2 CMTP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2002-2003 Marcel Holtmann <marcel@holtmann.org>
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;
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.
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.
23 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/errno.h>
27 #include <linux/kernel.h>
28 #include <linux/sched.h>
29 #include <linux/slab.h>
30 #include <linux/poll.h>
31 #include <linux/fcntl.h>
32 #include <linux/freezer.h>
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 <linux/kthread.h>
41 #include <linux/isdn/capilli.h>
43 #include <net/bluetooth/bluetooth.h>
44 #include <net/bluetooth/l2cap.h>
50 static DECLARE_RWSEM(cmtp_session_sem);
51 static LIST_HEAD(cmtp_session_list);
53 static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr)
55 struct cmtp_session *session;
59 list_for_each_entry(session, &cmtp_session_list, list)
60 if (!bacmp(bdaddr, &session->bdaddr))
66 static void __cmtp_link_session(struct cmtp_session *session)
68 list_add(&session->list, &cmtp_session_list);
71 static void __cmtp_unlink_session(struct cmtp_session *session)
73 list_del(&session->list);
76 static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci)
78 u32 valid_flags = BIT(CMTP_LOOPBACK);
79 memset(ci, 0, sizeof(*ci));
80 bacpy(&ci->bdaddr, &session->bdaddr);
82 ci->flags = session->flags & valid_flags;
83 ci->state = session->state;
85 ci->num = session->num;
89 static inline int cmtp_alloc_block_id(struct cmtp_session *session)
93 for (i = 0; i < 16; i++)
94 if (!test_and_set_bit(i, &session->blockids)) {
102 static inline void cmtp_free_block_id(struct cmtp_session *session, int id)
104 clear_bit(id, &session->blockids);
107 static inline void cmtp_add_msgpart(struct cmtp_session *session, int id, const unsigned char *buf, int count)
109 struct sk_buff *skb = session->reassembly[id], *nskb;
112 BT_DBG("session %p buf %p count %d", session, buf, count);
114 size = (skb) ? skb->len + count : count;
116 nskb = alloc_skb(size, GFP_ATOMIC);
118 BT_ERR("Can't allocate memory for CAPI message");
122 if (skb && (skb->len > 0))
123 skb_copy_from_linear_data(skb, skb_put(nskb, skb->len), skb->len);
125 skb_put_data(nskb, buf, count);
127 session->reassembly[id] = nskb;
132 static inline int cmtp_recv_frame(struct cmtp_session *session, struct sk_buff *skb)
134 __u8 hdr, hdrlen, id;
137 BT_DBG("session %p skb %p len %d", session, skb, skb->len);
139 while (skb->len > 0) {
142 switch (hdr & 0xc0) {
149 len = skb->data[1] | (skb->data[2] << 8);
157 id = (hdr & 0x3c) >> 2;
159 BT_DBG("hdr 0x%02x hdrlen %d len %d id %d", hdr, hdrlen, len, id);
161 if (hdrlen + len > skb->len) {
162 BT_ERR("Wrong size or header information in CMTP frame");
167 skb_pull(skb, hdrlen);
171 switch (hdr & 0x03) {
173 cmtp_add_msgpart(session, id, skb->data + hdrlen, len);
174 cmtp_recv_capimsg(session, session->reassembly[id]);
175 session->reassembly[id] = NULL;
178 cmtp_add_msgpart(session, id, skb->data + hdrlen, len);
181 kfree_skb(session->reassembly[id]);
182 session->reassembly[id] = NULL;
186 skb_pull(skb, hdrlen + len);
193 static int cmtp_send_frame(struct cmtp_session *session, unsigned char *data, int len)
195 struct socket *sock = session->sock;
196 struct kvec iv = { data, len };
199 BT_DBG("session %p data %p len %d", session, data, len);
204 memset(&msg, 0, sizeof(msg));
206 return kernel_sendmsg(sock, &msg, &iv, 1, len);
209 static void cmtp_process_transmit(struct cmtp_session *session)
211 struct sk_buff *skb, *nskb;
213 unsigned int size, tail;
215 BT_DBG("session %p", session);
217 nskb = alloc_skb(session->mtu, GFP_ATOMIC);
219 BT_ERR("Can't allocate memory for new frame");
223 while ((skb = skb_dequeue(&session->transmit))) {
224 struct cmtp_scb *scb = (void *) skb->cb;
226 tail = session->mtu - nskb->len;
228 cmtp_send_frame(session, nskb->data, nskb->len);
233 size = min_t(uint, ((tail < 258) ? (tail - 2) : (tail - 3)), skb->len);
236 scb->id = cmtp_alloc_block_id(session);
238 skb_queue_head(&session->transmit, skb);
244 hdr = skb_put(nskb, 2);
246 | ((scb->id << 2) & 0x3c)
247 | ((skb->len == size) ? 0x00 : 0x01);
250 hdr = skb_put(nskb, 3);
252 | ((scb->id << 2) & 0x3c)
253 | ((skb->len == size) ? 0x00 : 0x01);
254 hdr[1] = size & 0xff;
258 skb_copy_from_linear_data(skb, skb_put(nskb, size), size);
262 skb_queue_head(&session->transmit, skb);
264 cmtp_free_block_id(session, scb->id);
266 cmtp_send_frame(session, nskb->data, nskb->len);
273 cmtp_send_frame(session, nskb->data, nskb->len);
278 static int cmtp_session(void *arg)
280 struct cmtp_session *session = arg;
281 struct sock *sk = session->sock->sk;
283 DEFINE_WAIT_FUNC(wait, woken_wake_function);
285 BT_DBG("session %p", session);
287 set_user_nice(current, -15);
289 add_wait_queue(sk_sleep(sk), &wait);
291 if (atomic_read(&session->terminate))
293 if (sk->sk_state != BT_CONNECTED)
296 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
298 if (!skb_linearize(skb))
299 cmtp_recv_frame(session, skb);
304 cmtp_process_transmit(session);
307 * wait_woken() performs the necessary memory barriers
308 * for us; see the header comment for this primitive.
