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Merge tag 'urgent-slab-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/device...
[deliverable/linux.git] / net / bluetooth / hci_sock.c
1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23 */
24
25 /* Bluetooth HCI sockets. */
26
27 #include <linux/export.h>
28 #include <asm/unaligned.h>
29
30 #include <net/bluetooth/bluetooth.h>
31 #include <net/bluetooth/hci_core.h>
32 #include <net/bluetooth/hci_mon.h>
33
34 static atomic_t monitor_promisc = ATOMIC_INIT(0);
35
36 /* ----- HCI socket interface ----- */
37
38 static inline int hci_test_bit(int nr, void *addr)
39 {
40 return *((__u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
41 }
42
43 /* Security filter */
44 static struct hci_sec_filter hci_sec_filter = {
45 /* Packet types */
46 0x10,
47 /* Events */
48 { 0x1000d9fe, 0x0000b00c },
49 /* Commands */
50 {
51 { 0x0 },
52 /* OGF_LINK_CTL */
53 { 0xbe000006, 0x00000001, 0x00000000, 0x00 },
54 /* OGF_LINK_POLICY */
55 { 0x00005200, 0x00000000, 0x00000000, 0x00 },
56 /* OGF_HOST_CTL */
57 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
58 /* OGF_INFO_PARAM */
59 { 0x000002be, 0x00000000, 0x00000000, 0x00 },
60 /* OGF_STATUS_PARAM */
61 { 0x000000ea, 0x00000000, 0x00000000, 0x00 }
62 }
63 };
64
65 static struct bt_sock_list hci_sk_list = {
66 .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
67 };
68
69 static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb)
70 {
71 struct hci_filter *flt;
72 int flt_type, flt_event;
73
74 /* Apply filter */
75 flt = &hci_pi(sk)->filter;
76
77 if (bt_cb(skb)->pkt_type == HCI_VENDOR_PKT)
78 flt_type = 0;
79 else
80 flt_type = bt_cb(skb)->pkt_type & HCI_FLT_TYPE_BITS;
81
82 if (!test_bit(flt_type, &flt->type_mask))
83 return true;
84
85 /* Extra filter for event packets only */
86 if (bt_cb(skb)->pkt_type != HCI_EVENT_PKT)
87 return false;
88
89 flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
90
91 if (!hci_test_bit(flt_event, &flt->event_mask))
92 return true;
93
94 /* Check filter only when opcode is set */
95 if (!flt->opcode)
96 return false;
97
98 if (flt_event == HCI_EV_CMD_COMPLETE &&
99 flt->opcode != get_unaligned((__le16 *)(skb->data + 3)))
100 return true;
101
102 if (flt_event == HCI_EV_CMD_STATUS &&
103 flt->opcode != get_unaligned((__le16 *)(skb->data + 4)))
104 return true;
105
106 return false;
107 }
108
109 /* Send frame to RAW socket */
110 void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
111 {
112 struct sock *sk;
113 struct sk_buff *skb_copy = NULL;
114
115 BT_DBG("hdev %p len %d", hdev, skb->len);
116
117 read_lock(&hci_sk_list.lock);
118
119 sk_for_each(sk, &hci_sk_list.head) {
120 struct sk_buff *nskb;
121
122 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
123 continue;
124
125 /* Don't send frame to the socket it came from */
126 if (skb->sk == sk)
127 continue;
128
129 if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
130 if (is_filtered_packet(sk, skb))
131 continue;
132 } else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
133 if (!bt_cb(skb)->incoming)
134 continue;
135 if (bt_cb(skb)->pkt_type != HCI_EVENT_PKT &&
136 bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
137 bt_cb(skb)->pkt_type != HCI_SCODATA_PKT)
138 continue;
139 } else {
140 /* Don't send frame to other channel types */
141 continue;
142 }
143
144 if (!skb_copy) {
145 /* Create a private copy with headroom */
