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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / net / bluetooth / hci_conn.c
blobc1c597e3e198e9ffba26dd4dcf2e59e2ffc923c3
1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
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 connection handling. */
26
27 #include <linux/module.h>
28
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/poll.h>
34 #include <linux/fcntl.h>
35 #include <linux/init.h>
36 #include <linux/skbuff.h>
37 #include <linux/interrupt.h>
38 #include <linux/notifier.h>
39 #include <net/sock.h>
40
41 #include <asm/system.h>
42 #include <linux/uaccess.h>
43 #include <asm/unaligned.h>
44
45 #include <net/bluetooth/bluetooth.h>
46 #include <net/bluetooth/hci_core.h>
47
48 static void hci_le_connect(struct hci_conn *conn)
49 {
50 struct hci_dev *hdev = conn->hdev;
51 struct hci_cp_le_create_conn cp;
52
53 conn->state = BT_CONNECT;
54 conn->out = 1;
55 conn->link_mode |= HCI_LM_MASTER;
56 conn->sec_level = BT_SECURITY_LOW;
57
58 memset(&cp, 0, sizeof(cp));
59 cp.scan_interval = cpu_to_le16(0x0060);
60 cp.scan_window = cpu_to_le16(0x0030);
61 bacpy(&cp.peer_addr, &conn->dst);
62 cp.peer_addr_type = conn->dst_type;
63 cp.conn_interval_min = cpu_to_le16(0x0028);
64 cp.conn_interval_max = cpu_to_le16(0x0038);
65 cp.supervision_timeout = cpu_to_le16(0x002a);
66 cp.min_ce_len = cpu_to_le16(0x0000);
67 cp.max_ce_len = cpu_to_le16(0x0000);
68
69 hci_send_cmd(hdev, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
70 }
71
72 static void hci_le_connect_cancel(struct hci_conn *conn)
73 {
74 hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
75 }
76
77 void hci_acl_connect(struct hci_conn *conn)
78 {
79 struct hci_dev *hdev = conn->hdev;
80 struct inquiry_entry *ie;
81 struct hci_cp_create_conn cp;
82
83 BT_DBG("%p", conn);
84
85 conn->state = BT_CONNECT;
86 conn->out = 1;
87
88 conn->link_mode = HCI_LM_MASTER;
89
90 conn->attempt++;
91
92 conn->link_policy = hdev->link_policy;
93
94 memset(&cp, 0, sizeof(cp));
95 bacpy(&cp.bdaddr, &conn->dst);
96 cp.pscan_rep_mode = 0x02;
97
98 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
99 if (ie) {
100 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
101 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
102 cp.pscan_mode = ie->data.pscan_mode;
103 cp.clock_offset = ie->data.clock_offset |
104 cpu_to_le16(0x8000);
105 }
106
107 memcpy(conn->dev_class, ie->data.dev_class, 3);
108 conn->ssp_mode = ie->data.ssp_mode;
109 }
110
111 cp.pkt_type = cpu_to_le16(conn->pkt_type);
112 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
113 cp.role_switch = 0x01;
114 else
115 cp.role_switch = 0x00;
116
117 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
118 }
119
120 static void hci_acl_connect_cancel(struct hci_conn *conn)
121 {
122 struct hci_cp_create_conn_cancel cp;
123
124 BT_DBG("%p", conn);
125
126 if (conn->hdev->hci_ver < 2)
127 return;
128
129 bacpy(&cp.bdaddr, &conn->dst);
130 hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
131 }
132
133 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
134 {
135 struct hci_cp_disconnect cp;
136
137 BT_DBG("%p", conn);
138
139 conn->state = BT_DISCONN;
140
141 cp.handle = cpu_to_le16(conn->handle);
142 cp.reason = reason;
