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mac80211: move RX WEP weak IV counting 

This is better done inside the WEP decrypt
function where it doesn't have to check all
the conditions any more since they've been
tested already.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2012-03-12 13:49:13 +01:00 committed by John W. Linville
parent 6b6fa5868e
commit 617bbde878
3 changed files with 6 additions and 12 deletions
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7
net/mac80211/rx.c
View File

@ -1070,13 +1070,6 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
switch (rx->key->conf.cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
/* Check for weak IVs if possible */
if (rx->sta && ieee80211_is_data(fc) &&
(!(status->flag & RX_FLAG_IV_STRIPPED) ||
!(status->flag & RX_FLAG_DECRYPTED)) &&
ieee80211_wep_is_weak_iv(rx->skb, rx->key))
rx->sta->wep_weak_iv_count++;
result = ieee80211_crypto_wep_decrypt(rx);
break;
case WLAN_CIPHER_SUITE_TKIP:

10
net/mac80211/wep.c
View File

@ -263,16 +263,14 @@ static int ieee80211_wep_decrypt(struct ieee80211_local *local,
}
bool ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key)
static bool ieee80211_wep_is_weak_iv(struct sk_buff *skb,
struct ieee80211_key *key)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
unsigned int hdrlen;
u8 *ivpos;
u32 iv;
if (!ieee80211_has_protected(hdr->frame_control))
return false;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
ivpos = skb->data + hdrlen;
iv = (ivpos[0] << 16) | (ivpos[1] << 8) | ivpos[2];
@ -292,9 +290,13 @@ ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx)
return RX_CONTINUE;
if (!(status->flag & RX_FLAG_DECRYPTED)) {
if (rx->sta && ieee80211_wep_is_weak_iv(rx->skb, rx->key))
rx->sta->wep_weak_iv_count++;
if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key))
return RX_DROP_UNUSABLE;
} else if (!(status->flag & RX_FLAG_IV_STRIPPED)) {
if (rx->sta && ieee80211_wep_is_weak_iv(rx->skb, rx->key))
rx->sta->wep_weak_iv_count++;
ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
/* remove ICV */
skb_trim(rx->skb, rx->skb->len - WEP_ICV_LEN);

1
net/mac80211/wep.h
View File

@ -25,7 +25,6 @@ int ieee80211_wep_encrypt(struct ieee80211_local *local,
const u8 *key, int keylen, int keyidx);
int ieee80211_wep_decrypt_data(struct crypto_cipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len);
bool ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key);
ieee80211_rx_result
ieee80211_crypto_wep_decrypt(struct ieee80211_rx_data *rx);