1 // SPDX-License-Identifier: GPL-2.0-only
3 * Scanning implementation
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
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>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #define IEEE80211_PROBE_DELAY (HZ / 33)
29 #define IEEE80211_CHANNEL_TIME (HZ / 33)
30 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
32 void ieee80211_rx_bss_put(struct ieee80211_local *local,
33 struct ieee80211_bss *bss)
37 cfg80211_put_bss(local->hw.wiphy,
38 container_of((void *)bss, struct cfg80211_bss, priv));
41 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
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];
52 /* no valid wmm information or parameter element found */
55 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
58 struct inform_bss_update_data {
59 struct ieee80211_rx_status *rx_status;
63 void ieee80211_inform_bss(struct wiphy *wiphy,
64 struct cfg80211_bss *cbss,
65 const struct cfg80211_bss_ies *ies,
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;
75 /* This happens while joining an IBSS */
79 elems = ieee802_11_parse_elems(ies->data, ies->len, false, NULL);
83 rx_status = update_data->rx_status;
85 if (update_data->beacon)
86 bss->device_ts_beacon = rx_status->device_timestamp;
88 bss->device_ts_presp = rx_status->device_timestamp;
90 if (elems->parse_error) {
91 if (update_data->beacon)
92 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
94 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
96 if (update_data->beacon)
97 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
99 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
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;
111 /* replace old supported rates if we get new values */
112 if (!elems->parse_error ||
113 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
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);
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,
131 bss->supp_rates_len = srlen;
132 if (!elems->parse_error)
133 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
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;
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))
151 &sband->bitrates[rx_status->rate_idx];
154 if (elems->vht_cap_elem)
156 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
158 bss->vht_cap_info = 0;
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)
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,
176 struct cfg80211_inform_bss bss_meta = {
177 .boottime_ns = rx_status->boottime_ns,
178 .drv_data = (void *)&update_data,
181 struct ieee80211_sub_if_data *scan_sdata;
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;
190 bss_meta.chan = channel;
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;
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
202 if (ieee80211_vif_is_mld(&scan_sdata->vif)) {
203 if (rx_status->link_valid) {
204 s8 link_id = rx_status->link_id;
207 rcu_dereference(scan_sdata->vif.link_conf[link_id]);
210 link_conf = &scan_sdata->vif.bss_conf;
214 bss_meta.parent_tsf =
215 ieee80211_calculate_rx_timestamp(local,
220 ether_addr_copy(bss_meta.parent_bssid,
226 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
227 mgmt, len, GFP_ATOMIC);
231 /* In case the signal is invalid update the status */
232 signal_valid = channel == cbss->channel;
234 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
236 return (void *)cbss->priv;
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)
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))
252 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
254 return ether_addr_equal(da, sdata->vif.addr);
257 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
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);
266 if (!ieee80211_is_probe_resp(mgmt->frame_control) &&
267 !ieee80211_is_beacon(mgmt->frame_control) &&
268 !ieee80211_is_s1g_beacon(mgmt->frame_control))
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);
276 min_hdr_len = offsetof(struct ieee80211_ext,
280 if (skb->len < min_hdr_len)
283 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) {
285 * we were passive scanning because of radar/no-IR, but
286 * the beacon/proberesp rx gives us an opportunity to upgrade
289 set_bit(SCAN_BEACON_DONE, &local->scanning);
290 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
293 channel = ieee80211_get_channel_khz(local->hw.wiphy,
294 ieee80211_rx_status_to_khz(rx_status));
296 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
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;
305 sdata1 = rcu_dereference(local->scan_sdata);
