Remove linkEP from DeliverNetworkPacket

The specified LinkEndpoint is not being used in a significant way.
No behavior change, existing tests pass.

This change is a breaking change.

PiperOrigin-RevId: 313496602

4 files changed, 5 insertions, 5 deletions

diff --git a/pkg/tcpip/stack/forwarder_test.go b/pkg/tcpip/stack/forwarder_test.go
index 8084d50bc..344d60baa 100644
--- a/pkg/tcpip/stack/forwarder_test.go
+++ b/pkg/tcpip/stack/forwarder_test.go
@@ -209,7 +209,7 @@ func (e *fwdTestLinkEndpoint) InjectInbound(protocol tcpip.NetworkProtocolNumber
 
 // InjectLinkAddr injects an inbound packet with a remote link address.
 func (e *fwdTestLinkEndpoint) InjectLinkAddr(protocol tcpip.NetworkProtocolNumber, remote tcpip.LinkAddress, pkt PacketBuffer) {
-	e.dispatcher.DeliverNetworkPacket(e, remote, "" /* local */, protocol, pkt)
+	e.dispatcher.DeliverNetworkPacket(remote, "" /* local */, protocol, pkt)
 }
 
 // Attach saves the stack network-layer dispatcher for use later when packets
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index 54103fdb3..9213cbb9a 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -1167,7 +1167,7 @@ func handlePacket(protocol tcpip.NetworkProtocolNumber, dst, src tcpip.Address,
 // Note that the ownership of the slice backing vv is retained by the caller.
 // This rule applies only to the slice itself, not to the items of the slice;
 // the ownership of the items is not retained by the caller.
-func (n *NIC) DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt PacketBuffer) {
+func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt PacketBuffer) {
 	n.mu.RLock()
 	enabled := n.mu.enabled
 	// If the NIC is not yet enabled, don't receive any packets.
@@ -1240,7 +1240,7 @@ func (n *NIC) DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.Link
 	}
 
 	if ref := n.getRef(protocol, dst); ref != nil {
-		handlePacket(protocol, dst, src, linkEP.LinkAddress(), remote, ref, pkt)
+		handlePacket(protocol, dst, src, n.linkEP.LinkAddress(), remote, ref, pkt)
 		return
 	}
 
diff --git a/pkg/tcpip/stack/nic_test.go b/pkg/tcpip/stack/nic_test.go
index d672fc157..b01b3f476 100644
--- a/pkg/tcpip/stack/nic_test.go
+++ b/pkg/tcpip/stack/nic_test.go
@@ -44,7 +44,7 @@ func TestDisabledRxStatsWhenNICDisabled(t *testing.T) {
 		t.FailNow()
 	}
 
-	nic.DeliverNetworkPacket(nil, "", "", 0, PacketBuffer{Data: buffer.View([]byte{1, 2, 3, 4}).ToVectorisedView()})
+	nic.DeliverNetworkPacket("", "", 0, PacketBuffer{Data: buffer.View([]byte{1, 2, 3, 4}).ToVectorisedView()})
 
 	if got := nic.stats.DisabledRx.Packets.Value(); got != 1 {
 		t.Errorf("got DisabledRx.Packets = %d, want = 1", got)
diff --git a/pkg/tcpip/stack/registration.go b/pkg/tcpip/stack/registration.go
index b331427c6..a25657cd7 100644
--- a/pkg/tcpip/stack/registration.go
+++ b/pkg/tcpip/stack/registration.go
@@ -326,7 +326,7 @@ type NetworkDispatcher interface {
 	// packets sent via loopback), and won't have the field set.
 	//
 	// DeliverNetworkPacket takes ownership of pkt.
-	DeliverNetworkPacket(linkEP LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt PacketBuffer)
+	DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt PacketBuffer)
 }
 
 // LinkEndpointCapabilities is the type associated with the capabilities