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_leave_ch(struct ieee80211_sub_if_data *sdata) 524 { 525 struct ieee80211_local *local = sdata->local; 526 struct ieee80211_sub_if_data *sdata_iter; 527 528 if (!ieee80211_is_radar_required(local)) 529 return true; 530 531 if (!regulatory_pre_cac_allowed(local->hw.wiphy)) 532 return false; 533 534 mutex_lock(&local->iflist_mtx); 535 list_for_each_entry(sdata_iter, &local->interfaces, list) { 536 if (sdata_iter->wdev.cac_started) { 537 mutex_unlock(&local->iflist_mtx); 538 return false; 539 } 540 } 541 mutex_unlock(&local->iflist_mtx); 542 543 return true; 544 } 545 546 static bool ieee80211_can_scan(struct ieee80211_local *local, 547 struct ieee80211_sub_if_data *sdata) 548 { 549 if (!__ieee80211_can_leave_ch(sdata)) 550 return false; 551 552 if (!list_empty(&local->roc_list)) 553 return false; 554 555 if (sdata->vif.type == NL80211_IFTYPE_STATION && 556 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 557 return false; 558 559 return true; 560 } 561 562 void ieee80211_run_deferred_scan(struct ieee80211_local *local) 563 { 564 lockdep_assert_held(&local->mtx); 565 566 if (!local->scan_req || local->scanning) 567 return; 568 569 if (!ieee80211_can_scan(local, 570 rcu_dereference_protected( 571 local->scan_sdata, 572 lockdep_is_held(&local->mtx)))) 573 return; 574 575 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 576 round_jiffies_relative(0)); 577 } 578 579 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 580 const u8 *src, const u8 *dst, 581 const u8 *ssid, size_t ssid_len, 582 const u8 *ie, size_t ie_len, 583 u32 ratemask, u32 flags, u32 tx_flags, 584 struct ieee80211_channel *channel) 585 { 586 struct sk_buff *skb; 587 u32 txdata_flags = 0; 588 589 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 590 ssid, ssid_len, 591 ie, ie_len, flags); 592 593 if (skb) { 594 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 595 struct ieee80211_hdr *hdr = (void *)skb->data; 596 u16 sn = get_random_u32(); 597 598 txdata_flags |= IEEE80211_TX_NO_SEQNO; 599 hdr->seq_ctrl = 600 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 601 } 602 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 603 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band, 604 txdata_flags); 605 } 606 } 607 608 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 609 unsigned long *next_delay) 610 { 611 int i; 612 struct ieee80211_sub_if_data *sdata; 613 struct cfg80211_scan_request *scan_req; 614 enum nl80211_band band = local->hw.conf.chandef.chan->band; 615 u32 flags = 0, tx_flags; 616 617 scan_req = rcu_dereference_protected(local->scan_req, 618 lockdep_is_held(&local->mtx)); 619 620 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 621 if (scan_req->no_cck) 622 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 623 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 624 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 625 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 626 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 627 628 sdata = rcu_dereference_protected(local->scan_sdata, 629 lockdep_is_held(&local->mtx)); 630 631 for (i = 0; i < scan_req->n_ssids; i++) 632 ieee80211_send_scan_probe_req( 633 sdata, local->scan_addr, scan_req->bssid, 634 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 635 scan_req->ie, scan_req->ie_len, 636 scan_req->rates[band], flags, 637 tx_flags, local->hw.conf.chandef.chan); 638 639 /* 640 * After sending probe requests, wait for probe responses 641 * on the channel. 642 */ 643 *next_delay = IEEE80211_CHANNEL_TIME; 644 local->next_scan_state = SCAN_DECISION; 645 } 646 647 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 648 struct cfg80211_scan_request *req) 649 { 650 struct ieee80211_local *local = sdata->local; 651 bool hw_scan = local->ops->hw_scan; 652 int rc; 653 654 lockdep_assert_held(&local->mtx); 655 656 if (local->scan_req) 657 return -EBUSY; 658 659 if (!__ieee80211_can_leave_ch(sdata)) 660 return -EBUSY; 661 662 if (!ieee80211_can_scan(local, sdata)) { 663 /* wait for the work to finish/time out */ 664 rcu_assign_pointer(local->scan_req, req); 665 rcu_assign_pointer(local->scan_sdata, sdata); 666 return 0; 667 } 668 669 again: 670 if (hw_scan) { 671 u8 *ies; 672 673 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 674 675 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 676 int i, n_bands = 0; 677 u8 bands_counted = 0; 678 679 for (i = 0; i < req->n_channels; i++) { 680 if (bands_counted & BIT(req->channels[i]->band)) 681 continue; 682 bands_counted |= BIT(req->channels[i]->band); 683 n_bands++; 684 } 685 686 local->hw_scan_ies_bufsize *= n_bands; 687 } 688 689 local->hw_scan_req = kmalloc( 690 sizeof(*local->hw_scan_req) + 691 req->n_channels * sizeof(req->channels[0]) + 692 local->hw_scan_ies_bufsize, GFP_KERNEL); 693 if (!local->hw_scan_req) 694 return -ENOMEM; 695 696 local->hw_scan_req->req.ssids = req->ssids; 697 local->hw_scan_req->req.n_ssids = req->n_ssids; 698 ies = (u8 *)local->hw_scan_req + 699 sizeof(*local->hw_scan_req) + 700 req->n_channels * sizeof(req->channels[0]); 701 local->hw_scan_req->req.ie = ies; 702 local->hw_scan_req->req.flags = req->flags; 703 eth_broadcast_addr(local->hw_scan_req->req.bssid); 704 local->hw_scan_req->req.duration = req->duration; 705 local->hw_scan_req->req.duration_mandatory = 706 req->duration_mandatory; 707 708 local->hw_scan_band = 0; 709 710 /* 711 * After allocating local->hw_scan_req, we must 712 * go through until ieee80211_prep_hw_scan(), so 713 * anything that might be changed here and leave 714 * this function early must not go after this 715 * allocation. 716 */ 717 } 718 719 rcu_assign_pointer(local->scan_req, req); 720 rcu_assign_pointer(local->scan_sdata, sdata); 721 722 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 723 get_random_mask_addr(local->scan_addr, 724 req->mac_addr, 725 req->mac_addr_mask); 726 else 727 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 728 729 if (hw_scan) { 730 __set_bit(SCAN_HW_SCANNING, &local->scanning); 731 } else if ((req->n_channels == 1) && 732 (req->channels[0] == local->_oper_chandef.chan)) { 733 /* 734 * If we are scanning only on the operating channel 735 * then we do not need to stop normal activities 736 */ 737 unsigned long next_delay; 738 739 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 740 741 ieee80211_recalc_idle(local); 742 743 /* Notify driver scan is starting, keep order of operations 744 * same as normal software scan, in case that matters. */ 745 drv_sw_scan_start(local, sdata, local->scan_addr); 746 747 ieee80211_configure_filter(local); /* accept probe-responses */ 748 749 /* We need to ensure power level is at max for scanning. */ 750 ieee80211_hw_config(local, 0); 751 752 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 753 IEEE80211_CHAN_RADAR)) || 754 !req->n_ssids) { 755 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 756 } else { 757 ieee80211_scan_state_send_probe(local, &next_delay); 758 next_delay = IEEE80211_CHANNEL_TIME; 759 } 760 761 /* Now, just wait a bit and we are all done! */ 762 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 763 next_delay); 764 return 0; 765 } else { 766 /* Do normal software scan */ 767 __set_bit(SCAN_SW_SCANNING, &local->scanning); 768 } 769 770 ieee80211_recalc_idle(local); 771 772 if (hw_scan) { 773 WARN_ON(!ieee80211_prep_hw_scan(local)); 774 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 775 } else { 776 rc = ieee80211_start_sw_scan(local, sdata); 777 } 778 779 if (rc) { 780 kfree(local->hw_scan_req); 781 local->hw_scan_req = NULL; 782 local->scanning = 0; 783 784 ieee80211_recalc_idle(local); 785 786 local->scan_req = NULL; 787 RCU_INIT_POINTER(local->scan_sdata, NULL); 788 } 789 790 if (hw_scan && rc == 1) { 791 /* 792 * we can't fall back to software for P2P-GO 793 * as it must update NoA etc. 794 */ 795 if (ieee80211_vif_type_p2p(&sdata->vif) == 796 NL80211_IFTYPE_P2P_GO) 797 return -EOPNOTSUPP; 798 hw_scan = false; 799 goto again; 800 } 801 802 return rc; 803 } 804 805 static unsigned long 806 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 807 { 808 /* 809 * TODO: channel switching also consumes quite some time, 810 * add that delay as well to get a better estimation 811 */ 812 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 813 return IEEE80211_PASSIVE_CHANNEL_TIME; 814 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 815 } 816 817 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 818 unsigned long *next_delay) 819 { 820 bool associated = false; 821 bool tx_empty = true; 822 bool bad_latency; 823 struct ieee80211_sub_if_data *sdata; 824 struct ieee80211_channel *next_chan; 825 enum mac80211_scan_state next_scan_state; 826 struct cfg80211_scan_request *scan_req; 827 828 /* 829 * check if at least one STA interface is associated, 830 * check if at least one STA interface has pending tx frames 831 * and grab the lowest used beacon interval 832 */ 833 mutex_lock(&local->iflist_mtx); 834 list_for_each_entry(sdata, &local->interfaces, list) { 835 if (!ieee80211_sdata_running(sdata)) 836 continue; 837 838 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 839 if (sdata->u.mgd.associated) { 840 associated = true; 841 842 if (!qdisc_all_tx_empty(sdata->dev)) { 843 tx_empty = false; 844 break; 845 } 846 } 847 } 848 } 849 mutex_unlock(&local->iflist_mtx); 850 851 scan_req = rcu_dereference_protected(local->scan_req, 852 lockdep_is_held(&local->mtx)); 853 854 next_chan = scan_req->channels[local->scan_channel_idx]; 855 856 /* 857 * we're currently scanning a different channel, let's 858 * see if we can scan another channel without interfering 859 * with the current traffic situation. 860 * 861 * Keep good latency, do not stay off-channel more than 125 ms. 862 */ 863 864 bad_latency = time_after(jiffies + 865 ieee80211_scan_get_channel_time(next_chan), 866 local->leave_oper_channel_time + HZ / 8); 867 868 if (associated && !tx_empty) { 869 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 870 next_scan_state = SCAN_ABORT; 871 else 872 next_scan_state = SCAN_SUSPEND; 873 } else if (associated && bad_latency) { 874 next_scan_state = SCAN_SUSPEND; 875 } else { 876 next_scan_state = SCAN_SET_CHANNEL; 877 } 878 879 local->next_scan_state = next_scan_state; 880 881 *next_delay = 0; 882 } 883 884 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 885 unsigned long *next_delay) 886 { 887 int skip; 888 struct ieee80211_channel *chan; 889 enum nl80211_bss_scan_width oper_scan_width; 890 struct cfg80211_scan_request *scan_req; 891 892 scan_req = rcu_dereference_protected(local->scan_req, 893 lockdep_is_held(&local->mtx)); 894 895 skip = 0; 896 chan = scan_req->channels[local->scan_channel_idx]; 897 898 local->scan_chandef.chan = chan; 899 local->scan_chandef.center_freq1 = chan->center_freq; 900 local->scan_chandef.center_freq2 = 0; 901 switch (scan_req->scan_width) { 902 case NL80211_BSS_CHAN_WIDTH_5: 903 local->scan_chandef.width = NL80211_CHAN_WIDTH_5; 904 break; 905 case NL80211_BSS_CHAN_WIDTH_10: 906 local->scan_chandef.width = NL80211_CHAN_WIDTH_10; 907 break; 908 case NL80211_BSS_CHAN_WIDTH_20: 909 /* If scanning on oper channel, use whatever channel-type 910 * is currently in use. 911 */ 912 oper_scan_width = cfg80211_chandef_to_scan_width( 913 &local->_oper_chandef); 914 if (chan == local->_oper_chandef.chan && 915 oper_scan_width == scan_req->scan_width) 916 local->scan_chandef = local->_oper_chandef; 917 else 918 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 919 break; 920 } 921 922 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 923 skip = 1; 924 925 /* advance state machine to next channel/band */ 926 local->scan_channel_idx++; 927 928 if (skip) { 929 /* if we skip this channel return to the decision state */ 930 local->next_scan_state = SCAN_DECISION; 931 return; 932 } 933 934 /* 935 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 936 * (which unfortunately doesn't say _why_ step a) is done, 937 * but it waits for the probe delay or until a frame is 938 * received - and the received frame would update the NAV). 939 * For now, we do not support waiting until a frame is 940 * received. 941 * 942 * In any case, it is not necessary for a passive scan. 943 */ 944 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 945 !scan_req->n_ssids) { 946 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 947 local->next_scan_state = SCAN_DECISION; 948 return; 949 } 950 951 /* active scan, send probes */ 952 *next_delay = IEEE80211_PROBE_DELAY; 953 local->next_scan_state = SCAN_SEND_PROBE; 954 } 955 956 static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 957 unsigned long *next_delay) 958 { 959 /* switch back to the operating channel */ 960 local->scan_chandef.chan = NULL; 961 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 962 963 /* disable PS */ 964 ieee80211_offchannel_return(local); 965 966 *next_delay = HZ / 5; 967 /* afterwards, resume scan & go to next channel */ 968 local->next_scan_state = SCAN_RESUME; 969 } 970 971 static void ieee80211_scan_state_resume(struct ieee80211_local *local, 972 unsigned long *next_delay) 973 { 974 ieee80211_offchannel_stop_vifs(local); 975 976 if (local->ops->flush) { 977 ieee80211_flush_queues(local, NULL, false); 978 *next_delay = 0; 979 } else 980 *next_delay = HZ / 10; 981 982 /* remember when we left the operating channel */ 983 local->leave_oper_channel_time = jiffies; 984 985 /* advance to the next channel to be scanned */ 986 local->next_scan_state = SCAN_SET_CHANNEL; 987 } 988 989 void ieee80211_scan_work(struct work_struct *work) 990 { 991 struct ieee80211_local *local = 992 container_of(work, struct ieee80211_local, scan_work.work); 993 struct ieee80211_sub_if_data *sdata; 994 struct cfg80211_scan_request *scan_req; 995 unsigned long next_delay = 0; 996 bool aborted; 997 998 mutex_lock(&local->mtx); 999 1000 if (!ieee80211_can_run_worker(local)) { 1001 aborted = true; 1002 goto out_complete; 1003 } 1004 1005 sdata = rcu_dereference_protected(local->scan_sdata, 1006 lockdep_is_held(&local->mtx)); 1007 scan_req = rcu_dereference_protected(local->scan_req, 1008 lockdep_is_held(&local->mtx)); 1009 1010 /* When scanning on-channel, the first-callback means completed. */ 1011 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 1012 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1013 goto out_complete; 1014 } 1015 1016 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 1017 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1018 goto out_complete; 1019 } 1020 1021 if (!sdata || !scan_req) 1022 goto out; 1023 1024 if (!local->scanning) { 1025 int rc; 1026 1027 RCU_INIT_POINTER(local->scan_req, NULL); 1028 RCU_INIT_POINTER(local->scan_sdata, NULL); 1029 1030 rc = __ieee80211_start_scan(sdata, scan_req); 1031 if (rc) { 1032 /* need to complete scan in cfg80211 */ 1033 rcu_assign_pointer(local->scan_req, scan_req); 1034 aborted = true; 1035 goto out_complete; 1036 } else 1037 goto out; 1038 } 1039 1040 /* 1041 * as long as no delay is required advance immediately 1042 * without scheduling a new work 1043 */ 1044 do { 1045 if (!ieee80211_sdata_running(sdata)) { 1046 aborted = true; 1047 goto out_complete; 1048 } 1049 1050 switch (local->next_scan_state) { 1051 case SCAN_DECISION: 1052 /* if no more bands/channels left, complete scan */ 1053 if (local->scan_channel_idx >= scan_req->n_channels) { 1054 aborted = false; 1055 goto out_complete; 1056 } 1057 ieee80211_scan_state_decision(local, &next_delay); 1058 break; 1059 case SCAN_SET_CHANNEL: 1060 ieee80211_scan_state_set_channel(local, &next_delay); 1061 break; 1062 case SCAN_SEND_PROBE: 1063 ieee80211_scan_state_send_probe(local, &next_delay); 1064 break; 1065 case SCAN_SUSPEND: 1066 ieee80211_scan_state_suspend(local, &next_delay); 1067 break; 1068 case SCAN_RESUME: 1069 ieee80211_scan_state_resume(local, &next_delay); 1070 break; 1071 case SCAN_ABORT: 1072 aborted = true; 1073 goto out_complete; 1074 } 1075 } while (next_delay == 0); 1076 1077 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 1078 goto out; 1079 1080 out_complete: 1081 __ieee80211_scan_completed(&local->hw, aborted); 1082 out: 1083 mutex_unlock(&local->mtx); 1084 } 1085 1086 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1087 struct cfg80211_scan_request *req) 1088 { 1089 int res; 1090 1091 mutex_lock(&sdata->local->mtx); 1092 res = __ieee80211_start_scan(sdata, req); 1093 mutex_unlock(&sdata->local->mtx); 1094 1095 return res; 1096 } 1097 1098 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1099 const u8 *ssid, u8 ssid_len, 1100 struct ieee80211_channel **channels, 1101 unsigned int n_channels, 1102 enum nl80211_bss_scan_width scan_width) 1103 { 1104 struct ieee80211_local *local = sdata->local; 1105 int ret = -EBUSY, i, n_ch = 0; 1106 enum nl80211_band band; 1107 1108 mutex_lock(&local->mtx); 1109 1110 /* busy scanning */ 1111 if (local->scan_req) 1112 goto unlock; 1113 1114 /* fill internal scan request */ 1115 if (!channels) { 1116 int max_n; 1117 1118 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1119 if (!local->hw.wiphy->bands[band]) 1120 continue; 1121 1122 max_n = local->hw.wiphy->bands[band]->n_channels; 1123 for (i = 0; i < max_n; i++) { 1124 struct ieee80211_channel *tmp_ch = 1125 &local->hw.wiphy->bands[band]->channels[i]; 1126 1127 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1128 IEEE80211_CHAN_DISABLED)) 1129 continue; 1130 1131 local->int_scan_req->channels[n_ch] = tmp_ch; 1132 n_ch++; 1133 } 1134 } 1135 1136 if (WARN_ON_ONCE(n_ch == 0)) 1137 goto unlock; 1138 1139 local->int_scan_req->n_channels = n_ch; 1140 } else { 1141 for (i = 0; i < n_channels; i++) { 1142 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1143 IEEE80211_CHAN_DISABLED)) 1144 continue; 1145 1146 local->int_scan_req->channels[n_ch] = channels[i]; 1147 n_ch++; 1148 } 1149 1150 if (WARN_ON_ONCE(n_ch == 0)) 1151 goto unlock; 1152 1153 local->int_scan_req->n_channels = n_ch; 1154 } 1155 1156 local->int_scan_req->ssids = &local->scan_ssid; 1157 local->int_scan_req->n_ssids = 1; 1158 local->int_scan_req->scan_width = scan_width; 1159 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1160 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1161 1162 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1163 unlock: 1164 mutex_unlock(&local->mtx); 1165 return ret; 1166 } 1167 1168 /* 1169 * Only call this function when a scan can't be queued -- under RTNL. 1170 */ 1171 void ieee80211_scan_cancel(struct ieee80211_local *local) 1172 { 1173 /* 1174 * We are canceling software scan, or deferred scan that was not 1175 * yet really started (see __ieee80211_start_scan ). 1176 * 1177 * Regarding hardware scan: 1178 * - we can not call __ieee80211_scan_completed() as when 1179 * SCAN_HW_SCANNING bit is set this function change 1180 * local->hw_scan_req to operate on 5G band, what race with 1181 * driver which can use local->hw_scan_req 1182 * 1183 * - we can not cancel scan_work since driver can schedule it 1184 * by ieee80211_scan_completed(..., true) to finish scan 1185 * 1186 * Hence we only call the cancel_hw_scan() callback, but the low-level 1187 * driver is still responsible for calling ieee80211_scan_completed() 1188 * after the scan was completed/aborted. 1189 */ 1190 1191 mutex_lock(&local->mtx); 1192 if (!local->scan_req) 1193 goto out; 1194 1195 /* 1196 * We have a scan running and the driver already reported completion, 1197 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1198 * cancelled. 1199 */ 1200 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1201 test_bit(SCAN_COMPLETED, &local->scanning)) { 1202 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1203 goto out; 1204 } 1205 1206 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1207 /* 1208 * Make sure that __ieee80211_scan_completed doesn't trigger a 1209 * scan on another band. 1210 */ 1211 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1212 if (local->ops->cancel_hw_scan) 1213 drv_cancel_hw_scan(local, 1214 rcu_dereference_protected(local->scan_sdata, 1215 lockdep_is_held(&local->mtx))); 1216 goto out; 1217 } 1218 1219 /* 1220 * If the work is currently running, it must be blocked on 1221 * the mutex, but we'll set scan_sdata = NULL and it'll 1222 * simply exit once it acquires the mutex. 1223 */ 1224 cancel_delayed_work(&local->scan_work); 1225 /* and clean up */ 1226 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1227 __ieee80211_scan_completed(&local->hw, true); 1228 out: 1229 mutex_unlock(&local->mtx); 1230 } 1231 1232 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1233 struct cfg80211_sched_scan_request *req) 1234 { 1235 struct ieee80211_local *local = sdata->local; 1236 struct ieee80211_scan_ies sched_scan_ies = {}; 1237 struct cfg80211_chan_def chandef; 1238 int ret, i, iebufsz, num_bands = 0; 1239 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1240 u8 bands_used = 0; 1241 u8 *ie; 1242 u32 flags = 0; 1243 1244 iebufsz = local->scan_ies_len + req->ie_len; 1245 1246 lockdep_assert_held(&local->mtx); 1247 1248 if (!local->ops->sched_scan_start) 1249 return -ENOTSUPP; 1250 1251 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1252 if (local->hw.wiphy->bands[i]) { 1253 bands_used |= BIT(i); 1254 rate_masks[i] = (u32) -1; 1255 num_bands++; 1256 } 1257 } 1258 1259 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1260 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1261 1262 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1263 if (!ie) { 1264 ret = -ENOMEM; 1265 goto out; 1266 } 1267 1268 ieee80211_prepare_scan_chandef(&chandef, req->scan_width); 1269 1270 ieee80211_build_preq_ies(local, ie, num_bands * iebufsz, 1271 &sched_scan_ies, req->ie, 1272 req->ie_len, bands_used, rate_masks, &chandef, 1273 flags); 1274 1275 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1276 if (ret == 0) { 1277 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1278 rcu_assign_pointer(local->sched_scan_req, req); 1279 } 1280 1281 kfree(ie); 1282 1283 out: 1284 if (ret) { 1285 /* Clean in case of failure after HW restart or upon resume. */ 1286 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1287 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1288 } 1289 1290 return ret; 1291 } 1292 1293 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1294 struct cfg80211_sched_scan_request *req) 1295 { 1296 struct ieee80211_local *local = sdata->local; 1297 int ret; 1298 1299 mutex_lock(&local->mtx); 1300 1301 if (rcu_access_pointer(local->sched_scan_sdata)) { 1302 mutex_unlock(&local->mtx); 1303 return -EBUSY; 1304 } 1305 1306 ret = __ieee80211_request_sched_scan_start(sdata, req); 1307 1308 mutex_unlock(&local->mtx); 1309 return ret; 1310 } 1311 1312 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1313 { 1314 struct ieee80211_sub_if_data *sched_scan_sdata; 1315 int ret = -ENOENT; 1316 1317 mutex_lock(&local->mtx); 1318 1319 if (!local->ops->sched_scan_stop) { 1320 ret = -ENOTSUPP; 1321 goto out; 1322 } 1323 1324 /* We don't want to restart sched scan anymore. */ 1325 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1326 1327 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1328 lockdep_is_held(&local->mtx)); 1329 if (sched_scan_sdata) { 1330 ret = drv_sched_scan_stop(local, sched_scan_sdata); 1331 if (!ret) 1332 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1333 } 1334 out: 1335 mutex_unlock(&local->mtx); 1336 1337 return ret; 1338 } 1339 1340 void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1341 { 1342 struct ieee80211_local *local = hw_to_local(hw); 1343 1344 trace_api_sched_scan_results(local); 1345 1346 cfg80211_sched_scan_results(hw->wiphy, 0); 1347 } 1348 EXPORT_SYMBOL(ieee80211_sched_scan_results); 1349 1350 void ieee80211_sched_scan_end(struct ieee80211_local *local) 1351 { 1352 mutex_lock(&local->mtx); 1353 1354 if (!rcu_access_pointer(local->sched_scan_sdata)) { 1355 mutex_unlock(&local->mtx); 1356 return; 1357 } 1358 1359 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1360 1361 /* If sched scan was aborted by the driver. */ 1362 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1363 1364 mutex_unlock(&local->mtx); 1365 1366 cfg80211_sched_scan_stopped(local->hw.wiphy, 0); 1367 } 1368 1369 void ieee80211_sched_scan_stopped_work(struct work_struct *work) 1370 { 1371 struct ieee80211_local *local = 1372 container_of(work, struct ieee80211_local, 1373 sched_scan_stopped_work); 1374 1375 ieee80211_sched_scan_end(local); 1376 } 1377 1378 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1379 { 1380 struct ieee80211_local *local = hw_to_local(hw); 1381 1382 trace_api_sched_scan_stopped(local); 1383 1384 /* 1385 * this shouldn't really happen, so for simplicity 1386 * simply ignore it, and let mac80211 reconfigure 1387 * the sched scan later on. 1388 */ 1389 if (local->in_reconfig) 1390 return; 1391 1392 schedule_work(&local->sched_scan_stopped_work); 1393 } 1394 EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1395