1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Scanning implementation 4 * 5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 6 * Copyright 2004, Instant802 Networks, Inc. 7 * Copyright 2005, Devicescape Software, Inc. 8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 10 * Copyright 2013-2015 Intel Mobile Communications GmbH 11 * Copyright 2016-2017 Intel Deutschland GmbH 12 * Copyright (C) 2018-2019 Intel Corporation 13 */ 14 15 #include <linux/if_arp.h> 16 #include <linux/etherdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <net/sch_generic.h> 19 #include <linux/slab.h> 20 #include <linux/export.h> 21 #include <linux/random.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "mesh.h" 27 28 #define IEEE80211_PROBE_DELAY (HZ / 33) 29 #define IEEE80211_CHANNEL_TIME (HZ / 33) 30 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) 31 32 void ieee80211_rx_bss_put(struct ieee80211_local *local, 33 struct ieee80211_bss *bss) 34 { 35 if (!bss) 36 return; 37 cfg80211_put_bss(local->hw.wiphy, 38 container_of((void *)bss, struct cfg80211_bss, priv)); 39 } 40 41 static bool is_uapsd_supported(struct ieee802_11_elems *elems) 42 { 43 u8 qos_info; 44 45 if (elems->wmm_info && elems->wmm_info_len == 7 46 && elems->wmm_info[5] == 1) 47 qos_info = elems->wmm_info[6]; 48 else if (elems->wmm_param && elems->wmm_param_len == 24 49 && elems->wmm_param[5] == 1) 50 qos_info = elems->wmm_param[6]; 51 else 52 /* no valid wmm information or parameter element found */ 53 return false; 54 55 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; 56 } 57 58 static void 59 ieee80211_update_bss_from_elems(struct ieee80211_local *local, 60 struct ieee80211_bss *bss, 61 struct ieee802_11_elems *elems, 62 struct ieee80211_rx_status *rx_status, 63 bool beacon) 64 { 65 int clen, srlen; 66 67 if (beacon) 68 bss->device_ts_beacon = rx_status->device_timestamp; 69 else 70 bss->device_ts_presp = rx_status->device_timestamp; 71 72 if (elems->parse_error) { 73 if (beacon) 74 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; 75 else 76 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; 77 } else { 78 if (beacon) 79 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 80 else 81 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 82 } 83 84 /* save the ERP value so that it is available at association time */ 85 if (elems->erp_info && (!elems->parse_error || 86 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 87 bss->erp_value = elems->erp_info[0]; 88 bss->has_erp_value = true; 89 if (!elems->parse_error) 90 bss->valid_data |= IEEE80211_BSS_VALID_ERP; 91 } 92 93 /* replace old supported rates if we get new values */ 94 if (!elems->parse_error || 95 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 96 srlen = 0; 97 if (elems->supp_rates) { 98 clen = IEEE80211_MAX_SUPP_RATES; 99 if (clen > elems->supp_rates_len) 100 clen = elems->supp_rates_len; 101 memcpy(bss->supp_rates, elems->supp_rates, clen); 102 srlen += clen; 103 } 104 if (elems->ext_supp_rates) { 105 clen = IEEE80211_MAX_SUPP_RATES - srlen; 106 if (clen > elems->ext_supp_rates_len) 107 clen = elems->ext_supp_rates_len; 108 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 109 clen); 110 srlen += clen; 111 } 112 if (srlen) { 113 bss->supp_rates_len = srlen; 114 if (!elems->parse_error) 115 bss->valid_data |= IEEE80211_BSS_VALID_RATES; 116 } 117 } 118 119 if (!elems->parse_error || 120 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 121 bss->wmm_used = elems->wmm_param || elems->wmm_info; 122 bss->uapsd_supported = is_uapsd_supported(elems); 123 if (!elems->parse_error) 124 bss->valid_data |= IEEE80211_BSS_VALID_WMM; 125 } 126 127 if (beacon) { 128 struct ieee80211_supported_band *sband = 129 local->hw.wiphy->bands[rx_status->band]; 130 if (!(rx_status->encoding == RX_ENC_HT) && 131 !(rx_status->encoding == RX_ENC_VHT)) 132 bss->beacon_rate = 133 &sband->bitrates[rx_status->rate_idx]; 134 } 135 } 136 137 struct ieee80211_bss * 138 ieee80211_bss_info_update(struct ieee80211_local *local, 139 struct ieee80211_rx_status *rx_status, 140 struct ieee80211_mgmt *mgmt, size_t len, 141 struct ieee80211_channel *channel) 142 { 143 bool beacon = ieee80211_is_beacon(mgmt->frame_control); 144 struct cfg80211_bss *cbss, *non_tx_cbss; 145 struct ieee80211_bss *bss, *non_tx_bss; 146 struct cfg80211_inform_bss bss_meta = { 147 .boottime_ns = rx_status->boottime_ns, 148 }; 149 bool signal_valid; 150 struct ieee80211_sub_if_data *scan_sdata; 151 struct ieee802_11_elems elems; 152 size_t baselen; 153 u8 *elements; 154 155 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) 156 bss_meta.signal = 0; /* invalid signal indication */ 157 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 158 bss_meta.signal = rx_status->signal * 100; 159 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) 160 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; 161 162 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20; 163 if (rx_status->bw == RATE_INFO_BW_5) 164 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; 165 else if (rx_status->bw == RATE_INFO_BW_10) 166 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; 167 168 bss_meta.chan = channel; 169 170 rcu_read_lock(); 171 scan_sdata = rcu_dereference(local->scan_sdata); 172 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && 173 scan_sdata->vif.bss_conf.assoc && 174 ieee80211_have_rx_timestamp(rx_status)) { 175 bss_meta.parent_tsf = 176 ieee80211_calculate_rx_timestamp(local, rx_status, 177 len + FCS_LEN, 24); 178 ether_addr_copy(bss_meta.parent_bssid, 179 scan_sdata->vif.bss_conf.bssid); 180 } 181 rcu_read_unlock(); 182 183 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, 184 mgmt, len, GFP_ATOMIC); 185 if (!cbss) 186 return NULL; 187 188 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 189 elements = mgmt->u.probe_resp.variable; 190 baselen = offsetof(struct ieee80211_mgmt, 191 u.probe_resp.variable); 192 } else { 193 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 194 elements = mgmt->u.beacon.variable; 195 } 196 197 if (baselen > len) 198 return NULL; 199 200 ieee802_11_parse_elems(elements, len - baselen, false, &elems, 201 mgmt->bssid, cbss->bssid); 202 203 /* In case the signal is invalid update the status */ 204 signal_valid = abs(channel->center_freq - cbss->channel->center_freq) 205 <= local->hw.wiphy->max_adj_channel_rssi_comp; 206 if (!signal_valid) 207 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; 208 209 bss = (void *)cbss->priv; 210 ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon); 211 212 list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) { 213 non_tx_bss = (void *)non_tx_cbss->priv; 214 215 ieee80211_update_bss_from_elems(local, non_tx_bss, &elems, 216 rx_status, beacon); 217 } 218 219 return bss; 220 } 221 222 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, 223 u32 scan_flags, const u8 *da) 224 { 225 if (!sdata) 226 return false; 227 /* accept broadcast for OCE */ 228 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && 229 is_broadcast_ether_addr(da)) 230 return true; 231 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 232 return true; 233 return ether_addr_equal(da, sdata->vif.addr); 234 } 235 236 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 237 { 238 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 239 struct ieee80211_sub_if_data *sdata1, *sdata2; 240 struct ieee80211_mgmt *mgmt = (void *)skb->data; 241 struct ieee80211_bss *bss; 242 struct ieee80211_channel *channel; 243 244 if (skb->len < 24 || 245 (!ieee80211_is_probe_resp(mgmt->frame_control) && 246 !ieee80211_is_beacon(mgmt->frame_control))) 247 return; 248 249 sdata1 = rcu_dereference(local->scan_sdata); 250 sdata2 = rcu_dereference(local->sched_scan_sdata); 251 252 if (likely(!sdata1 && !sdata2)) 253 return; 254 255 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 256 struct cfg80211_scan_request *scan_req; 257 struct cfg80211_sched_scan_request *sched_scan_req; 258 u32 scan_req_flags = 0, sched_scan_req_flags = 0; 259 260 scan_req = rcu_dereference(local->scan_req); 261 sched_scan_req = rcu_dereference(local->sched_scan_req); 262 263 if (scan_req) 264 scan_req_flags = scan_req->flags; 265 266 if (sched_scan_req) 267 sched_scan_req_flags = sched_scan_req->flags; 268 269 /* ignore ProbeResp to foreign address or non-bcast (OCE) 270 * unless scanning with randomised address 271 */ 272 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, 273 mgmt->da) && 274 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, 275 mgmt->da)) 276 return; 277 } 278 279 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 280 281 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 282 return; 283 284 bss = ieee80211_bss_info_update(local, rx_status, 285 mgmt, skb->len, 286 channel); 287 if (bss) 288 ieee80211_rx_bss_put(local, bss); 289 } 290 291 static void 292 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, 293 enum nl80211_bss_scan_width scan_width) 294 { 295 memset(chandef, 0, sizeof(*chandef)); 296 switch (scan_width) { 297 case NL80211_BSS_CHAN_WIDTH_5: 298 chandef->width = NL80211_CHAN_WIDTH_5; 299 break; 300 case NL80211_BSS_CHAN_WIDTH_10: 301 chandef->width = NL80211_CHAN_WIDTH_10; 302 break; 303 default: 304 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 305 break; 306 } 307 } 308 309 /* return false if no more work */ 310 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 311 { 312 struct cfg80211_scan_request *req; 313 struct cfg80211_chan_def chandef; 314 u8 bands_used = 0; 315 int i, ielen, n_chans; 316 u32 flags = 0; 317 318 req = rcu_dereference_protected(local->scan_req, 319 lockdep_is_held(&local->mtx)); 320 321 if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) 322 return false; 323 324 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 325 for (i = 0; i < req->n_channels; i++) { 326 local->hw_scan_req->req.channels[i] = req->channels[i]; 327 bands_used |= BIT(req->channels[i]->band); 328 } 329 330 n_chans = req->n_channels; 331 } else { 332 do { 333 if (local->hw_scan_band == NUM_NL80211_BANDS) 334 return false; 335 336 n_chans = 0; 337 338 for (i = 0; i < req->n_channels; i++) { 339 if (req->channels[i]->band != 340 local->hw_scan_band) 341 continue; 342 local->hw_scan_req->req.channels[n_chans] = 343 req->channels[i]; 344 n_chans++; 345 bands_used |= BIT(req->channels[i]->band); 346 } 347 348 local->hw_scan_band++; 349 } while (!n_chans); 350 } 351 352 local->hw_scan_req->req.n_channels = n_chans; 353 ieee80211_prepare_scan_chandef(&chandef, req->scan_width); 354 355 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 356 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 357 358 ielen = ieee80211_build_preq_ies(local, 359 (u8 *)local->hw_scan_req->req.ie, 360 local->hw_scan_ies_bufsize, 361 &local->hw_scan_req->ies, 362 req->ie, req->ie_len, 363 bands_used, req->rates, &chandef, 364 flags); 365 local->hw_scan_req->req.ie_len = ielen; 366 local->hw_scan_req->req.no_cck = req->no_cck; 367 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); 368 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, 369 req->mac_addr_mask); 370 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); 371 372 return true; 373 } 374 375 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 376 { 377 struct ieee80211_local *local = hw_to_local(hw); 378 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 379 bool was_scanning = local->scanning; 380 struct cfg80211_scan_request *scan_req; 381 struct ieee80211_sub_if_data *scan_sdata; 382 struct ieee80211_sub_if_data *sdata; 383 384 lockdep_assert_held(&local->mtx); 385 386 /* 387 * It's ok to abort a not-yet-running scan (that 388 * we have one at all will be verified by checking 389 * local->scan_req next), but not to complete it 390 * successfully. 391 */ 392 if (WARN_ON(!local->scanning && !aborted)) 393 aborted = true; 394 395 if (WARN_ON(!local->scan_req)) 396 return; 397 398 if (hw_scan && !aborted && 399 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && 400 ieee80211_prep_hw_scan(local)) { 401 int rc; 402 403 rc = drv_hw_scan(local, 404 rcu_dereference_protected(local->scan_sdata, 405 lockdep_is_held(&local->mtx)), 406 local->hw_scan_req); 407 408 if (rc == 0) 409 return; 410 411 /* HW scan failed and is going to be reported as aborted, 412 * so clear old scan info. 413 */ 414 memset(&local->scan_info, 0, sizeof(local->scan_info)); 415 aborted = true; 416 } 417 418 kfree(local->hw_scan_req); 419 local->hw_scan_req = NULL; 420 421 scan_req = rcu_dereference_protected(local->scan_req, 422 lockdep_is_held(&local->mtx)); 423 424 if (scan_req != local->int_scan_req) { 425 local->scan_info.aborted = aborted; 426 cfg80211_scan_done(scan_req, &local->scan_info); 427 } 428 RCU_INIT_POINTER(local->scan_req, NULL); 429 430 scan_sdata = rcu_dereference_protected(local->scan_sdata, 431 lockdep_is_held(&local->mtx)); 432 RCU_INIT_POINTER(local->scan_sdata, NULL); 433 434 local->scanning = 0; 435 local->scan_chandef.chan = NULL; 436 437 /* Set power back to normal operating levels. */ 438 ieee80211_hw_config(local, 0); 439 440 if (!hw_scan) { 441 ieee80211_configure_filter(local); 442 drv_sw_scan_complete(local, scan_sdata); 443 ieee80211_offchannel_return(local); 444 } 445 446 ieee80211_recalc_idle(local); 447 448 ieee80211_mlme_notify_scan_completed(local); 449 ieee80211_ibss_notify_scan_completed(local); 450 451 /* Requeue all the work that might have been ignored while 452 * the scan was in progress; if there was none this will 453 * just be a no-op for the particular interface. 454 */ 455 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 456 if (ieee80211_sdata_running(sdata)) 457 ieee80211_queue_work(&sdata->local->hw, &sdata->work); 458 } 459 460 if (was_scanning) 461 ieee80211_start_next_roc(local); 462 } 463 464 void ieee80211_scan_completed(struct ieee80211_hw *hw, 465 struct cfg80211_scan_info *info) 466 { 467 struct ieee80211_local *local = hw_to_local(hw); 468 469 trace_api_scan_completed(local, info->aborted); 470 471 set_bit(SCAN_COMPLETED, &local->scanning); 472 if (info->aborted) 473 set_bit(SCAN_ABORTED, &local->scanning); 474 475 memcpy(&local->scan_info, info, sizeof(*info)); 476 477 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); 478 } 479 EXPORT_SYMBOL(ieee80211_scan_completed); 480 481 static int ieee80211_start_sw_scan(struct ieee80211_local *local, 482 struct ieee80211_sub_if_data *sdata) 483 { 484 /* Software scan is not supported in multi-channel cases */ 485 if (local->use_chanctx) 486 return -EOPNOTSUPP; 487 488 /* 489 * Hardware/driver doesn't support hw_scan, so use software 490 * scanning instead. First send a nullfunc frame with power save 491 * bit on so that AP will buffer the frames for us while we are not 492 * listening, then send probe requests to each channel and wait for 493 * the responses. After all channels are scanned, tune back to the 494 * original channel and send a nullfunc frame with power save bit 495 * off to trigger the AP to send us all the buffered frames. 496 * 497 * Note that while local->sw_scanning is true everything else but 498 * nullfunc frames and probe requests will be dropped in 499 * ieee80211_tx_h_check_assoc(). 500 */ 501 drv_sw_scan_start(local, sdata, local->scan_addr); 502 503 local->leave_oper_channel_time = jiffies; 504 local->next_scan_state = SCAN_DECISION; 505 local->scan_channel_idx = 0; 506 507 ieee80211_offchannel_stop_vifs(local); 508 509 /* ensure nullfunc is transmitted before leaving operating channel */ 510 ieee80211_flush_queues(local, NULL, false); 511 512 ieee80211_configure_filter(local); 513 514 /* We need to set power level at maximum rate for scanning. */ 515 ieee80211_hw_config(local, 0); 516 517 ieee80211_queue_delayed_work(&local->hw, 518 &local->scan_work, 0); 519 520 return 0; 521 } 522 523 static bool ieee80211_can_scan(struct ieee80211_local *local, 524 struct ieee80211_sub_if_data *sdata) 525 { 526 if (ieee80211_is_radar_required(local)) 527 return false; 528 529 if (!list_empty(&local->roc_list)) 530 return false; 531 532 if (sdata->vif.type == NL80211_IFTYPE_STATION && 533 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 534 return false; 535 536 return true; 537 } 538 539 void ieee80211_run_deferred_scan(struct ieee80211_local *local) 540 { 541 lockdep_assert_held(&local->mtx); 542 543 if (!local->scan_req || local->scanning) 544 return; 545 546 if (!ieee80211_can_scan(local, 547 rcu_dereference_protected( 548 local->scan_sdata, 549 lockdep_is_held(&local->mtx)))) 550 return; 551 552 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 553 round_jiffies_relative(0)); 554 } 555 556 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 557 const u8 *src, const u8 *dst, 558 const u8 *ssid, size_t ssid_len, 559 const u8 *ie, size_t ie_len, 560 u32 ratemask, u32 flags, u32 tx_flags, 561 struct ieee80211_channel *channel) 562 { 563 struct sk_buff *skb; 564 u32 txdata_flags = 0; 565 566 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 567 ssid, ssid_len, 568 ie, ie_len, flags); 569 570 if (skb) { 571 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 572 struct ieee80211_hdr *hdr = (void *)skb->data; 573 u16 sn = get_random_u32(); 574 575 txdata_flags |= IEEE80211_TX_NO_SEQNO; 576 hdr->seq_ctrl = 577 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 578 } 579 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 580 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band, 581 txdata_flags); 582 } 583 } 584 585 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 586 unsigned long *next_delay) 587 { 588 int i; 589 struct ieee80211_sub_if_data *sdata; 590 struct cfg80211_scan_request *scan_req; 591 enum nl80211_band band = local->hw.conf.chandef.chan->band; 592 u32 flags = 0, tx_flags; 593 594 scan_req = rcu_dereference_protected(local->scan_req, 595 lockdep_is_held(&local->mtx)); 596 597 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 598 if (scan_req->no_cck) 599 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 600 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 601 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 602 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 603 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 604 605 sdata = rcu_dereference_protected(local->scan_sdata, 606 lockdep_is_held(&local->mtx)); 607 608 for (i = 0; i < scan_req->n_ssids; i++) 609 ieee80211_send_scan_probe_req( 610 sdata, local->scan_addr, scan_req->bssid, 611 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 612 scan_req->ie, scan_req->ie_len, 613 scan_req->rates[band], flags, 614 tx_flags, local->hw.conf.chandef.chan); 615 616 /* 617 * After sending probe requests, wait for probe responses 618 * on the channel. 619 */ 620 *next_delay = IEEE80211_CHANNEL_TIME; 621 local->next_scan_state = SCAN_DECISION; 622 } 623 624 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 625 struct cfg80211_scan_request *req) 626 { 627 struct ieee80211_local *local = sdata->local; 628 bool hw_scan = local->ops->hw_scan; 629 int rc; 630 631 lockdep_assert_held(&local->mtx); 632 633 if (local->scan_req || ieee80211_is_radar_required(local)) 634 return -EBUSY; 635 636 if (!ieee80211_can_scan(local, sdata)) { 637 /* wait for the work to finish/time out */ 638 rcu_assign_pointer(local->scan_req, req); 639 rcu_assign_pointer(local->scan_sdata, sdata); 640 return 0; 641 } 642 643 again: 644 if (hw_scan) { 645 u8 *ies; 646 647 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 648 649 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 650 int i, n_bands = 0; 651 u8 bands_counted = 0; 652 653 for (i = 0; i < req->n_channels; i++) { 654 if (bands_counted & BIT(req->channels[i]->band)) 655 continue; 656 bands_counted |= BIT(req->channels[i]->band); 657 n_bands++; 658 } 659 660 local->hw_scan_ies_bufsize *= n_bands; 661 } 662 663 local->hw_scan_req = kmalloc( 664 sizeof(*local->hw_scan_req) + 665 req->n_channels * sizeof(req->channels[0]) + 666 local->hw_scan_ies_bufsize, GFP_KERNEL); 667 if (!local->hw_scan_req) 668 return -ENOMEM; 669 670 local->hw_scan_req->req.ssids = req->ssids; 671 local->hw_scan_req->req.n_ssids = req->n_ssids; 672 ies = (u8 *)local->hw_scan_req + 673 sizeof(*local->hw_scan_req) + 674 req->n_channels * sizeof(req->channels[0]); 675 local->hw_scan_req->req.ie = ies; 676 local->hw_scan_req->req.flags = req->flags; 677 eth_broadcast_addr(local->hw_scan_req->req.bssid); 678 local->hw_scan_req->req.duration = req->duration; 679 local->hw_scan_req->req.duration_mandatory = 680 req->duration_mandatory; 681 682 local->hw_scan_band = 0; 683 684 /* 685 * After allocating local->hw_scan_req, we must 686 * go through until ieee80211_prep_hw_scan(), so 687 * anything that might be changed here and leave 688 * this function early must not go after this 689 * allocation. 690 */ 691 } 692 693 rcu_assign_pointer(local->scan_req, req); 694 rcu_assign_pointer(local->scan_sdata, sdata); 695 696 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 697 get_random_mask_addr(local->scan_addr, 698 req->mac_addr, 699 req->mac_addr_mask); 700 else 701 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 702 703 if (hw_scan) { 704 __set_bit(SCAN_HW_SCANNING, &local->scanning); 705 } else if ((req->n_channels == 1) && 706 (req->channels[0] == local->_oper_chandef.chan)) { 707 /* 708 * If we are scanning only on the operating channel 709 * then we do not need to stop normal activities 710 */ 711 unsigned long next_delay; 712 713 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 714 715 ieee80211_recalc_idle(local); 716 717 /* Notify driver scan is starting, keep order of operations 718 * same as normal software scan, in case that matters. */ 719 drv_sw_scan_start(local, sdata, local->scan_addr); 720 721 ieee80211_configure_filter(local); /* accept probe-responses */ 722 723 /* We need to ensure power level is at max for scanning. */ 724 ieee80211_hw_config(local, 0); 725 726 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 727 IEEE80211_CHAN_RADAR)) || 728 !req->n_ssids) { 729 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 730 } else { 731 ieee80211_scan_state_send_probe(local, &next_delay); 732 next_delay = IEEE80211_CHANNEL_TIME; 733 } 734 735 /* Now, just wait a bit and we are all done! */ 736 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 737 next_delay); 738 return 0; 739 } else { 740 /* Do normal software scan */ 741 __set_bit(SCAN_SW_SCANNING, &local->scanning); 742 } 743 744 ieee80211_recalc_idle(local); 745 746 if (hw_scan) { 747 WARN_ON(!ieee80211_prep_hw_scan(local)); 748 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 749 } else { 750 rc = ieee80211_start_sw_scan(local, sdata); 751 } 752 753 if (rc) { 754 kfree(local->hw_scan_req); 755 local->hw_scan_req = NULL; 756 local->scanning = 0; 757 758 ieee80211_recalc_idle(local); 759 760 local->scan_req = NULL; 761 RCU_INIT_POINTER(local->scan_sdata, NULL); 762 } 763 764 if (hw_scan && rc == 1) { 765 /* 766 * we can't fall back to software for P2P-GO 767 * as it must update NoA etc. 768 */ 769 if (ieee80211_vif_type_p2p(&sdata->vif) == 770 NL80211_IFTYPE_P2P_GO) 771 return -EOPNOTSUPP; 772 hw_scan = false; 773 goto again; 774 } 775 776 return rc; 777 } 778 779 static unsigned long 780 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 781 { 782 /* 783 * TODO: channel switching also consumes quite some time, 784 * add that delay as well to get a better estimation 785 */ 786 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 787 return IEEE80211_PASSIVE_CHANNEL_TIME; 788 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 789 } 790 791 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 792 unsigned long *next_delay) 793 { 794 bool associated = false; 795 bool tx_empty = true; 796 bool bad_latency; 797 struct ieee80211_sub_if_data *sdata; 798 struct ieee80211_channel *next_chan; 799 enum mac80211_scan_state next_scan_state; 800 struct cfg80211_scan_request *scan_req; 801 802 /* 803 * check if at least one STA interface is associated, 804 * check if at least one STA interface has pending tx frames 805 * and grab the lowest used beacon interval 806 */ 807 mutex_lock(&local->iflist_mtx); 808 list_for_each_entry(sdata, &local->interfaces, list) { 809 if (!ieee80211_sdata_running(sdata)) 810 continue; 811 812 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 813 if (sdata->u.mgd.associated) { 814 associated = true; 815 816 if (!qdisc_all_tx_empty(sdata->dev)) { 817 tx_empty = false; 818 break; 819 } 820 } 821 } 822 } 823 mutex_unlock(&local->iflist_mtx); 824 825 scan_req = rcu_dereference_protected(local->scan_req, 826 lockdep_is_held(&local->mtx)); 827 828 next_chan = scan_req->channels[local->scan_channel_idx]; 829 830 /* 831 * we're currently scanning a different channel, let's 832 * see if we can scan another channel without interfering 833 * with the current traffic situation. 834 * 835 * Keep good latency, do not stay off-channel more than 125 ms. 836 */ 837 838 bad_latency = time_after(jiffies + 839 ieee80211_scan_get_channel_time(next_chan), 840 local->leave_oper_channel_time + HZ / 8); 841 842 if (associated && !tx_empty) { 843 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 844 next_scan_state = SCAN_ABORT; 845 else 846 next_scan_state = SCAN_SUSPEND; 847 } else if (associated && bad_latency) { 848 next_scan_state = SCAN_SUSPEND; 849 } else { 850 next_scan_state = SCAN_SET_CHANNEL; 851 } 852 853 local->next_scan_state = next_scan_state; 854 855 *next_delay = 0; 856 } 857 858 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 859 unsigned long *next_delay) 860 { 861 int skip; 862 struct ieee80211_channel *chan; 863 enum nl80211_bss_scan_width oper_scan_width; 864 struct cfg80211_scan_request *scan_req; 865 866 scan_req = rcu_dereference_protected(local->scan_req, 867 lockdep_is_held(&local->mtx)); 868 869 skip = 0; 870 chan = scan_req->channels[local->scan_channel_idx]; 871 872 local->scan_chandef.chan = chan; 873 local->scan_chandef.center_freq1 = chan->center_freq; 874 local->scan_chandef.center_freq2 = 0; 875 switch (scan_req->scan_width) { 876 case NL80211_BSS_CHAN_WIDTH_5: 877 local->scan_chandef.width = NL80211_CHAN_WIDTH_5; 878 break; 879 case NL80211_BSS_CHAN_WIDTH_10: 880 local->scan_chandef.width = NL80211_CHAN_WIDTH_10; 881 break; 882 case NL80211_BSS_CHAN_WIDTH_20: 883 /* If scanning on oper channel, use whatever channel-type 884 * is currently in use. 885 */ 886 oper_scan_width = cfg80211_chandef_to_scan_width( 887 &local->_oper_chandef); 888 if (chan == local->_oper_chandef.chan && 889 oper_scan_width == scan_req->scan_width) 890 local->scan_chandef = local->_oper_chandef; 891 else 892 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 893 break; 894 } 895 896 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 897 skip = 1; 898 899 /* advance state machine to next channel/band */ 900 local->scan_channel_idx++; 901 902 if (skip) { 903 /* if we skip this channel return to the decision state */ 904 local->next_scan_state = SCAN_DECISION; 905 return; 906 } 907 908 /* 909 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 910 * (which unfortunately doesn't say _why_ step a) is done, 911 * but it waits for the probe delay or until a frame is 912 * received - and the received frame would update the NAV). 913 * For now, we do not support waiting until a frame is 914 * received. 915 * 916 * In any case, it is not necessary for a passive scan. 917 */ 918 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 919 !scan_req->n_ssids) { 920 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 921 local->next_scan_state = SCAN_DECISION; 922 return; 923 } 924 925 /* active scan, send probes */ 926 *next_delay = IEEE80211_PROBE_DELAY; 927 local->next_scan_state = SCAN_SEND_PROBE; 928 } 929 930 static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 931 unsigned long *next_delay) 932 { 933 /* switch back to the operating channel */ 934 local->scan_chandef.chan = NULL; 935 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 936 937 /* disable PS */ 938 ieee80211_offchannel_return(local); 939 940 *next_delay = HZ / 5; 941 /* afterwards, resume scan & go to next channel */ 942 local->next_scan_state = SCAN_RESUME; 943 } 944 945 static void ieee80211_scan_state_resume(struct ieee80211_local *local, 946 unsigned long *next_delay) 947 { 948 ieee80211_offchannel_stop_vifs(local); 949 950 if (local->ops->flush) { 951 ieee80211_flush_queues(local, NULL, false); 952 *next_delay = 0; 953 } else 954 *next_delay = HZ / 10; 955 956 /* remember when we left the operating channel */ 957 local->leave_oper_channel_time = jiffies; 958 959 /* advance to the next channel to be scanned */ 960 local->next_scan_state = SCAN_SET_CHANNEL; 961 } 962 963 void ieee80211_scan_work(struct work_struct *work) 964 { 965 struct ieee80211_local *local = 966 container_of(work, struct ieee80211_local, scan_work.work); 967 struct ieee80211_sub_if_data *sdata; 968 struct cfg80211_scan_request *scan_req; 969 unsigned long next_delay = 0; 970 bool aborted; 971 972 mutex_lock(&local->mtx); 973 974 if (!ieee80211_can_run_worker(local)) { 975 aborted = true; 976 goto out_complete; 977 } 978 979 sdata = rcu_dereference_protected(local->scan_sdata, 980 lockdep_is_held(&local->mtx)); 981 scan_req = rcu_dereference_protected(local->scan_req, 982 lockdep_is_held(&local->mtx)); 983 984 /* When scanning on-channel, the first-callback means completed. */ 985 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 986 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 987 goto out_complete; 988 } 989 990 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 991 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 992 goto out_complete; 993 } 994 995 if (!sdata || !scan_req) 996 goto out; 997 998 if (!local->scanning) { 999 int rc; 1000 1001 RCU_INIT_POINTER(local->scan_req, NULL); 1002 RCU_INIT_POINTER(local->scan_sdata, NULL); 1003 1004 rc = __ieee80211_start_scan(sdata, scan_req); 1005 if (rc) { 1006 /* need to complete scan in cfg80211 */ 1007 rcu_assign_pointer(local->scan_req, scan_req); 1008 aborted = true; 1009 goto out_complete; 1010 } else 1011 goto out; 1012 } 1013 1014 /* 1015 * as long as no delay is required advance immediately 1016 * without scheduling a new work 1017 */ 1018 do { 1019 if (!ieee80211_sdata_running(sdata)) { 1020 aborted = true; 1021 goto out_complete; 1022 } 1023 1024 switch (local->next_scan_state) { 1025 case SCAN_DECISION: 1026 /* if no more bands/channels left, complete scan */ 1027 if (local->scan_channel_idx >= scan_req->n_channels) { 1028 aborted = false; 1029 goto out_complete; 1030 } 1031 ieee80211_scan_state_decision(local, &next_delay); 1032 break; 1033 case SCAN_SET_CHANNEL: 1034 ieee80211_scan_state_set_channel(local, &next_delay); 1035 break; 1036 case SCAN_SEND_PROBE: 1037 ieee80211_scan_state_send_probe(local, &next_delay); 1038 break; 1039 case SCAN_SUSPEND: 1040 ieee80211_scan_state_suspend(local, &next_delay); 1041 break; 1042 case SCAN_RESUME: 1043 ieee80211_scan_state_resume(local, &next_delay); 1044 break; 1045 case SCAN_ABORT: 1046 aborted = true; 1047 goto out_complete; 1048 } 1049 } while (next_delay == 0); 1050 1051 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 1052 goto out; 1053 1054 out_complete: 1055 __ieee80211_scan_completed(&local->hw, aborted); 1056 out: 1057 mutex_unlock(&local->mtx); 1058 } 1059 1060 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1061 struct cfg80211_scan_request *req) 1062 { 1063 int res; 1064 1065 mutex_lock(&sdata->local->mtx); 1066 res = __ieee80211_start_scan(sdata, req); 1067 mutex_unlock(&sdata->local->mtx); 1068 1069 return res; 1070 } 1071 1072 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1073 const u8 *ssid, u8 ssid_len, 1074 struct ieee80211_channel **channels, 1075 unsigned int n_channels, 1076 enum nl80211_bss_scan_width scan_width) 1077 { 1078 struct ieee80211_local *local = sdata->local; 1079 int ret = -EBUSY, i, n_ch = 0; 1080 enum nl80211_band band; 1081 1082 mutex_lock(&local->mtx); 1083 1084 /* busy scanning */ 1085 if (local->scan_req) 1086 goto unlock; 1087 1088 /* fill internal scan request */ 1089 if (!channels) { 1090 int max_n; 1091 1092 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1093 if (!local->hw.wiphy->bands[band]) 1094 continue; 1095 1096 max_n = local->hw.wiphy->bands[band]->n_channels; 1097 for (i = 0; i < max_n; i++) { 1098 struct ieee80211_channel *tmp_ch = 1099 &local->hw.wiphy->bands[band]->channels[i]; 1100 1101 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1102 IEEE80211_CHAN_DISABLED)) 1103 continue; 1104 1105 local->int_scan_req->channels[n_ch] = tmp_ch; 1106 n_ch++; 1107 } 1108 } 1109 1110 if (WARN_ON_ONCE(n_ch == 0)) 1111 goto unlock; 1112 1113 local->int_scan_req->n_channels = n_ch; 1114 } else { 1115 for (i = 0; i < n_channels; i++) { 1116 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1117 IEEE80211_CHAN_DISABLED)) 1118 continue; 1119 1120 local->int_scan_req->channels[n_ch] = channels[i]; 1121 n_ch++; 1122 } 1123 1124 if (WARN_ON_ONCE(n_ch == 0)) 1125 goto unlock; 1126 1127 local->int_scan_req->n_channels = n_ch; 1128 } 1129 1130 local->int_scan_req->ssids = &local->scan_ssid; 1131 local->int_scan_req->n_ssids = 1; 1132 local->int_scan_req->scan_width = scan_width; 1133 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1134 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1135 1136 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1137 unlock: 1138 mutex_unlock(&local->mtx); 1139 return ret; 1140 } 1141 1142 /* 1143 * Only call this function when a scan can't be queued -- under RTNL. 1144 */ 1145 void ieee80211_scan_cancel(struct ieee80211_local *local) 1146 { 1147 /* 1148 * We are canceling software scan, or deferred scan that was not 1149 * yet really started (see __ieee80211_start_scan ). 1150 * 1151 * Regarding hardware scan: 1152 * - we can not call __ieee80211_scan_completed() as when 1153 * SCAN_HW_SCANNING bit is set this function change 1154 * local->hw_scan_req to operate on 5G band, what race with 1155 * driver which can use local->hw_scan_req 1156 * 1157 * - we can not cancel scan_work since driver can schedule it 1158 * by ieee80211_scan_completed(..., true) to finish scan 1159 * 1160 * Hence we only call the cancel_hw_scan() callback, but the low-level 1161 * driver is still responsible for calling ieee80211_scan_completed() 1162 * after the scan was completed/aborted. 1163 */ 1164 1165 mutex_lock(&local->mtx); 1166 if (!local->scan_req) 1167 goto out; 1168 1169 /* 1170 * We have a scan running and the driver already reported completion, 1171 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1172 * cancelled. 1173 */ 1174 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1175 test_bit(SCAN_COMPLETED, &local->scanning)) { 1176 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1177 goto out; 1178 } 1179 1180 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1181 /* 1182 * Make sure that __ieee80211_scan_completed doesn't trigger a 1183 * scan on another band. 1184 */ 1185 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1186 if (local->ops->cancel_hw_scan) 1187 drv_cancel_hw_scan(local, 1188 rcu_dereference_protected(local->scan_sdata, 1189 lockdep_is_held(&local->mtx))); 1190 goto out; 1191 } 1192 1193 /* 1194 * If the work is currently running, it must be blocked on 1195 * the mutex, but we'll set scan_sdata = NULL and it'll 1196 * simply exit once it acquires the mutex. 1197 */ 1198 cancel_delayed_work(&local->scan_work); 1199 /* and clean up */ 1200 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1201 __ieee80211_scan_completed(&local->hw, true); 1202 out: 1203 mutex_unlock(&local->mtx); 1204 } 1205 1206 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1207 struct cfg80211_sched_scan_request *req) 1208 { 1209 struct ieee80211_local *local = sdata->local; 1210 struct ieee80211_scan_ies sched_scan_ies = {}; 1211 struct cfg80211_chan_def chandef; 1212 int ret, i, iebufsz, num_bands = 0; 1213 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1214 u8 bands_used = 0; 1215 u8 *ie; 1216 u32 flags = 0; 1217 1218 iebufsz = local->scan_ies_len + req->ie_len; 1219 1220 lockdep_assert_held(&local->mtx); 1221 1222 if (!local->ops->sched_scan_start) 1223 return -ENOTSUPP; 1224 1225 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1226 if (local->hw.wiphy->bands[i]) { 1227 bands_used |= BIT(i); 1228 rate_masks[i] = (u32) -1; 1229 num_bands++; 1230 } 1231 } 1232 1233 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1234 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1235 1236 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1237 if (!ie) { 1238 ret = -ENOMEM; 1239 goto out; 1240 } 1241 1242 ieee80211_prepare_scan_chandef(&chandef, req->scan_width); 1243 1244 ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, 1245 &sched_scan_ies, req->ie, 1246 req->ie_len, bands_used, rate_masks, &chandef, 1247 flags); 1248 1249 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1250 if (ret == 0) { 1251 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1252 rcu_assign_pointer(local->sched_scan_req, req); 1253 } 1254 1255 kfree(ie); 1256 1257 out: 1258 if (ret) { 1259 /* Clean in case of failure after HW restart or upon resume. */ 1260 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1261 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1262 } 1263 1264 return ret; 1265 } 1266 1267 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1268 struct cfg80211_sched_scan_request *req) 1269 { 1270 struct ieee80211_local *local = sdata->local; 1271 int ret; 1272 1273 mutex_lock(&local->mtx); 1274 1275 if (rcu_access_pointer(local->sched_scan_sdata)) { 1276 mutex_unlock(&local->mtx); 1277 return -EBUSY; 1278 } 1279 1280 ret = __ieee80211_request_sched_scan_start(sdata, req); 1281 1282 mutex_unlock(&local->mtx); 1283 return ret; 1284 } 1285 1286 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1287 { 1288 struct ieee80211_sub_if_data *sched_scan_sdata; 1289 int ret = -ENOENT; 1290 1291 mutex_lock(&local->mtx); 1292 1293 if (!local->ops->sched_scan_stop) { 1294 ret = -ENOTSUPP; 1295 goto out; 1296 } 1297 1298 /* We don't want to restart sched scan anymore. */ 1299 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1300 1301 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1302 lockdep_is_held(&local->mtx)); 1303 if (sched_scan_sdata) { 1304 ret = drv_sched_scan_stop(local, sched_scan_sdata); 1305 if (!ret) 1306 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1307 } 1308 out: 1309 mutex_unlock(&local->mtx); 1310 1311 return ret; 1312 } 1313 1314 void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1315 { 1316 struct ieee80211_local *local = hw_to_local(hw); 1317 1318 trace_api_sched_scan_results(local); 1319 1320 cfg80211_sched_scan_results(hw->wiphy, 0); 1321 } 1322 EXPORT_SYMBOL(ieee80211_sched_scan_results); 1323 1324 void ieee80211_sched_scan_end(struct ieee80211_local *local) 1325 { 1326 mutex_lock(&local->mtx); 1327 1328 if (!rcu_access_pointer(local->sched_scan_sdata)) { 1329 mutex_unlock(&local->mtx); 1330 return; 1331 } 1332 1333 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1334 1335 /* If sched scan was aborted by the driver. */ 1336 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1337 1338 mutex_unlock(&local->mtx); 1339 1340 cfg80211_sched_scan_stopped(local->hw.wiphy, 0); 1341 } 1342 1343 void ieee80211_sched_scan_stopped_work(struct work_struct *work) 1344 { 1345 struct ieee80211_local *local = 1346 container_of(work, struct ieee80211_local, 1347 sched_scan_stopped_work); 1348 1349 ieee80211_sched_scan_end(local); 1350 } 1351 1352 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1353 { 1354 struct ieee80211_local *local = hw_to_local(hw); 1355 1356 trace_api_sched_scan_stopped(local); 1357 1358 /* 1359 * this shouldn't really happen, so for simplicity 1360 * simply ignore it, and let mac80211 reconfigure 1361 * the sched scan later on. 1362 */ 1363 if (local->in_reconfig) 1364 return; 1365 1366 schedule_work(&local->sched_scan_stopped_work); 1367 } 1368 EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1369