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mac80211: move RX WEP weak IV counting

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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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);