![Joe Perches](/assets/img/avatar_default.png)
This is nicer than the MAC_FMT stuff. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
796 lines
21 KiB
C
796 lines
21 KiB
C
/*
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* Host AP crypt: host-based TKIP encryption implementation for Host AP driver
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*
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* Copyright (c) 2003-2004, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. See README and COPYING for
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* more details.
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/mm.h>
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#include <linux/if_ether.h>
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#include <linux/if_arp.h>
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#include <asm/string.h>
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#include <net/ieee80211.h>
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#include <linux/crypto.h>
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#include <asm/scatterlist.h>
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#include <linux/crc32.h>
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MODULE_AUTHOR("Jouni Malinen");
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MODULE_DESCRIPTION("Host AP crypt: TKIP");
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MODULE_LICENSE("GPL");
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struct ieee80211_tkip_data {
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#define TKIP_KEY_LEN 32
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u8 key[TKIP_KEY_LEN];
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int key_set;
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u32 tx_iv32;
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u16 tx_iv16;
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u16 tx_ttak[5];
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int tx_phase1_done;
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u32 rx_iv32;
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u16 rx_iv16;
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u16 rx_ttak[5];
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int rx_phase1_done;
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u32 rx_iv32_new;
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u16 rx_iv16_new;
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u32 dot11RSNAStatsTKIPReplays;
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u32 dot11RSNAStatsTKIPICVErrors;
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u32 dot11RSNAStatsTKIPLocalMICFailures;
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int key_idx;
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struct crypto_blkcipher *rx_tfm_arc4;
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struct crypto_hash *rx_tfm_michael;
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struct crypto_blkcipher *tx_tfm_arc4;
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struct crypto_hash *tx_tfm_michael;
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/* scratch buffers for virt_to_page() (crypto API) */
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u8 rx_hdr[16], tx_hdr[16];
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unsigned long flags;
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};
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static unsigned long ieee80211_tkip_set_flags(unsigned long flags, void *priv)
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{
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struct ieee80211_tkip_data *_priv = priv;
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unsigned long old_flags = _priv->flags;
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_priv->flags = flags;
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return old_flags;
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}
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static unsigned long ieee80211_tkip_get_flags(void *priv)
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{
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struct ieee80211_tkip_data *_priv = priv;
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return _priv->flags;
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}
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static void *ieee80211_tkip_init(int key_idx)
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{
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struct ieee80211_tkip_data *priv;
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priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
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if (priv == NULL)
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goto fail;
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priv->key_idx = key_idx;
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priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(priv->tx_tfm_arc4)) {
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printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
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"crypto API arc4\n");
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priv->tx_tfm_arc4 = NULL;
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goto fail;
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}
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priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(priv->tx_tfm_michael)) {
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printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
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"crypto API michael_mic\n");
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priv->tx_tfm_michael = NULL;
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goto fail;
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}
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priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(priv->rx_tfm_arc4)) {
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printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
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"crypto API arc4\n");
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priv->rx_tfm_arc4 = NULL;
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goto fail;
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}
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priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
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CRYPTO_ALG_ASYNC);
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if (IS_ERR(priv->rx_tfm_michael)) {
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printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
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"crypto API michael_mic\n");
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priv->rx_tfm_michael = NULL;
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goto fail;
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}
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return priv;
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fail:
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if (priv) {
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if (priv->tx_tfm_michael)
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crypto_free_hash(priv->tx_tfm_michael);
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if (priv->tx_tfm_arc4)
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crypto_free_blkcipher(priv->tx_tfm_arc4);
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if (priv->rx_tfm_michael)
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crypto_free_hash(priv->rx_tfm_michael);
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if (priv->rx_tfm_arc4)
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crypto_free_blkcipher(priv->rx_tfm_arc4);
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kfree(priv);
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}
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return NULL;
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}
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static void ieee80211_tkip_deinit(void *priv)
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{
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struct ieee80211_tkip_data *_priv = priv;
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if (_priv) {
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if (_priv->tx_tfm_michael)
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crypto_free_hash(_priv->tx_tfm_michael);
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if (_priv->tx_tfm_arc4)
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crypto_free_blkcipher(_priv->tx_tfm_arc4);
