Include off-link route's preference in update events

RFC 4191 supports the notion of a preference value for default routers
and more-specific routes, so update the OffLinkRouteUpdate event to
include this preference value so integrators may prioritize routes
based on a route's advertised preference value.

Note, more-specific route discovery is not supported yet, but will be in
a later change.

Updates #6172.

Test: ndp_test.TestRouterDiscovery
PiperOrigin-RevId: 380243716

1 files changed, 1 insertions, 1 deletions

diff --git a/pkg/tcpip/tests/integration/loopback_test.go b/pkg/tcpip/tests/integration/loopback_test.go
index b4b2ec723..b2008f0b2 100644
--- a/pkg/tcpip/tests/integration/loopback_test.go
+++ b/pkg/tcpip/tests/integration/loopback_test.go
@@ -44,7 +44,7 @@ type ndpDispatcher struct{}
 func (*ndpDispatcher) OnDuplicateAddressDetectionResult(tcpip.NICID, tcpip.Address, stack.DADResult) {
 }
 
-func (*ndpDispatcher) OnOffLinkRouteUpdated(tcpip.NICID, tcpip.Subnet, tcpip.Address) {
+func (*ndpDispatcher) OnOffLinkRouteUpdated(tcpip.NICID, tcpip.Subnet, tcpip.Address, header.NDPRoutePreference) {
 }
 
 func (*ndpDispatcher) OnOffLinkRouteInvalidated(tcpip.NICID, tcpip.Subnet, tcpip.Address) {}