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> | |
38 | #include <net/sock.h> | |
39 | ||
40 | #include <linux/isdn/capilli.h> | |
41 | ||
42 | #include <net/bluetooth/bluetooth.h> | |
43 | #include <net/bluetooth/l2cap.h> | |
44 | ||
45 | #include "cmtp.h" | |
46 | ||
1da177e4 LT |
47 | #define VERSION "1.0" |
48 | ||
49 | static DECLARE_RWSEM(cmtp_session_sem); | |
50 | static LIST_HEAD(cmtp_session_list); | |
51 | ||
52 | static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr) | |
53 | { | |
54 | struct cmtp_session *session; | |
55 | struct list_head *p; | |
56 | ||
57 | BT_DBG(""); | |
58 | ||
59 | list_for_each(p, &cmtp_session_list) { | |
60 | session = list_entry(p, struct cmtp_session, list); | |
61 | if (!bacmp(bdaddr, &session->bdaddr)) | |
62 | return session; | |
63 | } | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | static void __cmtp_link_session(struct cmtp_session *session) | |
68 | { | |
69 | __module_get(THIS_MODULE); | |
70 | list_add(&session->list, &cmtp_session_list); | |
71 | } | |
72 | ||
73 | static void __cmtp_unlink_session(struct cmtp_session *session) | |
74 | { | |
75 | list_del(&session->list); | |
76 | module_put(THIS_MODULE); | |
77 | } | |
78 | ||
79 | static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci) | |
80 | { | |
81 | bacpy(&ci->bdaddr, &session->bdaddr); | |
82 | ||
83 | ci->flags = session->flags; | |
84 | ci->state = session->state; | |
85 | ||
86 | ci->num = session->num; | |
87 | } | |
88 | ||
89 | ||
90 | static inline int cmtp_alloc_block_id(struct cmtp_session *session) | |
91 | { | |
92 | int i, id = -1; | |
93 | ||
94 | for (i = 0; i < 16; i++) | |
95 | if (!test_and_set_bit(i, &session->blockids)) { | |
96 | id = i; | |
97 | break; | |
98 | } | |
99 | ||
100 | return id; | |
101 | } | |
102 | ||
103 | static inline void cmtp_free_block_id(struct cmtp_session *session, int id) | |
104 | { | |
105 | clear_bit(id, &session->blockids); | |
106 | } | |
107 | ||
108 | static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count) | |
109 | { | |
110 | struct sk_buff *skb = session->reassembly[id], *nskb; | |
111 | int size; | |
112 | ||
113 | BT_DBG("session %p buf %p count %d", session, buf, count); | |
114 | ||
115 | size = (skb) ? skb->len + count : count; | |
116 | ||
117 | if (!(nskb = alloc_skb(size, GFP_ATOMIC))) { | |
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: | |
181 | if (session->reassembly[id] != NULL) | |
182 | kfree_skb(session->reassembly[id]); | |
183 | session->reassembly[id] = NULL; | |
184 | break; | |
185 | } | |
186 | ||
187 | skb_pull(skb, hdrlen + len); | |
188 | } | |
189 | ||
190 | kfree_skb(skb); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len) | |
195 | { | |
196 | struct socket *sock = session->sock; | |
197 | struct kvec iv = { data, len }; | |
198 | struct msghdr msg; | |
199 | ||
200 | BT_DBG("session %p data %p len %d", session, data, len); | |
201 | ||
202 | if (!len) | |
203 | return 0; | |
204 | ||
205 | memset(&msg, 0, sizeof(msg)); | |
206 | ||
207 | return kernel_sendmsg(sock, &msg, &iv, 1, len); | |
208 | } | |
209 | ||
b03efcfb | 210 | static void cmtp_process_transmit(struct cmtp_session *session) |
1da177e4 LT |
211 | { |
212 | struct sk_buff *skb, *nskb; | |
213 | unsigned char *hdr; | |
214 | unsigned int size, tail; | |
215 | ||
216 | BT_DBG("session %p", session); | |
217 | ||
218 | if (!(nskb = alloc_skb(session->mtu, GFP_ATOMIC))) { | |
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 | ||
226 | if ((tail = (session->mtu - nskb->len)) < 5) { | |
227 | cmtp_send_frame(session, nskb->data, nskb->len); | |
228 | skb_trim(nskb, 0); | |
229 | tail = session->mtu; | |
