1 files changed, 162 insertions, 104 deletions

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 1b9d87ed143a..8c02469b7176 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -30,26 +30,27 @@
  * keys and per-station keys. Since each station belongs to an interface,
  * each station key also belongs to that interface.
  *
- * Hardware acceleration is done on a best-effort basis, for each key
- * that is eligible the hardware is asked to enable that key but if
- * it cannot do that they key is simply kept for software encryption.
- * There is currently no way of knowing this except by looking into
- * debugfs.
+ * Hardware acceleration is done on a best-effort basis for algorithms
+ * that are implemented in software,  for each key the hardware is asked
+ * to enable that key for offloading but if it cannot do that the key is
+ * simply kept for software encryption (unless it is for an algorithm
+ * that isn't implemented in software).
+ * There is currently no way of knowing whether a key is handled in SW
+ * or HW except by looking into debugfs.
  *
- * All key operations are protected internally.
- *
- * Within mac80211, key references are, just as STA structure references,
- * protected by RCU. Note, however, that some things are unprotected,
- * namely the key->sta dereferences within the hardware acceleration
- * functions. This means that sta_info_destroy() must remove the key
- * which waits for an RCU grace period.
+ * All key management is internally protected by a mutex. Within all
+ * other parts of mac80211, key references are, just as STA structure
+ * references, protected by RCU. Note, however, that some things are
+ * unprotected, namely the key->sta dereferences within the hardware
+ * acceleration functions. This means that sta_info_destroy() must
+ * remove the key which waits for an RCU grace period.
  */
 
 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 
 static void assert_key_lock(struct ieee80211_local *local)
 {
-	WARN_ON(!mutex_is_locked(&local->key_mtx));
+	lockdep_assert_held(&local->key_mtx);
 }
 
 static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key)
@@ -60,7 +61,7 @@ static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key)
 	return NULL;
 }
 
-static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
+static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 {
 	struct ieee80211_sub_if_data *sdata;
 	struct ieee80211_sta *sta;
@@ -69,28 +70,57 @@ static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 	might_sleep();
 
 	if (!key->local->ops->set_key)
-		return;
+		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)
+	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
+		/*
+		 * The driver doesn't know anything about VLAN interfaces.
+		 * Hence, don't send GTKs for VLAN interfaces to the driver.
+		 */
+		if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
+			goto out_unsupported;
 		sdata = container_of(sdata->bss,
 				     struct ieee80211_sub_if_data,
 				     u.ap);
+	}
 
 	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)
-		printk(KERN_ERR "mac80211-%s: failed to set key "
-		       "(%d, %pM) to hardware (%d)\n",
-		       wiphy_name(key->local->hw.wiphy),
-		       key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
+	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:
+	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;
+	}
 }
 
 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
@@ -121,16 +151,35 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 			  sta, &key->conf);
 
 	if (ret)
-		printk(KERN_ERR "mac80211-%s: failed to remove key "
-		       "(%d, %pM) from hardware (%d)\n",
-		       wiphy_name(key->local->hw.wiphy),
-		       key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
+		wiphy_err(key->local->hw.wiphy,
+			  "failed to remove key (%d, %pM) from hardware (%d)\n",
+			  key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
 
 	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)
+					int idx, bool uni, bool multi)
 {
 	struct ieee80211_key *key = NULL;
 
@@ -139,18 +188,19 @@ static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 	if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
 		key = sdata->keys[idx];
 
-	rcu_assign_pointer(sdata->default_key, key);
+	if (uni)
+		rcu_assign_pointer(sdata->default_unicast_key, key);
+	if (multi)
+		rcu_assign_pointer(sdata->default_multicast_key, key);
 
-	if (key) {
-		ieee80211_debugfs_key_remove_default(key->sdata);
-		ieee80211_debugfs_key_add_default(key->sdata);
-	}
+	ieee80211_debugfs_key_update_default(sdata);
 }
 
-void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx)
+void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
+			       bool uni, bool multi)
 {
 	mutex_lock(&sdata->local->key_mtx);
-	__ieee80211_set_default_key(sdata, idx);
+	__ieee80211_set_default_key(sdata, idx, uni, multi);
 	mutex_unlock(&sdata->local->key_mtx);
 }
 
