Pass local link address to DeliverNetworkPacket

This allows a NetworkDispatcher to implement transparent bridging,
assuming all implementations of LinkEndpoint.WritePacket call eth.Encode
with header.EthernetFields.SrcAddr set to the passed
Route.LocalLinkAddress, if it is provided.

PiperOrigin-RevId: 213686651
Change-Id: I446a4ac070970202f0724ef796ff1056ae4dd72a

2 files changed, 6 insertions, 6 deletions

diff --git a/pkg/tcpip/link/waitable/waitable.go b/pkg/tcpip/link/waitable/waitable.go
index 9b69f844e..ef8c88561 100644
--- a/pkg/tcpip/link/waitable/waitable.go
+++ b/pkg/tcpip/link/waitable/waitable.go
@@ -51,12 +51,12 @@ func New(lower tcpip.LinkEndpointID) (tcpip.LinkEndpointID, *Endpoint) {
 // It is called by the link-layer endpoint being wrapped when a packet arrives,
 // and only forwards to the actual dispatcher if Wait or WaitDispatch haven't
 // been called.
-func (e *Endpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remoteLinkAddr tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView) {
+func (e *Endpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remoteLinkAddr, localLinkAddress tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView) {
 	if !e.dispatchGate.Enter() {
 		return
 	}
 
-	e.dispatcher.DeliverNetworkPacket(e, remoteLinkAddr, protocol, vv)
+	e.dispatcher.DeliverNetworkPacket(e, remoteLinkAddr, localLinkAddress, protocol, vv)
 	e.dispatchGate.Leave()
 }
 
diff --git a/pkg/tcpip/link/waitable/waitable_test.go b/pkg/tcpip/link/waitable/waitable_test.go
index 1301cd4b2..0a15c40de 100644
--- a/pkg/tcpip/link/waitable/waitable_test.go
+++ b/pkg/tcpip/link/waitable/waitable_test.go
@@ -35,7 +35,7 @@ type countedEndpoint struct {
 	dispatcher stack.NetworkDispatcher
 }
 
-func (e *countedEndpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remoteLinkAddr tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView) {
+func (e *countedEndpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remoteLinkAddr, localLinkAddr tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, vv buffer.VectorisedView) {
 	e.dispatchCount++
 }
 
@@ -106,21 +106,21 @@ func TestWaitDispatch(t *testing.T) {
 	}
 
 	// Dispatch and check that it goes through.
-	ep.dispatcher.DeliverNetworkPacket(ep, "", 0, buffer.VectorisedView{})
+	ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, buffer.VectorisedView{})
 	if want := 1; ep.dispatchCount != want {
 		t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want)
 	}
 
 	// Wait on writes, then try to dispatch. It must go through.
 	wep.WaitWrite()
-	ep.dispatcher.DeliverNetworkPacket(ep, "", 0, buffer.VectorisedView{})
+	ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, buffer.VectorisedView{})
 	if want := 2; ep.dispatchCount != want {
 		t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want)
 	}
 
 	// Wait on dispatches, then try to dispatch. It must not go through.
 	wep.WaitDispatch()
-	ep.dispatcher.DeliverNetworkPacket(ep, "", 0, buffer.VectorisedView{})
+	ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, buffer.VectorisedView{})
 	if want := 2; ep.dispatchCount != want {
 		t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want)
 	}