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 if (ielen < 0) 404 return false; 405 local->hw_scan_req->req.ie_len = ielen; 406 local->hw_scan_req->req.no_cck = req->no_cck; 407 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); 408 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, 409 req->mac_addr_mask); 410 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); 411 412 return true; 413 } 414 415 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 416 { 417 struct ieee80211_local *local = hw_to_local(hw); 418 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 419 bool was_scanning = local->scanning; 420 struct cfg80211_scan_request *scan_req; 421 struct ieee80211_sub_if_data *scan_sdata; 422 struct ieee80211_sub_if_data *sdata; 423 424 lockdep_assert_wiphy(local->hw.wiphy); 425 426 /* 427 * It's ok to abort a not-yet-running scan (that 428 * we have one at all will be verified by checking 429 * local->scan_req next), but not to complete it 430 * successfully. 431 */ 432 if (WARN_ON(!local->scanning && !aborted)) 433 aborted = true; 434 435 if (WARN_ON(!local->scan_req)) 436 return; 437 438 scan_sdata = rcu_dereference_protected(local->scan_sdata, 439 lockdep_is_held(&local->hw.wiphy->mtx)); 440 441 if (hw_scan && !aborted && 442 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && 443 ieee80211_prep_hw_scan(scan_sdata)) { 444 int rc; 445 446 rc = drv_hw_scan(local, 447 rcu_dereference_protected(local->scan_sdata, 448 lockdep_is_held(&local->hw.wiphy->mtx)), 449 local->hw_scan_req); 450 451 if (rc == 0) 452 return; 453 454 /* HW scan failed and is going to be reported as aborted, 455 * so clear old scan info. 456 */ 457 memset(&local->scan_info, 0, sizeof(local->scan_info)); 458 aborted = true; 459 } 460 461 kfree(local->hw_scan_req); 462 local->hw_scan_req = NULL; 463 464 scan_req = rcu_dereference_protected(local->scan_req, 465 lockdep_is_held(&local->hw.wiphy->mtx)); 466 467 RCU_INIT_POINTER(local->scan_req, NULL); 468 RCU_INIT_POINTER(local->scan_sdata, NULL); 469 470 local->scanning = 0; 471 local->scan_chandef.chan = NULL; 472 473 synchronize_rcu(); 474 475 if (scan_req != local->int_scan_req) { 476 local->scan_info.aborted = aborted; 477 cfg80211_scan_done(scan_req, &local->scan_info); 478 } 479 480 /* Set power back to normal operating levels. */ 481 ieee80211_hw_conf_chan(local); 482 483 if (!hw_scan && was_scanning) { 484 ieee80211_configure_filter(local); 485 drv_sw_scan_complete(local, scan_sdata); 486 ieee80211_offchannel_return(local); 487 } 488 489 ieee80211_recalc_idle(local); 490 491 ieee80211_mlme_notify_scan_completed(local); 492 ieee80211_ibss_notify_scan_completed(local); 493 494 /* Requeue all the work that might have been ignored while 495 * the scan was in progress; if there was none this will 496 * just be a no-op for the particular interface. 497 */ 498 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 499 if (ieee80211_sdata_running(sdata)) 500 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 501 } 502 503 if (was_scanning) 504 ieee80211_start_next_roc(local); 505 } 506 507 void ieee80211_scan_completed(struct ieee80211_hw *hw, 508 struct cfg80211_scan_info *info) 509 { 510 struct ieee80211_local *local = hw_to_local(hw); 511 512 trace_api_scan_completed(local, info->aborted); 513 514 set_bit(SCAN_COMPLETED, &local->scanning); 515 if (info->aborted) 516 set_bit(SCAN_ABORTED, &local->scanning); 517 518 memcpy(&local->scan_info, info, sizeof(*info)); 519 520 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 521 } 522 EXPORT_SYMBOL(ieee80211_scan_completed); 523 524 static int ieee80211_start_sw_scan(struct ieee80211_local *local, 525 struct ieee80211_sub_if_data *sdata) 526 { 527 /* Software scan is not supported in multi-channel cases */ 528 if (!local->emulate_chanctx) 529 return -EOPNOTSUPP; 530 531 /* 532 * Hardware/driver doesn't support hw_scan, so use software 533 * scanning instead. First send a nullfunc frame with power save 534 * bit on so that AP will buffer the frames for us while we are not 535 * listening, then send probe requests to each channel and wait for 536 * the responses. After all channels are scanned, tune back to the 537 * original channel and send a nullfunc frame with power save bit 538 * off to trigger the AP to send us all the buffered frames. 