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netfilter: xtables: clean up xt_mac match routine

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Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
This commit is contained in:
Jan Engelhardt 2010-03-16 21:09:04 +01:00
parent 7d5f7ed802
commit 1d1c397db9
1 changed files with 9 additions and 7 deletions
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16
net/netfilter/xt_mac.c
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@ -26,14 +26,16 @@ MODULE_ALIAS("ip6t_mac");
static bool mac_mt(const struct sk_buff *skb, const struct xt_match_param *par)
{
const struct xt_mac_info *info = par->matchinfo;
const struct xt_mac_info *info = par->matchinfo;
bool ret;
/* Is mac pointer valid? */
return skb_mac_header(skb) >= skb->head &&
skb_mac_header(skb) + ETH_HLEN <= skb->data
/* If so, compare... */
&& ((!compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr))
^ info->invert);
if (skb_mac_header(skb) < skb->head)
return false;
if (skb_mac_header(skb) + ETH_HLEN > skb->data)
return false;
ret = compare_ether_addr(eth_hdr(skb)->h_source, info->srcaddr) == 0;
ret ^= info->invert;
return ret;
}
static struct xt_match mac_mt_reg __read_mostly = {