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 | * |
| 4 | * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi> |
| 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 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/random.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/if_ether.h> |
| 19 | #include <linux/if_arp.h> |
| 20 | #include <asm/string.h> |
| 21 | |
| 22 | #include <net/ieee80211.h> |
| 23 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 24 | #include <linux/crypto.h> |
| 25 | #include <asm/scatterlist.h> |
| 26 | #include <linux/crc32.h> |
| 27 | |
| 28 | MODULE_AUTHOR("Jouni Malinen"); |
| 29 | MODULE_DESCRIPTION("Host AP crypt: TKIP"); |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | |
| 32 | struct ieee80211_tkip_data { |
| 33 | #define TKIP_KEY_LEN 32 |
| 34 | u8 key[TKIP_KEY_LEN]; |
| 35 | int key_set; |
| 36 | |
| 37 | u32 tx_iv32; |
| 38 | u16 tx_iv16; |
| 39 | u16 tx_ttak[5]; |
| 40 | int tx_phase1_done; |
| 41 | |
| 42 | u32 rx_iv32; |
| 43 | u16 rx_iv16; |
| 44 | u16 rx_ttak[5]; |
| 45 | int rx_phase1_done; |
| 46 | u32 rx_iv32_new; |
| 47 | u16 rx_iv16_new; |
| 48 | |
| 49 | u32 dot11RSNAStatsTKIPReplays; |
| 50 | u32 dot11RSNAStatsTKIPICVErrors; |
| 51 | u32 dot11RSNAStatsTKIPLocalMICFailures; |
| 52 | |
| 53 | int key_idx; |
| 54 | |
| 55 | struct crypto_tfm *tfm_arc4; |
| 56 | struct crypto_tfm *tfm_michael; |
| 57 | |
| 58 | /* scratch buffers for virt_to_page() (crypto API) */ |
| 59 | u8 rx_hdr[16], tx_hdr[16]; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 60 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 61 | unsigned long flags; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 62 | }; |
| 63 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 64 | static unsigned long ieee80211_tkip_set_flags(unsigned long flags, void *priv) |
| 65 | { |
| 66 | struct ieee80211_tkip_data *_priv = priv; |
| 67 | unsigned long old_flags = _priv->flags; |
| 68 | _priv->flags = flags; |
| 69 | return old_flags; |
| 70 | } |
| 71 | |
| 72 | static unsigned long ieee80211_tkip_get_flags(void *priv) |
| 73 | { |
| 74 | struct ieee80211_tkip_data *_priv = priv; |
| 75 | return _priv->flags; |
| 76 | } |
| 77 | |
| 78 | static void *ieee80211_tkip_init(int key_idx) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 79 | { |
| 80 | struct ieee80211_tkip_data *priv; |
| 81 | |
Zhu Yi | 8aa914b | 2006-01-19 16:22:07 +0800 | [diff] [blame] | 82 | priv = kzalloc(sizeof(*priv), GFP_ATOMIC); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 83 | if (priv == NULL) |
| 84 | goto fail; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 85 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 86 | priv->key_idx = key_idx; |
| 87 | |
| 88 | priv->tfm_arc4 = crypto_alloc_tfm("arc4", 0); |
| 89 | if (priv->tfm_arc4 == NULL) { |
| 90 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " |
| 91 | "crypto API arc4\n"); |
| 92 | goto fail; |
| 93 | } |
| 94 | |
| 95 | priv->tfm_michael = crypto_alloc_tfm("michael_mic", 0); |
| 96 | if (priv->tfm_michael == NULL) { |
| 97 | printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate " |
| 98 | "crypto API michael_mic\n"); |
| 99 | goto fail; |
| 100 | } |
| 101 | |
| 102 | return priv; |
| 103 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 104 | fail: |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 105 | if (priv) { |
| 106 | if (priv->tfm_michael) |
| 107 | crypto_free_tfm(priv->tfm_michael); |
| 108 | if (priv->tfm_arc4) |
| 109 | crypto_free_tfm(priv->tfm_arc4); |
| 110 | kfree(priv); |
| 111 | } |
| 112 | |
| 113 | return NULL; |
| 114 | } |
| 115 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 116 | static void ieee80211_tkip_deinit(void *priv) |
| 117 | { |
| 118 | struct ieee80211_tkip_data *_priv = priv; |
| 119 | if (_priv && _priv->tfm_michael) |
| 120 | crypto_free_tfm(_priv->tfm_michael); |
| 121 | if (_priv && _priv->tfm_arc4) |
| 122 | crypto_free_tfm(_priv->tfm_arc4); |
| 123 | kfree(priv); |
| 124 | } |