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if (_priv->rx_tfm_michael)
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crypto_free_hash(_priv->rx_tfm_michael);
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if (_priv->rx_tfm_arc4)
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crypto_free_blkcipher(_priv->rx_tfm_arc4);
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}
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kfree(priv);
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}
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static inline u16 RotR1(u16 val)
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{
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return (val >> 1) | (val << 15);
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}
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static inline u8 Lo8(u16 val)
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{
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return val & 0xff;
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}
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static inline u8 Hi8(u16 val)
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{
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return val >> 8;
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}
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static inline u16 Lo16(u32 val)
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{
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return val & 0xffff;
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}
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static inline u16 Hi16(u32 val)
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{
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return val >> 16;
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}
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static inline u16 Mk16(u8 hi, u8 lo)
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{
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return lo | (((u16) hi) << 8);
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}
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static inline u16 Mk16_le(u16 * v)
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{
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return le16_to_cpu(*v);
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}
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static const u16 Sbox[256] = {
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0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
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0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
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0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
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0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
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0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
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0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
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0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
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0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
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0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
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0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
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0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
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0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
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0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
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0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
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0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
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0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
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0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
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0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
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0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
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0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
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0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
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0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
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0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
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0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
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0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
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0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
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0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
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0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
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0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
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0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
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0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
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0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
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};
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static inline u16 _S_(u16 v)
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{
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u16 t = Sbox[Hi8(v)];
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return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8));
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}
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#define PHASE1_LOOP_COUNT 8
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static void tkip_mixing_phase1(u16 * TTAK, const u8 * TK, const u8 * TA,
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u32 IV32)
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{
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int i, j;
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/* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */
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TTAK[0] = Lo16(IV32);
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TTAK[1] = Hi16(IV32);
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TTAK[2] = Mk16(TA[1], TA[0]);
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TTAK[3] = Mk16(TA[3], TA[2]);
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TTAK[4] = Mk16(TA[5], TA[4]);
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for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
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j = 2 * (i & 1);
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TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j]));
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TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j]));
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TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j]));
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TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j]));
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TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i;
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}
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}
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static void tkip_mixing_phase2(u8 * WEPSeed, const u8 * TK, const u16 * TTAK,
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u16 IV16)
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{
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/* Make temporary area overlap WEP seed so that the final copy can be
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* avoided on little endian hosts. */
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u16 *PPK = (u16 *) & WEPSeed[4];
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/* Step 1 - make copy of TTAK and bring in TSC */
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PPK[0] = TTAK[0];
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PPK[1] = TTAK[1];
