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_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 } 346 347 static 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 */ 355 static 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 } 422 423 static 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 } 514 515 void 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 } 530 EXPORT_SYMBOL(ieee80211_scan_completed); 531 532 static 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 } 572 573 static 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 } 593 594 static 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 } 609 610 void 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 } 626 627 static 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_tx_skb_tid_band(sdata, skb, 7, channel->band); 652 } 653 } 654 655 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 656 unsigned long *next_delay) 657 { 658 int i; 659 struct ieee80211_sub_if_data *sdata; 660 struct cfg80211_scan_request *scan_req; 661 enum nl80211_band band = local->hw.conf.chandef.chan->band; 662 u32 flags = 0, tx_flags; 663 664 scan_req = rcu_dereference_protected(local->scan_req, 665 lockdep_is_held(&local->hw.wiphy->mtx)); 666 667 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 668 if (scan_req->no_cck) 669 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 670 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 671 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 672 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 673 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 674 675 sdata = rcu_dereference_protected(local->scan_sdata, 676 lockdep_is_held(&local->hw.wiphy->mtx)); 677 678 for (i = 0; i < scan_req->n_ssids; i++) 679 ieee80211_send_scan_probe_req( 680 sdata, local->scan_addr, scan_req->bssid, 681 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 682 scan_req->ie, scan_req->ie_len, 683 scan_req->rates[band], flags, 684 tx_flags, local->hw.conf.chandef.chan); 685 686 /* 687 * After sending probe requests, wait for probe responses 688 * on the channel. 689 */ 690 *next_delay = msecs_to_jiffies(scan_req->duration) > 691 IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ? 692 msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY : 693 IEEE80211_CHANNEL_TIME; 694 local->next_scan_state = SCAN_DECISION; 695 } 696 697 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 698 struct cfg80211_scan_request *req) 699 { 700 struct ieee80211_local *local = sdata->local; 701 bool hw_scan = local->ops->hw_scan; 702 int rc; 703 704 lockdep_assert_wiphy(local->hw.wiphy); 705 706 if (local->scan_req) 707 return -EBUSY; 708 709 /* For an MLO connection, if a link ID was specified, validate that it 710 * is indeed active. If no link ID was specified, select one of the 711 * active links. 712 */ 713 if (ieee80211_vif_is_mld(&sdata->vif)) { 714 if (req->tsf_report_link_id >= 0) { 715 if (!(sdata->vif.active_links & 716 BIT(req->tsf_report_link_id))) 717 return -EINVAL; 718 } else { 719 req->tsf_report_link_id = 720 __ffs(sdata->vif.active_links); 721 } 722 } 723 724 if (!__ieee80211_can_leave_ch(sdata)) 725 return -EBUSY; 726 727 if (!ieee80211_can_scan(local, sdata)) { 728 /* wait for the work to finish/time out */ 729 rcu_assign_pointer(local->scan_req, req); 730 rcu_assign_pointer(local->scan_sdata, sdata); 731 return 0; 732 } 733 734 again: 735 if (hw_scan) { 736 u8 *ies; 737 738 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 739 740 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 741 int i, n_bands = 0; 742 u8 bands_counted = 0; 743 744 for (i = 0; i < req->n_channels; i++) { 745 if (bands_counted & BIT(req->channels[i]->band)) 746 continue; 747 bands_counted |= BIT(req->channels[i]->band); 748 n_bands++; 749 } 750 751 local->hw_scan_ies_bufsize *= n_bands; 752 } 753 754 local->hw_scan_req = kmalloc( 755 sizeof(*local->hw_scan_req) + 756 req->n_channels * sizeof(req->channels[0]) + 757 local->hw_scan_ies_bufsize, GFP_KERNEL); 758 if (!local->hw_scan_req) 