mac80211: 802.11w - Use BIP (AES-128-CMAC)
Add mechanism for managing BIP keys (IGTK) and integrate BIP into the
TX/RX paths.
Signed-off-by: Jouni Malinen <j@w1.fi>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index b0a025c..19b480d 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -18,6 +18,7 @@
#include "ieee80211_i.h"
#include "debugfs_key.h"
#include "aes_ccm.h"
+#include "aes_cmac.h"
/**
@@ -215,13 +216,38 @@
spin_unlock_irqrestore(&sdata->local->key_lock, flags);
}
+static void
+__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
+{
+ struct ieee80211_key *key = NULL;
+
+ if (idx >= NUM_DEFAULT_KEYS &&
+ idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
+ key = sdata->keys[idx];
+
+ rcu_assign_pointer(sdata->default_mgmt_key, key);
+
+ if (key)
+ add_todo(key, KEY_FLAG_TODO_DEFMGMTKEY);
+}
+
+void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
+ int idx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&sdata->local->key_lock, flags);
+ __ieee80211_set_default_mgmt_key(sdata, idx);
+ spin_unlock_irqrestore(&sdata->local->key_lock, flags);
+}
+
static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
struct ieee80211_key *old,
struct ieee80211_key *new)
{
- int idx, defkey;
+ int idx, defkey, defmgmtkey;
if (new)
list_add(&new->list, &sdata->key_list);
@@ -237,13 +263,19 @@
idx = new->conf.keyidx;
defkey = old && sdata->default_key == old;
+ defmgmtkey = old && sdata->default_mgmt_key == old;
if (defkey && !new)
__ieee80211_set_default_key(sdata, -1);
+ 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 (defmgmtkey && new)
+ __ieee80211_set_default_mgmt_key(sdata,
+ new->conf.keyidx);
}
if (old) {
@@ -262,7 +294,7 @@
{
struct ieee80211_key *key;
- BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS);
+ BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
if (!key)
@@ -291,6 +323,10 @@
key->conf.iv_len = CCMP_HDR_LEN;
key->conf.icv_len = CCMP_MIC_LEN;
break;
+ case ALG_AES_CMAC:
+ key->conf.iv_len = 0;
+ key->conf.icv_len = sizeof(struct ieee80211_mmie);
+ break;
}
memcpy(key->conf.key, key_data, key_len);
INIT_LIST_HEAD(&key->list);
@@ -308,6 +344,19 @@
}
}
+ if (alg == ALG_AES_CMAC) {
+ /*
+ * 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) {
+ kfree(key);
+ return NULL;
+ }
+ }
+
return key;
}
@@ -461,6 +510,8 @@
if (key->conf.alg == ALG_CCMP)
ieee80211_aes_key_free(key->u.ccmp.tfm);
+ if (key->conf.alg == ALG_AES_CMAC)
+ ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
ieee80211_debugfs_key_remove(key);
kfree(key);
@@ -483,6 +534,7 @@
list_del_init(&key->todo);
todoflags = key->flags & (KEY_FLAG_TODO_ADD_DEBUGFS |
KEY_FLAG_TODO_DEFKEY |
+ KEY_FLAG_TODO_DEFMGMTKEY |
KEY_FLAG_TODO_HWACCEL_ADD |
KEY_FLAG_TODO_HWACCEL_REMOVE |
KEY_FLAG_TODO_DELETE);
@@ -500,6 +552,11 @@
ieee80211_debugfs_key_add_default(key->sdata);
work_done = true;
}
+ if (todoflags & KEY_FLAG_TODO_DEFMGMTKEY) {
+ ieee80211_debugfs_key_remove_mgmt_default(key->sdata);
+ ieee80211_debugfs_key_add_mgmt_default(key->sdata);
+ work_done = true;
+ }
if (todoflags & KEY_FLAG_TODO_HWACCEL_ADD) {
ieee80211_key_enable_hw_accel(key);
work_done = true;
@@ -535,6 +592,7 @@
ieee80211_key_lock();
ieee80211_debugfs_key_remove_default(sdata);
+ ieee80211_debugfs_key_remove_mgmt_default(sdata);
spin_lock_irqsave(&sdata->local->key_lock, flags);
list_for_each_entry_safe(key, tmp, &sdata->key_list, list)