firewall: Initial alias interface support. This allows to define zones covering alias interfaces and associated entries like rules and forwardings.

SVN-Revision: 21653

package/firewall/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=firewall
 
 PKG_VERSION:=2
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 include $(INCLUDE_DIR)/package.mk
 

package/firewall/files/lib/core_interface.sh

@@ -4,10 +4,11 @@ fw_configure_interface() {
 	local iface=$1
 	local action=$2
 	local ifname=$3
+	local aliasnet=$4
 
 	[ "$action" == "add" ] && {
 		local status=$(uci_get_state network "$iface" up 0)
-		[ "$status" == 1 ] || return 0
+		[ "$status" == 1 ] || [ -n "$aliasnet" ] || return 0
 	}
 
 	[ -n "$ifname" ] || ifname=$(uci_get_state network "$iface" ifname "$iface")
@@ -20,59 +21,116 @@ fw_configure_interface() {
 		local zone=$2
 		local chain=zone_${zone}
 		local ifname=$3
+		local subnet=$4
 
+		local inet onet
 		local mode=$(fw_get_family_mode x $zone i)
 
-		fw $action $mode f ${chain}_ACCEPT ACCEPT ^ { -o "$ifname" }
+		case "$mode/$subnet" in
-		fw $action $mode f ${chain}_ACCEPT ACCEPT ^ { -i "$ifname" }
+			# Zone supports v6 only or dual, need v6
-		fw $action $mode f ${chain}_DROP   DROP   ^ { -o "$ifname" }
+			6/*:*|i/*:*)
-		fw $action $mode f ${chain}_DROP   DROP   ^ { -i "$ifname" }
+				inet="{ -s $subnet -d ::/0 }"
-		fw $action $mode f ${chain}_REJECT reject ^ { -o "$ifname" }
+				onet="{ -s ::/0 -d $subnet }"
-		fw $action $mode f ${chain}_REJECT reject ^ { -i "$ifname" }
+				mode=6
+			;;
 
-		fw $action $mode n ${chain}_nat MASQUERADE ^ { -o "$ifname" }
+			# Zone supports v4 only or dual, need v4
-		fw $action $mode f ${chain}_MSSFIX TCPMSS  ^ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu }
+			4/*.*.*.*|i/*.*.*.*)
+				inet="{ -s $subnet -d 0.0.0.0/0 }"
+				onet="{ -s 0.0.0.0/0 -d $subnet }"
+				mode=4
+			;;
 
-		fw $action $mode f input   ${chain}         $ { -i "$ifname" }
+			# Need v6 while zone is v4
-		fw $action $mode f forward ${chain}_forward $ { -i "$ifname" }
+			*/*:*) fw_log info "zone $zone does not support IPv6 address family, skipping"; return ;;
-		fw $action $mode n PREROUTING ${chain}_prerouting ^ { -i "$ifname" }
+
-		fw $action $mode r PREROUTING ${chain}_notrack    ^ { -i "$ifname" }
+			# Need v4 while zone is v6
+			*/*.*) fw_log info "zone $zone does not support IPv4 address family, skipping"; return ;;
+		esac
+
+		fw $action $mode f ${chain}_ACCEPT ACCEPT ^ $onet { -o "$ifname" }
+		fw $action $mode f ${chain}_ACCEPT ACCEPT ^ $inet { -i "$ifname" }
+		fw $action $mode f ${chain}_DROP   DROP   ^ $onet { -o "$ifname" }
+		fw $action $mode f ${chain}_DROP   DROP   ^ $inet { -i "$ifname" }
+		fw $action $mode f ${chain}_REJECT reject ^ $onet { -o "$ifname" }
+		fw $action $mode f ${chain}_REJECT reject ^ $inet { -i "$ifname" }
+
+		fw $action $mode n ${chain}_nat MASQUERADE ^ $onet { -o "$ifname" }
+		fw $action $mode f ${chain}_MSSFIX TCPMSS  ^ $onet { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu }
+
+		fw $action $mode f input   ${chain}         $ $inet { -i "$ifname" }
+		fw $action $mode f forward ${chain}_forward $ $inet { -i "$ifname" }
+		fw $action $mode n PREROUTING ${chain}_prerouting ^ $inet { -i "$ifname" }
+		fw $action $mode r PREROUTING ${chain}_notrack    ^ $inet { -i "$ifname" }
 	}
 
-	local old_zones old_ifname
+	local old_zones old_ifname old_subnet
 	config_get old_zones core "${iface}_zone"
 	[ -n "$old_zones" ] && {
 		config_get old_ifname core "${iface}_ifname"
-		for z in $old_zones; do
+		config_get old_subnet core "${iface}_subnet"
-			fw_log info "removing $iface ($old_ifname) from zone $z"
-			fw__do_rules del $z $old_ifname
 
-			ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
+		local z
+		for z in $old_zones; do
+			fw_log info "removing $iface ($old_ifname${old_subnet:+ alias $old_subnet}) from zone $z"
+			fw__do_rules del $z $old_ifname $old_subnet
+
+			[ -n "$old_subnet" ] || ACTION=remove ZONE="$z" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 		done
+
+		local old_aliases
+		config_get old_aliases core "${iface}_aliases"
+
+		local a
+		for a in $old_aliases; do
+			fw_configure_interface "$a" del "$old_ifname"
+		done
+
 		uci_revert_state firewall core "${iface}_zone"
 		uci_revert_state firewall core "${iface}_ifname"
+		uci_revert_state firewall core "${iface}_subnet"
+		uci_revert_state firewall core "${iface}_aliases"
 	}
+
 	[ "$action" == del ] && return
 
-	local new_zones
+	local new_zones=
 	load_zone() {
 		fw_config_get_zone "$1"
 		list_contains zone_network "$iface" || return
 
-		fw_log info "adding $iface ($ifname) to zone $zone_name"
+		fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
-		fw__do_rules add ${zone_name} "$ifname"
+		fw__do_rules add ${zone_name} "$ifname" $aliasnet
 		append new_zones $zone_name
 
-		ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
+		[ -n "$aliasnet" ] || ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
 	}
 	config_foreach load_zone zone
 
-	uci_set_state firewall core "${iface}_zone" "$new_zones"
+	[ -z "$aliasnet" ] && {
-	uci_set_state firewall core "${iface}_ifname" "$ifname"
+		local aliases
+		config_get aliases "$iface" aliases
+
+		local a
+		for a in $aliases; do
+			local ipaddr netmask ip6addr
+			config_get ipaddr "$a" ipaddr
+			config_get netmask "$a" netmask
+			config_get ip6addr "$a" ip6addr
+
+			[ -n "$ipaddr" ] && fw_configure_interface "$a" add "$ifname" "$ipaddr${netmask:+/$netmask}"
+			[ -n "$ip6addr" ] && fw_configure_interface "$a" add "$ifname" "$ip6addr"
+		done
 
 		fw_sysctl_interface $ifname
-
 		fw_callback post interface
+
+		uci_set_state firewall core "${iface}_aliases" "$aliases"
+	}
+
+	uci_set_state firewall core "${iface}_zone" "$new_zones"
+	uci_set_state firewall core "${iface}_ifname" "$ifname"
+	uci_set_state firewall core "${iface}_subnet" "$aliasnet"
 }
 
 fw_sysctl_interface() {

package/firewall/files/lib/core_rule.sh

@@ -11,7 +11,6 @@ fw_config_get_rule() {
 		string src_port "" \
 		string dest "" \
 		ipaddr dest_ip "" \
-		string dest_mac "" \
 		string dest_port "" \
 		string icmp_type "" \
 		string proto "tcpudp" \