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) 2018-2023 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 struct inform_bss_update_data { 59 struct ieee80211_rx_status *rx_status; 60 bool beacon; 61 }; 62 63 void ieee80211_inform_bss(struct wiphy *wiphy, 64 struct cfg80211_bss *cbss, 65 const struct cfg80211_bss_ies *ies, 66 void *data) 67 { 68 struct ieee80211_local *local = wiphy_priv(wiphy); 69 struct inform_bss_update_data *update_data = data; 70 struct ieee80211_bss *bss = (void *)cbss->priv; 71 struct ieee80211_rx_status *rx_status; 72 struct ieee802_11_elems *elems; 73 int clen, srlen; 74 75 /* This happens while joining an IBSS */ 76 if (!update_data) 77 return; 78 79 elems = ieee802_11_parse_elems(ies->data, ies->len, false, NULL); 80 if (!elems) 81 return; 82 83 rx_status = update_data->rx_status; 84 85 if (update_data->beacon) 86 bss->device_ts_beacon = rx_status->device_timestamp; 87 else 88 bss->device_ts_presp = rx_status->device_timestamp; 89 90 if (elems->parse_error) { 91 if (update_data->beacon) 92 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; 93 else 94 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; 95 } else { 96 if (update_data->beacon) 97 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 98 else 99 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 100 } 101 102 /* save the ERP value so that it is available at association time */ 103 if (elems->erp_info && (!elems->parse_error || 104 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 105 bss->erp_value = elems->erp_info[0]; 106 bss->has_erp_value = true; 107 if (!elems->parse_error) 108 bss->valid_data |= IEEE80211_BSS_VALID_ERP; 109 } 110 111 /* replace old supported rates if we get new values */ 112 if (!elems->parse_error || 113 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 114 srlen = 0; 115 if (elems->supp_rates) { 116 clen = IEEE80211_MAX_SUPP_RATES; 117 if (clen > elems->supp_rates_len) 118 clen = elems->supp_rates_len; 119 memcpy(bss->supp_rates, elems->supp_rates, clen); 120 srlen += clen; 121 } 122 if (elems->ext_supp_rates) { 123 clen = IEEE80211_MAX_SUPP_RATES - srlen; 124 if (clen > elems->ext_supp_rates_len) 125 clen = elems->ext_supp_rates_len; 126 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 127 clen); 128 srlen += clen; 129 } 130 if (srlen) { 131 bss->supp_rates_len = srlen; 132 if (!elems->parse_error) 133 bss->valid_data |= IEEE80211_BSS_VALID_RATES; 134 } 135 } 136 137 if (!elems->parse_error || 138 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 139 bss->wmm_used = elems->wmm_param || elems->wmm_info; 140 bss->uapsd_supported = is_uapsd_supported(elems); 141 if (!elems->parse_error) 142 bss->valid_data |= IEEE80211_BSS_VALID_WMM; 143 } 144 145 if (update_data->beacon) { 146 struct ieee80211_supported_band *sband = 147 local->hw.wiphy->bands[rx_status->band]; 148 if (!(rx_status->encoding == RX_ENC_HT) && 149 !(rx_status->encoding == RX_ENC_VHT)) 150 bss->beacon_rate = 151 &sband->bitrates[rx_status->rate_idx]; 152 } 153 154 if (elems->vht_cap_elem) 155 bss->vht_cap_info = 156 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 157 else 158 bss->vht_cap_info = 0; 159 160 kfree(elems); 161 } 162 163 struct ieee80211_bss * 164 ieee80211_bss_info_update(struct ieee80211_local *local, 165 struct ieee80211_rx_status *rx_status, 166 struct ieee80211_mgmt *mgmt, size_t len, 167 struct ieee80211_channel *channel) 168 { 169 bool beacon = ieee80211_is_beacon(mgmt->frame_control) || 170 ieee80211_is_s1g_beacon(mgmt->frame_control); 171 struct cfg80211_bss *cbss; 172 struct inform_bss_update_data update_data = { 173 .rx_status = rx_status, 174 .beacon = beacon, 175 }; 176 struct cfg80211_inform_bss bss_meta = { 177 .boottime_ns = rx_status->boottime_ns, 178 .drv_data = (void *)&update_data, 179 }; 180 bool signal_valid; 181 struct ieee80211_sub_if_data *scan_sdata; 182 183 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) 184 bss_meta.signal = 0; /* invalid signal indication */ 185 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 186 bss_meta.signal = rx_status->signal * 100; 187 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) 188 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; 189 190 bss_meta.chan = channel; 191 192 rcu_read_lock(); 193 scan_sdata = rcu_dereference(local->scan_sdata); 194 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && 195 scan_sdata->vif.cfg.assoc && 196 ieee80211_have_rx_timestamp(rx_status)) { 197 bss_meta.parent_tsf = 198 ieee80211_calculate_rx_timestamp(local, rx_status, 199 len + FCS_LEN, 24); 200 ether_addr_copy(bss_meta.parent_bssid, 201 scan_sdata->vif.bss_conf.bssid); 202 } 203 rcu_read_unlock(); 204 205 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, 206 mgmt, len, GFP_ATOMIC); 207 if (!cbss) 208 return NULL; 209 210 /* In case the signal is invalid update the status */ 211 signal_valid = channel == cbss->channel; 212 if (!signal_valid) 213 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; 214 215 return (void *)cbss->priv; 216 } 217 218 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, 219 u32 scan_flags, const u8 *da) 220 { 221 if (!sdata) 222 return false; 223 /* accept broadcast for OCE */ 224 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && 225 is_broadcast_ether_addr(da)) 226 return true; 227 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 228 return true; 229 return ether_addr_equal(da, sdata->vif.addr); 230 } 231 232 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 233 { 234 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 235 struct ieee80211_sub_if_data *sdata1, *sdata2; 236 struct ieee80211_mgmt *mgmt = (void *)skb->data; 237 struct ieee80211_bss *bss; 238 struct ieee80211_channel *channel; 239 size_t min_hdr_len = offsetof(struct ieee80211_mgmt, 240 u.probe_resp.variable); 241 242 if (!ieee80211_is_probe_resp(mgmt->frame_control) && 243 !ieee80211_is_beacon(mgmt->frame_control) && 244 !ieee80211_is_s1g_beacon(mgmt->frame_control)) 245 return; 246 247 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { 248 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) 249 min_hdr_len = offsetof(struct ieee80211_ext, 250 u.s1g_short_beacon.variable); 251 else 252 min_hdr_len = offsetof(struct ieee80211_ext, 253 u.s1g_beacon); 254 } 255 256 if (skb->len < min_hdr_len) 257 return; 258 259 sdata1 = rcu_dereference(local->scan_sdata); 260 sdata2 = rcu_dereference(local->sched_scan_sdata); 261 262 if (likely(!sdata1 && !sdata2)) 263 return; 264 265 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) { 266 /* 267 * we were passive scanning because of radar/no-IR, but 268 * the beacon/proberesp rx gives us an opportunity to upgrade 269 * to active scan 270 */ 271 set_bit(SCAN_BEACON_DONE, &local->scanning); 272 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 273 } 274 275 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 276 struct cfg80211_scan_request *scan_req; 277 struct cfg80211_sched_scan_request *sched_scan_req; 278 u32 scan_req_flags = 0, sched_scan_req_flags = 0; 279 280 scan_req = rcu_dereference(local->scan_req); 281 sched_scan_req = rcu_dereference(local->sched_scan_req); 282 283 if (scan_req) 284 scan_req_flags = scan_req->flags; 285 286 if (sched_scan_req) 287 sched_scan_req_flags = sched_scan_req->flags; 288 289 /* ignore ProbeResp to foreign address or non-bcast (OCE) 290 * unless scanning with randomised address 291 */ 292 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, 293 mgmt->da) && 294 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, 295 mgmt->da)) 296 return; 297 } 298 299 channel = ieee80211_get_channel_khz(local->hw.wiphy, 300 ieee80211_rx_status_to_khz(rx_status)); 301 302 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 303 return; 304 305 bss = ieee80211_bss_info_update(local, rx_status, 306 mgmt, skb->len, 307 channel); 308 if (bss) 309 ieee80211_rx_bss_put(local, bss); 310 } 311 312 static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef) 313 { 314 memset(chandef, 0, sizeof(*chandef)); 315 316 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 317 } 318 319 /* return false if no more work */ 320 static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) 321 { 322 struct ieee80211_local *local = sdata->local; 323 struct cfg80211_scan_request *req; 324 struct cfg80211_chan_def chandef; 325 u8 bands_used = 0; 326 int i, ielen, n_chans; 327 u32 flags = 0; 328 329 req = rcu_dereference_protected(local->scan_req, 330 lockdep_is_held(&local->hw.wiphy->mtx)); 331 332 if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) 333 return false; 334 335 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 336 for (i = 0; i < req->n_channels; i++) { 337 local->hw_scan_req->req.channels[i] = req->channels[i]; 338 bands_used |= BIT(req->channels[i]->band); 339 } 340 341 n_chans = req->n_channels; 342 } else { 343 do { 344 if (local->hw_scan_band == NUM_NL80211_BANDS) 345 return false; 346 347 n_chans = 0; 348 349 for (i = 0; i < req->n_channels; i++) { 350 if (req->channels[i]->band != 351 local->hw_scan_band) 352 continue; 353 local->hw_scan_req->req.channels[n_chans] = 354 req->channels[i]; 355 n_chans++; 356 bands_used |= BIT(req->channels[i]->band); 357 } 358 359 local->hw_scan_band++; 360 } while (!n_chans); 361 } 362 363 local->hw_scan_req->req.n_channels = n_chans; 364 ieee80211_prepare_scan_chandef(&chandef); 365 366 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 367 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 368 369 ielen = ieee80211_build_preq_ies(sdata, 370 (u8 *)local->hw_scan_req->req.ie, 371 local->hw_scan_ies_bufsize, 372 &local->hw_scan_req->ies, 373 req->ie, req->ie_len, 374 bands_used, req->rates, &chandef, 375 flags); 376 local->hw_scan_req->req.ie_len = ielen; 377 local->hw_scan_req->req.no_cck = req->no_cck; 378 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); 379 