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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 | ||
bb58f747 | 58 | int disable_ertm; |
f0709e03 | 59 | |
47ec1dcd | 60 | static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; |
e1027a7c | 61 | static u8 l2cap_fixed_chan[8] = { 0x02, }; |
1da177e4 | 62 | |
1890d36b GP |
63 | static struct workqueue_struct *_busy_wq; |
64 | ||
bb58f747 | 65 | struct bt_sock_list l2cap_sk_list = { |
d5fb2962 | 66 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
1da177e4 LT |
67 | }; |
68 | ||
1890d36b GP |
69 | static void l2cap_busy_work(struct work_struct *work); |
70 | ||
1da177e4 LT |
71 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, |
72 | u8 code, u8 ident, u16 dlen, void *data); | |
73 | ||
218bb9df GP |
74 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
75 | ||
0139418c MH |
76 | /* ---- L2CAP channels ---- */ |
77 | static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) | |
78 | { | |
79 | struct sock *s; | |
80 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
81 | if (l2cap_pi(s)->dcid == cid) | |
82 | break; | |
83 | } | |
84 | return s; | |
85 | } | |
86 | ||
87 | static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
88 | { | |
89 | struct sock *s; | |
90 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
91 | if (l2cap_pi(s)->scid == cid) | |
92 | break; | |
93 | } | |
94 | return s; | |
95 | } | |
96 | ||
97 | /* Find channel with given SCID. | |
98 | * Returns locked socket */ | |
99 | static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) | |
100 | { | |
101 | struct sock *s; | |
102 | read_lock(&l->lock); | |
103 | s = __l2cap_get_chan_by_scid(l, cid); | |
af05b30b GP |
104 | if (s) |
105 | bh_lock_sock(s); | |
0139418c MH |
106 | read_unlock(&l->lock); |
107 | return s; | |
108 | } | |
109 | ||
110 | static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
111 | { | |
112 | struct sock *s; | |
113 | for (s = l->head; s; s = l2cap_pi(s)->next_c) { | |
114 | if (l2cap_pi(s)->ident == ident) | |
115 | break; | |
116 | } | |
117 | return s; | |
118 | } | |
119 | ||
120 | static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) | |
121 | { | |
122 | struct sock *s; | |
123 | read_lock(&l->lock); | |
124 | s = __l2cap_get_chan_by_ident(l, ident); | |
af05b30b GP |
125 | if (s) |
126 | bh_lock_sock(s); | |
0139418c MH |
127 | read_unlock(&l->lock); |
128 | return s; | |
129 | } | |
130 | ||
131 | static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) | |
132 | { | |
8db4dc46 | 133 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 134 | |
8db4dc46 | 135 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
af05b30b | 136 | if (!__l2cap_get_chan_by_scid(l, cid)) |
0139418c MH |
137 | return cid; |
138 | } | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) | |
144 | { | |
145 | sock_hold(sk); | |
146 | ||
147 | if (l->head) | |
148 | l2cap_pi(l->head)->prev_c = sk; | |
149 | ||
150 | l2cap_pi(sk)->next_c = l->head; | |
151 | l2cap_pi(sk)->prev_c = NULL; | |
152 | l->head = sk; | |
153 | } | |
154 | ||
155 | static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) | |
156 | { | |
157 | struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; | |
158 | ||
fd1278d7 | 159 | write_lock_bh(&l->lock); |
0139418c MH |
160 | if (sk == l->head) |
161 | l->head = next; | |
162 | ||
163 | if (next) | |
164 | l2cap_pi(next)->prev_c = prev; | |
165 | if (prev) | |
166 | l2cap_pi(prev)->next_c = next; | |
fd1278d7 | 167 | write_unlock_bh(&l->lock); |
0139418c MH |
168 | |
169 | __sock_put(sk); | |
170 | } | |
171 | ||
172 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
173 | { | |
174 | struct l2cap_chan_list *l = &conn->chan_list; | |
175 | ||
af05b30b GP |
176 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
177 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 178 | |
2950f21a MH |
179 | conn->disc_reason = 0x13; |
180 | ||
0139418c MH |
181 | l2cap_pi(sk)->conn = conn; |
182 | ||
bd3c9e25 | 183 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
b62f328b VT |
184 | if (conn->hcon->type == LE_LINK) { |
185 | /* LE connection */ | |
186 | l2cap_pi(sk)->omtu = L2CAP_LE_DEFAULT_MTU; | |
187 | l2cap_pi(sk)->scid = L2CAP_CID_LE_DATA; | |
188 | l2cap_pi(sk)->dcid = L2CAP_CID_LE_DATA; | |
189 | } else { | |
190 | /* Alloc CID for connection-oriented socket */ | |
191 | l2cap_pi(sk)->scid = l2cap_alloc_cid(l); | |
192 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; | |
193 | } | |
0139418c MH |
194 | } else if (sk->sk_type == SOCK_DGRAM) { |
195 | /* Connectionless socket */ | |
8db4dc46 GP |
196 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
197 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0139418c MH |
198 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
199 | } else { | |
200 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
201 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
202 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0139418c MH |
203 | l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; |
204 | } | |
205 | ||
206 | __l2cap_chan_link(l, sk); | |
207 | ||
208 | if (parent) | |
209 | bt_accept_enqueue(parent, sk); | |
210 | } | |
211 | ||
8e87d142 | 212 | /* Delete channel. |
0139418c | 213 | * Must be called on the locked socket. */ |
6de0702b | 214 | void l2cap_chan_del(struct sock *sk, int err) |
0139418c MH |
215 | { |
216 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
217 | struct sock *parent = bt_sk(sk)->parent; | |
218 | ||
219 | l2cap_sock_clear_timer(sk); | |
220 | ||
221 | BT_DBG("sk %p, conn %p, err %d", sk, conn, err); | |
222 | ||
8e87d142 | 223 | if (conn) { |
0139418c MH |
224 | /* Unlink from channel list */ |
225 | l2cap_chan_unlink(&conn->chan_list, sk); | |
226 | l2cap_pi(sk)->conn = NULL; | |
227 | hci_conn_put(conn->hcon); | |
228 | } | |
229 | ||
b1235d79 | 230 | sk->sk_state = BT_CLOSED; |
0139418c MH |
231 | sock_set_flag(sk, SOCK_ZAPPED); |
232 | ||
233 | if (err) | |
234 | sk->sk_err = err; | |
235 | ||
236 | if (parent) { | |
237 | bt_accept_unlink(sk); | |
238 | parent->sk_data_ready(parent, 0); | |
239 | } else | |
240 | sk->sk_state_change(sk); | |
c13ffa62 GP |
241 | |
242 | skb_queue_purge(TX_QUEUE(sk)); | |
243 | ||
244 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
245 | struct srej_list *l, *tmp; | |
246 | ||
247 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
248 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
249 | del_timer(&l2cap_pi(sk)->ack_timer); | |
250 | ||
251 | skb_queue_purge(SREJ_QUEUE(sk)); | |
252 | skb_queue_purge(BUSY_QUEUE(sk)); | |
253 | ||
254 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { | |
255 | list_del(&l->list); | |
256 | kfree(l); | |
257 | } | |
258 | } | |
0139418c MH |
259 | } |
260 | ||
8556edd3 | 261 | static inline u8 l2cap_get_auth_type(struct sock *sk) |
79d554a6 | 262 | { |
8556edd3 JH |
263 | if (sk->sk_type == SOCK_RAW) { |
264 | switch (l2cap_pi(sk)->sec_level) { | |
265 | case BT_SECURITY_HIGH: | |
266 | return HCI_AT_DEDICATED_BONDING_MITM; | |
267 | case BT_SECURITY_MEDIUM: | |
268 | return HCI_AT_DEDICATED_BONDING; | |
269 | default: | |
270 | return HCI_AT_NO_BONDING; | |
271 | } | |
272 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { | |
273 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) | |
274 | l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 275 | |
00ae4af9 | 276 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 277 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 278 | else |
8556edd3 | 279 | return HCI_AT_NO_BONDING; |
00ae4af9 MH |
280 | } else { |
281 | switch (l2cap_pi(sk)->sec_level) { | |
282 | case BT_SECURITY_HIGH: | |
8556edd3 | 283 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 284 | case BT_SECURITY_MEDIUM: |
8556edd3 | 285 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 286 | default: |
8556edd3 | 287 | return HCI_AT_NO_BONDING; |
00ae4af9 | 288 | } |
0684e5f9 | 289 | } |
8556edd3 JH |
290 | } |
291 | ||
292 | /* Service level security */ | |
293 | static inline int l2cap_check_security(struct sock *sk) | |
294 | { | |
295 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
296 | __u8 auth_type; | |
297 | ||
298 | auth_type = l2cap_get_auth_type(sk); | |
79d554a6 | 299 | |
0684e5f9 MH |
300 | return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, |
301 | auth_type); | |
79d554a6 MH |
302 | } |
303 | ||
68983259 | 304 | u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
305 | { |
306 | u8 id; | |
307 | ||
308 | /* Get next available identificator. | |
309 | * 1 - 128 are used by kernel. | |
310 | * 129 - 199 are reserved. | |
311 | * 200 - 254 are used by utilities like l2ping, etc. | |
312 | */ | |
313 | ||
314 | spin_lock_bh(&conn->lock); | |
315 | ||
316 | if (++conn->tx_ident > 128) | |
317 | conn->tx_ident = 1; | |
318 | ||
319 | id = conn->tx_ident; | |
320 | ||
321 | spin_unlock_bh(&conn->lock); | |
322 | ||
323 | return id; | |
324 | } | |
325 | ||
68983259 | 326 | void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
327 | { |
328 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 329 | u8 flags; |
4e8402a3 MH |
330 | |
331 | BT_DBG("code 0x%2.2x", code); | |
332 | ||
333 | if (!skb) | |
9a9c6a34 | 334 | return; |
4e8402a3 | 335 | |
e702112f AE |
336 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
337 | flags = ACL_START_NO_FLUSH; | |
338 | else | |
339 | flags = ACL_START; | |
340 | ||
341 | hci_send_acl(conn->hcon, skb, flags); | |
4e8402a3 MH |
342 | } |
343 | ||
9a9c6a34 | 344 | static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) |
1c2acffb GP |
345 | { |
346 | struct sk_buff *skb; | |
347 | struct l2cap_hdr *lh; | |
348 | struct l2cap_conn *conn = pi->conn; | |
c13ffa62 | 349 | struct sock *sk = (struct sock *)pi; |
fcc203c3 | 350 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 351 | u8 flags; |
fcc203c3 | 352 | |
c13ffa62 GP |
353 | if (sk->sk_state != BT_CONNECTED) |
354 | return; | |
355 | ||
fcc203c3 GP |
356 | if (pi->fcs == L2CAP_FCS_CRC16) |
357 | hlen += 2; | |
1c2acffb GP |
358 | |
359 | BT_DBG("pi %p, control 0x%2.2x", pi, control); | |
360 | ||
fcc203c3 | 361 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
362 | control |= L2CAP_CTRL_FRAME_TYPE; |
363 | ||
9e917af1 GP |
364 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
365 | control |= L2CAP_CTRL_FINAL; | |
366 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
367 | } | |
368 | ||
f0946ccf GP |
369 | if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { |
370 | control |= L2CAP_CTRL_POLL; | |
371 | pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; | |
372 | } | |
373 | ||
1c2acffb GP |
374 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
375 | if (!skb) | |
9a9c6a34 | 376 | return; |
1c2acffb GP |
377 | |
378 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 379 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
380 | lh->cid = cpu_to_le16(pi->dcid); |
381 | put_unaligned_le16(control, skb_put(skb, 2)); | |
382 | ||
fcc203c3 GP |
383 | if (pi->fcs == L2CAP_FCS_CRC16) { |
384 | u16 fcs = crc16(0, (u8 *)lh, count - 2); | |
385 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
386 | } | |
387 | ||
e702112f AE |
388 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
389 | flags = ACL_START_NO_FLUSH; | |
390 | else | |
391 | flags = ACL_START; | |
392 | ||
393 | hci_send_acl(pi->conn->hcon, skb, flags); | |
1c2acffb GP |
394 | } |
395 | ||
9a9c6a34 | 396 | static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) |
7e743090 | 397 | { |
1890d36b | 398 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 399 | control |= L2CAP_SUPER_RCV_NOT_READY; |
1890d36b GP |
400 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
401 | } else | |
7e743090 GP |
402 | control |= L2CAP_SUPER_RCV_READY; |
403 | ||
2ab25cdd GP |
404 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
405 | ||
9a9c6a34 | 406 | l2cap_send_sframe(pi, control); |
7e743090 GP |
407 | } |
408 | ||
e501d055 AE |
409 | static inline int __l2cap_no_conn_pending(struct sock *sk) |
410 | { | |
411 | return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); | |
412 | } | |
413 | ||
79d554a6 MH |
414 | static void l2cap_do_start(struct sock *sk) |
415 | { | |
416 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
417 | ||
418 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
419 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
420 | return; | |
421 | ||
e501d055 | 422 | if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { |
b1235d79 MH |
423 | struct l2cap_conn_req req; |
424 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
425 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 426 | |
b1235d79 | 427 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 428 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 429 | |
b1235d79 | 430 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
79d554a6 | 431 | L2CAP_CONN_REQ, sizeof(req), &req); |
b1235d79 | 432 | } |
79d554a6 MH |
433 | } else { |
434 | struct l2cap_info_req req; | |
435 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
436 | ||
437 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
438 | conn->info_ident = l2cap_get_ident(conn); | |
439 | ||
440 | mod_timer(&conn->info_timer, jiffies + | |
441 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
442 | ||
443 | l2cap_send_cmd(conn, conn->info_ident, | |
444 | L2CAP_INFO_REQ, sizeof(req), &req); | |
445 | } | |
446 | } | |
447 | ||
cf6c2c0b GP |
448 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
449 | { | |
450 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 451 | if (!disable_ertm) |
cf6c2c0b GP |
452 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
453 | ||
454 | switch (mode) { | |
455 | case L2CAP_MODE_ERTM: | |
456 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
457 | case L2CAP_MODE_STREAMING: | |
458 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
459 | default: | |
460 | return 0x00; | |
461 | } | |
462 | } | |
463 | ||
6de0702b | 464 | void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) |
22121fc9 GP |
465 | { |
466 | struct l2cap_disconn_req req; | |
467 | ||
c13ffa62 GP |
468 | if (!conn) |
469 | return; | |
470 | ||
471 | skb_queue_purge(TX_QUEUE(sk)); | |
472 | ||
473 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { | |
474 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
475 | del_timer(&l2cap_pi(sk)->monitor_timer); | |
476 | del_timer(&l2cap_pi(sk)->ack_timer); | |
477 | } | |
478 | ||
22121fc9 GP |
479 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
480 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
481 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
482 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
483 | |
484 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 485 | sk->sk_err = err; |
22121fc9 GP |
486 | } |
487 | ||
1da177e4 | 488 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
489 | static void l2cap_conn_start(struct l2cap_conn *conn) |
490 | { | |
491 | struct l2cap_chan_list *l = &conn->chan_list; | |
cf6c2c0b | 492 | struct sock_del_list del, *tmp1, *tmp2; |
4e8402a3 MH |
493 | struct sock *sk; |
494 | ||
495 | BT_DBG("conn %p", conn); | |
496 | ||
cf6c2c0b GP |
497 | INIT_LIST_HEAD(&del.list); |
498 | ||
4e8402a3 MH |
499 | read_lock(&l->lock); |
500 | ||
501 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
502 | bh_lock_sock(sk); | |
503 | ||
bd3c9e25 GP |
504 | if (sk->sk_type != SOCK_SEQPACKET && |
505 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
506 | bh_unlock_sock(sk); |
507 | continue; | |
508 | } | |
509 | ||
510 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 511 | struct l2cap_conn_req req; |
79d554a6 | 512 | |
47731de7 GP |
513 | if (!l2cap_check_security(sk) || |
514 | !__l2cap_no_conn_pending(sk)) { | |
515 | bh_unlock_sock(sk); | |
516 | continue; | |
517 | } | |
79d554a6 | 518 | |
47731de7 GP |
519 | if (!l2cap_mode_supported(l2cap_pi(sk)->mode, |
520 | conn->feat_mask) | |
521 | && l2cap_pi(sk)->conf_state & | |
522 | L2CAP_CONF_STATE2_DEVICE) { | |
523 | tmp1 = kzalloc(sizeof(struct sock_del_list), | |
524 | GFP_ATOMIC); | |
525 | tmp1->sk = sk; | |
526 | list_add_tail(&tmp1->list, &del.list); | |
527 | bh_unlock_sock(sk); | |
528 | continue; | |
b1235d79 | 529 | } |
47731de7 GP |
530 | |
531 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
532 | req.psm = l2cap_pi(sk)->psm; | |
533 | ||
534 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); | |
535 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; | |
536 | ||
537 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
538 | L2CAP_CONN_REQ, sizeof(req), &req); | |
539 | ||
79d554a6 MH |
540 | } else if (sk->sk_state == BT_CONNECT2) { |
541 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 542 | char buf[128]; |
79d554a6 MH |
543 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
544 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
545 | ||
2af6b9d5 | 546 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
547 | if (bt_sk(sk)->defer_setup) { |
548 | struct sock *parent = bt_sk(sk)->parent; | |
549 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
