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Merge remote-tracking branch 'md/for-next'
[deliverable/linux.git] / net / bluetooth / hci_sock.c
1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23 */
24
25 /* Bluetooth HCI sockets. */
26
27 #include <linux/export.h>
28 #include <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
39 static LIST_HEAD(mgmt_chan_list);
40 static DEFINE_MUTEX(mgmt_chan_list_lock);
41
42 static DEFINE_IDA(sock_cookie_ida);
43
44 static 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
51 struct 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
62 void hci_sock_set_flag(struct sock *sk, int nr)
63 {
64 set_bit(nr, &hci_pi(sk)->flags);
65 }
66
67 void hci_sock_clear_flag(struct sock *sk, int nr)
68 {
69 clear_bit(nr, &hci_pi(sk)->flags);
70 }
71
72 int hci_sock_test_flag(struct sock *sk, int nr)
73 {
74 return test_bit(nr, &hci_pi(sk)->flags);
75 }
76
77 unsigned short hci_sock_get_channel(struct sock *sk)
78 {
79 return hci_pi(sk)->channel;
80 }
81
82 u32 hci_sock_get_cookie(struct sock *sk)
83 {
84 return hci_pi(sk)->cookie;
85 }
86
87 static 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
104 static 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
114 static 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
122 struct hci_sec_filter {
123 __u32 type_mask;
124 __u32 event_mask[2];
125 __u32 ocf_mask[HCI_SFLT_MAX_OGF + 1][4];
126 };
127
128 static 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
149 static struct bt_sock_list hci_sk_list = {
150 .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
151 };
152
153 static 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 */
191 void 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 */
254 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 read_lock(&hci_sk_list.lock);
262
263 sk_for_each(sk, &hci_sk_list.head) {
264 struct sk_buff *nskb;
265
266 /* Ignore socket without the flag set */
267 if (!hci_sock_test_flag(sk, flag))
268 continue;
269
270 /* Skip the original socket */
271 if (sk == skip_sk)
272 continue;
273
274 if (sk->sk_state != BT_BOUND)
275 continue;
276
277 if (hci_pi(sk)->channel != channel)
278 continue;
279
280 nskb = skb_clone(skb, GFP_ATOMIC);
281 if (!nskb)
282 continue;
283
284 if (sock_queue_rcv_skb(sk, nskb))
285 kfree_skb(nskb);
286 }
287
288 read_unlock(&hci_sk_list.lock);
289 }
290
291 /* Send frame to monitor socket */
292 void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
293 {
294 struct sk_buff *skb_copy = NULL;
295 struct hci_mon_hdr *hdr;
296 __le16 opcode;
297
298 if (!atomic_read(&monitor_promisc))
299 return;
300
301 BT_DBG("hdev %p len %d", hdev, skb->len);
302
303 switch (hci_skb_pkt_type(skb)) {
304 case HCI_COMMAND_PKT:
305 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
306 break;
307 case HCI_EVENT_PKT:
308 opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
309 break;
310 case HCI_ACLDATA_PKT:
311 if (bt_cb(skb)->incoming)
312 opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
313 else
314 opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
315 break;
316 case HCI_SCODATA_PKT:
317 if (bt_cb(skb)->incoming)
318 opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
319 else
320 opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
321 break;
322 case HCI_DIAG_PKT:
323 opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG);
324 break;
325 default:
326 return;
327 }
328
329 /* Create a private copy with headroom */
330 skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE, GFP_ATOMIC, true);
331 if (!skb_copy)
332 return;
333
334 /* Put header before the data */
335 hdr = (void *)skb_push(skb_copy, HCI_MON_HDR_SIZE);
336 hdr->opcode = opcode;
337 hdr->index = cpu_to_le16(hdev->id);
338 hdr->len = cpu_to_le16(skb->len);
339
340 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
341 HCI_SOCK_TRUSTED, NULL);
342 kfree_skb(skb_copy);
343 }
344
345 void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
346 void *data, u16 data_len, ktime_t tstamp,
347 int flag, struct sock *skip_sk)
348 {
349 struct sock *sk;
350 __le16 index;
351
352 if (hdev)
353 index = cpu_to_le16(hdev->id);
354 else
355 index = cpu_to_le16(MGMT_INDEX_NONE);
356
357 read_lock(&hci_sk_list.lock);
358
359 sk_for_each(sk, &hci_sk_list.head) {
360 struct hci_mon_hdr *hdr;
361 struct sk_buff *skb;
362
363 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
364 continue;
365
366 /* Ignore socket without the flag set */
367 if (!hci_sock_test_flag(sk, flag))
368 continue;
369
370 /* Skip the original socket */
371 if (sk == skip_sk)
372 continue;
373
374 skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC);
375 if (!skb)
376 continue;
377
378 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
379 put_unaligned_le16(event, skb_put(skb, 2));
380
381 if (data)
382 memcpy(skb_put(skb, data_len), data, data_len);
383
384 skb->tstamp = tstamp;
385
386 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
387 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
388 hdr->index = index;
389 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
390
391 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
392 HCI_SOCK_TRUSTED, NULL);
393 kfree_skb(skb);
394 }
395
396 read_unlock(&hci_sk_list.lock);
397 }
398
399 static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
400 {
401 struct hci_mon_hdr *hdr;
402 struct hci_mon_new_index *ni;
403 struct hci_mon_index_info *ii;
404 struct sk_buff *skb;
405 __le16 opcode;
406
407 switch (event) {
408 case HCI_DEV_REG:
409 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
410 if (!skb)
411 return NULL;
412
413 ni = (void *)skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
414 ni->type = hdev->dev_type;
415 ni->bus = hdev->bus;
416 bacpy(&ni->bdaddr, &hdev->bdaddr);
417 memcpy(ni->name, hdev->name, 8);
418
419 opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
420 break;
421
422 case HCI_DEV_UNREG:
423 skb = bt_skb_alloc(0, GFP_ATOMIC);
424 if (!skb)
425 return NULL;
426
427 opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
428 break;
429
430 case HCI_DEV_SETUP:
431 if (hdev->manufacturer == 0xffff)
432 return NULL;
433
434 /* fall through */
435
436 case HCI_DEV_UP:
437 skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
438 if (!skb)
439 return NULL;
440
441 ii = (void *)skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
442 bacpy(&ii->bdaddr, &hdev->bdaddr);
443 ii->manufacturer = cpu_to_le16(hdev->manufacturer);
444
445 opcode = cpu_to_le16(HCI_MON_INDEX_INFO);
446 break;
