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 33 #ifndef _NETINET_IP_H_ 34 #define _NETINET_IP_H_ 35 36 #include <sys/types.h> 37 #include <netinet/in.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 */ 49 struct 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; 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 IPTOS_DSCP_CS0 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 * Offset of Diffserv decimal value to convert it to tos value . 96 */ 97 #define IPTOS_DSCP_OFFSET 2 98 99 /* 100 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865. 101 */ 102 #define IPTOS_DSCP_CS0 0x00 103 #define IPTOS_DSCP_CS1 0x20 104 #define IPTOS_DSCP_AF11 0x28 105 #define IPTOS_DSCP_AF12 0x30 106 #define IPTOS_DSCP_AF13 0x38 107 #define IPTOS_DSCP_CS2 0x40 108 #define IPTOS_DSCP_AF21 0x48 109 #define IPTOS_DSCP_AF22 0x50 110 #define IPTOS_DSCP_AF23 0x58 111 #define IPTOS_DSCP_CS3 0x60 112 #define IPTOS_DSCP_AF31 0x68 113 #define IPTOS_DSCP_AF32 0x70 114 #define IPTOS_DSCP_AF33 0x78 115 #define IPTOS_DSCP_CS4 0x80 116 #define IPTOS_DSCP_AF41 0x88 117 #define IPTOS_DSCP_AF42 0x90 118 #define IPTOS_DSCP_AF43 0x98 119 #define IPTOS_DSCP_CS5 0xa0 120 #define IPTOS_DSCP_VA 0xb0 121 #define IPTOS_DSCP_EF 0xb8 122 #define IPTOS_DSCP_CS6 0xc0 123 #define IPTOS_DSCP_CS7 0xe0 124 125 /* 126 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the 127 * lower 2 bits of the TOS field. 128 */ 129 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 130 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 131 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 132 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 133 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 134 135 /* 136 * Definitions for options. 137 */ 138 #define IPOPT_COPIED(o) ((o)&0x80) 139 #define IPOPT_CLASS(o) ((o)&0x60) 140 #define IPOPT_NUMBER(o) ((o)&0x1f) 141 142 #define IPOPT_CONTROL 0x00 143 #define IPOPT_RESERVED1 0x20 144 #define IPOPT_DEBMEAS 0x40 145 #define IPOPT_RESERVED2 0x60 146 147 #define IPOPT_EOL 0 /* end of option list */ 148 #define IPOPT_NOP 1 /* no operation */ 149 150 #define IPOPT_RR 7 /* record packet route */ 151 #define IPOPT_TS 68 /* timestamp */ 152 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 153 #define IPOPT_LSRR 131 /* loose source route */ 154 #define IPOPT_ESO 133 /* extended security */ 155 #define IPOPT_CIPSO 134 /* commercial security */ 156 #define IPOPT_SATID 136 /* satnet id */ 157 #define IPOPT_SSRR 137 /* strict source route */ 158 #define IPOPT_RA 148 /* router alert */ 159 160 /* 161 * Offsets to fields in options other than EOL and NOP. 162 */ 163 #define IPOPT_OPTVAL 0 /* option ID */ 164 #define IPOPT_OLEN 1 /* option length */ 165 #define IPOPT_OFFSET 2 /* offset within option */ 166 #define IPOPT_MINOFF 4 /* min value of above */ 167 168 /* 169 * Time stamp option structure. 170 */ 171 struct ip_timestamp { 172 u_char ipt_code; /* IPOPT_TS */ 173 u_char ipt_len; /* size of structure (variable) */ 174 u_char ipt_ptr; /* index of current entry */ 175 #if BYTE_ORDER == LITTLE_ENDIAN 176 u_char ipt_flg:4, /* flags, see below */ 177 ipt_oflw:4; /* overflow counter */ 178 #endif 179 #if BYTE_ORDER == BIG_ENDIAN 180 u_char ipt_oflw:4, /* overflow counter */ 181 ipt_flg:4; /* flags, see below */ 182 #endif 183 union ipt_timestamp { 184 uint32_t ipt_time[1]; /* network format */ 185 struct ipt_ta { 186 struct in_addr ipt_addr; 187 uint32_t ipt_time; /* network format */ 188 } ipt_ta[1]; 189 } ipt_timestamp; 190 } __packed; 191 192 /* Flag bits for ipt_flg. */ 193 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 194 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 195 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 196 197 /* Bits for security (not byte swapped). */ 198 #define IPOPT_SECUR_UNCLASS 0x0000 199 #define IPOPT_SECUR_CONFID 0xf135 200 #define IPOPT_SECUR_EFTO 0x789a 201 #define IPOPT_SECUR_MMMM 0xbc4d 202 #define IPOPT_SECUR_RESTR 0xaf13 203 #define IPOPT_SECUR_SECRET 0xd788 204 #define IPOPT_SECUR_TOPSECRET 0x6bc5 205 206 /* 207 * Internet implementation parameters. 208 */ 209 #define MAXTTL 255 /* maximum time to live (seconds) */ 210 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 211 #define IPTTLDEC 1 /* subtracted when forwarding */ 212 #define IP_MSS 576 /* default maximum segment size */ 213 214 /* 215 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 216 * checksums. For the Internet checksum, struct ipovly can be used instead. 217 * For stronger checksums, the real thing must be used. 218 */ 219 struct ippseudo { 220 struct in_addr ippseudo_src; /* source internet address */ 221 struct in_addr ippseudo_dst; /* destination internet address */ 222 u_char ippseudo_pad; /* pad, must be zero */ 223 u_char ippseudo_p; /* protocol */ 224 u_short ippseudo_len; /* protocol length */ 225 }; 226 #endif 227