230 | } | |
231 | ||
232 | size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len); | |
233 | ||
234 | if ((scb->id < 0) && ((scb->id = cmtp_alloc_block_id(session)) < 0)) { | |
235 | skb_queue_head(&session->transmit, skb); | |
236 | break; | |
237 | } | |
238 | ||
239 | if (size < 256) { | |
240 | hdr = skb_put(nskb, 2); | |
241 | hdr[0] = 0x40 | |
242 | | ((scb->id << 2) & 0x3c) | |
243 | | ((skb->len == size) ? 0x00 : 0x01); | |
244 | hdr[1] = size; | |
245 | } else { | |
246 | hdr = skb_put(nskb, 3); | |
247 | hdr[0] = 0x80 | |
248 | | ((scb->id << 2) & 0x3c) | |
249 | | ((skb->len == size) ? 0x00 : 0x01); | |
250 | hdr[1] = size & 0xff; | |
251 | hdr[2] = size >> 8; | |
252 | } | |
253 | ||
d626f62b | 254 | skb_copy_from_linear_data(skb, skb_put(nskb, size), size); |
1da177e4 LT |
255 | skb_pull(skb, size); |
256 | ||
257 | if (skb->len > 0) { | |
258 | skb_queue_head(&session->transmit, skb); | |
259 | } else { | |
260 | cmtp_free_block_id(session, scb->id); | |
261 | if (scb->data) { | |
262 | cmtp_send_frame(session, nskb->data, nskb->len); | |
263 | skb_trim(nskb, 0); | |
264 | } | |
265 | kfree_skb(skb); | |
266 | } | |
267 | } | |
268 | ||
269 | cmtp_send_frame(session, nskb->data, nskb->len); | |
270 | ||
271 | kfree_skb(nskb); | |
1da177e4 LT |
272 | } |
273 | ||
274 | static int cmtp_session(void *arg) | |
275 | { | |
276 | struct cmtp_session *session = arg; | |
277 | struct sock *sk = session->sock->sk; | |
278 | struct sk_buff *skb; | |
279 | wait_queue_t wait; | |
280 | ||
281 | BT_DBG("session %p", session); | |
282 | ||
283 | daemonize("kcmtpd_ctr_%d", session->num); | |
284 | set_user_nice(current, -15); | |
1da177e4 LT |
285 | |
286 | init_waitqueue_entry(&wait, current); | |
aa395145 | 287 | add_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
288 | while (!atomic_read(&session->terminate)) { |
289 | set_current_state(TASK_INTERRUPTIBLE); | |
290 | ||
291 | if (sk->sk_state != BT_CONNECTED) | |
292 | break; | |
293 | ||
294 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) { | |
295 | skb_orphan(skb); | |
296 | cmtp_recv_frame(session, skb); | |
297 | } | |
298 | ||
299 | cmtp_process_transmit(session); | |
300 | ||
301 | schedule(); | |
302 | } | |
303 | set_current_state(TASK_RUNNING); | |
aa395145 | 304 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
305 | |
306 | down_write(&cmtp_session_sem); | |
307 | ||
308 | if (!(session->flags & (1 << CMTP_LOOPBACK))) | |
309 | cmtp_detach_device(session); | |
310 | ||
311 | fput(session->sock->file); | |
312 | ||
313 | __cmtp_unlink_session(session); | |
314 | ||
315 | up_write(&cmtp_session_sem); | |
316 | ||
317 | kfree(session); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock) | |
322 | { | |
323 | struct cmtp_session *session, *s; | |
cb810a18 | 324 | bdaddr_t dst; |
1da177e4 LT |
325 | int i, err; |
326 | ||
327 | BT_DBG(""); | |
328 | ||
1da177e4 LT |
329 | baswap(&dst, &bt_sk(sock->sk)->dst); |
330 | ||
25ea6db0 | 331 | session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL); |
8e87d142 | 332 | if (!session) |
1da177e4 | 333 | return -ENOMEM; |
1da177e4 LT |
334 | |
335 | down_write(&cmtp_session_sem); | |
336 | ||
337 | s = __cmtp_get_session(&bt_sk(sock->sk)->dst); | |
338 | if (s && s->state == BT_CONNECTED) { | |
339 | err = -EEXIST; | |
340 | goto failed; | |
341 | } | |
342 | ||
343 | bacpy(&session->bdaddr, &bt_sk(sock->sk)->dst); | |
344 | ||
345 | session->mtu = min_t(uint, l2cap_pi(sock->sk)->omtu, l2cap_pi(sock->sk)->imtu); | |
346 | ||
347 | BT_DBG("mtu %d", session->mtu); | |
348 | ||
349 | sprintf(session->name, "%s", batostr(&dst)); | |
350 | ||
351 | session->sock = sock; | |
