1 | /* |
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2 | * Copyright (c) 1982, 1986, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. All advertising materials mentioning features or use of this software |
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14 | * must display the following acknowledgement: |
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15 | * This product includes software developed by the University of |
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16 | * California, Berkeley and its contributors. |
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17 | * 4. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | * |
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33 | * @(#)tcp.h 8.1 (Berkeley) 6/10/93 |
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34 | * $Id$ |
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35 | */ |
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36 | |
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37 | #ifndef _NETINET_TCP_H_ |
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38 | #define _NETINET_TCP_H_ |
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39 | |
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40 | typedef u_long tcp_seq; |
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41 | typedef u_long tcp_cc; /* connection count per rfc1644 */ |
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42 | |
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43 | /* |
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44 | * TCP header. |
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45 | * Per RFC 793, September, 1981. |
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46 | */ |
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47 | struct tcphdr { |
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48 | u_short th_sport BYTE_PACK; /* source port */ |
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49 | u_short th_dport BYTE_PACK; /* destination port */ |
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50 | tcp_seq th_seq BYTE_PACK; /* sequence number */ |
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51 | tcp_seq th_ack BYTE_PACK; /* acknowledgement number */ |
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52 | #if BYTE_ORDER == LITTLE_ENDIAN |
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53 | u_char th_x2:4, /* (unused) */ |
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54 | th_off:4; /* data offset */ |
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55 | #endif |
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56 | #if BYTE_ORDER == BIG_ENDIAN |
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57 | u_char th_off:4, /* data offset */ |
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58 | th_x2:4; /* (unused) */ |
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59 | #endif |
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60 | u_char th_flags; |
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61 | #define TH_FIN 0x01 |
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62 | #define TH_SYN 0x02 |
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63 | #define TH_RST 0x04 |
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64 | #define TH_PUSH 0x08 |
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65 | #define TH_ACK 0x10 |
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66 | #define TH_URG 0x20 |
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67 | #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG) |
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68 | |
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69 | u_short th_win BYTE_PACK; /* window */ |
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70 | u_short th_sum BYTE_PACK; /* checksum */ |
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71 | u_short th_urp BYTE_PACK; /* urgent pointer */ |
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72 | }; |
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73 | |
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74 | #define TCPOPT_EOL 0 |
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75 | #define TCPOPT_NOP 1 |
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76 | #define TCPOPT_MAXSEG 2 |
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77 | #define TCPOLEN_MAXSEG 4 |
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78 | #define TCPOPT_WINDOW 3 |
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79 | #define TCPOLEN_WINDOW 3 |
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80 | #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ |
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81 | #define TCPOLEN_SACK_PERMITTED 2 |
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82 | #define TCPOPT_SACK 5 /* Experimental */ |
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83 | #define TCPOPT_TIMESTAMP 8 |
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84 | #define TCPOLEN_TIMESTAMP 10 |
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85 | #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ |
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86 | #define TCPOPT_TSTAMP_HDR \ |
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87 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) |
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88 | |
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89 | #define TCPOPT_CC 11 /* CC options: RFC-1644 */ |
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90 | #define TCPOPT_CCNEW 12 |
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91 | #define TCPOPT_CCECHO 13 |
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92 | #define TCPOLEN_CC 6 |
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93 | #define TCPOLEN_CC_APPA (TCPOLEN_CC+2) |
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94 | #define TCPOPT_CC_HDR(ccopt) \ |
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95 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC) |
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96 | |
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97 | /* |
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98 | * Default maximum segment size for TCP. |
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99 | * With an IP MSS of 576, this is 536, |
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100 | * but 512 is probably more convenient. |
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101 | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). |
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102 | */ |
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103 | #define TCP_MSS 512 |
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104 | |
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105 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
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106 | #define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */ |
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107 | |
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108 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ |
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109 | |
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110 | #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */ |
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111 | #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr)) |
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112 | /* max space left for options */ |
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113 | |
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114 | /* |
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115 | * User-settable options (used with setsockopt). |
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116 | */ |
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117 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ |
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118 | #define TCP_MAXSEG 0x02 /* set maximum segment size */ |
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119 | #define TCP_NOPUSH 0x04 /* don't push last block of write */ |
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120 | #define TCP_NOOPT 0x08 /* don't use TCP options */ |
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121 | |
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122 | #endif |
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