From: Jouni Malinen Date: Sat, 22 Feb 2020 13:25:44 +0000 (+0200) Subject: mac80211: Support BIGTK configuration for Beacon protection X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e5473e80d46767ebc64dac4958f30299a3b14b1b;p=openwrt%2Fstaging%2Fblogic.git 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 Link: https://lore.kernel.org/r/20200222132548.20835-3-jouni@codeaurora.org Signed-off-by: Johannes Berg --- diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index a66eff1ee26a..a762ba6e4c5d 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -568,7 +568,8 @@ static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev, if (pairwise && key_idx < NUM_DEFAULT_KEYS) key = rcu_dereference(sta->ptk[key_idx]); else if (!pairwise && - key_idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) + key_idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + + NUM_DEFAULT_BEACON_KEYS) key = rcu_dereference(sta->gtk[key_idx]); } else key = rcu_dereference(sdata->keys[key_idx]); @@ -680,6 +681,17 @@ static int ieee80211_config_default_mgmt_key(struct wiphy *wiphy, return 0; } +static int ieee80211_config_default_beacon_key(struct wiphy *wiphy, + struct net_device *dev, + u8 key_idx) +{ + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + + ieee80211_set_default_beacon_key(sdata, key_idx); + + return 0; +} + void sta_set_rate_info_tx(struct sta_info *sta, const struct ieee80211_tx_rate *rate, struct rate_info *rinfo) @@ -3885,6 +3897,7 @@ const struct cfg80211_ops mac80211_config_ops = { .get_key = ieee80211_get_key, .set_default_key = ieee80211_config_default_key, .set_default_mgmt_key = ieee80211_config_default_mgmt_key, + .set_default_beacon_key = ieee80211_config_default_beacon_key, .start_ap = ieee80211_start_ap, .change_beacon = ieee80211_change_beacon, .stop_ap = ieee80211_stop_ap, diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c index 7b8735ced2a1..98a713475e0f 100644 --- a/net/mac80211/debugfs_key.c +++ b/net/mac80211/debugfs_key.c @@ -433,6 +433,37 @@ void ieee80211_debugfs_key_remove_mgmt_default(struct ieee80211_sub_if_data *sda sdata->debugfs.default_mgmt_key = NULL; } +void +ieee80211_debugfs_key_add_beacon_default(struct ieee80211_sub_if_data *sdata) +{ + char buf[50]; + struct ieee80211_key *key; + + if (!sdata->vif.debugfs_dir) + return; + + key = key_mtx_dereference(sdata->local, + sdata->default_beacon_key); + if (key) { + sprintf(buf, "../keys/%d", key->debugfs.cnt); + sdata->debugfs.default_beacon_key = + debugfs_create_symlink("default_beacon_key", + sdata->vif.debugfs_dir, buf); + } else { + ieee80211_debugfs_key_remove_beacon_default(sdata); + } +} + +void +ieee80211_debugfs_key_remove_beacon_default(struct ieee80211_sub_if_data *sdata) +{ + if (!sdata) + return; + + debugfs_remove(sdata->debugfs.default_beacon_key); + sdata->debugfs.default_beacon_key = NULL; +} + void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key, struct sta_info *sta) { diff --git a/net/mac80211/debugfs_key.h b/net/mac80211/debugfs_key.h index 1cd7b8bff56c..af7cf495f8d1 100644 --- a/net/mac80211/debugfs_key.h +++ b/net/mac80211/debugfs_key.h @@ -10,6 +10,10 @@ void ieee80211_debugfs_key_add_mgmt_default( struct ieee80211_sub_if_data *sdata); void ieee80211_debugfs_key_remove_mgmt_default( struct ieee80211_sub_if_data *sdata); +void ieee80211_debugfs_key_add_beacon_default( + struct ieee80211_sub_if_data *sdata); +void ieee80211_debugfs_key_remove_beacon_default( + struct ieee80211_sub_if_data *sdata); void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key, struct sta_info *sta); #else @@ -26,6 +30,12 @@ static inline void ieee80211_debugfs_key_add_mgmt_default( static inline void ieee80211_debugfs_key_remove_mgmt_default( struct ieee80211_sub_if_data *sdata) {} +static inline void ieee80211_debugfs_key_add_beacon_default( + struct ieee80211_sub_if_data *sdata) +{} +static inline void ieee80211_debugfs_key_remove_beacon_default( + struct ieee80211_sub_if_data *sdata) +{} static inline void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key, struct sta_info *sta) {} diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 8a49d78ad7c9..de39f9ca9935 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -901,10 +901,13 @@ struct ieee80211_sub_if_data { /* bit field of ACM bits (BIT(802.1D tag)) */ u8 wmm_acm; - struct ieee80211_key __rcu *keys[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS]; + struct ieee80211_key __rcu *keys[NUM_DEFAULT_KEYS + + NUM_DEFAULT_MGMT_KEYS + + NUM_DEFAULT_BEACON_KEYS]; struct ieee80211_key __rcu *default_unicast_key; struct ieee80211_key __rcu *default_multicast_key; struct ieee80211_key __rcu *default_mgmt_key; + struct ieee80211_key __rcu *default_beacon_key; u16 sequence_number; __be16 control_port_protocol; @@ -978,6 +981,7 @@ struct ieee80211_sub_if_data { struct dentry *default_unicast_key; struct dentry *default_multicast_key; struct dentry *default_mgmt_key; + struct dentry *default_beacon_key; } debugfs; #endif diff --git a/net/mac80211/key.c b/net/mac80211/key.c index 54934eff4ac1..6354491c5a09 100644 --- a/net/mac80211/key.c +++ b/net/mac80211/key.c @@ -407,6 +407,31 @@ void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, mutex_unlock(&sdata->local->key_mtx); } +static void +__ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata, int idx) +{ + struct ieee80211_key *key = NULL; + + assert_key_lock(sdata->local); + + if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS && + idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + + NUM_DEFAULT_BEACON_KEYS) + key = key_mtx_dereference(sdata->local, sdata->keys[idx]); + + rcu_assign_pointer(sdata->default_beacon_key, key); + + ieee80211_debugfs_key_update_default(sdata); +} + +void ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata, + int idx) +{ + mutex_lock(&sdata->local->key_mtx); + __ieee80211_set_default_beacon_key(sdata, idx); + mutex_unlock(&sdata->local->key_mtx); +} + static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, bool pairwise, @@ -415,7 +440,7 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, { int idx; int ret = 0; - bool defunikey, defmultikey, defmgmtkey; + bool defunikey, defmultikey, defmgmtkey, defbeaconkey; /* caller must provide at least one old/new */ if (WARN_ON(!new && !old)) @@ -480,6 +505,9 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, defmgmtkey = old && old == key_mtx_dereference(sdata->local, sdata->default_mgmt_key); + defbeaconkey = old && + old == key_mtx_dereference(sdata->local, + sdata->default_beacon_key); if (defunikey && !new) __ieee80211_set_default_key(sdata, -1, true, false); @@ -487,6 +515,8 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, __ieee80211_set_default_key(sdata, -1, false, true); if (defmgmtkey && !new) __ieee80211_set_default_mgmt_key(sdata, -1); + if (defbeaconkey && !new) + __ieee80211_set_default_beacon_key(sdata, -1); rcu_assign_pointer(sdata->keys[idx], new); if (defunikey && new) @@ -498,6 +528,9 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, if (defmgmtkey && new) __ieee80211_set_default_mgmt_key(sdata, new->conf.keyidx); + if (defbeaconkey && new) + __ieee80211_set_default_beacon_key(sdata, + new->conf.keyidx); } if (old) @@ -515,7 +548,9 @@ ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, struct ieee80211_key *key; int i, j, err; - if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)) + if (WARN_ON(idx < 0 || + idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + + NUM_DEFAULT_BEACON_KEYS)) return ERR_PTR(-EINVAL); key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); @@ -978,6 +1013,7 @@ static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata, sdata->crypto_tx_tailroom_pending_dec = 0; ieee80211_debugfs_key_remove_mgmt_default(sdata); + ieee80211_debugfs_key_remove_beacon_default(sdata); list_for_each_entry_safe(key, tmp, &sdata->key_list, list) { ieee80211_key_replace(key->sdata, key->sta, diff --git a/net/mac80211/key.h b/net/mac80211/key.h index d6d6e89cf7dd..7ad72e9b4991 100644 --- a/net/mac80211/key.h +++ b/net/mac80211/key.h @@ -17,6 +17,7 @@ #define NUM_DEFAULT_KEYS 4 #define NUM_DEFAULT_MGMT_KEYS 2 +#define NUM_DEFAULT_BEACON_KEYS 2 #define INVALID_PTK_KEYIDX 2 /* Keyidx always pointing to a NULL key for PTK */ struct ieee80211_local; @@ -153,6 +154,8 @@ void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, bool uni, bool multi); void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx); +void ieee80211_set_default_beacon_key(struct ieee80211_sub_if_data *sdata, + int idx); void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, bool force_synchronize); void ieee80211_free_sta_keys(struct ieee80211_local *local, diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index c00e28585f9d..364a35414d05 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -533,7 +533,9 @@ struct sta_info { u8 addr[ETH_ALEN]; struct ieee80211_local *local; struct ieee80211_sub_if_data *sdata; - struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS]; + struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + + NUM_DEFAULT_MGMT_KEYS + + NUM_DEFAULT_BEACON_KEYS]; struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS]; u8 ptk_idx; struct rate_control_ref *rate_ctrl;