diff options
| author | Florian Westphal <fw@strlen.de> | 2018-12-06 11:50:49 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-12-21 00:48:38 +0100 |
| commit | d535c8a69c1924e70186d80be0a9cecaf475f166 (patch) | |
| tree | 8934ce1d48533bcf4f40c3381bd3630d6189e9f0 /include/net | |
| parent | 06aa151ad1fc74a49b45336672515774a678d78d (diff) | |
netfilter: conntrack: udp: only extend timeout to stream mode after 2s
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>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/netfilter/nf_conntrack.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h index 7e012312cd61..249d0a5b12b8 100644 --- a/include/net/netfilter/nf_conntrack.h +++ b/include/net/netfilter/nf_conntrack.h @@ -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; }; |