306 sdata2 = rcu_dereference(local->sched_scan_sdata);
308 if (likely(!sdata1 && !sdata2))
311 scan_req = rcu_dereference(local->scan_req);
312 sched_scan_req = rcu_dereference(local->sched_scan_req);
315 scan_req_flags = scan_req->flags;
318 sched_scan_req_flags = sched_scan_req->flags;
320 /* ignore ProbeResp to foreign address or non-bcast (OCE)
321 * unless scanning with randomised address
323 if (!ieee80211_scan_accept_presp(sdata1, channel,
326 !ieee80211_scan_accept_presp(sdata2, channel,
327 sched_scan_req_flags,
331 /* Beacons are expected only with broadcast address */
332 if (!is_broadcast_ether_addr(mgmt->da))
336 /* Do not update the BSS table in case of only monitor interfaces */
337 if (local->open_count == local->monitors)
340 bss = ieee80211_bss_info_update(local, rx_status,
344 ieee80211_rx_bss_put(local, bss);
347 static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef)
349 memset(chandef, 0, sizeof(*chandef));
351 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
354 /* return false if no more work */
355 static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata)
357 struct ieee80211_local *local = sdata->local;
358 struct cfg80211_scan_request *req;
359 struct cfg80211_chan_def chandef;
361 int i, ielen, n_chans;
364 req = rcu_dereference_protected(local->scan_req,
365 lockdep_is_held(&local->hw.wiphy->mtx));
367 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
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);
376 n_chans = req->n_channels;
379 if (local->hw_scan_band == NUM_NL80211_BANDS)
384 for (i = 0; i < req->n_channels; i++) {
385 if (req->channels[i]->band !=
388 local->hw_scan_req->req.channels[n_chans] =
391 bands_used |= BIT(req->channels[i]->band);
394 local->hw_scan_band++;
398 local->hw_scan_req->req.n_channels = n_chans;
399 ieee80211_prepare_scan_chandef(&chandef);
401 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
402 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
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,
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,
418 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
423 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
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;
432 lockdep_assert_wiphy(local->hw.wiphy);
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
440 if (WARN_ON(!local->scanning && !aborted))
443 if (WARN_ON(!local->scan_req))
446 scan_sdata = rcu_dereference_protected(local->scan_sdata,
447 lockdep_is_held(&local->hw.wiphy->mtx));
449 if (hw_scan && !aborted &&
450 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
451 ieee80211_prep_hw_scan(scan_sdata)) {
454 rc = drv_hw_scan(local,
455 rcu_dereference_protected(local->scan_sdata,
456 lockdep_is_held(&local->hw.wiphy->mtx)),
462 /* HW scan failed and is going to be reported as aborted,
463 * so clear old scan info.
465 memset(&local->scan_info, 0, sizeof(local->scan_info));
469 kfree(local->hw_scan_req);
470 local->hw_scan_req = NULL;
472 scan_req = rcu_dereference_protected(local->scan_req,
473 lockdep_is_held(&local->hw.wiphy->mtx));
475 RCU_INIT_POINTER(local->scan_req, NULL);
476 RCU_INIT_POINTER(local->scan_sdata, NULL);
479 local->scan_chandef.chan = NULL;
483 if (scan_req != local->int_scan_req) {
484 local->scan_info.aborted = aborted;
485 cfg80211_scan_done(scan_req, &local->scan_info);
488 /* Set power back to normal operating levels. */
489 ieee80211_hw_conf_chan(local);
491 if (!hw_scan && was_scanning) {
492 ieee80211_configure_filter(local);
493 drv_sw_scan_complete(local, scan_sdata);
494 ieee80211_offchannel_return(local);
497 ieee80211_recalc_idle(local);
499 ieee80211_mlme_notify_scan_completed(local);
500 ieee80211_ibss_notify_scan_completed(local);
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.
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);
512 ieee80211_start_next_roc(local);
515 void ieee80211_scan_completed(struct ieee80211_hw *hw,
516 struct cfg80211_scan_info *info)
518 struct ieee80211_local *local = hw_to_local(hw);
520 trace_api_scan_completed(local, info->aborted);
522 set_bit(SCAN_COMPLETED, &local->scanning);
524 set_bit(SCAN_ABORTED, &local->scanning);
526 memcpy(&local->scan_info, info, sizeof(*info));
528 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
530 EXPORT_SYMBOL(ieee80211_scan_completed);
532 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
533 struct ieee80211_sub_if_data *sdata)
535 /* Software scan is not supported in multi-channel cases */
536 if (!local->emulate_chanctx)
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.
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().
