Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 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 | |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 30 | #define HCI_REQ_DONE 0 |
| 31 | #define HCI_REQ_PEND 1 |
| 32 | #define HCI_REQ_CANCELED 2 |
| 33 | |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 34 | void hci_req_init(struct hci_request *req, struct hci_dev *hdev) |
| 35 | { |
| 36 | skb_queue_head_init(&req->cmd_q); |
| 37 | req->hdev = hdev; |
| 38 | req->err = 0; |
| 39 | } |
| 40 | |
Johan Hedberg | e6214487 | 2015-04-02 13:41:08 +0300 | [diff] [blame] | 41 | static int req_run(struct hci_request *req, hci_req_complete_t complete, |
| 42 | hci_req_complete_skb_t complete_skb) |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 43 | { |
| 44 | struct hci_dev *hdev = req->hdev; |
| 45 | struct sk_buff *skb; |
| 46 | unsigned long flags; |
| 47 | |
| 48 | BT_DBG("length %u", skb_queue_len(&req->cmd_q)); |
| 49 | |
| 50 | /* If an error occurred during request building, remove all HCI |
| 51 | * commands queued on the HCI request queue. |
| 52 | */ |
| 53 | if (req->err) { |
| 54 | skb_queue_purge(&req->cmd_q); |
| 55 | return req->err; |
| 56 | } |
| 57 | |
| 58 | /* Do not allow empty requests */ |
| 59 | if (skb_queue_empty(&req->cmd_q)) |
| 60 | return -ENODATA; |
| 61 | |
| 62 | skb = skb_peek_tail(&req->cmd_q); |
Johan Hedberg | 44d2713 | 2015-11-05 09:31:40 +0200 | [diff] [blame] | 63 | if (complete) { |
| 64 | bt_cb(skb)->hci.req_complete = complete; |
| 65 | } else if (complete_skb) { |
| 66 | bt_cb(skb)->hci.req_complete_skb = complete_skb; |
| 67 | bt_cb(skb)->hci.req_flags |= HCI_REQ_SKB; |
| 68 | } |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 69 | |
| 70 | spin_lock_irqsave(&hdev->cmd_q.lock, flags); |
| 71 | skb_queue_splice_tail(&req->cmd_q, &hdev->cmd_q); |
| 72 | spin_unlock_irqrestore(&hdev->cmd_q.lock, flags); |
| 73 | |
| 74 | queue_work(hdev->workqueue, &hdev->cmd_work); |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
Johan Hedberg | e6214487 | 2015-04-02 13:41:08 +0300 | [diff] [blame] | 79 | int hci_req_run(struct hci_request *req, hci_req_complete_t complete) |
| 80 | { |
| 81 | return req_run(req, complete, NULL); |
| 82 | } |
| 83 | |
| 84 | int hci_req_run_skb(struct hci_request *req, hci_req_complete_skb_t complete) |
| 85 | { |
| 86 | return req_run(req, NULL, complete); |
| 87 | } |
| 88 | |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 89 | static void hci_req_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode, |
| 90 | struct sk_buff *skb) |
| 91 | { |
| 92 | BT_DBG("%s result 0x%2.2x", hdev->name, result); |
| 93 | |
| 94 | if (hdev->req_status == HCI_REQ_PEND) { |
| 95 | hdev->req_result = result; |
| 96 | hdev->req_status = HCI_REQ_DONE; |
| 97 | if (skb) |
| 98 | hdev->req_skb = skb_get(skb); |
| 99 | wake_up_interruptible(&hdev->req_wait_q); |
| 100 | } |
| 101 | } |
| 102 | |
Johan Hedberg | b504430 | 2015-11-10 09:44:55 +0200 | [diff] [blame] | 103 | void hci_req_sync_cancel(struct hci_dev *hdev, int err) |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 104 | { |
| 105 | BT_DBG("%s err 0x%2.2x", hdev->name, err); |
| 106 | |
| 107 | if (hdev->req_status == HCI_REQ_PEND) { |
| 108 | hdev->req_result = err; |
| 109 | hdev->req_status = HCI_REQ_CANCELED; |
| 110 | wake_up_interruptible(&hdev->req_wait_q); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | struct sk_buff *__hci_cmd_sync_ev(struct hci_dev *hdev, u16 opcode, u32 plen, |
| 115 | const void *param, u8 event, u32 timeout) |
| 116 | { |
| 117 | DECLARE_WAITQUEUE(wait, current); |
| 118 | struct hci_request req; |
| 119 | struct sk_buff *skb; |
| 120 | int err = 0; |
| 121 | |
| 122 | BT_DBG("%s", hdev->name); |
| 123 | |
| 124 | hci_req_init(&req, hdev); |
| 125 | |
| 126 | hci_req_add_ev(&req, opcode, plen, param, event); |
| 127 | |
| 128 | hdev->req_status = HCI_REQ_PEND; |
| 129 | |
| 130 | add_wait_queue(&hdev->req_wait_q, &wait); |
| 131 | set_current_state(TASK_INTERRUPTIBLE); |
| 132 | |
| 133 | err = hci_req_run_skb(&req, hci_req_sync_complete); |
| 134 | if (err < 0) { |
| 135 | remove_wait_queue(&hdev->req_wait_q, &wait); |
| 136 | set_current_state(TASK_RUNNING); |
| 137 | return ERR_PTR(err); |
| 138 | } |
| 139 | |
| 140 | schedule_timeout(timeout); |
| 141 | |
| 142 | remove_wait_queue(&hdev->req_wait_q, &wait); |
| 143 | |
| 144 | if (signal_pending(current)) |
| 145 | return ERR_PTR(-EINTR); |
| 146 | |
| 147 | switch (hdev->req_status) { |
| 148 | case HCI_REQ_DONE: |
| 149 | err = -bt_to_errno(hdev->req_result); |
| 150 | break; |
| 151 | |
| 152 | case HCI_REQ_CANCELED: |
| 153 | err = -hdev->req_result; |
| 154 | break; |
| 155 | |
| 156 | default: |
| 157 | err = -ETIMEDOUT; |
| 158 | break; |
| 159 | } |
| 160 | |
| 161 | hdev->req_status = hdev->req_result = 0; |
| 162 | skb = hdev->req_skb; |
| 163 | hdev->req_skb = NULL; |
| 164 | |
| 165 | BT_DBG("%s end: err %d", hdev->name, err); |
| 166 | |
| 167 | if (err < 0) { |
| 168 | kfree_skb(skb); |
| 169 | return ERR_PTR(err); |
| 170 | } |
| 171 | |
| 172 | if (!skb) |
| 173 | return ERR_PTR(-ENODATA); |
| 174 | |
| 175 | return skb; |
| 176 | } |
| 177 | EXPORT_SYMBOL(__hci_cmd_sync_ev); |
| 178 | |
| 179 | struct sk_buff *__hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen, |
| 180 | const void *param, u32 timeout) |
| 181 | { |
| 182 | return __hci_cmd_sync_ev(hdev, opcode, plen, param, 0, timeout); |
| 183 | } |
| 184 | EXPORT_SYMBOL(__hci_cmd_sync); |
| 185 | |
| 186 | /* Execute request and wait for completion. */ |
| 187 | int __hci_req_sync(struct hci_dev *hdev, void (*func)(struct hci_request *req, |
| 188 | unsigned long opt), |
Johan Hedberg | 4ebeee2 | 2015-11-11 08:11:19 +0200 | [diff] [blame] | 189 | unsigned long opt, u32 timeout, u8 *hci_status) |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 190 | { |
| 191 | struct hci_request req; |
| 192 | DECLARE_WAITQUEUE(wait, current); |
| 193 | int err = 0; |
| 194 | |
| 195 | BT_DBG("%s start", hdev->name); |
| 196 | |
| 197 | hci_req_init(&req, hdev); |
| 198 | |
| 199 | hdev->req_status = HCI_REQ_PEND; |
| 200 | |
| 201 | func(&req, opt); |
| 202 | |
| 203 | add_wait_queue(&hdev->req_wait_q, &wait); |
| 204 | set_current_state(TASK_INTERRUPTIBLE); |
| 205 | |
| 206 | err = hci_req_run_skb(&req, hci_req_sync_complete); |
| 207 | if (err < 0) { |
| 208 | hdev->req_status = 0; |
| 209 | |
| 210 | remove_wait_queue(&hdev->req_wait_q, &wait); |
| 211 | set_current_state(TASK_RUNNING); |
| 212 | |
| 213 | /* ENODATA means the HCI request command queue is empty. |
| 214 | * This can happen when a request with conditionals doesn't |
| 215 | * trigger any commands to be sent. This is normal behavior |
| 216 | * and should not trigger an error return. |
| 217 | */ |
| 218 | if (err == -ENODATA) |
| 219 | return 0; |
| 220 | |
| 221 | return err; |
| 222 | } |
| 223 | |
| 224 | schedule_timeout(timeout); |
| 225 | |
| 226 | remove_wait_queue(&hdev->req_wait_q, &wait); |
| 227 | |
| 228 | if (signal_pending(current)) |
| 229 | return -EINTR; |
| 230 | |
| 231 | switch (hdev->req_status) { |
| 232 | case HCI_REQ_DONE: |
| 233 | err = -bt_to_errno(hdev->req_result); |
Johan Hedberg | 4ebeee2 | 2015-11-11 08:11:19 +0200 | [diff] [blame] | 234 | if (hci_status) |
| 235 | *hci_status = hdev->req_result; |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 236 | break; |
| 237 | |
| 238 | case HCI_REQ_CANCELED: |
| 239 | err = -hdev->req_result; |
Johan Hedberg | 4ebeee2 | 2015-11-11 08:11:19 +0200 | [diff] [blame] | 240 | if (hci_status) |
| 241 | *hci_status = HCI_ERROR_UNSPECIFIED; |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 242 | break; |
| 243 | |
| 244 | default: |
| 245 | err = -ETIMEDOUT; |
Johan Hedberg | 4ebeee2 | 2015-11-11 08:11:19 +0200 | [diff] [blame] | 246 | if (hci_status) |
| 247 | *hci_status = HCI_ERROR_UNSPECIFIED; |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 248 | break; |
| 249 | } |
| 250 | |
| 251 | hdev->req_status = hdev->req_result = 0; |
| 252 | |
| 253 | BT_DBG("%s end: err %d", hdev->name, err); |
| 254 | |
| 255 | return err; |
| 256 | } |
| 257 | |
| 258 | int hci_req_sync(struct hci_dev *hdev, void (*req)(struct hci_request *req, |
| 259 | unsigned long opt), |
Johan Hedberg | 4ebeee2 | 2015-11-11 08:11:19 +0200 | [diff] [blame] | 260 | unsigned long opt, u32 timeout, u8 *hci_status) |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 261 | { |
