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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 | |
ce5706bd | 4 | Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> |
5d8868ff | 5 | Copyright (C) 2010 Google Inc. |
1da177e4 LT |
6 | |
7 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License version 2 as | |
11 | published by the Free Software Foundation; | |
12 | ||
13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
16 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
17 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
18 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
19 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
20 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
21 | ||
8e87d142 YH |
22 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
23 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
24 | SOFTWARE IS DISCLAIMED. |
25 | */ | |
26 | ||
bb58f747 | 27 | /* Bluetooth L2CAP core. */ |
1da177e4 | 28 | |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | ||
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
1da177e4 LT |
35 | #include <linux/sched.h> |
36 | #include <linux/slab.h> | |
37 | #include <linux/poll.h> | |
38 | #include <linux/fcntl.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/skbuff.h> | |
1da177e4 | 43 | #include <linux/list.h> |
be9d1227 | 44 | #include <linux/device.h> |
aef7d97c MH |
45 | #include <linux/debugfs.h> |
46 | #include <linux/seq_file.h> | |
af05b30b | 47 | #include <linux/uaccess.h> |
fcc203c3 | 48 | #include <linux/crc16.h> |
1da177e4 LT |
49 | #include <net/sock.h> |
50 | ||
51 | #include <asm/system.h> | |
1da177e4 LT |
52 | #include <asm/unaligned.h> |
53 | ||
54 | #include <net/bluetooth/bluetooth.h> | |
55 | #include <net/bluetooth/hci_core.h> | |
56 | #include <net/bluetooth/l2cap.h> | |
57 | ||
dd135240 | 58 | #define VERSION "2.15" |
44dd46de | 59 | |
bb58f747 | 60 | int disable_ertm; |
f0709e03 | 61 | |
47ec1dcd | 62 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 63 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 64 | |
1890d36b GP |
65 | static struct workqueue_struct *_busy_wq; |
66 | ||
bb58f747 | 67 | struct bt_sock_list l2cap_sk_list = { |
d5fb2962 | 68 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
69 | }; |
70 | ||
1890d36b GP |
71 | static void l2cap_busy_work(struct work_struct *work); |
72 | ||
1da177e4 | 73 | static void l2cap_sock_close(struct sock *sk); |
1da177e4 | 74 | |
e9aeb2dd | 75 | static int l2cap_build_conf_req(struct sock *sk, void *data); |
1da177e4 LT |
76 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
77 | u8 code, u8 ident, u16 dlen, void *data); | |
78 | ||
218bb9df GP |
79 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
80 | ||
1da177e4 | 81 | /* ---- L2CAP timers ---- */ |
bb58f747 | 82 | void l2cap_sock_set_timer(struct sock *sk, long timeout) |
940a9eea AE |
83 | { |
84 | BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); | |
85 | sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); | |
86 | } | |
87 | ||
88 | static void l2cap_sock_clear_timer(struct sock *sk) | |
89 | { | |
90 | BT_DBG("sock %p state %d", sk, sk->sk_state); | |
91 | sk_stop_timer(sk, &sk->sk_timer); | |
92 | } | |
93 | ||
0139418c MH |
94 | /* ---- L2CAP channels ---- */ |
95 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
96 | { | |
97 | struct sock *s; | |
98 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
99 | if (l2cap_pi(s)->dcid == cid) | |
100 | break; | |
101 | } | |
102 | return s; | |
103 | } | |
104 | ||
105 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
106 | { | |
107 | struct sock *s; | |
108 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
109 | if (l2cap_pi(s)->scid == cid) | |
110 | break; | |
111 | } | |
112 | return s; | |
113 | } | |
114 | ||
115 | /* Find channel with given SCID. | |
116 | * Returns locked socket */ | |
117 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
118 | { | |
119 | struct sock *s; | |
120 | read_lock(&l->lock); | |
121 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
122 | if (s) |
123 | bh_lock_sock(s); | |
0139418c MH |
124 | read_unlock(&l->lock); |
125 | return s; | |
126 | } | |
127 | ||
128 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
129 | { | |
130 | struct sock *s; | |
131 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
132 | if (l2cap_pi(s)->ident == ident) | |
133 | break; | |
134 | } | |
135 | return s; | |
136 | } | |
137 | ||
138 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
139 | { | |
140 | struct sock *s; | |
141 | read_lock(&l->lock); | |
142 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
143 | if (s) |
144 | bh_lock_sock(s); | |
0139418c MH |
145 | read_unlock(&l->lock); |
146 | return s; | |
147 | } | |
148 | ||
149 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
150 | { | |
8db4dc46 | 151 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 152 | |
8db4dc46 | 153 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 154 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
155 | return cid; |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
162 | { | |
163 | sock_hold(sk); | |
164 | ||
165 | if (l->head) | |
166 | l2cap_pi(l->head)->prev_c = sk; | |
167 | ||
168 | l2cap_pi(sk)->next_c = l->head; | |
169 | l2cap_pi(sk)->prev_c = NULL; | |
170 | l->head = sk; | |
171 | } | |
172 | ||
173 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
174 | { | |
175 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
176 | ||
fd1278d7 | 177 | write_lock_bh(&l->lock); |
0139418c MH |
178 | if (sk == l->head) |
179 | l->head = next; | |
180 | ||
181 | if (next) | |
182 | l2cap_pi(next)->prev_c = prev; | |
183 | if (prev) | |
184 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 185 | write_unlock_bh(&l->lock); |
0139418c MH |
186 | |
187 | __sock_put(sk); | |
188 | } | |
189 | ||
190 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
191 | { | |
192 | struct l2cap_chan_list *l = &conn->chan_list; | |
193 | ||
af05b30b GP |
194 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
195 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 196 | |
2950f21a MH |
197 | conn->disc_reason = 0x13; |
198 | ||
0139418c MH |
199 | l2cap_pi(sk)->conn = conn; |
200 | ||
bd3c9e25 | 201 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
0139418c MH |
202 | /* Alloc CID for connection-oriented socket */ |
203 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
204 | } else if (sk->sk_type == SOCK_DGRAM) { | |
205 | /* Connectionless socket */ | |
8db4dc46 GP |
206 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
207 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
208 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
209 | } else { | |
210 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
211 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
212 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
213 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
214 | } | |
215 | ||
216 | __l2cap_chan_link(l, sk); | |
217 | ||
218 | if (parent) | |
219 | bt_accept_enqueue(parent, sk); | |
220 | } | |
221 | ||
8e87d142 | 222 | /* Delete channel. |
0139418c MH |
223 | * Must be called on the locked socket. */ |
224 | static void l2cap_chan_del(struct sock *sk, int err) | |
225 | { | |
226 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
227 | struct sock *parent = bt_sk(sk)->parent; | |
228 | ||
229 | l2cap_sock_clear_timer(sk); | |
230 | ||
231 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
232 | ||
8e87d142 | 233 | if (conn) { |
0139418c MH |
234 | /* Unlink from channel list */ |
235 | l2cap_chan_unlink(&conn->chan_list, sk); | |
236 | l2cap_pi(sk)->conn = NULL; | |
237 | hci_conn_put(conn->hcon); | |
238 | } | |
239 | ||
b1235d79 | 240 | sk->sk_state = BT_CLOSED; |
0139418c MH |
241 | sock_set_flag(sk, SOCK_ZAPPED); |
242 | ||
243 | if (err) | |
244 | sk->sk_err = err; | |
245 | ||
246 | if (parent) { | |
247 | bt_accept_unlink(sk); | |
248 | parent->sk_data_ready(parent, 0); | |
249 | } else | |
250 | sk->sk_state_change(sk); | |
c13ffa62 GP |
251 | |
252 | skb_queue_purge(TX_QUEUE(sk)); | |
253 | ||
254 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
255 | struct srej_list *l, *tmp; | |
256 | ||
257 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
258 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
259 | del_timer(&l2cap_pi(sk)->ack_timer); | |
260 | ||
261 | skb_queue_purge(SREJ_QUEUE(sk)); | |
262 | skb_queue_purge(BUSY_QUEUE(sk)); | |
263 | ||
264 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { | |
265 | list_del(&l->list); | |
266 | kfree(l); | |
267 | } | |
268 | } | |
0139418c MH |
269 | } |
270 | ||
8556edd3 | 271 | static inline u8 l2cap_get_auth_type(struct sock *sk) |
79d554a6 | 272 | { |
8556edd3 JH |
273 | if (sk->sk_type == SOCK_RAW) { |
274 | switch (l2cap_pi(sk)->sec_level) { | |
275 | case BT_SECURITY_HIGH: | |
276 | return HCI_AT_DEDICATED_BONDING_MITM; | |
277 | case BT_SECURITY_MEDIUM: | |
278 | return HCI_AT_DEDICATED_BONDING; | |
279 | default: | |
280 | return HCI_AT_NO_BONDING; | |
281 | } | |
282 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { | |
283 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
284 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 285 | |
00ae4af9 | 286 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 287 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 288 | else |
8556edd3 | 289 | return HCI_AT_NO_BONDING; |
00ae4af9 MH |
290 | } else { |
291 | switch (l2cap_pi(sk)->sec_level) { | |
292 | case BT_SECURITY_HIGH: | |
8556edd3 | 293 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 294 | case BT_SECURITY_MEDIUM: |
8556edd3 | 295 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 296 | default: |
8556edd3 | 297 | return HCI_AT_NO_BONDING; |
00ae4af9 | 298 | } |
0684e5f9 | 299 | } |
8556edd3 JH |
300 | } |
301 | ||
302 | /* Service level security */ | |
303 | static inline int l2cap_check_security(struct sock *sk) | |
304 | { | |
305 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
306 | __u8 auth_type; | |
307 | ||
308 | auth_type = l2cap_get_auth_type(sk); | |
79d554a6 | 309 | |
0684e5f9 MH |
310 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
311 | auth_type); | |
79d554a6 MH |
312 | } |
313 | ||
4e8402a3 MH |
314 | static inline u8 l2cap_get_ident(struct l2cap_conn *conn) |
315 | { | |
316 | u8 id; | |
317 | ||
318 | /* Get next available identificator. | |
319 | * 1 - 128 are used by kernel. | |
320 | * 129 - 199 are reserved. | |
321 | * 200 - 254 are used by utilities like l2ping, etc. | |
322 | */ | |
323 | ||
324 | spin_lock_bh(&conn->lock); | |
325 | ||
326 | if (++conn->tx_ident > 128) | |
327 | conn->tx_ident = 1; | |
328 | ||
329 | id = conn->tx_ident; | |
330 | ||
331 | spin_unlock_bh(&conn->lock); | |
332 | ||
333 | return id; | |
334 | } | |
335 | ||
9a9c6a34 | 336 | static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
337 | { |
338 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 339 | u8 flags; |
4e8402a3 MH |
340 | |
341 | BT_DBG("code 0x%2.2x", code); | |
342 | ||
343 | if (!skb) | |
9a9c6a34 | 344 | return; |
4e8402a3 | 345 | |
e702112f AE |
346 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
347 | flags = ACL_START_NO_FLUSH; | |
348 | else | |
349 | flags = ACL_START; | |
350 | ||
351 | hci_send_acl(conn->hcon, skb, flags); | |
4e8402a3 MH |
352 | } |
353 | ||
9a9c6a34 | 354 | static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
1c2acffb GP |
355 | { |
356 | struct sk_buff *skb; | |
357 | struct l2cap_hdr *lh; | |
358 | struct l2cap_conn *conn = pi->conn; | |
c13ffa62 | 359 | struct sock *sk = (struct sock *)pi; |
fcc203c3 | 360 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 361 | u8 flags; |
fcc203c3 | 362 | |
c13ffa62 GP |
363 | if (sk->sk_state != BT_CONNECTED) |
364 | return; | |
365 | ||
fcc203c3 GP |
366 | if (pi->fcs == L2CAP_FCS_CRC16) |
367 | hlen += 2; | |
1c2acffb GP |
368 | |
369 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
370 | ||
fcc203c3 | 371 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
372 | control |= L2CAP_CTRL_FRAME_TYPE; |
373 | ||
9e917af1 GP |
374 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
375 | control |= L2CAP_CTRL_FINAL; | |
376 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
377 | } | |
378 | ||
f0946ccf GP |
379 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
380 | control |= L2CAP_CTRL_POLL; | |
381 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
382 | } | |
383 | ||
1c2acffb GP |
384 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
385 | if (!skb) | |
9a9c6a34 | 386 | return; |
1c2acffb GP |
387 | |
388 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 389 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
390 | lh->cid = cpu_to_le16(pi->dcid); |
391 | put_unaligned_le16(control, skb_put(skb, 2)); | |
392 | ||
fcc203c3 GP |
393 | if (pi->fcs == L2CAP_FCS_CRC16) { |
394 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
395 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
396 | } | |
397 | ||
e702112f AE |
398 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
399 | flags = ACL_START_NO_FLUSH; | |
400 | else | |
401 | flags = ACL_START; | |
402 | ||
403 | hci_send_acl(pi->conn->hcon, skb, flags); | |
1c2acffb GP |
404 | } |
405 | ||
9a9c6a34 | 406 | static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
7e743090 | 407 | { |
1890d36b | 408 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 409 | control |= L2CAP_SUPER_RCV_NOT_READY; |
1890d36b GP |
410 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
411 | } else | |
7e743090 GP |
412 | control |= L2CAP_SUPER_RCV_READY; |
413 | ||
2ab25cdd GP |
414 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
415 | ||
9a9c6a34 | 416 | l2cap_send_sframe(pi, control); |
7e743090 GP |
417 | } |
418 | ||
e501d055 AE |
419 | static inline int __l2cap_no_conn_pending(struct sock *sk) |
420 | { | |
421 | return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); | |
422 | } | |
423 | ||
79d554a6 MH |
424 | static void l2cap_do_start(struct sock *sk) |
425 | { | |
426 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
427 | ||
428 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
429 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
430 | return; | |
431 | ||
e501d055 | 432 | if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { |
b1235d79 MH |
433 | struct l2cap_conn_req req; |
434 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
435 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 436 | |
b1235d79 | 437 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 438 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 439 | |
b1235d79 | 440 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 441 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 442 | } |
79d554a6 MH |
443 | } else { |
444 | struct l2cap_info_req req; | |
445 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
446 | ||
447 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
448 | conn->info_ident = l2cap_get_ident(conn); | |
449 | ||
450 | mod_timer(&conn->info_timer, jiffies + | |
451 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
452 | ||
453 | l2cap_send_cmd(conn, conn->info_ident, | |
454 | L2CAP_INFO_REQ, sizeof(req), &req); | |
455 | } | |
456 | } | |
457 | ||
cf6c2c0b GP |
458 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
459 | { | |
460 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 461 | if (!disable_ertm) |
cf6c2c0b GP |
462 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
463 | ||
464 | switch (mode) { | |
465 | case L2CAP_MODE_ERTM: | |
466 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
467 | case L2CAP_MODE_STREAMING: | |
468 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
469 | default: | |
470 | return 0x00; | |
471 | } | |
472 | } | |
473 | ||
9b108fc0 | 474 | static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) |
22121fc9 GP |
475 | { |
476 | struct l2cap_disconn_req req; | |
477 | ||
c13ffa62 GP |
478 | if (!conn) |
479 | return; | |
480 | ||
481 | skb_queue_purge(TX_QUEUE(sk)); | |
482 | ||
483 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
484 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
485 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
486 | del_timer(&l2cap_pi(sk)->ack_timer); | |
487 | } | |
488 | ||
22121fc9 GP |
489 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
490 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
491 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
492 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
493 | |
494 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 495 | sk->sk_err = err; |
22121fc9 GP |
496 | } |
497 | ||
1da177e4 | 498 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
499 | static void l2cap_conn_start(struct l2cap_conn *conn) |
500 | { | |
501 | struct l2cap_chan_list *l = &conn->chan_list; | |
cf6c2c0b | 502 | struct sock_del_list del, *tmp1, *tmp2; |
4e8402a3 MH |
503 | struct sock *sk; |
504 | ||
505 | BT_DBG("conn %p", conn); | |
506 | ||
cf6c2c0b GP |
507 | INIT_LIST_HEAD(&del.list); |
508 | ||
4e8402a3 MH |
509 | read_lock(&l->lock); |
510 | ||
511 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
512 | bh_lock_sock(sk); | |
513 | ||
bd3c9e25 GP |
514 | if (sk->sk_type != SOCK_SEQPACKET && |
515 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
516 | bh_unlock_sock(sk); |
517 | continue; | |
518 | } | |
519 | ||
520 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 521 | struct l2cap_conn_req req; |
79d554a6 | 522 | |
47731de7 GP |
523 | if (!l2cap_check_security(sk) || |
524 | !__l2cap_no_conn_pending(sk)) { | |
525 | bh_unlock_sock(sk); | |
526 | continue; | |
527 | } | |
79d554a6 | 528 | |
47731de7 GP |
529 | if (!l2cap_mode_supported(l2cap_pi(sk)->mode, |
530 | conn->feat_mask) | |
531 | && l2cap_pi(sk)->conf_state & | |
532 | L2CAP_CONF_STATE2_DEVICE) { | |
533 | tmp1 = kzalloc(sizeof(struct sock_del_list), | |
534 | GFP_ATOMIC); | |
535 | tmp1->sk = sk; | |
536 | list_add_tail(&tmp1->list, &del.list); | |
537 | bh_unlock_sock(sk); | |
538 | continue; | |
b1235d79 | 539 | } |
47731de7 GP |
540 | |
541 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
542 | req.psm = l2cap_pi(sk)->psm; | |
543 | ||
544 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); | |
545 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; | |
546 | ||
547 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
548 | L2CAP_CONN_REQ, sizeof(req), &req); | |
549 | ||
79d554a6 MH |
550 | } else if (sk->sk_state == BT_CONNECT2) { |
551 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 552 | char buf[128]; |
79d554a6 MH |
553 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
554 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
555 | ||
2af6b9d5 | 556 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
557 | if (bt_sk(sk)->defer_setup) { |
558 | struct sock *parent = bt_sk(sk)->parent; | |
559 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
560 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
561 | parent->sk_data_ready(parent, 0); | |
562 | ||
563 | } else { | |
564 | sk->sk_state = BT_CONFIG; | |
565 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
566 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
567 | } | |
79d554a6 MH |
568 | } else { |
569 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
570 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
571 | } | |
572 | ||
573 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
