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 32void 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 41static 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 58struct inform_bss_update_data { 59 struct ieee80211_rx_status *rx_status; 60 bool beacon; 61}; 62 63void 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 163struct ieee80211_bss * 164ieee80211_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 239static 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 257void 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_mgmt *mgmt = (void *)skb->data; 261 struct ieee80211_bss *bss; 262 struct ieee80211_channel *channel; 263 size_t min_hdr_len = offsetof(struct ieee80211_mgmt, 264 u.probe_resp.variable); 265 266 if (!ieee80211_is_probe_resp(mgmt->frame_control) && 267 !ieee80211_is_beacon(mgmt->frame_control) && 268 !ieee80211_is_s1g_beacon(mgmt->frame_control)) 269 return; 270 271 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { 272 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) 273 min_hdr_len = offsetof(struct ieee80211_ext, 274 u.s1g_short_beacon.variable); 275 else 276 min_hdr_len = offsetof(struct ieee80211_ext, 277 u.s1g_beacon); 278 } 279 280 if (skb->len < min_hdr_len) 281 return; 282 283 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) { 284 /* 285 * we were passive scanning because of radar/no-IR, but 286 * the beacon/proberesp rx gives us an opportunity to upgrade 287 * to active scan 288 */ 289 set_bit(SCAN_BEACON_DONE, &local->scanning); 290 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 291 } 292 293 channel = ieee80211_get_channel_khz(local->hw.wiphy, 294 ieee80211_rx_status_to_khz(rx_status)); 295 296 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 297 return; 298 299 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 300 struct ieee80211_sub_if_data *sdata1, *sdata2; 301 struct cfg80211_scan_request *scan_req; 302 struct cfg80211_sched_scan_request *sched_scan_req; 303 u32 scan_req_flags = 0, sched_scan_req_flags = 0; 304 305 sdata1 = rcu_dereference(local->scan_sdata); 306 sdata2 = rcu_dereference(local->sched_scan_sdata); 307 308 if (likely(!sdata1 && !sdata2)) 309 return; 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 } else { 331 /* Beacons are expected only with broadcast address */ 332 if (!is_broadcast_ether_addr(mgmt->da)) 333 return; 334 } 335 336 /* Do not update the BSS table in case of only monitor interfaces */ 337 if (local->open_count == local->monitors) 338 return; 339 340 bss = ieee80211_bss_info_update(local, rx_status, 341 mgmt, skb->len, 342 channel); 343 if (bss) 344 ieee80211_rx_bss_put(local, bss); 345} 346 347static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef) 348{ 349 memset(chandef, 0, sizeof(*chandef)); 350 351 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 352} 353 354/* return false if no more work */ 355static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) 356{ 357 struct ieee80211_local *local = sdata->local; 358 struct cfg80211_scan_request *req; 359 struct cfg80211_chan_def chandef; 360 u8 bands_used = 0; 361 int i, ielen, n_chans; 362 u32 flags = 0; 363 364 req = rcu_dereference_protected(local->scan_req, 365 lockdep_is_held(&local->hw.wiphy->mtx)); 366 367 if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) 368 return false; 369 370 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 371 for (i = 0; i < req->n_channels; i++) { 372 local->hw_scan_req->req.channels[i] = req->channels[i]; 373 bands_used |= BIT(req->channels[i]->band); 374 } 375 376 n_chans = req->n_channels; 377 } else { 378 do { 379 if (local->hw_scan_band == NUM_NL80211_BANDS) 380 return false; 381 382 n_chans = 0; 383 384 for (i = 0; i < req->n_channels; i++) { 385 if (req->channels[i]->band != 386 local->hw_scan_band) 387 continue; 388 local->hw_scan_req->req.channels[n_chans] = 389 req->channels[i]; 390 n_chans++; 391 bands_used |= BIT(req->channels[i]->band); 392 } 393 394 local->hw_scan_band++; 395 } while (!n_chans); 396 } 397 398 local->hw_scan_req->req.n_channels = n_chans; 399 ieee80211_prepare_scan_chandef(&chandef); 400 401 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 402 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 403 404 ielen = ieee80211_build_preq_ies(sdata, 405 (u8 *)local->hw_scan_req->req.ie, 406 local->hw_scan_ies_bufsize, 407 &local->hw_scan_req->ies, 408 