146 skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
147 if (!skb_copy)
148 continue;
149
150 /* Put type byte before the data */
151 memcpy(skb_push(skb_copy, 1), &bt_cb(skb)->pkt_type, 1);
152 }
153
154 nskb = skb_clone(skb_copy, GFP_ATOMIC);
155 if (!nskb)
156 continue;
157
158 if (sock_queue_rcv_skb(sk, nskb))
159 kfree_skb(nskb);
160 }
161
162 read_unlock(&hci_sk_list.lock);
163
164 kfree_skb(skb_copy);
165 }
166
167 /* Send frame to control socket */
168 void hci_send_to_control(struct sk_buff *skb, struct sock *skip_sk)
169 {
170 struct sock *sk;
171
172 BT_DBG("len %d", skb->len);
173
174 read_lock(&hci_sk_list.lock);
175
176 sk_for_each(sk, &hci_sk_list.head) {
177 struct sk_buff *nskb;
178
179 /* Skip the original socket */
180 if (sk == skip_sk)
181 continue;
182
183 if (sk->sk_state != BT_BOUND)
184 continue;
185
186 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
187 continue;
188
189 nskb = skb_clone(skb, GFP_ATOMIC);
190 if (!nskb)
191 continue;
192
193 if (sock_queue_rcv_skb(sk, nskb))
194 kfree_skb(nskb);
195 }
196
197 read_unlock(&hci_sk_list.lock);
198 }
199
200 /* Send frame to monitor socket */
201 void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
202 {
203 struct sock *sk;
204 struct sk_buff *skb_copy = NULL;
205 __le16 opcode;
206
207 if (!atomic_read(&monitor_promisc))
208 return;
209
210 BT_DBG("hdev %p len %d", hdev, skb->len);
211
212 switch (bt_cb(skb)->pkt_type) {
213 case HCI_COMMAND_PKT:
214 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
215 break;
216 case HCI_EVENT_PKT:
217 opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
218 break;
219 case HCI_ACLDATA_PKT:
220 if (bt_cb(skb)->incoming)
221 opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
222 else
223 opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
224 break;
225 case HCI_SCODATA_PKT:
226 if (bt_cb(skb)->incoming)
227 opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
228 else
229 opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
230 break;
231 default:
232 return;
233 }
234
235 read_lock(&hci_sk_list.lock);
236
237 sk_for_each(sk, &hci_sk_list.head) {
238 struct sk_buff *nskb;
239
240 if (sk->sk_state != BT_BOUND)
241 continue;
242
243 if (hci_pi(sk)->channel != HCI_CHANNEL_MONITOR)
244 continue;
245
246 if (!skb_copy) {
247 struct hci_mon_hdr *hdr;
248
249 /* Create a private copy with headroom */
250 skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE,
251 GFP_ATOMIC, true);
252 if (!skb_copy)
253 continue;
254
255 /* Put header before the data */
256 hdr = (void *) skb_push(skb_copy, HCI_MON_HDR_SIZE);
257 hdr->opcode = opcode;
258 hdr->index = cpu_to_le16(hdev->id);
259 hdr->len = cpu_to_le16(skb->len);
260 }
261
262 nskb = skb_clone(skb_copy, GFP_ATOMIC);
263 if (!nskb)
264 continue;
265
266 if (sock_queue_rcv_skb(sk, nskb))
267 kfree_skb(nskb);
268 }
269
270 read_unlock(&hci_sk_list.lock);
271
272 kfree_skb(skb_copy);
273 }
274
275 static void send_monitor_event(struct sk_buff *skb)
276 {
277 struct sock *sk;
278
279 BT_DBG("len %d", skb->len);
280
281 read_lock(&hci_sk_list.lock);
282
283 sk_for_each(sk, &hci_sk_list.head) {
284 struct sk_buff *nskb;
285
286 if (sk->sk_state != BT_BOUND)
287 continue;
288
289 if (hci_pi(sk)->channel != HCI_CHANNEL_MONITOR)
290 continue;
291
292 nskb = skb_clone(skb, GFP_ATOMIC);
293 if (!nskb)
294 continue;
295
296 if (sock_queue_rcv_skb(sk, nskb))
297 kfree_skb(nskb);
