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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 <linux/utsname.h>
29#include <linux/sched.h>
30#include <asm/unaligned.h>
31
32#include <net/bluetooth/bluetooth.h>
33#include <net/bluetooth/hci_core.h>
34#include <net/bluetooth/hci_mon.h>
35#include <net/bluetooth/mgmt.h>
36
37#include "mgmt_util.h"
38
39static LIST_HEAD(mgmt_chan_list);
40static DEFINE_MUTEX(mgmt_chan_list_lock);
41
42static DEFINE_IDA(sock_cookie_ida);
43
44static atomic_t monitor_promisc = ATOMIC_INIT(0);
45
46/* ----- HCI socket interface ----- */
47
48/* Socket info */
49#define hci_pi(sk) ((struct hci_pinfo *) sk)
50
51struct hci_pinfo {
52 struct bt_sock bt;
53 struct hci_dev *hdev;
54 struct hci_filter filter;
55 __u32 cmsg_mask;
56 unsigned short channel;
57 unsigned long flags;
58 __u32 cookie;
59 char comm[TASK_COMM_LEN];
60};
61
62void hci_sock_set_flag(struct sock *sk, int nr)
63{
64 set_bit(nr, &hci_pi(sk)->flags);
65}
66
67void hci_sock_clear_flag(struct sock *sk, int nr)
68{
69 clear_bit(nr, &hci_pi(sk)->flags);
70}
71
72int hci_sock_test_flag(struct sock *sk, int nr)
73{
74 return test_bit(nr, &hci_pi(sk)->flags);
75}
76
77unsigned short hci_sock_get_channel(struct sock *sk)
78{
79 return hci_pi(sk)->channel;
80}
81
82u32 hci_sock_get_cookie(struct sock *sk)
83{
84 return hci_pi(sk)->cookie;
85}
86
87static bool hci_sock_gen_cookie(struct sock *sk)
88{
89 int id = hci_pi(sk)->cookie;
90
91 if (!id) {
92 id = ida_simple_get(&sock_cookie_ida, 1, 0, GFP_KERNEL);
93 if (id < 0)
94 id = 0xffffffff;
95
96 hci_pi(sk)->cookie = id;
97 get_task_comm(hci_pi(sk)->comm, current);
98 return true;
99 }
100
101 return false;
102}
103
104static void hci_sock_free_cookie(struct sock *sk)
105{
106 int id = hci_pi(sk)->cookie;
107
108 if (id) {
109 hci_pi(sk)->cookie = 0xffffffff;
110 ida_simple_remove(&sock_cookie_ida, id);
111 }
112}
113
114static inline int hci_test_bit(int nr, const void *addr)
115{
116 return *((const __u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
117}
118
119/* Security filter */
120#define HCI_SFLT_MAX_OGF 5
121
122struct hci_sec_filter {
123 __u32 type_mask;
124 __u32 event_mask[2];
125 __u32 ocf_mask[HCI_SFLT_MAX_OGF + 1][4];
126};
127
128static const struct hci_sec_filter hci_sec_filter = {
129 /* Packet types */
130 0x10,
131 /* Events */
132 { 0x1000d9fe, 0x0000b00c },
133 /* Commands */
134 {
135 { 0x0 },
136 /* OGF_LINK_CTL */
137 { 0xbe000006, 0x00000001, 0x00000000, 0x00 },
138 /* OGF_LINK_POLICY */
139 { 0x00005200, 0x00000000, 0x00000000, 0x00 },
140 /* OGF_HOST_CTL */
141 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
142 /* OGF_INFO_PARAM */
143 { 0x000002be, 0x00000000, 0x00000000, 0x00 },
144 /* OGF_STATUS_PARAM */
145 { 0x000000ea, 0x00000000, 0x00000000, 0x00 }
146 }
147};
148
149static struct bt_sock_list hci_sk_list = {
150 .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
151};
152
153static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb)
154{
155 struct hci_filter *flt;
156 int flt_type, flt_event;
157
158 /* Apply filter */
159 flt = &hci_pi(sk)->filter;
160
161 flt_type = hci_skb_pkt_type(skb) & HCI_FLT_TYPE_BITS;
162
163 if (!test_bit(flt_type, &flt->type_mask))
164 return true;
165
166 /* Extra filter for event packets only */
167 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT)
168 return false;
169
170 flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
171
172 if (!hci_test_bit(flt_event, &flt->event_mask))
173 return true;
174
175 /* Check filter only when opcode is set */
176 if (!flt->opcode)
177 return false;
178
179 if (flt_event == HCI_EV_CMD_COMPLETE &&
180 flt->opcode != get_unaligned((__le16 *)(skb->data + 3)))
181 return true;
182
183 if (flt_event == HCI_EV_CMD_STATUS &&
184 flt->opcode != get_unaligned((__le16 *)(skb->data + 4)))
185 return true;
186
187 return false;
188}
189
190/* Send frame to RAW socket */
191void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
192{
193 struct sock *sk;
194 struct sk_buff *skb_copy = NULL;
195
196 BT_DBG("hdev %p len %d", hdev, skb->len);
197
198 read_lock(&hci_sk_list.lock);
199
200 sk_for_each(sk, &hci_sk_list.head) {
201 struct sk_buff *nskb;
202
203 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
204 continue;
205
206 /* Don't send frame to the socket it came from */
207 if (skb->sk == sk)
208 continue;
209
210 if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
211 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
212 hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
213 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
214 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT)
215 continue;
216 if (is_filtered_packet(sk, skb))
217 continue;
218 } else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
219 if (!bt_cb(skb)->incoming)
220 continue;
221 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
222 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
223 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT)
224 continue;
225 } else {
226 /* Don't send frame to other channel types */
227 continue;
228 }
229
230 if (!skb_copy) {
231 /* Create a private copy with headroom */
232 skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
233 if (!skb_copy)
234 continue;
235
236 /* Put type byte before the data */
237 memcpy(skb_push(skb_copy, 1), &hci_skb_pkt_type(skb), 1);
238 }
239
240 nskb = skb_clone(skb_copy, GFP_ATOMIC);
241 if (!nskb)
242 continue;
243
244 if (sock_queue_rcv_skb(sk, nskb))
245 kfree_skb(nskb);
246 }
247
248 read_unlock(&hci_sk_list.lock);
249
250 kfree_skb(skb_copy);
251}
252
253/* Send frame to sockets with specific channel */
254static void __hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
255 int flag, struct sock *skip_sk)
256{
257 struct sock *sk;
258
259 BT_DBG("channel %u len %d", channel, skb->len);
260
261 sk_for_each(sk, &hci_sk_list.head) {
262 struct sk_buff *nskb;
263
264 /* Ignore socket without the flag set */
265 if (!hci_sock_test_flag(sk, flag))
266 continue;
267
268 /* Skip the original socket */
269 if (sk == skip_sk)
270 continue;
271
272 if (sk->sk_state != BT_BOUND)
273 continue;
274
275 if (hci_pi(sk)->channel != channel)
276 continue;
277
278 nskb = skb_clone(skb, GFP_ATOMIC);
279 if (!nskb)
280 continue;
281
282 if (sock_queue_rcv_skb(sk, nskb))
283 kfree_skb(nskb);
284 }
285
286}
287
288void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
289 int flag, struct sock *skip_sk)
290{
291 read_lock(&hci_sk_list.lock);
292 __hci_send_to_channel(channel, skb, flag, skip_sk);
293 read_unlock(&hci_sk_list.lock);
294}
295
296/* Send frame to monitor socket */
297void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
298{
299 struct sk_buff *skb_copy = NULL;
300 struct hci_mon_hdr *hdr;
301 __le16 opcode;
302
303 if (!atomic_read(&monitor_promisc))
304 return;
305
306 BT_DBG("hdev %p len %d", hdev, skb->len);
307
308 switch (hci_skb_pkt_type(skb)) {
309 case HCI_COMMAND_PKT:
310 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
311 break;
312 case HCI_EVENT_PKT:
313 opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
314 break;
315 case HCI_ACLDATA_PKT:
316 if (bt_cb(skb)->incoming)
317 opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
318 else
319 opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
320 break;
321 case HCI_SCODATA_PKT:
322 if (bt_cb(skb)->incoming)
323 opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
324 else
325 opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
326 break;
327 case HCI_DIAG_PKT:
328 opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG);
329 break;
330 default:
331 return;
332 }
333
334 /* Create a private copy with headroom */
335 skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE, GFP_ATOMIC, true);
336 if (!skb_copy)
337 return;
338
339 /* Put header before the data */
340 hdr = skb_push(skb_copy, HCI_MON_HDR_SIZE);
341 hdr->opcode = opcode;
342 hdr->index = cpu_to_le16(hdev->id);
343 hdr->len = cpu_to_le16(skb->len);
344
345 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
346 HCI_SOCK_TRUSTED, NULL);
347 kfree_skb(skb_copy);
348}
349
350void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
351 void *data, u16 data_len, ktime_t tstamp,
352 int flag, struct sock *skip_sk)
353{
354 struct sock *sk;
355 __le16 index;
356
357 if (hdev)
358 index = cpu_to_le16(hdev->id);
359 else
360 index = cpu_to_le16(MGMT_INDEX_NONE);
361
362 read_lock(&hci_sk_list.lock);
363
364 sk_for_each(sk, &hci_sk_list.head) {
365 struct hci_mon_hdr *hdr;
366 struct sk_buff *skb;
367
368 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
369 continue;
370
371 /* Ignore socket without the flag set */
372 if (!hci_sock_test_flag(sk, flag))
373 continue;
374
375 /* Skip the original socket */
376 if (sk == skip_sk)
377 continue;
378
379 skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC);
380 if (!skb)
381 continue;
382
383 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
384 put_unaligned_le16(event, skb_put(skb, 2));
385
386 if (data)
387 skb_put_data(skb, data, data_len);
388
389 skb->tstamp = tstamp;
390
391 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
392 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
393 hdr->index = index;
394 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
395
396 __hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
397 HCI_SOCK_TRUSTED, NULL);
398 kfree_skb(skb);
399 }
400
401 read_unlock(&hci_sk_list.lock);
402}
403
404static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
405{
406 struct hci_mon_hdr *hdr;
407 struct hci_mon_new_index *ni;
408 struct hci_mon_index_info *ii;
409 struct sk_buff *skb;
410 __le16 opcode;
411
412 switch (event) {
413 case HCI_DEV_REG:
414 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
415 if (!skb)
416 return NULL;
417
418 ni = skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
419 ni->type = hdev->dev_type;
420 ni->bus = hdev->bus;
421 bacpy(&ni->bdaddr, &hdev->bdaddr);
422 memcpy(ni->name, hdev->name, 8);
423
424 opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
425 break;
426
427 case HCI_DEV_UNREG:
428 skb = bt_skb_alloc(0, GFP_ATOMIC);
429 if (!skb)
430 return NULL;
431
432 opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
433 break;
434
435 case HCI_DEV_SETUP:
436 if (hdev->manufacturer == 0xffff)
437 return NULL;
438
439 /* fall through */
440
441 case HCI_DEV_UP:
442 skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
443 if (!skb)
444 return NULL;
445
446 ii = skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
447 bacpy(&ii->bdaddr, &hdev->bdaddr);
448 ii->manufacturer = cpu_to_le16(hdev->manufacturer);
449
450 opcode = cpu_to_le16(HCI_MON_INDEX_INFO);
451 break;
452
453 case HCI_DEV_OPEN:
454 skb = bt_skb_alloc(0, GFP_ATOMIC);
455 if (!skb)
456 return NULL;
457
458 opcode = cpu_to_le16(HCI_MON_OPEN_INDEX);
459 break;
460
461 case HCI_DEV_CLOSE:
462 skb = bt_skb_alloc(0, GFP_ATOMIC);
463 if (!skb)
464 return NULL;
465
466 opcode = cpu_to_le16(HCI_MON_CLOSE_INDEX);
467 break;
468
469 default:
470 return NULL;
471 }
472
473 __net_timestamp(skb);
474
475 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
476 hdr->opcode = opcode;
477 hdr->index = cpu_to_le16(hdev->id);
478 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
479
480 return skb;
481}
482
483static struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
484{
485 struct hci_mon_hdr *hdr;
486 struct sk_buff *skb;
487 u16 format;
488 u8 ver[3];
489 u32 flags;
490
491 /* No message needed when cookie is not present */
492 if (!hci_pi(sk)->cookie)
493 return NULL;
494
495 switch (hci_pi(sk)->channel) {
496 case HCI_CHANNEL_RAW:
497 format = 0x0000;
498 ver[0] = BT_SUBSYS_VERSION;
499 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
500 break;
501 case HCI_CHANNEL_USER:
502 format = 0x0001;
503 ver[0] = BT_SUBSYS_VERSION;
504 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
505 break;
506 case HCI_CHANNEL_CONTROL:
507 format = 0x0002;
508 mgmt_fill_version_info(ver);
509 break;
510 default:
511 /* No message for unsupported format */
512 return NULL;
513 }
514
515 skb = bt_skb_alloc(14 + TASK_COMM_LEN , GFP_ATOMIC);
516 if (!skb)
517 return NULL;
518
519 flags = hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) ? 0x1 : 0x0;
520
521 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
522 put_unaligned_le16(format, skb_put(skb, 2));
523 skb_put_data(skb, ver, sizeof(ver));
524 put_unaligned_le32(flags, skb_put(skb, 4));
525 skb_put_u8(skb, TASK_COMM_LEN);
526 skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN);
527
528 __net_timestamp(skb);
529
530 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
531 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_OPEN);
532 if (hci_pi(sk)->hdev)
533 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
534 else
535 hdr->index = cpu_to_le16(HCI_DEV_NONE);
536 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
537
538 return skb;
539}
540
541static struct sk_buff *create_monitor_ctrl_close(struct sock *sk)
542{
543 struct hci_mon_hdr *hdr;
544 struct sk_buff *skb;
545
546 /* No message needed when cookie is not present */
547 if (!hci_pi(sk)->cookie)
548 return NULL;
549
550 switch (hci_pi(sk)->channel) {
551 case HCI_CHANNEL_RAW:
552 case HCI_CHANNEL_USER:
553 case HCI_CHANNEL_CONTROL:
554 break;
555 default:
556 /* No message for unsupported format */
557 return NULL;
558 }
559
560 skb = bt_skb_alloc(4, GFP_ATOMIC);
561 if (!skb)
562 return NULL;
563
564 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
565
566 __net_timestamp(skb);
567
568 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
569 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_CLOSE);
570 if (hci_pi(sk)->hdev)
571 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
572 else
573 hdr->index = cpu_to_le16(HCI_DEV_NONE);
574 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
575
576 return skb;
577}
578
579static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index,
580 u16 opcode, u16 len,
581 const void *buf)
582{
583 struct hci_mon_hdr *hdr;
584 struct sk_buff *skb;
585
586 skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
587 if (!skb)
588 return NULL;
589
590 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
591 put_unaligned_le16(opcode, skb_put(skb, 2));
592
593 if (buf)
594 skb_put_data(skb, buf, len);
595
596 __net_timestamp(skb);
597
598 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
599 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND);
600 hdr->index = cpu_to_le16(index);
601 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
602
603 return skb;
604}
605
606static void __printf(2, 3)
607send_monitor_note(struct sock *sk, const char *fmt, ...)
608{
609 size_t len;
610 struct hci_mon_hdr *hdr;
611 struct sk_buff *skb;
612 va_list args;
613
614 va_start(args, fmt);
615 len = vsnprintf(NULL, 0, fmt, args);
616 va_end(args);
617
618 skb = bt_skb_alloc(len + 1, GFP_ATOMIC);
619 if (!skb)
620 return;
621
622 va_start(args, fmt);
623 vsprintf(skb_put(skb, len), fmt, args);
624 *(u8 *)skb_put(skb, 1) = 0;
625 va_end(args);
626
627 __net_timestamp(skb);
628
629 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
630 hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE);
631 hdr->index = cpu_to_le16(HCI_DEV_NONE);
632 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
633
634 if (sock_queue_rcv_skb(sk, skb))
635 kfree_skb(skb);
636}
637
638static void send_monitor_replay(struct sock *sk)
639{
640 struct hci_dev *hdev;
641
642 read_lock(&hci_dev_list_lock);
643
644 list_for_each_entry(hdev, &hci_dev_list, list) {
645 struct sk_buff *skb;
646
647 skb = create_monitor_event(hdev, HCI_DEV_REG);
648 if (!skb)
649 continue;
650
651 if (sock_queue_rcv_skb(sk, skb))
652 kfree_skb(skb);
653
654 if (!test_bit(HCI_RUNNING, &hdev->flags))
655 continue;
656
657 skb = create_monitor_event(hdev, HCI_DEV_OPEN);
658 if (!skb)
659 continue;
660
661 if (sock_queue_rcv_skb(sk, skb))
662 kfree_skb(skb);
663
664 if (test_bit(HCI_UP, &hdev->flags))
665 skb = create_monitor_event(hdev, HCI_DEV_UP);
666 else if (hci_dev_test_flag(hdev, HCI_SETUP))
667 skb = create_monitor_event(hdev, HCI_DEV_SETUP);
668 else
669 skb = NULL;
670
671 if (skb) {
672 if (sock_queue_rcv_skb(sk, skb))
673 kfree_skb(skb);
674 }
675 }
676
677 read_unlock(&hci_dev_list_lock);
678}
679
680static void send_monitor_control_replay(struct sock *mon_sk)
681{
682 struct sock *sk;
683
684 read_lock(&hci_sk_list.lock);
685
686 sk_for_each(sk, &hci_sk_list.head) {
687 struct sk_buff *skb;
688
689 skb = create_monitor_ctrl_open(sk);
690 if (!skb)
691 continue;
692
693 if (sock_queue_rcv_skb(mon_sk, skb))
694 kfree_skb(skb);
695 }
696
697 read_unlock(&hci_sk_list.lock);
698}
699
700/* Generate internal stack event */
701static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
702{
703 struct hci_event_hdr *hdr;
704 struct hci_ev_stack_internal *ev;
705 struct sk_buff *skb;
706
707 skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
708 if (!skb)
709 return;
710
711 hdr = skb_put(skb, HCI_EVENT_HDR_SIZE);
712 hdr->evt = HCI_EV_STACK_INTERNAL;
713 hdr->plen = sizeof(*ev) + dlen;
714
715 ev = skb_put(skb, sizeof(*ev) + dlen);
716 ev->type = type;
717 memcpy(ev->data, data, dlen);
718
719 bt_cb(skb)->incoming = 1;
720 __net_timestamp(skb);
721
722 hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
723 hci_send_to_sock(hdev, skb);
724 kfree_skb(skb);
725}
726
727void hci_sock_dev_event(struct hci_dev *hdev, int event)
728{
729 BT_DBG("hdev %s event %d", hdev->name, event);
730
731 if (atomic_read(&monitor_promisc)) {
732 struct sk_buff *skb;
733
734 /* Send event to monitor */
735 skb = create_monitor_event(hdev, event);
736 if (skb) {
737 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
738 HCI_SOCK_TRUSTED, NULL);
739 kfree_skb(skb);
740 }
741 }
742
743 if (event <= HCI_DEV_DOWN) {
744 struct hci_ev_si_device ev;
745
746 /* Send event to sockets */
747 ev.event = event;
748 ev.dev_id = hdev->id;
749 hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
750 }
751
752 if (event == HCI_DEV_UNREG) {
753 struct sock *sk;
754
755 /* Detach sockets from device */
756 read_lock(&hci_sk_list.lock);
757 sk_for_each(sk, &hci_sk_list.head) {
758 bh_lock_sock_nested(sk);
759 if (hci_pi(sk)->hdev == hdev) {
760 hci_pi(sk)->hdev = NULL;
761 sk->sk_err = EPIPE;
762 sk->sk_state = BT_OPEN;
763 sk->sk_state_change(sk);
764
765 hci_dev_put(hdev);
766 }
767 bh_unlock_sock(sk);
768 }
769 read_unlock(&hci_sk_list.lock);
770 }
771}
772
773static struct hci_mgmt_chan *__hci_mgmt_chan_find(unsigned short channel)
774{
775 struct hci_mgmt_chan *c;
776
777 list_for_each_entry(c, &mgmt_chan_list, list) {
778 if (c->channel == channel)
779 return c;
780 }
781
782 return NULL;
783}
784
785static struct hci_mgmt_chan *hci_mgmt_chan_find(unsigned short channel)
786{
787 struct hci_mgmt_chan *c;
788
789 mutex_lock(&mgmt_chan_list_lock);
790 c = __hci_mgmt_chan_find(channel);
791 mutex_unlock(&mgmt_chan_list_lock);
792
793 return c;
794}
795
796int hci_mgmt_chan_register(struct hci_mgmt_chan *c)
797{
798 if (c->channel < HCI_CHANNEL_CONTROL)
799 return -EINVAL;
800
801 mutex_lock(&mgmt_chan_list_lock);
802 if (__hci_mgmt_chan_find(c->channel)) {
803 mutex_unlock(&mgmt_chan_list_lock);
804 return -EALREADY;
805 }
806
807 list_add_tail(&c->list, &mgmt_chan_list);
808
809 mutex_unlock(&mgmt_chan_list_lock);
810
811 return 0;
812}
813EXPORT_SYMBOL(hci_mgmt_chan_register);
814
815void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c)
816{
817 mutex_lock(&mgmt_chan_list_lock);
818 list_del(&c->list);
819 mutex_unlock(&mgmt_chan_list_lock);
820}
821EXPORT_SYMBOL(hci_mgmt_chan_unregister);
822
823static int hci_sock_release(struct socket *sock)
824{
825 struct sock *sk = sock->sk;
826 struct hci_dev *hdev;
827 struct sk_buff *skb;
828
829 BT_DBG("sock %p sk %p", sock, sk);
830
831 if (!sk)
832 return 0;
833
834 switch (hci_pi(sk)->channel) {
835 case HCI_CHANNEL_MONITOR:
836 atomic_dec(&monitor_promisc);
837 break;
838 case HCI_CHANNEL_RAW:
839 case HCI_CHANNEL_USER:
840 case HCI_CHANNEL_CONTROL:
841 /* Send event to monitor */
842 skb = create_monitor_ctrl_close(sk);
843 if (skb) {
844 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
845 HCI_SOCK_TRUSTED, NULL);
846 kfree_skb(skb);
847 }
848
849 hci_sock_free_cookie(sk);
850 break;
851 }
852
853 bt_sock_unlink(&hci_sk_list, sk);
854
855 hdev = hci_pi(sk)->hdev;
856 if (hdev) {
857 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
858 /* When releasing a user channel exclusive access,
859 * call hci_dev_do_close directly instead of calling
860 * hci_dev_close to ensure the exclusive access will
861 * be released and the controller brought back down.
862 *
863 * The checking of HCI_AUTO_OFF is not needed in this
864 * case since it will have been cleared already when
865 * opening the user channel.
866 */
867 hci_dev_do_close(hdev);
868 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
869 mgmt_index_added(hdev);
870 }
871
872 atomic_dec(&hdev->promisc);
873 hci_dev_put(hdev);
874 }
875
876 sock_orphan(sk);
877
878 skb_queue_purge(&sk->sk_receive_queue);
879 skb_queue_purge(&sk->sk_write_queue);
880
881 sock_put(sk);
882 return 0;
883}
884
885static int hci_sock_blacklist_add(struct hci_dev *hdev, void __user *arg)
886{
887 bdaddr_t bdaddr;
888 int err;
889
890 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
891 return -EFAULT;
892
893 hci_dev_lock(hdev);
894
895 err = hci_bdaddr_list_add(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
896
897 hci_dev_unlock(hdev);
898
899 return err;
900}
901
902static int hci_sock_blacklist_del(struct hci_dev *hdev, void __user *arg)
903{
904 bdaddr_t bdaddr;
905 int err;
906
907 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
908 return -EFAULT;
909
910 hci_dev_lock(hdev);
911
912 err = hci_bdaddr_list_del(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
913
914 hci_dev_unlock(hdev);
915
916 return err;
917}
918
919/* Ioctls that require bound socket */
920static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
921 unsigned long arg)
922{
923 struct hci_dev *hdev = hci_pi(sk)->hdev;
924
925 if (!hdev)
926 return -EBADFD;
927
928 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
929 return -EBUSY;
930
931 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
932 return -EOPNOTSUPP;
933
934 if (hdev->dev_type != HCI_PRIMARY)
935 return -EOPNOTSUPP;
936
937 switch (cmd) {
938 case HCISETRAW:
939 if (!capable(CAP_NET_ADMIN))
940 return -EPERM;
941 return -EOPNOTSUPP;
942
943 case HCIGETCONNINFO:
944 return hci_get_conn_info(hdev, (void __user *)arg);
945
946 case HCIGETAUTHINFO:
947 return hci_get_auth_info(hdev, (void __user *)arg);
948
949 case HCIBLOCKADDR:
950 if (!capable(CAP_NET_ADMIN))
951 return -EPERM;
952 return hci_sock_blacklist_add(hdev, (void __user *)arg);
953
954 case HCIUNBLOCKADDR:
955 if (!capable(CAP_NET_ADMIN))
956 return -EPERM;
957 return hci_sock_blacklist_del(hdev, (void __user *)arg);
958 }
959
960 return -ENOIOCTLCMD;
961}
962
963static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
964 unsigned long arg)
965{
966 void __user *argp = (void __user *)arg;
967 struct sock *sk = sock->sk;
968 int err;
969
970 BT_DBG("cmd %x arg %lx", cmd, arg);
971
972 lock_sock(sk);
973
974 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
975 err = -EBADFD;
976 goto done;
977 }
978
979 /* When calling an ioctl on an unbound raw socket, then ensure
980 * that the monitor gets informed. Ensure that the resulting event
981 * is only send once by checking if the cookie exists or not. The
982 * socket cookie will be only ever generated once for the lifetime
983 * of a given socket.
984 */
985 if (hci_sock_gen_cookie(sk)) {
986 struct sk_buff *skb;
987
988 if (capable(CAP_NET_ADMIN))
989 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
990
991 /* Send event to monitor */
992 skb = create_monitor_ctrl_open(sk);
993 if (skb) {
994 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
995 HCI_SOCK_TRUSTED, NULL);
996 kfree_skb(skb);
997 }
998 }
999
1000 release_sock(sk);
1001
1002 switch (cmd) {
1003 case HCIGETDEVLIST:
1004 return hci_get_dev_list(argp);
1005
1006 case HCIGETDEVINFO:
1007 return hci_get_dev_info(argp);
1008
1009 case HCIGETCONNLIST:
1010 return hci_get_conn_list(argp);
1011
1012 case HCIDEVUP:
1013 if (!capable(CAP_NET_ADMIN))
1014 return -EPERM;
1015 return hci_dev_open(arg);
1016
1017 case HCIDEVDOWN:
1018 if (!capable(CAP_NET_ADMIN))
1019 return -EPERM;
1020 return hci_dev_close(arg);
1021
1022 case HCIDEVRESET:
1023 if (!capable(CAP_NET_ADMIN))
1024 return -EPERM;
1025 return hci_dev_reset(arg);
1026
1027 case HCIDEVRESTAT:
1028 if (!capable(CAP_NET_ADMIN))
1029 return -EPERM;
1030 return hci_dev_reset_stat(arg);
1031
1032 case HCISETSCAN:
1033 case HCISETAUTH:
1034 case HCISETENCRYPT:
1035 case HCISETPTYPE:
1036 case HCISETLINKPOL:
1037 case HCISETLINKMODE:
1038 case HCISETACLMTU:
1039 case HCISETSCOMTU:
1040 if (!capable(CAP_NET_ADMIN))
1041 return -EPERM;
1042 return hci_dev_cmd(cmd, argp);
1043
1044 case HCIINQUIRY:
1045 return hci_inquiry(argp);
1046 }
1047
1048 lock_sock(sk);
1049
1050 err = hci_sock_bound_ioctl(sk, cmd, arg);
1051
1052done:
1053 release_sock(sk);
1054 return err;
1055}
1056
1057static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
1058 int addr_len)
1059{
1060 struct sockaddr_hci haddr;
1061 struct sock *sk = sock->sk;
1062 struct hci_dev *hdev = NULL;
1063 struct sk_buff *skb;
1064 int len, err = 0;
1065
1066 BT_DBG("sock %p sk %p", sock, sk);
1067
1068 if (!addr)
1069 return -EINVAL;
1070
1071 memset(&haddr, 0, sizeof(haddr));
1072 len = min_t(unsigned int, sizeof(haddr), addr_len);
1073 memcpy(&haddr, addr, len);
1074
1075 if (haddr.hci_family != AF_BLUETOOTH)
1076 return -EINVAL;
1077
1078 lock_sock(sk);
1079
1080 if (sk->sk_state == BT_BOUND) {
1081 err = -EALREADY;
1082 goto done;
1083 }
1084
1085 switch (haddr.hci_channel) {
1086 case HCI_CHANNEL_RAW:
1087 if (hci_pi(sk)->hdev) {
1088 err = -EALREADY;
1089 goto done;
1090 }
1091
1092 if (haddr.hci_dev != HCI_DEV_NONE) {
1093 hdev = hci_dev_get(haddr.hci_dev);
1094 if (!hdev) {
1095 err = -ENODEV;
1096 goto done;
1097 }
1098
1099 atomic_inc(&hdev->promisc);
1100 }
1101
1102 hci_pi(sk)->channel = haddr.hci_channel;
1103
1104 if (!hci_sock_gen_cookie(sk)) {
1105 /* In the case when a cookie has already been assigned,
1106 * then there has been already an ioctl issued against
1107 * an unbound socket and with that triggerd an open
1108 * notification. Send a close notification first to
1109 * allow the state transition to bounded.
