2 * This file contains helper code to handle channel
3 * settings and keeping track of what is possible at
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 #include <linux/export.h>
11 #include <net/cfg80211.h>
15 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
16 struct ieee80211_channel *chan,
17 enum nl80211_channel_type chan_type)
23 chandef->center_freq2 = 0;
26 case NL80211_CHAN_NO_HT:
27 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
28 chandef->center_freq1 = chan->center_freq;
30 case NL80211_CHAN_HT20:
31 chandef->width = NL80211_CHAN_WIDTH_20;
32 chandef->center_freq1 = chan->center_freq;
34 case NL80211_CHAN_HT40PLUS:
35 chandef->width = NL80211_CHAN_WIDTH_40;
36 chandef->center_freq1 = chan->center_freq + 10;
38 case NL80211_CHAN_HT40MINUS:
39 chandef->width = NL80211_CHAN_WIDTH_40;
40 chandef->center_freq1 = chan->center_freq - 10;
46 EXPORT_SYMBOL(cfg80211_chandef_create);
48 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
55 control_freq = chandef->chan->center_freq;
57 switch (chandef->width) {
58 case NL80211_CHAN_WIDTH_5:
59 case NL80211_CHAN_WIDTH_10:
60 case NL80211_CHAN_WIDTH_20:
61 case NL80211_CHAN_WIDTH_20_NOHT:
62 if (chandef->center_freq1 != control_freq)
64 if (chandef->center_freq2)
67 case NL80211_CHAN_WIDTH_40:
68 if (chandef->center_freq1 != control_freq + 10 &&
69 chandef->center_freq1 != control_freq - 10)
71 if (chandef->center_freq2)
74 case NL80211_CHAN_WIDTH_80P80:
75 if (chandef->center_freq1 != control_freq + 30 &&
76 chandef->center_freq1 != control_freq + 10 &&
77 chandef->center_freq1 != control_freq - 10 &&
78 chandef->center_freq1 != control_freq - 30)
80 if (!chandef->center_freq2)
82 /* adjacent is not allowed -- that's a 160 MHz channel */
83 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
84 chandef->center_freq2 - chandef->center_freq1 == 80)
87 case NL80211_CHAN_WIDTH_80:
88 if (chandef->center_freq1 != control_freq + 30 &&
89 chandef->center_freq1 != control_freq + 10 &&
90 chandef->center_freq1 != control_freq - 10 &&
91 chandef->center_freq1 != control_freq - 30)
93 if (chandef->center_freq2)
96 case NL80211_CHAN_WIDTH_160:
97 if (chandef->center_freq1 != control_freq + 70 &&
98 chandef->center_freq1 != control_freq + 50 &&
99 chandef->center_freq1 != control_freq + 30 &&
100 chandef->center_freq1 != control_freq + 10 &&
101 chandef->center_freq1 != control_freq - 10 &&
102 chandef->center_freq1 != control_freq - 30 &&
103 chandef->center_freq1 != control_freq - 50 &&
104 chandef->center_freq1 != control_freq - 70)
106 if (chandef->center_freq2)
115 EXPORT_SYMBOL(cfg80211_chandef_valid);
117 static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
118 u32 *pri40, u32 *pri80)
123 case NL80211_CHAN_WIDTH_40:
124 *pri40 = c->center_freq1;
127 case NL80211_CHAN_WIDTH_80:
128 case NL80211_CHAN_WIDTH_80P80:
129 *pri80 = c->center_freq1;
131 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
135 *pri40 = c->center_freq1 - 20 + 40 * tmp;
137 case NL80211_CHAN_WIDTH_160:
139 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
143 *pri40 = c->center_freq1 - 60 + 40 * tmp;
146 *pri80 = c->center_freq1 - 40 + 80 * tmp;
153 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
158 case NL80211_CHAN_WIDTH_5:
161 case NL80211_CHAN_WIDTH_10:
164 case NL80211_CHAN_WIDTH_20:
165 case NL80211_CHAN_WIDTH_20_NOHT:
168 case NL80211_CHAN_WIDTH_40:
171 case NL80211_CHAN_WIDTH_80P80:
172 case NL80211_CHAN_WIDTH_80:
175 case NL80211_CHAN_WIDTH_160:
185 const struct cfg80211_chan_def *
186 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
187 const struct cfg80211_chan_def *c2)
189 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
191 /* If they are identical, return */
192 if (cfg80211_chandef_identical(c1, c2))
195 /* otherwise, must have same control channel */
196 if (c1->chan != c2->chan)
200 * If they have the same width, but aren't identical,
201 * then they can't be compatible.
