1 /* $OpenBSD: ip.h,v 1.7 2001/06/09 07:03:41 angelos 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ip.h 8.1 (Berkeley) 6/10/93 37 */ 38 39 #ifndef _NETINET_IP_H_ 40 #define _NETINET_IP_H_ 41 42 /* 43 * Definitions for internet protocol version 4. 44 * Per RFC 791, September 1981. 45 */ 46 #define IPVERSION 4 47 48 /* 49 * Structure of an internet header, naked of options. 50 */ 51 struct ip { 52 #if BYTE_ORDER == LITTLE_ENDIAN 53 u_int8_t ip_hl:4, /* header length */ 54 ip_v:4; /* version */ 55 #endif 56 #if BYTE_ORDER == BIG_ENDIAN 57 u_int8_t ip_v:4, /* version */ 58 ip_hl:4; /* header length */ 59 #endif 60 u_int8_t ip_tos; /* type of service */ 61 u_int16_t ip_len; /* total length */ 62 u_int16_t ip_id; /* identification */ 63 u_int16_t ip_off; /* fragment offset field */ 64 #define IP_RF 0x8000 /* reserved fragment flag */ 65 #define IP_DF 0x4000 /* dont fragment flag */ 66 #define IP_MF 0x2000 /* more fragments flag */ 67 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 68 u_int8_t ip_ttl; /* time to live */ 69 u_int8_t ip_p; /* protocol */ 70 u_int16_t 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 /* IPTOS_LOWCOST 0x02 XXX */ 83 #if 1 84 /* ECN bits proposed by Sally Floyd */ 85 #define IPTOS_CE 0x01 /* congestion experienced */ 86 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 87 #endif 88 89 /* 90 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 91 */ 92 #define IPTOS_PREC_NETCONTROL 0xe0 93 #define IPTOS_PREC_INTERNETCONTROL 0xc0 94 #define IPTOS_PREC_CRITIC_ECP 0xa0 95 #define IPTOS_PREC_FLASHOVERRIDE 0x80 96 #define IPTOS_PREC_FLASH 0x60 97 #define IPTOS_PREC_IMMEDIATE 0x40 98 #define IPTOS_PREC_PRIORITY 0x20 99 #define IPTOS_PREC_ROUTINE 0x00 100 101 /* 102 * Definitions for options. 103 */ 104 #define IPOPT_COPIED(o) ((o)&0x80) 105 #define IPOPT_CLASS(o) ((o)&0x60) 106 #define IPOPT_NUMBER(o) ((o)&0x1f) 107 108 #define IPOPT_CONTROL 0x00 109 #define IPOPT_RESERVED1 0x20 110 #define IPOPT_DEBMEAS 0x40 111 #define IPOPT_RESERVED2 0x60 112 113 #define IPOPT_EOL 0 /* end of option list */ 114 #define IPOPT_NOP 1 /* no operation */ 115 116 #define IPOPT_RR 7 /* record packet route */ 117 #define IPOPT_TS 68 /* timestamp */ 118 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 119 #define IPOPT_LSRR 131 /* loose source route */ 120 #define IPOPT_SATID 136 /* satnet id */ 121 #define IPOPT_SSRR 137 /* strict source route */ 122 123 /* 124 * Offsets to fields in options other than EOL and NOP. 125 */ 126 #define IPOPT_OPTVAL 0 /* option ID */ 127 #define IPOPT_OLEN 1 /* option length */ 128 #define IPOPT_OFFSET 2 /* offset within option */ 129 #define IPOPT_MINOFF 4 /* min value of above */ 130 131 /* 132 * Time stamp option structure. 133 */ 134 struct ip_timestamp { 135 u_int8_t ipt_code; /* IPOPT_TS */ 136 u_int8_t ipt_len; /* size of structure (variable) */ 137 u_int8_t ipt_ptr; /* index of current entry */ 138 #if BYTE_ORDER == LITTLE_ENDIAN 139 u_int8_t ipt_flg:4, /* flags, see below */ 140 ipt_oflw:4; /* overflow counter */ 141 #endif 142 #if BYTE_ORDER == BIG_ENDIAN 143 u_int8_t ipt_oflw:4, /* overflow counter */ 144 ipt_flg:4; /* flags, see below */ 145 #endif 146 union ipt_timestamp { 147 n_time ipt_time[1]; 148 struct ipt_ta { 149 struct in_addr ipt_addr; 150 n_time ipt_time; 151 } ipt_ta[1]; 152 } ipt_timestamp; 153 }; 154 155 /* flag bits for ipt_flg */ 156 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 157 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 158 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 159 160 /* bits for security (not byte swapped) */ 161 #define IPOPT_SECUR_UNCLASS 0x0000 162 #define IPOPT_SECUR_CONFID 0xf135 163 #define IPOPT_SECUR_EFTO 0x789a 164 #define IPOPT_SECUR_MMMM 0xbc4d 165 #define IPOPT_SECUR_RESTR 0xaf13 166 #define IPOPT_SECUR_SECRET 0xd788 167 #define IPOPT_SECUR_TOPSECRET 0x6bc5 168 169 /* 170 * Internet implementation parameters. 171 */ 172 #define MAXTTL 255 /* maximum time to live (seconds) */ 173 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 174 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 175 #define IPTTLDEC 1 /* subtracted when forwarding */ 176 177 #define IP_MSS 576 /* default maximum segment size */ 178 179 /* 180 * This is the real IPv4 psuedo header, used for computing the TCP and UDP 181 * checksums. For the Internet checksum, struct ipovly can be used instead. 182 * For stronger checksums, the real thing must be used. 183 */ 184 struct ippseudo { 185 struct in_addr ippseudo_src; /* source internet address */ 186 struct in_addr ippseudo_dst; /* destination internet address */ 187 u_int8_t ippseudo_pad; /* pad, must be zero */ 188 u_int8_t ippseudo_p; /* protocol */ 189 u_int16_t ippseudo_len; /* protocol length */ 190 }; 191 #endif /* _NETINET_IP_H_ */ 192