574 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
e9aeb2dd GP |
575 | |
576 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || | |
577 | rsp.result != L2CAP_CR_SUCCESS) { | |
578 | bh_unlock_sock(sk); | |
579 | continue; | |
580 | } | |
581 | ||
582 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
583 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
584 | l2cap_build_conf_req(sk, buf), buf); | |
585 | l2cap_pi(sk)->num_conf_req++; | |
4e8402a3 MH |
586 | } |
587 | ||
588 | bh_unlock_sock(sk); | |
589 | } | |
590 | ||
591 | read_unlock(&l->lock); | |
cf6c2c0b GP |
592 | |
593 | list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { | |
594 | bh_lock_sock(tmp1->sk); | |
595 | __l2cap_sock_close(tmp1->sk, ECONNRESET); | |
596 | bh_unlock_sock(tmp1->sk); | |
597 | list_del(&tmp1->list); | |
598 | kfree(tmp1); | |
599 | } | |
4e8402a3 MH |
600 | } |
601 | ||
602 | static void l2cap_conn_ready(struct l2cap_conn *conn) | |
603 | { | |
79d554a6 MH |
604 | struct l2cap_chan_list *l = &conn->chan_list; |
605 | struct sock *sk; | |
4e8402a3 | 606 | |
79d554a6 | 607 | BT_DBG("conn %p", conn); |
4e8402a3 | 608 | |
79d554a6 | 609 | read_lock(&l->lock); |
4e8402a3 | 610 | |
79d554a6 MH |
611 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
612 | bh_lock_sock(sk); | |
4e8402a3 | 613 | |
bd3c9e25 GP |
614 | if (sk->sk_type != SOCK_SEQPACKET && |
615 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
616 | l2cap_sock_clear_timer(sk); |
617 | sk->sk_state = BT_CONNECTED; | |
618 | sk->sk_state_change(sk); | |
619 | } else if (sk->sk_state == BT_CONNECT) | |
620 | l2cap_do_start(sk); | |
4e8402a3 | 621 | |
79d554a6 | 622 | bh_unlock_sock(sk); |
4e8402a3 | 623 | } |
79d554a6 MH |
624 | |
625 | read_unlock(&l->lock); | |
4e8402a3 MH |
626 | } |
627 | ||
628 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
629 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
630 | { | |
631 | struct l2cap_chan_list *l = &conn->chan_list; | |
632 | struct sock *sk; | |
633 | ||
634 | BT_DBG("conn %p", conn); | |
635 | ||
636 | read_lock(&l->lock); | |
637 | ||
638 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 639 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
640 | sk->sk_err = err; |
641 | } | |
642 | ||
643 | read_unlock(&l->lock); | |
644 | } | |
645 | ||
646 | static void l2cap_info_timeout(unsigned long arg) | |
647 | { | |
648 | struct l2cap_conn *conn = (void *) arg; | |
649 | ||
984947dc | 650 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 651 | conn->info_ident = 0; |
984947dc | 652 | |
4e8402a3 MH |
653 | l2cap_conn_start(conn); |
654 | } | |
655 | ||
1da177e4 LT |
656 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
657 | { | |
0139418c | 658 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 659 | |
0139418c | 660 | if (conn || status) |
1da177e4 LT |
661 | return conn; |
662 | ||
0139418c MH |
663 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
664 | if (!conn) | |
1da177e4 | 665 | return NULL; |
1da177e4 LT |
666 | |
667 | hcon->l2cap_data = conn; | |
668 | conn->hcon = hcon; | |
669 | ||
0139418c MH |
670 | BT_DBG("hcon %p conn %p", hcon, conn); |
671 | ||
1da177e4 LT |
672 | conn->mtu = hcon->hdev->acl_mtu; |
673 | conn->src = &hcon->hdev->bdaddr; | |
674 | conn->dst = &hcon->dst; | |
675 | ||
4e8402a3 MH |
676 | conn->feat_mask = 0; |
677 | ||
1da177e4 LT |
678 | spin_lock_init(&conn->lock); |
679 | rwlock_init(&conn->chan_list.lock); | |
680 | ||
45054dc1 DY |
681 | setup_timer(&conn->info_timer, l2cap_info_timeout, |
682 | (unsigned long) conn); | |
683 | ||
2950f21a MH |
684 | conn->disc_reason = 0x13; |
685 | ||
1da177e4 LT |
686 | return conn; |
687 | } | |
688 | ||
0139418c | 689 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 690 | { |
0139418c | 691 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
692 | struct sock *sk; |
693 | ||
0139418c MH |
694 | if (!conn) |
695 | return; | |
1da177e4 LT |
696 | |
697 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
698 | ||
7585b97a | 699 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
700 | |
701 | /* Kill channels */ | |
702 | while ((sk = conn->chan_list.head)) { | |
703 | bh_lock_sock(sk); | |
704 | l2cap_chan_del(sk, err); | |
705 | bh_unlock_sock(sk); | |
706 | l2cap_sock_kill(sk); | |
707 | } | |
708 | ||
8e8440f5 DY |
709 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
710 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 711 | |
1da177e4 LT |
712 | hcon->l2cap_data = NULL; |
713 | kfree(conn); | |
1da177e4 LT |
714 | } |
715 | ||
716 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
717 | { | |
718 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 719 | write_lock_bh(&l->lock); |
1da177e4 | 720 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 721 | write_unlock_bh(&l->lock); |
1da177e4 LT |
722 | } |
723 | ||
1da177e4 | 724 | /* ---- Socket interface ---- */ |
1da177e4 LT |
725 | |
726 | /* Find socket with psm and source bdaddr. | |
727 | * Returns closest match. | |
728 | */ | |
e0f0cb56 | 729 | static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
730 | { |
731 | struct sock *sk = NULL, *sk1 = NULL; | |
732 | struct hlist_node *node; | |
733 | ||
e0f0cb56 GP |
734 | read_lock(&l2cap_sk_list.lock); |
735 | ||
1da177e4 LT |
736 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
737 | if (state && sk->sk_state != state) | |
738 | continue; | |
739 | ||
740 | if (l2cap_pi(sk)->psm == psm) { | |
741 | /* Exact match. */ | |
742 | if (!bacmp(&bt_sk(sk)->src, src)) | |
743 | break; | |
744 | ||
745 | /* Closest match */ | |
746 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
747 | sk1 = sk; | |
748 | } | |
749 | } | |
1da177e4 | 750 | |
1da177e4 | 751 | read_unlock(&l2cap_sk_list.lock); |
e0f0cb56 GP |
752 | |
753 | return node ? sk : sk1; | |
1da177e4 LT |
754 | } |
755 | ||
1da177e4 LT |
756 | static void l2cap_sock_cleanup_listen(struct sock *parent) |
757 | { | |
758 | struct sock *sk; | |
759 | ||
760 | BT_DBG("parent %p", parent); | |
761 | ||
762 | /* Close not yet accepted channels */ | |
763 | while ((sk = bt_accept_dequeue(parent, NULL))) | |
764 | l2cap_sock_close(sk); | |
765 | ||
b1235d79 | 766 | parent->sk_state = BT_CLOSED; |
1da177e4 LT |
767 | sock_set_flag(parent, SOCK_ZAPPED); |
768 | } | |
769 | ||
770 | /* Kill socket (only if zapped and orphan) | |
771 | * Must be called on unlocked socket. | |
772 | */ | |
bb58f747 | 773 | void l2cap_sock_kill(struct sock *sk) |
1da177e4 LT |
774 | { |
775 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
776 | return; | |
777 | ||
778 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
779 | ||
780 | /* Kill poor orphan */ | |
781 | bt_sock_unlink(&l2cap_sk_list, sk); | |
782 | sock_set_flag(sk, SOCK_DEAD); | |
783 | sock_put(sk); | |
784 | } | |
785 | ||
bb58f747 | 786 | void __l2cap_sock_close(struct sock *sk, int reason) |
1da177e4 LT |
787 | { |
788 | BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); | |
789 | ||
790 | switch (sk->sk_state) { | |
791 | case BT_LISTEN: | |
792 | l2cap_sock_cleanup_listen(sk); | |
793 | break; | |
794 | ||
795 | case BT_CONNECTED: | |
796 | case BT_CONFIG: | |
bd3c9e25 GP |
797 | if (sk->sk_type == SOCK_SEQPACKET || |
798 | sk->sk_type == SOCK_STREAM) { | |
1da177e4 | 799 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1da177e4 | 800 | |
1da177e4 | 801 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
9b108fc0 | 802 | l2cap_send_disconn_req(conn, sk, reason); |
b1235d79 | 803 | } else |
1da177e4 | 804 | l2cap_chan_del(sk, reason); |
1da177e4 LT |
805 | break; |
806 | ||
f66dc81f | 807 | case BT_CONNECT2: |
bd3c9e25 GP |
808 | if (sk->sk_type == SOCK_SEQPACKET || |
809 | sk->sk_type == SOCK_STREAM) { | |
f66dc81f MH |
810 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
811 | struct l2cap_conn_rsp rsp; | |
812 | __u16 result; | |
813 | ||
814 | if (bt_sk(sk)->defer_setup) | |
815 | result = L2CAP_CR_SEC_BLOCK; | |
816 | else | |
817 | result = L2CAP_CR_BAD_PSM; | |
e733fb62 | 818 | sk->sk_state = BT_DISCONN; |
f66dc81f MH |
819 | |
820 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
821 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
822 | rsp.result = cpu_to_le16(result); | |
823 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
824 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
825 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
826 | } else | |
827 | l2cap_chan_del(sk, reason); | |
828 | break; | |
829 | ||
1da177e4 LT |
830 | case BT_CONNECT: |
831 | case BT_DISCONN: | |
832 | l2cap_chan_del(sk, reason); | |
833 | break; | |
834 | ||
835 | default: | |
836 | sock_set_flag(sk, SOCK_ZAPPED); | |
837 | break; | |
838 | } | |
839 | } | |
840 | ||
841 | /* Must be called on unlocked socket. */ | |
842 | static void l2cap_sock_close(struct sock *sk) | |
843 | { | |
844 | l2cap_sock_clear_timer(sk); | |
845 | lock_sock(sk); | |
846 | __l2cap_sock_close(sk, ECONNRESET); | |
847 | release_sock(sk); | |
848 | l2cap_sock_kill(sk); | |
849 | } | |
850 | ||
1da177e4 LT |
851 | static int l2cap_do_connect(struct sock *sk) |
852 | { | |
853 | bdaddr_t *src = &bt_sk(sk)->src; | |
854 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
855 | struct l2cap_conn *conn; | |
856 | struct hci_conn *hcon; | |
857 | struct hci_dev *hdev; | |
09ab6f4c | 858 | __u8 auth_type; |
44d0e48e | 859 | int err; |
1da177e4 | 860 | |
f29972de MH |
861 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
862 | l2cap_pi(sk)->psm); | |
1da177e4 | 863 | |
af05b30b GP |
864 | hdev = hci_get_route(dst, src); |
865 | if (!hdev) | |
1da177e4 LT |
866 | return -EHOSTUNREACH; |
867 | ||
868 | hci_dev_lock_bh(hdev); | |
869 | ||
870 | err = -ENOMEM; | |
871 | ||
8556edd3 | 872 | auth_type = l2cap_get_auth_type(sk); |
09ab6f4c | 873 | |
2af6b9d5 MH |
874 | hcon = hci_connect(hdev, ACL_LINK, dst, |
875 | l2cap_pi(sk)->sec_level, auth_type); | |
1da177e4 LT |
876 | if (!hcon) |
877 | goto done; | |
878 | ||
879 | conn = l2cap_conn_add(hcon, 0); | |
880 | if (!conn) { | |
881 | hci_conn_put(hcon); | |
882 | goto done; | |
883 | } | |
884 | ||
885 | err = 0; | |
886 | ||
887 | /* Update source addr of the socket */ | |
888 | bacpy(src, conn->src); | |
889 | ||
890 | l2cap_chan_add(conn, sk, NULL); | |
891 | ||
892 | sk->sk_state = BT_CONNECT; | |
893 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
894 | ||
895 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
896 | if (sk->sk_type != SOCK_SEQPACKET && |
897 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 898 | l2cap_sock_clear_timer(sk); |
d00ef24f JH |
899 | if (l2cap_check_security(sk)) |
900 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
901 | } else |
902 | l2cap_do_start(sk); | |
1da177e4 LT |
903 | } |
904 | ||
905 | done: | |
906 | hci_dev_unlock_bh(hdev); | |
907 | hci_dev_put(hdev); | |
908 | return err; | |
909 | } | |
910 | ||
65390587 | 911 | int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) |
1da177e4 | 912 | { |
1da177e4 | 913 | struct sock *sk = sock->sk; |
f29972de MH |
914 | struct sockaddr_l2 la; |
915 | int len, err = 0; | |
1da177e4 | 916 | |
1da177e4 LT |
917 | BT_DBG("sk %p", sk); |
918 | ||
6503d961 CG |
919 | if (!addr || alen < sizeof(addr->sa_family) || |
920 | addr->sa_family != AF_BLUETOOTH) | |
2a517ca6 | 921 | return -EINVAL; |
1da177e4 | 922 | |
f29972de MH |
923 | memset(&la, 0, sizeof(la)); |
924 | len = min_t(unsigned int, sizeof(la), alen); | |
925 | memcpy(&la, addr, len); | |
926 | ||
2a517ca6 MH |
927 | if (la.l2_cid) |
928 | return -EINVAL; | |
929 | ||
930 | lock_sock(sk); | |
931 | ||
bd3c9e25 GP |
932 | if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) |
933 | && !la.l2_psm) { | |
1da177e4 LT |
934 | err = -EINVAL; |
935 | goto done; | |
936 | } | |
937 | ||
c6b03cf9 MH |
938 | switch (l2cap_pi(sk)->mode) { |
939 | case L2CAP_MODE_BASIC: | |
940 | break; | |
941 | case L2CAP_MODE_ERTM: | |
f2fcfcd6 | 942 | case L2CAP_MODE_STREAMING: |
d1c4a17d | 943 | if (!disable_ertm) |
c6b03cf9 MH |
944 | break; |
945 | /* fall through */ | |
946 | default: | |
947 | err = -ENOTSUPP; | |
948 | goto done; | |
949 | } | |
950 | ||
af05b30b | 951 | switch (sk->sk_state) { |
1da177e4 LT |
952 | case BT_CONNECT: |
953 | case BT_CONNECT2: | |
954 | case BT_CONFIG: | |
955 | /* Already connecting */ | |
956 | goto wait; | |
957 | ||
958 | case BT_CONNECTED: | |
959 | /* Already connected */ | |
8b0dc6dc | 960 | err = -EISCONN; |
1da177e4 LT |
961 | goto done; |
962 | ||
963 | case BT_OPEN: | |
964 | case BT_BOUND: | |
965 | /* Can connect */ | |
966 | break; | |
967 | ||
968 | default: | |
969 | err = -EBADFD; | |
970 | goto done; | |
971 | } | |
972 | ||
0fba2558 MM |
973 | /* PSM must be odd and lsb of upper byte must be 0 */ |
974 | if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 && | |
975 | sk->sk_type != SOCK_RAW) { | |
976 | err = -EINVAL; | |
977 | goto done; | |
978 | } | |
979 | ||
1da177e4 | 980 | /* Set destination address and psm */ |
f29972de MH |
981 | bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); |
982 | l2cap_pi(sk)->psm = la.l2_psm; | |
1da177e4 | 983 | |
af05b30b GP |
984 | err = l2cap_do_connect(sk); |
985 | if (err) | |
1da177e4 LT |
986 | goto done; |
987 | ||
988 | wait: | |
989 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
990 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
991 | done: | |
992 | release_sock(sk); | |
993 | return err; | |
994 | } | |
995 | ||
65390587 | 996 | int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) |
1da177e4 LT |
997 | { |
998 | DECLARE_WAITQUEUE(wait, current); | |
999 | struct sock *sk = sock->sk, *nsk; | |
1000 | long timeo; | |
1001 | int err = 0; | |
1002 | ||
fcc70d5f | 1003 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1004 | |
1005 | if (sk->sk_state != BT_LISTEN) { | |
1006 | err = -EBADFD; | |
1007 | goto done; | |
1008 | } | |
1009 | ||
1010 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1011 | ||
1012 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
1013 | ||
1014 | /* Wait for an incoming connection. (wake-one). */ | |
aa395145 | 1015 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
1da177e4 LT |
1016 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { |
1017 | set_current_state(TASK_INTERRUPTIBLE); | |
1018 | if (!timeo) { | |
1019 | err = -EAGAIN; | |
1020 | break; | |
1021 | } | |
1022 | ||
1023 | release_sock(sk); | |
1024 | timeo = schedule_timeout(timeo); | |
fcc70d5f | 1025 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
1da177e4 LT |
1026 | |
1027 | if (sk->sk_state != BT_LISTEN) { | |
1028 | err = -EBADFD; | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | if (signal_pending(current)) { | |
1033 | err = sock_intr_errno(timeo); | |
1034 | break; | |
1035 | } | |
1036 | } | |
1037 | set_current_state(TASK_RUNNING); | |
aa395145 | 1038 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
1039 | |
1040 | if (err) | |
1041 | goto done; | |
1042 | ||
1043 | newsock->state = SS_CONNECTED; | |
1044 | ||
1045 | BT_DBG("new socket %p", nsk); | |
1046 | ||
1047 | done: | |
1048 | release_sock(sk); | |
1049 | return err; | |
1050 | } | |
1051 | ||
65390587 | 1052 | int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) |
1da177e4 LT |
1053 | { |
1054 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; | |
1055 | struct sock *sk = sock->sk; | |
1056 | ||
1057 | BT_DBG("sock %p, sk %p", sock, sk); | |
1058 | ||
1059 | addr->sa_family = AF_BLUETOOTH; | |
1060 | *len = sizeof(struct sockaddr_l2); | |
1061 | ||
f29972de MH |
1062 | if (peer) { |
1063 | la->l2_psm = l2cap_pi(sk)->psm; | |
1da177e4 | 1064 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); |
b4324b5d | 1065 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); |
f29972de MH |
1066 | } else { |
1067 | la->l2_psm = l2cap_pi(sk)->sport; | |
1da177e4 | 1068 | bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); |
b4324b5d | 1069 | la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); |
f29972de | 1070 | } |
1da177e4 | 1071 | |
1da177e4 LT |
1072 | return 0; |
1073 | } | |
1074 | ||
6161c038 GP |
1075 | static int __l2cap_wait_ack(struct sock *sk) |
1076 | { | |
1077 | DECLARE_WAITQUEUE(wait, current); | |
1078 | int err = 0; | |
1079 | int timeo = HZ/5; | |
1080 | ||
2b0b05dd | 1081 | add_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1082 | while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
1083 | set_current_state(TASK_INTERRUPTIBLE); | |
1084 | ||
1085 | if (!timeo) | |
1086 | timeo = HZ/5; | |
1087 | ||
1088 | if (signal_pending(current)) { | |
1089 | err = sock_intr_errno(timeo); | |
1090 | break; | |
1091 | } | |
1092 | ||
1093 | release_sock(sk); | |
1094 | timeo = schedule_timeout(timeo); | |
1095 | lock_sock(sk); | |
1096 | ||
1097 | err = sock_error(sk); | |
1098 | if (err) | |
1099 | break; | |
1100 | } | |
1101 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 1102 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
1103 | return err; |
1104 | } | |
1105 | ||
e90bac06 GP |
1106 | static void l2cap_monitor_timeout(unsigned long arg) |
1107 | { | |
1108 | struct sock *sk = (void *) arg; | |
e90bac06 | 1109 | |
0e98958d GP |
1110 | BT_DBG("sk %p", sk); |
1111 | ||
e686219a | 1112 | bh_lock_sock(sk); |
e90bac06 | 1113 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
9b108fc0 | 1114 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); |
b13f5860 | 1115 | bh_unlock_sock(sk); |
e90bac06 GP |
1116 | return; |
1117 | } | |
1118 | ||
1119 | l2cap_pi(sk)->retry_count++; | |
1120 | __mod_monitor_timer(); | |
1121 | ||
a2e12a2a | 1122 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1123 | bh_unlock_sock(sk); |
e90bac06 GP |
1124 | } |
1125 | ||
1126 | static void l2cap_retrans_timeout(unsigned long arg) | |
1127 | { | |
1128 | struct sock *sk = (void *) arg; | |
e90bac06 | 1129 | |
0e98958d GP |
1130 | BT_DBG("sk %p", sk); |
1131 | ||
e686219a | 1132 | bh_lock_sock(sk); |
e90bac06 GP |
1133 | l2cap_pi(sk)->retry_count = 1; |
1134 | __mod_monitor_timer(); | |
1135 | ||
1136 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
1137 | ||
a2e12a2a | 1138 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 1139 | bh_unlock_sock(sk); |
e90bac06 GP |
1140 | } |
1141 | ||
1c2acffb | 1142 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 1143 | { |
1c2acffb | 1144 | struct sk_buff *skb; |
1da177e4 | 1145 | |
812e737e GP |
1146 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
1147 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
1148 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
1149 | break; | |
1da177e4 | 1150 | |
1c2acffb GP |
1151 | skb = skb_dequeue(TX_QUEUE(sk)); |
1152 | kfree_skb(skb); | |
1da177e4 | 1153 | |
1c2acffb GP |
1154 | l2cap_pi(sk)->unacked_frames--; |
1155 | } | |
1da177e4 | 1156 | |
e90bac06 GP |
1157 | if (!l2cap_pi(sk)->unacked_frames) |
1158 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1c2acffb | 1159 | } |
1da177e4 | 1160 | |
9a9c6a34 | 1161 | static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
1162 | { |
1163 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
e702112f AE |
1164 | struct hci_conn *hcon = pi->conn->hcon; |
1165 | u16 flags; | |
1c2acffb GP |
1166 | |
1167 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 1168 | |
e702112f AE |
1169 | if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) |
1170 | flags = ACL_START_NO_FLUSH; | |
1171 | else | |
1172 | flags = ACL_START; | |
1173 | ||
1174 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1175 | } |
1176 | ||
305682e8 | 1177 | static void l2cap_streaming_send(struct sock *sk) |
6840ed07 | 1178 | { |
ccbb84af | 1179 | struct sk_buff *skb; |
6840ed07 | 1180 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1181 | u16 control, fcs; |
6840ed07 | 1182 | |
ccbb84af GP |
1183 | while ((skb = skb_dequeue(TX_QUEUE(sk)))) { |
1184 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); | |
6840ed07 | 1185 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1186 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1187 | |
e8235c6b | 1188 | if (pi->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1189 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1190 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1191 | } |
1192 | ||
ccbb84af | 1193 | l2cap_do_send(sk, skb); |
6840ed07 GP |
1194 | |
1195 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
6840ed07 | 1196 | } |
6840ed07 GP |
1197 | } |
1198 | ||
dfc909be | 1199 | static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) |
8f17154f GP |
1200 | { |
1201 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1202 | struct sk_buff *skb, *tx_skb; | |
1203 | u16 control, fcs; | |
8f17154f GP |
1204 | |
1205 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1206 | if (!skb) |
1207 | return; | |
8f17154f | 1208 | |
f11d676d GP |
1209 | do { |
1210 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1211 | break; |
8f17154f | 1212 | |
f11d676d GP |
1213 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1214 | return; | |
8f17154f | 1215 | |
f11d676d | 1216 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1217 | |
f11d676d GP |
1218 | if (pi->remote_max_tx && |
1219 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1220 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
f11d676d GP |
1221 | return; |
1222 | } | |
1223 | ||
1224 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1225 | bt_cb(skb)->retries++; | |
1226 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
3cb123d1 GP |
1227 | |
1228 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { | |
1229 | control |= L2CAP_CTRL_FINAL; | |
1230 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1231 | } | |
95ffa978 | 1232 | |
f11d676d GP |
1233 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1234 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
3cb123d1 | 1235 | |
f11d676d GP |
1236 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1237 | ||
1238 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1239 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1240 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1241 | } | |
1242 | ||
1243 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1244 | } |
1245 | ||
1c2acffb GP |
1246 | static int l2cap_ertm_send(struct sock *sk) |
1247 | { | |
1248 | struct sk_buff *skb, *tx_skb; | |
1249 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1250 | u16 control, fcs; |
9a9c6a34 | 1251 | int nsent = 0; |
1c2acffb | 1252 | |
c13ffa62 GP |
1253 | if (sk->sk_state != BT_CONNECTED) |
1254 | return -ENOTCONN; | |
e90bac06 | 1255 | |
6e2b6722 | 1256 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { |
1c2acffb | 1257 | |
e90bac06 GP |
1258 | if (pi->remote_max_tx && |
1259 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1260 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
e90bac06 GP |
1261 | break; |
1262 | } | |
1263 | ||
e420aba3 AE |
1264 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1265 | ||
e90bac06 GP |
1266 | bt_cb(skb)->retries++; |
1267 | ||
1c2acffb | 1268 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1269 | control &= L2CAP_CTRL_SAR; |
1270 | ||
d5392c8f GP |
1271 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1272 | control |= L2CAP_CTRL_FINAL; | |
1273 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1274 | } | |
9f121a5a | 1275 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1276 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1277 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1278 | ||
e90bac06 | 1279 | |
e8235c6b | 1280 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1281 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1282 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1283 | } | |
1284 | ||
9a9c6a34 GP |
1285 | l2cap_do_send(sk, tx_skb); |
1286 | ||
e90bac06 | 1287 | __mod_retrans_timer(); |
1c2acffb GP |
1288 | |
1289 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1290 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1291 | ||
1292 | pi->unacked_frames++; | |
d5392c8f | 1293 | pi->frames_sent++; |
1c2acffb GP |
1294 | |
1295 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1296 | sk->sk_send_head = NULL; | |
1297 | else | |
1298 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1299 | |
1300 | nsent++; | |
1c2acffb GP |
1301 | } |
1302 | ||
9e917af1 GP |
1303 | return nsent; |
1304 | } | |
1305 | ||
dfc909be GP |
1306 | static int l2cap_retransmit_frames(struct sock *sk) |
1307 | { | |
1308 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1309 | int ret; | |
1310 | ||
dfc909be GP |
1311 | if (!skb_queue_empty(TX_QUEUE(sk))) |
1312 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1313 | ||
1314 | pi->next_tx_seq = pi->expected_ack_seq; | |
1315 | ret = l2cap_ertm_send(sk); | |
dfc909be GP |
1316 | return ret; |
1317 | } | |
1318 | ||
9a9c6a34 | 1319 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1320 | { |
1321 | struct sock *sk = (struct sock *)pi; | |
1322 | u16 control = 0; | |
1323 | ||
1324 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1325 | ||
1326 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1327 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1328 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1329 | l2cap_send_sframe(pi, control); |
1330 | return; | |
9e917af1 | 1331 | } |
dfc909be | 1332 | |
e0f66218 | 1333 | if (l2cap_ertm_send(sk) > 0) |
dfc909be GP |
1334 | return; |
1335 | ||
1336 | control |= L2CAP_SUPER_RCV_READY; | |
1337 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1338 | } |
1339 | ||
9a9c6a34 | 1340 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1341 | { |
1342 | struct srej_list *tail; | |
1343 | u16 control; | |
1344 | ||
1345 | control = L2CAP_SUPER_SELECT_REJECT; | |
1346 | control |= L2CAP_CTRL_FINAL; | |
1347 | ||
1348 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1349 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1350 | ||
1351 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1352 | } |
1353 | ||
1c2acffb GP |
1354 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1355 | { | |
1356 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1357 | struct sk_buff **frag; | |
1358 | int err, sent = 0; | |
1da177e4 | 1359 | |
59203a21 | 1360 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1361 | return -EFAULT; |
1da177e4 LT |
1362 | |
1363 | sent += count; | |
1364 | len -= count; | |
1365 | ||
1366 | /* Continuation fragments (no L2CAP header) */ | |
1367 | frag = &skb_shinfo(skb)->frag_list; | |
1368 | while (len) { | |
1369 | count = min_t(unsigned int, conn->mtu, len); | |
1370 | ||
1371 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1372 | if (!*frag) | |
0175d629 | 1373 | return err; |
1c2acffb GP |
1374 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1375 | return -EFAULT; | |
1da177e4 LT |
1376 | |
1377 | sent += count; | |
1378 | len -= count; | |
1379 | ||
1380 | frag = &(*frag)->next; | |
1381 | } | |
1da177e4 LT |
1382 | |
1383 | return sent; | |
1c2acffb | 1384 | } |
1da177e4 | 1385 | |
1c2acffb GP |
1386 | static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1387 | { | |
1388 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1389 | struct sk_buff *skb; | |
1390 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1391 | struct l2cap_hdr *lh; | |
1392 | ||
1393 | BT_DBG("sk %p len %d", sk, (int)len); | |
1394 | ||
1395 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1396 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1397 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1398 | if (!skb) | |
0175d629 | 1399 | return ERR_PTR(err); |
1c2acffb GP |
1400 | |
1401 | /* Create L2CAP header */ | |
1402 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1403 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1404 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1405 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1406 | ||
1407 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1408 | if (unlikely(err < 0)) { | |
1409 | kfree_skb(skb); | |
1410 | return ERR_PTR(err); | |
1411 | } | |
1412 | return skb; | |
1413 | } | |
1414 | ||
1415 | static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) | |
1416 | { | |
1417 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1418 | struct sk_buff *skb; | |
1419 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1420 | struct l2cap_hdr *lh; | |
1421 | ||
1422 | BT_DBG("sk %p len %d", sk, (int)len); | |
1423 | ||
1424 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1425 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1426 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1427 | if (!skb) | |
0175d629 | 1428 | return ERR_PTR(err); |
1c2acffb GP |
1429 | |
1430 | /* Create L2CAP header */ | |
1431 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1432 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1433 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1434 | ||
1435 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1436 | if (unlikely(err < 0)) { | |
1437 | kfree_skb(skb); | |
1438 | return ERR_PTR(err); | |
1439 | } | |
1440 | return skb; | |
1441 | } | |
1442 | ||
6840ed07 | 1443 | static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1444 | { |
1445 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1446 | struct sk_buff *skb; | |
1447 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1448 | struct l2cap_hdr *lh; | |
1449 | ||
1450 | BT_DBG("sk %p len %d", sk, (int)len); | |
1451 | ||
0ee0d208 GP |
1452 | if (!conn) |
1453 | return ERR_PTR(-ENOTCONN); | |
1454 | ||
c74e560c GP |
1455 | if (sdulen) |
1456 | hlen += 2; | |
1457 | ||
fcc203c3 GP |
1458 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1459 | hlen += 2; | |
1460 | ||
1c2acffb GP |
1461 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1462 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1463 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1464 | if (!skb) | |
0175d629 | 1465 | return ERR_PTR(err); |
1c2acffb GP |
1466 | |
1467 | /* Create L2CAP header */ | |
1468 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1469 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1470 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1471 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1472 | if (sdulen) |
1473 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1474 | |
1475 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1476 | if (unlikely(err < 0)) { | |
1477 | kfree_skb(skb); | |
1478 | return ERR_PTR(err); | |
1479 | } | |
e90bac06 | 1480 | |
fcc203c3 GP |
1481 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1482 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1483 | ||
e90bac06 | 1484 | bt_cb(skb)->retries = 0; |
1c2acffb | 1485 | return skb; |
1da177e4 LT |
1486 | } |
1487 | ||
c74e560c GP |
1488 | static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
1489 | { | |
1490 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1491 | struct sk_buff *skb; | |
1492 | struct sk_buff_head sar_queue; | |
1493 | u16 control; | |
1494 | size_t size = 0; | |
1495 | ||
ff12fd64 | 1496 | skb_queue_head_init(&sar_queue); |
c74e560c | 1497 | control = L2CAP_SDU_START; |
1c762159 | 1498 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1499 | if (IS_ERR(skb)) |
1500 | return PTR_ERR(skb); | |
1501 | ||
1502 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1503 | len -= pi->remote_mps; |
1504 | size += pi->remote_mps; | |
c74e560c GP |
1505 | |
1506 | while (len > 0) { | |
1507 | size_t buflen; | |
1508 | ||
1c762159 | 1509 | if (len > pi->remote_mps) { |
44651b85 | 1510 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1511 | buflen = pi->remote_mps; |
c74e560c | 1512 | } else { |
44651b85 | 1513 | control = L2CAP_SDU_END; |
c74e560c GP |
1514 | buflen = len; |
1515 | } | |
1516 | ||
6840ed07 | 1517 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1518 | if (IS_ERR(skb)) { |
1519 | skb_queue_purge(&sar_queue); | |
1520 | return PTR_ERR(skb); | |
1521 | } | |
1522 | ||
1523 | __skb_queue_tail(&sar_queue, skb); | |
1524 | len -= buflen; | |
1525 | size += buflen; | |
c74e560c GP |
1526 | } |
1527 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1528 | if (sk->sk_send_head == NULL) | |
1529 | sk->sk_send_head = sar_queue.next; | |
1530 | ||
1531 | return size; | |
1532 | } | |
1533 | ||
65390587 | 1534 | int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
1535 | { |
1536 | struct sock *sk = sock->sk; | |
1c2acffb GP |
1537 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1538 | struct sk_buff *skb; | |
1539 | u16 control; | |
1540 | int err; | |
1da177e4 LT |
1541 | |
1542 | BT_DBG("sock %p, sk %p", sock, sk); | |
1543 | ||
c1cbe4b7 BL |
1544 | err = sock_error(sk); |
1545 | if (err) | |
1546 | return err; | |
1da177e4 LT |
1547 | |
1548 | if (msg->msg_flags & MSG_OOB) | |
1549 | return -EOPNOTSUPP; | |
1550 | ||
1da177e4 LT |
1551 | lock_sock(sk); |
1552 | ||
1c2acffb | 1553 | if (sk->sk_state != BT_CONNECTED) { |
1da177e4 | 1554 | err = -ENOTCONN; |
1c2acffb GP |
1555 | goto done; |
1556 | } | |
1da177e4 | 1557 | |
1c2acffb GP |
1558 | /* Connectionless channel */ |
1559 | if (sk->sk_type == SOCK_DGRAM) { | |
1560 | skb = l2cap_create_connless_pdu(sk, msg, len); | |
9a9c6a34 | 1561 | if (IS_ERR(skb)) { |
477fffb0 | 1562 | err = PTR_ERR(skb); |
9a9c6a34 GP |
1563 | } else { |
1564 | l2cap_do_send(sk, skb); | |
1565 | err = len; | |
1566 | } | |
1c2acffb GP |
1567 | goto done; |
1568 | } | |
1569 | ||
1570 | switch (pi->mode) { | |
1571 | case L2CAP_MODE_BASIC: | |
c69163e9 GP |
1572 | /* Check outgoing MTU */ |
1573 | if (len > pi->omtu) { | |
f9dd11b0 | 1574 | err = -EMSGSIZE; |
c69163e9 GP |
1575 | goto done; |
1576 | } | |
1577 | ||
1c2acffb GP |
1578 | /* Create a basic PDU */ |
1579 | skb = l2cap_create_basic_pdu(sk, msg, len); | |
1580 | if (IS_ERR(skb)) { | |
1581 | err = PTR_ERR(skb); | |
1582 | goto done; | |
1583 | } | |
1584 | ||
9a9c6a34 GP |
1585 | l2cap_do_send(sk, skb); |
1586 | err = len; | |
1c2acffb GP |
1587 | break; |
1588 | ||
1589 | case L2CAP_MODE_ERTM: | |
6840ed07 | 1590 | case L2CAP_MODE_STREAMING: |
1c2acffb | 1591 | /* Entire SDU fits into one PDU */ |
1c762159 | 1592 | if (len <= pi->remote_mps) { |
1c2acffb | 1593 | control = L2CAP_SDU_UNSEGMENTED; |
6840ed07 | 1594 | skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); |
1c2acffb GP |
1595 | if (IS_ERR(skb)) { |
1596 | err = PTR_ERR(skb); | |
1597 | goto done; | |
1598 | } | |
c74e560c | 1599 | __skb_queue_tail(TX_QUEUE(sk), skb); |
dfc909be | 1600 | |
c74e560c GP |
1601 | if (sk->sk_send_head == NULL) |
1602 | sk->sk_send_head = skb; | |
dfc909be | 1603 | |
1c2acffb | 1604 | } else { |
c74e560c GP |
1605 | /* Segment SDU into multiples PDUs */ |
1606 | err = l2cap_sar_segment_sdu(sk, msg, len); | |
1607 | if (err < 0) | |
1608 | goto done; | |
1c2acffb | 1609 | } |
1c2acffb | 1610 | |
dfc909be | 1611 | if (pi->mode == L2CAP_MODE_STREAMING) { |
305682e8 | 1612 | l2cap_streaming_send(sk); |
dfc909be | 1613 | } else { |
4571928f DS |
1614 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
1615 | (pi->conn_state & L2CAP_CONN_WAIT_F)) { | |
6e2b6722 GP |
1616 | err = len; |
1617 | break; | |
1618 | } | |
6840ed07 | 1619 | err = l2cap_ertm_send(sk); |
dfc909be | 1620 | } |
6840ed07 | 1621 | |
9e917af1 | 1622 | if (err >= 0) |
1c2acffb GP |
1623 | err = len; |
1624 | break; | |
1625 | ||
1626 | default: | |
1627 | BT_DBG("bad state %1.1x", pi->mode); | |
bc766db2 | 1628 | err = -EBADFD; |
1c2acffb GP |
1629 | } |
1630 | ||
1631 | done: | |
1da177e4 LT |
1632 | release_sock(sk); |
1633 | return err; | |
1634 | } | |
1635 | ||
65390587 | 1636 | int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) |
f66dc81f MH |
1637 | { |
1638 | struct sock *sk = sock->sk; | |
1639 | ||
1640 | lock_sock(sk); | |
1641 | ||
1642 | if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { | |
1643 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd GP |
1644 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1645 | u8 buf[128]; | |
f66dc81f MH |
1646 | |
1647 | sk->sk_state = BT_CONFIG; | |
1648 | ||
1649 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1650 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1651 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1652 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1653 | l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, | |
1654 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1655 | ||
e9aeb2dd GP |
1656 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) { |
1657 | release_sock(sk); | |
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
1662 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
1663 | l2cap_build_conf_req(sk, buf), buf); | |
1664 | l2cap_pi(sk)->num_conf_req++; | |
1665 | ||
f66dc81f MH |
1666 | release_sock(sk); |
1667 | return 0; | |
1668 | } | |
1669 | ||
1670 | release_sock(sk); | |
1671 | ||
6fdf482b MM |
1672 | if (sock->type == SOCK_STREAM) |
1673 | return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags); | |
1674 | ||
f66dc81f MH |
1675 | return bt_sock_recvmsg(iocb, sock, msg, len, flags); |
1676 | } | |
1677 | ||
b7058842 | 1678 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1679 | { |
1680 | struct sock *sk = sock->sk; | |
1681 | struct l2cap_options opts; | |
f29972de | 1682 | int len, err = 0; |
1da177e4 LT |
1683 | u32 opt; |
1684 | ||
1685 | BT_DBG("sk %p", sk); | |
1686 | ||
1687 | lock_sock(sk); | |
1688 | ||
1689 | switch (optname) { | |
1690 | case L2CAP_OPTIONS: | |
eaa71b31 GP |
1691 | if (sk->sk_state == BT_CONNECTED) { |
1692 | err = -EINVAL; | |
1693 | break; | |
1694 | } | |
1695 | ||
0878b666 MH |
1696 | opts.imtu = l2cap_pi(sk)->imtu; |
1697 | opts.omtu = l2cap_pi(sk)->omtu; | |
1698 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1699 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1700 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1701 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1702 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
0878b666 | 1703 | |
1da177e4 LT |
1704 | len = min_t(unsigned int, sizeof(opts), optlen); |
1705 | if (copy_from_user((char *) &opts, optval, len)) { | |
1706 | err = -EFAULT; | |
1707 | break; | |
1708 | } | |
0878b666 | 1709 | |
45d65c46 GP |
1710 | if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { |
1711 | err = -EINVAL; | |
1712 | break; | |
1713 | } | |
1714 | ||
0041ecfa JPRV |
1715 | l2cap_pi(sk)->mode = opts.mode; |
1716 | switch (l2cap_pi(sk)->mode) { | |
1717 | case L2CAP_MODE_BASIC: | |
85eb53c6 | 1718 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; |
0041ecfa JPRV |
1719 | break; |
1720 | case L2CAP_MODE_ERTM: | |
1721 | case L2CAP_MODE_STREAMING: | |
d1c4a17d | 1722 | if (!disable_ertm) |
0041ecfa JPRV |
1723 | break; |
1724 | /* fall through */ | |
1725 | default: | |
1726 | err = -EINVAL; | |
1727 | break; | |
1728 | } | |
1729 | ||
c6b03cf9 MH |
1730 | l2cap_pi(sk)->imtu = opts.imtu; |
1731 | l2cap_pi(sk)->omtu = opts.omtu; | |
fcc203c3 | 1732 | l2cap_pi(sk)->fcs = opts.fcs; |
68d7f0ce | 1733 | l2cap_pi(sk)->max_tx = opts.max_tx; |
14b5aa71 | 1734 | l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; |