1110 */
1111 skb = create_monitor_ctrl_close(sk);
1112 if (skb) {
1113 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1114 HCI_SOCK_TRUSTED, NULL);
1115 kfree_skb(skb);
1116 }
1117 }
1118
1119 if (capable(CAP_NET_ADMIN))
1120 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1121
1122 hci_pi(sk)->hdev = hdev;
1123
1124 /* Send event to monitor */
1125 skb = create_monitor_ctrl_open(sk);
1126 if (skb) {
1127 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1128 HCI_SOCK_TRUSTED, NULL);
1129 kfree_skb(skb);
1130 }
1131 break;
1132
1133 case HCI_CHANNEL_USER:
1134 if (hci_pi(sk)->hdev) {
1135 err = -EALREADY;
1136 goto done;
1137 }
1138
1139 if (haddr.hci_dev == HCI_DEV_NONE) {
1140 err = -EINVAL;
1141 goto done;
1142 }
1143
1144 if (!capable(CAP_NET_ADMIN)) {
1145 err = -EPERM;
1146 goto done;
1147 }
1148
1149 hdev = hci_dev_get(haddr.hci_dev);
1150 if (!hdev) {
1151 err = -ENODEV;
1152 goto done;
1153 }
1154
1155 if (test_bit(HCI_INIT, &hdev->flags) ||
1156 hci_dev_test_flag(hdev, HCI_SETUP) ||
1157 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1158 (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) &&
1159 test_bit(HCI_UP, &hdev->flags))) {
1160 err = -EBUSY;
1161 hci_dev_put(hdev);
1162 goto done;
1163 }
1164
1165 if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) {
1166 err = -EUSERS;
1167 hci_dev_put(hdev);
1168 goto done;
1169 }
1170
1171 mgmt_index_removed(hdev);
1172
1173 err = hci_dev_open(hdev->id);
1174 if (err) {
1175 if (err == -EALREADY) {
1176 /* In case the transport is already up and
1177 * running, clear the error here.
1178 *
1179 * This can happen when opening a user
1180 * channel and HCI_AUTO_OFF grace period
1181 * is still active.
1182 */
1183 err = 0;
1184 } else {
1185 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
1186 mgmt_index_added(hdev);
1187 hci_dev_put(hdev);
1188 goto done;
1189 }
1190 }
1191
1192 hci_pi(sk)->channel = haddr.hci_channel;
1193
1194 if (!hci_sock_gen_cookie(sk)) {
1195 /* In the case when a cookie has already been assigned,
1196 * this socket will transition from a raw socket into
1197 * a user channel socket. For a clean transition, send
1198 * the close notification first.
1199 */
1200 skb = create_monitor_ctrl_close(sk);
1201 if (skb) {
1202 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1203 HCI_SOCK_TRUSTED, NULL);
1204 kfree_skb(skb);
1205 }
1206 }
1207
1208 /* The user channel is restricted to CAP_NET_ADMIN
1209 * capabilities and with that implicitly trusted.
1210 */
1211 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1212
1213 hci_pi(sk)->hdev = hdev;
1214
1215 /* Send event to monitor */
1216 skb = create_monitor_ctrl_open(sk);
1217 if (skb) {
1218 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1219 HCI_SOCK_TRUSTED, NULL);
1220 kfree_skb(skb);
1221 }
1222
1223 atomic_inc(&hdev->promisc);
1224 break;
1225
1226 case HCI_CHANNEL_MONITOR:
1227 if (haddr.hci_dev != HCI_DEV_NONE) {
1228 err = -EINVAL;
1229 goto done;
1230 }
1231
1232 if (!capable(CAP_NET_RAW)) {
1233 err = -EPERM;
1234 goto done;
1235 }
1236
1237 hci_pi(sk)->channel = haddr.hci_channel;
1238
1239 /* The monitor interface is restricted to CAP_NET_RAW
1240 * capabilities and with that implicitly trusted.
1241 */
1242 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1243
1244 send_monitor_note(sk, "Linux version %s (%s)",
1245 init_utsname()->release,
1246 init_utsname()->machine);
1247 send_monitor_note(sk, "Bluetooth subsystem version %u.%u",
1248 BT_SUBSYS_VERSION, BT_SUBSYS_REVISION);
1249 send_monitor_replay(sk);
1250 send_monitor_control_replay(sk);
1251
1252 atomic_inc(&monitor_promisc);
1253 break;
1254
1255 case HCI_CHANNEL_LOGGING:
1256 if (haddr.hci_dev != HCI_DEV_NONE) {
1257 err = -EINVAL;
1258 goto done;
1259 }
1260
1261 if (!capable(CAP_NET_ADMIN)) {
1262 err = -EPERM;
1263 goto done;
1264 }
1265
1266 hci_pi(sk)->channel = haddr.hci_channel;
1267 break;
1268
1269 default:
1270 if (!hci_mgmt_chan_find(haddr.hci_channel)) {
1271 err = -EINVAL;
1272 goto done;
1273 }
1274
1275 if (haddr.hci_dev != HCI_DEV_NONE) {
1276 err = -EINVAL;
1277 goto done;
1278 }
1279
1280 /* Users with CAP_NET_ADMIN capabilities are allowed
1281 * access to all management commands and events. For
1282 * untrusted users the interface is restricted and
1283 * also only untrusted events are sent.
1284 */
1285 if (capable(CAP_NET_ADMIN))
1286 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1287
1288 hci_pi(sk)->channel = haddr.hci_channel;
1289
1290 /* At the moment the index and unconfigured index events
1291 * are enabled unconditionally. Setting them on each
1292 * socket when binding keeps this functionality. They
1293 * however might be cleared later and then sending of these
1294 * events will be disabled, but that is then intentional.
1295 *
1296 * This also enables generic events that are safe to be
1297 * received by untrusted users. Example for such events
1298 * are changes to settings, class of device, name etc.
1299 */
1300 if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) {
1301 if (!hci_sock_gen_cookie(sk)) {
1302 /* In the case when a cookie has already been
1303 * assigned, this socket will transtion from
1304 * a raw socket into a control socket. To
1305 * allow for a clean transtion, send the
1306 * close notification first.
1307 */
1308 skb = create_monitor_ctrl_close(sk);
1309 if (skb) {
1310 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1311 HCI_SOCK_TRUSTED, NULL);
1312 kfree_skb(skb);
1313 }
1314 }
1315
1316 /* Send event to monitor */
1317 skb = create_monitor_ctrl_open(sk);
1318 if (skb) {
1319 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1320 HCI_SOCK_TRUSTED, NULL);
1321 kfree_skb(skb);
1322 }
1323
1324 hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS);
1325 hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);
1326 hci_sock_set_flag(sk, HCI_MGMT_OPTION_EVENTS);
1327 hci_sock_set_flag(sk, HCI_MGMT_SETTING_EVENTS);
1328 hci_sock_set_flag(sk, HCI_MGMT_DEV_CLASS_EVENTS);
1329 hci_sock_set_flag(sk, HCI_MGMT_LOCAL_NAME_EVENTS);
1330 }
1331 break;
1332 }
1333
1334 sk->sk_state = BT_BOUND;
1335
1336done:
1337 release_sock(sk);
1338 return err;
1339}
1340
1341static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
1342 int peer)
1343{
1344 struct sockaddr_hci *haddr = (struct sockaddr_hci *)addr;
1345 struct sock *sk = sock->sk;
1346 struct hci_dev *hdev;
1347 int err = 0;
1348
1349 BT_DBG("sock %p sk %p", sock, sk);
1350
1351 if (peer)
1352 return -EOPNOTSUPP;
1353
1354 lock_sock(sk);
1355
1356 hdev = hci_pi(sk)->hdev;
1357 if (!hdev) {
1358 err = -EBADFD;
1359 goto done;
1360 }
1361
1362 haddr->hci_family = AF_BLUETOOTH;
1363 haddr->hci_dev = hdev->id;
1364 haddr->hci_channel= hci_pi(sk)->channel;
1365 err = sizeof(*haddr);
1366
1367done:
1368 release_sock(sk);
1369 return err;
1370}
1371
1372static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
1373 struct sk_buff *skb)
1374{
1375 __u32 mask = hci_pi(sk)->cmsg_mask;
1376
1377 if (mask & HCI_CMSG_DIR) {
1378 int incoming = bt_cb(skb)->incoming;
1379 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
1380 &incoming);
1381 }
1382
1383 if (mask & HCI_CMSG_TSTAMP) {
1384#ifdef CONFIG_COMPAT
1385 struct old_timeval32 ctv;
1386#endif
1387 struct __kernel_old_timeval tv;
1388 void *data;
1389 int len;
1390
1391 skb_get_timestamp(skb, &tv);
1392
1393 data = &tv;
1394 len = sizeof(tv);
1395#ifdef CONFIG_COMPAT
1396 if (!COMPAT_USE_64BIT_TIME &&
1397 (msg->msg_flags & MSG_CMSG_COMPAT)) {
1398 ctv.tv_sec = tv.tv_sec;
1399 ctv.tv_usec = tv.tv_usec;
1400 data = &ctv;
1401 len = sizeof(ctv);
1402 }
1403#endif
1404
1405 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
1406 }
1407}
1408
1409static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1410 size_t len, int flags)
1411{
1412 int noblock = flags & MSG_DONTWAIT;
1413 struct sock *sk = sock->sk;
1414 struct sk_buff *skb;
1415 int copied, err;
1416 unsigned int skblen;
1417
1418 BT_DBG("sock %p, sk %p", sock, sk);
1419
1420 if (flags & MSG_OOB)
1421 return -EOPNOTSUPP;
1422
1423 if (hci_pi(sk)->channel == HCI_CHANNEL_LOGGING)
1424 return -EOPNOTSUPP;
1425
1426 if (sk->sk_state == BT_CLOSED)
1427 return 0;
1428
1429 skb = skb_recv_datagram(sk, flags, noblock, &err);
1430 if (!skb)
1431 return err;
1432
1433 skblen = skb->len;
1434 copied = skb->len;
1435 if (len < copied) {
1436 msg->msg_flags |= MSG_TRUNC;
1437 copied = len;
1438 }
1439
1440 skb_reset_transport_header(skb);
1441 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1442
1443 switch (hci_pi(sk)->channel) {
1444 case HCI_CHANNEL_RAW:
1445 hci_sock_cmsg(sk, msg, skb);
1446 break;
1447 case HCI_CHANNEL_USER:
1448 case HCI_CHANNEL_MONITOR:
1449 sock_recv_timestamp(msg, sk, skb);
1450 break;
1451 default:
1452 if (hci_mgmt_chan_find(hci_pi(sk)->channel))
1453 sock_recv_timestamp(msg, sk, skb);
1454 break;
1455 }
1456
1457 skb_free_datagram(sk, skb);
1458
1459 if (flags & MSG_TRUNC)
1460 copied = skblen;
1461
1462 return err ? : copied;
1463}
1464
1465static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
1466 struct msghdr *msg, size_t msglen)
1467{
1468 void *buf;
1469 u8 *cp;
1470 struct mgmt_hdr *hdr;
1471 u16 opcode, index, len;
1472 struct hci_dev *hdev = NULL;
1473 const struct hci_mgmt_handler *handler;
1474 bool var_len, no_hdev;
1475 int err;
1476
1477 BT_DBG("got %zu bytes", msglen);
1478
1479 if (msglen < sizeof(*hdr))
1480 return -EINVAL;
1481
1482 buf = kmalloc(msglen, GFP_KERNEL);
1483 if (!buf)
1484 return -ENOMEM;
1485
1486 if (memcpy_from_msg(buf, msg, msglen)) {
1487 err = -EFAULT;
1488 goto done;
1489 }
1490
1491 hdr = buf;
1492 opcode = __le16_to_cpu(hdr->opcode);
1493 index = __le16_to_cpu(hdr->index);
1494 len = __le16_to_cpu(hdr->len);
1495
1496 if (len != msglen - sizeof(*hdr)) {
1497 err = -EINVAL;
1498 goto done;
1499 }
1500
1501 if (chan->channel == HCI_CHANNEL_CONTROL) {
1502 struct sk_buff *skb;
1503
1504 /* Send event to monitor */
1505 skb = create_monitor_ctrl_command(sk, index, opcode, len,
1506 buf + sizeof(*hdr));
1507 if (skb) {
1508 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1509 HCI_SOCK_TRUSTED, NULL);
1510 kfree_skb(skb);
1511 }
1512 }
1513
1514 if (opcode >= chan->handler_count ||
1515 chan->handlers[opcode].func == NULL) {
1516 BT_DBG("Unknown op %u", opcode);
1517 err = mgmt_cmd_status(sk, index, opcode,
1518 MGMT_STATUS_UNKNOWN_COMMAND);
1519 goto done;
1520 }
1521
1522 handler = &chan->handlers[opcode];
1523
1524 if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
1525 !(handler->flags & HCI_MGMT_UNTRUSTED)) {
1526 err = mgmt_cmd_status(sk, index, opcode,
1527 MGMT_STATUS_PERMISSION_DENIED);
1528 goto done;
1529 }
1530
1531 if (index != MGMT_INDEX_NONE) {
1532 hdev = hci_dev_get(index);
1533 if (!hdev) {
1534 err = mgmt_cmd_status(sk, index, opcode,
1535 MGMT_STATUS_INVALID_INDEX);
1536 goto done;
1537 }
1538
1539 if (hci_dev_test_flag(hdev, HCI_SETUP) ||
1540 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1541 hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1542 err = mgmt_cmd_status(sk, index, opcode,
1543 MGMT_STATUS_INVALID_INDEX);
1544 goto done;
1545 }
1546
1547 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1548 !(handler->flags & HCI_MGMT_UNCONFIGURED)) {
1549 err = mgmt_cmd_status(sk, index, opcode,
1550 MGMT_STATUS_INVALID_INDEX);
1551 goto done;
1552 }
1553 }
1554
1555 no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
1556 if (no_hdev != !hdev) {
1557 err = mgmt_cmd_status(sk, index, opcode,
1558 MGMT_STATUS_INVALID_INDEX);
1559 goto done;
1560 }
1561
1562 var_len = (handler->flags & HCI_MGMT_VAR_LEN);
1563 if ((var_len && len < handler->data_len) ||
1564 (!var_len && len != handler->data_len)) {
1565 err = mgmt_cmd_status(sk, index, opcode,
1566 MGMT_STATUS_INVALID_PARAMS);
1567 goto done;
1568 }
1569
1570 if (hdev && chan->hdev_init)
1571 chan->hdev_init(sk, hdev);
1572
1573 cp = buf + sizeof(*hdr);
1574
1575 err = handler->func(sk, hdev, cp, len);
1576 if (err < 0)
1577 goto done;
1578
1579 err = msglen;
1580
1581done:
1582 if (hdev)
1583 hci_dev_put(hdev);
1584
1585 kfree(buf);
1586 return err;
1587}
1588
1589static int hci_logging_frame(struct sock *sk, struct msghdr *msg, int len)
1590{
1591 struct hci_mon_hdr *hdr;
1592 struct sk_buff *skb;
1593 struct hci_dev *hdev;
1594 u16 index;
1595 int err;
1596
1597 /* The logging frame consists at minimum of the standard header,
1598 * the priority byte, the ident length byte and at least one string
1599 * terminator NUL byte. Anything shorter are invalid packets.
