1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)tcp_fsm.h 8.1 (Berkeley) 6/10/93 33 * $FreeBSD$ 34 */ 35 36 #ifndef _NETINET_TCP_FSM_H_ 37 #define _NETINET_TCP_FSM_H_ 38 39 /* 40 * TCP FSM state definitions. 41 * 42 * Per RFC793, September, 1981. 43 */ 44 45 #define TCP_NSTATES 11 46 47 #define TCPS_CLOSED 0 /* closed */ 48 #define TCPS_LISTEN 1 /* listening for connection */ 49 #define TCPS_SYN_SENT 2 /* active, have sent syn */ 50 #define TCPS_SYN_RECEIVED 3 /* have sent and received syn */ 51 /* states < TCPS_ESTABLISHED are those where connections not established */ 52 #define TCPS_ESTABLISHED 4 /* established */ 53 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ 54 /* states > TCPS_CLOSE_WAIT are those where user has closed */ 55 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ 56 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ 57 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ 58 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ 59 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ 60 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ 61 62 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) 63 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) 64 #define TCPS_HAVERCVDFIN(s) \ 65 ((s) == TCPS_CLOSE_WAIT || ((s) >= TCPS_CLOSING && (s) != TCPS_FIN_WAIT_2)) 66 67 #ifdef TCPOUTFLAGS 68 /* 69 * Flags used when sending segments in tcp_output. Basic flags (TH_RST, 70 * TH_ACK,TH_SYN,TH_FIN) are totally determined by state, with the proviso 71 * that TH_FIN is sent only if all data queued for output is included in the 72 * segment. 73 */ 74 static u_char tcp_outflags[TCP_NSTATES] = { 75 TH_RST|TH_ACK, /* 0, CLOSED */ 76 0, /* 1, LISTEN */ 77 TH_SYN, /* 2, SYN_SENT */ 78 TH_SYN|TH_ACK, /* 3, SYN_RECEIVED */ 79 TH_ACK, /* 4, ESTABLISHED */ 80 TH_ACK, /* 5, CLOSE_WAIT */ 81 TH_FIN|TH_ACK, /* 6, FIN_WAIT_1 */ 82 TH_FIN|TH_ACK, /* 7, CLOSING */ 83 TH_FIN|TH_ACK, /* 8, LAST_ACK */ 84 TH_ACK, /* 9, FIN_WAIT_2 */ 85 TH_ACK, /* 10, TIME_WAIT */ 86 }; 87 #endif 88 89 #ifdef TCPSTATES 90 static char const * const tcpstates[] = { 91 "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD", 92 "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING", 93 "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT", 94 }; 95 #endif 96 97 #endif 98