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) 2018-2024 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 struct ieee80211_bss_conf *link_conf = NULL; 198 199 /* for an MLO connection, set the TSF data only in case we have 200 * an indication on which of the links the frame was received 201 */ 202 if (ieee80211_vif_is_mld(&scan_sdata->vif)) { 203 if (rx_status->link_valid) { 204 s8 link_id = rx_status->link_id; 205 206 link_conf = 207 rcu_dereference(scan_sdata->vif.link_conf[link_id]); 208 } 209 } else { 210 link_conf = &scan_sdata->vif.bss_conf; 211 } 212 213 if (link_conf) { 214 bss_meta.parent_tsf = 215 ieee80211_calculate_rx_timestamp(local, 216 rx_status, 217 len + FCS_LEN, 218 24); 219 220 ether_addr_copy(bss_meta.parent_bssid, 221 link_conf->bssid); 222 } 223 } 224 rcu_read_unlock(); 225 226 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, 227 mgmt, len, GFP_ATOMIC); 228 if (!cbss) 229 return NULL; 230 231 /* In case the signal is invalid update the status */ 232 signal_valid = channel == cbss->channel; 233 if (!signal_valid) 234 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; 235 236 return (void *)cbss->priv; 237 } 238 239 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, 240 struct ieee80211_channel *channel, 241 u32 scan_flags, const u8 *da) 242 { 243 if (!sdata) 244 return false; 245 246 /* accept broadcast on 6 GHz and for OCE */ 247 if (is_broadcast_ether_addr(da) && 248 (channel->band == NL80211_BAND_6GHZ || 249 scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP)) 250 return true; 251 252 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 253 return true; 254 return ether_addr_equal(da, sdata->vif.addr); 255 } 256 257 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 258 { 259 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 260 struct ieee80211_sub_if_data *sdata1, *sdata2; 261 struct ieee80211_mgmt *mgmt = (void *)skb->data; 262 struct ieee80211_bss *bss; 263 struct ieee80211_channel *channel; 264 size_t min_hdr_len = offsetof(struct ieee80211_mgmt, 265 u.probe_resp.variable); 266 267 if (!ieee80211_is_probe_resp(mgmt->frame_control) && 268 !ieee80211_is_beacon(mgmt->frame_control) && 269 !ieee80211_is_s1g_beacon(mgmt->frame_control)) 270 return; 271 272 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { 273 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) 274 min_hdr_len = offsetof(struct ieee80211_ext, 275 u.s1g_short_beacon.variable); 276 else 277 min_hdr_len = offsetof(struct ieee80211_ext, 278 u.s1g_beacon); 279 } 280 281 if (skb->len < min_hdr_len) 282 return; 283 284 sdata1 = rcu_dereference(local->scan_sdata); 285 sdata2 = rcu_dereference(local->sched_scan_sdata); 286 287 if (likely(!sdata1 && !sdata2)) 288 return; 289 290 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) { 291 /* 292 * we were passive scanning because of radar/no-IR, but 293 * the beacon/proberesp rx gives us an opportunity to upgrade 294 * to active scan 295 */ 296 set_bit(SCAN_BEACON_DONE, &local->scanning); 297 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 298 } 299 300 channel = ieee80211_get_channel_khz(local->hw.wiphy, 301 ieee80211_rx_status_to_khz(rx_status)); 302 303 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 304 return; 305 306 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 307 struct cfg80211_scan_request *scan_req; 308 struct cfg80211_sched_scan_request *sched_scan_req; 309 u32 scan_req_flags = 0, sched_scan_req_flags = 0; 310 311 scan_req = rcu_dereference(local->scan_req); 312 sched_scan_req = rcu_dereference(local->sched_scan_req); 313 314 if (scan_req) 315 scan_req_flags = scan_req->flags; 316 317 if (sched_scan_req) 318 sched_scan_req_flags = sched_scan_req->flags; 319 320 /* ignore ProbeResp to foreign address or non-bcast (OCE) 321 * unless scanning with randomised address 322 */ 323 if (!ieee80211_scan_accept_presp(sdata1, channel, 324 scan_req_flags, 325 mgmt->da) && 326 !ieee80211_scan_accept_presp(sdata2, channel, 327 sched_scan_req_flags, 328 mgmt->da)) 329 return; 330 } 331 332 bss = ieee80211_bss_info_update(local, rx_status, 333 mgmt, skb->len, 334 channel); 335 if (bss) 336 ieee80211_rx_bss_put(local, bss); 337 } 338 339 static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef) 340 { 341 memset(chandef, 0, sizeof(*chandef)); 342 343 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 344 } 345 346 /* return false if no more work */ 347 static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) 348 { 349 struct ieee80211_local *local = sdata->local; 350 