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[XFRM]: Purge dst references to deleted SAs passively.
[linux-2.6/sactl.git] / net / bluetooth / bnep / core.c
blobe620061fb50fd83cd530167d863b1745f3f7a3fd
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/errno.h>
40 #include <linux/smp_lock.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/l2cap.h>
55
56 #include "bnep.h"
57
58 #ifndef CONFIG_BT_BNEP_DEBUG
59 #undef BT_DBG
60 #define BT_DBG(D...)
61 #endif
62
63 #define VERSION "1.2"
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 = htons(0x0800);
120 s->proto_filter[0].end = htons(0x0806);
121 /* (RARP, AppleTalk) */
122 s->proto_filter[1].start = htons(0x8035);
123 s->proto_filter[1].end = htons(0x80F3);
124 /* (IPX, IPv6) */
125 s->proto_filter[2].start = htons(0x8137);
126 s->proto_filter[2].end = htons(0x86DD);
127 }
128 #endif
129
130 static int bnep_ctrl_set_netfilter(struct bnep_session *s, u16 *data, int len)
131 {
132 int n;
133
134 if (len < 2)
135 return -EILSEQ;
136
137 n = ntohs(get_unaligned(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(data++);
153 f[i].end = get_unaligned(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 = ntohs(get_unaligned((u16 *) 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->mac.raw = skb->data;
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((u16 *) (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((u16 *) (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.raw, ETH_ALEN);
367 put_unaligned(s->eh.h_proto, (u16 *) __skb_put(nskb, 2));
368 break;
369
370 case BNEP_COMPRESSED_DST_ONLY:
371 memcpy(__skb_put(nskb, ETH_ALEN), skb->mac.raw, ETH_ALEN);
372 memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source, ETH_ALEN + 2);
373 break;
374
375 case BNEP_GENERAL:
376 memcpy(__skb_put(nskb, ETH_ALEN * 2), skb->mac.raw, ETH_ALEN * 2);
377 put_unaligned(s->eh.h_proto, (u16 *) __skb_put(nskb, 2));
378 break;
379 }
380
381 memcpy(__skb_put(nskb, skb->len), skb->data, skb->len);
382 kfree_skb(skb);
383
384 s->stats.rx_packets++;
385 nskb->dev = dev;
386 nskb->ip_summed = CHECKSUM_NONE;
387 nskb->protocol = eth_type_trans(nskb, dev);
388 netif_rx_ni(nskb);
389 return 0;
390
391 badframe:
392 s->stats.rx_errors++;
393 kfree_skb(skb);
394 return 0;
395 }
396
397 static u8 __bnep_tx_types[] = {
398 BNEP_GENERAL,
399 BNEP_COMPRESSED_SRC_ONLY,
400 BNEP_COMPRESSED_DST_ONLY,
401 BNEP_COMPRESSED
402 };
403
404 static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
405 {
406 struct ethhdr *eh = (void *) skb->data;
407 struct socket *sock = s->sock;
408 struct kvec iv[3];
409 int len = 0, il = 0;
410 u8 type = 0;
411
412 BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
413
414 if (!skb->dev) {
415 /* Control frame sent by us */
416 goto send;
417 }
418
419 iv[il++] = (struct kvec) { &type, 1 };
420 len++;
421
422 if (!compare_ether_addr(eh->h_dest, s->eh.h_source))
423 type |= 0x01;
424
425 if (!compare_ether_addr(eh->h_source, s->eh.h_dest))
426 type |= 0x02;
427
428 if (type)
429 skb_pull(skb, ETH_ALEN * 2);
430
431 type = __bnep_tx_types[type];
432 switch (type) {
433 case BNEP_COMPRESSED_SRC_ONLY:
434 iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
435 len += ETH_ALEN;
436 break;
437
438 case BNEP_COMPRESSED_DST_ONLY:
439 iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
440 len += ETH_ALEN;
441 break;
442 }
443
444 send:
445 iv[il++] = (struct kvec) { skb->data, skb->len };
446 len += skb->len;
447
448 /* FIXME: linearize skb */
449 {
450 len = kernel_sendmsg(sock, &s->msg, iv, il, len);
451 }
452 kfree_skb(skb);
453
454 if (len > 0) {
455 s->stats.tx_bytes += len;
456 s->stats.tx_packets++;
457 return 0;
458 }
459
460 return len;
461 }
462
463 static int bnep_session(void *arg)
464 {
465 struct bnep_session *s = arg;
466 struct net_device *dev = s->dev;
467 struct sock *sk = s->sock->sk;
468 struct sk_buff *skb;
469 wait_queue_t wait;
470
471 BT_DBG("");
472
473 daemonize("kbnepd %s", dev->name);
474 set_user_nice(current, -15);
475 current->flags |= PF_NOFREEZE;
476
477 init_waitqueue_entry(&wait, current);
478 add_wait_queue(sk->sk_sleep, &wait);
479 while (!atomic_read(&s->killed)) {
480 set_current_state(TASK_INTERRUPTIBLE);
481
482 // RX
483 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
484 skb_orphan(skb);
485 bnep_rx_frame(s, skb);
486 }
487
488 if (sk->sk_state != BT_CONNECTED)
489 break;
490
491 // TX
492 while ((skb = skb_dequeue(&sk->sk_write_queue)))
493 if (bnep_tx_frame(s, skb))
494 break;
495 netif_wake_queue(dev);
496
497 schedule();
498 }
499 set_current_state(TASK_RUNNING);
500 remove_wait_queue(sk->sk_sleep, &wait);
501
502 /* Cleanup session */
503 down_write(&bnep_session_sem);
504
505 /* Delete network device */
506 unregister_netdev(dev);
507
508 /* Release the socket */
509 fput(s->sock->file);
510
511 __bnep_unlink_session(s);
512
513 up_write(&bnep_session_sem);
514 free_netdev(dev);
515 return 0;
516 }
517
518 int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
519 {
520 struct net_device *dev;
521 struct bnep_session *s, *ss;
522 u8 dst[ETH_ALEN], src[ETH_ALEN];
523 int err;
524
525 BT_DBG("");
526
527 baswap((void *) dst, &bt_sk(sock->sk)->dst);
528 baswap((void *) src, &bt_sk(sock->sk)->src);
529
530 /* session struct allocated as private part of net_device */
531 dev = alloc_netdev(sizeof(struct bnep_session),
532 (*req->device) ? req->device : "bnep%d",
533 bnep_net_setup);
534 if (!dev)
535 return -ENOMEM;
536
537
538 down_write(&bnep_session_sem);
539
540 ss = __bnep_get_session(dst);
541 if (ss && ss->state == BT_CONNECTED) {
542 err = -EEXIST;
543 goto failed;
544 }
545
546 s = dev->priv;
547
548 /* This is rx header therefore addresses are swapped.
549 * ie eh.h_dest is our local address. */
550 memcpy(s->eh.h_dest, &src, ETH_ALEN);
551 memcpy(s->eh.h_source, &dst, ETH_ALEN);
552 memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
553
554 s->dev = dev;
555 s->sock = sock;
556 s->role = req->role;
557 s->state = BT_CONNECTED;
558
559 s->msg.msg_flags = MSG_NOSIGNAL;
560
561 #ifdef CONFIG_BT_BNEP_MC_FILTER
562 /* Set default mc filter */
563 set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
564 #endif
565
566 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
567 /* Set default protocol filter */
568 bnep_set_default_proto_filter(s);
569 #endif
570
571 err = register_netdev(dev);
572 if (err) {
573 goto failed;
574 }
575
576 __bnep_link_session(s);
577
578 err = kernel_thread(bnep_session, s, CLONE_KERNEL);
579 if (err < 0) {
580 /* Session thread start failed, gotta cleanup. */
581 unregister_netdev(dev);
582 __bnep_unlink_session(s);
583 goto failed;
584 }
585
586 up_write(&bnep_session_sem);
587 strcpy(req->device, dev->name);
588 return 0;
589
590 failed:
591 up_write(&bnep_session_sem);
592 free_netdev(dev);
593 return err;
594 }
595
596 int bnep_del_connection(struct bnep_conndel_req *req)
597 {
598 struct bnep_session *s;
599 int err = 0;
600
601 BT_DBG("");
602
603 down_read(&bnep_session_sem);
604
605 s = __bnep_get_session(req->dst);
606 if (s) {
607 /* Wakeup user-space which is polling for socket errors.
608 * This is temporary hack untill we have shutdown in L2CAP */
609 s->sock->sk->sk_err = EUNATCH;
610
611 /* Kill session thread */
612 atomic_inc(&s->killed);
613 wake_up_interruptible(s->sock->sk->sk_sleep);
614 } else
615 err = -ENOENT;
616
617 up_read(&bnep_session_sem);
618 return err;
619 }
620
621 static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
622 {
623 memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
624 strcpy(ci->device, s->dev->name);
625 ci->flags = s->flags;
626 ci->state = s->state;
627 ci->role = s->role;
628 }
629
630 int bnep_get_connlist(struct bnep_connlist_req *req)
631 {
632 struct list_head *p;
633 int err = 0, n = 0;
634
635 down_read(&bnep_session_sem);
636
637 list_for_each(p, &bnep_session_list) {
638 struct bnep_session *s;
639 struct bnep_conninfo ci;
640
641 s = list_entry(p, struct bnep_session, list);
642
643 __bnep_copy_ci(&ci, s);
644
645 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
646 err = -EFAULT;
647 break;
648 }
649
650 if (++n >= req->cnum)
651 break;
652
653 req->ci++;
654 }
655 req->cnum = n;
656
657 up_read(&bnep_session_sem);
658 return err;
659 }
660
661 int bnep_get_conninfo(struct bnep_conninfo *ci)
662 {
663 struct bnep_session *s;
664 int err = 0;
665
666 down_read(&bnep_session_sem);
667
668 s = __bnep_get_session(ci->dst);
669 if (s)
670 __bnep_copy_ci(ci, s);
671 else
672 err = -ENOENT;
673
674 up_read(&bnep_session_sem);
675 return err;
676 }
677
678 static int __init bnep_init(void)
679 {
680 char flt[50] = "";
681
682 l2cap_load();
683
684 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
685 strcat(flt, "protocol ");
686 #endif
687
688 #ifdef CONFIG_BT_BNEP_MC_FILTER
689 strcat(flt, "multicast");
690 #endif
691
692 BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
693 if (flt[0])
694 BT_INFO("BNEP filters: %s", flt);
695
696 bnep_sock_init();
697 return 0;
698 }
699
700 static void __exit bnep_exit(void)
701 {
702 bnep_sock_cleanup();
703 }
704
705 module_init(bnep_init);
706 module_exit(bnep_exit);
707
708 MODULE_AUTHOR("David Libault <david.libault@inventel.fr>, Maxim Krasnyansky <maxk@qualcomm.com>");
709 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
710 MODULE_VERSION(VERSION);
711 MODULE_LICENSE("GPL");
712 MODULE_ALIAS("bt-proto-4");
SocketAccessConTroL development