xref: /linux/net/bluetooth/bnep/core.c (revision ca55b2fef3a9373fcfc30f82fd26bc7fccbda732) 
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 #include <linux/kthread.h>
30 #include <linux/file.h>
31 #include <linux/etherdevice.h>
32 #include <asm/unaligned.h>
33 
34 #include <net/bluetooth/bluetooth.h>
35 #include <net/bluetooth/l2cap.h>
36 #include <net/bluetooth/hci_core.h>
37 
38 #include "bnep.h"
39 
40 #define VERSION "1.3"
41 
42 static bool compress_src = true;
43 static bool compress_dst = true;
44 
45 static LIST_HEAD(bnep_session_list);
46 static DECLARE_RWSEM(bnep_session_sem);
47 
48 static struct bnep_session *__bnep_get_session(u8 *dst)
49 {
50 	struct bnep_session *s;
51 
52 	BT_DBG("");
53 
54 	list_for_each_entry(s, &bnep_session_list, list)
55 		if (ether_addr_equal(dst, s->eh.h_source))
56 			return s;
57 
58 	return NULL;
59 }
60 
61 static void __bnep_link_session(struct bnep_session *s)
62 {
63 	list_add(&s->list, &bnep_session_list);
64 }
65 
66 static void __bnep_unlink_session(struct bnep_session *s)
67 {
68 	list_del(&s->list);
69 }
70 
71 static int bnep_send(struct bnep_session *s, void *data, size_t len)
72 {
73 	struct socket *sock = s->sock;
74 	struct kvec iv = { data, len };
75 
76 	return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
77 }
78 
79 static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
80 {
81 	struct bnep_control_rsp rsp;
82 	rsp.type = BNEP_CONTROL;
83 	rsp.ctrl = ctrl;
84 	rsp.resp = htons(resp);
85 	return bnep_send(s, &rsp, sizeof(rsp));
86 }
87 
88 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
89 static inline void bnep_set_default_proto_filter(struct bnep_session *s)
90 {
91 	/* (IPv4, ARP)  */
92 	s->proto_filter[0].start = ETH_P_IP;
93 	s->proto_filter[0].end   = ETH_P_ARP;
94 	/* (RARP, AppleTalk) */
95 	s->proto_filter[1].start = ETH_P_RARP;
96 	s->proto_filter[1].end   = ETH_P_AARP;
97 	/* (IPX, IPv6) */
98 	s->proto_filter[2].start = ETH_P_IPX;
99 	s->proto_filter[2].end   = ETH_P_IPV6;
100 }
101 #endif
102 
103 static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
104 {
105 	int n;
106 
107 	if (len < 2)
108 		return -EILSEQ;
109 
110 	n = get_unaligned_be16(data);
111 	data++;
112 	len -= 2;
113 
114 	if (len < n)
115 		return -EILSEQ;
116 
117 	BT_DBG("filter len %d", n);
118 
119 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
120 	n /= 4;
121 	if (n <= BNEP_MAX_PROTO_FILTERS) {
122 		struct bnep_proto_filter *f = s->proto_filter;
123 		int i;
124 
125 		for (i = 0; i < n; i++) {
126 			f[i].start = get_unaligned_be16(data++);
127 			f[i].end   = get_unaligned_be16(data++);
128 
129 			BT_DBG("proto filter start %d end %d",
130 				f[i].start, f[i].end);
131 		}
132 
133 		if (i < BNEP_MAX_PROTO_FILTERS)
134 			memset(f + i, 0, sizeof(*f));
135 
136 		if (n == 0)
137 			bnep_set_default_proto_filter(s);
138 
139 		bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
140 	} else {
141 		bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
142 	}
143 #else
144 	bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
145 #endif
146 	return 0;
147 }
148 
149 static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
150 {
151 	int n;
152 
153 	if (len < 2)
154 		return -EILSEQ;
155 
156 	n = get_unaligned_be16(data);
157 	data += 2;
158 	len -= 2;
159 
160 	if (len < n)
161 		return -EILSEQ;
162 
163 	BT_DBG("filter len %d", n);
164 
165 #ifdef CONFIG_BT_BNEP_MC_FILTER
166 	n /= (ETH_ALEN * 2);
167 
168 	if (n > 0) {
169 		int i;
170 
171 		s->mc_filter = 0;
172 
173 		/* Always send broadcast */
174 		set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
175 
176 		/* Add address ranges to the multicast hash */
177 		for (; n > 0; n--) {
178 			u8 a1[6], *a2;
179 
180 			memcpy(a1, data, ETH_ALEN);
181 			data += ETH_ALEN;
182 			a2 = data;
183 			data += ETH_ALEN;
184 
185 			BT_DBG("mc filter %pMR -> %pMR", a1, a2);
186 
187 			/* Iterate from a1 to a2 */
188 			set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
189 			while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {
190 				/* Increment a1 */
191 				i = 5;
192 				while (i >= 0 && ++a1[i--] == 0)
193 					;
194 
195 				set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
196 			}
197 		}
198 	}
199 
200 	BT_DBG("mc filter hash 0x%llx", s->mc_filter);
201 
202 	bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
203 #else
204 	bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
205 #endif
206 	return 0;
207 }
208 
209 static int bnep_rx_control(struct bnep_session *s, void *data, int len)
210 {
211 	u8  cmd = *(u8 *)data;
212 	int err = 0;
213 
214 	data++;
215 	len--;
216 
217 	switch (cmd) {
218 	case BNEP_CMD_NOT_UNDERSTOOD:
219 	case BNEP_SETUP_CONN_RSP:
220 	case BNEP_FILTER_NET_TYPE_RSP:
221 	case BNEP_FILTER_MULTI_ADDR_RSP:
222 		/* Ignore these for now */
223 		break;
224 
225 	case BNEP_FILTER_NET_TYPE_SET:
226 		err = bnep_ctrl_set_netfilter(s, data, len);
227 		break;
228 
229 	case BNEP_FILTER_MULTI_ADDR_SET:
230 		err = bnep_ctrl_set_mcfilter(s, data, len);
231 		break;
232 
233 	case BNEP_SETUP_CONN_REQ:
234 		/* Successful response should be sent only once */
235 		if (test_bit(BNEP_SETUP_RESPONSE, &s->flags) &&
236 		    !test_and_set_bit(BNEP_SETUP_RSP_SENT, &s->flags))
237 			err = bnep_send_rsp(s, BNEP_SETUP_CONN_RSP,
238 					    BNEP_SUCCESS);
239 		else
240 			err = bnep_send_rsp(s, BNEP_SETUP_CONN_RSP,
241 					    BNEP_CONN_NOT_ALLOWED);
242 		break;
243 
244 	default: {
245 			u8 pkt[3];
246 			pkt[0] = BNEP_CONTROL;
247 			pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
248 			pkt[2] = cmd;
249 			err = bnep_send(s, pkt, sizeof(pkt));
250 		}
251 		break;
252 	}
253 
254 	return err;
255 }
256 
257 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
258 {
259 	struct bnep_ext_hdr *h;
260 	int err = 0;
261 
262 	do {
263 		h = (void *) skb->data;
264 		if (!skb_pull(skb, sizeof(*h))) {
265 			err = -EILSEQ;
266 			break;
267 		}
268 
269 		BT_DBG("type 0x%x len %d", h->type, h->len);
270 
271 		switch (h->type & BNEP_TYPE_MASK) {
272 		case BNEP_EXT_CONTROL:
273 			bnep_rx_control(s, skb->data, skb->len);
274 			break;
275 
276 		default:
277 			/* Unknown extension, skip it. */
278 			break;
279 		}
280 
281 		if (!skb_pull(skb, h->len)) {
282 			err = -EILSEQ;
283 			break;
284 		}
285 	} while (!err && (h->type & BNEP_EXT_HEADER));
286 
287 	return err;
288 }
289 
290 static u8 __bnep_rx_hlen[] = {
291 	ETH_HLEN,     /* BNEP_GENERAL */
292 	0,            /* BNEP_CONTROL */
293 	2,            /* BNEP_COMPRESSED */
294 	ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
295 	ETH_ALEN + 2  /* BNEP_COMPRESSED_DST_ONLY */
296 };
297 
298 static int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
299 {
300 	struct net_device *dev = s->dev;
301 	struct sk_buff *nskb;
302 	u8 type, ctrl_type;
303 
304 	dev->stats.rx_bytes += skb->len;
305 
306 	type = *(u8 *) skb->data;
307 	skb_pull(skb, 1);
308 	ctrl_type = *(u8 *)skb->data;
309 
310 	if ((type & BNEP_TYPE_MASK) >= sizeof(__bnep_rx_hlen))
311 		goto badframe;
312 
313 	if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
314 		if (bnep_rx_control(s, skb->data, skb->len) < 0) {
315 			dev->stats.tx_errors++;
316 			kfree_skb(skb);
317 			return 0;
318 		}
319 
320 		if (!(type & BNEP_EXT_HEADER)) {
321 			kfree_skb(skb);
322 			return 0;
323 		}
324 
325 		/* Verify and pull ctrl message since it's already processed */
326 		switch (ctrl_type) {
327 		case BNEP_SETUP_CONN_REQ:
328 			/* Pull: ctrl type (1 b), len (1 b), data (len bytes) */
329 			if (!skb_pull(skb, 2 + *(u8 *)(skb->data + 1) * 2))
330 				goto badframe;
331 			break;
332 		case BNEP_FILTER_MULTI_ADDR_SET:
333 		case BNEP_FILTER_NET_TYPE_SET:
334 			/* Pull: ctrl type (1 b), len (2 b), data (len bytes) */
335 			if (!skb_pull(skb, 3 + *(u16 *)(skb->data + 1) * 2))
336 				goto badframe;
337 			break;
338 		default:
339 			kfree_skb(skb);
340 			return 0;
341 		}
342 	} else {
343 		skb_reset_mac_header(skb);
344 
345 		/* Verify and pull out header */
346 		if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
347 			goto badframe;
348 
349 		s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
350 	}
351 
352 	if (type & BNEP_EXT_HEADER) {
353 		if (bnep_rx_extension(s, skb) < 0)
354 			goto badframe;
355 	}
356 
357 	/* Strip 802.1p header */
358 	if (ntohs(s->eh.h_proto) == ETH_P_8021Q) {
359 		if (!skb_pull(skb, 4))
360 			goto badframe;
361 		s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
362 	}
363 
364 	/* We have to alloc new skb and copy data here :(. Because original skb
365 	 * may not be modified and because of the alignment requirements. */
366 	nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
367 	if (!nskb) {
368 		dev->stats.rx_dropped++;
369 		kfree_skb(skb);
370 		return -ENOMEM;
371 	}
372 	skb_reserve(nskb, 2);
373 
374 	/* Decompress header and construct ether frame */
375 	switch (type & BNEP_TYPE_MASK) {
376 	case BNEP_COMPRESSED:
377 		memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
378 		break;
379 
380 	case BNEP_COMPRESSED_SRC_ONLY:
381 		memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
382 		memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);
383 		put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
384 		break;
385 
386 	case BNEP_COMPRESSED_DST_ONLY:
387 		memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
388 								ETH_ALEN);
389 		memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
390 								ETH_ALEN + 2);
391 		break;
392 
393 	case BNEP_GENERAL:
394 		memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
395 								ETH_ALEN * 2);
396 		put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
397 		break;
398 	}
399 
400 	skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
401 	kfree_skb(skb);
402 
403 	dev->stats.rx_packets++;
404 	nskb->ip_summed = CHECKSUM_NONE;
405 	nskb->protocol  = eth_type_trans(nskb, dev);
406 	netif_rx_ni(nskb);
407 	return 0;
408 
409 badframe:
410 	dev->stats.rx_errors++;
411 	kfree_skb(skb);
412 	return 0;
413 }
414 
415 static u8 __bnep_tx_types[] = {
416 	BNEP_GENERAL,
417 	BNEP_COMPRESSED_SRC_ONLY,
418 	BNEP_COMPRESSED_DST_ONLY,
419 	BNEP_COMPRESSED
420 };
421 
422 static int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
423 {
424 	struct ethhdr *eh = (void *) skb->data;
425 	struct socket *sock = s->sock;
426 	struct kvec iv[3];
427 	int len = 0, il = 0;
428 	u8 type = 0;
429 
430 	BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
431 
432 	if (!skb->dev) {
433 		/* Control frame sent by us */
434 		goto send;
435 	}
436 
437 	iv[il++] = (struct kvec) { &type, 1 };
438 	len++;
439 
440 	if (compress_src && ether_addr_equal(eh->h_dest, s->eh.h_source))
441 		type |= 0x01;
442 
443 	if (compress_dst && ether_addr_equal(eh->h_source, s->eh.h_dest))
444 		type |= 0x02;
445 
446 	if (type)
447 		skb_pull(skb, ETH_ALEN * 2);
448 
449 	type = __bnep_tx_types[type];
450 	switch (type) {
451 	case BNEP_COMPRESSED_SRC_ONLY:
452 		iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
453 		len += ETH_ALEN;
454 		break;
455 
456 	case BNEP_COMPRESSED_DST_ONLY:
457 		iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
458 		len += ETH_ALEN;
459 		break;
460 	}
461 
462 send:
463 	iv[il++] = (struct kvec) { skb->data, skb->len };
464 	len += skb->len;
465 
466 	/* FIXME: linearize skb */
467 	{
468 		len = kernel_sendmsg(sock, &s->msg, iv, il, len);
469 	}
470 	kfree_skb(skb);
471 
472 	if (len > 0) {
473 		s->dev->stats.tx_bytes += len;
474 		s->dev->stats.tx_packets++;
475 		return 0;
476 	}
477 
478 	return len;
479 }
480 
481 static int bnep_session(void *arg)
482 {
483 	struct bnep_session *s = arg;
484 	struct net_device *dev = s->dev;
485 	struct sock *sk = s->sock->sk;
486 	struct sk_buff *skb;
487 	wait_queue_t wait;
488 
489 	BT_DBG("");
490 
491 	set_user_nice(current, -15);
492 
493 	init_waitqueue_entry(&wait, current);
494 	add_wait_queue(sk_sleep(sk), &wait);
495 	while (1) {
496 		set_current_state(TASK_INTERRUPTIBLE);
497 
498 		if (atomic_read(&s->terminate))
499 			break;
500 		/* RX */
501 		while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
502 			skb_orphan(skb);
503 			if (!skb_linearize(skb))
504 				bnep_rx_frame(s, skb);
505 			else
506 				kfree_skb(skb);
507 		}
508 
509 		if (sk->sk_state != BT_CONNECTED)
510 			break;
511 
512 		/* TX */
513 		while ((skb = skb_dequeue(&sk->sk_write_queue)))
514 			if (bnep_tx_frame(s, skb))
515 				break;
516 		netif_wake_queue(dev);
517 
518 		schedule();
519 	}
520 	__set_current_state(TASK_RUNNING);
521 	remove_wait_queue(sk_sleep(sk), &wait);
522 
523 	/* Cleanup session */
524 	down_write(&bnep_session_sem);
525 
526 	/* Delete network device */
527 	unregister_netdev(dev);
528 
529 	/* Wakeup user-space polling for socket errors */
530 	s->sock->sk->sk_err = EUNATCH;
531 
532 	wake_up_interruptible(sk_sleep(s->sock->sk));
533 
534 	/* Release the socket */
535 	fput(s->sock->file);
536 
537 	__bnep_unlink_session(s);
538 
539 	up_write(&bnep_session_sem);
540 	free_netdev(dev);
541 	module_put_and_exit(0);
542 	return 0;
543 }
544 
545 static struct device *bnep_get_device(struct bnep_session *session)
546 {
547 	struct l2cap_conn *conn = l2cap_pi(session->sock->sk)->chan->conn;
548 
549 	if (!conn || !conn->hcon)
550 		return NULL;
551 
552 	return &conn->hcon->dev;
553 }
554 
555 static struct device_type bnep_type = {
556 	.name	= "bluetooth",
557 };
558 
559 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
560 {
561 	u32 valid_flags = BIT(BNEP_SETUP_RESPONSE);
562 	struct net_device *dev;
563 	struct bnep_session *s, *ss;
564 	u8 dst[ETH_ALEN], src[ETH_ALEN];
565 	int err;
566 
567 	BT_DBG("");
568 
569 	if (!l2cap_is_socket(sock))
570 		return -EBADFD;
571 
572 	if (req->flags & ~valid_flags)
573 		return -EINVAL;
574 
575 	baswap((void *) dst, &l2cap_pi(sock->sk)->chan->dst);
576 	baswap((void *) src, &l2cap_pi(sock->sk)->chan->src);
577 
578 	/* session struct allocated as private part of net_device */
579 	dev = alloc_netdev(sizeof(struct bnep_session),
580 			   (*req->device) ? req->device : "bnep%d",
581 			   NET_NAME_UNKNOWN,
582 			   bnep_net_setup);
583 	if (!dev)
584 		return -ENOMEM;
585 
586 	down_write(&bnep_session_sem);
587 
588 	ss = __bnep_get_session(dst);
589 	if (ss && ss->state == BT_CONNECTED) {
590 		err = -EEXIST;
591 		goto failed;
592 	}
593 
594 	s = netdev_priv(dev);
595 
596 	/* This is rx header therefore addresses are swapped.
597 	 * ie. eh.h_dest is our local address. */
598 	memcpy(s->eh.h_dest,   &src, ETH_ALEN);
599 	memcpy(s->eh.h_source, &dst, ETH_ALEN);
600 	memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
601 
602 	s->dev   = dev;
603 	s->sock  = sock;
604 	s->role  = req->role;
605 	s->state = BT_CONNECTED;
606 	s->flags = req->flags;
607 
608 	s->msg.msg_flags = MSG_NOSIGNAL;
609 
610 #ifdef CONFIG_BT_BNEP_MC_FILTER
611 	/* Set default mc filter */
612 	set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
613 #endif
614 
615 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
616 	/* Set default protocol filter */
617 	bnep_set_default_proto_filter(s);
618 #endif
619 
620 	SET_NETDEV_DEV(dev, bnep_get_device(s));
621 	SET_NETDEV_DEVTYPE(dev, &bnep_type);
622 
623 	err = register_netdev(dev);
624 	if (err)
625 		goto failed;
626 
627 	__bnep_link_session(s);
628 
629 	__module_get(THIS_MODULE);
630 	s->task = kthread_run(bnep_session, s, "kbnepd %s", dev->name);
631 	if (IS_ERR(s->task)) {
632 		/* Session thread start failed, gotta cleanup. */
633 		module_put(THIS_MODULE);
634 		unregister_netdev(dev);
635 		__bnep_unlink_session(s);
636 		err = PTR_ERR(s->task);
637 		goto failed;
638 	}
639 
640 	up_write(&bnep_session_sem);
641 	strcpy(req->device, dev->name);
642 	return 0;
643 
644 failed:
645 	up_write(&bnep_session_sem);
646 	free_netdev(dev);
647 	return err;
648 }
649 
650 int bnep_del_connection(struct bnep_conndel_req *req)
651 {
652 	u32 valid_flags = 0;
653 	struct bnep_session *s;
654 	int  err = 0;
655 
656 	BT_DBG("");
657 
658 	if (req->flags & ~valid_flags)
659 		return -EINVAL;
660 
661 	down_read(&bnep_session_sem);
662 
663 	s = __bnep_get_session(req->dst);
664 	if (s) {
665 		atomic_inc(&s->terminate);
666 		wake_up_process(s->task);
667 	} else
668 		err = -ENOENT;
669 
670 	up_read(&bnep_session_sem);
671 	return err;
672 }
673 
674 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
675 {
676 	u32 valid_flags = BIT(BNEP_SETUP_RESPONSE);
677 
678 	memset(ci, 0, sizeof(*ci));
679 	memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
680 	strcpy(ci->device, s->dev->name);
681 	ci->flags = s->flags & valid_flags;
682 	ci->state = s->state;
683 	ci->role  = s->role;
684 }
685 
686 int bnep_get_connlist(struct bnep_connlist_req *req)
687 {
688 	struct bnep_session *s;
689 	int err = 0, n = 0;
690 
691 	down_read(&bnep_session_sem);
692 
693 	list_for_each_entry(s, &bnep_session_list, list) {
694 		struct bnep_conninfo ci;
695 
696 		__bnep_copy_ci(&ci, s);
697 
698 		if (copy_to_user(req->ci, &ci, sizeof(ci))) {
699 			err = -EFAULT;
700 			break;
701 		}
702 
703 		if (++n >= req->cnum)
704 			break;
705 
706 		req->ci++;
707 	}
708 	req->cnum = n;
709 
710 	up_read(&bnep_session_sem);
711 	return err;
712 }
713 
714 int bnep_get_conninfo(struct bnep_conninfo *ci)
715 {
716 	struct bnep_session *s;
717 	int err = 0;
718 
719 	down_read(&bnep_session_sem);
720 
721 	s = __bnep_get_session(ci->dst);
722 	if (s)
723 		__bnep_copy_ci(ci, s);
724 	else
725 		err = -ENOENT;
726 
727 	up_read(&bnep_session_sem);
728 	return err;
729 }
730 
731 static int __init bnep_init(void)
732 {
733 	char flt[50] = "";
734 
735 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
736 	strcat(flt, "protocol ");
737 #endif
738 
739 #ifdef CONFIG_BT_BNEP_MC_FILTER
740 	strcat(flt, "multicast");
741 #endif
742 
743 	BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
744 	if (flt[0])
745 		BT_INFO("BNEP filters: %s", flt);
746 
747 	bnep_sock_init();
748 	return 0;
749 }
750 
751 static void __exit bnep_exit(void)
752 {
753 	bnep_sock_cleanup();
754 }
755 
756 module_init(bnep_init);
757 module_exit(bnep_exit);
758 
759 module_param(compress_src, bool, 0644);
760 MODULE_PARM_DESC(compress_src, "Compress sources headers");
761 
762 module_param(compress_dst, bool, 0644);
763 MODULE_PARM_DESC(compress_dst, "Compress destination headers");
764 
765 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
766 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
767 MODULE_VERSION(VERSION);
768 MODULE_LICENSE("GPL");
769 MODULE_ALIAS("bt-proto-4");
770