Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
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> |
af05b30b | 43 | #include <linux/uaccess.h> |
1da177e4 LT |
44 | #include <net/sock.h> |
45 | ||
46 | #include <asm/system.h> | |
1da177e4 LT |
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 | ||
44dd46de MH |
53 | #define VERSION "2.14" |
54 | ||
55 | static int enable_ertm = 0; | |
f0709e03 | 56 | |
47ec1dcd | 57 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 58 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 59 | |
90ddc4f0 | 60 | static const struct proto_ops l2cap_sock_ops; |
1da177e4 LT |
61 | |
62 | static struct bt_sock_list l2cap_sk_list = { | |
d5fb2962 | 63 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
64 | }; |
65 | ||
1da177e4 LT |
66 | static void __l2cap_sock_close(struct sock *sk, int reason); |
67 | static void l2cap_sock_close(struct sock *sk); | |
68 | static void l2cap_sock_kill(struct sock *sk); | |
69 | ||
70 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
71 | u8 code, u8 ident, u16 dlen, void *data); | |
72 | ||
73 | /* ---- L2CAP timers ---- */ | |
74 | static void l2cap_sock_timeout(unsigned long arg) | |
75 | { | |
76 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 77 | int reason; |
1da177e4 LT |
78 | |
79 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
80 | ||
81 | bh_lock_sock(sk); | |
b1235d79 | 82 | |
f62e4323 MH |
83 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) |
84 | reason = ECONNREFUSED; | |
85 | else if (sk->sk_state == BT_CONNECT && | |
2af6b9d5 | 86 | l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) |
b1235d79 MH |
87 | reason = ECONNREFUSED; |
88 | else | |
89 | reason = ETIMEDOUT; | |
90 | ||
91 | __l2cap_sock_close(sk, reason); | |
92 | ||
1da177e4 LT |
93 | bh_unlock_sock(sk); |
94 | ||
95 | l2cap_sock_kill(sk); | |
96 | sock_put(sk); | |
97 | } | |
98 | ||
99 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
100 | { | |
101 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
102 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
103 | } | |
104 | ||
105 | static void l2cap_sock_clear_timer(struct sock *sk) | |
106 | { | |
107 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
108 | sk_stop_timer(sk, &sk->sk_timer); | |
109 | } | |
110 | ||
0139418c MH |
111 | /* ---- L2CAP channels ---- */ |
112 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
113 | { | |
114 | struct sock *s; | |
115 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
116 | if (l2cap_pi(s)->dcid == cid) | |
117 | break; | |
118 | } | |
119 | return s; | |
120 | } | |
121 | ||
122 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
123 | { | |
124 | struct sock *s; | |
125 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
126 | if (l2cap_pi(s)->scid == cid) | |
127 | break; | |
128 | } | |
129 | return s; | |
130 | } | |
131 | ||
132 | /* Find channel with given SCID. | |
133 | * Returns locked socket */ | |
134 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
135 | { | |
136 | struct sock *s; | |
137 | read_lock(&l->lock); | |
138 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
139 | if (s) |
140 | bh_lock_sock(s); | |
0139418c MH |
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); | |
af05b30b GP |
160 | if (s) |
161 | bh_lock_sock(s); | |
0139418c MH |
162 | read_unlock(&l->lock); |
163 | return s; | |
164 | } | |
165 | ||
166 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
167 | { | |
8db4dc46 | 168 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 169 | |
8db4dc46 | 170 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 171 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
172 | return cid; |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
179 | { | |
180 | sock_hold(sk); | |
181 | ||
182 | if (l->head) | |
183 | l2cap_pi(l->head)->prev_c = sk; | |
184 | ||
185 | l2cap_pi(sk)->next_c = l->head; | |
186 | l2cap_pi(sk)->prev_c = NULL; | |
187 | l->head = sk; | |
188 | } | |
189 | ||
190 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
191 | { | |
192 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
193 | ||
fd1278d7 | 194 | write_lock_bh(&l->lock); |
0139418c MH |
195 | if (sk == l->head) |
196 | l->head = next; | |
197 | ||
198 | if (next) | |
199 | l2cap_pi(next)->prev_c = prev; | |
200 | if (prev) | |
201 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 202 | write_unlock_bh(&l->lock); |
0139418c MH |
203 | |
204 | __sock_put(sk); | |
205 | } | |
206 | ||
207 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
208 | { | |
209 | struct l2cap_chan_list *l = &conn->chan_list; | |
210 | ||
af05b30b GP |
211 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
212 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 213 | |
2950f21a MH |
214 | conn->disc_reason = 0x13; |
215 | ||
0139418c MH |
216 | l2cap_pi(sk)->conn = conn; |
217 | ||
218 | if (sk->sk_type == SOCK_SEQPACKET) { | |
219 | /* Alloc CID for connection-oriented socket */ | |
220 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
221 | } else if (sk->sk_type == SOCK_DGRAM) { | |
222 | /* Connectionless socket */ | |
8db4dc46 GP |
223 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
224 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
225 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
226 | } else { | |
227 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
228 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
229 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
230 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
231 | } | |
232 | ||
233 | __l2cap_chan_link(l, sk); | |
234 | ||
235 | if (parent) | |
236 | bt_accept_enqueue(parent, sk); | |
237 | } | |
238 | ||
8e87d142 | 239 | /* Delete channel. |
0139418c MH |
240 | * Must be called on the locked socket. */ |
241 | static void l2cap_chan_del(struct sock *sk, int err) | |
242 | { | |
243 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
244 | struct sock *parent = bt_sk(sk)->parent; | |
245 | ||
246 | l2cap_sock_clear_timer(sk); | |
247 | ||
248 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
249 | ||
8e87d142 | 250 | if (conn) { |
0139418c MH |
251 | /* Unlink from channel list */ |
252 | l2cap_chan_unlink(&conn->chan_list, sk); | |
253 | l2cap_pi(sk)->conn = NULL; | |
254 | hci_conn_put(conn->hcon); | |
255 | } | |
256 | ||
b1235d79 | 257 | sk->sk_state = BT_CLOSED; |
0139418c MH |
258 | sock_set_flag(sk, SOCK_ZAPPED); |
259 | ||
260 | if (err) | |
261 | sk->sk_err = err; | |
262 | ||
263 | if (parent) { | |
264 | bt_accept_unlink(sk); | |
265 | parent->sk_data_ready(parent, 0); | |
266 | } else | |
267 | sk->sk_state_change(sk); | |
268 | } | |
269 | ||
79d554a6 | 270 | /* Service level security */ |
2af6b9d5 | 271 | static inline int l2cap_check_security(struct sock *sk) |
79d554a6 MH |
272 | { |
273 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
0684e5f9 MH |
274 | __u8 auth_type; |
275 | ||
00ae4af9 MH |
276 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
277 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
278 | auth_type = HCI_AT_NO_BONDING_MITM; | |
279 | else | |
af05b30b | 280 | auth_type = HCI_AT_NO_BONDING; |
00ae4af9 MH |
281 | |
282 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
283 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
284 | } else { | |
285 | switch (l2cap_pi(sk)->sec_level) { | |
286 | case BT_SECURITY_HIGH: | |
287 | auth_type = HCI_AT_GENERAL_BONDING_MITM; | |
288 | break; | |
289 | case BT_SECURITY_MEDIUM: | |
290 | auth_type = HCI_AT_GENERAL_BONDING; | |
291 | break; | |
292 | default: | |
293 | auth_type = HCI_AT_NO_BONDING; | |
294 | break; | |
295 | } | |
0684e5f9 | 296 | } |
79d554a6 | 297 | |
0684e5f9 MH |
298 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
299 | auth_type); | |
79d554a6 MH |
300 | } |
301 | ||
4e8402a3 MH |
302 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
303 | { | |
304 | u8 id; | |
305 | ||
306 | /* Get next available identificator. | |
307 | * 1 - 128 are used by kernel. | |
308 | * 129 - 199 are reserved. | |
309 | * 200 - 254 are used by utilities like l2ping, etc. | |
310 | */ | |
311 | ||
312 | spin_lock_bh(&conn->lock); | |
313 | ||
314 | if (++conn->tx_ident > 128) | |
315 | conn->tx_ident = 1; | |
316 | ||
317 | id = conn->tx_ident; | |
318 | ||
319 | spin_unlock_bh(&conn->lock); | |
320 | ||
321 | return id; | |
322 | } | |
323 | ||
324 | static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) | |
325 | { | |
326 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
327 | ||
328 | BT_DBG("code 0x%2.2x", code); | |
329 | ||
330 | if (!skb) | |
331 | return -ENOMEM; | |
332 | ||
333 | return hci_send_acl(conn->hcon, skb, 0); | |
334 | } | |
335 | ||
79d554a6 MH |
336 | static void l2cap_do_start(struct sock *sk) |
337 | { | |
338 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
339 | ||
340 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
341 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
342 | return; | |
343 | ||
2af6b9d5 | 344 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
345 | struct l2cap_conn_req req; |
346 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
347 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 348 | |
b1235d79 | 349 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 350 | |
b1235d79 | 351 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 352 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 353 | } |
79d554a6 MH |
354 | } else { |
355 | struct l2cap_info_req req; | |
356 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
357 | ||
358 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
359 | conn->info_ident = l2cap_get_ident(conn); | |
360 | ||
361 | mod_timer(&conn->info_timer, jiffies + | |
362 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
363 | ||
364 | l2cap_send_cmd(conn, conn->info_ident, | |
365 | L2CAP_INFO_REQ, sizeof(req), &req); | |
366 | } | |
367 | } | |
368 | ||
1da177e4 | 369 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
370 | static void l2cap_conn_start(struct l2cap_conn *conn) |
371 | { | |
372 | struct l2cap_chan_list *l = &conn->chan_list; | |
373 | struct sock *sk; | |
374 | ||
375 | BT_DBG("conn %p", conn); | |
376 | ||
377 | read_lock(&l->lock); | |
378 | ||
379 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
380 | bh_lock_sock(sk); | |
381 | ||
382 | if (sk->sk_type != SOCK_SEQPACKET) { | |
79d554a6 MH |
383 | bh_unlock_sock(sk); |
384 | continue; | |
385 | } | |
386 | ||
387 | if (sk->sk_state == BT_CONNECT) { | |
2af6b9d5 | 388 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
389 | struct l2cap_conn_req req; |
390 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
391 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 392 | |
b1235d79 | 393 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 394 | |
b1235d79 | 395 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 396 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 397 | } |
79d554a6 MH |
398 | } else if (sk->sk_state == BT_CONNECT2) { |
399 | struct l2cap_conn_rsp rsp; | |
400 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
401 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
402 | ||
2af6b9d5 | 403 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
404 | if (bt_sk(sk)->defer_setup) { |
405 | struct sock *parent = bt_sk(sk)->parent; | |
