Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Host AP crypt: host-based CCMP 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 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 12 | #include <linux/version.h> |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [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> |
| 19 | #include <linux/if_ether.h> |
| 20 | #include <linux/if_arp.h> |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 21 | #include <linux/string.h> |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 22 | #include <linux/wireless.h> |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 23 | #include "rtllib.h" |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 24 | |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 25 | #include <linux/crypto.h> |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 26 | |
Mike McCormack | cb76215 | 2011-07-11 08:56:20 +0900 | [diff] [blame] | 27 | #include <linux/scatterlist.h> |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 28 | |
| 29 | #define AES_BLOCK_LEN 16 |
| 30 | #define CCMP_HDR_LEN 8 |
| 31 | #define CCMP_MIC_LEN 8 |
| 32 | #define CCMP_TK_LEN 16 |
| 33 | #define CCMP_PN_LEN 6 |
| 34 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 35 | struct rtllib_ccmp_data { |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 36 | u8 key[CCMP_TK_LEN]; |
| 37 | int key_set; |
| 38 | |
| 39 | u8 tx_pn[CCMP_PN_LEN]; |
| 40 | u8 rx_pn[CCMP_PN_LEN]; |
| 41 | |
| 42 | u32 dot11RSNAStatsCCMPFormatErrors; |
| 43 | u32 dot11RSNAStatsCCMPReplays; |
| 44 | u32 dot11RSNAStatsCCMPDecryptErrors; |
| 45 | |
| 46 | int key_idx; |
| 47 | |
| 48 | struct crypto_tfm *tfm; |
| 49 | |
| 50 | /* scratch buffers for virt_to_page() (crypto API) */ |
| 51 | u8 tx_b0[AES_BLOCK_LEN], tx_b[AES_BLOCK_LEN], |
| 52 | tx_e[AES_BLOCK_LEN], tx_s0[AES_BLOCK_LEN]; |
| 53 | u8 rx_b0[AES_BLOCK_LEN], rx_b[AES_BLOCK_LEN], rx_a[AES_BLOCK_LEN]; |
| 54 | }; |
| 55 | |
Larry Finger | ec0dc6be | 2011-08-25 14:07:04 -0500 | [diff] [blame^] | 56 | static void rtllib_ccmp_aes_encrypt(struct crypto_tfm *tfm, |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 57 | const u8 pt[16], u8 ct[16]) |
| 58 | { |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 59 | crypto_cipher_encrypt_one((void *)tfm, ct, pt); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 60 | } |
| 61 | |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 62 | static void *rtllib_ccmp_init(int key_idx) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 63 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 64 | struct rtllib_ccmp_data *priv; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 65 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 66 | priv = kmalloc(sizeof(*priv), GFP_ATOMIC); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 67 | if (priv == NULL) |
| 68 | goto fail; |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 69 | memset(priv, 0, sizeof(*priv)); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 70 | priv->key_idx = key_idx; |
| 71 | |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 72 | priv->tfm = (void *)crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 73 | if (IS_ERR(priv->tfm)) { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 74 | printk(KERN_DEBUG "rtllib_crypt_ccmp: could not allocate " |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 75 | "crypto API aes\n"); |
| 76 | priv->tfm = NULL; |
| 77 | goto fail; |
| 78 | } |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 79 | return priv; |
| 80 | |
| 81 | fail: |
| 82 | if (priv) { |
| 83 | if (priv->tfm) |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 84 | crypto_free_cipher((void *)priv->tfm); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 85 | kfree(priv); |
| 86 | } |
| 87 | |
| 88 | return NULL; |
| 89 | } |
| 90 | |
| 91 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 92 | static void rtllib_ccmp_deinit(void *priv) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 93 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 94 | struct rtllib_ccmp_data *_priv = priv; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 95 | if (_priv && _priv->tfm) |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 96 | crypto_free_cipher((void *)_priv->tfm); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 97 | kfree(priv); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | static inline void xor_block(u8 *b, u8 *a, size_t len) |
| 102 | { |
| 103 | int i; |
| 104 | for (i = 0; i < len; i++) |
| 105 | b[i] ^= a[i]; |
| 106 | } |
| 107 | |
| 108 | |
| 109 | |
| 110 | static void ccmp_init_blocks(struct crypto_tfm *tfm, |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 111 | struct rtllib_hdr_4addr *hdr, |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 112 | u8 *pn, size_t dlen, u8 *b0, u8 *auth, |
| 113 | u8 *s0) |
| 114 | { |
| 115 | u8 *pos, qc = 0; |
| 116 | size_t aad_len; |
| 117 | u16 fc; |
| 118 | int a4_included, qc_included; |
| 119 | u8 aad[2 * AES_BLOCK_LEN]; |
| 120 | |
| 121 | fc = le16_to_cpu(hdr->frame_ctl); |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 122 | a4_included = ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) == |
| 123 | (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 124 | /* |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 125 | qc_included = ((WLAN_FC_GET_TYPE(fc) == RTLLIB_FTYPE_DATA) && |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 126 | (WLAN_FC_GET_STYPE(fc) & 0x08)); |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 127 | */ |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 128 | qc_included = ((WLAN_FC_GET_TYPE(fc) == RTLLIB_FTYPE_DATA) && |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 129 | (WLAN_FC_GET_STYPE(fc) & 0x80)); |
| 130 | aad_len = 22; |
| 131 | if (a4_included) |
| 132 | aad_len += 6; |
| 133 | if (qc_included) { |
| 134 | pos = (u8 *) &hdr->addr4; |
| 135 | if (a4_included) |
| 136 | pos += 6; |
| 137 | qc = *pos & 0x0f; |
| 138 | aad_len += 2; |
| 139 | } |
| 140 | /* CCM Initial Block: |
| 141 | * Flag (Include authentication header, M=3 (8-octet MIC), |
| 142 | * L=1 (2-octet Dlen)) |
| 143 | * Nonce: 0x00 | A2 | PN |
| 144 | * Dlen */ |
| 145 | b0[0] = 0x59; |
| 146 | b0[1] = qc; |
| 147 | memcpy(b0 + 2, hdr->addr2, ETH_ALEN); |
| 148 | memcpy(b0 + 8, pn, CCMP_PN_LEN); |
| 149 | b0[14] = (dlen >> 8) & 0xff; |
| 150 | b0[15] = dlen & 0xff; |
| 151 | |
| 152 | /* AAD: |
| 153 | * FC with bits 4..6 and 11..13 masked to zero; 14 is always one |
| 154 | * A1 | A2 | A3 |
| 155 | * SC with bits 4..15 (seq#) masked to zero |
| 156 | * A4 (if present) |
| 157 | * QC (if present) |
| 158 | */ |
| 159 | pos = (u8 *) hdr; |
| 160 | aad[0] = 0; /* aad_len >> 8 */ |
| 161 | aad[1] = aad_len & 0xff; |
| 162 | aad[2] = pos[0] & 0x8f; |
| 163 | aad[3] = pos[1] & 0xc7; |
| 164 | memcpy(aad + 4, hdr->addr1, 3 * ETH_ALEN); |
| 165 | pos = (u8 *) &hdr->seq_ctl; |
| 166 | aad[22] = pos[0] & 0x0f; |
| 167 | aad[23] = 0; /* all bits masked */ |
| 168 | memset(aad + 24, 0, 8); |
| 169 | if (a4_included) |
| 170 | memcpy(aad + 24, hdr->addr4, ETH_ALEN); |
| 171 | if (qc_included) { |
| 172 | aad[a4_included ? 30 : 24] = qc; |
| 173 | /* rest of QC masked */ |
| 174 | } |
| 175 | |
| 176 | /* Start with the first block and AAD */ |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 177 | rtllib_ccmp_aes_encrypt(tfm, b0, auth); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 178 | xor_block(auth, aad, AES_BLOCK_LEN); |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 179 | rtllib_ccmp_aes_encrypt(tfm, auth, auth); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 180 | xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN); |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 181 | rtllib_ccmp_aes_encrypt(tfm, auth, auth); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 182 | b0[0] &= 0x07; |
| 183 | b0[14] = b0[15] = 0; |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 184 | rtllib_ccmp_aes_encrypt(tfm, b0, s0); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | |
| 188 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 189 | static int rtllib_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 190 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 191 | struct rtllib_ccmp_data *key = priv; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 192 | int data_len, i; |
| 193 | u8 *pos; |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 194 | struct rtllib_hdr_4addr *hdr; |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 195 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
| 196 | MAX_DEV_ADDR_SIZE); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 197 | if (skb_headroom(skb) < CCMP_HDR_LEN || |
| 198 | skb_tailroom(skb) < CCMP_MIC_LEN || |
| 199 | skb->len < hdr_len) |
| 200 | return -1; |
| 201 | |
| 202 | data_len = skb->len - hdr_len; |
| 203 | pos = skb_push(skb, CCMP_HDR_LEN); |
| 204 | memmove(pos, pos + CCMP_HDR_LEN, hdr_len); |
| 205 | pos += hdr_len; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 206 | |
| 207 | i = CCMP_PN_LEN - 1; |
| 208 | while (i >= 0) { |
| 209 | key->tx_pn[i]++; |
| 210 | if (key->tx_pn[i] != 0) |
| 211 | break; |
| 212 | i--; |
| 213 | } |
| 214 | |
| 215 | *pos++ = key->tx_pn[5]; |
| 216 | *pos++ = key->tx_pn[4]; |
| 217 | *pos++ = 0; |
| 218 | *pos++ = (key->key_idx << 6) | (1 << 5) /* Ext IV included */; |
| 219 | *pos++ = key->tx_pn[3]; |
| 220 | *pos++ = key->tx_pn[2]; |
| 221 | *pos++ = key->tx_pn[1]; |
| 222 | *pos++ = key->tx_pn[0]; |
| 223 | |
| 224 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 225 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
| 226 | if (!tcb_desc->bHwSec) { |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 227 | int blocks, last, len; |
| 228 | u8 *mic; |
| 229 | u8 *b0 = key->tx_b0; |
| 230 | u8 *b = key->tx_b; |
| 231 | u8 *e = key->tx_e; |
| 232 | u8 *s0 = key->tx_s0; |
| 233 | |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 234 | mic = skb_put(skb, CCMP_MIC_LEN); |
| 235 | |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 236 | ccmp_init_blocks(key->tfm, hdr, key->tx_pn, data_len, |
| 237 | b0, b, s0); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 238 | |
| 239 | blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN; |
| 240 | last = data_len % AES_BLOCK_LEN; |
| 241 | |
| 242 | for (i = 1; i <= blocks; i++) { |
| 243 | len = (i == blocks && last) ? last : AES_BLOCK_LEN; |
| 244 | /* Authentication */ |
| 245 | xor_block(b, pos, len); |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 246 | rtllib_ccmp_aes_encrypt(key->tfm, b, b); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 247 | /* Encryption, with counter */ |
| 248 | b0[14] = (i >> 8) & 0xff; |
| 249 | b0[15] = i & 0xff; |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 250 | rtllib_ccmp_aes_encrypt(key->tfm, b0, e); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 251 | xor_block(pos, e, len); |
| 252 | pos += len; |
| 253 | } |
| 254 | |
| 255 | for (i = 0; i < CCMP_MIC_LEN; i++) |
| 256 | mic[i] = b[i] ^ s0[i]; |
| 257 | } |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 262 | static int rtllib_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 263 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 264 | struct rtllib_ccmp_data *key = priv; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 265 | u8 keyidx, *pos; |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 266 | struct rtllib_hdr_4addr *hdr; |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 267 | struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + |
| 268 | MAX_DEV_ADDR_SIZE); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 269 | u8 pn[6]; |
| 270 | |
| 271 | if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN) { |
| 272 | key->dot11RSNAStatsCCMPFormatErrors++; |
| 273 | return -1; |
| 274 | } |
| 275 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 276 | hdr = (struct rtllib_hdr_4addr *) skb->data; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 277 | pos = skb->data + hdr_len; |
| 278 | keyidx = pos[3]; |
| 279 | if (!(keyidx & (1 << 5))) { |
| 280 | if (net_ratelimit()) { |
| 281 | printk(KERN_DEBUG "CCMP: received packet without ExtIV" |