552 drv_sw_scan_start(local, sdata, local->scan_addr);
554 local->leave_oper_channel_time = jiffies;
555 local->next_scan_state = SCAN_DECISION;
556 local->scan_channel_idx = 0;
558 ieee80211_offchannel_stop_vifs(local);
560 /* ensure nullfunc is transmitted before leaving operating channel */
561 ieee80211_flush_queues(local, NULL, false);
563 ieee80211_configure_filter(local);
565 /* We need to set power level at maximum rate for scanning. */
566 ieee80211_hw_conf_chan(local);
568 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
573 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
575 struct ieee80211_local *local = sdata->local;
576 struct ieee80211_sub_if_data *sdata_iter;
578 lockdep_assert_wiphy(local->hw.wiphy);
580 if (!ieee80211_is_radar_required(local))
583 if (!regulatory_pre_cac_allowed(local->hw.wiphy))
586 list_for_each_entry(sdata_iter, &local->interfaces, list) {
587 if (sdata_iter->wdev.cac_started)
594 static bool ieee80211_can_scan(struct ieee80211_local *local,
595 struct ieee80211_sub_if_data *sdata)
597 if (!__ieee80211_can_leave_ch(sdata))
600 if (!list_empty(&local->roc_list))
603 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
604 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
610 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
612 lockdep_assert_wiphy(local->hw.wiphy);
614 if (!local->scan_req || local->scanning)
617 if (!ieee80211_can_scan(local,
618 rcu_dereference_protected(
620 lockdep_is_held(&local->hw.wiphy->mtx))))
623 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
624 round_jiffies_relative(0));
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)
636 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
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();
646 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
648 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
650 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
651 IEEE80211_SKB_CB(skb)->control.flags |= IEEE80211_TX_CTRL_SCAN_TX;
652 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
656 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
657 unsigned long *next_delay)
660 struct ieee80211_sub_if_data *sdata;
661 struct cfg80211_scan_request *scan_req;
662 enum nl80211_band band = local->hw.conf.chandef.chan->band;
663 u32 flags = 0, tx_flags;
665 scan_req = rcu_dereference_protected(local->scan_req,
666 lockdep_is_held(&local->hw.wiphy->mtx));
668 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
669 if (scan_req->no_cck)
670 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
671 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
672 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
673 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
674 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
676 sdata = rcu_dereference_protected(local->scan_sdata,
677 lockdep_is_held(&local->hw.wiphy->mtx));
679 for (i = 0; i < scan_req->n_ssids; i++)
680 ieee80211_send_scan_probe_req(
681 sdata, local->scan_addr, scan_req->bssid,
682 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
683 scan_req->ie, scan_req->ie_len,
684 scan_req->rates[band], flags,
685 tx_flags, local->hw.conf.chandef.chan);
688 * After sending probe requests, wait for probe responses
691 *next_delay = msecs_to_jiffies(scan_req->duration) >
692 IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ?
693 msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY :
694 IEEE80211_CHANNEL_TIME;
695 local->next_scan_state = SCAN_DECISION;
698 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
699 struct cfg80211_scan_request *req)
701 struct ieee80211_local *local = sdata->local;
702 bool hw_scan = local->ops->hw_scan;
705 lockdep_assert_wiphy(local->hw.wiphy);
710 /* For an MLO connection, if a link ID was specified, validate that it
711 * is indeed active. If no link ID was specified, select one of the
714 if (ieee80211_vif_is_mld(&sdata->vif)) {
715 if (req->tsf_report_link_id >= 0) {
716 if (!(sdata->vif.active_links &
717 BIT(req->tsf_report_link_id)))
720 req->tsf_report_link_id =
721 __ffs(sdata->vif.active_links);
725 if (!__ieee80211_can_leave_ch(sdata))
728 if (!ieee80211_can_scan(local, sdata)) {
729 /* wait for the work to finish/time out */
730 rcu_assign_pointer(local->scan_req, req);
731 rcu_assign_pointer(local->scan_sdata, sdata);
739 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
741 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
743 u8 bands_counted = 0;
745 for (i = 0; i < req->n_channels; i++) {
746 if (bands_counted & BIT(req->channels[i]->band))
748 bands_counted |= BIT(req->channels[i]->band);
752 local->hw_scan_ies_bufsize *= n_bands;
755 local->hw_scan_req = kmalloc(
756 sizeof(*local->hw_scan_req) +
757 req->n_channels * sizeof(req->channels[0]) +
758 local->hw_scan_ies_bufsize, GFP_KERNEL);
759 if (!local->hw_scan_req)
762 local->hw_scan_req->req.ssids = req->ssids;
763 local->hw_scan_req->req.n_ssids = req->n_ssids;
764 ies = (u8 *)local->hw_scan_req +
765 sizeof(*local->hw_scan_req) +
766 req->n_channels * sizeof(req->channels[0]);
767 local->hw_scan_req->req.ie = ies;
768 local->hw_scan_req->req.flags = req->flags;
769 eth_broadcast_addr(local->hw_scan_req->req.bssid);
770 local->hw_scan_req->req.duration = req->duration;
771 local->hw_scan_req->req.duration_mandatory =
772 req->duration_mandatory;
773 local->hw_scan_req->req.tsf_report_link_id =
774 req->tsf_report_link_id;
776 local->hw_scan_band = 0;
777 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params;
778 local->hw_scan_req->req.scan_6ghz_params =
779 req->scan_6ghz_params;
780 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz;
783 * After allocating local->hw_scan_req, we must
784 * go through until ieee80211_prep_hw_scan(), so
785 * anything that might be changed here and leave
786 * this function early must not go after this
791 rcu_assign_pointer(local->scan_req, req);
792 rcu_assign_pointer(local->scan_sdata, sdata);
794 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
795 get_random_mask_addr(local->scan_addr,
799 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
802 __set_bit(SCAN_HW_SCANNING, &local->scanning);
803 } else if ((req->n_channels == 1) &&
804 (req->channels[0] == local->hw.conf.chandef.chan)) {
806 * If we are scanning only on the operating channel
807 * then we do not need to stop normal activities
809 unsigned long next_delay;
811 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
813 ieee80211_recalc_idle(local);
815 /* Notify driver scan is starting, keep order of operations
816 * same as normal software scan, in case that matters. */
817 drv_sw_scan_start(local, sdata, local->scan_addr);
819 ieee80211_configure_filter(local); /* accept probe-responses */
821 /* We need to ensure power level is at max for scanning. */
822 ieee80211_hw_conf_chan(local);
824 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
825 IEEE80211_CHAN_RADAR)) ||
827 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
829 set_bit(SCAN_BEACON_WAIT, &local->scanning);
831 ieee80211_scan_state_send_probe(local, &next_delay);
832 next_delay = IEEE80211_CHANNEL_TIME;
835 /* Now, just wait a bit and we are all done! */
836 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
840 /* Do normal software scan */
841 __set_bit(SCAN_SW_SCANNING, &local->scanning);
844 ieee80211_recalc_idle(local);
847 WARN_ON(!ieee80211_prep_hw_scan(sdata));
848 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
850 rc = ieee80211_start_sw_scan(local, sdata);
854 kfree(local->hw_scan_req);
855 local->hw_scan_req = NULL;
858 ieee80211_recalc_idle(local);
860 local->scan_req = NULL;
861 RCU_INIT_POINTER(local->scan_sdata, NULL);
864 if (hw_scan && rc == 1) {
866 * we can't fall back to software for P2P-GO
867 * as it must update NoA etc.
869 if (ieee80211_vif_type_p2p(&sdata->vif) ==
870 NL80211_IFTYPE_P2P_GO)
880 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
883 * TODO: channel switching also consumes quite some time,
884 * add that delay as well to get a better estimation
886 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
887 return IEEE80211_PASSIVE_CHANNEL_TIME;
888 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
891 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
892 unsigned long *next_delay)
894 bool associated = false;
895 bool tx_empty = true;
897 struct ieee80211_sub_if_data *sdata;
898 struct ieee80211_channel *next_chan;
899 enum mac80211_scan_state next_scan_state;
900 struct cfg80211_scan_request *scan_req;
902 lockdep_assert_wiphy(local->hw.wiphy);
905 * check if at least one STA interface is associated,
906 * check if at least one STA interface has pending tx frames
907 * and grab the lowest used beacon interval
909 list_for_each_entry(sdata, &local->interfaces, list) {
910 if (!ieee80211_sdata_running(sdata))
913 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
914 if (sdata->u.mgd.associated) {
917 if (!qdisc_all_tx_empty(sdata->dev)) {
925 scan_req = rcu_dereference_protected(local->scan_req,
926 lockdep_is_held(&local->hw.wiphy->mtx));
928 next_chan = scan_req->channels[local->scan_channel_idx];
931 * we're currently scanning a different channel, let's
932 * see if we can scan another channel without interfering
933 * with the current traffic situation.
