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