1 // SPDX-License-Identifier: GPL-2.0
3 * This file contains helper code to handle channel
4 * settings and keeping track of what is possible at
7 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
8 * Copyright 2013-2014 Intel Mobile Communications GmbH
11 #include <linux/export.h>
12 #include <net/cfg80211.h>
16 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
17 struct ieee80211_channel *chan,
18 enum nl80211_channel_type chan_type)
24 chandef->center_freq2 = 0;
27 case NL80211_CHAN_NO_HT:
28 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
29 chandef->center_freq1 = chan->center_freq;
31 case NL80211_CHAN_HT20:
32 chandef->width = NL80211_CHAN_WIDTH_20;
33 chandef->center_freq1 = chan->center_freq;
35 case NL80211_CHAN_HT40PLUS:
36 chandef->width = NL80211_CHAN_WIDTH_40;
37 chandef->center_freq1 = chan->center_freq + 10;
39 case NL80211_CHAN_HT40MINUS:
40 chandef->width = NL80211_CHAN_WIDTH_40;
41 chandef->center_freq1 = chan->center_freq - 10;
47 EXPORT_SYMBOL(cfg80211_chandef_create);
49 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
56 control_freq = chandef->chan->center_freq;
58 switch (chandef->width) {
59 case NL80211_CHAN_WIDTH_5:
60 case NL80211_CHAN_WIDTH_10:
61 case NL80211_CHAN_WIDTH_20:
62 case NL80211_CHAN_WIDTH_20_NOHT:
63 if (chandef->center_freq1 != control_freq)
65 if (chandef->center_freq2)
68 case NL80211_CHAN_WIDTH_40:
69 if (chandef->center_freq1 != control_freq + 10 &&
70 chandef->center_freq1 != control_freq - 10)
72 if (chandef->center_freq2)
75 case NL80211_CHAN_WIDTH_80P80:
76 if (chandef->center_freq1 != control_freq + 30 &&
77 chandef->center_freq1 != control_freq + 10 &&
78 chandef->center_freq1 != control_freq - 10 &&
79 chandef->center_freq1 != control_freq - 30)
81 if (!chandef->center_freq2)
83 /* adjacent is not allowed -- that's a 160 MHz channel */
84 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
85 chandef->center_freq2 - chandef->center_freq1 == 80)
88 case NL80211_CHAN_WIDTH_80:
89 if (chandef->center_freq1 != control_freq + 30 &&
90 chandef->center_freq1 != control_freq + 10 &&
91 chandef->center_freq1 != control_freq - 10 &&
92 chandef->center_freq1 != control_freq - 30)
94 if (chandef->center_freq2)
97 case NL80211_CHAN_WIDTH_160:
98 if (chandef->center_freq1 != control_freq + 70 &&
99 chandef->center_freq1 != control_freq + 50 &&
100 chandef->center_freq1 != control_freq + 30 &&
101 chandef->center_freq1 != control_freq + 10 &&
102 chandef->center_freq1 != control_freq - 10 &&
103 chandef->center_freq1 != control_freq - 30 &&
104 chandef->center_freq1 != control_freq - 50 &&
105 chandef->center_freq1 != control_freq - 70)
107 if (chandef->center_freq2)
116 EXPORT_SYMBOL(cfg80211_chandef_valid);
118 static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
119 u32 *pri40, u32 *pri80)
124 case NL80211_CHAN_WIDTH_40:
125 *pri40 = c->center_freq1;
128 case NL80211_CHAN_WIDTH_80:
129 case NL80211_CHAN_WIDTH_80P80:
130 *pri80 = c->center_freq1;
132 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
136 *pri40 = c->center_freq1 - 20 + 40 * tmp;
138 case NL80211_CHAN_WIDTH_160:
140 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
144 *pri40 = c->center_freq1 - 60 + 40 * tmp;
147 *pri80 = c->center_freq1 - 40 + 80 * tmp;
154 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
159 case NL80211_CHAN_WIDTH_5:
162 case NL80211_CHAN_WIDTH_10:
165 case NL80211_CHAN_WIDTH_20:
166 case NL80211_CHAN_WIDTH_20_NOHT:
169 case NL80211_CHAN_WIDTH_40:
172 case NL80211_CHAN_WIDTH_80P80:
173 case NL80211_CHAN_WIDTH_80:
176 case NL80211_CHAN_WIDTH_160:
186 const struct cfg80211_chan_def *
187 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
188 const struct cfg80211_chan_def *c2)
190 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
192 /* If they are identical, return */
193 if (cfg80211_chandef_identical(c1, c2))
196 /* otherwise, must have same control channel */
197 if (c1->chan != c2->chan)
201 * If they have the same width, but aren't identical,
202 * then they can't be compatible.
204 if (c1->width == c2->width)
208 * can't be compatible if one of them is 5 or 10 MHz,
209 * but they don't have the same width.
211 if (c1->width == NL80211_CHAN_WIDTH_5 ||
212 c1->width == NL80211_CHAN_WIDTH_10 ||
213 c2->width == NL80211_CHAN_WIDTH_5 ||
214 c2->width == NL80211_CHAN_WIDTH_10)
217 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
218 c1->width == NL80211_CHAN_WIDTH_20)
221 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
222 c2->width == NL80211_CHAN_WIDTH_20)
225 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
226 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
228 if (c1_pri40 != c2_pri40)
231 WARN_ON(!c1_pri80 && !c2_pri80);
232 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
235 if (c1->width > c2->width)
239 EXPORT_SYMBOL(cfg80211_chandef_compatible);
241 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
243 enum nl80211_dfs_state dfs_state)
245 struct ieee80211_channel *c;
248 for (freq = center_freq - bandwidth/2 + 10;
249 freq <= center_freq + bandwidth/2 - 10;
251 c = ieee80211_get_channel(wiphy, freq);
252 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
255 c->dfs_state = dfs_state;
256 c->dfs_state_entered = jiffies;
260 void cfg80211_set_dfs_state(struct wiphy *wiphy,
261 const struct cfg80211_chan_def *chandef,
262 enum nl80211_dfs_state dfs_state)
266 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
269 width = cfg80211_chandef_get_width(chandef);
273 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
276 if (!chandef->center_freq2)
278 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
282 static u32 cfg80211_get_start_freq(u32 center_freq,
288 start_freq = center_freq;
290 start_freq = center_freq - bandwidth/2 + 10;
295 static u32 cfg80211_get_end_freq(u32 center_freq,
301 end_freq = center_freq;
303 end_freq = center_freq + bandwidth/2 - 10;
308 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
312 struct ieee80211_channel *c;
313 u32 freq, start_freq, end_freq;
315 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
316 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
318 for (freq = start_freq; freq <= end_freq; freq += 20) {
319 c = ieee80211_get_channel(wiphy, freq);
323 if (c->flags & IEEE80211_CHAN_RADAR)
330 int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
331 const struct cfg80211_chan_def *chandef,
332 enum nl80211_iftype iftype)
337 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
341 case NL80211_IFTYPE_ADHOC:
342 case NL80211_IFTYPE_AP:
343 case NL80211_IFTYPE_P2P_GO:
344 case NL80211_IFTYPE_MESH_POINT:
345 width = cfg80211_chandef_get_width(chandef);
349 ret = cfg80211_get_chans_dfs_required(wiphy,
350 chandef->center_freq1,
355 return BIT(chandef->width);
357 if (!chandef->center_freq2)
360 ret = cfg80211_get_chans_dfs_required(wiphy,
361 chandef->center_freq2,
366 return BIT(chandef->width);
369 case NL80211_IFTYPE_STATION:
370 case NL80211_IFTYPE_OCB:
371 case NL80211_IFTYPE_P2P_CLIENT:
372 case NL80211_IFTYPE_MONITOR:
373 case NL80211_IFTYPE_AP_VLAN:
374 case NL80211_IFTYPE_WDS:
375 case NL80211_IFTYPE_P2P_DEVICE:
376 case NL80211_IFTYPE_NAN:
378 case NL80211_IFTYPE_UNSPECIFIED:
379 case NUM_NL80211_IFTYPES:
385 EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
387 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
391 struct ieee80211_channel *c;
392 u32 freq, start_freq, end_freq;
395 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
396 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
399 * Check entire range of channels for the bandwidth.
400 * Check all channels are DFS channels (DFS_USABLE or
401 * DFS_AVAILABLE). Return number of usable channels
402 * (require CAC). Allow DFS and non-DFS channel mix.
404 for (freq = start_freq; freq <= end_freq; freq += 20) {
405 c = ieee80211_get_channel(wiphy, freq);
409 if (c->flags & IEEE80211_CHAN_DISABLED)
412 if (c->flags & IEEE80211_CHAN_RADAR) {
413 if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
416 if (c->dfs_state == NL80211_DFS_USABLE)
424 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
425 const struct cfg80211_chan_def *chandef)
430 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
433 width = cfg80211_chandef_get_width(chandef);
437 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
443 switch (chandef->width) {
444 case NL80211_CHAN_WIDTH_80P80:
445 WARN_ON(!chandef->center_freq2);
446 r2 = cfg80211_get_chans_dfs_usable(wiphy,
447 chandef->center_freq2,
453 WARN_ON(chandef->center_freq2);
457 return (r1 + r2 > 0);
461 * Checks if center frequency of chan falls with in the bandwidth
464 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
465 struct ieee80211_channel *chan)
470 if (chandef->chan->center_freq == chan->center_freq)
473 width = cfg80211_chandef_get_width(chandef);
477 cf_offset = width / 2 - 10;
479 for (freq = chandef->center_freq1 - width / 2 + 10;
480 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
481 if (chan->center_freq == freq)
485 if (!chandef->center_freq2)
488 for (freq = chandef->center_freq2 - width / 2 + 10;
489 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
490 if (chan->center_freq == freq)
497 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
501 ASSERT_WDEV_LOCK(wdev);
503 if (!wdev->chandef.chan)
506 switch (wdev->iftype) {
507 case NL80211_IFTYPE_AP:
508 case NL80211_IFTYPE_P2P_GO:
509 active = wdev->beacon_interval != 0;
511 case NL80211_IFTYPE_ADHOC:
512 active = wdev->ssid_len != 0;
514 case NL80211_IFTYPE_MESH_POINT:
515 active = wdev->mesh_id_len != 0;
517 case NL80211_IFTYPE_STATION:
518 case NL80211_IFTYPE_OCB:
519 case NL80211_IFTYPE_P2P_CLIENT:
520 case NL80211_IFTYPE_MONITOR:
521 case NL80211_IFTYPE_AP_VLAN:
522 case NL80211_IFTYPE_WDS:
523 case NL80211_IFTYPE_P2P_DEVICE:
524 /* Can NAN type be considered as beaconing interface? */
525 case NL80211_IFTYPE_NAN:
527 case NL80211_IFTYPE_UNSPECIFIED:
528 case NUM_NL80211_IFTYPES:
535 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
536 struct ieee80211_channel *chan)
538 struct wireless_dev *wdev;
540 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
542 if (!cfg80211_beaconing_iface_active(wdev)) {
547 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
557 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
558 struct ieee80211_channel *chan)
560 struct cfg80211_registered_device *rdev;
564 if (!(chan->flags & IEEE80211_CHAN_RADAR))
567 list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
568 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
571 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
578 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
582 struct ieee80211_channel *c;
583 u32 freq, start_freq, end_freq;
585 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
586 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
589 * Check entire range of channels for the bandwidth.
590 * If any channel in between is disabled or has not
591 * had gone through CAC return false
593 for (freq = start_freq; freq <= end_freq; freq += 20) {
594 c = ieee80211_get_channel(wiphy, freq);
598 if (c->flags & IEEE80211_CHAN_DISABLED)
601 if ((c->flags & IEEE80211_CHAN_RADAR) &&
602 (c->dfs_state != NL80211_DFS_AVAILABLE))
609 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
610 const struct cfg80211_chan_def *chandef)
615 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
618 width = cfg80211_chandef_get_width(chandef);
622 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
625 /* If any of channels unavailable for cf1 just return */
629 switch (chandef->width) {
630 case NL80211_CHAN_WIDTH_80P80:
631 WARN_ON(!chandef->center_freq2);
632 r = cfg80211_get_chans_dfs_available(wiphy,
633 chandef->center_freq2,
637 WARN_ON(chandef->center_freq2);
644 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
648 struct ieee80211_channel *c;
649 u32 start_freq, end_freq, freq;
650 unsigned int dfs_cac_ms = 0;
652 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
653 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
655 for (freq = start_freq; freq <= end_freq; freq += 20) {
656 c = ieee80211_get_channel(wiphy, freq);
660 if (c->flags & IEEE80211_CHAN_DISABLED)
663 if (!(c->flags & IEEE80211_CHAN_RADAR))
666 if (c->dfs_cac_ms > dfs_cac_ms)
667 dfs_cac_ms = c->dfs_cac_ms;
674 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
675 const struct cfg80211_chan_def *chandef)
678 unsigned int t1 = 0, t2 = 0;
680 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
683 width = cfg80211_chandef_get_width(chandef);
687 t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
688 chandef->center_freq1,
691 if (!chandef->center_freq2)
694 t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
695 chandef->center_freq2,
701 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
