | if (err < 0) |
1119 | goto done; |
1120 | } |
1121 | |
1122 | sk->sk_max_ack_backlog = backlog; |
1123 | sk->sk_ack_backlog = 0; |
1124 | sk->sk_state = BT_LISTEN; |
1125 | |
1126 | done: |
1127 | release_sock(sk); |
1128 | return err; |
1129 | } |
1130 | |
1131 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) |
1132 | { |
1133 | DECLARE_WAITQUEUE(wait, current); |
1134 | struct sock *sk = sock->sk, *nsk; |
1135 | long timeo; |
1136 | int err = 0; |
1137 | |
1138 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1139 | |
1140 | if (sk->sk_state != BT_LISTEN) { |
1141 | err = -EBADFD; |
1142 | goto done; |
1143 | } |
1144 | |
1145 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1146 | |
1147 | BT_DBG("sk %p timeo %ld", sk, timeo); |
1148 | |
1149 | /* Wait for an incoming connection. (wake-one). */ |
1150 | add_wait_queue_exclusive(sk->sk_sleep, &wait); |
1151 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1152 | set_current_state(TASK_INTERRUPTIBLE); |
1153 | if (!timeo) { |
1154 | err = -EAGAIN; |
1155 | break; |
1156 | } |
1157 | |
1158 | release_sock(sk); |
1159 | timeo = schedule_timeout(timeo); |
1160 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1161 | |
1162 | if (sk->sk_state != BT_LISTEN) { |
1163 | err = -EBADFD; |
1164 | break; |
1165 | } |
1166 | |
1167 | if (signal_pending(current)) { |
1168 | err = sock_intr_errno(timeo); |
1169 | break; |
1170 | } |
1171 | } |
1172 | set_current_state(TASK_RUNNING); |
1173 | remove_wait_queue(sk->sk_sleep, &wait); |
1174 | |
1175 | if (err) |
1176 | goto done; |
1177 | |
1178 | newsock->state = SS_CONNECTED; |
1179 | |
1180 | BT_DBG("new socket %p", nsk); |
1181 | |
1182 | done: |
1183 | release_sock(sk); |
1184 | return err; |
1185 | } |
1186 | |
1187 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) |
1188 | { |
1189 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; |
1190 | struct sock *sk = sock->sk; |
1191 | |
1192 | BT_DBG("sock %p, sk %p", sock, sk); |
1193 | |
1194 | addr->sa_family = AF_BLUETOOTH; |
1195 | *len = sizeof(struct sockaddr_l2); |
1196 | |
1197 | if (peer) { |
1198 | la->l2_psm = l2cap_pi(sk)->psm; |
1199 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
1200 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1201 | } else { |
1202 | la->l2_psm = l2cap_pi(sk)->sport; |
1203 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
1204 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
1205 | } |
1206 | |
1207 | return 0; |
1208 | } |
1209 | |
1210 | static void l2cap_monitor_timeout(unsigned long arg) |
1211 | { |
1212 | struct sock *sk = (void *) arg; |
1213 | u16 control; |
1214 | |
1215 | bh_lock_sock(sk); |
1216 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
1217 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk); |
1218 | bh_unlock_sock(sk); |
1219 | return; |
1220 | } |
1221 | |
1222 | l2cap_pi(sk)->retry_count++; |
1223 | __mod_monitor_timer(); |
1224 | |
1225 | control = L2CAP_CTRL_POLL; |
1226 | l2cap_send_rr_or_rnr(l2cap_pi(sk), control); |
1227 | bh_unlock_sock(sk); |
1228 | } |
1229 | |
1230 | static void l2cap_retrans_timeout(unsigned long arg) |
1231 | { |
1232 | struct sock *sk = (void *) arg; |
1233 | u16 control; |
1234 | |
1235 | bh_lock_sock(sk); |
1236 | l2cap_pi(sk)->retry_count = 1; |
1237 | __mod_monitor_timer(); |
1238 | |
1239 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; |
1240 | |
1241 | control = L2CAP_CTRL_POLL; |
1242 | l2cap_send_rr_or_rnr(l2cap_pi(sk), control); |
1243 | bh_unlock_sock(sk); |
1244 | } |
1245 | |
1246 | static void l2cap_drop_acked_frames(struct sock *sk) |
1247 | { |
1248 | struct sk_buff *skb; |
1249 | |
1250 | while ((skb = skb_peek(TX_QUEUE(sk)))) { |
1251 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1252 | break; |
1253 | |
1254 | skb = skb_dequeue(TX_QUEUE(sk)); |
1255 | kfree_skb(skb); |
1256 | |
1257 | l2cap_pi(sk)->unacked_frames--; |
1258 | } |
1259 | |
1260 | if (!l2cap_pi(sk)->unacked_frames) |
1261 | del_timer(&l2cap_pi(sk)->retrans_timer); |
1262 | |
1263 | return; |
1264 | } |
1265 | |
1266 | static inline int l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1267 | { |
1268 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1269 | int err; |
1270 | |
1271 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); |
1272 | |
1273 | err = hci_send_acl(pi->conn->hcon, skb, 0); |
1274 | if (err < 0) |
1275 | kfree_skb(skb); |
1276 | |
1277 | return err; |
1278 | } |
1279 | |
1280 | static int l2cap_streaming_send(struct sock *sk) |
1281 | { |
1282 | struct sk_buff *skb, *tx_skb; |
1283 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1284 | u16 control, fcs; |
1285 | int err; |
1286 | |
1287 | while ((skb = sk->sk_send_head)) { |
1288 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1289 | |
1290 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
1291 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
1292 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1293 | |
1294 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) { |
1295 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1296 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); |
1297 | } |
1298 | |
1299 | err = l2cap_do_send(sk, tx_skb); |
1300 | if (err < 0) { |
1301 | l2cap_send_disconn_req(pi->conn, sk); |
1302 | return err; |
1303 | } |
1304 | |
1305 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; |
1306 | |
1307 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1308 | sk->sk_send_head = NULL; |
1309 | else |
1310 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); |
1311 | |
1312 | skb = skb_dequeue(TX_QUEUE(sk)); |
1313 | kfree_skb(skb); |
1314 | } |
1315 | return 0; |
1316 | } |
1317 | |
1318 | static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq) |
1319 | { |
1320 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1321 | struct sk_buff *skb, *tx_skb; |
1322 | u16 control, fcs; |
1323 | int err; |
1324 | |
1325 | skb = skb_peek(TX_QUEUE(sk)); |
1326 | do { |
1327 | if (bt_cb(skb)->tx_seq != tx_seq) { |
1328 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1329 | break; |
1330 | skb = skb_queue_next(TX_QUEUE(sk), skb); |
1331 | continue; |
1332 | } |
1333 | |
1334 | if (pi->remote_max_tx && |
1335 | bt_cb(skb)->retries == pi->remote_max_tx) { |
1336 | l2cap_send_disconn_req(pi->conn, sk); |
1337 | break; |
1338 | } |
1339 | |
1340 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1341 | bt_cb(skb)->retries++; |
1342 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
1343 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1344 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1345 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1346 | |
1347 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) { |
1348 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1349 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); |
1350 | } |
1351 | |
1352 | err = l2cap_do_send(sk, tx_skb); |
1353 | if (err < 0) { |
1354 | l2cap_send_disconn_req(pi->conn, sk); |
1355 | return err; |
1356 | } |
1357 | break; |
1358 | } while(1); |
1359 | return 0; |
1360 | } |
1361 | |
1362 | static int l2cap_ertm_send(struct sock *sk) |
1363 | { |
1364 | struct sk_buff *skb, *tx_skb; |
1365 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1366 | u16 control, fcs; |
1367 | int err; |
1368 | |
1369 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
1370 | return 0; |
1371 | |
1372 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) && |
1373 | !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) { |
1374 | |
1375 | if (pi->remote_max_tx && |
1376 | bt_cb(skb)->retries == pi->remote_max_tx) { |
1377 | l2cap_send_disconn_req(pi->conn, sk); |
1378 | break; |
1379 | } |
1380 | |
1381 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1382 | |
1383 | bt_cb(skb)->retries++; |
1384 | |
1385 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
1386 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1387 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1388 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1389 | |
1390 | |
1391 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) { |
1392 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1393 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); |
1394 | } |
1395 | |
1396 | err = l2cap_do_send(sk, tx_skb); |
1397 | if (err < 0) { |
1398 | l2cap_send_disconn_req(pi->conn, sk); |
1399 | return err; |
1400 | } |
1401 | __mod_retrans_timer(); |
1402 | |
1403 | bt_cb(skb)->tx_seq = pi->next_tx_seq; |
1404 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; |
1405 | |
1406 | pi->unacked_frames++; |
1407 | |
1408 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1409 | sk->sk_send_head = NULL; |
1410 | else |
1411 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); |
1412 | } |
1413 | |
1414 | return 0; |
1415 | } |
1416 | |
1417 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1418 | { |
1419 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1420 | struct sk_buff **frag; |
1421 | int err, sent = 0; |
1422 | |
1423 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) { |
1424 | return -EFAULT; |
1425 | } |
1426 | |
1427 | sent += count; |
1428 | len -= count; |
1429 | |
1430 | /* Continuation fragments (no L2CAP header) */ |
1431 | frag = &skb_shinfo(skb)->frag_list; |
1432 | while (len) { |
1433 | count = min_t(unsigned int, conn->mtu, len); |
1434 | |
1435 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); |
1436 | if (!*frag) |
1437 | return -EFAULT; |
1438 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1439 | return -EFAULT; |
1440 | |
1441 | sent += count; |
1442 | len -= count; |
1443 | |
1444 | frag = &(*frag)->next; |
1445 | } |
1446 | |
1447 | return sent; |
1448 | } |
1449 | |
1450 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1451 | { |
1452 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1453 | struct sk_buff *skb; |
1454 | int err, count, hlen = L2CAP_HDR_SIZE + 2; |
1455 | struct l2cap_hdr *lh; |
1456 | |
1457 | BT_DBG("sk %p len %d", sk, (int)len); |
1458 | |
1459 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1460 | skb = bt_skb_send_alloc(sk, count + hlen, |
1461 | msg->msg_flags & MSG_DONTWAIT, &err); |
1462 | if (!skb) |
1463 | return ERR_PTR(-ENOMEM); |
1464 | |
1465 | /* Create L2CAP header */ |
1466 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
1467 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1468 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1469 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); |
1470 | |
1471 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); |
1472 | if (unlikely(err < 0)) { |
1473 | kfree_skb(skb); |
1474 | return ERR_PTR(err); |
1475 | } |
1476 | return skb; |
1477 | } |
1478 | |
1479 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1480 | { |
1481 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1482 | struct sk_buff *skb; |
1483 | int err, count, hlen = L2CAP_HDR_SIZE; |
1484 | struct l2cap_hdr *lh; |
1485 | |
1486 | BT_DBG("sk %p len %d", sk, (int)len); |
1487 | |
1488 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1489 | skb = bt_skb_send_alloc(sk, count + hlen, |
1490 | msg->msg_flags & MSG_DONTWAIT, &err); |
1491 | if (!skb) |
1492 | return ERR_PTR(-ENOMEM); |
1493 | |
1494 | /* Create L2CAP header */ |
1495 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
1496 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1497 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1498 | |
1499 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); |
1500 | if (unlikely(err < 0)) { |
1501 | kfree_skb(skb); |
1502 | return ERR_PTR(err); |
1503 | } |
1504 | return skb; |
1505 | } |
1506 | |
1507 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1508 | { |
1509 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1510 | struct sk_buff *skb; |
1511 | int err, count, hlen = L2CAP_HDR_SIZE + 2; |
1512 | struct l2cap_hdr *lh; |
1513 | |
1514 | BT_DBG("sk %p len %d", sk, (int)len); |
1515 | |
1516 | if (sdulen) |
1517 | hlen += 2; |
1518 | |
1519 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1520 | hlen += 2; |
1521 | |
1522 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1523 | skb = bt_skb_send_alloc(sk, count + hlen, |
1524 | msg->msg_flags & MSG_DONTWAIT, &err); |
1525 | if (!skb) |
1526 | return ERR_PTR(-ENOMEM); |
1527 | |
1528 | /* Create L2CAP header */ |
1529 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
1530 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1531 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); |
1532 | put_unaligned_le16(control, skb_put(skb, 2)); |
1533 | if (sdulen) |
1534 | put_unaligned_le16(sdulen, skb_put(skb, 2)); |
1535 | |
1536 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); |
1537 | if (unlikely(err < 0)) { |
1538 | kfree_skb(skb); |
1539 | return ERR_PTR(err); |
1540 | } |
1541 | |
1542 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1543 | put_unaligned_le16(0, skb_put(skb, 2)); |
1544 | |
1545 | bt_cb(skb)->retries = 0; |
1546 | return skb; |
1547 | } |
1548 | |
1549 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1550 | { |
1551 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1552 | struct sk_buff *skb; |
1553 | struct sk_buff_head sar_queue; |
1554 | u16 control; |
1555 | size_t size = 0; |
1556 | |
1557 | __skb_queue_head_init(&sar_queue); |
1558 | control = L2CAP_SDU_START; |
1559 | skb = l2cap_create_iframe_pdu(sk, msg, pi->max_pdu_size, control, len); |
1560 | if (IS_ERR(skb)) |
1561 | return PTR_ERR(skb); |
1562 | |
1563 | __skb_queue_tail(&sar_queue, skb); |
1564 | len -= pi->max_pdu_size; |
1565 | size +=pi->max_pdu_size; |
1566 | control = 0; |
1567 | |
1568 | while (len > 0) { |
1569 | size_t buflen; |
1570 | |
1571 | if (len > pi->max_pdu_size) { |
1572 | control |= L2CAP_SDU_CONTINUE; |
1573 | buflen = pi->max_pdu_size; |
1574 | } else { |
1575 | control |= L2CAP_SDU_END; |
1576 | buflen = len; |
1577 | } |
1578 | |
1579 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
1580 | if (IS_ERR(skb)) { |
1581 | skb_queue_purge(&sar_queue); |
1582 | return PTR_ERR(skb); |
1583 | } |
1584 | |
1585 | __skb_queue_tail(&sar_queue, skb); |
1586 | len -= buflen; |
1587 | size += buflen; |
1588 | control = 0; |
1589 | } |
1590 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); |
1591 | if (sk->sk_send_head == NULL) |
1592 | sk->sk_send_head = sar_queue.next; |
1593 | |
1594 | return size; |
1595 | } |
1596 | |
1597 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1598 | { |
1599 | struct sock *sk = sock->sk; |
1600 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1601 | struct sk_buff *skb; |
1602 | u16 control; |
1603 | int err; |
1604 | |
1605 | BT_DBG("sock %p, sk %p", sock, sk); |
1606 | |
1607 | err = sock_error(sk); |
1608 | if (err) |
1609 | return err; |
1610 | |
1611 | if (msg->msg_flags & MSG_OOB) |
1612 | return -EOPNOTSUPP; |
1613 | |
1614 | /* Check outgoing MTU */ |
1615 | if (sk->sk_type == SOCK_SEQPACKET && pi->mode == L2CAP_MODE_BASIC && |
1616 | len > pi->omtu) |
1617 | return -EINVAL; |
1618 | |
1619 | lock_sock(sk); |
1620 | |
1621 | if (sk->sk_state != BT_CONNECTED) { |
1622 | err = -ENOTCONN; |
1623 | goto done; |
1624 | } |
1625 | |
1626 | /* Connectionless channel */ |
1627 | if (sk->sk_type == SOCK_DGRAM) { |
1628 | skb = l2cap_create_connless_pdu(sk, msg, len); |
1629 | if (IS_ERR(skb)) |
1630 | err = PTR_ERR(skb); |
1631 | else |
1632 | err = l2cap_do_send(sk, skb); |
1633 | goto done; |
1634 | } |
1635 | |
1636 | switch (pi->mode) { |
1637 | case L2CAP_MODE_BASIC: |
1638 | /* Create a basic PDU */ |
1639 | skb = l2cap_create_basic_pdu(sk, msg, len); |
1640 | if (IS_ERR(skb)) { |
1641 | err = PTR_ERR(skb); |
1642 | goto done; |
1643 | } |
1644 | |
1645 | err = l2cap_do_send(sk, skb); |
1646 | if (!err) |
1647 | err = len; |
1648 | break; |
1649 | |
1650 | case L2CAP_MODE_ERTM: |
1651 | case L2CAP_MODE_STREAMING: |
1652 | /* Entire SDU fits into one PDU */ |
1653 | if (len <= pi->max_pdu_size) { |
1654 | control = L2CAP_SDU_UNSEGMENTED; |
1655 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1656 | if (IS_ERR(skb)) { |
1657 | err = PTR_ERR(skb); |
1658 | goto done; |
1659 | } |
1660 | __skb_queue_tail(TX_QUEUE(sk), skb); |
1661 | if (sk->sk_send_head == NULL) |
1662 | sk->sk_send_head = skb; |
1663 | } else { |
1664 | /* Segment SDU into multiples PDUs */ |
1665 | err = l2cap_sar_segment_sdu(sk, msg, len); |
1666 | if (err < 0) |
1667 | goto done; |
1668 | } |
1669 | |
1670 | if (pi->mode == L2CAP_MODE_STREAMING) |
1671 | err = l2cap_streaming_send(sk); |
1672 | else |
1673 | err = l2cap_ertm_send(sk); |
1674 | |
1675 | if (!err) |
1676 | err = len; |
1677 | break; |
1678 | |
1679 | default: |
1680 | BT_DBG("bad state %1.1x", pi->mode); |
1681 | err = -EINVAL; |
1682 | } |
1683 | |
1684 | done: |
1685 | release_sock(sk); |
1686 | return err; |
1687 | } |
1688 | |
1689 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1690 | { |
1691 | struct sock *sk = sock->sk; |
1692 | |
1693 | lock_sock(sk); |
1694 | |
1695 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { |
1696 | struct l2cap_conn_rsp rsp; |
1697 | |
1698 | sk->sk_state = BT_CONFIG; |
1699 | |
1700 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1701 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
1702 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); |
1703 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
1704 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, |
1705 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
1706 | |
1707 | release_sock(sk); |
1708 | return 0; |
1709 | } |
1710 | |
1711 | release_sock(sk); |
1712 | |
1713 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); |
1714 | } |
1715 | |
1716 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1717 | { |
1718 | struct sock *sk = sock->sk; |
1719 | struct l2cap_options opts; |
1720 | int len, err = 0; |
1721 | u32 opt; |
1722 | |
1723 | BT_DBG("sk %p", sk); |
1724 | |
1725 | lock_sock(sk); |
1726 | |
1727 | switch (optname) { |
1728 | case L2CAP_OPTIONS: |
1729 | opts.imtu = l2cap_pi(sk)->imtu; |
1730 | opts.omtu = l2cap_pi(sk)->omtu; |
1731 | opts.flush_to = l2cap_pi(sk)->flush_to; |
1732 | opts.mode = l2cap_pi(sk)->mode; |
1733 | opts.fcs = l2cap_pi(sk)->fcs; |
1734 | |
1735 | len = min_t(unsigned int, sizeof(opts), optlen); |
1736 | if (copy_from_user((char *) &opts, optval, len)) { |
1737 | err = -EFAULT; |
1738 | break; |
1739 | } |
1740 | |
1741 | l2cap_pi(sk)->imtu = opts.imtu; |
1742 | l2cap_pi(sk)->omtu = opts.omtu; |
1743 | l2cap_pi(sk)->mode = opts.mode; |
1744 | l2cap_pi(sk)->fcs = opts.fcs; |
1745 | break; |
1746 | |
1747 | case L2CAP_LM: |
1748 | if (get_user(opt, (u32 __user *) optval)) { |
1749 | err = -EFAULT; |
1750 | break; |
1751 | } |
1752 | |
1753 | if (opt & L2CAP_LM_AUTH) |
1754 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; |
1755 | if (opt & L2CAP_LM_ENCRYPT) |
1756 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; |
1757 | if (opt & L2CAP_LM_SECURE) |
1758 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; |
1759 | |
1760 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); |
1761 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); |
1762 | break; |
1763 | |
1764 | default: |
1765 | err = -ENOPROTOOPT; |
1766 | break; |
1767 | } |
1768 | |
1769 | release_sock(sk); |
1770 | return err; |
1771 | } |
1772 | |
1773 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
1774 | { |
1775 | struct sock *sk = sock->sk; |
1776 | struct bt_security sec; |
1777 | int len, err = 0; |
1778 | u32 opt; |
1779 | |
1780 | BT_DBG("sk %p", sk); |
1781 | |
1782 | if (level == SOL_L2CAP) |
1783 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); |
1784 | |
1785 | if (level != SOL_BLUETOOTH) |
1786 | return -ENOPROTOOPT; |
1787 | |
1788 | lock_sock(sk); |
1789 | |
1790 | switch (optname) { |
1791 | case BT_SECURITY: |
1792 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) { |
1793 | err = -EINVAL; |
1794 | break; |
1795 | } |
1796 | |
1797 | sec.level = BT_SECURITY_LOW; |
1798 | |
1799 | len = min_t(unsigned int, sizeof(sec), optlen); |
1800 | if (copy_from_user((char *) &sec, optval, len)) { |
1801 | err = -EFAULT; |
1802 | break; |
1803 | } |
1804 | |
1805 | if (sec.level < BT_SECURITY_LOW || |
1806 | sec.level > BT_SECURITY_HIGH) { |
1807 | err = -EINVAL; |
1808 | break; |
1809 | } |
1810 | |
1811 | l2cap_pi(sk)->sec_level = sec.level; |
1812 | break; |
1813 | |
1814 | case BT_DEFER_SETUP: |
1815 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { |
1816 | err = -EINVAL; |
1817 | break; |
1818 | } |
1819 | |
1820 | if (get_user(opt, (u32 __user *) optval)) { |
1821 | err = -EFAULT; |
1822 | break; |
1823 | } |
1824 | |
1825 | bt_sk(sk)->defer_setup = opt; |
1826 | break; |
1827 | |
1828 | default: |
1829 | err = -ENOPROTOOPT; |
1830 | break; |
1831 | } |
1832 | |
1833 | release_sock(sk); |
1834 | return err; |
1835 | } |
1836 | |
1837 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) |
1838 | { |
1839 | struct sock *sk = sock->sk; |
1840 | struct l2cap_options opts; |
1841 | struct l2cap_conninfo cinfo; |
1842 | int len, err = 0; |
1843 | u32 opt; |
1844 | |
1845 | BT_DBG("sk %p", sk); |
1846 | |
1847 | if (get_user(len, optlen)) |
1848 | return -EFAULT; |
1849 | |
1850 | lock_sock(sk); |
1851 | |
1852 | switch (optname) { |
1853 | case L2CAP_OPTIONS: |
1854 | opts.imtu = l2cap_pi(sk)->imtu; |
1855 | opts.omtu = l2cap_pi(sk)->omtu; |
1856 | opts.flush_to = l2cap_pi(sk)->flush_to; |
1857 | opts.mode = l2cap_pi(sk)->mode; |
1858 | opts.fcs = l2cap_pi(sk)->fcs; |
1859 | |
1860 | len = min_t(unsigned int, len, sizeof(opts)); |
1861 | if (copy_to_user(optval, (char *) &opts, len)) |
1862 | err = -EFAULT; |
1863 | |
1864 | break; |
1865 | |
1866 | case L2CAP_LM: |
1867 | switch (l2cap_pi(sk)->sec_level) { |
1868 | case BT_SECURITY_LOW: |
1869 | opt = L2CAP_LM_AUTH; |
1870 | break; |
1871 | case BT_SECURITY_MEDIUM: |
1872 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; |
1873 | break; |
1874 | case BT_SECURITY_HIGH: |
1875 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | |
1876 | L2CAP_LM_SECURE; |
1877 | break; |
1878 | default: |
1879 | opt = 0; |
1880 | break; |
1881 | } |
1882 | |
1883 | if (l2cap_pi(sk)->role_switch) |
1884 | opt |= L2CAP_LM_MASTER; |
1885 | |
1886 | if (l2cap_pi(sk)->force_reliable) |
1887 | opt |= L2CAP_LM_RELIABLE; |
1888 | |
1889 | if (put_user(opt, (u32 __user *) optval)) |
1890 | err = -EFAULT; |
1891 | break; |
1892 | |
1893 | case L2CAP_CONNINFO: |
1894 | if (sk->sk_state != BT_CONNECTED && |
1895 | !(sk->sk_state == BT_CONNECT2 && |
1896 | bt_sk(sk)->defer_setup)) { |
1897 | err = -ENOTCONN; |
1898 | break; |
1899 | } |
1900 | |
1901 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; |
1902 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); |
1903 | |
1904 | len = min_t(unsigned int, len, sizeof(cinfo)); |
1905 | if (copy_to_user(optval, (char *) &cinfo, len)) |
1906 | err = -EFAULT; |
1907 | |
1908 | break; |
1909 | |
1910 | default: |
1911 | err = -ENOPROTOOPT; |
1912 | break; |
1913 | } |
1914 | |
1915 | release_sock(sk); |
1916 | return err; |
1917 | } |
1918 | |
1919 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
1920 | { |
1921 | struct sock *sk = sock->sk; |
1922 | struct bt_security sec; |
1923 | int len, err = 0; |
1924 | |
1925 | BT_DBG("sk %p", sk); |
1926 | |
1927 | if (level == SOL_L2CAP) |
1928 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); |
1929 | |
1930 | if (level != SOL_BLUETOOTH) |
1931 | return -ENOPROTOOPT; |
1932 | |
1933 | if (get_user(len, optlen)) |
1934 | return -EFAULT; |
1935 | |
1936 | lock_sock(sk); |
1937 | |
1938 | switch (optname) { |
1939 | case BT_SECURITY: |
1940 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) { |
1941 | err = -EINVAL; |
1942 | break; |
1943 | } |
1944 | |
1945 | sec.level = l2cap_pi(sk)->sec_level; |
1946 | |
1947 | len = min_t(unsigned int, len, sizeof(sec)); |
1948 | if (copy_to_user(optval, (char *) &sec, len)) |
1949 | err = -EFAULT; |
1950 | |
1951 | break; |
1952 | |
1953 | case BT_DEFER_SETUP: |
1954 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { |
1955 | err = -EINVAL; |
1956 | break; |
1957 | } |
1958 | |
1959 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) |
1960 | err = -EFAULT; |
1961 | |
1962 | break; |
1963 | |
1964 | default: |
1965 | err = -ENOPROTOOPT; |
1966 | break; |
1967 | } |
1968 | |
1969 | release_sock(sk); |
1970 | return err; |
1971 | } |
1972 | |
1973 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
1974 | { |
1975 | struct sock *sk = sock->sk; |
1976 | int err = 0; |
1977 | |
1978 | BT_DBG("sock %p, sk %p", sock, sk); |
1979 | |
1980 | if (!sk) |
1981 | return 0; |
1982 | |
1983 | lock_sock(sk); |
1984 | if (!sk->sk_shutdown) { |
1985 | sk->sk_shutdown = SHUTDOWN_MASK; |
1986 | l2cap_sock_clear_timer(sk); |
1987 | __l2cap_sock_close(sk, 0); |
1988 | |
1989 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
1990 | err = bt_sock_wait_state(sk, BT_CLOSED, |
1991 | sk->sk_lingertime); |
1992 | } |
1993 | release_sock(sk); |
1994 | return err; |
1995 | } |
1996 | |
1997 | static int l2cap_sock_release(struct socket *sock) |
1998 | { |
1999 | struct sock *sk = sock->sk; |
2000 | int err; |
2001 | |
2002 | BT_DBG("sock %p, sk %p", sock, sk); |
2003 | |
2004 | if (!sk) |
2005 | return 0; |
2006 | |
2007 | err = l2cap_sock_shutdown(sock, 2); |
2008 | |
2009 | sock_orphan(sk); |
2010 | l2cap_sock_kill(sk); |
2011 | return err; |
2012 | } |
2013 | |
2014 | static void l2cap_chan_ready(struct sock *sk) |
2015 | { |
2016 | struct sock *parent = bt_sk(sk)->parent; |
2017 | |
2018 | BT_DBG("sk %p, parent %p", sk, parent); |
2019 | |
2020 | l2cap_pi(sk)->conf_state = 0; |
2021 | l2cap_sock_clear_timer(sk); |
2022 | |
2023 | if (!parent) { |
2024 | /* Outgoing channel. |
2025 | * Wake up socket sleeping on connect. |
2026 | */ |
2027 | sk->sk_state = BT_CONNECTED; |
2028 | sk->sk_state_change(sk); |
2029 | } else { |
2030 | /* Incoming channel. |
2031 | * Wake up socket sleeping on accept. |
2032 | */ |
2033 | parent->sk_data_ready(parent, 0); |
2034 | } |
2035 | } |
2036 | |
2037 | /* Copy frame to all raw sockets on that connection */ |
2038 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) |
2039 | { |
2040 | struct l2cap_chan_list *l = &conn->chan_list; |
2041 | struct sk_buff *nskb; |
2042 | struct sock *sk; |
2043 | |
2044 | BT_DBG("conn %p", conn); |
2045 | |
2046 | read_lock(&l->lock); |
2047 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
2048 | if (sk->sk_type != SOCK_RAW) |
2049 | continue; |
2050 | |
2051 | /* Don't send frame to the socket it came from */ |
2052 | if (skb->sk == sk) |
2053 | continue; |
2054 | nskb = skb_clone(skb, GFP_ATOMIC); |
2055 | if (!nskb) |
2056 | continue; |
2057 | |
2058 | if (sock_queue_rcv_skb(sk, nskb)) |
2059 | kfree_skb(nskb); |
2060 | } |
2061 | read_unlock(&l->lock); |
2062 | } |
2063 | |
2064 | /* ---- L2CAP signalling commands ---- */ |
2065 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
2066 | u8 code, u8 ident, u16 dlen, void *data) |
2067 | { |
2068 | struct sk_buff *skb, **frag; |
2069 | struct l2cap_cmd_hdr *cmd; |
2070 | struct l2cap_hdr *lh; |
2071 | int len, count; |
2072 | |
2073 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2074 | conn, code, ident, dlen); |
2075 | |
2076 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; |
2077 | count = min_t(unsigned int, conn->mtu, len); |
2078 | |
2079 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
2080 | if (!skb) |
2081 | return NULL; |
2082 | |
2083 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
2084 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
2085 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
2086 | |
2087 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); |
2088 | cmd->code = code; |
2089 | cmd->ident = ident; |
2090 | cmd->len = cpu_to_le16(dlen); |
2091 | |
2092 | if (dlen) { |
2093 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; |
2094 | memcpy(skb_put(skb, count), data, count); |
2095 | data += count; |
2096 | } |
2097 | |
2098 | len -= skb->len; |
2099 | |
2100 | /* Continuation fragments (no L2CAP header) */ |
2101 | frag = &skb_shinfo(skb)->frag_list; |
2102 | while (len) { |
2103 | count = min_t(unsigned int, conn->mtu, len); |
2104 | |
2105 | *frag = bt_skb_alloc(count, GFP_ATOMIC); |
2106 | if (!*frag) |
2107 | goto fail; |
2108 | |
2109 | memcpy(skb_put(*frag, count), data, count); |
2110 | |
2111 | len -= count; |
2112 | data += count; |
2113 | |
2114 | frag = &(*frag)->next; |
2115 | } |
2116 | |
2117 | return skb; |
2118 | |
2119 | fail: |
2120 | kfree_skb(skb); |
2121 | return NULL; |
2122 | } |
2123 | |
2124 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) |
2125 | { |
2126 | struct l2cap_conf_opt *opt = *ptr; |
2127 | int len; |
2128 | |
2129 | len = L2CAP_CONF_OPT_SIZE + opt->len; |
2130 | *ptr += len; |
2131 | |
2132 | *type = opt->type; |
2133 | *olen = opt->len; |
2134 | |
2135 | switch (opt->len) { |
2136 | case 1: |
2137 | *val = *((u8 *) opt->val); |
2138 | break; |
2139 | |
2140 | case 2: |
2141 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
2142 | break; |
2143 | |
2144 | case 4: |
2145 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
2146 | break; |
2147 | |
2148 | default: |
2149 | *val = (unsigned long) opt->val; |
2150 | break; |
2151 | } |
2152 | |
2153 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); |
2154 | return len; |
2155 | } |
2156 | |
2157 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2158 | { |
2159 | struct l2cap_conf_opt *opt = *ptr; |
2160 | |
2161 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); |
2162 | |
2163 | opt->type = type; |
2164 | opt->len = len; |
2165 | |
2166 | switch (len) { |
2167 | case 1: |
2168 | *((u8 *) opt->val) = val; |
2169 | break; |
2170 | |
2171 | case 2: |
2172 | *((__le16 *) opt->val) = cpu_to_le16(val); |
2173 | break; |
2174 | |
2175 | case 4: |
2176 | *((__le32 *) opt->val) = cpu_to_le32(val); |
2177 | break; |
2178 | |
2179 | default: |
2180 | memcpy(opt->val, (void *) val, len); |
2181 | break; |
2182 | } |
2183 | |
2184 | *ptr += L2CAP_CONF_OPT_SIZE + len; |
2185 | } |
2186 | |
2187 | static inline void l2cap_ertm_init(struct sock *sk) |
2188 | { |
2189 | l2cap_pi(sk)->expected_ack_seq = 0; |
2190 | l2cap_pi(sk)->unacked_frames = 0; |
2191 | l2cap_pi(sk)->buffer_seq = 0; |
2192 | l2cap_pi(sk)->num_to_ack = 0; |
2193 | |
2194 | setup_timer(&l2cap_pi(sk)->retrans_timer, |
2195 | l2cap_retrans_timeout, (unsigned long) sk); |
2196 | setup_timer(&l2cap_pi(sk)->monitor_timer, |
2197 | l2cap_monitor_timeout, (unsigned long) sk); |
2198 | |
2199 | __skb_queue_head_init(SREJ_QUEUE(sk)); |
2200 | } |
2201 | |
2202 | static int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
2203 | { |
2204 | u32 local_feat_mask = l2cap_feat_mask; |
2205 | if (enable_ertm) |
2206 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
2207 | |
2208 | switch (mode) { |
2209 | case L2CAP_MODE_ERTM: |
2210 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; |
2211 | case L2CAP_MODE_STREAMING: |
2212 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; |
2213 | default: |
2214 | return 0x00; |
2215 | } |
2216 | } |
2217 | |
2218 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2219 | { |
2220 | switch (mode) { |
2221 | case L2CAP_MODE_STREAMING: |
2222 | case L2CAP_MODE_ERTM: |
2223 | if (l2cap_mode_supported(mode, remote_feat_mask)) |
2224 | return mode; |
2225 | /* fall through */ |
2226 | default: |
2227 | return L2CAP_MODE_BASIC; |
2228 | } |
2229 | } |
2230 | |
2231 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2232 | { |
2233 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2234 | struct l2cap_conf_req *req = data; |
2235 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
2236 | void *ptr = req->data; |
2237 | |
2238 | BT_DBG("sk %p", sk); |
2239 | |
2240 | if (pi->num_conf_req || pi->num_conf_rsp) |
2241 | goto done; |
2242 | |
2243 | switch (pi->mode) { |
2244 | case L2CAP_MODE_STREAMING: |
2245 | case L2CAP_MODE_ERTM: |
2246 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; |
2247 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
2248 | l2cap_send_disconn_req(pi->conn, sk); |
2249 | break; |
2250 | default: |
2251 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); |
2252 | break; |
2253 | } |
2254 | |
2255 | done: |
2256 | switch (pi->mode) { |
2257 | case L2CAP_MODE_BASIC: |
2258 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
2259 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); |
2260 | break; |
2261 | |
2262 | case L2CAP_MODE_ERTM: |
2263 | rfc.mode = L2CAP_MODE_ERTM; |
2264 | rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW; |
2265 | rfc.max_transmit = max_transmit; |
2266 | rfc.retrans_timeout = 0; |
2267 | rfc.monitor_timeout = 0; |
2268 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
2269 | |
2270 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
2271 | sizeof(rfc), (unsigned long) &rfc); |
2272 | |
2273 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2274 | break; |
2275 | |
