1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ip.h 8.2 (Berkeley) 6/1/94 30 * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $ 31 */ 32 33 #ifndef _NETINET_IP_H_ 34 #define _NETINET_IP_H_ 35 36 #ifndef _SYS_TYPES_H_ 37 #include <sys/types.h> 38 #endif 39 #ifndef _NETINET_IN_H_ 40 #include <netinet/in.h> 41 #endif 42 #ifndef _NETINET_IN_SYSTM_H_ 43 #include <netinet/in_systm.h> 44 #endif 45 #include <machine/endian.h> 46 47 /* 48 * Definitions for internet protocol version 4. 49 * Per RFC 791, September 1981. 50 */ 51 #define IPVERSION 4 52 53 /* 54 * Structure of an internet header, naked of options. 55 */ 56 struct ip { 57 #ifdef _IP_VHL 58 u_char ip_vhl; /* version << 4 | header length >> 2 */ 59 #elif _BYTE_ORDER == _LITTLE_ENDIAN 60 u_int ip_hl:4, /* header length */ 61 ip_v:4; /* version */ 62 #elif _BYTE_ORDER == _BIG_ENDIAN 63 u_int ip_v:4, /* version */ 64 ip_hl:4; /* header length */ 65 #else 66 #error "Byte order not implemented" 67 #endif 68 u_char ip_tos; /* type of service */ 69 u_short ip_len; /* total length */ 70 u_short ip_id; /* identification */ 71 u_short ip_off; /* fragment offset field */ 72 #define IP_RF 0x8000 /* reserved fragment flag */ 73 #define IP_DF 0x4000 /* dont fragment flag */ 74 #define IP_MF 0x2000 /* more fragments flag */ 75 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 76 u_char ip_ttl; /* time to live */ 77 u_char ip_p; /* protocol */ 78 u_short ip_sum; /* checksum */ 79 struct in_addr ip_src,ip_dst; /* source and dest address */ 80 }; 81 82 #ifdef _IP_VHL 83 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) 84 #define IP_VHL_HL(vhl) ((vhl) & 0x0f) 85 #define IP_VHL_V(vhl) ((vhl) >> 4) 86 #define IP_VHL_BORING 0x45 87 #endif 88 89 #define IP_MAXPACKET 65535 /* maximum packet size */ 90 91 /* 92 * Definitions for IP type of service (ip_tos). 93 */ 94 #define IPTOS_LOWDELAY 0x10 95 #define IPTOS_THROUGHPUT 0x08 96 #define IPTOS_RELIABILITY 0x04 97 #define IPTOS_MINCOST 0x02 98 #if 1 99 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 100 #define IPTOS_CE 0x01 /* congestion experienced */ 101 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 102 #endif 103 104 /* 105 * Definitions for IP precedence (also in ip_tos) (deprecated). 106 */ 107 #define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7 108 #define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6 109 #define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5 110 #define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4 111 #define IPTOS_PREC_FLASH IPTOS_DSCP_CS3 112 #define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2 113 #define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1 114 #define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0 115 116 /* 117 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865. 118 */ 119 #define IPTOS_DSCP_CS0 0x00 120 #define IPTOS_DSCP_CS1 0x20 121 #define IPTOS_DSCP_AF11 0x28 122 #define IPTOS_DSCP_AF12 0x30 123 #define IPTOS_DSCP_AF13 0x38 124 #define IPTOS_DSCP_CS2 0x40 125 #define IPTOS_DSCP_AF21 0x48 126 #define IPTOS_DSCP_AF22 0x50 127 #define IPTOS_DSCP_AF23 0x58 128 #define IPTOS_DSCP_CS3 0x60 129 #define IPTOS_DSCP_AF31 0x68 130 #define IPTOS_DSCP_AF32 0x70 131 #define IPTOS_DSCP_AF33 0x78 132 #define IPTOS_DSCP_CS4 0x80 133 #define IPTOS_DSCP_AF41 0x88 134 #define IPTOS_DSCP_AF42 0x90 135 #define IPTOS_DSCP_AF43 0x98 136 #define IPTOS_DSCP_CS5 0xa0 137 #define IPTOS_DSCP_VA 0xb0 138 #define IPTOS_DSCP_EF 0xb8 139 #define IPTOS_DSCP_CS6 0xc0 140 #define IPTOS_DSCP_CS7 0xe0 141 142 /* 143 * ECN (Explicit Congestion Notification) codepoints in RFC3168 144 * mapped to the lower 2 bits of the TOS field. 