Initial commit
[wrt350n-kernel.git] / net / bluetooth / bnep / core.c
blob347e935faaf0a175cfb23929b92dd9bbaf5682d1
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>
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>
42 #include <net/sock.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>
57 #include "bnep.h"
59 #ifndef CONFIG_BT_BNEP_DEBUG
60 #undef BT_DBG
61 #define BT_DBG(D...)
62 #endif
64 #define VERSION "1.2"
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;
72 struct list_head *p;
74 BT_DBG("");
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;
81 return NULL;
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)
95 list_del(&s->list);
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;
111 rsp.ctrl = ctrl;
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)
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;
129 #endif
131 static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
133 int n;
135 if (len < 2)
136 return -EILSEQ;
138 n = ntohs(get_unaligned(data));
139 data++; len -= 2;
141 if (len < n)
142 return -EILSEQ;
144 BT_DBG("filter len %d", n);
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;
152 for (i = 0; i < n; i++) {
153 f[i].start = ntohs(get_unaligned(data++));
154 f[i].end = ntohs(get_unaligned(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));
163 if (n == 0)
164 bnep_set_default_proto_filter(s);
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);
170 #else
171 bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
172 #endif
173 return 0;
176 static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
178 int n;
180 if (len < 2)
181 return -EILSEQ;
183 n = ntohs(get_unaligned((__be16 *) data));
184 data += 2; len -= 2;
186 if (len < n)
187 return -EILSEQ;
189 BT_DBG("filter len %d", n);
191 #ifdef CONFIG_BT_BNEP_MC_FILTER
192 n /= (ETH_ALEN * 2);
194 if (n > 0) {
195 s->mc_filter = 0;
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 */
201 for (; n > 0; n--) {
202 u8 a1[6], *a2;
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) {
215 INCA(a1);
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);
224 #else
225 bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
226 #endif
227 return 0;
230 static int bnep_rx_control(struct bnep_session *s, void *data, int len)
232 u8 cmd = *(u8 *)data;
233 int err = 0;
235 data++; len--;
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;
246 case BNEP_FILTER_NET_TYPE_SET:
247 err = bnep_ctrl_set_netfilter(s, data, len);
248 break;
250 case BNEP_FILTER_MULTI_ADDR_SET:
251 err = bnep_ctrl_set_mcfilter(s, data, len);
252 break;
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));
261 break;
264 return err;
267 static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
269 struct bnep_ext_hdr *h;
270 int err = 0;
272 do {
273 h = (void *) skb->data;
274 if (!skb_pull(skb, sizeof(*h))) {
275 err = -EILSEQ;
276 break;
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);
284 break;
286 default:
287 /* Unknown extension, skip it. */
288 break;
291 if (!skb_pull(skb, h->len)) {
292 err = -EILSEQ;
293 break;
295 } while (!err && (h->type & BNEP_EXT_HEADER));
297 return err;
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;
313 u8 type;
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)
321 goto badframe;
323 if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
324 bnep_rx_control(s, skb->data, skb->len);
325 kfree_skb(skb);
326 return 0;
329 skb_reset_mac_header(skb);
331 /* Verify and pull out header */
332 if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
333 goto badframe;
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)
339 goto badframe;
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));
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;
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);
363 break;
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;
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;
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;
385 skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
386 kfree_skb(skb);
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;
394 badframe:
395 s->stats.rx_errors++;
396 kfree_skb(skb);
397 return 0;
400 static u8 __bnep_tx_types[] = {
401 BNEP_GENERAL,
402 BNEP_COMPRESSED_SRC_ONLY,
403 BNEP_COMPRESSED_DST_ONLY,
404 BNEP_COMPRESSED
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;
411 struct kvec iv[3];
412 int len = 0, il = 0;
413 u8 type = 0;
415 BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
417 if (!skb->dev) {
418 /* Control frame sent by us */
419 goto send;
422 iv[il++] = (struct kvec) { &type, 1 };
423 len++;
425 if (!compare_ether_addr(eh->h_dest, s->eh.h_source))
426 type |= 0x01;
428 if (!compare_ether_addr(eh->h_source, s->eh.h_dest))
429 type |= 0x02;
431 if (type)
432 skb_pull(skb, ETH_ALEN * 2);
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;
441 case BNEP_COMPRESSED_DST_ONLY:
442 iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
443 len += ETH_ALEN;
444 break;
447 send:
448 iv[il++] = (struct kvec) { skb->data, skb->len };
449 len += skb->len;
451 /* FIXME: linearize skb */
453 len = kernel_sendmsg(sock, &s->msg, iv, il, len);
455 kfree_skb(skb);
457 if (len > 0) {
458 s->stats.tx_bytes += len;
459 s->stats.tx_packets++;
460 return 0;
463 return len;
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;
471 struct sk_buff *skb;
472 wait_queue_t wait;
474 BT_DBG("");
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);
484 // RX
485 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
486 skb_orphan(skb);
487 bnep_rx_frame(s, skb);
490 if (sk->sk_state != BT_CONNECTED)
491 break;
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);
499 schedule();
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 /* Release the socket */
511 fput(s->sock->file);
513 __bnep_unlink_session(s);
515 up_write(&bnep_session_sem);
516 free_netdev(dev);
517 return 0;
520 static struct device *bnep_get_device(struct bnep_session *session)
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;
527 hdev = hci_get_route(dst, src);
528 if (!hdev)
529 return NULL;
531 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
533 hci_dev_put(hdev);
535 return conn ? &conn->dev : NULL;
538 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
540 struct net_device *dev;
541 struct bnep_session *s, *ss;
542 u8 dst[ETH_ALEN], src[ETH_ALEN];
543 int err;
545 BT_DBG("");
547 baswap((void *) dst, &bt_sk(sock->sk)->dst);
548 baswap((void *) src, &bt_sk(sock->sk)->src);
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;
557 down_write(&bnep_session_sem);
559 ss = __bnep_get_session(dst);
560 if (ss && ss->state == BT_CONNECTED) {
561 err = -EEXIST;
562 goto failed;
565 s = dev->priv;
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);
573 s->dev = dev;
574 s->sock = sock;
575 s->role = req->role;
576 s->state = BT_CONNECTED;
578 s->msg.msg_flags = MSG_NOSIGNAL;
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
585 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
586 /* Set default protocol filter */
587 bnep_set_default_proto_filter(s);
588 #endif
590 SET_NETDEV_DEV(dev, bnep_get_device(s));
592 err = register_netdev(dev);
593 if (err) {
594 goto failed;
597 __bnep_link_session(s);
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;
607 up_write(&bnep_session_sem);
608 strcpy(req->device, dev->name);
609 return 0;
611 failed:
612 up_write(&bnep_session_sem);
613 free_netdev(dev);
614 return err;
617 int bnep_del_connection(struct bnep_conndel_req *req)
619 struct bnep_session *s;
620 int err = 0;
622 BT_DBG("");
624 down_read(&bnep_session_sem);
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;
632 /* Kill session thread */
633 atomic_inc(&s->killed);
634 wake_up_interruptible(s->sock->sk->sk_sleep);
635 } else
636 err = -ENOENT;
638 up_read(&bnep_session_sem);
639 return err;
642 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
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;
651 int bnep_get_connlist(struct bnep_connlist_req *req)
653 struct list_head *p;
654 int err = 0, n = 0;
656 down_read(&bnep_session_sem);
658 list_for_each(p, &bnep_session_list) {
659 struct bnep_session *s;
660 struct bnep_conninfo ci;
662 s = list_entry(p, struct bnep_session, list);
664 __bnep_copy_ci(&ci, s);
666 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
667 err = -EFAULT;
668 break;
671 if (++n >= req->cnum)
672 break;
674 req->ci++;
676 req->cnum = n;
678 up_read(&bnep_session_sem);
679 return err;
682 int bnep_get_conninfo(struct bnep_conninfo *ci)
684 struct bnep_session *s;
685 int err = 0;
687 down_read(&bnep_session_sem);
689 s = __bnep_get_session(ci->dst);
690 if (s)
691 __bnep_copy_ci(ci, s);
692 else
693 err = -ENOENT;
695 up_read(&bnep_session_sem);
696 return err;
699 static int __init bnep_init(void)
701 char flt[50] = "";
703 l2cap_load();
705 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
706 strcat(flt, "protocol ");
707 #endif
709 #ifdef CONFIG_BT_BNEP_MC_FILTER
710 strcat(flt, "multicast");
711 #endif
713 BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
714 if (flt[0])
715 BT_INFO("BNEP filters: %s", flt);
717 bnep_sock_init();
718 return 0;
721 static void __exit bnep_exit(void)
723 bnep_sock_cleanup();
726 module_init(bnep_init);
727 module_exit(bnep_exit);
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");