759 return -ENOMEM; 760 761 local->hw_scan_req->req.ssids = req->ssids; 762 local->hw_scan_req->req.n_ssids = req->n_ssids; 763 ies = (u8 *)local->hw_scan_req + 764 sizeof(*local->hw_scan_req) + 765 req->n_channels * sizeof(req->channels[0]); 766 local->hw_scan_req->req.ie = ies; 767 local->hw_scan_req->req.flags = req->flags; 768 eth_broadcast_addr(local->hw_scan_req->req.bssid); 769 local->hw_scan_req->req.duration = req->duration; 770 local->hw_scan_req->req.duration_mandatory = 771 req->duration_mandatory; 772 local->hw_scan_req->req.tsf_report_link_id = 773 req->tsf_report_link_id; 774 775 local->hw_scan_band = 0; 776 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; 777 local->hw_scan_req->req.scan_6ghz_params = 778 req->scan_6ghz_params; 779 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; 780 781 /* 782 * After allocating local->hw_scan_req, we must 783 * go through until ieee80211_prep_hw_scan(), so 784 * anything that might be changed here and leave 785 * this function early must not go after this 786 * allocation. 787 */ 788 } 789 790 rcu_assign_pointer(local->scan_req, req); 791 rcu_assign_pointer(local->scan_sdata, sdata); 792 793 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 794 get_random_mask_addr(local->scan_addr, 795 req->mac_addr, 796 req->mac_addr_mask); 797 else 798 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 799 800 if (hw_scan) { 801 __set_bit(SCAN_HW_SCANNING, &local->scanning); 802 } else if ((req->n_channels == 1) && 803 (req->channels[0] == local->hw.conf.chandef.chan)) { 804 /* 805 * If we are scanning only on the operating channel 806 * then we do not need to stop normal activities 807 */ 808 unsigned long next_delay; 809 810 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 811 812 ieee80211_recalc_idle(local); 813 814 /* Notify driver scan is starting, keep order of operations 815 * same as normal software scan, in case that matters. */ 816 drv_sw_scan_start(local, sdata, local->scan_addr); 817 818 ieee80211_configure_filter(local); /* accept probe-responses */ 819 820 /* We need to ensure power level is at max for scanning. */ 821 ieee80211_hw_conf_chan(local); 822 823 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 824 IEEE80211_CHAN_RADAR)) || 825 !req->n_ssids) { 826 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 827 if (req->n_ssids) 828 set_bit(SCAN_BEACON_WAIT, &local->scanning); 829 } else { 830 ieee80211_scan_state_send_probe(local, &next_delay); 831 next_delay = IEEE80211_CHANNEL_TIME; 832 } 833 834 /* Now, just wait a bit and we are all done! */ 835 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 836 next_delay); 837 return 0; 838 } else { 839 /* Do normal software scan */ 840 __set_bit(SCAN_SW_SCANNING, &local->scanning); 841 } 842 843 ieee80211_recalc_idle(local); 844 845 if (hw_scan) { 846 WARN_ON(!ieee80211_prep_hw_scan(sdata)); 847 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 848 } else { 849 rc = ieee80211_start_sw_scan(local, sdata); 850 } 851 852 if (rc) { 853 kfree(local->hw_scan_req); 854 local->hw_scan_req = NULL; 855 local->scanning = 0; 856 857 ieee80211_recalc_idle(local); 858 859 local->scan_req = NULL; 860 RCU_INIT_POINTER(local->scan_sdata, NULL); 861 } 862 863 if (hw_scan && rc == 1) { 864 /* 865 * we can't fall back to software for P2P-GO 866 * as it must update NoA etc. 867 */ 868 if (ieee80211_vif_type_p2p(&sdata->vif) == 869 NL80211_IFTYPE_P2P_GO) 870 return -EOPNOTSUPP; 871 hw_scan = false; 872 goto again; 873 } 874 875 return rc; 876 } 877 878 static unsigned long 879 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 880 { 881 /* 882 * TODO: channel switching also consumes quite some time, 883 * add that delay as well to get a better estimation 884 */ 885 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 886 return IEEE80211_PASSIVE_CHANNEL_TIME; 887 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 888 } 889 890 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 891 unsigned long *next_delay) 892 { 893 bool associated = false; 894 bool tx_empty = true; 895 bool bad_latency; 896 struct ieee80211_sub_if_data *sdata; 897 struct ieee80211_channel *next_chan; 898 enum mac80211_scan_state next_scan_state; 899 struct cfg80211_scan_request *scan_req; 900 901 lockdep_assert_wiphy(local->hw.wiphy); 902 903 /* 904 * check if at least one STA interface is associated, 905 * check if at least one STA interface has pending tx frames 906 * and grab the lowest used beacon interval 907 */ 908 list_for_each_entry(sdata, &local->interfaces, list) { 909 if (!ieee80211_sdata_running(sdata)) 910 continue; 911 912 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 913 if (sdata->u.mgd.associated) { 914 associated = true; 915 916 if (!qdisc_all_tx_empty(sdata->dev)) { 917 tx_empty = false; 918 break; 919 } 920 } 921 } 922 } 923 924 scan_req = rcu_dereference_protected(local->scan_req, 925 lockdep_is_held(&local->hw.wiphy->mtx)); 926 927 next_chan = scan_req->channels[local->scan_channel_idx]; 928 929 /* 930 * we're currently scanning a different channel, let's 931 * see if we can scan another channel without interfering 932 * with the current traffic situation. 933 * 934 * Keep good latency, do not stay off-channel more than 125 ms. 935 */ 936 937 bad_latency = time_after(jiffies + 938 ieee80211_scan_get_channel_time(next_chan), 939 local->leave_oper_channel_time + HZ / 8); 940 941 if (associated && !tx_empty) { 942 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 943 next_scan_state = SCAN_ABORT; 944 else 945 next_scan_state = SCAN_SUSPEND; 946 } else if (associated && bad_latency) { 947 next_scan_state = SCAN_SUSPEND; 948 } else { 949 next_scan_state = SCAN_SET_CHANNEL; 950 } 951 952 local->next_scan_state = next_scan_state; 953 954 *next_delay = 0; 955 } 956 957 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 958 unsigned long *next_delay) 959 { 960 int skip; 961 struct ieee80211_channel *chan; 962 struct cfg80211_scan_request *scan_req; 963 964 scan_req = rcu_dereference_protected(local->scan_req, 965 lockdep_is_held(&local->hw.wiphy->mtx)); 966 967 skip = 0; 968 chan = scan_req->channels[local->scan_channel_idx]; 969 970 local->scan_chandef.chan = chan; 971 local->scan_chandef.center_freq1 = chan->center_freq; 972 local->scan_chandef.freq1_offset = chan->freq_offset; 973 local->scan_chandef.center_freq2 = 0; 974 975 /* For scanning on the S1G band, detect the channel width according to 976 * the channel being scanned. 977 */ 978 if (chan->band == NL80211_BAND_S1GHZ) { 979 local->scan_chandef.width = ieee80211_s1g_channel_width(chan); 980 goto set_channel; 981 } 982 983 /* If scanning on oper channel, use whatever channel-type 984 * is currently in use. 985 */ 986 if (chan == local->hw.conf.chandef.chan) 987 local->scan_chandef = local->hw.conf.chandef; 988 else 989 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 990 991 set_channel: 992 if (ieee80211_hw_conf_chan(local)) 993 skip = 1; 994 995 /* advance state machine to next channel/band */ 996 local->scan_channel_idx++; 997 998 if (skip) { 999 /* if we skip this channel return to the decision state */ 1000 local->next_scan_state = SCAN_DECISION; 1001 return; 1002 } 1003 1004 /* 1005 * Probe delay is used to update the NAV, cf. 11.1.3.2.2 1006 * (which unfortunately doesn't say _why_ step a) is done, 1007 * but it waits for the probe delay or until a frame is 1008 * received - and the received frame would update the NAV). 1009 * For now, we do not support waiting until a frame is 1010 * received. 1011 * 1012 * In any case, it is not necessary for a passive scan. 1013 */ 1014 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) || 1015 !scan_req->n_ssids) { 1016 *next_delay = msecs_to_jiffies(scan_req->duration) > 1017 IEEE80211_PASSIVE_CHANNEL_TIME ? 