1600 */
1601 if (len < sizeof(*hdr) + 3)
1602 return -EINVAL;
1603
1604 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1605 if (!skb)
1606 return err;
1607
1608 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1609 err = -EFAULT;
1610 goto drop;
1611 }
1612
1613 hdr = (void *)skb->data;
1614
1615 if (__le16_to_cpu(hdr->len) != len - sizeof(*hdr)) {
1616 err = -EINVAL;
1617 goto drop;
1618 }
1619
1620 if (__le16_to_cpu(hdr->opcode) == 0x0000) {
1621 __u8 priority = skb->data[sizeof(*hdr)];
1622 __u8 ident_len = skb->data[sizeof(*hdr) + 1];
1623
1624 /* Only the priorities 0-7 are valid and with that any other
1625 * value results in an invalid packet.
1626 *
1627 * The priority byte is followed by an ident length byte and
1628 * the NUL terminated ident string. Check that the ident
1629 * length is not overflowing the packet and also that the
1630 * ident string itself is NUL terminated. In case the ident
1631 * length is zero, the length value actually doubles as NUL
1632 * terminator identifier.
1633 *
1634 * The message follows the ident string (if present) and
1635 * must be NUL terminated. Otherwise it is not a valid packet.
1636 */
1637 if (priority > 7 || skb->data[len - 1] != 0x00 ||
1638 ident_len > len - sizeof(*hdr) - 3 ||
1639 skb->data[sizeof(*hdr) + ident_len + 1] != 0x00) {
1640 err = -EINVAL;
1641 goto drop;
1642 }
1643 } else {
1644 err = -EINVAL;
1645 goto drop;
1646 }
1647
1648 index = __le16_to_cpu(hdr->index);
1649
1650 if (index != MGMT_INDEX_NONE) {
1651 hdev = hci_dev_get(index);
1652 if (!hdev) {
1653 err = -ENODEV;
1654 goto drop;
1655 }
1656 } else {
1657 hdev = NULL;
1658 }
1659
1660 hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING);
1661
1662 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL);
1663 err = len;
1664
1665 if (hdev)
1666 hci_dev_put(hdev);
1667
1668drop:
1669 kfree_skb(skb);
1670 return err;
1671}
1672
1673static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1674 size_t len)
1675{
1676 struct sock *sk = sock->sk;
1677 struct hci_mgmt_chan *chan;
1678 struct hci_dev *hdev;
1679 struct sk_buff *skb;
1680 int err;
1681
1682 BT_DBG("sock %p sk %p", sock, sk);
1683
1684 if (msg->msg_flags & MSG_OOB)
1685 return -EOPNOTSUPP;
1686
1687 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE|
1688 MSG_CMSG_COMPAT))
1689 return -EINVAL;
1690
1691 if (len < 4 || len > HCI_MAX_FRAME_SIZE)
1692 return -EINVAL;
1693
1694 lock_sock(sk);
1695
1696 switch (hci_pi(sk)->channel) {
1697 case HCI_CHANNEL_RAW:
1698 case HCI_CHANNEL_USER:
1699 break;
1700 case HCI_CHANNEL_MONITOR:
1701 err = -EOPNOTSUPP;
1702 goto done;
1703 case HCI_CHANNEL_LOGGING:
1704 err = hci_logging_frame(sk, msg, len);
1705 goto done;
1706 default:
1707 mutex_lock(&mgmt_chan_list_lock);
1708 chan = __hci_mgmt_chan_find(hci_pi(sk)->channel);
1709 if (chan)
1710 err = hci_mgmt_cmd(chan, sk, msg, len);
1711 else
1712 err = -EINVAL;
1713
1714 mutex_unlock(&mgmt_chan_list_lock);
1715 goto done;
1716 }
1717
1718 hdev = hci_pi(sk)->hdev;
1719 if (!hdev) {
1720 err = -EBADFD;
1721 goto done;
1722 }
1723
1724 if (!test_bit(HCI_UP, &hdev->flags)) {
1725 err = -ENETDOWN;
1726 goto done;
1727 }
1728
1729 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1730 if (!skb)
1731 goto done;
1732
1733 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1734 err = -EFAULT;
1735 goto drop;
1736 }
1737
1738 hci_skb_pkt_type(skb) = skb->data[0];
1739 skb_pull(skb, 1);
1740
1741 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
1742 /* No permission check is needed for user channel
1743 * since that gets enforced when binding the socket.
1744 *
1745 * However check that the packet type is valid.
1746 */
1747 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
1748 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1749 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT) {
1750 err = -EINVAL;
1751 goto drop;
1752 }
1753
1754 skb_queue_tail(&hdev->raw_q, skb);
1755 queue_work(hdev->workqueue, &hdev->tx_work);
1756 } else if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
1757 u16 opcode = get_unaligned_le16(skb->data);
1758 u16 ogf = hci_opcode_ogf(opcode);
1759 u16 ocf = hci_opcode_ocf(opcode);
1760
1761 if (((ogf > HCI_SFLT_MAX_OGF) ||
1762 !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
1763 &hci_sec_filter.ocf_mask[ogf])) &&
1764 !capable(CAP_NET_RAW)) {
1765 err = -EPERM;
1766 goto drop;
1767 }
1768
1769 /* Since the opcode has already been extracted here, store
1770 * a copy of the value for later use by the drivers.
1771 */
1772 hci_skb_opcode(skb) = opcode;
1773
1774 if (ogf == 0x3f) {
1775 skb_queue_tail(&hdev->raw_q, skb);
1776 queue_work(hdev->workqueue, &hdev->tx_work);
1777 } else {
1778 /* Stand-alone HCI commands must be flagged as
1779 * single-command requests.
1780 */
1781 bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
1782
1783 skb_queue_tail(&hdev->cmd_q, skb);
1784 queue_work(hdev->workqueue, &hdev->cmd_work);
1785 }
1786 } else {
1787 if (!capable(CAP_NET_RAW)) {
1788 err = -EPERM;
1789 goto drop;
1790 }
1791
1792 if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1793 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT) {
1794 err = -EINVAL;
1795 goto drop;
1796 }
1797
1798 skb_queue_tail(&hdev->raw_q, skb);
1799 queue_work(hdev->workqueue, &hdev->tx_work);
1800 }
1801
1802 err = len;
1803
1804done:
1805 release_sock(sk);
1806 return err;
1807
1808drop:
1809 kfree_skb(skb);
1810 goto done;
1811}
1812
1813static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1814 char __user *optval, unsigned int len)
1815{
1816 struct hci_ufilter uf = { .opcode = 0 };
1817 struct sock *sk = sock->sk;
1818 int err = 0, opt = 0;
1819
1820 BT_DBG("sk %p, opt %d", sk, optname);
1821
1822 if (level != SOL_HCI)
1823 return -ENOPROTOOPT;
1824
1825 lock_sock(sk);
1826
1827 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1828 err = -EBADFD;
1829 goto done;
1830 }
1831
1832 switch (optname) {
1833 case HCI_DATA_DIR:
1834 if (get_user(opt, (int __user *)optval)) {
1835 err = -EFAULT;
1836 break;
1837 }
1838
1839 if (opt)
1840 hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1841 else
1842 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1843 break;
1844
1845 case HCI_TIME_STAMP:
1846 if (get_user(opt, (int __user *)optval)) {
1847 err = -EFAULT;
1848 break;
1849 }
1850
1851 if (opt)
1852 hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1853 else
1854 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1855 break;
1856
1857 case HCI_FILTER:
1858 {
1859 struct hci_filter *f = &hci_pi(sk)->filter;
1860
1861 uf.type_mask = f->type_mask;
1862 uf.opcode = f->opcode;
1863 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1864 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1865 }
1866
1867 len = min_t(unsigned int, len, sizeof(uf));
1868 if (copy_from_user(&uf, optval, len)) {
1869 err = -EFAULT;
1870 break;
1871 }
1872
1873 if (!capable(CAP_NET_RAW)) {
1874 uf.type_mask &= hci_sec_filter.type_mask;
1875 uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1876 uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1877 }
1878
1879 {
1880 struct hci_filter *f = &hci_pi(sk)->filter;
1881
1882 f->type_mask = uf.type_mask;
1883 f->opcode = uf.opcode;
1884 *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1885 *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1886 }
1887 break;
1888
1889 default:
1890 err = -ENOPROTOOPT;
1891 break;
1892 }
1893
1894done:
1895 release_sock(sk);
1896 return err;
1897}
1898
1899static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
1900 char __user *optval, int __user *optlen)
1901{
1902 struct hci_ufilter uf;
1903 struct sock *sk = sock->sk;
1904 int len, opt, err = 0;
1905
1906 BT_DBG("sk %p, opt %d", sk, optname);
1907
1908 if (level != SOL_HCI)
1909 return -ENOPROTOOPT;
1910
1911 if (get_user(len, optlen))
1912 return -EFAULT;
1913
1914 lock_sock(sk);
1915
1916 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1917 err = -EBADFD;
1918 goto done;
1919 }
1920
1921 switch (optname) {
1922 case HCI_DATA_DIR:
1923 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1924 opt = 1;
1925 else
1926 opt = 0;
1927
1928 if (put_user(opt, optval))
1929 err = -EFAULT;
1930 break;
1931
1932 case HCI_TIME_STAMP:
1933 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1934 opt = 1;
1935 else
1936 opt = 0;
1937
1938 if (put_user(opt, optval))
1939 err = -EFAULT;
1940 break;
1941
1942 case HCI_FILTER:
1943 {
1944 struct hci_filter *f = &hci_pi(sk)->filter;
1945
1946 memset(&uf, 0, sizeof(uf));
1947 uf.type_mask = f->type_mask;
1948 uf.opcode = f->opcode;
1949 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1950 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1951 }
1952
1953 len = min_t(unsigned int, len, sizeof(uf));
1954 if (copy_to_user(optval, &uf, len))
1955 err = -EFAULT;
1956 break;
1957
1958 default:
1959 err = -ENOPROTOOPT;
1960 break;
1961 }
1962
1963done:
1964 release_sock(sk);
1965 return err;
1966}
1967
1968static const struct proto_ops hci_sock_ops = {
1969 .family = PF_BLUETOOTH,
1970 .owner = THIS_MODULE,
1971 .release = hci_sock_release,
1972 .bind = hci_sock_bind,
1973 .getname = hci_sock_getname,
1974 .sendmsg = hci_sock_sendmsg,
1975 .recvmsg = hci_sock_recvmsg,
1976 .ioctl = hci_sock_ioctl,
1977 .poll = datagram_poll,
1978 .listen = sock_no_listen,
1979 .shutdown = sock_no_shutdown,
1980 .setsockopt = hci_sock_setsockopt,
1981 .getsockopt = hci_sock_getsockopt,
1982 .connect = sock_no_connect,
1983 .socketpair = sock_no_socketpair,
1984 .accept = sock_no_accept,
1985 .mmap = sock_no_mmap
1986};
1987
1988static struct proto hci_sk_proto = {
1989 .name = "HCI",
1990 .owner = THIS_MODULE,
1991 .obj_size = sizeof(struct hci_pinfo)
1992};
1993
1994static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
1995 int kern)
1996{
1997 struct sock *sk;
1998
1999 BT_DBG("sock %p", sock);
2000
2001 if (sock->type != SOCK_RAW)
2002 return -ESOCKTNOSUPPORT;
2003
2004 sock->ops = &hci_sock_ops;
2005
2006 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, kern);
2007 if (!sk)
2008 return -ENOMEM;
2009
2010 sock_init_data(sock, sk);
2011
2012 sock_reset_flag(sk, SOCK_ZAPPED);
2013
2014 sk->sk_protocol = protocol;
2015
2016 sock->state = SS_UNCONNECTED;
2017 sk->sk_state = BT_OPEN;
2018
2019 bt_sock_link(&hci_sk_list, sk);
2020 return 0;
2021}
2022
2023static const struct net_proto_family hci_sock_family_ops = {
2024 .family = PF_BLUETOOTH,
2025 .owner = THIS_MODULE,
2026 .create = hci_sock_create,
2027};
2028
2029int __init hci_sock_init(void)
2030{
2031 int err;
2032
2033 BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr));
2034
2035 err = proto_register(&hci_sk_proto, 0);
2036 if (err < 0)
2037 return err;
2038
2039 err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
2040 if (err < 0) {
2041 BT_ERR("HCI socket registration failed");
2042 goto error;
2043 }
2044
2045 err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
2046 if (err < 0) {
2047 BT_ERR("Failed to create HCI proc file");
2048 bt_sock_unregister(BTPROTO_HCI);
2049 goto error;
2050 }
2051
2052 BT_INFO("HCI socket layer initialized");
2053
2054 return 0;
2055
2056error:
2057 proto_unregister(&hci_sk_proto);
2058 return err;
2059}
2060
2061void hci_sock_cleanup(void)
2062{
2063 bt_procfs_cleanup(&init_net, "hci");
2064 bt_sock_unregister(BTPROTO_HCI);
2065 proto_unregister(&hci_sk_proto);
2066}
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#include <linux/compat.h>
27#include <linux/export.h>
28#include <linux/utsname.h>
29#include <linux/sched.h>
30#include <asm/unaligned.h>
31
32#include <net/bluetooth/bluetooth.h>
33#include <net/bluetooth/hci_core.h>
34#include <net/bluetooth/hci_mon.h>
35#include <net/bluetooth/mgmt.h>
36
37#include "mgmt_util.h"
38
39static LIST_HEAD(mgmt_chan_list);
40static DEFINE_MUTEX(mgmt_chan_list_lock);
41
42static DEFINE_IDA(sock_cookie_ida);
43
44static atomic_t monitor_promisc = ATOMIC_INIT(0);
45
46/* ----- HCI socket interface ----- */
47
48/* Socket info */
49#define hci_pi(sk) ((struct hci_pinfo *) sk)
50
51struct hci_pinfo {
52 struct bt_sock bt;
53 struct hci_dev *hdev;
54 struct hci_filter filter;
55 __u8 cmsg_mask;
56 unsigned short channel;
57 unsigned long flags;
58 __u32 cookie;
59 char comm[TASK_COMM_LEN];
60};
61
62static struct hci_dev *hci_hdev_from_sock(struct sock *sk)
63{
64 struct hci_dev *hdev = hci_pi(sk)->hdev;
65
66 if (!hdev)
67 return ERR_PTR(-EBADFD);
68 if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
69 return ERR_PTR(-EPIPE);
70 return hdev;
71}
72
73void hci_sock_set_flag(struct sock *sk, int nr)
74{
75 set_bit(nr, &hci_pi(sk)->flags);
76}
77
78void hci_sock_clear_flag(struct sock *sk, int nr)
79{
80 clear_bit(nr, &hci_pi(sk)->flags);
81}
82
83int hci_sock_test_flag(struct sock *sk, int nr)
84{
85 return test_bit(nr, &hci_pi(sk)->flags);
86}
87
88unsigned short hci_sock_get_channel(struct sock *sk)
89{
90 return hci_pi(sk)->channel;
91}
92
93u32 hci_sock_get_cookie(struct sock *sk)
94{
95 return hci_pi(sk)->cookie;
96}
97
98static bool hci_sock_gen_cookie(struct sock *sk)
99{
100 int id = hci_pi(sk)->cookie;
101
102 if (!id) {
103 id = ida_simple_get(&sock_cookie_ida, 1, 0, GFP_KERNEL);
104 if (id < 0)
105 id = 0xffffffff;
106
107 hci_pi(sk)->cookie = id;
108 get_task_comm(hci_pi(sk)->comm, current);
109 return true;
110 }
111
112 return false;
113}
114
115static void hci_sock_free_cookie(struct sock *sk)
116{
117 int id = hci_pi(sk)->cookie;
118
119 if (id) {
120 hci_pi(sk)->cookie = 0xffffffff;
121 ida_simple_remove(&sock_cookie_ida, id);
122 }
123}
124
125static inline int hci_test_bit(int nr, const void *addr)
126{
127 return *((const __u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
128}
129
130/* Security filter */
131#define HCI_SFLT_MAX_OGF 5
132
133struct hci_sec_filter {
134 __u32 type_mask;
135 __u32 event_mask[2];
136 __u32 ocf_mask[HCI_SFLT_MAX_OGF + 1][4];
137};
138
139static const struct hci_sec_filter hci_sec_filter = {
140 /* Packet types */
141 0x10,
142 /* Events */
143 { 0x1000d9fe, 0x0000b00c },
144 /* Commands */
145 {
146 { 0x0 },
147 /* OGF_LINK_CTL */
148 { 0xbe000006, 0x00000001, 0x00000000, 0x00 },
149 /* OGF_LINK_POLICY */
150 { 0x00005200, 0x00000000, 0x00000000, 0x00 },
151 /* OGF_HOST_CTL */
152 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
153 /* OGF_INFO_PARAM */
154 { 0x000002be, 0x00000000, 0x00000000, 0x00 },
155 /* OGF_STATUS_PARAM */
156 { 0x000000ea, 0x00000000, 0x00000000, 0x00 }
157 }
158};
159
160static struct bt_sock_list hci_sk_list = {
161 .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
162};
163
164static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb)
165{
166 struct hci_filter *flt;
167 int flt_type, flt_event;
168
169 /* Apply filter */
170 flt = &hci_pi(sk)->filter;
171
172 flt_type = hci_skb_pkt_type(skb) & HCI_FLT_TYPE_BITS;
173
174 if (!test_bit(flt_type, &flt->type_mask))
175 return true;
176
177 /* Extra filter for event packets only */
178 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT)
179 return false;
180
181 flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
182
183 if (!hci_test_bit(flt_event, &flt->event_mask))
184 return true;
185
186 /* Check filter only when opcode is set */
187 if (!flt->opcode)
188 return false;
189
190 if (flt_event == HCI_EV_CMD_COMPLETE &&
191 flt->opcode != get_unaligned((__le16 *)(skb->data + 3)))
192 return true;
193
194 if (flt_event == HCI_EV_CMD_STATUS &&
195 flt->opcode != get_unaligned((__le16 *)(skb->data + 4)))
196 return true;
197
198 return false;
199}
200
201/* Send frame to RAW socket */
202void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
203{
204 struct sock *sk;
205 struct sk_buff *skb_copy = NULL;
206
207 BT_DBG("hdev %p len %d", hdev, skb->len);
208
209 read_lock(&hci_sk_list.lock);
210
211 sk_for_each(sk, &hci_sk_list.head) {
212 struct sk_buff *nskb;
213
214 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
215 continue;
216
217 /* Don't send frame to the socket it came from */
218 if (skb->sk == sk)
219 continue;
220
221 if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
222 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
223 hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
224 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
225 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
226 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT)
227 continue;
228 if (is_filtered_packet(sk, skb))
229 continue;
230 } else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
231 if (!bt_cb(skb)->incoming)
232 continue;
233 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
234 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
235 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
236 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT)
237 continue;
238 } else {
239 /* Don't send frame to other channel types */
240 continue;
241 }
242
243 if (!skb_copy) {
244 /* Create a private copy with headroom */
245 skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
246 if (!skb_copy)
247 continue;
248
249 /* Put type byte before the data */
250 memcpy(skb_push(skb_copy, 1), &hci_skb_pkt_type(skb), 1);
251 }
252
253 nskb = skb_clone(skb_copy, GFP_ATOMIC);
254 if (!nskb)
255 continue;
256
257 if (sock_queue_rcv_skb(sk, nskb))
258 kfree_skb(nskb);
259 }
260
261 read_unlock(&hci_sk_list.lock);
262
263 kfree_skb(skb_copy);
264}
265
266/* Send frame to sockets with specific channel */
267static void __hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
268 int flag, struct sock *skip_sk)
269{
270 struct sock *sk;
271
272 BT_DBG("channel %u len %d", channel, skb->len);
273
274 sk_for_each(sk, &hci_sk_list.head) {
275 struct sk_buff *nskb;
276
277 /* Ignore socket without the flag set */
278 if (!hci_sock_test_flag(sk, flag))
279 continue;
280
281 /* Skip the original socket */
282 if (sk == skip_sk)
283 continue;
284
285 if (sk->sk_state != BT_BOUND)
286 continue;
287
288 if (hci_pi(sk)->channel != channel)
289 continue;
290
291 nskb = skb_clone(skb, GFP_ATOMIC);
292 if (!nskb)
293 continue;
294
295 if (sock_queue_rcv_skb(sk, nskb))
296 kfree_skb(nskb);
297 }
298
299}
300
301void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
302 int flag, struct sock *skip_sk)
303{
304 read_lock(&hci_sk_list.lock);
305 __hci_send_to_channel(channel, skb, flag, skip_sk);
306 read_unlock(&hci_sk_list.lock);
307}
308
309/* Send frame to monitor socket */
310void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
311{
312 struct sk_buff *skb_copy = NULL;
313 struct hci_mon_hdr *hdr;
314 __le16 opcode;
315
316 if (!atomic_read(&monitor_promisc))
317 return;
318
319 BT_DBG("hdev %p len %d", hdev, skb->len);
320
321 switch (hci_skb_pkt_type(skb)) {
322 case HCI_COMMAND_PKT:
323 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
324 break;
325 case HCI_EVENT_PKT:
326 opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
327 break;
328 case HCI_ACLDATA_PKT:
329 if (bt_cb(skb)->incoming)
330 opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
331 else
332 opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
333 break;
334 case HCI_SCODATA_PKT:
335 if (bt_cb(skb)->incoming)
336 opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
337 else
338 opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
339 break;
340 case HCI_ISODATA_PKT:
341 if (bt_cb(skb)->incoming)
342 opcode = cpu_to_le16(HCI_MON_ISO_RX_PKT);
343 else
344 opcode = cpu_to_le16(HCI_MON_ISO_TX_PKT);
345 break;
346 case HCI_DIAG_PKT:
347 opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG);
348 break;
349 default:
350 return;
351 }
352
353 /* Create a private copy with headroom */
354 skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE, GFP_ATOMIC, true);
355 if (!skb_copy)
356 return;
357
358 /* Put header before the data */
359 hdr = skb_push(skb_copy, HCI_MON_HDR_SIZE);
360 hdr->opcode = opcode;
361 hdr->index = cpu_to_le16(hdev->id);
362 hdr->len = cpu_to_le16(skb->len);
363
364 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
365 HCI_SOCK_TRUSTED, NULL);
366 kfree_skb(skb_copy);
367}
368
369void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
370 void *data, u16 data_len, ktime_t tstamp,
371 int flag, struct sock *skip_sk)
372{
373 struct sock *sk;
374 __le16 index;
375
376 if (hdev)
377 index = cpu_to_le16(hdev->id);
378 else
379 index = cpu_to_le16(MGMT_INDEX_NONE);
380
381 read_lock(&hci_sk_list.lock);
382
383 sk_for_each(sk, &hci_sk_list.head) {
384 struct hci_mon_hdr *hdr;
385 struct sk_buff *skb;
386
387 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
388 continue;
389
390 /* Ignore socket without the flag set */
391 if (!hci_sock_test_flag(sk, flag))
392 continue;
393
394 /* Skip the original socket */
395 if (sk == skip_sk)
396 continue;
397
398 skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC);
399 if (!skb)
400 continue;
401
402 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
403 put_unaligned_le16(event, skb_put(skb, 2));
404
405 if (data)
406 skb_put_data(skb, data, data_len);
407
408 skb->tstamp = tstamp;
409
410 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
411 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
412 hdr->index = index;
413 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
414
415 __hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
416 HCI_SOCK_TRUSTED, NULL);
417 kfree_skb(skb);
418 }
419
420 read_unlock(&hci_sk_list.lock);
421}
422
423static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
424{
425 struct hci_mon_hdr *hdr;
426 struct hci_mon_new_index *ni;
427 struct hci_mon_index_info *ii;
428 struct sk_buff *skb;
429 __le16 opcode;
430
431 switch (event) {
432 case HCI_DEV_REG:
433 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
434 if (!skb)
435 return NULL;
436
437 ni = skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
438 ni->type = hdev->dev_type;
439 ni->bus = hdev->bus;
440 bacpy(&ni->bdaddr, &hdev->bdaddr);
441 memcpy(ni->name, hdev->name, 8);
442
443 opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
444 break;
445
446 case HCI_DEV_UNREG:
447 skb = bt_skb_alloc(0, GFP_ATOMIC);
448 if (!skb)
449 return NULL;
450
451 opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
452 break;
453
454 case HCI_DEV_SETUP:
455 if (hdev->manufacturer == 0xffff)
456 return NULL;
457 fallthrough;
458
459 case HCI_DEV_UP:
460 skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
461 if (!skb)
462 return NULL;
463
464 ii = skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
465 bacpy(&ii->bdaddr, &hdev->bdaddr);
466 ii->manufacturer = cpu_to_le16(hdev->manufacturer);
467
468 opcode = cpu_to_le16(HCI_MON_INDEX_INFO);
469 break;
470
471 case HCI_DEV_OPEN:
472 skb = bt_skb_alloc(0, GFP_ATOMIC);
473 if (!skb)
474 return NULL;
475
476 opcode = cpu_to_le16(HCI_MON_OPEN_INDEX);
477 break;
478
479 case HCI_DEV_CLOSE:
480 skb = bt_skb_alloc(0, GFP_ATOMIC);
481 if (!skb)
482 return NULL;
483
484 opcode = cpu_to_le16(HCI_MON_CLOSE_INDEX);
485 break;
486
487 default:
488 return NULL;
489 }
490
491 __net_timestamp(skb);
492
493 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
494 hdr->opcode = opcode;
495 hdr->index = cpu_to_le16(hdev->id);
496 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
497
498 return skb;
499}
500
501static struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
502{
503 struct hci_mon_hdr *hdr;
504 struct sk_buff *skb;
505 u16 format;
506 u8 ver[3];
507 u32 flags;
508
509 /* No message needed when cookie is not present */
510 if (!hci_pi(sk)->cookie)
511 return NULL;
512
513 switch (hci_pi(sk)->channel) {
514 case HCI_CHANNEL_RAW:
515 format = 0x0000;
516 ver[0] = BT_SUBSYS_VERSION;
517 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
518 break;
519 case HCI_CHANNEL_USER:
520 format = 0x0001;
521 ver[0] = BT_SUBSYS_VERSION;
522 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
523 break;
524 case HCI_CHANNEL_CONTROL:
525 format = 0x0002;
526 mgmt_fill_version_info(ver);
527 break;
528 default:
529 /* No message for unsupported format */
530 return NULL;
531 }
532
533 skb = bt_skb_alloc(14 + TASK_COMM_LEN , GFP_ATOMIC);
534 if (!skb)
535 return NULL;
536
537 flags = hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) ? 0x1 : 0x0;
538
539 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
540 put_unaligned_le16(format, skb_put(skb, 2));
541 skb_put_data(skb, ver, sizeof(ver));
542 put_unaligned_le32(flags, skb_put(skb, 4));
543 skb_put_u8(skb, TASK_COMM_LEN);
544 skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN);
545
546 __net_timestamp(skb);
547
548 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
549 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_OPEN);
550 if (hci_pi(sk)->hdev)
551 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
552 else
553 hdr->index = cpu_to_le16(HCI_DEV_NONE);
554 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
555
556 return skb;
557}
558
559static struct sk_buff *create_monitor_ctrl_close(struct sock *sk)
560{
561 struct hci_mon_hdr *hdr;
562 struct sk_buff *skb;
563
564 /* No message needed when cookie is not present */
565 if (!hci_pi(sk)->cookie)
566 return NULL;
567
568 switch (hci_pi(sk)->channel) {
569 case HCI_CHANNEL_RAW:
570 case HCI_CHANNEL_USER:
571 case HCI_CHANNEL_CONTROL:
572 break;
573 default:
574 /* No message for unsupported format */
575 return NULL;
576 }
577
578 skb = bt_skb_alloc(4, GFP_ATOMIC);
579 if (!skb)
580 return NULL;
581
582 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
583
584 __net_timestamp(skb);
585
586 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
587 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_CLOSE);
588 if (hci_pi(sk)->hdev)
589 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
590 else
591 hdr->index = cpu_to_le16(HCI_DEV_NONE);
592 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
593
594 return skb;
595}
596
597static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index,
598 u16 opcode, u16 len,
599 const void *buf)
600{
601 struct hci_mon_hdr *hdr;
602 struct sk_buff *skb;
603
604 skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
605 if (!skb)
606 return NULL;
607
608 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
609 put_unaligned_le16(opcode, skb_put(skb, 2));
610
611 if (buf)
612 skb_put_data(skb, buf, len);
613
614 __net_timestamp(skb);
615
616 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
617 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND);
618 hdr->index = cpu_to_le16(index);
619 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
620
621 return skb;
622}
623
624static void __printf(2, 3)
625send_monitor_note(struct sock *sk, const char *fmt, ...)