406 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
407 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
408 | parent->sk_data_ready(parent, 0); | |
409 | ||
410 | } else { | |
411 | sk->sk_state = BT_CONFIG; | |
412 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
413 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
414 | } | |
79d554a6 MH |
415 | } else { |
416 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
417 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
418 | } | |
419 | ||
420 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
421 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
422 | } |
423 | ||
424 | bh_unlock_sock(sk); | |
425 | } | |
426 | ||
427 | read_unlock(&l->lock); | |
428 | } | |
429 | ||
430 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
431 | { | |
79d554a6 MH |
432 | struct l2cap_chan_list *l = &conn->chan_list; |
433 | struct sock *sk; | |
4e8402a3 | 434 | |
79d554a6 | 435 | BT_DBG("conn %p", conn); |
4e8402a3 | 436 | |
79d554a6 | 437 | read_lock(&l->lock); |
4e8402a3 | 438 | |
79d554a6 MH |
439 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
440 | bh_lock_sock(sk); | |
4e8402a3 | 441 | |
79d554a6 MH |
442 | if (sk->sk_type != SOCK_SEQPACKET) { |
443 | l2cap_sock_clear_timer(sk); | |
444 | sk->sk_state = BT_CONNECTED; | |
445 | sk->sk_state_change(sk); | |
446 | } else if (sk->sk_state == BT_CONNECT) | |
447 | l2cap_do_start(sk); | |
4e8402a3 | 448 | |
79d554a6 | 449 | bh_unlock_sock(sk); |
4e8402a3 | 450 | } |
79d554a6 MH |
451 | |
452 | read_unlock(&l->lock); | |
4e8402a3 MH |
453 | } |
454 | ||
455 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
456 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
457 | { | |
458 | struct l2cap_chan_list *l = &conn->chan_list; | |
459 | struct sock *sk; | |
460 | ||
461 | BT_DBG("conn %p", conn); | |
462 | ||
463 | read_lock(&l->lock); | |
464 | ||
465 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 466 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
467 | sk->sk_err = err; |
468 | } | |
469 | ||
470 | read_unlock(&l->lock); | |
471 | } | |
472 | ||
473 | static void l2cap_info_timeout(unsigned long arg) | |
474 | { | |
475 | struct l2cap_conn *conn = (void *) arg; | |
476 | ||
984947dc | 477 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 478 | conn->info_ident = 0; |
984947dc | 479 | |
4e8402a3 MH |
480 | l2cap_conn_start(conn); |
481 | } | |
482 | ||
1da177e4 LT |
483 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
484 | { | |
0139418c | 485 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 486 | |
0139418c | 487 | if (conn || status) |
1da177e4 LT |
488 | return conn; |
489 | ||
0139418c MH |
490 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
491 | if (!conn) | |
1da177e4 | 492 | return NULL; |
1da177e4 LT |
493 | |
494 | hcon->l2cap_data = conn; | |
495 | conn->hcon = hcon; | |
496 | ||
0139418c MH |
497 | BT_DBG("hcon %p conn %p", hcon, conn); |
498 | ||
1da177e4 LT |
499 | conn->mtu = hcon->hdev->acl_mtu; |
500 | conn->src = &hcon->hdev->bdaddr; | |
501 | conn->dst = &hcon->dst; | |
502 | ||
4e8402a3 MH |
503 | conn->feat_mask = 0; |
504 | ||
b1235d79 MH |
505 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
506 | (unsigned long) conn); | |
4e8402a3 | 507 | |
1da177e4 LT |
508 | spin_lock_init(&conn->lock); |
509 | rwlock_init(&conn->chan_list.lock); | |
510 | ||
2950f21a MH |
511 | conn->disc_reason = 0x13; |
512 | ||
1da177e4 LT |
513 | return conn; |
514 | } | |
515 | ||
0139418c | 516 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 517 | { |
0139418c | 518 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
519 | struct sock *sk; |
520 | ||
0139418c MH |
521 | if (!conn) |
522 | return; | |
1da177e4 LT |
523 | |
524 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
525 | ||
7585b97a | 526 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
527 | |
528 | /* Kill channels */ | |
529 | while ((sk = conn->chan_list.head)) { | |
530 | bh_lock_sock(sk); | |
531 | l2cap_chan_del(sk, err); | |
532 | bh_unlock_sock(sk); | |
533 | l2cap_sock_kill(sk); | |
534 | } | |
535 | ||
8e8440f5 DY |
536 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
537 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 538 | |
1da177e4 LT |
539 | hcon->l2cap_data = NULL; |
540 | kfree(conn); | |
1da177e4 LT |
541 | } |
542 | ||
543 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
544 | { | |
545 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 546 | write_lock_bh(&l->lock); |
1da177e4 | 547 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 548 | write_unlock_bh(&l->lock); |
1da177e4 LT |
549 | } |
550 | ||
1da177e4 | 551 | /* ---- Socket interface ---- */ |
8e036fc3 | 552 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
553 | { |
554 | struct sock *sk; | |
555 | struct hlist_node *node; | |
556 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
557 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
558 | goto found; | |
559 | sk = NULL; | |
560 | found: | |
561 | return sk; | |
562 | } | |
563 | ||
564 | /* Find socket with psm and source bdaddr. | |
565 | * Returns closest match. | |
566 | */ | |
8e036fc3 | 567 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
568 | { |
569 | struct sock *sk = NULL, *sk1 = NULL; | |
570 | struct hlist_node *node; | |
571 | ||
572 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
573 | if (state && sk->sk_state != state) | |
574 | continue; | |
575 | ||
576 | if (l2cap_pi(sk)->psm == psm) { | |
577 | /* Exact match. */ | |
578 | if (!bacmp(&bt_sk(sk)->src, src)) | |
579 | break; | |
580 | ||
581 | /* Closest match */ | |
582 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
583 | sk1 = sk; | |
584 | } | |
585 | } | |
586 | return node ? sk : sk1; | |
587 | } | |
588 | ||
589 | /* Find socket with given address (psm, src). | |
590 | * Returns locked socket */ | |
8e036fc3 | 591 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
592 | { |
593 | struct sock *s; | |
594 | read_lock(&l2cap_sk_list.lock); | |
595 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
af05b30b GP |
596 | if (s) |
597 | bh_lock_sock(s); | |
1da177e4 LT |
598 | read_unlock(&l2cap_sk_list.lock); |
599 | return s; | |
600 | } | |
601 | ||
602 | static void l2cap_sock_destruct(struct sock *sk) | |
603 | { | |
604 | BT_DBG("sk %p", sk); | |
605 | ||
606 | skb_queue_purge(&sk->sk_receive_queue); | |
607 | skb_queue_purge(&sk->sk_write_queue); | |
608 | } | |
609 | ||
610 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
611 | { | |
612 | struct sock *sk; | |
613 | ||
614 | BT_DBG("parent %p", parent); | |
615 | ||
616 | /* Close not yet accepted channels */ | |
617 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
618 | l2cap_sock_close(sk); | |
619 | ||
b1235d79 | 620 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
621 | sock_set_flag(parent, SOCK_ZAPPED); |
622 | } | |
623 | ||
624 | /* Kill socket (only if zapped and orphan) | |
625 | * Must be called on unlocked socket. | |
626 | */ | |
627 | static void l2cap_sock_kill(struct sock *sk) | |
628 | { | |
629 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
630 | return; | |
631 | ||
632 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
633 | ||
634 | /* Kill poor orphan */ | |
635 | bt_sock_unlink(&l2cap_sk_list, sk); | |
636 | sock_set_flag(sk, SOCK_DEAD); | |
637 | sock_put(sk); | |
638 | } | |
639 | ||
640 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
641 | { | |
642 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
643 | ||
644 | switch (sk->sk_state) { | |
645 | case BT_LISTEN: | |
646 | l2cap_sock_cleanup_listen(sk); | |
647 | break; | |
648 | ||
649 | case BT_CONNECTED: | |
650 | case BT_CONFIG: | |
1da177e4 LT |
651 | if (sk->sk_type == SOCK_SEQPACKET) { |
652 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
653 | struct l2cap_disconn_req req; | |
654 | ||
655 | sk->sk_state = BT_DISCONN; | |
656 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
657 | ||
aca3192c YH |
658 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
659 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1da177e4 LT |
660 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
661 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
b1235d79 | 662 | } else |
1da177e4 | 663 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
664 | break; |
665 | ||
f66dc81f MH |
666 | case BT_CONNECT2: |
667 | if (sk->sk_type == SOCK_SEQPACKET) { | |
668 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
669 | struct l2cap_conn_rsp rsp; | |
670 | __u16 result; | |
671 | ||
672 | if (bt_sk(sk)->defer_setup) | |
673 | result = L2CAP_CR_SEC_BLOCK; | |
674 | else | |
675 | result = L2CAP_CR_BAD_PSM; | |
676 | ||
677 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
678 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
679 | rsp.result = cpu_to_le16(result); | |
680 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
681 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
682 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
683 | } else | |
684 | l2cap_chan_del(sk, reason); | |
685 | break; | |
686 | ||
1da177e4 LT |
687 | case BT_CONNECT: |
688 | case BT_DISCONN: | |
689 | l2cap_chan_del(sk, reason); | |
690 | break; | |
691 | ||
692 | default: | |
693 | sock_set_flag(sk, SOCK_ZAPPED); | |
694 | break; | |
695 | } | |
696 | } | |
697 | ||
698 | /* Must be called on unlocked socket. */ | |
699 | static void l2cap_sock_close(struct sock *sk) | |
700 | { | |
701 | l2cap_sock_clear_timer(sk); | |
702 | lock_sock(sk); | |
703 | __l2cap_sock_close(sk, ECONNRESET); | |
704 | release_sock(sk); | |
705 | l2cap_sock_kill(sk); | |
706 | } | |
707 | ||
708 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
709 | { | |
710 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
711 | ||
712 | BT_DBG("sk %p", sk); | |
713 | ||
714 | if (parent) { | |
715 | sk->sk_type = parent->sk_type; | |
f66dc81f MH |
716 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
717 | ||
1da177e4 LT |
718 | pi->imtu = l2cap_pi(parent)->imtu; |
719 | pi->omtu = l2cap_pi(parent)->omtu; | |
c6b03cf9 MH |
720 | pi->mode = l2cap_pi(parent)->mode; |
721 | pi->fcs = l2cap_pi(parent)->fcs; | |
2af6b9d5 MH |
722 | pi->sec_level = l2cap_pi(parent)->sec_level; |
723 | pi->role_switch = l2cap_pi(parent)->role_switch; | |
724 | pi->force_reliable = l2cap_pi(parent)->force_reliable; | |
1da177e4 LT |
725 | } else { |
726 | pi->imtu = L2CAP_DEFAULT_MTU; | |
727 | pi->omtu = 0; | |
c6b03cf9 MH |
728 | pi->mode = L2CAP_MODE_BASIC; |
729 | pi->fcs = L2CAP_FCS_CRC16; | |
2af6b9d5 MH |
730 | pi->sec_level = BT_SECURITY_LOW; |
731 | pi->role_switch = 0; | |
732 | pi->force_reliable = 0; | |
1da177e4 LT |
733 | } |
734 | ||
735 | /* Default config options */ | |
5dee9e7c | 736 | pi->conf_len = 0; |
1da177e4 LT |
737 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
738 | } | |
739 | ||
740 | static struct proto l2cap_proto = { | |
741 | .name = "L2CAP", | |
742 | .owner = THIS_MODULE, | |
743 | .obj_size = sizeof(struct l2cap_pinfo) | |
744 | }; | |
745 | ||
1b8d7ae4 | 746 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
747 | { |
748 | struct sock *sk; | |
749 | ||
6257ff21 | 750 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
751 | if (!sk) |
752 | return NULL; | |
753 | ||
754 | sock_init_data(sock, sk); | |
755 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
