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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> |
aef7d97c MH |
43 | #include <linux/debugfs.h> |
44 | #include <linux/seq_file.h> | |
af05b30b | 45 | #include <linux/uaccess.h> |
fcc203c3 | 46 | #include <linux/crc16.h> |
1da177e4 LT |
47 | #include <net/sock.h> |
48 | ||
49 | #include <asm/system.h> | |
1da177e4 LT |
50 | #include <asm/unaligned.h> |
51 | ||
52 | #include <net/bluetooth/bluetooth.h> | |
53 | #include <net/bluetooth/hci_core.h> | |
54 | #include <net/bluetooth/l2cap.h> | |
55 | ||
44dd46de MH |
56 | #define VERSION "2.14" |
57 | ||
84fb0a63 GP |
58 | #ifdef CONFIG_BT_L2CAP_EXT_FEATURES |
59 | static int enable_ertm = 1; | |
60 | #else | |
44dd46de | 61 | static int enable_ertm = 0; |
84fb0a63 | 62 | #endif |
5fbcd3d1 | 63 | static int max_transmit = L2CAP_DEFAULT_MAX_TX; |
369ba302 | 64 | static int tx_window = L2CAP_DEFAULT_TX_WINDOW; |
f0709e03 | 65 | |
47ec1dcd | 66 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 67 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 68 | |
90ddc4f0 | 69 | static const struct proto_ops l2cap_sock_ops; |
1da177e4 LT |
70 | |
71 | static struct bt_sock_list l2cap_sk_list = { | |
d5fb2962 | 72 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
73 | }; |
74 | ||
1da177e4 LT |
75 | static void __l2cap_sock_close(struct sock *sk, int reason); |
76 | static void l2cap_sock_close(struct sock *sk); | |
77 | static void l2cap_sock_kill(struct sock *sk); | |
78 | ||
79 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
80 | u8 code, u8 ident, u16 dlen, void *data); | |
81 | ||
82 | /* ---- L2CAP timers ---- */ | |
83 | static void l2cap_sock_timeout(unsigned long arg) | |
84 | { | |
85 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 86 | int reason; |
1da177e4 LT |
87 | |
88 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
89 | ||
90 | bh_lock_sock(sk); | |
b1235d79 | 91 | |
f62e4323 MH |
92 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) |
93 | reason = ECONNREFUSED; | |
94 | else if (sk->sk_state == BT_CONNECT && | |
2af6b9d5 | 95 | l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) |
b1235d79 MH |
96 | reason = ECONNREFUSED; |
97 | else | |
98 | reason = ETIMEDOUT; | |
99 | ||
100 | __l2cap_sock_close(sk, reason); | |
101 | ||
1da177e4 LT |
102 | bh_unlock_sock(sk); |
103 | ||
104 | l2cap_sock_kill(sk); | |
105 | sock_put(sk); | |
106 | } | |
107 | ||
108 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
109 | { | |
110 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
111 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
112 | } | |
113 | ||
114 | static void l2cap_sock_clear_timer(struct sock *sk) | |
115 | { | |
116 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
117 | sk_stop_timer(sk, &sk->sk_timer); | |
118 | } | |
119 | ||
0139418c MH |
120 | /* ---- L2CAP channels ---- */ |
121 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
122 | { | |
123 | struct sock *s; | |
124 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
125 | if (l2cap_pi(s)->dcid == cid) | |
126 | break; | |
127 | } | |
128 | return s; | |
129 | } | |
130 | ||
131 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
132 | { | |
133 | struct sock *s; | |
134 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
135 | if (l2cap_pi(s)->scid == cid) | |
136 | break; | |
137 | } | |
138 | return s; | |
139 | } | |
140 | ||
141 | /* Find channel with given SCID. | |
142 | * Returns locked socket */ | |
143 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
144 | { | |
145 | struct sock *s; | |
146 | read_lock(&l->lock); | |
147 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
148 | if (s) |
149 | bh_lock_sock(s); | |
0139418c MH |
150 | read_unlock(&l->lock); |
151 | return s; | |
152 | } | |
153 | ||
154 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
155 | { | |
156 | struct sock *s; | |
157 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
158 | if (l2cap_pi(s)->ident == ident) | |
159 | break; | |
160 | } | |
161 | return s; | |
162 | } | |
163 | ||
164 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
165 | { | |
166 | struct sock *s; | |
167 | read_lock(&l->lock); | |
168 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
169 | if (s) |
170 | bh_lock_sock(s); | |
0139418c MH |
171 | read_unlock(&l->lock); |
172 | return s; | |
173 | } | |
174 | ||
175 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
176 | { | |
8db4dc46 | 177 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 178 | |
8db4dc46 | 179 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 180 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
181 | return cid; |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
188 | { | |
189 | sock_hold(sk); | |
190 | ||
191 | if (l->head) | |
192 | l2cap_pi(l->head)->prev_c = sk; | |
193 | ||
194 | l2cap_pi(sk)->next_c = l->head; | |
195 | l2cap_pi(sk)->prev_c = NULL; | |
196 | l->head = sk; | |
197 | } | |
198 | ||
199 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
200 | { | |
201 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
202 | ||
fd1278d7 | 203 | write_lock_bh(&l->lock); |
0139418c MH |
204 | if (sk == l->head) |
205 | l->head = next; | |
206 | ||
207 | if (next) | |
208 | l2cap_pi(next)->prev_c = prev; | |
209 | if (prev) | |
210 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 211 | write_unlock_bh(&l->lock); |
0139418c MH |
212 | |
213 | __sock_put(sk); | |
214 | } | |
215 | ||
216 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
217 | { | |
218 | struct l2cap_chan_list *l = &conn->chan_list; | |
219 | ||
af05b30b GP |
220 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
221 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 222 | |
2950f21a MH |
223 | conn->disc_reason = 0x13; |
224 | ||
0139418c MH |
225 | l2cap_pi(sk)->conn = conn; |
226 | ||
bd3c9e25 | 227 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
0139418c MH |
228 | /* Alloc CID for connection-oriented socket */ |
229 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
230 | } else if (sk->sk_type == SOCK_DGRAM) { | |
231 | /* Connectionless socket */ | |
8db4dc46 GP |
232 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
233 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
234 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
235 | } else { | |
236 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
237 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
238 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
239 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
240 | } | |
241 | ||
242 | __l2cap_chan_link(l, sk); | |
243 | ||
244 | if (parent) | |
245 | bt_accept_enqueue(parent, sk); | |
246 | } | |
247 | ||
8e87d142 | 248 | /* Delete channel. |
0139418c MH |
249 | * Must be called on the locked socket. */ |
250 | static void l2cap_chan_del(struct sock *sk, int err) | |
251 | { | |
252 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
253 | struct sock *parent = bt_sk(sk)->parent; | |
254 | ||
255 | l2cap_sock_clear_timer(sk); | |
256 | ||
257 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
258 | ||
8e87d142 | 259 | if (conn) { |
0139418c MH |
260 | /* Unlink from channel list */ |
261 | l2cap_chan_unlink(&conn->chan_list, sk); | |
262 | l2cap_pi(sk)->conn = NULL; | |
263 | hci_conn_put(conn->hcon); | |
264 | } | |
265 | ||
b1235d79 | 266 | sk->sk_state = BT_CLOSED; |
0139418c MH |
267 | sock_set_flag(sk, SOCK_ZAPPED); |
268 | ||
269 | if (err) | |
270 | sk->sk_err = err; | |
271 | ||
272 | if (parent) { | |
273 | bt_accept_unlink(sk); | |
274 | parent->sk_data_ready(parent, 0); | |
275 | } else | |
276 | sk->sk_state_change(sk); | |
277 | } | |
278 | ||
79d554a6 | 279 | /* Service level security */ |
2af6b9d5 | 280 | static inline int l2cap_check_security(struct sock *sk) |
79d554a6 MH |
281 | { |
282 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
0684e5f9 MH |
283 | __u8 auth_type; |
284 | ||
00ae4af9 MH |
285 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
286 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
287 | auth_type = HCI_AT_NO_BONDING_MITM; | |
288 | else | |
af05b30b | 289 | auth_type = HCI_AT_NO_BONDING; |
00ae4af9 MH |
290 | |
291 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
292 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
293 | } else { | |
294 | switch (l2cap_pi(sk)->sec_level) { | |
295 | case BT_SECURITY_HIGH: | |
296 | auth_type = HCI_AT_GENERAL_BONDING_MITM; | |
297 | break; | |
298 | case BT_SECURITY_MEDIUM: | |
299 | auth_type = HCI_AT_GENERAL_BONDING; | |
300 | break; | |
301 | default: | |
302 | auth_type = HCI_AT_NO_BONDING; | |
303 | break; | |
304 | } | |
0684e5f9 | 305 | } |
79d554a6 | 306 | |
0684e5f9 MH |
307 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
308 | auth_type); | |
79d554a6 MH |
309 | } |
310 | ||
4e8402a3 MH |
311 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
312 | { | |
313 | u8 id; | |
314 | ||
315 | /* Get next available identificator. | |
316 | * 1 - 128 are used by kernel. | |
317 | * 129 - 199 are reserved. | |
318 | * 200 - 254 are used by utilities like l2ping, etc. | |
319 | */ | |
320 | ||
321 | spin_lock_bh(&conn->lock); | |
322 | ||
323 | if (++conn->tx_ident > 128) | |
324 | conn->tx_ident = 1; | |
325 | ||
326 | id = conn->tx_ident; | |
327 | ||
328 | spin_unlock_bh(&conn->lock); | |
329 | ||
330 | return id; | |
331 | } | |
332 | ||
9a9c6a34 | 333 | static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
334 | { |
335 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
336 | ||
337 | BT_DBG("code 0x%2.2x", code); | |
338 | ||
339 | if (!skb) | |
9a9c6a34 | 340 | return; |
4e8402a3 | 341 | |
9a9c6a34 | 342 | hci_send_acl(conn->hcon, skb, 0); |
4e8402a3 MH |
343 | } |
344 | ||
9a9c6a34 | 345 | static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
1c2acffb GP |
346 | { |
347 | struct sk_buff *skb; | |
348 | struct l2cap_hdr *lh; | |
349 | struct l2cap_conn *conn = pi->conn; | |
fcc203c3 GP |
350 | int count, hlen = L2CAP_HDR_SIZE + 2; |
351 | ||
352 | if (pi->fcs == L2CAP_FCS_CRC16) | |
353 | hlen += 2; | |
1c2acffb GP |
354 | |
355 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
356 | ||
fcc203c3 | 357 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
358 | control |= L2CAP_CTRL_FRAME_TYPE; |
359 | ||
9e917af1 GP |
360 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
361 | control |= L2CAP_CTRL_FINAL; | |
362 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
363 | } | |
364 | ||
f0946ccf GP |
365 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
366 | control |= L2CAP_CTRL_POLL; | |
367 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
368 | } | |
369 | ||
1c2acffb GP |
370 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
371 | if (!skb) | |
9a9c6a34 | 372 | return; |
1c2acffb GP |
373 | |
374 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 375 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
376 | lh->cid = cpu_to_le16(pi->dcid); |
377 | put_unaligned_le16(control, skb_put(skb, 2)); | |
378 | ||
fcc203c3 GP |
379 | if (pi->fcs == L2CAP_FCS_CRC16) { |
380 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
381 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
382 | } | |
383 | ||
9a9c6a34 | 384 | hci_send_acl(pi->conn->hcon, skb, 0); |
1c2acffb GP |
385 | } |
386 | ||
9a9c6a34 | 387 | static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
7e743090 GP |
388 | { |
389 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) | |
390 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
391 | else | |
392 | control |= L2CAP_SUPER_RCV_READY; | |
393 | ||
2ab25cdd GP |
394 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
395 | ||
9a9c6a34 | 396 | l2cap_send_sframe(pi, control); |
7e743090 GP |
397 | } |
398 | ||
79d554a6 MH |
399 | static void l2cap_do_start(struct sock *sk) |
400 | { | |
401 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
402 | ||
403 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
404 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
405 | return; | |
406 | ||
2af6b9d5 | 407 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
408 | struct l2cap_conn_req req; |
409 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
410 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 411 | |
b1235d79 | 412 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 413 | |
b1235d79 | 414 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 415 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 416 | } |
79d554a6 MH |
417 | } else { |
418 | struct l2cap_info_req req; | |
419 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
420 | ||
421 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
422 | conn->info_ident = l2cap_get_ident(conn); | |
423 | ||
424 | mod_timer(&conn->info_timer, jiffies + | |
425 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
426 | ||
427 | l2cap_send_cmd(conn, conn->info_ident, | |
428 | L2CAP_INFO_REQ, sizeof(req), &req); | |
429 | } | |
430 | } | |
431 | ||
22121fc9 GP |
432 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk) |
433 | { | |
434 | struct l2cap_disconn_req req; | |
435 | ||
436 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
437 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
438 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
439 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
440 | } | |
441 | ||
1da177e4 | 442 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
443 | static void l2cap_conn_start(struct l2cap_conn *conn) |
444 | { | |
445 | struct l2cap_chan_list *l = &conn->chan_list; | |
446 | struct sock *sk; | |
447 | ||
448 | BT_DBG("conn %p", conn); | |
449 | ||
450 | read_lock(&l->lock); | |
451 | ||
452 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
453 | bh_lock_sock(sk); | |
454 | ||
bd3c9e25 GP |
455 | if (sk->sk_type != SOCK_SEQPACKET && |
456 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
457 | bh_unlock_sock(sk); |
458 | continue; | |
459 | } | |
460 | ||
461 | if (sk->sk_state == BT_CONNECT) { | |
2af6b9d5 | 462 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
463 | struct l2cap_conn_req req; |
464 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
465 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 466 | |
b1235d79 | 467 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 468 | |
b1235d79 | 469 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 470 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 471 | } |
79d554a6 MH |
472 | } else if (sk->sk_state == BT_CONNECT2) { |
473 | struct l2cap_conn_rsp rsp; | |
474 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
475 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
476 | ||
2af6b9d5 | 477 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
478 | if (bt_sk(sk)->defer_setup) { |
479 | struct sock *parent = bt_sk(sk)->parent; | |
480 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
481 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
482 | parent->sk_data_ready(parent, 0); | |
483 | ||
484 | } else { | |
485 | sk->sk_state = BT_CONFIG; | |
486 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
487 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
488 | } | |
79d554a6 MH |
489 | } else { |
490 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
491 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
492 | } | |
493 | ||
494 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
495 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
496 | } |
497 | ||
498 | bh_unlock_sock(sk); | |
499 | } | |
500 | ||
501 | read_unlock(&l->lock); | |
502 | } | |
503 | ||
504 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
505 | { | |
79d554a6 MH |
506 | struct l2cap_chan_list *l = &conn->chan_list; |
507 | struct sock *sk; | |
4e8402a3 | 508 | |
79d554a6 | 509 | BT_DBG("conn %p", conn); |
4e8402a3 | 510 | |
79d554a6 | 511 | read_lock(&l->lock); |
4e8402a3 | 512 | |
79d554a6 MH |
513 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
514 | bh_lock_sock(sk); | |
4e8402a3 | 515 | |
bd3c9e25 GP |
516 | if (sk->sk_type != SOCK_SEQPACKET && |
517 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
518 | l2cap_sock_clear_timer(sk); |
519 | sk->sk_state = BT_CONNECTED; | |
520 | sk->sk_state_change(sk); | |
521 | } else if (sk->sk_state == BT_CONNECT) | |
522 | l2cap_do_start(sk); | |
4e8402a3 | 523 | |
79d554a6 | 524 | bh_unlock_sock(sk); |
4e8402a3 | 525 | } |
79d554a6 MH |
526 | |
527 | read_unlock(&l->lock); | |
4e8402a3 MH |
528 | } |
529 | ||
530 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
531 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
532 | { | |
533 | struct l2cap_chan_list *l = &conn->chan_list; | |
534 | struct sock *sk; | |
535 | ||
536 | BT_DBG("conn %p", conn); | |
537 | ||
538 | read_lock(&l->lock); | |
539 | ||
540 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 541 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
542 | sk->sk_err = err; |
543 | } | |
544 | ||
545 | read_unlock(&l->lock); | |
546 | } | |
547 | ||
548 | static void l2cap_info_timeout(unsigned long arg) | |
549 | { | |
550 | struct l2cap_conn *conn = (void *) arg; | |
551 | ||
984947dc | 552 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 553 | conn->info_ident = 0; |
984947dc | 554 | |
4e8402a3 MH |
555 | l2cap_conn_start(conn); |
556 | } | |
557 | ||
1da177e4 LT |
558 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
559 | { | |
0139418c | 560 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 561 | |
0139418c | 562 | if (conn || status) |
1da177e4 LT |
563 | return conn; |
564 | ||
0139418c MH |
565 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
566 | if (!conn) | |
1da177e4 | 567 | return NULL; |
1da177e4 LT |
568 | |
569 | hcon->l2cap_data = conn; | |
570 | conn->hcon = hcon; | |
571 | ||
0139418c MH |
572 | BT_DBG("hcon %p conn %p", hcon, conn); |
573 | ||
1da177e4 LT |
574 | conn->mtu = hcon->hdev->acl_mtu; |
575 | conn->src = &hcon->hdev->bdaddr; | |
