From b65a70131d0d38844be12235270eebaa9d2f5a4d Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 12 Jul 2016 22:04:17 +0200
Subject: src: add xt compat support

At compilation time, you have to pass this option.

  # ./configure --with-xtables

And libxtables needs to be installed in your system.

This patch allows to list a ruleset containing xt extensions loaded
through iptables-compat-restore tool.

Example:

$ iptables-save > ruleset

$ cat ruleset
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -p tcp -m multiport --dports 80,81 -j REJECT
COMMIT

$ sudo iptables-compat-restore ruleset

$ sudo nft list rulseset
table ip filter {
    chain INPUT {
        type filter hook input priority 0; policy accept;
        ip protocol tcp tcp dport { 80,81} counter packets 0 bytes 0 reject
    }

    chain FORWARD {
        type filter hook forward priority 0; policy drop;
    }

    chain OUTPUT {
        type filter hook output priority 0; policy accept;
    }
}

A translation of the extension is shown if this is available. In other
case, match or target definition is preceded by a hash. For example,
classify target has not translation:

$ sudo nft list chain mangle POSTROUTING
table ip mangle {
    chain POSTROUTING {
        type filter hook postrouting priority -150; policy accept;
        ip protocol tcp tcp dport 80 counter packets 0 bytes 0 # CLASSIFY set 20:10
                                                              ^^^
    }
}

If the whole ruleset is translatable, the users can (re)load it using
"nft -f" and get nft native support for all their rules.

This patch is joint work by the authors listed below.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo M. Bermudo Garay <pablombg@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/Makefile.am | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/Makefile.am')

diff --git a/src/Makefile.am b/src/Makefile.am
index fd632193..8c59449c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -8,6 +8,9 @@ AM_CPPFLAGS += -DDEFAULT_INCLUDE_PATH="\"${sysconfdir}\"" \
 if BUILD_DEBUG
 AM_CPPFLAGS += -g -DDEBUG
 endif
+if BUILD_XTABLES
+AM_CPPFLAGS += ${XTABLES_CFLAGS}
+endif
 
 AM_CFLAGS = -Wall								\
 	    -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations	\
@@ -59,3 +62,8 @@ nft_SOURCES +=	mini-gmp.c
 endif
 
 nft_LDADD	= ${LIBMNL_LIBS} ${LIBNFTNL_LIBS}
+
+if BUILD_XTABLES
+nft_SOURCES +=	xt.c
+nft_LDADD   +=  ${XTABLES_LIBS}
+endif
-- 
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