935 * Keep good latency, do not stay off-channel more than 125 ms.
938 bad_latency = time_after(jiffies +
939 ieee80211_scan_get_channel_time(next_chan),
940 local->leave_oper_channel_time + HZ / 8);
942 if (associated && !tx_empty) {
943 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
944 next_scan_state = SCAN_ABORT;
946 next_scan_state = SCAN_SUSPEND;
947 } else if (associated && bad_latency) {
948 next_scan_state = SCAN_SUSPEND;
950 next_scan_state = SCAN_SET_CHANNEL;
953 local->next_scan_state = next_scan_state;
958 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
959 unsigned long *next_delay)
962 struct ieee80211_channel *chan;
963 struct cfg80211_scan_request *scan_req;
965 scan_req = rcu_dereference_protected(local->scan_req,
966 lockdep_is_held(&local->hw.wiphy->mtx));
969 chan = scan_req->channels[local->scan_channel_idx];
971 local->scan_chandef.chan = chan;
972 local->scan_chandef.center_freq1 = chan->center_freq;
973 local->scan_chandef.freq1_offset = chan->freq_offset;
974 local->scan_chandef.center_freq2 = 0;
976 /* For scanning on the S1G band, detect the channel width according to
977 * the channel being scanned.
979 if (chan->band == NL80211_BAND_S1GHZ) {
980 local->scan_chandef.width = ieee80211_s1g_channel_width(chan);
984 /* If scanning on oper channel, use whatever channel-type
985 * is currently in use.
987 if (chan == local->hw.conf.chandef.chan)
988 local->scan_chandef = local->hw.conf.chandef;
990 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
993 if (ieee80211_hw_conf_chan(local))
996 /* advance state machine to next channel/band */
997 local->scan_channel_idx++;
1000 /* if we skip this channel return to the decision state */
1001 local->next_scan_state = SCAN_DECISION;
1006 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
1007 * (which unfortunately doesn't say _why_ step a) is done,
1008 * but it waits for the probe delay or until a frame is
1009 * received - and the received frame would update the NAV).
1010 * For now, we do not support waiting until a frame is
1013 * In any case, it is not necessary for a passive scan.
1015 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
1016 !scan_req->n_ssids) {
1017 *next_delay = msecs_to_jiffies(scan_req->duration) >
1018 IEEE80211_PASSIVE_CHANNEL_TIME ?
1019 msecs_to_jiffies(scan_req->duration) :
1020 IEEE80211_PASSIVE_CHANNEL_TIME;
1021 local->next_scan_state = SCAN_DECISION;
1022 if (scan_req->n_ssids)
1023 set_bit(SCAN_BEACON_WAIT, &local->scanning);
1027 /* active scan, send probes */
1028 *next_delay = IEEE80211_PROBE_DELAY;
1029 local->next_scan_state = SCAN_SEND_PROBE;
1032 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
1033 unsigned long *next_delay)
1035 /* switch back to the operating channel */
1036 local->scan_chandef.chan = NULL;
1037 ieee80211_hw_conf_chan(local);
1040 ieee80211_offchannel_return(local);
1042 *next_delay = HZ / 5;
1043 /* afterwards, resume scan & go to next channel */
1044 local->next_scan_state = SCAN_RESUME;
1047 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
1048 unsigned long *next_delay)
1050 ieee80211_offchannel_stop_vifs(local);
1052 if (local->ops->flush) {
1053 ieee80211_flush_queues(local, NULL, false);
1056 *next_delay = HZ / 10;
1058 /* remember when we left the operating channel */
1059 local->leave_oper_channel_time = jiffies;
1061 /* advance to the next channel to be scanned */
1062 local->next_scan_state = SCAN_SET_CHANNEL;
1065 void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work)
1067 struct ieee80211_local *local =
1068 container_of(work, struct ieee80211_local, scan_work.work);
1069 struct ieee80211_sub_if_data *sdata;
1070 struct cfg80211_scan_request *scan_req;
1071 unsigned long next_delay = 0;
1074 lockdep_assert_wiphy(local->hw.wiphy);
