Merge release-20210628.0-15-g07ffecef8 (automated)

1 files changed, 19 insertions, 0 deletions

diff --git a/pkg/tcpip/header/ndp_router_advert.go b/pkg/tcpip/header/ndp_router_advert.go
index 7e2f0c797..7d6efa083 100644
--- a/pkg/tcpip/header/ndp_router_advert.go
+++ b/pkg/tcpip/header/ndp_router_advert.go
@@ -16,9 +16,12 @@ package header
 
 import (
 	"encoding/binary"
+	"fmt"
 	"time"
 )
 
+var _ fmt.Stringer = NDPRoutePreference(0)
+
 // NDPRoutePreference is the preference values for default routers or
 // more-specific routes.
 //
@@ -64,6 +67,22 @@ const (
 	ReservedRoutePreference = 0b10
 )
 
+// String implements fmt.Stringer.
+func (p NDPRoutePreference) String() string {
+	switch p {
+	case HighRoutePreference:
+		return "HighRoutePreference"
+	case MediumRoutePreference:
+		return "MediumRoutePreference"
+	case LowRoutePreference:
+		return "LowRoutePreference"
+	case ReservedRoutePreference:
+		return "ReservedRoutePreference"
+	default:
+		return fmt.Sprintf("NDPRoutePreference(%d)", p)
+	}
+}
+
 // NDPRouterAdvert is an NDP Router Advertisement message. It will only contain
 // the body of an ICMPv6 packet.
 //