blob: efa3f48f1ec5d51ea7191c8ae90dda77c0d330e1 [file] [log] [blame]
Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
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>
Ralf Baechle11763602007-10-23 20:42:11 +020019#include <linux/scatterlist.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Ivan Kuten860c6e62008-11-24 15:17:54 -050021#include <asm/unaligned.h>
Jiri Bencf0706e82007-05-05 11:45:53 -070022
23#include <net/mac80211.h>
24#include "ieee80211_i.h"
25#include "wep.h"
26
27
28int ieee80211_wep_init(struct ieee80211_local *local)
29{
30 /* start WEP IV from a random value */
Johannes Berg4325f6c2013-05-08 13:09:08 +020031 get_random_bytes(&local->wep_iv, IEEE80211_WEP_IV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -070032
Felix Fietkau5f9f1812011-03-25 21:39:19 +010033 local->wep_tx_tfm = crypto_alloc_cipher("arc4", 0, CRYPTO_ALG_ASYNC);
John W. Linville088c8722010-07-15 16:16:17 -040034 if (IS_ERR(local->wep_tx_tfm)) {
35 local->wep_rx_tfm = ERR_PTR(-EINVAL);
Jeremy Fitzhardinge023a04b2008-07-14 12:52:08 -070036 return PTR_ERR(local->wep_tx_tfm);
John W. Linville088c8722010-07-15 16:16:17 -040037 }
Jiri Bencf0706e82007-05-05 11:45:53 -070038
Felix Fietkau5f9f1812011-03-25 21:39:19 +010039 local->wep_rx_tfm = crypto_alloc_cipher("arc4", 0, CRYPTO_ALG_ASYNC);
Jiri Bencf0706e82007-05-05 11:45:53 -070040 if (IS_ERR(local->wep_rx_tfm)) {
Felix Fietkau5f9f1812011-03-25 21:39:19 +010041 crypto_free_cipher(local->wep_tx_tfm);
John W. Linville088c8722010-07-15 16:16:17 -040042 local->wep_tx_tfm = ERR_PTR(-EINVAL);
Jeremy Fitzhardinge023a04b2008-07-14 12:52:08 -070043 return PTR_ERR(local->wep_rx_tfm);
Jiri Bencf0706e82007-05-05 11:45:53 -070044 }
45
46 return 0;
47}
48
49void ieee80211_wep_free(struct ieee80211_local *local)
50{
John W. Linville34731872010-07-07 15:07:49 -040051 if (!IS_ERR(local->wep_tx_tfm))
Felix Fietkau5f9f1812011-03-25 21:39:19 +010052 crypto_free_cipher(local->wep_tx_tfm);
John W. Linville34731872010-07-07 15:07:49 -040053 if (!IS_ERR(local->wep_rx_tfm))
Felix Fietkau5f9f1812011-03-25 21:39:19 +010054 crypto_free_cipher(local->wep_rx_tfm);
Jiri Bencf0706e82007-05-05 11:45:53 -070055}
56
Johannes Bergc6a1fa12008-10-07 12:04:32 +020057static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen)
Jiri Bencf0706e82007-05-05 11:45:53 -070058{
Johannes Bergc6a1fa12008-10-07 12:04:32 +020059 /*
60 * Fluhrer, Mantin, and Shamir have reported weaknesses in the
Jiri Bencf0706e82007-05-05 11:45:53 -070061 * key scheduling algorithm of RC4. At least IVs (KeyByte + 3,
Johannes Bergc6a1fa12008-10-07 12:04:32 +020062 * 0xff, N) can be used to speedup attacks, so avoid using them.
