1/* $OpenBSD: ip.h,v 1.12 2006/04/27 02:19:32 tedu 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#ifndef _NETINET_IP_H_ 36#define _NETINET_IP_H_ 37 38#include <sys/cdefs.h> 39#include <sys/types.h> 40#include <endian.h> 41#include <netinet/in.h> 42#include <netinet/in_systm.h> 43 44__BEGIN_DECLS 45 46/* 47 * Definitions for internet protocol version 4. 48 * Per RFC 791, September 1981. 49 */ 50#define IPVERSION 4 51 52/* 53 * Structure of an internet header, naked of options. 54 */ 55struct ip { 56#if BYTE_ORDER == LITTLE_ENDIAN 57 u_int32_t ip_hl:4, /* header length */ 58 ip_v:4; /* version */ 59#endif 60#if BYTE_ORDER == BIG_ENDIAN 61 u_int32_t ip_v:4, /* version */ 62 ip_hl:4; /* header length */ 63#endif 64 u_int8_t ip_tos; /* type of service */ 65 u_int16_t ip_len; /* total length */ 66 u_int16_t ip_id; /* identification */ 67 u_int16_t ip_off; /* fragment offset field */ 68#define IP_RF 0x8000 /* reserved fragment flag */ 69#define IP_DF 0x4000 /* dont fragment flag */ 70#define IP_MF 0x2000 /* more fragments flag */ 71#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 72 u_int8_t ip_ttl; /* time to live */ 73 u_int8_t ip_p; /* protocol */ 74 u_int16_t ip_sum; /* checksum */ 75 struct in_addr ip_src, ip_dst; /* source and dest address */ 76}; 77 78#define IP_MAXPACKET 65535 /* maximum packet size */ 79 80/* 81 * Definitions for IP type of service (ip_tos) 82 */ 83#define IPTOS_LOWDELAY 0x10 84#define IPTOS_THROUGHPUT 0x08 85#define IPTOS_RELIABILITY 0x04 86#define IPTOS_MINCOST 0x02 87#if 1 88/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 89#define IPTOS_CE 0x01 /* congestion experienced */ 90#define IPTOS_ECT 0x02 /* ECN-capable transport */ 91#endif 92 93/* 94 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 95 */ 96#define IPTOS_PREC_NETCONTROL 0xe0 97#define IPTOS_PREC_INTERNETCONTROL 0xc0 98#define IPTOS_PREC_CRITIC_ECP 0xa0 99#define IPTOS_PREC_FLASHOVERRIDE 0x80 100#define IPTOS_PREC_FLASH 0x60 101#define IPTOS_PREC_IMMEDIATE 0x40 102#define IPTOS_PREC_PRIORITY 0x20 103#define IPTOS_PREC_ROUTINE 0x00 104 105/* 106 * ECN (Explicit Congestion Notification) codepoints in RFC3168 107 * mapped to the lower 2 bits of the TOS field. 108 */ 109#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 110#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 111#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 112#define IPTOS_ECN_CE 0x03 /* congestion experienced */ 113#define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 114 115/* 116 * Definitions for options. 117 */ 118#define IPOPT_COPIED(o) ((o)&0x80) 119#define IPOPT_CLASS(o) ((o)&0x60) 120#define IPOPT_NUMBER(o) ((o)&0x1f) 121 122#define IPOPT_CONTROL 0x00 123#define IPOPT_RESERVED1 0x20 124#define IPOPT_DEBMEAS 0x40 125#define IPOPT_RESERVED2 0x60 126 127#define IPOPT_EOL 0 /* end of option list */ 128#define IPOPT_NOP 1 /* no operation */ 129 130#define IPOPT_RR 7 /* record packet route */ 131#define IPOPT_TS 68 /* timestamp */ 132#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 133#define IPOPT_LSRR 131 /* loose source route */ 134#define IPOPT_SATID 136 /* satnet id */ 135#define IPOPT_SSRR 137 /* strict source route */ 136 137/* 138 * Offsets to fields in options other than EOL and NOP. 139 */ 140#define IPOPT_OPTVAL 0 /* option ID */ 141#define IPOPT_OLEN 1 /* option length */ 142#define IPOPT_OFFSET 2 /* offset within option */ 143#define IPOPT_MINOFF 4 /* min value of above */ 144 145/* 146 * Time stamp option structure. 