3 files changed, 67 insertions, 19 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index ecd61e8438a5..272f8c8c90da 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -227,6 +227,17 @@ struct ieee80211_cts {
 #define WLAN_CAPABILITY_SHORT_SLOT_TIME (1<<10)
 #define WLAN_CAPABILITY_DSSS_OFDM       (1<<13)
 
+/* 802.11g ERP information element */
+#define WLAN_ERP_NON_ERP_PRESENT (1<<0)
+#define WLAN_ERP_USE_PROTECTION (1<<1)
+#define WLAN_ERP_BARKER_PREAMBLE (1<<2)
+
+/* WLAN_ERP_BARKER_PREAMBLE values */
+enum {
+        WLAN_ERP_PREAMBLE_SHORT = 0,
+        WLAN_ERP_PREAMBLE_LONG = 1,
+};
+
 /* Status codes */
 enum ieee80211_statuscode {
         WLAN_STATUS_SUCCESS = 0,
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index b222a9afd4e9..99ff7c5e9204 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -99,6 +99,12 @@ struct ieee80211_sta_bss {
         int probe_resp;
         unsigned long last_update;
 
+        /* during assocation, we save an ERP value from a probe response so
+         * that we can feed ERP info to the driver when handling the
+         * association completes. these fields probably won't be up-to-date
+         * otherwise, you probably don't want to use them. */
+        int has_erp_value;
+        u8 erp_value;
 };
 
 
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index f3ca83743b48..df6c410de161 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -314,6 +314,27 @@ static void ieee80211_sta_wmm_params(struct net_device *dev,
 }
 
 
+static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+        int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
+
+        if (use_protection != !!ifsta->use_protection) {
+                if (net_ratelimit()) {
+                        printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
+                               MAC_FMT ")\n",
+                               dev->name,
+                               use_protection ? "enabled" : "disabled",
+                               MAC_ARG(ifsta->bssid));
+                }
+                ifsta->use_protection = use_protection ? 1 : 0;
+                local->cts_protect_erp_frames = use_protection;
+        }
+}
+
+
 static void ieee80211_sta_send_associnfo(struct net_device *dev,
                                          struct ieee80211_if_sta *ifsta)
 {
@@ -377,9 +398,18 @@ static void ieee80211_set_associated(struct net_device *dev,
 
         if (assoc) {
                 struct ieee80211_sub_if_data *sdata;
+                struct ieee80211_sta_bss *bss;
                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
                 if (sdata->type != IEEE80211_IF_TYPE_STA)
                         return;
+
+                bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
+                if (bss) {
+                        if (bss->has_erp_value)
+                                ieee80211_handle_erp_ie(dev, bss->erp_value);
+                        ieee80211_rx_bss_put(dev, bss);
+                }
+
                 netif_carrier_on(dev);
                 ifsta->prev_bssid_set = 1;
                 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
@@ -1177,6 +1207,18 @@ static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
                 return;
         }
 
+        /* it probably doesn't, but if the frame includes an ERP value then
+         * update our stored copy */
+        if (elems.erp_info && elems.erp_info_len >= 1) {
+                struct ieee80211_sta_bss *bss
+                        = ieee80211_rx_bss_get(dev, ifsta->bssid);
+                if (bss) {
+                        bss->erp_value = elems.erp_info[0];
+                        bss->has_erp_value = 1;
+                        ieee80211_rx_bss_put(dev, bss);
+                }
+        }
+
         printk(KERN_DEBUG "%s: associated\n", dev->name);
         ifsta->aid = aid;
         ifsta->ap_capab = capab_info;
@@ -1499,6 +1541,12 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
                 return;
         }
 
+        /* save the ERP value so that it is available at association time */
+        if (elems.erp_info && elems.erp_info_len >= 1) {
+                bss->erp_value = elems.erp_info[0];
+                bss->has_erp_value = 1;
+        }
+
         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
         if (elems.ssid && elems.ssid_len <= IEEE80211_MAX_SSID_LEN) {
@@ -1614,10 +1662,8 @@ static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
                                      size_t len,
                                      struct ieee80211_rx_status *rx_status)
 {
-        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_sub_if_data *sdata;
         struct ieee80211_if_sta *ifsta;
-        int use_protection;
         size_t baselen;
         struct ieee802_11_elems elems;
 
@@ -1641,23 +1687,8 @@ static void ieee80211_rx_mgmt_beacon(struct net_device *dev,
                                    &elems) == ParseFailed)
                 return;
 
-        use_protection = 0;
-        if (elems.erp_info && elems.erp_info_len >= 1) {
-                use_protection =
-                        (elems.erp_info[0] & ERP_INFO_USE_PROTECTION) != 0;
-        }
-
-        if (use_protection != !!ifsta->use_protection) {
-                if (net_ratelimit()) {
-                        printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
-                               MAC_FMT ")\n",
-                               dev->name,
-                               use_protection ? "enabled" : "disabled",
-                               MAC_ARG(ifsta->bssid));
-                }
-                ifsta->use_protection = use_protection ? 1 : 0;
-                local->cts_protect_erp_frames = use_protection;
-        }
+        if (elems.erp_info && elems.erp_info_len >= 1)
+                ieee80211_handle_erp_ie(dev, elems.erp_info[0]);
 
         if (elems.wmm_param && ifsta->wmm_enabled) {
                 ieee80211_sta_wmm_params(dev, ifsta, elems.wmm_param,