Larry Finger | ac50dda | 2011-08-25 14:07:03 -0500 | [diff] [blame] | 282 | " flag from %pM\n", hdr->addr2); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 283 | } |
| 284 | key->dot11RSNAStatsCCMPFormatErrors++; |
| 285 | return -2; |
| 286 | } |
| 287 | keyidx >>= 6; |
| 288 | if (key->key_idx != keyidx) { |
| 289 | printk(KERN_DEBUG "CCMP: RX tkey->key_idx=%d frame " |
| 290 | "keyidx=%d priv=%p\n", key->key_idx, keyidx, priv); |
| 291 | return -6; |
| 292 | } |
| 293 | if (!key->key_set) { |
| 294 | if (net_ratelimit()) { |
Larry Finger | ac50dda | 2011-08-25 14:07:03 -0500 | [diff] [blame] | 295 | printk(KERN_DEBUG "CCMP: received packet from %pM" |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 296 | " with keyid=%d that does not have a configured" |
Larry Finger | ac50dda | 2011-08-25 14:07:03 -0500 | [diff] [blame] | 297 | " key\n", hdr->addr2, keyidx); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 298 | } |
| 299 | return -3; |
| 300 | } |
| 301 | |
| 302 | pn[0] = pos[7]; |
| 303 | pn[1] = pos[6]; |
| 304 | pn[2] = pos[5]; |
| 305 | pn[3] = pos[4]; |
| 306 | pn[4] = pos[1]; |
| 307 | pn[5] = pos[0]; |
| 308 | pos += 8; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 309 | if (memcmp(pn, key->rx_pn, CCMP_PN_LEN) <= 0) { |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 310 | key->dot11RSNAStatsCCMPReplays++; |
| 311 | return -4; |
| 312 | } |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 313 | if (!tcb_desc->bHwSec) { |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 314 | size_t data_len = skb->len - hdr_len - CCMP_HDR_LEN - |
| 315 | CCMP_MIC_LEN; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 316 | u8 *mic = skb->data + skb->len - CCMP_MIC_LEN; |
| 317 | u8 *b0 = key->rx_b0; |
| 318 | u8 *b = key->rx_b; |
| 319 | u8 *a = key->rx_a; |
| 320 | int i, blocks, last, len; |
| 321 | |
| 322 | |
| 323 | ccmp_init_blocks(key->tfm, hdr, pn, data_len, b0, a, b); |
| 324 | xor_block(mic, b, CCMP_MIC_LEN); |
| 325 | |
| 326 | blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN; |
| 327 | last = data_len % AES_BLOCK_LEN; |
| 328 | |
| 329 | for (i = 1; i <= blocks; i++) { |
| 330 | len = (i == blocks && last) ? last : AES_BLOCK_LEN; |
| 331 | /* Decrypt, with counter */ |
| 332 | b0[14] = (i >> 8) & 0xff; |
| 333 | b0[15] = i & 0xff; |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 334 | rtllib_ccmp_aes_encrypt(key->tfm, b0, b); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 335 | xor_block(pos, b, len); |
| 336 | /* Authentication */ |
| 337 | xor_block(a, pos, len); |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 338 | rtllib_ccmp_aes_encrypt(key->tfm, a, a); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 339 | pos += len; |
| 340 | } |
| 341 | |
| 342 | if (memcmp(mic, a, CCMP_MIC_LEN) != 0) { |
| 343 | if (net_ratelimit()) { |
| 344 | printk(KERN_DEBUG "CCMP: decrypt failed: STA=" |
Larry Finger | ac50dda | 2011-08-25 14:07:03 -0500 | [diff] [blame] | 345 | " %pM\n", hdr->addr2); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 346 | } |
| 347 | key->dot11RSNAStatsCCMPDecryptErrors++; |
| 348 | return -5; |
| 349 | } |
| 350 | |
| 351 | memcpy(key->rx_pn, pn, CCMP_PN_LEN); |
| 352 | } |
| 353 | /* Remove hdr and MIC */ |
| 354 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdr_len); |
| 355 | skb_pull(skb, CCMP_HDR_LEN); |
| 356 | skb_trim(skb, skb->len - CCMP_MIC_LEN); |
| 357 | |
| 358 | return keyidx; |
| 359 | } |
| 360 | |
| 361 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 362 | static int rtllib_ccmp_set_key(void *key, int len, u8 *seq, void *priv) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 363 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 364 | struct rtllib_ccmp_data *data = priv; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 365 | int keyidx; |
| 366 | struct crypto_tfm *tfm = data->tfm; |
| 367 | |
| 368 | keyidx = data->key_idx; |
| 369 | memset(data, 0, sizeof(*data)); |
| 370 | data->key_idx = keyidx; |
| 371 | data->tfm = tfm; |
| 372 | if (len == CCMP_TK_LEN) { |
| 373 | memcpy(data->key, key, CCMP_TK_LEN); |
| 374 | data->key_set = 1; |
| 375 | if (seq) { |
| 376 | data->rx_pn[0] = seq[5]; |
| 377 | data->rx_pn[1] = seq[4]; |
| 378 | data->rx_pn[2] = seq[3]; |
| 379 | data->rx_pn[3] = seq[2]; |
| 380 | data->rx_pn[4] = seq[1]; |
| 381 | data->rx_pn[5] = seq[0]; |
| 382 | } |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 383 | crypto_cipher_setkey((void *)data->tfm, data->key, CCMP_TK_LEN); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 384 | } else if (len == 0) |
| 385 | data->key_set = 0; |
| 386 | else |
| 387 | return -1; |
| 388 | |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 393 | static int rtllib_ccmp_get_key(void *key, int len, u8 *seq, void *priv) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 394 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 395 | struct rtllib_ccmp_data *data = priv; |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 396 | |
| 397 | if (len < CCMP_TK_LEN) |
| 398 | return -1; |
| 399 | |
| 400 | if (!data->key_set) |
| 401 | return 0; |
| 402 | memcpy(key, data->key, CCMP_TK_LEN); |
| 403 | |
| 404 | if (seq) { |
| 405 | seq[0] = data->tx_pn[5]; |
| 406 | seq[1] = data->tx_pn[4]; |
| 407 | seq[2] = data->tx_pn[3]; |
| 408 | seq[3] = data->tx_pn[2]; |
| 409 | seq[4] = data->tx_pn[1]; |
| 410 | seq[5] = data->tx_pn[0]; |
| 411 | } |
| 412 | |
| 413 | return CCMP_TK_LEN; |
| 414 | } |
| 415 | |
| 416 | |
Larry Finger | a44325f | 2011-08-25 11:48:23 -0500 | [diff] [blame] | 417 | static char *rtllib_ccmp_print_stats(char *p, void *priv) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 418 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 419 | struct rtllib_ccmp_data *ccmp = priv; |
| 420 | p += sprintf(p, "key[%d] alg=CCMP key_set=%d " |
Larry Finger | ac50dda | 2011-08-25 14:07:03 -0500 | [diff] [blame] | 421 | "tx_pn=%pM rx_pn=%pM " |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 422 | "format_errors=%d replays=%d decrypt_errors=%d\n", |
| 423 | ccmp->key_idx, ccmp->key_set, |
Larry Finger | ac50dda | 2011-08-25 14:07:03 -0500 | [diff] [blame] | 424 | ccmp->tx_pn, ccmp->rx_pn, |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 425 | ccmp->dot11RSNAStatsCCMPFormatErrors, |
| 426 | ccmp->dot11RSNAStatsCCMPReplays, |
| 427 | ccmp->dot11RSNAStatsCCMPDecryptErrors); |
| 428 | |
| 429 | return p; |
| 430 | } |
| 431 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 432 | void rtllib_ccmp_null(void) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 433 | { |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 434 | return; |
| 435 | } |
| 436 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 437 | static struct rtllib_crypto_ops rtllib_crypt_ccmp = { |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 438 | .name = "CCMP", |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 439 | .init = rtllib_ccmp_init, |
| 440 | .deinit = rtllib_ccmp_deinit, |
| 441 | .encrypt_mpdu = rtllib_ccmp_encrypt, |
| 442 | .decrypt_mpdu = rtllib_ccmp_decrypt, |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 443 | .encrypt_msdu = NULL, |
| 444 | .decrypt_msdu = NULL, |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 445 | .set_key = rtllib_ccmp_set_key, |
| 446 | .get_key = rtllib_ccmp_get_key, |
| 447 | .print_stats = rtllib_ccmp_print_stats, |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 448 | .extra_prefix_len = CCMP_HDR_LEN, |
| 449 | .extra_postfix_len = CCMP_MIC_LEN, |
| 450 | .owner = THIS_MODULE, |
| 451 | }; |
| 452 | |
| 453 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 454 | int __init rtllib_crypto_ccmp_init(void) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 455 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 456 | return rtllib_register_crypto_ops(&rtllib_crypt_ccmp); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 460 | void __exit rtllib_crypto_ccmp_exit(void) |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 461 | { |
Larry Finger | 94a7994 | 2011-08-23 19:00:42 -0500 | [diff] [blame] | 462 | rtllib_unregister_crypto_ops(&rtllib_crypt_ccmp); |
Greg Kroah-Hartman | ecdfa44 | 2009-08-04 15:57:55 -0700 | [diff] [blame] | 463 | } |