* more details.
*/
-#include <linux/config.h>
+#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
+#include <linux/mm.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <asm/string.h>
int key_idx;
- struct crypto_tfm *tfm_arc4;
- struct crypto_tfm *tfm_michael;
+ struct crypto_blkcipher *rx_tfm_arc4;
+ struct crypto_hash *rx_tfm_michael;
+ struct crypto_blkcipher *tx_tfm_arc4;
+ struct crypto_hash *tx_tfm_michael;
/* scratch buffers for virt_to_page() (crypto API) */
u8 rx_hdr[16], tx_hdr[16];
{
struct ieee80211_tkip_data *priv;
- priv = kmalloc(sizeof(*priv), GFP_ATOMIC);
+ priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
if (priv == NULL)
goto fail;
- memset(priv, 0, sizeof(*priv));
priv->key_idx = key_idx;
- priv->tfm_arc4 = crypto_alloc_tfm("arc4", 0);
- if (priv->tfm_arc4 == NULL) {
+ priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(priv->tx_tfm_arc4)) {
printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
"crypto API arc4\n");
+ priv->tx_tfm_arc4 = NULL;
goto fail;
}
- priv->tfm_michael = crypto_alloc_tfm("michael_mic", 0);
- if (priv->tfm_michael == NULL) {
+ priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(priv->tx_tfm_michael)) {
printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
"crypto API michael_mic\n");
+ priv->tx_tfm_michael = NULL;
+ goto fail;
+ }
+
+ priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(priv->rx_tfm_arc4)) {
+ printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
+ "crypto API arc4\n");
+ priv->rx_tfm_arc4 = NULL;
+ goto fail;
+ }
+
+ priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(priv->rx_tfm_michael)) {
+ printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
+ "crypto API michael_mic\n");
+ priv->rx_tfm_michael = NULL;
goto fail;
}
fail:
if (priv) {
- if (priv->tfm_michael)
- crypto_free_tfm(priv->tfm_michael);
- if (priv->tfm_arc4)
- crypto_free_tfm(priv->tfm_arc4);
+ if (priv->tx_tfm_michael)
+ crypto_free_hash(priv->tx_tfm_michael);
+ if (priv->tx_tfm_arc4)
+ crypto_free_blkcipher(priv->tx_tfm_arc4);
+ if (priv->rx_tfm_michael)
+ crypto_free_hash(priv->rx_tfm_michael);
+ if (priv->rx_tfm_arc4)
+ crypto_free_blkcipher(priv->rx_tfm_arc4);
kfree(priv);
}
static void ieee80211_tkip_deinit(void *priv)
{
struct ieee80211_tkip_data *_priv = priv;
- if (_priv && _priv->tfm_michael)
- crypto_free_tfm(_priv->tfm_michael);
- if (_priv && _priv->tfm_arc4)
- crypto_free_tfm(_priv->tfm_arc4);
+ if (_priv) {
+ if (_priv->tx_tfm_michael)
+ crypto_free_hash(_priv->tx_tfm_michael);
+ if (_priv->tx_tfm_arc4)
+ crypto_free_blkcipher(_priv->tx_tfm_arc4);
+ if (_priv->rx_tfm_michael)
+ crypto_free_hash(_priv->rx_tfm_michael);
+ if (_priv->rx_tfm_arc4)
+ crypto_free_blkcipher(_priv->rx_tfm_arc4);
+ }
kfree(priv);
}
#endif
}
-static u8 *ieee80211_tkip_hdr(struct sk_buff *skb, int hdr_len, void *priv)
+static int ieee80211_tkip_hdr(struct sk_buff *skb, int hdr_len,
+ u8 * rc4key, int keylen, void *priv)
{
struct ieee80211_tkip_data *tkey = priv;
int len;
- u8 *rc4key, *pos, *icv;
+ u8 *pos;
struct ieee80211_hdr_4addr *hdr;
- u32 crc;
hdr = (struct ieee80211_hdr_4addr *)skb->data;
if (skb_headroom(skb) < 8 || skb->len < hdr_len)
- return NULL;
+ return -1;
+
+ if (rc4key == NULL || keylen < 16)
+ return -1;
if (!tkey->tx_phase1_done) {
tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2,
