[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / wep.c

/*
 * Software WEP encryption implementation
 * Copyright 2002, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright 2003, Instant802 Networks, Inc.
 *
 * 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.
 */

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/random.h>
#include <linux/compiler.h>
#include <linux/crc32.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "wep.h"


int ieee80211_wep_init(struct ieee80211_local *local)
{
	/* start WEP IV from a random value */
	get_random_bytes(&local->wep_iv, WEP_IV_LEN);

	local->wep_tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
						CRYPTO_ALG_ASYNC);
	if (IS_ERR(local->wep_tx_tfm))
		return -ENOMEM;

	local->wep_rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
						CRYPTO_ALG_ASYNC);
	if (IS_ERR(local->wep_rx_tfm)) {
		crypto_free_blkcipher(local->wep_tx_tfm);
		return -ENOMEM;
	}

	return 0;
}

void ieee80211_wep_free(struct ieee80211_local *local)
{
	crypto_free_blkcipher(local->wep_tx_tfm);
	crypto_free_blkcipher(local->wep_rx_tfm);
}

static inline int ieee80211_wep_weak_iv(u32 iv, int keylen)
{
	/* Fluhrer, Mantin, and Shamir have reported weaknesses in the
	 * key scheduling algorithm of RC4. At least IVs (KeyByte + 3,
	 * 0xff, N) can be used to speedup attacks, so avoid using them. */
	if ((iv & 0xff00) == 0xff00) {
		u8 B = (iv >> 16) & 0xff;
		if (B >= 3 && B < 3 + keylen)
			return 1;
	}
	return 0;
}


static void ieee80211_wep_get_iv(struct ieee80211_local *local,
				 struct ieee80211_key *key, u8 *iv)
{
	local->wep_iv++;
	if (ieee80211_wep_weak_iv(local->wep_iv, key->conf.keylen))
		local->wep_iv += 0x0100;

	if (!iv)
		return;

	*iv++ = (local->wep_iv >> 16) & 0xff;
	*iv++ = (local->wep_iv >> 8) & 0xff;
	*iv++ = local->wep_iv & 0xff;
	*iv++ = key->conf.keyidx << 6;
}


static u8 *ieee80211_wep_add_iv(struct ieee80211_local *local,
				struct sk_buff *skb,
				struct ieee80211_key *key)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	unsigned int hdrlen;
	u8 *newhdr;

	hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);

	if (WARN_ON(skb_tailroom(skb) < WEP_ICV_LEN ||
		    skb_headroom(skb) < WEP_IV_LEN))
		return NULL;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	newhdr = skb_push(skb, WEP_IV_LEN);
	memmove(newhdr, newhdr + WEP_IV_LEN, hdrlen);
	ieee80211_wep_get_iv(local, key, newhdr + hdrlen);
	return newhdr + hdrlen;
}


static void ieee80211_wep_remove_iv(struct ieee80211_local *local,
				    struct sk_buff *skb,
				    struct ieee80211_key *key)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	unsigned int hdrlen;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen);
	skb_pull(skb, WEP_IV_LEN);
}


/* Perform WEP encryption using given key. data buffer must have tailroom
 * for 4-byte ICV. data_len must not include this ICV. Note: this function
 * does _not_ add IV. data = RC4(data | CRC32(data)) */
void ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
				size_t klen, u8 *data, size_t data_len)
{
	struct blkcipher_desc desc = { .tfm = tfm };
	struct scatterlist sg;
	__le32 *icv;

	icv = (__le32 *)(data + data_len);
	*icv = cpu_to_le32(~crc32_le(~0, data, data_len));

	crypto_blkcipher_setkey(tfm, rc4key, klen);
	sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
	crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length);
}


/* Perform WEP encryption on given skb. 4 bytes of extra space (IV) in the
 * beginning of the buffer 4 bytes of extra space (ICV) in the end of the
 * buffer will be added. Both IV and ICV will be transmitted, so the
 * payload length increases with 8 bytes.
 *
 * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
 */
int ieee80211_wep_encrypt(struct ieee80211_local *local, struct sk_buff *skb,
			  struct ieee80211_key *key)
{
	u32 klen;
	u8 *rc4key, *iv;
	size_t len;

	if (!key || key->conf.alg != ALG_WEP)
		return -1;

	klen = 3 + key->conf.keylen;
	rc4key = kmalloc(klen, GFP_ATOMIC);
	if (!rc4key)
		return -1;

	iv = ieee80211_wep_add_iv(local, skb, key);
	if (!iv) {
		kfree(rc4key);
		return -1;
	}

	len = skb->len - (iv + WEP_IV_LEN - skb->data);

	/* Prepend 24-bit IV to RC4 key */
	memcpy(rc4key, iv, 3);

	/* Copy rest of the WEP key (the secret part) */
	memcpy(rc4key + 3, key->conf.key, key->conf.keylen);

	/* Add room for ICV */
	skb_put(skb, WEP_ICV_LEN);

	ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, klen,
				   iv + WEP_IV_LEN, len);

	kfree(rc4key);

	return 0;
}


/* Perform WEP decryption using given key. data buffer includes encrypted
 * payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV.
 * Return 0 on success and -1 on ICV mismatch. */
int ieee80211_wep_decrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
			       size_t klen, u8 *data, size_t data_len)
{
	struct blkcipher_desc desc = { .tfm = tfm };
	struct scatterlist sg;
	__le32 crc;

	crypto_blkcipher_setkey(tfm, rc4key, klen);
	sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
	crypto_blkcipher_decrypt(&desc, &sg, &sg, sg.length);

	crc = cpu_to_le32(~crc32_le(~0, data, data_len));
	if (memcmp(&crc, data + data_len, WEP_ICV_LEN) != 0)
		/* ICV mismatch */
		return -1;

	return 0;
}


/* Perform WEP decryption on given skb. Buffer includes whole WEP part of
 * the frame: IV (4 bytes), encrypted payload (including SNAP header),
 * ICV (4 bytes). skb->len includes both IV and ICV.
 *
 * Returns 0 if frame was decrypted successfully and ICV was correct and -1 on
 * failure. If frame is OK, IV and ICV will be removed, i.e., decrypted payload
 * is moved to the beginning of the skb and skb length will be reduced.
 */
int ieee80211_wep_decrypt(struct ieee80211_local *local, struct sk_buff *skb,
			  struct ieee80211_key *key)
{
	u32 klen;
	u8 *rc4key;
	u8 keyidx;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	unsigned int hdrlen;
	size_t len;
	int ret = 0;

	if (!ieee80211_has_protected(hdr->frame_control))
		return -1;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (skb->len < 8 + hdrlen)
		return -1;

	len = skb->len - hdrlen - 8;

	keyidx = skb->data[hdrlen + 3] >> 6;

	if (!key || keyidx != key->conf.keyidx || key->conf.alg != ALG_WEP)
		return -1;

	klen = 3 + key->conf.keylen;

	rc4key = kmalloc(klen, GFP_ATOMIC);
	if (!rc4key)
		return -1;

	/* Prepend 24-bit IV to RC4 key */
	memcpy(rc4key, skb->data + hdrlen, 3);

	/* Copy rest of the WEP key (the secret part) */
	memcpy(rc4key + 3, key->conf.key, key->conf.keylen);

	if (ieee80211_wep_decrypt_data(local->wep_rx_tfm, rc4key, klen,
				       skb->data + hdrlen + WEP_IV_LEN,
				       len))
		ret = -1;

	kfree(rc4key);

	/* Trim ICV */
	skb_trim(skb, skb->len - WEP_ICV_LEN);

