Release 4.11 net/wireless/lib80211_crypt_tkip.c
/*
* lib80211 crypt: host-based TKIP encryption implementation for lib80211
*
* Copyright (c) 2003-2004, Jouni Malinen <j@w1.fi>
* Copyright (c) 2008, John W. Linville <linville@tuxdriver.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See README and COPYING for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/mm.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <asm/string.h>
#include <linux/wireless.h>
#include <linux/ieee80211.h>
#include <net/iw_handler.h>
#include <crypto/hash.h>
#include <crypto/skcipher.h>
#include <linux/crc32.h>
#include <net/lib80211.h>
MODULE_AUTHOR("Jouni Malinen");
MODULE_DESCRIPTION("lib80211 crypt: TKIP");
MODULE_LICENSE("GPL");
#define TKIP_HDR_LEN 8
struct lib80211_tkip_data {
#define TKIP_KEY_LEN 32
u8 key[TKIP_KEY_LEN];
int key_set;
u32 tx_iv32;
u16 tx_iv16;
u16 tx_ttak[5];
int tx_phase1_done;
u32 rx_iv32;
u16 rx_iv16;
u16 rx_ttak[5];
int rx_phase1_done;
u32 rx_iv32_new;
u16 rx_iv16_new;
u32 dot11RSNAStatsTKIPReplays;
u32 dot11RSNAStatsTKIPICVErrors;
u32 dot11RSNAStatsTKIPLocalMICFailures;
int key_idx;
struct crypto_skcipher *rx_tfm_arc4;
struct crypto_ahash *rx_tfm_michael;
struct crypto_skcipher *tx_tfm_arc4;
struct crypto_ahash *tx_tfm_michael;
/* scratch buffers for virt_to_page() (crypto API) */
u8 rx_hdr[16], tx_hdr[16];
unsigned long flags;
};
static unsigned long lib80211_tkip_set_flags(unsigned long flags, void *priv)
{
struct lib80211_tkip_data *_priv = priv;
unsigned long old_flags = _priv->flags;
_priv->flags = flags;
return old_flags;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
James Ketrenos | 34 | 87.18% | 1 | 33.33% |
Jeff Garzik | 3 | 7.69% | 1 | 33.33% |
John W. Linville | 2 | 5.13% | 1 | 33.33% |
Total | 39 | 100.00% | 3 | 100.00% |
static unsigned long lib80211_tkip_get_flags(void *priv)
{
struct lib80211_tkip_data *_priv = priv;
return _priv->flags;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
James Ketrenos | 20 | 86.96% | 2 | 50.00% |
John W. Linville | 2 | 8.70% | 1 | 25.00% |
Jeff Garzik | 1 | 4.35% | 1 | 25.00% |
Total | 23 | 100.00% | 4 | 100.00% |
static void *lib80211_tkip_init(int key_idx)
{
struct lib80211_tkip_data *priv;
priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
if (priv == NULL)
goto fail;
priv->key_idx = key_idx;
priv->tx_tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(priv->tx_tfm_arc4)) {
priv->tx_tfm_arc4 = NULL;
goto fail;
}
priv->tx_tfm_michael = crypto_alloc_ahash("michael_mic", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(priv->tx_tfm_michael)) {
priv->tx_tfm_michael = NULL;
goto fail;
}
priv->rx_tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(priv->rx_tfm_arc4)) {
priv->rx_tfm_arc4 = NULL;
goto fail;
}
priv->rx_tfm_michael = crypto_alloc_ahash("michael_mic", 0,
CRYPTO_ALG_ASYNC);
if (IS_ERR(priv->rx_tfm_michael)) {
priv->rx_tfm_michael = NULL;
goto fail;
}
return priv;
fail:
if (priv) {
crypto_free_ahash(priv->tx_tfm_michael);
crypto_free_skcipher(priv->tx_tfm_arc4);
crypto_free_ahash(priv->rx_tfm_michael);
crypto_free_skcipher(priv->rx_tfm_arc4);
kfree(priv);
}
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 127 | 57.21% | 3 | 30.00% |
Yi Zhu | 60 | 27.03% | 2 | 20.00% |
Herbert Xu | 29 | 13.06% | 3 | 30.00% |
James Ketrenos | 4 | 1.80% | 1 | 10.00% |
John W. Linville | 2 | 0.90% | 1 | 10.00% |
Total | 222 | 100.00% | 10 | 100.00% |
static void lib80211_tkip_deinit(void *priv)
{
struct lib80211_tkip_data *_priv = priv;
if (_priv) {
crypto_free_ahash(_priv->tx_tfm_michael);
