--- /dev/null
+/*
+ */
+#ifndef _LINK_H_
+#define _LINK_H_
+
+#define ETHER_PROTO_IPV4 0x0800
+
+#include <stdint.h>
+#include <stdbool.h>
+
+extern void Link_Send(int IfNum, const void *Src, const void *Dst, uint16_t Proto, int BufCount, size_t BufLens[], const void *Bufs[]);
+
+extern bool Link_Pkt_Check(size_t len, const void *data, size_t *ofs, const void *Src, const void *Dst, uint16_t Proto);
+
+#endif
+