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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 | 70 | |
1890d36b GP |
71 | static struct workqueue_struct *_busy_wq; |
72 | ||
1da177e4 | 73 | static struct bt_sock_list l2cap_sk_list = { |
d5fb2962 | 74 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
75 | }; |
76 | ||
1890d36b GP |
77 | static void l2cap_busy_work(struct work_struct *work); |
78 | ||
1da177e4 LT |
79 | static void __l2cap_sock_close(struct sock *sk, int reason); |
80 | static void l2cap_sock_close(struct sock *sk); | |
81 | static void l2cap_sock_kill(struct sock *sk); | |
82 | ||
83 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
84 | u8 code, u8 ident, u16 dlen, void *data); | |
85 | ||
86 | /* ---- L2CAP timers ---- */ | |
87 | static void l2cap_sock_timeout(unsigned long arg) | |
88 | { | |
89 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 90 | int reason; |
1da177e4 LT |
91 | |
92 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
93 | ||
94 | bh_lock_sock(sk); | |
b1235d79 | 95 | |
f62e4323 MH |
96 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) |
97 | reason = ECONNREFUSED; | |
98 | else if (sk->sk_state == BT_CONNECT && | |
2af6b9d5 | 99 | l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) |
b1235d79 MH |
100 | reason = ECONNREFUSED; |
101 | else | |
102 | reason = ETIMEDOUT; | |
103 | ||
104 | __l2cap_sock_close(sk, reason); | |
105 | ||
1da177e4 LT |
106 | bh_unlock_sock(sk); |
107 | ||
108 | l2cap_sock_kill(sk); | |
109 | sock_put(sk); | |
110 | } | |
111 | ||
112 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
113 | { | |
114 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
115 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
116 | } | |
117 | ||
118 | static void l2cap_sock_clear_timer(struct sock *sk) | |
119 | { | |
120 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
121 | sk_stop_timer(sk, &sk->sk_timer); | |
122 | } | |
123 | ||
0139418c MH |
124 | /* ---- L2CAP channels ---- */ |
125 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
126 | { | |
127 | struct sock *s; | |
128 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
129 | if (l2cap_pi(s)->dcid == cid) | |
130 | break; | |
131 | } | |
132 | return s; | |
133 | } | |
134 | ||
135 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
136 | { | |
137 | struct sock *s; | |
138 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
139 | if (l2cap_pi(s)->scid == cid) | |
140 | break; | |
141 | } | |
142 | return s; | |
143 | } | |
144 | ||
145 | /* Find channel with given SCID. | |
146 | * Returns locked socket */ | |
147 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
148 | { | |
149 | struct sock *s; | |
150 | read_lock(&l->lock); | |
151 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
152 | if (s) |
153 | bh_lock_sock(s); | |
0139418c MH |
154 | read_unlock(&l->lock); |
155 | return s; | |
156 | } | |
157 | ||
158 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
159 | { | |
160 | struct sock *s; | |
161 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
162 | if (l2cap_pi(s)->ident == ident) | |
163 | break; | |
164 | } | |
165 | return s; | |
166 | } | |
167 | ||
168 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
169 | { | |
170 | struct sock *s; | |
171 | read_lock(&l->lock); | |
172 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
173 | if (s) |
174 | bh_lock_sock(s); | |
0139418c MH |
175 | read_unlock(&l->lock); |
176 | return s; | |
177 | } | |
178 | ||
179 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
180 | { | |
8db4dc46 | 181 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 182 | |
8db4dc46 | 183 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 184 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
185 | return cid; |
186 | } | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
192 | { | |
193 | sock_hold(sk); | |
194 | ||
195 | if (l->head) | |
196 | l2cap_pi(l->head)->prev_c = sk; | |
197 | ||
198 | l2cap_pi(sk)->next_c = l->head; | |
199 | l2cap_pi(sk)->prev_c = NULL; | |
200 | l->head = sk; | |
201 | } | |
202 | ||
203 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
204 | { | |
205 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
206 | ||
fd1278d7 | 207 | write_lock_bh(&l->lock); |
0139418c MH |
208 | if (sk == l->head) |
209 | l->head = next; | |
210 | ||
211 | if (next) | |
212 | l2cap_pi(next)->prev_c = prev; | |
213 | if (prev) | |
214 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 215 | write_unlock_bh(&l->lock); |
0139418c MH |
216 | |
217 | __sock_put(sk); | |
218 | } | |
219 | ||
220 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
221 | { | |
222 | struct l2cap_chan_list *l = &conn->chan_list; | |
223 | ||
af05b30b GP |
224 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
225 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 226 | |
2950f21a MH |
227 | conn->disc_reason = 0x13; |
228 | ||
0139418c MH |
229 | l2cap_pi(sk)->conn = conn; |
230 | ||
bd3c9e25 | 231 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
0139418c MH |
232 | /* Alloc CID for connection-oriented socket */ |
233 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
234 | } else if (sk->sk_type == SOCK_DGRAM) { | |
235 | /* Connectionless socket */ | |
8db4dc46 GP |
236 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
237 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
238 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
239 | } else { | |
240 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
241 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
242 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
243 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
244 | } | |
245 | ||
246 | __l2cap_chan_link(l, sk); | |
247 | ||
248 | if (parent) | |
249 | bt_accept_enqueue(parent, sk); | |
250 | } | |
251 | ||
8e87d142 | 252 | /* Delete channel. |
0139418c MH |
253 | * Must be called on the locked socket. */ |
254 | static void l2cap_chan_del(struct sock *sk, int err) | |
255 | { | |
256 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
257 | struct sock *parent = bt_sk(sk)->parent; | |
258 | ||
259 | l2cap_sock_clear_timer(sk); | |
260 | ||
261 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
262 | ||
8e87d142 | 263 | if (conn) { |
0139418c MH |
264 | /* Unlink from channel list */ |
265 | l2cap_chan_unlink(&conn->chan_list, sk); | |
266 | l2cap_pi(sk)->conn = NULL; | |
267 | hci_conn_put(conn->hcon); | |
268 | } | |
269 | ||
b1235d79 | 270 | sk->sk_state = BT_CLOSED; |
0139418c MH |
271 | sock_set_flag(sk, SOCK_ZAPPED); |
272 | ||
273 | if (err) | |
274 | sk->sk_err = err; | |
275 | ||
276 | if (parent) { | |
277 | bt_accept_unlink(sk); | |
278 | parent->sk_data_ready(parent, 0); | |
279 | } else | |
280 | sk->sk_state_change(sk); | |
281 | } | |
282 | ||
79d554a6 | 283 | /* Service level security */ |
2af6b9d5 | 284 | static inline int l2cap_check_security(struct sock *sk) |
79d554a6 MH |
285 | { |
286 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
0684e5f9 MH |
287 | __u8 auth_type; |
288 | ||
00ae4af9 MH |
289 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
290 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
291 | auth_type = HCI_AT_NO_BONDING_MITM; | |
292 | else | |
af05b30b | 293 | auth_type = HCI_AT_NO_BONDING; |
00ae4af9 MH |
294 | |
295 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
296 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
297 | } else { | |
298 | switch (l2cap_pi(sk)->sec_level) { | |
299 | case BT_SECURITY_HIGH: | |
300 | auth_type = HCI_AT_GENERAL_BONDING_MITM; | |
301 | break; | |
302 | case BT_SECURITY_MEDIUM: | |
303 | auth_type = HCI_AT_GENERAL_BONDING; | |
304 | break; | |
305 | default: | |
306 | auth_type = HCI_AT_NO_BONDING; | |
307 | break; | |
308 | } | |
0684e5f9 | 309 | } |
79d554a6 | 310 | |
0684e5f9 MH |
311 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
312 | auth_type); | |
79d554a6 MH |
313 | } |
314 | ||
4e8402a3 MH |
315 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
316 | { | |
317 | u8 id; | |
318 | ||
319 | /* Get next available identificator. | |
320 | * 1 - 128 are used by kernel. | |
321 | * 129 - 199 are reserved. | |
322 | * 200 - 254 are used by utilities like l2ping, etc. | |
323 | */ | |
324 | ||
325 | spin_lock_bh(&conn->lock); | |
326 | ||
327 | if (++conn->tx_ident > 128) | |
328 | conn->tx_ident = 1; | |
329 | ||
330 | id = conn->tx_ident; | |
331 | ||
332 | spin_unlock_bh(&conn->lock); | |
333 | ||
334 | return id; | |
335 | } | |
336 | ||
9a9c6a34 | 337 | static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
338 | { |
339 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
340 | ||
341 | BT_DBG("code 0x%2.2x", code); | |
342 | ||
343 | if (!skb) | |
9a9c6a34 | 344 | return; |
4e8402a3 | 345 | |
9a9c6a34 | 346 | hci_send_acl(conn->hcon, skb, 0); |
4e8402a3 MH |
347 | } |
348 | ||
9a9c6a34 | 349 | static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
1c2acffb GP |
350 | { |
351 | struct sk_buff *skb; | |
352 | struct l2cap_hdr *lh; | |
353 | struct l2cap_conn *conn = pi->conn; | |
fcc203c3 GP |
354 | int count, hlen = L2CAP_HDR_SIZE + 2; |
355 | ||
356 | if (pi->fcs == L2CAP_FCS_CRC16) | |
357 | hlen += 2; | |
1c2acffb GP |
358 | |
359 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
360 | ||
fcc203c3 | 361 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
362 | control |= L2CAP_CTRL_FRAME_TYPE; |
363 | ||
9e917af1 GP |
364 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
365 | control |= L2CAP_CTRL_FINAL; | |
366 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
367 | } | |
368 | ||
f0946ccf GP |
369 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
370 | control |= L2CAP_CTRL_POLL; | |
371 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
372 | } | |
373 | ||
1c2acffb GP |
374 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
375 | if (!skb) | |
9a9c6a34 | 376 | return; |
1c2acffb GP |
377 | |
378 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 379 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
380 | lh->cid = cpu_to_le16(pi->dcid); |
381 | put_unaligned_le16(control, skb_put(skb, 2)); | |
382 | ||
fcc203c3 GP |
383 | if (pi->fcs == L2CAP_FCS_CRC16) { |
384 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
385 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
386 | } | |
387 | ||
9a9c6a34 | 388 | hci_send_acl(pi->conn->hcon, skb, 0); |
1c2acffb GP |
389 | } |
390 | ||
9a9c6a34 | 391 | static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
7e743090 | 392 | { |
1890d36b | 393 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 394 | control |= L2CAP_SUPER_RCV_NOT_READY; |
1890d36b GP |
395 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
396 | } else | |
7e743090 GP |
397 | control |= L2CAP_SUPER_RCV_READY; |
398 | ||
2ab25cdd GP |
399 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
400 | ||
9a9c6a34 | 401 | l2cap_send_sframe(pi, control); |
7e743090 GP |
402 | } |
403 | ||
79d554a6 MH |
404 | static void l2cap_do_start(struct sock *sk) |
405 | { | |
406 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
407 | ||
408 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
409 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
410 | return; | |
411 | ||
2af6b9d5 | 412 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
413 | struct l2cap_conn_req req; |
414 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
415 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 416 | |
b1235d79 | 417 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 418 | |
b1235d79 | 419 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 420 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 421 | } |
79d554a6 MH |
422 | } else { |
423 | struct l2cap_info_req req; | |
424 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
425 | ||
426 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
427 | conn->info_ident = l2cap_get_ident(conn); | |
428 | ||
429 | mod_timer(&conn->info_timer, jiffies + | |
430 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
431 | ||
432 | l2cap_send_cmd(conn, conn->info_ident, | |
433 | L2CAP_INFO_REQ, sizeof(req), &req); | |
434 | } | |
435 | } | |
436 | ||
22121fc9 GP |
437 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk) |
438 | { | |
439 | struct l2cap_disconn_req req; | |
440 | ||
441 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
442 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
443 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
444 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
445 | } | |
446 | ||
1da177e4 | 447 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
448 | static void l2cap_conn_start(struct l2cap_conn *conn) |
449 | { | |
450 | struct l2cap_chan_list *l = &conn->chan_list; | |
451 | struct sock *sk; | |
452 | ||
453 | BT_DBG("conn %p", conn); | |
454 | ||
455 | read_lock(&l->lock); | |
456 | ||
457 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
458 | bh_lock_sock(sk); | |
459 | ||
bd3c9e25 GP |
460 | if (sk->sk_type != SOCK_SEQPACKET && |
461 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
462 | bh_unlock_sock(sk); |
463 | continue; | |
464 | } | |
465 | ||
466 | if (sk->sk_state == BT_CONNECT) { | |
2af6b9d5 | 467 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
468 | struct l2cap_conn_req req; |
469 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
470 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 471 | |
b1235d79 | 472 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 473 | |
b1235d79 | 474 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 475 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 476 | } |
79d554a6 MH |
477 | } else if (sk->sk_state == BT_CONNECT2) { |
478 | struct l2cap_conn_rsp rsp; | |
479 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
480 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
481 | ||
2af6b9d5 | 482 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
483 | if (bt_sk(sk)->defer_setup) { |
484 | struct sock *parent = bt_sk(sk)->parent; | |
485 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
486 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
487 | parent->sk_data_ready(parent, 0); | |
488 | ||
489 | } else { | |
490 | sk->sk_state = BT_CONFIG; | |
491 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
492 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
493 | } | |
79d554a6 MH |
494 | } else { |
495 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
496 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
497 | } | |
498 | ||
499 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
500 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
501 | } |
502 | ||
503 | bh_unlock_sock(sk); | |
504 | } | |
505 | ||
506 | read_unlock(&l->lock); | |
507 | } | |
508 | ||
509 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
510 | { | |
79d554a6 MH |
511 | struct l2cap_chan_list *l = &conn->chan_list; |
512 | struct sock *sk; | |
4e8402a3 | 513 | |
79d554a6 | 514 | BT_DBG("conn %p", conn); |
4e8402a3 | 515 | |
79d554a6 | 516 | read_lock(&l->lock); |
4e8402a3 | 517 | |
79d554a6 MH |
518 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
519 | bh_lock_sock(sk); | |
4e8402a3 | 520 | |
bd3c9e25 GP |
521 | if (sk->sk_type != SOCK_SEQPACKET && |
522 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
523 | l2cap_sock_clear_timer(sk); |
524 | sk->sk_state = BT_CONNECTED; | |
525 | sk->sk_state_change(sk); | |
526 | } else if (sk->sk_state == BT_CONNECT) | |
527 | l2cap_do_start(sk); | |
4e8402a3 | 528 | |
79d554a6 | 529 | bh_unlock_sock(sk); |
4e8402a3 | 530 | } |
79d554a6 MH |
531 | |
532 | read_unlock(&l->lock); | |
4e8402a3 MH |
533 | } |
534 | ||
535 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
536 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
537 | { | |
538 | struct l2cap_chan_list *l = &conn->chan_list; | |
539 | struct sock *sk; | |
540 | ||
541 | BT_DBG("conn %p", conn); | |
542 | ||
543 | read_lock(&l->lock); | |
544 | ||
545 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 546 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
547 | sk->sk_err = err; |
548 | } | |
549 | ||
550 | read_unlock(&l->lock); | |
551 | } | |
552 | ||
553 | static void l2cap_info_timeout(unsigned long arg) | |
554 | { | |
555 | struct l2cap_conn *conn = (void *) arg; | |
556 | ||
984947dc | 557 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 558 | conn->info_ident = 0; |
984947dc | 559 | |
4e8402a3 MH |
560 | l2cap_conn_start(conn); |
561 | } | |
562 | ||
1da177e4 LT |
563 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
564 | { | |
0139418c | 565 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 566 | |
0139418c | 567 | if (conn || status) |
1da177e4 LT |
568 | return conn; |
569 | ||
0139418c MH |
570 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
571 | if (!conn) | |
1da177e4 | 572 | return NULL; |
1da177e4 LT |
573 | |
574 | hcon->l2cap_data = conn; | |
575 | conn->hcon = hcon; | |
576 | ||
0139418c MH |
577 | BT_DBG("hcon %p conn %p", hcon, conn); |
578 | ||
1da177e4 LT |
579 | conn->mtu = hcon->hdev->acl_mtu; |
580 | conn->src = &hcon->hdev->bdaddr; | |
581 | conn->dst = &hcon->dst; | |
582 | ||
4e8402a3 MH |
583 | conn->feat_mask = 0; |
584 | ||
1da177e4 LT |
585 | spin_lock_init(&conn->lock); |
586 | rwlock_init(&conn->chan_list.lock); | |
587 | ||
45054dc1 DY |
588 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
589 | (unsigned long) conn); | |
590 | ||
2950f21a MH |
591 | conn->disc_reason = 0x13; |
592 | ||
1da177e4 LT |
593 | return conn; |
594 | } | |
595 | ||
0139418c | 596 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 597 | { |
0139418c | 598 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
599 | struct sock *sk; |
600 | ||
0139418c MH |
601 | if (!conn) |
602 | return; | |
1da177e4 LT |
603 | |
604 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
605 | ||
7585b97a | 606 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
607 | |
608 | /* Kill channels */ | |
609 | while ((sk = conn->chan_list.head)) { | |
610 | bh_lock_sock(sk); | |
611 | l2cap_chan_del(sk, err); | |
612 | bh_unlock_sock(sk); | |
613 | l2cap_sock_kill(sk); | |
614 | } | |
615 | ||
8e8440f5 DY |
616 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
617 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 618 | |
1da177e4 LT |
619 | hcon->l2cap_data = NULL; |
620 | kfree(conn); | |
1da177e4 LT |
621 | } |
622 | ||
623 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
624 | { | |
625 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 626 | write_lock_bh(&l->lock); |
1da177e4 | 627 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 628 | write_unlock_bh(&l->lock); |
1da177e4 LT |
629 | } |
630 | ||
1da177e4 | 631 | /* ---- Socket interface ---- */ |
8e036fc3 | 632 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
633 | { |
634 | struct sock *sk; | |
635 | struct hlist_node *node; | |
636 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
637 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
638 | goto found; | |
639 | sk = NULL; | |
640 | found: | |
641 | return sk; | |
642 | } | |
643 | ||
644 | /* Find socket with psm and source bdaddr. | |
645 | * Returns closest match. | |
646 | */ | |
8e036fc3 | 647 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
648 | { |
649 | struct sock *sk = NULL, *sk1 = NULL; | |
650 | struct hlist_node *node; | |
651 | ||
652 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
653 | if (state && sk->sk_state != state) | |
654 | continue; | |
655 | ||
656 | if (l2cap_pi(sk)->psm == psm) { | |
657 | /* Exact match. */ | |
658 | if (!bacmp(&bt_sk(sk)->src, src)) | |
659 | break; | |
660 | ||
661 | /* Closest match */ | |
662 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
663 | sk1 = sk; | |
664 | } | |
665 | } | |
666 | return node ? sk : sk1; | |
667 | } | |
668 | ||
669 | /* Find socket with given address (psm, src). | |
670 | * Returns locked socket */ | |
8e036fc3 | 671 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
672 | { |
673 | struct sock *s; | |
674 | read_lock(&l2cap_sk_list.lock); | |
675 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
af05b30b GP |
676 | if (s) |
677 | bh_lock_sock(s); | |
1da177e4 LT |
678 | read_unlock(&l2cap_sk_list.lock); |
679 | return s; | |
680 | } | |
681 | ||
682 | static void l2cap_sock_destruct(struct sock *sk) | |
683 | { | |
684 | BT_DBG("sk %p", sk); | |
685 | ||
686 | skb_queue_purge(&sk->sk_receive_queue); | |
687 | skb_queue_purge(&sk->sk_write_queue); | |
688 | } | |
689 | ||
690 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
691 | { | |
692 | struct sock *sk; | |
693 | ||
694 | BT_DBG("parent %p", parent); | |
695 | ||
696 | /* Close not yet accepted channels */ | |
697 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
698 | l2cap_sock_close(sk); | |
699 | ||
b1235d79 | 700 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
701 | sock_set_flag(parent, SOCK_ZAPPED); |
702 | } | |
703 | ||
704 | /* Kill socket (only if zapped and orphan) | |
705 | * Must be called on unlocked socket. | |
706 | */ | |
707 | static void l2cap_sock_kill(struct sock *sk) | |
708 | { | |
709 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
710 | return; | |
711 | ||
712 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
713 | ||
714 | /* Kill poor orphan */ | |
715 | bt_sock_unlink(&l2cap_sk_list, sk); | |
716 | sock_set_flag(sk, SOCK_DEAD); | |
717 | sock_put(sk); | |
718 | } | |
719 | ||
720 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
721 | { | |
722 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
723 | ||
724 | switch (sk->sk_state) { | |
725 | case BT_LISTEN: | |
726 | l2cap_sock_cleanup_listen(sk); | |
727 | break; | |
728 | ||
729 | case BT_CONNECTED: | |
730 | case BT_CONFIG: | |
bd3c9e25 GP |
731 | if (sk->sk_type == SOCK_SEQPACKET || |
732 | sk->sk_type == SOCK_STREAM) { | |
1da177e4 | 733 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1da177e4 LT |
734 | |
735 | sk->sk_state = BT_DISCONN; | |
736 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
22121fc9 | 737 | l2cap_send_disconn_req(conn, sk); |
b1235d79 | 738 | } else |
1da177e4 | 739 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
740 | break; |
741 | ||
f66dc81f | 742 | case BT_CONNECT2: |
bd3c9e25 GP |
743 | if (sk->sk_type == SOCK_SEQPACKET || |
744 | sk->sk_type == SOCK_STREAM) { | |
f66dc81f MH |
745 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
746 | struct l2cap_conn_rsp rsp; | |
747 | __u16 result; | |
748 | ||
749 | if (bt_sk(sk)->defer_setup) | |
750 | result = L2CAP_CR_SEC_BLOCK; | |
751 | else | |
752 | result = L2CAP_CR_BAD_PSM; | |
753 | ||
754 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
755 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
756 | rsp.result = cpu_to_le16(result); | |
757 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
758 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
759 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
760 | } else | |
761 | l2cap_chan_del(sk, reason); | |
762 | break; | |
763 | ||
1da177e4 LT |
764 | case BT_CONNECT: |
765 | case BT_DISCONN: | |
766 | l2cap_chan_del(sk, reason); | |
767 | break; | |
768 | ||
769 | default: | |
770 | sock_set_flag(sk, SOCK_ZAPPED); | |
771 | break; | |
772 | } | |
773 | } | |
774 | ||
775 | /* Must be called on unlocked socket. */ | |
776 | static void l2cap_sock_close(struct sock *sk) | |
777 | { | |
778 | l2cap_sock_clear_timer(sk); | |
779 | lock_sock(sk); | |
780 | __l2cap_sock_close(sk, ECONNRESET); | |
781 | release_sock(sk); | |
782 | l2cap_sock_kill(sk); | |
783 | } | |
784 | ||
785 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
786 | { | |
787 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
788 | ||
789 | BT_DBG("sk %p", sk); | |
790 | ||
791 | if (parent) { | |
792 | sk->sk_type = parent->sk_type; | |
f66dc81f MH |
793 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
794 | ||
1da177e4 LT |
795 | pi->imtu = l2cap_pi(parent)->imtu; |
796 | pi->omtu = l2cap_pi(parent)->omtu; | |
c6b03cf9 MH |
797 | pi->mode = l2cap_pi(parent)->mode; |
798 | pi->fcs = l2cap_pi(parent)->fcs; | |
68d7f0ce | 799 | pi->max_tx = l2cap_pi(parent)->max_tx; |
14b5aa71 | 800 | pi->tx_win = l2cap_pi(parent)->tx_win; |
2af6b9d5 MH |
801 | pi->sec_level = l2cap_pi(parent)->sec_level; |
802 | pi->role_switch = l2cap_pi(parent)->role_switch; | |
803 | pi->force_reliable = l2cap_pi(parent)->force_reliable; | |
1da177e4 LT |
804 | } else { |
805 | pi->imtu = L2CAP_DEFAULT_MTU; | |
806 | pi->omtu = 0; | |
bd3c9e25 GP |
807 | if (enable_ertm && sk->sk_type == SOCK_STREAM) |
808 | pi->mode = L2CAP_MODE_ERTM; | |
809 | else | |
810 | pi->mode = L2CAP_MODE_BASIC; | |
68d7f0ce | 811 | pi->max_tx = max_transmit; |
c6b03cf9 | 812 | pi->fcs = L2CAP_FCS_CRC16; |
369ba302 | 813 | pi->tx_win = tx_window; |
2af6b9d5 MH |
814 | pi->sec_level = BT_SECURITY_LOW; |
815 | pi->role_switch = 0; | |
816 | pi->force_reliable = 0; | |
1da177e4 LT |
817 | } |
818 | ||
819 | /* Default config options */ | |
5dee9e7c | 820 | pi->conf_len = 0; |
1da177e4 | 821 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
45054dc1 DY |
822 | skb_queue_head_init(TX_QUEUE(sk)); |
823 | skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 824 | skb_queue_head_init(BUSY_QUEUE(sk)); |
45054dc1 | 825 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
1da177e4 LT |
826 | } |
827 | ||
828 | static struct proto l2cap_proto = { | |
829 | .name = "L2CAP", | |
830 | .owner = THIS_MODULE, | |
831 | .obj_size = sizeof(struct l2cap_pinfo) | |
832 | }; | |
833 | ||
1b8d7ae4 | 834 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
835 | { |
836 | struct sock *sk; | |
837 | ||
6257ff21 | 838 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
839 | if (!sk) |
840 | return NULL; | |
841 | ||
842 | sock_init_data(sock, sk); | |
843 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
844 | ||
845 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 846 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
847 | |
848 | sock_reset_flag(sk, SOCK_ZAPPED); | |
849 | ||
850 | sk->sk_protocol = proto; | |
b1235d79 | 851 | sk->sk_state = BT_OPEN; |
1da177e4 | 852 | |
b1235d79 | 853 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
854 | |
855 | bt_sock_link(&l2cap_sk_list, sk); | |
856 | return sk; | |
857 | } | |
858 | ||
3f378b68 EP |
859 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
860 | int kern) | |
1da177e4 LT |
861 | { |
862 | struct sock *sk; | |
863 | ||
864 | BT_DBG("sock %p", sock); | |
865 | ||
866 | sock->state = SS_UNCONNECTED; | |
867 | ||
bd3c9e25 | 868 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && |
1da177e4 LT |
869 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
870 | return -ESOCKTNOSUPPORT; | |
871 | ||
c84b3268 | 872 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
1da177e4 LT |
873 | return -EPERM; |
874 | ||
875 | sock->ops = &l2cap_sock_ops; | |
876 | ||
1b8d7ae4 | 877 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
878 | if (!sk) |
879 | return -ENOMEM; | |
880 | ||
881 | l2cap_sock_init(sk, NULL); | |
882 | return 0; | |
883 | } | |
884 | ||
f29972de | 885 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
1da177e4 | 886 | { |
1da177e4 | 887 | struct sock *sk = sock->sk; |
f29972de MH |
888 | struct sockaddr_l2 la; |
889 | int len, err = 0; | |
1da177e4 | 890 | |
f29972de | 891 | BT_DBG("sk %p", sk); |
1da177e4 LT |
892 | |
893 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
894 | return -EINVAL; | |
895 | ||
f29972de MH |
896 | memset(&la, 0, sizeof(la)); |
897 | len = min_t(unsigned int, sizeof(la), alen); | |
898 | memcpy(&la, addr, len); | |
899 | ||
2a517ca6 MH |
900 | if (la.l2_cid) |
901 | return -EINVAL; | |
902 | ||
1da177e4 LT |
903 | lock_sock(sk); |
904 | ||
905 | if (sk->sk_state != BT_OPEN) { | |
906 | err = -EBADFD; | |
907 | goto done; | |
908 | } | |
909 | ||
b4324b5d | 910 | if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && |
847641d7 MH |
911 | !capable(CAP_NET_BIND_SERVICE)) { |
912 | err = -EACCES; | |
913 | goto done; | |
914 | } | |
8e87d142 | 915 | |
1da177e4 LT |
916 | write_lock_bh(&l2cap_sk_list.lock); |
917 | ||
f29972de | 918 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
1da177e4 LT |
919 | err = -EADDRINUSE; |
920 | } else { | |
921 | /* Save source address */ | |
f29972de MH |
922 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
923 | l2cap_pi(sk)->psm = la.l2_psm; | |
924 | l2cap_pi(sk)->sport = la.l2_psm; | |
1da177e4 | 925 | sk->sk_state = BT_BOUND; |
2af6b9d5 | 926 | |
b4324b5d MH |
927 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
928 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
2af6b9d5 | 929 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
1da177e4 LT |
930 | } |
931 | ||
932 | write_unlock_bh(&l2cap_sk_list.lock); | |
933 | ||
934 | done: | |
935 | release_sock(sk); | |
936 | return err; | |
937 | } | |
938 | ||
939 | static int l2cap_do_connect(struct sock *sk) | |
940 | { | |
941 | bdaddr_t *src = &bt_sk(sk)->src; | |
942 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
943 | struct l2cap_conn *conn; | |
944 | struct hci_conn *hcon; | |
945 | struct hci_dev *hdev; | |
09ab6f4c | 946 | __u8 auth_type; |
44d0e48e | 947 | int err; |
1da177e4 | 948 | |
f29972de MH |
949 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
950 | l2cap_pi(sk)->psm); | |
1da177e4 | 951 | |
af05b30b GP |
952 | hdev = hci_get_route(dst, src); |
953 | if (!hdev) | |
1da177e4 LT |
954 | return -EHOSTUNREACH; |
955 | ||
956 | hci_dev_lock_bh(hdev); | |
957 | ||
958 | err = -ENOMEM; | |
959 | ||
8c1b2355 | 960 | if (sk->sk_type == SOCK_RAW) { |
2af6b9d5 MH |
961 | switch (l2cap_pi(sk)->sec_level) { |
962 | case BT_SECURITY_HIGH: | |
8c1b2355 | 963 | auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
2af6b9d5 MH |
964 | break; |
965 | case BT_SECURITY_MEDIUM: | |
8c1b2355 | 966 | auth_type = HCI_AT_DEDICATED_BONDING; |
2af6b9d5 MH |
967 | break; |
968 | default: | |
09ab6f4c | 969 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
970 | break; |
971 | } | |
8c1b2355 | 972 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
2af6b9d5 | 973 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8c1b2355 | 974 | auth_type = HCI_AT_NO_BONDING_MITM; |
09ab6f4c | 975 | else |
8c1b2355 | 976 | auth_type = HCI_AT_NO_BONDING; |
435fef20 MH |
977 | |
978 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
979 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
8c1b2355 | 980 | } else { |
2af6b9d5 MH |
981 | switch (l2cap_pi(sk)->sec_level) { |
982 | case BT_SECURITY_HIGH: | |
8c1b2355 | 983 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
2af6b9d5 MH |
984 | break; |
985 | case BT_SECURITY_MEDIUM: | |
09ab6f4c | 986 | auth_type = HCI_AT_GENERAL_BONDING; |
2af6b9d5 MH |
987 | break; |
988 | default: | |
8c1b2355 | 989 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
990 | break; |
991 | } | |
09ab6f4c MH |
992 | } |
993 | ||
2af6b9d5 MH |
994 | hcon = hci_connect(hdev, ACL_LINK, dst, |
995 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
996 | if (!hcon) |
997 | goto done; | |
998 | ||
999 | conn = l2cap_conn_add(hcon, 0); | |
1000 | if (!conn) { | |
1001 | hci_conn_put(hcon); | |
1002 | goto done; | |
1003 | } | |
1004 | ||
1005 | err = 0; | |
1006 | ||
1007 | /* Update source addr of the socket */ | |
1008 | bacpy(src, conn->src); | |
1009 | ||
1010 | l2cap_chan_add(conn, sk, NULL); | |
1011 | ||
1012 | sk->sk_state = BT_CONNECT; | |
1013 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1014 | ||
1015 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
1016 | if (sk->sk_type != SOCK_SEQPACKET && |
1017 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 LT |
1018 | l2cap_sock_clear_timer(sk); |
1019 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
1020 | } else |
1021 | l2cap_do_start(sk); | |
1da177e4 LT |
1022 | } |
1023 | ||
1024 | done: | |
1025 | hci_dev_unlock_bh(hdev); | |
1026 | hci_dev_put(hdev); | |
1027 | return err; | |
1028 | } | |
1029 | ||
1030 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
1031 | { | |
1da177e4 | 1032 | struct sock *sk = sock->sk; |
f29972de MH |
1033 | struct sockaddr_l2 la; |
1034 | int len, err = 0; | |
1da177e4 | 1035 | |
1da177e4 LT |
1036 | BT_DBG("sk %p", sk); |
1037 | ||
6503d961 CG |
1038 | if (!addr || alen < sizeof(addr->sa_family) || |
1039 | addr->sa_family != AF_BLUETOOTH) | |
2a517ca6 | 1040 | return -EINVAL; |
1da177e4 | 1041 | |
f29972de MH |
1042 | memset(&la, 0, sizeof(la)); |
1043 | len = min_t(unsigned int, sizeof(la), alen); | |
1044 | memcpy(&la, addr, len); | |
1045 | ||
2a517ca6 MH |
1046 | if (la.l2_cid) |
1047 | return -EINVAL; | |
1048 | ||
1049 | lock_sock(sk); | |
1050 | ||
bd3c9e25 GP |
1051 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) |
1052 | && !la.l2_psm) { | |
1da177e4 LT |
1053 | err = -EINVAL; |
1054 | goto done; | |
1055 | } | |
1056 | ||
c6b03cf9 MH |
1057 | switch (l2cap_pi(sk)->mode) { |
1058 | case L2CAP_MODE_BASIC: | |
1059 | break; | |
1060 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1061 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1062 | if (enable_ertm) |
1063 | break; | |
1064 | /* fall through */ | |
1065 | default: | |
1066 | err = -ENOTSUPP; | |
1067 | goto done; | |
1068 | } | |
1069 | ||
af05b30b | 1070 | switch (sk->sk_state) { |
1da177e4 LT |
1071 | case BT_CONNECT: |
1072 | case BT_CONNECT2: | |
1073 | case BT_CONFIG: | |
1074 | /* Already connecting */ | |
1075 | goto wait; | |
1076 | ||
1077 | case BT_CONNECTED: | |
1078 | /* Already connected */ | |
1079 | goto done; | |
1080 | ||
1081 | case BT_OPEN: | |
1082 | case BT_BOUND: | |
1083 | /* Can connect */ | |
1084 | break; | |
1085 | ||
1086 | default: | |
1087 | err = -EBADFD; | |
1088 | goto done; | |
1089 | } | |
1090 | ||
1091 | /* Set destination address and psm */ | |
f29972de MH |
1092 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1093 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 1094 | |
af05b30b GP |
1095 | err = l2cap_do_connect(sk); |
1096 | if (err) | |
1da177e4 LT |
1097 | goto done; |
1098 | ||
1099 | wait: | |
1100 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
1101 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
1102 | done: | |
1103 | release_sock(sk); | |
1104 | return err; | |
1105 | } | |
1106 | ||
1107 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
1108 | { | |
1109 | struct sock *sk = sock->sk; | |
1110 | int err = 0; | |
1111 | ||
1112 | BT_DBG("sk %p backlog %d", sk, backlog); | |
1113 | ||
1114 | lock_sock(sk); | |
1115 | ||
bd3c9e25 GP |
1116 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) |
1117 | || sk->sk_state != BT_BOUND) { | |
1da177e4 LT |
1118 | err = -EBADFD; |
1119 | goto done; | |
1120 | } | |
1121 | ||
c6b03cf9 MH |
1122 | switch (l2cap_pi(sk)->mode) { |
1123 | case L2CAP_MODE_BASIC: | |
1124 | break; | |
1125 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1126 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1127 | if (enable_ertm) |
1128 | break; | |
1129 | /* fall through */ | |
1130 | default: | |
1131 | err = -ENOTSUPP; | |
1132 | goto done; | |
1133 | } | |
1134 | ||
1da177e4 LT |
1135 | if (!l2cap_pi(sk)->psm) { |
1136 | bdaddr_t *src = &bt_sk(sk)->src; | |
1137 | u16 psm; | |
1138 | ||
1139 | err = -EINVAL; | |
1140 | ||
1141 | write_lock_bh(&l2cap_sk_list.lock); | |
1142 | ||
1143 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
b4324b5d MH |
1144 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1145 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
1146 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
1da177e4 LT |
1147 | err = 0; |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | write_unlock_bh(&l2cap_sk_list.lock); | |
1152 | ||
1153 | if (err < 0) | |
1154 | goto done; | |
1155 | } | |
1156 | ||
1157 | sk->sk_max_ack_backlog = backlog; | |
1158 | sk->sk_ack_backlog = 0; | |
1159 | sk->sk_state = BT_LISTEN; | |
1160 | ||
1161 | done: | |
1162 | release_sock(sk); | |
1163 | return err; | |
1164 | } | |
1165 | ||
1166 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1167 | { | |
1168 | DECLARE_WAITQUEUE(wait, current); | |
1169 | struct sock *sk = sock->sk, *nsk; | |
1170 | long timeo; | |
1171 | int err = 0; | |
1172 | ||
fcc70d5f | 1173 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1174 | |
1175 | if (sk->sk_state != BT_LISTEN) { | |
1176 | err = -EBADFD; | |
1177 | goto done; | |
1178 | } | |
1179 | ||
1180 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1181 | ||
1182 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1183 | ||
1184 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 1185 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
1da177e4 LT |
1186 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1187 | set_current_state(TASK_INTERRUPTIBLE); | |
1188 | if (!timeo) { | |
1189 | err = -EAGAIN; | |
1190 | break; | |
1191 | } | |
1192 | ||
1193 | release_sock(sk); | |
1194 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1195 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1196 | |
1197 | if (sk->sk_state != BT_LISTEN) { | |
1198 | err = -EBADFD; | |
1199 | break; | |
1200 | } | |
1201 | ||
1202 | if (signal_pending(current)) { | |
1203 | err = sock_intr_errno(timeo); | |
1204 | break; | |
1205 | } | |
1206 | } | |
1207 | set_current_state(TASK_RUNNING); | |
aa395145 | 1208 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
1209 | |
1210 | if (err) | |
1211 | goto done; | |
1212 | ||
1213 | newsock->state = SS_CONNECTED; | |
1214 | ||
1215 | BT_DBG("new socket %p", nsk); | |
1216 | ||
1217 | done: | |
1218 | release_sock(sk); | |
1219 | return err; | |
1220 | } | |
1221 | ||
1222 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
1223 | { | |
1224 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1225 | struct sock *sk = sock->sk; | |
1226 | ||
1227 | BT_DBG("sock %p, sk %p", sock, sk); | |
1228 | ||
1229 | addr->sa_family = AF_BLUETOOTH; | |
1230 | *len = sizeof(struct sockaddr_l2); | |
1231 | ||
f29972de MH |
1232 | if (peer) { |
1233 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1234 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1235 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1236 | } else { |
1237 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1238 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1239 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1240 | } |
1da177e4 | 1241 | |
1da177e4 LT |
1242 | return 0; |
1243 | } | |
1244 | ||
6161c038 GP |
1245 | static int __l2cap_wait_ack(struct sock *sk) |
1246 | { | |
1247 | DECLARE_WAITQUEUE(wait, current); | |
1248 | int err = 0; | |
1249 | int timeo = HZ/5; | |
1250 | ||
1251 | add_wait_queue(sk->sk_sleep, &wait); | |
1252 | while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { | |
1253 | set_current_state(TASK_INTERRUPTIBLE); | |
1254 | ||
1255 | if (!timeo) | |
1256 | timeo = HZ/5; | |
1257 | ||
1258 | if (signal_pending(current)) { | |
1259 | err = sock_intr_errno(timeo); | |
1260 | break; | |
1261 | } | |
1262 | ||
1263 | release_sock(sk); | |
1264 | timeo = schedule_timeout(timeo); | |
1265 | lock_sock(sk); | |
1266 | ||
1267 | err = sock_error(sk); | |
1268 | if (err) | |
1269 | break; | |
1270 | } | |
1271 | set_current_state(TASK_RUNNING); | |
1272 | remove_wait_queue(sk->sk_sleep, &wait); | |
1273 | return err; | |
1274 | } | |
1275 | ||
e90bac06 GP |
1276 | static void l2cap_monitor_timeout(unsigned long arg) |
1277 | { | |
1278 | struct sock *sk = (void *) arg; | |
e90bac06 | 1279 | |
e686219a | 1280 | bh_lock_sock(sk); |
e90bac06 GP |
1281 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
1282 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk); | |
b13f5860 | 1283 | bh_unlock_sock(sk); |
e90bac06 GP |
1284 | return; |
1285 | } | |
1286 | ||
1287 | l2cap_pi(sk)->retry_count++; | |
1288 | __mod_monitor_timer(); | |
1289 | ||
a2e12a2a | 1290 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1291 | bh_unlock_sock(sk); |
e90bac06 GP |
1292 | } |
1293 | ||
1294 | static void l2cap_retrans_timeout(unsigned long arg) | |
1295 | { | |
1296 | struct sock *sk = (void *) arg; | |
e90bac06 | 1297 | |
e686219a | 1298 | bh_lock_sock(sk); |
e90bac06 GP |
1299 | l2cap_pi(sk)->retry_count = 1; |
1300 | __mod_monitor_timer(); | |
1301 | ||
1302 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
1303 | ||
a2e12a2a | 1304 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1305 | bh_unlock_sock(sk); |
e90bac06 GP |
1306 | } |
1307 | ||
1c2acffb | 1308 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 1309 | { |
1c2acffb | 1310 | struct sk_buff *skb; |
1da177e4 | 1311 | |
812e737e GP |
1312 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
1313 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
1314 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1315 | break; | |
1da177e4 | 1316 | |
1c2acffb GP |
1317 | skb = skb_dequeue(TX_QUEUE(sk)); |
1318 | kfree_skb(skb); | |
1da177e4 | 1319 | |
1c2acffb GP |
1320 | l2cap_pi(sk)->unacked_frames--; |
1321 | } | |
1da177e4 | 1322 | |
e90bac06 GP |
1323 | if (!l2cap_pi(sk)->unacked_frames) |
1324 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1325 | ||
1c2acffb GP |
1326 | return; |
1327 | } | |
1da177e4 | 1328 | |
9a9c6a34 | 1329 | static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1330 | { |
1331 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1c2acffb GP |
1332 | |
1333 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1334 | |
9a9c6a34 | 1335 | hci_send_acl(pi->conn->hcon, skb, 0); |
1c2acffb GP |
1336 | } |
1337 | ||
6840ed07 GP |
1338 | static int l2cap_streaming_send(struct sock *sk) |
1339 | { | |
1340 | struct sk_buff *skb, *tx_skb; | |
1341 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1342 | u16 control, fcs; |
6840ed07 GP |
1343 | |
1344 | while ((skb = sk->sk_send_head)) { | |
1345 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1346 | ||
1347 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
1348 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; | |
1349 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1350 | ||
e8235c6b | 1351 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1352 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1353 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1354 | } | |
1355 | ||
9a9c6a34 | 1356 | l2cap_do_send(sk, tx_skb); |
6840ed07 GP |
1357 | |
1358 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1359 | ||
1360 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1361 | sk->sk_send_head = NULL; | |
1362 | else | |
1363 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
1364 | ||
1365 | skb = skb_dequeue(TX_QUEUE(sk)); | |
1366 | kfree_skb(skb); | |
1367 | } | |
1368 | return 0; | |
1369 | } | |
1370 | ||
dfc909be | 1371 | static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) |
8f17154f GP |
1372 | { |
1373 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1374 | struct sk_buff *skb, *tx_skb; | |
1375 | u16 control, fcs; | |
8f17154f GP |
1376 | |
1377 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1378 | if (!skb) |
1379 | return; | |
8f17154f | 1380 | |
f11d676d GP |
1381 | do { |
1382 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1383 | break; |
8f17154f | 1384 | |
f11d676d GP |
1385 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1386 | return; | |
8f17154f | 1387 | |
f11d676d | 1388 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1389 | |
f11d676d GP |
1390 | if (pi->remote_max_tx && |
1391 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
1392 | l2cap_send_disconn_req(pi->conn, sk); | |
1393 | return; | |
1394 | } | |
1395 | ||
1396 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1397 | bt_cb(skb)->retries++; | |
1398 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
1399 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) | |
1400 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1401 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1402 | ||
1403 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1404 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1405 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1406 | } | |
1407 | ||
1408 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1409 | } |
1410 | ||
1c2acffb GP |
1411 | static int l2cap_ertm_send(struct sock *sk) |
1412 | { | |
1413 | struct sk_buff *skb, *tx_skb; | |
1414 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1415 | u16 control, fcs; |
9a9c6a34 | 1416 | int nsent = 0; |
1c2acffb | 1417 | |
e90bac06 GP |
1418 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
1419 | return 0; | |
1420 | ||
f64f9e71 | 1421 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) && |
59203a21 | 1422 | !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) { |
1c2acffb | 1423 | |
e90bac06 GP |
1424 | if (pi->remote_max_tx && |
1425 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
1426 | l2cap_send_disconn_req(pi->conn, sk); | |
1427 | break; | |
1428 | } | |
1429 | ||
e420aba3 AE |
1430 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1431 | ||
e90bac06 GP |
1432 | bt_cb(skb)->retries++; |
1433 | ||
1c2acffb | 1434 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
d5392c8f GP |
1435 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1436 | control |= L2CAP_CTRL_FINAL; | |
1437 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1438 | } | |
9f121a5a | 1439 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1440 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1441 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1442 | ||
e90bac06 | 1443 | |
e8235c6b | 1444 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1445 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1446 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1447 | } | |
1448 | ||
9a9c6a34 GP |
1449 | l2cap_do_send(sk, tx_skb); |
1450 | ||
e90bac06 | 1451 | __mod_retrans_timer(); |
1c2acffb GP |
1452 | |
1453 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1454 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1455 | ||
1456 | pi->unacked_frames++; | |
d5392c8f | 1457 | pi->frames_sent++; |
1c2acffb GP |
1458 | |
1459 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1460 | sk->sk_send_head = NULL; | |
1461 | else | |
1462 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1463 | |
1464 | nsent++; | |
1c2acffb GP |
1465 | } |
1466 | ||
9e917af1 GP |
1467 | return nsent; |
1468 | } | |
1469 | ||
dfc909be GP |
1470 | static int l2cap_retransmit_frames(struct sock *sk) |
1471 | { | |
1472 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1473 | int ret; | |
1474 | ||
1475 | spin_lock_bh(&pi->send_lock); | |
1476 | ||
1477 | if (!skb_queue_empty(TX_QUEUE(sk))) | |
1478 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1479 | ||
1480 | pi->next_tx_seq = pi->expected_ack_seq; | |
1481 | ret = l2cap_ertm_send(sk); | |
1482 | ||
1483 | spin_unlock_bh(&pi->send_lock); | |
1484 | ||
1485 | return ret; | |
1486 | } | |
1487 | ||
9a9c6a34 | 1488 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1489 | { |
1490 | struct sock *sk = (struct sock *)pi; | |
1491 | u16 control = 0; | |
dfc909be | 1492 | int nframes; |
9e917af1 GP |
1493 | |
1494 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1495 | ||
1496 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1497 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1498 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1499 | l2cap_send_sframe(pi, control); |
1500 | return; | |
9e917af1 | 1501 | } |
dfc909be GP |
1502 | |
1503 | spin_lock_bh(&pi->send_lock); | |
1504 | nframes = l2cap_ertm_send(sk); | |
1505 | spin_unlock_bh(&pi->send_lock); | |
1506 | ||
1507 | if (nframes > 0) | |
1508 | return; | |
1509 | ||
1510 | control |= L2CAP_SUPER_RCV_READY; | |
1511 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1512 | } |
1513 | ||
9a9c6a34 | 1514 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1515 | { |
1516 | struct srej_list *tail; | |
1517 | u16 control; | |
1518 | ||
1519 | control = L2CAP_SUPER_SELECT_REJECT; | |
1520 | control |= L2CAP_CTRL_FINAL; | |
1521 | ||
1522 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1523 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1524 | ||
1525 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1526 | } |
1527 | ||
1c2acffb GP |
1528 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1529 | { | |
1530 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1531 | struct sk_buff **frag; | |
1532 | int err, sent = 0; | |
1da177e4 | 1533 | |
59203a21 | 1534 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1535 | return -EFAULT; |
1da177e4 LT |
1536 | |
1537 | sent += count; | |
1538 | len -= count; | |
1539 | ||
1540 | /* Continuation fragments (no L2CAP header) */ | |
1541 | frag = &skb_shinfo(skb)->frag_list; | |
1542 | while (len) { | |
1543 | count = min_t(unsigned int, conn->mtu, len); | |
1544 | ||
1545 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1546 | if (!*frag) | |
1c2acffb GP |
1547 | return -EFAULT; |
1548 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) | |
1549 | return -EFAULT; | |
1da177e4 LT |
1550 | |
1551 | sent += count; | |
1552 | len -= count; | |
1553 | ||
1554 | frag = &(*frag)->next; | |
1555 | } | |
1da177e4 LT |
1556 | |
1557 | return sent; | |
1c2acffb | 1558 | } |
1da177e4 | 1559 | |
1c2acffb GP |
1560 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1561 | { | |
1562 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1563 | struct sk_buff *skb; | |
1564 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1565 | struct l2cap_hdr *lh; | |
1566 | ||
1567 | BT_DBG("sk %p len %d", sk, (int)len); | |
1568 | ||
1569 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1570 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1571 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1572 | if (!skb) | |
1573 | return ERR_PTR(-ENOMEM); | |
1574 | ||
1575 | /* Create L2CAP header */ | |
1576 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1577 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1578 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1579 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1580 | ||
1581 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1582 | if (unlikely(err < 0)) { | |
1583 | kfree_skb(skb); | |
1584 | return ERR_PTR(err); | |
1585 | } | |
1586 | return skb; | |
1587 | } | |
1588 | ||
1589 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) | |
1590 | { | |
1591 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1592 | struct sk_buff *skb; | |
1593 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1594 | struct l2cap_hdr *lh; | |
1595 | ||
1596 | BT_DBG("sk %p len %d", sk, (int)len); | |
1597 | ||
1598 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1599 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1600 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1601 | if (!skb) | |
1602 | return ERR_PTR(-ENOMEM); | |
1603 | ||
1604 | /* Create L2CAP header */ | |
1605 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1606 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1607 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1608 | ||
1609 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1610 | if (unlikely(err < 0)) { | |
1611 | kfree_skb(skb); | |
1612 | return ERR_PTR(err); | |
1613 | } | |
1614 | return skb; | |
1615 | } | |
1616 | ||
6840ed07 | 1617 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1618 | { |
1619 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1620 | struct sk_buff *skb; | |
1621 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1622 | struct l2cap_hdr *lh; | |
1623 | ||
1624 | BT_DBG("sk %p len %d", sk, (int)len); | |
1625 | ||
0ee0d208 GP |
1626 | if (!conn) |
1627 | return ERR_PTR(-ENOTCONN); | |
1628 | ||
c74e560c GP |
1629 | if (sdulen) |
1630 | hlen += 2; | |
1631 | ||
fcc203c3 GP |
1632 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1633 | hlen += 2; | |
1634 | ||
1c2acffb GP |
1635 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1636 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1637 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1638 | if (!skb) | |
1639 | return ERR_PTR(-ENOMEM); | |
1640 | ||
1641 | /* Create L2CAP header */ | |
1642 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1643 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1644 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1645 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1646 | if (sdulen) |
1647 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1648 | |
1649 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1650 | if (unlikely(err < 0)) { | |
1651 | kfree_skb(skb); | |
1652 | return ERR_PTR(err); | |
1653 | } | |
e90bac06 | 1654 | |
fcc203c3 GP |
1655 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1656 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1657 | ||
e90bac06 | 1658 | bt_cb(skb)->retries = 0; |
1c2acffb | 1659 | return skb; |
1da177e4 LT |
1660 | } |
1661 | ||
c74e560c GP |
1662 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1663 | { | |
1664 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1665 | struct sk_buff *skb; | |
1666 | struct sk_buff_head sar_queue; | |
1667 | u16 control; | |
1668 | size_t size = 0; | |
1669 | ||
ff12fd64 | 1670 | skb_queue_head_init(&sar_queue); |
c74e560c | 1671 | control = L2CAP_SDU_START; |
1c762159 | 1672 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1673 | if (IS_ERR(skb)) |
1674 | return PTR_ERR(skb); | |
1675 | ||
1676 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1677 | len -= pi->remote_mps; |
1678 | size += pi->remote_mps; | |
c74e560c GP |
1679 | |
1680 | while (len > 0) { | |
1681 | size_t buflen; | |
1682 | ||
1c762159 | 1683 | if (len > pi->remote_mps) { |
44651b85 | 1684 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1685 | buflen = pi->remote_mps; |
c74e560c | 1686 | } else { |
44651b85 | 1687 | control = L2CAP_SDU_END; |
c74e560c GP |
1688 | buflen = len; |
1689 | } | |
1690 | ||
6840ed07 | 1691 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1692 | if (IS_ERR(skb)) { |
1693 | skb_queue_purge(&sar_queue); | |
1694 | return PTR_ERR(skb); | |
1695 | } | |
1696 | ||
1697 | __skb_queue_tail(&sar_queue, skb); | |
1698 | len -= buflen; | |
1699 | size += buflen; | |
c74e560c GP |
1700 | } |
1701 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
dfc909be | 1702 | spin_lock_bh(&pi->send_lock); |
c74e560c GP |
1703 | if (sk->sk_send_head == NULL) |
1704 | sk->sk_send_head = sar_queue.next; | |
dfc909be | 1705 | spin_unlock_bh(&pi->send_lock); |
c74e560c GP |
1706 | |
1707 | return size; | |
1708 | } | |
1709 | ||
1da177e4 LT |
1710 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1711 | { | |
1712 | struct sock *sk = sock->sk; | |
1c2acffb GP |
1713 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1714 | struct sk_buff *skb; | |
1715 | u16 control; | |
1716 | int err; | |
1da177e4 LT |
1717 | |
1718 | BT_DBG("sock %p, sk %p", sock, sk); | |
1719 | ||
c1cbe4b7 BL |
1720 | err = sock_error(sk); |
1721 | if (err) | |
1722 | return err; | |
1da177e4 LT |
1723 | |
1724 | if (msg->msg_flags & MSG_OOB) | |
1725 | return -EOPNOTSUPP; | |
1726 | ||
1da177e4 LT |
1727 | lock_sock(sk); |
1728 | ||
1c2acffb | 1729 | if (sk->sk_state != BT_CONNECTED) { |
1da177e4 | 1730 | err = -ENOTCONN; |
1c2acffb GP |
1731 | goto done; |
1732 | } | |
1da177e4 | 1733 | |
1c2acffb GP |
1734 | /* Connectionless channel */ |
1735 | if (sk->sk_type == SOCK_DGRAM) { | |
1736 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
9a9c6a34 | 1737 | if (IS_ERR(skb)) { |
477fffb0 | 1738 | err = PTR_ERR(skb); |
9a9c6a34 GP |
1739 | } else { |
1740 | l2cap_do_send(sk, skb); | |
1741 | err = len; | |
1742 | } | |
1c2acffb GP |
1743 | goto done; |
1744 | } | |
1745 | ||
1746 | switch (pi->mode) { | |
1747 | case L2CAP_MODE_BASIC: | |
c69163e9 GP |
1748 | /* Check outgoing MTU */ |
1749 | if (len > pi->omtu) { | |
1750 | err = -EINVAL; | |
1751 | goto done; | |
1752 | } | |
1753 | ||
1c2acffb GP |
1754 | /* Create a basic PDU */ |
1755 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
1756 | if (IS_ERR(skb)) { | |
1757 | err = PTR_ERR(skb); | |
1758 | goto done; | |
1759 | } | |
1760 | ||
9a9c6a34 GP |
1761 | l2cap_do_send(sk, skb); |
1762 | err = len; | |
1c2acffb GP |
1763 | break; |
1764 | ||
1765 | case L2CAP_MODE_ERTM: | |
6840ed07 | 1766 | case L2CAP_MODE_STREAMING: |
1c2acffb | 1767 | /* Entire SDU fits into one PDU */ |
1c762159 | 1768 | if (len <= pi->remote_mps) { |
1c2acffb | 1769 | control = L2CAP_SDU_UNSEGMENTED; |
6840ed07 | 1770 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1c2acffb GP |
1771 | if (IS_ERR(skb)) { |
1772 | err = PTR_ERR(skb); | |
1773 | goto done; | |
1774 | } | |
c74e560c | 1775 | __skb_queue_tail(TX_QUEUE(sk), skb); |
dfc909be GP |
1776 | |
1777 | if (pi->mode == L2CAP_MODE_ERTM) | |
1778 | spin_lock_bh(&pi->send_lock); | |
1779 | ||
c74e560c GP |
1780 | if (sk->sk_send_head == NULL) |
1781 | sk->sk_send_head = skb; | |
dfc909be GP |
1782 | |
1783 | if (pi->mode == L2CAP_MODE_ERTM) | |
1784 | spin_unlock_bh(&pi->send_lock); | |
1c2acffb | 1785 | } else { |
c74e560c GP |
1786 | /* Segment SDU into multiples PDUs */ |
1787 | err = l2cap_sar_segment_sdu(sk, msg, len); | |
1788 | if (err < 0) | |
1789 | goto done; | |
1c2acffb | 1790 | } |
1c2acffb | 1791 | |
dfc909be | 1792 | if (pi->mode == L2CAP_MODE_STREAMING) { |
6840ed07 | 1793 | err = l2cap_streaming_send(sk); |
dfc909be GP |
1794 | } else { |
1795 | spin_lock_bh(&pi->send_lock); | |
6840ed07 | 1796 | err = l2cap_ertm_send(sk); |
dfc909be GP |
1797 | spin_unlock_bh(&pi->send_lock); |
1798 | } | |
6840ed07 | 1799 | |
9e917af1 | 1800 | if (err >= 0) |
1c2acffb GP |
1801 | err = len; |
1802 | break; | |
1803 | ||
1804 | default: | |
1805 | BT_DBG("bad state %1.1x", pi->mode); | |
1806 | err = -EINVAL; | |
1807 | } | |
1808 | ||
1809 | done: | |
1da177e4 LT |
1810 | release_sock(sk); |
1811 | return err; | |
1812 | } | |
1813 | ||
f66dc81f MH |
1814 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1815 | { | |
1816 | struct sock *sk = sock->sk; | |
1817 | ||
1818 | lock_sock(sk); | |
1819 | ||
1820 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1821 | struct l2cap_conn_rsp rsp; | |
1822 | ||
1823 | sk->sk_state = BT_CONFIG; | |
1824 | ||
1825 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1826 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1827 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1828 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1829 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1830 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1831 | ||
1832 | release_sock(sk); | |
1833 | return 0; | |
1834 | } | |
1835 | ||
1836 | release_sock(sk); | |
1837 | ||
1838 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); | |
1839 | } | |
1840 | ||
b7058842 | 1841 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1842 | { |
1843 | struct sock *sk = sock->sk; | |
1844 | struct l2cap_options opts; | |
f29972de | 1845 | int len, err = 0; |
1da177e4 LT |
1846 | u32 opt; |
1847 | ||
1848 | BT_DBG("sk %p", sk); | |
1849 | ||
1850 | lock_sock(sk); | |
1851 | ||
1852 | switch (optname) { | |
1853 | case L2CAP_OPTIONS: | |
0878b666 MH |
1854 | opts.imtu = l2cap_pi(sk)->imtu; |
1855 | opts.omtu = l2cap_pi(sk)->omtu; | |
1856 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1857 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1858 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1859 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1860 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
0878b666 | 1861 | |
1da177e4 LT |
1862 | len = min_t(unsigned int, sizeof(opts), optlen); |
1863 | if (copy_from_user((char *) &opts, optval, len)) { | |
1864 | err = -EFAULT; | |
1865 | break; | |
1866 | } | |
0878b666 | 1867 | |
0041ecfa JPRV |
1868 | l2cap_pi(sk)->mode = opts.mode; |
1869 | switch (l2cap_pi(sk)->mode) { | |
1870 | case L2CAP_MODE_BASIC: | |
1871 | break; | |
1872 | case L2CAP_MODE_ERTM: | |
1873 | case L2CAP_MODE_STREAMING: | |
1874 | if (enable_ertm) | |
1875 | break; | |
1876 | /* fall through */ | |
1877 | default: | |
1878 | err = -EINVAL; | |
1879 | break; | |
1880 | } | |
1881 | ||
c6b03cf9 MH |
1882 | l2cap_pi(sk)->imtu = opts.imtu; |
1883 | l2cap_pi(sk)->omtu = opts.omtu; | |
fcc203c3 | 1884 | l2cap_pi(sk)->fcs = opts.fcs; |
68d7f0ce | 1885 | l2cap_pi(sk)->max_tx = opts.max_tx; |
14b5aa71 | 1886 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; |
1da177e4 LT |
1887 | break; |
1888 | ||
1889 | case L2CAP_LM: | |
1890 | if (get_user(opt, (u32 __user *) optval)) { | |
1891 | err = -EFAULT; | |
1892 | break; | |
1893 | } | |
1894 | ||
2af6b9d5 MH |
1895 | if (opt & L2CAP_LM_AUTH) |
1896 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
1897 | if (opt & L2CAP_LM_ENCRYPT) | |
1898 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
1899 | if (opt & L2CAP_LM_SECURE) | |
1900 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
1901 | ||
1902 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
1903 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
1904 | break; |
1905 | ||
1906 | default: | |
1907 | err = -ENOPROTOOPT; | |
1908 | break; | |
1909 | } | |
1910 | ||
1911 | release_sock(sk); | |
1912 | return err; | |
1913 | } | |
1914 | ||
b7058842 | 1915 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
1916 | { |
1917 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
1918 | struct bt_security sec; |
1919 | int len, err = 0; | |
f66dc81f | 1920 | u32 opt; |
d58daf42 MH |
1921 | |
1922 | BT_DBG("sk %p", sk); | |
1923 | ||
1924 | if (level == SOL_L2CAP) | |
1925 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
1926 | ||
0588d94f MH |
1927 | if (level != SOL_BLUETOOTH) |
1928 | return -ENOPROTOOPT; | |
1929 | ||
d58daf42 MH |
1930 | lock_sock(sk); |
1931 | ||
1932 | switch (optname) { | |
2af6b9d5 | 1933 | case BT_SECURITY: |
bd3c9e25 GP |
1934 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
1935 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
1936 | err = -EINVAL; |
1937 | break; | |
1938 | } | |
1939 | ||
2af6b9d5 MH |
1940 | sec.level = BT_SECURITY_LOW; |
1941 | ||
1942 | len = min_t(unsigned int, sizeof(sec), optlen); | |
1943 | if (copy_from_user((char *) &sec, optval, len)) { | |
1944 | err = -EFAULT; | |
1945 | break; | |
1946 | } | |
1947 | ||
1948 | if (sec.level < BT_SECURITY_LOW || | |
1949 | sec.level > BT_SECURITY_HIGH) { | |
1950 | err = -EINVAL; | |
1951 | break; | |
1952 | } | |
1953 | ||
1954 | l2cap_pi(sk)->sec_level = sec.level; | |
1955 | break; | |
1956 | ||
f66dc81f MH |
1957 | case BT_DEFER_SETUP: |
1958 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
1959 | err = -EINVAL; | |
1960 | break; | |
1961 | } | |
1962 | ||
1963 | if (get_user(opt, (u32 __user *) optval)) { | |
1964 | err = -EFAULT; | |
1965 | break; | |
1966 | } | |
1967 | ||
1968 | bt_sk(sk)->defer_setup = opt; | |
1969 | break; | |
1970 | ||
d58daf42 MH |
1971 | default: |
1972 | err = -ENOPROTOOPT; | |
1973 | break; | |
1974 | } | |
1975 | ||
1976 | release_sock(sk); | |
1977 | return err; | |
1978 | } | |
1979 | ||
1980 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
1981 | { |
1982 | struct sock *sk = sock->sk; | |
1983 | struct l2cap_options opts; | |
1984 | struct l2cap_conninfo cinfo; | |
1985 | int len, err = 0; | |
2af6b9d5 | 1986 | u32 opt; |
1da177e4 LT |
1987 | |
1988 | BT_DBG("sk %p", sk); | |
1989 | ||
1990 | if (get_user(len, optlen)) | |
1991 | return -EFAULT; | |
1992 | ||
1993 | lock_sock(sk); | |
1994 | ||
1995 | switch (optname) { | |
1996 | case L2CAP_OPTIONS: | |
1997 | opts.imtu = l2cap_pi(sk)->imtu; | |
1998 | opts.omtu = l2cap_pi(sk)->omtu; | |
1999 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 2000 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 2001 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 2002 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 2003 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
1da177e4 LT |
2004 | |
2005 | len = min_t(unsigned int, len, sizeof(opts)); | |
2006 | if (copy_to_user(optval, (char *) &opts, len)) | |
2007 | err = -EFAULT; | |
2008 | ||
2009 | break; | |
2010 | ||
2011 | case L2CAP_LM: | |
2af6b9d5 MH |
2012 | switch (l2cap_pi(sk)->sec_level) { |
2013 | case BT_SECURITY_LOW: | |
2014 | opt = L2CAP_LM_AUTH; | |
2015 | break; | |
2016 | case BT_SECURITY_MEDIUM: | |
2017 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
2018 | break; | |
2019 | case BT_SECURITY_HIGH: | |
2020 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
2021 | L2CAP_LM_SECURE; | |
2022 | break; | |
2023 | default: | |
2024 | opt = 0; | |
2025 | break; | |
2026 | } | |
2027 | ||
2028 | if (l2cap_pi(sk)->role_switch) | |
2029 | opt |= L2CAP_LM_MASTER; | |
2030 | ||
2031 | if (l2cap_pi(sk)->force_reliable) | |
2032 | opt |= L2CAP_LM_RELIABLE; | |
2033 | ||
2034 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
2035 | err = -EFAULT; |
2036 | break; | |
2037 | ||
2038 | case L2CAP_CONNINFO: | |
f66dc81f MH |
2039 | if (sk->sk_state != BT_CONNECTED && |
2040 | !(sk->sk_state == BT_CONNECT2 && | |
2041 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
2042 | err = -ENOTCONN; |
2043 | break; | |
2044 | } | |
2045 | ||
2046 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
2047 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
2048 | ||
2049 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
2050 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
2051 | err = -EFAULT; | |
2052 | ||
2053 | break; | |
2054 | ||
2055 | default: | |
2056 | err = -ENOPROTOOPT; | |
2057 | break; | |
2058 | } | |
2059 | ||
2060 | release_sock(sk); | |
2061 | return err; | |
2062 | } | |
2063 | ||
d58daf42 MH |
2064 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
2065 | { | |
2066 | struct sock *sk = sock->sk; | |
2af6b9d5 | 2067 | struct bt_security sec; |
d58daf42 MH |
2068 | int len, err = 0; |
2069 | ||
2070 | BT_DBG("sk %p", sk); | |
2071 | ||
2072 | if (level == SOL_L2CAP) | |
2073 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
2074 | ||
0588d94f MH |
2075 | if (level != SOL_BLUETOOTH) |
2076 | return -ENOPROTOOPT; | |
2077 | ||
d58daf42 MH |
2078 | if (get_user(len, optlen)) |
2079 | return -EFAULT; | |
2080 | ||
2081 | lock_sock(sk); | |
2082 | ||
2083 | switch (optname) { | |
2af6b9d5 | 2084 | case BT_SECURITY: |
bd3c9e25 GP |
2085 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2086 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2087 | err = -EINVAL; |
2088 | break; | |
2089 | } | |
2090 | ||
2af6b9d5 MH |
2091 | sec.level = l2cap_pi(sk)->sec_level; |
2092 | ||
2093 | len = min_t(unsigned int, len, sizeof(sec)); | |
2094 | if (copy_to_user(optval, (char *) &sec, len)) | |
2095 | err = -EFAULT; | |
2096 | ||
2097 | break; | |
2098 | ||
f66dc81f MH |
2099 | case BT_DEFER_SETUP: |
2100 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2101 | err = -EINVAL; | |
2102 | break; | |
2103 | } | |
2104 | ||
2105 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
2106 | err = -EFAULT; | |
2107 | ||
2108 | break; | |
2109 | ||
d58daf42 MH |
2110 | default: |
2111 | err = -ENOPROTOOPT; | |
2112 | break; | |
2113 | } | |
2114 | ||
2115 | release_sock(sk); | |
2116 | return err; | |
2117 | } | |
2118 | ||
1da177e4 LT |
2119 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
2120 | { | |
2121 | struct sock *sk = sock->sk; | |
2122 | int err = 0; | |
2123 | ||
2124 | BT_DBG("sock %p, sk %p", sock, sk); | |
2125 | ||
2126 | if (!sk) | |
2127 | return 0; | |
2128 | ||
2129 | lock_sock(sk); | |
2130 | if (!sk->sk_shutdown) { | |
6161c038 GP |
2131 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2132 | err = __l2cap_wait_ack(sk); | |
2133 | ||
1da177e4 LT |
2134 | sk->sk_shutdown = SHUTDOWN_MASK; |
2135 | l2cap_sock_clear_timer(sk); | |
2136 | __l2cap_sock_close(sk, 0); | |
2137 | ||
2138 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
2139 | err = bt_sock_wait_state(sk, BT_CLOSED, |
2140 | sk->sk_lingertime); | |
1da177e4 LT |
2141 | } |
2142 | release_sock(sk); | |
2143 | return err; | |
2144 | } | |
2145 | ||
2146 | static int l2cap_sock_release(struct socket *sock) | |
2147 | { | |
2148 | struct sock *sk = sock->sk; | |
2149 | int err; | |
2150 | ||
2151 | BT_DBG("sock %p, sk %p", sock, sk); | |
2152 | ||
2153 | if (!sk) | |
2154 | return 0; | |
2155 | ||
2156 | err = l2cap_sock_shutdown(sock, 2); | |
2157 | ||
2158 | sock_orphan(sk); | |
2159 | l2cap_sock_kill(sk); | |
2160 | return err; | |
2161 | } | |
2162 | ||
1da177e4 LT |
2163 | static void l2cap_chan_ready(struct sock *sk) |
2164 | { | |
2165 | struct sock *parent = bt_sk(sk)->parent; | |
2166 | ||
2167 | BT_DBG("sk %p, parent %p", sk, parent); | |
2168 | ||
2169 | l2cap_pi(sk)->conf_state = 0; | |
2170 | l2cap_sock_clear_timer(sk); | |
2171 | ||
2172 | if (!parent) { | |
2173 | /* Outgoing channel. | |
2174 | * Wake up socket sleeping on connect. | |
2175 | */ | |
2176 | sk->sk_state = BT_CONNECTED; | |
2177 | sk->sk_state_change(sk); | |
2178 | } else { | |
2179 | /* Incoming channel. | |
2180 | * Wake up socket sleeping on accept. | |
2181 | */ | |
2182 | parent->sk_data_ready(parent, 0); | |
2183 | } | |
2184 | } | |
2185 | ||
2186 | /* Copy frame to all raw sockets on that connection */ | |
2187 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2188 | { | |
2189 | struct l2cap_chan_list *l = &conn->chan_list; | |
2190 | struct sk_buff *nskb; | |
af05b30b | 2191 | struct sock *sk; |
1da177e4 LT |
2192 | |
2193 | BT_DBG("conn %p", conn); | |
2194 | ||
2195 | read_lock(&l->lock); | |
2196 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2197 | if (sk->sk_type != SOCK_RAW) | |
2198 | continue; | |
2199 | ||
2200 | /* Don't send frame to the socket it came from */ | |
2201 | if (skb->sk == sk) | |
2202 | continue; | |
af05b30b GP |
2203 | nskb = skb_clone(skb, GFP_ATOMIC); |
2204 | if (!nskb) | |
1da177e4 LT |
2205 | continue; |
2206 | ||
2207 | if (sock_queue_rcv_skb(sk, nskb)) | |
2208 | kfree_skb(nskb); | |
2209 | } | |
2210 | read_unlock(&l->lock); | |
2211 | } | |
2212 | ||
2213 | /* ---- L2CAP signalling commands ---- */ | |
2214 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2215 | u8 code, u8 ident, u16 dlen, void *data) | |
2216 | { | |
2217 | struct sk_buff *skb, **frag; | |
2218 | struct l2cap_cmd_hdr *cmd; | |
2219 | struct l2cap_hdr *lh; | |
2220 | int len, count; | |
2221 | ||
af05b30b GP |
2222 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2223 | conn, code, ident, dlen); | |
1da177e4 LT |
2224 | |
2225 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2226 | count = min_t(unsigned int, conn->mtu, len); | |
2227 | ||
2228 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2229 | if (!skb) | |
2230 | return NULL; | |
2231 | ||
2232 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2233 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 2234 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2235 | |
2236 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2237 | cmd->code = code; | |
2238 | cmd->ident = ident; | |
aca3192c | 2239 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2240 | |
2241 | if (dlen) { | |
2242 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2243 | memcpy(skb_put(skb, count), data, count); | |
2244 | data += count; | |
2245 | } | |
2246 | ||
2247 | len -= skb->len; | |
2248 | ||
2249 | /* Continuation fragments (no L2CAP header) */ | |
2250 | frag = &skb_shinfo(skb)->frag_list; | |
2251 | while (len) { | |
2252 | count = min_t(unsigned int, conn->mtu, len); | |
2253 | ||
2254 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2255 | if (!*frag) | |
2256 | goto fail; | |
2257 | ||
2258 | memcpy(skb_put(*frag, count), data, count); | |
2259 | ||
2260 | len -= count; | |
2261 | data += count; | |
2262 | ||
2263 | frag = &(*frag)->next; | |
2264 | } | |
2265 | ||
2266 | return skb; | |
2267 | ||
2268 | fail: | |
2269 | kfree_skb(skb); | |
2270 | return NULL; | |
2271 | } | |
2272 | ||
2273 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2274 | { | |
2275 | struct l2cap_conf_opt *opt = *ptr; | |
2276 | int len; | |
2277 | ||
2278 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2279 | *ptr += len; | |
2280 | ||
2281 | *type = opt->type; | |
2282 | *olen = opt->len; | |
2283 | ||
2284 | switch (opt->len) { | |
2285 | case 1: | |
2286 | *val = *((u8 *) opt->val); | |
2287 | break; | |
2288 | ||
2289 | case 2: | |
861d6882 | 2290 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
2291 | break; |
2292 | ||
2293 | case 4: | |
861d6882 | 2294 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
2295 | break; |
2296 | ||
2297 | default: | |
2298 | *val = (unsigned long) opt->val; | |
2299 | break; | |
2300 | } | |
2301 | ||
2302 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2303 | return len; | |
2304 | } | |
2305 | ||
1da177e4 LT |
2306 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2307 | { | |
2308 | struct l2cap_conf_opt *opt = *ptr; | |
2309 | ||
2310 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2311 | ||
2312 | opt->type = type; | |
2313 | opt->len = len; | |
2314 | ||
2315 | switch (len) { | |
2316 | case 1: | |
2317 | *((u8 *) opt->val) = val; | |
2318 | break; | |
2319 | ||
2320 | case 2: | |
8e036fc3 | 2321 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
2322 | break; |
2323 | ||
2324 | case 4: | |
8e036fc3 | 2325 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
2326 | break; |
2327 | ||
2328 | default: | |
2329 | memcpy(opt->val, (void *) val, len); | |
2330 | break; | |
2331 | } | |
2332 | ||
2333 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2334 | } | |
2335 | ||
c1b4f43b GP |
2336 | static void l2cap_ack_timeout(unsigned long arg) |
2337 | { | |
2338 | struct sock *sk = (void *) arg; | |
2339 | ||
2340 | bh_lock_sock(sk); | |
2341 | l2cap_send_ack(l2cap_pi(sk)); | |
2342 | bh_unlock_sock(sk); | |
2343 | } | |
2344 | ||
0565c1c2 GP |
2345 | static inline void l2cap_ertm_init(struct sock *sk) |
2346 | { | |
2347 | l2cap_pi(sk)->expected_ack_seq = 0; | |
2348 | l2cap_pi(sk)->unacked_frames = 0; | |
2349 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 2350 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 2351 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
2352 | |
2353 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
2354 | l2cap_retrans_timeout, (unsigned long) sk); | |
2355 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
2356 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
2357 | setup_timer(&l2cap_pi(sk)->ack_timer, |
2358 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
2359 | |
2360 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 2361 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
dfc909be | 2362 | spin_lock_init(&l2cap_pi(sk)->send_lock); |
1890d36b GP |
2363 | |
2364 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
0565c1c2 GP |
2365 | } |
2366 | ||
f2fcfcd6 GP |
2367 | static int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
2368 | { | |
2369 | u32 local_feat_mask = l2cap_feat_mask; | |
2370 | if (enable_ertm) | |
6840ed07 | 2371 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
f2fcfcd6 GP |
2372 | |
2373 | switch (mode) { | |
2374 | case L2CAP_MODE_ERTM: | |
2375 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
2376 | case L2CAP_MODE_STREAMING: | |
2377 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
2378 | default: | |
2379 | return 0x00; | |
2380 | } | |
2381 | } | |
2382 | ||
2383 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) | |
2384 | { | |
2385 | switch (mode) { | |
2386 | case L2CAP_MODE_STREAMING: | |
2387 | case L2CAP_MODE_ERTM: | |
2388 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2389 | return mode; | |
2390 | /* fall through */ | |
2391 | default: | |
2392 | return L2CAP_MODE_BASIC; | |
2393 | } | |
2394 | } | |
2395 | ||
1da177e4 LT |
2396 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2397 | { | |
2398 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2399 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 2400 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
2401 | void *ptr = req->data; |
2402 | ||
2403 | BT_DBG("sk %p", sk); | |
2404 | ||
f2fcfcd6 GP |
2405 | if (pi->num_conf_req || pi->num_conf_rsp) |
2406 | goto done; | |
2407 | ||
2408 | switch (pi->mode) { | |
2409 | case L2CAP_MODE_STREAMING: | |
2410 | case L2CAP_MODE_ERTM: | |
2411 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; | |
22121fc9 GP |
2412 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
2413 | l2cap_send_disconn_req(pi->conn, sk); | |
f2fcfcd6 GP |
2414 | break; |
2415 | default: | |
2416 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2417 | break; | |
2418 | } | |
2419 | ||
2420 | done: | |
65c7c491 MH |
2421 | switch (pi->mode) { |
2422 | case L2CAP_MODE_BASIC: | |
2423 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
2424 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
2425 | break; | |
2426 | ||
2427 | case L2CAP_MODE_ERTM: | |
2428 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 2429 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 2430 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
2431 | rfc.retrans_timeout = 0; |
2432 | rfc.monitor_timeout = 0; | |
c74e560c | 2433 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2434 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2435 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 GP |
2436 | |
2437 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2438 | sizeof(rfc), (unsigned long) &rfc); | |
fcc203c3 GP |
2439 | |
2440 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) | |
2441 | break; | |
2442 | ||
2443 | if (pi->fcs == L2CAP_FCS_NONE || | |
2444 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2445 | pi->fcs = L2CAP_FCS_NONE; | |
2446 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2447 | } | |
f2fcfcd6 GP |
2448 | break; |
2449 | ||
2450 | case L2CAP_MODE_STREAMING: | |
2451 | rfc.mode = L2CAP_MODE_STREAMING; | |
2452 | rfc.txwin_size = 0; | |
2453 | rfc.max_transmit = 0; | |
2454 | rfc.retrans_timeout = 0; | |
2455 | rfc.monitor_timeout = 0; | |
c74e560c | 2456 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2457 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2458 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 MH |
2459 | |
2460 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2461 | sizeof(rfc), (unsigned long) &rfc); | |
fcc203c3 GP |
2462 | |
2463 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) | |
2464 | break; | |
2465 | ||
2466 | if (pi->fcs == L2CAP_FCS_NONE || | |
2467 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2468 | pi->fcs = L2CAP_FCS_NONE; | |
2469 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2470 | } | |
65c7c491 MH |
2471 | break; |
2472 | } | |
1da177e4 LT |
2473 | |
2474 | /* FIXME: Need actual value of the flush timeout */ | |
2475 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
2476 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
2477 | ||
aca3192c YH |
2478 | req->dcid = cpu_to_le16(pi->dcid); |
2479 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
2480 | |
2481 | return ptr - data; | |
2482 | } | |
2483 | ||
5dee9e7c | 2484 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
2485 | { |
2486 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
2487 | struct l2cap_conf_rsp *rsp = data; |
2488 | void *ptr = rsp->data; | |
2489 | void *req = pi->conf_req; | |
2490 | int len = pi->conf_len; | |
2491 | int type, hint, olen; | |
2492 | unsigned long val; | |
6464f35f | 2493 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2494 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2495 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2496 | |
5dee9e7c | 2497 | BT_DBG("sk %p", sk); |
820ae1b8 | 2498 | |
5dee9e7c MH |
2499 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2500 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2501 | |
589d2746 | 2502 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2503 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2504 | |
2505 | switch (type) { | |
2506 | case L2CAP_CONF_MTU: | |
861d6882 | 2507 | mtu = val; |
5dee9e7c MH |
2508 | break; |
2509 | ||
2510 | case L2CAP_CONF_FLUSH_TO: | |
2511 | pi->flush_to = val; | |
2512 | break; | |
2513 | ||
2514 | case L2CAP_CONF_QOS: | |
2515 | break; | |
2516 | ||
6464f35f MH |
2517 | case L2CAP_CONF_RFC: |
2518 | if (olen == sizeof(rfc)) | |
2519 | memcpy(&rfc, (void *) val, olen); | |
2520 | break; | |
2521 | ||
fcc203c3 GP |
2522 | case L2CAP_CONF_FCS: |
2523 | if (val == L2CAP_FCS_NONE) | |
2524 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
2525 | ||
2526 | break; | |
2527 | ||
5dee9e7c MH |
2528 | default: |
2529 | if (hint) | |
2530 | break; | |
2531 | ||
2532 | result = L2CAP_CONF_UNKNOWN; | |
2533 | *((u8 *) ptr++) = type; | |
2534 | break; | |
2535 | } | |
2536 | } | |
2537 | ||
f2fcfcd6 GP |
2538 | if (pi->num_conf_rsp || pi->num_conf_req) |
2539 | goto done; | |
2540 | ||
2541 | switch (pi->mode) { | |
2542 | case L2CAP_MODE_STREAMING: | |
2543 | case L2CAP_MODE_ERTM: | |
2544 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; | |
2545 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) | |
2546 | return -ECONNREFUSED; | |
2547 | break; | |
2548 | default: | |
2549 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2550 | break; | |
2551 | } | |
2552 | ||
2553 | done: | |
2554 | if (pi->mode != rfc.mode) { | |
2555 | result = L2CAP_CONF_UNACCEPT; | |
2556 | rfc.mode = pi->mode; | |
2557 | ||
2558 | if (pi->num_conf_rsp == 1) | |
2559 | return -ECONNREFUSED; | |
2560 | ||
2561 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2562 | sizeof(rfc), (unsigned long) &rfc); | |
2563 | } | |
2564 | ||
2565 | ||
5dee9e7c MH |
2566 | if (result == L2CAP_CONF_SUCCESS) { |
2567 | /* Configure output options and let the other side know | |
2568 | * which ones we don't like. */ | |
2569 | ||
f2fcfcd6 GP |
2570 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2571 | result = L2CAP_CONF_UNACCEPT; | |
2572 | else { | |
2573 | pi->omtu = mtu; | |
2574 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
2575 | } | |
2576 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 2577 | |
f2fcfcd6 GP |
2578 | switch (rfc.mode) { |
2579 | case L2CAP_MODE_BASIC: | |
2580 | pi->fcs = L2CAP_FCS_NONE; | |
2581 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
2582 | break; | |
2583 | ||
2584 | case L2CAP_MODE_ERTM: | |
2585 | pi->remote_tx_win = rfc.txwin_size; | |
2586 | pi->remote_max_tx = rfc.max_transmit; | |
1c762159 GP |
2587 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2588 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2589 | ||
2590 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 2591 | |
10467e9e GP |
2592 | rfc.retrans_timeout = |
2593 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2594 | rfc.monitor_timeout = | |
2595 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
2596 | |
2597 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2598 | |
2599 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2600 | sizeof(rfc), (unsigned long) &rfc); | |
2601 | ||
f2fcfcd6 GP |
2602 | break; |
2603 | ||
2604 | case L2CAP_MODE_STREAMING: | |
1c762159 GP |
2605 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2606 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2607 | ||
2608 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2609 | |
2610 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2611 | |
2612 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2613 | sizeof(rfc), (unsigned long) &rfc); | |
2614 | ||
f2fcfcd6 GP |
2615 | break; |
2616 | ||
2617 | default: | |
5dee9e7c | 2618 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2619 | |
6464f35f | 2620 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
2621 | rfc.mode = pi->mode; |
2622 | } | |
6464f35f | 2623 | |
f2fcfcd6 GP |
2624 | if (result == L2CAP_CONF_SUCCESS) |
2625 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
2626 | } | |
5dee9e7c MH |
2627 | rsp->scid = cpu_to_le16(pi->dcid); |
2628 | rsp->result = cpu_to_le16(result); | |
2629 | rsp->flags = cpu_to_le16(0x0000); | |
2630 | ||
2631 | return ptr - data; | |
1da177e4 LT |
2632 | } |
2633 | ||
f2fcfcd6 GP |
2634 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2635 | { | |
2636 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2637 | struct l2cap_conf_req *req = data; | |
2638 | void *ptr = req->data; | |
2639 | int type, olen; | |
2640 | unsigned long val; | |
2641 | struct l2cap_conf_rfc rfc; | |
2642 | ||
2643 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
2644 | ||
2645 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2646 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2647 | ||
2648 | switch (type) { | |
2649 | case L2CAP_CONF_MTU: | |
2650 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2651 | *result = L2CAP_CONF_UNACCEPT; | |
2652 | pi->omtu = L2CAP_DEFAULT_MIN_MTU; | |
2653 | } else | |
2654 | pi->omtu = val; | |
2655 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
2656 | break; | |
2657 | ||
2658 | case L2CAP_CONF_FLUSH_TO: | |
2659 | pi->flush_to = val; | |
2660 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
2661 | 2, pi->flush_to); | |
2662 | break; | |
2663 | ||
2664 | case L2CAP_CONF_RFC: | |
2665 | if (olen == sizeof(rfc)) | |
2666 | memcpy(&rfc, (void *)val, olen); | |
2667 | ||
2668 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
2669 | rfc.mode != pi->mode) | |
2670 | return -ECONNREFUSED; | |
2671 | ||
2672 | pi->mode = rfc.mode; | |
2673 | pi->fcs = 0; | |
2674 | ||
2675 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2676 | sizeof(rfc), (unsigned long) &rfc); | |
2677 | break; | |
2678 | } | |
2679 | } | |
2680 | ||
2681 | if (*result == L2CAP_CONF_SUCCESS) { | |
2682 | switch (rfc.mode) { | |
2683 | case L2CAP_MODE_ERTM: | |
2684 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2685 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2686 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 2687 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2688 | break; |
2689 | case L2CAP_MODE_STREAMING: | |
1c762159 | 2690 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2691 | } |
2692 | } | |
2693 | ||
2694 | req->dcid = cpu_to_le16(pi->dcid); | |
2695 | req->flags = cpu_to_le16(0x0000); | |
2696 | ||
2697 | return ptr - data; | |
2698 | } | |
2699 | ||
5dee9e7c | 2700 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
2701 | { |
2702 | struct l2cap_conf_rsp *rsp = data; | |
2703 | void *ptr = rsp->data; | |
1da177e4 | 2704 | |
5dee9e7c | 2705 | BT_DBG("sk %p", sk); |
1da177e4 | 2706 | |
aca3192c | 2707 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 2708 | rsp->result = cpu_to_le16(result); |
aca3192c | 2709 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2710 | |
2711 | return ptr - data; | |
2712 | } | |
2713 | ||
7b1c0049 GP |
2714 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
2715 | { | |
2716 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2717 | int type, olen; | |
2718 | unsigned long val; | |
2719 | struct l2cap_conf_rfc rfc; | |
2720 | ||
2721 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
2722 | ||
2723 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
2724 | return; | |
2725 | ||
2726 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2727 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2728 | ||
2729 | switch (type) { | |
2730 | case L2CAP_CONF_RFC: | |
2731 | if (olen == sizeof(rfc)) | |
2732 | memcpy(&rfc, (void *)val, olen); | |
2733 | goto done; | |
2734 | } | |
2735 | } | |
2736 | ||
2737 | done: | |
2738 | switch (rfc.mode) { | |
2739 | case L2CAP_MODE_ERTM: | |
2740 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2741 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2742 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2743 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2744 | break; | |
2745 | case L2CAP_MODE_STREAMING: | |
2746 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2747 | } | |
2748 | } | |
2749 | ||
4e8402a3 MH |
2750 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2751 | { | |
2752 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2753 | ||
2754 | if (rej->reason != 0x0000) | |
2755 | return 0; | |
2756 | ||
2757 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2758 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2759 | del_timer(&conn->info_timer); |
984947dc MH |
2760 | |
2761 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2762 | conn->info_ident = 0; |
984947dc | 2763 | |
4e8402a3 MH |
2764 | l2cap_conn_start(conn); |
2765 | } | |
2766 | ||
2767 | return 0; | |
2768 | } | |
2769 | ||
1da177e4 LT |
2770 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2771 | { | |
2772 | struct l2cap_chan_list *list = &conn->chan_list; | |
2773 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
2774 | struct l2cap_conn_rsp rsp; | |
2775 | struct sock *sk, *parent; | |
e7c29cb1 | 2776 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2777 | |
2778 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2779 | __le16 psm = req->psm; |
1da177e4 LT |
2780 | |
2781 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2782 | ||
2783 | /* Check if we have socket listening on psm */ | |
2784 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2785 | if (!parent) { | |
2786 | result = L2CAP_CR_BAD_PSM; | |
2787 | goto sendresp; | |
2788 | } | |
2789 | ||
e7c29cb1 MH |
2790 | /* Check if the ACL is secure enough (if not SDP) */ |
2791 | if (psm != cpu_to_le16(0x0001) && | |
2792 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2793 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2794 | result = L2CAP_CR_SEC_BLOCK; |
2795 | goto response; | |
2796 | } | |
2797 | ||
1da177e4 LT |
2798 | result = L2CAP_CR_NO_MEM; |
2799 | ||
2800 | /* Check for backlog size */ | |
2801 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2802 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2803 | goto response; |
2804 | } | |
2805 | ||
3b1e0a65 | 2806 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2807 | if (!sk) |
2808 | goto response; | |
2809 | ||
fd1278d7 | 2810 | write_lock_bh(&list->lock); |
1da177e4 LT |
2811 | |
2812 | /* Check if we already have channel with that dcid */ | |
2813 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2814 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2815 | sock_set_flag(sk, SOCK_ZAPPED); |
2816 | l2cap_sock_kill(sk); | |
2817 | goto response; | |
2818 | } | |
2819 | ||
2820 | hci_conn_hold(conn->hcon); | |
2821 | ||
2822 | l2cap_sock_init(sk, parent); | |
2823 | bacpy(&bt_sk(sk)->src, conn->src); | |
2824 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2825 | l2cap_pi(sk)->psm = psm; | |
2826 | l2cap_pi(sk)->dcid = scid; | |
2827 | ||
2828 | __l2cap_chan_add(conn, sk, parent); | |
2829 | dcid = l2cap_pi(sk)->scid; | |
2830 | ||
2831 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2832 | ||
1da177e4 LT |
2833 | l2cap_pi(sk)->ident = cmd->ident; |
2834 | ||
984947dc | 2835 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2836 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2837 | if (bt_sk(sk)->defer_setup) { |
2838 | sk->sk_state = BT_CONNECT2; | |
2839 | result = L2CAP_CR_PEND; | |
2840 | status = L2CAP_CS_AUTHOR_PEND; | |
2841 | parent->sk_data_ready(parent, 0); | |
2842 | } else { | |
2843 | sk->sk_state = BT_CONFIG; | |
2844 | result = L2CAP_CR_SUCCESS; | |
2845 | status = L2CAP_CS_NO_INFO; | |
2846 | } | |
79d554a6 MH |
2847 | } else { |
2848 | sk->sk_state = BT_CONNECT2; | |
2849 | result = L2CAP_CR_PEND; | |
2850 | status = L2CAP_CS_AUTHEN_PEND; | |
2851 | } | |
2852 | } else { | |
2853 | sk->sk_state = BT_CONNECT2; | |
2854 | result = L2CAP_CR_PEND; | |
2855 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2856 | } |
2857 | ||
fd1278d7 | 2858 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2859 | |
2860 | response: | |
2861 | bh_unlock_sock(parent); | |
2862 | ||
2863 | sendresp: | |
aca3192c YH |
2864 | rsp.scid = cpu_to_le16(scid); |
2865 | rsp.dcid = cpu_to_le16(dcid); | |
2866 | rsp.result = cpu_to_le16(result); | |
2867 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2868 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2869 | |
2870 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2871 | struct l2cap_info_req info; | |
2872 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2873 | ||
2874 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2875 | conn->info_ident = l2cap_get_ident(conn); | |
2876 | ||
2877 | mod_timer(&conn->info_timer, jiffies + | |
2878 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2879 | ||
2880 | l2cap_send_cmd(conn, conn->info_ident, | |
2881 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2882 | } | |
2883 | ||
1da177e4 LT |
2884 | return 0; |
2885 | } | |
2886 | ||
2887 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2888 | { | |
2889 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2890 | u16 scid, dcid, result, status; | |
2891 | struct sock *sk; | |
2892 | u8 req[128]; | |
2893 | ||
2894 | scid = __le16_to_cpu(rsp->scid); | |
2895 | dcid = __le16_to_cpu(rsp->dcid); | |
2896 | result = __le16_to_cpu(rsp->result); | |
2897 | status = __le16_to_cpu(rsp->status); | |
2898 | ||
2899 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2900 | ||
2901 | if (scid) { | |
af05b30b GP |
2902 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2903 | if (!sk) | |
1da177e4 LT |
2904 | return 0; |
2905 | } else { | |
af05b30b GP |
2906 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2907 | if (!sk) | |
1da177e4 LT |
2908 | return 0; |
2909 | } | |
2910 | ||
2911 | switch (result) { | |
2912 | case L2CAP_CR_SUCCESS: | |
2913 | sk->sk_state = BT_CONFIG; | |
2914 | l2cap_pi(sk)->ident = 0; | |
2915 | l2cap_pi(sk)->dcid = dcid; | |
2916 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2917 | ||
6a8d3010 MH |
2918 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2919 | ||
1da177e4 LT |
2920 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2921 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 2922 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2923 | break; |
2924 | ||
2925 | case L2CAP_CR_PEND: | |
6a8d3010 | 2926 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2927 | break; |
2928 | ||
2929 | default: | |
2930 | l2cap_chan_del(sk, ECONNREFUSED); | |
2931 | break; | |
2932 | } | |
2933 | ||
2934 | bh_unlock_sock(sk); | |
2935 | return 0; | |
2936 | } | |
2937 | ||
88219a0f | 2938 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2939 | { |
2940 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2941 | u16 dcid, flags; | |
2942 | u8 rsp[64]; | |
2943 | struct sock *sk; | |
5dee9e7c | 2944 | int len; |
1da177e4 LT |
2945 | |
2946 | dcid = __le16_to_cpu(req->dcid); | |
2947 | flags = __le16_to_cpu(req->flags); | |
2948 | ||
2949 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2950 | ||
af05b30b GP |
2951 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2952 | if (!sk) | |
1da177e4 LT |
2953 | return -ENOENT; |
2954 | ||
354f60a9 MH |
2955 | if (sk->sk_state == BT_DISCONN) |
2956 | goto unlock; | |
2957 | ||
5dee9e7c | 2958 | /* Reject if config buffer is too small. */ |
88219a0f | 2959 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2960 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2961 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2962 | l2cap_build_conf_rsp(sk, rsp, | |
2963 | L2CAP_CONF_REJECT, flags), rsp); | |
2964 | goto unlock; | |
2965 | } | |
2966 | ||
2967 | /* Store config. */ | |
2968 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2969 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2970 | |
2971 | if (flags & 0x0001) { | |
2972 | /* Incomplete config. Send empty response. */ | |
2973 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2974 | l2cap_build_conf_rsp(sk, rsp, |
2975 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2976 | goto unlock; |
2977 | } | |
2978 | ||
2979 | /* Complete config. */ | |
5dee9e7c | 2980 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 2981 | if (len < 0) { |
22121fc9 | 2982 | l2cap_send_disconn_req(conn, sk); |
1da177e4 | 2983 | goto unlock; |
f2fcfcd6 | 2984 | } |
1da177e4 | 2985 | |
5dee9e7c | 2986 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 2987 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 2988 | |
5dee9e7c MH |
2989 | /* Reset config buffer. */ |
2990 | l2cap_pi(sk)->conf_len = 0; | |
2991 | ||
876d9484 MH |
2992 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2993 | goto unlock; | |
2994 | ||
1da177e4 | 2995 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
f64f9e71 JP |
2996 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
2997 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
2998 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
2999 | ||
1da177e4 | 3000 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 3001 | |
0565c1c2 GP |
3002 | l2cap_pi(sk)->next_tx_seq = 0; |
3003 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 3004 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3005 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3006 | l2cap_ertm_init(sk); | |
3007 | ||
1da177e4 | 3008 | l2cap_chan_ready(sk); |
876d9484 MH |
3009 | goto unlock; |
3010 | } | |
3011 | ||
3012 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 3013 | u8 buf[64]; |
1da177e4 | 3014 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 3015 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 3016 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
3017 | } |
3018 | ||
3019 | unlock: | |
3020 | bh_unlock_sock(sk); | |
3021 | return 0; | |
3022 | } | |
3023 | ||
3024 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3025 | { | |
3026 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
3027 | u16 scid, flags, result; | |
3028 | struct sock *sk; | |
7b1c0049 | 3029 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
3030 | |
3031 | scid = __le16_to_cpu(rsp->scid); | |
3032 | flags = __le16_to_cpu(rsp->flags); | |
3033 | result = __le16_to_cpu(rsp->result); | |
3034 | ||
af05b30b GP |
3035 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
3036 | scid, flags, result); | |
1da177e4 | 3037 | |
af05b30b GP |
3038 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3039 | if (!sk) | |
1da177e4 LT |
3040 | return 0; |
3041 | ||
3042 | switch (result) { | |
3043 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 3044 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
3045 | break; |
3046 | ||
3047 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 3048 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
3049 | char req[64]; |
3050 | ||
c2c77ec8 AE |
3051 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
3052 | l2cap_send_disconn_req(conn, sk); | |
3053 | goto done; | |
3054 | } | |
3055 | ||
f2fcfcd6 GP |
3056 | /* throw out any old stored conf requests */ |
3057 | result = L2CAP_CONF_SUCCESS; | |
3058 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
3059 | len, req, &result); | |
3060 | if (len < 0) { | |
22121fc9 | 3061 | l2cap_send_disconn_req(conn, sk); |
f2fcfcd6 GP |
3062 | goto done; |
3063 | } | |
3064 | ||
3065 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3066 | L2CAP_CONF_REQ, len, req); | |
3067 | l2cap_pi(sk)->num_conf_req++; | |
3068 | if (result != L2CAP_CONF_SUCCESS) | |
3069 | goto done; | |
3070 | break; | |
1da177e4 LT |
3071 | } |
3072 | ||
8e87d142 | 3073 | default: |
1da177e4 | 3074 | sk->sk_state = BT_DISCONN; |
b1235d79 | 3075 | sk->sk_err = ECONNRESET; |
1da177e4 | 3076 | l2cap_sock_set_timer(sk, HZ * 5); |
22121fc9 | 3077 | l2cap_send_disconn_req(conn, sk); |
1da177e4 LT |
3078 | goto done; |
3079 | } | |
3080 | ||
3081 | if (flags & 0x01) | |
3082 | goto done; | |
3083 | ||
1da177e4 LT |
3084 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
3085 | ||
3086 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
f64f9e71 JP |
3087 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
3088 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
3089 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
3090 | ||
1da177e4 | 3091 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 3092 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 3093 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 3094 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3095 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3096 | l2cap_ertm_init(sk); | |
3097 | ||
1da177e4 LT |
3098 | l2cap_chan_ready(sk); |
3099 | } | |
3100 | ||
3101 | done: | |
3102 | bh_unlock_sock(sk); | |
3103 | return 0; | |
3104 | } | |
3105 | ||
3106 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3107 | { | |
3108 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3109 | struct l2cap_disconn_rsp rsp; | |
3110 | u16 dcid, scid; | |
3111 | struct sock *sk; | |
3112 | ||
3113 | scid = __le16_to_cpu(req->scid); | |
3114 | dcid = __le16_to_cpu(req->dcid); | |
3115 | ||
3116 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3117 | ||
af05b30b GP |
3118 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3119 | if (!sk) | |
1da177e4 LT |
3120 | return 0; |
3121 | ||
aca3192c YH |
3122 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3123 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
3124 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3125 | ||
3126 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3127 | ||
1c2acffb | 3128 | skb_queue_purge(TX_QUEUE(sk)); |
0565c1c2 GP |
3129 | |
3130 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
3131 | skb_queue_purge(SREJ_QUEUE(sk)); | |
1890d36b | 3132 | skb_queue_purge(BUSY_QUEUE(sk)); |
0565c1c2 GP |
3133 | del_timer(&l2cap_pi(sk)->retrans_timer); |
3134 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
c1b4f43b | 3135 | del_timer(&l2cap_pi(sk)->ack_timer); |
0565c1c2 | 3136 | } |
1c2acffb | 3137 | |
1da177e4 LT |
3138 | l2cap_chan_del(sk, ECONNRESET); |
3139 | bh_unlock_sock(sk); | |
3140 | ||
3141 | l2cap_sock_kill(sk); | |
3142 | return 0; | |
3143 | } | |
3144 | ||
3145 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3146 | { | |
3147 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3148 | u16 dcid, scid; | |
3149 | struct sock *sk; | |
3150 | ||
3151 | scid = __le16_to_cpu(rsp->scid); | |
3152 | dcid = __le16_to_cpu(rsp->dcid); | |
3153 | ||
3154 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3155 | ||
af05b30b GP |
3156 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3157 | if (!sk) | |
1da177e4 LT |
3158 | return 0; |
3159 | ||
1c2acffb | 3160 | skb_queue_purge(TX_QUEUE(sk)); |
0565c1c2 GP |
3161 | |
3162 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
3163 | skb_queue_purge(SREJ_QUEUE(sk)); | |
1890d36b | 3164 | skb_queue_purge(BUSY_QUEUE(sk)); |
0565c1c2 GP |
3165 | del_timer(&l2cap_pi(sk)->retrans_timer); |
3166 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
c1b4f43b | 3167 | del_timer(&l2cap_pi(sk)->ack_timer); |
0565c1c2 | 3168 | } |
1c2acffb | 3169 | |
1da177e4 LT |
3170 | l2cap_chan_del(sk, 0); |
3171 | bh_unlock_sock(sk); | |
3172 | ||
3173 | l2cap_sock_kill(sk); | |
3174 | return 0; | |
3175 | } | |
3176 | ||
3177 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3178 | { | |
3179 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3180 | u16 type; |
3181 | ||
3182 | type = __le16_to_cpu(req->type); | |
3183 | ||
3184 | BT_DBG("type 0x%4.4x", type); | |
3185 | ||
f0709e03 MH |
3186 | if (type == L2CAP_IT_FEAT_MASK) { |
3187 | u8 buf[8]; | |
44dd46de | 3188 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3189 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3190 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3191 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
44dd46de | 3192 | if (enable_ertm) |
fcc203c3 GP |
3193 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3194 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 3195 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3196 | l2cap_send_cmd(conn, cmd->ident, |
3197 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3198 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3199 | u8 buf[12]; | |
3200 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
3201 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3202 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
3203 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
3204 | l2cap_send_cmd(conn, cmd->ident, | |
3205 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3206 | } else { |
3207 | struct l2cap_info_rsp rsp; | |
3208 | rsp.type = cpu_to_le16(type); | |
3209 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3210 | l2cap_send_cmd(conn, cmd->ident, | |
3211 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3212 | } | |
1da177e4 LT |
3213 | |
3214 | return 0; | |
3215 | } | |
3216 | ||
3217 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3218 | { | |
3219 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3220 | u16 type, result; | |
3221 | ||
3222 | type = __le16_to_cpu(rsp->type); | |
3223 | result = __le16_to_cpu(rsp->result); | |
3224 | ||
3225 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3226 | ||
4e8402a3 MH |
3227 | del_timer(&conn->info_timer); |
3228 | ||
984947dc | 3229 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3230 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3231 | |
47ec1dcd | 3232 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3233 | struct l2cap_info_req req; |
3234 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3235 | ||
3236 | conn->info_ident = l2cap_get_ident(conn); | |
3237 | ||
3238 | l2cap_send_cmd(conn, conn->info_ident, | |
3239 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3240 | } else { | |
3241 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3242 | conn->info_ident = 0; | |
3243 | ||
3244 | l2cap_conn_start(conn); | |
3245 | } | |
3246 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3247 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3248 | conn->info_ident = 0; |
984947dc MH |
3249 | |
3250 | l2cap_conn_start(conn); | |
3251 | } | |
4e8402a3 | 3252 | |
1da177e4 LT |
3253 | return 0; |
3254 | } | |
3255 | ||
3256 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
3257 | { | |
3258 | u8 *data = skb->data; | |
3259 | int len = skb->len; | |
3260 | struct l2cap_cmd_hdr cmd; | |
3261 | int err = 0; | |
3262 | ||
3263 | l2cap_raw_recv(conn, skb); | |
3264 | ||
3265 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3266 | u16 cmd_len; |
1da177e4 LT |
3267 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3268 | data += L2CAP_CMD_HDR_SIZE; | |
3269 | len -= L2CAP_CMD_HDR_SIZE; | |
3270 | ||
88219a0f | 3271 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3272 | |
88219a0f | 3273 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3274 | |
88219a0f | 3275 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3276 | BT_DBG("corrupted command"); |
3277 | break; | |
3278 | } | |
3279 | ||
3280 | switch (cmd.code) { | |
3281 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 3282 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
3283 | break; |
3284 | ||
3285 | case L2CAP_CONN_REQ: | |
3286 | err = l2cap_connect_req(conn, &cmd, data); | |
3287 | break; | |
3288 | ||
3289 | case L2CAP_CONN_RSP: | |
3290 | err = l2cap_connect_rsp(conn, &cmd, data); | |
3291 | break; | |
3292 | ||
3293 | case L2CAP_CONF_REQ: | |
88219a0f | 3294 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
3295 | break; |
3296 | ||
3297 | case L2CAP_CONF_RSP: | |
3298 | err = l2cap_config_rsp(conn, &cmd, data); | |
3299 | break; | |
3300 | ||
3301 | case L2CAP_DISCONN_REQ: | |
3302 | err = l2cap_disconnect_req(conn, &cmd, data); | |
3303 | break; | |
3304 | ||
3305 | case L2CAP_DISCONN_RSP: | |
3306 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
3307 | break; | |
3308 | ||
3309 | case L2CAP_ECHO_REQ: | |
88219a0f | 3310 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
3311 | break; |
3312 | ||
3313 | case L2CAP_ECHO_RSP: | |
3314 | break; | |
3315 | ||
3316 | case L2CAP_INFO_REQ: | |
3317 | err = l2cap_information_req(conn, &cmd, data); | |
3318 | break; | |
3319 | ||
3320 | case L2CAP_INFO_RSP: | |
3321 | err = l2cap_information_rsp(conn, &cmd, data); | |
3322 | break; | |
3323 | ||
3324 | default: | |
3325 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
3326 | err = -EINVAL; | |
3327 | break; | |
3328 | } | |
3329 | ||
3330 | if (err) { | |
3331 | struct l2cap_cmd_rej rej; | |
3332 | BT_DBG("error %d", err); | |
3333 | ||
3334 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3335 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3336 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3337 | } | |
3338 | ||
88219a0f AV |
3339 | data += cmd_len; |
3340 | len -= cmd_len; | |
1da177e4 LT |
3341 | } |
3342 | ||
3343 | kfree_skb(skb); | |
3344 | } | |
3345 | ||
fcc203c3 GP |
3346 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3347 | { | |
3348 | u16 our_fcs, rcv_fcs; | |
3349 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3350 | ||
3351 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
3352 | skb_trim(skb, skb->len - 2); | |
3353 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3354 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3355 | ||
3356 | if (our_fcs != rcv_fcs) | |
3357 | return -EINVAL; | |
3358 | } | |
3359 | return 0; | |
3360 | } | |
3361 | ||
d5392c8f GP |
3362 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
3363 | { | |
3364 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3365 | u16 control = 0; | |
3366 | ||
3367 | pi->frames_sent = 0; | |
3368 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
3369 | ||
3370 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3371 | ||
3372 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3373 | control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL; | |
3374 | l2cap_send_sframe(pi, control); | |
1890d36b | 3375 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
3376 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
3377 | } | |
3378 | ||
3379 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0) | |
3380 | __mod_retrans_timer(); | |
3381 | ||
844c0972 GP |
3382 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3383 | ||
dfc909be | 3384 | spin_lock_bh(&pi->send_lock); |
d5392c8f | 3385 | l2cap_ertm_send(sk); |
dfc909be | 3386 | spin_unlock_bh(&pi->send_lock); |
d5392c8f GP |
3387 | |
3388 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
3389 | pi->frames_sent == 0) { | |
3390 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
3391 | l2cap_send_sframe(pi, control); |
3392 | } | |
3393 | } | |
3394 | ||
9b53350d | 3395 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3396 | { |
3397 | struct sk_buff *next_skb; | |
3398 | ||
3399 | bt_cb(skb)->tx_seq = tx_seq; | |
3400 | bt_cb(skb)->sar = sar; | |
3401 | ||
3402 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
3403 | if (!next_skb) { | |
3404 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 3405 | return 0; |
8f17154f GP |
3406 | } |
3407 | ||
3408 | do { | |
9b53350d JPRV |
3409 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3410 | return -EINVAL; | |
3411 | ||
8f17154f GP |
3412 | if (bt_cb(next_skb)->tx_seq > tx_seq) { |
3413 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); | |
9b53350d | 3414 | return 0; |
8f17154f GP |
3415 | } |
3416 | ||
3417 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
3418 | break; | |
3419 | ||
59203a21 | 3420 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
3421 | |
3422 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
3423 | |
3424 | return 0; | |
8f17154f GP |
3425 | } |
3426 | ||
18778a63 GP |
3427 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3428 | { | |
3429 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3430 | struct sk_buff *_skb; | |
1890d36b | 3431 | int err; |
18778a63 GP |
3432 | |
3433 | switch (control & L2CAP_CTRL_SAR) { | |
3434 | case L2CAP_SDU_UNSEGMENTED: | |
3435 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3436 | goto drop; | |
3437 | ||
3438 | err = sock_queue_rcv_skb(sk, skb); | |
3439 | if (!err) | |
3440 | return err; | |
3441 | ||
3442 | break; | |
3443 | ||
3444 | case L2CAP_SDU_START: | |
3445 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3446 | goto drop; | |
3447 | ||
3448 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
3449 | |
3450 | if (pi->sdu_len > pi->imtu) | |
3451 | goto disconnect; | |
3452 | ||
3453 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
3454 | if (!pi->sdu) |
3455 | return -ENOMEM; | |
3456 | ||
3457 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
3458 | * condition we have to be sure that this will be executed | |
3459 | * only once, i.e., when alloc does not fail */ | |
3460 | skb_pull(skb, 2); | |
18778a63 GP |
3461 | |
3462 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3463 | ||
3464 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3465 | pi->partial_sdu_len = skb->len; | |
3466 | break; | |
3467 | ||
3468 | case L2CAP_SDU_CONTINUE: | |
3469 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3470 | goto disconnect; | |
3471 | ||
3472 | if (!pi->sdu) | |
3473 | goto disconnect; | |
3474 | ||
18778a63 GP |
3475 | pi->partial_sdu_len += skb->len; |
3476 | if (pi->partial_sdu_len > pi->sdu_len) | |
3477 | goto drop; | |
3478 | ||
4178ba46 GP |
3479 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3480 | ||
18778a63 GP |
3481 | break; |
3482 | ||
3483 | case L2CAP_SDU_END: | |
3484 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3485 | goto disconnect; | |
3486 | ||
3487 | if (!pi->sdu) | |
3488 | goto disconnect; | |
3489 | ||
1890d36b | 3490 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 3491 | pi->partial_sdu_len += skb->len; |
18778a63 | 3492 | |
1890d36b GP |
3493 | if (pi->partial_sdu_len > pi->imtu) |
3494 | goto drop; | |
18778a63 | 3495 | |
1890d36b GP |
3496 | if (pi->partial_sdu_len != pi->sdu_len) |
3497 | goto drop; | |
4178ba46 GP |
3498 | |
3499 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 3500 | } |
18778a63 GP |
3501 | |
3502 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
3503 | if (!_skb) { |
3504 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
3505 | return -ENOMEM; | |
3506 | } | |
3507 | ||
18778a63 | 3508 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 3509 | if (err < 0) { |
18778a63 | 3510 | kfree_skb(_skb); |
1890d36b GP |
3511 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
3512 | return err; | |
3513 | } | |
3514 | ||
3515 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
3516 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
3517 | |
3518 | kfree_skb(pi->sdu); | |
3519 | break; | |
3520 | } | |
3521 | ||
3522 | kfree_skb(skb); | |
1890d36b | 3523 | return 0; |
18778a63 GP |
3524 | |
3525 | drop: | |
3526 | kfree_skb(pi->sdu); | |
3527 | pi->sdu = NULL; | |
3528 | ||
3529 | disconnect: | |
3530 | l2cap_send_disconn_req(pi->conn, sk); | |
3531 | kfree_skb(skb); | |
3532 | return 0; | |
3533 | } | |
3534 | ||
1890d36b GP |
3535 | static void l2cap_busy_work(struct work_struct *work) |
3536 | { | |
3537 | DECLARE_WAITQUEUE(wait, current); | |
3538 | struct l2cap_pinfo *pi = | |
3539 | container_of(work, struct l2cap_pinfo, busy_work); | |
3540 | struct sock *sk = (struct sock *)pi; | |
3541 | int n_tries = 0, timeo = HZ/5, err; | |
3542 | struct sk_buff *skb; | |
3543 | u16 control; | |
3544 | ||
3545 | lock_sock(sk); | |
3546 | ||
3547 | add_wait_queue(sk->sk_sleep, &wait); | |
3548 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { | |
3549 | set_current_state(TASK_INTERRUPTIBLE); | |
3550 | ||
3551 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3552 | err = -EBUSY; | |
3553 | l2cap_send_disconn_req(pi->conn, sk); | |
3554 | goto done; | |
3555 | } | |
3556 | ||
3557 | if (!timeo) | |
3558 | timeo = HZ/5; | |
3559 | ||
3560 | if (signal_pending(current)) { | |
3561 | err = sock_intr_errno(timeo); | |
3562 | goto done; | |
3563 | } | |
3564 | ||
3565 | release_sock(sk); | |
3566 | timeo = schedule_timeout(timeo); | |
3567 | lock_sock(sk); | |
3568 | ||
3569 | err = sock_error(sk); | |
3570 | if (err) | |
3571 | goto done; | |
3572 | ||
3573 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
3574 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
3575 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3576 | if (err < 0) { | |
3577 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
3578 | break; | |
3579 | } | |
3580 | ||
3581 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3582 | } | |
3583 | ||
3584 | if (!skb) | |
3585 | break; | |
3586 | } | |
3587 | ||
3588 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
3589 | goto done; | |
3590 | ||
3591 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3592 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
3593 | l2cap_send_sframe(pi, control); | |
3594 | l2cap_pi(sk)->retry_count = 1; | |
3595 | ||
3596 | del_timer(&pi->retrans_timer); | |
3597 | __mod_monitor_timer(); | |
3598 | ||
3599 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
3600 | ||
3601 | done: | |
3602 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
3603 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
3604 | ||
3605 | set_current_state(TASK_RUNNING); | |
3606 | remove_wait_queue(sk->sk_sleep, &wait); | |
3607 | ||
3608 | release_sock(sk); | |
3609 | } | |
3610 | ||
3611 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
3612 | { | |
3613 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3614 | int sctrl, err; | |
3615 | ||
3616 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3617 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3618 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3619 | return -EBUSY; | |
3620 | } | |
3621 | ||
3622 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3623 | if (err >= 0) { | |
3624 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3625 | return err; | |
3626 | } | |
3627 | ||
3628 | /* Busy Condition */ | |
3629 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; | |
3630 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3631 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3632 | ||
3633 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3634 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
3635 | l2cap_send_sframe(pi, sctrl); | |
3636 | ||
3637 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
3638 | ||
3639 | queue_work(_busy_wq, &pi->busy_work); | |
3640 | ||
3641 | return err; | |
3642 | } | |
3643 | ||
18778a63 | 3644 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3645 | { |
3646 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3647 | struct sk_buff *_skb; | |
3648 | int err = -EINVAL; | |
3649 | ||
18778a63 GP |
3650 | /* |
3651 | * TODO: We have to notify the userland if some data is lost with the | |
3652 | * Streaming Mode. | |
3653 | */ | |
3654 | ||
c74e560c GP |
3655 | switch (control & L2CAP_CTRL_SAR) { |
3656 | case L2CAP_SDU_UNSEGMENTED: | |
3657 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3658 | kfree_skb(pi->sdu); | |
3659 | break; | |
3660 | } | |
3661 | ||
3662 | err = sock_queue_rcv_skb(sk, skb); | |
3663 | if (!err) | |
3664 | return 0; | |
3665 | ||
3666 | break; | |
3667 | ||
3668 | case L2CAP_SDU_START: | |
3669 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3670 | kfree_skb(pi->sdu); | |
3671 | break; | |
3672 | } | |
3673 | ||
3674 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3675 | skb_pull(skb, 2); | |
3676 | ||
052897ca GP |
3677 | if (pi->sdu_len > pi->imtu) { |
3678 | err = -EMSGSIZE; | |
3679 | break; | |
3680 | } | |
3681 | ||
c74e560c GP |
3682 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3683 | if (!pi->sdu) { | |
3684 | err = -ENOMEM; | |
3685 | break; | |
3686 | } | |
3687 | ||
3688 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3689 | ||
3690 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3691 | pi->partial_sdu_len = skb->len; | |
3692 | err = 0; | |
3693 | break; | |
3694 | ||
3695 | case L2CAP_SDU_CONTINUE: | |
3696 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3697 | break; | |
3698 | ||
3699 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3700 | ||
3701 | pi->partial_sdu_len += skb->len; | |
3702 | if (pi->partial_sdu_len > pi->sdu_len) | |
3703 | kfree_skb(pi->sdu); | |
3704 | else | |
3705 | err = 0; | |
3706 | ||
3707 | break; | |
3708 | ||
3709 | case L2CAP_SDU_END: | |
3710 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3711 | break; | |
3712 | ||
3713 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3714 | ||
3715 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3716 | pi->partial_sdu_len += skb->len; | |
3717 | ||
36f2fd58 GP |
3718 | if (pi->partial_sdu_len > pi->imtu) |
3719 | goto drop; | |
3720 | ||
c74e560c GP |
3721 | if (pi->partial_sdu_len == pi->sdu_len) { |
3722 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3723 | err = sock_queue_rcv_skb(sk, _skb); | |
3724 | if (err < 0) | |
3725 | kfree_skb(_skb); | |
3726 | } | |
c74e560c GP |
3727 | err = 0; |
3728 | ||
36f2fd58 GP |
3729 | drop: |
3730 | kfree_skb(pi->sdu); | |
c74e560c GP |
3731 | break; |
3732 | } | |
3733 | ||
3734 | kfree_skb(skb); | |
3735 | return err; | |
3736 | } | |
3737 | ||
8f17154f GP |
3738 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3739 | { | |
3740 | struct sk_buff *skb; | |
afefdbc4 | 3741 | u16 control; |
8f17154f | 3742 | |
59203a21 | 3743 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3744 | if (bt_cb(skb)->tx_seq != tx_seq) |
3745 | break; | |
3746 | ||
3747 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3748 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3749 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3750 | l2cap_pi(sk)->buffer_seq_srej = |
3751 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
3752 | tx_seq++; | |
3753 | } | |
3754 | } | |
3755 | ||
3756 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3757 | { | |
3758 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3759 | struct srej_list *l, *tmp; | |
3760 | u16 control; | |
3761 | ||
59203a21 | 3762 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3763 | if (l->tx_seq == tx_seq) { |
3764 | list_del(&l->list); | |
3765 | kfree(l); | |
3766 | return; | |
3767 | } | |
3768 | control = L2CAP_SUPER_SELECT_REJECT; | |
3769 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3770 | l2cap_send_sframe(pi, control); | |
3771 | list_del(&l->list); | |
3772 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3773 | } | |
3774 | } | |
3775 | ||
3776 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3777 | { | |
3778 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3779 | struct srej_list *new; | |
3780 | u16 control; | |
3781 | ||
3782 | while (tx_seq != pi->expected_tx_seq) { | |
3783 | control = L2CAP_SUPER_SELECT_REJECT; | |
3784 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3785 | l2cap_send_sframe(pi, control); | |
3786 | ||
3787 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
3788 | new->tx_seq = pi->expected_tx_seq++; | |
3789 | list_add_tail(&new->list, SREJ_LIST(sk)); | |
3790 | } | |
3791 | pi->expected_tx_seq++; | |
3792 | } | |
3793 | ||
1c2acffb GP |
3794 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3795 | { | |
3796 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3797 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3798 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3799 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
9b53350d | 3800 | u8 tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3801 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3802 | int err = 0; |
3803 | ||
3804 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3805 | ||
9b16dc65 GP |
3806 | if (L2CAP_CTRL_FINAL & rx_control && |
3807 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3808 | del_timer(&pi->monitor_timer); |
3809 | if (pi->unacked_frames > 0) | |
3810 | __mod_retrans_timer(); | |
3811 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3812 | } | |
3813 | ||
9f121a5a GP |
3814 | pi->expected_ack_seq = req_seq; |
3815 | l2cap_drop_acked_frames(sk); | |
3816 | ||
8f17154f GP |
3817 | if (tx_seq == pi->expected_tx_seq) |
3818 | goto expected; | |
1c2acffb | 3819 | |
9b53350d JPRV |
3820 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3821 | if (tx_seq_offset < 0) | |
3822 | tx_seq_offset += 64; | |
3823 | ||
3824 | /* invalid tx_seq */ | |
3825 | if (tx_seq_offset >= pi->tx_win) { | |
3826 | l2cap_send_disconn_req(pi->conn, sk); | |
3827 | goto drop; | |
3828 | } | |
3829 | ||
1890d36b GP |
3830 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
3831 | goto drop; | |
3832 | ||
8f17154f GP |
3833 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3834 | struct srej_list *first; | |
30afb5b2 | 3835 | |
8f17154f GP |
3836 | first = list_first_entry(SREJ_LIST(sk), |
3837 | struct srej_list, list); | |
3838 | if (tx_seq == first->tx_seq) { | |
3839 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3840 | l2cap_check_srej_gap(sk, tx_seq); | |
3841 | ||
3842 | list_del(&first->list); | |
3843 | kfree(first); | |
3844 | ||
3845 | if (list_empty(SREJ_LIST(sk))) { | |
3846 | pi->buffer_seq = pi->buffer_seq_srej; | |
3847 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3848 | l2cap_send_ack(pi); |
8f17154f GP |
3849 | } |
3850 | } else { | |
3851 | struct srej_list *l; | |
9b53350d JPRV |
3852 | |
3853 | /* duplicated tx_seq */ | |
3854 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
3855 | goto drop; | |
8f17154f GP |
3856 | |
3857 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3858 | if (l->tx_seq == tx_seq) { | |
3859 | l2cap_resend_srejframe(sk, tx_seq); | |
3860 | return 0; | |
3861 | } | |
3862 | } | |
3863 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3864 | } |
3865 | } else { | |
9b53350d JPRV |
3866 | expected_tx_seq_offset = |
3867 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
3868 | if (expected_tx_seq_offset < 0) | |
3869 | expected_tx_seq_offset += 64; | |
3870 | ||
3871 | /* duplicated tx_seq */ | |
3872 | if (tx_seq_offset < expected_tx_seq_offset) | |
3873 | goto drop; | |
3874 | ||
8f17154f | 3875 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3876 | |
8f17154f GP |
3877 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3878 | pi->buffer_seq_srej = pi->buffer_seq; | |
3879 | ||
3880 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 3881 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
3882 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3883 | ||
ef54fd93 GP |
3884 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3885 | ||
8f17154f | 3886 | l2cap_send_srejframe(sk, tx_seq); |
1c2acffb | 3887 | } |
30afb5b2 GP |
3888 | return 0; |
3889 | ||
8f17154f GP |
3890 | expected: |
3891 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3892 | ||
3893 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3894 | bt_cb(skb)->tx_seq = tx_seq; |
3895 | bt_cb(skb)->sar = sar; | |
3896 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3897 | return 0; |
3898 | } | |
3899 | ||
4ec10d97 GP |
3900 | if (rx_control & L2CAP_CTRL_FINAL) { |
3901 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3902 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3903 | else |
3904 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
3905 | } |
3906 | ||
1890d36b | 3907 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
8f17154f | 3908 | if (err < 0) |
1890d36b | 3909 | return 0; |
8f17154f | 3910 | |
c1b4f43b GP |
3911 | __mod_ack_timer(); |
3912 | ||
803020c6 GP |
3913 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3914 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3915 | l2cap_send_ack(pi); |
3916 | ||
8f17154f | 3917 | return 0; |
9b53350d JPRV |
3918 | |
3919 | drop: | |
3920 | kfree_skb(skb); | |
3921 | return 0; | |
1c2acffb GP |
3922 | } |
3923 | ||
e072745f | 3924 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
3925 | { |
3926 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 GP |
3927 | |
3928 | pi->expected_ack_seq = __get_reqseq(rx_control); | |
3929 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 3930 | |
e072745f | 3931 | if (rx_control & L2CAP_CTRL_POLL) { |
05fbd89d GP |
3932 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3933 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
3934 | (pi->unacked_frames > 0)) | |
3935 | __mod_retrans_timer(); | |
3936 | ||
3937 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3938 | l2cap_send_srejtail(sk); | |
3939 | } else { | |
3940 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 3941 | } |
1d8f5d16 | 3942 | |
e072745f GP |
3943 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3944 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 3945 | |
e072745f GP |
3946 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3947 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3948 | else |
3949 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 3950 | |
e072745f | 3951 | } else { |
e072745f GP |
3952 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3953 | (pi->unacked_frames > 0)) | |
3954 | __mod_retrans_timer(); | |
1c2acffb | 3955 | |
2246b2f1 | 3956 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
dfc909be | 3957 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
e072745f | 3958 | l2cap_send_ack(pi); |
dfc909be GP |
3959 | } else { |
3960 | spin_lock_bh(&pi->send_lock); | |
e072745f | 3961 | l2cap_ertm_send(sk); |
dfc909be GP |
3962 | spin_unlock_bh(&pi->send_lock); |
3963 | } | |
e072745f GP |
3964 | } |
3965 | } | |
2246b2f1 | 3966 | |
e072745f GP |
3967 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
3968 | { | |
3969 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3970 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3971 | |
e072745f GP |
3972 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3973 | ||
8abb52ee | 3974 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
3975 | l2cap_drop_acked_frames(sk); |
3976 | ||
3977 | if (rx_control & L2CAP_CTRL_FINAL) { | |
3978 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3979 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3980 | else |
3981 | l2cap_retransmit_frames(sk); | |
e072745f | 3982 | } else { |
dfc909be | 3983 | l2cap_retransmit_frames(sk); |
30afb5b2 | 3984 | |
0301ef04 | 3985 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 3986 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
3987 | } |
3988 | } | |
3989 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
3990 | { | |
3991 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3992 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3993 | |
e072745f | 3994 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3995 | |
e072745f GP |
3996 | if (rx_control & L2CAP_CTRL_POLL) { |
3997 | pi->expected_ack_seq = tx_seq; | |
3998 | l2cap_drop_acked_frames(sk); | |
dfc909be GP |
3999 | l2cap_retransmit_one_frame(sk, tx_seq); |
4000 | ||
4001 | spin_lock_bh(&pi->send_lock); | |
e072745f | 4002 | l2cap_ertm_send(sk); |
dfc909be GP |
4003 | spin_unlock_bh(&pi->send_lock); |
4004 | ||
e072745f GP |
4005 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4006 | pi->srej_save_reqseq = tx_seq; | |
4007 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4008 | } |
e072745f GP |
4009 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
4010 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
4011 | pi->srej_save_reqseq == tx_seq) | |
4012 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
4013 | else | |
dfc909be | 4014 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 4015 | } else { |
dfc909be | 4016 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
4017 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
4018 | pi->srej_save_reqseq = tx_seq; | |
4019 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 4020 | } |
e072745f GP |
4021 | } |
4022 | } | |
4023 | ||
4024 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
4025 | { | |
4026 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4027 | u8 tx_seq = __get_reqseq(rx_control); | |
4028 | ||
4029 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; | |
4030 | pi->expected_ack_seq = tx_seq; | |
4031 | l2cap_drop_acked_frames(sk); | |
4032 | ||
99b0d4b7 GP |
4033 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
4034 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
4035 | if (rx_control & L2CAP_CTRL_POLL) |
4036 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 4037 | return; |
e072745f | 4038 | } |
99b0d4b7 GP |
4039 | |
4040 | if (rx_control & L2CAP_CTRL_POLL) | |
4041 | l2cap_send_srejtail(sk); | |
4042 | else | |
4043 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
4044 | } |
4045 | ||
4046 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
4047 | { | |
4048 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
4049 | ||
9b16dc65 GP |
4050 | if (L2CAP_CTRL_FINAL & rx_control && |
4051 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
4052 | del_timer(&l2cap_pi(sk)->monitor_timer); |
4053 | if (l2cap_pi(sk)->unacked_frames > 0) | |
4054 | __mod_retrans_timer(); | |
4055 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
4056 | } | |
4057 | ||
4058 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
4059 | case L2CAP_SUPER_RCV_READY: | |
4060 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
4061 | break; |
4062 | ||
e072745f GP |
4063 | case L2CAP_SUPER_REJECT: |
4064 | l2cap_data_channel_rejframe(sk, rx_control); | |
4065 | break; | |
2246b2f1 | 4066 | |
e072745f GP |
4067 | case L2CAP_SUPER_SELECT_REJECT: |
4068 | l2cap_data_channel_srejframe(sk, rx_control); | |
4069 | break; | |
4070 | ||
4071 | case L2CAP_SUPER_RCV_NOT_READY: | |
4072 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
4073 | break; |
4074 | } | |
4075 | ||
faaebd19 | 4076 | kfree_skb(skb); |
1c2acffb GP |
4077 | return 0; |
4078 | } | |
4079 | ||
1da177e4 LT |
4080 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4081 | { | |
4082 | struct sock *sk; | |
6840ed07 | 4083 | struct l2cap_pinfo *pi; |
c74e560c | 4084 | u16 control, len; |
01760bdd | 4085 | u8 tx_seq, req_seq, next_tx_seq_offset, req_seq_offset; |
1da177e4 LT |
4086 | |
4087 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
4088 | if (!sk) { | |
4089 | BT_DBG("unknown cid 0x%4.4x", cid); | |
4090 | goto drop; | |
4091 | } | |
4092 | ||
6840ed07 GP |
4093 | pi = l2cap_pi(sk); |
4094 | ||
1da177e4 LT |
4095 | BT_DBG("sk %p, len %d", sk, skb->len); |
4096 | ||
4097 | if (sk->sk_state != BT_CONNECTED) | |
4098 | goto drop; | |
4099 | ||
6840ed07 | 4100 | switch (pi->mode) { |
1c2acffb GP |
4101 | case L2CAP_MODE_BASIC: |
4102 | /* If socket recv buffers overflows we drop data here | |
4103 | * which is *bad* because L2CAP has to be reliable. | |
4104 | * But we don't have any other choice. L2CAP doesn't | |
4105 | * provide flow control mechanism. */ | |
1da177e4 | 4106 | |
6840ed07 | 4107 | if (pi->imtu < skb->len) |
1c2acffb | 4108 | goto drop; |
1da177e4 | 4109 | |
1c2acffb GP |
4110 | if (!sock_queue_rcv_skb(sk, skb)) |
4111 | goto done; | |
4112 | break; | |
4113 | ||
4114 | case L2CAP_MODE_ERTM: | |
4115 | control = get_unaligned_le16(skb->data); | |
4116 | skb_pull(skb, 2); | |
c74e560c | 4117 | len = skb->len; |
1c2acffb | 4118 | |
c74e560c GP |
4119 | if (__is_sar_start(control)) |
4120 | len -= 2; | |
4121 | ||
fcc203c3 GP |
4122 | if (pi->fcs == L2CAP_FCS_CRC16) |
4123 | len -= 2; | |
4124 | ||
30afb5b2 GP |
4125 | /* |
4126 | * We can just drop the corrupted I-frame here. | |
4127 | * Receiver will miss it and start proper recovery | |
4128 | * procedures and ask retransmission. | |
4129 | */ | |
18778a63 GP |
4130 | if (len > pi->mps) { |
4131 | l2cap_send_disconn_req(pi->conn, sk); | |
1c2acffb | 4132 | goto drop; |
18778a63 | 4133 | } |
1c2acffb | 4134 | |
fcc203c3 GP |
4135 | if (l2cap_check_fcs(pi, skb)) |
4136 | goto drop; | |
4137 | ||
01760bdd JPRV |
4138 | req_seq = __get_reqseq(control); |
4139 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
4140 | if (req_seq_offset < 0) | |
4141 | req_seq_offset += 64; | |
4142 | ||
4143 | next_tx_seq_offset = | |
4144 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
4145 | if (next_tx_seq_offset < 0) | |
4146 | next_tx_seq_offset += 64; | |
4147 | ||
4148 | /* check for invalid req-seq */ | |
4149 | if (req_seq_offset > next_tx_seq_offset) { | |
4150 | l2cap_send_disconn_req(pi->conn, sk); | |
4151 | goto drop; | |
4152 | } | |
4153 | ||
277ffbe3 | 4154 | if (__is_iframe(control)) { |
18778a63 GP |
4155 | if (len < 4) { |
4156 | l2cap_send_disconn_req(pi->conn, sk); | |
277ffbe3 | 4157 | goto drop; |
18778a63 | 4158 | } |
277ffbe3 | 4159 | |
fcafde2e | 4160 | l2cap_data_channel_iframe(sk, control, skb); |
277ffbe3 | 4161 | } else { |
18778a63 GP |
4162 | if (len != 0) { |
4163 | l2cap_send_disconn_req(pi->conn, sk); | |
277ffbe3 | 4164 | goto drop; |
18778a63 | 4165 | } |
277ffbe3 | 4166 | |
fcafde2e | 4167 | l2cap_data_channel_sframe(sk, control, skb); |
277ffbe3 | 4168 | } |
1c2acffb | 4169 | |
fcafde2e | 4170 | goto done; |
1c2acffb | 4171 | |
6840ed07 GP |
4172 | case L2CAP_MODE_STREAMING: |
4173 | control = get_unaligned_le16(skb->data); | |
4174 | skb_pull(skb, 2); | |
4175 | len = skb->len; | |
4176 | ||
4177 | if (__is_sar_start(control)) | |
4178 | len -= 2; | |
4179 | ||
fcc203c3 GP |
4180 | if (pi->fcs == L2CAP_FCS_CRC16) |
4181 | len -= 2; | |
4182 | ||
1c762159 | 4183 | if (len > pi->mps || len < 4 || __is_sframe(control)) |
6840ed07 GP |
4184 | goto drop; |
4185 | ||
fcc203c3 GP |
4186 | if (l2cap_check_fcs(pi, skb)) |
4187 | goto drop; | |
4188 | ||
6840ed07 GP |
4189 | tx_seq = __get_txseq(control); |
4190 | ||
4191 | if (pi->expected_tx_seq == tx_seq) | |
4192 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
4193 | else | |
7dffe421 | 4194 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 4195 | |
18778a63 | 4196 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
4197 | |
4198 | goto done; | |
4199 | ||
1c2acffb | 4200 | default: |
e8235c6b | 4201 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
4202 | break; |
4203 | } | |
1da177e4 LT |
4204 | |
4205 | drop: | |
4206 | kfree_skb(skb); | |
4207 | ||
4208 | done: | |
0139418c MH |
4209 | if (sk) |
4210 | bh_unlock_sock(sk); | |
4211 | ||
1da177e4 LT |
4212 | return 0; |
4213 | } | |
4214 | ||
8e036fc3 | 4215 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
4216 | { |
4217 | struct sock *sk; | |
4218 | ||
4219 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
4220 | if (!sk) | |
4221 | goto drop; | |
4222 | ||
4223 | BT_DBG("sk %p, len %d", sk, skb->len); | |
4224 | ||
4225 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
4226 | goto drop; | |
4227 | ||
4228 | if (l2cap_pi(sk)->imtu < skb->len) | |
4229 | goto drop; | |
4230 | ||
4231 | if (!sock_queue_rcv_skb(sk, skb)) | |
4232 | goto done; | |
4233 | ||
4234 | drop: | |
4235 | kfree_skb(skb); | |
4236 | ||
4237 | done: | |
af05b30b GP |
4238 | if (sk) |
4239 | bh_unlock_sock(sk); | |
1da177e4 LT |
4240 | return 0; |
4241 | } | |
4242 | ||
4243 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
4244 | { | |
4245 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4246 | u16 cid, len; |
4247 | __le16 psm; | |
1da177e4 LT |
4248 | |
4249 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4250 | cid = __le16_to_cpu(lh->cid); | |
4251 | len = __le16_to_cpu(lh->len); | |
4252 | ||
1c2acffb GP |
4253 | if (len != skb->len) { |
4254 | kfree_skb(skb); | |
4255 | return; | |
4256 | } | |
4257 | ||
1da177e4 LT |
4258 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4259 | ||
4260 | switch (cid) { | |
8db4dc46 | 4261 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4262 | l2cap_sig_channel(conn, skb); |
4263 | break; | |
4264 | ||
8db4dc46 | 4265 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4266 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4267 | skb_pull(skb, 2); |
4268 | l2cap_conless_channel(conn, psm, skb); | |
4269 | break; | |
4270 | ||
4271 | default: | |
4272 | l2cap_data_channel(conn, cid, skb); | |
4273 | break; | |
4274 | } | |
4275 | } | |
4276 | ||
4277 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4278 | ||
4279 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4280 | { | |
4281 | int exact = 0, lm1 = 0, lm2 = 0; | |
4282 | register struct sock *sk; | |
4283 | struct hlist_node *node; | |
4284 | ||
4285 | if (type != ACL_LINK) | |
4286 | return 0; | |
4287 | ||
4288 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4289 | ||
4290 | /* Find listening sockets and check their link_mode */ | |
4291 | read_lock(&l2cap_sk_list.lock); | |
4292 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
4293 | if (sk->sk_state != BT_LISTEN) | |
4294 | continue; | |
4295 | ||
4296 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
4297 | lm1 |= HCI_LM_ACCEPT; |
4298 | if (l2cap_pi(sk)->role_switch) | |
4299 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 4300 | exact++; |
2af6b9d5 MH |
4301 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4302 | lm2 |= HCI_LM_ACCEPT; | |
4303 | if (l2cap_pi(sk)->role_switch) | |
4304 | lm2 |= HCI_LM_MASTER; | |
4305 | } | |
1da177e4 LT |
4306 | } |
4307 | read_unlock(&l2cap_sk_list.lock); | |
4308 | ||
4309 | return exact ? lm1 : lm2; | |
4310 | } | |
4311 | ||
4312 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4313 | { | |
0139418c MH |
4314 | struct l2cap_conn *conn; |
4315 | ||
1da177e4 LT |
4316 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4317 | ||
4318 | if (hcon->type != ACL_LINK) | |
4319 | return 0; | |
4320 | ||
4321 | if (!status) { | |
1da177e4 LT |
4322 | conn = l2cap_conn_add(hcon, status); |
4323 | if (conn) | |
4324 | l2cap_conn_ready(conn); | |
0139418c | 4325 | } else |
1da177e4 LT |
4326 | l2cap_conn_del(hcon, bt_err(status)); |
4327 | ||
4328 | return 0; | |
4329 | } | |
4330 | ||
2950f21a MH |
4331 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4332 | { | |
4333 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4334 | ||
4335 | BT_DBG("hcon %p", hcon); | |
4336 | ||
4337 | if (hcon->type != ACL_LINK || !conn) | |
4338 | return 0x13; | |
4339 | ||
4340 | return conn->disc_reason; | |
4341 | } | |
4342 | ||
4343 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4344 | { |
4345 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4346 | ||
4347 | if (hcon->type != ACL_LINK) | |
4348 | return 0; | |
4349 | ||
4350 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4351 | |
1da177e4 LT |
4352 | return 0; |
4353 | } | |
4354 | ||
f62e4323 MH |
4355 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
4356 | { | |
bd3c9e25 | 4357 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
4358 | return; |
4359 | ||
f62e4323 MH |
4360 | if (encrypt == 0x00) { |
4361 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
4362 | l2cap_sock_clear_timer(sk); | |
4363 | l2cap_sock_set_timer(sk, HZ * 5); | |
4364 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
4365 | __l2cap_sock_close(sk, ECONNREFUSED); | |
4366 | } else { | |
4367 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
4368 | l2cap_sock_clear_timer(sk); | |
4369 | } | |
4370 | } | |
4371 | ||
8c1b2355 | 4372 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
4373 | { |
4374 | struct l2cap_chan_list *l; | |
0139418c | 4375 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 4376 | struct sock *sk; |
1da177e4 | 4377 | |
0139418c | 4378 | if (!conn) |
1da177e4 | 4379 | return 0; |
0139418c | 4380 | |
1da177e4 LT |
4381 | l = &conn->chan_list; |
4382 | ||
4383 | BT_DBG("conn %p", conn); | |
4384 | ||
4385 | read_lock(&l->lock); | |
4386 | ||
4387 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
4388 | bh_lock_sock(sk); | |
4389 | ||
6a8d3010 MH |
4390 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
4391 | bh_unlock_sock(sk); | |
4392 | continue; | |
4393 | } | |
4394 | ||
f62e4323 | 4395 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 4396 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 4397 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
4398 | bh_unlock_sock(sk); |
4399 | continue; | |
4400 | } | |
4401 | ||
b1235d79 MH |
4402 | if (sk->sk_state == BT_CONNECT) { |
4403 | if (!status) { | |
4404 | struct l2cap_conn_req req; | |
4405 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4406 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 4407 | |
b1235d79 | 4408 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
1da177e4 | 4409 | |
b1235d79 MH |
4410 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4411 | L2CAP_CONN_REQ, sizeof(req), &req); | |
4412 | } else { | |
4413 | l2cap_sock_clear_timer(sk); | |
4414 | l2cap_sock_set_timer(sk, HZ / 10); | |
4415 | } | |
4416 | } else if (sk->sk_state == BT_CONNECT2) { | |
4417 | struct l2cap_conn_rsp rsp; | |
4418 | __u16 result; | |
1da177e4 | 4419 | |
b1235d79 MH |
4420 | if (!status) { |
4421 | sk->sk_state = BT_CONFIG; | |
4422 | result = L2CAP_CR_SUCCESS; | |
4423 | } else { | |
4424 | sk->sk_state = BT_DISCONN; | |
4425 | l2cap_sock_set_timer(sk, HZ / 10); | |
4426 | result = L2CAP_CR_SEC_BLOCK; | |
4427 | } | |
4428 | ||
4429 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
4430 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4431 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 4432 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
4433 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4434 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4435 | } | |
1da177e4 LT |
4436 | |
4437 | bh_unlock_sock(sk); | |
4438 | } | |
4439 | ||
4440 | read_unlock(&l->lock); | |
b1235d79 | 4441 | |
1da177e4 LT |
4442 | return 0; |
4443 | } | |
4444 | ||
4445 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4446 | { | |
4447 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4448 | ||
4449 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
4450 | goto drop; | |
4451 | ||
4452 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4453 | ||
4454 | if (flags & ACL_START) { | |
4455 | struct l2cap_hdr *hdr; | |
4456 | int len; | |
4457 | ||
4458 | if (conn->rx_len) { | |
4459 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4460 | kfree_skb(conn->rx_skb); | |
4461 | conn->rx_skb = NULL; | |
4462 | conn->rx_len = 0; | |
4463 | l2cap_conn_unreliable(conn, ECOMM); | |
4464 | } | |
4465 | ||
4466 | if (skb->len < 2) { | |
4467 | BT_ERR("Frame is too short (len %d)", skb->len); | |
4468 | l2cap_conn_unreliable(conn, ECOMM); | |
4469 | goto drop; | |
4470 | } | |
4471 | ||
4472 | hdr = (struct l2cap_hdr *) skb->data; | |
4473 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
4474 | ||
4475 | if (len == skb->len) { | |
4476 | /* Complete frame received */ | |
4477 | l2cap_recv_frame(conn, skb); | |
4478 | return 0; | |
4479 | } | |
4480 | ||
4481 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4482 | ||
4483 | if (skb->len > len) { | |
4484 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4485 | skb->len, len); | |
4486 | l2cap_conn_unreliable(conn, ECOMM); | |
4487 | goto drop; | |
4488 | } | |
4489 | ||
4490 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
4491 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4492 | if (!conn->rx_skb) | |
1da177e4 LT |
4493 | goto drop; |
4494 | ||
d626f62b | 4495 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4496 | skb->len); |
1da177e4 LT |
4497 | conn->rx_len = len - skb->len; |
4498 | } else { | |
4499 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4500 | ||
4501 | if (!conn->rx_len) { | |
4502 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4503 | l2cap_conn_unreliable(conn, ECOMM); | |
4504 | goto drop; | |
4505 | } | |
4506 | ||
4507 | if (skb->len > conn->rx_len) { | |
4508 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4509 | skb->len, conn->rx_len); | |
4510 | kfree_skb(conn->rx_skb); | |
4511 | conn->rx_skb = NULL; | |
4512 | conn->rx_len = 0; | |
4513 | l2cap_conn_unreliable(conn, ECOMM); | |
4514 | goto drop; | |
4515 | } | |
4516 | ||
d626f62b | 4517 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4518 | skb->len); |
1da177e4 LT |
4519 | conn->rx_len -= skb->len; |
4520 | ||
4521 | if (!conn->rx_len) { | |
4522 | /* Complete frame received */ | |
4523 | l2cap_recv_frame(conn, conn->rx_skb); | |
4524 | conn->rx_skb = NULL; | |
4525 | } | |
4526 | } | |
4527 | ||
4528 | drop: | |
4529 | kfree_skb(skb); | |
4530 | return 0; | |
4531 | } | |
4532 | ||
aef7d97c | 4533 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4534 | { |
4535 | struct sock *sk; | |
4536 | struct hlist_node *node; | |
1da177e4 LT |
4537 | |
4538 | read_lock_bh(&l2cap_sk_list.lock); | |
4539 | ||
be9d1227 MH |
4540 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4541 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4542 | |
aef7d97c MH |
4543 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
4544 | batostr(&bt_sk(sk)->src), | |
4545 | batostr(&bt_sk(sk)->dst), | |
4546 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4547 | pi->scid, pi->dcid, | |
4548 | pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 4549 | } |
1da177e4 | 4550 | |
1da177e4 | 4551 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4552 | |
aef7d97c | 4553 | return 0; |
1da177e4 LT |
4554 | } |
4555 | ||
aef7d97c MH |
4556 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4557 | { | |
4558 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4559 | } | |
4560 | ||
4561 | static const struct file_operations l2cap_debugfs_fops = { | |
4562 | .open = l2cap_debugfs_open, | |
4563 | .read = seq_read, | |
4564 | .llseek = seq_lseek, | |
4565 | .release = single_release, | |
4566 | }; | |
4567 | ||
4568 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4569 | |
90ddc4f0 | 4570 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
4571 | .family = PF_BLUETOOTH, |
4572 | .owner = THIS_MODULE, | |
4573 | .release = l2cap_sock_release, | |
4574 | .bind = l2cap_sock_bind, | |
4575 | .connect = l2cap_sock_connect, | |
4576 | .listen = l2cap_sock_listen, | |
4577 | .accept = l2cap_sock_accept, | |
4578 | .getname = l2cap_sock_getname, | |
4579 | .sendmsg = l2cap_sock_sendmsg, | |
f66dc81f | 4580 | .recvmsg = l2cap_sock_recvmsg, |
1da177e4 | 4581 | .poll = bt_sock_poll, |
3241ad82 | 4582 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
4583 | .mmap = sock_no_mmap, |
4584 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
4585 | .shutdown = l2cap_sock_shutdown, |
4586 | .setsockopt = l2cap_sock_setsockopt, | |
4587 | .getsockopt = l2cap_sock_getsockopt | |
4588 | }; | |
4589 | ||
ec1b4cf7 | 4590 | static const struct net_proto_family l2cap_sock_family_ops = { |
1da177e4 LT |
4591 | .family = PF_BLUETOOTH, |
4592 | .owner = THIS_MODULE, | |
4593 | .create = l2cap_sock_create, | |
4594 | }; | |
4595 | ||
4596 | static struct hci_proto l2cap_hci_proto = { | |
4597 | .name = "L2CAP", | |
4598 | .id = HCI_PROTO_L2CAP, | |
4599 | .connect_ind = l2cap_connect_ind, | |
4600 | .connect_cfm = l2cap_connect_cfm, | |
4601 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4602 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4603 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4604 | .recv_acldata = l2cap_recv_acldata |
4605 | }; | |
4606 | ||
4607 | static int __init l2cap_init(void) | |
4608 | { | |
4609 | int err; | |
be9d1227 | 4610 | |
1da177e4 LT |
4611 | err = proto_register(&l2cap_proto, 0); |
4612 | if (err < 0) | |
4613 | return err; | |
4614 | ||
1890d36b GP |
4615 | _busy_wq = create_singlethread_workqueue("l2cap"); |
4616 | if (!_busy_wq) | |
4617 | goto error; | |
4618 | ||
1da177e4 LT |
4619 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); |
4620 | if (err < 0) { | |
4621 | BT_ERR("L2CAP socket registration failed"); | |
4622 | goto error; | |
4623 | } | |
4624 | ||
4625 | err = hci_register_proto(&l2cap_hci_proto); | |
4626 | if (err < 0) { | |
4627 | BT_ERR("L2CAP protocol registration failed"); | |
4628 | bt_sock_unregister(BTPROTO_L2CAP); | |
4629 | goto error; | |
4630 | } | |
4631 | ||
aef7d97c MH |
4632 | if (bt_debugfs) { |
4633 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4634 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4635 | if (!l2cap_debugfs) | |
4636 | BT_ERR("Failed to create L2CAP debug file"); | |
4637 | } | |
1da177e4 LT |
4638 | |
4639 | BT_INFO("L2CAP ver %s", VERSION); | |
4640 | BT_INFO("L2CAP socket layer initialized"); | |
4641 | ||
4642 | return 0; | |
4643 | ||
4644 | error: | |
4645 | proto_unregister(&l2cap_proto); | |
4646 | return err; | |
4647 | } | |
4648 | ||
4649 | static void __exit l2cap_exit(void) | |
4650 | { | |
aef7d97c | 4651 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4652 | |
1890d36b GP |
4653 | flush_workqueue(_busy_wq); |
4654 | destroy_workqueue(_busy_wq); | |
4655 | ||
1da177e4 LT |
4656 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) |
4657 | BT_ERR("L2CAP socket unregistration failed"); | |
4658 | ||
4659 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
4660 | BT_ERR("L2CAP protocol unregistration failed"); | |
4661 | ||
4662 | proto_unregister(&l2cap_proto); | |
4663 | } | |
4664 | ||
4665 | void l2cap_load(void) | |
4666 | { | |
4667 | /* Dummy function to trigger automatic L2CAP module loading by | |
4668 | * other modules that use L2CAP sockets but don't use any other | |
4669 | * symbols from it. */ | |
4670 | return; | |
4671 | } | |
4672 | EXPORT_SYMBOL(l2cap_load); | |
4673 | ||
4674 | module_init(l2cap_init); | |
4675 | module_exit(l2cap_exit); | |
4676 | ||
44dd46de MH |
4677 | module_param(enable_ertm, bool, 0644); |
4678 | MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); | |
4679 | ||
5fbcd3d1 MH |
4680 | module_param(max_transmit, uint, 0644); |
4681 | MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)"); | |
4682 | ||
369ba302 GP |
4683 | module_param(tx_window, uint, 0644); |
4684 | MODULE_PARM_DESC(tx_window, "Transmission window size value (default = 63)"); | |
4685 | ||
63fbd24e | 4686 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
4687 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4688 | MODULE_VERSION(VERSION); | |
4689 | MODULE_LICENSE("GPL"); | |
4690 | MODULE_ALIAS("bt-proto-0"); |