v4.19.13 snapshot.
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
new file mode 100644
index 0000000..2db713d
--- /dev/null
+++ b/net/wireless/chan.c
@@ -0,0 +1,1078 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This file contains helper code to handle channel
+ * settings and keeping track of what is possible at
+ * any point in time.
+ *
+ * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014 Intel Mobile Communications GmbH
+ */
+
+#include <linux/export.h>
+#include <net/cfg80211.h>
+#include "core.h"
+#include "rdev-ops.h"
+
+void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
+ struct ieee80211_channel *chan,
+ enum nl80211_channel_type chan_type)
+{
+ if (WARN_ON(!chan))
+ return;
+
+ chandef->chan = chan;
+ chandef->center_freq2 = 0;
+
+ switch (chan_type) {
+ case NL80211_CHAN_NO_HT:
+ chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
+ chandef->center_freq1 = chan->center_freq;
+ break;
+ case NL80211_CHAN_HT20:
+ chandef->width = NL80211_CHAN_WIDTH_20;
+ chandef->center_freq1 = chan->center_freq;
+ break;
+ case NL80211_CHAN_HT40PLUS:
+ chandef->width = NL80211_CHAN_WIDTH_40;
+ chandef->center_freq1 = chan->center_freq + 10;
+ break;
+ case NL80211_CHAN_HT40MINUS:
+ chandef->width = NL80211_CHAN_WIDTH_40;
+ chandef->center_freq1 = chan->center_freq - 10;
+ break;
+ default:
+ WARN_ON(1);
+ }
+}
+EXPORT_SYMBOL(cfg80211_chandef_create);
+
+bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
+{
+ u32 control_freq;
+
+ if (!chandef->chan)
+ return false;
+
+ control_freq = chandef->chan->center_freq;
+
+ switch (chandef->width) {
+ case NL80211_CHAN_WIDTH_5:
+ case NL80211_CHAN_WIDTH_10:
+ case NL80211_CHAN_WIDTH_20:
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ if (chandef->center_freq1 != control_freq)
+ return false;
+ if (chandef->center_freq2)
+ return false;
+ break;
+ case NL80211_CHAN_WIDTH_40:
+ if (chandef->center_freq1 != control_freq + 10 &&
+ chandef->center_freq1 != control_freq - 10)
+ return false;
+ if (chandef->center_freq2)
+ return false;
+ break;
+ case NL80211_CHAN_WIDTH_80P80:
+ if (chandef->center_freq1 != control_freq + 30 &&
+ chandef->center_freq1 != control_freq + 10 &&
+ chandef->center_freq1 != control_freq - 10 &&
+ chandef->center_freq1 != control_freq - 30)
+ return false;
+ if (!chandef->center_freq2)
+ return false;
+ /* adjacent is not allowed -- that's a 160 MHz channel */
+ if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
+ chandef->center_freq2 - chandef->center_freq1 == 80)
+ return false;
+ break;
+ case NL80211_CHAN_WIDTH_80:
+ if (chandef->center_freq1 != control_freq + 30 &&
+ chandef->center_freq1 != control_freq + 10 &&
+ chandef->center_freq1 != control_freq - 10 &&
+ chandef->center_freq1 != control_freq - 30)
+ return false;
+ if (chandef->center_freq2)
+ return false;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ if (chandef->center_freq1 != control_freq + 70 &&
+ chandef->center_freq1 != control_freq + 50 &&
+ chandef->center_freq1 != control_freq + 30 &&
+ chandef->center_freq1 != control_freq + 10 &&
+ chandef->center_freq1 != control_freq - 10 &&
+ chandef->center_freq1 != control_freq - 30 &&
+ chandef->center_freq1 != control_freq - 50 &&
+ chandef->center_freq1 != control_freq - 70)
+ return false;
+ if (chandef->center_freq2)
+ return false;
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(cfg80211_chandef_valid);
+
+static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
