1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Scanning implementation 4 * 5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 6 * Copyright 2004, Instant802 Networks, Inc. 7 * Copyright 2005, Devicescape Software, Inc. 8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 10 * Copyright 2013-2015 Intel Mobile Communications GmbH 11 * Copyright 2016-2017 Intel Deutschland GmbH 12 * Copyright (C) 2018-2023 Intel Corporation 13 */ 14 15 #include <linux/if_arp.h> 16 #include <linux/etherdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <net/sch_generic.h> 19 #include <linux/slab.h> 20 #include <linux/export.h> 21 #include <linux/random.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "mesh.h" 27 28 #define IEEE80211_PROBE_DELAY (HZ / 33) 29 #define IEEE80211_CHANNEL_TIME (HZ / 33) 30 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) 31 32 void ieee80211_rx_bss_put(struct ieee80211_local *local, 33 struct ieee80211_bss *bss) 34 { 35 if (!bss) 36 return; 37 cfg80211_put_bss(local->hw.wiphy, 38 container_of((void *)bss, struct cfg80211_bss, priv)); 39 } 40 41 static bool is_uapsd_supported(struct ieee802_11_elems *elems) 42 { 43 u8 qos_info; 44 45 if (elems->wmm_info && elems->wmm_info_len == 7 46 && elems->wmm_info[5] == 1) 47 qos_info = elems->wmm_info[6]; 48 else if (elems->wmm_param && elems->wmm_param_len == 24 49 && elems->wmm_param[5] == 1) 50 qos_info = elems->wmm_param[6]; 51 else 52 /* no valid wmm information or parameter element found */ 53 return false; 54 55 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; 56 } 57 58 struct inform_bss_update_data { 59 struct ieee80211_rx_status *rx_status; 60 bool beacon; 61 }; 62 63 void ieee80211_inform_bss(struct wiphy *wiphy, 64 struct cfg80211_bss *cbss, 65 const struct cfg80211_bss_ies *ies, 66 void *data) 67 { 68 struct ieee80211_local *local = wiphy_priv(wiphy); 69 struct inform_bss_update_data *update_data = data; 70 struct ieee80211_bss *bss = (void *)cbss->priv; 71 struct ieee80211_rx_status *rx_status; 72 struct ieee802_11_elems *elems; 73 int clen, srlen; 74 75 /* This happens while joining an IBSS */ 76 if (!update_data) 77 return; 78 79 elems = ieee802_11_parse_elems(ies->data, ies->len, false, NULL); 80 if (!elems) 81 return; 82 83 rx_status = update_data->rx_status; 84 85 if (update_data->beacon) 86 bss->device_ts_beacon = rx_status->device_timestamp; 87 else 88 bss->device_ts_presp = rx_status->device_timestamp; 89 90 if (elems->parse_error) { 91 if (update_data->beacon) 92 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; 93 else 94 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; 95 } else { 96 if (update_data->beacon) 97 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; 98 else 99 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; 100 } 101 102 /* save the ERP value so that it is available at association time */ 103 if (elems->erp_info && (!elems->parse_error || 104 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { 105 bss->erp_value = elems->erp_info[0]; 106 bss->has_erp_value = true; 107 if (!elems->parse_error) 108 bss->valid_data |= IEEE80211_BSS_VALID_ERP; 109 } 110 111 /* replace old supported rates if we get new values */ 112 if (!elems->parse_error || 113 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { 114 srlen = 0; 115 if (elems->supp_rates) { 116 clen = IEEE80211_MAX_SUPP_RATES; 117 if (clen > elems->supp_rates_len) 118 clen = elems->supp_rates_len; 119 memcpy(bss->supp_rates, elems->supp_rates, clen); 120 srlen += clen; 121 } 122 if (elems->ext_supp_rates) { 123 clen = IEEE80211_MAX_SUPP_RATES - srlen; 124 if (clen > elems->ext_supp_rates_len) 125 clen = elems->ext_supp_rates_len; 126 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, 127 clen); 128 srlen += clen; 129 } 130 if (srlen) { 131 bss->supp_rates_len = srlen; 132 if (!elems->parse_error) 133 bss->valid_data |= IEEE80211_BSS_VALID_RATES; 134 } 135 } 136 137 if (!elems->parse_error || 138 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { 139 bss->wmm_used = elems->wmm_param || elems->wmm_info; 140 bss->uapsd_supported = is_uapsd_supported(elems); 141 if (!elems->parse_error) 142 bss->valid_data |= IEEE80211_BSS_VALID_WMM; 143 } 144 145 if (update_data->beacon) { 146 struct ieee80211_supported_band *sband = 147 local->hw.wiphy->bands[rx_status->band]; 148 if (!