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[PATCH] mac80211: consolidate decryption

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Currently, we run through all three crypto algorithms for each
received frame even though we have previously determined which
key we have and as such already know which algorithm will be
used. Change it to invoke only the needed function. Also move
the WEP decrypt handler to wep.c so that fewer functions need
to be non-static.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2007-09-26 15:19:40 +02:00
committed by David S. Miller
parent b2e7771e55
commit 4f0d18e26f
5 changed files with 55 additions and 43 deletions
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34
net/mac80211/wep.c
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@ -63,8 +63,8 @@ static inline int ieee80211_wep_weak_iv(u32 iv, int keylen)
}
void ieee80211_wep_get_iv(struct ieee80211_local *local,
struct ieee80211_key *key, u8 *iv)
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))
@ -109,9 +109,9 @@ u8 * ieee80211_wep_add_iv(struct ieee80211_local *local,
}
void ieee80211_wep_remove_iv(struct ieee80211_local *local,
struct sk_buff *skb,
struct ieee80211_key *key)
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;
@ -326,3 +326,27 @@ u8 * ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key)
return NULL;
}
ieee80211_txrx_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 TXRX_CONTINUE;
if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
if (net_ratelimit())
printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
"failed\n", rx->dev->name);
return TXRX_DROP;
}
} 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 TXRX_CONTINUE;
}