mac80211: notify non-transmitting BSS of color changes

When color change is triggered in multiple bssid case, allow
only for transmitting BSS, and when it changes its bss color,
notify the non transmitting BSSs also of the new bss color.
Signed-off-by: John Crispin <john@phrozen.org>
Co-developed-by: Lavanya Suresh <lavaks@codeaurora.org>
Signed-off-by: Lavanya Suresh <lavaks@codeaurora.org>
Co-developed-by: Rameshkumar Sundaram <quic_ramess@quicinc.com>
Signed-off-by: Rameshkumar Sundaram <quic_ramess@quicinc.com>
Link: https://lore.kernel.org/r/1637146647-16282-1-git-send-email-quic_ramess@quicinc.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/cfg.c

@@ -4268,6 +4268,21 @@ ieee80211_color_change_bss_config_notify(struct ieee80211_sub_if_data *sdata,
 	changed |= BSS_CHANGED_HE_BSS_COLOR;
 
 	ieee80211_bss_info_change_notify(sdata, changed);
+
+	if (!sdata->vif.bss_conf.nontransmitted && sdata->vif.mbssid_tx_vif) {
+		struct ieee80211_sub_if_data *child;
+
+		mutex_lock(&sdata->local->iflist_mtx);
+		list_for_each_entry(child, &sdata->local->interfaces, list) {
+			if (child != sdata && child->vif.mbssid_tx_vif == &sdata->vif) {
+				child->vif.bss_conf.he_bss_color.color = color;
+				child->vif.bss_conf.he_bss_color.enabled = enable;
+				ieee80211_bss_info_change_notify(child,
+								 BSS_CHANGED_HE_BSS_COLOR);
+			}
+		}
+		mutex_unlock(&sdata->local->iflist_mtx);
+	}
 }
 
 static int ieee80211_color_change_finalize(struct ieee80211_sub_if_data *sdata)
@@ -4352,6 +4367,9 @@ ieee80211_color_change(struct wiphy *wiphy, struct net_device *dev,
 
 	sdata_assert_lock(sdata);
 
+	if (sdata->vif.bss_conf.nontransmitted)
+		return -EINVAL;
+
 	mutex_lock(&local->mtx);
 
 	/* don't allow another color change if one is already active or if csa