116 lines
4.3 KiB
C
116 lines
4.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_fsm.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NETINET_TCP_FSM_H_
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#define _NETINET_TCP_FSM_H_
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/*
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* TCP FSM state definitions.
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*
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* Per RFC793, September, 1981.
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*/
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#define TCP_NSTATES 11
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#define TCPS_CLOSED 0 /* closed */
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#define TCPS_LISTEN 1 /* listening for connection */
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#define TCPS_SYN_SENT 2 /* active, have sent syn */
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#define TCPS_SYN_RECEIVED 3 /* have sent and received syn */
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/* states < TCPS_ESTABLISHED are those where connections not established */
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#define TCPS_ESTABLISHED 4 /* established */
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#define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
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/* states > TCPS_CLOSE_WAIT are those where user has closed */
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#define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
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#define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
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#define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
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/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
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#define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
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#define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
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/* for KAME src sync over BSD*'s */
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#define TCP6_NSTATES TCP_NSTATES
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#define TCP6S_CLOSED TCPS_CLOSED
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#define TCP6S_LISTEN TCPS_LISTEN
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#define TCP6S_SYN_SENT TCPS_SYN_SENT
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#define TCP6S_SYN_RECEIVED TCPS_SYN_RECEIVED
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#define TCP6S_ESTABLISHED TCPS_ESTABLISHED
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#define TCP6S_CLOSE_WAIT TCPS_CLOSE_WAIT
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#define TCP6S_FIN_WAIT_1 TCPS_FIN_WAIT_1
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#define TCP6S_CLOSING TCPS_CLOSING
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#define TCP6S_LAST_ACK TCPS_LAST_ACK
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#define TCP6S_FIN_WAIT_2 TCPS_FIN_WAIT_2
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#define TCP6S_TIME_WAIT TCPS_TIME_WAIT
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#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
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#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
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#define TCPS_HAVERCVDFIN(s) \
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((s) == TCPS_CLOSE_WAIT || ((s) >= TCPS_CLOSING && (s) != TCPS_FIN_WAIT_2))
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#ifdef TCPOUTFLAGS
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/*
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* Flags used when sending segments in tcp_output. Basic flags (TH_RST,
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* TH_ACK,TH_SYN,TH_FIN) are totally determined by state, with the proviso
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* that TH_FIN is sent only if all data queued for output is included in the
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* segment.
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*/
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static u_char tcp_outflags[TCP_NSTATES] = {
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TH_RST|TH_ACK, /* 0, CLOSED */
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0, /* 1, LISTEN */
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TH_SYN, /* 2, SYN_SENT */
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TH_SYN|TH_ACK, /* 3, SYN_RECEIVED */
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TH_ACK, /* 4, ESTABLISHED */
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TH_ACK, /* 5, CLOSE_WAIT */
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TH_FIN|TH_ACK, /* 6, FIN_WAIT_1 */
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TH_FIN|TH_ACK, /* 7, CLOSING */
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TH_FIN|TH_ACK, /* 8, LAST_ACK */
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TH_ACK, /* 9, FIN_WAIT_2 */
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TH_ACK, /* 10, TIME_WAIT */
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};
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#endif
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#ifdef KPROF
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int tcp_acounts[TCP_NSTATES][PRU_NREQ];
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#endif
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#ifdef TCPSTATES
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static char const * const tcpstates[] = {
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"CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD",
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"ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING",
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"LAST_ACK", "FIN_WAIT_2", "TIME_WAIT",
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};
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#endif
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#endif
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