tayga: allow more flexible routing

In some scenarios (e.g. 464xlat) it is desirable to not route the mapped
prefix to tayga's interface. This adds an option 'noroutes' which, when
set to 1, will prevent such routes from being added.

Signed-off-by: Nils Schneider <nils@nilsschneider.net>

ipv6/tayga/files/tayga-proto.sh

@@ -14,8 +14,8 @@ proto_tayga_setup() {
 	local iface="$2"
 	local link="tayga-$cfg"
 
-	local ipv4_addr ipv6_addr prefix dynamic_pool ipaddr ip6addr
-	json_get_vars ipv4_addr ipv6_addr prefix dynamic_pool ipaddr ip6addr
+	local ipv4_addr ipv6_addr prefix dynamic_pool ipaddr ip6addr noroutes
+	json_get_vars ipv4_addr ipv6_addr prefix dynamic_pool ipaddr ip6addr noroutes
 	[ -z "$ipv4_addr" -o -z "$prefix" ] && {
 		proto_notify_error "$cfg" "REQUIRED_PARAMETERS_MISSING"
 		proto_block_restart "$cfg"
@@ -49,16 +49,19 @@ proto_tayga_setup() {
 
 	[ -n "$ipaddr" ]  && proto_add_ipv4_address "$ipaddr" "255.255.255.255"
 	[ -n "$ip6addr" ] && proto_add_ipv6_address "$ip6addr" "128"
-	[ -n "$ipv6_addr" ] && proto_add_ipv6_route "$ipv6_addr" "128"
-	[ -n "$dynamic_pool" ] && {
-		local pool="${dynamic_pool%%/*}"
-		local mask="${dynamic_pool##*/}"
-		proto_add_ipv4_route "$pool" "$mask"
-	}
-	[ -n "$prefix" ] && {
-		local prefix6="${prefix%%/*}"
-		local mask6="${prefix##*/}"
-		proto_add_ipv6_route "$prefix6" "$mask6"
+
+	[ "$noroutes" != 1 ] && {
+		[ -n "$ipv6_addr" ] && proto_add_ipv6_route "$ipv6_addr" "128"
+		[ -n "$dynamic_pool" ] && {
+			local pool="${dynamic_pool%%/*}"
+			local mask="${dynamic_pool##*/}"
+			proto_add_ipv4_route "$pool" "$mask"
+		}
+		[ -n "$prefix" ] && {
+			local prefix6="${prefix%%/*}"
+			local mask6="${prefix##*/}"
+			proto_add_ipv6_route "$prefix6" "$mask6"
+		}
 	}
 
 	proto_send_update "$cfg"
@@ -85,6 +88,7 @@ proto_tayga_init_config() {
 	proto_config_add_string "dynamic_pool"
 	proto_config_add_string "ipaddr"
 	proto_config_add_string "ip6addr:ip6addr"
+	proto_config_add_boolean "noroutes"
 }
 
 [ -n "$INCLUDE_ONLY" ] || {