[PATCH] mac80211: store channel info in sta_bss_list

Some AP equipment "in the wild" uses the same BSSID on multiple channels
(particularly "a" vs. "b/g").  This patch changes the key of sta_bss_list
to include both the BSSID and the channel so as to prevent a BSSID on
one channel from eclipsing the same BSSID on another channel.

Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 19 insertions, 15 deletions

diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 8dae26bbfdf9..c1cc79e9f1f7 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -61,7 +61,7 @@
 static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
                                      u8 *ssid, size_t ssid_len);
 static struct ieee80211_sta_bss *
-ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid);
+ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel);
 static void ieee80211_rx_bss_put(struct net_device *dev,
                                  struct ieee80211_sta_bss *bss);
 static int ieee80211_sta_find_ibss(struct net_device *dev,
@@ -427,7 +427,8 @@ static void ieee80211_set_associated(struct net_device *dev,
                 if (sdata->type != IEEE80211_IF_TYPE_STA)
                         return;
 
-                bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
+                bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
+                                           local->hw.conf.channel);
                 if (bss) {
                         if (bss->has_erp_value)
                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
@@ -574,7 +575,7 @@ static void ieee80211_send_assoc(struct net_device *dev,
                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME |
                         WLAN_CAPABILITY_SHORT_PREAMBLE;
         }
-        bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
+        bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel);
         if (bss) {
                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
                         capab |= WLAN_CAPABILITY_PRIVACY;
@@ -722,6 +723,7 @@ static void ieee80211_send_disassoc(struct net_device *dev,
 static int ieee80211_privacy_mismatch(struct net_device *dev,
                                       struct ieee80211_if_sta *ifsta)
 {
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_sta_bss *bss;
         int res = 0;
 
@@ -729,7 +731,7 @@ static int ieee80211_privacy_mismatch(struct net_device *dev,
             ifsta->key_management_enabled)
                 return 0;
 
-        bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
+        bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel);
         if (!bss)
                 return 0;
 
@@ -1242,7 +1244,8 @@ static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
          * 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);
+                        = ieee80211_rx_bss_get(dev, ifsta->bssid,
+                                               local->hw.conf.channel);
                 if (bss) {
                         bss->erp_value = elems.erp_info[0];
                         bss->has_erp_value = 1;
@@ -1272,7 +1275,8 @@ static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
                                " AP\n", dev->name);
                         return;
                 }
-                bss = ieee80211_rx_bss_get(dev, ifsta->bssid);
+                bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
+                                           local->hw.conf.channel);
                 if (bss) {
                         sta->last_rssi = bss->rssi;
                         sta->last_signal = bss->signal;
@@ -1348,7 +1352,7 @@ static void __ieee80211_rx_bss_hash_del(struct net_device *dev,
 
 
 static struct ieee80211_sta_bss *
-ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
+ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel)
 {
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_sta_bss *bss;
@@ -1359,6 +1363,7 @@ ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
         atomic_inc(&bss->users);
         atomic_inc(&bss->users);
         memcpy(bss->bssid, bssid, ETH_ALEN);
+        bss->channel = channel;
 
         spin_lock_bh(&local->sta_bss_lock);
         /* TODO: order by RSSI? */
@@ -1370,7 +1375,7 @@ ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid)
 
 
 static struct ieee80211_sta_bss *
-ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
+ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel)
 {
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_sta_bss *bss;
@@ -1378,7 +1383,8 @@ ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid)
         spin_lock_bh(&local->sta_bss_lock);
         bss = local->sta_bss_hash[STA_HASH(bssid)];
         while (bss) {
-                if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0) {
+                if (memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
+                    bss->channel == channel) {
                         atomic_inc(&bss->users);
                         break;
                 }
@@ -1546,9 +1552,9 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
         else
                 channel = rx_status->channel;
 
-        bss = ieee80211_rx_bss_get(dev, mgmt->bssid);
+        bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel);
         if (!bss) {
-                bss = ieee80211_rx_bss_add(dev, mgmt->bssid);
+                bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel);
                 if (!bss)
                         return;
         } else {
@@ -1648,7 +1654,6 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
 
 
         bss->hw_mode = rx_status->phymode;
-        bss->channel = channel;
         bss->freq = rx_status->freq;
         if (channel != rx_status->channel &&
             (bss->hw_mode == MODE_IEEE80211G ||
@@ -2399,7 +2404,7 @@ static int ieee80211_sta_create_ibss(struct net_device *dev,
         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n",
                dev->name, print_mac(mac, bssid));
 
-        bss = ieee80211_rx_bss_add(dev, bssid);
+        bss = ieee80211_rx_bss_add(dev, bssid, local->hw.conf.channel);
         if (!bss)
                 return -ENOMEM;
 
@@ -2410,7 +2415,6 @@ static int ieee80211_sta_create_ibss(struct net_device *dev,
                 local->hw.conf.beacon_int = 100;
         bss->beacon_int = local->hw.conf.beacon_int;
         bss->hw_mode = local->hw.conf.phymode;
-        bss->channel = local->hw.conf.channel;
         bss->freq = local->hw.conf.freq;
         bss->last_update = jiffies;
         bss->capability = WLAN_CAPABILITY_IBSS;
@@ -2470,7 +2474,7 @@ static int ieee80211_sta_find_ibss(struct net_device *dev,
                "%s\n", print_mac(mac, bssid), print_mac(mac2, ifsta->bssid));
 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
         if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0 &&
-            (bss = ieee80211_rx_bss_get(dev, bssid))) {
+            (bss = ieee80211_rx_bss_get(dev, bssid, local->hw.conf.channel))) {
                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
                        " based on configured SSID\n",
                        dev->name, print_mac(mac, bssid));