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netfilter: nf_ct_ipv4: handle invalid IPv4 and IPv6 packets consistently 

IPv6 conntrack marked invalid packets as INVALID and let the user
drop those by an explicit rule, while IPv4 conntrack dropped such
packets itself.

IPv4 conntrack is changed so that it marks INVALID packets and let
the user to drop them.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Jozsef Kadlecsik 2012-04-09 16:32:16 +02:00 committed by Pablo Neira Ayuso
parent 95ad2f873d
commit 8430eac2f6
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
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@ -74,12 +74,12 @@ static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
if (iph == NULL)
return -NF_DROP;
return -NF_ACCEPT;
/* Conntrack defragments packets, we might still see fragments
* inside ICMP packets though. */
if (iph->frag_off & htons(IP_OFFSET))
return -NF_DROP;
return -NF_ACCEPT;
*dataoff = nhoff + (iph->ihl << 2);
*protonum = iph->protocol;