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Annotation of sys/netinet/tcp.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: tcp.h,v 1.17 2006/04/27 02:19:32 tedu Exp $   */
                      2: /*     $NetBSD: tcp.h,v 1.8 1995/04/17 05:32:58 cgd 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.h       8.1 (Berkeley) 6/10/93
                     33:  */
                     34:
                     35: #ifndef _NETINET_TCP_H_
                     36: #define        _NETINET_TCP_H_
                     37:
                     38: typedef u_int32_t tcp_seq;
                     39:
                     40: /*
                     41:  * TCP header.
                     42:  * Per RFC 793, September, 1981.
                     43:  */
                     44: struct tcphdr {
                     45:        u_int16_t th_sport;             /* source port */
                     46:        u_int16_t th_dport;             /* destination port */
                     47:        tcp_seq   th_seq;               /* sequence number */
                     48:        tcp_seq   th_ack;               /* acknowledgement number */
                     49: #if _BYTE_ORDER == _LITTLE_ENDIAN
                     50:        u_int     th_x2:4,              /* (unused) */
                     51:                  th_off:4;             /* data offset */
                     52: #endif
                     53: #if _BYTE_ORDER == _BIG_ENDIAN
                     54:        u_int     th_off:4,             /* data offset */
                     55:                  th_x2:4;              /* (unused) */
                     56: #endif
                     57:        u_int8_t  th_flags;
                     58: #define        TH_FIN    0x01
                     59: #define        TH_SYN    0x02
                     60: #define        TH_RST    0x04
                     61: #define        TH_PUSH   0x08
                     62: #define        TH_ACK    0x10
                     63: #define        TH_URG    0x20
                     64: #define        TH_ECE    0x40
                     65: #define        TH_CWR    0x80
                     66:        u_int16_t th_win;                       /* window */
                     67:        u_int16_t th_sum;                       /* checksum */
                     68:        u_int16_t th_urp;                       /* urgent pointer */
                     69: };
                     70: #define th_reseqlen th_urp                     /* TCP data length for
                     71:                                                   resequencing/reassembly */
                     72:
                     73: #define        TCPOPT_EOL              0
                     74: #define        TCPOPT_NOP              1
                     75: #define        TCPOPT_MAXSEG           2
                     76: #define           TCPOLEN_MAXSEG               4
                     77: #define        TCPOPT_WINDOW           3
                     78: #define           TCPOLEN_WINDOW               3
                     79: #define        TCPOPT_SACK_PERMITTED   4               /* Experimental */
                     80: #define           TCPOLEN_SACK_PERMITTED       2
                     81: #define        TCPOPT_SACK             5               /* Experimental */
                     82: #define        TCPOLEN_SACK            8               /* 2*sizeof(tcp_seq) */
                     83: #define        TCPOPT_TIMESTAMP        8
                     84: #define           TCPOLEN_TIMESTAMP            10
                     85: #define           TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
                     86: #define        TCPOPT_SIGNATURE        19
                     87: #define           TCPOLEN_SIGNATURE            18
                     88: #define           TCPOLEN_SIGLEN               (TCPOLEN_SIGNATURE+2) /* padding */
                     89:
                     90: #define        MAX_TCPOPTLEN           40      /* Absolute maximum TCP options len */
                     91:
                     92: #define TCPOPT_TSTAMP_HDR      \
                     93:     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
                     94:
                     95: /* Option definitions */
                     96: #define TCPOPT_SACK_PERMIT_HDR \
                     97: (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)
                     98: #define TCPOPT_SACK_HDR   (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8)
                     99: /* Miscellaneous constants */
                    100: #define MAX_SACK_BLKS  6       /* Max # SACK blocks stored at sender side */
                    101: #define TCP_MAX_SACK   3       /* MAX # SACKs sent in any segment */
                    102:
                    103: #define TCP_MAXBURST   4       /* Max # packets after leaving Fast Rxmit */
                    104:
                    105: /*
                    106:  * Default maximum segment size for TCP.
                    107:  * With an IP MSS of 576, this is 536,
                    108:  * but 512 is probably more convenient.
                    109:  * This should be defined as min(512, IP_MSS - sizeof (struct tcpiphdr)).
                    110:  */
                    111: #define        TCP_MSS         512
                    112:
                    113: #define        TCP_MAXWIN      65535   /* largest value for (unscaled) window */
                    114:
                    115: #define        TCP_MAX_WINSHIFT        14      /* maximum window shift */
                    116:
                    117: /*
                    118:  * User-settable options (used with setsockopt).
                    119:  */
                    120: #define        TCP_NODELAY             0x01   /* don't delay send to coalesce pkts */
                    121: #define        TCP_MAXSEG              0x02   /* set maximum segment size */
                    122: #define        TCP_MD5SIG              0x04   /* enable TCP MD5 signature option */
                    123: #define        TCP_SACK_ENABLE         0x08   /* enable SACKs (if disabled by def.) */
                    124:
                    125: #endif /* _NETINET_TCP_H_ */