ip.h revision 331722
1/*- 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)ip.h 8.2 (Berkeley) 6/1/94 31 * $FreeBSD: stable/11/sys/netinet/ip.h 331722 2018-03-29 02:50:57Z eadler $ 32 */ 33 34#ifndef _NETINET_IP_H_ 35#define _NETINET_IP_H_ 36 37#include <sys/cdefs.h> 38 39/* 40 * Definitions for internet protocol version 4. 41 * 42 * Per RFC 791, September 1981. 43 */ 44#define IPVERSION 4 45 46/* 47 * Structure of an internet header, naked of options. 48 */ 49struct ip { 50#if BYTE_ORDER == LITTLE_ENDIAN 51 u_char ip_hl:4, /* header length */ 52 ip_v:4; /* version */ 53#endif 54#if BYTE_ORDER == BIG_ENDIAN 55 u_char ip_v:4, /* version */ 56 ip_hl:4; /* header length */ 57#endif 58 u_char ip_tos; /* type of service */ 59 u_short ip_len; /* total length */ 60 u_short ip_id; /* identification */ 61 u_short 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_char ip_ttl; /* time to live */ 67 u_char ip_p; /* protocol */ 68 u_short ip_sum; /* checksum */ 69 struct in_addr ip_src,ip_dst; /* source and dest address */ 70} __packed __aligned(2); 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 82/* 83 * Definitions for IP precedence (also in ip_tos) (deprecated). 84 */ 85#define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7 86#define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6 87#define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5 88#define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4 89#define IPTOS_PREC_FLASH IPTOS_DSCP_CS3 90#define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2 91#define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1 92#define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0 93 94/* 95 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865. 96 */ 97#define IPTOS_DSCP_CS0 0x00 98#define IPTOS_DSCP_CS1 0x20 99#define IPTOS_DSCP_AF11 0x28 100#define IPTOS_DSCP_AF12 0x30 101#define IPTOS_DSCP_AF13 0x38 102#define IPTOS_DSCP_CS2 0x40 103#define IPTOS_DSCP_AF21 0x48 104#define IPTOS_DSCP_AF22 0x50 105#define IPTOS_DSCP_AF23 0x58 106#define IPTOS_DSCP_CS3 0x60 107#define IPTOS_DSCP_AF31 0x68 108#define IPTOS_DSCP_AF32 0x70 109#define IPTOS_DSCP_AF33 0x78 110#define IPTOS_DSCP_CS4 0x80 111#define IPTOS_DSCP_AF41 0x88 112#define IPTOS_DSCP_AF42 0x90 113#define IPTOS_DSCP_AF43 0x98 114#define IPTOS_DSCP_CS5 0xa0 115#define IPTOS_DSCP_VA 0xb0 116#define IPTOS_DSCP_EF 0xb8 117#define IPTOS_DSCP_CS6 0xc0 118#define IPTOS_DSCP_CS7 0xe0 119 120/* 121 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the 122 * lower 2 bits of the TOS field. 123 */ 124#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 125#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 126#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 127#define IPTOS_ECN_CE 0x03 /* congestion experienced */ 128#define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 129 130/* 131 * Definitions for options. 132 */ 133#define IPOPT_COPIED(o) ((o)&0x80) 134#define IPOPT_CLASS(o) ((o)&0x60) 135#define IPOPT_NUMBER(o) ((o)&0x1f) 136 137#define IPOPT_CONTROL 0x00 138#define IPOPT_RESERVED1 0x20 139#define IPOPT_DEBMEAS 0x40 140#define IPOPT_RESERVED2 0x60 141 142#define IPOPT_EOL 0 /* end of option list */ 143#define IPOPT_NOP 1 /* no operation */ 144 145#define IPOPT_RR 7 /* record packet route */ 146#define IPOPT_TS 68 /* timestamp */ 147#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 148#define IPOPT_LSRR 131 /* loose source route */ 149#define IPOPT_ESO 133 /* extended security */ 150#define IPOPT_CIPSO 134 /* commercial security */ 151#define IPOPT_SATID 136 /* satnet id */ 152#define IPOPT_SSRR 137 /* strict source route */ 153#define IPOPT_RA 148 /* router alert */ 154 155/* 156 * Offsets to fields in options other than EOL and NOP. 157 */ 158#define IPOPT_OPTVAL 0 /* option ID */ 159#define IPOPT_OLEN 1 /* option length */ 160#define IPOPT_OFFSET 2 /* offset within option */ 161#define IPOPT_MINOFF 4 /* min value of above */ 162 163/* 164 * Time stamp option structure. 165 */ 166struct ip_timestamp { 167 u_char ipt_code; /* IPOPT_TS */ 168 u_char ipt_len; /* size of structure (variable) */ 169 u_char ipt_ptr; /* index of current entry */ 170#if BYTE_ORDER == LITTLE_ENDIAN 171 u_char ipt_flg:4, /* flags, see below */ 172 ipt_oflw:4; /* overflow counter */ 173#endif 174#if BYTE_ORDER == BIG_ENDIAN 175 u_char ipt_oflw:4, /* overflow counter */ 176 ipt_flg:4; /* flags, see below */ 177#endif 178 union ipt_timestamp { 179 uint32_t ipt_time[1]; /* network format */ 180 struct ipt_ta { 181 struct in_addr ipt_addr; 182 uint32_t ipt_time; /* network format */ 183 } ipt_ta[1]; 184 } ipt_timestamp; 185}; 186 187/* Flag bits for ipt_flg. */ 188#define IPOPT_TS_TSONLY 0 /* timestamps only */ 189#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 190#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 191 192/* Bits for security (not byte swapped). */ 193#define IPOPT_SECUR_UNCLASS 0x0000 194#define IPOPT_SECUR_CONFID 0xf135 195#define IPOPT_SECUR_EFTO 0x789a 196#define IPOPT_SECUR_MMMM 0xbc4d 197#define IPOPT_SECUR_RESTR 0xaf13 198#define IPOPT_SECUR_SECRET 0xd788 199#define IPOPT_SECUR_TOPSECRET 0x6bc5 200 201/* 202 * Internet implementation parameters. 203 */ 204#define MAXTTL 255 /* maximum time to live (seconds) */ 205#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 206#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 207#define IPTTLDEC 1 /* subtracted when forwarding */ 208#define IP_MSS 576 /* default maximum segment size */ 209 210/* 211 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 212 * checksums. For the Internet checksum, struct ipovly can be used instead. 213 * For stronger checksums, the real thing must be used. 214 */ 215struct ippseudo { 216 struct in_addr ippseudo_src; /* source internet address */ 217 struct in_addr ippseudo_dst; /* destination internet address */ 218 u_char ippseudo_pad; /* pad, must be zero */ 219 u_char ippseudo_p; /* protocol */ 220 u_short ippseudo_len; /* protocol length */ 221}; 222#endif 223