203 if (c1->width == c2->width)
207 * can't be compatible if one of them is 5 or 10 MHz,
208 * but they don't have the same width.
210 if (c1->width == NL80211_CHAN_WIDTH_5 ||
211 c1->width == NL80211_CHAN_WIDTH_10 ||
212 c2->width == NL80211_CHAN_WIDTH_5 ||
213 c2->width == NL80211_CHAN_WIDTH_10)
216 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
217 c1->width == NL80211_CHAN_WIDTH_20)
220 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
221 c2->width == NL80211_CHAN_WIDTH_20)
224 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
225 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
227 if (c1_pri40 != c2_pri40)
230 WARN_ON(!c1_pri80 && !c2_pri80);
231 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
234 if (c1->width > c2->width)
238 EXPORT_SYMBOL(cfg80211_chandef_compatible);
240 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
242 enum nl80211_dfs_state dfs_state)
244 struct ieee80211_channel *c;
247 for (freq = center_freq - bandwidth/2 + 10;
248 freq <= center_freq + bandwidth/2 - 10;
250 c = ieee80211_get_channel(wiphy, freq);
251 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
254 c->dfs_state = dfs_state;
255 c->dfs_state_entered = jiffies;
259 void cfg80211_set_dfs_state(struct wiphy *wiphy,
260 const struct cfg80211_chan_def *chandef,
261 enum nl80211_dfs_state dfs_state)
265 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
268 width = cfg80211_chandef_get_width(chandef);
272 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
275 if (!chandef->center_freq2)
277 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
281 static u32 cfg80211_get_start_freq(u32 center_freq,
287 start_freq = center_freq;
289 start_freq = center_freq - bandwidth/2 + 10;
294 static u32 cfg80211_get_end_freq(u32 center_freq,
300 end_freq = center_freq;
302 end_freq = center_freq + bandwidth/2 - 10;
307 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
311 struct ieee80211_channel *c;
312 u32 freq, start_freq, end_freq;
314 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
315 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
317 for (freq = start_freq; freq <= end_freq; freq += 20) {
318 c = ieee80211_get_channel(wiphy, freq);
322 if (c->flags & IEEE80211_CHAN_RADAR)
329 int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
330 const struct cfg80211_chan_def *chandef,
331 enum nl80211_iftype iftype)
336 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
340 case NL80211_IFTYPE_ADHOC:
341 case NL80211_IFTYPE_AP:
342 case NL80211_IFTYPE_P2P_GO:
343 case NL80211_IFTYPE_MESH_POINT:
344 width = cfg80211_chandef_get_width(chandef);
348 ret = cfg80211_get_chans_dfs_required(wiphy,
349 chandef->center_freq1,
354 return BIT(chandef->width);
356 if (!chandef->center_freq2)
359 ret = cfg80211_get_chans_dfs_required(wiphy,
360 chandef->center_freq2,
365 return BIT(chandef->width);
368 case NL80211_IFTYPE_STATION:
369 case NL80211_IFTYPE_OCB:
370 case NL80211_IFTYPE_P2P_CLIENT:
371 case NL80211_IFTYPE_MONITOR:
372 case NL80211_IFTYPE_AP_VLAN:
373 case NL80211_IFTYPE_WDS:
374 case NL80211_IFTYPE_P2P_DEVICE:
375 case NL80211_IFTYPE_NAN:
377 case NL80211_IFTYPE_UNSPECIFIED:
378 case NUM_NL80211_IFTYPES:
384 EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
386 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
390 struct ieee80211_channel *c;
391 u32 freq, start_freq, end_freq;
394 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
395 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
398 * Check entire range of channels for the bandwidth.
399 * Check all channels are DFS channels (DFS_USABLE or
400 * DFS_AVAILABLE). Return number of usable channels
401 * (require CAC). Allow DFS and non-DFS channel mix.