447
448 case HCI_DEV_OPEN:
449 skb = bt_skb_alloc(0, GFP_ATOMIC);
450 if (!skb)
451 return NULL;
452
453 opcode = cpu_to_le16(HCI_MON_OPEN_INDEX);
454 break;
455
456 case HCI_DEV_CLOSE:
457 skb = bt_skb_alloc(0, GFP_ATOMIC);
458 if (!skb)
459 return NULL;
460
461 opcode = cpu_to_le16(HCI_MON_CLOSE_INDEX);
462 break;
463
464 default:
465 return NULL;
466 }
467
468 __net_timestamp(skb);
469
470 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
471 hdr->opcode = opcode;
472 hdr->index = cpu_to_le16(hdev->id);
473 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
474
475 return skb;
476 }
477
478 static struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
479 {
480 struct hci_mon_hdr *hdr;
481 struct sk_buff *skb;
482 u16 format;
483 u8 ver[3];
484 u32 flags;
485
486 /* No message needed when cookie is not present */
487 if (!hci_pi(sk)->cookie)
488 return NULL;
489
490 switch (hci_pi(sk)->channel) {
491 case HCI_CHANNEL_RAW:
492 format = 0x0000;
493 ver[0] = BT_SUBSYS_VERSION;
494 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
495 break;
496 case HCI_CHANNEL_USER:
497 format = 0x0001;
498 ver[0] = BT_SUBSYS_VERSION;
499 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
500 break;
501 case HCI_CHANNEL_CONTROL:
502 format = 0x0002;
503 mgmt_fill_version_info(ver);
504 break;
505 default:
506 /* No message for unsupported format */
507 return NULL;
508 }
509
510 skb = bt_skb_alloc(14 + TASK_COMM_LEN , GFP_ATOMIC);
511 if (!skb)
512 return NULL;
513
514 flags = hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) ? 0x1 : 0x0;
515
516 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
517 put_unaligned_le16(format, skb_put(skb, 2));
518 memcpy(skb_put(skb, sizeof(ver)), ver, sizeof(ver));
519 put_unaligned_le32(flags, skb_put(skb, 4));
520 *skb_put(skb, 1) = TASK_COMM_LEN;
521 memcpy(skb_put(skb, TASK_COMM_LEN), hci_pi(sk)->comm, TASK_COMM_LEN);
522
523 __net_timestamp(skb);
524
525 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
526 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_OPEN);
527 if (hci_pi(sk)->hdev)
528 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
529 else
530 hdr->index = cpu_to_le16(HCI_DEV_NONE);
531 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
532
533 return skb;
534 }
535
536 static struct sk_buff *create_monitor_ctrl_close(struct sock *sk)
537 {
538 struct hci_mon_hdr *hdr;
539 struct sk_buff *skb;
540
541 /* No message needed when cookie is not present */
542 if (!hci_pi(sk)->cookie)
543 return NULL;
544
545 switch (hci_pi(sk)->channel) {
546 case HCI_CHANNEL_RAW:
547 case HCI_CHANNEL_USER:
548 case HCI_CHANNEL_CONTROL:
549 break;
550 default:
551 /* No message for unsupported format */
552 return NULL;
553 }
554
555 skb = bt_skb_alloc(4, GFP_ATOMIC);
556 if (!skb)
557 return NULL;
558
559 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
560
561 __net_timestamp(skb);
562
563 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
564 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_CLOSE);
565 if (hci_pi(sk)->hdev)
566 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
567 else
568 hdr->index = cpu_to_le16(HCI_DEV_NONE);
569 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
570
571 return skb;
572 }
573
574 static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index,
575 u16 opcode, u16 len,
576 const void *buf)
577 {
578 struct hci_mon_hdr *hdr;
579 struct sk_buff *skb;
580
581 skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
582 if (!skb)
583 return NULL;
584
585 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
586 put_unaligned_le16(opcode, skb_put(skb, 2));
587
588 if (buf)
589 memcpy(skb_put(skb, len), buf, len);
590
591 __net_timestamp(skb);
592
593 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
594 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND);
595 hdr->index = cpu_to_le16(index);
596 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
597
598 return skb;
599 }
600
601 static void __printf(2, 3)
602 send_monitor_note(struct sock *sk, const char *fmt, ...)
603 {
604 size_t len;
605 struct hci_mon_hdr *hdr;
606 struct sk_buff *skb;
607 va_list args;
608
609 va_start(args, fmt);
610 len = vsnprintf(NULL, 0, fmt, args);
611 va_end(args);
612
613 skb = bt_skb_alloc(len + 1, GFP_ATOMIC);
614 if (!skb)
615 return;
616
617 va_start(args, fmt);
618 vsprintf(skb_put(skb, len), fmt, args);
619 *skb_put(skb, 1) = 0;
620 va_end(args);
621
622 __net_timestamp(skb);
623
624 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
625 hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE);
626 hdr->index = cpu_to_le16(HCI_DEV_NONE);
627 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
628
629 if (sock_queue_rcv_skb(sk, skb))
630 kfree_skb(skb);
631 }
632
633 static void send_monitor_replay(struct sock *sk)
634 {
635 struct hci_dev *hdev;
636
637 read_lock(&hci_dev_list_lock);
638
639 list_for_each_entry(hdev, &hci_dev_list, list) {
640 struct sk_buff *skb;
641
642 skb = create_monitor_event(hdev, HCI_DEV_REG);
643 if (!skb)
644 continue;
645
646 if (sock_queue_rcv_skb(sk, skb))
647 kfree_skb(skb);
648
649 if (!test_bit(HCI_RUNNING, &hdev->flags))
650 continue;
651
652 skb = create_monitor_event(hdev, HCI_DEV_OPEN);
653 if (!skb)
654 continue;
655
656 if (sock_queue_rcv_skb(sk, skb))
657 kfree_skb(skb);
658
659 if (test_bit(HCI_UP, &hdev->flags))
660 skb = create_monitor_event(hdev, HCI_DEV_UP);
661 else if (hci_dev_test_flag(hdev, HCI_SETUP))
662 skb = create_monitor_event(hdev, HCI_DEV_SETUP);
663 else
664 skb = NULL;
665
666 if (skb) {
667 if (sock_queue_rcv_skb(sk, skb))
668 kfree_skb(skb);
669 }
670 }
671
672 read_unlock(&hci_dev_list_lock);
673 }
674
675 static void send_monitor_control_replay(struct sock *mon_sk)
676 {
677 struct sock *sk;
678
679 read_lock(&hci_sk_list.lock);
680
681 sk_for_each(sk, &hci_sk_list.head) {
682 struct sk_buff *skb;
683
684 skb = create_monitor_ctrl_open(sk);
685 if (!skb)
686 continue;
687
688 if (sock_queue_rcv_skb(mon_sk, skb))
689 kfree_skb(skb);
690 }
691
692 read_unlock(&hci_sk_list.lock);
693 }
694
695 /* Generate internal stack event */
696 static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
697 {
698 struct hci_event_hdr *hdr;
699 struct hci_ev_stack_internal *ev;
700 struct sk_buff *skb;
701
702 skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
703 if (!skb)
704 return;
705
706 hdr = (void *)skb_put(skb, HCI_EVENT_HDR_SIZE);
707 hdr->evt = HCI_EV_STACK_INTERNAL;
708 hdr->plen = sizeof(*ev) + dlen;
709
710 ev = (void *)skb_put(skb, sizeof(*ev) + dlen);
711 ev->type = type;
712 memcpy(ev->data, data, dlen);
713
714 bt_cb(skb)->incoming = 1;
715 __net_timestamp(skb);
716
717 hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
718 hci_send_to_sock(hdev, skb);
719 kfree_skb(skb);
720 }
721
722 void hci_sock_dev_event(struct hci_dev *hdev, int event)
723 {
724 BT_DBG("hdev %s event %d", hdev->name, event);
725
726 if (atomic_read(&monitor_promisc)) {
727 struct sk_buff *skb;
728
729 /* Send event to monitor */
730 skb = create_monitor_event(hdev, event);
731 if (skb) {
732 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
733 HCI_SOCK_TRUSTED, NULL);
734 kfree_skb(skb);
735 }
736 }
737
738 if (event <= HCI_DEV_DOWN) {
739 struct hci_ev_si_device ev;
740
741 /* Send event to sockets */
742 ev.event = event;
743 ev.dev_id = hdev->id;
744 hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
745 }
746
747 if (event == HCI_DEV_UNREG) {
748 struct sock *sk;
749
750 /* Detach sockets from device */
751 read_lock(&hci_sk_list.lock);
752 sk_for_each(sk, &hci_sk_list.head) {
753 bh_lock_sock_nested(sk);
754 if (hci_pi(sk)->hdev == hdev) {
755 hci_pi(sk)->hdev = NULL;
756 sk->sk_err = EPIPE;
757 sk->sk_state = BT_OPEN;
758 sk->sk_state_change(sk);
759
760 hci_dev_put(hdev);
761 }
762 bh_unlock_sock(sk);
763 }
764 read_unlock(&hci_sk_list.lock);
765 }
766 }
767
768 static struct hci_mgmt_chan *__hci_mgmt_chan_find(unsigned short channel)
769 {
770 struct hci_mgmt_chan *c;
771
772 list_for_each_entry(c, &mgmt_chan_list, list) {
773 if (c->channel == channel)
774 return c;
775 }
776
777 return NULL;
778 }
779
780 static struct hci_mgmt_chan *hci_mgmt_chan_find(unsigned short channel)
781 {
782 struct hci_mgmt_chan *c;
783
784 mutex_lock(&mgmt_chan_list_lock);
785 c = __hci_mgmt_chan_find(channel);
786 mutex_unlock(&mgmt_chan_list_lock);
787
788 return c;
789 }
790
791 int hci_mgmt_chan_register(struct hci_mgmt_chan *c)
792 {
793 if (c->channel < HCI_CHANNEL_CONTROL)
794 return -EINVAL;
795
796 mutex_lock(&mgmt_chan_list_lock);
797 if (__hci_mgmt_chan_find(c->channel)) {
798 mutex_unlock(&mgmt_chan_list_lock);
799 return -EALREADY;
800 }
801
802 list_add_tail(&c->list, &mgmt_chan_list);
803
804 mutex_unlock(&mgmt_chan_list_lock);
805
806 return 0;
807 }
808 EXPORT_SYMBOL(hci_mgmt_chan_register);
809
810 void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c)
811 {
812 mutex_lock(&mgmt_chan_list_lock);
813 list_del(&c->list);
814 mutex_unlock(&mgmt_chan_list_lock);
815 }
816 EXPORT_SYMBOL(hci_mgmt_chan_unregister);
817
818 static int hci_sock_release(struct socket *sock)
819 {
820 struct sock *sk = sock->sk;
821 struct hci_dev *hdev;
822 struct sk_buff *skb;
823
824 BT_DBG("sock %p sk %p", sock, sk);
825
826 if (!sk)
827 return 0;
828
829 hdev = hci_pi(sk)->hdev;
830
831 switch (hci_pi(sk)->channel) {
832 case HCI_CHANNEL_MONITOR:
833 atomic_dec(&monitor_promisc);
834 break;
835 case HCI_CHANNEL_RAW:
836 case HCI_CHANNEL_USER:
837 case HCI_CHANNEL_CONTROL:
838 /* Send event to monitor */
839 skb = create_monitor_ctrl_close(sk);
840 if (skb) {
841 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
842 HCI_SOCK_TRUSTED, NULL);
843 kfree_skb(skb);
844 }
845
846 hci_sock_free_cookie(sk);
847 break;
848 }
849
850 bt_sock_unlink(&hci_sk_list, sk);
851
852 if (hdev) {
853 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
854 /* When releasing an user channel exclusive access,
855 * call hci_dev_do_close directly instead of calling
856 * hci_dev_close to ensure the exclusive access will
857 * be released and the controller brought back down.
858 *
859 * The checking of HCI_AUTO_OFF is not needed in this
860 * case since it will have been cleared already when
861 * opening the user channel.
862 */
863 hci_dev_do_close(hdev);
864 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
865 mgmt_index_added(hdev);
866 }
867
868 atomic_dec(&hdev->promisc);
869 hci_dev_put(hdev);
870 }
871
872 sock_orphan(sk);
873
874 skb_queue_purge(&sk->sk_receive_queue);
875 skb_queue_purge(&sk->sk_write_queue);
876
877 sock_put(sk);
878 return 0;
879 }
880
881 static int hci_sock_blacklist_add(struct hci_dev *hdev, void __user *arg)
882 {
883 bdaddr_t bdaddr;
884 int err;
885
886 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
887 return -EFAULT;
888
889 hci_dev_lock(hdev);
890
891 err = hci_bdaddr_list_add(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
892
893 hci_dev_unlock(hdev);
894
895 return err;
896 }
897
898 static int hci_sock_blacklist_del(struct hci_dev *hdev, void __user *arg)
899 {
900 bdaddr_t bdaddr;
901 int err;
902
903 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
904 return -EFAULT;
905
906 hci_dev_lock(hdev);
907
908 err = hci_bdaddr_list_del(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
909
910 hci_dev_unlock(hdev);
911
912 return err;
913 }
914
915 /* Ioctls that require bound socket */
916 static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
917 unsigned long arg)
918 {
919 struct hci_dev *hdev = hci_pi(sk)->hdev;
920
921 if (!hdev)
922 return -EBADFD;
923
924 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
925 return -EBUSY;
926
927 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
928 return -EOPNOTSUPP;
929
930 if (hdev->dev_type != HCI_PRIMARY)
931 return -EOPNOTSUPP;
932
933 switch (cmd) {
934 case HCISETRAW:
935 if (!capable(CAP_NET_ADMIN))
936 return -EPERM;
937 return -EOPNOTSUPP;
938
939 case HCIGETCONNINFO:
940 return hci_get_conn_info(hdev, (void __user *)arg);
941
942 case HCIGETAUTHINFO:
943 return hci_get_auth_info(hdev, (void __user *)arg);
944
945 case HCIBLOCKADDR:
946 if (!capable(CAP_NET_ADMIN))
947 return -EPERM;
948 return hci_sock_blacklist_add(hdev, (void __user *)arg);
949
950 case HCIUNBLOCKADDR:
951 if (!capable(CAP_NET_ADMIN))
952 return -EPERM;
953 return hci_sock_blacklist_del(hdev, (void __user *)arg);
954 }
955
956 return -ENOIOCTLCMD;
957 }
958
959 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
960 unsigned long arg)
961 {
962 void __user *argp = (void __user *)arg;
963 struct sock *sk = sock->sk;
964 int err;
965
966 BT_DBG("cmd %x arg %lx", cmd, arg);
967
968 lock_sock(sk);
969
970 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
971 err = -EBADFD;
972 goto done;
973 }
974
975 /* When calling an ioctl on an unbound raw socket, then ensure
976 * that the monitor gets informed. Ensure that the resulting event
977 * is only send once by checking if the cookie exists or not. The
978 * socket cookie will be only ever generated once for the lifetime
979 * of a given socket.
