update

cmd/wg-quick/main.go

@@ -3,10 +3,11 @@ package main
 import (
 	"flag"
 	"fmt"
-	"github.com/nmiculinic/wg-quick-go"
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"os"
+
+	"github.com/nmiculinic/wg-quick-go"
+	"github.com/sirupsen/logrus"
 )
 
 func printHelp() {
@@ -19,6 +20,7 @@ func main() {
 	flag.String("iface", "", "interface")
 	verbose := flag.Bool("v", false, "verbose")
 	protocol := flag.Int("route-protocol", 0, "route protocol to use for our routes")
+	metric := flag.Int("route-metric", 0, "route metric to use for our routes")
 	flag.Parse()
 	args := flag.Args()
 	if len(args) != 2 {
@@ -63,6 +65,7 @@ func main() {
 	}
 
 	c.RouteProtocol = *protocol
+	c.RouteMetric = *metric
 
 	switch args[0] {
 	case "up":

config.go

@@ -5,12 +5,13 @@ import (
 	"encoding"
 	"encoding/base64"
 	"fmt"
-	"github.com/mdlayher/wireguardctrl/wgtypes"
 	"net"
 	"strconv"
 	"strings"
 	"text/template"
 	"time"
+
+	"github.com/mdlayher/wireguardctrl/wgtypes"
 )
 
 // Config represents full wg-quick like config structure
@@ -38,6 +39,9 @@ type Config struct {
 	// RouteProtocol to set on the route. See linux/rtnetlink.h  Use value > 4 or default 0
 	RouteProtocol int
 
+	// RouteMetric sets this metric on all managed routes. Lower number means pick this one
+	RouteMetric int
+
 	// Address label to set on the link
 	AddressLabel string
 

wg.go

@@ -286,77 +286,99 @@ func SyncAddress(cfg *Config, link netlink.Link, log logrus.FieldLogger) error {
 	return nil
 }
 
+func fillRouteDefaults(rt *netlink.Route) {
+	// fill defaults
+	if rt.Table == 0 {
+		rt.Table = defaultRoutingTable
+	}
+
+	if rt.Protocol == 0 {
+		rt.Protocol = RTPROT_BOOT
+	}
+
+	if rt.Type == 0 {
+		rt.Type = 1 // RTN_UNICAST
+	}
+}
+
 // SyncRoutes adds/deletes all route assigned IPV4 addressed as specified in the config
 func SyncRoutes(cfg *Config, link netlink.Link, managedRoutes []net.IPNet, log logrus.FieldLogger) error {
-	routes, err := netlink.RouteList(link, syscall.AF_INET)
+	var wantedRoutes = make(map[string][]netlink.Route, len(managedRoutes))
+	presentRoutes, err := netlink.RouteList(link, syscall.AF_INET)
 	if err != nil {
 		log.Error(err, "cannot read existing routes")
 		return err
 	}
-
-	presentRoutes := make(map[string]netlink.Route, 0)
-	for _, r := range routes {
-		log := log.WithFields(map[string]interface{}{
-			"route":    r.Dst.String(),
-			"protocol": r.Protocol,
-			"table":    r.Table,
-			"type":     r.Type,
-		})
-		log.Debugf("detected existing route: %v", r)
-		if !(r.Table == cfg.Table || (cfg.Table == 0 && r.Table == defaultRoutingTable)) {
-			log.Debug("wrong table for route, skipping")
-			continue
-		}
-		presentRoutes[r.Dst.String()] = r
-		log.Debug("added route to consideration")
-	}
-
 	for _, rt := range managedRoutes {
-		log := log.WithField("route", rt.String())
-		route, present := presentRoutes[rt.String()]
-		presentRoutes[rt.String()] = netlink.Route{} // mark as visited
-		if present {
-			if route.Dst != nil && route.Protocol != cfg.RouteProtocol {
-				log.Warnf("route present; proto=%d != defined root proto=%d", route.Protocol, cfg.RouteProtocol)
-			} else {
-				log.Info("route present")
-			}
-			continue
-		}
-		if err := netlink.RouteAdd(&netlink.Route{
+		rt := rt // make copy
+		log.WithField("dst", rt.String()).Debug("managing route")
+
+		nrt := netlink.Route{
 			LinkIndex: link.Attrs().Index,
 			Dst:       &rt,
 			Table:     cfg.Table,
 			Protocol:  cfg.RouteProtocol,
-		}); err != nil {
-			log.WithError(err).Error("cannot setup route")
-			return err
-		}
-		log.Info("route added")
+			Priority:  cfg.RouteMetric}
+		fillRouteDefaults(&nrt)
+		wantedRoutes[rt.String()] = append(wantedRoutes[rt.String()], nrt)
 	}
 
-	// Clean extra routes
-	for _, rt := range presentRoutes {
-		if rt.Dst == nil { // skip visited routes
-			continue
-		}
+	for _, rtLst := range wantedRoutes {
+		for _, rt := range rtLst {
+			rt := rt // make copy
 			log := log.WithFields(map[string]interface{}{
 				"route":    rt.Dst.String(),
 				"protocol": rt.Protocol,
 				"table":    rt.Table,
 				"type":     rt.Type,
+				"metric":   rt.Priority,
 			})
-		log.Info("extra manual route found")
-		// RTPROT_BOOT is default one when other proto isn't defined
-		if !(rt.Protocol == cfg.RouteProtocol || rt.Protocol == RTPROT_BOOT && cfg.RouteProtocol == 0) {
+			if err := netlink.RouteReplace(&rt); err != nil {
+				log.WithError(err).Errorln("cannot add/replace route")
+				return err
+			}
+			log.Infoln("route added/replaced")
+		}
+	}
+
+	checkWanted := func(rt netlink.Route) bool {
+		for _, candidateRt := range wantedRoutes[rt.Dst.String()] {
+			if rt.Equal(candidateRt) {
+				return true
+			}
+		}
+		return false
+	}
+
+	for _, rt := range presentRoutes {
+		log := log.WithFields(map[string]interface{}{
+			"route":    rt.Dst.String(),
+			"protocol": rt.Protocol,
+			"table":    rt.Table,
+			"type":     rt.Type,
+			"metric":   rt.Priority,
+		})
+		if !(rt.Table == cfg.Table || (cfg.Table == 0 && rt.Table == defaultRoutingTable)) {
+			log.Debug("wrong table for route, skipping")
+			continue
+		}
+
+		if !(rt.Protocol == cfg.RouteProtocol) {
 			log.Infof("skipping route deletion, not owned by this daemon")
 			continue
 		}
+
+		if checkWanted(rt) {
+			log.Debug("route wanted, skipping deleting")
+			continue
+		}
+
 		if err := netlink.RouteDel(&rt); err != nil {
 			log.WithError(err).Error("cannot delete route")
 			return err
 		}
 		log.Info("route deleted")
 	}
+
 	return nil
 }