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

SVN-Revision: 23141

package/firewall/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=firewall
 
 PKG_VERSION:=2
-PKG_RELEASE:=17
+PKG_RELEASE:=18
 
 include $(INCLUDE_DIR)/package.mk
 

package/firewall/files/lib/core_init.sh

@@ -245,9 +245,9 @@ fw_load_zone() {
 	if [ "$zone_masq" == 1 ]; then
 		local msrc mdst
 		for msrc in ${zone_masq_src:-0.0.0.0/0}; do
-			[ "${msrc#!}" != "$msrc" ] && msrc="! -s ${msrc#!}" || msrc="-s $msrc"
+			fw_get_negation msrc '-s' "$msrc"
 			for mdst in ${zone_masq_dest:-0.0.0.0/0}; do
-				[ "${mdst#!}" != "$mdst" ] && mdst="! -d ${mdst#!}" || mdst="-d $mdst"
+				fw_get_negation mdst '-d' "$mdst"
 				fw add $mode n ${chain}_nat MASQUERADE $ { $msrc $mdst }
 			done
 		done

package/firewall/files/lib/core_redirect.sh

@@ -41,7 +41,7 @@ fw_load_redirect() {
 		nataddr="$redirect_dest_ip"
 		fw_get_port_range natports "$redirect_dest_port" "-"
 
-		srcdaddr="${redirect_src_dip:+$redirect_src_dip/$redirect_src_dip_prefixlen}"
+		fw_get_negation srcdaddr '-d' "${redirect_src_dip:+$redirect_src_dip/$redirect_src_dip_prefixlen}"
 		fw_get_port_range srcdports "$redirect_src_dport" ":"
 
 		list_contains FW_CONNTRACK_ZONES $redirect_src || \
@@ -60,7 +60,7 @@ fw_load_redirect() {
 		nataddr="$redirect_src_dip"
 		fw_get_port_range natports "$redirect_src_dport" "-"
 
-		srcdaddr="${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
+		fw_get_negation srcdaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
 		fw_get_port_range srcdports "$redirect_dest_port" ":"
 
 		list_contains FW_CONNTRACK_ZONES $redirect_dest || \
@@ -74,21 +74,24 @@ fw_load_redirect() {
 	local mode
 	fw_get_family_mode mode ${redirect_family:-x} ${redirect_src:-$redirect_dest} I
 
-	local srcaddr="${redirect_src_ip:+$redirect_src_ip/$redirect_src_ip_prefixlen}"
+	local srcaddr
+	fw_get_negation srcaddr '-s' "${redirect_src_ip:+$redirect_src_ip/$redirect_src_ip_prefixlen}"
+
 	local srcports
 	fw_get_port_range srcports "$redirect_src_port" ":"
 
-	local destaddr="${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
+	local destaddr
+	fw_get_negation destaddr '-d' "${redirect_dest_ip:+$redirect_dest_ip/$redirect_dest_ip_prefixlen}"
+
 	local destports
 	fw_get_port_range destports "${redirect_dest_port:-$redirect_src_dport}" ":"
 
 	[ "$redirect_proto" == "tcpudp" ] && redirect_proto="tcp udp"
 	for redirect_proto in $redirect_proto; do
 		fw add $mode n $natchain $redirect_target ^ { $redirect_src_ip $redirect_dest_ip } { \
+			$srcaddr $srcdaddr \
 			${redirect_proto:+-p $redirect_proto} \
-			${srcaddr:+-s $srcaddr} \
 			${srcports:+--sport $srcports} \
-			${srcdaddr:+-d $srcdaddr} \
 			${srcdports:+--dport $srcdports} \
 			${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
 			$natopt $nataddr${natports:+:$natports} \
@@ -96,10 +99,9 @@ fw_load_redirect() {
 
 		[ -n "$destaddr" ] && \
 		fw add $mode f ${fwdchain:-forward} ACCEPT ^ { $redirect_src_ip $redirect_dest_ip } { \
+			$srcaddr $destaddr \
 			${redirect_proto:+-p $redirect_proto} \
-			${srcaddr:+-s $srcaddr} \
 			${srcports:+--sport $srcports} \
-			${destaddr:+-d $destaddr} \
 			${destports:+--dport $destports} \
 			${redirect_src_mac:+-m mac --mac-source $redirect_src_mac} \
 		}

package/firewall/files/lib/core_rule.sh

@@ -24,42 +24,45 @@ fw_config_get_rule() {
 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
-	[ -n "$rule_src" ] && {
-		[ -z "$rule_dest" ] && {
-			chain=zone_${rule_src}
-		} || {
-			chain=zone_${rule_src}_forward
-		}
-	}
+	if [ "$rule_target" == "NOTRACK" ]; then
+		table=r
+		chain="zone_${rule_src}_notrack"
+	elif [ -n "$rule_src" ]; then
+		chain="zone_${rule_src}${rule_dest:+_forward}"
+	fi
 
-	local target=$rule_target
-	[ -z "$target" ] && {
-		target=REJECT
-	}
-	[ -n "$dest" ] && {
-		target=zone_${rule_dest}_${target}
-	}
+	local target="${rule_target:-REJECT}"
+	[ -n "$dest" ] && target="zone_${rule_dest}_${target}"
 
 	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}"
+
 	local rule_pos
 	eval 'rule_pos=$((++FW__RULE_COUNT_'$mode'_'$chain'))'
 
 	[ "$rule_proto" == "tcpudp" ] && rule_proto="tcp udp"
 	for rule_proto in $rule_proto; do
-		fw add $mode f $chain $target $rule_pos { $rule_src_ip $rule_dest_ip } { \
+		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_ip:+-s $rule_src_ip/$rule_src_ip_prefixlen} \
 			${rule_src_port:+--sport $rule_src_port} \
 			${rule_src_mac:+-m mac --mac-source $rule_src_mac} \
-			${rule_dest_ip:+-d $rule_dest_ip/$rule_dest_ip_prefixlen} \
 			${rule_dest_port:+--dport $rule_dest_port} \
 			${rule_icmp_type:+--icmp-type $rule_icmp_type} \
 		}

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}"
+}