1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23 */
24
25 /* Bluetooth HCI sockets. */
26 #include <linux/compat.h>
27 #include <linux/export.h>
28 #include <linux/utsname.h>
29 #include <linux/sched.h>
30 #include <asm/unaligned.h>
31
32 #include <net/bluetooth/bluetooth.h>
33 #include <net/bluetooth/hci_core.h>
34 #include <net/bluetooth/hci_mon.h>
35 #include <net/bluetooth/mgmt.h>
36
37 #include "mgmt_util.h"
38
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 __u8 cmsg_mask;
56 unsigned short channel;
57 unsigned long flags;
58 __u32 cookie;
59 char comm[TASK_COMM_LEN];
60 __u16 mtu;
61 };
62
hci_hdev_from_sock(struct sock * sk)63 static struct hci_dev *hci_hdev_from_sock(struct sock *sk)
64 {
65 struct hci_dev *hdev = hci_pi(sk)->hdev;
66
67 if (!hdev)
68 return ERR_PTR(-EBADFD);
69 if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
70 return ERR_PTR(-EPIPE);
71 return hdev;
72 }
73
hci_sock_set_flag(struct sock * sk,int nr)74 void hci_sock_set_flag(struct sock *sk, int nr)
75 {
76 set_bit(nr, &hci_pi(sk)->flags);
77 }
78
hci_sock_clear_flag(struct sock * sk,int nr)79 void hci_sock_clear_flag(struct sock *sk, int nr)
80 {
81 clear_bit(nr, &hci_pi(sk)->flags);
82 }
83
hci_sock_test_flag(struct sock * sk,int nr)84 int hci_sock_test_flag(struct sock *sk, int nr)
85 {
86 return test_bit(nr, &hci_pi(sk)->flags);
87 }
88
hci_sock_get_channel(struct sock * sk)89 unsigned short hci_sock_get_channel(struct sock *sk)
90 {
91 return hci_pi(sk)->channel;
92 }
93
hci_sock_get_cookie(struct sock * sk)94 u32 hci_sock_get_cookie(struct sock *sk)
95 {
96 return hci_pi(sk)->cookie;
97 }
98
hci_sock_gen_cookie(struct sock * sk)99 static bool hci_sock_gen_cookie(struct sock *sk)
100 {
101 int id = hci_pi(sk)->cookie;
102
103 if (!id) {
104 id = ida_simple_get(&sock_cookie_ida, 1, 0, GFP_KERNEL);
105 if (id < 0)
106 id = 0xffffffff;
107
108 hci_pi(sk)->cookie = id;
109 get_task_comm(hci_pi(sk)->comm, current);
110 return true;
111 }
112
113 return false;
114 }
115
hci_sock_free_cookie(struct sock * sk)116 static void hci_sock_free_cookie(struct sock *sk)
117 {
118 int id = hci_pi(sk)->cookie;
119
120 if (id) {
121 hci_pi(sk)->cookie = 0xffffffff;
122 ida_simple_remove(&sock_cookie_ida, id);
123 }
124 }
125
hci_test_bit(int nr,const void * addr)126 static inline int hci_test_bit(int nr, const void *addr)
127 {
128 return *((const __u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
129 }
130
131 /* Security filter */
132 #define HCI_SFLT_MAX_OGF 5
133
134 struct hci_sec_filter {
135 __u32 type_mask;
136 __u32 event_mask[2];
137 __u32 ocf_mask[HCI_SFLT_MAX_OGF + 1][4];
138 };
139
140 static const struct hci_sec_filter hci_sec_filter = {
141 /* Packet types */
142 0x10,
143 /* Events */
144 { 0x1000d9fe, 0x0000b00c },
145 /* Commands */
146 {
147 { 0x0 },
148 /* OGF_LINK_CTL */
149 { 0xbe000006, 0x00000001, 0x00000000, 0x00 },
150 /* OGF_LINK_POLICY */
151 { 0x00005200, 0x00000000, 0x00000000, 0x00 },
152 /* OGF_HOST_CTL */
153 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
154 /* OGF_INFO_PARAM */
155 { 0x000002be, 0x00000000, 0x00000000, 0x00 },
156 /* OGF_STATUS_PARAM */
157 { 0x000000ea, 0x00000000, 0x00000000, 0x00 }
158 }
159 };
160
161 static struct bt_sock_list hci_sk_list = {
162 .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
163 };
164
is_filtered_packet(struct sock * sk,struct sk_buff * skb)165 static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb)
166 {
167 struct hci_filter *flt;
168 int flt_type, flt_event;
169
170 /* Apply filter */
171 flt = &hci_pi(sk)->filter;
172
173 flt_type = hci_skb_pkt_type(skb) & HCI_FLT_TYPE_BITS;
174
175 if (!test_bit(flt_type, &flt->type_mask))
176 return true;
177
178 /* Extra filter for event packets only */
179 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT)
180 return false;
181
182 flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
183
184 if (!hci_test_bit(flt_event, &flt->event_mask))
185 return true;
186
187 /* Check filter only when opcode is set */
188 if (!flt->opcode)
189 return false;
190
191 if (flt_event == HCI_EV_CMD_COMPLETE &&
192 flt->opcode != get_unaligned((__le16 *)(skb->data + 3)))
193 return true;
194
195 if (flt_event == HCI_EV_CMD_STATUS &&
196 flt->opcode != get_unaligned((__le16 *)(skb->data + 4)))
197 return true;
198
199 return false;
200 }
201
202 /* Send frame to RAW socket */
hci_send_to_sock(struct hci_dev * hdev,struct sk_buff * skb)203 void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
204 {
205 struct sock *sk;
206 struct sk_buff *skb_copy = NULL;
207
208 BT_DBG("hdev %p len %d", hdev, skb->len);
209
210 read_lock(&hci_sk_list.lock);
211
212 sk_for_each(sk, &hci_sk_list.head) {
213 struct sk_buff *nskb;
214
215 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
216 continue;
217
218 /* Don't send frame to the socket it came from */
219 if (skb->sk == sk)
220 continue;
221
222 if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
223 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
224 hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
225 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
226 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
227 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT)
228 continue;
229 if (is_filtered_packet(sk, skb))
230 continue;
231 } else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
232 if (!bt_cb(skb)->incoming)
233 continue;
234 if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
235 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
236 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
237 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT)
238 continue;
239 } else {
240 /* Don't send frame to other channel types */
241 continue;
242 }
243
244 if (!skb_copy) {
245 /* Create a private copy with headroom */
246 skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
247 if (!skb_copy)
248 continue;
249
250 /* Put type byte before the data */
251 memcpy(skb_push(skb_copy, 1), &hci_skb_pkt_type(skb), 1);
252 }
253
254 nskb = skb_clone(skb_copy, GFP_ATOMIC);
255 if (!nskb)
256 continue;
257
258 if (sock_queue_rcv_skb(sk, nskb))
259 kfree_skb(nskb);
260 }
261
262 read_unlock(&hci_sk_list.lock);
263
264 kfree_skb(skb_copy);
265 }
266
267 /* Send frame to sockets with specific channel */
__hci_send_to_channel(unsigned short channel,struct sk_buff * skb,int flag,struct sock * skip_sk)268 static void __hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
269 int flag, struct sock *skip_sk)
270 {
271 struct sock *sk;
272
273 BT_DBG("channel %u len %d", channel, skb->len);
274
275 sk_for_each(sk, &hci_sk_list.head) {
276 struct sk_buff *nskb;
277
278 /* Ignore socket without the flag set */
279 if (!hci_sock_test_flag(sk, flag))
280 continue;
281
282 /* Skip the original socket */
283 if (sk == skip_sk)
284 continue;
285
286 if (sk->sk_state != BT_BOUND)
287 continue;
288
289 if (hci_pi(sk)->channel != channel)
290 continue;
291
292 nskb = skb_clone(skb, GFP_ATOMIC);
293 if (!nskb)
294 continue;
295
296 if (sock_queue_rcv_skb(sk, nskb))
297 kfree_skb(nskb);
298 }
299
300 }
301
hci_send_to_channel(unsigned short channel,struct sk_buff * skb,int flag,struct sock * skip_sk)302 void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
303 int flag, struct sock *skip_sk)
304 {
305 read_lock(&hci_sk_list.lock);
306 __hci_send_to_channel(channel, skb, flag, skip_sk);
307 read_unlock(&hci_sk_list.lock);
308 }
309
310 /* Send frame to monitor socket */
hci_send_to_monitor(struct hci_dev * hdev,struct sk_buff * skb)311 void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
312 {
313 struct sk_buff *skb_copy = NULL;
314 struct hci_mon_hdr *hdr;
315 __le16 opcode;
316
317 if (!atomic_read(&monitor_promisc))
318 return;
319
320 BT_DBG("hdev %p len %d", hdev, skb->len);
321
322 switch (hci_skb_pkt_type(skb)) {
323 case HCI_COMMAND_PKT:
324 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
325 break;
326 case HCI_EVENT_PKT:
327 opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
328 break;
329 case HCI_ACLDATA_PKT:
330 if (bt_cb(skb)->incoming)