145 */ 146 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 147 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 148 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 149 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 150 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 151 152 /* 153 * Definitions for options. 154 */ 155 #define IPOPT_COPIED(o) ((o)&0x80) 156 #define IPOPT_CLASS(o) ((o)&0x60) 157 #define IPOPT_NUMBER(o) ((o)&0x1f) 158 159 #define IPOPT_CONTROL 0x00 160 #define IPOPT_RESERVED1 0x20 161 #define IPOPT_DEBMEAS 0x40 162 #define IPOPT_RESERVED2 0x60 163 164 #define IPOPT_EOL 0 /* end of option list */ 165 #define IPOPT_NOP 1 /* no operation */ 166 167 #define IPOPT_RR 7 /* record packet route */ 168 #define IPOPT_TS 68 /* timestamp */ 169 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 170 #define IPOPT_LSRR 131 /* loose source route */ 171 #define IPOPT_SATID 136 /* satnet id */ 172 #define IPOPT_SSRR 137 /* strict source route */ 173 #define IPOPT_RA 148 /* router alert */ 174 175 /* 176 * Offsets to fields in options other than EOL and NOP. 177 */ 178 #define IPOPT_OPTVAL 0 /* option ID */ 179 #define IPOPT_OLEN 1 /* option length */ 180 #define IPOPT_OFFSET 2 /* offset within option */ 181 #define IPOPT_MINOFF 4 /* min value of above */ 182 183 /* 184 * Time stamp option structure. 185 */ 186 struct ip_timestamp { 187 u_char ipt_code; /* IPOPT_TS */ 188 u_char ipt_len; /* size of structure (variable) */ 189 u_char ipt_ptr; /* index of current entry */ 190 #if _BYTE_ORDER == _LITTLE_ENDIAN 191 u_int ipt_flg:4, /* flags, see below */ 192 ipt_oflw:4; /* overflow counter */ 193 #elif _BYTE_ORDER == _BIG_ENDIAN 194 u_int ipt_oflw:4, /* overflow counter */ 195 ipt_flg:4; /* flags, see below */ 196 #else 197 #error "Byte order not implemented" 198 #endif 199 union ipt_timestamp { 200 n_long ipt_time[1]; 201 struct ipt_ta { 202 struct in_addr ipt_addr; 203 n_long ipt_time; 204 } ipt_ta[1]; 205 } ipt_timestamp; 206 }; 207 208 /* Flag bits for ipt_flg. */ 209 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 210 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 211 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 212 213 /* Bits for security (not byte swapped). */ 214 #define IPOPT_SECUR_UNCLASS 0x0000 215 #define IPOPT_SECUR_CONFID 0xf135 216 #define IPOPT_SECUR_EFTO 0x789a 217 #define IPOPT_SECUR_MMMM 0xbc4d 218 #define IPOPT_SECUR_RESTR 0xaf13 219 #define IPOPT_SECUR_SECRET 0xd788 220 #define IPOPT_SECUR_TOPSECRET 0x6bc5 221 222 /* 223 * Internet implementation parameters. 224 */ 225 #define MAXTTL 255 /* maximum time to live (seconds) */ 226 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 227 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 228 #define IPTTLDEC 1 /* subtracted when forwarding */ 229 #define IP_MSS 576 /* default maximum segment size */ 230 231 /* 232 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 233 * checksums. For the Internet checksum, struct ipovly can be used instead. 234 * For stronger checksums, the real thing must be used. 235 */ 236 struct ippseudo { 237 struct in_addr ippseudo_src; /* source internet address */ 238 struct in_addr ippseudo_dst; /* destination internet address */ 239 u_int8_t ippseudo_pad; /* pad, must be zero */ 240 u_int8_t ippseudo_p; /* protocol */ 241 u_int16_t ippseudo_len; /* protocol length */ 242 } __packed; 243 #endif 244