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netfilter: conntrack: udp: only extend timeout to stream mode after 2s

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Currently DNS resolvers that send both A and AAAA queries from same source port
can trigger stream mode prematurely, which results in non-early-evictable conntrack entry
for three minutes, even though DNS requests are done in a few milliseconds.

Add a two second grace period where we continue to use the ordinary
30-second default timeout.  Its enough for DNS request/response traffic,
even if two request/reply packets are involved.

ASSURED is still set, else conntrack (and thus a possible
NAT mapping ...) gets zapped too in case conntrack table runs full.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal
2018-12-06 11:50:49 +01:00
committed by Pablo Neira Ayuso
parent 06aa151ad1
commit d535c8a69c
2 changed files with 18 additions and 3 deletions
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5
include/net/netfilter/nf_conntrack.h
View File

@@ -27,12 +27,17 @@
#include <net/netfilter/nf_conntrack_tuple.h>
struct nf_ct_udp {
unsigned long stream_ts;
};
/* per conntrack: protocol private data */
union nf_conntrack_proto {
/* insert conntrack proto private data here */
struct nf_ct_dccp dccp;
struct ip_ct_sctp sctp;
struct ip_ct_tcp tcp;
struct nf_ct_udp udp;
struct nf_ct_gre gre;
unsigned int tmpl_padto;
};