@@ -167,10 +217,7 @@ __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 
 	rcu_assign_pointer(sdata->default_mgmt_key, key);
 
-	if (key) {
-		ieee80211_debugfs_key_remove_mgmt_default(key->sdata);
-		ieee80211_debugfs_key_add_mgmt_default(key->sdata);
-	}
+	ieee80211_debugfs_key_update_default(sdata);
 }
 
 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
@@ -184,16 +231,24 @@ 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)
 {
-	int idx, defkey, defmgmtkey;
+	int idx;
+	bool defunikey, defmultikey, defmgmtkey;
 
 	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);
 
@@ -202,45 +257,45 @@ static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 		else
 			idx = new->conf.keyidx;
 
-		defkey = old && sdata->default_key == old;
+		defunikey = old && sdata->default_unicast_key == old;
+		defmultikey = old && sdata->default_multicast_key == old;
 		defmgmtkey = old && sdata->default_mgmt_key == old;
 
-		if (defkey && !new)
-			__ieee80211_set_default_key(sdata, -1);
+		if (defunikey && !new)
+			__ieee80211_set_default_key(sdata, -1, true, false);
+		if (defmultikey && !new)
+			__ieee80211_set_default_key(sdata, -1, false, true);
 		if (defmgmtkey && !new)
 			__ieee80211_set_default_mgmt_key(sdata, -1);
 
 		rcu_assign_pointer(sdata->keys[idx], new);
-		if (defkey && new)
-			__ieee80211_set_default_key(sdata, new->conf.keyidx);
+		if (defunikey && new)
+			__ieee80211_set_default_key(sdata, new->conf.keyidx,
+						    true, false);
+		if (defmultikey && new)
+			__ieee80211_set_default_key(sdata, new->conf.keyidx,
+						    false, true);
 		if (defmgmtkey && new)
 			__ieee80211_set_default_mgmt_key(sdata,
 							 new->conf.keyidx);
 	}
 
-	if (old) {
-		/*
-		 * We'll use an empty list to indicate that the key
-		 * has already been removed.
-		 */
-		list_del_init(&old->list);
-	}
+	if (old)
+		list_del(&old->list);
 }
 
-struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
-					  int idx,
-					  size_t key_len,
+struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 					  const u8 *key_data,
 					  size_t seq_len, const u8 *seq)
 {
 	struct ieee80211_key *key;
-	int i, j;
+	int i, j, err;
 
 	BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
 
 	key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
 	if (!key)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	/*
 	 * Default to software encryption; we'll later upload the
@@ -249,15 +304,16 @@ struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
 	key->conf.flags = 0;
 	key->flags = 0;
 
