1 /* $OpenBSD: tcp_fsm.h,v 1.9 2018/02/05 14:53:26 bluhm Exp $ */ 2 /* $NetBSD: tcp_fsm.h,v 1.6 1994/10/14 16:01:48 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. 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 * Per RFC793, September, 1981. 41 */ 42 43 #define TCP_NSTATES 11 44 45 #define TCPS_CLOSED 0 /* closed */ 46 #define TCPS_LISTEN 1 /* listening for connection */ 47 #define TCPS_SYN_SENT 2 /* active, have sent syn */ 48 #define TCPS_SYN_RECEIVED 3 /* have sent and received syn */ 49 /* states < TCPS_ESTABLISHED are those where connections not established */ 50 #define TCPS_ESTABLISHED 4 /* established */ 51 #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ 52 /* states > TCPS_CLOSE_WAIT are those where user has closed */ 53 #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ 54 #define TCPS_CLOSING 7 /* closed xchd FIN; await ACK */ 55 #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ 56 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ 57 #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ 58 #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ 59 60 #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) 61 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) 62 #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT) 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 u_char tcp_outflags[TCP_NSTATES] = { 72 TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK, 73 TH_ACK, TH_ACK, 74 TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK, 75 }; 76 #endif /* TCPOUTFLAGS */ 77 78 #ifdef TCPSTATES 79 const char *tcpstates[] = { 80 "CLOSED", "LISTEN", "SYN_SENT", "SYN_RCVD", 81 "ESTABLISHED", "CLOSE_WAIT", "FIN_WAIT_1", "CLOSING", 82 "LAST_ACK", "FIN_WAIT_2", "TIME_WAIT", 83 }; 84 #endif /* TCPSTATES */ 85 #endif /* _NETINET_TCP_FSM_H_ */ 86