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Commit | Line | Data |
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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; | |
56 | struct list_head *p; | |
57 | ||
58 | BT_DBG(""); | |
59 | ||
60 | list_for_each(p, &cmtp_session_list) { | |
61 | session = list_entry(p, struct cmtp_session, list); | |
62 | if (!bacmp(bdaddr, &session->bdaddr)) | |
63 | return session; | |
64 | } | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | static void __cmtp_link_session(struct cmtp_session *session) | |
69 | { | |
70 | __module_get(THIS_MODULE); | |
71 | list_add(&session->list, &cmtp_session_list); | |
72 | } | |
73 | ||
74 | static void __cmtp_unlink_session(struct cmtp_session *session) | |
75 | { | |
76 | list_del(&session->list); | |
77 | module_put(THIS_MODULE); | |
78 | } | |
79 | ||
80 | static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci) | |
81 | { | |
3185fbd9 | 82 | memset(ci, 0, sizeof(*ci)); |
1da177e4 LT |
83 | bacpy(&ci->bdaddr, &session->bdaddr); |
84 | ||
85 | ci->flags = session->flags; | |
86 | ci->state = session->state; | |
87 | ||
88 | ci->num = session->num; | |
89 | } | |
90 | ||
91 | ||
92 | static inline int cmtp_alloc_block_id(struct cmtp_session *session) | |
93 | { | |
94 | int i, id = -1; | |
95 | ||
96 | for (i = 0; i < 16; i++) | |
97 | if (!test_and_set_bit(i, &session->blockids)) { | |
98 | id = i; | |
99 | break; | |
100 | } | |
101 | ||
102 | return id; | |
103 | } | |
104 | ||
105 | static inline void cmtp_free_block_id(struct cmtp_session *session, int id) | |
106 | { | |
107 | clear_bit(id, &session->blockids); | |
108 | } | |
109 | ||
110 | static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) | |
111 | { | |
112 | struct sk_buff *skb = session->reassembly[id], *nskb; | |
113 | int size; | |
114 | ||
115 | BT_DBG("session %p buf %p count %d", session, buf, count); | |
116 | ||
117 | size = (skb) ? skb->len + count : count; | |
118 | ||
5a08ecce AE |
119 | nskb = alloc_skb(size, GFP_ATOMIC); |
120 | if (!nskb) { | |
1da177e4 LT |
121 | BT_ERR("Can't allocate memory for CAPI message"); |
122 | return; | |
123 | } | |
124 | ||
125 | if (skb && (skb->len > 0)) | |
d626f62b | 126 | skb_copy_from_linear_data(skb, skb_put(nskb, skb->len), skb->len); |
1da177e4 LT |
127 | |
128 | memcpy(skb_put(nskb, count), buf, count); | |
129 | ||
130 | session->reassembly[id] = nskb; | |
131 | ||
7585b97a | 132 | kfree_skb(skb); |
1da177e4 LT |
133 | } |
134 | ||
135 | static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb) | |
136 | { | |
137 | __u8 hdr, hdrlen, id; | |
138 | __u16 len; | |
139 | ||
140 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
141 | ||
142 | while (skb->len > 0) { | |
143 | hdr = skb->data[0]; | |
144 | ||
145 | switch (hdr & 0xc0) { | |
146 | case 0x40: | |
147 | hdrlen = 2; | |
148 | len = skb->data[1]; | |
149 | break; | |
150 | case 0x80: | |
151 | hdrlen = 3; | |
152 | len = skb->data[1] | (skb->data[2] << 8); | |
153 | break; | |
154 | default: | |
155 | hdrlen = 1; | |
156 | len = 0; | |
157 | break; | |
158 | } | |
159 | ||
160 | id = (hdr & 0x3c) >> 2; | |
161 | ||
162 | BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id); | |
163 | ||
164 | if (hdrlen + len > skb->len) { | |
165 | BT_ERR("Wrong size or header information in CMTP frame"); | |
166 | break; | |
167 | } | |
168 | ||
169 | if (len == 0) { | |
170 | skb_pull(skb, hdrlen); | |
171 | continue; | |
172 | } | |
173 | ||
174 | switch (hdr & 0x03) { | |
175 | case 0x00: | |
176 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
177 | cmtp_recv_capimsg(session, session->reassembly[id]); | |
178 | session->reassembly[id] = NULL; | |
179 | break; | |
180 | case 0x01: | |
181 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
182 | break; | |
183 | default: | |
184 | if (session->reassembly[id] != NULL) | |
185 | kfree_skb(session->reassembly[id]); | |
186 | session->reassembly[id] = NULL; | |
187 | break; | |
188 | } | |
189 | ||
190 | skb_pull(skb, hdrlen + len); | |
191 | } | |
192 | ||
193 | kfree_skb(skb); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len) | |
198 | { | |
199 | struct socket *sock = session->sock; | |
200 | struct kvec iv = { data, len }; | |
201 | struct msghdr msg; | |
202 | ||
203 | BT_DBG("session %p data %p len %d", session, data, len); | |
204 | ||
205 | if (!len) | |
206 | return 0; | |
207 | ||
208 | memset(&msg, 0, sizeof(msg)); | |
209 | ||
210 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
211 | } | |
212 | ||
b03efcfb | 213 | static void cmtp_process_transmit(struct cmtp_session *session) |
1da177e4 LT |
214 | { |
215 | struct sk_buff *skb, *nskb; | |
216 | unsigned char *hdr; | |
217 | unsigned int size, tail; | |
218 | ||
219 | BT_DBG("session %p", session); | |
220 | ||
5a08ecce AE |
221 | nskb = alloc_skb(session->mtu, GFP_ATOMIC); |
222 | if (!nskb) { | |
1da177e4 | 223 | BT_ERR("Can't allocate memory for new frame"); |
b03efcfb | 224 | return; |
1da177e4 LT |
225 | } |
226 | ||
227 | while ((skb = skb_dequeue(&session->transmit))) { | |
228 | struct cmtp_scb *scb = (void *) skb->cb; | |
229 | ||
5a08ecce AE |
230 | tail = session->mtu - nskb->len; |
231 | if (tail < 5) { | |
1da177e4 LT |
232 | cmtp_send_frame(session, nskb->data, nskb->len); |
233 | skb_trim(nskb, 0); | |
234 | tail = session->mtu; | |
235 | } | |
236 | ||
237 | size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len); | |
238 | ||
58aac468 SJ |
239 | if (scb->id < 0) { |
240 | scb->id = cmtp_alloc_block_id(session); | |
241 | if (scb->id < 0) { | |
242 | skb_queue_head(&session->transmit, skb); | |
243 | break; | |
244 | } | |
1da177e4 LT |
245 | } |
246 | ||
247 | if (size < 256) { | |
248 | hdr = skb_put(nskb, 2); | |
249 | hdr[0] = 0x40 | |
250 | | ((scb->id << 2) & 0x3c) | |
251 | | ((skb->len == size) ? 0x00 : 0x01); | |
252 | hdr[1] = size; | |
253 | } else { | |
254 | hdr = skb_put(nskb, 3); | |
255 | hdr[0] = 0x80 | |
256 | | ((scb->id << 2) & 0x3c) | |
257 | | ((skb->len == size) ? 0x00 : 0x01); | |
258 | hdr[1] = size & 0xff; | |
259 | hdr[2] = size >> 8; | |
260 | } | |
261 | ||
d626f62b | 262 | skb_copy_from_linear_data(skb, skb_put(nskb, size), size); |
1da177e4 LT |
263 | skb_pull(skb, size); |
264 | ||
265 | if (skb->len > 0) { | |
266 | skb_queue_head(&session->transmit, skb); | |
267 | } else { | |
268 | cmtp_free_block_id(session, scb->id); | |
269 | if (scb->data) { | |
270 | cmtp_send_frame(session, nskb->data, nskb->len); | |
271 | skb_trim(nskb, 0); | |
272 | } | |
273 | kfree_skb(skb); | |
274 | } | |
275 | } | |
276 | ||
277 | cmtp_send_frame(session, nskb->data, nskb->len); | |
278 | ||
279 | kfree_skb(nskb); | |
1da177e4 LT |
280 | } |
281 | ||
282 | static int cmtp_session(void *arg) | |
283 | { | |
284 | struct cmtp_session *session = arg; | |
285 | struct sock *sk = session->sock->sk; | |
286 | struct sk_buff *skb; | |
287 | wait_queue_t wait; | |
288 | ||
289 | BT_DBG("session %p", session); | |
290 | ||
1da177e4 | 291 | set_user_nice(current, -15); |
1da177e4 LT |
292 | |
293 | init_waitqueue_entry(&wait, current); | |
aa395145 | 294 | add_wait_queue(sk_sleep(sk), &wait); |
3a3f5c7d | 295 | while (1) { |
1da177e4 LT |
296 | set_current_state(TASK_INTERRUPTIBLE); |
297 | ||
7176522c | 298 | if (atomic_read(&session->terminate)) |
3a3f5c7d | 299 | break; |
1da177e4 LT |
300 | if (sk->sk_state != BT_CONNECTED) |
301 | break; | |
302 | ||
303 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
304 | skb_orphan(skb); | |
305 | cmtp_recv_frame(session, skb); | |
306 | } | |
307 | ||
308 | cmtp_process_transmit(session); | |
309 | ||
310 | schedule(); | |
311 | } | |
3a3f5c7d | 312 | __set_current_state(TASK_RUNNING); |
aa395145 | 313 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
314 | |
315 | down_write(&cmtp_session_sem); | |
316 | ||
317 | if (!(session->flags & (1 << CMTP_LOOPBACK))) | |
318 | cmtp_detach_device(session); | |
319 | ||
320 | fput(session->sock->file); | |
321 | ||
322 | __cmtp_unlink_session(session); | |
323 | ||
324 | up_write(&cmtp_session_sem); | |
325 | ||
326 | kfree(session); | |
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 | ||
25ea6db0 | 337 | session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL); |
8e87d142 | 338 | if (!session) |
1da177e4 | 339 | return -ENOMEM; |
1da177e4 LT |
340 | |
341 | down_write(&cmtp_session_sem); | |
342 | ||
343 | s = __cmtp_get_session(&bt_sk(sock->sk)->dst); | |
344 | if (s && s->state == BT_CONNECTED) { | |
345 | err = -EEXIST; | |
346 | goto failed; | |
347 | } | |
348 | ||
349 | bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst); | |
350 | ||
0c1bc5c6 GP |
351 | session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu, |
352 | l2cap_pi(sock->sk)->chan->imtu); | |
1da177e4 LT |
353 | |
354 | BT_DBG("mtu %d", session->mtu); | |
355 | ||
d6b2eb2f | 356 | sprintf(session->name, "%s", batostr(&bt_sk(sock->sk)->dst)); |
1da177e4 LT |
357 | |
358 | session->sock = sock; | |
359 | session->state = BT_CONFIG; | |
360 | ||
361 | init_waitqueue_head(&session->wait); | |
362 | ||
363 | session->msgnum = CMTP_INITIAL_MSGNUM; | |
364 | ||
365 | INIT_LIST_HEAD(&session->applications); | |
366 | ||
367 | skb_queue_head_init(&session->transmit); | |
368 | ||
369 | for (i = 0; i < 16; i++) | |
370 | session->reassembly[i] = NULL; | |
371 | ||
372 | session->flags = req->flags; | |
373 | ||
374 | __cmtp_link_session(session); | |
375 | ||
fada4ac3 SJ |
376 | session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", |
377 | session->num); | |
378 | if (IS_ERR(session->task)) { | |
379 | err = PTR_ERR(session->task); | |
1da177e4 | 380 | goto unlink; |
fada4ac3 | 381 | } |
1da177e4 LT |
382 | |
383 | if (!(session->flags & (1 << CMTP_LOOPBACK))) { | |
384 | err = cmtp_attach_device(session); | |
687beaa0 PH |
385 | if (err < 0) { |
386 | atomic_inc(&session->terminate); | |
387 | wake_up_process(session->task); | |
388 | up_write(&cmtp_session_sem); | |
389 | return err; | |
390 | } | |
1da177e4 LT |
391 | } |
392 | ||
393 | up_write(&cmtp_session_sem); | |
394 | return 0; | |
395 | ||
1da177e4 LT |
396 | unlink: |
397 | __cmtp_unlink_session(session); | |
398 | ||
399 | failed: | |
400 | up_write(&cmtp_session_sem); | |
401 | kfree(session); | |
402 | return err; | |
403 | } | |
404 | ||
405 | int cmtp_del_connection(struct cmtp_conndel_req *req) | |
406 | { | |
407 | struct cmtp_session *session; | |
408 | int err = 0; | |
409 | ||
410 | BT_DBG(""); | |
411 | ||
412 | down_read(&cmtp_session_sem); | |
413 | ||
414 | session = __cmtp_get_session(&req->bdaddr); | |
415 | if (session) { | |
416 | /* Flush the transmit queue */ | |
417 | skb_queue_purge(&session->transmit); | |
418 | ||
fada4ac3 | 419 | /* Stop session thread */ |
7176522c PH |
420 | atomic_inc(&session->terminate); |
421 | wake_up_process(session->task); | |
1da177e4 LT |
422 | } else |
423 | err = -ENOENT; | |
424 | ||
425 | up_read(&cmtp_session_sem); | |
426 | return err; | |
427 | } | |
428 | ||
429 | int cmtp_get_connlist(struct cmtp_connlist_req *req) | |
430 | { | |
431 | struct list_head *p; | |
432 | int err = 0, n = 0; | |
433 | ||
434 | BT_DBG(""); | |
435 | ||
436 | down_read(&cmtp_session_sem); | |
437 | ||
438 | list_for_each(p, &cmtp_session_list) { | |
439 | struct cmtp_session *session; | |
440 | struct cmtp_conninfo ci; | |
441 | ||
442 | session = list_entry(p, struct cmtp_session, list); | |
443 | ||
444 | __cmtp_copy_session(session, &ci); | |
445 | ||
446 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
447 | err = -EFAULT; | |
448 | break; | |
449 | } | |
450 | ||
451 | if (++n >= req->cnum) | |
452 | break; | |
453 | ||
454 | req->ci++; | |
455 | } | |
456 | req->cnum = n; | |
457 | ||
458 | up_read(&cmtp_session_sem); | |
459 | return err; | |
460 | } | |
461 | ||
462 | int cmtp_get_conninfo(struct cmtp_conninfo *ci) | |
463 | { | |
464 | struct cmtp_session *session; | |
465 | int err = 0; | |
466 | ||
467 | down_read(&cmtp_session_sem); | |
468 | ||
469 | session = __cmtp_get_session(&ci->bdaddr); | |
470 | if (session) | |
471 | __cmtp_copy_session(session, ci); | |
472 | else | |
473 | err = -ENOENT; | |
474 | ||
475 | up_read(&cmtp_session_sem); | |
476 | return err; | |
477 | } | |
478 | ||
479 | ||
480 | static int __init cmtp_init(void) | |
481 | { | |
1da177e4 LT |
482 | BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); |
483 | ||
484 | cmtp_init_sockets(); | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | static void __exit cmtp_exit(void) | |
490 | { | |
491 | cmtp_cleanup_sockets(); | |
492 | } | |
493 | ||
494 | module_init(cmtp_init); | |
495 | module_exit(cmtp_exit); | |
496 | ||
497 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
498 | MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); | |
499 | MODULE_VERSION(VERSION); | |
500 | MODULE_LICENSE("GPL"); | |
501 | MODULE_ALIAS("bt-proto-5"); |