331 opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
332 else
333 opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
334 break;
335 case HCI_SCODATA_PKT:
336 if (bt_cb(skb)->incoming)
337 opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
338 else
339 opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
340 break;
341 case HCI_ISODATA_PKT:
342 if (bt_cb(skb)->incoming)
343 opcode = cpu_to_le16(HCI_MON_ISO_RX_PKT);
344 else
345 opcode = cpu_to_le16(HCI_MON_ISO_TX_PKT);
346 break;
347 case HCI_DIAG_PKT:
348 opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG);
349 break;
350 default:
351 return;
352 }
353
354 /* Create a private copy with headroom */
355 skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE, GFP_ATOMIC, true);
356 if (!skb_copy)
357 return;
358
359 /* Put header before the data */
360 hdr = skb_push(skb_copy, HCI_MON_HDR_SIZE);
361 hdr->opcode = opcode;
362 hdr->index = cpu_to_le16(hdev->id);
363 hdr->len = cpu_to_le16(skb->len);
364
365 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
366 HCI_SOCK_TRUSTED, NULL);
367 kfree_skb(skb_copy);
368 }
369
hci_send_monitor_ctrl_event(struct hci_dev * hdev,u16 event,void * data,u16 data_len,ktime_t tstamp,int flag,struct sock * skip_sk)370 void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
371 void *data, u16 data_len, ktime_t tstamp,
372 int flag, struct sock *skip_sk)
373 {
374 struct sock *sk;
375 __le16 index;
376
377 if (hdev)
378 index = cpu_to_le16(hdev->id);
379 else
380 index = cpu_to_le16(MGMT_INDEX_NONE);
381
382 read_lock(&hci_sk_list.lock);
383
384 sk_for_each(sk, &hci_sk_list.head) {
385 struct hci_mon_hdr *hdr;
386 struct sk_buff *skb;
387
388 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
389 continue;
390
391 /* Ignore socket without the flag set */
392 if (!hci_sock_test_flag(sk, flag))
393 continue;
394
395 /* Skip the original socket */
396 if (sk == skip_sk)
397 continue;
398
399 skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC);
400 if (!skb)
401 continue;
402
403 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
404 put_unaligned_le16(event, skb_put(skb, 2));
405
406 if (data)
407 skb_put_data(skb, data, data_len);
408
409 skb->tstamp = tstamp;
410
411 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
412 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
413 hdr->index = index;
414 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
415
416 __hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
417 HCI_SOCK_TRUSTED, NULL);
418 kfree_skb(skb);
419 }
420
421 read_unlock(&hci_sk_list.lock);
422 }
423
create_monitor_event(struct hci_dev * hdev,int event)424 static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
425 {
426 struct hci_mon_hdr *hdr;
427 struct hci_mon_new_index *ni;
428 struct hci_mon_index_info *ii;
429 struct sk_buff *skb;
430 __le16 opcode;
431
432 switch (event) {
433 case HCI_DEV_REG:
434 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
435 if (!skb)
436 return NULL;
437
438 ni = skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
439 ni->type = hdev->dev_type;
440 ni->bus = hdev->bus;
441 bacpy(&ni->bdaddr, &hdev->bdaddr);
442 memcpy(ni->name, hdev->name, 8);
443
444 opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
445 break;
446
447 case HCI_DEV_UNREG:
448 skb = bt_skb_alloc(0, GFP_ATOMIC);
449 if (!skb)
450 return NULL;
451
452 opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
453 break;
454
455 case HCI_DEV_SETUP:
456 if (hdev->manufacturer == 0xffff)
457 return NULL;
458 fallthrough;
459
460 case HCI_DEV_UP:
461 skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
462 if (!skb)
463 return NULL;
464
465 ii = skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
466 bacpy(&ii->bdaddr, &hdev->bdaddr);
467 ii->manufacturer = cpu_to_le16(hdev->manufacturer);
468
469 opcode = cpu_to_le16(HCI_MON_INDEX_INFO);
470 break;
471
472 case HCI_DEV_OPEN:
473 skb = bt_skb_alloc(0, GFP_ATOMIC);
474 if (!skb)
475 return NULL;
476
477 opcode = cpu_to_le16(HCI_MON_OPEN_INDEX);
478 break;
479
480 case HCI_DEV_CLOSE:
481 skb = bt_skb_alloc(0, GFP_ATOMIC);
482 if (!skb)
483 return NULL;
484
485 opcode = cpu_to_le16(HCI_MON_CLOSE_INDEX);
486 break;
487
488 default:
489 return NULL;
490 }
491
492 __net_timestamp(skb);
493
494 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
495 hdr->opcode = opcode;
496 hdr->index = cpu_to_le16(hdev->id);
497 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
498
499 return skb;
500 }
501
create_monitor_ctrl_open(struct sock * sk)502 static struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
503 {
504 struct hci_mon_hdr *hdr;
505 struct sk_buff *skb;
506 u16 format;
507 u8 ver[3];
508 u32 flags;
509
510 /* No message needed when cookie is not present */
511 if (!hci_pi(sk)->cookie)
512 return NULL;
513
514 switch (hci_pi(sk)->channel) {
515 case HCI_CHANNEL_RAW:
516 format = 0x0000;
517 ver[0] = BT_SUBSYS_VERSION;
518 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
519 break;
520 case HCI_CHANNEL_USER:
521 format = 0x0001;
522 ver[0] = BT_SUBSYS_VERSION;
523 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
524 break;
525 case HCI_CHANNEL_CONTROL:
526 format = 0x0002;
527 mgmt_fill_version_info(ver);
528 break;
529 default:
530 /* No message for unsupported format */
531 return NULL;
532 }
533
534 skb = bt_skb_alloc(14 + TASK_COMM_LEN , GFP_ATOMIC);
535 if (!skb)
536 return NULL;
537
538 flags = hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) ? 0x1 : 0x0;
539
540 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
541 put_unaligned_le16(format, skb_put(skb, 2));
542 skb_put_data(skb, ver, sizeof(ver));
543 put_unaligned_le32(flags, skb_put(skb, 4));
544 skb_put_u8(skb, TASK_COMM_LEN);
545 skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN);
546
547 __net_timestamp(skb);
548
549 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
550 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_OPEN);
551 if (hci_pi(sk)->hdev)
552 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
553 else
554 hdr->index = cpu_to_le16(HCI_DEV_NONE);
555 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
556
557 return skb;
558 }
559
create_monitor_ctrl_close(struct sock * sk)560 static struct sk_buff *create_monitor_ctrl_close(struct sock *sk)
561 {
562 struct hci_mon_hdr *hdr;
563 struct sk_buff *skb;
564
565 /* No message needed when cookie is not present */
566 if (!hci_pi(sk)->cookie)
567 return NULL;
568
569 switch (hci_pi(sk)->channel) {
570 case HCI_CHANNEL_RAW:
571 case HCI_CHANNEL_USER:
572 case HCI_CHANNEL_CONTROL:
573 break;
574 default:
575 /* No message for unsupported format */
576 return NULL;
577 }
578
579 skb = bt_skb_alloc(4, GFP_ATOMIC);
580 if (!skb)
581 return NULL;
582
583 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
584
585 __net_timestamp(skb);
586
587 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
588 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_CLOSE);
589 if (hci_pi(sk)->hdev)
590 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
591 else
592 hdr->index = cpu_to_le16(HCI_DEV_NONE);
593 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
594
595 return skb;
596 }
597
create_monitor_ctrl_command(struct sock * sk,u16 index,u16 opcode,u16 len,const void * buf)598 static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index,
599 u16 opcode, u16 len,
600 const void *buf)
601 {
602 struct hci_mon_hdr *hdr;
603 struct sk_buff *skb;
604
605 skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
606 if (!skb)
607 return NULL;
608
609 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
610 put_unaligned_le16(opcode, skb_put(skb, 2));
611
612 if (buf)
613 skb_put_data(skb, buf, len);
614
615 __net_timestamp(skb);
616
617 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
618 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND);
619 hdr->index = cpu_to_le16(index);
620 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
621
622 return skb;
623 }
624
625 static void __printf(2, 3)
send_monitor_note(struct sock * sk,const char * fmt,...)626 send_monitor_note(struct sock *sk, const char *fmt, ...)
627 {
628 size_t len;
629 struct hci_mon_hdr *hdr;
630 struct sk_buff *skb;
631 va_list args;
632
633 va_start(args, fmt);
634 len = vsnprintf(NULL, 0, fmt, args);
635 va_end(args);
636
637 skb = bt_skb_alloc(len + 1, GFP_ATOMIC);
638 if (!skb)
639 return;
640
641 va_start(args, fmt);
642 vsprintf(skb_put(skb, len), fmt, args);
643 *(u8 *)skb_put(skb, 1) = 0;
644 va_end(args);
645
646 __net_timestamp(skb);
647
648 hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
649 hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE);
650 hdr->index = cpu_to_le16(HCI_DEV_NONE);
651 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
652
653 if (sock_queue_rcv_skb(sk, skb))
654 kfree_skb(skb);
655 }
656
send_monitor_replay(struct sock * sk)657 static void send_monitor_replay(struct sock *sk)
658 {
659 struct hci_dev *hdev;
660
661 read_lock(&hci_dev_list_lock);
662
663 list_for_each_entry(hdev, &hci_dev_list, list) {
664 struct sk_buff *skb;
665
666 skb = create_monitor_event(hdev, HCI_DEV_REG);
667 if (!skb)
668 continue;
669
670 if (sock_queue_rcv_skb(sk, skb))
671 kfree_skb(skb);
672
673 if (!test_bit(HCI_RUNNING, &hdev->flags))
674 continue;
675
676 skb = create_monitor_event(hdev, HCI_DEV_OPEN);
677 if (!skb)
678 continue;
679
680 if (sock_queue_rcv_skb(sk, skb))
681 kfree_skb(skb);
682
683 if (test_bit(HCI_UP, &hdev->flags))
684 skb = create_monitor_event(hdev, HCI_DEV_UP);
685 else if (hci_dev_test_flag(hdev, HCI_SETUP))
686 skb = create_monitor_event(hdev, HCI_DEV_SETUP);
687 else
688 skb = NULL;
689
690 if (skb) {
691 if (sock_queue_rcv_skb(sk, skb))
692 kfree_skb(skb);
693 }
694 }
695
696 read_unlock(&hci_dev_list_lock);
697 }
698
send_monitor_control_replay(struct sock * mon_sk)699 static void send_monitor_control_replay(struct sock *mon_sk)
700 {
701 struct sock *sk;
702
703 read_lock(&hci_sk_list.lock);
704
705 sk_for_each(sk, &hci_sk_list.head) {
706 struct sk_buff *skb;
707
708 skb = create_monitor_ctrl_open(sk);
709 if (!skb)
710 continue;
711
712 if (sock_queue_rcv_skb(mon_sk, skb))
713 kfree_skb(skb);
714 }
715
716 read_unlock(&hci_sk_list.lock);
717 }
718
719 /* Generate internal stack event */
hci_si_event(struct hci_dev * hdev,int type,int dlen,void * data)720 static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
721 {
722 struct hci_event_hdr *hdr;
723 struct hci_ev_stack_internal *ev;
724 struct sk_buff *skb;
725
726 skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
727 if (!skb)
728 return;
729
730 hdr = skb_put(skb, HCI_EVENT_HDR_SIZE);
731 hdr->evt = HCI_EV_STACK_INTERNAL;
732 hdr->plen = sizeof(*ev) + dlen;
733
734 ev = skb_put(skb, sizeof(*ev) + dlen);
735 ev->type = type;
736 memcpy(ev->data, data, dlen);
737
738 bt_cb(skb)->incoming = 1;
739 __net_timestamp(skb);
740
741 hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
742 hci_send_to_sock(hdev, skb);
743 kfree_skb(skb);
744 }
745
hci_sock_dev_event(struct hci_dev * hdev,int event)746 void hci_sock_dev_event(struct hci_dev *hdev, int event)
747 {
748 BT_DBG("hdev %s event %d", hdev->name, event);
749
750 if (atomic_read(&monitor_promisc)) {
751 struct sk_buff *skb;
752
753 /* Send event to monitor */
754 skb = create_monitor_event(hdev, event);
755 if (skb) {
756 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
757 HCI_SOCK_TRUSTED, NULL);
758 kfree_skb(skb);
759 }
760 }
761
762 if (event <= HCI_DEV_DOWN) {
763 struct hci_ev_si_device ev;
764
765 /* Send event to sockets */
766 ev.event = event;
767 ev.dev_id = hdev->id;
768 hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
769 }
770
771 if (event == HCI_DEV_UNREG) {
772 struct sock *sk;
773
774 /* Wake up sockets using this dead device */
775 read_lock(&hci_sk_list.lock);
776 sk_for_each(sk, &hci_sk_list.head) {
777 if (hci_pi(sk)->hdev == hdev) {
778 sk->sk_err = EPIPE;
779 sk->sk_state_change(sk);
780 }
781 }
782 read_unlock(&hci_sk_list.lock);
783 }
784 }
785
__hci_mgmt_chan_find(unsigned short channel)786 static struct hci_mgmt_chan *__hci_mgmt_chan_find(unsigned short channel)
787 {
788 struct hci_mgmt_chan *c;
789
790 list_for_each_entry(c, &mgmt_chan_list, list) {
791 if (c->channel == channel)
792 return c;
793 }
794
795 return NULL;
796 }
797
hci_mgmt_chan_find(unsigned short channel)798 static struct hci_mgmt_chan *hci_mgmt_chan_find(unsigned short channel)
799 {
800 struct hci_mgmt_chan *c;
801
802 mutex_lock(&mgmt_chan_list_lock);
803 c = __hci_mgmt_chan_find(channel);
804 mutex_unlock(&mgmt_chan_list_lock);
805
806 return c;
807 }
808
hci_mgmt_chan_register(struct hci_mgmt_chan * c)809 int hci_mgmt_chan_register(struct hci_mgmt_chan *c)
810 {
811 if (c->channel < HCI_CHANNEL_CONTROL)
812 return -EINVAL;
813
814 mutex_lock(&mgmt_chan_list_lock);
815 if (__hci_mgmt_chan_find(c->channel)) {
816 mutex_unlock(&mgmt_chan_list_lock);
817 return -EALREADY;
818 }
819
820 list_add_tail(&c->list, &mgmt_chan_list);
821
822 mutex_unlock(&mgmt_chan_list_lock);
823
824 return 0;
825 }
826 EXPORT_SYMBOL(hci_mgmt_chan_register);
827
hci_mgmt_chan_unregister(struct hci_mgmt_chan * c)828 void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c)
829 {
830 mutex_lock(&mgmt_chan_list_lock);
831 list_del(&c->list);
832 mutex_unlock(&mgmt_chan_list_lock);
833 }
834 EXPORT_SYMBOL(hci_mgmt_chan_unregister);
835
hci_sock_release(struct socket * sock)836 static int hci_sock_release(struct socket *sock)
837 {
838 struct sock *sk = sock->sk;
839 struct hci_dev *hdev;
840 struct sk_buff *skb;
841
842 BT_DBG("sock %p sk %p", sock, sk);
843
844 if (!sk)
845 return 0;
846
847 lock_sock(sk);
848
849 switch (hci_pi(sk)->channel) {
850 case HCI_CHANNEL_MONITOR:
851 atomic_dec(&monitor_promisc);
852 break;
853 case HCI_CHANNEL_RAW:
854 case HCI_CHANNEL_USER:
855 case HCI_CHANNEL_CONTROL:
856 /* Send event to monitor */
857 skb = create_monitor_ctrl_close(sk);
858 if (skb) {
859 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
860 HCI_SOCK_TRUSTED, NULL);
861 kfree_skb(skb);
862 }
863
864 hci_sock_free_cookie(sk);
865 break;
866 }
867
868 bt_sock_unlink(&hci_sk_list, sk);
869
870 hdev = hci_pi(sk)->hdev;
871 if (hdev) {
872 if (hci_pi(sk)->channel == HCI_CHANNEL_USER &&
873 !hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
874 /* When releasing a user channel exclusive access,
875 * call hci_dev_do_close directly instead of calling
876 * hci_dev_close to ensure the exclusive access will
877 * be released and the controller brought back down.