+ u32 *pri40, u32 *pri80)
+{
+ int tmp;
+
+ switch (c->width) {
+ case NL80211_CHAN_WIDTH_40:
+ *pri40 = c->center_freq1;
+ *pri80 = 0;
+ break;
+ case NL80211_CHAN_WIDTH_80:
+ case NL80211_CHAN_WIDTH_80P80:
+ *pri80 = c->center_freq1;
+ /* n_P20 */
+ tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
+ /* n_P40 */
+ tmp /= 2;
+ /* freq_P40 */
+ *pri40 = c->center_freq1 - 20 + 40 * tmp;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ /* n_P20 */
+ tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
+ /* n_P40 */
+ tmp /= 2;
+ /* freq_P40 */
+ *pri40 = c->center_freq1 - 60 + 40 * tmp;
+ /* n_P80 */
+ tmp /= 2;
+ *pri80 = c->center_freq1 - 40 + 80 * tmp;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ }
+}
+
+static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
+{
+ int width;
+
+ switch (c->width) {
+ case NL80211_CHAN_WIDTH_5:
+ width = 5;
+ break;
+ case NL80211_CHAN_WIDTH_10:
+ width = 10;
+ break;
+ case NL80211_CHAN_WIDTH_20:
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ width = 20;
+ break;
+ case NL80211_CHAN_WIDTH_40:
+ width = 40;
+ break;
+ case NL80211_CHAN_WIDTH_80P80:
+ case NL80211_CHAN_WIDTH_80:
+ width = 80;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ width = 160;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return -1;
+ }
+ return width;
+}
+
+const struct cfg80211_chan_def *
+cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
+ const struct cfg80211_chan_def *c2)
+{
+ u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
+
+ /* If they are identical, return */
+ if (cfg80211_chandef_identical(c1, c2))
+ return c1;
+
+ /* otherwise, must have same control channel */
+ if (c1->chan != c2->chan)
+ return NULL;
+
+ /*
+ * If they have the same width, but aren't identical,
+ * then they can't be compatible.
+ */
+ if (c1->width == c2->width)
+ return NULL;
+
+ /*
+ * can't be compatible if one of them is 5 or 10 MHz,
+ * but they don't have the same width.
+ */
+ if (c1->width == NL80211_CHAN_WIDTH_5 ||
+ c1->width == NL80211_CHAN_WIDTH_10 ||
+ c2->width == NL80211_CHAN_WIDTH_5 ||
+ c2->width == NL80211_CHAN_WIDTH_10)
+ return NULL;
+
+ if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
+ c1->width == NL80211_CHAN_WIDTH_20)
+ return c2;
+
+ if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
+ c2->width == NL80211_CHAN_WIDTH_20)
+ return c1;
+
+ chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
+ chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
+
+ if (c1_pri40 != c2_pri40)
+ return NULL;
+
+ WARN_ON(!c1_pri80 && !c2_pri80);
+ if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
+ return NULL;
+
+ if (c1->width > c2->width)
+ return c1;
+ return c2;
+}
+EXPORT_SYMBOL(cfg80211_chandef_compatible);
+
+static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
+ u32 bandwidth,
+ enum nl80211_dfs_state dfs_state)
+{
+ struct ieee80211_channel *c;
+ u32 freq;
+
+ for (freq = center_freq - bandwidth/2 + 10;
+ freq <= center_freq + bandwidth/2 - 10;
+ freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
+ continue;
+
+ c->dfs_state = dfs_state;
+ c->dfs_state_entered = jiffies;
+ }
+}
+
+void cfg80211_set_dfs_state(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef,
+ enum nl80211_dfs_state dfs_state)
+{
+ int width;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return;
+
+ cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
+ width, dfs_state);
+
+ if (!chandef->center_freq2)
+ return;
+ cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
+ width, dfs_state);
+}
+
+static u32 cfg80211_get_start_freq(u32 center_freq,
+ u32 bandwidth)
+{
+ u32 start_freq;
+
+ if (bandwidth <= 20)
+ start_freq = center_freq;
+ else
+ start_freq = center_freq - bandwidth/2 + 10;
+
+ return start_freq;
+}
+
+static u32 cfg80211_get_end_freq(u32 center_freq,
+ u32 bandwidth)
+{
+ u32 end_freq;
+
+ if (bandwidth <= 20)
+ end_freq = center_freq;
+ else
+ end_freq = center_freq + bandwidth/2 - 10;
+
+ return end_freq;
+}
+
+static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bandwidth)
+{
+ struct ieee80211_channel *c;
+ u32 freq, start_freq, end_freq;
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
+
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c)
+ return -EINVAL;
+
+ if (c->flags & IEEE80211_CHAN_RADAR)
+ return 1;
+ }
+ return 0;
+}
+
+
+int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef,
+ enum nl80211_iftype iftype)
+{
+ int width;
+ int ret;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return -EINVAL;
+
+ switch (iftype) {
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_P2P_GO:
+ case NL80211_IFTYPE_MESH_POINT:
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return -EINVAL;
+
+ ret = cfg80211_get_chans_dfs_required(wiphy,
+ chandef->center_freq1,
+ width);
+ if (ret < 0)
+ return ret;
+ else if (ret > 0)
+ return BIT(chandef->width);
+
+ if (!chandef->center_freq2)
+ return 0;
+
+ ret = cfg80211_get_chans_dfs_required(wiphy,
+ chandef->center_freq2,
+ width);
+ if (ret < 0)
+ return ret;
+ else if (ret > 0)
+ return BIT(chandef->width);
+
+ break;
+ case NL80211_IFTYPE_STATION:
+ case NL80211_IFTYPE_OCB:
+ case NL80211_IFTYPE_P2P_CLIENT:
+ case NL80211_IFTYPE_MONITOR:
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_WDS:
+ case NL80211_IFTYPE_P2P_DEVICE:
+ case NL80211_IFTYPE_NAN:
+ break;
+ case NL80211_IFTYPE_UNSPECIFIED:
+ case NUM_NL80211_IFTYPES:
+ WARN_ON(1);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
+
+static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bandwidth)
+{
+ struct ieee80211_channel *c;
+ u32 freq, start_freq, end_freq;
+ int count = 0;
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
+
+ /*
+ * Check entire range of channels for the bandwidth.
+ * Check all channels are DFS channels (DFS_USABLE or
+ * DFS_AVAILABLE). Return number of usable channels
+ * (require CAC). Allow DFS and non-DFS channel mix.
+ */
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c)
+ return -EINVAL;
+
+ if (c->flags & IEEE80211_CHAN_DISABLED)
+ return -EINVAL;
+
+ if (c->flags & IEEE80211_CHAN_RADAR) {
+ if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
+ return -EINVAL;
+
+ if (c->dfs_state == NL80211_DFS_USABLE)
+ count++;
+ }
+ }
+
+ return count;
+}
+
+bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef)
+{
+ int width;
+ int r1, r2 = 0;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return false;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return false;
+
+ r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
+ width);
+
+ if (r1 < 0)
+ return false;
+
+ switch (chandef->width) {
+ case NL80211_CHAN_WIDTH_80P80:
+ WARN_ON(!chandef->center_freq2);
+ r2 = cfg80211_get_chans_dfs_usable(wiphy,
+ chandef->center_freq2,
+ width);
+ if (r2 < 0)
+ return false;
+ break;
+ default:
+ WARN_ON(chandef->center_freq2);
+ break;
+ }
+
+ return (r1 + r2 > 0);
+}
+
+/*
+ * Checks if center frequency of chan falls with in the bandwidth
+ * range of chandef.
+ */
+bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
+ struct ieee80211_channel *chan)
+{
+ int width;
+ u32 freq;
+
+ if (chandef->chan->center_freq == chan->center_freq)
+ return true;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width <= 20)
+ return false;
+
+ for (freq = chandef->center_freq1 - width / 2 + 10;
+ freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
+ if (chan->center_freq == freq)
+ return true;
+ }
+
+ if (!chandef->center_freq2)
+ return false;
+
+ for (freq = chandef->center_freq2 - width / 2 + 10;
+ freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
+ if (chan->center_freq == freq)
+ return true;
+ }
+
+ return false;
+}
+
+bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
+{
+ bool active = false;
+
+ ASSERT_WDEV_LOCK(wdev);
+
+ if (!wdev->chandef.chan)
+ return false;
+
+ switch (wdev->iftype) {
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_P2P_GO:
+ active = wdev->beacon_interval != 0;
+ break;
+ case NL80211_IFTYPE_ADHOC:
+ active = wdev->ssid_len != 0;
+ break;
+ case NL80211_IFTYPE_MESH_POINT:
+ active = wdev->mesh_id_len != 0;
+ break;
+ case NL80211_IFTYPE_STATION:
+ case NL80211_IFTYPE_OCB:
+ case NL80211_IFTYPE_P2P_CLIENT:
+ case NL80211_IFTYPE_MONITOR:
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_WDS:
+ case NL80211_IFTYPE_P2P_DEVICE:
+ /* Can NAN type be considered as beaconing interface? */
+ case NL80211_IFTYPE_NAN:
+ break;
+ case NL80211_IFTYPE_UNSPECIFIED:
+ case NUM_NL80211_IFTYPES:
+ WARN_ON(1);
+ }
+
+ return active;
+}
+
+static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
+ struct ieee80211_channel *chan)
+{
+ struct wireless_dev *wdev;
+
+ list_for_each_entry(wdev, &wiphy->wdev_list, list) {
+ wdev_lock(wdev);
+ if (!cfg80211_beaconing_iface_active(wdev)) {
+ wdev_unlock(wdev);
+ continue;
+ }
+
+ if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
+ wdev_unlock(wdev);
+ return true;
+ }
+ wdev_unlock(wdev);
+ }
+
+ return false;
+}
+
+bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
+ struct ieee80211_channel *chan)
+{
+ struct cfg80211_registered_device *rdev;
+
+ ASSERT_RTNL();
+
+ if (!(chan->flags & IEEE80211_CHAN_RADAR))
+ return false;
+
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+ if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
+ continue;
+
+ if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
+ return true;
+ }
+
+ return false;
+}
+
+static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bandwidth)
+{
+ struct ieee80211_channel *c;
+ u32 freq, start_freq, end_freq;
+ bool dfs_offload;
+
+ dfs_offload = wiphy_ext_feature_isset(wiphy,
+ NL80211_EXT_FEATURE_DFS_OFFLOAD);
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
+
+ /*
+ * Check entire range of channels for the bandwidth.
+ * If any channel in between is disabled or has not
+ * had gone through CAC return false
+ */
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c)
+ return false;
+
+ if (c->flags & IEEE80211_CHAN_DISABLED)
+ return false;
+
+ if ((c->flags & IEEE80211_CHAN_RADAR) &&
+ (c->dfs_state != NL80211_DFS_AVAILABLE) &&
+ !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
+ return false;
+ }
+
+ return true;
+}
+
+static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef)
+{
+ int width;
+ int r;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return false;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return false;
+
+ r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
+ width);
+
+ /* If any of channels unavailable for cf1 just return */
+ if (!r)
+ return r;
+
+ switch (chandef->width) {
+ case NL80211_CHAN_WIDTH_80P80:
+ WARN_ON(!chandef->center_freq2);
+ r = cfg80211_get_chans_dfs_available(wiphy,
+ chandef->center_freq2,
+ width);
+ break;
+ default:
+ WARN_ON(chandef->center_freq2);
+ break;
+ }
+
+ return r;
+}
+
+static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bandwidth)
+{
+ struct ieee80211_channel *c;
+ u32 start_freq, end_freq, freq;
+ unsigned int dfs_cac_ms = 0;
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
+
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c)
+ return 0;
+
+ if (c->flags & IEEE80211_CHAN_DISABLED)
+ return 0;
+
+ if (!(c->flags & IEEE80211_CHAN_RADAR))
+ continue;
+
+ if (c->dfs_cac_ms > dfs_cac_ms)
+ dfs_cac_ms = c->dfs_cac_ms;
+ }
+
+ return dfs_cac_ms;
+}
+
+unsigned int
+cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef)
+{
+ int width;
+ unsigned int t1 = 0, t2 = 0;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return 0;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return 0;
+
+ t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
+ chandef->center_freq1,
+ width);
+
+ if (!chandef->center_freq2)
+ return t1;
+
+ t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
+ chandef->center_freq2,
+ width);
+
+ return max(t1, t2);
+}
+
+static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
+ u32 center_freq, u32 bandwidth,
+ u32 prohibited_flags)
+{
+ struct ieee80211_channel *c;
+ u32 freq, start_freq, end_freq;
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
+
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c || c->flags & prohibited_flags)
+ return false;
+ }
+
+ return true;
+}
+
+bool cfg80211_chandef_usable(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef,
+ u32 prohibited_flags)
+{
+ struct ieee80211_sta_ht_cap *ht_cap;
+ struct ieee80211_sta_vht_cap *vht_cap;
+ u32 width, control_freq, cap;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return false;
+
+ ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
+ vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
+
+ control_freq = chandef->chan->center_freq;
+
+ switch (chandef->width) {
+ case NL80211_CHAN_WIDTH_5:
+ width = 5;
+ break;
+ case NL80211_CHAN_WIDTH_10:
+ prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
+ width = 10;
+ break;
+ case NL80211_CHAN_WIDTH_20:
+ if (!ht_cap->ht_supported)
+ return false;
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
+ width = 20;
+ break;
+ case NL80211_CHAN_WIDTH_40:
+ width = 40;
+ if (!ht_cap->ht_supported)
+ return false;
+ if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
+ ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
+ return false;
+ if (chandef->center_freq1 < control_freq &&
+ chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
+ return false;
+ if (chandef->center_freq1 > control_freq &&
+ chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
+ return false;
+ break;
+ case NL80211_CHAN_WIDTH_80P80:
+ cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
+ if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
+ return false;
+ case NL80211_CHAN_WIDTH_80:
+ if (!vht_cap->vht_supported)
+ return false;
+ prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
+ width = 80;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ if (!vht_cap->vht_supported)
+ return false;
+ cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
+ if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
+ cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
+ return false;
+ prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
+ width = 160;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return false;
+ }
+
+ /*
+ * TODO: What if there are only certain 80/160/80+80 MHz channels
+ * allowed by the driver, or only certain combinations?
+ * For 40 MHz the driver can set the NO_HT40 flags, but for
+ * 80/160 MHz and in particular 80+80 MHz this isn't really
+ * feasible and we only have NO_80MHZ/NO_160MHZ so far but
+ * no way to cover 80+80 MHz or more complex restrictions.
+ * Note that such restrictions also need to be advertised to
+ * userspace, for example for P2P channel selection.
+ */
+
+ if (width > 20)
+ prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
+
+ /* 5 and 10 MHz are only defined for the OFDM PHY */
+ if (width < 20)
+ prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
+
+
+ if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
+ width, prohibited_flags))
+ return false;
+
+ if (!chandef->center_freq2)
+ return true;
+ return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
+ width, prohibited_flags);
+}
+EXPORT_SYMBOL(cfg80211_chandef_usable);
+
+/*
+ * Check if the channel can be used under permissive conditions mandated by
+ * some regulatory bodies, i.e., the channel is marked with
+ * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
+ * associated to an AP on the same channel or on the same UNII band
+ * (assuming that the AP is an authorized master).
+ * In addition allow operation on a channel on which indoor operation is
+ * allowed, iff we are currently operating in an indoor environment.
+ */
+static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
+ enum nl80211_iftype iftype,
+ struct ieee80211_channel *chan)
+{
+ struct wireless_dev *wdev;
+ struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+ ASSERT_RTNL();
+
+ if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
+ !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
+ return false;
+
+ /* only valid for GO and TDLS off-channel (station/p2p-CL) */
+ if (iftype != NL80211_IFTYPE_P2P_GO &&
+ iftype != NL80211_IFTYPE_STATION &&
+ iftype != NL80211_IFTYPE_P2P_CLIENT)
+ return false;
+
+ if (regulatory_indoor_allowed() &&
+ (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
+ return true;
+
+ if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
+ return false;
+
+ /*
+ * Generally, it is possible to rely on another device/driver to allow
+ * the IR concurrent relaxation, however, since the device can further
+ * enforce the relaxation (by doing a similar verifications as this),
+ * and thus fail the GO instantiation, consider only the interfaces of
+ * the current registered device.
+ */
+ list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
+ struct ieee80211_channel *other_chan = NULL;
+ int r1, r2;
+
+ wdev_lock(wdev);
+ if (wdev->iftype == NL80211_IFTYPE_STATION &&
+ wdev->current_bss)
+ other_chan = wdev->current_bss->pub.channel;
+
+ /*
+ * If a GO already operates on the same GO_CONCURRENT channel,
+ * this one (maybe the same one) can beacon as well. We allow
+ * the operation even if the station we relied on with
+ * GO_CONCURRENT is disconnected now. But then we must make sure
+ * we're not outdoor on an indoor-only channel.
+ */
+ if (iftype == NL80211_IFTYPE_P2P_GO &&
+ wdev->iftype == NL80211_IFTYPE_P2P_GO &&
+ wdev->beacon_interval &&
+ !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
+ other_chan = wdev->chandef.chan;
+ wdev_unlock(wdev);
+
+ if (!other_chan)
+ continue;
+
+ if (chan == other_chan)
+ return true;
+
+ if (chan->band != NL80211_BAND_5GHZ)
+ continue;
+
+ r1 = cfg80211_get_unii(chan->center_freq);
+ r2 = cfg80211_get_unii(other_chan->center_freq);
+
+ if (r1 != -EINVAL && r1 == r2) {
+ /*
+ * At some locations channels 149-165 are considered a
+ * bundle, but at other locations, e.g., Indonesia,
+ * channels 149-161 are considered a bundle while
+ * channel 165 is left out and considered to be in a
+ * different bundle. Thus, in case that there is a
+ * station interface connected to an AP on channel 165,
+ * it is assumed that channels 149-161 are allowed for
+ * GO operations. However, having a station interface
+ * connected to an AP on channels 149-161, does not
+ * allow GO operation on channel 165.
+ */
+ if (chan->center_freq == 5825 &&
+ other_chan->center_freq != 5825)
+ continue;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
+ struct cfg80211_chan_def *chandef,
+ enum nl80211_iftype iftype,
+ bool check_no_ir)
+{
+ bool res;
+ u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
+ IEEE80211_CHAN_RADAR;
+
+ trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
+
+ if (check_no_ir)
+ prohibited_flags |= IEEE80211_CHAN_NO_IR;
+
+ if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
+ cfg80211_chandef_dfs_available(wiphy, chandef)) {
+ /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
+ prohibited_flags = IEEE80211_CHAN_DISABLED;
+ }
+
+ res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
+
+ trace_cfg80211_return_bool(res);
+ return res;
+}
+
+bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
+ struct cfg80211_chan_def *chandef,
+ enum nl80211_iftype iftype)
+{
+ return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
+}
+EXPORT_SYMBOL(cfg80211_reg_can_beacon);
+
+bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
+ struct cfg80211_chan_def *chandef,
+ enum nl80211_iftype iftype)
+{
+ bool check_no_ir;
+
+ ASSERT_RTNL();
+
+ /*
+ * Under certain conditions suggested by some regulatory bodies a
+ * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
+ * only if such relaxations are not enabled and the conditions are not
+ * met.