403 for (freq = start_freq; freq <= end_freq; freq += 20) {
404 c = ieee80211_get_channel(wiphy, freq);
408 if (c->flags & IEEE80211_CHAN_DISABLED)
411 if (c->flags & IEEE80211_CHAN_RADAR) {
412 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
415 if (c->dfs_state == NL80211_DFS_USABLE)
423 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
424 const struct cfg80211_chan_def *chandef)
429 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
432 width = cfg80211_chandef_get_width(chandef);
436 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
442 switch (chandef->width) {
443 case NL80211_CHAN_WIDTH_80P80:
444 WARN_ON(!chandef->center_freq2);
445 r2 = cfg80211_get_chans_dfs_usable(wiphy,
446 chandef->center_freq2,
452 WARN_ON(chandef->center_freq2);
456 return (r1 + r2 > 0);
460 * Checks if center frequency of chan falls with in the bandwidth
463 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
464 struct ieee80211_channel *chan)
469 if (chandef->chan->center_freq == chan->center_freq)
472 width = cfg80211_chandef_get_width(chandef);
476 cf_offset = width / 2 - 10;
478 for (freq = chandef->center_freq1 - width / 2 + 10;
479 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
480 if (chan->center_freq == freq)
484 if (!chandef->center_freq2)
487 for (freq = chandef->center_freq2 - width / 2 + 10;
488 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
489 if (chan->center_freq == freq)
496 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
500 ASSERT_WDEV_LOCK(wdev);
502 if (!wdev->chandef.chan)
505 switch (wdev->iftype) {
506 case NL80211_IFTYPE_AP:
507 case NL80211_IFTYPE_P2P_GO:
508 active = wdev->beacon_interval != 0;
510 case NL80211_IFTYPE_ADHOC:
511 active = wdev->ssid_len != 0;
513 case NL80211_IFTYPE_MESH_POINT:
514 active = wdev->mesh_id_len != 0;
516 case NL80211_IFTYPE_STATION:
517 case NL80211_IFTYPE_OCB:
518 case NL80211_IFTYPE_P2P_CLIENT:
519 case NL80211_IFTYPE_MONITOR:
520 case NL80211_IFTYPE_AP_VLAN:
521 case NL80211_IFTYPE_WDS:
522 case NL80211_IFTYPE_P2P_DEVICE:
523 /* Can NAN type be considered as beaconing interface? */
524 case NL80211_IFTYPE_NAN:
526 case NL80211_IFTYPE_UNSPECIFIED:
527 case NUM_NL80211_IFTYPES:
534 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
535 struct ieee80211_channel *chan)
537 struct wireless_dev *wdev;
539 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
541 if (!cfg80211_beaconing_iface_active(wdev)) {
546 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
556 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
557 struct ieee80211_channel *chan)
559 struct cfg80211_registered_device *rdev;
563 if (!(chan->flags & IEEE80211_CHAN_RADAR))
566 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
567 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
570 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
577 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
581 struct ieee80211_channel *c;
582 u32 freq, start_freq, end_freq;
584 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
585 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
588 * Check entire range of channels for the bandwidth.
589 * If any channel in between is disabled or has not
590 * had gone through CAC return false
592 for (freq = start_freq; freq <= end_freq; freq += 20) {
593 c = ieee80211_get_channel(wiphy, freq);
597 if (c->flags & IEEE80211_CHAN_DISABLED)
600 if ((c->flags & IEEE80211_CHAN_RADAR) &&
601 (c->dfs_state != NL80211_DFS_AVAILABLE))
608 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
609 const struct cfg80211_chan_def *chandef)
614 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
617 width = cfg80211_chandef_get_width(chandef);
621 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
624 /* If any of channels unavailable for cf1 just return */
628 switch (chandef->width) {
629 case NL80211_CHAN_WIDTH_80P80:
630 WARN_ON(!chandef->center_freq2);
631 r = cfg80211_get_chans_dfs_available(wiphy,
632 chandef->center_freq2,
636 WARN_ON(chandef->center_freq2);
643 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
647 struct ieee80211_channel *c;
648 u32 start_freq, end_freq, freq;
649 unsigned int dfs_cac_ms = 0;
651 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
652 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
654 for (freq = start_freq; freq <= end_freq; freq += 20) {
655 c = ieee80211_get_channel(wiphy, freq);
659 if (c->flags & IEEE80211_CHAN_DISABLED)
662 if (!(c->flags & IEEE80211_CHAN_RADAR))
665 if (c->dfs_cac_ms > dfs_cac_ms)
666 dfs_cac_ms = c->dfs_cac_ms;
673 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
674 const struct cfg80211_chan_def *chandef)
677 unsigned int t1 = 0, t2 = 0;
679 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
682 width = cfg80211_chandef_get_width(chandef);
686 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
687 chandef->center_freq1,
690 if (!chandef->center_freq2)
693 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
694 chandef->center_freq2,
700 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