1da177e4 LT |
1735 | break; |
1736 | ||
1737 | case L2CAP_LM: | |
1738 | if (get_user(opt, (u32 __user *) optval)) { | |
1739 | err = -EFAULT; | |
1740 | break; | |
1741 | } | |
1742 | ||
2af6b9d5 MH |
1743 | if (opt & L2CAP_LM_AUTH) |
1744 | l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; | |
1745 | if (opt & L2CAP_LM_ENCRYPT) | |
1746 | l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; | |
1747 | if (opt & L2CAP_LM_SECURE) | |
1748 | l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; | |
1749 | ||
1750 | l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); | |
1751 | l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); | |
1da177e4 LT |
1752 | break; |
1753 | ||
1754 | default: | |
1755 | err = -ENOPROTOOPT; | |
1756 | break; | |
1757 | } | |
1758 | ||
1759 | release_sock(sk); | |
1760 | return err; | |
1761 | } | |
1762 | ||
65390587 | 1763 | int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
d58daf42 MH |
1764 | { |
1765 | struct sock *sk = sock->sk; | |
2af6b9d5 MH |
1766 | struct bt_security sec; |
1767 | int len, err = 0; | |
f66dc81f | 1768 | u32 opt; |
d58daf42 MH |
1769 | |
1770 | BT_DBG("sk %p", sk); | |
1771 | ||
1772 | if (level == SOL_L2CAP) | |
1773 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); | |
1774 | ||
0588d94f MH |
1775 | if (level != SOL_BLUETOOTH) |
1776 | return -ENOPROTOOPT; | |
1777 | ||
d58daf42 MH |
1778 | lock_sock(sk); |
1779 | ||
1780 | switch (optname) { | |
2af6b9d5 | 1781 | case BT_SECURITY: |
bd3c9e25 GP |
1782 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
1783 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
1784 | err = -EINVAL; |
1785 | break; | |
1786 | } | |
1787 | ||
2af6b9d5 MH |
1788 | sec.level = BT_SECURITY_LOW; |
1789 | ||
1790 | len = min_t(unsigned int, sizeof(sec), optlen); | |
1791 | if (copy_from_user((char *) &sec, optval, len)) { | |
1792 | err = -EFAULT; | |
1793 | break; | |
1794 | } | |
1795 | ||
1796 | if (sec.level < BT_SECURITY_LOW || | |
1797 | sec.level > BT_SECURITY_HIGH) { | |
1798 | err = -EINVAL; | |
1799 | break; | |
1800 | } | |
1801 | ||
1802 | l2cap_pi(sk)->sec_level = sec.level; | |
1803 | break; | |
1804 | ||
f66dc81f MH |
1805 | case BT_DEFER_SETUP: |
1806 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
1807 | err = -EINVAL; | |
1808 | break; | |
1809 | } | |
1810 | ||
1811 | if (get_user(opt, (u32 __user *) optval)) { | |
1812 | err = -EFAULT; | |
1813 | break; | |
1814 | } | |
1815 | ||
1816 | bt_sk(sk)->defer_setup = opt; | |
1817 | break; | |
1818 | ||
e702112f AE |
1819 | case BT_FLUSHABLE: |
1820 | if (get_user(opt, (u32 __user *) optval)) { | |
1821 | err = -EFAULT; | |
1822 | break; | |
1823 | } | |
1824 | ||
1825 | if (opt > BT_FLUSHABLE_ON) { | |
1826 | err = -EINVAL; | |
1827 | break; | |
1828 | } | |
1829 | ||
1830 | if (opt == BT_FLUSHABLE_OFF) { | |
1831 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1832 | /* proceed futher only when we have l2cap_conn and | |
1833 | No Flush support in the LM */ | |
1834 | if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) { | |
1835 | err = -EINVAL; | |
1836 | break; | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | l2cap_pi(sk)->flushable = opt; | |
1841 | break; | |
1842 | ||
d58daf42 MH |
1843 | default: |
1844 | err = -ENOPROTOOPT; | |
1845 | break; | |
1846 | } | |
1847 | ||
1848 | release_sock(sk); | |
1849 | return err; | |
1850 | } | |
1851 | ||
1852 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) | |
1da177e4 LT |
1853 | { |
1854 | struct sock *sk = sock->sk; | |
1855 | struct l2cap_options opts; | |
1856 | struct l2cap_conninfo cinfo; | |
1857 | int len, err = 0; | |
2af6b9d5 | 1858 | u32 opt; |
1da177e4 LT |
1859 | |
1860 | BT_DBG("sk %p", sk); | |
1861 | ||
1862 | if (get_user(len, optlen)) | |
1863 | return -EFAULT; | |
1864 | ||
1865 | lock_sock(sk); | |
1866 | ||
1867 | switch (optname) { | |
1868 | case L2CAP_OPTIONS: | |
1869 | opts.imtu = l2cap_pi(sk)->imtu; | |
1870 | opts.omtu = l2cap_pi(sk)->omtu; | |
1871 | opts.flush_to = l2cap_pi(sk)->flush_to; | |
c6b03cf9 | 1872 | opts.mode = l2cap_pi(sk)->mode; |
fcc203c3 | 1873 | opts.fcs = l2cap_pi(sk)->fcs; |
68d7f0ce | 1874 | opts.max_tx = l2cap_pi(sk)->max_tx; |
14b5aa71 | 1875 | opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; |
1da177e4 LT |
1876 | |
1877 | len = min_t(unsigned int, len, sizeof(opts)); | |
1878 | if (copy_to_user(optval, (char *) &opts, len)) | |
1879 | err = -EFAULT; | |
1880 | ||
1881 | break; | |
1882 | ||
1883 | case L2CAP_LM: | |
2af6b9d5 MH |
1884 | switch (l2cap_pi(sk)->sec_level) { |
1885 | case BT_SECURITY_LOW: | |
1886 | opt = L2CAP_LM_AUTH; | |
1887 | break; | |
1888 | case BT_SECURITY_MEDIUM: | |
1889 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; | |
1890 | break; | |
1891 | case BT_SECURITY_HIGH: | |
1892 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | | |
1893 | L2CAP_LM_SECURE; | |
1894 | break; | |
1895 | default: | |
1896 | opt = 0; | |
1897 | break; | |
1898 | } | |
1899 | ||
1900 | if (l2cap_pi(sk)->role_switch) | |
1901 | opt |= L2CAP_LM_MASTER; | |
1902 | ||
1903 | if (l2cap_pi(sk)->force_reliable) | |
1904 | opt |= L2CAP_LM_RELIABLE; | |
1905 | ||
1906 | if (put_user(opt, (u32 __user *) optval)) | |
1da177e4 LT |
1907 | err = -EFAULT; |
1908 | break; | |
1909 | ||
1910 | case L2CAP_CONNINFO: | |
f66dc81f MH |
1911 | if (sk->sk_state != BT_CONNECTED && |
1912 | !(sk->sk_state == BT_CONNECT2 && | |
1913 | bt_sk(sk)->defer_setup)) { | |
1da177e4 LT |
1914 | err = -ENOTCONN; |
1915 | break; | |
1916 | } | |
1917 | ||
1918 | cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; | |
1919 | memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); | |
1920 | ||
1921 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
1922 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
1923 | err = -EFAULT; | |
1924 | ||
1925 | break; | |
1926 | ||
1927 | default: | |
1928 | err = -ENOPROTOOPT; | |
1929 | break; | |
1930 | } | |
1931 | ||
1932 | release_sock(sk); | |
1933 | return err; | |
1934 | } | |
1935 | ||
65390587 | 1936 | int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) |
d58daf42 MH |
1937 | { |
1938 | struct sock *sk = sock->sk; | |
2af6b9d5 | 1939 | struct bt_security sec; |
d58daf42 MH |
1940 | int len, err = 0; |
1941 | ||
1942 | BT_DBG("sk %p", sk); | |
1943 | ||
1944 | if (level == SOL_L2CAP) | |
1945 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); | |
1946 | ||
0588d94f MH |
1947 | if (level != SOL_BLUETOOTH) |
1948 | return -ENOPROTOOPT; | |
1949 | ||
d58daf42 MH |
1950 | if (get_user(len, optlen)) |
1951 | return -EFAULT; | |
1952 | ||
1953 | lock_sock(sk); | |
1954 | ||
1955 | switch (optname) { | |
2af6b9d5 | 1956 | case BT_SECURITY: |
bd3c9e25 GP |
1957 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
1958 | && sk->sk_type != SOCK_RAW) { | |
0588d94f MH |
1959 | err = -EINVAL; |
1960 | break; | |
1961 | } | |
1962 | ||
2af6b9d5 MH |
1963 | sec.level = l2cap_pi(sk)->sec_level; |
1964 | ||
1965 | len = min_t(unsigned int, len, sizeof(sec)); | |
1966 | if (copy_to_user(optval, (char *) &sec, len)) | |
1967 | err = -EFAULT; | |
1968 | ||
1969 | break; | |
1970 | ||
f66dc81f MH |
1971 | case BT_DEFER_SETUP: |
1972 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { | |
1973 | err = -EINVAL; | |
1974 | break; | |
1975 | } | |
1976 | ||
1977 | if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) | |
1978 | err = -EFAULT; | |
1979 | ||
1980 | break; | |
1981 | ||
e702112f AE |
1982 | case BT_FLUSHABLE: |
1983 | if (put_user(l2cap_pi(sk)->flushable, (u32 __user *) optval)) | |
1984 | err = -EFAULT; | |
1985 | ||
1986 | break; | |
1987 | ||
d58daf42 MH |
1988 | default: |
1989 | err = -ENOPROTOOPT; | |
1990 | break; | |
1991 | } | |
1992 | ||
1993 | release_sock(sk); | |
1994 | return err; | |
1995 | } | |
1996 | ||
65390587 | 1997 | int l2cap_sock_shutdown(struct socket *sock, int how) |
1da177e4 LT |
1998 | { |
1999 | struct sock *sk = sock->sk; | |
2000 | int err = 0; | |
2001 | ||
2002 | BT_DBG("sock %p, sk %p", sock, sk); | |
2003 | ||
2004 | if (!sk) | |
2005 | return 0; | |
2006 | ||
2007 | lock_sock(sk); | |
2008 | if (!sk->sk_shutdown) { | |
6161c038 GP |
2009 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2010 | err = __l2cap_wait_ack(sk); | |
2011 | ||
1da177e4 LT |
2012 | sk->sk_shutdown = SHUTDOWN_MASK; |
2013 | l2cap_sock_clear_timer(sk); | |
2014 | __l2cap_sock_close(sk, 0); | |
2015 | ||
2016 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
b1235d79 MH |
2017 | err = bt_sock_wait_state(sk, BT_CLOSED, |
2018 | sk->sk_lingertime); | |
1da177e4 | 2019 | } |
9b108fc0 GP |
2020 | |
2021 | if (!err && sk->sk_err) | |
2022 | err = -sk->sk_err; | |
2023 | ||
1da177e4 LT |
2024 | release_sock(sk); |
2025 | return err; | |
2026 | } | |
2027 | ||
1da177e4 LT |
2028 | static void l2cap_chan_ready(struct sock *sk) |
2029 | { | |
2030 | struct sock *parent = bt_sk(sk)->parent; | |
2031 | ||
2032 | BT_DBG("sk %p, parent %p", sk, parent); | |
2033 | ||
2034 | l2cap_pi(sk)->conf_state = 0; | |
2035 | l2cap_sock_clear_timer(sk); | |
2036 | ||
2037 | if (!parent) { | |
2038 | /* Outgoing channel. | |
2039 | * Wake up socket sleeping on connect. | |
2040 | */ | |
2041 | sk->sk_state = BT_CONNECTED; | |
2042 | sk->sk_state_change(sk); | |
2043 | } else { | |
2044 | /* Incoming channel. | |
2045 | * Wake up socket sleeping on accept. | |
2046 | */ | |
2047 | parent->sk_data_ready(parent, 0); | |
2048 | } | |
2049 | } | |
2050 | ||
2051 | /* Copy frame to all raw sockets on that connection */ | |
2052 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
2053 | { | |
2054 | struct l2cap_chan_list *l = &conn->chan_list; | |
2055 | struct sk_buff *nskb; | |
af05b30b | 2056 | struct sock *sk; |
1da177e4 LT |
2057 | |
2058 | BT_DBG("conn %p", conn); | |
2059 | ||
2060 | read_lock(&l->lock); | |
2061 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2062 | if (sk->sk_type != SOCK_RAW) | |
2063 | continue; | |
2064 | ||
2065 | /* Don't send frame to the socket it came from */ | |
2066 | if (skb->sk == sk) | |
2067 | continue; | |
af05b30b GP |
2068 | nskb = skb_clone(skb, GFP_ATOMIC); |
2069 | if (!nskb) | |
1da177e4 LT |
2070 | continue; |
2071 | ||
2072 | if (sock_queue_rcv_skb(sk, nskb)) | |
2073 | kfree_skb(nskb); | |
2074 | } | |
2075 | read_unlock(&l->lock); | |
2076 | } | |
2077 | ||
2078 | /* ---- L2CAP signalling commands ---- */ | |
2079 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
2080 | u8 code, u8 ident, u16 dlen, void *data) | |
2081 | { | |
2082 | struct sk_buff *skb, **frag; | |
2083 | struct l2cap_cmd_hdr *cmd; | |
2084 | struct l2cap_hdr *lh; | |
2085 | int len, count; | |
2086 | ||
af05b30b GP |
2087 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
2088 | conn, code, ident, dlen); | |
1da177e4 LT |
2089 | |
2090 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
2091 | count = min_t(unsigned int, conn->mtu, len); | |
2092 | ||
2093 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
2094 | if (!skb) | |
2095 | return NULL; | |
2096 | ||
2097 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 2098 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
8db4dc46 | 2099 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); |
1da177e4 LT |
2100 | |
2101 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
2102 | cmd->code = code; | |
2103 | cmd->ident = ident; | |
aca3192c | 2104 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
2105 | |
2106 | if (dlen) { | |
2107 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
2108 | memcpy(skb_put(skb, count), data, count); | |
2109 | data += count; | |
2110 | } | |
2111 | ||
2112 | len -= skb->len; | |
2113 | ||
2114 | /* Continuation fragments (no L2CAP header) */ | |
2115 | frag = &skb_shinfo(skb)->frag_list; | |
2116 | while (len) { | |
2117 | count = min_t(unsigned int, conn->mtu, len); | |
2118 | ||
2119 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
2120 | if (!*frag) | |
2121 | goto fail; | |
2122 | ||
2123 | memcpy(skb_put(*frag, count), data, count); | |
2124 | ||
2125 | len -= count; | |
2126 | data += count; | |
2127 | ||
2128 | frag = &(*frag)->next; | |
2129 | } | |
2130 | ||
2131 | return skb; | |
2132 | ||
2133 | fail: | |
2134 | kfree_skb(skb); | |
2135 | return NULL; | |
2136 | } | |
2137 | ||
2138 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
2139 | { | |
2140 | struct l2cap_conf_opt *opt = *ptr; | |
2141 | int len; | |
2142 | ||
2143 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
2144 | *ptr += len; | |
2145 | ||
2146 | *type = opt->type; | |
2147 | *olen = opt->len; | |
2148 | ||
2149 | switch (opt->len) { | |
2150 | case 1: | |
2151 | *val = *((u8 *) opt->val); | |
2152 | break; | |
2153 | ||
2154 | case 2: | |
bfaaeb3e | 2155 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
2156 | break; |
2157 | ||
2158 | case 4: | |
bfaaeb3e | 2159 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
2160 | break; |
2161 | ||
2162 | default: | |
2163 | *val = (unsigned long) opt->val; | |
2164 | break; | |
2165 | } | |
2166 | ||
2167 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
2168 | return len; | |
2169 | } | |
2170 | ||
1da177e4 LT |
2171 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
2172 | { | |
2173 | struct l2cap_conf_opt *opt = *ptr; | |
2174 | ||
2175 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
2176 | ||
2177 | opt->type = type; | |
2178 | opt->len = len; | |
2179 | ||
2180 | switch (len) { | |
2181 | case 1: | |
2182 | *((u8 *) opt->val) = val; | |
2183 | break; | |
2184 | ||
2185 | case 2: | |
4f8b691c | 2186 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
2187 | break; |
2188 | ||
2189 | case 4: | |
4f8b691c | 2190 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
2191 | break; |
2192 | ||
2193 | default: | |
2194 | memcpy(opt->val, (void *) val, len); | |
2195 | break; | |
2196 | } | |
2197 | ||
2198 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
2199 | } | |
2200 | ||
c1b4f43b GP |
2201 | static void l2cap_ack_timeout(unsigned long arg) |
2202 | { | |
2203 | struct sock *sk = (void *) arg; | |
2204 | ||
2205 | bh_lock_sock(sk); | |
2206 | l2cap_send_ack(l2cap_pi(sk)); | |
2207 | bh_unlock_sock(sk); | |
2208 | } | |
2209 | ||
0565c1c2 GP |
2210 | static inline void l2cap_ertm_init(struct sock *sk) |
2211 | { | |
2212 | l2cap_pi(sk)->expected_ack_seq = 0; | |
2213 | l2cap_pi(sk)->unacked_frames = 0; | |
2214 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 2215 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 2216 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
2217 | |
2218 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
2219 | l2cap_retrans_timeout, (unsigned long) sk); | |
2220 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
2221 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
2222 | setup_timer(&l2cap_pi(sk)->ack_timer, |
2223 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
2224 | |
2225 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b GP |
2226 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
2227 | ||
2228 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
218bb9df GP |
2229 | |
2230 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
2231 | } |
2232 | ||
f2fcfcd6 GP |
2233 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
2234 | { | |
2235 | switch (mode) { | |
2236 | case L2CAP_MODE_STREAMING: | |
2237 | case L2CAP_MODE_ERTM: | |
2238 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
2239 | return mode; | |
2240 | /* fall through */ | |
2241 | default: | |
2242 | return L2CAP_MODE_BASIC; | |
2243 | } | |
2244 | } | |
2245 | ||
1da177e4 LT |
2246 | static int l2cap_build_conf_req(struct sock *sk, void *data) |
2247 | { | |
2248 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2249 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 2250 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
2251 | void *ptr = req->data; |
2252 | ||
2253 | BT_DBG("sk %p", sk); | |
2254 | ||
f2fcfcd6 GP |
2255 | if (pi->num_conf_req || pi->num_conf_rsp) |
2256 | goto done; | |
2257 | ||
2258 | switch (pi->mode) { | |
2259 | case L2CAP_MODE_STREAMING: | |
2260 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 2261 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 2262 | break; |
85eb53c6 | 2263 | |
2ba13ed6 | 2264 | /* fall through */ |
f2fcfcd6 GP |
2265 | default: |
2266 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
2267 | break; | |
2268 | } | |
2269 | ||
2270 | done: | |
7990681c GP |
2271 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
2272 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
2273 | ||
65c7c491 MH |
2274 | switch (pi->mode) { |
2275 | case L2CAP_MODE_BASIC: | |
63406504 GP |
2276 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
2277 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
2278 | break; | |
2279 | ||
62547752 GP |
2280 | rfc.mode = L2CAP_MODE_BASIC; |
2281 | rfc.txwin_size = 0; | |
2282 | rfc.max_transmit = 0; | |
2283 | rfc.retrans_timeout = 0; | |
2284 | rfc.monitor_timeout = 0; | |
2285 | rfc.max_pdu_size = 0; | |
2286 | ||
63406504 GP |
2287 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2288 | (unsigned long) &rfc); | |
65c7c491 MH |
2289 | break; |
2290 | ||
2291 | case L2CAP_MODE_ERTM: | |
2292 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 2293 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 2294 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
2295 | rfc.retrans_timeout = 0; |
2296 | rfc.monitor_timeout = 0; | |
c74e560c | 2297 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2298 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2299 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 2300 | |
63406504 GP |
2301 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2302 | (unsigned long) &rfc); | |
2303 | ||
fcc203c3 GP |
2304 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2305 | break; | |
2306 | ||
2307 | if (pi->fcs == L2CAP_FCS_NONE || | |
2308 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2309 | pi->fcs = L2CAP_FCS_NONE; | |
2310 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2311 | } | |
f2fcfcd6 GP |
2312 | break; |
2313 | ||
2314 | case L2CAP_MODE_STREAMING: | |
2315 | rfc.mode = L2CAP_MODE_STREAMING; | |
2316 | rfc.txwin_size = 0; | |
2317 | rfc.max_transmit = 0; | |
2318 | rfc.retrans_timeout = 0; | |
2319 | rfc.monitor_timeout = 0; | |
c74e560c | 2320 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 2321 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 2322 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 2323 | |
63406504 GP |
2324 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
2325 | (unsigned long) &rfc); | |
2326 | ||
fcc203c3 GP |
2327 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
2328 | break; | |
2329 | ||
2330 | if (pi->fcs == L2CAP_FCS_NONE || | |
2331 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
2332 | pi->fcs = L2CAP_FCS_NONE; | |
2333 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
2334 | } | |
65c7c491 MH |
2335 | break; |
2336 | } | |
1da177e4 LT |
2337 | |
2338 | /* FIXME: Need actual value of the flush timeout */ | |
2339 | //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) | |
2340 | // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); | |
2341 | ||
aca3192c YH |
2342 | req->dcid = cpu_to_le16(pi->dcid); |
2343 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
2344 | |
2345 | return ptr - data; | |
2346 | } | |
2347 | ||
5dee9e7c | 2348 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
2349 | { |
2350 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
2351 | struct l2cap_conf_rsp *rsp = data; |
2352 | void *ptr = rsp->data; | |
2353 | void *req = pi->conf_req; | |
2354 | int len = pi->conf_len; | |
2355 | int type, hint, olen; | |
2356 | unsigned long val; | |
6464f35f | 2357 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 2358 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 2359 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 2360 | |
5dee9e7c | 2361 | BT_DBG("sk %p", sk); |
820ae1b8 | 2362 | |
5dee9e7c MH |
2363 | while (len >= L2CAP_CONF_OPT_SIZE) { |
2364 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 2365 | |
589d2746 | 2366 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 2367 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
2368 | |
2369 | switch (type) { | |
2370 | case L2CAP_CONF_MTU: | |
861d6882 | 2371 | mtu = val; |
5dee9e7c MH |
2372 | break; |
2373 | ||
2374 | case L2CAP_CONF_FLUSH_TO: | |
2375 | pi->flush_to = val; | |
2376 | break; | |
2377 | ||
2378 | case L2CAP_CONF_QOS: | |
2379 | break; | |
2380 | ||
6464f35f MH |
2381 | case L2CAP_CONF_RFC: |
2382 | if (olen == sizeof(rfc)) | |
2383 | memcpy(&rfc, (void *) val, olen); | |
2384 | break; | |
2385 | ||
fcc203c3 GP |
2386 | case L2CAP_CONF_FCS: |
2387 | if (val == L2CAP_FCS_NONE) | |
2388 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
2389 | ||
2390 | break; | |
2391 | ||
5dee9e7c MH |
2392 | default: |
2393 | if (hint) | |
2394 | break; | |
2395 | ||
2396 | result = L2CAP_CONF_UNKNOWN; | |
2397 | *((u8 *) ptr++) = type; | |
2398 | break; | |
2399 | } | |
2400 | } | |
2401 | ||
e9aeb2dd | 2402 | if (pi->num_conf_rsp || pi->num_conf_req > 1) |
f2fcfcd6 GP |
2403 | goto done; |
2404 | ||
2405 | switch (pi->mode) { | |
2406 | case L2CAP_MODE_STREAMING: | |
2407 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
2408 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
2409 | pi->mode = l2cap_select_mode(rfc.mode, | |
2410 | pi->conn->feat_mask); | |
2411 | break; | |
2412 | } | |
2413 | ||
742e519b | 2414 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 2415 | return -ECONNREFUSED; |
742e519b | 2416 | |
f2fcfcd6 | 2417 | break; |
f2fcfcd6 GP |
2418 | } |
2419 | ||
2420 | done: | |
2421 | if (pi->mode != rfc.mode) { | |
2422 | result = L2CAP_CONF_UNACCEPT; | |
2423 | rfc.mode = pi->mode; | |
2424 | ||
2425 | if (pi->num_conf_rsp == 1) | |
2426 | return -ECONNREFUSED; | |
2427 | ||
2428 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2429 | sizeof(rfc), (unsigned long) &rfc); | |
2430 | } | |
2431 | ||
2432 | ||
5dee9e7c MH |
2433 | if (result == L2CAP_CONF_SUCCESS) { |
2434 | /* Configure output options and let the other side know | |
2435 | * which ones we don't like. */ | |
2436 | ||
f2fcfcd6 GP |
2437 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
2438 | result = L2CAP_CONF_UNACCEPT; | |
2439 | else { | |
2440 | pi->omtu = mtu; | |
2441 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
2442 | } | |
2443 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 2444 | |
f2fcfcd6 GP |
2445 | switch (rfc.mode) { |
2446 | case L2CAP_MODE_BASIC: | |
2447 | pi->fcs = L2CAP_FCS_NONE; | |
2448 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
2449 | break; | |
2450 | ||
2451 | case L2CAP_MODE_ERTM: | |
2452 | pi->remote_tx_win = rfc.txwin_size; | |
2453 | pi->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
2454 | |
2455 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
2456 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
2457 | |
2458 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 2459 | |
10467e9e GP |
2460 | rfc.retrans_timeout = |
2461 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
2462 | rfc.monitor_timeout = | |
2463 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
2464 | |
2465 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2466 | |
2467 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2468 | sizeof(rfc), (unsigned long) &rfc); | |
2469 | ||
f2fcfcd6 GP |
2470 | break; |
2471 | ||
2472 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
2473 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
2474 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
2475 | |
2476 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
2477 | |
2478 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
2479 | |
2480 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2481 | sizeof(rfc), (unsigned long) &rfc); | |
2482 | ||
f2fcfcd6 GP |
2483 | break; |
2484 | ||
2485 | default: | |
5dee9e7c | 2486 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 2487 | |
6464f35f | 2488 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
2489 | rfc.mode = pi->mode; |
2490 | } | |
6464f35f | 2491 | |
f2fcfcd6 GP |
2492 | if (result == L2CAP_CONF_SUCCESS) |
2493 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
2494 | } | |
5dee9e7c MH |
2495 | rsp->scid = cpu_to_le16(pi->dcid); |
2496 | rsp->result = cpu_to_le16(result); | |
2497 | rsp->flags = cpu_to_le16(0x0000); | |
2498 | ||
2499 | return ptr - data; | |
1da177e4 LT |
2500 | } |
2501 | ||
f2fcfcd6 GP |
2502 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
2503 | { | |
2504 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2505 | struct l2cap_conf_req *req = data; | |
2506 | void *ptr = req->data; | |
2507 | int type, olen; | |
2508 | unsigned long val; | |
2509 | struct l2cap_conf_rfc rfc; | |
2510 | ||
2511 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
2512 | ||
2513 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2514 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2515 | ||
2516 | switch (type) { | |
2517 | case L2CAP_CONF_MTU: | |
2518 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
2519 | *result = L2CAP_CONF_UNACCEPT; | |
8183b775 | 2520 | pi->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 2521 | } else |
8183b775 AE |
2522 | pi->imtu = val; |
2523 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
f2fcfcd6 GP |
2524 | break; |
2525 | ||
2526 | case L2CAP_CONF_FLUSH_TO: | |
2527 | pi->flush_to = val; | |
2528 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
2529 | 2, pi->flush_to); | |
2530 | break; | |
2531 | ||
2532 | case L2CAP_CONF_RFC: | |
2533 | if (olen == sizeof(rfc)) | |
2534 | memcpy(&rfc, (void *)val, olen); | |
2535 | ||
2536 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
2537 | rfc.mode != pi->mode) | |
2538 | return -ECONNREFUSED; | |
2539 | ||
f2fcfcd6 GP |
2540 | pi->fcs = 0; |
2541 | ||
2542 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
2543 | sizeof(rfc), (unsigned long) &rfc); | |
2544 | break; | |
2545 | } | |
2546 | } | |
2547 | ||
6c2ea7a8 GP |
2548 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
2549 | return -ECONNREFUSED; | |
2550 | ||
2551 | pi->mode = rfc.mode; | |
2552 | ||
f2fcfcd6 GP |
2553 | if (*result == L2CAP_CONF_SUCCESS) { |
2554 | switch (rfc.mode) { | |
2555 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
2556 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2557 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 2558 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2559 | break; |
2560 | case L2CAP_MODE_STREAMING: | |
1c762159 | 2561 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
2562 | } |
2563 | } | |
2564 | ||
2565 | req->dcid = cpu_to_le16(pi->dcid); | |
2566 | req->flags = cpu_to_le16(0x0000); | |
2567 | ||
2568 | return ptr - data; | |
2569 | } | |
2570 | ||
5dee9e7c | 2571 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
2572 | { |
2573 | struct l2cap_conf_rsp *rsp = data; | |
2574 | void *ptr = rsp->data; | |
1da177e4 | 2575 | |
5dee9e7c | 2576 | BT_DBG("sk %p", sk); |
1da177e4 | 2577 | |
aca3192c | 2578 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 2579 | rsp->result = cpu_to_le16(result); |
aca3192c | 2580 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
2581 | |
2582 | return ptr - data; | |
2583 | } | |
2584 | ||
7b1c0049 GP |
2585 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
2586 | { | |
2587 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2588 | int type, olen; | |
2589 | unsigned long val; | |
2590 | struct l2cap_conf_rfc rfc; | |
2591 | ||
2592 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
2593 | ||
2594 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
2595 | return; | |
2596 | ||
2597 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
2598 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
2599 | ||
2600 | switch (type) { | |
2601 | case L2CAP_CONF_RFC: | |
2602 | if (olen == sizeof(rfc)) | |
2603 | memcpy(&rfc, (void *)val, olen); | |
2604 | goto done; | |
2605 | } | |
2606 | } | |
2607 | ||
2608 | done: | |
2609 | switch (rfc.mode) { | |
2610 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
2611 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
2612 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
2613 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
2614 | break; | |
2615 | case L2CAP_MODE_STREAMING: | |
2616 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
2617 | } | |
2618 | } | |
2619 | ||
4e8402a3 MH |
2620 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2621 | { | |
2622 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2623 | ||
2624 | if (rej->reason != 0x0000) | |
2625 | return 0; | |
2626 | ||
2627 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2628 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2629 | del_timer(&conn->info_timer); |
984947dc MH |
2630 | |
2631 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2632 | conn->info_ident = 0; |
984947dc | 2633 | |
4e8402a3 MH |
2634 | l2cap_conn_start(conn); |
2635 | } | |
2636 | ||
2637 | return 0; | |
2638 | } | |
2639 | ||
1da177e4 LT |
2640 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2641 | { | |
2642 | struct l2cap_chan_list *list = &conn->chan_list; | |
2643 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
2644 | struct l2cap_conn_rsp rsp; | |
d793fe8c | 2645 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2646 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2647 | |
2648 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2649 | __le16 psm = req->psm; |
1da177e4 LT |
2650 | |
2651 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2652 | ||
2653 | /* Check if we have socket listening on psm */ | |
2654 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2655 | if (!parent) { | |
2656 | result = L2CAP_CR_BAD_PSM; | |
2657 | goto sendresp; | |
2658 | } | |
2659 | ||
e0f0cb56 GP |
2660 | bh_lock_sock(parent); |
2661 | ||
e7c29cb1 MH |
2662 | /* Check if the ACL is secure enough (if not SDP) */ |
2663 | if (psm != cpu_to_le16(0x0001) && | |
2664 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2665 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2666 | result = L2CAP_CR_SEC_BLOCK; |
2667 | goto response; | |
2668 | } | |
2669 | ||
1da177e4 LT |
2670 | result = L2CAP_CR_NO_MEM; |
2671 | ||
2672 | /* Check for backlog size */ | |
2673 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2674 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2675 | goto response; |
2676 | } | |
2677 | ||
3b1e0a65 | 2678 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2679 | if (!sk) |
2680 | goto response; | |
2681 | ||
fd1278d7 | 2682 | write_lock_bh(&list->lock); |
1da177e4 LT |
2683 | |
2684 | /* Check if we already have channel with that dcid */ | |
2685 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2686 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2687 | sock_set_flag(sk, SOCK_ZAPPED); |
2688 | l2cap_sock_kill(sk); | |
2689 | goto response; | |
2690 | } | |
2691 | ||
2692 | hci_conn_hold(conn->hcon); | |
2693 | ||
2694 | l2cap_sock_init(sk, parent); | |
2695 | bacpy(&bt_sk(sk)->src, conn->src); | |
2696 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2697 | l2cap_pi(sk)->psm = psm; | |
2698 | l2cap_pi(sk)->dcid = scid; | |
2699 | ||
2700 | __l2cap_chan_add(conn, sk, parent); | |
2701 | dcid = l2cap_pi(sk)->scid; | |
2702 | ||
2703 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2704 | ||
1da177e4 LT |
2705 | l2cap_pi(sk)->ident = cmd->ident; |
2706 | ||
984947dc | 2707 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2708 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2709 | if (bt_sk(sk)->defer_setup) { |
2710 | sk->sk_state = BT_CONNECT2; | |
2711 | result = L2CAP_CR_PEND; | |
2712 | status = L2CAP_CS_AUTHOR_PEND; | |
2713 | parent->sk_data_ready(parent, 0); | |
2714 | } else { | |
2715 | sk->sk_state = BT_CONFIG; | |
2716 | result = L2CAP_CR_SUCCESS; | |
2717 | status = L2CAP_CS_NO_INFO; | |
2718 | } | |
79d554a6 MH |
2719 | } else { |
2720 | sk->sk_state = BT_CONNECT2; | |
2721 | result = L2CAP_CR_PEND; | |
2722 | status = L2CAP_CS_AUTHEN_PEND; | |
2723 | } | |
2724 | } else { | |
2725 | sk->sk_state = BT_CONNECT2; | |
2726 | result = L2CAP_CR_PEND; | |
2727 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2728 | } |
2729 | ||
fd1278d7 | 2730 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2731 | |
2732 | response: | |
2733 | bh_unlock_sock(parent); | |
2734 | ||
2735 | sendresp: | |
aca3192c YH |
2736 | rsp.scid = cpu_to_le16(scid); |
2737 | rsp.dcid = cpu_to_le16(dcid); | |
2738 | rsp.result = cpu_to_le16(result); | |
2739 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2740 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2741 | |
2742 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2743 | struct l2cap_info_req info; | |
2744 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2745 | ||
2746 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2747 | conn->info_ident = l2cap_get_ident(conn); | |
2748 | ||
2749 | mod_timer(&conn->info_timer, jiffies + | |
2750 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2751 | ||
2752 | l2cap_send_cmd(conn, conn->info_ident, | |
2753 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2754 | } | |
2755 | ||
d793fe8c | 2756 | if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2757 | result == L2CAP_CR_SUCCESS) { |
2758 | u8 buf[128]; | |
2759 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2760 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
2761 | l2cap_build_conf_req(sk, buf), buf); | |
2762 | l2cap_pi(sk)->num_conf_req++; | |
2763 | } | |
2764 | ||
1da177e4 LT |
2765 | return 0; |
2766 | } | |
2767 | ||
2768 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2769 | { | |
2770 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2771 | u16 scid, dcid, result, status; | |
2772 | struct sock *sk; | |
2773 | u8 req[128]; | |
2774 | ||
2775 | scid = __le16_to_cpu(rsp->scid); | |
2776 | dcid = __le16_to_cpu(rsp->dcid); | |
2777 | result = __le16_to_cpu(rsp->result); | |
2778 | status = __le16_to_cpu(rsp->status); | |
2779 | ||
2780 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2781 | ||
2782 | if (scid) { | |
af05b30b GP |
2783 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2784 | if (!sk) | |
57d3b22b | 2785 | return -EFAULT; |
1da177e4 | 2786 | } else { |
af05b30b GP |
2787 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2788 | if (!sk) | |
57d3b22b | 2789 | return -EFAULT; |
1da177e4 LT |
2790 | } |
2791 | ||
2792 | switch (result) { | |
2793 | case L2CAP_CR_SUCCESS: | |
2794 | sk->sk_state = BT_CONFIG; | |
2795 | l2cap_pi(sk)->ident = 0; | |
2796 | l2cap_pi(sk)->dcid = dcid; | |
6a8d3010 MH |
2797 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2798 | ||
e9aeb2dd GP |
2799 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) |
2800 | break; | |
2801 | ||
2802 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2803 | ||
1da177e4 LT |
2804 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2805 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 2806 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2807 | break; |
2808 | ||
2809 | case L2CAP_CR_PEND: | |
6a8d3010 | 2810 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2811 | break; |
2812 | ||
2813 | default: | |
a49184c2 AE |
2814 | /* don't delete l2cap channel if sk is owned by user */ |
2815 | if (sock_owned_by_user(sk)) { | |
2816 | sk->sk_state = BT_DISCONN; | |
2817 | l2cap_sock_clear_timer(sk); | |
2818 | l2cap_sock_set_timer(sk, HZ / 5); | |
2819 | break; | |
2820 | } | |
2821 | ||
1da177e4 LT |
2822 | l2cap_chan_del(sk, ECONNREFUSED); |
2823 | break; | |
2824 | } | |
2825 | ||
2826 | bh_unlock_sock(sk); | |
2827 | return 0; | |
2828 | } | |
2829 | ||
8c462b60 MM |
2830 | static inline void set_default_fcs(struct l2cap_pinfo *pi) |
2831 | { | |
2832 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2833 | * sides request it. | |
2834 | */ | |
2835 | if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) | |
2836 | pi->fcs = L2CAP_FCS_NONE; | |
2837 | else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) | |
2838 | pi->fcs = L2CAP_FCS_CRC16; | |
2839 | } | |
2840 | ||
88219a0f | 2841 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2842 | { |
2843 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2844 | u16 dcid, flags; | |
2845 | u8 rsp[64]; | |
2846 | struct sock *sk; | |
5dee9e7c | 2847 | int len; |
1da177e4 LT |
2848 | |
2849 | dcid = __le16_to_cpu(req->dcid); | |
2850 | flags = __le16_to_cpu(req->flags); | |
2851 | ||
2852 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2853 | ||
af05b30b GP |
2854 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2855 | if (!sk) | |
1da177e4 LT |
2856 | return -ENOENT; |
2857 | ||
df6bd743 GP |
2858 | if (sk->sk_state != BT_CONFIG) { |
2859 | struct l2cap_cmd_rej rej; | |
2860 | ||
2861 | rej.reason = cpu_to_le16(0x0002); | |
2862 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2863 | sizeof(rej), &rej); | |
354f60a9 | 2864 | goto unlock; |
df6bd743 | 2865 | } |
354f60a9 | 2866 | |
5dee9e7c | 2867 | /* Reject if config buffer is too small. */ |
88219a0f | 2868 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2869 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2870 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2871 | l2cap_build_conf_rsp(sk, rsp, | |
2872 | L2CAP_CONF_REJECT, flags), rsp); | |
2873 | goto unlock; | |
2874 | } | |
2875 | ||
2876 | /* Store config. */ | |
2877 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2878 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2879 | |
2880 | if (flags & 0x0001) { | |
2881 | /* Incomplete config. Send empty response. */ | |
2882 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2883 | l2cap_build_conf_rsp(sk, rsp, |
2884 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2885 | goto unlock; |
2886 | } | |
2887 | ||
2888 | /* Complete config. */ | |
5dee9e7c | 2889 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 2890 | if (len < 0) { |
9b108fc0 | 2891 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 | 2892 | goto unlock; |
f2fcfcd6 | 2893 | } |
1da177e4 | 2894 | |
5dee9e7c | 2895 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 2896 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 2897 | |
5dee9e7c MH |
2898 | /* Reset config buffer. */ |
2899 | l2cap_pi(sk)->conf_len = 0; | |
2900 | ||
876d9484 MH |
2901 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2902 | goto unlock; | |
2903 | ||
1da177e4 | 2904 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
8c462b60 | 2905 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2906 | |
1da177e4 | 2907 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2908 | |
0565c1c2 GP |
2909 | l2cap_pi(sk)->next_tx_seq = 0; |
2910 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 2911 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2912 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2913 | l2cap_ertm_init(sk); | |
2914 | ||
1da177e4 | 2915 | l2cap_chan_ready(sk); |
876d9484 MH |
2916 | goto unlock; |
2917 | } | |
2918 | ||
2919 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2920 | u8 buf[64]; |
ab3e5715 | 2921 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2922 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 2923 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 2924 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2925 | } |
2926 | ||
2927 | unlock: | |
2928 | bh_unlock_sock(sk); | |
2929 | return 0; | |
2930 | } | |
2931 | ||
2932 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2933 | { | |
2934 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2935 | u16 scid, flags, result; | |
2936 | struct sock *sk; | |
7b1c0049 | 2937 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2938 | |
2939 | scid = __le16_to_cpu(rsp->scid); | |
2940 | flags = __le16_to_cpu(rsp->flags); | |
2941 | result = __le16_to_cpu(rsp->result); | |
2942 | ||
af05b30b GP |
2943 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2944 | scid, flags, result); | |
1da177e4 | 2945 | |
af05b30b GP |
2946 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2947 | if (!sk) | |
1da177e4 LT |
2948 | return 0; |
2949 | ||
2950 | switch (result) { | |
2951 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2952 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2953 | break; |
2954 | ||
2955 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 2956 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2957 | char req[64]; |
2958 | ||
c2c77ec8 | 2959 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
9b108fc0 | 2960 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
c2c77ec8 AE |
2961 | goto done; |
2962 | } | |
2963 | ||
f2fcfcd6 GP |
2964 | /* throw out any old stored conf requests */ |
2965 | result = L2CAP_CONF_SUCCESS; | |
2966 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
2967 | len, req, &result); | |
2968 | if (len < 0) { | |
9b108fc0 | 2969 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
f2fcfcd6 GP |
2970 | goto done; |
2971 | } | |
2972 | ||
2973 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2974 | L2CAP_CONF_REQ, len, req); | |
2975 | l2cap_pi(sk)->num_conf_req++; | |
2976 | if (result != L2CAP_CONF_SUCCESS) | |
2977 | goto done; | |
2978 | break; | |
1da177e4 LT |
2979 | } |
2980 | ||
8e87d142 | 2981 | default: |
b1235d79 | 2982 | sk->sk_err = ECONNRESET; |
1da177e4 | 2983 | l2cap_sock_set_timer(sk, HZ * 5); |
9b108fc0 | 2984 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 LT |
2985 | goto done; |
2986 | } | |
2987 | ||
2988 | if (flags & 0x01) | |
2989 | goto done; | |
2990 | ||
1da177e4 LT |
2991 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2992 | ||
2993 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
8c462b60 | 2994 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2995 | |
1da177e4 | 2996 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 2997 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 2998 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 2999 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
3000 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
3001 | l2cap_ertm_init(sk); | |
3002 | ||
1da177e4 LT |
3003 | l2cap_chan_ready(sk); |
3004 | } | |
3005 | ||
3006 | done: | |
3007 | bh_unlock_sock(sk); | |
3008 | return 0; | |
3009 | } | |
3010 | ||
3011 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3012 | { | |
3013 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
3014 | struct l2cap_disconn_rsp rsp; | |
3015 | u16 dcid, scid; | |
3016 | struct sock *sk; | |
3017 | ||
3018 | scid = __le16_to_cpu(req->scid); | |
3019 | dcid = __le16_to_cpu(req->dcid); | |
3020 | ||
3021 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
3022 | ||
af05b30b GP |
3023 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
3024 | if (!sk) | |
1da177e4 LT |
3025 | return 0; |
3026 | ||
aca3192c YH |
3027 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
3028 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
3029 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
3030 | ||
3031 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3032 | ||
a49184c2 AE |
3033 | /* don't delete l2cap channel if sk is owned by user */ |
3034 | if (sock_owned_by_user(sk)) { | |
3035 | sk->sk_state = BT_DISCONN; | |
3036 | l2cap_sock_clear_timer(sk); | |
3037 | l2cap_sock_set_timer(sk, HZ / 5); | |
3038 | bh_unlock_sock(sk); | |
3039 | return 0; | |
3040 | } | |
3041 | ||
1da177e4 LT |
3042 | l2cap_chan_del(sk, ECONNRESET); |
3043 | bh_unlock_sock(sk); | |
3044 | ||
3045 | l2cap_sock_kill(sk); | |
3046 | return 0; | |
3047 | } | |
3048 | ||
3049 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3050 | { | |
3051 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
3052 | u16 dcid, scid; | |
3053 | struct sock *sk; | |
3054 | ||
3055 | scid = __le16_to_cpu(rsp->scid); | |
3056 | dcid = __le16_to_cpu(rsp->dcid); | |
3057 | ||
3058 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
3059 | ||
af05b30b GP |
3060 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
3061 | if (!sk) | |
1da177e4 LT |
3062 | return 0; |
3063 | ||
a49184c2 AE |
3064 | /* don't delete l2cap channel if sk is owned by user */ |
3065 | if (sock_owned_by_user(sk)) { | |
3066 | sk->sk_state = BT_DISCONN; | |
3067 | l2cap_sock_clear_timer(sk); | |
3068 | l2cap_sock_set_timer(sk, HZ / 5); | |
3069 | bh_unlock_sock(sk); | |
3070 | return 0; | |
3071 | } | |
3072 | ||
1da177e4 LT |
3073 | l2cap_chan_del(sk, 0); |
3074 | bh_unlock_sock(sk); | |
3075 | ||
3076 | l2cap_sock_kill(sk); | |
3077 | return 0; | |
3078 | } | |
3079 | ||
3080 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3081 | { | |
3082 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
3083 | u16 type; |
3084 | ||
3085 | type = __le16_to_cpu(req->type); | |
3086 | ||
3087 | BT_DBG("type 0x%4.4x", type); | |
3088 | ||
f0709e03 MH |
3089 | if (type == L2CAP_IT_FEAT_MASK) { |
3090 | u8 buf[8]; | |
44dd46de | 3091 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
3092 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
3093 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
3094 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 3095 | if (!disable_ertm) |
fcc203c3 GP |
3096 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
3097 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 3098 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
3099 | l2cap_send_cmd(conn, cmd->ident, |
3100 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
3101 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
3102 | u8 buf[12]; | |
3103 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
3104 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3105 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
3106 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
3107 | l2cap_send_cmd(conn, cmd->ident, | |
3108 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
3109 | } else { |
3110 | struct l2cap_info_rsp rsp; | |
3111 | rsp.type = cpu_to_le16(type); | |
3112 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
3113 | l2cap_send_cmd(conn, cmd->ident, | |
3114 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
3115 | } | |
1da177e4 LT |
3116 | |
3117 | return 0; | |
3118 | } | |
3119 | ||
3120 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
3121 | { | |
3122 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
3123 | u16 type, result; | |
3124 | ||
3125 | type = __le16_to_cpu(rsp->type); | |
3126 | result = __le16_to_cpu(rsp->result); | |
3127 | ||
3128 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
3129 | ||
4e8402a3 MH |
3130 | del_timer(&conn->info_timer); |
3131 | ||
adb08ede VT |
3132 | if (result != L2CAP_IR_SUCCESS) { |
3133 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3134 | conn->info_ident = 0; | |
3135 | ||
3136 | l2cap_conn_start(conn); | |
3137 | ||
3138 | return 0; | |
3139 | } | |
3140 | ||
984947dc | 3141 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 3142 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 3143 | |
47ec1dcd | 3144 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
3145 | struct l2cap_info_req req; |
3146 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
3147 | ||
3148 | conn->info_ident = l2cap_get_ident(conn); | |
3149 | ||
3150 | l2cap_send_cmd(conn, conn->info_ident, | |
3151 | L2CAP_INFO_REQ, sizeof(req), &req); | |
3152 | } else { | |
3153 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
3154 | conn->info_ident = 0; | |
3155 | ||
3156 | l2cap_conn_start(conn); | |
3157 | } | |
3158 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 3159 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 3160 | conn->info_ident = 0; |
984947dc MH |
3161 | |
3162 | l2cap_conn_start(conn); | |
3163 | } | |
4e8402a3 | 3164 | |
1da177e4 LT |
3165 | return 0; |
3166 | } | |
3167 | ||
3168 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) | |
3169 | { | |
3170 | u8 *data = skb->data; | |
3171 | int len = skb->len; | |
3172 | struct l2cap_cmd_hdr cmd; | |
3173 | int err = 0; | |
3174 | ||
3175 | l2cap_raw_recv(conn, skb); | |
3176 | ||
3177 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 3178 | u16 cmd_len; |
1da177e4 LT |
3179 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
3180 | data += L2CAP_CMD_HDR_SIZE; | |
3181 | len -= L2CAP_CMD_HDR_SIZE; | |
3182 | ||
88219a0f | 3183 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 3184 | |
88219a0f | 3185 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 3186 | |
88219a0f | 3187 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
3188 | BT_DBG("corrupted command"); |
3189 | break; | |
3190 | } | |
3191 | ||
3192 | switch (cmd.code) { | |
3193 | case L2CAP_COMMAND_REJ: | |
4e8402a3 | 3194 | l2cap_command_rej(conn, &cmd, data); |
1da177e4 LT |
3195 | break; |
3196 | ||
3197 | case L2CAP_CONN_REQ: | |
3198 | err = l2cap_connect_req(conn, &cmd, data); | |
3199 | break; | |
3200 | ||
3201 | case L2CAP_CONN_RSP: | |
3202 | err = l2cap_connect_rsp(conn, &cmd, data); | |
3203 | break; | |
3204 | ||
3205 | case L2CAP_CONF_REQ: | |
88219a0f | 3206 | err = l2cap_config_req(conn, &cmd, cmd_len, data); |
1da177e4 LT |
3207 | break; |
3208 | ||
3209 | case L2CAP_CONF_RSP: | |
3210 | err = l2cap_config_rsp(conn, &cmd, data); | |
3211 | break; | |
3212 | ||
3213 | case L2CAP_DISCONN_REQ: | |
3214 | err = l2cap_disconnect_req(conn, &cmd, data); | |
3215 | break; | |
3216 | ||
3217 | case L2CAP_DISCONN_RSP: | |
3218 | err = l2cap_disconnect_rsp(conn, &cmd, data); | |
3219 | break; | |
3220 | ||
3221 | case L2CAP_ECHO_REQ: | |
88219a0f | 3222 | l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); |
1da177e4 LT |
3223 | break; |
3224 | ||
3225 | case L2CAP_ECHO_RSP: | |
3226 | break; | |
3227 | ||
3228 | case L2CAP_INFO_REQ: | |
3229 | err = l2cap_information_req(conn, &cmd, data); | |
3230 | break; | |
3231 | ||
3232 | case L2CAP_INFO_RSP: | |
3233 | err = l2cap_information_rsp(conn, &cmd, data); | |
3234 | break; | |
3235 | ||
3236 | default: | |
3237 | BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); | |
3238 | err = -EINVAL; | |
3239 | break; | |
3240 | } | |
3241 | ||
3242 | if (err) { | |
3243 | struct l2cap_cmd_rej rej; | |
3244 | BT_DBG("error %d", err); | |
3245 | ||
3246 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 3247 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
3248 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
3249 | } | |
3250 | ||
88219a0f AV |
3251 | data += cmd_len; |
3252 | len -= cmd_len; | |
1da177e4 LT |
3253 | } |
3254 | ||
3255 | kfree_skb(skb); | |
3256 | } | |
3257 | ||
fcc203c3 GP |
3258 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
3259 | { | |
3260 | u16 our_fcs, rcv_fcs; | |
3261 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
3262 | ||
3263 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
3264 | skb_trim(skb, skb->len - 2); | |
3265 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
3266 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
3267 | ||
3268 | if (our_fcs != rcv_fcs) | |
7a560e5c | 3269 | return -EBADMSG; |
fcc203c3 GP |
3270 | } |
3271 | return 0; | |
3272 | } | |
3273 | ||
d5392c8f GP |
3274 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
3275 | { | |
3276 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3277 | u16 control = 0; | |
3278 | ||
3279 | pi->frames_sent = 0; | |
d5392c8f GP |
3280 | |
3281 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3282 | ||
3283 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
64988868 | 3284 | control |= L2CAP_SUPER_RCV_NOT_READY; |
d5392c8f | 3285 | l2cap_send_sframe(pi, control); |
1890d36b | 3286 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
3287 | } |
3288 | ||
4ea727ef GP |
3289 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) |
3290 | l2cap_retransmit_frames(sk); | |
d5392c8f GP |
3291 | |
3292 | l2cap_ertm_send(sk); | |
3293 | ||
3294 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
3295 | pi->frames_sent == 0) { | |
3296 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
3297 | l2cap_send_sframe(pi, control); |
3298 | } | |
3299 | } | |
3300 | ||
9b53350d | 3301 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
3302 | { |
3303 | struct sk_buff *next_skb; | |
bfbacc11 JPRV |
3304 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3305 | int tx_seq_offset, next_tx_seq_offset; | |
8f17154f GP |
3306 | |
3307 | bt_cb(skb)->tx_seq = tx_seq; | |
3308 | bt_cb(skb)->sar = sar; | |
3309 | ||
3310 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
3311 | if (!next_skb) { | |
3312 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 3313 | return 0; |
8f17154f GP |
3314 | } |
3315 | ||
bfbacc11 JPRV |
3316 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3317 | if (tx_seq_offset < 0) | |
3318 | tx_seq_offset += 64; | |
3319 | ||
8f17154f | 3320 | do { |
9b53350d JPRV |
3321 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
3322 | return -EINVAL; | |
3323 | ||
bfbacc11 JPRV |
3324 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
3325 | pi->buffer_seq) % 64; | |
3326 | if (next_tx_seq_offset < 0) | |
3327 | next_tx_seq_offset += 64; | |
3328 | ||
3329 | if (next_tx_seq_offset > tx_seq_offset) { | |
8f17154f | 3330 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
9b53350d | 3331 | return 0; |
8f17154f GP |
3332 | } |
3333 | ||
3334 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
3335 | break; | |
3336 | ||
59203a21 | 3337 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
3338 | |
3339 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
3340 | |
3341 | return 0; | |
8f17154f GP |
3342 | } |
3343 | ||
18778a63 GP |
3344 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
3345 | { | |
3346 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3347 | struct sk_buff *_skb; | |
1890d36b | 3348 | int err; |
18778a63 GP |
3349 | |
3350 | switch (control & L2CAP_CTRL_SAR) { | |
3351 | case L2CAP_SDU_UNSEGMENTED: | |
3352 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3353 | goto drop; | |
3354 | ||
3355 | err = sock_queue_rcv_skb(sk, skb); | |
3356 | if (!err) | |
3357 | return err; | |
3358 | ||
3359 | break; | |
3360 | ||
3361 | case L2CAP_SDU_START: | |
3362 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
3363 | goto drop; | |
3364 | ||
3365 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
3366 | |
3367 | if (pi->sdu_len > pi->imtu) | |
3368 | goto disconnect; | |
3369 | ||
3370 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
3371 | if (!pi->sdu) |
3372 | return -ENOMEM; | |
3373 | ||
3374 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
3375 | * condition we have to be sure that this will be executed | |
3376 | * only once, i.e., when alloc does not fail */ | |
3377 | skb_pull(skb, 2); | |
18778a63 GP |
3378 | |
3379 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3380 | ||
3381 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3382 | pi->partial_sdu_len = skb->len; | |
3383 | break; | |
3384 | ||
3385 | case L2CAP_SDU_CONTINUE: | |
3386 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3387 | goto disconnect; | |
3388 | ||
3389 | if (!pi->sdu) | |
3390 | goto disconnect; | |
3391 | ||
18778a63 GP |
3392 | pi->partial_sdu_len += skb->len; |
3393 | if (pi->partial_sdu_len > pi->sdu_len) | |
3394 | goto drop; | |
3395 | ||
4178ba46 GP |
3396 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
3397 | ||
18778a63 GP |
3398 | break; |
3399 | ||
3400 | case L2CAP_SDU_END: | |
3401 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3402 | goto disconnect; | |
3403 | ||
3404 | if (!pi->sdu) | |
3405 | goto disconnect; | |
3406 | ||
1890d36b | 3407 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 3408 | pi->partial_sdu_len += skb->len; |
18778a63 | 3409 | |
1890d36b GP |
3410 | if (pi->partial_sdu_len > pi->imtu) |
3411 | goto drop; | |
18778a63 | 3412 | |
1890d36b GP |
3413 | if (pi->partial_sdu_len != pi->sdu_len) |
3414 | goto drop; | |
4178ba46 GP |
3415 | |
3416 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 3417 | } |
18778a63 GP |
3418 | |
3419 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
3420 | if (!_skb) { |
3421 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
3422 | return -ENOMEM; | |
3423 | } | |
3424 | ||
18778a63 | 3425 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 3426 | if (err < 0) { |
18778a63 | 3427 | kfree_skb(_skb); |
1890d36b GP |
3428 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
3429 | return err; | |
3430 | } | |
3431 | ||
3432 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
3433 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
3434 | |
3435 | kfree_skb(pi->sdu); | |
3436 | break; | |
3437 | } | |
3438 | ||
3439 | kfree_skb(skb); | |
1890d36b | 3440 | return 0; |
18778a63 GP |
3441 | |
3442 | drop: | |
3443 | kfree_skb(pi->sdu); | |
3444 | pi->sdu = NULL; | |
3445 | ||
3446 | disconnect: | |
9b108fc0 | 3447 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
18778a63 GP |
3448 | kfree_skb(skb); |
3449 | return 0; | |
3450 | } | |
3451 | ||
712132eb GP |
3452 | static int l2cap_try_push_rx_skb(struct sock *sk) |
3453 | { | |
3454 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3455 | struct sk_buff *skb; | |
3456 | u16 control; | |
3457 | int err; | |
3458 | ||
3459 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
3460 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
3461 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3462 | if (err < 0) { | |
3463 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
3464 | return -EBUSY; | |
3465 | } | |
3466 | ||
3467 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3468 | } | |
3469 | ||
3470 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
3471 | goto done; | |
3472 | ||
3473 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3474 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
3475 | l2cap_send_sframe(pi, control); | |
3476 | l2cap_pi(sk)->retry_count = 1; | |
3477 | ||
3478 | del_timer(&pi->retrans_timer); | |
3479 | __mod_monitor_timer(); | |
3480 | ||
3481 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
3482 | ||
3483 | done: | |
3484 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
3485 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
3486 | ||
3487 | BT_DBG("sk %p, Exit local busy", sk); | |
3488 | ||
3489 | return 0; | |
3490 | } | |
3491 | ||
1890d36b GP |
3492 | static void l2cap_busy_work(struct work_struct *work) |
3493 | { | |
3494 | DECLARE_WAITQUEUE(wait, current); | |
3495 | struct l2cap_pinfo *pi = | |
3496 | container_of(work, struct l2cap_pinfo, busy_work); | |
3497 | struct sock *sk = (struct sock *)pi; | |
3498 | int n_tries = 0, timeo = HZ/5, err; | |
3499 | struct sk_buff *skb; | |
1890d36b GP |
3500 | |
3501 | lock_sock(sk); | |
3502 | ||
2b0b05dd | 3503 | add_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3504 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { |
3505 | set_current_state(TASK_INTERRUPTIBLE); | |
3506 | ||
3507 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3508 | err = -EBUSY; | |
9b108fc0 | 3509 | l2cap_send_disconn_req(pi->conn, sk, EBUSY); |
712132eb | 3510 | break; |
1890d36b GP |
3511 | } |
3512 | ||
3513 | if (!timeo) | |
3514 | timeo = HZ/5; | |
3515 | ||
3516 | if (signal_pending(current)) { | |
3517 | err = sock_intr_errno(timeo); | |
712132eb | 3518 | break; |
1890d36b GP |
3519 | } |
3520 | ||
3521 | release_sock(sk); | |
3522 | timeo = schedule_timeout(timeo); | |
3523 | lock_sock(sk); | |
3524 | ||
3525 | err = sock_error(sk); | |
3526 | if (err) | |
712132eb | 3527 | break; |
1890d36b | 3528 | |
712132eb | 3529 | if (l2cap_try_push_rx_skb(sk) == 0) |
1890d36b GP |
3530 | break; |
3531 | } | |
3532 | ||
1890d36b | 3533 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3534 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3535 | |
3536 | release_sock(sk); | |
3537 | } | |
3538 | ||
3539 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
3540 | { | |
3541 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3542 | int sctrl, err; | |
3543 | ||
3544 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
3545 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3546 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
712132eb GP |
3547 | return l2cap_try_push_rx_skb(sk); |
3548 | ||
3549 | ||
1890d36b GP |
3550 | } |
3551 | ||
3552 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
3553 | if (err >= 0) { | |
3554 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
3555 | return err; | |
3556 | } | |
3557 | ||
3558 | /* Busy Condition */ | |
0e98958d GP |
3559 | BT_DBG("sk %p, Enter local busy", sk); |
3560 | ||
1890d36b GP |
3561 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
3562 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
3563 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
3564 | ||
3565 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3566 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
3567 | l2cap_send_sframe(pi, sctrl); | |
3568 | ||
3569 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
3570 | ||
7fe9b298 GP |
3571 | del_timer(&pi->ack_timer); |
3572 | ||
1890d36b GP |
3573 | queue_work(_busy_wq, &pi->busy_work); |
3574 | ||
3575 | return err; | |
3576 | } | |
3577 | ||
18778a63 | 3578 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3579 | { |
3580 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3581 | struct sk_buff *_skb; | |
3582 | int err = -EINVAL; | |
3583 | ||
18778a63 GP |
3584 | /* |
3585 | * TODO: We have to notify the userland if some data is lost with the | |
3586 | * Streaming Mode. | |
3587 | */ | |
3588 | ||
c74e560c GP |
3589 | switch (control & L2CAP_CTRL_SAR) { |
3590 | case L2CAP_SDU_UNSEGMENTED: | |
3591 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3592 | kfree_skb(pi->sdu); | |
3593 | break; | |
3594 | } | |
3595 | ||
3596 | err = sock_queue_rcv_skb(sk, skb); | |
3597 | if (!err) | |
3598 | return 0; | |
3599 | ||
3600 | break; | |
3601 | ||
3602 | case L2CAP_SDU_START: | |
3603 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3604 | kfree_skb(pi->sdu); | |
3605 | break; | |
3606 | } | |
3607 | ||
3608 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3609 | skb_pull(skb, 2); | |
3610 | ||
052897ca GP |
3611 | if (pi->sdu_len > pi->imtu) { |
3612 | err = -EMSGSIZE; | |
3613 | break; | |
3614 | } | |
3615 | ||
c74e560c GP |
3616 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3617 | if (!pi->sdu) { | |
3618 | err = -ENOMEM; | |
3619 | break; | |
3620 | } | |
3621 | ||
3622 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3623 | ||
3624 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3625 | pi->partial_sdu_len = skb->len; | |
3626 | err = 0; | |
3627 | break; | |
3628 | ||
3629 | case L2CAP_SDU_CONTINUE: | |
3630 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3631 | break; | |
3632 | ||
3633 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3634 | ||
3635 | pi->partial_sdu_len += skb->len; | |
3636 | if (pi->partial_sdu_len > pi->sdu_len) | |
3637 | kfree_skb(pi->sdu); | |
3638 | else | |
3639 | err = 0; | |
3640 | ||
3641 | break; | |
3642 | ||
3643 | case L2CAP_SDU_END: | |
3644 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3645 | break; | |
3646 | ||
3647 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3648 | ||
3649 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3650 | pi->partial_sdu_len += skb->len; | |
3651 | ||
36f2fd58 GP |
3652 | if (pi->partial_sdu_len > pi->imtu) |
3653 | goto drop; | |
3654 | ||
c74e560c GP |
3655 | if (pi->partial_sdu_len == pi->sdu_len) { |
3656 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3657 | err = sock_queue_rcv_skb(sk, _skb); | |
3658 | if (err < 0) | |
3659 | kfree_skb(_skb); | |
3660 | } | |
c74e560c GP |
3661 | err = 0; |
3662 | ||
36f2fd58 GP |
3663 | drop: |
3664 | kfree_skb(pi->sdu); | |
c74e560c GP |
3665 | break; |
3666 | } | |
3667 | ||
3668 | kfree_skb(skb); | |
3669 | return err; | |
3670 | } | |
3671 | ||
8f17154f GP |
3672 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3673 | { | |
3674 | struct sk_buff *skb; | |
afefdbc4 | 3675 | u16 control; |
8f17154f | 3676 | |
59203a21 | 3677 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3678 | if (bt_cb(skb)->tx_seq != tx_seq) |
3679 | break; | |
3680 | ||
3681 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3682 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3683 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3684 | l2cap_pi(sk)->buffer_seq_srej = |
3685 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3686 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3687 | } |
3688 | } | |
3689 | ||
3690 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3691 | { | |
3692 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3693 | struct srej_list *l, *tmp; | |
3694 | u16 control; | |
3695 | ||
59203a21 | 3696 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3697 | if (l->tx_seq == tx_seq) { |
3698 | list_del(&l->list); | |
3699 | kfree(l); | |
3700 | return; | |
3701 | } | |
3702 | control = L2CAP_SUPER_SELECT_REJECT; | |
3703 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3704 | l2cap_send_sframe(pi, control); | |
3705 | list_del(&l->list); | |
3706 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3707 | } | |
3708 | } | |
3709 | ||
3710 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3711 | { | |
3712 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3713 | struct srej_list *new; | |
3714 | u16 control; | |
3715 | ||
3716 | while (tx_seq != pi->expected_tx_seq) { | |
3717 | control = L2CAP_SUPER_SELECT_REJECT; | |
3718 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3719 | l2cap_send_sframe(pi, control); | |
3720 | ||
3721 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
8ff50ec0 GP |
3722 | new->tx_seq = pi->expected_tx_seq; |
3723 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
8f17154f GP |
3724 | list_add_tail(&new->list, SREJ_LIST(sk)); |
3725 | } | |
8ff50ec0 | 3726 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
8f17154f GP |
3727 | } |
3728 | ||
1c2acffb GP |
3729 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3730 | { | |
3731 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3732 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3733 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3734 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3735 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3736 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3737 | int err = 0; |
3738 | ||
0e98958d GP |
3739 | BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, |
3740 | rx_control); | |
1c2acffb | 3741 | |
9b16dc65 GP |
3742 | if (L2CAP_CTRL_FINAL & rx_control && |
3743 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3744 | del_timer(&pi->monitor_timer); |
3745 | if (pi->unacked_frames > 0) | |
3746 | __mod_retrans_timer(); | |
3747 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3748 | } | |
3749 | ||
9f121a5a GP |
3750 | pi->expected_ack_seq = req_seq; |
3751 | l2cap_drop_acked_frames(sk); | |
3752 | ||
8f17154f GP |
3753 | if (tx_seq == pi->expected_tx_seq) |
3754 | goto expected; | |
1c2acffb | 3755 | |
9b53350d JPRV |
3756 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3757 | if (tx_seq_offset < 0) | |
3758 | tx_seq_offset += 64; | |
3759 | ||
3760 | /* invalid tx_seq */ | |
3761 | if (tx_seq_offset >= pi->tx_win) { | |
9b108fc0 | 3762 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
9b53350d JPRV |
3763 | goto drop; |
3764 | } | |
3765 | ||
1890d36b GP |
3766 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
3767 | goto drop; | |
3768 | ||
8f17154f GP |
3769 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3770 | struct srej_list *first; | |
30afb5b2 | 3771 | |
8f17154f GP |
3772 | first = list_first_entry(SREJ_LIST(sk), |
3773 | struct srej_list, list); | |
3774 | if (tx_seq == first->tx_seq) { | |
3775 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3776 | l2cap_check_srej_gap(sk, tx_seq); | |
3777 | ||
3778 | list_del(&first->list); | |
3779 | kfree(first); | |
3780 | ||
3781 | if (list_empty(SREJ_LIST(sk))) { | |
3782 | pi->buffer_seq = pi->buffer_seq_srej; | |
3783 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3784 | l2cap_send_ack(pi); |
0e98958d | 3785 | BT_DBG("sk %p, Exit SREJ_SENT", sk); |
8f17154f GP |
3786 | } |
3787 | } else { | |
3788 | struct srej_list *l; | |
9b53350d JPRV |
3789 | |
3790 | /* duplicated tx_seq */ | |
3791 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
3792 | goto drop; | |
8f17154f GP |
3793 | |
3794 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3795 | if (l->tx_seq == tx_seq) { | |
3796 | l2cap_resend_srejframe(sk, tx_seq); | |
3797 | return 0; | |
3798 | } | |
3799 | } | |
3800 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3801 | } |
3802 | } else { | |
9b53350d JPRV |
3803 | expected_tx_seq_offset = |
3804 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
3805 | if (expected_tx_seq_offset < 0) | |
3806 | expected_tx_seq_offset += 64; | |
3807 | ||
3808 | /* duplicated tx_seq */ | |
3809 | if (tx_seq_offset < expected_tx_seq_offset) | |
3810 | goto drop; | |
3811 | ||
8f17154f | 3812 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3813 | |
0e98958d GP |
3814 | BT_DBG("sk %p, Enter SREJ", sk); |
3815 | ||
8f17154f GP |
3816 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3817 | pi->buffer_seq_srej = pi->buffer_seq; | |
3818 | ||
3819 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 3820 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
3821 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3822 | ||
ef54fd93 GP |
3823 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3824 | ||
8f17154f | 3825 | l2cap_send_srejframe(sk, tx_seq); |
7fe9b298 GP |
3826 | |
3827 | del_timer(&pi->ack_timer); | |
1c2acffb | 3828 | } |
30afb5b2 GP |
3829 | return 0; |
3830 | ||
8f17154f GP |
3831 | expected: |
3832 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3833 | ||
3834 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3835 | bt_cb(skb)->tx_seq = tx_seq; |
3836 | bt_cb(skb)->sar = sar; | |
3837 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3838 | return 0; |
3839 | } | |
3840 | ||
2ece3684 GP |
3841 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
3842 | if (err < 0) | |
3843 | return 0; | |
3844 | ||
4ec10d97 GP |
3845 | if (rx_control & L2CAP_CTRL_FINAL) { |
3846 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3847 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3848 | else |
3849 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
3850 | } |
3851 | ||
c1b4f43b GP |
3852 | __mod_ack_timer(); |
3853 | ||
803020c6 GP |
3854 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3855 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3856 | l2cap_send_ack(pi); |
3857 | ||
8f17154f | 3858 | return 0; |
9b53350d JPRV |
3859 | |
3860 | drop: | |
3861 | kfree_skb(skb); | |
3862 | return 0; | |
1c2acffb GP |
3863 | } |
3864 | ||
e072745f | 3865 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
3866 | { |
3867 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 | 3868 | |
0e98958d GP |
3869 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), |
3870 | rx_control); | |
3871 | ||
6e3a5981 GP |
3872 | pi->expected_ack_seq = __get_reqseq(rx_control); |
3873 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 3874 | |
e072745f | 3875 | if (rx_control & L2CAP_CTRL_POLL) { |
3cb123d1 | 3876 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; |
05fbd89d GP |
3877 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3878 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
3879 | (pi->unacked_frames > 0)) | |
3880 | __mod_retrans_timer(); | |
3881 | ||
3882 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3883 | l2cap_send_srejtail(sk); | |
3884 | } else { | |
3885 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 3886 | } |
1d8f5d16 | 3887 | |
e072745f GP |
3888 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3889 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 3890 | |
e072745f GP |
3891 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3892 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3893 | else |
3894 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 3895 | |
e072745f | 3896 | } else { |
e072745f GP |
3897 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3898 | (pi->unacked_frames > 0)) | |
3899 | __mod_retrans_timer(); | |
1c2acffb | 3900 | |
2246b2f1 | 3901 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
894718a6 | 3902 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) |
e072745f | 3903 | l2cap_send_ack(pi); |
894718a6 | 3904 | else |
e072745f GP |
3905 | l2cap_ertm_send(sk); |
3906 | } | |
3907 | } | |
2246b2f1 | 3908 | |
e072745f GP |
3909 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
3910 | { | |
3911 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3912 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3913 | |
0e98958d GP |
3914 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3915 | ||
e072745f GP |
3916 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3917 | ||
8abb52ee | 3918 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
3919 | l2cap_drop_acked_frames(sk); |
3920 | ||
3921 | if (rx_control & L2CAP_CTRL_FINAL) { | |
3922 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3923 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3924 | else |
3925 | l2cap_retransmit_frames(sk); | |
e072745f | 3926 | } else { |
dfc909be | 3927 | l2cap_retransmit_frames(sk); |
30afb5b2 | 3928 | |
0301ef04 | 3929 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 3930 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
3931 | } |
3932 | } | |
3933 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
3934 | { | |
3935 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3936 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3937 | |
0e98958d GP |
3938 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3939 | ||
e072745f | 3940 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3941 | |
e072745f GP |
3942 | if (rx_control & L2CAP_CTRL_POLL) { |
3943 | pi->expected_ack_seq = tx_seq; | |
3944 | l2cap_drop_acked_frames(sk); | |
3cb123d1 GP |
3945 | |
3946 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
dfc909be GP |
3947 | l2cap_retransmit_one_frame(sk, tx_seq); |
3948 | ||
e072745f | 3949 | l2cap_ertm_send(sk); |
dfc909be | 3950 | |
e072745f GP |
3951 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3952 | pi->srej_save_reqseq = tx_seq; | |
3953 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3954 | } |
e072745f GP |
3955 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3956 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
3957 | pi->srej_save_reqseq == tx_seq) | |
3958 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
3959 | else | |
dfc909be | 3960 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 3961 | } else { |
dfc909be | 3962 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
3963 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3964 | pi->srej_save_reqseq = tx_seq; | |
3965 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3966 | } |
e072745f GP |
3967 | } |
3968 | } | |
3969 | ||
3970 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
3971 | { | |
3972 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3973 | u8 tx_seq = __get_reqseq(rx_control); | |
3974 | ||
0e98958d GP |
3975 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3976 | ||
e072745f GP |
3977 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
3978 | pi->expected_ack_seq = tx_seq; | |
3979 | l2cap_drop_acked_frames(sk); | |
3980 | ||
3cb123d1 GP |
3981 | if (rx_control & L2CAP_CTRL_POLL) |
3982 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
3983 | ||
99b0d4b7 GP |
3984 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
3985 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
3986 | if (rx_control & L2CAP_CTRL_POLL) |
3987 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 3988 | return; |
e072745f | 3989 | } |
99b0d4b7 GP |
3990 | |
3991 | if (rx_control & L2CAP_CTRL_POLL) | |
3992 | l2cap_send_srejtail(sk); | |
3993 | else | |
3994 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
3995 | } |
3996 | ||
3997 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
3998 | { | |
3999 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
4000 | ||
9b16dc65 GP |
4001 | if (L2CAP_CTRL_FINAL & rx_control && |
4002 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
4003 | del_timer(&l2cap_pi(sk)->monitor_timer); |
4004 | if (l2cap_pi(sk)->unacked_frames > 0) | |
4005 | __mod_retrans_timer(); | |
4006 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
4007 | } | |
4008 | ||
4009 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
4010 | case L2CAP_SUPER_RCV_READY: | |
4011 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
4012 | break; |
4013 | ||
e072745f GP |
4014 | case L2CAP_SUPER_REJECT: |
4015 | l2cap_data_channel_rejframe(sk, rx_control); | |
4016 | break; | |
2246b2f1 | 4017 | |
e072745f GP |
4018 | case L2CAP_SUPER_SELECT_REJECT: |
4019 | l2cap_data_channel_srejframe(sk, rx_control); | |
4020 | break; | |
4021 | ||
4022 | case L2CAP_SUPER_RCV_NOT_READY: | |
4023 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
4024 | break; |
4025 | } | |
4026 | ||
faaebd19 | 4027 | kfree_skb(skb); |
1c2acffb GP |
4028 | return 0; |
4029 | } | |
4030 | ||
218bb9df GP |
4031 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
4032 | { | |
4033 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
4034 | u16 control; | |
4035 | u8 req_seq; | |
4036 | int len, next_tx_seq_offset, req_seq_offset; | |
4037 | ||
4038 | control = get_unaligned_le16(skb->data); | |
4039 | skb_pull(skb, 2); | |
4040 | len = skb->len; | |
4041 | ||
4042 | /* | |
4043 | * We can just drop the corrupted I-frame here. | |
4044 | * Receiver will miss it and start proper recovery | |
4045 | * procedures and ask retransmission. | |
4046 | */ | |
4047 | if (l2cap_check_fcs(pi, skb)) | |
4048 | goto drop; | |
4049 | ||
4050 | if (__is_sar_start(control) && __is_iframe(control)) | |
4051 | len -= 2; | |
4052 | ||
4053 | if (pi->fcs == L2CAP_FCS_CRC16) | |
4054 | len -= 2; | |
4055 | ||
4056 | if (len > pi->mps) { | |
4057 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4058 | goto drop; | |
4059 | } | |
4060 | ||
4061 | req_seq = __get_reqseq(control); | |
4062 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
4063 | if (req_seq_offset < 0) | |
4064 | req_seq_offset += 64; | |
4065 | ||
4066 | next_tx_seq_offset = | |
4067 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
4068 | if (next_tx_seq_offset < 0) | |
4069 | next_tx_seq_offset += 64; | |
4070 | ||
4071 | /* check for invalid req-seq */ | |
4072 | if (req_seq_offset > next_tx_seq_offset) { | |
4073 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4074 | goto drop; | |
4075 | } | |
4076 | ||
4077 | if (__is_iframe(control)) { | |
4078 | if (len < 0) { | |
4079 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4080 | goto drop; | |
4081 | } | |
4082 | ||
4083 | l2cap_data_channel_iframe(sk, control, skb); | |
4084 | } else { | |
4085 | if (len != 0) { | |
4086 | BT_ERR("%d", len); | |
4087 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
4088 | goto drop; | |
4089 | } | |
4090 | ||
4091 | l2cap_data_channel_sframe(sk, control, skb); | |
4092 | } | |
4093 | ||
4094 | return 0; | |
4095 | ||
4096 | drop: | |
4097 | kfree_skb(skb); | |
4098 | return 0; | |
4099 | } | |
4100 | ||
1da177e4 LT |
4101 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
4102 | { | |
4103 | struct sock *sk; | |
6840ed07 | 4104 | struct l2cap_pinfo *pi; |
51893f88 | 4105 | u16 control; |
218bb9df GP |
4106 | u8 tx_seq; |
4107 | int len; | |
1da177e4 LT |
4108 | |
4109 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
4110 | if (!sk) { | |
4111 | BT_DBG("unknown cid 0x%4.4x", cid); | |
4112 | goto drop; | |
4113 | } | |
4114 | ||
6840ed07 GP |
4115 | pi = l2cap_pi(sk); |
4116 | ||
1da177e4 LT |
4117 | BT_DBG("sk %p, len %d", sk, skb->len); |
4118 | ||
4119 | if (sk->sk_state != BT_CONNECTED) | |
4120 | goto drop; | |
4121 | ||
6840ed07 | 4122 | switch (pi->mode) { |
1c2acffb GP |
4123 | case L2CAP_MODE_BASIC: |
4124 | /* If socket recv buffers overflows we drop data here | |
4125 | * which is *bad* because L2CAP has to be reliable. | |
4126 | * But we don't have any other choice. L2CAP doesn't | |
4127 | * provide flow control mechanism. */ | |
1da177e4 | 4128 | |
6840ed07 | 4129 | if (pi->imtu < skb->len) |
1c2acffb | 4130 | goto drop; |
1da177e4 | 4131 | |
1c2acffb GP |
4132 | if (!sock_queue_rcv_skb(sk, skb)) |
4133 | goto done; | |
4134 | break; | |
4135 | ||
4136 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
4137 | if (!sock_owned_by_user(sk)) { |
4138 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 4139 | } else { |
218bb9df | 4140 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 4141 | goto drop; |
277ffbe3 | 4142 | } |
1c2acffb | 4143 | |
fcafde2e | 4144 | goto done; |
1c2acffb | 4145 | |
6840ed07 GP |
4146 | case L2CAP_MODE_STREAMING: |
4147 | control = get_unaligned_le16(skb->data); | |
4148 | skb_pull(skb, 2); | |
4149 | len = skb->len; | |
4150 | ||
26000089 GP |
4151 | if (l2cap_check_fcs(pi, skb)) |
4152 | goto drop; | |
4153 | ||
6840ed07 GP |
4154 | if (__is_sar_start(control)) |
4155 | len -= 2; | |
4156 | ||
fcc203c3 GP |
4157 | if (pi->fcs == L2CAP_FCS_CRC16) |
4158 | len -= 2; | |
4159 | ||
51893f88 | 4160 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
4161 | goto drop; |
4162 | ||
4163 | tx_seq = __get_txseq(control); | |
4164 | ||
4165 | if (pi->expected_tx_seq == tx_seq) | |
4166 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
4167 | else | |
7dffe421 | 4168 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 4169 | |
18778a63 | 4170 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
4171 | |
4172 | goto done; | |
4173 | ||
1c2acffb | 4174 | default: |
e8235c6b | 4175 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
4176 | break; |
4177 | } | |
1da177e4 LT |
4178 | |
4179 | drop: | |
4180 | kfree_skb(skb); | |
4181 | ||
4182 | done: | |
0139418c MH |
4183 | if (sk) |
4184 | bh_unlock_sock(sk); | |
4185 | ||
1da177e4 LT |
4186 | return 0; |
4187 | } | |
4188 | ||
8e036fc3 | 4189 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
4190 | { |
4191 | struct sock *sk; | |
4192 | ||
4193 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
4194 | if (!sk) | |
4195 | goto drop; | |
4196 | ||
e0f0cb56 GP |
4197 | bh_lock_sock(sk); |
4198 | ||
1da177e4 LT |
4199 | BT_DBG("sk %p, len %d", sk, skb->len); |
4200 | ||
4201 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
4202 | goto drop; | |
4203 | ||
4204 | if (l2cap_pi(sk)->imtu < skb->len) | |
4205 | goto drop; | |
4206 | ||
4207 | if (!sock_queue_rcv_skb(sk, skb)) | |
4208 | goto done; | |
4209 | ||
4210 | drop: | |
4211 | kfree_skb(skb); | |
4212 | ||
4213 | done: | |
af05b30b GP |
4214 | if (sk) |
4215 | bh_unlock_sock(sk); | |
1da177e4 LT |
4216 | return 0; |
4217 | } | |
4218 | ||
4219 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
4220 | { | |
4221 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
4222 | u16 cid, len; |
4223 | __le16 psm; | |
1da177e4 LT |
4224 | |
4225 | skb_pull(skb, L2CAP_HDR_SIZE); | |
4226 | cid = __le16_to_cpu(lh->cid); | |
4227 | len = __le16_to_cpu(lh->len); | |
4228 | ||
1c2acffb GP |
4229 | if (len != skb->len) { |
4230 | kfree_skb(skb); | |
4231 | return; | |
4232 | } | |
4233 | ||
1da177e4 LT |
4234 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
4235 | ||
4236 | switch (cid) { | |
8db4dc46 | 4237 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
4238 | l2cap_sig_channel(conn, skb); |
4239 | break; | |
4240 | ||
8db4dc46 | 4241 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 4242 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
4243 | skb_pull(skb, 2); |
4244 | l2cap_conless_channel(conn, psm, skb); | |
4245 | break; | |
4246 | ||
4247 | default: | |
4248 | l2cap_data_channel(conn, cid, skb); | |
4249 | break; | |
4250 | } | |
4251 | } | |
4252 | ||
4253 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
4254 | ||
4255 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
4256 | { | |
4257 | int exact = 0, lm1 = 0, lm2 = 0; | |
4258 | register struct sock *sk; | |
4259 | struct hlist_node *node; | |
4260 | ||
4261 | if (type != ACL_LINK) | |
963cf687 | 4262 | return -EINVAL; |
1da177e4 LT |
4263 | |
4264 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
4265 | ||
4266 | /* Find listening sockets and check their link_mode */ | |
4267 | read_lock(&l2cap_sk_list.lock); | |
4268 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
4269 | if (sk->sk_state != BT_LISTEN) | |
4270 | continue; | |
4271 | ||
4272 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
4273 | lm1 |= HCI_LM_ACCEPT; |
4274 | if (l2cap_pi(sk)->role_switch) | |
4275 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 4276 | exact++; |
2af6b9d5 MH |
4277 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
4278 | lm2 |= HCI_LM_ACCEPT; | |
4279 | if (l2cap_pi(sk)->role_switch) | |
4280 | lm2 |= HCI_LM_MASTER; | |
4281 | } | |
1da177e4 LT |
4282 | } |
4283 | read_unlock(&l2cap_sk_list.lock); | |
4284 | ||
4285 | return exact ? lm1 : lm2; | |
4286 | } | |
4287 | ||
4288 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
4289 | { | |
0139418c MH |
4290 | struct l2cap_conn *conn; |
4291 | ||
1da177e4 LT |
4292 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
4293 | ||
4294 | if (hcon->type != ACL_LINK) | |
963cf687 | 4295 | return -EINVAL; |
1da177e4 LT |
4296 | |
4297 | if (!status) { | |
1da177e4 LT |
4298 | conn = l2cap_conn_add(hcon, status); |
4299 | if (conn) | |
4300 | l2cap_conn_ready(conn); | |
0139418c | 4301 | } else |
1da177e4 LT |
4302 | l2cap_conn_del(hcon, bt_err(status)); |
4303 | ||
4304 | return 0; | |
4305 | } | |
4306 | ||
2950f21a MH |
4307 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
4308 | { | |
4309 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4310 | ||
4311 | BT_DBG("hcon %p", hcon); | |
4312 | ||
4313 | if (hcon->type != ACL_LINK || !conn) | |
4314 | return 0x13; | |
4315 | ||
4316 | return conn->disc_reason; | |
4317 | } | |
4318 | ||
4319 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
4320 | { |
4321 | BT_DBG("hcon %p reason %d", hcon, reason); | |
4322 | ||
4323 | if (hcon->type != ACL_LINK) | |
963cf687 | 4324 | return -EINVAL; |
1da177e4 LT |
4325 | |
4326 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 4327 | |
1da177e4 LT |
4328 | return 0; |
4329 | } | |
4330 | ||
f62e4323 MH |
4331 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
4332 | { | |
bd3c9e25 | 4333 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
4334 | return; |
4335 | ||
f62e4323 MH |
4336 | if (encrypt == 0x00) { |
4337 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
4338 | l2cap_sock_clear_timer(sk); | |
4339 | l2cap_sock_set_timer(sk, HZ * 5); | |
4340 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
4341 | __l2cap_sock_close(sk, ECONNREFUSED); | |
4342 | } else { | |
4343 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
4344 | l2cap_sock_clear_timer(sk); | |
4345 | } | |
4346 | } | |
4347 | ||
8c1b2355 | 4348 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
4349 | { |
4350 | struct l2cap_chan_list *l; | |
0139418c | 4351 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 4352 | struct sock *sk; |
1da177e4 | 4353 | |
0139418c | 4354 | if (!conn) |
1da177e4 | 4355 | return 0; |
0139418c | 4356 | |
1da177e4 LT |
4357 | l = &conn->chan_list; |
4358 | ||
4359 | BT_DBG("conn %p", conn); | |
4360 | ||
4361 | read_lock(&l->lock); | |
4362 | ||
4363 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
4364 | bh_lock_sock(sk); | |
4365 | ||
6a8d3010 MH |
4366 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
4367 | bh_unlock_sock(sk); | |
4368 | continue; | |
4369 | } | |
4370 | ||
f62e4323 | 4371 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 4372 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 4373 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
4374 | bh_unlock_sock(sk); |
4375 | continue; | |
4376 | } | |
4377 | ||
b1235d79 MH |
4378 | if (sk->sk_state == BT_CONNECT) { |
4379 | if (!status) { | |
4380 | struct l2cap_conn_req req; | |
4381 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4382 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 4383 | |
b1235d79 | 4384 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 4385 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 4386 | |
b1235d79 MH |
4387 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4388 | L2CAP_CONN_REQ, sizeof(req), &req); | |
4389 | } else { | |
4390 | l2cap_sock_clear_timer(sk); | |
4391 | l2cap_sock_set_timer(sk, HZ / 10); | |
4392 | } | |
4393 | } else if (sk->sk_state == BT_CONNECT2) { | |
4394 | struct l2cap_conn_rsp rsp; | |
4395 | __u16 result; | |
1da177e4 | 4396 | |
b1235d79 MH |
4397 | if (!status) { |
4398 | sk->sk_state = BT_CONFIG; | |
4399 | result = L2CAP_CR_SUCCESS; | |
4400 | } else { | |
4401 | sk->sk_state = BT_DISCONN; | |
4402 | l2cap_sock_set_timer(sk, HZ / 10); | |
4403 | result = L2CAP_CR_SEC_BLOCK; | |
4404 | } | |
4405 | ||
4406 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
4407 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
4408 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 4409 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
4410 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
4411 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
4412 | } | |
1da177e4 LT |
4413 | |
4414 | bh_unlock_sock(sk); | |
4415 | } | |
4416 | ||
4417 | read_unlock(&l->lock); | |
b1235d79 | 4418 | |
1da177e4 LT |
4419 | return 0; |
4420 | } | |
4421 | ||
4422 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
4423 | { | |
4424 | struct l2cap_conn *conn = hcon->l2cap_data; | |
4425 | ||
5a08ecce AE |
4426 | if (!conn) |
4427 | conn = l2cap_conn_add(hcon, 0); | |
4428 | ||
4429 | if (!conn) | |
1da177e4 LT |
4430 | goto drop; |
4431 | ||
4432 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
4433 | ||
e702112f | 4434 | if (!(flags & ACL_CONT)) { |
1da177e4 | 4435 | struct l2cap_hdr *hdr; |
89794813 AE |
4436 | struct sock *sk; |
4437 | u16 cid; | |
1da177e4 LT |
4438 | int len; |
4439 | ||
4440 | if (conn->rx_len) { | |
4441 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
4442 | kfree_skb(conn->rx_skb); | |
4443 | conn->rx_skb = NULL; | |
4444 | conn->rx_len = 0; | |
4445 | l2cap_conn_unreliable(conn, ECOMM); | |
4446 | } | |
4447 | ||
aae7fe22 AE |
4448 | /* Start fragment always begin with Basic L2CAP header */ |
4449 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
4450 | BT_ERR("Frame is too short (len %d)", skb->len); |
4451 | l2cap_conn_unreliable(conn, ECOMM); | |
4452 | goto drop; | |
4453 | } | |
4454 | ||
4455 | hdr = (struct l2cap_hdr *) skb->data; | |
4456 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 4457 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4458 | |
4459 | if (len == skb->len) { | |
4460 | /* Complete frame received */ | |
4461 | l2cap_recv_frame(conn, skb); | |
4462 | return 0; | |
4463 | } | |
4464 | ||
4465 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4466 | ||
4467 | if (skb->len > len) { | |
4468 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4469 | skb->len, len); | |
4470 | l2cap_conn_unreliable(conn, ECOMM); | |
4471 | goto drop; | |
4472 | } | |
4473 | ||
89794813 AE |
4474 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); |
4475 | ||
4476 | if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { | |
4477 | BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)", | |
4478 | len, l2cap_pi(sk)->imtu); | |
4479 | bh_unlock_sock(sk); | |
4480 | l2cap_conn_unreliable(conn, ECOMM); | |
4481 | goto drop; | |
4482 | } | |
4483 | ||
4484 | if (sk) | |
4485 | bh_unlock_sock(sk); | |
4486 | ||
1da177e4 | 4487 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4488 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4489 | if (!conn->rx_skb) | |
1da177e4 LT |
4490 | goto drop; |
4491 | ||
d626f62b | 4492 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4493 | skb->len); |
1da177e4 LT |
4494 | conn->rx_len = len - skb->len; |
4495 | } else { | |
4496 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4497 | ||
4498 | if (!conn->rx_len) { | |
4499 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4500 | l2cap_conn_unreliable(conn, ECOMM); | |
4501 | goto drop; | |
4502 | } | |
4503 | ||
4504 | if (skb->len > conn->rx_len) { | |
4505 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4506 | skb->len, conn->rx_len); | |
4507 | kfree_skb(conn->rx_skb); | |
4508 | conn->rx_skb = NULL; | |
4509 | conn->rx_len = 0; | |
4510 | l2cap_conn_unreliable(conn, ECOMM); | |
4511 | goto drop; | |
4512 | } | |
4513 | ||
d626f62b | 4514 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4515 | skb->len); |
1da177e4 LT |
4516 | conn->rx_len -= skb->len; |
4517 | ||
4518 | if (!conn->rx_len) { | |
4519 | /* Complete frame received */ | |
4520 | l2cap_recv_frame(conn, conn->rx_skb); | |
4521 | conn->rx_skb = NULL; | |
4522 | } | |
4523 | } | |
4524 | ||
4525 | drop: | |
4526 | kfree_skb(skb); | |
4527 | return 0; | |
4528 | } | |
4529 | ||
aef7d97c | 4530 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4531 | { |
4532 | struct sock *sk; | |
4533 | struct hlist_node *node; | |
1da177e4 LT |
4534 | |
4535 | read_lock_bh(&l2cap_sk_list.lock); | |
4536 | ||
be9d1227 MH |
4537 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4538 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 4539 | |
aef7d97c MH |
4540 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", |
4541 | batostr(&bt_sk(sk)->src), | |
4542 | batostr(&bt_sk(sk)->dst), | |
4543 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4544 | pi->scid, pi->dcid, | |
4545 | pi->imtu, pi->omtu, pi->sec_level); | |
be9d1227 | 4546 | } |
1da177e4 | 4547 | |
1da177e4 | 4548 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4549 | |
aef7d97c | 4550 | return 0; |
1da177e4 LT |
4551 | } |
4552 | ||
aef7d97c MH |
4553 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4554 | { | |
4555 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4556 | } | |
4557 | ||
4558 | static const struct file_operations l2cap_debugfs_fops = { | |
4559 | .open = l2cap_debugfs_open, | |
4560 | .read = seq_read, | |
4561 | .llseek = seq_lseek, | |
4562 | .release = single_release, | |
4563 | }; | |
4564 | ||
4565 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4566 | |
1da177e4 LT |
4567 | static struct hci_proto l2cap_hci_proto = { |
4568 | .name = "L2CAP", | |
4569 | .id = HCI_PROTO_L2CAP, | |
4570 | .connect_ind = l2cap_connect_ind, | |
4571 | .connect_cfm = l2cap_connect_cfm, | |
4572 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4573 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4574 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4575 | .recv_acldata = l2cap_recv_acldata |
4576 | }; | |
4577 | ||
4578 | static int __init l2cap_init(void) | |
4579 | { | |
4580 | int err; | |
be9d1227 | 4581 | |
bb58f747 | 4582 | err = l2cap_init_sockets(); |
1da177e4 LT |
4583 | if (err < 0) |
4584 | return err; | |
4585 | ||
1890d36b | 4586 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4587 | if (!_busy_wq) { |
bb58f747 | 4588 | err = -ENOMEM; |
1da177e4 LT |
4589 | goto error; |
4590 | } | |
4591 | ||
4592 | err = hci_register_proto(&l2cap_hci_proto); | |
4593 | if (err < 0) { | |
4594 | BT_ERR("L2CAP protocol registration failed"); | |
4595 | bt_sock_unregister(BTPROTO_L2CAP); | |
4596 | goto error; | |
4597 | } | |
4598 | ||
aef7d97c MH |
4599 | if (bt_debugfs) { |
4600 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4601 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4602 | if (!l2cap_debugfs) | |
4603 | BT_ERR("Failed to create L2CAP debug file"); | |
4604 | } | |
1da177e4 LT |
4605 | |
4606 | BT_INFO("L2CAP ver %s", VERSION); | |
4607 | BT_INFO("L2CAP socket layer initialized"); | |
4608 | ||
4609 | return 0; | |
4610 | ||
4611 | error: | |
b78d7b4f | 4612 | destroy_workqueue(_busy_wq); |
bb58f747 | 4613 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4614 | return err; |
4615 | } | |
4616 | ||
4617 | static void __exit l2cap_exit(void) | |
4618 | { | |
aef7d97c | 4619 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4620 | |
1890d36b GP |
4621 | flush_workqueue(_busy_wq); |
4622 | destroy_workqueue(_busy_wq); | |
4623 | ||
1da177e4 LT |
4624 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4625 | BT_ERR("L2CAP protocol unregistration failed"); | |
4626 | ||
bb58f747 | 4627 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4628 | } |
4629 | ||
4630 | void l2cap_load(void) | |
4631 | { | |
4632 | /* Dummy function to trigger automatic L2CAP module loading by | |
4633 | * other modules that use L2CAP sockets but don't use any other | |
4634 | * symbols from it. */ | |
1da177e4 LT |
4635 | } |
4636 | EXPORT_SYMBOL(l2cap_load); | |
4637 | ||
4638 | module_init(l2cap_init); | |
4639 | module_exit(l2cap_exit); | |
4640 | ||
d1c4a17d GP |
4641 | module_param(disable_ertm, bool, 0644); |
4642 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); | |
44dd46de | 4643 | |
63fbd24e | 4644 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
4645 | MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); |
4646 | MODULE_VERSION(VERSION); | |
4647 | MODULE_LICENSE("GPL"); | |
4648 | MODULE_ALIAS("bt-proto-0"); |