ip.h revision 203343
1139823Simp/*- 21541Srgrimes * Copyright (c) 1982, 1986, 1993 3169466Srwatson * The Regents of the University of California. 4169466Srwatson * All rights reserved. 51541Srgrimes * 61541Srgrimes * Redistribution and use in source and binary forms, with or without 71541Srgrimes * modification, are permitted provided that the following conditions 81541Srgrimes * are met: 91541Srgrimes * 1. Redistributions of source code must retain the above copyright 101541Srgrimes * notice, this list of conditions and the following disclaimer. 111541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 121541Srgrimes * notice, this list of conditions and the following disclaimer in the 131541Srgrimes * documentation and/or other materials provided with the distribution. 141541Srgrimes * 4. Neither the name of the University nor the names of its contributors 151541Srgrimes * may be used to endorse or promote products derived from this software 161541Srgrimes * without specific prior written permission. 171541Srgrimes * 181541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 191541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 201541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 211541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 221541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 231541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 241541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 251541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 261541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 271541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 281541Srgrimes * SUCH DAMAGE. 291541Srgrimes * 3010942Swollman * @(#)ip.h 8.2 (Berkeley) 6/1/94 3150477Speter * $FreeBSD: head/sys/netinet/ip.h 203343 2010-02-01 14:13:44Z luigi $ 321541Srgrimes */ 331541Srgrimes 342169Spaul#ifndef _NETINET_IP_H_ 35169466Srwatson#define _NETINET_IP_H_ 362169Spaul 37112482Smux#include <sys/cdefs.h> 38112482Smux 391541Srgrimes/* 401541Srgrimes * Definitions for internet protocol version 4. 41169466Srwatson * 421541Srgrimes * Per RFC 791, September 1981. 431541Srgrimes */ 441541Srgrimes#define IPVERSION 4 451541Srgrimes 461541Srgrimes/* 471541Srgrimes * Structure of an internet header, naked of options. 481541Srgrimes */ 491541Srgrimesstruct ip { 508876Srgrimes#if BYTE_ORDER == LITTLE_ENDIAN 51203343Sluigi u_char ip_hl:4, /* header length */ 521541Srgrimes ip_v:4; /* version */ 531541Srgrimes#endif 548876Srgrimes#if BYTE_ORDER == BIG_ENDIAN 55203343Sluigi u_char ip_v:4, /* version */ 561541Srgrimes ip_hl:4; /* header length */ 571541Srgrimes#endif 581541Srgrimes u_char ip_tos; /* type of service */ 5919136Swollman u_short ip_len; /* total length */ 601541Srgrimes u_short ip_id; /* identification */ 6119136Swollman u_short ip_off; /* fragment offset field */ 6233851Sdima#define IP_RF 0x8000 /* reserved fragment flag */ 631541Srgrimes#define IP_DF 0x4000 /* dont fragment flag */ 641541Srgrimes#define IP_MF 0x2000 /* more fragments flag */ 651541Srgrimes#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 661541Srgrimes u_char ip_ttl; /* time to live */ 671541Srgrimes u_char ip_p; /* protocol */ 681541Srgrimes u_short ip_sum; /* checksum */ 691541Srgrimes struct in_addr ip_src,ip_dst; /* source and dest address */ 70165966Simp} __packed __aligned(4); 711541Srgrimes 721541Srgrimes#define IP_MAXPACKET 65535 /* maximum packet size */ 731541Srgrimes 741541Srgrimes/* 75169466Srwatson * Definitions for IP type of service (ip_tos). 761541Srgrimes */ 771541Srgrimes#define IPTOS_LOWDELAY 0x10 781541Srgrimes#define IPTOS_THROUGHPUT 0x08 791541Srgrimes#define IPTOS_RELIABILITY 0x04 808293Sache#define IPTOS_MINCOST 0x02 811541Srgrimes 821541Srgrimes/* 83169466Srwatson * Definitions for IP precedence (also in ip_tos) (hopefully unused). 841541Srgrimes */ 851541Srgrimes#define IPTOS_PREC_NETCONTROL 0xe0 861541Srgrimes#define IPTOS_PREC_INTERNETCONTROL 0xc0 871541Srgrimes#define IPTOS_PREC_CRITIC_ECP 0xa0 881541Srgrimes#define IPTOS_PREC_FLASHOVERRIDE 0x80 891541Srgrimes#define IPTOS_PREC_FLASH 0x60 901541Srgrimes#define IPTOS_PREC_IMMEDIATE 0x40 911541Srgrimes#define IPTOS_PREC_PRIORITY 0x20 928293Sache#define IPTOS_PREC_ROUTINE 0x00 931541Srgrimes 941541Srgrimes/* 95169466Srwatson * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the 96169466Srwatson * lower 2 bits of the TOS field. 97121684Sume */ 98121684Sume#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 99121684Sume#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 100121684Sume#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 101121684Sume#define IPTOS_ECN_CE 0x03 /* congestion experienced */ 102121684Sume#define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 103121684Sume 104121684Sume/* 1051541Srgrimes * Definitions for options. 1061541Srgrimes */ 1071541Srgrimes#define IPOPT_COPIED(o) ((o)&0x80) 1081541Srgrimes#define IPOPT_CLASS(o) ((o)&0x60) 1091541Srgrimes#define IPOPT_NUMBER(o) ((o)&0x1f) 1101541Srgrimes 1111541Srgrimes#define IPOPT_CONTROL 0x00 1121541Srgrimes#define IPOPT_RESERVED1 0x20 1131541Srgrimes#define IPOPT_DEBMEAS 0x40 1141541Srgrimes#define IPOPT_RESERVED2 0x60 1151541Srgrimes 1161541Srgrimes#define IPOPT_EOL 0 /* end of option list */ 1171541Srgrimes#define IPOPT_NOP 1 /* no operation */ 1181541Srgrimes 1191541Srgrimes#define IPOPT_RR 7 /* record packet route */ 1201541Srgrimes#define IPOPT_TS 68 /* timestamp */ 1211541Srgrimes#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 1221541Srgrimes#define IPOPT_LSRR 131 /* loose source route */ 12387919Srwatson#define IPOPT_ESO 133 /* extended security */ 12487917Srwatson#define IPOPT_CIPSO 134 /* commerical security */ 1251541Srgrimes#define IPOPT_SATID 136 /* satnet id */ 1261541Srgrimes#define IPOPT_SSRR 137 /* strict source route */ 12714622Sfenner#define IPOPT_RA 148 /* router alert */ 1281541Srgrimes 1291541Srgrimes/* 1301541Srgrimes * Offsets to fields in options other than EOL and NOP. 1311541Srgrimes */ 1321541Srgrimes#define IPOPT_OPTVAL 0 /* option ID */ 1331541Srgrimes#define IPOPT_OLEN 1 /* option length */ 134169466Srwatson#define IPOPT_OFFSET 2 /* offset within option */ 1351541Srgrimes#define IPOPT_MINOFF 4 /* min value of above */ 1361541Srgrimes 1371541Srgrimes/* 1381541Srgrimes * Time stamp option structure. 1391541Srgrimes */ 1401541Srgrimesstruct ip_timestamp { 1411541Srgrimes u_char ipt_code; /* IPOPT_TS */ 1421541Srgrimes u_char ipt_len; /* size of structure (variable) */ 1431541Srgrimes u_char ipt_ptr; /* index of current entry */ 1448876Srgrimes#if BYTE_ORDER == LITTLE_ENDIAN 145203343Sluigi u_char ipt_flg:4, /* flags, see below */ 1461541Srgrimes ipt_oflw:4; /* overflow counter */ 1471541Srgrimes#endif 1488876Srgrimes#if BYTE_ORDER == BIG_ENDIAN 149203343Sluigi u_char ipt_oflw:4, /* overflow counter */ 1501541Srgrimes ipt_flg:4; /* flags, see below */ 1511541Srgrimes#endif 1521541Srgrimes union ipt_timestamp { 153188578Sluigi uint32_t ipt_time[1]; /* network format */ 1541541Srgrimes struct ipt_ta { 1551541Srgrimes struct in_addr ipt_addr; 156188578Sluigi uint32_t ipt_time; /* network format */ 1571541Srgrimes } ipt_ta[1]; 1581541Srgrimes } ipt_timestamp; 1591541Srgrimes}; 1601541Srgrimes 161169466Srwatson/* Flag bits for ipt_flg. */ 1621541Srgrimes#define IPOPT_TS_TSONLY 0 /* timestamps only */ 1631541Srgrimes#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 1641541Srgrimes#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 1651541Srgrimes 166169466Srwatson/* Bits for security (not byte swapped). */ 1671541Srgrimes#define IPOPT_SECUR_UNCLASS 0x0000 1681541Srgrimes#define IPOPT_SECUR_CONFID 0xf135 1691541Srgrimes#define IPOPT_SECUR_EFTO 0x789a 1701541Srgrimes#define IPOPT_SECUR_MMMM 0xbc4d 1711541Srgrimes#define IPOPT_SECUR_RESTR 0xaf13 1721541Srgrimes#define IPOPT_SECUR_SECRET 0xd788 1731541Srgrimes#define IPOPT_SECUR_TOPSECRET 0x6bc5 1741541Srgrimes 1751541Srgrimes/* 1761541Srgrimes * Internet implementation parameters. 1771541Srgrimes */ 1781541Srgrimes#define MAXTTL 255 /* maximum time to live (seconds) */ 1791541Srgrimes#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 1801541Srgrimes#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 1811541Srgrimes#define IPTTLDEC 1 /* subtracted when forwarding */ 1821541Srgrimes#define IP_MSS 576 /* default maximum segment size */ 1832169Spaul 184125680Sbms/* 185125680Sbms * This is the real IPv4 pseudo header, used for computing the TCP and UDP 186125680Sbms * checksums. For the Internet checksum, struct ipovly can be used instead. 187125680Sbms * For stronger checksums, the real thing must be used. 188125680Sbms */ 189125680Sbmsstruct ippseudo { 190125680Sbms struct in_addr ippseudo_src; /* source internet address */ 191125680Sbms struct in_addr ippseudo_dst; /* destination internet address */ 192125870Sbms u_char ippseudo_pad; /* pad, must be zero */ 193125870Sbms u_char ippseudo_p; /* protocol */ 194125870Sbms u_short ippseudo_len; /* protocol length */ 195125870Sbms}; 1962169Spaul#endif 197