Home | History | Annotate | Line # | Download | only in netinet 
      1 /*	$NetBSD: tcp_fsm.h,v 1.16 2018/04/07 13:48:50 maxv Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)tcp_fsm.h	8.1 (Berkeley) 6/10/93
     32  */
     33 
     34 #ifndef _NETINET_TCP_FSM_H_
     35 #define _NETINET_TCP_FSM_H_
     36 
     37 /*
     38  * TCP FSM state definitions.
     39  * Per RFC793, September, 1981.
     40  */
     41 
     42 #define	TCP_NSTATES	11
     43 
     44 #define	TCPS_CLOSED		0	/* closed */
     45 #define	TCPS_LISTEN		1	/* listening for connection */
     46 #define	TCPS_SYN_SENT		2	/* active, have sent syn */
     47 #define	TCPS_SYN_RECEIVED	3	/* have send and received syn */
     48 /* states < TCPS_ESTABLISHED are those where connections not established */
     49 #define	TCPS_ESTABLISHED	4	/* established */
     50 #define	TCPS_CLOSE_WAIT		5	/* rcvd fin, waiting for close */
     51 /* states > TCPS_CLOSE_WAIT are those where user has closed */
     52 #define	TCPS_FIN_WAIT_1		6	/* have closed, sent fin */
     53 #define	TCPS_CLOSING		7	/* closed xchd FIN; await ACK */
     54 #define	TCPS_LAST_ACK		8	/* had fin and close; await FIN ACK */
     55 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
     56 #define	TCPS_FIN_WAIT_2		9	/* have closed, fin is acked */
     57 #define	TCPS_TIME_WAIT		10	/* in 2*msl quiet wait after close */
     58 
     59 #define	TCPS_HAVERCVDSYN(s)	((s) >= TCPS_SYN_RECEIVED)
     60 #define	TCPS_HAVEESTABLISHED(s)	((s) >= TCPS_ESTABLISHED)
     61 #define	TCPS_HAVERCVDFIN(s) \
     62     ((s) == TCPS_CLOSE_WAIT || ((s) >= TCPS_CLOSING && (s) != TCPS_FIN_WAIT_2))
     63 
     64 #ifdef	TCPOUTFLAGS
     65 /*
     66  * Flags used when sending segments in tcp_output.
     67  * Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
     68  * determined by state, with the proviso that TH_FIN is sent only
     69  * if all data queued for output is included in the segment.
     70  */
     71 const u_char	tcp_outflags[TCP_NSTATES] = {
     72 	TH_RST|TH_ACK,	/* CLOSED */
     73 	0,		/* LISTEN */
     74 	TH_SYN,		/* SYN_SENT */
     75 	TH_SYN|TH_ACK,	/* SYN_RCVD */
     76 	TH_ACK,		/* ESTABLISHED */
     77 	TH_ACK,		/* CLOSE_WAIT */
     78 	TH_FIN|TH_ACK,	/* FIN_WAIT_1 */
     79 	TH_FIN|TH_ACK,	/* CLOSING */
     80 	TH_FIN|TH_ACK,	/* LAST_ACK */
     81 	TH_ACK,		/* FIN_WAIT_2 */
     82 	TH_ACK,		/* TIME_WAIT */
     83 };
     84 #endif
     85 
     86 #ifdef	TCPSTATES
     87 const char * const tcpstates[] = {
     88 	"CLOSED",	"LISTEN",	"SYN_SENT",	"SYN_RCVD",
     89 	"ESTABLISHED",	"CLOSE_WAIT",	"FIN_WAIT_1",	"CLOSING",
     90 	"LAST_ACK",	"FIN_WAIT_2",	"TIME_WAIT",
     91 };
     92 #elif defined(_KERNEL)
     93 extern const char * const tcpstates[];
     94 #endif
     95 
     96 #endif /* !_NETINET_TCP_FSM_H_ */
     97