Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | |
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 | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
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> | |
32 | #include <linux/skbuff.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/ioctl.h> | |
35 | #include <linux/file.h> | |
36 | #include <linux/init.h> | |
37 | #include <net/sock.h> | |
38 | ||
39 | #include <linux/isdn/capilli.h> | |
40 | ||
41 | #include <net/bluetooth/bluetooth.h> | |
42 | #include <net/bluetooth/l2cap.h> | |
43 | ||
44 | #include "cmtp.h" | |
45 | ||
46 | #ifndef CONFIG_BT_CMTP_DEBUG | |
47 | #undef BT_DBG | |
48 | #define BT_DBG(D...) | |
49 | #endif | |
50 | ||
51 | #define VERSION "1.0" | |
52 | ||
53 | static DECLARE_RWSEM(cmtp_session_sem); | |
54 | static LIST_HEAD(cmtp_session_list); | |
55 | ||
56 | static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr) | |
57 | { | |
58 | struct cmtp_session *session; | |
59 | struct list_head *p; | |
60 | ||
61 | BT_DBG(""); | |
62 | ||
63 | list_for_each(p, &cmtp_session_list) { | |
64 | session = list_entry(p, struct cmtp_session, list); | |
65 | if (!bacmp(bdaddr, &session->bdaddr)) | |
66 | return session; | |
67 | } | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | static void __cmtp_link_session(struct cmtp_session *session) | |
72 | { | |
73 | __module_get(THIS_MODULE); | |
74 | list_add(&session->list, &cmtp_session_list); | |
75 | } | |
76 | ||
77 | static void __cmtp_unlink_session(struct cmtp_session *session) | |
78 | { | |
79 | list_del(&session->list); | |
80 | module_put(THIS_MODULE); | |
81 | } | |
82 | ||
83 | static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci) | |
84 | { | |
85 | bacpy(&ci->bdaddr, &session->bdaddr); | |
86 | ||
87 | ci->flags = session->flags; | |
88 | ci->state = session->state; | |
89 | ||
90 | ci->num = session->num; | |
91 | } | |
92 | ||
93 | ||
94 | static inline int cmtp_alloc_block_id(struct cmtp_session *session) | |
95 | { | |
96 | int i, id = -1; | |
97 | ||
98 | for (i = 0; i < 16; i++) | |
99 | if (!test_and_set_bit(i, &session->blockids)) { | |
100 | id = i; | |
101 | break; | |
102 | } | |
103 | ||
104 | return id; | |
105 | } | |
106 | ||
107 | static inline void cmtp_free_block_id(struct cmtp_session *session, int id) | |
108 | { | |
109 | clear_bit(id, &session->blockids); | |
110 | } | |
111 | ||
112 | static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) | |
113 | { | |
114 | struct sk_buff *skb = session->reassembly[id], *nskb; | |
115 | int size; | |
116 | ||
117 | BT_DBG("session %p buf %p count %d", session, buf, count); | |
118 | ||
119 | size = (skb) ? skb->len + count : count; | |
120 | ||
121 | if (!(nskb = alloc_skb(size, GFP_ATOMIC))) { | |
122 | BT_ERR("Can't allocate memory for CAPI message"); | |
123 | return; | |
124 | } | |
125 | ||
126 | if (skb && (skb->len > 0)) | |
127 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); | |
128 | ||
129 | memcpy(skb_put(nskb, count), buf, count); | |
130 | ||
131 | session->reassembly[id] = nskb; | |
132 | ||
133 | if (skb) | |
134 | kfree_skb(skb); | |
135 | } | |
136 | ||