980 */
981 if (hci_sock_gen_cookie(sk)) {
982 struct sk_buff *skb;
983
984 if (capable(CAP_NET_ADMIN))
985 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
986
987 /* Send event to monitor */
988 skb = create_monitor_ctrl_open(sk);
989 if (skb) {
990 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
991 HCI_SOCK_TRUSTED, NULL);
992 kfree_skb(skb);
993 }
994 }
995
996 release_sock(sk);
997
998 switch (cmd) {
999 case HCIGETDEVLIST:
1000 return hci_get_dev_list(argp);
1001
1002 case HCIGETDEVINFO:
1003 return hci_get_dev_info(argp);
1004
1005 case HCIGETCONNLIST:
1006 return hci_get_conn_list(argp);
1007
1008 case HCIDEVUP:
1009 if (!capable(CAP_NET_ADMIN))
1010 return -EPERM;
1011 return hci_dev_open(arg);
1012
1013 case HCIDEVDOWN:
1014 if (!capable(CAP_NET_ADMIN))
1015 return -EPERM;
1016 return hci_dev_close(arg);
1017
1018 case HCIDEVRESET:
1019 if (!capable(CAP_NET_ADMIN))
1020 return -EPERM;
1021 return hci_dev_reset(arg);
1022
1023 case HCIDEVRESTAT:
1024 if (!capable(CAP_NET_ADMIN))
1025 return -EPERM;
1026 return hci_dev_reset_stat(arg);
1027
1028 case HCISETSCAN:
1029 case HCISETAUTH:
1030 case HCISETENCRYPT:
1031 case HCISETPTYPE:
1032 case HCISETLINKPOL:
1033 case HCISETLINKMODE:
1034 case HCISETACLMTU:
1035 case HCISETSCOMTU:
1036 if (!capable(CAP_NET_ADMIN))
1037 return -EPERM;
1038 return hci_dev_cmd(cmd, argp);
1039
1040 case HCIINQUIRY:
1041 return hci_inquiry(argp);
1042 }
1043
1044 lock_sock(sk);
1045
1046 err = hci_sock_bound_ioctl(sk, cmd, arg);
1047
1048 done:
1049 release_sock(sk);
1050 return err;
1051 }
1052
1053 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
1054 int addr_len)
1055 {
1056 struct sockaddr_hci haddr;
1057 struct sock *sk = sock->sk;
1058 struct hci_dev *hdev = NULL;
1059 struct sk_buff *skb;
1060 int len, err = 0;
1061
1062 BT_DBG("sock %p sk %p", sock, sk);
1063
1064 if (!addr)
1065 return -EINVAL;
1066
1067 memset(&haddr, 0, sizeof(haddr));
1068 len = min_t(unsigned int, sizeof(haddr), addr_len);
1069 memcpy(&haddr, addr, len);
1070
1071 if (haddr.hci_family != AF_BLUETOOTH)
1072 return -EINVAL;
1073
1074 lock_sock(sk);
1075
1076 if (sk->sk_state == BT_BOUND) {
1077 err = -EALREADY;
1078 goto done;
1079 }
1080
1081 switch (haddr.hci_channel) {
1082 case HCI_CHANNEL_RAW:
1083 if (hci_pi(sk)->hdev) {
1084 err = -EALREADY;
1085 goto done;
1086 }
1087
1088 if (haddr.hci_dev != HCI_DEV_NONE) {
1089 hdev = hci_dev_get(haddr.hci_dev);
1090 if (!hdev) {
1091 err = -ENODEV;
1092 goto done;
1093 }
1094
1095 atomic_inc(&hdev->promisc);
1096 }
1097
1098 hci_pi(sk)->channel = haddr.hci_channel;
1099
1100 if (!hci_sock_gen_cookie(sk)) {
1101 /* In the case when a cookie has already been assigned,
1102 * then there has been already an ioctl issued against
1103 * an unbound socket and with that triggerd an open
1104 * notification. Send a close notification first to
1105 * allow the state transition to bounded.
1106 */
1107 skb = create_monitor_ctrl_close(sk);
1108 if (skb) {
1109 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1110 HCI_SOCK_TRUSTED, NULL);
1111 kfree_skb(skb);
1112 }
1113 }
1114
1115 if (capable(CAP_NET_ADMIN))
1116 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1117
1118 hci_pi(sk)->hdev = hdev;
1119
1120 /* Send event to monitor */
1121 skb = create_monitor_ctrl_open(sk);
1122 if (skb) {
1123 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1124 HCI_SOCK_TRUSTED, NULL);
1125 kfree_skb(skb);
1126 }
1127 break;
1128
1129 case HCI_CHANNEL_USER:
1130 if (hci_pi(sk)->hdev) {
1131 err = -EALREADY;
1132 goto done;
1133 }
1134
1135 if (haddr.hci_dev == HCI_DEV_NONE) {
1136 err = -EINVAL;
1137 goto done;
1138 }
1139
1140 if (!capable(CAP_NET_ADMIN)) {
1141 err = -EPERM;
1142 goto done;
1143 }
1144
1145 hdev = hci_dev_get(haddr.hci_dev);
1146 if (!hdev) {
1147 err = -ENODEV;
1148 goto done;
1149 }
1150
1151 if (test_bit(HCI_INIT, &hdev->flags) ||
1152 hci_dev_test_flag(hdev, HCI_SETUP) ||
1153 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1154 (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) &&
1155 test_bit(HCI_UP, &hdev->flags))) {
1156 err = -EBUSY;
1157 hci_dev_put(hdev);
1158 goto done;
1159 }
1160
1161 if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) {
1162 err = -EUSERS;
1163 hci_dev_put(hdev);
1164 goto done;
1165 }
1166
1167 mgmt_index_removed(hdev);
1168
1169 err = hci_dev_open(hdev->id);
1170 if (err) {
1171 if (err == -EALREADY) {
1172 /* In case the transport is already up and
1173 * running, clear the error here.
1174 *
1175 * This can happen when opening an user
1176 * channel and HCI_AUTO_OFF grace period
1177 * is still active.
1178 */
1179 err = 0;
1180 } else {
1181 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
1182 mgmt_index_added(hdev);
1183 hci_dev_put(hdev);
1184 goto done;
1185 }
1186 }
1187
1188 hci_pi(sk)->channel = haddr.hci_channel;
1189
1190 if (!hci_sock_gen_cookie(sk)) {
1191 /* In the case when a cookie has already been assigned,
1192 * this socket will transition from a raw socket into
1193 * an user channel socket. For a clean transition, send
1194 * the close notification first.
1195 */
1196 skb = create_monitor_ctrl_close(sk);
1197 if (skb) {
1198 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1199 HCI_SOCK_TRUSTED, NULL);
1200 kfree_skb(skb);
1201 }
1202 }
1203
1204 /* The user channel is restricted to CAP_NET_ADMIN
1205 * capabilities and with that implicitly trusted.
1206 */
1207 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1208
1209 hci_pi(sk)->hdev = hdev;
1210
1211 /* Send event to monitor */
1212 skb = create_monitor_ctrl_open(sk);
1213 if (skb) {
1214 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1215 HCI_SOCK_TRUSTED, NULL);
1216 kfree_skb(skb);
1217 }
1218
1219 atomic_inc(&hdev->promisc);
1220 break;
1221
1222 case HCI_CHANNEL_MONITOR:
1223 if (haddr.hci_dev != HCI_DEV_NONE) {
1224 err = -EINVAL;
1225 goto done;
1226 }
1227
1228 if (!capable(CAP_NET_RAW)) {
1229 err = -EPERM;
1230 goto done;
1231 }
1232
1233 hci_pi(sk)->channel = haddr.hci_channel;
1234
1235 /* The monitor interface is restricted to CAP_NET_RAW
1236 * capabilities and with that implicitly trusted.
1237 */
1238 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1239
1240 send_monitor_note(sk, "Linux version %s (%s)",
1241 init_utsname()->release,
1242 init_utsname()->machine);
1243 send_monitor_note(sk, "Bluetooth subsystem version %u.%u",
1244 BT_SUBSYS_VERSION, BT_SUBSYS_REVISION);
1245 send_monitor_replay(sk);
1246 send_monitor_control_replay(sk);
1247
1248 atomic_inc(&monitor_promisc);
1249 break;
1250
1251 case HCI_CHANNEL_LOGGING:
1252 if (haddr.hci_dev != HCI_DEV_NONE) {
1253 err = -EINVAL;
1254 goto done;
1255 }
1256
1257 if (!capable(CAP_NET_ADMIN)) {
1258 err = -EPERM;
1259 goto done;
1260 }
1261
1262 hci_pi(sk)->channel = haddr.hci_channel;
1263 break;
1264
1265 default:
1266 if (!hci_mgmt_chan_find(haddr.hci_channel)) {
1267 err = -EINVAL;
1268 goto done;
1269 }
1270
1271 if (haddr.hci_dev != HCI_DEV_NONE) {
1272 err = -EINVAL;
1273 goto done;
1274 }
1275
1276 /* Users with CAP_NET_ADMIN capabilities are allowed
1277 * access to all management commands and events. For
1278 * untrusted users the interface is restricted and
1279 * also only untrusted events are sent.
1280 */
1281 if (capable(CAP_NET_ADMIN))
1282 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1283
1284 hci_pi(sk)->channel = haddr.hci_channel;
1285
1286 /* At the moment the index and unconfigured index events
1287 * are enabled unconditionally. Setting them on each
1288 * socket when binding keeps this functionality. They
1289 * however might be cleared later and then sending of these
1290 * events will be disabled, but that is then intentional.
1291 *
1292 * This also enables generic events that are safe to be
1293 * received by untrusted users. Example for such events
1294 * are changes to settings, class of device, name etc.
1295 */
1296 if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) {
1297 if (!hci_sock_gen_cookie(sk)) {
1298 /* In the case when a cookie has already been
1299 * assigned, this socket will transtion from
1300 * a raw socket into a control socket. To
1301 * allow for a clean transtion, send the
1302 * close notification first.
1303 */
1304 skb = create_monitor_ctrl_close(sk);
1305 if (skb) {
1306 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1307 HCI_SOCK_TRUSTED, NULL);
1308 kfree_skb(skb);
1309 }
1310 }
1311
1312 /* Send event to monitor */
1313 skb = create_monitor_ctrl_open(sk);
1314 if (skb) {
1315 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1316 HCI_SOCK_TRUSTED, NULL);
1317 kfree_skb(skb);
1318 }
1319
1320 hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS);
1321 hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);
1322 hci_sock_set_flag(sk, HCI_MGMT_OPTION_EVENTS);
1323 hci_sock_set_flag(sk, HCI_MGMT_SETTING_EVENTS);
1324 hci_sock_set_flag(sk, HCI_MGMT_DEV_CLASS_EVENTS);
1325 hci_sock_set_flag(sk, HCI_MGMT_LOCAL_NAME_EVENTS);
1326 }
1327 break;
1328 }
1329
1330 sk->sk_state = BT_BOUND;
1331
1332 done:
1333 release_sock(sk);
1334 return err;
1335 }
1336
1337 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
1338 int *addr_len, int peer)
1339 {
1340 struct sockaddr_hci *haddr = (struct sockaddr_hci *)addr;
1341 struct sock *sk = sock->sk;
1342 struct hci_dev *hdev;
1343 int err = 0;
1344
1345 BT_DBG("sock %p sk %p", sock, sk);
1346
1347 if (peer)
1348 return -EOPNOTSUPP;
1349
1350 lock_sock(sk);
1351
1352 hdev = hci_pi(sk)->hdev;
1353 if (!hdev) {
1354 err = -EBADFD;
1355 goto done;
1356 }
1357
1358 *addr_len = sizeof(*haddr);
1359 haddr->hci_family = AF_BLUETOOTH;
1360 haddr->hci_dev = hdev->id;
1361 haddr->hci_channel= hci_pi(sk)->channel;
1362
1363 done:
1364 release_sock(sk);
1365 return err;
1366 }
1367
1368 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
1369 struct sk_buff *skb)
1370 {
1371 __u32 mask = hci_pi(sk)->cmsg_mask;
1372
1373 if (mask & HCI_CMSG_DIR) {
1374 int incoming = bt_cb(skb)->incoming;
1375 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
1376 &incoming);
1377 }
1378
1379 if (mask & HCI_CMSG_TSTAMP) {
1380 #ifdef CONFIG_COMPAT
1381 struct compat_timeval ctv;
1382 #endif
1383 struct timeval tv;
1384 void *data;
1385 int len;
1386
1387 skb_get_timestamp(skb, &tv);
1388
1389 data = &tv;
1390 len = sizeof(tv);
1391 #ifdef CONFIG_COMPAT
1392 if (!COMPAT_USE_64BIT_TIME &&
1393 (msg->msg_flags & MSG_CMSG_COMPAT)) {
1394 ctv.tv_sec = tv.tv_sec;
1395 ctv.tv_usec = tv.tv_usec;
1396 data = &ctv;
1397 len = sizeof(ctv);
1398 }
1399 #endif
1400
1401 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
1402 }
1403 }
1404
1405 static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1406 size_t len, int flags)
1407 {
1408 int noblock = flags & MSG_DONTWAIT;
1409 struct sock *sk = sock->sk;
1410 struct sk_buff *skb;
1411 int copied, err;
1412 unsigned int skblen;
1413
1414 BT_DBG("sock %p, sk %p", sock, sk);
1415
1416 if (flags & MSG_OOB)
1417 return -EOPNOTSUPP;
1418
1419 if (hci_pi(sk)->channel == HCI_CHANNEL_LOGGING)
1420 return -EOPNOTSUPP;
1421
1422 if (sk->sk_state == BT_CLOSED)
1423 return 0;
1424
1425 skb = skb_recv_datagram(sk, flags, noblock, &err);
1426 if (!skb)
1427 return err;
1428
1429 skblen = skb->len;
1430 copied = skb->len;
1431 if (len < copied) {
1432 msg->msg_flags |= MSG_TRUNC;
1433 copied = len;
1434 }
1435
1436 skb_reset_transport_header(skb);
1437 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1438
1439 switch (hci_pi(sk)->channel) {
1440 case HCI_CHANNEL_RAW:
1441 hci_sock_cmsg(sk, msg, skb);
1442 break;
1443 case HCI_CHANNEL_USER:
1444 case HCI_CHANNEL_MONITOR:
1445 sock_recv_timestamp(msg, sk, skb);
1446 break;
1447 default:
1448 if (hci_mgmt_chan_find(hci_pi(sk)->channel))
1449 sock_recv_timestamp(msg, sk, skb);
1450 break;
1451 }
1452
1453 skb_free_datagram(sk, skb);
1454
1455 if (flags & MSG_TRUNC)
1456 copied = skblen;
1457
1458 return err ? : copied;
1459 }
1460
1461 static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
1462 struct msghdr *msg, size_t msglen)
1463 {
1464 void *buf;
1465 u8 *cp;
1466 struct mgmt_hdr *hdr;
1467 u16 opcode, index, len;
1468 struct hci_dev *hdev = NULL;
1469 const struct hci_mgmt_handler *handler;
1470 bool var_len, no_hdev;
1471 int err;
1472
1473 BT_DBG("got %zu bytes", msglen);
1474
1475 if (msglen < sizeof(*hdr))
1476 return -EINVAL;
1477
1478 buf = kmalloc(msglen, GFP_KERNEL);
1479 if (!buf)
1480 return -ENOMEM;
1481
1482 if (memcpy_from_msg(buf, msg, msglen)) {
1483 err = -EFAULT;
1484 goto done;
1485 }
1486
1487 hdr = buf;
1488 opcode = __le16_to_cpu(hdr->opcode);
1489 index = __le16_to_cpu(hdr->index);
1490 len = __le16_to_cpu(hdr->len);
1491
1492 if (len != msglen - sizeof(*hdr)) {
1493 err = -EINVAL;
1494 goto done;
1495 }
1496
1497 if (chan->channel == HCI_CHANNEL_CONTROL) {
1498 struct sk_buff *skb;
1499
1500 /* Send event to monitor */
1501 skb = create_monitor_ctrl_command(sk, index, opcode, len,
1502 buf + sizeof(*hdr));
1503 if (skb) {
1504 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1505 HCI_SOCK_TRUSTED, NULL);
1506 kfree_skb(skb);
1507 }
1508 }
1509
1510 if (opcode >= chan->handler_count ||
1511 chan->handlers[opcode].func == NULL) {
1512 BT_DBG("Unknown op %u", opcode);
1513 err = mgmt_cmd_status(sk, index, opcode,
1514 MGMT_STATUS_UNKNOWN_COMMAND);
1515 goto done;
1516 }
1517
1518 handler = &chan->handlers[opcode];
1519
1520 if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
1521 !(handler->flags & HCI_MGMT_UNTRUSTED)) {
1522 err = mgmt_cmd_status(sk, index, opcode,
1523 MGMT_STATUS_PERMISSION_DENIED);
1524 goto done;
1525 }
1526
1527 if (index != MGMT_INDEX_NONE) {
1528 hdev = hci_dev_get(index);
1529 if (!hdev) {
1530 err = mgmt_cmd_status(sk, index, opcode,
1531 MGMT_STATUS_INVALID_INDEX);
1532 goto done;
1533 }
1534
1535 if (hci_dev_test_flag(hdev, HCI_SETUP) ||
1536 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1537 hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1538 err = mgmt_cmd_status(sk, index, opcode,
1539 MGMT_STATUS_INVALID_INDEX);
1540 goto done;
1541 }
1542
1543 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1544 !(handler->flags & HCI_MGMT_UNCONFIGURED)) {
1545 err = mgmt_cmd_status(sk, index, opcode,
1546 MGMT_STATUS_INVALID_INDEX);
1547 goto done;
1548 }
1549 }
1550
1551 no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
1552 if (no_hdev != !hdev) {
1553 err = mgmt_cmd_status(sk, index, opcode,
1554 MGMT_STATUS_INVALID_INDEX);
1555 goto done;
1556 }
1557
1558 var_len = (handler->flags & HCI_MGMT_VAR_LEN);
1559 if ((var_len && len < handler->data_len) ||
1560 (!var_len && len != handler->data_len)) {
1561 err = mgmt_cmd_status(sk, index, opcode,
1562 MGMT_STATUS_INVALID_PARAMS);
1563 goto done;
1564 }
1565
1566 if (hdev && chan->hdev_init)
1567 chan->hdev_init(sk, hdev);
1568
1569 cp = buf + sizeof(*hdr);
1570
1571 err = handler->func(sk, hdev, cp, len);
1572 if (err < 0)
1573 goto done;
1574
1575 err = msglen;
1576
1577 done:
1578 if (hdev)
1579 hci_dev_put(hdev);
1580
1581 kfree(buf);
1582 return err;
1583 }
1584
1585 static int hci_logging_frame(struct sock *sk, struct msghdr *msg, int len)
1586 {
1587 struct hci_mon_hdr *hdr;
1588 struct sk_buff *skb;
1589 struct hci_dev *hdev;
1590 u16 index;
1591 int err;
1592
1593 /* The logging frame consists at minimum of the standard header,
1594 * the priority byte, the ident length byte and at least one string
1595 * terminator NUL byte. Anything shorter are invalid packets.
1596 */
1597 if (len < sizeof(*hdr) + 3)
1598 return -EINVAL;
1599
1600 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1601 if (!skb)
1602 return err;
1603
1604 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1605 err = -EFAULT;
1606 goto drop;
1607 }
1608
1609 hdr = (void *)skb->data;
1610
1611 if (__le16_to_cpu(hdr->len) != len - sizeof(*hdr)) {
1612 err = -EINVAL;
1613 goto drop;
1614 }
1615
1616 if (__le16_to_cpu(hdr->opcode) == 0x0000) {
1617 __u8 priority = skb->data[sizeof(*hdr)];
1618 __u8 ident_len = skb->data[sizeof(*hdr) + 1];
1619
1620 /* Only the priorities 0-7 are valid and with that any other
1621 * value results in an invalid packet.
1622 *
1623 * The priority byte is followed by an ident length byte and
1624 * the NUL terminated ident string. Check that the ident
1625 * length is not overflowing the packet and also that the
1626 * ident string itself is NUL terminated. In case the ident
1627 * length is zero, the length value actually doubles as NUL
1628 * terminator identifier.
1629 *
1630 * The message follows the ident string (if present) and
1631 * must be NUL terminated. Otherwise it is not a valid packet.
1632 */
1633 if (priority > 7 || skb->data[len - 1] != 0x00 ||
1634 ident_len > len - sizeof(*hdr) - 3 ||
1635 skb->data[sizeof(*hdr) + ident_len + 1] != 0x00) {
1636 err = -EINVAL;
1637 goto drop;
1638 }
1639 } else {
1640 err = -EINVAL;
1641 goto drop;
1642 }
1643
1644 index = __le16_to_cpu(hdr->index);
1645
1646 if (index != MGMT_INDEX_NONE) {
1647 hdev = hci_dev_get(index);
1648 if (!hdev) {
1649 err = -ENODEV;
1650 goto drop;
1651 }
1652 } else {
1653 hdev = NULL;
1654 }
1655
1656 hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING);
1657
1658 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL);
1659 err = len;
1660
1661 if (hdev)
1662 hci_dev_put(hdev);
1663
1664 drop:
1665 kfree_skb(skb);
1666 return err;
1667 }
1668
1669 static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1670 size_t len)
1671 {
1672 struct sock *sk = sock->sk;
1673 struct hci_mgmt_chan *chan;
1674 struct hci_dev *hdev;
1675 struct sk_buff *skb;
1676 int err;
1677
1678 BT_DBG("sock %p sk %p", sock, sk);
1679
1680 if (msg->msg_flags & MSG_OOB)
1681 return -EOPNOTSUPP;
1682
1683 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
1684 return -EINVAL;
1685
1686 if (len < 4 || len > HCI_MAX_FRAME_SIZE)
1687 return -EINVAL;
1688
1689 lock_sock(sk);
1690
1691 switch (hci_pi(sk)->channel) {
1692 case HCI_CHANNEL_RAW:
1693 case HCI_CHANNEL_USER:
1694 break;
1695 case HCI_CHANNEL_MONITOR:
1696 err = -EOPNOTSUPP;
1697 goto done;
1698 case HCI_CHANNEL_LOGGING:
1699 err = hci_logging_frame(sk, msg, len);
1700 goto done;
1701 default:
1702 mutex_lock(&mgmt_chan_list_lock);
1703 chan = __hci_mgmt_chan_find(hci_pi(sk)->channel);
1704 if (chan)
1705 err = hci_mgmt_cmd(chan, sk, msg, len);
1706 else
1707 err = -EINVAL;
1708
1709 mutex_unlock(&mgmt_chan_list_lock);
1710 goto done;
1711 }
1712
1713 hdev = hci_pi(sk)->hdev;
1714 if (!hdev) {
1715 err = -EBADFD;
1716 goto done;
1717 }
1718
1719 if (!test_bit(HCI_UP, &hdev->flags)) {
1720 err = -ENETDOWN;
1721 goto done;
1722 }
1723
1724 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1725 if (!skb)
1726 goto done;
1727
1728 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1729 err = -EFAULT;
1730 goto drop;
1731 }
1732
1733 hci_skb_pkt_type(skb) = skb->data[0];
1734 skb_pull(skb, 1);
1735
1736 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
1737 /* No permission check is needed for user channel
1738 * since that gets enforced when binding the socket.
1739 *
1740 * However check that the packet type is valid.
1741 */
1742 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
1743 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1744 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT) {
1745 err = -EINVAL;
1746 goto drop;
1747 }
1748
1749 skb_queue_tail(&hdev->raw_q, skb);
1750 queue_work(hdev->workqueue, &hdev->tx_work);
1751 } else if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
1752 u16 opcode = get_unaligned_le16(skb->data);
1753 u16 ogf = hci_opcode_ogf(opcode);
1754 u16 ocf = hci_opcode_ocf(opcode);
1755
1756 if (((ogf > HCI_SFLT_MAX_OGF) ||
1757 !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
1758 &hci_sec_filter.ocf_mask[ogf])) &&
1759 !capable(CAP_NET_RAW)) {
1760 err = -EPERM;
1761 goto drop;
1762 }
1763
1764 /* Since the opcode has already been extracted here, store
1765 * a copy of the value for later use by the drivers.
1766 */
1767 hci_skb_opcode(skb) = opcode;
1768
1769 if (ogf == 0x3f) {
1770 skb_queue_tail(&hdev->raw_q, skb);
1771 queue_work(hdev->workqueue, &hdev->tx_work);
1772 } else {
1773 /* Stand-alone HCI commands must be flagged as
1774 * single-command requests.