crypto_free_skcipher(_priv->tx_tfm_arc4);
crypto_free_ahash(_priv->rx_tfm_michael);
crypto_free_skcipher(_priv->rx_tfm_arc4);
}
kfree(priv);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 33 | 58.93% | 1 | 25.00% |
Yi Zhu | 17 | 30.36% | 1 | 25.00% |
Herbert Xu | 4 | 7.14% | 1 | 25.00% |
John W. Linville | 2 | 3.57% | 1 | 25.00% |
Total | 56 | 100.00% | 4 | 100.00% |
static inline u16 RotR1(u16 val)
{
return (val >> 1) | (val << 15);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 23 | 100.00% | 1 | 100.00% |
Total | 23 | 100.00% | 1 | 100.00% |
static inline u8 Lo8(u16 val)
{
return val & 0xff;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 15 | 100.00% | 1 | 100.00% |
Total | 15 | 100.00% | 1 | 100.00% |
static inline u8 Hi8(u16 val)
{
return val >> 8;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 15 | 100.00% | 1 | 100.00% |
Total | 15 | 100.00% | 1 | 100.00% |
static inline u16 Lo16(u32 val)
{
return val & 0xffff;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 15 | 100.00% | 1 | 100.00% |
Total | 15 | 100.00% | 1 | 100.00% |
static inline u16 Hi16(u32 val)
{
return val >> 16;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 15 | 100.00% | 1 | 100.00% |
Total | 15 | 100.00% | 1 | 100.00% |
static inline u16 Mk16(u8 hi, u8 lo)
{
return lo | (((u16) hi) << 8);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 27 | 100.00% | 1 | 100.00% |
Total | 27 | 100.00% | 1 | 100.00% |
static inline u16 Mk16_le(__le16 * v)
{
return le16_to_cpu(*v);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 17 | 94.44% | 1 | 50.00% |
Al Viro | 1 | 5.56% | 1 | 50.00% |
Total | 18 | 100.00% | 2 | 100.00% |
static const u16 Sbox[256] = {
0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
};
static inline u16 _S_(u16 v)
{
u16 t = Sbox[Hi8(v)];
return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 44 | 100.00% | 1 | 100.00% |
Total | 44 | 100.00% | 1 | 100.00% |
#define PHASE1_LOOP_COUNT 8
static void tkip_mixing_phase1(u16 * TTAK, const u8 * TK, const u8 * TA,
u32 IV32)
{
int i, j;
/* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */
TTAK[0] = Lo16(IV32);
TTAK[1] = Hi16(IV32);
TTAK[2] = Mk16(TA[1], TA[0]);
TTAK[3] = Mk16(TA[3], TA[2]);
TTAK[4] = Mk16(TA[5], TA[4]);
for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
j = 2 * (i & 1);
TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j]));
TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j]));
TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j]));
TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j]));
TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i;
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 280 | 100.00% | 1 | 100.00% |
Total | 280 | 100.00% | 1 | 100.00% |
static void tkip_mixing_phase2(u8 * WEPSeed, const u8 * TK, const u16 * TTAK,
u16 IV16)
{
/* Make temporary area overlap WEP seed so that the final copy can be
* avoided on little endian hosts. */
u16 *PPK = (u16 *) & WEPSeed[4];
/* Step 1 - make copy of TTAK and bring in TSC */
PPK[0] = TTAK[0];
PPK[1] = TTAK[1];
PPK[2] = TTAK[2];
PPK[3] = TTAK[3];
PPK[4] = TTAK[4];
PPK[5] = TTAK[4] + IV16;
/* Step 2 - 96-bit bijective mixing using S-box */
PPK[0] += _S_(PPK[5] ^ Mk16_le((__le16 *) & TK[0]));
PPK[1] += _S_(PPK[0] ^ Mk16_le((__le16 *) & TK[2]));
PPK[2] += _S_(PPK[1] ^ Mk16_le((__le16 *) & TK[4]));
PPK[3] += _S_(PPK[2] ^ Mk16_le((__le16 *) & TK[6]));
PPK[4] += _S_(PPK[3] ^ Mk16_le((__le16 *) & TK[8]));
PPK[5] += _S_(PPK[4] ^ Mk16_le((__le16 *) & TK[10]));
PPK[0] += RotR1(PPK[5] ^ Mk16_le((__le16 *) & TK[12]));
PPK[1] += RotR1(PPK[0] ^ Mk16_le((__le16 *) & TK[14]));
PPK[2] += RotR1(PPK[1]);
PPK[3] += RotR1(PPK[2]);
PPK[4] += RotR1(PPK[3]);
PPK[5] += RotR1(PPK[4]);
/* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value
* WEPSeed[0..2] is transmitted as WEP IV */
WEPSeed[0] = Hi8(IV16);
WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F;
WEPSeed[2] = Lo8(IV16);
WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((__le16 *) & TK[0])) >> 1);
#ifdef __BIG_ENDIAN
{
int i;
for (i = 0; i < 6; i++)
PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8);
}
#endif
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 466 | 98.11% | 1 | 50.00% |
Al Viro | 9 | 1.89% | 1 | 50.00% |
Total | 475 | 100.00% | 2 | 100.00% |
static int lib80211_tkip_hdr(struct sk_buff *skb, int hdr_len,
u8 * rc4key, int keylen, void *priv)
{
struct lib80211_tkip_data *tkey = priv;
u8 *pos;
struct ieee80211_hdr *hdr;
hdr = (struct ieee80211_hdr *)skb->data;
if (skb_headroom(skb) < TKIP_HDR_LEN || skb->len < hdr_len)
return -1;
if (rc4key == NULL || keylen < 16)
return -1;
if (!tkey->tx_phase1_done) {
tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2,
tkey->tx_iv32);
tkey->tx_phase1_done = 1;
}
tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16);
pos = skb_push(skb, TKIP_HDR_LEN);
memmove(pos, pos + TKIP_HDR_LEN, hdr_len);
pos += hdr_len;
*pos++ = *rc4key;
*pos++ = *(rc4key + 1);
*pos++ = *(rc4key + 2);
*pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */ ;
*pos++ = tkey->tx_iv32 & 0xff;
*pos++ = (tkey->tx_iv32 >> 8) & 0xff;
*pos++ = (tkey->tx_iv32 >> 16) & 0xff;
*pos++ = (tkey->tx_iv32 >> 24) & 0xff;
tkey->tx_iv16++;
if (tkey->tx_iv16 == 0) {
tkey->tx_phase1_done = 0;
tkey->tx_iv32++;
}
return TKIP_HDR_LEN;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 211 | 73.01% | 1 | 16.67% |
Yi Zhu | 44 | 15.22% | 1 | 16.67% |
James Ketrenos | 26 | 9.00% | 2 | 33.33% |
John W. Linville | 4 | 1.38% | 1 | 16.67% |
Andriy Tkachuk | 4 | 1.38% | 1 | 16.67% |
Total | 289 | 100.00% | 6 | 100.00% |
static int lib80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
{
struct lib80211_tkip_data *tkey = priv;
SKCIPHER_REQUEST_ON_STACK(req, tkey->tx_tfm_arc4);
int len;
u8 rc4key[16], *pos, *icv;
u32 crc;
struct scatterlist sg;
int err;
if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) {
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
net_dbg_ratelimited("TKIP countermeasures: dropped TX packet to %pM\n",
hdr->addr1);
return -1;
}
if (skb_tailroom(skb) < 4 || skb->len < hdr_len)
return -1;
len = skb->len - hdr_len;
pos = skb->data + hdr_len;
if ((lib80211_tkip_hdr(skb, hdr_len, rc4key, 16, priv)) < 0)
return -1;
crc = ~crc32_le(~0, pos, len);
icv = skb_put(skb, 4);
icv[0] = crc;
icv[1] = crc >> 8;
icv[2] = crc >> 16;
icv[3] = crc >> 24;
crypto_skcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
sg_init_one(&sg, pos, len + 4);
skcipher_request_set_tfm(req, tkey->tx_tfm_arc4);
skcipher_request_set_callback(req, 0, NULL, NULL);
skcipher_request_set_crypt(req, &sg, &sg, len + 4, NULL);
err = crypto_skcipher_encrypt(req);
skcipher_request_zero(req);
return err;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
James Ketrenos | 113 | 39.65% | 2 | 14.29% |
Yi Zhu | 70 | 24.56% | 3 | 21.43% |
Herbert Xu | 51 | 17.89% | 2 | 14.29% |
Jeff Garzik | 29 | 10.18% | 2 | 14.29% |
Andriy Tkachuk | 9 | 3.16% | 1 | 7.14% |
John W. Linville | 5 | 1.75% | 1 | 7.14% |
Jens Axboe | 5 | 1.75% | 1 | 7.14% |
Joe Perches | 3 | 1.05% | 2 | 14.29% |
Total | 285 | 100.00% | 14 | 100.00% |
/*
* deal with seq counter wrapping correctly.
