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.scan_width = NL80211_BSS_CHAN_WIDTH_20; 191 if (rx_status->bw == RATE_INFO_BW_5) 192 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5; 193 else if (rx_status->bw == RATE_INFO_BW_10) 194 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10; 195 196 bss_meta.chan = channel; 197 198 rcu_read_lock(); 199 scan_sdata = rcu_dereference(local->scan_sdata); 200 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION && 201 scan_sdata->vif.cfg.assoc && 202 ieee80211_have_rx_timestamp(rx_status)) { 203 bss_meta.parent_tsf = 204 ieee80211_calculate_rx_timestamp(local, rx_status, 205 len + FCS_LEN, 24); 206 ether_addr_copy(bss_meta.parent_bssid, 207 scan_sdata->vif.bss_conf.bssid); 208 } 209 rcu_read_unlock(); 210 211 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, 212 mgmt, len, GFP_ATOMIC); 213 if (!cbss) 214 return NULL; 215 216 /* In case the signal is invalid update the status */ 217 signal_valid = channel == cbss->channel; 218 if (!signal_valid) 219 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL; 220 221 return (void *)cbss->priv; 222 } 223 224 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata, 225 u32 scan_flags, const u8 *da) 226 { 227 if (!sdata) 228 return false; 229 /* accept broadcast for OCE */ 230 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP && 231 is_broadcast_ether_addr(da)) 232 return true; 233 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 234 return true; 235 return ether_addr_equal(da, sdata->vif.addr); 236 } 237 238 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) 239 { 240 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 241 struct ieee80211_sub_if_data *sdata1, *sdata2; 242 struct ieee80211_mgmt *mgmt = (void *)skb->data; 243 struct ieee80211_bss *bss; 244 struct ieee80211_channel *channel; 245 size_t min_hdr_len = offsetof(struct ieee80211_mgmt, 246 u.probe_resp.variable); 247 248 if (!ieee80211_is_probe_resp(mgmt->frame_control) && 249 !ieee80211_is_beacon(mgmt->frame_control) && 250 !ieee80211_is_s1g_beacon(mgmt->frame_control)) 251 return; 252 253 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { 254 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) 255 min_hdr_len = offsetof(struct ieee80211_ext, 256 u.s1g_short_beacon.variable); 257 else 258 min_hdr_len = offsetof(struct ieee80211_ext, 259 u.s1g_beacon); 260 } 261 262 if (skb->len < min_hdr_len) 263 return; 264 265 sdata1 = rcu_dereference(local->scan_sdata); 266 sdata2 = rcu_dereference(local->sched_scan_sdata); 267 268 if (likely(!sdata1 && !sdata2)) 269 return; 270 271 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) { 272 /* 273 * we were passive scanning because of radar/no-IR, but 274 * the beacon/proberesp rx gives us an opportunity to upgrade 275 * to active scan 276 */ 277 set_bit(SCAN_BEACON_DONE, &local->scanning); 278 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 279 } 280 281 if (ieee80211_is_probe_resp(mgmt->frame_control)) { 282 struct cfg80211_scan_request *scan_req; 283 struct cfg80211_sched_scan_request *sched_scan_req; 284 u32 scan_req_flags = 0, sched_scan_req_flags = 0; 285 286 scan_req = rcu_dereference(local->scan_req); 287 sched_scan_req = rcu_dereference(local->sched_scan_req); 288 289 if (scan_req) 290 scan_req_flags = scan_req->flags; 291 292 if (sched_scan_req) 293 sched_scan_req_flags = sched_scan_req->flags; 294 295 /* ignore ProbeResp to foreign address or non-bcast (OCE) 296 * unless scanning with randomised address 297 */ 298 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags, 299 mgmt->da) && 300 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags, 301 mgmt->da)) 302 return; 303 } 304 305 channel = ieee80211_get_channel_khz(local->hw.wiphy, 306 ieee80211_rx_status_to_khz(rx_status)); 307 308 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 309 return; 310 311 bss = ieee80211_bss_info_update(local, rx_status, 312 mgmt, skb->len, 313 channel); 314 if (bss) 315 ieee80211_rx_bss_put(local, bss); 316 } 317 318 static void 319 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef, 320 enum nl80211_bss_scan_width scan_width) 321 { 322 memset(chandef, 0, sizeof(*chandef)); 323 switch (scan_width) { 324 case NL80211_BSS_CHAN_WIDTH_5: 325 chandef->width = NL80211_CHAN_WIDTH_5; 326 break; 327 case NL80211_BSS_CHAN_WIDTH_10: 328 chandef->width = NL80211_CHAN_WIDTH_10; 329 break; 330 default: 331 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 332 break; 333 } 334 } 335 336 /* return false if no more work */ 337 