137 | static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb) | |
138 | { | |
139 | __u8 hdr, hdrlen, id; | |
140 | __u16 len; | |
141 | ||
142 | BT_DBG("session %p skb %p len %d", session, skb, skb->len); | |
143 | ||
144 | while (skb->len > 0) { | |
145 | hdr = skb->data[0]; | |
146 | ||
147 | switch (hdr & 0xc0) { | |
148 | case 0x40: | |
149 | hdrlen = 2; | |
150 | len = skb->data[1]; | |
151 | break; | |
152 | case 0x80: | |
153 | hdrlen = 3; | |
154 | len = skb->data[1] | (skb->data[2] << 8); | |
155 | break; | |
156 | default: | |
157 | hdrlen = 1; | |
158 | len = 0; | |
159 | break; | |
160 | } | |
161 | ||
162 | id = (hdr & 0x3c) >> 2; | |
163 | ||
164 | BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id); | |
165 | ||
166 | if (hdrlen + len > skb->len) { | |
167 | BT_ERR("Wrong size or header information in CMTP frame"); | |
168 | break; | |
169 | } | |
170 | ||
171 | if (len == 0) { | |
172 | skb_pull(skb, hdrlen); | |
173 | continue; | |
174 | } | |
175 | ||
176 | switch (hdr & 0x03) { | |
177 | case 0x00: | |
178 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
179 | cmtp_recv_capimsg(session, session->reassembly[id]); | |
180 | session->reassembly[id] = NULL; | |
181 | break; | |
182 | case 0x01: | |
183 | cmtp_add_msgpart(session, id, skb->data + hdrlen, len); | |
184 | break; | |
185 | default: | |
186 | if (session->reassembly[id] != NULL) | |
187 | kfree_skb(session->reassembly[id]); | |
188 | session->reassembly[id] = NULL; | |
189 | break; | |
190 | } | |
191 | ||
192 | skb_pull(skb, hdrlen + len); | |
193 | } | |
194 | ||
195 | kfree_skb(skb); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len) | |
200 | { | |
201 | struct socket *sock = session->sock; | |
202 | struct kvec iv = { data, len }; | |
203 | struct msghdr msg; | |
204 | ||
205 | BT_DBG("session %p data %p len %d", session, data, len); | |
206 | ||
207 | if (!len) | |
208 | return 0; | |
209 | ||
210 | memset(&msg, 0, sizeof(msg)); | |
211 | ||
212 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
213 | } | |
214 | ||
b03efcfb | 215 | static void cmtp_process_transmit(struct cmtp_session *session) |
1da177e4 LT |
216 | { |
217 | struct sk_buff *skb, *nskb; | |
218 | unsigned char *hdr; | |
219 | unsigned int size, tail; | |
220 | ||
221 | BT_DBG("session %p", session); | |
222 | ||
223 | if (!(nskb = alloc_skb(session->mtu, GFP_ATOMIC))) { | |
224 | BT_ERR("Can't allocate memory for new frame"); | |
b03efcfb | 225 | return; |
1da177e4 LT |
226 | } |
227 | ||
228 | while ((skb = skb_dequeue(&session->transmit))) { | |
229 | struct cmtp_scb *scb = (void *) skb->cb; | |
230 | ||
231 | if ((tail = (session->mtu - nskb->len)) < 5) { | |
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 | ||
239 | if ((scb->id < 0) && ((scb->id = cmtp_alloc_block_id(session)) < 0)) { | |
240 | skb_queue_head(&session->transmit, skb); | |
241 | break; | |
242 | } | |
243 | ||
244 | if (size < 256) { | |
245 | hdr = skb_put(nskb, 2); | |
246 | hdr[0] = 0x40 | |
247 | | ((scb->id << 2) & 0x3c) | |
248 | | ((skb->len == size) ? 0x00 : 0x01); | |
249 | hdr[1] = size; | |
250 | } else { | |
251 | hdr = skb_put(nskb, 3); | |
252 | hdr[0] = 0x80 | |
