[linux.git] / net / mac80211 / wep.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Software WEP encryption implementation
 * Copyright 2002, Jouni Malinen <[email protected]>
 * Copyright 2003, Instant802 Networks, Inc.
 */

#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 <linux/slab.h>
#include <asm/unaligned.h>

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


void ieee80211_wep_init(struct ieee80211_local *local)
{
	/* start WEP IV from a random value */
	get_random_bytes(&local->wep_iv, IEEE80211_WEP_IV_LEN);
}

static inline bool 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 true;
	}
	return false;
}


static void ieee80211_wep_get_iv(struct ieee80211_local *local,
				 int keylen, int keyidx, u8 *iv)
{
	local->wep_iv++;
	if (ieee80211_wep_weak_iv(local->wep_iv, 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++ = keyidx << 6;
}


static u8 *ieee80211_wep_add_iv(struct ieee80211_local *local,
				struct sk_buff *skb,
				int keylen, int keyidx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	unsigned int hdrlen;
	u8 *newhdr;

	hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);

	if (WARN_ON(skb_headroom(skb) < IEEE80211_WEP_IV_LEN))
		return NULL;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	newhdr = skb_push(skb, IEEE80211_WEP_IV_LEN);
	memmove(newhdr, newhdr + IEEE80211_WEP_IV_LEN, hdrlen);

	/* the HW only needs room for the IV, but not the actual IV */
	if (info->control.hw_key &&
	    (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
		return newhdr + hdrlen;

	ieee80211_wep_get_iv(local, keylen, keyidx, 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 + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
	skb_pull(skb, IEEE80211_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)) */
int ieee80211_wep_encrypt_data(struct arc4_ctx *ctx, u8 *rc4key,
			       size_t klen, u8 *data, size_t data_len)
{
	__le32 icv;

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

	arc4_setkey(ctx, rc4key, klen);
	arc4_crypt(ctx, data, data, data_len + IEEE80211_WEP_ICV_LEN);
	memzero_explicit(ctx, sizeof(*ctx));

	return 0;
}


/* 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,
			  const u8 *key, int keylen, int keyidx)
{
	u8 *iv;
	size_t len;
	u8 rc4key[3 + WLAN_KEY_LEN_WEP104];

	if (WARN_ON(skb_tailroom(skb) < IEEE80211_WEP_ICV_LEN))
		return -1;

	iv = ieee80211_wep_add_iv(local, skb, keylen, keyidx);
	if (!iv)
		return -1;

	len = skb->len - (iv + IEEE80211_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, keylen);

	/* Add room for ICV */
	skb_put(skb, IEEE80211_WEP_ICV_LEN);

	return ieee80211_wep_encrypt_data(&local->wep_tx_ctx, rc4key, keylen + 3,
					  iv + IEEE80211_WEP_IV_LEN, len);
}


/* 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 arc4_ctx *ctx, u8 *rc4key,
			       size_t klen, u8 *data, size_t data_len)
{
	__le32 crc;

	arc4_setkey(ctx, rc4key, klen);
	arc4_crypt(ctx, data, data, data_len + IEEE80211_WEP_ICV_LEN);
	memzero_explicit(ctx, sizeof(*ctx));

	crc = cpu_to_le32(~crc32_le(~0, data, data_len));
	if (memcmp(&crc, data + data_len, IEEE80211_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.
 */
static int ieee80211_wep_decrypt(struct ieee80211_local *local,
				 struct sk_buff *skb,
				 struct ieee80211_key *key)
{
	u32 klen;
	u8 rc4key[3 + WLAN_KEY_LEN_WEP104];
	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 < hdrlen + IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN)
		return -1;

	len = skb->len - hdrlen - IEEE80211_WEP_IV_LEN - IEEE80211_WEP_ICV_LEN;

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

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

	klen = 3 + key->conf.keylen;

	/* 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_ctx, rc4key, klen,
				       skb->data + hdrlen +
				       IEEE80211_WEP_IV_LEN, len))
		ret = -1;

	/* Trim ICV */
	skb_trim(skb, skb->len - IEEE80211_WEP_ICV_LEN);