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, 380 req->mac_addr_mask); 381 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); 382 383 return true; 384 } 385 386 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 387 { 388 struct ieee80211_local *local = hw_to_local(hw); 389 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 390 bool was_scanning = local->scanning; 391 struct cfg80211_scan_request *scan_req; 392 struct ieee80211_sub_if_data *scan_sdata; 393 struct ieee80211_sub_if_data *sdata; 394 395 lockdep_assert_wiphy(local->hw.wiphy); 396 397 /* 398 * It's ok to abort a not-yet-running scan (that 399 * we have one at all will be verified by checking 400 * local->scan_req next), but not to complete it 401 * successfully. 402 */ 403 if (WARN_ON(!local->scanning && !aborted)) 404 aborted = true; 405 406 if (WARN_ON(!local->scan_req)) 407 return; 408 409 scan_sdata = rcu_dereference_protected(local->scan_sdata, 410 lockdep_is_held(&local->hw.wiphy->mtx)); 411 412 if (hw_scan && !aborted && 413 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && 414 ieee80211_prep_hw_scan(scan_sdata)) { 415 int rc; 416 417 rc = drv_hw_scan(local, 418 rcu_dereference_protected(local->scan_sdata, 419 lockdep_is_held(&local->hw.wiphy->mtx)), 420 local->hw_scan_req); 421 422 if (rc == 0) 423 return; 424 425 /* HW scan failed and is going to be reported as aborted, 426 * so clear old scan info. 427 */ 428 memset(&local->scan_info, 0, sizeof(local->scan_info)); 429 aborted = true; 430 } 431 432 kfree(local->hw_scan_req); 433 local->hw_scan_req = NULL; 434 435 scan_req = rcu_dereference_protected(local->scan_req, 436 lockdep_is_held(&local->hw.wiphy->mtx)); 437 438 RCU_INIT_POINTER(local->scan_req, NULL); 439 RCU_INIT_POINTER(local->scan_sdata, NULL); 440 441 local->scanning = 0; 442 local->scan_chandef.chan = NULL; 443 444 synchronize_rcu(); 445 446 if (scan_req != local->int_scan_req) { 447 local->scan_info.aborted = aborted; 448 cfg80211_scan_done(scan_req, &local->scan_info); 449 } 450 451 /* Set power back to normal operating levels. */ 452 ieee80211_hw_config(local, 0); 453 454 if (!hw_scan && was_scanning) { 455 ieee80211_configure_filter(local); 456 drv_sw_scan_complete(local, scan_sdata); 457 ieee80211_offchannel_return(local); 458 } 459 460 ieee80211_recalc_idle(local); 461 462 ieee80211_mlme_notify_scan_completed(local); 463 ieee80211_ibss_notify_scan_completed(local); 464 465 /* Requeue all the work that might have been ignored while 466 * the scan was in progress; if there was none this will 467 * just be a no-op for the particular interface. 468 */ 469 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 470 if (ieee80211_sdata_running(sdata)) 471 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 472 } 473 474 if (was_scanning) 475 ieee80211_start_next_roc(local); 476 } 477 478 void ieee80211_scan_completed(struct ieee80211_hw *hw, 479 struct cfg80211_scan_info *info) 480 { 481 struct ieee80211_local *local = hw_to_local(hw); 482 483 trace_api_scan_completed(local, info->aborted); 484 485 set_bit(SCAN_COMPLETED, &local->scanning); 486 if (info->aborted) 487 set_bit(SCAN_ABORTED, &local->scanning); 488 489 memcpy(&local->scan_info, info, sizeof(*info)); 490 491 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 492 } 493 EXPORT_SYMBOL(ieee80211_scan_completed); 494 495 static int ieee80211_start_sw_scan(struct ieee80211_local *local, 496 struct ieee80211_sub_if_data *sdata) 497 { 498 /* Software scan is not supported in multi-channel cases */ 499 if (local->use_chanctx) 500 return -EOPNOTSUPP; 501 502 /* 503 * Hardware/driver doesn't support hw_scan, so use software 504 * scanning instead. First send a nullfunc frame with power save 505 * bit on so that AP will buffer the frames for us while we are not 506 * listening, then send probe requests to each channel and wait for 507 * the responses. After all channels are scanned, tune back to the 508 * original channel and send a nullfunc frame with power save bit 509 * off to trigger the AP to send us all the buffered frames. 510 * 511 * Note that while local->sw_scanning is true everything else but 512 * nullfunc frames and probe requests will be dropped in 513 * ieee80211_tx_h_check_assoc(). 514 */ 515 drv_sw_scan_start(local, sdata, local->scan_addr); 516 517 local->leave_oper_channel_time = jiffies; 518 local->next_scan_state = SCAN_DECISION; 519 local->scan_channel_idx = 0; 520 521 ieee80211_offchannel_stop_vifs(local); 522 523 /* ensure nullfunc is transmitted before leaving operating channel */ 524 ieee80211_flush_queues(local, NULL, false); 525 526 ieee80211_configure_filter(local); 527 528 /* We need to set power level at maximum rate for scanning. */ 529 ieee80211_hw_config(local, 0); 530 531 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 532 533 return 0; 534 } 535 536 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) 537 { 538 struct ieee80211_local *local = sdata->local; 539 struct ieee80211_sub_if_data *sdata_iter; 540 541 lockdep_assert_wiphy(local->hw.wiphy); 542 543 if (!ieee80211_is_radar_required(local)) 544 return true; 545 546 if (!regulatory_pre_cac_allowed(local->hw.wiphy)) 547 return false; 548 549 list_for_each_entry(sdata_iter, &local->interfaces, list) { 550 if (sdata_iter->wdev.cac_started) 551 return false; 552 } 553 554 return true; 555 } 556 557 static bool ieee80211_can_scan(struct ieee80211_local *local, 558 struct ieee80211_sub_if_data *sdata) 559 { 560 if (!__ieee80211_can_leave_ch(sdata)) 561 return false; 562 563 if (!list_empty(&local->roc_list)) 564 return false; 565 566 if (sdata->vif.type == NL80211_IFTYPE_STATION && 567 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 568 return false; 569 570 return true; 571 } 572 573 void ieee80211_run_deferred_scan(struct ieee80211_local *local) 574 { 575 lockdep_assert_wiphy(local->hw.wiphy); 576 577 if (!local->scan_req || local->scanning) 578 return; 579 580 if (!ieee80211_can_scan(local, 581 rcu_dereference_protected( 582 local->scan_sdata, 583 lockdep_is_held(&local->hw.wiphy->mtx)))) 584 return; 585 586 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 587 round_jiffies_relative(0)); 588 } 589 590 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 591 const u8 *src, const u8 *dst, 592 const u8 *ssid, size_t ssid_len, 593 const u8 *ie, size_t ie_len, 594 u32 ratemask, u32 flags, u32 tx_flags, 595 struct ieee80211_channel *channel) 596 { 597 struct sk_buff *skb; 598 599 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 600 ssid, ssid_len, 601 ie, ie_len, flags); 602 603 if (skb) { 604 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 605 struct ieee80211_hdr *hdr = (void *)skb->data; 606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 607 u16 sn = get_random_u16(); 608 609 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 610 hdr->seq_ctrl = 611 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 612 } 613 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 614 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); 615 } 616 } 617 618 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 619 unsigned long *next_delay) 620 { 621 int i; 622 struct ieee80211_sub_if_data *sdata; 623 struct cfg80211_scan_request *scan_req; 624 enum nl80211_band band = local->hw.conf.chandef.chan->band; 625 u32 flags = 0, tx_flags; 626 627 scan_req = rcu_dereference_protected(local->scan_req, 628 lockdep_is_held(&local->hw.wiphy->mtx)); 629 630 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 631 if (scan_req->no_cck) 632 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 633 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 634 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 635 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 636 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 637 638 sdata = rcu_dereference_protected(local->scan_sdata, 639 lockdep_is_held(&local->hw.wiphy->mtx)); 640 641 for (i = 0; i < scan_req->n_ssids; i++) 642 ieee80211_send_scan_probe_req( 643 sdata, local->scan_addr, scan_req->bssid, 644 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 645 scan_req->ie, scan_req->ie_len, 646 scan_req->rates[band], flags, 647 tx_flags, local->hw.conf.chandef.chan); 648 649 /* 650 * After sending probe requests, wait for probe responses 651 * on the channel. 652 */ 653 *next_delay = IEEE80211_CHANNEL_TIME; 654 local->next_scan_state = SCAN_DECISION; 655 } 656 657 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 658 struct cfg80211_scan_request *req) 659 { 660 struct ieee80211_local *local = sdata->local; 661 bool hw_scan = local->ops->hw_scan; 662 int rc; 663 664 lockdep_assert_wiphy(local->hw.wiphy); 665 666 if (local->scan_req) 667 return -EBUSY; 668 669 if (!__ieee80211_can_leave_ch(sdata)) 670 return -EBUSY; 671 672 if (!ieee80211_can_scan(local, sdata)) { 673 /* wait for the work to finish/time out */ 674 rcu_assign_pointer(local->scan_req, req); 675 rcu_assign_pointer(local->scan_sdata, sdata); 676 return 0; 677 } 678 679 again: 680 if (hw_scan) { 681 u8 *ies; 682 683 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 684 685 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 686 int i, n_bands = 0; 687 u8 bands_counted = 0; 688 689 for (i = 0; i < req->n_channels; i++) { 690 if (bands_counted & BIT(req->channels[i]->band)) 691 continue; 692 bands_counted |= BIT(req->channels[i]->band); 693 n_bands++; 694 } 695 696 local->hw_scan_ies_bufsize *= n_bands; 697 } 698 699 local->hw_scan_req = kmalloc( 700 sizeof(*local->hw_scan_req) + 701 req->n_channels * sizeof(req->channels[0]) + 702 local->hw_scan_ies_bufsize, GFP_KERNEL); 703 if (!local->hw_scan_req) 704 return -ENOMEM; 705 706 local->hw_scan_req->req.ssids = req->ssids; 707 local->hw_scan_req->req.n_ssids = req->n_ssids; 708 ies = (u8 *)local->hw_scan_req + 709 sizeof(*local->hw_scan_req) + 710 req->n_channels * sizeof(req->channels[0]); 711 local->hw_scan_req->req.ie = ies; 712 local->hw_scan_req->req.flags = req->flags; 713 eth_broadcast_addr(local->hw_scan_req->req.bssid); 714 local->hw_scan_req->req.duration = req->duration; 715 local->hw_scan_req->req.duration_mandatory = 716 req->duration_mandatory; 717 718 local->hw_scan_band = 0; 719 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; 720 local->hw_scan_req->req.scan_6ghz_params = 721 req->scan_6ghz_params; 722 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; 723 724 /* 725 * After allocating local->hw_scan_req, we must 726 * go through until ieee80211_prep_hw_scan(), so 727 * anything that might be changed here and leave 728 * this function early must not go after this 729 * allocation. 