253 | | ((scb->id << 2) & 0x3c) | |
254 | | ((skb->len == size) ? 0x00 : 0x01); | |
255 | hdr[1] = size & 0xff; | |
256 | hdr[2] = size >> 8; | |
257 | } | |
258 | ||
259 | memcpy(skb_put(nskb, size), skb->data, size); | |
260 | skb_pull(skb, size); | |
261 | ||
262 | if (skb->len > 0) { | |
263 | skb_queue_head(&session->transmit, skb); | |
264 | } else { | |
265 | cmtp_free_block_id(session, scb->id); | |
266 | if (scb->data) { | |
267 | cmtp_send_frame(session, nskb->data, nskb->len); | |
268 | skb_trim(nskb, 0); | |
269 | } | |
270 | kfree_skb(skb); | |
271 | } | |
272 | } | |
273 | ||
274 | cmtp_send_frame(session, nskb->data, nskb->len); | |
275 | ||
276 | kfree_skb(nskb); | |
1da177e4 LT |
277 | } |
278 | ||
279 | static int cmtp_session(void *arg) | |
280 | { | |
281 | struct cmtp_session *session = arg; | |
282 | struct sock *sk = session->sock->sk; | |
283 | struct sk_buff *skb; | |
284 | wait_queue_t wait; | |
285 | ||
286 | BT_DBG("session %p", session); | |
287 | ||
288 | daemonize("kcmtpd_ctr_%d", session->num); | |
289 | set_user_nice(current, -15); | |
290 | current->flags |= PF_NOFREEZE; | |
291 | ||
292 | init_waitqueue_entry(&wait, current); | |
293 | add_wait_queue(sk->sk_sleep, &wait); | |
294 | while (!atomic_read(&session->terminate)) { | |
295 | set_current_state(TASK_INTERRUPTIBLE); | |
296 | ||
297 | if (sk->sk_state != BT_CONNECTED) | |
298 | break; | |
299 | ||
300 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
301 | skb_orphan(skb); | |
302 | cmtp_recv_frame(session, skb); | |
303 | } | |
304 | ||
305 | cmtp_process_transmit(session); | |
306 | ||
307 | schedule(); | |
308 | } | |
309 | set_current_state(TASK_RUNNING); | |
310 | remove_wait_queue(sk->sk_sleep, &wait); | |
311 | ||
312 | down_write(&cmtp_session_sem); | |
313 | ||
314 | if (!(session->flags & (1 << CMTP_LOOPBACK))) | |
315 | cmtp_detach_device(session); | |
316 | ||
317 | fput(session->sock->file); | |
318 | ||
319 | __cmtp_unlink_session(session); | |
320 | ||
321 | up_write(&cmtp_session_sem); | |
322 | ||
323 | kfree(session); | |
324 | return 0; | |
325 | } | |
326 | ||
327 | int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock) | |
328 | { | |
329 | struct cmtp_session *session, *s; | |
330 | bdaddr_t src, dst; | |
331 | int i, err; | |
332 | ||
333 | BT_DBG(""); | |
334 | ||
335 | baswap(&src, &bt_sk(sock->sk)->src); | |
336 | baswap(&dst, &bt_sk(sock->sk)->dst); | |
337 | ||
25ea6db0 | 338 | session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL); |
1da177e4 LT |
339 | if (!session) |
340 | return -ENOMEM; | |
1da177e4 LT |
341 | |
342 | down_write(&cmtp_session_sem); | |
343 | ||
344 | s = __cmtp_get_session(&bt_sk(sock->sk)->dst); | |
345 | if (s && s->state == BT_CONNECTED) { | |
346 | err = -EEXIST; | |
347 | goto failed; | |
348 | } | |
349 | ||
350 | bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst); | |
351 | ||
352 | session->mtu = min_t(uint, l2cap_pi(sock->sk)->omtu, l2cap_pi(sock->sk)->imtu); | |
353 | ||
354 | BT_DBG("mtu %d", session->mtu); | |
355 | ||
356 | sprintf(session->name, "%s", batostr(&dst)); | |
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 | ||