702 u32 center_freq, u32 bandwidth,
703 u32 prohibited_flags)
705 struct ieee80211_channel *c;
706 u32 freq, start_freq, end_freq;
708 start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
709 end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
711 for (freq = start_freq; freq <= end_freq; freq += 20) {
712 c = ieee80211_get_channel(wiphy, freq);
713 if (!c || c->flags & prohibited_flags)
720 bool cfg80211_chandef_usable(struct wiphy *wiphy,
721 const struct cfg80211_chan_def *chandef,
722 u32 prohibited_flags)
724 struct ieee80211_sta_ht_cap *ht_cap;
725 struct ieee80211_sta_vht_cap *vht_cap;
726 u32 width, control_freq, cap;
728 if (WARN_ON(!cfg80211_chandef_valid(chandef)))
731 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
732 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
734 control_freq = chandef->chan->center_freq;
736 switch (chandef->width) {
737 case NL80211_CHAN_WIDTH_5:
740 case NL80211_CHAN_WIDTH_10:
741 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
744 case NL80211_CHAN_WIDTH_20:
745 if (!ht_cap->ht_supported)
747 case NL80211_CHAN_WIDTH_20_NOHT:
748 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
751 case NL80211_CHAN_WIDTH_40:
753 if (!ht_cap->ht_supported)
755 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
756 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
758 if (chandef->center_freq1 < control_freq &&
759 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
761 if (chandef->center_freq1 > control_freq &&
762 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
765 case NL80211_CHAN_WIDTH_80P80:
766 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
767 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
769 case NL80211_CHAN_WIDTH_80:
770 if (!vht_cap->vht_supported)
772 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
775 case NL80211_CHAN_WIDTH_160:
776 if (!vht_cap->vht_supported)
778 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
779 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
780 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
782 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
791 * TODO: What if there are only certain 80/160/80+80 MHz channels
792 * allowed by the driver, or only certain combinations?
793 * For 40 MHz the driver can set the NO_HT40 flags, but for
794 * 80/160 MHz and in particular 80+80 MHz this isn't really
795 * feasible and we only have NO_80MHZ/NO_160MHZ so far but
796 * no way to cover 80+80 MHz or more complex restrictions.
797 * Note that such restrictions also need to be advertised to
798 * userspace, for example for P2P channel selection.
802 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
804 /* 5 and 10 MHz are only defined for the OFDM PHY */
806 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
809 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
810 width, prohibited_flags))
813 if (!chandef->center_freq2)
815 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
816 width, prohibited_flags);
818 EXPORT_SYMBOL(cfg80211_chandef_usable);
821 * Check if the channel can be used under permissive conditions mandated by
822 * some regulatory bodies, i.e., the channel is marked with
823 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
824 * associated to an AP on the same channel or on the same UNII band
825 * (assuming that the AP is an authorized master).
826 * In addition allow operation on a channel on which indoor operation is
827 * allowed, iff we are currently operating in an indoor environment.
829 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
830 enum nl80211_iftype iftype,
831 struct ieee80211_channel *chan)
833 struct wireless_dev *wdev;
834 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
838 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
839 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
842 /* only valid for GO and TDLS off-channel (station/p2p-CL) */
843 if (iftype != NL80211_IFTYPE_P2P_GO &&
844 iftype != NL80211_IFTYPE_STATION &&
845 iftype != NL80211_IFTYPE_P2P_CLIENT)
848 if (regulatory_indoor_allowed() &&
849 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
852 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
856 * Generally, it is possible to rely on another device/driver to allow
857 * the IR concurrent relaxation, however, since the device can further
858 * enforce the relaxation (by doing a similar verifications as this),
859 * and thus fail the GO instantiation, consider only the interfaces of
860 * the current registered device.
862 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
863 struct ieee80211_channel *other_chan = NULL;
867 if (wdev->iftype == NL80211_IFTYPE_STATION &&
869 other_chan = wdev->current_bss->pub.channel;
872 * If a GO already operates on the same GO_CONCURRENT channel,
873 * this one (maybe the same one) can beacon as well. We allow
874 * the operation even if the station we relied on with
875 * GO_CONCURRENT is disconnected now. But then we must make sure
876 * we're not outdoor on an indoor-only channel.
