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Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
2 | BlueZ - Bluetooth protocol stack for Linux |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
4 | ||
5 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License version 2 as | |
9 | published by the Free Software Foundation; | |
10 | ||
11 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
12 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
13 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
14 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
15 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
16 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
18 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
19 | ||
8e87d142 YH |
20 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
21 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
22 | SOFTWARE IS DISCLAIMED. |
23 | */ | |
24 | ||
25 | /* Bluetooth L2CAP core and sockets. */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | ||
29 | #include <linux/types.h> | |
4fc268d2 | 30 | #include <linux/capability.h> |
1da177e4 LT |
31 | #include <linux/errno.h> |
32 | #include <linux/kernel.h> | |
1da177e4 LT |
33 | #include <linux/sched.h> |
34 | #include <linux/slab.h> | |
35 | #include <linux/poll.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/socket.h> | |
40 | #include <linux/skbuff.h> | |
1da177e4 | 41 | #include <linux/list.h> |
be9d1227 | 42 | #include <linux/device.h> |
aef7d97c MH |
43 | #include <linux/debugfs.h> |
44 | #include <linux/seq_file.h> | |
af05b30b | 45 | #include <linux/uaccess.h> |
fcc203c3 | 46 | #include <linux/crc16.h> |
1da177e4 LT |
47 | #include <net/sock.h> |
48 | ||
49 | #include <asm/system.h> | |
1da177e4 LT |
50 | #include <asm/unaligned.h> |
51 | ||
52 | #include <net/bluetooth/bluetooth.h> | |
53 | #include <net/bluetooth/hci_core.h> | |
54 | #include <net/bluetooth/l2cap.h> | |
55 | ||
44dd46de MH |
56 | #define VERSION "2.14" |
57 | ||
84fb0a63 GP |
58 | #ifdef CONFIG_BT_L2CAP_EXT_FEATURES |
59 | static int enable_ertm = 1; | |
60 | #else | |
44dd46de | 61 | static int enable_ertm = 0; |
84fb0a63 | 62 | #endif |
5fbcd3d1 | 63 | static int max_transmit = L2CAP_DEFAULT_MAX_TX; |
369ba302 | 64 | static int tx_window = L2CAP_DEFAULT_TX_WINDOW; |
f0709e03 | 65 | |
47ec1dcd | 66 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 67 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 68 | |
90ddc4f0 | 69 | static const struct proto_ops l2cap_sock_ops; |
1da177e4 LT |
70 | |
71 | static struct bt_sock_list l2cap_sk_list = { | |
d5fb2962 | 72 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
73 | }; |
74 | ||
1da177e4 LT |
75 | static void __l2cap_sock_close(struct sock *sk, int reason); |
76 | static void l2cap_sock_close(struct sock *sk); | |
77 | static void l2cap_sock_kill(struct sock *sk); | |
78 | ||
79 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
80 | u8 code, u8 ident, u16 dlen, void *data); | |
81 | ||
82 | /* ---- L2CAP timers ---- */ | |
83 | static void l2cap_sock_timeout(unsigned long arg) | |
84 | { | |
85 | struct sock *sk = (struct sock *) arg; | |
b1235d79 | 86 | int reason; |
1da177e4 LT |
87 | |
88 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
89 | ||
90 | bh_lock_sock(sk); | |
b1235d79 | 91 | |
f62e4323 MH |
92 | if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) |
93 | reason = ECONNREFUSED; | |
94 | else if (sk->sk_state == BT_CONNECT && | |
2af6b9d5 | 95 | l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) |
b1235d79 MH |
96 | reason = ECONNREFUSED; |
97 | else | |
98 | reason = ETIMEDOUT; | |
99 | ||
100 | __l2cap_sock_close(sk, reason); | |
101 | ||
1da177e4 LT |
102 | bh_unlock_sock(sk); |
103 | ||
104 | l2cap_sock_kill(sk); | |
105 | sock_put(sk); | |
106 | } | |
107 | ||
108 | static void l2cap_sock_set_timer(struct sock *sk, long timeout) | |
109 | { | |
110 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
111 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
112 | } | |
113 | ||
114 | static void l2cap_sock_clear_timer(struct sock *sk) | |
115 | { | |
116 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
117 | sk_stop_timer(sk, &sk->sk_timer); | |
118 | } | |
119 | ||
0139418c MH |
120 | /* ---- L2CAP channels ---- */ |
121 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
122 | { | |
123 | struct sock *s; | |
124 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
125 | if (l2cap_pi(s)->dcid == cid) | |
126 | break; | |
127 | } | |
128 | return s; | |
129 | } | |
130 | ||
131 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
132 | { | |
133 | struct sock *s; | |
134 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
135 | if (l2cap_pi(s)->scid == cid) | |
136 | break; | |
137 | } | |
138 | return s; | |
139 | } | |
140 | ||
141 | /* Find channel with given SCID. | |
142 | * Returns locked socket */ | |
143 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
144 | { | |
145 | struct sock *s; | |
146 | read_lock(&l->lock); | |
147 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
148 | if (s) |
149 | bh_lock_sock(s); | |
0139418c MH |
150 | read_unlock(&l->lock); |
151 | return s; | |
152 | } | |
153 | ||
154 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
155 | { | |
156 | struct sock *s; | |
157 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
158 | if (l2cap_pi(s)->ident == ident) | |
159 | break; | |
160 | } | |
161 | return s; | |
162 | } | |
163 | ||
164 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
165 | { | |
166 | struct sock *s; | |
167 | read_lock(&l->lock); | |
168 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
169 | if (s) |
170 | bh_lock_sock(s); | |
0139418c MH |
171 | read_unlock(&l->lock); |
172 | return s; | |
173 | } | |
174 | ||
175 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
176 | { | |
8db4dc46 | 177 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 178 | |
8db4dc46 | 179 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 180 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
181 | return cid; |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
188 | { | |
189 | sock_hold(sk); | |
190 | ||
191 | if (l->head) | |
192 | l2cap_pi(l->head)->prev_c = sk; | |
193 | ||
194 | l2cap_pi(sk)->next_c = l->head; | |
195 | l2cap_pi(sk)->prev_c = NULL; | |
196 | l->head = sk; | |
197 | } | |
198 | ||
199 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
200 | { | |
201 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
202 | ||
fd1278d7 | 203 | write_lock_bh(&l->lock); |
0139418c MH |
204 | if (sk == l->head) |
205 | l->head = next; | |
206 | ||
207 | if (next) | |
208 | l2cap_pi(next)->prev_c = prev; | |
209 | if (prev) | |
210 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 211 | write_unlock_bh(&l->lock); |
0139418c MH |
212 | |
213 | __sock_put(sk); | |
214 | } | |
215 | ||
216 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
217 | { | |
218 | struct l2cap_chan_list *l = &conn->chan_list; | |
219 | ||
af05b30b GP |
220 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
221 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 222 | |
2950f21a MH |
223 | conn->disc_reason = 0x13; |
224 | ||
0139418c MH |
225 | l2cap_pi(sk)->conn = conn; |
226 | ||
bd3c9e25 | 227 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
0139418c MH |
228 | /* Alloc CID for connection-oriented socket */ |
229 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
230 | } else if (sk->sk_type == SOCK_DGRAM) { | |
231 | /* Connectionless socket */ | |
8db4dc46 GP |
232 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
233 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
234 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
235 | } else { | |
236 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
237 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
238 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
239 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
240 | } | |
241 | ||
242 | __l2cap_chan_link(l, sk); | |
243 | ||
244 | if (parent) | |
245 | bt_accept_enqueue(parent, sk); | |
246 | } | |
247 | ||
8e87d142 | 248 | /* Delete channel. |
0139418c MH |
249 | * Must be called on the locked socket. */ |
250 | static void l2cap_chan_del(struct sock *sk, int err) | |
251 | { | |
252 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
253 | struct sock *parent = bt_sk(sk)->parent; | |
254 | ||
255 | l2cap_sock_clear_timer(sk); | |
256 | ||
257 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
258 | ||
8e87d142 | 259 | if (conn) { |
0139418c MH |
260 | /* Unlink from channel list */ |
261 | l2cap_chan_unlink(&conn->chan_list, sk); | |
262 | l2cap_pi(sk)->conn = NULL; | |
263 | hci_conn_put(conn->hcon); | |
264 | } | |
265 | ||
b1235d79 | 266 | sk->sk_state = BT_CLOSED; |
0139418c MH |
267 | sock_set_flag(sk, SOCK_ZAPPED); |
268 | ||
269 | if (err) | |
270 | sk->sk_err = err; | |
271 | ||
272 | if (parent) { | |
273 | bt_accept_unlink(sk); | |
274 | parent->sk_data_ready(parent, 0); | |
275 | } else | |
276 | sk->sk_state_change(sk); | |
277 | } | |
278 | ||
79d554a6 | 279 | /* Service level security */ |
2af6b9d5 | 280 | static inline int l2cap_check_security(struct sock *sk) |
79d554a6 MH |
281 | { |
282 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
0684e5f9 MH |
283 | __u8 auth_type; |
284 | ||
00ae4af9 MH |
285 | if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
286 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
287 | auth_type = HCI_AT_NO_BONDING_MITM; | |
288 | else | |
af05b30b | 289 | auth_type = HCI_AT_NO_BONDING; |
00ae4af9 MH |
290 | |
291 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
292 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
293 | } else { | |
294 | switch (l2cap_pi(sk)->sec_level) { | |
295 | case BT_SECURITY_HIGH: | |
296 | auth_type = HCI_AT_GENERAL_BONDING_MITM; | |
297 | break; | |
298 | case BT_SECURITY_MEDIUM: | |
299 | auth_type = HCI_AT_GENERAL_BONDING; | |
300 | break; | |
301 | default: | |
302 | auth_type = HCI_AT_NO_BONDING; | |
303 | break; | |
304 | } | |
0684e5f9 | 305 | } |
79d554a6 | 306 | |
0684e5f9 MH |
307 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
308 | auth_type); | |
79d554a6 MH |
309 | } |
310 | ||
4e8402a3 MH |
311 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
312 | { | |
313 | u8 id; | |
314 | ||
315 | /* Get next available identificator. | |
316 | * 1 - 128 are used by kernel. | |
317 | * 129 - 199 are reserved. | |
318 | * 200 - 254 are used by utilities like l2ping, etc. | |
319 | */ | |
320 | ||
321 | spin_lock_bh(&conn->lock); | |
322 | ||
323 | if (++conn->tx_ident > 128) | |
324 | conn->tx_ident = 1; | |
325 | ||
326 | id = conn->tx_ident; | |
327 | ||
328 | spin_unlock_bh(&conn->lock); | |
329 | ||
330 | return id; | |
331 | } | |
332 | ||
333 | static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) | |
334 | { | |
335 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
336 | ||
337 | BT_DBG("code 0x%2.2x", code); | |
338 | ||
339 | if (!skb) | |
340 | return -ENOMEM; | |
341 | ||
342 | return hci_send_acl(conn->hcon, skb, 0); | |
343 | } | |
344 | ||
1c2acffb GP |
345 | static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
346 | { | |
347 | struct sk_buff *skb; | |
348 | struct l2cap_hdr *lh; | |
349 | struct l2cap_conn *conn = pi->conn; | |
fcc203c3 GP |
350 | int count, hlen = L2CAP_HDR_SIZE + 2; |
351 | ||
352 | if (pi->fcs == L2CAP_FCS_CRC16) | |
353 | hlen += 2; | |
1c2acffb GP |
354 | |
355 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
356 | ||
fcc203c3 | 357 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
358 | control |= L2CAP_CTRL_FRAME_TYPE; |
359 | ||
9e917af1 GP |
360 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
361 | control |= L2CAP_CTRL_FINAL; | |
362 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
363 | } | |
364 | ||
f0946ccf GP |
365 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
366 | control |= L2CAP_CTRL_POLL; | |
367 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
368 | } | |
369 | ||
1c2acffb GP |
370 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
371 | if (!skb) | |
372 | return -ENOMEM; | |
373 | ||
374 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 375 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
376 | lh->cid = cpu_to_le16(pi->dcid); |
377 | put_unaligned_le16(control, skb_put(skb, 2)); | |
378 | ||
fcc203c3 GP |
379 | if (pi->fcs == L2CAP_FCS_CRC16) { |
380 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
381 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
382 | } | |
383 | ||
1c2acffb GP |
384 | return hci_send_acl(pi->conn->hcon, skb, 0); |
385 | } | |
386 | ||
7e743090 GP |
387 | static inline int l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
388 | { | |
389 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) | |
390 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
391 | else | |
392 | control |= L2CAP_SUPER_RCV_READY; | |
393 | ||
2ab25cdd GP |
394 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
395 | ||
7e743090 GP |
396 | return l2cap_send_sframe(pi, control); |
397 | } | |
398 | ||
79d554a6 MH |
399 | static void l2cap_do_start(struct sock *sk) |
400 | { | |
401 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
402 | ||
403 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
404 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
405 | return; | |
406 | ||
2af6b9d5 | 407 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
408 | struct l2cap_conn_req req; |
409 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
410 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 411 | |
b1235d79 | 412 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 413 | |
b1235d79 | 414 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 415 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 416 | } |
79d554a6 MH |
417 | } else { |
418 | struct l2cap_info_req req; | |
419 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
420 | ||
421 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
422 | conn->info_ident = l2cap_get_ident(conn); | |
423 | ||
424 | mod_timer(&conn->info_timer, jiffies + | |
425 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
426 | ||
427 | l2cap_send_cmd(conn, conn->info_ident, | |
428 | L2CAP_INFO_REQ, sizeof(req), &req); | |
429 | } | |
430 | } | |
431 | ||
22121fc9 GP |
432 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk) |
433 | { | |
434 | struct l2cap_disconn_req req; | |
435 | ||
436 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
437 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
438 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
439 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
440 | } | |
441 | ||
1da177e4 | 442 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
443 | static void l2cap_conn_start(struct l2cap_conn *conn) |
444 | { | |
445 | struct l2cap_chan_list *l = &conn->chan_list; | |
446 | struct sock *sk; | |
447 | ||
448 | BT_DBG("conn %p", conn); | |
449 | ||
450 | read_lock(&l->lock); | |
451 | ||
452 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
453 | bh_lock_sock(sk); | |
454 | ||
bd3c9e25 GP |
455 | if (sk->sk_type != SOCK_SEQPACKET && |
456 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
457 | bh_unlock_sock(sk); |
458 | continue; | |
459 | } | |
460 | ||
461 | if (sk->sk_state == BT_CONNECT) { | |
2af6b9d5 | 462 | if (l2cap_check_security(sk)) { |
b1235d79 MH |
463 | struct l2cap_conn_req req; |
464 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
465 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 466 | |
b1235d79 | 467 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
79d554a6 | 468 | |
b1235d79 | 469 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4e8402a3 | 470 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 471 | } |
79d554a6 MH |
472 | } else if (sk->sk_state == BT_CONNECT2) { |
473 | struct l2cap_conn_rsp rsp; | |
474 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
475 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
476 | ||
2af6b9d5 | 477 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
478 | if (bt_sk(sk)->defer_setup) { |
479 | struct sock *parent = bt_sk(sk)->parent; | |
480 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
481 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
482 | parent->sk_data_ready(parent, 0); | |
483 | ||
484 | } else { | |
485 | sk->sk_state = BT_CONFIG; | |
486 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
487 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
488 | } | |
79d554a6 MH |
489 | } else { |
490 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
491 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
492 | } | |
493 | ||
494 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
495 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4e8402a3 MH |
496 | } |
497 | ||
498 | bh_unlock_sock(sk); | |
499 | } | |
500 | ||
501 | read_unlock(&l->lock); | |
502 | } | |
503 | ||
504 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
505 | { | |
79d554a6 MH |
506 | struct l2cap_chan_list *l = &conn->chan_list; |
507 | struct sock *sk; | |
4e8402a3 | 508 | |
79d554a6 | 509 | BT_DBG("conn %p", conn); |
4e8402a3 | 510 | |
79d554a6 | 511 | read_lock(&l->lock); |
4e8402a3 | 512 | |
79d554a6 MH |
513 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
514 | bh_lock_sock(sk); | |
4e8402a3 | 515 | |
bd3c9e25 GP |
516 | if (sk->sk_type != SOCK_SEQPACKET && |
517 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
518 | l2cap_sock_clear_timer(sk); |
519 | sk->sk_state = BT_CONNECTED; | |
520 | sk->sk_state_change(sk); | |
521 | } else if (sk->sk_state == BT_CONNECT) | |
522 | l2cap_do_start(sk); | |
4e8402a3 | 523 | |
79d554a6 | 524 | bh_unlock_sock(sk); |
4e8402a3 | 525 | } |
79d554a6 MH |
526 | |
527 | read_unlock(&l->lock); | |
4e8402a3 MH |
528 | } |
529 | ||
530 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
531 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
532 | { | |
533 | struct l2cap_chan_list *l = &conn->chan_list; | |
534 | struct sock *sk; | |
535 | ||
