mac80211: MBSSID support in interface handling

Configure multiple BSSID and enhanced multi-BSSID advertisement (EMA)
parameters in mac80211 for AP mode.

For each interface, 'mbssid_tx_vif' points to the transmitting interface of
the MBSSID set. The pointer is set to NULL if MBSSID is disabled.

Function ieee80211_stop() is modified to always bring down all the
non-transmitting interfaces first and the transmitting interface last.

Signed-off-by: John Crispin <john@phrozen.org>
Co-developed-by: Aloka Dixit <alokad@codeaurora.org>
Signed-off-by: Aloka Dixit <alokad@codeaurora.org>
Link: https://lore.kernel.org/r/20210916025437.29138-3-alokad@codeaurora.org
[slightly change logic to be more obvious]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index d69b31c20fe2..e2b791c37591 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -111,6 +111,36 @@ static int ieee80211_set_mon_options(struct ieee80211_sub_if_data *sdata,
 	return 0;
 }
 
+static int ieee80211_set_ap_mbssid_options(struct ieee80211_sub_if_data *sdata,
+					   struct cfg80211_mbssid_config params)
+{
+	struct ieee80211_sub_if_data *tx_sdata;
+
+	sdata->vif.mbssid_tx_vif = NULL;
+	sdata->vif.bss_conf.bssid_index = 0;
+	sdata->vif.bss_conf.nontransmitted = false;
+	sdata->vif.bss_conf.ema_ap = false;
+
+	if (sdata->vif.type != NL80211_IFTYPE_AP || !params.tx_wdev)
+		return -EINVAL;
+
+	tx_sdata = IEEE80211_WDEV_TO_SUB_IF(params.tx_wdev);
+	if (!tx_sdata)
+		return -EINVAL;
+
+	if (tx_sdata == sdata) {
+		sdata->vif.mbssid_tx_vif = &sdata->vif;
+	} else {
+		sdata->vif.mbssid_tx_vif = &tx_sdata->vif;
+		sdata->vif.bss_conf.nontransmitted = true;
+		sdata->vif.bss_conf.bssid_index = params.index;
+	}
+	if (params.ema)
+		sdata->vif.bss_conf.ema_ap = true;
+
+	return 0;
+}
+
 static struct wireless_dev *ieee80211_add_iface(struct wiphy *wiphy,
 						const char *name,
 						unsigned char name_assign_type,
@@ -1105,6 +1135,14 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 			changed |= BSS_CHANGED_HE_BSS_COLOR;
 	}
 
+	if (sdata->vif.type == NL80211_IFTYPE_AP &&
+	    params->mbssid_config.tx_wdev) {
+		err = ieee80211_set_ap_mbssid_options(sdata,
+						      params->mbssid_config);
+		if (err)
+			return err;
+	}
+
 	mutex_lock(&local->mtx);
 	err = ieee80211_vif_use_channel(sdata, &params->chandef,
 					IEEE80211_CHANCTX_SHARED);