cfg80211/mac80211: allow per-station GTKs

[pandora-kernel.git] / net / mac80211 / key.c

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 6a63d1a..ccd676b 100644 (file)
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -68,15 +68,21 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 
        might_sleep();
 
-       if (!key->local->ops->set_key) {
-               ret = -EOPNOTSUPP;
+       if (!key->local->ops->set_key)
                goto out_unsupported;
-       }
 
        assert_key_lock(key->local);
 
        sta = get_sta_for_key(key);
 
+       /*
+        * If this is a per-STA GTK, check if it
+        * is supported; if not, return.
+        */
+       if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
+           !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
+               goto out_unsupported;
+
        sdata = key->sdata;
        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
                sdata = container_of(sdata->bss,
@@ -85,31 +91,28 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 
        ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf);
 
-       if (!ret)
+       if (!ret) {
                key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
+               return 0;
+       }
 
-       if (ret && ret != -ENOSPC && ret != -EOPNOTSUPP)
+       if (ret != -ENOSPC && ret != -EOPNOTSUPP)
                wiphy_err(key->local->hw.wiphy,
                          "failed to set key (%d, %pM) to hardware (%d)\n",
                          key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
 
-out_unsupported:
-       if (ret) {
-               switch (key->conf.cipher) {
-               case WLAN_CIPHER_SUITE_WEP40:
-               case WLAN_CIPHER_SUITE_WEP104:
-               case WLAN_CIPHER_SUITE_TKIP:
-               case WLAN_CIPHER_SUITE_CCMP:
-               case WLAN_CIPHER_SUITE_AES_CMAC:
-                       /* all of these we can do in software */
-                       ret = 0;
-                       break;
-               default:
-                       ret = -EINVAL;
-               }
+ out_unsupported:
+       switch (key->conf.cipher) {
+       case WLAN_CIPHER_SUITE_WEP40:
+       case WLAN_CIPHER_SUITE_WEP104:
+       case WLAN_CIPHER_SUITE_TKIP:
+       case WLAN_CIPHER_SUITE_CCMP:
+       case WLAN_CIPHER_SUITE_AES_CMAC:
+               /* all of these we can do in software */
+               return 0;
+       default:
+               return -EINVAL;
        }
-
-       return ret;
 }
 
 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
@@ -147,6 +150,26 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
        key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
 }
 
+void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
+{
+       struct ieee80211_key *key;
+
+       key = container_of(key_conf, struct ieee80211_key, conf);
+
+       might_sleep();
+       assert_key_lock(key->local);
+
+       key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+
+       /*
+        * Flush TX path to avoid attempts to use this key
+        * after this function returns. Until then, drivers
+        * must be prepared to handle the key.
+        */
+       synchronize_rcu();
+}
+EXPORT_SYMBOL_GPL(ieee80211_key_removed);
+
 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
                                        int idx)
 {
@@ -202,6 +225,7 @@ void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 
 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
                                    struct sta_info *sta,
+                                   bool pairwise,
                                    struct ieee80211_key *old,
                                    struct ieee80211_key *new)
 {
@@ -210,8 +234,14 @@ static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
        if (new)
                list_add(&new->list, &sdata->key_list);
 
-       if (sta) {
-               rcu_assign_pointer(sta->key, new);
+       if (sta && pairwise) {
+               rcu_assign_pointer(sta->ptk, new);
+       } else if (sta) {
+               if (old)
+                       idx = old->conf.keyidx;
+               else
+                       idx = new->conf.keyidx;
+               rcu_assign_pointer(sta->gtk[idx], new);
        } else {
                WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 
@@ -355,6 +385,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
 {
        struct ieee80211_key *old_key;
        int idx, ret;
+       bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 
        BUG_ON(!sdata);
        BUG_ON(!key);
@@ -371,13 +402,6 @@ int ieee80211_key_link(struct ieee80211_key *key,
                 */
                if (test_sta_flags(sta, WLAN_STA_WME))
                        key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
-
-               /*
-                * This key is for a specific sta interface,
-                * inform the driver that it should try to store
-                * this key as pairwise key.
-                */
-               key->conf.flags |= IEEE80211_KEY_FLAG_PAIRWISE;
        } else {
                if (sdata->vif.type == NL80211_IFTYPE_STATION) {
                        struct sta_info *ap;
@@ -399,12 +423,14 @@ int ieee80211_key_link(struct ieee80211_key *key,
 
        mutex_lock(&sdata->local->key_mtx);
 
-       if (sta)
-               old_key = sta->key;
+       if (sta && pairwise)
+               old_key = sta->ptk;
+       else if (sta)
+               old_key = sta->gtk[idx];
        else
                old_key = sdata->keys[idx];
 
-       __ieee80211_key_replace(sdata, sta, old_key, key);
+       __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
        __ieee80211_key_destroy(old_key);
 
        ieee80211_debugfs_key_add(key);
@@ -423,7 +449,8 @@ static void __ieee80211_key_free(struct ieee80211_key *key)
         */
        if (key->sdata)
                __ieee80211_key_replace(key->sdata, key->sta,
-                                       key, NULL);
+                               key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+                               key, NULL);
        __ieee80211_key_destroy(key);
 }