536 | BT_DBG("conn %p", conn); | |
537 | ||
538 | read_lock(&l->lock); | |
539 | ||
540 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 541 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
542 | sk->sk_err = err; |
543 | } | |
544 | ||
545 | read_unlock(&l->lock); | |
546 | } | |
547 | ||
548 | static void l2cap_info_timeout(unsigned long arg) | |
549 | { | |
550 | struct l2cap_conn *conn = (void *) arg; | |
551 | ||
984947dc | 552 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 553 | conn->info_ident = 0; |
984947dc | 554 | |
4e8402a3 MH |
555 | l2cap_conn_start(conn); |
556 | } | |
557 | ||
1da177e4 LT |
558 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
559 | { | |
0139418c | 560 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 561 | |
0139418c | 562 | if (conn || status) |
1da177e4 LT |
563 | return conn; |
564 | ||
0139418c MH |
565 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
566 | if (!conn) | |
1da177e4 | 567 | return NULL; |
1da177e4 LT |
568 | |
569 | hcon->l2cap_data = conn; | |
570 | conn->hcon = hcon; | |
571 | ||
0139418c MH |
572 | BT_DBG("hcon %p conn %p", hcon, conn); |
573 | ||
1da177e4 LT |
574 | conn->mtu = hcon->hdev->acl_mtu; |
575 | conn->src = &hcon->hdev->bdaddr; | |
576 | conn->dst = &hcon->dst; | |
577 | ||
4e8402a3 MH |
578 | conn->feat_mask = 0; |
579 | ||
1da177e4 LT |
580 | spin_lock_init(&conn->lock); |
581 | rwlock_init(&conn->chan_list.lock); | |
582 | ||
45054dc1 DY |
583 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
584 | (unsigned long) conn); | |
585 | ||
2950f21a MH |
586 | conn->disc_reason = 0x13; |
587 | ||
1da177e4 LT |
588 | return conn; |
589 | } | |
590 | ||
0139418c | 591 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 592 | { |
0139418c | 593 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
594 | struct sock *sk; |
595 | ||
0139418c MH |
596 | if (!conn) |
597 | return; | |
1da177e4 LT |
598 | |
599 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
600 | ||
7585b97a | 601 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
602 | |
603 | /* Kill channels */ | |
604 | while ((sk = conn->chan_list.head)) { | |
605 | bh_lock_sock(sk); | |
606 | l2cap_chan_del(sk, err); | |
607 | bh_unlock_sock(sk); | |
608 | l2cap_sock_kill(sk); | |
609 | } | |
610 | ||
8e8440f5 DY |
611 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
612 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 613 | |
1da177e4 LT |
614 | hcon->l2cap_data = NULL; |
615 | kfree(conn); | |
1da177e4 LT |
616 | } |
617 | ||
618 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
619 | { | |
620 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 621 | write_lock_bh(&l->lock); |
1da177e4 | 622 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 623 | write_unlock_bh(&l->lock); |
1da177e4 LT |
624 | } |
625 | ||
1da177e4 | 626 | /* ---- Socket interface ---- */ |
8e036fc3 | 627 | static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) |
1da177e4 LT |
628 | { |
629 | struct sock *sk; | |
630 | struct hlist_node *node; | |
631 | sk_for_each(sk, node, &l2cap_sk_list.head) | |
632 | if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) | |
633 | goto found; | |
634 | sk = NULL; | |
635 | found: | |
636 | return sk; | |
637 | } | |
638 | ||
639 | /* Find socket with psm and source bdaddr. | |
640 | * Returns closest match. | |
641 | */ | |
8e036fc3 | 642 | static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
643 | { |
644 | struct sock *sk = NULL, *sk1 = NULL; | |
645 | struct hlist_node *node; | |
646 | ||
647 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
648 | if (state && sk->sk_state != state) | |
649 | continue; | |
650 | ||
651 | if (l2cap_pi(sk)->psm == psm) { | |
652 | /* Exact match. */ | |
653 | if (!bacmp(&bt_sk(sk)->src, src)) | |
654 | break; | |
655 | ||
656 | /* Closest match */ | |
657 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
658 | sk1 = sk; | |
659 | } | |
660 | } | |
661 | return node ? sk : sk1; | |
662 | } | |
663 | ||
664 | /* Find socket with given address (psm, src). | |
665 | * Returns locked socket */ | |
8e036fc3 | 666 | static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
667 | { |
668 | struct sock *s; | |
669 | read_lock(&l2cap_sk_list.lock); | |
670 | s = __l2cap_get_sock_by_psm(state, psm, src); | |
af05b30b GP |
671 | if (s) |
672 | bh_lock_sock(s); | |
1da177e4 LT |
673 | read_unlock(&l2cap_sk_list.lock); |
674 | return s; | |
675 | } | |
676 | ||
677 | static void l2cap_sock_destruct(struct sock *sk) | |
678 | { | |
679 | BT_DBG("sk %p", sk); | |
680 | ||
681 | skb_queue_purge(&sk->sk_receive_queue); | |
682 | skb_queue_purge(&sk->sk_write_queue); | |
683 | } | |
684 | ||
685 | static void l2cap_sock_cleanup_listen(struct sock *parent) | |
686 | { | |
687 | struct sock *sk; | |
688 | ||
689 | BT_DBG("parent %p", parent); | |
690 | ||
691 | /* Close not yet accepted channels */ | |
692 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
693 | l2cap_sock_close(sk); | |
694 | ||
b1235d79 | 695 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
696 | sock_set_flag(parent, SOCK_ZAPPED); |
697 | } | |
698 | ||
699 | /* Kill socket (only if zapped and orphan) | |
700 | * Must be called on unlocked socket. | |
701 | */ | |
702 | static void l2cap_sock_kill(struct sock *sk) | |
703 | { | |
704 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
705 | return; | |
706 | ||
707 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
708 | ||
709 | /* Kill poor orphan */ | |
710 | bt_sock_unlink(&l2cap_sk_list, sk); | |
711 | sock_set_flag(sk, SOCK_DEAD); | |
712 | sock_put(sk); | |
713 | } | |
714 | ||
715 | static void __l2cap_sock_close(struct sock *sk, int reason) | |
716 | { | |
717 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
718 | ||
719 | switch (sk->sk_state) { | |
720 | case BT_LISTEN: | |
721 | l2cap_sock_cleanup_listen(sk); | |
722 | break; | |
723 | ||
724 | case BT_CONNECTED: | |
725 | case BT_CONFIG: | |
bd3c9e25 GP |
726 | if (sk->sk_type == SOCK_SEQPACKET || |
727 | sk->sk_type == SOCK_STREAM) { | |
1da177e4 | 728 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1da177e4 LT |
729 | |
730 | sk->sk_state = BT_DISCONN; | |
731 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
22121fc9 | 732 | l2cap_send_disconn_req(conn, sk); |
b1235d79 | 733 | } else |
1da177e4 | 734 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
735 | break; |
736 | ||
f66dc81f | 737 | case BT_CONNECT2: |
bd3c9e25 GP |
738 | if (sk->sk_type == SOCK_SEQPACKET || |
739 | sk->sk_type == SOCK_STREAM) { | |
f66dc81f MH |
740 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
741 | struct l2cap_conn_rsp rsp; | |
742 | __u16 result; | |
743 | ||
744 | if (bt_sk(sk)->defer_setup) | |
745 | result = L2CAP_CR_SEC_BLOCK; | |
746 | else | |
747 | result = L2CAP_CR_BAD_PSM; | |
748 | ||
749 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
750 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
751 | rsp.result = cpu_to_le16(result); | |
752 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
753 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
754 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
755 | } else | |
756 | l2cap_chan_del(sk, reason); | |
757 | break; | |
758 | ||
1da177e4 LT |
759 | case BT_CONNECT: |
760 | case BT_DISCONN: | |
761 | l2cap_chan_del(sk, reason); | |
762 | break; | |
763 | ||
764 | default: | |
765 | sock_set_flag(sk, SOCK_ZAPPED); | |
766 | break; | |
767 | } | |
768 | } | |
769 | ||
770 | /* Must be called on unlocked socket. */ | |
771 | static void l2cap_sock_close(struct sock *sk) | |
772 | { | |
773 | l2cap_sock_clear_timer(sk); | |
774 | lock_sock(sk); | |
775 | __l2cap_sock_close(sk, ECONNRESET); | |
776 | release_sock(sk); | |
777 | l2cap_sock_kill(sk); | |
778 | } | |
779 | ||
780 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) | |
781 | { | |
782 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
783 | ||
784 | BT_DBG("sk %p", sk); | |
785 | ||
786 | if (parent) { | |
787 | sk->sk_type = parent->sk_type; | |
f66dc81f MH |
788 | bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; |
789 | ||
1da177e4 LT |
790 | pi->imtu = l2cap_pi(parent)->imtu; |
791 | pi->omtu = l2cap_pi(parent)->omtu; | |
c6b03cf9 MH |
792 | pi->mode = l2cap_pi(parent)->mode; |
793 | pi->fcs = l2cap_pi(parent)->fcs; | |
68d7f0ce | 794 | pi->max_tx = l2cap_pi(parent)->max_tx; |
14b5aa71 | 795 | pi->tx_win = l2cap_pi(parent)->tx_win; |
2af6b9d5 MH |
796 | pi->sec_level = l2cap_pi(parent)->sec_level; |
797 | pi->role_switch = l2cap_pi(parent)->role_switch; | |
798 | pi->force_reliable = l2cap_pi(parent)->force_reliable; | |
1da177e4 LT |
799 | } else { |
800 | pi->imtu = L2CAP_DEFAULT_MTU; | |
801 | pi->omtu = 0; | |
bd3c9e25 GP |
802 | if (enable_ertm && sk->sk_type == SOCK_STREAM) |
803 | pi->mode = L2CAP_MODE_ERTM; | |
804 | else | |
805 | pi->mode = L2CAP_MODE_BASIC; | |
68d7f0ce | 806 | pi->max_tx = max_transmit; |
c6b03cf9 | 807 | pi->fcs = L2CAP_FCS_CRC16; |
369ba302 | 808 | pi->tx_win = tx_window; |
2af6b9d5 MH |
809 | pi->sec_level = BT_SECURITY_LOW; |
810 | pi->role_switch = 0; | |
811 | pi->force_reliable = 0; | |
1da177e4 LT |
812 | } |
813 | ||
814 | /* Default config options */ | |
5dee9e7c | 815 | pi->conf_len = 0; |
1da177e4 | 816 | pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
45054dc1 DY |
817 | skb_queue_head_init(TX_QUEUE(sk)); |
818 | skb_queue_head_init(SREJ_QUEUE(sk)); | |
819 | INIT_LIST_HEAD(SREJ_LIST(sk)); | |
1da177e4 LT |
820 | } |
821 | ||
822 | static struct proto l2cap_proto = { | |
823 | .name = "L2CAP", | |
824 | .owner = THIS_MODULE, | |
825 | .obj_size = sizeof(struct l2cap_pinfo) | |
826 | }; | |
827 | ||
1b8d7ae4 | 828 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
829 | { |
830 | struct sock *sk; | |
831 | ||
6257ff21 | 832 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); |
1da177e4 LT |
833 | if (!sk) |
834 | return NULL; | |
835 | ||
836 | sock_init_data(sock, sk); | |
837 | INIT_LIST_HEAD(&bt_sk(sk)->accept_q); | |
838 | ||
839 | sk->sk_destruct = l2cap_sock_destruct; | |
4e8402a3 | 840 | sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); |
1da177e4 LT |
841 | |
842 | sock_reset_flag(sk, SOCK_ZAPPED); | |
843 | ||
844 | sk->sk_protocol = proto; | |
b1235d79 | 845 | sk->sk_state = BT_OPEN; |
1da177e4 | 846 | |
b1235d79 | 847 | setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); |
1da177e4 LT |
848 | |
849 | bt_sock_link(&l2cap_sk_list, sk); | |
850 | return sk; | |
851 | } | |
852 | ||
3f378b68 EP |
853 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
854 | int kern) | |
1da177e4 LT |
855 | { |
856 | struct sock *sk; | |
857 | ||
858 | BT_DBG("sock %p", sock); | |
859 | ||
860 | sock->state = SS_UNCONNECTED; | |
861 | ||
bd3c9e25 | 862 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && |
1da177e4 LT |
863 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
864 | return -ESOCKTNOSUPPORT; | |
865 | ||
c84b3268 | 866 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
1da177e4 LT |
867 | return -EPERM; |
868 | ||
869 | sock->ops = &l2cap_sock_ops; | |
870 | ||
1b8d7ae4 | 871 | sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
1da177e4 LT |
872 | if (!sk) |
873 | return -ENOMEM; | |
874 | ||
875 | l2cap_sock_init(sk, NULL); | |
876 | return 0; | |
877 | } | |
878 | ||
f29972de | 879 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
1da177e4 | 880 | { |
1da177e4 | 881 | struct sock *sk = sock->sk; |
f29972de MH |
882 | struct sockaddr_l2 la; |
883 | int len, err = 0; | |
1da177e4 | 884 | |
f29972de | 885 | BT_DBG("sk %p", sk); |
1da177e4 LT |
886 | |
887 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
888 | return -EINVAL; | |
889 | ||
f29972de MH |
890 | memset(&la, 0, sizeof(la)); |
891 | len = min_t(unsigned int, sizeof(la), alen); | |
892 | memcpy(&la, addr, len); | |
893 | ||
2a517ca6 MH |
894 | if (la.l2_cid) |
895 | return -EINVAL; | |
896 | ||
1da177e4 LT |
897 | lock_sock(sk); |
898 | ||
899 | if (sk->sk_state != BT_OPEN) { | |
900 | err = -EBADFD; | |
901 | goto done; | |
902 | } | |
903 | ||
b4324b5d | 904 | if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && |
847641d7 MH |
905 | !capable(CAP_NET_BIND_SERVICE)) { |
906 | err = -EACCES; | |
907 | goto done; | |
908 | } | |
8e87d142 | 909 | |
1da177e4 LT |
910 | write_lock_bh(&l2cap_sk_list.lock); |
911 | ||
f29972de | 912 | if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { |
1da177e4 LT |
913 | err = -EADDRINUSE; |
914 | } else { | |
915 | /* Save source address */ | |
f29972de MH |
916 | bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); |
917 | l2cap_pi(sk)->psm = la.l2_psm; | |
918 | l2cap_pi(sk)->sport = la.l2_psm; | |
1da177e4 | 919 | sk->sk_state = BT_BOUND; |
2af6b9d5 | 920 | |
b4324b5d MH |
921 | if (__le16_to_cpu(la.l2_psm) == 0x0001 || |
922 | __le16_to_cpu(la.l2_psm) == 0x0003) | |
2af6b9d5 | 923 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; |
1da177e4 LT |
924 | } |
925 | ||
926 | write_unlock_bh(&l2cap_sk_list.lock); | |
927 | ||
928 | done: | |
929 | release_sock(sk); | |
930 | return err; | |
931 | } | |
932 | ||
933 | static int l2cap_do_connect(struct sock *sk) | |
934 | { | |
935 | bdaddr_t *src = &bt_sk(sk)->src; | |
936 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
937 | struct l2cap_conn *conn; | |
938 | struct hci_conn *hcon; | |
939 | struct hci_dev *hdev; | |
09ab6f4c | 940 | __u8 auth_type; |
44d0e48e | 941 | int err; |
1da177e4 | 942 | |
f29972de MH |
943 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
944 | l2cap_pi(sk)->psm); | |
1da177e4 | 945 | |
af05b30b GP |
946 | hdev = hci_get_route(dst, src); |
947 | if (!hdev) | |
1da177e4 LT |
948 | return -EHOSTUNREACH; |
949 | ||
950 | hci_dev_lock_bh(hdev); | |
951 | ||
952 | err = -ENOMEM; | |
953 | ||
8c1b2355 | 954 | if (sk->sk_type == SOCK_RAW) { |
2af6b9d5 MH |
955 | switch (l2cap_pi(sk)->sec_level) { |
956 | case BT_SECURITY_HIGH: | |
8c1b2355 | 957 | auth_type = HCI_AT_DEDICATED_BONDING_MITM; |
2af6b9d5 MH |
958 | break; |
959 | case BT_SECURITY_MEDIUM: | |
8c1b2355 | 960 | auth_type = HCI_AT_DEDICATED_BONDING; |
2af6b9d5 MH |
961 | break; |
962 | default: | |
09ab6f4c | 963 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
964 | break; |
965 | } | |
8c1b2355 | 966 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { |
2af6b9d5 | 967 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8c1b2355 | 968 | auth_type = HCI_AT_NO_BONDING_MITM; |
09ab6f4c | 969 | else |
8c1b2355 | 970 | auth_type = HCI_AT_NO_BONDING; |
435fef20 MH |
971 | |
972 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
973 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
8c1b2355 | 974 | } else { |
2af6b9d5 MH |
975 | switch (l2cap_pi(sk)->sec_level) { |
976 | case BT_SECURITY_HIGH: | |
8c1b2355 | 977 | auth_type = HCI_AT_GENERAL_BONDING_MITM; |
2af6b9d5 MH |
978 | break; |
979 | case BT_SECURITY_MEDIUM: | |
09ab6f4c | 980 | auth_type = HCI_AT_GENERAL_BONDING; |
2af6b9d5 MH |
981 | break; |
982 | default: | |
8c1b2355 | 983 | auth_type = HCI_AT_NO_BONDING; |
2af6b9d5 MH |
984 | break; |
985 | } | |
09ab6f4c MH |
986 | } |
987 | ||
2af6b9d5 MH |
988 | hcon = hci_connect(hdev, ACL_LINK, dst, |
989 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
990 | if (!hcon) |
991 | goto done; | |
992 | ||
993 | conn = l2cap_conn_add(hcon, 0); | |
994 | if (!conn) { | |
995 | hci_conn_put(hcon); | |
996 | goto done; | |
997 | } | |
998 | ||
999 | err = 0; | |
1000 | ||
1001 | /* Update source addr of the socket */ | |
1002 | bacpy(src, conn->src); | |
1003 | ||
1004 | l2cap_chan_add(conn, sk, NULL); | |
1005 | ||
1006 | sk->sk_state = BT_CONNECT; | |
1007 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
1008 | ||
1009 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
1010 | if (sk->sk_type != SOCK_SEQPACKET && |
1011 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 LT |
1012 | l2cap_sock_clear_timer(sk); |
1013 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
1014 | } else |
1015 | l2cap_do_start(sk); | |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | done: | |
1019 | hci_dev_unlock_bh(hdev); | |
1020 | hci_dev_put(hdev); | |
1021 | return err; | |
1022 | } | |
1023 | ||
1024 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
1025 | { | |
1da177e4 | 1026 | struct sock *sk = sock->sk; |
f29972de MH |
1027 | struct sockaddr_l2 la; |
1028 | int len, err = 0; | |
1da177e4 | 1029 | |
1da177e4 LT |
1030 | BT_DBG("sk %p", sk); |
1031 | ||
6503d961 CG |
1032 | if (!addr || alen < sizeof(addr->sa_family) || |
1033 | addr->sa_family != AF_BLUETOOTH) | |
2a517ca6 | 1034 | return -EINVAL; |
1da177e4 | 1035 | |
f29972de MH |
1036 | memset(&la, 0, sizeof(la)); |
1037 | len = min_t(unsigned int, sizeof(la), alen); | |
1038 | memcpy(&la, addr, len); | |
1039 | ||
2a517ca6 MH |
1040 | if (la.l2_cid) |
1041 | return -EINVAL; | |
1042 | ||
1043 | lock_sock(sk); | |
1044 | ||
bd3c9e25 GP |
1045 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) |
1046 | && !la.l2_psm) { | |
1da177e4 LT |
1047 | err = -EINVAL; |
1048 | goto done; | |
1049 | } | |
1050 | ||
c6b03cf9 MH |
1051 | switch (l2cap_pi(sk)->mode) { |
1052 | case L2CAP_MODE_BASIC: | |
1053 | break; | |
1054 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1055 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1056 | if (enable_ertm) |
1057 | break; | |
1058 | /* fall through */ | |
1059 | default: | |
1060 | err = -ENOTSUPP; | |
1061 | goto done; | |
1062 | } | |
1063 | ||
af05b30b | 1064 | switch (sk->sk_state) { |
1da177e4 LT |
1065 | case BT_CONNECT: |
1066 | case BT_CONNECT2: | |
1067 | case BT_CONFIG: | |
1068 | /* Already connecting */ | |
1069 | goto wait; | |
1070 | ||
1071 | case BT_CONNECTED: | |
1072 | /* Already connected */ | |
1073 | goto done; | |
1074 | ||
1075 | case BT_OPEN: | |
1076 | case BT_BOUND: | |
1077 | /* Can connect */ | |
1078 | break; | |
1079 | ||
1080 | default: | |
1081 | err = -EBADFD; | |
1082 | goto done; | |
1083 | } | |
1084 | ||
1085 | /* Set destination address and psm */ | |
f29972de MH |
1086 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
1087 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 1088 | |