352 | session->state = BT_CONFIG; | |
353 | ||
354 | init_waitqueue_head(&session->wait); | |
355 | ||
356 | session->msgnum = CMTP_INITIAL_MSGNUM; | |
357 | ||
358 | INIT_LIST_HEAD(&session->applications); | |
359 | ||
360 | skb_queue_head_init(&session->transmit); | |
361 | ||
362 | for (i = 0; i < 16; i++) | |
363 | session->reassembly[i] = NULL; | |
364 | ||
365 | session->flags = req->flags; | |
366 | ||
367 | __cmtp_link_session(session); | |
368 | ||
369 | err = kernel_thread(cmtp_session, session, CLONE_KERNEL); | |
370 | if (err < 0) | |
371 | goto unlink; | |
372 | ||
373 | if (!(session->flags & (1 << CMTP_LOOPBACK))) { | |
374 | err = cmtp_attach_device(session); | |
375 | if (err < 0) | |
376 | goto detach; | |
377 | } | |
378 | ||
379 | up_write(&cmtp_session_sem); | |
380 | return 0; | |
381 | ||
382 | detach: | |
383 | cmtp_detach_device(session); | |
384 | ||
385 | unlink: | |
386 | __cmtp_unlink_session(session); | |
387 | ||
388 | failed: | |
389 | up_write(&cmtp_session_sem); | |
390 | kfree(session); | |
391 | return err; | |
392 | } | |
393 | ||
394 | int cmtp_del_connection(struct cmtp_conndel_req *req) | |
395 | { | |
396 | struct cmtp_session *session; | |
397 | int err = 0; | |
398 | ||
399 | BT_DBG(""); | |
400 | ||
401 | down_read(&cmtp_session_sem); | |
402 | ||
403 | session = __cmtp_get_session(&req->bdaddr); | |
404 | if (session) { | |
405 | /* Flush the transmit queue */ | |
406 | skb_queue_purge(&session->transmit); | |
407 | ||
408 | /* Kill session thread */ | |
409 | atomic_inc(&session->terminate); | |
410 | cmtp_schedule(session); | |
411 | } else | |
412 | err = -ENOENT; | |
413 | ||
414 | up_read(&cmtp_session_sem); | |
415 | return err; | |
416 | } | |
417 | ||
418 | int cmtp_get_connlist(struct cmtp_connlist_req *req) | |
419 | { | |
420 | struct list_head *p; | |
421 | int err = 0, n = 0; | |
422 | ||
423 | BT_DBG(""); | |
424 | ||
425 | down_read(&cmtp_session_sem); | |
426 | ||
427 | list_for_each(p, &cmtp_session_list) { | |
428 | struct cmtp_session *session; | |
429 | struct cmtp_conninfo ci; | |
430 | ||
431 | session = list_entry(p, struct cmtp_session, list); | |
432 | ||
433 | __cmtp_copy_session(session, &ci); | |
434 | ||
435 | if (copy_to_user(req->ci, &ci, sizeof(ci))) { | |
436 | err = -EFAULT; | |
437 | break; | |
438 | } | |
439 | ||
440 | if (++n >= req->cnum) | |
441 | break; | |
442 | ||
443 | req->ci++; | |
444 | } | |
445 | req->cnum = n; | |
446 | ||
447 | up_read(&cmtp_session_sem); | |
448 | return err; | |
449 | } | |
450 | ||
451 | int cmtp_get_conninfo(struct cmtp_conninfo *ci) | |
452 | { | |
453 | struct cmtp_session *session; | |
454 | int err = 0; | |
455 | ||
456 | down_read(&cmtp_session_sem); | |
457 | ||
458 | session = __cmtp_get_session(&ci->bdaddr); | |
459 | if (session) | |
460 | __cmtp_copy_session(session, ci); | |
461 | else | |
462 | err = -ENOENT; | |
463 | ||
464 | up_read(&cmtp_session_sem); | |
465 | return err; | |
466 | } | |
467 | ||
468 | ||
469 | static int __init cmtp_init(void) | |
470 | { | |
471 | l2cap_load(); | |
472 | ||
473 | BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION); | |
474 | ||
475 | cmtp_init_sockets(); | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | static void __exit cmtp_exit(void) | |
481 | { | |
482 | cmtp_cleanup_sockets(); | |
483 | } | |
484 | ||
485 | module_init(cmtp_init); | |
486 | module_exit(cmtp_exit); | |
487 | ||
488 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
489 | MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION); | |
490 | MODULE_VERSION(VERSION); | |
491 | MODULE_LICENSE("GPL"); | |
492 | MODULE_ALIAS("bt-proto-5"); |