298 }
299
300 read_unlock(&hci_sk_list.lock);
301 }
302
303 static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
304 {
305 struct hci_mon_hdr *hdr;
306 struct hci_mon_new_index *ni;
307 struct sk_buff *skb;
308 __le16 opcode;
309
310 switch (event) {
311 case HCI_DEV_REG:
312 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
313 if (!skb)
314 return NULL;
315
316 ni = (void *) skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
317 ni->type = hdev->dev_type;
318 ni->bus = hdev->bus;
319 bacpy(&ni->bdaddr, &hdev->bdaddr);
320 memcpy(ni->name, hdev->name, 8);
321
322 opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
323 break;
324
325 case HCI_DEV_UNREG:
326 skb = bt_skb_alloc(0, GFP_ATOMIC);
327 if (!skb)
328 return NULL;
329
330 opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
331 break;
332
333 default:
334 return NULL;
335 }
336
337 __net_timestamp(skb);
338
339 hdr = (void *) skb_push(skb, HCI_MON_HDR_SIZE);
340 hdr->opcode = opcode;
341 hdr->index = cpu_to_le16(hdev->id);
342 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
343
344 return skb;
345 }
346
347 static void send_monitor_replay(struct sock *sk)
348 {
349 struct hci_dev *hdev;
350
351 read_lock(&hci_dev_list_lock);
352
353 list_for_each_entry(hdev, &hci_dev_list, list) {
354 struct sk_buff *skb;
355
356 skb = create_monitor_event(hdev, HCI_DEV_REG);
357 if (!skb)
358 continue;
359
360 if (sock_queue_rcv_skb(sk, skb))
361 kfree_skb(skb);
362 }
363
364 read_unlock(&hci_dev_list_lock);
365 }
366
367 /* Generate internal stack event */
368 static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
369 {
370 struct hci_event_hdr *hdr;
371 struct hci_ev_stack_internal *ev;
372 struct sk_buff *skb;
373
374 skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
375 if (!skb)
376 return;
377
378 hdr = (void *) skb_put(skb, HCI_EVENT_HDR_SIZE);
379 hdr->evt = HCI_EV_STACK_INTERNAL;
380 hdr->plen = sizeof(*ev) + dlen;
381
382 ev = (void *) skb_put(skb, sizeof(*ev) + dlen);
383 ev->type = type;
384 memcpy(ev->data, data, dlen);
385
386 bt_cb(skb)->incoming = 1;
387 __net_timestamp(skb);
388
389 bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
390 hci_send_to_sock(hdev, skb);
391 kfree_skb(skb);
392 }
393
394 void hci_sock_dev_event(struct hci_dev *hdev, int event)
395 {
396 struct hci_ev_si_device ev;
397
398 BT_DBG("hdev %s event %d", hdev->name, event);
399
400 /* Send event to monitor */
401 if (atomic_read(&monitor_promisc)) {
402 struct sk_buff *skb;
403
404 skb = create_monitor_event(hdev, event);
405 if (skb) {
406 send_monitor_event(skb);
407 kfree_skb(skb);
408 }
409 }
410
411 /* Send event to sockets */
412 ev.event = event;
413 ev.dev_id = hdev->id;
414 hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
415
416 if (event == HCI_DEV_UNREG) {
417 struct sock *sk;
418
419 /* Detach sockets from device */
420 read_lock(&hci_sk_list.lock);
421 sk_for_each(sk, &hci_sk_list.head) {
422 bh_lock_sock_nested(sk);
423 if (hci_pi(sk)->hdev == hdev) {
424 hci_pi(sk)->hdev = NULL;
425 sk->sk_err = EPIPE;
426 sk->sk_state = BT_OPEN;
427 sk->sk_state_change(sk);
428
429 hci_dev_put(hdev);
430 }
431 bh_unlock_sock(sk);
432 }
433 read_unlock(&hci_sk_list.lock);
434 }
435 }
436
437 static int hci_sock_release(struct socket *sock)
438 {
439 struct sock *sk = sock->sk;
440 struct hci_dev *hdev;
441
442 BT_DBG("sock %p sk %p", sock, sk);
443
444 if (!sk)
445 return 0;
