X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fieee80211%2Fieee80211_crypt_tkip.c;h=fc1f99a597327b7f80acd98d90e9650d78dc129c;hb=refs%2Fheads%2Fvserver;hp=34dba0ba545de66e55737d56390d673789d21c99;hpb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;p=linux-2.6.git diff --git a/net/ieee80211/ieee80211_crypt_tkip.c b/net/ieee80211/ieee80211_crypt_tkip.c index 34dba0ba5..fc1f99a59 100644 --- a/net/ieee80211/ieee80211_crypt_tkip.c +++ b/net/ieee80211/ieee80211_crypt_tkip.c @@ -9,12 +9,14 @@ * more details. */ +#include #include #include #include #include #include #include +#include #include #include #include @@ -52,8 +54,10 @@ struct ieee80211_tkip_data { 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]; @@ -85,17 +89,39 @@ static void *ieee80211_tkip_init(int key_idx) 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; } @@ -103,10 +129,14 @@ static void *ieee80211_tkip_init(int key_idx) 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); } @@ -116,10 +146,16 @@ static void *ieee80211_tkip_init(int key_idx) 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); } @@ -318,6 +354,7 @@ static int ieee80211_tkip_hdr(struct sk_buff *skb, int hdr_len, 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; u8 rc4key[16], *pos, *icv; u32 crc; @@ -351,18 +388,30 @@ static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) icv[2] = crc >> 16; icv[3] = crc >> 24; - crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16); + 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); + 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; @@ -414,8 +463,7 @@ static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) 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 " @@ -434,11 +482,18 @@ static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) 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; @@ -472,12 +527,13 @@ static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) 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; } @@ -489,12 +545,12 @@ static int michael_mic(struct ieee80211_tkip_data *tkey, u8 * key, u8 * hdr, 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) @@ -528,7 +584,7 @@ static void michael_mic_hdr(struct sk_buff *skb, u8 * hdr) if (stype & IEEE80211_STYPE_QOS_DATA) { const struct ieee80211_hdr_3addrqos *qoshdr = (struct ieee80211_hdr_3addrqos *)skb->data; - hdr[12] = le16_to_cpu(qoshdr->qos_ctl) & IEEE80211_QCTL_TID; + hdr[12] = qoshdr->qos_ctl & cpu_to_le16(IEEE80211_QCTL_TID); } else hdr[12] = 0; /* priority */ @@ -550,7 +606,7 @@ static int ieee80211_michael_mic_add(struct sk_buff *skb, int hdr_len, 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; @@ -588,7 +644,7 @@ static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx, 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) { @@ -618,14 +674,18 @@ static int ieee80211_tkip_set_key(void *key, int len, u8 * seq, void *priv) { 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;