req->ie, req->ie_len, 409 bands_used, req->rates, &chandef, 410 flags); 411 if (ielen < 0) 412 return false; 413 local->hw_scan_req->req.ie_len = ielen; 414 local->hw_scan_req->req.no_cck = req->no_cck; 415 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); 416 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, 417 req->mac_addr_mask); 418 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); 419 420 return true; 421} 422 423static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 424{ 425 struct ieee80211_local *local = hw_to_local(hw); 426 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 427 bool was_scanning = local->scanning; 428 struct cfg80211_scan_request *scan_req; 429 struct ieee80211_sub_if_data *scan_sdata; 430 struct ieee80211_sub_if_data *sdata; 431 432 lockdep_assert_wiphy(local->hw.wiphy); 433 434 /* 435 * It's ok to abort a not-yet-running scan (that 436 * we have one at all will be verified by checking 437 * local->scan_req next), but not to complete it 438 * successfully. 439 */ 440 if (WARN_ON(!local->scanning && !aborted)) 441 aborted = true; 442 443 if (WARN_ON(!local->scan_req)) 444 return; 445 446 scan_sdata = rcu_dereference_protected(local->scan_sdata, 447 lockdep_is_held(&local->hw.wiphy->mtx)); 448 449 if (hw_scan && !aborted && 450 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && 451 ieee80211_prep_hw_scan(scan_sdata)) { 452 int rc; 453 454 rc = drv_hw_scan(local, 455 rcu_dereference_protected(local->scan_sdata, 456 lockdep_is_held(&local->hw.wiphy->mtx)), 457 local->hw_scan_req); 458 459 if (rc == 0) 460 return; 461 462 /* HW scan failed and is going to be reported as aborted, 463 * so clear old scan info. 464 */ 465 memset(&local->scan_info, 0, sizeof(local->scan_info)); 466 aborted = true; 467 } 468 469 kfree(local->hw_scan_req); 470 local->hw_scan_req = NULL; 471 472 scan_req = rcu_dereference_protected(local->scan_req, 473 lockdep_is_held(&local->hw.wiphy->mtx)); 474 475 RCU_INIT_POINTER(local->scan_req, NULL); 476 RCU_INIT_POINTER(local->scan_sdata, NULL); 477 478 local->scanning = 0; 479 local->scan_chandef.chan = NULL; 480 481 synchronize_rcu(); 482 483 if (scan_req != local->int_scan_req) { 484 local->scan_info.aborted = aborted; 485 cfg80211_scan_done(scan_req, &local->scan_info); 486 } 487 488 /* Set power back to normal operating levels. */ 489 ieee80211_hw_conf_chan(local); 490 491 if (!hw_scan && was_scanning) { 492 ieee80211_configure_filter(local); 493 drv_sw_scan_complete(local, scan_sdata); 494 ieee80211_offchannel_return(local); 495 } 496 497 ieee80211_recalc_idle(local); 498 499 ieee80211_mlme_notify_scan_completed(local); 500 ieee80211_ibss_notify_scan_completed(local); 501 502 /* Requeue all the work that might have been ignored while 503 * the scan was in progress; if there was none this will 504 * just be a no-op for the particular interface. 505 */ 506 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 507 if (ieee80211_sdata_running(sdata)) 508 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 509 } 510 511 if (was_scanning) 512 ieee80211_start_next_roc(local); 513} 514 515void ieee80211_scan_completed(struct ieee80211_hw *hw, 516 struct cfg80211_scan_info *info) 517{ 518 struct ieee80211_local *local = hw_to_local(hw); 519 520 trace_api_scan_completed(local, info->aborted); 521 522 set_bit(SCAN_COMPLETED, &local->scanning); 523 if (info->aborted) 524 set_bit(SCAN_ABORTED, &local->scanning); 525 526 memcpy(&local->scan_info, info, sizeof(*info)); 527 528 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 529} 530EXPORT_SYMBOL(ieee80211_scan_completed); 531 532static int ieee80211_start_sw_scan(struct ieee80211_local *local, 533 struct ieee80211_sub_if_data *sdata) 534{ 535 /* Software scan is not supported in multi-channel cases */ 536 if (!local->emulate_chanctx) 537 return -EOPNOTSUPP; 538 539 /* 540 * Hardware/driver doesn't support hw_scan, so use software 541 * scanning instead. First send a nullfunc frame with power save 542 * bit on so that AP will buffer the frames for us while we are not 543 * listening, then send probe requests to each channel and wait for 544 * the responses. After all channels are scanned, tune back to the 545 * original channel and send a nullfunc frame with power save bit 546 * off to trigger the AP to send us all the buffered frames. 