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authorPablo Neira Ayuso <pablo@netfilter.org>2011-02-09 02:08:20 -0500
committerPatrick McHardy <kaber@trash.net>2011-02-09 02:08:20 -0500
commitc317428644c0af137d80069ab178cd797da3be45 (patch)
treebb862f2da8a291f6f46b0fb70f329529b1095586 /net
parent3db7e93d3308fb882884b9f024235d6fbf542034 (diff)
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>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_conntrack_core.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index e61511929c6..84f4fcc5884 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -942,8 +942,15 @@ nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
942 if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) 942 if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status))
943 nf_conntrack_event_cache(IPCT_REPLY, ct); 943 nf_conntrack_event_cache(IPCT_REPLY, ct);
944out: 944out:
945 if (tmpl) 945 if (tmpl) {
946 nf_ct_put(tmpl); 946 /* Special case: we have to repeat this hook, assign the
947 * template again to this packet. We assume that this packet
948 * has no conntrack assigned. This is used by nf_ct_tcp. */
949 if (ret == NF_REPEAT)
950 skb->nfct = (struct nf_conntrack *)tmpl;
951 else
952 nf_ct_put(tmpl);
953 }
947 954
948 return ret; 955 return ret;
949} 956}