mac80211: Add 802.11h CSA support

Move to the advertised channel on reception of
a CSA element. This is needed for 802.11h compliance.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 7175ae80c36a..ddb966f58882 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1552,7 +1552,9 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
 {
         struct ieee80211_local *local = rx->local;
         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
+        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
+        struct ieee80211_bss *bss;
         int len = rx->skb->len;
 
         if (!ieee80211_is_action(mgmt->frame_control))
@@ -1601,6 +1603,24 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
                                 return RX_DROP_MONITOR;
                         ieee80211_process_measurement_req(sdata, mgmt, len);
                         break;
+                case WLAN_ACTION_SPCT_CHL_SWITCH:
+                        if (len < (IEEE80211_MIN_ACTION_SIZE +
+                                   sizeof(mgmt->u.action.u.chan_switch)))
+                                return RX_DROP_MONITOR;
+
+                        if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0)
+                                return RX_DROP_MONITOR;
+
+                        bss = ieee80211_rx_bss_get(local, ifsta->bssid,
+                                           local->hw.conf.channel->center_freq,
+                                           ifsta->ssid, ifsta->ssid_len);
+                        if (!bss)
+                                return RX_DROP_MONITOR;
+
+                        ieee80211_process_chanswitch(sdata,
+                                     &mgmt->u.action.u.chan_switch.sw_elem, bss);
+                        ieee80211_rx_bss_put(local, bss);
+                        break;
                 }
                 break;
         default: