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0857dd3b JH |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | ||
4 | Copyright (C) 2014 Intel Corporation | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License version 2 as | |
8 | published by the Free Software Foundation; | |
9 | ||
10 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
11 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
12 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
13 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
14 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
15 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | ||
19 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
20 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
21 | SOFTWARE IS DISCLAIMED. | |
22 | */ | |
23 | ||
24 | #include <net/bluetooth/bluetooth.h> | |
25 | #include <net/bluetooth/hci_core.h> | |
26 | ||
27 | #include "smp.h" | |
28 | #include "hci_request.h" | |
29 | ||
30 | void hci_req_init(struct hci_request *req, struct hci_dev *hdev) | |
31 | { | |
32 | skb_queue_head_init(&req->cmd_q); | |
33 | req->hdev = hdev; | |
34 | req->err = 0; | |
35 | } | |
36 | ||
e6214487 JH |
37 | static int req_run(struct hci_request *req, hci_req_complete_t complete, |
38 | hci_req_complete_skb_t complete_skb) | |
0857dd3b JH |
39 | { |
40 | struct hci_dev *hdev = req->hdev; | |
41 | struct sk_buff *skb; | |
42 | unsigned long flags; | |
43 | ||
44 | BT_DBG("length %u", skb_queue_len(&req->cmd_q)); | |
45 | ||
46 | /* If an error occurred during request building, remove all HCI | |
47 | * commands queued on the HCI request queue. | |
48 | */ | |
49 | if (req->err) { | |
50 | skb_queue_purge(&req->cmd_q); | |
51 | return req->err; | |
52 | } | |
53 | ||
54 | /* Do not allow empty requests */ | |
55 | if (skb_queue_empty(&req->cmd_q)) | |
56 | return -ENODATA; | |
57 | ||
58 | skb = skb_peek_tail(&req->cmd_q); | |
db6e3e8d | 59 | bt_cb(skb)->req.complete = complete; |
e6214487 | 60 | bt_cb(skb)->req.complete_skb = complete_skb; |
0857dd3b JH |
61 | |
62 | spin_lock_irqsave(&hdev->cmd_q.lock, flags); | |
63 | skb_queue_splice_tail(&req->cmd_q, &hdev->cmd_q); | |
64 | spin_unlock_irqrestore(&hdev->cmd_q.lock, flags); | |
65 | ||
66 | queue_work(hdev->workqueue, &hdev->cmd_work); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
e6214487 JH |
71 | int hci_req_run(struct hci_request *req, hci_req_complete_t complete) |
72 | { | |
73 | return req_run(req, complete, NULL); | |
74 | } | |
75 | ||
76 | int hci_req_run_skb(struct hci_request *req, hci_req_complete_skb_t complete) | |
77 | { | |
78 | return req_run(req, NULL, complete); | |
79 | } | |
80 | ||
0857dd3b JH |
81 | struct sk_buff *hci_prepare_cmd(struct hci_dev *hdev, u16 opcode, u32 plen, |
82 | const void *param) | |
83 | { | |
84 | int len = HCI_COMMAND_HDR_SIZE + plen; | |
85 | struct hci_command_hdr *hdr; | |
86 | struct sk_buff *skb; | |
87 | ||
88 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
89 | if (!skb) | |
90 | return NULL; | |
91 | ||
92 | hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE); | |
93 | hdr->opcode = cpu_to_le16(opcode); | |
94 | hdr->plen = plen; | |
95 | ||
96 | if (plen) | |
97 | memcpy(skb_put(skb, plen), param, plen); | |
98 | ||
99 | BT_DBG("skb len %d", skb->len); | |
100 | ||
101 | bt_cb(skb)->pkt_type = HCI_COMMAND_PKT; | |
102 | bt_cb(skb)->opcode = opcode; | |
103 | ||
104 | return skb; | |
105 | } | |
106 | ||
