[mirror_ubuntu-focal-kernel.git] / net / mac80211 / wep.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Software WEP encryption implementation
 * Copyright 2002, Jouni Malinen <jkmaline@cc.hut.fi>
 * 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"


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

	return 0;
}

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 <jkmaline@cc.hut.fi>
	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
	25	int ieee80211_wep_init(struct ieee80211_local *local)
	26	{
	27	/* start WEP IV from a random value */
4325f6ca	28	get_random_bytes(&local->wep_iv, IEEE80211_WEP_IV_LEN);
f0706e82	29
f0706e82 JB	30	return 0;
	31	}
	32
c6a1fa12	33	static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen)
f0706e82	34	{
c6a1fa12 JB	35	/*
c6a1fa12 JB	36	* Fluhrer, Mantin, and Shamir have reported weaknesses in the
f0706e82	37	* key scheduling algorithm of RC4. At least IVs (KeyByte + 3,
c6a1fa12 JB	38	* 0xff, N) can be used to speedup attacks, so avoid using them.
c6a1fa12 JB	39	*/
f0706e82 JB	40	if ((iv & 0xff00) == 0xff00) {
	41	u8 B = (iv >> 16) & 0xff;
	42	if (B >= 3 && B < 3 + keylen)
c6a1fa12	43	return true;
f0706e82	44	}
c6a1fa12	45	return false;
f0706e82 JB	46	}
	47
	48
4f0d18e2	49	static void ieee80211_wep_get_iv(struct ieee80211_local *local,
c9cf0122	50	int keylen, int keyidx, u8 *iv)
f0706e82 JB	51	{
f0706e82 JB	52	local->wep_iv++;
c9cf0122	53	if (ieee80211_wep_weak_iv(local->wep_iv, keylen))
f0706e82 JB	54	local->wep_iv += 0x0100;
	55
	56	if (!iv)
	57	return;
	58
	59	*iv++ = (local->wep_iv >> 16) & 0xff;
	60	*iv++ = (local->wep_iv >> 8) & 0xff;
	61	*iv++ = local->wep_iv & 0xff;
c9cf0122	62	*iv++ = keyidx << 6;
f0706e82 JB	63	}
	64
	65
6a22a59d JB	66	static u8 ieee80211_wep_add_iv(struct ieee80211_local local,
6a22a59d JB	67	struct sk_buff *skb,
c9cf0122	68	int keylen, int keyidx)
f0706e82	69	{
70217d7f	70	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
ee70108f	71	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
70217d7f	72	unsigned int hdrlen;
f0706e82 JB	73	u8 *newhdr;
f0706e82 JB	74
70217d7f	75	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
f0706e82	76
47b4e1fc	77	if (WARN_ON(skb_headroom(skb) < IEEE80211_WEP_IV_LEN))
23c0752a	78	return NULL;
f0706e82	79
70217d7f	80	hdrlen = ieee80211_hdrlen(hdr->frame_control);
4325f6ca JB	81	newhdr = skb_push(skb, IEEE80211_WEP_IV_LEN);
4325f6ca JB	82	memmove(newhdr, newhdr + IEEE80211_WEP_IV_LEN, hdrlen);
ee70108f JD	83
	84	/* the HW only needs room for the IV, but not the actual IV */
	85	if (info->control.hw_key &&
	86	(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
	87	return newhdr + hdrlen;
	88
c9cf0122	89	ieee80211_wep_get_iv(local, keylen, keyidx, newhdr + hdrlen);
f0706e82 JB	90	return newhdr + hdrlen;
	91	}
	92
	93
4f0d18e2 JB	94	static void ieee80211_wep_remove_iv(struct ieee80211_local *local,
	95	struct sk_buff *skb,
	96	struct ieee80211_key *key)
f0706e82	97	{
70217d7f HH	98	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	99	unsigned int hdrlen;
f0706e82	100
70217d7f	101	hdrlen = ieee80211_hdrlen(hdr->frame_control);
4325f6ca JB	102	memmove(skb->data + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
4325f6ca JB	103	skb_pull(skb, IEEE80211_WEP_IV_LEN);
f0706e82 JB	104	}
	105
	106
	107	/* Perform WEP encryption using given key. data buffer must have tailroom
	108	* for 4-byte ICV. data_len must not include this ICV. Note: this function
	109	* does _not_ add IV. data = RC4(data \| CRC32(data)) */
5fdb3735	110	int ieee80211_wep_encrypt_data(struct arc4_ctx ctx, u8 rc4key,
3473187d	111	size_t klen, u8 *data, size_t data_len)
f0706e82	112	{
860c6e6a	113	__le32 icv;
3473187d	114
860c6e6a IK	115	icv = cpu_to_le32(~crc32_le(~0, data, data_len));
860c6e6a IK	116	put_unaligned(icv, (__le32 *)(data + data_len));
f0706e82	117
5fdb3735 AB	118	arc4_setkey(ctx, rc4key, klen);
	119	arc4_crypt(ctx, data, data, data_len + IEEE80211_WEP_ICV_LEN);
	120	memzero_explicit(ctx, sizeof(*ctx));
3473187d JL	121
3473187d JL	122	return 0;
f0706e82 JB	123	}
	124
	125
	126	/* Perform WEP encryption on given skb. 4 bytes of extra space (IV) in the
	127	* beginning of the buffer 4 bytes of extra space (ICV) in the end of the
	128	* buffer will be added. Both IV and ICV will be transmitted, so the
	129	* payload length increases with 8 bytes.
	130	*
	131	* WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
	132	*/
fffd0934 JB	133	int ieee80211_wep_encrypt(struct ieee80211_local *local,
	134	struct sk_buff *skb,
	135	const u8 *key, int keylen, int keyidx)
f0706e82	136	{
c9cf0122	137	u8 *iv;
f0706e82	138	size_t len;
c9cf0122	139	u8 rc4key[3 + WLAN_KEY_LEN_WEP104];
f0706e82	140
47b4e1fc JD	141	if (WARN_ON(skb_tailroom(skb) < IEEE80211_WEP_ICV_LEN))
	142	return -1;
	143
c9cf0122 JB	144	iv = ieee80211_wep_add_iv(local, skb, keylen, keyidx);
c9cf0122 JB	145	if (!iv)
f0706e82	146	return -1;
f0706e82	147
4325f6ca	148	len = skb->len - (iv + IEEE80211_WEP_IV_LEN - skb->data);
f0706e82 JB	149
	150	/* Prepend 24-bit IV to RC4 key */
	151	memcpy(rc4key, iv, 3);
	152
	153	/* Copy rest of the WEP key (the secret part) */
c9cf0122	154	memcpy(rc4key + 3, key, keylen);
f0706e82 JB	155
f0706e82 JB	156	/* Add room for ICV */
4325f6ca	157	skb_put(skb, IEEE80211_WEP_ICV_LEN);
f0706e82	158
5fdb3735	159	return ieee80211_wep_encrypt_data(&local->wep_tx_ctx, rc4key, keylen + 3,
4325f6ca	160	iv + IEEE80211_WEP_IV_LEN, len);
f0706e82 JB	161	}
	162
	163
	164	/* Perform WEP decryption using given key. data buffer includes encrypted
	165	* payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV.
	166	* Return 0 on success and -1 on ICV mismatch. */
5fdb3735	167	int ieee80211_wep_decrypt_data(struct arc4_ctx ctx, u8 rc4key,
f0706e82 JB	168	size_t klen, u8 *data, size_t data_len)
f0706e82 JB	169	{
f0706e82	170	__le32 crc;
3473187d	171
5fdb3735 AB	172	arc4_setkey(ctx, rc4key, klen);
	173	arc4_crypt(ctx, data, data, data_len + IEEE80211_WEP_ICV_LEN);
	174	memzero_explicit(ctx, sizeof(*ctx));
f0706e82 JB	175
f0706e82 JB	176	crc = cpu_to_le32(~crc32_le(~0, data, data_len));
4325f6ca	177	if (memcmp(&crc, data + data_len, IEEE80211_WEP_ICV_LEN) != 0)
f0706e82 JB	178	/* ICV mismatch */
	179	return -1;
	180
	181	return 0;
	182	}
	183
	184
	185	/* Perform WEP decryption on given skb. Buffer includes whole WEP part of
	186	* the frame: IV (4 bytes), encrypted payload (including SNAP header),
	187	* ICV (4 bytes). skb->len includes both IV and ICV.
	188	*
	189	* Returns 0 if frame was decrypted successfully and ICV was correct and -1 on
	190	* failure. If frame is OK, IV and ICV will be removed, i.e., decrypted payload
	191	* is moved to the beginning of the skb and skb length will be reduced.
	192	*/
c9cf0122 JB	193	static int ieee80211_wep_decrypt(struct ieee80211_local *local,
	194	struct sk_buff *skb,
	195	struct ieee80211_key *key)
f0706e82 JB	196	{
f0706e82 JB	197	u32 klen;
730bd83b	198	u8 rc4key[3 + WLAN_KEY_LEN_WEP104];
f0706e82	199	u8 keyidx;
70217d7f HH	200	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
70217d7f HH	201	unsigned int hdrlen;
f0706e82 JB	202	size_t len;
	203	int ret = 0;
	204
70217d7f	205	if (!ieee80211_has_protected(hdr->frame_control))
f0706e82 JB	206	return -1;
f0706e82 JB	207
70217d7f	208	hdrlen = ieee80211_hdrlen(hdr->frame_control);
4325f6ca	209	if (skb->len < hdrlen + IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN)
f0706e82 JB	210	return -1;
f0706e82 JB	211
4325f6ca	212	len = skb->len - hdrlen - IEEE80211_WEP_IV_LEN - IEEE80211_WEP_ICV_LEN;
f0706e82 JB	213
	214	keyidx = skb->data[hdrlen + 3] >> 6;
	215
97359d12	216	if (!key \|\| keyidx != key->conf.keyidx)
f0706e82 JB	217	return -1;
f0706e82 JB	218
8f20fc24	219	klen = 3 + key->conf.keylen;
f0706e82	220
f0706e82 JB	221	/* Prepend 24-bit IV to RC4 key */
	222	memcpy(rc4key, skb->data + hdrlen, 3);
	223
	224	/* Copy rest of the WEP key (the secret part) */
8f20fc24	225	memcpy(rc4key + 3, key->conf.key, key->conf.keylen);
f0706e82	226
5fdb3735	227	if (ieee80211_wep_decrypt_data(&local->wep_rx_ctx, rc4key, klen,
4325f6ca JB	228	skb->data + hdrlen +
4325f6ca JB	229	IEEE80211_WEP_IV_LEN, len))
f0706e82	230	ret = -1;
f0706e82	231
f0706e82	232	/* Trim ICV */
4325f6ca	233	skb_trim(skb, skb->len - IEEE80211_WEP_ICV_LEN);
f0706e82 JB	234
f0706e82 JB	235	/* Remove IV */
4325f6ca JB	236	memmove(skb->data + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
4325f6ca JB	237	skb_pull(skb, IEEE80211_WEP_IV_LEN);
f0706e82 JB	238
	239	return ret;
	240	}
	241
9ae54c84	242	ieee80211_rx_result
5cf121c3	243	ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx)
4f0d18e2	244	{
eb9fb5b8 JB	245	struct sk_buff *skb = rx->skb;
	246	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	247	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
a8286911	248	__le16 fc = hdr->frame_control;
358c8d9d	249
a8286911	250	if (!ieee80211_is_data(fc) && !ieee80211_is_auth(fc))
9ae54c84	251	return RX_CONTINUE;
4f0d18e2	252
eb9fb5b8	253	if (!(status->flag & RX_FLAG_DECRYPTED)) {
a8286911 JB	254	if (skb_linearize(rx->skb))
a8286911 JB	255	return RX_DROP_UNUSABLE;
f4ea83dd	256	if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key))
e4c26add	257	return RX_DROP_UNUSABLE;
eb9fb5b8	258	} else if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
4325f6ca JB	259	if (!pskb_may_pull(rx->skb, ieee80211_hdrlen(fc) +
4325f6ca JB	260	IEEE80211_WEP_IV_LEN))
a8286911	261	return RX_DROP_UNUSABLE;
4f0d18e2 JB	262	ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
4f0d18e2 JB	263	/* remove ICV */
cef0acd4 DS	264	if (!(status->flag & RX_FLAG_ICV_STRIPPED) &&
cef0acd4 DS	265	pskb_trim(rx->skb, rx->skb->len - IEEE80211_WEP_ICV_LEN))
a8286911	266	return RX_DROP_UNUSABLE;
4f0d18e2 JB	267	}
4f0d18e2 JB	268
9ae54c84	269	return RX_CONTINUE;
4f0d18e2	270	}
6a22a59d	271
5cf121c3	272	static int wep_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
6a22a59d	273	{
e039fa4a	274	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
ee70108f	275	struct ieee80211_key_conf *hw_key = info->control.hw_key;
e039fa4a	276
ee70108f	277	if (!hw_key) {
c9cf0122 JB	278	if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key,
	279	tx->key->conf.keylen,
	280	tx->key->conf.keyidx))
6a22a59d	281	return -1;
ee70108f JD	282	} else if ((hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) \|\|
ee70108f JD	283	(hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
813d7669 JB	284	if (!ieee80211_wep_add_iv(tx->local, skb,
	285	tx->key->conf.keylen,
	286	tx->key->conf.keyidx))
	287	return -1;
	288	}
	289
6a22a59d JB	290	return 0;
	291	}
	292
9ae54c84	293	ieee80211_tx_result
5cf121c3	294	ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx)
6a22a59d	295	{
2de8e0d9	296	struct sk_buff *skb;
c6a1fa12	297
5cf121c3	298	ieee80211_tx_set_protected(tx);
6a22a59d	299
252b86c4	300	skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 JB	301	if (wep_encrypt_skb(tx, skb) < 0) {
	302	I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
	303	return TX_DROP;
6a22a59d	304	}
252b86c4	305	}
6a22a59d	306
9ae54c84	307	return TX_CONTINUE;
6a22a59d	308	}