539 * 540 * Note that while local->sw_scanning is true everything else but 541 * nullfunc frames and probe requests will be dropped in 542 * ieee80211_tx_h_check_assoc(). 543 */ 544 drv_sw_scan_start(local, sdata, local->scan_addr); 545 546 local->leave_oper_channel_time = jiffies; 547 local->next_scan_state = SCAN_DECISION; 548 local->scan_channel_idx = 0; 549 550 ieee80211_offchannel_stop_vifs(local); 551 552 /* ensure nullfunc is transmitted before leaving operating channel */ 553 ieee80211_flush_queues(local, NULL, false); 554 555 ieee80211_configure_filter(local); 556 557 /* We need to set power level at maximum rate for scanning. */ 558 ieee80211_hw_conf_chan(local); 559 560 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 561 562 return 0; 563 } 564 565 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) 566 { 567 struct ieee80211_local *local = sdata->local; 568 struct ieee80211_sub_if_data *sdata_iter; 569 570 lockdep_assert_wiphy(local->hw.wiphy); 571 572 if (!ieee80211_is_radar_required(local)) 573 return true; 574 575 if (!regulatory_pre_cac_allowed(local->hw.wiphy)) 576 return false; 577 578 list_for_each_entry(sdata_iter, &local->interfaces, list) { 579 if (sdata_iter->wdev.cac_started) 580 return false; 581 } 582 583 return true; 584 } 585 586 static bool ieee80211_can_scan(struct ieee80211_local *local, 587 struct ieee80211_sub_if_data *sdata) 588 { 589 if (!__ieee80211_can_leave_ch(sdata)) 590 return false; 591 592 if (!list_empty(&local->roc_list)) 593 return false; 594 595 if (sdata->vif.type == NL80211_IFTYPE_STATION && 596 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 597 return false; 598 599 return true; 600 } 601 602 void ieee80211_run_deferred_scan(struct ieee80211_local *local) 603 { 604 lockdep_assert_wiphy(local->hw.wiphy); 605 606 if (!local->scan_req || local->scanning) 607 return; 608 609 if (!ieee80211_can_scan(local, 610 rcu_dereference_protected( 611 local->scan_sdata, 612 lockdep_is_held(&local->hw.wiphy->mtx)))) 613 return; 614 615 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 616 round_jiffies_relative(0)); 617 } 618 619 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 620 const u8 *src, const u8 *dst, 621 const u8 *ssid, size_t ssid_len, 622 const u8 *ie, size_t ie_len, 623 u32 ratemask, u32 flags, u32 tx_flags, 624 struct ieee80211_channel *channel) 625 { 626 struct sk_buff *skb; 627 628 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 629 ssid, ssid_len, 630 ie, ie_len, flags); 631 632 if (skb) { 633 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 634 struct ieee80211_hdr *hdr = (void *)skb->data; 635 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 636 u16 sn = get_random_u16(); 637 638 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 639 hdr->seq_ctrl = 640 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 641 } 642 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 643 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); 644 } 645 } 646 647 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 648 unsigned long *next_delay) 649 { 650 int i; 651 struct ieee80211_sub_if_data *sdata; 652 struct cfg80211_scan_request *scan_req; 653 enum nl80211_band band = local->hw.conf.chandef.chan->band; 654 u32 flags = 0, tx_flags; 655 656 scan_req = rcu_dereference_protected(local->scan_req, 657 lockdep_is_held(&local->hw.wiphy->mtx)); 658 659 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 660 if (scan_req->no_cck) 661 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 662 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 663 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 664 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 665 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 666 667 sdata = rcu_dereference_protected(local->scan_sdata, 668 lockdep_is_held(&local->hw.wiphy->mtx)); 669 670 for (i = 0; i < scan_req->n_ssids; i++) 671 ieee80211_send_scan_probe_req( 672 sdata, local->scan_addr, scan_req->bssid, 673 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 674 scan_req->ie, scan_req->ie_len, 675 scan_req->rates[band], flags, 676 tx_flags, local->hw.conf.chandef.chan); 677 678 /* 679 * After sending probe requests, wait for probe responses 680 * on the channel. 681 */ 682 *next_delay = msecs_to_jiffies(scan_req->duration) > 683 IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ? 684 msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY : 685 IEEE80211_CHANNEL_TIME; 686 local->next_scan_state = SCAN_DECISION; 687 } 688 689 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 690 struct cfg80211_scan_request *req) 691 { 692 struct ieee80211_local *local = sdata->local; 693 bool hw_scan = local->ops->hw_scan; 694 int rc; 695 696 lockdep_assert_wiphy(local->hw.wiphy); 697 698 if (local->scan_req) 699 return -EBUSY; 700 701 /* For an MLO connection, if a link ID was specified, validate that it 702 * is indeed active. If no link ID was specified, select one of the 703 * active links. 704 */ 705 if (ieee80211_vif_is_mld(&sdata->vif)) { 706 if (req->tsf_report_link_id >= 0) { 707 if (!(sdata->vif.active_links & 708 BIT(req->tsf_report_link_id))) 709 return -EINVAL; 710 } else { 711 req->tsf_report_link_id = 712 __ffs(sdata->vif.active_links); 713 } 714 } 715 716 if (!__ieee80211_can_leave_ch(sdata)) 717 return -EBUSY; 718 719 if (!ieee80211_can_scan(local, sdata)) { 720 /* wait for the work to finish/time out */ 721 rcu_assign_pointer(local->scan_req, req); 722 rcu_assign_pointer(local->scan_sdata, sdata); 723 return 0; 724 } 725 726 again: 727 if (hw_scan) { 728 u8 *ies; 729 730 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 731 732 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 733 int i, n_bands = 0; 734 u8 bands_counted = 0; 735 736 for (i = 0; i < req->n_channels; i++) { 737 if (bands_counted & BIT(req->channels[i]->band)) 738 continue; 739 bands_counted |= BIT(req->channels[i]->band); 740 n_bands++; 741 } 742 743 local->hw_scan_ies_bufsize *= n_bands; 744 } 745 746 local->hw_scan_req = kmalloc( 747 sizeof(*local->hw_scan_req) + 748 req->n_channels * sizeof(req->channels[0]) + 749 local->hw_scan_ies_bufsize, GFP_KERNEL); 750 if (!local->hw_scan_req) 751 return -ENOMEM; 752 753 local->hw_scan_req->req.ssids = req->ssids; 754 local->hw_scan_req->req.n_ssids = req->n_ssids; 755 ies = (u8 *)local->hw_scan_req + 756 sizeof(*local->hw_scan_req) + 757 req->n_channels * sizeof(req->channels[0]); 758 local->hw_scan_req->req.ie = ies; 759 local->hw_scan_req->req.flags = req->flags; 760 eth_broadcast_addr(local->hw_scan_req->req.bssid); 761 local->hw_scan_req->req.duration = req->duration; 762 local->hw_scan_req->req.duration_mandatory = 763 req->duration_mandatory; 764 local->hw_scan_req->req.tsf_report_link_id = 765 req->tsf_report_link_id; 766 767 local->hw_scan_band = 0; 768 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; 769 local->hw_scan_req->req.scan_6ghz_params = 770 req->scan_6ghz_params; 771 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; 772 773 /* 774 * After allocating local->hw_scan_req, we must 775 * go through until ieee80211_prep_hw_scan(), so 776 * anything that might be changed here and leave 777 * this function early must not go after this 778 * allocation. 779 */ 780 } 781 782 rcu_assign_pointer(local->scan_req, req); 783 rcu_assign_pointer(local->scan_sdata, sdata); 784 785 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 786 get_random_mask_addr(local->scan_addr, 787 req->mac_addr, 788 req->mac_addr_mask); 789 else 790 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 791 792 if (hw_scan) { 793 __set_bit(SCAN_HW_SCANNING, &local->scanning); 794 } else if ((req->n_channels == 1) && 795 (req->channels[0] == local->hw.conf.chandef.chan)) { 796 /* 797 * If we are scanning only on the operating channel 798 * then we do not need to stop normal activities 799 */ 800 unsigned long next_delay; 801 802 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 803 804 ieee80211_recalc_idle(local); 805 806 /* Notify driver scan is starting, keep order of operations 807 * same as normal software scan, in case that matters. */ 808 drv_sw_scan_start(local, sdata, local->scan_addr); 809 810 ieee80211_configure_filter(local); /* accept probe-responses */ 811 812 /* We need to ensure power level is at max for scanning. */ 813 ieee80211_hw_conf_chan(local); 814 815 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 816 IEEE80211_CHAN_RADAR)) || 817 !req->n_ssids) { 818 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 819 if (req->n_ssids) 820 set_bit(SCAN_BEACON_WAIT, &local->scanning); 821 } else { 822 ieee80211_scan_state_send_probe(local, &next_delay); 823 next_delay = IEEE80211_CHANNEL_TIME; 824 } 825 826 /* Now, just wait a bit and we are all done! */ 827 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 828 next_delay); 829 return 0; 830 } else { 831 /* Do normal software scan */ 832 __set_bit(SCAN_SW_SCANNING, &local->scanning); 833 } 834 835 ieee80211_recalc_idle(local); 836 837 if (hw_scan) { 838 WARN_ON(!ieee80211_prep_hw_scan(sdata)); 839 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 840 } else { 841 rc = ieee80211_start_sw_scan(local, sdata); 842 } 843 844 if (rc) { 845 kfree(local->hw_scan_req); 846 local->hw_scan_req = NULL; 847 local->scanning = 0; 848 849 ieee80211_recalc_idle(local); 850 851 local->scan_req = NULL; 852 RCU_INIT_POINTER(local->scan_sdata, NULL); 853 } 854 855 if (hw_scan && rc == 1) { 856 /* 857 * we can't fall back to software for P2P-GO 858 * as it must update NoA etc. 859 */ 860 if (ieee80211_vif_type_p2p(&sdata->vif) == 861 NL80211_IFTYPE_P2P_GO) 862 return -EOPNOTSUPP; 863 hw_scan = false; 864 goto again; 865 } 866 867 return rc; 868 } 869 870 static unsigned long 871 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 872 { 873 /* 874 * TODO: channel switching also consumes quite some time, 875 * add that delay as well to get a better estimation 876 */ 877 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 878 return IEEE80211_PASSIVE_CHANNEL_TIME; 879 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 880 } 881 882 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 883 unsigned long *next_delay) 884 { 885 bool associated = false; 886 bool tx_empty = true; 887 bool bad_latency; 888 struct ieee80211_sub_if_data *sdata; 889 struct ieee80211_channel *next_chan; 890 enum mac80211_scan_state next_scan_state; 891 struct cfg80211_scan_request *scan_req; 892 893 lockdep_assert_wiphy(local->hw.wiphy); 894 895 /* 896 * check if at least one STA interface is associated, 897 * check if at least one STA interface has pending tx frames 898 * and grab the lowest used beacon interval 899 */ 900 list_for_each_entry(sdata, &local->interfaces, list) { 901 if (!ieee80211_sdata_running(sdata)) 902 continue; 903 904 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 905 if (sdata->u.mgd.associated) { 906 associated = true; 907 908 if (!qdisc_all_tx_empty(sdata->dev)) { 909 tx_empty = false; 910 break; 911 } 912 } 913 } 914 } 915 916 scan_req = rcu_dereference_protected(local->scan_req, 917 lockdep_is_held(&local->hw.wiphy->mtx)); 918 919 next_chan = scan_req->channels[local->scan_channel_idx]; 920 921 /* 922 * we're currently scanning a different channel, let's 923 * see if we can scan another channel without interfering 924 * with the current traffic situation. 925 * 926 * Keep good latency, do not stay off-channel more than 125 ms. 927 */ 928 929 bad_latency = time_after(jiffies + 930 ieee80211_scan_get_channel_time(next_chan), 931 local->leave_oper_channel_time + HZ / 8); 932 933 if (associated && !tx_empty) { 934 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 935 next_scan_state = SCAN_ABORT; 936 else 937 next_scan_state = SCAN_SUSPEND; 938 } else if (associated && bad_latency) { 939 next_scan_state = SCAN_SUSPEND; 940 } else { 941 next_scan_state = SCAN_SET_CHANNEL; 942 } 943 944 local->next_scan_state = next_scan_state; 945 946 *next_delay = 0; 947 } 948 949 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 950 unsigned long *next_delay) 951 { 952 int skip; 953 struct ieee80211_channel *chan; 954 struct cfg80211_scan_request *scan_req; 955 956 scan_req = rcu_dereference_protected(local->scan_req, 957 lockdep_is_held(&local->hw.wiphy->mtx)); 958 959 skip = 0; 960 chan = scan_req->channels[local->scan_channel_idx]; 961 962 local->scan_chandef.chan = chan; 963 local->scan_chandef.center_freq1 = chan->center_freq; 964 local->scan_chandef.freq1_offset = chan->freq_offset; 965 local->scan_chandef.center_freq2 = 0; 966 967 /* For scanning on the S1G band, detect the channel width according to 968 * the channel being scanned. 969 */ 970 if (chan->band == NL80211_BAND_S1GHZ) { 971 local->scan_chandef.width = ieee80211_s1g_channel_width(chan); 972 goto set_channel; 973 } 974 975 /* If scanning on oper channel, use whatever channel-type 976 * is currently in use. 977 */ 978 if (chan == local->hw.conf.chandef.chan) 979 local->scan_chandef = local->hw.conf.chandef; 980 else 981 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 982 983 set_channel: 984 if (ieee80211_hw_conf_chan(local)) 985 skip = 1; 986 987 /* advance state machine to next channel/band */ 988 local->scan_channel_idx++; 989 990 if (skip) { 991 /* if we skip this channel return to the decision state */ 992 local->next_scan_state = SCAN_DECISION; 993 return; 994 } 995 996 /* 997 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 998 * (which unfortunately doesn't say _why_ step a) is done, 999 * but it waits for the probe delay or until a frame is 1000 * received - and the received frame would update the NAV). 1001 * For now, we do not support waiting until a frame is 1002 * received. 1003 * 1004 * In any case, it is not necessary for a passive scan. 1005 */ 1006 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 1007 !scan_req->n_ssids) { 1008 *next_delay = msecs_to_jiffies(scan_req->duration) > 1009 IEEE80211_PASSIVE_CHANNEL_TIME ? 1010 msecs_to_jiffies(scan_req->duration) : 1011 IEEE80211_PASSIVE_CHANNEL_TIME; 1012 local->next_scan_state = SCAN_DECISION; 1013 if (scan_req->n_ssids) 1014 set_bit(SCAN_BEACON_WAIT, &local->scanning); 1015 return; 1016 } 1017 1018 /* active scan, send probes */ 1019 *next_delay = IEEE80211_PROBE_DELAY; 1020 local->next_scan_state = SCAN_SEND_PROBE; 1021 } 1022 1023 static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 1024 unsigned long *next_delay) 1025 { 1026 /* switch back to the operating channel */ 1027 local->scan_chandef.chan = NULL; 1028 ieee80211_hw_conf_chan(local); 1029 1030 /* disable PS */ 1031 ieee80211_offchannel_return(local); 1032 1033 *next_delay = HZ / 5; 1034 /* afterwards, resume scan & go to next channel */ 1035 local->next_scan_state = SCAN_RESUME; 1036 } 1037 1038 static void ieee80211_scan_state_resume(struct ieee80211_local *local, 1039 unsigned long *next_delay) 1040 { 1041 ieee80211_offchannel_stop_vifs(local); 1042 1043 if (local->ops->flush) { 1044 ieee80211_flush_queues(local, NULL, false); 1045 *next_delay = 0; 1046 } else 1047 *next_delay = HZ / 10; 1048 1049 /* remember when we left the operating channel */ 1050 local->leave_oper_channel_time = jiffies; 1051 1052 /* advance to the next channel to be scanned */ 1053 local->next_scan_state = SCAN_SET_CHANNEL; 1054 } 1055 1056 void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) 1057 { 1058 struct ieee80211_local *local = 1059 container_of(work, struct ieee80211_local, scan_work.work); 1060 struct ieee80211_sub_if_data *sdata; 1061 struct cfg80211_scan_request *scan_req; 1062 unsigned long next_delay = 0; 1063 bool aborted; 1064 1065 lockdep_assert_wiphy(local->hw.wiphy); 1066 1067 if (!ieee80211_can_run_worker(local)) { 1068 aborted = true; 1069 goto out_complete; 1070 } 1071 1072 sdata = rcu_dereference_protected(local->scan_sdata, 1073 lockdep_is_held(&local->hw.wiphy->mtx)); 1074 scan_req = rcu_dereference_protected(local->scan_req, 1075 lockdep_is_held(&local->hw.wiphy->mtx)); 1076 1077 /* When scanning on-channel, the first-callback means completed. */ 1078 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 1079 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1080 goto out_complete; 1081 } 1082 1083 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 1084 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1085 goto out_complete; 1086 } 1087 1088 if (!sdata || !scan_req) 1089 return; 1090 1091 if (!local->scanning) { 1092 int rc; 1093 1094 RCU_INIT_POINTER(local->scan_req, NULL); 1095 RCU_INIT_POINTER(local->scan_sdata, NULL); 1096 1097 rc = __ieee80211_start_scan(sdata, scan_req); 1098 if (!rc) 1099 return; 1100 /* need to complete scan in cfg80211 */ 1101 rcu_assign_pointer(local->scan_req, scan_req); 1102 aborted = true; 1103 goto out_complete; 1104 } 1105 1106 clear_bit(SCAN_BEACON_WAIT, &local->scanning); 1107 1108 /* 1109 * as long as no delay is required advance immediately 1110 * without scheduling a new work 1111 */ 1112 do { 1113 if (!ieee80211_sdata_running(sdata)) { 1114 aborted = true; 1115 goto out_complete; 1116 } 1117 1118 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) && 1119 local->next_scan_state == SCAN_DECISION) 1120 local->next_scan_state = SCAN_SEND_PROBE; 1121 1122 switch (local->next_scan_state) { 1123 case SCAN_DECISION: 1124 /* if no more bands/channels left, complete scan */ 1125 if (local->scan_channel_idx >= scan_req->n_channels) { 1126 aborted = false; 1127 goto out_complete; 1128 } 1129 ieee80211_scan_state_decision(local, &next_delay); 1130 break; 1131 case SCAN_SET_CHANNEL: 1132 ieee80211_scan_state_set_channel(local, &next_delay); 1133 break; 1134 case SCAN_SEND_PROBE: 1135 ieee80211_scan_state_send_probe(local, &next_delay); 1136 break; 1137 case SCAN_SUSPEND: 1138 ieee80211_scan_state_suspend(local, &next_delay); 1139 break; 1140 case SCAN_RESUME: 1141 ieee80211_scan_state_resume(local, &next_delay); 1142 break; 1143 case SCAN_ABORT: 1144 aborted = true; 1145 goto out_complete; 1146 } 1147 } while (next_delay == 0); 1148 1149 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 1150 next_delay); 1151 return; 1152 1153 out_complete: 1154 __ieee80211_scan_completed(&local->hw, aborted); 1155 } 1156 1157 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1158 struct cfg80211_scan_request *req) 1159 { 1160 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1161 1162 return __ieee80211_start_scan(sdata, req); 1163 } 1164 1165 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1166 const u8 *ssid, u8 ssid_len, 1167 struct ieee80211_channel **channels, 1168 unsigned int n_channels) 1169 { 1170 struct ieee80211_local *local = sdata->local; 1171 int ret = -EBUSY, i, n_ch = 0; 1172 enum nl80211_band band; 1173 1174 lockdep_assert_wiphy(local->hw.wiphy); 1175 1176 /* busy scanning */ 1177 if (local->scan_req) 1178 goto unlock; 1179 1180 /* fill internal scan request */ 1181 if (!channels) { 1182 int max_n; 1183 1184 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1185 if (!local->hw.wiphy->bands[band] || 1186 band == NL80211_BAND_6GHZ) 1187 continue; 1188 1189 max_n = local->hw.wiphy->bands[band]->n_channels; 1190 for (i = 0; i < max_n; i++) { 1191 struct ieee80211_channel *tmp_ch = 1192 &local->hw.wiphy->bands[band]->channels[i]; 1193 1194 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1195 IEEE80211_CHAN_DISABLED)) 1196 continue; 1197 1198 local->int_scan_req->channels[n_ch] = tmp_ch; 1199 n_ch++; 1200 } 1201 } 1202 1203 if (WARN_ON_ONCE(n_ch == 0)) 1204 goto unlock; 1205 1206 local->int_scan_req->n_channels = n_ch; 1207 } else { 1208 for (i = 0; i < n_channels; i++) { 1209 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1210 IEEE80211_CHAN_DISABLED)) 1211 continue; 1212 1213 local->int_scan_req->channels[n_ch] = channels[i]; 1214 n_ch++; 1215 } 1216 1217 if (WARN_ON_ONCE(n_ch == 0)) 1218 goto unlock; 1219 1220 local->int_scan_req->n_channels = n_ch; 1221 } 1222 1223 local->int_scan_req->ssids = &local->scan_ssid; 1224 local->int_scan_req->n_ssids = 1; 1225 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1226 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1227 1228 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1229 unlock: 1230 return ret; 1231 } 1232 1233 void ieee80211_scan_cancel(struct ieee80211_local *local) 1234 { 1235 /* ensure a new scan cannot be queued */ 1236 lockdep_assert_wiphy(local->hw.wiphy); 1237 1238 /* 1239 * We are canceling software scan, or deferred scan that was not 1240 * yet really started (see __ieee80211_start_scan ). 1241 * 1242 * Regarding hardware scan: 1243 * - we can not call __ieee80211_scan_completed() as when 1244 * SCAN_HW_SCANNING bit is set this function change 1245 * local->hw_scan_req to operate on 5G band, what race with 1246 * driver which can use local->hw_scan_req 1247 * 1248 * - we can not cancel scan_work since driver can schedule it 1249 * by ieee80211_scan_completed(..., true) to finish scan 1250 * 1251 * Hence we only call the cancel_hw_scan() callback, but the low-level 1252 * driver is still responsible for calling ieee80211_scan_completed() 1253 * after the scan was completed/aborted. 1254 */ 1255 1256 if (!local->scan_req) 1257 return; 1258 1259 /* 1260 * We have a scan running and the driver already reported completion, 1261 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1262 * cancelled. 1263 */ 1264 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1265 test_bit(SCAN_COMPLETED, &local->scanning)) { 1266 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1267 return; 1268 } 1269 1270 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1271 /* 1272 * Make sure that __ieee80211_scan_completed doesn't trigger a 1273 * scan on another band. 1274 */ 1275 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1276 if (local->ops->cancel_hw_scan) 1277 drv_cancel_hw_scan(local, 1278 rcu_dereference_protected(local->scan_sdata, 1279 lockdep_is_held(&local->hw.wiphy->mtx))); 1280 return; 1281 } 1282 1283 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work); 1284 /* and clean up */ 1285 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1286 __ieee80211_scan_completed(&local->hw, true); 1287 } 1288 1289 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1290 struct cfg80211_sched_scan_request *req) 1291 { 1292 struct ieee80211_local *local = sdata->local; 1293 struct ieee80211_scan_ies sched_scan_ies = {}; 1294 struct cfg80211_chan_def chandef; 1295 int ret, i, iebufsz, num_bands = 0; 1296 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1297 u8 bands_used = 0; 1298 u8 *ie; 1299 u32 flags = 0; 1300 1301 lockdep_assert_wiphy(local->hw.wiphy); 1302 1303 iebufsz = local->scan_ies_len + req->ie_len; 1304 1305 if (!local->ops->sched_scan_start) 1306 return -EOPNOTSUPP; 1307 1308 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1309 if (local->hw.wiphy->bands[i]) { 1310 bands_used |= BIT(i); 1311 rate_masks[i] = (u32) -1; 1312 num_bands++; 1313 } 1314 } 1315 1316 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1317 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1318 1319 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1320 if (!ie) { 1321 ret = -ENOMEM; 1322 goto out; 1323 } 1324 1325 ieee80211_prepare_scan_chandef(&chandef); 1326 1327 ret = ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, 1328 &sched_scan_ies, req->ie, 1329 req->ie_len, bands_used, rate_masks, 1330 &chandef, flags); 1331 if (ret < 0) 1332 goto error; 1333 1334 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1335 if (ret == 0) { 1336 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1337 rcu_assign_pointer(local->sched_scan_req, req); 1338 } 1339 1340 error: 1341 kfree(ie); 1342 out: 1343 if (ret) { 1344 /* Clean in case of failure after HW restart or upon resume. */ 1345 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1346 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1347 } 1348 1349 return ret; 1350 } 1351 1352 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1353 struct cfg80211_sched_scan_request *req) 1354 { 1355 struct ieee80211_local *local = sdata->local; 1356 1357 lockdep_assert_wiphy(local->hw.wiphy); 1358 1359 if (rcu_access_pointer(local->sched_scan_sdata)) 1360 return -EBUSY; 1361 1362 return __ieee80211_request_sched_scan_start(sdata, req); 1363 } 1364 1365 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1366 { 1367 struct ieee80211_sub_if_data *sched_scan_sdata; 1368 int ret = -ENOENT; 1369 1370 lockdep_assert_wiphy(local->hw.wiphy); 1371 1372 if (!local->ops->sched_scan_stop) 1373 return -EOPNOTSUPP; 1374 1375 /* We don't want to restart sched scan anymore. */ 1376 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1377 1378 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1379 lockdep_is_held(&local->hw.wiphy->mtx)); 1380 if (sched_scan_sdata) { 1381 ret = drv_sched_scan_stop(local, sched_scan_sdata); 1382 if (!ret) 1383 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1384 } 1385 1386 return ret; 1387 } 1388 1389 void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1390 { 1391 struct ieee80211_local *local = hw_to_local(hw); 1392 1393 trace_api_sched_scan_results(local); 1394 1395 cfg80211_sched_scan_results(hw->wiphy, 0); 1396 } 1397 EXPORT_SYMBOL(ieee80211_sched_scan_results); 1398 1399 void ieee80211_sched_scan_end(struct ieee80211_local *local) 1400 { 1401 lockdep_assert_wiphy(local->hw.wiphy); 1402 1403 if (!rcu_access_pointer(local->sched_scan_sdata)) 1404 return; 1405 1406 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1407 1408 /* If sched scan was aborted by the driver. */ 1409 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1410 1411 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0); 1412 } 1413 1414 void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, 1415 struct wiphy_work *work) 1416 { 1417 struct ieee80211_local *local = 1418 container_of(work, struct ieee80211_local, 1419 sched_scan_stopped_work); 1420 1421 ieee80211_sched_scan_end(local); 1422 } 1423 1424 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1425 { 1426 struct ieee80211_local *local = hw_to_local(hw); 1427 1428 trace_api_sched_scan_stopped(local); 1429 1430 /* 1431 * this shouldn't really happen, so for simplicity 1432 * simply ignore it, and let mac80211 reconfigure 1433 * the sched scan later on. 1434 */ 1435 if (local->in_reconfig) 1436 return; 1437 1438 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work); 1439 } 1440 EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1441