626{
627 size_t len;
628 struct hci_mon_hdr *hdr;
629 struct sk_buff *skb;
630 va_list args;
631
632 va_start(args, fmt);
633 len = vsnprintf(NULL, 0, fmt, args);
634 va_end(args);
635
636 skb = bt_skb_alloc(len + 1, GFP_ATOMIC);
637 if (!skb)
638 return;
639
640 va_start(args, fmt);
641 vsprintf(skb_put(skb, len), fmt, args);
642 *(u8 *)skb_put(skb, 1) = 0;
643 va_end(args);
644
645 __net_timestamp(skb);
646
647 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
648 hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE);
649 hdr->index = cpu_to_le16(HCI_DEV_NONE);
650 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
651
652 if (sock_queue_rcv_skb(sk, skb))
653 kfree_skb(skb);
654}
655
656static void send_monitor_replay(struct sock *sk)
657{
658 struct hci_dev *hdev;
659
660 read_lock(&hci_dev_list_lock);
661
662 list_for_each_entry(hdev, &hci_dev_list, list) {
663 struct sk_buff *skb;
664
665 skb = create_monitor_event(hdev, HCI_DEV_REG);
666 if (!skb)
667 continue;
668
669 if (sock_queue_rcv_skb(sk, skb))
670 kfree_skb(skb);
671
672 if (!test_bit(HCI_RUNNING, &hdev->flags))
673 continue;
674
675 skb = create_monitor_event(hdev, HCI_DEV_OPEN);
676 if (!skb)
677 continue;
678
679 if (sock_queue_rcv_skb(sk, skb))
680 kfree_skb(skb);
681
682 if (test_bit(HCI_UP, &hdev->flags))
683 skb = create_monitor_event(hdev, HCI_DEV_UP);
684 else if (hci_dev_test_flag(hdev, HCI_SETUP))
685 skb = create_monitor_event(hdev, HCI_DEV_SETUP);
686 else
687 skb = NULL;
688
689 if (skb) {
690 if (sock_queue_rcv_skb(sk, skb))
691 kfree_skb(skb);
692 }
693 }
694
695 read_unlock(&hci_dev_list_lock);
696}
697
698static void send_monitor_control_replay(struct sock *mon_sk)
699{
700 struct sock *sk;
701
702 read_lock(&hci_sk_list.lock);
703
704 sk_for_each(sk, &hci_sk_list.head) {
705 struct sk_buff *skb;
706
707 skb = create_monitor_ctrl_open(sk);
708 if (!skb)
709 continue;
710
711 if (sock_queue_rcv_skb(mon_sk, skb))
712 kfree_skb(skb);
713 }
714
715 read_unlock(&hci_sk_list.lock);
716}
717
718/* Generate internal stack event */
719static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
720{
721 struct hci_event_hdr *hdr;
722 struct hci_ev_stack_internal *ev;
723 struct sk_buff *skb;
724
725 skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
726 if (!skb)
727 return;
728
729 hdr = skb_put(skb, HCI_EVENT_HDR_SIZE);
730 hdr->evt = HCI_EV_STACK_INTERNAL;
731 hdr->plen = sizeof(*ev) + dlen;
732
733 ev = skb_put(skb, sizeof(*ev) + dlen);
734 ev->type = type;
735 memcpy(ev->data, data, dlen);
736
737 bt_cb(skb)->incoming = 1;
738 __net_timestamp(skb);
739
740 hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
741 hci_send_to_sock(hdev, skb);
742 kfree_skb(skb);
743}
744
745void hci_sock_dev_event(struct hci_dev *hdev, int event)
746{
747 BT_DBG("hdev %s event %d", hdev->name, event);
748
749 if (atomic_read(&monitor_promisc)) {
750 struct sk_buff *skb;
751
752 /* Send event to monitor */
753 skb = create_monitor_event(hdev, event);
754 if (skb) {
755 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
756 HCI_SOCK_TRUSTED, NULL);
757 kfree_skb(skb);
758 }
759 }
760
761 if (event <= HCI_DEV_DOWN) {
762 struct hci_ev_si_device ev;
763
764 /* Send event to sockets */
765 ev.event = event;
766 ev.dev_id = hdev->id;
767 hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
768 }
769
770 if (event == HCI_DEV_UNREG) {
771 struct sock *sk;
772
773 /* Wake up sockets using this dead device */
774 read_lock(&hci_sk_list.lock);
775 sk_for_each(sk, &hci_sk_list.head) {
776 if (hci_pi(sk)->hdev == hdev) {
777 sk->sk_err = EPIPE;
778 sk->sk_state_change(sk);
779 }
780 }
781 read_unlock(&hci_sk_list.lock);
782 }
783}
784
785static struct hci_mgmt_chan *__hci_mgmt_chan_find(unsigned short channel)
786{
787 struct hci_mgmt_chan *c;
788
789 list_for_each_entry(c, &mgmt_chan_list, list) {
790 if (c->channel == channel)
791 return c;
792 }
793
794 return NULL;
795}
796
797static struct hci_mgmt_chan *hci_mgmt_chan_find(unsigned short channel)
798{
799 struct hci_mgmt_chan *c;
800
801 mutex_lock(&mgmt_chan_list_lock);
802 c = __hci_mgmt_chan_find(channel);
803 mutex_unlock(&mgmt_chan_list_lock);
804
805 return c;
806}
807
808int hci_mgmt_chan_register(struct hci_mgmt_chan *c)
809{
810 if (c->channel < HCI_CHANNEL_CONTROL)
811 return -EINVAL;
812
813 mutex_lock(&mgmt_chan_list_lock);
814 if (__hci_mgmt_chan_find(c->channel)) {
815 mutex_unlock(&mgmt_chan_list_lock);
816 return -EALREADY;
817 }
818
819 list_add_tail(&c->list, &mgmt_chan_list);
820
821 mutex_unlock(&mgmt_chan_list_lock);
822
823 return 0;
824}
825EXPORT_SYMBOL(hci_mgmt_chan_register);
826
827void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c)
828{
829 mutex_lock(&mgmt_chan_list_lock);
830 list_del(&c->list);
831 mutex_unlock(&mgmt_chan_list_lock);
832}
833EXPORT_SYMBOL(hci_mgmt_chan_unregister);
834
835static int hci_sock_release(struct socket *sock)
836{
837 struct sock *sk = sock->sk;
838 struct hci_dev *hdev;
839 struct sk_buff *skb;
840
841 BT_DBG("sock %p sk %p", sock, sk);
842
843 if (!sk)
844 return 0;
845
846 lock_sock(sk);
847
848 switch (hci_pi(sk)->channel) {
849 case HCI_CHANNEL_MONITOR:
850 atomic_dec(&monitor_promisc);
851 break;
852 case HCI_CHANNEL_RAW:
853 case HCI_CHANNEL_USER:
854 case HCI_CHANNEL_CONTROL:
855 /* Send event to monitor */
856 skb = create_monitor_ctrl_close(sk);
857 if (skb) {
858 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
859 HCI_SOCK_TRUSTED, NULL);
860 kfree_skb(skb);
861 }
862
863 hci_sock_free_cookie(sk);
864 break;
865 }
866
867 bt_sock_unlink(&hci_sk_list, sk);
868
869 hdev = hci_pi(sk)->hdev;
870 if (hdev) {
871 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
872 /* When releasing a user channel exclusive access,
873 * call hci_dev_do_close directly instead of calling
874 * hci_dev_close to ensure the exclusive access will
875 * be released and the controller brought back down.
876 *
877 * The checking of HCI_AUTO_OFF is not needed in this
878 * case since it will have been cleared already when
879 * opening the user channel.
880 */
881 hci_dev_do_close(hdev);
882 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
883 mgmt_index_added(hdev);
884 }
885
886 atomic_dec(&hdev->promisc);
887 hci_dev_put(hdev);
888 }
889
890 sock_orphan(sk);
891
892 skb_queue_purge(&sk->sk_receive_queue);
893 skb_queue_purge(&sk->sk_write_queue);
894
895 release_sock(sk);
896 sock_put(sk);
897 return 0;
898}
899
900static int hci_sock_reject_list_add(struct hci_dev *hdev, void __user *arg)
901{
902 bdaddr_t bdaddr;
903 int err;
904
905 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
906 return -EFAULT;
907
908 hci_dev_lock(hdev);
909
910 err = hci_bdaddr_list_add(&hdev->reject_list, &bdaddr, BDADDR_BREDR);
911
912 hci_dev_unlock(hdev);
913
914 return err;
915}
916
917static int hci_sock_reject_list_del(struct hci_dev *hdev, void __user *arg)
918{
919 bdaddr_t bdaddr;
920 int err;
921
922 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
923 return -EFAULT;
924
925 hci_dev_lock(hdev);
926
927 err = hci_bdaddr_list_del(&hdev->reject_list, &bdaddr, BDADDR_BREDR);
928
929 hci_dev_unlock(hdev);
930
931 return err;
932}
933
934/* Ioctls that require bound socket */
935static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
936 unsigned long arg)
937{
938 struct hci_dev *hdev = hci_hdev_from_sock(sk);
939
940 if (IS_ERR(hdev))
941 return PTR_ERR(hdev);
942
943 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
944 return -EBUSY;
945
946 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
947 return -EOPNOTSUPP;
948
949 if (hdev->dev_type != HCI_PRIMARY)
950 return -EOPNOTSUPP;
951
952 switch (cmd) {
953 case HCISETRAW:
954 if (!capable(CAP_NET_ADMIN))
955 return -EPERM;
956 return -EOPNOTSUPP;
957
958 case HCIGETCONNINFO:
959 return hci_get_conn_info(hdev, (void __user *)arg);
960
961 case HCIGETAUTHINFO:
962 return hci_get_auth_info(hdev, (void __user *)arg);
963
964 case HCIBLOCKADDR:
965 if (!capable(CAP_NET_ADMIN))
966 return -EPERM;
967 return hci_sock_reject_list_add(hdev, (void __user *)arg);
968
969 case HCIUNBLOCKADDR:
970 if (!capable(CAP_NET_ADMIN))
971 return -EPERM;
972 return hci_sock_reject_list_del(hdev, (void __user *)arg);
973 }
974
975 return -ENOIOCTLCMD;
976}
977
978static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
979 unsigned long arg)
980{
981 void __user *argp = (void __user *)arg;
982 struct sock *sk = sock->sk;
983 int err;
984
985 BT_DBG("cmd %x arg %lx", cmd, arg);
986
987 lock_sock(sk);
988
989 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
990 err = -EBADFD;
991 goto done;
992 }
993
994 /* When calling an ioctl on an unbound raw socket, then ensure
995 * that the monitor gets informed. Ensure that the resulting event
996 * is only send once by checking if the cookie exists or not. The
997 * socket cookie will be only ever generated once for the lifetime
998 * of a given socket.
999 */
1000 if (hci_sock_gen_cookie(sk)) {
1001 struct sk_buff *skb;
1002
1003 if (capable(CAP_NET_ADMIN))
1004 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1005
1006 /* Send event to monitor */
1007 skb = create_monitor_ctrl_open(sk);
1008 if (skb) {
1009 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1010 HCI_SOCK_TRUSTED, NULL);
1011 kfree_skb(skb);
1012 }
1013 }
1014
1015 release_sock(sk);
1016
1017 switch (cmd) {
1018 case HCIGETDEVLIST:
1019 return hci_get_dev_list(argp);
1020
1021 case HCIGETDEVINFO:
1022 return hci_get_dev_info(argp);
1023
1024 case HCIGETCONNLIST:
1025 return hci_get_conn_list(argp);
1026
1027 case HCIDEVUP:
1028 if (!capable(CAP_NET_ADMIN))
1029 return -EPERM;
1030 return hci_dev_open(arg);
1031
1032 case HCIDEVDOWN:
1033 if (!capable(CAP_NET_ADMIN))
1034 return -EPERM;
1035 return hci_dev_close(arg);
1036
1037 case HCIDEVRESET:
1038 if (!capable(CAP_NET_ADMIN))
1039 return -EPERM;
1040 return hci_dev_reset(arg);
1041
1042 case HCIDEVRESTAT:
1043 if (!capable(CAP_NET_ADMIN))
1044 return -EPERM;
1045 return hci_dev_reset_stat(arg);
1046
1047 case HCISETSCAN:
1048 case HCISETAUTH:
1049 case HCISETENCRYPT:
1050 case HCISETPTYPE:
1051 case HCISETLINKPOL:
1052 case HCISETLINKMODE:
1053 case HCISETACLMTU:
1054 case HCISETSCOMTU:
1055 if (!capable(CAP_NET_ADMIN))
1056 return -EPERM;
1057 return hci_dev_cmd(cmd, argp);
1058
1059 case HCIINQUIRY:
1060 return hci_inquiry(argp);
1061 }
1062
1063 lock_sock(sk);
1064
1065 err = hci_sock_bound_ioctl(sk, cmd, arg);
1066
1067done:
1068 release_sock(sk);
1069 return err;
1070}
1071
1072#ifdef CONFIG_COMPAT
1073static int hci_sock_compat_ioctl(struct socket *sock, unsigned int cmd,
1074 unsigned long arg)
1075{
1076 switch (cmd) {
1077 case HCIDEVUP:
1078 case HCIDEVDOWN:
1079 case HCIDEVRESET:
1080 case HCIDEVRESTAT:
1081 return hci_sock_ioctl(sock, cmd, arg);
1082 }
1083
1084 return hci_sock_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1085}
1086#endif
1087
1088static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
1089 int addr_len)
1090{
1091 struct sockaddr_hci haddr;
1092 struct sock *sk = sock->sk;
1093 struct hci_dev *hdev = NULL;
1094 struct sk_buff *skb;
1095 int len, err = 0;
1096
1097 BT_DBG("sock %p sk %p", sock, sk);
1098
1099 if (!addr)
1100 return -EINVAL;
1101
1102 memset(&haddr, 0, sizeof(haddr));
1103 len = min_t(unsigned int, sizeof(haddr), addr_len);
1104 memcpy(&haddr, addr, len);
1105
1106 if (haddr.hci_family != AF_BLUETOOTH)
1107 return -EINVAL;
1108
1109 lock_sock(sk);
1110
1111 /* Allow detaching from dead device and attaching to alive device, if
1112 * the caller wants to re-bind (instead of close) this socket in
1113 * response to hci_sock_dev_event(HCI_DEV_UNREG) notification.
1114 */
1115 hdev = hci_pi(sk)->hdev;
1116 if (hdev && hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
1117 hci_pi(sk)->hdev = NULL;
1118 sk->sk_state = BT_OPEN;
1119 hci_dev_put(hdev);
1120 }
1121 hdev = NULL;
1122
1123 if (sk->sk_state == BT_BOUND) {
1124 err = -EALREADY;
1125 goto done;
1126 }
1127
1128 switch (haddr.hci_channel) {
1129 case HCI_CHANNEL_RAW:
1130 if (hci_pi(sk)->hdev) {
1131 err = -EALREADY;
1132 goto done;
1133 }
1134
1135 if (haddr.hci_dev != HCI_DEV_NONE) {
1136 hdev = hci_dev_get(haddr.hci_dev);
1137 if (!hdev) {
1138 err = -ENODEV;
1139 goto done;
1140 }
1141
1142 atomic_inc(&hdev->promisc);
1143 }
1144
1145 hci_pi(sk)->channel = haddr.hci_channel;
1146
1147 if (!hci_sock_gen_cookie(sk)) {
1148 /* In the case when a cookie has already been assigned,
1149 * then there has been already an ioctl issued against
1150 * an unbound socket and with that triggered an open
1151 * notification. Send a close notification first to
1152 * allow the state transition to bounded.
1153 */
1154 skb = create_monitor_ctrl_close(sk);
1155 if (skb) {
1156 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1157 HCI_SOCK_TRUSTED, NULL);
1158 kfree_skb(skb);
1159 }
1160 }
1161
1162 if (capable(CAP_NET_ADMIN))
1163 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1164
1165 hci_pi(sk)->hdev = hdev;
1166
1167 /* Send event to monitor */
1168 skb = create_monitor_ctrl_open(sk);
1169 if (skb) {
1170 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1171 HCI_SOCK_TRUSTED, NULL);
1172 kfree_skb(skb);
1173 }
1174 break;
1175
1176 case HCI_CHANNEL_USER:
1177 if (hci_pi(sk)->hdev) {
1178 err = -EALREADY;
1179 goto done;
1180 }
1181
1182 if (haddr.hci_dev == HCI_DEV_NONE) {
1183 err = -EINVAL;
1184 goto done;
1185 }
1186
1187 if (!capable(CAP_NET_ADMIN)) {
1188 err = -EPERM;
1189 goto done;
1190 }
1191
1192 hdev = hci_dev_get(haddr.hci_dev);
1193 if (!hdev) {
1194 err = -ENODEV;
1195 goto done;
1196 }
1197
1198 if (test_bit(HCI_INIT, &hdev->flags) ||
1199 hci_dev_test_flag(hdev, HCI_SETUP) ||
1200 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1201 (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) &&
1202 test_bit(HCI_UP, &hdev->flags))) {
1203 err = -EBUSY;
1204 hci_dev_put(hdev);
1205 goto done;
1206 }
1207
1208 if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) {
1209 err = -EUSERS;
1210 hci_dev_put(hdev);
1211 goto done;
1212 }
1213
1214 mgmt_index_removed(hdev);
1215
1216 err = hci_dev_open(hdev->id);
1217 if (err) {
1218 if (err == -EALREADY) {
1219 /* In case the transport is already up and
1220 * running, clear the error here.
1221 *
1222 * This can happen when opening a user
1223 * channel and HCI_AUTO_OFF grace period
1224 * is still active.
1225 */
1226 err = 0;
1227 } else {
1228 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
1229 mgmt_index_added(hdev);
1230 hci_dev_put(hdev);
1231 goto done;
1232 }
1233 }
1234
1235 hci_pi(sk)->channel = haddr.hci_channel;
1236
1237 if (!hci_sock_gen_cookie(sk)) {
1238 /* In the case when a cookie has already been assigned,
1239 * this socket will transition from a raw socket into
1240 * a user channel socket. For a clean transition, send
1241 * the close notification first.
1242 */
1243 skb = create_monitor_ctrl_close(sk);
1244 if (skb) {
1245 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1246 HCI_SOCK_TRUSTED, NULL);
1247 kfree_skb(skb);
1248 }
1249 }
1250
1251 /* The user channel is restricted to CAP_NET_ADMIN
1252 * capabilities and with that implicitly trusted.
1253 */
1254 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1255
1256 hci_pi(sk)->hdev = hdev;
1257
1258 /* Send event to monitor */
1259 skb = create_monitor_ctrl_open(sk);
1260 if (skb) {
1261 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1262 HCI_SOCK_TRUSTED, NULL);
1263 kfree_skb(skb);
1264 }
1265
1266 atomic_inc(&hdev->promisc);
1267 break;
1268
1269 case HCI_CHANNEL_MONITOR:
1270 if (haddr.hci_dev != HCI_DEV_NONE) {
1271 err = -EINVAL;
1272 goto done;
1273 }
1274
1275 if (!capable(CAP_NET_RAW)) {
1276 err = -EPERM;
1277 goto done;
1278 }
1279
1280 hci_pi(sk)->channel = haddr.hci_channel;
1281
1282 /* The monitor interface is restricted to CAP_NET_RAW
1283 * capabilities and with that implicitly trusted.
1284 */
1285 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1286
1287 send_monitor_note(sk, "Linux version %s (%s)",
1288 init_utsname()->release,
1289 init_utsname()->machine);
1290 send_monitor_note(sk, "Bluetooth subsystem version %u.%u",
1291 BT_SUBSYS_VERSION, BT_SUBSYS_REVISION);
1292 send_monitor_replay(sk);
1293 send_monitor_control_replay(sk);
1294
1295 atomic_inc(&monitor_promisc);
1296 break;
1297
1298 case HCI_CHANNEL_LOGGING:
1299 if (haddr.hci_dev != HCI_DEV_NONE) {
1300 err = -EINVAL;
1301 goto done;
1302 }
1303
1304 if (!capable(CAP_NET_ADMIN)) {
1305 err = -EPERM;
1306 goto done;
1307 }
1308
1309 hci_pi(sk)->channel = haddr.hci_channel;
1310 break;
1311
1312 default:
1313 if (!hci_mgmt_chan_find(haddr.hci_channel)) {
1314 err = -EINVAL;
1315 goto done;
1316 }
1317
1318 if (haddr.hci_dev != HCI_DEV_NONE) {
1319 err = -EINVAL;
1320 goto done;
1321 }
1322
1323 /* Users with CAP_NET_ADMIN capabilities are allowed
1324 * access to all management commands and events. For
1325 * untrusted users the interface is restricted and
1326 * also only untrusted events are sent.
1327 */
1328 if (capable(CAP_NET_ADMIN))
1329 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1330
1331 hci_pi(sk)->channel = haddr.hci_channel;
1332
1333 /* At the moment the index and unconfigured index events
1334 * are enabled unconditionally. Setting them on each
1335 * socket when binding keeps this functionality. They
1336 * however might be cleared later and then sending of these
1337 * events will be disabled, but that is then intentional.
1338 *
1339 * This also enables generic events that are safe to be
1340 * received by untrusted users. Example for such events
1341 * are changes to settings, class of device, name etc.
1342 */
1343 if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) {
1344 if (!hci_sock_gen_cookie(sk)) {
1345 /* In the case when a cookie has already been
1346 * assigned, this socket will transition from
1347 * a raw socket into a control socket. To
1348 * allow for a clean transition, send the
1349 * close notification first.
1350 */
1351 skb = create_monitor_ctrl_close(sk);
1352 if (skb) {
1353 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1354 HCI_SOCK_TRUSTED, NULL);
1355 kfree_skb(skb);
1356 }
1357 }
1358
1359 /* Send event to monitor */
1360 skb = create_monitor_ctrl_open(sk);
1361 if (skb) {
1362 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1363 HCI_SOCK_TRUSTED, NULL);
1364 kfree_skb(skb);
1365 }
1366
1367 hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS);
1368 hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);
1369 hci_sock_set_flag(sk, HCI_MGMT_OPTION_EVENTS);
1370 hci_sock_set_flag(sk, HCI_MGMT_SETTING_EVENTS);
1371 hci_sock_set_flag(sk, HCI_MGMT_DEV_CLASS_EVENTS);
1372 hci_sock_set_flag(sk, HCI_MGMT_LOCAL_NAME_EVENTS);
1373 }
1374 break;
1375 }
1376
1377 sk->sk_state = BT_BOUND;
1378
1379done:
1380 release_sock(sk);
1381 return err;
1382}
1383
1384static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
1385 int peer)
1386{
1387 struct sockaddr_hci *haddr = (struct sockaddr_hci *)addr;
1388 struct sock *sk = sock->sk;
1389 struct hci_dev *hdev;
1390 int err = 0;
1391
1392 BT_DBG("sock %p sk %p", sock, sk);
1393
1394 if (peer)
1395 return -EOPNOTSUPP;
1396
1397 lock_sock(sk);
1398
1399 hdev = hci_hdev_from_sock(sk);
1400 if (IS_ERR(hdev)) {
1401 err = PTR_ERR(hdev);
1402 goto done;
1403 }
1404
1405 haddr->hci_family = AF_BLUETOOTH;
1406 haddr->hci_dev = hdev->id;
1407 haddr->hci_channel= hci_pi(sk)->channel;
1408 err = sizeof(*haddr);
1409
1410done:
1411 release_sock(sk);
1412 return err;
1413}
1414
1415static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
1416 struct sk_buff *skb)
1417{
1418 __u8 mask = hci_pi(sk)->cmsg_mask;
1419
1420 if (mask & HCI_CMSG_DIR) {
1421 int incoming = bt_cb(skb)->incoming;
1422 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
1423 &incoming);
1424 }
1425
1426 if (mask & HCI_CMSG_TSTAMP) {
1427#ifdef CONFIG_COMPAT
1428 struct old_timeval32 ctv;
1429#endif
1430 struct __kernel_old_timeval tv;
1431 void *data;
1432 int len;
1433
1434 skb_get_timestamp(skb, &tv);
1435
1436 data = &tv;
1437 len = sizeof(tv);
1438#ifdef CONFIG_COMPAT
1439 if (!COMPAT_USE_64BIT_TIME &&
1440 (msg->msg_flags & MSG_CMSG_COMPAT)) {
1441 ctv.tv_sec = tv.tv_sec;
1442 ctv.tv_usec = tv.tv_usec;
1443 data = &ctv;
1444 len = sizeof(ctv);
1445 }
1446#endif
1447
1448 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
1449 }
1450}
1451
1452static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1453 size_t len, int flags)
1454{
1455 int noblock = flags & MSG_DONTWAIT;
1456 struct sock *sk = sock->sk;
1457 struct sk_buff *skb;
1458 int copied, err;
1459 unsigned int skblen;
1460
1461 BT_DBG("sock %p, sk %p", sock, sk);
1462
1463 if (flags & MSG_OOB)
1464 return -EOPNOTSUPP;
1465
1466 if (hci_pi(sk)->channel == HCI_CHANNEL_LOGGING)
1467 return -EOPNOTSUPP;
1468
1469 if (sk->sk_state == BT_CLOSED)
1470 return 0;
1471
1472 skb = skb_recv_datagram(sk, flags, noblock, &err);
1473 if (!skb)
1474 return err;
1475
1476 skblen = skb->len;
1477 copied = skb->len;
1478 if (len < copied) {
1479 msg->msg_flags |= MSG_TRUNC;
1480 copied = len;
1481 }
1482
1483 skb_reset_transport_header(skb);
1484 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1485
1486 switch (hci_pi(sk)->channel) {
1487 case HCI_CHANNEL_RAW:
1488 hci_sock_cmsg(sk, msg, skb);
1489 break;
1490 case HCI_CHANNEL_USER:
1491 case HCI_CHANNEL_MONITOR:
1492 sock_recv_timestamp(msg, sk, skb);
1493 break;
1494 default:
1495 if (hci_mgmt_chan_find(hci_pi(sk)->channel))
1496 sock_recv_timestamp(msg, sk, skb);
1497 break;
1498 }
1499
1500 skb_free_datagram(sk, skb);
1501
1502 if (flags & MSG_TRUNC)
1503 copied = skblen;
1504
1505 return err ? : copied;
1506}
1507
1508static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
1509 struct msghdr *msg, size_t msglen)
1510{
1511 void *buf;
1512 u8 *cp;
1513 struct mgmt_hdr *hdr;
1514 u16 opcode, index, len;
1515 struct hci_dev *hdev = NULL;
1516 const struct hci_mgmt_handler *handler;
1517 bool var_len, no_hdev;
1518 int err;
1519
1520 BT_DBG("got %zu bytes", msglen);
1521
1522 if (msglen < sizeof(*hdr))
1523 return -EINVAL;
1524
1525 buf = kmalloc(msglen, GFP_KERNEL);
1526 if (!buf)
1527 return -ENOMEM;
1528
1529 if (memcpy_from_msg(buf, msg, msglen)) {
1530 err = -EFAULT;
1531 goto done;
1532 }
1533
1534 hdr = buf;
1535 opcode = __le16_to_cpu(hdr->opcode);
1536 index = __le16_to_cpu(hdr->index);
1537 len = __le16_to_cpu(hdr->len);
1538
1539 if (len != msglen - sizeof(*hdr)) {
1540 err = -EINVAL;
1541 goto done;
1542 }
1543
1544 if (chan->channel == HCI_CHANNEL_CONTROL) {
1545 struct sk_buff *skb;
1546
1547 /* Send event to monitor */
1548 skb = create_monitor_ctrl_command(sk, index, opcode, len,
1549 buf + sizeof(*hdr));
1550 if (skb) {
1551 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1552 HCI_SOCK_TRUSTED, NULL);
1553 kfree_skb(skb);
1554 }
1555 }
1556
1557 if (opcode >= chan->handler_count ||
1558 chan->handlers[opcode].func == NULL) {
1559 BT_DBG("Unknown op %u", opcode);
1560 err = mgmt_cmd_status(sk, index, opcode,
1561 MGMT_STATUS_UNKNOWN_COMMAND);
1562 goto done;
1563 }
1564
1565 handler = &chan->handlers[opcode];
1566
1567 if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
1568 !(handler->flags & HCI_MGMT_UNTRUSTED)) {
1569 err = mgmt_cmd_status(sk, index, opcode,
1570 MGMT_STATUS_PERMISSION_DENIED);
1571 goto done;
1572 }
1573
1574 if (index != MGMT_INDEX_NONE) {
1575 hdev = hci_dev_get(index);
1576 if (!hdev) {
1577 err = mgmt_cmd_status(sk, index, opcode,
1578 MGMT_STATUS_INVALID_INDEX);
1579 goto done;
1580 }
1581
1582 if (hci_dev_test_flag(hdev, HCI_SETUP) ||
1583 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1584 hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1585 err = mgmt_cmd_status(sk, index, opcode,
1586 MGMT_STATUS_INVALID_INDEX);
1587 goto done;
1588 }
1589
1590 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1591 !(handler->flags & HCI_MGMT_UNCONFIGURED)) {
1592 err = mgmt_cmd_status(sk, index, opcode,
1593 MGMT_STATUS_INVALID_INDEX);
1594 goto done;
1595 }
1596 }
1597
1598 if (!(handler->flags & HCI_MGMT_HDEV_OPTIONAL)) {
1599 no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
1600 if (no_hdev != !hdev) {
1601 err = mgmt_cmd_status(sk, index, opcode,
1602 MGMT_STATUS_INVALID_INDEX);
1603 goto done;
1604 }
1605 }
1606
1607 var_len = (handler->flags & HCI_MGMT_VAR_LEN);
1608 if ((var_len && len < handler->data_len) ||
1609 (!var_len && len != handler->data_len)) {
1610 err = mgmt_cmd_status(sk, index, opcode,
1611 MGMT_STATUS_INVALID_PARAMS);
1612 goto done;
1613 }
1614
1615 if (hdev && chan->hdev_init)
1616 chan->hdev_init(sk, hdev);
1617
1618 cp = buf + sizeof(*hdr);
1619
1620 err = handler->func(sk, hdev, cp, len);
1621 if (err < 0)
1622 goto done;
1623
1624 err = msglen;
1625
1626done:
1627 if (hdev)
1628 hci_dev_put(hdev);
1629
1630 kfree(buf);
1631 return err;
1632}
1633
1634static int hci_logging_frame(struct sock *sk, struct msghdr *msg, int len)
1635{
1636 struct hci_mon_hdr *hdr;
1637 struct sk_buff *skb;
1638 struct hci_dev *hdev;
1639 u16 index;
1640 int err;
1641
1642 /* The logging frame consists at minimum of the standard header,
1643 * the priority byte, the ident length byte and at least one string
1644 * terminator NUL byte. Anything shorter are invalid packets.
1645 */
1646 if (len < sizeof(*hdr) + 3)
1647 return -EINVAL;
1648
1649 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1650 if (!skb)
1651 return err;
1652
1653 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1654 err = -EFAULT;
1655 goto drop;
1656 }
1657
1658 hdr = (void *)skb->data;
1659
1660 if (__le16_to_cpu(hdr->len) != len - sizeof(*hdr)) {
1661 err = -EINVAL;
1662 goto drop;
1663 }
1664
1665 if (__le16_to_cpu(hdr->opcode) == 0x0000) {
1666 __u8 priority = skb->data[sizeof(*hdr)];
1667 __u8 ident_len = skb->data[sizeof(*hdr) + 1];
1668
1669 /* Only the priorities 0-7 are valid and with that any other
1670 * value results in an invalid packet.
1671 *
1672 * The priority byte is followed by an ident length byte and
1673 * the NUL terminated ident string. Check that the ident
1674 * length is not overflowing the packet and also that the
1675 * ident string itself is NUL terminated. In case the ident
1676 * length is zero, the length value actually doubles as NUL
1677 * terminator identifier.
1678 *
1679 * The message follows the ident string (if present) and
1680 * must be NUL terminated. Otherwise it is not a valid packet.
1681 */
1682 if (priority > 7 || skb->data[len - 1] != 0x00 ||
1683 ident_len > len - sizeof(*hdr) - 3 ||
1684 skb->data[sizeof(*hdr) + ident_len + 1] != 0x00) {
1685 err = -EINVAL;
1686 goto drop;
1687 }
1688 } else {
1689 err = -EINVAL;
1690 goto drop;
1691 }
1692
1693 index = __le16_to_cpu(hdr->index);
1694
1695 if (index != MGMT_INDEX_NONE) {
1696 hdev = hci_dev_get(index);
1697 if (!hdev) {
1698 err = -ENODEV;
1699 goto drop;
1700 }
1701 } else {
1702 hdev = NULL;
1703 }
1704
1705 hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING);
1706
1707 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL);
1708 err = len;
1709
1710 if (hdev)
1711 hci_dev_put(hdev);
1712
1713drop:
1714 kfree_skb(skb);
1715 return err;
1716}
1717
1718static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1719 size_t len)
1720{
1721 struct sock *sk = sock->sk;
1722 struct hci_mgmt_chan *chan;
1723 struct hci_dev *hdev;
1724 struct sk_buff *skb;
1725 int err;
1726
1727 BT_DBG("sock %p sk %p", sock, sk);
1728
1729 if (msg->msg_flags & MSG_OOB)
1730 return -EOPNOTSUPP;
1731
1732 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE|
1733 MSG_CMSG_COMPAT))
1734 return -EINVAL;
1735
1736 if (len < 4 || len > HCI_MAX_FRAME_SIZE)
1737 return -EINVAL;
1738
1739 lock_sock(sk);
1740
1741 switch (hci_pi(sk)->channel) {
1742 case HCI_CHANNEL_RAW:
1743 case HCI_CHANNEL_USER:
1744 break;
1745 case HCI_CHANNEL_MONITOR:
1746 err = -EOPNOTSUPP;
1747 goto done;
1748 case HCI_CHANNEL_LOGGING:
1749 err = hci_logging_frame(sk, msg, len);
1750 goto done;
1751 default:
1752 mutex_lock(&mgmt_chan_list_lock);
1753 chan = __hci_mgmt_chan_find(hci_pi(sk)->channel);
1754 if (chan)
1755 err = hci_mgmt_cmd(chan, sk, msg, len);
1756 else
1757 err = -EINVAL;
1758
1759 mutex_unlock(&mgmt_chan_list_lock);
1760 goto done;
1761 }
1762
1763 hdev = hci_hdev_from_sock(sk);
1764 if (IS_ERR(hdev)) {
1765 err = PTR_ERR(hdev);
1766 goto done;
1767 }
1768
1769 if (!test_bit(HCI_UP, &hdev->flags)) {
1770 err = -ENETDOWN;
1771 goto done;
1772 }
1773
1774 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1775 if (!skb)
1776 goto done;
1777
1778 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1779 err = -EFAULT;
1780 goto drop;
1781 }
1782
1783 hci_skb_pkt_type(skb) = skb->data[0];
1784 skb_pull(skb, 1);
1785
1786 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
1787 /* No permission check is needed for user channel
1788 * since that gets enforced when binding the socket.
1789 *
1790 * However check that the packet type is valid.
1791 */
1792 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
1793 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1794 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
1795 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) {
1796 err = -EINVAL;
1797 goto drop;
1798 }
1799
1800 skb_queue_tail(&hdev->raw_q, skb);
1801 queue_work(hdev->workqueue, &hdev->tx_work);
1802 } else if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
1803 u16 opcode = get_unaligned_le16(skb->data);
1804 u16 ogf = hci_opcode_ogf(opcode);
1805 u16 ocf = hci_opcode_ocf(opcode);
1806
1807 if (((ogf > HCI_SFLT_MAX_OGF) ||
1808 !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
1809 &hci_sec_filter.ocf_mask[ogf])) &&
1810 !capable(CAP_NET_RAW)) {
1811 err = -EPERM;
1812 goto drop;
1813 }
1814
1815 /* Since the opcode has already been extracted here, store
1816 * a copy of the value for later use by the drivers.
1817 */
1818 hci_skb_opcode(skb) = opcode;
1819
1820 if (ogf == 0x3f) {
1821 skb_queue_tail(&hdev->raw_q, skb);
1822 queue_work(hdev->workqueue, &hdev->tx_work);
1823 } else {
1824 /* Stand-alone HCI commands must be flagged as
1825 * single-command requests.
1826 */
1827 bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
1828
1829 skb_queue_tail(&hdev->cmd_q, skb);
1830 queue_work(hdev->workqueue, &hdev->cmd_work);
1831 }
1832 } else {
1833 if (!capable(CAP_NET_RAW)) {
1834 err = -EPERM;
1835 goto drop;
1836 }
1837
1838 if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1839 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
1840 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) {
1841 err = -EINVAL;
1842 goto drop;
1843 }
1844
1845 skb_queue_tail(&hdev->raw_q, skb);
1846 queue_work(hdev->workqueue, &hdev->tx_work);
1847 }
1848
1849 err = len;
1850
1851done:
1852 release_sock(sk);
1853 return err;
1854
1855drop:
1856 kfree_skb(skb);
1857 goto done;
1858}
1859
1860static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1861 sockptr_t optval, unsigned int len)
1862{
1863 struct hci_ufilter uf = { .opcode = 0 };
1864 struct sock *sk = sock->sk;
1865 int err = 0, opt = 0;
1866
1867 BT_DBG("sk %p, opt %d", sk, optname);
1868
1869 if (level != SOL_HCI)
1870 return -ENOPROTOOPT;
1871
1872 lock_sock(sk);
1873
1874 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1875 err = -EBADFD;
1876 goto done;
1877 }
1878
1879 switch (optname) {
1880 case HCI_DATA_DIR:
1881 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1882 err = -EFAULT;
1883 break;
1884 }
1885
1886 if (opt)
1887 hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1888 else
1889 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1890 break;
1891
1892 case HCI_TIME_STAMP:
1893 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1894 err = -EFAULT;
1895 break;
1896 }
1897
1898 if (opt)
1899 hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1900 else
1901 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1902 break;
1903
1904 case HCI_FILTER:
1905 {
1906 struct hci_filter *f = &hci_pi(sk)->filter;
1907
1908 uf.type_mask = f->type_mask;
1909 uf.opcode = f->opcode;
1910 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1911 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1912 }
1913
1914 len = min_t(unsigned int, len, sizeof(uf));
1915 if (copy_from_sockptr(&uf, optval, len)) {
1916 err = -EFAULT;
1917 break;
1918 }
1919
1920 if (!capable(CAP_NET_RAW)) {
1921 uf.type_mask &= hci_sec_filter.type_mask;
1922 uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1923 uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1924 }
1925
1926 {
1927 struct hci_filter *f = &hci_pi(sk)->filter;
1928
1929 f->type_mask = uf.type_mask;
1930 f->opcode = uf.opcode;
1931 *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1932 *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1933 }
1934 break;
1935
1936 default:
1937 err = -ENOPROTOOPT;
1938 break;
1939 }
1940
1941done:
1942 release_sock(sk);
1943 return err;
1944}
1945
1946static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
1947 char __user *optval, int __user *optlen)
1948{
1949 struct hci_ufilter uf;
1950 struct sock *sk = sock->sk;
1951 int len, opt, err = 0;
1952
1953 BT_DBG("sk %p, opt %d", sk, optname);
1954
1955 if (level != SOL_HCI)
1956 return -ENOPROTOOPT;
1957
1958 if (get_user(len, optlen))
1959 return -EFAULT;
1960
1961 lock_sock(sk);
1962
1963 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1964 err = -EBADFD;
1965 goto done;
1966 }
1967
1968 switch (optname) {
1969 case HCI_DATA_DIR:
1970 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1971 opt = 1;
1972 else
1973 opt = 0;
1974
1975 if (put_user(opt, optval))
1976 err = -EFAULT;
1977 break;
1978
1979 case HCI_TIME_STAMP:
1980 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1981 opt = 1;
1982 else
1983 opt = 0;
1984
1985 if (put_user(opt, optval))
1986 err = -EFAULT;
1987 break;
1988
1989 case HCI_FILTER:
1990 {
1991 struct hci_filter *f = &hci_pi(sk)->filter;
1992
1993 memset(&uf, 0, sizeof(uf));
1994 uf.type_mask = f->type_mask;
1995 uf.opcode = f->opcode;
1996 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1997 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1998 }
1999
2000 len = min_t(unsigned int, len, sizeof(uf));
2001 if (copy_to_user(optval, &uf, len))
2002 err = -EFAULT;
2003 break;
2004
2005 default:
2006 err = -ENOPROTOOPT;
2007 break;
2008 }
2009
2010done:
2011 release_sock(sk);
2012 return err;
2013}
2014
2015static const struct proto_ops hci_sock_ops = {
2016 .family = PF_BLUETOOTH,
2017 .owner = THIS_MODULE,
2018 .release = hci_sock_release,
2019 .bind = hci_sock_bind,
2020 .getname = hci_sock_getname,
2021 .sendmsg = hci_sock_sendmsg,
2022 .recvmsg = hci_sock_recvmsg,
2023 .ioctl = hci_sock_ioctl,
2024#ifdef CONFIG_COMPAT
2025 .compat_ioctl = hci_sock_compat_ioctl,
2026#endif
2027 .poll = datagram_poll,
2028 .listen = sock_no_listen,
2029 .shutdown = sock_no_shutdown,
2030 .setsockopt = hci_sock_setsockopt,
2031 .getsockopt = hci_sock_getsockopt,
2032 .connect = sock_no_connect,
2033 .socketpair = sock_no_socketpair,
2034 .accept = sock_no_accept,
2035 .mmap = sock_no_mmap
2036};
2037
2038static struct proto hci_sk_proto = {
2039 .name = "HCI",
2040 .owner = THIS_MODULE,
2041 .obj_size = sizeof(struct hci_pinfo)
2042};
2043
2044static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
2045 int kern)
2046{
2047 struct sock *sk;
2048
2049 BT_DBG("sock %p", sock);
2050
2051 if (sock->type != SOCK_RAW)
2052 return -ESOCKTNOSUPPORT;
2053
2054 sock->ops = &hci_sock_ops;
2055
2056 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, kern);
2057 if (!sk)
2058 return -ENOMEM;
2059
2060 sock_init_data(sock, sk);
2061
2062 sock_reset_flag(sk, SOCK_ZAPPED);
2063
2064 sk->sk_protocol = protocol;
2065
2066 sock->state = SS_UNCONNECTED;
2067 sk->sk_state = BT_OPEN;
2068
2069 bt_sock_link(&hci_sk_list, sk);
2070 return 0;
2071}
2072
2073static const struct net_proto_family hci_sock_family_ops = {
2074 .family = PF_BLUETOOTH,
2075 .owner = THIS_MODULE,
2076 .create = hci_sock_create,
2077};
2078
2079int __init hci_sock_init(void)
2080{
2081 int err;
2082
2083 BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr));
2084
2085 err = proto_register(&hci_sk_proto, 0);
2086 if (err < 0)
2087 return err;
2088
2089 err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
2090 if (err < 0) {
2091 BT_ERR("HCI socket registration failed");
2092 goto error;
2093 }
2094
2095 err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
2096 if (err < 0) {
2097 BT_ERR("Failed to create HCI proc file");
2098 bt_sock_unregister(BTPROTO_HCI);
2099 goto error;
2100 }
2101
2102 BT_INFO("HCI socket layer initialized");
2103
2104 return 0;
2105
2106error:
2107 proto_unregister(&hci_sk_proto);
2108 return err;
2109}
2110
2111void hci_sock_cleanup(void)
2112{
2113 bt_procfs_cleanup(&init_net, "hci");
2114 bt_sock_unregister(BTPROTO_HCI);
2115 proto_unregister(&hci_sk_proto);
2116}