From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/net/wireless/lib80211_crypt_wep.c | 289 +++++++++++++++++++++++++++++++ 1 file changed, 289 insertions(+) create mode 100644 kernel/net/wireless/lib80211_crypt_wep.c (limited to 'kernel/net/wireless/lib80211_crypt_wep.c') diff --git a/kernel/net/wireless/lib80211_crypt_wep.c b/kernel/net/wireless/lib80211_crypt_wep.c new file mode 100644 index 000000000..1c292e4ea --- /dev/null +++ b/kernel/net/wireless/lib80211_crypt_wep.c @@ -0,0 +1,289 @@ +/* + * lib80211 crypt: host-based WEP encryption implementation for lib80211 + * + * Copyright (c) 2002-2004, Jouni Malinen + * Copyright (c) 2008, John W. Linville + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. See README and COPYING for + * more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include + +MODULE_AUTHOR("Jouni Malinen"); +MODULE_DESCRIPTION("lib80211 crypt: WEP"); +MODULE_LICENSE("GPL"); + +struct lib80211_wep_data { + u32 iv; +#define WEP_KEY_LEN 13 + u8 key[WEP_KEY_LEN + 1]; + u8 key_len; + u8 key_idx; + struct crypto_blkcipher *tx_tfm; + struct crypto_blkcipher *rx_tfm; +}; + +static void *lib80211_wep_init(int keyidx) +{ + struct lib80211_wep_data *priv; + + priv = kzalloc(sizeof(*priv), GFP_ATOMIC); + if (priv == NULL) + goto fail; + priv->key_idx = keyidx; + + priv->tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(priv->tx_tfm)) { + priv->tx_tfm = NULL; + goto fail; + } + + priv->rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(priv->rx_tfm)) { + priv->rx_tfm = NULL; + goto fail; + } + /* start WEP IV from a random value */ + get_random_bytes(&priv->iv, 4); + + return priv; + + fail: + if (priv) { + if (priv->tx_tfm) + crypto_free_blkcipher(priv->tx_tfm); + if (priv->rx_tfm) + crypto_free_blkcipher(priv->rx_tfm); + kfree(priv); + } + return NULL; +} + +static void lib80211_wep_deinit(void *priv) +{ + struct lib80211_wep_data *_priv = priv; + if (_priv) { + if (_priv->tx_tfm) + crypto_free_blkcipher(_priv->tx_tfm); + if (_priv->rx_tfm) + crypto_free_blkcipher(_priv->rx_tfm); + } + kfree(priv); +} + +/* Add WEP IV/key info to a frame that has at least 4 bytes of headroom */ +static int lib80211_wep_build_iv(struct sk_buff *skb, int hdr_len, + u8 *key, int keylen, void *priv) +{ + struct lib80211_wep_data *wep = priv; + u32 klen; + u8 *pos; + + if (skb_headroom(skb) < 4 || skb->len < hdr_len) + return -1; + + pos = skb_push(skb, 4); + memmove(pos, pos + 4, hdr_len); + pos += hdr_len; + + klen = 3 + wep->key_len; + + wep->iv++; + + /* 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 ((wep->iv & 0xff00) == 0xff00) { + u8 B = (wep->iv >> 16) & 0xff; + if (B >= 3 && B < klen) + wep->iv += 0x0100; + } + + /* Prepend 24-bit IV to RC4 key and TX frame */ + *pos++ = (wep->iv >> 16) & 0xff; + *pos++ = (wep->iv >> 8) & 0xff; + *pos++ = wep->iv & 0xff; + *pos++ = wep->key_idx << 6; + + return 0; +} + +/* Perform WEP encryption on given skb that has at least 4 bytes of headroom + * for IV and 4 bytes of tailroom for ICV. 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)) + */ +static int lib80211_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv) +{ + struct lib80211_wep_data *wep = priv; + struct blkcipher_desc desc = { .tfm = wep->tx_tfm }; + u32 crc, klen, len; + u8 *pos, *icv; + struct scatterlist sg; + u8 key[WEP_KEY_LEN + 3]; + + /* other checks are in lib80211_wep_build_iv */ + if (skb_tailroom(skb) < 4) + return -1; + + /* add the IV to the frame */ + if (lib80211_wep_build_iv(skb, hdr_len, NULL, 0, priv)) + return -1; + + /* Copy the IV into the first 3 bytes