nl80211: Report new station / assoc event for the correct BSS

drv->ctx always points to the first BSS and we should report event using
BSS related to the interface we got NL80211_CMD_NEW_STATION from.
This fixes STA association for drivers using NL80211_CMD_NEW_STATION and
multiple virtual interfaces.

Before:
nl80211: Drv Event 19 (NL80211_CMD_NEW_STATION) received for wlan0-1 (ifindex:7)
nl80211: New station 02:00:00:00:01:00
wlan0: STA 02:00:00:00:01:00 IEEE 802.11: associated

After:
nl80211: Drv Event 19 (NL80211_CMD_NEW_STATION) received for wlan0-1 (ifindex:7)
nl80211: New station 02:00:00:00:01:00
wlan0-1: STA 02:00:00:00:01:00 IEEE 802.11: associated

This is not applicable to the cases where authentication (AP SME & MLME)
is in hostapd and hostapd_assoc_cb() instead of hostapd_notif_assoc()
handles BSS selection.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

src/drivers/driver_nl80211_event.c

@@ -1123,6 +1123,7 @@ static void nl80211_new_peer_candidate(struct wpa_driver_nl80211_data *drv,
 
 
 static void nl80211_new_station_event(struct wpa_driver_nl80211_data *drv,
+				      struct i802_bss *bss,
 				      struct nlattr **tb)
 {
 	u8 *addr;
@@ -1141,7 +1142,7 @@ static void nl80211_new_station_event(struct wpa_driver_nl80211_data *drv,
 			ies_len = nla_len(tb[NL80211_ATTR_IE]);
 		}
 		wpa_hexdump(MSG_DEBUG, "nl80211: Assoc Req IEs", ies, ies_len);
-		drv_event_assoc(drv->ctx, addr, ies, ies_len, 0);
+		drv_event_assoc(bss->ctx, addr, ies, ies_len, 0);
 		return;
 	}
 
@@ -1150,7 +1151,7 @@ static void nl80211_new_station_event(struct wpa_driver_nl80211_data *drv,
 
 	os_memset(&data, 0, sizeof(data));
 	os_memcpy(data.ibss_rsn_start.peer, addr, ETH_ALEN);
-	wpa_supplicant_event(drv->ctx, EVENT_IBSS_RSN_START, &data);
+	wpa_supplicant_event(bss->ctx, EVENT_IBSS_RSN_START, &data);
 }
 
 
@@ -1824,7 +1825,7 @@ static void do_process_drv_event(struct i802_bss *bss, int cmd,
 				     &data);
 		break;
 	case NL80211_CMD_NEW_STATION:
-		nl80211_new_station_event(drv, tb);
+		nl80211_new_station_event(drv, bss, tb);
 		break;
 	case NL80211_CMD_DEL_STATION:
 		nl80211_del_station_event(drv, tb);