xref: /openbmc/linux/net/bluetooth/bnep/core.c (revision 384740dc) 
1 /*
2    BNEP implementation for Linux Bluetooth stack (BlueZ).
3    Copyright (C) 2001-2002 Inventel Systemes
4    Written 2001-2002 by
5 	Clément Moreau <clement.moreau@inventel.fr>
6 	David Libault  <david.libault@inventel.fr>
7 
8    Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
9 
10    This program is free software; you can redistribute it and/or modify
11    it under the terms of the GNU General Public License version 2 as
12    published by the Free Software Foundation;
13 
14    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 
23    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25    SOFTWARE IS DISCLAIMED.
26 */
27 
28 #include <linux/module.h>
29 
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
32 #include <linux/signal.h>
33 #include <linux/init.h>
34 #include <linux/wait.h>
35 #include <linux/freezer.h>
36 #include <linux/errno.h>
37 #include <linux/net.h>
38 #include <net/sock.h>
39 
40 #include <linux/socket.h>
41 #include <linux/file.h>
42 
43 #include <linux/netdevice.h>
44 #include <linux/etherdevice.h>
45 #include <linux/skbuff.h>
46 
47 #include <asm/unaligned.h>
48 
49 #include <net/bluetooth/bluetooth.h>
50 #include <net/bluetooth/hci_core.h>
51 #include <net/bluetooth/l2cap.h>
52 
53 #include "bnep.h"
54 
55 #ifndef CONFIG_BT_BNEP_DEBUG
56 #undef  BT_DBG
57 #define BT_DBG(D...)
58 #endif
59 
60 #define VERSION "1.3"
61 
62 static int compress_src = 1;
63 static int compress_dst = 1;
64 
65 static LIST_HEAD(bnep_session_list);
66 static DECLARE_RWSEM(bnep_session_sem);
67 
68 static struct bnep_session *__bnep_get_session(u8 *dst)
69 {
70 	struct bnep_session *s;
71 	struct list_head *p;
72 
73 	BT_DBG("");
74 
75 	list_for_each(p, &bnep_session_list) {
76 		s = list_entry(p, struct bnep_session, list);
77 		if (!compare_ether_addr(dst, s->eh.h_source))
78 			return s;
79 	}
80 	return NULL;
81 }
82 
83 static void __bnep_link_session(struct bnep_session *s)
84 {
85 	/* It's safe to call __module_get() here because sessions are added
86 	   by the socket layer which has to hold the refference to this module.
87 	 */
88 	__module_get(THIS_MODULE);
89 	list_add(&s->list, &bnep_session_list);
90 }
91 
92 static void __bnep_unlink_session(struct bnep_session *s)
93 {
94 	list_del(&s->list);
95 	module_put(THIS_MODULE);
96 }
97 
98 static int bnep_send(struct bnep_session *s, void *data, size_t len)
99 {
100 	struct socket *sock = s->sock;
101 	struct kvec iv = { data, len };
102 
103 	return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
104 }
105 
106 static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
107 {
108 	struct bnep_control_rsp rsp;
109 	rsp.type = BNEP_CONTROL;
110 	rsp.ctrl = ctrl;
111 	rsp.resp = htons(resp);
112 	return bnep_send(s, &rsp, sizeof(rsp));
113 }
114 
115 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
116 static inline void bnep_set_default_proto_filter(struct bnep_session *s)
117 {
118 	/* (IPv4, ARP)  */
119 	s->proto_filter[0].start = ETH_P_IP;
120 	s->proto_filter[0].end   = ETH_P_ARP;
121 	/* (RARP, AppleTalk) */
122 	s->proto_filter[1].start = ETH_P_RARP;
123 	s->proto_filter[1].end   = ETH_P_AARP;
124 	/* (IPX, IPv6) */
125 	s->proto_filter[2].start = ETH_P_IPX;
126 	s->proto_filter[2].end   = ETH_P_IPV6;
127 }
128 #endif
129 
130 static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
131 {
132 	int n;
133 
134 	if (len < 2)
135 		return -EILSEQ;
136 
137 	n = get_unaligned_be16(data);
138 	data++; len -= 2;
139 
140 	if (len < n)
141 		return -EILSEQ;
142 
143 	BT_DBG("filter len %d", n);
144 
