Commit c3174286 authored Feb 09, 2011 by Pablo Neira Ayuso Committed by Patrick McHardy Feb 09, 2011

netfilter: nf_conntrack: set conntrack templates again if we return NF_REPEAT



The TCP tracking code has a special case that allows to return
NF_REPEAT if we receive a new SYN packet while in TIME_WAIT state.

In this situation, the TCP tracking code destroys the existing
conntrack to start a new clean session.

[DESTROY] tcp      6 src=192.168.0.2 dst=192.168.1.2 sport=38925 dport=8000 src=192.168.1.2 dst=192.168.1.100 sport=8000 dport=38925 [ASSURED]
    [NEW] tcp      6 120 SYN_SENT src=192.168.0.2 dst=192.168.1.2 sport=38925 dport=8000 [UNREPLIED] src=192.168.1.2 dst=192.168.1.100 sport=8000 dport=38925

However, this is a problem for the iptables' CT target event filtering
which will not work in this case since the conntrack template will not
be there for the new session. To fix this, we reassign the conntrack
template to the packet if we return NF_REPEAT.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>

parent 3db7e93d

net/netfilter/nf_conntrack_core.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -942,8 +942,15 @@ nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
		if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
		nf_conntrack_event_cache(IPCT_REPLY, ct);
		out:
		if (tmpl)
		if (tmpl) {
		/* Special case: we have to repeat this hook, assign the
		* template again to this packet. We assume that this packet
		* has no conntrack assigned. This is used by nf_ct_tcp. */
		if (ret == NF_REPEAT)
		skb->nfct = (struct nf_conntrack *)tmpl;
		else
		nf_ct_put(tmpl);
		}

		return ret;
		}