1076 if (!ieee80211_can_run_worker(local)) {
1081 sdata = rcu_dereference_protected(local->scan_sdata,
1082 lockdep_is_held(&local->hw.wiphy->mtx));
1083 scan_req = rcu_dereference_protected(local->scan_req,
1084 lockdep_is_held(&local->hw.wiphy->mtx));
1086 /* When scanning on-channel, the first-callback means completed. */
1087 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
1088 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1092 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
1093 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1097 if (!sdata || !scan_req)
1100 if (!local->scanning) {
1103 RCU_INIT_POINTER(local->scan_req, NULL);
1104 RCU_INIT_POINTER(local->scan_sdata, NULL);
1106 rc = __ieee80211_start_scan(sdata, scan_req);
1109 /* need to complete scan in cfg80211 */
1110 rcu_assign_pointer(local->scan_req, scan_req);
1115 clear_bit(SCAN_BEACON_WAIT, &local->scanning);
1118 * as long as no delay is required advance immediately
1119 * without scheduling a new work
1122 if (!ieee80211_sdata_running(sdata)) {
1127 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) &&
1128 local->next_scan_state == SCAN_DECISION)
1129 local->next_scan_state = SCAN_SEND_PROBE;
1131 switch (local->next_scan_state) {
1133 /* if no more bands/channels left, complete scan */
1134 if (local->scan_channel_idx >= scan_req->n_channels) {
1138 ieee80211_scan_state_decision(local, &next_delay);
1140 case SCAN_SET_CHANNEL:
1141 ieee80211_scan_state_set_channel(local, &next_delay);
1143 case SCAN_SEND_PROBE:
1144 ieee80211_scan_state_send_probe(local, &next_delay);
1147 ieee80211_scan_state_suspend(local, &next_delay);
1150 ieee80211_scan_state_resume(local, &next_delay);
1156 } while (next_delay == 0);
1158 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
1163 __ieee80211_scan_completed(&local->hw, aborted);
1166 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1167 struct cfg80211_scan_request *req)
1169 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1171 return __ieee80211_start_scan(sdata, req);
1174 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1175 const u8 *ssid, u8 ssid_len,
1176 struct ieee80211_channel **channels,
1177 unsigned int n_channels)
1179 struct ieee80211_local *local = sdata->local;
1180 int ret = -EBUSY, i, n_ch = 0;
1181 enum nl80211_band band;
1183 lockdep_assert_wiphy(local->hw.wiphy);
1186 if (local->scan_req)
1189 /* fill internal scan request */
1193 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1194 if (!local->hw.wiphy->bands[band] ||
1195 band == NL80211_BAND_6GHZ)
1198 max_n = local->hw.wiphy->bands[band]->n_channels;
1199 for (i = 0; i < max_n; i++) {
1200 struct ieee80211_channel *tmp_ch =
1201 &local->hw.wiphy->bands[band]->channels[i];
1203 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1204 IEEE80211_CHAN_DISABLED))
1207 local->int_scan_req->channels[n_ch] = tmp_ch;
1212 if (WARN_ON_ONCE(n_ch == 0))
1215 local->int_scan_req->n_channels = n_ch;
1217 for (i = 0; i < n_channels; i++) {
1218 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1219 IEEE80211_CHAN_DISABLED))
1222 local->int_scan_req->channels[n_ch] = channels[i];
1226 if (WARN_ON_ONCE(n_ch == 0))
1229 local->int_scan_req->n_channels = n_ch;
1232 local->int_scan_req->ssids = &local->scan_ssid;
1233 local->int_scan_req->n_ssids = 1;
1234 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1235 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1237 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1242 void ieee80211_scan_cancel(struct ieee80211_local *local)
1244 /* ensure a new scan cannot be queued */
1245 lockdep_assert_wiphy(local->hw.wiphy);
1248 * We are canceling software scan, or deferred scan that was not
1249 * yet really started (see __ieee80211_start_scan ).