| 262 | int ret; |
| 263 | |
| 264 | if (!test_bit(HCI_UP, &hdev->flags)) |
| 265 | return -ENETDOWN; |
| 266 | |
| 267 | /* Serialize all requests */ |
Johan Hedberg | b504430 | 2015-11-10 09:44:55 +0200 | [diff] [blame] | 268 | hci_req_sync_lock(hdev); |
Johan Hedberg | 4ebeee2 | 2015-11-11 08:11:19 +0200 | [diff] [blame] | 269 | ret = __hci_req_sync(hdev, req, opt, timeout, hci_status); |
Johan Hedberg | b504430 | 2015-11-10 09:44:55 +0200 | [diff] [blame] | 270 | hci_req_sync_unlock(hdev); |
Johan Hedberg | be91cd0 | 2015-11-10 09:44:54 +0200 | [diff] [blame] | 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 275 | struct sk_buff *hci_prepare_cmd(struct hci_dev *hdev, u16 opcode, u32 plen, |
| 276 | const void *param) |
| 277 | { |
| 278 | int len = HCI_COMMAND_HDR_SIZE + plen; |
| 279 | struct hci_command_hdr *hdr; |
| 280 | struct sk_buff *skb; |
| 281 | |
| 282 | skb = bt_skb_alloc(len, GFP_ATOMIC); |
| 283 | if (!skb) |
| 284 | return NULL; |
| 285 | |
| 286 | hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE); |
| 287 | hdr->opcode = cpu_to_le16(opcode); |
| 288 | hdr->plen = plen; |
| 289 | |
| 290 | if (plen) |
| 291 | memcpy(skb_put(skb, plen), param, plen); |
| 292 | |
| 293 | BT_DBG("skb len %d", skb->len); |
| 294 | |
Marcel Holtmann | d79f34e | 2015-11-05 07:10:00 +0100 | [diff] [blame] | 295 | hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; |
| 296 | hci_skb_opcode(skb) = opcode; |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 297 | |
| 298 | return skb; |
| 299 | } |
| 300 | |
| 301 | /* Queue a command to an asynchronous HCI request */ |
| 302 | void hci_req_add_ev(struct hci_request *req, u16 opcode, u32 plen, |
| 303 | const void *param, u8 event) |
| 304 | { |
| 305 | struct hci_dev *hdev = req->hdev; |
| 306 | struct sk_buff *skb; |
| 307 | |
| 308 | BT_DBG("%s opcode 0x%4.4x plen %d", hdev->name, opcode, plen); |
| 309 | |
| 310 | /* If an error occurred during request building, there is no point in |
| 311 | * queueing the HCI command. We can simply return. |
| 312 | */ |
| 313 | if (req->err) |
| 314 | return; |
| 315 | |
| 316 | skb = hci_prepare_cmd(hdev, opcode, plen, param); |
| 317 | if (!skb) { |
| 318 | BT_ERR("%s no memory for command (opcode 0x%4.4x)", |
| 319 | hdev->name, opcode); |
| 320 | req->err = -ENOMEM; |
| 321 | return; |
| 322 | } |
| 323 | |
| 324 | if (skb_queue_empty(&req->cmd_q)) |
Johan Hedberg | 44d2713 | 2015-11-05 09:31:40 +0200 | [diff] [blame] | 325 | bt_cb(skb)->hci.req_flags |= HCI_REQ_START; |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 326 | |
Marcel Holtmann | 242c0eb | 2015-10-25 22:45:53 +0100 | [diff] [blame] | 327 | bt_cb(skb)->hci.req_event = event; |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 328 | |
| 329 | skb_queue_tail(&req->cmd_q, skb); |
| 330 | } |
| 331 | |
| 332 | void hci_req_add(struct hci_request *req, u16 opcode, u32 plen, |
| 333 | const void *param) |
| 334 | { |
| 335 | hci_req_add_ev(req, opcode, plen, param, 0); |
| 336 | } |
| 337 | |
| 338 | void hci_req_add_le_scan_disable(struct hci_request *req) |
| 339 | { |
| 340 | struct hci_cp_le_set_scan_enable cp; |
| 341 | |
| 342 | memset(&cp, 0, sizeof(cp)); |
| 343 | cp.enable = LE_SCAN_DISABLE; |
| 344 | hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp); |
| 345 | } |
| 346 | |
| 347 | static void add_to_white_list(struct hci_request *req, |
| 348 | struct hci_conn_params *params) |
| 349 | { |
| 350 | struct hci_cp_le_add_to_white_list cp; |
| 351 | |
| 352 | cp.bdaddr_type = params->addr_type; |
| 353 | bacpy(&cp.bdaddr, ¶ms->addr); |
| 354 | |
| 355 | hci_req_add(req, HCI_OP_LE_ADD_TO_WHITE_LIST, sizeof(cp), &cp); |
| 356 | } |
| 357 | |
| 358 | static u8 update_white_list(struct hci_request *req) |
| 359 | { |
| 360 | struct hci_dev *hdev = req->hdev; |
| 361 | struct hci_conn_params *params; |
| 362 | struct bdaddr_list *b; |
| 363 | uint8_t white_list_entries = 0; |
| 364 | |
| 365 | /* Go through the current white list programmed into the |
| 366 | * controller one by one and check if that address is still |
| 367 | * in the list of pending connections or list of devices to |
| 368 | * report. If not present in either list, then queue the |
| 369 | * command to remove it from the controller. |
| 370 | */ |
| 371 | list_for_each_entry(b, &hdev->le_white_list, list) { |
| 372 | struct hci_cp_le_del_from_white_list cp; |
| 373 | |
| 374 | if (hci_pend_le_action_lookup(&hdev->pend_le_conns, |
| 375 | &b->bdaddr, b->bdaddr_type) || |
| 376 | hci_pend_le_action_lookup(&hdev->pend_le_reports, |
| 377 | &b->bdaddr, b->bdaddr_type)) { |
| 378 | white_list_entries++; |
| 379 | continue; |
| 380 | } |
| 381 | |
| 382 | cp.bdaddr_type = b->bdaddr_type; |
| 383 | bacpy(&cp.bdaddr, &b->bdaddr); |
| 384 | |
| 385 | hci_req_add(req, HCI_OP_LE_DEL_FROM_WHITE_LIST, |
| 386 | sizeof(cp), &cp); |
| 387 | } |
| 388 | |
| 389 | /* Since all no longer valid white list entries have been |
| 390 | * removed, walk through the list of pending connections |
| 391 | * and ensure that any new device gets programmed into |
| 392 | * the controller. |
| 393 | * |
| 394 | * If the list of the devices is larger than the list of |
| 395 | * available white list entries in the controller, then |
| 396 | * just abort and return filer policy value to not use the |
| 397 | * white list. |
| 398 | */ |
| 399 | list_for_each_entry(params, &hdev->pend_le_conns, action) { |
| 400 | if (hci_bdaddr_list_lookup(&hdev->le_white_list, |
| 401 | ¶ms->addr, params->addr_type)) |
| 402 | continue; |
| 403 | |
| 404 | if (white_list_entries >= hdev->le_white_list_size) { |
| 405 | /* Select filter policy to accept all advertising */ |
| 406 | return 0x00; |
| 407 | } |
| 408 | |
| 409 | if (hci_find_irk_by_addr(hdev, ¶ms->addr, |
| 410 | params->addr_type)) { |
| 411 | /* White list can not be used with RPAs */ |
| 412 | return 0x00; |
| 413 | } |
| 414 | |
| 415 | white_list_entries++; |
| 416 | add_to_white_list(req, params); |
| 417 | } |
| 418 | |
| 419 | /* After adding all new pending connections, walk through |
| 420 | * the list of pending reports and also add these to the |
| 421 | * white list if there is still space. |
| 422 | */ |
| 423 | list_for_each_entry(params, &hdev->pend_le_reports, action) { |
| 424 | if (hci_bdaddr_list_lookup(&hdev->le_white_list, |
| 425 | ¶ms->addr, params->addr_type)) |
| 426 | continue; |
| 427 | |
| 428 | if (white_list_entries >= hdev->le_white_list_size) { |
| 429 | /* Select filter policy to accept all advertising */ |
| 430 | return 0x00; |
| 431 | } |
| 432 | |
| 433 | if (hci_find_irk_by_addr(hdev, ¶ms->addr, |
| 434 | params->addr_type)) { |
| 435 | /* White list can not be used with RPAs */ |
| 436 | return 0x00; |
| 437 | } |
| 438 | |
| 439 | white_list_entries++; |
| 440 | add_to_white_list(req, params); |
| 441 | } |
| 442 | |
| 443 | /* Select filter policy to use white list */ |
| 444 | return 0x01; |
| 445 | } |
| 446 | |
| 447 | void hci_req_add_le_passive_scan(struct hci_request *req) |
| 448 | { |
| 449 | struct hci_cp_le_set_scan_param param_cp; |
| 450 | struct hci_cp_le_set_scan_enable enable_cp; |
| 451 | struct hci_dev *hdev = req->hdev; |
| 452 | u8 own_addr_type; |
| 453 | u8 filter_policy; |
| 454 | |
| 455 | /* Set require_privacy to false since no SCAN_REQ are send |
| 456 | * during passive scanning. Not using an non-resolvable address |
| 457 | * here is important so that peer devices using direct |
| 458 | * advertising with our address will be correctly reported |
| 459 | * by the controller. |
| 460 | */ |
| 461 | if (hci_update_random_address(req, false, &own_addr_type)) |
| 462 | return; |
| 463 | |
| 464 | /* Adding or removing entries from the white list must |
| 465 | * happen before enabling scanning. The controller does |
| 466 | * not allow white list modification while scanning. |
| 467 | */ |
| 468 | filter_policy = update_white_list(req); |
| 469 | |
| 470 | /* When the controller is using random resolvable addresses and |
| 471 | * with that having LE privacy enabled, then controllers with |
| 472 | * Extended Scanner Filter Policies support can now enable support |
| 473 | * for handling directed advertising. |
| 474 | * |
| 475 | * So instead of using filter polices 0x00 (no whitelist) |
| 476 | * and 0x01 (whitelist enabled) use the new filter policies |
| 477 | * 0x02 (no whitelist) and 0x03 (whitelist enabled). |
| 478 | */ |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 479 | if (hci_dev_test_flag(hdev, HCI_PRIVACY) && |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 480 | (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY)) |
| 481 | filter_policy |= 0x02; |
| 482 | |
| 483 | memset(¶m_cp, 0, sizeof(param_cp)); |
| 484 | param_cp.type = LE_SCAN_PASSIVE; |
| 485 | param_cp.interval = cpu_to_le16(hdev->le_scan_interval); |
| 486 | param_cp.window = cpu_to_le16(hdev->le_scan_window); |
| 487 | param_cp.own_address_type = own_addr_type; |
| 488 | param_cp.filter_policy = filter_policy; |
| 489 | hci_req_add(req, HCI_OP_LE_SET_SCAN_PARAM, sizeof(param_cp), |
| 490 | ¶m_cp); |
| 491 | |
| 492 | memset(&enable_cp, 0, sizeof(enable_cp)); |
| 493 | enable_cp.enable = LE_SCAN_ENABLE; |
| 494 | enable_cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE; |
| 495 | hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp), |
| 496 | &enable_cp); |
| 497 | } |
| 498 | |
| 499 | static void set_random_addr(struct hci_request *req, bdaddr_t *rpa) |
| 500 | { |
| 501 | struct hci_dev *hdev = req->hdev; |
| 502 | |
| 503 | /* If we're advertising or initiating an LE connection we can't |
| 504 | * go ahead and change the random address at this time. This is |
| 505 | * because the eventual initiator address used for the |
| 506 | * subsequently created connection will be undefined (some |
| 507 | * controllers use the new address and others the one we had |
| 508 | * when the operation started). |
| 509 | * |
| 510 | * In this kind of scenario skip the update and let the random |
| 511 | * address be updated at the next cycle. |
| 512 | */ |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 513 | if (hci_dev_test_flag(hdev, HCI_LE_ADV) || |
Jakub Pawlowski | e7d9ab7 | 2015-08-07 20:22:52 +0200 | [diff] [blame] | 514 | hci_lookup_le_connect(hdev)) { |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 515 | BT_DBG("Deferring random address update"); |
Marcel Holtmann | a1536da | 2015-03-13 02:11:01 -0700 | [diff] [blame] | 516 | hci_dev_set_flag(hdev, HCI_RPA_EXPIRED); |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 517 | return; |
| 518 | } |
| 519 | |
| 520 | hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, rpa); |
| 521 | } |
| 522 | |
| 523 | int hci_update_random_address(struct hci_request *req, bool require_privacy, |
| 524 | u8 *own_addr_type) |
| 525 | { |
| 526 | struct hci_dev *hdev = req->hdev; |
| 527 | int err; |
| 528 | |
| 529 | /* If privacy is enabled use a resolvable private address. If |
| 530 | * current RPA has expired or there is something else than |
| 531 | * the current RPA in use, then generate a new one. |
| 532 | */ |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 533 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) { |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 534 | int to; |
| 535 | |
| 536 | *own_addr_type = ADDR_LE_DEV_RANDOM; |
| 537 | |
Marcel Holtmann | a69d892 | 2015-03-13 02:11:05 -0700 | [diff] [blame] | 538 | if (!hci_dev_test_and_clear_flag(hdev, HCI_RPA_EXPIRED) && |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 539 | !bacmp(&hdev->random_addr, &hdev->rpa)) |
| 540 | return 0; |
| 541 | |
| 542 | err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa); |
| 543 | if (err < 0) { |
| 544 | BT_ERR("%s failed to generate new RPA", hdev->name); |
| 545 | return err; |
| 546 | } |
| 547 | |
| 548 | set_random_addr(req, &hdev->rpa); |
| 549 | |
| 550 | to = msecs_to_jiffies(hdev->rpa_timeout * 1000); |
| 551 | queue_delayed_work(hdev->workqueue, &hdev->rpa_expired, to); |
| 552 | |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | /* In case of required privacy without resolvable private address, |
| 557 | * use an non-resolvable private address. This is useful for active |
| 558 | * scanning and non-connectable advertising. |
| 559 | */ |
| 560 | if (require_privacy) { |
| 561 | bdaddr_t nrpa; |
| 562 | |
| 563 | while (true) { |
| 564 | /* The non-resolvable private address is generated |
| 565 | * from random six bytes with the two most significant |
| 566 | * bits cleared. |
| 567 | */ |
| 568 | get_random_bytes(&nrpa, 6); |
| 569 | nrpa.b[5] &= 0x3f; |
| 570 | |
| 571 | /* The non-resolvable private address shall not be |
| 572 | * equal to the public address. |
| 573 | */ |
| 574 | if (bacmp(&hdev->bdaddr, &nrpa)) |
| 575 | break; |
| 576 | } |
| 577 | |
| 578 | *own_addr_type = ADDR_LE_DEV_RANDOM; |
| 579 | set_random_addr(req, &nrpa); |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | /* If forcing static address is in use or there is no public |
| 584 | * address use the static address as random address (but skip |
| 585 | * the HCI command if the current random address is already the |
| 586 | * static one. |
Marcel Holtmann | 50b5b95 | 2014-12-19 23:05:35 +0100 | [diff] [blame] | 587 | * |
| 588 | * In case BR/EDR has been disabled on a dual-mode controller |
| 589 | * and a static address has been configured, then use that |
| 590 | * address instead of the public BR/EDR address. |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 591 | */ |
Marcel Holtmann | b7cb93e | 2015-03-13 10:20:35 -0700 | [diff] [blame] | 592 | if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) || |
Marcel Holtmann | 50b5b95 | 2014-12-19 23:05:35 +0100 | [diff] [blame] | 593 | !bacmp(&hdev->bdaddr, BDADDR_ANY) || |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 594 | (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) && |
Marcel Holtmann | 50b5b95 | 2014-12-19 23:05:35 +0100 | [diff] [blame] | 595 | bacmp(&hdev->static_addr, BDADDR_ANY))) { |
Johan Hedberg | 0857dd3 | 2014-12-19 13:40:20 +0200 | [diff] [blame] | 596 | *own_addr_type = ADDR_LE_DEV_RANDOM; |
| 597 | if (bacmp(&hdev->static_addr, &hdev->random_addr)) |
| 598 | hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, |
| 599 | &hdev->static_addr); |
| 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | /* Neither privacy nor static address is being used so use a |
| 604 | * public address. |
| 605 | */ |
| 606 | *own_addr_type = ADDR_LE_DEV_PUBLIC; |
| 607 | |
| 608 | return 0; |
| 609 | } |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 610 | |
Johan Hedberg | 405a261 | 2014-12-19 23:18:22 +0200 | [diff] [blame] | 611 | static bool disconnected_whitelist_entries(struct hci_dev *hdev) |
| 612 | { |
| 613 | struct bdaddr_list *b; |
| 614 | |
| 615 | list_for_each_entry(b, &hdev->whitelist, list) { |
| 616 | struct hci_conn *conn; |
| 617 | |
| 618 | conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &b->bdaddr); |
| 619 | if (!conn) |
| 620 | return true; |
| 621 | |
| 622 | if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG) |
| 623 | return true; |
| 624 | } |
| 625 | |
| 626 | return false; |
| 627 | } |
| 628 | |
| 629 | void __hci_update_page_scan(struct hci_request *req) |
| 630 | { |
| 631 | struct hci_dev *hdev = req->hdev; |
| 632 | u8 scan; |
| 633 | |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 634 | if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) |
Johan Hedberg | 405a261 | 2014-12-19 23:18:22 +0200 | [diff] [blame] | 635 | return; |
| 636 | |
| 637 | if (!hdev_is_powered(hdev)) |
| 638 | return; |
| 639 | |
| 640 | if (mgmt_powering_down(hdev)) |
| 641 | return; |
| 642 | |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 643 | if (hci_dev_test_flag(hdev, HCI_CONNECTABLE) || |
Johan Hedberg | 405a261 | 2014-12-19 23:18:22 +0200 | [diff] [blame] | 644 | disconnected_whitelist_entries(hdev)) |
| 645 | scan = SCAN_PAGE; |
| 646 | else |
| 647 | scan = SCAN_DISABLED; |
| 648 | |
| 649 | if (test_bit(HCI_PSCAN, &hdev->flags) == !!(scan & SCAN_PAGE)) |
| 650 | return; |
| 651 | |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 652 | if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE)) |
Johan Hedberg | 405a261 | 2014-12-19 23:18:22 +0200 | [diff] [blame] | 653 | scan |= SCAN_INQUIRY; |
| 654 | |
| 655 | hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan); |
| 656 | } |
| 657 | |
| 658 | void hci_update_page_scan(struct hci_dev *hdev) |
| 659 | { |
| 660 | struct hci_request req; |
| 661 | |
| 662 | hci_req_init(&req, hdev); |
| 663 | __hci_update_page_scan(&req); |
| 664 | hci_req_run(&req, NULL); |
| 665 | } |
| 666 | |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 667 | /* This function controls the background scanning based on hdev->pend_le_conns |
| 668 | * list. If there are pending LE connection we start the background scanning, |
| 669 | * otherwise we stop it. |
| 670 | * |
| 671 | * This function requires the caller holds hdev->lock. |
| 672 | */ |
| 673 | void __hci_update_background_scan(struct hci_request *req) |
| 674 | { |
| 675 | struct hci_dev *hdev = req->hdev; |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 676 | |
| 677 | if (!test_bit(HCI_UP, &hdev->flags) || |
| 678 | test_bit(HCI_INIT, &hdev->flags) || |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 679 | hci_dev_test_flag(hdev, HCI_SETUP) || |
| 680 | hci_dev_test_flag(hdev, HCI_CONFIG) || |
| 681 | hci_dev_test_flag(hdev, HCI_AUTO_OFF) || |
| 682 | hci_dev_test_flag(hdev, HCI_UNREGISTER)) |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 683 | return; |
| 684 | |
| 685 | /* No point in doing scanning if LE support hasn't been enabled */ |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 686 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 687 | return; |
| 688 | |
| 689 | /* If discovery is active don't interfere with it */ |
| 690 | if (hdev->discovery.state != DISCOVERY_STOPPED) |
| 691 | return; |
| 692 | |
| 693 | /* Reset RSSI and UUID filters when starting background scanning |
| 694 | * since these filters are meant for service discovery only. |
| 695 | * |
| 696 | * The Start Discovery and Start Service Discovery operations |
| 697 | * ensure to set proper values for RSSI threshold and UUID |
| 698 | * filter list. So it is safe to just reset them here. |
| 699 | */ |
| 700 | hci_discovery_filter_clear(hdev); |
| 701 | |
| 702 | if (list_empty(&hdev->pend_le_conns) && |
| 703 | list_empty(&hdev->pend_le_reports)) { |
| 704 | /* If there is no pending LE connections or devices |
| 705 | * to be scanned for, we should stop the background |
| 706 | * scanning. |
| 707 | */ |
| 708 | |
| 709 | /* If controller is not scanning we are done. */ |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 710 | if (!hci_dev_test_flag(hdev, HCI_LE_SCAN)) |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 711 | return; |
| 712 | |
| 713 | hci_req_add_le_scan_disable(req); |
| 714 | |
| 715 | BT_DBG("%s stopping background scanning", hdev->name); |
| 716 | } else { |
| 717 | /* If there is at least one pending LE connection, we should |
| 718 | * keep the background scan running. |
| 719 | */ |
| 720 | |
| 721 | /* If controller is connecting, we should not start scanning |
| 722 | * since some controllers are not able to scan and connect at |
| 723 | * the same time. |
| 724 | */ |
Jakub Pawlowski | e7d9ab7 | 2015-08-07 20:22:52 +0200 | [diff] [blame] | 725 | if (hci_lookup_le_connect(hdev)) |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 726 | return; |
| 727 | |
| 728 | /* If controller is currently scanning, we stop it to ensure we |
| 729 | * don't miss any advertising (due to duplicates filter). |
| 730 | */ |
Marcel Holtmann | d7a5a11 | 2015-03-13 02:11:00 -0700 | [diff] [blame] | 731 | if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) |
Johan Hedberg | 2cf2221 | 2014-12-19 22:26:00 +0200 | [diff] [blame] | 732 | hci_req_add_le_scan_disable(req); |
| 733 | |
| 734 | hci_req_add_le_passive_scan(req); |
| 735 | |
| 736 | BT_DBG("%s starting background scanning", hdev->name); |
| 737 | } |
| 738 | } |
| 739 | |
Johan Hedberg | dcc0f0d | 2015-10-22 10:49:37 +0300 | [diff] [blame] | 740 | void __hci_abort_conn(struct hci_request *req, struct hci_conn *conn, |
| 741 | u8 reason) |
| 742 | { |
| 743 | switch (conn->state) { |
| 744 | case BT_CONNECTED: |
| 745 | case BT_CONFIG: |
| 746 | if (conn->type == AMP_LINK) { |
| 747 | struct hci_cp_disconn_phy_link cp; |
| 748 | |
| 749 | cp.phy_handle = HCI_PHY_HANDLE(conn->handle); |
| 750 | cp.reason = reason; |
| 751 | hci_req_add(req, HCI_OP_DISCONN_PHY_LINK, sizeof(cp), |
| 752 | &cp); |
| 753 | } else { |
| 754 | struct hci_cp_disconnect dc; |
| 755 | |
| 756 | dc.handle = cpu_to_le16(conn->handle); |
| 757 | dc.reason = reason; |
| 758 | hci_req_add(req, HCI_OP_DISCONNECT, sizeof(dc), &dc); |
| 759 | } |
| 760 | |
| 761 | conn->state = BT_DISCONN; |
| 762 | |
| 763 | break; |
| 764 | case BT_CONNECT: |
| 765 | if (conn->type == LE_LINK) { |
| 766 | if (test_bit(HCI_CONN_SCANNING, &conn->flags)) |
| 767 | break; |
| 768 | hci_req_add(req, HCI_OP_LE_CREATE_CONN_CANCEL, |
| 769 | 0, NULL); |
| 770 | } else if (conn->type == ACL_LINK) { |
| 771 | if (req->hdev->hci_ver < BLUETOOTH_VER_1_2) |
| 772 | break; |
| 773 | hci_req_add(req, HCI_OP_CREATE_CONN_CANCEL, |
| 774 | 6, &conn->dst); |
| 775 | } |
| 776 | break; |
| 777 | case BT_CONNECT2: |
| 778 | if (conn->type == ACL_LINK) { |
| 779 | struct hci_cp_reject_conn_req rej; |
| 780 | |
| 781 | bacpy(&rej.bdaddr, &conn->dst); |
| 782 | rej.reason = reason; |
| 783 | |
| 784 | hci_req_add(req, HCI_OP_REJECT_CONN_REQ, |
| 785 | sizeof(rej), &rej); |
| 786 | } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) { |
| 787 | struct hci_cp_reject_sync_conn_req rej; |
| 788 | |
| 789 | bacpy(&rej.bdaddr, &conn->dst); |
| 790 | |
| 791 | /* SCO rejection has its own limited set of |
| 792 | * allowed error values (0x0D-0x0F) which isn't |
| 793 | * compatible with most values passed to this |
| 794 | * function. To be safe hard-code one of the |
| 795 | * values that's suitable for SCO. |
| 796 | */ |
| 797 | rej.reason = HCI_ERROR_REMOTE_LOW_RESOURCES; |
| 798 | |
| 799 | hci_req_add(req, HCI_OP_REJECT_SYNC_CONN_REQ, |
| 800 | sizeof(rej), &rej); |
| 801 | } |
| 802 | break; |
| 803 | default: |
| 804 | conn->state = BT_CLOSED; |
| 805 | break; |
| 806 | } |
| 807 | } |
| 808 | |
| 809 | static void abort_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode) |
| 810 | { |
| 811 | if (status) |
| 812 | BT_DBG("Failed to abort connection: status 0x%2.2x", status); |
| 813 | } |
| 814 | |
| 815 | int hci_abort_conn(struct hci_conn *conn, u8 reason) |
| 816 | { |
| 817 | struct hci_request req; |
| 818 | int err; |
| 819 | |
| 820 | hci_req_init(&req, conn->hdev); |
| 821 | |
| 822 | __hci_abort_conn(&req, conn, reason); |
| 823 | |
| 824 | err = hci_req_run(&req, abort_conn_complete); |
| 825 | if (err && err != -ENODATA) { |
| 826 | BT_ERR("Failed to run HCI request: err %d", err); |
| 827 | return err; |
| 828 | } |
| 829 | |
| 830 | return 0; |
| 831 | } |
Johan Hedberg | 5fc16cc | 2015-11-11 08:11:16 +0200 | [diff] [blame] | 832 | |
Johan Hedberg | 2e93e53 | 2015-11-11 08:11:17 +0200 | [diff] [blame] | 833 | static void update_bg_scan(struct hci_request *req, unsigned long opt) |
| 834 | { |
| 835 | hci_dev_lock(req->hdev); |
| 836 | __hci_update_background_scan(req); |
| 837 | hci_dev_unlock(req->hdev); |
| 838 | } |
| 839 | |
| 840 | static void bg_scan_update(struct work_struct *work) |
| 841 | { |
| 842 | struct hci_dev *hdev = container_of(work, struct hci_dev, |
| 843 | bg_scan_update); |
Johan Hedberg | 84235d2 | 2015-11-11 08:11:20 +0200 | [diff] [blame^] | 844 | struct hci_conn *conn; |
| 845 | u8 status; |
| 846 | int err; |
Johan Hedberg | 2e93e53 | 2015-11-11 08:11:17 +0200 | [diff] [blame] | 847 | |
Johan Hedberg | 84235d2 | 2015-11-11 08:11:20 +0200 | [diff] [blame^] | 848 | err = hci_req_sync(hdev, update_bg_scan, 0, HCI_CMD_TIMEOUT, &status); |
| 849 | if (!err) |
| 850 | return; |
| 851 | |
| 852 | hci_dev_lock(hdev); |
| 853 | |
| 854 | conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT); |
| 855 | if (conn) |
| 856 | hci_le_conn_failed(conn, status); |
| 857 | |
| 858 | hci_dev_unlock(hdev); |
Johan Hedberg | 2e93e53 | 2015-11-11 08:11:17 +0200 | [diff] [blame] | 859 | } |
| 860 | |
Johan Hedberg | 5fc16cc | 2015-11-11 08:11:16 +0200 | [diff] [blame] | 861 | void hci_request_setup(struct hci_dev *hdev) |
| 862 | { |
Johan Hedberg | 2e93e53 | 2015-11-11 08:11:17 +0200 | [diff] [blame] | 863 | INIT_WORK(&hdev->bg_scan_update, bg_scan_update); |
Johan Hedberg | 5fc16cc | 2015-11-11 08:11:16 +0200 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | void hci_request_cancel_all(struct hci_dev *hdev) |
| 867 | { |
Johan Hedberg | 2e93e53 | 2015-11-11 08:11:17 +0200 | [diff] [blame] | 868 | cancel_work_sync(&hdev->bg_scan_update); |
Johan Hedberg | 5fc16cc | 2015-11-11 08:11:16 +0200 | [diff] [blame] | 869 | } |