af05b30b GP |
1089 | err = l2cap_do_connect(sk); |
1090 | if (err) | |
1da177e4 LT |
1091 | goto done; |
1092 | ||
1093 | wait: | |
1094 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
1095 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
1096 | done: | |
1097 | release_sock(sk); | |
1098 | return err; | |
1099 | } | |
1100 | ||
1101 | static int l2cap_sock_listen(struct socket *sock, int backlog) | |
1102 | { | |
1103 | struct sock *sk = sock->sk; | |
1104 | int err = 0; | |
1105 | ||
1106 | BT_DBG("sk %p backlog %d", sk, backlog); | |
1107 | ||
1108 | lock_sock(sk); | |
1109 | ||
bd3c9e25 GP |
1110 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) |
1111 | || sk->sk_state != BT_BOUND) { | |
1da177e4 LT |
1112 | err = -EBADFD; |
1113 | goto done; | |
1114 | } | |
1115 | ||
c6b03cf9 MH |
1116 | switch (l2cap_pi(sk)->mode) { |
1117 | case L2CAP_MODE_BASIC: | |
1118 | break; | |
1119 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 1120 | case L2CAP_MODE_STREAMING: |
c6b03cf9 MH |
1121 | if (enable_ertm) |
1122 | break; | |
1123 | /* fall through */ | |
1124 | default: | |
1125 | err = -ENOTSUPP; | |
1126 | goto done; | |
1127 | } | |
1128 | ||
1da177e4 LT |
1129 | if (!l2cap_pi(sk)->psm) { |
1130 | bdaddr_t *src = &bt_sk(sk)->src; | |
1131 | u16 psm; | |
1132 | ||
1133 | err = -EINVAL; | |
1134 | ||
1135 | write_lock_bh(&l2cap_sk_list.lock); | |
1136 | ||
1137 | for (psm = 0x1001; psm < 0x1100; psm += 2) | |
b4324b5d MH |
1138 | if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { |
1139 | l2cap_pi(sk)->psm = cpu_to_le16(psm); | |
1140 | l2cap_pi(sk)->sport = cpu_to_le16(psm); | |
1da177e4 LT |
1141 | err = 0; |
1142 | break; | |
1143 | } | |
1144 | ||
1145 | write_unlock_bh(&l2cap_sk_list.lock); | |
1146 | ||
1147 | if (err < 0) | |
1148 | goto done; | |
1149 | } | |
1150 | ||
1151 | sk->sk_max_ack_backlog = backlog; | |
1152 | sk->sk_ack_backlog = 0; | |
1153 | sk->sk_state = BT_LISTEN; | |
1154 | ||
1155 | done: | |
1156 | release_sock(sk); | |
1157 | return err; | |
1158 | } | |
1159 | ||
1160 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1161 | { | |
1162 | DECLARE_WAITQUEUE(wait, current); | |
1163 | struct sock *sk = sock->sk, *nsk; | |
1164 | long timeo; | |
1165 | int err = 0; | |
1166 | ||
fcc70d5f | 1167 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1168 | |
1169 | if (sk->sk_state != BT_LISTEN) { | |
1170 | err = -EBADFD; | |
1171 | goto done; | |
1172 | } | |
1173 | ||
1174 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1175 | ||
1176 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1177 | ||
1178 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 1179 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
1da177e4 LT |
1180 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1181 | set_current_state(TASK_INTERRUPTIBLE); | |
1182 | if (!timeo) { | |
1183 | err = -EAGAIN; | |
1184 | break; | |
1185 | } | |
1186 | ||
1187 | release_sock(sk); | |
1188 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1189 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1190 | |
1191 | if (sk->sk_state != BT_LISTEN) { | |
1192 | err = -EBADFD; | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | if (signal_pending(current)) { | |
1197 | err = sock_intr_errno(timeo); | |
1198 | break; | |
1199 | } | |
1200 | } | |
1201 | set_current_state(TASK_RUNNING); | |
aa395145 | 1202 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
1203 | |
1204 | if (err) | |
1205 | goto done; | |
1206 | ||
1207 | newsock->state = SS_CONNECTED; | |
1208 | ||
1209 | BT_DBG("new socket %p", nsk); | |
1210 | ||
1211 | done: | |
1212 | release_sock(sk); | |
1213 | return err; | |
1214 | } | |
1215 | ||
1216 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
1217 | { | |
1218 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1219 | struct sock *sk = sock->sk; | |
1220 | ||
1221 | BT_DBG("sock %p, sk %p", sock, sk); | |
1222 | ||
1223 | addr->sa_family = AF_BLUETOOTH; | |
1224 | *len = sizeof(struct sockaddr_l2); | |
1225 | ||
f29972de MH |
1226 | if (peer) { |
1227 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1228 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1229 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1230 | } else { |
1231 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1232 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1233 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1234 | } |
1da177e4 | 1235 | |
1da177e4 LT |
1236 | return 0; |
1237 | } | |
1238 | ||
e90bac06 GP |
1239 | static void l2cap_monitor_timeout(unsigned long arg) |
1240 | { | |
1241 | struct sock *sk = (void *) arg; | |
1242 | u16 control; | |
1243 | ||
e686219a | 1244 | bh_lock_sock(sk); |
e90bac06 GP |
1245 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
1246 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk); | |
b13f5860 | 1247 | bh_unlock_sock(sk); |
e90bac06 GP |
1248 | return; |
1249 | } | |
1250 | ||
1251 | l2cap_pi(sk)->retry_count++; | |
1252 | __mod_monitor_timer(); | |
1253 | ||
1254 | control = L2CAP_CTRL_POLL; | |
7e743090 | 1255 | l2cap_send_rr_or_rnr(l2cap_pi(sk), control); |
e686219a | 1256 | bh_unlock_sock(sk); |
e90bac06 GP |
1257 | } |
1258 | ||
1259 | static void l2cap_retrans_timeout(unsigned long arg) | |
1260 | { | |
1261 | struct sock *sk = (void *) arg; | |
1262 | u16 control; | |
1263 | ||
e686219a | 1264 | bh_lock_sock(sk); |
e90bac06 GP |
1265 | l2cap_pi(sk)->retry_count = 1; |
1266 | __mod_monitor_timer(); | |
1267 | ||
1268 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
1269 | ||
1270 | control = L2CAP_CTRL_POLL; | |
7e743090 | 1271 | l2cap_send_rr_or_rnr(l2cap_pi(sk), control); |
e686219a | 1272 | bh_unlock_sock(sk); |
e90bac06 GP |
1273 | } |
1274 | ||
1c2acffb | 1275 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 1276 | { |
1c2acffb | 1277 | struct sk_buff *skb; |
1da177e4 | 1278 | |
812e737e GP |
1279 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
1280 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
1281 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1282 | break; | |
1da177e4 | 1283 | |
1c2acffb GP |
1284 | skb = skb_dequeue(TX_QUEUE(sk)); |
1285 | kfree_skb(skb); | |
1da177e4 | 1286 | |
1c2acffb GP |
1287 | l2cap_pi(sk)->unacked_frames--; |
1288 | } | |
1da177e4 | 1289 | |
e90bac06 GP |
1290 | if (!l2cap_pi(sk)->unacked_frames) |
1291 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1292 | ||
1c2acffb GP |
1293 | return; |
1294 | } | |
1da177e4 | 1295 | |
1c2acffb GP |
1296 | static inline int l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1297 | { | |
1298 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1299 | int err; | |
1300 | ||
1301 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1302 | |
1c2acffb GP |
1303 | err = hci_send_acl(pi->conn->hcon, skb, 0); |
1304 | if (err < 0) | |
1305 | kfree_skb(skb); | |
1306 | ||
1307 | return err; | |
1308 | } | |
1309 | ||
6840ed07 GP |
1310 | static int l2cap_streaming_send(struct sock *sk) |
1311 | { | |
1312 | struct sk_buff *skb, *tx_skb; | |
1313 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1314 | u16 control, fcs; |
6840ed07 GP |
1315 | int err; |
1316 | ||
1317 | while ((skb = sk->sk_send_head)) { | |
1318 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1319 | ||
1320 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
1321 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; | |
1322 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1323 | ||
e8235c6b | 1324 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1325 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1326 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1327 | } | |
1328 | ||
6840ed07 GP |
1329 | err = l2cap_do_send(sk, tx_skb); |
1330 | if (err < 0) { | |
1331 | l2cap_send_disconn_req(pi->conn, sk); | |
1332 | return err; | |
1333 | } | |
1334 | ||
1335 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1336 | ||
1337 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1338 | sk->sk_send_head = NULL; | |
1339 | else | |
1340 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
1341 | ||
1342 | skb = skb_dequeue(TX_QUEUE(sk)); | |
1343 | kfree_skb(skb); | |
1344 | } | |
1345 | return 0; | |
1346 | } | |
1347 | ||
8f17154f GP |
1348 | static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq) |
1349 | { | |
1350 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1351 | struct sk_buff *skb, *tx_skb; | |
1352 | u16 control, fcs; | |
1353 | int err; | |
1354 | ||
1355 | skb = skb_peek(TX_QUEUE(sk)); | |
1356 | do { | |
1357 | if (bt_cb(skb)->tx_seq != tx_seq) { | |
1358 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1359 | break; | |
1360 | skb = skb_queue_next(TX_QUEUE(sk), skb); | |
1361 | continue; | |
1362 | } | |
1363 | ||
1364 | if (pi->remote_max_tx && | |
1365 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
1366 | l2cap_send_disconn_req(pi->conn, sk); | |
1367 | break; | |
1368 | } | |
1369 | ||
1370 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1371 | bt_cb(skb)->retries++; | |
1372 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
9f121a5a | 1373 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
8f17154f GP |
1374 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1375 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1376 | ||
e8235c6b | 1377 | if (pi->fcs == L2CAP_FCS_CRC16) { |
8f17154f GP |
1378 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1379 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1380 | } | |
1381 | ||
1382 | err = l2cap_do_send(sk, tx_skb); | |
1383 | if (err < 0) { | |
1384 | l2cap_send_disconn_req(pi->conn, sk); | |
1385 | return err; | |
1386 | } | |
1387 | break; | |
1388 | } while(1); | |
1389 | return 0; | |
1390 | } | |
1391 | ||
1c2acffb GP |
1392 | static int l2cap_ertm_send(struct sock *sk) |
1393 | { | |
1394 | struct sk_buff *skb, *tx_skb; | |
1395 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1396 | u16 control, fcs; |
9e917af1 | 1397 | int err, nsent = 0; |
1c2acffb | 1398 | |
e90bac06 GP |
1399 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
1400 | return 0; | |
1401 | ||
f64f9e71 JP |
1402 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) && |
1403 | !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) { | |
1c2acffb | 1404 | |
e90bac06 GP |
1405 | if (pi->remote_max_tx && |
1406 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
1407 | l2cap_send_disconn_req(pi->conn, sk); | |
1408 | break; | |
1409 | } | |
1410 | ||
e420aba3 AE |
1411 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1412 | ||
e90bac06 GP |
1413 | bt_cb(skb)->retries++; |
1414 | ||
1c2acffb | 1415 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
d5392c8f GP |
1416 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1417 | control |= L2CAP_CTRL_FINAL; | |
1418 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1419 | } | |
9f121a5a | 1420 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1421 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1422 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1423 | ||
e90bac06 | 1424 | |
e8235c6b | 1425 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1426 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1427 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1428 | } | |
1429 | ||
1c2acffb GP |
1430 | err = l2cap_do_send(sk, tx_skb); |
1431 | if (err < 0) { | |
1432 | l2cap_send_disconn_req(pi->conn, sk); | |
1433 | return err; | |
1434 | } | |
e90bac06 | 1435 | __mod_retrans_timer(); |
1c2acffb GP |
1436 | |
1437 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1438 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1439 | ||
1440 | pi->unacked_frames++; | |
d5392c8f | 1441 | pi->frames_sent++; |
1c2acffb GP |
1442 | |
1443 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1444 | sk->sk_send_head = NULL; | |
1445 | else | |
1446 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1447 | |
1448 | nsent++; | |
1c2acffb GP |
1449 | } |
1450 | ||
9e917af1 GP |
1451 | return nsent; |
1452 | } | |
1453 | ||
1454 | static int l2cap_send_ack(struct l2cap_pinfo *pi) | |
1455 | { | |
1456 | struct sock *sk = (struct sock *)pi; | |
1457 | u16 control = 0; | |
1458 | ||
1459 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1460 | ||
1461 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1462 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1463 | return l2cap_send_sframe(pi, control); | |
1464 | } else if (l2cap_ertm_send(sk) == 0) { | |
1465 | control |= L2CAP_SUPER_RCV_READY; | |
1466 | return l2cap_send_sframe(pi, control); | |
1467 | } | |
1c2acffb GP |
1468 | return 0; |
1469 | } | |
1470 | ||
99b0d4b7 GP |
1471 | static int l2cap_send_srejtail(struct sock *sk) |
1472 | { | |
1473 | struct srej_list *tail; | |
1474 | u16 control; | |
1475 | ||
1476 | control = L2CAP_SUPER_SELECT_REJECT; | |
1477 | control |= L2CAP_CTRL_FINAL; | |
1478 | ||
1479 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1480 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1481 | ||
1482 | l2cap_send_sframe(l2cap_pi(sk), control); | |
1483 | ||
1484 | return 0; | |
1485 | } | |
1486 | ||
1c2acffb GP |
1487 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1488 | { | |
1489 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1490 | struct sk_buff **frag; | |
1491 | int err, sent = 0; | |
1da177e4 LT |
1492 | |
1493 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) { | |
1c2acffb | 1494 | return -EFAULT; |
1da177e4 LT |
1495 | } |
1496 | ||
1497 | sent += count; | |
1498 | len -= count; | |
1499 | ||
1500 | /* Continuation fragments (no L2CAP header) */ | |
1501 | frag = &skb_shinfo(skb)->frag_list; | |
1502 | while (len) { | |
1503 | count = min_t(unsigned int, conn->mtu, len); | |
1504 | ||
1505 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1506 | if (!*frag) | |
1c2acffb GP |
1507 | return -EFAULT; |
1508 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) | |
1509 | return -EFAULT; | |
1da177e4 LT |
1510 | |
1511 | sent += count; | |
1512 | len -= count; | |
1513 | ||
1514 | frag = &(*frag)->next; | |
1515 | } | |
1da177e4 LT |
1516 | |
1517 | return sent; | |
1c2acffb | 1518 | } |
1da177e4 | 1519 | |
1c2acffb GP |
1520 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1521 | { | |
1522 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1523 | struct sk_buff *skb; | |
1524 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1525 | struct l2cap_hdr *lh; | |
1526 | ||
1527 | BT_DBG("sk %p len %d", sk, (int)len); | |
1528 | ||
1529 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1530 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1531 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1532 | if (!skb) | |
1533 | return ERR_PTR(-ENOMEM); | |
1534 | ||
1535 | /* Create L2CAP header */ | |
1536 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1537 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1538 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1539 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1540 | ||
1541 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1542 | if (unlikely(err < 0)) { | |
1543 | kfree_skb(skb); | |
1544 | return ERR_PTR(err); | |
1545 | } | |
1546 | return skb; | |
1547 | } | |
1548 | ||
1549 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) | |
1550 | { | |
1551 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1552 | struct sk_buff *skb; | |
1553 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1554 | struct l2cap_hdr *lh; | |
1555 | ||
1556 | BT_DBG("sk %p len %d", sk, (int)len); | |
1557 | ||
1558 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1559 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1560 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1561 | if (!skb) | |
1562 | return ERR_PTR(-ENOMEM); | |
1563 | ||
1564 | /* Create L2CAP header */ | |
1565 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1566 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1567 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1568 | ||
1569 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1570 | if (unlikely(err < 0)) { | |
1571 | kfree_skb(skb); | |
1572 | return ERR_PTR(err); | |
1573 | } | |
1574 | return skb; | |
1575 | } | |
1576 | ||
6840ed07 | 1577 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1578 | { |
1579 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1580 | struct sk_buff *skb; | |
1581 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1582 | struct l2cap_hdr *lh; | |
1583 | ||
1584 | BT_DBG("sk %p len %d", sk, (int)len); | |
1585 | ||
0ee0d208 GP |
1586 | if (!conn) |
1587 | return ERR_PTR(-ENOTCONN); | |
1588 | ||
c74e560c GP |
1589 | if (sdulen) |
1590 | hlen += 2; | |
1591 | ||
fcc203c3 GP |
1592 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1593 | hlen += 2; | |
1594 | ||
1c2acffb GP |
1595 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1596 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1597 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1598 | if (!skb) | |
1599 | return ERR_PTR(-ENOMEM); | |
1600 | ||
1601 | /* Create L2CAP header */ | |
1602 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1603 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1604 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1605 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1606 | if (sdulen) |
1607 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
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 | } | |
e90bac06 | 1614 | |
fcc203c3 GP |
1615 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1616 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1617 | ||
e90bac06 | 1618 | bt_cb(skb)->retries = 0; |
1c2acffb | 1619 | return skb; |
1da177e4 LT |
1620 | } |
1621 | ||
c74e560c GP |
1622 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1623 | { | |
1624 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1625 | struct sk_buff *skb; | |
1626 | struct sk_buff_head sar_queue; | |
1627 | u16 control; | |
1628 | size_t size = 0; | |
1629 | ||
1630 | __skb_queue_head_init(&sar_queue); | |
1631 | control = L2CAP_SDU_START; | |
