| 1 | /* |
| 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * from: @(#)ip.h 7.10 (Berkeley) 6/28/90 |
| 34 | * $Id: ip.h,v 1.2 1993/10/16 18:26:08 rgrimes Exp $ |
| 35 | */ |
| 36 | |
| 37 | #ifndef _NETINET_IP_H_ |
| 38 | #define _NETINET_IP_H_ 1 |
| 39 | |
| 40 | /* |
| 41 | * Definitions for internet protocol version 4. |
| 42 | * Per RFC 791, September 1981. |
| 43 | */ |
| 44 | #define IPVERSION 4 |
| 45 | |
| 46 | /* |
| 47 | * Structure of an internet header, naked of options. |
| 48 | * |
| 49 | * We declare ip_len and ip_off to be short, rather than u_short |
| 50 | * pragmatically since otherwise unsigned comparisons can result |
| 51 | * against negative integers quite easily, and fail in subtle ways. |
| 52 | */ |
| 53 | struct ip { |
| 54 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 55 | u_char ip_hl:4, /* header length */ |
| 56 | ip_v:4; /* version */ |
| 57 | #endif |
| 58 | #if BYTE_ORDER == BIG_ENDIAN |
| 59 | u_char ip_v:4, /* version */ |
| 60 | ip_hl:4; /* header length */ |
| 61 | #endif |
| 62 | u_char ip_tos; /* type of service */ |
| 63 | short ip_len; /* total length */ |
| 64 | u_short ip_id; /* identification */ |
| 65 | short ip_off; /* fragment offset field */ |
| 66 | #define IP_DF 0x4000 /* dont fragment flag */ |
| 67 | #define IP_MF 0x2000 /* more fragments flag */ |
| 68 | u_char ip_ttl; /* time to live */ |
| 69 | u_char ip_p; /* protocol */ |
| 70 | u_short ip_sum; /* checksum */ |
| 71 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
| 72 | }; |
| 73 | |
| 74 | #define IP_MAXPACKET 65535 /* maximum packet size */ |
| 75 | |
| 76 | /* |
| 77 | * Definitions for IP type of service (ip_tos) |
| 78 | */ |
| 79 | #define IPTOS_LOWDELAY 0x10 |
| 80 | #define IPTOS_THROUGHPUT 0x08 |
| 81 | #define IPTOS_RELIABILITY 0x04 |
| 82 | |
| 83 | /* |
| 84 | * Definitions for IP precedence (also in ip_tos) (hopefully unused) |
| 85 | */ |
| 86 | #define IPTOS_PREC_NETCONTROL 0xe0 |
| 87 | #define IPTOS_PREC_INTERNETCONTROL 0xc0 |
| 88 | #define IPTOS_PREC_CRITIC_ECP 0xa0 |
| 89 | #define IPTOS_PREC_FLASHOVERRIDE 0x80 |
| 90 | #define IPTOS_PREC_FLASH 0x60 |
| 91 | #define IPTOS_PREC_IMMEDIATE 0x40 |
| 92 | #define IPTOS_PREC_PRIORITY 0x20 |
| 93 | #define IPTOS_PREC_ROUTINE 0x10 |
| 94 | |
| 95 | /* |
| 96 | * Definitions for options. |
| 97 | */ |
| 98 | #define IPOPT_COPIED(o) ((o)&0x80) |
| 99 | #define IPOPT_CLASS(o) ((o)&0x60) |
| 100 | #define IPOPT_NUMBER(o) ((o)&0x1f) |
| 101 | |
| 102 | #define IPOPT_CONTROL 0x00 |
| 103 | #define IPOPT_RESERVED1 0x20 |
| 104 | #define IPOPT_DEBMEAS 0x40 |
| 105 | #define IPOPT_RESERVED2 0x60 |
| 106 | |
| 107 | #define IPOPT_EOL 0 /* end of option list */ |
| 108 | #define IPOPT_NOP 1 /* no operation */ |
| 109 | |
| 110 | #define IPOPT_RR 7 /* record packet route */ |
| 111 | #define IPOPT_TS 68 /* timestamp */ |
| 112 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
| 113 | #define IPOPT_LSRR 131 /* loose source route */ |
| 114 | #define IPOPT_SATID 136 /* satnet id */ |
| 115 | #define IPOPT_SSRR 137 /* strict source route */ |
| 116 | |
| 117 | /* |
| 118 | * Offsets to fields in options other than EOL and NOP. |
| 119 | */ |
| 120 | #define IPOPT_OPTVAL 0 /* option ID */ |
| 121 | #define IPOPT_OLEN 1 /* option length */ |
| 122 | #define IPOPT_OFFSET 2 /* offset within option */ |
| 123 | #define IPOPT_MINOFF 4 /* min value of above */ |
| 124 | |
| 125 | /* |
| 126 | * Time stamp option structure. |
| 127 | */ |
| 128 | struct ip_timestamp { |
| 129 | u_char ipt_code; /* IPOPT_TS */ |
| 130 | u_char ipt_len; /* size of structure (variable) */ |
| 131 | u_char ipt_ptr; /* index of current entry */ |
| 132 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 133 | u_char ipt_flg:4, /* flags, see below */ |
| 134 | ipt_oflw:4; /* overflow counter */ |
| 135 | #endif |
| 136 | #if BYTE_ORDER == BIG_ENDIAN |
| 137 | u_char ipt_oflw:4, /* overflow counter */ |
| 138 | ipt_flg:4; /* flags, see below */ |
| 139 | #endif |
| 140 | union ipt_timestamp { |
| 141 | n_long ipt_time[1]; |
| 142 | struct ipt_ta { |
| 143 | struct in_addr ipt_addr; |
| 144 | n_long ipt_time; |
| 145 | } ipt_ta[1]; |
| 146 | } ipt_timestamp; |
| 147 | }; |
| 148 | |
| 149 | /* flag bits for ipt_flg */ |
| 150 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ |
| 151 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ |
| 152 | #define IPOPT_TS_PRESPEC 3 /* specified modules only */ |
| 153 | |
| 154 | /* bits for security (not byte swapped) */ |
| 155 | #define IPOPT_SECUR_UNCLASS 0x0000 |
| 156 | #define IPOPT_SECUR_CONFID 0xf135 |
| 157 | #define IPOPT_SECUR_EFTO 0x789a |
| 158 | #define IPOPT_SECUR_MMMM 0xbc4d |
| 159 | #define IPOPT_SECUR_RESTR 0xaf13 |
| 160 | #define IPOPT_SECUR_SECRET 0xd788 |
| 161 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 |
| 162 | |
| 163 | /* |
| 164 | * Internet implementation parameters. |
| 165 | */ |
| 166 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
| 167 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */ |
| 168 | #define IPTTLDEC 1 /* subtracted when forwarding */ |
| 169 | |
| 170 | #define IP_MSS 576 /* default maximum segment size */ |
| 171 | #endif /* _NETINET_IP_H_ */ |