tkey->tx_iv32);
tkey->tx_phase1_done = 1;
}
- rc4key = kmalloc(16, GFP_ATOMIC);
- if (!rc4key)
- return NULL;
tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16);
len = skb->len - hdr_len;
pos = skb_push(skb, 8);
memmove(pos, pos + 8, hdr_len);
pos += hdr_len;
- icv = skb_put(skb, 4);
*pos++ = *rc4key;
*pos++ = *(rc4key + 1);
*pos++ = (tkey->tx_iv32 >> 16) & 0xff;
*pos++ = (tkey->tx_iv32 >> 24) & 0xff;
- crc = ~crc32_le(~0, pos, len);
- icv[0] = crc;
- icv[1] = crc >> 8;
- icv[2] = crc >> 16;
- icv[3] = crc >> 24;
+ tkey->tx_iv16++;
+ if (tkey->tx_iv16 == 0) {
+ tkey->tx_phase1_done = 0;
+ tkey->tx_iv32++;
+ }
- return rc4key;
+ return 8;
}
static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
{
struct ieee80211_tkip_data *tkey = priv;
+ struct blkcipher_desc desc = { .tfm = tkey->tx_tfm_arc4 };
int len;
- const u8 *rc4key;
- u8 *pos;
+ u8 rc4key[16], *pos, *icv;
+ u32 crc;
struct scatterlist sg;
if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) {
if (net_ratelimit()) {
struct ieee80211_hdr_4addr *hdr =
(struct ieee80211_hdr_4addr *)skb->data;
- printk(KERN_DEBUG "TKIP countermeasures: dropped "
+ printk(KERN_DEBUG ": TKIP countermeasures: dropped "
"TX packet to " MAC_FMT "\n",
MAC_ARG(hdr->addr1));
}
len = skb->len - hdr_len;
pos = skb->data + hdr_len;
- rc4key = ieee80211_tkip_hdr(skb, hdr_len, priv);
- if (!rc4key)
+ if ((ieee80211_tkip_hdr(skb, hdr_len, rc4key, 16, priv)) < 0)
return -1;
- crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16);
+ icv = skb_put(skb, 4);
+
+ crc = ~crc32_le(~0, pos, len);
+ icv[0] = crc;
+ icv[1] = crc >> 8;
+ icv[2] = crc >> 16;
+ icv[3] = crc >> 24;
+
+ crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
sg.page = virt_to_page(pos);
sg.offset = offset_in_page(pos);
sg.length = len + 4;
- crypto_cipher_encrypt(tkey->tfm_arc4, &sg, &sg, len + 4);
-
- tkey->tx_iv16++;
- if (tkey->tx_iv16 == 0) {
- tkey->tx_phase1_done = 0;
- tkey->tx_iv32++;
- }
+ return crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
+}
+/*
+ * deal with seq counter wrapping correctly.
+ * refer to timer_after() for jiffies wrapping handling
+ */
+static inline int tkip_replay_check(u32 iv32_n, u16 iv16_n,
+ u32 iv32_o, u16 iv16_o)
+{
+ if ((s32)iv32_n - (s32)iv32_o < 0 ||
+ (iv32_n == iv32_o && iv16_n <= iv16_o))
+ return 1;
return 0;
}
static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
{
struct ieee80211_tkip_data *tkey = priv;
+ struct blkcipher_desc desc = { .tfm = tkey->rx_tfm_arc4 };
u8 rc4key[16];
u8 keyidx, *pos;
u32 iv32;
if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) {
if (net_ratelimit()) {
- printk(KERN_DEBUG "TKIP countermeasures: dropped "
+ printk(KERN_DEBUG ": TKIP countermeasures: dropped "
"received packet from " MAC_FMT "\n",
MAC_ARG(hdr->addr2));
}
iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
pos += 8;
- if (iv32 < tkey->rx_iv32 ||
- (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) {
+ if (tkip_replay_check(iv32, iv16, tkey->rx_iv32, tkey->rx_iv16)) {
if (net_ratelimit()) {
printk(KERN_DEBUG "TKIP: replay detected: STA=" MAC_FMT
" previous TSC %08x%04x received TSC "
plen = skb->len - hdr_len - 12;
- crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16);
+ crypto_blkcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16);
sg.page = virt_to_page(pos);
sg.offset = offset_in_page(pos);
sg.length = plen + 4;
- crypto_cipher_decrypt(tkey->tfm_arc4, &sg, &sg, plen + 4);
+ if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) {
+ if (net_ratelimit()) {
+ printk(KERN_DEBUG ": TKIP: failed to decrypt "
+ "received packet from " MAC_FMT "\n",
+ MAC_ARG(hdr->addr2));
+ }
+ return -7;
+ }
crc = ~crc32_le(~0, pos, plen);
icv[0] = crc;
return keyidx;
}
-static int michael_mic(struct ieee80211_tkip_data *tkey, u8 * key, u8 * hdr,
+static int michael_mic(struct crypto_hash *tfm_michael, u8 * key, u8 * hdr,
u8 * data, size_t data_len, u8 * mic)
{
+ struct hash_desc desc;
struct scatterlist sg[2];
- if (tkey->tfm_michael == NULL) {
+ if (tfm_michael == NULL) {
printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n");
return -1;
}
sg[1].offset = offset_in_page(data);
sg[1].length = data_len;
- crypto_digest_init(tkey->tfm_michael);
- crypto_digest_setkey(tkey->tfm_michael, key, 8);
- crypto_digest_update(tkey->tfm_michael, sg, 2);
- crypto_digest_final(tkey->tfm_michael, mic);
+ if (crypto_hash_setkey(tfm_michael, key, 8))
+ return -1;
- return 0;
+ desc.tfm = tfm_michael;
+ desc.flags = 0;
+ return crypto_hash_digest(&desc, sg, data_len + 16, mic);
}
static void michael_mic_hdr(struct sk_buff *skb, u8 * hdr)
{
struct ieee80211_hdr_4addr *hdr11;
+ u16 stype;
hdr11 = (struct ieee80211_hdr_4addr *)skb->data;
+ stype = WLAN_FC_GET_STYPE(le16_to_cpu(hdr11->frame_ctl));
+
switch (le16_to_cpu(hdr11->frame_ctl) &
(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
case IEEE80211_FCTL_TODS:
break;
}
- hdr[12] = 0; /* priority */
+ if (stype & IEEE80211_STYPE_QOS_DATA) {
+ const struct ieee80211_hdr_3addrqos *qoshdr =
+ (struct ieee80211_hdr_3addrqos *)skb->data;
+ hdr[12] = qoshdr->qos_ctl & cpu_to_le16(IEEE80211_QCTL_TID);
+ } else
+ hdr[12] = 0; /* priority */
+
hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */
}
michael_mic_hdr(skb, tkey->tx_hdr);
pos = skb_put(skb, 8);
- if (michael_mic(tkey, &tkey->key[16], tkey->tx_hdr,
+ if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr,
skb->data + hdr_len, skb->len - 8 - hdr_len, pos))
return -1;
return -1;
michael_mic_hdr(skb, tkey->rx_hdr);
- if (michael_mic(tkey, &tkey->key[24], tkey->rx_hdr,
+ if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr,
skb->data + hdr_len, skb->len - 8 - hdr_len, mic))
return -1;
if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) {
{
struct ieee80211_tkip_data *tkey = priv;
int keyidx;
- struct crypto_tfm *tfm = tkey->tfm_michael;
- struct crypto_tfm *tfm2 = tkey->tfm_arc4;
+ struct crypto_hash *tfm = tkey->tx_tfm_michael;
+ struct crypto_blkcipher *tfm2 = tkey->tx_tfm_arc4;
+ struct crypto_hash *tfm3 = tkey->rx_tfm_michael;
+ struct crypto_blkcipher *tfm4 = tkey->rx_tfm_arc4;
keyidx = tkey->key_idx;
memset(tkey, 0, sizeof(*tkey));
tkey->key_idx = keyidx;
- tkey->tfm_michael = tfm;
- tkey->tfm_arc4 = tfm2;
+ tkey->tx_tfm_michael = tfm;
+ tkey->tx_tfm_arc4 = tfm2;
+ tkey->rx_tfm_michael = tfm3;
+ tkey->rx_tfm_arc4 = tfm4;
if (len == TKIP_KEY_LEN) {
memcpy(tkey->key, key, TKIP_KEY_LEN);
tkey->key_set = 1;
.name = "TKIP",
.init = ieee80211_tkip_init,
.deinit = ieee80211_tkip_deinit,
+ .build_iv = ieee80211_tkip_hdr,
.encrypt_mpdu = ieee80211_tkip_encrypt,
.decrypt_mpdu = ieee80211_tkip_decrypt,
.encrypt_msdu = ieee80211_michael_mic_add,
git://git.onelab.eu / linux-2.6.git / blobdiff