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 /* 106 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 107 */ 108 #define IPTOS_PREC_NETCONTROL 0xe0 109 #define IPTOS_PREC_INTERNETCONTROL 0xc0 110 #define IPTOS_PREC_CRITIC_ECP 0xa0 111 #define IPTOS_PREC_FLASHOVERRIDE 0x80 112 #define IPTOS_PREC_FLASH 0x60 113 #define IPTOS_PREC_IMMEDIATE 0x40 114 #define IPTOS_PREC_PRIORITY 0x20 115 #define IPTOS_PREC_ROUTINE 0x00 116 117 /* 118 * ECN (Explicit Congestion Notification) codepoints in RFC3168 119 * mapped to the lower 2 bits of the TOS field. 120 */ 121 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 122 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 123 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 124 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 125 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 126 127 /* 128 * Definitions for options. 129 */ 130 #define IPOPT_COPIED(o) ((o)&0x80) 131 #define IPOPT_CLASS(o) ((o)&0x60) 132 #define IPOPT_NUMBER(o) ((o)&0x1f) 133 134 #define IPOPT_CONTROL 0x00 135 #define IPOPT_RESERVED1 0x20 136 #define IPOPT_DEBMEAS 0x40 137 #define IPOPT_RESERVED2 0x60 138 139 #define IPOPT_EOL 0 /* end of option list */ 140 #define IPOPT_NOP 1 /* no operation */ 141 142 #define IPOPT_RR 7 /* record packet route */ 143 #define IPOPT_TS 68 /* timestamp */ 144 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 145 #define IPOPT_LSRR 131 /* loose source route */ 146 #define IPOPT_SATID 136 /* satnet id */ 147 #define IPOPT_SSRR 137 /* strict source route */ 148 #define IPOPT_RA 148 /* router alert */ 149 150 /* 151 * Offsets to fields in options other than EOL and NOP. 152 */ 153 #define IPOPT_OPTVAL 0 /* option ID */ 154 #define IPOPT_OLEN 1 /* option length */ 155 #define IPOPT_OFFSET 2 /* offset within option */ 156 #define IPOPT_MINOFF 4 /* min value of above */ 157 158 /* 159 * Time stamp option structure. 160 */ 161 struct ip_timestamp { 162 u_char ipt_code; /* IPOPT_TS */ 163 u_char ipt_len; /* size of structure (variable) */ 164 u_char ipt_ptr; /* index of current entry */ 165 #if _BYTE_ORDER == _LITTLE_ENDIAN 166 u_int ipt_flg:4, /* flags, see below */ 167 ipt_oflw:4; /* overflow counter */ 168 #elif _BYTE_ORDER == _BIG_ENDIAN 169 u_int ipt_oflw:4, /* overflow counter */ 170 ipt_flg:4; /* flags, see below */ 171 #else 172 #error "Byte order not implemented" 173 #endif 174 union ipt_timestamp { 175 n_long ipt_time[1]; 176 struct ipt_ta { 177 struct in_addr ipt_addr; 178 n_long ipt_time; 179 } ipt_ta[1]; 180 } ipt_timestamp; 181 }; 182 183 /* flag bits for ipt_flg */ 184 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 185 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 186 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 187 188 /* bits for security (not byte swapped) */ 189 #define IPOPT_SECUR_UNCLASS 0x0000 190 #define IPOPT_SECUR_CONFID 0xf135 191 #define IPOPT_SECUR_EFTO 0x789a 192 #define IPOPT_SECUR_MMMM 0xbc4d 193 #define IPOPT_SECUR_RESTR 0xaf13 194 #define IPOPT_SECUR_SECRET 0xd788 195 #define IPOPT_SECUR_TOPSECRET 0x6bc5 196 197 /* 198 * Internet implementation parameters. 199 */ 200 #define MAXTTL 255 /* maximum time to live (seconds) */ 201 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 202 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 203 #define IPTTLDEC 1 /* subtracted when forwarding */ 204 205 #define IP_MSS 576 /* default maximum segment size */ 206 207 /* 208 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 209 * checksums. For the Internet checksum, struct ipovly can be used instead. 210 * For stronger checksums, the real thing must be used. 211 */ 212 struct ippseudo { 213 struct in_addr ippseudo_src; /* source internet address */ 214 struct in_addr ippseudo_dst; /* destination internet address */ 215 u_int8_t ippseudo_pad; /* pad, must be zero */ 216 u_int8_t ippseudo_p; /* protocol */ 217 u_int16_t ippseudo_len; /* protocol length */ 218 } __packed; 219 #endif 220