Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
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 | |
8e87d142 YH |
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 | |
1da177e4 LT |
18 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
19 | ||
8e87d142 YH |
20 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
21 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
22 | SOFTWARE IS DISCLAIMED. |
23 | */ | |
24 | ||
25 | /* Bluetooth L2CAP core and sockets. */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | ||
29 | #include <linux/types.h> | |
4fc268d2 | 30 | #include <linux/capability.h> |
1da177e4 LT |
31 | #include <linux/errno.h> |
32 | #include <linux/kernel.h> | |
1da177e4 LT |
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> | |
1da177e4 | 41 | #include <linux/list.h> |
be9d1227 | 42 | #include <linux/device.h> |
1da177e4 LT |
43 | #include <net/sock.h> |
44 | ||
45 | #include <asm/system.h> | |
46 | #include <asm/uaccess.h> | |
47 | #include <asm/unaligned.h> | |
48 | ||
49 | #include <net/bluetooth/bluetooth.h> | |
50 | #include <net/bluetooth/hci_core.h> | |
51 | #include <net/bluetooth/l2cap.h> | |
52 | ||
53 | #ifndef CONFIG_BT_L2CAP_DEBUG | |
54 | #undef BT_DBG | |
55 | #define BT_DBG(D...) | |
56 | #endif | |
57 | ||
09ab6f4c | 58 | #define VERSION "2.11" |
f0709e03 MH |
59 | |
60 | static u32 l2cap_feat_mask = 0x0000; | |
1da177e4 | 61 | |
90ddc4f0 | 62 | static const struct proto_ops l2cap_sock_ops; |
1da177e4 LT |
63 | |
64 | static struct bt_sock_list l2cap_sk_list = { | |
d5fb2962 | 65 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
66 | }; |
67 | ||
1da177e4 LT |
68 | static void __l2cap_sock_close(struct sock *sk, int reason); |
69 | static void l2cap_sock_close(struct sock *sk); | |
70 | static void l2cap_sock_kill(struct sock *sk); | |
71 | ||
72 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
73 | u8 code, u8 ident, u16 dlen, void *data); | |
74 | ||
75 | /* ---- L2CAP timers ---- */ | |
76 | static void l2cap_sock_timeout(unsigned long arg) | |
77 | { | |
78 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 79 | int reason; |
1da177e4 LT |
80 | |
81 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
82 | ||
83 | bh_lock_sock(sk); | |
b1235d79 MH |
84 | |
85 | if (sk->sk_state == BT_CONNECT && | |
86 | (l2cap_pi(sk)->link_mode & (L2CAP_LM_AUTH | | |
87 | L2CAP_LM_ENCRYPT | L2CAP_LM_SECURE))) | |
88 | reason = ECONNREFUSED; | |
89 | else | |
90 | reason = ETIMEDOUT; | |
91 | ||
92 | __l2cap_sock_close(sk, reason); | |
93 | ||
1da177e4 LT |
94 | bh_unlock_sock(sk); |
95 | ||
96 | l2cap_sock_kill(sk); | |
97 | sock_put(sk); | |
98 | } | |
99 | ||
100 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
101 | { | |
102 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
103 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
104 | } | |
105 | ||
106 | static void l2cap_sock_clear_timer(struct sock *sk) | |
107 | { | |
108 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
109 | sk_stop_timer(sk, &sk->sk_timer); | |
110 | } | |
111 | ||
0139418c MH |
112 | /* ---- L2CAP channels ---- */ |
113 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
114 | { | |
115 | struct sock *s; | |
116 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
117 | if (l2cap_pi(s)->dcid == cid) | |
118 | break; | |
119 | } | |
120 | return s; | |
121 | } | |
122 | ||
123 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
124 | { | |
125 | struct sock *s; | |
126 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
127 | if (l2cap_pi(s)->scid == cid) | |
128 | break; | |
129 | } | |
130 | return s; | |
131 | } | |
132 | ||
133 | /* Find channel with given SCID. | |
134 | * Returns locked socket */ | |
135 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
136 | { | |
137 | struct sock *s; | |
138 | read_lock(&l->lock); | |
139 | s = __l2cap_get_chan_by_scid(l, cid); | |
140 | if (s) bh_lock_sock(s); | |
141 | read_unlock(&l->lock); | |
142 | return s; | |
143 | } | |
144 | ||
145 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
146 | { | |
147 | struct sock *s; | |
148 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
149 | if (l2cap_pi(s)->ident == ident) | |
150 | break; | |
151 | } | |
152 | return s; | |
153 | } | |
154 | ||
155 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
156 | { | |
157 | struct sock *s; | |
158 | read_lock(&l->lock); | |
159 | s = __l2cap_get_chan_by_ident(l, ident); | |
160 | if (s) bh_lock_sock(s); | |
161 | read_unlock(&l->lock); | |
162 | return s; | |
163 | } | |
164 | ||
165 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
166 | { | |
167 | u16 cid = 0x0040; | |
168 | ||
169 | for (; cid < 0xffff; cid++) { | |
170 | if(!__l2cap_get_chan_by_scid(l, cid)) | |
171 | return cid; | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
178 | { | |
179 | sock_hold(sk); | |
180 | ||
181 | if (l->head) | |
182 | l2cap_pi(l->head)->prev_c = sk; | |
183 | ||
184 | l2cap_pi(sk)->next_c = l->head; | |
185 | l2cap_pi(sk)->prev_c = NULL; | |
186 | l->head = sk; | |
187 | } | |
188 | ||
189 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
190 | { | |
191 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
192 | ||
fd1278d7 | 193 | write_lock_bh(&l->lock); |
0139418c MH |
194 | if (sk == l->head) |
195 | l->head = next; | |
196 | ||
197 | if (next) | |
198 | l2cap_pi(next)->prev_c = prev; | |
199 | if (prev) | |
200 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 201 | write_unlock_bh(&l->lock); |
0139418c MH |
202 | |
203 | __sock_put(sk); | |
204 | } | |
205 | ||
206 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
207 | { | |
208 | struct l2cap_chan_list *l = &conn->chan_list; | |
209 | ||
210 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
211 | ||
212 | l2cap_pi(sk)->conn = conn; | |
213 | ||
214 | if (sk->sk_type == SOCK_SEQPACKET) { | |
215 | /* Alloc CID for connection-oriented socket */ | |
216 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
217 | } else if (sk->sk_type == SOCK_DGRAM) { | |
218 | /* Connectionless socket */ | |
219 | l2cap_pi(sk)->scid = 0x0002; | |
220 | l2cap_pi(sk)->dcid = 0x0002; | |
221 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; | |
222 | } else { | |
223 | /* Raw socket can send/recv signalling messages only */ | |
224 | l2cap_pi(sk)->scid = 0x0001; | |
225 | l2cap_pi(sk)->dcid = 0x0001; | |
226 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; | |
227 | } | |
228 | ||
229 | __l2cap_chan_link(l, sk); | |
230 | ||
231 | if (parent) | |
232 | bt_accept_enqueue(parent, sk); | |
233 | } | |
234 | ||
8e87d142 | 235 | /* Delete channel. |
0139418c MH |
236 | * Must be called on the locked socket. */ |
237 | static void l2cap_chan_del(struct sock *sk, int err) | |
238 | { | |
239 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
240 | struct sock *parent = bt_sk(sk)->parent; | |
241 | ||
242 | l2cap_sock_clear_timer(sk); | |
243 | ||
244 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
245 | ||
8e87d142 | 246 | if (conn) { |
0139418c MH |
247 | /* Unlink from channel list */ |
248 | l2cap_chan_unlink(&conn->chan_list, sk); | |
249 | l2cap_pi(sk)->conn = NULL; | |
250 | hci_conn_put(conn->hcon); | |
251 | } | |
252 | ||
b1235d79 | 253 | sk->sk_state = BT_CLOSED; |
0139418c MH |
254 | sock_set_flag(sk, SOCK_ZAPPED); |
255 | ||
256 | if (err) | |
257 | sk->sk_err = err; | |
258 | ||
259 | if (parent) { | |
260 | bt_accept_unlink(sk); | |
261 | parent->sk_data_ready(parent, 0); | |
262 | } else | |
263 | sk->sk_state_change(sk); | |
264 | } | |
265 | ||
79d554a6 MH |
266 | /* Service level security */ |
267 | static inline int l2cap_check_link_mode(struct sock *sk) | |
268 | { | |
269 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
270 | ||
271 | if ((l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) || | |
272 | (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) | |
273 | return hci_conn_encrypt(conn->hcon); | |
274 | ||
275 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH) | |
276 | return hci_conn_auth(conn->hcon); | |
277 | ||
278 | return 1; | |
279 | } | |
280 | ||
4e8402a3 MH |
281 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
282 | { | |
283 | u8 id; | |
284 | ||
285 | /* Get next available identificator. | |
286 | * 1 - 128 are used by kernel. | |
287 | * 129 - 199 are reserved. | |
288 | * 200 - 254 are used by utilities like l2ping, etc. | |
289 | */ | |
290 | ||
291 | spin_lock_bh(&conn->lock); | |
292 | ||
293 | if (++conn->tx_ident > 128) | |
294 | conn->tx_ident = 1; | |
295 | ||
296 | id = conn->tx_ident; | |
297 | ||
298 | spin_unlock_bh(&conn->lock); | |
299 | ||
300 | return id; | |
301 | } | |
302 | ||
303 | static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) | |
304 | { | |
305 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
306 | ||
307 | BT_DBG("code 0x%2.2x", code); | |
308 | ||
309 | if (!skb) | |
310 | return -ENOMEM; | |
311 | ||
312 | return hci_send_acl(conn->hcon, skb, 0); | |
313 | } | |
314 | ||
79d554a6 MH |
315 | static void l2cap_do_start(struct sock *sk) |
316 | { | |
317 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
318 | ||
319 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
b1235d79 MH |
320 | if (l2cap_check_link_mode(sk)) { |
321 | struct l2cap_conn_req req; | |
322 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
323 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 324 | |
b1235d79 | 325 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 326 | |
b1235d79 | 327 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 328 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 329 | } |
79d554a6 MH |
330 | } else { |
331 | struct l2cap_info_req req; | |
332 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
333 | ||
334 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
335 | conn->info_ident = l2cap_get_ident(conn); | |
336 | ||
337 | mod_timer(&conn->info_timer, jiffies + | |