145 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
146 	n /= 4;
147 	if (n <= BNEP_MAX_PROTO_FILTERS) {
148 		struct bnep_proto_filter *f = s->proto_filter;
149 		int i;
150 
151 		for (i = 0; i < n; i++) {
152 			f[i].start = get_unaligned_be16(data++);
153 			f[i].end   = get_unaligned_be16(data++);
154 
155 			BT_DBG("proto filter start %d end %d",
156 				f[i].start, f[i].end);
157 		}
158 
159 		if (i < BNEP_MAX_PROTO_FILTERS)
160 			memset(f + i, 0, sizeof(*f));
161 
162 		if (n == 0)
163 			bnep_set_default_proto_filter(s);
164 
165 		bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
166 	} else {
167 		bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
168 	}
169 #else
170 	bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
171 #endif
172 	return 0;
173 }
174 
175 static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
176 {
177 	int n;
178 
179 	if (len < 2)
180 		return -EILSEQ;
181 
182 	n = get_unaligned_be16(data);
183 	data += 2; len -= 2;
184 
185 	if (len < n)
186 		return -EILSEQ;
187 
188 	BT_DBG("filter len %d", n);
189 
190 #ifdef CONFIG_BT_BNEP_MC_FILTER
191 	n /= (ETH_ALEN * 2);
192 
193 	if (n > 0) {
194 		s->mc_filter = 0;
195 
196 		/* Always send broadcast */
197 		set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
198 
199 		/* Add address ranges to the multicast hash */
200 		for (; n > 0; n--) {
201 			u8 a1[6], *a2;
202 
203 			memcpy(a1, data, ETH_ALEN); data += ETH_ALEN;
204 			a2 = data; data += ETH_ALEN;
205 
206 			BT_DBG("mc filter %s -> %s",
207 				batostr((void *) a1), batostr((void *) a2));
208 
209 			#define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }
210 
211 			/* Iterate from a1 to a2 */
212 			set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
213 			while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {
214 				INCA(a1);
215 				set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
216 			}
217 		}
218 	}
219 
220 	BT_DBG("mc filter hash 0x%llx", s->mc_filter);
221 
222 	bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
223 #else
224 	bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
225 #endif
226 	return 0;
227 }
228 
229 static int bnep_rx_control(struct bnep_session *s, void *data, int len)
230 {
231 	u8  cmd = *(u8 *)data;
232 	int err = 0;
233 
234 	data++; len--;
235 
236 	switch (cmd) {
237 	case BNEP_CMD_NOT_UNDERSTOOD:
238 	case BNEP_SETUP_CONN_REQ:
239 	case BNEP_SETUP_CONN_RSP:
240 	case BNEP_FILTER_NET_TYPE_RSP:
241 	case BNEP_FILTER_MULTI_ADDR_RSP:
242 		/* Ignore these for now */
243 		break;
244 
245 	case BNEP_FILTER_NET_TYPE_SET:
246 		err = bnep_ctrl_set_netfilter(s, data, len);
247 		break;
248 
249 	case BNEP_FILTER_MULTI_ADDR_SET:
250 		err = bnep_ctrl_set_mcfilter(s, data, len);
251 		break;
252 
253 	default: {
254 			u8 pkt[3];
255 			pkt[0] = BNEP_CONTROL;
256 			pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
257 			pkt[2] = cmd;
258 			bnep_send(s, pkt, sizeof(pkt));
259 		}
260 		break;
261 	}
262 
263 	return err;
264 }
265 
266 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
267 {
268 	struct bnep_ext_hdr *h;
269 	int err = 0;
270 
271 	do {
272 		h = (void *) skb->data;
273 		if (!skb_pull(skb, sizeof(*h))) {
274 			err = -EILSEQ;
275 			break;
276 		}
277 
278 		BT_DBG("type 0x%x len %d", h->type, h->len);
279 
280 		switch (h->type & BNEP_TYPE_MASK) {
281 		case BNEP_EXT_CONTROL:
282 			bnep_rx_control(s, skb->data, skb->len);
283 			break;
284 
285 		default:
286 			/* Unknown extension, skip it. */
287 			break;
288 		}
289 
290 		if (!skb_pull(skb, h->len)) {
291 			err = -EILSEQ;
292 			break;
293 		}