376 | err = kernel_thread(cmtp_session, session, CLONE_KERNEL); | |
377 | if (err < 0) | |
378 | goto unlink; | |
379 | ||
380 | if (!(session->flags & (1 << CMTP_LOOPBACK))) { | |
381 | err = cmtp_attach_device(session); | |
382 | if (err < 0) | |
383 | goto detach; | |
384 | } | |
385 | ||
386 | up_write(&cmtp_session_sem); | |
387 | return 0; | |
388 | ||
389 | detach: | |
390 | cmtp_detach_device(session); | |
391 | ||
392 | unlink: | |
393 | __cmtp_unlink_session(session); | |
394 | ||
395 | failed: | |
396 | up_write(&cmtp_session_sem); | |
397 | kfree(session); | |
398 | return err; | |
399 | } | |
400 | ||
401 | int cmtp_del_connection(struct cmtp_conndel_req *req) | |
402 | { | |
403 | struct cmtp_session *session; | |
404 | int err = 0; | |
405 | ||
406 | BT_DBG(""); | |
407 | ||
408 | down_read(&cmtp_session_sem); | |
409 | ||
410 | session = __cmtp_get_session(&req->bdaddr); | |
411 | if (session) { | |
412 | /* Flush the transmit queue */ | |
413 | skb_queue_purge(&session->transmit); | |
414 | ||
415 | /* Kill session thread */ | |
416 | atomic_inc(&session->terminate); | |
417 | cmtp_schedule(session); | |
418 | } else | |
419 | err = -ENOENT; | |
420 | ||
421 | up_read(&cmtp_session_sem); | |
422 | return err; | |
423 | } | |
424 | ||
425 | int cmtp_get_connlist(struct cmtp_connlist_req *req) | |
426 | { | |
427 | struct list_head *p; | |
428 | int err = 0, n = 0; | |
429 | ||
430 | BT_DBG(""); | |
431 | ||
432 | down_read(&cmtp_session_sem); | |
433 | ||
434 | list_for_each(p, &cmtp_session_list) { | |
435 | struct cmtp_session *session; | |
436 | struct cmtp_conninfo ci; | |
437 | ||
438 | session = list_entry(p, struct cmtp_session, list); | |
439 | ||
440 | __cmtp_copy_session(session, &ci); | |
441 | ||
442 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
443 | err = -EFAULT; | |
444 | break; | |
445 | } | |
446 | ||
447 | if (++n >= req->cnum) | |
448 | break; | |
449 | ||
450 | req->ci++; | |
451 | } | |
452 | req->cnum = n; | |
453 | ||
454 | up_read(&cmtp_session_sem); | |
455 | return err; | |
456 | } | |
457 | ||
458 | int cmtp_get_conninfo(struct cmtp_conninfo *ci) | |
459 | { | |
460 | struct cmtp_session *session; | |
461 | int err = 0; | |
462 | ||
463 | down_read(&cmtp_session_sem); | |
464 | ||
465 | session = __cmtp_get_session(&ci->bdaddr); | |
466 | if (session) | |
467 | __cmtp_copy_session(session, ci); | |
468 | else | |
469 | err = -ENOENT; | |
470 | ||
471 | up_read(&cmtp_session_sem); | |
472 | return err; | |
473 | } | |
474 | ||
475 | ||
476 | static int __init cmtp_init(void) | |
477 | { | |
478 | l2cap_load(); | |
479 | ||
480 | BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); | |
481 | ||
482 | cmtp_init_sockets(); | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | static void __exit cmtp_exit(void) | |
488 | { | |
489 | cmtp_cleanup_sockets(); | |
490 | } | |
491 | ||
492 | module_init(cmtp_init); | |
493 | module_exit(cmtp_exit); | |
494 | ||
495 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
496 | MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); | |
497 | MODULE_VERSION(VERSION); | |
498 | MODULE_LICENSE("GPL"); | |
499 | MODULE_ALIAS("bt-proto-5"); |