(rx_status->encoding == RX_ENC_HT) && 149 !(rx_status->encoding == RX_ENC_VHT)) 150 bss->beacon_rate = 151 &sband->bitrates[rx_status->rate_idx]; 152 } 153 154 if (elems->vht_cap_elem) 155 bss->vht_cap_info = 156 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 157 else 158 bss->vht_cap_info = 0; 159 160 kfree(elems); 161 } 162 163 struct ieee80211_bss * 164 ieee80211_bss_info_update(struct ieee80211_local *local, 165 struct ieee80211_rx_status *rx_status, 166 struct ieee80211_mgmt *mgmt, size_t len, 167 struct ieee80211_channel *channel) 168 { 169 bool beacon = ieee80211_is_beacon(mgmt->frame_control) || 170 ieee80211_is_s1g_beacon(mgmt->frame_control); 171 struct cfg80211_bss *cbss; 172 struct inform_bss_update_data update_data = { 173 .rx_status = rx_status, 174 .beacon = beacon, 175 }; 176 struct cfg80211_inform_bss bss_meta = { 177 .boottime_ns = rx_status->boottime_ns, 178 .drv_data = (void *)&update_data, 179 }; 180 bool signal_valid; 181 struct ieee80211_sub_if_data *scan_sdata; 182 183 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL) 184 bss_meta.signal = 0; /* invalid signal indication */ 185 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) 186 bss_meta.signal = rx_status->signal * 100; 187 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) 188 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal; 189 190 bss_meta.chan = channel; 191 192 rcu_read_lock(); 193 scan_sdata = rcu_dereference(local->scan_sdata); 194 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && 195 scan_sdata->vif.cfg.assoc && 196 ieee80211_have_rx_timestamp(rx_status)) { 197 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 u32 scan_flags, const u8 *da) 241 { 242 if (!sdata) 243 return false; 244 /* accept broadcast for OCE */ 245 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && 246 is_broadcast_ether_addr(da)) 247 return true; 248 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 249 return true; 250 return ether_addr_equal(da, sdata->vif.addr); 251 } 252 253 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 254 { 255 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 256 struct ieee80211_sub_if_data *sdata1, *sdata2; 257 struct ieee80211_mgmt *mgmt = (void *)skb->data; 258 struct ieee80211_bss *bss; 259 struct ieee80211_channel *channel; 260 size_t min_hdr_len = offsetof(struct ieee80211_mgmt, 261 u.probe_resp.variable); 262 263 if (!ieee80211_is_probe_resp(mgmt->frame_control) && 264 !ieee80211_is_beacon(mgmt->frame_control) && 265 !ieee80211_is_s1g_beacon(mgmt->frame_control)) 266 return; 267 268 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { 269 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) 270 min_hdr_len = offsetof(struct ieee80211_ext, 271 u.s1g_short_beacon.variable); 272 else 273 min_hdr_len = offsetof(struct ieee80211_ext, 274 u.s1g_beacon); 275 } 276 277 if (skb->len < min_hdr_len) 278 return; 279 280 sdata1 = rcu_dereference(local->scan_sdata); 281 sdata2 = rcu_dereference(local->sched_scan_sdata); 282 283 if (likely(!sdata1 && !sdata2)) 284 return; 285 286 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) { 287 /* 288 * we were passive scanning because of radar/no-IR, but 289 * the beacon/proberesp rx gives us an opportunity to upgrade 290 * to active scan 291 */ 292 set_bit(SCAN_BEACON_DONE, &local->scanning); 293 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 294 } 295 296 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 297 struct cfg80211_scan_request *scan_req; 298 struct cfg80211_sched_scan_request *sched_scan_req; 299 u32 scan_req_flags = 0, sched_scan_req_flags = 0; 300 301 scan_req = rcu_dereference(local->scan_req); 302 sched_scan_req = rcu_dereference(local->sched_scan_req); 303 304 if (scan_req) 305 scan_req_flags = scan_req->flags; 306 307 if (sched_scan_req) 308 sched_scan_req_flags = sched_scan_req->flags; 309 310 /* ignore ProbeResp to foreign address or non-bcast (OCE) 311 * unless scanning with randomised address 312 */ 313 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, 314 mgmt->da) && 315 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, 316 mgmt->da)) 317 return; 318 } 319 320 channel = ieee80211_get_channel_khz(local->hw.wiphy, 321 ieee80211_rx_status_to_khz(rx_status)); 322 323 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 324 return; 325 326 bss = ieee80211_bss_info_update(local, rx_status, 327 mgmt, skb->len, 328 channel); 329 if (bss) 330 ieee80211_rx_bss_put(local, bss); 331 } 332 333 static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef) 334 { 335 memset(chandef, 0, sizeof(*chandef)); 336 337 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 338 } 339 340 /* return false if no more work */ 341 static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) 342 { 343 struct ieee80211_local *local = sdata->local; 344 struct cfg80211_scan_request *req; 345 struct cfg80211_chan_def chandef; 346 u8 bands_used = 0; 347 int i, ielen, n_chans; 348 u32 flags = 0; 349 350 req = rcu_dereference_protected(local->scan_req, 351 lockdep_is_held(&local->hw.wiphy->mtx)); 352 353 if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) 354 return false; 355 356 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 357 for (i = 0; i < req->n_channels; i++) { 358 local->hw_scan_req->req.channels[i] = req->channels[i]; 359 bands_used |= BIT(req->channels[i]->band); 360 } 361 362 n_chans = req->n_channels; 363 } else { 364 do { 365 if (local->hw_scan_band == NUM_NL80211_BANDS) 366 return false; 367 368 n_chans = 0; 369 370 for (i = 0; i < req->n_channels; i++) { 371 if (req->channels[i]->band != 372 local->hw_scan_band) 373 continue; 374 local->hw_scan_req->req.channels[n_chans] = 375 req->channels[i]; 376 n_chans++; 377 bands_used |= BIT(req->channels[i]->band); 378 } 379 380 local->hw_scan_band++; 381 } while (!n_chans); 382 } 383 384 local->hw_scan_req->req.n_channels = n_chans; 385 ieee80211_prepare_scan_chandef(&chandef); 386 387 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 388 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 389 390 ielen = ieee80211_build_preq_ies(sdata, 391 (u8 *)local->hw_scan_req->req.ie, 392 local->hw_scan_ies_bufsize, 393 &local->hw_scan_req->ies, 394 req->ie, req->ie_len, 395 bands_used, req->rates, &chandef, 396 flags); 397 local->hw_scan_req->req.ie_len = ielen; 398 local->hw_scan_req->req.no_cck = req->no_cck; 399 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); 400 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, 401 req->mac_addr_mask); 402 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); 403 404 return true; 405 } 406 407 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 408 { 409 struct ieee80211_local *local = hw_to_local(hw); 410 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 411 bool was_scanning = local->scanning; 412 struct cfg80211_scan_request *scan_req; 413 struct ieee80211_sub_if_data *scan_sdata; 414 struct ieee80211_sub_if_data *sdata; 415 416 lockdep_assert_wiphy(local->hw.wiphy); 417 418 /* 419 * It's ok to abort a not-yet-running scan (that 420 * we have one at all will be verified by checking 421 * local->scan_req next), but not to complete it 422 * successfully. 423 */ 424 if (WARN_ON(!local->scanning && !aborted)) 425 aborted = true; 426 427 if (WARN_ON(!local->scan_req)) 428 return; 429 430 scan_sdata = rcu_dereference_protected(local->scan_sdata, 431 lockdep_is_held(&local->hw.wiphy->mtx)); 432 433 if (hw_scan && !aborted && 434 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && 435 ieee80211_prep_hw_scan(scan_sdata)) { 436 int rc; 437 438 rc = drv_hw_scan(local, 439 rcu_dereference_protected(local->scan_sdata, 440 lockdep_is_held(&local->hw.wiphy->mtx)), 441 local->hw_scan_req); 442 443 if (rc == 0) 444 return; 445 446 /* HW scan failed and is going to be reported as aborted, 447 * so clear old scan info. 448 */ 449 memset(&local->scan_info, 0, sizeof(local->scan_info)); 450 aborted = true; 451 } 452 453 kfree(local->hw_scan_req); 454 local->hw_scan_req = NULL; 455 456 scan_req = rcu_dereference_protected(local->scan_req, 457 lockdep_is_held(&local->hw.wiphy->mtx)); 458 459 RCU_INIT_POINTER(local->scan_req, NULL); 460 RCU_INIT_POINTER(local->scan_sdata, NULL); 461 462 local->scanning = 0; 463 local->scan_chandef.chan = NULL; 464 465 synchronize_rcu(); 466 467 if (scan_req != local->int_scan_req) { 468 local->scan_info.aborted = aborted; 469 cfg80211_scan_done(scan_req, &local->scan_info); 470 } 471 472 /* Set power back to normal operating levels. */ 473 ieee80211_hw_config(local, 0); 474 475 if (!hw_scan && was_scanning) { 476 ieee80211_configure_filter(local); 477 drv_sw_scan_complete(local, scan_sdata); 478 ieee80211_offchannel_return(local); 479 } 480 481 ieee80211_recalc_idle(local); 482 483 ieee80211_mlme_notify_scan_completed(local); 484 ieee80211_ibss_notify_scan_completed(local); 485 486 /* Requeue all the work that might have been ignored while 487 * the scan was in progress; if there was none this will 488 * just be a no-op for the particular interface. 489 */ 490 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 491 if (ieee80211_sdata_running(sdata)) 492 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 493 } 494 495 if (was_scanning) 496 ieee80211_start_next_roc(local); 497 } 498 499 void ieee80211_scan_completed(struct ieee80211_hw *hw, 500 struct cfg80211_scan_info *info) 501 { 502 struct ieee80211_local *local = hw_to_local(hw); 503 504 trace_api_scan_completed(local, info->aborted); 505 506 set_bit(SCAN_COMPLETED, &local->scanning); 507 if (info->aborted) 508 set_bit(SCAN_ABORTED, &local->scanning); 509 510 memcpy(&local->scan_info, info, sizeof(*info)); 511 512 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 513 } 514 EXPORT_SYMBOL(ieee80211_scan_completed); 515 516 static int ieee80211_start_sw_scan(struct ieee80211_local *local, 517 struct ieee80211_sub_if_data *sdata) 518 { 519 /* Software scan is not supported in multi-channel cases */ 520 if (local->use_chanctx) 521 return -EOPNOTSUPP; 522 523 /* 524 * Hardware/driver doesn't support hw_scan, so use software 525 * scanning instead. First send a nullfunc frame with power save 526 * bit on so that AP will buffer the frames for us while we are not 527 * listening, then send probe requests to each channel and wait for 528 * the responses. After all channels are scanned, tune back to the 529 * original channel and send a nullfunc frame with power save bit 530 * off to trigger the AP to send us all the buffered frames. 531 * 532 * Note that while local->sw_scanning is true everything else but 533 * nullfunc frames and probe requests will be dropped in 534 * ieee80211_tx_h_check_assoc(). 535 */ 536 drv_sw_scan_start(local, sdata, local->scan_addr); 537 538 local->leave_oper_channel_time = jiffies; 539 local->next_scan_state = SCAN_DECISION; 540 local->scan_channel_idx = 0; 541 542 ieee80211_offchannel_stop_vifs(local); 543 544 /* ensure nullfunc is transmitted before leaving operating channel */ 545 ieee80211_flush_queues(local, NULL, false); 546 547 ieee80211_configure_filter(local); 548 549 /* We need to set power level at maximum rate for scanning. */ 550 ieee80211_hw_config(local, 0); 551 552 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 553 554 return 0; 555 } 556 557 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) 558 { 559 struct ieee80211_local *local = sdata->local; 560 struct ieee80211_sub_if_data *sdata_iter; 561 562 lockdep_assert_wiphy(local->hw.wiphy); 563 564 if (!ieee80211_is_radar_required(local)) 565 return true; 566 567 if (!regulatory_pre_cac_allowed(local->hw.wiphy)) 568 return false; 569 570 list_for_each_entry(sdata_iter, &local->interfaces, list) { 571 if (sdata_iter->wdev.cac_started) 572 return false; 573 } 574 575 return true; 576 } 577 578 static bool ieee80211_can_scan(struct ieee80211_local *local, 579 struct ieee80211_sub_if_data *sdata) 580 { 581 if (!__ieee80211_can_leave_ch(sdata)) 582 return false; 583 584 if (!list_empty(&local->roc_list)) 585 return false; 586 587 if (sdata->vif.type == NL80211_IFTYPE_STATION && 588 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 589 return false; 590 591 return true; 592 } 593 594 void ieee80211_run_deferred_scan(struct ieee80211_local *local) 595 { 596 lockdep_assert_wiphy(local->hw.wiphy); 597 598 if (!local->scan_req || local->scanning) 599 return; 600 601 if (!ieee80211_can_scan(local, 602 rcu_dereference_protected( 603 local->scan_sdata, 604 lockdep_is_held(&local->hw.wiphy->mtx)))) 605 return; 606 607 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 608 round_jiffies_relative(0)); 609 } 610 611 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 612 const u8 *src, const u8 *dst, 613 const u8 *ssid, size_t ssid_len, 614 const u8 *ie, size_t ie_len, 615 u32 ratemask, u32 flags, u32 tx_flags, 616 struct ieee80211_channel *channel) 617 { 618 struct sk_buff *skb; 619 620 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 621 ssid, ssid_len, 622 ie, ie_len, flags); 623 624 if (skb) { 625 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 626 struct ieee80211_hdr *hdr = (void *)skb->data; 627 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 628 u16 sn = get_random_u16(); 629 630 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 631 hdr->seq_ctrl = 632 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 633 } 634 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 635 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); 636 } 637 } 638 639 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 640 unsigned long *next_delay) 641 { 642 int i; 643 struct ieee80211_sub_if_data *sdata; 644 struct cfg80211_scan_request *scan_req; 645 enum nl80211_band band = local->hw.conf.chandef.chan->band; 646 u32 flags = 0, tx_flags; 647 648 scan_req = rcu_dereference_protected(local->scan_req, 649 lockdep_is_held(&local->hw.wiphy->mtx)); 650 651 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 652 if (scan_req->no_cck) 653 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 654 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 655 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 656 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 657 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 658 659 sdata = rcu_dereference_protected(local->scan_sdata, 660 lockdep_is_held(&local->hw.wiphy->mtx)); 661 662 for (i = 0; i < scan_req->n_ssids; i++) 663 ieee80211_send_scan_probe_req( 664 sdata, local->scan_addr, scan_req->bssid, 665 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 666 scan_req->ie, scan_req->ie_len, 667 scan_req->rates[band], flags, 668 tx_flags, local->hw.conf.chandef.chan); 669 670 /* 671 * After sending probe requests, wait for probe responses 672 * on the channel. 673 */ 674 *next_delay = msecs_to_jiffies(scan_req->duration) > 675 IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ? 676 msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY : 677 IEEE80211_CHANNEL_TIME; 678 local->next_scan_state = SCAN_DECISION; 679 } 680 681 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 682 struct cfg80211_scan_request *req) 683 { 684 struct ieee80211_local *local = sdata->local; 685 bool hw_scan = local->ops->hw_scan; 686 int rc; 687 688 lockdep_assert_wiphy(local->hw.wiphy); 689 690 if (local->scan_req) 691 return -EBUSY; 692 693 /* For an MLO connection, if a link ID was specified, validate that it 694 * is indeed active. If no link ID was specified, select one of the 695 * active links. 696 */ 697 if (ieee80211_vif_is_mld(&sdata->vif)) { 698 if (req->tsf_report_link_id >= 0) { 699 if (!(sdata->vif.active_links & 700 BIT(req->tsf_report_link_id))) 701 return -EINVAL; 702 } else { 703 req->tsf_report_link_id = 704 __ffs(sdata->vif.active_links); 705 } 706 } 707 708 if (!__ieee80211_can_leave_ch(sdata)) 709 return -EBUSY; 710 711 if (!ieee80211_can_scan(local, sdata)) { 712 /* wait for the work to finish/time out */ 713 rcu_assign_pointer(local->scan_req, req); 714 rcu_assign_pointer(local->scan_sdata, sdata); 715 return 0; 716 } 717 718 again: 719 if (hw_scan) { 720 u8 *ies; 721 722 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 723 724 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 725 int i, n_bands = 0; 726 u8 bands_counted = 0; 727 728 for (i = 0; i < req->n_channels; i++) { 729 if (bands_counted & BIT(req->channels[i]->band)) 730 continue; 731 bands_counted |= BIT(req->channels[i]->band); 732 n_bands++; 733 } 734 735 local->hw_scan_ies_bufsize *= n_bands; 736 } 737 738 local->hw_scan_req = kmalloc( 739 sizeof(*local->hw_scan_req) + 740 req->n_channels * sizeof(req->channels[0]) + 741 local->hw_scan_ies_bufsize, GFP_KERNEL); 742 if (!local->hw_scan_req) 743 return -ENOMEM; 744 745 local->hw_scan_req->req.ssids = req->ssids; 746 local->hw_scan_req->req.n_ssids = req->n_ssids; 747 ies = (u8 *)local->hw_scan_req + 748 sizeof(*local->hw_scan_req) + 749 req->n_channels * sizeof(req->channels[0]); 750 local->hw_scan_req->req.ie = ies; 751 local->hw_scan_req->req.flags = req->flags; 752 eth_broadcast_addr(local->hw_scan_req->req.bssid); 753 local->hw_scan_req->req.duration = req->duration; 754 local->hw_scan_req->req.duration_mandatory = 755 req->duration_mandatory; 756 local->hw_scan_req->req.tsf_report_link_id = 757 req->tsf_report_link_id; 758 759 local->hw_scan_band = 0; 760 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; 761 local->hw_scan_req->req.scan_6ghz_params = 762 req->scan_6ghz_params; 763 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; 764 765 /* 766 * After allocating local->hw_scan_req, we must 767 * go through until ieee80211_prep_hw_scan(), so 768 * anything that might be changed here and leave 769 * this function early must not go after this 770 * allocation. 771 */ 772 } 773 774 rcu_assign_pointer(local->scan_req, req); 775 rcu_assign_pointer(local->scan_sdata, sdata); 776 777 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 778 get_random_mask_addr(local->scan_addr, 779 req->mac_addr, 780 req->mac_addr_mask); 781 else 782 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 783 784 if (hw_scan) { 785 __set_bit(SCAN_HW_SCANNING, &local->scanning); 786 } else if ((req->n_channels == 1) && 787 (req->channels[0] == local->_oper_chandef.chan)) { 788 /* 789 * If we are scanning only on the operating channel 790 * then we do not need to stop normal activities 791 */ 792 unsigned long next_delay; 793 794 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 795 796 ieee80211_recalc_idle(local); 797 798 /* Notify driver scan is starting, keep order of operations 799 * same as normal software scan, in case that matters. */ 800 drv_sw_scan_start(local, sdata, local->scan_addr); 801 802 ieee80211_configure_filter(local); /* accept probe-responses */ 803 804 /* We need to ensure power level is at max for scanning. */ 805 ieee80211_hw_config(local, 0); 806 807 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 808 IEEE80211_CHAN_RADAR)) || 809 !req->n_ssids) { 810 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 811 if (req->n_ssids) 812 set_bit(SCAN_BEACON_WAIT, &local->scanning); 813 } else { 814 ieee80211_scan_state_send_probe(local, &next_delay); 815 next_delay = IEEE80211_CHANNEL_TIME; 816 } 817 818 /* Now, just wait a bit and we are all done! */ 819 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 820 next_delay); 821 return 0; 822 } else { 823 /* Do normal software scan */ 824 __set_bit(SCAN_SW_SCANNING, &local->scanning); 825 } 826 827 ieee80211_recalc_idle(local); 828 829 if (hw_scan) { 830 WARN_ON(!ieee80211_prep_hw_scan(sdata)); 831 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 832 } else { 833 rc = ieee80211_start_sw_scan(local, sdata); 834 } 835 836 if (rc) { 837 kfree(local->hw_scan_req); 838 local->hw_scan_req = NULL; 839 local->scanning = 0; 840 841 ieee80211_recalc_idle(local); 842 843 local->scan_req = NULL; 844 RCU_INIT_POINTER(local->scan_sdata, NULL); 845 } 846 847 if (hw_scan && rc == 1) { 848 /* 849 * we can't fall back to software for P2P-GO 850 * as it must update NoA etc. 851 */ 852 if (ieee80211_vif_type_p2p(&sdata->vif) == 853 NL80211_IFTYPE_P2P_GO) 854 return -EOPNOTSUPP; 855 hw_scan = false; 856 goto again; 857 } 858 859 return rc; 860 } 861 862 static unsigned long 863 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 864 { 865 /* 866 * TODO: channel switching also consumes quite some time, 867 * add that delay as well to get a better estimation 868 */ 869 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 870 return IEEE80211_PASSIVE_CHANNEL_TIME; 871 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 872 } 873 874 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 875 unsigned long *next_delay) 876 { 877 bool associated = false; 878 bool tx_empty = true; 879 bool bad_latency; 880 struct ieee80211_sub_if_data *sdata; 881 struct ieee80211_channel *next_chan; 882 enum mac80211_scan_state next_scan_state; 883 struct cfg80211_scan_request *scan_req; 884 885 lockdep_assert_wiphy(local->hw.wiphy); 886 887 /* 888 * check if at least one STA interface is associated, 889 * check if at least one STA interface has pending tx frames 890 * and grab the lowest used beacon interval 891 */ 892 list_for_each_entry(sdata, &local->interfaces, list) { 893 if (!ieee80211_sdata_running(sdata)) 894 continue; 895 896 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 897 if (sdata->u.mgd.associated) { 898 associated = true; 899 900 if (!qdisc_all_tx_empty(sdata->dev)) { 901 tx_empty = false; 902 break; 903 } 904 } 905 } 906 } 907 908 scan_req = rcu_dereference_protected(local->scan_req, 909 lockdep_is_held(&local->hw.wiphy->mtx)); 910 911 next_chan = scan_req->channels[local->scan_channel_idx]; 912 913 /* 914 * we're currently scanning a different channel, let's 915 * see if we can scan another channel without interfering 916 * with the current traffic situation. 917 * 918 * Keep good latency, do not stay off-channel more than 125 ms. 919 */ 920 921 bad_latency = time_after(jiffies + 922 ieee80211_scan_get_channel_time(next_chan), 923 local->leave_oper_channel_time + HZ / 8); 924 925 if (associated && !tx_empty) { 926 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 927 next_scan_state = SCAN_ABORT; 928 else 929 next_scan_state = SCAN_SUSPEND; 930 } else if (associated && bad_latency) { 931 next_scan_state = SCAN_SUSPEND; 932 } else { 933 next_scan_state = SCAN_SET_CHANNEL; 934 } 935 936 local->next_scan_state = next_scan_state; 937 938 *next_delay = 0; 939 } 940 941 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 942 unsigned long *next_delay) 943 { 944 int skip; 945 struct ieee80211_channel *chan; 946 struct cfg80211_scan_request *scan_req; 947 948 scan_req = rcu_dereference_protected(local->scan_req, 949 lockdep_is_held(&local->hw.wiphy->mtx)); 950 951 skip = 0; 952 chan = scan_req->channels[local->scan_channel_idx]; 953 954 local->scan_chandef.chan = chan; 955 local->scan_chandef.center_freq1 = chan->center_freq; 956 local->scan_chandef.freq1_offset = chan->freq_offset; 957 local->scan_chandef.center_freq2 = 0; 958 959 /* For scanning on the S1G band, detect the channel width according to 960 * the channel being scanned. 961 */ 962 if (chan->band == NL80211_BAND_S1GHZ) { 963 local->scan_chandef.width = ieee80211_s1g_channel_width(chan); 964 goto set_channel; 965 } 966 967 /* If scanning on oper channel, use whatever channel-type 968 * is currently in use. 969 */ 970 if (chan == local->_oper_chandef.chan) 971 local->scan_chandef = local->_oper_chandef; 972 else 973 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 974 975 set_channel: 976 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 977 skip = 1; 978 979 /* advance state machine to next channel/band */ 980 local->scan_channel_idx++; 981 982 if (skip) { 983 /* if we skip this channel return to the decision state */ 984 local->next_scan_state = SCAN_DECISION; 985 return; 986 } 987 988 /* 989 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 990 * (which unfortunately doesn't say _why_ step a) is done, 991 * but it waits for the probe delay or until a frame is 992 * received - and the received frame would update the NAV). 993 * For now, we do not support waiting until a frame is 994 * received. 995 * 996 * In any case, it is not necessary for a passive scan. 997 */ 998 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 999 !scan_req->n_ssids) { 1000 *next_delay = msecs_to_jiffies(scan_req->duration) > 1001 IEEE80211_PASSIVE_CHANNEL_TIME ? 1002 msecs_to_jiffies(scan_req->duration) : 1003 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