446
447 hdev = hci_pi(sk)->hdev;
448
449 if (hci_pi(sk)->channel == HCI_CHANNEL_MONITOR)
450 atomic_dec(&monitor_promisc);
451
452 bt_sock_unlink(&hci_sk_list, sk);
453
454 if (hdev) {
455 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
456 mgmt_index_added(hdev);
457 clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
458 hci_dev_close(hdev->id);
459 }
460
461 atomic_dec(&hdev->promisc);
462 hci_dev_put(hdev);
463 }
464
465 sock_orphan(sk);
466
467 skb_queue_purge(&sk->sk_receive_queue);
468 skb_queue_purge(&sk->sk_write_queue);
469
470 sock_put(sk);
471 return 0;
472 }
473
474 static int hci_sock_blacklist_add(struct hci_dev *hdev, void __user *arg)
475 {
476 bdaddr_t bdaddr;
477 int err;
478
479 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
480 return -EFAULT;
481
482 hci_dev_lock(hdev);
483
484 err = hci_blacklist_add(hdev, &bdaddr, BDADDR_BREDR);
485
486 hci_dev_unlock(hdev);
487
488 return err;
489 }
490
491 static int hci_sock_blacklist_del(struct hci_dev *hdev, void __user *arg)
492 {
493 bdaddr_t bdaddr;
494 int err;
495
496 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
497 return -EFAULT;
498
499 hci_dev_lock(hdev);
500
501 err = hci_blacklist_del(hdev, &bdaddr, BDADDR_BREDR);
502
503 hci_dev_unlock(hdev);
504
505 return err;
506 }
507
508 /* Ioctls that require bound socket */
509 static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
510 unsigned long arg)
511 {
512 struct hci_dev *hdev = hci_pi(sk)->hdev;
513
514 if (!hdev)
515 return -EBADFD;
516
517 if (test_bit(HCI_USER_CHANNEL, &hdev->dev_flags))
518 return -EBUSY;
519
520 if (hdev->dev_type != HCI_BREDR)
521 return -EOPNOTSUPP;
522
523 switch (cmd) {
524 case HCISETRAW:
525 if (!capable(CAP_NET_ADMIN))
526 return -EPERM;
527 return -EOPNOTSUPP;
528
529 case HCIGETCONNINFO:
530 return hci_get_conn_info(hdev, (void __user *) arg);
531
532 case HCIGETAUTHINFO:
533 return hci_get_auth_info(hdev, (void __user *) arg);
534
535 case HCIBLOCKADDR:
536 if (!capable(CAP_NET_ADMIN))
537 return -EPERM;
538 return hci_sock_blacklist_add(hdev, (void __user *) arg);
539
540 case HCIUNBLOCKADDR:
541 if (!capable(CAP_NET_ADMIN))
542 return -EPERM;
543 return hci_sock_blacklist_del(hdev, (void __user *) arg);
544 }
545
546 return -ENOIOCTLCMD;
547 }
548
549 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
550 unsigned long arg)
551 {
552 void __user *argp = (void __user *) arg;
553 struct sock *sk = sock->sk;
554 int err;
555
556 BT_DBG("cmd %x arg %lx", cmd, arg);
557
558 lock_sock(sk);
559
560 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
561 err = -EBADFD;
562 goto done;
563 }
564
565 release_sock(sk);
566
567 switch (cmd) {
568 case HCIGETDEVLIST:
569 return hci_get_dev_list(argp);
570
571 case HCIGETDEVINFO:
572 return hci_get_dev_info(argp);
573
574 case HCIGETCONNLIST:
575 return hci_get_conn_list(argp);
576
577 case HCIDEVUP:
578 if (!capable(CAP_NET_ADMIN))
579 return -EPERM;
580 return hci_dev_open(arg);
581
582 case HCIDEVDOWN:
583 if (!capable(CAP_NET_ADMIN))
584 return -EPERM;
585 return hci_dev_close(arg);
586
587 case HCIDEVRESET:
588 if (!capable(CAP_NET_ADMIN))
589 return -EPERM;
590 return hci_dev_reset(arg);
591
592 case HCIDEVRESTAT:
593 if (!capable(CAP_NET_ADMIN))
594 return -EPERM;
595 return hci_dev_reset_stat(arg);
596
597 case HCISETSCAN:
598 case HCISETAUTH:
599 case HCISETENCRYPT:
600 case HCISETPTYPE:
601 case HCISETLINKPOL:
