NetBSD/sys/netinet/tcp_fsm.h

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/* $NetBSD: tcp_fsm.h,v 1.14 2004/04/20 22:54:31 matt Exp $ */
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/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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
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* 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
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*/
#ifndef _NETINET_TCP_FSM_H_
#define _NETINET_TCP_FSM_H_
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/*
* 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 send 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 ACK */
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#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 */
#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))
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#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.
*/
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const u_char tcp_outflags[TCP_NSTATES] = {
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TH_RST|TH_ACK, /* CLOSED */
0, /* LISTEN */
TH_SYN, /* SYN_SENT */
TH_SYN|TH_ACK, /* SYN_RCVD */
TH_ACK, /* ESTABLISHED */
TH_ACK, /* CLOSE_WAIT */
TH_FIN|TH_ACK, /* FIN_WAIT_1 */
TH_FIN|TH_ACK, /* CLOSING */
TH_FIN|TH_ACK, /* LAST_ACK */
TH_ACK, /* FIN_WAIT_2 */
TH_ACK, /* TIME_WAIT */
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};
#endif
#ifdef KPROF
int tcp_acounts[TCP_NSTATES][PRU_NREQ];
#endif
#ifdef TCPSTATES
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const char * const tcpstates[] = {
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"CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
"ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
"LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
};
#elif defined(_KERNEL)
extern const char * const tcpstates[];
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#endif
#endif /* _NETINET_TCP_FSM_H_ */