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 | { | |
3185fbd9 | 78 | memset(ci, 0, sizeof(*ci)); |
1da177e4 LT |
79 | bacpy(&ci->bdaddr, &session->bdaddr); |
80 | ||
81 | ci->flags = session->flags; | |
82 | ci->state = session->state; | |
83 | ||
84 | ci->num = session->num; | |
85 | } | |
86 | ||
87 | ||
88 | static inline int cmtp_alloc_block_id(struct cmtp_session *session) | |
89 | { | |
90 | int i, id = -1; | |
91 | ||
92 | for (i = 0; i < 16; i++) | |
93 | if (!test_and_set_bit(i, &session->blockids)) { | |
94 | id = i; | |
95 | break; | |
96 | } | |
97 | ||
98 | return id; | |
99 | } | |
100 | ||
101 | static inline void cmtp_free_block_id(struct cmtp_session *session, int id) | |
102 | { | |
103 | clear_bit(id, &session->blockids); | |
104 | } | |
105 | ||
106 | static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) | |
107 | { | |
108 | struct sk_buff *skb = session->reassembly[id], *nskb; | |
109 | int size; | |
110 | ||
111 | BT_DBG("session %p buf %p count %d", session, buf, count); | |
112 | ||
113 | size = (skb) ? skb->len + count : count; | |
114 | ||
5a08ecce AE |
115 | nskb = alloc_skb(size, GFP_ATOMIC); |
116 | if (!nskb) { | |
1da177e4 LT |
117 | BT_ERR("Can't allocate memory for CAPI message"); |
118 | return; | |
119 | } | |
120 | ||
121 | if (skb && (skb->len > 0)) | |
d626f62b | 122 | skb_copy_from_linear_data(skb, skb_put(nskb, skb->len), skb->len); |
1da177e4 LT |
123 | |
124 | memcpy(skb_put(nskb, count), buf, count); | |
125 | ||
126 | session->reassembly[id] = nskb; | |
127 | ||
7585b97a | 128 | kfree_skb(skb); |
1da177e4 LT |
129 | } |
130 | ||
131 | static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb) | |
132 | { | |
133 | __u8 hdr, hdrlen, id; | |
134 | __u16 len; | |
135 | ||
136 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
137 | ||
138 | while (skb->len > 0) { | |
139 | hdr = skb->data[0]; | |
140 | ||
141 | switch (hdr & 0xc0) { | |
142 | case 0x40: | |
143 | hdrlen = 2; | |
144 | len = skb->data[1]; | |
145 | break; | |
146 | case 0x80: | |
147 | hdrlen = 3; | |
148 | len = skb->data[1] | (skb->data[2] << 8); | |
149 | break; | |
150 | default: | |
151 | hdrlen = 1; | |
152 | len = 0; | |
153 | break; | |
154 | } | |
155 | ||
156 | id = (hdr & 0x3c) >> 2; | |
157 | ||
158 | BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id); | |
159 | ||
160 | if (hdrlen + len > skb->len) { | |
161 | BT_ERR("Wrong size or header information in CMTP frame"); | |
162 | break; | |
163 | } | |
164 | ||
165 | if (len == 0) { | |
166 | skb_pull(skb, hdrlen); | |
167 | continue; | |
168 | } | |
169 | ||
170 | switch (hdr & 0x03) { | |
171 | case 0x00: | |
172 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
173 | cmtp_recv_capimsg(session, session->reassembly[id]); | |
174 | session->reassembly[id] = NULL; | |
175 | break; | |
176 | case 0x01: | |
177 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
178 | break; | |
179 | default: | |
180 | if (session->reassembly[id] != NULL) | |
181 | kfree_skb(session->reassembly[id]); | |
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 | ||
316 | if (!(session->flags & (1 << CMTP_LOOPBACK))) | |
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 | { | |
332 | struct cmtp_session *session, *s; | |
1da177e4 LT |
333 | int i, err; |
334 | ||
335 | BT_DBG(""); | |
336 | ||
96c26653 AV |
337 | if (!l2cap_is_socket(sock)) |
338 | return -EBADFD; | |
339 | ||
25ea6db0 | 340 | session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL); |
8e87d142 | 341 | if (!session) |
1da177e4 | 342 | return -ENOMEM; |
1da177e4 LT |
343 | |
344 | down_write(&cmtp_session_sem); | |
345 | ||
88f1fd27 | 346 | s = __cmtp_get_session(&l2cap_pi(sock->sk)->chan->dst); |
1da177e4 LT |
347 | if (s && s->state == BT_CONNECTED) { |
348 | err = -EEXIST; | |
349 | goto failed; | |
350 | } | |
351 | ||
88f1fd27 | 352 | bacpy(&session->bdaddr, &l2cap_pi(sock->sk)->chan->dst); |
1da177e4 | 353 | |
0c1bc5c6 GP |
354 | session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu, |
355 | l2cap_pi(sock->sk)->chan->imtu); | |
1da177e4 LT |
356 | |
357 | BT_DBG("mtu %d", session->mtu); | |
358 | ||
88f1fd27 | 359 | sprintf(session->name, "%pMR", &session->bdaddr); |
1da177e4 LT |
360 | |
361 | session->sock = sock; | |
362 | session->state = BT_CONFIG; | |
363 | ||
364 | init_waitqueue_head(&session->wait); | |
365 | ||
366 | session->msgnum = CMTP_INITIAL_MSGNUM; | |
367 | ||
368 | INIT_LIST_HEAD(&session->applications); | |
369 | ||
370 | skb_queue_head_init(&session->transmit); | |
371 | ||
372 | for (i = 0; i < 16; i++) | |
373 | session->reassembly[i] = NULL; | |
374 | ||
375 | session->flags = req->flags; | |
376 | ||
377 | __cmtp_link_session(session); | |
378 | ||
48b28b8d | 379 | __module_get(THIS_MODULE); |
fada4ac3 SJ |
380 | session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", |
381 | session->num); | |
382 | if (IS_ERR(session->task)) { | |
48b28b8d | 383 | module_put(THIS_MODULE); |
fada4ac3 | 384 | err = PTR_ERR(session->task); |
1da177e4 | 385 | goto unlink; |
fada4ac3 | 386 | } |
1da177e4 LT |
387 | |
388 | if (!(session->flags & (1 << CMTP_LOOPBACK))) { | |
389 | err = cmtp_attach_device(session); | |
687beaa0 PH |
390 | if (err < 0) { |
391 | atomic_inc(&session->terminate); | |
392 | wake_up_process(session->task); | |
393 | up_write(&cmtp_session_sem); | |
394 | return err; | |
395 | } | |
1da177e4 LT |
396 | } |
397 | ||
398 | up_write(&cmtp_session_sem); | |
399 | return 0; | |
400 | ||
1da177e4 LT |
401 | unlink: |
402 | __cmtp_unlink_session(session); | |
403 | ||
404 | failed: | |
405 | up_write(&cmtp_session_sem); | |
406 | kfree(session); | |
407 | return err; | |
408 | } | |
409 | ||
410 | int cmtp_del_connection(struct cmtp_conndel_req *req) | |
411 | { | |
412 | struct cmtp_session *session; | |
413 | int err = 0; | |
414 | ||
415 | BT_DBG(""); | |
416 | ||
417 | down_read(&cmtp_session_sem); | |
418 | ||
419 | session = __cmtp_get_session(&req->bdaddr); | |
420 | if (session) { | |
421 | /* Flush the transmit queue */ | |
422 | skb_queue_purge(&session->transmit); | |
423 | ||
fada4ac3 | 424 | /* Stop session thread */ |
7176522c PH |
425 | atomic_inc(&session->terminate); |
426 | wake_up_process(session->task); | |
1da177e4 LT |
427 | } else |
428 | err = -ENOENT; | |
429 | ||
430 | up_read(&cmtp_session_sem); | |
431 | return err; | |
432 | } | |
433 | ||
434 | int cmtp_get_connlist(struct cmtp_connlist_req *req) | |
435 | { | |
8035ded4 | 436 | struct cmtp_session *session; |
1da177e4 LT |
437 | int err = 0, n = 0; |
438 | ||
439 | BT_DBG(""); | |
440 | ||
441 | down_read(&cmtp_session_sem); | |
442 | ||
8035ded4 | 443 | list_for_each_entry(session, &cmtp_session_list, list) { |
1da177e4 LT |
444 | struct cmtp_conninfo ci; |
445 | ||
1da177e4 LT |
446 | __cmtp_copy_session(session, &ci); |
447 | ||
448 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
449 | err = -EFAULT; | |
450 | break; | |
451 | } | |
452 | ||
453 | if (++n >= req->cnum) | |
454 | break; | |
455 | ||
456 | req->ci++; | |
457 | } | |
458 | req->cnum = n; | |
459 | ||
460 | up_read(&cmtp_session_sem); | |
461 | return err; | |
462 | } | |
463 | ||
464 | int cmtp_get_conninfo(struct cmtp_conninfo *ci) | |
465 | { | |
466 | struct cmtp_session *session; | |
467 | int err = 0; | |
468 | ||
469 | down_read(&cmtp_session_sem); | |
470 | ||
471 | session = __cmtp_get_session(&ci->bdaddr); | |
472 | if (session) | |
473 | __cmtp_copy_session(session, ci); | |
474 | else | |
475 | err = -ENOENT; | |
476 | ||
477 | up_read(&cmtp_session_sem); | |
478 | return err; | |
479 | } | |
480 | ||
481 | ||
482 | static int __init cmtp_init(void) | |
483 | { | |
1da177e4 LT |
484 | BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); |
485 | ||
486 | cmtp_init_sockets(); | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | static void __exit cmtp_exit(void) | |
492 | { | |
493 | cmtp_cleanup_sockets(); | |
494 | } | |
495 | ||
496 | module_init(cmtp_init); | |
497 | module_exit(cmtp_exit); | |
498 | ||
499 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
500 | MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); | |
501 | MODULE_VERSION(VERSION); | |
502 | MODULE_LICENSE("GPL"); | |
503 | MODULE_ALIAS("bt-proto-5"); |