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[MAC80211]: consolidate decryption more

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Currently, we have three RX handlers doing the decryption.
This patch changes it to have only one handler doing
everything, thereby getting rid of many duplicate checks.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
--
 net/mac80211/rx.c |   46 ++++++++++++----------------------------------
 1 files changed, 12 insertions(+), 34 deletions(-)
This commit is contained in:
Johannes Berg 2007-09-26 17:53:15 +02:00 committed by David S. Miller
parent 70f0876579
commit 1990af8d14
1 changed files with 12 additions and 34 deletions
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46
net/mac80211/rx.c
View File

@ -419,7 +419,7 @@ ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
static ieee80211_txrx_result
ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
int keyidx;
@ -456,7 +456,7 @@ ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
return TXRX_CONTINUE;
/*
* No point in finding a key if the frame is neither
* No point in finding a key and decrypting if the frame is neither
* addressed to us nor a multicast frame.
*/
if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
@ -507,42 +507,21 @@ ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
if (rx->key) {
rx->key->tx_rx_count++;
/* TODO: add threshold stuff again */
}
return TXRX_CONTINUE;
}
static ieee80211_txrx_result
ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
{
if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
(rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
!rx->key || rx->key->conf.alg != ALG_WEP ||
!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
return TXRX_CONTINUE;
/* Check for weak IVs, if hwaccel did not remove IV from the frame */
if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED))
if (ieee80211_wep_is_weak_iv(rx->skb, rx->key))
rx->sta->wep_weak_iv_count++;
return TXRX_CONTINUE;
}
static ieee80211_txrx_result
ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
{
if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
return TXRX_CONTINUE;
if (!rx->key) {
} else {
if (net_ratelimit())
printk(KERN_DEBUG "%s: RX protected frame,"
" but have no key\n", rx->dev->name);
return TXRX_DROP;
}
/* Check for weak IVs if possible */
if (rx->sta && rx->key->conf.alg == ALG_WEP &&
((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
(!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) ||
!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) &&
ieee80211_wep_is_weak_iv(rx->skb, rx->key))
rx->sta->wep_weak_iv_count++;
switch (rx->key->conf.alg) {
case ALG_WEP:
return ieee80211_crypto_wep_decrypt(rx);
@ -551,6 +530,7 @@ ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
case ALG_CCMP:
return ieee80211_crypto_ccmp_decrypt(rx);
case ALG_NONE:
WARN_ON(1);
return TXRX_CONTINUE;
}
@ -1348,8 +1328,6 @@ ieee80211_rx_handler ieee80211_rx_handlers[] =
ieee80211_rx_h_if_stats,
ieee80211_rx_h_passive_scan,
ieee80211_rx_h_check,
ieee80211_rx_h_load_key,
ieee80211_rx_h_wep_weak_iv_detection,
ieee80211_rx_h_decrypt,
ieee80211_rx_h_sta_process,
ieee80211_rx_h_defragment,