576 | conn->dst = &hcon->dst; | |
577 | ||
4e8402a3 MH |
578 | conn->feat_mask = 0; |
579 | ||
1da177e4 LT |
580 | spin_lock_init(&conn->lock); |
581 | rwlock_init(&conn->chan_list.lock); | |
582 | ||
45054dc1 DY |
583 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
584 | (unsigned long) conn); | |
585 | ||
2950f21a MH |
586 | conn->disc_reason = 0x13; |
587 | ||
1da177e4 LT |
588 | return conn; |
589 | } | |
590 | ||
0139418c | 591 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 592 | { |
0139418c | 593 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
594 | struct sock *sk; |
595 | ||
0139418c MH |
596 | if (!conn) |
597 | return; | |
1da177e4 LT |
598 | |
599 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
600 | ||
7585b97a | 601 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
602 | |
603 | /* Kill channels */ | |
604 | while ((sk = conn->chan_list.head)) { | |
605 | bh_lock_sock(sk); | |
606 | l2cap_chan_del(sk, err); | |
607 | bh_unlock_sock(sk); | |
608 | l2cap_sock_kill(sk); | |
609 | } | |
610 | ||
8e8440f5 DY |
611 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
612 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 613 | |
1da177e4 LT |
614 | hcon->l2cap_data = NULL; |
615 | kfree(conn); | |
1da177e4 LT |
616 | } |
617 | ||
618 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
619 | { | |
620 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 621 | write_lock_bh(&l->lock); |
1da177e4 | 622 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 623 | write_unlock_bh(&l->lock); |
1da177e4 LT |
624 | } |
625 | ||
1da177e4 | 626 | /* ---- Socket interface ---- */ |
8e036fc3 | 627 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
628 | { |
629 | struct sock *sk; | |
630 | struct hlist_node *node; | |
631 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
632 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
633 | goto found; | |
634 | sk = NULL; | |
635 | found: | |
636 | return sk; | |
637 | } | |
638 | ||
639 | /* Find socket with psm and source bdaddr. | |
640 | * Returns closest match. | |
641 | */ | |
8e036fc3 | 642 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
643 | { |
644 | struct sock *sk = NULL, *sk1 = NULL; | |
645 | struct hlist_node *node; | |
646 | ||
647 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
648 | if (state && sk->sk_state != state) | |
649 | continue; | |
650 | ||
651 | if (l2cap_pi(sk)->psm == psm) { | |
652 | /* Exact match. */ | |
653 | if (!bacmp(&bt_sk(sk)->src, src)) | |
654 | break; | |
655 | ||
656 | /* Closest match */ | |
657 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
658 | sk1 = sk; | |
659 | } | |
660 | } | |
661 | return node ? sk : sk1; | |
662 | } | |
663 | ||
664 | /* Find socket with given address (psm, src). | |
665 | * Returns locked socket */ | |
8e036fc3 | 666 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
667 | { |
668 | struct sock *s; | |
669 | read_lock(&l2cap_sk_list.lock); | |
670 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
af05b30b GP |
671 | if (s) |
672 | bh_lock_sock(s); | |
1da177e4 LT |
673 | read_unlock(&l2cap_sk_list.lock); |
674 | return s; | |
675 | } | |
676 | ||
677 | static void l2cap_sock_destruct(struct sock *sk) | |
678 | { | |
679 | BT_DBG("sk %p", sk); | |
680 | ||
681 | skb_queue_purge(&sk->sk_receive_queue); | |
682 | skb_queue_purge(&sk->sk_write_queue); | |
683 | } | |
684 | ||
685 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
686 | { | |
687 | struct sock *sk; | |
688 | ||
689 | BT_DBG("parent %p", parent); | |
690 | ||
691 | /* Close not yet accepted channels */ | |
692 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
693 | l2cap_sock_close(sk); | |
694 | ||
b1235d79 | 695 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
696 | sock_set_flag(parent, SOCK_ZAPPED); |
697 | } | |
698 | ||
699 | /* Kill socket (only if zapped and orphan) | |
700 | * Must be called on unlocked socket. | |
701 | */ | |
702 | static void l2cap_sock_kill(struct sock *sk) | |
703 | { | |
704 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
705 | return; | |
706 | ||
707 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
708 | ||
709 | /* Kill poor orphan */ | |
710 | bt_sock_unlink(&l2cap_sk_list, sk); | |
711 | sock_set_flag(sk, SOCK_DEAD); | |
712 | sock_put(sk); | |
713 | } | |
714 | ||
715 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
716 | { | |
717 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
718 | ||
719 | switch (sk->sk_state) { | |
720 | case BT_LISTEN: | |
721 | l2cap_sock_cleanup_listen(sk); | |
722 | break; | |
723 | ||
724 | case BT_CONNECTED: | |
725 | case BT_CONFIG: | |
bd3c9e25 GP |
726 | if (sk->sk_type == SOCK_SEQPACKET || |
727 | sk->sk_type == SOCK_STREAM) { | |
1da177e4 | 728 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1da177e4 LT |
729 | |
730 | sk->sk_state = BT_DISCONN; | |
731 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
22121fc9 | 732 | l2cap_send_disconn_req(conn, sk); |
b1235d79 | 733 | } else |
1da177e4 | 734 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
735 | break; |
736 | ||
f66dc81f | 737 | case BT_CONNECT2: |
bd3c9e25 GP |
738 | if (sk->sk_type == SOCK_SEQPACKET || |
739 | sk->sk_type == SOCK_STREAM) { | |
f66dc81f MH |
740 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
741 | struct l2cap_conn_rsp rsp; | |
742 | __u16 result; | |
743 | ||
744 | if (bt_sk(sk)->defer_setup) | |
745 | result = L2CAP_CR_SEC_BLOCK; | |
746 | else | |
747 | result = L2CAP_CR_BAD_PSM; | |
748 | ||
749 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
750 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
751 | rsp.result = cpu_to_le16(result); | |
752 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
753 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
754 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
755 | } else | |
756 | l2cap_chan_del(sk, reason); | |
757 | break; | |
758 | ||
1da177e4 LT |
759 | case BT_CONNECT: |
760 | case BT_DISCONN: | |
761 | l2cap_chan_del(sk, reason); | |
762 | break; | |
763 | ||
764 | default: | |
765 | sock_set_flag(sk, SOCK_ZAPPED); | |
766 | break; | |
767 | } | |
768 | } | |
769 | ||
770 | /* Must be called on unlocked socket. */ | |
771 | static void l2cap_sock_close(struct sock *sk) | |
772 | { | |
773 | l2cap_sock_clear_timer(sk); | |
774 | lock_sock(sk); | |
775 | __l2cap_sock_close(sk, ECONNRESET); | |
776 | release_sock(sk); | |
777 | l2cap_sock_kill(sk); | |
778 | } | |
779 | ||
780 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
781 | { | |
782 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
783 | ||
784 | BT_DBG("sk %p", sk); | |
785 | ||
786 | if (parent) { | |
787 | sk->sk_type = parent->sk_type; | |
f66dc81f MH |
788 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
789 | ||
1da177e4 LT |
790 | pi->imtu = l2cap_pi(parent)->imtu; |
791 | pi->omtu = l2cap_pi(parent)->omtu; | |
c6b03cf9 MH |
792 | pi->mode = l2cap_pi(parent)->mode; |
793 | pi->fcs = l2cap_pi(parent)->fcs; | |
68d7f0ce | 794 | pi->max_tx = l2cap_pi(parent)->max_tx; |
14b5aa71 | 795 | pi->tx_win = l2cap_pi(parent)->tx_win; |
2af6b9d5 MH |
796 | pi->sec_level = l2cap_pi(parent)->sec_level; |
797 | pi->role_switch = l2cap_pi(parent)->role_switch; | |
798 | pi->force_reliable = l2cap_pi(parent)->force_reliable; | |
1da177e4 LT |
799 | } else { |
800 | pi->imtu = L2CAP_DEFAULT_MTU; | |
801 | pi->omtu = 0; | |
bd3c9e25 GP |
802 | if (enable_ertm && sk->sk_type == SOCK_STREAM) |
803 | pi->mode = L2CAP_MODE_ERTM; | |
804 | else | |
805 | pi->mode = L2CAP_MODE_BASIC; | |
68d7f0ce | 806 | pi->max_tx = max_transmit; |
c6b03cf9 | 807 | pi->fcs = L2CAP_FCS_CRC16; |
369ba302 | 808 | pi->tx_win = tx_window; |
2af6b9d5 MH |
809 | pi->sec_level = BT_SECURITY_LOW; |
810 | pi->role_switch = 0; | |
811 | pi->force_reliable = 0; | |
1da177e4 LT |
812 | } |
813 | ||
814 | /* Default config options */ | |
5dee9e7c | 815 | pi->conf_len = 0; |
1da177e4 | 816 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
45054dc1 DY |
817 | skb_queue_head_init(TX_QUEUE(sk)); |
818 | skb_queue_head_init(SREJ_QUEUE(sk)); | |
819 | INIT_LIST_HEAD(SREJ_LIST(sk)); | |
1da177e4 LT |
820 | } |
821 | ||
822 | static struct proto l2cap_proto = { | |
823 | .name = "L2CAP", | |
824 | .owner = THIS_MODULE, | |
825 | .obj_size = sizeof(struct l2cap_pinfo) | |
826 | }; | |
827 | ||
1b8d7ae4 | 828 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
829 | { |
830 | struct sock *sk; | |
831 | ||
6257ff21 | 832 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
833 | if (!sk) |
834 | return NULL; | |
835 | ||
836 | sock_init_data(sock, sk); | |
837 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
838 | ||
839 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 840 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
841 | |
842 | sock_reset_flag(sk, SOCK_ZAPPED); | |
843 | ||
844 | sk->sk_protocol = proto; | |
b1235d79 | 845 | sk->sk_state = BT_OPEN; |
1da177e4 | 846 | |
b1235d79 | 847 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
848 | |
849 | bt_sock_link(&l2cap_sk_list, sk); | |
850 | return sk; | |
851 | } | |
852 | ||
3f378b68 EP |
853 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
854 | int kern) | |
1da177e4 LT |
855 | { |
856 | struct sock *sk; | |
857 | ||
858 | BT_DBG("sock %p", sock); | |
859 | ||
860 | sock->state = SS_UNCONNECTED; | |
861 | ||
bd3c9e25 | 862 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && |
1da177e4 LT |
863 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
864 | return -ESOCKTNOSUPPORT; | |
865 | ||
c84b3268 | 866 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
1da177e4 LT |
867 | return -EPERM; |
868 | ||
869 | sock->ops = &l2cap_sock_ops; | |
870 | ||
1b8d7ae4 | 871 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
872 | if (!sk) |
873 | return -ENOMEM; | |
874 | ||
875 | l2cap_sock_init(sk, NULL); | |
876 | return 0; | |
877 | } | |
878 | ||
f29972de | 879 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
1da177e4 | 880 | { |
1da177e4 | 881 | struct sock *sk = sock->sk; |
f29972de MH |
882 | struct sockaddr_l2 la; |
883 | int len, err = 0; | |
1da177e4 | 884 | |
f29972de | 885 | BT_DBG("sk %p", sk); |
1da177e4 LT |
886 | |
887 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
888 | return -EINVAL; | |
889 | ||
f29972de MH |
890 | memset(&la, 0, sizeof(la)); |
891 | len = min_t(unsigned int, sizeof(la), alen); | |
892 | memcpy(&la, addr, len); | |
893 | ||
2a517ca6 MH |
894 | if (la.l2_cid) |
895 | return -EINVAL; | |
896 | ||
1da177e4 LT |
897 | lock_sock(sk); |
898 | ||
899 | if (sk->sk_state != BT_OPEN) { | |
900 | err = -EBADFD; | |
901 | goto done; | |
902 | } | |
903 | ||
b4324b5d | 904 | if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && |
847641d7 MH |
905 | !capable(CAP_NET_BIND_SERVICE)) { |
906 | err = -EACCES; | |
907 | goto done; | |
908 | } | |
8e87d142 | 909 | |
1da177e4 LT |
910 | write_lock_bh(&l2cap_sk_list.lock); |
911 | ||
f29972de | 912 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
1da177e4 LT |
913 | err = -EADDRINUSE; |
914 | } else { | |
915 | /* Save source address */ | |
f29972de MH |
916 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
917 | l2cap_pi(sk)->psm = la.l2_psm; | |
918 | l2cap_pi(sk)->sport = la.l2_psm; | |
1da177e4 | 919 | sk->sk_state = BT_BOUND; |
2af6b9d5 | 920 | |
b4324b5d MH |
921 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
922 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
2af6b9d5 | 923 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
1da177e4 LT |
924 | } |
925 | ||
926 | write_unlock_bh(&l2cap_sk_list.lock); | |
927 | ||
928 | done: | |
929 | release_sock(sk); | |
930 | return err; | |
931 | } | |
932 | ||
933 | static int l2cap_do_connect(struct sock *sk) | |
934 | { | |
935 | bdaddr_t *src = &bt_sk(sk)->src; | |
936 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
937 | struct l2cap_conn *conn; | |
938 | struct hci_conn *hcon; | |
939 | struct hci_dev *hdev; | |
09ab6f4c | 940 | __u8 auth_type; |
44d0e48e | 941 | int err; |
1da177e4 | 942 | |
f29972de MH |
943 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
944 | l2cap_pi(sk)->psm); | |
1da177e4 | 945 | |
af05b30b GP |
946 | hdev = hci_get_route(dst, src); |
947 | if (!hdev) | |
1da177e4 LT |
948 | return -EHOSTUNREACH; |
949 | ||
950 | hci_dev_lock_bh(hdev); | |
951 | ||
952 | err = -ENOMEM; | |
953 | ||
8c1b2355 | 954 | if (sk->sk_type == SOCK_RAW) { |
2af6b9d5 MH |
955 | switch (l2cap_pi(sk)->sec_level) { |
956 | case BT_SECURITY_HIGH: | |
8c1b2355 | 957 | auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
2af6b9d5 MH |
958 | break; |
959 | case BT_SECURITY_MEDIUM: | |
8c1b2355 | 960 | auth_type = HCI_AT_DEDICATED_BONDING; |
2af6b9d5 MH |
961 | break; |
962 | default: | |
09ab6f4c | 963 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
964 | break; |
965 | } | |
8c1b2355 | 966 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
2af6b9d5 | 967 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8c1b2355 | 968 | auth_type = HCI_AT_NO_BONDING_MITM; |
09ab6f4c | 969 | else |
8c1b2355 | 970 | auth_type = HCI_AT_NO_BONDING; |
435fef20 MH |
971 | |
972 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
973 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
8c1b2355 | 974 | } else { |
2af6b9d5 MH |
975 | switch (l2cap_pi(sk)->sec_level) { |
976 | case BT_SECURITY_HIGH: | |
8c1b2355 | 977 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
2af6b9d5 MH |
978 | break; |
979 | case BT_SECURITY_MEDIUM: | |
09ab6f4c | 980 | auth_type = HCI_AT_GENERAL_BONDING; |
2af6b9d5 MH |
981 | break; |
982 | default: | |
8c1b2355 | 983 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
984 | break; |
985 | } | |
09ab6f4c MH |
986 | } |
987 | ||
2af6b9d5 MH |
988 | hcon = hci_connect(hdev, ACL_LINK, dst, |
989 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
990 | if (!hcon) |
991 | goto done; | |
992 | ||
993 | conn = l2cap_conn_add(hcon, 0); | |
994 | if (!conn) { | |
995 | hci_conn_put(hcon); | |
996 | goto done; | |
997 | } | |
998 | ||
999 | err = 0; | |
1000 | ||
1001 | /* Update source addr of the socket */ | |
1002 | bacpy(src, conn->src); | |
1003 | ||
1004 | l2cap_chan_add(conn, sk, NULL); | |
1005 | ||
1006 | sk->sk_state = BT_CONNECT; | |
1007 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1008 | ||
1009 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
1010 | if (sk->sk_type != SOCK_SEQPACKET && |
1011 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 LT |
1012 | l2cap_sock_clear_timer(sk); |
1013 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
1014 | } else |
1015 | l2cap_do_start(sk); | |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | done: | |
1019 | hci_dev_unlock_bh(hdev); | |
1020 | hci_dev_put(hdev); | |
1021 | return err; | |
1022 | } | |
1023 | ||
1024 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
1025 | { | |
1da177e4 | 1026 | struct sock *sk = sock->sk; |
f29972de MH |
1027 | struct sockaddr_l2 la; |
1028 | int len, err = 0; | |
1da177e4 | 1029 | |
1da177e4 LT |
1030 | BT_DBG("sk %p", sk); |
1031 | ||
6503d961 CG |
1032 | if (!addr || alen < sizeof(addr->sa_family) || |
1033 | addr->sa_family != AF_BLUETOOTH) | |
2a517ca6 | 1034 | return -EINVAL; |
1da177e4 | 1035 | |
f29972de MH |
1036 | memset(&la, 0, sizeof(la)); |
1037 | len = min_t(unsigned int, sizeof(la), alen); | |
1038 | memcpy(&la, addr, len); | |
1039 | ||
2a517ca6 MH |
1040 | if (la.l2_cid) |
1041 | return -EINVAL; | |
1042 | ||
1043 | lock_sock(sk); | |
1044 | ||
bd3c9e25 GP |
1045 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) |
1046 | && !la.l2_psm) { | |
1da177e4 LT |
1047 | err = -EINVAL; |
1048 | goto done; | |
1049 | } | |
1050 | ||
c6b03cf9 MH |
1051 | switch (l2cap_pi(sk)->mode) { |
1052 | case L2CAP_MODE_BASIC: | |
1053 | break; | |
1054 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1055 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1056 | if (enable_ertm) |
1057 | break; | |
1058 | /* fall through */ | |
1059 | default: | |
1060 | err = -ENOTSUPP; | |
1061 | goto done; | |
1062 | } | |
1063 | ||
af05b30b | 1064 | switch (sk->sk_state) { |
1da177e4 LT |
1065 | case BT_CONNECT: |
1066 | case BT_CONNECT2: | |
1067 | case BT_CONFIG: | |
1068 | /* Already connecting */ | |
1069 | goto wait; | |
1070 | ||
1071 | case BT_CONNECTED: | |
1072 | /* Already connected */ | |
1073 | goto done; | |
1074 | ||
1075 | case BT_OPEN: | |
1076 | case BT_BOUND: | |
1077 | /* Can connect */ | |
1078 | break; | |
1079 | ||
1080 | default: | |
1081 | err = -EBADFD; | |
1082 | goto done; | |
1083 | } | |
1084 | ||
1085 | /* Set destination address and psm */ | |
f29972de MH |
1086 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1087 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 1088 | |
af05b30b GP |
1089 | err = l2cap_do_connect(sk); |
1090 | if (err) | |
1da177e4 LT |
1091 | goto done; |
1092 | ||
1093 | wait: | |
1094 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
1095 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
1096 | done: | |
1097 | release_sock(sk); | |
1098 | return err; | |
1099 | } | |
1100 | ||
1101 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
1102 | { | |
1103 | struct sock *sk = sock->sk; | |
1104 | int err = 0; | |
1105 | ||
1106 | BT_DBG("sk %p backlog %d", sk, backlog); | |
1107 | ||
1108 | lock_sock(sk); | |
1109 | ||
bd3c9e25 GP |
1110 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) |
1111 | || sk->sk_state != BT_BOUND) { | |
1da177e4 LT |
1112 | err = -EBADFD; |
1113 | goto done; | |
1114 | } | |
1115 | ||
c6b03cf9 MH |
1116 | switch (l2cap_pi(sk)->mode) { |
1117 | case L2CAP_MODE_BASIC: | |
1118 | break; | |
1119 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1120 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1121 | if (enable_ertm) |
1122 | break; | |
1123 | /* fall through */ | |
1124 | default: | |
1125 | err = -ENOTSUPP; | |
1126 | goto done; | |
1127 | } | |
1128 | ||
1da177e4 LT |