static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) 338 { 339 struct ieee80211_local *local = sdata->local; 340 struct cfg80211_scan_request *req; 341 struct cfg80211_chan_def chandef; 342 u8 bands_used = 0; 343 int i, ielen, n_chans; 344 u32 flags = 0; 345 346 req = rcu_dereference_protected(local->scan_req, 347 lockdep_is_held(&local->mtx)); 348 349 if (test_bit(SCAN_HW_CANCELLED, &local->scanning)) 350 return false; 351 352 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 353 for (i = 0; i < req->n_channels; i++) { 354 local->hw_scan_req->req.channels[i] = req->channels[i]; 355 bands_used |= BIT(req->channels[i]->band); 356 } 357 358 n_chans = req->n_channels; 359 } else { 360 do { 361 if (local->hw_scan_band == NUM_NL80211_BANDS) 362 return false; 363 364 n_chans = 0; 365 366 for (i = 0; i < req->n_channels; i++) { 367 if (req->channels[i]->band != 368 local->hw_scan_band) 369 continue; 370 local->hw_scan_req->req.channels[n_chans] = 371 req->channels[i]; 372 n_chans++; 373 bands_used |= BIT(req->channels[i]->band); 374 } 375 376 local->hw_scan_band++; 377 } while (!n_chans); 378 } 379 380 local->hw_scan_req->req.n_channels = n_chans; 381 ieee80211_prepare_scan_chandef(&chandef, req->scan_width); 382 383 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 384 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 385 386 ielen = ieee80211_build_preq_ies(sdata, 387 (u8 *)local->hw_scan_req->req.ie, 388 local->hw_scan_ies_bufsize, 389 &local->hw_scan_req->ies, 390 req->ie, req->ie_len, 391 bands_used, req->rates, &chandef, 392 flags); 393 local->hw_scan_req->req.ie_len = ielen; 394 local->hw_scan_req->req.no_cck = req->no_cck; 395 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr); 396 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask, 397 req->mac_addr_mask); 398 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid); 399 400 return true; 401 } 402 403 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 404 { 405 struct ieee80211_local *local = hw_to_local(hw); 406 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 407 bool was_scanning = local->scanning; 408 struct cfg80211_scan_request *scan_req; 409 struct ieee80211_sub_if_data *scan_sdata; 410 struct ieee80211_sub_if_data *sdata; 411 412 lockdep_assert_held(&local->mtx); 413 414 /* 415 * It's ok to abort a not-yet-running scan (that 416 * we have one at all will be verified by checking 417 * local->scan_req next), but not to complete it 418 * successfully. 419 */ 420 if (WARN_ON(!local->scanning && !aborted)) 421 aborted = true; 422 423 if (WARN_ON(!local->scan_req)) 424 return; 425 426 scan_sdata = rcu_dereference_protected(local->scan_sdata, 427 lockdep_is_held(&local->mtx)); 428 429 if (hw_scan && !aborted && 430 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) && 431 ieee80211_prep_hw_scan(scan_sdata)) { 432 int rc; 433 434 rc = drv_hw_scan(local, 435 rcu_dereference_protected(local->scan_sdata, 436 lockdep_is_held(&local->mtx)), 437 local->hw_scan_req); 438 439 if (rc == 0) 440 return; 441 442 /* HW scan failed and is going to be reported as aborted, 443 * so clear old scan info. 444 */ 445 memset(&local->scan_info, 0, sizeof(local->scan_info)); 446 aborted = true; 447 } 448 449 kfree(local->hw_scan_req); 450 local->hw_scan_req = NULL; 451 452 scan_req = rcu_dereference_protected(local->scan_req, 453 lockdep_is_held(&local->mtx)); 454 455 RCU_INIT_POINTER(local->scan_req, NULL); 456 RCU_INIT_POINTER(local->scan_sdata, NULL); 457 458 local->scanning = 0; 459 local->scan_chandef.chan = NULL; 460 461 synchronize_rcu(); 462 463 if (scan_req != local->int_scan_req) { 464 local->scan_info.aborted = aborted; 465 cfg80211_scan_done(scan_req, &local->scan_info); 466 } 467 468 /* Set power back to normal operating levels. */ 469 ieee80211_hw_config(local, 0); 470 471 if (!hw_scan && was_scanning) { 472 ieee80211_configure_filter(local); 473 drv_sw_scan_complete(local, scan_sdata); 474 ieee80211_offchannel_return(local); 475 } 476 477 ieee80211_recalc_idle(local); 478 479 ieee80211_mlme_notify_scan_completed(local); 480 ieee80211_ibss_notify_scan_completed(local); 481 482 /* Requeue all the work that might have been ignored while 483 * the scan was in progress; if there was none this will 484 * just be a no-op for the particular interface. 