	/* Remove IV */
	memmove(skb->data + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
	skb_pull(skb, IEEE80211_WEP_IV_LEN);

	return ret;
}

ieee80211_rx_result
ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx)
{
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;

	if (!ieee80211_is_data(fc) && !ieee80211_is_auth(fc))
		return RX_CONTINUE;

	if (!(status->flag & RX_FLAG_DECRYPTED)) {
		if (skb_linearize(rx->skb))
			return RX_DROP_UNUSABLE;
		if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key))
			return RX_DROP_UNUSABLE;
	} else if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
		if (!pskb_may_pull(rx->skb, ieee80211_hdrlen(fc) +
					    IEEE80211_WEP_IV_LEN))
			return RX_DROP_UNUSABLE;
		ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
		/* remove ICV */
		if (!(status->flag & RX_FLAG_ICV_STRIPPED) &&
		    pskb_trim(rx->skb, rx->skb->len - IEEE80211_WEP_ICV_LEN))
			return RX_DROP_UNUSABLE;
	}

	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);
	struct ieee80211_key_conf *hw_key = info->control.hw_key;

	if (!hw_key) {
		if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key,
					  tx->key->conf.keylen,
					  tx->key->conf.keyidx))
			return -1;
	} else if ((hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
		   (hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
		if (!ieee80211_wep_add_iv(tx->local, skb,
					  tx->key->conf.keylen,
					  tx->key->conf.keyidx))
			return -1;
	}

	return 0;
}

ieee80211_tx_result
ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb;

	ieee80211_tx_set_protected(tx);

