]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/bluetooth/hci_sock.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
s390/speculation: Support 'mitigations=' cmdline option
[mirror_ubuntu-bionic-kernel.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 static 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
288 void 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 */
297 void 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
350 void 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
404 static 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
483 static 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
541 static 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
579 static 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
606 static void __printf(2, 3)
607 send_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
638 static 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
680 static 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 */
701 static 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
727 void 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
773 static 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
785 static 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
796 int 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 }
813 EXPORT_SYMBOL(hci_mgmt_chan_register);
814
815 void 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 }
821 EXPORT_SYMBOL(hci_mgmt_chan_unregister);
822
823 static 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 hdev = hci_pi(sk)->hdev;
835
836 switch (hci_pi(sk)->channel) {
837 case HCI_CHANNEL_MONITOR:
838 atomic_dec(&monitor_promisc);
839 break;
840 case HCI_CHANNEL_RAW:
841 case HCI_CHANNEL_USER:
842 case HCI_CHANNEL_CONTROL:
843 /* Send event to monitor */
844 skb = create_monitor_ctrl_close(sk);
845 if (skb) {
846 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
847 HCI_SOCK_TRUSTED, NULL);
848 kfree_skb(skb);
849 }
850
851 hci_sock_free_cookie(sk);
852 break;
853 }
854
855 bt_sock_unlink(&hci_sk_list, sk);
856
857 if (hdev) {
858 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
859 /* When releasing a user channel exclusive access,
860 * call hci_dev_do_close directly instead of calling
861 * hci_dev_close to ensure the exclusive access will
862 * be released and the controller brought back down.
863 *
864 * The checking of HCI_AUTO_OFF is not needed in this
865 * case since it will have been cleared already when
866 * opening the user channel.
867 */
868 hci_dev_do_close(hdev);
869 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
870 mgmt_index_added(hdev);
871 }
872
873 atomic_dec(&hdev->promisc);
874 hci_dev_put(hdev);
875 }
876
877 sock_orphan(sk);
878
879 skb_queue_purge(&sk->sk_receive_queue);
880 skb_queue_purge(&sk->sk_write_queue);
881
882 sock_put(sk);
883 return 0;
884 }
885
886 static int hci_sock_blacklist_add(struct hci_dev *hdev, void __user *arg)
887 {
888 bdaddr_t bdaddr;
889 int err;
890
891 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
892 return -EFAULT;
893
894 hci_dev_lock(hdev);
895
896 err = hci_bdaddr_list_add(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
897
898 hci_dev_unlock(hdev);
899
900 return err;
901 }
902
903 static int hci_sock_blacklist_del(struct hci_dev *hdev, void __user *arg)
904 {
905 bdaddr_t bdaddr;
906 int err;
907
908 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
909 return -EFAULT;
910
911 hci_dev_lock(hdev);
912
913 err = hci_bdaddr_list_del(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
914
915 hci_dev_unlock(hdev);
916
917 return err;
918 }
919
920 /* Ioctls that require bound socket */
921 static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
922 unsigned long arg)
923 {
924 struct hci_dev *hdev = hci_pi(sk)->hdev;
925
926 if (!hdev)
927 return -EBADFD;
928
929 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
930 return -EBUSY;
931
932 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
933 return -EOPNOTSUPP;
934
935 if (hdev->dev_type != HCI_PRIMARY)
936 return -EOPNOTSUPP;
937
938 switch (cmd) {
939 case HCISETRAW:
940 if (!capable(CAP_NET_ADMIN))
941 return -EPERM;
942 return -EOPNOTSUPP;
943
944 case HCIGETCONNINFO:
945 return hci_get_conn_info(hdev, (void __user *)arg);
946
947 case HCIGETAUTHINFO:
948 return hci_get_auth_info(hdev, (void __user *)arg);
949
950 case HCIBLOCKADDR:
951 if (!capable(CAP_NET_ADMIN))
952 return -EPERM;
953 return hci_sock_blacklist_add(hdev, (void __user *)arg);
954
955 case HCIUNBLOCKADDR:
956 if (!capable(CAP_NET_ADMIN))
957 return -EPERM;
958 return hci_sock_blacklist_del(hdev, (void __user *)arg);
959 }
960
961 return -ENOIOCTLCMD;
962 }
963
964 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
965 unsigned long arg)
966 {
967 void __user *argp = (void __user *)arg;
968 struct sock *sk = sock->sk;
969 int err;
970
971 BT_DBG("cmd %x arg %lx", cmd, arg);
972
973 lock_sock(sk);
974
975 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
976 err = -EBADFD;
977 goto done;
978 }
979
980 /* When calling an ioctl on an unbound raw socket, then ensure
981 * that the monitor gets informed. Ensure that the resulting event
982 * is only send once by checking if the cookie exists or not. The
983 * socket cookie will be only ever generated once for the lifetime
984 * of a given socket.
985 */
986 if (hci_sock_gen_cookie(sk)) {
987 struct sk_buff *skb;
988
989 if (capable(CAP_NET_ADMIN))
990 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
991
992 /* Send event to monitor */
993 skb = create_monitor_ctrl_open(sk);
994 if (skb) {
995 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
996 HCI_SOCK_TRUSTED, NULL);
997 kfree_skb(skb);
998 }
999 }
1000
1001 release_sock(sk);
1002
1003 switch (cmd) {
1004 case HCIGETDEVLIST:
1005 return hci_get_dev_list(argp);
1006
1007 case HCIGETDEVINFO:
1008 return hci_get_dev_info(argp);
1009
1010 case HCIGETCONNLIST:
1011 return hci_get_conn_list(argp);
1012
1013 case HCIDEVUP:
1014 if (!capable(CAP_NET_ADMIN))
1015 return -EPERM;
1016 return hci_dev_open(arg);
1017
1018 case HCIDEVDOWN:
1019 if (!capable(CAP_NET_ADMIN))
1020 return -EPERM;
1021 return hci_dev_close(arg);
1022
1023 case HCIDEVRESET:
1024 if (!capable(CAP_NET_ADMIN))
1025 return -EPERM;
1026 return hci_dev_reset(arg);
1027
1028 case HCIDEVRESTAT:
1029 if (!capable(CAP_NET_ADMIN))
1030 return -EPERM;
1031 return hci_dev_reset_stat(arg);
1032
1033 case HCISETSCAN:
1034 case HCISETAUTH:
1035 case HCISETENCRYPT:
1036 case HCISETPTYPE:
1037 case HCISETLINKPOL:
1038 case HCISETLINKMODE:
1039 case HCISETACLMTU:
1040 case HCISETSCOMTU:
1041 if (!capable(CAP_NET_ADMIN))
1042 return -EPERM;
1043 return hci_dev_cmd(cmd, argp);
1044
1045 case HCIINQUIRY:
1046 return hci_inquiry(argp);
1047 }
1048
1049 lock_sock(sk);
1050
1051 err = hci_sock_bound_ioctl(sk, cmd, arg);
1052
1053 done:
1054 release_sock(sk);
1055 return err;
1056 }
1057
1058 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
1059 int addr_len)
1060 {
1061 struct sockaddr_hci haddr;
1062 struct sock *sk = sock->sk;
1063 struct hci_dev *hdev = NULL;
1064 struct sk_buff *skb;
1065 int len, err = 0;
1066
1067 BT_DBG("sock %p sk %p", sock, sk);
1068
1069 if (!addr)
1070 return -EINVAL;
1071
1072 memset(&haddr, 0, sizeof(haddr));
1073 len = min_t(unsigned int, sizeof(haddr), addr_len);
1074 memcpy(&haddr, addr, len);
1075
1076 if (haddr.hci_family != AF_BLUETOOTH)
1077 return -EINVAL;
1078
1079 lock_sock(sk);
1080
1081 if (sk->sk_state == BT_BOUND) {
1082 err = -EALREADY;
1083 goto done;
1084 }
1085
1086 switch (haddr.hci_channel) {
1087 case HCI_CHANNEL_RAW:
1088 if (hci_pi(sk)->hdev) {
1089 err = -EALREADY;
1090 goto done;
1091 }
1092
1093 if (haddr.hci_dev != HCI_DEV_NONE) {
1094 hdev = hci_dev_get(haddr.hci_dev);
1095 if (!hdev) {
1096 err = -ENODEV;
1097 goto done;
1098 }
1099
1100 atomic_inc(&hdev->promisc);
1101 }
1102
1103 hci_pi(sk)->channel = haddr.hci_channel;
1104
1105 if (!hci_sock_gen_cookie(sk)) {
1106 /* In the case when a cookie has already been assigned,
1107 * then there has been already an ioctl issued against
1108 * an unbound socket and with that triggerd an open
1109 * notification. Send a close notification first to
1110 * allow the state transition to bounded.