1129 | if (!l2cap_pi(sk)->psm) { |
1130 | bdaddr_t *src = &bt_sk(sk)->src; | |
1131 | u16 psm; | |
1132 | ||
1133 | err = -EINVAL; | |
1134 | ||
1135 | write_lock_bh(&l2cap_sk_list.lock); | |
1136 | ||
1137 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
b4324b5d MH |
1138 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1139 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
1140 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
1da177e4 LT |
1141 | err = 0; |
1142 | break; | |
1143 | } | |
1144 | ||
1145 | write_unlock_bh(&l2cap_sk_list.lock); | |
1146 | ||
1147 | if (err < 0) | |
1148 | goto done; | |
1149 | } | |
1150 | ||
1151 | sk->sk_max_ack_backlog = backlog; | |
1152 | sk->sk_ack_backlog = 0; | |
1153 | sk->sk_state = BT_LISTEN; | |
1154 | ||
1155 | done: | |
1156 | release_sock(sk); | |
1157 | return err; | |
1158 | } | |
1159 | ||
1160 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1161 | { | |
1162 | DECLARE_WAITQUEUE(wait, current); | |
1163 | struct sock *sk = sock->sk, *nsk; | |
1164 | long timeo; | |
1165 | int err = 0; | |
1166 | ||
fcc70d5f | 1167 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1168 | |
1169 | if (sk->sk_state != BT_LISTEN) { | |
1170 | err = -EBADFD; | |
1171 | goto done; | |
1172 | } | |
1173 | ||
1174 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1175 | ||
1176 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1177 | ||
1178 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 1179 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
1da177e4 LT |
1180 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1181 | set_current_state(TASK_INTERRUPTIBLE); | |
1182 | if (!timeo) { | |
1183 | err = -EAGAIN; | |
1184 | break; | |
1185 | } | |
1186 | ||
1187 | release_sock(sk); | |
1188 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1189 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1190 | |
1191 | if (sk->sk_state != BT_LISTEN) { | |
1192 | err = -EBADFD; | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | if (signal_pending(current)) { | |
1197 | err = sock_intr_errno(timeo); | |
1198 | break; | |
1199 | } | |
1200 | } | |
1201 | set_current_state(TASK_RUNNING); | |
aa395145 | 1202 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
1203 | |
1204 | if (err) | |
1205 | goto done; | |
1206 | ||
1207 | newsock->state = SS_CONNECTED; | |
1208 | ||
1209 | BT_DBG("new socket %p", nsk); | |
1210 | ||
1211 | done: | |
1212 | release_sock(sk); | |
1213 | return err; | |
1214 | } | |
1215 | ||
1216 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
1217 | { | |
1218 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1219 | struct sock *sk = sock->sk; | |
1220 | ||
1221 | BT_DBG("sock %p, sk %p", sock, sk); | |
1222 | ||
1223 | addr->sa_family = AF_BLUETOOTH; | |
1224 | *len = sizeof(struct sockaddr_l2); | |
1225 | ||
f29972de MH |
1226 | if (peer) { |
1227 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1228 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1229 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1230 | } else { |
1231 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1232 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1233 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1234 | } |
1da177e4 | 1235 | |
1da177e4 LT |
1236 | return 0; |
1237 | } | |
1238 | ||
e90bac06 GP |
1239 | static void l2cap_monitor_timeout(unsigned long arg) |
1240 | { | |
1241 | struct sock *sk = (void *) arg; | |
e90bac06 | 1242 | |
e686219a | 1243 | bh_lock_sock(sk); |
e90bac06 GP |
1244 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
1245 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk); | |
b13f5860 | 1246 | bh_unlock_sock(sk); |
e90bac06 GP |
1247 | return; |
1248 | } | |
1249 | ||
1250 | l2cap_pi(sk)->retry_count++; | |
1251 | __mod_monitor_timer(); | |
1252 | ||
a2e12a2a | 1253 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1254 | bh_unlock_sock(sk); |
e90bac06 GP |
1255 | } |
1256 | ||
1257 | static void l2cap_retrans_timeout(unsigned long arg) | |
1258 | { | |
1259 | struct sock *sk = (void *) arg; | |
e90bac06 | 1260 | |
e686219a | 1261 | bh_lock_sock(sk); |
e90bac06 GP |
1262 | l2cap_pi(sk)->retry_count = 1; |
1263 | __mod_monitor_timer(); | |
1264 | ||
1265 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
1266 | ||
a2e12a2a | 1267 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1268 | bh_unlock_sock(sk); |
e90bac06 GP |
1269 | } |
1270 | ||
1c2acffb | 1271 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 1272 | { |
1c2acffb | 1273 | struct sk_buff *skb; |
1da177e4 | 1274 | |
812e737e GP |
1275 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
1276 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
1277 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1278 | break; | |
1da177e4 | 1279 | |
1c2acffb GP |
1280 | skb = skb_dequeue(TX_QUEUE(sk)); |
1281 | kfree_skb(skb); | |
1da177e4 | 1282 | |
1c2acffb GP |
1283 | l2cap_pi(sk)->unacked_frames--; |
1284 | } | |
1da177e4 | 1285 | |
e90bac06 GP |
1286 | if (!l2cap_pi(sk)->unacked_frames) |
1287 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1288 | ||
1c2acffb GP |
1289 | return; |
1290 | } | |
1da177e4 | 1291 | |
9a9c6a34 | 1292 | static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1293 | { |
1294 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1c2acffb GP |
1295 | |
1296 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1297 | |
9a9c6a34 | 1298 | hci_send_acl(pi->conn->hcon, skb, 0); |
1c2acffb GP |
1299 | } |
1300 | ||
6840ed07 GP |
1301 | static int l2cap_streaming_send(struct sock *sk) |
1302 | { | |
1303 | struct sk_buff *skb, *tx_skb; | |
1304 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1305 | u16 control, fcs; |
6840ed07 GP |
1306 | |
1307 | while ((skb = sk->sk_send_head)) { | |
1308 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1309 | ||
1310 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
1311 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; | |
1312 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1313 | ||
e8235c6b | 1314 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1315 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1316 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1317 | } | |
1318 | ||
9a9c6a34 | 1319 | l2cap_do_send(sk, tx_skb); |
6840ed07 GP |
1320 | |
1321 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1322 | ||
1323 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1324 | sk->sk_send_head = NULL; | |
1325 | else | |
1326 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
1327 | ||
1328 | skb = skb_dequeue(TX_QUEUE(sk)); | |
1329 | kfree_skb(skb); | |
1330 | } | |
1331 | return 0; | |
1332 | } | |
1333 | ||
8f17154f GP |
1334 | static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq) |
1335 | { | |
1336 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1337 | struct sk_buff *skb, *tx_skb; | |
1338 | u16 control, fcs; | |
8f17154f GP |
1339 | |
1340 | skb = skb_peek(TX_QUEUE(sk)); | |
1341 | do { | |
1342 | if (bt_cb(skb)->tx_seq != tx_seq) { | |
1343 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1344 | break; | |
1345 | skb = skb_queue_next(TX_QUEUE(sk), skb); | |
1346 | continue; | |
1347 | } | |
1348 | ||
1349 | if (pi->remote_max_tx && | |
1350 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
1351 | l2cap_send_disconn_req(pi->conn, sk); | |
1352 | break; | |
1353 | } | |
1354 | ||
1355 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1356 | bt_cb(skb)->retries++; | |
1357 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
9f121a5a | 1358 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
8f17154f GP |
1359 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1360 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1361 | ||
e8235c6b | 1362 | if (pi->fcs == L2CAP_FCS_CRC16) { |
8f17154f GP |
1363 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1364 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1365 | } | |
1366 | ||
9a9c6a34 | 1367 | l2cap_do_send(sk, tx_skb); |
8f17154f GP |
1368 | break; |
1369 | } while(1); | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1c2acffb GP |
1373 | static int l2cap_ertm_send(struct sock *sk) |
1374 | { | |
1375 | struct sk_buff *skb, *tx_skb; | |
1376 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1377 | u16 control, fcs; |
9a9c6a34 | 1378 | int nsent = 0; |
1c2acffb | 1379 | |
e90bac06 GP |
1380 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
1381 | return 0; | |
1382 | ||
f64f9e71 | 1383 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) && |
59203a21 | 1384 | !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) { |
1c2acffb | 1385 | |
e90bac06 GP |
1386 | if (pi->remote_max_tx && |
1387 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
1388 | l2cap_send_disconn_req(pi->conn, sk); | |
1389 | break; | |
1390 | } | |
1391 | ||
e420aba3 AE |
1392 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1393 | ||
e90bac06 GP |
1394 | bt_cb(skb)->retries++; |
1395 | ||
1c2acffb | 1396 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
d5392c8f GP |
1397 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1398 | control |= L2CAP_CTRL_FINAL; | |
1399 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1400 | } | |
9f121a5a | 1401 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1402 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1403 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1404 | ||
e90bac06 | 1405 | |
e8235c6b | 1406 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1407 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1408 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1409 | } | |
1410 | ||
9a9c6a34 GP |
1411 | l2cap_do_send(sk, tx_skb); |
1412 | ||
e90bac06 | 1413 | __mod_retrans_timer(); |
1c2acffb GP |
1414 | |
1415 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1416 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1417 | ||
1418 | pi->unacked_frames++; | |
d5392c8f | 1419 | pi->frames_sent++; |
1c2acffb GP |
1420 | |
1421 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1422 | sk->sk_send_head = NULL; | |
1423 | else | |
1424 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1425 | |
1426 | nsent++; | |
1c2acffb GP |
1427 | } |
1428 | ||
9e917af1 GP |
1429 | return nsent; |
1430 | } | |
1431 | ||
9a9c6a34 | 1432 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1433 | { |
1434 | struct sock *sk = (struct sock *)pi; | |
1435 | u16 control = 0; | |
1436 | ||
1437 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1438 | ||
1439 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1440 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
9a9c6a34 GP |
1441 | l2cap_send_sframe(pi, control); |
1442 | return; | |
9e917af1 GP |
1443 | } else if (l2cap_ertm_send(sk) == 0) { |
1444 | control |= L2CAP_SUPER_RCV_READY; | |
9a9c6a34 | 1445 | l2cap_send_sframe(pi, control); |
9e917af1 | 1446 | } |
1c2acffb GP |
1447 | } |
1448 | ||
9a9c6a34 | 1449 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1450 | { |
1451 | struct srej_list *tail; | |
1452 | u16 control; | |
1453 | ||
1454 | control = L2CAP_SUPER_SELECT_REJECT; | |
1455 | control |= L2CAP_CTRL_FINAL; | |
1456 | ||
1457 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1458 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1459 | ||
1460 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1461 | } |
1462 | ||
1c2acffb GP |
1463 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1464 | { | |
1465 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1466 | struct sk_buff **frag; | |
1467 | int err, sent = 0; | |
1da177e4 | 1468 | |
59203a21 | 1469 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1470 | return -EFAULT; |
1da177e4 LT |
1471 | |
1472 | sent += count; | |
1473 | len -= count; | |
1474 | ||
1475 | /* Continuation fragments (no L2CAP header) */ | |
1476 | frag = &skb_shinfo(skb)->frag_list; | |
1477 | while (len) { | |
1478 | count = min_t(unsigned int, conn->mtu, len); | |
1479 | ||
1480 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1481 | if (!*frag) | |
1c2acffb GP |
1482 | return -EFAULT; |
1483 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) | |
1484 | return -EFAULT; | |
1da177e4 LT |
1485 | |
1486 | sent += count; | |
1487 | len -= count; | |
1488 | ||
1489 | frag = &(*frag)->next; | |
1490 | } | |
1da177e4 LT |
1491 | |
1492 | return sent; | |
1c2acffb | 1493 | } |
1da177e4 | 1494 | |
1c2acffb GP |
1495 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1496 | { | |
1497 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1498 | struct sk_buff *skb; | |
1499 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1500 | struct l2cap_hdr *lh; | |
1501 | ||
1502 | BT_DBG("sk %p len %d", sk, (int)len); | |
1503 | ||
1504 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1505 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1506 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1507 | if (!skb) | |
1508 | return ERR_PTR(-ENOMEM); | |
1509 | ||
1510 | /* Create L2CAP header */ | |
1511 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1512 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1513 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1514 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1515 | ||
1516 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1517 | if (unlikely(err < 0)) { | |
1518 | kfree_skb(skb); | |
1519 | return ERR_PTR(err); | |
1520 | } | |
1521 | return skb; | |
1522 | } | |
1523 | ||
1524 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) | |
1525 | { | |
1526 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1527 | struct sk_buff *skb; | |
1528 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1529 | struct l2cap_hdr *lh; | |
1530 | ||
1531 | BT_DBG("sk %p len %d", sk, (int)len); | |
1532 | ||
1533 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1534 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1535 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1536 | if (!skb) | |
1537 | return ERR_PTR(-ENOMEM); | |
1538 | ||
1539 | /* Create L2CAP header */ | |
1540 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1541 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1542 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1543 | ||
1544 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1545 | if (unlikely(err < 0)) { | |
1546 | kfree_skb(skb); | |
1547 | return ERR_PTR(err); | |
1548 | } | |
1549 | return skb; | |
1550 | } | |
1551 | ||
6840ed07 | 1552 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1553 | { |
1554 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1555 | struct sk_buff *skb; | |
1556 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1557 | struct l2cap_hdr *lh; | |
1558 | ||
1559 | BT_DBG("sk %p len %d", sk, (int)len); | |
1560 | ||
0ee0d208 GP |
1561 | if (!conn) |
1562 | return ERR_PTR(-ENOTCONN); | |
1563 | ||
c74e560c GP |
1564 | if (sdulen) |
1565 | hlen += 2; | |
1566 | ||
fcc203c3 GP |
1567 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1568 | hlen += 2; | |
1569 | ||
1c2acffb GP |
1570 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1571 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1572 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1573 | if (!skb) | |
1574 | return ERR_PTR(-ENOMEM); | |
1575 | ||
1576 | /* Create L2CAP header */ | |
1577 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1578 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1579 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1580 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1581 | if (sdulen) |
1582 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1583 | |
1584 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1585 | if (unlikely(err < 0)) { | |
1586 | kfree_skb(skb); | |
1587 | return ERR_PTR(err); | |
1588 | } | |
e90bac06 | 1589 | |
fcc203c3 GP |
1590 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1591 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1592 | ||
e90bac06 | 1593 | bt_cb(skb)->retries = 0; |
1c2acffb | 1594 | return skb; |
1da177e4 LT |
1595 | } |
1596 | ||
c74e560c GP |
1597 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1598 | { | |
1599 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1600 | struct sk_buff *skb; | |
1601 | struct sk_buff_head sar_queue; | |
1602 | u16 control; | |
1603 | size_t size = 0; | |
1604 | ||
ff12fd64 | 1605 | skb_queue_head_init(&sar_queue); |
c74e560c | 1606 | control = L2CAP_SDU_START; |
1c762159 | 1607 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1608 | if (IS_ERR(skb)) |
1609 | return PTR_ERR(skb); | |
1610 | ||
1611 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1612 | len -= pi->remote_mps; |
1613 | size += pi->remote_mps; | |
c74e560c GP |
1614 | |
1615 | while (len > 0) { | |
1616 | size_t buflen; | |
1617 | ||
1c762159 | 1618 | if (len > pi->remote_mps) { |
44651b85 | 1619 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1620 | buflen = pi->remote_mps; |
c74e560c | 1621 | } else { |
44651b85 | 1622 | control = L2CAP_SDU_END; |
c74e560c GP |
1623 | buflen = len; |
1624 | } | |
1625 | ||
6840ed07 | 1626 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1627 | if (IS_ERR(skb)) { |
1628 | skb_queue_purge(&sar_queue); | |
1629 | return PTR_ERR(skb); | |
1630 | } | |
1631 | ||
1632 | __skb_queue_tail(&sar_queue, skb); | |
1633 | len -= buflen; | |
1634 | size += buflen; | |
c74e560c GP |
1635 | } |
1636 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1637 | if (sk->sk_send_head == NULL) | |
1638 | sk->sk_send_head = sar_queue.next; | |
1639 | ||
1640 | return size; | |
1641 | } | |
1642 | ||
1da177e4 LT |
1643 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1644 | { | |
1645 | struct sock *sk = sock->sk; | |
1c2acffb GP |
1646 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1647 | struct sk_buff *skb; | |
1648 | u16 control; | |
1649 | int err; | |
1da177e4 LT |
1650 | |
