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Annotation of XNU/bsd/netinet/tcp.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.h       8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #ifndef _NETINET_TCP_H_
        !            58: #define _NETINET_TCP_H_
        !            59: 
        !            60: typedef        u_int32_t tcp_seq;
        !            61: typedef u_int32_t tcp_cc;              /* connection count per rfc1644 */
        !            62: 
        !            63: /*
        !            64:  * TCP header.
        !            65:  * Per RFC 793, September, 1981.
        !            66:  */
        !            67: struct tcphdr {
        !            68:        u_short th_sport;               /* source port */
        !            69:        u_short th_dport;               /* destination port */
        !            70:        tcp_seq th_seq;                 /* sequence number */
        !            71:        tcp_seq th_ack;                 /* acknowledgement number */
        !            72: #if BYTE_ORDER == LITTLE_ENDIAN
        !            73:        u_int   th_x2:4,                /* (unused) */
        !            74:                th_off:4;               /* data offset */
        !            75: #endif
        !            76: #if BYTE_ORDER == BIG_ENDIAN
        !            77:        u_int   th_off:4,               /* data offset */
        !            78:                th_x2:4;                /* (unused) */
        !            79: #endif
        !            80:        u_char  th_flags;
        !            81: #define        TH_FIN  0x01
        !            82: #define        TH_SYN  0x02
        !            83: #define        TH_RST  0x04
        !            84: #define        TH_PUSH 0x08
        !            85: #define        TH_ACK  0x10
        !            86: #define        TH_URG  0x20
        !            87: #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG)
        !            88: 
        !            89:        u_short th_win;                 /* window */
        !            90:        u_short th_sum;                 /* checksum */
        !            91:        u_short th_urp;                 /* urgent pointer */
        !            92: };
        !            93: 
        !            94: #define        TCPOPT_EOL              0
        !            95: #define        TCPOPT_NOP              1
        !            96: #define        TCPOPT_MAXSEG           2
        !            97: #define    TCPOLEN_MAXSEG              4
        !            98: #define TCPOPT_WINDOW          3
        !            99: #define    TCPOLEN_WINDOW              3
        !           100: #define TCPOPT_SACK_PERMITTED  4               /* Experimental */
        !           101: #define    TCPOLEN_SACK_PERMITTED      2
        !           102: #define TCPOPT_SACK            5               /* Experimental */
        !           103: #define TCPOPT_TIMESTAMP       8
        !           104: #define    TCPOLEN_TIMESTAMP           10
        !           105: #define    TCPOLEN_TSTAMP_APPA         (TCPOLEN_TIMESTAMP+2) /* appendix A */
        !           106: #define    TCPOPT_TSTAMP_HDR           \
        !           107:     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
        !           108: 
        !           109: #define        TCPOPT_CC               11              /* CC options: RFC-1644 */
        !           110: #define TCPOPT_CCNEW           12
        !           111: #define TCPOPT_CCECHO          13
        !           112: #define           TCPOLEN_CC                   6
        !           113: #define           TCPOLEN_CC_APPA              (TCPOLEN_CC+2)
        !           114: #define           TCPOPT_CC_HDR(ccopt)         \
        !           115:     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
        !           116: 
        !           117: /*
        !           118:  * Default maximum segment size for TCP.
        !           119:  * With an IP MSS of 576, this is 536,
        !           120:  * but 512 is probably more convenient.
        !           121:  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
        !           122:  */
        !           123: #define        TCP_MSS 512
        !           124: 
        !           125: #define        TCP_MAXWIN      65535   /* largest value for (unscaled) window */
        !           126: #define        TTCP_CLIENT_SND_WND     4096    /* dflt send window for T/TCP client */
        !           127: 
        !           128: #define TCP_MAX_WINSHIFT       14      /* maximum window shift */
        !           129: 
        !           130: #define TCP_MAXHLEN    (0xf<<2)        /* max length of header in bytes */
        !           131: #define TCP_MAXOLEN    (TCP_MAXHLEN - sizeof(struct tcphdr))
        !           132:                                        /* max space left for options */
        !           133: 
        !           134: /*
        !           135:  * User-settable options (used with setsockopt).
        !           136:  */
        !           137: #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
        !           138: #define        TCP_MAXSEG      0x02    /* set maximum segment size */
        !           139: #define TCP_NOPUSH     0x04    /* don't push last block of write */
        !           140: #define TCP_NOOPT      0x08    /* don't use TCP options */
        !           141: 
        !           142: #endif

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