878 if (iftype == NL80211_IFTYPE_P2P_GO &&
879 wdev->iftype == NL80211_IFTYPE_P2P_GO &&
880 wdev->beacon_interval &&
881 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
882 other_chan = wdev->chandef.chan;
888 if (chan == other_chan)
891 if (chan->band != NL80211_BAND_5GHZ)
894 r1 = cfg80211_get_unii(chan->center_freq);
895 r2 = cfg80211_get_unii(other_chan->center_freq);
897 if (r1 != -EINVAL && r1 == r2) {
899 * At some locations channels 149-165 are considered a
900 * bundle, but at other locations, e.g., Indonesia,
901 * channels 149-161 are considered a bundle while
902 * channel 165 is left out and considered to be in a
903 * different bundle. Thus, in case that there is a
904 * station interface connected to an AP on channel 165,
905 * it is assumed that channels 149-161 are allowed for
906 * GO operations. However, having a station interface
907 * connected to an AP on channels 149-161, does not
908 * allow GO operation on channel 165.
910 if (chan->center_freq == 5825 &&
911 other_chan->center_freq != 5825)
920 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
921 struct cfg80211_chan_def *chandef,
922 enum nl80211_iftype iftype,
926 u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
927 IEEE80211_CHAN_RADAR;
929 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
932 prohibited_flags |= IEEE80211_CHAN_NO_IR;
934 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
935 cfg80211_chandef_dfs_available(wiphy, chandef)) {
936 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
937 prohibited_flags = IEEE80211_CHAN_DISABLED;
940 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
942 trace_cfg80211_return_bool(res);
946 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
947 struct cfg80211_chan_def *chandef,
948 enum nl80211_iftype iftype)
950 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
952 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
954 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
955 struct cfg80211_chan_def *chandef,
956 enum nl80211_iftype iftype)
963 * Under certain conditions suggested by some regulatory bodies a
964 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
965 * only if such relaxations are not enabled and the conditions are not
968 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
971 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
973 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
975 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
976 struct cfg80211_chan_def *chandef)
978 if (!rdev->ops->set_monitor_channel)
980 if (!cfg80211_has_monitors_only(rdev))
983 return rdev_set_monitor_channel(rdev, chandef);
987 cfg80211_get_chan_state(struct wireless_dev *wdev,
988 struct ieee80211_channel **chan,
989 enum cfg80211_chan_mode *chanmode,
995 *chanmode = CHAN_MODE_UNDEFINED;
997 ASSERT_WDEV_LOCK(wdev);
999 if (wdev->netdev && !netif_running(wdev->netdev))
1002 switch (wdev->iftype) {
1003 case NL80211_IFTYPE_ADHOC:
1004 if (wdev->current_bss) {
1005 *chan = wdev->current_bss->pub.channel;
1006 *chanmode = (wdev->ibss_fixed &&
1007 !wdev->ibss_dfs_possible)
1009 : CHAN_MODE_EXCLUSIVE;
1011 /* consider worst-case - IBSS can try to return to the
1012 * original user-specified channel as creator */
1013 if (wdev->ibss_dfs_possible)
1014 *radar_detect |= BIT(wdev->chandef.width);
1018 case NL80211_IFTYPE_STATION:
1019 case NL80211_IFTYPE_P2P_CLIENT:
1020 if (wdev->current_bss) {
1021 *chan = wdev->current_bss->pub.channel;
1022 *chanmode = CHAN_MODE_SHARED;
1026 case NL80211_IFTYPE_AP:
1027 case NL80211_IFTYPE_P2P_GO:
1028 if (wdev->cac_started) {
1029 *chan = wdev->chandef.chan;
1030 *chanmode = CHAN_MODE_SHARED;
1031 *radar_detect |= BIT(wdev->chandef.width);
1032 } else if (wdev->beacon_interval) {
1033 *chan = wdev->chandef.chan;
1034 *chanmode = CHAN_MODE_SHARED;
1036 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1041 *radar_detect |= BIT(wdev->chandef.width);
1044 case NL80211_IFTYPE_MESH_POINT:
1045 if (wdev->mesh_id_len) {
1046 *chan = wdev->chandef.chan;
1047 *chanmode = CHAN_MODE_SHARED;
1049 ret = cfg80211_chandef_dfs_required(wdev->wiphy,
1054 *radar_detect |= BIT(wdev->chandef.width);
1057 case NL80211_IFTYPE_OCB:
1058 if (wdev->chandef.chan) {
1059 *chan = wdev->chandef.chan;
1060 *chanmode = CHAN_MODE_SHARED;
1064 case NL80211_IFTYPE_MONITOR:
1065 case NL80211_IFTYPE_AP_VLAN:
1066 case NL80211_IFTYPE_WDS:
1067 case NL80211_IFTYPE_P2P_DEVICE:
1068 case NL80211_IFTYPE_NAN:
1069 /* these interface types don't really have a channel */
1071 case NL80211_IFTYPE_UNSPECIFIED:
1072 case NUM_NL80211_IFTYPES: