diff --git a/include/linux/tcp_diag.h b/include/linux/tcp_diag.h
new file mode 100644
index 0000000..ceee962
--- /dev/null
+++ b/include/linux/tcp_diag.h
@@ -0,0 +1,127 @@
+#ifndef _TCP_DIAG_H_
+#define _TCP_DIAG_H_ 1
+
+/* Just some random number */
+#define TCPDIAG_GETSOCK 18
+
+/* Socket identity */
+struct tcpdiag_sockid
+{
+	__u16	tcpdiag_sport;
+	__u16	tcpdiag_dport;
+	__u32	tcpdiag_src[4];
+	__u32	tcpdiag_dst[4];
+	__u32	tcpdiag_if;
+	__u32	tcpdiag_cookie[2];
+#define TCPDIAG_NOCOOKIE (~0U)
+};
+
+/* Request structure */
+
+struct tcpdiagreq
+{
+	__u8	tcpdiag_family;		/* Family of addresses. */
+	__u8	tcpdiag_src_len;
+	__u8	tcpdiag_dst_len;
+	__u8	tcpdiag_ext;		/* Query extended information */
+
+	struct tcpdiag_sockid id;
+
+	__u32	tcpdiag_states;		/* States to dump */
+	__u32	tcpdiag_dbs;		/* Tables to dump (NI) */
+};
+
+enum
+{
+	TCPDIAG_REQ_NONE,
+	TCPDIAG_REQ_BYTECODE,
+};
+
+#define TCPDIAG_REQ_MAX TCPDIAG_REQ_BYTECODE
+
+/* Bytecode is sequence of 4 byte commands followed by variable arguments.
+ * All the commands identified by "code" are conditional jumps forward:
+ * to offset cc+"yes" or to offset cc+"no". "yes" is supposed to be
+ * length of the command and its arguments.
+ */
+ 
+struct tcpdiag_bc_op
+{
+	unsigned char	code;
+	unsigned char	yes;
+	unsigned short	no;
+};
+
+enum
+{
+	TCPDIAG_BC_NOP,
+	TCPDIAG_BC_JMP,
+	TCPDIAG_BC_S_GE,
+	TCPDIAG_BC_S_LE,
+	TCPDIAG_BC_D_GE,
+	TCPDIAG_BC_D_LE,
+	TCPDIAG_BC_AUTO,
+	TCPDIAG_BC_S_COND,
+	TCPDIAG_BC_D_COND,
+};
+
+struct tcpdiag_hostcond
+{
+	__u8	family;
+	__u8	prefix_len;
+	int	port;
+	__u32	addr[0];
+};
+
+/* Base info structure. It contains socket identity (addrs/ports/cookie)
+ * and, alas, the information shown by netstat. */
+struct tcpdiagmsg
+{
+	__u8	tcpdiag_family;
+	__u8	tcpdiag_state;
+	__u8	tcpdiag_timer;
+	__u8	tcpdiag_retrans;
+
+	struct tcpdiag_sockid id;
+
+	__u32	tcpdiag_expires;
+	__u32	tcpdiag_rqueue;
+	__u32	tcpdiag_wqueue;
+	__u32	tcpdiag_uid;
+	__u32	tcpdiag_inode;
+};
+
+/* Extensions */
+
+enum
+{
+	TCPDIAG_NONE,
+	TCPDIAG_MEMINFO,
+	TCPDIAG_INFO,
+	TCPDIAG_VEGASINFO,
+};
+
+#define TCPDIAG_MAX TCPDIAG_VEGASINFO
+
+
+/* TCPDIAG_MEM */
+
+struct tcpdiag_meminfo
+{
+	__u32	tcpdiag_rmem;
+	__u32	tcpdiag_wmem;
+	__u32	tcpdiag_fmem;
+	__u32	tcpdiag_tmem;
+};
+
+/* TCPDIAG_VEGASINFO */
+
+struct tcpvegas_info {
+	__u32	tcpv_enabled;
+	__u32	tcpv_rttcnt;
+	__u32	tcpv_rtt;
+	__u32	tcpv_minrtt;
+};
+
+
+#endif /* _TCP_DIAG_H_ */