+ */
+ check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
+ chandef->chan);
+
+ return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
+}
+EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
+
+int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
+ struct cfg80211_chan_def *chandef)
+{
+ if (!rdev->ops->set_monitor_channel)
+ return -EOPNOTSUPP;
+ if (!cfg80211_has_monitors_only(rdev))
+ return -EBUSY;
+
+ return rdev_set_monitor_channel(rdev, chandef);
+}
+
+void
+cfg80211_get_chan_state(struct wireless_dev *wdev,
+ struct ieee80211_channel **chan,
+ enum cfg80211_chan_mode *chanmode,
+ u8 *radar_detect)
+{
+ int ret;
+
+ *chan = NULL;
+ *chanmode = CHAN_MODE_UNDEFINED;
+
+ ASSERT_WDEV_LOCK(wdev);
+
+ if (wdev->netdev && !netif_running(wdev->netdev))
+ return;
+
+ switch (wdev->iftype) {
+ case NL80211_IFTYPE_ADHOC:
+ if (wdev->current_bss) {
+ *chan = wdev->current_bss->pub.channel;
+ *chanmode = (wdev->ibss_fixed &&
+ !wdev->ibss_dfs_possible)
+ ? CHAN_MODE_SHARED
+ : CHAN_MODE_EXCLUSIVE;
+
+ /* consider worst-case - IBSS can try to return to the
+ * original user-specified channel as creator */
+ if (wdev->ibss_dfs_possible)
+ *radar_detect |= BIT(wdev->chandef.width);
+ return;
+ }
+ break;
+ case NL80211_IFTYPE_STATION:
+ case NL80211_IFTYPE_P2P_CLIENT:
+ if (wdev->current_bss) {
+ *chan = wdev->current_bss->pub.channel;
+ *chanmode = CHAN_MODE_SHARED;
+ return;
+ }
+ break;
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_P2P_GO:
+ if (wdev->cac_started) {
+ *chan = wdev->chandef.chan;
+ *chanmode = CHAN_MODE_SHARED;
+ *radar_detect |= BIT(wdev->chandef.width);
+ } else if (wdev->beacon_interval) {
+ *chan = wdev->chandef.chan;
+ *chanmode = CHAN_MODE_SHARED;
+
+ ret = cfg80211_chandef_dfs_required(wdev->wiphy,
+ &wdev->chandef,
+ wdev->iftype);
+ WARN_ON(ret < 0);
+ if (ret > 0)
+ *radar_detect |= BIT(wdev->chandef.width);
+ }
+ return;
+ case NL80211_IFTYPE_MESH_POINT:
+ if (wdev->mesh_id_len) {
+ *chan = wdev->chandef.chan;
+ *chanmode = CHAN_MODE_SHARED;
+
+ ret = cfg80211_chandef_dfs_required(wdev->wiphy,
+ &wdev->chandef,
+ wdev->iftype);
+ WARN_ON(ret < 0);
+ if (ret > 0)
+ *radar_detect |= BIT(wdev->chandef.width);
+ }
+ return;
+ case NL80211_IFTYPE_OCB:
+ if (wdev->chandef.chan) {
+ *chan = wdev->chandef.chan;
+ *chanmode = CHAN_MODE_SHARED;
+ return;
+ }
+ break;
+ case NL80211_IFTYPE_MONITOR:
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_WDS:
+ case NL80211_IFTYPE_P2P_DEVICE:
+ case NL80211_IFTYPE_NAN:
+ /* these interface types don't really have a channel */
+ return;
+ case NL80211_IFTYPE_UNSPECIFIED:
+ case NUM_NL80211_IFTYPES:
+ WARN_ON(1);
+ }
+}