From e5042a290097b7c2fc9b6a247585b6ed07b13026 Mon Sep 17 00:00:00 2001 From: Jan Engelhardt Date: Tue, 16 Mar 2010 21:44:44 +0100 Subject: [PATCH] netfilter: xtables: limit xt_mac to ethernet devices I do not see a point of allowing the MAC module to work with devices that don't possibly have one, e.g. various tunnel interfaces such as tun and sit. Signed-off-by: Jan Engelhardt --- net/netfilter/xt_mac.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/xt_mac.c b/net/netfilter/xt_mac.c index 2039d0741b37..b971ce93773e 100644 --- a/net/netfilter/xt_mac.c +++ b/net/netfilter/xt_mac.c @@ -10,6 +10,7 @@ #include #include +#include #include #include @@ -29,6 +30,8 @@ static bool mac_mt(const struct sk_buff *skb, const struct xt_match_param *par) const struct xt_mac_info *info = par->matchinfo; bool ret; + if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER) + return false; if (skb_mac_header(skb) < skb->head) return false; if (skb_mac_header(skb) + ETH_HLEN > skb->data) -- 2.20.1