338 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
339 | ||
340 | l2cap_send_cmd(conn, conn->info_ident, | |
341 | L2CAP_INFO_REQ, sizeof(req), &req); | |
342 | } | |
343 | } | |
344 | ||
1da177e4 | 345 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
346 | static void l2cap_conn_start(struct l2cap_conn *conn) |
347 | { | |
348 | struct l2cap_chan_list *l = &conn->chan_list; | |
349 | struct sock *sk; | |
350 | ||
351 | BT_DBG("conn %p", conn); | |
352 | ||
353 | read_lock(&l->lock); | |
354 | ||
355 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
356 | bh_lock_sock(sk); | |
357 | ||
358 | if (sk->sk_type != SOCK_SEQPACKET) { | |
79d554a6 MH |
359 | bh_unlock_sock(sk); |
360 | continue; | |
361 | } | |
362 | ||
363 | if (sk->sk_state == BT_CONNECT) { | |
b1235d79 MH |
364 | if (l2cap_check_link_mode(sk)) { |
365 | struct l2cap_conn_req req; | |
366 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
367 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 368 | |
b1235d79 | 369 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 370 | |
b1235d79 | 371 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 372 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 373 | } |
79d554a6 MH |
374 | } else if (sk->sk_state == BT_CONNECT2) { |
375 | struct l2cap_conn_rsp rsp; | |
376 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
377 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
378 | ||
379 | if (l2cap_check_link_mode(sk)) { | |
380 | sk->sk_state = BT_CONFIG; | |
381 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
382 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
383 | } else { | |
384 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
385 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
386 | } | |
387 | ||
388 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
389 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
390 | } |
391 | ||
392 | bh_unlock_sock(sk); | |
393 | } | |
394 | ||
395 | read_unlock(&l->lock); | |
396 | } | |
397 | ||
398 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
399 | { | |
79d554a6 MH |
400 | struct l2cap_chan_list *l = &conn->chan_list; |
401 | struct sock *sk; | |
4e8402a3 | 402 | |
79d554a6 | 403 | BT_DBG("conn %p", conn); |
4e8402a3 | 404 | |
79d554a6 | 405 | read_lock(&l->lock); |
4e8402a3 | 406 | |
79d554a6 MH |
407 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
408 | bh_lock_sock(sk); | |
4e8402a3 | 409 | |
79d554a6 MH |
410 | if (sk->sk_type != SOCK_SEQPACKET) { |
411 | l2cap_sock_clear_timer(sk); | |
412 | sk->sk_state = BT_CONNECTED; | |
413 | sk->sk_state_change(sk); | |
414 | } else if (sk->sk_state == BT_CONNECT) | |
415 | l2cap_do_start(sk); | |
4e8402a3 | 416 | |
79d554a6 | 417 | bh_unlock_sock(sk); |
4e8402a3 | 418 | } |
79d554a6 MH |
419 | |
420 | read_unlock(&l->lock); | |
4e8402a3 MH |
421 | } |
422 | ||
423 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
424 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
425 | { | |
426 | struct l2cap_chan_list *l = &conn->chan_list; | |
427 | struct sock *sk; | |
428 | ||
429 | BT_DBG("conn %p", conn); | |
430 | ||
431 | read_lock(&l->lock); | |
432 | ||
433 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
434 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_RELIABLE) | |
435 | sk->sk_err = err; | |
436 | } | |
437 | ||
438 | read_unlock(&l->lock); | |
439 | } | |
440 | ||
441 | static void l2cap_info_timeout(unsigned long arg) | |
442 | { | |
443 | struct l2cap_conn *conn = (void *) arg; | |
444 | ||
445 | conn->info_ident = 0; | |
446 | ||
447 | l2cap_conn_start(conn); | |
448 | } | |
449 | ||
1da177e4 LT |
450 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
451 | { | |
0139418c | 452 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 453 | |
0139418c | 454 | if (conn || status) |
1da177e4 LT |
455 | return conn; |
456 | ||
0139418c MH |
457 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
458 | if (!conn) | |
1da177e4 | 459 | return NULL; |
1da177e4 LT |
460 | |
461 | hcon->l2cap_data = conn; | |
462 | conn->hcon = hcon; | |
463 | ||
0139418c MH |
464 | BT_DBG("hcon %p conn %p", hcon, conn); |
465 | ||
1da177e4 LT |
466 | conn->mtu = hcon->hdev->acl_mtu; |
467 | conn->src = &hcon->hdev->bdaddr; | |
468 | conn->dst = &hcon->dst; | |
469 | ||
4e8402a3 MH |
470 | conn->feat_mask = 0; |
471 | ||
b1235d79 MH |
472 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
473 | (unsigned long) conn); | |
4e8402a3 | 474 | |
1da177e4 LT |
475 | spin_lock_init(&conn->lock); |
476 | rwlock_init(&conn->chan_list.lock); | |
477 | ||
1da177e4 LT |
478 | return conn; |
479 | } | |
480 | ||
0139418c | 481 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 482 | { |
0139418c | 483 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
484 | struct sock *sk; |
485 | ||
0139418c MH |
486 | if (!conn) |
487 | return; | |
1da177e4 LT |
488 | |
489 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
490 | ||
491 | if (conn->rx_skb) | |
492 | kfree_skb(conn->rx_skb); | |
493 | ||
494 | /* Kill channels */ | |
495 | while ((sk = conn->chan_list.head)) { | |
496 | bh_lock_sock(sk); | |
497 | l2cap_chan_del(sk, err); | |
498 | bh_unlock_sock(sk); | |
499 | l2cap_sock_kill(sk); | |
500 | } | |
501 | ||
8e8440f5 DY |
502 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
503 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 504 | |
1da177e4 LT |
505 | hcon->l2cap_data = NULL; |
506 | kfree(conn); | |
1da177e4 LT |
507 | } |
508 | ||
509 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
510 | { | |
511 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 512 | write_lock_bh(&l->lock); |
1da177e4 | 513 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 514 | write_unlock_bh(&l->lock); |
1da177e4 LT |
515 | } |
516 | ||
1da177e4 | 517 | /* ---- Socket interface ---- */ |
8e036fc3 | 518 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
519 | { |
520 | struct sock *sk; | |
521 | struct hlist_node *node; | |
522 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
523 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
524 | goto found; | |
525 | sk = NULL; | |
526 | found: | |
527 | return sk; | |
528 | } | |
529 | ||
530 | /* Find socket with psm and source bdaddr. | |
531 | * Returns closest match. | |
532 | */ | |
8e036fc3 | 533 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
534 | { |
535 | struct sock *sk = NULL, *sk1 = NULL; | |
536 | struct hlist_node *node; | |
537 | ||
538 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
539 | if (state && sk->sk_state != state) | |
540 | continue; | |
541 | ||
542 | if (l2cap_pi(sk)->psm == psm) { | |
543 | /* Exact match. */ | |
544 | if (!bacmp(&bt_sk(sk)->src, src)) | |
545 | break; | |
546 | ||
547 | /* Closest match */ | |
548 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
549 | sk1 = sk; | |
550 | } | |
551 | } | |
552 | return node ? sk : sk1; | |
553 | } | |
554 | ||
555 | /* Find socket with given address (psm, src). | |
556 | * Returns locked socket */ | |
8e036fc3 | 557 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
558 | { |
559 | struct sock *s; | |
560 | read_lock(&l2cap_sk_list.lock); | |
561 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
562 | if (s) bh_lock_sock(s); | |
563 | read_unlock(&l2cap_sk_list.lock); | |
564 | return s; | |
565 | } | |
566 | ||
567 | static void l2cap_sock_destruct(struct sock *sk) | |
568 | { | |
569 | BT_DBG("sk %p", sk); | |
570 | ||
571 | skb_queue_purge(&sk->sk_receive_queue); | |
572 | skb_queue_purge(&sk->sk_write_queue); | |
573 | } | |
574 | ||
575 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
576 | { | |
577 | struct sock *sk; | |
578 | ||
579 | BT_DBG("parent %p", parent); | |
580 | ||
581 | /* Close not yet accepted channels */ | |
582 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
583 | l2cap_sock_close(sk); | |
584 | ||
b1235d79 | 585 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
586 | sock_set_flag(parent, SOCK_ZAPPED); |
587 | } | |
588 | ||
589 | /* Kill socket (only if zapped and orphan) | |
590 | * Must be called on unlocked socket. | |
591 | */ | |
592 | static void l2cap_sock_kill(struct sock *sk) | |
593 | { | |
594 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
595 | return; | |
596 | ||
597 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
598 | ||
599 | /* Kill poor orphan */ | |
600 | bt_sock_unlink(&l2cap_sk_list, sk); | |
601 | sock_set_flag(sk, SOCK_DEAD); | |
602 | sock_put(sk); | |
603 | } | |
604 | ||
605 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
606 | { | |
607 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
608 | ||
609 | switch (sk->sk_state) { | |
610 | case BT_LISTEN: | |
611 | l2cap_sock_cleanup_listen(sk); | |
612 | break; | |
613 | ||
614 | case BT_CONNECTED: | |
615 | case BT_CONFIG: | |
616 | case BT_CONNECT2: | |
617 | if (sk->sk_type == SOCK_SEQPACKET) { | |
618 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
619 | struct l2cap_disconn_req req; | |
620 | ||
621 | sk->sk_state = BT_DISCONN; | |
622 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
623 | ||
aca3192c YH |
624 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
625 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1da177e4 LT |
626 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
627 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
b1235d79 | 628 | } else |
1da177e4 | 629 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
630 | break; |
631 | ||
632 | case BT_CONNECT: | |
633 | case BT_DISCONN: | |
634 | l2cap_chan_del(sk, reason); | |
635 | break; | |
636 | ||
637 | default: | |
638 | sock_set_flag(sk, SOCK_ZAPPED); | |
639 | break; | |
640 | } | |
641 | } | |
642 | ||
643 | /* Must be called on unlocked socket. */ | |
644 | static void l2cap_sock_close(struct sock *sk) | |
645 | { | |
646 | l2cap_sock_clear_timer(sk); | |
647 | lock_sock(sk); | |
648 | __l2cap_sock_close(sk, ECONNRESET); | |
649 | release_sock(sk); | |
650 | l2cap_sock_kill(sk); | |
651 | } | |
652 | ||
653 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
654 | { | |
655 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
656 | ||
657 | BT_DBG("sk %p", sk); | |
658 | ||
659 | if (parent) { | |
660 | sk->sk_type = parent->sk_type; | |
661 | pi->imtu = l2cap_pi(parent)->imtu; | |
662 | pi->omtu = l2cap_pi(parent)->omtu; | |
663 | pi->link_mode = l2cap_pi(parent)->link_mode; | |
664 | } else { | |
665 | pi->imtu = L2CAP_DEFAULT_MTU; | |
666 | pi->omtu = 0; | |
667 | pi->link_mode = 0; | |
668 | } | |
669 | ||
670 | /* Default config options */ | |
5dee9e7c | 671 | pi->conf_len = 0; |
1da177e4 LT |
672 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
673 | } | |
674 | ||
675 | static struct proto l2cap_proto = { | |
676 | .name = "L2CAP", | |
677 | .owner = THIS_MODULE, | |
678 | .obj_size = sizeof(struct l2cap_pinfo) | |
679 | }; | |
680 | ||
1b8d7ae4 | 681 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
682 | { |
683 | struct sock *sk; | |
684 | ||
6257ff21 | 685 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
686 | if (!sk) |
687 | return NULL; | |
688 | ||
689 | sock_init_data(sock, sk); | |
690 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
691 | ||
692 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 693 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
694 | |
695 | sock_reset_flag(sk, SOCK_ZAPPED); | |
696 | ||
697 | sk->sk_protocol = proto; | |
b1235d79 | 698 | sk->sk_state = BT_OPEN; |
1da177e4 | 699 | |
b1235d79 | 700 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
701 | |
702 | bt_sock_link(&l2cap_sk_list, sk); | |
703 | return sk; | |
704 | } | |
705 | ||
1b8d7ae4 | 706 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
707 | { |
708 | struct sock *sk; | |
709 | ||
710 | BT_DBG("sock %p", sock); | |
711 | ||
712 | sock->state = SS_UNCONNECTED; | |
713 | ||
714 | if (sock->type != SOCK_SEQPACKET && | |
715 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) | |
716 | return -ESOCKTNOSUPPORT; | |
717 | ||
718 | if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW)) | |
719 | return -EPERM; | |
720 | ||
721 | sock->ops = &l2cap_sock_ops; | |
722 | ||
1b8d7ae4 | 723 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
724 | if (!sk) |
725 | return -ENOMEM; | |
726 | ||
727 | l2cap_sock_init(sk, NULL); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
732 | { | |
733 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
734 | struct sock *sk = sock->sk; | |
735 | int err = 0; | |
736 | ||
737 | BT_DBG("sk %p, %s %d", sk, batostr(&la->l2_bdaddr), la->l2_psm); | |
738 | ||
739 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
740 | return -EINVAL; | |
741 | ||
742 | lock_sock(sk); | |
743 | ||
744 | if (sk->sk_state != BT_OPEN) { | |
745 | err = -EBADFD; | |
746 | goto done; | |
747 | } | |
748 | ||
8e036fc3 | 749 | if (la->l2_psm && btohs(la->l2_psm) < 0x1001 && |
847641d7 MH |
750 | !capable(CAP_NET_BIND_SERVICE)) { |
751 | err = -EACCES; | |
752 | goto done; | |
753 | } | |
8e87d142 | 754 | |
1da177e4 LT |
755 | write_lock_bh(&l2cap_sk_list.lock); |
756 | ||
757 | if (la->l2_psm && __l2cap_get_sock_by_addr(la->l2_psm, &la->l2_bdaddr)) { | |
758 | err = -EADDRINUSE; | |
759 | } else { | |
760 | /* Save source address */ | |
761 | bacpy(&bt_sk(sk)->src, &la->l2_bdaddr); | |
762 | l2cap_pi(sk)->psm = la->l2_psm; | |
763 | l2cap_pi(sk)->sport = la->l2_psm; | |
764 | sk->sk_state = BT_BOUND; | |
765 | } | |
766 | ||
767 | write_unlock_bh(&l2cap_sk_list.lock); | |
768 | ||
769 | done: | |
770 | release_sock(sk); | |
771 | return err; | |
772 | } | |
773 | ||
774 | static int l2cap_do_connect(struct sock *sk) | |
775 | { | |
776 | bdaddr_t *src = &bt_sk(sk)->src; | |
777 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
778 | struct l2cap_conn *conn; | |
779 | struct hci_conn *hcon; | |
780 | struct hci_dev *hdev; | |
09ab6f4c | 781 | __u8 auth_type; |
1da177e4 LT |
782 | int err = 0; |
783 | ||
784 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), l2cap_pi(sk)->psm); | |
785 | ||
786 | if (!(hdev = hci_get_route(dst, src))) | |
787 | return -EHOSTUNREACH; | |
788 | ||
789 | hci_dev_lock_bh(hdev); | |
790 | ||
791 | err = -ENOMEM; | |
792 | ||
09ab6f4c MH |
793 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH || |
794 | l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT || | |
795 | l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE) { | |
796 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) | |
797 | auth_type = HCI_AT_NO_BONDING_MITM; | |
798 | else | |
799 | auth_type = HCI_AT_GENERAL_BONDING_MITM; | |
800 | } else { | |
801 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) | |
802 | auth_type = HCI_AT_NO_BONDING; | |
803 | else | |
804 | auth_type = HCI_AT_GENERAL_BONDING; | |
805 | } | |
806 | ||
807 | hcon = hci_connect(hdev, ACL_LINK, dst, auth_type); | |
1da177e4 LT |
808 | if (!hcon) |
809 | goto done; | |
810 | ||
811 | conn = l2cap_conn_add(hcon, 0); | |
812 | if (!conn) { | |
813 | hci_conn_put(hcon); | |
814 | goto done; | |
815 | } | |
816 | ||
817 | err = 0; | |
818 | ||
819 | /* Update source addr of the socket */ | |
820 | bacpy(src, conn->src); | |
821 | ||
822 | l2cap_chan_add(conn, sk, NULL); | |
823 | ||
824 | sk->sk_state = BT_CONNECT; | |
825 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
826 | ||
827 | if (hcon->state == BT_CONNECTED) { | |
79d554a6 | 828 | if (sk->sk_type != SOCK_SEQPACKET) { |
1da177e4 LT |
829 | l2cap_sock_clear_timer(sk); |
830 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
831 | } else |
832 | l2cap_do_start(sk); | |
1da177e4 LT |
833 | } |
834 | ||
835 | done: | |
836 | hci_dev_unlock_bh(hdev); | |
837 | hci_dev_put(hdev); | |
838 | return err; | |
839 | } | |
840 | ||
841 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
842 | { | |
843 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
844 | struct sock *sk = sock->sk; | |
845 | int err = 0; | |
846 | ||
847 | lock_sock(sk); | |
848 | ||
849 | BT_DBG("sk %p", sk); | |
850 | ||
851 | if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_l2)) { | |
852 | err = -EINVAL; | |
853 | goto done; | |
854 | } | |
855 | ||
856 | if (sk->sk_type == SOCK_SEQPACKET && !la->l2_psm) { | |
857 | err = -EINVAL; | |
858 | goto done; | |
859 | } | |
860 | ||
861 | switch(sk->sk_state) { | |
862 | case BT_CONNECT: | |
863 | case BT_CONNECT2: | |
864 | case BT_CONFIG: | |
865 | /* Already connecting */ | |
866 | goto wait; | |
867 | ||
868 | case BT_CONNECTED: | |
869 | /* Already connected */ | |
870 | goto done; | |
871 | ||
872 | case BT_OPEN: | |
873 | case BT_BOUND: | |
874 | /* Can connect */ | |
875 | break; | |
876 | ||
877 | default: | |
878 | err = -EBADFD; | |
879 | goto done; | |
880 | } | |
881 | ||
882 | /* Set destination address and psm */ | |
883 | bacpy(&bt_sk(sk)->dst, &la->l2_bdaddr); | |
884 | l2cap_pi(sk)->psm = la->l2_psm; | |
885 | ||
886 | if ((err = l2cap_do_connect(sk))) | |
887 | goto done; | |
888 | ||
889 | wait: | |
890 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
891 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
892 | done: | |
893 | release_sock(sk); | |
894 | return err; | |
895 | } | |
896 | ||
897 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
898 | { | |
899 | struct sock *sk = sock->sk; | |
900 | int err = 0; | |
901 | ||
902 | BT_DBG("sk %p backlog %d", sk, backlog); | |
903 | ||
904 | lock_sock(sk); | |
905 | ||
906 | if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) { | |
907 | err = -EBADFD; | |
908 | goto done; | |
909 | } | |
910 | ||
911 | if (!l2cap_pi(sk)->psm) { | |
912 | bdaddr_t *src = &bt_sk(sk)->src; | |
913 | u16 psm; | |
914 | ||
915 | err = -EINVAL; | |
916 | ||
917 | write_lock_bh(&l2cap_sk_list.lock); | |
918 | ||
919 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
6dc0c208 | 920 | if (!__l2cap_get_sock_by_addr(htobs(psm), src)) { |
1da177e4 LT |
921 | l2cap_pi(sk)->psm = htobs(psm); |
922 | l2cap_pi(sk)->sport = htobs(psm); | |
923 | err = 0; | |
924 | break; | |
925 | } | |
926 | ||
927 | write_unlock_bh(&l2cap_sk_list.lock); | |
928 | ||
929 | if (err < 0) | |
930 | goto done; | |
931 | } | |
932 | ||
933 | sk->sk_max_ack_backlog = backlog; | |
934 | sk->sk_ack_backlog = 0; | |
935 | sk->sk_state = BT_LISTEN; | |
936 | ||
937 | done: | |
938 | release_sock(sk); | |
939 | return err; | |
940 | } | |
941 | ||
942 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
943 | { | |
944 | DECLARE_WAITQUEUE(wait, current); | |
945 | struct sock *sk = sock->sk, *nsk; | |
946 | long timeo; | |
947 | int err = 0; | |
948 | ||
fcc70d5f | 949 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
950 | |
951 | if (sk->sk_state != BT_LISTEN) { | |
952 | err = -EBADFD; | |
953 | goto done; | |
954 | } | |
955 | ||
956 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
957 | ||
958 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
959 | ||
960 | /* Wait for an incoming connection. (wake-one). */ | |
961 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
962 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { | |
963 | set_current_state(TASK_INTERRUPTIBLE); | |
964 | if (!timeo) { | |
965 | err = -EAGAIN; | |
966 | break; | |
967 | } | |
968 | ||
969 | release_sock(sk); | |
970 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 971 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
972 | |
973 | if (sk->sk_state != BT_LISTEN) { | |
974 | err = -EBADFD; | |
975 | break; | |
976 | } | |
977 | ||
978 | if (signal_pending(current)) { | |
979 | err = sock_intr_errno(timeo); | |
980 | break; | |
981 | } | |
982 | } | |
983 | set_current_state(TASK_RUNNING); | |
984 | remove_wait_queue(sk->sk_sleep, &wait); | |
985 | ||
986 | if (err) | |
987 | goto done; | |
988 | ||
989 | newsock->state = SS_CONNECTED; | |
990 | ||
991 | BT_DBG("new socket %p", nsk); | |
992 | ||
993 | done: | |
994 | release_sock(sk); | |
995 | return err; | |
996 | } | |
997 | ||
998 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
999 | { | |
1000 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1001 | struct sock *sk = sock->sk; | |
1002 | ||
1003 | BT_DBG("sock %p, sk %p", sock, sk); | |
1004 | ||
1005 | addr->sa_family = AF_BLUETOOTH; | |
1006 | *len = sizeof(struct sockaddr_l2); | |
1007 | ||
1008 | if (peer) | |
1009 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); | |
1010 | else | |
1011 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); | |
1012 | ||
1013 | la->l2_psm = l2cap_pi(sk)->psm; | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static inline int l2cap_do_send(struct sock *sk, struct msghdr *msg, int len) | |
1018 | { | |
1019 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1020 | struct sk_buff *skb, **frag; | |
1021 | int err, hlen, count, sent=0; | |
1022 | struct l2cap_hdr *lh; | |
1023 | ||
1024 | BT_DBG("sk %p len %d", sk, len); | |
1025 | ||
1026 | /* First fragment (with L2CAP header) */ | |
1027 | if (sk->sk_type == SOCK_DGRAM) | |
1028 | hlen = L2CAP_HDR_SIZE + 2; | |
1029 | else | |
1030 | hlen = L2CAP_HDR_SIZE; | |
1031 | ||
1032 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1033 | ||
1034 | skb = bt_skb_send_alloc(sk, hlen + count, | |
1035 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1036 | if (!skb) | |
1037 | return err; | |
1038 | ||
1039 | /* Create L2CAP header */ | |
1040 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c YH |
1041 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1042 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1da177e4 LT |
1043 | |
1044 | if (sk->sk_type == SOCK_DGRAM) | |
8e036fc3 | 1045 | put_unaligned(l2cap_pi(sk)->psm, (__le16 *) skb_put(skb, 2)); |
1da177e4 LT |
1046 | |
1047 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) { | |
1048 | err = -EFAULT; | |
1049 | goto fail; | |
1050 | } | |
1051 | ||
1052 | sent += count; | |
1053 | len -= count; | |
1054 | ||
1055 | /* Continuation fragments (no L2CAP header) */ | |
1056 | frag = &skb_shinfo(skb)->frag_list; | |
1057 | while (len) { | |
1058 | count = min_t(unsigned int, conn->mtu, len); | |
1059 | ||
1060 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1061 | if (!*frag) | |
1062 | goto fail; | |
8e87d142 | 1063 | |
1da177e4 LT |
1064 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) { |
1065 | err = -EFAULT; | |
1066 | goto fail; | |
1067 | } | |
1068 | ||
1069 | sent += count; | |
1070 | len -= count; | |
1071 | ||
1072 | frag = &(*frag)->next; | |
1073 | } | |
1074 | ||
1075 | if ((err = hci_send_acl(conn->hcon, skb, 0)) < 0) | |
1076 | goto fail; | |
1077 | ||
1078 | return sent; | |
1079 | ||
1080 | fail: | |
1081 | kfree_skb(skb); | |
1082 | return err; | |
1083 | } | |
1084 | ||
1085 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) | |
1086 | { | |
1087 | struct sock *sk = sock->sk; | |
1088 | int err = 0; | |
1089 | ||
1090 | BT_DBG("sock %p, sk %p", sock, sk); | |
1091 | ||
c1cbe4b7 BL |
1092 | err = sock_error(sk); |
1093 | if (err) | |
1094 | return err; | |
1da177e4 LT |
1095 | |
1096 | if (msg->msg_flags & MSG_OOB) | |
1097 | return -EOPNOTSUPP; | |
1098 | ||
1099 | /* Check outgoing MTU */ | |
1100 | if (sk->sk_type != SOCK_RAW && len > l2cap_pi(sk)->omtu) | |
1101 | return -EINVAL; | |
1102 | ||
1103 | lock_sock(sk); | |
1104 | ||
1105 | if (sk->sk_state == BT_CONNECTED) | |
1106 | err = l2cap_do_send(sk, msg, len); | |
1107 | else | |
1108 | err = -ENOTCONN; | |
1109 | ||
1110 | release_sock(sk); | |
1111 | return err; | |
1112 | } | |
1113 | ||
1114 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
1115 | { | |
1116 | struct sock *sk = sock->sk; | |
1117 | struct l2cap_options opts; | |
1118 | int err = 0, len; | |
1119 | u32 opt; | |
1120 | ||
1121 | BT_DBG("sk %p", sk); | |
1122 | ||
1123 | lock_sock(sk); | |
1124 | ||
1125 | switch (optname) { | |
1126 | case L2CAP_OPTIONS: | |
0878b666 MH |
1127 | opts.imtu = l2cap_pi(sk)->imtu; |
1128 | opts.omtu = l2cap_pi(sk)->omtu; | |
1129 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
6464f35f | 1130 | opts.mode = L2CAP_MODE_BASIC; |
0878b666 | 1131 | |
1da177e4 LT |
1132 | len = min_t(unsigned int, sizeof(opts), optlen); |
1133 | if (copy_from_user((char *) &opts, optval, len)) { | |
1134 | err = -EFAULT; | |
1135 | break; | |
1136 | } | |
0878b666 | 1137 | |
1da177e4 LT |
1138 | l2cap_pi(sk)->imtu = opts.imtu; |
1139 | l2cap_pi(sk)->omtu = opts.omtu; | |
1140 | break; | |
1141 | ||
1142 | case L2CAP_LM: | |
1143 | if (get_user(opt, (u32 __user *) optval)) { | |
1144 | err = -EFAULT; | |
1145 | break; | |
1146 | } | |
1147 | ||
1148 | l2cap_pi(sk)->link_mode = opt; | |
1149 | break; | |
1150 | ||
1151 | default: | |
1152 | err = -ENOPROTOOPT; | |
1153 | break; | |
1154 | } | |
1155 | ||
1156 | release_sock(sk); | |
1157 | return err; | |
1158 | } | |
1159 | ||
1160 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) | |
1161 | { | |
1162 | struct sock *sk = sock->sk; | |
1163 | struct l2cap_options opts; | |
1164 | struct l2cap_conninfo cinfo; | |
1165 | int len, err = 0; | |
1166 | ||
1167 | BT_DBG("sk %p", sk); | |
1168 | ||
1169 | if (get_user(len, optlen)) | |
1170 | return -EFAULT; | |
1171 | ||
1172 | lock_sock(sk); | |
1173 | ||
1174 | switch (optname) { | |
1175 | case L2CAP_OPTIONS: | |
1176 | opts.imtu = l2cap_pi(sk)->imtu; | |
1177 | opts.omtu = l2cap_pi(sk)->omtu; | |
1178 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
6464f35f | 1179 | opts.mode = L2CAP_MODE_BASIC; |
1da177e4 LT |
1180 | |
1181 | len = min_t(unsigned int, len, sizeof(opts)); | |
1182 | if (copy_to_user(optval, (char *) &opts, len)) | |
1183 | err = -EFAULT; | |
1184 | ||
1185 | break; | |
1186 | ||
1187 | case L2CAP_LM: | |
1188 | if (put_user(l2cap_pi(sk)->link_mode, (u32 __user *) optval)) | |
1189 | err = -EFAULT; | |
1190 | break; | |
1191 | ||
1192 | case L2CAP_CONNINFO: | |
1193 | if (sk->sk_state != BT_CONNECTED) { | |
1194 | err = -ENOTCONN; | |
1195 | break; | |
1196 | } | |
1197 | ||
1198 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
1199 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
1200 | ||
1201 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
1202 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
1203 | err = -EFAULT; | |
1204 | ||
1205 | break; | |
1206 | ||
1207 | default: | |
1208 | err = -ENOPROTOOPT; | |
1209 | break; | |
1210 | } | |
1211 | ||
1212 | release_sock(sk); | |
1213 | return err; | |
1214 | } | |
1215 | ||
1216 | static int l2cap_sock_shutdown(struct socket *sock, int how) | |
1217 | { | |
1218 | struct sock *sk = sock->sk; | |
1219 | int err = 0; | |
1220 | ||
1221 | BT_DBG("sock %p, sk %p", sock, sk); | |
1222 | ||
1223 | if (!sk) | |
1224 | return 0; | |
1225 | ||
1226 | lock_sock(sk); | |
1227 | if (!sk->sk_shutdown) { | |
1228 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1229 | l2cap_sock_clear_timer(sk); | |
1230 | __l2cap_sock_close(sk, 0); | |
1231 | ||
1232 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
1233 | err = bt_sock_wait_state(sk, BT_CLOSED, |
1234 | sk->sk_lingertime); | |
1da177e4 LT |
1235 | } |
1236 | release_sock(sk); | |
1237 | return err; | |
1238 | } | |
1239 | ||
1240 | static int l2cap_sock_release(struct socket *sock) | |
1241 | { | |
1242 | struct sock *sk = sock->sk; | |
1243 | int err; | |
1244 | ||
1245 | BT_DBG("sock %p, sk %p", sock, sk); | |
1246 | ||
1247 | if (!sk) | |
1248 | return 0; | |
1249 | ||
1250 | err = l2cap_sock_shutdown(sock, 2); | |
1251 | ||
1252 | sock_orphan(sk); | |
1253 | l2cap_sock_kill(sk); | |
1254 | return err; | |
1255 | } | |
1256 | ||
1da177e4 LT |
1257 | static void l2cap_chan_ready(struct sock *sk) |
1258 | { | |
1259 | struct sock *parent = bt_sk(sk)->parent; | |
1260 | ||
1261 | BT_DBG("sk %p, parent %p", sk, parent); | |
1262 | ||
1263 | l2cap_pi(sk)->conf_state = 0; | |
1264 | l2cap_sock_clear_timer(sk); | |
1265 | ||
1266 | if (!parent) { | |
1267 | /* Outgoing channel. | |
1268 | * Wake up socket sleeping on connect. | |
1269 | */ | |
1270 | sk->sk_state = BT_CONNECTED; | |
1271 | sk->sk_state_change(sk); | |
1272 | } else { | |
1273 | /* Incoming channel. | |
1274 | * Wake up socket sleeping on accept. | |
1275 | */ | |
1276 | parent->sk_data_ready(parent, 0); | |
1277 | } | |
b1235d79 MH |
1278 | |
1279 | if (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE) { | |
1280 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1281 | hci_conn_change_link_key(conn->hcon); | |
1282 | } | |
1da177e4 LT |
1283 | } |
1284 | ||
1285 | /* Copy frame to all raw sockets on that connection */ | |
1286 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1287 | { | |
1288 | struct l2cap_chan_list *l = &conn->chan_list; | |
1289 | struct sk_buff *nskb; | |
1290 | struct sock * sk; | |
1291 | ||
1292 | BT_DBG("conn %p", conn); | |
1293 | ||
1294 | read_lock(&l->lock); | |
1295 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
1296 | if (sk->sk_type != SOCK_RAW) | |
1297 | continue; | |
1298 | ||
1299 | /* Don't send frame to the socket it came from */ | |
1300 | if (skb->sk == sk) | |
1301 | continue; | |
1302 | ||
1303 | if (!(nskb = skb_clone(skb, GFP_ATOMIC))) | |
1304 | continue; | |
1305 | ||
1306 | if (sock_queue_rcv_skb(sk, nskb)) | |
1307 | kfree_skb(nskb); | |
1308 | } | |
1309 | read_unlock(&l->lock); | |
1310 | } | |
1311 | ||
1312 | /* ---- L2CAP signalling commands ---- */ | |
1313 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1314 | u8 code, u8 ident, u16 dlen, void *data) | |
1315 | { | |
1316 | struct sk_buff *skb, **frag; | |
1317 | struct l2cap_cmd_hdr *cmd; | |
1318 | struct l2cap_hdr *lh; | |
1319 | int len, count; | |
1320 | ||
1321 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", conn, code, ident, dlen); | |
1322 | ||
1323 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1324 | count = min_t(unsigned int, conn->mtu, len); | |
1325 | ||
1326 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1327 | if (!skb) | |
1328 | return NULL; | |
1329 | ||
1330 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c YH |
1331 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
1332 | lh->cid = cpu_to_le16(0x0001); | |
1da177e4 LT |
1333 | |
1334 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1335 | cmd->code = code; | |
1336 | cmd->ident = ident; | |
aca3192c | 1337 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1338 | |
1339 | if (dlen) { | |
1340 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1341 | memcpy(skb_put(skb, count), data, count); | |
1342 | data += count; | |
1343 | } | |
1344 | ||
1345 | len -= skb->len; | |
1346 | ||
1347 | /* Continuation fragments (no L2CAP header) */ | |
1348 | frag = &skb_shinfo(skb)->frag_list; | |
1349 | while (len) { | |
1350 | count = min_t(unsigned int, conn->mtu, len); | |
1351 | ||
1352 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1353 | if (!*frag) | |
1354 | goto fail; | |
1355 | ||
1356 | memcpy(skb_put(*frag, count), data, count); | |
1357 | ||
1358 | len -= count; | |
1359 | data += count; | |
1360 | ||
1361 | frag = &(*frag)->next; | |
1362 | } | |
1363 | ||
1364 | return skb; | |
1365 | ||
1366 | fail: | |
1367 | kfree_skb(skb); | |
1368 | return NULL; | |
1369 | } | |
1370 | ||
1371 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1372 | { | |
1373 | struct l2cap_conf_opt *opt = *ptr; | |
1374 | int len; | |
1375 | ||
1376 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1377 | *ptr += len; | |
1378 | ||
1379 | *type = opt->type; | |
1380 | *olen = opt->len; | |
1381 | ||
1382 | switch (opt->len) { | |
1383 | case 1: | |
1384 | *val = *((u8 *) opt->val); | |
1385 | break; | |
1386 | ||
1387 | case 2: | |
861d6882 | 1388 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
1389 | break; |
1390 | ||
1391 | case 4: | |
861d6882 | 1392 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
1393 | break; |
1394 | ||
1395 | default: | |
1396 | *val = (unsigned long) opt->val; | |
1397 | break; | |
1398 | } | |
1399 | ||
1400 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1401 | return len; | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1405 | { | |
1406 | struct l2cap_conf_opt *opt = *ptr; | |
1407 | ||
1408 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1409 | ||
1410 | opt->type = type; | |
1411 | opt->len = len; | |
1412 | ||
1413 | switch (len) { | |
1414 | case 1: | |
1415 | *((u8 *) opt->val) = val; | |
1416 | break; | |
1417 | ||
1418 | case 2: | |
8e036fc3 | 1419 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
1420 | break; |
1421 | ||
1422 | case 4: | |
8e036fc3 | 1423 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
1424 | break; |
1425 | ||
1426 | default: | |
1427 | memcpy(opt->val, (void *) val, len); | |
1428 | break; | |
1429 | } | |
1430 | ||
1431 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1432 | } | |
1433 | ||
1434 | static int l2cap_build_conf_req(struct sock *sk, void *data) | |
1435 | { | |
1436 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1437 | struct l2cap_conf_req *req = data; | |
1438 | void *ptr = req->data; | |
1439 | ||
1440 | BT_DBG("sk %p", sk); | |
1441 | ||
1442 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
1443 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1444 | ||
1445 | /* FIXME: Need actual value of the flush timeout */ | |
1446 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
1447 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
1448 | ||
aca3192c YH |
1449 | req->dcid = cpu_to_le16(pi->dcid); |
1450 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1451 | |
1452 | return ptr - data; | |
1453 | } | |
1454 | ||
5dee9e7c | 1455 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1456 | { |
1457 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
1458 | struct l2cap_conf_rsp *rsp = data; |
1459 | void *ptr = rsp->data; | |
1460 | void *req = pi->conf_req; | |
1461 | int len = pi->conf_len; | |
1462 | int type, hint, olen; | |
1463 | unsigned long val; | |
6464f35f | 1464 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1465 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1466 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1467 | |
5dee9e7c | 1468 | BT_DBG("sk %p", sk); |
820ae1b8 | 1469 | |
5dee9e7c MH |
1470 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1471 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1472 | |
5dee9e7c MH |
1473 | hint = type & 0x80; |
1474 | type &= 0x7f; | |
1475 | ||
1476 | switch (type) { | |
1477 | case L2CAP_CONF_MTU: | |
861d6882 | 1478 | mtu = val; |
5dee9e7c MH |
1479 | break; |
1480 | ||
1481 | case L2CAP_CONF_FLUSH_TO: | |
1482 | pi->flush_to = val; | |
1483 | break; | |
1484 | ||
1485 | case L2CAP_CONF_QOS: | |
1486 | break; | |
1487 | ||
6464f35f MH |
1488 | case L2CAP_CONF_RFC: |
1489 | if (olen == sizeof(rfc)) | |
1490 | memcpy(&rfc, (void *) val, olen); | |
1491 | break; | |
1492 | ||
5dee9e7c MH |
1493 | default: |
1494 | if (hint) | |
1495 | break; | |
1496 | ||
1497 | result = L2CAP_CONF_UNKNOWN; | |
1498 | *((u8 *) ptr++) = type; | |
1499 | break; | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | if (result == L2CAP_CONF_SUCCESS) { | |
1504 | /* Configure output options and let the other side know | |
1505 | * which ones we don't like. */ | |
1506 | ||
6464f35f MH |
1507 | if (rfc.mode == L2CAP_MODE_BASIC) { |
1508 | if (mtu < pi->omtu) | |
1509 | result = L2CAP_CONF_UNACCEPT; | |
1510 | else { | |
1511 | pi->omtu = mtu; | |
1512 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1513 | } | |
1514 | ||
1515 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
1516 | } else { | |
5dee9e7c | 1517 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1518 | |
6464f35f MH |
1519 | memset(&rfc, 0, sizeof(rfc)); |
1520 | rfc.mode = L2CAP_MODE_BASIC; | |
1521 | ||
1522 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1523 | sizeof(rfc), (unsigned long) &rfc); | |
1524 | } | |
5dee9e7c MH |
1525 | } |
1526 | ||
1527 | rsp->scid = cpu_to_le16(pi->dcid); | |
1528 | rsp->result = cpu_to_le16(result); | |
1529 | rsp->flags = cpu_to_le16(0x0000); | |
1530 | ||
1531 | return ptr - data; | |
1da177e4 LT |
1532 | } |
1533 | ||
5dee9e7c | 1534 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1535 | { |
1536 | struct l2cap_conf_rsp *rsp = data; | |
1537 | void *ptr = rsp->data; | |
1da177e4 | 1538 | |
5dee9e7c | 1539 | BT_DBG("sk %p", sk); |
1da177e4 | 1540 | |
aca3192c | 1541 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1542 | rsp->result = cpu_to_le16(result); |
aca3192c | 1543 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1544 | |
1545 | return ptr - data; | |
1546 | } | |
1547 | ||
4e8402a3 MH |
1548 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1549 | { | |
1550 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
1551 | ||
1552 | if (rej->reason != 0x0000) | |
1553 | return 0; | |
1554 | ||
1555 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
1556 | cmd->ident == conn->info_ident) { | |
1557 | conn->info_ident = 0; | |
1558 | del_timer(&conn->info_timer); | |
1559 | l2cap_conn_start(conn); | |
1560 | } | |
1561 | ||
1562 | return 0; | |
1563 | } | |
1564 | ||
1da177e4 LT |
1565 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1566 | { | |
1567 | struct l2cap_chan_list *list = &conn->chan_list; | |
1568 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
1569 | struct l2cap_conn_rsp rsp; | |
1570 | struct sock *sk, *parent; | |
e7c29cb1 | 1571 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
1572 | |
1573 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 1574 | __le16 psm = req->psm; |
1da177e4 LT |
1575 | |
1576 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
1577 | ||
1578 | /* Check if we have socket listening on psm */ | |
1579 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
1580 | if (!parent) { | |
1581 | result = L2CAP_CR_BAD_PSM; | |
1582 | goto sendresp; | |
1583 | } | |
1584 | ||
e7c29cb1 MH |
1585 | /* Check if the ACL is secure enough (if not SDP) */ |
1586 | if (psm != cpu_to_le16(0x0001) && | |
1587 | !hci_conn_check_link_mode(conn->hcon)) { | |
1588 | result = L2CAP_CR_SEC_BLOCK; | |
1589 | goto response; | |
1590 | } | |
1591 | ||
1da177e4 LT |
1592 | result = L2CAP_CR_NO_MEM; |
1593 | ||
1594 | /* Check for backlog size */ | |
1595 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 1596 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
1597 | goto response; |
1598 | } | |
1599 | ||
3b1e0a65 | 1600 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
1601 | if (!sk) |
1602 | goto response; | |
1603 | ||
fd1278d7 | 1604 | write_lock_bh(&list->lock); |
1da177e4 LT |
1605 | |
1606 | /* Check if we already have channel with that dcid */ | |
1607 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 1608 | write_unlock_bh(&list->lock); |
1da177e4 LT |
1609 | sock_set_flag(sk, SOCK_ZAPPED); |
1610 | l2cap_sock_kill(sk); | |
1611 | goto response; | |
1612 | } | |
1613 | ||
1614 | hci_conn_hold(conn->hcon); | |
1615 | ||
1616 | l2cap_sock_init(sk, parent); | |
1617 | bacpy(&bt_sk(sk)->src, conn->src); | |
1618 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1619 | l2cap_pi(sk)->psm = psm; | |
1620 | l2cap_pi(sk)->dcid = scid; | |
1621 | ||
1622 | __l2cap_chan_add(conn, sk, parent); | |
1623 | dcid = l2cap_pi(sk)->scid; | |
1624 | ||
1625 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1626 | ||
1da177e4 LT |
1627 | l2cap_pi(sk)->ident = cmd->ident; |
1628 | ||
79d554a6 MH |
1629 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { |
1630 | if (l2cap_check_link_mode(sk)) { | |
1631 | sk->sk_state = BT_CONFIG; | |
1632 | result = L2CAP_CR_SUCCESS; | |
1633 | status = L2CAP_CS_NO_INFO; | |
1634 | } else { | |
1635 | sk->sk_state = BT_CONNECT2; | |
1636 | result = L2CAP_CR_PEND; | |
1637 | status = L2CAP_CS_AUTHEN_PEND; | |
1638 | } | |
1639 | } else { | |
1640 | sk->sk_state = BT_CONNECT2; | |
1641 | result = L2CAP_CR_PEND; | |
1642 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
1643 | } |
1644 | ||
fd1278d7 | 1645 | write_unlock_bh(&list->lock); |
1da177e4 LT |
1646 | |
1647 | response: | |
1648 | bh_unlock_sock(parent); | |
1649 | ||
1650 | sendresp: | |
aca3192c YH |
1651 | rsp.scid = cpu_to_le16(scid); |
1652 | rsp.dcid = cpu_to_le16(dcid); | |
1653 | rsp.result = cpu_to_le16(result); | |
1654 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 1655 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
1656 | |
1657 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
1658 | struct l2cap_info_req info; | |
1659 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1660 | ||
1661 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1662 | conn->info_ident = l2cap_get_ident(conn); | |
1663 | ||
1664 | mod_timer(&conn->info_timer, jiffies + | |
1665 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
1666 | ||
1667 | l2cap_send_cmd(conn, conn->info_ident, | |
1668 | L2CAP_INFO_REQ, sizeof(info), &info); | |
1669 | } | |
1670 | ||
1da177e4 LT |
1671 | return 0; |
1672 | } | |
1673 | ||
1674 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1675 | { | |
1676 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
1677 | u16 scid, dcid, result, status; | |
1678 | struct sock *sk; | |
1679 | u8 req[128]; | |
1680 | ||
1681 | scid = __le16_to_cpu(rsp->scid); | |
1682 | dcid = __le16_to_cpu(rsp->dcid); | |
1683 | result = __le16_to_cpu(rsp->result); | |
1684 | status = __le16_to_cpu(rsp->status); | |
1685 | ||
1686 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
1687 | ||
1688 | if (scid) { | |
1689 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid))) | |
1690 | return 0; | |
1691 | } else { | |
1692 | if (!(sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident))) | |
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | switch (result) { | |
1697 | case L2CAP_CR_SUCCESS: | |
1698 | sk->sk_state = BT_CONFIG; | |
1699 | l2cap_pi(sk)->ident = 0; | |
1700 | l2cap_pi(sk)->dcid = dcid; | |
1701 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
1702 | ||
1703 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1704 | l2cap_build_conf_req(sk, req), req); | |
1705 | break; | |
1706 | ||
1707 | case L2CAP_CR_PEND: | |
1708 | break; | |
1709 | ||
1710 | default: | |
1711 | l2cap_chan_del(sk, ECONNREFUSED); | |
1712 | break; | |
1713 | } | |
1714 | ||
1715 | bh_unlock_sock(sk); | |
1716 | return 0; | |
1717 | } | |
1718 | ||
88219a0f | 1719 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
1720 | { |
1721 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
1722 | u16 dcid, flags; | |
1723 | u8 rsp[64]; | |
1724 | struct sock *sk; | |
5dee9e7c | 1725 | int len; |
1da177e4 LT |
1726 | |
1727 | dcid = __le16_to_cpu(req->dcid); | |
1728 | flags = __le16_to_cpu(req->flags); | |
1729 | ||
1730 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
1731 | ||
1732 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid))) | |
1733 | return -ENOENT; | |
1734 | ||
354f60a9 MH |
1735 | if (sk->sk_state == BT_DISCONN) |
1736 | goto unlock; | |
1737 | ||
5dee9e7c | 1738 | /* Reject if config buffer is too small. */ |
88219a0f | 1739 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
1740 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
1741 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
1742 | l2cap_build_conf_rsp(sk, rsp, | |
1743 | L2CAP_CONF_REJECT, flags), rsp); | |
1744 | goto unlock; | |
1745 | } | |
1746 | ||
1747 | /* Store config. */ | |
1748 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
1749 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
1750 | |
1751 | if (flags & 0x0001) { | |
1752 | /* Incomplete config. Send empty response. */ | |
1753 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
1754 | l2cap_build_conf_rsp(sk, rsp, |
1755 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
1756 | goto unlock; |
1757 | } | |
1758 | ||
1759 | /* Complete config. */ | |
5dee9e7c MH |
1760 | len = l2cap_parse_conf_req(sk, rsp); |
1761 | if (len < 0) | |
1da177e4 LT |
1762 | goto unlock; |
1763 | ||
5dee9e7c MH |
1764 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
1765 | ||
5dee9e7c MH |
1766 | /* Reset config buffer. */ |
1767 | l2cap_pi(sk)->conf_len = 0; | |
1768 | ||
876d9484 MH |
1769 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
1770 | goto unlock; | |
1771 | ||
1da177e4 LT |
1772 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
1773 | sk->sk_state = BT_CONNECTED; | |
1774 | l2cap_chan_ready(sk); | |
876d9484 MH |
1775 | goto unlock; |
1776 | } | |
1777 | ||
1778 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 1779 | u8 buf[64]; |
1da177e4 | 1780 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 1781 | l2cap_build_conf_req(sk, buf), buf); |
1da177e4 LT |
1782 | } |
1783 | ||
1784 | unlock: | |
1785 | bh_unlock_sock(sk); | |
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1790 | { | |
1791 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
1792 | u16 scid, flags, result; | |
1793 | struct sock *sk; | |
1794 | ||
1795 | scid = __le16_to_cpu(rsp->scid); | |
1796 | flags = __le16_to_cpu(rsp->flags); | |
1797 | result = __le16_to_cpu(rsp->result); | |
1798 | ||
1799 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", scid, flags, result); | |
1800 | ||
1801 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid))) | |
1802 | return 0; | |
1803 | ||
1804 | switch (result) { | |
1805 | case L2CAP_CONF_SUCCESS: | |
1806 | break; | |
1807 | ||
1808 | case L2CAP_CONF_UNACCEPT: | |
1809 | if (++l2cap_pi(sk)->conf_retry < L2CAP_CONF_MAX_RETRIES) { | |
1810 | char req[128]; | |
1811 | /* It does not make sense to adjust L2CAP parameters | |
1812 | * that are currently defined in the spec. We simply | |
1813 | * resend config request that we sent earlier. It is | |
1814 | * stupid, but it helps qualification testing which | |
1815 | * expects at least some response from us. */ | |
1816 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1817 | l2cap_build_conf_req(sk, req), req); | |
1818 | goto done; | |
1819 | } | |
1820 | ||
8e87d142 | 1821 | default: |
1da177e4 | 1822 | sk->sk_state = BT_DISCONN; |
b1235d79 | 1823 | sk->sk_err = ECONNRESET; |
1da177e4 LT |
1824 | l2cap_sock_set_timer(sk, HZ * 5); |
1825 | { | |
1826 | struct l2cap_disconn_req req; | |
aca3192c YH |
1827 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1828 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1da177e4 LT |
1829 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
1830 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
1831 | } | |
1832 | goto done; | |
1833 | } | |
1834 | ||
1835 | if (flags & 0x01) | |
1836 | goto done; | |
1837 | ||
1da177e4 LT |
1838 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
1839 | ||
1840 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
1841 | sk->sk_state = BT_CONNECTED; | |
1842 | l2cap_chan_ready(sk); | |
1843 | } | |
1844 | ||
1845 | done: | |
1846 | bh_unlock_sock(sk); | |
1847 | return 0; | |
1848 | } | |
1849 | ||
1850 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1851 | { | |
1852 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
1853 | struct l2cap_disconn_rsp rsp; | |
1854 | u16 dcid, scid; | |
1855 | struct sock *sk; | |
1856 | ||
1857 | scid = __le16_to_cpu(req->scid); | |
1858 | dcid = __le16_to_cpu(req->dcid); | |
1859 | ||
1860 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
1861 | ||
1862 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid))) | |
1863 | return 0; | |
1864 | ||
aca3192c YH |
1865 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
1866 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
1867 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
1868 | ||
1869 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1870 | ||
1871 | l2cap_chan_del(sk, ECONNRESET); | |
1872 | bh_unlock_sock(sk); | |
1873 | ||
1874 | l2cap_sock_kill(sk); | |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1879 | { | |
1880 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
1881 | u16 dcid, scid; | |
1882 | struct sock *sk; | |
1883 | ||
1884 | scid = __le16_to_cpu(rsp->scid); | |
1885 | dcid = __le16_to_cpu(rsp->dcid); | |
1886 | ||
1887 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
1888 | ||
1889 | if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid))) | |
1890 | return 0; | |
1891 | ||
1892 | l2cap_chan_del(sk, 0); | |
1893 | bh_unlock_sock(sk); | |
1894 | ||
1895 | l2cap_sock_kill(sk); | |
1896 | return 0; | |
1897 | } | |
1898 | ||
1899 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1900 | { | |
1901 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
1902 | u16 type; |
1903 | ||
1904 | type = __le16_to_cpu(req->type); | |
1905 | ||
1906 | BT_DBG("type 0x%4.4x", type); | |
1907 | ||
f0709e03 MH |
1908 | if (type == L2CAP_IT_FEAT_MASK) { |
1909 | u8 buf[8]; | |
1910 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
1911 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1912 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
1913 | put_unaligned(cpu_to_le32(l2cap_feat_mask), (__le32 *) rsp->data); | |
1914 | l2cap_send_cmd(conn, cmd->ident, | |
1915 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
1916 | } else { | |
1917 | struct l2cap_info_rsp rsp; | |
1918 | rsp.type = cpu_to_le16(type); | |
1919 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
1920 | l2cap_send_cmd(conn, cmd->ident, | |
1921 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
1922 | } | |
1da177e4 LT |
1923 | |
1924 | return 0; | |
1925 | } | |
1926 | ||
1927 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
1928 | { | |
1929 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
1930 | u16 type, result; | |
1931 | ||
1932 | type = __le16_to_cpu(rsp->type); | |
1933 | result = __le16_to_cpu(rsp->result); | |
1934 | ||
1935 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
1936 | ||
4e8402a3 MH |
1937 | conn->info_ident = 0; |
1938 | ||
1939 | del_timer(&conn->info_timer); | |
1940 | ||
1941 | if (type == L2CAP_IT_FEAT_MASK) | |
83985319 | 1942 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 MH |
1943 | |
1944 | l2cap_conn_start(conn); | |
1945 | ||
1da177e4 LT |
1946 | return 0; |
1947 | } | |
1948 | ||
1949 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
1950 | { | |
1951 | u8 *data = skb->data; | |
1952 | int len = skb->len; | |
1953 | struct l2cap_cmd_hdr cmd; | |
1954 | int err = 0; | |
1955 | ||
1956 | l2cap_raw_recv(conn, skb); | |
1957 | ||
1958 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 1959 | u16 cmd_len; |
1da177e4 LT |
1960 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
1961 | data += L2CAP_CMD_HDR_SIZE; | |
1962 | len -= L2CAP_CMD_HDR_SIZE; | |
1963 | ||
88219a0f | 1964 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 1965 | |
88219a0f | 1966 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 1967 | |
88219a0f | 1968 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
1969 | BT_DBG("corrupted command"); |
1970 | break; | |
1971 | } | |
1972 | ||
1973 | switch (cmd.code) { | |
1974 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 1975 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
1976 | break; |
1977 | ||
1978 | case L2CAP_CONN_REQ: | |
1979 | err = l2cap_connect_req(conn, &cmd, data); | |
1980 | break; | |
1981 | ||
1982 | case L2CAP_CONN_RSP: | |
1983 | err = l2cap_connect_rsp(conn, &cmd, data); | |
1984 | break; | |
1985 | ||
1986 | case L2CAP_CONF_REQ: | |
88219a0f | 1987 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
1988 | break; |
1989 | ||
1990 | case L2CAP_CONF_RSP: | |
1991 | err = l2cap_config_rsp(conn, &cmd, data); | |
1992 | break; | |
1993 | ||
1994 | case L2CAP_DISCONN_REQ: | |
1995 | err = l2cap_disconnect_req(conn, &cmd, data); | |
1996 | break; | |
1997 | ||
1998 | case L2CAP_DISCONN_RSP: | |
1999 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
2000 | break; | |
2001 | ||
2002 | case L2CAP_ECHO_REQ: | |
88219a0f | 2003 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
2004 | break; |
2005 | ||
2006 | case L2CAP_ECHO_RSP: | |
2007 | break; | |
2008 | ||
2009 | case L2CAP_INFO_REQ: | |
2010 | err = l2cap_information_req(conn, &cmd, data); | |
2011 | break; | |
2012 | ||
2013 | case L2CAP_INFO_RSP: | |
2014 | err = l2cap_information_rsp(conn, &cmd, data); | |
2015 | break; | |
2016 | ||
2017 | default: | |
2018 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
2019 | err = -EINVAL; | |
2020 | break; | |
2021 | } | |
2022 | ||
2023 | if (err) { | |
2024 | struct l2cap_cmd_rej rej; | |
2025 | BT_DBG("error %d", err); | |
2026 | ||
2027 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2028 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2029 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2030 | } | |
2031 | ||
88219a0f AV |
2032 | data += cmd_len; |
2033 | len -= cmd_len; | |
1da177e4 LT |
2034 | } |
2035 | ||
2036 | kfree_skb(skb); | |
2037 | } | |
2038 | ||
2039 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) | |
2040 | { | |
2041 | struct sock *sk; | |
2042 | ||
2043 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
2044 | if (!sk) { | |
2045 | BT_DBG("unknown cid 0x%4.4x", cid); | |
2046 | goto drop; | |
2047 | } | |
2048 | ||
2049 | BT_DBG("sk %p, len %d", sk, skb->len); | |
2050 | ||
2051 | if (sk->sk_state != BT_CONNECTED) | |
2052 | goto drop; | |
2053 | ||
2054 | if (l2cap_pi(sk)->imtu < skb->len) | |
2055 | goto drop; | |
2056 | ||
2057 | /* If socket recv buffers overflows we drop data here | |
2058 | * which is *bad* because L2CAP has to be reliable. | |
2059 | * But we don't have any other choice. L2CAP doesn't | |
2060 | * provide flow control mechanism. */ | |
2061 | ||
2062 | if (!sock_queue_rcv_skb(sk, skb)) | |
2063 | goto done; | |
2064 | ||
2065 | drop: | |
2066 | kfree_skb(skb); | |
2067 | ||
2068 | done: | |
0139418c MH |
2069 | if (sk) |
2070 | bh_unlock_sock(sk); | |
2071 | ||
1da177e4 LT |
2072 | return 0; |
2073 | } | |
2074 | ||
8e036fc3 | 2075 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
2076 | { |
2077 | struct sock *sk; | |
2078 | ||
2079 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
2080 | if (!sk) | |
2081 | goto drop; | |
2082 | ||
2083 | BT_DBG("sk %p, len %d", sk, skb->len); | |
2084 | ||
2085 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
2086 | goto drop; | |
2087 | ||
2088 | if (l2cap_pi(sk)->imtu < skb->len) | |
2089 | goto drop; | |
2090 | ||
2091 | if (!sock_queue_rcv_skb(sk, skb)) | |
2092 | goto done; | |
2093 | ||
2094 | drop: | |
2095 | kfree_skb(skb); | |
2096 | ||
2097 | done: | |
2098 | if (sk) bh_unlock_sock(sk); | |
2099 | return 0; | |
2100 | } | |
2101 | ||
2102 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
2103 | { | |
2104 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
2105 | u16 cid, len; |
2106 | __le16 psm; | |
1da177e4 LT |
2107 | |
2108 | skb_pull(skb, L2CAP_HDR_SIZE); | |
2109 | cid = __le16_to_cpu(lh->cid); | |
2110 | len = __le16_to_cpu(lh->len); | |
2111 | ||
2112 | BT_DBG("len %d, cid 0x%4.4x", len, cid); | |
2113 | ||
2114 | switch (cid) { | |
2115 | case 0x0001: | |
2116 | l2cap_sig_channel(conn, skb); | |
2117 | break; | |
2118 | ||
2119 | case 0x0002: | |
8e036fc3 | 2120 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
2121 | skb_pull(skb, 2); |
2122 | l2cap_conless_channel(conn, psm, skb); | |
2123 | break; | |
2124 | ||
2125 | default: | |
2126 | l2cap_data_channel(conn, cid, skb); | |
2127 | break; | |
2128 | } | |
2129 | } | |
2130 | ||
2131 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
2132 | ||
2133 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
2134 | { | |
2135 | int exact = 0, lm1 = 0, lm2 = 0; | |
2136 | register struct sock *sk; | |
2137 | struct hlist_node *node; | |
2138 | ||
2139 | if (type != ACL_LINK) | |
2140 | return 0; | |
2141 | ||
2142 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
2143 | ||
2144 | /* Find listening sockets and check their link_mode */ | |
2145 | read_lock(&l2cap_sk_list.lock); | |
2146 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
2147 | if (sk->sk_state != BT_LISTEN) | |
2148 | continue; | |
2149 | ||
2150 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2151 | lm1 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode); | |
2152 | exact++; | |
2153 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
2154 | lm2 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode); | |
2155 | } | |
2156 | read_unlock(&l2cap_sk_list.lock); | |
2157 | ||
2158 | return exact ? lm1 : lm2; | |
2159 | } | |
2160 | ||
2161 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
2162 | { | |
0139418c MH |
2163 | struct l2cap_conn *conn; |
2164 | ||
1da177e4 LT |
2165 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
2166 | ||
2167 | if (hcon->type != ACL_LINK) | |
2168 | return 0; | |
2169 | ||
2170 | if (!status) { | |
1da177e4 LT |
2171 | conn = l2cap_conn_add(hcon, status); |
2172 | if (conn) | |
2173 | l2cap_conn_ready(conn); | |
0139418c | 2174 | } else |
1da177e4 LT |
2175 | l2cap_conn_del(hcon, bt_err(status)); |
2176 | ||
2177 | return 0; | |
2178 | } | |
2179 | ||
2180 | static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason) | |
2181 | { | |
2182 | BT_DBG("hcon %p reason %d", hcon, reason); | |
2183 | ||
2184 | if (hcon->type != ACL_LINK) | |
2185 | return 0; | |
2186 | ||
2187 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 2188 | |
1da177e4 LT |
2189 | return 0; |
2190 | } | |
2191 | ||
2192 | static int l2cap_auth_cfm(struct hci_conn *hcon, u8 status) | |
2193 | { | |
2194 | struct l2cap_chan_list *l; | |
40be492f | 2195 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 2196 | struct sock *sk; |
1da177e4 | 2197 | |
0139418c | 2198 | if (!conn) |
1da177e4 | 2199 | return 0; |
0139418c | 2200 | |
1da177e4 LT |
2201 | l = &conn->chan_list; |
2202 | ||
2203 | BT_DBG("conn %p", conn); | |
2204 | ||
2205 | read_lock(&l->lock); | |
2206 | ||
2207 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
40be492f MH |
2208 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2209 | ||
1da177e4 LT |
2210 | bh_lock_sock(sk); |
2211 | ||
40be492f | 2212 | if ((pi->link_mode & (L2CAP_LM_ENCRYPT | L2CAP_LM_SECURE)) && |
b1235d79 MH |
2213 | !(hcon->link_mode & HCI_LM_ENCRYPT) && |
2214 | !status) { | |
1da177e4 LT |
2215 | bh_unlock_sock(sk); |
2216 | continue; | |
2217 | } | |
2218 | ||
b1235d79 MH |
2219 | if (sk->sk_state == BT_CONNECT) { |
2220 | if (!status) { | |
2221 | struct l2cap_conn_req req; | |
2222 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2223 | req.psm = l2cap_pi(sk)->psm; | |
2224 | ||
2225 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); | |
2226 | ||
2227 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
2228 | L2CAP_CONN_REQ, sizeof(req), &req); | |
2229 | } else { | |
2230 | l2cap_sock_clear_timer(sk); | |
2231 | l2cap_sock_set_timer(sk, HZ / 10); | |
2232 | } | |
2233 | } else if (sk->sk_state == BT_CONNECT2) { | |
2234 | struct l2cap_conn_rsp rsp; | |
2235 | __u16 result; | |
2236 | ||
2237 | if (!status) { | |
2238 | sk->sk_state = BT_CONFIG; | |
2239 | result = L2CAP_CR_SUCCESS; | |
2240 | } else { | |
2241 | sk->sk_state = BT_DISCONN; | |
2242 | l2cap_sock_set_timer(sk, HZ / 10); | |
2243 | result = L2CAP_CR_SEC_BLOCK; | |
2244 | } | |
1da177e4 | 2245 | |
b1235d79 MH |
2246 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
2247 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2248 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 2249 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
2250 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2251 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2252 | } | |
1da177e4 LT |
2253 | |
2254 | bh_unlock_sock(sk); | |
2255 | } | |
2256 | ||
2257 | read_unlock(&l->lock); | |
b1235d79 | 2258 | |
1da177e4 LT |
2259 | return 0; |
2260 | } | |
2261 | ||
9719f8af | 2262 | static int l2cap_encrypt_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
2263 | { |
2264 | struct l2cap_chan_list *l; | |
0139418c | 2265 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 2266 | struct sock *sk; |
1da177e4 | 2267 | |
0139418c | 2268 | if (!conn) |
1da177e4 | 2269 | return 0; |
0139418c | 2270 | |
1da177e4 LT |
2271 | l = &conn->chan_list; |
2272 | ||
2273 | BT_DBG("conn %p", conn); | |
2274 | ||
2275 | read_lock(&l->lock); | |
2276 | ||
2277 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
9719f8af MH |
2278 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2279 | ||
1da177e4 LT |
2280 | bh_lock_sock(sk); |
2281 | ||
9719f8af MH |
2282 | if ((pi->link_mode & (L2CAP_LM_ENCRYPT | L2CAP_LM_SECURE)) && |
2283 | (sk->sk_state == BT_CONNECTED || | |
2284 | sk->sk_state == BT_CONFIG) && | |
2285 | !status && encrypt == 0x00) { | |
2286 | __l2cap_sock_close(sk, ECONNREFUSED); | |
2287 | bh_unlock_sock(sk); | |
2288 | continue; | |
2289 | } | |
2290 | ||
b1235d79 MH |
2291 | if (sk->sk_state == BT_CONNECT) { |
2292 | if (!status) { | |
2293 | struct l2cap_conn_req req; | |
2294 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2295 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 2296 | |
b1235d79 | 2297 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
1da177e4 | 2298 | |
b1235d79 MH |
2299 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2300 | L2CAP_CONN_REQ, sizeof(req), &req); | |
2301 | } else { | |
2302 | l2cap_sock_clear_timer(sk); | |
2303 | l2cap_sock_set_timer(sk, HZ / 10); | |
2304 | } | |
2305 | } else if (sk->sk_state == BT_CONNECT2) { | |
2306 | struct l2cap_conn_rsp rsp; | |
2307 | __u16 result; | |
1da177e4 | 2308 | |
b1235d79 MH |
2309 | if (!status) { |
2310 | sk->sk_state = BT_CONFIG; | |
2311 | result = L2CAP_CR_SUCCESS; | |
2312 | } else { | |
2313 | sk->sk_state = BT_DISCONN; | |
2314 | l2cap_sock_set_timer(sk, HZ / 10); | |
2315 | result = L2CAP_CR_SEC_BLOCK; | |
2316 | } | |
2317 | ||
2318 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
2319 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2320 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 2321 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
2322 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2323 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2324 | } | |
1da177e4 LT |
2325 | |
2326 | bh_unlock_sock(sk); | |
2327 | } | |
2328 | ||
2329 | read_unlock(&l->lock); | |
b1235d79 | 2330 | |
1da177e4 LT |
2331 | return 0; |
2332 | } | |
2333 | ||
2334 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
2335 | { | |
2336 | struct l2cap_conn *conn = hcon->l2cap_data; | |
2337 | ||
2338 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
2339 | goto drop; | |
2340 | ||
2341 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
2342 | ||
2343 | if (flags & ACL_START) { | |
2344 | struct l2cap_hdr *hdr; | |
2345 | int len; | |
2346 | ||
2347 | if (conn->rx_len) { | |
2348 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
2349 | kfree_skb(conn->rx_skb); | |
2350 | conn->rx_skb = NULL; | |
2351 | conn->rx_len = 0; | |
2352 | l2cap_conn_unreliable(conn, ECOMM); | |
2353 | } | |
2354 | ||
2355 | if (skb->len < 2) { | |
2356 | BT_ERR("Frame is too short (len %d)", skb->len); | |
2357 | l2cap_conn_unreliable(conn, ECOMM); | |
2358 | goto drop; | |
2359 | } | |
2360 | ||
2361 | hdr = (struct l2cap_hdr *) skb->data; | |
2362 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
2363 | ||
2364 | if (len == skb->len) { | |
2365 | /* Complete frame received */ | |
2366 | l2cap_recv_frame(conn, skb); | |
2367 | return 0; | |
2368 | } | |
2369 | ||
2370 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
2371 | ||
2372 | if (skb->len > len) { | |
2373 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2374 | skb->len, len); | |
2375 | l2cap_conn_unreliable(conn, ECOMM); | |
2376 | goto drop; | |
2377 | } | |
2378 | ||
2379 | /* Allocate skb for the complete frame (with header) */ | |
2380 | if (!(conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC))) | |
2381 | goto drop; | |
2382 | ||
d626f62b ACM |
2383 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2384 | skb->len); | |
1da177e4 LT |
2385 | conn->rx_len = len - skb->len; |
2386 | } else { | |
2387 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
2388 | ||
2389 | if (!conn->rx_len) { | |
2390 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
2391 | l2cap_conn_unreliable(conn, ECOMM); | |
2392 | goto drop; | |
2393 | } | |
2394 | ||
2395 | if (skb->len > conn->rx_len) { | |
2396 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2397 | skb->len, conn->rx_len); | |
2398 | kfree_skb(conn->rx_skb); | |
2399 | conn->rx_skb = NULL; | |
2400 | conn->rx_len = 0; | |
2401 | l2cap_conn_unreliable(conn, ECOMM); | |
2402 | goto drop; | |
2403 | } | |
2404 | ||
d626f62b ACM |
2405 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
2406 | skb->len); | |
1da177e4 LT |
2407 | conn->rx_len -= skb->len; |
2408 | ||
2409 | if (!conn->rx_len) { | |
2410 | /* Complete frame received */ | |
2411 | l2cap_recv_frame(conn, conn->rx_skb); | |
2412 | conn->rx_skb = NULL; | |
2413 | } | |
2414 | } | |
2415 | ||
2416 | drop: | |
2417 | kfree_skb(skb); | |
2418 | return 0; | |
2419 | } | |
2420 | ||
be9d1227 | 2421 | static ssize_t l2cap_sysfs_show(struct class *dev, char *buf) |
1da177e4 LT |
2422 | { |
2423 | struct sock *sk; | |
2424 | struct hlist_node *node; | |
be9d1227 | 2425 | char *str = buf; |
1da177e4 LT |
2426 | |
2427 | read_lock_bh(&l2cap_sk_list.lock); | |
2428 | ||
be9d1227 MH |
2429 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
2430 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1da177e4 | 2431 | |
be9d1227 MH |
2432 | str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d 0x%x\n", |
2433 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), | |
73863976 MH |
2434 | sk->sk_state, btohs(pi->psm), pi->scid, pi->dcid, |
2435 | pi->imtu, pi->omtu, pi->link_mode); | |
be9d1227 | 2436 | } |
1da177e4 | 2437 | |
1da177e4 | 2438 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 2439 | |
be9d1227 | 2440 | return (str - buf); |
1da177e4 LT |
2441 | } |
2442 | ||
be9d1227 | 2443 | static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL); |
1da177e4 | 2444 | |
90ddc4f0 | 2445 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
2446 | .family = PF_BLUETOOTH, |
2447 | .owner = THIS_MODULE, | |
2448 | .release = l2cap_sock_release, | |
2449 | .bind = l2cap_sock_bind, | |
2450 | .connect = l2cap_sock_connect, | |
2451 | .listen = l2cap_sock_listen, | |
2452 | .accept = l2cap_sock_accept, | |
2453 | .getname = l2cap_sock_getname, | |
2454 | .sendmsg = l2cap_sock_sendmsg, | |
2455 | .recvmsg = bt_sock_recvmsg, | |
2456 | .poll = bt_sock_poll, | |
3241ad82 | 2457 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
2458 | .mmap = sock_no_mmap, |
2459 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
2460 | .shutdown = l2cap_sock_shutdown, |
2461 | .setsockopt = l2cap_sock_setsockopt, | |
2462 | .getsockopt = l2cap_sock_getsockopt | |
2463 | }; | |
2464 | ||
2465 | static struct net_proto_family l2cap_sock_family_ops = { | |
2466 | .family = PF_BLUETOOTH, | |
2467 | .owner = THIS_MODULE, | |
2468 | .create = l2cap_sock_create, | |
2469 | }; | |
2470 | ||
2471 | static struct hci_proto l2cap_hci_proto = { | |
2472 | .name = "L2CAP", | |
2473 | .id = HCI_PROTO_L2CAP, | |
2474 | .connect_ind = l2cap_connect_ind, | |
2475 | .connect_cfm = l2cap_connect_cfm, | |
2476 | .disconn_ind = l2cap_disconn_ind, | |
2477 | .auth_cfm = l2cap_auth_cfm, | |
2478 | .encrypt_cfm = l2cap_encrypt_cfm, | |
2479 | .recv_acldata = l2cap_recv_acldata | |
2480 | }; | |
2481 | ||
2482 | static int __init l2cap_init(void) | |
2483 | { | |
2484 | int err; | |
be9d1227 | 2485 | |
1da177e4 LT |
2486 | err = proto_register(&l2cap_proto, 0); |
2487 | if (err < 0) | |
2488 | return err; | |
2489 | ||
2490 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); | |
2491 | if (err < 0) { | |
2492 | BT_ERR("L2CAP socket registration failed"); | |
2493 | goto error; | |
2494 | } | |
2495 | ||
2496 | err = hci_register_proto(&l2cap_hci_proto); | |
2497 | if (err < 0) { | |
2498 | BT_ERR("L2CAP protocol registration failed"); | |
2499 | bt_sock_unregister(BTPROTO_L2CAP); | |
2500 | goto error; | |
2501 | } | |
2502 | ||
df5c37ea MH |
2503 | if (class_create_file(bt_class, &class_attr_l2cap) < 0) |
2504 | BT_ERR("Failed to create L2CAP info file"); | |
1da177e4 LT |
2505 | |
2506 | BT_INFO("L2CAP ver %s", VERSION); | |
2507 | BT_INFO("L2CAP socket layer initialized"); | |
2508 | ||
2509 | return 0; | |
2510 | ||
2511 | error: | |
2512 | proto_unregister(&l2cap_proto); | |
2513 | return err; | |
2514 | } | |
2515 | ||
2516 | static void __exit l2cap_exit(void) | |
2517 | { | |
a91f2e39 | 2518 | class_remove_file(bt_class, &class_attr_l2cap); |
1da177e4 LT |
2519 | |
2520 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) | |
2521 | BT_ERR("L2CAP socket unregistration failed"); | |
2522 | ||
2523 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
2524 | BT_ERR("L2CAP protocol unregistration failed"); | |
2525 | ||
2526 | proto_unregister(&l2cap_proto); | |
2527 | } | |
2528 | ||
2529 | void l2cap_load(void) | |
2530 | { | |
2531 | /* Dummy function to trigger automatic L2CAP module loading by | |
2532 | * other modules that use L2CAP sockets but don't use any other | |
2533 | * symbols from it. */ | |
2534 | return; | |
2535 | } | |
2536 | EXPORT_SYMBOL(l2cap_load); | |
2537 | ||
2538 | module_init(l2cap_init); | |
2539 | module_exit(l2cap_exit); | |
2540 | ||
63fbd24e | 2541 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
2542 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
2543 | MODULE_VERSION(VERSION); | |
2544 | MODULE_LICENSE("GPL"); | |
2545 | MODULE_ALIAS("bt-proto-0"); |