294 	} while (!err && (h->type & BNEP_EXT_HEADER));
295 
296 	return err;
297 }
298 
299 static u8 __bnep_rx_hlen[] = {
300 	ETH_HLEN,     /* BNEP_GENERAL */
301 	0,            /* BNEP_CONTROL */
302 	2,            /* BNEP_COMPRESSED */
303 	ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
304 	ETH_ALEN + 2  /* BNEP_COMPRESSED_DST_ONLY */
305 };
306 #define BNEP_RX_TYPES	(sizeof(__bnep_rx_hlen) - 1)
307 
308 static inline int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
309 {
310 	struct net_device *dev = s->dev;
311 	struct sk_buff *nskb;
312 	u8 type;
313 
314 	dev->last_rx = jiffies;
315 	s->stats.rx_bytes += skb->len;
316 
317 	type = *(u8 *) skb->data; skb_pull(skb, 1);
318 
319 	if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES)
320 		goto badframe;
321 
322 	if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
323 		bnep_rx_control(s, skb->data, skb->len);
324 		kfree_skb(skb);
325 		return 0;
326 	}
327 
328 	skb_reset_mac_header(skb);
329 
330 	/* Verify and pull out header */
331 	if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
332 		goto badframe;
333 
334 	s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
335 
336 	if (type & BNEP_EXT_HEADER) {
337 		if (bnep_rx_extension(s, skb) < 0)
338 			goto badframe;
339 	}
340 
341 	/* Strip 802.1p header */
342 	if (ntohs(s->eh.h_proto) == 0x8100) {
343 		if (!skb_pull(skb, 4))
344 			goto badframe;
345 		s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
346 	}
347 
348 	/* We have to alloc new skb and copy data here :(. Because original skb
349 	 * may not be modified and because of the alignment requirements. */
350 	nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
351 	if (!nskb) {
352 		s->stats.rx_dropped++;
353 		kfree_skb(skb);
354 		return -ENOMEM;
355 	}
356 	skb_reserve(nskb, 2);
357 
358 	/* Decompress header and construct ether frame */
359 	switch (type & BNEP_TYPE_MASK) {
360 	case BNEP_COMPRESSED:
361 		memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
362 		break;
363 
364 	case BNEP_COMPRESSED_SRC_ONLY:
365 		memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
366 		memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);
367 		put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
368 		break;
369 
370 	case BNEP_COMPRESSED_DST_ONLY:
371 		memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
372 		       ETH_ALEN);
373 		memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
374 		       ETH_ALEN + 2);
375 		break;
376 
377 	case BNEP_GENERAL:
378 		memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
379 		       ETH_ALEN * 2);
380 		put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
381 		break;
382 	}
383 
384 	skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
385 	kfree_skb(skb);
386 
387 	s->stats.rx_packets++;
388 	nskb->ip_summed = CHECKSUM_NONE;
389 	nskb->protocol  = eth_type_trans(nskb, dev);
390 	netif_rx_ni(nskb);
391 	return 0;
392 
393 badframe:
394 	s->stats.rx_errors++;
395 	kfree_skb(skb);
396 	return 0;
397 }
398 
399 static u8 __bnep_tx_types[] = {
400 	BNEP_GENERAL,
401 	BNEP_COMPRESSED_SRC_ONLY,
402 	BNEP_COMPRESSED_DST_ONLY,
403 	BNEP_COMPRESSED
404 };
405 
406 static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
407 {
408 	struct ethhdr *eh = (void *) skb->data;
409 	struct socket *sock = s->sock;
410 	struct kvec iv[3];
411 	int len = 0, il = 0;
412 	u8 type = 0;
413 
414 	BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
415 
416 	if (!skb->dev) {
417 		/* Control frame sent by us */
418 		goto send;
419 	}
420 
421 	iv[il++] = (struct kvec) { &type, 1 };
422 	len++;
423 
