2 BNEP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2001-2002 Inventel Systemes
5 Clément Moreau <clement.moreau@inventel.fr>
6 David Libault <david.libault@inventel.fr>
8 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
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;
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.
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.
29 * $Id: core.c,v 1.20 2002/08/04 21:23:58 maxk Exp $
32 #include <linux/module.h>
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>
44 #include <linux/socket.h>
45 #include <linux/file.h>
47 #include <linux/netdevice.h>
48 #include <linux/etherdevice.h>
49 #include <linux/skbuff.h>
51 #include <asm/unaligned.h>
53 #include <net/bluetooth/bluetooth.h>
54 #include <net/bluetooth/hci_core.h>
55 #include <net/bluetooth/l2cap.h>
59 #ifndef CONFIG_BT_BNEP_DEBUG
66 static LIST_HEAD(bnep_session_list);
67 static DECLARE_RWSEM(bnep_session_sem);
69 static struct bnep_session *__bnep_get_session(u8 *dst)
71 struct bnep_session *s;
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))
84 static void __bnep_link_session(struct bnep_session *s)
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.
89 __module_get(THIS_MODULE);
90 list_add(&s->list, &bnep_session_list);
93 static void __bnep_unlink_session(struct bnep_session *s)
96 module_put(THIS_MODULE);
99 static int bnep_send(struct bnep_session *s, void *data, size_t len)
101 struct socket *sock = s->sock;
102 struct kvec iv = { data, len };
104 return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
107 static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
109 struct bnep_control_rsp rsp;
110 rsp.type = BNEP_CONTROL;
112 rsp.resp = htons(resp);
113 return bnep_send(s, &rsp, sizeof(rsp));
116 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
117 static inline void bnep_set_default_proto_filter(struct bnep_session *s)
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;
126 s->proto_filter[2].start = ETH_P_IPX;
127 s->proto_filter[2].end = ETH_P_IPV6;
131 static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
138 n = get_unaligned_be16(data);
144 BT_DBG("filter len %d", n);
146 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
148 if (n <= BNEP_MAX_PROTO_FILTERS) {
149 struct bnep_proto_filter *f = s->proto_filter;
152 for (i = 0; i < n; i++) {
153 f[i].start = get_unaligned_be16(data++);
154 f[i].end = get_unaligned_be16(data++);
156 BT_DBG("proto filter start %d end %d",
157 f[i].start, f[i].end);
160 if (i < BNEP_MAX_PROTO_FILTERS)
161 memset(f + i, 0, sizeof(*f));
164 bnep_set_default_proto_filter(s);
166 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
168 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
171 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
176 static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
183 n = get_unaligned_be16(data);
189 BT_DBG("filter len %d", n);
191 #ifdef CONFIG_BT_BNEP_MC_FILTER
197 /* Always send broadcast */
198 set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
200 /* Add address ranges to the multicast hash */
204 memcpy(a1, data, ETH_ALEN); data += ETH_ALEN;
205 a2 = data; data += ETH_ALEN;
207 BT_DBG("mc filter %s -> %s",
208 batostr((void *) a1), batostr((void *) a2));
210 #define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }
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) {
216 set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
221 BT_DBG("mc filter hash 0x%llx", s->mc_filter);
223 bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
225 bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
230 static int bnep_rx_control(struct bnep_session *s, void *data, int len)
232 u8 cmd = *(u8 *)data;
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 */
246 case BNEP_FILTER_NET_TYPE_SET:
247 err = bnep_ctrl_set_netfilter(s, data, len);
250 case BNEP_FILTER_MULTI_ADDR_SET:
251 err = bnep_ctrl_set_mcfilter(s, data, len);
256 pkt[0] = BNEP_CONTROL;
257 pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
259 bnep_send(s, pkt, sizeof(pkt));
267 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
269 struct bnep_ext_hdr *h;
273 h = (void *) skb->data;
274 if (!skb_pull(skb, sizeof(*h))) {
279 BT_DBG("type 0x%x len %d", h->type, h->len);
281 switch (h->type & BNEP_TYPE_MASK) {
282 case BNEP_EXT_CONTROL:
283 bnep_rx_control(s, skb->data, skb->len);
287 /* Unknown extension, skip it. */
291 if (!skb_pull(skb, h->len)) {
295 } while (!err && (h->type & BNEP_EXT_HEADER));
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 */
307 #define BNEP_RX_TYPES (sizeof(__bnep_rx_hlen) - 1)
309 static inline int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
311 struct net_device *dev = s->dev;
312 struct sk_buff *nskb;
315 dev->last_rx = jiffies;
316 s->stats.rx_bytes += skb->len;
318 type = *(u8 *) skb->data; skb_pull(skb, 1);
320 if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES)
323 if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
324 bnep_rx_control(s, skb->data, skb->len);
329 skb_reset_mac_header(skb);
331 /* Verify and pull out header */
332 if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
335 s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
337 if (type & BNEP_EXT_HEADER) {
338 if (bnep_rx_extension(s, skb) < 0)
342 /* Strip 802.1p header */
343 if (ntohs(s->eh.h_proto) == 0x8100) {
344 if (!skb_pull(skb, 4))
346 s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
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);
353 s->stats.rx_dropped++;
357 skb_reserve(nskb, 2);
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);
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));
371 case BNEP_COMPRESSED_DST_ONLY:
372 memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
374 memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
379 memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
381 put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
385 skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
388 s->stats.rx_packets++;
389 nskb->ip_summed = CHECKSUM_NONE;
390 nskb->protocol = eth_type_trans(nskb, dev);
395 s->stats.rx_errors++;
400 static u8 __bnep_tx_types[] = {
402 BNEP_COMPRESSED_SRC_ONLY,
403 BNEP_COMPRESSED_DST_ONLY,
407 static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
409 struct ethhdr *eh = (void *) skb->data;
410 struct socket *sock = s->sock;
415 BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
418 /* Control frame sent by us */
422 iv[il++] = (struct kvec) { &type, 1 };
425 if (!compare_ether_addr(eh->h_dest, s->eh.h_source))
428 if (!compare_ether_addr(eh->h_source, s->eh.h_dest))
432 skb_pull(skb, ETH_ALEN * 2);
434 type = __bnep_tx_types[type];
436 case BNEP_COMPRESSED_SRC_ONLY:
437 iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
441 case BNEP_COMPRESSED_DST_ONLY:
442 iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
448 iv[il++] = (struct kvec) { skb->data, skb->len };
451 /* FIXME: linearize skb */
453 len = kernel_sendmsg(sock, &s->msg, iv, il, len);
458 s->stats.tx_bytes += len;
459 s->stats.tx_packets++;
466 static int bnep_session(void *arg)
468 struct bnep_session *s = arg;
469 struct net_device *dev = s->dev;
470 struct sock *sk = s->sock->sk;
476 daemonize("kbnepd %s", dev->name);
477 set_user_nice(current, -15);
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);
485 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
487 bnep_rx_frame(s, skb);
490 if (sk->sk_state != BT_CONNECTED)
494 while ((skb = skb_dequeue(&sk->sk_write_queue)))
495 if (bnep_tx_frame(s, skb))
497 netif_wake_queue(dev);
501 set_current_state(TASK_RUNNING);
502 remove_wait_queue(sk->sk_sleep, &wait);
504 /* Cleanup session */
505 down_write(&bnep_session_sem);
507 /* Delete network device */
508 unregister_netdev(dev);
510 /* Wakeup user-space polling for socket errors */
511 s->sock->sk->sk_err = EUNATCH;
513 wake_up_interruptible(s->sock->sk->sk_sleep);
515 /* Release the socket */
518 __bnep_unlink_session(s);
520 up_write(&bnep_session_sem);
525 static struct device *bnep_get_device(struct bnep_session *session)
527 bdaddr_t *src = &bt_sk(session->sock->sk)->src;
528 bdaddr_t *dst = &bt_sk(session->sock->sk)->dst;
529 struct hci_dev *hdev;
530 struct hci_conn *conn;
532 hdev = hci_get_route(dst, src);
536 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
540 return conn ? &conn->dev : NULL;
543 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
545 struct net_device *dev;
546 struct bnep_session *s, *ss;
547 u8 dst[ETH_ALEN], src[ETH_ALEN];
552 baswap((void *) dst, &bt_sk(sock->sk)->dst);
553 baswap((void *) src, &bt_sk(sock->sk)->src);
555 /* session struct allocated as private part of net_device */
556 dev = alloc_netdev(sizeof(struct bnep_session),
557 (*req->device) ? req->device : "bnep%d",
562 down_write(&bnep_session_sem);
564 ss = __bnep_get_session(dst);
565 if (ss && ss->state == BT_CONNECTED) {
572 /* This is rx header therefore addresses are swapped.
573 * ie eh.h_dest is our local address. */
574 memcpy(s->eh.h_dest, &src, ETH_ALEN);
575 memcpy(s->eh.h_source, &dst, ETH_ALEN);
576 memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
581 s->state = BT_CONNECTED;
583 s->msg.msg_flags = MSG_NOSIGNAL;
585 #ifdef CONFIG_BT_BNEP_MC_FILTER
586 /* Set default mc filter */
587 set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
590 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
591 /* Set default protocol filter */
592 bnep_set_default_proto_filter(s);
595 SET_NETDEV_DEV(dev, bnep_get_device(s));
597 err = register_netdev(dev);
602 __bnep_link_session(s);
604 err = kernel_thread(bnep_session, s, CLONE_KERNEL);
606 /* Session thread start failed, gotta cleanup. */
607 unregister_netdev(dev);
608 __bnep_unlink_session(s);
612 up_write(&bnep_session_sem);
613 strcpy(req->device, dev->name);
617 up_write(&bnep_session_sem);
622 int bnep_del_connection(struct bnep_conndel_req *req)
624 struct bnep_session *s;
629 down_read(&bnep_session_sem);
631 s = __bnep_get_session(req->dst);
633 /* Wakeup user-space which is polling for socket errors.
634 * This is temporary hack untill we have shutdown in L2CAP */
635 s->sock->sk->sk_err = EUNATCH;
637 /* Kill session thread */
638 atomic_inc(&s->killed);
639 wake_up_interruptible(s->sock->sk->sk_sleep);
643 up_read(&bnep_session_sem);
647 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
649 memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
650 strcpy(ci->device, s->dev->name);
651 ci->flags = s->flags;
652 ci->state = s->state;
656 int bnep_get_connlist(struct bnep_connlist_req *req)
661 down_read(&bnep_session_sem);
663 list_for_each(p, &bnep_session_list) {
664 struct bnep_session *s;
665 struct bnep_conninfo ci;
667 s = list_entry(p, struct bnep_session, list);
669 __bnep_copy_ci(&ci, s);
671 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
676 if (++n >= req->cnum)
683 up_read(&bnep_session_sem);
687 int bnep_get_conninfo(struct bnep_conninfo *ci)
689 struct bnep_session *s;
692 down_read(&bnep_session_sem);
694 s = __bnep_get_session(ci->dst);
696 __bnep_copy_ci(ci, s);
700 up_read(&bnep_session_sem);
704 static int __init bnep_init(void)
710 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
711 strcat(flt, "protocol ");
714 #ifdef CONFIG_BT_BNEP_MC_FILTER
715 strcat(flt, "multicast");
718 BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
720 BT_INFO("BNEP filters: %s", flt);
726 static void __exit bnep_exit(void)
731 module_init(bnep_init);
732 module_exit(bnep_exit);
734 MODULE_AUTHOR("David Libault <david.libault@inventel.fr>, Maxim Krasnyansky <maxk@qualcomm.com>");
735 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
736 MODULE_VERSION(VERSION);
737 MODULE_LICENSE("GPL");
738 MODULE_ALIAS("bt-proto-4");