	/* Remove IV */
	memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen);
	skb_pull(skb, WEP_IV_LEN);

	return ret;
}


u8 * ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	unsigned int hdrlen;
	u8 *ivpos;
	u32 iv;

	if (!ieee80211_has_protected(hdr->frame_control))
		return NULL;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	ivpos = skb->data + hdrlen;
	iv = (ivpos[0] << 16) | (ivpos[1] << 8) | ivpos[2];

	if (ieee80211_wep_weak_iv(iv, key->conf.keylen))
		return ivpos;

	return NULL;
}

ieee80211_rx_result
ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx)
{
	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
	    ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
	     (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))
		return RX_CONTINUE;

	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
		if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key))
			return RX_DROP_UNUSABLE;
	} else if (!(rx->status->flag & RX_FLAG_IV_STRIPPED)) {
		ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
		/* remove ICV */
		skb_trim(rx->skb, rx->skb->len - 4);
	}

	return RX_CONTINUE;
}

static int wep_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

	info->control.iv_len = WEP_IV_LEN;
	info->control.icv_len = WEP_ICV_LEN;

	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
		if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
			return -1;
	} else {
		info->control.hw_key = &tx->key->conf;
		if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
			if (!ieee80211_wep_add_iv(tx->local, skb, tx->key))
				return -1;
		}
	}
	return 0;
}

ieee80211_tx_result
ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx)
{
	ieee80211_tx_set_protected(tx);

	if (wep_encrypt_skb(tx, tx->skb) < 0) {
		I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
		return TX_DROP;
	}

	if (tx->extra_frag) {
		int i;
		for (i = 0; i < tx->num_extra_frag; i++) {
			if (wep_encrypt_skb(tx, tx->extra_frag[i]) < 0) {
				I802_DEBUG_INC(tx->local->
					       tx_handlers_drop_wep);
				return TX_DROP;
			}
		}
	}

	return TX_CONTINUE;
}
Commit	Line	Data
f0706e82 JB	1	/*
	2	* Software WEP encryption implementation
	3	* Copyright 2002, Jouni Malinen <jkmaline@cc.hut.fi>
	4	* Copyright 2003, Instant802 Networks, Inc.
	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.
	9	*/
	10
	11	#include <linux/netdevice.h>
	12	#include <linux/types.h>
	13	#include <linux/random.h>
	14	#include <linux/compiler.h>
	15	#include <linux/crc32.h>
	16	#include <linux/crypto.h>
	17	#include <linux/err.h>
	18	#include <linux/mm.h>
11763609	19	#include <linux/scatterlist.h>
f0706e82 JB	20
	21	#include <net/mac80211.h>
	22	#include "ieee80211_i.h"
	23	#include "wep.h"
	24
	25
	26	int ieee80211_wep_init(struct ieee80211_local *local)
	27	{
	28	/* start WEP IV from a random value */
	29	get_random_bytes(&local->wep_iv, WEP_IV_LEN);
	30
	31	local->wep_tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
	32	CRYPTO_ALG_ASYNC);
	33	if (IS_ERR(local->wep_tx_tfm))
	34	return -ENOMEM;
	35
	36	local->wep_rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
	37	CRYPTO_ALG_ASYNC);
	38	if (IS_ERR(local->wep_rx_tfm)) {
	39	crypto_free_blkcipher(local->wep_tx_tfm);
	40	return -ENOMEM;
	41	}
	42
	43	return 0;
	44	}
	45
	46	void ieee80211_wep_free(struct ieee80211_local *local)
	47	{
	48	crypto_free_blkcipher(local->wep_tx_tfm);
	49	crypto_free_blkcipher(local->wep_rx_tfm);
	50	}
	51
	52	static inline int ieee80211_wep_weak_iv(u32 iv, int keylen)
	53	{
	54	/* Fluhrer, Mantin, and Shamir have reported weaknesses in the
	55	* key scheduling algorithm of RC4. At least IVs (KeyByte + 3,
	56	* 0xff, N) can be used to speedup attacks, so avoid using them. */
	57	if ((iv & 0xff00) == 0xff00) {
	58	u8 B = (iv >> 16) & 0xff;
	59	if (B >= 3 && B < 3 + keylen)
	60	return 1;
	61	}
	62	return 0;
	63	}
	64
	65
4f0d18e2 JB	66	static void ieee80211_wep_get_iv(struct ieee80211_local *local,
4f0d18e2 JB	67	struct ieee80211_key key, u8 iv)
f0706e82 JB	68	{
f0706e82 JB	69	local->wep_iv++;
8f20fc24	70	if (ieee80211_wep_weak_iv(local->wep_iv, key->conf.keylen))
f0706e82 JB	71	local->wep_iv += 0x0100;
	72
	73	if (!iv)
	74	return;
	75
	76	*iv++ = (local->wep_iv >> 16) & 0xff;
	77	*iv++ = (local->wep_iv >> 8) & 0xff;
	78	*iv++ = local->wep_iv & 0xff;
8f20fc24	79	*iv++ = key->conf.keyidx << 6;
f0706e82 JB	80	}
	81
	82
6a22a59d JB	83	static u8 ieee80211_wep_add_iv(struct ieee80211_local local,
	84	struct sk_buff *skb,
	85	struct ieee80211_key *key)
f0706e82	86	{
70217d7f HH	87	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	88	unsigned int hdrlen;
f0706e82 JB	89	u8 *newhdr;
f0706e82 JB	90
70217d7f	91	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
f0706e82	92
23c0752a JB	93	if (WARN_ON(skb_tailroom(skb) < WEP_ICV_LEN \|\|
	94	skb_headroom(skb) < WEP_IV_LEN))
	95	return NULL;
f0706e82	96
70217d7f	97	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	98	newhdr = skb_push(skb, WEP_IV_LEN);
	99	memmove(newhdr, newhdr + WEP_IV_LEN, hdrlen);
	100	ieee80211_wep_get_iv(local, key, newhdr + hdrlen);
	101	return newhdr + hdrlen;
	102	}
	103
	104
4f0d18e2 JB	105	static void ieee80211_wep_remove_iv(struct ieee80211_local *local,
	106	struct sk_buff *skb,
	107	struct ieee80211_key *key)
f0706e82	108	{
70217d7f HH	109	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	110	unsigned int hdrlen;
f0706e82	111
70217d7f	112	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	113	memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen);
	114	skb_pull(skb, WEP_IV_LEN);
	115	}
	116
	117
	118	/* Perform WEP encryption using given key. data buffer must have tailroom
	119	* for 4-byte ICV. data_len must not include this ICV. Note: this function
	120	* does _not_ add IV. data = RC4(data \| CRC32(data)) */
	121	void ieee80211_wep_encrypt_data(struct crypto_blkcipher tfm, u8 rc4key,