878 *
879 * The checking of HCI_AUTO_OFF is not needed in this
880 * case since it will have been cleared already when
881 * opening the user channel.
882 *
883 * Make sure to also check that we haven't already
884 * unregistered since all the cleanup will have already
885 * been complete and hdev will get released when we put
886 * below.
887 */
888 hci_dev_do_close(hdev);
889 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
890 mgmt_index_added(hdev);
891 }
892
893 atomic_dec(&hdev->promisc);
894 hci_dev_put(hdev);
895 }
896
897 sock_orphan(sk);
898 release_sock(sk);
899 sock_put(sk);
900 return 0;
901 }
902
hci_sock_reject_list_add(struct hci_dev * hdev,void __user * arg)903 static int hci_sock_reject_list_add(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_add(&hdev->reject_list, &bdaddr, BDADDR_BREDR);
914
915 hci_dev_unlock(hdev);
916
917 return err;
918 }
919
hci_sock_reject_list_del(struct hci_dev * hdev,void __user * arg)920 static int hci_sock_reject_list_del(struct hci_dev *hdev, void __user *arg)
921 {
922 bdaddr_t bdaddr;
923 int err;
924
925 if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
926 return -EFAULT;
927
928 hci_dev_lock(hdev);
929
930 err = hci_bdaddr_list_del(&hdev->reject_list, &bdaddr, BDADDR_BREDR);
931
932 hci_dev_unlock(hdev);
933
934 return err;
935 }
936
937 /* Ioctls that require bound socket */
hci_sock_bound_ioctl(struct sock * sk,unsigned int cmd,unsigned long arg)938 static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
939 unsigned long arg)
940 {
941 struct hci_dev *hdev = hci_hdev_from_sock(sk);
942
943 if (IS_ERR(hdev))
944 return PTR_ERR(hdev);
945
946 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
947 return -EBUSY;
948
949 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
950 return -EOPNOTSUPP;
951
952 if (hdev->dev_type != HCI_PRIMARY)
953 return -EOPNOTSUPP;
954
955 switch (cmd) {
956 case HCISETRAW:
957 if (!capable(CAP_NET_ADMIN))
958 return -EPERM;
959 return -EOPNOTSUPP;
960
961 case HCIGETCONNINFO:
962 return hci_get_conn_info(hdev, (void __user *)arg);
963
964 case HCIGETAUTHINFO:
965 return hci_get_auth_info(hdev, (void __user *)arg);
966
967 case HCIBLOCKADDR:
968 if (!capable(CAP_NET_ADMIN))
969 return -EPERM;
970 return hci_sock_reject_list_add(hdev, (void __user *)arg);
971
972 case HCIUNBLOCKADDR:
973 if (!capable(CAP_NET_ADMIN))
974 return -EPERM;
975 return hci_sock_reject_list_del(hdev, (void __user *)arg);
976 }
977
978 return -ENOIOCTLCMD;
979 }
980
hci_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)981 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
982 unsigned long arg)
983 {
984 void __user *argp = (void __user *)arg;
985 struct sock *sk = sock->sk;
986 int err;
987
988 BT_DBG("cmd %x arg %lx", cmd, arg);
989
990 lock_sock(sk);
991
992 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
993 err = -EBADFD;
994 goto done;
995 }
996
997 /* When calling an ioctl on an unbound raw socket, then ensure
998 * that the monitor gets informed. Ensure that the resulting event
999 * is only send once by checking if the cookie exists or not. The
1000 * socket cookie will be only ever generated once for the lifetime
1001 * of a given socket.
1002 */
1003 if (hci_sock_gen_cookie(sk)) {
1004 struct sk_buff *skb;
1005
1006 if (capable(CAP_NET_ADMIN))
1007 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1008
1009 /* Send event to monitor */
1010 skb = create_monitor_ctrl_open(sk);
1011 if (skb) {
1012 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1013 HCI_SOCK_TRUSTED, NULL);
1014 kfree_skb(skb);
1015 }
1016 }
1017
1018 release_sock(sk);
1019
1020 switch (cmd) {
1021 case HCIGETDEVLIST:
1022 return hci_get_dev_list(argp);
1023
1024 case HCIGETDEVINFO:
1025 return hci_get_dev_info(argp);
1026
1027 case HCIGETCONNLIST:
1028 return hci_get_conn_list(argp);
1029
1030 case HCIDEVUP:
1031 if (!capable(CAP_NET_ADMIN))
1032 return -EPERM;
1033 return hci_dev_open(arg);
1034
1035 case HCIDEVDOWN:
1036 if (!capable(CAP_NET_ADMIN))
1037 return -EPERM;
1038 return hci_dev_close(arg);
1039
1040 case HCIDEVRESET:
1041 if (!capable(CAP_NET_ADMIN))
1042 return -EPERM;
1043 return hci_dev_reset(arg);
1044
1045 case HCIDEVRESTAT:
1046 if (!capable(CAP_NET_ADMIN))
1047 return -EPERM;
1048 return hci_dev_reset_stat(arg);
1049
1050 case HCISETSCAN:
1051 case HCISETAUTH:
1052 case HCISETENCRYPT:
1053 case HCISETPTYPE:
1054 case HCISETLINKPOL:
1055 case HCISETLINKMODE:
1056 case HCISETACLMTU:
1057 case HCISETSCOMTU:
1058 if (!capable(CAP_NET_ADMIN))
1059 return -EPERM;
1060 return hci_dev_cmd(cmd, argp);
1061
1062 case HCIINQUIRY:
1063 return hci_inquiry(argp);
1064 }
1065
1066 lock_sock(sk);
1067
1068 err = hci_sock_bound_ioctl(sk, cmd, arg);
1069
1070 done:
1071 release_sock(sk);
1072 return err;
1073 }
1074
1075 #ifdef CONFIG_COMPAT
hci_sock_compat_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1076 static int hci_sock_compat_ioctl(struct socket *sock, unsigned int cmd,
1077 unsigned long arg)
1078 {
1079 switch (cmd) {
1080 case HCIDEVUP:
1081 case HCIDEVDOWN:
1082 case HCIDEVRESET:
1083 case HCIDEVRESTAT:
1084 return hci_sock_ioctl(sock, cmd, arg);
1085 }
1086
1087 return hci_sock_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1088 }
1089 #endif
1090
hci_sock_bind(struct socket * sock,struct sockaddr * addr,int addr_len)1091 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
1092 int addr_len)
1093 {
1094 struct sockaddr_hci haddr;
1095 struct sock *sk = sock->sk;
1096 struct hci_dev *hdev = NULL;
1097 struct sk_buff *skb;
1098 int len, err = 0;
1099
1100 BT_DBG("sock %p sk %p", sock, sk);
1101
1102 if (!addr)
1103 return -EINVAL;
1104
1105 memset(&haddr, 0, sizeof(haddr));
1106 len = min_t(unsigned int, sizeof(haddr), addr_len);
1107 memcpy(&haddr, addr, len);
1108
1109 if (haddr.hci_family != AF_BLUETOOTH)
1110 return -EINVAL;
1111
1112 lock_sock(sk);
1113
1114 /* Allow detaching from dead device and attaching to alive device, if
1115 * the caller wants to re-bind (instead of close) this socket in
1116 * response to hci_sock_dev_event(HCI_DEV_UNREG) notification.
