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Annotation of XNU/bsd/netinet/tcp_fsm.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1982, 1986, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)tcp_fsm.h   8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #ifndef _NETINET_TCP_FSM_H_
        !            58: #define _NETINET_TCP_FSM_H_
        !            59: 
        !            60: /*
        !            61:  * TCP FSM state definitions.
        !            62:  * Per RFC793, September, 1981.
        !            63:  */
        !            64: 
        !            65: #define        TCP_NSTATES     11
        !            66: 
        !            67: #define        TCPS_CLOSED             0       /* closed */
        !            68: #define        TCPS_LISTEN             1       /* listening for connection */
        !            69: #define        TCPS_SYN_SENT           2       /* active, have sent syn */
        !            70: #define        TCPS_SYN_RECEIVED       3       /* have send and received syn */
        !            71: /* states < TCPS_ESTABLISHED are those where connections not established */
        !            72: #define        TCPS_ESTABLISHED        4       /* established */
        !            73: #define        TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
        !            74: /* states > TCPS_CLOSE_WAIT are those where user has closed */
        !            75: #define        TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
        !            76: #define        TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
        !            77: #define        TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
        !            78: /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
        !            79: #define        TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
        !            80: #define        TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
        !            81: 
        !            82: #define        TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
        !            83: #define TCPS_HAVEESTABLISHED(s)        ((s) >= TCPS_ESTABLISHED)
        !            84: #define        TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
        !            85: 
        !            86: #ifdef TCPOUTFLAGS
        !            87: /*
        !            88:  * Flags used when sending segments in tcp_output.
        !            89:  * Basic flags (TH_RST,TH_ACK,TH_SYN,TH_FIN) are totally
        !            90:  * determined by state, with the proviso that TH_FIN is sent only
        !            91:  * if all data queued for output is included in the segment.
        !            92:  */
        !            93: static u_char  tcp_outflags[TCP_NSTATES] = {
        !            94:     TH_RST|TH_ACK, 0, TH_SYN, TH_SYN|TH_ACK,
        !            95:     TH_ACK, TH_ACK,
        !            96:     TH_FIN|TH_ACK, TH_ACK, TH_FIN|TH_ACK, TH_ACK, TH_ACK,
        !            97: };
        !            98: #endif
        !            99: 
        !           100: #if KPROF
        !           101: int    tcp_acounts[TCP_NSTATES][PRU_NREQ];
        !           102: #endif
        !           103: 
        !           104: #ifdef TCPSTATES
        !           105: char *tcpstates[] = {
        !           106:        "CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD",
        !           107:        "ESTABLISHED",  "CLOSE_WAIT",   "FIN_WAIT_1",   "CLOSING",
        !           108:        "LAST_ACK",     "FIN_WAIT_2",   "TIME_WAIT",
        !           109: };
        !           110: #endif
        !           111: 
        !           112: #endif

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