struct cfg80211_scan_request *req; 351 struct cfg80211_chan_def chandef; 352 u8 bands_used = 0; 353 int i, ielen, n_chans; 354 u32 flags = 0; 355 356 req = rcu_dereference_protected(local->scan_req, 357 lockdep_is_held(&local->hw.wiphy->mtx)); 358 359 if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) 360 return false; 361 362 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 363 for (i = 0; i < req->n_channels; i++) { 364 local->hw_scan_req->req.channels[i] = req->channels[i]; 365 bands_used |= BIT(req->channels[i]->band); 366 } 367 368 n_chans = req->n_channels; 369 } else { 370 do { 371 if (local->hw_scan_band == NUM_NL80211_BANDS) 372 return false; 373 374 n_chans = 0; 375 376 for (i = 0; i < req->n_channels; i++) { 377 if (req->channels[i]->band != 378 local->hw_scan_band) 379 continue; 380 local->hw_scan_req->req.channels[n_chans] = 381 req->channels[i]; 382 n_chans++; 383 bands_used |= BIT(req->channels[i]->band); 384 } 385 386 local->hw_scan_band++; 387 } while (!n_chans); 388 } 389 390 local->hw_scan_req->req.n_channels = n_chans; 391 ieee80211_prepare_scan_chandef(&chandef); 392 393 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 394 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 395 396 ielen = ieee80211_build_preq_ies(sdata, 397 (u8 *)local->hw_scan_req->req.ie, 398 local->hw_scan_ies_bufsize, 399 &local->hw_scan_req->ies, 400 req->ie, req->ie_len, 401 bands_used, req->rates, &chandef, 402 flags); 403 local->hw_scan_req->req.ie_len = ielen; 404 local->hw_scan_req->req.no_cck = req->no_cck; 405 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); 406 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, 407 req->mac_addr_mask); 408 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); 409 410 return true; 411 } 412 413 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 414 { 415 struct ieee80211_local *local = hw_to_local(hw); 416 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 417 bool was_scanning = local->scanning; 418 struct cfg80211_scan_request *scan_req; 419 struct ieee80211_sub_if_data *scan_sdata; 420 struct ieee80211_sub_if_data *sdata; 421 422 lockdep_assert_wiphy(local->hw.wiphy); 423 424 /* 425 * It's ok to abort a not-yet-running scan (that 426 * we have one at all will be verified by checking 427 * local->scan_req next), but not to complete it 428 * successfully. 429 */ 430 if (WARN_ON(!local->scanning && !aborted)) 431 aborted = true; 432 433 if (WARN_ON(!local->scan_req)) 434 return; 435 436 scan_sdata = rcu_dereference_protected(local->scan_sdata, 437 lockdep_is_held(&local->hw.wiphy->mtx)); 438 439 if (hw_scan && !aborted && 440 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && 441 ieee80211_prep_hw_scan(scan_sdata)) { 442 int rc; 443 444 rc = drv_hw_scan(local, 445 rcu_dereference_protected(local->scan_sdata, 446 lockdep_is_held(&local->hw.wiphy->mtx)), 447 local->hw_scan_req); 448 449 if (rc == 0) 450 return; 451 452 /* HW scan failed and is going to be reported as aborted, 453 * so clear old scan info. 454 */ 455 memset(&local->scan_info, 0, sizeof(local->scan_info)); 456 aborted = true; 457 } 458 459 kfree(local->hw_scan_req); 460 local->hw_scan_req = NULL; 461 462 scan_req = rcu_dereference_protected(local->scan_req, 463 lockdep_is_held(&local->hw.wiphy->mtx)); 464 465 RCU_INIT_POINTER(local->scan_req, NULL); 466 RCU_INIT_POINTER(local->scan_sdata, NULL); 467 468 local->scanning = 0; 469 local->scan_chandef.chan = NULL; 470 471 synchronize_rcu(); 472 473 if (scan_req != local->int_scan_req) { 474 local->scan_info.aborted = aborted; 475 cfg80211_scan_done(scan_req, &local->scan_info); 476 } 477 478 /* Set power back to normal operating levels. */ 479 ieee80211_hw_config(local, 0); 480 481 if (!hw_scan && was_scanning) { 482 ieee80211_configure_filter(local); 483 drv_sw_scan_complete(local, scan_sdata); 484 ieee80211_offchannel_return(local); 485 } 486 487 ieee80211_recalc_idle(local); 488 489 ieee80211_mlme_notify_scan_completed(local); 490 ieee80211_ibss_notify_scan_completed(local); 491 492 /* Requeue all the work that might have been ignored while 493 * the scan was in progress; if there was none this will 494 * just be a no-op for the particular interface. 495 */ 496 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 497 if (ieee80211_sdata_running(sdata)) 498 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 499 } 500 501 if (was_scanning) 502 ieee80211_start_next_roc(local); 503 } 504 505 void ieee80211_scan_completed(struct ieee80211_hw *hw, 506 struct cfg80211_scan_info *info) 507 { 508 struct ieee80211_local *local = hw_to_local(hw); 509 510 trace_api_scan_completed(local, info->aborted); 511 512 set_bit(SCAN_COMPLETED, &local->scanning); 513 if (info->aborted) 514 set_bit(SCAN_ABORTED, &local->scanning); 515 516 memcpy(&local->scan_info, info, sizeof(*info)); 517 518 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 519 } 520 EXPORT_SYMBOL(ieee80211_scan_completed); 521 522 static int ieee80211_start_sw_scan(struct ieee80211_local *local, 523 struct ieee80211_sub_if_data *sdata) 524 { 525 /* Software scan is not supported in multi-channel cases */ 526 if (local->use_chanctx) 527 return -EOPNOTSUPP; 528 529 /* 530 * Hardware/driver doesn't support hw_scan, so use software 531 * scanning instead. First send a nullfunc frame with power save 532 * bit on so that AP will buffer the frames for us while we are not 533 * listening, then send probe requests to each channel and wait for 534 * the responses. After all channels are scanned, tune back to the 535 * original channel and send a nullfunc frame with power save bit 536 * off to trigger the AP to send us all the buffered frames. 537 * 538 * Note that while local->sw_scanning is true everything else but 539 * nullfunc frames and probe requests will be dropped in 540 * ieee80211_tx_h_check_assoc(). 541 */ 542 drv_sw_scan_start(local, sdata, local->scan_addr); 543 544 local->leave_oper_channel_time = jiffies; 545 local->next_scan_state = SCAN_DECISION; 546 local->scan_channel_idx = 0; 547 548 ieee80211_offchannel_stop_vifs(local); 549 550 /* ensure nullfunc is transmitted before leaving operating channel */ 551 ieee80211_flush_queues(local, NULL, false); 552 553 ieee80211_configure_filter(local); 554 555 /* We need to set power level at maximum rate for scanning. */ 556 ieee80211_hw_config(local, 0); 557 558 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 559 560 return 0; 561 } 562 563 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) 564 { 565 struct ieee80211_local *local = sdata->local; 566 struct ieee80211_sub_if_data *sdata_iter; 567 568 lockdep_assert_wiphy(local->hw.wiphy); 569 570 if (!ieee80211_is_radar_required(local)) 571 return true; 572 573 if (!regulatory_pre_cac_allowed(local->hw.wiphy)) 574 return false; 575 576 list_for_each_entry(sdata_iter, &local->interfaces, list) { 577 if (sdata_iter->wdev.cac_started) 578 return false; 579 } 580 581 return true; 582 } 583 584 static bool ieee80211_can_scan(struct ieee80211_local *local, 585 struct ieee80211_sub_if_data *sdata) 586 { 587 if (!__ieee80211_can_leave_ch(sdata)) 588 return false; 589 590 if (!list_empty(&local->roc_list)) 591 return false; 592 593 if (sdata->vif.type == NL80211_IFTYPE_STATION && 594 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 595 return false; 596 597 return true; 598 } 599 600 void ieee80211_run_deferred_scan(struct ieee80211_local *local) 601 { 602 lockdep_assert_wiphy(local->hw.wiphy); 603 604 if (!local->scan_req || local->scanning) 605 return; 606 607 if (!ieee80211_can_scan(local, 608 rcu_dereference_protected( 609 local->scan_sdata, 610 lockdep_is_held(&local->hw.wiphy->mtx)))) 611 return; 612 613 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 614 round_jiffies_relative(0)); 615 } 616 617 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 618 const u8 *src, const u8 *dst, 619 const u8 *ssid, size_t ssid_len, 620 const u8 *ie, size_t ie_len, 621 u32 ratemask, u32 flags, u32 tx_flags, 622 struct ieee80211_channel *channel) 623 { 624 struct sk_buff *skb; 625 626 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 627 ssid, ssid_len, 628 ie, ie_len, flags); 629 630 if (skb) { 631 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 632 struct ieee80211_hdr *hdr = (void *)skb->data; 633 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 634 u16 sn = get_random_u16(); 635 636 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 637 hdr->seq_ctrl = 638 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 639 } 640 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 641 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); 642 } 643 } 644 645 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 646 unsigned long *next_delay) 647 { 648 int i; 649 struct ieee80211_sub_if_data *sdata; 650 struct cfg80211_scan_request *scan_req; 651 enum nl80211_band band = local->hw.conf.chandef.chan->band; 652 u32 flags = 0, tx_flags; 653 654 scan_req = rcu_dereference_protected(local->scan_req, 655 lockdep_is_held(&local->hw.wiphy->mtx)); 656 657 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 