package-update/network/iptables/rocknet_iptables.sh

# --- SDE-COPYRIGHT-NOTE-BEGIN ---
# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
#
# Filename: package/.../iptables/rocknet_iptables.sh
# Copyright (C) 2008 - 2010 The OpenSDE Project
# Copyright (C) 2004 - 2006 The T2 SDE Project
#
# More information can be found in the files COPYING and README.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License. A copy of the
# GNU General Public License can be found in the file COPYING.
# --- SDE-COPYRIGHT-NOTE-END ---

iptables_init_if() {
	if isfirst "iptables_$if"; then
		# prepare INPUT
		addcode up   1 1 "iptables -N firewall_$if"
		addcode up   1 2 "iptables -A INPUT -i $if `
			`-m state --state ESTABLISHED,RELATED -j ACCEPT"
		addcode up   1 3 "iptables -A INPUT -i $if -j firewall_$if"

		# prepare FORWARD
		addcode up   1 1 "iptables -N forward_$if"
		addcode up   1 2 "iptables -A FORWARD -i $if `
			`-m state --state ESTABLISHED,RELATED -j ACCEPT"
		addcode up   1 3 "iptables -A FORWARD -i $if -j forward_$if"

		# clean INPUT
		addcode down 1 3 "iptables -F firewall_$if"
		addcode down 1 2 "iptables -D INPUT -i $if -j firewall_$if"
		addcode down 1 2 "iptables -D INPUT -i $if `
			`-m state --state ESTABLISHED,RELATED -j ACCEPT"
		addcode down 1 1 "iptables -X firewall_$if"

		# clean FORWARD
		addcode down 1 3 "iptables -F forward_$if"
		addcode down 1 2 "iptables -D FORWARD -i $if -j forward_$if"
		addcode down 1 2 "iptables -D FORWARD -i $if `
			`-m state --state ESTABLISHED,RELATED -j ACCEPT"
		addcode down 1 1 "iptables -X forward_$if"
	fi
}

iptables_parse_conditions() {
	iptables_cond=
	while [ -n "$1" ]
	do
		case "$1" in
		    all)
			shift
			;;
		    tcp|udp)
			iptables_cond="$iptables_cond -p $1 --dport $2"
			shift; shift
			;;
		    icmp)
			iptables_cond="$iptables_cond -p icmp --icmp-type $2"
			shift; shift
			;;
		    ip)
			iptables_cond="$iptables_cond -s $2"
			shift; shift
			;;
		    *)
			error "Unkown accept/reject/drop condition: $1"
			shift
		esac
	done
}

public_accept() {
	iptables_parse_conditions "$@"
	local level=6; [ "$ip" ] && level=5
	addcode up 1 $level "iptables -A firewall_$if ${ip:+-d $ip} $iptables_cond -j ACCEPT"
	iptables_init_if
}

public_reject() {
	iptables_parse_conditions "$@"
	local level=6; [ "$ip" ] && level=5
	addcode up 1 $level "iptables -A firewall_$if ${ip:+-d $ip} $iptables_cond -j REJECT"
	iptables_init_if
}

public_drop() {
	iptables_parse_conditions "$@"
	local level=6; [ "$ip" ] && level=5
	addcode up 1 $level "iptables -A firewall_$if ${ip:+-d $ip} $iptables_cond -j DROP"
	iptables_init_if
}

public_restrict() {
	iptables_parse_conditions "$@"
	local level=6; [ "$ip" ] && level=5
	addcode up 1 $level "iptables -A forward_$if ${ip:+-d $ip} $iptables_cond -j DROP"
	iptables_init_if
}

public_conduit() {
	# conduit (tcp|udp) port targetip[:targetport]
	#
	local proto=$1 port=$2
	local targetip=$3 targetport=$2 target=
	local x=
	shift 3

	if [ "${targetip/:/}" != "$targetip" ]; then
		targetport=${targetip#*:}
		targetip=${targetip%:*}
	fi

	if [ "$targetport" = "$port" ]; then
		target="$targetip"
	else
		target="$targetip:$targetport"
	fi

	addcode up 1 4 "iptables -t nat -A PREROUTING -i $if ${ip:+-d $ip} -p $proto \
		 --dport $port -j DNAT --to $target"
	if [ $# -eq 0 ]; then
		addcode up 1 4 "iptables -A forward_$if -p $proto -d $targetip \
			 --dport $targetport -j ACCEPT"
	else
		for x; do
			addcode up 1 4 "iptables -A forward_$if -p $proto -s $x -d $targetip \
				 --dport $targetport -j ACCEPT"
		done
	fi

	iptables_init_if
}

public_clamp_mtu() {
	addcode up 1 1 "iptables -A FORWARD ${if:+-o $if} -p tcp --tcp-flags SYN,RST SYN \
	                -j TCPMSS --clamp-mss-to-pmtu"
	addcode down 9 1 "iptables -D FORWARD ${if:+-o $if} -p tcp --tcp-flags SYN,RST SYN \
	                  -j TCPMSS --clamp-mss-to-pmtu"
}

public_masquerade() {
	local src= action="-A"
	local tgt= jump=MASQUERADE

	[ -z "$1" ] || src="-s $1"
	if [ -n "$ip" ]; then
		tgt="--to $ip"
		jump="SNAT"
	fi

	case "$src" in
	*/32)	action=-I ;;
	esac

	addcode up   1 6 "iptables -t nat $action POSTROUTING $src -o $if -j $jump $tgt"
	addcode down 9 6 "iptables -t nat -D POSTROUTING $src -o $if -j $jump $tgt"
}