1775 */
1776 bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
1777
1778 skb_queue_tail(&hdev->cmd_q, skb);
1779 queue_work(hdev->workqueue, &hdev->cmd_work);
1780 }
1781 } else {
1782 if (!capable(CAP_NET_RAW)) {
1783 err = -EPERM;
1784 goto drop;
1785 }
1786
1787 if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1788 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT) {
1789 err = -EINVAL;
1790 goto drop;
1791 }
1792
1793 skb_queue_tail(&hdev->raw_q, skb);
1794 queue_work(hdev->workqueue, &hdev->tx_work);
1795 }
1796
1797 err = len;
1798
1799 done:
1800 release_sock(sk);
1801 return err;
1802
1803 drop:
1804 kfree_skb(skb);
1805 goto done;
1806 }
1807
1808 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1809 char __user *optval, unsigned int len)
1810 {
1811 struct hci_ufilter uf = { .opcode = 0 };
1812 struct sock *sk = sock->sk;
1813 int err = 0, opt = 0;
1814
1815 BT_DBG("sk %p, opt %d", sk, optname);
1816
1817 if (level != SOL_HCI)
1818 return -ENOPROTOOPT;
1819
1820 lock_sock(sk);
1821
1822 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1823 err = -EBADFD;
1824 goto done;
1825 }
1826
1827 switch (optname) {
1828 case HCI_DATA_DIR:
1829 if (get_user(opt, (int __user *)optval)) {
1830 err = -EFAULT;
1831 break;
1832 }
1833
1834 if (opt)
1835 hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1836 else
1837 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1838 break;
1839
1840 case HCI_TIME_STAMP:
1841 if (get_user(opt, (int __user *)optval)) {
1842 err = -EFAULT;
1843 break;
1844 }
1845
1846 if (opt)
1847 hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1848 else
1849 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1850 break;
1851
1852 case HCI_FILTER:
1853 {
1854 struct hci_filter *f = &hci_pi(sk)->filter;
1855
1856 uf.type_mask = f->type_mask;
1857 uf.opcode = f->opcode;
1858 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1859 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1860 }
1861
1862 len = min_t(unsigned int, len, sizeof(uf));
1863 if (copy_from_user(&uf, optval, len)) {
1864 err = -EFAULT;
1865 break;
1866 }
1867
1868 if (!capable(CAP_NET_RAW)) {
1869 uf.type_mask &= hci_sec_filter.type_mask;
1870 uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1871 uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1872 }
1873
1874 {
1875 struct hci_filter *f = &hci_pi(sk)->filter;
1876
1877 f->type_mask = uf.type_mask;
1878 f->opcode = uf.opcode;
1879 *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1880 *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1881 }
1882 break;
1883
1884 default:
1885 err = -ENOPROTOOPT;
1886 break;
1887 }
1888
1889 done:
1890 release_sock(sk);
1891 return err;
1892 }
1893
1894 static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
1895 char __user *optval, int __user *optlen)
1896 {
1897 struct hci_ufilter uf;
1898 struct sock *sk = sock->sk;
1899 int len, opt, err = 0;
1900
1901 BT_DBG("sk %p, opt %d", sk, optname);
1902
1903 if (level != SOL_HCI)
1904 return -ENOPROTOOPT;
1905
1906 if (get_user(len, optlen))
1907 return -EFAULT;
1908
1909 lock_sock(sk);
1910
1911 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1912 err = -EBADFD;
1913 goto done;
1914 }
1915
1916 switch (optname) {
1917 case HCI_DATA_DIR:
1918 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1919 opt = 1;
1920 else
1921 opt = 0;
1922
1923 if (put_user(opt, optval))
1924 err = -EFAULT;
1925 break;
1926
1927 case HCI_TIME_STAMP:
1928 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1929 opt = 1;
1930 else
1931 opt = 0;
1932
1933 if (put_user(opt, optval))
1934 err = -EFAULT;
1935 break;
1936
1937 case HCI_FILTER:
1938 {
1939 struct hci_filter *f = &hci_pi(sk)->filter;
1940
1941 memset(&uf, 0, sizeof(uf));
1942 uf.type_mask = f->type_mask;
1943 uf.opcode = f->opcode;
1944 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1945 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1946 }
1947
1948 len = min_t(unsigned int, len, sizeof(uf));
1949 if (copy_to_user(optval, &uf, len))
1950 err = -EFAULT;
1951 break;
1952
1953 default:
1954 err = -ENOPROTOOPT;
1955 break;
1956 }
1957
1958 done:
1959 release_sock(sk);
1960 return err;
1961 }
1962
1963 static const struct proto_ops hci_sock_ops = {
1964 .family = PF_BLUETOOTH,
1965 .owner = THIS_MODULE,
1966 .release = hci_sock_release,
1967 .bind = hci_sock_bind,
1968 .getname = hci_sock_getname,
1969 .sendmsg = hci_sock_sendmsg,
1970 .recvmsg = hci_sock_recvmsg,
1971 .ioctl = hci_sock_ioctl,
1972 .poll = datagram_poll,
1973 .listen = sock_no_listen,
1974 .shutdown = sock_no_shutdown,
1975 .setsockopt = hci_sock_setsockopt,
1976 .getsockopt = hci_sock_getsockopt,
1977 .connect = sock_no_connect,
1978 .socketpair = sock_no_socketpair,
1979 .accept = sock_no_accept,
1980 .mmap = sock_no_mmap
1981 };
1982
1983 static struct proto hci_sk_proto = {
1984 .name = "HCI",
1985 .owner = THIS_MODULE,
1986 .obj_size = sizeof(struct hci_pinfo)
1987 };
1988
1989 static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
1990 int kern)
1991 {
1992 struct sock *sk;
1993
1994 BT_DBG("sock %p", sock);
1995
1996 if (sock->type != SOCK_RAW)
1997 return -ESOCKTNOSUPPORT;
1998
1999 sock->ops = &hci_sock_ops;
2000
2001 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, kern);
2002 if (!sk)
2003 return -ENOMEM;
2004
2005 sock_init_data(sock, sk);
2006
2007 sock_reset_flag(sk, SOCK_ZAPPED);
2008
2009 sk->sk_protocol = protocol;
2010
2011 sock->state = SS_UNCONNECTED;
2012 sk->sk_state = BT_OPEN;
2013
2014 bt_sock_link(&hci_sk_list, sk);
2015 return 0;
2016 }
2017
2018 static const struct net_proto_family hci_sock_family_ops = {
2019 .family = PF_BLUETOOTH,
2020 .owner = THIS_MODULE,
2021 .create = hci_sock_create,
2022 };
2023
2024 int __init hci_sock_init(void)
2025 {
2026 int err;
2027
2028 BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr));
2029
2030 err = proto_register(&hci_sk_proto, 0);
2031 if (err < 0)
2032 return err;
2033
2034 err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
2035 if (err < 0) {
2036 BT_ERR("HCI socket registration failed");
2037 goto error;
2038 }
2039
2040 err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
2041 if (err < 0) {
2042 BT_ERR("Failed to create HCI proc file");
2043 bt_sock_unregister(BTPROTO_HCI);
2044 goto error;
2045 }
2046
2047 BT_INFO("HCI socket layer initialized");
2048
2049 return 0;
2050
2051 error:
2052 proto_unregister(&hci_sk_proto);
2053 return err;
2054 }
2055
2056 void hci_sock_cleanup(void)
2057 {
2058 bt_procfs_cleanup(&init_net, "hci");
2059 bt_sock_unregister(BTPROTO_HCI);
2060 proto_unregister(&hci_sk_proto);
2061 }
Linux kernel - Deliverables
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