1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. 6 * 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 8.2 (Berkeley) 6/1/94 33 * $FreeBSD$ 34 */ 35 36 #ifndef _NETINET_IP_H_ 37 #define _NETINET_IP_H_ 38 39 #include <sys/cdefs.h> 40 41 /* 42 * Definitions for internet protocol version 4. 43 * 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_char ip_hl:4, /* header length */ 54 ip_v:4; /* version */ 55 #endif 56 #if BYTE_ORDER == BIG_ENDIAN 57 u_char ip_v:4, /* version */ 58 ip_hl:4; /* header length */ 59 #endif 60 u_char ip_tos; /* type of service */ 61 u_short ip_len; /* total length */ 62 u_short ip_id; /* identification */ 63 u_short 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_char ip_ttl; /* time to live */ 69 u_char ip_p; /* protocol */ 70 u_short ip_sum; /* checksum */ 71 struct in_addr ip_src,ip_dst; /* source and dest address */ 72 } __packed __aligned(2); 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 #define IPTOS_MINCOST 0x02 83 84 /* 85 * Definitions for IP precedence (also in ip_tos) (deprecated). 86 */ 87 #define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7 88 #define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6 89 #define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5 90 #define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4 91 #define IPTOS_PREC_FLASH IPTOS_DSCP_CS3 92 #define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2 93 #define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1 94 #define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0 95 96 /* 97 * Offset of Diffserv decimal value to convert it to tos value . 98 */ 99 #define IPTOS_DSCP_OFFSET 2 100 101 /* 102 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865. 103 */ 104 #define IPTOS_DSCP_CS0 0x00 105 #define IPTOS_DSCP_CS1 0x20 106 #define IPTOS_DSCP_AF11 0x28 107 #define IPTOS_DSCP_AF12 0x30 108 #define IPTOS_DSCP_AF13 0x38 109 #define IPTOS_DSCP_CS2 0x40 110 #define IPTOS_DSCP_AF21 0x48 111 #define IPTOS_DSCP_AF22 0x50 112 #define IPTOS_DSCP_AF23 0x58 113 #define IPTOS_DSCP_CS3 0x60 114 #define IPTOS_DSCP_AF31 0x68 115 #define IPTOS_DSCP_AF32 0x70 116 #define IPTOS_DSCP_AF33 0x78 117 #define IPTOS_DSCP_CS4 0x80 118 #define IPTOS_DSCP_AF41 0x88 119 #define IPTOS_DSCP_AF42 0x90 120 #define IPTOS_DSCP_AF43 0x98 121 #define IPTOS_DSCP_CS5 0xa0 122 #define IPTOS_DSCP_VA 0xb0 123 #define IPTOS_DSCP_EF 0xb8 124 #define IPTOS_DSCP_CS6 0xc0 125 #define IPTOS_DSCP_CS7 0xe0 126 127 /* 128 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the 129 * lower 2 bits of the TOS field. 130 */ 131 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 132 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 133 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 134 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 135 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 136 137 /* 138 * Definitions for options. 139 */ 140 #define IPOPT_COPIED(o) ((o)&0x80) 141 #define IPOPT_CLASS(o) ((o)&0x60) 142 #define IPOPT_NUMBER(o) ((o)&0x1f) 143 144 #define IPOPT_CONTROL 0x00 145 #define IPOPT_RESERVED1 0x20 146 #define IPOPT_DEBMEAS 0x40 147 #define IPOPT_RESERVED2 0x60 148 149 #define IPOPT_EOL 0 /* end of option list */ 150 #define IPOPT_NOP 1 /* no operation */ 151 152 #define IPOPT_RR 7 /* record packet route */ 153 #define IPOPT_TS 68 /* timestamp */ 154 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 155 #define IPOPT_LSRR 131 /* loose source route */ 156 #define IPOPT_ESO 133 /* extended security */ 157 #define IPOPT_CIPSO 134 /* commercial security */ 158 #define IPOPT_SATID 136 /* satnet id */ 159 #define IPOPT_SSRR 137 /* strict source route */ 160 #define IPOPT_RA 148 /* router alert */ 161 162 /* 163 * Offsets to fields in options other than EOL and NOP. 164 */ 165 #define IPOPT_OPTVAL 0 /* option ID */ 166 #define IPOPT_OLEN 1 /* option length */ 167 #define IPOPT_OFFSET 2 /* offset within option */ 168 #define IPOPT_MINOFF 4 /* min value of above */ 169 170 /* 171 * Time stamp option structure. 172 */ 173 struct ip_timestamp { 174 u_char ipt_code; /* IPOPT_TS */ 175 u_char ipt_len; /* size of structure (variable) */ 176 u_char ipt_ptr; /* index of current entry */ 177 #if BYTE_ORDER == LITTLE_ENDIAN 178 u_char ipt_flg:4, /* flags, see below */ 179 ipt_oflw:4; /* overflow counter */ 180 #endif 181 #if BYTE_ORDER == BIG_ENDIAN 182 u_char ipt_oflw:4, /* overflow counter */ 183 ipt_flg:4; /* flags, see below */ 184 #endif 185 union ipt_timestamp { 186 uint32_t ipt_time[1]; /* network format */ 187 struct ipt_ta { 188 struct in_addr ipt_addr; 189 uint32_t ipt_time; /* network format */ 190 } ipt_ta[1]; 191 } ipt_timestamp; 192 }; 193 194 /* Flag bits for ipt_flg. */ 195 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 196 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 197 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 198 199 /* Bits for security (not byte swapped). */ 200 #define IPOPT_SECUR_UNCLASS 0x0000 201 #define IPOPT_SECUR_CONFID 0xf135 202 #define IPOPT_SECUR_EFTO 0x789a 203 #define IPOPT_SECUR_MMMM 0xbc4d 204 #define IPOPT_SECUR_RESTR 0xaf13 205 #define IPOPT_SECUR_SECRET 0xd788 206 #define IPOPT_SECUR_TOPSECRET 0x6bc5 207 208 /* 209 * Internet implementation parameters. 210 */ 211 #define MAXTTL 255 /* maximum time to live (seconds) */ 212 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 213 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 214 #define IPTTLDEC 1 /* subtracted when forwarding */ 215 #define IP_MSS 576 /* default maximum segment size */ 216 217 /* 218 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 219 * checksums. For the Internet checksum, struct ipovly can be used instead. 220 * For stronger checksums, the real thing must be used. 221 */ 222 struct ippseudo { 223 struct in_addr ippseudo_src; /* source internet address */ 224 struct in_addr ippseudo_dst; /* destination internet address */ 225 u_char ippseudo_pad; /* pad, must be zero */ 226 u_char ippseudo_p; /* protocol */ 227 u_short ippseudo_len; /* protocol length */ 228 }; 229 #endif 230