usr/src/uts/common/netinet/tcp.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
  25  */
  26
  27 /*
  28  * Copyright (c) 1982, 1986 Regents of the University of California.
  29  * All rights reserved.  The Berkeley software License Agreement
  30  * specifies the terms and conditions for redistribution.
  31  */
  32
  33 #ifndef _NETINET_TCP_H
  34 #define _NETINET_TCP_H
  35
  36 /* tcp.h 1.11 88/08/19 SMI; from UCB 7.2 10/28/86       */
  37
  38
  39 #include <sys/isa_defs.h>
  40 #include <sys/inttypes.h>
  41
  42 #ifdef  __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 typedef uint32_t        tcp_seq;
  47 /*
  48  * TCP header.
  49  * Per RFC 793, September, 1981.
  50  */
  51 struct tcphdr {
  52         uint16_t        th_sport;       /* source port */
  53         uint16_t        th_dport;       /* destination port */
  54         tcp_seq         th_seq;         /* sequence number */
  55         tcp_seq         th_ack;         /* acknowledgement number */
  56 #ifdef _BIT_FIELDS_LTOH
  57         uint_t  th_x2:4,                /* (unused) */
  58                 th_off:4;               /* data offset */
  59 #else
  60         uint_t  th_off:4,               /* data offset */
  61                 th_x2:4;                /* (unused) */
  62 #endif
  63         uchar_t th_flags;
  64 #define TH_FIN  0x01
  65 #define TH_SYN  0x02
  66 #define TH_RST  0x04
  67 #define TH_PUSH 0x08
  68 #define TH_ACK  0x10
  69 #define TH_URG  0x20
  70 #define TH_ECE  0x40
  71 #define TH_CWR  0x80
  72         uint16_t        th_win;         /* window */
  73         uint16_t        th_sum;         /* checksum */
  74         uint16_t        th_urp;         /* urgent pointer */
  75 };
  76
  77 #define TCPOPT_EOL      0
  78 #define TCPOPT_NOP      1
  79 #define TCPOPT_MAXSEG   2
  80 #define TCPOPT_WSCALE   3
  81 #define TCPOPT_SACK_PERMITTED   4
  82 #define TCPOPT_SACK     5
  83 #define TCPOPT_TSTAMP   8
  84
  85 /*
  86  * Default maximum segment size for TCP.
  87  * With an IP MTU of 576, this is 536.
  88  */
  89 #define TCP_MSS 536
  90
  91 /*
  92  * Options for use with [gs]etsockopt at the TCP level.
  93  *
  94  * Note: Some of the TCP_ namespace has conflict with and
  95  * and is exposed through <xti.h>. (It also requires exposing
  96  * options not implemented). The options with potential
  97  * for conflicts use #ifndef guards.
  98  */
  99 #ifndef TCP_NODELAY
 100 #define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
 101 #endif
 102
 103 #ifndef TCP_MAXSEG
 104 #define TCP_MAXSEG      0x02    /* set maximum segment size */
 105 #endif
 106
 107 #ifndef TCP_KEEPALIVE
 108 #define TCP_KEEPALIVE   0x8     /* set keepalive timer */
 109 #endif
 110
 111
 112 #define TCP_NOTIFY_THRESHOLD            0x10
 113 #define TCP_ABORT_THRESHOLD             0x11
 114 #define TCP_CONN_NOTIFY_THRESHOLD       0x12
 115 #define TCP_CONN_ABORT_THRESHOLD        0x13
 116 #define TCP_RECVDSTADDR                 0x14
 117 #define TCP_INIT_CWND                   0x15
 118 #define TCP_KEEPALIVE_THRESHOLD         0x16
 119 #define TCP_KEEPALIVE_ABORT_THRESHOLD   0x17
 120 #define TCP_CORK                        0x18
 121 #define TCP_RTO_INITIAL                 0x19
 122 #define TCP_RTO_MIN                     0x1A
 123 #define TCP_RTO_MAX                     0x1B
 124 #define TCP_LINGER2                     0x1C
 125
 126 /* gap for expansion of ``standard'' options */
 127 #define TCP_ANONPRIVBIND                0x20    /* for internal use only  */
 128 #define TCP_EXCLBIND                    0x21    /* for internal use only  */
 129 #define TCP_KEEPIDLE                    0x22
 130 #define TCP_KEEPCNT                     0x23
 131 #define TCP_KEEPINTVL                   0x24
 132
 133 #ifdef  __cplusplus
 134 }
 135 #endif
 136
 137 #endif  /* _NETINET_TCP_H */