1117 */
1118 hdev = hci_pi(sk)->hdev;
1119 if (hdev && hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
1120 hci_pi(sk)->hdev = NULL;
1121 sk->sk_state = BT_OPEN;
1122 hci_dev_put(hdev);
1123 }
1124 hdev = NULL;
1125
1126 if (sk->sk_state == BT_BOUND) {
1127 err = -EALREADY;
1128 goto done;
1129 }
1130
1131 switch (haddr.hci_channel) {
1132 case HCI_CHANNEL_RAW:
1133 if (hci_pi(sk)->hdev) {
1134 err = -EALREADY;
1135 goto done;
1136 }
1137
1138 if (haddr.hci_dev != HCI_DEV_NONE) {
1139 hdev = hci_dev_get(haddr.hci_dev);
1140 if (!hdev) {
1141 err = -ENODEV;
1142 goto done;
1143 }
1144
1145 atomic_inc(&hdev->promisc);
1146 }
1147
1148 hci_pi(sk)->channel = haddr.hci_channel;
1149
1150 if (!hci_sock_gen_cookie(sk)) {
1151 /* In the case when a cookie has already been assigned,
1152 * then there has been already an ioctl issued against
1153 * an unbound socket and with that triggered an open
1154 * notification. Send a close notification first to
1155 * allow the state transition to bounded.
1156 */
1157 skb = create_monitor_ctrl_close(sk);
1158 if (skb) {
1159 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1160 HCI_SOCK_TRUSTED, NULL);
1161 kfree_skb(skb);
1162 }
1163 }
1164
1165 if (capable(CAP_NET_ADMIN))
1166 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1167
1168 hci_pi(sk)->hdev = hdev;
1169
1170 /* Send event to monitor */
1171 skb = create_monitor_ctrl_open(sk);
1172 if (skb) {
1173 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1174 HCI_SOCK_TRUSTED, NULL);
1175 kfree_skb(skb);
1176 }
1177 break;
1178
1179 case HCI_CHANNEL_USER:
1180 if (hci_pi(sk)->hdev) {
1181 err = -EALREADY;
1182 goto done;
1183 }
1184
1185 if (haddr.hci_dev == HCI_DEV_NONE) {
1186 err = -EINVAL;
1187 goto done;
1188 }
1189
1190 if (!capable(CAP_NET_ADMIN)) {
1191 err = -EPERM;
1192 goto done;
1193 }
1194
1195 hdev = hci_dev_get(haddr.hci_dev);
1196 if (!hdev) {
1197 err = -ENODEV;
1198 goto done;
1199 }
1200
1201 if (test_bit(HCI_INIT, &hdev->flags) ||
1202 hci_dev_test_flag(hdev, HCI_SETUP) ||
1203 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1204 (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) &&
1205 test_bit(HCI_UP, &hdev->flags))) {
1206 err = -EBUSY;
1207 hci_dev_put(hdev);
1208 goto done;
1209 }
1210
1211 if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) {
1212 err = -EUSERS;
1213 hci_dev_put(hdev);
1214 goto done;
1215 }
1216
1217 mgmt_index_removed(hdev);
1218
1219 err = hci_dev_open(hdev->id);
1220 if (err) {
1221 if (err == -EALREADY) {
1222 /* In case the transport is already up and
1223 * running, clear the error here.
1224 *
1225 * This can happen when opening a user
1226 * channel and HCI_AUTO_OFF grace period
1227 * is still active.
1228 */
1229 err = 0;
1230 } else {
1231 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
1232 mgmt_index_added(hdev);
1233 hci_dev_put(hdev);
1234 goto done;
1235 }
1236 }
1237
1238 hci_pi(sk)->channel = haddr.hci_channel;
1239
1240 if (!hci_sock_gen_cookie(sk)) {
1241 /* In the case when a cookie has already been assigned,
1242 * this socket will transition from a raw socket into
1243 * a user channel socket. For a clean transition, send
1244 * the close notification first.
1245 */
1246 skb = create_monitor_ctrl_close(sk);
1247 if (skb) {
1248 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1249 HCI_SOCK_TRUSTED, NULL);
1250 kfree_skb(skb);
1251 }
1252 }
1253
1254 /* The user channel is restricted to CAP_NET_ADMIN
1255 * capabilities and with that implicitly trusted.
1256 */
1257 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1258
1259 hci_pi(sk)->hdev = hdev;
1260
1261 /* Send event to monitor */
1262 skb = create_monitor_ctrl_open(sk);
1263 if (skb) {
1264 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1265 HCI_SOCK_TRUSTED, NULL);
1266 kfree_skb(skb);
1267 }
1268
1269 atomic_inc(&hdev->promisc);
1270 break;
1271
1272 case HCI_CHANNEL_MONITOR:
1273 if (haddr.hci_dev != HCI_DEV_NONE) {
1274 err = -EINVAL;
1275 goto done;
1276 }
1277
1278 if (!capable(CAP_NET_RAW)) {
1279 err = -EPERM;
1280 goto done;
1281 }
1282
1283 hci_pi(sk)->channel = haddr.hci_channel;
1284
1285 /* The monitor interface is restricted to CAP_NET_RAW
1286 * capabilities and with that implicitly trusted.
1287 */
1288 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1289
1290 send_monitor_note(sk, "Linux version %s (%s)",
1291 init_utsname()->release,
1292 init_utsname()->machine);
1293 send_monitor_note(sk, "Bluetooth subsystem version %u.%u",
1294 BT_SUBSYS_VERSION, BT_SUBSYS_REVISION);
1295 send_monitor_replay(sk);
1296 send_monitor_control_replay(sk);
1297
1298 atomic_inc(&monitor_promisc);
1299 break;
1300
1301 case HCI_CHANNEL_LOGGING:
1302 if (haddr.hci_dev != HCI_DEV_NONE) {
1303 err = -EINVAL;
1304 goto done;
1305 }
1306
1307 if (!capable(CAP_NET_ADMIN)) {
1308 err = -EPERM;
1309 goto done;
1310 }
1311
1312 hci_pi(sk)->channel = haddr.hci_channel;
1313 break;
1314
1315 default:
1316 if (!hci_mgmt_chan_find(haddr.hci_channel)) {
1317 err = -EINVAL;
1318 goto done;
1319 }
1320
1321 if (haddr.hci_dev != HCI_DEV_NONE) {
1322 err = -EINVAL;
1323 goto done;
1324 }
1325
1326 /* Users with CAP_NET_ADMIN capabilities are allowed
1327 * access to all management commands and events. For
1328 * untrusted users the interface is restricted and
1329 * also only untrusted events are sent.
1330 */
1331 if (capable(CAP_NET_ADMIN))
1332 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1333
1334 hci_pi(sk)->channel = haddr.hci_channel;
1335
1336 /* At the moment the index and unconfigured index events
1337 * are enabled unconditionally. Setting them on each
1338 * socket when binding keeps this functionality. They
1339 * however might be cleared later and then sending of these
1340 * events will be disabled, but that is then intentional.
1341 *
1342 * This also enables generic events that are safe to be
1343 * received by untrusted users. Example for such events
1344 * are changes to settings, class of device, name etc.
1345 */
1346 if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) {
1347 if (!hci_sock_gen_cookie(sk)) {
1348 /* In the case when a cookie has already been
1349 * assigned, this socket will transition from
1350 * a raw socket into a control socket. To
1351 * allow for a clean transition, send the
1352 * close notification first.