	122	size_t klen, u8 *data, size_t data_len)
	123	{
	124	struct blkcipher_desc desc = { .tfm = tfm };
	125	struct scatterlist sg;
	126	__le32 *icv;
	127
	128	icv = (__le32 *)(data + data_len);
	129	*icv = cpu_to_le32(~crc32_le(~0, data, data_len));
	130
	131	crypto_blkcipher_setkey(tfm, rc4key, klen);
fa05f128	132	sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
f0706e82 JB	133	crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length);
	134	}
	135
	136
	137	/* Perform WEP encryption on given skb. 4 bytes of extra space (IV) in the
	138	* beginning of the buffer 4 bytes of extra space (ICV) in the end of the
	139	* buffer will be added. Both IV and ICV will be transmitted, so the
	140	* payload length increases with 8 bytes.
	141	*
	142	* WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
	143	*/
	144	int ieee80211_wep_encrypt(struct ieee80211_local local, struct sk_buff skb,
	145	struct ieee80211_key *key)
	146	{
	147	u32 klen;
	148	u8 rc4key, iv;
	149	size_t len;
	150
8f20fc24	151	if (!key \|\| key->conf.alg != ALG_WEP)
f0706e82 JB	152	return -1;
f0706e82 JB	153
8f20fc24	154	klen = 3 + key->conf.keylen;
f0706e82 JB	155	rc4key = kmalloc(klen, GFP_ATOMIC);
	156	if (!rc4key)
	157	return -1;
	158
	159	iv = ieee80211_wep_add_iv(local, skb, key);
	160	if (!iv) {
	161	kfree(rc4key);
	162	return -1;
	163	}
	164
	165	len = skb->len - (iv + WEP_IV_LEN - skb->data);
	166
	167	/* Prepend 24-bit IV to RC4 key */
	168	memcpy(rc4key, iv, 3);
	169
	170	/* Copy rest of the WEP key (the secret part) */
8f20fc24	171	memcpy(rc4key + 3, key->conf.key, key->conf.keylen);
f0706e82 JB	172
	173	/* Add room for ICV */
	174	skb_put(skb, WEP_ICV_LEN);
	175
	176	ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, klen,
	177	iv + WEP_IV_LEN, len);
	178
	179	kfree(rc4key);
	180
	181	return 0;
	182	}
	183
	184
	185	/* Perform WEP decryption using given key. data buffer includes encrypted
	186	* payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV.
	187	* Return 0 on success and -1 on ICV mismatch. */
	188	int ieee80211_wep_decrypt_data(struct crypto_blkcipher tfm, u8 rc4key,
	189	size_t klen, u8 *data, size_t data_len)
	190	{
	191	struct blkcipher_desc desc = { .tfm = tfm };
	192	struct scatterlist sg;
	193	__le32 crc;
	194
	195	crypto_blkcipher_setkey(tfm, rc4key, klen);
fa05f128	196	sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
f0706e82 JB	197	crypto_blkcipher_decrypt(&desc, &sg, &sg, sg.length);
	198
	199	crc = cpu_to_le32(~crc32_le(~0, data, data_len));
	200	if (memcmp(&crc, data + data_len, WEP_ICV_LEN) != 0)
	201	/* ICV mismatch */
	202	return -1;
	203
	204	return 0;
	205	}
	206
	207
	208	/* Perform WEP decryption on given skb. Buffer includes whole WEP part of
	209	* the frame: IV (4 bytes), encrypted payload (including SNAP header),
	210	* ICV (4 bytes). skb->len includes both IV and ICV.
	211	*
	212	* Returns 0 if frame was decrypted successfully and ICV was correct and -1 on
	213	* failure. If frame is OK, IV and ICV will be removed, i.e., decrypted payload
	214	* is moved to the beginning of the skb and skb length will be reduced.
	215	*/
	216	int ieee80211_wep_decrypt(struct ieee80211_local local, struct sk_buff skb,
	217	struct ieee80211_key *key)
	218	{
	219	u32 klen;
	220	u8 *rc4key;
	221	u8 keyidx;
70217d7f HH	222	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	223	unsigned int hdrlen;
f0706e82 JB	224	size_t len;
	225	int ret = 0;
	226
70217d7f	227	if (!ieee80211_has_protected(hdr->frame_control))
f0706e82 JB	228	return -1;
f0706e82 JB	229
70217d7f	230	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	231
	232	if (skb->len < 8 + hdrlen)
	233	return -1;
	234
	235	len = skb->len - hdrlen - 8;
	236
	237	keyidx = skb->data[hdrlen + 3] >> 6;
	238
8f20fc24	239	if (!key \|\| keyidx != key->conf.keyidx \|\| key->conf.alg != ALG_WEP)
f0706e82 JB	240	return -1;
f0706e82 JB	241
8f20fc24	242	klen = 3 + key->conf.keylen;
f0706e82 JB	243
	244	rc4key = kmalloc(klen, GFP_ATOMIC);
	245	if (!rc4key)
	246	return -1;
	247
	248	/* Prepend 24-bit IV to RC4 key */
	249	memcpy(rc4key, skb->data + hdrlen, 3);
	250
	251	/* Copy rest of the WEP key (the secret part) */
8f20fc24	252	memcpy(rc4key + 3, key->conf.key, key->conf.keylen);
f0706e82 JB	253
	254	if (ieee80211_wep_decrypt_data(local->wep_rx_tfm, rc4key, klen,
	255	skb->data + hdrlen + WEP_IV_LEN,
f4ea83dd	256	len))
f0706e82	257	ret = -1;
f0706e82 JB	258
	259	kfree(rc4key);
	260
	261	/* Trim ICV */
	262	skb_trim(skb, skb->len - WEP_ICV_LEN);
	263
	264	/* Remove IV */
	265	memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen);
	266	skb_pull(skb, WEP_IV_LEN);
	267
	268	return ret;
	269	}
	270
	271
f0706e82 JB	272	u8 * ieee80211_wep_is_weak_iv(struct sk_buff skb, struct ieee80211_key key)
f0706e82 JB	273	{
70217d7f HH	274	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	275	unsigned int hdrlen;
f0706e82 JB	276	u8 *ivpos;
	277	u32 iv;
	278
70217d7f	279	if (!ieee80211_has_protected(hdr->frame_control))
f0706e82 JB	280	return NULL;
f0706e82 JB	281
70217d7f	282	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	283	ivpos = skb->data + hdrlen;
	284	iv = (ivpos[0] << 16) \| (ivpos[1] << 8) \| ivpos[2];
	285
8f20fc24	286	if (ieee80211_wep_weak_iv(iv, key->conf.keylen))
f0706e82 JB	287	return ivpos;
	288
	289	return NULL;
	290	}
4f0d18e2	291
9ae54c84	292	ieee80211_rx_result
5cf121c3	293	ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx)
4f0d18e2 JB	294	{
	295	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
	296	((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT \|\|
	297	(rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))
9ae54c84	298	return RX_CONTINUE;
4f0d18e2	299
5cf121c3	300	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
f4ea83dd	301	if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key))
e4c26add	302	return RX_DROP_UNUSABLE;
5cf121c3	303	} else if (!(rx->status->flag & RX_FLAG_IV_STRIPPED)) {
4f0d18e2 JB	304	ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
	305	/* remove ICV */
	306	skb_trim(rx->skb, rx->skb->len - 4);
	307	}
	308
9ae54c84	309	return RX_CONTINUE;
4f0d18e2	310	}
6a22a59d	311
5cf121c3	312	static int wep_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
6a22a59d	313	{
e039fa4a JB	314	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	315
	316	info->control.iv_len = WEP_IV_LEN;
	317	info->control.icv_len = WEP_ICV_LEN;
	318
6a22a59d JB	319	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
	320	if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
	321	return -1;
	322	} else {
2b212141	323	info->control.hw_key = &tx->key->conf;
6a22a59d JB	324	if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
	325	if (!ieee80211_wep_add_iv(tx->local, skb, tx->key))
	326	return -1;
	327	}
	328	}
	329	return 0;
	330	}
	331
9ae54c84	332	ieee80211_tx_result
5cf121c3	333	ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx)
6a22a59d	334	{
5cf121c3	335	ieee80211_tx_set_protected(tx);
6a22a59d JB	336
	337	if (wep_encrypt_skb(tx, tx->skb) < 0) {
	338	I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
9ae54c84	339	return TX_DROP;
6a22a59d JB	340	}
6a22a59d JB	341
5cf121c3	342	if (tx->extra_frag) {
6a22a59d	343	int i;
5cf121c3 JB	344	for (i = 0; i < tx->num_extra_frag; i++) {
5cf121c3 JB	345	if (wep_encrypt_skb(tx, tx->extra_frag[i]) < 0) {
6a22a59d JB	346	I802_DEBUG_INC(tx->local->
6a22a59d JB	347	tx_handlers_drop_wep);
9ae54c84	348	return TX_DROP;
6a22a59d JB	349	}
	350	}
	351	}
	352
9ae54c84	353	return TX_CONTINUE;
6a22a59d	354	}