730 */ 731 } 732 733 rcu_assign_pointer(local->scan_req, req); 734 rcu_assign_pointer(local->scan_sdata, sdata); 735 736 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 737 get_random_mask_addr(local->scan_addr, 738 req->mac_addr, 739 req->mac_addr_mask); 740 else 741 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 742 743 if (hw_scan) { 744 __set_bit(SCAN_HW_SCANNING, &local->scanning); 745 } else if ((req->n_channels == 1) && 746 (req->channels[0] == local->_oper_chandef.chan)) { 747 /* 748 * If we are scanning only on the operating channel 749 * then we do not need to stop normal activities 750 */ 751 unsigned long next_delay; 752 753 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 754 755 ieee80211_recalc_idle(local); 756 757 /* Notify driver scan is starting, keep order of operations 758 * same as normal software scan, in case that matters. */ 759 drv_sw_scan_start(local, sdata, local->scan_addr); 760 761 ieee80211_configure_filter(local); /* accept probe-responses */ 762 763 /* We need to ensure power level is at max for scanning. */ 764 ieee80211_hw_config(local, 0); 765 766 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 767 IEEE80211_CHAN_RADAR)) || 768 !req->n_ssids) { 769 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 770 if (req->n_ssids) 771 set_bit(SCAN_BEACON_WAIT, &local->scanning); 772 } else { 773 ieee80211_scan_state_send_probe(local, &next_delay); 774 next_delay = IEEE80211_CHANNEL_TIME; 775 } 776 777 /* Now, just wait a bit and we are all done! */ 778 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 779 next_delay); 780 return 0; 781 } else { 782 /* Do normal software scan */ 783 __set_bit(SCAN_SW_SCANNING, &local->scanning); 784 } 785 786 ieee80211_recalc_idle(local); 787 788 if (hw_scan) { 789 WARN_ON(!ieee80211_prep_hw_scan(sdata)); 790 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 791 } else { 792 rc = ieee80211_start_sw_scan(local, sdata); 793 } 794 795 if (rc) { 796 kfree(local->hw_scan_req); 797 local->hw_scan_req = NULL; 798 local->scanning = 0; 799 800 ieee80211_recalc_idle(local); 801 802 local->scan_req = NULL; 803 RCU_INIT_POINTER(local->scan_sdata, NULL); 804 } 805 806 if (hw_scan && rc == 1) { 807 /* 808 * we can't fall back to software for P2P-GO 809 * as it must update NoA etc. 810 */ 811 if (ieee80211_vif_type_p2p(&sdata->vif) == 812 NL80211_IFTYPE_P2P_GO) 813 return -EOPNOTSUPP; 814 hw_scan = false; 815 goto again; 816 } 817 818 return rc; 819 } 820 821 static unsigned long 822 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 823 { 824 /* 825 * TODO: channel switching also consumes quite some time, 826 * add that delay as well to get a better estimation 827 */ 828 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 829 return IEEE80211_PASSIVE_CHANNEL_TIME; 830 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 831 } 832 833 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 834 unsigned long *next_delay) 835 { 836 bool associated = false; 837 bool tx_empty = true; 838 bool bad_latency; 839 struct ieee80211_sub_if_data *sdata; 840 struct ieee80211_channel *next_chan; 841 enum mac80211_scan_state next_scan_state; 842 struct cfg80211_scan_request *scan_req; 843 844 lockdep_assert_wiphy(local->hw.wiphy); 845 846 /* 847 * check if at least one STA interface is associated, 848 * check if at least one STA interface has pending tx frames 849 * and grab the lowest used beacon interval 850 */ 851 list_for_each_entry(sdata, &local->interfaces, list) { 852 if (!ieee80211_sdata_running(sdata)) 853 continue; 854 855 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 856 if (sdata->u.mgd.associated) { 857 associated = true; 858 859 if (!qdisc_all_tx_empty(sdata->dev)) { 860 tx_empty = false; 861 break; 862 } 863 } 864 } 865 } 866 867 scan_req = rcu_dereference_protected(local->scan_req, 868 lockdep_is_held(&local->hw.wiphy->mtx)); 869 870 next_chan = scan_req->channels[local->scan_channel_idx]; 871 872 /* 873 * we're currently scanning a different channel, let's 874 * see if we can scan another channel without interfering 875 * with the current traffic situation. 876 * 877 * Keep good latency, do not stay off-channel more than 125 ms. 878 */ 879 880 bad_latency = time_after(jiffies + 881 ieee80211_scan_get_channel_time(next_chan), 882 local->leave_oper_channel_time + HZ / 8); 883 884 if (associated && !tx_empty) { 885 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 886 next_scan_state = SCAN_ABORT; 887 else 888 next_scan_state = SCAN_SUSPEND; 889 } else if (associated && bad_latency) { 890 next_scan_state = SCAN_SUSPEND; 891 } else { 892 next_scan_state = SCAN_SET_CHANNEL; 893 } 894 895 local->next_scan_state = next_scan_state; 896 897 *next_delay = 0; 898 } 899 900 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 901 unsigned long *next_delay) 902 { 903 int skip; 904 struct ieee80211_channel *chan; 905 struct cfg80211_scan_request *scan_req; 906 907 scan_req = rcu_dereference_protected(local->scan_req, 908 lockdep_is_held(&local->hw.wiphy->mtx)); 909 910 skip = 0; 911 chan = scan_req->channels[local->scan_channel_idx]; 912 913 local->scan_chandef.chan = chan; 914 local->scan_chandef.center_freq1 = chan->center_freq; 915 local->scan_chandef.freq1_offset = chan->freq_offset; 916 local->scan_chandef.center_freq2 = 0; 917 918 /* For scanning on the S1G band, detect the channel width according to 919 * the channel being scanned. 920 */ 921 if (chan->band == NL80211_BAND_S1GHZ) { 922 local->scan_chandef.width = ieee80211_s1g_channel_width(chan); 923 goto set_channel; 924 } 925 926 /* If scanning on oper channel, use whatever channel-type 927 * is currently in use. 928 */ 929 if (chan == local->_oper_chandef.chan) 930 local->scan_chandef = local->_oper_chandef; 931 else 932 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 933 934 set_channel: 935 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 936 skip = 1; 937 938 /* advance state machine to next channel/band */ 939 local->scan_channel_idx++; 940 941 if (skip) { 942 /* if we skip this channel return to the decision state */ 943 local->next_scan_state = SCAN_DECISION; 944 return; 945 } 946 947 /* 948 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 949 * (which unfortunately doesn't say _why_ step a) is done, 950 * but it waits for the probe delay or until a frame is 951 * received - and the received frame would update the NAV). 952 * For now, we do not support waiting until a frame is 953 * received. 954 * 955 * In any case, it is not necessary for a passive scan. 956 */ 957 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 958 !scan_req->n_ssids) { 959 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 960 local->next_scan_state = SCAN_DECISION; 961 if (scan_req->n_ssids) 962 set_bit(SCAN_BEACON_WAIT, &local->scanning); 963 return; 964 } 965 966 /* active scan, send probes */ 967 *next_delay = IEEE80211_PROBE_DELAY; 968 local->next_scan_state = SCAN_SEND_PROBE; 969 } 970 971 static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 972 unsigned long *next_delay) 973 { 974 /* switch back to the operating channel */ 975 local->scan_chandef.chan = NULL; 976 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 977 978 /* disable PS */ 979 ieee80211_offchannel_return(local); 980 981 *next_delay = HZ / 5; 982 /* afterwards, resume scan & go to next channel */ 983 local->next_scan_state = SCAN_RESUME; 984 } 985 986 static void ieee80211_scan_state_resume(struct ieee80211_local *local, 987 unsigned long *next_delay) 988 { 989 ieee80211_offchannel_stop_vifs(local); 990 991 if (local->ops->flush) { 992 ieee80211_flush_queues(local, NULL, false); 993 *next_delay = 0; 994 } else 995 *next_delay = HZ / 10; 996 997 /* remember when we left the operating channel */ 998 local->leave_oper_channel_time = jiffies; 999 1000 /* advance to the next channel to be scanned */ 1001 local->next_scan_state = SCAN_SET_CHANNEL; 1002 } 1003 1004 void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) 1005 { 1006 struct ieee80211_local *local = 1007 container_of(work, struct ieee80211_local, scan_work.work); 1008 struct ieee80211_sub_if_data *sdata; 1009 struct cfg80211_scan_request *scan_req; 1010 unsigned long next_delay = 0; 1011 bool aborted; 1012 1013 lockdep_assert_wiphy(local->hw.wiphy); 1014 1015 if (!ieee80211_can_run_worker(local)) { 1016 aborted = true; 1017 goto out_complete; 1018 } 1019 1020 sdata = rcu_dereference_protected(local->scan_sdata, 1021 lockdep_is_held(&local->hw.wiphy->mtx)); 1022 scan_req = rcu_dereference_protected(local->scan_req, 1023 lockdep_is_held(&local->hw.wiphy->mtx)); 1024 1025 /* When scanning on-channel, the first-callback means completed. */ 1026 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 1027 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1028 goto out_complete; 1029 } 1030 1031 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 1032 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1033 goto out_complete; 1034 } 1035 1036 if (!sdata || !scan_req) 1037 return; 1038 1039 if (!local->scanning) { 1040 int rc; 1041 1042 RCU_INIT_POINTER(local->scan_req, NULL); 1043 RCU_INIT_POINTER(local->scan_sdata, NULL); 