1651 | BT_DBG("sock %p, sk %p", sock, sk); | |
1652 | ||
c1cbe4b7 BL |
1653 | err = sock_error(sk); |
1654 | if (err) | |
1655 | return err; | |
1da177e4 LT |
1656 | |
1657 | if (msg->msg_flags & MSG_OOB) | |
1658 | return -EOPNOTSUPP; | |
1659 | ||
1da177e4 LT |
1660 | lock_sock(sk); |
1661 | ||
1c2acffb | 1662 | if (sk->sk_state != BT_CONNECTED) { |
1da177e4 | 1663 | err = -ENOTCONN; |
1c2acffb GP |
1664 | goto done; |
1665 | } | |
1da177e4 | 1666 | |
1c2acffb GP |
1667 | /* Connectionless channel */ |
1668 | if (sk->sk_type == SOCK_DGRAM) { | |
1669 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
9a9c6a34 | 1670 | if (IS_ERR(skb)) { |
477fffb0 | 1671 | err = PTR_ERR(skb); |
9a9c6a34 GP |
1672 | } else { |
1673 | l2cap_do_send(sk, skb); | |
1674 | err = len; | |
1675 | } | |
1c2acffb GP |
1676 | goto done; |
1677 | } | |
1678 | ||
1679 | switch (pi->mode) { | |
1680 | case L2CAP_MODE_BASIC: | |
c69163e9 GP |
1681 | /* Check outgoing MTU */ |
1682 | if (len > pi->omtu) { | |
1683 | err = -EINVAL; | |
1684 | goto done; | |
1685 | } | |
1686 | ||
1c2acffb GP |
1687 | /* Create a basic PDU */ |
1688 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
1689 | if (IS_ERR(skb)) { | |
1690 | err = PTR_ERR(skb); | |
1691 | goto done; | |
1692 | } | |
1693 | ||
9a9c6a34 GP |
1694 | l2cap_do_send(sk, skb); |
1695 | err = len; | |
1c2acffb GP |
1696 | break; |
1697 | ||
1698 | case L2CAP_MODE_ERTM: | |
6840ed07 | 1699 | case L2CAP_MODE_STREAMING: |
1c2acffb | 1700 | /* Entire SDU fits into one PDU */ |
1c762159 | 1701 | if (len <= pi->remote_mps) { |
1c2acffb | 1702 | control = L2CAP_SDU_UNSEGMENTED; |
6840ed07 | 1703 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1c2acffb GP |
1704 | if (IS_ERR(skb)) { |
1705 | err = PTR_ERR(skb); | |
1706 | goto done; | |
1707 | } | |
c74e560c GP |
1708 | __skb_queue_tail(TX_QUEUE(sk), skb); |
1709 | if (sk->sk_send_head == NULL) | |
1710 | sk->sk_send_head = skb; | |
1c2acffb | 1711 | } else { |
c74e560c GP |
1712 | /* Segment SDU into multiples PDUs */ |
1713 | err = l2cap_sar_segment_sdu(sk, msg, len); | |
1714 | if (err < 0) | |
1715 | goto done; | |
1c2acffb | 1716 | } |
1c2acffb | 1717 | |
6840ed07 GP |
1718 | if (pi->mode == L2CAP_MODE_STREAMING) |
1719 | err = l2cap_streaming_send(sk); | |
1720 | else | |
1721 | err = l2cap_ertm_send(sk); | |
1722 | ||
9e917af1 | 1723 | if (err >= 0) |
1c2acffb GP |
1724 | err = len; |
1725 | break; | |
1726 | ||
1727 | default: | |
1728 | BT_DBG("bad state %1.1x", pi->mode); | |
1729 | err = -EINVAL; | |
1730 | } | |
1731 | ||
1732 | done: | |
1da177e4 LT |
1733 | release_sock(sk); |
1734 | return err; | |
1735 | } | |
1736 | ||
f66dc81f MH |
1737 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1738 | { | |
1739 | struct sock *sk = sock->sk; | |
1740 | ||
1741 | lock_sock(sk); | |
1742 | ||
1743 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1744 | struct l2cap_conn_rsp rsp; | |
1745 | ||
1746 | sk->sk_state = BT_CONFIG; | |
1747 | ||
1748 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1749 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1750 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1751 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1752 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1753 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1754 | ||
1755 | release_sock(sk); | |
1756 | return 0; | |
1757 | } | |
1758 | ||
1759 | release_sock(sk); | |
1760 | ||
1761 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); | |
1762 | } | |
1763 | ||
b7058842 | 1764 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1765 | { |
1766 | struct sock *sk = sock->sk; | |
1767 | struct l2cap_options opts; | |
f29972de | 1768 | int len, err = 0; |
1da177e4 LT |
1769 | u32 opt; |
1770 | ||
1771 | BT_DBG("sk %p", sk); | |
1772 | ||
1773 | lock_sock(sk); | |
1774 | ||
1775 | switch (optname) { | |
1776 | case L2CAP_OPTIONS: | |
0878b666 MH |
1777 | opts.imtu = l2cap_pi(sk)->imtu; |
1778 | opts.omtu = l2cap_pi(sk)->omtu; | |
1779 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1780 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1781 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1782 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1783 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
0878b666 | 1784 | |
1da177e4 LT |
1785 | len = min_t(unsigned int, sizeof(opts), optlen); |
1786 | if (copy_from_user((char *) &opts, optval, len)) { | |
1787 | err = -EFAULT; | |
1788 | break; | |
1789 | } | |
0878b666 | 1790 | |
0041ecfa JPRV |
1791 | l2cap_pi(sk)->mode = opts.mode; |
1792 | switch (l2cap_pi(sk)->mode) { | |
1793 | case L2CAP_MODE_BASIC: | |
1794 | break; | |
1795 | case L2CAP_MODE_ERTM: | |
1796 | case L2CAP_MODE_STREAMING: | |
1797 | if (enable_ertm) | |
1798 | break; | |
1799 | /* fall through */ | |
1800 | default: | |
1801 | err = -EINVAL; | |
1802 | break; | |
1803 | } | |
1804 | ||
c6b03cf9 MH |
1805 | l2cap_pi(sk)->imtu = opts.imtu; |
1806 | l2cap_pi(sk)->omtu = opts.omtu; | |
fcc203c3 | 1807 | l2cap_pi(sk)->fcs = opts.fcs; |
68d7f0ce | 1808 | l2cap_pi(sk)->max_tx = opts.max_tx; |
14b5aa71 | 1809 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; |
1da177e4 LT |
1810 | break; |
1811 | ||
1812 | case L2CAP_LM: | |
1813 | if (get_user(opt, (u32 __user *) optval)) { | |
1814 | err = -EFAULT; | |
1815 | break; | |
1816 | } | |
1817 | ||
2af6b9d5 MH |
1818 | if (opt & L2CAP_LM_AUTH) |
1819 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
1820 | if (opt & L2CAP_LM_ENCRYPT) | |
1821 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
1822 | if (opt & L2CAP_LM_SECURE) | |
1823 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
1824 | ||
1825 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
1826 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
1827 | break; |
1828 | ||
1829 | default: | |
1830 | err = -ENOPROTOOPT; | |
1831 | break; | |
1832 | } | |
1833 | ||
1834 | release_sock(sk); | |
1835 | return err; | |
1836 | } | |
1837 | ||
b7058842 | 1838 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
1839 | { |
1840 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
1841 | struct bt_security sec; |
1842 | int len, err = 0; | |
f66dc81f | 1843 | u32 opt; |
d58daf42 MH |
1844 | |
1845 | BT_DBG("sk %p", sk); | |
1846 | ||
1847 | if (level == SOL_L2CAP) | |
1848 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
1849 | ||
0588d94f MH |
1850 | if (level != SOL_BLUETOOTH) |
1851 | return -ENOPROTOOPT; | |
1852 | ||
d58daf42 MH |
1853 | lock_sock(sk); |
1854 | ||
1855 | switch (optname) { | |
2af6b9d5 | 1856 | case BT_SECURITY: |
bd3c9e25 GP |
1857 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
1858 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
1859 | err = -EINVAL; |
1860 | break; | |
1861 | } | |
1862 | ||
2af6b9d5 MH |
1863 | sec.level = BT_SECURITY_LOW; |
1864 | ||
1865 | len = min_t(unsigned int, sizeof(sec), optlen); | |
1866 | if (copy_from_user((char *) &sec, optval, len)) { | |
1867 | err = -EFAULT; | |
1868 | break; | |
1869 | } | |
1870 | ||
1871 | if (sec.level < BT_SECURITY_LOW || | |
1872 | sec.level > BT_SECURITY_HIGH) { | |
1873 | err = -EINVAL; | |
1874 | break; | |
1875 | } | |
1876 | ||
1877 | l2cap_pi(sk)->sec_level = sec.level; | |
1878 | break; | |
1879 | ||
f66dc81f MH |
1880 | case BT_DEFER_SETUP: |
1881 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
1882 | err = -EINVAL; | |
1883 | break; | |
1884 | } | |
1885 | ||
1886 | if (get_user(opt, (u32 __user *) optval)) { | |
1887 | err = -EFAULT; | |
1888 | break; | |
1889 | } | |
1890 | ||
1891 | bt_sk(sk)->defer_setup = opt; | |
1892 | break; | |
1893 | ||
d58daf42 MH |
1894 | default: |
1895 | err = -ENOPROTOOPT; | |
1896 | break; | |
1897 | } | |
1898 | ||
1899 | release_sock(sk); | |
1900 | return err; | |
1901 | } | |
1902 | ||
1903 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
1904 | { |
1905 | struct sock *sk = sock->sk; | |
1906 | struct l2cap_options opts; | |
1907 | struct l2cap_conninfo cinfo; | |
1908 | int len, err = 0; | |
2af6b9d5 | 1909 | u32 opt; |
1da177e4 LT |
1910 | |
1911 | BT_DBG("sk %p", sk); | |
1912 | ||
1913 | if (get_user(len, optlen)) | |
1914 | return -EFAULT; | |
1915 | ||
1916 | lock_sock(sk); | |
1917 | ||
1918 | switch (optname) { | |
1919 | case L2CAP_OPTIONS: | |
1920 | opts.imtu = l2cap_pi(sk)->imtu; | |
1921 | opts.omtu = l2cap_pi(sk)->omtu; | |
1922 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1923 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1924 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1925 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1926 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
1da177e4 LT |
1927 | |
1928 | len = min_t(unsigned int, len, sizeof(opts)); | |
1929 | if (copy_to_user(optval, (char *) &opts, len)) | |
1930 | err = -EFAULT; | |
1931 | ||
1932 | break; | |
1933 | ||
1934 | case L2CAP_LM: | |
2af6b9d5 MH |
1935 | switch (l2cap_pi(sk)->sec_level) { |
1936 | case BT_SECURITY_LOW: | |
1937 | opt = L2CAP_LM_AUTH; | |
1938 | break; | |
1939 | case BT_SECURITY_MEDIUM: | |
1940 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
1941 | break; | |
1942 | case BT_SECURITY_HIGH: | |
1943 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
1944 | L2CAP_LM_SECURE; | |
1945 | break; | |
1946 | default: | |
1947 | opt = 0; | |
1948 | break; | |
1949 | } | |
1950 | ||
1951 | if (l2cap_pi(sk)->role_switch) | |
1952 | opt |= L2CAP_LM_MASTER; | |
1953 | ||
1954 | if (l2cap_pi(sk)->force_reliable) | |
1955 | opt |= L2CAP_LM_RELIABLE; | |
1956 | ||
1957 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
1958 | err = -EFAULT; |
1959 | break; | |
1960 | ||
1961 | case L2CAP_CONNINFO: | |
f66dc81f MH |
1962 | if (sk->sk_state != BT_CONNECTED && |
1963 | !(sk->sk_state == BT_CONNECT2 && | |
1964 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
1965 | err = -ENOTCONN; |
1966 | break; | |
1967 | } | |
1968 | ||
1969 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
1970 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
1971 | ||
1972 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
1973 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
1974 | err = -EFAULT; | |
1975 | ||
1976 | break; | |
1977 | ||
1978 | default: | |
1979 | err = -ENOPROTOOPT; | |
1980 | break; | |
1981 | } | |
1982 | ||
1983 | release_sock(sk); | |
1984 | return err; | |
1985 | } | |
1986 | ||
d58daf42 MH |
1987 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
1988 | { | |
1989 | struct sock *sk = sock->sk; | |
2af6b9d5 | 1990 | struct bt_security sec; |
d58daf42 MH |
1991 | int len, err = 0; |
1992 | ||
1993 | BT_DBG("sk %p", sk); | |
1994 | ||
1995 | if (level == SOL_L2CAP) | |
1996 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
1997 | ||
0588d94f MH |
1998 | if (level != SOL_BLUETOOTH) |
1999 | return -ENOPROTOOPT; | |
2000 | ||
d58daf42 MH |
2001 | if (get_user(len, optlen)) |
2002 | return -EFAULT; | |
2003 | ||
2004 | lock_sock(sk); | |
2005 | ||
2006 | switch (optname) { | |
2af6b9d5 | 2007 | case BT_SECURITY: |
bd3c9e25 GP |
2008 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2009 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2010 | err = -EINVAL; |
2011 | break; | |
2012 | } | |
2013 | ||
2af6b9d5 MH |
2014 | sec.level = l2cap_pi(sk)->sec_level; |
2015 | ||
2016 | len = min_t(unsigned int, len, sizeof(sec)); | |
2017 | if (copy_to_user(optval, (char *) &sec, len)) | |
2018 | err = -EFAULT; | |
2019 | ||
2020 | break; | |
2021 | ||
f66dc81f MH |
2022 | case BT_DEFER_SETUP: |
2023 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2024 | err = -EINVAL; | |
2025 | break; | |
2026 | } | |
2027 | ||
2028 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
2029 | err = -EFAULT; | |
2030 | ||
2031 | break; | |
2032 | ||
d58daf42 MH |
2033 | default: |
2034 | err = -ENOPROTOOPT; | |
2035 | break; | |
2036 | } | |
2037 | ||
2038 | release_sock(sk); | |
2039 | return err; | |
2040 | } | |
2041 | ||
1da177e4 LT |
2042 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
2043 | { | |
2044 | struct sock *sk = sock->sk; | |
2045 | int err = 0; | |
2046 | ||
2047 | BT_DBG("sock %p, sk %p", sock, sk); | |
2048 | ||
2049 | if (!sk) | |
2050 | return 0; | |
2051 | ||
2052 | lock_sock(sk); | |
2053 | if (!sk->sk_shutdown) { | |
2054 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2055 | l2cap_sock_clear_timer(sk); | |
2056 | __l2cap_sock_close(sk, 0); | |
2057 | ||
2058 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
2059 | err = bt_sock_wait_state(sk, BT_CLOSED, |
2060 | sk->sk_lingertime); | |
1da177e4 LT |
2061 | } |
2062 | release_sock(sk); | |
2063 | return err; | |
2064 | } | |
2065 | ||
2066 | static int l2cap_sock_release(struct socket *sock) | |
2067 | { | |
2068 | struct sock *sk = sock->sk; | |
2069 | int err; | |
2070 | ||
2071 | BT_DBG("sock %p, sk %p", sock, sk); | |
2072 | ||
2073 | if (!sk) | |
2074 | return 0; | |
2075 | ||
2076 | err = l2cap_sock_shutdown(sock, 2); | |
2077 | ||
2078 | sock_orphan(sk); | |
2079 | l2cap_sock_kill(sk); | |
2080 | return err; | |
2081 | } | |
2082 | ||
1da177e4 LT |
2083 | static void l2cap_chan_ready(struct sock *sk) |
2084 | { | |
2085 | struct sock *parent = bt_sk(sk)->parent; | |
2086 | ||
2087 | BT_DBG("sk %p, parent %p", sk, parent); | |
2088 | ||
2089 | l2cap_pi(sk)->conf_state = 0; | |
2090 | l2cap_sock_clear_timer(sk); | |
2091 | ||
2092 | if (!parent) { | |
2093 | /* Outgoing channel. | |
2094 | * Wake up socket sleeping on connect. | |
2095 | */ | |
2096 | sk->sk_state = BT_CONNECTED; | |
2097 | sk->sk_state_change(sk); | |
2098 | } else { | |
2099 | /* Incoming channel. | |
2100 | * Wake up socket sleeping on accept. | |
2101 | */ | |
2102 | parent->sk_data_ready(parent, 0); | |
2103 | } | |
2104 | } | |
2105 | ||
2106 | /* Copy frame to all raw sockets on that connection */ | |
2107 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2108 | { | |
2109 | struct l2cap_chan_list *l = &conn->chan_list; | |
2110 | struct sk_buff *nskb; | |
af05b30b | 2111 | struct sock *sk; |
1da177e4 LT |
2112 | |
2113 | BT_DBG("conn %p", conn); | |
2114 | ||
2115 | read_lock(&l->lock); | |
2116 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2117 | if (sk->sk_type != SOCK_RAW) | |
2118 | continue; | |
2119 | ||
2120 | /* Don't send frame to the socket it came from */ | |
2121 | if (skb->sk == sk) | |
2122 | continue; | |
af05b30b GP |
2123 | nskb = skb_clone(skb, GFP_ATOMIC); |
2124 | if (!nskb) | |
1da177e4 LT |
2125 | continue; |
2126 | ||
2127 | if (sock_queue_rcv_skb(sk, nskb)) | |
2128 | kfree_skb(nskb); | |
2129 | } | |
2130 | read_unlock(&l->lock); | |
2131 | } | |
2132 | ||
2133 | /* ---- L2CAP signalling commands ---- */ | |
2134 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2135 | u8 code, u8 ident, u16 dlen, void *data) | |
2136 | { | |
2137 | struct sk_buff *skb, **frag; | |
2138 | struct l2cap_cmd_hdr *cmd; | |
2139 | struct l2cap_hdr *lh; | |
2140 | int len, count; | |
2141 | ||
af05b30b GP |
2142 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2143 | conn, code, ident, dlen); | |
1da177e4 LT |
2144 | |
2145 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2146 | count = min_t(unsigned int, conn->mtu, len); | |
2147 | ||
2148 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2149 | if (!skb) | |
2150 | return NULL; | |
2151 | ||
2152 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2153 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 2154 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2155 | |
2156 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2157 | cmd->code = code; | |
2158 | cmd->ident = ident; | |
aca3192c | 2159 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2160 | |
2161 | if (dlen) { | |
2162 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2163 | memcpy(skb_put(skb, count), data, count); | |
2164 | data += count; | |
2165 | } | |
2166 | ||
2167 | len -= skb->len; | |
2168 | ||
2169 | /* Continuation fragments (no L2CAP header) */ | |
2170 | frag = &skb_shinfo(skb)->frag_list; | |
2171 | while (len) { | |
2172 | count = min_t(unsigned int, conn->mtu, len); | |
2173 | ||
2174 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2175 | if (!*frag) | |
2176 | goto fail; | |
2177 | ||
2178 | memcpy(skb_put(*frag, count), data, count); | |
2179 | ||
2180 | len -= count; | |
2181 | data += count; | |
2182 | ||
2183 | frag = &(*frag)->next; | |
2184 | } | |
2185 | ||
2186 | return skb; | |
2187 | ||
2188 | fail: | |
2189 | kfree_skb(skb); | |
2190 | return NULL; | |
2191 | } | |
2192 | ||
2193 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2194 | { | |
2195 | struct l2cap_conf_opt *opt = *ptr; | |
2196 | int len; | |
2197 | ||
2198 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2199 | *ptr += len; | |
2200 | ||
2201 | *type = opt->type; | |
2202 | *olen = opt->len; | |
2203 | ||
2204 | switch (opt->len) { | |
2205 | case 1: | |
2206 | *val = *((u8 *) opt->val); | |
2207 | break; | |
2208 | ||
2209 | case 2: | |
861d6882 | 2210 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
2211 | break; |
2212 | ||
2213 | case 4: | |
861d6882 | 2214 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
2215 | break; |
2216 | ||
2217 | default: | |
2218 | *val = (unsigned long) opt->val; | |
2219 | break; | |
2220 | } | |
2221 | ||
2222 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2223 | return len; | |
2224 | } | |
2225 | ||
1da177e4 LT |
2226 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2227 | { | |
2228 | struct l2cap_conf_opt *opt = *ptr; | |
2229 | ||
2230 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2231 | ||
2232 | opt->type = type; | |
2233 | opt->len = len; | |
2234 | ||
2235 | switch (len) { | |
2236 | case 1: | |
2237 | *((u8 *) opt->val) = val; | |
2238 | break; | |
2239 | ||
2240 | case 2: | |
8e036fc3 | 2241 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
2242 | break; |
2243 | ||
2244 | case 4: | |
8e036fc3 | 2245 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
2246 | break; |