485 */ 486 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 487 if (ieee80211_sdata_running(sdata)) 488 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 489 } 490 491 if (was_scanning) 492 ieee80211_start_next_roc(local); 493 } 494 495 void ieee80211_scan_completed(struct ieee80211_hw *hw, 496 struct cfg80211_scan_info *info) 497 { 498 struct ieee80211_local *local = hw_to_local(hw); 499 500 trace_api_scan_completed(local, info->aborted); 501 502 set_bit(SCAN_COMPLETED, &local->scanning); 503 if (info->aborted) 504 set_bit(SCAN_ABORTED, &local->scanning); 505 506 memcpy(&local->scan_info, info, sizeof(*info)); 507 508 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 509 } 510 EXPORT_SYMBOL(ieee80211_scan_completed); 511 512 static int ieee80211_start_sw_scan(struct ieee80211_local *local, 513 struct ieee80211_sub_if_data *sdata) 514 { 515 /* Software scan is not supported in multi-channel cases */ 516 if (local->use_chanctx) 517 return -EOPNOTSUPP; 518 519 /* 520 * Hardware/driver doesn't support hw_scan, so use software 521 * scanning instead. First send a nullfunc frame with power save 522 * bit on so that AP will buffer the frames for us while we are not 523 * listening, then send probe requests to each channel and wait for 524 * the responses. After all channels are scanned, tune back to the 525 * original channel and send a nullfunc frame with power save bit 526 * off to trigger the AP to send us all the buffered frames. 527 * 528 * Note that while local->sw_scanning is true everything else but 529 * nullfunc frames and probe requests will be dropped in 530 * ieee80211_tx_h_check_assoc(). 531 */ 532 drv_sw_scan_start(local, sdata, local->scan_addr); 533 534 local->leave_oper_channel_time = jiffies; 535 local->next_scan_state = SCAN_DECISION; 536 local->scan_channel_idx = 0; 537 538 ieee80211_offchannel_stop_vifs(local); 539 540 /* ensure nullfunc is transmitted before leaving operating channel */ 541 ieee80211_flush_queues(local, NULL, false); 542 543 ieee80211_configure_filter(local); 544 545 /* We need to set power level at maximum rate for scanning. */ 546 ieee80211_hw_config(local, 0); 547 548 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0); 549 550 return 0; 551 } 552 553 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata) 554 { 555 struct ieee80211_local *local = sdata->local; 556 struct ieee80211_sub_if_data *sdata_iter; 557 558 if (!ieee80211_is_radar_required(local)) 559 return true; 560 561 if (!regulatory_pre_cac_allowed(local->hw.wiphy)) 562 return false; 563 564 mutex_lock(&local->iflist_mtx); 565 list_for_each_entry(sdata_iter, &local->interfaces, list) { 566 if (sdata_iter->wdev.cac_started) { 567 mutex_unlock(&local->iflist_mtx); 568 return false; 569 } 570 } 571 mutex_unlock(&local->iflist_mtx); 572 573 return true; 574 } 575 576 static bool ieee80211_can_scan(struct ieee80211_local *local, 577 struct ieee80211_sub_if_data *sdata) 578 { 579 if (!__ieee80211_can_leave_ch(sdata)) 580 return false; 581 582 if (!list_empty(&local->roc_list)) 583 return false; 584 585 if (sdata->vif.type == NL80211_IFTYPE_STATION && 586 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL) 587 return false; 588 589 return true; 590 } 591 592 void ieee80211_run_deferred_scan(struct ieee80211_local *local) 593 { 594 lockdep_assert_held(&local->mtx); 595 596 if (!local->scan_req || local->scanning) 597 return; 598 599 if (!ieee80211_can_scan(local, 600 rcu_dereference_protected( 601 local->scan_sdata, 602 lockdep_is_held(&local->mtx)))) 603 return; 604 605 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 606 round_jiffies_relative(0)); 607 } 608 609 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata, 610 const u8 *src, const u8 *dst, 611 const u8 *ssid, size_t ssid_len, 612 const u8 *ie, size_t ie_len, 613 u32 ratemask, u32 flags, u32 tx_flags, 614 struct ieee80211_channel *channel) 615 { 616 struct sk_buff *skb; 617 618 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel, 619 ssid, ssid_len, 620 ie, ie_len, flags); 621 622 if (skb) { 623 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) { 624 struct ieee80211_hdr *hdr = (void *)skb->data; 625 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 626 u16 sn = get_random_u16(); 627 628 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 629 hdr->seq_ctrl = 630 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn)); 631 } 632 IEEE80211_SKB_CB(skb)->flags |= tx_flags; 633 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band); 634 } 635 } 636 637 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 638 unsigned long *next_delay) 639 { 640 int i; 641 struct ieee80211_sub_if_data *sdata; 642 struct cfg80211_scan_request *scan_req; 643 enum nl80211_band band = local->hw.conf.chandef.chan->band; 