diff --git a/sys/netinet/tcp_fsm.h b/sys/netinet/tcp_fsm.h
index 8bd129f613cf..ecef72fef26e 100644
--- a/sys/netinet/tcp_fsm.h
+++ b/sys/netinet/tcp_fsm.h
@@ -1,115 +1,101 @@
 /*-
  * SPDX-License-Identifier: BSD-3-Clause
  *
  * Copyright (c) 1982, 1986, 1993
  *	The Regents of the University of California.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  *	@(#)tcp_fsm.h	8.1 (Berkeley) 6/10/93
  * $FreeBSD$
  */
 
 #ifndef _NETINET_TCP_FSM_H_
 #define	_NETINET_TCP_FSM_H_
 
 /*
  * TCP FSM state definitions.
  *
  * Per RFC793, September, 1981.
  */
 
 #define	TCP_NSTATES	11
 
 #define	TCPS_CLOSED		0	/* closed */
 #define	TCPS_LISTEN		1	/* listening for connection */
 #define	TCPS_SYN_SENT		2	/* active, have sent syn */
 #define	TCPS_SYN_RECEIVED	3	/* have sent and received syn */
 /* states < TCPS_ESTABLISHED are those where connections not established */
 #define	TCPS_ESTABLISHED	4	/* established */
 #define	TCPS_CLOSE_WAIT		5	/* rcvd fin, waiting for close */
 /* states > TCPS_CLOSE_WAIT are those where user has closed */
 #define	TCPS_FIN_WAIT_1		6	/* have closed, sent fin */
 #define	TCPS_CLOSING		7	/* closed xchd FIN; await FIN ACK */
 #define	TCPS_LAST_ACK		8	/* had fin and close; await FIN ACK */
 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
 #define	TCPS_FIN_WAIT_2		9	/* have closed, fin is acked */
 #define	TCPS_TIME_WAIT		10	/* in 2*msl quiet wait after close */
 
-/* for KAME src sync over BSD*'s */
-#define	TCP6_NSTATES		TCP_NSTATES
-#define	TCP6S_CLOSED		TCPS_CLOSED
-#define	TCP6S_LISTEN		TCPS_LISTEN
-#define	TCP6S_SYN_SENT		TCPS_SYN_SENT
-#define	TCP6S_SYN_RECEIVED	TCPS_SYN_RECEIVED
-#define	TCP6S_ESTABLISHED	TCPS_ESTABLISHED
-#define	TCP6S_CLOSE_WAIT	TCPS_CLOSE_WAIT
-#define	TCP6S_FIN_WAIT_1	TCPS_FIN_WAIT_1
-#define	TCP6S_CLOSING		TCPS_CLOSING
-#define	TCP6S_LAST_ACK		TCPS_LAST_ACK
-#define	TCP6S_FIN_WAIT_2	TCPS_FIN_WAIT_2
-#define	TCP6S_TIME_WAIT		TCPS_TIME_WAIT
-
 #define	TCPS_HAVERCVDSYN(s)	((s) >= TCPS_SYN_RECEIVED)
 #define	TCPS_HAVEESTABLISHED(s)	((s) >= TCPS_ESTABLISHED)
 #define	TCPS_HAVERCVDFIN(s)	\
     ((s) == TCPS_CLOSE_WAIT || ((s) >= TCPS_CLOSING && (s) != TCPS_FIN_WAIT_2))
 
 #ifdef	TCPOUTFLAGS
 /*
  * Flags used when sending segments in tcp_output.  Basic flags (TH_RST,
  * TH_ACK,TH_SYN,TH_FIN) are totally determined by state, with the proviso
  * that TH_FIN is sent only if all data queued for output is included in the
  * segment.
  */
 static u_char	tcp_outflags[TCP_NSTATES] = {
 	TH_RST|TH_ACK,		/* 0, CLOSED */
 	0,			/* 1, LISTEN */
 	TH_SYN,			/* 2, SYN_SENT */
 	TH_SYN|TH_ACK,		/* 3, SYN_RECEIVED */
 	TH_ACK,			/* 4, ESTABLISHED */
 	TH_ACK,			/* 5, CLOSE_WAIT */
 	TH_FIN|TH_ACK,		/* 6, FIN_WAIT_1 */
 	TH_FIN|TH_ACK,		/* 7, CLOSING */
 	TH_FIN|TH_ACK,		/* 8, LAST_ACK */
 	TH_ACK,			/* 9, FIN_WAIT_2 */
 	TH_ACK,			/* 10, TIME_WAIT */
 };
 #endif
 
 #ifdef KPROF
 int	tcp_acounts[TCP_NSTATES][PRU_NREQ];
 #endif
 
 #ifdef	TCPSTATES
 static char const * const tcpstates[] = {
 	"CLOSED",	"LISTEN",	"SYN_SENT",	"SYN_RCVD",
 	"ESTABLISHED",	"CLOSE_WAIT",	"FIN_WAIT_1",	"CLOSING",
 	"LAST_ACK",	"FIN_WAIT_2",	"TIME_WAIT",
 };
 #endif
 
 #endif