| 125 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 126 | static inline u16 RotR1(u16 val) |
| 127 | { |
| 128 | return (val >> 1) | (val << 15); |
| 129 | } |
| 130 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 131 | static inline u8 Lo8(u16 val) |
| 132 | { |
| 133 | return val & 0xff; |
| 134 | } |
| 135 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 136 | static inline u8 Hi8(u16 val) |
| 137 | { |
| 138 | return val >> 8; |
| 139 | } |
| 140 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 141 | static inline u16 Lo16(u32 val) |
| 142 | { |
| 143 | return val & 0xffff; |
| 144 | } |
| 145 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 146 | static inline u16 Hi16(u32 val) |
| 147 | { |
| 148 | return val >> 16; |
| 149 | } |
| 150 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 151 | static inline u16 Mk16(u8 hi, u8 lo) |
| 152 | { |
| 153 | return lo | (((u16) hi) << 8); |
| 154 | } |
| 155 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 156 | static inline u16 Mk16_le(u16 * v) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 157 | { |
| 158 | return le16_to_cpu(*v); |
| 159 | } |
| 160 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 161 | static const u16 Sbox[256] = { |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 162 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, |
| 163 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, |
| 164 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, |
| 165 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, |
| 166 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, |
| 167 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, |
| 168 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, |
| 169 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, |
| 170 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, |
| 171 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, |
| 172 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, |
| 173 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, |
| 174 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, |
| 175 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, |
| 176 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, |
| 177 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, |
| 178 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, |
| 179 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, |
| 180 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, |
| 181 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, |
| 182 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, |
| 183 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, |
| 184 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, |
| 185 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, |
| 186 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, |
| 187 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, |
| 188 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, |
| 189 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, |
| 190 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, |
| 191 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, |
| 192 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, |
| 193 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, |
| 194 | }; |
| 195 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 196 | static inline u16 _S_(u16 v) |
| 197 | { |
| 198 | u16 t = Sbox[Hi8(v)]; |
| 199 | return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8)); |
| 200 | } |
| 201 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 202 | #define PHASE1_LOOP_COUNT 8 |
| 203 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 204 | static void tkip_mixing_phase1(u16 * TTAK, const u8 * TK, const u8 * TA, |
| 205 | u32 IV32) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 206 | { |
| 207 | int i, j; |
| 208 | |
| 209 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ |
| 210 | TTAK[0] = Lo16(IV32); |
| 211 | TTAK[1] = Hi16(IV32); |
| 212 | TTAK[2] = Mk16(TA[1], TA[0]); |