644 u32 flags = 0, tx_flags; 645 646 scan_req = rcu_dereference_protected(local->scan_req, 647 lockdep_is_held(&local->mtx)); 648 649 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 650 if (scan_req->no_cck) 651 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 652 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 653 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 654 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN) 655 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN; 656 657 sdata = rcu_dereference_protected(local->scan_sdata, 658 lockdep_is_held(&local->mtx)); 659 660 for (i = 0; i < scan_req->n_ssids; i++) 661 ieee80211_send_scan_probe_req( 662 sdata, local->scan_addr, scan_req->bssid, 663 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len, 664 scan_req->ie, scan_req->ie_len, 665 scan_req->rates[band], flags, 666 tx_flags, local->hw.conf.chandef.chan); 667 668 /* 669 * After sending probe requests, wait for probe responses 670 * on the channel. 671 */ 672 *next_delay = IEEE80211_CHANNEL_TIME; 673 local->next_scan_state = SCAN_DECISION; 674 } 675 676 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 677 struct cfg80211_scan_request *req) 678 { 679 struct ieee80211_local *local = sdata->local; 680 bool hw_scan = local->ops->hw_scan; 681 int rc; 682 683 lockdep_assert_held(&local->mtx); 684 685 if (local->scan_req) 686 return -EBUSY; 687 688 if (!__ieee80211_can_leave_ch(sdata)) 689 return -EBUSY; 690 691 if (!ieee80211_can_scan(local, sdata)) { 692 /* wait for the work to finish/time out */ 693 rcu_assign_pointer(local->scan_req, req); 694 rcu_assign_pointer(local->scan_sdata, sdata); 695 return 0; 696 } 697 698 again: 699 if (hw_scan) { 700 u8 *ies; 701 702 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len; 703 704 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { 705 int i, n_bands = 0; 706 u8 bands_counted = 0; 707 708 for (i = 0; i < req->n_channels; i++) { 709 if (bands_counted & BIT(req->channels[i]->band)) 710 continue; 711 bands_counted |= BIT(req->channels[i]->band); 712 n_bands++; 713 } 714 715 local->hw_scan_ies_bufsize *= n_bands; 716 } 717 718 local->hw_scan_req = kmalloc( 719 sizeof(*local->hw_scan_req) + 720 req->n_channels * sizeof(req->channels[0]) + 721 local->hw_scan_ies_bufsize, GFP_KERNEL); 722 if (!local->hw_scan_req) 723 return -ENOMEM; 724 725 local->hw_scan_req->req.ssids = req->ssids; 726 local->hw_scan_req->req.n_ssids = req->n_ssids; 727 ies = (u8 *)local->hw_scan_req + 728 sizeof(*local->hw_scan_req) + 729 req->n_channels * sizeof(req->channels[0]); 730 local->hw_scan_req->req.ie = ies; 731 local->hw_scan_req->req.flags = req->flags; 732 eth_broadcast_addr(local->hw_scan_req->req.bssid); 733 local->hw_scan_req->req.duration = req->duration; 734 local->hw_scan_req->req.duration_mandatory = 735 req->duration_mandatory; 736 737 local->hw_scan_band = 0; 738 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params; 739 local->hw_scan_req->req.scan_6ghz_params = 740 req->scan_6ghz_params; 741 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz; 742 743 /* 744 * After allocating local->hw_scan_req, we must 745 * go through until ieee80211_prep_hw_scan(), so 746 * anything that might be changed here and leave 747 * this function early must not go after this 748 * allocation. 749 */ 750 } 751 752 rcu_assign_pointer(local->scan_req, req); 753 rcu_assign_pointer(local->scan_sdata, sdata); 754 755 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) 756 get_random_mask_addr(local->scan_addr, 757 req->mac_addr, 758 req->mac_addr_mask); 759 else 760 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN); 761 762 if (hw_scan) { 763 __set_bit(SCAN_HW_SCANNING, &local->scanning); 764 } else if ((req->n_channels == 1) && 765 (req->channels[0] == local->_oper_chandef.chan)) { 766 /* 767 * If we are scanning only on the operating channel 768 * then we do not need to stop normal activities 769 */ 770 unsigned long next_delay; 771 772 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); 773 774 ieee80211_recalc_idle(local); 775 776 /* Notify driver scan is starting, keep order of operations 777 * same as normal software scan, in case that matters. */ 778 drv_sw_scan_start(local, sdata, local->scan_addr); 779 780 ieee80211_configure_filter(local); /* accept probe-responses */ 781 782 /* We need to ensure power level is at max for scanning. */ 783 ieee80211_hw_config(local, 0); 784 785 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR | 786 IEEE80211_CHAN_RADAR)) || 787 !req->n_ssids) { 788 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 789 if (req->n_ssids) 790 set_bit(SCAN_BEACON_WAIT, &local->scanning); 791 } else { 792 ieee80211_scan_state_send_probe(local, &next_delay); 793 next_delay = IEEE80211_CHANNEL_TIME; 794 } 795 796 /* Now, just wait a bit and we are all done! */ 797 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 798 next_delay); 799 return 0; 800 } else { 801 /* Do normal software scan */ 802 __set_bit(SCAN_SW_SCANNING, &local->scanning); 803 } 804 805 ieee80211_recalc_idle(local); 806 807 if (hw_scan) { 808 WARN_ON(!ieee80211_prep_hw_scan(sdata)); 809 rc = drv_hw_scan(local, sdata, local->hw_scan_req); 810 } else { 811 rc = ieee80211_start_sw_scan(local, sdata); 812 } 813 814 if (rc) { 815 kfree(local->hw_scan_req); 816 local->hw_scan_req = NULL; 817 local->scanning = 0; 818 819 ieee80211_recalc_idle(local); 820 821 local->scan_req = NULL; 822 RCU_INIT_POINTER(local->scan_sdata, NULL); 823 } 824 825 if (hw_scan && rc == 1) { 826 /* 827 * we can't fall back to software for P2P-GO 828 * as it must update NoA etc. 829 */ 830 if (ieee80211_vif_type_p2p(&sdata->vif) == 831 NL80211_IFTYPE_P2P_GO) 832 return -EOPNOTSUPP; 833 hw_scan = false; 834 goto again; 835 } 836 837 return rc; 838 } 839 840 static unsigned long 841 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) 842 { 843 /* 844 * TODO: channel switching also consumes quite some time, 845 * add that delay as well to get a better estimation 846 */ 847 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 848 return IEEE80211_PASSIVE_CHANNEL_TIME; 849 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; 850 } 851 852 static void ieee80211_scan_state_decision(struct ieee80211_local *local, 853 unsigned long *next_delay) 854 { 855 bool associated = false; 856 bool tx_empty = true; 857 bool bad_latency; 858 struct ieee80211_sub_if_data *sdata; 859 struct ieee80211_channel *next_chan; 860 enum mac80211_scan_state next_scan_state; 861 struct cfg80211_scan_request *scan_req; 862 863 /* 864 * check if at least one STA interface is associated, 865 * check if at least one STA interface has pending tx frames 866 * and grab the lowest used beacon interval 867 */ 868 mutex_lock(&local->iflist_mtx); 869 list_for_each_entry(sdata, &local->interfaces, list) { 870 if (!ieee80211_sdata_running(sdata)) 871 continue; 872 873 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 874 if (sdata->u.mgd.associated) { 875 associated = true; 876 877 if (!qdisc_all_tx_empty(sdata->dev)) { 878 tx_empty = false; 879 break; 880 } 881 } 882 } 883 } 884 mutex_unlock(&local->iflist_mtx); 885 886 scan_req = rcu_dereference_protected(local->scan_req, 887 lockdep_is_held(&local->mtx)); 888 889 next_chan = scan_req->channels[local->scan_channel_idx]; 890 891 /* 892 * we're currently scanning a different channel, let's 893 * see if we can scan another channel without interfering 894 * with the current traffic situation. 895 * 896 * Keep good latency, do not stay off-channel more than 125 ms. 897 */ 898 899 bad_latency = time_after(jiffies + 900 ieee80211_scan_get_channel_time(next_chan), 901 local->leave_oper_channel_time + HZ / 8); 902 903 if (associated && !tx_empty) { 904 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) 905 next_scan_state = SCAN_ABORT; 906 else 907 next_scan_state = SCAN_SUSPEND; 908 } else if (associated && bad_latency) { 909 next_scan_state = SCAN_SUSPEND; 910 } else { 911 next_scan_state = SCAN_SET_CHANNEL; 912 } 913 914 local->next_scan_state = next_scan_state; 915 916 *next_delay = 0; 917 } 918 919 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 920 unsigned long *next_delay) 921 { 922 int skip; 923 struct ieee80211_channel *chan; 924 enum nl80211_bss_scan_width oper_scan_width; 925 struct cfg80211_scan_request *scan_req; 926 927 scan_req = rcu_dereference_protected(local->scan_req, 928 lockdep_is_held(&local->mtx)); 929 930 skip = 0; 931 chan = scan_req->channels[local->scan_channel_idx]; 932 933 local->scan_chandef.chan = chan; 934 local->scan_chandef.center_freq1 = chan->center_freq; 935 local->scan_chandef.freq1_offset = chan->freq_offset; 936 local->scan_chandef.center_freq2 = 0; 937 938 /* For scanning on the S1G band, ignore scan_width (which is constant 939 * across all channels) for now since channel width is specific to each 940 * channel. Detect the required channel width here and likely revisit 941 * later. Maybe scan_width could be used to build the channel scan list? 942 */ 943 if (chan->band == NL80211_BAND_S1GHZ) { 944 local->scan_chandef.width = ieee80211_s1g_channel_width(chan); 945 goto set_channel; 946 } 947 948 switch (scan_req->scan_width) { 949 case NL80211_BSS_CHAN_WIDTH_5: 950 local->scan_chandef.width = NL80211_CHAN_WIDTH_5; 951 break; 952 case NL80211_BSS_CHAN_WIDTH_10: 953 local->scan_chandef.width = NL80211_CHAN_WIDTH_10; 954 break; 955 default: 956 case NL80211_BSS_CHAN_WIDTH_20: 957 /* If scanning on oper channel, use whatever channel-type 958 * is currently in use. 959 */ 960 oper_scan_width = cfg80211_chandef_to_scan_width( 961 &local->_oper_chandef); 962 if (chan == local->_oper_chandef.chan && 963 oper_scan_width == scan_req->scan_width) 964 local->scan_chandef = local->_oper_chandef; 965 else 966 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT; 967 break; 968 case NL80211_BSS_CHAN_WIDTH_1: 969 case NL80211_BSS_CHAN_WIDTH_2: 970 /* shouldn't get here, S1G handled above */ 971 WARN_ON(1); 972 break; 973 } 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 = IEEE80211_PASSIVE_CHANNEL_TIME; 1001 local->next_scan_state = SCAN_DECISION; 1002 if (scan_req->n_ssids) 1003 set_bit(SCAN_BEACON_WAIT, &local->scanning); 1004 return; 1005 } 1006 1007 /* active scan, send probes */ 1008 *next_delay = IEEE80211_PROBE_DELAY; 1009 local->next_scan_state = SCAN_SEND_PROBE; 1010 } 1011 1012 static void ieee80211_scan_state_suspend(struct ieee80211_local *local, 1013 unsigned long *next_delay) 1014 { 1015 /* switch back to the operating channel */ 1016 local->scan_chandef.chan = NULL; 1017 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 1018 1019 /* disable PS */ 1020 ieee80211_offchannel_return(local); 1021 1022 *next_delay = HZ / 5; 1023 /* afterwards, resume scan & go to next channel */ 1024 local->next_scan_state = SCAN_RESUME; 1025 } 1026 1027 static void ieee80211_scan_state_resume(struct ieee80211_local *local, 1028 unsigned long *next_delay) 1029 { 1030 ieee80211_offchannel_stop_vifs(local); 1031 1032 if (local->ops->flush) { 1033 ieee80211_flush_queues(local, NULL, false); 1034 *next_delay = 0; 1035 } else 1036 *next_delay = HZ / 10; 1037 1038 /* remember when we left the operating channel */ 1039 local->leave_oper_channel_time = jiffies; 1040 1041 /* advance to the next channel to be scanned */ 1042 local->next_scan_state = SCAN_SET_CHANNEL; 1043 } 1044 1045 void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work) 1046 { 1047 struct ieee80211_local *local = 1048 container_of(work, struct ieee80211_local, scan_work.work); 1049 struct ieee80211_sub_if_data *sdata; 1050 struct cfg80211_scan_request *scan_req; 1051 unsigned long next_delay = 0; 1052 bool aborted; 1053 1054 mutex_lock(&local->mtx); 1055 1056 if (!ieee80211_can_run_worker(local)) { 1057 aborted = true; 1058 goto out_complete; 1059 } 1060 1061 sdata = rcu_dereference_protected(local->scan_sdata, 1062 lockdep_is_held(&local->mtx)); 1063 scan_req = rcu_dereference_protected(local->scan_req, 1064 lockdep_is_held(&local->mtx)); 1065 1066 /* When scanning on-channel, the first-callback means completed. */ 1067 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { 1068 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1069 goto out_complete; 1070 } 1071 1072 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { 1073 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); 1074 goto out_complete; 1075 } 1076 1077 if (!sdata || !scan_req) 1078 goto out; 1079 1080 if (!local->scanning) { 1081 int rc; 1082 1083 RCU_INIT_POINTER(local->scan_req, NULL); 1084 RCU_INIT_POINTER(local->scan_sdata, NULL); 1085 1086 rc = __ieee80211_start_scan(sdata, scan_req); 1087 if (rc) { 1088 /* need to complete scan in cfg80211 */ 1089 rcu_assign_pointer(local->scan_req, scan_req); 1090 aborted = true; 1091 goto out_complete; 1092 } else 1093 goto out; 1094 } 1095 1096 clear_bit(SCAN_BEACON_WAIT, &local->scanning); 1097 1098 /* 1099 * as long as no delay is required advance immediately 1100 * without scheduling a new work 1101 */ 1102 do { 1103 if (!ieee80211_sdata_running(sdata)) { 1104 aborted = true; 1105 goto out_complete; 1106 } 1107 1108 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) && 1109 local->next_scan_state == SCAN_DECISION) 1110 local->next_scan_state = SCAN_SEND_PROBE; 1111 1112 switch (local->next_scan_state) { 1113 case SCAN_DECISION: 1114 /* if no more bands/channels left, complete scan */ 1115 if (local->scan_channel_idx >= scan_req->n_channels) { 1116 aborted = false; 1117 goto out_complete; 1118 } 1119 ieee80211_scan_state_decision(local, &next_delay); 1120 break; 1121 case SCAN_SET_CHANNEL: 1122 