[package] fireall:

- support negations for src_ip, dest_ip, src_dip options in rules and redirects
	- add NOTRACK target to rule sections, allows to define fine grained notrack rules


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23141 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/firewall/files/lib/fw.sh

@@ -218,3 +218,12 @@ fw_get_family_mode() {
 	esac
 }
 
+fw_get_negation() {
+	local _var="$1"
+	local _flag="$2"
+	local _ipaddr="$3"
+
+	[ "${_ipaddr#!}" != "$_ipaddr" ] && \
+		export -n -- "$_var=! $_flag ${_ipaddr#!}" || \
+		export -n -- "$_var=${_ipaddr:+$_flag $_ipaddr}"
+}