mac80211: Support BIGTK configuration for Beacon protection
Extend mac80211 key configuration to support the new BIGTK with key index values 6 and 7. Support for actually protecting Beacon frames (adding the MME in AP mode and checking it in STA mode) is covered in separate commits. Signed-off-by: Jouni Malinen <jouni@codeaurora.org> Link: https://lore.kernel.org/r/20200222132548.20835-3-jouni@codeaurora.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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@ -568,7 +568,8 @@ static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
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if (pairwise && key_idx < NUM_DEFAULT_KEYS)
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key = rcu_dereference(sta->ptk[key_idx]);
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else if (!pairwise &&
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key_idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
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key_idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
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NUM_DEFAULT_BEACON_KEYS)
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key = rcu_dereference(sta->gtk[key_idx]);
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} else
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key = rcu_dereference(sdata->keys[key_idx]);
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@ -680,6 +681,17 @@ static int ieee80211_config_default_mgmt_key(struct wiphy *wiphy,
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return 0;
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}
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static int ieee80211_config_default_beacon_key(struct wiphy *wiphy,
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struct net_device *dev,
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u8 key_idx)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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ieee80211_set_default_beacon_key(sdata, key_idx);
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return 0;
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}
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void sta_set_rate_info_tx(struct sta_info *sta,
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const struct ieee80211_tx_rate *rate,
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struct rate_info *rinfo)
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@ -3885,6 +3897,7 @@ const struct cfg80211_ops mac80211_config_ops = {
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.get_key = ieee80211_get_key,
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.set_default_key = ieee80211_config_default_key,
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.set_default_mgmt_key = ieee80211_config_default_mgmt_key,
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.set_default_beacon_key = ieee80211_config_default_beacon_key,
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.start_ap = ieee80211_start_ap,
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.change_beacon = ieee80211_change_beacon,
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.stop_ap = ieee80211_stop_ap,
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@ -433,6 +433,37 @@ void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sda
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sdata->debugfs.default_mgmt_key = NULL;
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}
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void
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ieee80211_debugfs_key_add_beacon_default(struct ieee80211_sub_if_data *sdata)
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{
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char buf[50];
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struct ieee80211_key *key;
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if (!sdata->vif.debugfs_dir)
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return;
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key = key_mtx_dereference(sdata->local,
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sdata->default_beacon_key);
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if (key) {
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sprintf(buf, "../keys/%d", key->debugfs.cnt);
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sdata->debugfs.default_beacon_key =
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debugfs_create_symlink("default_beacon_key",
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sdata->vif.debugfs_dir, buf);
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} else {
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ieee80211_debugfs_key_remove_beacon_default(sdata);
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}
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}
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void
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ieee80211_debugfs_key_remove_beacon_default(struct ieee80211_sub_if_data *sdata)
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{
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if (!sdata)
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return;
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debugfs_remove(sdata->debugfs.default_beacon_key);
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sdata->debugfs.default_beacon_key = NULL;
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}
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void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
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struct sta_info *sta)
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{
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@ -10,6 +10,10 @@ void ieee80211_debugfs_key_add_mgmt_default(
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struct ieee80211_sub_if_data *sdata);
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void ieee80211_debugfs_key_remove_mgmt_default(
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struct ieee80211_sub_if_data *sdata);
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void ieee80211_debugfs_key_add_beacon_default(
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struct ieee80211_sub_if_data *sdata);
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void ieee80211_debugfs_key_remove_beacon_default(
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struct ieee80211_sub_if_data *sdata);
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void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
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struct sta_info *sta);
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#else
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@ -26,6 +30,12 @@ static inline void ieee80211_debugfs_key_add_mgmt_default(
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static inline void ieee80211_debugfs_key_remove_mgmt_default(
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struct ieee80211_sub_if_data *sdata)
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{}
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static inline void ieee80211_debugfs_key_add_beacon_default(
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struct ieee80211_sub_if_data *sdata)
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{}
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static inline void ieee80211_debugfs_key_remove_beacon_default(
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struct ieee80211_sub_if_data *sdata)
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{}
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static inline void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
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struct sta_info *sta)
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{}
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@ -901,10 +901,13 @@ struct ieee80211_sub_if_data {
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/* bit field of ACM bits (BIT(802.1D tag)) */
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u8 wmm_acm;
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struct ieee80211_key __rcu *keys[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
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struct ieee80211_key __rcu *keys[NUM_DEFAULT_KEYS +
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NUM_DEFAULT_MGMT_KEYS +
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NUM_DEFAULT_BEACON_KEYS];
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struct ieee80211_key __rcu *default_unicast_key;
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struct ieee80211_key __rcu *default_multicast_key;
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struct ieee80211_key __rcu *default_mgmt_key;
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struct ieee80211_key __rcu *default_beacon_key;
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u16 sequence_number;
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__be16 control_port_protocol;
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@ -978,6 +981,7 @@ struct ieee80211_sub_if_data {
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struct dentry *default_unicast_key;
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struct dentry *default_multicast_key;
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struct dentry *default_mgmt_key;
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struct dentry *default_beacon_key;
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} debugfs;
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#endif
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@ -407,6 +407,31 @@ void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
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mutex_unlock(&sdata->local->key_mtx);
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}
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static void
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__ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata, int idx)
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{
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struct ieee80211_key *key = NULL;
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assert_key_lock(sdata->local);
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if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
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idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
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NUM_DEFAULT_BEACON_KEYS)
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key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
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rcu_assign_pointer(sdata->default_beacon_key, key);
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ieee80211_debugfs_key_update_default(sdata);
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}
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void ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata,
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int idx)
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{
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mutex_lock(&sdata->local->key_mtx);
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__ieee80211_set_default_beacon_key(sdata, idx);
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mutex_unlock(&sdata->local->key_mtx);
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}
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static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta,
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bool pairwise,
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@ -415,7 +440,7 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
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{
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int idx;
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int ret = 0;
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bool defunikey, defmultikey, defmgmtkey;
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bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
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/* caller must provide at least one old/new */
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if (WARN_ON(!new && !old))
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@ -480,6 +505,9 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
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defmgmtkey = old &&
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old == key_mtx_dereference(sdata->local,
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sdata->default_mgmt_key);
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defbeaconkey = old &&
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old == key_mtx_dereference(sdata->local,
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sdata->default_beacon_key);
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if (defunikey && !new)
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__ieee80211_set_default_key(sdata, -1, true, false);
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@ -487,6 +515,8 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
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__ieee80211_set_default_key(sdata, -1, false, true);
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if (defmgmtkey && !new)
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__ieee80211_set_default_mgmt_key(sdata, -1);
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if (defbeaconkey && !new)
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__ieee80211_set_default_beacon_key(sdata, -1);
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rcu_assign_pointer(sdata->keys[idx], new);
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if (defunikey && new)
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@ -498,6 +528,9 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
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if (defmgmtkey && new)
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__ieee80211_set_default_mgmt_key(sdata,
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new->conf.keyidx);
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if (defbeaconkey && new)
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__ieee80211_set_default_beacon_key(sdata,
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new->conf.keyidx);
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}
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if (old)
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@ -515,7 +548,9 @@ ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
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struct ieee80211_key *key;
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int i, j, err;
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if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
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if (WARN_ON(idx < 0 ||
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idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
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NUM_DEFAULT_BEACON_KEYS))
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return ERR_PTR(-EINVAL);
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key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
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@ -978,6 +1013,7 @@ static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
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sdata->crypto_tx_tailroom_pending_dec = 0;
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ieee80211_debugfs_key_remove_mgmt_default(sdata);
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ieee80211_debugfs_key_remove_beacon_default(sdata);
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list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
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ieee80211_key_replace(key->sdata, key->sta,
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@ -17,6 +17,7 @@
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#define NUM_DEFAULT_KEYS 4
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#define NUM_DEFAULT_MGMT_KEYS 2
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#define NUM_DEFAULT_BEACON_KEYS 2
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#define INVALID_PTK_KEYIDX 2 /* Keyidx always pointing to a NULL key for PTK */
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struct ieee80211_local;
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@ -153,6 +154,8 @@ void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
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bool uni, bool multi);
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void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
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int idx);
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void ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata,
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int idx);
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void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
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bool force_synchronize);
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void ieee80211_free_sta_keys(struct ieee80211_local *local,
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@ -533,7 +533,9 @@ struct sta_info {
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u8 addr[ETH_ALEN];
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struct ieee80211_local *local;
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
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struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS +
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NUM_DEFAULT_MGMT_KEYS +
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NUM_DEFAULT_BEACON_KEYS];
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struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
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u8 ptk_idx;
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struct rate_control_ref *rate_ctrl;
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