[backfire] merge dual stack firewall

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@25353 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/firewall/files/lib/core_rule.sh

@@ -0,0 +1,71 @@
+# Copyright (C) 2009-2010 OpenWrt.org
+
+fw_config_get_rule() {
+	[ "${rule_NAME}" != "$1" ] || return
+	fw_config_get_section "$1" rule { \
+		string _name "$1" \
+		string name "" \
+		string src "" \
+		ipaddr src_ip "" \
+		string src_mac "" \
+		string src_port "" \
+		string dest "" \
+		ipaddr dest_ip "" \
+		string dest_port "" \
+		string icmp_type "" \
+		string proto "tcpudp" \
+		string target "" \
+		string family "" \
+	} || return
+	[ -n "$rule_name" ] || rule_name=$rule__name
+	[ "$rule_proto" == "icmp" ] || rule_icmp_type=
+}
+
+fw_load_rule() {
+	fw_config_get_rule "$1"
+
+	[ "$rule_target" != "NOTRACK" ] || [ -n "$rule_src" ] || {
+		fw_log error "NOTRACK rule ${rule_name}: needs src, skipping"
+		return 0
+	}
+
+	fw_callback pre rule
+
+	fw_get_port_range rule_src_port $rule_src_port
+	fw_get_port_range rule_dest_port $rule_dest_port
+
+	local table=f
+	local chain=input
+	local target="${rule_target:-REJECT}"
+	if [ "$target" == "NOTRACK" ]; then
+		table=r
+		chain="zone_${rule_src}_notrack"
+	else
+		[ -n "$rule_src" ] && chain="zone_${rule_src}${rule_dest:+_forward}"
+		[ -n "$rule_dest" ] && target="zone_${rule_dest}_${target}"
+	fi
+
+	local mode
+	fw_get_family_mode mode ${rule_family:-x} $rule_src I
+
+	local src_spec dest_spec
+	fw_get_negation src_spec '-s' "${rule_src_ip:+$rule_src_ip/$rule_src_ip_prefixlen}"
+	fw_get_negation dest_spec '-d' "${rule_dest_ip:+$rule_dest_ip/$rule_dest_ip_prefixlen}"
+
+	[ "$rule_proto" == "tcpudp" ] && rule_proto="tcp udp"
+	for rule_proto in $rule_proto; do
+		local rule_pos
+		eval 'rule_pos=$((++FW__RULE_COUNT_'${mode#G}'_'$chain'))'
+
+		fw add $mode $table $chain $target $rule_pos { $rule_src_ip $rule_dest_ip } { \
+			$src_spec $dest_spec \
+			${rule_proto:+-p $rule_proto} \
+			${rule_src_port:+--sport $rule_src_port} \
+			${rule_src_mac:+-m mac --mac-source $rule_src_mac} \
+			${rule_dest_port:+--dport $rule_dest_port} \
+			${rule_icmp_type:+--icmp-type $rule_icmp_type} \
+		}
+	done
+
+	fw_callback post rule
+}