1 /* $NetBSD: ip.h,v 1.1.1.2 2014/07/12 11:57:57 spz Exp $ */ 2 /* NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 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 * @(#)ip.h 8.1 (Berkeley) 6/10/93 33 */ 34 35 /* 36 * Definitions for internet protocol version 4. 37 * Per RFC 791, September 1981. 38 */ 39 #define IPVERSION 4 40 41 /* 42 * Structure of an internet header, naked of options. 43 * 44 * We declare ip_len and ip_off to be short, rather than u_short 45 * pragmatically since otherwise unsigned comparisons can result 46 * against negative integers quite easily, and fail in subtle ways. 47 */ 48 struct ip { 49 u_int8_t ip_fvhl; /* header length, version */ 50 u_int8_t ip_tos; /* type of service */ 51 int16_t ip_len; /* total length */ 52 u_int16_t ip_id; /* identification */ 53 int16_t ip_off; /* fragment offset field */ 54 #define IP_DF 0x4000 /* dont fragment flag */ 55 #define IP_MF 0x2000 /* more fragments flag */ 56 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 57 u_int8_t ip_ttl; /* time to live */ 58 u_int8_t ip_p; /* protocol */ 59 u_int16_t ip_sum; /* checksum */ 60 struct in_addr ip_src, ip_dst; /* source and dest address */ 61 }; 62 63 #define IP_V(iph) ((iph)->ip_fvhl >> 4) 64 #define IP_HL(iph) (((iph)->ip_fvhl & 0x0F) << 2) 65 #define IP_V_SET(iph,x) ((iph)->ip_fvhl = ((iph)->ip_fvhl & 0x0F) | ((x) << 4)) 66 #define IP_HL_SET(iph,x) ((iph)->ip_fvhl = \ 67 ((iph)->ip_fvhl & 0xF0) | (((x) >> 2) & 0x0F)) 68 69 #define IP_MAXPACKET 65535 /* maximum packet size */ 70 71 /* 72 * Definitions for IP type of service (ip_tos) 73 */ 74 #define IPTOS_LOWDELAY 0x10 75 #define IPTOS_THROUGHPUT 0x08 76 #define IPTOS_RELIABILITY 0x04 77 /* IPTOS_LOWCOST 0x02 XXX */ 78 79 /* 80 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 81 */ 82 #define IPTOS_PREC_NETCONTROL 0xe0 83 #define IPTOS_PREC_INTERNETCONTROL 0xc0 84 #define IPTOS_PREC_CRITIC_ECP 0xa0 85 #define IPTOS_PREC_FLASHOVERRIDE 0x80 86 #define IPTOS_PREC_FLASH 0x60 87 #define IPTOS_PREC_IMMEDIATE 0x40 88 #define IPTOS_PREC_PRIORITY 0x20 89 #define IPTOS_PREC_ROUTINE 0x00 90 91 /* 92 * Definitions for options. 93 */ 94 #define IPOPT_COPIED(o) ((o)&0x80) 95 #define IPOPT_CLASS(o) ((o)&0x60) 96 #define IPOPT_NUMBER(o) ((o)&0x1f) 97 98 #define IPOPT_CONTROL 0x00 99 #define IPOPT_RESERVED1 0x20 100 #define IPOPT_DEBMEAS 0x40 101 #define IPOPT_RESERVED2 0x60 102 103 #define IPOPT_EOL 0 /* end of option list */ 104 #define IPOPT_NOP 1 /* no operation */ 105 106 #define IPOPT_RR 7 /* record packet route */ 107 #define IPOPT_TS 68 /* timestamp */ 108 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 109 #define IPOPT_LSRR 131 /* loose source route */ 110 #define IPOPT_SATID 136 /* satnet id */ 111 #define IPOPT_SSRR 137 /* strict source route */ 112 113 /* 114 * Offsets to fields in options other than EOL and NOP. 115 */ 116 #define IPOPT_OPTVAL 0 /* option ID */ 117 #define IPOPT_OLEN 1 /* option length */ 118 #define IPOPT_OFFSET 2 /* offset within option */ 119 #define IPOPT_MINOFF 4 /* min value of above */ 120 121 /* 122 * Time stamp option structure. 123 */ 124 struct ip_timestamp { 125 u_int8_t ipt_code; /* IPOPT_TS */ 126 u_int8_t ipt_len; /* size of structure (variable) */ 127 u_int8_t ipt_ptr; /* index of current entry */ 128 u_int8_t ipt_flg_oflw; /* flags, see below, overflow counter */ 129 union ipt_timestamp { 130 u_int32_t ipt_time[1]; 131 struct ipt_ta { 132 struct in_addr ipt_addr; 133 u_int32_t ipt_time; 134 } ipt_ta[1]; 135 } ipt_timestamp; 136 }; 137 138 /* flag bits for ipt_flg */ 139 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 140 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 141 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 142 143 /* bits for security (not byte swapped) */ 144 #define IPOPT_SECUR_UNCLASS 0x0000 145 #define IPOPT_SECUR_CONFID 0xf135 146 #define IPOPT_SECUR_EFTO 0x789a 147 #define IPOPT_SECUR_MMMM 0xbc4d 148 #define IPOPT_SECUR_RESTR 0xaf13 149 #define IPOPT_SECUR_SECRET 0xd788 150 #define IPOPT_SECUR_TOPSECRET 0x6bc5 151 152 /* 153 * Internet implementation parameters. 154 */ 155 #define MAXTTL 255 /* maximum time to live (seconds) */ 156 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 157 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 158 #define IPTTLDEC 1 /* subtracted when forwarding */ 159 160 #define IP_MSS 576 /* default maximum segment size */ 161