mac80211: add support for BSS color change

The color change announcement is very similar to how CSA works where
we have an IE that includes a counter. When the counter hits 0, the new
color is applied via an updated beacon.

This patch makes the CSA counter functionality reusable, rather than
implementing it again. This also allows for future reuse incase support
for other counter IEs gets added.

Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: John Crispin <john@phrozen.org>
Link: https://lore.kernel.org/r/057c1e67b82bee561ea44ce6a45a8462d3da6995.1625247619.git.lorenzo@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 223 insertions, 11 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 4e6f11e63df3..d69b31c20fe2 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -828,9 +828,11 @@ static int ieee80211_set_monitor_channel(struct wiphy *wiphy,
 	return ret;
 }
 
-static int ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
-				    const u8 *resp, size_t resp_len,
-				    const struct ieee80211_csa_settings *csa)
+static int
+ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
+			 const u8 *resp, size_t resp_len,
+			 const struct ieee80211_csa_settings *csa,
+			 const struct ieee80211_color_change_settings *cca)
 {
 	struct probe_resp *new, *old;
 
@@ -850,6 +852,8 @@ static int ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
 		memcpy(new->cntdwn_counter_offsets, csa->counter_offsets_presp,
 		       csa->n_counter_offsets_presp *
 		       sizeof(new->cntdwn_counter_offsets[0]));
+	else if (cca)
+		new->cntdwn_counter_offsets[0] = cca->counter_offset_presp;
 
 	rcu_assign_pointer(sdata->u.ap.probe_resp, new);
 	if (old)
@@ -955,7 +959,8 @@ static int ieee80211_set_ftm_responder_params(
 
 static int ieee80211_assign_beacon(struct ieee80211_sub_if_data *sdata,
 				   struct cfg80211_beacon_data *params,
-				   const struct ieee80211_csa_settings *csa)
+				   const struct ieee80211_csa_settings *csa,
+				   const struct ieee80211_color_change_settings *cca)
 {
 	struct beacon_data *new, *old;
 	int new_head_len, new_tail_len;
@@ -1004,6 +1009,9 @@ static int ieee80211_assign_beacon(struct ieee80211_sub_if_data *sdata,
 		memcpy(new->cntdwn_counter_offsets, csa->counter_offsets_beacon,
 		       csa->n_counter_offsets_beacon *
 		       sizeof(new->cntdwn_counter_offsets[0]));
+	} else if (cca) {
+		new->cntdwn_current_counter = cca->count;
+		new->cntdwn_counter_offsets[0] = cca->counter_offset_beacon;
 	}
 
 	/* copy in head */
@@ -1020,7 +1028,7 @@ static int ieee80211_assign_beacon(struct ieee80211_sub_if_data *sdata,
 			memcpy(new->tail, old->tail, new_tail_len);
 
 	err = ieee80211_set_probe_resp(sdata, params->probe_resp,
-				       params->probe_resp_len, csa);
+				       params->probe_resp_len, csa, cca);
 	if (err < 0) {
 		kfree(new);
 		return err;
@@ -1175,7 +1183,7 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 	if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
 		sdata->vif.bss_conf.beacon_tx_rate = params->beacon_rate;
 
-	err = ieee80211_assign_beacon(sdata, &params->beacon, NULL);
+	err = ieee80211_assign_beacon(sdata, &params->beacon, NULL, NULL);
 	if (err < 0)
 		goto error;
 	changed |= err;
@@ -1230,17 +1238,17 @@ static int ieee80211_change_beacon(struct wiphy *wiphy, struct net_device *dev,
 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	sdata_assert_lock(sdata);
 
-	/* don't allow changing the beacon while CSA is in place - offset
+	/* don't allow changing the beacon while a countdown is in place - offset
 	 * of channel switch counter may change
 	 */
-	if (sdata->vif.csa_active)
+	if (sdata->vif.csa_active || sdata->vif.color_change_active)
 		return -EBUSY;
 
 	old = sdata_dereference(sdata->u.ap.beacon, sdata);
 	if (!old)
 		return -ENOENT;
 
-	err = ieee80211_assign_beacon(sdata, params, NULL);
+	err = ieee80211_assign_beacon(sdata, params, NULL, NULL);
 	if (err < 0)
 		return err;
 	ieee80211_bss_info_change_notify(sdata, err);
@@ -3156,7 +3164,7 @@ static int ieee80211_set_after_csa_beacon(struct ieee80211_sub_if_data *sdata,
 	switch (sdata->vif.type) {
 	case NL80211_IFTYPE_AP:
 		err = ieee80211_assign_beacon(sdata, sdata->u.ap.next_beacon,
-					      NULL);
+					      NULL, NULL);
 		kfree(sdata->u.ap.next_beacon);
 		sdata->u.ap.next_beacon = NULL;
 
@@ -3322,7 +3330,7 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata,
 		csa.n_counter_offsets_presp = params->n_counter_offsets_presp;
 		csa.count = params->count;
 
-		err = ieee80211_assign_beacon(sdata, &params->beacon_csa, &csa);
+		err = ieee80211_assign_beacon(sdata, &params->beacon_csa, &csa, NULL);
 		if (err < 0) {
 			kfree(sdata->u.ap.next_beacon);
 			return err;
@@ -3411,6 +3419,15 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata,
 	return 0;
 }
 
+static void ieee80211_color_change_abort(struct ieee80211_sub_if_data  *sdata)
+{
+	sdata->vif.color_change_active = false;
+	kfree(sdata->u.ap.next_beacon);
+	sdata->u.ap.next_beacon = NULL;
+
+	cfg80211_color_change_aborted_notify(sdata->dev);
+}
+
 static int
 __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 			   struct cfg80211_csa_settings *params)
@@ -3479,6 +3496,10 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 		goto out;
 	}
 
+	/* if there is a color change in progress, abort it */
+	if (sdata->vif.color_change_active)
+		ieee80211_color_change_abort(sdata);
+
 	err = ieee80211_set_csa_beacon(sdata, params, &changed);
 	if (err) {
 		ieee80211_vif_unreserve_chanctx(sdata);
@@ -4130,6 +4151,196 @@ static int ieee80211_set_sar_specs(struct wiphy *wiphy,
 	return local->ops->set_sar_specs(&local->hw, sar);
 }
 
+static int
+ieee80211_set_after_color_change_beacon(struct ieee80211_sub_if_data *sdata,
+					u32 *changed)
+{
+	switch (sdata->vif.type) {
+	case NL80211_IFTYPE_AP: {
+		int ret;
+
+		ret = ieee80211_assign_beacon(sdata, sdata->u.ap.next_beacon,
+					      NULL, NULL);
+		kfree(sdata->u.ap.next_beacon);
+		sdata->u.ap.next_beacon = NULL;
+
+		if (ret < 0)
+			return ret;
+
+		*changed |= ret;
+		break;
+	}
+	default:
+		WARN_ON_ONCE(1);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+ieee80211_set_color_change_beacon(struct ieee80211_sub_if_data *sdata,
+				  struct cfg80211_color_change_settings *params,
+				  u32 *changed)
+{
+	struct ieee80211_color_change_settings color_change = {};
+	int err;
+
+	switch (sdata->vif.type) {
+	case NL80211_IFTYPE_AP:
+		sdata->u.ap.next_beacon =
+			cfg80211_beacon_dup(&params->beacon_next);
+		if (!sdata->u.ap.next_beacon)
+			return -ENOMEM;
+
+		if (params->count <= 1)
+			break;
+
+		color_change.counter_offset_beacon =
+			params->counter_offset_beacon;
+		color_change.counter_offset_presp =
+			params->counter_offset_presp;
+		color_change.count = params->count;
+
+		err = ieee80211_assign_beacon(sdata, &params->beacon_color_change,
+					      NULL, &color_change);
+		if (err < 0) {
+			kfree(sdata->u.ap.next_beacon);
+			return err;
+		}
+		*changed |= err;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static void
+ieee80211_color_change_bss_config_notify(struct ieee80211_sub_if_data *sdata,
+					 u8 color, int enable, u32 changed)
+{
+	sdata->vif.bss_conf.he_bss_color.color = color;
+	sdata->vif.bss_conf.he_bss_color.enabled = enable;
+	changed |= BSS_CHANGED_HE_BSS_COLOR;
+
+	ieee80211_bss_info_change_notify(sdata, changed);
+}
+
+static int ieee80211_color_change_finalize(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_local *local = sdata->local;
+	u32 changed = 0;
+	int err;
+
+	sdata_assert_lock(sdata);
+	lockdep_assert_held(&local->mtx);
+
+	sdata->vif.color_change_active = false;
+
+	err = ieee80211_set_after_color_change_beacon(sdata, &changed);
+	if (err) {
+		cfg80211_color_change_aborted_notify(sdata->dev);
+		return err;
+	}
+
+	ieee80211_color_change_bss_config_notify(sdata,
+						 sdata->vif.color_change_color,
+						 1, changed);
+	cfg80211_color_change_notify(sdata->dev);
+
+	return 0;
+}
+
+void ieee80211_color_change_finalize_work(struct work_struct *work)
+{
+	struct ieee80211_sub_if_data *sdata =
+		container_of(work, struct ieee80211_sub_if_data,
+			     color_change_finalize_work);
+	struct ieee80211_local *local = sdata->local;
+
+	sdata_lock(sdata);
+	mutex_lock(&local->mtx);
+
+	/* AP might have been stopped while waiting for the lock. */
+	if (!sdata->vif.color_change_active)
+		goto unlock;
+
+	if (!ieee80211_sdata_running(sdata))
+		goto unlock;
+
+	ieee80211_color_change_finalize(sdata);
+
+unlock:
+	mutex_unlock(&local->mtx);
+	sdata_unlock(sdata);
+}
+
+void ieee80211_color_change_finish(struct ieee80211_vif *vif)
+{
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+
+	ieee80211_queue_work(&sdata->local->hw,
+			     &sdata->color_change_finalize_work);
+}
+EXPORT_SYMBOL_GPL(ieee80211_color_change_finish);
+
+void
+ieeee80211_obss_color_collision_notify(struct ieee80211_vif *vif,
+				       u64 color_bitmap)
+{
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+
+	if (sdata->vif.color_change_active || sdata->vif.csa_active)
+		return;
+
+	cfg80211_obss_color_collision_notify(sdata->dev, color_bitmap);
+}
+EXPORT_SYMBOL_GPL(ieeee80211_obss_color_collision_notify);
+
+static int
+ieee80211_color_change(struct wiphy *wiphy, struct net_device *dev,
+		       struct cfg80211_color_change_settings *params)
+{
+	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	struct ieee80211_local *local = sdata->local;
+	u32 changed = 0;
+	int err;
+
+	sdata_assert_lock(sdata);
+
+	mutex_lock(&local->mtx);
+
+	/* don't allow another color change if one is already active or if csa
+	 * is active
+	 */
+	if (sdata->vif.color_change_active || sdata->vif.csa_active) {
+		err = -EBUSY;
+		goto out;
+	}
+
+	err = ieee80211_set_color_change_beacon(sdata, params, &changed);
+	if (err)
+		goto out;
+
+	sdata->vif.color_change_active = true;
+	sdata->vif.color_change_color = params->color;
+
+	cfg80211_color_change_started_notify(sdata->dev, params->count);
+
+	if (changed)
+		ieee80211_color_change_bss_config_notify(sdata, 0, 0, changed);
+	else
+		/* if the beacon didn't change, we can finalize immediately */
+		ieee80211_color_change_finalize(sdata);
+
+out:
+	mutex_unlock(&local->mtx);
+
+	return err;
+}
+
 const struct cfg80211_ops mac80211_config_ops = {
 	.add_virtual_intf = ieee80211_add_iface,
 	.del_virtual_intf = ieee80211_del_iface,
@@ -4233,4 +4444,5 @@ const struct cfg80211_ops mac80211_config_ops = {
 	.set_tid_config = ieee80211_set_tid_config,
 	.reset_tid_config = ieee80211_reset_tid_config,
 	.set_sar_specs = ieee80211_set_sar_specs,
+	.color_change = ieee80211_color_change,
 };