ip6tables review

Init-script and config based on the IPv4-ones, but all NAT-related stuff
dropped.

package/iptables/Makefile

@@ -14,6 +14,8 @@ PKG_DEPENDS+=		kmod-nf-conntrack-ipv4 kmod-nf-nat
 PKG_DEPENDS+=		kmod-ip-nf-target-masquerade kmod-ip-nf-target-reject
 PKG_DEPENDS+=		kmod-ip-nf-filter kmod-ip-nf-match-state 
 PKG_DEPENDS+=		kmod-netfilter-xt-target-tcpmss
+PKG_DEPENDS6:=		kmod-ip6-nf-iptables kmod-nf-conntrack-ipv6
+PKG_DEPENDS6+=		kmod-ip6-nf-filter kmod-ip6-nf-target-reject
 PKG_URL:=		http://www.netfilter.org
 PKG_SITES:=		http://www.netfilter.org/projects/iptables/files/ \
 			ftp://ftp.be.netfilter.org/pub/netfilter/iptables/ \
@@ -29,7 +31,7 @@ include ${TOPDIR}/mk/package.mk
 #include ${LINUX_DIR}/.config
 
 $(eval $(call PKG_template,IPTABLES,iptables,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
-$(eval $(call PKG_template,IP6TABLES,ip6tables,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
+$(eval $(call PKG_template,IP6TABLES,ip6tables,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS6},${PKG_DESCR},${PKG_SECTION}))
 
 CONFIGURE_ARGS+=	--enable-devel
 
@@ -44,8 +46,8 @@ post-install: ${SUB_INSTALL-m} ${SUB_INSTALL-y}
 	${CP} ${WRKINST}/usr/lib/libxtables.so* ${IDIR_IPTABLES}/usr/lib
 
 ip6tables-install:
-	${INSTALL_DIR} ${IDIR_IP6TABLES}/usr/lib
-	${INSTALL_DIR} ${IDIR_IP6TABLES}/usr/sbin
+	${INSTALL_DIR} ${IDIR_IP6TABLES}/{usr/lib,etc,usr/sbin}
+	${INSTALL_DATA} ./files/firewall6.conf ${IDIR_IP6TABLES}/etc
 	${INSTALL_BIN} ${WRKINST}/usr/sbin/ip6tables ${IDIR_IP6TABLES}/usr/sbin/
 	${CP} ${WRKINST}/usr/lib/libip6tc.so* ${IDIR_IP6TABLES}/usr/lib
 

package/iptables/files/firewall6.conf

@@ -0,0 +1,98 @@
+#!/bin/sh
+echo "configure /etc/firewall6.conf first."
+exit 1
+
+### Interfaces
+WAN=sixxs
+LAN=br0
+WLAN=wlan0
+
+######################################################################
+### Default ruleset
+######################################################################
+
+### Create chains
+ip6tables -N input_rule
+ip6tables -N forwarding_rule
+
+### Default policy
+ip6tables -P INPUT DROP
+ip6tables -P FORWARD DROP
+ip6tables -P OUTPUT DROP
+
+### INPUT
+###  (connections with the router as destination)
+
+# base case
+ip6tables -A INPUT -m state --state INVALID -j DROP
+ip6tables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+ip6tables -A INPUT -p tcp --tcp-flags SYN SYN \! --tcp-option 2 -j DROP
+
+# custom rules
+ip6tables -A INPUT -j input_rule
+
+# allow access from anything but WAN
+ip6tables -A INPUT ${WAN:+\! -i $WAN} -j ACCEPT
+# allow icmp messages
+ip6tables -A INPUT -p icmp6 -j ACCEPT
+
+# reject
+ip6tables -A INPUT -p tcp -j REJECT --reject-with tcp-reset
+ip6tables -A INPUT -j REJECT --reject-with icmp6-port-unreachable
+
+### OUTPUT
+###  (connections with the router as source)
+
+# base case
+ip6tables -A OUTPUT -m state --state RELATED,ESTABLISHED,NEW -j ACCEPT
+ip6tables -A OUTPUT -p icmp6 -j ACCEPT
+
+### FORWARD
+###  (connections routed through the router)
+
+# base case
+ip6tables -A FORWARD -m state --state INVALID -j DROP
+ip6tables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+# fix for broken ISPs blocking ICMPv6 "packet too big" packets
+#ip6tables -t mangle -A FORWARD -p tcp -o $WAN --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
+
+# custom rules
+ip6tables -A FORWARD -j forwarding_rule
+
+# allow LAN
+ip6tables -A FORWARD -i $LAN -o $WAN -j ACCEPT
+
+######################################################################
+### Default ruleset end
+######################################################################
+
+###
+### Connections to the router
+###
+
+# ssh
+#ip6tables -A input_rule -i $WAN -p tcp -s <a.b.c.d> --dport 22 -j ACCEPT
+
+# IPSec
+#ip6tables -A input_rule -i $WAN -p esp -s <a.b.c.d> -j ACCEPT
+#ip6tables -A input_rule -i $WAN -p udp -s <a.b.c.d> --dport 500 -j ACCEPT
+
+# OpenVPN
+#ip6tables -A input_rule -i $WAN -p udp -s <a.b.c.d> --dport 1194 -j ACCEPT
+
+# PPTP
+#ip6tables -A input_rule -i $WAN -p gre -j ACCEPT
+#ip6tables -A input_rule -i $WAN -p tcp --dport 1723 -j ACCEPT
+
+###
+###  VPN traffic
+###
+
+# IPSec
+#ip6tables -A forwarding_rule -o ipsec+ -j ACCEPT
+#ip6tables -A forwarding_rule -i ipsec+ -j ACCEPT
+
+# OpenVPN
+#ip6tables -A forwarding_rule -o tun+ -j ACCEPT
+#ip6tables -A forwarding_rule -i tun+ -j ACCEPT

package/iptables/files/firewall6.init

@@ -0,0 +1,31 @@
+#!/bin/sh
+#PKG iptables
+#INIT 45
+. /etc/rc.conf
+
+case $1 in
+autostop) ;;
+autostart)
+	test x"${firewall6:-NO}" = x"NO" && exit 0
+	exec sh $0 start
+	;;
+start)
+	. /etc/firewall6.conf
+	;;
+stop)
+	### Clear tables
+	ip6tables -F
+	ip6tables -X
+	ip6tables -P INPUT ACCEPT
+	ip6tables -P FORWARD ACCEPT
+	ip6tables -P OUTPUT ACCEPT
+	;;
+restart)
+	sh $0 stop
+	sh $0 start
+	;;
+*)
+	echo "Usage: $0 {start | stop | restart}"
+	;;
+esac
+exit $?

package/iptables/files/iptables.postinst

@@ -2,3 +2,4 @@
 . $IPKG_INSTROOT/etc/functions.sh
 
 add_rcconf iptables firewall NO
+add_rcconf iptables firewall6 NO