658 if (scan_req->no_cck) 659 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 660 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 661 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 662 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 663 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 664 665 sdata = rcu_dereference_protected(local->scan_sdata, 666 lockdep_is_held(&local->hw.wiphy->mtx)); 667 668 for (i = 0; i < scan_req->n_ssids; i++) 669 ieee80211_send_scan_probe_req( 670 sdata, local->scan_addr, scan_req->bssid, 671 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 672 scan_req->ie, scan_req->ie_len, 673 scan_req->rates[band], flags, 674 tx_flags, local->hw.conf.chandef.chan); 675 676 /* 677 * After sending probe requests, wait for probe responses 678 * on the channel. 679 */ 680 *next_delay = IEEE80211_CHANNEL_TIME; 681 local->next_scan_state = SCAN_DECISION; 682 } 683 684 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 685 struct cfg80211_scan_request *req) 686 { 687 struct ieee80211_local *local = sdata->local; 688 bool hw_scan = local->ops->hw_scan; 689 int rc; 690 691 lockdep_assert_wiphy(local->hw.wiphy); 692 693 if (local->scan_req) 694 return -EBUSY; 695 696 /* For an MLO connection, if a link ID was specified, validate that it 697 * is indeed active. If no link ID was specified, select one of the 698 * active links. 699 */ 700 if (ieee80211_vif_is_mld(&sdata->vif)) { 701 if (req->tsf_report_link_id >= 0) { 702 if (!(sdata->vif.active_links & 703 BIT(req->tsf_report_link_id))) 704 return -EINVAL; 705 } else { 706 req->tsf_report_link_id = 707 __ffs(sdata->vif.active_links); 708 } 709 } 710 711 if (!__ieee80211_can_leave_ch(sdata)) 712 return -EBUSY; 713 714 if (!ieee80211_can_scan(local, sdata)) { 715 /* wait for the work to finish/time out */ 716 rcu_assign_pointer(local->scan_req, req); 717 rcu_assign_pointer(local->scan_sdata, sdata); 718 return 0; 719 } 720 721 again: 722 if (hw_scan) { 723 u8 *ies; 724 725 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 726 727 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 728 int i, n_bands = 0; 729 u8 bands_counted = 0; 730 731 for (i = 0; i < req->n_channels; i++) { 732 if (bands_counted & BIT(req->channels[i]->band)) 733 continue; 734 bands_counted |= BIT(req->channels[i]->band); 735 n_bands++; 736 } 737 738 local->hw_scan_ies_bufsize *= n_bands; 739 } 740 741 local->hw_scan_req = kmalloc( 742 sizeof(*local->hw_scan_req) + 743 req->n_channels * sizeof(req->channels[0]) + 744 local->hw_scan_ies_bufsize, GFP_KERNEL); 745 if (!local->hw_scan_req) 746 return -ENOMEM; 747 748 local->hw_scan_req->req.ssids = req->ssids; 749 local->hw_scan_req->req.n_ssids = req->n_ssids; 750 ies = (u8 *)local->hw_scan_req + 751 sizeof(*local->hw_scan_req) + 752 req->n_channels * sizeof(req->channels[0]); 753 local->hw_scan_req->req.ie = ies; 754 local->hw_scan_req->req.flags = req->flags; 755 eth_broadcast_addr(local->hw_scan_req->req.bssid); 756 local->hw_scan_req->req.duration = req->duration; 757 local->hw_scan_req->req.duration_mandatory = 758 req->duration_mandatory; 759 local->hw_scan_req->req.tsf_report_link_id = 760 req->tsf_report_link_id; 761 762 local->hw_scan_band = 0; 763 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; 764 local->hw_scan_req->req.scan_6ghz_params = 765 req->scan_6ghz_params; 766 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; 767 768 /* 769 * After allocating local->hw_scan_req, we must 770 * go through until ieee80211_prep_hw_scan(), so 771 * anything that might be changed here and leave 772 * this function early must not go after this 773 * allocation. 774 */ 775 } 776 777 rcu_assign_pointer(local->scan_req, req); 778 rcu_assign_pointer(local->scan_sdata, sdata); 779 780 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 781 get_random_mask_addr(local->scan_addr, 782 req->mac_addr, 783 req->mac_addr_mask); 784 else 785 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 786 787 if (hw_scan) { 788 __set_bit(SCAN_HW_SCANNING, &local->scanning); 789 } else if ((req->n_channels == 1) && 790 (req->channels[0] == local->_oper_chandef.chan)) { 791 /* 792 * If we are scanning only on the operating channel 793 * then we do not need to stop normal activities 794 */ 795 unsigned long next_delay; 796 797 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 798 799 ieee80211_recalc_idle(local); 800 801 /* Notify driver scan is starting, keep order of operations 802 * same as normal software scan, in case that matters. */ 803 drv_sw_scan_start(local, sdata, local->scan_addr); 804 805 ieee80211_configure_filter(local); /* accept probe-responses */ 806 807 /* We need to ensure power level is at max for scanning. */ 808 ieee80211_hw_config(local, 0); 809 810 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 811 IEEE80211_CHAN_RADAR)) || 812 !req->n_ssids) { 813 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 814 if (req->n_ssids) 815 set_bit(SCAN_BEACON_WAIT, &local->scanning); 816 } else { 817 ieee80211_scan_state_send_probe(local, &next_delay); 818 next_delay = IEEE80211_CHANNEL_TIME; 819 } 820 821 /* Now, just wait a bit and we are all done! */ 822 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 823 next_delay); 824 return 0; 825 } else { 826 /* Do normal software scan */ 827 __set_bit(SCAN_SW_SCANNING, &local->scanning); 828 } 829 830 ieee80211_recalc_idle(local); 831 832 if (hw_scan) { 833 WARN_ON(!ieee80211_prep_hw_scan(sdata)); 834 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 835 } else { 836 rc = ieee80211_start_sw_scan(local, sdata); 837 } 838 839 if (rc) { 840 kfree(local->hw_scan_req); 841 local->hw_scan_req = NULL; 842 local->scanning = 0; 843 844 ieee80211_recalc_idle(local); 845 846 local->scan_req = NULL; 847 RCU_INIT_POINTER(local->scan_sdata, NULL); 848 } 849 850 if (hw_scan && rc == 1) { 851 /* 852 * we can't fall back to software for P2P-GO 853 * as it must update NoA etc. 854 */ 855 if (ieee80211_vif_type_p2p(&sdata->vif) == 856 NL80211_IFTYPE_P2P_GO) 857 return -EOPNOTSUPP; 858 hw_scan = false; 859 goto again; 860 } 861 862 return rc; 863 } 864 865 static unsigned long 866 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 867 { 868 /* 869 * TODO: channel switching also consumes quite some time, 870 * add that delay as well to get a better estimation 871 */ 872 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 873 return IEEE80211_PASSIVE_CHANNEL_TIME; 874 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 875 } 876 877 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 878 unsigned long *next_delay) 879 { 880 bool associated = false; 881 bool tx_empty = true; 882 bool bad_latency; 883 struct ieee80211_sub_if_data *sdata; 884 struct ieee80211_channel *next_chan; 885 enum mac80211_scan_state next_scan_state; 886 struct cfg80211_scan_request *scan_req; 887 888 lockdep_assert_wiphy(local->hw.wiphy); 889 890 /* 891 * check if at least one STA interface is associated, 892 * check if at least one STA interface has pending tx frames 893 * and grab the lowest used beacon interval 894 */ 895 list_for_each_entry(sdata, &local->interfaces, list) { 896 if (!ieee80211_sdata_running(sdata)) 897 continue; 898 899 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 900 if (sdata->u.mgd.associated) { 901 associated = true; 902 903 if (!qdisc_all_tx_empty(sdata->dev)) { 904 tx_empty = false; 905 break; 906 } 907 } 908 } 909 } 910 911 scan_req = rcu_dereference_protected(local->scan_req, 912 lockdep_is_held(&local->hw.wiphy->mtx)); 913 914 next_chan = scan_req->channels[local->scan_channel_idx]; 915 916 /* 917 * we're currently scanning a different channel, let's 918 * see if we can scan another channel without interfering 919 * with the current traffic situation. 920 * 921 * Keep good latency, do not stay off-channel more than 125 ms. 922 */ 923 924 bad_latency = time_after(jiffies + 925 ieee80211_scan_get_channel_time(next_chan), 926 local->leave_oper_channel_time + HZ / 8); 927 928 if (associated && !tx_empty) { 929 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 930 next_scan_state = SCAN_ABORT; 931 else 932 next_scan_state = SCAN_SUSPEND; 933 } else if (associated && bad_latency) { 934 next_scan_state = SCAN_SUSPEND; 935 } else { 936 next_scan_state = SCAN_SET_CHANNEL; 937 } 938 939 local->next_scan_state = next_scan_state; 940 941 *next_delay = 0; 942 } 943 944 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 945 unsigned long *next_delay) 946 { 947 int skip; 948 struct ieee80211_channel *chan; 949 struct cfg80211_scan_request *scan_req; 950 951 scan_req = rcu_dereference_protected(local->scan_req, 952 lockdep_is_held(&local->hw.wiphy->mtx)); 953 954 skip = 0; 955 chan = scan_req->channels[local->scan_channel_idx]; 956 957 local->scan_chandef.chan = chan; 958 local->scan_chandef.center_freq1 = chan->center_freq; 959 local->scan_chandef.freq1_offset = chan->freq_offset; 960 local->scan_chandef.center_freq2 = 0; 961 962 /* For scanning on the S1G band, detect the channel width according to 963 * the channel being scanned. 964 */ 965 if (chan->band == NL80211_BAND_S1GHZ) { 966 local->scan_chandef.width = ieee80211_s1g_channel_width(chan); 967 goto set_channel; 968 } 969 970 /* If scanning on oper channel, use whatever channel-type 971 * is currently in use. 972 */ 973 if (chan == local->_oper_chandef.chan) 974 local->scan_chandef = local->_oper_chandef; 975 else 976 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 977 978 set_channel: 979 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 980 skip = 1; 981 982 /* advance state machine to next channel/band */ 983 local->scan_channel_idx++; 984 985 if (skip) { 986 /* if we skip this channel return to the decision state */ 987 local->next_scan_state = SCAN_DECISION; 988 return; 989 } 990 991 /* 992 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 993 * (which unfortunately doesn't say _why_ step a) is done, 994 * but it waits for the probe delay or until a frame is 995 * received - and the received frame would update the NAV). 996 * For now, we do not support waiting until a frame is 997 * received. 998 * 999 * In any case, it is not necessary for a passive scan. 1000 */ 1001 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 1002 !scan_req->n_ssids) { 1003 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 1004 local->next_scan_state = SCAN_DECISION; 1005 if (scan_req->n_ssids) 1006 set_bit(SCAN_BEACON_WAIT, &local->scanning); 1007 return; 1008 } 1009 1010 /* active scan, send probes */ 1011 *next_delay = IEEE80211_PROBE_DELAY; 1012 local->next_scan_state = SCAN_SEND_PROBE; 1013 } 1014 1015 static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 1016 unsigned long *next_delay) 1017 { 1018 /* switch back to the operating channel */ 1019 local->scan_chandef.chan = NULL; 1020 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 1021 1022 /* disable PS */ 1023 ieee80211_offchannel_return(local); 1024 1025 *next_delay = HZ / 5; 1026 /* afterwards, resume scan & go to next channel */ 1027 local->next_scan_state = SCAN_RESUME; 1028 } 1029 1030 static void ieee80211_scan_state_resume(struct ieee80211_local *local, 1031 unsigned long *next_delay) 1032 { 1033 ieee80211_offchannel_stop_vifs(local); 1034 1035 if (local->ops->flush) { 1036 ieee80211_flush_queues(local, NULL, false); 1037 *next_delay = 0; 1038 } else 1039 *next_delay = HZ / 10; 1040 1041 /* remember when we left the operating channel */ 1042 local->leave_oper_channel_time = jiffies; 1043 1044 /* advance to the next channel to be scanned */ 1045 local->next_scan_state = SCAN_SET_CHANNEL; 1046 } 1047 1048 void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) 1049 { 1050 struct ieee80211_local *local = 1051 container_of(work, struct ieee80211_local, scan_work.work); 1052 struct ieee80211_sub_if_data *sdata; 1053 struct cfg80211_scan_request *scan_req; 1054 unsigned long next_delay = 0; 1055 bool aborted; 1056 1057 lockdep_assert_wiphy(local->hw.wiphy); 1058 1059 if (!ieee80211_can_run_worker(local)) { 1060 aborted = true; 1061 goto out_complete; 1062 } 1063 1064 sdata = rcu_dereference_protected(local->scan_sdata, 1065 lockdep_is_held(&local->hw.wiphy->mtx)); 1066 scan_req = rcu_dereference_protected(local->scan_req, 1067 lockdep_is_held(&local->hw.wiphy->mtx)); 1068 1069 /* When scanning on-channel, the first-callback means completed. */ 1070 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 1071 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1072 goto out_complete; 1073 } 1074 1075 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 1076 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1077 goto out_complete; 1078 } 1079 1080 if (!sdata || !scan_req) 1081 return; 1082 1083 if (!local->scanning) { 1084 int rc; 1085 1086 RCU_INIT_POINTER(local->scan_req, NULL); 1087 RCU_INIT_POINTER(local->scan_sdata, NULL); 1088 1089 rc = __ieee80211_start_scan(sdata, scan_req); 1090 if (!rc) 1091 return; 1092 /* need to complete scan in cfg80211 */ 1093 rcu_assign_pointer(local->scan_req, scan_req); 1094 aborted = true; 1095 goto out_complete; 1096 } 1097 1098 clear_bit(SCAN_BEACON_WAIT, &local->scanning); 1099 1100 /* 1101 * as long as no delay is required advance immediately 1102 * without scheduling a new work 1103 */ 1104 do { 1105 if (!ieee80211_sdata_running(sdata)) { 1106 aborted = true; 1107 goto out_complete; 1108 } 1109 1110 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) && 1111 local->next_scan_state == SCAN_DECISION) 1112 local->next_scan_state = SCAN_SEND_PROBE; 1113 1114 switch (local->next_scan_state) { 1115 case SCAN_DECISION: 1116 /* if no more bands/channels left, complete scan */ 1117 if (local->scan_channel_idx >= scan_req->n_channels) { 1118 aborted = false; 1119 goto out_complete; 1120 } 1121 ieee80211_scan_state_decision(local, &next_delay); 1122 break; 1123 case SCAN_SET_CHANNEL: 1124 ieee80211_scan_state_set_channel(local, &next_delay); 1125 break; 1126 case SCAN_SEND_PROBE: 1127 ieee80211_scan_state_send_probe(local, &next_delay); 1128 break; 1129 case SCAN_SUSPEND: 1130 ieee80211_scan_state_suspend(local, &next_delay); 1131 break; 1132 case SCAN_RESUME: 1133 ieee80211_scan_state_resume(local, &next_delay); 1134 break; 1135 case SCAN_ABORT: 1136 aborted = true; 1137 goto out_complete; 1138 } 1139 } while (next_delay == 0); 1140 1141 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 1142 next_delay); 1143 return; 1144 1145 out_complete: 1146 __ieee80211_scan_completed(&local->hw, aborted); 1147 } 1148 1149 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1150 struct cfg80211_scan_request *req) 1151 { 1152 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1153 1154 return __ieee80211_start_scan(sdata, req); 1155 } 1156 1157 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1158 const u8 *ssid, u8 ssid_len, 1159 struct ieee80211_channel **channels, 1160 unsigned int n_channels) 1161 { 1162 struct ieee80211_local *local = sdata->local; 1163 int ret = -EBUSY, i, n_ch = 0; 1164 enum nl80211_band band; 1165 1166 lockdep_assert_wiphy(local->hw.wiphy); 1167 1168 /* busy scanning */ 1169 if (local->scan_req) 1170 goto unlock; 1171 1172 /* fill internal scan request */ 1173 if (!channels) { 1174 int max_n; 1175 1176 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1177 if (!local->hw.wiphy->bands[band] || 1178 band == NL80211_BAND_6GHZ) 1179 continue; 1180 1181 max_n = local->hw.wiphy->bands[band]->n_channels; 1182 for (i = 0; i < max_n; i++) { 1183 struct ieee80211_channel *tmp_ch = 1184 &local->hw.wiphy->bands[band]->channels[i]; 1185 1186 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1187 IEEE80211_CHAN_DISABLED)) 1188 continue; 1189 1190 local->int_scan_req->channels[n_ch] = tmp_ch; 1191 n_ch++; 1192 } 1193 } 1194 1195 if (WARN_ON_ONCE(n_ch == 0)) 1196 goto unlock; 1197 1198 local->int_scan_req->n_channels = n_ch; 1199 } else { 1200 for (i = 0; i < n_channels; i++) { 1201 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1202 IEEE80211_CHAN_DISABLED)) 1203 continue; 1204 1205 local->int_scan_req->channels[n_ch] = channels[i]; 1206 n_ch++; 1207 } 1208 1209 if (WARN_ON_ONCE(n_ch == 0)) 1210 goto unlock; 1211 1212 local->int_scan_req->n_channels = n_ch; 1213 } 1214 1215 local->int_scan_req->ssids = &local->scan_ssid; 1216 local->int_scan_req->n_ssids = 1; 1217 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1218 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1219 1220 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1221 unlock: 1222 return ret; 1223 } 1224 1225 void ieee80211_scan_cancel(struct ieee80211_local *local) 1226 { 1227 /* ensure a new scan cannot be queued */ 1228 lockdep_assert_wiphy(local->hw.wiphy); 1229 1230 /* 1231 * We are canceling software scan, or deferred scan that was not 1232 * yet really started (see __ieee80211_start_scan ). 1233 * 1234 * Regarding hardware scan: 1235 * - we can not call __ieee80211_scan_completed() as when 1236 * SCAN_HW_SCANNING bit is set this function change 1237 * local->hw_scan_req to operate on 5G band, what race with 1238 * driver which can use local->hw_scan_req 1239 * 1240 * - we can not cancel scan_work since driver can schedule it 1241 * by ieee80211_scan_completed(..., true) to finish scan 1242 * 1243 * Hence we only call the cancel_hw_scan() callback, but the low-level 1244 * driver is still responsible for calling ieee80211_scan_completed() 1245 * after the scan was completed/aborted. 1246 */ 1247 1248 if (!local->scan_req) 1249 return; 1250 1251 /* 1252 * We have a scan running and the driver already reported completion, 1253 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1254 * cancelled. 1255 */ 1256 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1257 test_bit(SCAN_COMPLETED, &local->scanning)) { 1258 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1259 return; 1260 } 1261 1262 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1263 /* 1264 * Make sure that __ieee80211_scan_completed doesn't trigger a 1265 * scan on another band. 1266 */ 1267 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1268 if (local->ops->cancel_hw_scan) 1269 drv_cancel_hw_scan(local, 1270 rcu_dereference_protected(local->scan_sdata, 1271 lockdep_is_held(&local->hw.wiphy->mtx))); 1272 return; 1273 } 1274 1275 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work); 1276 /* and clean up */ 1277 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1278 __ieee80211_scan_completed(&local->hw, true); 1279 } 1280 1281 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1282 struct cfg80211_sched_scan_request *req) 1283 { 1284 struct ieee80211_local *local = sdata->local; 1285 struct ieee80211_scan_ies sched_scan_ies = {}; 1286 struct cfg80211_chan_def chandef; 1287 int ret, i, iebufsz, num_bands = 0; 1288 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1289 u8 bands_used = 0; 1290 u8 *ie; 1291 u32 flags = 0; 1292 1293 lockdep_assert_wiphy(local->hw.wiphy); 1294 1295 iebufsz = local->scan_ies_len + req->ie_len; 1296 1297 if (!local->ops->sched_scan_start) 1298 return -EOPNOTSUPP; 1299 1300 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1301 if (local->hw.wiphy->bands[i]) { 1302 bands_used |= BIT(i); 1303 rate_masks[i] = (u32) -1; 1304 num_bands++; 1305 } 1306 } 1307 1308 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1309 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1310 1311 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1312 if (!ie) { 1313 ret = -ENOMEM; 1314 goto out; 1315 } 1316 1317 ieee80211_prepare_scan_chandef(&chandef); 1318 1319 ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, 1320 &sched_scan_ies, req->ie, 1321 req->ie_len, bands_used, rate_masks, &chandef, 1322 flags); 1323 1324 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1325 if (ret == 0) { 1326 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1327 rcu_assign_pointer(local->sched_scan_req, req); 1328 } 1329 1330 kfree(ie); 1331 1332 out: 1333 if (ret) { 1334 /* Clean in case of failure after HW restart or upon resume. */ 1335 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1336 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1337 } 1338 1339 return ret; 1340 } 1341 1342 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1343 struct cfg80211_sched_scan_request *req) 1344 { 1345 struct ieee80211_local *local = sdata->local; 1346 1347 lockdep_assert_wiphy(local->hw.wiphy); 1348 1349 if (rcu_access_pointer(local->sched_scan_sdata)) 1350 return -EBUSY; 1351 1352 return __ieee80211_request_sched_scan_start(sdata, req); 1353 } 1354 1355 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1356 { 1357 struct ieee80211_sub_if_data *sched_scan_sdata; 1358 int ret = -ENOENT; 1359 1360 lockdep_assert_wiphy(local->hw.wiphy); 1361 1362 if (!local->ops->sched_scan_stop) 1363 return -EOPNOTSUPP; 1364 1365 /* We don't want to restart sched scan anymore. */ 1366 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1367 1368 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1369 lockdep_is_held(&local->hw.wiphy->mtx)); 1370 if (sched_scan_sdata) { 1371 ret = drv_sched_scan_stop(local, sched_scan_sdata); 1372 if (!ret) 1373 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1374 } 1375 1376 return ret; 1377 } 1378 1379 void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1380 { 1381 struct ieee80211_local *local = hw_to_local(hw); 1382 1383 trace_api_sched_scan_results(local); 1384 1385 cfg80211_sched_scan_results(hw->wiphy, 0); 1386 } 1387 EXPORT_SYMBOL(ieee80211_sched_scan_results); 1388 1389 void ieee80211_sched_scan_end(struct ieee80211_local *local) 1390 { 1391 lockdep_assert_wiphy(local->hw.wiphy); 1392 1393 if (!rcu_access_pointer(local->sched_scan_sdata)) 1394 return; 1395 1396 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1397 1398 /* If sched scan was aborted by the driver. */ 1399 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1400 1401 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0); 1402 } 1403 1404 void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, 1405 struct wiphy_work *work) 1406 { 1407 struct ieee80211_local *local = 1408 container_of(work, struct ieee80211_local, 1409 sched_scan_stopped_work); 1410 1411 ieee80211_sched_scan_end(local); 1412 } 1413 1414 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1415 { 1416 struct ieee80211_local *local = hw_to_local(hw); 1417 1418 trace_api_sched_scan_stopped(local); 1419 1420 /* 1421 * this shouldn't really happen, so for simplicity 1422 * simply ignore it, and let mac80211 reconfigure 1423 * the sched scan later on. 1424 */ 1425 if (local->in_reconfig) 1426 return; 1427 1428 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work); 1429 } 1430 EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1431