756 | ||
757 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 758 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
759 | |
760 | sock_reset_flag(sk, SOCK_ZAPPED); | |
761 | ||
762 | sk->sk_protocol = proto; | |
b1235d79 | 763 | sk->sk_state = BT_OPEN; |
1da177e4 | 764 | |
b1235d79 | 765 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
766 | |
767 | bt_sock_link(&l2cap_sk_list, sk); | |
768 | return sk; | |
769 | } | |
770 | ||
1b8d7ae4 | 771 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
772 | { |
773 | struct sock *sk; | |
774 | ||
775 | BT_DBG("sock %p", sock); | |
776 | ||
777 | sock->state = SS_UNCONNECTED; | |
778 | ||
779 | if (sock->type != SOCK_SEQPACKET && | |
780 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) | |
781 | return -ESOCKTNOSUPPORT; | |
782 | ||
783 | if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW)) | |
784 | return -EPERM; | |
785 | ||
786 | sock->ops = &l2cap_sock_ops; | |
787 | ||
1b8d7ae4 | 788 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
789 | if (!sk) |
790 | return -ENOMEM; | |
791 | ||
792 | l2cap_sock_init(sk, NULL); | |
793 | return 0; | |
794 | } | |
795 | ||
f29972de | 796 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
1da177e4 | 797 | { |
1da177e4 | 798 | struct sock *sk = sock->sk; |
f29972de MH |
799 | struct sockaddr_l2 la; |
800 | int len, err = 0; | |
1da177e4 | 801 | |
f29972de | 802 | BT_DBG("sk %p", sk); |
1da177e4 LT |
803 | |
804 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
805 | return -EINVAL; | |
806 | ||
f29972de MH |
807 | memset(&la, 0, sizeof(la)); |
808 | len = min_t(unsigned int, sizeof(la), alen); | |
809 | memcpy(&la, addr, len); | |
810 | ||
2a517ca6 MH |
811 | if (la.l2_cid) |
812 | return -EINVAL; | |
813 | ||
1da177e4 LT |
814 | lock_sock(sk); |
815 | ||
816 | if (sk->sk_state != BT_OPEN) { | |
817 | err = -EBADFD; | |
818 | goto done; | |
819 | } | |
820 | ||
b4324b5d | 821 | if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && |
847641d7 MH |
822 | !capable(CAP_NET_BIND_SERVICE)) { |
823 | err = -EACCES; | |
824 | goto done; | |
825 | } | |
8e87d142 | 826 | |
1da177e4 LT |
827 | write_lock_bh(&l2cap_sk_list.lock); |
828 | ||
f29972de | 829 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
1da177e4 LT |
830 | err = -EADDRINUSE; |
831 | } else { | |
832 | /* Save source address */ | |
f29972de MH |
833 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
834 | l2cap_pi(sk)->psm = la.l2_psm; | |
835 | l2cap_pi(sk)->sport = la.l2_psm; | |
1da177e4 | 836 | sk->sk_state = BT_BOUND; |
2af6b9d5 | 837 | |
b4324b5d MH |
838 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
839 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
2af6b9d5 | 840 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
1da177e4 LT |
841 | } |
842 | ||
843 | write_unlock_bh(&l2cap_sk_list.lock); | |
844 | ||
845 | done: | |
846 | release_sock(sk); | |
847 | return err; | |
848 | } | |
849 | ||
850 | static int l2cap_do_connect(struct sock *sk) | |
851 | { | |
852 | bdaddr_t *src = &bt_sk(sk)->src; | |
853 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
854 | struct l2cap_conn *conn; | |
855 | struct hci_conn *hcon; | |
856 | struct hci_dev *hdev; | |
09ab6f4c | 857 | __u8 auth_type; |
44d0e48e | 858 | int err; |
1da177e4 | 859 | |
f29972de MH |
860 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
861 | l2cap_pi(sk)->psm); | |
1da177e4 | 862 | |
af05b30b GP |
863 | hdev = hci_get_route(dst, src); |
864 | if (!hdev) | |
1da177e4 LT |
865 | return -EHOSTUNREACH; |
866 | ||
867 | hci_dev_lock_bh(hdev); | |
868 | ||
869 | err = -ENOMEM; | |
870 | ||
8c1b2355 | 871 | if (sk->sk_type == SOCK_RAW) { |
2af6b9d5 MH |
872 | switch (l2cap_pi(sk)->sec_level) { |
873 | case BT_SECURITY_HIGH: | |
8c1b2355 | 874 | auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
2af6b9d5 MH |
875 | break; |
876 | case BT_SECURITY_MEDIUM: | |
8c1b2355 | 877 | auth_type = HCI_AT_DEDICATED_BONDING; |
2af6b9d5 MH |
878 | break; |
879 | default: | |
09ab6f4c | 880 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
881 | break; |
882 | } | |
8c1b2355 | 883 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
2af6b9d5 | 884 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8c1b2355 | 885 | auth_type = HCI_AT_NO_BONDING_MITM; |
09ab6f4c | 886 | else |
8c1b2355 | 887 | auth_type = HCI_AT_NO_BONDING; |
435fef20 MH |
888 | |
889 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
890 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
8c1b2355 | 891 | } else { |
2af6b9d5 MH |
892 | switch (l2cap_pi(sk)->sec_level) { |
893 | case BT_SECURITY_HIGH: | |
8c1b2355 | 894 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
2af6b9d5 MH |
895 | break; |
896 | case BT_SECURITY_MEDIUM: | |
09ab6f4c | 897 | auth_type = HCI_AT_GENERAL_BONDING; |
2af6b9d5 MH |
898 | break; |
899 | default: | |
8c1b2355 | 900 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
901 | break; |
902 | } | |
09ab6f4c MH |
903 | } |
904 | ||
2af6b9d5 MH |
905 | hcon = hci_connect(hdev, ACL_LINK, dst, |
906 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
907 | if (!hcon) |
908 | goto done; | |
909 | ||
910 | conn = l2cap_conn_add(hcon, 0); | |
911 | if (!conn) { | |
912 | hci_conn_put(hcon); | |
913 | goto done; | |
914 | } | |
915 | ||
916 | err = 0; | |
917 | ||
918 | /* Update source addr of the socket */ | |
919 | bacpy(src, conn->src); | |
920 | ||
921 | l2cap_chan_add(conn, sk, NULL); | |
922 | ||
923 | sk->sk_state = BT_CONNECT; | |
924 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
925 | ||
926 | if (hcon->state == BT_CONNECTED) { | |
79d554a6 | 927 | if (sk->sk_type != SOCK_SEQPACKET) { |
1da177e4 LT |
928 | l2cap_sock_clear_timer(sk); |
929 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
930 | } else |
931 | l2cap_do_start(sk); | |
1da177e4 LT |
932 | } |
933 | ||
934 | done: | |
935 | hci_dev_unlock_bh(hdev); | |
936 | hci_dev_put(hdev); | |
937 | return err; | |
938 | } | |
939 | ||
940 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
941 | { | |
1da177e4 | 942 | struct sock *sk = sock->sk; |
f29972de MH |
943 | struct sockaddr_l2 la; |
944 | int len, err = 0; | |
1da177e4 | 945 | |
1da177e4 LT |
946 | BT_DBG("sk %p", sk); |
947 | ||
2a517ca6 MH |
948 | if (!addr || addr->sa_family != AF_BLUETOOTH) |
949 | return -EINVAL; | |
1da177e4 | 950 | |
f29972de MH |
951 | memset(&la, 0, sizeof(la)); |
952 | len = min_t(unsigned int, sizeof(la), alen); | |
953 | memcpy(&la, addr, len); | |
954 | ||
2a517ca6 MH |
955 | if (la.l2_cid) |
956 | return -EINVAL; | |
957 | ||
958 | lock_sock(sk); | |
959 | ||
f29972de | 960 | if (sk->sk_type == SOCK_SEQPACKET && !la.l2_psm) { |
1da177e4 LT |
961 | err = -EINVAL; |
962 | goto done; | |
963 | } | |
964 | ||
c6b03cf9 MH |
965 | switch (l2cap_pi(sk)->mode) { |
966 | case L2CAP_MODE_BASIC: | |
967 | break; | |
968 | case L2CAP_MODE_ERTM: | |
969 | if (enable_ertm) | |
970 | break; | |
971 | /* fall through */ | |
972 | default: | |
973 | err = -ENOTSUPP; | |
974 | goto done; | |
975 | } | |
976 | ||
af05b30b | 977 | switch (sk->sk_state) { |
1da177e4 LT |
978 | case BT_CONNECT: |
979 | case BT_CONNECT2: | |
980 | case BT_CONFIG: | |
981 | /* Already connecting */ | |
982 | goto wait; | |
983 | ||
984 | case BT_CONNECTED: | |
985 | /* Already connected */ | |
986 | goto done; | |
987 | ||
988 | case BT_OPEN: | |
989 | case BT_BOUND: | |
990 | /* Can connect */ | |
991 | break; | |
992 | ||
993 | default: | |
994 | err = -EBADFD; | |
995 | goto done; | |
996 | } | |
997 | ||
998 | /* Set destination address and psm */ | |
f29972de MH |
999 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1000 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 1001 | |
af05b30b GP |
1002 | err = l2cap_do_connect(sk); |
1003 | if (err) | |
1da177e4 LT |
1004 | goto done; |
1005 | ||
1006 | wait: | |
1007 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
1008 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
1009 | done: | |
1010 | release_sock(sk); | |
1011 | return err; | |
1012 | } | |
1013 | ||
1014 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
1015 | { | |
1016 | struct sock *sk = sock->sk; | |
1017 | int err = 0; | |
1018 | ||
1019 | BT_DBG("sk %p backlog %d", sk, backlog); | |
1020 | ||
1021 | lock_sock(sk); | |
1022 | ||
1023 | if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) { | |
1024 | err = -EBADFD; | |
1025 | goto done; | |
1026 | } | |
1027 | ||
c6b03cf9 MH |
1028 | switch (l2cap_pi(sk)->mode) { |
1029 | case L2CAP_MODE_BASIC: | |
1030 | break; | |
1031 | case L2CAP_MODE_ERTM: | |
1032 | if (enable_ertm) | |
1033 | break; | |
1034 | /* fall through */ | |
1035 | default: | |
1036 | err = -ENOTSUPP; | |
1037 | goto done; | |
1038 | } | |
1039 | ||
1da177e4 LT |
1040 | if (!l2cap_pi(sk)->psm) { |
1041 | bdaddr_t *src = &bt_sk(sk)->src; | |
1042 | u16 psm; | |
1043 | ||
1044 | err = -EINVAL; | |
1045 | ||
1046 | write_lock_bh(&l2cap_sk_list.lock); | |
1047 | ||
1048 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
b4324b5d MH |
1049 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1050 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
1051 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
1da177e4 LT |
1052 | err = 0; |
1053 | break; | |
1054 | } | |
1055 | ||
1056 | write_unlock_bh(&l2cap_sk_list.lock); | |
1057 | ||
1058 | if (err < 0) | |
1059 | goto done; | |
1060 | } | |
1061 | ||
1062 | sk->sk_max_ack_backlog = backlog; | |
1063 | sk->sk_ack_backlog = 0; | |
1064 | sk->sk_state = BT_LISTEN; | |
1065 | ||
1066 | done: | |
1067 | release_sock(sk); | |
1068 | return err; | |
1069 | } | |
1070 | ||
1071 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1072 | { | |
1073 | DECLARE_WAITQUEUE(wait, current); | |
1074 | struct sock *sk = sock->sk, *nsk; | |
1075 | long timeo; | |
1076 | int err = 0; | |
1077 | ||
fcc70d5f | 1078 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1079 | |
1080 | if (sk->sk_state != BT_LISTEN) { | |
1081 | err = -EBADFD; | |
1082 | goto done; | |
1083 | } | |
1084 | ||
1085 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1086 | ||
1087 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1088 | ||
1089 | /* Wait for an incoming connection. (wake-one). */ | |
1090 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
1091 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { | |
1092 | set_current_state(TASK_INTERRUPTIBLE); | |
1093 | if (!timeo) { | |
1094 | err = -EAGAIN; | |
1095 | break; | |
1096 | } | |
1097 | ||
1098 | release_sock(sk); | |
1099 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1100 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1101 | |
1102 | if (sk->sk_state != BT_LISTEN) { | |
1103 | err = -EBADFD; | |
1104 | break; | |
1105 | } | |
1106 | ||
1107 | if (signal_pending(current)) { | |
1108 | err = sock_intr_errno(timeo); | |
1109 | break; | |
1110 | } | |
1111 | } | |
1112 | set_current_state(TASK_RUNNING); | |
1113 | remove_wait_queue(sk->sk_sleep, &wait); | |
1114 | ||
1115 | if (err) | |
1116 | goto done; | |
1117 | ||
1118 | newsock->state = SS_CONNECTED; | |
1119 | ||
1120 | BT_DBG("new socket %p", nsk); | |
1121 | ||
1122 | done: | |
1123 | release_sock(sk); | |
1124 | return err; | |
1125 | } | |
1126 | ||
1127 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
1128 | { | |
1129 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1130 | struct sock *sk = sock->sk; | |
