Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 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> |
Ralf Baechle | 1176360 | 2007-10-23 20:42:11 +0200 | [diff] [blame] | 19 | #include <linux/scatterlist.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Ivan Kuten | 860c6e6 | 2008-11-24 15:17:54 -0500 | [diff] [blame] | 21 | #include <asm/unaligned.h> |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 22 | |
| 23 | #include <net/mac80211.h> |
| 24 | #include "ieee80211_i.h" |
| 25 | #include "wep.h" |
| 26 | |
| 27 | |
| 28 | int ieee80211_wep_init(struct ieee80211_local *local) |
| 29 | { |
| 30 | /* start WEP IV from a random value */ |
| 31 | get_random_bytes(&local->wep_iv, WEP_IV_LEN); |
| 32 | |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 33 | local->wep_tx_tfm = crypto_alloc_cipher("arc4", 0, CRYPTO_ALG_ASYNC); |
John W. Linville | 088c872 | 2010-07-15 16:16:17 -0400 | [diff] [blame] | 34 | if (IS_ERR(local->wep_tx_tfm)) { |
| 35 | local->wep_rx_tfm = ERR_PTR(-EINVAL); |
Jeremy Fitzhardinge | 023a04b | 2008-07-14 12:52:08 -0700 | [diff] [blame] | 36 | return PTR_ERR(local->wep_tx_tfm); |
John W. Linville | 088c872 | 2010-07-15 16:16:17 -0400 | [diff] [blame] | 37 | } |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 38 | |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 39 | local->wep_rx_tfm = crypto_alloc_cipher("arc4", 0, CRYPTO_ALG_ASYNC); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 40 | if (IS_ERR(local->wep_rx_tfm)) { |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 41 | crypto_free_cipher(local->wep_tx_tfm); |
John W. Linville | 088c872 | 2010-07-15 16:16:17 -0400 | [diff] [blame] | 42 | local->wep_tx_tfm = ERR_PTR(-EINVAL); |
Jeremy Fitzhardinge | 023a04b | 2008-07-14 12:52:08 -0700 | [diff] [blame] | 43 | return PTR_ERR(local->wep_rx_tfm); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | void ieee80211_wep_free(struct ieee80211_local *local) |
| 50 | { |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 51 | if (!IS_ERR(local->wep_tx_tfm)) |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 52 | crypto_free_cipher(local->wep_tx_tfm); |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 53 | if (!IS_ERR(local->wep_rx_tfm)) |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 54 | crypto_free_cipher(local->wep_rx_tfm); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 55 | } |
| 56 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 57 | static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 58 | { |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 59 | /* |
| 60 | * Fluhrer, Mantin, and Shamir have reported weaknesses in the |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 61 | * key scheduling algorithm of RC4. At least IVs (KeyByte + 3, |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 62 | * 0xff, N) can be used to speedup attacks, so avoid using them. |
| 63 | */ |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 64 | if ((iv & 0xff00) == 0xff00) { |
| 65 | u8 B = (iv >> 16) & 0xff; |
| 66 | if (B >= 3 && B < 3 + keylen) |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 67 | return true; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 68 | } |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 69 | return false; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 73 | static void ieee80211_wep_get_iv(struct ieee80211_local *local, |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 74 | int keylen, int keyidx, u8 *iv) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 75 | { |
| 76 | local->wep_iv++; |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 77 | if (ieee80211_wep_weak_iv(local->wep_iv, keylen)) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 78 | 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 Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 86 | *iv++ = keyidx << 6; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 90 | static u8 *ieee80211_wep_add_iv(struct ieee80211_local *local, |
| 91 | struct sk_buff *skb, |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 92 | int keylen, int keyidx) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 93 | { |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 94 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 95 | unsigned int hdrlen; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 96 | u8 *newhdr; |
| 97 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 98 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 99 | |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 100 | if (WARN_ON(skb_tailroom(skb) < WEP_ICV_LEN || |
| 101 | skb_headroom(skb) < WEP_IV_LEN)) |
| 102 | return NULL; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 103 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 104 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 105 | newhdr = skb_push(skb, WEP_IV_LEN); |
| 106 | memmove(newhdr, newhdr + WEP_IV_LEN, hdrlen); |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 107 | ieee80211_wep_get_iv(local, keylen, keyidx, newhdr + hdrlen); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 108 | return newhdr + hdrlen; |
| 109 | } |
| 110 | |
| 111 | |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 112 | static void ieee80211_wep_remove_iv(struct ieee80211_local *local, |
| 113 | struct sk_buff *skb, |
| 114 | struct ieee80211_key *key) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 115 | { |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 116 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 117 | unsigned int hdrlen; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 118 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 119 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 120 | memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen); |
| 121 | skb_pull(skb, WEP_IV_LEN); |
| 122 | } |
| 123 | |
| 124 | |
| 125 | /* Perform WEP encryption using given key. data buffer must have tailroom |
| 126 | * for 4-byte ICV. data_len must not include this ICV. Note: this function |
| 127 | * does _not_ add IV. data = RC4(data | CRC32(data)) */ |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 128 | int ieee80211_wep_encrypt_data(struct crypto_cipher *tfm, u8 *rc4key, |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 129 | size_t klen, u8 *data, size_t data_len) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 130 | { |
Ivan Kuten | 860c6e6 | 2008-11-24 15:17:54 -0500 | [diff] [blame] | 131 | __le32 icv; |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 132 | int i; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 133 | |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 134 | if (IS_ERR(tfm)) |
| 135 | return -1; |
| 136 | |
Ivan Kuten | 860c6e6 | 2008-11-24 15:17:54 -0500 | [diff] [blame] | 137 | icv = cpu_to_le32(~crc32_le(~0, data, data_len)); |
| 138 | put_unaligned(icv, (__le32 *)(data + data_len)); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 139 | |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 140 | crypto_cipher_setkey(tfm, rc4key, klen); |
| 141 | for (i = 0; i < data_len + WEP_ICV_LEN; i++) |
| 142 | crypto_cipher_encrypt_one(tfm, data + i, data + i); |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 143 | |
| 144 | return 0; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | |
| 148 | /* Perform WEP encryption on given skb. 4 bytes of extra space (IV) in the |
| 149 | * beginning of the buffer 4 bytes of extra space (ICV) in the end of the |
| 150 | * buffer will be added. Both IV and ICV will be transmitted, so the |
| 151 | * payload length increases with 8 bytes. |
| 152 | * |
| 153 | * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data)) |
| 154 | */ |
Johannes Berg | fffd093 | 2009-07-08 14:22:54 +0200 | [diff] [blame] | 155 | int ieee80211_wep_encrypt(struct ieee80211_local *local, |
| 156 | struct sk_buff *skb, |
| 157 | const u8 *key, int keylen, int keyidx) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 158 | { |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 159 | u8 *iv; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 160 | size_t len; |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 161 | u8 rc4key[3 + WLAN_KEY_LEN_WEP104]; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 162 | |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 163 | iv = ieee80211_wep_add_iv(local, skb, keylen, keyidx); |
| 164 | if (!iv) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 165 | return -1; |
| 166 | |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 167 | len = skb->len - (iv + WEP_IV_LEN - skb->data); |
| 168 | |
| 169 | /* Prepend 24-bit IV to RC4 key */ |
| 170 | memcpy(rc4key, iv, 3); |
| 171 | |
| 172 | /* Copy rest of the WEP key (the secret part) */ |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 173 | memcpy(rc4key + 3, key, keylen); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 174 | |
| 175 | /* Add room for ICV */ |
| 176 | skb_put(skb, WEP_ICV_LEN); |
| 177 | |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 178 | return ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, keylen + 3, |
| 179 | iv + WEP_IV_LEN, len); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | |
| 183 | /* Perform WEP decryption using given key. data buffer includes encrypted |
| 184 | * payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV. |
| 185 | * Return 0 on success and -1 on ICV mismatch. */ |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 186 | int ieee80211_wep_decrypt_data(struct crypto_cipher *tfm, u8 *rc4key, |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 187 | size_t klen, u8 *data, size_t data_len) |
| 188 | { |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 189 | __le32 crc; |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 190 | int i; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 191 | |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 192 | if (IS_ERR(tfm)) |
| 193 | return -1; |
| 194 | |
Felix Fietkau | 5f9f181 | 2011-03-25 21:39:19 +0100 | [diff] [blame] | 195 | crypto_cipher_setkey(tfm, rc4key, klen); |
| 196 | for (i = 0; i < data_len + WEP_ICV_LEN; i++) |
| 197 | crypto_cipher_decrypt_one(tfm, data + i, data + i); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 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 | */ |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 216 | static int ieee80211_wep_decrypt(struct ieee80211_local *local, |
| 217 | struct sk_buff *skb, |
| 218 | struct ieee80211_key *key) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 219 | { |
| 220 | u32 klen; |
Johannes Berg | 730bd83 | 2010-10-10 18:52:10 +0200 | [diff] [blame] | 221 | u8 rc4key[3 + WLAN_KEY_LEN_WEP104]; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 222 | u8 keyidx; |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 223 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 224 | unsigned int hdrlen; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 225 | size_t len; |
| 226 | int ret = 0; |
| 227 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 228 | if (!ieee80211_has_protected(hdr->frame_control)) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 229 | return -1; |
| 230 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 231 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Harvey Harrison | d298487 | 2008-07-15 18:44:10 -0700 | [diff] [blame] | 232 | if (skb->len < hdrlen + WEP_IV_LEN + WEP_ICV_LEN) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 233 | return -1; |
| 234 | |
Harvey Harrison | d298487 | 2008-07-15 18:44:10 -0700 | [diff] [blame] | 235 | len = skb->len - hdrlen - WEP_IV_LEN - WEP_ICV_LEN; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 236 | |
| 237 | keyidx = skb->data[hdrlen + 3] >> 6; |
| 238 | |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 239 | if (!key || keyidx != key->conf.keyidx) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 240 | return -1; |
| 241 | |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 242 | klen = 3 + key->conf.keylen; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 243 | |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 244 | /* Prepend 24-bit IV to RC4 key */ |
| 245 | memcpy(rc4key, skb->data + hdrlen, 3); |
| 246 | |
| 247 | /* Copy rest of the WEP key (the secret part) */ |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 248 | memcpy(rc4key + 3, key->conf.key, key->conf.keylen); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 249 | |
| 250 | if (ieee80211_wep_decrypt_data(local->wep_rx_tfm, rc4key, klen, |
| 251 | skb->data + hdrlen + WEP_IV_LEN, |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 252 | len)) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 253 | ret = -1; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 254 | |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 255 | /* Trim ICV */ |
| 256 | skb_trim(skb, skb->len - WEP_ICV_LEN); |
| 257 | |
| 258 | /* Remove IV */ |
| 259 | memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen); |
| 260 | skb_pull(skb, WEP_IV_LEN); |
| 261 | |
| 262 | return ret; |
| 263 | } |
| 264 | |
| 265 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 266 | bool ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key) |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 267 | { |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 268 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 269 | unsigned int hdrlen; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 270 | u8 *ivpos; |
| 271 | u32 iv; |
| 272 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 273 | if (!ieee80211_has_protected(hdr->frame_control)) |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 274 | return false; |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 275 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 276 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 277 | ivpos = skb->data + hdrlen; |
| 278 | iv = (ivpos[0] << 16) | (ivpos[1] << 8) | ivpos[2]; |
| 279 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 280 | return ieee80211_wep_weak_iv(iv, key->conf.keylen); |
Jiri Benc | f0706e82 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 281 | } |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 282 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 283 | ieee80211_rx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 284 | ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx) |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 285 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 286 | struct sk_buff *skb = rx->skb; |
| 287 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 288 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 289 | |
| 290 | if (!ieee80211_is_data(hdr->frame_control) && |
| 291 | !ieee80211_is_auth(hdr->frame_control)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 292 | return RX_CONTINUE; |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 293 | |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 294 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 295 | if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 296 | return RX_DROP_UNUSABLE; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 297 | } else if (!(status->flag & RX_FLAG_IV_STRIPPED)) { |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 298 | ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key); |
| 299 | /* remove ICV */ |
Harvey Harrison | d298487 | 2008-07-15 18:44:10 -0700 | [diff] [blame] | 300 | skb_trim(rx->skb, rx->skb->len - WEP_ICV_LEN); |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 301 | } |
| 302 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 303 | return RX_CONTINUE; |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 304 | } |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 305 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 306 | static int wep_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 307 | { |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 308 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 309 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 310 | if (!info->control.hw_key) { |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 311 | if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key, |
| 312 | tx->key->conf.keylen, |
| 313 | tx->key->conf.keyidx)) |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 314 | return -1; |
John W. Linville | e4fca00 | 2010-01-22 12:33:09 -0500 | [diff] [blame] | 315 | } else if (info->control.hw_key->flags & |
| 316 | IEEE80211_KEY_FLAG_GENERATE_IV) { |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 317 | if (!ieee80211_wep_add_iv(tx->local, skb, |
| 318 | tx->key->conf.keylen, |
| 319 | tx->key->conf.keyidx)) |
| 320 | return -1; |
| 321 | } |
| 322 | |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 323 | return 0; |
| 324 | } |
| 325 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 326 | ieee80211_tx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 327 | ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx) |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 328 | { |
Johannes Berg | 2de8e0d | 2009-03-23 17:28:35 +0100 | [diff] [blame] | 329 | struct sk_buff *skb; |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 330 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 331 | ieee80211_tx_set_protected(tx); |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 332 | |
Johannes Berg | 252b86c | 2011-11-16 15:28:55 +0100 | [diff] [blame^] | 333 | skb_queue_walk(&tx->skbs, skb) { |
Johannes Berg | 2de8e0d | 2009-03-23 17:28:35 +0100 | [diff] [blame] | 334 | if (wep_encrypt_skb(tx, skb) < 0) { |
| 335 | I802_DEBUG_INC(tx->local->tx_handlers_drop_wep); |
| 336 | return TX_DROP; |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 337 | } |
Johannes Berg | 252b86c | 2011-11-16 15:28:55 +0100 | [diff] [blame^] | 338 | } |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 339 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 340 | return TX_CONTINUE; |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 341 | } |