firewall: - fix processing of rules with an ip family option - append interface rules at the end of internal zone chains, simplifies injecting user or addon rules - support simple file logging (option log + option log_limit per zone)

SVN-Revision: 22847

package/firewall/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=firewall
 
 PKG_VERSION:=2
-PKG_RELEASE:=9
+PKG_RELEASE:=10
 
 include $(INCLUDE_DIR)/package.mk
 

package/firewall/files/lib/core_init.sh

@@ -84,13 +84,16 @@ fw_load_defaults() {
 	[ $defaults_syn_flood == 1 ] && \
 		defaults_synflood_protect=1
 
+	[ "${defaults_synflood_rate%/*}" == "$defaults_synflood_rate" ] && \
+		defaults_synflood_rate="$defaults_synflood_rate/second"
+
 	[ $defaults_synflood_protect == 1 ] && {
 		echo "Loading synflood protection"
 		fw_callback pre synflood
 		fw add i f syn_flood
 		fw add i f syn_flood RETURN { \
 			-p tcp --syn \
-			-m limit --limit "${defaults_synflood_rate}/second" --limit-burst "${defaults_synflood_burst}" \
+			-m limit --limit "${defaults_synflood_rate}" --limit-burst "${defaults_synflood_burst}" \
 		}
 		fw add i f syn_flood DROP
 		fw add i f INPUT syn_flood { -p tcp --syn }
@@ -142,6 +145,8 @@ fw_config_get_zone() {
 		boolean conntrack 0 \
 		boolean mtu_fix 0 \
 		boolean custom_chains "$FW_ADD_CUSTOM_CHAINS" \
+		boolean log 0 \
+		string log_limit 10 \
 		string family "" \
 	} || return
 	[ -n "$zone_name" ] || zone_name=$zone_NAME
@@ -204,6 +209,7 @@ fw_load_zone() {
 	fw add $mode n ${chain}_prerouting
 
 	fw add $mode r ${chain}_notrack
+
 	[ $zone_masq == 1 ] && \
 		fw add $mode n POSTROUTING ${chain}_nat $
 
@@ -224,6 +230,17 @@ fw_load_zone() {
 		fw add $mode n ${chain}_prerouting prerouting_${zone_name} ^
 	}
 
+	[ "$zone_log" == 1 ] && {
+		[ "${zone_log_limit%/*}" == "$zone_log_limit" ] && \
+			zone_log_limit="$zone_log_limit/minute"
+
+		local t
+		for t in REJECT DROP MSSFIX; do
+			fw add $mode f ${chain}_${t} LOG ^ \
+				{ -m limit --limit $zone_log_limit --log-prefix "$t($zone_name): "  }
+		done
+	}
+
 	fw_callback post zone
 }
 

package/firewall/files/lib/core_interface.sh

@@ -32,16 +32,16 @@ fw_configure_interface() {
 
 		case "$mode/$subnet" in
 			# Zone supports v6 only or dual, need v6
-			6/*:*|i/*:*)
-				inet="{ -s $subnet -d ::/0 }"
-				onet="{ -s ::/0 -d $subnet }"
+			G6/*:*|i/*:*)
+				inet="-s $subnet -d ::/0"
+				onet="-s ::/0 -d $subnet"
 				mode=6
 			;;
 
 			# Zone supports v4 only or dual, need v4
-			4/*.*.*.*|i/*.*.*.*)
-				inet="{ -s $subnet -d 0.0.0.0/0 }"
-				onet="{ -s 0.0.0.0/0 -d $subnet }"
+			G4/*.*.*.*|i/*.*.*.*)
+				inet="-s $subnet -d 0.0.0.0/0"
+				onet="-s 0.0.0.0/0 -d $subnet"
 				mode=4
 			;;
 
@@ -52,20 +52,20 @@ fw_configure_interface() {
 			*/*.*) 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 f ${chain}_ACCEPT ACCEPT $ { -o "$ifname" $onet }
+		fw $action $mode f ${chain}_ACCEPT ACCEPT $ { -i "$ifname" $inet }
+		fw $action $mode f ${chain}_DROP   DROP   $ { -o "$ifname" $onet }
+		fw $action $mode f ${chain}_DROP   DROP   $ { -i "$ifname" $inet }
+		fw $action $mode f ${chain}_REJECT reject $ { -o "$ifname" $onet }
+		fw $action $mode f ${chain}_REJECT reject $ { -i "$ifname" $inet }
 
-		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 n ${chain}_nat MASQUERADE $ { -o "$ifname" $onet }
+		fw $action $mode f ${chain}_MSSFIX TCPMSS  $ { -o "$ifname" -p tcp --tcp-flags SYN,RST SYN --clamp-mss-to-pmtu $onet }
 
-		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" }
+		fw $action $mode f input   ${chain}         $ { -i "$ifname" $inet }
+		fw $action $mode f forward ${chain}_forward $ { -i "$ifname" $inet }
+		fw $action $mode n PREROUTING ${chain}_prerouting $ { -i "$ifname" $inet }
+		fw $action $mode r PREROUTING ${chain}_notrack    $ { -i "$ifname" $inet }
 	}
 
 	local old_zones old_ifname old_subnets
@@ -101,19 +101,6 @@ fw_configure_interface() {
 
 	[ "$action" == del ] && return
 
-	local new_zones=
-	load_zone() {
-		fw_config_get_zone "$1"
-		list_contains zone_network "$iface" || return
-
-		fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
-		fw__do_rules add ${zone_name} "$ifname" $aliasnet
-		append new_zones $zone_name
-
-		[ -n "$aliasnet" ] || ACTION=add ZONE="$zone_name" INTERFACE="$iface" DEVICE="$ifname" /sbin/hotplug-call firewall
-	}
-	config_foreach load_zone zone
-
 	[ -z "$aliasnet" ] && {
 		local aliases
 		config_get aliases "$iface" aliases
@@ -142,6 +129,19 @@ fw_configure_interface() {
 		uci_set_state firewall core "${iface}_subnets" "$subnets"
 	}
 
+	local new_zones=
+	load_zone() {
+		fw_config_get_zone "$1"
+		list_contains zone_network "$iface" || return
+
+		fw_log info "adding $iface ($ifname${aliasnet:+ alias $aliasnet}) to zone $zone_name"
+		fw__do_rules add ${zone_name} "$ifname" $aliasnet
+		append new_zones $zone_name
+
+		[ -n "$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" "$new_zones"
 	uci_set_state firewall core "${iface}_ifname" "$ifname"
 }

package/firewall/files/lib/fw.sh

@@ -36,7 +36,7 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
 	done
 
 	fw__rc() {
-		export FW_${fam}_ERROR=$1
+		export FW_${fam#G}_ERROR=$1
 		return $1
 	}
 
@@ -75,14 +75,14 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
 			return
 		fi
 		local mod
-		eval "mod=\$FW_${fam}_${tab}"
+		eval "mod=\$FW_${fam#G}_${tab}"
 		if [ "$mod" ]; then
 			fw__rc $mod
 			return
 		fi
 		case "$fam" in
-			4) mod=iptable_${tab} ;;
-			6) mod=ip6table_${tab} ;;
+			*4) mod=iptable_${tab} ;;
+			*6) mod=ip6table_${tab} ;;
 			*) mod=. ;;
 		esac
 		grep -q "^${mod} " /proc/modules
@@ -100,8 +100,8 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
 	local app=
 	local pol=
 	case "$fam" in
-		4) [ $FW_DISABLE_IPV4 == 0 ] && app=iptables  || return ;;
-		6) [ $FW_DISABLE_IPV6 == 0 ] && app=ip6tables || return ;;
+		*4) [ $FW_DISABLE_IPV4 == 0 ] && app=iptables  || return ;;
+		*6) [ $FW_DISABLE_IPV6 == 0 ] && app=ip6tables || return ;;
 		i) fw__dualip "$@"; return ;;
 		I) fw__autoip "$@"; return ;;
 		e) app=ebtables ;;
@@ -148,19 +148,23 @@ fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
 		return 0
 	fi
 
+	case "$fam" in
+		G*) shift; while [ "$1" != "{" ]; do shift; done ;;
+	esac
+
 	if [ $# -gt 0 ]; then
 		shift
 		if [ $cmd == delete ]; then
 			pos=
 		fi
 	fi
+
 	while [ $# -gt 1 ]; do
 		case "$app:$1" in
 			ip6tables:--icmp-type) echo -n "--icmpv6-type" ;;
 			ip6tables:icmp|ip6tables:ICMP) echo -n "icmpv6" ;;
 			iptables:--icmpv6-type) echo -n "--icmp-type" ;;
 			iptables:icmpv6) echo -n "icmp" ;;
-			*:}|*:{) shift; continue ;;
 			*) echo -n "$1" ;;
 		esac
 		echo -ne "\0"
@@ -202,8 +206,8 @@ fw_get_family_mode() {
 	}
 
 	case "$hint:$ipv4:$ipv6" in
-		*4:1:*|*:1:0) echo 4 ;;
-		*6:*:1|*:0:1) echo 6 ;;
+		*4:1:*|*:1:0) echo G4 ;;
+		*6:*:1|*:0:1) echo G6 ;;
 		*) echo $mode ;;
 	esac
 }