1044 1045 rc = __ieee80211_start_scan(sdata, scan_req); 1046 if (!rc) 1047 return; 1048 /* need to complete scan in cfg80211 */ 1049 rcu_assign_pointer(local->scan_req, scan_req); 1050 aborted = true; 1051 goto out_complete; 1052 } 1053 1054 clear_bit(SCAN_BEACON_WAIT, &local->scanning); 1055 1056 /* 1057 * as long as no delay is required advance immediately 1058 * without scheduling a new work 1059 */ 1060 do { 1061 if (!ieee80211_sdata_running(sdata)) { 1062 aborted = true; 1063 goto out_complete; 1064 } 1065 1066 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) && 1067 local->next_scan_state == SCAN_DECISION) 1068 local->next_scan_state = SCAN_SEND_PROBE; 1069 1070 switch (local->next_scan_state) { 1071 case SCAN_DECISION: 1072 /* if no more bands/channels left, complete scan */ 1073 if (local->scan_channel_idx >= scan_req->n_channels) { 1074 aborted = false; 1075 goto out_complete; 1076 } 1077 ieee80211_scan_state_decision(local, &next_delay); 1078 break; 1079 case SCAN_SET_CHANNEL: 1080 ieee80211_scan_state_set_channel(local, &next_delay); 1081 break; 1082 case SCAN_SEND_PROBE: 1083 ieee80211_scan_state_send_probe(local, &next_delay); 1084 break; 1085 case SCAN_SUSPEND: 1086 ieee80211_scan_state_suspend(local, &next_delay); 1087 break; 1088 case SCAN_RESUME: 1089 ieee80211_scan_state_resume(local, &next_delay); 1090 break; 1091 case SCAN_ABORT: 1092 aborted = true; 1093 goto out_complete; 1094 } 1095 } while (next_delay == 0); 1096 1097 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 1098 next_delay); 1099 return; 1100 1101 out_complete: 1102 __ieee80211_scan_completed(&local->hw, aborted); 1103 } 1104 1105 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1106 struct cfg80211_scan_request *req) 1107 { 1108 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1109 1110 return __ieee80211_start_scan(sdata, req); 1111 } 1112 1113 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1114 const u8 *ssid, u8 ssid_len, 1115 struct ieee80211_channel **channels, 1116 unsigned int n_channels) 1117 { 1118 struct ieee80211_local *local = sdata->local; 1119 int ret = -EBUSY, i, n_ch = 0; 1120 enum nl80211_band band; 1121 1122 lockdep_assert_wiphy(local->hw.wiphy); 1123 1124 /* busy scanning */ 1125 if (local->scan_req) 1126 goto unlock; 1127 1128 /* fill internal scan request */ 1129 if (!channels) { 1130 int max_n; 1131 1132 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1133 if (!local->hw.wiphy->bands[band] || 1134 band == NL80211_BAND_6GHZ) 1135 continue; 1136 1137 max_n = local->hw.wiphy->bands[band]->n_channels; 1138 for (i = 0; i < max_n; i++) { 1139 struct ieee80211_channel *tmp_ch = 1140 &local->hw.wiphy->bands[band]->channels[i]; 1141 1142 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1143 IEEE80211_CHAN_DISABLED)) 1144 continue; 1145 1146 local->int_scan_req->channels[n_ch] = tmp_ch; 1147 n_ch++; 1148 } 1149 } 1150 1151 if (WARN_ON_ONCE(n_ch == 0)) 1152 goto unlock; 1153 1154 local->int_scan_req->n_channels = n_ch; 1155 } else { 1156 for (i = 0; i < n_channels; i++) { 1157 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1158 IEEE80211_CHAN_DISABLED)) 1159 continue; 1160 1161 local->int_scan_req->channels[n_ch] = channels[i]; 1162 n_ch++; 1163 } 1164 1165 if (WARN_ON_ONCE(n_ch == 0)) 1166 goto unlock; 1167 1168 local->int_scan_req->n_channels = n_ch; 1169 } 1170 1171 local->int_scan_req->ssids = &local->scan_ssid; 1172 local->int_scan_req->n_ssids = 1; 1173 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1174 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1175 1176 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1177 unlock: 1178 return ret; 1179 } 1180 1181 void ieee80211_scan_cancel(struct ieee80211_local *local) 1182 { 1183 /* ensure a new scan cannot be queued */ 1184 lockdep_assert_wiphy(local->hw.wiphy); 1185 1186 /* 1187 * We are canceling software scan, or deferred scan that was not 1188 * yet really started (see __ieee80211_start_scan ). 1189 * 1190 * Regarding hardware scan: 1191 * - we can not call __ieee80211_scan_completed() as when 1192 * SCAN_HW_SCANNING bit is set this function change 1193 * local->hw_scan_req to operate on 5G band, what race with 1194 * driver which can use local->hw_scan_req 1195 * 1196 * - we can not cancel scan_work since driver can schedule it 1197 * by ieee80211_scan_completed(..., true) to finish scan 1198 * 1199 * Hence we only call the cancel_hw_scan() callback, but the low-level 1200 * driver is still responsible for calling ieee80211_scan_completed() 1201 * after the scan was completed/aborted. 1202 */ 1203 1204 if (!local->scan_req) 1205 return; 1206 1207 /* 1208 * We have a scan running and the driver already reported completion, 1209 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1210 * cancelled. 