1131 | ||
1132 | BT_DBG("sock %p, sk %p", sock, sk); | |
1133 | ||
1134 | addr->sa_family = AF_BLUETOOTH; | |
1135 | *len = sizeof(struct sockaddr_l2); | |
1136 | ||
f29972de MH |
1137 | if (peer) { |
1138 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1139 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1140 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1141 | } else { |
1142 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1143 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1144 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1145 | } |
1da177e4 | 1146 | |
1da177e4 LT |
1147 | return 0; |
1148 | } | |
1149 | ||
1150 | static inline int l2cap_do_send(struct sock *sk, struct msghdr *msg, int len) | |
1151 | { | |
1152 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1153 | struct sk_buff *skb, **frag; | |
af05b30b | 1154 | int err, hlen, count, sent = 0; |
1da177e4 LT |
1155 | struct l2cap_hdr *lh; |
1156 | ||
1157 | BT_DBG("sk %p len %d", sk, len); | |
1158 | ||
1159 | /* First fragment (with L2CAP header) */ | |
1160 | if (sk->sk_type == SOCK_DGRAM) | |
1161 | hlen = L2CAP_HDR_SIZE + 2; | |
1162 | else | |
1163 | hlen = L2CAP_HDR_SIZE; | |
1164 | ||
1165 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1166 | ||
1167 | skb = bt_skb_send_alloc(sk, hlen + count, | |
1168 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1169 | if (!skb) | |
1170 | return err; | |
1171 | ||
1172 | /* Create L2CAP header */ | |
1173 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c YH |
1174 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
1175 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1da177e4 LT |
1176 | |
1177 | if (sk->sk_type == SOCK_DGRAM) | |
8e036fc3 | 1178 | put_unaligned(l2cap_pi(sk)->psm, (__le16 *) skb_put(skb, 2)); |
1da177e4 LT |
1179 | |
1180 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) { | |
1181 | err = -EFAULT; | |
1182 | goto fail; | |
1183 | } | |
1184 | ||
1185 | sent += count; | |
1186 | len -= count; | |
1187 | ||
1188 | /* Continuation fragments (no L2CAP header) */ | |
1189 | frag = &skb_shinfo(skb)->frag_list; | |
1190 | while (len) { | |
1191 | count = min_t(unsigned int, conn->mtu, len); | |
1192 | ||
1193 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1194 | if (!*frag) | |
1195 | goto fail; | |
8e87d142 | 1196 | |
1da177e4 LT |
1197 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) { |
1198 | err = -EFAULT; | |
1199 | goto fail; | |
1200 | } | |
1201 | ||
1202 | sent += count; | |
1203 | len -= count; | |
1204 | ||
1205 | frag = &(*frag)->next; | |
1206 | } | |
af05b30b GP |
1207 | err = hci_send_acl(conn->hcon, skb, 0); |
1208 | if (err < 0) | |
1da177e4 LT |
1209 | goto fail; |
1210 | ||
1211 | return sent; | |
1212 | ||
1213 | fail: | |
1214 | kfree_skb(skb); | |
1215 | return err; | |
1216 | } | |
1217 | ||
1218 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) | |
1219 | { | |
1220 | struct sock *sk = sock->sk; | |
1221 | int err = 0; | |
1222 | ||
1223 | BT_DBG("sock %p, sk %p", sock, sk); | |
1224 | ||
c1cbe4b7 BL |
1225 | err = sock_error(sk); |
1226 | if (err) | |
1227 | return err; | |
1da177e4 LT |
1228 | |
1229 | if (msg->msg_flags & MSG_OOB) | |
1230 | return -EOPNOTSUPP; | |
1231 | ||
1232 | /* Check outgoing MTU */ | |
1233 | if (sk->sk_type != SOCK_RAW && len > l2cap_pi(sk)->omtu) | |
1234 | return -EINVAL; | |
1235 | ||
1236 | lock_sock(sk); | |
1237 | ||
1238 | if (sk->sk_state == BT_CONNECTED) | |
1239 | err = l2cap_do_send(sk, msg, len); | |
1240 | else | |
1241 | err = -ENOTCONN; | |
1242 | ||
1243 | release_sock(sk); | |
1244 | return err; | |
1245 | } | |
1246 | ||
f66dc81f MH |
1247 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1248 | { | |
1249 | struct sock *sk = sock->sk; | |
1250 | ||
1251 | lock_sock(sk); | |
1252 | ||
1253 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1254 | struct l2cap_conn_rsp rsp; | |
1255 | ||
1256 | sk->sk_state = BT_CONFIG; | |
1257 | ||
1258 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1259 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1260 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1261 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1262 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1263 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1264 | ||
1265 | release_sock(sk); | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | release_sock(sk); | |
1270 | ||
1271 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); | |
1272 | } | |
1273 | ||
d58daf42 | 1274 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, int optlen) |
1da177e4 LT |
1275 | { |
1276 | struct sock *sk = sock->sk; | |
1277 | struct l2cap_options opts; | |
f29972de | 1278 | int len, err = 0; |
1da177e4 LT |
1279 | u32 opt; |
1280 | ||
1281 | BT_DBG("sk %p", sk); | |
1282 | ||
1283 | lock_sock(sk); | |
1284 | ||
1285 | switch (optname) { | |
1286 | case L2CAP_OPTIONS: | |
0878b666 MH |
1287 | opts.imtu = l2cap_pi(sk)->imtu; |
1288 | opts.omtu = l2cap_pi(sk)->omtu; | |
1289 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1290 | opts.mode = l2cap_pi(sk)->mode; |
0878b666 | 1291 | |
1da177e4 LT |
1292 | len = min_t(unsigned int, sizeof(opts), optlen); |
1293 | if (copy_from_user((char *) &opts, optval, len)) { | |
1294 | err = -EFAULT; | |
1295 | break; | |
1296 | } | |
0878b666 | 1297 | |
c6b03cf9 MH |
1298 | l2cap_pi(sk)->imtu = opts.imtu; |
1299 | l2cap_pi(sk)->omtu = opts.omtu; | |
1300 | l2cap_pi(sk)->mode = opts.mode; | |
1da177e4 LT |
1301 | break; |
1302 | ||
1303 | case L2CAP_LM: | |
1304 | if (get_user(opt, (u32 __user *) optval)) { | |
1305 | err = -EFAULT; | |
1306 | break; | |
1307 | } | |
1308 | ||
2af6b9d5 MH |
1309 | if (opt & L2CAP_LM_AUTH) |
1310 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
1311 | if (opt & L2CAP_LM_ENCRYPT) | |
1312 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
1313 | if (opt & L2CAP_LM_SECURE) | |
1314 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
1315 | ||
1316 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
1317 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
1318 | break; |
1319 | ||
1320 | default: | |
1321 | err = -ENOPROTOOPT; | |
1322 | break; | |
1323 | } | |
1324 | ||
1325 | release_sock(sk); | |
1326 | return err; | |
1327 | } | |
1328 | ||
d58daf42 MH |
1329 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) |
1330 | { | |
1331 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
1332 | struct bt_security sec; |
1333 | int len, err = 0; | |
f66dc81f | 1334 | u32 opt; |
d58daf42 MH |
1335 | |
1336 | BT_DBG("sk %p", sk); | |
1337 | ||
1338 | if (level == SOL_L2CAP) | |
1339 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
1340 | ||
0588d94f MH |
1341 | if (level != SOL_BLUETOOTH) |
1342 | return -ENOPROTOOPT; | |
1343 | ||
d58daf42 MH |
1344 | lock_sock(sk); |
1345 | ||
1346 | switch (optname) { | |
2af6b9d5 | 1347 | case BT_SECURITY: |
2526d3d8 | 1348 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) { |
0588d94f MH |
1349 | err = -EINVAL; |
1350 | break; | |
1351 | } | |
1352 | ||
2af6b9d5 MH |
1353 | sec.level = BT_SECURITY_LOW; |
1354 | ||
1355 | len = min_t(unsigned int, sizeof(sec), optlen); | |
1356 | if (copy_from_user((char *) &sec, optval, len)) { | |
1357 | err = -EFAULT; | |
1358 | break; | |
1359 | } | |
1360 | ||
1361 | if (sec.level < BT_SECURITY_LOW || | |
1362 | sec.level > BT_SECURITY_HIGH) { | |
1363 | err = -EINVAL; | |
1364 | break; | |
1365 | } | |
1366 | ||
1367 | l2cap_pi(sk)->sec_level = sec.level; | |
1368 | break; | |
1369 | ||
f66dc81f MH |
1370 | case BT_DEFER_SETUP: |
1371 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
1372 | err = -EINVAL; | |
1373 | break; | |
1374 | } | |
1375 | ||
1376 | if (get_user(opt, (u32 __user *) optval)) { | |
1377 | err = -EFAULT; | |
1378 | break; | |
1379 | } | |
1380 | ||
1381 | bt_sk(sk)->defer_setup = opt; | |
1382 | break; | |
1383 | ||
d58daf42 MH |
1384 | default: |
1385 | err = -ENOPROTOOPT; | |
1386 | break; | |
1387 | } | |
1388 | ||
1389 | release_sock(sk); | |
1390 | return err; | |
1391 | } | |
1392 | ||
1393 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
1394 | { |
1395 | struct sock *sk = sock->sk; | |
1396 | struct l2cap_options opts; | |
1397 | struct l2cap_conninfo cinfo; | |
1398 | int len, err = 0; | |
2af6b9d5 | 1399 | u32 opt; |
1da177e4 LT |
1400 | |
1401 | BT_DBG("sk %p", sk); | |
1402 | ||
1403 | if (get_user(len, optlen)) | |
1404 | return -EFAULT; | |
1405 | ||
1406 | lock_sock(sk); | |
1407 | ||
1408 | switch (optname) { | |
1409 | case L2CAP_OPTIONS: | |
1410 | opts.imtu = l2cap_pi(sk)->imtu; | |
1411 | opts.omtu = l2cap_pi(sk)->omtu; | |
1412 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1413 | opts.mode = l2cap_pi(sk)->mode; |
1da177e4 LT |
1414 | |
1415 | len = min_t(unsigned int, len, sizeof(opts)); | |
1416 | if (copy_to_user(optval, (char *) &opts, len)) | |
1417 | err = -EFAULT; | |
1418 | ||
1419 | break; | |
1420 | ||
1421 | case L2CAP_LM: | |
2af6b9d5 MH |
1422 | switch (l2cap_pi(sk)->sec_level) { |
1423 | case BT_SECURITY_LOW: | |
1424 | opt = L2CAP_LM_AUTH; | |
1425 | break; | |
1426 | case BT_SECURITY_MEDIUM: | |
1427 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
1428 | break; | |
1429 | case BT_SECURITY_HIGH: | |
1430 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
1431 | L2CAP_LM_SECURE; | |
1432 | break; | |
1433 | default: | |
1434 | opt = 0; | |
1435 | break; | |
1436 | } | |
1437 | ||
1438 | if (l2cap_pi(sk)->role_switch) | |
1439 | opt |= L2CAP_LM_MASTER; | |
1440 | ||
1441 | if (l2cap_pi(sk)->force_reliable) | |
1442 | opt |= L2CAP_LM_RELIABLE; | |
1443 | ||
1444 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
1445 | err = -EFAULT; |
1446 | break; | |
1447 | ||
1448 | case L2CAP_CONNINFO: | |
f66dc81f MH |
1449 | if (sk->sk_state != BT_CONNECTED && |
1450 | !(sk->sk_state == BT_CONNECT2 && | |
1451 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
1452 | err = -ENOTCONN; |
1453 | break; | |
1454 | } | |
1455 | ||
1456 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
1457 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
1458 | ||
1459 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
1460 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
1461 | err = -EFAULT; | |
1462 | ||
1463 | break; | |
1464 | ||
1465 | default: | |
1466 | err = -ENOPROTOOPT; | |
1467 | break; | |
1468 | } | |
1469 | ||
1470 | release_sock(sk); | |
1471 | return err; | |
1472 | } | |
1473 | ||
d58daf42 MH |
1474 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
1475 | { | |
1476 | struct sock *sk = sock->sk; | |
2af6b9d5 | 1477 | struct bt_security sec; |
d58daf42 MH |
1478 | int len, err = 0; |
1479 | ||
1480 | BT_DBG("sk %p", sk); | |
1481 | ||
1482 | if (level == SOL_L2CAP) | |
1483 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
1484 | ||
0588d94f MH |
1485 | if (level != SOL_BLUETOOTH) |
1486 | return -ENOPROTOOPT; | |
1487 | ||
d58daf42 MH |
1488 | if (get_user(len, optlen)) |
1489 | return -EFAULT; | |
1490 | ||
1491 | lock_sock(sk); | |
1492 | ||
1493 | switch (optname) { | |
2af6b9d5 | 1494 | case BT_SECURITY: |
2526d3d8 | 1495 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) { |
0588d94f MH |
1496 | err = -EINVAL; |
1497 | break; | |
1498 | } | |
1499 | ||
2af6b9d5 MH |
1500 | sec.level = l2cap_pi(sk)->sec_level; |
1501 | ||
1502 | len = min_t(unsigned int, len, sizeof(sec)); | |
1503 | if (copy_to_user(optval, (char *) &sec, len)) | |
1504 | err = -EFAULT; | |
1505 | ||
1506 | break; | |
1507 | ||
f66dc81f MH |
1508 | case BT_DEFER_SETUP: |
1509 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
1510 | err = -EINVAL; | |
1511 | break; | |
1512 | } | |
1513 | ||
1514 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
1515 | err = -EFAULT; | |
1516 | ||
1517 | break; | |
1518 | ||
d58daf42 MH |
1519 | default: |
1520 | err = -ENOPROTOOPT; | |
1521 | break; | |
1522 | } | |
1523 | ||
1524 | release_sock(sk); | |
1525 | return err; | |
1526 | } | |
1527 | ||
1da177e4 LT |
1528 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
1529 | { | |
1530 | struct sock *sk = sock->sk; | |
1531 | int err = 0; | |
1532 | ||
1533 | BT_DBG("sock %p, sk %p", sock, sk); | |
1534 | ||
1535 | if (!sk) | |
1536 | return 0; | |
1537 | ||
1538 | lock_sock(sk); | |
1539 | if (!sk->sk_shutdown) { | |
1540 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1541 | l2cap_sock_clear_timer(sk); | |
1542 | __l2cap_sock_close(sk, 0); | |
1543 | ||
1544 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
1545 | err = bt_sock_wait_state(sk, BT_CLOSED, |
1546 | sk->sk_lingertime); | |
1da177e4 LT |
1547 | } |
1548 | release_sock(sk); | |
1549 | return err; | |
1550 | } | |
1551 | ||
1552 | static int l2cap_sock_release(struct socket *sock) | |
1553 | { | |
1554 | struct sock *sk = sock->sk; | |
1555 | int err; | |
1556 | ||
1557 | BT_DBG("sock %p, sk %p", sock, sk); | |
1558 | ||
1559 | if (!sk) | |
1560 | return 0; | |
1561 | ||
1562 | err = l2cap_sock_shutdown(sock, 2); | |
1563 | ||
1564 | sock_orphan(sk); | |
1565 | l2cap_sock_kill(sk); | |
1566 | return err; | |
1567 | } | |
1568 | ||
1da177e4 LT |
1569 | static void l2cap_chan_ready(struct sock *sk) |
1570 | { | |
1571 | struct sock *parent = bt_sk(sk)->parent; | |
1572 | ||
1573 | BT_DBG("sk %p, parent %p", sk, parent); | |
1574 | ||
1575 | l2cap_pi(sk)->conf_state = 0; | |
1576 | l2cap_sock_clear_timer(sk); | |
1577 | ||
1578 | if (!parent) { | |
1579 | /* Outgoing channel. | |
1580 | * Wake up socket sleeping on connect. | |
1581 | */ | |
1582 | sk->sk_state = BT_CONNECTED; | |
1583 | sk->sk_state_change(sk); | |
1584 | } else { | |
1585 | /* Incoming channel. | |
1586 | * Wake up socket sleeping on accept. | |
1587 | */ | |
1588 | parent->sk_data_ready(parent, 0); | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | /* Copy frame to all raw sockets on that connection */ | |
1593 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1594 | { | |
1595 | struct l2cap_chan_list *l = &conn->chan_list; | |
1596 | struct sk_buff *nskb; | |
af05b30b | 1597 | struct sock *sk; |
1da177e4 LT |
1598 | |
1599 | BT_DBG("conn %p", conn); | |
1600 | ||
1601 | read_lock(&l->lock); | |
1602 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
1603 | if (sk->sk_type != SOCK_RAW) | |
1604 | continue; | |
1605 | ||
1606 | /* Don't send frame to the socket it came from */ | |
1607 | if (skb->sk == sk) | |
1608 | continue; | |
af05b30b GP |
1609 | nskb = skb_clone(skb, GFP_ATOMIC); |
1610 | if (!nskb) | |
1da177e4 LT |
1611 | continue; |
1612 | ||
1613 | if (sock_queue_rcv_skb(sk, nskb)) | |
1614 | kfree_skb(nskb); | |
1615 | } | |
1616 | read_unlock(&l->lock); | |
1617 | } | |
1618 | ||
1619 | /* ---- L2CAP signalling commands ---- */ | |
1620 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1621 | u8 code, u8 ident, u16 dlen, void *data) | |
1622 | { | |
1623 | struct sk_buff *skb, **frag; | |
1624 | struct l2cap_cmd_hdr *cmd; | |
1625 | struct l2cap_hdr *lh; | |
1626 | int len, count; | |
1627 | ||
af05b30b GP |
1628 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1629 | conn, code, ident, dlen); | |
1da177e4 LT |
1630 | |
1631 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1632 | count = min_t(unsigned int, conn->mtu, len); | |
1633 | ||
1634 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1635 | if (!skb) | |
1636 | return NULL; | |
1637 | ||
1638 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1639 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 1640 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
1641 | |
1642 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1643 | cmd->code = code; | |
1644 | cmd->ident = ident; | |
aca3192c | 1645 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1646 | |
1647 | if (dlen) { | |
1648 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1649 | memcpy(skb_put(skb, count), data, count); | |
1650 | data += count; | |
1651 | } | |
1652 | ||
1653 | len -= skb->len; | |
1654 | ||
1655 | /* Continuation fragments (no L2CAP header) */ | |
1656 | frag = &skb_shinfo(skb)->frag_list; | |
1657 | while (len) { | |
1658 | count = min_t(unsigned int, conn->mtu, len); | |
1659 | ||
1660 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1661 | if (!*frag) | |
1662 | goto fail; | |
1663 | ||
1664 | memcpy(skb_put(*frag, count), data, count); | |
1665 | ||
1666 | len -= count; | |
1667 | data += count; | |
1668 | ||
1669 | frag = &(*frag)->next; | |
1670 | } | |
1671 | ||
1672 | return skb; | |
1673 | ||
1674 | fail: | |
1675 | kfree_skb(skb); | |
1676 | return NULL; | |
1677 | } | |
1678 | ||
1679 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1680 | { | |
1681 | struct l2cap_conf_opt *opt = *ptr; | |
1682 | int len; | |
1683 | ||
1684 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1685 | *ptr += len; | |
1686 | ||
1687 | *type = opt->type; | |
1688 | *olen = opt->len; | |
1689 | ||
1690 | switch (opt->len) { | |
1691 | case 1: | |
1692 | *val = *((u8 *) opt->val); | |
1693 | break; | |
1694 | ||
1695 | case 2: | |
861d6882 | 1696 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
1697 | break; |
1698 | ||
1699 | case 4: | |
861d6882 | 1700 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
1701 | break; |
1702 | ||
1703 | default: | |
1704 | *val = (unsigned long) opt->val; | |
1705 | break; | |
1706 | } | |
1707 | ||
1708 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1709 | return len; | |
1710 | } | |
1711 | ||
1da177e4 LT |
1712 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1713 | { | |
1714 | struct l2cap_conf_opt *opt = *ptr; | |
1715 | ||
1716 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1717 | ||
1718 | opt->type = type; | |
1719 | opt->len = len; | |
1720 | ||
1721 | switch (len) { | |
1722 | case 1: | |
1723 | *((u8 *) opt->val) = val; | |
1724 | break; | |
1725 | ||
1726 | case 2: | |
8e036fc3 | 1727 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
1728 | break; |
1729 | ||
1730 | case 4: | |
8e036fc3 | 1731 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
1732 | break; |
1733 | ||
1734 | default: | |
1735 | memcpy(opt->val, (void *) val, len); | |
1736 | break; | |
1737 | } | |
1738 | ||
1739 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1740 | } | |
1741 | ||
1742 | static int l2cap_build_conf_req(struct sock *sk, void *data) | |
1743 | { | |
1744 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1745 | struct l2cap_conf_req *req = data; | |
65c7c491 | 1746 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
1da177e4 LT |
1747 | void *ptr = req->data; |
1748 | ||
1749 | BT_DBG("sk %p", sk); | |
1750 | ||
65c7c491 MH |
1751 | switch (pi->mode) { |
1752 | case L2CAP_MODE_BASIC: | |
1753 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
1754 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1755 | break; | |
1756 | ||
1757 | case L2CAP_MODE_ERTM: | |
1758 | rfc.mode = L2CAP_MODE_ERTM; | |
1759 | rfc.txwin_size = L2CAP_DEFAULT_RX_WINDOW; | |
1760 | rfc.max_transmit = L2CAP_DEFAULT_MAX_RECEIVE; | |
1761 | rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO); | |
1762 | rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO); | |
1763 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_RX_APDU); | |
1764 | ||
1765 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1766 | sizeof(rfc), (unsigned long) &rfc); | |
1767 | break; | |
1768 | } | |
1da177e4 LT |
1769 | |
1770 | /* FIXME: Need actual value of the flush timeout */ | |
1771 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
1772 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
1773 | ||
aca3192c YH |
1774 | req->dcid = cpu_to_le16(pi->dcid); |
1775 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1776 | |
1777 | return ptr - data; | |
1778 | } | |
1779 | ||
5dee9e7c | 1780 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1781 | { |
1782 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
1783 | struct l2cap_conf_rsp *rsp = data; |
1784 | void *ptr = rsp->data; | |
1785 | void *req = pi->conf_req; | |
1786 | int len = pi->conf_len; | |
1787 | int type, hint, olen; | |
1788 | unsigned long val; | |
6464f35f | 1789 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1790 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1791 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1792 | |
5dee9e7c | 1793 | BT_DBG("sk %p", sk); |
820ae1b8 | 1794 | |
5dee9e7c MH |
1795 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1796 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1797 | |
589d2746 | 1798 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1799 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1800 | |
1801 | switch (type) { | |
1802 | case L2CAP_CONF_MTU: | |
861d6882 | 1803 | mtu = val; |
5dee9e7c MH |
1804 | break; |
1805 | ||
1806 | case L2CAP_CONF_FLUSH_TO: | |
1807 | pi->flush_to = val; | |
1808 | break; | |
1809 | ||
1810 | case L2CAP_CONF_QOS: | |
1811 | break; | |
1812 | ||
6464f35f MH |
1813 | case L2CAP_CONF_RFC: |
1814 | if (olen == sizeof(rfc)) | |
1815 | memcpy(&rfc, (void *) val, olen); | |
1816 | break; | |
1817 | ||
5dee9e7c MH |
1818 | default: |
1819 | if (hint) | |
1820 | break; | |
1821 | ||
1822 | result = L2CAP_CONF_UNKNOWN; | |
1823 | *((u8 *) ptr++) = type; | |
1824 | break; | |
1825 | } | |
1826 | } | |
1827 | ||
1828 | if (result == L2CAP_CONF_SUCCESS) { | |
1829 | /* Configure output options and let the other side know | |
1830 | * which ones we don't like. */ | |
1831 | ||
6464f35f MH |
1832 | if (rfc.mode == L2CAP_MODE_BASIC) { |
1833 | if (mtu < pi->omtu) | |
1834 | result = L2CAP_CONF_UNACCEPT; | |
1835 | else { | |
1836 | pi->omtu = mtu; | |
1837 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1838 | } | |
1839 | ||
1840 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
1841 | } else { | |
5dee9e7c | 1842 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1843 | |
6464f35f MH |
1844 | memset(&rfc, 0, sizeof(rfc)); |
1845 | rfc.mode = L2CAP_MODE_BASIC; | |
1846 | ||
1847 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
65c7c491 | 1848 | sizeof(rfc), (unsigned long) &rfc); |
6464f35f | 1849 | } |
5dee9e7c MH |
1850 | } |
1851 | ||
1852 | rsp->scid = cpu_to_le16(pi->dcid); | |
1853 | rsp->result = cpu_to_le16(result); | |
1854 | rsp->flags = cpu_to_le16(0x0000); | |
1855 | ||
1856 | return ptr - data; | |
1da177e4 LT |
1857 | } |
1858 | ||
5dee9e7c | 1859 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1860 | { |
1861 | struct l2cap_conf_rsp *rsp = data; | |
1862 | void *ptr = rsp->data; | |
1da177e4 | 1863 | |
5dee9e7c | 1864 | BT_DBG("sk %p", sk); |
1da177e4 | 1865 | |
aca3192c | 1866 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1867 | rsp->result = cpu_to_le16(result); |
aca3192c | 1868 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1869 | |
1870 | return ptr - data; | |
1871 | } | |
1872 | ||
4e8402a3 MH |
1873 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1874 | { | |
1875 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
1876 | ||
1877 | if (rej->reason != 0x0000) | |
1878 | return 0; | |
1879 | ||
1880 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
1881 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 1882 | del_timer(&conn->info_timer); |
984947dc MH |
1883 | |
1884 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 1885 | conn->info_ident = 0; |
984947dc | 1886 | |
4e8402a3 MH |
1887 | l2cap_conn_start(conn); |
1888 | } | |
1889 | ||
1890 | return 0; | |
1891 | } | |
1892 | ||
1da177e4 LT |
1893 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1894 | { | |
1895 | struct l2cap_chan_list *list = &conn->chan_list; | |
1896 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
1897 | struct l2cap_conn_rsp rsp; | |
1898 | struct sock *sk, *parent; | |
e7c29cb1 | 1899 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
1900 | |
1901 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 1902 | __le16 psm = req->psm; |
1da177e4 LT |
1903 | |
1904 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
1905 | ||
1906 | /* Check if we have socket listening on psm */ | |
1907 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
1908 | if (!parent) { | |
1909 | result = L2CAP_CR_BAD_PSM; | |
1910 | goto sendresp; | |
1911 | } | |
1912 | ||
e7c29cb1 MH |
1913 | /* Check if the ACL is secure enough (if not SDP) */ |
1914 | if (psm != cpu_to_le16(0x0001) && | |
1915 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 1916 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
1917 | result = L2CAP_CR_SEC_BLOCK; |
1918 | goto response; | |
1919 | } | |
1920 | ||
1da177e4 LT |
1921 | result = L2CAP_CR_NO_MEM; |
1922 | ||
1923 | /* Check for backlog size */ | |
1924 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 1925 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
1926 | goto response; |
1927 | } | |
1928 | ||
3b1e0a65 | 1929 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
1930 | if (!sk) |
1931 | goto response; | |
1932 | ||
fd1278d7 | 1933 | write_lock_bh(&list->lock); |
1da177e4 LT |
1934 | |
1935 | /* Check if we already have channel with that dcid */ | |
1936 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 1937 | write_unlock_bh(&list->lock); |
1da177e4 LT |
1938 | sock_set_flag(sk, SOCK_ZAPPED); |
1939 | l2cap_sock_kill(sk); | |
1940 | goto response; | |
1941 | } | |
1942 | ||
1943 | hci_conn_hold(conn->hcon); | |
1944 | ||
1945 | l2cap_sock_init(sk, parent); | |
1946 | bacpy(&bt_sk(sk)->src, conn->src); | |
1947 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
1948 | l2cap_pi(sk)->psm = psm; | |
1949 | l2cap_pi(sk)->dcid = scid; | |
1950 | ||
1951 | __l2cap_chan_add(conn, sk, parent); | |
1952 | dcid = l2cap_pi(sk)->scid; | |
1953 | ||
1954 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1955 | ||
1da177e4 LT |
1956 | l2cap_pi(sk)->ident = cmd->ident; |
1957 | ||
984947dc | 1958 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 1959 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
1960 | if (bt_sk(sk)->defer_setup) { |
1961 | sk->sk_state = BT_CONNECT2; | |
1962 | result = L2CAP_CR_PEND; | |
1963 | status = L2CAP_CS_AUTHOR_PEND; | |
1964 | parent->sk_data_ready(parent, 0); | |
1965 | } else { | |
1966 | sk->sk_state = BT_CONFIG; | |
1967 | result = L2CAP_CR_SUCCESS; | |
1968 | status = L2CAP_CS_NO_INFO; | |
1969 | } | |
79d554a6 MH |
1970 | } else { |
1971 | sk->sk_state = BT_CONNECT2; | |
1972 | result = L2CAP_CR_PEND; | |
1973 | status = L2CAP_CS_AUTHEN_PEND; | |
1974 | } | |
1975 | } else { | |
1976 | sk->sk_state = BT_CONNECT2; | |
1977 | result = L2CAP_CR_PEND; | |
1978 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
1979 | } |
1980 | ||
fd1278d7 | 1981 | write_unlock_bh(&list->lock); |
1da177e4 LT |
1982 | |
1983 | response: | |
1984 | bh_unlock_sock(parent); | |
1985 | ||
1986 | sendresp: | |
aca3192c YH |
1987 | rsp.scid = cpu_to_le16(scid); |
1988 | rsp.dcid = cpu_to_le16(dcid); | |
1989 | rsp.result = cpu_to_le16(result); | |
1990 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 1991 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
1992 | |
1993 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
1994 | struct l2cap_info_req info; | |
1995 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
1996 | ||
1997 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
1998 | conn->info_ident = l2cap_get_ident(conn); | |
1999 | ||
2000 | mod_timer(&conn->info_timer, jiffies + | |
2001 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2002 | ||
2003 | l2cap_send_cmd(conn, conn->info_ident, | |
2004 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2005 | } | |
2006 | ||
1da177e4 LT |
2007 | return 0; |
2008 | } | |
2009 | ||
2010 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2011 | { | |
2012 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2013 | u16 scid, dcid, result, status; | |
2014 | struct sock *sk; | |
2015 | u8 req[128]; | |
2016 | ||
2017 | scid = __le16_to_cpu(rsp->scid); | |
2018 | dcid = __le16_to_cpu(rsp->dcid); | |
2019 | result = __le16_to_cpu(rsp->result); | |
2020 | status = __le16_to_cpu(rsp->status); | |
2021 | ||
2022 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2023 | ||
2024 | if (scid) { | |
af05b30b GP |
2025 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2026 | if (!sk) | |
1da177e4 LT |
2027 | return 0; |
2028 | } else { | |
af05b30b GP |
2029 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2030 | if (!sk) | |
1da177e4 LT |
2031 | return 0; |
2032 | } | |
2033 | ||
2034 | switch (result) { | |
2035 | case L2CAP_CR_SUCCESS: | |
2036 | sk->sk_state = BT_CONFIG; | |
2037 | l2cap_pi(sk)->ident = 0; | |
2038 | l2cap_pi(sk)->dcid = dcid; | |
2039 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2040 | ||
6a8d3010 MH |
2041 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2042 | ||
1da177e4 LT |
2043 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2044 | l2cap_build_conf_req(sk, req), req); | |
2045 | break; | |
2046 | ||
2047 | case L2CAP_CR_PEND: | |
6a8d3010 | 2048 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2049 | break; |
2050 | ||
2051 | default: | |
2052 | l2cap_chan_del(sk, ECONNREFUSED); | |
2053 | break; | |
2054 | } | |
2055 | ||
2056 | bh_unlock_sock(sk); | |
2057 | return 0; | |
2058 | } | |
2059 | ||
88219a0f | 2060 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2061 | { |
2062 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2063 | u16 dcid, flags; | |
2064 | u8 rsp[64]; | |
2065 | struct sock *sk; | |
5dee9e7c | 2066 | int len; |
1da177e4 LT |
2067 | |
2068 | dcid = __le16_to_cpu(req->dcid); | |
2069 | flags = __le16_to_cpu(req->flags); | |
2070 | ||
2071 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2072 | ||
af05b30b GP |
2073 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2074 | if (!sk) | |
1da177e4 LT |
2075 | return -ENOENT; |
2076 | ||
354f60a9 MH |
2077 | if (sk->sk_state == BT_DISCONN) |
2078 | goto unlock; | |
2079 | ||
5dee9e7c | 2080 | /* Reject if config buffer is too small. */ |
88219a0f | 2081 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2082 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2083 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2084 | l2cap_build_conf_rsp(sk, rsp, | |
2085 | L2CAP_CONF_REJECT, flags), rsp); | |
2086 | goto unlock; | |
2087 | } | |
2088 | ||
2089 | /* Store config. */ | |
2090 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2091 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2092 | |
2093 | if (flags & 0x0001) { | |
2094 | /* Incomplete config. Send empty response. */ | |
2095 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2096 | l2cap_build_conf_rsp(sk, rsp, |
2097 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2098 | goto unlock; |
2099 | } | |
2100 | ||
2101 | /* Complete config. */ | |
5dee9e7c MH |
2102 | len = l2cap_parse_conf_req(sk, rsp); |
2103 | if (len < 0) | |
1da177e4 LT |
2104 | goto unlock; |
2105 | ||
5dee9e7c MH |
2106 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
2107 | ||
5dee9e7c MH |
2108 | /* Reset config buffer. */ |
2109 | l2cap_pi(sk)->conf_len = 0; | |
2110 | ||
876d9484 MH |
2111 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2112 | goto unlock; | |
2113 | ||
1da177e4 LT |
2114 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
2115 | sk->sk_state = BT_CONNECTED; | |
2116 | l2cap_chan_ready(sk); | |
876d9484 MH |
2117 | goto unlock; |
2118 | } | |
2119 | ||
2120 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2121 | u8 buf[64]; |
1da177e4 | 2122 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 2123 | l2cap_build_conf_req(sk, buf), buf); |
1da177e4 LT |
2124 | } |
2125 | ||
2126 | unlock: | |
2127 | bh_unlock_sock(sk); | |
2128 | return 0; | |
2129 | } | |
2130 | ||
2131 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2132 | { | |
2133 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2134 | u16 scid, flags, result; | |
2135 | struct sock *sk; | |
2136 | ||
2137 | scid = __le16_to_cpu(rsp->scid); | |
2138 | flags = __le16_to_cpu(rsp->flags); | |
2139 | result = __le16_to_cpu(rsp->result); | |
2140 | ||
af05b30b GP |
2141 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2142 | scid, flags, result); | |
1da177e4 | 2143 | |
af05b30b GP |
2144 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2145 | if (!sk) | |
1da177e4 LT |
2146 | return 0; |
2147 | ||
2148 | switch (result) { | |
2149 | case L2CAP_CONF_SUCCESS: | |
2150 | break; | |
2151 | ||
2152 | case L2CAP_CONF_UNACCEPT: | |
2153 | if (++l2cap_pi(sk)->conf_retry < L2CAP_CONF_MAX_RETRIES) { | |
2154 | char req[128]; | |
2155 | /* It does not make sense to adjust L2CAP parameters | |
2156 | * that are currently defined in the spec. We simply | |
2157 | * resend config request that we sent earlier. It is | |
2158 | * stupid, but it helps qualification testing which | |
2159 | * expects at least some response from us. */ | |
2160 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
2161 | l2cap_build_conf_req(sk, req), req); | |
2162 | goto done; | |
2163 | } | |
2164 | ||
8e87d142 | 2165 | default: |
1da177e4 | 2166 | sk->sk_state = BT_DISCONN; |
b1235d79 | 2167 | sk->sk_err = ECONNRESET; |
1da177e4 LT |
2168 | l2cap_sock_set_timer(sk, HZ * 5); |
2169 | { | |
2170 | struct l2cap_disconn_req req; | |
aca3192c YH |
2171 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
2172 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1da177e4 LT |
2173 | l2cap_send_cmd(conn, l2cap_get_ident(conn), |
2174 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
2175 | } | |
2176 | goto done; | |
2177 | } | |
2178 | ||
2179 | if (flags & 0x01) | |
2180 | goto done; | |
2181 | ||
1da177e4 LT |
2182 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2183 | ||
2184 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
2185 | sk->sk_state = BT_CONNECTED; | |
2186 | l2cap_chan_ready(sk); | |
2187 | } | |
2188 | ||
2189 | done: | |
2190 | bh_unlock_sock(sk); | |
2191 | return 0; | |
2192 | } | |
2193 | ||
2194 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2195 | { | |
2196 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2197 | struct l2cap_disconn_rsp rsp; | |
2198 | u16 dcid, scid; | |
2199 | struct sock *sk; | |
2200 | ||
2201 | scid = __le16_to_cpu(req->scid); | |
2202 | dcid = __le16_to_cpu(req->dcid); | |
2203 | ||
2204 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2205 | ||
af05b30b GP |
2206 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2207 | if (!sk) | |
1da177e4 LT |
2208 | return 0; |
2209 | ||
aca3192c YH |
2210 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2211 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
2212 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2213 | ||
2214 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2215 | ||
2216 | l2cap_chan_del(sk, ECONNRESET); | |
2217 | bh_unlock_sock(sk); | |
2218 | ||
2219 | l2cap_sock_kill(sk); | |
2220 | return 0; | |
2221 | } | |
2222 | ||
2223 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2224 | { | |
2225 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2226 | u16 dcid, scid; | |
2227 | struct sock *sk; | |
2228 | ||
2229 | scid = __le16_to_cpu(rsp->scid); | |
2230 | dcid = __le16_to_cpu(rsp->dcid); | |
2231 | ||
2232 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2233 | ||
af05b30b GP |
2234 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2235 | if (!sk) | |
1da177e4 LT |
2236 | return 0; |
2237 | ||
2238 | l2cap_chan_del(sk, 0); | |
2239 | bh_unlock_sock(sk); | |
2240 | ||
2241 | l2cap_sock_kill(sk); | |
2242 | return 0; | |
2243 | } | |
2244 | ||
2245 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2246 | { | |
2247 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2248 | u16 type; |
2249 | ||
2250 | type = __le16_to_cpu(req->type); | |
2251 | ||
2252 | BT_DBG("type 0x%4.4x", type); | |
2253 | ||
f0709e03 MH |
2254 | if (type == L2CAP_IT_FEAT_MASK) { |
2255 | u8 buf[8]; | |
44dd46de | 2256 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2257 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2258 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2259 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
44dd46de MH |
2260 | if (enable_ertm) |
2261 | feat_mask |= L2CAP_FEAT_ERTM; | |
2262 | put_unaligned(cpu_to_le32(feat_mask), (__le32 *) rsp->data); | |
f0709e03 MH |
2263 | l2cap_send_cmd(conn, cmd->ident, |
2264 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2265 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2266 | u8 buf[12]; | |
2267 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2268 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2269 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2270 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2271 | l2cap_send_cmd(conn, cmd->ident, | |
2272 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2273 | } else { |
2274 | struct l2cap_info_rsp rsp; | |
2275 | rsp.type = cpu_to_le16(type); | |
2276 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2277 | l2cap_send_cmd(conn, cmd->ident, | |
2278 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2279 | } | |
1da177e4 LT |
2280 | |
2281 | return 0; | |
2282 | } | |
2283 | ||
2284 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2285 | { | |
2286 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2287 | u16 type, result; | |
2288 | ||
2289 | type = __le16_to_cpu(rsp->type); | |
2290 | result = __le16_to_cpu(rsp->result); | |
2291 | ||
2292 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2293 | ||
4e8402a3 MH |
2294 | del_timer(&conn->info_timer); |
2295 | ||
984947dc | 2296 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2297 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2298 | |
47ec1dcd | 2299 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2300 | struct l2cap_info_req req; |
2301 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2302 | ||
2303 | conn->info_ident = l2cap_get_ident(conn); | |
2304 | ||
2305 | l2cap_send_cmd(conn, conn->info_ident, | |
2306 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2307 | } else { | |
2308 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2309 | conn->info_ident = 0; | |
2310 | ||
2311 | l2cap_conn_start(conn); | |
2312 | } | |
2313 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2314 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2315 | conn->info_ident = 0; |
984947dc MH |
2316 | |
2317 | l2cap_conn_start(conn); | |
2318 | } | |
4e8402a3 | 2319 | |
1da177e4 LT |
2320 | return 0; |
2321 | } | |
2322 | ||
2323 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
2324 | { | |
2325 | u8 *data = skb->data; | |
2326 | int len = skb->len; | |
2327 | struct l2cap_cmd_hdr cmd; | |
2328 | int err = 0; | |
2329 | ||
2330 | l2cap_raw_recv(conn, skb); | |
2331 | ||
2332 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2333 | u16 cmd_len; |
1da177e4 LT |
2334 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2335 | data += L2CAP_CMD_HDR_SIZE; | |
2336 | len -= L2CAP_CMD_HDR_SIZE; | |
2337 | ||
88219a0f | 2338 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2339 | |
88219a0f | 2340 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2341 | |
88219a0f | 2342 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2343 | BT_DBG("corrupted command"); |
2344 | break; | |
2345 | } | |
2346 | ||
2347 | switch (cmd.code) { | |
2348 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 2349 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
2350 | break; |
2351 | ||
2352 | case L2CAP_CONN_REQ: | |
2353 | err = l2cap_connect_req(conn, &cmd, data); | |
2354 | break; | |
2355 | ||
2356 | case L2CAP_CONN_RSP: | |
2357 | err = l2cap_connect_rsp(conn, &cmd, data); | |
2358 | break; | |
2359 | ||
2360 | case L2CAP_CONF_REQ: | |
88219a0f | 2361 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
2362 | break; |
2363 | ||
2364 | case L2CAP_CONF_RSP: | |
2365 | err = l2cap_config_rsp(conn, &cmd, data); | |
2366 | break; | |
2367 | ||
2368 | case L2CAP_DISCONN_REQ: | |
2369 | err = l2cap_disconnect_req(conn, &cmd, data); | |
2370 | break; | |
2371 | ||
2372 | case L2CAP_DISCONN_RSP: | |
2373 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
2374 | break; | |
2375 | ||
2376 | case L2CAP_ECHO_REQ: | |
88219a0f | 2377 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
2378 | break; |
2379 | ||
2380 | case L2CAP_ECHO_RSP: | |
2381 | break; | |
2382 | ||
2383 | case L2CAP_INFO_REQ: | |
2384 | err = l2cap_information_req(conn, &cmd, data); | |
2385 | break; | |
2386 | ||
2387 | case L2CAP_INFO_RSP: | |
2388 | err = l2cap_information_rsp(conn, &cmd, data); | |
2389 | break; | |
2390 | ||
2391 | default: | |
2392 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
2393 | err = -EINVAL; | |
2394 | break; | |
2395 | } | |
2396 | ||
2397 | if (err) { | |
2398 | struct l2cap_cmd_rej rej; | |
2399 | BT_DBG("error %d", err); | |
2400 | ||
2401 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2402 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2403 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2404 | } | |
2405 | ||
88219a0f AV |
2406 | data += cmd_len; |
2407 | len -= cmd_len; | |
1da177e4 LT |
2408 | } |
2409 | ||
2410 | kfree_skb(skb); | |
2411 | } | |
2412 | ||
2413 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) | |
2414 | { | |
2415 | struct sock *sk; | |
2416 | ||
2417 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
2418 | if (!sk) { | |
2419 | BT_DBG("unknown cid 0x%4.4x", cid); | |
2420 | goto drop; | |
2421 | } | |
2422 | ||
2423 | BT_DBG("sk %p, len %d", sk, skb->len); | |
2424 | ||
2425 | if (sk->sk_state != BT_CONNECTED) | |
2426 | goto drop; | |
2427 | ||
2428 | if (l2cap_pi(sk)->imtu < skb->len) | |
2429 | goto drop; | |
2430 | ||
2431 | /* If socket recv buffers overflows we drop data here | |
2432 | * which is *bad* because L2CAP has to be reliable. | |
2433 | * But we don't have any other choice. L2CAP doesn't | |
2434 | * provide flow control mechanism. */ | |
2435 | ||
2436 | if (!sock_queue_rcv_skb(sk, skb)) | |
2437 | goto done; | |
2438 | ||
2439 | drop: | |
2440 | kfree_skb(skb); | |
2441 | ||
2442 | done: | |
0139418c MH |
2443 | if (sk) |
2444 | bh_unlock_sock(sk); | |
2445 | ||
1da177e4 LT |
2446 | return 0; |
2447 | } | |
2448 | ||
8e036fc3 | 2449 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
2450 | { |
2451 | struct sock *sk; | |
2452 | ||
2453 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
2454 | if (!sk) | |
2455 | goto drop; | |
2456 | ||
2457 | BT_DBG("sk %p, len %d", sk, skb->len); | |
2458 | ||
2459 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
2460 | goto drop; | |
2461 | ||
2462 | if (l2cap_pi(sk)->imtu < skb->len) | |
2463 | goto drop; | |
2464 | ||
2465 | if (!sock_queue_rcv_skb(sk, skb)) | |
2466 | goto done; | |
2467 | ||
2468 | drop: | |
2469 | kfree_skb(skb); | |
2470 | ||
2471 | done: | |
af05b30b GP |
2472 | if (sk) |
2473 | bh_unlock_sock(sk); | |
1da177e4 LT |
2474 | return 0; |
2475 | } | |
2476 | ||
2477 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
2478 | { | |
2479 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
2480 | u16 cid, len; |
2481 | __le16 psm; | |
1da177e4 LT |
2482 | |
2483 | skb_pull(skb, L2CAP_HDR_SIZE); | |
2484 | cid = __le16_to_cpu(lh->cid); | |
2485 | len = __le16_to_cpu(lh->len); | |
2486 | ||
2487 | BT_DBG("len %d, cid 0x%4.4x", len, cid); | |
2488 | ||
2489 | switch (cid) { | |
8db4dc46 | 2490 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
2491 | l2cap_sig_channel(conn, skb); |
2492 | break; | |
2493 | ||
8db4dc46 | 2494 | case L2CAP_CID_CONN_LESS: |
8e036fc3 | 2495 | psm = get_unaligned((__le16 *) skb->data); |
1da177e4 LT |
2496 | skb_pull(skb, 2); |
2497 | l2cap_conless_channel(conn, psm, skb); | |
2498 | break; | |
2499 | ||
2500 | default: | |
2501 | l2cap_data_channel(conn, cid, skb); | |
2502 | break; | |
2503 | } | |
2504 | } | |
2505 | ||
2506 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
2507 | ||
2508 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
2509 | { | |
2510 | int exact = 0, lm1 = 0, lm2 = 0; | |
2511 | register struct sock *sk; | |
2512 | struct hlist_node *node; | |
2513 | ||
2514 | if (type != ACL_LINK) | |
2515 | return 0; | |
2516 | ||
2517 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
2518 | ||
2519 | /* Find listening sockets and check their link_mode */ | |
2520 | read_lock(&l2cap_sk_list.lock); | |
2521 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
2522 | if (sk->sk_state != BT_LISTEN) | |
2523 | continue; | |
2524 | ||
2525 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
2526 | lm1 |= HCI_LM_ACCEPT; |
2527 | if (l2cap_pi(sk)->role_switch) | |
2528 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 2529 | exact++; |
2af6b9d5 MH |
2530 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
2531 | lm2 |= HCI_LM_ACCEPT; | |
2532 | if (l2cap_pi(sk)->role_switch) | |
2533 | lm2 |= HCI_LM_MASTER; | |
2534 | } | |
1da177e4 LT |
2535 | } |
2536 | read_unlock(&l2cap_sk_list.lock); | |
2537 | ||
2538 | return exact ? lm1 : lm2; | |
2539 | } | |
2540 | ||
2541 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
2542 | { | |
0139418c MH |
2543 | struct l2cap_conn *conn; |
2544 | ||
1da177e4 LT |
2545 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
2546 | ||
2547 | if (hcon->type != ACL_LINK) | |
2548 | return 0; | |
2549 | ||
2550 | if (!status) { | |
1da177e4 LT |
2551 | conn = l2cap_conn_add(hcon, status); |
2552 | if (conn) | |
2553 | l2cap_conn_ready(conn); | |
0139418c | 2554 | } else |
1da177e4 LT |
2555 | l2cap_conn_del(hcon, bt_err(status)); |
2556 | ||
2557 | return 0; | |
2558 | } | |
2559 | ||
2950f21a MH |
2560 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
2561 | { | |
2562 | struct l2cap_conn *conn = hcon->l2cap_data; | |
2563 | ||
2564 | BT_DBG("hcon %p", hcon); | |
2565 | ||
2566 | if (hcon->type != ACL_LINK || !conn) | |
2567 | return 0x13; | |
2568 | ||
2569 | return conn->disc_reason; | |
2570 | } | |
2571 | ||
2572 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
2573 | { |
2574 | BT_DBG("hcon %p reason %d", hcon, reason); | |
2575 | ||
2576 | if (hcon->type != ACL_LINK) | |
2577 | return 0; | |
2578 | ||
2579 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 2580 | |
1da177e4 LT |
2581 | return 0; |
2582 | } | |
2583 | ||
f62e4323 MH |
2584 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
2585 | { | |
255c7601 MH |
2586 | if (sk->sk_type != SOCK_SEQPACKET) |
2587 | return; | |
2588 | ||
f62e4323 MH |
2589 | if (encrypt == 0x00) { |
2590 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
2591 | l2cap_sock_clear_timer(sk); | |
2592 | l2cap_sock_set_timer(sk, HZ * 5); | |
2593 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
2594 | __l2cap_sock_close(sk, ECONNREFUSED); | |
2595 | } else { | |
2596 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
2597 | l2cap_sock_clear_timer(sk); | |
2598 | } | |
2599 | } | |
2600 | ||
8c1b2355 | 2601 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
2602 | { |
2603 | struct l2cap_chan_list *l; | |
0139418c | 2604 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 2605 | struct sock *sk; |
1da177e4 | 2606 | |
0139418c | 2607 | if (!conn) |
1da177e4 | 2608 | return 0; |
0139418c | 2609 | |
1da177e4 LT |
2610 | l = &conn->chan_list; |
2611 | ||
2612 | BT_DBG("conn %p", conn); | |
2613 | ||
2614 | read_lock(&l->lock); | |
2615 | ||
2616 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2617 | bh_lock_sock(sk); | |
2618 | ||
6a8d3010 MH |
2619 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
2620 | bh_unlock_sock(sk); | |
2621 | continue; | |
2622 | } | |
2623 | ||
f62e4323 | 2624 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 2625 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 2626 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
2627 | bh_unlock_sock(sk); |
2628 | continue; | |
2629 | } | |
2630 | ||
b1235d79 MH |
2631 | if (sk->sk_state == BT_CONNECT) { |
2632 | if (!status) { | |
2633 | struct l2cap_conn_req req; | |
2634 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2635 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 2636 | |
b1235d79 | 2637 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
1da177e4 | 2638 | |
b1235d79 MH |
2639 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2640 | L2CAP_CONN_REQ, sizeof(req), &req); | |
2641 | } else { | |
2642 | l2cap_sock_clear_timer(sk); | |
2643 | l2cap_sock_set_timer(sk, HZ / 10); | |
2644 | } | |
2645 | } else if (sk->sk_state == BT_CONNECT2) { | |
2646 | struct l2cap_conn_rsp rsp; | |
2647 | __u16 result; | |
1da177e4 | 2648 | |
b1235d79 MH |
2649 | if (!status) { |
2650 | sk->sk_state = BT_CONFIG; | |
2651 | result = L2CAP_CR_SUCCESS; | |
2652 | } else { | |
2653 | sk->sk_state = BT_DISCONN; | |
2654 | l2cap_sock_set_timer(sk, HZ / 10); | |
2655 | result = L2CAP_CR_SEC_BLOCK; | |
2656 | } | |
2657 | ||
2658 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
2659 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
2660 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 2661 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
2662 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
2663 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
2664 | } | |
1da177e4 LT |
2665 | |
2666 | bh_unlock_sock(sk); | |
2667 | } | |
2668 | ||
2669 | read_unlock(&l->lock); | |
b1235d79 | 2670 | |
1da177e4 LT |
2671 | return 0; |
2672 | } | |
2673 | ||
2674 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
2675 | { | |
2676 | struct l2cap_conn *conn = hcon->l2cap_data; | |
2677 | ||
2678 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
2679 | goto drop; | |
2680 | ||
2681 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
2682 | ||
2683 | if (flags & ACL_START) { | |
2684 | struct l2cap_hdr *hdr; | |
2685 | int len; | |
2686 | ||
2687 | if (conn->rx_len) { | |
2688 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
2689 | kfree_skb(conn->rx_skb); | |
2690 | conn->rx_skb = NULL; | |
2691 | conn->rx_len = 0; | |
2692 | l2cap_conn_unreliable(conn, ECOMM); | |
2693 | } | |
2694 | ||
2695 | if (skb->len < 2) { | |
2696 | BT_ERR("Frame is too short (len %d)", skb->len); | |
2697 | l2cap_conn_unreliable(conn, ECOMM); | |
2698 | goto drop; | |
2699 | } | |
2700 | ||
2701 | hdr = (struct l2cap_hdr *) skb->data; | |
2702 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
2703 | ||
2704 | if (len == skb->len) { | |
2705 | /* Complete frame received */ | |
2706 | l2cap_recv_frame(conn, skb); | |
2707 | return 0; | |
2708 | } | |
2709 | ||
2710 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
2711 | ||
2712 | if (skb->len > len) { | |
2713 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
2714 | skb->len, len); | |
2715 | l2cap_conn_unreliable(conn, ECOMM); | |
2716 | goto drop; | |
2717 | } | |
2718 | ||
2719 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
2720 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
2721 | if (!conn->rx_skb) | |
1da177e4 LT |
2722 | goto drop; |
2723 | ||
d626f62b | 2724 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 2725 | skb->len); |
1da177e4 LT |
2726 | conn->rx_len = len - skb->len; |
2727 | } else { | |
2728 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
2729 | ||
2730 | if (!conn->rx_len) { | |
2731 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
2732 | l2cap_conn_unreliable(conn, ECOMM); | |
2733 | goto drop; | |
2734 | } | |
2735 | ||
2736 | if (skb->len > conn->rx_len) { | |
2737 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
2738 | skb->len, conn->rx_len); | |
2739 | kfree_skb(conn->rx_skb); | |
2740 | conn->rx_skb = NULL; | |
2741 | conn->rx_len = 0; | |
2742 | l2cap_conn_unreliable(conn, ECOMM); | |
2743 | goto drop; | |
2744 | } | |
2745 | ||
d626f62b | 2746 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 2747 | skb->len); |
1da177e4 LT |
2748 | conn->rx_len -= skb->len; |
2749 | ||
2750 | if (!conn->rx_len) { | |
2751 | /* Complete frame received */ | |
2752 | l2cap_recv_frame(conn, conn->rx_skb); | |
2753 | conn->rx_skb = NULL; | |
2754 | } | |
2755 | } | |
2756 | ||
2757 | drop: | |
2758 | kfree_skb(skb); | |
2759 | return 0; | |
2760 | } | |
2761 | ||
be9d1227 | 2762 | static ssize_t l2cap_sysfs_show(struct class *dev, char *buf) |
1da177e4 LT |
2763 | { |
2764 | struct sock *sk; | |
2765 | struct hlist_node *node; | |
be9d1227 | 2766 | char *str = buf; |
1da177e4 LT |
2767 | |
2768 | read_lock_bh(&l2cap_sk_list.lock); | |
2769 | ||
be9d1227 MH |
2770 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
2771 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1da177e4 | 2772 | |
2af6b9d5 | 2773 | str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
be9d1227 | 2774 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), |
b4324b5d MH |
2775 | sk->sk_state, __le16_to_cpu(pi->psm), pi->scid, |
2776 | pi->dcid, pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 2777 | } |
1da177e4 | 2778 | |
1da177e4 | 2779 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 2780 | |
af05b30b | 2781 | return str - buf; |
1da177e4 LT |
2782 | } |
2783 | ||
be9d1227 | 2784 | static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL); |
1da177e4 | 2785 | |
90ddc4f0 | 2786 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
2787 | .family = PF_BLUETOOTH, |
2788 | .owner = THIS_MODULE, | |
2789 | .release = l2cap_sock_release, | |
2790 | .bind = l2cap_sock_bind, | |
2791 | .connect = l2cap_sock_connect, | |
2792 | .listen = l2cap_sock_listen, | |
2793 | .accept = l2cap_sock_accept, | |
2794 | .getname = l2cap_sock_getname, | |
2795 | .sendmsg = l2cap_sock_sendmsg, | |
f66dc81f | 2796 | .recvmsg = l2cap_sock_recvmsg, |
1da177e4 | 2797 | .poll = bt_sock_poll, |
3241ad82 | 2798 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
2799 | .mmap = sock_no_mmap, |
2800 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
2801 | .shutdown = l2cap_sock_shutdown, |
2802 | .setsockopt = l2cap_sock_setsockopt, | |
2803 | .getsockopt = l2cap_sock_getsockopt | |
2804 | }; | |
2805 | ||
2806 | static struct net_proto_family l2cap_sock_family_ops = { | |
2807 | .family = PF_BLUETOOTH, | |
2808 | .owner = THIS_MODULE, | |
2809 | .create = l2cap_sock_create, | |
2810 | }; | |
2811 | ||
2812 | static struct hci_proto l2cap_hci_proto = { | |
2813 | .name = "L2CAP", | |
2814 | .id = HCI_PROTO_L2CAP, | |
2815 | .connect_ind = l2cap_connect_ind, | |
2816 | .connect_cfm = l2cap_connect_cfm, | |
2817 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 2818 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 2819 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
2820 | .recv_acldata = l2cap_recv_acldata |
2821 | }; | |
2822 | ||
2823 | static int __init l2cap_init(void) | |
2824 | { | |
2825 | int err; | |
be9d1227 | 2826 | |
1da177e4 LT |
2827 | err = proto_register(&l2cap_proto, 0); |
2828 | if (err < 0) | |
2829 | return err; | |
2830 | ||
2831 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); | |
2832 | if (err < 0) { | |
2833 | BT_ERR("L2CAP socket registration failed"); | |
2834 | goto error; | |
2835 | } | |
2836 | ||
2837 | err = hci_register_proto(&l2cap_hci_proto); | |
2838 | if (err < 0) { | |
2839 | BT_ERR("L2CAP protocol registration failed"); | |
2840 | bt_sock_unregister(BTPROTO_L2CAP); | |
2841 | goto error; | |
2842 | } | |
2843 | ||
df5c37ea MH |
2844 | if (class_create_file(bt_class, &class_attr_l2cap) < 0) |
2845 | BT_ERR("Failed to create L2CAP info file"); | |
1da177e4 LT |
2846 | |
2847 | BT_INFO("L2CAP ver %s", VERSION); | |
2848 | BT_INFO("L2CAP socket layer initialized"); | |
2849 | ||
2850 | return 0; | |
2851 | ||
2852 | error: | |
2853 | proto_unregister(&l2cap_proto); | |
2854 | return err; | |
2855 | } | |
2856 | ||
2857 | static void __exit l2cap_exit(void) | |
2858 | { | |
a91f2e39 | 2859 | class_remove_file(bt_class, &class_attr_l2cap); |
1da177e4 LT |
2860 | |
2861 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) | |
2862 | BT_ERR("L2CAP socket unregistration failed"); | |
2863 | ||
2864 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
2865 | BT_ERR("L2CAP protocol unregistration failed"); | |
2866 | ||
2867 | proto_unregister(&l2cap_proto); | |
2868 | } | |
2869 | ||
2870 | void l2cap_load(void) | |
2871 | { | |
2872 | /* Dummy function to trigger automatic L2CAP module loading by | |
2873 | * other modules that use L2CAP sockets but don't use any other | |
2874 | * symbols from it. */ | |
2875 | return; | |
2876 | } | |
2877 | EXPORT_SYMBOL(l2cap_load); | |
2878 | ||
2879 | module_init(l2cap_init); | |
2880 | module_exit(l2cap_exit); | |
2881 | ||
44dd46de MH |
2882 | module_param(enable_ertm, bool, 0644); |
2883 | MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); | |
2884 | ||
63fbd24e | 2885 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
2886 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
2887 | MODULE_VERSION(VERSION); | |
2888 | MODULE_LICENSE("GPL"); | |
2889 | MODULE_ALIAS("bt-proto-0"); |