2276 | if (pi->fcs == L2CAP_FCS_NONE || |
2277 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
2278 | pi->fcs = L2CAP_FCS_NONE; |
2279 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); |
2280 | } |
2281 | break; |
2282 | |
2283 | case L2CAP_MODE_STREAMING: |
2284 | rfc.mode = L2CAP_MODE_STREAMING; |
2285 | rfc.txwin_size = 0; |
2286 | rfc.max_transmit = 0; |
2287 | rfc.retrans_timeout = 0; |
2288 | rfc.monitor_timeout = 0; |
2289 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
2290 | |
2291 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
2292 | sizeof(rfc), (unsigned long) &rfc); |
2293 | |
2294 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2295 | break; |
2296 | |
2297 | if (pi->fcs == L2CAP_FCS_NONE || |
2298 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
2299 | pi->fcs = L2CAP_FCS_NONE; |
2300 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); |
2301 | } |
2302 | break; |
2303 | } |
2304 | |
2305 | /* FIXME: Need actual value of the flush timeout */ |
2306 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) |
2307 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); |
2308 | |
2309 | req->dcid = cpu_to_le16(pi->dcid); |
2310 | req->flags = cpu_to_le16(0); |
2311 | |
2312 | return ptr - data; |
2313 | } |
2314 | |
2315 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
2316 | { |
2317 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2318 | struct l2cap_conf_rsp *rsp = data; |
2319 | void *ptr = rsp->data; |
2320 | void *req = pi->conf_req; |
2321 | int len = pi->conf_len; |
2322 | int type, hint, olen; |
2323 | unsigned long val; |
2324 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
2325 | u16 mtu = L2CAP_DEFAULT_MTU; |
2326 | u16 result = L2CAP_CONF_SUCCESS; |
2327 | |
2328 | BT_DBG("sk %p", sk); |
2329 | |
2330 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2331 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); |
2332 | |
2333 | hint = type & L2CAP_CONF_HINT; |
2334 | type &= L2CAP_CONF_MASK; |
2335 | |
2336 | switch (type) { |
2337 | case L2CAP_CONF_MTU: |
2338 | mtu = val; |
2339 | break; |
2340 | |
2341 | case L2CAP_CONF_FLUSH_TO: |
2342 | pi->flush_to = val; |
2343 | break; |
2344 | |
2345 | case L2CAP_CONF_QOS: |
2346 | break; |
2347 | |
2348 | case L2CAP_CONF_RFC: |
2349 | if (olen == sizeof(rfc)) |
2350 | memcpy(&rfc, (void *) val, olen); |
2351 | break; |
2352 | |
2353 | case L2CAP_CONF_FCS: |
2354 | if (val == L2CAP_FCS_NONE) |
2355 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; |
2356 | |
2357 | break; |
2358 | |
2359 | default: |
2360 | if (hint) |
2361 | break; |
2362 | |
2363 | result = L2CAP_CONF_UNKNOWN; |
2364 | *((u8 *) ptr++) = type; |
2365 | break; |
2366 | } |
2367 | } |
2368 | |
2369 | if (pi->num_conf_rsp || pi->num_conf_req) |
2370 | goto done; |
2371 | |
2372 | switch (pi->mode) { |
2373 | case L2CAP_MODE_STREAMING: |
2374 | case L2CAP_MODE_ERTM: |
2375 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; |
2376 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
2377 | return -ECONNREFUSED; |
2378 | break; |
2379 | default: |
2380 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); |
2381 | break; |
2382 | } |
2383 | |
2384 | done: |
2385 | if (pi->mode != rfc.mode) { |
2386 | result = L2CAP_CONF_UNACCEPT; |
2387 | rfc.mode = pi->mode; |
2388 | |
2389 | if (pi->num_conf_rsp == 1) |
2390 | return -ECONNREFUSED; |
2391 | |
2392 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
2393 | sizeof(rfc), (unsigned long) &rfc); |
2394 | } |
2395 | |
2396 | |
2397 | if (result == L2CAP_CONF_SUCCESS) { |
2398 | /* Configure output options and let the other side know |
2399 | * which ones we don't like. */ |
2400 | |
2401 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2402 | result = L2CAP_CONF_UNACCEPT; |
2403 | else { |
2404 | pi->omtu = mtu; |
2405 | pi->conf_state |= L2CAP_CONF_MTU_DONE; |
2406 | } |
2407 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); |
2408 | |
2409 | switch (rfc.mode) { |
2410 | case L2CAP_MODE_BASIC: |
2411 | pi->fcs = L2CAP_FCS_NONE; |
2412 | pi->conf_state |= L2CAP_CONF_MODE_DONE; |
2413 | break; |
2414 | |
2415 | case L2CAP_MODE_ERTM: |
2416 | pi->remote_tx_win = rfc.txwin_size; |
2417 | pi->remote_max_tx = rfc.max_transmit; |
2418 | pi->max_pdu_size = rfc.max_pdu_size; |
2419 | |
2420 | rfc.retrans_timeout = L2CAP_DEFAULT_RETRANS_TO; |
2421 | rfc.monitor_timeout = L2CAP_DEFAULT_MONITOR_TO; |
2422 | |
2423 | pi->conf_state |= L2CAP_CONF_MODE_DONE; |
2424 | |
2425 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
2426 | sizeof(rfc), (unsigned long) &rfc); |
2427 | |
2428 | break; |
2429 | |
2430 | case L2CAP_MODE_STREAMING: |
2431 | pi->remote_tx_win = rfc.txwin_size; |
2432 | pi->max_pdu_size = rfc.max_pdu_size; |
2433 | |
2434 | pi->conf_state |= L2CAP_CONF_MODE_DONE; |
2435 | |
2436 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
2437 | sizeof(rfc), (unsigned long) &rfc); |
2438 | |
2439 | break; |
2440 | |
2441 | default: |
2442 | result = L2CAP_CONF_UNACCEPT; |
2443 | |
2444 | memset(&rfc, 0, sizeof(rfc)); |
2445 | rfc.mode = pi->mode; |
2446 | } |
2447 | |
2448 | if (result == L2CAP_CONF_SUCCESS) |
2449 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; |
2450 | } |
2451 | rsp->scid = cpu_to_le16(pi->dcid); |
2452 | rsp->result = cpu_to_le16(result); |
2453 | rsp->flags = cpu_to_le16(0x0000); |
2454 | |
2455 | return ptr - data; |
2456 | } |
2457 | |
2458 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2459 | { |
2460 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2461 | struct l2cap_conf_req *req = data; |
2462 | void *ptr = req->data; |
2463 | int type, olen; |
2464 | unsigned long val; |
2465 | struct l2cap_conf_rfc rfc; |
2466 | |
2467 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); |
2468 | |
2469 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2470 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); |
2471 | |
2472 | switch (type) { |
2473 | case L2CAP_CONF_MTU: |
2474 | if (val < L2CAP_DEFAULT_MIN_MTU) { |
2475 | *result = L2CAP_CONF_UNACCEPT; |
2476 | pi->omtu = L2CAP_DEFAULT_MIN_MTU; |
2477 | } else |
2478 | pi->omtu = val; |
2479 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); |
2480 | break; |
2481 | |
2482 | case L2CAP_CONF_FLUSH_TO: |
2483 | pi->flush_to = val; |
2484 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
2485 | 2, pi->flush_to); |
2486 | break; |
2487 | |
2488 | case L2CAP_CONF_RFC: |
2489 | if (olen == sizeof(rfc)) |
2490 | memcpy(&rfc, (void *)val, olen); |
2491 | |
2492 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && |
2493 | rfc.mode != pi->mode) |
2494 | return -ECONNREFUSED; |
2495 | |
2496 | pi->mode = rfc.mode; |
2497 | pi->fcs = 0; |
2498 | |
2499 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, |
2500 | sizeof(rfc), (unsigned long) &rfc); |
2501 | break; |
2502 | } |
2503 | } |
2504 | |
2505 | if (*result == L2CAP_CONF_SUCCESS) { |
2506 | switch (rfc.mode) { |
2507 | case L2CAP_MODE_ERTM: |
2508 | pi->remote_tx_win = rfc.txwin_size; |
2509 | pi->retrans_timeout = rfc.retrans_timeout; |
2510 | pi->monitor_timeout = rfc.monitor_timeout; |
2511 | pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size); |
2512 | break; |
2513 | case L2CAP_MODE_STREAMING: |
2514 | pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size); |
2515 | break; |
2516 | } |
2517 | } |
2518 | |
2519 | req->dcid = cpu_to_le16(pi->dcid); |
2520 | req->flags = cpu_to_le16(0x0000); |
2521 | |
2522 | return ptr - data; |
2523 | } |
2524 | |
2525 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
2526 | { |
2527 | struct l2cap_conf_rsp *rsp = data; |
2528 | void *ptr = rsp->data; |
2529 | |
2530 | BT_DBG("sk %p", sk); |
2531 | |
2532 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
2533 | rsp->result = cpu_to_le16(result); |
2534 | rsp->flags = cpu_to_le16(flags); |
2535 | |
2536 | return ptr - data; |
2537 | } |
2538 | |
2539 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2540 | { |
2541 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; |
2542 | |
2543 | if (rej->reason != 0x0000) |
2544 | return 0; |
2545 | |
2546 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && |
2547 | cmd->ident == conn->info_ident) { |
2548 | del_timer(&conn->info_timer); |
2549 | |
2550 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
2551 | conn->info_ident = 0; |
2552 | |
2553 | l2cap_conn_start(conn); |
2554 | } |
2555 | |
2556 | return 0; |
2557 | } |
2558 | |
2559 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2560 | { |
2561 | struct l2cap_chan_list *list = &conn->chan_list; |
2562 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2563 | struct l2cap_conn_rsp rsp; |
2564 | struct sock *sk, *parent; |
2565 | int result, status = L2CAP_CS_NO_INFO; |
2566 | |
2567 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); |
2568 | __le16 psm = req->psm; |
2569 | |
2570 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); |
2571 | |
2572 | /* Check if we have socket listening on psm */ |
2573 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); |
2574 | if (!parent) { |
2575 | result = L2CAP_CR_BAD_PSM; |
2576 | goto sendresp; |
2577 | } |
2578 | |
2579 | /* Check if the ACL is secure enough (if not SDP) */ |
2580 | if (psm != cpu_to_le16(0x0001) && |
2581 | !hci_conn_check_link_mode(conn->hcon)) { |
2582 | conn->disc_reason = 0x05; |
2583 | result = L2CAP_CR_SEC_BLOCK; |
2584 | goto response; |
2585 | } |
2586 | |
2587 | result = L2CAP_CR_NO_MEM; |
2588 | |
2589 | /* Check for backlog size */ |
2590 | if (sk_acceptq_is_full(parent)) { |
2591 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
2592 | goto response; |
2593 | } |
2594 | |
2595 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
2596 | if (!sk) |
2597 | goto response; |
2598 | |
2599 | write_lock_bh(&list->lock); |
2600 | |
2601 | /* Check if we already have channel with that dcid */ |
2602 | if (__l2cap_get_chan_by_dcid(list, scid)) { |
2603 | write_unlock_bh(&list->lock); |
2604 | sock_set_flag(sk, SOCK_ZAPPED); |
2605 | l2cap_sock_kill(sk); |
2606 | goto response; |
2607 | } |
2608 | |
2609 | hci_conn_hold(conn->hcon); |
2610 | |
2611 | l2cap_sock_init(sk, parent); |
2612 | bacpy(&bt_sk(sk)->src, conn->src); |
2613 | bacpy(&bt_sk(sk)->dst, conn->dst); |
2614 | l2cap_pi(sk)->psm = psm; |
2615 | l2cap_pi(sk)->dcid = scid; |
2616 | |
2617 | __l2cap_chan_add(conn, sk, parent); |
2618 | dcid = l2cap_pi(sk)->scid; |
2619 | |
2620 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
2621 | |
2622 | l2cap_pi(sk)->ident = cmd->ident; |
2623 | |
2624 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2625 | if (l2cap_check_security(sk)) { |
2626 | if (bt_sk(sk)->defer_setup) { |
2627 | sk->sk_state = BT_CONNECT2; |
2628 | result = L2CAP_CR_PEND; |
2629 | status = L2CAP_CS_AUTHOR_PEND; |
2630 | parent->sk_data_ready(parent, 0); |
2631 | } else { |
2632 | sk->sk_state = BT_CONFIG; |
2633 | result = L2CAP_CR_SUCCESS; |
2634 | status = L2CAP_CS_NO_INFO; |
2635 | } |
2636 | } else { |
2637 | sk->sk_state = BT_CONNECT2; |
2638 | result = L2CAP_CR_PEND; |
2639 | status = L2CAP_CS_AUTHEN_PEND; |
2640 | } |
2641 | } else { |
2642 | sk->sk_state = BT_CONNECT2; |
2643 | result = L2CAP_CR_PEND; |
2644 | status = L2CAP_CS_NO_INFO; |
2645 | } |
2646 | |
2647 | write_unlock_bh(&list->lock); |
2648 | |
2649 | response: |
2650 | bh_unlock_sock(parent); |
2651 | |
2652 | sendresp: |
2653 | rsp.scid = cpu_to_le16(scid); |
2654 | rsp.dcid = cpu_to_le16(dcid); |
2655 | rsp.result = cpu_to_le16(result); |
2656 | rsp.status = cpu_to_le16(status); |
2657 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
2658 | |
2659 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { |
2660 | struct l2cap_info_req info; |
2661 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
2662 | |
2663 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; |
2664 | conn->info_ident = l2cap_get_ident(conn); |
2665 | |
2666 | mod_timer(&conn->info_timer, jiffies + |
2667 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); |
2668 | |
2669 | l2cap_send_cmd(conn, conn->info_ident, |
2670 | L2CAP_INFO_REQ, sizeof(info), &info); |
2671 | } |
2672 | |
2673 | return 0; |
2674 | } |
2675 | |
2676 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2677 | { |
2678 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; |
2679 | u16 scid, dcid, result, status; |
2680 | struct sock *sk; |
2681 | u8 req[128]; |
2682 | |
2683 | scid = __le16_to_cpu(rsp->scid); |
2684 | dcid = __le16_to_cpu(rsp->dcid); |
2685 | result = __le16_to_cpu(rsp->result); |
2686 | status = __le16_to_cpu(rsp->status); |
2687 | |
2688 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); |
2689 | |
2690 | if (scid) { |
2691 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2692 | if (!sk) |
2693 | return 0; |
2694 | } else { |
2695 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2696 | if (!sk) |
2697 | return 0; |
2698 | } |
2699 | |
2700 | switch (result) { |
2701 | case L2CAP_CR_SUCCESS: |
2702 | sk->sk_state = BT_CONFIG; |
2703 | l2cap_pi(sk)->ident = 0; |
2704 | l2cap_pi(sk)->dcid = dcid; |
2705 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
2706 | |
2707 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2708 | |
2709 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2710 | l2cap_build_conf_req(sk, req), req); |
2711 | l2cap_pi(sk)->num_conf_req++; |
2712 | break; |
2713 | |
2714 | case L2CAP_CR_PEND: |
2715 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
2716 | break; |
2717 | |
2718 | default: |
2719 | l2cap_chan_del(sk, ECONNREFUSED); |
2720 | break; |
2721 | } |
2722 | |
2723 | bh_unlock_sock(sk); |
2724 | return 0; |
2725 | } |
2726 | |
2727 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
2728 | { |
2729 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; |
2730 | u16 dcid, flags; |
2731 | u8 rsp[64]; |
2732 | struct sock *sk; |
2733 | int len; |
2734 | |
2735 | dcid = __le16_to_cpu(req->dcid); |
2736 | flags = __le16_to_cpu(req->flags); |
2737 | |
2738 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); |
2739 | |
2740 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2741 | if (!sk) |
2742 | return -ENOENT; |
2743 | |
2744 | if (sk->sk_state == BT_DISCONN) |
2745 | goto unlock; |
2746 | |
2747 | /* Reject if config buffer is too small. */ |
2748 | len = cmd_len - sizeof(*req); |
2749 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2750 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2751 | l2cap_build_conf_rsp(sk, rsp, |
2752 | L2CAP_CONF_REJECT, flags), rsp); |
2753 | goto unlock; |
2754 | } |
2755 | |
2756 | /* Store config. */ |
2757 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); |
2758 | l2cap_pi(sk)->conf_len += len; |
2759 | |
2760 | if (flags & 0x0001) { |
2761 | /* Incomplete config. Send empty response. */ |
2762 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2763 | l2cap_build_conf_rsp(sk, rsp, |
2764 | L2CAP_CONF_SUCCESS, 0x0001), rsp); |
2765 | goto unlock; |
2766 | } |
2767 | |
2768 | /* Complete config. */ |
2769 | len = l2cap_parse_conf_req(sk, rsp); |
2770 | if (len < 0) { |
2771 | l2cap_send_disconn_req(conn, sk); |
2772 | goto unlock; |
2773 | } |
2774 | |
2775 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
2776 | l2cap_pi(sk)->num_conf_rsp++; |
2777 | |
2778 | /* Reset config buffer. */ |
2779 | l2cap_pi(sk)->conf_len = 0; |
2780 | |
2781 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2782 | goto unlock; |
2783 | |
2784 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
2785 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
2786 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) |
2787 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
2788 | |
2789 | sk->sk_state = BT_CONNECTED; |
2790 | |
2791 | l2cap_pi(sk)->next_tx_seq = 0; |
2792 | l2cap_pi(sk)->expected_tx_seq = 0; |
2793 | __skb_queue_head_init(TX_QUEUE(sk)); |
2794 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2795 | l2cap_ertm_init(sk); |
2796 | |
2797 | l2cap_chan_ready(sk); |
2798 | goto unlock; |
2799 | } |
2800 | |
2801 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { |
2802 | u8 buf[64]; |
2803 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2804 | l2cap_build_conf_req(sk, buf), buf); |
2805 | l2cap_pi(sk)->num_conf_req++; |
2806 | } |
2807 | |
2808 | unlock: |
2809 | bh_unlock_sock(sk); |
2810 | return 0; |
2811 | } |
2812 | |
2813 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2814 | { |
2815 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; |
2816 | u16 scid, flags, result; |
2817 | struct sock *sk; |
2818 | |
2819 | scid = __le16_to_cpu(rsp->scid); |
2820 | flags = __le16_to_cpu(rsp->flags); |
2821 | result = __le16_to_cpu(rsp->result); |
2822 | |
2823 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2824 | scid, flags, result); |
2825 | |
2826 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2827 | if (!sk) |
2828 | return 0; |
2829 | |
2830 | switch (result) { |
2831 | case L2CAP_CONF_SUCCESS: |
2832 | break; |
2833 | |
2834 | case L2CAP_CONF_UNACCEPT: |
2835 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
2836 | int len = cmd->len - sizeof(*rsp); |
2837 | char req[64]; |
2838 | |
2839 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
2840 | l2cap_send_disconn_req(conn, sk); |
2841 | goto done; |
2842 | } |
2843 | |
2844 | /* throw out any old stored conf requests */ |
2845 | result = L2CAP_CONF_SUCCESS; |
2846 | len = l2cap_parse_conf_rsp(sk, rsp->data, |
2847 | len, req, &result); |
2848 | if (len < 0) { |
2849 | l2cap_send_disconn_req(conn, sk); |
2850 | goto done; |
2851 | } |
2852 | |
2853 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
2854 | L2CAP_CONF_REQ, len, req); |
2855 | l2cap_pi(sk)->num_conf_req++; |
2856 | if (result != L2CAP_CONF_SUCCESS) |
2857 | goto done; |
2858 | break; |
2859 | } |
2860 | |
2861 | default: |
2862 | sk->sk_state = BT_DISCONN; |
2863 | sk->sk_err = ECONNRESET; |
2864 | l2cap_sock_set_timer(sk, HZ * 5); |
2865 | l2cap_send_disconn_req(conn, sk); |
2866 | goto done; |
2867 | } |
2868 | |
2869 | if (flags & 0x01) |
2870 | goto done; |
2871 | |
2872 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2873 | |
2874 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { |
2875 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
2876 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) |
2877 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
2878 | |
2879 | sk->sk_state = BT_CONNECTED; |
2880 | l2cap_pi(sk)->next_tx_seq = 0; |
2881 | l2cap_pi(sk)->expected_tx_seq = 0; |
2882 | __skb_queue_head_init(TX_QUEUE(sk)); |
2883 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2884 | l2cap_ertm_init(sk); |
2885 | |
2886 | l2cap_chan_ready(sk); |
2887 | } |
2888 | |
2889 | done: |
2890 | bh_unlock_sock(sk); |
2891 | return 0; |
2892 | } |
2893 | |
2894 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2895 | { |
2896 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; |
2897 | struct l2cap_disconn_rsp rsp; |
2898 | u16 dcid, scid; |
2899 | struct sock *sk; |
2900 | |
2901 | scid = __le16_to_cpu(req->scid); |
2902 | dcid = __le16_to_cpu(req->dcid); |
2903 | |
2904 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); |
2905 | |
2906 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2907 | if (!sk) |
2908 | return 0; |
2909 | |
2910 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2911 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
2912 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2913 | |
2914 | sk->sk_shutdown = SHUTDOWN_MASK; |
2915 | |
2916 | skb_queue_purge(TX_QUEUE(sk)); |
2917 | |
2918 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { |
2919 | skb_queue_purge(SREJ_QUEUE(sk)); |
2920 | del_timer(&l2cap_pi(sk)->retrans_timer); |
2921 | del_timer(&l2cap_pi(sk)->monitor_timer); |
2922 | } |
2923 | |
2924 | l2cap_chan_del(sk, ECONNRESET); |
2925 | bh_unlock_sock(sk); |
2926 | |
2927 | l2cap_sock_kill(sk); |
2928 | return 0; |
2929 | } |
2930 | |
2931 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2932 | { |
2933 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; |
2934 | u16 dcid, scid; |
2935 | struct sock *sk; |
2936 | |
2937 | scid = __le16_to_cpu(rsp->scid); |
2938 | dcid = __le16_to_cpu(rsp->dcid); |
2939 | |
2940 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); |
2941 | |
2942 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2943 | if (!sk) |
2944 | return 0; |
2945 | |
2946 | skb_queue_purge(TX_QUEUE(sk)); |
2947 | |
2948 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { |
2949 | skb_queue_purge(SREJ_QUEUE(sk)); |
2950 | del_timer(&l2cap_pi(sk)->retrans_timer); |
2951 | del_timer(&l2cap_pi(sk)->monitor_timer); |
2952 | } |
2953 | |
2954 | l2cap_chan_del(sk, 0); |
2955 | bh_unlock_sock(sk); |
2956 | |
2957 | l2cap_sock_kill(sk); |
2958 | return 0; |
2959 | } |
2960 | |
2961 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2962 | { |
2963 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; |
2964 | u16 type; |
2965 | |
2966 | type = __le16_to_cpu(req->type); |
2967 | |
2968 | BT_DBG("type 0x%4.4x", type); |
2969 | |
2970 | if (type == L2CAP_IT_FEAT_MASK) { |
2971 | u8 buf[8]; |
2972 | u32 feat_mask = l2cap_feat_mask; |
2973 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2974 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); |
2975 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); |
2976 | if (enable_ertm) |
2977 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2978 | | L2CAP_FEAT_FCS; |
2979 | put_unaligned_le32(feat_mask, rsp->data); |
2980 | l2cap_send_cmd(conn, cmd->ident, |
2981 | L2CAP_INFO_RSP, sizeof(buf), buf); |
2982 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2983 | u8 buf[12]; |
2984 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2985 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
2986 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); |
2987 | memcpy(buf + 4, l2cap_fixed_chan, 8); |
2988 | l2cap_send_cmd(conn, cmd->ident, |
2989 | L2CAP_INFO_RSP, sizeof(buf), buf); |
2990 | } else { |
2991 | struct l2cap_info_rsp rsp; |
2992 | rsp.type = cpu_to_le16(type); |