550 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
551 | parent->sk_data_ready(parent, 0); | |
552 | ||
553 | } else { | |
554 | sk->sk_state = BT_CONFIG; | |
555 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
556 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
557 | } | |
79d554a6 MH |
558 | } else { |
559 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
560 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
561 | } | |
562 | ||
563 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, | |
564 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
e9aeb2dd GP |
565 | |
566 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || | |
567 | rsp.result != L2CAP_CR_SUCCESS) { | |
568 | bh_unlock_sock(sk); | |
569 | continue; | |
570 | } | |
571 | ||
572 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
573 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
574 | l2cap_build_conf_req(sk, buf), buf); | |
575 | l2cap_pi(sk)->num_conf_req++; | |
4e8402a3 MH |
576 | } |
577 | ||
578 | bh_unlock_sock(sk); | |
579 | } | |
580 | ||
581 | read_unlock(&l->lock); | |
cf6c2c0b GP |
582 | |
583 | list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { | |
584 | bh_lock_sock(tmp1->sk); | |
585 | __l2cap_sock_close(tmp1->sk, ECONNRESET); | |
586 | bh_unlock_sock(tmp1->sk); | |
587 | list_del(&tmp1->list); | |
588 | kfree(tmp1); | |
589 | } | |
4e8402a3 MH |
590 | } |
591 | ||
b62f328b VT |
592 | /* Find socket with cid and source bdaddr. |
593 | * Returns closest match, locked. | |
594 | */ | |
595 | static struct sock *l2cap_get_sock_by_scid(int state, __le16 cid, bdaddr_t *src) | |
596 | { | |
597 | struct sock *s, *sk = NULL, *sk1 = NULL; | |
598 | struct hlist_node *node; | |
599 | ||
600 | read_lock(&l2cap_sk_list.lock); | |
601 | ||
602 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
603 | if (state && sk->sk_state != state) | |
604 | continue; | |
605 | ||
606 | if (l2cap_pi(sk)->scid == cid) { | |
607 | /* Exact match. */ | |
608 | if (!bacmp(&bt_sk(sk)->src, src)) | |
609 | break; | |
610 | ||
611 | /* Closest match */ | |
612 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
613 | sk1 = sk; | |
614 | } | |
615 | } | |
616 | s = node ? sk : sk1; | |
617 | if (s) | |
618 | bh_lock_sock(s); | |
619 | read_unlock(&l2cap_sk_list.lock); | |
620 | ||
621 | return s; | |
622 | } | |
623 | ||
624 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
625 | { | |
626 | struct l2cap_chan_list *list = &conn->chan_list; | |
627 | struct sock *parent, *uninitialized_var(sk); | |
628 | ||
629 | BT_DBG(""); | |
630 | ||
631 | /* Check if we have socket listening on cid */ | |
632 | parent = l2cap_get_sock_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, | |
633 | conn->src); | |
634 | if (!parent) | |
635 | return; | |
636 | ||
637 | /* Check for backlog size */ | |
638 | if (sk_acceptq_is_full(parent)) { | |
639 | BT_DBG("backlog full %d", parent->sk_ack_backlog); | |
640 | goto clean; | |
641 | } | |
642 | ||
643 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); | |
644 | if (!sk) | |
645 | goto clean; | |
646 | ||
647 | write_lock_bh(&list->lock); | |
648 | ||
649 | hci_conn_hold(conn->hcon); | |
650 | ||
651 | l2cap_sock_init(sk, parent); | |
652 | bacpy(&bt_sk(sk)->src, conn->src); | |
653 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
654 | ||
655 | __l2cap_chan_add(conn, sk, parent); | |
656 | ||
657 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
658 | ||
659 | sk->sk_state = BT_CONNECTED; | |
660 | parent->sk_data_ready(parent, 0); | |
661 | ||
662 | write_unlock_bh(&list->lock); | |
663 | ||
664 | clean: | |
665 | bh_unlock_sock(parent); | |
666 | } | |
667 | ||
4e8402a3 MH |
668 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
669 | { | |
79d554a6 MH |
670 | struct l2cap_chan_list *l = &conn->chan_list; |
671 | struct sock *sk; | |
4e8402a3 | 672 | |
79d554a6 | 673 | BT_DBG("conn %p", conn); |
4e8402a3 | 674 | |
b62f328b VT |
675 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
676 | l2cap_le_conn_ready(conn); | |
677 | ||
79d554a6 | 678 | read_lock(&l->lock); |
4e8402a3 | 679 | |
79d554a6 MH |
680 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { |
681 | bh_lock_sock(sk); | |
4e8402a3 | 682 | |
acd7d370 VT |
683 | if (conn->hcon->type == LE_LINK) { |
684 | l2cap_sock_clear_timer(sk); | |
685 | sk->sk_state = BT_CONNECTED; | |
686 | sk->sk_state_change(sk); | |
687 | } | |
688 | ||
bd3c9e25 GP |
689 | if (sk->sk_type != SOCK_SEQPACKET && |
690 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
691 | l2cap_sock_clear_timer(sk); |
692 | sk->sk_state = BT_CONNECTED; | |
693 | sk->sk_state_change(sk); | |
694 | } else if (sk->sk_state == BT_CONNECT) | |
695 | l2cap_do_start(sk); | |
4e8402a3 | 696 | |
79d554a6 | 697 | bh_unlock_sock(sk); |
4e8402a3 | 698 | } |
79d554a6 MH |
699 | |
700 | read_unlock(&l->lock); | |
4e8402a3 MH |
701 | } |
702 | ||
703 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
704 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
705 | { | |
706 | struct l2cap_chan_list *l = &conn->chan_list; | |
707 | struct sock *sk; | |
708 | ||
709 | BT_DBG("conn %p", conn); | |
710 | ||
711 | read_lock(&l->lock); | |
712 | ||
713 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
2af6b9d5 | 714 | if (l2cap_pi(sk)->force_reliable) |
4e8402a3 MH |
715 | sk->sk_err = err; |
716 | } | |
717 | ||
718 | read_unlock(&l->lock); | |
719 | } | |
720 | ||
721 | static void l2cap_info_timeout(unsigned long arg) | |
722 | { | |
723 | struct l2cap_conn *conn = (void *) arg; | |
724 | ||
984947dc | 725 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 726 | conn->info_ident = 0; |
984947dc | 727 | |
4e8402a3 MH |
728 | l2cap_conn_start(conn); |
729 | } | |
730 | ||
1da177e4 LT |
731 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
732 | { | |
0139418c | 733 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 734 | |
0139418c | 735 | if (conn || status) |
1da177e4 LT |
736 | return conn; |
737 | ||
0139418c MH |
738 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
739 | if (!conn) | |
1da177e4 | 740 | return NULL; |
1da177e4 LT |
741 | |
742 | hcon->l2cap_data = conn; | |
743 | conn->hcon = hcon; | |
744 | ||
0139418c MH |
745 | BT_DBG("hcon %p conn %p", hcon, conn); |
746 | ||
acd7d370 VT |
747 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
748 | conn->mtu = hcon->hdev->le_mtu; | |
749 | else | |
750 | conn->mtu = hcon->hdev->acl_mtu; | |
751 | ||
1da177e4 LT |
752 | conn->src = &hcon->hdev->bdaddr; |
753 | conn->dst = &hcon->dst; | |
754 | ||
4e8402a3 MH |
755 | conn->feat_mask = 0; |
756 | ||
1da177e4 LT |
757 | spin_lock_init(&conn->lock); |
758 | rwlock_init(&conn->chan_list.lock); | |
759 | ||
b62f328b VT |
760 | if (hcon->type != LE_LINK) |
761 | setup_timer(&conn->info_timer, l2cap_info_timeout, | |
45054dc1 DY |
762 | (unsigned long) conn); |
763 | ||
2950f21a MH |
764 | conn->disc_reason = 0x13; |
765 | ||
1da177e4 LT |
766 | return conn; |
767 | } | |
768 | ||
0139418c | 769 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 770 | { |
0139418c | 771 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 LT |
772 | struct sock *sk; |
773 | ||
0139418c MH |
774 | if (!conn) |
775 | return; | |
1da177e4 LT |
776 | |
777 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
778 | ||
7585b97a | 779 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
780 | |
781 | /* Kill channels */ | |
782 | while ((sk = conn->chan_list.head)) { | |
783 | bh_lock_sock(sk); | |
784 | l2cap_chan_del(sk, err); | |
785 | bh_unlock_sock(sk); | |
786 | l2cap_sock_kill(sk); | |
787 | } | |
788 | ||
8e8440f5 DY |
789 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
790 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 791 | |
1da177e4 LT |
792 | hcon->l2cap_data = NULL; |
793 | kfree(conn); | |
1da177e4 LT |
794 | } |
795 | ||
796 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) | |
797 | { | |
798 | struct l2cap_chan_list *l = &conn->chan_list; | |
fd1278d7 | 799 | write_lock_bh(&l->lock); |
1da177e4 | 800 | __l2cap_chan_add(conn, sk, parent); |
fd1278d7 | 801 | write_unlock_bh(&l->lock); |
1da177e4 LT |
802 | } |
803 | ||
1da177e4 | 804 | /* ---- Socket interface ---- */ |
1da177e4 LT |
805 | |
806 | /* Find socket with psm and source bdaddr. | |
807 | * Returns closest match. | |
808 | */ | |
e0f0cb56 | 809 | static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
810 | { |
811 | struct sock *sk = NULL, *sk1 = NULL; | |
812 | struct hlist_node *node; | |
813 | ||
e0f0cb56 GP |
814 | read_lock(&l2cap_sk_list.lock); |
815 | ||
1da177e4 LT |
816 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
817 | if (state && sk->sk_state != state) | |
818 | continue; | |
819 | ||
820 | if (l2cap_pi(sk)->psm == psm) { | |
821 | /* Exact match. */ | |
822 | if (!bacmp(&bt_sk(sk)->src, src)) | |
823 | break; | |
824 | ||
825 | /* Closest match */ | |
826 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
827 | sk1 = sk; | |
828 | } | |
829 | } | |
1da177e4 | 830 | |
1da177e4 | 831 | read_unlock(&l2cap_sk_list.lock); |
e0f0cb56 GP |
832 | |
833 | return node ? sk : sk1; | |
1da177e4 LT |
834 | } |
835 | ||
4e34c50b | 836 | int l2cap_do_connect(struct sock *sk) |
1da177e4 LT |
837 | { |
838 | bdaddr_t *src = &bt_sk(sk)->src; | |
839 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
840 | struct l2cap_conn *conn; | |
841 | struct hci_conn *hcon; | |
842 | struct hci_dev *hdev; | |
09ab6f4c | 843 | __u8 auth_type; |
44d0e48e | 844 | int err; |
1da177e4 | 845 | |
f29972de MH |
846 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
847 | l2cap_pi(sk)->psm); | |
1da177e4 | 848 | |
af05b30b GP |
849 | hdev = hci_get_route(dst, src); |
850 | if (!hdev) | |
1da177e4 LT |
851 | return -EHOSTUNREACH; |
852 | ||
853 | hci_dev_lock_bh(hdev); | |
854 | ||
855 | err = -ENOMEM; | |
856 | ||
8556edd3 | 857 | auth_type = l2cap_get_auth_type(sk); |
09ab6f4c | 858 | |
acd7d370 VT |
859 | if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) |
860 | hcon = hci_connect(hdev, LE_LINK, dst, | |
2af6b9d5 | 861 | l2cap_pi(sk)->sec_level, auth_type); |
acd7d370 VT |
862 | else |
863 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
864 | l2cap_pi(sk)->sec_level, auth_type); | |
865 | ||
1da177e4 LT |
866 | if (!hcon) |
867 | goto done; | |
868 | ||
869 | conn = l2cap_conn_add(hcon, 0); | |
870 | if (!conn) { | |
871 | hci_conn_put(hcon); | |
872 | goto done; | |
873 | } | |
874 | ||
875 | err = 0; | |
876 | ||
877 | /* Update source addr of the socket */ | |
878 | bacpy(src, conn->src); | |
879 | ||
880 | l2cap_chan_add(conn, sk, NULL); | |
881 | ||
882 | sk->sk_state = BT_CONNECT; | |
883 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
884 | ||
885 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
886 | if (sk->sk_type != SOCK_SEQPACKET && |
887 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 888 | l2cap_sock_clear_timer(sk); |
d00ef24f JH |
889 | if (l2cap_check_security(sk)) |
890 | sk->sk_state = BT_CONNECTED; | |
79d554a6 MH |
891 | } else |
892 | l2cap_do_start(sk); | |
1da177e4 LT |
893 | } |
894 | ||
895 | done: | |
896 | hci_dev_unlock_bh(hdev); | |
897 | hci_dev_put(hdev); | |
898 | return err; | |
899 | } | |
900 | ||
dcba0dba | 901 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 GP |
902 | { |
903 | DECLARE_WAITQUEUE(wait, current); | |
904 | int err = 0; | |
905 | int timeo = HZ/5; | |
906 | ||
2b0b05dd | 907 | add_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
908 | while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
909 | set_current_state(TASK_INTERRUPTIBLE); | |
910 | ||
911 | if (!timeo) | |
912 | timeo = HZ/5; | |
913 | ||
914 | if (signal_pending(current)) { | |
915 | err = sock_intr_errno(timeo); | |
916 | break; | |
917 | } | |
918 | ||
919 | release_sock(sk); | |
920 | timeo = schedule_timeout(timeo); | |
921 | lock_sock(sk); | |
922 | ||
923 | err = sock_error(sk); | |
924 | if (err) | |
925 | break; | |
926 | } | |
927 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 928 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
929 | return err; |
930 | } | |
931 | ||
e90bac06 GP |
932 | static void l2cap_monitor_timeout(unsigned long arg) |
933 | { | |
934 | struct sock *sk = (void *) arg; | |
e90bac06 | 935 | |
0e98958d GP |
936 | BT_DBG("sk %p", sk); |
937 | ||
e686219a | 938 | bh_lock_sock(sk); |
e90bac06 | 939 | if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { |
9b108fc0 | 940 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); |
b13f5860 | 941 | bh_unlock_sock(sk); |
e90bac06 GP |
942 | return; |
943 | } | |
944 | ||
945 | l2cap_pi(sk)->retry_count++; | |
946 | __mod_monitor_timer(); | |
947 | ||
a2e12a2a | 948 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 949 | bh_unlock_sock(sk); |
e90bac06 GP |
950 | } |
951 | ||
952 | static void l2cap_retrans_timeout(unsigned long arg) | |
953 | { | |
954 | struct sock *sk = (void *) arg; | |
e90bac06 | 955 | |
0e98958d GP |
956 | BT_DBG("sk %p", sk); |
957 | ||
e686219a | 958 | bh_lock_sock(sk); |
e90bac06 GP |
959 | l2cap_pi(sk)->retry_count = 1; |
960 | __mod_monitor_timer(); | |
961 | ||
962 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
963 | ||
a2e12a2a | 964 | l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); |
e686219a | 965 | bh_unlock_sock(sk); |
e90bac06 GP |
966 | } |
967 | ||
1c2acffb | 968 | static void l2cap_drop_acked_frames(struct sock *sk) |
1da177e4 | 969 | { |
1c2acffb | 970 | struct sk_buff *skb; |
1da177e4 | 971 | |
812e737e GP |
972 | while ((skb = skb_peek(TX_QUEUE(sk))) && |
973 | l2cap_pi(sk)->unacked_frames) { | |
1c2acffb GP |
974 | if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) |
975 | break; | |
1da177e4 | 976 | |
1c2acffb GP |
977 | skb = skb_dequeue(TX_QUEUE(sk)); |
978 | kfree_skb(skb); | |
1da177e4 | 979 | |
1c2acffb GP |
980 | l2cap_pi(sk)->unacked_frames--; |
981 | } | |
1da177e4 | 982 | |
e90bac06 GP |
983 | if (!l2cap_pi(sk)->unacked_frames) |
984 | del_timer(&l2cap_pi(sk)->retrans_timer); | |
1c2acffb | 985 | } |
1da177e4 | 986 | |
fd83ccdb | 987 | void l2cap_do_send(struct sock *sk, struct sk_buff *skb) |
1c2acffb GP |
988 | { |
989 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
e702112f AE |
990 | struct hci_conn *hcon = pi->conn->hcon; |
991 | u16 flags; | |
1c2acffb GP |
992 | |
993 | BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); | |
1da177e4 | 994 | |
e702112f AE |
995 | if (!pi->flushable && lmp_no_flush_capable(hcon->hdev)) |
996 | flags = ACL_START_NO_FLUSH; | |
997 | else | |
998 | flags = ACL_START; | |
999 | ||
1000 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1001 | } |
1002 | ||
fd83ccdb | 1003 | void l2cap_streaming_send(struct sock *sk) |
6840ed07 | 1004 | { |
ccbb84af | 1005 | struct sk_buff *skb; |
6840ed07 | 1006 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1007 | u16 control, fcs; |
6840ed07 | 1008 | |
ccbb84af GP |
1009 | while ((skb = skb_dequeue(TX_QUEUE(sk)))) { |
1010 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); | |
6840ed07 | 1011 | control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1012 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1013 | |
e8235c6b | 1014 | if (pi->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1015 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1016 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1017 | } |
1018 | ||
ccbb84af | 1019 | l2cap_do_send(sk, skb); |
6840ed07 GP |
1020 | |
1021 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
6840ed07 | 1022 | } |
6840ed07 GP |
1023 | } |
1024 | ||
dfc909be | 1025 | static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) |
8f17154f GP |
1026 | { |
1027 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1028 | struct sk_buff *skb, *tx_skb; | |
1029 | u16 control, fcs; | |
8f17154f GP |
1030 | |
1031 | skb = skb_peek(TX_QUEUE(sk)); | |
f11d676d GP |
1032 | if (!skb) |
1033 | return; | |
8f17154f | 1034 | |
f11d676d GP |
1035 | do { |
1036 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1037 | break; |
8f17154f | 1038 | |
f11d676d GP |
1039 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) |
1040 | return; | |
8f17154f | 1041 | |
f11d676d | 1042 | } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); |
8f17154f | 1043 | |
f11d676d GP |
1044 | if (pi->remote_max_tx && |
1045 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1046 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
f11d676d GP |
1047 | return; |
1048 | } | |
1049 | ||
1050 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1051 | bt_cb(skb)->retries++; | |
1052 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
3cb123d1 GP |
1053 | |
1054 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { | |
1055 | control |= L2CAP_CTRL_FINAL; | |
1056 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1057 | } | |
95ffa978 | 1058 | |
f11d676d GP |
1059 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1060 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
3cb123d1 | 1061 | |
f11d676d GP |
1062 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1063 | ||
1064 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
1065 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); | |
