1 /* $OpenBSD: ip.h,v 1.12 2006/04/27 02:19:32 tedu Exp $ */ 2 /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. 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 8.1 (Berkeley) 6/10/93 33 */ 34 35 #ifndef _NETINET_IP_H_ 36 #define _NETINET_IP_H_ 37 38 #include <sys/cdefs.h> 39 #include <sys/types.h> 40 #include <endian.h> 41 #include <netinet/in.h> 42 #include <netinet/in_systm.h> 43 44 __BEGIN_DECLS 45 46 /* 47 * Definitions for internet protocol version 4. 48 * Per RFC 791, September 1981. 49 */ 50 #define IPVERSION 4 51 52 /* 53 * Structure of an internet header, naked of options. 54 */ 55 struct ip { 56 u_int32_t ip_hl:4, /* header length */ 57 ip_v:4; /* version */ 58 u_int8_t ip_tos; /* type of service */ 59 u_int16_t ip_len; /* total length */ 60 u_int16_t ip_id; /* identification */ 61 u_int16_t 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_int8_t ip_ttl; /* time to live */ 67 u_int8_t ip_p; /* protocol */ 68 u_int16_t ip_sum; /* checksum */ 69 struct in_addr ip_src, ip_dst; /* source and dest address */ 70 }; 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 0x02 81 #if 1 82 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 83 #define IPTOS_CE 0x01 /* congestion experienced */ 84 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 85 #endif 86 87 /* 88 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 89 */ 90 #define IPTOS_PREC_NETCONTROL 0xe0 91 #define IPTOS_PREC_INTERNETCONTROL 0xc0 92 #define IPTOS_PREC_CRITIC_ECP 0xa0 93 #define IPTOS_PREC_FLASHOVERRIDE 0x80 94 #define IPTOS_PREC_FLASH 0x60 95 #define IPTOS_PREC_IMMEDIATE 0x40 96 #define IPTOS_PREC_PRIORITY 0x20 97 #define IPTOS_PREC_ROUTINE 0x00 98 99 /* 100 * ECN (Explicit Congestion Notification) codepoints in RFC3168 101 * mapped to the lower 2 bits of the TOS field. 102 */ 103 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 104 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 105 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 106 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 107 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 108 109 /* 110 * Definitions for options. 111 */ 112 #define IPOPT_COPIED(o) ((o)&0x80) 113 #define IPOPT_CLASS(o) ((o)&0x60) 114 #define IPOPT_NUMBER(o) ((o)&0x1f) 115 116 #define IPOPT_CONTROL 0x00 117 #define IPOPT_RESERVED1 0x20 118 #define IPOPT_DEBMEAS 0x40 119 #define IPOPT_RESERVED2 0x60 120 121 #define IPOPT_EOL 0 /* end of option list */ 122 #define IPOPT_NOP 1 /* no operation */ 123 124 #define IPOPT_RR 7 /* record packet route */ 125 #define IPOPT_TS 68 /* timestamp */ 126 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 127 #define IPOPT_LSRR 131 /* loose source route */ 128 #define IPOPT_SATID 136 /* satnet id */ 129 #define IPOPT_SSRR 137 /* strict source route */ 130 131 /* 132 * Offsets to fields in options other than EOL and NOP. 133 */ 134 #define IPOPT_OPTVAL 0 /* option ID */ 135 #define IPOPT_OLEN 1 /* option length */ 136 #define IPOPT_OFFSET 2 /* offset within option */ 137 #define IPOPT_MINOFF 4 /* min value of above */ 138 139 /* 140 * Time stamp option structure. 141 */ 142 struct ip_timestamp { 143 u_int8_t ipt_code; /* IPOPT_TS */ 144 u_int8_t ipt_len; /* size of structure (variable) */ 145 u_int8_t ipt_ptr; /* index of current entry */ 146 u_int32_t ipt_flg:4, /* flags, see below */ 147 ipt_oflw:4; /* overflow counter */ 148 union ipt_timestamp { 149 n_time ipt_time[1]; 150 struct ipt_ta { 151 struct in_addr ipt_addr; 152 n_time ipt_time; 153 } ipt_ta[1]; 154 } ipt_timestamp; 155 }; 156 157 /* flag bits for ipt_flg */ 158 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 159 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 160 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 161 162 /* bits for security (not byte swapped) */ 163 #define IPOPT_SECUR_UNCLASS 0x0000 164 #define IPOPT_SECUR_CONFID 0xf135 165 #define IPOPT_SECUR_EFTO 0x789a 166 #define IPOPT_SECUR_MMMM 0xbc4d 167 #define IPOPT_SECUR_RESTR 0xaf13 168 #define IPOPT_SECUR_SECRET 0xd788 169 #define IPOPT_SECUR_TOPSECRET 0x6bc5 170 171 /* 172 * Internet implementation parameters. 173 */ 174 #define MAXTTL 255 /* maximum time to live (seconds) */ 175 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 176 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 177 #define IPTTLDEC 1 /* subtracted when forwarding */ 178 179 #define IP_MSS 576 /* default maximum segment size */ 180 181 /* 182 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 183 * checksums. For the Internet checksum, struct ipovly can be used instead. 184 * For stronger checksums, the real thing must be used. 185 */ 186 struct ippseudo { 187 struct in_addr ippseudo_src; /* source internet address */ 188 struct in_addr ippseudo_dst; /* destination internet address */ 189 u_int8_t ippseudo_pad; /* pad, must be zero */ 190 u_int8_t ippseudo_p; /* protocol */ 191 u_int16_t ippseudo_len; /* protocol length */ 192 }; 193 194 /* BIONIC addition: declarations matching the Linux kernel */ 195 /* some programs expect these... */ 196 197 #define IPOPT_OPTVAL 0 198 #define IPOPT_OLEN 1 199 #define IPOPT_OFFSET 2 200 #define IPOPT_MINOFF 4 201 #define MAX_IPOPTLEN 40 202 203 #define IPOPT_COPY 0x80 204 #define IPOPT_CLASS_MASK 0x60 205 #define IPOPT_NUMBER_MASK 0x1f 206 207 #define IPOPT_CONTROL 0x00 208 #define IPOPT_RESERVED1 0x20 209 #define IPOPT_MEASUREMENT 0x40 210 #define IPOPT_RESERVED2 0x60 211 212 #define IPOPT_END (0 |IPOPT_CONTROL) 213 #define IPOPT_NOOP (1 |IPOPT_CONTROL) 214 #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) 215 #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) 216 #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) 217 #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) 218 219 struct iphdr { 220 #if defined(__LITTLE_ENDIAN_BITFIELD) 221 uint8_t ihl :4, 222 version:4; 223 #elif defined (__BIG_ENDIAN_BITFIELD) 224 uint8_t version:4, 225 ihl :4; 226 #else 227 #error "Please fix <asm/byteorder.h>" 228 #endif 229 uint8_t tos; 230 uint16_t tot_len; 231 uint16_t id; 232 uint16_t frag_off; 233 uint8_t ttl; 234 uint8_t protocol; 235 uint16_t check; 236 int32_t saddr; 237 int32_t daddr; 238 }; 239 240 struct ip_auth_hdr { 241 uint8_t nexthdr; 242 uint8_t hdrlen; 243 uint16_t reserved; 244 uint32_t spi; 245 uint32_t seq_no; 246 uint8_t auth_data[0]; 247 }; 248 249 struct ip_esp_hdr { 250 uint32_t spi; 251 uint32_t seq_no; 252 uint8_t enc_data[0]; 253 }; 254 255 struct ip_comp_hdr { 256 uint8_t nexthdr; 257 uint8_t flags; 258 uint16_t cpi; 259 }; 260 261 __END_DECLS 262 263 #endif /* _NETINET_IP_H_ */ 264
