ip.h revision 413f05aaf54fa08c0ae7e997327a4f4a473c0a8d
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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip.h 8.1 (Berkeley) 6/10/93 34 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp 35 */ 36 37#ifndef _IP_H_ 38#define _IP_H_ 39 40#ifdef WORDS_BIGENDIAN 41# ifndef NTOHL 42# define NTOHL(d) 43# endif 44# ifndef NTOHS 45# define NTOHS(d) 46# endif 47# ifndef HTONL 48# define HTONL(d) 49# endif 50# ifndef HTONS 51# define HTONS(d) 52# endif 53#else 54# ifndef NTOHL 55# define NTOHL(d) ((d) = ntohl((d))) 56# endif 57# ifndef NTOHS 58# define NTOHS(d) ((d) = ntohs((u_int16_t)(d))) 59# endif 60# ifndef HTONL 61# define HTONL(d) ((d) = htonl((d))) 62# endif 63# ifndef HTONS 64# define HTONS(d) ((d) = htons((u_int16_t)(d))) 65# endif 66#endif 67 68typedef u_int32_t n_long; /* long as received from the net */ 69 70/* 71 * Definitions for internet protocol version 4. 72 * Per RFC 791, September 1981. 73 */ 74#define IPVERSION 4 75 76/* 77 * Structure of an internet header, naked of options. 78 */ 79struct ip { 80#ifdef WORDS_BIGENDIAN 81 u_int ip_v:4, /* version */ 82 ip_hl:4; /* header length */ 83#else 84 u_int ip_hl:4, /* header length */ 85 ip_v:4; /* version */ 86#endif 87 u_int8_t ip_tos; /* type of service */ 88 u_int16_t ip_len; /* total length */ 89 u_int16_t ip_id; /* identification */ 90 u_int16_t ip_off; /* fragment offset field */ 91#define IP_DF 0x4000 /* don't fragment flag */ 92#define IP_MF 0x2000 /* more fragments flag */ 93#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 94 u_int8_t ip_ttl; /* time to live */ 95 u_int8_t ip_p; /* protocol */ 96 u_int16_t ip_sum; /* checksum */ 97 struct in_addr ip_src,ip_dst; /* source and dest address */ 98}; 99 100#define IP_MAXPACKET 65535 /* maximum packet size */ 101 102/* 103 * Definitions for IP type of service (ip_tos) 104 */ 105#define IPTOS_LOWDELAY 0x10 106#define IPTOS_THROUGHPUT 0x08 107#define IPTOS_RELIABILITY 0x04 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 */ 142struct 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#ifdef WORDS_BIGENDIAN 147 u_int ipt_oflw:4, /* overflow counter */ 148 ipt_flg:4; /* flags, see below */ 149#else 150 u_int ipt_flg:4, /* flags, see below */ 151 ipt_oflw:4; /* overflow counter */ 152#endif 153 union ipt_timestamp { 154 n_long ipt_time[1]; 155 struct ipt_ta { 156 struct in_addr ipt_addr; 157 n_long ipt_time; 158 } ipt_ta[1]; 159 } ipt_timestamp; 160}; 161 162/* flag bits for ipt_flg */ 163#define IPOPT_TS_TSONLY 0 /* timestamps only */ 164#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 165#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 166 167/* bits for security (not byte swapped) */ 168#define IPOPT_SECUR_UNCLASS 0x0000 169#define IPOPT_SECUR_CONFID 0xf135 170#define IPOPT_SECUR_EFTO 0x789a 171#define IPOPT_SECUR_MMMM 0xbc4d 172#define IPOPT_SECUR_RESTR 0xaf13 173#define IPOPT_SECUR_SECRET 0xd788 174#define IPOPT_SECUR_TOPSECRET 0x6bc5 175 176/* 177 * Internet implementation parameters. 178 */ 179#define MAXTTL 255 /* maximum time to live (seconds) */ 180#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 181#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 182#define IPTTLDEC 1 /* subtracted when forwarding */ 183 184#define IP_MSS 576 /* default maximum segment size */ 185 186#ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */ 187#include <sys/types32.h> 188#else 189#if SIZEOF_CHAR_P == 4 190typedef caddr_t caddr32_t; 191#else 192typedef u_int32_t caddr32_t; 193#endif 194#endif 195 196#if SIZEOF_CHAR_P == 4 197typedef struct ipq *ipqp_32; 198typedef struct ipasfrag *ipasfragp_32; 199#else 200typedef caddr32_t ipqp_32; 201typedef caddr32_t ipasfragp_32; 202#endif 203 204/* 205 * Overlay for ip header used by other protocols (tcp, udp). 206 */ 207struct ipovly { 208 caddr32_t ih_next, ih_prev; /* for protocol sequence q's */ 209 u_int8_t ih_x1; /* (unused) */ 210 u_int8_t ih_pr; /* protocol */ 211 u_int16_t ih_len; /* protocol length */ 212 struct in_addr ih_src; /* source internet address */ 213 struct in_addr ih_dst; /* destination internet address */ 214}; 215 216/* 217 * Ip reassembly queue structure. Each fragment 218 * being reassembled is attached to one of these structures. 219 * They are timed out after ipq_ttl drops to 0, and may also 220 * be reclaimed if memory becomes tight. 221 * size 28 bytes 222 */ 223struct ipq { 224 ipqp_32 next,prev; /* to other reass headers */ 225 u_int8_t ipq_ttl; /* time for reass q to live */ 226 u_int8_t ipq_p; /* protocol of this fragment */ 227 u_int16_t ipq_id; /* sequence id for reassembly */ 228 ipasfragp_32 ipq_next,ipq_prev; 229 /* to ip headers of fragments */ 230 struct in_addr ipq_src,ipq_dst; 231}; 232 233/* 234 * Ip header, when holding a fragment. 235 * 236 * Note: ipf_next must be at same offset as ipq_next above 237 */ 238struct ipasfrag { 239#ifdef WORDS_BIGENDIAN 240 u_int ip_v:4, 241 ip_hl:4; 242#else 243 u_int ip_hl:4, 244 ip_v:4; 245#endif 246 /* BUG : u_int changed to u_int8_t. 247 * sizeof(u_int)==4 on linux 2.0 248 */ 249 u_int8_t ipf_mff; /* XXX overlays ip_tos: use low bit 250 * to avoid destroying tos (PPPDTRuu); 251 * copied from (ip_off&IP_MF) */ 252 u_int16_t ip_len; 253 u_int16_t ip_id; 254 u_int16_t ip_off; 255 u_int8_t ip_ttl; 256 u_int8_t ip_p; 257 u_int16_t ip_sum; 258 ipasfragp_32 ipf_next; /* next fragment */ 259 ipasfragp_32 ipf_prev; /* previous fragment */ 260}; 261 262/* 263 * Structure stored in mbuf in inpcb.ip_options 264 * and passed to ip_output when ip options are in use. 265 * The actual length of the options (including ipopt_dst) 266 * is in m_len. 267 */ 268#define MAX_IPOPTLEN 40 269 270struct ipoption { 271 struct in_addr ipopt_dst; /* first-hop dst if source routed */ 272 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */ 273}; 274 275/* 276 * Structure attached to inpcb.ip_moptions and 277 * passed to ip_output when IP multicast options are in use. 278 */ 279 280struct ipstat { 281 u_long ips_total; /* total packets received */ 282 u_long ips_badsum; /* checksum bad */ 283 u_long ips_tooshort; /* packet too short */ 284 u_long ips_toosmall; /* not enough data */ 285 u_long ips_badhlen; /* ip header length < data size */ 286 u_long ips_badlen; /* ip length < ip header length */ 287 u_long ips_fragments; /* fragments received */ 288 u_long ips_fragdropped; /* frags dropped (dups, out of space) */ 289 u_long ips_fragtimeout; /* fragments timed out */ 290 u_long ips_forward; /* packets forwarded */ 291 u_long ips_cantforward; /* packets rcvd for unreachable dest */ 292 u_long ips_redirectsent; /* packets forwarded on same net */ 293 u_long ips_noproto; /* unknown or unsupported protocol */ 294 u_long ips_delivered; /* datagrams delivered to upper level*/ 295 u_long ips_localout; /* total ip packets generated here */ 296 u_long ips_odropped; /* lost packets due to nobufs, etc. */ 297 u_long ips_reassembled; /* total packets reassembled ok */ 298 u_long ips_fragmented; /* datagrams successfully fragmented */ 299 u_long ips_ofragments; /* output fragments created */ 300 u_long ips_cantfrag; /* don't fragment flag was set, etc. */ 301 u_long ips_badoptions; /* error in option processing */ 302 u_long ips_noroute; /* packets discarded due to no route */ 303 u_long ips_badvers; /* ip version != 4 */ 304 u_long ips_rawout; /* total raw ip packets generated */ 305 u_long ips_unaligned; /* times the ip packet was not aligned */ 306}; 307 308extern struct ipstat ipstat; 309extern struct ipq ipq; /* ip reass. queue */ 310extern u_int16_t ip_id; /* ip packet ctr, for ids */ 311extern int ip_defttl; /* default IP ttl */ 312 313#endif 314