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 */ 34 35 #ifndef _NETINET_IP_H_ 36 #define _NETINET_IP_H_ 37 38 #include <sys/cdefs.h> 39 40 /* 41 * Definitions for internet protocol version 4. 42 * 43 * Per RFC 791, September 1981. 44 */ 45 #define IPVERSION 4 46 47 /* 48 * Structure of an internet header, naked of options. 49 */ 50 struct ip { 51 #if BYTE_ORDER == LITTLE_ENDIAN 52 u_char ip_hl:4, /* header length */ 53 ip_v:4; /* version */ 54 #endif 55 #if BYTE_ORDER == BIG_ENDIAN 56 u_char ip_v:4, /* version */ 57 ip_hl:4; /* header length */ 58 #endif 59 u_char ip_tos; /* type of service */ 60 u_short ip_len; /* total length */ 61 u_short ip_id; /* identification */ 62 u_short ip_off; /* fragment offset field */ 63 #define IP_RF 0x8000 /* reserved fragment flag */ 64 #define IP_DF 0x4000 /* dont fragment flag */ 65 #define IP_MF 0x2000 /* more fragments flag */ 66 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 67 u_char ip_ttl; /* time to live */ 68 u_char ip_p; /* protocol */ 69 u_short ip_sum; /* checksum */ 70 struct in_addr ip_src,ip_dst; /* source and dest address */ 71 } __packed __aligned(2); 72 73 #define IP_MAXPACKET 65535 /* maximum packet size */ 74 75 /* 76 * Definitions for IP type of service (ip_tos). 77 */ 78 #define IPTOS_LOWDELAY 0x10 79 #define IPTOS_THROUGHPUT 0x08 80 #define IPTOS_RELIABILITY 0x04 81 #define IPTOS_MINCOST IPTOS_DSCP_CS0 82 83 /* 84 * Definitions for IP precedence (also in ip_tos) (deprecated). 85 */ 86 #define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7 87 #define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6 88 #define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5 89 #define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4 90 #define IPTOS_PREC_FLASH IPTOS_DSCP_CS3 91 #define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2 92 #define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1 93 #define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0 94 95 /* 96 * Offset of Diffserv decimal value to convert it to tos value . 97 */ 98 #define IPTOS_DSCP_OFFSET 2 99 100 /* 101 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865. 102 */ 103 #define IPTOS_DSCP_CS0 0x00 104 #define IPTOS_DSCP_CS1 0x20 105 #define IPTOS_DSCP_AF11 0x28 106 #define IPTOS_DSCP_AF12 0x30 107 #define IPTOS_DSCP_AF13 0x38 108 #define IPTOS_DSCP_CS2 0x40 109 #define IPTOS_DSCP_AF21 0x48 110 #define IPTOS_DSCP_AF22 0x50 111 #define IPTOS_DSCP_AF23 0x58 112 #define IPTOS_DSCP_CS3 0x60 113 #define IPTOS_DSCP_AF31 0x68 114 #define IPTOS_DSCP_AF32 0x70 115 #define IPTOS_DSCP_AF33 0x78 116 #define IPTOS_DSCP_CS4 0x80 117 #define IPTOS_DSCP_AF41 0x88 118 #define IPTOS_DSCP_AF42 0x90 119 #define IPTOS_DSCP_AF43 0x98 120 #define IPTOS_DSCP_CS5 0xa0 121 #define IPTOS_DSCP_VA 0xb0 122 #define IPTOS_DSCP_EF 0xb8 123 #define IPTOS_DSCP_CS6 0xc0 124 #define IPTOS_DSCP_CS7 0xe0 125 126 /* 127 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the 128 * lower 2 bits of the TOS field. 129 */ 130 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 131 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 132 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 133 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 134 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 135 136 /* 137 * Definitions for options. 138 */ 139 #define IPOPT_COPIED(o) ((o)&0x80) 140 #define IPOPT_CLASS(o) ((o)&0x60) 141 #define IPOPT_NUMBER(o) ((o)&0x1f) 142 143 #define IPOPT_CONTROL 0x00 144 #define IPOPT_RESERVED1 0x20 145 #define IPOPT_DEBMEAS 0x40 146 #define IPOPT_RESERVED2 0x60 147 148 #define IPOPT_EOL 0 /* end of option list */ 149 #define IPOPT_NOP 1 /* no operation */ 150 151 #define IPOPT_RR 7 /* record packet route */ 152 #define IPOPT_TS 68 /* timestamp */ 153 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 154 #define IPOPT_LSRR 131 /* loose source route */ 155 #define IPOPT_ESO 133 /* extended security */ 156 #define IPOPT_CIPSO 134 /* commercial security */ 157 #define IPOPT_SATID 136 /* satnet id */ 158 #define IPOPT_SSRR 137 /* strict source route */ 159 #define IPOPT_RA 148 /* router alert */ 160 161 /* 162 * Offsets to fields in options other than EOL and NOP. 163 */ 164 #define IPOPT_OPTVAL 0 /* option ID */ 165 #define IPOPT_OLEN 1 /* option length */ 166 #define IPOPT_OFFSET 2 /* offset within option */ 167 #define IPOPT_MINOFF 4 /* min value of above */ 168 169 /* 170 * Time stamp option structure. 171 */ 172 struct ip_timestamp { 173 u_char ipt_code; /* IPOPT_TS */ 174 u_char ipt_len; /* size of structure (variable) */ 175 u_char ipt_ptr; /* index of current entry */ 176 #if BYTE_ORDER == LITTLE_ENDIAN 177 u_char ipt_flg:4, /* flags, see below */ 178 ipt_oflw:4; /* overflow counter */ 179 #endif 180 #if BYTE_ORDER == BIG_ENDIAN 181 u_char ipt_oflw:4, /* overflow counter */ 182 ipt_flg:4; /* flags, see below */ 183 #endif 184 union ipt_timestamp { 185 uint32_t ipt_time[1]; /* network format */ 186 struct ipt_ta { 187 struct in_addr ipt_addr; 188 uint32_t ipt_time; /* network format */ 189 } ipt_ta[1]; 190 } ipt_timestamp; 191 }; 192 193 /* Flag bits for ipt_flg. */ 194 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 195 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 196 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 197 198 /* Bits for security (not byte swapped). */ 199 #define IPOPT_SECUR_UNCLASS 0x0000 200 #define IPOPT_SECUR_CONFID 0xf135 201 #define IPOPT_SECUR_EFTO 0x789a 202 #define IPOPT_SECUR_MMMM 0xbc4d 203 #define IPOPT_SECUR_RESTR 0xaf13 204 #define IPOPT_SECUR_SECRET 0xd788 205 #define IPOPT_SECUR_TOPSECRET 0x6bc5 206 207 /* 208 * Internet implementation parameters. 209 */ 210 #define MAXTTL 255 /* maximum time to live (seconds) */ 211 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 212 #define IPTTLDEC 1 /* subtracted when forwarding */ 213 #define IP_MSS 576 /* default maximum segment size */ 214 215 /* 216 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 217 * checksums. For the Internet checksum, struct ipovly can be used instead. 218 * For stronger checksums, the real thing must be used. 219 */ 220 struct ippseudo { 221 struct in_addr ippseudo_src; /* source internet address */ 222 struct in_addr ippseudo_dst; /* destination internet address */ 223 u_char ippseudo_pad; /* pad, must be zero */ 224 u_char ippseudo_p; /* protocol */ 225 u_short ippseudo_len; /* protocol length */ 226 }; 227 #endif 228