ieee80211_scan_state_set_channel(local, &next_delay); 1123 break; 1124 case SCAN_SEND_PROBE: 1125 ieee80211_scan_state_send_probe(local, &next_delay); 1126 break; 1127 case SCAN_SUSPEND: 1128 ieee80211_scan_state_suspend(local, &next_delay); 1129 break; 1130 case SCAN_RESUME: 1131 ieee80211_scan_state_resume(local, &next_delay); 1132 break; 1133 case SCAN_ABORT: 1134 aborted = true; 1135 goto out_complete; 1136 } 1137 } while (next_delay == 0); 1138 1139 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 1140 next_delay); 1141 goto out; 1142 1143 out_complete: 1144 __ieee80211_scan_completed(&local->hw, aborted); 1145 out: 1146 mutex_unlock(&local->mtx); 1147 } 1148 1149 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 1150 struct cfg80211_scan_request *req) 1151 { 1152 int res; 1153 1154 mutex_lock(&sdata->local->mtx); 1155 res = __ieee80211_start_scan(sdata, req); 1156 mutex_unlock(&sdata->local->mtx); 1157 1158 return res; 1159 } 1160 1161 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, 1162 const u8 *ssid, u8 ssid_len, 1163 struct ieee80211_channel **channels, 1164 unsigned int n_channels, 1165 enum nl80211_bss_scan_width scan_width) 1166 { 1167 struct ieee80211_local *local = sdata->local; 1168 int ret = -EBUSY, i, n_ch = 0; 1169 enum nl80211_band band; 1170 1171 mutex_lock(&local->mtx); 1172 1173 /* busy scanning */ 1174 if (local->scan_req) 1175 goto unlock; 1176 1177 /* fill internal scan request */ 1178 if (!channels) { 1179 int max_n; 1180 1181 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1182 if (!local->hw.wiphy->bands[band] || 1183 band == NL80211_BAND_6GHZ) 1184 continue; 1185 1186 max_n = local->hw.wiphy->bands[band]->n_channels; 1187 for (i = 0; i < max_n; i++) { 1188 struct ieee80211_channel *tmp_ch = 1189 &local->hw.wiphy->bands[band]->channels[i]; 1190 1191 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR | 1192 IEEE80211_CHAN_DISABLED)) 1193 continue; 1194 1195 local->int_scan_req->channels[n_ch] = tmp_ch; 1196 n_ch++; 1197 } 1198 } 1199 1200 if (WARN_ON_ONCE(n_ch == 0)) 1201 goto unlock; 1202 1203 local->int_scan_req->n_channels = n_ch; 1204 } else { 1205 for (i = 0; i < n_channels; i++) { 1206 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR | 1207 IEEE80211_CHAN_DISABLED)) 1208 continue; 1209 1210 local->int_scan_req->channels[n_ch] = channels[i]; 1211 n_ch++; 1212 } 1213 1214 if (WARN_ON_ONCE(n_ch == 0)) 1215 goto unlock; 1216 1217 local->int_scan_req->n_channels = n_ch; 1218 } 1219 1220 local->int_scan_req->ssids = &local->scan_ssid; 1221 local->int_scan_req->n_ssids = 1; 1222 local->int_scan_req->scan_width = scan_width; 1223 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 1224 local->int_scan_req->ssids[0].ssid_len = ssid_len; 1225 1226 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 1227 unlock: 1228 mutex_unlock(&local->mtx); 1229 return ret; 1230 } 1231 1232 void ieee80211_scan_cancel(struct ieee80211_local *local) 1233 { 1234 /* ensure a new scan cannot be queued */ 1235 lockdep_assert_wiphy(local->hw.wiphy); 1236 1237 /* 1238 * We are canceling software scan, or deferred scan that was not 1239 * yet really started (see __ieee80211_start_scan ). 1240 * 1241 * Regarding hardware scan: 1242 * - we can not call __ieee80211_scan_completed() as when 1243 * SCAN_HW_SCANNING bit is set this function change 1244 * local->hw_scan_req to operate on 5G band, what race with 1245 * driver which can use local->hw_scan_req 1246 * 1247 * - we can not cancel scan_work since driver can schedule it 1248 * by ieee80211_scan_completed(..., true) to finish scan 1249 * 1250 * Hence we only call the cancel_hw_scan() callback, but the low-level 1251 * driver is still responsible for calling ieee80211_scan_completed() 1252 * after the scan was completed/aborted. 1253 */ 1254 1255 mutex_lock(&local->mtx); 1256 if (!local->scan_req) 1257 goto out; 1258 1259 /* 1260 * We have a scan running and the driver already reported completion, 1261 * but the worker hasn't run yet or is stuck on the mutex - mark it as 1262 * cancelled. 