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

	return TX_CONTINUE;
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
f0706e82 JB	2	/*
	3	* Software WEP encryption implementation
	4	* Copyright 2002, Jouni Malinen <[email protected]>
	5	* Copyright 2003, Instant802 Networks, Inc.
f0706e82 JB	6	*/
	7
	8	#include <linux/netdevice.h>
	9	#include <linux/types.h>
	10	#include <linux/random.h>
	11	#include <linux/compiler.h>
	12	#include <linux/crc32.h>
	13	#include <linux/crypto.h>
	14	#include <linux/err.h>
	15	#include <linux/mm.h>
11763609	16	#include <linux/scatterlist.h>
5a0e3ad6	17	#include <linux/slab.h>
860c6e6a	18	#include <asm/unaligned.h>
f0706e82 JB	19
	20	#include <net/mac80211.h>
	21	#include "ieee80211_i.h"
	22	#include "wep.h"
	23
	24
4a65cc24	25	void ieee80211_wep_init(struct ieee80211_local *local)
f0706e82 JB	26	{
f0706e82 JB	27	/* start WEP IV from a random value */
4325f6ca	28	get_random_bytes(&local->wep_iv, IEEE80211_WEP_IV_LEN);
f0706e82 JB	29	}
f0706e82 JB	30
c6a1fa12	31	static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen)
f0706e82	32	{
c6a1fa12 JB	33	/*
c6a1fa12 JB	34	* Fluhrer, Mantin, and Shamir have reported weaknesses in the
f0706e82	35	* key scheduling algorithm of RC4. At least IVs (KeyByte + 3,
c6a1fa12 JB	36	* 0xff, N) can be used to speedup attacks, so avoid using them.
c6a1fa12 JB	37	*/
f0706e82 JB	38	if ((iv & 0xff00) == 0xff00) {
	39	u8 B = (iv >> 16) & 0xff;
	40	if (B >= 3 && B < 3 + keylen)
c6a1fa12	41	return true;
f0706e82	42	}
c6a1fa12	43	return false;
f0706e82 JB	44	}
	45
	46
4f0d18e2	47	static void ieee80211_wep_get_iv(struct ieee80211_local *local,
c9cf0122	48	int keylen, int keyidx, u8 *iv)
f0706e82 JB	49	{
f0706e82 JB	50	local->wep_iv++;
c9cf0122	51	if (ieee80211_wep_weak_iv(local->wep_iv, keylen))
f0706e82 JB	52	local->wep_iv += 0x0100;
	53
	54	if (!iv)
	55	return;
	56
	57	*iv++ = (local->wep_iv >> 16) & 0xff;
	58	*iv++ = (local->wep_iv >> 8) & 0xff;
	59	*iv++ = local->wep_iv & 0xff;
c9cf0122	60	*iv++ = keyidx << 6;
f0706e82 JB	61	}
	62
	63
6a22a59d JB	64	static u8 ieee80211_wep_add_iv(struct ieee80211_local local,
6a22a59d JB	65	struct sk_buff *skb,
c9cf0122	66	int keylen, int keyidx)
f0706e82	67	{
70217d7f	68	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
ee70108f	69	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
70217d7f	70	unsigned int hdrlen;
f0706e82 JB	71	u8 *newhdr;
f0706e82 JB	72
70217d7f	73	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
f0706e82	74
47b4e1fc	75	if (WARN_ON(skb_headroom(skb) < IEEE80211_WEP_IV_LEN))
23c0752a	76	return NULL;
f0706e82	77
70217d7f	78	hdrlen = ieee80211_hdrlen(hdr->frame_control);
4325f6ca JB	79	newhdr = skb_push(skb, IEEE80211_WEP_IV_LEN);
4325f6ca JB	80	memmove(newhdr, newhdr + IEEE80211_WEP_IV_LEN, hdrlen);
ee70108f JD	81
	82	/* the HW only needs room for the IV, but not the actual IV */
	83	if (info->control.hw_key &&
	84	(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
	85	return newhdr + hdrlen;
	86
c9cf0122	87	ieee80211_wep_get_iv(local, keylen, keyidx, newhdr + hdrlen);
f0706e82 JB	88	return newhdr + hdrlen;
	89	}
	90
	91
4f0d18e2 JB	92	static void ieee80211_wep_remove_iv(struct ieee80211_local *local,
	93	struct sk_buff *skb,
	94	struct ieee80211_key *key)
f0706e82	95	{
70217d7f HH	96	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	97	unsigned int hdrlen;
f0706e82	98
70217d7f	99	hdrlen = ieee80211_hdrlen(hdr->frame_control);
4325f6ca JB	100	memmove(skb->data + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
4325f6ca JB	101	skb_pull(skb, IEEE80211_WEP_IV_LEN);
f0706e82 JB	102	}
	103
	104
	105	/* Perform WEP encryption using given key. data buffer must have tailroom
	106	* for 4-byte ICV. data_len must not include this ICV. Note: this function
	107	* does _not_ add IV. data = RC4(data \| CRC32(data)) */
5fdb3735	108	int ieee80211_wep_encrypt_data(struct arc4_ctx ctx, u8 rc4key,
3473187d	109	size_t klen, u8 *data, size_t data_len)
f0706e82	110	{
860c6e6a	111	__le32 icv;
3473187d	112
860c6e6a IK	113	icv = cpu_to_le32(~crc32_le(~0, data, data_len));
860c6e6a IK	114	put_unaligned(icv, (__le32 *)(data + data_len));
f0706e82	115
5fdb3735 AB	116	arc4_setkey(ctx, rc4key, klen);
	117	arc4_crypt(ctx, data, data, data_len + IEEE80211_WEP_ICV_LEN);
	118	memzero_explicit(ctx, sizeof(*ctx));
3473187d JL	119
3473187d JL	120	return 0;
f0706e82 JB	121	}
	122
	123
	124	/* Perform WEP encryption on given skb. 4 bytes of extra space (IV) in the
	125	* beginning of the buffer 4 bytes of extra space (ICV) in the end of the
	126	* buffer will be added. Both IV and ICV will be transmitted, so the
	127	* payload length increases with 8 bytes.
	128	*
	129	* WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
	130	*/
fffd0934 JB	131	int ieee80211_wep_encrypt(struct ieee80211_local *local,
	132	struct sk_buff *skb,
	133	const u8 *key, int keylen, int keyidx)
f0706e82	134	{
c9cf0122	135	u8 *iv;
f0706e82	136	size_t len;
c9cf0122	137	u8 rc4key[3 + WLAN_KEY_LEN_WEP104];
f0706e82	138
47b4e1fc JD	139	if (WARN_ON(skb_tailroom(skb) < IEEE80211_WEP_ICV_LEN))
	140	return -1;
	141
c9cf0122 JB	142	iv = ieee80211_wep_add_iv(local, skb, keylen, keyidx);
c9cf0122 JB	143	if (!iv)
f0706e82	144	return -1;
f0706e82	145
4325f6ca	146	len = skb->len - (iv + IEEE80211_WEP_IV_LEN - skb->data);
f0706e82 JB	147
	148	/* Prepend 24-bit IV to RC4 key */
	149	memcpy(rc4key, iv, 3);
	150
	151	/* Copy rest of the WEP key (the secret part) */
c9cf0122	152	memcpy(rc4key + 3, key, keylen);
f0706e82 JB	153
f0706e82 JB	154	/* Add room for ICV */
4325f6ca	155	skb_put(skb, IEEE80211_WEP_ICV_LEN);
f0706e82	156
5fdb3735	157	return ieee80211_wep_encrypt_data(&local->wep_tx_ctx, rc4key, keylen + 3,
4325f6ca	158	iv + IEEE80211_WEP_IV_LEN, len);
f0706e82 JB	159	}
	160
	161
	162	/* Perform WEP decryption using given key. data buffer includes encrypted
	163	* payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV.
	164	* Return 0 on success and -1 on ICV mismatch. */
5fdb3735	165	int ieee80211_wep_decrypt_data(struct arc4_ctx ctx, u8 rc4key,
f0706e82 JB	166	size_t klen, u8 *data, size_t data_len)
f0706e82 JB	167	{
f0706e82	168	__le32 crc;
3473187d	169
5fdb3735 AB	170	arc4_setkey(ctx, rc4key, klen);
	171	arc4_crypt(ctx, data, data, data_len + IEEE80211_WEP_ICV_LEN);
	172	memzero_explicit(ctx, sizeof(*ctx));
f0706e82 JB	173
f0706e82 JB	174	crc = cpu_to_le32(~crc32_le(~0, data, data_len));
4325f6ca	175	if (memcmp(&crc, data + data_len, IEEE80211_WEP_ICV_LEN) != 0)
f0706e82 JB	176	/* ICV mismatch */
	177	return -1;
	178
	179	return 0;
	180	}
	181
	182
	183	/* Perform WEP decryption on given skb. Buffer includes whole WEP part of
	184	* the frame: IV (4 bytes), encrypted payload (including SNAP header),
	185	* ICV (4 bytes). skb->len includes both IV and ICV.
	186	*
	187	* Returns 0 if frame was decrypted successfully and ICV was correct and -1 on
	188	* failure. If frame is OK, IV and ICV will be removed, i.e., decrypted payload
	189	* is moved to the beginning of the skb and skb length will be reduced.
	190	*/
c9cf0122 JB	191	static int ieee80211_wep_decrypt(struct ieee80211_local *local,
	192	struct sk_buff *skb,
	193	struct ieee80211_key *key)
f0706e82 JB	194	{
f0706e82 JB	195	u32 klen;
730bd83b	196	u8 rc4key[3 + WLAN_KEY_LEN_WEP104];
f0706e82	197	u8 keyidx;
70217d7f HH	198	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	199	unsigned int hdrlen;
f0706e82 JB	200	size_t len;
	201	int ret = 0;
	202
70217d7f	203	if (!ieee80211_has_protected(hdr->frame_control))
f0706e82 JB	204	return -1;
f0706e82 JB	205
70217d7f	206	hdrlen = ieee80211_hdrlen(hdr->frame_control);
4325f6ca	207	if (skb->len < hdrlen + IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN)
f0706e82 JB	208	return -1;
f0706e82 JB	209
4325f6ca	210	len = skb->len - hdrlen - IEEE80211_WEP_IV_LEN - IEEE80211_WEP_ICV_LEN;
f0706e82 JB	211
	212	keyidx = skb->data[hdrlen + 3] >> 6;
	213
97359d12	214	if (!key \|\| keyidx != key->conf.keyidx)
f0706e82 JB	215	return -1;
f0706e82 JB	216
8f20fc24	217	klen = 3 + key->conf.keylen;
f0706e82	218
f0706e82 JB	219	/* Prepend 24-bit IV to RC4 key */
	220	memcpy(rc4key, skb->data + hdrlen, 3);
	221
	222	/* Copy rest of the WEP key (the secret part) */
8f20fc24	223	memcpy(rc4key + 3, key->conf.key, key->conf.keylen);
f0706e82	224
5fdb3735	225	if (ieee80211_wep_decrypt_data(&local->wep_rx_ctx, rc4key, klen,
4325f6ca JB	226	skb->data + hdrlen +
4325f6ca JB	227	IEEE80211_WEP_IV_LEN, len))
f0706e82	228	ret = -1;
f0706e82	229
f0706e82	230	/* Trim ICV */
4325f6ca	231	skb_trim(skb, skb->len - IEEE80211_WEP_ICV_LEN);
f0706e82 JB	232
f0706e82 JB	233	/* Remove IV */
4325f6ca JB	234	memmove(skb->data + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
4325f6ca JB	235	skb_pull(skb, IEEE80211_WEP_IV_LEN);
f0706e82 JB	236
	237	return ret;
	238	}
	239
9ae54c84	240	ieee80211_rx_result
5cf121c3	241	ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx)
4f0d18e2	242	{
eb9fb5b8 JB	243	struct sk_buff *skb = rx->skb;
	244	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	245	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
a8286911	246	__le16 fc = hdr->frame_control;
358c8d9d	247
a8286911	248	if (!ieee80211_is_data(fc) && !ieee80211_is_auth(fc))
9ae54c84	249	return RX_CONTINUE;
4f0d18e2	250
eb9fb5b8	251	if (!(status->flag & RX_FLAG_DECRYPTED)) {
a8286911 JB	252	if (skb_linearize(rx->skb))
a8286911 JB	253	return RX_DROP_UNUSABLE;
f4ea83dd	254	if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key))
e4c26add	255	return RX_DROP_UNUSABLE;
eb9fb5b8	256	} else if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
4325f6ca JB	257	if (!pskb_may_pull(rx->skb, ieee80211_hdrlen(fc) +
4325f6ca JB	258	IEEE80211_WEP_IV_LEN))
a8286911	259	return RX_DROP_UNUSABLE;
4f0d18e2 JB	260	ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
4f0d18e2 JB	261	/* remove ICV */
cef0acd4 DS	262	if (!(status->flag & RX_FLAG_ICV_STRIPPED) &&
cef0acd4 DS	263	pskb_trim(rx->skb, rx->skb->len - IEEE80211_WEP_ICV_LEN))
a8286911	264	return RX_DROP_UNUSABLE;
4f0d18e2 JB	265	}
4f0d18e2 JB	266
9ae54c84	267	return RX_CONTINUE;
4f0d18e2	268	}
6a22a59d	269
5cf121c3	270	static int wep_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
6a22a59d	271	{
e039fa4a	272	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
ee70108f	273	struct ieee80211_key_conf *hw_key = info->control.hw_key;
e039fa4a	274
ee70108f	275	if (!hw_key) {
c9cf0122 JB	276	if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key,
	277	tx->key->conf.keylen,
	278	tx->key->conf.keyidx))
6a22a59d	279	return -1;
ee70108f JD	280	} else if ((hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) \|\|
ee70108f JD	281	(hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
813d7669 JB	282	if (!ieee80211_wep_add_iv(tx->local, skb,
	283	tx->key->conf.keylen,
	284	tx->key->conf.keyidx))
	285	return -1;
	286	}
	287
6a22a59d JB	288	return 0;
	289	}
	290
9ae54c84	291	ieee80211_tx_result
5cf121c3	292	ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx)
6a22a59d	293	{
2de8e0d9	294	struct sk_buff *skb;
c6a1fa12	295
5cf121c3	296	ieee80211_tx_set_protected(tx);
6a22a59d	297
252b86c4	298	skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 JB	299	if (wep_encrypt_skb(tx, skb) < 0) {
	300	I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
	301	return TX_DROP;
6a22a59d	302	}
252b86c4	303	}
6a22a59d	304
9ae54c84	305	return TX_CONTINUE;
6a22a59d	306	}