Commit | Line | Data |
---|---|---|
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); | |
710f9b0a | 73 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data); |
1da177e4 | 74 | |
218bb9df GP |
75 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); |
76 | ||
0139418c | 77 | /* ---- L2CAP channels ---- */ |
baa7e1fa | 78 | static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid) |
0139418c | 79 | { |
48454079 | 80 | struct l2cap_chan *c; |
baa7e1fa GP |
81 | |
82 | list_for_each_entry(c, &conn->chan_l, list) { | |
83 | struct sock *s = c->sk; | |
84 | if (l2cap_pi(s)->dcid == cid) | |
85 | return c; | |
0139418c | 86 | } |
baa7e1fa GP |
87 | return NULL; |
88 | ||
0139418c MH |
89 | } |
90 | ||
baa7e1fa | 91 | static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 92 | { |
48454079 | 93 | struct l2cap_chan *c; |
baa7e1fa GP |
94 | |
95 | list_for_each_entry(c, &conn->chan_l, list) { | |
96 | struct sock *s = c->sk; | |
97 | if (l2cap_pi(s)->scid == cid) | |
98 | return c; | |
0139418c | 99 | } |
baa7e1fa | 100 | return NULL; |
0139418c MH |
101 | } |
102 | ||
103 | /* Find channel with given SCID. | |
104 | * Returns locked socket */ | |
baa7e1fa | 105 | static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid) |
0139418c | 106 | { |
48454079 | 107 | struct l2cap_chan *c; |
baa7e1fa GP |
108 | |
109 | read_lock(&conn->chan_lock); | |
110 | c = __l2cap_get_chan_by_scid(conn, cid); | |
48454079 GP |
111 | if (c) |
112 | bh_lock_sock(c->sk); | |
baa7e1fa | 113 | read_unlock(&conn->chan_lock); |
48454079 | 114 | return c; |
0139418c MH |
115 | } |
116 | ||
baa7e1fa | 117 | static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 118 | { |
48454079 | 119 | struct l2cap_chan *c; |
baa7e1fa GP |
120 | |
121 | list_for_each_entry(c, &conn->chan_l, list) { | |
fc7f8a7e | 122 | if (c->ident == ident) |
baa7e1fa | 123 | return c; |
0139418c | 124 | } |
baa7e1fa | 125 | return NULL; |
0139418c MH |
126 | } |
127 | ||
baa7e1fa | 128 | static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident) |
0139418c | 129 | { |
48454079 | 130 | struct l2cap_chan *c; |
baa7e1fa GP |
131 | |
132 | read_lock(&conn->chan_lock); | |
133 | c = __l2cap_get_chan_by_ident(conn, ident); | |
48454079 GP |
134 | if (c) |
135 | bh_lock_sock(c->sk); | |
baa7e1fa | 136 | read_unlock(&conn->chan_lock); |
48454079 | 137 | return c; |
0139418c MH |
138 | } |
139 | ||
baa7e1fa | 140 | static u16 l2cap_alloc_cid(struct l2cap_conn *conn) |
0139418c | 141 | { |
8db4dc46 | 142 | u16 cid = L2CAP_CID_DYN_START; |
0139418c | 143 | |
8db4dc46 | 144 | for (; cid < L2CAP_CID_DYN_END; cid++) { |
baa7e1fa | 145 | if (!__l2cap_get_chan_by_scid(conn, cid)) |
0139418c MH |
146 | return cid; |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
5d41ce1d | 152 | struct l2cap_chan *l2cap_chan_alloc(struct sock *sk) |
48454079 GP |
153 | { |
154 | struct l2cap_chan *chan; | |
155 | ||
156 | chan = kzalloc(sizeof(*chan), GFP_ATOMIC); | |
157 | if (!chan) | |
158 | return NULL; | |
159 | ||
160 | chan->sk = sk; | |
161 | ||
162 | return chan; | |
163 | } | |
164 | ||
48454079 | 165 | static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
0139418c | 166 | { |
48454079 | 167 | struct sock *sk = chan->sk; |
0139418c | 168 | |
af05b30b GP |
169 | BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, |
170 | l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); | |
0139418c | 171 | |
2950f21a MH |
172 | conn->disc_reason = 0x13; |
173 | ||
0139418c MH |
174 | l2cap_pi(sk)->conn = conn; |
175 | ||
bd3c9e25 | 176 | if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { |
b62f328b VT |
177 | if (conn->hcon->type == LE_LINK) { |
178 | /* LE connection */ | |
0c1bc5c6 | 179 | chan->omtu = L2CAP_LE_DEFAULT_MTU; |
b62f328b VT |
180 | l2cap_pi(sk)->scid = L2CAP_CID_LE_DATA; |
181 | l2cap_pi(sk)->dcid = L2CAP_CID_LE_DATA; | |
182 | } else { | |
183 | /* Alloc CID for connection-oriented socket */ | |
baa7e1fa | 184 | l2cap_pi(sk)->scid = l2cap_alloc_cid(conn); |
0c1bc5c6 | 185 | chan->omtu = L2CAP_DEFAULT_MTU; |
b62f328b | 186 | } |
0139418c MH |
187 | } else if (sk->sk_type == SOCK_DGRAM) { |
188 | /* Connectionless socket */ | |
8db4dc46 GP |
189 | l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; |
190 | l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; | |
0c1bc5c6 | 191 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
192 | } else { |
193 | /* Raw socket can send/recv signalling messages only */ | |
8db4dc46 GP |
194 | l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; |
195 | l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; | |
0c1bc5c6 | 196 | chan->omtu = L2CAP_DEFAULT_MTU; |
0139418c MH |
197 | } |
198 | ||
baa7e1fa GP |
199 | sock_hold(sk); |
200 | ||
201 | list_add(&chan->list, &conn->chan_l); | |
0139418c MH |
202 | } |
203 | ||
8e87d142 | 204 | /* Delete channel. |
0139418c | 205 | * Must be called on the locked socket. */ |
48454079 | 206 | void l2cap_chan_del(struct l2cap_chan *chan, int err) |
0139418c | 207 | { |
48454079 | 208 | struct sock *sk = chan->sk; |
0139418c MH |
209 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
210 | struct sock *parent = bt_sk(sk)->parent; | |
211 | ||
212 | l2cap_sock_clear_timer(sk); | |
213 | ||
49208c9c | 214 | BT_DBG("chan %p, conn %p, err %d", chan, conn, err); |
0139418c | 215 | |
8e87d142 | 216 | if (conn) { |
baa7e1fa GP |
217 | /* Delete from channel list */ |
218 | write_lock_bh(&conn->chan_lock); | |
219 | list_del(&chan->list); | |
220 | write_unlock_bh(&conn->chan_lock); | |
221 | __sock_put(sk); | |
222 | ||
0139418c MH |
223 | l2cap_pi(sk)->conn = NULL; |
224 | hci_conn_put(conn->hcon); | |
225 | } | |
226 | ||
b1235d79 | 227 | sk->sk_state = BT_CLOSED; |
0139418c MH |
228 | sock_set_flag(sk, SOCK_ZAPPED); |
229 | ||
230 | if (err) | |
231 | sk->sk_err = err; | |
232 | ||
233 | if (parent) { | |
234 | bt_accept_unlink(sk); | |
235 | parent->sk_data_ready(parent, 0); | |
236 | } else | |
237 | sk->sk_state_change(sk); | |
c13ffa62 | 238 | |
b4450035 GP |
239 | if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE && |
240 | chan->conf_state & L2CAP_CONF_INPUT_DONE)) | |
2ead70b8 GP |
241 | goto free; |
242 | ||
58d35f87 | 243 | skb_queue_purge(&chan->tx_q); |
c13ffa62 | 244 | |
0c1bc5c6 | 245 | if (chan->mode == L2CAP_MODE_ERTM) { |
c13ffa62 GP |
246 | struct srej_list *l, *tmp; |
247 | ||
e92c8e70 GP |
248 | del_timer(&chan->retrans_timer); |
249 | del_timer(&chan->monitor_timer); | |
250 | del_timer(&chan->ack_timer); | |
c13ffa62 | 251 | |
f1c6775b GP |
252 | skb_queue_purge(&chan->srej_q); |
253 | skb_queue_purge(&chan->busy_q); | |
c13ffa62 | 254 | |
39d5a3ee | 255 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
c13ffa62 GP |
256 | list_del(&l->list); |
257 | kfree(l); | |
258 | } | |
259 | } | |
48454079 | 260 | |
2ead70b8 | 261 | free: |
48454079 | 262 | kfree(chan); |
0139418c MH |
263 | } |
264 | ||
4343478f | 265 | static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan) |
79d554a6 | 266 | { |
4343478f GP |
267 | struct sock *sk = chan->sk; |
268 | ||
8556edd3 | 269 | if (sk->sk_type == SOCK_RAW) { |
4343478f | 270 | switch (chan->sec_level) { |
8556edd3 JH |
271 | case BT_SECURITY_HIGH: |
272 | return HCI_AT_DEDICATED_BONDING_MITM; | |
273 | case BT_SECURITY_MEDIUM: | |
274 | return HCI_AT_DEDICATED_BONDING; | |
275 | default: | |
276 | return HCI_AT_NO_BONDING; | |
277 | } | |
278 | } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { | |
4343478f GP |
279 | if (chan->sec_level == BT_SECURITY_LOW) |
280 | chan->sec_level = BT_SECURITY_SDP; | |
0684e5f9 | 281 | |
4343478f | 282 | if (chan->sec_level == BT_SECURITY_HIGH) |
8556edd3 | 283 | return HCI_AT_NO_BONDING_MITM; |
00ae4af9 | 284 | else |
8556edd3 | 285 | return HCI_AT_NO_BONDING; |
00ae4af9 | 286 | } else { |
4343478f | 287 | switch (chan->sec_level) { |
00ae4af9 | 288 | case BT_SECURITY_HIGH: |
8556edd3 | 289 | return HCI_AT_GENERAL_BONDING_MITM; |
00ae4af9 | 290 | case BT_SECURITY_MEDIUM: |
8556edd3 | 291 | return HCI_AT_GENERAL_BONDING; |
00ae4af9 | 292 | default: |
8556edd3 | 293 | return HCI_AT_NO_BONDING; |
00ae4af9 | 294 | } |
0684e5f9 | 295 | } |
8556edd3 JH |
296 | } |
297 | ||
298 | /* Service level security */ | |
4343478f | 299 | static inline int l2cap_check_security(struct l2cap_chan *chan) |
8556edd3 | 300 | { |
4343478f | 301 | struct l2cap_conn *conn = l2cap_pi(chan->sk)->conn; |
8556edd3 JH |
302 | __u8 auth_type; |
303 | ||
4343478f | 304 | auth_type = l2cap_get_auth_type(chan); |
79d554a6 | 305 | |
4343478f | 306 | return hci_conn_security(conn->hcon, chan->sec_level, auth_type); |
79d554a6 MH |
307 | } |
308 | ||
68983259 | 309 | u8 l2cap_get_ident(struct l2cap_conn *conn) |
4e8402a3 MH |
310 | { |
311 | u8 id; | |
312 | ||
313 | /* Get next available identificator. | |
314 | * 1 - 128 are used by kernel. | |
315 | * 129 - 199 are reserved. | |
316 | * 200 - 254 are used by utilities like l2ping, etc. | |
317 | */ | |
318 | ||
319 | spin_lock_bh(&conn->lock); | |
320 | ||
321 | if (++conn->tx_ident > 128) | |
322 | conn->tx_ident = 1; | |
323 | ||
324 | id = conn->tx_ident; | |
325 | ||
326 | spin_unlock_bh(&conn->lock); | |
327 | ||
328 | return id; | |
329 | } | |
330 | ||
68983259 | 331 | void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) |
4e8402a3 MH |
332 | { |
333 | struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); | |
e702112f | 334 | u8 flags; |
4e8402a3 MH |
335 | |
336 | BT_DBG("code 0x%2.2x", code); | |
337 | ||
338 | if (!skb) | |
9a9c6a34 | 339 | return; |
4e8402a3 | 340 | |
e702112f AE |
341 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
342 | flags = ACL_START_NO_FLUSH; | |
343 | else | |
344 | flags = ACL_START; | |
345 | ||
346 | hci_send_acl(conn->hcon, skb, flags); | |
4e8402a3 MH |
347 | } |
348 | ||
525cd185 | 349 | static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control) |
1c2acffb GP |
350 | { |
351 | struct sk_buff *skb; | |
352 | struct l2cap_hdr *lh; | |
525cd185 | 353 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1c2acffb | 354 | struct l2cap_conn *conn = pi->conn; |
c13ffa62 | 355 | struct sock *sk = (struct sock *)pi; |
fcc203c3 | 356 | int count, hlen = L2CAP_HDR_SIZE + 2; |
e702112f | 357 | u8 flags; |
fcc203c3 | 358 | |
c13ffa62 GP |
359 | if (sk->sk_state != BT_CONNECTED) |
360 | return; | |
361 | ||
47d1ec61 | 362 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 | 363 | hlen += 2; |
1c2acffb | 364 | |
49208c9c | 365 | BT_DBG("chan %p, control 0x%2.2x", chan, control); |
1c2acffb | 366 | |
fcc203c3 | 367 | count = min_t(unsigned int, conn->mtu, hlen); |
1c2acffb GP |
368 | control |= L2CAP_CTRL_FRAME_TYPE; |
369 | ||
525cd185 | 370 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
9e917af1 | 371 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 372 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
9e917af1 GP |
373 | } |
374 | ||
525cd185 | 375 | if (chan->conn_state & L2CAP_CONN_SEND_PBIT) { |
f0946ccf | 376 | control |= L2CAP_CTRL_POLL; |
525cd185 | 377 | chan->conn_state &= ~L2CAP_CONN_SEND_PBIT; |
f0946ccf GP |
378 | } |
379 | ||
1c2acffb GP |
380 | skb = bt_skb_alloc(count, GFP_ATOMIC); |
381 | if (!skb) | |
9a9c6a34 | 382 | return; |
1c2acffb GP |
383 | |
384 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
fcc203c3 | 385 | lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); |
1c2acffb GP |
386 | lh->cid = cpu_to_le16(pi->dcid); |
387 | put_unaligned_le16(control, skb_put(skb, 2)); | |
388 | ||
47d1ec61 | 389 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
390 | u16 fcs = crc16(0, (u8 *)lh, count - 2); |
391 | put_unaligned_le16(fcs, skb_put(skb, 2)); | |
392 | } | |
393 | ||
e702112f AE |
394 | if (lmp_no_flush_capable(conn->hcon->hdev)) |
395 | flags = ACL_START_NO_FLUSH; | |
396 | else | |
397 | flags = ACL_START; | |
398 | ||
399 | hci_send_acl(pi->conn->hcon, skb, flags); | |
1c2acffb GP |
400 | } |
401 | ||
525cd185 | 402 | static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control) |
7e743090 | 403 | { |
525cd185 | 404 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
7e743090 | 405 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 406 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 407 | } else |
7e743090 GP |
408 | control |= L2CAP_SUPER_RCV_READY; |
409 | ||
42e5c802 | 410 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
2ab25cdd | 411 | |
525cd185 | 412 | l2cap_send_sframe(chan, control); |
7e743090 GP |
413 | } |
414 | ||
b4450035 | 415 | static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan) |
e501d055 | 416 | { |
b4450035 | 417 | return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND); |
e501d055 AE |
418 | } |
419 | ||
fc7f8a7e | 420 | static void l2cap_do_start(struct l2cap_chan *chan) |
79d554a6 | 421 | { |
fc7f8a7e | 422 | struct sock *sk = chan->sk; |
79d554a6 MH |
423 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
424 | ||
425 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { | |
984947dc MH |
426 | if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) |
427 | return; | |
428 | ||
4343478f GP |
429 | if (l2cap_check_security(chan) && |
430 | __l2cap_no_conn_pending(chan)) { | |
b1235d79 MH |
431 | struct l2cap_conn_req req; |
432 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
433 | req.psm = l2cap_pi(sk)->psm; | |
79d554a6 | 434 | |
fc7f8a7e | 435 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 436 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
79d554a6 | 437 | |
fc7f8a7e GP |
438 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
439 | sizeof(req), &req); | |
b1235d79 | 440 | } |
79d554a6 MH |
441 | } else { |
442 | struct l2cap_info_req req; | |
443 | req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
444 | ||
445 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
446 | conn->info_ident = l2cap_get_ident(conn); | |
447 | ||
448 | mod_timer(&conn->info_timer, jiffies + | |
449 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
450 | ||
451 | l2cap_send_cmd(conn, conn->info_ident, | |
452 | L2CAP_INFO_REQ, sizeof(req), &req); | |
453 | } | |
454 | } | |
455 | ||
cf6c2c0b GP |
456 | static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) |
457 | { | |
458 | u32 local_feat_mask = l2cap_feat_mask; | |
d1c4a17d | 459 | if (!disable_ertm) |
cf6c2c0b GP |
460 | local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; |
461 | ||
462 | switch (mode) { | |
463 | case L2CAP_MODE_ERTM: | |
464 | return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; | |
465 | case L2CAP_MODE_STREAMING: | |
466 | return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; | |
467 | default: | |
468 | return 0x00; | |
469 | } | |
470 | } | |
471 | ||
e92c8e70 | 472 | void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err) |
22121fc9 | 473 | { |
e92c8e70 | 474 | struct sock *sk; |
22121fc9 GP |
475 | struct l2cap_disconn_req req; |
476 | ||
c13ffa62 GP |
477 | if (!conn) |
478 | return; | |
479 | ||
e92c8e70 GP |
480 | sk = chan->sk; |
481 | ||
0c1bc5c6 | 482 | if (chan->mode == L2CAP_MODE_ERTM) { |
e92c8e70 GP |
483 | del_timer(&chan->retrans_timer); |
484 | del_timer(&chan->monitor_timer); | |
485 | del_timer(&chan->ack_timer); | |
c13ffa62 GP |
486 | } |
487 | ||
22121fc9 GP |
488 | req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); |
489 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
490 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
491 | L2CAP_DISCONN_REQ, sizeof(req), &req); | |
c13ffa62 GP |
492 | |
493 | sk->sk_state = BT_DISCONN; | |
9b108fc0 | 494 | sk->sk_err = err; |
22121fc9 GP |
495 | } |
496 | ||
1da177e4 | 497 | /* ---- L2CAP connections ---- */ |
4e8402a3 MH |
498 | static void l2cap_conn_start(struct l2cap_conn *conn) |
499 | { | |
820ffdb3 | 500 | struct l2cap_chan *chan, *tmp; |
4e8402a3 MH |
501 | |
502 | BT_DBG("conn %p", conn); | |
503 | ||
baa7e1fa | 504 | read_lock(&conn->chan_lock); |
4e8402a3 | 505 | |
820ffdb3 | 506 | list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) { |
48454079 | 507 | struct sock *sk = chan->sk; |
baa7e1fa | 508 | |
4e8402a3 MH |
509 | bh_lock_sock(sk); |
510 | ||
bd3c9e25 GP |
511 | if (sk->sk_type != SOCK_SEQPACKET && |
512 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
513 | bh_unlock_sock(sk); |
514 | continue; | |
515 | } | |
516 | ||
517 | if (sk->sk_state == BT_CONNECT) { | |
47731de7 | 518 | struct l2cap_conn_req req; |
79d554a6 | 519 | |
4343478f | 520 | if (!l2cap_check_security(chan) || |
b4450035 | 521 | !__l2cap_no_conn_pending(chan)) { |
47731de7 GP |
522 | bh_unlock_sock(sk); |
523 | continue; | |
524 | } | |
79d554a6 | 525 | |
0c1bc5c6 | 526 | if (!l2cap_mode_supported(chan->mode, |
47731de7 | 527 | conn->feat_mask) |
b4450035 | 528 | && chan->conf_state & |
47731de7 | 529 | L2CAP_CONF_STATE2_DEVICE) { |
820ffdb3 GP |
530 | /* __l2cap_sock_close() calls list_del(chan) |
531 | * so release the lock */ | |
532 | read_unlock_bh(&conn->chan_lock); | |
533 | __l2cap_sock_close(sk, ECONNRESET); | |
534 | read_lock_bh(&conn->chan_lock); | |
47731de7 GP |
535 | bh_unlock_sock(sk); |
536 | continue; | |
b1235d79 | 537 | } |
47731de7 GP |
538 | |
539 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
540 | req.psm = l2cap_pi(sk)->psm; | |
541 | ||
fc7f8a7e | 542 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 543 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
47731de7 | 544 | |
fc7f8a7e GP |
545 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, |
546 | sizeof(req), &req); | |
47731de7 | 547 | |
79d554a6 MH |
548 | } else if (sk->sk_state == BT_CONNECT2) { |
549 | struct l2cap_conn_rsp rsp; | |
e9aeb2dd | 550 | char buf[128]; |
79d554a6 MH |
551 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
552 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
553 | ||
4343478f | 554 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
555 | if (bt_sk(sk)->defer_setup) { |
556 | struct sock *parent = bt_sk(sk)->parent; | |
557 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
558 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); | |
559 | parent->sk_data_ready(parent, 0); | |
560 | ||
561 | } else { | |
562 | sk->sk_state = BT_CONFIG; | |
563 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
564 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
565 | } | |
79d554a6 MH |
566 | } else { |
567 | rsp.result = cpu_to_le16(L2CAP_CR_PEND); | |
568 | rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); | |
569 | } | |
570 | ||
fc7f8a7e GP |
571 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
572 | sizeof(rsp), &rsp); | |
e9aeb2dd | 573 | |
b4450035 | 574 | if (chan->conf_state & L2CAP_CONF_REQ_SENT || |
e9aeb2dd GP |
575 | rsp.result != L2CAP_CR_SUCCESS) { |
576 | bh_unlock_sock(sk); | |
577 | continue; | |
578 | } | |
579 | ||
b4450035 | 580 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 581 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
582 | l2cap_build_conf_req(chan, buf), buf); |
583 | chan->num_conf_req++; | |
4e8402a3 MH |
584 | } |
585 | ||
586 | bh_unlock_sock(sk); | |
587 | } | |
588 | ||
baa7e1fa | 589 | read_unlock(&conn->chan_lock); |
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 | { | |
280f294f | 597 | struct sock *sk = NULL, *sk1 = NULL; |
b62f328b VT |
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 | } | |
280f294f | 616 | |
b62f328b VT |
617 | read_unlock(&l2cap_sk_list.lock); |
618 | ||
280f294f | 619 | return node ? sk : sk1; |
b62f328b VT |
620 | } |
621 | ||
622 | static void l2cap_le_conn_ready(struct l2cap_conn *conn) | |
623 | { | |
c916fbe4 | 624 | struct sock *parent, *sk; |
48454079 | 625 | struct l2cap_chan *chan; |
b62f328b VT |
626 | |
627 | BT_DBG(""); | |
628 | ||
629 | /* Check if we have socket listening on cid */ | |
630 | parent = l2cap_get_sock_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA, | |
631 | conn->src); | |
632 | if (!parent) | |
633 | return; | |
634 | ||
62f3a2cf GP |
635 | bh_lock_sock(parent); |
636 | ||
b62f328b VT |
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 | ||
48454079 GP |
647 | chan = l2cap_chan_alloc(sk); |
648 | if (!chan) { | |
649 | l2cap_sock_kill(sk); | |
650 | goto clean; | |
651 | } | |
652 | ||
5d41ce1d GP |
653 | l2cap_pi(sk)->chan = chan; |
654 | ||
baa7e1fa | 655 | write_lock_bh(&conn->chan_lock); |
b62f328b VT |
656 | |
657 | hci_conn_hold(conn->hcon); | |
658 | ||
659 | l2cap_sock_init(sk, parent); | |
baa7e1fa | 660 | |
b62f328b VT |
661 | bacpy(&bt_sk(sk)->src, conn->src); |
662 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
663 | ||
d1010240 GP |
664 | bt_accept_enqueue(parent, sk); |
665 | ||
48454079 GP |
666 | __l2cap_chan_add(conn, chan); |
667 | ||
b62f328b VT |
668 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); |
669 | ||
670 | sk->sk_state = BT_CONNECTED; | |
671 | parent->sk_data_ready(parent, 0); | |
672 | ||
baa7e1fa | 673 | write_unlock_bh(&conn->chan_lock); |
b62f328b VT |
674 | |
675 | clean: | |
676 | bh_unlock_sock(parent); | |
677 | } | |
678 | ||
4e8402a3 MH |
679 | static void l2cap_conn_ready(struct l2cap_conn *conn) |
680 | { | |
48454079 | 681 | struct l2cap_chan *chan; |
4e8402a3 | 682 | |
79d554a6 | 683 | BT_DBG("conn %p", conn); |
4e8402a3 | 684 | |
b62f328b VT |
685 | if (!conn->hcon->out && conn->hcon->type == LE_LINK) |
686 | l2cap_le_conn_ready(conn); | |
687 | ||
baa7e1fa | 688 | read_lock(&conn->chan_lock); |
4e8402a3 | 689 | |
baa7e1fa | 690 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 691 | struct sock *sk = chan->sk; |
baa7e1fa | 692 | |
79d554a6 | 693 | bh_lock_sock(sk); |
4e8402a3 | 694 | |
acd7d370 VT |
695 | if (conn->hcon->type == LE_LINK) { |
696 | l2cap_sock_clear_timer(sk); | |
697 | sk->sk_state = BT_CONNECTED; | |
698 | sk->sk_state_change(sk); | |
699 | } | |
700 | ||
bd3c9e25 GP |
701 | if (sk->sk_type != SOCK_SEQPACKET && |
702 | sk->sk_type != SOCK_STREAM) { | |
79d554a6 MH |
703 | l2cap_sock_clear_timer(sk); |
704 | sk->sk_state = BT_CONNECTED; | |
705 | sk->sk_state_change(sk); | |
706 | } else if (sk->sk_state == BT_CONNECT) | |
fc7f8a7e | 707 | l2cap_do_start(chan); |
4e8402a3 | 708 | |
79d554a6 | 709 | bh_unlock_sock(sk); |
4e8402a3 | 710 | } |
79d554a6 | 711 | |
baa7e1fa | 712 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
713 | } |
714 | ||
715 | /* Notify sockets that we cannot guaranty reliability anymore */ | |
716 | static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) | |
717 | { | |
48454079 | 718 | struct l2cap_chan *chan; |
4e8402a3 MH |
719 | |
720 | BT_DBG("conn %p", conn); | |
721 | ||
baa7e1fa | 722 | read_lock(&conn->chan_lock); |
4e8402a3 | 723 | |
baa7e1fa | 724 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 725 | struct sock *sk = chan->sk; |
baa7e1fa | 726 | |
4343478f | 727 | if (chan->force_reliable) |
4e8402a3 MH |
728 | sk->sk_err = err; |
729 | } | |
730 | ||
baa7e1fa | 731 | read_unlock(&conn->chan_lock); |
4e8402a3 MH |
732 | } |
733 | ||
734 | static void l2cap_info_timeout(unsigned long arg) | |
735 | { | |
736 | struct l2cap_conn *conn = (void *) arg; | |
737 | ||
984947dc | 738 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 739 | conn->info_ident = 0; |
984947dc | 740 | |
4e8402a3 MH |
741 | l2cap_conn_start(conn); |
742 | } | |
743 | ||
1da177e4 LT |
744 | static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) |
745 | { | |
0139418c | 746 | struct l2cap_conn *conn = hcon->l2cap_data; |
1da177e4 | 747 | |
0139418c | 748 | if (conn || status) |
1da177e4 LT |
749 | return conn; |
750 | ||
0139418c MH |
751 | conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); |
752 | if (!conn) | |
1da177e4 | 753 | return NULL; |
1da177e4 LT |
754 | |
755 | hcon->l2cap_data = conn; | |
756 | conn->hcon = hcon; | |
757 | ||
0139418c MH |
758 | BT_DBG("hcon %p conn %p", hcon, conn); |
759 | ||
acd7d370 VT |
760 | if (hcon->hdev->le_mtu && hcon->type == LE_LINK) |
761 | conn->mtu = hcon->hdev->le_mtu; | |
762 | else | |
763 | conn->mtu = hcon->hdev->acl_mtu; | |
764 | ||
1da177e4 LT |
765 | conn->src = &hcon->hdev->bdaddr; |
766 | conn->dst = &hcon->dst; | |
767 | ||
4e8402a3 MH |
768 | conn->feat_mask = 0; |
769 | ||
1da177e4 | 770 | spin_lock_init(&conn->lock); |
baa7e1fa GP |
771 | rwlock_init(&conn->chan_lock); |
772 | ||
773 | INIT_LIST_HEAD(&conn->chan_l); | |
1da177e4 | 774 | |
b62f328b VT |
775 | if (hcon->type != LE_LINK) |
776 | setup_timer(&conn->info_timer, l2cap_info_timeout, | |
45054dc1 DY |
777 | (unsigned long) conn); |
778 | ||
2950f21a MH |
779 | conn->disc_reason = 0x13; |
780 | ||
1da177e4 LT |
781 | return conn; |
782 | } | |
783 | ||
0139418c | 784 | static void l2cap_conn_del(struct hci_conn *hcon, int err) |
1da177e4 | 785 | { |
0139418c | 786 | struct l2cap_conn *conn = hcon->l2cap_data; |
baa7e1fa | 787 | struct l2cap_chan *chan, *l; |
1da177e4 LT |
788 | struct sock *sk; |
789 | ||
0139418c MH |
790 | if (!conn) |
791 | return; | |
1da177e4 LT |
792 | |
793 | BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); | |
794 | ||
7585b97a | 795 | kfree_skb(conn->rx_skb); |
1da177e4 LT |
796 | |
797 | /* Kill channels */ | |
baa7e1fa | 798 | list_for_each_entry_safe(chan, l, &conn->chan_l, list) { |
48454079 | 799 | sk = chan->sk; |
1da177e4 | 800 | bh_lock_sock(sk); |
48454079 | 801 | l2cap_chan_del(chan, err); |
1da177e4 LT |
802 | bh_unlock_sock(sk); |
803 | l2cap_sock_kill(sk); | |
804 | } | |
805 | ||
8e8440f5 DY |
806 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) |
807 | del_timer_sync(&conn->info_timer); | |
3ab22731 | 808 | |
1da177e4 LT |
809 | hcon->l2cap_data = NULL; |
810 | kfree(conn); | |
1da177e4 LT |
811 | } |
812 | ||
48454079 | 813 | static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) |
1da177e4 | 814 | { |
baa7e1fa | 815 | write_lock_bh(&conn->chan_lock); |
48454079 | 816 | __l2cap_chan_add(conn, chan); |
baa7e1fa | 817 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
818 | } |
819 | ||
1da177e4 | 820 | /* ---- Socket interface ---- */ |
1da177e4 LT |
821 | |
822 | /* Find socket with psm and source bdaddr. | |
823 | * Returns closest match. | |
824 | */ | |
e0f0cb56 | 825 | static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) |
1da177e4 LT |
826 | { |
827 | struct sock *sk = NULL, *sk1 = NULL; | |
828 | struct hlist_node *node; | |
829 | ||
e0f0cb56 GP |
830 | read_lock(&l2cap_sk_list.lock); |
831 | ||
1da177e4 LT |
832 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
833 | if (state && sk->sk_state != state) | |
834 | continue; | |
835 | ||
836 | if (l2cap_pi(sk)->psm == psm) { | |
837 | /* Exact match. */ | |
838 | if (!bacmp(&bt_sk(sk)->src, src)) | |
839 | break; | |
840 | ||
841 | /* Closest match */ | |
842 | if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) | |
843 | sk1 = sk; | |
844 | } | |
845 | } | |
1da177e4 | 846 | |
1da177e4 | 847 | read_unlock(&l2cap_sk_list.lock); |
e0f0cb56 GP |
848 | |
849 | return node ? sk : sk1; | |
1da177e4 LT |
850 | } |
851 | ||
77a74c7e | 852 | int l2cap_chan_connect(struct l2cap_chan *chan) |
1da177e4 | 853 | { |
5d41ce1d | 854 | struct sock *sk = chan->sk; |
1da177e4 LT |
855 | bdaddr_t *src = &bt_sk(sk)->src; |
856 | bdaddr_t *dst = &bt_sk(sk)->dst; | |
857 | struct l2cap_conn *conn; | |
858 | struct hci_conn *hcon; | |
859 | struct hci_dev *hdev; | |
09ab6f4c | 860 | __u8 auth_type; |
44d0e48e | 861 | int err; |
1da177e4 | 862 | |
f29972de MH |
863 | BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), |
864 | l2cap_pi(sk)->psm); | |
1da177e4 | 865 | |
af05b30b GP |
866 | hdev = hci_get_route(dst, src); |
867 | if (!hdev) | |
1da177e4 LT |
868 | return -EHOSTUNREACH; |
869 | ||
870 | hci_dev_lock_bh(hdev); | |
871 | ||
4343478f | 872 | auth_type = l2cap_get_auth_type(chan); |
09ab6f4c | 873 | |
acd7d370 VT |
874 | if (l2cap_pi(sk)->dcid == L2CAP_CID_LE_DATA) |
875 | hcon = hci_connect(hdev, LE_LINK, dst, | |
4343478f | 876 | chan->sec_level, auth_type); |
acd7d370 VT |
877 | else |
878 | hcon = hci_connect(hdev, ACL_LINK, dst, | |
4343478f | 879 | chan->sec_level, auth_type); |
acd7d370 | 880 | |
30e76272 VT |
881 | if (IS_ERR(hcon)) { |
882 | err = PTR_ERR(hcon); | |
1da177e4 | 883 | goto done; |
30e76272 | 884 | } |
1da177e4 LT |
885 | |
886 | conn = l2cap_conn_add(hcon, 0); | |
887 | if (!conn) { | |
888 | hci_conn_put(hcon); | |
30e76272 | 889 | err = -ENOMEM; |
1da177e4 LT |
890 | goto done; |
891 | } | |
892 | ||
1da177e4 LT |
893 | /* Update source addr of the socket */ |
894 | bacpy(src, conn->src); | |
895 | ||
48454079 GP |
896 | l2cap_chan_add(conn, chan); |
897 | ||
1da177e4 LT |
898 | sk->sk_state = BT_CONNECT; |
899 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
900 | ||
901 | if (hcon->state == BT_CONNECTED) { | |
bd3c9e25 GP |
902 | if (sk->sk_type != SOCK_SEQPACKET && |
903 | sk->sk_type != SOCK_STREAM) { | |
1da177e4 | 904 | l2cap_sock_clear_timer(sk); |
4343478f | 905 | if (l2cap_check_security(chan)) |
d00ef24f | 906 | sk->sk_state = BT_CONNECTED; |
79d554a6 | 907 | } else |
fc7f8a7e | 908 | l2cap_do_start(chan); |
1da177e4 LT |
909 | } |
910 | ||
30e76272 VT |
911 | err = 0; |
912 | ||
1da177e4 LT |
913 | done: |
914 | hci_dev_unlock_bh(hdev); | |
915 | hci_dev_put(hdev); | |
916 | return err; | |
917 | } | |
918 | ||
dcba0dba | 919 | int __l2cap_wait_ack(struct sock *sk) |
6161c038 GP |
920 | { |
921 | DECLARE_WAITQUEUE(wait, current); | |
922 | int err = 0; | |
923 | int timeo = HZ/5; | |
924 | ||
2b0b05dd | 925 | add_wait_queue(sk_sleep(sk), &wait); |
6a026610 | 926 | while ((l2cap_pi(sk)->chan->unacked_frames > 0 && l2cap_pi(sk)->conn)) { |
6161c038 GP |
927 | set_current_state(TASK_INTERRUPTIBLE); |
928 | ||
929 | if (!timeo) | |
930 | timeo = HZ/5; | |
931 | ||
932 | if (signal_pending(current)) { | |
933 | err = sock_intr_errno(timeo); | |
934 | break; | |
935 | } | |
936 | ||
937 | release_sock(sk); | |
938 | timeo = schedule_timeout(timeo); | |
939 | lock_sock(sk); | |
940 | ||
941 | err = sock_error(sk); | |
942 | if (err) | |
943 | break; | |
944 | } | |
945 | set_current_state(TASK_RUNNING); | |
2b0b05dd | 946 | remove_wait_queue(sk_sleep(sk), &wait); |
6161c038 GP |
947 | return err; |
948 | } | |
949 | ||
e90bac06 GP |
950 | static void l2cap_monitor_timeout(unsigned long arg) |
951 | { | |
525cd185 GP |
952 | struct l2cap_chan *chan = (void *) arg; |
953 | struct sock *sk = chan->sk; | |
e90bac06 | 954 | |
525cd185 | 955 | BT_DBG("chan %p", chan); |
0e98958d | 956 | |
e686219a | 957 | bh_lock_sock(sk); |
2c03a7a4 | 958 | if (chan->retry_count >= chan->remote_max_tx) { |
e92c8e70 | 959 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, chan, ECONNABORTED); |
b13f5860 | 960 | bh_unlock_sock(sk); |
e90bac06 GP |
961 | return; |
962 | } | |
963 | ||
6a026610 | 964 | chan->retry_count++; |
e90bac06 GP |
965 | __mod_monitor_timer(); |
966 | ||
525cd185 | 967 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 968 | bh_unlock_sock(sk); |
e90bac06 GP |
969 | } |
970 | ||
971 | static void l2cap_retrans_timeout(unsigned long arg) | |
972 | { | |
525cd185 GP |
973 | struct l2cap_chan *chan = (void *) arg; |
974 | struct sock *sk = chan->sk; | |
e90bac06 | 975 | |
49208c9c | 976 | BT_DBG("chan %p", chan); |
0e98958d | 977 | |
e686219a | 978 | bh_lock_sock(sk); |
6a026610 | 979 | chan->retry_count = 1; |
e90bac06 GP |
980 | __mod_monitor_timer(); |
981 | ||
525cd185 | 982 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
e90bac06 | 983 | |
525cd185 | 984 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL); |
e686219a | 985 | bh_unlock_sock(sk); |
e90bac06 GP |
986 | } |
987 | ||
42e5c802 | 988 | static void l2cap_drop_acked_frames(struct l2cap_chan *chan) |
1da177e4 | 989 | { |
1c2acffb | 990 | struct sk_buff *skb; |
1da177e4 | 991 | |
58d35f87 | 992 | while ((skb = skb_peek(&chan->tx_q)) && |
6a026610 | 993 | chan->unacked_frames) { |
42e5c802 | 994 | if (bt_cb(skb)->tx_seq == chan->expected_ack_seq) |
1c2acffb | 995 | break; |
1da177e4 | 996 | |
58d35f87 | 997 | skb = skb_dequeue(&chan->tx_q); |
1c2acffb | 998 | kfree_skb(skb); |
1da177e4 | 999 | |
6a026610 | 1000 | chan->unacked_frames--; |
1c2acffb | 1001 | } |
1da177e4 | 1002 | |
6a026610 | 1003 | if (!chan->unacked_frames) |
e92c8e70 | 1004 | del_timer(&chan->retrans_timer); |
1c2acffb | 1005 | } |
1da177e4 | 1006 | |
4343478f | 1007 | void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb) |
1c2acffb | 1008 | { |
4343478f GP |
1009 | struct sock *sk = chan->sk; |
1010 | struct hci_conn *hcon = l2cap_pi(sk)->conn->hcon; | |
e702112f | 1011 | u16 flags; |
1c2acffb | 1012 | |
4343478f | 1013 | BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len); |
1da177e4 | 1014 | |
4343478f | 1015 | if (!chan->flushable && lmp_no_flush_capable(hcon->hdev)) |
e702112f AE |
1016 | flags = ACL_START_NO_FLUSH; |
1017 | else | |
1018 | flags = ACL_START; | |
1019 | ||
1020 | hci_send_acl(hcon, skb, flags); | |
1c2acffb GP |
1021 | } |
1022 | ||
42e5c802 | 1023 | void l2cap_streaming_send(struct l2cap_chan *chan) |
6840ed07 | 1024 | { |
ccbb84af | 1025 | struct sk_buff *skb; |
fcc203c3 | 1026 | u16 control, fcs; |
6840ed07 | 1027 | |
58d35f87 | 1028 | while ((skb = skb_dequeue(&chan->tx_q))) { |
ccbb84af | 1029 | control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE); |
42e5c802 | 1030 | control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; |
ccbb84af | 1031 | put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE); |
6840ed07 | 1032 | |
47d1ec61 | 1033 | if (chan->fcs == L2CAP_FCS_CRC16) { |
ccbb84af GP |
1034 | fcs = crc16(0, (u8 *)skb->data, skb->len - 2); |
1035 | put_unaligned_le16(fcs, skb->data + skb->len - 2); | |
fcc203c3 GP |
1036 | } |
1037 | ||
4343478f | 1038 | l2cap_do_send(chan, skb); |
6840ed07 | 1039 | |
42e5c802 | 1040 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; |
6840ed07 | 1041 | } |
6840ed07 GP |
1042 | } |
1043 | ||
525cd185 | 1044 | static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 1045 | { |
525cd185 | 1046 | struct sock *sk = chan->sk; |
8f17154f GP |
1047 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1048 | struct sk_buff *skb, *tx_skb; | |
1049 | u16 control, fcs; | |
8f17154f | 1050 | |
58d35f87 | 1051 | skb = skb_peek(&chan->tx_q); |
f11d676d GP |
1052 | if (!skb) |
1053 | return; | |
8f17154f | 1054 | |
f11d676d GP |
1055 | do { |
1056 | if (bt_cb(skb)->tx_seq == tx_seq) | |
8f17154f | 1057 | break; |
8f17154f | 1058 | |
58d35f87 | 1059 | if (skb_queue_is_last(&chan->tx_q, skb)) |
f11d676d | 1060 | return; |
8f17154f | 1061 | |
58d35f87 | 1062 | } while ((skb = skb_queue_next(&chan->tx_q, skb))); |
8f17154f | 1063 | |
2c03a7a4 GP |
1064 | if (chan->remote_max_tx && |
1065 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
e92c8e70 | 1066 | l2cap_send_disconn_req(pi->conn, chan, ECONNABORTED); |
f11d676d GP |
1067 | return; |
1068 | } | |
1069 | ||
1070 | tx_skb = skb_clone(skb, GFP_ATOMIC); | |
1071 | bt_cb(skb)->retries++; | |
1072 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); | |
a429b519 | 1073 | control &= L2CAP_CTRL_SAR; |
3cb123d1 | 1074 | |
525cd185 | 1075 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
3cb123d1 | 1076 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1077 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 1078 | } |
95ffa978 | 1079 | |
42e5c802 | 1080 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
f11d676d | 1081 | | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); |
3cb123d1 | 1082 | |
f11d676d GP |
1083 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1084 | ||
47d1ec61 | 1085 | if (chan->fcs == L2CAP_FCS_CRC16) { |
f11d676d GP |
1086 | fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); |
1087 | put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); | |
1088 | } | |
1089 | ||
4343478f | 1090 | l2cap_do_send(chan, tx_skb); |
8f17154f GP |
1091 | } |
1092 | ||
525cd185 | 1093 | int l2cap_ertm_send(struct l2cap_chan *chan) |
1c2acffb GP |
1094 | { |
1095 | struct sk_buff *skb, *tx_skb; | |
525cd185 | 1096 | struct sock *sk = chan->sk; |
1c2acffb | 1097 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
fcc203c3 | 1098 | u16 control, fcs; |
9a9c6a34 | 1099 | int nsent = 0; |
1c2acffb | 1100 | |
c13ffa62 GP |
1101 | if (sk->sk_state != BT_CONNECTED) |
1102 | return -ENOTCONN; | |
e90bac06 | 1103 | |
58d35f87 | 1104 | while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) { |
1c2acffb | 1105 | |
2c03a7a4 GP |
1106 | if (chan->remote_max_tx && |
1107 | bt_cb(skb)->retries == chan->remote_max_tx) { | |
e92c8e70 | 1108 | l2cap_send_disconn_req(pi->conn, chan, ECONNABORTED); |
e90bac06 GP |
1109 | break; |
1110 | } | |
1111 | ||
e420aba3 AE |
1112 | tx_skb = skb_clone(skb, GFP_ATOMIC); |
1113 | ||
e90bac06 GP |
1114 | bt_cb(skb)->retries++; |
1115 | ||
1c2acffb | 1116 | control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); |
95ffa978 GP |
1117 | control &= L2CAP_CTRL_SAR; |
1118 | ||
525cd185 | 1119 | if (chan->conn_state & L2CAP_CONN_SEND_FBIT) { |
d5392c8f | 1120 | control |= L2CAP_CTRL_FINAL; |
525cd185 | 1121 | chan->conn_state &= ~L2CAP_CONN_SEND_FBIT; |
d5392c8f | 1122 | } |
42e5c802 GP |
1123 | control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) |
1124 | | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); | |
1c2acffb GP |
1125 | put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); |
1126 | ||
e90bac06 | 1127 | |
47d1ec61 | 1128 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
1129 | fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); |
1130 | put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); | |
1131 | } | |
1132 | ||
4343478f | 1133 | l2cap_do_send(chan, tx_skb); |
9a9c6a34 | 1134 | |
e90bac06 | 1135 | __mod_retrans_timer(); |
1c2acffb | 1136 | |
42e5c802 GP |
1137 | bt_cb(skb)->tx_seq = chan->next_tx_seq; |
1138 | chan->next_tx_seq = (chan->next_tx_seq + 1) % 64; | |
1c2acffb | 1139 | |
23e9fde2 | 1140 | if (bt_cb(skb)->retries == 1) |
6a026610 | 1141 | chan->unacked_frames++; |
23e9fde2 | 1142 | |
6a026610 | 1143 | chan->frames_sent++; |
1c2acffb | 1144 | |
58d35f87 GP |
1145 | if (skb_queue_is_last(&chan->tx_q, skb)) |
1146 | chan->tx_send_head = NULL; | |
1c2acffb | 1147 | else |
58d35f87 | 1148 | chan->tx_send_head = skb_queue_next(&chan->tx_q, skb); |
9e917af1 GP |
1149 | |
1150 | nsent++; | |
1c2acffb GP |
1151 | } |
1152 | ||
9e917af1 GP |
1153 | return nsent; |
1154 | } | |
1155 | ||
525cd185 | 1156 | static int l2cap_retransmit_frames(struct l2cap_chan *chan) |
dfc909be | 1157 | { |
dfc909be GP |
1158 | int ret; |
1159 | ||
58d35f87 GP |
1160 | if (!skb_queue_empty(&chan->tx_q)) |
1161 | chan->tx_send_head = chan->tx_q.next; | |
dfc909be | 1162 | |
42e5c802 | 1163 | chan->next_tx_seq = chan->expected_ack_seq; |
525cd185 | 1164 | ret = l2cap_ertm_send(chan); |
dfc909be GP |
1165 | return ret; |
1166 | } | |
1167 | ||
525cd185 | 1168 | static void l2cap_send_ack(struct l2cap_chan *chan) |
9e917af1 | 1169 | { |
9e917af1 GP |
1170 | u16 control = 0; |
1171 | ||
42e5c802 | 1172 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
9e917af1 | 1173 | |
525cd185 | 1174 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
9e917af1 | 1175 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
1176 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1177 | l2cap_send_sframe(chan, control); | |
9a9c6a34 | 1178 | return; |
9e917af1 | 1179 | } |
dfc909be | 1180 | |
525cd185 | 1181 | if (l2cap_ertm_send(chan) > 0) |
dfc909be GP |
1182 | return; |
1183 | ||
1184 | control |= L2CAP_SUPER_RCV_READY; | |
525cd185 | 1185 | l2cap_send_sframe(chan, control); |
1c2acffb GP |
1186 | } |
1187 | ||
525cd185 | 1188 | static void l2cap_send_srejtail(struct l2cap_chan *chan) |
99b0d4b7 GP |
1189 | { |
1190 | struct srej_list *tail; | |
1191 | u16 control; | |
1192 | ||
1193 | control = L2CAP_SUPER_SELECT_REJECT; | |
1194 | control |= L2CAP_CTRL_FINAL; | |
1195 | ||
39d5a3ee | 1196 | tail = list_entry((&chan->srej_l)->prev, struct srej_list, list); |
99b0d4b7 GP |
1197 | control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1198 | ||
525cd185 | 1199 | l2cap_send_sframe(chan, control); |
99b0d4b7 GP |
1200 | } |
1201 | ||
1c2acffb GP |
1202 | static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) |
1203 | { | |
1204 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1205 | struct sk_buff **frag; | |
1206 | int err, sent = 0; | |
1da177e4 | 1207 | |
59203a21 | 1208 | if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) |
1c2acffb | 1209 | return -EFAULT; |
1da177e4 LT |
1210 | |
1211 | sent += count; | |
1212 | len -= count; | |
1213 | ||
1214 | /* Continuation fragments (no L2CAP header) */ | |
1215 | frag = &skb_shinfo(skb)->frag_list; | |
1216 | while (len) { | |
1217 | count = min_t(unsigned int, conn->mtu, len); | |
1218 | ||
1219 | *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); | |
1220 | if (!*frag) | |
0175d629 | 1221 | return err; |
1c2acffb GP |
1222 | if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) |
1223 | return -EFAULT; | |
1da177e4 LT |
1224 | |
1225 | sent += count; | |
1226 | len -= count; | |
1227 | ||
1228 | frag = &(*frag)->next; | |
1229 | } | |
1da177e4 LT |
1230 | |
1231 | return sent; | |
1c2acffb | 1232 | } |
1da177e4 | 1233 | |
fd83ccdb | 1234 | struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1235 | { |
1236 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1237 | struct sk_buff *skb; | |
1238 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1239 | struct l2cap_hdr *lh; | |
1240 | ||
1241 | BT_DBG("sk %p len %d", sk, (int)len); | |
1242 | ||
1243 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1244 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1245 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1246 | if (!skb) | |
0175d629 | 1247 | return ERR_PTR(err); |
1c2acffb GP |
1248 | |
1249 | /* Create L2CAP header */ | |
1250 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1251 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1252 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1253 | put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); | |
1254 | ||
1255 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1256 | if (unlikely(err < 0)) { | |
1257 | kfree_skb(skb); | |
1258 | return ERR_PTR(err); | |
1259 | } | |
1260 | return skb; | |
1261 | } | |
1262 | ||
fd83ccdb | 1263 | struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) |
1c2acffb GP |
1264 | { |
1265 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1266 | struct sk_buff *skb; | |
1267 | int err, count, hlen = L2CAP_HDR_SIZE; | |
1268 | struct l2cap_hdr *lh; | |
1269 | ||
1270 | BT_DBG("sk %p len %d", sk, (int)len); | |
1271 | ||
1272 | count = min_t(unsigned int, (conn->mtu - hlen), len); | |
1273 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1274 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1275 | if (!skb) | |
0175d629 | 1276 | return ERR_PTR(err); |
1c2acffb GP |
1277 | |
1278 | /* Create L2CAP header */ | |
1279 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1280 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1281 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1282 | ||
1283 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1284 | if (unlikely(err < 0)) { | |
1285 | kfree_skb(skb); | |
1286 | return ERR_PTR(err); | |
1287 | } | |
1288 | return skb; | |
1289 | } | |
1290 | ||
47d1ec61 | 1291 | struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen) |
1c2acffb | 1292 | { |
47d1ec61 | 1293 | struct sock *sk = chan->sk; |
1c2acffb GP |
1294 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; |
1295 | struct sk_buff *skb; | |
1296 | int err, count, hlen = L2CAP_HDR_SIZE + 2; | |
1297 | struct l2cap_hdr *lh; | |
1298 | ||
1299 | BT_DBG("sk %p len %d", sk, (int)len); | |
1300 | ||
0ee0d208 GP |
1301 | if (!conn) |
1302 | return ERR_PTR(-ENOTCONN); | |
1303 | ||
c74e560c GP |
1304 | if (sdulen) |
1305 | hlen += 2; | |
1306 | ||
47d1ec61 | 1307 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1308 | hlen += 2; |
1309 | ||
1c2acffb GP |
1310 | count = min_t(unsigned int, (conn->mtu - hlen), len); |
1311 | skb = bt_skb_send_alloc(sk, count + hlen, | |
1312 | msg->msg_flags & MSG_DONTWAIT, &err); | |
1313 | if (!skb) | |
0175d629 | 1314 | return ERR_PTR(err); |
1c2acffb GP |
1315 | |
1316 | /* Create L2CAP header */ | |
1317 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
1318 | lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1319 | lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); | |
1320 | put_unaligned_le16(control, skb_put(skb, 2)); | |
c74e560c GP |
1321 | if (sdulen) |
1322 | put_unaligned_le16(sdulen, skb_put(skb, 2)); | |
1c2acffb GP |
1323 | |
1324 | err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); | |
1325 | if (unlikely(err < 0)) { | |
1326 | kfree_skb(skb); | |
1327 | return ERR_PTR(err); | |
1328 | } | |
e90bac06 | 1329 | |
47d1ec61 | 1330 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
1331 | put_unaligned_le16(0, skb_put(skb, 2)); |
1332 | ||
e90bac06 | 1333 | bt_cb(skb)->retries = 0; |
1c2acffb | 1334 | return skb; |
1da177e4 LT |
1335 | } |
1336 | ||
2c03a7a4 | 1337 | int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len) |
c74e560c | 1338 | { |
c74e560c GP |
1339 | struct sk_buff *skb; |
1340 | struct sk_buff_head sar_queue; | |
1341 | u16 control; | |
1342 | size_t size = 0; | |
1343 | ||
ff12fd64 | 1344 | skb_queue_head_init(&sar_queue); |
c74e560c | 1345 | control = L2CAP_SDU_START; |
47d1ec61 | 1346 | skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len); |
c74e560c GP |
1347 | if (IS_ERR(skb)) |
1348 | return PTR_ERR(skb); | |
1349 | ||
1350 | __skb_queue_tail(&sar_queue, skb); | |
2c03a7a4 GP |
1351 | len -= chan->remote_mps; |
1352 | size += chan->remote_mps; | |
c74e560c GP |
1353 | |
1354 | while (len > 0) { | |
1355 | size_t buflen; | |
1356 | ||
2c03a7a4 | 1357 | if (len > chan->remote_mps) { |
44651b85 | 1358 | control = L2CAP_SDU_CONTINUE; |
2c03a7a4 | 1359 | buflen = chan->remote_mps; |
c74e560c | 1360 | } else { |
44651b85 | 1361 | control = L2CAP_SDU_END; |
c74e560c GP |
1362 | buflen = len; |
1363 | } | |
1364 | ||
47d1ec61 | 1365 | skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0); |
c74e560c GP |
1366 | if (IS_ERR(skb)) { |
1367 | skb_queue_purge(&sar_queue); | |
1368 | return PTR_ERR(skb); | |
1369 | } | |
1370 | ||
1371 | __skb_queue_tail(&sar_queue, skb); | |
1372 | len -= buflen; | |
1373 | size += buflen; | |
c74e560c | 1374 | } |
58d35f87 GP |
1375 | skb_queue_splice_tail(&sar_queue, &chan->tx_q); |
1376 | if (chan->tx_send_head == NULL) | |
1377 | chan->tx_send_head = sar_queue.next; | |
c74e560c GP |
1378 | |
1379 | return size; | |
1380 | } | |
1381 | ||
1da177e4 LT |
1382 | static void l2cap_chan_ready(struct sock *sk) |
1383 | { | |
1384 | struct sock *parent = bt_sk(sk)->parent; | |
b4450035 | 1385 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
1da177e4 LT |
1386 | |
1387 | BT_DBG("sk %p, parent %p", sk, parent); | |
1388 | ||
b4450035 | 1389 | chan->conf_state = 0; |
1da177e4 LT |
1390 | l2cap_sock_clear_timer(sk); |
1391 | ||
1392 | if (!parent) { | |
1393 | /* Outgoing channel. | |
1394 | * Wake up socket sleeping on connect. | |
1395 | */ | |
1396 | sk->sk_state = BT_CONNECTED; | |
1397 | sk->sk_state_change(sk); | |
1398 | } else { | |
1399 | /* Incoming channel. | |
1400 | * Wake up socket sleeping on accept. | |
1401 | */ | |
1402 | parent->sk_data_ready(parent, 0); | |
1403 | } | |
1404 | } | |
1405 | ||
1406 | /* Copy frame to all raw sockets on that connection */ | |
1407 | static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) | |
1408 | { | |
1da177e4 | 1409 | struct sk_buff *nskb; |
48454079 | 1410 | struct l2cap_chan *chan; |
1da177e4 LT |
1411 | |
1412 | BT_DBG("conn %p", conn); | |
1413 | ||
baa7e1fa GP |
1414 | read_lock(&conn->chan_lock); |
1415 | list_for_each_entry(chan, &conn->chan_l, list) { | |
48454079 | 1416 | struct sock *sk = chan->sk; |
1da177e4 LT |
1417 | if (sk->sk_type != SOCK_RAW) |
1418 | continue; | |
1419 | ||
1420 | /* Don't send frame to the socket it came from */ | |
1421 | if (skb->sk == sk) | |
1422 | continue; | |
af05b30b GP |
1423 | nskb = skb_clone(skb, GFP_ATOMIC); |
1424 | if (!nskb) | |
1da177e4 LT |
1425 | continue; |
1426 | ||
1427 | if (sock_queue_rcv_skb(sk, nskb)) | |
1428 | kfree_skb(nskb); | |
1429 | } | |
baa7e1fa | 1430 | read_unlock(&conn->chan_lock); |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | /* ---- L2CAP signalling commands ---- */ | |
1434 | static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, | |
1435 | u8 code, u8 ident, u16 dlen, void *data) | |
1436 | { | |
1437 | struct sk_buff *skb, **frag; | |
1438 | struct l2cap_cmd_hdr *cmd; | |
1439 | struct l2cap_hdr *lh; | |
1440 | int len, count; | |
1441 | ||
af05b30b GP |
1442 | BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", |
1443 | conn, code, ident, dlen); | |
1da177e4 LT |
1444 | |
1445 | len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; | |
1446 | count = min_t(unsigned int, conn->mtu, len); | |
1447 | ||
1448 | skb = bt_skb_alloc(count, GFP_ATOMIC); | |
1449 | if (!skb) | |
1450 | return NULL; | |
1451 | ||
1452 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
aca3192c | 1453 | lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); |
3300d9a9 CT |
1454 | |
1455 | if (conn->hcon->type == LE_LINK) | |
1456 | lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING); | |
1457 | else | |
1458 | lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); | |
1da177e4 LT |
1459 | |
1460 | cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); | |
1461 | cmd->code = code; | |
1462 | cmd->ident = ident; | |
aca3192c | 1463 | cmd->len = cpu_to_le16(dlen); |
1da177e4 LT |
1464 | |
1465 | if (dlen) { | |
1466 | count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; | |
1467 | memcpy(skb_put(skb, count), data, count); | |
1468 | data += count; | |
1469 | } | |
1470 | ||
1471 | len -= skb->len; | |
1472 | ||
1473 | /* Continuation fragments (no L2CAP header) */ | |
1474 | frag = &skb_shinfo(skb)->frag_list; | |
1475 | while (len) { | |
1476 | count = min_t(unsigned int, conn->mtu, len); | |
1477 | ||
1478 | *frag = bt_skb_alloc(count, GFP_ATOMIC); | |
1479 | if (!*frag) | |
1480 | goto fail; | |
1481 | ||
1482 | memcpy(skb_put(*frag, count), data, count); | |
1483 | ||
1484 | len -= count; | |
1485 | data += count; | |
1486 | ||
1487 | frag = &(*frag)->next; | |
1488 | } | |
1489 | ||
1490 | return skb; | |
1491 | ||
1492 | fail: | |
1493 | kfree_skb(skb); | |
1494 | return NULL; | |
1495 | } | |
1496 | ||
1497 | static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) | |
1498 | { | |
1499 | struct l2cap_conf_opt *opt = *ptr; | |
1500 | int len; | |
1501 | ||
1502 | len = L2CAP_CONF_OPT_SIZE + opt->len; | |
1503 | *ptr += len; | |
1504 | ||
1505 | *type = opt->type; | |
1506 | *olen = opt->len; | |
1507 | ||
1508 | switch (opt->len) { | |
1509 | case 1: | |
1510 | *val = *((u8 *) opt->val); | |
1511 | break; | |
1512 | ||
1513 | case 2: | |
bfaaeb3e | 1514 | *val = get_unaligned_le16(opt->val); |
1da177e4 LT |
1515 | break; |
1516 | ||
1517 | case 4: | |
bfaaeb3e | 1518 | *val = get_unaligned_le32(opt->val); |
1da177e4 LT |
1519 | break; |
1520 | ||
1521 | default: | |
1522 | *val = (unsigned long) opt->val; | |
1523 | break; | |
1524 | } | |
1525 | ||
1526 | BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); | |
1527 | return len; | |
1528 | } | |
1529 | ||
1da177e4 LT |
1530 | static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) |
1531 | { | |
1532 | struct l2cap_conf_opt *opt = *ptr; | |
1533 | ||
1534 | BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); | |
1535 | ||
1536 | opt->type = type; | |
1537 | opt->len = len; | |
1538 | ||
1539 | switch (len) { | |
1540 | case 1: | |
1541 | *((u8 *) opt->val) = val; | |
1542 | break; | |
1543 | ||
1544 | case 2: | |
4f8b691c | 1545 | put_unaligned_le16(val, opt->val); |
1da177e4 LT |
1546 | break; |
1547 | ||
1548 | case 4: | |
4f8b691c | 1549 | put_unaligned_le32(val, opt->val); |
1da177e4 LT |
1550 | break; |
1551 | ||
1552 | default: | |
1553 | memcpy(opt->val, (void *) val, len); | |
1554 | break; | |
1555 | } | |
1556 | ||
1557 | *ptr += L2CAP_CONF_OPT_SIZE + len; | |
1558 | } | |
1559 | ||
c1b4f43b GP |
1560 | static void l2cap_ack_timeout(unsigned long arg) |
1561 | { | |
525cd185 | 1562 | struct l2cap_chan *chan = (void *) arg; |
c1b4f43b | 1563 | |
525cd185 GP |
1564 | bh_lock_sock(chan->sk); |
1565 | l2cap_send_ack(chan); | |
1566 | bh_unlock_sock(chan->sk); | |
c1b4f43b GP |
1567 | } |
1568 | ||
525cd185 | 1569 | static inline void l2cap_ertm_init(struct l2cap_chan *chan) |
0565c1c2 | 1570 | { |
525cd185 GP |
1571 | struct sock *sk = chan->sk; |
1572 | ||
42e5c802 | 1573 | chan->expected_ack_seq = 0; |
6a026610 | 1574 | chan->unacked_frames = 0; |
42e5c802 | 1575 | chan->buffer_seq = 0; |
6a026610 GP |
1576 | chan->num_acked = 0; |
1577 | chan->frames_sent = 0; | |
0565c1c2 | 1578 | |
e92c8e70 GP |
1579 | setup_timer(&chan->retrans_timer, l2cap_retrans_timeout, |
1580 | (unsigned long) chan); | |
1581 | setup_timer(&chan->monitor_timer, l2cap_monitor_timeout, | |
1582 | (unsigned long) chan); | |
1583 | setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan); | |
0565c1c2 | 1584 | |
f1c6775b GP |
1585 | skb_queue_head_init(&chan->srej_q); |
1586 | skb_queue_head_init(&chan->busy_q); | |
1890d36b | 1587 | |
39d5a3ee GP |
1588 | INIT_LIST_HEAD(&chan->srej_l); |
1589 | ||
311bb895 | 1590 | INIT_WORK(&chan->busy_work, l2cap_busy_work); |
218bb9df GP |
1591 | |
1592 | sk->sk_backlog_rcv = l2cap_ertm_data_rcv; | |
0565c1c2 GP |
1593 | } |
1594 | ||
f2fcfcd6 GP |
1595 | static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) |
1596 | { | |
1597 | switch (mode) { | |
1598 | case L2CAP_MODE_STREAMING: | |
1599 | case L2CAP_MODE_ERTM: | |
1600 | if (l2cap_mode_supported(mode, remote_feat_mask)) | |
1601 | return mode; | |
1602 | /* fall through */ | |
1603 | default: | |
1604 | return L2CAP_MODE_BASIC; | |
1605 | } | |
1606 | } | |
1607 | ||
710f9b0a | 1608 | static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1609 | { |
49208c9c | 1610 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1da177e4 | 1611 | struct l2cap_conf_req *req = data; |
0c1bc5c6 | 1612 | struct l2cap_conf_rfc rfc = { .mode = chan->mode }; |
1da177e4 LT |
1613 | void *ptr = req->data; |
1614 | ||
49208c9c | 1615 | BT_DBG("chan %p", chan); |
1da177e4 | 1616 | |
73ffa904 | 1617 | if (chan->num_conf_req || chan->num_conf_rsp) |
f2fcfcd6 GP |
1618 | goto done; |
1619 | ||
0c1bc5c6 | 1620 | switch (chan->mode) { |
f2fcfcd6 GP |
1621 | case L2CAP_MODE_STREAMING: |
1622 | case L2CAP_MODE_ERTM: | |
b4450035 | 1623 | if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE) |
85eb53c6 | 1624 | break; |
85eb53c6 | 1625 | |
2ba13ed6 | 1626 | /* fall through */ |
f2fcfcd6 | 1627 | default: |
0c1bc5c6 | 1628 | chan->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); |
f2fcfcd6 GP |
1629 | break; |
1630 | } | |
1631 | ||
1632 | done: | |
0c1bc5c6 GP |
1633 | if (chan->imtu != L2CAP_DEFAULT_MTU) |
1634 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
7990681c | 1635 | |
0c1bc5c6 | 1636 | switch (chan->mode) { |
65c7c491 | 1637 | case L2CAP_MODE_BASIC: |
63406504 GP |
1638 | if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) && |
1639 | !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING)) | |
1640 | break; | |
1641 | ||
62547752 GP |
1642 | rfc.mode = L2CAP_MODE_BASIC; |
1643 | rfc.txwin_size = 0; | |
1644 | rfc.max_transmit = 0; | |
1645 | rfc.retrans_timeout = 0; | |
1646 | rfc.monitor_timeout = 0; | |
1647 | rfc.max_pdu_size = 0; | |
1648 | ||
63406504 GP |
1649 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1650 | (unsigned long) &rfc); | |
65c7c491 MH |
1651 | break; |
1652 | ||
1653 | case L2CAP_MODE_ERTM: | |
1654 | rfc.mode = L2CAP_MODE_ERTM; | |
47d1ec61 GP |
1655 | rfc.txwin_size = chan->tx_win; |
1656 | rfc.max_transmit = chan->max_tx; | |
f2fcfcd6 GP |
1657 | rfc.retrans_timeout = 0; |
1658 | rfc.monitor_timeout = 0; | |
c74e560c | 1659 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1660 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1661 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
f2fcfcd6 | 1662 | |
63406504 GP |
1663 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1664 | (unsigned long) &rfc); | |
1665 | ||
fcc203c3 GP |
1666 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1667 | break; | |
1668 | ||
47d1ec61 | 1669 | if (chan->fcs == L2CAP_FCS_NONE || |
b4450035 | 1670 | chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
47d1ec61 GP |
1671 | chan->fcs = L2CAP_FCS_NONE; |
1672 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1673 | } |
f2fcfcd6 GP |
1674 | break; |
1675 | ||
1676 | case L2CAP_MODE_STREAMING: | |
1677 | rfc.mode = L2CAP_MODE_STREAMING; | |
1678 | rfc.txwin_size = 0; | |
1679 | rfc.max_transmit = 0; | |
1680 | rfc.retrans_timeout = 0; | |
1681 | rfc.monitor_timeout = 0; | |
c74e560c | 1682 | rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); |
d1daa091 | 1683 | if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) |
1c762159 | 1684 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); |
65c7c491 | 1685 | |
63406504 GP |
1686 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), |
1687 | (unsigned long) &rfc); | |
1688 | ||
fcc203c3 GP |
1689 | if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) |
1690 | break; | |
1691 | ||
47d1ec61 | 1692 | if (chan->fcs == L2CAP_FCS_NONE || |
b4450035 | 1693 | chan->conf_state & L2CAP_CONF_NO_FCS_RECV) { |
47d1ec61 GP |
1694 | chan->fcs = L2CAP_FCS_NONE; |
1695 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs); | |
fcc203c3 | 1696 | } |
65c7c491 MH |
1697 | break; |
1698 | } | |
1da177e4 | 1699 | |
aca3192c YH |
1700 | req->dcid = cpu_to_le16(pi->dcid); |
1701 | req->flags = cpu_to_le16(0); | |
1da177e4 LT |
1702 | |
1703 | return ptr - data; | |
1704 | } | |
1705 | ||
73ffa904 | 1706 | static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data) |
1da177e4 | 1707 | { |
73ffa904 | 1708 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
5dee9e7c MH |
1709 | struct l2cap_conf_rsp *rsp = data; |
1710 | void *ptr = rsp->data; | |
73ffa904 GP |
1711 | void *req = chan->conf_req; |
1712 | int len = chan->conf_len; | |
5dee9e7c MH |
1713 | int type, hint, olen; |
1714 | unsigned long val; | |
6464f35f | 1715 | struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; |
861d6882 | 1716 | u16 mtu = L2CAP_DEFAULT_MTU; |
5dee9e7c | 1717 | u16 result = L2CAP_CONF_SUCCESS; |
1da177e4 | 1718 | |
73ffa904 | 1719 | BT_DBG("chan %p", chan); |
820ae1b8 | 1720 | |
5dee9e7c MH |
1721 | while (len >= L2CAP_CONF_OPT_SIZE) { |
1722 | len -= l2cap_get_conf_opt(&req, &type, &olen, &val); | |
1da177e4 | 1723 | |
589d2746 | 1724 | hint = type & L2CAP_CONF_HINT; |
47ec1dcd | 1725 | type &= L2CAP_CONF_MASK; |
5dee9e7c MH |
1726 | |
1727 | switch (type) { | |
1728 | case L2CAP_CONF_MTU: | |
861d6882 | 1729 | mtu = val; |
5dee9e7c MH |
1730 | break; |
1731 | ||
1732 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 1733 | chan->flush_to = val; |
5dee9e7c MH |
1734 | break; |
1735 | ||
1736 | case L2CAP_CONF_QOS: | |
1737 | break; | |
1738 | ||
6464f35f MH |
1739 | case L2CAP_CONF_RFC: |
1740 | if (olen == sizeof(rfc)) | |
1741 | memcpy(&rfc, (void *) val, olen); | |
1742 | break; | |
1743 | ||
fcc203c3 GP |
1744 | case L2CAP_CONF_FCS: |
1745 | if (val == L2CAP_FCS_NONE) | |
b4450035 | 1746 | chan->conf_state |= L2CAP_CONF_NO_FCS_RECV; |
fcc203c3 GP |
1747 | |
1748 | break; | |
1749 | ||
5dee9e7c MH |
1750 | default: |
1751 | if (hint) | |
1752 | break; | |
1753 | ||
1754 | result = L2CAP_CONF_UNKNOWN; | |
1755 | *((u8 *) ptr++) = type; | |
1756 | break; | |
1757 | } | |
1758 | } | |
1759 | ||
73ffa904 | 1760 | if (chan->num_conf_rsp || chan->num_conf_req > 1) |
f2fcfcd6 GP |
1761 | goto done; |
1762 | ||
0c1bc5c6 | 1763 | switch (chan->mode) { |
f2fcfcd6 GP |
1764 | case L2CAP_MODE_STREAMING: |
1765 | case L2CAP_MODE_ERTM: | |
b4450035 | 1766 | if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) { |
0c1bc5c6 | 1767 | chan->mode = l2cap_select_mode(rfc.mode, |
85eb53c6 GP |
1768 | pi->conn->feat_mask); |
1769 | break; | |
1770 | } | |
1771 | ||
0c1bc5c6 | 1772 | if (chan->mode != rfc.mode) |
f2fcfcd6 | 1773 | return -ECONNREFUSED; |
742e519b | 1774 | |
f2fcfcd6 | 1775 | break; |
f2fcfcd6 GP |
1776 | } |
1777 | ||
1778 | done: | |
0c1bc5c6 | 1779 | if (chan->mode != rfc.mode) { |
f2fcfcd6 | 1780 | result = L2CAP_CONF_UNACCEPT; |
0c1bc5c6 | 1781 | rfc.mode = chan->mode; |
f2fcfcd6 | 1782 | |
73ffa904 | 1783 | if (chan->num_conf_rsp == 1) |
f2fcfcd6 GP |
1784 | return -ECONNREFUSED; |
1785 | ||
1786 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1787 | sizeof(rfc), (unsigned long) &rfc); | |
1788 | } | |
1789 | ||
1790 | ||
5dee9e7c MH |
1791 | if (result == L2CAP_CONF_SUCCESS) { |
1792 | /* Configure output options and let the other side know | |
1793 | * which ones we don't like. */ | |
1794 | ||
f2fcfcd6 GP |
1795 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
1796 | result = L2CAP_CONF_UNACCEPT; | |
1797 | else { | |
0c1bc5c6 | 1798 | chan->omtu = mtu; |
b4450035 | 1799 | chan->conf_state |= L2CAP_CONF_MTU_DONE; |
f2fcfcd6 | 1800 | } |
0c1bc5c6 | 1801 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu); |
6464f35f | 1802 | |
f2fcfcd6 GP |
1803 | switch (rfc.mode) { |
1804 | case L2CAP_MODE_BASIC: | |
47d1ec61 | 1805 | chan->fcs = L2CAP_FCS_NONE; |
b4450035 | 1806 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
f2fcfcd6 GP |
1807 | break; |
1808 | ||
1809 | case L2CAP_MODE_ERTM: | |
2c03a7a4 GP |
1810 | chan->remote_tx_win = rfc.txwin_size; |
1811 | chan->remote_max_tx = rfc.max_transmit; | |
86b1b263 MM |
1812 | |
1813 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) | |
1814 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 | 1815 | |
2c03a7a4 | 1816 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 1817 | |
10467e9e GP |
1818 | rfc.retrans_timeout = |
1819 | le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); | |
1820 | rfc.monitor_timeout = | |
1821 | le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); | |
f2fcfcd6 | 1822 | |
b4450035 | 1823 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
68ae6639 GP |
1824 | |
1825 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1826 | sizeof(rfc), (unsigned long) &rfc); | |
1827 | ||
f2fcfcd6 GP |
1828 | break; |
1829 | ||
1830 | case L2CAP_MODE_STREAMING: | |
86b1b263 MM |
1831 | if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10) |
1832 | rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); | |
1c762159 | 1833 | |
2c03a7a4 | 1834 | chan->remote_mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 | 1835 | |
b4450035 | 1836 | chan->conf_state |= L2CAP_CONF_MODE_DONE; |
68ae6639 GP |
1837 | |
1838 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1839 | sizeof(rfc), (unsigned long) &rfc); | |
1840 | ||
f2fcfcd6 GP |
1841 | break; |
1842 | ||
1843 | default: | |
5dee9e7c | 1844 | result = L2CAP_CONF_UNACCEPT; |
5dee9e7c | 1845 | |
6464f35f | 1846 | memset(&rfc, 0, sizeof(rfc)); |
0c1bc5c6 | 1847 | rfc.mode = chan->mode; |
f2fcfcd6 | 1848 | } |
6464f35f | 1849 | |
f2fcfcd6 | 1850 | if (result == L2CAP_CONF_SUCCESS) |
b4450035 | 1851 | chan->conf_state |= L2CAP_CONF_OUTPUT_DONE; |
f2fcfcd6 | 1852 | } |
5dee9e7c MH |
1853 | rsp->scid = cpu_to_le16(pi->dcid); |
1854 | rsp->result = cpu_to_le16(result); | |
1855 | rsp->flags = cpu_to_le16(0x0000); | |
1856 | ||
1857 | return ptr - data; | |
1da177e4 LT |
1858 | } |
1859 | ||
b4450035 | 1860 | static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result) |
f2fcfcd6 | 1861 | { |
b4450035 | 1862 | struct sock *sk = chan->sk; |
f2fcfcd6 GP |
1863 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1864 | struct l2cap_conf_req *req = data; | |
1865 | void *ptr = req->data; | |
1866 | int type, olen; | |
1867 | unsigned long val; | |
1868 | struct l2cap_conf_rfc rfc; | |
1869 | ||
1870 | BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); | |
1871 | ||
1872 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1873 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1874 | ||
1875 | switch (type) { | |
1876 | case L2CAP_CONF_MTU: | |
1877 | if (val < L2CAP_DEFAULT_MIN_MTU) { | |
1878 | *result = L2CAP_CONF_UNACCEPT; | |
0c1bc5c6 | 1879 | chan->imtu = L2CAP_DEFAULT_MIN_MTU; |
f2fcfcd6 | 1880 | } else |
0c1bc5c6 GP |
1881 | chan->imtu = val; |
1882 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu); | |
f2fcfcd6 GP |
1883 | break; |
1884 | ||
1885 | case L2CAP_CONF_FLUSH_TO: | |
0c1bc5c6 | 1886 | chan->flush_to = val; |
f2fcfcd6 | 1887 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, |
0c1bc5c6 | 1888 | 2, chan->flush_to); |
f2fcfcd6 GP |
1889 | break; |
1890 | ||
1891 | case L2CAP_CONF_RFC: | |
1892 | if (olen == sizeof(rfc)) | |
1893 | memcpy(&rfc, (void *)val, olen); | |
1894 | ||
b4450035 | 1895 | if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) && |
0c1bc5c6 | 1896 | rfc.mode != chan->mode) |
f2fcfcd6 GP |
1897 | return -ECONNREFUSED; |
1898 | ||
47d1ec61 | 1899 | chan->fcs = 0; |
f2fcfcd6 GP |
1900 | |
1901 | l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, | |
1902 | sizeof(rfc), (unsigned long) &rfc); | |
1903 | break; | |
1904 | } | |
1905 | } | |
1906 | ||
0c1bc5c6 | 1907 | if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode) |
6c2ea7a8 GP |
1908 | return -ECONNREFUSED; |
1909 | ||
0c1bc5c6 | 1910 | chan->mode = rfc.mode; |
6c2ea7a8 | 1911 | |
f2fcfcd6 GP |
1912 | if (*result == L2CAP_CONF_SUCCESS) { |
1913 | switch (rfc.mode) { | |
1914 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
1915 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1916 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1917 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
f2fcfcd6 GP |
1918 | break; |
1919 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 1920 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
f2fcfcd6 GP |
1921 | } |
1922 | } | |
1923 | ||
1924 | req->dcid = cpu_to_le16(pi->dcid); | |
1925 | req->flags = cpu_to_le16(0x0000); | |
1926 | ||
1927 | return ptr - data; | |
1928 | } | |
1929 | ||
5dee9e7c | 1930 | static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) |
1da177e4 LT |
1931 | { |
1932 | struct l2cap_conf_rsp *rsp = data; | |
1933 | void *ptr = rsp->data; | |
1da177e4 | 1934 | |
5dee9e7c | 1935 | BT_DBG("sk %p", sk); |
1da177e4 | 1936 | |
aca3192c | 1937 | rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); |
5dee9e7c | 1938 | rsp->result = cpu_to_le16(result); |
aca3192c | 1939 | rsp->flags = cpu_to_le16(flags); |
1da177e4 LT |
1940 | |
1941 | return ptr - data; | |
1942 | } | |
1943 | ||
710f9b0a GP |
1944 | void __l2cap_connect_rsp_defer(struct sock *sk) |
1945 | { | |
1946 | struct l2cap_conn_rsp rsp; | |
1947 | struct l2cap_conn *conn = l2cap_pi(sk)->conn; | |
1948 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; | |
1949 | u8 buf[128]; | |
1950 | ||
1951 | sk->sk_state = BT_CONFIG; | |
1952 | ||
1953 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1954 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
1955 | rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); | |
1956 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); | |
1957 | l2cap_send_cmd(conn, chan->ident, | |
1958 | L2CAP_CONN_RSP, sizeof(rsp), &rsp); | |
1959 | ||
b4450035 | 1960 | if (chan->conf_state & L2CAP_CONF_REQ_SENT) |
710f9b0a GP |
1961 | return; |
1962 | ||
b4450035 | 1963 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
710f9b0a GP |
1964 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
1965 | l2cap_build_conf_req(chan, buf), buf); | |
1966 | chan->num_conf_req++; | |
1967 | } | |
1968 | ||
47d1ec61 | 1969 | static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len) |
7b1c0049 | 1970 | { |
7b1c0049 GP |
1971 | int type, olen; |
1972 | unsigned long val; | |
1973 | struct l2cap_conf_rfc rfc; | |
1974 | ||
47d1ec61 | 1975 | BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len); |
7b1c0049 | 1976 | |
0c1bc5c6 | 1977 | if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING)) |
7b1c0049 GP |
1978 | return; |
1979 | ||
1980 | while (len >= L2CAP_CONF_OPT_SIZE) { | |
1981 | len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); | |
1982 | ||
1983 | switch (type) { | |
1984 | case L2CAP_CONF_RFC: | |
1985 | if (olen == sizeof(rfc)) | |
1986 | memcpy(&rfc, (void *)val, olen); | |
1987 | goto done; | |
1988 | } | |
1989 | } | |
1990 | ||
1991 | done: | |
1992 | switch (rfc.mode) { | |
1993 | case L2CAP_MODE_ERTM: | |
47d1ec61 GP |
1994 | chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); |
1995 | chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); | |
1996 | chan->mps = le16_to_cpu(rfc.max_pdu_size); | |
7b1c0049 GP |
1997 | break; |
1998 | case L2CAP_MODE_STREAMING: | |
47d1ec61 | 1999 | chan->mps = le16_to_cpu(rfc.max_pdu_size); |
7b1c0049 GP |
2000 | } |
2001 | } | |
2002 | ||
4e8402a3 MH |
2003 | static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2004 | { | |
2005 | struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; | |
2006 | ||
2007 | if (rej->reason != 0x0000) | |
2008 | return 0; | |
2009 | ||
2010 | if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && | |
2011 | cmd->ident == conn->info_ident) { | |
4e8402a3 | 2012 | del_timer(&conn->info_timer); |
984947dc MH |
2013 | |
2014 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
e1027a7c | 2015 | conn->info_ident = 0; |
984947dc | 2016 | |
4e8402a3 MH |
2017 | l2cap_conn_start(conn); |
2018 | } | |
2019 | ||
2020 | return 0; | |
2021 | } | |
2022 | ||
1da177e4 LT |
2023 | static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) |
2024 | { | |
1da177e4 LT |
2025 | struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; |
2026 | struct l2cap_conn_rsp rsp; | |
73ffa904 | 2027 | struct l2cap_chan *chan = NULL; |
d793fe8c | 2028 | struct sock *parent, *sk = NULL; |
e7c29cb1 | 2029 | int result, status = L2CAP_CS_NO_INFO; |
1da177e4 LT |
2030 | |
2031 | u16 dcid = 0, scid = __le16_to_cpu(req->scid); | |
e7c29cb1 | 2032 | __le16 psm = req->psm; |
1da177e4 LT |
2033 | |
2034 | BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); | |
2035 | ||
2036 | /* Check if we have socket listening on psm */ | |
2037 | parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); | |
2038 | if (!parent) { | |
2039 | result = L2CAP_CR_BAD_PSM; | |
2040 | goto sendresp; | |
2041 | } | |
2042 | ||
e0f0cb56 GP |
2043 | bh_lock_sock(parent); |
2044 | ||
e7c29cb1 MH |
2045 | /* Check if the ACL is secure enough (if not SDP) */ |
2046 | if (psm != cpu_to_le16(0x0001) && | |
2047 | !hci_conn_check_link_mode(conn->hcon)) { | |
2950f21a | 2048 | conn->disc_reason = 0x05; |
e7c29cb1 MH |
2049 | result = L2CAP_CR_SEC_BLOCK; |
2050 | goto response; | |
2051 | } | |
2052 | ||
1da177e4 LT |
2053 | result = L2CAP_CR_NO_MEM; |
2054 | ||
2055 | /* Check for backlog size */ | |
2056 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 2057 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
2058 | goto response; |
2059 | } | |
2060 | ||
3b1e0a65 | 2061 | sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); |
1da177e4 LT |
2062 | if (!sk) |
2063 | goto response; | |
2064 | ||
48454079 GP |
2065 | chan = l2cap_chan_alloc(sk); |
2066 | if (!chan) { | |
2067 | l2cap_sock_kill(sk); | |
2068 | goto response; | |
2069 | } | |
2070 | ||
5d41ce1d GP |
2071 | l2cap_pi(sk)->chan = chan; |
2072 | ||
baa7e1fa | 2073 | write_lock_bh(&conn->chan_lock); |
1da177e4 LT |
2074 | |
2075 | /* Check if we already have channel with that dcid */ | |
baa7e1fa GP |
2076 | if (__l2cap_get_chan_by_dcid(conn, scid)) { |
2077 | write_unlock_bh(&conn->chan_lock); | |
1da177e4 LT |
2078 | sock_set_flag(sk, SOCK_ZAPPED); |
2079 | l2cap_sock_kill(sk); | |
2080 | goto response; | |
2081 | } | |
2082 | ||
2083 | hci_conn_hold(conn->hcon); | |
2084 | ||
2085 | l2cap_sock_init(sk, parent); | |
2086 | bacpy(&bt_sk(sk)->src, conn->src); | |
2087 | bacpy(&bt_sk(sk)->dst, conn->dst); | |
2088 | l2cap_pi(sk)->psm = psm; | |
2089 | l2cap_pi(sk)->dcid = scid; | |
2090 | ||
d1010240 GP |
2091 | bt_accept_enqueue(parent, sk); |
2092 | ||
48454079 GP |
2093 | __l2cap_chan_add(conn, chan); |
2094 | ||
1da177e4 LT |
2095 | dcid = l2cap_pi(sk)->scid; |
2096 | ||
2097 | l2cap_sock_set_timer(sk, sk->sk_sndtimeo); | |
2098 | ||
fc7f8a7e | 2099 | chan->ident = cmd->ident; |
1da177e4 | 2100 | |
984947dc | 2101 | if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { |
4343478f | 2102 | if (l2cap_check_security(chan)) { |
f66dc81f MH |
2103 | if (bt_sk(sk)->defer_setup) { |
2104 | sk->sk_state = BT_CONNECT2; | |
2105 | result = L2CAP_CR_PEND; | |
2106 | status = L2CAP_CS_AUTHOR_PEND; | |
2107 | parent->sk_data_ready(parent, 0); | |
2108 | } else { | |
2109 | sk->sk_state = BT_CONFIG; | |
2110 | result = L2CAP_CR_SUCCESS; | |
2111 | status = L2CAP_CS_NO_INFO; | |
2112 | } | |
79d554a6 MH |
2113 | } else { |
2114 | sk->sk_state = BT_CONNECT2; | |
2115 | result = L2CAP_CR_PEND; | |
2116 | status = L2CAP_CS_AUTHEN_PEND; | |
2117 | } | |
2118 | } else { | |
2119 | sk->sk_state = BT_CONNECT2; | |
2120 | result = L2CAP_CR_PEND; | |
2121 | status = L2CAP_CS_NO_INFO; | |
1da177e4 LT |
2122 | } |
2123 | ||
baa7e1fa | 2124 | write_unlock_bh(&conn->chan_lock); |
1da177e4 LT |
2125 | |
2126 | response: | |
2127 | bh_unlock_sock(parent); | |
2128 | ||
2129 | sendresp: | |
aca3192c YH |
2130 | rsp.scid = cpu_to_le16(scid); |
2131 | rsp.dcid = cpu_to_le16(dcid); | |
2132 | rsp.result = cpu_to_le16(result); | |
2133 | rsp.status = cpu_to_le16(status); | |
1da177e4 | 2134 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); |
79d554a6 MH |
2135 | |
2136 | if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { | |
2137 | struct l2cap_info_req info; | |
2138 | info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2139 | ||
2140 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; | |
2141 | conn->info_ident = l2cap_get_ident(conn); | |
2142 | ||
2143 | mod_timer(&conn->info_timer, jiffies + | |
2144 | msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); | |
2145 | ||
2146 | l2cap_send_cmd(conn, conn->info_ident, | |
2147 | L2CAP_INFO_REQ, sizeof(info), &info); | |
2148 | } | |
2149 | ||
b4450035 | 2150 | if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) && |
e9aeb2dd GP |
2151 | result == L2CAP_CR_SUCCESS) { |
2152 | u8 buf[128]; | |
b4450035 | 2153 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 2154 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2155 | l2cap_build_conf_req(chan, buf), buf); |
2156 | chan->num_conf_req++; | |
e9aeb2dd GP |
2157 | } |
2158 | ||
1da177e4 LT |
2159 | return 0; |
2160 | } | |
2161 | ||
2162 | static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2163 | { | |
2164 | struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; | |
2165 | u16 scid, dcid, result, status; | |
48454079 | 2166 | struct l2cap_chan *chan; |
1da177e4 LT |
2167 | struct sock *sk; |
2168 | u8 req[128]; | |
2169 | ||
2170 | scid = __le16_to_cpu(rsp->scid); | |
2171 | dcid = __le16_to_cpu(rsp->dcid); | |
2172 | result = __le16_to_cpu(rsp->result); | |
2173 | status = __le16_to_cpu(rsp->status); | |
2174 | ||
2175 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); | |
2176 | ||
2177 | if (scid) { | |
baa7e1fa | 2178 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2179 | if (!chan) |
57d3b22b | 2180 | return -EFAULT; |
1da177e4 | 2181 | } else { |
baa7e1fa | 2182 | chan = l2cap_get_chan_by_ident(conn, cmd->ident); |
48454079 | 2183 | if (!chan) |
57d3b22b | 2184 | return -EFAULT; |
1da177e4 LT |
2185 | } |
2186 | ||
48454079 GP |
2187 | sk = chan->sk; |
2188 | ||
1da177e4 LT |
2189 | switch (result) { |
2190 | case L2CAP_CR_SUCCESS: | |
2191 | sk->sk_state = BT_CONFIG; | |
fc7f8a7e | 2192 | chan->ident = 0; |
1da177e4 | 2193 | l2cap_pi(sk)->dcid = dcid; |
b4450035 | 2194 | chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND; |
6a8d3010 | 2195 | |
b4450035 | 2196 | if (chan->conf_state & L2CAP_CONF_REQ_SENT) |
e9aeb2dd GP |
2197 | break; |
2198 | ||
b4450035 | 2199 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
e9aeb2dd | 2200 | |
1da177e4 | 2201 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2202 | l2cap_build_conf_req(chan, req), req); |
2203 | chan->num_conf_req++; | |
1da177e4 LT |
2204 | break; |
2205 | ||
2206 | case L2CAP_CR_PEND: | |
b4450035 | 2207 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 LT |
2208 | break; |
2209 | ||
2210 | default: | |
a49184c2 AE |
2211 | /* don't delete l2cap channel if sk is owned by user */ |
2212 | if (sock_owned_by_user(sk)) { | |
2213 | sk->sk_state = BT_DISCONN; | |
2214 | l2cap_sock_clear_timer(sk); | |
2215 | l2cap_sock_set_timer(sk, HZ / 5); | |
2216 | break; | |
2217 | } | |
2218 | ||
48454079 | 2219 | l2cap_chan_del(chan, ECONNREFUSED); |
1da177e4 LT |
2220 | break; |
2221 | } | |
2222 | ||
2223 | bh_unlock_sock(sk); | |
2224 | return 0; | |
2225 | } | |
2226 | ||
47d1ec61 | 2227 | static inline void set_default_fcs(struct l2cap_chan *chan) |
8c462b60 | 2228 | { |
47d1ec61 GP |
2229 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
2230 | ||
8c462b60 MM |
2231 | /* FCS is enabled only in ERTM or streaming mode, if one or both |
2232 | * sides request it. | |
2233 | */ | |
0c1bc5c6 | 2234 | if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING) |
47d1ec61 | 2235 | chan->fcs = L2CAP_FCS_NONE; |
b4450035 | 2236 | else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV)) |
47d1ec61 | 2237 | chan->fcs = L2CAP_FCS_CRC16; |
8c462b60 MM |
2238 | } |
2239 | ||
88219a0f | 2240 | static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) |
1da177e4 LT |
2241 | { |
2242 | struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; | |
2243 | u16 dcid, flags; | |
2244 | u8 rsp[64]; | |
48454079 | 2245 | struct l2cap_chan *chan; |
1da177e4 | 2246 | struct sock *sk; |
5dee9e7c | 2247 | int len; |
1da177e4 LT |
2248 | |
2249 | dcid = __le16_to_cpu(req->dcid); | |
2250 | flags = __le16_to_cpu(req->flags); | |
2251 | ||
2252 | BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); | |
2253 | ||
baa7e1fa | 2254 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2255 | if (!chan) |
1da177e4 LT |
2256 | return -ENOENT; |
2257 | ||
48454079 GP |
2258 | sk = chan->sk; |
2259 | ||
df6bd743 GP |
2260 | if (sk->sk_state != BT_CONFIG) { |
2261 | struct l2cap_cmd_rej rej; | |
2262 | ||
2263 | rej.reason = cpu_to_le16(0x0002); | |
2264 | l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, | |
2265 | sizeof(rej), &rej); | |
354f60a9 | 2266 | goto unlock; |
df6bd743 | 2267 | } |
354f60a9 | 2268 | |
5dee9e7c | 2269 | /* Reject if config buffer is too small. */ |
88219a0f | 2270 | len = cmd_len - sizeof(*req); |
73ffa904 | 2271 | if (chan->conf_len + len > sizeof(chan->conf_req)) { |
5dee9e7c MH |
2272 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, |
2273 | l2cap_build_conf_rsp(sk, rsp, | |
2274 | L2CAP_CONF_REJECT, flags), rsp); | |
2275 | goto unlock; | |
2276 | } | |
2277 | ||
2278 | /* Store config. */ | |
73ffa904 GP |
2279 | memcpy(chan->conf_req + chan->conf_len, req->data, len); |
2280 | chan->conf_len += len; | |
1da177e4 LT |
2281 | |
2282 | if (flags & 0x0001) { | |
2283 | /* Incomplete config. Send empty response. */ | |
2284 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, | |
5dee9e7c MH |
2285 | l2cap_build_conf_rsp(sk, rsp, |
2286 | L2CAP_CONF_SUCCESS, 0x0001), rsp); | |
1da177e4 LT |
2287 | goto unlock; |
2288 | } | |
2289 | ||
2290 | /* Complete config. */ | |
73ffa904 | 2291 | len = l2cap_parse_conf_req(chan, rsp); |
f2fcfcd6 | 2292 | if (len < 0) { |
e92c8e70 | 2293 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 | 2294 | goto unlock; |
f2fcfcd6 | 2295 | } |
1da177e4 | 2296 | |
5dee9e7c | 2297 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); |
73ffa904 | 2298 | chan->num_conf_rsp++; |
5dee9e7c | 2299 | |
5dee9e7c | 2300 | /* Reset config buffer. */ |
73ffa904 | 2301 | chan->conf_len = 0; |
5dee9e7c | 2302 | |
b4450035 | 2303 | if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE)) |
876d9484 MH |
2304 | goto unlock; |
2305 | ||
b4450035 | 2306 | if (chan->conf_state & L2CAP_CONF_INPUT_DONE) { |
47d1ec61 | 2307 | set_default_fcs(chan); |
fcc203c3 | 2308 | |
1da177e4 | 2309 | sk->sk_state = BT_CONNECTED; |
e90bac06 | 2310 | |
42e5c802 GP |
2311 | chan->next_tx_seq = 0; |
2312 | chan->expected_tx_seq = 0; | |
58d35f87 | 2313 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2314 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2315 | l2cap_ertm_init(chan); |
0565c1c2 | 2316 | |
1da177e4 | 2317 | l2cap_chan_ready(sk); |
876d9484 MH |
2318 | goto unlock; |
2319 | } | |
2320 | ||
b4450035 | 2321 | if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) { |
79d554a6 | 2322 | u8 buf[64]; |
b4450035 | 2323 | chan->conf_state |= L2CAP_CONF_REQ_SENT; |
1da177e4 | 2324 | l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, |
73ffa904 GP |
2325 | l2cap_build_conf_req(chan, buf), buf); |
2326 | chan->num_conf_req++; | |
1da177e4 LT |
2327 | } |
2328 | ||
2329 | unlock: | |
2330 | bh_unlock_sock(sk); | |
2331 | return 0; | |
2332 | } | |
2333 | ||
2334 | static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2335 | { | |
2336 | struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; | |
2337 | u16 scid, flags, result; | |
48454079 | 2338 | struct l2cap_chan *chan; |
1da177e4 | 2339 | struct sock *sk; |
7b1c0049 | 2340 | int len = cmd->len - sizeof(*rsp); |
1da177e4 LT |
2341 | |
2342 | scid = __le16_to_cpu(rsp->scid); | |
2343 | flags = __le16_to_cpu(rsp->flags); | |
2344 | result = __le16_to_cpu(rsp->result); | |
2345 | ||
af05b30b GP |
2346 | BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", |
2347 | scid, flags, result); | |
1da177e4 | 2348 | |
baa7e1fa | 2349 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2350 | if (!chan) |
1da177e4 LT |
2351 | return 0; |
2352 | ||
48454079 GP |
2353 | sk = chan->sk; |
2354 | ||
1da177e4 LT |
2355 | switch (result) { |
2356 | case L2CAP_CONF_SUCCESS: | |
47d1ec61 | 2357 | l2cap_conf_rfc_get(chan, rsp->data, len); |
1da177e4 LT |
2358 | break; |
2359 | ||
2360 | case L2CAP_CONF_UNACCEPT: | |
73ffa904 | 2361 | if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { |
f2fcfcd6 GP |
2362 | char req[64]; |
2363 | ||
c2c77ec8 | 2364 | if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { |
e92c8e70 | 2365 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
c2c77ec8 AE |
2366 | goto done; |
2367 | } | |
2368 | ||
f2fcfcd6 GP |
2369 | /* throw out any old stored conf requests */ |
2370 | result = L2CAP_CONF_SUCCESS; | |
b4450035 GP |
2371 | len = l2cap_parse_conf_rsp(chan, rsp->data, len, |
2372 | req, &result); | |
f2fcfcd6 | 2373 | if (len < 0) { |
e92c8e70 | 2374 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
f2fcfcd6 GP |
2375 | goto done; |
2376 | } | |
2377 | ||
2378 | l2cap_send_cmd(conn, l2cap_get_ident(conn), | |
2379 | L2CAP_CONF_REQ, len, req); | |
73ffa904 | 2380 | chan->num_conf_req++; |
f2fcfcd6 GP |
2381 | if (result != L2CAP_CONF_SUCCESS) |
2382 | goto done; | |
2383 | break; | |
1da177e4 LT |
2384 | } |
2385 | ||
8e87d142 | 2386 | default: |
b1235d79 | 2387 | sk->sk_err = ECONNRESET; |
1da177e4 | 2388 | l2cap_sock_set_timer(sk, HZ * 5); |
e92c8e70 | 2389 | l2cap_send_disconn_req(conn, chan, ECONNRESET); |
1da177e4 LT |
2390 | goto done; |
2391 | } | |
2392 | ||
2393 | if (flags & 0x01) | |
2394 | goto done; | |
2395 | ||
b4450035 | 2396 | chan->conf_state |= L2CAP_CONF_INPUT_DONE; |
1da177e4 | 2397 | |
b4450035 | 2398 | if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) { |
47d1ec61 | 2399 | set_default_fcs(chan); |
fcc203c3 | 2400 | |
1da177e4 | 2401 | sk->sk_state = BT_CONNECTED; |
42e5c802 GP |
2402 | chan->next_tx_seq = 0; |
2403 | chan->expected_tx_seq = 0; | |
58d35f87 | 2404 | skb_queue_head_init(&chan->tx_q); |
0c1bc5c6 | 2405 | if (chan->mode == L2CAP_MODE_ERTM) |
525cd185 | 2406 | l2cap_ertm_init(chan); |
0565c1c2 | 2407 | |
1da177e4 LT |
2408 | l2cap_chan_ready(sk); |
2409 | } | |
2410 | ||
2411 | done: | |
2412 | bh_unlock_sock(sk); | |
2413 | return 0; | |
2414 | } | |
2415 | ||
2416 | static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2417 | { | |
2418 | struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; | |
2419 | struct l2cap_disconn_rsp rsp; | |
2420 | u16 dcid, scid; | |
48454079 | 2421 | struct l2cap_chan *chan; |
1da177e4 LT |
2422 | struct sock *sk; |
2423 | ||
2424 | scid = __le16_to_cpu(req->scid); | |
2425 | dcid = __le16_to_cpu(req->dcid); | |
2426 | ||
2427 | BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); | |
2428 | ||
baa7e1fa | 2429 | chan = l2cap_get_chan_by_scid(conn, dcid); |
48454079 | 2430 | if (!chan) |
1da177e4 LT |
2431 | return 0; |
2432 | ||
48454079 GP |
2433 | sk = chan->sk; |
2434 | ||
aca3192c YH |
2435 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); |
2436 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
1da177e4 LT |
2437 | l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); |
2438 | ||
2439 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2440 | ||
a49184c2 AE |
2441 | /* don't delete l2cap channel if sk is owned by user */ |
2442 | if (sock_owned_by_user(sk)) { | |
2443 | sk->sk_state = BT_DISCONN; | |
2444 | l2cap_sock_clear_timer(sk); | |
2445 | l2cap_sock_set_timer(sk, HZ / 5); | |
2446 | bh_unlock_sock(sk); | |
2447 | return 0; | |
2448 | } | |
2449 | ||
48454079 | 2450 | l2cap_chan_del(chan, ECONNRESET); |
1da177e4 LT |
2451 | bh_unlock_sock(sk); |
2452 | ||
2453 | l2cap_sock_kill(sk); | |
2454 | return 0; | |
2455 | } | |
2456 | ||
2457 | static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2458 | { | |
2459 | struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; | |
2460 | u16 dcid, scid; | |
48454079 | 2461 | struct l2cap_chan *chan; |
1da177e4 LT |
2462 | struct sock *sk; |
2463 | ||
2464 | scid = __le16_to_cpu(rsp->scid); | |
2465 | dcid = __le16_to_cpu(rsp->dcid); | |
2466 | ||
2467 | BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); | |
2468 | ||
baa7e1fa | 2469 | chan = l2cap_get_chan_by_scid(conn, scid); |
48454079 | 2470 | if (!chan) |
1da177e4 LT |
2471 | return 0; |
2472 | ||
48454079 GP |
2473 | sk = chan->sk; |
2474 | ||
a49184c2 AE |
2475 | /* don't delete l2cap channel if sk is owned by user */ |
2476 | if (sock_owned_by_user(sk)) { | |
2477 | sk->sk_state = BT_DISCONN; | |
2478 | l2cap_sock_clear_timer(sk); | |
2479 | l2cap_sock_set_timer(sk, HZ / 5); | |
2480 | bh_unlock_sock(sk); | |
2481 | return 0; | |
2482 | } | |
2483 | ||
48454079 | 2484 | l2cap_chan_del(chan, 0); |
1da177e4 LT |
2485 | bh_unlock_sock(sk); |
2486 | ||
2487 | l2cap_sock_kill(sk); | |
2488 | return 0; | |
2489 | } | |
2490 | ||
2491 | static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2492 | { | |
2493 | struct l2cap_info_req *req = (struct l2cap_info_req *) data; | |
1da177e4 LT |
2494 | u16 type; |
2495 | ||
2496 | type = __le16_to_cpu(req->type); | |
2497 | ||
2498 | BT_DBG("type 0x%4.4x", type); | |
2499 | ||
f0709e03 MH |
2500 | if (type == L2CAP_IT_FEAT_MASK) { |
2501 | u8 buf[8]; | |
44dd46de | 2502 | u32 feat_mask = l2cap_feat_mask; |
f0709e03 MH |
2503 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; |
2504 | rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); | |
2505 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
d1c4a17d | 2506 | if (!disable_ertm) |
fcc203c3 GP |
2507 | feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING |
2508 | | L2CAP_FEAT_FCS; | |
1b7bf4ed | 2509 | put_unaligned_le32(feat_mask, rsp->data); |
f0709e03 MH |
2510 | l2cap_send_cmd(conn, cmd->ident, |
2511 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
e1027a7c MH |
2512 | } else if (type == L2CAP_IT_FIXED_CHAN) { |
2513 | u8 buf[12]; | |
2514 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; | |
2515 | rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2516 | rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); | |
2517 | memcpy(buf + 4, l2cap_fixed_chan, 8); | |
2518 | l2cap_send_cmd(conn, cmd->ident, | |
2519 | L2CAP_INFO_RSP, sizeof(buf), buf); | |
f0709e03 MH |
2520 | } else { |
2521 | struct l2cap_info_rsp rsp; | |
2522 | rsp.type = cpu_to_le16(type); | |
2523 | rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); | |
2524 | l2cap_send_cmd(conn, cmd->ident, | |
2525 | L2CAP_INFO_RSP, sizeof(rsp), &rsp); | |
2526 | } | |
1da177e4 LT |
2527 | |
2528 | return 0; | |
2529 | } | |
2530 | ||
2531 | static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) | |
2532 | { | |
2533 | struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; | |
2534 | u16 type, result; | |
2535 | ||
2536 | type = __le16_to_cpu(rsp->type); | |
2537 | result = __le16_to_cpu(rsp->result); | |
2538 | ||
2539 | BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); | |
2540 | ||
e90165be AE |
2541 | /* L2CAP Info req/rsp are unbound to channels, add extra checks */ |
2542 | if (cmd->ident != conn->info_ident || | |
2543 | conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) | |
2544 | return 0; | |
2545 | ||
4e8402a3 MH |
2546 | del_timer(&conn->info_timer); |
2547 | ||
adb08ede VT |
2548 | if (result != L2CAP_IR_SUCCESS) { |
2549 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2550 | conn->info_ident = 0; | |
2551 | ||
2552 | l2cap_conn_start(conn); | |
2553 | ||
2554 | return 0; | |
2555 | } | |
2556 | ||
984947dc | 2557 | if (type == L2CAP_IT_FEAT_MASK) { |
83985319 | 2558 | conn->feat_mask = get_unaligned_le32(rsp->data); |
4e8402a3 | 2559 | |
47ec1dcd | 2560 | if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { |
e1027a7c MH |
2561 | struct l2cap_info_req req; |
2562 | req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); | |
2563 | ||
2564 | conn->info_ident = l2cap_get_ident(conn); | |
2565 | ||
2566 | l2cap_send_cmd(conn, conn->info_ident, | |
2567 | L2CAP_INFO_REQ, sizeof(req), &req); | |
2568 | } else { | |
2569 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; | |
2570 | conn->info_ident = 0; | |
2571 | ||
2572 | l2cap_conn_start(conn); | |
2573 | } | |
2574 | } else if (type == L2CAP_IT_FIXED_CHAN) { | |
984947dc | 2575 | conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; |
e1027a7c | 2576 | conn->info_ident = 0; |
984947dc MH |
2577 | |
2578 | l2cap_conn_start(conn); | |
2579 | } | |
4e8402a3 | 2580 | |
1da177e4 LT |
2581 | return 0; |
2582 | } | |
2583 | ||
e2174ca4 | 2584 | static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency, |
de73115a CT |
2585 | u16 to_multiplier) |
2586 | { | |
2587 | u16 max_latency; | |
2588 | ||
2589 | if (min > max || min < 6 || max > 3200) | |
2590 | return -EINVAL; | |
2591 | ||
2592 | if (to_multiplier < 10 || to_multiplier > 3200) | |
2593 | return -EINVAL; | |
2594 | ||
2595 | if (max >= to_multiplier * 8) | |
2596 | return -EINVAL; | |
2597 | ||
2598 | max_latency = (to_multiplier * 8 / max) - 1; | |
2599 | if (latency > 499 || latency > max_latency) | |
2600 | return -EINVAL; | |
2601 | ||
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn, | |
2606 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2607 | { | |
2608 | struct hci_conn *hcon = conn->hcon; | |
2609 | struct l2cap_conn_param_update_req *req; | |
2610 | struct l2cap_conn_param_update_rsp rsp; | |
2611 | u16 min, max, latency, to_multiplier, cmd_len; | |
2ce603eb | 2612 | int err; |
de73115a CT |
2613 | |
2614 | if (!(hcon->link_mode & HCI_LM_MASTER)) | |
2615 | return -EINVAL; | |
2616 | ||
2617 | cmd_len = __le16_to_cpu(cmd->len); | |
2618 | if (cmd_len != sizeof(struct l2cap_conn_param_update_req)) | |
2619 | return -EPROTO; | |
2620 | ||
2621 | req = (struct l2cap_conn_param_update_req *) data; | |
e2174ca4 GP |
2622 | min = __le16_to_cpu(req->min); |
2623 | max = __le16_to_cpu(req->max); | |
de73115a CT |
2624 | latency = __le16_to_cpu(req->latency); |
2625 | to_multiplier = __le16_to_cpu(req->to_multiplier); | |
2626 | ||
2627 | BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x", | |
2628 | min, max, latency, to_multiplier); | |
2629 | ||
2630 | memset(&rsp, 0, sizeof(rsp)); | |
2ce603eb CT |
2631 | |
2632 | err = l2cap_check_conn_param(min, max, latency, to_multiplier); | |
2633 | if (err) | |
de73115a CT |
2634 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED); |
2635 | else | |
2636 | rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED); | |
2637 | ||
2638 | l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP, | |
2639 | sizeof(rsp), &rsp); | |
2640 | ||
2ce603eb CT |
2641 | if (!err) |
2642 | hci_le_conn_update(hcon, min, max, latency, to_multiplier); | |
2643 | ||
de73115a CT |
2644 | return 0; |
2645 | } | |
2646 | ||
3300d9a9 CT |
2647 | static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn, |
2648 | struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) | |
2649 | { | |
2650 | int err = 0; | |
2651 | ||
2652 | switch (cmd->code) { | |
2653 | case L2CAP_COMMAND_REJ: | |
2654 | l2cap_command_rej(conn, cmd, data); | |
2655 | break; | |
2656 | ||
2657 | case L2CAP_CONN_REQ: | |
2658 | err = l2cap_connect_req(conn, cmd, data); | |
2659 | break; | |
2660 | ||
2661 | case L2CAP_CONN_RSP: | |
2662 | err = l2cap_connect_rsp(conn, cmd, data); | |
2663 | break; | |
2664 | ||
2665 | case L2CAP_CONF_REQ: | |
2666 | err = l2cap_config_req(conn, cmd, cmd_len, data); | |
2667 | break; | |
2668 | ||
2669 | case L2CAP_CONF_RSP: | |
2670 | err = l2cap_config_rsp(conn, cmd, data); | |
2671 | break; | |
2672 | ||
2673 | case L2CAP_DISCONN_REQ: | |
2674 | err = l2cap_disconnect_req(conn, cmd, data); | |
2675 | break; | |
2676 | ||
2677 | case L2CAP_DISCONN_RSP: | |
2678 | err = l2cap_disconnect_rsp(conn, cmd, data); | |
2679 | break; | |
2680 | ||
2681 | case L2CAP_ECHO_REQ: | |
2682 | l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data); | |
2683 | break; | |
2684 | ||
2685 | case L2CAP_ECHO_RSP: | |
2686 | break; | |
2687 | ||
2688 | case L2CAP_INFO_REQ: | |
2689 | err = l2cap_information_req(conn, cmd, data); | |
2690 | break; | |
2691 | ||
2692 | case L2CAP_INFO_RSP: | |
2693 | err = l2cap_information_rsp(conn, cmd, data); | |
2694 | break; | |
2695 | ||
2696 | default: | |
2697 | BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code); | |
2698 | err = -EINVAL; | |
2699 | break; | |
2700 | } | |
2701 | ||
2702 | return err; | |
2703 | } | |
2704 | ||
2705 | static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn, | |
2706 | struct l2cap_cmd_hdr *cmd, u8 *data) | |
2707 | { | |
2708 | switch (cmd->code) { | |
2709 | case L2CAP_COMMAND_REJ: | |
2710 | return 0; | |
2711 | ||
2712 | case L2CAP_CONN_PARAM_UPDATE_REQ: | |
de73115a | 2713 | return l2cap_conn_param_update_req(conn, cmd, data); |
3300d9a9 CT |
2714 | |
2715 | case L2CAP_CONN_PARAM_UPDATE_RSP: | |
2716 | return 0; | |
2717 | ||
2718 | default: | |
2719 | BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code); | |
2720 | return -EINVAL; | |
2721 | } | |
2722 | } | |
2723 | ||
2724 | static inline void l2cap_sig_channel(struct l2cap_conn *conn, | |
2725 | struct sk_buff *skb) | |
1da177e4 LT |
2726 | { |
2727 | u8 *data = skb->data; | |
2728 | int len = skb->len; | |
2729 | struct l2cap_cmd_hdr cmd; | |
3300d9a9 | 2730 | int err; |
1da177e4 LT |
2731 | |
2732 | l2cap_raw_recv(conn, skb); | |
2733 | ||
2734 | while (len >= L2CAP_CMD_HDR_SIZE) { | |
88219a0f | 2735 | u16 cmd_len; |
1da177e4 LT |
2736 | memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); |
2737 | data += L2CAP_CMD_HDR_SIZE; | |
2738 | len -= L2CAP_CMD_HDR_SIZE; | |
2739 | ||
88219a0f | 2740 | cmd_len = le16_to_cpu(cmd.len); |
1da177e4 | 2741 | |
88219a0f | 2742 | BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); |
1da177e4 | 2743 | |
88219a0f | 2744 | if (cmd_len > len || !cmd.ident) { |
1da177e4 LT |
2745 | BT_DBG("corrupted command"); |
2746 | break; | |
2747 | } | |
2748 | ||
3300d9a9 CT |
2749 | if (conn->hcon->type == LE_LINK) |
2750 | err = l2cap_le_sig_cmd(conn, &cmd, data); | |
2751 | else | |
2752 | err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data); | |
1da177e4 LT |
2753 | |
2754 | if (err) { | |
2755 | struct l2cap_cmd_rej rej; | |
2c6d1a2e GP |
2756 | |
2757 | BT_ERR("Wrong link type (%d)", err); | |
1da177e4 LT |
2758 | |
2759 | /* FIXME: Map err to a valid reason */ | |
aca3192c | 2760 | rej.reason = cpu_to_le16(0); |
1da177e4 LT |
2761 | l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); |
2762 | } | |
2763 | ||
88219a0f AV |
2764 | data += cmd_len; |
2765 | len -= cmd_len; | |
1da177e4 LT |
2766 | } |
2767 | ||
2768 | kfree_skb(skb); | |
2769 | } | |
2770 | ||
47d1ec61 | 2771 | static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb) |
fcc203c3 GP |
2772 | { |
2773 | u16 our_fcs, rcv_fcs; | |
2774 | int hdr_size = L2CAP_HDR_SIZE + 2; | |
2775 | ||
47d1ec61 | 2776 | if (chan->fcs == L2CAP_FCS_CRC16) { |
fcc203c3 GP |
2777 | skb_trim(skb, skb->len - 2); |
2778 | rcv_fcs = get_unaligned_le16(skb->data + skb->len); | |
2779 | our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); | |
2780 | ||
2781 | if (our_fcs != rcv_fcs) | |
7a560e5c | 2782 | return -EBADMSG; |
fcc203c3 GP |
2783 | } |
2784 | return 0; | |
2785 | } | |
2786 | ||
525cd185 | 2787 | static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan) |
d5392c8f | 2788 | { |
d5392c8f GP |
2789 | u16 control = 0; |
2790 | ||
6a026610 | 2791 | chan->frames_sent = 0; |
d5392c8f | 2792 | |
42e5c802 | 2793 | control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
d5392c8f | 2794 | |
525cd185 | 2795 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
64988868 | 2796 | control |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 GP |
2797 | l2cap_send_sframe(chan, control); |
2798 | chan->conn_state |= L2CAP_CONN_RNR_SENT; | |
d5392c8f GP |
2799 | } |
2800 | ||
525cd185 GP |
2801 | if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY) |
2802 | l2cap_retransmit_frames(chan); | |
d5392c8f | 2803 | |
525cd185 | 2804 | l2cap_ertm_send(chan); |
d5392c8f | 2805 | |
525cd185 | 2806 | if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) && |
6a026610 | 2807 | chan->frames_sent == 0) { |
d5392c8f | 2808 | control |= L2CAP_SUPER_RCV_READY; |
525cd185 | 2809 | l2cap_send_sframe(chan, control); |
d5392c8f GP |
2810 | } |
2811 | } | |
2812 | ||
42e5c802 | 2813 | static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar) |
8f17154f GP |
2814 | { |
2815 | struct sk_buff *next_skb; | |
bfbacc11 | 2816 | int tx_seq_offset, next_tx_seq_offset; |
8f17154f GP |
2817 | |
2818 | bt_cb(skb)->tx_seq = tx_seq; | |
2819 | bt_cb(skb)->sar = sar; | |
2820 | ||
f1c6775b | 2821 | next_skb = skb_peek(&chan->srej_q); |
8f17154f | 2822 | if (!next_skb) { |
f1c6775b | 2823 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d | 2824 | return 0; |
8f17154f GP |
2825 | } |
2826 | ||
42e5c802 | 2827 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2828 | if (tx_seq_offset < 0) |
2829 | tx_seq_offset += 64; | |
2830 | ||
8f17154f | 2831 | do { |
9b53350d JPRV |
2832 | if (bt_cb(next_skb)->tx_seq == tx_seq) |
2833 | return -EINVAL; | |
2834 | ||
bfbacc11 | 2835 | next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - |
42e5c802 | 2836 | chan->buffer_seq) % 64; |
bfbacc11 JPRV |
2837 | if (next_tx_seq_offset < 0) |
2838 | next_tx_seq_offset += 64; | |
2839 | ||
2840 | if (next_tx_seq_offset > tx_seq_offset) { | |
f1c6775b | 2841 | __skb_queue_before(&chan->srej_q, next_skb, skb); |
9b53350d | 2842 | return 0; |
8f17154f GP |
2843 | } |
2844 | ||
f1c6775b | 2845 | if (skb_queue_is_last(&chan->srej_q, next_skb)) |
8f17154f GP |
2846 | break; |
2847 | ||
f1c6775b | 2848 | } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb))); |
8f17154f | 2849 | |
f1c6775b | 2850 | __skb_queue_tail(&chan->srej_q, skb); |
9b53350d JPRV |
2851 | |
2852 | return 0; | |
8f17154f GP |
2853 | } |
2854 | ||
525cd185 | 2855 | static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
18778a63 | 2856 | { |
525cd185 | 2857 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
18778a63 | 2858 | struct sk_buff *_skb; |
1890d36b | 2859 | int err; |
18778a63 GP |
2860 | |
2861 | switch (control & L2CAP_CTRL_SAR) { | |
2862 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 2863 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2864 | goto drop; |
2865 | ||
525cd185 | 2866 | err = sock_queue_rcv_skb(chan->sk, skb); |
18778a63 GP |
2867 | if (!err) |
2868 | return err; | |
2869 | ||
2870 | break; | |
2871 | ||
2872 | case L2CAP_SDU_START: | |
525cd185 | 2873 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) |
18778a63 GP |
2874 | goto drop; |
2875 | ||
6f61fd47 | 2876 | chan->sdu_len = get_unaligned_le16(skb->data); |
18778a63 | 2877 | |
0c1bc5c6 | 2878 | if (chan->sdu_len > chan->imtu) |
18778a63 GP |
2879 | goto disconnect; |
2880 | ||
6f61fd47 GP |
2881 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
2882 | if (!chan->sdu) | |
1890d36b GP |
2883 | return -ENOMEM; |
2884 | ||
2885 | /* pull sdu_len bytes only after alloc, because of Local Busy | |
2886 | * condition we have to be sure that this will be executed | |
2887 | * only once, i.e., when alloc does not fail */ | |
2888 | skb_pull(skb, 2); | |
18778a63 | 2889 | |
6f61fd47 | 2890 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
18778a63 | 2891 | |
525cd185 | 2892 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 2893 | chan->partial_sdu_len = skb->len; |
18778a63 GP |
2894 | break; |
2895 | ||
2896 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 2897 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2898 | goto disconnect; |
2899 | ||
6f61fd47 | 2900 | if (!chan->sdu) |
18778a63 GP |
2901 | goto disconnect; |
2902 | ||
6f61fd47 GP |
2903 | chan->partial_sdu_len += skb->len; |
2904 | if (chan->partial_sdu_len > chan->sdu_len) | |
18778a63 GP |
2905 | goto drop; |
2906 | ||
6f61fd47 | 2907 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
4178ba46 | 2908 | |
18778a63 GP |
2909 | break; |
2910 | ||
2911 | case L2CAP_SDU_END: | |
525cd185 | 2912 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
18778a63 GP |
2913 | goto disconnect; |
2914 | ||
6f61fd47 | 2915 | if (!chan->sdu) |
18778a63 GP |
2916 | goto disconnect; |
2917 | ||
525cd185 | 2918 | if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) { |
6f61fd47 | 2919 | chan->partial_sdu_len += skb->len; |
18778a63 | 2920 | |
0c1bc5c6 | 2921 | if (chan->partial_sdu_len > chan->imtu) |
1890d36b | 2922 | goto drop; |
18778a63 | 2923 | |
6f61fd47 | 2924 | if (chan->partial_sdu_len != chan->sdu_len) |
1890d36b | 2925 | goto drop; |
4178ba46 | 2926 | |
6f61fd47 | 2927 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
1890d36b | 2928 | } |
18778a63 | 2929 | |
6f61fd47 | 2930 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); |
1890d36b | 2931 | if (!_skb) { |
525cd185 | 2932 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
2933 | return -ENOMEM; |
2934 | } | |
2935 | ||
525cd185 | 2936 | err = sock_queue_rcv_skb(chan->sk, _skb); |
1890d36b | 2937 | if (err < 0) { |
18778a63 | 2938 | kfree_skb(_skb); |
525cd185 | 2939 | chan->conn_state |= L2CAP_CONN_SAR_RETRY; |
1890d36b GP |
2940 | return err; |
2941 | } | |
2942 | ||
525cd185 GP |
2943 | chan->conn_state &= ~L2CAP_CONN_SAR_RETRY; |
2944 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; | |
18778a63 | 2945 | |
6f61fd47 | 2946 | kfree_skb(chan->sdu); |
18778a63 GP |
2947 | break; |
2948 | } | |
2949 | ||
2950 | kfree_skb(skb); | |
1890d36b | 2951 | return 0; |
18778a63 GP |
2952 | |
2953 | drop: | |
6f61fd47 GP |
2954 | kfree_skb(chan->sdu); |
2955 | chan->sdu = NULL; | |
18778a63 GP |
2956 | |
2957 | disconnect: | |
e92c8e70 | 2958 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
18778a63 GP |
2959 | kfree_skb(skb); |
2960 | return 0; | |
2961 | } | |
2962 | ||
525cd185 | 2963 | static int l2cap_try_push_rx_skb(struct l2cap_chan *chan) |
712132eb | 2964 | { |
712132eb GP |
2965 | struct sk_buff *skb; |
2966 | u16 control; | |
2967 | int err; | |
2968 | ||
f1c6775b | 2969 | while ((skb = skb_dequeue(&chan->busy_q))) { |
712132eb | 2970 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 2971 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
712132eb | 2972 | if (err < 0) { |
f1c6775b | 2973 | skb_queue_head(&chan->busy_q, skb); |
712132eb GP |
2974 | return -EBUSY; |
2975 | } | |
2976 | ||
42e5c802 | 2977 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
712132eb GP |
2978 | } |
2979 | ||
525cd185 | 2980 | if (!(chan->conn_state & L2CAP_CONN_RNR_SENT)) |
712132eb GP |
2981 | goto done; |
2982 | ||
42e5c802 | 2983 | control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
712132eb | 2984 | control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; |
525cd185 | 2985 | l2cap_send_sframe(chan, control); |
6a026610 | 2986 | chan->retry_count = 1; |
712132eb | 2987 | |
e92c8e70 | 2988 | del_timer(&chan->retrans_timer); |
712132eb GP |
2989 | __mod_monitor_timer(); |
2990 | ||
525cd185 | 2991 | chan->conn_state |= L2CAP_CONN_WAIT_F; |
712132eb GP |
2992 | |
2993 | done: | |
525cd185 GP |
2994 | chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; |
2995 | chan->conn_state &= ~L2CAP_CONN_RNR_SENT; | |
712132eb | 2996 | |
49208c9c | 2997 | BT_DBG("chan %p, Exit local busy", chan); |
712132eb GP |
2998 | |
2999 | return 0; | |
3000 | } | |
3001 | ||
1890d36b GP |
3002 | static void l2cap_busy_work(struct work_struct *work) |
3003 | { | |
3004 | DECLARE_WAITQUEUE(wait, current); | |
311bb895 GP |
3005 | struct l2cap_chan *chan = |
3006 | container_of(work, struct l2cap_chan, busy_work); | |
3007 | struct sock *sk = chan->sk; | |
1890d36b GP |
3008 | int n_tries = 0, timeo = HZ/5, err; |
3009 | struct sk_buff *skb; | |
1890d36b GP |
3010 | |
3011 | lock_sock(sk); | |
3012 | ||
2b0b05dd | 3013 | add_wait_queue(sk_sleep(sk), &wait); |
311bb895 | 3014 | while ((skb = skb_peek(&chan->busy_q))) { |
1890d36b GP |
3015 | set_current_state(TASK_INTERRUPTIBLE); |
3016 | ||
3017 | if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { | |
3018 | err = -EBUSY; | |
311bb895 | 3019 | l2cap_send_disconn_req(l2cap_pi(sk)->conn, chan, EBUSY); |
712132eb | 3020 | break; |
1890d36b GP |
3021 | } |
3022 | ||
3023 | if (!timeo) | |
3024 | timeo = HZ/5; | |
3025 | ||
3026 | if (signal_pending(current)) { | |
3027 | err = sock_intr_errno(timeo); | |
712132eb | 3028 | break; |
1890d36b GP |
3029 | } |
3030 | ||
3031 | release_sock(sk); | |
3032 | timeo = schedule_timeout(timeo); | |
3033 | lock_sock(sk); | |
3034 | ||
3035 | err = sock_error(sk); | |
3036 | if (err) | |
712132eb | 3037 | break; |
1890d36b | 3038 | |
311bb895 | 3039 | if (l2cap_try_push_rx_skb(chan) == 0) |
1890d36b GP |
3040 | break; |
3041 | } | |
3042 | ||
1890d36b | 3043 | set_current_state(TASK_RUNNING); |
2b0b05dd | 3044 | remove_wait_queue(sk_sleep(sk), &wait); |
1890d36b GP |
3045 | |
3046 | release_sock(sk); | |
3047 | } | |
3048 | ||
525cd185 | 3049 | static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
1890d36b | 3050 | { |
1890d36b GP |
3051 | int sctrl, err; |
3052 | ||
525cd185 | 3053 | if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) { |
1890d36b | 3054 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3055 | __skb_queue_tail(&chan->busy_q, skb); |
525cd185 | 3056 | return l2cap_try_push_rx_skb(chan); |
712132eb GP |
3057 | |
3058 | ||
1890d36b GP |
3059 | } |
3060 | ||
525cd185 | 3061 | err = l2cap_ertm_reassembly_sdu(chan, skb, control); |
1890d36b | 3062 | if (err >= 0) { |
42e5c802 | 3063 | chan->buffer_seq = (chan->buffer_seq + 1) % 64; |
1890d36b GP |
3064 | return err; |
3065 | } | |
3066 | ||
3067 | /* Busy Condition */ | |
311bb895 | 3068 | BT_DBG("chan %p, Enter local busy", chan); |
0e98958d | 3069 | |
525cd185 | 3070 | chan->conn_state |= L2CAP_CONN_LOCAL_BUSY; |
1890d36b | 3071 | bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; |
f1c6775b | 3072 | __skb_queue_tail(&chan->busy_q, skb); |
1890d36b | 3073 | |
42e5c802 | 3074 | sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
1890d36b | 3075 | sctrl |= L2CAP_SUPER_RCV_NOT_READY; |
525cd185 | 3076 | l2cap_send_sframe(chan, sctrl); |
1890d36b | 3077 | |
525cd185 | 3078 | chan->conn_state |= L2CAP_CONN_RNR_SENT; |
1890d36b | 3079 | |
e92c8e70 | 3080 | del_timer(&chan->ack_timer); |
7fe9b298 | 3081 | |
311bb895 | 3082 | queue_work(_busy_wq, &chan->busy_work); |
1890d36b GP |
3083 | |
3084 | return err; | |
3085 | } | |
3086 | ||
525cd185 | 3087 | static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control) |
c74e560c | 3088 | { |
c74e560c GP |
3089 | struct sk_buff *_skb; |
3090 | int err = -EINVAL; | |
3091 | ||
18778a63 GP |
3092 | /* |
3093 | * TODO: We have to notify the userland if some data is lost with the | |
3094 | * Streaming Mode. | |
3095 | */ | |
3096 | ||
c74e560c GP |
3097 | switch (control & L2CAP_CTRL_SAR) { |
3098 | case L2CAP_SDU_UNSEGMENTED: | |
525cd185 | 3099 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3100 | kfree_skb(chan->sdu); |
c74e560c GP |
3101 | break; |
3102 | } | |
3103 | ||
525cd185 | 3104 | err = sock_queue_rcv_skb(chan->sk, skb); |
c74e560c GP |
3105 | if (!err) |
3106 | return 0; | |
3107 | ||
3108 | break; | |
3109 | ||
3110 | case L2CAP_SDU_START: | |
525cd185 | 3111 | if (chan->conn_state & L2CAP_CONN_SAR_SDU) { |
6f61fd47 | 3112 | kfree_skb(chan->sdu); |
c74e560c GP |
3113 | break; |
3114 | } | |
3115 | ||
6f61fd47 | 3116 | chan->sdu_len = get_unaligned_le16(skb->data); |
c74e560c GP |
3117 | skb_pull(skb, 2); |
3118 | ||
0c1bc5c6 | 3119 | if (chan->sdu_len > chan->imtu) { |
052897ca GP |
3120 | err = -EMSGSIZE; |
3121 | break; | |
3122 | } | |
3123 | ||
6f61fd47 GP |
3124 | chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC); |
3125 | if (!chan->sdu) { | |
c74e560c GP |
3126 | err = -ENOMEM; |
3127 | break; | |
3128 | } | |
3129 | ||
6f61fd47 | 3130 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3131 | |
525cd185 | 3132 | chan->conn_state |= L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3133 | chan->partial_sdu_len = skb->len; |
c74e560c GP |
3134 | err = 0; |
3135 | break; | |
3136 | ||
3137 | case L2CAP_SDU_CONTINUE: | |
525cd185 | 3138 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3139 | break; |
3140 | ||
6f61fd47 | 3141 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3142 | |
6f61fd47 GP |
3143 | chan->partial_sdu_len += skb->len; |
3144 | if (chan->partial_sdu_len > chan->sdu_len) | |
3145 | kfree_skb(chan->sdu); | |
c74e560c GP |
3146 | else |
3147 | err = 0; | |
3148 | ||
3149 | break; | |
3150 | ||
3151 | case L2CAP_SDU_END: | |
525cd185 | 3152 | if (!(chan->conn_state & L2CAP_CONN_SAR_SDU)) |
c74e560c GP |
3153 | break; |
3154 | ||
6f61fd47 | 3155 | memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len); |
c74e560c | 3156 | |
525cd185 | 3157 | chan->conn_state &= ~L2CAP_CONN_SAR_SDU; |
6f61fd47 | 3158 | chan->partial_sdu_len += skb->len; |
c74e560c | 3159 | |
0c1bc5c6 | 3160 | if (chan->partial_sdu_len > chan->imtu) |
36f2fd58 GP |
3161 | goto drop; |
3162 | ||
6f61fd47 GP |
3163 | if (chan->partial_sdu_len == chan->sdu_len) { |
3164 | _skb = skb_clone(chan->sdu, GFP_ATOMIC); | |
525cd185 | 3165 | err = sock_queue_rcv_skb(chan->sk, _skb); |
c74e560c GP |
3166 | if (err < 0) |
3167 | kfree_skb(_skb); | |
3168 | } | |
c74e560c GP |
3169 | err = 0; |
3170 | ||
36f2fd58 | 3171 | drop: |
6f61fd47 | 3172 | kfree_skb(chan->sdu); |
c74e560c GP |
3173 | break; |
3174 | } | |
3175 | ||
3176 | kfree_skb(skb); | |
3177 | return err; | |
3178 | } | |
3179 | ||
525cd185 | 3180 | static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f GP |
3181 | { |
3182 | struct sk_buff *skb; | |
afefdbc4 | 3183 | u16 control; |
8f17154f | 3184 | |
f1c6775b | 3185 | while ((skb = skb_peek(&chan->srej_q))) { |
8f17154f GP |
3186 | if (bt_cb(skb)->tx_seq != tx_seq) |
3187 | break; | |
3188 | ||
f1c6775b | 3189 | skb = skb_dequeue(&chan->srej_q); |
afefdbc4 | 3190 | control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; |
525cd185 | 3191 | l2cap_ertm_reassembly_sdu(chan, skb, control); |
42e5c802 GP |
3192 | chan->buffer_seq_srej = |
3193 | (chan->buffer_seq_srej + 1) % 64; | |
8ff50ec0 | 3194 | tx_seq = (tx_seq + 1) % 64; |
8f17154f GP |
3195 | } |
3196 | } | |
3197 | ||
525cd185 | 3198 | static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3199 | { |
8f17154f GP |
3200 | struct srej_list *l, *tmp; |
3201 | u16 control; | |
3202 | ||
39d5a3ee | 3203 | list_for_each_entry_safe(l, tmp, &chan->srej_l, list) { |
8f17154f GP |
3204 | if (l->tx_seq == tx_seq) { |
3205 | list_del(&l->list); | |
3206 | kfree(l); | |
3207 | return; | |
3208 | } | |
3209 | control = L2CAP_SUPER_SELECT_REJECT; | |
3210 | control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; | |
525cd185 | 3211 | l2cap_send_sframe(chan, control); |
8f17154f | 3212 | list_del(&l->list); |
39d5a3ee | 3213 | list_add_tail(&l->list, &chan->srej_l); |
8f17154f GP |
3214 | } |
3215 | } | |
3216 | ||
525cd185 | 3217 | static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq) |
8f17154f | 3218 | { |
8f17154f GP |
3219 | struct srej_list *new; |
3220 | u16 control; | |
3221 | ||
42e5c802 | 3222 | while (tx_seq != chan->expected_tx_seq) { |
8f17154f | 3223 | control = L2CAP_SUPER_SELECT_REJECT; |
42e5c802 | 3224 | control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; |
525cd185 | 3225 | l2cap_send_sframe(chan, control); |
8f17154f GP |
3226 | |
3227 | new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); | |
42e5c802 GP |
3228 | new->tx_seq = chan->expected_tx_seq; |
3229 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
39d5a3ee | 3230 | list_add_tail(&new->list, &chan->srej_l); |
8f17154f | 3231 | } |
42e5c802 | 3232 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f GP |
3233 | } |
3234 | ||
525cd185 | 3235 | static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
1c2acffb | 3236 | { |
49208c9c | 3237 | struct l2cap_pinfo *pi = l2cap_pi(chan->sk); |
1c2acffb | 3238 | u8 tx_seq = __get_txseq(rx_control); |
9f121a5a | 3239 | u8 req_seq = __get_reqseq(rx_control); |
8f17154f | 3240 | u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; |
f6337c77 | 3241 | int tx_seq_offset, expected_tx_seq_offset; |
47d1ec61 | 3242 | int num_to_ack = (chan->tx_win/6) + 1; |
1c2acffb GP |
3243 | int err = 0; |
3244 | ||
525cd185 GP |
3245 | BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len, |
3246 | tx_seq, rx_control); | |
1c2acffb | 3247 | |
9b16dc65 | 3248 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3249 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3250 | del_timer(&chan->monitor_timer); |
6a026610 | 3251 | if (chan->unacked_frames > 0) |
1d8f5d16 | 3252 | __mod_retrans_timer(); |
525cd185 | 3253 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
1d8f5d16 GP |
3254 | } |
3255 | ||
42e5c802 GP |
3256 | chan->expected_ack_seq = req_seq; |
3257 | l2cap_drop_acked_frames(chan); | |
9f121a5a | 3258 | |
42e5c802 | 3259 | if (tx_seq == chan->expected_tx_seq) |
8f17154f | 3260 | goto expected; |
1c2acffb | 3261 | |
42e5c802 | 3262 | tx_seq_offset = (tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3263 | if (tx_seq_offset < 0) |
3264 | tx_seq_offset += 64; | |
3265 | ||
3266 | /* invalid tx_seq */ | |
47d1ec61 | 3267 | if (tx_seq_offset >= chan->tx_win) { |
e92c8e70 | 3268 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
9b53350d JPRV |
3269 | goto drop; |
3270 | } | |
3271 | ||
525cd185 | 3272 | if (chan->conn_state == L2CAP_CONN_LOCAL_BUSY) |
1890d36b GP |
3273 | goto drop; |
3274 | ||
525cd185 | 3275 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
8f17154f | 3276 | struct srej_list *first; |
30afb5b2 | 3277 | |
39d5a3ee | 3278 | first = list_first_entry(&chan->srej_l, |
8f17154f GP |
3279 | struct srej_list, list); |
3280 | if (tx_seq == first->tx_seq) { | |
42e5c802 | 3281 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
525cd185 | 3282 | l2cap_check_srej_gap(chan, tx_seq); |
8f17154f GP |
3283 | |
3284 | list_del(&first->list); | |
3285 | kfree(first); | |
3286 | ||
39d5a3ee | 3287 | if (list_empty(&chan->srej_l)) { |
42e5c802 | 3288 | chan->buffer_seq = chan->buffer_seq_srej; |
525cd185 GP |
3289 | chan->conn_state &= ~L2CAP_CONN_SREJ_SENT; |
3290 | l2cap_send_ack(chan); | |
49208c9c | 3291 | BT_DBG("chan %p, Exit SREJ_SENT", chan); |
8f17154f GP |
3292 | } |
3293 | } else { | |
3294 | struct srej_list *l; | |
9b53350d JPRV |
3295 | |
3296 | /* duplicated tx_seq */ | |
42e5c802 | 3297 | if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0) |
9b53350d | 3298 | goto drop; |
8f17154f | 3299 | |
39d5a3ee | 3300 | list_for_each_entry(l, &chan->srej_l, list) { |
8f17154f | 3301 | if (l->tx_seq == tx_seq) { |
525cd185 | 3302 | l2cap_resend_srejframe(chan, tx_seq); |
8f17154f GP |
3303 | return 0; |
3304 | } | |
3305 | } | |
525cd185 | 3306 | l2cap_send_srejframe(chan, tx_seq); |
30afb5b2 GP |
3307 | } |
3308 | } else { | |
9b53350d | 3309 | expected_tx_seq_offset = |
42e5c802 | 3310 | (chan->expected_tx_seq - chan->buffer_seq) % 64; |
9b53350d JPRV |
3311 | if (expected_tx_seq_offset < 0) |
3312 | expected_tx_seq_offset += 64; | |
3313 | ||
3314 | /* duplicated tx_seq */ | |
3315 | if (tx_seq_offset < expected_tx_seq_offset) | |
3316 | goto drop; | |
3317 | ||
525cd185 | 3318 | chan->conn_state |= L2CAP_CONN_SREJ_SENT; |
1c2acffb | 3319 | |
49208c9c | 3320 | BT_DBG("chan %p, Enter SREJ", chan); |
0e98958d | 3321 | |
39d5a3ee | 3322 | INIT_LIST_HEAD(&chan->srej_l); |
42e5c802 | 3323 | chan->buffer_seq_srej = chan->buffer_seq; |
8f17154f | 3324 | |
f1c6775b GP |
3325 | __skb_queue_head_init(&chan->srej_q); |
3326 | __skb_queue_head_init(&chan->busy_q); | |
42e5c802 | 3327 | l2cap_add_to_srej_queue(chan, skb, tx_seq, sar); |
8f17154f | 3328 | |
525cd185 | 3329 | chan->conn_state |= L2CAP_CONN_SEND_PBIT; |
ef54fd93 | 3330 | |
525cd185 | 3331 | l2cap_send_srejframe(chan, tx_seq); |
7fe9b298 | 3332 | |
e92c8e70 | 3333 | del_timer(&chan->ack_timer); |
1c2acffb | 3334 | } |
30afb5b2 GP |
3335 | return 0; |
3336 | ||
8f17154f | 3337 | expected: |
42e5c802 | 3338 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; |
8f17154f | 3339 | |
525cd185 | 3340 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { |
3b1a9f3f GP |
3341 | bt_cb(skb)->tx_seq = tx_seq; |
3342 | bt_cb(skb)->sar = sar; | |
f1c6775b | 3343 | __skb_queue_tail(&chan->srej_q, skb); |
8f17154f GP |
3344 | return 0; |
3345 | } | |
3346 | ||
525cd185 | 3347 | err = l2cap_push_rx_skb(chan, skb, rx_control); |
2ece3684 GP |
3348 | if (err < 0) |
3349 | return 0; | |
3350 | ||
4ec10d97 | 3351 | if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 GP |
3352 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3353 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3354 | else |
525cd185 | 3355 | l2cap_retransmit_frames(chan); |
4ec10d97 GP |
3356 | } |
3357 | ||
c1b4f43b GP |
3358 | __mod_ack_timer(); |
3359 | ||
6a026610 GP |
3360 | chan->num_acked = (chan->num_acked + 1) % num_to_ack; |
3361 | if (chan->num_acked == num_to_ack - 1) | |
525cd185 | 3362 | l2cap_send_ack(chan); |
9e917af1 | 3363 | |
8f17154f | 3364 | return 0; |
9b53350d JPRV |
3365 | |
3366 | drop: | |
3367 | kfree_skb(skb); | |
3368 | return 0; | |
1c2acffb GP |
3369 | } |
3370 | ||
525cd185 | 3371 | static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control) |
1c2acffb | 3372 | { |
49208c9c | 3373 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control), |
0e98958d GP |
3374 | rx_control); |
3375 | ||
42e5c802 GP |
3376 | chan->expected_ack_seq = __get_reqseq(rx_control); |
3377 | l2cap_drop_acked_frames(chan); | |
1c2acffb | 3378 | |
e072745f | 3379 | if (rx_control & L2CAP_CTRL_POLL) { |
525cd185 GP |
3380 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3381 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) { | |
3382 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && | |
6a026610 | 3383 | (chan->unacked_frames > 0)) |
05fbd89d GP |
3384 | __mod_retrans_timer(); |
3385 | ||
525cd185 GP |
3386 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3387 | l2cap_send_srejtail(chan); | |
05fbd89d | 3388 | } else { |
525cd185 | 3389 | l2cap_send_i_or_rr_or_rnr(chan); |
05fbd89d | 3390 | } |
1d8f5d16 | 3391 | |
e072745f | 3392 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3393 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
4ec10d97 | 3394 | |
525cd185 GP |
3395 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3396 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3397 | else |
525cd185 | 3398 | l2cap_retransmit_frames(chan); |
2246b2f1 | 3399 | |
e072745f | 3400 | } else { |
525cd185 | 3401 | if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) && |
6a026610 | 3402 | (chan->unacked_frames > 0)) |
e072745f | 3403 | __mod_retrans_timer(); |
1c2acffb | 3404 | |
525cd185 GP |
3405 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
3406 | if (chan->conn_state & L2CAP_CONN_SREJ_SENT) | |
3407 | l2cap_send_ack(chan); | |
894718a6 | 3408 | else |
525cd185 | 3409 | l2cap_ertm_send(chan); |
e072745f GP |
3410 | } |
3411 | } | |
2246b2f1 | 3412 | |
525cd185 | 3413 | static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3414 | { |
e072745f | 3415 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3416 | |
525cd185 | 3417 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3418 | |
525cd185 | 3419 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
e072745f | 3420 | |
42e5c802 GP |
3421 | chan->expected_ack_seq = tx_seq; |
3422 | l2cap_drop_acked_frames(chan); | |
e072745f GP |
3423 | |
3424 | if (rx_control & L2CAP_CTRL_FINAL) { | |
525cd185 GP |
3425 | if (chan->conn_state & L2CAP_CONN_REJ_ACT) |
3426 | chan->conn_state &= ~L2CAP_CONN_REJ_ACT; | |
dfc909be | 3427 | else |
525cd185 | 3428 | l2cap_retransmit_frames(chan); |
e072745f | 3429 | } else { |
525cd185 | 3430 | l2cap_retransmit_frames(chan); |
30afb5b2 | 3431 | |
525cd185 GP |
3432 | if (chan->conn_state & L2CAP_CONN_WAIT_F) |
3433 | chan->conn_state |= L2CAP_CONN_REJ_ACT; | |
e072745f GP |
3434 | } |
3435 | } | |
525cd185 | 3436 | static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3437 | { |
e072745f | 3438 | u8 tx_seq = __get_reqseq(rx_control); |
30afb5b2 | 3439 | |
525cd185 | 3440 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3441 | |
525cd185 | 3442 | chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; |
2246b2f1 | 3443 | |
e072745f | 3444 | if (rx_control & L2CAP_CTRL_POLL) { |
42e5c802 GP |
3445 | chan->expected_ack_seq = tx_seq; |
3446 | l2cap_drop_acked_frames(chan); | |
3cb123d1 | 3447 | |
525cd185 GP |
3448 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3449 | l2cap_retransmit_one_frame(chan, tx_seq); | |
dfc909be | 3450 | |
525cd185 | 3451 | l2cap_ertm_send(chan); |
dfc909be | 3452 | |
525cd185 | 3453 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { |
6a026610 | 3454 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3455 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3456 | } |
e072745f | 3457 | } else if (rx_control & L2CAP_CTRL_FINAL) { |
525cd185 | 3458 | if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) && |
6a026610 | 3459 | chan->srej_save_reqseq == tx_seq) |
525cd185 | 3460 | chan->conn_state &= ~L2CAP_CONN_SREJ_ACT; |
e072745f | 3461 | else |
525cd185 | 3462 | l2cap_retransmit_one_frame(chan, tx_seq); |
e072745f | 3463 | } else { |
525cd185 GP |
3464 | l2cap_retransmit_one_frame(chan, tx_seq); |
3465 | if (chan->conn_state & L2CAP_CONN_WAIT_F) { | |
6a026610 | 3466 | chan->srej_save_reqseq = tx_seq; |
525cd185 | 3467 | chan->conn_state |= L2CAP_CONN_SREJ_ACT; |
ef54fd93 | 3468 | } |
e072745f GP |
3469 | } |
3470 | } | |
3471 | ||
525cd185 | 3472 | static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control) |
e072745f | 3473 | { |
e072745f GP |
3474 | u8 tx_seq = __get_reqseq(rx_control); |
3475 | ||
525cd185 | 3476 | BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control); |
0e98958d | 3477 | |
525cd185 | 3478 | chan->conn_state |= L2CAP_CONN_REMOTE_BUSY; |
42e5c802 GP |
3479 | chan->expected_ack_seq = tx_seq; |
3480 | l2cap_drop_acked_frames(chan); | |
e072745f | 3481 | |
3cb123d1 | 3482 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3483 | chan->conn_state |= L2CAP_CONN_SEND_FBIT; |
3cb123d1 | 3484 | |
525cd185 | 3485 | if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) { |
e92c8e70 | 3486 | del_timer(&chan->retrans_timer); |
a2e12a2a | 3487 | if (rx_control & L2CAP_CTRL_POLL) |
525cd185 | 3488 | l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL); |
99b0d4b7 | 3489 | return; |
e072745f | 3490 | } |
99b0d4b7 GP |
3491 | |
3492 | if (rx_control & L2CAP_CTRL_POLL) | |
525cd185 | 3493 | l2cap_send_srejtail(chan); |
99b0d4b7 | 3494 | else |
525cd185 | 3495 | l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY); |
e072745f GP |
3496 | } |
3497 | ||
525cd185 | 3498 | static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb) |
e072745f | 3499 | { |
525cd185 | 3500 | BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len); |
e072745f | 3501 | |
9b16dc65 | 3502 | if (L2CAP_CTRL_FINAL & rx_control && |
525cd185 | 3503 | chan->conn_state & L2CAP_CONN_WAIT_F) { |
e92c8e70 | 3504 | del_timer(&chan->monitor_timer); |
6a026610 | 3505 | if (chan->unacked_frames > 0) |
e072745f | 3506 | __mod_retrans_timer(); |
525cd185 | 3507 | chan->conn_state &= ~L2CAP_CONN_WAIT_F; |
e072745f GP |
3508 | } |
3509 | ||
3510 | switch (rx_control & L2CAP_CTRL_SUPERVISE) { | |
3511 | case L2CAP_SUPER_RCV_READY: | |
525cd185 | 3512 | l2cap_data_channel_rrframe(chan, rx_control); |
8f17154f GP |
3513 | break; |
3514 | ||
e072745f | 3515 | case L2CAP_SUPER_REJECT: |
525cd185 | 3516 | l2cap_data_channel_rejframe(chan, rx_control); |
e072745f | 3517 | break; |
2246b2f1 | 3518 | |
e072745f | 3519 | case L2CAP_SUPER_SELECT_REJECT: |
525cd185 | 3520 | l2cap_data_channel_srejframe(chan, rx_control); |
e072745f GP |
3521 | break; |
3522 | ||
3523 | case L2CAP_SUPER_RCV_NOT_READY: | |
525cd185 | 3524 | l2cap_data_channel_rnrframe(chan, rx_control); |
1c2acffb GP |
3525 | break; |
3526 | } | |
3527 | ||
faaebd19 | 3528 | kfree_skb(skb); |
1c2acffb GP |
3529 | return 0; |
3530 | } | |
3531 | ||
218bb9df GP |
3532 | static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) |
3533 | { | |
525cd185 | 3534 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
218bb9df GP |
3535 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
3536 | u16 control; | |
3537 | u8 req_seq; | |
3538 | int len, next_tx_seq_offset, req_seq_offset; | |
3539 | ||
3540 | control = get_unaligned_le16(skb->data); | |
3541 | skb_pull(skb, 2); | |
3542 | len = skb->len; | |
3543 | ||
3544 | /* | |
3545 | * We can just drop the corrupted I-frame here. | |
3546 | * Receiver will miss it and start proper recovery | |
3547 | * procedures and ask retransmission. | |
3548 | */ | |
47d1ec61 | 3549 | if (l2cap_check_fcs(chan, skb)) |
218bb9df GP |
3550 | goto drop; |
3551 | ||
3552 | if (__is_sar_start(control) && __is_iframe(control)) | |
3553 | len -= 2; | |
3554 | ||
47d1ec61 | 3555 | if (chan->fcs == L2CAP_FCS_CRC16) |
218bb9df GP |
3556 | len -= 2; |
3557 | ||
47d1ec61 | 3558 | if (len > chan->mps) { |
e92c8e70 | 3559 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3560 | goto drop; |
3561 | } | |
3562 | ||
3563 | req_seq = __get_reqseq(control); | |
42e5c802 | 3564 | req_seq_offset = (req_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3565 | if (req_seq_offset < 0) |
3566 | req_seq_offset += 64; | |
3567 | ||
3568 | next_tx_seq_offset = | |
42e5c802 | 3569 | (chan->next_tx_seq - chan->expected_ack_seq) % 64; |
218bb9df GP |
3570 | if (next_tx_seq_offset < 0) |
3571 | next_tx_seq_offset += 64; | |
3572 | ||
3573 | /* check for invalid req-seq */ | |
3574 | if (req_seq_offset > next_tx_seq_offset) { | |
e92c8e70 | 3575 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3576 | goto drop; |
3577 | } | |
3578 | ||
3579 | if (__is_iframe(control)) { | |
3580 | if (len < 0) { | |
e92c8e70 | 3581 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3582 | goto drop; |
3583 | } | |
3584 | ||
525cd185 | 3585 | l2cap_data_channel_iframe(chan, control, skb); |
218bb9df GP |
3586 | } else { |
3587 | if (len != 0) { | |
3588 | BT_ERR("%d", len); | |
e92c8e70 | 3589 | l2cap_send_disconn_req(pi->conn, chan, ECONNRESET); |
218bb9df GP |
3590 | goto drop; |
3591 | } | |
3592 | ||
525cd185 | 3593 | l2cap_data_channel_sframe(chan, control, skb); |
218bb9df GP |
3594 | } |
3595 | ||
3596 | return 0; | |
3597 | ||
3598 | drop: | |
3599 | kfree_skb(skb); | |
3600 | return 0; | |
3601 | } | |
3602 | ||
1da177e4 LT |
3603 | static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) |
3604 | { | |
48454079 | 3605 | struct l2cap_chan *chan; |
1da177e4 | 3606 | struct sock *sk; |
6840ed07 | 3607 | struct l2cap_pinfo *pi; |
51893f88 | 3608 | u16 control; |
218bb9df GP |
3609 | u8 tx_seq; |
3610 | int len; | |
1da177e4 | 3611 | |
baa7e1fa | 3612 | chan = l2cap_get_chan_by_scid(conn, cid); |
48454079 | 3613 | if (!chan) { |
1da177e4 LT |
3614 | BT_DBG("unknown cid 0x%4.4x", cid); |
3615 | goto drop; | |
3616 | } | |
3617 | ||
48454079 | 3618 | sk = chan->sk; |
6840ed07 GP |
3619 | pi = l2cap_pi(sk); |
3620 | ||
49208c9c | 3621 | BT_DBG("chan %p, len %d", chan, skb->len); |
1da177e4 LT |
3622 | |
3623 | if (sk->sk_state != BT_CONNECTED) | |
3624 | goto drop; | |
3625 | ||
0c1bc5c6 | 3626 | switch (chan->mode) { |
1c2acffb GP |
3627 | case L2CAP_MODE_BASIC: |
3628 | /* If socket recv buffers overflows we drop data here | |
3629 | * which is *bad* because L2CAP has to be reliable. | |
3630 | * But we don't have any other choice. L2CAP doesn't | |
3631 | * provide flow control mechanism. */ | |
1da177e4 | 3632 | |
0c1bc5c6 | 3633 | if (chan->imtu < skb->len) |
1c2acffb | 3634 | goto drop; |
1da177e4 | 3635 | |
1c2acffb GP |
3636 | if (!sock_queue_rcv_skb(sk, skb)) |
3637 | goto done; | |
3638 | break; | |
3639 | ||
3640 | case L2CAP_MODE_ERTM: | |
218bb9df GP |
3641 | if (!sock_owned_by_user(sk)) { |
3642 | l2cap_ertm_data_rcv(sk, skb); | |
277ffbe3 | 3643 | } else { |
218bb9df | 3644 | if (sk_add_backlog(sk, skb)) |
277ffbe3 | 3645 | goto drop; |
277ffbe3 | 3646 | } |
1c2acffb | 3647 | |
fcafde2e | 3648 | goto done; |
1c2acffb | 3649 | |
6840ed07 GP |
3650 | case L2CAP_MODE_STREAMING: |
3651 | control = get_unaligned_le16(skb->data); | |
3652 | skb_pull(skb, 2); | |
3653 | len = skb->len; | |
3654 | ||
47d1ec61 | 3655 | if (l2cap_check_fcs(chan, skb)) |
26000089 GP |
3656 | goto drop; |
3657 | ||
6840ed07 GP |
3658 | if (__is_sar_start(control)) |
3659 | len -= 2; | |
3660 | ||
47d1ec61 | 3661 | if (chan->fcs == L2CAP_FCS_CRC16) |
fcc203c3 GP |
3662 | len -= 2; |
3663 | ||
47d1ec61 | 3664 | if (len > chan->mps || len < 0 || __is_sframe(control)) |
6840ed07 GP |
3665 | goto drop; |
3666 | ||
3667 | tx_seq = __get_txseq(control); | |
3668 | ||
42e5c802 GP |
3669 | if (chan->expected_tx_seq == tx_seq) |
3670 | chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64; | |
6840ed07 | 3671 | else |
42e5c802 | 3672 | chan->expected_tx_seq = (tx_seq + 1) % 64; |
6840ed07 | 3673 | |
525cd185 | 3674 | l2cap_streaming_reassembly_sdu(chan, skb, control); |
6840ed07 GP |
3675 | |
3676 | goto done; | |
3677 | ||
1c2acffb | 3678 | default: |
0c1bc5c6 | 3679 | BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode); |
1c2acffb GP |
3680 | break; |
3681 | } | |
1da177e4 LT |
3682 | |
3683 | drop: | |
3684 | kfree_skb(skb); | |
3685 | ||
3686 | done: | |
0139418c MH |
3687 | if (sk) |
3688 | bh_unlock_sock(sk); | |
3689 | ||
1da177e4 LT |
3690 | return 0; |
3691 | } | |
3692 | ||
8e036fc3 | 3693 | static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) |
1da177e4 LT |
3694 | { |
3695 | struct sock *sk; | |
3696 | ||
3697 | sk = l2cap_get_sock_by_psm(0, psm, conn->src); | |
3698 | if (!sk) | |
3699 | goto drop; | |
3700 | ||
e0f0cb56 GP |
3701 | bh_lock_sock(sk); |
3702 | ||
1da177e4 LT |
3703 | BT_DBG("sk %p, len %d", sk, skb->len); |
3704 | ||
3705 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3706 | goto drop; | |
3707 | ||
0c1bc5c6 | 3708 | if (l2cap_pi(sk)->chan->imtu < skb->len) |
1da177e4 LT |
3709 | goto drop; |
3710 | ||
3711 | if (!sock_queue_rcv_skb(sk, skb)) | |
3712 | goto done; | |
3713 | ||
3714 | drop: | |
3715 | kfree_skb(skb); | |
3716 | ||
3717 | done: | |
af05b30b GP |
3718 | if (sk) |
3719 | bh_unlock_sock(sk); | |
1da177e4 LT |
3720 | return 0; |
3721 | } | |
3722 | ||
9f69bda6 GP |
3723 | static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb) |
3724 | { | |
3725 | struct sock *sk; | |
3726 | ||
3727 | sk = l2cap_get_sock_by_scid(0, cid, conn->src); | |
3728 | if (!sk) | |
3729 | goto drop; | |
3730 | ||
3731 | bh_lock_sock(sk); | |
3732 | ||
3733 | BT_DBG("sk %p, len %d", sk, skb->len); | |
3734 | ||
3735 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) | |
3736 | goto drop; | |
3737 | ||
0c1bc5c6 | 3738 | if (l2cap_pi(sk)->chan->imtu < skb->len) |
9f69bda6 GP |
3739 | goto drop; |
3740 | ||
3741 | if (!sock_queue_rcv_skb(sk, skb)) | |
3742 | goto done; | |
3743 | ||
3744 | drop: | |
3745 | kfree_skb(skb); | |
3746 | ||
3747 | done: | |
3748 | if (sk) | |
3749 | bh_unlock_sock(sk); | |
3750 | return 0; | |
3751 | } | |
3752 | ||
1da177e4 LT |
3753 | static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) |
3754 | { | |
3755 | struct l2cap_hdr *lh = (void *) skb->data; | |
8e036fc3 AV |
3756 | u16 cid, len; |
3757 | __le16 psm; | |
1da177e4 LT |
3758 | |
3759 | skb_pull(skb, L2CAP_HDR_SIZE); | |
3760 | cid = __le16_to_cpu(lh->cid); | |
3761 | len = __le16_to_cpu(lh->len); | |
3762 | ||
1c2acffb GP |
3763 | if (len != skb->len) { |
3764 | kfree_skb(skb); | |
3765 | return; | |
3766 | } | |
3767 | ||
1da177e4 LT |
3768 | BT_DBG("len %d, cid 0x%4.4x", len, cid); |
3769 | ||
3770 | switch (cid) { | |
3300d9a9 | 3771 | case L2CAP_CID_LE_SIGNALING: |
8db4dc46 | 3772 | case L2CAP_CID_SIGNALING: |
1da177e4 LT |
3773 | l2cap_sig_channel(conn, skb); |
3774 | break; | |
3775 | ||
8db4dc46 | 3776 | case L2CAP_CID_CONN_LESS: |
1b7bf4ed | 3777 | psm = get_unaligned_le16(skb->data); |
1da177e4 LT |
3778 | skb_pull(skb, 2); |
3779 | l2cap_conless_channel(conn, psm, skb); | |
3780 | break; | |
3781 | ||
9f69bda6 GP |
3782 | case L2CAP_CID_LE_DATA: |
3783 | l2cap_att_channel(conn, cid, skb); | |
3784 | break; | |
3785 | ||
1da177e4 LT |
3786 | default: |
3787 | l2cap_data_channel(conn, cid, skb); | |
3788 | break; | |
3789 | } | |
3790 | } | |
3791 | ||
3792 | /* ---- L2CAP interface with lower layer (HCI) ---- */ | |
3793 | ||
3794 | static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) | |
3795 | { | |
3796 | int exact = 0, lm1 = 0, lm2 = 0; | |
3797 | register struct sock *sk; | |
3798 | struct hlist_node *node; | |
3799 | ||
3800 | if (type != ACL_LINK) | |
963cf687 | 3801 | return -EINVAL; |
1da177e4 LT |
3802 | |
3803 | BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); | |
3804 | ||
3805 | /* Find listening sockets and check their link_mode */ | |
3806 | read_lock(&l2cap_sk_list.lock); | |
3807 | sk_for_each(sk, node, &l2cap_sk_list.head) { | |
4343478f GP |
3808 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
3809 | ||
1da177e4 LT |
3810 | if (sk->sk_state != BT_LISTEN) |
3811 | continue; | |
3812 | ||
3813 | if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { | |
2af6b9d5 | 3814 | lm1 |= HCI_LM_ACCEPT; |
4343478f | 3815 | if (chan->role_switch) |
2af6b9d5 | 3816 | lm1 |= HCI_LM_MASTER; |
1da177e4 | 3817 | exact++; |
2af6b9d5 MH |
3818 | } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { |
3819 | lm2 |= HCI_LM_ACCEPT; | |
4343478f | 3820 | if (chan->role_switch) |
2af6b9d5 MH |
3821 | lm2 |= HCI_LM_MASTER; |
3822 | } | |
1da177e4 LT |
3823 | } |
3824 | read_unlock(&l2cap_sk_list.lock); | |
3825 | ||
3826 | return exact ? lm1 : lm2; | |
3827 | } | |
3828 | ||
3829 | static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) | |
3830 | { | |
0139418c MH |
3831 | struct l2cap_conn *conn; |
3832 | ||
1da177e4 LT |
3833 | BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); |
3834 | ||
acd7d370 | 3835 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3836 | return -EINVAL; |
1da177e4 LT |
3837 | |
3838 | if (!status) { | |
1da177e4 LT |
3839 | conn = l2cap_conn_add(hcon, status); |
3840 | if (conn) | |
3841 | l2cap_conn_ready(conn); | |
0139418c | 3842 | } else |
1da177e4 LT |
3843 | l2cap_conn_del(hcon, bt_err(status)); |
3844 | ||
3845 | return 0; | |
3846 | } | |
3847 | ||
2950f21a MH |
3848 | static int l2cap_disconn_ind(struct hci_conn *hcon) |
3849 | { | |
3850 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3851 | ||
3852 | BT_DBG("hcon %p", hcon); | |
3853 | ||
3854 | if (hcon->type != ACL_LINK || !conn) | |
3855 | return 0x13; | |
3856 | ||
3857 | return conn->disc_reason; | |
3858 | } | |
3859 | ||
3860 | static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) | |
1da177e4 LT |
3861 | { |
3862 | BT_DBG("hcon %p reason %d", hcon, reason); | |
3863 | ||
acd7d370 | 3864 | if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK)) |
963cf687 | 3865 | return -EINVAL; |
1da177e4 LT |
3866 | |
3867 | l2cap_conn_del(hcon, bt_err(reason)); | |
0139418c | 3868 | |
1da177e4 LT |
3869 | return 0; |
3870 | } | |
3871 | ||
4343478f | 3872 | static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt) |
f62e4323 | 3873 | { |
4343478f GP |
3874 | struct sock *sk = chan->sk; |
3875 | ||
bd3c9e25 | 3876 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) |
255c7601 MH |
3877 | return; |
3878 | ||
f62e4323 | 3879 | if (encrypt == 0x00) { |
4343478f | 3880 | if (chan->sec_level == BT_SECURITY_MEDIUM) { |
f62e4323 MH |
3881 | l2cap_sock_clear_timer(sk); |
3882 | l2cap_sock_set_timer(sk, HZ * 5); | |
4343478f | 3883 | } else if (chan->sec_level == BT_SECURITY_HIGH) |
f62e4323 MH |
3884 | __l2cap_sock_close(sk, ECONNREFUSED); |
3885 | } else { | |
4343478f | 3886 | if (chan->sec_level == BT_SECURITY_MEDIUM) |
f62e4323 MH |
3887 | l2cap_sock_clear_timer(sk); |
3888 | } | |
3889 | } | |
3890 | ||
8c1b2355 | 3891 | static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) |
1da177e4 | 3892 | { |
0139418c | 3893 | struct l2cap_conn *conn = hcon->l2cap_data; |
48454079 | 3894 | struct l2cap_chan *chan; |
1da177e4 | 3895 | |
0139418c | 3896 | if (!conn) |
1da177e4 | 3897 | return 0; |
0139418c | 3898 | |
1da177e4 LT |
3899 | BT_DBG("conn %p", conn); |
3900 | ||
baa7e1fa | 3901 | read_lock(&conn->chan_lock); |
1da177e4 | 3902 | |
baa7e1fa | 3903 | list_for_each_entry(chan, &conn->chan_l, list) { |
48454079 | 3904 | struct sock *sk = chan->sk; |
baa7e1fa | 3905 | |
1da177e4 LT |
3906 | bh_lock_sock(sk); |
3907 | ||
b4450035 | 3908 | if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) { |
6a8d3010 MH |
3909 | bh_unlock_sock(sk); |
3910 | continue; | |
3911 | } | |
3912 | ||
f62e4323 | 3913 | if (!status && (sk->sk_state == BT_CONNECTED || |
8c1b2355 | 3914 | sk->sk_state == BT_CONFIG)) { |
4343478f | 3915 | l2cap_check_encryption(chan, encrypt); |
9719f8af MH |
3916 | bh_unlock_sock(sk); |
3917 | continue; | |
3918 | } | |
3919 | ||
b1235d79 MH |
3920 | if (sk->sk_state == BT_CONNECT) { |
3921 | if (!status) { | |
3922 | struct l2cap_conn_req req; | |
3923 | req.scid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3924 | req.psm = l2cap_pi(sk)->psm; | |
1da177e4 | 3925 | |
fc7f8a7e | 3926 | chan->ident = l2cap_get_ident(conn); |
b4450035 | 3927 | chan->conf_state |= L2CAP_CONF_CONNECT_PEND; |
1da177e4 | 3928 | |
fc7f8a7e | 3929 | l2cap_send_cmd(conn, chan->ident, |
b1235d79 MH |
3930 | L2CAP_CONN_REQ, sizeof(req), &req); |
3931 | } else { | |
3932 | l2cap_sock_clear_timer(sk); | |
3933 | l2cap_sock_set_timer(sk, HZ / 10); | |
3934 | } | |
3935 | } else if (sk->sk_state == BT_CONNECT2) { | |
3936 | struct l2cap_conn_rsp rsp; | |
3937 | __u16 result; | |
1da177e4 | 3938 | |
b1235d79 MH |
3939 | if (!status) { |
3940 | sk->sk_state = BT_CONFIG; | |
3941 | result = L2CAP_CR_SUCCESS; | |
3942 | } else { | |
3943 | sk->sk_state = BT_DISCONN; | |
3944 | l2cap_sock_set_timer(sk, HZ / 10); | |
3945 | result = L2CAP_CR_SEC_BLOCK; | |
3946 | } | |
3947 | ||
3948 | rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); | |
3949 | rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); | |
3950 | rsp.result = cpu_to_le16(result); | |
e7c29cb1 | 3951 | rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); |
fc7f8a7e GP |
3952 | l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, |
3953 | sizeof(rsp), &rsp); | |
b1235d79 | 3954 | } |
1da177e4 LT |
3955 | |
3956 | bh_unlock_sock(sk); | |
3957 | } | |
3958 | ||
baa7e1fa | 3959 | read_unlock(&conn->chan_lock); |
b1235d79 | 3960 | |
1da177e4 LT |
3961 | return 0; |
3962 | } | |
3963 | ||
3964 | static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) | |
3965 | { | |
3966 | struct l2cap_conn *conn = hcon->l2cap_data; | |
3967 | ||
5a08ecce AE |
3968 | if (!conn) |
3969 | conn = l2cap_conn_add(hcon, 0); | |
3970 | ||
3971 | if (!conn) | |
1da177e4 LT |
3972 | goto drop; |
3973 | ||
3974 | BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); | |
3975 | ||
e702112f | 3976 | if (!(flags & ACL_CONT)) { |
1da177e4 | 3977 | struct l2cap_hdr *hdr; |
48454079 | 3978 | struct l2cap_chan *chan; |
89794813 | 3979 | u16 cid; |
1da177e4 LT |
3980 | int len; |
3981 | ||
3982 | if (conn->rx_len) { | |
3983 | BT_ERR("Unexpected start frame (len %d)", skb->len); | |
3984 | kfree_skb(conn->rx_skb); | |
3985 | conn->rx_skb = NULL; | |
3986 | conn->rx_len = 0; | |
3987 | l2cap_conn_unreliable(conn, ECOMM); | |
3988 | } | |
3989 | ||
aae7fe22 AE |
3990 | /* Start fragment always begin with Basic L2CAP header */ |
3991 | if (skb->len < L2CAP_HDR_SIZE) { | |
1da177e4 LT |
3992 | BT_ERR("Frame is too short (len %d)", skb->len); |
3993 | l2cap_conn_unreliable(conn, ECOMM); | |
3994 | goto drop; | |
3995 | } | |
3996 | ||
3997 | hdr = (struct l2cap_hdr *) skb->data; | |
3998 | len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; | |
89794813 | 3999 | cid = __le16_to_cpu(hdr->cid); |
1da177e4 LT |
4000 | |
4001 | if (len == skb->len) { | |
4002 | /* Complete frame received */ | |
4003 | l2cap_recv_frame(conn, skb); | |
4004 | return 0; | |
4005 | } | |
4006 | ||
4007 | BT_DBG("Start: total len %d, frag len %d", len, skb->len); | |
4008 | ||
4009 | if (skb->len > len) { | |
4010 | BT_ERR("Frame is too long (len %d, expected len %d)", | |
4011 | skb->len, len); | |
4012 | l2cap_conn_unreliable(conn, ECOMM); | |
4013 | goto drop; | |
4014 | } | |
4015 | ||
baa7e1fa | 4016 | chan = l2cap_get_chan_by_scid(conn, cid); |
89794813 | 4017 | |
48454079 GP |
4018 | if (chan && chan->sk) { |
4019 | struct sock *sk = chan->sk; | |
89794813 | 4020 | |
0c1bc5c6 | 4021 | if (chan->imtu < len - L2CAP_HDR_SIZE) { |
48454079 GP |
4022 | BT_ERR("Frame exceeding recv MTU (len %d, " |
4023 | "MTU %d)", len, | |
0c1bc5c6 | 4024 | chan->imtu); |
48454079 GP |
4025 | bh_unlock_sock(sk); |
4026 | l2cap_conn_unreliable(conn, ECOMM); | |
4027 | goto drop; | |
4028 | } | |
89794813 | 4029 | bh_unlock_sock(sk); |
48454079 | 4030 | } |
89794813 | 4031 | |
1da177e4 | 4032 | /* Allocate skb for the complete frame (with header) */ |
af05b30b GP |
4033 | conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); |
4034 | if (!conn->rx_skb) | |
1da177e4 LT |
4035 | goto drop; |
4036 | ||
d626f62b | 4037 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4038 | skb->len); |
1da177e4 LT |
4039 | conn->rx_len = len - skb->len; |
4040 | } else { | |
4041 | BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); | |
4042 | ||
4043 | if (!conn->rx_len) { | |
4044 | BT_ERR("Unexpected continuation frame (len %d)", skb->len); | |
4045 | l2cap_conn_unreliable(conn, ECOMM); | |
4046 | goto drop; | |
4047 | } | |
4048 | ||
4049 | if (skb->len > conn->rx_len) { | |
4050 | BT_ERR("Fragment is too long (len %d, expected %d)", | |
4051 | skb->len, conn->rx_len); | |
4052 | kfree_skb(conn->rx_skb); | |
4053 | conn->rx_skb = NULL; | |
4054 | conn->rx_len = 0; | |
4055 | l2cap_conn_unreliable(conn, ECOMM); | |
4056 | goto drop; | |
4057 | } | |
4058 | ||
d626f62b | 4059 | skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), |
e1027a7c | 4060 | skb->len); |
1da177e4 LT |
4061 | conn->rx_len -= skb->len; |
4062 | ||
4063 | if (!conn->rx_len) { | |
4064 | /* Complete frame received */ | |
4065 | l2cap_recv_frame(conn, conn->rx_skb); | |
4066 | conn->rx_skb = NULL; | |
4067 | } | |
4068 | } | |
4069 | ||
4070 | drop: | |
4071 | kfree_skb(skb); | |
4072 | return 0; | |
4073 | } | |
4074 | ||
aef7d97c | 4075 | static int l2cap_debugfs_show(struct seq_file *f, void *p) |
1da177e4 LT |
4076 | { |
4077 | struct sock *sk; | |
4078 | struct hlist_node *node; | |
1da177e4 LT |
4079 | |
4080 | read_lock_bh(&l2cap_sk_list.lock); | |
4081 | ||
be9d1227 MH |
4082 | sk_for_each(sk, node, &l2cap_sk_list.head) { |
4083 | struct l2cap_pinfo *pi = l2cap_pi(sk); | |
0c1bc5c6 | 4084 | struct l2cap_chan *chan = pi->chan; |
101545f6 | 4085 | |
903d343e | 4086 | seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n", |
aef7d97c MH |
4087 | batostr(&bt_sk(sk)->src), |
4088 | batostr(&bt_sk(sk)->dst), | |
4089 | sk->sk_state, __le16_to_cpu(pi->psm), | |
4090 | pi->scid, pi->dcid, | |
0c1bc5c6 GP |
4091 | chan->imtu, chan->omtu, chan->sec_level, |
4092 | chan->mode); | |
be9d1227 | 4093 | } |
1da177e4 | 4094 | |
1da177e4 | 4095 | read_unlock_bh(&l2cap_sk_list.lock); |
1da177e4 | 4096 | |
aef7d97c | 4097 | return 0; |
1da177e4 LT |
4098 | } |
4099 | ||
aef7d97c MH |
4100 | static int l2cap_debugfs_open(struct inode *inode, struct file *file) |
4101 | { | |
4102 | return single_open(file, l2cap_debugfs_show, inode->i_private); | |
4103 | } | |
4104 | ||
4105 | static const struct file_operations l2cap_debugfs_fops = { | |
4106 | .open = l2cap_debugfs_open, | |
4107 | .read = seq_read, | |
4108 | .llseek = seq_lseek, | |
4109 | .release = single_release, | |
4110 | }; | |
4111 | ||
4112 | static struct dentry *l2cap_debugfs; | |
1da177e4 | 4113 | |
1da177e4 LT |
4114 | static struct hci_proto l2cap_hci_proto = { |
4115 | .name = "L2CAP", | |
4116 | .id = HCI_PROTO_L2CAP, | |
4117 | .connect_ind = l2cap_connect_ind, | |
4118 | .connect_cfm = l2cap_connect_cfm, | |
4119 | .disconn_ind = l2cap_disconn_ind, | |
2950f21a | 4120 | .disconn_cfm = l2cap_disconn_cfm, |
8c1b2355 | 4121 | .security_cfm = l2cap_security_cfm, |
1da177e4 LT |
4122 | .recv_acldata = l2cap_recv_acldata |
4123 | }; | |
4124 | ||
64274518 | 4125 | int __init l2cap_init(void) |
1da177e4 LT |
4126 | { |
4127 | int err; | |
be9d1227 | 4128 | |
bb58f747 | 4129 | err = l2cap_init_sockets(); |
1da177e4 LT |
4130 | if (err < 0) |
4131 | return err; | |
4132 | ||
1890d36b | 4133 | _busy_wq = create_singlethread_workqueue("l2cap"); |
b78d7b4f | 4134 | if (!_busy_wq) { |
bb58f747 | 4135 | err = -ENOMEM; |
1da177e4 LT |
4136 | goto error; |
4137 | } | |
4138 | ||
4139 | err = hci_register_proto(&l2cap_hci_proto); | |
4140 | if (err < 0) { | |
4141 | BT_ERR("L2CAP protocol registration failed"); | |
4142 | bt_sock_unregister(BTPROTO_L2CAP); | |
4143 | goto error; | |
4144 | } | |
4145 | ||
aef7d97c MH |
4146 | if (bt_debugfs) { |
4147 | l2cap_debugfs = debugfs_create_file("l2cap", 0444, | |
4148 | bt_debugfs, NULL, &l2cap_debugfs_fops); | |
4149 | if (!l2cap_debugfs) | |
4150 | BT_ERR("Failed to create L2CAP debug file"); | |
4151 | } | |
1da177e4 | 4152 | |
1da177e4 LT |
4153 | return 0; |
4154 | ||
4155 | error: | |
b78d7b4f | 4156 | destroy_workqueue(_busy_wq); |
bb58f747 | 4157 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4158 | return err; |
4159 | } | |
4160 | ||
64274518 | 4161 | void l2cap_exit(void) |
1da177e4 | 4162 | { |
aef7d97c | 4163 | debugfs_remove(l2cap_debugfs); |
1da177e4 | 4164 | |
1890d36b GP |
4165 | flush_workqueue(_busy_wq); |
4166 | destroy_workqueue(_busy_wq); | |
4167 | ||
1da177e4 LT |
4168 | if (hci_unregister_proto(&l2cap_hci_proto) < 0) |
4169 | BT_ERR("L2CAP protocol unregistration failed"); | |
4170 | ||
bb58f747 | 4171 | l2cap_cleanup_sockets(); |
1da177e4 LT |
4172 | } |
4173 | ||
d1c4a17d GP |
4174 | module_param(disable_ertm, bool, 0644); |
4175 | MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode"); |