547 * 548 * Note that while local->sw_scanning is true everything else but 549 * nullfunc frames and probe requests will be dropped in 550 * ieee80211_tx_h_check_assoc(). 551 */ 552 drv_sw_scan_start(local, sdata, local->scan_addr); 553 554 local->leave_oper_channel_time = jiffies; 555 local->next_scan_state = SCAN_DECISION; 556 local->scan_channel_idx = 0; 557 558 ieee80211_offchannel_stop_vifs(local); 559 560 /* ensure nullfunc is transmitted before leaving operating channel */ 561 ieee80211_flush_queues(local, NULL, false); 562 563 ieee80211_configure_filter(local); 564 565 /* We need to set power level at maximum rate for scanning. */ 566 ieee80211_hw_conf_chan(local); 567 568 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 569 570 return 0; 571} 572 573static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) 574{ 575 struct ieee80211_local *local = sdata->local; 576 struct ieee80211_sub_if_data *sdata_iter; 577 578 lockdep_assert_wiphy(local->hw.wiphy); 579 580 if (!ieee80211_is_radar_required(local)) 581 return true; 582 583 if (!regulatory_pre_cac_allowed(local->hw.wiphy)) 584 return false; 585 586 list_for_each_entry(sdata_iter, &local->interfaces, list) { 587 if (sdata_iter->wdev.cac_started) 588 return false; 589 } 590 591 return true; 592} 593 594static bool ieee80211_can_scan(struct ieee80211_local *local, 595 struct ieee80211_sub_if_data *sdata) 596{ 597 if (!__ieee80211_can_leave_ch(sdata)) 598 return false; 599 600 if (!list_empty(&local->roc_list)) 601 return false; 602 603 if (sdata->vif.type == NL80211_IFTYPE_STATION && 604 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 605 return false; 606 607 return true; 608} 609 610void ieee80211_run_deferred_scan(struct ieee80211_local *local) 611{ 612 lockdep_assert_wiphy(local->hw.wiphy); 613 614 if (!local->scan_req || local->scanning) 615 return; 616 617 if (!ieee80211_can_scan(local, 618 rcu_dereference_protected( 619 local->scan_sdata, 620 lockdep_is_held(&local->hw.wiphy->mtx)))) 621 return; 622 623 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 624 round_jiffies_relative(0)); 625} 626 627static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 628 const u8 *src, const u8 *dst, 629 const u8 *ssid, size_t ssid_len, 630 const u8 *ie, size_t ie_len, 631 u32 ratemask, u32 flags, u32 tx_flags, 632 struct ieee80211_channel *channel) 633{ 634 struct sk_buff *skb; 635 636 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 637 ssid, ssid_len, 638 ie, ie_len, flags); 639 640 if (skb) { 641 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 642 struct ieee80211_hdr *hdr = (void *)skb->data; 643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 644 u16 sn = get_random_u16(); 645 646 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 647 hdr->seq_ctrl = 648 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 649 } 650 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 651 IEEE80211_SKB_CB(skb)->control.flags |= IEEE80211_TX_CTRL_SCAN_TX; 652 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); 653 } 654} 655 656static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 657 unsigned long *next_delay) 658{ 659 int i; 660 struct ieee80211_sub_if_data *sdata; 661 struct cfg80211_scan_request *scan_req; 662 enum nl80211_band band = local->hw.conf.chandef.chan->band; 663 u32 flags = 0, tx_flags; 664 665 scan_req = rcu_dereference_protected(local->scan_req, 666 lockdep_is_held(&local->hw.wiphy->mtx)); 667 668 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 669 if (scan_req->no_cck) 670 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 671 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 672 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 673 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 674 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 675 676 sdata = rcu_dereference_protected(local->scan_sdata, 677 lockdep_is_held(&local->hw.wiphy->mtx)); 678 679 for (i = 0; i < scan_req->n_ssids; i++) 680 ieee80211_send_scan_probe_req( 681 sdata, local->scan_addr, scan_req->bssid, 682 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 683 scan_req->ie, scan_req->ie_len, 684 scan_req->rates[band], flags, 685 tx_flags, local->hw.conf.chandef.chan); 686 687 /* 688 * After sending probe requests, wait for probe responses 689 * on the channel. 690 */ 691 *next_delay = msecs_to_jiffies(scan_req->duration) > 692 IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ? 