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PPK[2] = TTAK[2];
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PPK[3] = TTAK[3];
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PPK[4] = TTAK[4];
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PPK[5] = TTAK[4] + IV16;
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/* Step 2 - 96-bit bijective mixing using S-box */
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PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) & TK[0]));
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PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) & TK[2]));
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PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) & TK[4]));
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PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) & TK[6]));
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PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) & TK[8]));
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PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) & TK[10]));
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PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) & TK[12]));
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PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) & TK[14]));
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PPK[2] += RotR1(PPK[1]);
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PPK[3] += RotR1(PPK[2]);
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PPK[4] += RotR1(PPK[3]);
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PPK[5] += RotR1(PPK[4]);
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/* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value
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* WEPSeed[0..2] is transmitted as WEP IV */
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WEPSeed[0] = Hi8(IV16);
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WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F;
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WEPSeed[2] = Lo8(IV16);
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WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) & TK[0])) >> 1);
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#ifdef __BIG_ENDIAN
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{
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int i;
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for (i = 0; i < 6; i++)
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PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8);
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}
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#endif
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}
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static int ieee80211_tkip_hdr(struct sk_buff *skb, int hdr_len,
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u8 * rc4key, int keylen, void *priv)
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{
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struct ieee80211_tkip_data *tkey = priv;
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int len;
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u8 *pos;
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struct ieee80211_hdr_4addr *hdr;
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hdr = (struct ieee80211_hdr_4addr *)skb->data;
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if (skb_headroom(skb) < 8 || skb->len < hdr_len)
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return -1;
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if (rc4key == NULL || keylen < 16)
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return -1;
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if (!tkey->tx_phase1_done) {
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tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2,
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tkey->tx_iv32);
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tkey->tx_phase1_done = 1;
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}
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tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16);
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len = skb->len - hdr_len;
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pos = skb_push(skb, 8);
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memmove(pos, pos + 8, hdr_len);
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pos += hdr_len;
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*pos++ = *rc4key;
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*pos++ = *(rc4key + 1);
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*pos++ = *(rc4key + 2);
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*pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */ ;
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*pos++ = tkey->tx_iv32 & 0xff;
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*pos++ = (tkey->tx_iv32 >> 8) & 0xff;
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*pos++ = (tkey->tx_iv32 >> 16) & 0xff;
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*pos++ = (tkey->tx_iv32 >> 24) & 0xff;
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tkey->tx_iv16++;
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if (tkey->tx_iv16 == 0) {
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tkey->tx_phase1_done = 0;
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tkey->tx_iv32++;
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}
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return 8;
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}
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static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
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{
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struct ieee80211_tkip_data *tkey = priv;
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struct blkcipher_desc desc = { .tfm = tkey->tx_tfm_arc4 };
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int len;
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u8 rc4key[16], *pos, *icv;
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u32 crc;
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struct scatterlist sg;
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DECLARE_MAC_BUF(mac);
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if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) {
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if (net_ratelimit()) {
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struct ieee80211_hdr_4addr *hdr =
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(struct ieee80211_hdr_4addr *)skb->data;
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printk(KERN_DEBUG ": TKIP countermeasures: dropped "
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"TX packet to %s\n",
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print_mac(mac, hdr->addr1));
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}
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return -1;
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}
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if (skb_tailroom(skb) < 4 || skb->len < hdr_len)
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return -1;
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len = skb->len - hdr_len;
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pos = skb->data + hdr_len;
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if ((ieee80211_tkip_hdr(skb, hdr_len, rc4key, 16, priv)) < 0)
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return -1;
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icv = skb_put(skb, 4);
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crc = ~crc32_le(~0, pos, len);
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icv[0] = crc;
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icv[1] = crc >> 8;
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icv[2] = crc >> 16;
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icv[3] = crc >> 24;
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crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
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sg.page = virt_to_page(pos);
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sg.offset = offset_in_page(pos);
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sg.length = len + 4;
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return crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
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}
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/*
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* deal with seq counter wrapping correctly.
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* refer to timer_after() for jiffies wrapping handling
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*/
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static inline int tkip_replay_check(u32 iv32_n, u16 iv16_n,
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u32 iv32_o, u16 iv16_o)
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{
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if ((s32)iv32_n - (s32)iv32_o < 0 ||
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(iv32_n == iv32_o && iv16_n <= iv16_o))
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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;
|
|
u16 iv16;
|
|
struct ieee80211_hdr_4addr *hdr;
|
|
u8 icv[4];
|
|
u32 crc;
|
|
struct scatterlist sg;
|
|
int plen;
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
hdr = (struct ieee80211_hdr_4addr *)skb->data;
|
|
|
|
if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG ": TKIP countermeasures: dropped "
|
|
"received packet from %s\n",
|
|
print_mac(mac, hdr->addr2));
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if (skb->len < hdr_len + 8 + 4)
|
|
return -1;
|
|
|
|
pos = skb->data + hdr_len;
|
|
keyidx = pos[3];
|
|
if (!(keyidx & (1 << 5))) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG "TKIP: received packet without ExtIV"
|
|
" flag from %s\n", print_mac(mac, hdr->addr2));
|
|
}
|
|
return -2;
|
|
}
|
|
keyidx >>= 6;
|
|
if (tkey->key_idx != keyidx) {
|
|
printk(KERN_DEBUG "TKIP: RX tkey->key_idx=%d frame "
|
|
"keyidx=%d priv=%p\n", tkey->key_idx, keyidx, priv);
|
|
return -6;
|
|
}
|
|
if (!tkey->key_set) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG "TKIP: received packet from %s"
|
|
" with keyid=%d that does not have a configured"
|
|
" key\n", print_mac(mac, hdr->addr2), keyidx);
|
|
}
|
|
return -3;
|
|
}
|
|
iv16 = (pos[0] << 8) | pos[2];
|
|
iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
|
|
pos += 8;
|
|
|
|
if (tkip_replay_check(iv32, iv16, tkey->rx_iv32, tkey->rx_iv16)) {
|
|
if (net_ratelimit()) {
|
|
IEEE80211_DEBUG_DROP("TKIP: replay detected: STA=%s"
|
|
" previous TSC %08x%04x received TSC "
|
|
"%08x%04x\n", print_mac(mac, hdr->addr2),
|
|
tkey->rx_iv32, tkey->rx_iv16, iv32, iv16);
|
|
}
|
|
tkey->dot11RSNAStatsTKIPReplays++;
|
|
return -4;
|
|
}
|
|
|
|
if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) {
|
|
tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32);
|
|
tkey->rx_phase1_done = 1;
|
|
}
|
|
tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16);
|
|
|
|
plen = skb->len - hdr_len - 12;
|
|
|
|
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;
|
|
if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) {
|
|
if (net_ratelimit()) {
|
|
printk(KERN_DEBUG ": TKIP: failed to decrypt "
|
|
"received packet from %s\n",
|
|
print_mac(mac, hdr->addr2));
|
|
}
|
|
return -7;
|
|
}
|
|
|
|
crc = ~crc32_le(~0, pos, plen);
|
|
icv[0] = crc;
|
|
icv[1] = crc >> 8;
|
|
icv[2] = crc >> 16;
|
|
icv[3] = crc >> 24;
|
|
if (memcmp(icv, pos + plen, 4) != 0) {
|
|
if (iv32 != tkey->rx_iv32) {
|
|
/* Previously cached Phase1 result was already lost, so
|
|
* it needs to be recalculated for the next packet. */
|
|
tkey->rx_phase1_done = 0;
|
|
}
|
|
if (net_ratelimit()) {
|
|
IEEE80211_DEBUG_DROP("TKIP: ICV error detected: STA="
|
|
"%s\n", print_mac(mac, hdr->addr2));
|
|
}
|
|
tkey->dot11RSNAStatsTKIPICVErrors++;
|
|
return -5;
|
|
}
|
|
|
|
/* Update real counters only after Michael MIC verification has
|
|
* completed */
|
|
tkey->rx_iv32_new = iv32;
|
|
tkey->rx_iv16_new = iv16;
|
|
|
|
/* Remove IV and ICV */
|
|
memmove(skb->data + 8, skb->data, hdr_len);
|
|
skb_pull(skb, 8);
|
|
skb_trim(skb, skb->len - 4);
|
|
|
|
return keyidx;
|
|
}
|
|
|
|
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 (tfm_michael == NULL) {
|
|
printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n");
|
|
return -1;
|
|
}
|
|
sg[0].page = virt_to_page(hdr);
|
|
sg[0].offset = offset_in_page(hdr);
|
|
sg[0].length = 16;
|
|
|
|
sg[1].page = virt_to_page(data);
|
|
sg[1].offset = offset_in_page(data);
|
|
sg[1].length = data_len;
|
|
|
|
if (crypto_hash_setkey(tfm_michael, key, 8))
|
|
return -1;
|
|
|
|
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:
|
|
memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
|
|
memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
|
|
break;
|
|
case IEEE80211_FCTL_FROMDS:
|
|
memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
|
|
memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */
|
|
break;
|
|
case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
|
|
memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
|
|
memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */
|
|
break;
|
|
case 0:
|
|
memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
|
|
memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
|
|
break;
|
|
}
|
|
|
|
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 */
|
|
}
|
|
|
|
static int ieee80211_michael_mic_add(struct sk_buff *skb, int hdr_len,
|
|
void *priv)
|
|
{
|
|
struct ieee80211_tkip_data *tkey = priv;
|
|
u8 *pos;
|
|
|
|
if (skb_tailroom(skb) < 8 || skb->len < hdr_len) {
|
|
printk(KERN_DEBUG "Invalid packet for Michael MIC add "
|
|
"(tailroom=%d hdr_len=%d skb->len=%d)\n",
|
|
skb_tailroom(skb), hdr_len, skb->len);
|
|
return -1;
|
|
}
|
|
|
|
michael_mic_hdr(skb, tkey->tx_hdr);
|
|
pos = skb_put(skb, 8);
|
|
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 0;
|
|
}
|
|
|
|
static void ieee80211_michael_mic_failure(struct net_device *dev,
|
|
struct ieee80211_hdr_4addr *hdr,
|
|
int keyidx)
|
|
{
|
|
union iwreq_data wrqu;
|
|
struct iw_michaelmicfailure ev;
|
|
|
|
/* TODO: needed parameters: count, keyid, key type, TSC */
|
|
memset(&ev, 0, sizeof(ev));
|
|
ev.flags = keyidx & IW_MICFAILURE_KEY_ID;
|
|
if (hdr->addr1[0] & 0x01)
|
|
ev.flags |= IW_MICFAILURE_GROUP;
|
|
else
|
|
ev.flags |= IW_MICFAILURE_PAIRWISE;
|
|
ev.src_addr.sa_family = ARPHRD_ETHER;
|
|
memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN);
|
|
memset(&wrqu, 0, sizeof(wrqu));
|
|
wrqu.data.length = sizeof(ev);
|
|
wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *)&ev);
|
|
}
|
|
|
|
static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx,
|
|
int hdr_len, void *priv)
|
|
{
|
|
struct ieee80211_tkip_data *tkey = priv;
|
|
u8 mic[8];
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
if (!tkey->key_set)
|
|
return -1;
|
|
|
|
michael_mic_hdr(skb, 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_hdr_4addr *hdr;
|
|
hdr = (struct ieee80211_hdr_4addr *)skb->data;
|
|
printk(KERN_DEBUG "%s: Michael MIC verification failed for "
|
|
"MSDU from %s keyidx=%d\n",
|
|
skb->dev ? skb->dev->name : "N/A", print_mac(mac, hdr->addr2),
|
|
keyidx);
|
|
if (skb->dev)
|
|
ieee80211_michael_mic_failure(skb->dev, hdr, keyidx);
|
|
tkey->dot11RSNAStatsTKIPLocalMICFailures++;
|
|
return -1;
|
|
}
|
|
|
|
/* Update TSC counters for RX now that the packet verification has
|
|
* completed. */
|
|
tkey->rx_iv32 = tkey->rx_iv32_new;
|
|
tkey->rx_iv16 = tkey->rx_iv16_new;
|
|
|
|
skb_trim(skb, skb->len - 8);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ieee80211_tkip_set_key(void *key, int len, u8 * seq, void *priv)
|
|
{
|
|
struct ieee80211_tkip_data *tkey = priv;
|
|
int keyidx;
|
|
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->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;
|
|
tkey->tx_iv16 = 1; /* TSC is initialized to 1 */
|
|
if (seq) {
|
|
tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) |
|
|
(seq[3] << 8) | seq[2];
|
|
tkey->rx_iv16 = (seq[1] << 8) | seq[0];
|
|
}
|
|
} else if (len == 0)
|
|
tkey->key_set = 0;
|
|
else
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ieee80211_tkip_get_key(void *key, int len, u8 * seq, void *priv)
|
|
{
|
|
struct ieee80211_tkip_data *tkey = priv;
|
|
|
|
if (len < TKIP_KEY_LEN)
|
|
return -1;
|
|
|
|
if (!tkey->key_set)
|
|
return 0;
|
|
memcpy(key, tkey->key, TKIP_KEY_LEN);
|
|
|
|
if (seq) {
|
|
/* Return the sequence number of the last transmitted frame. */
|
|
u16 iv16 = tkey->tx_iv16;
|
|
u32 iv32 = tkey->tx_iv32;
|
|
if (iv16 == 0)
|
|
iv32--;
|
|
iv16--;
|
|
seq[0] = tkey->tx_iv16;
|
|
seq[1] = tkey->tx_iv16 >> 8;
|
|
seq[2] = tkey->tx_iv32;
|
|
seq[3] = tkey->tx_iv32 >> 8;
|
|
seq[4] = tkey->tx_iv32 >> 16;
|
|
seq[5] = tkey->tx_iv32 >> 24;
|
|
}
|
|
|
|
return TKIP_KEY_LEN;
|
|
}
|
|
|
|
static char *ieee80211_tkip_print_stats(char *p, void *priv)
|
|
{
|
|
struct ieee80211_tkip_data *tkip = priv;
|
|
p += sprintf(p, "key[%d] alg=TKIP key_set=%d "
|
|
"tx_pn=%02x%02x%02x%02x%02x%02x "
|
|
"rx_pn=%02x%02x%02x%02x%02x%02x "
|
|
"replays=%d icv_errors=%d local_mic_failures=%d\n",
|
|
tkip->key_idx, tkip->key_set,
|
|
(tkip->tx_iv32 >> 24) & 0xff,
|
|
(tkip->tx_iv32 >> 16) & 0xff,
|
|
(tkip->tx_iv32 >> 8) & 0xff,
|
|
tkip->tx_iv32 & 0xff,
|
|
(tkip->tx_iv16 >> 8) & 0xff,
|
|
tkip->tx_iv16 & 0xff,
|
|
(tkip->rx_iv32 >> 24) & 0xff,
|
|
(tkip->rx_iv32 >> 16) & 0xff,
|
|
(tkip->rx_iv32 >> 8) & 0xff,
|
|
tkip->rx_iv32 & 0xff,
|
|
(tkip->rx_iv16 >> 8) & 0xff,
|
|
tkip->rx_iv16 & 0xff,
|
|
tkip->dot11RSNAStatsTKIPReplays,
|
|
tkip->dot11RSNAStatsTKIPICVErrors,
|
|
tkip->dot11RSNAStatsTKIPLocalMICFailures);
|
|
return p;
|
|
}
|
|
|
|
static struct ieee80211_crypto_ops ieee80211_crypt_tkip = {
|
|
.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,
|
|
.decrypt_msdu = ieee80211_michael_mic_verify,
|
|
.set_key = ieee80211_tkip_set_key,
|
|
.get_key = ieee80211_tkip_get_key,
|
|
.print_stats = ieee80211_tkip_print_stats,
|
|
.extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */
|
|
.extra_mpdu_postfix_len = 4, /* ICV */
|
|
.extra_msdu_postfix_len = 8, /* MIC */
|
|
.get_flags = ieee80211_tkip_get_flags,
|
|
.set_flags = ieee80211_tkip_set_flags,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init ieee80211_crypto_tkip_init(void)
|
|
{
|
|
return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip);
|
|
}
|
|
|
|
static void __exit ieee80211_crypto_tkip_exit(void)
|
|
{
|
|
ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip);
|
|
}
|
|
|
|
module_init(ieee80211_crypto_tkip_init);
|
|
module_exit(ieee80211_crypto_tkip_exit);
|