of the key */ + skb_copy_from_linear_data_offset(skb, hdr_len, key, 3); + + /* Copy rest of the WEP key (the secret part) */ + memcpy(key + 3, wep->key, wep->key_len); + + len = skb->len - hdr_len - 4; + pos = skb->data + hdr_len + 4; + klen = 3 + wep->key_len; + + /* Append little-endian CRC32 over only the data and encrypt it to produce ICV */ + crc = ~crc32_le(~0, pos, len); + icv = skb_put(skb, 4); + icv[0] = crc; + icv[1] = crc >> 8; + icv[2] = crc >> 16; + icv[3] = crc >> 24; + + crypto_blkcipher_setkey(wep->tx_tfm, key, klen); + sg_init_one(&sg, pos, len + 4); + return crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4); +} + +/* Perform WEP decryption on given buffer. Buffer includes whole WEP part of + * the frame: IV (4 bytes), encrypted payload (including SNAP header), + * ICV (4 bytes). 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. + */ +static int lib80211_wep_decrypt(struct sk_buff *skb, int hdr_len, void *priv) +{ + struct lib80211_wep_data *wep = priv; + struct blkcipher_desc desc = { .tfm = wep->rx_tfm }; + u32 crc, klen, plen; + u8 key[WEP_KEY_LEN + 3]; + u8 keyidx, *pos, icv[4]; + struct scatterlist sg; + + if (skb->len < hdr_len + 8) + return -1; + + pos = skb->data + hdr_len; + key[0] = *pos++; + key[1] = *pos++; + key[2] = *pos++; + keyidx = *pos++ >> 6; + if (keyidx != wep->key_idx) + return -1; + + klen = 3 + wep->key_len; + + /* Copy rest of the WEP key (the secret part) */ + memcpy(key + 3, wep->key, wep->key_len); + + /* Apply RC4 to data and compute CRC32 over decrypted data */ + plen = skb->len - hdr_len - 8; + + crypto_blkcipher_setkey(wep->rx_tfm, key, klen); + sg_init_one(&sg, pos, plen + 4); + if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) + return -7; + + crc = ~crc32_le(~0, pos, plen); + icv[0] = crc; + icv[1] = crc >> 8; + icv[2] = crc >> 16; + icv[3] = crc >> 24; + if (memcmp(icv, pos + plen, 4) != 0) { + /* ICV mismatch - drop frame */ + return -2; + } + + /* Remove IV and ICV */ + memmove(skb->data + 4, skb->data, hdr_len); + skb_pull(skb, 4); + skb_trim(skb, skb->len - 4); + + return 0; +} + +static int lib80211_wep_set_key(void *key, int len, u8 * seq, void *priv) +{ + struct lib80211_wep_data *wep = priv; + + if (len < 0 || len > WEP_KEY_LEN) + return -1; + + memcpy(wep->key, key, len); + wep->key_len = len; + + return 0; +} + +static int lib80211_wep_get_key(void *key, int len, u8 * seq, void *priv) +{ + struct lib80211_wep_data *wep = priv; + + if (len < wep->key_len) + return -1; + + memcpy(key, wep->key, wep->key_len); + + return wep->key_len; +} + +static void lib80211_wep_print_stats(struct seq_file *m, void *priv) +{ + struct lib80211_wep_data *wep = priv; + seq_printf(m, "key[%d] alg=WEP len=%d\n", wep->key_idx, wep->key_len); +} + +static struct lib80211_crypto_ops lib80211_crypt_wep = { + .name = "WEP", + .init = lib80211_wep_init, + .deinit = lib80211_wep_deinit, + .encrypt_mpdu = lib80211_wep_encrypt, + .decrypt_mpdu = lib80211_wep_decrypt, + .encrypt_msdu = NULL, + .decrypt_msdu = NULL, + .set_key = lib80211_wep_set_key, + .get_key = lib80211_wep_get_key, + .print_stats = lib80211_wep_print_stats, + .extra_mpdu_prefix_len = 4, /* IV */ + .extra_mpdu_postfix_len = 4, /* ICV */ + .owner = THIS_MODULE, +}; + +static int __init lib80211_crypto_wep_init(void) +{ + return lib80211_register_crypto_ops(&lib80211_crypt_wep); +} + +static void __exit lib80211_crypto_wep_exit(void) +{ + lib80211_unregister_crypto_ops(&lib80211_crypt_wep); +} + +module_init(lib80211_crypto_wep_init); +module_exit(lib80211_crypto_wep_exit); -- cgit 1.2.3-korg