63 */
Jiri Bencf0706e82007-05-05 11:45:53 -070064 if ((iv & 0xff00) == 0xff00) {
65 u8 B = (iv >> 16) & 0xff;
66 if (B >= 3 && B < 3 + keylen)
Johannes Bergc6a1fa12008-10-07 12:04:32 +020067 return true;
Jiri Bencf0706e82007-05-05 11:45:53 -070068 }
Johannes Bergc6a1fa12008-10-07 12:04:32 +020069 return false;
Jiri Bencf0706e82007-05-05 11:45:53 -070070}
71
72
Johannes Berg4f0d18e2007-09-26 15:19:40 +020073static void ieee80211_wep_get_iv(struct ieee80211_local *local,
Johannes Bergc9cf0122009-07-07 03:45:18 +020074 int keylen, int keyidx, u8 *iv)
Jiri Bencf0706e82007-05-05 11:45:53 -070075{
76 local->wep_iv++;
Johannes Bergc9cf0122009-07-07 03:45:18 +020077 if (ieee80211_wep_weak_iv(local->wep_iv, keylen))
Jiri Bencf0706e82007-05-05 11:45:53 -070078 local->wep_iv += 0x0100;
79
80 if (!iv)
81 return;
82
83 *iv++ = (local->wep_iv >> 16) & 0xff;
84 *iv++ = (local->wep_iv >> 8) & 0xff;
85 *iv++ = local->wep_iv & 0xff;
Johannes Bergc9cf0122009-07-07 03:45:18 +020086 *iv++ = keyidx << 6;
Jiri Bencf0706e82007-05-05 11:45:53 -070087}
88
89
Johannes Berg6a22a592007-09-26 15:19:41 +020090static u8 *ieee80211_wep_add_iv(struct ieee80211_local *local,
91 struct sk_buff *skb,
Johannes Bergc9cf0122009-07-07 03:45:18 +020092 int keylen, int keyidx)
Jiri Bencf0706e82007-05-05 11:45:53 -070093{
Harvey Harrison70217d72008-06-22 16:45:23 -070094 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Janusz.Dziedzic@tieto.comee701082012-05-09 08:11:20 +030095 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Harvey Harrison70217d72008-06-22 16:45:23 -070096 unsigned int hdrlen;
Jiri Bencf0706e82007-05-05 11:45:53 -070097 u8 *newhdr;
98
Harvey Harrison70217d72008-06-22 16:45:23 -070099 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
Jiri Bencf0706e82007-05-05 11:45:53 -0700100
Janusz Dziedzic47b4e1f2015-05-11 11:31:15 +0200101 if (WARN_ON(skb_headroom(skb) < IEEE80211_WEP_IV_LEN))
Johannes Berg23c07522008-05-29 10:38:53 +0200102 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700103
Harvey Harrison70217d72008-06-22 16:45:23 -0700104 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg4325f6c2013-05-08 13:09:08 +0200105 newhdr = skb_push(skb, IEEE80211_WEP_IV_LEN);
106 memmove(newhdr, newhdr + IEEE80211_WEP_IV_LEN, hdrlen);
Janusz.Dziedzic@tieto.comee701082012-05-09 08:11:20 +0300107
108 /* the HW only needs room for the IV, but not the actual IV */
109 if (info->control.hw_key &&
110 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
111 return newhdr + hdrlen;
112
Johannes Bergc9cf0122009-07-07 03:45:18 +0200113 ieee80211_wep_get_iv(local, keylen, keyidx, newhdr + hdrlen);
Jiri Bencf0706e82007-05-05 11:45:53 -0700114 return newhdr + hdrlen;
115}
116
117
Johannes Berg4f0d18e2007-09-26 15:19:40 +0200118static void ieee80211_wep_remove_iv(struct ieee80211_local *local,
119 struct sk_buff *skb,
120 struct ieee80211_key *key)
Jiri Bencf0706e82007-05-05 11:45:53 -0700121{
Harvey Harrison70217d72008-06-22 16:45:23 -0700122 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
123 unsigned int hdrlen;
Jiri Bencf0706e82007-05-05 11:45:53 -0700124
Harvey Harrison70217d72008-06-22 16:45:23 -0700125 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg4325f6c2013-05-08 13:09:08 +0200126 memmove(skb->data + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
127 skb_pull(skb, IEEE80211_WEP_IV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700128}
129
130
131/* Perform WEP encryption using given key. data buffer must have tailroom
132 * for 4-byte ICV. data_len must not include this ICV. Note: this function
133 * does _not_ add IV. data = RC4(data | CRC32(data)) */
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100134int ieee80211_wep_encrypt_data(struct crypto_cipher *tfm, u8 *rc4key,
John W. Linville34731872010-07-07 15:07:49 -0400135 size_t klen, u8 *data, size_t data_len)
Jiri Bencf0706e82007-05-05 11:45:53 -0700136{
Ivan Kuten860c6e62008-11-24 15:17:54 -0500137 __le32 icv;
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100138 int i;
Jiri Bencf0706e82007-05-05 11:45:53 -0700139
John W. Linville34731872010-07-07 15:07:49 -0400140 if (IS_ERR(tfm))
141 return -1;
142
Ivan Kuten860c6e62008-11-24 15:17:54 -0500143 icv = cpu_to_le32(~crc32_le(~0, data, data_len));
144 put_unaligned(icv, (__le32 *)(data + data_len));
Jiri Bencf0706e82007-05-05 11:45:53 -0700145
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100146 crypto_cipher_setkey(tfm, rc4key, klen);
Johannes Berg4325f6c2013-05-08 13:09:08 +0200147 for (i = 0; i < data_len + IEEE80211_WEP_ICV_LEN; i++)
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100148 crypto_cipher_encrypt_one(tfm, data + i, data + i);
John W. Linville34731872010-07-07 15:07:49 -0400149
150 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700151}
152
153
154/* Perform WEP encryption on given skb. 4 bytes of extra space (IV) in the
155 * beginning of the buffer 4 bytes of extra space (ICV) in the end of the
156 * buffer will be added. Both IV and ICV will be transmitted, so the
157 * payload length increases with 8 bytes.