424 	if (compress_src && !compare_ether_addr(eh->h_dest, s->eh.h_source))
425 		type |= 0x01;
426 
427 	if (compress_dst && !compare_ether_addr(eh->h_source, s->eh.h_dest))
428 		type |= 0x02;
429 
430 	if (type)
431 		skb_pull(skb, ETH_ALEN * 2);
432 
433 	type = __bnep_tx_types[type];
434 	switch (type) {
435 	case BNEP_COMPRESSED_SRC_ONLY:
436 		iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
437 		len += ETH_ALEN;
438 		break;
439 
440 	case BNEP_COMPRESSED_DST_ONLY:
441 		iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
442 		len += ETH_ALEN;
443 		break;
444 	}
445 
446 send:
447 	iv[il++] = (struct kvec) { skb->data, skb->len };
448 	len += skb->len;
449 
450 	/* FIXME: linearize skb */
451 	{
452 		len = kernel_sendmsg(sock, &s->msg, iv, il, len);
453 	}
454 	kfree_skb(skb);
455 
456 	if (len > 0) {
457 		s->stats.tx_bytes += len;
458 		s->stats.tx_packets++;
459 		return 0;
460 	}
461 
462 	return len;
463 }
464 
465 static int bnep_session(void *arg)
466 {
467 	struct bnep_session *s = arg;
468 	struct net_device *dev = s->dev;
469 	struct sock *sk = s->sock->sk;
470 	struct sk_buff *skb;
471 	wait_queue_t wait;
472 
473 	BT_DBG("");
474 
475 	daemonize("kbnepd %s", dev->name);
476 	set_user_nice(current, -15);
477 
478 	init_waitqueue_entry(&wait, current);
479 	add_wait_queue(sk->sk_sleep, &wait);
480 	while (!atomic_read(&s->killed)) {
481 		set_current_state(TASK_INTERRUPTIBLE);
482 
483 		// RX
484 		while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
485 			skb_orphan(skb);
486 			bnep_rx_frame(s, skb);
487 		}
488 
489 		if (sk->sk_state != BT_CONNECTED)
490 			break;
491 
492 		// TX
493 		while ((skb = skb_dequeue(&sk->sk_write_queue)))
494 			if (bnep_tx_frame(s, skb))
495 				break;
496 		netif_wake_queue(dev);
497 
498 		schedule();
499 	}
500 	set_current_state(TASK_RUNNING);
501 	remove_wait_queue(sk->sk_sleep, &wait);
502 
503 	/* Cleanup session */
504 	down_write(&bnep_session_sem);
505 
506 	/* Delete network device */
507 	unregister_netdev(dev);
508 
509 	/* Wakeup user-space polling for socket errors */
510 	s->sock->sk->sk_err = EUNATCH;
511 
512 	wake_up_interruptible(s->sock->sk->sk_sleep);
513 
514 	/* Release the socket */
515 	fput(s->sock->file);
516 
517 	__bnep_unlink_session(s);
518 
519 	up_write(&bnep_session_sem);
520 	free_netdev(dev);
521 	return 0;
522 }
523 
524 static struct device *bnep_get_device(struct bnep_session *session)
525 {
526 	bdaddr_t *src = &bt_sk(session->sock->sk)->src;
527 	bdaddr_t *dst = &bt_sk(session->sock->sk)->dst;
528 	struct hci_dev *hdev;
529 	struct hci_conn *conn;
530 
531 	hdev = hci_get_route(dst, src);
532 	if (!hdev)
533 		return NULL;
534 
535 	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
536 
537 	hci_dev_put(hdev);
538 
539 	return conn ? &conn->dev : NULL;
540 }
541 
542 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
543 {
544 	struct net_device *dev;
545 	struct bnep_session *s, *ss;
546 	u8 dst[ETH_ALEN], src[ETH_ALEN];
547 	int err;
548 
549 	BT_DBG("");
550 
551 	baswap((void *) dst, &bt_sk(sock->sk)->dst);
552 	baswap((void *) src, &bt_sk(sock->sk)->src);
553 
554 	/* session struct allocated as private part of net_device */
555 	dev = alloc_netdev(sizeof(struct bnep_session),
556 			   (*req->device) ? req->device : "bnep%d",
557 			   bnep_net_setup);
558 	if (!dev)
559 		return -ENOMEM;
560 
561 	down_write(&bnep_session_sem);
562 
563 	ss = __bnep_get_session(dst);
564 	if (ss && ss->state == BT_CONNECTED) {
565 		err = -EEXIST;
566 		goto failed;
567 	}
568 
569 	s = dev->priv;
570 
571 	/* This is rx header therefore addresses are swapped.
