1 files changed, 120 insertions, 0 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index e59b192459e8..a38f315819cd 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2067,6 +2067,88 @@ reg_process_hint_country_ie(struct wiphy *wiphy,
 	return REG_REQ_IGNORE;
 }
 
+bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
+{
+	const struct ieee80211_regdomain *wiphy1_regd = NULL;
+	const struct ieee80211_regdomain *wiphy2_regd = NULL;
+	const struct ieee80211_regdomain *cfg80211_regd = NULL;
+	bool dfs_domain_same;
+
+	rcu_read_lock();
+
+	cfg80211_regd = rcu_dereference(cfg80211_regdomain);
+	wiphy1_regd = rcu_dereference(wiphy1->regd);
+	if (!wiphy1_regd)
+		wiphy1_regd = cfg80211_regd;
+
+	wiphy2_regd = rcu_dereference(wiphy2->regd);
+	if (!wiphy2_regd)
+		wiphy2_regd = cfg80211_regd;
+
+	dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;
+
+	rcu_read_unlock();
+
+	return dfs_domain_same;
+}
+
+static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
+				    struct ieee80211_channel *src_chan)
+{
+	if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
+	    !(src_chan->flags & IEEE80211_CHAN_RADAR))
+		return;
+
+	if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
+	    src_chan->flags & IEEE80211_CHAN_DISABLED)
+		return;
+
+	if (src_chan->center_freq == dst_chan->center_freq &&
+	    dst_chan->dfs_state == NL80211_DFS_USABLE) {
+		dst_chan->dfs_state = src_chan->dfs_state;
+		dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
+	}
+}
+
+static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
+				       struct wiphy *src_wiphy)
+{
+	struct ieee80211_supported_band *src_sband, *dst_sband;
+	struct ieee80211_channel *src_chan, *dst_chan;
+	int i, j, band;
+
+	if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
+		return;
+
+	for (band = 0; band < NUM_NL80211_BANDS; band++) {
+		dst_sband = dst_wiphy->bands[band];
+		src_sband = src_wiphy->bands[band];
+		if (!dst_sband || !src_sband)
+			continue;
+
+		for (i = 0; i < dst_sband->n_channels; i++) {
+			dst_chan = &dst_sband->channels[i];
+			for (j = 0; j < src_sband->n_channels; j++) {
+				src_chan = &src_sband->channels[j];
+				reg_copy_dfs_chan_state(dst_chan, src_chan);
+			}
+		}
+	}
+}
+
+static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
+{
+	struct cfg80211_registered_device *rdev;
+
+	ASSERT_RTNL();
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		if (wiphy == &rdev->wiphy)
+			continue;
+		wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
+	}
+}
+
 /* This processes *all* regulatory hints */
 static void reg_process_hint(struct regulatory_request *reg_request)
 {
@@ -2110,6 +2192,7 @@ static void reg_process_hint(struct regulatory_request *reg_request)
 	if (treatment == REG_REQ_ALREADY_SET && wiphy &&
 	    wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
 		wiphy_update_regulatory(wiphy, reg_request->initiator);
+		wiphy_all_share_dfs_chan_state(wiphy);
 		reg_check_channels();
 	}
 
@@ -3061,6 +3144,7 @@ void wiphy_regulatory_register(struct wiphy *wiphy)
 
 	lr = get_last_request();
 	wiphy_update_regulatory(wiphy, lr->initiator);
+	wiphy_all_share_dfs_chan_state(wiphy);
 }
 
 void wiphy_regulatory_deregister(struct wiphy *wiphy)
@@ -3148,6 +3232,42 @@ bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
 	return pre_cac_allowed;
 }
 
+void regulatory_propagate_dfs_state(struct wiphy *wiphy,
+				    struct cfg80211_chan_def *chandef,
+				    enum nl80211_dfs_state dfs_state,
+				    enum nl80211_radar_event event)
+{
+	struct cfg80211_registered_device *rdev;
+
+	ASSERT_RTNL();
+
+	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+		return;
+
+	if (WARN_ON(!(chandef->chan->flags & IEEE80211_CHAN_RADAR)))
+		return;
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		if (wiphy == &rdev->wiphy)
+			continue;
+
+		if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
+			continue;
+
+		if (!ieee80211_get_channel(&rdev->wiphy,
+					   chandef->chan->center_freq))
+			continue;
+
+		cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);
+
+		if (event == NL80211_RADAR_DETECTED ||
+		    event == NL80211_RADAR_CAC_FINISHED)
+			cfg80211_sched_dfs_chan_update(rdev);
+
+		nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
+	}
+}
+
 int __init regulatory_init(void)
 {
 	int err = 0;