| 1 | /* $NetBSD: ip.h,v 1.34 2012/11/02 21:07:07 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1982, 1986, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the University nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * @(#)ip.h 8.2 (Berkeley) 6/1/94 |
| 32 | */ |
| 33 | |
| 34 | #ifndef _NETINET_IP_H_ |
| 35 | #define _NETINET_IP_H_ |
| 36 | |
| 37 | #include <netinet/in_systm.h> /* for n_time */ |
| 38 | /* |
| 39 | * Definitions for internet protocol version 4. |
| 40 | * Per RFC 791, September 1981. |
| 41 | */ |
| 42 | #define IPVERSION 4 |
| 43 | |
| 44 | /* |
| 45 | * Structure of an internet header, naked of options. |
| 46 | */ |
| 47 | struct ip { |
| 48 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 49 | unsigned int ip_hl:4, /* header length */ |
| 50 | ip_v:4; /* version */ |
| 51 | #endif |
| 52 | #if BYTE_ORDER == BIG_ENDIAN |
| 53 | unsigned int ip_v:4, /* version */ |
| 54 | ip_hl:4; /* header length */ |
| 55 | #endif |
| 56 | u_int8_t ip_tos; /* type of service */ |
| 57 | u_int16_t ip_len; /* total length */ |
| 58 | u_int16_t ip_id; /* identification */ |
| 59 | u_int16_t ip_off; /* fragment offset field */ |
| 60 | #define IP_RF 0x8000 /* reserved fragment flag */ |
| 61 | #define IP_EF 0x8000 /* evil flag, per RFC 3514 */ |
| 62 | #define IP_DF 0x4000 /* dont fragment flag */ |
| 63 | #define IP_MF 0x2000 /* more fragments flag */ |
| 64 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ |
| 65 | u_int8_t ip_ttl; /* time to live */ |
| 66 | u_int8_t ip_p; /* protocol */ |
| 67 | u_int16_t ip_sum; /* checksum */ |
| 68 | struct in_addr ip_src, ip_dst; /* source and dest address */ |
| 69 | } __packed; |
| 70 | |
| 71 | #define IP_MAXPACKET 65535 /* maximum packet size */ |
| 72 | #define IP_MINFRAGSIZE 69 /* minumum size that can be fraged */ |
| 73 | |
| 74 | /* |
| 75 | * Definitions for IP type of service (ip_tos) |
| 76 | */ |
| 77 | |
| 78 | /* |
| 79 | * Definitions for DiffServ Codepoints as per RFC2474 |
| 80 | */ |
| 81 | #define IPTOS_DSCP_CS0 0x00 |
| 82 | #define IPTOS_DSCP_CS1 0x20 |
| 83 | #define IPTOS_DSCP_AF11 0x28 |
| 84 | #define IPTOS_DSCP_AF12 0x30 |
| 85 | #define IPTOS_DSCP_AF13 0x38 |
| 86 | #define IPTOS_DSCP_CS2 0x40 |
| 87 | #define IPTOS_DSCP_AF21 0x48 |
| 88 | #define IPTOS_DSCP_AF22 0x50 |
| 89 | #define IPTOS_DSCP_AF23 0x58 |
| 90 | #define IPTOS_DSCP_CS3 0x60 |
| 91 | #define IPTOS_DSCP_AF31 0x68 |
| 92 | #define IPTOS_DSCP_AF32 0x70 |
| 93 | #define IPTOS_DSCP_AF33 0x78 |
| 94 | #define IPTOS_DSCP_CS4 0x80 |
| 95 | #define IPTOS_DSCP_AF41 0x88 |
| 96 | #define IPTOS_DSCP_AF42 0x90 |
| 97 | #define IPTOS_DSCP_AF43 0x98 |
| 98 | #define IPTOS_DSCP_CS5 0xa0 |
| 99 | #define IPTOS_DSCP_EF 0xb8 |
| 100 | #define IPTOS_DSCP_CS6 0xc0 |
| 101 | #define IPTOS_DSCP_CS7 0xe0 |
| 102 | |
| 103 | /* |
| 104 | * Definitions for DiffServ Class Selector Codepoints |
| 105 | */ |
| 106 | #define IPTOS_CLASS_CS0 0x00 |
| 107 | #define IPTOS_CLASS_CS1 0x20 |
| 108 | #define IPTOS_CLASS_CS2 0x40 |
| 109 | #define IPTOS_CLASS_CS3 0x60 |
| 110 | #define IPTOS_CLASS_CS4 0x80 |
| 111 | #define IPTOS_CLASS_CS5 0xa0 |
| 112 | #define IPTOS_CLASS_CS6 0xc0 |
| 113 | #define IPTOS_CLASS_CS7 0xe0 |
| 114 | #define IPTOS_CLASS_DEFAULT IPTOS_CLASS_CS0 |
| 115 | #define IPTOS_CLASS_MASK 0xe0 |
| 116 | #define IPTOS_CLASS(cs) ((cs) & IPTOS_CLASS_MASK) |
| 117 | #define IPTOS_DSCP_MASK 0xfc |
| 118 | #define IPTOS_DSCP(cp) ((cp) & IPTOS_DSCP_MASK) |
| 119 | |
| 120 | /* |
| 121 | * ECN (Explicit Congestion Notification) codepoints in RFC3168 |
| 122 | * mapped to the lower 2 bits of the TOS field. |
| 123 | */ |
| 124 | #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ |
| 125 | #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ |
| 126 | #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ |
| 127 | #define IPTOS_ECN_CE 0x03 /* congestion experienced */ |
| 128 | #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ |
| 129 | #define IPTOS_ECN(cn) ((cn) & IPTOS_ECN_MASK) |
| 130 | #define IPTOS_ECN_NOT_ECT 0x00 |
| 131 | |
| 132 | /* |
| 133 | * Definitions for IP type of service per RFC1349 (ip_tos) |
| 134 | * DEPRECATED |
| 135 | */ |
| 136 | #define IPTOS_LOWDELAY 0x10 |
| 137 | #define IPTOS_THROUGHPUT 0x08 |
| 138 | #define IPTOS_RELIABILITY 0x04 |
| 139 | #define IPTOS_MINCOST 0x02 |
| 140 | /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ |
| 141 | #define IPTOS_CE 0x01 /* congestion experienced */ |
| 142 | #define IPTOS_ECT 0x02 /* ECN-capable transport */ |
| 143 | |
| 144 | /* |
| 145 | * Definitions for IP precedence per RFC1195 (also in ip_tos) (hopefully unused) |
| 146 | */ |
| 147 | #define IPTOS_PREC_NETCONTROL 0xe0 |
| 148 | #define IPTOS_PREC_INTERNETCONTROL 0xc0 |
| 149 | #define IPTOS_PREC_CRITIC_ECP 0xa0 |
| 150 | #define IPTOS_PREC_FLASHOVERRIDE 0x80 |
| 151 | #define IPTOS_PREC_FLASH 0x60 |
| 152 | #define IPTOS_PREC_IMMEDIATE 0x40 |
| 153 | #define IPTOS_PREC_PRIORITY 0x20 |
| 154 | #define IPTOS_PREC_ROUTINE 0x00 |
| 155 | |
| 156 | /* |
| 157 | * Definitions for options. |
| 158 | */ |
| 159 | #define IPOPT_COPIED(o) ((o)&0x80) |
| 160 | #define IPOPT_CLASS(o) ((o)&0x60) |
| 161 | #define IPOPT_NUMBER(o) ((o)&0x1f) |
| 162 | |
| 163 | #define IPOPT_CONTROL 0x00 |
| 164 | #define IPOPT_RESERVED1 0x20 |
| 165 | #define IPOPT_DEBMEAS 0x40 |
| 166 | #define IPOPT_RESERVED2 0x60 |
| 167 | |
| 168 | #define IPOPT_EOL 0 /* end of option list */ |
| 169 | #define IPOPT_NOP 1 /* no operation */ |
| 170 | |
| 171 | #define IPOPT_RR 7 /* record packet route */ |
| 172 | #define IPOPT_TS 68 /* timestamp */ |
| 173 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
| 174 | #define IPOPT_LSRR 131 /* loose source route */ |
| 175 | #define IPOPT_SATID 136 /* satnet id */ |
| 176 | #define IPOPT_SSRR 137 /* strict source route */ |
| 177 | |
| 178 | /* |
| 179 | * Offsets to fields in options other than EOL and NOP. |
| 180 | */ |
| 181 | #define IPOPT_OPTVAL 0 /* option ID */ |
| 182 | #define IPOPT_OLEN 1 /* option length */ |
| 183 | #define IPOPT_OFFSET 2 /* offset within option */ |
| 184 | #define IPOPT_MINOFF 4 /* min value of above */ |
| 185 | |
| 186 | /* |
| 187 | * Time stamp option structure. |
| 188 | */ |
| 189 | struct ip_timestamp { |
| 190 | u_int8_t ipt_code; /* IPOPT_TS */ |
| 191 | u_int8_t ipt_len; /* size of structure (variable) */ |
| 192 | u_int8_t ipt_ptr; /* index of current entry */ |
| 193 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 194 | unsigned int ipt_flg:4, /* flags, see below */ |
| 195 | ipt_oflw:4; /* overflow counter */ |
| 196 | #endif |
| 197 | #if BYTE_ORDER == BIG_ENDIAN |
| 198 | unsigned int ipt_oflw:4, /* overflow counter */ |
| 199 | ipt_flg:4; /* flags, see below */ |
| 200 | #endif |
| 201 | union ipt_timestamp { |
| 202 | n_time ipt_time[1]; |
| 203 | struct ipt_ta { |
| 204 | struct in_addr ipt_addr; |
| 205 | n_time ipt_time; |
| 206 | } ipt_ta[1] __packed; |
| 207 | } ipt_timestamp __packed; |
| 208 | } __packed; |
| 209 | |
| 210 | /* flag bits for ipt_flg */ |
| 211 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ |
| 212 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ |
| 213 | #define IPOPT_TS_PRESPEC 3 /* specified modules only */ |
| 214 | |
| 215 | /* bits for security (not byte swapped) */ |
| 216 | #define IPOPT_SECUR_UNCLASS 0x0000 |
| 217 | #define IPOPT_SECUR_CONFID 0xf135 |
| 218 | #define IPOPT_SECUR_EFTO 0x789a |
| 219 | #define IPOPT_SECUR_MMMM 0xbc4d |
| 220 | #define IPOPT_SECUR_RESTR 0xaf13 |
| 221 | #define IPOPT_SECUR_SECRET 0xd788 |
| 222 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 |
| 223 | |
| 224 | /* |
| 225 | * Internet implementation parameters. |
| 226 | */ |
| 227 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
| 228 | #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ |
| 229 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */ |
| 230 | #define IPTTLDEC 1 /* subtracted when forwarding */ |
| 231 | |
| 232 | #define IP_MSS 576 /* default maximum segment size */ |
| 233 | |
| 234 | /* |
| 235 | * This is the real IPv4 pseudo header, used for computing the TCP and UDP |
| 236 | * checksums. For the Internet checksum, struct ipovly can be used instead. |
| 237 | * For stronger checksums, the real thing must be used. |
| 238 | */ |
| 239 | struct ippseudo { |
| 240 | struct in_addr ippseudo_src; /* source internet address */ |
| 241 | struct in_addr ippseudo_dst; /* destination internet address */ |
| 242 | u_int8_t ippseudo_pad; /* pad, must be zero */ |
| 243 | u_int8_t ippseudo_p; /* protocol */ |
| 244 | u_int16_t ippseudo_len; /* protocol length */ |
| 245 | } __packed; |
| 246 | #endif /* !_NETINET_IP_H_ */ |
| 247 | |