602 case HCISETLINKMODE:
603 case HCISETACLMTU:
604 case HCISETSCOMTU:
605 if (!capable(CAP_NET_ADMIN))
606 return -EPERM;
607 return hci_dev_cmd(cmd, argp);
608
609 case HCIINQUIRY:
610 return hci_inquiry(argp);
611 }
612
613 lock_sock(sk);
614
615 err = hci_sock_bound_ioctl(sk, cmd, arg);
616
617 done:
618 release_sock(sk);
619 return err;
620 }
621
622 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
623 int addr_len)
624 {
625 struct sockaddr_hci haddr;
626 struct sock *sk = sock->sk;
627 struct hci_dev *hdev = NULL;
628 int len, err = 0;
629
630 BT_DBG("sock %p sk %p", sock, sk);
631
632 if (!addr)
633 return -EINVAL;
634
635 memset(&haddr, 0, sizeof(haddr));
636 len = min_t(unsigned int, sizeof(haddr), addr_len);
637 memcpy(&haddr, addr, len);
638
639 if (haddr.hci_family != AF_BLUETOOTH)
640 return -EINVAL;
641
642 lock_sock(sk);
643
644 if (sk->sk_state == BT_BOUND) {
645 err = -EALREADY;
646 goto done;
647 }
648
649 switch (haddr.hci_channel) {
650 case HCI_CHANNEL_RAW:
651 if (hci_pi(sk)->hdev) {
652 err = -EALREADY;
653 goto done;
654 }
655
656 if (haddr.hci_dev != HCI_DEV_NONE) {
657 hdev = hci_dev_get(haddr.hci_dev);
658 if (!hdev) {
659 err = -ENODEV;
660 goto done;
661 }
662
663 atomic_inc(&hdev->promisc);
664 }
665
666 hci_pi(sk)->hdev = hdev;
667 break;
668
669 case HCI_CHANNEL_USER:
670 if (hci_pi(sk)->hdev) {
671 err = -EALREADY;
672 goto done;
673 }
674
675 if (haddr.hci_dev == HCI_DEV_NONE) {
676 err = -EINVAL;
677 goto done;
678 }
679
680 if (!capable(CAP_NET_ADMIN)) {
681 err = -EPERM;
682 goto done;
683 }
684
685 hdev = hci_dev_get(haddr.hci_dev);
686 if (!hdev) {
687 err = -ENODEV;
688 goto done;
689 }
690
691 if (test_bit(HCI_UP, &hdev->flags) ||
692 test_bit(HCI_INIT, &hdev->flags) ||
693 test_bit(HCI_SETUP, &hdev->dev_flags)) {
694 err = -EBUSY;
695 hci_dev_put(hdev);
696 goto done;
697 }
698
699 if (test_and_set_bit(HCI_USER_CHANNEL, &hdev->dev_flags)) {
700 err = -EUSERS;
701 hci_dev_put(hdev);
702 goto done;
703 }
704
705 mgmt_index_removed(hdev);
706
707 err = hci_dev_open(hdev->id);
708 if (err) {
709 clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
710 mgmt_index_added(hdev);
711 hci_dev_put(hdev);
712 goto done;
713 }
714
715 atomic_inc(&hdev->promisc);
716
717 hci_pi(sk)->hdev = hdev;
718 break;
719
720 case HCI_CHANNEL_CONTROL:
721 if (haddr.hci_dev != HCI_DEV_NONE) {
722 err = -EINVAL;
723 goto done;
724 }
725
726 if (!capable(CAP_NET_ADMIN)) {
727 err = -EPERM;
728 goto done;
729 }
730
731 break;
732
733 case HCI_CHANNEL_MONITOR:
734 if (haddr.hci_dev != HCI_DEV_NONE) {
735 err = -EINVAL;
736 goto done;
737 }
738
739 if (!capable(CAP_NET_RAW)) {
740 err = -EPERM;
741 goto done;
742 }
743
744 send_monitor_replay(sk);
745
746 atomic_inc(&monitor_promisc);
747 break;
748
749 default:
750 err = -EINVAL;
751 goto done;
752 }
753
754
755 hci_pi(sk)->channel = haddr.hci_channel;
756 sk->sk_state = BT_BOUND;
757
758 done:
759 release_sock(sk);
760 return err;
761 }
762
763 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
764 int *addr_len, int peer)
765 {
766 struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
767 struct sock *sk = sock->sk;
768 struct hci_dev *hdev;
769 int err = 0;
770
771 BT_DBG("sock %p sk %p", sock, sk);
772
773 if (peer)
774 return -EOPNOTSUPP;
775
776 lock_sock(sk);
777
778 hdev = hci_pi(sk)->hdev;
779 if (!hdev) {
780 err = -EBADFD;
781 goto done;
782 }
783
784 *addr_len = sizeof(*haddr);
785 haddr->hci_family = AF_BLUETOOTH;
786 haddr->hci_dev = hdev->id;
787 haddr->hci_channel= hci_pi(sk)->channel;
788
789 done:
790 release_sock(sk);
791 return err;
792 }
793
794 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
795 struct sk_buff *skb)
796 {
797 __u32 mask = hci_pi(sk)->cmsg_mask;
798
799 if (mask & HCI_CMSG_DIR) {
800 int incoming = bt_cb(skb)->incoming;
801 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
802 &incoming);
803 }
804
805 if (mask & HCI_CMSG_TSTAMP) {
806 #ifdef CONFIG_COMPAT
807 struct compat_timeval ctv;
808 #endif
809 struct timeval tv;
810 void *data;
811 int len;
812
813 skb_get_timestamp(skb, &tv);
814
815 data = &tv;
816 len = sizeof(tv);
817 #ifdef CONFIG_COMPAT
818 if (!COMPAT_USE_64BIT_TIME &&
819 (msg->msg_flags & MSG_CMSG_COMPAT)) {
820 ctv.tv_sec = tv.tv_sec;
821 ctv.tv_usec = tv.tv_usec;
822 data = &ctv;
823 len = sizeof(ctv);
824 }
825 #endif
826
827 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
828 }
829 }
830
831 static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
832 struct msghdr *msg, size_t len, int flags)
833 {
834 int noblock = flags & MSG_DONTWAIT;
835 struct sock *sk = sock->sk;
836 struct sk_buff *skb;
837 int copied, err;
838
839 BT_DBG("sock %p, sk %p", sock, sk);
840
841 if (flags & (MSG_OOB))
842 return -EOPNOTSUPP;
843
844 if (sk->sk_state == BT_CLOSED)
845 return 0;
846
847 skb = skb_recv_datagram(sk, flags, noblock, &err);
848 if (!skb)
849 return err;
850
851 copied = skb->len;
852 if (len < copied) {
853 msg->msg_flags |= MSG_TRUNC;
854 copied = len;
855 }
856
857 skb_reset_transport_header(skb);
858 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
859
860 switch (hci_pi(sk)->channel) {
861 case HCI_CHANNEL_RAW:
862 hci_sock_cmsg(sk, msg, skb);
863 break;
864 case HCI_CHANNEL_USER:
865 case HCI_CHANNEL_CONTROL:
866 case HCI_CHANNEL_MONITOR:
867 sock_recv_timestamp(msg, sk, skb);
868 break;
869 }
870
871 skb_free_datagram(sk, skb);
872
873 return err ? : copied;
874 }
875
876 static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
877 struct msghdr *msg, size_t len)
878 {
879 struct sock *sk = sock->sk;
880 struct hci_dev *hdev;
881 struct sk_buff *skb;
882 int err;
883
884 BT_DBG("sock %p sk %p", sock, sk);
885
886 if (msg->msg_flags & MSG_OOB)
887 return -EOPNOTSUPP;
888
889 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
890 return -EINVAL;
891
892 if (len < 4 || len > HCI_MAX_FRAME_SIZE)
893 return -EINVAL;
894
895 lock_sock(sk);
896
897 switch (hci_pi(sk)->channel) {
898 case HCI_CHANNEL_RAW:
899 case HCI_CHANNEL_USER:
900 break;
901 case HCI_CHANNEL_CONTROL:
902 err = mgmt_control(sk, msg, len);
903 goto done;
904 case HCI_CHANNEL_MONITOR:
905 err = -EOPNOTSUPP;
906 goto done;
907 default:
908 err = -EINVAL;
909 goto done;
910 }
911
912 hdev = hci_pi(sk)->hdev;
913 if (!hdev) {
914 err = -EBADFD;
915 goto done;
916 }
917
918 if (!test_bit(HCI_UP, &hdev->flags)) {
919 err = -ENETDOWN;
920 goto done;
921 }
922
923 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
924 if (!skb)
925 goto done;
926
927 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
928 err = -EFAULT;
929 goto drop;
930 }
931
932 bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
933 skb_pull(skb, 1);
934
935 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
936 /* No permission check is needed for user channel
937 * since that gets enforced when binding the socket.