147 */ 148struct ip_timestamp { 149 u_int8_t ipt_code; /* IPOPT_TS */ 150 u_int8_t ipt_len; /* size of structure (variable) */ 151 u_int8_t ipt_ptr; /* index of current entry */ 152#if _BYTE_ORDER == _LITTLE_ENDIAN 153 u_int32_t ipt_flg:4, /* flags, see below */ 154 ipt_oflw:4; /* overflow counter */ 155#endif 156#if _BYTE_ORDER == _BIG_ENDIAN 157 u_int32_t ipt_oflw:4, /* overflow counter */ 158 ipt_flg:4; /* flags, see below */ 159#endif 160 union ipt_timestamp { 161 n_time ipt_time[1]; 162 struct ipt_ta { 163 struct in_addr ipt_addr; 164 n_time ipt_time; 165 } ipt_ta[1]; 166 } ipt_timestamp; 167}; 168 169/* flag bits for ipt_flg */ 170#define IPOPT_TS_TSONLY 0 /* timestamps only */ 171#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 172#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 173 174/* bits for security (not byte swapped) */ 175#define IPOPT_SECUR_UNCLASS 0x0000 176#define IPOPT_SECUR_CONFID 0xf135 177#define IPOPT_SECUR_EFTO 0x789a 178#define IPOPT_SECUR_MMMM 0xbc4d 179#define IPOPT_SECUR_RESTR 0xaf13 180#define IPOPT_SECUR_SECRET 0xd788 181#define IPOPT_SECUR_TOPSECRET 0x6bc5 182 183/* 184 * Internet implementation parameters. 185 */ 186#define MAXTTL 255 /* maximum time to live (seconds) */ 187#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 188#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 189#define IPTTLDEC 1 /* subtracted when forwarding */ 190 191#define IP_MSS 576 /* default maximum segment size */ 192 193/* 194 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 195 * checksums. For the Internet checksum, struct ipovly can be used instead. 196 * For stronger checksums, the real thing must be used. 197 */ 198struct ippseudo { 199 struct in_addr ippseudo_src; /* source internet address */ 200 struct in_addr ippseudo_dst; /* destination internet address */ 201 u_int8_t ippseudo_pad; /* pad, must be zero */ 202 u_int8_t ippseudo_p; /* protocol */ 203 u_int16_t ippseudo_len; /* protocol length */ 204}; 205 206/* BIONIC addition: declarations matching the Linux kernel */ 207/* some programs expect these... */ 208 209#define IPOPT_OPTVAL 0 210#define IPOPT_OLEN 1 211#define IPOPT_OFFSET 2 212#define IPOPT_MINOFF 4 213#define MAX_IPOPTLEN 40 214 215#define IPOPT_COPY 0x80 216#define IPOPT_CLASS_MASK 0x60 217#define IPOPT_NUMBER_MASK 0x1f 218 219#define IPOPT_CONTROL 0x00 220#define IPOPT_RESERVED1 0x20 221#define IPOPT_MEASUREMENT 0x40 222#define IPOPT_RESERVED2 0x60 223 224#define IPOPT_END (0 |IPOPT_CONTROL) 225#define IPOPT_NOOP (1 |IPOPT_CONTROL) 226#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) 227#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) 228#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) 229#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) 230 231struct iphdr { 232#if defined(__LITTLE_ENDIAN_BITFIELD) 233 uint8_t ihl :4, 234 version:4; 235#elif defined (__BIG_ENDIAN_BITFIELD) 236 uint8_t version:4, 237 ihl :4; 238#else 239#error "Please fix <asm/byteorder.h>" 240#endif 241 uint8_t tos; 242 uint16_t tot_len; 243 uint16_t id; 244 uint16_t frag_off; 245 uint8_t ttl; 246 uint8_t protocol; 247 uint16_t check; 248 int32_t saddr; 249 int32_t daddr; 250}; 251 252struct ip_auth_hdr { 253 uint8_t nexthdr; 254 uint8_t hdrlen; 255 uint16_t reserved; 256 uint32_t spi; 257 uint32_t seq_no; 258 uint8_t auth_data[0]; 259}; 260 261struct ip_esp_hdr { 262 uint32_t spi; 263 uint32_t seq_no; 264 uint8_t enc_data[0]; 265}; 266 267struct ip_comp_hdr { 268 uint8_t nexthdr; 269 uint8_t flags; 270 uint16_t cpi; 271}; 272 273__END_DECLS 274 275#endif /* _NETINET_IP_H_ */ 276