Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Host AP crypt: host-based TKIP encryption implementation for Host AP driver |
| 3 | * |
Jouni Malinen | 85d32e7 | 2007-03-24 17:15:30 -0700 | [diff] [blame] | 4 | * Copyright (c) 2003-2004, Jouni Malinen <j@w1.fi> |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. See README and COPYING for |
| 9 | * more details. |
| 10 | */ |
| 11 | |
Herbert Xu | f12cc20 | 2006-08-22 20:36:13 +1000 | [diff] [blame] | 12 | #include <linux/err.h> |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/random.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/netdevice.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 19 | #include <linux/mm.h> |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 20 | #include <linux/if_ether.h> |
| 21 | #include <linux/if_arp.h> |
| 22 | #include <asm/string.h> |
| 23 | |
| 24 | #include <net/ieee80211.h> |
| 25 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 26 | #include <linux/crypto.h> |
| 27 | #include <asm/scatterlist.h> |
| 28 | #include <linux/crc32.h> |
| 29 | |
| 30 | MODULE_AUTHOR("Jouni Malinen"); |
| 31 | MODULE_DESCRIPTION("Host AP crypt: TKIP"); |
| 32 | MODULE_LICENSE("GPL"); |
| 33 | |
| 34 | struct ieee80211_tkip_data { |
| 35 | #define TKIP_KEY_LEN 32 |
| 36 | u8 key[TKIP_KEY_LEN]; |
| 37 | int key_set; |
| 38 | |
| 39 | u32 tx_iv32; |
| 40 | u16 tx_iv16; |
| 41 | u16 tx_ttak[5]; |
| 42 | int tx_phase1_done; |
| 43 | |
| 44 | u32 rx_iv32; |
| 45 | u16 rx_iv16; |
| 46 | u16 rx_ttak[5]; |
| 47 | int rx_phase1_done; |
| 48 | u32 rx_iv32_new; |
| 49 | u16 rx_iv16_new; |
| 50 | |
| 51 | u32 dot11RSNAStatsTKIPReplays; |
| 52 | u32 dot11RSNAStatsTKIPICVErrors; |
| 53 | u32 dot11RSNAStatsTKIPLocalMICFailures; |
| 54 | |
| 55 | int key_idx; |
| 56 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 57 | struct crypto_blkcipher *rx_tfm_arc4; |
| 58 | struct crypto_hash *rx_tfm_michael; |
| 59 | struct crypto_blkcipher *tx_tfm_arc4; |
| 60 | struct crypto_hash *tx_tfm_michael; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 61 | |
| 62 | /* scratch buffers for virt_to_page() (crypto API) */ |
| 63 | u8 rx_hdr[16], tx_hdr[16]; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 64 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 65 | unsigned long flags; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 66 | }; |
| 67 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 68 | static unsigned long ieee80211_tkip_set_flags(unsigned long flags, void *priv) |
| 69 | { |
| 70 | struct ieee80211_tkip_data *_priv = priv; |
| 71 | unsigned long old_flags = _priv->flags; |
| 72 | _priv->flags = flags; |
| 73 | return old_flags; |
| 74 | } |
| 75 | |
| 76 | static unsigned long ieee80211_tkip_get_flags(void *priv) |
| 77 | { |
| 78 | struct ieee80211_tkip_data *_priv = priv; |
| 79 | return _priv->flags; |
| 80 | } |
| 81 | |
| 82 | static void *ieee80211_tkip_init(int key_idx) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 83 | { |
| 84 | struct ieee80211_tkip_data *priv; |
| 85 | |
Zhu Yi | 8aa914b | 2006-01-19 16:22:07 +0800 | [diff] [blame] | 86 | priv = kzalloc(sizeof(*priv), GFP_ATOMIC); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 87 | if (priv == NULL) |
| 88 | goto fail; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 89 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 90 | priv->key_idx = key_idx; |
| 91 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 92 | priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, |
Herbert Xu | f12cc20 | 2006-08-22 20:36:13 +1000 | [diff] [blame] | 93 | CRYPTO_ALG_ASYNC); |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 94 | if (IS_ERR(priv->tx_tfm_arc4)) { |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 95 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " |
| 96 | "crypto API arc4\n"); |
Jeff Garzik | 1837987 | 2006-09-22 21:19:05 -0400 | [diff] [blame] | 97 | priv->tx_tfm_arc4 = NULL; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 98 | goto fail; |
| 99 | } |
| 100 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 101 | priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0, |
| 102 | CRYPTO_ALG_ASYNC); |
| 103 | if (IS_ERR(priv->tx_tfm_michael)) { |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 104 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " |
| 105 | "crypto API michael_mic\n"); |
Jeff Garzik | 1837987 | 2006-09-22 21:19:05 -0400 | [diff] [blame] | 106 | priv->tx_tfm_michael = NULL; |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 107 | goto fail; |
| 108 | } |
| 109 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 110 | priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, |
| 111 | CRYPTO_ALG_ASYNC); |
| 112 | if (IS_ERR(priv->rx_tfm_arc4)) { |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 113 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " |
| 114 | "crypto API arc4\n"); |
Jeff Garzik | 1837987 | 2006-09-22 21:19:05 -0400 | [diff] [blame] | 115 | priv->rx_tfm_arc4 = NULL; |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 116 | goto fail; |
| 117 | } |
| 118 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 119 | priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0, |
| 120 | CRYPTO_ALG_ASYNC); |
| 121 | if (IS_ERR(priv->rx_tfm_michael)) { |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 122 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " |
| 123 | "crypto API michael_mic\n"); |
Jeff Garzik | 1837987 | 2006-09-22 21:19:05 -0400 | [diff] [blame] | 124 | priv->rx_tfm_michael = NULL; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 125 | goto fail; |
| 126 | } |
| 127 | |
| 128 | return priv; |
| 129 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 130 | fail: |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 131 | if (priv) { |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 132 | if (priv->tx_tfm_michael) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 133 | crypto_free_hash(priv->tx_tfm_michael); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 134 | if (priv->tx_tfm_arc4) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 135 | crypto_free_blkcipher(priv->tx_tfm_arc4); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 136 | if (priv->rx_tfm_michael) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 137 | crypto_free_hash(priv->rx_tfm_michael); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 138 | if (priv->rx_tfm_arc4) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 139 | crypto_free_blkcipher(priv->rx_tfm_arc4); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 140 | kfree(priv); |
| 141 | } |
| 142 | |
| 143 | return NULL; |
| 144 | } |
| 145 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 146 | static void ieee80211_tkip_deinit(void *priv) |
| 147 | { |
| 148 | struct ieee80211_tkip_data *_priv = priv; |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 149 | if (_priv) { |
| 150 | if (_priv->tx_tfm_michael) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 151 | crypto_free_hash(_priv->tx_tfm_michael); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 152 | if (_priv->tx_tfm_arc4) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 153 | crypto_free_blkcipher(_priv->tx_tfm_arc4); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 154 | if (_priv->rx_tfm_michael) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 155 | crypto_free_hash(_priv->rx_tfm_michael); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 156 | if (_priv->rx_tfm_arc4) |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 157 | crypto_free_blkcipher(_priv->rx_tfm_arc4); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 158 | } |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 159 | kfree(priv); |
| 160 | } |
| 161 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 162 | static inline u16 RotR1(u16 val) |
| 163 | { |
| 164 | return (val >> 1) | (val << 15); |
| 165 | } |
| 166 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 167 | static inline u8 Lo8(u16 val) |
| 168 | { |
| 169 | return val & 0xff; |
| 170 | } |
| 171 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 172 | static inline u8 Hi8(u16 val) |
| 173 | { |
| 174 | return val >> 8; |
| 175 | } |
| 176 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 177 | static inline u16 Lo16(u32 val) |
| 178 | { |
| 179 | return val & 0xffff; |
| 180 | } |
| 181 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 182 | static inline u16 Hi16(u32 val) |
| 183 | { |
| 184 | return val >> 16; |
| 185 | } |
| 186 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 187 | static inline u16 Mk16(u8 hi, u8 lo) |
| 188 | { |
| 189 | return lo | (((u16) hi) << 8); |
| 190 | } |
| 191 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 192 | static inline u16 Mk16_le(u16 * v) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 193 | { |
| 194 | return le16_to_cpu(*v); |
| 195 | } |
| 196 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 197 | static const u16 Sbox[256] = { |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 198 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, |
| 199 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, |
| 200 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, |
| 201 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, |
| 202 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, |
| 203 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, |
| 204 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, |
| 205 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, |
| 206 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, |
| 207 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, |
| 208 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, |
| 209 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, |
| 210 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, |
| 211 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, |
| 212 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, |
| 213 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, |
| 214 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, |
| 215 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, |
| 216 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, |
| 217 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, |
| 218 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, |
| 219 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, |
| 220 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, |
| 221 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, |
| 222 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, |
| 223 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, |
| 224 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, |
| 225 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, |
| 226 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, |
| 227 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, |
| 228 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, |
| 229 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, |
| 230 | }; |
| 231 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 232 | static inline u16 _S_(u16 v) |
| 233 | { |
| 234 | u16 t = Sbox[Hi8(v)]; |
| 235 | return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8)); |
| 236 | } |
| 237 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 238 | #define PHASE1_LOOP_COUNT 8 |
| 239 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 240 | static void tkip_mixing_phase1(u16 * TTAK, const u8 * TK, const u8 * TA, |
| 241 | u32 IV32) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 242 | { |
| 243 | int i, j; |
| 244 | |
| 245 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ |
| 246 | TTAK[0] = Lo16(IV32); |
| 247 | TTAK[1] = Hi16(IV32); |
| 248 | TTAK[2] = Mk16(TA[1], TA[0]); |
| 249 | TTAK[3] = Mk16(TA[3], TA[2]); |
| 250 | TTAK[4] = Mk16(TA[5], TA[4]); |
| 251 | |
| 252 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { |
| 253 | j = 2 * (i & 1); |
| 254 | TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); |
| 255 | TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); |
| 256 | TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); |
| 257 | TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); |
| 258 | TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; |
| 259 | } |
| 260 | } |
| 261 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 262 | static void tkip_mixing_phase2(u8 * WEPSeed, const u8 * TK, const u16 * TTAK, |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 263 | u16 IV16) |
| 264 | { |
| 265 | /* Make temporary area overlap WEP seed so that the final copy can be |
| 266 | * avoided on little endian hosts. */ |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 267 | u16 *PPK = (u16 *) & WEPSeed[4]; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 268 | |
| 269 | /* Step 1 - make copy of TTAK and bring in TSC */ |
| 270 | PPK[0] = TTAK[0]; |
| 271 | PPK[1] = TTAK[1]; |
| 272 | PPK[2] = TTAK[2]; |
| 273 | PPK[3] = TTAK[3]; |
| 274 | PPK[4] = TTAK[4]; |
| 275 | PPK[5] = TTAK[4] + IV16; |
| 276 | |
| 277 | /* Step 2 - 96-bit bijective mixing using S-box */ |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 278 | PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) & TK[0])); |
| 279 | PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) & TK[2])); |
| 280 | PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) & TK[4])); |
| 281 | PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) & TK[6])); |
| 282 | PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) & TK[8])); |
| 283 | PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) & TK[10])); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 284 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 285 | PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) & TK[12])); |
| 286 | PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) & TK[14])); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 287 | PPK[2] += RotR1(PPK[1]); |
| 288 | PPK[3] += RotR1(PPK[2]); |
| 289 | PPK[4] += RotR1(PPK[3]); |
| 290 | PPK[5] += RotR1(PPK[4]); |
| 291 | |
| 292 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value |
| 293 | * WEPSeed[0..2] is transmitted as WEP IV */ |
| 294 | WEPSeed[0] = Hi8(IV16); |
| 295 | WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; |
| 296 | WEPSeed[2] = Lo8(IV16); |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 297 | WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) & TK[0])) >> 1); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 298 | |
| 299 | #ifdef __BIG_ENDIAN |
| 300 | { |
| 301 | int i; |
| 302 | for (i = 0; i < 6; i++) |
| 303 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); |
| 304 | } |
| 305 | #endif |
| 306 | } |
| 307 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 308 | static int ieee80211_tkip_hdr(struct sk_buff *skb, int hdr_len, |
| 309 | u8 * rc4key, int keylen, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 310 | { |
| 311 | struct ieee80211_tkip_data *tkey = priv; |
| 312 | int len; |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 313 | u8 *pos; |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 314 | struct ieee80211_hdr_4addr *hdr; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 315 | |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 316 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 317 | |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 318 | if (skb_headroom(skb) < 8 || skb->len < hdr_len) |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 319 | return -1; |
| 320 | |
| 321 | if (rc4key == NULL || keylen < 16) |
| 322 | return -1; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 323 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 324 | if (!tkey->tx_phase1_done) { |
| 325 | tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2, |
| 326 | tkey->tx_iv32); |
| 327 | tkey->tx_phase1_done = 1; |
| 328 | } |
| 329 | tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16); |
| 330 | |
| 331 | len = skb->len - hdr_len; |
| 332 | pos = skb_push(skb, 8); |
| 333 | memmove(pos, pos + 8, hdr_len); |
| 334 | pos += hdr_len; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 335 | |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 336 | *pos++ = *rc4key; |
| 337 | *pos++ = *(rc4key + 1); |
| 338 | *pos++ = *(rc4key + 2); |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 339 | *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */ ; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 340 | *pos++ = tkey->tx_iv32 & 0xff; |
| 341 | *pos++ = (tkey->tx_iv32 >> 8) & 0xff; |
| 342 | *pos++ = (tkey->tx_iv32 >> 16) & 0xff; |
| 343 | *pos++ = (tkey->tx_iv32 >> 24) & 0xff; |
| 344 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 345 | tkey->tx_iv16++; |
| 346 | if (tkey->tx_iv16 == 0) { |
| 347 | tkey->tx_phase1_done = 0; |
| 348 | tkey->tx_iv32++; |
| 349 | } |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 350 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 351 | return 8; |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) |
| 355 | { |
| 356 | struct ieee80211_tkip_data *tkey = priv; |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 357 | struct blkcipher_desc desc = { .tfm = tkey->tx_tfm_arc4 }; |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 358 | int len; |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 359 | u8 rc4key[16], *pos, *icv; |
| 360 | u32 crc; |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 361 | struct scatterlist sg; |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 362 | DECLARE_MAC_BUF(mac); |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 363 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 364 | if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) { |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 365 | if (net_ratelimit()) { |
| 366 | struct ieee80211_hdr_4addr *hdr = |
| 367 | (struct ieee80211_hdr_4addr *)skb->data; |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 368 | printk(KERN_DEBUG ": TKIP countermeasures: dropped " |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 369 | "TX packet to %s\n", |
| 370 | print_mac(mac, hdr->addr1)); |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 371 | } |
| 372 | return -1; |
| 373 | } |
| 374 | |
| 375 | if (skb_tailroom(skb) < 4 || skb->len < hdr_len) |
| 376 | return -1; |
| 377 | |
| 378 | len = skb->len - hdr_len; |
| 379 | pos = skb->data + hdr_len; |
| 380 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 381 | if ((ieee80211_tkip_hdr(skb, hdr_len, rc4key, 16, priv)) < 0) |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 382 | return -1; |
| 383 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 384 | icv = skb_put(skb, 4); |
| 385 | |
| 386 | crc = ~crc32_le(~0, pos, len); |
| 387 | icv[0] = crc; |
| 388 | icv[1] = crc >> 8; |
| 389 | icv[2] = crc >> 16; |
| 390 | icv[3] = crc >> 24; |
| 391 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 392 | crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 393 | sg.page = virt_to_page(pos); |
| 394 | sg.offset = offset_in_page(pos); |
| 395 | sg.length = len + 4; |
Herbert Xu | f12cc20 | 2006-08-22 20:36:13 +1000 | [diff] [blame] | 396 | return crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4); |
Zhu Yi | b4328d8 | 2006-08-21 11:33:09 +0800 | [diff] [blame] | 397 | } |
| 398 | |
Jeff Garzik | 1837987 | 2006-09-22 21:19:05 -0400 | [diff] [blame] | 399 | /* |
| 400 | * deal with seq counter wrapping correctly. |
| 401 | * refer to timer_after() for jiffies wrapping handling |
| 402 | */ |
| 403 | static inline int tkip_replay_check(u32 iv32_n, u16 iv16_n, |
| 404 | u32 iv32_o, u16 iv16_o) |
| 405 | { |
| 406 | if ((s32)iv32_n - (s32)iv32_o < 0 || |
| 407 | (iv32_n == iv32_o && iv16_n <= iv16_o)) |
| 408 | return 1; |
| 409 | return 0; |
| 410 | } |
| 411 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 412 | static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
| 413 | { |
| 414 | struct ieee80211_tkip_data *tkey = priv; |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 415 | struct blkcipher_desc desc = { .tfm = tkey->rx_tfm_arc4 }; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 416 | u8 rc4key[16]; |
| 417 | u8 keyidx, *pos; |
| 418 | u32 iv32; |
| 419 | u16 iv16; |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 420 | struct ieee80211_hdr_4addr *hdr; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 421 | u8 icv[4]; |
| 422 | u32 crc; |
| 423 | struct scatterlist sg; |
| 424 | int plen; |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 425 | DECLARE_MAC_BUF(mac); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 426 | |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 427 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 428 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 429 | if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) { |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 430 | if (net_ratelimit()) { |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 431 | printk(KERN_DEBUG ": TKIP countermeasures: dropped " |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 432 | "received packet from %s\n", |
| 433 | print_mac(mac, hdr->addr2)); |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 434 | } |
| 435 | return -1; |
| 436 | } |
| 437 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 438 | if (skb->len < hdr_len + 8 + 4) |
| 439 | return -1; |
| 440 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 441 | pos = skb->data + hdr_len; |
| 442 | keyidx = pos[3]; |
| 443 | if (!(keyidx & (1 << 5))) { |
| 444 | if (net_ratelimit()) { |
| 445 | printk(KERN_DEBUG "TKIP: received packet without ExtIV" |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 446 | " flag from %s\n", print_mac(mac, hdr->addr2)); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 447 | } |
| 448 | return -2; |
| 449 | } |
| 450 | keyidx >>= 6; |
| 451 | if (tkey->key_idx != keyidx) { |
| 452 | printk(KERN_DEBUG "TKIP: RX tkey->key_idx=%d frame " |
| 453 | "keyidx=%d priv=%p\n", tkey->key_idx, keyidx, priv); |
| 454 | return -6; |
| 455 | } |
| 456 | if (!tkey->key_set) { |
| 457 | if (net_ratelimit()) { |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 458 | printk(KERN_DEBUG "TKIP: received packet from %s" |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 459 | " with keyid=%d that does not have a configured" |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 460 | " key\n", print_mac(mac, hdr->addr2), keyidx); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 461 | } |
| 462 | return -3; |
| 463 | } |
| 464 | iv16 = (pos[0] << 8) | pos[2]; |
| 465 | iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24); |
| 466 | pos += 8; |
| 467 | |
Zhu Yi | b4328d8 | 2006-08-21 11:33:09 +0800 | [diff] [blame] | 468 | if (tkip_replay_check(iv32, iv16, tkey->rx_iv32, tkey->rx_iv16)) { |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 469 | if (net_ratelimit()) { |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 470 | IEEE80211_DEBUG_DROP("TKIP: replay detected: STA=%s" |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 471 | " previous TSC %08x%04x received TSC " |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 472 | "%08x%04x\n", print_mac(mac, hdr->addr2), |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 473 | tkey->rx_iv32, tkey->rx_iv16, iv32, iv16); |
| 474 | } |
| 475 | tkey->dot11RSNAStatsTKIPReplays++; |
| 476 | return -4; |
| 477 | } |
| 478 | |
| 479 | if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) { |
| 480 | tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32); |
| 481 | tkey->rx_phase1_done = 1; |
| 482 | } |
| 483 | tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16); |
| 484 | |
| 485 | plen = skb->len - hdr_len - 12; |
| 486 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 487 | crypto_blkcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 488 | sg.page = virt_to_page(pos); |
| 489 | sg.offset = offset_in_page(pos); |
| 490 | sg.length = plen + 4; |
Herbert Xu | f12cc20 | 2006-08-22 20:36:13 +1000 | [diff] [blame] | 491 | if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) { |
| 492 | if (net_ratelimit()) { |
| 493 | printk(KERN_DEBUG ": TKIP: failed to decrypt " |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 494 | "received packet from %s\n", |
| 495 | print_mac(mac, hdr->addr2)); |
Herbert Xu | f12cc20 | 2006-08-22 20:36:13 +1000 | [diff] [blame] | 496 | } |
| 497 | return -7; |
| 498 | } |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 499 | |
| 500 | crc = ~crc32_le(~0, pos, plen); |
| 501 | icv[0] = crc; |
| 502 | icv[1] = crc >> 8; |
| 503 | icv[2] = crc >> 16; |
| 504 | icv[3] = crc >> 24; |
| 505 | if (memcmp(icv, pos + plen, 4) != 0) { |
| 506 | if (iv32 != tkey->rx_iv32) { |
| 507 | /* Previously cached Phase1 result was already lost, so |
| 508 | * it needs to be recalculated for the next packet. */ |
| 509 | tkey->rx_phase1_done = 0; |
| 510 | } |
| 511 | if (net_ratelimit()) { |
Larry Finger | aeb998c | 2007-04-09 11:24:41 -0500 | [diff] [blame] | 512 | IEEE80211_DEBUG_DROP("TKIP: ICV error detected: STA=" |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 513 | "%s\n", print_mac(mac, hdr->addr2)); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 514 | } |
| 515 | tkey->dot11RSNAStatsTKIPICVErrors++; |
| 516 | return -5; |
| 517 | } |
| 518 | |
| 519 | /* Update real counters only after Michael MIC verification has |
| 520 | * completed */ |
| 521 | tkey->rx_iv32_new = iv32; |
| 522 | tkey->rx_iv16_new = iv16; |
| 523 | |
| 524 | /* Remove IV and ICV */ |
| 525 | memmove(skb->data + 8, skb->data, hdr_len); |
| 526 | skb_pull(skb, 8); |
| 527 | skb_trim(skb, skb->len - 4); |
| 528 | |
| 529 | return keyidx; |
| 530 | } |
| 531 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 532 | static int michael_mic(struct crypto_hash *tfm_michael, u8 * key, u8 * hdr, |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 533 | u8 * data, size_t data_len, u8 * mic) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 534 | { |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 535 | struct hash_desc desc; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 536 | struct scatterlist sg[2]; |
| 537 | |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 538 | if (tfm_michael == NULL) { |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 539 | printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n"); |
| 540 | return -1; |
| 541 | } |
| 542 | sg[0].page = virt_to_page(hdr); |
| 543 | sg[0].offset = offset_in_page(hdr); |
| 544 | sg[0].length = 16; |
| 545 | |
| 546 | sg[1].page = virt_to_page(data); |
| 547 | sg[1].offset = offset_in_page(data); |
| 548 | sg[1].length = data_len; |
| 549 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 550 | if (crypto_hash_setkey(tfm_michael, key, 8)) |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 551 | return -1; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 552 | |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 553 | desc.tfm = tfm_michael; |
Herbert Xu | 3505868 | 2006-08-24 19:10:20 +1000 | [diff] [blame] | 554 | desc.flags = 0; |
| 555 | return crypto_hash_digest(&desc, sg, data_len + 16, mic); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 556 | } |
| 557 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 558 | static void michael_mic_hdr(struct sk_buff *skb, u8 * hdr) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 559 | { |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 560 | struct ieee80211_hdr_4addr *hdr11; |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 561 | u16 stype; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 562 | |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 563 | hdr11 = (struct ieee80211_hdr_4addr *)skb->data; |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 564 | stype = WLAN_FC_GET_STYPE(le16_to_cpu(hdr11->frame_ctl)); |
| 565 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 566 | switch (le16_to_cpu(hdr11->frame_ctl) & |
| 567 | (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
| 568 | case IEEE80211_FCTL_TODS: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 569 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ |
| 570 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 571 | break; |
| 572 | case IEEE80211_FCTL_FROMDS: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 573 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ |
| 574 | memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 575 | break; |
| 576 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 577 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ |
| 578 | memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 579 | break; |
| 580 | case 0: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 581 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ |
| 582 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 583 | break; |
| 584 | } |
| 585 | |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 586 | if (stype & IEEE80211_STYPE_QOS_DATA) { |
| 587 | const struct ieee80211_hdr_3addrqos *qoshdr = |
| 588 | (struct ieee80211_hdr_3addrqos *)skb->data; |
Johannes Berg | e797aa1 | 2007-10-15 16:50:54 +0200 | [diff] [blame^] | 589 | hdr[12] = le16_to_cpu(qoshdr->qos_ctl) & IEEE80211_QCTL_TID; |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 590 | } else |
| 591 | hdr[12] = 0; /* priority */ |
| 592 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 593 | hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 594 | } |
| 595 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 596 | static int ieee80211_michael_mic_add(struct sk_buff *skb, int hdr_len, |
| 597 | void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 598 | { |
| 599 | struct ieee80211_tkip_data *tkey = priv; |
| 600 | u8 *pos; |
| 601 | |
| 602 | if (skb_tailroom(skb) < 8 || skb->len < hdr_len) { |
| 603 | printk(KERN_DEBUG "Invalid packet for Michael MIC add " |
| 604 | "(tailroom=%d hdr_len=%d skb->len=%d)\n", |
| 605 | skb_tailroom(skb), hdr_len, skb->len); |
| 606 | return -1; |
| 607 | } |
| 608 | |
| 609 | michael_mic_hdr(skb, tkey->tx_hdr); |
| 610 | pos = skb_put(skb, 8); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 611 | if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr, |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 612 | skb->data + hdr_len, skb->len - 8 - hdr_len, pos)) |
| 613 | return -1; |
| 614 | |
| 615 | return 0; |
| 616 | } |
| 617 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 618 | static void ieee80211_michael_mic_failure(struct net_device *dev, |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 619 | struct ieee80211_hdr_4addr *hdr, |
| 620 | int keyidx) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 621 | { |
| 622 | union iwreq_data wrqu; |
| 623 | struct iw_michaelmicfailure ev; |
| 624 | |
| 625 | /* TODO: needed parameters: count, keyid, key type, TSC */ |
| 626 | memset(&ev, 0, sizeof(ev)); |
| 627 | ev.flags = keyidx & IW_MICFAILURE_KEY_ID; |
| 628 | if (hdr->addr1[0] & 0x01) |
| 629 | ev.flags |= IW_MICFAILURE_GROUP; |
| 630 | else |
| 631 | ev.flags |= IW_MICFAILURE_PAIRWISE; |
| 632 | ev.src_addr.sa_family = ARPHRD_ETHER; |
| 633 | memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN); |
| 634 | memset(&wrqu, 0, sizeof(wrqu)); |
| 635 | wrqu.data.length = sizeof(ev); |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 636 | wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *)&ev); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 637 | } |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 638 | |
| 639 | static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx, |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 640 | int hdr_len, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 641 | { |
| 642 | struct ieee80211_tkip_data *tkey = priv; |
| 643 | u8 mic[8]; |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 644 | DECLARE_MAC_BUF(mac); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 645 | |
| 646 | if (!tkey->key_set) |
| 647 | return -1; |
| 648 | |
| 649 | michael_mic_hdr(skb, tkey->rx_hdr); |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 650 | if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr, |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 651 | skb->data + hdr_len, skb->len - 8 - hdr_len, mic)) |
| 652 | return -1; |
| 653 | if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) { |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 654 | struct ieee80211_hdr_4addr *hdr; |
| 655 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 656 | printk(KERN_DEBUG "%s: Michael MIC verification failed for " |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 657 | "MSDU from %s keyidx=%d\n", |
| 658 | skb->dev ? skb->dev->name : "N/A", print_mac(mac, hdr->addr2), |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 659 | keyidx); |
| 660 | if (skb->dev) |
| 661 | ieee80211_michael_mic_failure(skb->dev, hdr, keyidx); |
| 662 | tkey->dot11RSNAStatsTKIPLocalMICFailures++; |
| 663 | return -1; |
| 664 | } |
| 665 | |
| 666 | /* Update TSC counters for RX now that the packet verification has |
| 667 | * completed. */ |
| 668 | tkey->rx_iv32 = tkey->rx_iv32_new; |
| 669 | tkey->rx_iv16 = tkey->rx_iv16_new; |
| 670 | |
| 671 | skb_trim(skb, skb->len - 8); |
| 672 | |
| 673 | return 0; |
| 674 | } |
| 675 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 676 | static int ieee80211_tkip_set_key(void *key, int len, u8 * seq, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 677 | { |
| 678 | struct ieee80211_tkip_data *tkey = priv; |
| 679 | int keyidx; |
Jeff Garzik | 28eb177 | 2006-09-22 20:10:23 -0400 | [diff] [blame] | 680 | struct crypto_hash *tfm = tkey->tx_tfm_michael; |
| 681 | struct crypto_blkcipher *tfm2 = tkey->tx_tfm_arc4; |
| 682 | struct crypto_hash *tfm3 = tkey->rx_tfm_michael; |
| 683 | struct crypto_blkcipher *tfm4 = tkey->rx_tfm_arc4; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 684 | |
| 685 | keyidx = tkey->key_idx; |
| 686 | memset(tkey, 0, sizeof(*tkey)); |
| 687 | tkey->key_idx = keyidx; |
Zhu Yi | 5a65694 | 2006-08-21 11:33:56 +0800 | [diff] [blame] | 688 | tkey->tx_tfm_michael = tfm; |
| 689 | tkey->tx_tfm_arc4 = tfm2; |
| 690 | tkey->rx_tfm_michael = tfm3; |
| 691 | tkey->rx_tfm_arc4 = tfm4; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 692 | if (len == TKIP_KEY_LEN) { |
| 693 | memcpy(tkey->key, key, TKIP_KEY_LEN); |
| 694 | tkey->key_set = 1; |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 695 | tkey->tx_iv16 = 1; /* TSC is initialized to 1 */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 696 | if (seq) { |
| 697 | tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 698 | (seq[3] << 8) | seq[2]; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 699 | tkey->rx_iv16 = (seq[1] << 8) | seq[0]; |
| 700 | } |
| 701 | } else if (len == 0) |
| 702 | tkey->key_set = 0; |
| 703 | else |
| 704 | return -1; |
| 705 | |
| 706 | return 0; |
| 707 | } |
| 708 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 709 | static int ieee80211_tkip_get_key(void *key, int len, u8 * seq, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 710 | { |
| 711 | struct ieee80211_tkip_data *tkey = priv; |
| 712 | |
| 713 | if (len < TKIP_KEY_LEN) |
| 714 | return -1; |
| 715 | |
| 716 | if (!tkey->key_set) |
| 717 | return 0; |
| 718 | memcpy(key, tkey->key, TKIP_KEY_LEN); |
| 719 | |
| 720 | if (seq) { |
| 721 | /* Return the sequence number of the last transmitted frame. */ |
| 722 | u16 iv16 = tkey->tx_iv16; |
| 723 | u32 iv32 = tkey->tx_iv32; |
| 724 | if (iv16 == 0) |
| 725 | iv32--; |
| 726 | iv16--; |
| 727 | seq[0] = tkey->tx_iv16; |
| 728 | seq[1] = tkey->tx_iv16 >> 8; |
| 729 | seq[2] = tkey->tx_iv32; |
| 730 | seq[3] = tkey->tx_iv32 >> 8; |
| 731 | seq[4] = tkey->tx_iv32 >> 16; |
| 732 | seq[5] = tkey->tx_iv32 >> 24; |
| 733 | } |
| 734 | |
| 735 | return TKIP_KEY_LEN; |
| 736 | } |
| 737 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 738 | static char *ieee80211_tkip_print_stats(char *p, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 739 | { |
| 740 | struct ieee80211_tkip_data *tkip = priv; |
| 741 | p += sprintf(p, "key[%d] alg=TKIP key_set=%d " |
| 742 | "tx_pn=%02x%02x%02x%02x%02x%02x " |
| 743 | "rx_pn=%02x%02x%02x%02x%02x%02x " |
| 744 | "replays=%d icv_errors=%d local_mic_failures=%d\n", |
| 745 | tkip->key_idx, tkip->key_set, |
| 746 | (tkip->tx_iv32 >> 24) & 0xff, |
| 747 | (tkip->tx_iv32 >> 16) & 0xff, |
| 748 | (tkip->tx_iv32 >> 8) & 0xff, |
| 749 | tkip->tx_iv32 & 0xff, |
| 750 | (tkip->tx_iv16 >> 8) & 0xff, |
| 751 | tkip->tx_iv16 & 0xff, |
| 752 | (tkip->rx_iv32 >> 24) & 0xff, |
| 753 | (tkip->rx_iv32 >> 16) & 0xff, |
| 754 | (tkip->rx_iv32 >> 8) & 0xff, |
| 755 | tkip->rx_iv32 & 0xff, |
| 756 | (tkip->rx_iv16 >> 8) & 0xff, |
| 757 | tkip->rx_iv16 & 0xff, |
| 758 | tkip->dot11RSNAStatsTKIPReplays, |
| 759 | tkip->dot11RSNAStatsTKIPICVErrors, |
| 760 | tkip->dot11RSNAStatsTKIPLocalMICFailures); |
| 761 | return p; |
| 762 | } |
| 763 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 764 | static struct ieee80211_crypto_ops ieee80211_crypt_tkip = { |
James Ketrenos | 74079fd | 2005-09-13 17:35:21 -0500 | [diff] [blame] | 765 | .name = "TKIP", |
| 766 | .init = ieee80211_tkip_init, |
| 767 | .deinit = ieee80211_tkip_deinit, |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 768 | .build_iv = ieee80211_tkip_hdr, |
James Ketrenos | 74079fd | 2005-09-13 17:35:21 -0500 | [diff] [blame] | 769 | .encrypt_mpdu = ieee80211_tkip_encrypt, |
| 770 | .decrypt_mpdu = ieee80211_tkip_decrypt, |
| 771 | .encrypt_msdu = ieee80211_michael_mic_add, |
| 772 | .decrypt_msdu = ieee80211_michael_mic_verify, |
| 773 | .set_key = ieee80211_tkip_set_key, |
| 774 | .get_key = ieee80211_tkip_get_key, |
| 775 | .print_stats = ieee80211_tkip_print_stats, |
James Ketrenos | 1264fc0 | 2005-09-21 11:54:53 -0500 | [diff] [blame] | 776 | .extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */ |
| 777 | .extra_mpdu_postfix_len = 4, /* ICV */ |
| 778 | .extra_msdu_postfix_len = 8, /* MIC */ |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 779 | .get_flags = ieee80211_tkip_get_flags, |
| 780 | .set_flags = ieee80211_tkip_set_flags, |
James Ketrenos | 74079fd | 2005-09-13 17:35:21 -0500 | [diff] [blame] | 781 | .owner = THIS_MODULE, |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 782 | }; |
| 783 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 784 | static int __init ieee80211_crypto_tkip_init(void) |
| 785 | { |
| 786 | return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip); |
| 787 | } |
| 788 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 789 | static void __exit ieee80211_crypto_tkip_exit(void) |
| 790 | { |
| 791 | ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip); |
| 792 | } |
| 793 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 794 | module_init(ieee80211_crypto_tkip_init); |
| 795 | module_exit(ieee80211_crypto_tkip_exit); |