107 | /* Queue a command to an asynchronous HCI request */ | |
108 | void hci_req_add_ev(struct hci_request *req, u16 opcode, u32 plen, | |
109 | const void *param, u8 event) | |
110 | { | |
111 | struct hci_dev *hdev = req->hdev; | |
112 | struct sk_buff *skb; | |
113 | ||
114 | BT_DBG("%s opcode 0x%4.4x plen %d", hdev->name, opcode, plen); | |
115 | ||
116 | /* If an error occurred during request building, there is no point in | |
117 | * queueing the HCI command. We can simply return. | |
118 | */ | |
119 | if (req->err) | |
120 | return; | |
121 | ||
122 | skb = hci_prepare_cmd(hdev, opcode, plen, param); | |
123 | if (!skb) { | |
124 | BT_ERR("%s no memory for command (opcode 0x%4.4x)", | |
125 | hdev->name, opcode); | |
126 | req->err = -ENOMEM; | |
127 | return; | |
128 | } | |
129 | ||
130 | if (skb_queue_empty(&req->cmd_q)) | |
db6e3e8d | 131 | bt_cb(skb)->req.start = true; |
0857dd3b | 132 | |
db6e3e8d | 133 | bt_cb(skb)->req.event = event; |
0857dd3b JH |
134 | |
135 | skb_queue_tail(&req->cmd_q, skb); | |
136 | } | |
137 | ||
138 | void hci_req_add(struct hci_request *req, u16 opcode, u32 plen, | |
139 | const void *param) | |
140 | { | |
141 | hci_req_add_ev(req, opcode, plen, param, 0); | |
142 | } | |
143 | ||
144 | void hci_req_add_le_scan_disable(struct hci_request *req) | |
145 | { | |
146 | struct hci_cp_le_set_scan_enable cp; | |
147 | ||
148 | memset(&cp, 0, sizeof(cp)); | |
149 | cp.enable = LE_SCAN_DISABLE; | |
150 | hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp); | |
151 | } | |
152 | ||
153 | static void add_to_white_list(struct hci_request *req, | |
154 | struct hci_conn_params *params) | |
155 | { | |
156 | struct hci_cp_le_add_to_white_list cp; | |
157 | ||
158 | cp.bdaddr_type = params->addr_type; | |
159 | bacpy(&cp.bdaddr, ¶ms->addr); | |
160 | ||
161 | hci_req_add(req, HCI_OP_LE_ADD_TO_WHITE_LIST, sizeof(cp), &cp); | |
162 | } | |
163 | ||
164 | static u8 update_white_list(struct hci_request *req) | |
165 | { | |
166 | struct hci_dev *hdev = req->hdev; | |
167 | struct hci_conn_params *params; | |
168 | struct bdaddr_list *b; | |
169 | uint8_t white_list_entries = 0; | |
170 | ||
171 | /* Go through the current white list programmed into the | |
172 | * controller one by one and check if that address is still | |
173 | * in the list of pending connections or list of devices to | |
174 | * report. If not present in either list, then queue the | |
175 | * command to remove it from the controller. | |
176 | */ | |
177 | list_for_each_entry(b, &hdev->le_white_list, list) { | |
178 | struct hci_cp_le_del_from_white_list cp; | |
179 | ||
180 | if (hci_pend_le_action_lookup(&hdev->pend_le_conns, | |
181 | &b->bdaddr, b->bdaddr_type) || | |
182 | hci_pend_le_action_lookup(&hdev->pend_le_reports, | |
183 | &b->bdaddr, b->bdaddr_type)) { | |
184 | white_list_entries++; | |
185 | continue; | |
186 | } | |
187 | ||
188 | cp.bdaddr_type = b->bdaddr_type; | |
189 | bacpy(&cp.bdaddr, &b->bdaddr); | |
190 | ||
191 | hci_req_add(req, HCI_OP_LE_DEL_FROM_WHITE_LIST, | |
192 | sizeof(cp), &cp); | |
193 | } | |
194 | ||
195 | /* Since all no longer valid white list entries have been | |
196 | * removed, walk through the list of pending connections | |
197 | * and ensure that any new device gets programmed into | |
198 | * the controller. | |
199 | * | |
200 | * If the list of the devices is larger than the list of | |
201 | * available white list entries in the controller, then | |
202 | * just abort and return filer policy value to not use the | |
203 | * white list. | |
204 | */ | |
205 | list_for_each_entry(params, &hdev->pend_le_conns, action) { | |
206 | if (hci_bdaddr_list_lookup(&hdev->le_white_list, | |
207 | ¶ms->addr, params->addr_type)) | |
208 | continue; | |
209 | ||
210 | if (white_list_entries >= hdev->le_white_list_size) { | |
211 | /* Select filter policy to accept all advertising */ | |
212 | return 0x00; | |
213 | } | |
214 | ||
215 | if (hci_find_irk_by_addr(hdev, ¶ms->addr, | |
216 | params->addr_type)) { | |
217 | /* White list can not be used with RPAs */ | |
218 | return 0x00; | |
219 | } | |
220 | ||
221 | white_list_entries++; | |
222 | add_to_white_list(req, params); | |
223 | } | |
224 | ||
225 | /* After adding all new pending connections, walk through | |
226 | * the list of pending reports and also add these to the | |
227 | * white list if there is still space. | |
228 | */ | |
229 | list_for_each_entry(params, &hdev->pend_le_reports, action) { | |
230 | if (hci_bdaddr_list_lookup(&hdev->le_white_list, | |
231 | ¶ms->addr, params->addr_type)) | |
232 | continue; | |
233 | ||
234 | if (white_list_entries >= hdev->le_white_list_size) { | |
235 | /* Select filter policy to accept all advertising */ | |
236 | return 0x00; | |
237 | } | |
238 | ||
239 | if (hci_find_irk_by_addr(hdev, ¶ms->addr, | |
240 | params->addr_type)) { | |
241 | /* White list can not be used with RPAs */ | |
242 | return 0x00; | |
243 | } | |
244 | ||
245 | white_list_entries++; | |
246 | add_to_white_list(req, params); | |
247 | } | |
248 | ||
249 | /* Select filter policy to use white list */ | |
250 | return 0x01; | |
251 | } | |
252 | ||
253 | void hci_req_add_le_passive_scan(struct hci_request *req) | |
254 | { | |
255 | struct hci_cp_le_set_scan_param param_cp; | |
256 | struct hci_cp_le_set_scan_enable enable_cp; | |
257 | struct hci_dev *hdev = req->hdev; | |
258 | u8 own_addr_type; | |
259 | u8 filter_policy; | |
260 | ||
261 | /* Set require_privacy to false since no SCAN_REQ are send | |
262 | * during passive scanning. Not using an non-resolvable address | |
263 | * here is important so that peer devices using direct | |
264 | * advertising with our address will be correctly reported | |
265 | * by the controller. | |
266 | */ | |
267 | if (hci_update_random_address(req, false, &own_addr_type)) | |
268 | return; | |
269 | ||
270 | /* Adding or removing entries from the white list must | |
271 | * happen before enabling scanning. The controller does | |
272 | * not allow white list modification while scanning. | |
273 | */ | |
274 | filter_policy = update_white_list(req); | |
275 | ||
276 | /* When the controller is using random resolvable addresses and | |
277 | * with that having LE privacy enabled, then controllers with | |
278 | * Extended Scanner Filter Policies support can now enable support | |
279 | * for handling directed advertising. | |
280 | * | |
281 | * So instead of using filter polices 0x00 (no whitelist) | |
282 | * and 0x01 (whitelist enabled) use the new filter policies | |
283 | * 0x02 (no whitelist) and 0x03 (whitelist enabled). | |
284 | */ | |
d7a5a11d | 285 | if (hci_dev_test_flag(hdev, HCI_PRIVACY) && |
0857dd3b JH |
286 | (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY)) |
287 | filter_policy |= 0x02; | |
288 | ||
289 | memset(¶m_cp, 0, sizeof(param_cp)); | |
290 | param_cp.type = LE_SCAN_PASSIVE; | |
291 | param_cp.interval = cpu_to_le16(hdev->le_scan_interval); | |
292 | param_cp.window = cpu_to_le16(hdev->le_scan_window); | |
293 | param_cp.own_address_type = own_addr_type; | |
294 | param_cp.filter_policy = filter_policy; | |
295 | hci_req_add(req, HCI_OP_LE_SET_SCAN_PARAM, sizeof(param_cp), | |
296 | ¶m_cp); | |
297 | ||
298 | memset(&enable_cp, 0, sizeof(enable_cp)); | |
299 | enable_cp.enable = LE_SCAN_ENABLE; | |
300 | enable_cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE; | |
301 | hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp), | |
302 | &enable_cp); | |
303 | } | |
304 | ||
305 | static void set_random_addr(struct hci_request *req, bdaddr_t *rpa) | |
306 | { | |
307 | struct hci_dev *hdev = req->hdev; | |
308 | ||
309 | /* If we're advertising or initiating an LE connection we can't | |
310 | * go ahead and change the random address at this time. This is | |
311 | * because the eventual initiator address used for the | |
312 | * subsequently created connection will be undefined (some | |
313 | * controllers use the new address and others the one we had | |
314 | * when the operation started). | |
315 | * | |
316 | * In this kind of scenario skip the update and let the random | |
317 | * address be updated at the next cycle. | |
318 | */ | |
d7a5a11d | 319 | if (hci_dev_test_flag(hdev, HCI_LE_ADV) || |
0857dd3b JH |
320 | hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT)) { |
321 | BT_DBG("Deferring random address update"); | |
a1536da2 | 322 | hci_dev_set_flag(hdev, HCI_RPA_EXPIRED); |
0857dd3b JH |
323 | return; |
324 | } | |
325 | ||
326 | hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, rpa); | |
327 | } | |
328 | ||
329 | int hci_update_random_address(struct hci_request *req, bool require_privacy, | |
330 | u8 *own_addr_type) | |
331 | { | |
332 | struct hci_dev *hdev = req->hdev; | |
333 | int err; | |
334 | ||
335 | /* If privacy is enabled use a resolvable private address. If | |
336 | * current RPA has expired or there is something else than | |
337 | * the current RPA in use, then generate a new one. | |
338 | */ | |
d7a5a11d | 339 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) { |
0857dd3b JH |
340 | int to; |
341 | ||
342 | *own_addr_type = ADDR_LE_DEV_RANDOM; | |
343 | ||
a69d8927 | 344 | if (!hci_dev_test_and_clear_flag(hdev, HCI_RPA_EXPIRED) && |
0857dd3b JH |
345 | !bacmp(&hdev->random_addr, &hdev->rpa)) |
346 | return 0; | |
347 | ||
348 | err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa); | |
349 | if (err < 0) { | |
350 | BT_ERR("%s failed to generate new RPA", hdev->name); | |
351 | return err; | |
352 | } | |
353 | ||
354 | set_random_addr(req, &hdev->rpa); | |
355 | ||
356 | to = msecs_to_jiffies(hdev->rpa_timeout * 1000); | |
357 | queue_delayed_work(hdev->workqueue, &hdev->rpa_expired, to); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | /* In case of required privacy without resolvable private address, | |
363 | * use an non-resolvable private address. This is useful for active | |
364 | * scanning and non-connectable advertising. | |
365 | */ | |
366 | if (require_privacy) { | |
367 | bdaddr_t nrpa; | |
368 | ||
369 | while (true) { | |
370 | /* The non-resolvable private address is generated | |
371 | * from random six bytes with the two most significant | |
372 | * bits cleared. | |
373 | */ | |
374 | get_random_bytes(&nrpa, 6); | |
375 | nrpa.b[5] &= 0x3f; | |
376 | ||
377 | /* The non-resolvable private address shall not be | |
378 | * equal to the public address. | |
379 | */ | |
380 | if (bacmp(&hdev->bdaddr, &nrpa)) | |
381 | break; | |
382 | } | |
383 | ||
384 | *own_addr_type = ADDR_LE_DEV_RANDOM; | |
385 | set_random_addr(req, &nrpa); | |
386 | return 0; | |
387 | } | |
388 | ||
389 | /* If forcing static address is in use or there is no public | |
390 | * address use the static address as random address (but skip | |
391 | * the HCI command if the current random address is already the | |
392 | * static one. | |
50b5b952 MH |
393 | * |
394 | * In case BR/EDR has been disabled on a dual-mode controller | |
395 | * and a static address has been configured, then use that | |
396 | * address instead of the public BR/EDR address. | |
0857dd3b | 397 | */ |
b7cb93e5 | 398 | if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) || |
50b5b952 | 399 | !bacmp(&hdev->bdaddr, BDADDR_ANY) || |
d7a5a11d | 400 | (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) && |
50b5b952 | 401 | bacmp(&hdev->static_addr, BDADDR_ANY))) { |
0857dd3b JH |
402 | *own_addr_type = ADDR_LE_DEV_RANDOM; |
403 | if (bacmp(&hdev->static_addr, &hdev->random_addr)) | |
404 | hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, | |
405 | &hdev->static_addr); | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* Neither privacy nor static address is being used so use a | |
410 | * public address. | |
411 | */ | |
412 | *own_addr_type = ADDR_LE_DEV_PUBLIC; | |
413 | ||
414 | return 0; | |
415 | } | |
2cf22218 | 416 | |
405a2611 JH |
417 | static bool disconnected_whitelist_entries(struct hci_dev *hdev) |
418 | { | |
419 | struct bdaddr_list *b; | |
420 | ||
421 | list_for_each_entry(b, &hdev->whitelist, list) { | |
422 | struct hci_conn *conn; | |
423 | ||
424 | conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &b->bdaddr); | |
425 | if (!conn) | |
426 | return true; | |
427 | ||
428 | if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG) | |
429 | return true; | |
430 | } | |
431 | ||
432 | return false; | |
433 | } | |
434 | ||
435 | void __hci_update_page_scan(struct hci_request *req) | |
436 | { | |
437 | struct hci_dev *hdev = req->hdev; | |
438 | u8 scan; | |
439 | ||
d7a5a11d | 440 | if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) |
405a2611 JH |
441 | return; |
442 | ||
443 | if (!hdev_is_powered(hdev)) | |
444 | return; | |
445 | ||
446 | if (mgmt_powering_down(hdev)) | |
447 | return; | |
448 | ||
d7a5a11d | 449 | if (hci_dev_test_flag(hdev, HCI_CONNECTABLE) || |
405a2611 JH |
450 | disconnected_whitelist_entries(hdev)) |
451 | scan = SCAN_PAGE; | |
452 | else | |
453 | scan = SCAN_DISABLED; | |
454 | ||
455 | if (test_bit(HCI_PSCAN, &hdev->flags) == !!(scan & SCAN_PAGE)) | |
456 | return; | |
457 | ||
d7a5a11d | 458 | if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE)) |
405a2611 JH |
459 | scan |= SCAN_INQUIRY; |
460 | ||
461 | hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan); | |
462 | } | |
463 | ||
464 | void hci_update_page_scan(struct hci_dev *hdev) | |
465 | { | |
466 | struct hci_request req; | |
467 | ||
468 | hci_req_init(&req, hdev); | |
469 | __hci_update_page_scan(&req); | |
470 | hci_req_run(&req, NULL); | |
471 | } | |
472 | ||
2cf22218 JH |
473 | /* This function controls the background scanning based on hdev->pend_le_conns |
474 | * list. If there are pending LE connection we start the background scanning, | |
475 | * otherwise we stop it. | |
476 | * | |
477 | * This function requires the caller holds hdev->lock. | |
478 | */ | |
479 | void __hci_update_background_scan(struct hci_request *req) | |
480 | { | |
481 | struct hci_dev *hdev = req->hdev; | |
482 | struct hci_conn *conn; | |
483 | ||
484 | if (!test_bit(HCI_UP, &hdev->flags) || | |
485 | test_bit(HCI_INIT, &hdev->flags) || | |
d7a5a11d MH |
486 | hci_dev_test_flag(hdev, HCI_SETUP) || |
487 | hci_dev_test_flag(hdev, HCI_CONFIG) || | |
488 | hci_dev_test_flag(hdev, HCI_AUTO_OFF) || | |
489 | hci_dev_test_flag(hdev, HCI_UNREGISTER)) | |
2cf22218 JH |
490 | return; |
491 | ||
492 | /* No point in doing scanning if LE support hasn't been enabled */ | |
d7a5a11d | 493 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
2cf22218 JH |
494 | return; |
495 | ||
496 | /* If discovery is active don't interfere with it */ | |
497 | if (hdev->discovery.state != DISCOVERY_STOPPED) | |
498 | return; | |
499 | ||
500 | /* Reset RSSI and UUID filters when starting background scanning | |
501 | * since these filters are meant for service discovery only. | |
502 | * | |
503 | * The Start Discovery and Start Service Discovery operations | |
504 | * ensure to set proper values for RSSI threshold and UUID | |
505 | * filter list. So it is safe to just reset them here. | |
506 | */ | |
507 | hci_discovery_filter_clear(hdev); | |
508 | ||
509 | if (list_empty(&hdev->pend_le_conns) && | |
510 | list_empty(&hdev->pend_le_reports)) { | |
511 | /* If there is no pending LE connections or devices | |
512 | * to be scanned for, we should stop the background | |
513 | * scanning. | |
514 | */ | |
515 | ||
516 | /* If controller is not scanning we are done. */ | |
d7a5a11d | 517 | if (!hci_dev_test_flag(hdev, HCI_LE_SCAN)) |
2cf22218 JH |
518 | return; |
519 | ||
520 | hci_req_add_le_scan_disable(req); | |
521 | ||
522 | BT_DBG("%s stopping background scanning", hdev->name); | |
523 | } else { | |
524 | /* If there is at least one pending LE connection, we should | |
525 | * keep the background scan running. | |
526 | */ | |
527 | ||
528 | /* If controller is connecting, we should not start scanning | |
529 | * since some controllers are not able to scan and connect at | |
530 | * the same time. | |
531 | */ | |
532 | conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT); | |
533 | if (conn) | |
534 | return; | |
535 | ||
536 | /* If controller is currently scanning, we stop it to ensure we | |
537 | * don't miss any advertising (due to duplicates filter). | |
538 | */ | |
d7a5a11d | 539 | if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) |
2cf22218 JH |
540 | hci_req_add_le_scan_disable(req); |
541 | ||
542 | hci_req_add_le_passive_scan(req); | |
543 | ||
544 | BT_DBG("%s starting background scanning", hdev->name); | |
545 | } | |
546 | } | |
547 | ||
1904a853 MH |
548 | static void update_background_scan_complete(struct hci_dev *hdev, u8 status, |
549 | u16 opcode) | |
2cf22218 JH |
550 | { |
551 | if (status) | |
552 | BT_DBG("HCI request failed to update background scanning: " | |
553 | "status 0x%2.2x", status); | |
554 | } | |
555 | ||
556 | void hci_update_background_scan(struct hci_dev *hdev) | |
557 | { | |
558 | int err; | |
559 | struct hci_request req; | |
560 | ||
561 | hci_req_init(&req, hdev); | |
562 | ||
563 | __hci_update_background_scan(&req); | |
564 | ||
565 | err = hci_req_run(&req, update_background_scan_complete); | |
566 | if (err && err != -ENODATA) | |
567 | BT_ERR("Failed to run HCI request: err %d", err); | |
568 | } |