Chore: move stack & device to core

core/stack/icmp.go

@@ -0,0 +1,24 @@
+package stack
+
+import (
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+)
+
+func withICMPHandler() Option {
+	return func(s *Stack) error {
+		// Add default route table for IPv4 and IPv6.
+		// This will handle all incoming ICMP packets.
+		s.SetRouteTable([]tcpip.Route{
+			{
+				Destination: header.IPv4EmptySubnet,
+				NIC:         s.nicID,
+			},
+			{
+				Destination: header.IPv6EmptySubnet,
+				NIC:         s.nicID,
+			},
+		})
+		return nil
+	}
+}