2247 | ||
2248 | default: | |
2249 | memcpy(opt->val, (void *) val, len); | |
2250 | break; | |
2251 | } | |
2252 | ||
2253 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2254 | } | |
2255 | ||
c1b4f43b GP |
2256 | static void l2cap_ack_timeout(unsigned long arg) |
2257 | { | |
2258 | struct sock *sk = (void *) arg; | |
2259 | ||
2260 | bh_lock_sock(sk); | |
2261 | l2cap_send_ack(l2cap_pi(sk)); | |
2262 | bh_unlock_sock(sk); | |
2263 | } | |
2264 | ||
0565c1c2 GP |
2265 | static inline void l2cap_ertm_init(struct sock *sk) |
2266 | { | |
2267 | l2cap_pi(sk)->expected_ack_seq = 0; | |
2268 | l2cap_pi(sk)->unacked_frames = 0; | |
2269 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 2270 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 2271 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
2272 | |
2273 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
2274 | l2cap_retrans_timeout, (unsigned long) sk); | |
2275 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
2276 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
2277 | setup_timer(&l2cap_pi(sk)->ack_timer, |
2278 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
2279 | |
2280 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
2281 | } | |
2282 | ||
f2fcfcd6 GP |
2283 | static int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
2284 | { | |
2285 | u32 local_feat_mask = l2cap_feat_mask; | |
2286 | if (enable_ertm) | |
6840ed07 | 2287 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
f2fcfcd6 GP |
2288 | |
2289 | switch (mode) { | |
2290 | case L2CAP_MODE_ERTM: | |
2291 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
2292 | case L2CAP_MODE_STREAMING: | |
2293 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
2294 | default: | |
2295 | return 0x00; | |
2296 | } | |
2297 | } | |
2298 | ||
2299 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) | |
2300 | { | |
2301 | switch (mode) { | |
2302 | case L2CAP_MODE_STREAMING: | |
2303 | case L2CAP_MODE_ERTM: | |
2304 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2305 | return mode; | |
2306 | /* fall through */ | |
2307 | default: | |
2308 | return L2CAP_MODE_BASIC; | |
2309 | } | |
2310 | } | |
2311 | ||
1da177e4 LT |
2312 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2313 | { | |
2314 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2315 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 2316 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
2317 | void *ptr = req->data; |
2318 | ||
2319 | BT_DBG("sk %p", sk); | |
2320 | ||
f2fcfcd6 GP |
2321 | if (pi->num_conf_req || pi->num_conf_rsp) |
2322 | goto done; | |
2323 | ||
2324 | switch (pi->mode) { | |
2325 | case L2CAP_MODE_STREAMING: | |
2326 | case L2CAP_MODE_ERTM: | |
2327 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; | |
22121fc9 GP |
2328 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
2329 | l2cap_send_disconn_req(pi->conn, sk); | |
f2fcfcd6 GP |
2330 | break; |
2331 | default: | |
2332 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2333 | break; | |
2334 | } | |
2335 | ||
2336 | done: | |
65c7c491 MH |
2337 | switch (pi->mode) { |
2338 | case L2CAP_MODE_BASIC: | |
2339 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
2340 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
2341 | break; | |
2342 | ||
2343 | case L2CAP_MODE_ERTM: | |
2344 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 2345 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 2346 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
2347 | rfc.retrans_timeout = 0; |
2348 | rfc.monitor_timeout = 0; | |
c74e560c | 2349 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2350 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2351 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 GP |
2352 | |
2353 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2354 | sizeof(rfc), (unsigned long) &rfc); | |
fcc203c3 GP |
2355 | |
2356 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) | |
2357 | break; | |
2358 | ||
2359 | if (pi->fcs == L2CAP_FCS_NONE || | |
2360 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2361 | pi->fcs = L2CAP_FCS_NONE; | |
2362 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2363 | } | |
f2fcfcd6 GP |
2364 | break; |
2365 | ||
2366 | case L2CAP_MODE_STREAMING: | |
2367 | rfc.mode = L2CAP_MODE_STREAMING; | |
2368 | rfc.txwin_size = 0; | |
2369 | rfc.max_transmit = 0; | |
2370 | rfc.retrans_timeout = 0; | |
2371 | rfc.monitor_timeout = 0; | |
c74e560c | 2372 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2373 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2374 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 MH |
2375 | |
2376 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2377 | sizeof(rfc), (unsigned long) &rfc); | |
fcc203c3 GP |
2378 | |
2379 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) | |
2380 | break; | |
2381 | ||
2382 | if (pi->fcs == L2CAP_FCS_NONE || | |
2383 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2384 | pi->fcs = L2CAP_FCS_NONE; | |
2385 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2386 | } | |
65c7c491 MH |
2387 | break; |
2388 | } | |
1da177e4 LT |
2389 | |
2390 | /* FIXME: Need actual value of the flush timeout */ | |
2391 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
2392 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
2393 | ||
aca3192c YH |
2394 | req->dcid = cpu_to_le16(pi->dcid); |
2395 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
2396 | |
2397 | return ptr - data; | |
2398 | } | |
2399 | ||
5dee9e7c | 2400 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
2401 | { |
2402 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
2403 | struct l2cap_conf_rsp *rsp = data; |
2404 | void *ptr = rsp->data; | |
2405 | void *req = pi->conf_req; | |
2406 | int len = pi->conf_len; | |
2407 | int type, hint, olen; | |
2408 | unsigned long val; | |
6464f35f | 2409 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2410 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2411 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2412 | |
5dee9e7c | 2413 | BT_DBG("sk %p", sk); |
820ae1b8 | 2414 | |
5dee9e7c MH |
2415 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2416 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2417 | |
589d2746 | 2418 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2419 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2420 | |
2421 | switch (type) { | |
2422 | case L2CAP_CONF_MTU: | |
861d6882 | 2423 | mtu = val; |
5dee9e7c MH |
2424 | break; |
2425 | ||
2426 | case L2CAP_CONF_FLUSH_TO: | |
2427 | pi->flush_to = val; | |
2428 | break; | |
2429 | ||
2430 | case L2CAP_CONF_QOS: | |
2431 | break; | |
2432 | ||
6464f35f MH |
2433 | case L2CAP_CONF_RFC: |
2434 | if (olen == sizeof(rfc)) | |
2435 | memcpy(&rfc, (void *) val, olen); | |
2436 | break; | |
2437 | ||
fcc203c3 GP |
2438 | case L2CAP_CONF_FCS: |
2439 | if (val == L2CAP_FCS_NONE) | |
2440 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
2441 | ||
2442 | break; | |
2443 | ||
5dee9e7c MH |
2444 | default: |
2445 | if (hint) | |
2446 | break; | |
2447 | ||
2448 | result = L2CAP_CONF_UNKNOWN; | |
2449 | *((u8 *) ptr++) = type; | |
2450 | break; | |
2451 | } | |
2452 | } | |
2453 | ||
f2fcfcd6 GP |
2454 | if (pi->num_conf_rsp || pi->num_conf_req) |
2455 | goto done; | |
2456 | ||
2457 | switch (pi->mode) { | |
2458 | case L2CAP_MODE_STREAMING: | |
2459 | case L2CAP_MODE_ERTM: | |
2460 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; | |
2461 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) | |
2462 | return -ECONNREFUSED; | |
2463 | break; | |
2464 | default: | |
2465 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2466 | break; | |
2467 | } | |
2468 | ||
2469 | done: | |
2470 | if (pi->mode != rfc.mode) { | |
2471 | result = L2CAP_CONF_UNACCEPT; | |
2472 | rfc.mode = pi->mode; | |
2473 | ||
2474 | if (pi->num_conf_rsp == 1) | |
2475 | return -ECONNREFUSED; | |
2476 | ||
2477 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2478 | sizeof(rfc), (unsigned long) &rfc); | |
2479 | } | |
2480 | ||
2481 | ||
5dee9e7c MH |
2482 | if (result == L2CAP_CONF_SUCCESS) { |
2483 | /* Configure output options and let the other side know | |
2484 | * which ones we don't like. */ | |
2485 | ||
f2fcfcd6 GP |
2486 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2487 | result = L2CAP_CONF_UNACCEPT; | |
2488 | else { | |
2489 | pi->omtu = mtu; | |
2490 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
2491 | } | |
2492 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 2493 | |
f2fcfcd6 GP |
2494 | switch (rfc.mode) { |
2495 | case L2CAP_MODE_BASIC: | |
2496 | pi->fcs = L2CAP_FCS_NONE; | |
2497 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
2498 | break; | |
2499 | ||
2500 | case L2CAP_MODE_ERTM: | |
2501 | pi->remote_tx_win = rfc.txwin_size; | |
2502 | pi->remote_max_tx = rfc.max_transmit; | |
1c762159 GP |
2503 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2504 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2505 | ||
2506 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 2507 | |
10467e9e GP |
2508 | rfc.retrans_timeout = |
2509 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2510 | rfc.monitor_timeout = | |
2511 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
2512 | |
2513 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2514 | |
2515 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2516 | sizeof(rfc), (unsigned long) &rfc); | |
2517 | ||
f2fcfcd6 GP |
2518 | break; |
2519 | ||
2520 | case L2CAP_MODE_STREAMING: | |
1c762159 GP |
2521 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2522 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2523 | ||
2524 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2525 | |
2526 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2527 | |
2528 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2529 | sizeof(rfc), (unsigned long) &rfc); | |
2530 | ||
f2fcfcd6 GP |
2531 | break; |
2532 | ||
2533 | default: | |
5dee9e7c | 2534 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2535 | |
6464f35f | 2536 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
2537 | rfc.mode = pi->mode; |
2538 | } | |
6464f35f | 2539 | |
f2fcfcd6 GP |
2540 | if (result == L2CAP_CONF_SUCCESS) |
2541 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
2542 | } | |
5dee9e7c MH |
2543 | rsp->scid = cpu_to_le16(pi->dcid); |
2544 | rsp->result = cpu_to_le16(result); | |
2545 | rsp->flags = cpu_to_le16(0x0000); | |
2546 | ||
2547 | return ptr - data; | |
1da177e4 LT |
2548 | } |
2549 | ||
f2fcfcd6 GP |
2550 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2551 | { | |
2552 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2553 | struct l2cap_conf_req *req = data; | |
2554 | void *ptr = req->data; | |
2555 | int type, olen; | |
2556 | unsigned long val; | |
2557 | struct l2cap_conf_rfc rfc; | |
2558 | ||
2559 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
2560 | ||
2561 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2562 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2563 | ||
2564 | switch (type) { | |
2565 | case L2CAP_CONF_MTU: | |
2566 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2567 | *result = L2CAP_CONF_UNACCEPT; | |
2568 | pi->omtu = L2CAP_DEFAULT_MIN_MTU; | |
2569 | } else | |
2570 | pi->omtu = val; | |
2571 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
2572 | break; | |
2573 | ||
2574 | case L2CAP_CONF_FLUSH_TO: | |
2575 | pi->flush_to = val; | |
2576 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
2577 | 2, pi->flush_to); | |
2578 | break; | |
2579 | ||
2580 | case L2CAP_CONF_RFC: | |
2581 | if (olen == sizeof(rfc)) | |
2582 | memcpy(&rfc, (void *)val, olen); | |
2583 | ||
2584 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
2585 | rfc.mode != pi->mode) | |
2586 | return -ECONNREFUSED; | |
2587 | ||
2588 | pi->mode = rfc.mode; | |
2589 | pi->fcs = 0; | |
2590 | ||
2591 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2592 | sizeof(rfc), (unsigned long) &rfc); | |
2593 | break; | |
2594 | } | |
2595 | } | |
2596 | ||
2597 | if (*result == L2CAP_CONF_SUCCESS) { | |
2598 | switch (rfc.mode) { | |
2599 | case L2CAP_MODE_ERTM: | |
2600 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2601 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2602 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 2603 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2604 | break; |
2605 | case L2CAP_MODE_STREAMING: | |
1c762159 | 2606 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2607 | } |
2608 | } | |
2609 | ||
2610 | req->dcid = cpu_to_le16(pi->dcid); | |
2611 | req->flags = cpu_to_le16(0x0000); | |
2612 | ||
2613 | return ptr - data; | |
2614 | } | |
2615 | ||
5dee9e7c | 2616 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
2617 | { |
2618 | struct l2cap_conf_rsp *rsp = data; | |
2619 | void *ptr = rsp->data; | |
1da177e4 | 2620 | |
5dee9e7c | 2621 | BT_DBG("sk %p", sk); |
1da177e4 | 2622 | |
aca3192c | 2623 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 2624 | rsp->result = cpu_to_le16(result); |
aca3192c | 2625 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2626 | |
2627 | return ptr - data; | |
2628 | } | |
2629 | ||
7b1c0049 GP |
2630 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
2631 | { | |
2632 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2633 | int type, olen; | |
2634 | unsigned long val; | |
2635 | struct l2cap_conf_rfc rfc; | |
2636 | ||
2637 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
2638 | ||
2639 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
2640 | return; | |
2641 | ||
2642 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2643 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2644 | ||
2645 | switch (type) { | |
2646 | case L2CAP_CONF_RFC: | |
2647 | if (olen == sizeof(rfc)) | |
2648 | memcpy(&rfc, (void *)val, olen); | |
2649 | goto done; | |
2650 | } | |
2651 | } | |
2652 | ||
2653 | done: | |
2654 | switch (rfc.mode) { | |
2655 | case L2CAP_MODE_ERTM: | |
2656 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2657 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2658 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2659 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2660 | break; | |
2661 | case L2CAP_MODE_STREAMING: | |
2662 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2663 | } | |
2664 | } | |
2665 | ||
4e8402a3 MH |
2666 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2667 | { | |
2668 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2669 | ||
2670 | if (rej->reason != 0x0000) | |
2671 | return 0; | |
2672 | ||
2673 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2674 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2675 | del_timer(&conn->info_timer); |
984947dc MH |
2676 | |
2677 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2678 | conn->info_ident = 0; |
984947dc | 2679 | |
4e8402a3 MH |
2680 | l2cap_conn_start(conn); |
2681 | } | |
2682 | ||
2683 | return 0; | |
2684 | } | |
2685 | ||
1da177e4 LT |
2686 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2687 | { | |
2688 | struct l2cap_chan_list *list = &conn->chan_list; | |
2689 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
2690 | struct l2cap_conn_rsp rsp; | |
2691 | struct sock *sk, *parent; | |
e7c29cb1 | 2692 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2693 | |
2694 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2695 | __le16 psm = req->psm; |
1da177e4 LT |
2696 | |
2697 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2698 | ||
2699 | /* Check if we have socket listening on psm */ | |
2700 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2701 | if (!parent) { | |
2702 | result = L2CAP_CR_BAD_PSM; | |
2703 | goto sendresp; | |
2704 | } | |
2705 | ||
e7c29cb1 MH |
2706 | /* Check if the ACL is secure enough (if not SDP) */ |
2707 | if (psm != cpu_to_le16(0x0001) && | |
2708 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2709 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2710 | result = L2CAP_CR_SEC_BLOCK; |
2711 | goto response; | |
2712 | } | |
2713 | ||
1da177e4 LT |
2714 | result = L2CAP_CR_NO_MEM; |
2715 | ||
2716 | /* Check for backlog size */ | |
2717 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2718 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2719 | goto response; |
2720 | } | |
2721 | ||
3b1e0a65 | 2722 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2723 | if (!sk) |
2724 | goto response; | |
2725 | ||
fd1278d7 | 2726 | write_lock_bh(&list->lock); |
1da177e4 LT |
2727 | |
2728 | /* Check if we already have channel with that dcid */ | |
2729 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2730 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2731 | sock_set_flag(sk, SOCK_ZAPPED); |
2732 | l2cap_sock_kill(sk); | |
2733 | goto response; | |
2734 | } | |
2735 | ||
2736 | hci_conn_hold(conn->hcon); | |
2737 | ||
2738 | l2cap_sock_init(sk, parent); | |
2739 | bacpy(&bt_sk(sk)->src, conn->src); | |
2740 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2741 | l2cap_pi(sk)->psm = psm; | |
2742 | l2cap_pi(sk)->dcid = scid; | |
2743 | ||
2744 | __l2cap_chan_add(conn, sk, parent); | |
2745 | dcid = l2cap_pi(sk)->scid; | |
2746 | ||
2747 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2748 | ||
1da177e4 LT |
2749 | l2cap_pi(sk)->ident = cmd->ident; |
2750 | ||
984947dc | 2751 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2752 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2753 | if (bt_sk(sk)->defer_setup) { |
2754 | sk->sk_state = BT_CONNECT2; | |
2755 | result = L2CAP_CR_PEND; | |
2756 | status = L2CAP_CS_AUTHOR_PEND; | |
2757 | parent->sk_data_ready(parent, 0); | |
2758 | } else { | |
2759 | sk->sk_state = BT_CONFIG; | |
2760 | result = L2CAP_CR_SUCCESS; | |
2761 | status = L2CAP_CS_NO_INFO; | |
2762 | } | |
79d554a6 MH |
2763 | } else { |
2764 | sk->sk_state = BT_CONNECT2; | |
2765 | result = L2CAP_CR_PEND; | |
2766 | status = L2CAP_CS_AUTHEN_PEND; | |
2767 | } | |
2768 | } else { | |
2769 | sk->sk_state = BT_CONNECT2; | |
2770 | result = L2CAP_CR_PEND; | |
2771 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2772 | } |
2773 | ||
fd1278d7 | 2774 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2775 | |
2776 | response: | |
2777 | bh_unlock_sock(parent); | |
2778 | ||
2779 | sendresp: | |
aca3192c YH |
2780 | rsp.scid = cpu_to_le16(scid); |
2781 | rsp.dcid = cpu_to_le16(dcid); | |
2782 | rsp.result = cpu_to_le16(result); | |
2783 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2784 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2785 | |
2786 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2787 | struct l2cap_info_req info; | |
2788 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2789 | ||
2790 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2791 | conn->info_ident = l2cap_get_ident(conn); | |
2792 | ||
2793 | mod_timer(&conn->info_timer, jiffies + | |
2794 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2795 | ||
2796 | l2cap_send_cmd(conn, conn->info_ident, | |
2797 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2798 | } | |
2799 | ||
1da177e4 LT |
2800 | return 0; |
2801 | } | |
2802 | ||
2803 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2804 | { | |
2805 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2806 | u16 scid, dcid, result, status; | |
2807 | struct sock *sk; | |
2808 | u8 req[128]; | |
2809 | ||
2810 | scid = __le16_to_cpu(rsp->scid); | |
2811 | dcid = __le16_to_cpu(rsp->dcid); | |
2812 | result = __le16_to_cpu(rsp->result); | |
2813 | status = __le16_to_cpu(rsp->status); | |
2814 | ||
2815 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2816 | ||
2817 | if (scid) { | |
af05b30b GP |
2818 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2819 | if (!sk) | |
1da177e4 LT |
2820 | return 0; |
2821 | } else { | |
af05b30b GP |
2822 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2823 | if (!sk) | |
1da177e4 LT |
2824 | return 0; |
2825 | } | |
2826 | ||
2827 | switch (result) { | |
2828 | case L2CAP_CR_SUCCESS: | |
2829 | sk->sk_state = BT_CONFIG; | |
2830 | l2cap_pi(sk)->ident = 0; | |
2831 | l2cap_pi(sk)->dcid = dcid; | |
2832 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2833 | ||
6a8d3010 MH |
2834 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2835 | ||
1da177e4 LT |
2836 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2837 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 2838 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2839 | break; |
2840 | ||
2841 | case L2CAP_CR_PEND: | |
6a8d3010 | 2842 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2843 | break; |
2844 | ||
2845 | default: | |
2846 | l2cap_chan_del(sk, ECONNREFUSED); | |
2847 | break; | |
2848 | } | |
2849 | ||
2850 | bh_unlock_sock(sk); | |
2851 | return 0; | |
2852 | } | |
2853 | ||
88219a0f | 2854 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2855 | { |
2856 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2857 | u16 dcid, flags; | |
2858 | u8 rsp[64]; | |
2859 | struct sock *sk; | |
5dee9e7c | 2860 | int len; |
1da177e4 LT |
2861 | |
2862 | dcid = __le16_to_cpu(req->dcid); | |
2863 | flags = __le16_to_cpu(req->flags); | |
2864 | ||
2865 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2866 | ||
af05b30b GP |
2867 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2868 | if (!sk) | |
1da177e4 LT |
2869 | return -ENOENT; |
2870 | ||
354f60a9 MH |
2871 | if (sk->sk_state == BT_DISCONN) |
2872 | goto unlock; | |
2873 | ||
5dee9e7c | 2874 | /* Reject if config buffer is too small. */ |
88219a0f | 2875 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2876 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2877 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2878 | l2cap_build_conf_rsp(sk, rsp, | |
2879 | L2CAP_CONF_REJECT, flags), rsp); | |
2880 | goto unlock; | |
2881 | } | |
2882 | ||
2883 | /* Store config. */ | |
2884 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2885 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2886 | |
2887 | if (flags & 0x0001) { | |
2888 | /* Incomplete config. Send empty response. */ | |
2889 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2890 | l2cap_build_conf_rsp(sk, rsp, |
2891 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2892 | goto unlock; |
2893 | } | |
2894 | ||
2895 | /* Complete config. */ | |
5dee9e7c | 2896 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 2897 | if (len < 0) { |
22121fc9 | 2898 | l2cap_send_disconn_req(conn, sk); |
1da177e4 | 2899 | goto unlock; |
f2fcfcd6 | 2900 | } |
1da177e4 | 2901 | |
5dee9e7c | 2902 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 2903 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 2904 | |
5dee9e7c MH |
2905 | /* Reset config buffer. */ |
2906 | l2cap_pi(sk)->conf_len = 0; | |
2907 | ||
876d9484 MH |
2908 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2909 | goto unlock; | |
2910 | ||
1da177e4 | 2911 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
f64f9e71 JP |
2912 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
2913 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
2914 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
2915 | ||
1da177e4 | 2916 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2917 | |
0565c1c2 GP |
2918 | l2cap_pi(sk)->next_tx_seq = 0; |
2919 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 2920 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2921 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2922 | l2cap_ertm_init(sk); | |
2923 | ||
1da177e4 | 2924 | l2cap_chan_ready(sk); |
876d9484 MH |
2925 | goto unlock; |
2926 | } | |
2927 | ||
2928 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2929 | u8 buf[64]; |
1da177e4 | 2930 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 2931 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 2932 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2933 | } |
2934 | ||
2935 | unlock: | |
2936 | bh_unlock_sock(sk); | |
2937 | return 0; | |
2938 | } | |
2939 | ||
2940 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2941 | { | |
2942 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2943 | u16 scid, flags, result; | |
2944 | struct sock *sk; | |
7b1c0049 | 2945 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2946 | |
2947 | scid = __le16_to_cpu(rsp->scid); | |
2948 | flags = __le16_to_cpu(rsp->flags); | |
2949 | result = __le16_to_cpu(rsp->result); | |
2950 | ||
af05b30b GP |
2951 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2952 | scid, flags, result); | |
1da177e4 | 2953 | |
af05b30b GP |
2954 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2955 | if (!sk) | |
1da177e4 LT |
2956 | return 0; |
2957 | ||
2958 | switch (result) { | |
2959 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2960 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2961 | break; |
2962 | ||
2963 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 2964 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2965 | char req[64]; |
2966 | ||
c2c77ec8 AE |
2967 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
2968 | l2cap_send_disconn_req(conn, sk); | |
2969 | goto done; | |
2970 | } | |
2971 | ||
f2fcfcd6 GP |
2972 | /* throw out any old stored conf requests */ |
2973 | result = L2CAP_CONF_SUCCESS; | |
2974 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
2975 | len, req, &result); | |
2976 | if (len < 0) { | |
22121fc9 | 2977 | l2cap_send_disconn_req(conn, sk); |
f2fcfcd6 GP |
2978 | goto done; |
2979 | } | |
2980 | ||
2981 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2982 | L2CAP_CONF_REQ, len, req); | |
2983 | l2cap_pi(sk)->num_conf_req++; | |
2984 | if (result != L2CAP_CONF_SUCCESS) | |
2985 | goto done; | |
2986 | break; | |
1da177e4 LT |
2987 | } |
2988 | ||
8e87d142 | 2989 | default: |
1da177e4 | 2990 | sk->sk_state = BT_DISCONN; |
b1235d79 | 2991 | sk->sk_err = ECONNRESET; |
1da177e4 | 2992 | l2cap_sock_set_timer(sk, HZ * 5); |
22121fc9 | 2993 | l2cap_send_disconn_req(conn, sk); |
1da177e4 LT |
2994 | goto done; |
2995 | } | |
2996 | ||
2997 | if (flags & 0x01) | |
2998 | goto done; | |
2999 | ||
1da177e4 LT |
3000 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
3001 | ||
3002 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
f64f9e71 JP |
3003 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
3004 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
3005 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
3006 | ||
1da177e4 | 3007 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 3008 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 3009 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 3010 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3011 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3012 | l2cap_ertm_init(sk); | |
3013 | ||
1da177e4 LT |
3014 | l2cap_chan_ready(sk); |
3015 | } | |
3016 | ||
3017 | done: | |
3018 | bh_unlock_sock(sk); | |
3019 | return 0; | |
3020 | } | |
3021 | ||
3022 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3023 | { | |
3024 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3025 | struct l2cap_disconn_rsp rsp; | |
3026 | u16 dcid, scid; | |
3027 | struct sock *sk; | |
3028 | ||
3029 | scid = __le16_to_cpu(req->scid); | |
3030 | dcid = __le16_to_cpu(req->dcid); | |
3031 | ||
3032 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3033 | ||
af05b30b GP |
3034 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3035 | if (!sk) | |
1da177e4 LT |
3036 | return 0; |
3037 | ||
aca3192c YH |
3038 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3039 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
3040 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3041 | ||
3042 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3043 | ||
1c2acffb | 3044 | skb_queue_purge(TX_QUEUE(sk)); |
0565c1c2 GP |
3045 | |
3046 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
3047 | skb_queue_purge(SREJ_QUEUE(sk)); | |
3048 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
3049 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
c1b4f43b | 3050 | del_timer(&l2cap_pi(sk)->ack_timer); |
0565c1c2 | 3051 | } |
1c2acffb | 3052 | |
1da177e4 LT |
3053 | l2cap_chan_del(sk, ECONNRESET); |
3054 | bh_unlock_sock(sk); | |
3055 | ||
3056 | l2cap_sock_kill(sk); | |
3057 | return 0; | |
3058 | } | |
3059 | ||
3060 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3061 | { | |
3062 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3063 | u16 dcid, scid; | |
3064 | struct sock *sk; | |
3065 | ||
3066 | scid = __le16_to_cpu(rsp->scid); | |
3067 | dcid = __le16_to_cpu(rsp->dcid); | |
3068 | ||
3069 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3070 | ||
af05b30b GP |
3071 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3072 | if (!sk) | |
1da177e4 LT |
3073 | return 0; |
3074 | ||
1c2acffb | 3075 | skb_queue_purge(TX_QUEUE(sk)); |
0565c1c2 GP |
3076 | |
3077 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
3078 | skb_queue_purge(SREJ_QUEUE(sk)); | |
3079 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
3080 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
c1b4f43b | 3081 | del_timer(&l2cap_pi(sk)->ack_timer); |
0565c1c2 | 3082 | } |
1c2acffb | 3083 | |
1da177e4 LT |
3084 | l2cap_chan_del(sk, 0); |
3085 | bh_unlock_sock(sk); | |
3086 | ||
3087 | l2cap_sock_kill(sk); | |
3088 | return 0; | |
3089 | } | |
3090 | ||
3091 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3092 | { | |
3093 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3094 | u16 type; |
3095 | ||
3096 | type = __le16_to_cpu(req->type); | |
3097 | ||
3098 | BT_DBG("type 0x%4.4x", type); | |
3099 | ||
f0709e03 MH |
3100 | if (type == L2CAP_IT_FEAT_MASK) { |
3101 | u8 buf[8]; | |
44dd46de | 3102 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3103 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3104 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3105 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
44dd46de | 3106 | if (enable_ertm) |
fcc203c3 GP |
3107 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3108 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 3109 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3110 | l2cap_send_cmd(conn, cmd->ident, |
3111 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3112 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3113 | u8 buf[12]; | |
3114 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
3115 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3116 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
3117 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
3118 | l2cap_send_cmd(conn, cmd->ident, | |
3119 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3120 | } else { |
3121 | struct l2cap_info_rsp rsp; | |
3122 | rsp.type = cpu_to_le16(type); | |
3123 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3124 | l2cap_send_cmd(conn, cmd->ident, | |
3125 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3126 | } | |
1da177e4 LT |
3127 | |
3128 | return 0; | |
3129 | } | |
3130 | ||
3131 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3132 | { | |
3133 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3134 | u16 type, result; | |
3135 | ||
3136 | type = __le16_to_cpu(rsp->type); | |
3137 | result = __le16_to_cpu(rsp->result); | |
3138 | ||
3139 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3140 | ||
4e8402a3 MH |
3141 | del_timer(&conn->info_timer); |
3142 | ||
984947dc | 3143 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3144 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3145 | |
47ec1dcd | 3146 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3147 | struct l2cap_info_req req; |
3148 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3149 | ||
3150 | conn->info_ident = l2cap_get_ident(conn); | |
3151 | ||
3152 | l2cap_send_cmd(conn, conn->info_ident, | |
3153 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3154 | } else { | |
3155 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3156 | conn->info_ident = 0; | |
3157 | ||
3158 | l2cap_conn_start(conn); | |
3159 | } | |
3160 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3161 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3162 | conn->info_ident = 0; |
984947dc MH |
3163 | |
3164 | l2cap_conn_start(conn); | |
3165 | } | |
4e8402a3 | 3166 | |
1da177e4 LT |
3167 | return 0; |
3168 | } | |
3169 | ||
3170 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
3171 | { | |
3172 | u8 *data = skb->data; | |
3173 | int len = skb->len; | |
3174 | struct l2cap_cmd_hdr cmd; | |
3175 | int err = 0; | |
3176 | ||
3177 | l2cap_raw_recv(conn, skb); | |
3178 | ||
3179 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3180 | u16 cmd_len; |
1da177e4 LT |
3181 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3182 | data += L2CAP_CMD_HDR_SIZE; | |
3183 | len -= L2CAP_CMD_HDR_SIZE; | |
3184 | ||
88219a0f | 3185 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3186 | |
88219a0f | 3187 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3188 | |
88219a0f | 3189 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3190 | BT_DBG("corrupted command"); |
3191 | break; | |
3192 | } | |
3193 | ||
3194 | switch (cmd.code) { | |
3195 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 3196 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
3197 | break; |
3198 | ||
3199 | case L2CAP_CONN_REQ: | |
3200 | err = l2cap_connect_req(conn, &cmd, data); | |
3201 | break; | |
3202 | ||
3203 | case L2CAP_CONN_RSP: | |
3204 | err = l2cap_connect_rsp(conn, &cmd, data); | |
3205 | break; | |
3206 | ||
3207 | case L2CAP_CONF_REQ: | |
88219a0f | 3208 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
3209 | break; |
3210 | ||
3211 | case L2CAP_CONF_RSP: | |
3212 | err = l2cap_config_rsp(conn, &cmd, data); | |
3213 | break; | |
3214 | ||
3215 | case L2CAP_DISCONN_REQ: | |
3216 | err = l2cap_disconnect_req(conn, &cmd, data); | |
3217 | break; | |
3218 | ||
3219 | case L2CAP_DISCONN_RSP: | |
3220 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
3221 | break; | |
3222 | ||
3223 | case L2CAP_ECHO_REQ: | |
88219a0f | 3224 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
3225 | break; |
3226 | ||
3227 | case L2CAP_ECHO_RSP: | |
3228 | break; | |
3229 | ||
3230 | case L2CAP_INFO_REQ: | |
3231 | err = l2cap_information_req(conn, &cmd, data); | |
3232 | break; | |
3233 | ||
3234 | case L2CAP_INFO_RSP: | |
3235 | err = l2cap_information_rsp(conn, &cmd, data); | |
3236 | break; | |
3237 | ||
3238 | default: | |
3239 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
3240 | err = -EINVAL; | |
3241 | break; | |
3242 | } | |
3243 | ||
3244 | if (err) { | |
3245 | struct l2cap_cmd_rej rej; | |
3246 | BT_DBG("error %d", err); | |
3247 | ||
3248 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3249 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3250 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3251 | } | |
3252 | ||
88219a0f AV |
3253 | data += cmd_len; |
3254 | len -= cmd_len; | |
1da177e4 LT |
3255 | } |
3256 | ||
3257 | kfree_skb(skb); | |
3258 | } | |
3259 | ||
fcc203c3 GP |
3260 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3261 | { | |
3262 | u16 our_fcs, rcv_fcs; | |
3263 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3264 | ||
3265 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
3266 | skb_trim(skb, skb->len - 2); | |
3267 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3268 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3269 | ||
3270 | if (our_fcs != rcv_fcs) | |
3271 | return -EINVAL; | |
3272 | } | |
3273 | return 0; | |
3274 | } | |
3275 | ||
d5392c8f GP |
3276 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
3277 | { | |
3278 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3279 | u16 control = 0; | |
3280 | ||
3281 | pi->frames_sent = 0; | |
3282 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
3283 | ||
3284 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3285 | ||
3286 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3287 | control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL; | |
3288 | l2cap_send_sframe(pi, control); | |
3289 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
3290 | } | |
3291 | ||
3292 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0) | |
3293 | __mod_retrans_timer(); | |
3294 | ||
3295 | l2cap_ertm_send(sk); | |
3296 | ||
3297 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
3298 | pi->frames_sent == 0) { | |
3299 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
3300 | l2cap_send_sframe(pi, control); |
3301 | } | |
3302 | } | |
3303 | ||
8f17154f GP |
3304 | static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
3305 | { | |
3306 | struct sk_buff *next_skb; | |
3307 | ||
3308 | bt_cb(skb)->tx_seq = tx_seq; | |
3309 | bt_cb(skb)->sar = sar; | |
3310 | ||
3311 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
3312 | if (!next_skb) { | |
3313 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
3314 | return; | |
3315 | } | |
3316 | ||
3317 | do { | |
3318 | if (bt_cb(next_skb)->tx_seq > tx_seq) { | |
3319 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); | |
3320 | return; | |
3321 | } | |
3322 | ||
3323 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
3324 | break; | |
3325 | ||
59203a21 | 3326 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
3327 | |
3328 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
3329 | } | |
3330 | ||
c74e560c GP |
3331 | static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3332 | { | |
3333 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3334 | struct sk_buff *_skb; | |
3335 | int err = -EINVAL; | |
3336 | ||
3337 | switch (control & L2CAP_CTRL_SAR) { | |
3338 | case L2CAP_SDU_UNSEGMENTED: | |
3339 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3340 | kfree_skb(pi->sdu); | |
3341 | break; | |
3342 | } | |
3343 | ||
3344 | err = sock_queue_rcv_skb(sk, skb); | |
3345 | if (!err) | |
3346 | return 0; | |
3347 | ||
3348 | break; | |
3349 | ||
3350 | case L2CAP_SDU_START: | |
3351 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3352 | kfree_skb(pi->sdu); | |
3353 | break; | |
3354 | } | |
3355 | ||
3356 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3357 | skb_pull(skb, 2); | |
3358 | ||
052897ca GP |
3359 | if (pi->sdu_len > pi->imtu) { |
3360 | err = -EMSGSIZE; | |
3361 | break; | |
3362 | } | |
3363 | ||
c74e560c GP |
3364 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3365 | if (!pi->sdu) { | |
3366 | err = -ENOMEM; | |
3367 | break; | |
3368 | } | |
3369 | ||
3370 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3371 | ||
3372 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3373 | pi->partial_sdu_len = skb->len; | |
3374 | err = 0; | |
3375 | break; | |
3376 | ||
3377 | case L2CAP_SDU_CONTINUE: | |
3378 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3379 | break; | |
3380 | ||
3381 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3382 | ||
3383 | pi->partial_sdu_len += skb->len; | |
3384 | if (pi->partial_sdu_len > pi->sdu_len) | |
3385 | kfree_skb(pi->sdu); | |
3386 | else | |
3387 | err = 0; | |
3388 | ||
3389 | break; | |
3390 | ||
3391 | case L2CAP_SDU_END: | |
3392 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3393 | break; | |
3394 | ||
3395 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3396 | ||
3397 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3398 | pi->partial_sdu_len += skb->len; | |
3399 | ||
36f2fd58 GP |
3400 | if (pi->partial_sdu_len > pi->imtu) |
3401 | goto drop; | |
3402 | ||
c74e560c GP |
3403 | if (pi->partial_sdu_len == pi->sdu_len) { |
3404 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3405 | err = sock_queue_rcv_skb(sk, _skb); | |
3406 | if (err < 0) | |
3407 | kfree_skb(_skb); | |
3408 | } | |
c74e560c GP |
3409 | err = 0; |
3410 | ||
36f2fd58 GP |
3411 | drop: |
3412 | kfree_skb(pi->sdu); | |
c74e560c GP |
3413 | break; |
3414 | } | |
3415 | ||
3416 | kfree_skb(skb); | |
3417 | return err; | |
3418 | } | |
3419 | ||
8f17154f GP |
3420 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3421 | { | |
3422 | struct sk_buff *skb; | |
afefdbc4 | 3423 | u16 control; |
8f17154f | 3424 | |
59203a21 | 3425 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3426 | if (bt_cb(skb)->tx_seq != tx_seq) |
3427 | break; | |
3428 | ||
3429 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3430 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
8f17154f GP |
3431 | l2cap_sar_reassembly_sdu(sk, skb, control); |
3432 | l2cap_pi(sk)->buffer_seq_srej = | |
3433 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
3434 | tx_seq++; | |
3435 | } | |
3436 | } | |
3437 | ||
3438 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3439 | { | |
3440 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3441 | struct srej_list *l, *tmp; | |
3442 | u16 control; | |
3443 | ||
59203a21 | 3444 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3445 | if (l->tx_seq == tx_seq) { |
3446 | list_del(&l->list); | |
3447 | kfree(l); | |
3448 | return; | |
3449 | } | |
3450 | control = L2CAP_SUPER_SELECT_REJECT; | |
3451 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3452 | l2cap_send_sframe(pi, control); | |
3453 | list_del(&l->list); | |
3454 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3455 | } | |
3456 | } | |
3457 | ||
3458 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3459 | { | |
3460 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3461 | struct srej_list *new; | |
3462 | u16 control; | |
3463 | ||
3464 | while (tx_seq != pi->expected_tx_seq) { | |
3465 | control = L2CAP_SUPER_SELECT_REJECT; | |
3466 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3467 | l2cap_send_sframe(pi, control); | |
3468 | ||
3469 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
3470 | new->tx_seq = pi->expected_tx_seq++; | |
3471 | list_add_tail(&new->list, SREJ_LIST(sk)); | |
3472 | } | |
3473 | pi->expected_tx_seq++; | |
3474 | } | |
3475 | ||
1c2acffb GP |
3476 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3477 | { | |
3478 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3479 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3480 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3481 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
803020c6 | 3482 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3483 | int err = 0; |
3484 | ||
3485 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3486 | ||
9b16dc65 GP |
3487 | if (L2CAP_CTRL_FINAL & rx_control && |
3488 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3489 | del_timer(&pi->monitor_timer); |
3490 | if (pi->unacked_frames > 0) | |
3491 | __mod_retrans_timer(); | |
3492 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3493 | } | |
3494 | ||
9f121a5a GP |
3495 | pi->expected_ack_seq = req_seq; |
3496 | l2cap_drop_acked_frames(sk); | |
3497 | ||
8f17154f GP |
3498 | if (tx_seq == pi->expected_tx_seq) |
3499 | goto expected; | |
1c2acffb | 3500 | |
8f17154f GP |
3501 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3502 | struct srej_list *first; | |
30afb5b2 | 3503 | |
8f17154f GP |
3504 | first = list_first_entry(SREJ_LIST(sk), |
3505 | struct srej_list, list); | |
3506 | if (tx_seq == first->tx_seq) { | |
3507 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3508 | l2cap_check_srej_gap(sk, tx_seq); | |
3509 | ||
3510 | list_del(&first->list); | |
3511 | kfree(first); | |
3512 | ||
3513 | if (list_empty(SREJ_LIST(sk))) { | |
3514 | pi->buffer_seq = pi->buffer_seq_srej; | |
3515 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3516 | l2cap_send_ack(pi); |
8f17154f GP |
3517 | } |
3518 | } else { | |
3519 | struct srej_list *l; | |
3520 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3521 | ||
3522 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3523 | if (l->tx_seq == tx_seq) { | |
3524 | l2cap_resend_srejframe(sk, tx_seq); | |
3525 | return 0; | |
3526 | } | |
3527 | } | |
3528 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3529 | } |
3530 | } else { | |
8f17154f | 3531 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3532 | |
8f17154f GP |
3533 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3534 | pi->buffer_seq_srej = pi->buffer_seq; | |
3535 | ||
3536 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
3537 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3538 | ||
ef54fd93 GP |
3539 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3540 | ||
8f17154f | 3541 | l2cap_send_srejframe(sk, tx_seq); |
1c2acffb | 3542 | } |
30afb5b2 GP |
3543 | return 0; |
3544 | ||
8f17154f GP |
3545 | expected: |
3546 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3547 | ||
3548 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3549 | bt_cb(skb)->tx_seq = tx_seq; |
3550 | bt_cb(skb)->sar = sar; | |
3551 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3552 | return 0; |
3553 | } | |
3554 | ||
4ec10d97 GP |
3555 | if (rx_control & L2CAP_CTRL_FINAL) { |
3556 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3557 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
3558 | else { | |
f6e6b168 GP |
3559 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3560 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
4ec10d97 GP |
3561 | pi->next_tx_seq = pi->expected_ack_seq; |
3562 | l2cap_ertm_send(sk); | |
3563 | } | |
3564 | } | |
3565 | ||
8f17154f GP |
3566 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; |
3567 | ||
3568 | err = l2cap_sar_reassembly_sdu(sk, skb, rx_control); | |
3569 | if (err < 0) | |
3570 | return err; | |
3571 | ||
c1b4f43b GP |
3572 | __mod_ack_timer(); |
3573 | ||
803020c6 GP |
3574 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3575 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3576 | l2cap_send_ack(pi); |
3577 | ||
8f17154f | 3578 | return 0; |
1c2acffb GP |
3579 | } |
3580 | ||
e072745f | 3581 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
3582 | { |
3583 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 GP |
3584 | |
3585 | pi->expected_ack_seq = __get_reqseq(rx_control); | |
3586 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 3587 | |
e072745f | 3588 | if (rx_control & L2CAP_CTRL_POLL) { |
05fbd89d GP |
3589 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3590 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
3591 | (pi->unacked_frames > 0)) | |
3592 | __mod_retrans_timer(); | |
3593 | ||
3594 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3595 | l2cap_send_srejtail(sk); | |
3596 | } else { | |
3597 | l2cap_send_i_or_rr_or_rnr(sk); | |
3598 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3599 | } | |
1d8f5d16 | 3600 | |
e072745f GP |
3601 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3602 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 3603 | |
e072745f GP |
3604 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3605 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
3606 | else { | |
f6e6b168 GP |
3607 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3608 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
e072745f GP |
3609 | pi->next_tx_seq = pi->expected_ack_seq; |
3610 | l2cap_ertm_send(sk); | |
3611 | } | |
2246b2f1 | 3612 | |
e072745f | 3613 | } else { |
e072745f GP |
3614 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3615 | (pi->unacked_frames > 0)) | |
3616 | __mod_retrans_timer(); | |
1c2acffb | 3617 | |
2246b2f1 | 3618 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
e072745f GP |
3619 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) |
3620 | l2cap_send_ack(pi); | |
3621 | else | |
3622 | l2cap_ertm_send(sk); | |
3623 | } | |
3624 | } | |
2246b2f1 | 3625 | |
e072745f GP |
3626 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
3627 | { | |
3628 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3629 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3630 | |
e072745f GP |
3631 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3632 | ||
8abb52ee | 3633 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
3634 | l2cap_drop_acked_frames(sk); |
3635 | ||
3636 | if (rx_control & L2CAP_CTRL_FINAL) { | |
3637 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3638 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
3639 | else { | |
f6e6b168 GP |
3640 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3641 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
4ec10d97 GP |
3642 | pi->next_tx_seq = pi->expected_ack_seq; |
3643 | l2cap_ertm_send(sk); | |
4ec10d97 | 3644 | } |
e072745f | 3645 | } else { |
f6e6b168 GP |
3646 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3647 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
e072745f GP |
3648 | pi->next_tx_seq = pi->expected_ack_seq; |
3649 | l2cap_ertm_send(sk); | |
30afb5b2 | 3650 | |
0301ef04 | 3651 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 3652 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
3653 | } |
3654 | } | |
3655 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
3656 | { | |
3657 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3658 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3659 | |
e072745f | 3660 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3661 | |
e072745f GP |
3662 | if (rx_control & L2CAP_CTRL_POLL) { |
3663 | pi->expected_ack_seq = tx_seq; | |
3664 | l2cap_drop_acked_frames(sk); | |
3665 | l2cap_retransmit_frame(sk, tx_seq); | |
3666 | l2cap_ertm_send(sk); | |
3667 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { | |
3668 | pi->srej_save_reqseq = tx_seq; | |
3669 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3670 | } |
e072745f GP |
3671 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3672 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
3673 | pi->srej_save_reqseq == tx_seq) | |
3674 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
3675 | else | |
ef54fd93 | 3676 | l2cap_retransmit_frame(sk, tx_seq); |
e072745f GP |
3677 | } else { |
3678 | l2cap_retransmit_frame(sk, tx_seq); | |
3679 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { | |
3680 | pi->srej_save_reqseq = tx_seq; | |
3681 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3682 | } |
e072745f GP |
3683 | } |
3684 | } | |
3685 | ||
3686 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
3687 | { | |
3688 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3689 | u8 tx_seq = __get_reqseq(rx_control); | |
3690 | ||
3691 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; | |
3692 | pi->expected_ack_seq = tx_seq; | |
3693 | l2cap_drop_acked_frames(sk); | |
3694 | ||
99b0d4b7 GP |
3695 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
3696 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
3697 | if (rx_control & L2CAP_CTRL_POLL) |
3698 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 3699 | return; |
e072745f | 3700 | } |
99b0d4b7 GP |
3701 | |
3702 | if (rx_control & L2CAP_CTRL_POLL) | |
3703 | l2cap_send_srejtail(sk); | |
3704 | else | |
3705 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
3706 | } |
3707 | ||
3708 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
3709 | { | |
3710 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3711 | ||
9b16dc65 GP |
3712 | if (L2CAP_CTRL_FINAL & rx_control && |
3713 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
3714 | del_timer(&l2cap_pi(sk)->monitor_timer); |
3715 | if (l2cap_pi(sk)->unacked_frames > 0) | |
3716 | __mod_retrans_timer(); | |
3717 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3718 | } | |
3719 | ||
3720 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3721 | case L2CAP_SUPER_RCV_READY: | |
3722 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
3723 | break; |
3724 | ||
e072745f GP |
3725 | case L2CAP_SUPER_REJECT: |
3726 | l2cap_data_channel_rejframe(sk, rx_control); | |
3727 | break; | |
2246b2f1 | 3728 | |
e072745f GP |
3729 | case L2CAP_SUPER_SELECT_REJECT: |
3730 | l2cap_data_channel_srejframe(sk, rx_control); | |
3731 | break; | |
3732 | ||
3733 | case L2CAP_SUPER_RCV_NOT_READY: | |
3734 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
3735 | break; |
3736 | } | |
3737 | ||
faaebd19 | 3738 | kfree_skb(skb); |
1c2acffb GP |
3739 | return 0; |
3740 | } | |
3741 | ||
1da177e4 LT |
3742 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3743 | { | |
3744 | struct sock *sk; | |
6840ed07 | 3745 | struct l2cap_pinfo *pi; |
c74e560c | 3746 | u16 control, len; |
01760bdd | 3747 | u8 tx_seq, req_seq, next_tx_seq_offset, req_seq_offset; |
1da177e4 LT |
3748 | |
3749 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
3750 | if (!sk) { | |
3751 | BT_DBG("unknown cid 0x%4.4x", cid); | |
3752 | goto drop; | |
3753 | } | |
3754 | ||
6840ed07 GP |
3755 | pi = l2cap_pi(sk); |
3756 | ||
1da177e4 LT |
3757 | BT_DBG("sk %p, len %d", sk, skb->len); |
3758 | ||
3759 | if (sk->sk_state != BT_CONNECTED) | |
3760 | goto drop; | |
3761 | ||
6840ed07 | 3762 | switch (pi->mode) { |
1c2acffb GP |
3763 | case L2CAP_MODE_BASIC: |
3764 | /* If socket recv buffers overflows we drop data here | |
3765 | * which is *bad* because L2CAP has to be reliable. | |
3766 | * But we don't have any other choice. L2CAP doesn't | |
3767 | * provide flow control mechanism. */ | |
1da177e4 | 3768 | |
6840ed07 | 3769 | if (pi->imtu < skb->len) |
1c2acffb | 3770 | goto drop; |
1da177e4 | 3771 | |
1c2acffb GP |
3772 | if (!sock_queue_rcv_skb(sk, skb)) |
3773 | goto done; | |
3774 | break; | |
3775 | ||
3776 | case L2CAP_MODE_ERTM: | |
3777 | control = get_unaligned_le16(skb->data); | |
3778 | skb_pull(skb, 2); | |
c74e560c | 3779 | len = skb->len; |
1c2acffb | 3780 | |
c74e560c GP |
3781 | if (__is_sar_start(control)) |
3782 | len -= 2; | |
3783 | ||
fcc203c3 GP |
3784 | if (pi->fcs == L2CAP_FCS_CRC16) |
3785 | len -= 2; | |
3786 | ||
30afb5b2 GP |
3787 | /* |
3788 | * We can just drop the corrupted I-frame here. | |
3789 | * Receiver will miss it and start proper recovery | |
3790 | * procedures and ask retransmission. | |
3791 | */ | |
1c762159 | 3792 | if (len > pi->mps) |
1c2acffb GP |
3793 | goto drop; |
3794 | ||
fcc203c3 GP |
3795 | if (l2cap_check_fcs(pi, skb)) |
3796 | goto drop; | |
3797 | ||
01760bdd JPRV |
3798 | req_seq = __get_reqseq(control); |
3799 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
3800 | if (req_seq_offset < 0) | |
3801 | req_seq_offset += 64; | |
3802 | ||
3803 | next_tx_seq_offset = | |
3804 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
3805 | if (next_tx_seq_offset < 0) | |
3806 | next_tx_seq_offset += 64; | |
3807 | ||
3808 | /* check for invalid req-seq */ | |
3809 | if (req_seq_offset > next_tx_seq_offset) { | |
3810 | l2cap_send_disconn_req(pi->conn, sk); | |
3811 | goto drop; | |
3812 | } | |
3813 | ||
277ffbe3 GP |
3814 | if (__is_iframe(control)) { |
3815 | if (len < 4) | |
3816 | goto drop; | |
3817 | ||
fcafde2e | 3818 | l2cap_data_channel_iframe(sk, control, skb); |
277ffbe3 GP |
3819 | } else { |
3820 | if (len != 0) | |
3821 | goto drop; | |
3822 | ||
fcafde2e | 3823 | l2cap_data_channel_sframe(sk, control, skb); |
277ffbe3 | 3824 | } |
1c2acffb | 3825 | |
fcafde2e | 3826 | goto done; |
1c2acffb | 3827 | |
6840ed07 GP |
3828 | case L2CAP_MODE_STREAMING: |
3829 | control = get_unaligned_le16(skb->data); | |
3830 | skb_pull(skb, 2); | |
3831 | len = skb->len; | |
3832 | ||
3833 | if (__is_sar_start(control)) | |
3834 | len -= 2; | |
3835 | ||
fcc203c3 GP |
3836 | if (pi->fcs == L2CAP_FCS_CRC16) |
3837 | len -= 2; | |
3838 | ||
1c762159 | 3839 | if (len > pi->mps || len < 4 || __is_sframe(control)) |
6840ed07 GP |
3840 | goto drop; |
3841 | ||
fcc203c3 GP |
3842 | if (l2cap_check_fcs(pi, skb)) |
3843 | goto drop; | |
3844 | ||
6840ed07 GP |
3845 | tx_seq = __get_txseq(control); |
3846 | ||
3847 | if (pi->expected_tx_seq == tx_seq) | |
3848 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3849 | else | |
7dffe421 | 3850 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3851 | |
fcafde2e | 3852 | l2cap_sar_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
3853 | |
3854 | goto done; | |
3855 | ||
1c2acffb | 3856 | default: |
e8235c6b | 3857 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
3858 | break; |
3859 | } | |
1da177e4 LT |
3860 | |
3861 | drop: | |
3862 | kfree_skb(skb); | |
3863 | ||
3864 | done: | |
0139418c MH |
3865 | if (sk) |
3866 | bh_unlock_sock(sk); | |
3867 | ||
1da177e4 LT |
3868 | return 0; |
3869 | } | |
3870 | ||
8e036fc3 | 3871 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3872 | { |
3873 | struct sock *sk; | |
3874 | ||
3875 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3876 | if (!sk) | |
3877 | goto drop; | |
3878 | ||
3879 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3880 | ||
3881 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3882 | goto drop; | |
3883 | ||
3884 | if (l2cap_pi(sk)->imtu < skb->len) | |
3885 | goto drop; | |
3886 | ||
3887 | if (!sock_queue_rcv_skb(sk, skb)) | |
3888 | goto done; | |
3889 | ||
3890 | drop: | |
3891 | kfree_skb(skb); | |
3892 | ||
3893 | done: | |
af05b30b GP |
3894 | if (sk) |
3895 | bh_unlock_sock(sk); | |
1da177e4 LT |
3896 | return 0; |
3897 | } | |
3898 | ||
3899 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
3900 | { | |
3901 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3902 | u16 cid, len; |
3903 | __le16 psm; | |
1da177e4 LT |
3904 | |
3905 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3906 | cid = __le16_to_cpu(lh->cid); | |
3907 | len = __le16_to_cpu(lh->len); | |
3908 | ||
1c2acffb GP |
3909 | if (len != skb->len) { |
3910 | kfree_skb(skb); | |
3911 | return; | |
3912 | } | |
3913 | ||
1da177e4 LT |
3914 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3915 | ||
3916 | switch (cid) { | |
8db4dc46 | 3917 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3918 | l2cap_sig_channel(conn, skb); |
3919 | break; | |
3920 | ||
8db4dc46 | 3921 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3922 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3923 | skb_pull(skb, 2); |
3924 | l2cap_conless_channel(conn, psm, skb); | |
3925 | break; | |
3926 | ||
3927 | default: | |
3928 | l2cap_data_channel(conn, cid, skb); | |
3929 | break; | |
3930 | } | |
3931 | } | |
3932 | ||
3933 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3934 | ||
3935 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3936 | { | |
3937 | int exact = 0, lm1 = 0, lm2 = 0; | |
3938 | register struct sock *sk; | |
3939 | struct hlist_node *node; | |
3940 | ||
3941 | if (type != ACL_LINK) | |
3942 | return 0; | |
3943 | ||
3944 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3945 | ||
3946 | /* Find listening sockets and check their link_mode */ | |
3947 | read_lock(&l2cap_sk_list.lock); | |
3948 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
3949 | if (sk->sk_state != BT_LISTEN) | |
3950 | continue; | |
3951 | ||
3952 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
3953 | lm1 |= HCI_LM_ACCEPT; |
3954 | if (l2cap_pi(sk)->role_switch) | |
3955 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 3956 | exact++; |
2af6b9d5 MH |
3957 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3958 | lm2 |= HCI_LM_ACCEPT; | |
3959 | if (l2cap_pi(sk)->role_switch) | |
3960 | lm2 |= HCI_LM_MASTER; | |
3961 | } | |
1da177e4 LT |
3962 | } |
3963 | read_unlock(&l2cap_sk_list.lock); | |
3964 | ||
3965 | return exact ? lm1 : lm2; | |
3966 | } | |
3967 | ||
3968 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3969 | { | |
0139418c MH |
3970 | struct l2cap_conn *conn; |
3971 | ||
1da177e4 LT |
3972 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3973 | ||
3974 | if (hcon->type != ACL_LINK) | |
3975 | return 0; | |
3976 | ||
3977 | if (!status) { | |
1da177e4 LT |
3978 | conn = l2cap_conn_add(hcon, status); |
3979 | if (conn) | |
3980 | l2cap_conn_ready(conn); | |
0139418c | 3981 | } else |
1da177e4 LT |
3982 | l2cap_conn_del(hcon, bt_err(status)); |
3983 | ||
3984 | return 0; | |
3985 | } | |
3986 | ||
2950f21a MH |
3987 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3988 | { | |
3989 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3990 | ||
3991 | BT_DBG("hcon %p", hcon); | |
3992 | ||
3993 | if (hcon->type != ACL_LINK || !conn) | |
3994 | return 0x13; | |
3995 | ||
3996 | return conn->disc_reason; | |
3997 | } | |
3998 | ||
3999 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4000 | { |
4001 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4002 | ||
4003 | if (hcon->type != ACL_LINK) | |
4004 | return 0; | |
4005 | ||
4006 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4007 | |
1da177e4 LT |
4008 | return 0; |
4009 | } | |
4010 | ||
f62e4323 MH |
4011 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
4012 | { | |
bd3c9e25 | 4013 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
4014 | return; |
4015 | ||
f62e4323 MH |
4016 | if (encrypt == 0x00) { |
4017 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
4018 | l2cap_sock_clear_timer(sk); | |
4019 | l2cap_sock_set_timer(sk, HZ * 5); | |
4020 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
4021 | __l2cap_sock_close(sk, ECONNREFUSED); | |
4022 | } else { | |
4023 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
4024 | l2cap_sock_clear_timer(sk); | |
4025 | } | |
4026 | } | |
4027 | ||
8c1b2355 | 4028 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
4029 | { |
4030 | struct l2cap_chan_list *l; | |
0139418c | 4031 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 4032 | struct sock *sk; |
1da177e4 | 4033 | |
0139418c | 4034 | if (!conn) |
1da177e4 | 4035 | return 0; |
0139418c | 4036 | |
1da177e4 LT |
4037 | l = &conn->chan_list; |
4038 | ||
4039 | BT_DBG("conn %p", conn); | |
4040 | ||
4041 | read_lock(&l->lock); | |
4042 | ||
4043 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
4044 | bh_lock_sock(sk); | |
4045 | ||
6a8d3010 MH |
4046 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
4047 | bh_unlock_sock(sk); | |
4048 | continue; | |
4049 | } | |
4050 | ||
f62e4323 | 4051 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 4052 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 4053 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
4054 | bh_unlock_sock(sk); |
4055 | continue; | |
4056 | } | |
4057 | ||
b1235d79 MH |
4058 | if (sk->sk_state == BT_CONNECT) { |
4059 | if (!status) { | |
4060 | struct l2cap_conn_req req; | |
4061 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4062 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 4063 | |
b1235d79 | 4064 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
1da177e4 | 4065 | |
b1235d79 MH |
4066 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4067 | L2CAP_CONN_REQ, sizeof(req), &req); | |
4068 | } else { | |
4069 | l2cap_sock_clear_timer(sk); | |
4070 | l2cap_sock_set_timer(sk, HZ / 10); | |
4071 | } | |
4072 | } else if (sk->sk_state == BT_CONNECT2) { | |
4073 | struct l2cap_conn_rsp rsp; | |
4074 | __u16 result; | |
1da177e4 | 4075 | |
b1235d79 MH |
4076 | if (!status) { |
4077 | sk->sk_state = BT_CONFIG; | |
4078 | result = L2CAP_CR_SUCCESS; | |
4079 | } else { | |
4080 | sk->sk_state = BT_DISCONN; | |
4081 | l2cap_sock_set_timer(sk, HZ / 10); | |
4082 | result = L2CAP_CR_SEC_BLOCK; | |
4083 | } | |
4084 | ||
4085 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
4086 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4087 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 4088 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
4089 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4090 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4091 | } | |
1da177e4 LT |
4092 | |
4093 | bh_unlock_sock(sk); | |
4094 | } | |
4095 | ||
4096 | read_unlock(&l->lock); | |
b1235d79 | 4097 | |
1da177e4 LT |
4098 | return 0; |
4099 | } | |
4100 | ||
4101 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4102 | { | |
4103 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4104 | ||
4105 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
4106 | goto drop; | |
4107 | ||
4108 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4109 | ||
4110 | if (flags & ACL_START) { | |
4111 | struct l2cap_hdr *hdr; | |
4112 | int len; | |
4113 | ||
4114 | if (conn->rx_len) { | |
4115 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4116 | kfree_skb(conn->rx_skb); | |
4117 | conn->rx_skb = NULL; | |
4118 | conn->rx_len = 0; | |
4119 | l2cap_conn_unreliable(conn, ECOMM); | |
4120 | } | |
4121 | ||
4122 | if (skb->len < 2) { | |
4123 | BT_ERR("Frame is too short (len %d)", skb->len); | |
4124 | l2cap_conn_unreliable(conn, ECOMM); | |
4125 | goto drop; | |
4126 | } | |
4127 | ||
4128 | hdr = (struct l2cap_hdr *) skb->data; | |
4129 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
4130 | ||
4131 | if (len == skb->len) { | |
4132 | /* Complete frame received */ | |
4133 | l2cap_recv_frame(conn, skb); | |
4134 | return 0; | |
4135 | } | |
4136 | ||
4137 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4138 | ||
4139 | if (skb->len > len) { | |
4140 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4141 | skb->len, len); | |
4142 | l2cap_conn_unreliable(conn, ECOMM); | |
4143 | goto drop; | |
4144 | } | |
4145 | ||
4146 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
4147 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4148 | if (!conn->rx_skb) | |
1da177e4 LT |
4149 | goto drop; |
4150 | ||
d626f62b | 4151 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4152 | skb->len); |
1da177e4 LT |
4153 | conn->rx_len = len - skb->len; |
4154 | } else { | |
4155 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4156 | ||
4157 | if (!conn->rx_len) { | |
4158 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4159 | l2cap_conn_unreliable(conn, ECOMM); | |
4160 | goto drop; | |
4161 | } | |
4162 | ||
4163 | if (skb->len > conn->rx_len) { | |
4164 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4165 | skb->len, conn->rx_len); | |
4166 | kfree_skb(conn->rx_skb); | |
4167 | conn->rx_skb = NULL; | |
4168 | conn->rx_len = 0; | |
4169 | l2cap_conn_unreliable(conn, ECOMM); | |
4170 | goto drop; | |
4171 | } | |
4172 | ||
d626f62b | 4173 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4174 | skb->len); |
1da177e4 LT |
4175 | conn->rx_len -= skb->len; |
4176 | ||
4177 | if (!conn->rx_len) { | |
4178 | /* Complete frame received */ | |
4179 | l2cap_recv_frame(conn, conn->rx_skb); | |
4180 | conn->rx_skb = NULL; | |
4181 | } | |
4182 | } | |
4183 | ||
4184 | drop: | |
4185 | kfree_skb(skb); | |
4186 | return 0; | |
4187 | } | |
4188 | ||
aef7d97c | 4189 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4190 | { |
4191 | struct sock *sk; | |
4192 | struct hlist_node *node; | |
1da177e4 LT |
4193 | |
4194 | read_lock_bh(&l2cap_sk_list.lock); | |
4195 | ||
be9d1227 MH |
4196 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4197 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4198 | |
aef7d97c MH |
4199 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
4200 | batostr(&bt_sk(sk)->src), | |
4201 | batostr(&bt_sk(sk)->dst), | |
4202 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4203 | pi->scid, pi->dcid, | |
4204 | pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 4205 | } |
1da177e4 | 4206 | |
1da177e4 | 4207 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4208 | |
aef7d97c | 4209 | return 0; |
1da177e4 LT |
4210 | } |
4211 | ||
aef7d97c MH |
4212 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4213 | { | |
4214 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4215 | } | |
4216 | ||
4217 | static const struct file_operations l2cap_debugfs_fops = { | |
4218 | .open = l2cap_debugfs_open, | |
4219 | .read = seq_read, | |
4220 | .llseek = seq_lseek, | |
4221 | .release = single_release, | |
4222 | }; | |
4223 | ||
4224 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4225 | |
90ddc4f0 | 4226 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
4227 | .family = PF_BLUETOOTH, |
4228 | .owner = THIS_MODULE, | |
4229 | .release = l2cap_sock_release, | |
4230 | .bind = l2cap_sock_bind, | |
4231 | .connect = l2cap_sock_connect, | |
4232 | .listen = l2cap_sock_listen, | |
4233 | .accept = l2cap_sock_accept, | |
4234 | .getname = l2cap_sock_getname, | |
4235 | .sendmsg = l2cap_sock_sendmsg, | |
f66dc81f | 4236 | .recvmsg = l2cap_sock_recvmsg, |
1da177e4 | 4237 | .poll = bt_sock_poll, |
3241ad82 | 4238 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
4239 | .mmap = sock_no_mmap, |
4240 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
4241 | .shutdown = l2cap_sock_shutdown, |
4242 | .setsockopt = l2cap_sock_setsockopt, | |
4243 | .getsockopt = l2cap_sock_getsockopt | |
4244 | }; | |
4245 | ||
ec1b4cf7 | 4246 | static const struct net_proto_family l2cap_sock_family_ops = { |
1da177e4 LT |
4247 | .family = PF_BLUETOOTH, |
4248 | .owner = THIS_MODULE, | |
4249 | .create = l2cap_sock_create, | |
4250 | }; | |
4251 | ||
4252 | static struct hci_proto l2cap_hci_proto = { | |
4253 | .name = "L2CAP", | |
4254 | .id = HCI_PROTO_L2CAP, | |
4255 | .connect_ind = l2cap_connect_ind, | |
4256 | .connect_cfm = l2cap_connect_cfm, | |
4257 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4258 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4259 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4260 | .recv_acldata = l2cap_recv_acldata |
4261 | }; | |
4262 | ||
4263 | static int __init l2cap_init(void) | |
4264 | { | |
4265 | int err; | |
be9d1227 | 4266 | |
1da177e4 LT |
4267 | err = proto_register(&l2cap_proto, 0); |
4268 | if (err < 0) | |
4269 | return err; | |
4270 | ||
4271 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); | |
4272 | if (err < 0) { | |
4273 | BT_ERR("L2CAP socket registration failed"); | |
4274 | goto error; | |
4275 | } | |
4276 | ||
4277 | err = hci_register_proto(&l2cap_hci_proto); | |
4278 | if (err < 0) { | |
4279 | BT_ERR("L2CAP protocol registration failed"); | |
4280 | bt_sock_unregister(BTPROTO_L2CAP); | |
4281 | goto error; | |
4282 | } | |
4283 | ||
aef7d97c MH |
4284 | if (bt_debugfs) { |
4285 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4286 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4287 | if (!l2cap_debugfs) | |
4288 | BT_ERR("Failed to create L2CAP debug file"); | |
4289 | } | |
1da177e4 LT |
4290 | |
4291 | BT_INFO("L2CAP ver %s", VERSION); | |
4292 | BT_INFO("L2CAP socket layer initialized"); | |
4293 | ||
4294 | return 0; | |
4295 | ||
4296 | error: | |
4297 | proto_unregister(&l2cap_proto); | |
4298 | return err; | |
4299 | } | |
4300 | ||
4301 | static void __exit l2cap_exit(void) | |
4302 | { | |
aef7d97c | 4303 | debugfs_remove(l2cap_debugfs); |
1da177e4 LT |
4304 | |
4305 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) | |
4306 | BT_ERR("L2CAP socket unregistration failed"); | |
4307 | ||
4308 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
4309 | BT_ERR("L2CAP protocol unregistration failed"); | |
4310 | ||
4311 | proto_unregister(&l2cap_proto); | |
4312 | } | |
4313 | ||
4314 | void l2cap_load(void) | |
4315 | { | |
4316 | /* Dummy function to trigger automatic L2CAP module loading by | |
4317 | * other modules that use L2CAP sockets but don't use any other | |
4318 | * symbols from it. */ | |
4319 | return; | |
4320 | } | |
4321 | EXPORT_SYMBOL(l2cap_load); | |
4322 | ||
4323 | module_init(l2cap_init); | |
4324 | module_exit(l2cap_exit); | |
4325 | ||
44dd46de MH |
4326 | module_param(enable_ertm, bool, 0644); |
4327 | MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); | |
4328 | ||
5fbcd3d1 MH |
4329 | module_param(max_transmit, uint, 0644); |
4330 | MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)"); | |
4331 | ||
369ba302 GP |
4332 | module_param(tx_window, uint, 0644); |
4333 | MODULE_PARM_DESC(tx_window, "Transmission window size value (default = 63)"); | |
4334 | ||
63fbd24e | 4335 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
4336 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4337 | MODULE_VERSION(VERSION); | |
4338 | MODULE_LICENSE("GPL"); | |
4339 | MODULE_ALIAS("bt-proto-0"); |