diff options
| author | Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | 2018-04-21 13:43:48 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-04-27 00:39:29 +0200 |
| commit | 72d4d3e3980702809509586d36015b7c3c51fad4 (patch) | |
| tree | 0b50708c4b2c4183f0230ba603393ecd8a85145a /include | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf (diff) | |
| download | linux-72d4d3e3980702809509586d36015b7c3c51fad4.tar.xz linux-72d4d3e3980702809509586d36015b7c3c51fad4.zip | |
netfilter: Fix handling simultaneous open in TCP conntrack
Dominique Martinet reported a TCP hang problem when simultaneous open was used.
The problem is that the tcp_conntracks state table is not smart enough
to handle the case. The state table could be fixed by introducing a new state,
but that would require more lines of code compared to this patch, due to the
required backward compatibility with ctnetlink.
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Reported-by: Dominique Martinet <asmadeus@codewreck.org>
Tested-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/netfilter/nf_conntrack_tcp.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/netfilter/nf_conntrack_tcp.h b/include/uapi/linux/netfilter/nf_conntrack_tcp.h index 74b91151d494..bcba72def817 100644 --- a/include/uapi/linux/netfilter/nf_conntrack_tcp.h +++ b/include/uapi/linux/netfilter/nf_conntrack_tcp.h @@ -46,6 +46,9 @@ enum tcp_conntrack { /* Marks possibility for expected RFC5961 challenge ACK */ #define IP_CT_EXP_CHALLENGE_ACK 0x40 +/* Simultaneous open initialized */ +#define IP_CT_TCP_SIMULTANEOUS_OPEN 0x80 + struct nf_ct_tcp_flags { __u8 flags; __u8 mask; |