1066 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1067 | } | |
1068 | ||
1069 | l2cap_do_send(sk, tx_skb); | |
8f17154f GP |
1070 | } |
1071 | ||
fd83ccdb | 1072 | int l2cap_ertm_send(struct sock *sk) |
1c2acffb GP |
1073 | { |
1074 | struct sk_buff *skb, *tx_skb; | |
1075 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
fcc203c3 | 1076 | u16 control, fcs; |
9a9c6a34 | 1077 | int nsent = 0; |
1c2acffb | 1078 | |
c13ffa62 GP |
1079 | if (sk->sk_state != BT_CONNECTED) |
1080 | return -ENOTCONN; | |
e90bac06 | 1081 | |
6e2b6722 | 1082 | while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { |
1c2acffb | 1083 | |
e90bac06 GP |
1084 | if (pi->remote_max_tx && |
1085 | bt_cb(skb)->retries == pi->remote_max_tx) { | |
9b108fc0 | 1086 | l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); |
e90bac06 GP |
1087 | break; |
1088 | } | |
1089 | ||
e420aba3 AE |
1090 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1091 | ||
e90bac06 GP |
1092 | bt_cb(skb)->retries++; |
1093 | ||
1c2acffb | 1094 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1095 | control &= L2CAP_CTRL_SAR; |
1096 | ||
d5392c8f GP |
1097 | if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { |
1098 | control |= L2CAP_CTRL_FINAL; | |
1099 | pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; | |
1100 | } | |
9f121a5a | 1101 | control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1c2acffb GP |
1102 | | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
1103 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); | |
1104 | ||
e90bac06 | 1105 | |
e8235c6b | 1106 | if (pi->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1107 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1108 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1109 | } | |
1110 | ||
9a9c6a34 GP |
1111 | l2cap_do_send(sk, tx_skb); |
1112 | ||
e90bac06 | 1113 | __mod_retrans_timer(); |
1c2acffb GP |
1114 | |
1115 | bt_cb(skb)->tx_seq = pi->next_tx_seq; | |
1116 | pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; | |
1117 | ||
1118 | pi->unacked_frames++; | |
d5392c8f | 1119 | pi->frames_sent++; |
1c2acffb GP |
1120 | |
1121 | if (skb_queue_is_last(TX_QUEUE(sk), skb)) | |
1122 | sk->sk_send_head = NULL; | |
1123 | else | |
1124 | sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); | |
9e917af1 GP |
1125 | |
1126 | nsent++; | |
1c2acffb GP |
1127 | } |
1128 | ||
9e917af1 GP |
1129 | return nsent; |
1130 | } | |
1131 | ||
dfc909be GP |
1132 | static int l2cap_retransmit_frames(struct sock *sk) |
1133 | { | |
1134 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1135 | int ret; | |
1136 | ||
dfc909be GP |
1137 | if (!skb_queue_empty(TX_QUEUE(sk))) |
1138 | sk->sk_send_head = TX_QUEUE(sk)->next; | |
1139 | ||
1140 | pi->next_tx_seq = pi->expected_ack_seq; | |
1141 | ret = l2cap_ertm_send(sk); | |
dfc909be GP |
1142 | return ret; |
1143 | } | |
1144 | ||
9a9c6a34 | 1145 | static void l2cap_send_ack(struct l2cap_pinfo *pi) |
9e917af1 GP |
1146 | { |
1147 | struct sock *sk = (struct sock *)pi; | |
1148 | u16 control = 0; | |
1149 | ||
1150 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1151 | ||
1152 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
1153 | control |= L2CAP_SUPER_RCV_NOT_READY; | |
1890d36b | 1154 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
9a9c6a34 GP |
1155 | l2cap_send_sframe(pi, control); |
1156 | return; | |
9e917af1 | 1157 | } |
dfc909be | 1158 | |
e0f66218 | 1159 | if (l2cap_ertm_send(sk) > 0) |
dfc909be GP |
1160 | return; |
1161 | ||
1162 | control |= L2CAP_SUPER_RCV_READY; | |
1163 | l2cap_send_sframe(pi, control); | |
1c2acffb GP |
1164 | } |
1165 | ||
9a9c6a34 | 1166 | static void l2cap_send_srejtail(struct sock *sk) |
99b0d4b7 GP |
1167 | { |
1168 | struct srej_list *tail; | |
1169 | u16 control; | |
1170 | ||
1171 | control = L2CAP_SUPER_SELECT_REJECT; | |
1172 | control |= L2CAP_CTRL_FINAL; | |
1173 | ||
1174 | tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); | |
1175 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
1176 | ||
1177 | l2cap_send_sframe(l2cap_pi(sk), control); | |
99b0d4b7 GP |
1178 | } |
1179 | ||
1c2acffb GP |
1180 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1181 | { | |
1182 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1183 | struct sk_buff **frag; | |
1184 | int err, sent = 0; | |
1da177e4 | 1185 | |
59203a21 | 1186 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1187 | return -EFAULT; |
1da177e4 LT |
1188 | |
1189 | sent += count; | |
1190 | len -= count; | |
1191 | ||
1192 | /* Continuation fragments (no L2CAP header) */ | |
1193 | frag = &skb_shinfo(skb)->frag_list; | |
1194 | while (len) { | |
1195 | count = min_t(unsigned int, conn->mtu, len); | |
1196 | ||
1197 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1198 | if (!*frag) | |
0175d629 | 1199 | return err; |
1c2acffb GP |
1200 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1201 | return -EFAULT; | |
1da177e4 LT |
1202 | |
1203 | sent += count; | |
1204 | len -= count; | |
1205 | ||
1206 | frag = &(*frag)->next; | |
1207 | } | |
1da177e4 LT |
1208 | |
1209 | return sent; | |
1c2acffb | 1210 | } |
1da177e4 | 1211 | |
fd83ccdb | 1212 | struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1213 | { |
1214 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1215 | struct sk_buff *skb; | |
1216 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1217 | struct l2cap_hdr *lh; | |
1218 | ||
1219 | BT_DBG("sk %p len %d", sk, (int)len); | |
1220 | ||
1221 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1222 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1223 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1224 | if (!skb) | |
0175d629 | 1225 | return ERR_PTR(err); |
1c2acffb GP |
1226 | |
1227 | /* Create L2CAP header */ | |
1228 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1229 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1230 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1231 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1232 | ||
1233 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1234 | if (unlikely(err < 0)) { | |
1235 | kfree_skb(skb); | |
1236 | return ERR_PTR(err); | |
1237 | } | |
1238 | return skb; | |
1239 | } | |
1240 | ||
fd83ccdb | 1241 | struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1242 | { |
1243 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1244 | struct sk_buff *skb; | |
1245 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1246 | struct l2cap_hdr *lh; | |
1247 | ||
1248 | BT_DBG("sk %p len %d", sk, (int)len); | |
1249 | ||
1250 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1251 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1252 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1253 | if (!skb) | |
0175d629 | 1254 | return ERR_PTR(err); |
1c2acffb GP |
1255 | |
1256 | /* Create L2CAP header */ | |
1257 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1258 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1259 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1260 | ||
1261 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1262 | if (unlikely(err < 0)) { | |
1263 | kfree_skb(skb); | |
1264 | return ERR_PTR(err); | |
1265 | } | |
1266 | return skb; | |
1267 | } | |
1268 | ||
fd83ccdb | 1269 | struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb GP |
1270 | { |
1271 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1272 | struct sk_buff *skb; | |
1273 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1274 | struct l2cap_hdr *lh; | |
1275 | ||
1276 | BT_DBG("sk %p len %d", sk, (int)len); | |
1277 | ||
0ee0d208 GP |
1278 | if (!conn) |
1279 | return ERR_PTR(-ENOTCONN); | |
1280 | ||
c74e560c GP |
1281 | if (sdulen) |
1282 | hlen += 2; | |
1283 | ||
fcc203c3 GP |
1284 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1285 | hlen += 2; | |
1286 | ||
1c2acffb GP |
1287 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1288 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1289 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1290 | if (!skb) | |
0175d629 | 1291 | return ERR_PTR(err); |
1c2acffb GP |
1292 | |
1293 | /* Create L2CAP header */ | |
1294 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1295 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1296 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1297 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1298 | if (sdulen) |
1299 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1300 | |
1301 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1302 | if (unlikely(err < 0)) { | |
1303 | kfree_skb(skb); | |
1304 | return ERR_PTR(err); | |
1305 | } | |
e90bac06 | 1306 | |
fcc203c3 GP |
1307 | if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) |
1308 | put_unaligned_le16(0, skb_put(skb, 2)); | |
1309 | ||
e90bac06 | 1310 | bt_cb(skb)->retries = 0; |
1c2acffb | 1311 | return skb; |
1da177e4 LT |
1312 | } |
1313 | ||
fd83ccdb | 1314 | int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) |
c74e560c GP |
1315 | { |
1316 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1317 | struct sk_buff *skb; | |
1318 | struct sk_buff_head sar_queue; | |
1319 | u16 control; | |
1320 | size_t size = 0; | |
1321 | ||
ff12fd64 | 1322 | skb_queue_head_init(&sar_queue); |
c74e560c | 1323 | control = L2CAP_SDU_START; |
1c762159 | 1324 | skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); |
c74e560c GP |
1325 | if (IS_ERR(skb)) |
1326 | return PTR_ERR(skb); | |
1327 | ||
1328 | __skb_queue_tail(&sar_queue, skb); | |
1c762159 GP |
1329 | len -= pi->remote_mps; |
1330 | size += pi->remote_mps; | |
c74e560c GP |
1331 | |
1332 | while (len > 0) { | |
1333 | size_t buflen; | |
1334 | ||
1c762159 | 1335 | if (len > pi->remote_mps) { |
44651b85 | 1336 | control = L2CAP_SDU_CONTINUE; |
1c762159 | 1337 | buflen = pi->remote_mps; |
c74e560c | 1338 | } else { |
44651b85 | 1339 | control = L2CAP_SDU_END; |
c74e560c GP |
1340 | buflen = len; |
1341 | } | |
1342 | ||
6840ed07 | 1343 | skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); |
c74e560c GP |
1344 | if (IS_ERR(skb)) { |
1345 | skb_queue_purge(&sar_queue); | |
1346 | return PTR_ERR(skb); | |
1347 | } | |
1348 | ||
1349 | __skb_queue_tail(&sar_queue, skb); | |
1350 | len -= buflen; | |
1351 | size += buflen; | |
c74e560c GP |
1352 | } |
1353 | skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); | |
1354 | if (sk->sk_send_head == NULL) | |
1355 | sk->sk_send_head = sar_queue.next; | |
1356 | ||
1357 | return size; | |
1358 | } | |
1359 | ||
1da177e4 LT |
1360 | static void l2cap_chan_ready(struct sock *sk) |
1361 | { | |
1362 | struct sock *parent = bt_sk(sk)->parent; | |
1363 | ||
1364 | BT_DBG("sk %p, parent %p", sk, parent); | |
1365 | ||
1366 | l2cap_pi(sk)->conf_state = 0; | |
1367 | l2cap_sock_clear_timer(sk); | |
1368 | ||
1369 | if (!parent) { | |
1370 | /* Outgoing channel. | |
1371 | * Wake up socket sleeping on connect. | |
1372 | */ | |
1373 | sk->sk_state = BT_CONNECTED; | |
1374 | sk->sk_state_change(sk); | |
1375 | } else { | |
1376 | /* Incoming channel. | |
1377 | * Wake up socket sleeping on accept. | |
1378 | */ | |
1379 | parent->sk_data_ready(parent, 0); | |
1380 | } | |
1381 | } | |
1382 | ||
1383 | /* Copy frame to all raw sockets on that connection */ | |
1384 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1385 | { | |
1386 | struct l2cap_chan_list *l = &conn->chan_list; | |
1387 | struct sk_buff *nskb; | |
af05b30b | 1388 | struct sock *sk; |
1da177e4 LT |
1389 | |
1390 | BT_DBG("conn %p", conn); | |
1391 | ||
1392 | read_lock(&l->lock); | |
1393 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
1394 | if (sk->sk_type != SOCK_RAW) | |
1395 | continue; | |
1396 | ||
1397 | /* Don't send frame to the socket it came from */ | |
1398 | if (skb->sk == sk) | |
1399 | continue; | |
af05b30b GP |
1400 | nskb = skb_clone(skb, GFP_ATOMIC); |
1401 | if (!nskb) | |
1da177e4 LT |
1402 | continue; |
1403 | ||
1404 | if (sock_queue_rcv_skb(sk, nskb)) | |
1405 | kfree_skb(nskb); | |
1406 | } | |
1407 | read_unlock(&l->lock); | |
1408 | } | |
1409 | ||
1410 | /* ---- L2CAP signalling commands ---- */ | |
1411 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1412 | u8 code, u8 ident, u16 dlen, void *data) | |
1413 | { | |
1414 | struct sk_buff *skb, **frag; | |
1415 | struct l2cap_cmd_hdr *cmd; | |
1416 | struct l2cap_hdr *lh; | |
1417 | int len, count; | |
1418 | ||
af05b30b GP |
1419 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1420 | conn, code, ident, dlen); | |
1da177e4 LT |
1421 | |
1422 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1423 | count = min_t(unsigned int, conn->mtu, len); | |
1424 | ||
1425 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1426 | if (!skb) | |
1427 | return NULL; | |
1428 | ||
1429 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1430 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1431 | |
1432 | if (conn->hcon->type == LE_LINK) | |
1433 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1434 | else | |
1435 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1436 | |
1437 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1438 | cmd->code = code; | |
1439 | cmd->ident = ident; | |
aca3192c | 1440 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1441 | |
1442 | if (dlen) { | |
1443 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1444 | memcpy(skb_put(skb, count), data, count); | |
1445 | data += count; | |
1446 | } | |
1447 | ||
1448 | len -= skb->len; | |
1449 | ||
1450 | /* Continuation fragments (no L2CAP header) */ | |
1451 | frag = &skb_shinfo(skb)->frag_list; | |
1452 | while (len) { | |
1453 | count = min_t(unsigned int, conn->mtu, len); | |
1454 | ||
1455 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1456 | if (!*frag) | |
1457 | goto fail; | |
1458 | ||
1459 | memcpy(skb_put(*frag, count), data, count); | |
1460 | ||
1461 | len -= count; | |
1462 | data += count; | |
1463 | ||
1464 | frag = &(*frag)->next; | |
1465 | } | |
1466 | ||
1467 | return skb; | |
1468 | ||
1469 | fail: | |
1470 | kfree_skb(skb); | |
1471 | return NULL; | |
1472 | } | |
1473 | ||
1474 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1475 | { | |
1476 | struct l2cap_conf_opt *opt = *ptr; | |
1477 | int len; | |
1478 | ||
1479 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1480 | *ptr += len; | |
1481 | ||
1482 | *type = opt->type; | |
1483 | *olen = opt->len; | |
1484 | ||
1485 | switch (opt->len) { | |
1486 | case 1: | |
1487 | *val = *((u8 *) opt->val); | |
1488 | break; | |
1489 | ||
1490 | case 2: | |
bfaaeb3e | 1491 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1492 | break; |
1493 | ||
1494 | case 4: | |
bfaaeb3e | 1495 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1496 | break; |
1497 | ||
1498 | default: | |
1499 | *val = (unsigned long) opt->val; | |
1500 | break; | |
1501 | } | |
1502 | ||
1503 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1504 | return len; | |
1505 | } | |
1506 | ||
1da177e4 LT |
1507 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1508 | { | |
1509 | struct l2cap_conf_opt *opt = *ptr; | |
1510 | ||
1511 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1512 | ||
1513 | opt->type = type; | |
1514 | opt->len = len; | |
1515 | ||
1516 | switch (len) { | |
1517 | case 1: | |
1518 | *((u8 *) opt->val) = val; | |
1519 | break; | |
1520 | ||
1521 | case 2: | |
4f8b691c | 1522 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1523 | break; |
1524 | ||
1525 | case 4: | |
4f8b691c | 1526 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1527 | break; |
1528 | ||
1529 | default: | |
1530 | memcpy(opt->val, (void *) val, len); | |
1531 | break; | |
1532 | } | |
1533 | ||
1534 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1535 | } | |
1536 | ||
c1b4f43b GP |
1537 | static void l2cap_ack_timeout(unsigned long arg) |
1538 | { | |
1539 | struct sock *sk = (void *) arg; | |
1540 | ||
1541 | bh_lock_sock(sk); | |
1542 | l2cap_send_ack(l2cap_pi(sk)); | |
1543 | bh_unlock_sock(sk); | |
1544 | } | |
1545 | ||
0565c1c2 GP |
1546 | static inline void l2cap_ertm_init(struct sock *sk) |
1547 | { | |
1548 | l2cap_pi(sk)->expected_ack_seq = 0; | |
1549 | l2cap_pi(sk)->unacked_frames = 0; | |
1550 | l2cap_pi(sk)->buffer_seq = 0; | |
803020c6 | 1551 | l2cap_pi(sk)->num_acked = 0; |
d5392c8f | 1552 | l2cap_pi(sk)->frames_sent = 0; |
0565c1c2 GP |
1553 | |
1554 | setup_timer(&l2cap_pi(sk)->retrans_timer, | |
1555 | l2cap_retrans_timeout, (unsigned long) sk); | |
1556 | setup_timer(&l2cap_pi(sk)->monitor_timer, | |
1557 | l2cap_monitor_timeout, (unsigned long) sk); | |
c1b4f43b GP |
1558 | setup_timer(&l2cap_pi(sk)->ack_timer, |
1559 | l2cap_ack_timeout, (unsigned long) sk); | |
0565c1c2 GP |
1560 | |
1561 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b GP |
1562 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
1563 | ||
1564 | INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); | |
218bb9df GP |
1565 | |
1566 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1567 | } |
1568 | ||
f2fcfcd6 GP |
1569 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1570 | { | |
1571 | switch (mode) { | |
1572 | case L2CAP_MODE_STREAMING: | |
1573 | case L2CAP_MODE_ERTM: | |
1574 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1575 | return mode; | |
1576 | /* fall through */ | |
1577 | default: | |
1578 | return L2CAP_MODE_BASIC; | |
1579 | } | |
1580 | } | |
1581 | ||
68983259 | 1582 | int l2cap_build_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1583 | { |
1584 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1585 | struct l2cap_conf_req *req = data; | |
bd3c9e25 | 1586 | struct l2cap_conf_rfc rfc = { .mode = pi->mode }; |
1da177e4 LT |
1587 | void *ptr = req->data; |
1588 | ||
1589 | BT_DBG("sk %p", sk); | |
1590 | ||
f2fcfcd6 GP |
1591 | if (pi->num_conf_req || pi->num_conf_rsp) |
1592 | goto done; | |
1593 | ||
1594 | switch (pi->mode) { | |
1595 | case L2CAP_MODE_STREAMING: | |
1596 | case L2CAP_MODE_ERTM: | |
2ba13ed6 | 1597 | if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1598 | break; |
85eb53c6 | 1599 | |
2ba13ed6 | 1600 | /* fall through */ |
f2fcfcd6 GP |
1601 | default: |
1602 | pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); | |
1603 | break; | |
1604 | } | |
1605 | ||
1606 | done: | |
7990681c GP |
1607 | if (pi->imtu != L2CAP_DEFAULT_MTU) |
1608 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
1609 | ||
65c7c491 MH |
1610 | switch (pi->mode) { |
1611 | case L2CAP_MODE_BASIC: | |
63406504 GP |
1612 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1613 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
1614 | break; | |
1615 | ||
62547752 GP |
1616 | rfc.mode = L2CAP_MODE_BASIC; |
1617 | rfc.txwin_size = 0; | |
1618 | rfc.max_transmit = 0; | |
1619 | rfc.retrans_timeout = 0; | |
1620 | rfc.monitor_timeout = 0; | |
1621 | rfc.max_pdu_size = 0; | |
1622 | ||
63406504 GP |
1623 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1624 | (unsigned long) &rfc); | |
65c7c491 MH |
1625 | break; |
1626 | ||
1627 | case L2CAP_MODE_ERTM: | |
1628 | rfc.mode = L2CAP_MODE_ERTM; | |
14b5aa71 | 1629 | rfc.txwin_size = pi->tx_win; |
68d7f0ce | 1630 | rfc.max_transmit = pi->max_tx; |
f2fcfcd6 GP |
1631 | rfc.retrans_timeout = 0; |
1632 | rfc.monitor_timeout = 0; | |
c74e560c | 1633 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1634 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1635 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 1636 | |
63406504 GP |
1637 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1638 | (unsigned long) &rfc); | |
1639 | ||
fcc203c3 GP |
1640 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1641 | break; | |
1642 | ||
1643 | if (pi->fcs == L2CAP_FCS_NONE || | |
1644 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1645 | pi->fcs = L2CAP_FCS_NONE; | |
1646 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1647 | } | |
f2fcfcd6 GP |
1648 | break; |
1649 | ||
1650 | case L2CAP_MODE_STREAMING: | |
1651 | rfc.mode = L2CAP_MODE_STREAMING; | |
1652 | rfc.txwin_size = 0; | |
1653 | rfc.max_transmit = 0; | |
1654 | rfc.retrans_timeout = 0; | |
1655 | rfc.monitor_timeout = 0; | |
c74e560c | 1656 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1657 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1658 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 1659 | |
63406504 GP |
1660 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1661 | (unsigned long) &rfc); | |
1662 | ||
fcc203c3 GP |
1663 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1664 | break; | |
1665 | ||
1666 | if (pi->fcs == L2CAP_FCS_NONE || | |
1667 | pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { | |
1668 | pi->fcs = L2CAP_FCS_NONE; | |
1669 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); | |
1670 | } | |
65c7c491 MH |
1671 | break; |
1672 | } | |
1da177e4 | 1673 | |
aca3192c YH |
1674 | req->dcid = cpu_to_le16(pi->dcid); |
1675 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1676 | |
1677 | return ptr - data; | |
1678 | } | |
1679 | ||
5dee9e7c | 1680 | static int l2cap_parse_conf_req(struct sock *sk, void *data) |
1da177e4 LT |
1681 | { |
1682 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
5dee9e7c MH |
1683 | struct l2cap_conf_rsp *rsp = data; |
1684 | void *ptr = rsp->data; | |
1685 | void *req = pi->conf_req; | |
1686 | int len = pi->conf_len; | |
1687 | int type, hint, olen; | |
1688 | unsigned long val; | |
6464f35f | 1689 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1690 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1691 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1692 | |
5dee9e7c | 1693 | BT_DBG("sk %p", sk); |
820ae1b8 | 1694 | |
5dee9e7c MH |
1695 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1696 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1697 | |
589d2746 | 1698 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1699 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1700 | |
1701 | switch (type) { | |
1702 | case L2CAP_CONF_MTU: | |
861d6882 | 1703 | mtu = val; |
5dee9e7c MH |
1704 | break; |
1705 | ||
1706 | case L2CAP_CONF_FLUSH_TO: | |
1707 | pi->flush_to = val; | |
1708 | break; | |
1709 | ||
1710 | case L2CAP_CONF_QOS: | |
1711 | break; | |
1712 | ||
6464f35f MH |
1713 | case L2CAP_CONF_RFC: |
1714 | if (olen == sizeof(rfc)) | |
1715 | memcpy(&rfc, (void *) val, olen); | |
1716 | break; | |
1717 | ||
fcc203c3 GP |
1718 | case L2CAP_CONF_FCS: |
1719 | if (val == L2CAP_FCS_NONE) | |
1720 | pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; | |
1721 | ||
1722 | break; | |
1723 | ||
5dee9e7c MH |
1724 | default: |
1725 | if (hint) | |
1726 | break; | |
1727 | ||
1728 | result = L2CAP_CONF_UNKNOWN; | |
1729 | *((u8 *) ptr++) = type; | |
1730 | break; | |
1731 | } | |
1732 | } | |
1733 | ||
e9aeb2dd | 1734 | if (pi->num_conf_rsp || pi->num_conf_req > 1) |
f2fcfcd6 GP |
1735 | goto done; |
1736 | ||
1737 | switch (pi->mode) { | |
1738 | case L2CAP_MODE_STREAMING: | |
1739 | case L2CAP_MODE_ERTM: | |
85eb53c6 GP |
1740 | if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
1741 | pi->mode = l2cap_select_mode(rfc.mode, | |
1742 | pi->conn->feat_mask); | |
1743 | break; | |
1744 | } | |
1745 | ||
742e519b | 1746 | if (pi->mode != rfc.mode) |
f2fcfcd6 | 1747 | return -ECONNREFUSED; |
742e519b | 1748 | |
f2fcfcd6 | 1749 | break; |
f2fcfcd6 GP |
1750 | } |
1751 | ||
1752 | done: | |
1753 | if (pi->mode != rfc.mode) { | |
1754 | result = L2CAP_CONF_UNACCEPT; | |
1755 | rfc.mode = pi->mode; | |
1756 | ||
1757 | if (pi->num_conf_rsp == 1) | |
1758 | return -ECONNREFUSED; | |
1759 | ||
1760 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1761 | sizeof(rfc), (unsigned long) &rfc); | |
1762 | } | |
1763 | ||
1764 | ||
5dee9e7c MH |
1765 | if (result == L2CAP_CONF_SUCCESS) { |
1766 | /* Configure output options and let the other side know | |
1767 | * which ones we don't like. */ | |
1768 | ||
f2fcfcd6 GP |
1769 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
1770 | result = L2CAP_CONF_UNACCEPT; | |
1771 | else { | |
1772 | pi->omtu = mtu; | |
1773 | pi->conf_state |= L2CAP_CONF_MTU_DONE; | |
1774 | } | |
1775 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); | |
6464f35f | 1776 | |
f2fcfcd6 GP |
1777 | switch (rfc.mode) { |
1778 | case L2CAP_MODE_BASIC: | |
1779 | pi->fcs = L2CAP_FCS_NONE; | |
1780 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
1781 | break; | |
1782 | ||
1783 | case L2CAP_MODE_ERTM: | |
1784 | pi->remote_tx_win = rfc.txwin_size; | |
1785 | pi->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
1786 | |
1787 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
1788 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
1789 | |
1790 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 | 1791 | |
10467e9e GP |
1792 | rfc.retrans_timeout = |
1793 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
1794 | rfc.monitor_timeout = | |
1795 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 GP |
1796 | |
1797 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1798 | |
1799 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1800 | sizeof(rfc), (unsigned long) &rfc); | |
1801 | ||
f2fcfcd6 GP |
1802 | break; |
1803 | ||
1804 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
1805 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
1806 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 GP |
1807 | |
1808 | pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
1809 | |
1810 | pi->conf_state |= L2CAP_CONF_MODE_DONE; | |
68ae6639 GP |
1811 | |
1812 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1813 | sizeof(rfc), (unsigned long) &rfc); | |
1814 | ||
f2fcfcd6 GP |
1815 | break; |
1816 | ||
1817 | default: | |
5dee9e7c | 1818 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1819 | |
6464f35f | 1820 | memset(&rfc, 0, sizeof(rfc)); |
f2fcfcd6 GP |
1821 | rfc.mode = pi->mode; |
1822 | } | |
6464f35f | 1823 | |
f2fcfcd6 GP |
1824 | if (result == L2CAP_CONF_SUCCESS) |
1825 | pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; | |
1826 | } | |
5dee9e7c MH |
1827 | rsp->scid = cpu_to_le16(pi->dcid); |
1828 | rsp->result = cpu_to_le16(result); | |
1829 | rsp->flags = cpu_to_le16(0x0000); | |
1830 | ||
1831 | return ptr - data; | |
1da177e4 LT |
1832 | } |
1833 | ||
f2fcfcd6 GP |
1834 | static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) |
1835 | { | |
1836 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1837 | struct l2cap_conf_req *req = data; | |
1838 | void *ptr = req->data; | |
1839 | int type, olen; | |
1840 | unsigned long val; | |
1841 | struct l2cap_conf_rfc rfc; | |
1842 | ||
1843 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
1844 | ||
1845 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1846 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1847 | ||
1848 | switch (type) { | |
1849 | case L2CAP_CONF_MTU: | |
1850 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
1851 | *result = L2CAP_CONF_UNACCEPT; | |
8183b775 | 1852 | pi->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 1853 | } else |
8183b775 AE |
1854 | pi->imtu = val; |
1855 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); | |
f2fcfcd6 GP |
1856 | break; |
1857 | ||
1858 | case L2CAP_CONF_FLUSH_TO: | |
1859 | pi->flush_to = val; | |
1860 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, | |
1861 | 2, pi->flush_to); | |
1862 | break; | |
1863 | ||
1864 | case L2CAP_CONF_RFC: | |
1865 | if (olen == sizeof(rfc)) | |
1866 | memcpy(&rfc, (void *)val, olen); | |
1867 | ||
1868 | if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && | |
1869 | rfc.mode != pi->mode) | |
1870 | return -ECONNREFUSED; | |
1871 | ||
f2fcfcd6 GP |
1872 | pi->fcs = 0; |
1873 | ||
1874 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1875 | sizeof(rfc), (unsigned long) &rfc); | |
1876 | break; | |
1877 | } | |
1878 | } | |
1879 | ||
6c2ea7a8 GP |
1880 | if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) |
1881 | return -ECONNREFUSED; | |
1882 | ||
1883 | pi->mode = rfc.mode; | |
1884 | ||
f2fcfcd6 GP |
1885 | if (*result == L2CAP_CONF_SUCCESS) { |
1886 | switch (rfc.mode) { | |
1887 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1888 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1889 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1c762159 | 1890 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1891 | break; |
1892 | case L2CAP_MODE_STREAMING: | |
1c762159 | 1893 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1894 | } |
1895 | } | |
1896 | ||
1897 | req->dcid = cpu_to_le16(pi->dcid); | |
1898 | req->flags = cpu_to_le16(0x0000); | |
1899 | ||
1900 | return ptr - data; | |
1901 | } | |
1902 | ||
5dee9e7c | 1903 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1904 | { |
1905 | struct l2cap_conf_rsp *rsp = data; | |
1906 | void *ptr = rsp->data; | |
1da177e4 | 1907 | |
5dee9e7c | 1908 | BT_DBG("sk %p", sk); |
1da177e4 | 1909 | |
aca3192c | 1910 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1911 | rsp->result = cpu_to_le16(result); |
aca3192c | 1912 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1913 | |
1914 | return ptr - data; | |
1915 | } | |
1916 | ||
7b1c0049 GP |
1917 | static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) |
1918 | { | |
1919 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
1920 | int type, olen; | |
1921 | unsigned long val; | |
1922 | struct l2cap_conf_rfc rfc; | |
1923 | ||
1924 | BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); | |
1925 | ||
1926 | if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) | |
1927 | return; | |
1928 | ||
1929 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1930 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1931 | ||
1932 | switch (type) { | |
1933 | case L2CAP_CONF_RFC: | |
1934 | if (olen == sizeof(rfc)) | |
1935 | memcpy(&rfc, (void *)val, olen); | |
1936 | goto done; | |
1937 | } | |
1938 | } | |
1939 | ||
1940 | done: | |
1941 | switch (rfc.mode) { | |
1942 | case L2CAP_MODE_ERTM: | |
10467e9e GP |
1943 | pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1944 | pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
7b1c0049 GP |
1945 | pi->mps = le16_to_cpu(rfc.max_pdu_size); |
1946 | break; | |
1947 | case L2CAP_MODE_STREAMING: | |
1948 | pi->mps = le16_to_cpu(rfc.max_pdu_size); | |
1949 | } | |
1950 | } | |
1951 | ||
4e8402a3 MH |
1952 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1953 | { | |
1954 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
1955 | ||
1956 | if (rej->reason != 0x0000) | |
1957 | return 0; | |
1958 | ||
1959 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
1960 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 1961 | del_timer(&conn->info_timer); |
984947dc MH |
1962 | |
1963 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 1964 | conn->info_ident = 0; |
984947dc | 1965 | |
4e8402a3 MH |
1966 | l2cap_conn_start(conn); |
1967 | } | |
1968 | ||
1969 | return 0; | |
1970 | } | |
1971 | ||
1da177e4 LT |
1972 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
1973 | { | |
1974 | struct l2cap_chan_list *list = &conn->chan_list; | |
1975 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; | |
1976 | struct l2cap_conn_rsp rsp; | |
d793fe8c | 1977 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 1978 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
1979 | |
1980 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 1981 | __le16 psm = req->psm; |
1da177e4 LT |
1982 | |
1983 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
1984 | ||
1985 | /* Check if we have socket listening on psm */ | |
1986 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
1987 | if (!parent) { | |
1988 | result = L2CAP_CR_BAD_PSM; | |
1989 | goto sendresp; | |
1990 | } | |
1991 | ||
e0f0cb56 GP |
1992 | bh_lock_sock(parent); |
1993 | ||
e7c29cb1 MH |
1994 | /* Check if the ACL is secure enough (if not SDP) */ |
1995 | if (psm != cpu_to_le16(0x0001) && | |
1996 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 1997 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
1998 | result = L2CAP_CR_SEC_BLOCK; |
1999 | goto response; | |
2000 | } | |
2001 | ||
1da177e4 LT |
2002 | result = L2CAP_CR_NO_MEM; |
2003 | ||
2004 | /* Check for backlog size */ | |
2005 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2006 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2007 | goto response; |
2008 | } | |
2009 | ||
3b1e0a65 | 2010 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2011 | if (!sk) |
2012 | goto response; | |
2013 | ||
fd1278d7 | 2014 | write_lock_bh(&list->lock); |
1da177e4 LT |
2015 | |
2016 | /* Check if we already have channel with that dcid */ | |
2017 | if (__l2cap_get_chan_by_dcid(list, scid)) { | |
fd1278d7 | 2018 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2019 | sock_set_flag(sk, SOCK_ZAPPED); |
2020 | l2cap_sock_kill(sk); | |
2021 | goto response; | |
2022 | } | |
2023 | ||
2024 | hci_conn_hold(conn->hcon); | |
2025 | ||
2026 | l2cap_sock_init(sk, parent); | |
2027 | bacpy(&bt_sk(sk)->src, conn->src); | |
2028 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2029 | l2cap_pi(sk)->psm = psm; | |
2030 | l2cap_pi(sk)->dcid = scid; | |
2031 | ||
2032 | __l2cap_chan_add(conn, sk, parent); | |
2033 | dcid = l2cap_pi(sk)->scid; | |
2034 | ||
2035 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2036 | ||
1da177e4 LT |
2037 | l2cap_pi(sk)->ident = cmd->ident; |
2038 | ||
984947dc | 2039 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
2af6b9d5 | 2040 | if (l2cap_check_security(sk)) { |
f66dc81f MH |
2041 | if (bt_sk(sk)->defer_setup) { |
2042 | sk->sk_state = BT_CONNECT2; | |
2043 | result = L2CAP_CR_PEND; | |
2044 | status = L2CAP_CS_AUTHOR_PEND; | |
2045 | parent->sk_data_ready(parent, 0); | |
2046 | } else { | |
2047 | sk->sk_state = BT_CONFIG; | |
2048 | result = L2CAP_CR_SUCCESS; | |
2049 | status = L2CAP_CS_NO_INFO; | |
2050 | } | |
79d554a6 MH |
2051 | } else { |
2052 | sk->sk_state = BT_CONNECT2; | |
2053 | result = L2CAP_CR_PEND; | |
2054 | status = L2CAP_CS_AUTHEN_PEND; | |
2055 | } | |
2056 | } else { | |
2057 | sk->sk_state = BT_CONNECT2; | |
2058 | result = L2CAP_CR_PEND; | |
2059 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2060 | } |
2061 | ||
fd1278d7 | 2062 | write_unlock_bh(&list->lock); |
1da177e4 LT |
2063 | |
2064 | response: | |
2065 | bh_unlock_sock(parent); | |
2066 | ||
2067 | sendresp: | |
aca3192c YH |
2068 | rsp.scid = cpu_to_le16(scid); |
2069 | rsp.dcid = cpu_to_le16(dcid); | |
2070 | rsp.result = cpu_to_le16(result); | |
2071 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2072 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2073 | |
2074 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2075 | struct l2cap_info_req info; | |
2076 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2077 | ||
2078 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2079 | conn->info_ident = l2cap_get_ident(conn); | |
2080 | ||
2081 | mod_timer(&conn->info_timer, jiffies + | |
2082 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2083 | ||
2084 | l2cap_send_cmd(conn, conn->info_ident, | |
2085 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2086 | } | |
2087 | ||
d793fe8c | 2088 | if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2089 | result == L2CAP_CR_SUCCESS) { |
2090 | u8 buf[128]; | |
2091 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2092 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, | |
2093 | l2cap_build_conf_req(sk, buf), buf); | |
2094 | l2cap_pi(sk)->num_conf_req++; | |
2095 | } | |
2096 | ||
1da177e4 LT |
2097 | return 0; |
2098 | } | |
2099 | ||
2100 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2101 | { | |
2102 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2103 | u16 scid, dcid, result, status; | |
2104 | struct sock *sk; | |
2105 | u8 req[128]; | |
2106 | ||
2107 | scid = __le16_to_cpu(rsp->scid); | |
2108 | dcid = __le16_to_cpu(rsp->dcid); | |
2109 | result = __le16_to_cpu(rsp->result); | |
2110 | status = __le16_to_cpu(rsp->status); | |
2111 | ||
2112 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2113 | ||
2114 | if (scid) { | |
af05b30b GP |
2115 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2116 | if (!sk) | |
57d3b22b | 2117 | return -EFAULT; |
1da177e4 | 2118 | } else { |
af05b30b GP |
2119 | sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); |
2120 | if (!sk) | |
57d3b22b | 2121 | return -EFAULT; |
1da177e4 LT |
2122 | } |
2123 | ||
2124 | switch (result) { | |
2125 | case L2CAP_CR_SUCCESS: | |
2126 | sk->sk_state = BT_CONFIG; | |
2127 | l2cap_pi(sk)->ident = 0; | |
2128 | l2cap_pi(sk)->dcid = dcid; | |
6a8d3010 MH |
2129 | l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
2130 | ||
e9aeb2dd GP |
2131 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) |
2132 | break; | |
2133 | ||
2134 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; | |
2135 | ||
1da177e4 LT |
2136 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
2137 | l2cap_build_conf_req(sk, req), req); | |
f2fcfcd6 | 2138 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2139 | break; |
2140 | ||
2141 | case L2CAP_CR_PEND: | |
6a8d3010 | 2142 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2143 | break; |
2144 | ||
2145 | default: | |
a49184c2 AE |
2146 | /* don't delete l2cap channel if sk is owned by user */ |
2147 | if (sock_owned_by_user(sk)) { | |
2148 | sk->sk_state = BT_DISCONN; | |
2149 | l2cap_sock_clear_timer(sk); | |
2150 | l2cap_sock_set_timer(sk, HZ / 5); | |
2151 | break; | |
2152 | } | |
2153 | ||
1da177e4 LT |
2154 | l2cap_chan_del(sk, ECONNREFUSED); |
2155 | break; | |
2156 | } | |
2157 | ||
2158 | bh_unlock_sock(sk); | |
2159 | return 0; | |
2160 | } | |
2161 | ||
8c462b60 MM |
2162 | static inline void set_default_fcs(struct l2cap_pinfo *pi) |
2163 | { | |
2164 | /* FCS is enabled only in ERTM or streaming mode, if one or both | |
2165 | * sides request it. | |
2166 | */ | |
2167 | if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING) | |
2168 | pi->fcs = L2CAP_FCS_NONE; | |
2169 | else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV)) | |
2170 | pi->fcs = L2CAP_FCS_CRC16; | |
2171 | } | |
2172 | ||
88219a0f | 2173 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2174 | { |
2175 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2176 | u16 dcid, flags; | |
2177 | u8 rsp[64]; | |
2178 | struct sock *sk; | |
5dee9e7c | 2179 | int len; |
1da177e4 LT |
2180 | |
2181 | dcid = __le16_to_cpu(req->dcid); | |
2182 | flags = __le16_to_cpu(req->flags); | |
2183 | ||
2184 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2185 | ||
af05b30b GP |
2186 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2187 | if (!sk) | |
1da177e4 LT |
2188 | return -ENOENT; |
2189 | ||
df6bd743 GP |
2190 | if (sk->sk_state != BT_CONFIG) { |
2191 | struct l2cap_cmd_rej rej; | |
2192 | ||
2193 | rej.reason = cpu_to_le16(0x0002); | |
2194 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2195 | sizeof(rej), &rej); | |
354f60a9 | 2196 | goto unlock; |
df6bd743 | 2197 | } |
354f60a9 | 2198 | |
5dee9e7c | 2199 | /* Reject if config buffer is too small. */ |
88219a0f | 2200 | len = cmd_len - sizeof(*req); |
5dee9e7c MH |
2201 | if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { |
2202 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
2203 | l2cap_build_conf_rsp(sk, rsp, | |
2204 | L2CAP_CONF_REJECT, flags), rsp); | |
2205 | goto unlock; | |
2206 | } | |
2207 | ||
2208 | /* Store config. */ | |
2209 | memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); | |
2210 | l2cap_pi(sk)->conf_len += len; | |
1da177e4 LT |
2211 | |
2212 | if (flags & 0x0001) { | |
2213 | /* Incomplete config. Send empty response. */ | |
2214 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2215 | l2cap_build_conf_rsp(sk, rsp, |
2216 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2217 | goto unlock; |
2218 | } | |
2219 | ||
2220 | /* Complete config. */ | |
5dee9e7c | 2221 | len = l2cap_parse_conf_req(sk, rsp); |
f2fcfcd6 | 2222 | if (len < 0) { |
9b108fc0 | 2223 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 | 2224 | goto unlock; |
f2fcfcd6 | 2225 | } |
1da177e4 | 2226 | |
5dee9e7c | 2227 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
f2fcfcd6 | 2228 | l2cap_pi(sk)->num_conf_rsp++; |
5dee9e7c | 2229 | |
5dee9e7c MH |
2230 | /* Reset config buffer. */ |
2231 | l2cap_pi(sk)->conf_len = 0; | |
2232 | ||
876d9484 MH |
2233 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
2234 | goto unlock; | |
2235 | ||
1da177e4 | 2236 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { |
8c462b60 | 2237 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2238 | |
1da177e4 | 2239 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2240 | |
0565c1c2 GP |
2241 | l2cap_pi(sk)->next_tx_seq = 0; |
2242 | l2cap_pi(sk)->expected_tx_seq = 0; | |
1c2acffb | 2243 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2244 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2245 | l2cap_ertm_init(sk); | |
2246 | ||
1da177e4 | 2247 | l2cap_chan_ready(sk); |
876d9484 MH |
2248 | goto unlock; |
2249 | } | |
2250 | ||
2251 | if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { | |
79d554a6 | 2252 | u8 buf[64]; |
ab3e5715 | 2253 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2254 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
79d554a6 | 2255 | l2cap_build_conf_req(sk, buf), buf); |
f2fcfcd6 | 2256 | l2cap_pi(sk)->num_conf_req++; |
1da177e4 LT |
2257 | } |
2258 | ||
2259 | unlock: | |
2260 | bh_unlock_sock(sk); | |
2261 | return 0; | |
2262 | } | |
2263 | ||
2264 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2265 | { | |
2266 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2267 | u16 scid, flags, result; | |
2268 | struct sock *sk; | |
7b1c0049 | 2269 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2270 | |
2271 | scid = __le16_to_cpu(rsp->scid); | |
2272 | flags = __le16_to_cpu(rsp->flags); | |
2273 | result = __le16_to_cpu(rsp->result); | |
2274 | ||
af05b30b GP |
2275 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2276 | scid, flags, result); | |
1da177e4 | 2277 | |
af05b30b GP |
2278 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2279 | if (!sk) | |
1da177e4 LT |
2280 | return 0; |
2281 | ||
2282 | switch (result) { | |
2283 | case L2CAP_CONF_SUCCESS: | |
7b1c0049 | 2284 | l2cap_conf_rfc_get(sk, rsp->data, len); |
1da177e4 LT |
2285 | break; |
2286 | ||
2287 | case L2CAP_CONF_UNACCEPT: | |
f2fcfcd6 | 2288 | if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2289 | char req[64]; |
2290 | ||
c2c77ec8 | 2291 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
9b108fc0 | 2292 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
c2c77ec8 AE |
2293 | goto done; |
2294 | } | |
2295 | ||
f2fcfcd6 GP |
2296 | /* throw out any old stored conf requests */ |
2297 | result = L2CAP_CONF_SUCCESS; | |
2298 | len = l2cap_parse_conf_rsp(sk, rsp->data, | |
2299 | len, req, &result); | |
2300 | if (len < 0) { | |
9b108fc0 | 2301 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
f2fcfcd6 GP |
2302 | goto done; |
2303 | } | |
2304 | ||
2305 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2306 | L2CAP_CONF_REQ, len, req); | |
2307 | l2cap_pi(sk)->num_conf_req++; | |
2308 | if (result != L2CAP_CONF_SUCCESS) | |
2309 | goto done; | |
2310 | break; | |
1da177e4 LT |
2311 | } |
2312 | ||
8e87d142 | 2313 | default: |
b1235d79 | 2314 | sk->sk_err = ECONNRESET; |
1da177e4 | 2315 | l2cap_sock_set_timer(sk, HZ * 5); |
9b108fc0 | 2316 | l2cap_send_disconn_req(conn, sk, ECONNRESET); |
1da177e4 LT |
2317 | goto done; |
2318 | } | |
2319 | ||
2320 | if (flags & 0x01) | |
2321 | goto done; | |
2322 | ||
1da177e4 LT |
2323 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; |
2324 | ||
2325 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { | |
8c462b60 | 2326 | set_default_fcs(l2cap_pi(sk)); |
fcc203c3 | 2327 | |
1da177e4 | 2328 | sk->sk_state = BT_CONNECTED; |
0565c1c2 | 2329 | l2cap_pi(sk)->next_tx_seq = 0; |
1c2acffb | 2330 | l2cap_pi(sk)->expected_tx_seq = 0; |
1c2acffb | 2331 | __skb_queue_head_init(TX_QUEUE(sk)); |
0565c1c2 GP |
2332 | if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) |
2333 | l2cap_ertm_init(sk); | |
2334 | ||
1da177e4 LT |
2335 | l2cap_chan_ready(sk); |
2336 | } | |
2337 | ||
2338 | done: | |
2339 | bh_unlock_sock(sk); | |
2340 | return 0; | |
2341 | } | |
2342 | ||
2343 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2344 | { | |
2345 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2346 | struct l2cap_disconn_rsp rsp; | |
2347 | u16 dcid, scid; | |
2348 | struct sock *sk; | |
2349 | ||
2350 | scid = __le16_to_cpu(req->scid); | |
2351 | dcid = __le16_to_cpu(req->dcid); | |
2352 | ||
2353 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2354 | ||
af05b30b GP |
2355 | sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); |
2356 | if (!sk) | |
1da177e4 LT |
2357 | return 0; |
2358 | ||
aca3192c YH |
2359 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2360 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
2361 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2362 | ||
2363 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2364 | ||
a49184c2 AE |
2365 | /* don't delete l2cap channel if sk is owned by user */ |
2366 | if (sock_owned_by_user(sk)) { | |
2367 | sk->sk_state = BT_DISCONN; | |
2368 | l2cap_sock_clear_timer(sk); | |
2369 | l2cap_sock_set_timer(sk, HZ / 5); | |
2370 | bh_unlock_sock(sk); | |
2371 | return 0; | |
2372 | } | |
2373 | ||
1da177e4 LT |
2374 | l2cap_chan_del(sk, ECONNRESET); |
2375 | bh_unlock_sock(sk); | |
2376 | ||
2377 | l2cap_sock_kill(sk); | |
2378 | return 0; | |
2379 | } | |
2380 | ||
2381 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2382 | { | |
2383 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2384 | u16 dcid, scid; | |
2385 | struct sock *sk; | |
2386 | ||
2387 | scid = __le16_to_cpu(rsp->scid); | |
2388 | dcid = __le16_to_cpu(rsp->dcid); | |
2389 | ||
2390 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2391 | ||
af05b30b GP |
2392 | sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); |
2393 | if (!sk) | |
1da177e4 LT |
2394 | return 0; |
2395 | ||
a49184c2 AE |
2396 | /* don't delete l2cap channel if sk is owned by user */ |
2397 | if (sock_owned_by_user(sk)) { | |
2398 | sk->sk_state = BT_DISCONN; | |
2399 | l2cap_sock_clear_timer(sk); | |
2400 | l2cap_sock_set_timer(sk, HZ / 5); | |
2401 | bh_unlock_sock(sk); | |
2402 | return 0; | |
2403 | } | |
2404 | ||
1da177e4 LT |
2405 | l2cap_chan_del(sk, 0); |
2406 | bh_unlock_sock(sk); | |
2407 | ||
2408 | l2cap_sock_kill(sk); | |
2409 | return 0; | |
2410 | } | |
2411 | ||
2412 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2413 | { | |
2414 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2415 | u16 type; |
2416 | ||
2417 | type = __le16_to_cpu(req->type); | |
2418 | ||
2419 | BT_DBG("type 0x%4.4x", type); | |
2420 | ||
f0709e03 MH |
2421 | if (type == L2CAP_IT_FEAT_MASK) { |
2422 | u8 buf[8]; | |
44dd46de | 2423 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2424 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2425 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2426 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2427 | if (!disable_ertm) |
fcc203c3 GP |
2428 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2429 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2430 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2431 | l2cap_send_cmd(conn, cmd->ident, |
2432 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2433 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2434 | u8 buf[12]; | |
2435 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2436 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2437 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2438 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2439 | l2cap_send_cmd(conn, cmd->ident, | |
2440 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2441 | } else { |
2442 | struct l2cap_info_rsp rsp; | |
2443 | rsp.type = cpu_to_le16(type); | |
2444 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2445 | l2cap_send_cmd(conn, cmd->ident, | |
2446 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2447 | } | |
1da177e4 LT |
2448 | |
2449 | return 0; | |
2450 | } | |
2451 | ||
2452 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2453 | { | |
2454 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2455 | u16 type, result; | |
2456 | ||
2457 | type = __le16_to_cpu(rsp->type); | |
2458 | result = __le16_to_cpu(rsp->result); | |
2459 | ||
2460 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2461 | ||
4e8402a3 MH |
2462 | del_timer(&conn->info_timer); |
2463 | ||
adb08ede VT |
2464 | if (result != L2CAP_IR_SUCCESS) { |
2465 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2466 | conn->info_ident = 0; | |
2467 | ||
2468 | l2cap_conn_start(conn); | |
2469 | ||
2470 | return 0; | |
2471 | } | |
2472 | ||
984947dc | 2473 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2474 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2475 | |
47ec1dcd | 2476 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2477 | struct l2cap_info_req req; |
2478 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2479 | ||
2480 | conn->info_ident = l2cap_get_ident(conn); | |
2481 | ||
2482 | l2cap_send_cmd(conn, conn->info_ident, | |
2483 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2484 | } else { | |
2485 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2486 | conn->info_ident = 0; | |
2487 | ||
2488 | l2cap_conn_start(conn); | |
2489 | } | |
2490 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2491 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2492 | conn->info_ident = 0; |
984947dc MH |
2493 | |
2494 | l2cap_conn_start(conn); | |
2495 | } | |
4e8402a3 | 2496 | |
1da177e4 LT |
2497 | return 0; |
2498 | } | |
2499 | ||
e2174ca4 | 2500 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2501 | u16 to_multiplier) |
2502 | { | |
2503 | u16 max_latency; | |
2504 | ||
2505 | if (min > max || min < 6 || max > 3200) | |
2506 | return -EINVAL; | |
2507 | ||
2508 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2509 | return -EINVAL; | |
2510 | ||
2511 | if (max >= to_multiplier * 8) | |
2512 | return -EINVAL; | |
2513 | ||
2514 | max_latency = (to_multiplier * 8 / max) - 1; | |
2515 | if (latency > 499 || latency > max_latency) | |
2516 | return -EINVAL; | |
2517 | ||
2518 | return 0; | |
2519 | } | |
2520 | ||
2521 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2522 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2523 | { | |
2524 | struct hci_conn *hcon = conn->hcon; | |
2525 | struct l2cap_conn_param_update_req *req; | |
2526 | struct l2cap_conn_param_update_rsp rsp; | |
2527 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2528 | int err; |
de73115a CT |
2529 | |
2530 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2531 | return -EINVAL; | |
2532 | ||
2533 | cmd_len = __le16_to_cpu(cmd->len); | |
2534 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2535 | return -EPROTO; | |
2536 | ||
2537 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2538 | min = __le16_to_cpu(req->min); |
2539 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2540 | latency = __le16_to_cpu(req->latency); |
2541 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2542 | ||
2543 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2544 | min, max, latency, to_multiplier); | |
2545 | ||
2546 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2547 | |
2548 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2549 | if (err) | |
de73115a CT |
2550 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2551 | else | |
2552 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2553 | ||
2554 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2555 | sizeof(rsp), &rsp); | |
2556 | ||
2ce603eb CT |
2557 | if (!err) |
2558 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2559 | ||
de73115a CT |
2560 | return 0; |
2561 | } | |
2562 | ||
3300d9a9 CT |
2563 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2564 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2565 | { | |
2566 | int err = 0; | |
2567 | ||
2568 | switch (cmd->code) { | |
2569 | case L2CAP_COMMAND_REJ: | |
2570 | l2cap_command_rej(conn, cmd, data); | |
2571 | break; | |
2572 | ||
2573 | case L2CAP_CONN_REQ: | |
2574 | err = l2cap_connect_req(conn, cmd, data); | |
2575 | break; | |
2576 | ||
2577 | case L2CAP_CONN_RSP: | |
2578 | err = l2cap_connect_rsp(conn, cmd, data); | |
2579 | break; | |
2580 | ||
2581 | case L2CAP_CONF_REQ: | |
2582 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2583 | break; | |
2584 | ||
2585 | case L2CAP_CONF_RSP: | |
2586 | err = l2cap_config_rsp(conn, cmd, data); | |
2587 | break; | |
2588 | ||
2589 | case L2CAP_DISCONN_REQ: | |
2590 | err = l2cap_disconnect_req(conn, cmd, data); | |
2591 | break; | |
2592 | ||
2593 | case L2CAP_DISCONN_RSP: | |
2594 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2595 | break; | |
2596 | ||
2597 | case L2CAP_ECHO_REQ: | |
2598 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2599 | break; | |
2600 | ||
2601 | case L2CAP_ECHO_RSP: | |
2602 | break; | |
2603 | ||
2604 | case L2CAP_INFO_REQ: | |
2605 | err = l2cap_information_req(conn, cmd, data); | |
2606 | break; | |
2607 | ||
2608 | case L2CAP_INFO_RSP: | |
2609 | err = l2cap_information_rsp(conn, cmd, data); | |
2610 | break; | |
2611 | ||
2612 | default: | |
2613 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2614 | err = -EINVAL; | |
2615 | break; | |
2616 | } | |
2617 | ||
2618 | return err; | |
2619 | } | |
2620 | ||
2621 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2622 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2623 | { | |
2624 | switch (cmd->code) { | |
2625 | case L2CAP_COMMAND_REJ: | |
2626 | return 0; | |
2627 | ||
2628 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2629 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2630 | |
2631 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2632 | return 0; | |
2633 | ||
2634 | default: | |
2635 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2636 | return -EINVAL; | |
2637 | } | |
2638 | } | |
2639 | ||
2640 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2641 | struct sk_buff *skb) | |
1da177e4 LT |
2642 | { |
2643 | u8 *data = skb->data; | |
2644 | int len = skb->len; | |
2645 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2646 | int err; |
1da177e4 LT |
2647 | |
2648 | l2cap_raw_recv(conn, skb); | |
2649 | ||
2650 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2651 | u16 cmd_len; |
1da177e4 LT |
2652 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2653 | data += L2CAP_CMD_HDR_SIZE; | |
2654 | len -= L2CAP_CMD_HDR_SIZE; | |
2655 | ||
88219a0f | 2656 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2657 | |
88219a0f | 2658 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2659 | |
88219a0f | 2660 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2661 | BT_DBG("corrupted command"); |
2662 | break; | |
2663 | } | |
2664 | ||
3300d9a9 CT |
2665 | if (conn->hcon->type == LE_LINK) |
2666 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
2667 | else | |
2668 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
2669 | |
2670 | if (err) { | |
2671 | struct l2cap_cmd_rej rej; | |
2672 | BT_DBG("error %d", err); | |
2673 | ||
2674 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2675 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2676 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2677 | } | |
2678 | ||
88219a0f AV |
2679 | data += cmd_len; |
2680 | len -= cmd_len; | |
1da177e4 LT |
2681 | } |
2682 | ||
2683 | kfree_skb(skb); | |
2684 | } | |
2685 | ||
fcc203c3 GP |
2686 | static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) |
2687 | { | |
2688 | u16 our_fcs, rcv_fcs; | |
2689 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
2690 | ||
2691 | if (pi->fcs == L2CAP_FCS_CRC16) { | |
2692 | skb_trim(skb, skb->len - 2); | |
2693 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
2694 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
2695 | ||
2696 | if (our_fcs != rcv_fcs) | |
7a560e5c | 2697 | return -EBADMSG; |
fcc203c3 GP |
2698 | } |
2699 | return 0; | |
2700 | } | |
2701 | ||
d5392c8f GP |
2702 | static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) |
2703 | { | |
2704 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2705 | u16 control = 0; | |
2706 | ||
2707 | pi->frames_sent = 0; | |
d5392c8f GP |
2708 | |
2709 | control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2710 | ||
2711 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
64988868 | 2712 | control |= L2CAP_SUPER_RCV_NOT_READY; |
d5392c8f | 2713 | l2cap_send_sframe(pi, control); |
1890d36b | 2714 | pi->conn_state |= L2CAP_CONN_RNR_SENT; |
d5392c8f GP |
2715 | } |
2716 | ||
4ea727ef GP |
2717 | if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) |
2718 | l2cap_retransmit_frames(sk); | |
d5392c8f GP |
2719 | |
2720 | l2cap_ertm_send(sk); | |
2721 | ||
2722 | if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && | |
2723 | pi->frames_sent == 0) { | |
2724 | control |= L2CAP_SUPER_RCV_READY; | |
d5392c8f GP |
2725 | l2cap_send_sframe(pi, control); |
2726 | } | |
2727 | } | |
2728 | ||
9b53350d | 2729 | static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
2730 | { |
2731 | struct sk_buff *next_skb; | |
bfbacc11 JPRV |
2732 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
2733 | int tx_seq_offset, next_tx_seq_offset; | |
8f17154f GP |
2734 | |
2735 | bt_cb(skb)->tx_seq = tx_seq; | |
2736 | bt_cb(skb)->sar = sar; | |
2737 | ||
2738 | next_skb = skb_peek(SREJ_QUEUE(sk)); | |
2739 | if (!next_skb) { | |
2740 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d | 2741 | return 0; |
8f17154f GP |
2742 | } |
2743 | ||
bfbacc11 JPRV |
2744 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
2745 | if (tx_seq_offset < 0) | |
2746 | tx_seq_offset += 64; | |
2747 | ||
8f17154f | 2748 | do { |
9b53350d JPRV |
2749 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
2750 | return -EINVAL; | |
2751 | ||
bfbacc11 JPRV |
2752 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
2753 | pi->buffer_seq) % 64; | |
2754 | if (next_tx_seq_offset < 0) | |
2755 | next_tx_seq_offset += 64; | |
2756 | ||
2757 | if (next_tx_seq_offset > tx_seq_offset) { | |
8f17154f | 2758 | __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); |
9b53350d | 2759 | return 0; |
8f17154f GP |
2760 | } |
2761 | ||
2762 | if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) | |
2763 | break; | |
2764 | ||
59203a21 | 2765 | } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); |
8f17154f GP |
2766 | |
2767 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
9b53350d JPRV |
2768 | |
2769 | return 0; | |
8f17154f GP |
2770 | } |
2771 | ||
18778a63 GP |
2772 | static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
2773 | { | |
2774 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2775 | struct sk_buff *_skb; | |
1890d36b | 2776 | int err; |
18778a63 GP |
2777 | |
2778 | switch (control & L2CAP_CTRL_SAR) { | |
2779 | case L2CAP_SDU_UNSEGMENTED: | |
2780 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
2781 | goto drop; | |
2782 | ||
2783 | err = sock_queue_rcv_skb(sk, skb); | |
2784 | if (!err) | |
2785 | return err; | |
2786 | ||
2787 | break; | |
2788 | ||
2789 | case L2CAP_SDU_START: | |
2790 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) | |
2791 | goto drop; | |
2792 | ||
2793 | pi->sdu_len = get_unaligned_le16(skb->data); | |
18778a63 GP |
2794 | |
2795 | if (pi->sdu_len > pi->imtu) | |
2796 | goto disconnect; | |
2797 | ||
2798 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); | |
1890d36b GP |
2799 | if (!pi->sdu) |
2800 | return -ENOMEM; | |
2801 | ||
2802 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
2803 | * condition we have to be sure that this will be executed | |
2804 | * only once, i.e., when alloc does not fail */ | |
2805 | skb_pull(skb, 2); | |
18778a63 GP |
2806 | |
2807 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
2808 | ||
2809 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
2810 | pi->partial_sdu_len = skb->len; | |
2811 | break; | |
2812 | ||
2813 | case L2CAP_SDU_CONTINUE: | |
2814 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
2815 | goto disconnect; | |
2816 | ||
2817 | if (!pi->sdu) | |
2818 | goto disconnect; | |
2819 | ||
18778a63 GP |
2820 | pi->partial_sdu_len += skb->len; |
2821 | if (pi->partial_sdu_len > pi->sdu_len) | |
2822 | goto drop; | |
2823 | ||
4178ba46 GP |
2824 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); |
2825 | ||
18778a63 GP |
2826 | break; |
2827 | ||
2828 | case L2CAP_SDU_END: | |
2829 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
2830 | goto disconnect; | |
2831 | ||
2832 | if (!pi->sdu) | |
2833 | goto disconnect; | |
2834 | ||
1890d36b | 2835 | if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { |
1890d36b | 2836 | pi->partial_sdu_len += skb->len; |
18778a63 | 2837 | |
1890d36b GP |
2838 | if (pi->partial_sdu_len > pi->imtu) |
2839 | goto drop; | |
18778a63 | 2840 | |
1890d36b GP |
2841 | if (pi->partial_sdu_len != pi->sdu_len) |
2842 | goto drop; | |
4178ba46 GP |
2843 | |
2844 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
1890d36b | 2845 | } |
18778a63 GP |
2846 | |
2847 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
1890d36b GP |
2848 | if (!_skb) { |
2849 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; | |
2850 | return -ENOMEM; | |
2851 | } | |
2852 | ||
18778a63 | 2853 | err = sock_queue_rcv_skb(sk, _skb); |
1890d36b | 2854 | if (err < 0) { |
18778a63 | 2855 | kfree_skb(_skb); |
1890d36b GP |
2856 | pi->conn_state |= L2CAP_CONN_SAR_RETRY; |
2857 | return err; | |
2858 | } | |
2859 | ||
2860 | pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; | |
2861 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 GP |
2862 | |
2863 | kfree_skb(pi->sdu); | |
2864 | break; | |
2865 | } | |
2866 | ||
2867 | kfree_skb(skb); | |
1890d36b | 2868 | return 0; |
18778a63 GP |
2869 | |
2870 | drop: | |
2871 | kfree_skb(pi->sdu); | |
2872 | pi->sdu = NULL; | |
2873 | ||
2874 | disconnect: | |
9b108fc0 | 2875 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
18778a63 GP |
2876 | kfree_skb(skb); |
2877 | return 0; | |
2878 | } | |
2879 | ||
712132eb GP |
2880 | static int l2cap_try_push_rx_skb(struct sock *sk) |
2881 | { | |
2882 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2883 | struct sk_buff *skb; | |
2884 | u16 control; | |
2885 | int err; | |
2886 | ||
2887 | while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { | |
2888 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; | |
2889 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
2890 | if (err < 0) { | |
2891 | skb_queue_head(BUSY_QUEUE(sk), skb); | |
2892 | return -EBUSY; | |
2893 | } | |
2894 | ||
2895 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
2896 | } | |
2897 | ||
2898 | if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) | |
2899 | goto done; | |
2900 | ||
2901 | control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2902 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; | |
2903 | l2cap_send_sframe(pi, control); | |
2904 | l2cap_pi(sk)->retry_count = 1; | |
2905 | ||
2906 | del_timer(&pi->retrans_timer); | |
2907 | __mod_monitor_timer(); | |
2908 | ||
2909 | l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; | |
2910 | ||
2911 | done: | |
2912 | pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; | |
2913 | pi->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
2914 | ||
2915 | BT_DBG("sk %p, Exit local busy", sk); | |
2916 | ||
2917 | return 0; | |
2918 | } | |
2919 | ||
1890d36b GP |
2920 | static void l2cap_busy_work(struct work_struct *work) |
2921 | { | |
2922 | DECLARE_WAITQUEUE(wait, current); | |
2923 | struct l2cap_pinfo *pi = | |
2924 | container_of(work, struct l2cap_pinfo, busy_work); | |
2925 | struct sock *sk = (struct sock *)pi; | |
2926 | int n_tries = 0, timeo = HZ/5, err; | |
2927 | struct sk_buff *skb; | |
1890d36b GP |
2928 | |
2929 | lock_sock(sk); | |
2930 | ||
2b0b05dd | 2931 | add_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
2932 | while ((skb = skb_peek(BUSY_QUEUE(sk)))) { |
2933 | set_current_state(TASK_INTERRUPTIBLE); | |
2934 | ||
2935 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
2936 | err = -EBUSY; | |
9b108fc0 | 2937 | l2cap_send_disconn_req(pi->conn, sk, EBUSY); |
712132eb | 2938 | break; |
1890d36b GP |
2939 | } |
2940 | ||
2941 | if (!timeo) | |
2942 | timeo = HZ/5; | |
2943 | ||
2944 | if (signal_pending(current)) { | |
2945 | err = sock_intr_errno(timeo); | |
712132eb | 2946 | break; |
1890d36b GP |
2947 | } |
2948 | ||
2949 | release_sock(sk); | |
2950 | timeo = schedule_timeout(timeo); | |
2951 | lock_sock(sk); | |
2952 | ||
2953 | err = sock_error(sk); | |
2954 | if (err) | |
712132eb | 2955 | break; |
1890d36b | 2956 | |
712132eb | 2957 | if (l2cap_try_push_rx_skb(sk) == 0) |
1890d36b GP |
2958 | break; |
2959 | } | |
2960 | ||
1890d36b | 2961 | set_current_state(TASK_RUNNING); |
2b0b05dd | 2962 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
2963 | |
2964 | release_sock(sk); | |
2965 | } | |
2966 | ||
2967 | static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) | |
2968 | { | |
2969 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
2970 | int sctrl, err; | |
2971 | ||
2972 | if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { | |
2973 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
2974 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
712132eb GP |
2975 | return l2cap_try_push_rx_skb(sk); |
2976 | ||
2977 | ||
1890d36b GP |
2978 | } |
2979 | ||
2980 | err = l2cap_ertm_reassembly_sdu(sk, skb, control); | |
2981 | if (err >= 0) { | |
2982 | pi->buffer_seq = (pi->buffer_seq + 1) % 64; | |
2983 | return err; | |
2984 | } | |
2985 | ||
2986 | /* Busy Condition */ | |
0e98958d GP |
2987 | BT_DBG("sk %p, Enter local busy", sk); |
2988 | ||
1890d36b GP |
2989 | pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
2990 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; | |
2991 | __skb_queue_tail(BUSY_QUEUE(sk), skb); | |
2992 | ||
2993 | sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
2994 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; | |
2995 | l2cap_send_sframe(pi, sctrl); | |
2996 | ||
2997 | pi->conn_state |= L2CAP_CONN_RNR_SENT; | |
2998 | ||
7fe9b298 GP |
2999 | del_timer(&pi->ack_timer); |
3000 | ||
1890d36b GP |
3001 | queue_work(_busy_wq, &pi->busy_work); |
3002 | ||
3003 | return err; | |
3004 | } | |
3005 | ||
18778a63 | 3006 | static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) |
c74e560c GP |
3007 | { |
3008 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3009 | struct sk_buff *_skb; | |
3010 | int err = -EINVAL; | |
3011 | ||
18778a63 GP |
3012 | /* |
3013 | * TODO: We have to notify the userland if some data is lost with the | |
3014 | * Streaming Mode. | |
3015 | */ | |
3016 | ||
c74e560c GP |
3017 | switch (control & L2CAP_CTRL_SAR) { |
3018 | case L2CAP_SDU_UNSEGMENTED: | |
3019 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3020 | kfree_skb(pi->sdu); | |
3021 | break; | |
3022 | } | |
3023 | ||
3024 | err = sock_queue_rcv_skb(sk, skb); | |
3025 | if (!err) | |
3026 | return 0; | |
3027 | ||
3028 | break; | |
3029 | ||
3030 | case L2CAP_SDU_START: | |
3031 | if (pi->conn_state & L2CAP_CONN_SAR_SDU) { | |
3032 | kfree_skb(pi->sdu); | |
3033 | break; | |
3034 | } | |
3035 | ||
3036 | pi->sdu_len = get_unaligned_le16(skb->data); | |
3037 | skb_pull(skb, 2); | |
3038 | ||
052897ca GP |
3039 | if (pi->sdu_len > pi->imtu) { |
3040 | err = -EMSGSIZE; | |
3041 | break; | |
3042 | } | |
3043 | ||
c74e560c GP |
3044 | pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); |
3045 | if (!pi->sdu) { | |
3046 | err = -ENOMEM; | |
3047 | break; | |
3048 | } | |
3049 | ||
3050 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3051 | ||
3052 | pi->conn_state |= L2CAP_CONN_SAR_SDU; | |
3053 | pi->partial_sdu_len = skb->len; | |
3054 | err = 0; | |
3055 | break; | |
3056 | ||
3057 | case L2CAP_SDU_CONTINUE: | |
3058 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3059 | break; | |
3060 | ||
3061 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3062 | ||
3063 | pi->partial_sdu_len += skb->len; | |
3064 | if (pi->partial_sdu_len > pi->sdu_len) | |
3065 | kfree_skb(pi->sdu); | |
3066 | else | |
3067 | err = 0; | |
3068 | ||
3069 | break; | |
3070 | ||
3071 | case L2CAP_SDU_END: | |
3072 | if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) | |
3073 | break; | |
3074 | ||
3075 | memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); | |
3076 | ||
3077 | pi->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
3078 | pi->partial_sdu_len += skb->len; | |
3079 | ||
36f2fd58 GP |
3080 | if (pi->partial_sdu_len > pi->imtu) |
3081 | goto drop; | |
3082 | ||
c74e560c GP |
3083 | if (pi->partial_sdu_len == pi->sdu_len) { |
3084 | _skb = skb_clone(pi->sdu, GFP_ATOMIC); | |
3085 | err = sock_queue_rcv_skb(sk, _skb); | |
3086 | if (err < 0) | |
3087 | kfree_skb(_skb); | |
3088 | } | |
c74e560c GP |
3089 | err = 0; |
3090 | ||
36f2fd58 GP |
3091 | drop: |
3092 | kfree_skb(pi->sdu); | |
c74e560c GP |
3093 | break; |
3094 | } | |
3095 | ||
3096 | kfree_skb(skb); | |
3097 | return err; | |
3098 | } | |
3099 | ||
8f17154f GP |
3100 | static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) |
3101 | { | |
3102 | struct sk_buff *skb; | |
afefdbc4 | 3103 | u16 control; |
8f17154f | 3104 | |
59203a21 | 3105 | while ((skb = skb_peek(SREJ_QUEUE(sk)))) { |
8f17154f GP |
3106 | if (bt_cb(skb)->tx_seq != tx_seq) |
3107 | break; | |
3108 | ||
3109 | skb = skb_dequeue(SREJ_QUEUE(sk)); | |
afefdbc4 | 3110 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
18778a63 | 3111 | l2cap_ertm_reassembly_sdu(sk, skb, control); |
8f17154f GP |
3112 | l2cap_pi(sk)->buffer_seq_srej = |
3113 | (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3114 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3115 | } |
3116 | } | |
3117 | ||
3118 | static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) | |
3119 | { | |
3120 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3121 | struct srej_list *l, *tmp; | |
3122 | u16 control; | |
3123 | ||
59203a21 | 3124 | list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { |
8f17154f GP |
3125 | if (l->tx_seq == tx_seq) { |
3126 | list_del(&l->list); | |
3127 | kfree(l); | |
3128 | return; | |
3129 | } | |
3130 | control = L2CAP_SUPER_SELECT_REJECT; | |
3131 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3132 | l2cap_send_sframe(pi, control); | |
3133 | list_del(&l->list); | |
3134 | list_add_tail(&l->list, SREJ_LIST(sk)); | |
3135 | } | |
3136 | } | |
3137 | ||
3138 | static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) | |
3139 | { | |
3140 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3141 | struct srej_list *new; | |
3142 | u16 control; | |
3143 | ||
3144 | while (tx_seq != pi->expected_tx_seq) { | |
3145 | control = L2CAP_SUPER_SELECT_REJECT; | |
3146 | control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
3147 | l2cap_send_sframe(pi, control); | |
3148 | ||
3149 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
8ff50ec0 GP |
3150 | new->tx_seq = pi->expected_tx_seq; |
3151 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
8f17154f GP |
3152 | list_add_tail(&new->list, SREJ_LIST(sk)); |
3153 | } | |
8ff50ec0 | 3154 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; |
8f17154f GP |
3155 | } |
3156 | ||
1c2acffb GP |
3157 | static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) |
3158 | { | |
3159 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3160 | u8 tx_seq = __get_txseq(rx_control); | |
9f121a5a | 3161 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3162 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3163 | int tx_seq_offset, expected_tx_seq_offset; |
803020c6 | 3164 | int num_to_ack = (pi->tx_win/6) + 1; |
1c2acffb GP |
3165 | int err = 0; |
3166 | ||
0e98958d GP |
3167 | BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, |
3168 | rx_control); | |
1c2acffb | 3169 | |
9b16dc65 GP |
3170 | if (L2CAP_CTRL_FINAL & rx_control && |
3171 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
1d8f5d16 GP |
3172 | del_timer(&pi->monitor_timer); |
3173 | if (pi->unacked_frames > 0) | |
3174 | __mod_retrans_timer(); | |
3175 | pi->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3176 | } | |
3177 | ||
9f121a5a GP |
3178 | pi->expected_ack_seq = req_seq; |
3179 | l2cap_drop_acked_frames(sk); | |
3180 | ||
8f17154f GP |
3181 | if (tx_seq == pi->expected_tx_seq) |
3182 | goto expected; | |
1c2acffb | 3183 | |
9b53350d JPRV |
3184 | tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; |
3185 | if (tx_seq_offset < 0) | |
3186 | tx_seq_offset += 64; | |
3187 | ||
3188 | /* invalid tx_seq */ | |
3189 | if (tx_seq_offset >= pi->tx_win) { | |
9b108fc0 | 3190 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); |
9b53350d JPRV |
3191 | goto drop; |
3192 | } | |
3193 | ||
1890d36b GP |
3194 | if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) |
3195 | goto drop; | |
3196 | ||
8f17154f GP |
3197 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3198 | struct srej_list *first; | |
30afb5b2 | 3199 | |
8f17154f GP |
3200 | first = list_first_entry(SREJ_LIST(sk), |
3201 | struct srej_list, list); | |
3202 | if (tx_seq == first->tx_seq) { | |
3203 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); | |
3204 | l2cap_check_srej_gap(sk, tx_seq); | |
3205 | ||
3206 | list_del(&first->list); | |
3207 | kfree(first); | |
3208 | ||
3209 | if (list_empty(SREJ_LIST(sk))) { | |
3210 | pi->buffer_seq = pi->buffer_seq_srej; | |
3211 | pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; | |
855666cc | 3212 | l2cap_send_ack(pi); |
0e98958d | 3213 | BT_DBG("sk %p, Exit SREJ_SENT", sk); |
8f17154f GP |
3214 | } |
3215 | } else { | |
3216 | struct srej_list *l; | |
9b53350d JPRV |
3217 | |
3218 | /* duplicated tx_seq */ | |
3219 | if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) | |
3220 | goto drop; | |
8f17154f GP |
3221 | |
3222 | list_for_each_entry(l, SREJ_LIST(sk), list) { | |
3223 | if (l->tx_seq == tx_seq) { | |
3224 | l2cap_resend_srejframe(sk, tx_seq); | |
3225 | return 0; | |
3226 | } | |
3227 | } | |
3228 | l2cap_send_srejframe(sk, tx_seq); | |
30afb5b2 GP |
3229 | } |
3230 | } else { | |
9b53350d JPRV |
3231 | expected_tx_seq_offset = |
3232 | (pi->expected_tx_seq - pi->buffer_seq) % 64; | |
3233 | if (expected_tx_seq_offset < 0) | |
3234 | expected_tx_seq_offset += 64; | |
3235 | ||
3236 | /* duplicated tx_seq */ | |
3237 | if (tx_seq_offset < expected_tx_seq_offset) | |
3238 | goto drop; | |
3239 | ||
8f17154f | 3240 | pi->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3241 | |
0e98958d GP |
3242 | BT_DBG("sk %p, Enter SREJ", sk); |
3243 | ||
8f17154f GP |
3244 | INIT_LIST_HEAD(SREJ_LIST(sk)); |
3245 | pi->buffer_seq_srej = pi->buffer_seq; | |
3246 | ||
3247 | __skb_queue_head_init(SREJ_QUEUE(sk)); | |
1890d36b | 3248 | __skb_queue_head_init(BUSY_QUEUE(sk)); |
8f17154f GP |
3249 | l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); |
3250 | ||
ef54fd93 GP |
3251 | pi->conn_state |= L2CAP_CONN_SEND_PBIT; |
3252 | ||
8f17154f | 3253 | l2cap_send_srejframe(sk, tx_seq); |
7fe9b298 GP |
3254 | |
3255 | del_timer(&pi->ack_timer); | |
1c2acffb | 3256 | } |
30afb5b2 GP |
3257 | return 0; |
3258 | ||
8f17154f GP |
3259 | expected: |
3260 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3261 | ||
3262 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3b1a9f3f GP |
3263 | bt_cb(skb)->tx_seq = tx_seq; |
3264 | bt_cb(skb)->sar = sar; | |
3265 | __skb_queue_tail(SREJ_QUEUE(sk), skb); | |
8f17154f GP |
3266 | return 0; |
3267 | } | |
3268 | ||
2ece3684 GP |
3269 | err = l2cap_push_rx_skb(sk, skb, rx_control); |
3270 | if (err < 0) | |
3271 | return 0; | |
3272 | ||
4ec10d97 GP |
3273 | if (rx_control & L2CAP_CTRL_FINAL) { |
3274 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3275 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3276 | else |
3277 | l2cap_retransmit_frames(sk); | |
4ec10d97 GP |
3278 | } |
3279 | ||
c1b4f43b GP |
3280 | __mod_ack_timer(); |
3281 | ||
803020c6 GP |
3282 | pi->num_acked = (pi->num_acked + 1) % num_to_ack; |
3283 | if (pi->num_acked == num_to_ack - 1) | |
9e917af1 GP |
3284 | l2cap_send_ack(pi); |
3285 | ||
8f17154f | 3286 | return 0; |
9b53350d JPRV |
3287 | |
3288 | drop: | |
3289 | kfree_skb(skb); | |
3290 | return 0; | |
1c2acffb GP |
3291 | } |
3292 | ||
e072745f | 3293 | static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) |
1c2acffb GP |
3294 | { |
3295 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
6e3a5981 | 3296 | |
0e98958d GP |
3297 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), |
3298 | rx_control); | |
3299 | ||
6e3a5981 GP |
3300 | pi->expected_ack_seq = __get_reqseq(rx_control); |
3301 | l2cap_drop_acked_frames(sk); | |
1c2acffb | 3302 | |
e072745f | 3303 | if (rx_control & L2CAP_CTRL_POLL) { |
3cb123d1 | 3304 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; |
05fbd89d GP |
3305 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { |
3306 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
3307 | (pi->unacked_frames > 0)) | |
3308 | __mod_retrans_timer(); | |
3309 | ||
3310 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
3311 | l2cap_send_srejtail(sk); | |
3312 | } else { | |
3313 | l2cap_send_i_or_rr_or_rnr(sk); | |
05fbd89d | 3314 | } |
1d8f5d16 | 3315 | |
e072745f GP |
3316 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3317 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; | |
4ec10d97 | 3318 | |
e072745f GP |
3319 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) |
3320 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3321 | else |
3322 | l2cap_retransmit_frames(sk); | |
2246b2f1 | 3323 | |
e072745f | 3324 | } else { |
e072745f GP |
3325 | if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
3326 | (pi->unacked_frames > 0)) | |
3327 | __mod_retrans_timer(); | |
1c2acffb | 3328 | |
2246b2f1 | 3329 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
894718a6 | 3330 | if (pi->conn_state & L2CAP_CONN_SREJ_SENT) |
e072745f | 3331 | l2cap_send_ack(pi); |
894718a6 | 3332 | else |
e072745f GP |
3333 | l2cap_ertm_send(sk); |
3334 | } | |
3335 | } | |
2246b2f1 | 3336 | |
e072745f GP |
3337 | static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) |
3338 | { | |
3339 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3340 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3341 | |
0e98958d GP |
3342 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3343 | ||
e072745f GP |
3344 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3345 | ||
8abb52ee | 3346 | pi->expected_ack_seq = tx_seq; |
e072745f GP |
3347 | l2cap_drop_acked_frames(sk); |
3348 | ||
3349 | if (rx_control & L2CAP_CTRL_FINAL) { | |
3350 | if (pi->conn_state & L2CAP_CONN_REJ_ACT) | |
3351 | pi->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be GP |
3352 | else |
3353 | l2cap_retransmit_frames(sk); | |
e072745f | 3354 | } else { |
dfc909be | 3355 | l2cap_retransmit_frames(sk); |
30afb5b2 | 3356 | |
0301ef04 | 3357 | if (pi->conn_state & L2CAP_CONN_WAIT_F) |
e072745f | 3358 | pi->conn_state |= L2CAP_CONN_REJ_ACT; |
e072745f GP |
3359 | } |
3360 | } | |
3361 | static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) | |
3362 | { | |
3363 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3364 | u8 tx_seq = __get_reqseq(rx_control); | |
30afb5b2 | 3365 | |
0e98958d GP |
3366 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3367 | ||
e072745f | 3368 | pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3369 | |
e072745f GP |
3370 | if (rx_control & L2CAP_CTRL_POLL) { |
3371 | pi->expected_ack_seq = tx_seq; | |
3372 | l2cap_drop_acked_frames(sk); | |
3cb123d1 GP |
3373 | |
3374 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
dfc909be GP |
3375 | l2cap_retransmit_one_frame(sk, tx_seq); |
3376 | ||
e072745f | 3377 | l2cap_ertm_send(sk); |
dfc909be | 3378 | |
e072745f GP |
3379 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3380 | pi->srej_save_reqseq = tx_seq; | |
3381 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3382 | } |
e072745f GP |
3383 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
3384 | if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && | |
3385 | pi->srej_save_reqseq == tx_seq) | |
3386 | pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; | |
3387 | else | |
dfc909be | 3388 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f | 3389 | } else { |
dfc909be | 3390 | l2cap_retransmit_one_frame(sk, tx_seq); |
e072745f GP |
3391 | if (pi->conn_state & L2CAP_CONN_WAIT_F) { |
3392 | pi->srej_save_reqseq = tx_seq; | |
3393 | pi->conn_state |= L2CAP_CONN_SREJ_ACT; | |
ef54fd93 | 3394 | } |
e072745f GP |
3395 | } |
3396 | } | |
3397 | ||
3398 | static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) | |
3399 | { | |
3400 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3401 | u8 tx_seq = __get_reqseq(rx_control); | |
3402 | ||
0e98958d GP |
3403 | BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); |
3404 | ||
e072745f GP |
3405 | pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
3406 | pi->expected_ack_seq = tx_seq; | |
3407 | l2cap_drop_acked_frames(sk); | |
3408 | ||
3cb123d1 GP |
3409 | if (rx_control & L2CAP_CTRL_POLL) |
3410 | pi->conn_state |= L2CAP_CONN_SEND_FBIT; | |
3411 | ||
99b0d4b7 GP |
3412 | if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { |
3413 | del_timer(&pi->retrans_timer); | |
a2e12a2a GP |
3414 | if (rx_control & L2CAP_CTRL_POLL) |
3415 | l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); | |
99b0d4b7 | 3416 | return; |
e072745f | 3417 | } |
99b0d4b7 GP |
3418 | |
3419 | if (rx_control & L2CAP_CTRL_POLL) | |
3420 | l2cap_send_srejtail(sk); | |
3421 | else | |
3422 | l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); | |
e072745f GP |
3423 | } |
3424 | ||
3425 | static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) | |
3426 | { | |
3427 | BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); | |
3428 | ||
9b16dc65 GP |
3429 | if (L2CAP_CTRL_FINAL & rx_control && |
3430 | l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { | |
e072745f GP |
3431 | del_timer(&l2cap_pi(sk)->monitor_timer); |
3432 | if (l2cap_pi(sk)->unacked_frames > 0) | |
3433 | __mod_retrans_timer(); | |
3434 | l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; | |
3435 | } | |
3436 | ||
3437 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3438 | case L2CAP_SUPER_RCV_READY: | |
3439 | l2cap_data_channel_rrframe(sk, rx_control); | |
8f17154f GP |
3440 | break; |
3441 | ||
e072745f GP |
3442 | case L2CAP_SUPER_REJECT: |
3443 | l2cap_data_channel_rejframe(sk, rx_control); | |
3444 | break; | |
2246b2f1 | 3445 | |
e072745f GP |
3446 | case L2CAP_SUPER_SELECT_REJECT: |
3447 | l2cap_data_channel_srejframe(sk, rx_control); | |
3448 | break; | |
3449 | ||
3450 | case L2CAP_SUPER_RCV_NOT_READY: | |
3451 | l2cap_data_channel_rnrframe(sk, rx_control); | |
1c2acffb GP |
3452 | break; |
3453 | } | |
3454 | ||
faaebd19 | 3455 | kfree_skb(skb); |
1c2acffb GP |
3456 | return 0; |
3457 | } | |
3458 | ||
218bb9df GP |
3459 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3460 | { | |
3461 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
3462 | u16 control; | |
3463 | u8 req_seq; | |
3464 | int len, next_tx_seq_offset, req_seq_offset; | |
3465 | ||
3466 | control = get_unaligned_le16(skb->data); | |
3467 | skb_pull(skb, 2); | |
3468 | len = skb->len; | |
3469 | ||
3470 | /* | |
3471 | * We can just drop the corrupted I-frame here. | |
3472 | * Receiver will miss it and start proper recovery | |
3473 | * procedures and ask retransmission. | |
3474 | */ | |
3475 | if (l2cap_check_fcs(pi, skb)) | |
3476 | goto drop; | |
3477 | ||
3478 | if (__is_sar_start(control) && __is_iframe(control)) | |
3479 | len -= 2; | |
3480 | ||
3481 | if (pi->fcs == L2CAP_FCS_CRC16) | |
3482 | len -= 2; | |
3483 | ||
3484 | if (len > pi->mps) { | |
3485 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3486 | goto drop; | |
3487 | } | |
3488 | ||
3489 | req_seq = __get_reqseq(control); | |
3490 | req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; | |
3491 | if (req_seq_offset < 0) | |
3492 | req_seq_offset += 64; | |
3493 | ||
3494 | next_tx_seq_offset = | |
3495 | (pi->next_tx_seq - pi->expected_ack_seq) % 64; | |
3496 | if (next_tx_seq_offset < 0) | |
3497 | next_tx_seq_offset += 64; | |
3498 | ||
3499 | /* check for invalid req-seq */ | |
3500 | if (req_seq_offset > next_tx_seq_offset) { | |
3501 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3502 | goto drop; | |
3503 | } | |
3504 | ||
3505 | if (__is_iframe(control)) { | |
3506 | if (len < 0) { | |
3507 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3508 | goto drop; | |
3509 | } | |
3510 | ||
3511 | l2cap_data_channel_iframe(sk, control, skb); | |
3512 | } else { | |
3513 | if (len != 0) { | |
3514 | BT_ERR("%d", len); | |
3515 | l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); | |
3516 | goto drop; | |
3517 | } | |
3518 | ||
3519 | l2cap_data_channel_sframe(sk, control, skb); | |
3520 | } | |
3521 | ||
3522 | return 0; | |
3523 | ||
3524 | drop: | |
3525 | kfree_skb(skb); | |
3526 | return 0; | |
3527 | } | |
3528 | ||
1da177e4 LT |
3529 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3530 | { | |
3531 | struct sock *sk; | |
6840ed07 | 3532 | struct l2cap_pinfo *pi; |
51893f88 | 3533 | u16 control; |
218bb9df GP |
3534 | u8 tx_seq; |
3535 | int len; | |
1da177e4 LT |
3536 | |
3537 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); | |
3538 | if (!sk) { | |
3539 | BT_DBG("unknown cid 0x%4.4x", cid); | |
3540 | goto drop; | |
3541 | } | |
3542 | ||
6840ed07 GP |
3543 | pi = l2cap_pi(sk); |
3544 | ||
1da177e4 LT |
3545 | BT_DBG("sk %p, len %d", sk, skb->len); |
3546 | ||
3547 | if (sk->sk_state != BT_CONNECTED) | |
3548 | goto drop; | |
3549 | ||
6840ed07 | 3550 | switch (pi->mode) { |
1c2acffb GP |
3551 | case L2CAP_MODE_BASIC: |
3552 | /* If socket recv buffers overflows we drop data here | |
3553 | * which is *bad* because L2CAP has to be reliable. | |
3554 | * But we don't have any other choice. L2CAP doesn't | |
3555 | * provide flow control mechanism. */ | |
1da177e4 | 3556 | |
6840ed07 | 3557 | if (pi->imtu < skb->len) |
1c2acffb | 3558 | goto drop; |
1da177e4 | 3559 | |
1c2acffb GP |
3560 | if (!sock_queue_rcv_skb(sk, skb)) |
3561 | goto done; | |
3562 | break; | |
3563 | ||
3564 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3565 | if (!sock_owned_by_user(sk)) { |
3566 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3567 | } else { |
218bb9df | 3568 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3569 | goto drop; |
277ffbe3 | 3570 | } |
1c2acffb | 3571 | |
fcafde2e | 3572 | goto done; |
1c2acffb | 3573 | |
6840ed07 GP |
3574 | case L2CAP_MODE_STREAMING: |
3575 | control = get_unaligned_le16(skb->data); | |
3576 | skb_pull(skb, 2); | |
3577 | len = skb->len; | |
3578 | ||
26000089 GP |
3579 | if (l2cap_check_fcs(pi, skb)) |
3580 | goto drop; | |
3581 | ||
6840ed07 GP |
3582 | if (__is_sar_start(control)) |
3583 | len -= 2; | |
3584 | ||
fcc203c3 GP |
3585 | if (pi->fcs == L2CAP_FCS_CRC16) |
3586 | len -= 2; | |
3587 | ||
51893f88 | 3588 | if (len > pi->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3589 | goto drop; |
3590 | ||
3591 | tx_seq = __get_txseq(control); | |
3592 | ||
3593 | if (pi->expected_tx_seq == tx_seq) | |
3594 | pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; | |
3595 | else | |
7dffe421 | 3596 | pi->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3597 | |
18778a63 | 3598 | l2cap_streaming_reassembly_sdu(sk, skb, control); |
6840ed07 GP |
3599 | |
3600 | goto done; | |
3601 | ||
1c2acffb | 3602 | default: |
e8235c6b | 3603 | BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); |
1c2acffb GP |
3604 | break; |
3605 | } | |
1da177e4 LT |
3606 | |
3607 | drop: | |
3608 | kfree_skb(skb); | |
3609 | ||
3610 | done: | |
0139418c MH |
3611 | if (sk) |
3612 | bh_unlock_sock(sk); | |
3613 | ||
1da177e4 LT |
3614 | return 0; |
3615 | } | |
3616 | ||
8e036fc3 | 3617 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3618 | { |
3619 | struct sock *sk; | |
3620 | ||
3621 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3622 | if (!sk) | |
3623 | goto drop; | |
3624 | ||
e0f0cb56 GP |
3625 | bh_lock_sock(sk); |
3626 | ||
1da177e4 LT |
3627 | BT_DBG("sk %p, len %d", sk, skb->len); |
3628 | ||
3629 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3630 | goto drop; | |
3631 | ||
3632 | if (l2cap_pi(sk)->imtu < skb->len) | |
3633 | goto drop; | |
3634 | ||
3635 | if (!sock_queue_rcv_skb(sk, skb)) | |
3636 | goto done; | |
3637 | ||
3638 | drop: | |
3639 | kfree_skb(skb); | |
3640 | ||
3641 | done: | |
af05b30b GP |
3642 | if (sk) |
3643 | bh_unlock_sock(sk); | |
1da177e4 LT |
3644 | return 0; |
3645 | } | |
3646 | ||
3647 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) | |
3648 | { | |
3649 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3650 | u16 cid, len; |
3651 | __le16 psm; | |
1da177e4 LT |
3652 | |
3653 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3654 | cid = __le16_to_cpu(lh->cid); | |
3655 | len = __le16_to_cpu(lh->len); | |
3656 | ||
1c2acffb GP |
3657 | if (len != skb->len) { |
3658 | kfree_skb(skb); | |
3659 | return; | |
3660 | } | |
3661 | ||
1da177e4 LT |
3662 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3663 | ||
3664 | switch (cid) { | |
3300d9a9 | 3665 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3666 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3667 | l2cap_sig_channel(conn, skb); |
3668 | break; | |
3669 | ||
8db4dc46 | 3670 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3671 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3672 | skb_pull(skb, 2); |
3673 | l2cap_conless_channel(conn, psm, skb); | |
3674 | break; | |
3675 | ||
3676 | default: | |
3677 | l2cap_data_channel(conn, cid, skb); | |
3678 | break; | |
3679 | } | |
3680 | } | |
3681 | ||
3682 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3683 | ||
3684 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3685 | { | |
3686 | int exact = 0, lm1 = 0, lm2 = 0; | |
3687 | register struct sock *sk; | |
3688 | struct hlist_node *node; | |
3689 | ||
3690 | if (type != ACL_LINK) | |
963cf687 | 3691 | return -EINVAL; |
1da177e4 LT |
3692 | |
3693 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3694 | ||
3695 | /* Find listening sockets and check their link_mode */ | |
3696 | read_lock(&l2cap_sk_list.lock); | |
3697 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
3698 | if (sk->sk_state != BT_LISTEN) | |
3699 | continue; | |
3700 | ||
3701 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 MH |
3702 | lm1 |= HCI_LM_ACCEPT; |
3703 | if (l2cap_pi(sk)->role_switch) | |
3704 | lm1 |= HCI_LM_MASTER; | |
1da177e4 | 3705 | exact++; |
2af6b9d5 MH |
3706 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3707 | lm2 |= HCI_LM_ACCEPT; | |
3708 | if (l2cap_pi(sk)->role_switch) | |
3709 | lm2 |= HCI_LM_MASTER; | |
3710 | } | |
1da177e4 LT |
3711 | } |
3712 | read_unlock(&l2cap_sk_list.lock); | |
3713 | ||
3714 | return exact ? lm1 : lm2; | |
3715 | } | |
3716 | ||
3717 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3718 | { | |
0139418c MH |
3719 | struct l2cap_conn *conn; |
3720 | ||
1da177e4 LT |
3721 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3722 | ||
acd7d370 | 3723 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3724 | return -EINVAL; |
1da177e4 LT |
3725 | |
3726 | if (!status) { | |
1da177e4 LT |
3727 | conn = l2cap_conn_add(hcon, status); |
3728 | if (conn) | |
3729 | l2cap_conn_ready(conn); | |
0139418c | 3730 | } else |
1da177e4 LT |
3731 | l2cap_conn_del(hcon, bt_err(status)); |
3732 | ||
3733 | return 0; | |
3734 | } | |
3735 | ||
2950f21a MH |
3736 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3737 | { | |
3738 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3739 | ||
3740 | BT_DBG("hcon %p", hcon); | |
3741 | ||
3742 | if (hcon->type != ACL_LINK || !conn) | |
3743 | return 0x13; | |
3744 | ||
3745 | return conn->disc_reason; | |
3746 | } | |
3747 | ||
3748 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3749 | { |
3750 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3751 | ||
acd7d370 | 3752 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3753 | return -EINVAL; |
1da177e4 LT |
3754 | |
3755 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 3756 | |
1da177e4 LT |
3757 | return 0; |
3758 | } | |
3759 | ||
f62e4323 MH |
3760 | static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) |
3761 | { | |
bd3c9e25 | 3762 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
3763 | return; |
3764 | ||
f62e4323 MH |
3765 | if (encrypt == 0x00) { |
3766 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { | |
3767 | l2cap_sock_clear_timer(sk); | |
3768 | l2cap_sock_set_timer(sk, HZ * 5); | |
3769 | } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) | |
3770 | __l2cap_sock_close(sk, ECONNREFUSED); | |
3771 | } else { | |
3772 | if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) | |
3773 | l2cap_sock_clear_timer(sk); | |
3774 | } | |
3775 | } | |
3776 | ||
8c1b2355 | 3777 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 LT |
3778 | { |
3779 | struct l2cap_chan_list *l; | |
0139418c | 3780 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 3781 | struct sock *sk; |
1da177e4 | 3782 | |
0139418c | 3783 | if (!conn) |
1da177e4 | 3784 | return 0; |
0139418c | 3785 | |
1da177e4 LT |
3786 | l = &conn->chan_list; |
3787 | ||
3788 | BT_DBG("conn %p", conn); | |
3789 | ||
3790 | read_lock(&l->lock); | |
3791 | ||
3792 | for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { | |
3793 | bh_lock_sock(sk); | |
3794 | ||
6a8d3010 MH |
3795 | if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { |
3796 | bh_unlock_sock(sk); | |
3797 | continue; | |
3798 | } | |
3799 | ||
f62e4323 | 3800 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 3801 | sk->sk_state == BT_CONFIG)) { |
f62e4323 | 3802 | l2cap_check_encryption(sk, encrypt); |
9719f8af MH |
3803 | bh_unlock_sock(sk); |
3804 | continue; | |
3805 | } | |
3806 | ||
b1235d79 MH |
3807 | if (sk->sk_state == BT_CONNECT) { |
3808 | if (!status) { | |
3809 | struct l2cap_conn_req req; | |
3810 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3811 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 3812 | |
b1235d79 | 3813 | l2cap_pi(sk)->ident = l2cap_get_ident(conn); |
e501d055 | 3814 | l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 3815 | |
b1235d79 MH |
3816 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3817 | L2CAP_CONN_REQ, sizeof(req), &req); | |
3818 | } else { | |
3819 | l2cap_sock_clear_timer(sk); | |
3820 | l2cap_sock_set_timer(sk, HZ / 10); | |
3821 | } | |
3822 | } else if (sk->sk_state == BT_CONNECT2) { | |
3823 | struct l2cap_conn_rsp rsp; | |
3824 | __u16 result; | |
1da177e4 | 3825 | |
b1235d79 MH |
3826 | if (!status) { |
3827 | sk->sk_state = BT_CONFIG; | |
3828 | result = L2CAP_CR_SUCCESS; | |
3829 | } else { | |
3830 | sk->sk_state = BT_DISCONN; | |
3831 | l2cap_sock_set_timer(sk, HZ / 10); | |
3832 | result = L2CAP_CR_SEC_BLOCK; | |
3833 | } | |
3834 | ||
3835 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
3836 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3837 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 3838 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
b1235d79 MH |
3839 | l2cap_send_cmd(conn, l2cap_pi(sk)->ident, |
3840 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
3841 | } | |
1da177e4 LT |
3842 | |
3843 | bh_unlock_sock(sk); | |
3844 | } | |
3845 | ||
3846 | read_unlock(&l->lock); | |
b1235d79 | 3847 | |
1da177e4 LT |
3848 | return 0; |
3849 | } | |
3850 | ||
3851 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
3852 | { | |
3853 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3854 | ||
5a08ecce AE |
3855 | if (!conn) |
3856 | conn = l2cap_conn_add(hcon, 0); | |
3857 | ||
3858 | if (!conn) | |
1da177e4 LT |
3859 | goto drop; |
3860 | ||
3861 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
3862 | ||
e702112f | 3863 | if (!(flags & ACL_CONT)) { |
1da177e4 | 3864 | struct l2cap_hdr *hdr; |
89794813 AE |
3865 | struct sock *sk; |
3866 | u16 cid; | |
1da177e4 LT |
3867 | int len; |
3868 | ||
3869 | if (conn->rx_len) { | |
3870 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
3871 | kfree_skb(conn->rx_skb); | |
3872 | conn->rx_skb = NULL; | |
3873 | conn->rx_len = 0; | |
3874 | l2cap_conn_unreliable(conn, ECOMM); | |
3875 | } | |
3876 | ||
aae7fe22 AE |
3877 | /* Start fragment always begin with Basic L2CAP header */ |
3878 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
3879 | BT_ERR("Frame is too short (len %d)", skb->len); |
3880 | l2cap_conn_unreliable(conn, ECOMM); | |
3881 | goto drop; | |
3882 | } | |
3883 | ||
3884 | hdr = (struct l2cap_hdr *) skb->data; | |
3885 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 3886 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
3887 | |
3888 | if (len == skb->len) { | |
3889 | /* Complete frame received */ | |
3890 | l2cap_recv_frame(conn, skb); | |
3891 | return 0; | |
3892 | } | |
3893 | ||
3894 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
3895 | ||
3896 | if (skb->len > len) { | |
3897 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
3898 | skb->len, len); | |
3899 | l2cap_conn_unreliable(conn, ECOMM); | |
3900 | goto drop; | |
3901 | } | |
3902 | ||
89794813 AE |
3903 | sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); |
3904 | ||
3905 | if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) { | |
3906 | BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)", | |
3907 | len, l2cap_pi(sk)->imtu); | |
3908 | bh_unlock_sock(sk); | |
3909 | l2cap_conn_unreliable(conn, ECOMM); | |
3910 | goto drop; | |
3911 | } | |
3912 | ||
3913 | if (sk) | |
3914 | bh_unlock_sock(sk); | |
3915 | ||
1da177e4 | 3916 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
3917 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
3918 | if (!conn->rx_skb) | |
1da177e4 LT |
3919 | goto drop; |
3920 | ||
d626f62b | 3921 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 3922 | skb->len); |
1da177e4 LT |
3923 | conn->rx_len = len - skb->len; |
3924 | } else { | |
3925 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
3926 | ||
3927 | if (!conn->rx_len) { | |
3928 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
3929 | l2cap_conn_unreliable(conn, ECOMM); | |
3930 | goto drop; | |
3931 | } | |
3932 | ||
3933 | if (skb->len > conn->rx_len) { | |
3934 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
3935 | skb->len, conn->rx_len); | |
3936 | kfree_skb(conn->rx_skb); | |
3937 | conn->rx_skb = NULL; | |
3938 | conn->rx_len = 0; | |
3939 | l2cap_conn_unreliable(conn, ECOMM); | |
3940 | goto drop; | |
3941 | } | |
3942 | ||
d626f62b | 3943 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 3944 | skb->len); |
1da177e4 LT |
3945 | conn->rx_len -= skb->len; |
3946 | ||
3947 | if (!conn->rx_len) { | |
3948 | /* Complete frame received */ | |
3949 | l2cap_recv_frame(conn, conn->rx_skb); | |
3950 | conn->rx_skb = NULL; | |
3951 | } | |
3952 | } | |
3953 | ||
3954 | drop: | |
3955 | kfree_skb(skb); | |
3956 | return 0; | |
3957 | } | |
3958 | ||
aef7d97c | 3959 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
3960 | { |
3961 | struct sock *sk; | |
3962 | struct hlist_node *node; | |
1da177e4 LT |
3963 | |
3964 | read_lock_bh(&l2cap_sk_list.lock); | |
3965 | ||
be9d1227 MH |
3966 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
3967 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
101545f6 | 3968 | |
903d343e | 3969 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
3970 | batostr(&bt_sk(sk)->src), |
3971 | batostr(&bt_sk(sk)->dst), | |
3972 | sk->sk_state, __le16_to_cpu(pi->psm), | |
3973 | pi->scid, pi->dcid, | |
903d343e GP |
3974 | pi->imtu, pi->omtu, pi->sec_level, |
3975 | pi->mode); | |
be9d1227 | 3976 | } |
1da177e4 | 3977 | |
1da177e4 | 3978 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 3979 | |
aef7d97c | 3980 | return 0; |
1da177e4 LT |
3981 | } |
3982 | ||
aef7d97c MH |
3983 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
3984 | { | |
3985 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
3986 | } | |
3987 | ||
3988 | static const struct file_operations l2cap_debugfs_fops = { | |
3989 | .open = l2cap_debugfs_open, | |
3990 | .read = seq_read, | |
3991 | .llseek = seq_lseek, | |
3992 | .release = single_release, | |
3993 | }; | |
3994 | ||
3995 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 3996 | |
1da177e4 LT |
3997 | static struct hci_proto l2cap_hci_proto = { |
3998 | .name = "L2CAP", | |
3999 | .id = HCI_PROTO_L2CAP, | |
4000 | .connect_ind = l2cap_connect_ind, | |
4001 | .connect_cfm = l2cap_connect_cfm, | |
4002 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4003 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4004 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4005 | .recv_acldata = l2cap_recv_acldata |
4006 | }; | |
4007 | ||
64274518 | 4008 | int __init l2cap_init(void) |
1da177e4 LT |
4009 | { |
4010 | int err; | |
be9d1227 | 4011 | |
bb58f747 | 4012 | err = l2cap_init_sockets(); |
1da177e4 LT |
4013 | if (err < 0) |
4014 | return err; | |
4015 | ||
1890d36b | 4016 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4017 | if (!_busy_wq) { |
bb58f747 | 4018 | err = -ENOMEM; |
1da177e4 LT |
4019 | goto error; |
4020 | } | |
4021 | ||
4022 | err = hci_register_proto(&l2cap_hci_proto); | |
4023 | if (err < 0) { | |
4024 | BT_ERR("L2CAP protocol registration failed"); | |
4025 | bt_sock_unregister(BTPROTO_L2CAP); | |
4026 | goto error; | |
4027 | } | |
4028 | ||
aef7d97c MH |
4029 | if (bt_debugfs) { |
4030 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4031 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4032 | if (!l2cap_debugfs) | |
4033 | BT_ERR("Failed to create L2CAP debug file"); | |
4034 | } | |
1da177e4 | 4035 | |
1da177e4 LT |
4036 | return 0; |
4037 | ||
4038 | error: | |
b78d7b4f | 4039 | destroy_workqueue(_busy_wq); |
bb58f747 | 4040 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4041 | return err; |
4042 | } | |
4043 | ||
64274518 | 4044 | void l2cap_exit(void) |
1da177e4 | 4045 | { |
aef7d97c | 4046 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4047 | |
1890d36b GP |
4048 | flush_workqueue(_busy_wq); |
4049 | destroy_workqueue(_busy_wq); | |
4050 | ||
1da177e4 LT |
4051 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4052 | BT_ERR("L2CAP protocol unregistration failed"); | |
4053 | ||
bb58f747 | 4054 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4055 | } |
4056 | ||
d1c4a17d GP |
4057 | module_param(disable_ertm, bool, 0644); |
4058 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |