Commit | Line | Data |
---|---|---|
8e87d142 | 1 | /* |
1da177e4 LT |
2 | CMTP implementation for Linux Bluetooth stack (BlueZ). |
3 | Copyright (C) 2002-2003 Marcel Holtmann <marcel@holtmann.org> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
8e87d142 YH |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
1da177e4 LT |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | ||
8e87d142 YH |
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
20 | SOFTWARE IS DISCLAIMED. |
21 | */ | |
22 | ||
1da177e4 LT |
23 | #include <linux/module.h> |
24 | ||
25 | #include <linux/types.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/kernel.h> | |
1da177e4 LT |
28 | #include <linux/sched.h> |
29 | #include <linux/slab.h> | |
30 | #include <linux/poll.h> | |
31 | #include <linux/fcntl.h> | |
83144186 | 32 | #include <linux/freezer.h> |
1da177e4 LT |
33 | #include <linux/skbuff.h> |
34 | #include <linux/socket.h> | |
35 | #include <linux/ioctl.h> | |
36 | #include <linux/file.h> | |
37 | #include <linux/init.h> | |
fada4ac3 | 38 | #include <linux/kthread.h> |
1da177e4 LT |
39 | #include <net/sock.h> |
40 | ||
41 | #include <linux/isdn/capilli.h> | |
42 | ||
43 | #include <net/bluetooth/bluetooth.h> | |
44 | #include <net/bluetooth/l2cap.h> | |
45 | ||
46 | #include "cmtp.h" | |
47 | ||
1da177e4 LT |
48 | #define VERSION "1.0" |
49 | ||
50 | static DECLARE_RWSEM(cmtp_session_sem); | |
51 | static LIST_HEAD(cmtp_session_list); | |
52 | ||
53 | static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr) | |
54 | { | |
55 | struct cmtp_session *session; | |
1da177e4 LT |
56 | |
57 | BT_DBG(""); | |
58 | ||
8035ded4 | 59 | list_for_each_entry(session, &cmtp_session_list, list) |
1da177e4 LT |
60 | if (!bacmp(bdaddr, &session->bdaddr)) |
61 | return session; | |
8035ded4 | 62 | |
1da177e4 LT |
63 | return NULL; |
64 | } | |
65 | ||
66 | static void __cmtp_link_session(struct cmtp_session *session) | |
67 | { | |
1da177e4 LT |
68 | list_add(&session->list, &cmtp_session_list); |
69 | } | |
70 | ||
71 | static void __cmtp_unlink_session(struct cmtp_session *session) | |
72 | { | |
73 | list_del(&session->list); | |
1da177e4 LT |
74 | } |
75 | ||
76 | static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci) | |
77 | { | |
8bf17a36 | 78 | u32 valid_flags = BIT(CMTP_LOOPBACK); |
3185fbd9 | 79 | memset(ci, 0, sizeof(*ci)); |
1da177e4 LT |
80 | bacpy(&ci->bdaddr, &session->bdaddr); |
81 | ||
8bf17a36 | 82 | ci->flags = session->flags & valid_flags; |
1da177e4 LT |
83 | ci->state = session->state; |
84 | ||
85 | ci->num = session->num; | |
86 | } | |
87 | ||
88 | ||
89 | static inline int cmtp_alloc_block_id(struct cmtp_session *session) | |
90 | { | |
91 | int i, id = -1; | |
92 | ||
93 | for (i = 0; i < 16; i++) | |
94 | if (!test_and_set_bit(i, &session->blockids)) { | |
95 | id = i; | |
96 | break; | |
97 | } | |
98 | ||
99 | return id; | |
100 | } | |
101 | ||
102 | static inline void cmtp_free_block_id(struct cmtp_session *session, int id) | |
103 | { | |
104 | clear_bit(id, &session->blockids); | |
105 | } | |
106 | ||
107 | static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) | |
108 | { | |
109 | struct sk_buff *skb = session->reassembly[id], *nskb; | |
110 | int size; | |
111 | ||
112 | BT_DBG("session %p buf %p count %d", session, buf, count); | |
113 | ||
114 | size = (skb) ? skb->len + count : count; | |
115 | ||
5a08ecce AE |
116 | nskb = alloc_skb(size, GFP_ATOMIC); |
117 | if (!nskb) { | |
1da177e4 LT |
118 | BT_ERR("Can't allocate memory for CAPI message"); |
119 | return; | |
120 | } | |
121 | ||
122 | if (skb && (skb->len > 0)) | |
d626f62b | 123 | skb_copy_from_linear_data(skb, skb_put(nskb, skb->len), skb->len); |
1da177e4 LT |
124 | |
125 | memcpy(skb_put(nskb, count), buf, count); | |
126 | ||
127 | session->reassembly[id] = nskb; | |
128 | ||
7585b97a | 129 | kfree_skb(skb); |
1da177e4 LT |
130 | } |
131 | ||
132 | static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb) | |
133 | { | |
134 | __u8 hdr, hdrlen, id; | |
135 | __u16 len; | |
136 | ||
137 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
138 | ||
139 | while (skb->len > 0) { | |
140 | hdr = skb->data[0]; | |
141 | ||
142 | switch (hdr & 0xc0) { | |
143 | case 0x40: | |
144 | hdrlen = 2; | |
145 | len = skb->data[1]; | |
146 | break; | |
147 | case 0x80: | |
148 | hdrlen = 3; | |
149 | len = skb->data[1] | (skb->data[2] << 8); | |
150 | break; | |
151 | default: | |
152 | hdrlen = 1; | |
153 | len = 0; | |
154 | break; | |
155 | } | |
156 | ||
157 | id = (hdr & 0x3c) >> 2; | |
158 | ||
159 | BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id); | |
160 | ||
161 | if (hdrlen + len > skb->len) { | |
162 | BT_ERR("Wrong size or header information in CMTP frame"); | |
163 | break; | |
164 | } | |
165 | ||
166 | if (len == 0) { | |
167 | skb_pull(skb, hdrlen); | |
168 | continue; | |
169 | } | |
170 | ||
171 | switch (hdr & 0x03) { | |
172 | case 0x00: | |
173 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
174 | cmtp_recv_capimsg(session, session->reassembly[id]); | |
175 | session->reassembly[id] = NULL; | |
176 | break; | |
177 | case 0x01: | |
178 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
179 | break; | |
180 | default: | |
06fbb3d5 | 181 | kfree_skb(session->reassembly[id]); |
1da177e4 LT |
182 | session->reassembly[id] = NULL; |
183 | break; | |
184 | } | |
185 | ||
186 | skb_pull(skb, hdrlen + len); | |
187 | } | |
188 | ||
189 | kfree_skb(skb); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len) | |
194 | { | |
195 | struct socket *sock = session->sock; | |
196 | struct kvec iv = { data, len }; | |
197 | struct msghdr msg; | |
198 | ||
199 | BT_DBG("session %p data %p len %d", session, data, len); | |
200 | ||
201 | if (!len) | |
202 | return 0; | |
203 | ||
204 | memset(&msg, 0, sizeof(msg)); | |
205 | ||
206 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
207 | } | |
208 | ||
b03efcfb | 209 | static void cmtp_process_transmit(struct cmtp_session *session) |
1da177e4 LT |
210 | { |
211 | struct sk_buff *skb, *nskb; | |
212 | unsigned char *hdr; | |
213 | unsigned int size, tail; | |
214 | ||
215 | BT_DBG("session %p", session); | |
216 | ||
5a08ecce AE |
217 | nskb = alloc_skb(session->mtu, GFP_ATOMIC); |
218 | if (!nskb) { | |
1da177e4 | 219 | BT_ERR("Can't allocate memory for new frame"); |
b03efcfb | 220 | return; |
1da177e4 LT |
221 | } |
222 | ||
223 | while ((skb = skb_dequeue(&session->transmit))) { | |
224 | struct cmtp_scb *scb = (void *) skb->cb; | |
225 | ||
5a08ecce AE |
226 | tail = session->mtu - nskb->len; |
227 | if (tail < 5) { | |
1da177e4 LT |
228 | cmtp_send_frame(session, nskb->data, nskb->len); |
229 | skb_trim(nskb, 0); | |
230 | tail = session->mtu; | |
231 | } | |
232 | ||
233 | size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len); | |
234 | ||
58aac468 SJ |
235 | if (scb->id < 0) { |
236 | scb->id = cmtp_alloc_block_id(session); | |
237 | if (scb->id < 0) { | |
238 | skb_queue_head(&session->transmit, skb); | |
239 | break; | |
240 | } | |
1da177e4 LT |
241 | } |
242 | ||
243 | if (size < 256) { | |
244 | hdr = skb_put(nskb, 2); | |
245 | hdr[0] = 0x40 | |
246 | | ((scb->id << 2) & 0x3c) | |
247 | | ((skb->len == size) ? 0x00 : 0x01); | |
248 | hdr[1] = size; | |
249 | } else { | |
250 | hdr = skb_put(nskb, 3); | |
251 | hdr[0] = 0x80 | |
252 | | ((scb->id << 2) & 0x3c) | |
253 | | ((skb->len == size) ? 0x00 : 0x01); | |
254 | hdr[1] = size & 0xff; | |
255 | hdr[2] = size >> 8; | |
256 | } | |
257 | ||
d626f62b | 258 | skb_copy_from_linear_data(skb, skb_put(nskb, size), size); |
1da177e4 LT |
259 | skb_pull(skb, size); |
260 | ||
261 | if (skb->len > 0) { | |
262 | skb_queue_head(&session->transmit, skb); | |
263 | } else { | |
264 | cmtp_free_block_id(session, scb->id); | |
265 | if (scb->data) { | |
266 | cmtp_send_frame(session, nskb->data, nskb->len); | |
267 | skb_trim(nskb, 0); | |
268 | } | |
269 | kfree_skb(skb); | |
270 | } | |
271 | } | |
272 | ||
273 | cmtp_send_frame(session, nskb->data, nskb->len); | |
274 | ||
275 | kfree_skb(nskb); | |
1da177e4 LT |
276 | } |
277 | ||
278 | static int cmtp_session(void *arg) | |
279 | { | |
280 | struct cmtp_session *session = arg; | |
281 | struct sock *sk = session->sock->sk; | |
282 | struct sk_buff *skb; | |
283 | wait_queue_t wait; | |
284 | ||
285 | BT_DBG("session %p", session); | |
286 | ||
1da177e4 | 287 | set_user_nice(current, -15); |
1da177e4 LT |
288 | |
289 | init_waitqueue_entry(&wait, current); | |
aa395145 | 290 | add_wait_queue(sk_sleep(sk), &wait); |
3a3f5c7d | 291 | while (1) { |
1da177e4 LT |
292 | set_current_state(TASK_INTERRUPTIBLE); |
293 | ||
7176522c | 294 | if (atomic_read(&session->terminate)) |
3a3f5c7d | 295 | break; |
1da177e4 LT |
296 | if (sk->sk_state != BT_CONNECTED) |
297 | break; | |
298 | ||
299 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
300 | skb_orphan(skb); | |
44935720 MM |
301 | if (!skb_linearize(skb)) |
302 | cmtp_recv_frame(session, skb); | |
303 | else | |
304 | kfree_skb(skb); | |
1da177e4 LT |
305 | } |
306 | ||
307 | cmtp_process_transmit(session); | |
308 | ||
309 | schedule(); | |
310 | } | |
3a3f5c7d | 311 | __set_current_state(TASK_RUNNING); |
aa395145 | 312 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
313 | |
314 | down_write(&cmtp_session_sem); | |
315 | ||
b2ddeb11 | 316 | if (!(session->flags & BIT(CMTP_LOOPBACK))) |
1da177e4 LT |
317 | cmtp_detach_device(session); |
318 | ||
319 | fput(session->sock->file); | |
320 | ||
321 | __cmtp_unlink_session(session); | |
322 | ||
323 | up_write(&cmtp_session_sem); | |
324 | ||
325 | kfree(session); | |
48b28b8d | 326 | module_put_and_exit(0); |
1da177e4 LT |
327 | return 0; |
328 | } | |
329 | ||
330 | int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock) | |
331 | { | |
8bf17a36 | 332 | u32 valid_flags = BIT(CMTP_LOOPBACK); |
1da177e4 | 333 | struct cmtp_session *session, *s; |
1da177e4 LT |
334 | int i, err; |
335 | ||
336 | BT_DBG(""); | |
337 | ||
96c26653 AV |
338 | if (!l2cap_is_socket(sock)) |
339 | return -EBADFD; | |
340 | ||
8bf17a36 MH |
341 | if (req->flags & ~valid_flags) |
342 | return -EINVAL; | |
343 | ||
25ea6db0 | 344 | session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL); |
8e87d142 | 345 | if (!session) |
1da177e4 | 346 | return -ENOMEM; |
1da177e4 LT |
347 | |
348 | down_write(&cmtp_session_sem); | |
349 | ||
88f1fd27 | 350 | s = __cmtp_get_session(&l2cap_pi(sock->sk)->chan->dst); |
1da177e4 LT |
351 | if (s && s->state == BT_CONNECTED) { |
352 | err = -EEXIST; | |
353 | goto failed; | |
354 | } | |
355 | ||
88f1fd27 | 356 | bacpy(&session->bdaddr, &l2cap_pi(sock->sk)->chan->dst); |
1da177e4 | 357 | |
0c1bc5c6 GP |
358 | session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu, |
359 | l2cap_pi(sock->sk)->chan->imtu); | |
1da177e4 LT |
360 | |
361 | BT_DBG("mtu %d", session->mtu); | |
362 | ||
88f1fd27 | 363 | sprintf(session->name, "%pMR", &session->bdaddr); |
1da177e4 LT |
364 | |
365 | session->sock = sock; | |
366 | session->state = BT_CONFIG; | |
367 | ||
368 | init_waitqueue_head(&session->wait); | |
369 | ||
370 | session->msgnum = CMTP_INITIAL_MSGNUM; | |
371 | ||
372 | INIT_LIST_HEAD(&session->applications); | |
373 | ||
374 | skb_queue_head_init(&session->transmit); | |
375 | ||
376 | for (i = 0; i < 16; i++) | |
377 | session->reassembly[i] = NULL; | |
378 | ||
379 | session->flags = req->flags; | |
380 | ||
381 | __cmtp_link_session(session); | |
382 | ||
48b28b8d | 383 | __module_get(THIS_MODULE); |
fada4ac3 SJ |
384 | session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", |
385 | session->num); | |
386 | if (IS_ERR(session->task)) { | |
48b28b8d | 387 | module_put(THIS_MODULE); |
fada4ac3 | 388 | err = PTR_ERR(session->task); |
1da177e4 | 389 | goto unlink; |
fada4ac3 | 390 | } |
1da177e4 | 391 | |
b2ddeb11 | 392 | if (!(session->flags & BIT(CMTP_LOOPBACK))) { |
1da177e4 | 393 | err = cmtp_attach_device(session); |
687beaa0 PH |
394 | if (err < 0) { |
395 | atomic_inc(&session->terminate); | |
396 | wake_up_process(session->task); | |
397 | up_write(&cmtp_session_sem); | |
398 | return err; | |
399 | } | |
1da177e4 LT |
400 | } |
401 | ||
402 | up_write(&cmtp_session_sem); | |
403 | return 0; | |
404 | ||
1da177e4 LT |
405 | unlink: |
406 | __cmtp_unlink_session(session); | |
407 | ||
408 | failed: | |
409 | up_write(&cmtp_session_sem); | |
410 | kfree(session); | |
411 | return err; | |
412 | } | |
413 | ||
414 | int cmtp_del_connection(struct cmtp_conndel_req *req) | |
415 | { | |
8bf17a36 | 416 | u32 valid_flags = 0; |
1da177e4 LT |
417 | struct cmtp_session *session; |
418 | int err = 0; | |
419 | ||
420 | BT_DBG(""); | |
421 | ||
8bf17a36 MH |
422 | if (req->flags & ~valid_flags) |
423 | return -EINVAL; | |
424 | ||
1da177e4 LT |
425 | down_read(&cmtp_session_sem); |
426 | ||
427 | session = __cmtp_get_session(&req->bdaddr); | |
428 | if (session) { | |
429 | /* Flush the transmit queue */ | |
430 | skb_queue_purge(&session->transmit); | |
431 | ||
fada4ac3 | 432 | /* Stop session thread */ |
7176522c PH |
433 | atomic_inc(&session->terminate); |
434 | wake_up_process(session->task); | |
1da177e4 LT |
435 | } else |
436 | err = -ENOENT; | |
437 | ||
438 | up_read(&cmtp_session_sem); | |
439 | return err; | |
440 | } | |
441 | ||
442 | int cmtp_get_connlist(struct cmtp_connlist_req *req) | |
443 | { | |
8035ded4 | 444 | struct cmtp_session *session; |
1da177e4 LT |
445 | int err = 0, n = 0; |
446 | ||
447 | BT_DBG(""); | |
448 | ||
449 | down_read(&cmtp_session_sem); | |
450 | ||
8035ded4 | 451 | list_for_each_entry(session, &cmtp_session_list, list) { |
1da177e4 LT |
452 | struct cmtp_conninfo ci; |
453 | ||
1da177e4 LT |
454 | __cmtp_copy_session(session, &ci); |
455 | ||
456 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
457 | err = -EFAULT; | |
458 | break; | |
459 | } | |
460 | ||
461 | if (++n >= req->cnum) | |
462 | break; | |
463 | ||
464 | req->ci++; | |
465 | } | |
466 | req->cnum = n; | |
467 | ||
468 | up_read(&cmtp_session_sem); | |
469 | return err; | |
470 | } | |
471 | ||
472 | int cmtp_get_conninfo(struct cmtp_conninfo *ci) | |
473 | { | |
474 | struct cmtp_session *session; | |
475 | int err = 0; | |
476 | ||
477 | down_read(&cmtp_session_sem); | |
478 | ||
479 | session = __cmtp_get_session(&ci->bdaddr); | |
480 | if (session) | |
481 | __cmtp_copy_session(session, ci); | |
482 | else | |
483 | err = -ENOENT; | |
484 | ||
485 | up_read(&cmtp_session_sem); | |
486 | return err; | |
487 | } | |
488 | ||
489 | ||
490 | static int __init cmtp_init(void) | |
491 | { | |
1da177e4 LT |
492 | BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); |
493 | ||
494 | cmtp_init_sockets(); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static void __exit cmtp_exit(void) | |
500 | { | |
501 | cmtp_cleanup_sockets(); | |
502 | } | |
503 | ||
504 | module_init(cmtp_init); | |
505 | module_exit(cmtp_exit); | |
506 | ||
507 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
508 | MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); | |
509 | MODULE_VERSION(VERSION); | |
510 | MODULE_LICENSE("GPL"); | |
511 | MODULE_ALIAS("bt-proto-5"); |