938 *
939 * However check that the packet type is valid.
940 */
941 if (bt_cb(skb)->pkt_type != HCI_COMMAND_PKT &&
942 bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
943 bt_cb(skb)->pkt_type != HCI_SCODATA_PKT) {
944 err = -EINVAL;
945 goto drop;
946 }
947
948 skb_queue_tail(&hdev->raw_q, skb);
949 queue_work(hdev->workqueue, &hdev->tx_work);
950 } else if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
951 u16 opcode = get_unaligned_le16(skb->data);
952 u16 ogf = hci_opcode_ogf(opcode);
953 u16 ocf = hci_opcode_ocf(opcode);
954
955 if (((ogf > HCI_SFLT_MAX_OGF) ||
956 !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
957 &hci_sec_filter.ocf_mask[ogf])) &&
958 !capable(CAP_NET_RAW)) {
959 err = -EPERM;
960 goto drop;
961 }
962
963 if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
964 skb_queue_tail(&hdev->raw_q, skb);
965 queue_work(hdev->workqueue, &hdev->tx_work);
966 } else {
967 /* Stand-alone HCI commands must be flaged as
968 * single-command requests.
969 */
970 bt_cb(skb)->req.start = true;
971
972 skb_queue_tail(&hdev->cmd_q, skb);
973 queue_work(hdev->workqueue, &hdev->cmd_work);
974 }
975 } else {
976 if (!capable(CAP_NET_RAW)) {
977 err = -EPERM;
978 goto drop;
979 }
980
981 skb_queue_tail(&hdev->raw_q, skb);
982 queue_work(hdev->workqueue, &hdev->tx_work);
983 }
984
985 err = len;
986
987 done:
988 release_sock(sk);
989 return err;
990
991 drop:
992 kfree_skb(skb);
993 goto done;
994 }
995
996 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
997 char __user *optval, unsigned int len)
998 {
999 struct hci_ufilter uf = { .opcode = 0 };
1000 struct sock *sk = sock->sk;
1001 int err = 0, opt = 0;
1002
1003 BT_DBG("sk %p, opt %d", sk, optname);
1004
1005 lock_sock(sk);
1006
1007 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1008 err = -EBADFD;
1009 goto done;
1010 }
1011
1012 switch (optname) {
1013 case HCI_DATA_DIR:
1014 if (get_user(opt, (int __user *)optval)) {
1015 err = -EFAULT;
1016 break;
1017 }
1018
1019 if (opt)
1020 hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1021 else
1022 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1023 break;
1024
1025 case HCI_TIME_STAMP:
1026 if (get_user(opt, (int __user *)optval)) {
1027 err = -EFAULT;
1028 break;
1029 }
1030
1031 if (opt)
1032 hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1033 else
1034 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1035 break;
1036
1037 case HCI_FILTER:
1038 {
1039 struct hci_filter *f = &hci_pi(sk)->filter;
1040
1041 uf.type_mask = f->type_mask;
1042 uf.opcode = f->opcode;
1043 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1044 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1045 }
1046
1047 len = min_t(unsigned int, len, sizeof(uf));
1048 if (copy_from_user(&uf, optval, len)) {
1049 err = -EFAULT;
1050 break;
1051 }
1052
1053 if (!capable(CAP_NET_RAW)) {
1054 uf.type_mask &= hci_sec_filter.type_mask;
1055 uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1056 uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1057 }
1058
1059 {
1060 struct hci_filter *f = &hci_pi(sk)->filter;
1061
1062 f->type_mask = uf.type_mask;
1063 f->opcode = uf.opcode;
1064 *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1065 *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1066 }
1067 break;
1068
1069 default:
1070 err = -ENOPROTOOPT;
1071 break;
1072 }
1073
1074 done:
1075 release_sock(sk);
1076 return err;
1077 }
1078
1079 static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
1080 char __user *optval, int __user *optlen)
1081 {
1082 struct hci_ufilter uf;
1083 struct sock *sk = sock->sk;
1084 int len, opt, err = 0;
1085
1086 BT_DBG("sk %p, opt %d", sk, optname);
1087
1088 if (get_user(len, optlen))
1089 return -EFAULT;
1090
1091 lock_sock(sk);
1092
1093 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1094 err = -EBADFD;
1095 goto done;
1096 }
1097
1098 switch (optname) {
1099 case HCI_DATA_DIR:
1100 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1101 opt = 1;
1102 else
1103 opt = 0;
1104
1105 if (put_user(opt, optval))
1106 err = -EFAULT;
1107 break;
1108
1109 case HCI_TIME_STAMP:
1110 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1111 opt = 1;
1112 else
1113 opt = 0;
1114
1115 if (put_user(opt, optval))
1116 err = -EFAULT;
1117 break;
1118
1119 case HCI_FILTER:
1120 {
1121 struct hci_filter *f = &hci_pi(sk)->filter;
1122
1123 memset(&uf, 0, sizeof(uf));
1124 uf.type_mask = f->type_mask;
1125 uf.opcode = f->opcode;
1126 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1127 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1128 }
1129
1130 len = min_t(unsigned int, len, sizeof(uf));
1131 if (copy_to_user(optval, &uf, len))
1132 err = -EFAULT;
1133 break;
1134
1135 default:
1136 err = -ENOPROTOOPT;
1137 break;
1138 }
1139
1140 done:
1141 release_sock(sk);
1142 return err;
1143 }
1144
1145 static const struct proto_ops hci_sock_ops = {
1146 .family = PF_BLUETOOTH,
1147 .owner = THIS_MODULE,
1148 .release = hci_sock_release,
1149 .bind = hci_sock_bind,
1150 .getname = hci_sock_getname,
1151 .sendmsg = hci_sock_sendmsg,
1152 .recvmsg = hci_sock_recvmsg,
1153 .ioctl = hci_sock_ioctl,
1154 .poll = datagram_poll,
1155 .listen = sock_no_listen,
1156 .shutdown = sock_no_shutdown,
1157 .setsockopt = hci_sock_setsockopt,
1158 .getsockopt = hci_sock_getsockopt,
1159 .connect = sock_no_connect,
1160 .socketpair = sock_no_socketpair,
1161 .accept = sock_no_accept,
1162 .mmap = sock_no_mmap
1163 };
1164
1165 static struct proto hci_sk_proto = {
1166 .name = "HCI",
1167 .owner = THIS_MODULE,
1168 .obj_size = sizeof(struct hci_pinfo)
1169 };
1170
1171 static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
1172 int kern)
1173 {
1174 struct sock *sk;
1175
1176 BT_DBG("sock %p", sock);
1177
1178 if (sock->type != SOCK_RAW)
1179 return -ESOCKTNOSUPPORT;
1180
1181 sock->ops = &hci_sock_ops;
1182
1183 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
1184 if (!sk)
1185 return -ENOMEM;
1186
1187 sock_init_data(sock, sk);
1188
1189 sock_reset_flag(sk, SOCK_ZAPPED);
1190
1191 sk->sk_protocol = protocol;
1192
1193 sock->state = SS_UNCONNECTED;
1194 sk->sk_state = BT_OPEN;
1195
1196 bt_sock_link(&hci_sk_list, sk);
1197 return 0;
1198 }
1199
1200 static const struct net_proto_family hci_sock_family_ops = {
1201 .family = PF_BLUETOOTH,
1202 .owner = THIS_MODULE,
1203 .create = hci_sock_create,
1204 };
1205
1206 int __init hci_sock_init(void)
1207 {
1208 int err;
1209
1210 err = proto_register(&hci_sk_proto, 0);
1211 if (err < 0)
1212 return err;
1213
1214 err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
1215 if (err < 0) {
1216 BT_ERR("HCI socket registration failed");
1217 goto error;
1218 }
1219
1220 err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1221 if (err < 0) {
1222 BT_ERR("Failed to create HCI proc file");
1223 bt_sock_unregister(BTPROTO_HCI);
1224 goto error;
1225 }
1226
1227 BT_INFO("HCI socket layer initialized");
1228
1229 return 0;
1230
1231 error:
1232 proto_unregister(&hci_sk_proto);
1233 return err;
1234 }
1235
1236 void hci_sock_cleanup(void)
1237 {
1238 bt_procfs_cleanup(&init_net, "hci");
1239 bt_sock_unregister(BTPROTO_HCI);
1240 proto_unregister(&hci_sk_proto);
1241 }
Linux kernel - Deliverables
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