1353 */
1354 skb = create_monitor_ctrl_close(sk);
1355 if (skb) {
1356 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1357 HCI_SOCK_TRUSTED, NULL);
1358 kfree_skb(skb);
1359 }
1360 }
1361
1362 /* Send event to monitor */
1363 skb = create_monitor_ctrl_open(sk);
1364 if (skb) {
1365 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1366 HCI_SOCK_TRUSTED, NULL);
1367 kfree_skb(skb);
1368 }
1369
1370 hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS);
1371 hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);
1372 hci_sock_set_flag(sk, HCI_MGMT_OPTION_EVENTS);
1373 hci_sock_set_flag(sk, HCI_MGMT_SETTING_EVENTS);
1374 hci_sock_set_flag(sk, HCI_MGMT_DEV_CLASS_EVENTS);
1375 hci_sock_set_flag(sk, HCI_MGMT_LOCAL_NAME_EVENTS);
1376 }
1377 break;
1378 }
1379
1380 /* Default MTU to HCI_MAX_FRAME_SIZE if not set */
1381 if (!hci_pi(sk)->mtu)
1382 hci_pi(sk)->mtu = HCI_MAX_FRAME_SIZE;
1383
1384 sk->sk_state = BT_BOUND;
1385
1386 done:
1387 release_sock(sk);
1388 return err;
1389 }
1390
hci_sock_getname(struct socket * sock,struct sockaddr * addr,int peer)1391 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
1392 int peer)
1393 {
1394 struct sockaddr_hci *haddr = (struct sockaddr_hci *)addr;
1395 struct sock *sk = sock->sk;
1396 struct hci_dev *hdev;
1397 int err = 0;
1398
1399 BT_DBG("sock %p sk %p", sock, sk);
1400
1401 if (peer)
1402 return -EOPNOTSUPP;
1403
1404 lock_sock(sk);
1405
1406 hdev = hci_hdev_from_sock(sk);
1407 if (IS_ERR(hdev)) {
1408 err = PTR_ERR(hdev);
1409 goto done;
1410 }
1411
1412 haddr->hci_family = AF_BLUETOOTH;
1413 haddr->hci_dev = hdev->id;
1414 haddr->hci_channel= hci_pi(sk)->channel;
1415 err = sizeof(*haddr);
1416
1417 done:
1418 release_sock(sk);
1419 return err;
1420 }
1421
hci_sock_cmsg(struct sock * sk,struct msghdr * msg,struct sk_buff * skb)1422 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
1423 struct sk_buff *skb)
1424 {
1425 __u8 mask = hci_pi(sk)->cmsg_mask;
1426
1427 if (mask & HCI_CMSG_DIR) {
1428 int incoming = bt_cb(skb)->incoming;
1429 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
1430 &incoming);
1431 }
1432
1433 if (mask & HCI_CMSG_TSTAMP) {
1434 #ifdef CONFIG_COMPAT
1435 struct old_timeval32 ctv;
1436 #endif
1437 struct __kernel_old_timeval tv;
1438 void *data;
1439 int len;
1440
1441 skb_get_timestamp(skb, &tv);
1442
1443 data = &tv;
1444 len = sizeof(tv);
1445 #ifdef CONFIG_COMPAT
1446 if (!COMPAT_USE_64BIT_TIME &&
1447 (msg->msg_flags & MSG_CMSG_COMPAT)) {
1448 ctv.tv_sec = tv.tv_sec;
1449 ctv.tv_usec = tv.tv_usec;
1450 data = &ctv;
1451 len = sizeof(ctv);
1452 }
1453 #endif
1454
1455 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
1456 }
1457 }
1458
hci_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)1459 static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1460 size_t len, int flags)
1461 {
1462 struct sock *sk = sock->sk;
1463 struct sk_buff *skb;
1464 int copied, err;
1465 unsigned int skblen;
1466
1467 BT_DBG("sock %p, sk %p", sock, sk);
1468
1469 if (flags & MSG_OOB)
1470 return -EOPNOTSUPP;
1471
1472 if (hci_pi(sk)->channel == HCI_CHANNEL_LOGGING)
1473 return -EOPNOTSUPP;
1474
1475 if (sk->sk_state == BT_CLOSED)
1476 return 0;
1477
1478 skb = skb_recv_datagram(sk, flags, &err);
1479 if (!skb)
1480 return err;
1481
1482 skblen = skb->len;
1483 copied = skb->len;
1484 if (len < copied) {
1485 msg->msg_flags |= MSG_TRUNC;
1486 copied = len;
1487 }
1488
1489 skb_reset_transport_header(skb);
1490 err = skb_copy_datagram_msg(skb, 0, msg, copied);
1491
1492 switch (hci_pi(sk)->channel) {
1493 case HCI_CHANNEL_RAW:
1494 hci_sock_cmsg(sk, msg, skb);
1495 break;
1496 case HCI_CHANNEL_USER:
1497 case HCI_CHANNEL_MONITOR:
1498 sock_recv_timestamp(msg, sk, skb);
1499 break;
1500 default:
1501 if (hci_mgmt_chan_find(hci_pi(sk)->channel))
1502 sock_recv_timestamp(msg, sk, skb);
1503 break;
1504 }
1505
1506 skb_free_datagram(sk, skb);
1507
1508 if (flags & MSG_TRUNC)
1509 copied = skblen;
1510
1511 return err ? : copied;
1512 }
1513
hci_mgmt_cmd(struct hci_mgmt_chan * chan,struct sock * sk,struct sk_buff * skb)1514 static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
1515 struct sk_buff *skb)
1516 {
1517 u8 *cp;
1518 struct mgmt_hdr *hdr;
1519 u16 opcode, index, len;
1520 struct hci_dev *hdev = NULL;
1521 const struct hci_mgmt_handler *handler;
1522 bool var_len, no_hdev;
1523 int err;
1524
1525 BT_DBG("got %d bytes", skb->len);
1526
1527 if (skb->len < sizeof(*hdr))
1528 return -EINVAL;
1529
1530 hdr = (void *)skb->data;
1531 opcode = __le16_to_cpu(hdr->opcode);
1532 index = __le16_to_cpu(hdr->index);
1533 len = __le16_to_cpu(hdr->len);
1534
1535 if (len != skb->len - sizeof(*hdr)) {
1536 err = -EINVAL;
1537 goto done;
1538 }
1539
1540 if (chan->channel == HCI_CHANNEL_CONTROL) {
1541 struct sk_buff *cmd;
1542
1543 /* Send event to monitor */
1544 cmd = create_monitor_ctrl_command(sk, index, opcode, len,
1545 skb->data + sizeof(*hdr));
1546 if (cmd) {
1547 hci_send_to_channel(HCI_CHANNEL_MONITOR, cmd,
1548 HCI_SOCK_TRUSTED, NULL);
1549 kfree_skb(cmd);
1550 }
1551 }
1552
1553 if (opcode >= chan->handler_count ||
1554 chan->handlers[opcode].func == NULL) {
1555 BT_DBG("Unknown op %u", opcode);
1556 err = mgmt_cmd_status(sk, index, opcode,
1557 MGMT_STATUS_UNKNOWN_COMMAND);
1558 goto done;
1559 }
1560
1561 handler = &chan->handlers[opcode];
1562
1563 if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
1564 !(handler->flags & HCI_MGMT_UNTRUSTED)) {
1565 err = mgmt_cmd_status(sk, index, opcode,
1566 MGMT_STATUS_PERMISSION_DENIED);
1567 goto done;
1568 }
1569
1570 if (index != MGMT_INDEX_NONE) {
1571 hdev = hci_dev_get(index);
1572 if (!hdev) {
1573 err = mgmt_cmd_status(sk, index, opcode,
1574 MGMT_STATUS_INVALID_INDEX);
1575 goto done;
1576 }
1577
1578 if (hci_dev_test_flag(hdev, HCI_SETUP) ||
1579 hci_dev_test_flag(hdev, HCI_CONFIG) ||
1580 hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1581 err = mgmt_cmd_status(sk, index, opcode,
1582 MGMT_STATUS_INVALID_INDEX);
1583 goto done;
1584 }
1585
1586 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1587 !(handler->flags & HCI_MGMT_UNCONFIGURED)) {
1588 err = mgmt_cmd_status(sk, index, opcode,
1589 MGMT_STATUS_INVALID_INDEX);
1590 goto done;
1591 }
1592 }
1593
1594 if (!(handler->flags & HCI_MGMT_HDEV_OPTIONAL)) {
1595 no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
1596 if (no_hdev != !hdev) {
1597 err = mgmt_cmd_status(sk, index, opcode,
1598 MGMT_STATUS_INVALID_INDEX);
1599 goto done;
1600 }
1601 }
1602
1603 var_len = (handler->flags & HCI_MGMT_VAR_LEN);
1604 if ((var_len && len < handler->data_len) ||
1605 (!var_len && len != handler->data_len)) {
1606 err = mgmt_cmd_status(sk, index, opcode,
1607 MGMT_STATUS_INVALID_PARAMS);
1608 goto done;
1609 }
1610
1611 if (hdev && chan->hdev_init)
1612 chan->hdev_init(sk, hdev);
1613
1614 cp = skb->data + sizeof(*hdr);
1615
1616 err = handler->func(sk, hdev, cp, len);
1617 if (err < 0)
1618 goto done;
1619
1620 err = skb->len;
1621
1622 done:
1623 if (hdev)
1624 hci_dev_put(hdev);
1625
1626 return err;
1627 }
1628
hci_logging_frame(struct sock * sk,struct sk_buff * skb,unsigned int flags)1629 static int hci_logging_frame(struct sock *sk, struct sk_buff *skb,
1630 unsigned int flags)
1631 {
1632 struct hci_mon_hdr *hdr;
1633 struct hci_dev *hdev;
1634 u16 index;
1635 int err;
1636
1637 /* The logging frame consists at minimum of the standard header,
1638 * the priority byte, the ident length byte and at least one string
1639 * terminator NUL byte. Anything shorter are invalid packets.
1640 */
1641 if (skb->len < sizeof(*hdr) + 3)
1642 return -EINVAL;
1643
1644 hdr = (void *)skb->data;
1645
1646 if (__le16_to_cpu(hdr->len) != skb->len - sizeof(*hdr))
1647 return -EINVAL;
1648
1649 if (__le16_to_cpu(hdr->opcode) == 0x0000) {
1650 __u8 priority = skb->data[sizeof(*hdr)];
1651 __u8 ident_len = skb->data[sizeof(*hdr) + 1];
1652
1653 /* Only the priorities 0-7 are valid and with that any other
1654 * value results in an invalid packet.
1655 *
1656 * The priority byte is followed by an ident length byte and
1657 * the NUL terminated ident string. Check that the ident
1658 * length is not overflowing the packet and also that the
1659 * ident string itself is NUL terminated. In case the ident
1660 * length is zero, the length value actually doubles as NUL
1661 * terminator identifier.
1662 *
1663 * The message follows the ident string (if present) and
1664 * must be NUL terminated. Otherwise it is not a valid packet.
1665 */
1666 if (priority > 7 || skb->data[skb->len - 1] != 0x00 ||
1667 ident_len > skb->len - sizeof(*hdr) - 3 ||
1668 skb->data[sizeof(*hdr) + ident_len + 1] != 0x00)
1669 return -EINVAL;
1670 } else {
1671 return -EINVAL;
1672 }
1673
1674 index = __le16_to_cpu(hdr->index);
1675
1676 if (index != MGMT_INDEX_NONE) {
1677 hdev = hci_dev_get(index);
1678 if (!hdev)
1679 return -ENODEV;
1680 } else {
1681 hdev = NULL;
1682 }
1683
1684 hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING);
1685
1686 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL);
1687 err = skb->len;
1688
1689 if (hdev)
1690 hci_dev_put(hdev);
1691
1692 return err;
1693 }
1694
hci_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1695 static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1696 size_t len)
1697 {
1698 struct sock *sk = sock->sk;
1699 struct hci_mgmt_chan *chan;
1700 struct hci_dev *hdev;
1701 struct sk_buff *skb;
1702 int err;
1703 const unsigned int flags = msg->msg_flags;
1704
1705 BT_DBG("sock %p sk %p", sock, sk);
1706
1707 if (flags & MSG_OOB)
1708 return -EOPNOTSUPP;
1709
1710 if (flags & ~(MSG_DONTWAIT | MSG_NOSIGNAL | MSG_ERRQUEUE | MSG_CMSG_COMPAT))
1711 return -EINVAL;
1712
1713 if (len < 4 || len > hci_pi(sk)->mtu)
1714 return -EINVAL;
1715
1716 skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0);
1717 if (IS_ERR(skb))
1718 return PTR_ERR(skb);
1719
1720 lock_sock(sk);
1721
1722 switch (hci_pi(sk)->channel) {
1723 case HCI_CHANNEL_RAW:
1724 case HCI_CHANNEL_USER:
1725 break;
1726 case HCI_CHANNEL_MONITOR:
1727 err = -EOPNOTSUPP;
1728 goto drop;
1729 case HCI_CHANNEL_LOGGING:
1730 err = hci_logging_frame(sk, skb, flags);
1731 goto drop;
1732 default:
1733 mutex_lock(&mgmt_chan_list_lock);
1734 chan = __hci_mgmt_chan_find(hci_pi(sk)->channel);
1735 if (chan)
1736 err = hci_mgmt_cmd(chan, sk, skb);
1737 else
1738 err = -EINVAL;
1739
1740 mutex_unlock(&mgmt_chan_list_lock);
1741 goto drop;
1742 }
1743
1744 hdev = hci_hdev_from_sock(sk);
1745 if (IS_ERR(hdev)) {
1746 err = PTR_ERR(hdev);
1747 goto drop;
1748 }
1749
1750 if (!test_bit(HCI_UP, &hdev->flags)) {
1751 err = -ENETDOWN;
1752 goto drop;
1753 }
1754
1755 hci_skb_pkt_type(skb) = skb->data[0];
1756 skb_pull(skb, 1);
1757
1758 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
1759 /* No permission check is needed for user channel
1760 * since that gets enforced when binding the socket.
1761 *
1762 * However check that the packet type is valid.
1763 */
1764 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
1765 hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1766 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
1767 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) {
1768 err = -EINVAL;
1769 goto drop;
1770 }
1771
1772 skb_queue_tail(&hdev->raw_q, skb);
1773 queue_work(hdev->workqueue, &hdev->tx_work);
1774 } else if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
1775 u16 opcode = get_unaligned_le16(skb->data);
1776 u16 ogf = hci_opcode_ogf(opcode);
1777 u16 ocf = hci_opcode_ocf(opcode);
1778
1779 if (((ogf > HCI_SFLT_MAX_OGF) ||
1780 !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
1781 &hci_sec_filter.ocf_mask[ogf])) &&
1782 !capable(CAP_NET_RAW)) {
1783 err = -EPERM;
1784 goto drop;
1785 }
1786
1787 /* Since the opcode has already been extracted here, store
1788 * a copy of the value for later use by the drivers.
1789 */
1790 hci_skb_opcode(skb) = opcode;
1791
1792 if (ogf == 0x3f) {
1793 skb_queue_tail(&hdev->raw_q, skb);
1794 queue_work(hdev->workqueue, &hdev->tx_work);
1795 } else {
1796 /* Stand-alone HCI commands must be flagged as
1797 * single-command requests.
1798 */
1799 bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
1800
1801 skb_queue_tail(&hdev->cmd_q, skb);
1802 queue_work(hdev->workqueue, &hdev->cmd_work);
1803 }
1804 } else {
1805 if (!capable(CAP_NET_RAW)) {
1806 err = -EPERM;
1807 goto drop;
1808 }
1809
1810 if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1811 hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
1812 hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) {
1813 err = -EINVAL;
1814 goto drop;
1815 }
1816
1817 skb_queue_tail(&hdev->raw_q, skb);
1818 queue_work(hdev->workqueue, &hdev->tx_work);
1819 }
1820
1821 err = len;
1822
1823 done:
1824 release_sock(sk);
1825 return err;
1826
1827 drop:
1828 kfree_skb(skb);
1829 goto done;
1830 }
1831
hci_sock_setsockopt_old(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int len)1832 static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
1833 sockptr_t optval, unsigned int len)
1834 {
1835 struct hci_ufilter uf = { .opcode = 0 };
1836 struct sock *sk = sock->sk;
1837 int err = 0, opt = 0;
1838
1839 BT_DBG("sk %p, opt %d", sk, optname);
1840
1841 lock_sock(sk);
1842
1843 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1844 err = -EBADFD;
1845 goto done;
1846 }
1847
1848 switch (optname) {
1849 case HCI_DATA_DIR:
1850 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1851 err = -EFAULT;
1852 break;
1853 }
1854
1855 if (opt)
1856 hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1857 else
1858 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1859 break;
1860
1861 case HCI_TIME_STAMP:
1862 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1863 err = -EFAULT;
1864 break;
1865 }
1866
1867 if (opt)
1868 hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1869 else
1870 hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1871 break;
1872
1873 case HCI_FILTER:
1874 {
1875 struct hci_filter *f = &hci_pi(sk)->filter;
1876
1877 uf.type_mask = f->type_mask;
1878 uf.opcode = f->opcode;
1879 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1880 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1881 }
1882
1883 len = min_t(unsigned int, len, sizeof(uf));
1884 if (copy_from_sockptr(&uf, optval, len)) {
1885 err = -EFAULT;
1886 break;
1887 }
1888
1889 if (!capable(CAP_NET_RAW)) {
1890 uf.type_mask &= hci_sec_filter.type_mask;
1891 uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1892 uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1893 }
1894
1895 {
1896 struct hci_filter *f = &hci_pi(sk)->filter;
1897
1898 f->type_mask = uf.type_mask;
1899 f->opcode = uf.opcode;
1900 *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1901 *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1902 }
1903 break;
1904
1905 default:
1906 err = -ENOPROTOOPT;
1907 break;
1908 }
1909
1910 done:
1911 release_sock(sk);
1912 return err;
1913 }
1914
hci_sock_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int len)1915 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1916 sockptr_t optval, unsigned int len)
1917 {
1918 struct sock *sk = sock->sk;
1919 int err = 0;
1920 u16 opt;
1921
1922 BT_DBG("sk %p, opt %d", sk, optname);
1923
1924 if (level == SOL_HCI)
1925 return hci_sock_setsockopt_old(sock, level, optname, optval,
1926 len);
1927
1928 if (level != SOL_BLUETOOTH)
1929 return -ENOPROTOOPT;
1930
1931 lock_sock(sk);
1932
1933 switch (optname) {
1934 case BT_SNDMTU:
1935 case BT_RCVMTU:
1936 switch (hci_pi(sk)->channel) {
1937 /* Don't allow changing MTU for channels that are meant for HCI
1938 * traffic only.
1939 */
1940 case HCI_CHANNEL_RAW:
1941 case HCI_CHANNEL_USER:
1942 err = -ENOPROTOOPT;
1943 goto done;
1944 }
1945
1946 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1947 err = -EFAULT;
1948 break;
1949 }
1950
1951 hci_pi(sk)->mtu = opt;
1952 break;
1953
1954 default:
1955 err = -ENOPROTOOPT;
1956 break;
1957 }
1958
1959 done:
1960 release_sock(sk);
1961 return err;
1962 }
1963
hci_sock_getsockopt_old(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)1964 static int hci_sock_getsockopt_old(struct socket *sock, int level, int optname,
1965 char __user *optval, int __user *optlen)
1966 {
1967 struct hci_ufilter uf;
1968 struct sock *sk = sock->sk;
1969 int len, opt, err = 0;
1970
1971 BT_DBG("sk %p, opt %d", sk, optname);
1972
1973 if (get_user(len, optlen))
1974 return -EFAULT;
1975
1976 lock_sock(sk);
1977
1978 if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1979 err = -EBADFD;
1980 goto done;
1981 }
1982
1983 switch (optname) {
1984 case HCI_DATA_DIR:
1985 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1986 opt = 1;
1987 else
1988 opt = 0;
1989
1990 if (put_user(opt, optval))
1991 err = -EFAULT;
1992 break;
1993
1994 case HCI_TIME_STAMP:
1995 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1996 opt = 1;
1997 else
1998 opt = 0;
1999
2000 if (put_user(opt, optval))
2001 err = -EFAULT;
2002 break;
2003
2004 case HCI_FILTER:
2005 {
2006 struct hci_filter *f = &hci_pi(sk)->filter;
2007
2008 memset(&uf, 0, sizeof(uf));
2009 uf.type_mask = f->type_mask;
2010 uf.opcode = f->opcode;
2011 uf.event_mask[0] = *((u32 *) f->event_mask + 0);
2012 uf.event_mask[1] = *((u32 *) f->event_mask + 1);
2013 }
2014
2015 len = min_t(unsigned int, len, sizeof(uf));
2016 if (copy_to_user(optval, &uf, len))
2017 err = -EFAULT;
2018 break;
2019
2020 default:
2021 err = -ENOPROTOOPT;
2022 break;
2023 }
2024
2025 done:
2026 release_sock(sk);
2027 return err;
2028 }
2029
hci_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)2030 static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
2031 char __user *optval, int __user *optlen)
2032 {
2033 struct sock *sk = sock->sk;
2034 int err = 0;
2035
2036 BT_DBG("sk %p, opt %d", sk, optname);
2037
2038 if (level == SOL_HCI)
2039 return hci_sock_getsockopt_old(sock, level, optname, optval,
2040 optlen);
2041
2042 if (level != SOL_BLUETOOTH)
2043 return -ENOPROTOOPT;
2044
2045 lock_sock(sk);
2046
2047 switch (optname) {
2048 case BT_SNDMTU:
2049 case BT_RCVMTU:
2050 if (put_user(hci_pi(sk)->mtu, (u16 __user *)optval))
2051 err = -EFAULT;
2052 break;
2053
2054 default:
2055 err = -ENOPROTOOPT;
2056 break;
2057 }
2058
2059 release_sock(sk);
2060 return err;
2061 }
2062
hci_sock_destruct(struct sock * sk)2063 static void hci_sock_destruct(struct sock *sk)
2064 {
2065 mgmt_cleanup(sk);
2066 skb_queue_purge(&sk->sk_receive_queue);
2067 skb_queue_purge(&sk->sk_write_queue);
2068 }
2069
2070 static const struct proto_ops hci_sock_ops = {
2071 .family = PF_BLUETOOTH,
2072 .owner = THIS_MODULE,
2073 .release = hci_sock_release,
2074 .bind = hci_sock_bind,
2075 .getname = hci_sock_getname,
2076 .sendmsg = hci_sock_sendmsg,
2077 .recvmsg = hci_sock_recvmsg,
2078 .ioctl = hci_sock_ioctl,
2079 #ifdef CONFIG_COMPAT
2080 .compat_ioctl = hci_sock_compat_ioctl,
2081 #endif
2082 .poll = datagram_poll,
2083 .listen = sock_no_listen,
2084 .shutdown = sock_no_shutdown,
2085 .setsockopt = hci_sock_setsockopt,
2086 .getsockopt = hci_sock_getsockopt,
2087 .connect = sock_no_connect,
2088 .socketpair = sock_no_socketpair,
2089 .accept = sock_no_accept,
2090 .mmap = sock_no_mmap
2091 };
2092
2093 static struct proto hci_sk_proto = {
2094 .name = "HCI",
2095 .owner = THIS_MODULE,
2096 .obj_size = sizeof(struct hci_pinfo)
2097 };
2098
hci_sock_create(struct net * net,struct socket * sock,int protocol,int kern)2099 static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
2100 int kern)
2101 {
2102 struct sock *sk;
2103
2104 BT_DBG("sock %p", sock);
2105
2106 if (sock->type != SOCK_RAW)
2107 return -ESOCKTNOSUPPORT;
2108
2109 sock->ops = &hci_sock_ops;
2110
2111 sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, kern);
2112 if (!sk)
2113 return -ENOMEM;
2114
2115 sock_init_data(sock, sk);
2116
2117 sock_reset_flag(sk, SOCK_ZAPPED);
2118
2119 sk->sk_protocol = protocol;
2120
2121 sock->state = SS_UNCONNECTED;
2122 sk->sk_state = BT_OPEN;
2123 sk->sk_destruct = hci_sock_destruct;
2124
2125 bt_sock_link(&hci_sk_list, sk);
2126 return 0;
2127 }
2128
2129 static const struct net_proto_family hci_sock_family_ops = {
2130 .family = PF_BLUETOOTH,
2131 .owner = THIS_MODULE,
2132 .create = hci_sock_create,
2133 };
2134
hci_sock_init(void)2135 int __init hci_sock_init(void)
2136 {
2137 int err;
2138
2139 BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr));
2140
2141 err = proto_register(&hci_sk_proto, 0);
2142 if (err < 0)
2143 return err;
2144
2145 err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
2146 if (err < 0) {
2147 BT_ERR("HCI socket registration failed");
2148 goto error;
2149 }
2150
2151 err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
2152 if (err < 0) {
2153 BT_ERR("Failed to create HCI proc file");
2154 bt_sock_unregister(BTPROTO_HCI);
2155 goto error;
2156 }
2157
2158 BT_INFO("HCI socket layer initialized");
2159
2160 return 0;
2161
2162 error:
2163 proto_unregister(&hci_sk_proto);
2164 return err;
2165 }
2166
hci_sock_cleanup(void)2167 void hci_sock_cleanup(void)
2168 {
2169 bt_procfs_cleanup(&init_net, "hci");
2170 bt_sock_unregister(BTPROTO_HCI);
2171 proto_unregister(&hci_sk_proto);
2172 }
2173