693 msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY : 694 IEEE80211_CHANNEL_TIME; 695 local->next_scan_state = SCAN_DECISION; 696} 697 698static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 699 struct cfg80211_scan_request *req) 700{ 701 struct ieee80211_local *local = sdata->local; 702 bool hw_scan = local->ops->hw_scan; 703 int rc; 704 705 lockdep_assert_wiphy(local->hw.wiphy); 706 707 if (local->scan_req) 708 return -EBUSY; 709 710 /* For an MLO connection, if a link ID was specified, validate that it 711 * is indeed active. If no link ID was specified, select one of the 712 * active links. 713 */ 714 if (ieee80211_vif_is_mld(&sdata->vif)) { 715 if (req->tsf_report_link_id >= 0) { 716 if (!(sdata->vif.active_links & 717 BIT(req->tsf_report_link_id))) 718 return -EINVAL; 719 } else { 720 req->tsf_report_link_id = 721 __ffs(sdata->vif.active_links); 722 } 723 } 724 725 if (!__ieee80211_can_leave_ch(sdata)) 726 return -EBUSY; 727 728 if (!ieee80211_can_scan(local, sdata)) { 729 /* wait for the work to finish/time out */ 730 rcu_assign_pointer(local->scan_req, req); 731 rcu_assign_pointer(local->scan_sdata, sdata); 732 return 0; 733 } 734 735 again: 736 if (hw_scan) { 737 u8 *ies; 738 739 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 740 741 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 742 int i, n_bands = 0; 743 u8 bands_counted = 0; 744 745 for (i = 0; i < req->n_channels; i++) { 746 if (bands_counted & BIT(req->channels[i]->band)) 747 continue; 748 bands_counted |= BIT(req->channels[i]->band); 749 n_bands++; 750 } 751 752 local->hw_scan_ies_bufsize *= n_bands; 753 } 754 755 local->hw_scan_req = kmalloc( 756 sizeof(*local->hw_scan_req) + 757 req->n_channels * sizeof(req->channels[0]) + 758 local->hw_scan_ies_bufsize, GFP_KERNEL); 759 if (!local->hw_scan_req) 760 return -ENOMEM; 761 762 local->hw_scan_req->req.ssids = req->ssids; 763 local->hw_scan_req->req.n_ssids = req->n_ssids; 764 ies = (u8 *)local->hw_scan_req + 765 sizeof(*local->hw_scan_req) + 766 req->n_channels * sizeof(req->channels[0]); 767 local->hw_scan_req->req.ie = ies; 768 local->hw_scan_req->req.flags = req->flags; 769 eth_broadcast_addr(local->hw_scan_req->req.bssid); 770 local->hw_scan_req->req.duration = req->duration; 771 local->hw_scan_req->req.duration_mandatory = 772 req->duration_mandatory; 773 local->hw_scan_req->req.tsf_report_link_id = 774 req->tsf_report_link_id; 775 776 local->hw_scan_band = 0; 777 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; 778 local->hw_scan_req->req.scan_6ghz_params = 779 req->scan_6ghz_params; 780 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; 781 782 /* 783 * After allocating local->hw_scan_req, we must 784 * go through until ieee80211_prep_hw_scan(), so 785 * anything that might be changed here and leave 786 * this function early must not go after this 787 * allocation. 788 */ 789 } 790 791 rcu_assign_pointer(local->scan_req, req); 792 rcu_assign_pointer(local->scan_sdata, sdata); 793 794 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 795 get_random_mask_addr(local->scan_addr, 796 req->mac_addr, 797 req->mac_addr_mask); 798 else 799 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 800 801 if (hw_scan) { 802 __set_bit(SCAN_HW_SCANNING, &local->scanning); 803 } else if ((req->n_channels == 1) && 804 (req->channels[0] == local->hw.conf.chandef.chan)) { 805 /* 806 * If we are scanning only on the operating channel 807 * then we do not need to stop normal activities 808 */ 809 unsigned long next_delay; 810 811 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 812 813 ieee80211_recalc_idle(local); 814 815 /* Notify driver scan is starting, keep order of operations 816 * same as normal software scan, in case that matters. */ 817 drv_sw_scan_start(local, sdata, local->scan_addr); 818 819 ieee80211_configure_filter(local); /* accept probe-responses */ 820 821 /* We need to ensure power level is at max for scanning. */ 822 ieee80211_hw_conf_chan(local); 823 824 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 825 IEEE80211_CHAN_RADAR)) || 826 !req->n_ssids) { 827 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 828 if (req->n_ssids) 829 set_bit(SCAN_BEACON_WAIT, &local->scanning); 830 } else { 831 ieee80211_scan_state_send_probe(local, &next_delay); 832 next_delay = IEEE80211_CHANNEL_TIME; 833 } 834 835 /* Now, just wait a bit and we are all done! */ 836 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 837 next_delay); 838 return 0; 839 } else { 840 /* Do normal software scan */ 841 __set_bit(SCAN_SW_SCANNING, &local->scanning); 842 } 843 844 ieee80211_recalc_idle(local); 845 846 if (hw_scan) { 847 WARN_ON(!ieee80211_prep_hw_scan(sdata)); 848 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 849 } else { 850 rc = ieee80211_start_sw_scan(local, sdata); 851 } 852 853 if (rc) { 854 kfree(local->hw_scan_req); 855 local->hw_scan_req = NULL; 856 local->scanning = 0; 857 858 ieee80211_recalc_idle(local); 859 860 local->scan_req = NULL; 861 RCU_INIT_POINTER(local->scan_sdata, NULL); 862 } 863 864 if (hw_scan && rc == 1) { 865 /* 866 * we can't fall back to software for P2P-GO 867 * as it must update NoA etc. 868 */ 869 if (ieee80211_vif_type_p2p(&sdata->vif) == 870 NL80211_IFTYPE_P2P_GO) 871 return -EOPNOTSUPP; 872 hw_scan = false; 873 goto again; 874 } 875 876 return rc; 877} 878 879static unsigned long 880ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 881{ 882 /* 883 * TODO: channel switching also consumes quite some time, 884 * add that delay as well to get a better estimation 885 */ 886 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 887 return IEEE80211_PASSIVE_CHANNEL_TIME; 888 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 889} 890 891static void ieee80211_scan_state_decision(struct ieee80211_local *local, 892 unsigned long *next_delay) 893{ 894 bool associated = false; 895 bool tx_empty = true; 896 bool bad_latency; 897 struct ieee80211_sub_if_data *sdata; 898 struct ieee80211_channel *next_chan; 899 enum mac80211_scan_state next_scan_state; 900 struct cfg80211_scan_request *scan_req; 901 902 lockdep_assert_wiphy(local->hw.wiphy); 903 904 /* 905 * check if at least one STA interface is associated, 906 * check if at least one STA interface has pending tx frames 907 * and grab the lowest used beacon interval 908 */ 909 list_for_each_entry(sdata, &local->interfaces, list) { 910 if (!ieee80211_sdata_running(sdata)) 911 continue; 912 913 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 914 if (sdata->u.mgd.associated) { 915 associated = true; 916 917 if (!qdisc_all_tx_empty(sdata->dev)) { 918 tx_empty = false; 919 break; 920 } 921 } 922 } 923 } 924 925 scan_req = rcu_dereference_protected(local->scan_req, 926 lockdep_is_held(&local->hw.wiphy->mtx)); 927 928 next_chan = scan_req->channels[local->scan_channel_idx]; 929 930 /* 931 * we're currently scanning a different channel, let's 932 * see if we can scan another channel without interfering 933 * with the current traffic situation. 934 * 935 * Keep good latency, do not stay off-channel more than 125 ms. 936 */ 937 938 bad_latency = time_after(jiffies + 939 ieee80211_scan_get_channel_time(next_chan), 940 local->leave_oper_channel_time + HZ / 8); 941 942 if (associated && !tx_empty) { 943 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 944 next_scan_state = SCAN_ABORT; 945 else 946 next_scan_state = SCAN_SUSPEND; 947 } else if (associated && bad_latency) { 948 next_scan_state = SCAN_SUSPEND; 949 } else { 950 next_scan_state = SCAN_SET_CHANNEL; 951 } 952 953 local->next_scan_state = next_scan_state; 954 955 *next_delay = 0; 956} 957 958static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 959 unsigned long *next_delay) 960{ 961 int skip; 962 struct ieee80211_channel *chan; 963 struct cfg80211_scan_request *scan_req; 964 965 scan_req = rcu_dereference_protected(local->scan_req, 966 lockdep_is_held(&local->hw.wiphy->mtx)); 967 968 skip = 0; 969 chan = scan_req->channels[local->scan_channel_idx]; 970 971 local->scan_chandef.chan = chan; 972 local->scan_chandef.center_freq1 = chan->center_freq; 973 local->scan_chandef.freq1_offset = chan->freq_offset; 974 local->scan_chandef.center_freq2 = 0; 975 976 /* For scanning on the S1G band, detect the channel width according to 977 * the channel being scanned. 978 */ 979 if (chan->band == NL80211_BAND_S1GHZ) { 980 local->scan_chandef.width = ieee80211_s1g_channel_width(chan); 981 goto set_channel; 982 } 983 984 /* If scanning on oper channel, use whatever channel-type 985 * is currently in use. 986 */ 987 if (chan == local->hw.conf.chandef.chan) 988 local->scan_chandef = local->hw.conf.chandef; 989 else 990 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 991 992set_channel: 993 if (ieee80211_hw_conf_chan(local)) 994 skip = 1; 995 996 /* advance state machine to next channel/band */ 997 local->scan_channel_idx++; 998 999 if (skip) { 1000 /* if we skip this channel return to the decision state */ 1001 local->next_scan_state = SCAN_DECISION; 1002 return; 1003 } 1004 1005 /* 1006 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 1007 * (which unfortunately doesn't say _why_ step a) is done, 1008 * but it waits for the probe delay or until a frame is 1009 * received - and the received frame would update the NAV). 1010 * For now, we do not support waiting until a frame is 1011 * received. 1012 * 1013 * In any case, it is not necessary for a passive scan. 1014 */ 1015 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 1016 !scan_req->n_ssids) { 1017 *next_delay = msecs_to_jiffies(scan_req->duration) > 1018 IEEE80211_PASSIVE_CHANNEL_TIME ? 1019 msecs_to_jiffies(scan_req->duration) : 1020 IEEE80211_PASSIVE_CHANNEL_TIME; 1021 local->next_scan_state = SCAN_DECISION; 1022 if (scan_req->n_ssids) 1023 set_bit(SCAN_BEACON_WAIT, &local->scanning); 1024 return; 1025 } 1026 1027 /* active scan, send probes */ 1028 *next_delay = IEEE80211_PROBE_DELAY; 1029 local->next_scan_state = SCAN_SEND_PROBE; 1030} 1031 1032static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 1033 unsigned long *next_delay) 1034{ 1035 /* switch back to the operating channel */ 1036 local->scan_chandef.chan = NULL; 1037 ieee80211_hw_conf_chan(local); 1038 1039 /* disable PS */ 1040 ieee80211_offchannel_return(local); 1041 1042 *next_delay = HZ / 5; 1043 /* afterwards, resume scan & go to next channel */ 1044 local->next_scan_state = SCAN_RESUME; 1045} 1046 1047static void ieee80211_scan_state_resume(struct ieee80211_local *local, 1048 unsigned long *next_delay) 1049{ 1050 ieee80211_offchannel_stop_vifs(local); 1051 1052 if (local->ops->flush) { 1053 ieee80211_flush_queues(local, NULL, false); 1054 *next_delay = 0; 1055 } else 1056 *next_delay = HZ / 10; 1057 1058 /* remember when we left the operating channel */ 1059 local->leave_oper_channel_time = jiffies; 1060 1061 /* advance to the next channel to be scanned */ 1062 local->next_scan_state = SCAN_SET_CHANNEL; 1063} 1064 1065void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) 1066{ 1067 struct ieee80211_local *local = 1068 container_of(work, struct ieee80211_local, scan_work.work); 1069 struct ieee80211_sub_if_data *sdata; 1070 struct cfg80211_scan_request *scan_req; 1071 unsigned long next_delay = 0; 1072 bool aborted; 1073 1074 lockdep_assert_wiphy(local->hw.wiphy); 1075 1076 if (!ieee80211_can_run_worker(local)) { 1077 aborted = true; 1078 goto out_complete; 1079 } 1080 1081 sdata = rcu_dereference_protected(local->scan_sdata, 1082 lockdep_is_held(&local->hw.wiphy->mtx)); 1083 scan_req = rcu_dereference_protected(local->scan_req, 1084 lockdep_is_held(&local->hw.wiphy->mtx)); 1085 1086 /* When scanning on-channel, the first-callback means completed. */ 1087 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 1088 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1089 goto out_complete; 1090 } 1091 1092 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 1093 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1094 goto out_complete; 1095 } 1096 1097 if (!sdata || !scan_req) 1098 return; 1099 1100 if (!local->scanning) { 1101 int rc; 1102 1103 RCU_INIT_POINTER(local->scan_req, NULL); 1104 RCU_INIT_POINTER(local->scan_sdata, NULL); 1105 1106 rc = __ieee80211_start_scan(sdata, scan_req); 1107 if (!rc) 1108 return; 1109 /* need to complete scan in cfg80211 */ 1110 rcu_assign_pointer(local->scan_req, scan_req); 1111 aborted = true; 1112 goto out_complete; 1113 } 1114 1115 clear_bit(SCAN_BEACON_WAIT, &local->scanning); 1116 1117 /* 1118 * as long as no delay is required advance immediately 1119 * without scheduling a new work 1120 */ 1121 do { 1122 if (!ieee80211_sdata_running(sdata)) { 1123 aborted = true; 1124 goto out_complete; 1125 } 1126 1127 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) && 1128 local->next_scan_state == SCAN_DECISION) 1129 local->next_scan_state = SCAN_SEND_PROBE; 1130 1131 switch (local->next_scan_state) { 1132 case SCAN_DECISION: 1133 /* if no more bands/channels left, complete scan */ 1134 if (local->scan_channel_idx >= scan_req->n_channels) { 1135 aborted = false; 1136 goto out_complete; 1137 } 1138 ieee80211_scan_state_decision(local, &next_delay); 1139 break; 1140 case SCAN_SET_CHANNEL: 1141 ieee80211_scan_state_set_channel(local, &next_delay); 1142 break; 1143 case SCAN_SEND_PROBE: 1144 ieee80211_scan_state_send_probe(local, &next_delay); 1145 break; 1146 case SCAN_SUSPEND: 1147 ieee80211_scan_state_suspend(local, &next_delay); 1148 break; 1149 case SCAN_RESUME: 1150 ieee80211_scan_state_resume(local, &next_delay); 1151 break; 1152 case SCAN_ABORT: 1153 aborted = true; 1154 goto out_complete; 1155 } 1156 } while (next_delay == 0); 1157 1158 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 1159 next_delay); 1160 return; 1161 1162out_complete: 1163 __ieee80211_scan_completed(&local->hw, aborted); 1164} 1165 1166int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1167 struct cfg80211_scan_request *req) 1168{ 1169 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1170 1171 return __ieee80211_start_scan(sdata, req); 1172} 1173 1174int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1175 const u8 *ssid, u8 ssid_len, 1176 struct ieee80211_channel **channels, 1177 unsigned int n_channels) 1178{ 1179 struct ieee80211_local *local = sdata->local; 1180 int ret = -EBUSY, i, n_ch = 0; 1181 enum nl80211_band band; 1182 1183 lockdep_assert_wiphy(local->hw.wiphy); 1184 1185 /* busy scanning */ 1186 if (local->scan_req) 1187 goto unlock; 1188 1189 /* fill internal scan request */ 1190 if (!channels) { 1191 int max_n; 1192 1193 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1194 if (!local->hw.wiphy->bands[band] || 1195 band == NL80211_BAND_6GHZ) 1196 continue; 1197 1198 max_n = local->hw.wiphy->bands[band]->n_channels; 1199 for (i = 0; i < max_n; i++) { 1200 struct ieee80211_channel *tmp_ch = 1201 &local->hw.wiphy->bands[band]->channels[i]; 1202 1203 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1204 IEEE80211_CHAN_DISABLED)) 1205 continue; 1206 1207 local->int_scan_req->channels[n_ch] = tmp_ch; 1208 n_ch++; 1209 } 1210 } 1211 1212 if (WARN_ON_ONCE(n_ch == 0)) 1213 goto unlock; 1214 1215 local->int_scan_req->n_channels = n_ch; 1216 } else { 1217 for (i = 0; i < n_channels; i++) { 1218 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1219 IEEE80211_CHAN_DISABLED)) 1220 continue; 1221 1222 local->int_scan_req->channels[n_ch] = channels[i]; 1223 n_ch++; 1224 } 1225 1226 if (WARN_ON_ONCE(n_ch == 0)) 1227 goto unlock; 1228 1229 local->int_scan_req->n_channels = n_ch; 1230 } 1231 1232 local->int_scan_req->ssids = &local->scan_ssid; 1233 local->int_scan_req->n_ssids = 1; 1234 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1235 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1236 1237 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1238 unlock: 1239 return ret; 1240} 1241 1242void ieee80211_scan_cancel(struct ieee80211_local *local) 1243{ 1244 /* ensure a new scan cannot be queued */ 1245 lockdep_assert_wiphy(local->hw.wiphy); 1246 1247 /* 1248 * We are canceling software scan, or deferred scan that was not 1249 * yet really started (see __ieee80211_start_scan ). 1250 * 1251 * Regarding hardware scan: 1252 * - we can not call __ieee80211_scan_completed() as when 1253 * SCAN_HW_SCANNING bit is set this function change 1254 * local->hw_scan_req to operate on 5G band, what race with 1255 * driver which can use local->hw_scan_req 1256 * 1257 * - we can not cancel scan_work since driver can schedule it 1258 * by ieee80211_scan_completed(..., true) to finish scan 1259 * 1260 * Hence we only call the cancel_hw_scan() callback, but the low-level 1261 * driver is still responsible for calling ieee80211_scan_completed() 1262 * after the scan was completed/aborted. 1263 */ 1264 1265 if (!local->scan_req) 1266 return; 1267 1268 /* 1269 * We have a scan running and the driver already reported completion, 1270 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1271 * cancelled. 1272 */ 1273 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1274 test_bit(SCAN_COMPLETED, &local->scanning)) { 1275 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1276 return; 1277 } 1278 1279 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1280 /* 1281 * Make sure that __ieee80211_scan_completed doesn't trigger a 1282 * scan on another band. 1283 */ 1284 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1285 if (local->ops->cancel_hw_scan) 1286 drv_cancel_hw_scan(local, 1287 rcu_dereference_protected(local->scan_sdata, 1288 lockdep_is_held(&local->hw.wiphy->mtx))); 1289 return; 1290 } 1291 1292 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work); 1293 /* and clean up */ 1294 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1295 __ieee80211_scan_completed(&local->hw, true); 1296} 1297 1298int __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 struct ieee80211_scan_ies sched_scan_ies = {}; 1303 struct cfg80211_chan_def chandef; 1304 int ret, i, iebufsz, num_bands = 0; 1305 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1306 u8 bands_used = 0; 1307 u8 *ie; 1308 u32 flags = 0; 1309 1310 lockdep_assert_wiphy(local->hw.wiphy); 1311 1312 iebufsz = local->scan_ies_len + req->ie_len; 1313 1314 if (!local->ops->sched_scan_start) 1315 return -EOPNOTSUPP; 1316 1317 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1318 if (local->hw.wiphy->bands[i]) { 1319 bands_used |= BIT(i); 1320 rate_masks[i] = (u32) -1; 1321 num_bands++; 1322 } 1323 } 1324 1325 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1326 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1327 1328 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1329 if (!ie) { 1330 ret = -ENOMEM; 1331 goto out; 1332 } 1333 1334 ieee80211_prepare_scan_chandef(&chandef); 1335 1336 ret = ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, 1337 &sched_scan_ies, req->ie, 1338 req->ie_len, bands_used, rate_masks, 1339 &chandef, flags); 1340 if (ret < 0) 1341 goto error; 1342 1343 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1344 if (ret == 0) { 1345 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1346 rcu_assign_pointer(local->sched_scan_req, req); 1347 } 1348 1349error: 1350 kfree(ie); 1351out: 1352 if (ret) { 1353 /* Clean in case of failure after HW restart or upon resume. */ 1354 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1355 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1356 } 1357 1358 return ret; 1359} 1360 1361int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1362 struct cfg80211_sched_scan_request *req) 1363{ 1364 struct ieee80211_local *local = sdata->local; 1365 1366 lockdep_assert_wiphy(local->hw.wiphy); 1367 1368 if (rcu_access_pointer(local->sched_scan_sdata)) 1369 return -EBUSY; 1370 1371 return __ieee80211_request_sched_scan_start(sdata, req); 1372} 1373 1374int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1375{ 1376 struct ieee80211_sub_if_data *sched_scan_sdata; 1377 int ret = -ENOENT; 1378 1379 lockdep_assert_wiphy(local->hw.wiphy); 1380 1381 if (!local->ops->sched_scan_stop) 1382 return -EOPNOTSUPP; 1383 1384 /* We don't want to restart sched scan anymore. */ 1385 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1386 1387 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1388 lockdep_is_held(&local->hw.wiphy->mtx)); 1389 if (sched_scan_sdata) { 1390 ret = drv_sched_scan_stop(local, sched_scan_sdata); 1391 if (!ret) 1392 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1393 } 1394 1395 return ret; 1396} 1397 1398void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1399{ 1400 struct ieee80211_local *local = hw_to_local(hw); 1401 1402 trace_api_sched_scan_results(local); 1403 1404 cfg80211_sched_scan_results(hw->wiphy, 0); 1405} 1406EXPORT_SYMBOL(ieee80211_sched_scan_results); 1407 1408void ieee80211_sched_scan_end(struct ieee80211_local *local) 1409{ 1410 lockdep_assert_wiphy(local->hw.wiphy); 1411 1412 if (!rcu_access_pointer(local->sched_scan_sdata)) 1413 return; 1414 1415 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1416 1417 /* If sched scan was aborted by the driver. */ 1418 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1419 1420 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0); 1421} 1422 1423void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, 1424 struct wiphy_work *work) 1425{ 1426 struct ieee80211_local *local = 1427 container_of(work, struct ieee80211_local, 1428 sched_scan_stopped_work); 1429 1430 ieee80211_sched_scan_end(local); 1431} 1432 1433void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1434{ 1435 struct ieee80211_local *local = hw_to_local(hw); 1436 1437 trace_api_sched_scan_stopped(local); 1438 1439 /* 1440 * this shouldn't really happen, so for simplicity 1441 * simply ignore it, and let mac80211 reconfigure 1442 * the sched scan later on. 1443 */ 1444 if (local->in_reconfig) 1445 return; 1446 1447 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work); 1448} 1449EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1450