1018 msecs_to_jiffies(scan_req->duration) : 1019 IEEE80211_PASSIVE_CHANNEL_TIME; 1020 local->next_scan_state = SCAN_DECISION; 1021 if (scan_req->n_ssids) 1022 set_bit(SCAN_BEACON_WAIT, &local->scanning); 1023 return; 1024 } 1025 1026 /* active scan, send probes */ 1027 *next_delay = IEEE80211_PROBE_DELAY; 1028 local->next_scan_state = SCAN_SEND_PROBE; 1029 } 1030 1031 static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 1032 unsigned long *next_delay) 1033 { 1034 /* switch back to the operating channel */ 1035 local->scan_chandef.chan = NULL; 1036 ieee80211_hw_conf_chan(local); 1037 1038 /* disable PS */ 1039 ieee80211_offchannel_return(local); 1040 1041 *next_delay = HZ / 5; 1042 /* afterwards, resume scan & go to next channel */ 1043 local->next_scan_state = SCAN_RESUME; 1044 } 1045 1046 static void ieee80211_scan_state_resume(struct ieee80211_local *local, 1047 unsigned long *next_delay) 1048 { 1049 ieee80211_offchannel_stop_vifs(local); 1050 1051 if (local->ops->flush) { 1052 ieee80211_flush_queues(local, NULL, false); 1053 *next_delay = 0; 1054 } else 1055 *next_delay = HZ / 10; 1056 1057 /* remember when we left the operating channel */ 1058 local->leave_oper_channel_time = jiffies; 1059 1060 /* advance to the next channel to be scanned */ 1061 local->next_scan_state = SCAN_SET_CHANNEL; 1062 } 1063 1064 void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) 1065 { 1066 struct ieee80211_local *local = 1067 container_of(work, struct ieee80211_local, scan_work.work); 1068 struct ieee80211_sub_if_data *sdata; 1069 struct cfg80211_scan_request *scan_req; 1070 unsigned long next_delay = 0; 1071 bool aborted; 1072 1073 lockdep_assert_wiphy(local->hw.wiphy); 1074 1075 if (!ieee80211_can_run_worker(local)) { 1076 aborted = true; 1077 goto out_complete; 1078 } 1079 1080 sdata = rcu_dereference_protected(local->scan_sdata, 1081 lockdep_is_held(&local->hw.wiphy->mtx)); 1082 scan_req = rcu_dereference_protected(local->scan_req, 1083 lockdep_is_held(&local->hw.wiphy->mtx)); 1084 1085 /* When scanning on-channel, the first-callback means completed. */ 1086 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 1087 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1088 goto out_complete; 1089 } 1090 1091 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 1092 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1093 goto out_complete; 1094 } 1095 1096 if (!sdata || !scan_req) 1097 return; 1098 1099 if (!local->scanning) { 1100 int rc; 1101 1102 RCU_INIT_POINTER(local->scan_req, NULL); 1103 RCU_INIT_POINTER(local->scan_sdata, NULL); 1104 1105 rc = __ieee80211_start_scan(sdata, scan_req); 1106 if (!rc) 1107 return; 1108 /* need to complete scan in cfg80211 */ 1109 rcu_assign_pointer(local->scan_req, scan_req); 1110 aborted = true; 1111 goto out_complete; 1112 } 1113 1114 clear_bit(SCAN_BEACON_WAIT, &local->scanning); 1115 1116 /* 1117 * as long as no delay is required advance immediately 1118 * without scheduling a new work 1119 */ 1120 do { 1121 if (!ieee80211_sdata_running(sdata)) { 1122 aborted = true; 1123 goto out_complete; 1124 } 1125 1126 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) && 1127 local->next_scan_state == SCAN_DECISION) 1128 local->next_scan_state = SCAN_SEND_PROBE; 1129 1130 switch (local->next_scan_state) { 1131 case SCAN_DECISION: 1132 /* if no more bands/channels left, complete scan */ 1133 if (local->scan_channel_idx >= scan_req->n_channels) { 1134 aborted = false; 1135 goto out_complete; 1136 } 1137 ieee80211_scan_state_decision(local, &next_delay); 1138 break; 1139 case SCAN_SET_CHANNEL: 1140 ieee80211_scan_state_set_channel(local, &next_delay); 1141 break; 1142 case SCAN_SEND_PROBE: 1143 ieee80211_scan_state_send_probe(local, &next_delay); 1144 break; 1145 case SCAN_SUSPEND: 1146 ieee80211_scan_state_suspend(local, &next_delay); 1147 break; 1148 case SCAN_RESUME: 1149 ieee80211_scan_state_resume(local, &next_delay); 1150 break; 1151 case SCAN_ABORT: 1152 aborted = true; 1153 goto out_complete; 1154 } 1155 } while (next_delay == 0); 1156 1157 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 1158 next_delay); 1159 return; 1160 1161 out_complete: 1162 __ieee80211_scan_completed(&local->hw, aborted); 1163 } 1164 1165 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1166 struct cfg80211_scan_request *req) 1167 { 1168 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1169 1170 