xref: /openbmc/linux/net/bluetooth/bnep/core.c (revision 96de0e252cedffad61b3cb5e05662c591898e69a) 
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 /*
29  * $Id: core.c,v 1.20 2002/08/04 21:23:58 maxk Exp $
30  */
31 
32 #include <linux/module.h>
33 
34 #include <linux/kernel.h>
35 #include <linux/sched.h>
36 #include <linux/signal.h>
37 #include <linux/init.h>
38 #include <linux/wait.h>
39 #include <linux/freezer.h>
40 #include <linux/errno.h>
41 #include <linux/net.h>
42 #include <net/sock.h>
43 
44 #include <linux/socket.h>
45 #include <linux/file.h>
46 
47 #include <linux/netdevice.h>
48 #include <linux/etherdevice.h>
49 #include <linux/skbuff.h>
50 
51 #include <asm/unaligned.h>
52 
53 #include <net/bluetooth/bluetooth.h>
54 #include <net/bluetooth/hci_core.h>
55 #include <net/bluetooth/l2cap.h>
56 
57 #include "bnep.h"
58 
59 #ifndef CONFIG_BT_BNEP_DEBUG
60 #undef  BT_DBG
61 #define BT_DBG(D...)
62 #endif
63 
64 #define VERSION "1.2"
65 
66 static LIST_HEAD(bnep_session_list);
67 static DECLARE_RWSEM(bnep_session_sem);
68 
69 static struct bnep_session *__bnep_get_session(u8 *dst)
70 {
71 	struct bnep_session *s;
72 	struct list_head *p;
73 
74 	BT_DBG("");
75 
76 	list_for_each(p, &bnep_session_list) {
77 		s = list_entry(p, struct bnep_session, list);
78 		if (!compare_ether_addr(dst, s->eh.h_source))
79 			return s;
80 	}
81 	return NULL;
82 }
83 
84 static void __bnep_link_session(struct bnep_session *s)
85 {
86 	/* It's safe to call __module_get() here because sessions are added
87 	   by the socket layer which has to hold the refference to this module.
88 	 */
89 	__module_get(THIS_MODULE);
90 	list_add(&s->list, &bnep_session_list);
91 }
92 
93 static void __bnep_unlink_session(struct bnep_session *s)
94 {
95 	list_del(&s->list);
96 	module_put(THIS_MODULE);
97 }
98 
99 static int bnep_send(struct bnep_session *s, void *data, size_t len)
100 {
101 	struct socket *sock = s->sock;
102 	struct kvec iv = { data, len };
103 
104 	return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
105 }
106 
107 static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
108 {
109 	struct bnep_control_rsp rsp;
110 	rsp.type = BNEP_CONTROL;
111 	rsp.ctrl = ctrl;
112 	rsp.resp = htons(resp);
113 	return bnep_send(s, &rsp, sizeof(rsp));
114 }
115 
116 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
117 static inline void bnep_set_default_proto_filter(struct bnep_session *s)
118 {
119 	/* (IPv4, ARP)  */
120 	s->proto_filter[0].start = ETH_P_IP;
121 	s->proto_filter[0].end   = ETH_P_ARP;
122 	/* (RARP, AppleTalk) */
123 	s->proto_filter[1].start = ETH_P_RARP;
124 	s->proto_filter[1].end   = ETH_P_AARP;
125 	/* (IPX, IPv6) */
126 	s->proto_filter[2].start = ETH_P_IPX;
127 	s->proto_filter[2].end   = ETH_P_IPV6;
128 }
129 #endif
130 
131 static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
132 {
133 	int n;
134 
135 	if (len < 2)
136 		return -EILSEQ;
137 
138 	n = ntohs(get_unaligned(data));
139 	data++; len -= 2;
140 
141 	if (len < n)
142 		return -EILSEQ;
143 
144 	BT_DBG("filter len %d", n);
145 
146 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
147 	n /= 4;
148 	if (n <= BNEP_MAX_PROTO_FILTERS) {
149 		struct bnep_proto_filter *f = s->proto_filter;
150 		int i;
151 
152 		for (i = 0; i < n; i++) {
153 			f[i].start = ntohs(get_unaligned(data++));
154 			f[i].end   = ntohs(get_unaligned(data++));
155 
156 			BT_DBG("proto filter start %d end %d",
157 				f[i].start, f[i].end);
158 		}
159 
160 		if (i < BNEP_MAX_PROTO_FILTERS)
161 			memset(f + i, 0, sizeof(*f));
162 
163 		if (n == 0)
164 			bnep_set_default_proto_filter(s);
165 
166 		bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
167 	} else {
168 		bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
169 	}
170 #else
171 	bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
172 #endif
173 	return 0;
174 }
175 
176 static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
177 {
178 	int n;
179 
180 	if (len < 2)
181 		return -EILSEQ;
182 
183 	n = ntohs(get_unaligned((__be16 *) data));
184 	data += 2; len -= 2;
185 
186 	if (len < n)
187 		return -EILSEQ;
188 
189 	BT_DBG("filter len %d", n);
190 
191 #ifdef CONFIG_BT_BNEP_MC_FILTER
192 	n /= (ETH_ALEN * 2);
193 
194 	if (n > 0) {
195 		s->mc_filter = 0;
196 
197 		/* Always send broadcast */
198 		set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
199 
200 		/* Add address ranges to the multicast hash */
201 		for (; n > 0; n--) {
202 			u8 a1[6], *a2;
203 
204 			memcpy(a1, data, ETH_ALEN); data += ETH_ALEN;
205 			a2 = data; data += ETH_ALEN;
206 
207 			BT_DBG("mc filter %s -> %s",
208 				batostr((void *) a1), batostr((void *) a2));
209 
210 			#define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }
211 
212 			/* Iterate from a1 to a2 */
213 			set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
214 			while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {
215 				INCA(a1);
216 				set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
217 			}
218 		}
219 	}
220 
221 	BT_DBG("mc filter hash 0x%llx", s->mc_filter);
222 
223 	bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
224 #else
225 	bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
226 #endif
227 	return 0;
228 }
229 
230 static int bnep_rx_control(struct bnep_session *s, void *data, int len)
231 {
232 	u8  cmd = *(u8 *)data;
233 	int err = 0;
234 
235 	data++; len--;
236 
237 	switch (cmd) {
238 	case BNEP_CMD_NOT_UNDERSTOOD:
239 	case BNEP_SETUP_CONN_REQ:
240 	case BNEP_SETUP_CONN_RSP:
241 	case BNEP_FILTER_NET_TYPE_RSP:
242 	case BNEP_FILTER_MULTI_ADDR_RSP:
243 		/* Ignore these for now */
244 		break;
245 
246 	case BNEP_FILTER_NET_TYPE_SET:
247 		err = bnep_ctrl_set_netfilter(s, data, len);
248 		break;
249 
250 	case BNEP_FILTER_MULTI_ADDR_SET:
251 		err = bnep_ctrl_set_mcfilter(s, data, len);
252 		break;
253 
254 	default: {
255 			u8 pkt[3];
256 			pkt[0] = BNEP_CONTROL;
257 			pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
258 			pkt[2] = cmd;
259 			bnep_send(s, pkt, sizeof(pkt));
260 		}
261 		break;
262 	}
263 
264 	return err;
265 }
266 
267 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
268 {
269 	struct bnep_ext_hdr *h;
270 	int err = 0;
271 
272 	do {
273 		h = (void *) skb->data;
274 		if (!skb_pull(skb, sizeof(*h))) {
275 			err = -EILSEQ;
276 			break;
277 		}
278 
279 		BT_DBG("type 0x%x len %d", h->type, h->len);
280 
281 		switch (h->type & BNEP_TYPE_MASK) {
282 		case BNEP_EXT_CONTROL:
283 			bnep_rx_control(s, skb->data, skb->len);
284 			break;
285 
286 		default:
287 			/* Unknown extension, skip it. */
288 			break;
289 		}
290 
291 		if (!skb_pull(skb, h->len)) {
292 			err = -EILSEQ;
293 			break;
294 		}
295 	} while (!err && (h->type & BNEP_EXT_HEADER));
296 
297 	return err;
298 }
299 
300 static u8 __bnep_rx_hlen[] = {
301 	ETH_HLEN,     /* BNEP_GENERAL */
302 	0,            /* BNEP_CONTROL */
303 	2,            /* BNEP_COMPRESSED */
304 	ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
305 	ETH_ALEN + 2  /* BNEP_COMPRESSED_DST_ONLY */
306 };
307 #define BNEP_RX_TYPES	(sizeof(__bnep_rx_hlen) - 1)
308 
309 static inline int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
310 {
311 	struct net_device *dev = s->dev;
312 	struct sk_buff *nskb;
313 	u8 type;
314 
315 	dev->last_rx = jiffies;
316 	s->stats.rx_bytes += skb->len;
317 
318 	type = *(u8 *) skb->data; skb_pull(skb, 1);
319 
320 	if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES)
321 		goto badframe;
322 
323 	if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
324 		bnep_rx_control(s, skb->data, skb->len);
325 		kfree_skb(skb);
326 		return 0;
327 	}
328 
329 	skb_reset_mac_header(skb);
330 
331 	/* Verify and pull out header */
332 	if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
333 		goto badframe;
334 
335 	s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
336 
337 	if (type & BNEP_EXT_HEADER) {
338 		if (bnep_rx_extension(s, skb) < 0)
339 			goto badframe;
340 	}
341 
342 	/* Strip 802.1p header */
343 	if (ntohs(s->eh.h_proto) == 0x8100) {
344 		if (!skb_pull(skb, 4))
345 			goto badframe;
346 		s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
347 	}
348 
349 	/* We have to alloc new skb and copy data here :(. Because original skb
350 	 * may not be modified and because of the alignment requirements. */
351 	nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
352 	if (!nskb) {
353 		s->stats.rx_dropped++;
354 		kfree_skb(skb);
355 		return -ENOMEM;
356 	}
357 	skb_reserve(nskb, 2);
358 
359 	/* Decompress header and construct ether frame */
360 	switch (type & BNEP_TYPE_MASK) {
361 	case BNEP_COMPRESSED:
362 		memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
363 		break;
364 
365 	case BNEP_COMPRESSED_SRC_ONLY:
366 		memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
367 		memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);
368 		put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
369 		break;
370 
371 	case BNEP_COMPRESSED_DST_ONLY:
372 		memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
373 		       ETH_ALEN);
374 		memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
375 		       ETH_ALEN + 2);
376 		break;
377 
378 	case BNEP_GENERAL:
379 		memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
380 		       ETH_ALEN * 2);
381 		put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
382 		break;
383 	}
384 
385 	skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
386 	kfree_skb(skb);
387 
388 	s->stats.rx_packets++;
389 	nskb->ip_summed = CHECKSUM_NONE;
390 	nskb->protocol  = eth_type_trans(nskb, dev);
391 	netif_rx_ni(nskb);
392 	return 0;
393 
394 badframe:
395 	s->stats.rx_errors++;
396 	kfree_skb(skb);
397 	return 0;
398 }
399 
400 static u8 __bnep_tx_types[] = {
401 	BNEP_GENERAL,
402 	BNEP_COMPRESSED_SRC_ONLY,
403 	BNEP_COMPRESSED_DST_ONLY,
404 	BNEP_COMPRESSED
405 };
406 
407 static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
408 {
409 	struct ethhdr *eh = (void *) skb->data;
410 	struct socket *sock = s->sock;
411 	struct kvec iv[3];
412 	int len = 0, il = 0;
413 	u8 type = 0;
414 
415 	BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
416 
417 	if (!skb->dev) {
418 		/* Control frame sent by us */
419 		goto send;
420 	}
421 
422 	iv[il++] = (struct kvec) { &type, 1 };
423 	len++;
424 
425 	if (!compare_ether_addr(eh->h_dest, s->eh.h_source))
426 		type |= 0x01;
427 
428 	if (!compare_ether_addr(eh->h_source, s->eh.h_dest))
429 		type |= 0x02;
430 
431 	if (type)
432 		skb_pull(skb, ETH_ALEN * 2);
433 
434 	type = __bnep_tx_types[type];
435 	switch (type) {
436 	case BNEP_COMPRESSED_SRC_ONLY:
437 		iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
438 		len += ETH_ALEN;
439 		break;
440 
441 	case BNEP_COMPRESSED_DST_ONLY:
442 		iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
443 		len += ETH_ALEN;
444 		break;
445 	}
446 
447 send:
448 	iv[il++] = (struct kvec) { skb->data, skb->len };
449 	len += skb->len;
450 
451 	/* FIXME: linearize skb */
452 	{
453 		len = kernel_sendmsg(sock, &s->msg, iv, il, len);
454 	}
455 	kfree_skb(skb);
456 
457 	if (len > 0) {
458 		s->stats.tx_bytes += len;
459 		s->stats.tx_packets++;
460 		return 0;
461 	}
462 
463 	return len;
464 }
465 
466 static int bnep_session(void *arg)
467 {
468 	struct bnep_session *s = arg;
469 	struct net_device *dev = s->dev;
470 	struct sock *sk = s->sock->sk;
471 	struct sk_buff *skb;
472 	wait_queue_t wait;
473 
474 	BT_DBG("");
475 
476 	daemonize("kbnepd %s", dev->name);
477 	set_user_nice(current, -15);
478 
479 	init_waitqueue_entry(&wait, current);
480 	add_wait_queue(sk->sk_sleep, &wait);
481 	while (!atomic_read(&s->killed)) {
482 		set_current_state(TASK_INTERRUPTIBLE);
483 
484 		// RX
485 		while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
486 			skb_orphan(skb);
487 			bnep_rx_frame(s, skb);
488 		}
489 
490 		if (sk->sk_state != BT_CONNECTED)
491 			break;
492 
493 		// TX
494 		while ((skb = skb_dequeue(&sk->sk_write_queue)))
495 			if (bnep_tx_frame(s, skb))
496 				break;
497 		netif_wake_queue(dev);
498 
499 		schedule();
500 	}
501 	set_current_state(TASK_RUNNING);
502 	remove_wait_queue(sk->sk_sleep, &wait);
503 
504 	/* Cleanup session */
505 	down_write(&bnep_session_sem);
506 
507 	/* Delete network device */
508 	unregister_netdev(dev);
509 
510 	/* Release the socket */
511 	fput(s->sock->file);
512 
513 	__bnep_unlink_session(s);
514 
515 	up_write(&bnep_session_sem);
516 	free_netdev(dev);
517 	return 0;
518 }
519 
520 static struct device *bnep_get_device(struct bnep_session *session)
521 {
522 	bdaddr_t *src = &bt_sk(session->sock->sk)->src;
523 	bdaddr_t *dst = &bt_sk(session->sock->sk)->dst;
524 	struct hci_dev *hdev;
525 	struct hci_conn *conn;
526 
527 	hdev = hci_get_route(dst, src);
528 	if (!hdev)
529 		return NULL;
530 
531 	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
532 
533 	hci_dev_put(hdev);
534 
535 	return conn ? &conn->dev : NULL;
536 }
537 
538 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
539 {
540 	struct net_device *dev;
541 	struct bnep_session *s, *ss;
542 	u8 dst[ETH_ALEN], src[ETH_ALEN];
543 	int err;
544 
545 	BT_DBG("");
546 
547 	baswap((void *) dst, &bt_sk(sock->sk)->dst);
548 	baswap((void *) src, &bt_sk(sock->sk)->src);
549 
550 	/* session struct allocated as private part of net_device */
551 	dev = alloc_netdev(sizeof(struct bnep_session),
552 			   (*req->device) ? req->device : "bnep%d",
553 			   bnep_net_setup);
554 	if (!dev)
555 		return -ENOMEM;
556 
557 	down_write(&bnep_session_sem);
558 
559 	ss = __bnep_get_session(dst);
560 	if (ss && ss->state == BT_CONNECTED) {
561 		err = -EEXIST;
562 		goto failed;
563 	}
564 
565 	s = dev->priv;
566 
567 	/* This is rx header therefore addresses are swapped.
568 	 * ie eh.h_dest is our local address. */
569 	memcpy(s->eh.h_dest,   &src, ETH_ALEN);
570 	memcpy(s->eh.h_source, &dst, ETH_ALEN);
571 	memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
572 
573 	s->dev   = dev;
574 	s->sock  = sock;
575 	s->role  = req->role;
576 	s->state = BT_CONNECTED;
577 
578 	s->msg.msg_flags = MSG_NOSIGNAL;
579 
580 #ifdef CONFIG_BT_BNEP_MC_FILTER
581 	/* Set default mc filter */
582 	set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
583 #endif
584 
585 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
586 	/* Set default protocol filter */
587 	bnep_set_default_proto_filter(s);
588 #endif
589 
590 	SET_NETDEV_DEV(dev, bnep_get_device(s));
591 
592 	err = register_netdev(dev);
593 	if (err) {
594 		goto failed;
595 	}
596 
597 	__bnep_link_session(s);
598 
599 	err = kernel_thread(bnep_session, s, CLONE_KERNEL);
600 	if (err < 0) {
601 		/* Session thread start failed, gotta cleanup. */
602 		unregister_netdev(dev);
603 		__bnep_unlink_session(s);
604 		goto failed;
605 	}
606 
607 	up_write(&bnep_session_sem);
608 	strcpy(req->device, dev->name);
609 	return 0;
610 
611 failed:
612 	up_write(&bnep_session_sem);
613 	free_netdev(dev);
614 	return err;
615 }
616 
617 int bnep_del_connection(struct bnep_conndel_req *req)
618 {
619 	struct bnep_session *s;
620 	int  err = 0;
621 
622 	BT_DBG("");
623 
624 	down_read(&bnep_session_sem);
625 
626 	s = __bnep_get_session(req->dst);
627 	if (s) {
628 		/* Wakeup user-space which is polling for socket errors.
629 		 * This is temporary hack untill we have shutdown in L2CAP */
630 		s->sock->sk->sk_err = EUNATCH;
631 
632 		/* Kill session thread */
633 		atomic_inc(&s->killed);
634 		wake_up_interruptible(s->sock->sk->sk_sleep);
635 	} else
636 		err = -ENOENT;
637 
638 	up_read(&bnep_session_sem);
639 	return err;
640 }
641 
642 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
643 {
644 	memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
645 	strcpy(ci->device, s->dev->name);
646 	ci->flags = s->flags;
647 	ci->state = s->state;
648 	ci->role  = s->role;
649 }
650 
651 int bnep_get_connlist(struct bnep_connlist_req *req)
652 {
653 	struct list_head *p;
654 	int err = 0, n = 0;
655 
656 	down_read(&bnep_session_sem);
657 
658 	list_for_each(p, &bnep_session_list) {
659 		struct bnep_session *s;
660 		struct bnep_conninfo ci;
661 
662 		s = list_entry(p, struct bnep_session, list);
663 
664 		__bnep_copy_ci(&ci, s);
665 
666 		if (copy_to_user(req->ci, &ci, sizeof(ci))) {
667 			err = -EFAULT;
668 			break;
669 		}
670 
671 		if (++n >= req->cnum)
672 			break;
673 
674 		req->ci++;
675 	}
676 	req->cnum = n;
677 
678 	up_read(&bnep_session_sem);
679 	return err;
680 }
681 
682 int bnep_get_conninfo(struct bnep_conninfo *ci)
683 {
684 	struct bnep_session *s;
685 	int err = 0;
686 
687 	down_read(&bnep_session_sem);
688 
689 	s = __bnep_get_session(ci->dst);
690 	if (s)
691 		__bnep_copy_ci(ci, s);
692 	else
693 		err = -ENOENT;
694 
695 	up_read(&bnep_session_sem);
696 	return err;
697 }
698 
699 static int __init bnep_init(void)
700 {
701 	char flt[50] = "";
702 
703 	l2cap_load();
704 
705 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
706 	strcat(flt, "protocol ");
707 #endif
708 
709 #ifdef CONFIG_BT_BNEP_MC_FILTER
710 	strcat(flt, "multicast");
711 #endif
712 
713 	BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
714 	if (flt[0])
715 		BT_INFO("BNEP filters: %s", flt);
716 
717 	bnep_sock_init();
718 	return 0;
719 }
720 
721 static void __exit bnep_exit(void)
722 {
723 	bnep_sock_cleanup();
724 }
725 
726 module_init(bnep_init);
727 module_exit(bnep_exit);
728 
729 MODULE_AUTHOR("David Libault <david.libault@inventel.fr>, Maxim Krasnyansky <maxk@qualcomm.com>");
730 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
731 MODULE_VERSION(VERSION);
732 MODULE_LICENSE("GPL");
733 MODULE_ALIAS("bt-proto-4");
734