158 *
159 * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
160 */
Johannes Bergfffd0932009-07-08 14:22:54 +0200161int ieee80211_wep_encrypt(struct ieee80211_local *local,
162 struct sk_buff *skb,
163 const u8 *key, int keylen, int keyidx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700164{
Johannes Bergc9cf0122009-07-07 03:45:18 +0200165 u8 *iv;
Jiri Bencf0706e82007-05-05 11:45:53 -0700166 size_t len;
Johannes Bergc9cf0122009-07-07 03:45:18 +0200167 u8 rc4key[3 + WLAN_KEY_LEN_WEP104];
Jiri Bencf0706e82007-05-05 11:45:53 -0700168
Janusz Dziedzic47b4e1f2015-05-11 11:31:15 +0200169 if (WARN_ON(skb_tailroom(skb) < IEEE80211_WEP_ICV_LEN))
170 return -1;
171
Johannes Bergc9cf0122009-07-07 03:45:18 +0200172 iv = ieee80211_wep_add_iv(local, skb, keylen, keyidx);
173 if (!iv)
Jiri Bencf0706e82007-05-05 11:45:53 -0700174 return -1;
175
Johannes Berg4325f6c2013-05-08 13:09:08 +0200176 len = skb->len - (iv + IEEE80211_WEP_IV_LEN - skb->data);
Jiri Bencf0706e82007-05-05 11:45:53 -0700177
178 /* Prepend 24-bit IV to RC4 key */
179 memcpy(rc4key, iv, 3);
180
181 /* Copy rest of the WEP key (the secret part) */
Johannes Bergc9cf0122009-07-07 03:45:18 +0200182 memcpy(rc4key + 3, key, keylen);
Jiri Bencf0706e82007-05-05 11:45:53 -0700183
184 /* Add room for ICV */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200185 skb_put(skb, IEEE80211_WEP_ICV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700186
John W. Linville34731872010-07-07 15:07:49 -0400187 return ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, keylen + 3,
Johannes Berg4325f6c2013-05-08 13:09:08 +0200188 iv + IEEE80211_WEP_IV_LEN, len);
Jiri Bencf0706e82007-05-05 11:45:53 -0700189}
190
191
192/* Perform WEP decryption using given key. data buffer includes encrypted
193 * payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV.
194 * Return 0 on success and -1 on ICV mismatch. */
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100195int ieee80211_wep_decrypt_data(struct crypto_cipher *tfm, u8 *rc4key,
Jiri Bencf0706e82007-05-05 11:45:53 -0700196 size_t klen, u8 *data, size_t data_len)
197{
Jiri Bencf0706e82007-05-05 11:45:53 -0700198 __le32 crc;
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100199 int i;
Jiri Bencf0706e82007-05-05 11:45:53 -0700200
John W. Linville34731872010-07-07 15:07:49 -0400201 if (IS_ERR(tfm))
202 return -1;
203
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100204 crypto_cipher_setkey(tfm, rc4key, klen);
Johannes Berg4325f6c2013-05-08 13:09:08 +0200205 for (i = 0; i < data_len + IEEE80211_WEP_ICV_LEN; i++)
Felix Fietkau5f9f1812011-03-25 21:39:19 +0100206 crypto_cipher_decrypt_one(tfm, data + i, data + i);
Jiri Bencf0706e82007-05-05 11:45:53 -0700207
208 crc = cpu_to_le32(~crc32_le(~0, data, data_len));
Johannes Berg4325f6c2013-05-08 13:09:08 +0200209 if (memcmp(&crc, data + data_len, IEEE80211_WEP_ICV_LEN) != 0)
Jiri Bencf0706e82007-05-05 11:45:53 -0700210 /* ICV mismatch */
211 return -1;
212
213 return 0;
214}
215
216
217/* Perform WEP decryption on given skb. Buffer includes whole WEP part of
218 * the frame: IV (4 bytes), encrypted payload (including SNAP header),
219 * ICV (4 bytes). skb->len includes both IV and ICV.
220 *
221 * Returns 0 if frame was decrypted successfully and ICV was correct and -1 on
222 * failure. If frame is OK, IV and ICV will be removed, i.e., decrypted payload
223 * is moved to the beginning of the skb and skb length will be reduced.
224 */
Johannes Bergc9cf0122009-07-07 03:45:18 +0200225static int ieee80211_wep_decrypt(struct ieee80211_local *local,
226 struct sk_buff *skb,
227 struct ieee80211_key *key)
Jiri Bencf0706e82007-05-05 11:45:53 -0700228{
229 u32 klen;
Johannes Berg730bd832010-10-10 18:52:10 +0200230 u8 rc4key[3 + WLAN_KEY_LEN_WEP104];
Jiri Bencf0706e82007-05-05 11:45:53 -0700231 u8 keyidx;
Harvey Harrison70217d72008-06-22 16:45:23 -0700232 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
233 unsigned int hdrlen;
Jiri Bencf0706e82007-05-05 11:45:53 -0700234 size_t len;
235 int ret = 0;
236
Harvey Harrison70217d72008-06-22 16:45:23 -0700237 if (!ieee80211_has_protected(hdr->frame_control))
Jiri Bencf0706e82007-05-05 11:45:53 -0700238 return -1;
239
Harvey Harrison70217d72008-06-22 16:45:23 -0700240 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg4325f6c2013-05-08 13:09:08 +0200241 if (skb->len < hdrlen + IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN)
Jiri Bencf0706e82007-05-05 11:45:53 -0700242 return -1;
243
Johannes Berg4325f6c2013-05-08 13:09:08 +0200244 len = skb->len - hdrlen - IEEE80211_WEP_IV_LEN - IEEE80211_WEP_ICV_LEN;
Jiri Bencf0706e82007-05-05 11:45:53 -0700245
246 keyidx = skb->data[hdrlen + 3] >> 6;
247
Johannes Berg97359d12010-08-10 09:46:38 +0200248 if (!key || keyidx != key->conf.keyidx)
Jiri Bencf0706e82007-05-05 11:45:53 -0700249 return -1;
250
Johannes Berg8f20fc22007-08-28 17:01:54 -0400251 klen = 3 + key->conf.keylen;
Jiri Bencf0706e82007-05-05 11:45:53 -0700252
Jiri Bencf0706e82007-05-05 11:45:53 -0700253 /* Prepend 24-bit IV to RC4 key */
254 memcpy(rc4key, skb->data + hdrlen, 3);
255
256 /* Copy rest of the WEP key (the secret part) */
Johannes Berg8f20fc22007-08-28 17:01:54 -0400257 memcpy(rc4key + 3, key->conf.key, key->conf.keylen);
Jiri Bencf0706e82007-05-05 11:45:53 -0700258
259 if (ieee80211_wep_decrypt_data(local->wep_rx_tfm, rc4key, klen,
Johannes Berg4325f6c2013-05-08 13:09:08 +0200260 skb->data + hdrlen +
261 IEEE80211_WEP_IV_LEN, len))
Jiri Bencf0706e82007-05-05 11:45:53 -0700262 ret = -1;
Jiri Bencf0706e82007-05-05 11:45:53 -0700263
Jiri Bencf0706e82007-05-05 11:45:53 -0700264 /* Trim ICV */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200265 skb_trim(skb, skb->len - IEEE80211_WEP_ICV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700266
267 /* Remove IV */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200268 memmove(skb->data + IEEE80211_WEP_IV_LEN, skb->data, hdrlen);
269 skb_pull(skb, IEEE80211_WEP_IV_LEN);
Jiri Bencf0706e82007-05-05 11:45:53 -0700270
271 return ret;
272}
273
Johannes Berg9ae54c82008-01-31 19:48:20 +0100274ieee80211_rx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100275ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx)
Johannes Berg4f0d18e2007-09-26 15:19:40 +0200276{
Johannes Bergeb9fb5b82009-11-16 13:58:20 +0100277 struct sk_buff *skb = rx->skb;
278 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
279 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berga8286912012-03-12 13:49:14 +0100280 __le16 fc = hdr->frame_control;
Harvey Harrison358c8d92008-07-15 18:44:13 -0700281
Johannes Berga8286912012-03-12 13:49:14 +0100282 if (!ieee80211_is_data(fc) && !ieee80211_is_auth(fc))
Johannes Berg9ae54c82008-01-31 19:48:20 +0100283 return RX_CONTINUE;
Johannes Berg4f0d18e2007-09-26 15:19:40 +0200284
Johannes Bergeb9fb5b82009-11-16 13:58:20 +0100285 if (!(status->flag & RX_FLAG_DECRYPTED)) {
Johannes Berga8286912012-03-12 13:49:14 +0100286 if (skb_linearize(rx->skb))
287 return RX_DROP_UNUSABLE;
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200288 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key))
Johannes Berge4c26ad2008-01-31 19:48:21 +0100289 return RX_DROP_UNUSABLE;
Johannes Bergeb9fb5b82009-11-16 13:58:20 +0100290 } else if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
Johannes Berg4325f6c2013-05-08 13:09:08 +0200291 if (!pskb_may_pull(rx->skb, ieee80211_hdrlen(fc) +
292 IEEE80211_WEP_IV_LEN))
Johannes Berga8286912012-03-12 13:49:14 +0100293 return RX_DROP_UNUSABLE;
Johannes Berg4f0d18e2007-09-26 15:19:40 +0200294 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
295 /* remove ICV */
Johannes Berg4325f6c2013-05-08 13:09:08 +0200296 if (pskb_trim(rx->skb, rx->skb->len - IEEE80211_WEP_ICV_LEN))
Johannes Berga8286912012-03-12 13:49:14 +0100297 return RX_DROP_UNUSABLE;
Johannes Berg4f0d18e2007-09-26 15:19:40 +0200298 }
299
Johannes Berg9ae54c82008-01-31 19:48:20 +0100300 return RX_CONTINUE;
Johannes Berg4f0d18e2007-09-26 15:19:40 +0200301}
Johannes Berg6a22a592007-09-26 15:19:41 +0200302
Johannes Berg5cf121c2008-02-25 16:27:43 +0100303static int wep_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
Johannes Berg6a22a592007-09-26 15:19:41 +0200304{
Johannes Berge039fa42008-05-15 12:55:29 +0200305 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Janusz.Dziedzic@tieto.comee701082012-05-09 08:11:20 +0300306 struct ieee80211_key_conf *hw_key = info->control.hw_key;
Johannes Berge039fa42008-05-15 12:55:29 +0200307
Janusz.Dziedzic@tieto.comee701082012-05-09 08:11:20 +0300308 if (!hw_key) {
Johannes Bergc9cf0122009-07-07 03:45:18 +0200309 if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key,
310 tx->key->conf.keylen,
311 tx->key->conf.keyidx))
Johannes Berg6a22a592007-09-26 15:19:41 +0200312 return -1;
Janusz.Dziedzic@tieto.comee701082012-05-09 08:11:20 +0300313 } else if ((hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
314 (hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
Johannes Berg813d7662010-01-17 01:47:58 +0100315 if (!ieee80211_wep_add_iv(tx->local, skb,
316 tx->key->conf.keylen,
317 tx->key->conf.keyidx))
318 return -1;
319 }
320
Johannes Berg6a22a592007-09-26 15:19:41 +0200321 return 0;
322}
323
Johannes Berg9ae54c82008-01-31 19:48:20 +0100324ieee80211_tx_result
Johannes Berg5cf121c2008-02-25 16:27:43 +0100325ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx)
Johannes Berg6a22a592007-09-26 15:19:41 +0200326{
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100327 struct sk_buff *skb;
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200328
Johannes Berg5cf121c2008-02-25 16:27:43 +0100329 ieee80211_tx_set_protected(tx);
Johannes Berg6a22a592007-09-26 15:19:41 +0200330
Johannes Berg252b86c2011-11-16 15:28:55 +0100331 skb_queue_walk(&tx->skbs, skb) {
Johannes Berg2de8e0d2009-03-23 17:28:35 +0100332 if (wep_encrypt_skb(tx, skb) < 0) {
333 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
334 return TX_DROP;
Johannes Berg6a22a592007-09-26 15:19:41 +0200335 }
Johannes Berg252b86c2011-11-16 15:28:55 +0100336 }
Johannes Berg6a22a592007-09-26 15:19:41 +0200337
Johannes Berg9ae54c82008-01-31 19:48:20 +0100338 return TX_CONTINUE;
Johannes Berg6a22a592007-09-26 15:19:41 +0200339}