572 	 * ie eh.h_dest is our local address. */
573 	memcpy(s->eh.h_dest,   &src, ETH_ALEN);
574 	memcpy(s->eh.h_source, &dst, ETH_ALEN);
575 	memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
576 
577 	s->dev   = dev;
578 	s->sock  = sock;
579 	s->role  = req->role;
580 	s->state = BT_CONNECTED;
581 
582 	s->msg.msg_flags = MSG_NOSIGNAL;
583 
584 #ifdef CONFIG_BT_BNEP_MC_FILTER
585 	/* Set default mc filter */
586 	set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
587 #endif
588 
589 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
590 	/* Set default protocol filter */
591 	bnep_set_default_proto_filter(s);
592 #endif
593 
594 	SET_NETDEV_DEV(dev, bnep_get_device(s));
595 
596 	err = register_netdev(dev);
597 	if (err) {
598 		goto failed;
599 	}
600 
601 	__bnep_link_session(s);
602 
603 	err = kernel_thread(bnep_session, s, CLONE_KERNEL);
604 	if (err < 0) {
605 		/* Session thread start failed, gotta cleanup. */
606 		unregister_netdev(dev);
607 		__bnep_unlink_session(s);
608 		goto failed;
609 	}
610 
611 	up_write(&bnep_session_sem);
612 	strcpy(req->device, dev->name);
613 	return 0;
614 
615 failed:
616 	up_write(&bnep_session_sem);
617 	free_netdev(dev);
618 	return err;
619 }
620 
621 int bnep_del_connection(struct bnep_conndel_req *req)
622 {
623 	struct bnep_session *s;
624 	int  err = 0;
625 
626 	BT_DBG("");
627 
628 	down_read(&bnep_session_sem);
629 
630 	s = __bnep_get_session(req->dst);
631 	if (s) {
632 		/* Wakeup user-space which is polling for socket errors.
633 		 * This is temporary hack untill we have shutdown in L2CAP */
634 		s->sock->sk->sk_err = EUNATCH;
635 
636 		/* Kill session thread */
637 		atomic_inc(&s->killed);
638 		wake_up_interruptible(s->sock->sk->sk_sleep);
639 	} else
640 		err = -ENOENT;
641 
642 	up_read(&bnep_session_sem);
643 	return err;
644 }
645 
646 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
647 {
648 	memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
649 	strcpy(ci->device, s->dev->name);
650 	ci->flags = s->flags;
651 	ci->state = s->state;
652 	ci->role  = s->role;
653 }
654 
655 int bnep_get_connlist(struct bnep_connlist_req *req)
656 {
657 	struct list_head *p;
658 	int err = 0, n = 0;
659 
660 	down_read(&bnep_session_sem);
661 
662 	list_for_each(p, &bnep_session_list) {
663 		struct bnep_session *s;
664 		struct bnep_conninfo ci;
665 
666 		s = list_entry(p, struct bnep_session, list);
667 
668 		__bnep_copy_ci(&ci, s);
669 
670 		if (copy_to_user(req->ci, &ci, sizeof(ci))) {
671 			err = -EFAULT;
672 			break;
673 		}
674 
675 		if (++n >= req->cnum)
676 			break;
677 
678 		req->ci++;
679 	}
680 	req->cnum = n;
681 
682 	up_read(&bnep_session_sem);
683 	return err;
684 }
685 
686 int bnep_get_conninfo(struct bnep_conninfo *ci)
687 {
688 	struct bnep_session *s;
689 	int err = 0;
690 
691 	down_read(&bnep_session_sem);
692 
693 	s = __bnep_get_session(ci->dst);
694 	if (s)
695 		__bnep_copy_ci(ci, s);
696 	else
697 		err = -ENOENT;
698 
699 	up_read(&bnep_session_sem);
700 	return err;
701 }
702 
703 static int __init bnep_init(void)
704 {
705 	char flt[50] = "";
706 
707 	l2cap_load();
708 
709 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
710 	strcat(flt, "protocol ");
711 #endif
712 
713 #ifdef CONFIG_BT_BNEP_MC_FILTER
714 	strcat(flt, "multicast");
715 #endif
716 
717 	BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
718 	if (flt[0])
719 		BT_INFO("BNEP filters: %s", flt);
720 
721 	bnep_sock_init();
722 	return 0;
723 }
724 
725 static void __exit bnep_exit(void)
726 {
727 	bnep_sock_cleanup();
728 }
729 
730 module_init(bnep_init);
731 module_exit(bnep_exit);
732 
733 module_param(compress_src, bool, 0644);
734 MODULE_PARM_DESC(compress_src, "Compress sources headers");
735 
736 module_param(compress_dst, bool, 0644);
737 MODULE_PARM_DESC(compress_dst, "Compress destination headers");
738 
739 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
740 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
741 MODULE_VERSION(VERSION);
742 MODULE_LICENSE("GPL");
743 MODULE_ALIAS("bt-proto-4");
744