1111 */
1112 skb = create_monitor_ctrl_close(sk);
1113 if (skb) {
1114 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1115 HCI_SOCK_TRUSTED, NULL);
1116 kfree_skb(skb);
1117 }
1118 }
1119
1120 if (capable(CAP_NET_ADMIN))
1121 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1122
1123 hci_pi(sk)->hdev = hdev;
1124
1125 /* Send event to monitor */
1126 skb = create_monitor_ctrl_open(sk);
1127 if (skb) {
1128 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1129 HCI_SOCK_TRUSTED, NULL);
1130 kfree_skb(skb);
1131 }
1132 break;
1133
1134 case HCI_CHANNEL_USER:
1135 if (hci_pi(sk)->hdev) {
1136 err = -EALREADY;
1137 goto done;
1138 }
1139
1140 if (haddr.hci_dev == HCI_DEV_NONE) {
1141 err = -EINVAL;
1142 goto done;
1143 }
1144
1145 if (!capable(CAP_NET_ADMIN)) {
1146 err = -EPERM;
1147 goto done;
1148 }
1149
1150 hdev = hci_dev_get(haddr.hci_dev);
1151 if (!hdev) {
1152 err = -ENODEV;
1153 goto done;
1154 }
1155
1156 if (test_bit(HCI_INIT, &hdev->flags) ||
1157 hci_dev_test_flag(hdev, HCI_SETUP) ||
1158 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1159 (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) &&
1160 test_bit(HCI_UP, &hdev->flags))) {
1161 err = -EBUSY;
1162 hci_dev_put(hdev);
1163 goto done;
1164 }
1165
1166 if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) {
1167 err = -EUSERS;
1168 hci_dev_put(hdev);
1169 goto done;
1170 }
1171
1172 mgmt_index_removed(hdev);
1173
1174 err = hci_dev_open(hdev->id);
1175 if (err) {
1176 if (err == -EALREADY) {
1177 /* In case the transport is already up and
1178 * running, clear the error here.
1179 *
1180 * This can happen when opening a user
1181 * channel and HCI_AUTO_OFF grace period
1182 * is still active.
1183 */
1184 err = 0;
1185 } else {
1186 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
1187 mgmt_index_added(hdev);
1188 hci_dev_put(hdev);
1189 goto done;
1190 }
1191 }
1192
1193 hci_pi(sk)->channel = haddr.hci_channel;
1194
1195 if (!hci_sock_gen_cookie(sk)) {
1196 /* In the case when a cookie has already been assigned,
1197 * this socket will transition from a raw socket into
1198 * a user channel socket. For a clean transition, send
1199 * the close notification first.
1200 */
1201 skb = create_monitor_ctrl_close(sk);
1202 if (skb) {
1203 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1204 HCI_SOCK_TRUSTED, NULL);
1205 kfree_skb(skb);
1206 }
1207 }
1208
1209 /* The user channel is restricted to CAP_NET_ADMIN
1210 * capabilities and with that implicitly trusted.
1211 */
1212 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1213
1214 hci_pi(sk)->hdev = hdev;
1215
1216 /* Send event to monitor */
1217 skb = create_monitor_ctrl_open(sk);
1218 if (skb) {
1219 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1220 HCI_SOCK_TRUSTED, NULL);
1221 kfree_skb(skb);
1222 }
1223
1224 atomic_inc(&hdev->promisc);
1225 break;
1226
1227 case HCI_CHANNEL_MONITOR:
1228 if (haddr.hci_dev != HCI_DEV_NONE) {
1229 err = -EINVAL;
1230 goto done;
1231 }
1232
1233 if (!capable(CAP_NET_RAW)) {
1234 err = -EPERM;
1235 goto done;
1236 }
1237
1238 hci_pi(sk)->channel = haddr.hci_channel;
1239
1240 /* The monitor interface is restricted to CAP_NET_RAW
1241 * capabilities and with that implicitly trusted.
1242 */
1243 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1244
1245 send_monitor_note(sk, "Linux version %s (%s)",
1246 init_utsname()->release,
1247 init_utsname()->machine);
1248 send_monitor_note(sk, "Bluetooth subsystem version %u.%u",
1249 BT_SUBSYS_VERSION, BT_SUBSYS_REVISION);
1250 send_monitor_replay(sk);
1251 send_monitor_control_replay(sk);
1252
1253 atomic_inc(&monitor_promisc);
1254 break;
1255
1256 case HCI_CHANNEL_LOGGING:
1257 if (haddr.hci_dev != HCI_DEV_NONE) {
1258 err = -EINVAL;
1259 goto done;
1260 }
1261
1262 if (!capable(CAP_NET_ADMIN)) {
1263 err = -EPERM;
1264 goto done;
1265 }
1266
1267 hci_pi(sk)->channel = haddr.hci_channel;
1268 break;
1269
1270 default:
1271 if (!hci_mgmt_chan_find(haddr.hci_channel)) {
1272 err = -EINVAL;
1273 goto done;
1274 }
1275
1276 if (haddr.hci_dev != HCI_DEV_NONE) {
1277 err = -EINVAL;
1278 goto done;
1279 }
1280
1281 /* Users with CAP_NET_ADMIN capabilities are allowed
1282 * access to all management commands and events. For
1283 * untrusted users the interface is restricted and
1284 * also only untrusted events are sent.
1285 */
1286 if (capable(CAP_NET_ADMIN))
1287 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1288
1289 hci_pi(sk)->channel = haddr.hci_channel;
1290
1291 /* At the moment the index and unconfigured index events
1292 * are enabled unconditionally. Setting them on each
1293 * socket when binding keeps this functionality. They
1294 * however might be cleared later and then sending of these
1295 * events will be disabled, but that is then intentional.
1296 *
1297 * This also enables generic events that are safe to be
1298 * received by untrusted users. Example for such events
1299 * are changes to settings, class of device, name etc.
1300 */
1301 if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) {
1302 if (!hci_sock_gen_cookie(sk)) {
1303 /* In the case when a cookie has already been
1304 * assigned, this socket will transtion from
1305 * a raw socket into a control socket. To
1306 * allow for a clean transtion, send the
1307 * close notification first.
1308 */
1309 skb = create_monitor_ctrl_close(sk);
1310 if (skb) {
1311 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1312 HCI_SOCK_TRUSTED, NULL);
1313 kfree_skb(skb);
1314 }
1315 }
1316
1317 /* Send event to monitor */
1318 skb = create_monitor_ctrl_open(sk);
1319 if (skb) {
1320 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1321 HCI_SOCK_TRUSTED, NULL);
1322 kfree_skb(skb);
1323 }
1324
1325 hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS);
1326 hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);
1327 hci_sock_set_flag(sk, HCI_MGMT_OPTION_EVENTS);
1328 hci_sock_set_flag(sk, HCI_MGMT_SETTING_EVENTS);
1329 hci_sock_set_flag(sk, HCI_MGMT_DEV_CLASS_EVENTS);
1330 hci_sock_set_flag(sk, HCI_MGMT_LOCAL_NAME_EVENTS);
1331 }
1332 break;
1333 }
1334
1335 sk->sk_state = BT_BOUND;
1336
1337 done:
1338 release_sock(sk);
1339 return err;
1340 }
1341
1342 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
1343 int *addr_len, int peer)
1344 {
1345 struct sockaddr_hci *haddr = (struct sockaddr_hci *)addr;
1346 struct sock *sk = sock->sk;
1347 struct hci_dev *hdev;
1348 int err = 0;
1349
1350 BT_DBG("sock %p sk %p", sock, sk);
1351
1352 if (peer)
1353 return -EOPNOTSUPP;
1354
1355 lock_sock(sk);
1356
1357 hdev = hci_pi(sk)->hdev;
1358 if (!hdev) {
1359 err = -EBADFD;
1360 goto done;
1361 }
1362
1363 *addr_len = sizeof(*haddr);
1364 haddr->hci_family = AF_BLUETOOTH;
1365 haddr->hci_dev = hdev->id;
1366 haddr->hci_channel= hci_pi(sk)->channel;
1367
1368 done:
1369 release_sock(sk);
1370 return err;
1371 }
1372
1373 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
1374 struct sk_buff *skb)
1375 {
1376 __u32 mask = hci_pi(sk)->cmsg_mask;
1377
1378 if (mask & HCI_CMSG_DIR) {
1379 int incoming = bt_cb(skb)->incoming;
1380 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
1381 &incoming);
1382 }
1383
1384 if (mask & HCI_CMSG_TSTAMP) {
1385 #ifdef CONFIG_COMPAT
1386 struct compat_timeval ctv;
1387 #endif
1388 struct timeval tv;
1389 void *data;
1390 int len;
1391
1392 skb_get_timestamp(skb, &tv);
1393
1394 data = &tv;
1395 len = sizeof(tv);
1396 #ifdef CONFIG_COMPAT
1397 if (!COMPAT_USE_64BIT_TIME &&
1398 (msg->msg_flags & MSG_CMSG_COMPAT)) {
1399 ctv.tv_sec = tv.tv_sec;
1400 ctv.tv_usec = tv.tv_usec;
1401 data = &ctv;
1402 len = sizeof(ctv);
1403 }
1404 #endif
1405
1406 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
1407 }
1408 }
1409
1410 static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1411 size_t len, int flags)
1412 {
1413 int noblock = flags & MSG_DONTWAIT;
1414 struct sock *sk = sock->sk;
1415 struct sk_buff *skb;
1416 int copied, err;
1417 unsigned int skblen;
1418
1419 BT_DBG("sock %p, sk %p", sock, sk);
1420
1421 if (flags & MSG_OOB)
1422 return -EOPNOTSUPP;
1423
1424 if (hci_pi(sk)->channel == HCI_CHANNEL_LOGGING)
1425 return -EOPNOTSUPP;
1426
1427 if (sk->sk_state == BT_CLOSED)
1428 return 0;
1429
1430 skb = skb_recv_datagram(sk, flags, noblock, &err);
1431 if (!skb)
1432 return err;
1433
1434 skblen = skb->len;
1435 copied = skb->len;
1436 if (len < copied) {
1437 msg->msg_flags |= MSG_TRUNC;
1438 copied = len;
1439 }
1440
1441 skb_reset_transport_header(skb);
1442 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1443
1444 switch (hci_pi(sk)->channel) {
1445 case HCI_CHANNEL_RAW:
1446 hci_sock_cmsg(sk, msg, skb);
1447 break;
1448 case HCI_CHANNEL_USER:
1449 case HCI_CHANNEL_MONITOR:
1450 sock_recv_timestamp(msg, sk, skb);
1451 break;
1452 default:
1453 if (hci_mgmt_chan_find(hci_pi(sk)->channel))
1454 sock_recv_timestamp(msg, sk, skb);
1455 break;
1456 }
1457
1458 skb_free_datagram(sk, skb);
1459
1460 if (flags & MSG_TRUNC)
1461 copied = skblen;
1462
1463 return err ? : copied;
1464 }
1465
1466 static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
1467 struct msghdr *msg, size_t msglen)
1468 {
1469 void *buf;
1470 u8 *cp;
1471 struct mgmt_hdr *hdr;
1472 u16 opcode, index, len;
1473 struct hci_dev *hdev = NULL;
1474 const struct hci_mgmt_handler *handler;
1475 bool var_len, no_hdev;
1476 int err;
1477
1478 BT_DBG("got %zu bytes", msglen);
1479
1480 if (msglen < sizeof(*hdr))
1481 return -EINVAL;
1482
1483 buf = kmalloc(msglen, GFP_KERNEL);
1484 if (!buf)
1485 return -ENOMEM;
1486
1487 if (memcpy_from_msg(buf, msg, msglen)) {
1488 err = -EFAULT;
1489 goto done;
1490 }
1491
1492 hdr = buf;
1493 opcode = __le16_to_cpu(hdr->opcode);
1494 index = __le16_to_cpu(hdr->index);
1495 len = __le16_to_cpu(hdr->len);
1496
1497 if (len != msglen - sizeof(*hdr)) {
1498 err = -EINVAL;
1499 goto done;
1500 }
1501
1502 if (chan->channel == HCI_CHANNEL_CONTROL) {
1503 struct sk_buff *skb;
1504
1505 /* Send event to monitor */
1506 skb = create_monitor_ctrl_command(sk, index, opcode, len,
1507 buf + sizeof(*hdr));
1508 if (skb) {
1509 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1510 HCI_SOCK_TRUSTED, NULL);
1511 kfree_skb(skb);
1512 }
1513 }
1514
1515 if (opcode >= chan->handler_count ||
1516 chan->handlers[opcode].func == NULL) {
1517 BT_DBG("Unknown op %u", opcode);
1518 err = mgmt_cmd_status(sk, index, opcode,
1519 MGMT_STATUS_UNKNOWN_COMMAND);
1520 goto done;
1521 }
1522
1523 handler = &chan->handlers[opcode];
1524
1525 if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
1526 !(handler->flags & HCI_MGMT_UNTRUSTED)) {
1527 err = mgmt_cmd_status(sk, index, opcode,
1528 MGMT_STATUS_PERMISSION_DENIED);
1529 goto done;
1530 }
1531
1532 if (index != MGMT_INDEX_NONE) {
1533 hdev = hci_dev_get(index);
1534 if (!hdev) {
1535 err = mgmt_cmd_status(sk, index, opcode,
1536 MGMT_STATUS_INVALID_INDEX);
1537 goto done;
1538 }
1539
1540 if (hci_dev_test_flag(hdev, HCI_SETUP) ||
1541 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1542 hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1543 err = mgmt_cmd_status(sk, index, opcode,
1544 MGMT_STATUS_INVALID_INDEX);
1545 goto done;
1546 }
1547
1548 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1549 !(handler->flags & HCI_MGMT_UNCONFIGURED)) {
1550 err = mgmt_cmd_status(sk, index, opcode,
1551 MGMT_STATUS_INVALID_INDEX);
1552 goto done;
1553 }
1554 }
1555
1556 no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
1557 if (no_hdev != !hdev) {
1558 err = mgmt_cmd_status(sk, index, opcode,
1559 MGMT_STATUS_INVALID_INDEX);
1560 goto done;
1561 }
1562
1563 var_len = (handler->flags & HCI_MGMT_VAR_LEN);
1564 if ((var_len && len < handler->data_len) ||
1565 (!var_len && len != handler->data_len)) {
1566 err = mgmt_cmd_status(sk, index, opcode,
1567 MGMT_STATUS_INVALID_PARAMS);
1568 goto done;
1569 }
1570
1571 if (hdev && chan->hdev_init)
1572 chan->hdev_init(sk, hdev);
1573
1574 cp = buf + sizeof(*hdr);
1575
1576 err = handler->func(sk, hdev, cp, len);
1577 if (err < 0)
1578 goto done;
1579
1580 err = msglen;
1581
1582 done:
1583 if (hdev)
1584 hci_dev_put(hdev);
1585
1586 kfree(buf);
1587 return err;
1588 }
1589
1590 static int hci_logging_frame(struct sock *sk, struct msghdr *msg, int len)
1591 {
1592 struct hci_mon_hdr *hdr;
1593 struct sk_buff *skb;
1594 struct hci_dev *hdev;
1595 u16 index;
1596 int err;
1597
1598 /* The logging frame consists at minimum of the standard header,
1599 * the priority byte, the ident length byte and at least one string
1600 * terminator NUL byte. Anything shorter are invalid packets.
1601 */
1602 if (len < sizeof(*hdr) + 3)
1603 return -EINVAL;
1604
1605 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1606 if (!skb)
1607 return err;
1608
1609 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1610 err = -EFAULT;
1611 goto drop;
1612 }
1613
1614 hdr = (void *)skb->data;
1615
1616 if (__le16_to_cpu(hdr->len) != len - sizeof(*hdr)) {
1617 err = -EINVAL;
1618 goto drop;
1619 }
1620
1621 if (__le16_to_cpu(hdr->opcode) == 0x0000) {
1622 __u8 priority = skb->data[sizeof(*hdr)];
1623 __u8 ident_len = skb->data[sizeof(*hdr) + 1];
1624
1625 /* Only the priorities 0-7 are valid and with that any other
1626 * value results in an invalid packet.
1627 *
1628 * The priority byte is followed by an ident length byte and
1629 * the NUL terminated ident string. Check that the ident
1630 * length is not overflowing the packet and also that the
1631 * ident string itself is NUL terminated. In case the ident
1632 * length is zero, the length value actually doubles as NUL
1633 * terminator identifier.
1634 *
1635 * The message follows the ident string (if present) and
1636 * must be NUL terminated. Otherwise it is not a valid packet.
1637 */
1638 if (priority > 7 || skb->data[len - 1] != 0x00 ||
1639 ident_len > len - sizeof(*hdr) - 3 ||
1640 skb->data[sizeof(*hdr) + ident_len + 1] != 0x00) {
1641 err = -EINVAL;
1642 goto drop;
1643 }
1644 } else {
1645 err = -EINVAL;
1646 goto drop;
1647 }
1648
1649 index = __le16_to_cpu(hdr->index);
1650
1651 if (index != MGMT_INDEX_NONE) {
1652 hdev = hci_dev_get(index);
1653 if (!hdev) {
1654 err = -ENODEV;
1655 goto drop;
1656 }
1657 } else {
1658 hdev = NULL;
1659 }
1660
1661 hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING);
1662
1663 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL);
1664 err = len;
1665
1666 if (hdev)
1667 hci_dev_put(hdev);
1668
1669 drop:
1670 kfree_skb(skb);
1671 return err;
1672 }
1673
1674 static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1675 size_t len)
1676 {
1677 struct sock *sk = sock->sk;
1678 struct hci_mgmt_chan *chan;
1679 struct hci_dev *hdev;
1680 struct sk_buff *skb;
1681 int err;
1682
1683 BT_DBG("sock %p sk %p", sock, sk);
1684
1685 if (msg->msg_flags & MSG_OOB)
1686 return -EOPNOTSUPP;
1687
1688 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE|
1689 MSG_CMSG_COMPAT))
1690 return -EINVAL;
1691
1692 if (len < 4 || len > HCI_MAX_FRAME_SIZE)
1693 return -EINVAL;
1694
1695 lock_sock(sk);
1696
1697 switch (hci_pi(sk)->channel) {
1698 case HCI_CHANNEL_RAW:
1699 case HCI_CHANNEL_USER:
1700 break;
1701 case HCI_CHANNEL_MONITOR:
1702 err = -EOPNOTSUPP;
1703 goto done;
1704 case HCI_CHANNEL_LOGGING:
1705 err = hci_logging_frame(sk, msg, len);
1706 goto done;
1707 default:
1708 mutex_lock(&mgmt_chan_list_lock);
1709 chan = __hci_mgmt_chan_find(hci_pi(sk)->channel);
1710 if (chan)
1711 err = hci_mgmt_cmd(chan, sk, msg, len);
1712 else
1713 err = -EINVAL;
1714
1715 mutex_unlock(&mgmt_chan_list_lock);
1716 goto done;
1717 }
1718
1719 hdev = hci_pi(sk)->hdev;
1720 if (!hdev) {
1721 err = -EBADFD;
1722 goto done;
1723 }
1724
1725 if (!test_bit(HCI_UP, &hdev->flags)) {
1726 err = -ENETDOWN;
1727 goto done;
1728 }
1729
1730 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
1731 if (!skb)
1732 goto done;
1733
1734 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1735 err = -EFAULT;
1736 goto drop;
1737 }
1738
1739 hci_skb_pkt_type(skb) = skb->data[0];
1740 skb_pull(skb, 1);
1741
1742 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
1743 /* No permission check is needed for user channel
1744 * since that gets enforced when binding the socket.
1745 *
1746 * However check that the packet type is valid.
1747 */
1748 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
1749 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1750 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT) {
1751 err = -EINVAL;
1752 goto drop;
1753 }
1754
1755 skb_queue_tail(&hdev->raw_q, skb);
1756 queue_work(hdev->workqueue, &hdev->tx_work);
1757 } else if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
1758 u16 opcode = get_unaligned_le16(skb->data);
1759 u16 ogf = hci_opcode_ogf(opcode);
1760 u16 ocf = hci_opcode_ocf(opcode);
1761
1762 if (((ogf > HCI_SFLT_MAX_OGF) ||
1763 !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
1764 &hci_sec_filter.ocf_mask[ogf])) &&
1765 !capable(CAP_NET_RAW)) {
1766 err = -EPERM;
1767 goto drop;
1768 }
1769
1770 /* Since the opcode has already been extracted here, store
1771 * a copy of the value for later use by the drivers.
1772 */
1773 hci_skb_opcode(skb) = opcode;
1774
1775 if (ogf == 0x3f) {
1776 skb_queue_tail(&hdev->raw_q, skb);
1777 queue_work(hdev->workqueue, &hdev->tx_work);
1778 } else {
1779 /* Stand-alone HCI commands must be flagged as
1780 * single-command requests.
1781 */
1782 bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
1783
1784 skb_queue_tail(&hdev->cmd_q, skb);
1785 queue_work(hdev->workqueue, &hdev->cmd_work);
1786 }
1787 } else {
1788 if (!capable(CAP_NET_RAW)) {
1789 err = -EPERM;
1790 goto drop;
1791 }
1792
1793 if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1794 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT) {
1795 err = -EINVAL;
1796 goto drop;
1797 }
1798
1799 skb_queue_tail(&hdev->raw_q, skb);
1800 queue_work(hdev->workqueue, &hdev->tx_work);
1801 }
1802
1803 err = len;
1804
1805 done:
1806 release_sock(sk);
1807 return err;
1808
1809 drop:
1810 kfree_skb(skb);
1811 goto done;
1812 }
1813
1814 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1815 char __user *optval, unsigned int len)
1816 {
1817 struct hci_ufilter uf = { .opcode = 0 };
1818 struct sock *sk = sock->sk;
1819 int err = 0, opt = 0;
1820
1821 BT_DBG("sk %p, opt %d", sk, optname);
1822
1823 if (level != SOL_HCI)
1824 return -ENOPROTOOPT;
1825
1826 lock_sock(sk);
1827
1828 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1829 err = -EBADFD;
1830 goto done;
1831 }
1832
1833 switch (optname) {
1834 case HCI_DATA_DIR:
1835 if (get_user(opt, (int __user *)optval)) {
1836 err = -EFAULT;
1837 break;
1838 }
1839
1840 if (opt)
1841 hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1842 else
1843 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1844 break;
1845
1846 case HCI_TIME_STAMP:
1847 if (get_user(opt, (int __user *)optval)) {
1848 err = -EFAULT;
1849 break;
1850 }
1851
1852 if (opt)
1853 hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1854 else
1855 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1856 break;
1857
1858 case HCI_FILTER:
1859 {
1860 struct hci_filter *f = &hci_pi(sk)->filter;
1861
1862 uf.type_mask = f->type_mask;
1863 uf.opcode = f->opcode;
1864 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1865 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1866 }
1867
1868 len = min_t(unsigned int, len, sizeof(uf));
1869 if (copy_from_user(&uf, optval, len)) {
1870 err = -EFAULT;
1871 break;
1872 }
1873
1874 if (!capable(CAP_NET_RAW)) {
1875 uf.type_mask &= hci_sec_filter.type_mask;
1876 uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1877 uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1878 }
1879
1880 {
1881 struct hci_filter *f = &hci_pi(sk)->filter;
1882
1883 f->type_mask = uf.type_mask;
1884 f->opcode = uf.opcode;
1885 *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1886 *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1887 }
1888 break;
1889
1890 default:
1891 err = -ENOPROTOOPT;
1892 break;
1893 }
1894
1895 done:
1896 release_sock(sk);
1897 return err;
1898 }
1899
1900 static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
1901 char __user *optval, int __user *optlen)
1902 {
1903 struct hci_ufilter uf;
1904 struct sock *sk = sock->sk;
1905 int len, opt, err = 0;
1906
1907 BT_DBG("sk %p, opt %d", sk, optname);
1908
1909 if (level != SOL_HCI)
1910 return -ENOPROTOOPT;
1911
1912 if (get_user(len, optlen))
1913 return -EFAULT;
1914
1915 lock_sock(sk);
1916
1917 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1918 err = -EBADFD;
1919 goto done;
1920 }
1921
1922 switch (optname) {
1923 case HCI_DATA_DIR:
1924 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1925 opt = 1;
1926 else
1927 opt = 0;
1928
1929 if (put_user(opt, optval))
1930 err = -EFAULT;
1931 break;
1932
1933 case HCI_TIME_STAMP:
1934 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1935 opt = 1;
1936 else
1937 opt = 0;
1938
1939 if (put_user(opt, optval))
1940 err = -EFAULT;
1941 break;
1942
1943 case HCI_FILTER:
1944 {
1945 struct hci_filter *f = &hci_pi(sk)->filter;
1946
1947 memset(&uf, 0, sizeof(uf));
1948 uf.type_mask = f->type_mask;
1949 uf.opcode = f->opcode;
1950 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1951 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1952 }
1953
1954 len = min_t(unsigned int, len, sizeof(uf));
1955 if (copy_to_user(optval, &uf, len))
1956 err = -EFAULT;
1957 break;
1958
1959 default:
1960 err = -ENOPROTOOPT;
1961 break;
1962 }
1963
1964 done:
1965 release_sock(sk);
1966 return err;
1967 }
1968
1969 static const struct proto_ops hci_sock_ops = {
1970 .family = PF_BLUETOOTH,
1971 .owner = THIS_MODULE,
1972 .release = hci_sock_release,
1973 .bind = hci_sock_bind,
1974 .getname = hci_sock_getname,
1975 .sendmsg = hci_sock_sendmsg,
1976 .recvmsg = hci_sock_recvmsg,
1977 .ioctl = hci_sock_ioctl,
1978 .poll = datagram_poll,
1979 .listen = sock_no_listen,
1980 .shutdown = sock_no_shutdown,
1981 .setsockopt = hci_sock_setsockopt,
1982 .getsockopt = hci_sock_getsockopt,
1983 .connect = sock_no_connect,
1984 .socketpair = sock_no_socketpair,
1985 .accept = sock_no_accept,
1986 .mmap = sock_no_mmap
1987 };
1988
1989 static struct proto hci_sk_proto = {
1990 .name = "HCI",
1991 .owner = THIS_MODULE,
1992 .obj_size = sizeof(struct hci_pinfo)
1993 };
1994
1995 static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
1996 int kern)
1997 {
1998 struct sock *sk;
1999
2000 BT_DBG("sock %p", sock);
2001
2002 if (sock->type != SOCK_RAW)
2003 return -ESOCKTNOSUPPORT;
2004
2005 sock->ops = &hci_sock_ops;
2006
2007 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, kern);
2008 if (!sk)
2009 return -ENOMEM;
2010
2011 sock_init_data(sock, sk);
2012
2013 sock_reset_flag(sk, SOCK_ZAPPED);
2014
2015 sk->sk_protocol = protocol;
2016
2017 sock->state = SS_UNCONNECTED;
2018 sk->sk_state = BT_OPEN;
2019
2020 bt_sock_link(&hci_sk_list, sk);
2021 return 0;
2022 }
2023
2024 static const struct net_proto_family hci_sock_family_ops = {
2025 .family = PF_BLUETOOTH,
2026 .owner = THIS_MODULE,
2027 .create = hci_sock_create,
2028 };
2029
2030 int __init hci_sock_init(void)
2031 {
2032 int err;
2033
2034 BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr));
2035
2036 err = proto_register(&hci_sk_proto, 0);
2037 if (err < 0)
2038 return err;
2039
2040 err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
2041 if (err < 0) {
2042 BT_ERR("HCI socket registration failed");
2043 goto error;
2044 }
2045
2046 err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
2047 if (err < 0) {
2048 BT_ERR("Failed to create HCI proc file");
2049 bt_sock_unregister(BTPROTO_HCI);
2050 goto error;
2051 }
2052
2053 BT_INFO("HCI socket layer initialized");
2054
2055 return 0;
2056
2057 error:
2058 proto_unregister(&hci_sk_proto);
2059 return err;
2060 }
2061
2062 void hci_sock_cleanup(void)
2063 {
2064 bt_procfs_cleanup(&init_net, "hci");
2065 bt_sock_unregister(BTPROTO_HCI);
2066 proto_unregister(&hci_sk_proto);
2067 }
ubuntu-bionic-kernel mirror