| 213 | TTAK[3] = Mk16(TA[3], TA[2]); |
| 214 | TTAK[4] = Mk16(TA[5], TA[4]); |
| 215 | |
| 216 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { |
| 217 | j = 2 * (i & 1); |
| 218 | TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); |
| 219 | TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); |
| 220 | TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); |
| 221 | TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); |
| 222 | TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; |
| 223 | } |
| 224 | } |
| 225 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 226 | 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] | 227 | u16 IV16) |
| 228 | { |
| 229 | /* Make temporary area overlap WEP seed so that the final copy can be |
| 230 | * avoided on little endian hosts. */ |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 231 | u16 *PPK = (u16 *) & WEPSeed[4]; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 232 | |
| 233 | /* Step 1 - make copy of TTAK and bring in TSC */ |
| 234 | PPK[0] = TTAK[0]; |
| 235 | PPK[1] = TTAK[1]; |
| 236 | PPK[2] = TTAK[2]; |
| 237 | PPK[3] = TTAK[3]; |
| 238 | PPK[4] = TTAK[4]; |
| 239 | PPK[5] = TTAK[4] + IV16; |
| 240 | |
| 241 | /* Step 2 - 96-bit bijective mixing using S-box */ |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 242 | PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) & TK[0])); |
| 243 | PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) & TK[2])); |
| 244 | PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) & TK[4])); |
| 245 | PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) & TK[6])); |
| 246 | PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) & TK[8])); |
| 247 | PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) & TK[10])); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 248 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 249 | PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) & TK[12])); |
| 250 | PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) & TK[14])); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 251 | PPK[2] += RotR1(PPK[1]); |
| 252 | PPK[3] += RotR1(PPK[2]); |
| 253 | PPK[4] += RotR1(PPK[3]); |
| 254 | PPK[5] += RotR1(PPK[4]); |
| 255 | |
| 256 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value |
| 257 | * WEPSeed[0..2] is transmitted as WEP IV */ |
| 258 | WEPSeed[0] = Hi8(IV16); |
| 259 | WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; |
| 260 | WEPSeed[2] = Lo8(IV16); |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 261 | WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) & TK[0])) >> 1); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 262 | |
| 263 | #ifdef __BIG_ENDIAN |
| 264 | { |
| 265 | int i; |
| 266 | for (i = 0; i < 6; i++) |
| 267 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); |
| 268 | } |
| 269 | #endif |
| 270 | } |
| 271 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 272 | static int ieee80211_tkip_hdr(struct sk_buff *skb, int hdr_len, |
| 273 | u8 * rc4key, int keylen, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 274 | { |
| 275 | struct ieee80211_tkip_data *tkey = priv; |
| 276 | int len; |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 277 | u8 *pos; |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 278 | struct ieee80211_hdr_4addr *hdr; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 279 | |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 280 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 281 | |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 282 | if (skb_headroom(skb) < 8 || skb->len < hdr_len) |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 283 | return -1; |
| 284 | |
| 285 | if (rc4key == NULL || keylen < 16) |
| 286 | return -1; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 287 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 288 | if (!tkey->tx_phase1_done) { |
| 289 | tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2, |
| 290 | tkey->tx_iv32); |