310 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
312 remove_wait_queue(sk_sleep(sk), &wait);
314 down_write(&cmtp_session_sem);
316 if (!(session->flags & BIT(CMTP_LOOPBACK)))
317 cmtp_detach_device(session);
319 fput(session->sock->file);
321 __cmtp_unlink_session(session);
323 up_write(&cmtp_session_sem);
326 module_put_and_kthread_exit(0);
330 int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock)
332 u32 valid_flags = BIT(CMTP_LOOPBACK);
333 struct cmtp_session *session, *s;
338 if (!l2cap_is_socket(sock))
341 if (req->flags & ~valid_flags)
344 session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
348 down_write(&cmtp_session_sem);
350 s = __cmtp_get_session(&l2cap_pi(sock->sk)->chan->dst);
351 if (s && s->state == BT_CONNECTED) {
356 bacpy(&session->bdaddr, &l2cap_pi(sock->sk)->chan->dst);
358 session->mtu = min_t(uint, l2cap_pi(sock->sk)->chan->omtu,
359 l2cap_pi(sock->sk)->chan->imtu);
361 BT_DBG("mtu %d", session->mtu);
363 sprintf(session->name, "%pMR", &session->bdaddr);
365 session->sock = sock;
366 session->state = BT_CONFIG;
368 init_waitqueue_head(&session->wait);
370 session->msgnum = CMTP_INITIAL_MSGNUM;
372 INIT_LIST_HEAD(&session->applications);
374 skb_queue_head_init(&session->transmit);
376 for (i = 0; i < 16; i++)
377 session->reassembly[i] = NULL;
379 session->flags = req->flags;
381 __cmtp_link_session(session);
383 __module_get(THIS_MODULE);
384 session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d",
386 if (IS_ERR(session->task)) {
387 module_put(THIS_MODULE);
388 err = PTR_ERR(session->task);
392 if (!(session->flags & BIT(CMTP_LOOPBACK))) {
393 err = cmtp_attach_device(session);
395 /* Caller will call fput in case of failure, and so
396 * will cmtp_session kthread.
398 get_file(session->sock->file);
400 atomic_inc(&session->terminate);
401 wake_up_interruptible(sk_sleep(session->sock->sk));
402 up_write(&cmtp_session_sem);
407 up_write(&cmtp_session_sem);
411 __cmtp_unlink_session(session);
414 up_write(&cmtp_session_sem);
419 int cmtp_del_connection(struct cmtp_conndel_req *req)
422 struct cmtp_session *session;
427 if (req->flags & ~valid_flags)
430 down_read(&cmtp_session_sem);
432 session = __cmtp_get_session(&req->bdaddr);
434 /* Flush the transmit queue */
435 skb_queue_purge(&session->transmit);
437 /* Stop session thread */
438 atomic_inc(&session->terminate);
441 * See the comment preceding the call to wait_woken()
444 wake_up_interruptible(sk_sleep(session->sock->sk));
448 up_read(&cmtp_session_sem);
452 int cmtp_get_connlist(struct cmtp_connlist_req *req)
454 struct cmtp_session *session;
459 down_read(&cmtp_session_sem);
461 list_for_each_entry(session, &cmtp_session_list, list) {
462 struct cmtp_conninfo ci;
464 __cmtp_copy_session(session, &ci);
466 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
471 if (++n >= req->cnum)
478 up_read(&cmtp_session_sem);
482 int cmtp_get_conninfo(struct cmtp_conninfo *ci)
484 struct cmtp_session *session;
487 down_read(&cmtp_session_sem);
489 session = __cmtp_get_session(&ci->bdaddr);
491 __cmtp_copy_session(session, ci);
495 up_read(&cmtp_session_sem);
500 static int __init cmtp_init(void)
502 BT_INFO("CMTP (CAPI Emulation) ver %s", VERSION);
504 return cmtp_init_sockets();
507 static void __exit cmtp_exit(void)
509 cmtp_cleanup_sockets();
512 module_init(cmtp_init);
513 module_exit(cmtp_exit);
515 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
516 MODULE_DESCRIPTION("Bluetooth CMTP ver " VERSION);
517 MODULE_VERSION(VERSION);
518 MODULE_LICENSE("GPL");
519 MODULE_ALIAS("bt-proto-5");