143 hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
144 }
145
146 void hci_add_sco(struct hci_conn *conn, __u16 handle)
147 {
148 struct hci_dev *hdev = conn->hdev;
149 struct hci_cp_add_sco cp;
150
151 BT_DBG("%p", conn);
152
153 conn->state = BT_CONNECT;
154 conn->out = 1;
155
156 conn->attempt++;
157
158 cp.handle = cpu_to_le16(handle);
159 cp.pkt_type = cpu_to_le16(conn->pkt_type);
160
161 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
162 }
163
164 void hci_setup_sync(struct hci_conn *conn, __u16 handle)
165 {
166 struct hci_dev *hdev = conn->hdev;
167 struct hci_cp_setup_sync_conn cp;
168
169 BT_DBG("%p", conn);
170
171 conn->state = BT_CONNECT;
172 conn->out = 1;
173
174 conn->attempt++;
175
176 cp.handle = cpu_to_le16(handle);
177 cp.pkt_type = cpu_to_le16(conn->pkt_type);
178
179 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
180 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
181 cp.max_latency = cpu_to_le16(0xffff);
182 cp.voice_setting = cpu_to_le16(hdev->voice_setting);
183 cp.retrans_effort = 0xff;
184
185 hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp);
186 }
187
188 void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max,
189 u16 latency, u16 to_multiplier)
190 {
191 struct hci_cp_le_conn_update cp;
192 struct hci_dev *hdev = conn->hdev;
193
194 memset(&cp, 0, sizeof(cp));
195
196 cp.handle = cpu_to_le16(conn->handle);
197 cp.conn_interval_min = cpu_to_le16(min);
198 cp.conn_interval_max = cpu_to_le16(max);
199 cp.conn_latency = cpu_to_le16(latency);
200 cp.supervision_timeout = cpu_to_le16(to_multiplier);
201 cp.min_ce_len = cpu_to_le16(0x0001);
202 cp.max_ce_len = cpu_to_le16(0x0001);
203
204 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
205 }
206 EXPORT_SYMBOL(hci_le_conn_update);
207
208 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __u8 rand[8],
209 __u8 ltk[16])
210 {
211 struct hci_dev *hdev = conn->hdev;
212 struct hci_cp_le_start_enc cp;
213
214 BT_DBG("%p", conn);
215
216 memset(&cp, 0, sizeof(cp));
217
218 cp.handle = cpu_to_le16(conn->handle);
219 memcpy(cp.ltk, ltk, sizeof(cp.ltk));
220 cp.ediv = ediv;
221 memcpy(cp.rand, rand, sizeof(cp.rand));
222
223 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
224 }
225 EXPORT_SYMBOL(hci_le_start_enc);
226
227 void hci_le_ltk_reply(struct hci_conn *conn, u8 ltk[16])
228 {
229 struct hci_dev *hdev = conn->hdev;
230 struct hci_cp_le_ltk_reply cp;
231
232 BT_DBG("%p", conn);
233
234 memset(&cp, 0, sizeof(cp));
235
236 cp.handle = cpu_to_le16(conn->handle);
237 memcpy(cp.ltk, ltk, sizeof(ltk));
238
239 hci_send_cmd(hdev, HCI_OP_LE_LTK_REPLY, sizeof(cp), &cp);
240 }
241 EXPORT_SYMBOL(hci_le_ltk_reply);
242
243 void hci_le_ltk_neg_reply(struct hci_conn *conn)
244 {
245 struct hci_dev *hdev = conn->hdev;
246 struct hci_cp_le_ltk_neg_reply cp;
247
248 BT_DBG("%p", conn);
249
250 memset(&cp, 0, sizeof(cp));
251
252 cp.handle = cpu_to_le16(conn->handle);
253
254 hci_send_cmd(hdev, HCI_OP_LE_LTK_NEG_REPLY, sizeof(cp), &cp);
255 }
256
257 /* Device _must_ be locked */
258 void hci_sco_setup(struct hci_conn *conn, __u8 status)
259 {
260 struct hci_conn *sco = conn->link;
261
262 BT_DBG("%p", conn);
263
264 if (!sco)
265 return;
266
267 if (!status) {
268 if (lmp_esco_capable(conn->hdev))
269 hci_setup_sync(sco, conn->handle);
270 else
271 hci_add_sco(sco, conn->handle);
272 } else {
273 hci_proto_connect_cfm(sco, status);
274 hci_conn_del(sco);
275 }
276 }
277
278 static void hci_conn_timeout(unsigned long arg)
279 {
280 struct hci_conn *conn = (void *) arg;
281 struct hci_dev *hdev = conn->hdev;
282 __u8 reason;
283
284 BT_DBG("conn %p state %d", conn, conn->state);
285
286 if (atomic_read(&conn->refcnt))
287 return;
288
289 hci_dev_lock(hdev);
290
291 switch (conn->state) {
292 case BT_CONNECT:
293 case BT_CONNECT2:
294 if (conn->out) {
295 if (conn->type == ACL_LINK)
296 hci_acl_connect_cancel(conn);
297 else if (conn->type == LE_LINK)
298 hci_le_connect_cancel(conn);
299 }
300 break;
301 case BT_CONFIG:
302 case BT_CONNECTED:
303 reason = hci_proto_disconn_ind(conn);
304 hci_acl_disconn(conn, reason);
305 break;
306 default:
307 conn->state = BT_CLOSED;
308 break;
309 }
310
311 hci_dev_unlock(hdev);
312 }
313
314 static void hci_conn_idle(unsigned long arg)
315 {
316 struct hci_conn *conn = (void *) arg;
317
318 BT_DBG("conn %p mode %d", conn, conn->mode);
319
320 hci_conn_enter_sniff_mode(conn);
321 }
322
323 static void hci_conn_auto_accept(unsigned long arg)
324 {
325 struct hci_conn *conn = (void *) arg;
326 struct hci_dev *hdev = conn->hdev;
327
328 hci_dev_lock(hdev);
329
330 hci_send_cmd(hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
331 &conn->dst);
332
333 hci_dev_unlock(hdev);
334 }
335
336 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
337 {
338 struct hci_conn *conn;
339
340 BT_DBG("%s dst %s", hdev->name, batostr(dst));
341
342 conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
343 if (!conn)
344 return NULL;
345
346 bacpy(&conn->dst, dst);
347 conn->hdev = hdev;
348 conn->type = type;
349 conn->mode = HCI_CM_ACTIVE;
350 conn->state = BT_OPEN;
351 conn->auth_type = HCI_AT_GENERAL_BONDING;
352 conn->io_capability = hdev->io_capability;
353 conn->remote_auth = 0xff;
354 conn->key_type = 0xff;
355
356 conn->power_save = 1;
357 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
358
359 switch (type) {
360 case ACL_LINK:
361 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
362 break;
363 case SCO_LINK:
364 if (lmp_esco_capable(hdev))
365 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
366 (hdev->esco_type & EDR_ESCO_MASK);
367 else
368 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
369 break;
370 case ESCO_LINK:
371 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
372 break;
373 }
374
375 skb_queue_head_init(&conn->data_q);
376
377 setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
378 setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
379 setup_timer(&conn->auto_accept_timer, hci_conn_auto_accept,
380 (unsigned long) conn);
381
382 atomic_set(&conn->refcnt, 0);
383
384 hci_dev_hold(hdev);
385
386 tasklet_disable(&hdev->tx_task);
387
388 hci_conn_hash_add(hdev, conn);
389 if (hdev->notify)
390 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
391
392 atomic_set(&conn->devref, 0);
393
394 hci_conn_init_sysfs(conn);
395
396 tasklet_enable(&hdev->tx_task);
397
398 return conn;
399 }
400
401 int hci_conn_del(struct hci_conn *conn)
402 {
403 struct hci_dev *hdev = conn->hdev;
404
405 BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
406
407 del_timer(&conn->idle_timer);
408
409 del_timer(&conn->disc_timer);
410
411 del_timer(&conn->auto_accept_timer);
412
413 if (conn->type == ACL_LINK) {
414 struct hci_conn *sco = conn->link;
415 if (sco)
416 sco->link = NULL;
417
418 /* Unacked frames */
419 hdev->acl_cnt += conn->sent;
420 } else if (conn->type == LE_LINK) {
421 if (hdev->le_pkts)
422 hdev->le_cnt += conn->sent;
423 else
424 hdev->acl_cnt += conn->sent;
425 } else {
426 struct hci_conn *acl = conn->link;
427 if (acl) {
428 acl->link = NULL;
429 hci_conn_put(acl);
430 }
431 }
432
433 tasklet_disable(&hdev->tx_task);
434
435 hci_conn_hash_del(hdev, conn);
436 if (hdev->notify)
437 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
438
439 tasklet_enable(&hdev->tx_task);
440
441 skb_queue_purge(&conn->data_q);
442
443 hci_conn_put_device(conn);
444
445 hci_dev_put(hdev);
446
447 if (conn->handle == 0)
448 kfree(conn);
449
450 return 0;
451 }
452
453 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
454 {
455 int use_src = bacmp(src, BDADDR_ANY);
456 struct hci_dev *hdev = NULL;
457 struct list_head *p;
458
459 BT_DBG("%s -> %s", batostr(src), batostr(dst));
460
461 read_lock_bh(&hci_dev_list_lock);
462
463 list_for_each(p, &hci_dev_list) {
464 struct hci_dev *d = list_entry(p, struct hci_dev, list);
465
466 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
467 continue;
468
469 /* Simple routing:
470 * No source address - find interface with bdaddr != dst
471 * Source address - find interface with bdaddr == src
472 */
473
474 if (use_src) {
475 if (!bacmp(&d->bdaddr, src)) {
476 hdev = d; break;
477 }
478 } else {
479 if (bacmp(&d->bdaddr, dst)) {
480 hdev = d; break;
481 }
482 }
483 }
484
485 if (hdev)
486 hdev = hci_dev_hold(hdev);
487
488 read_unlock_bh(&hci_dev_list_lock);
489 return hdev;
490 }
491 EXPORT_SYMBOL(hci_get_route);
492
493 /* Create SCO, ACL or LE connection.
494 * Device _must_ be locked */
495 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
496 {
497 struct hci_conn *acl;
498 struct hci_conn *sco;
499 struct hci_conn *le;
500
501 BT_DBG("%s dst %s", hdev->name, batostr(dst));
502
503 if (type == LE_LINK) {
504 struct adv_entry *entry;
505
506 le = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
507 if (le)
508 return ERR_PTR(-EBUSY);
509
510 entry = hci_find_adv_entry(hdev, dst);
511 if (!entry)
512 return ERR_PTR(-EHOSTUNREACH);
513
514 le = hci_conn_add(hdev, LE_LINK, dst);
515 if (!le)
516 return ERR_PTR(-ENOMEM);
517
518 le->dst_type = entry->bdaddr_type;
519
520 hci_le_connect(le);
521
522 hci_conn_hold(le);
523
524 return le;
525 }
526
527 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
528 if (!acl) {
529 acl = hci_conn_add(hdev, ACL_LINK, dst);
530 if (!acl)
531 return NULL;
532 }
533
534 hci_conn_hold(acl);
535
536 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
537 acl->sec_level = BT_SECURITY_LOW;
538 acl->pending_sec_level = sec_level;
539 acl->auth_type = auth_type;
540 hci_acl_connect(acl);
541 }
542
543 if (type == ACL_LINK)
544 return acl;
545
546 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
547 if (!sco) {
548 sco = hci_conn_add(hdev, type, dst);
549 if (!sco) {
550 hci_conn_put(acl);
551 return NULL;
552 }
553 }
554
555 acl->link = sco;
556 sco->link = acl;
557
558 hci_conn_hold(sco);
559
560 if (acl->state == BT_CONNECTED &&
561 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
562 acl->power_save = 1;
563 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
564
565 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->pend)) {
566 /* defer SCO setup until mode change completed */
567 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->pend);
568 return sco;
569 }
570
571 hci_sco_setup(acl, 0x00);
572 }
573
574 return sco;
575 }
576 EXPORT_SYMBOL(hci_connect);
577
578 /* Check link security requirement */
579 int hci_conn_check_link_mode(struct hci_conn *conn)
580 {
581 BT_DBG("conn %p", conn);
582
583 if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
584 !(conn->link_mode & HCI_LM_ENCRYPT))
585 return 0;
586
587 return 1;
588 }
589 EXPORT_SYMBOL(hci_conn_check_link_mode);
590
591 /* Authenticate remote device */
592 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
593 {
594 BT_DBG("conn %p", conn);
595
596 if (conn->pending_sec_level > sec_level)
597 sec_level = conn->pending_sec_level;
598
599 if (sec_level > conn->sec_level)
600 conn->pending_sec_level = sec_level;
601 else if (conn->link_mode & HCI_LM_AUTH)
602 return 1;
603
604 /* Make sure we preserve an existing MITM requirement*/
605 auth_type |= (conn->auth_type & 0x01);
606
607 conn->auth_type = auth_type;
608
609 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
610 struct hci_cp_auth_requested cp;
611 cp.handle = cpu_to_le16(conn->handle);
612 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
613 sizeof(cp), &cp);
614 if (conn->key_type != 0xff)
615 set_bit(HCI_CONN_REAUTH_PEND, &conn->pend);
616 }
617
618 return 0;
619 }
620
621 /* Encrypt the the link */
622 static void hci_conn_encrypt(struct hci_conn *conn)
623 {
624 BT_DBG("conn %p", conn);
625
626 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend)) {
627 struct hci_cp_set_conn_encrypt cp;
628 cp.handle = cpu_to_le16(conn->handle);
629 cp.encrypt = 0x01;
630 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
631 &cp);
632 }
633 }
634
635 /* Enable security */
636 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
637 {
638 BT_DBG("conn %p", conn);
639
640 /* For sdp we don't need the link key. */
641 if (sec_level == BT_SECURITY_SDP)
642 return 1;
643
644 /* For non 2.1 devices and low security level we don't need the link
645 key. */
646 if (sec_level == BT_SECURITY_LOW &&
647 (!conn->ssp_mode || !conn->hdev->ssp_mode))
648 return 1;
649
650 /* For other security levels we need the link key. */
651 if (!(conn->link_mode & HCI_LM_AUTH))
652 goto auth;
653
654 /* An authenticated combination key has sufficient security for any
655 security level. */
656 if (conn->key_type == HCI_LK_AUTH_COMBINATION)
657 goto encrypt;
658
659 /* An unauthenticated combination key has sufficient security for
660 security level 1 and 2. */
661 if (conn->key_type == HCI_LK_UNAUTH_COMBINATION &&
662 (sec_level == BT_SECURITY_MEDIUM ||
663 sec_level == BT_SECURITY_LOW))
664 goto encrypt;
665
666 /* A combination key has always sufficient security for the security
667 levels 1 or 2. High security level requires the combination key
668 is generated using maximum PIN code length (16).
669 For pre 2.1 units. */
670 if (conn->key_type == HCI_LK_COMBINATION &&
671 (sec_level != BT_SECURITY_HIGH ||
672 conn->pin_length == 16))
673 goto encrypt;
674
675 auth:
676 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
677 return 0;
678
679 if (!hci_conn_auth(conn, sec_level, auth_type))
680 return 0;
681
682 encrypt:
683 if (conn->link_mode & HCI_LM_ENCRYPT)
684 return 1;
685
686 hci_conn_encrypt(conn);
687 return 0;
688 }
689 EXPORT_SYMBOL(hci_conn_security);
690
691 /* Check secure link requirement */
692 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
693 {
694 BT_DBG("conn %p", conn);
695
696 if (sec_level != BT_SECURITY_HIGH)
697 return 1; /* Accept if non-secure is required */
698
699 if (conn->sec_level == BT_SECURITY_HIGH)
700 return 1;
701
702 return 0; /* Reject not secure link */
703 }
704 EXPORT_SYMBOL(hci_conn_check_secure);
705
706 /* Change link key */
707 int hci_conn_change_link_key(struct hci_conn *conn)
708 {
709 BT_DBG("conn %p", conn);
710
711 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
712 struct hci_cp_change_conn_link_key cp;
713 cp.handle = cpu_to_le16(conn->handle);
714 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
715 sizeof(cp), &cp);
716 }
717
718 return 0;
719 }
720 EXPORT_SYMBOL(hci_conn_change_link_key);
721
722 /* Switch role */
723 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
724 {
725 BT_DBG("conn %p", conn);
726
727 if (!role && conn->link_mode & HCI_LM_MASTER)
728 return 1;
729
730 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
731 struct hci_cp_switch_role cp;
732 bacpy(&cp.bdaddr, &conn->dst);
733 cp.role = role;
734 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
735 }
736
737 return 0;
738 }
739 EXPORT_SYMBOL(hci_conn_switch_role);
740
741 /* Enter active mode */
742 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
743 {
744 struct hci_dev *hdev = conn->hdev;
745
746 BT_DBG("conn %p mode %d", conn, conn->mode);
747
748 if (test_bit(HCI_RAW, &hdev->flags))
749 return;
750
751 if (conn->mode != HCI_CM_SNIFF)
752 goto timer;
753
754 if (!conn->power_save && !force_active)
755 goto timer;
756
757 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
758 struct hci_cp_exit_sniff_mode cp;
759 cp.handle = cpu_to_le16(conn->handle);
760 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
761 }
762
763 timer:
764 if (hdev->idle_timeout > 0)
765 mod_timer(&conn->idle_timer,
766 jiffies + msecs_to_jiffies(hdev->idle_timeout));
767 }
768
769 /* Enter sniff mode */
770 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
771 {
772 struct hci_dev *hdev = conn->hdev;
773
774 BT_DBG("conn %p mode %d", conn, conn->mode);
775
776 if (test_bit(HCI_RAW, &hdev->flags))
777 return;
778
779 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
780 return;
781
782 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
783 return;
784
785 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
786 struct hci_cp_sniff_subrate cp;
787 cp.handle = cpu_to_le16(conn->handle);
788 cp.max_latency = cpu_to_le16(0);
789 cp.min_remote_timeout = cpu_to_le16(0);
790 cp.min_local_timeout = cpu_to_le16(0);
791 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
792 }
793
794 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
795 struct hci_cp_sniff_mode cp;
796 cp.handle = cpu_to_le16(conn->handle);
797 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
798 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
799 cp.attempt = cpu_to_le16(4);
800 cp.timeout = cpu_to_le16(1);
801 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
802 }
803 }
804
805 /* Drop all connection on the device */
806 void hci_conn_hash_flush(struct hci_dev *hdev)
807 {
808 struct hci_conn_hash *h = &hdev->conn_hash;
809 struct list_head *p;
810
811 BT_DBG("hdev %s", hdev->name);
812
813 p = h->list.next;
814 while (p != &h->list) {
815 struct hci_conn *c;
816
817 c = list_entry(p, struct hci_conn, list);
818 p = p->next;
819
820 c->state = BT_CLOSED;
821
822 hci_proto_disconn_cfm(c, 0x16);
823 hci_conn_del(c);
824 }
825 }
826
827 /* Check pending connect attempts */
828 void hci_conn_check_pending(struct hci_dev *hdev)
829 {
830 struct hci_conn *conn;
831
832 BT_DBG("hdev %s", hdev->name);
833
834 hci_dev_lock(hdev);
835
836 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
837 if (conn)
838 hci_acl_connect(conn);
839
840 hci_dev_unlock(hdev);
841 }
842
843 void hci_conn_hold_device(struct hci_conn *conn)
844 {
845 atomic_inc(&conn->devref);
846 }
847 EXPORT_SYMBOL(hci_conn_hold_device);
848
849 void hci_conn_put_device(struct hci_conn *conn)
850 {
851 if (atomic_dec_and_test(&conn->devref))
852 hci_conn_del_sysfs(conn);
853 }
854 EXPORT_SYMBOL(hci_conn_put_device);
855
856 int hci_get_conn_list(void __user *arg)
857 {
858 struct hci_conn_list_req req, *cl;
859 struct hci_conn_info *ci;
860 struct hci_dev *hdev;
861 struct list_head *p;
862 int n = 0, size, err;
863
864 if (copy_from_user(&req, arg, sizeof(req)))
865 return -EFAULT;
866
867 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
868 return -EINVAL;
869
870 size = sizeof(req) + req.conn_num * sizeof(*ci);
871
872 cl = kmalloc(size, GFP_KERNEL);
873 if (!cl)
874 return -ENOMEM;
875
876 hdev = hci_dev_get(req.dev_id);
877 if (!hdev) {
878 kfree(cl);
879 return -ENODEV;
880 }
881
882 ci = cl->conn_info;
883
884 hci_dev_lock_bh(hdev);
885 list_for_each(p, &hdev->conn_hash.list) {
886 register struct hci_conn *c;
887 c = list_entry(p, struct hci_conn, list);
888
889 bacpy(&(ci + n)->bdaddr, &c->dst);
890 (ci + n)->handle = c->handle;
891 (ci + n)->type = c->type;
892 (ci + n)->out = c->out;
893 (ci + n)->state = c->state;
894 (ci + n)->link_mode = c->link_mode;
895 if (++n >= req.conn_num)
896 break;
897 }
898 hci_dev_unlock_bh(hdev);
899
900 cl->dev_id = hdev->id;
901 cl->conn_num = n;
902 size = sizeof(req) + n * sizeof(*ci);
903
904 hci_dev_put(hdev);
905
906 err = copy_to_user(arg, cl, size);
907 kfree(cl);
908
909 return err ? -EFAULT : 0;
910 }
911
912 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
913 {
914 struct hci_conn_info_req req;
915 struct hci_conn_info ci;
916 struct hci_conn *conn;
917 char __user *ptr = arg + sizeof(req);
918
919 if (copy_from_user(&req, arg, sizeof(req)))
920 return -EFAULT;
921
922 hci_dev_lock_bh(hdev);
923 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
924 if (conn) {
925 bacpy(&ci.bdaddr, &conn->dst);
926 ci.handle = conn->handle;
927 ci.type = conn->type;
928 ci.out = conn->out;
929 ci.state = conn->state;
930 ci.link_mode = conn->link_mode;
931 }
932 hci_dev_unlock_bh(hdev);
933
934 if (!conn)
935 return -ENOENT;
936
937 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
938 }
939
940 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
941 {
942 struct hci_auth_info_req req;
943 struct hci_conn *conn;
944
945 if (copy_from_user(&req, arg, sizeof(req)))
946 return -EFAULT;
947
948 hci_dev_lock_bh(hdev);
949 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
950 if (conn)
951 req.type = conn->auth_type;
952 hci_dev_unlock_bh(hdev);
953
954 if (!conn)
955 return -ENOENT;
956
957 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
958 }
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