| 291 | tkey->tx_phase1_done = 1; |
| 292 | } |
| 293 | tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16); |
| 294 | |
| 295 | len = skb->len - hdr_len; |
| 296 | pos = skb_push(skb, 8); |
| 297 | memmove(pos, pos + 8, hdr_len); |
| 298 | pos += hdr_len; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 299 | |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 300 | *pos++ = *rc4key; |
| 301 | *pos++ = *(rc4key + 1); |
| 302 | *pos++ = *(rc4key + 2); |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 303 | *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */ ; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 304 | *pos++ = tkey->tx_iv32 & 0xff; |
| 305 | *pos++ = (tkey->tx_iv32 >> 8) & 0xff; |
| 306 | *pos++ = (tkey->tx_iv32 >> 16) & 0xff; |
| 307 | *pos++ = (tkey->tx_iv32 >> 24) & 0xff; |
| 308 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 309 | tkey->tx_iv16++; |
| 310 | if (tkey->tx_iv16 == 0) { |
| 311 | tkey->tx_phase1_done = 0; |
| 312 | tkey->tx_iv32++; |
| 313 | } |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 314 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 315 | return 8; |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) |
| 319 | { |
| 320 | struct ieee80211_tkip_data *tkey = priv; |
| 321 | int len; |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 322 | u8 rc4key[16], *pos, *icv; |
| 323 | u32 crc; |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 324 | struct scatterlist sg; |
| 325 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 326 | if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) { |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 327 | if (net_ratelimit()) { |
| 328 | struct ieee80211_hdr_4addr *hdr = |
| 329 | (struct ieee80211_hdr_4addr *)skb->data; |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 330 | printk(KERN_DEBUG ": TKIP countermeasures: dropped " |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 331 | "TX packet to " MAC_FMT "\n", |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 332 | MAC_ARG(hdr->addr1)); |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 333 | } |
| 334 | return -1; |
| 335 | } |
| 336 | |
| 337 | if (skb_tailroom(skb) < 4 || skb->len < hdr_len) |
| 338 | return -1; |
| 339 | |
| 340 | len = skb->len - hdr_len; |
| 341 | pos = skb->data + hdr_len; |
| 342 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 343 | if ((ieee80211_tkip_hdr(skb, hdr_len, rc4key, 16, priv)) < 0) |
James Ketrenos | 31b59ea | 2005-09-21 11:58:49 -0500 | [diff] [blame] | 344 | return -1; |
| 345 | |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 346 | icv = skb_put(skb, 4); |
| 347 | |
| 348 | crc = ~crc32_le(~0, pos, len); |
| 349 | icv[0] = crc; |
| 350 | icv[1] = crc >> 8; |
| 351 | icv[2] = crc >> 16; |
| 352 | icv[3] = crc >> 24; |
| 353 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 354 | crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16); |
| 355 | sg.page = virt_to_page(pos); |
| 356 | sg.offset = offset_in_page(pos); |
| 357 | sg.length = len + 4; |
| 358 | crypto_cipher_encrypt(tkey->tfm_arc4, &sg, &sg, len + 4); |
| 359 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 360 | return 0; |
| 361 | } |
| 362 | |
Zhu Yi | b4328d8 | 2006-08-21 11:33:09 +0800 | [diff] [blame^] | 363 | /* |
| 364 | * deal with seq counter wrapping correctly. |
| 365 | * refer to timer_after() for jiffies wrapping handling |
| 366 | */ |
| 367 | static inline int tkip_replay_check(u32 iv32_n, u16 iv16_n, |
| 368 | u32 iv32_o, u16 iv16_o) |
| 369 | { |
| 370 | if ((s32)iv32_n - (s32)iv32_o < 0 || |
| 371 | (iv32_n == iv32_o && iv16_n <= iv16_o)) |
| 372 | return 1; |
| 373 | return 0; |
| 374 | } |
| 375 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 376 | static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
| 377 | { |
| 378 | struct ieee80211_tkip_data *tkey = priv; |
| 379 | u8 rc4key[16]; |
| 380 | u8 keyidx, *pos; |
| 381 | u32 iv32; |
| 382 | u16 iv16; |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 383 | struct ieee80211_hdr_4addr *hdr; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 384 | u8 icv[4]; |
| 385 | u32 crc; |
| 386 | struct scatterlist sg; |
| 387 | int plen; |
| 388 | |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 389 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 390 | |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 391 | if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) { |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 392 | if (net_ratelimit()) { |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 393 | printk(KERN_DEBUG ": TKIP countermeasures: dropped " |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 394 | "received packet from " MAC_FMT "\n", |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 395 | MAC_ARG(hdr->addr2)); |
James Ketrenos | 20d6471 | 2005-09-21 11:53:43 -0500 | [diff] [blame] | 396 | } |
| 397 | return -1; |
| 398 | } |
| 399 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 400 | if (skb->len < hdr_len + 8 + 4) |
| 401 | return -1; |
| 402 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 403 | pos = skb->data + hdr_len; |
| 404 | keyidx = pos[3]; |
| 405 | if (!(keyidx & (1 << 5))) { |
| 406 | if (net_ratelimit()) { |
| 407 | printk(KERN_DEBUG "TKIP: received packet without ExtIV" |
| 408 | " flag from " MAC_FMT "\n", MAC_ARG(hdr->addr2)); |
| 409 | } |
| 410 | return -2; |
| 411 | } |
| 412 | keyidx >>= 6; |
| 413 | if (tkey->key_idx != keyidx) { |
| 414 | printk(KERN_DEBUG "TKIP: RX tkey->key_idx=%d frame " |
| 415 | "keyidx=%d priv=%p\n", tkey->key_idx, keyidx, priv); |
| 416 | return -6; |
| 417 | } |
| 418 | if (!tkey->key_set) { |
| 419 | if (net_ratelimit()) { |
| 420 | printk(KERN_DEBUG "TKIP: received packet from " MAC_FMT |
| 421 | " with keyid=%d that does not have a configured" |
| 422 | " key\n", MAC_ARG(hdr->addr2), keyidx); |
| 423 | } |
| 424 | return -3; |
| 425 | } |
| 426 | iv16 = (pos[0] << 8) | pos[2]; |
| 427 | iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24); |
| 428 | pos += 8; |
| 429 | |
Zhu Yi | b4328d8 | 2006-08-21 11:33:09 +0800 | [diff] [blame^] | 430 | if (tkip_replay_check(iv32, iv16, tkey->rx_iv32, tkey->rx_iv16)) { |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 431 | if (net_ratelimit()) { |
| 432 | printk(KERN_DEBUG "TKIP: replay detected: STA=" MAC_FMT |
| 433 | " previous TSC %08x%04x received TSC " |
| 434 | "%08x%04x\n", MAC_ARG(hdr->addr2), |
| 435 | tkey->rx_iv32, tkey->rx_iv16, iv32, iv16); |
| 436 | } |
| 437 | tkey->dot11RSNAStatsTKIPReplays++; |
| 438 | return -4; |
| 439 | } |
| 440 | |
| 441 | if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) { |
| 442 | tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32); |
| 443 | tkey->rx_phase1_done = 1; |
| 444 | } |
| 445 | tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16); |
| 446 | |
| 447 | plen = skb->len - hdr_len - 12; |
| 448 | |
| 449 | crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16); |
| 450 | sg.page = virt_to_page(pos); |
| 451 | sg.offset = offset_in_page(pos); |
| 452 | sg.length = plen + 4; |
| 453 | crypto_cipher_decrypt(tkey->tfm_arc4, &sg, &sg, plen + 4); |
| 454 | |
| 455 | crc = ~crc32_le(~0, pos, plen); |
| 456 | icv[0] = crc; |
| 457 | icv[1] = crc >> 8; |
| 458 | icv[2] = crc >> 16; |
| 459 | icv[3] = crc >> 24; |
| 460 | if (memcmp(icv, pos + plen, 4) != 0) { |
| 461 | if (iv32 != tkey->rx_iv32) { |
| 462 | /* Previously cached Phase1 result was already lost, so |
| 463 | * it needs to be recalculated for the next packet. */ |
| 464 | tkey->rx_phase1_done = 0; |
| 465 | } |
| 466 | if (net_ratelimit()) { |
| 467 | printk(KERN_DEBUG "TKIP: ICV error detected: STA=" |
| 468 | MAC_FMT "\n", MAC_ARG(hdr->addr2)); |
| 469 | } |
| 470 | tkey->dot11RSNAStatsTKIPICVErrors++; |
| 471 | return -5; |
| 472 | } |
| 473 | |
| 474 | /* Update real counters only after Michael MIC verification has |
| 475 | * completed */ |
| 476 | tkey->rx_iv32_new = iv32; |
| 477 | tkey->rx_iv16_new = iv16; |
| 478 | |
| 479 | /* Remove IV and ICV */ |
| 480 | memmove(skb->data + 8, skb->data, hdr_len); |
| 481 | skb_pull(skb, 8); |
| 482 | skb_trim(skb, skb->len - 4); |
| 483 | |
| 484 | return keyidx; |
| 485 | } |
| 486 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 487 | static int michael_mic(struct ieee80211_tkip_data *tkey, u8 * key, u8 * hdr, |
| 488 | u8 * data, size_t data_len, u8 * mic) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 489 | { |
| 490 | struct scatterlist sg[2]; |
| 491 | |
| 492 | if (tkey->tfm_michael == NULL) { |
| 493 | printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n"); |
| 494 | return -1; |
| 495 | } |
| 496 | sg[0].page = virt_to_page(hdr); |
| 497 | sg[0].offset = offset_in_page(hdr); |
| 498 | sg[0].length = 16; |
| 499 | |
| 500 | sg[1].page = virt_to_page(data); |
| 501 | sg[1].offset = offset_in_page(data); |
| 502 | sg[1].length = data_len; |
| 503 | |
| 504 | crypto_digest_init(tkey->tfm_michael); |
| 505 | crypto_digest_setkey(tkey->tfm_michael, key, 8); |
| 506 | crypto_digest_update(tkey->tfm_michael, sg, 2); |
| 507 | crypto_digest_final(tkey->tfm_michael, mic); |
| 508 | |
| 509 | return 0; |
| 510 | } |
| 511 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 512 | static void michael_mic_hdr(struct sk_buff *skb, u8 * hdr) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 513 | { |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 514 | struct ieee80211_hdr_4addr *hdr11; |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 515 | u16 stype; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 516 | |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 517 | hdr11 = (struct ieee80211_hdr_4addr *)skb->data; |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 518 | stype = WLAN_FC_GET_STYPE(le16_to_cpu(hdr11->frame_ctl)); |
| 519 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 520 | switch (le16_to_cpu(hdr11->frame_ctl) & |
| 521 | (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { |
| 522 | case IEEE80211_FCTL_TODS: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 523 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ |
| 524 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 525 | break; |
| 526 | case IEEE80211_FCTL_FROMDS: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 527 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ |
| 528 | memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 529 | break; |
| 530 | case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 531 | memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ |
| 532 | memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 533 | break; |
| 534 | case 0: |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 535 | memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ |
| 536 | memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 537 | break; |
| 538 | } |
| 539 | |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 540 | if (stype & IEEE80211_STYPE_QOS_DATA) { |
| 541 | const struct ieee80211_hdr_3addrqos *qoshdr = |
| 542 | (struct ieee80211_hdr_3addrqos *)skb->data; |
Zhu Yi | 65b6a27 | 2006-08-21 11:32:31 +0800 | [diff] [blame] | 543 | hdr[12] = qoshdr->qos_ctl & cpu_to_le16(IEEE80211_QCTL_TID); |
Zhu Yi | ea28415 | 2006-04-13 17:17:06 +0800 | [diff] [blame] | 544 | } else |
| 545 | hdr[12] = 0; /* priority */ |
| 546 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 547 | hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 548 | } |
| 549 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 550 | static int ieee80211_michael_mic_add(struct sk_buff *skb, int hdr_len, |
| 551 | void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 552 | { |
| 553 | struct ieee80211_tkip_data *tkey = priv; |
| 554 | u8 *pos; |
| 555 | |
| 556 | if (skb_tailroom(skb) < 8 || skb->len < hdr_len) { |
| 557 | printk(KERN_DEBUG "Invalid packet for Michael MIC add " |
| 558 | "(tailroom=%d hdr_len=%d skb->len=%d)\n", |
| 559 | skb_tailroom(skb), hdr_len, skb->len); |
| 560 | return -1; |
| 561 | } |
| 562 | |
| 563 | michael_mic_hdr(skb, tkey->tx_hdr); |
| 564 | pos = skb_put(skb, 8); |
| 565 | if (michael_mic(tkey, &tkey->key[16], tkey->tx_hdr, |
| 566 | skb->data + hdr_len, skb->len - 8 - hdr_len, pos)) |
| 567 | return -1; |
| 568 | |
| 569 | return 0; |
| 570 | } |
| 571 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 572 | static void ieee80211_michael_mic_failure(struct net_device *dev, |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 573 | struct ieee80211_hdr_4addr *hdr, |
| 574 | int keyidx) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 575 | { |
| 576 | union iwreq_data wrqu; |
| 577 | struct iw_michaelmicfailure ev; |
| 578 | |
| 579 | /* TODO: needed parameters: count, keyid, key type, TSC */ |
| 580 | memset(&ev, 0, sizeof(ev)); |
| 581 | ev.flags = keyidx & IW_MICFAILURE_KEY_ID; |
| 582 | if (hdr->addr1[0] & 0x01) |
| 583 | ev.flags |= IW_MICFAILURE_GROUP; |
| 584 | else |
| 585 | ev.flags |= IW_MICFAILURE_PAIRWISE; |
| 586 | ev.src_addr.sa_family = ARPHRD_ETHER; |
| 587 | memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN); |
| 588 | memset(&wrqu, 0, sizeof(wrqu)); |
| 589 | wrqu.data.length = sizeof(ev); |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 590 | wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *)&ev); |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 591 | } |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 592 | |
| 593 | static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx, |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 594 | int hdr_len, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 595 | { |
| 596 | struct ieee80211_tkip_data *tkey = priv; |
| 597 | u8 mic[8]; |
| 598 | |
| 599 | if (!tkey->key_set) |
| 600 | return -1; |
| 601 | |
| 602 | michael_mic_hdr(skb, tkey->rx_hdr); |
| 603 | if (michael_mic(tkey, &tkey->key[24], tkey->rx_hdr, |
| 604 | skb->data + hdr_len, skb->len - 8 - hdr_len, mic)) |
| 605 | return -1; |
| 606 | if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) { |
James Ketrenos | ee34af3 | 2005-09-21 11:54:36 -0500 | [diff] [blame] | 607 | struct ieee80211_hdr_4addr *hdr; |
| 608 | hdr = (struct ieee80211_hdr_4addr *)skb->data; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 609 | printk(KERN_DEBUG "%s: Michael MIC verification failed for " |
| 610 | "MSDU from " MAC_FMT " keyidx=%d\n", |
| 611 | skb->dev ? skb->dev->name : "N/A", MAC_ARG(hdr->addr2), |
| 612 | keyidx); |
| 613 | if (skb->dev) |
| 614 | ieee80211_michael_mic_failure(skb->dev, hdr, keyidx); |
| 615 | tkey->dot11RSNAStatsTKIPLocalMICFailures++; |
| 616 | return -1; |
| 617 | } |
| 618 | |
| 619 | /* Update TSC counters for RX now that the packet verification has |
| 620 | * completed. */ |
| 621 | tkey->rx_iv32 = tkey->rx_iv32_new; |
| 622 | tkey->rx_iv16 = tkey->rx_iv16_new; |
| 623 | |
| 624 | skb_trim(skb, skb->len - 8); |
| 625 | |
| 626 | return 0; |
| 627 | } |
| 628 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 629 | 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] | 630 | { |
| 631 | struct ieee80211_tkip_data *tkey = priv; |
| 632 | int keyidx; |
| 633 | struct crypto_tfm *tfm = tkey->tfm_michael; |
| 634 | struct crypto_tfm *tfm2 = tkey->tfm_arc4; |
| 635 | |
| 636 | keyidx = tkey->key_idx; |
| 637 | memset(tkey, 0, sizeof(*tkey)); |
| 638 | tkey->key_idx = keyidx; |
| 639 | tkey->tfm_michael = tfm; |
| 640 | tkey->tfm_arc4 = tfm2; |
| 641 | if (len == TKIP_KEY_LEN) { |
| 642 | memcpy(tkey->key, key, TKIP_KEY_LEN); |
| 643 | tkey->key_set = 1; |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 644 | tkey->tx_iv16 = 1; /* TSC is initialized to 1 */ |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 645 | if (seq) { |
| 646 | tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 647 | (seq[3] << 8) | seq[2]; |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 648 | tkey->rx_iv16 = (seq[1] << 8) | seq[0]; |
| 649 | } |
| 650 | } else if (len == 0) |
| 651 | tkey->key_set = 0; |
| 652 | else |
| 653 | return -1; |
| 654 | |
| 655 | return 0; |
| 656 | } |
| 657 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 658 | 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] | 659 | { |
| 660 | struct ieee80211_tkip_data *tkey = priv; |
| 661 | |
| 662 | if (len < TKIP_KEY_LEN) |
| 663 | return -1; |
| 664 | |
| 665 | if (!tkey->key_set) |
| 666 | return 0; |
| 667 | memcpy(key, tkey->key, TKIP_KEY_LEN); |
| 668 | |
| 669 | if (seq) { |
| 670 | /* Return the sequence number of the last transmitted frame. */ |
| 671 | u16 iv16 = tkey->tx_iv16; |
| 672 | u32 iv32 = tkey->tx_iv32; |
| 673 | if (iv16 == 0) |
| 674 | iv32--; |
| 675 | iv16--; |
| 676 | seq[0] = tkey->tx_iv16; |
| 677 | seq[1] = tkey->tx_iv16 >> 8; |
| 678 | seq[2] = tkey->tx_iv32; |
| 679 | seq[3] = tkey->tx_iv32 >> 8; |
| 680 | seq[4] = tkey->tx_iv32 >> 16; |
| 681 | seq[5] = tkey->tx_iv32 >> 24; |
| 682 | } |
| 683 | |
| 684 | return TKIP_KEY_LEN; |
| 685 | } |
| 686 | |
Jeff Garzik | 0edd5b4 | 2005-09-07 00:48:31 -0400 | [diff] [blame] | 687 | static char *ieee80211_tkip_print_stats(char *p, void *priv) |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 688 | { |
| 689 | struct ieee80211_tkip_data *tkip = priv; |
| 690 | p += sprintf(p, "key[%d] alg=TKIP key_set=%d " |
| 691 | "tx_pn=%02x%02x%02x%02x%02x%02x " |
| 692 | "rx_pn=%02x%02x%02x%02x%02x%02x " |
| 693 | "replays=%d icv_errors=%d local_mic_failures=%d\n", |
| 694 | tkip->key_idx, tkip->key_set, |
| 695 | (tkip->tx_iv32 >> 24) & 0xff, |
| 696 | (tkip->tx_iv32 >> 16) & 0xff, |
| 697 | (tkip->tx_iv32 >> 8) & 0xff, |
| 698 | tkip->tx_iv32 & 0xff, |
| 699 | (tkip->tx_iv16 >> 8) & 0xff, |
| 700 | tkip->tx_iv16 & 0xff, |
| 701 | (tkip->rx_iv32 >> 24) & 0xff, |
| 702 | (tkip->rx_iv32 >> 16) & 0xff, |
| 703 | (tkip->rx_iv32 >> 8) & 0xff, |
| 704 | tkip->rx_iv32 & 0xff, |
| 705 | (tkip->rx_iv16 >> 8) & 0xff, |
| 706 | tkip->rx_iv16 & 0xff, |
| 707 | tkip->dot11RSNAStatsTKIPReplays, |
| 708 | tkip->dot11RSNAStatsTKIPICVErrors, |
| 709 | tkip->dot11RSNAStatsTKIPLocalMICFailures); |
| 710 | return p; |
| 711 | } |
| 712 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 713 | static struct ieee80211_crypto_ops ieee80211_crypt_tkip = { |
James Ketrenos | 74079fd | 2005-09-13 17:35:21 -0500 | [diff] [blame] | 714 | .name = "TKIP", |
| 715 | .init = ieee80211_tkip_init, |
| 716 | .deinit = ieee80211_tkip_deinit, |
Zhu Yi | 9184d93 | 2006-01-19 16:22:32 +0800 | [diff] [blame] | 717 | .build_iv = ieee80211_tkip_hdr, |
James Ketrenos | 74079fd | 2005-09-13 17:35:21 -0500 | [diff] [blame] | 718 | .encrypt_mpdu = ieee80211_tkip_encrypt, |
| 719 | .decrypt_mpdu = ieee80211_tkip_decrypt, |
| 720 | .encrypt_msdu = ieee80211_michael_mic_add, |
| 721 | .decrypt_msdu = ieee80211_michael_mic_verify, |
| 722 | .set_key = ieee80211_tkip_set_key, |
| 723 | .get_key = ieee80211_tkip_get_key, |
| 724 | .print_stats = ieee80211_tkip_print_stats, |
James Ketrenos | 1264fc0 | 2005-09-21 11:54:53 -0500 | [diff] [blame] | 725 | .extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */ |
| 726 | .extra_mpdu_postfix_len = 4, /* ICV */ |
| 727 | .extra_msdu_postfix_len = 8, /* MIC */ |
James Ketrenos | 6eb6edf | 2005-09-22 10:34:15 +0000 | [diff] [blame] | 728 | .get_flags = ieee80211_tkip_get_flags, |
| 729 | .set_flags = ieee80211_tkip_set_flags, |
James Ketrenos | 74079fd | 2005-09-13 17:35:21 -0500 | [diff] [blame] | 730 | .owner = THIS_MODULE, |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 731 | }; |
| 732 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 733 | static int __init ieee80211_crypto_tkip_init(void) |
| 734 | { |
| 735 | return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip); |
| 736 | } |
| 737 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 738 | static void __exit ieee80211_crypto_tkip_exit(void) |
| 739 | { |
| 740 | ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip); |
| 741 | } |
| 742 | |
Jeff Garzik | b453872 | 2005-05-12 22:48:20 -0400 | [diff] [blame] | 743 | module_init(ieee80211_crypto_tkip_init); |
| 744 | module_exit(ieee80211_crypto_tkip_exit); |