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| author | Eric Dumazet <edumazet@google.com> | 2013-06-20 05:52:22 -0700 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-06-20 20:28:49 +0200 |
| commit | 681f130f39e10087475383e6771b9366e26bab0c (patch) | |
| tree | 45f06119d209eb5031c0f80425664c7ad5e9c96e /include/uapi | |
| parent | 6547a221871f139cc56328a38105d47c14874cbe (diff) | |
| download | op-kernel-dev-681f130f39e10087475383e6771b9366e26bab0c.zip op-kernel-dev-681f130f39e10087475383e6771b9366e26bab0c.tar.gz | |
netfilter: xt_socket: add XT_SOCKET_NOWILDCARD flag
xt_socket module can be a nice replacement to conntrack module
in some cases (SYN filtering for example)
But it lacks the ability to match the 3rd packet of TCP
handshake (ACK coming from the client).
Add a XT_SOCKET_NOWILDCARD flag to disable the wildcard mechanism.
The wildcard is the legacy socket match behavior, that ignores
LISTEN sockets bound to INADDR_ANY (or ipv6 equivalent)
iptables -I INPUT -p tcp --syn -j SYN_CHAIN
iptables -I INPUT -m socket --nowildcard -j ACCEPT
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/netfilter/xt_socket.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/uapi/linux/netfilter/xt_socket.h b/include/uapi/linux/netfilter/xt_socket.h index 26d7217..6315e2a 100644 --- a/include/uapi/linux/netfilter/xt_socket.h +++ b/include/uapi/linux/netfilter/xt_socket.h @@ -5,10 +5,17 @@ enum { XT_SOCKET_TRANSPARENT = 1 << 0, + XT_SOCKET_NOWILDCARD = 1 << 1, }; struct xt_socket_mtinfo1 { __u8 flags; }; +#define XT_SOCKET_FLAGS_V1 XT_SOCKET_TRANSPARENT + +struct xt_socket_mtinfo2 { + __u8 flags; +}; +#define XT_SOCKET_FLAGS_V2 (XT_SOCKET_TRANSPARENT | XT_SOCKET_NOWILDCARD) #endif /* _XT_SOCKET_H */ |