1c762159 | 1632 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1633 | if (IS_ERR(skb)) |
1634 | return PTR_ERR(skb); | |
1635 | ||
1636 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1637 | len -= pi->remote_mps; |
1638 | size += pi->remote_mps; | |
c74e560c GP |
1639 | control = 0; |
1640 | ||
1641 | while (len > 0) { | |
1642 | size_t buflen; | |
1643 | ||
1c762159 | 1644 | if (len > pi->remote_mps) { |
c74e560c | 1645 | control |= L2CAP_SDU_CONTINUE; |
1c762159 | 1646 | buflen = pi->remote_mps; |
c74e560c GP |
1647 | } else { |
1648 | control |= L2CAP_SDU_END; | |
1649 | buflen = len; | |
1650 | } | |
1651 | ||
6840ed07 | 1652 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1653 | if (IS_ERR(skb)) { |
1654 | skb_queue_purge(&sar_queue); | |
1655 | return PTR_ERR(skb); | |
1656 | } | |
1657 | ||
1658 | __skb_queue_tail(&sar_queue, skb); | |
1659 | len -= buflen; | |
1660 | size += buflen; | |
1661 | control = 0; | |
1662 | } | |
1663 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1664 | if (sk->sk_send_head == NULL) | |
1665 | sk->sk_send_head = sar_queue.next; | |
1666 | ||
1667 | return size; | |
1668 | } | |
1669 | ||
1da177e4 LT |
1670 | static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1671 | { | |
1672 | struct sock *sk = sock->sk; | |
1c2acffb GP |
1673 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1674 | struct sk_buff *skb; | |
1675 | u16 control; | |
1676 | int err; | |
1da177e4 LT |
1677 | |
1678 | BT_DBG("sock %p, sk %p", sock, sk); | |
1679 | ||
c1cbe4b7 BL |
1680 | err = sock_error(sk); |
1681 | if (err) | |
1682 | return err; | |
1da177e4 LT |
1683 | |
1684 | if (msg->msg_flags & MSG_OOB) | |
1685 | return -EOPNOTSUPP; | |
1686 | ||
1da177e4 LT |
1687 | lock_sock(sk); |
1688 | ||
1c2acffb | 1689 | if (sk->sk_state != BT_CONNECTED) { |
1da177e4 | 1690 | err = -ENOTCONN; |
1c2acffb GP |
1691 | goto done; |
1692 | } | |
1da177e4 | 1693 | |
1c2acffb GP |
1694 | /* Connectionless channel */ |
1695 | if (sk->sk_type == SOCK_DGRAM) { | |
1696 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
477fffb0 DC |
1697 | if (IS_ERR(skb)) |
1698 | err = PTR_ERR(skb); | |
1699 | else | |
1700 | err = l2cap_do_send(sk, skb); | |
1c2acffb GP |
1701 | goto done; |
1702 | } | |
1703 | ||
1704 | switch (pi->mode) { | |
1705 | case L2CAP_MODE_BASIC: | |
c69163e9 GP |
1706 | /* Check outgoing MTU */ |
1707 | if (len > pi->omtu) { | |
1708 | err = -EINVAL; | |
1709 | goto done; | |
1710 | } | |
1711 | ||
1c2acffb GP |
1712 | /* Create a basic PDU */ |
1713 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
1714 | if (IS_ERR(skb)) { | |
1715 | err = PTR_ERR(skb); | |
1716 | goto done; | |
1717 | } | |
1718 | ||
1719 | err = l2cap_do_send(sk, skb); | |
1720 | if (!err) | |
1721 | err = len; | |
1722 | break; | |
1723 | ||
1724 | case L2CAP_MODE_ERTM: | |
6840ed07 | 1725 | case L2CAP_MODE_STREAMING: |
1c2acffb | 1726 | /* Entire SDU fits into one PDU */ |
1c762159 | 1727 | if (len <= pi->remote_mps) { |
1c2acffb | 1728 | control = L2CAP_SDU_UNSEGMENTED; |
6840ed07 | 1729 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1c2acffb GP |
1730 | if (IS_ERR(skb)) { |
1731 | err = PTR_ERR(skb); | |
1732 | goto done; | |
1733 | } | |
c74e560c GP |
1734 | __skb_queue_tail(TX_QUEUE(sk), skb); |
1735 | if (sk->sk_send_head == NULL) | |
1736 | sk->sk_send_head = skb; | |
1c2acffb | 1737 | } else { |
c74e560c GP |
1738 | /* Segment SDU into multiples PDUs */ |
1739 | err = l2cap_sar_segment_sdu(sk, msg, len); | |
1740 | if (err < 0) | |
1741 | goto done; | |
1c2acffb | 1742 | } |
1c2acffb | 1743 | |
6840ed07 GP |
1744 | if (pi->mode == L2CAP_MODE_STREAMING) |
1745 | err = l2cap_streaming_send(sk); | |
1746 | else | |
1747 | err = l2cap_ertm_send(sk); | |
1748 | ||
9e917af1 | 1749 | if (err >= 0) |
1c2acffb GP |
1750 | err = len; |
1751 | break; | |
1752 | ||
1753 | default: | |
1754 | BT_DBG("bad state %1.1x", pi->mode); | |
1755 | err = -EINVAL; | |
1756 | } | |
1757 | ||
1758 | done: | |
1da177e4 LT |
1759 | release_sock(sk); |
1760 | return err; | |
1761 | } | |
1762 | ||
f66dc81f MH |
1763 | static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
1764 | { | |
1765 | struct sock *sk = sock->sk; | |
1766 | ||
1767 | lock_sock(sk); | |
1768 | ||
1769 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1770 | struct l2cap_conn_rsp rsp; | |
1771 | ||
1772 | sk->sk_state = BT_CONFIG; | |
1773 | ||
1774 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1775 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1776 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1777 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1778 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1779 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1780 | ||
1781 | release_sock(sk); | |
1782 | return 0; | |
1783 | } | |
1784 | ||
1785 | release_sock(sk); | |
1786 | ||
1787 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); | |
1788 | } | |
1789 | ||
b7058842 | 1790 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1791 | { |
1792 | struct sock *sk = sock->sk; | |
1793 | struct l2cap_options opts; | |
f29972de | 1794 | int len, err = 0; |
1da177e4 LT |
1795 | u32 opt; |
1796 | ||
1797 | BT_DBG("sk %p", sk); | |
1798 | ||
1799 | lock_sock(sk); | |
1800 | ||
1801 | switch (optname) { | |
1802 | case L2CAP_OPTIONS: | |
0878b666 MH |
1803 | opts.imtu = l2cap_pi(sk)->imtu; |
1804 | opts.omtu = l2cap_pi(sk)->omtu; | |
1805 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1806 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1807 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1808 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1809 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
0878b666 | 1810 | |
1da177e4 LT |
1811 | len = min_t(unsigned int, sizeof(opts), optlen); |
1812 | if (copy_from_user((char *) &opts, optval, len)) { | |
1813 | err = -EFAULT; | |
1814 | break; | |
1815 | } | |
0878b666 | 1816 | |
0041ecfa JPRV |
1817 | l2cap_pi(sk)->mode = opts.mode; |
1818 | switch (l2cap_pi(sk)->mode) { | |
1819 | case L2CAP_MODE_BASIC: | |
1820 | break; | |
1821 | case L2CAP_MODE_ERTM: | |
1822 | case L2CAP_MODE_STREAMING: | |
1823 | if (enable_ertm) | |
1824 | break; | |
1825 | /* fall through */ | |
1826 | default: | |
1827 | err = -EINVAL; | |
1828 | break; | |
1829 | } | |
1830 | ||
c6b03cf9 MH |
1831 | l2cap_pi(sk)->imtu = opts.imtu; |
1832 | l2cap_pi(sk)->omtu = opts.omtu; | |
fcc203c3 | 1833 | l2cap_pi(sk)->fcs = opts.fcs; |
68d7f0ce | 1834 | l2cap_pi(sk)->max_tx = opts.max_tx; |
14b5aa71 | 1835 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; |
1da177e4 LT |
1836 | break; |
1837 | ||
1838 | case L2CAP_LM: | |
1839 | if (get_user(opt, (u32 __user *) optval)) { | |
1840 | err = -EFAULT; | |
1841 | break; | |
1842 | } | |
1843 | ||
2af6b9d5 MH |
1844 | if (opt & L2CAP_LM_AUTH) |
1845 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
1846 | if (opt & L2CAP_LM_ENCRYPT) | |
1847 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
1848 | if (opt & L2CAP_LM_SECURE) | |
1849 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
1850 | ||
1851 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
1852 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
1853 | break; |
1854 | ||
1855 | default: | |
1856 | err = -ENOPROTOOPT; | |
1857 | break; | |
1858 | } | |
1859 | ||
1860 | release_sock(sk); | |
1861 | return err; | |
1862 | } | |
1863 | ||
b7058842 | 1864 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
1865 | { |
1866 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
1867 | struct bt_security sec; |
1868 | int len, err = 0; | |
f66dc81f | 1869 | u32 opt; |
d58daf42 MH |
1870 | |
1871 | BT_DBG("sk %p", sk); | |
1872 | ||
1873 | if (level == SOL_L2CAP) | |
1874 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
1875 | ||
0588d94f MH |
1876 | if (level != SOL_BLUETOOTH) |
1877 | return -ENOPROTOOPT; | |
1878 | ||
d58daf42 MH |
1879 | lock_sock(sk); |
1880 | ||
1881 | switch (optname) { | |
2af6b9d5 | 1882 | case BT_SECURITY: |
bd3c9e25 GP |
1883 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
1884 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
1885 | err = -EINVAL; |
1886 | break; | |
1887 | } | |
1888 | ||
2af6b9d5 MH |
1889 | sec.level = BT_SECURITY_LOW; |
1890 | ||
1891 | len = min_t(unsigned int, sizeof(sec), optlen); | |
1892 | if (copy_from_user((char *) &sec, optval, len)) { | |
1893 | err = -EFAULT; | |
1894 | break; | |
1895 | } | |
1896 | ||
1897 | if (sec.level < BT_SECURITY_LOW || | |
1898 | sec.level > BT_SECURITY_HIGH) { | |
1899 | err = -EINVAL; | |
1900 | break; | |
1901 | } | |
1902 | ||
1903 | l2cap_pi(sk)->sec_level = sec.level; | |
1904 | break; | |
1905 | ||
f66dc81f MH |
1906 | case BT_DEFER_SETUP: |
1907 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
1908 | err = -EINVAL; | |
1909 | break; | |
1910 | } | |
1911 | ||
1912 | if (get_user(opt, (u32 __user *) optval)) { | |
1913 | err = -EFAULT; | |
1914 | break; | |
1915 | } | |
1916 | ||
1917 | bt_sk(sk)->defer_setup = opt; | |
1918 | break; | |
1919 | ||
d58daf42 MH |
1920 | default: |
1921 | err = -ENOPROTOOPT; | |
1922 | break; | |
1923 | } | |
1924 | ||
1925 | release_sock(sk); | |
1926 | return err; | |
1927 | } | |
1928 | ||
1929 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
1930 | { |
1931 | struct sock *sk = sock->sk; | |
1932 | struct l2cap_options opts; | |
1933 | struct l2cap_conninfo cinfo; | |
1934 | int len, err = 0; | |
2af6b9d5 | 1935 | u32 opt; |
1da177e4 LT |
1936 | |
1937 | BT_DBG("sk %p", sk); | |
1938 | ||
1939 | if (get_user(len, optlen)) | |
1940 | return -EFAULT; | |
1941 | ||
1942 | lock_sock(sk); | |
1943 | ||
1944 | switch (optname) { | |
1945 | case L2CAP_OPTIONS: | |
1946 | opts.imtu = l2cap_pi(sk)->imtu; | |
1947 | opts.omtu = l2cap_pi(sk)->omtu; | |
1948 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1949 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1950 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1951 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1952 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
1da177e4 LT |
1953 | |
1954 | len = min_t(unsigned int, len, sizeof(opts)); | |
1955 | if (copy_to_user(optval, (char *) &opts, len)) | |
1956 | err = -EFAULT; | |
1957 | ||
1958 | break; | |
1959 | ||
1960 | case L2CAP_LM: | |
2af6b9d5 MH |
1961 | switch (l2cap_pi(sk)->sec_level) { |
1962 | case BT_SECURITY_LOW: | |
1963 | opt = L2CAP_LM_AUTH; | |
1964 | break; | |
1965 | case BT_SECURITY_MEDIUM: | |
1966 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
1967 | break; | |
1968 | case BT_SECURITY_HIGH: | |
1969 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
1970 | L2CAP_LM_SECURE; | |
1971 | break; | |
1972 | default: | |
1973 | opt = 0; | |
1974 | break; | |
1975 | } | |
1976 | ||
1977 | if (l2cap_pi(sk)->role_switch) | |
1978 | opt |= L2CAP_LM_MASTER; | |
1979 | ||
1980 | if (l2cap_pi(sk)->force_reliable) | |
1981 | opt |= L2CAP_LM_RELIABLE; | |
1982 | ||
1983 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
1984 | err = -EFAULT; |
1985 | break; | |
1986 | ||
1987 | case L2CAP_CONNINFO: | |
f66dc81f MH |
1988 | if (sk->sk_state != BT_CONNECTED && |
1989 | !(sk->sk_state == BT_CONNECT2 && | |
1990 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
1991 | err = -ENOTCONN; |
1992 | break; | |
1993 | } | |
1994 | ||
1995 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
1996 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
1997 | ||
1998 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
1999 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
2000 | err = -EFAULT; | |
2001 | ||
2002 | break; | |
2003 | ||
2004 | default: | |
2005 | err = -ENOPROTOOPT; | |
2006 | break; | |
2007 | } | |
2008 | ||
2009 | release_sock(sk); | |
2010 | return err; | |
2011 | } | |
2012 | ||
d58daf42 MH |
2013 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
2014 | { | |
2015 | struct sock *sk = sock->sk; | |
2af6b9d5 | 2016 | struct bt_security sec; |
d58daf42 MH |
2017 | int len, err = 0; |
2018 | ||
2019 | BT_DBG("sk %p", sk); | |
2020 | ||
2021 | if (level == SOL_L2CAP) | |
2022 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
2023 | ||
0588d94f MH |
2024 | if (level != SOL_BLUETOOTH) |
2025 | return -ENOPROTOOPT; | |
2026 | ||
d58daf42 MH |
2027 | if (get_user(len, optlen)) |
2028 | return -EFAULT; | |
2029 | ||
2030 | lock_sock(sk); | |
2031 | ||
2032 | switch (optname) { | |
2af6b9d5 | 2033 | case BT_SECURITY: |
bd3c9e25 GP |
2034 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
2035 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
2036 | err = -EINVAL; |
2037 | break; | |
2038 | } | |
2039 | ||
2af6b9d5 MH |
2040 | sec.level = l2cap_pi(sk)->sec_level; |
2041 | ||
2042 | len = min_t(unsigned int, len, sizeof(sec)); | |
2043 | if (copy_to_user(optval, (char *) &sec, len)) | |
2044 | err = -EFAULT; | |
2045 | ||
2046 | break; | |
2047 | ||
f66dc81f MH |
2048 | case BT_DEFER_SETUP: |
2049 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
2050 | err = -EINVAL; | |
2051 | break; | |
2052 | } | |
2053 | ||
2054 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
2055 | err = -EFAULT; | |
2056 | ||
2057 | break; | |
2058 | ||
d58daf42 MH |
2059 | default: |
2060 | err = -ENOPROTOOPT; | |
2061 | break; | |
2062 | } | |
2063 | ||
2064 | release_sock(sk); | |
2065 | return err; | |
2066 | } | |
2067 | ||
1da177e4 LT |
2068 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
2069 | { | |
2070 | struct sock *sk = sock->sk; | |
2071 | int err = 0; | |
2072 | ||
2073 | BT_DBG("sock %p, sk %p", sock, sk); | |
2074 | ||
2075 | if (!sk) | |
2076 | return 0; | |
2077 | ||
2078 | lock_sock(sk); | |
2079 | if (!sk->sk_shutdown) { | |
2080 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2081 | l2cap_sock_clear_timer(sk); | |
2082 | __l2cap_sock_close(sk, 0); | |
2083 | ||
2084 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
2085 | err = bt_sock_wait_state(sk, BT_CLOSED, |
2086 | sk->sk_lingertime); | |
1da177e4 LT |
2087 | } |
2088 | release_sock(sk); | |
2089 | return err; | |
2090 | } | |
2091 | ||
2092 | static int l2cap_sock_release(struct socket *sock) | |
2093 | { | |
2094 | struct sock *sk = sock->sk; | |
2095 | int err; | |
2096 | ||
2097 | BT_DBG("sock %p, sk %p", sock, sk); | |
2098 | ||
2099 | if (!sk) | |
2100 | return 0; | |
2101 | ||
2102 | err = l2cap_sock_shutdown(sock, 2); | |
2103 | ||
2104 | sock_orphan(sk); | |
2105 | l2cap_sock_kill(sk); | |
2106 | return err; | |
2107 | } | |
2108 | ||
1da177e4 LT |
2109 | static void l2cap_chan_ready(struct sock *sk) |
2110 | { | |
2111 | struct sock *parent = bt_sk(sk)->parent; | |
2112 | ||
2113 | BT_DBG("sk %p, parent %p", sk, parent); | |
2114 | ||
2115 | l2cap_pi(sk)->conf_state = 0; | |
2116 | l2cap_sock_clear_timer(sk); | |
2117 | ||
2118 | if (!parent) { | |
2119 | /* Outgoing channel. | |
2120 | * Wake up socket sleeping on connect. | |
2121 | */ | |
2122 | sk->sk_state = BT_CONNECTED; | |
2123 | sk->sk_state_change(sk); | |
2124 | } else { | |
2125 | /* Incoming channel. | |
2126 | * Wake up socket sleeping on accept. | |
2127 | */ | |
2128 | parent->sk_data_ready(parent, 0); | |
2129 | } | |
2130 | } | |
2131 | ||
2132 | /* Copy frame to all raw sockets on that connection */ | |
2133 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2134 | { | |
2135 | struct l2cap_chan_list *l = &conn->chan_list; | |
2136 | struct sk_buff *nskb; | |
af05b30b | 2137 | struct sock *sk; |
1da177e4 LT |
2138 | |
2139 | BT_DBG("conn %p", conn); | |
2140 | ||
2141 | read_lock(&l->lock); | |
2142 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2143 | if (sk->sk_type != SOCK_RAW) | |
2144 | continue; | |
2145 | ||
2146 | /* Don't send frame to the socket it came from */ | |
2147 | if (skb->sk == sk) | |
2148 | continue; | |
af05b30b GP |
2149 | nskb = skb_clone(skb, GFP_ATOMIC); |
2150 | if (!nskb) | |
1da177e4 LT |
2151 | continue; |
2152 | ||
2153 | if (sock_queue_rcv_skb(sk, nskb)) | |
2154 | kfree_skb(nskb); | |
2155 | } | |
2156 | read_unlock(&l->lock); | |
2157 | } | |
2158 | ||
2159 | /* ---- L2CAP signalling commands ---- */ | |
2160 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2161 | u8 code, u8 ident, u16 dlen, void *data) | |
2162 | { | |
2163 | struct sk_buff *skb, **frag; | |
2164 | struct l2cap_cmd_hdr *cmd; | |
2165 | struct l2cap_hdr *lh; | |
2166 | int len, count; | |
2167 | ||
af05b30b GP |
2168 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2169 | conn, code, ident, dlen); | |
1da177e4 LT |
2170 | |
2171 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2172 | count = min_t(unsigned int, conn->mtu, len); | |
2173 | ||
2174 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2175 | if (!skb) | |
2176 | return NULL; | |
2177 | ||
2178 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2179 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 2180 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2181 | |
2182 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2183 | cmd->code = code; | |
2184 | cmd->ident = ident; | |
aca3192c | 2185 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2186 | |
2187 | if (dlen) { | |
2188 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2189 | memcpy(skb_put(skb, count), data, count); | |
2190 | data += count; | |
2191 | } | |
2192 | ||
2193 | len -= skb->len; | |
2194 | ||
2195 | /* Continuation fragments (no L2CAP header) */ | |
2196 | frag = &skb_shinfo(skb)->frag_list; | |
2197 | while (len) { | |
2198 | count = min_t(unsigned int, conn->mtu, len); | |
2199 | ||
2200 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2201 | if (!*frag) | |
2202 | goto fail; | |
2203 | ||
2204 | memcpy(skb_put(*frag, count), data, count); | |
2205 | ||
2206 | len -= count; | |
2207 | data += count; | |
2208 | ||
2209 | frag = &(*frag)->next; | |
2210 | } | |
2211 | ||
2212 | return skb; | |
2213 | ||
2214 | fail: | |
2215 | kfree_skb(skb); | |
2216 | return NULL; | |
2217 | } | |
2218 | ||
2219 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2220 | { | |
2221 | struct l2cap_conf_opt *opt = *ptr; | |
2222 | int len; | |
2223 | ||
2224 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2225 | *ptr += len; | |