return __ieee80211_start_scan(sdata, req); 1171 } 1172 1173 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1174 const u8 *ssid, u8 ssid_len, 1175 struct ieee80211_channel **channels, 1176 unsigned int n_channels) 1177 { 1178 struct ieee80211_local *local = sdata->local; 1179 int ret = -EBUSY, i, n_ch = 0; 1180 enum nl80211_band band; 1181 1182 lockdep_assert_wiphy(local->hw.wiphy); 1183 1184 /* busy scanning */ 1185 if (local->scan_req) 1186 goto unlock; 1187 1188 /* fill internal scan request */ 1189 if (!channels) { 1190 int max_n; 1191 1192 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1193 if (!local->hw.wiphy->bands[band] || 1194 band == NL80211_BAND_6GHZ) 1195 continue; 1196 1197 max_n = local->hw.wiphy->bands[band]->n_channels; 1198 for (i = 0; i < max_n; i++) { 1199 struct ieee80211_channel *tmp_ch = 1200 &local->hw.wiphy->bands[band]->channels[i]; 1201 1202 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1203 IEEE80211_CHAN_DISABLED)) 1204 continue; 1205 1206 local->int_scan_req->channels[n_ch] = tmp_ch; 1207 n_ch++; 1208 } 1209 } 1210 1211 if (WARN_ON_ONCE(n_ch == 0)) 1212 goto unlock; 1213 1214 local->int_scan_req->n_channels = n_ch; 1215 } else { 1216 for (i = 0; i < n_channels; i++) { 1217 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1218 IEEE80211_CHAN_DISABLED)) 1219 continue; 1220 1221 local->int_scan_req->channels[n_ch] = channels[i]; 1222 n_ch++; 1223 } 1224 1225 if (WARN_ON_ONCE(n_ch == 0)) 1226 goto unlock; 1227 1228 local->int_scan_req->n_channels = n_ch; 1229 } 1230 1231 local->int_scan_req->ssids = &local->scan_ssid; 1232 local->int_scan_req->n_ssids = 1; 1233 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1234 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1235 1236 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1237 unlock: 1238 return ret; 1239 } 1240 1241 void ieee80211_scan_cancel(struct ieee80211_local *local) 1242 { 1243 /* ensure a new scan cannot be queued */ 1244 lockdep_assert_wiphy(local->hw.wiphy); 1245 1246 /* 1247 * We are canceling software scan, or deferred scan that was not 1248 * yet really started (see __ieee80211_start_scan ). 1249 * 1250 * Regarding hardware scan: 1251 * - we can not call __ieee80211_scan_completed() as when 1252 * SCAN_HW_SCANNING bit is set this function change 1253 * local->hw_scan_req to operate on 5G band, what race with 1254 * driver which can use local->hw_scan_req 1255 * 1256 * - we can not cancel scan_work since driver can schedule it 1257 * by ieee80211_scan_completed(..., true) to finish scan 1258 * 1259 * Hence we only call the cancel_hw_scan() callback, but the low-level 1260 * driver is still responsible for calling ieee80211_scan_completed() 1261 * after the scan was completed/aborted. 1262 */ 1263 1264 if (!local->scan_req) 1265 return; 1266 1267 /* 1268 * We have a scan running and the driver already reported completion, 1269 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1270 * cancelled. 1271 */ 1272 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1273 test_bit(SCAN_COMPLETED, &local->scanning)) { 1274 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1275 return; 1276 } 1277 1278 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1279 /* 1280 * Make sure that __ieee80211_scan_completed doesn't trigger a 1281 * scan on another band. 1282 */ 1283 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1284 if (local->ops->cancel_hw_scan) 1285 drv_cancel_hw_scan(local, 1286 rcu_dereference_protected(local->scan_sdata, 1287 lockdep_is_held(&local->hw.wiphy->mtx))); 1288 return; 1289 } 1290 1291 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work); 1292 /* and clean up */ 1293 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1294 __ieee80211_scan_completed(&local->hw, true); 1295 } 1296 1297 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1298 struct cfg80211_sched_scan_request *req) 1299 { 1300 struct ieee80211_local *local = sdata->local; 1301 struct ieee80211_scan_ies sched_scan_ies = {}; 1302 struct cfg80211_chan_def chandef; 1303 int ret, i, iebufsz, num_bands = 0; 1304 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1305 u8 bands_used = 0; 1306 u8 *ie; 1307 u32 flags = 0; 1308 1309 lockdep_assert_wiphy(local->hw.wiphy); 1310 1311 iebufsz = local->scan_ies_len + req->ie_len; 1312 1313 if (!local->ops->sched_scan_start) 1314 return -EOPNOTSUPP; 1315 1316 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1317 if (local->hw.wiphy->bands[i]) { 1318 bands_used |= BIT(i); 1319 rate_masks[i] = (u32) -1; 1320 num_bands++; 1321 } 1322 } 1323 1324 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1325 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1326 1327 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1328 if (!ie) { 1329 ret = -ENOMEM; 1330 goto out; 1331 } 1332 1333 ieee80211_prepare_scan_chandef(&chandef); 1334 1335 ret = ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, 1336 &sched_scan_ies, req->ie, 1337 req->ie_len, bands_used, rate_masks, 1338 &chandef, flags); 1339 if (ret < 0) 1340 goto error; 1341 1342 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1343 if (ret == 0) { 1344 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1345 rcu_assign_pointer(local->sched_scan_req, req); 1346 } 1347 1348 error: 1349 kfree(ie); 1350 out: 1351 if (ret) { 1352 /* Clean in case of failure after HW restart or upon resume. */ 1353 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1354 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1355 } 1356 1357 return ret; 1358 } 1359 1360 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1361 struct cfg80211_sched_scan_request *req) 1362 { 1363 struct ieee80211_local *local = sdata->local; 1364 1365 lockdep_assert_wiphy(local->hw.wiphy); 1366 1367 if (rcu_access_pointer(local->sched_scan_sdata)) 1368 return -EBUSY; 1369 1370 return __ieee80211_request_sched_scan_start(sdata, req); 1371 } 1372 1373 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1374 { 1375 struct ieee80211_sub_if_data *sched_scan_sdata; 1376 int ret = -ENOENT; 1377 1378 lockdep_assert_wiphy(local->hw.wiphy); 1379 1380 if (!local->ops->sched_scan_stop) 1381 return -EOPNOTSUPP; 1382 1383 /* We don't want to restart sched scan anymore. */ 1384 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1385 1386 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata, 1387 lockdep_is_held(&local->hw.wiphy->mtx)); 1388 if (sched_scan_sdata) { 1389 ret = drv_sched_scan_stop(local, sched_scan_sdata); 1390 if (!ret) 1391 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1392 } 1393 1394 return ret; 1395 } 1396 1397 void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1398 { 1399 struct ieee80211_local *local = hw_to_local(hw); 1400 1401 trace_api_sched_scan_results(local); 1402 1403 cfg80211_sched_scan_results(hw->wiphy, 0); 1404 } 1405 EXPORT_SYMBOL(ieee80211_sched_scan_results); 1406 1407 void ieee80211_sched_scan_end(struct ieee80211_local *local) 1408 { 1409 lockdep_assert_wiphy(local->hw.wiphy); 1410 1411 if (!rcu_access_pointer(local->sched_scan_sdata)) 1412 return; 1413 1414 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1415 1416 /* If sched scan was aborted by the driver. */ 1417 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1418 1419 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0); 1420 } 1421 1422 void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, 1423 struct wiphy_work *work) 1424 { 1425 struct ieee80211_local *local = 1426 container_of(work, struct ieee80211_local, 1427 sched_scan_stopped_work); 1428 1429 ieee80211_sched_scan_end(local); 1430 } 1431 1432 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1433 { 1434 struct ieee80211_local *local = hw_to_local(hw); 1435 1436 trace_api_sched_scan_stopped(local); 1437 1438 /* 1439 * this shouldn't really happen, so for simplicity 1440 * simply ignore it, and let mac80211 reconfigure 1441 * the sched scan later on. 1442 */ 1443 if (local->in_reconfig) 1444 return; 1445 1446 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work); 1447 } 1448 EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1449