1263 */ 1264 if (test_bit(SCAN_HW_SCANNING, &local->scanning) && 1265 test_bit(SCAN_COMPLETED, &local->scanning)) { 1266 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1267 goto out; 1268 } 1269 1270 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { 1271 /* 1272 * Make sure that __ieee80211_scan_completed doesn't trigger a 1273 * scan on another band. 1274 */ 1275 set_bit(SCAN_HW_CANCELLED, &local->scanning); 1276 if (local->ops->cancel_hw_scan) 1277 drv_cancel_hw_scan(local, 1278 rcu_dereference_protected(local->scan_sdata, 1279 lockdep_is_held(&local->mtx))); 1280 goto out; 1281 } 1282 1283 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work); 1284 /* and clean up */ 1285 memset(&local->scan_info, 0, sizeof(local->scan_info)); 1286 __ieee80211_scan_completed(&local->hw, true); 1287 out: 1288 mutex_unlock(&local->mtx); 1289 } 1290 1291 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1292 struct cfg80211_sched_scan_request *req) 1293 { 1294 struct ieee80211_local *local = sdata->local; 1295 struct ieee80211_scan_ies sched_scan_ies = {}; 1296 struct cfg80211_chan_def chandef; 1297 int ret, i, iebufsz, num_bands = 0; 1298 u32 rate_masks[NUM_NL80211_BANDS] = {}; 1299 u8 bands_used = 0; 1300 u8 *ie; 1301 u32 flags = 0; 1302 1303 iebufsz = local->scan_ies_len + req->ie_len; 1304 1305 lockdep_assert_held(&local->mtx); 1306 1307 if (!local->ops->sched_scan_start) 1308 return -ENOTSUPP; 1309 1310 for (i = 0; i < NUM_NL80211_BANDS; i++) { 1311 if (local->hw.wiphy->bands[i]) { 1312 bands_used |= BIT(i); 1313 rate_masks[i] = (u32) -1; 1314 num_bands++; 1315 } 1316 } 1317 1318 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) 1319 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT; 1320 1321 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL); 1322 if (!ie) { 1323 ret = -ENOMEM; 1324 goto out; 1325 } 1326 1327 ieee80211_prepare_scan_chandef(&chandef, req->scan_width); 1328 1329 ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz, 1330 &sched_scan_ies, req->ie, 1331 req->ie_len, bands_used, rate_masks, &chandef, 1332 flags); 1333 1334 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); 1335 if (ret == 0) { 1336 rcu_assign_pointer(local->sched_scan_sdata, sdata); 1337 rcu_assign_pointer(local->sched_scan_req, req); 1338 } 1339 1340 kfree(ie); 1341 1342 out: 1343 if (ret) { 1344 /* Clean in case of failure after HW restart or upon resume. */ 1345 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1346 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1347 } 1348 1349 return ret; 1350 } 1351 1352 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, 1353 struct cfg80211_sched_scan_request *req) 1354 { 1355 struct ieee80211_local *local = sdata->local; 1356 int ret; 1357 1358 mutex_lock(&local->mtx); 1359 1360 if (rcu_access_pointer(local->sched_scan_sdata)) { 1361 mutex_unlock(&local->mtx); 1362 return -EBUSY; 1363 } 1364 1365 ret = __ieee80211_request_sched_scan_start(sdata, req); 1366 1367 mutex_unlock(&local->mtx); 1368 return ret; 1369 } 1370 1371 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local) 1372 { 1373 struct ieee80211_sub_if_data *sched_scan_sdata; 1374 int ret = -ENOENT; 1375 1376 mutex_lock(&local->mtx); 1377 1378 if (!local->ops->sched_scan_stop) { 1379 ret = -ENOTSUPP; 1380 goto out; 1381 } 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->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 out: 1394 mutex_unlock(&local->mtx); 1395 1396 return ret; 1397 } 1398 1399 void ieee80211_sched_scan_results(struct ieee80211_hw *hw) 1400 { 1401 struct ieee80211_local *local = hw_to_local(hw); 1402 1403 trace_api_sched_scan_results(local); 1404 1405 cfg80211_sched_scan_results(hw->wiphy, 0); 1406 } 1407 EXPORT_SYMBOL(ieee80211_sched_scan_results); 1408 1409 void ieee80211_sched_scan_end(struct ieee80211_local *local) 1410 { 1411 mutex_lock(&local->mtx); 1412 1413 if (!rcu_access_pointer(local->sched_scan_sdata)) { 1414 mutex_unlock(&local->mtx); 1415 return; 1416 } 1417 1418 RCU_INIT_POINTER(local->sched_scan_sdata, NULL); 1419 1420 /* If sched scan was aborted by the driver. */ 1421 RCU_INIT_POINTER(local->sched_scan_req, NULL); 1422 1423 mutex_unlock(&local->mtx); 1424 1425 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0); 1426 } 1427 1428 void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy, 1429 struct wiphy_work *work) 1430 { 1431 struct ieee80211_local *local = 1432 container_of(work, struct ieee80211_local, 1433 sched_scan_stopped_work); 1434 1435 ieee80211_sched_scan_end(local); 1436 } 1437 1438 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) 1439 { 1440 struct ieee80211_local *local = hw_to_local(hw); 1441 1442 trace_api_sched_scan_stopped(local); 1443 1444 /* 1445 * this shouldn't really happen, so for simplicity 1446 * simply ignore it, and let mac80211 reconfigure 1447 * the sched scan later on. 1448 */ 1449 if (local->in_reconfig) 1450 return; 1451 1452 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work); 1453 } 1454 EXPORT_SYMBOL(ieee80211_sched_scan_stopped); 1455