2993 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); |
2994 | l2cap_send_cmd(conn, cmd->ident, |
2995 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); |
2996 | } |
2997 | |
2998 | return 0; |
2999 | } |
3000 | |
3001 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
3002 | { |
3003 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; |
3004 | u16 type, result; |
3005 | |
3006 | type = __le16_to_cpu(rsp->type); |
3007 | result = __le16_to_cpu(rsp->result); |
3008 | |
3009 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); |
3010 | |
3011 | del_timer(&conn->info_timer); |
3012 | |
3013 | if (type == L2CAP_IT_FEAT_MASK) { |
3014 | conn->feat_mask = get_unaligned_le32(rsp->data); |
3015 | |
3016 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
3017 | struct l2cap_info_req req; |
3018 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); |
3019 | |
3020 | conn->info_ident = l2cap_get_ident(conn); |
3021 | |
3022 | l2cap_send_cmd(conn, conn->info_ident, |
3023 | L2CAP_INFO_REQ, sizeof(req), &req); |
3024 | } else { |
3025 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
3026 | conn->info_ident = 0; |
3027 | |
3028 | l2cap_conn_start(conn); |
3029 | } |
3030 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3031 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
3032 | conn->info_ident = 0; |
3033 | |
3034 | l2cap_conn_start(conn); |
3035 | } |
3036 | |
3037 | return 0; |
3038 | } |
3039 | |
3040 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
3041 | { |
3042 | u8 *data = skb->data; |
3043 | int len = skb->len; |
3044 | struct l2cap_cmd_hdr cmd; |
3045 | int err = 0; |
3046 | |
3047 | l2cap_raw_recv(conn, skb); |
3048 | |
3049 | while (len >= L2CAP_CMD_HDR_SIZE) { |
3050 | u16 cmd_len; |
3051 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3052 | data += L2CAP_CMD_HDR_SIZE; |
3053 | len -= L2CAP_CMD_HDR_SIZE; |
3054 | |
3055 | cmd_len = le16_to_cpu(cmd.len); |
3056 | |
3057 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
3058 | |
3059 | if (cmd_len > len || !cmd.ident) { |
3060 | BT_DBG("corrupted command"); |
3061 | break; |
3062 | } |
3063 | |
3064 | switch (cmd.code) { |
3065 | case L2CAP_COMMAND_REJ: |
3066 | l2cap_command_rej(conn, &cmd, data); |
3067 | break; |
3068 | |
3069 | case L2CAP_CONN_REQ: |
3070 | err = l2cap_connect_req(conn, &cmd, data); |
3071 | break; |
3072 | |
3073 | case L2CAP_CONN_RSP: |
3074 | err = l2cap_connect_rsp(conn, &cmd, data); |
3075 | break; |
3076 | |
3077 | case L2CAP_CONF_REQ: |
3078 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
3079 | break; |
3080 | |
3081 | case L2CAP_CONF_RSP: |
3082 | err = l2cap_config_rsp(conn, &cmd, data); |
3083 | break; |
3084 | |
3085 | case L2CAP_DISCONN_REQ: |
3086 | err = l2cap_disconnect_req(conn, &cmd, data); |
3087 | break; |
3088 | |
3089 | case L2CAP_DISCONN_RSP: |
3090 | err = l2cap_disconnect_rsp(conn, &cmd, data); |
3091 | break; |
3092 | |
3093 | case L2CAP_ECHO_REQ: |
3094 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
3095 | break; |
3096 | |
3097 | case L2CAP_ECHO_RSP: |
3098 | break; |
3099 | |
3100 | case L2CAP_INFO_REQ: |
3101 | err = l2cap_information_req(conn, &cmd, data); |
3102 | break; |
3103 | |
3104 | case L2CAP_INFO_RSP: |
3105 | err = l2cap_information_rsp(conn, &cmd, data); |
3106 | break; |
3107 | |
3108 | default: |
3109 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); |
3110 | err = -EINVAL; |
3111 | break; |
3112 | } |
3113 | |
3114 | if (err) { |
3115 | struct l2cap_cmd_rej rej; |
3116 | BT_DBG("error %d", err); |
3117 | |
3118 | /* FIXME: Map err to a valid reason */ |
3119 | rej.reason = cpu_to_le16(0); |
3120 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3121 | } |
3122 | |
3123 | data += cmd_len; |
3124 | len -= cmd_len; |
3125 | } |
3126 | |
3127 | kfree_skb(skb); |
3128 | } |
3129 | |
3130 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3131 | { |
3132 | u16 our_fcs, rcv_fcs; |
3133 | int hdr_size = L2CAP_HDR_SIZE + 2; |
3134 | |
3135 | if (pi->fcs == L2CAP_FCS_CRC16) { |
3136 | skb_trim(skb, skb->len - 2); |
3137 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); |
3138 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); |
3139 | |
3140 | if (our_fcs != rcv_fcs) |
3141 | return -EINVAL; |
3142 | } |
3143 | return 0; |
3144 | } |
3145 | |
3146 | static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
3147 | { |
3148 | struct sk_buff *next_skb; |
3149 | |
3150 | bt_cb(skb)->tx_seq = tx_seq; |
3151 | bt_cb(skb)->sar = sar; |
3152 | |
3153 | next_skb = skb_peek(SREJ_QUEUE(sk)); |
3154 | if (!next_skb) { |
3155 | __skb_queue_tail(SREJ_QUEUE(sk), skb); |
3156 | return; |
3157 | } |
3158 | |
3159 | do { |
3160 | if (bt_cb(next_skb)->tx_seq > tx_seq) { |
3161 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
3162 | return; |
3163 | } |
3164 | |
3165 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) |
3166 | break; |
3167 | |
3168 | } while((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
3169 | |
3170 | __skb_queue_tail(SREJ_QUEUE(sk), skb); |
3171 | } |
3172 | |
3173 | static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3174 | { |
3175 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3176 | struct sk_buff *_skb; |
3177 | int err = -EINVAL; |
3178 | |
3179 | switch (control & L2CAP_CTRL_SAR) { |
3180 | case L2CAP_SDU_UNSEGMENTED: |
3181 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { |
3182 | kfree_skb(pi->sdu); |
3183 | break; |
3184 | } |
3185 | |
3186 | err = sock_queue_rcv_skb(sk, skb); |
3187 | if (!err) |
3188 | return 0; |
3189 | |
3190 | break; |
3191 | |
3192 | case L2CAP_SDU_START: |
3193 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { |
3194 | kfree_skb(pi->sdu); |
3195 | break; |
3196 | } |
3197 | |
3198 | pi->sdu_len = get_unaligned_le16(skb->data); |
3199 | skb_pull(skb, 2); |
3200 | |
3201 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3202 | if (!pi->sdu) { |
3203 | err = -ENOMEM; |
3204 | break; |
3205 | } |
3206 | |
3207 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3208 | |
3209 | pi->conn_state |= L2CAP_CONN_SAR_SDU; |
3210 | pi->partial_sdu_len = skb->len; |
3211 | err = 0; |
3212 | break; |
3213 | |
3214 | case L2CAP_SDU_CONTINUE: |
3215 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) |
3216 | break; |
3217 | |
3218 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3219 | |
3220 | pi->partial_sdu_len += skb->len; |
3221 | if (pi->partial_sdu_len > pi->sdu_len) |
3222 | kfree_skb(pi->sdu); |
3223 | else |
3224 | err = 0; |
3225 | |
3226 | break; |
3227 | |
3228 | case L2CAP_SDU_END: |
3229 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) |
3230 | break; |
3231 | |
3232 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3233 | |
3234 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; |
3235 | pi->partial_sdu_len += skb->len; |
3236 | |
3237 | if (pi->partial_sdu_len == pi->sdu_len) { |
3238 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); |
3239 | err = sock_queue_rcv_skb(sk, _skb); |
3240 | if (err < 0) |
3241 | kfree_skb(_skb); |
3242 | } |
3243 | kfree_skb(pi->sdu); |
3244 | err = 0; |
3245 | |
3246 | break; |
3247 | } |
3248 | |
3249 | kfree_skb(skb); |
3250 | return err; |
3251 | } |
3252 | |
3253 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3254 | { |
3255 | struct sk_buff *skb; |
3256 | u16 control = 0; |
3257 | |
3258 | while((skb = skb_peek(SREJ_QUEUE(sk)))) { |
3259 | if (bt_cb(skb)->tx_seq != tx_seq) |
3260 | break; |
3261 | |
3262 | skb = skb_dequeue(SREJ_QUEUE(sk)); |
3263 | control |= bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
3264 | l2cap_sar_reassembly_sdu(sk, skb, control); |
3265 | l2cap_pi(sk)->buffer_seq_srej = |
3266 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; |
3267 | tx_seq++; |
3268 | } |
3269 | } |
3270 | |
3271 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) |
3272 | { |
3273 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3274 | struct srej_list *l, *tmp; |
3275 | u16 control; |
3276 | |
3277 | list_for_each_entry_safe(l,tmp, SREJ_LIST(sk), list) { |
3278 | if (l->tx_seq == tx_seq) { |
3279 | list_del(&l->list); |
3280 | kfree(l); |
3281 | return; |
3282 | } |
3283 | control = L2CAP_SUPER_SELECT_REJECT; |
3284 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
3285 | l2cap_send_sframe(pi, control); |
3286 | list_del(&l->list); |
3287 | list_add_tail(&l->list, SREJ_LIST(sk)); |
3288 | } |
3289 | } |
3290 | |
3291 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) |
3292 | { |
3293 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3294 | struct srej_list *new; |
3295 | u16 control; |
3296 | |
3297 | while (tx_seq != pi->expected_tx_seq) { |
3298 | control = L2CAP_SUPER_SELECT_REJECT; |
3299 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
3300 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
3301 | control |= L2CAP_CTRL_POLL; |
3302 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; |
3303 | } |
3304 | l2cap_send_sframe(pi, control); |
3305 | |
3306 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); |
3307 | new->tx_seq = pi->expected_tx_seq++; |
3308 | list_add_tail(&new->list, SREJ_LIST(sk)); |
3309 | } |
3310 | pi->expected_tx_seq++; |
3311 | } |
3312 | |
3313 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3314 | { |
3315 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3316 | u8 tx_seq = __get_txseq(rx_control); |
3317 | u8 req_seq = __get_reqseq(rx_control); |
3318 | u16 tx_control = 0; |
3319 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
3320 | int err = 0; |
3321 | |
3322 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); |
3323 | |
3324 | pi->expected_ack_seq = req_seq; |
3325 | l2cap_drop_acked_frames(sk); |
3326 | |
3327 | if (tx_seq == pi->expected_tx_seq) |
3328 | goto expected; |
3329 | |
3330 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3331 | struct srej_list *first; |
3332 | |
3333 | first = list_first_entry(SREJ_LIST(sk), |
3334 | struct srej_list, list); |
3335 | if (tx_seq == first->tx_seq) { |
3336 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3337 | l2cap_check_srej_gap(sk, tx_seq); |
3338 | |
3339 | list_del(&first->list); |
3340 | kfree(first); |
3341 | |
3342 | if (list_empty(SREJ_LIST(sk))) { |
3343 | pi->buffer_seq = pi->buffer_seq_srej; |
3344 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; |
3345 | } |
3346 | } else { |
3347 | struct srej_list *l; |
3348 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3349 | |
3350 | list_for_each_entry(l, SREJ_LIST(sk), list) { |
3351 | if (l->tx_seq == tx_seq) { |
3352 | l2cap_resend_srejframe(sk, tx_seq); |
3353 | return 0; |
3354 | } |
3355 | } |
3356 | l2cap_send_srejframe(sk, tx_seq); |
3357 | } |
3358 | } else { |
3359 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
3360 | |
3361 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3362 | pi->buffer_seq_srej = pi->buffer_seq; |
3363 | |
3364 | __skb_queue_head_init(SREJ_QUEUE(sk)); |
3365 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3366 | |
3367 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3368 | |
3369 | l2cap_send_srejframe(sk, tx_seq); |
3370 | } |
3371 | return 0; |
3372 | |
3373 | expected: |
3374 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
3375 | |
3376 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3377 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3378 | return 0; |
3379 | } |
3380 | |
3381 | if (rx_control & L2CAP_CTRL_FINAL) { |
3382 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3383 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; |
3384 | else { |
3385 | sk->sk_send_head = TX_QUEUE(sk)->next; |
3386 | pi->next_tx_seq = pi->expected_ack_seq; |
3387 | l2cap_ertm_send(sk); |
3388 | } |
3389 | } |
3390 | |
3391 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; |
3392 | |
3393 | err = l2cap_sar_reassembly_sdu(sk, skb, rx_control); |
3394 | if (err < 0) |
3395 | return err; |
3396 | |
3397 | pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK; |
3398 | if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1) { |
3399 | tx_control |= L2CAP_SUPER_RCV_READY; |
3400 | tx_control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
3401 | l2cap_send_sframe(pi, tx_control); |
3402 | } |
3403 | return 0; |
3404 | } |
3405 | |
3406 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3407 | { |
3408 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3409 | u8 tx_seq = __get_reqseq(rx_control); |
3410 | |
3411 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); |
3412 | |
3413 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { |
3414 | case L2CAP_SUPER_RCV_READY: |
3415 | if (rx_control & L2CAP_CTRL_POLL) { |
3416 | u16 control = L2CAP_CTRL_FINAL; |
3417 | control |= L2CAP_SUPER_RCV_READY | |
3418 | (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT); |
3419 | l2cap_send_sframe(l2cap_pi(sk), control); |
3420 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3421 | |
3422 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3423 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3424 | pi->expected_ack_seq = tx_seq; |
3425 | l2cap_drop_acked_frames(sk); |
3426 | |
3427 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3428 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; |
3429 | else { |
3430 | sk->sk_send_head = TX_QUEUE(sk)->next; |
3431 | pi->next_tx_seq = pi->expected_ack_seq; |
3432 | l2cap_ertm_send(sk); |
3433 | } |
3434 | |
3435 | if (!(pi->conn_state & L2CAP_CONN_WAIT_F)) |
3436 | break; |
3437 | |
3438 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; |
3439 | del_timer(&pi->monitor_timer); |
3440 | |
3441 | if (pi->unacked_frames > 0) |
3442 | __mod_retrans_timer(); |
3443 | } else { |
3444 | pi->expected_ack_seq = tx_seq; |
3445 | l2cap_drop_acked_frames(sk); |
3446 | |
3447 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3448 | (pi->unacked_frames > 0)) |
3449 | __mod_retrans_timer(); |
3450 | |
3451 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3452 | l2cap_ertm_send(sk); |
3453 | } |
3454 | break; |
3455 | |
3456 | case L2CAP_SUPER_REJECT: |
3457 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3458 | |
3459 | pi->expected_ack_seq = __get_reqseq(rx_control); |
3460 | l2cap_drop_acked_frames(sk); |
3461 | |
3462 | if (rx_control & L2CAP_CTRL_FINAL) { |
3463 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3464 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; |
3465 | else { |
3466 | sk->sk_send_head = TX_QUEUE(sk)->next; |
3467 | pi->next_tx_seq = pi->expected_ack_seq; |
3468 | l2cap_ertm_send(sk); |
3469 | } |
3470 | } else { |
3471 | sk->sk_send_head = TX_QUEUE(sk)->next; |
3472 | pi->next_tx_seq = pi->expected_ack_seq; |
3473 | l2cap_ertm_send(sk); |
3474 | |
3475 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3476 | pi->srej_save_reqseq = tx_seq; |
3477 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
3478 | } |
3479 | } |
3480 | |
3481 | break; |
3482 | |
3483 | case L2CAP_SUPER_SELECT_REJECT: |
3484 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3485 | |
3486 | if (rx_control & L2CAP_CTRL_POLL) { |
3487 | pi->expected_ack_seq = tx_seq; |
3488 | l2cap_drop_acked_frames(sk); |
3489 | l2cap_retransmit_frame(sk, tx_seq); |
3490 | l2cap_ertm_send(sk); |
3491 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3492 | pi->srej_save_reqseq = tx_seq; |
3493 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; |
3494 | } |
3495 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3496 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && |
3497 | pi->srej_save_reqseq == tx_seq) |
3498 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; |
3499 | else |
3500 | l2cap_retransmit_frame(sk, tx_seq); |
3501 | } |
3502 | else { |
3503 | l2cap_retransmit_frame(sk, tx_seq); |
3504 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3505 | pi->srej_save_reqseq = tx_seq; |
3506 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; |
3507 | } |
3508 | } |
3509 | break; |
3510 | |
3511 | case L2CAP_SUPER_RCV_NOT_READY: |
3512 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
3513 | pi->expected_ack_seq = tx_seq; |
3514 | l2cap_drop_acked_frames(sk); |
3515 | |
3516 | del_timer(&l2cap_pi(sk)->retrans_timer); |
3517 | if (rx_control & L2CAP_CTRL_POLL) { |
3518 | u16 control = L2CAP_CTRL_FINAL; |
3519 | l2cap_send_rr_or_rnr(l2cap_pi(sk), control); |
3520 | } |
3521 | break; |
3522 | } |
3523 | |
3524 | return 0; |
3525 | } |
3526 | |
3527 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3528 | { |
3529 | struct sock *sk; |
3530 | struct l2cap_pinfo *pi; |
3531 | u16 control, len; |
3532 | u8 tx_seq; |
3533 | |
3534 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); |
3535 | if (!sk) { |
3536 | BT_DBG("unknown cid 0x%4.4x", cid); |
3537 | goto drop; |
3538 | } |
3539 | |
3540 | pi = l2cap_pi(sk); |
3541 | |
3542 | BT_DBG("sk %p, len %d", sk, skb->len); |
3543 | |
3544 | if (sk->sk_state != BT_CONNECTED) |
3545 | goto drop; |
3546 | |
3547 | switch (pi->mode) { |
3548 | case L2CAP_MODE_BASIC: |
3549 | /* If socket recv buffers overflows we drop data here |
3550 | * which is *bad* because L2CAP has to be reliable. |
3551 | * But we don't have any other choice. L2CAP doesn't |
3552 | * provide flow control mechanism. */ |
3553 | |
3554 | if (pi->imtu < skb->len) |
3555 | goto drop; |
3556 | |
3557 | if (!sock_queue_rcv_skb(sk, skb)) |
3558 | goto done; |
3559 | break; |
3560 | |
3561 | case L2CAP_MODE_ERTM: |
3562 | control = get_unaligned_le16(skb->data); |
3563 | skb_pull(skb, 2); |
3564 | len = skb->len; |
3565 | |
3566 | if (__is_sar_start(control)) |
3567 | len -= 2; |
3568 | |
3569 | if (pi->fcs == L2CAP_FCS_CRC16) |
3570 | len -= 2; |
3571 | |
3572 | /* |
3573 | * We can just drop the corrupted I-frame here. |
3574 | * Receiver will miss it and start proper recovery |
3575 | * procedures and ask retransmission. |
3576 | */ |
3577 | if (len > L2CAP_DEFAULT_MAX_PDU_SIZE) |
3578 | goto drop; |
3579 | |
3580 | if (l2cap_check_fcs(pi, skb)) |
3581 | goto drop; |
3582 | |
3583 | if (__is_iframe(control)) |
3584 | l2cap_data_channel_iframe(sk, control, skb); |
3585 | else |
3586 | l2cap_data_channel_sframe(sk, control, skb); |
3587 | |
3588 | goto done; |
3589 | |
3590 | case L2CAP_MODE_STREAMING: |
3591 | control = get_unaligned_le16(skb->data); |
3592 | skb_pull(skb, 2); |
3593 | len = skb->len; |
3594 | |
3595 | if (__is_sar_start(control)) |
3596 | len -= 2; |
3597 | |
3598 | if (pi->fcs == L2CAP_FCS_CRC16) |
3599 | len -= 2; |
3600 | |
3601 | if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || __is_sframe(control)) |
3602 | goto drop; |
3603 | |
3604 | if (l2cap_check_fcs(pi, skb)) |
3605 | goto drop; |
3606 | |
3607 | tx_seq = __get_txseq(control); |
3608 | |
3609 | if (pi->expected_tx_seq == tx_seq) |
3610 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
3611 | else |
3612 | pi->expected_tx_seq = tx_seq + 1; |
3613 | |
3614 | l2cap_sar_reassembly_sdu(sk, skb, control); |
3615 | |
3616 | goto done; |
3617 | |
3618 | default: |
3619 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, l2cap_pi(sk)->mode); |
3620 | break; |
3621 | } |
3622 | |
3623 | drop: |
3624 | kfree_skb(skb); |
3625 | |
3626 | done: |
3627 | if (sk) |
3628 | bh_unlock_sock(sk); |
3629 | |
3630 | return 0; |
3631 | } |
3632 | |
3633 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
3634 | { |
3635 | struct sock *sk; |
3636 | |
3637 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); |
3638 | if (!sk) |
3639 | goto drop; |
3640 | |
3641 | BT_DBG("sk %p, len %d", sk, skb->len); |
3642 | |
3643 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) |
3644 | goto drop; |
3645 | |
3646 | if (l2cap_pi(sk)->imtu < skb->len) |
3647 | goto drop; |
3648 | |
3649 | if (!sock_queue_rcv_skb(sk, skb)) |
3650 | goto done; |
3651 | |
3652 | drop: |
3653 | kfree_skb(skb); |
3654 | |
3655 | done: |
3656 | if (sk) |
3657 | bh_unlock_sock(sk); |
3658 | return 0; |
3659 | } |
3660 | |
3661 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
3662 | { |
3663 | struct l2cap_hdr *lh = (void *) skb->data; |
3664 | u16 cid, len; |
3665 | __le16 psm; |
3666 | |
3667 | skb_pull(skb, L2CAP_HDR_SIZE); |
3668 | cid = __le16_to_cpu(lh->cid); |
3669 | len = __le16_to_cpu(lh->len); |
3670 | |
3671 | if (len != skb->len) { |
3672 | kfree_skb(skb); |
3673 | return; |
3674 | } |
3675 | |
3676 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3677 | |
3678 | switch (cid) { |
3679 | case L2CAP_CID_SIGNALING: |
3680 | l2cap_sig_channel(conn, skb); |
3681 | break; |
3682 | |
3683 | case L2CAP_CID_CONN_LESS: |
3684 | psm = get_unaligned_le16(skb->data); |
3685 | skb_pull(skb, 2); |
3686 | l2cap_conless_channel(conn, psm, skb); |
3687 | break; |
3688 | |
3689 | default: |
3690 | l2cap_data_channel(conn, cid, skb); |
3691 | break; |
3692 | } |
3693 | } |
3694 | |
3695 | /* ---- L2CAP interface with lower layer (HCI) ---- */ |
3696 | |
3697 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) |
3698 | { |
3699 | int exact = 0, lm1 = 0, lm2 = 0; |
3700 | register struct sock *sk; |
3701 | struct hlist_node *node; |
3702 | |
3703 | if (type != ACL_LINK) |
3704 | return 0; |
3705 | |
3706 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); |
3707 | |
3708 | /* Find listening sockets and check their link_mode */ |
3709 | read_lock(&l2cap_sk_list.lock); |
3710 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
3711 | if (sk->sk_state != BT_LISTEN) |
3712 | continue; |
3713 | |
3714 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { |
3715 | lm1 |= HCI_LM_ACCEPT; |
3716 | if (l2cap_pi(sk)->role_switch) |
3717 | lm1 |= HCI_LM_MASTER; |
3718 | exact++; |
3719 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3720 | lm2 |= HCI_LM_ACCEPT; |
3721 | if (l2cap_pi(sk)->role_switch) |
3722 | lm2 |= HCI_LM_MASTER; |
3723 | } |
3724 | } |
3725 | read_unlock(&l2cap_sk_list.lock); |
3726 | |
3727 | return exact ? lm1 : lm2; |
3728 | } |
3729 | |
3730 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) |
3731 | { |
3732 | struct l2cap_conn *conn; |
3733 | |
3734 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3735 | |
3736 | if (hcon->type != ACL_LINK) |
3737 | return 0; |
3738 | |
3739 | if (!status) { |
3740 | conn = l2cap_conn_add(hcon, status); |
3741 | if (conn) |
3742 | l2cap_conn_ready(conn); |
3743 | } else |
3744 | l2cap_conn_del(hcon, bt_err(status)); |
3745 | |
3746 | return 0; |
3747 | } |
3748 | |
3749 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3750 | { |
3751 | struct l2cap_conn *conn = hcon->l2cap_data; |
3752 | |
3753 | BT_DBG("hcon %p", hcon); |
3754 | |
3755 | if (hcon->type != ACL_LINK || !conn) |
3756 | return 0x13; |
3757 | |
3758 | return conn->disc_reason; |
3759 | } |
3760 | |
3761 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) |
3762 | { |
3763 | BT_DBG("hcon %p reason %d", hcon, reason); |
3764 | |
3765 | if (hcon->type != ACL_LINK) |
3766 | return 0; |
3767 | |
3768 | l2cap_conn_del(hcon, bt_err(reason)); |
3769 | |
3770 | return 0; |
3771 | } |
3772 | |
3773 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
3774 | { |
3775 | if (sk->sk_type != SOCK_SEQPACKET) |
3776 | return; |
3777 | |
3778 | if (encrypt == 0x00) { |
3779 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { |
3780 | l2cap_sock_clear_timer(sk); |
3781 | l2cap_sock_set_timer(sk, HZ * 5); |
3782 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
3783 | __l2cap_sock_close(sk, ECONNREFUSED); |
3784 | } else { |
3785 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) |
3786 | l2cap_sock_clear_timer(sk); |
3787 | } |
3788 | } |
3789 | |
3790 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
3791 | { |
3792 | struct l2cap_chan_list *l; |
3793 | struct l2cap_conn *conn = hcon->l2cap_data; |
3794 | struct sock *sk; |
3795 | |
3796 | if (!conn) |
3797 | return 0; |
3798 | |
3799 | l = &conn->chan_list; |
3800 | |
3801 | BT_DBG("conn %p", conn); |
3802 | |
3803 | read_lock(&l->lock); |
3804 | |
3805 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
3806 | bh_lock_sock(sk); |
3807 | |
3808 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
3809 | bh_unlock_sock(sk); |
3810 | continue; |
3811 | } |
3812 | |
3813 | if (!status && (sk->sk_state == BT_CONNECTED || |
3814 | sk->sk_state == BT_CONFIG)) { |
3815 | l2cap_check_encryption(sk, encrypt); |
3816 | bh_unlock_sock(sk); |
3817 | continue; |
3818 | } |
3819 | |
3820 | if (sk->sk_state == BT_CONNECT) { |
3821 | if (!status) { |
3822 | struct l2cap_conn_req req; |
3823 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); |
3824 | req.psm = l2cap_pi(sk)->psm; |
3825 | |
3826 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
3827 | |
3828 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3829 | L2CAP_CONN_REQ, sizeof(req), &req); |
3830 | } else { |
3831 | l2cap_sock_clear_timer(sk); |
3832 | l2cap_sock_set_timer(sk, HZ / 10); |
3833 | } |
3834 | } else if (sk->sk_state == BT_CONNECT2) { |
3835 | struct l2cap_conn_rsp rsp; |
3836 | __u16 result; |
3837 | |
3838 | if (!status) { |
3839 | sk->sk_state = BT_CONFIG; |
3840 | result = L2CAP_CR_SUCCESS; |
3841 | } else { |
3842 | sk->sk_state = BT_DISCONN; |
3843 | l2cap_sock_set_timer(sk, HZ / 10); |
3844 | result = L2CAP_CR_SEC_BLOCK; |
3845 | } |
3846 | |
3847 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
3848 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3849 | rsp.result = cpu_to_le16(result); |
3850 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
3851 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3852 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
3853 | } |
3854 | |
3855 | bh_unlock_sock(sk); |
3856 | } |
3857 | |
3858 | read_unlock(&l->lock); |
3859 | |
3860 | return 0; |
3861 | } |
3862 | |
3863 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) |
3864 | { |
3865 | struct l2cap_conn *conn = hcon->l2cap_data; |
3866 | |
3867 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) |
3868 | goto drop; |
3869 | |
3870 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); |
3871 | |
3872 | if (flags & ACL_START) { |
3873 | struct l2cap_hdr *hdr; |
3874 | int len; |
3875 | |
3876 | if (conn->rx_len) { |
3877 | BT_ERR("Unexpected start frame (len %d)", skb->len); |
3878 | kfree_skb(conn->rx_skb); |
3879 | conn->rx_skb = NULL; |
3880 | conn->rx_len = 0; |
3881 | l2cap_conn_unreliable(conn, ECOMM); |
3882 | } |
3883 | |
3884 | if (skb->len < 2) { |
3885 | BT_ERR("Frame is too short (len %d)", skb->len); |
3886 | l2cap_conn_unreliable(conn, ECOMM); |
3887 | goto drop; |
3888 | } |
3889 | |
3890 | hdr = (struct l2cap_hdr *) skb->data; |
3891 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; |
3892 | |
3893 | if (len == skb->len) { |
3894 | /* Complete frame received */ |
3895 | l2cap_recv_frame(conn, skb); |
3896 | return 0; |
3897 | } |
3898 | |
3899 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); |
3900 | |
3901 | if (skb->len > len) { |
3902 | BT_ERR("Frame is too long (len %d, expected len %d)", |
3903 | skb->len, len); |
3904 | l2cap_conn_unreliable(conn, ECOMM); |
3905 | goto drop; |
3906 | } |
3907 | |
3908 | /* Allocate skb for the complete frame (with header) */ |
3909 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
3910 | if (!conn->rx_skb) |
3911 | goto drop; |
3912 | |
3913 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
3914 | skb->len); |
3915 | conn->rx_len = len - skb->len; |
3916 | } else { |
3917 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); |
3918 | |
3919 | if (!conn->rx_len) { |
3920 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); |
3921 | l2cap_conn_unreliable(conn, ECOMM); |
3922 | goto drop; |
3923 | } |
3924 | |
3925 | if (skb->len > conn->rx_len) { |
3926 | BT_ERR("Fragment is too long (len %d, expected %d)", |
3927 | skb->len, conn->rx_len); |
3928 | kfree_skb(conn->rx_skb); |
3929 | conn->rx_skb = NULL; |
3930 | conn->rx_len = 0; |
3931 | l2cap_conn_unreliable(conn, ECOMM); |
3932 | goto drop; |
3933 | } |
3934 | |
3935 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
3936 | skb->len); |
3937 | conn->rx_len -= skb->len; |
3938 | |
3939 | if (!conn->rx_len) { |
3940 | /* Complete frame received */ |
3941 | l2cap_recv_frame(conn, conn->rx_skb); |
3942 | conn->rx_skb = NULL; |
3943 | } |
3944 | } |
3945 | |
3946 | drop: |
3947 | kfree_skb(skb); |
3948 | return 0; |
3949 | } |
3950 | |
3951 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
3952 | { |
3953 | struct sock *sk; |
3954 | struct hlist_node *node; |
3955 | |
3956 | read_lock_bh(&l2cap_sk_list.lock); |
3957 | |
3958 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
3959 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3960 | |
3961 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
3962 | batostr(&bt_sk(sk)->src), |
3963 | batostr(&bt_sk(sk)->dst), |
3964 | sk->sk_state, __le16_to_cpu(pi->psm), |
3965 | pi->scid, pi->dcid, |
3966 | pi->imtu, pi->omtu, pi->sec_level); |
3967 | } |
3968 | |
3969 | read_unlock_bh(&l2cap_sk_list.lock); |
3970 | |
3971 | return 0; |
3972 | } |
3973 | |
3974 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
3975 | { |
3976 | return single_open(file, l2cap_debugfs_show, inode->i_private); |
3977 | } |
3978 | |
3979 | static const struct file_operations l2cap_debugfs_fops = { |
3980 | .open = l2cap_debugfs_open, |
3981 | .read = seq_read, |
3982 | .llseek = seq_lseek, |
3983 | .release = single_release, |
3984 | }; |
3985 | |
3986 | static struct dentry *l2cap_debugfs; |
3987 | |
3988 | static const struct proto_ops l2cap_sock_ops = { |
3989 | .family = PF_BLUETOOTH, |
3990 | .owner = THIS_MODULE, |
3991 | .release = l2cap_sock_release, |
3992 | .bind = l2cap_sock_bind, |
3993 | .connect = l2cap_sock_connect, |
3994 | .listen = l2cap_sock_listen, |
3995 | .accept = l2cap_sock_accept, |
3996 | .getname = l2cap_sock_getname, |
3997 | .sendmsg = l2cap_sock_sendmsg, |
3998 | .recvmsg = l2cap_sock_recvmsg, |
3999 | .poll = bt_sock_poll, |
4000 | .ioctl = bt_sock_ioctl, |
4001 | .mmap = sock_no_mmap, |
4002 | .socketpair = sock_no_socketpair, |
4003 | .shutdown = l2cap_sock_shutdown, |
4004 | .setsockopt = l2cap_sock_setsockopt, |
4005 | .getsockopt = l2cap_sock_getsockopt |
4006 | }; |
4007 | |
4008 | static const struct net_proto_family l2cap_sock_family_ops = { |
4009 | .family = PF_BLUETOOTH, |
4010 | .owner = THIS_MODULE, |
4011 | .create = l2cap_sock_create, |
4012 | }; |
4013 | |
4014 | static struct hci_proto l2cap_hci_proto = { |
4015 | .name = "L2CAP", |
4016 | .id = HCI_PROTO_L2CAP, |
4017 | .connect_ind = l2cap_connect_ind, |
4018 | .connect_cfm = l2cap_connect_cfm, |
4019 | .disconn_ind = l2cap_disconn_ind, |
4020 | .disconn_cfm = l2cap_disconn_cfm, |
4021 | .security_cfm = l2cap_security_cfm, |
4022 | .recv_acldata = l2cap_recv_acldata |
4023 | }; |
4024 | |
4025 | static int __init l2cap_init(void) |
4026 | { |
4027 | int err; |
4028 | |
4029 | err = proto_register(&l2cap_proto, 0); |
4030 | if (err < 0) |
4031 | return err; |
4032 | |
4033 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); |
4034 | if (err < 0) { |
4035 | BT_ERR("L2CAP socket registration failed"); |
4036 | goto error; |
4037 | } |
4038 | |
4039 | err = hci_register_proto(&l2cap_hci_proto); |
4040 | if (err < 0) { |
4041 | BT_ERR("L2CAP protocol registration failed"); |
4042 | bt_sock_unregister(BTPROTO_L2CAP); |
4043 | goto error; |
4044 | } |
4045 | |
4046 | if (bt_debugfs) { |
4047 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, |
4048 | bt_debugfs, NULL, &l2cap_debugfs_fops); |
4049 | if (!l2cap_debugfs) |
4050 | BT_ERR("Failed to create L2CAP debug file"); |
4051 | } |
4052 | |
4053 | BT_INFO("L2CAP ver %s", VERSION); |
4054 | BT_INFO("L2CAP socket layer initialized"); |
4055 | |
4056 | return 0; |
4057 | |
4058 | error: |
4059 | proto_unregister(&l2cap_proto); |
4060 | return err; |
4061 | } |
4062 | |
4063 | static void __exit l2cap_exit(void) |
4064 | { |
4065 | debugfs_remove(l2cap_debugfs); |
4066 | |
4067 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) |
4068 | BT_ERR("L2CAP socket unregistration failed"); |
4069 | |
4070 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4071 | BT_ERR("L2CAP protocol unregistration failed"); |
4072 | |
4073 | proto_unregister(&l2cap_proto); |
4074 | } |
4075 | |
4076 | void l2cap_load(void) |
4077 | { |
4078 | /* Dummy function to trigger automatic L2CAP module loading by |
4079 | * other modules that use L2CAP sockets but don't use any other |
4080 | * symbols from it. */ |
4081 | return; |
4082 | } |
4083 | EXPORT_SYMBOL(l2cap_load); |
4084 | |
4085 | module_init(l2cap_init); |
4086 | module_exit(l2cap_exit); |
4087 | |
4088 | module_param(enable_ertm, bool, 0644); |
4089 | MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); |
4090 | |
4091 | module_param(max_transmit, uint, 0644); |
4092 | MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)"); |
4093 | |
4094 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4095 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4096 | MODULE_VERSION(VERSION); |
4097 | MODULE_LICENSE("GPL"); |
4098 | MODULE_ALIAS("bt-proto-0"); |
4099 |
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v2.6.34-rc5
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