* refer to timer_after() for jiffies wrapping handling
*/
static inline int tkip_replay_check(u32 iv32_n, u16 iv16_n,
u32 iv32_o, u16 iv16_o)
{
if ((s32)iv32_n - (s32)iv32_o < 0 ||
(iv32_n == iv32_o && iv16_n <= iv16_o))
return 1;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jeff Garzik | 49 | 100.00% | 1 | 100.00% |
Total | 49 | 100.00% | 1 | 100.00% |
static int lib80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
{
struct lib80211_tkip_data *tkey = priv;
SKCIPHER_REQUEST_ON_STACK(req, tkey->rx_tfm_arc4);
u8 rc4key[16];
u8 keyidx, *pos;
u32 iv32;
u16 iv16;
struct ieee80211_hdr *hdr;
u8 icv[4];
u32 crc;
struct scatterlist sg;
int plen;
int err;
hdr = (struct ieee80211_hdr *)skb->data;
if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) {
net_dbg_ratelimited("TKIP countermeasures: dropped received packet from %pM\n",
hdr->addr2);
return -1;
}
if (skb->len < hdr_len + TKIP_HDR_LEN + 4)
return -1;
pos = skb->data + hdr_len;
keyidx = pos[3];
if (!(keyidx & (1 << 5))) {
net_dbg_ratelimited("TKIP: received packet without ExtIV flag from %pM\n",
hdr->addr2);
return -2;
}
keyidx >>= 6;
if (tkey->key_idx != keyidx) {
net_dbg_ratelimited("TKIP: RX tkey->key_idx=%d frame keyidx=%d\n",
tkey->key_idx, keyidx);
return -6;
}
if (!tkey->key_set) {
net_dbg_ratelimited("TKIP: received packet from %pM with keyid=%d that does not have a configured key\n",
hdr->addr2, keyidx);
return -3;
}
iv16 = (pos[0] << 8) | pos[2];
iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
pos += TKIP_HDR_LEN;
if (tkip_replay_check(iv32, iv16, tkey->rx_iv32, tkey->rx_iv16)) {
#ifdef CONFIG_LIB80211_DEBUG
net_dbg_ratelimited("TKIP: replay detected: STA=%pM previous TSC %08x%04x received TSC %08x%04x\n",
hdr->addr2, tkey->rx_iv32, tkey->rx_iv16,
iv32, iv16);
#endif
tkey->dot11RSNAStatsTKIPReplays++;
return -4;
}
if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) {
tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32);
tkey->rx_phase1_done = 1;
}
tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16);
plen = skb->len - hdr_len - 12;
crypto_skcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16);
sg_init_one(&sg, pos, plen + 4);
skcipher_request_set_tfm(req, tkey->rx_tfm_arc4);
skcipher_request_set_callback(req, 0, NULL, NULL);
skcipher_request_set_crypt(req, &sg, &sg, plen + 4, NULL);
err = crypto_skcipher_decrypt(req);
skcipher_request_zero(req);
if (err) {
net_dbg_ratelimited("TKIP: failed to decrypt received packet from %pM\n",
hdr->addr2);
return -7;
}
crc = ~crc32_le(~0, pos, plen);
icv[0] = crc;
icv[1] = crc >> 8;
icv[2] = crc >> 16;
icv[3] = crc >> 24;
if (memcmp(icv, pos + plen, 4) != 0) {
if (iv32 != tkey->rx_iv32) {
/* Previously cached Phase1 result was already lost, so
* it needs to be recalculated for the next packet. */
tkey->rx_phase1_done = 0;
}
#ifdef CONFIG_LIB80211_DEBUG