1251 * Regarding hardware scan:
1252 * - we can not call __ieee80211_scan_completed() as when
1253 * SCAN_HW_SCANNING bit is set this function change
1254 * local->hw_scan_req to operate on 5G band, what race with
1255 * driver which can use local->hw_scan_req
1257 * - we can not cancel scan_work since driver can schedule it
1258 * by ieee80211_scan_completed(..., true) to finish scan
1260 * Hence we only call the cancel_hw_scan() callback, but the low-level
1261 * driver is still responsible for calling ieee80211_scan_completed()
1262 * after the scan was completed/aborted.
1265 if (!local->scan_req)
1269 * We have a scan running and the driver already reported completion,
1270 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1273 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1274 test_bit(SCAN_COMPLETED, &local->scanning)) {
1275 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1279 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1281 * Make sure that __ieee80211_scan_completed doesn't trigger a
1282 * scan on another band.
1284 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1285 if (local->ops->cancel_hw_scan)
1286 drv_cancel_hw_scan(local,
1287 rcu_dereference_protected(local->scan_sdata,
1288 lockdep_is_held(&local->hw.wiphy->mtx)));
1292 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work);
1294 memset(&local->scan_info, 0, sizeof(local->scan_info));
1295 __ieee80211_scan_completed(&local->hw, true);
1298 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1299 struct cfg80211_sched_scan_request *req)
1301 struct ieee80211_local *local = sdata->local;
1302 struct ieee80211_scan_ies sched_scan_ies = {};
1303 struct cfg80211_chan_def chandef;
1304 int ret, i, iebufsz, num_bands = 0;
1305 u32 rate_masks[NUM_NL80211_BANDS] = {};
1310 lockdep_assert_wiphy(local->hw.wiphy);
1312 iebufsz = local->scan_ies_len + req->ie_len;
1314 if (!local->ops->sched_scan_start)
1317 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1318 if (local->hw.wiphy->bands[i]) {
1319 bands_used |= BIT(i);
1320 rate_masks[i] = (u32) -1;
1325 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1326 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1328 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
1334 ieee80211_prepare_scan_chandef(&chandef);
1336 ret = ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz,
1337 &sched_scan_ies, req->ie,
1338 req->ie_len, bands_used, rate_masks,
1343 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1345 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1346 rcu_assign_pointer(local->sched_scan_req, req);
1353 /* Clean in case of failure after HW restart or upon resume. */
1354 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1355 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1361 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1362 struct cfg80211_sched_scan_request *req)
1364 struct ieee80211_local *local = sdata->local;
1366 lockdep_assert_wiphy(local->hw.wiphy);
1368 if (rcu_access_pointer(local->sched_scan_sdata))
1371 return __ieee80211_request_sched_scan_start(sdata, req);
1374 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1376 struct ieee80211_sub_if_data *sched_scan_sdata;
1379 lockdep_assert_wiphy(local->hw.wiphy);
1381 if (!local->ops->sched_scan_stop)
1384 /* We don't want to restart sched scan anymore. */
1385 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1387 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1388 lockdep_is_held(&local->hw.wiphy->mtx));
1389 if (sched_scan_sdata) {
1390 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1392 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1398 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1400 struct ieee80211_local *local = hw_to_local(hw);
1402 trace_api_sched_scan_results(local);
1404 cfg80211_sched_scan_results(hw->wiphy, 0);
1406 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1408 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1410 lockdep_assert_wiphy(local->hw.wiphy);
1412 if (!rcu_access_pointer(local->sched_scan_sdata))
1415 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1417 /* If sched scan was aborted by the driver. */
1418 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1420 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0);
1423 void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy,
1424 struct wiphy_work *work)
1426 struct ieee80211_local *local =
1427 container_of(work, struct ieee80211_local,
1428 sched_scan_stopped_work);
1430 ieee80211_sched_scan_end(local);
1433 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1435 struct ieee80211_local *local = hw_to_local(hw);
1437 trace_api_sched_scan_stopped(local);
1440 * this shouldn't really happen, so for simplicity
1441 * simply ignore it, and let mac80211 reconfigure
1442 * the sched scan later on.
1444 if (local->in_reconfig)
1447 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work);
1449 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);