[PATCH] mac80211: store SSID in sta_bss_list

Some AP equipment "in the wild" services multiple SSIDs using the
same BSSID.  This patch changes the key of sta_bss_list to include
the SSID as well as the BSSID and the channel so as to prevent one
SSID from eclipsing another SSID with the same BSSID.

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

1 files changed, 33 insertions, 21 deletions

diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index c1cc79e9f1f7..db81aef6177a 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -12,7 +12,6 @@
  */
 
 /* TODO:
- * BSS table: use <BSSID,SSID> as the key to support multi-SSID APs
  * order BSS list by RSSI(?) ("quality of AP")
  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
  *    SSID)
@@ -61,7 +60,8 @@
 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, int channel);
+ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
+                     u8 *ssid, u8 ssid_len);
 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,
@@ -428,7 +428,8 @@ static void ieee80211_set_associated(struct net_device *dev,
                         return;
 
                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
-                                           local->hw.conf.channel);
+                                           local->hw.conf.channel,
+                                           ifsta->ssid, ifsta->ssid_len);
                 if (bss) {
                         if (bss->has_erp_value)
                                 ieee80211_handle_erp_ie(dev, bss->erp_value);
@@ -575,7 +576,8 @@ 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, local->hw.conf.channel);
+        bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
+                                   ifsta->ssid, ifsta->ssid_len);
         if (bss) {
                 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
                         capab |= WLAN_CAPABILITY_PRIVACY;
@@ -731,7 +733,8 @@ static int ieee80211_privacy_mismatch(struct net_device *dev,
             ifsta->key_management_enabled)
                 return 0;
 
-        bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel);
+        bss = ieee80211_rx_bss_get(dev, ifsta->bssid, local->hw.conf.channel,
+                                   ifsta->ssid, ifsta->ssid_len);
         if (!bss)
                 return 0;
 
@@ -1245,7 +1248,8 @@ static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
         if (elems.erp_info && elems.erp_info_len >= 1) {
                 struct ieee80211_sta_bss *bss
                         = ieee80211_rx_bss_get(dev, ifsta->bssid,
-                                               local->hw.conf.channel);
+                                               local->hw.conf.channel,
+                                               ifsta->ssid, ifsta->ssid_len);
                 if (bss) {
                         bss->erp_value = elems.erp_info[0];
                         bss->has_erp_value = 1;
@@ -1276,7 +1280,8 @@ static void ieee80211_rx_mgmt_assoc_resp(struct net_device *dev,
                         return;
                 }
                 bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
-                                           local->hw.conf.channel);
+                                           local->hw.conf.channel,
+                                           ifsta->ssid, ifsta->ssid_len);
                 if (bss) {
                         sta->last_rssi = bss->rssi;
                         sta->last_signal = bss->signal;
@@ -1352,7 +1357,8 @@ 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, int channel)
+ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel,
+                     u8 *ssid, u8 ssid_len)
 {
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_sta_bss *bss;
@@ -1364,6 +1370,10 @@ ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel)
         atomic_inc(&bss->users);
         memcpy(bss->bssid, bssid, ETH_ALEN);
         bss->channel = channel;
+        if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
+                memcpy(bss->ssid, ssid, ssid_len);
+                bss->ssid_len = ssid_len;
+        }
 
         spin_lock_bh(&local->sta_bss_lock);
         /* TODO: order by RSSI? */
@@ -1375,7 +1385,8 @@ ieee80211_rx_bss_add(struct net_device *dev, u8 *bssid, int channel)
 
 
 static struct ieee80211_sta_bss *
-ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel)
+ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel,
+                     u8 *ssid, u8 ssid_len)
 {
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_sta_bss *bss;
@@ -1383,8 +1394,10 @@ ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int channel)
         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 &&
-                    bss->channel == channel) {
+                if (!memcmp(bss->bssid, bssid, ETH_ALEN) &&
+                    bss->channel == channel &&
+                    bss->ssid_len == ssid_len &&
+                    (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
                         atomic_inc(&bss->users);
                         break;
                 }
@@ -1552,9 +1565,11 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
         else
                 channel = rx_status->channel;
 
-        bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel);
+        bss = ieee80211_rx_bss_get(dev, mgmt->bssid, channel,
+                                   elems.ssid, elems.ssid_len);
         if (!bss) {
-                bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel);
+                bss = ieee80211_rx_bss_add(dev, mgmt->bssid, channel,
+                                           elems.ssid, elems.ssid_len);
                 if (!bss)
                         return;
         } else {
@@ -1580,10 +1595,6 @@ static void ieee80211_rx_bss_info(struct net_device *dev,
 
         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) {
-                memcpy(bss->ssid, elems.ssid, elems.ssid_len);
-                bss->ssid_len = elems.ssid_len;
-        }
 
         bss->supp_rates_len = 0;
         if (elems.supp_rates) {
@@ -2381,7 +2392,7 @@ static int ieee80211_sta_create_ibss(struct net_device *dev,
 {
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_sta_bss *bss;
-        struct ieee80211_sub_if_data *sdata;
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
         struct ieee80211_hw_mode *mode;
         u8 bssid[ETH_ALEN], *pos;
         int i;
@@ -2404,11 +2415,11 @@ 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, local->hw.conf.channel);
+        bss = ieee80211_rx_bss_add(dev, bssid, local->hw.conf.channel,
+                                   sdata->u.sta.ssid, sdata->u.sta.ssid_len);
         if (!bss)
                 return -ENOMEM;
 
-        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
         mode = local->oper_hw_mode;
 
         if (local->hw.conf.beacon_int == 0)
@@ -2474,7 +2485,8 @@ 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, local->hw.conf.channel))) {
+            (bss = ieee80211_rx_bss_get(dev, bssid, local->hw.conf.channel,
+                                        ifsta->ssid, ifsta->ssid_len))) {
                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s"
                        " based on configured SSID\n",
                        dev->name, print_mac(mac, bssid));