2226 | ||
2227 | *type = opt->type; | |
2228 | *olen = opt->len; | |
2229 | ||
2230 | switch (opt->len) { | |
2231 | case 1: | |
2232 | *val = *((u8 *) opt->val); | |
2233 | break; | |
2234 | ||
2235 | case 2: | |
861d6882 | 2236 | *val = __le16_to_cpu(*((__le16 *) opt->val)); |
1da177e4 LT |
2237 | break; |
2238 | ||
2239 | case 4: | |
861d6882 | 2240 | *val = __le32_to_cpu(*((__le32 *) opt->val)); |
1da177e4 LT |
2241 | break; |
2242 | ||
2243 | default: | |
2244 | *val = (unsigned long) opt->val; | |
2245 | break; | |
2246 | } | |
2247 | ||
2248 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2249 | return len; | |
2250 | } | |
2251 | ||
1da177e4 LT |
2252 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2253 | { | |
2254 | struct l2cap_conf_opt *opt = *ptr; | |
2255 | ||
2256 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2257 | ||
2258 | opt->type = type; | |
2259 | opt->len = len; | |
2260 | ||
2261 | switch (len) { | |
2262 | case 1: | |
2263 | *((u8 *) opt->val) = val; | |
2264 | break; | |
2265 | ||
2266 | case 2: | |
8e036fc3 | 2267 | *((__le16 *) opt->val) = cpu_to_le16(val); |
1da177e4 LT |
2268 | break; |
2269 | ||
2270 | case 4: | |
8e036fc3 | 2271 | *((__le32 *) opt->val) = cpu_to_le32(val); |
1da177e4 LT |
2272 | break; |
2273 | ||
2274 | default: | |
2275 | memcpy(opt->val, (void *) val, len); | |
2276 | break; | |
2277 | } | |
2278 | ||
2279 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2280 | } | |
2281 | ||
c1b4f43b GP |
2282 | static void l2cap_ack_timeout(unsigned long arg) |
2283 | { | |
2284 | struct sock *sk = (void *) arg; | |
2285 | ||
2286 | bh_lock_sock(sk); | |
2287 | l2cap_send_ack(l2cap_pi(sk)); | |
2288 | bh_unlock_sock(sk); | |
2289 | } | |
2290 | ||
0565c1c2 GP |
2291 | static inline void l2cap_ertm_init(struct sock *sk) |
2292 | { | |
2293 | l2cap_pi(sk)->expected_ack_seq = 0; | |
2294 | l2cap_pi(sk)->unacked_frames = 0; | |
2295 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 2296 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 2297 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
2298 | |
2299 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
2300 | l2cap_retrans_timeout, (unsigned long) sk); | |
2301 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
2302 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
2303 | setup_timer(&l2cap_pi(sk)->ack_timer, |
2304 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
2305 | |
2306 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
2307 | } | |
2308 | ||
f2fcfcd6 GP |
2309 | static int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
2310 | { | |
2311 | u32 local_feat_mask = l2cap_feat_mask; | |
2312 | if (enable_ertm) | |
6840ed07 | 2313 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
f2fcfcd6 GP |
2314 | |
2315 | switch (mode) { | |
2316 | case L2CAP_MODE_ERTM: | |
2317 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
2318 | case L2CAP_MODE_STREAMING: | |
2319 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
2320 | default: | |
2321 | return 0x00; | |
2322 | } | |
2323 | } | |
2324 | ||
2325 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) | |
2326 | { | |
2327 | switch (mode) { | |
2328 | case L2CAP_MODE_STREAMING: | |
2329 | case L2CAP_MODE_ERTM: | |
2330 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2331 | return mode; | |
2332 | /* fall through */ | |
2333 | default: | |
2334 | return L2CAP_MODE_BASIC; | |
2335 | } | |
2336 | } | |
2337 | ||
1da177e4 LT |
2338 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2339 | { | |
2340 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2341 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 2342 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
2343 | void *ptr = req->data; |
2344 | ||
2345 | BT_DBG("sk %p", sk); | |
2346 | ||
f2fcfcd6 GP |
2347 | if (pi->num_conf_req || pi->num_conf_rsp) |
2348 | goto done; | |
2349 | ||
2350 | switch (pi->mode) { | |
2351 | case L2CAP_MODE_STREAMING: | |
2352 | case L2CAP_MODE_ERTM: | |
2353 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; | |
22121fc9 GP |
2354 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) |
2355 | l2cap_send_disconn_req(pi->conn, sk); | |
f2fcfcd6 GP |
2356 | break; |
2357 | default: | |
2358 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2359 | break; | |
2360 | } | |
2361 | ||
2362 | done: | |
65c7c491 MH |
2363 | switch (pi->mode) { |
2364 | case L2CAP_MODE_BASIC: | |
2365 | if (pi->imtu != L2CAP_DEFAULT_MTU) | |
2366 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
2367 | break; | |
2368 | ||
2369 | case L2CAP_MODE_ERTM: | |
2370 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 2371 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 2372 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
2373 | rfc.retrans_timeout = 0; |
2374 | rfc.monitor_timeout = 0; | |
c74e560c | 2375 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2376 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2377 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 GP |
2378 | |
2379 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2380 | sizeof(rfc), (unsigned long) &rfc); | |
fcc203c3 GP |
2381 | |
2382 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) | |
2383 | break; | |
2384 | ||
2385 | if (pi->fcs == L2CAP_FCS_NONE || | |
2386 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2387 | pi->fcs = L2CAP_FCS_NONE; | |
2388 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2389 | } | |
f2fcfcd6 GP |
2390 | break; |
2391 | ||
2392 | case L2CAP_MODE_STREAMING: | |
2393 | rfc.mode = L2CAP_MODE_STREAMING; | |
2394 | rfc.txwin_size = 0; | |
2395 | rfc.max_transmit = 0; | |
2396 | rfc.retrans_timeout = 0; | |
2397 | rfc.monitor_timeout = 0; | |
c74e560c | 2398 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2399 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2400 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 MH |
2401 | |
2402 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2403 | sizeof(rfc), (unsigned long) &rfc); | |
fcc203c3 GP |
2404 | |
2405 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) | |
2406 | break; | |
2407 | ||
2408 | if (pi->fcs == L2CAP_FCS_NONE || | |
2409 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2410 | pi->fcs = L2CAP_FCS_NONE; | |
2411 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2412 | } | |
65c7c491 MH |
2413 | break; |
2414 | } | |
1da177e4 LT |
2415 | |
2416 | /* FIXME: Need actual value of the flush timeout */ | |
2417 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
2418 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
2419 | ||
aca3192c YH |
2420 | req->dcid = cpu_to_le16(pi->dcid); |
2421 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
2422 | |
2423 | return ptr - data; | |
2424 | } | |
2425 | ||
5dee9e7c | 2426 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
2427 | { |
2428 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
2429 | struct l2cap_conf_rsp *rsp = data; |
2430 | void *ptr = rsp->data; | |
2431 | void *req = pi->conf_req; | |
2432 | int len = pi->conf_len; | |
2433 | int type, hint, olen; | |
2434 | unsigned long val; | |
6464f35f | 2435 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2436 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2437 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2438 | |
5dee9e7c | 2439 | BT_DBG("sk %p", sk); |
820ae1b8 | 2440 | |
5dee9e7c MH |
2441 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2442 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2443 | |
589d2746 | 2444 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2445 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2446 | |
2447 | switch (type) { | |
2448 | case L2CAP_CONF_MTU: | |
861d6882 | 2449 | mtu = val; |
5dee9e7c MH |
2450 | break; |
2451 | ||
2452 | case L2CAP_CONF_FLUSH_TO: | |
2453 | pi->flush_to = val; | |
2454 | break; | |
2455 | ||
2456 | case L2CAP_CONF_QOS: | |
2457 | break; | |
2458 | ||
6464f35f MH |
2459 | case L2CAP_CONF_RFC: |
2460 | if (olen == sizeof(rfc)) | |
2461 | memcpy(&rfc, (void *) val, olen); | |
2462 | break; | |
2463 | ||
fcc203c3 GP |
2464 | case L2CAP_CONF_FCS: |
2465 | if (val == L2CAP_FCS_NONE) | |
2466 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
2467 | ||
2468 | break; | |
2469 | ||
5dee9e7c MH |
2470 | default: |
2471 | if (hint) | |
2472 | break; | |
2473 | ||
2474 | result = L2CAP_CONF_UNKNOWN; | |
2475 | *((u8 *) ptr++) = type; | |
2476 | break; | |
2477 | } | |
2478 | } | |
2479 | ||
f2fcfcd6 GP |
2480 | if (pi->num_conf_rsp || pi->num_conf_req) |
2481 | goto done; | |
2482 | ||
2483 | switch (pi->mode) { | |
2484 | case L2CAP_MODE_STREAMING: | |
2485 | case L2CAP_MODE_ERTM: | |
2486 | pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; | |
2487 | if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask)) | |
2488 | return -ECONNREFUSED; | |
2489 | break; | |
2490 | default: | |
2491 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2492 | break; | |
2493 | } | |
2494 | ||
2495 | done: | |
2496 | if (pi->mode != rfc.mode) { | |
2497 | result = L2CAP_CONF_UNACCEPT; | |
2498 | rfc.mode = pi->mode; | |
2499 | ||
2500 | if (pi->num_conf_rsp == 1) | |
2501 | return -ECONNREFUSED; | |
2502 | ||
2503 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2504 | sizeof(rfc), (unsigned long) &rfc); | |
2505 | } | |
2506 | ||
2507 | ||
5dee9e7c MH |
2508 | if (result == L2CAP_CONF_SUCCESS) { |
2509 | /* Configure output options and let the other side know | |
2510 | * which ones we don't like. */ | |
2511 | ||
f2fcfcd6 GP |
2512 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2513 | result = L2CAP_CONF_UNACCEPT; | |
2514 | else { | |
2515 | pi->omtu = mtu; | |
2516 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
2517 | } | |
2518 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 2519 | |
f2fcfcd6 GP |
2520 | switch (rfc.mode) { |
2521 | case L2CAP_MODE_BASIC: | |
2522 | pi->fcs = L2CAP_FCS_NONE; | |
2523 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
2524 | break; | |
2525 | ||
2526 | case L2CAP_MODE_ERTM: | |
2527 | pi->remote_tx_win = rfc.txwin_size; | |
2528 | pi->remote_max_tx = rfc.max_transmit; | |
1c762159 GP |
2529 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2530 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2531 | ||
2532 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 2533 | |
10467e9e GP |
2534 | rfc.retrans_timeout = |
2535 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2536 | rfc.monitor_timeout = | |
2537 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
2538 | |
2539 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2540 | |
2541 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2542 | sizeof(rfc), (unsigned long) &rfc); | |
2543 | ||
f2fcfcd6 GP |
2544 | break; |
2545 | ||
2546 | case L2CAP_MODE_STREAMING: | |
1c762159 GP |
2547 | if (rfc.max_pdu_size > pi->conn->mtu - 10) |
2548 | rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); | |
2549 | ||
2550 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2551 | |
2552 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2553 | |
2554 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2555 | sizeof(rfc), (unsigned long) &rfc); | |
2556 | ||
f2fcfcd6 GP |
2557 | break; |
2558 | ||
2559 | default: | |
5dee9e7c | 2560 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2561 | |
6464f35f | 2562 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
2563 | rfc.mode = pi->mode; |
2564 | } | |
6464f35f | 2565 | |
f2fcfcd6 GP |
2566 | if (result == L2CAP_CONF_SUCCESS) |
2567 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
2568 | } | |
5dee9e7c MH |
2569 | rsp->scid = cpu_to_le16(pi->dcid); |
2570 | rsp->result = cpu_to_le16(result); | |
2571 | rsp->flags = cpu_to_le16(0x0000); | |
2572 | ||
2573 | return ptr - data; | |
1da177e4 LT |
2574 | } |
2575 | ||
f2fcfcd6 GP |
2576 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2577 | { | |
2578 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2579 | struct l2cap_conf_req *req = data; | |
2580 | void *ptr = req->data; | |
2581 | int type, olen; | |
2582 | unsigned long val; | |
2583 | struct l2cap_conf_rfc rfc; | |
2584 | ||
2585 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
2586 | ||
2587 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2588 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2589 | ||
2590 | switch (type) { | |
2591 | case L2CAP_CONF_MTU: | |
2592 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2593 | *result = L2CAP_CONF_UNACCEPT; | |
2594 | pi->omtu = L2CAP_DEFAULT_MIN_MTU; | |
2595 | } else | |
2596 | pi->omtu = val; | |
2597 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
2598 | break; | |
2599 | ||
2600 | case L2CAP_CONF_FLUSH_TO: | |
2601 | pi->flush_to = val; | |
2602 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
2603 | 2, pi->flush_to); | |
2604 | break; | |
2605 | ||
2606 | case L2CAP_CONF_RFC: | |
2607 | if (olen == sizeof(rfc)) | |
2608 | memcpy(&rfc, (void *)val, olen); | |
2609 | ||
2610 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
2611 | rfc.mode != pi->mode) | |
2612 | return -ECONNREFUSED; | |
2613 | ||
2614 | pi->mode = rfc.mode; | |
2615 | pi->fcs = 0; | |
2616 | ||
2617 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2618 | sizeof(rfc), (unsigned long) &rfc); | |
2619 | break; | |
2620 | } | |
2621 | } | |
2622 | ||
2623 | if (*result == L2CAP_CONF_SUCCESS) { | |
2624 | switch (rfc.mode) { | |
2625 | case L2CAP_MODE_ERTM: | |
2626 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2627 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2628 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 2629 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2630 | break; |
2631 | case L2CAP_MODE_STREAMING: | |
1c762159 | 2632 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2633 | } |
2634 | } | |
2635 | ||
2636 | req->dcid = cpu_to_le16(pi->dcid); | |
2637 | req->flags = cpu_to_le16(0x0000); | |
2638 | ||
2639 | return ptr - data; | |
2640 | } | |
2641 | ||
5dee9e7c | 2642 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
2643 | { |
2644 | struct l2cap_conf_rsp *rsp = data; | |
2645 | void *ptr = rsp->data; | |
1da177e4 | 2646 | |
5dee9e7c | 2647 | BT_DBG("sk %p", sk); |
1da177e4 | 2648 | |
aca3192c | 2649 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 2650 | rsp->result = cpu_to_le16(result); |
aca3192c | 2651 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2652 | |
2653 | return ptr - data; | |
2654 | } | |
2655 | ||
7b1c0049 GP |
2656 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
2657 | { | |
2658 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2659 | int type, olen; | |
2660 | unsigned long val; | |
2661 | struct l2cap_conf_rfc rfc; | |
2662 | ||
2663 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
2664 | ||
2665 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
2666 | return; | |
2667 | ||
2668 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2669 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2670 | ||
2671 | switch (type) { | |
2672 | case L2CAP_CONF_RFC: | |
2673 | if (olen == sizeof(rfc)) | |
2674 | memcpy(&rfc, (void *)val, olen); | |
2675 | goto done; | |
2676 | } | |
2677 | } | |
2678 | ||
2679 | done: | |
2680 | switch (rfc.mode) { | |
2681 | case L2CAP_MODE_ERTM: | |
2682 | pi->remote_tx_win = rfc.txwin_size; | |
10467e9e GP |
2683 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2684 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2685 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2686 | break; | |
2687 | case L2CAP_MODE_STREAMING: | |
2688 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2689 | } | |
2690 | } | |
2691 | ||
4e8402a3 MH |
2692 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2693 | { | |
2694 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2695 | ||
2696 | if (rej->reason != 0x0000) | |
2697 | return 0; | |
2698 | ||
2699 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2700 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2701 | del_timer(&conn->info_timer); |
984947dc MH |
2702 | |
2703 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2704 | conn->info_ident = 0; |
984947dc | 2705 | |
4e8402a3 MH |
2706 | l2cap_conn_start(conn); |
2707 | } | |
2708 | ||
2709 | return 0; | |
2710 | } | |
2711 | ||
1da177e4 LT |
2712 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2713 | { | |
2714 | struct l2cap_chan_list *list = &conn->chan_list; | |
2715 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
2716 | struct l2cap_conn_rsp rsp; | |
2717 | struct sock *sk, *parent; | |
e7c29cb1 | 2718 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2719 | |
2720 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2721 | __le16 psm = req->psm; |
1da177e4 LT |
2722 | |
2723 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2724 | ||
2725 | /* Check if we have socket listening on psm */ | |
2726 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2727 | if (!parent) { | |
2728 | result = L2CAP_CR_BAD_PSM; | |
2729 | goto sendresp; | |
2730 | } | |
2731 | ||
e7c29cb1 MH |
2732 | /* Check if the ACL is secure enough (if not SDP) */ |
2733 | if (psm != cpu_to_le16(0x0001) && | |
2734 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2735 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2736 | result = L2CAP_CR_SEC_BLOCK; |
2737 | goto response; | |
2738 | } | |
2739 | ||
1da177e4 LT |
2740 | result = L2CAP_CR_NO_MEM; |
2741 | ||
2742 | /* Check for backlog size */ | |
2743 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2744 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2745 | goto response; |
2746 | } | |
2747 | ||
3b1e0a65 | 2748 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2749 | if (!sk) |
2750 | goto response; | |
2751 | ||
fd1278d7 | 2752 | write_lock_bh(&list->lock); |
1da177e4 LT |
2753 | |
2754 | /* Check if we already have channel with that dcid */ | |
2755 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2756 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2757 | sock_set_flag(sk, SOCK_ZAPPED); |
2758 | l2cap_sock_kill(sk); | |
2759 | goto response; | |
2760 | } | |
2761 | ||
2762 | hci_conn_hold(conn->hcon); | |
2763 | ||
2764 | l2cap_sock_init(sk, parent); | |
2765 | bacpy(&bt_sk(sk)->src, conn->src); | |
2766 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2767 | l2cap_pi(sk)->psm = psm; | |
2768 | l2cap_pi(sk)->dcid = scid; | |
2769 | ||
2770 | __l2cap_chan_add(conn, sk, parent); | |
2771 | dcid = l2cap_pi(sk)->scid; | |
2772 | ||
2773 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2774 | ||
1da177e4 LT |
2775 | l2cap_pi(sk)->ident = cmd->ident; |
2776 | ||
984947dc | 2777 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2778 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2779 | if (bt_sk(sk)->defer_setup) { |
2780 | sk->sk_state = BT_CONNECT2; | |
2781 | result = L2CAP_CR_PEND; | |
2782 | status = L2CAP_CS_AUTHOR_PEND; | |
2783 | parent->sk_data_ready(parent, 0); | |
2784 | } else { | |
2785 | sk->sk_state = BT_CONFIG; | |
2786 | result = L2CAP_CR_SUCCESS; | |
2787 | status = L2CAP_CS_NO_INFO; | |
2788 | } | |
79d554a6 MH |
2789 | } else { |
2790 | sk->sk_state = BT_CONNECT2; | |
2791 | result = L2CAP_CR_PEND; | |
2792 | status = L2CAP_CS_AUTHEN_PEND; | |
2793 | } | |
2794 | } else { | |
2795 | sk->sk_state = BT_CONNECT2; | |
2796 | result = L2CAP_CR_PEND; | |
2797 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2798 | } |
2799 | ||
fd1278d7 | 2800 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2801 | |
2802 | response: | |
2803 | bh_unlock_sock(parent); | |
2804 | ||
2805 | sendresp: | |
aca3192c YH |
2806 | rsp.scid = cpu_to_le16(scid); |
2807 | rsp.dcid = cpu_to_le16(dcid); | |
2808 | rsp.result = cpu_to_le16(result); | |
2809 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2810 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2811 | |
2812 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2813 | struct l2cap_info_req info; | |
2814 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2815 | ||
2816 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2817 | conn->info_ident = l2cap_get_ident(conn); | |
2818 | ||
2819 | mod_timer(&conn->info_timer, jiffies + | |
2820 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2821 | ||
2822 | l2cap_send_cmd(conn, conn->info_ident, | |
2823 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2824 | } | |
2825 | ||
1da177e4 LT |
2826 | return 0; |
2827 | } | |
2828 | ||
2829 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2830 | { | |
2831 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2832 | u16 scid, dcid, result, status; | |
2833 | struct sock *sk; | |
2834 | u8 req[128]; | |
2835 | ||
2836 | scid = __le16_to_cpu(rsp->scid); | |
2837 | dcid = __le16_to_cpu(rsp->dcid); | |
2838 | result = __le16_to_cpu(rsp->result); | |
2839 | status = __le16_to_cpu(rsp->status); | |
2840 | ||
2841 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2842 | ||
2843 | if (scid) { | |
af05b30b GP |
2844 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2845 | if (!sk) | |
1da177e4 LT |
2846 | return 0; |
2847 | } else { | |
af05b30b GP |
2848 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2849 | if (!sk) | |
1da177e4 LT |
2850 | return 0; |
2851 | } | |
2852 | ||
2853 | switch (result) { | |
2854 | case L2CAP_CR_SUCCESS: | |
2855 | sk->sk_state = BT_CONFIG; | |
2856 | l2cap_pi(sk)->ident = 0; | |
2857 | l2cap_pi(sk)->dcid = dcid; | |
2858 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2859 | ||
6a8d3010 MH |
2860 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2861 | ||
1da177e4 LT |
2862 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2863 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 2864 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2865 | break; |
2866 | ||
2867 | case L2CAP_CR_PEND: | |
6a8d3010 | 2868 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2869 | break; |
2870 | ||
2871 | default: | |
2872 | l2cap_chan_del(sk, ECONNREFUSED); | |
2873 | break; | |
2874 | } | |
2875 | ||
2876 | bh_unlock_sock(sk); | |
2877 | return 0; | |
2878 | } | |
2879 | ||
88219a0f | 2880 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2881 | { |
2882 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2883 | u16 dcid, flags; | |
2884 | u8 rsp[64]; | |
2885 | struct sock *sk; | |
5dee9e7c | 2886 | int len; |
1da177e4 LT |
2887 | |
2888 | dcid = __le16_to_cpu(req->dcid); | |
2889 | flags = __le16_to_cpu(req->flags); | |
2890 | ||
2891 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2892 | ||
af05b30b GP |
2893 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2894 | if (!sk) | |
1da177e4 LT |
2895 | return -ENOENT; |
2896 | ||
354f60a9 MH |
2897 | if (sk->sk_state == BT_DISCONN) |
2898 | goto unlock; | |
2899 | ||
5dee9e7c | 2900 | /* Reject if config buffer is too small. */ |
88219a0f | 2901 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2902 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2903 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2904 | l2cap_build_conf_rsp(sk, rsp, | |
2905 | L2CAP_CONF_REJECT, flags), rsp); | |
2906 | goto unlock; | |
2907 | } | |
2908 | ||
2909 | /* Store config. */ | |
2910 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2911 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2912 | |
2913 | if (flags & 0x0001) { | |
2914 | /* Incomplete config. Send empty response. */ | |
2915 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2916 | l2cap_build_conf_rsp(sk, rsp, |
2917 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2918 | goto unlock; |
2919 | } | |
2920 | ||
2921 | /* Complete config. */ | |
5dee9e7c | 2922 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 2923 | if (len < 0) { |
22121fc9 | 2924 | l2cap_send_disconn_req(conn, sk); |
1da177e4 | 2925 | goto unlock; |
f2fcfcd6 | 2926 | } |
1da177e4 | 2927 | |
5dee9e7c | 2928 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 2929 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 2930 | |
5dee9e7c MH |
2931 | /* Reset config buffer. */ |
2932 | l2cap_pi(sk)->conf_len = 0; | |
2933 | ||
876d9484 MH |
2934 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2935 | goto unlock; | |
2936 | ||
1da177e4 | 2937 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
f64f9e71 JP |
2938 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
2939 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
2940 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
2941 | ||
1da177e4 | 2942 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2943 | |
0565c1c2 GP |
2944 | l2cap_pi(sk)->next_tx_seq = 0; |
2945 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 2946 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2947 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2948 | l2cap_ertm_init(sk); | |
2949 | ||
1da177e4 | 2950 | l2cap_chan_ready(sk); |
876d9484 MH |
2951 | goto unlock; |
2952 | } | |
2953 | ||
2954 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2955 | u8 buf[64]; |
1da177e4 | 2956 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 2957 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 2958 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2959 | } |
2960 | ||
2961 | unlock: | |
2962 | bh_unlock_sock(sk); | |
2963 | return 0; | |
2964 | } | |
2965 | ||
2966 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2967 | { | |
2968 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2969 | u16 scid, flags, result; | |
2970 | struct sock *sk; | |
7b1c0049 | 2971 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2972 | |
2973 | scid = __le16_to_cpu(rsp->scid); | |
2974 | flags = __le16_to_cpu(rsp->flags); | |
2975 | result = __le16_to_cpu(rsp->result); | |
2976 | ||
af05b30b GP |
2977 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2978 | scid, flags, result); | |
1da177e4 | 2979 | |
af05b30b GP |
2980 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2981 | if (!sk) | |
1da177e4 LT |
2982 | return 0; |
2983 | ||
2984 | switch (result) { | |
2985 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2986 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2987 | break; |
2988 | ||
2989 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 2990 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2991 | char req[64]; |
2992 | ||
c2c77ec8 AE |
2993 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
2994 | l2cap_send_disconn_req(conn, sk); | |
2995 | goto done; | |
2996 | } | |
2997 | ||
f2fcfcd6 GP |
2998 | /* throw out any old stored conf requests */ |
2999 | result = L2CAP_CONF_SUCCESS; | |
3000 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
3001 | len, req, &result); | |
3002 | if (len < 0) { | |
22121fc9 | 3003 | l2cap_send_disconn_req(conn, sk); |
f2fcfcd6 GP |
3004 | goto done; |
3005 | } | |
3006 | ||
3007 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
3008 | L2CAP_CONF_REQ, len, req); | |
3009 | l2cap_pi(sk)->num_conf_req++; | |
3010 | if (result != L2CAP_CONF_SUCCESS) | |
3011 | goto done; | |
3012 | break; | |
1da177e4 LT |
3013 | } |
3014 | ||
8e87d142 | 3015 | default: |
1da177e4 | 3016 | sk->sk_state = BT_DISCONN; |
b1235d79 | 3017 | sk->sk_err = ECONNRESET; |
1da177e4 | 3018 | l2cap_sock_set_timer(sk, HZ * 5); |
22121fc9 | 3019 | l2cap_send_disconn_req(conn, sk); |
1da177e4 LT |
3020 | goto done; |
3021 | } | |
3022 | ||
3023 | if (flags & 0x01) | |
3024 | goto done; | |
3025 | ||
1da177e4 LT |
3026 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
3027 | ||
3028 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
f64f9e71 JP |
3029 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || |
3030 | l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) | |
fcc203c3 GP |
3031 | l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; |
3032 | ||
1da177e4 | 3033 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 3034 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 3035 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 3036 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3037 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3038 | l2cap_ertm_init(sk); | |
3039 | ||
1da177e4 LT |
3040 | l2cap_chan_ready(sk); |
3041 | } | |
3042 | ||
3043 | done: | |
3044 | bh_unlock_sock(sk); | |
3045 | return 0; | |
3046 | } | |
3047 | ||
3048 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3049 | { | |
3050 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3051 | struct l2cap_disconn_rsp rsp; | |
3052 | u16 dcid, scid; | |
3053 | struct sock *sk; | |
3054 | ||
3055 | scid = __le16_to_cpu(req->scid); | |
3056 | dcid = __le16_to_cpu(req->dcid); | |
3057 | ||
3058 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3059 | ||
af05b30b GP |
3060 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3061 | if (!sk) | |
1da177e4 LT |
3062 | return 0; |
3063 | ||
aca3192c YH |
3064 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3065 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
3066 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3067 | ||
3068 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3069 | ||
1c2acffb | 3070 | skb_queue_purge(TX_QUEUE(sk)); |
0565c1c2 GP |
3071 | |
3072 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
3073 | skb_queue_purge(SREJ_QUEUE(sk)); | |
3074 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
3075 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
c1b4f43b | 3076 | del_timer(&l2cap_pi(sk)->ack_timer); |
0565c1c2 | 3077 | } |
1c2acffb | 3078 | |
1da177e4 LT |
3079 | l2cap_chan_del(sk, ECONNRESET); |
3080 | bh_unlock_sock(sk); | |
3081 | ||
3082 | l2cap_sock_kill(sk); | |
3083 | return 0; | |
3084 | } | |
3085 | ||
3086 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3087 | { | |
3088 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3089 | u16 dcid, scid; | |
3090 | struct sock *sk; | |
3091 | ||
3092 | scid = __le16_to_cpu(rsp->scid); | |
3093 | dcid = __le16_to_cpu(rsp->dcid); | |
3094 | ||
3095 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3096 | ||
af05b30b GP |
3097 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3098 | if (!sk) | |
1da177e4 LT |
3099 | return 0; |
3100 | ||
1c2acffb | 3101 | skb_queue_purge(TX_QUEUE(sk)); |
0565c1c2 GP |
3102 | |
3103 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
3104 | skb_queue_purge(SREJ_QUEUE(sk)); | |
3105 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
3106 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
c1b4f43b | 3107 | del_timer(&l2cap_pi(sk)->ack_timer); |
0565c1c2 | 3108 | } |
1c2acffb | 3109 | |
1da177e4 LT |
3110 | l2cap_chan_del(sk, 0); |
3111 | bh_unlock_sock(sk); | |
3112 | ||
3113 | l2cap_sock_kill(sk); | |
3114 | return 0; | |
3115 | } | |
3116 | ||
3117 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3118 | { | |
3119 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3120 | u16 type; |
3121 | ||
3122 | type = __le16_to_cpu(req->type); | |
3123 | ||
3124 | BT_DBG("type 0x%4.4x", type); | |
3125 | ||
f0709e03 MH |
3126 | if (type == L2CAP_IT_FEAT_MASK) { |
3127 | u8 buf[8]; | |
44dd46de | 3128 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3129 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3130 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3131 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
44dd46de | 3132 | if (enable_ertm) |
fcc203c3 GP |
3133 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3134 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 3135 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3136 | l2cap_send_cmd(conn, cmd->ident, |
3137 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3138 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3139 | u8 buf[12]; | |
3140 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
3141 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3142 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
3143 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
3144 | l2cap_send_cmd(conn, cmd->ident, | |
3145 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3146 | } else { |
3147 | struct l2cap_info_rsp rsp; | |
3148 | rsp.type = cpu_to_le16(type); | |
3149 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3150 | l2cap_send_cmd(conn, cmd->ident, | |
3151 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3152 | } | |
1da177e4 LT |
3153 | |
3154 | return 0; | |
3155 | } | |
3156 | ||
3157 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3158 | { | |
3159 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3160 | u16 type, result; | |
3161 | ||
3162 | type = __le16_to_cpu(rsp->type); | |
3163 | result = __le16_to_cpu(rsp->result); | |
3164 | ||
3165 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3166 | ||
4e8402a3 MH |
3167 | del_timer(&conn->info_timer); |
3168 | ||
984947dc | 3169 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3170 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3171 | |
47ec1dcd | 3172 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3173 | struct l2cap_info_req req; |
3174 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3175 | ||
3176 | conn->info_ident = l2cap_get_ident(conn); | |
3177 | ||
3178 | l2cap_send_cmd(conn, conn->info_ident, | |
3179 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3180 | } else { | |
3181 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3182 | conn->info_ident = 0; | |
3183 | ||
3184 | l2cap_conn_start(conn); | |
3185 | } | |
3186 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3187 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3188 | conn->info_ident = 0; |
984947dc MH |
3189 | |
3190 | l2cap_conn_start(conn); | |
3191 | } | |
4e8402a3 | 3192 | |
1da177e4 LT |
3193 | return 0; |
3194 | } | |
3195 | ||
3196 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
3197 | { | |
3198 | u8 *data = skb->data; | |
3199 | int len = skb->len; | |
3200 | struct l2cap_cmd_hdr cmd; | |
3201 | int err = 0; | |
3202 | ||
3203 | l2cap_raw_recv(conn, skb); | |
3204 | ||
3205 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3206 | u16 cmd_len; |
1da177e4 LT |
3207 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3208 | data += L2CAP_CMD_HDR_SIZE; | |
3209 | len -= L2CAP_CMD_HDR_SIZE; | |
3210 | ||
88219a0f | 3211 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3212 | |
88219a0f | 3213 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3214 | |
88219a0f | 3215 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3216 | BT_DBG("corrupted command"); |
3217 | break; | |
3218 | } | |
3219 | ||
3220 | switch (cmd.code) { | |
3221 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 3222 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
3223 | break; |
3224 | ||
3225 | case L2CAP_CONN_REQ: | |
3226 | err = l2cap_connect_req(conn, &cmd, data); | |
3227 | break; | |
3228 | ||
3229 | case L2CAP_CONN_RSP: | |
3230 | err = l2cap_connect_rsp(conn, &cmd, data); | |
3231 | break; | |
3232 | ||
3233 | case L2CAP_CONF_REQ: | |
88219a0f | 3234 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
3235 | break; |
3236 | ||
3237 | case L2CAP_CONF_RSP: | |
3238 | err = l2cap_config_rsp(conn, &cmd, data); | |
3239 | break; | |
3240 | ||
3241 | case L2CAP_DISCONN_REQ: | |
3242 | err = l2cap_disconnect_req(conn, &cmd, data); | |
3243 | break; | |
3244 | ||
3245 | case L2CAP_DISCONN_RSP: | |
3246 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
3247 | break; | |
3248 | ||
3249 | case L2CAP_ECHO_REQ: | |
88219a0f | 3250 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
3251 | break; |
3252 | ||
3253 | case L2CAP_ECHO_RSP: | |
3254 | break; | |
3255 | ||
3256 | case L2CAP_INFO_REQ: | |
3257 | err = l2cap_information_req(conn, &cmd, data); | |
3258 | break; | |
3259 | ||
3260 | case L2CAP_INFO_RSP: | |
3261 | err = l2cap_information_rsp(conn, &cmd, data); | |
3262 | break; | |
3263 | ||
3264 | default: | |
3265 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
3266 | err = -EINVAL; | |
3267 | break; | |
3268 | } | |
3269 | ||
3270 | if (err) { | |
3271 | struct l2cap_cmd_rej rej; | |
3272 | BT_DBG("error %d", err); | |
3273 | ||
3274 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3275 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3276 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3277 | } | |
3278 | ||
88219a0f AV |
3279 | data += cmd_len; |
3280 | len -= cmd_len; | |
1da177e4 LT |
3281 | } |
3282 | ||
3283 | kfree_skb(skb); | |
3284 | } | |
3285 | ||
fcc203c3 GP |
3286 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3287 | { | |
3288 | u16 our_fcs, rcv_fcs; | |
3289 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3290 | ||
3291 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
3292 | skb_trim(skb, skb->len - 2); | |
3293 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3294 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3295 | ||
3296 | if (our_fcs != rcv_fcs) | |
3297 | return -EINVAL; | |
3298 | } | |
3299 | return 0; | |
3300 | } | |
3301 | ||
d5392c8f GP |
3302 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
3303 | { | |
3304 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3305 | u16 control = 0; | |
3306 | ||
3307 | pi->frames_sent = 0; | |
3308 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
3309 | ||
3310 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3311 | ||
3312 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3313 | control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL; | |
3314 | l2cap_send_sframe(pi, control); | |
3315 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
3316 | } | |
3317 | ||
3318 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0) | |
3319 | __mod_retrans_timer(); | |
3320 | ||
3321 | l2cap_ertm_send(sk); | |
3322 | ||
3323 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
3324 | pi->frames_sent == 0) { | |
3325 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
3326 | l2cap_send_sframe(pi, control); |
3327 | } | |
3328 | } | |
3329 | ||
8f17154f GP |
3330 | static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
3331 | { | |
3332 | struct sk_buff *next_skb; | |
3333 | ||
3334 | bt_cb(skb)->tx_seq = tx_seq; | |
3335 | bt_cb(skb)->sar = sar; | |
3336 | ||
3337 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
3338 | if (!next_skb) { | |
3339 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
3340 | return; | |
3341 | } | |
3342 | ||
3343 | do { | |
3344 | if (bt_cb(next_skb)->tx_seq > tx_seq) { | |
3345 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); | |
3346 | return; | |
3347 | } | |
3348 | ||
3349 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
3350 | break; | |
3351 | ||
3352 | } while((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); | |
3353 | ||
3354 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
3355 | } | |
3356 | ||
c74e560c GP |
3357 | static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3358 | { | |
3359 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3360 | struct sk_buff *_skb; | |
3361 | int err = -EINVAL; | |
3362 | ||
3363 | switch (control & L2CAP_CTRL_SAR) { | |
3364 | case L2CAP_SDU_UNSEGMENTED: | |
3365 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3366 | kfree_skb(pi->sdu); | |
3367 | break; | |
3368 | } | |
3369 | ||
3370 | err = sock_queue_rcv_skb(sk, skb); | |
3371 | if (!err) | |
3372 | return 0; | |
3373 | ||
3374 | break; | |
3375 | ||
3376 | case L2CAP_SDU_START: | |
3377 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3378 | kfree_skb(pi->sdu); | |
3379 | break; | |
3380 | } | |
3381 | ||
3382 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3383 | skb_pull(skb, 2); | |
3384 | ||
052897ca GP |
3385 | if (pi->sdu_len > pi->imtu) { |
3386 | err = -EMSGSIZE; | |
3387 | break; | |
3388 | } | |
3389 | ||
c74e560c GP |
3390 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3391 | if (!pi->sdu) { | |
3392 | err = -ENOMEM; | |
3393 | break; | |
3394 | } | |
3395 | ||
3396 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3397 | ||
3398 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3399 | pi->partial_sdu_len = skb->len; | |
3400 | err = 0; | |
3401 | break; | |
3402 | ||
3403 | case L2CAP_SDU_CONTINUE: | |
3404 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3405 | break; | |
3406 | ||
3407 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3408 | ||
3409 | pi->partial_sdu_len += skb->len; | |
3410 | if (pi->partial_sdu_len > pi->sdu_len) | |
3411 | kfree_skb(pi->sdu); | |
3412 | else | |
3413 | err = 0; | |
3414 | ||
3415 | break; | |
3416 | ||
3417 | case L2CAP_SDU_END: | |
3418 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3419 | break; | |
3420 | ||
3421 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3422 | ||
3423 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3424 | pi->partial_sdu_len += skb->len; | |
3425 | ||
36f2fd58 GP |
3426 | if (pi->partial_sdu_len > pi->imtu) |
3427 | goto drop; | |
3428 | ||
c74e560c GP |
3429 | if (pi->partial_sdu_len == pi->sdu_len) { |
3430 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3431 | err = sock_queue_rcv_skb(sk, _skb); | |
3432 | if (err < 0) | |
3433 | kfree_skb(_skb); | |
3434 | } | |
c74e560c GP |
3435 | err = 0; |
3436 | ||
36f2fd58 GP |
3437 | drop: |
3438 | kfree_skb(pi->sdu); | |
c74e560c GP |
3439 | break; |
3440 | } | |
3441 | ||
3442 | kfree_skb(skb); | |
3443 | return err; | |
3444 | } | |
3445 | ||
8f17154f GP |
3446 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3447 | { | |
3448 | struct sk_buff *skb; | |
afefdbc4 | 3449 | u16 control; |
8f17154f GP |
3450 | |
3451 | while((skb = skb_peek(SREJ_QUEUE(sk)))) { | |
3452 | if (bt_cb(skb)->tx_seq != tx_seq) | |
3453 | break; | |
3454 | ||
3455 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3456 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
8f17154f GP |
3457 | l2cap_sar_reassembly_sdu(sk, skb, control); |
3458 | l2cap_pi(sk)->buffer_seq_srej = | |
3459 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
3460 | tx_seq++; | |
3461 | } | |
3462 | } | |
3463 | ||
3464 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3465 | { | |
3466 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3467 | struct srej_list *l, *tmp; | |
3468 | u16 control; | |
3469 | ||
3470 | list_for_each_entry_safe(l,tmp, SREJ_LIST(sk), list) { | |
3471 | if (l->tx_seq == tx_seq) { | |
3472 | list_del(&l->list); | |
3473 | kfree(l); | |
3474 | return; | |
3475 | } | |
3476 | control = L2CAP_SUPER_SELECT_REJECT; | |
3477 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3478 | l2cap_send_sframe(pi, control); | |
3479 | list_del(&l->list); | |
3480 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3481 | } | |
3482 | } | |
3483 | ||
3484 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3485 | { | |
3486 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3487 | struct srej_list *new; | |
3488 | u16 control; | |
3489 | ||
3490 | while (tx_seq != pi->expected_tx_seq) { | |
3491 | control = L2CAP_SUPER_SELECT_REJECT; | |
3492 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3493 | l2cap_send_sframe(pi, control); | |
3494 | ||
3495 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
3496 | new->tx_seq = pi->expected_tx_seq++; | |
3497 | list_add_tail(&new->list, SREJ_LIST(sk)); | |
3498 | } | |
3499 | pi->expected_tx_seq++; | |
3500 | } | |
3501 | ||
1c2acffb GP |
3502 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3503 | { | |
3504 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3505 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3506 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3507 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
803020c6 | 3508 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3509 | int err = 0; |
3510 | ||
3511 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3512 | ||
1d8f5d16 GP |
3513 | if (L2CAP_CTRL_FINAL & rx_control) { |
3514 | del_timer(&pi->monitor_timer); | |
3515 | if (pi->unacked_frames > 0) | |
3516 | __mod_retrans_timer(); | |
3517 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3518 | } | |
3519 | ||
9f121a5a GP |
3520 | pi->expected_ack_seq = req_seq; |
3521 | l2cap_drop_acked_frames(sk); | |
3522 | ||
8f17154f GP |
3523 | if (tx_seq == pi->expected_tx_seq) |
3524 | goto expected; | |
1c2acffb | 3525 | |
8f17154f GP |
3526 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3527 | struct srej_list *first; | |
30afb5b2 | 3528 | |
8f17154f GP |
3529 | first = list_first_entry(SREJ_LIST(sk), |
3530 | struct srej_list, list); | |
3531 | if (tx_seq == first->tx_seq) { | |
3532 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3533 | l2cap_check_srej_gap(sk, tx_seq); | |
3534 | ||
3535 | list_del(&first->list); | |
3536 | kfree(first); | |
3537 | ||
3538 | if (list_empty(SREJ_LIST(sk))) { | |
3539 | pi->buffer_seq = pi->buffer_seq_srej; | |
3540 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3541 | l2cap_send_ack(pi); |
8f17154f GP |
3542 | } |
3543 | } else { | |
3544 | struct srej_list *l; | |
3545 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3546 | ||
3547 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3548 | if (l->tx_seq == tx_seq) { | |
3549 | l2cap_resend_srejframe(sk, tx_seq); | |
3550 | return 0; | |
3551 | } | |
3552 | } | |
3553 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3554 | } |
3555 | } else { | |
8f17154f | 3556 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3557 | |
8f17154f GP |
3558 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3559 | pi->buffer_seq_srej = pi->buffer_seq; | |
3560 | ||
3561 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
3562 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3563 | ||
ef54fd93 GP |
3564 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3565 | ||
8f17154f | 3566 | l2cap_send_srejframe(sk, tx_seq); |
1c2acffb | 3567 | } |
30afb5b2 GP |
3568 | return 0; |
3569 | ||
8f17154f GP |
3570 | expected: |
3571 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3572 | ||
3573 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3574 | bt_cb(skb)->tx_seq = tx_seq; |
3575 | bt_cb(skb)->sar = sar; | |
3576 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3577 | return 0; |
3578 | } | |
3579 | ||
4ec10d97 GP |
3580 | if (rx_control & L2CAP_CTRL_FINAL) { |
3581 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3582 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
3583 | else { | |
f6e6b168 GP |
3584 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3585 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
4ec10d97 GP |
3586 | pi->next_tx_seq = pi->expected_ack_seq; |
3587 | l2cap_ertm_send(sk); | |
3588 | } | |
3589 | } | |
3590 | ||
8f17154f GP |
3591 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; |
3592 | ||
3593 | err = l2cap_sar_reassembly_sdu(sk, skb, rx_control); | |
3594 | if (err < 0) | |
3595 | return err; | |
3596 | ||
c1b4f43b GP |
3597 | __mod_ack_timer(); |
3598 | ||
803020c6 GP |
3599 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3600 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3601 | l2cap_send_ack(pi); |
3602 | ||
8f17154f | 3603 | return 0; |
1c2acffb GP |
3604 | } |
3605 | ||
e072745f | 3606 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
3607 | { |
3608 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 GP |
3609 | |
3610 | pi->expected_ack_seq = __get_reqseq(rx_control); | |
3611 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 3612 | |
e072745f | 3613 | if (rx_control & L2CAP_CTRL_POLL) { |
05fbd89d GP |
3614 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3615 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
3616 | (pi->unacked_frames > 0)) | |
3617 | __mod_retrans_timer(); | |
3618 | ||
3619 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3620 | l2cap_send_srejtail(sk); | |
3621 | } else { | |
3622 | l2cap_send_i_or_rr_or_rnr(sk); | |
3623 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3624 | } | |
1d8f5d16 | 3625 | |
e072745f GP |
3626 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3627 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 3628 | |
e072745f GP |
3629 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3630 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
3631 | else { | |
f6e6b168 GP |
3632 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3633 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
e072745f GP |
3634 | pi->next_tx_seq = pi->expected_ack_seq; |
3635 | l2cap_ertm_send(sk); | |
3636 | } | |
2246b2f1 | 3637 | |
e072745f | 3638 | } else { |
e072745f GP |
3639 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3640 | (pi->unacked_frames > 0)) | |
3641 | __mod_retrans_timer(); | |
1c2acffb | 3642 | |
2246b2f1 | 3643 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
e072745f GP |
3644 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) |
3645 | l2cap_send_ack(pi); | |
3646 | else | |
3647 | l2cap_ertm_send(sk); | |
3648 | } | |
3649 | } | |
2246b2f1 | 3650 | |
e072745f GP |
3651 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
3652 | { | |
3653 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3654 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3655 | |
e072745f GP |
3656 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3657 | ||
8abb52ee | 3658 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
3659 | l2cap_drop_acked_frames(sk); |
3660 | ||
3661 | if (rx_control & L2CAP_CTRL_FINAL) { | |
3662 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3663 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
3664 | else { | |
f6e6b168 GP |
3665 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3666 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
4ec10d97 GP |
3667 | pi->next_tx_seq = pi->expected_ack_seq; |
3668 | l2cap_ertm_send(sk); | |
4ec10d97 | 3669 | } |
e072745f | 3670 | } else { |
f6e6b168 GP |
3671 | if (!skb_queue_empty(TX_QUEUE(sk))) |
3672 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
e072745f GP |
3673 | pi->next_tx_seq = pi->expected_ack_seq; |
3674 | l2cap_ertm_send(sk); | |
30afb5b2 | 3675 | |
e072745f GP |
3676 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3677 | pi->srej_save_reqseq = tx_seq; | |
3678 | pi->conn_state |= L2CAP_CONN_REJ_ACT; | |
3679 | } | |
3680 | } | |
3681 | } | |
3682 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
3683 | { | |
3684 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3685 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3686 | |
e072745f | 3687 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3688 | |
e072745f GP |
3689 | if (rx_control & L2CAP_CTRL_POLL) { |
3690 | pi->expected_ack_seq = tx_seq; | |
3691 | l2cap_drop_acked_frames(sk); | |
3692 | l2cap_retransmit_frame(sk, tx_seq); | |
3693 | l2cap_ertm_send(sk); | |
3694 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { | |
3695 | pi->srej_save_reqseq = tx_seq; | |
3696 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3697 | } |
e072745f GP |
3698 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3699 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
3700 | pi->srej_save_reqseq == tx_seq) | |
3701 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
3702 | else | |
ef54fd93 | 3703 | l2cap_retransmit_frame(sk, tx_seq); |
e072745f GP |
3704 | } else { |
3705 | l2cap_retransmit_frame(sk, tx_seq); | |
3706 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { | |
3707 | pi->srej_save_reqseq = tx_seq; | |
3708 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3709 | } |
e072745f GP |
3710 | } |
3711 | } | |
3712 | ||
3713 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
3714 | { | |
3715 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3716 | u8 tx_seq = __get_reqseq(rx_control); | |
3717 | ||
3718 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; | |
3719 | pi->expected_ack_seq = tx_seq; | |
3720 | l2cap_drop_acked_frames(sk); | |
3721 | ||
99b0d4b7 GP |
3722 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
3723 | del_timer(&pi->retrans_timer); | |
3724 | if (rx_control & L2CAP_CTRL_POLL) { | |
3725 | u16 control = L2CAP_CTRL_FINAL; | |
3726 | l2cap_send_rr_or_rnr(pi, control); | |
3727 | } | |
3728 | return; | |
e072745f | 3729 | } |
99b0d4b7 GP |
3730 | |
3731 | if (rx_control & L2CAP_CTRL_POLL) | |
3732 | l2cap_send_srejtail(sk); | |
3733 | else | |
3734 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
3735 | } |
3736 | ||
3737 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
3738 | { | |
3739 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3740 | ||
3741 | if (L2CAP_CTRL_FINAL & rx_control) { | |
3742 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
3743 | if (l2cap_pi(sk)->unacked_frames > 0) | |
3744 | __mod_retrans_timer(); | |
3745 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3746 | } | |
3747 | ||
3748 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3749 | case L2CAP_SUPER_RCV_READY: | |
3750 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
3751 | break; |
3752 | ||
e072745f GP |
3753 | case L2CAP_SUPER_REJECT: |
3754 | l2cap_data_channel_rejframe(sk, rx_control); | |
3755 | break; | |
2246b2f1 | 3756 | |
e072745f GP |
3757 | case L2CAP_SUPER_SELECT_REJECT: |
3758 | l2cap_data_channel_srejframe(sk, rx_control); | |
3759 | break; | |
3760 | ||
3761 | case L2CAP_SUPER_RCV_NOT_READY: | |
3762 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
3763 | break; |
3764 | } | |
3765 | ||
faaebd19 | 3766 | kfree_skb(skb); |
1c2acffb GP |
3767 | return 0; |
3768 | } | |
3769 | ||
1da177e4 LT |
3770 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3771 | { | |
3772 | struct sock *sk; | |
6840ed07 | 3773 | struct l2cap_pinfo *pi; |
c74e560c | 3774 | u16 control, len; |
6840ed07 | 3775 | u8 tx_seq; |
1da177e4 LT |
3776 | |
3777 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
3778 | if (!sk) { | |
3779 | BT_DBG("unknown cid 0x%4.4x", cid); | |
3780 | goto drop; | |
3781 | } | |
3782 | ||
6840ed07 GP |
3783 | pi = l2cap_pi(sk); |
3784 | ||
1da177e4 LT |
3785 | BT_DBG("sk %p, len %d", sk, skb->len); |
3786 | ||
3787 | if (sk->sk_state != BT_CONNECTED) | |
3788 | goto drop; | |
3789 | ||
6840ed07 | 3790 | switch (pi->mode) { |
1c2acffb GP |
3791 | case L2CAP_MODE_BASIC: |
3792 | /* If socket recv buffers overflows we drop data here | |
3793 | * which is *bad* because L2CAP has to be reliable. | |
3794 | * But we don't have any other choice. L2CAP doesn't | |
3795 | * provide flow control mechanism. */ | |
1da177e4 | 3796 | |
6840ed07 | 3797 | if (pi->imtu < skb->len) |
1c2acffb | 3798 | goto drop; |
1da177e4 | 3799 | |
1c2acffb GP |
3800 | if (!sock_queue_rcv_skb(sk, skb)) |
3801 | goto done; | |
3802 | break; | |
3803 | ||
3804 | case L2CAP_MODE_ERTM: | |
3805 | control = get_unaligned_le16(skb->data); | |
3806 | skb_pull(skb, 2); | |
c74e560c | 3807 | len = skb->len; |
1c2acffb | 3808 | |
c74e560c GP |
3809 | if (__is_sar_start(control)) |
3810 | len -= 2; | |
3811 | ||
fcc203c3 GP |
3812 | if (pi->fcs == L2CAP_FCS_CRC16) |
3813 | len -= 2; | |
3814 | ||
30afb5b2 GP |
3815 | /* |
3816 | * We can just drop the corrupted I-frame here. | |
3817 | * Receiver will miss it and start proper recovery | |
3818 | * procedures and ask retransmission. | |
3819 | */ | |
1c762159 | 3820 | if (len > pi->mps) |
1c2acffb GP |
3821 | goto drop; |
3822 | ||
fcc203c3 GP |
3823 | if (l2cap_check_fcs(pi, skb)) |
3824 | goto drop; | |
3825 | ||
277ffbe3 GP |
3826 | if (__is_iframe(control)) { |
3827 | if (len < 4) | |
3828 | goto drop; | |
3829 | ||
fcafde2e | 3830 | l2cap_data_channel_iframe(sk, control, skb); |
277ffbe3 GP |
3831 | } else { |
3832 | if (len != 0) | |
3833 | goto drop; | |
3834 | ||
fcafde2e | 3835 | l2cap_data_channel_sframe(sk, control, skb); |
277ffbe3 | 3836 | } |
1c2acffb | 3837 | |
fcafde2e | 3838 | goto done; |
1c2acffb | 3839 | |
6840ed07 GP |
3840 | case L2CAP_MODE_STREAMING: |
3841 | control = get_unaligned_le16(skb->data); | |
3842 | skb_pull(skb, 2); | |
3843 | len = skb->len; | |
3844 | ||
3845 | if (__is_sar_start(control)) | |
3846 | len -= 2; | |
3847 | ||
fcc203c3 GP |
3848 | if (pi->fcs == L2CAP_FCS_CRC16) |
3849 | len -= 2; | |
3850 | ||
1c762159 | 3851 | if (len > pi->mps || len < 4 || __is_sframe(control)) |
6840ed07 GP |
3852 | goto drop; |
3853 | ||
fcc203c3 GP |
3854 | if (l2cap_check_fcs(pi, skb)) |
3855 | goto drop; | |
3856 | ||
6840ed07 GP |
3857 | tx_seq = __get_txseq(control); |
3858 | ||
3859 | if (pi->expected_tx_seq == tx_seq) | |
3860 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3861 | else | |
7dffe421 | 3862 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3863 | |
fcafde2e | 3864 | l2cap_sar_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
3865 | |
3866 | goto done; | |
3867 | ||
1c2acffb | 3868 | default: |
e8235c6b | 3869 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
3870 | break; |
3871 | } | |
1da177e4 LT |
3872 | |
3873 | drop: | |
3874 | kfree_skb(skb); | |
3875 | ||
3876 | done: | |
0139418c MH |
3877 | if (sk) |
3878 | bh_unlock_sock(sk); | |
3879 | ||
1da177e4 LT |
3880 | return 0; |
3881 | } | |
3882 | ||
8e036fc3 | 3883 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3884 | { |
3885 | struct sock *sk; | |
3886 | ||
3887 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3888 | if (!sk) | |
3889 | goto drop; | |
3890 | ||
3891 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3892 | ||
3893 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3894 | goto drop; | |
3895 | ||
3896 | if (l2cap_pi(sk)->imtu < skb->len) | |
3897 | goto drop; | |
3898 | ||
3899 | if (!sock_queue_rcv_skb(sk, skb)) | |
3900 | goto done; | |
3901 | ||
3902 | drop: | |
3903 | kfree_skb(skb); | |
3904 | ||
3905 | done: | |
af05b30b GP |
3906 | if (sk) |
3907 | bh_unlock_sock(sk); | |
1da177e4 LT |
3908 | return 0; |
3909 | } | |
3910 | ||
3911 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
3912 | { | |
3913 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3914 | u16 cid, len; |
3915 | __le16 psm; | |
1da177e4 LT |
3916 | |
3917 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3918 | cid = __le16_to_cpu(lh->cid); | |
3919 | len = __le16_to_cpu(lh->len); | |
3920 | ||
1c2acffb GP |
3921 | if (len != skb->len) { |
3922 | kfree_skb(skb); | |
3923 | return; | |
3924 | } | |
3925 | ||
1da177e4 LT |
3926 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3927 | ||
3928 | switch (cid) { | |
8db4dc46 | 3929 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3930 | l2cap_sig_channel(conn, skb); |
3931 | break; | |
3932 | ||
8db4dc46 | 3933 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3934 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3935 | skb_pull(skb, 2); |
3936 | l2cap_conless_channel(conn, psm, skb); | |
3937 | break; | |
3938 | ||
3939 | default: | |
3940 | l2cap_data_channel(conn, cid, skb); | |
3941 | break; | |
3942 | } | |
3943 | } | |
3944 | ||
3945 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3946 | ||
3947 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3948 | { | |
3949 | int exact = 0, lm1 = 0, lm2 = 0; | |
3950 | register struct sock *sk; | |
3951 | struct hlist_node *node; | |
3952 | ||
3953 | if (type != ACL_LINK) | |
3954 | return 0; | |
3955 | ||
3956 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3957 | ||
3958 | /* Find listening sockets and check their link_mode */ | |
3959 | read_lock(&l2cap_sk_list.lock); | |
3960 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
3961 | if (sk->sk_state != BT_LISTEN) | |
3962 | continue; | |
3963 | ||
3964 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
3965 | lm1 |= HCI_LM_ACCEPT; |
3966 | if (l2cap_pi(sk)->role_switch) | |
3967 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 3968 | exact++; |
2af6b9d5 MH |
3969 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3970 | lm2 |= HCI_LM_ACCEPT; | |
3971 | if (l2cap_pi(sk)->role_switch) | |
3972 | lm2 |= HCI_LM_MASTER; | |
3973 | } | |
1da177e4 LT |
3974 | } |
3975 | read_unlock(&l2cap_sk_list.lock); | |
3976 | ||
3977 | return exact ? lm1 : lm2; | |
3978 | } | |
3979 | ||
3980 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3981 | { | |
0139418c MH |
3982 | struct l2cap_conn *conn; |
3983 | ||
1da177e4 LT |
3984 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3985 | ||
3986 | if (hcon->type != ACL_LINK) | |
3987 | return 0; | |
3988 | ||
3989 | if (!status) { | |
1da177e4 LT |
3990 | conn = l2cap_conn_add(hcon, status); |
3991 | if (conn) | |
3992 | l2cap_conn_ready(conn); | |
0139418c | 3993 | } else |
1da177e4 LT |
3994 | l2cap_conn_del(hcon, bt_err(status)); |
3995 | ||
3996 | return 0; | |
3997 | } | |
3998 | ||
2950f21a MH |
3999 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4000 | { | |
4001 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4002 | ||
4003 | BT_DBG("hcon %p", hcon); | |
4004 | ||
4005 | if (hcon->type != ACL_LINK || !conn) | |
4006 | return 0x13; | |
4007 | ||
4008 | return conn->disc_reason; | |
4009 | } | |
4010 | ||
4011 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4012 | { |
4013 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4014 | ||
4015 | if (hcon->type != ACL_LINK) | |
4016 | return 0; | |
4017 | ||
4018 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4019 | |
1da177e4 LT |
4020 | return 0; |
4021 | } | |
4022 | ||
f62e4323 MH |
4023 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
4024 | { | |
bd3c9e25 | 4025 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
4026 | return; |
4027 | ||
f62e4323 MH |
4028 | if (encrypt == 0x00) { |
4029 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
4030 | l2cap_sock_clear_timer(sk); | |
4031 | l2cap_sock_set_timer(sk, HZ * 5); | |
4032 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
4033 | __l2cap_sock_close(sk, ECONNREFUSED); | |
4034 | } else { | |
4035 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
4036 | l2cap_sock_clear_timer(sk); | |
4037 | } | |
4038 | } | |
4039 | ||
8c1b2355 | 4040 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
4041 | { |
4042 | struct l2cap_chan_list *l; | |
0139418c | 4043 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 4044 | struct sock *sk; |
1da177e4 | 4045 | |
0139418c | 4046 | if (!conn) |
1da177e4 | 4047 | return 0; |
0139418c | 4048 | |
1da177e4 LT |
4049 | l = &conn->chan_list; |
4050 | ||
4051 | BT_DBG("conn %p", conn); | |
4052 | ||
4053 | read_lock(&l->lock); | |
4054 | ||
4055 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
4056 | bh_lock_sock(sk); | |
4057 | ||
6a8d3010 MH |
4058 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
4059 | bh_unlock_sock(sk); | |
4060 | continue; | |
4061 | } | |
4062 | ||
f62e4323 | 4063 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 4064 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 4065 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
4066 | bh_unlock_sock(sk); |
4067 | continue; | |
4068 | } | |
4069 | ||
b1235d79 MH |
4070 | if (sk->sk_state == BT_CONNECT) { |
4071 | if (!status) { | |
4072 | struct l2cap_conn_req req; | |
4073 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4074 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 4075 | |
b1235d79 | 4076 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
1da177e4 | 4077 | |
b1235d79 MH |
4078 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4079 | L2CAP_CONN_REQ, sizeof(req), &req); | |
4080 | } else { | |
4081 | l2cap_sock_clear_timer(sk); | |
4082 | l2cap_sock_set_timer(sk, HZ / 10); | |
4083 | } | |
4084 | } else if (sk->sk_state == BT_CONNECT2) { | |
4085 | struct l2cap_conn_rsp rsp; | |
4086 | __u16 result; | |
1da177e4 | 4087 | |
b1235d79 MH |
4088 | if (!status) { |
4089 | sk->sk_state = BT_CONFIG; | |
4090 | result = L2CAP_CR_SUCCESS; | |
4091 | } else { | |
4092 | sk->sk_state = BT_DISCONN; | |
4093 | l2cap_sock_set_timer(sk, HZ / 10); | |
4094 | result = L2CAP_CR_SEC_BLOCK; | |
4095 | } | |
4096 | ||
4097 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
4098 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4099 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 4100 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
4101 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4102 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4103 | } | |
1da177e4 LT |
4104 | |
4105 | bh_unlock_sock(sk); | |
4106 | } | |
4107 | ||
4108 | read_unlock(&l->lock); | |
b1235d79 | 4109 | |
1da177e4 LT |
4110 | return 0; |
4111 | } | |
4112 | ||
4113 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4114 | { | |
4115 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4116 | ||
4117 | if (!conn && !(conn = l2cap_conn_add(hcon, 0))) | |
4118 | goto drop; | |
4119 | ||
4120 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4121 | ||
4122 | if (flags & ACL_START) { | |
4123 | struct l2cap_hdr *hdr; | |
4124 | int len; | |
4125 | ||
4126 | if (conn->rx_len) { | |
4127 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4128 | kfree_skb(conn->rx_skb); | |
4129 | conn->rx_skb = NULL; | |
4130 | conn->rx_len = 0; | |
4131 | l2cap_conn_unreliable(conn, ECOMM); | |
4132 | } | |
4133 | ||
4134 | if (skb->len < 2) { | |
4135 | BT_ERR("Frame is too short (len %d)", skb->len); | |
4136 | l2cap_conn_unreliable(conn, ECOMM); | |
4137 | goto drop; | |
4138 | } | |
4139 | ||
4140 | hdr = (struct l2cap_hdr *) skb->data; | |
4141 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
4142 | ||
4143 | if (len == skb->len) { | |
4144 | /* Complete frame received */ | |
4145 | l2cap_recv_frame(conn, skb); | |
4146 | return 0; | |
4147 | } | |
4148 | ||
4149 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4150 | ||
4151 | if (skb->len > len) { | |
4152 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4153 | skb->len, len); | |
4154 | l2cap_conn_unreliable(conn, ECOMM); | |
4155 | goto drop; | |
4156 | } | |
4157 | ||
4158 | /* Allocate skb for the complete frame (with header) */ | |
af05b30b GP |
4159 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4160 | if (!conn->rx_skb) | |
1da177e4 LT |
4161 | goto drop; |
4162 | ||
d626f62b | 4163 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4164 | skb->len); |
1da177e4 LT |
4165 | conn->rx_len = len - skb->len; |
4166 | } else { | |
4167 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4168 | ||
4169 | if (!conn->rx_len) { | |
4170 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4171 | l2cap_conn_unreliable(conn, ECOMM); | |
4172 | goto drop; | |
4173 | } | |
4174 | ||
4175 | if (skb->len > conn->rx_len) { | |
4176 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4177 | skb->len, conn->rx_len); | |
4178 | kfree_skb(conn->rx_skb); | |
4179 | conn->rx_skb = NULL; | |
4180 | conn->rx_len = 0; | |
4181 | l2cap_conn_unreliable(conn, ECOMM); | |
4182 | goto drop; | |
4183 | } | |
4184 | ||
d626f62b | 4185 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4186 | skb->len); |
1da177e4 LT |
4187 | conn->rx_len -= skb->len; |
4188 | ||
4189 | if (!conn->rx_len) { | |
4190 | /* Complete frame received */ | |
4191 | l2cap_recv_frame(conn, conn->rx_skb); | |
4192 | conn->rx_skb = NULL; | |
4193 | } | |
4194 | } | |
4195 | ||
4196 | drop: | |
4197 | kfree_skb(skb); | |
4198 | return 0; | |
4199 | } | |
4200 | ||
aef7d97c | 4201 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4202 | { |
4203 | struct sock *sk; | |
4204 | struct hlist_node *node; | |
1da177e4 LT |
4205 | |
4206 | read_lock_bh(&l2cap_sk_list.lock); | |
4207 | ||
be9d1227 MH |
4208 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4209 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4210 | |
aef7d97c MH |
4211 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
4212 | batostr(&bt_sk(sk)->src), | |
4213 | batostr(&bt_sk(sk)->dst), | |
4214 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4215 | pi->scid, pi->dcid, | |
4216 | pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 4217 | } |
1da177e4 | 4218 | |
1da177e4 | 4219 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4220 | |
aef7d97c | 4221 | return 0; |
1da177e4 LT |
4222 | } |
4223 | ||
aef7d97c MH |
4224 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4225 | { | |
4226 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4227 | } | |
4228 | ||
4229 | static const struct file_operations l2cap_debugfs_fops = { | |
4230 | .open = l2cap_debugfs_open, | |
4231 | .read = seq_read, | |
4232 | .llseek = seq_lseek, | |
4233 | .release = single_release, | |
4234 | }; | |
4235 | ||
4236 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4237 | |
90ddc4f0 | 4238 | static const struct proto_ops l2cap_sock_ops = { |
1da177e4 LT |
4239 | .family = PF_BLUETOOTH, |
4240 | .owner = THIS_MODULE, | |
4241 | .release = l2cap_sock_release, | |
4242 | .bind = l2cap_sock_bind, | |
4243 | .connect = l2cap_sock_connect, | |
4244 | .listen = l2cap_sock_listen, | |
4245 | .accept = l2cap_sock_accept, | |
4246 | .getname = l2cap_sock_getname, | |
4247 | .sendmsg = l2cap_sock_sendmsg, | |
f66dc81f | 4248 | .recvmsg = l2cap_sock_recvmsg, |
1da177e4 | 4249 | .poll = bt_sock_poll, |
3241ad82 | 4250 | .ioctl = bt_sock_ioctl, |
1da177e4 LT |
4251 | .mmap = sock_no_mmap, |
4252 | .socketpair = sock_no_socketpair, | |
1da177e4 LT |
4253 | .shutdown = l2cap_sock_shutdown, |
4254 | .setsockopt = l2cap_sock_setsockopt, | |
4255 | .getsockopt = l2cap_sock_getsockopt | |
4256 | }; | |
4257 | ||
ec1b4cf7 | 4258 | static const struct net_proto_family l2cap_sock_family_ops = { |
1da177e4 LT |
4259 | .family = PF_BLUETOOTH, |
4260 | .owner = THIS_MODULE, | |
4261 | .create = l2cap_sock_create, | |
4262 | }; | |
4263 | ||
4264 | static struct hci_proto l2cap_hci_proto = { | |
4265 | .name = "L2CAP", | |
4266 | .id = HCI_PROTO_L2CAP, | |
4267 | .connect_ind = l2cap_connect_ind, | |
4268 | .connect_cfm = l2cap_connect_cfm, | |
4269 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4270 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4271 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4272 | .recv_acldata = l2cap_recv_acldata |
4273 | }; | |
4274 | ||
4275 | static int __init l2cap_init(void) | |
4276 | { | |
4277 | int err; | |
be9d1227 | 4278 | |
1da177e4 LT |
4279 | err = proto_register(&l2cap_proto, 0); |
4280 | if (err < 0) | |
4281 | return err; | |
4282 | ||
4283 | err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); | |
4284 | if (err < 0) { | |
4285 | BT_ERR("L2CAP socket registration failed"); | |
4286 | goto error; | |
4287 | } | |
4288 | ||
4289 | err = hci_register_proto(&l2cap_hci_proto); | |
4290 | if (err < 0) { | |
4291 | BT_ERR("L2CAP protocol registration failed"); | |
4292 | bt_sock_unregister(BTPROTO_L2CAP); | |
4293 | goto error; | |
4294 | } | |
4295 | ||
aef7d97c MH |
4296 | if (bt_debugfs) { |
4297 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4298 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4299 | if (!l2cap_debugfs) | |
4300 | BT_ERR("Failed to create L2CAP debug file"); | |
4301 | } | |
1da177e4 LT |
4302 | |
4303 | BT_INFO("L2CAP ver %s", VERSION); | |
4304 | BT_INFO("L2CAP socket layer initialized"); | |
4305 | ||
4306 | return 0; | |
4307 | ||
4308 | error: | |
4309 | proto_unregister(&l2cap_proto); | |
4310 | return err; | |
4311 | } | |
4312 | ||
4313 | static void __exit l2cap_exit(void) | |
4314 | { | |
aef7d97c | 4315 | debugfs_remove(l2cap_debugfs); |
1da177e4 LT |
4316 | |
4317 | if (bt_sock_unregister(BTPROTO_L2CAP) < 0) | |
4318 | BT_ERR("L2CAP socket unregistration failed"); | |
4319 | ||
4320 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) | |
4321 | BT_ERR("L2CAP protocol unregistration failed"); | |
4322 | ||
4323 | proto_unregister(&l2cap_proto); | |
4324 | } | |
4325 | ||
4326 | void l2cap_load(void) | |
4327 | { | |
4328 | /* Dummy function to trigger automatic L2CAP module loading by | |
4329 | * other modules that use L2CAP sockets but don't use any other | |
4330 | * symbols from it. */ | |
4331 | return; | |
4332 | } | |
4333 | EXPORT_SYMBOL(l2cap_load); | |
4334 | ||
4335 | module_init(l2cap_init); | |
4336 | module_exit(l2cap_exit); | |
4337 | ||
44dd46de MH |
4338 | module_param(enable_ertm, bool, 0644); |
4339 | MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); | |
4340 | ||
5fbcd3d1 MH |
4341 | module_param(max_transmit, uint, 0644); |
4342 | MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)"); | |
4343 | ||
369ba302 GP |
4344 | module_param(tx_window, uint, 0644); |
4345 | MODULE_PARM_DESC(tx_window, "Transmission window size value (default = 63)"); | |
4346 | ||
63fbd24e | 4347 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
4348 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4349 | MODULE_VERSION(VERSION); | |
4350 | MODULE_LICENSE("GPL"); | |
4351 | MODULE_ALIAS("bt-proto-0"); |