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 */ 34 35 #ifndef _NETINET_TCP_FSM_H_ 36 #define _NETINET_TCP_FSM_H_ 37 38 /* 39 * TCP FSM state definitions. 40 * 41 * Per RFC793, September, 1981. 42 */ 43 44 #define TCP_NSTATES 11 45 46 #define TCPS_CLOSED 0 /* closed */ 47 #define TCPS_LISTEN 1 /* listening for connection */ 48 #define TCPS_SYN_SENT 2 /* active, have sent syn */ 49 #define TCPS_SYN_RECEIVED 3 /* have sent and received syn */ 50 /* states < TCPS_ESTABLISHED are those where connections not established */ 51 #define TCPS_ESTABLISHED 4 /* established */ 52 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ 53 /* states > TCPS_CLOSE_WAIT are those where user has closed */ 54 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ 55 #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ 56 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ 57 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ 58 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ 59 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ 60 61 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) 62 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) 63 #define TCPS_HAVERCVDFIN(s) \ 64 ((s) == TCPS_CLOSE_WAIT || ((s) >= TCPS_CLOSING && (s) != TCPS_FIN_WAIT_2)) 65 66 #ifdef TCPOUTFLAGS 67 /* 68 * Flags used when sending segments in tcp_output. Basic flags (TH_RST, 69 * TH_ACK,TH_SYN,TH_FIN) are totally determined by state, with the proviso 70 * that TH_FIN is sent only if all data queued for output is included in the 71 * segment. 72 */ 73 static u_char tcp_outflags[TCP_NSTATES] = { 74 TH_RST|TH_ACK, /* 0, CLOSED */ 75 0, /* 1, LISTEN */ 76 TH_SYN, /* 2, SYN_SENT */ 77 TH_SYN|TH_ACK, /* 3, SYN_RECEIVED */ 78 TH_ACK, /* 4, ESTABLISHED */ 79 TH_ACK, /* 5, CLOSE_WAIT */ 80 TH_FIN|TH_ACK, /* 6, FIN_WAIT_1 */ 81 TH_FIN|TH_ACK, /* 7, CLOSING */ 82 TH_FIN|TH_ACK, /* 8, LAST_ACK */ 83 TH_ACK, /* 9, FIN_WAIT_2 */ 84 TH_ACK, /* 10, TIME_WAIT */ 85 }; 86 #endif 87 88 #ifdef TCPSTATES 89 static char const * const tcpstates[] = { 90 "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD", 91 "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING", 92 "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT", 93 }; 94 #endif 95 96 #endif 97