From 2be1d52644cf77bb2634fb504a265da480c5e901 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?M=C3=A1t=C3=A9=20Eckl?= Date: Fri, 20 Jul 2018 09:40:09 +0200 Subject: src: Add tproxy support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds support for transparent proxy functionality which is supported in ip, ip6 and inet tables. The syntax is the following: tproxy [{|ip|ip6}] to {|:|:} It looks for a socket listening on the specified address or port and assigns it to the matching packet. In an inet table, a packet matches for both families until address is specified. Network protocol family has to be specified **only** in inet tables if address is specified. As transparent proxy support is implemented for sockets with layer 4 information, a transport protocol header criterion has to be set in the same rule. eg. 'meta l4proto tcp' or 'udp dport 4444' Example ruleset: table ip x { chain y { type filter hook prerouting priority -150; policy accept; tcp dport ntp tproxy to 1.1.1.1 udp dport ssh tproxy to :2222 } } table ip6 x { chain y { type filter hook prerouting priority -150; policy accept; tcp dport ntp tproxy to [dead::beef] udp dport ssh tproxy to :2222 } } table inet x { chain y { type filter hook prerouting priority -150; policy accept; tcp dport 321 tproxy to :ssh tcp dport 99 tproxy ip to 1.1.1.1:999 udp dport 155 tproxy ip6 to [dead::beef]:smux } } Signed-off-by: Máté Eckl Signed-off-by: Pablo Neira Ayuso --- src/scanner.l | 2 ++ 1 file changed, 2 insertions(+) (limited to 'src/scanner.l') diff --git a/src/scanner.l b/src/scanner.l index ed01b5e7..703700fe 100644 --- a/src/scanner.l +++ b/src/scanner.l @@ -261,6 +261,8 @@ addrstring ({macaddr}|{ip4addr}|{ip6addr}) "socket" { return SOCKET; } "transparent" { return TRANSPARENT;} +"tproxy" { return TPROXY; } + "accept" { return ACCEPT; } "drop" { return DROP; } "continue" { return CONTINUE; } -- cgit v1.2.3