701 u32 center_freq, u32 bandwidth,
702 u32 prohibited_flags)
704 struct ieee80211_channel *c;
705 u32 freq, start_freq, end_freq;
707 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
708 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
710 for (freq = start_freq; freq <= end_freq; freq += 20) {
711 c = ieee80211_get_channel(wiphy, freq);
712 if (!c || c->flags & prohibited_flags)
719 bool cfg80211_chandef_usable(struct wiphy *wiphy,
720 const struct cfg80211_chan_def *chandef,
721 u32 prohibited_flags)
723 struct ieee80211_sta_ht_cap *ht_cap;
724 struct ieee80211_sta_vht_cap *vht_cap;
725 u32 width, control_freq, cap;
727 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
730 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
731 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
733 control_freq = chandef->chan->center_freq;
735 switch (chandef->width) {
736 case NL80211_CHAN_WIDTH_5:
739 case NL80211_CHAN_WIDTH_10:
740 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
743 case NL80211_CHAN_WIDTH_20:
744 if (!ht_cap->ht_supported)
746 case NL80211_CHAN_WIDTH_20_NOHT:
747 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
750 case NL80211_CHAN_WIDTH_40:
752 if (!ht_cap->ht_supported)
754 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
755 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
757 if (chandef->center_freq1 < control_freq &&
758 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
760 if (chandef->center_freq1 > control_freq &&
761 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
764 case NL80211_CHAN_WIDTH_80P80:
765 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
766 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
768 case NL80211_CHAN_WIDTH_80:
769 if (!vht_cap->vht_supported)
771 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
774 case NL80211_CHAN_WIDTH_160:
775 if (!vht_cap->vht_supported)
777 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
778 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
779 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
781 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
790 * TODO: What if there are only certain 80/160/80+80 MHz channels
791 * allowed by the driver, or only certain combinations?
792 * For 40 MHz the driver can set the NO_HT40 flags, but for
793 * 80/160 MHz and in particular 80+80 MHz this isn't really
794 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
795 * no way to cover 80+80 MHz or more complex restrictions.
796 * Note that such restrictions also need to be advertised to
797 * userspace, for example for P2P channel selection.
801 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
803 /* 5 and 10 MHz are only defined for the OFDM PHY */
805 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
808 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
809 width, prohibited_flags))
812 if (!chandef->center_freq2)
814 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
815 width, prohibited_flags);
817 EXPORT_SYMBOL(cfg80211_chandef_usable);
820 * Check if the channel can be used under permissive conditions mandated by
821 * some regulatory bodies, i.e., the channel is marked with
822 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
823 * associated to an AP on the same channel or on the same UNII band
824 * (assuming that the AP is an authorized master).
825 * In addition allow operation on a channel on which indoor operation is
826 * allowed, iff we are currently operating in an indoor environment.
828 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
829 enum nl80211_iftype iftype,
830 struct ieee80211_channel *chan)
832 struct wireless_dev *wdev;
833 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
837 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
838 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
841 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
842 if (iftype != NL80211_IFTYPE_P2P_GO &&
843 iftype != NL80211_IFTYPE_STATION &&
844 iftype != NL80211_IFTYPE_P2P_CLIENT)
847 if (regulatory_indoor_allowed() &&
848 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
851 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
855 * Generally, it is possible to rely on another device/driver to allow
856 * the IR concurrent relaxation, however, since the device can further
857 * enforce the relaxation (by doing a similar verifications as this),
858 * and thus fail the GO instantiation, consider only the interfaces of
859 * the current registered device.
861 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
862 struct ieee80211_channel *other_chan = NULL;
866 if (wdev->iftype == NL80211_IFTYPE_STATION &&
868 other_chan = wdev->current_bss->pub.channel;
871 * If a GO already operates on the same GO_CONCURRENT channel,
872 * this one (maybe the same one) can beacon as well. We allow
873 * the operation even if the station we relied on with
874 * GO_CONCURRENT is disconnected now. But then we must make sure
875 * we're not outdoor on an indoor-only channel.
877 if (iftype == NL80211_IFTYPE_P2P_GO &&
878 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
879 wdev->beacon_interval &&
880 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
881 other_chan = wdev->chandef.chan;
887 if (chan == other_chan)
890 if (chan->band != NL80211_BAND_5GHZ)
893 r1 = cfg80211_get_unii(chan->center_freq);
894 r2 = cfg80211_get_unii(other_chan->center_freq);
896 if (r1 != -EINVAL && r1 == r2) {
898 * At some locations channels 149-165 are considered a
899 * bundle, but at other locations, e.g., Indonesia,
900 * channels 149-161 are considered a bundle while
901 * channel 165 is left out and considered to be in a
902 * different bundle. Thus, in case that there is a
903 * station interface connected to an AP on channel 165,
904 * it is assumed that channels 149-161 are allowed for
905 * GO operations. However, having a station interface
906 * connected to an AP on channels 149-161, does not
907 * allow GO operation on channel 165.
909 if (chan->center_freq == 5825 &&
910 other_chan->center_freq != 5825)
919 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
920 struct cfg80211_chan_def *chandef,
921 enum nl80211_iftype iftype,
925 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
926 IEEE80211_CHAN_RADAR;
928 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
931 prohibited_flags |= IEEE80211_CHAN_NO_IR;
933 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
934 cfg80211_chandef_dfs_available(wiphy, chandef)) {
935 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
936 prohibited_flags = IEEE80211_CHAN_DISABLED;
939 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
941 trace_cfg80211_return_bool(res);
945 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
946 struct cfg80211_chan_def *chandef,
947 enum nl80211_iftype iftype)
949 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
951 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
953 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
954 struct cfg80211_chan_def *chandef,
955 enum nl80211_iftype iftype)
962 * Under certain conditions suggested by some regulatory bodies a
963 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
964 * only if such relaxations are not enabled and the conditions are not
967 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
970 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
972 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
974 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
975 struct cfg80211_chan_def *chandef)
977 if (!rdev->ops->set_monitor_channel)
979 if (!cfg80211_has_monitors_only(rdev))
982 return rdev_set_monitor_channel(rdev, chandef);
986 cfg80211_get_chan_state(struct wireless_dev *wdev,
987 struct ieee80211_channel **chan,
988 enum cfg80211_chan_mode *chanmode,
994 *chanmode = CHAN_MODE_UNDEFINED;
996 ASSERT_WDEV_LOCK(wdev);
998 if (wdev->netdev && !netif_running(wdev->netdev))
1001 switch (wdev->iftype) {
1002 case NL80211_IFTYPE_ADHOC:
1003 if (wdev->current_bss) {
1004 *chan = wdev->current_bss->pub.channel;
1005 *chanmode = (wdev->ibss_fixed &&
1006 !wdev->ibss_dfs_possible)
1008 : CHAN_MODE_EXCLUSIVE;
1010 /* consider worst-case - IBSS can try to return to the
1011 * original user-specified channel as creator */
1012 if (wdev->ibss_dfs_possible)
1013 *radar_detect |= BIT(wdev->chandef.width);
1017 case NL80211_IFTYPE_STATION:
1018 case NL80211_IFTYPE_P2P_CLIENT:
1019 if (wdev->current_bss) {
1020 *chan = wdev->current_bss->pub.channel;
1021 *chanmode = CHAN_MODE_SHARED;
1025 case NL80211_IFTYPE_AP:
1026 case NL80211_IFTYPE_P2P_GO:
1027 if (wdev->cac_started) {
1028 *chan = wdev->chandef.chan;
1029 *chanmode = CHAN_MODE_SHARED;
1030 *radar_detect |= BIT(wdev->chandef.width);
1031 } else if (wdev->beacon_interval) {
1032 *chan = wdev->chandef.chan;
1033 *chanmode = CHAN_MODE_SHARED;
1035 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1040 *radar_detect |= BIT(wdev->chandef.width);
1043 case NL80211_IFTYPE_MESH_POINT:
1044 if (wdev->mesh_id_len) {
1045 *chan = wdev->chandef.chan;
1046 *chanmode = CHAN_MODE_SHARED;
1048 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1053 *radar_detect |= BIT(wdev->chandef.width);
1056 case NL80211_IFTYPE_OCB:
1057 if (wdev->chandef.chan) {
1058 *chan = wdev->chandef.chan;
1059 *chanmode = CHAN_MODE_SHARED;
1063 case NL80211_IFTYPE_MONITOR:
1064 case NL80211_IFTYPE_AP_VLAN:
1065 case NL80211_IFTYPE_WDS:
1066 case NL80211_IFTYPE_P2P_DEVICE:
1067 case NL80211_IFTYPE_NAN:
1068 /* these interface types don't really have a channel */
1070 case NL80211_IFTYPE_UNSPECIFIED:
1071 case NUM_NL80211_IFTYPES: