Jiri Benc | f0706e8 | 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 | f0706e8 | 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 | |
| 33 | local->wep_tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0, |
| 34 | CRYPTO_ALG_ASYNC); |
John W. Linville | 088c872 | 2010-07-15 16:16:17 -0400 | [diff] [blame] | 35 | if (IS_ERR(local->wep_tx_tfm)) { |
| 36 | local->wep_rx_tfm = ERR_PTR(-EINVAL); |
Jeremy Fitzhardinge | 023a04b | 2008-07-14 12:52:08 -0700 | [diff] [blame] | 37 | return PTR_ERR(local->wep_tx_tfm); |
John W. Linville | 088c872 | 2010-07-15 16:16:17 -0400 | [diff] [blame] | 38 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 39 | |
| 40 | local->wep_rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0, |
| 41 | CRYPTO_ALG_ASYNC); |
| 42 | if (IS_ERR(local->wep_rx_tfm)) { |
| 43 | crypto_free_blkcipher(local->wep_tx_tfm); |
John W. Linville | 088c872 | 2010-07-15 16:16:17 -0400 | [diff] [blame] | 44 | local->wep_tx_tfm = ERR_PTR(-EINVAL); |
Jeremy Fitzhardinge | 023a04b | 2008-07-14 12:52:08 -0700 | [diff] [blame] | 45 | return PTR_ERR(local->wep_rx_tfm); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | void ieee80211_wep_free(struct ieee80211_local *local) |
| 52 | { |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 53 | if (!IS_ERR(local->wep_tx_tfm)) |
| 54 | crypto_free_blkcipher(local->wep_tx_tfm); |
| 55 | if (!IS_ERR(local->wep_rx_tfm)) |
| 56 | crypto_free_blkcipher(local->wep_rx_tfm); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 57 | } |
| 58 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 59 | static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 60 | { |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 61 | /* |
| 62 | * Fluhrer, Mantin, and Shamir have reported weaknesses in the |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 63 | * key scheduling algorithm of RC4. At least IVs (KeyByte + 3, |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 64 | * 0xff, N) can be used to speedup attacks, so avoid using them. |
| 65 | */ |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 66 | if ((iv & 0xff00) == 0xff00) { |
| 67 | u8 B = (iv >> 16) & 0xff; |
| 68 | if (B >= 3 && B < 3 + keylen) |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 69 | return true; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 70 | } |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 71 | return false; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 75 | static void ieee80211_wep_get_iv(struct ieee80211_local *local, |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 76 | int keylen, int keyidx, u8 *iv) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 77 | { |
| 78 | local->wep_iv++; |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 79 | if (ieee80211_wep_weak_iv(local->wep_iv, keylen)) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 80 | local->wep_iv += 0x0100; |
| 81 | |
| 82 | if (!iv) |
| 83 | return; |
| 84 | |
| 85 | *iv++ = (local->wep_iv >> 16) & 0xff; |
| 86 | *iv++ = (local->wep_iv >> 8) & 0xff; |
| 87 | *iv++ = local->wep_iv & 0xff; |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 88 | *iv++ = keyidx << 6; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 92 | static u8 *ieee80211_wep_add_iv(struct ieee80211_local *local, |
| 93 | struct sk_buff *skb, |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 94 | int keylen, int keyidx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 95 | { |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 96 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 97 | unsigned int hdrlen; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 98 | u8 *newhdr; |
| 99 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 100 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 101 | |
Johannes Berg | 23c0752 | 2008-05-29 10:38:53 +0200 | [diff] [blame] | 102 | if (WARN_ON(skb_tailroom(skb) < WEP_ICV_LEN || |
| 103 | skb_headroom(skb) < WEP_IV_LEN)) |
| 104 | return NULL; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 105 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 106 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 107 | newhdr = skb_push(skb, WEP_IV_LEN); |
| 108 | memmove(newhdr, newhdr + WEP_IV_LEN, hdrlen); |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 109 | ieee80211_wep_get_iv(local, keylen, keyidx, newhdr + hdrlen); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 110 | return newhdr + hdrlen; |
| 111 | } |
| 112 | |
| 113 | |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 114 | static void ieee80211_wep_remove_iv(struct ieee80211_local *local, |
| 115 | struct sk_buff *skb, |
| 116 | struct ieee80211_key *key) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 117 | { |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 118 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 119 | unsigned int hdrlen; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 120 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 121 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 122 | memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen); |
| 123 | skb_pull(skb, WEP_IV_LEN); |
| 124 | } |
| 125 | |
| 126 | |
| 127 | /* Perform WEP encryption using given key. data buffer must have tailroom |
| 128 | * for 4-byte ICV. data_len must not include this ICV. Note: this function |
| 129 | * does _not_ add IV. data = RC4(data | CRC32(data)) */ |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 130 | int ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key, |
| 131 | size_t klen, u8 *data, size_t data_len) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 132 | { |
| 133 | struct blkcipher_desc desc = { .tfm = tfm }; |
| 134 | struct scatterlist sg; |
Ivan Kuten | 860c6e6 | 2008-11-24 15:17:54 -0500 | [diff] [blame] | 135 | __le32 icv; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 136 | |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 137 | if (IS_ERR(tfm)) |
| 138 | return -1; |
| 139 | |
Ivan Kuten | 860c6e6 | 2008-11-24 15:17:54 -0500 | [diff] [blame] | 140 | icv = cpu_to_le32(~crc32_le(~0, data, data_len)); |
| 141 | put_unaligned(icv, (__le32 *)(data + data_len)); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 142 | |
| 143 | crypto_blkcipher_setkey(tfm, rc4key, klen); |
Jens Axboe | fa05f12 | 2007-10-22 19:44:26 +0200 | [diff] [blame] | 144 | sg_init_one(&sg, data, data_len + WEP_ICV_LEN); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 145 | crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length); |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 146 | |
| 147 | return 0; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | |
| 151 | /* Perform WEP encryption on given skb. 4 bytes of extra space (IV) in the |
| 152 | * beginning of the buffer 4 bytes of extra space (ICV) in the end of the |
| 153 | * buffer will be added. Both IV and ICV will be transmitted, so the |
| 154 | * payload length increases with 8 bytes. |
| 155 | * |
| 156 | * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data)) |
| 157 | */ |
Johannes Berg | fffd093 | 2009-07-08 14:22:54 +0200 | [diff] [blame] | 158 | int ieee80211_wep_encrypt(struct ieee80211_local *local, |
| 159 | struct sk_buff *skb, |
| 160 | const u8 *key, int keylen, int keyidx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 161 | { |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 162 | u8 *iv; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 163 | size_t len; |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 164 | u8 rc4key[3 + WLAN_KEY_LEN_WEP104]; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 165 | |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 166 | iv = ieee80211_wep_add_iv(local, skb, keylen, keyidx); |
| 167 | if (!iv) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 168 | return -1; |
| 169 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 170 | len = skb->len - (iv + WEP_IV_LEN - skb->data); |
| 171 | |
| 172 | /* Prepend 24-bit IV to RC4 key */ |
| 173 | memcpy(rc4key, iv, 3); |
| 174 | |
| 175 | /* Copy rest of the WEP key (the secret part) */ |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 176 | memcpy(rc4key + 3, key, keylen); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 177 | |
| 178 | /* Add room for ICV */ |
| 179 | skb_put(skb, WEP_ICV_LEN); |
| 180 | |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 181 | return ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, keylen + 3, |
| 182 | iv + WEP_IV_LEN, len); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | |
| 186 | /* Perform WEP decryption using given key. data buffer includes encrypted |
| 187 | * payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV. |
| 188 | * Return 0 on success and -1 on ICV mismatch. */ |
| 189 | int ieee80211_wep_decrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key, |
| 190 | size_t klen, u8 *data, size_t data_len) |
| 191 | { |
| 192 | struct blkcipher_desc desc = { .tfm = tfm }; |
| 193 | struct scatterlist sg; |
| 194 | __le32 crc; |
| 195 | |
John W. Linville | 3473187 | 2010-07-07 15:07:49 -0400 | [diff] [blame] | 196 | if (IS_ERR(tfm)) |
| 197 | return -1; |
| 198 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 199 | crypto_blkcipher_setkey(tfm, rc4key, klen); |
Jens Axboe | fa05f12 | 2007-10-22 19:44:26 +0200 | [diff] [blame] | 200 | sg_init_one(&sg, data, data_len + WEP_ICV_LEN); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 201 | crypto_blkcipher_decrypt(&desc, &sg, &sg, sg.length); |
| 202 | |
| 203 | crc = cpu_to_le32(~crc32_le(~0, data, data_len)); |
| 204 | if (memcmp(&crc, data + data_len, WEP_ICV_LEN) != 0) |
| 205 | /* ICV mismatch */ |
| 206 | return -1; |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | |
| 212 | /* Perform WEP decryption on given skb. Buffer includes whole WEP part of |
| 213 | * the frame: IV (4 bytes), encrypted payload (including SNAP header), |
| 214 | * ICV (4 bytes). skb->len includes both IV and ICV. |
| 215 | * |
| 216 | * Returns 0 if frame was decrypted successfully and ICV was correct and -1 on |
| 217 | * failure. If frame is OK, IV and ICV will be removed, i.e., decrypted payload |
| 218 | * is moved to the beginning of the skb and skb length will be reduced. |
| 219 | */ |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 220 | static int ieee80211_wep_decrypt(struct ieee80211_local *local, |
| 221 | struct sk_buff *skb, |
| 222 | struct ieee80211_key *key) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 223 | { |
| 224 | u32 klen; |
Johannes Berg | 730bd83 | 2010-10-10 18:52:10 +0200 | [diff] [blame] | 225 | u8 rc4key[3 + WLAN_KEY_LEN_WEP104]; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 226 | u8 keyidx; |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 227 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 228 | unsigned int hdrlen; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 229 | size_t len; |
| 230 | int ret = 0; |
| 231 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 232 | if (!ieee80211_has_protected(hdr->frame_control)) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 233 | return -1; |
| 234 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 235 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Harvey Harrison | d298487 | 2008-07-15 18:44:10 -0700 | [diff] [blame] | 236 | if (skb->len < hdrlen + WEP_IV_LEN + WEP_ICV_LEN) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 237 | return -1; |
| 238 | |
Harvey Harrison | d298487 | 2008-07-15 18:44:10 -0700 | [diff] [blame] | 239 | len = skb->len - hdrlen - WEP_IV_LEN - WEP_ICV_LEN; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 240 | |
| 241 | keyidx = skb->data[hdrlen + 3] >> 6; |
| 242 | |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 243 | if (!key || keyidx != key->conf.keyidx) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 244 | return -1; |
| 245 | |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 246 | klen = 3 + key->conf.keylen; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 247 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 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) */ |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 252 | memcpy(rc4key + 3, key->conf.key, key->conf.keylen); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 253 | |
| 254 | if (ieee80211_wep_decrypt_data(local->wep_rx_tfm, rc4key, klen, |
| 255 | skb->data + hdrlen + WEP_IV_LEN, |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 256 | len)) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 257 | ret = -1; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 258 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 259 | /* Trim ICV */ |
| 260 | skb_trim(skb, skb->len - WEP_ICV_LEN); |
| 261 | |
| 262 | /* Remove IV */ |
| 263 | memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen); |
| 264 | skb_pull(skb, WEP_IV_LEN); |
| 265 | |
| 266 | return ret; |
| 267 | } |
| 268 | |
| 269 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 270 | bool ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 271 | { |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 272 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 273 | unsigned int hdrlen; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 274 | u8 *ivpos; |
| 275 | u32 iv; |
| 276 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 277 | if (!ieee80211_has_protected(hdr->frame_control)) |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 278 | return false; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 279 | |
Harvey Harrison | 70217d7 | 2008-06-22 16:45:23 -0700 | [diff] [blame] | 280 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 281 | ivpos = skb->data + hdrlen; |
| 282 | iv = (ivpos[0] << 16) | (ivpos[1] << 8) | ivpos[2]; |
| 283 | |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 284 | return ieee80211_wep_weak_iv(iv, key->conf.keylen); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 285 | } |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 286 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 287 | ieee80211_rx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 288 | ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx) |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 289 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 290 | struct sk_buff *skb = rx->skb; |
| 291 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 292 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 293 | |
| 294 | if (!ieee80211_is_data(hdr->frame_control) && |
| 295 | !ieee80211_is_auth(hdr->frame_control)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 296 | return RX_CONTINUE; |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 297 | |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 298 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 299 | if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 300 | return RX_DROP_UNUSABLE; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 301 | } else if (!(status->flag & RX_FLAG_IV_STRIPPED)) { |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 302 | ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key); |
| 303 | /* remove ICV */ |
Harvey Harrison | d298487 | 2008-07-15 18:44:10 -0700 | [diff] [blame] | 304 | skb_trim(rx->skb, rx->skb->len - WEP_ICV_LEN); |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 305 | } |
| 306 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 307 | return RX_CONTINUE; |
Johannes Berg | 4f0d18e | 2007-09-26 15:19:40 +0200 | [diff] [blame] | 308 | } |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 309 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 310 | 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] | 311 | { |
Johannes Berg | e039fa4 | 2008-05-15 12:55:29 +0200 | [diff] [blame] | 312 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 313 | |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 314 | if (!info->control.hw_key) { |
Johannes Berg | c9cf012 | 2009-07-07 03:45:18 +0200 | [diff] [blame] | 315 | if (ieee80211_wep_encrypt(tx->local, skb, tx->key->conf.key, |
| 316 | tx->key->conf.keylen, |
| 317 | tx->key->conf.keyidx)) |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 318 | return -1; |
John W. Linville | e4fca00 | 2010-01-22 12:33:09 -0500 | [diff] [blame] | 319 | } else if (info->control.hw_key->flags & |
| 320 | IEEE80211_KEY_FLAG_GENERATE_IV) { |
Johannes Berg | 813d766 | 2010-01-17 01:47:58 +0100 | [diff] [blame] | 321 | if (!ieee80211_wep_add_iv(tx->local, skb, |
| 322 | tx->key->conf.keylen, |
| 323 | tx->key->conf.keyidx)) |
| 324 | return -1; |
| 325 | } |
| 326 | |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 327 | return 0; |
| 328 | } |
| 329 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 330 | ieee80211_tx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 331 | ieee80211_crypto_wep_encrypt(struct ieee80211_tx_data *tx) |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 332 | { |
Johannes Berg | 2de8e0d | 2009-03-23 17:28:35 +0100 | [diff] [blame] | 333 | struct sk_buff *skb; |
Johannes Berg | c6a1fa1 | 2008-10-07 12:04:32 +0200 | [diff] [blame] | 334 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 335 | ieee80211_tx_set_protected(tx); |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 336 | |
Johannes Berg | 2de8e0d | 2009-03-23 17:28:35 +0100 | [diff] [blame] | 337 | skb = tx->skb; |
| 338 | do { |
| 339 | if (wep_encrypt_skb(tx, skb) < 0) { |
| 340 | I802_DEBUG_INC(tx->local->tx_handlers_drop_wep); |
| 341 | return TX_DROP; |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 342 | } |
Johannes Berg | 2de8e0d | 2009-03-23 17:28:35 +0100 | [diff] [blame] | 343 | } while ((skb = skb->next)); |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 344 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 345 | return TX_CONTINUE; |
Johannes Berg | 6a22a59 | 2007-09-26 15:19:41 +0200 | [diff] [blame] | 346 | } |