Resolve known link address on route creation

If a Route is being created through a link that requires link address
resolution and a remote address that has a known mapping to a link
address, populate the link address when the route is created.

This removes the need for neighbor/link address caches to perform this
check.

Fixes #5149

PiperOrigin-RevId: 352122401

1 files changed, 0 insertions, 17 deletions

diff --git a/pkg/tcpip/stack/linkaddrcache_test.go b/pkg/tcpip/stack/linkaddrcache_test.go
index 03b2f2d6f..d7ac6cf5f 100644
--- a/pkg/tcpip/stack/linkaddrcache_test.go
+++ b/pkg/tcpip/stack/linkaddrcache_test.go
@@ -273,20 +273,3 @@ func TestCacheResolutionTimeout(t *testing.T) {
 		t.Errorf("got getBlocking(_, %#v, _) = (%s, %s), want = (_, %s)", e.addr, a, err, tcpip.ErrTimeout)
 	}
 }
-
-// TestStaticResolution checks that static link addresses are resolved immediately and don't
-// send resolution requests.
-func TestStaticResolution(t *testing.T) {
-	c := newLinkAddrCache(1<<63-1, time.Millisecond, 1)
-	linkRes := &testLinkAddressResolver{cache: c, delay: time.Minute}
-
-	addr := tcpip.Address("broadcast")
-	want := tcpip.LinkAddress("mac_broadcast")
-	got, _, err := c.get(tcpip.FullAddress{Addr: addr}, linkRes, "", nil, nil)
-	if err != nil {
-		t.Errorf("c.get(%q)=%q, got error: %v", string(addr), string(got), err)
-	}
-	if got != want {
-		t.Errorf("c.get(%q)=%q, want %q", string(addr), string(got), string(want))
-	}
-}