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-rw-r--r--package/mac80211/src/net/mac80211/wep.c373
1 files changed, 0 insertions, 373 deletions
diff --git a/package/mac80211/src/net/mac80211/wep.c b/package/mac80211/src/net/mac80211/wep.c
deleted file mode 100644
index a33ef5cfa9..0000000000
--- a/package/mac80211/src/net/mac80211/wep.c
+++ /dev/null
@@ -1,373 +0,0 @@
-/*
- * Software WEP encryption implementation
- * Copyright 2002, Jouni Malinen <jkmaline@cc.hut.fi>
- * Copyright 2003, Instant802 Networks, Inc.
- *
- * 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.
- */
-
-#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 <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, WEP_IV_LEN);
-
- local->wep_tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
- CRYPTO_ALG_ASYNC);
- if (IS_ERR(local->wep_tx_tfm))
- return -ENOMEM;
-
- local->wep_rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
- CRYPTO_ALG_ASYNC);
- if (IS_ERR(local->wep_rx_tfm)) {
- crypto_free_blkcipher(local->wep_tx_tfm);
- return -ENOMEM;
- }
-
- return 0;
-}
-
-void ieee80211_wep_free(struct ieee80211_local *local)
-{
- crypto_free_blkcipher(local->wep_tx_tfm);
- crypto_free_blkcipher(local->wep_rx_tfm);
-}
-
-static inline int 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 1;
- }
- return 0;
-}
-
-
-static void ieee80211_wep_get_iv(struct ieee80211_local *local,
- struct ieee80211_key *key, u8 *iv)
-{
- local->wep_iv++;
- if (ieee80211_wep_weak_iv(local->wep_iv, key->conf.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++ = key->conf.keyidx << 6;
-}
-
-
-static u8 *ieee80211_wep_add_iv(struct ieee80211_local *local,
- struct sk_buff *skb,
- struct ieee80211_key *key)
-{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- u16 fc;
- int hdrlen;
- u8 *newhdr;
-
- fc = le16_to_cpu(hdr->frame_control);
- fc |= IEEE80211_FCTL_PROTECTED;
- hdr->frame_control = cpu_to_le16(fc);
-
- if ((skb_headroom(skb) < WEP_IV_LEN ||
- skb_tailroom(skb) < WEP_ICV_LEN)) {
- I802_DEBUG_INC(local->tx_expand_skb_head);
- if (unlikely(pskb_expand_head(skb, WEP_IV_LEN, WEP_ICV_LEN,
- GFP_ATOMIC)))
- return NULL;
- }
-
- hdrlen = ieee80211_get_hdrlen(fc);
- newhdr = skb_push(skb, WEP_IV_LEN);
- memmove(newhdr, newhdr + WEP_IV_LEN, hdrlen);
- ieee80211_wep_get_iv(local, key, 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;
- u16 fc;
- int hdrlen;
-
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
- memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen);
- skb_pull(skb, 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)) */
-void ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
- size_t klen, u8 *data, size_t data_len)
-{
- struct blkcipher_desc desc = { .tfm = tfm };
- struct scatterlist sg;
- __le32 *icv;
-
- icv = (__le32 *)(data + data_len);
- *icv = cpu_to_le32(~crc32_le(~0, data, data_len));
-
- crypto_blkcipher_setkey(tfm, rc4key, klen);
- sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
- crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length);
-}
-
-
-/* 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,
- struct ieee80211_key *key)
-{
- u32 klen;
- u8 *rc4key, *iv;
- size_t len;
-
- if (!key || key->conf.alg != ALG_WEP)
- return -1;
-
- klen = 3 + key->conf.keylen;
- rc4key = kmalloc(klen, GFP_ATOMIC);
- if (!rc4key)
- return -1;
-
- iv = ieee80211_wep_add_iv(local, skb, key);
- if (!iv) {
- kfree(rc4key);
- return -1;
- }
-
- len = skb->len - (iv + 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->conf.key, key->conf.keylen);
-
- /* Add room for ICV */
- skb_put(skb, WEP_ICV_LEN);
-
- ieee80211_wep_encrypt_data(local->wep_tx_tfm, rc4key, klen,
- iv + WEP_IV_LEN, len);
-
- kfree(rc4key);
-
- return 0;
-}
-
-
-/* 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 crypto_blkcipher *tfm, u8 *rc4key,
- size_t klen, u8 *data, size_t data_len)
-{
- struct blkcipher_desc desc = { .tfm = tfm };
- struct scatterlist sg;
- __le32 crc;
-
- crypto_blkcipher_setkey(tfm, rc4key, klen);
- sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
- crypto_blkcipher_decrypt(&desc, &sg, &sg, sg.length);
-
- crc = cpu_to_le32(~crc32_le(~0, data, data_len));
- if (memcmp(&crc, data + data_len, 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.
- */
-int ieee80211_wep_decrypt(struct ieee80211_local *local, struct sk_buff *skb,
- struct ieee80211_key *key)
-{
- u32 klen;
- u8 *rc4key;
- u8 keyidx;
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- u16 fc;
- int hdrlen;
- size_t len;
- int ret = 0;
-
- fc = le16_to_cpu(hdr->frame_control);
- if (!(fc & IEEE80211_FCTL_PROTECTED))
- return -1;
-
- hdrlen = ieee80211_get_hdrlen(fc);
-
- if (skb->len < 8 + hdrlen)
- return -1;
-
- len = skb->len - hdrlen - 8;
-
- keyidx = skb->data[hdrlen + 3] >> 6;
-
- if (!key || keyidx != key->conf.keyidx || key->conf.alg != ALG_WEP)
- return -1;
-
- klen = 3 + key->conf.keylen;
-
- rc4key = kmalloc(klen, GFP_ATOMIC);
- if (!rc4key)
- return -1;
-
- /* 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_tfm, rc4key, klen,
- skb->data + hdrlen + WEP_IV_LEN,
- len)) {
- if (net_ratelimit())
- printk(KERN_DEBUG "WEP decrypt failed (ICV)\n");
- ret = -1;
- }
-
- kfree(rc4key);
-
- /* Trim ICV */
- skb_trim(skb, skb->len - WEP_ICV_LEN);
-
- /* Remove IV */
- memmove(skb->data + WEP_IV_LEN, skb->data, hdrlen);
- skb_pull(skb, WEP_IV_LEN);
-
- return ret;
-}
-
-
-u8 * ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key)
-{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- u16 fc;
- int hdrlen;
- u8 *ivpos;
- u32 iv;
-
- fc = le16_to_cpu(hdr->frame_control);
- if (!(fc & IEEE80211_FCTL_PROTECTED))
- return NULL;
-
- hdrlen = ieee80211_get_hdrlen(fc);
- ivpos = skb->data + hdrlen;
- iv = (ivpos[0] << 16) | (ivpos[1] << 8) | ivpos[2];
-
- if (ieee80211_wep_weak_iv(iv, key->conf.keylen))
- return ivpos;
-
- return NULL;
-}
-
-ieee80211_rx_result
-ieee80211_crypto_wep_decrypt(struct ieee80211_txrx_data *rx)
-{
- if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
- ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
- (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))
- return RX_CONTINUE;
-
- if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
- if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
-#ifdef CONFIG_MAC80211_DEBUG
- if (net_ratelimit())
- printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
- "failed\n", rx->dev->name);
-#endif /* CONFIG_MAC80211_DEBUG */
- return RX_DROP_UNUSABLE;
- }
- } else if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) {
- ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
- /* remove ICV */
- skb_trim(rx->skb, rx->skb->len - 4);
- }
-
- return RX_CONTINUE;
-}
-
-static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
-{
- if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
- if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
- return -1;
- } else {
- tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
- if (tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) {
- if (!ieee80211_wep_add_iv(tx->local, skb, tx->key))
- return -1;
- }
- }
- return 0;
-}
-
-ieee80211_tx_result
-ieee80211_crypto_wep_encrypt(struct ieee80211_txrx_data *tx)
-{
- tx->u.tx.control->iv_len = WEP_IV_LEN;
- tx->u.tx.control->icv_len = WEP_ICV_LEN;
- ieee80211_tx_set_iswep(tx);
-
- if (wep_encrypt_skb(tx, tx->skb) < 0) {
- I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
- return TX_DROP;
- }
-
- if (tx->u.tx.extra_frag) {
- int i;
- for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
- if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
- I802_DEBUG_INC(tx->local->
- tx_handlers_drop_wep);
- return TX_DROP;
- }
- }
- }
-
- return TX_CONTINUE;
-}
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