mac80211: provide SSID in IBSS mode

Some drivers need SSID in AP and IBSS mode. AP SSID is provided
through BSS_CHANGED_SSID notification. There was no easy way to
do the same for IBSS. In IBSS mode SSID is known but was not
stored in BSS configuration. Extend the AP-mode functionality
to also work in IBSS mode.
Signed-off-by: Marek Puzyniak <marek.puzyniak@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/mac80211.h

@@ -209,7 +209,7 @@ struct ieee80211_chanctx_conf {
  * @BSS_CHANGED_QOS: QoS for this association was enabled/disabled. Note
  *	that it is only ever disabled for station mode.
  * @BSS_CHANGED_IDLE: Idle changed for this BSS/interface.
- * @BSS_CHANGED_SSID: SSID changed for this BSS (AP mode)
+ * @BSS_CHANGED_SSID: SSID changed for this BSS (AP and IBSS mode)
  * @BSS_CHANGED_AP_PROBE_RESP: Probe Response changed for this BSS (AP mode)
  * @BSS_CHANGED_PS: PS changed for this BSS (STA mode)
  * @BSS_CHANGED_TXPOWER: TX power setting changed for this interface
@@ -326,7 +326,7 @@ enum ieee80211_rssi_event {
  *	your driver/device needs to do.
  * @ps: power-save mode (STA only). This flag is NOT affected by
  *	offchannel/dynamic_ps operations.
- * @ssid: The SSID of the current vif. Only valid in AP-mode.
+ * @ssid: The SSID of the current vif. Valid in AP and IBSS mode.
  * @ssid_len: Length of SSID given in @ssid.
  * @hidden_ssid: The SSID of the current vif is hidden. Only valid in AP-mode.
  * @txpower: TX power in dBm

net/mac80211/ibss.c

@@ -209,6 +209,8 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	sdata->vif.bss_conf.enable_beacon = true;
 	sdata->vif.bss_conf.beacon_int = beacon_int;
 	sdata->vif.bss_conf.basic_rates = basic_rates;
+	sdata->vif.bss_conf.ssid_len = ifibss->ssid_len;
+	memcpy(sdata->vif.bss_conf.ssid, ifibss->ssid, ifibss->ssid_len);
 	bss_change = BSS_CHANGED_BEACON_INT;
 	bss_change |= ieee80211_reset_erp_info(sdata);
 	bss_change |= BSS_CHANGED_BSSID;
@@ -217,6 +219,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	bss_change |= BSS_CHANGED_BASIC_RATES;
 	bss_change |= BSS_CHANGED_HT;
 	bss_change |= BSS_CHANGED_IBSS;
+	bss_change |= BSS_CHANGED_SSID;
 
 	/*
 	 * In 5 GHz/802.11a, we can always use short slot time.
@@ -1159,6 +1162,7 @@ int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
 	sdata->vif.bss_conf.ibss_joined = false;
 	sdata->vif.bss_conf.ibss_creator = false;
 	sdata->vif.bss_conf.enable_beacon = false;
+	sdata->vif.bss_conf.ssid_len = 0;
 	clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED |
 						BSS_CHANGED_IBSS);