1211 */ 1212 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1213 test_bit(SCAN_COMPLETED, &local->scanning)) { 1214 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1215 return; 1216 } 1217 1218 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1219 /* 1220 * Make sure that __ieee80211_scan_completed doesn't trigger a 1221 * scan on another band. 1222 */ 1223 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1224 if (local->ops->cancel_hw_scan) 1225 drv_cancel_hw_scan(local, 1226 rcu_dereference_protected(local->scan_sdata, 1227 lockdep_is_held(&local->hw.wiphy->mtx))); 1228 return; 1229 } 1230 1231 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work); 1232 /* and clean up */ 1233 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1234 __ieee80211_scan_completed(&local->hw, true); 1235 } 1236 1237 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1238 struct cfg80211_sched_scan_request *req) 1239 { 1240 struct ieee80211_local *local = sdata->local; 1241 struct ieee80211_scan_ies sched_scan_ies = {}; 1242 struct cfg80211_chan_def chandef; 1243 int ret, i, iebufsz, num_bands = 0; 1244 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1245 u8 bands_used = 0; 1246 u8 *ie; 1247 u32 flags = 0; 1248 1249 lockdep_assert_wiphy(local->hw.wiphy); 1250 1251 iebufsz = local->scan_ies_len + req->ie_len; 1252 1253 if (!local->ops->sched_scan_start) 1254 return -ENOTSUPP; 1255 1256 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1257 if (local->hw.wiphy->bands[i]) { 1258 bands_used |= BIT(i); 1259 rate_masks[i] = (u32) -1; 1260 num_bands++; 1261 } 1262 } 1263 1264 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1265 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1266 1267 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1268 if (!ie) { 1269 ret = -ENOMEM; 1270 goto out; 1271 } 1272 1273 ieee80211_prepare_scan_chandef(&chandef); 1274 1275 ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, 1276 &sched_scan_ies, req->ie, 1277 req->ie_len, bands_used, rate_masks, &chandef, 1278 flags); 1279 1280 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1281 if (ret == 0) { 1282 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1283 rcu_assign_pointer(local->sched_scan_req, req); 1284 } 1285 1286 kfree(ie); 1287 1288 out: 1289 if (ret) { 1290 /* Clean in case of failure after HW restart or upon resume. */ 1291 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1292 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1293 } 1294 1295 return ret; 1296 } 1297 1298 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1299 struct cfg80211_sched_scan_request *req) 1300 { 1301 struct ieee80211_local *local = sdata->local; 1302 1303 lockdep_assert_wiphy(local->hw.wiphy); 1304 1305 if (rcu_access_pointer(local->sched_scan_sdata)) 1306 return -EBUSY; 1307 1308 return __ieee80211_request_sched_scan_start(sdata, req); 1309 } 1310 1311 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1312 { 1313 struct ieee80211_sub_if_data *sched_scan_sdata; 1314 int ret = -ENOENT; 1315 1316 lockdep_assert_wiphy(local->hw.wiphy); 1317 1318 if (!local->ops->sched_scan_stop) 1319 return -ENOTSUPP; 1320 1321 /* We don't want to restart sched scan anymore. */ 1322 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1323 1324 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1325 lockdep_is_held(&local->hw.wiphy->mtx)); 1326 if (sched_scan_sdata) { 1327 ret = drv_sched_scan_stop(local, sched_scan_sdata); 1328 if (!ret) 1329 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1330 } 1331 1332 return ret; 1333 } 1334 1335 void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1336 { 1337 struct ieee80211_local *local = hw_to_local(hw); 1338 1339 trace_api_sched_scan_results(local); 1340 1341 cfg80211_sched_scan_results(hw->wiphy, 0); 1342 } 1343 EXPORT_SYMBOL(ieee80211_sched_scan_results); 1344 1345 void ieee80211_sched_scan_end(struct ieee80211_local *local) 1346 { 1347 lockdep_assert_wiphy(local->hw.wiphy); 1348 1349 if (!rcu_access_pointer(local->sched_scan_sdata)) 1350 return; 1351 1352 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1353 1354 /* If sched scan was aborted by the driver. */ 1355 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1356 1357 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0); 1358 } 1359 1360 void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, 1361 struct wiphy_work *work) 1362 { 1363 struct ieee80211_local *local = 1364 container_of(work, struct ieee80211_local, 1365 sched_scan_stopped_work); 1366 1367 ieee80211_sched_scan_end(local); 1368 } 1369 1370 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1371 { 1372 struct ieee80211_local *local = hw_to_local(hw); 1373 1374 trace_api_sched_scan_stopped(local); 1375 1376 /* 1377 * this shouldn't really happen, so for simplicity 1378 * simply ignore it, and let mac80211 reconfigure 1379 * the sched scan later on. 1380 */ 1381 if (local->in_reconfig) 1382 return; 1383 1384 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work); 1385 } 1386 EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1387