-	key->conf.alg = alg;
+	key->conf.cipher = cipher;
 	key->conf.keyidx = idx;
 	key->conf.keylen = key_len;
-	switch (alg) {
-	case ALG_WEP:
+	switch (cipher) {
+	case WLAN_CIPHER_SUITE_WEP40:
+	case WLAN_CIPHER_SUITE_WEP104:
 		key->conf.iv_len = WEP_IV_LEN;
 		key->conf.icv_len = WEP_ICV_LEN;
 		break;
-	case ALG_TKIP:
+	case WLAN_CIPHER_SUITE_TKIP:
 		key->conf.iv_len = TKIP_IV_LEN;
 		key->conf.icv_len = TKIP_ICV_LEN;
 		if (seq) {
@@ -269,7 +325,7 @@ struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
 			}
 		}
 		break;
-	case ALG_CCMP:
+	case WLAN_CIPHER_SUITE_CCMP:
 		key->conf.iv_len = CCMP_HDR_LEN;
 		key->conf.icv_len = CCMP_MIC_LEN;
 		if (seq) {
@@ -278,42 +334,38 @@ struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
 					key->u.ccmp.rx_pn[i][j] =
 						seq[CCMP_PN_LEN - j - 1];
 		}
-		break;
-	case ALG_AES_CMAC:
-		key->conf.iv_len = 0;
-		key->conf.icv_len = sizeof(struct ieee80211_mmie);
-		if (seq)
-			for (j = 0; j < 6; j++)
-				key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1];
-		break;
-	}
-	memcpy(key->conf.key, key_data, key_len);
-	INIT_LIST_HEAD(&key->list);
-
-	if (alg == ALG_CCMP) {
 		/*
 		 * Initialize AES key state here as an optimization so that
 		 * it does not need to be initialized for every packet.
 		 */
 		key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
-		if (!key->u.ccmp.tfm) {
+		if (IS_ERR(key->u.ccmp.tfm)) {
+			err = PTR_ERR(key->u.ccmp.tfm);
 			kfree(key);
-			return NULL;
+			key = ERR_PTR(err);
 		}
-	}
-
-	if (alg == ALG_AES_CMAC) {
+		break;
+	case WLAN_CIPHER_SUITE_AES_CMAC:
+		key->conf.iv_len = 0;
+		key->conf.icv_len = sizeof(struct ieee80211_mmie);
+		if (seq)
+			for (j = 0; j < 6; j++)
+				key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1];
 		/*
 		 * Initialize AES key state here as an optimization so that
 		 * it does not need to be initialized for every packet.
 		 */
 		key->u.aes_cmac.tfm =
 			ieee80211_aes_cmac_key_setup(key_data);
-		if (!key->u.aes_cmac.tfm) {
+		if (IS_ERR(key->u.aes_cmac.tfm)) {
+			err = PTR_ERR(key->u.aes_cmac.tfm);
 			kfree(key);
-			return NULL;
+			key = ERR_PTR(err);
 		}
+		break;
 	}
+	memcpy(key->conf.key, key_data, key_len);
+	INIT_LIST_HEAD(&key->list);
 
 	return key;
 }
@@ -323,12 +375,18 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
 	if (!key)
 		return;
 
+	/*
+	 * Synchronize so the TX path can no longer be using
+	 * this key before we free/remove it.
+	 */
+	synchronize_rcu();
+
 	if (key->local)
 		ieee80211_key_disable_hw_accel(key);
 
-	if (key->conf.alg == ALG_CCMP)
+	if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
 		ieee80211_aes_key_free(key->u.ccmp.tfm);
-	if (key->conf.alg == ALG_AES_CMAC)
+	if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
 	if (key->local)
 		ieee80211_debugfs_key_remove(key);
@@ -336,12 +394,13 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
 	kfree(key);
 }
 
-void ieee80211_key_link(struct ieee80211_key *key,
-			struct ieee80211_sub_if_data *sdata,
-			struct sta_info *sta)
+int ieee80211_key_link(struct ieee80211_key *key,
+		       struct ieee80211_sub_if_data *sdata,
+		       struct sta_info *sta)
 {
 	struct ieee80211_key *old_key;
-	int idx;
+	int idx, ret;
+	bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 
 	BUG_ON(!sdata);
 	BUG_ON(!key);
@@ -358,20 +417,13 @@ void 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;
 
 			/*
-			 * We're getting a sta pointer in,
-			 * so must be under RCU read lock.
+			 * We're getting a sta pointer in, so must be under
+			 * appropriate locking for sta_info_get().
 			 */
 
 			/* same here, the AP could be using QoS */
@@ -386,19 +438,23 @@ void 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);
 
-	ieee80211_key_enable_hw_accel(key);
+	ret = ieee80211_key_enable_hw_accel(key);
 
 	mutex_unlock(&sdata->local->key_mtx);
+
+	return ret;
 }
 
 static void __ieee80211_key_free(struct ieee80211_key *key)
@@ -408,7 +464,8 @@ 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);
 }
 
@@ -460,11 +517,12 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
 
 	mutex_lock(&sdata->local->key_mtx);
 
-	ieee80211_debugfs_key_remove_default(sdata);
 	ieee80211_debugfs_key_remove_mgmt_default(sdata);
 
 	list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
 		__ieee80211_key_free(key);
 
+	ieee80211_debugfs_key_update_default(sdata);
+
 	mutex_unlock(&sdata->local->key_mtx);
 }