1/* SPDX-License-Identifier: BSD-3-Clause */ 2/* 3 * Copyright (c) 1982, 1986, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)ip.h 8.1 (Berkeley) 6/10/93 31 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp 32 */ 33 34#ifndef IP_H 35#define IP_H 36 37#include <glib.h> 38 39#if G_BYTE_ORDER == G_BIG_ENDIAN 40# undef NTOHL 41# undef NTOHS 42# undef HTONL 43# undef HTONS 44# define NTOHL(d) 45# define NTOHS(d) 46# define HTONL(d) 47# define HTONS(d) 48#else 49# ifndef NTOHL 50# define NTOHL(d) ((d) = ntohl((d))) 51# endif 52# ifndef NTOHS 53# define NTOHS(d) ((d) = ntohs((uint16_t)(d))) 54# endif 55# ifndef HTONL 56# define HTONL(d) ((d) = htonl((d))) 57# endif 58# ifndef HTONS 59# define HTONS(d) ((d) = htons((uint16_t)(d))) 60# endif 61#endif 62 63typedef uint32_t n_long; /* long as received from the net */ 64 65/* 66 * Definitions for internet protocol version 4. 67 * Per RFC 791, September 1981. 68 */ 69#define IPVERSION 4 70 71/* 72 * Structure of an internet header, naked of options. 73 */ 74struct ip { 75#if G_BYTE_ORDER == G_BIG_ENDIAN 76 uint8_t ip_v:4, /* version */ 77 ip_hl:4; /* header length */ 78#else 79 uint8_t ip_hl:4, /* header length */ 80 ip_v:4; /* version */ 81#endif 82 uint8_t ip_tos; /* type of service */ 83 uint16_t ip_len; /* total length */ 84 uint16_t ip_id; /* identification */ 85 uint16_t ip_off; /* fragment offset field */ 86#define IP_DF 0x4000 /* don't fragment flag */ 87#define IP_MF 0x2000 /* more fragments flag */ 88#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 89 uint8_t ip_ttl; /* time to live */ 90 uint8_t ip_p; /* protocol */ 91 uint16_t ip_sum; /* checksum */ 92 struct in_addr ip_src,ip_dst; /* source and dest address */ 93} SLIRP_PACKED; 94 95#define IP_MAXPACKET 65535 /* maximum packet size */ 96 97/* 98 * Definitions for IP type of service (ip_tos) 99 */ 100#define IPTOS_LOWDELAY 0x10 101#define IPTOS_THROUGHPUT 0x08 102#define IPTOS_RELIABILITY 0x04 103 104/* 105 * Definitions for options. 106 */ 107#define IPOPT_COPIED(o) ((o)&0x80) 108#define IPOPT_CLASS(o) ((o)&0x60) 109#define IPOPT_NUMBER(o) ((o)&0x1f) 110 111#define IPOPT_CONTROL 0x00 112#define IPOPT_RESERVED1 0x20 113#define IPOPT_DEBMEAS 0x40 114#define IPOPT_RESERVED2 0x60 115 116#define IPOPT_EOL 0 /* end of option list */ 117#define IPOPT_NOP 1 /* no operation */ 118 119#define IPOPT_RR 7 /* record packet route */ 120#define IPOPT_TS 68 /* timestamp */ 121#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 122#define IPOPT_LSRR 131 /* loose source route */ 123#define IPOPT_SATID 136 /* satnet id */ 124#define IPOPT_SSRR 137 /* strict source route */ 125 126/* 127 * Offsets to fields in options other than EOL and NOP. 128 */ 129#define IPOPT_OPTVAL 0 /* option ID */ 130#define IPOPT_OLEN 1 /* option length */ 131#define IPOPT_OFFSET 2 /* offset within option */ 132#define IPOPT_MINOFF 4 /* min value of above */ 133 134/* 135 * Time stamp option structure. 136 */ 137struct ip_timestamp { 138 uint8_t ipt_code; /* IPOPT_TS */ 139 uint8_t ipt_len; /* size of structure (variable) */ 140 uint8_t ipt_ptr; /* index of current entry */ 141#if G_BYTE_ORDER == G_BIG_ENDIAN 142 uint8_t ipt_oflw:4, /* overflow counter */ 143 ipt_flg:4; /* flags, see below */ 144#else 145 uint8_t ipt_flg:4, /* flags, see below */ 146 ipt_oflw:4; /* overflow counter */ 147#endif 148 union ipt_timestamp { 149 n_long ipt_time[1]; 150 struct ipt_ta { 151 struct in_addr ipt_addr; 152 n_long ipt_time; 153 } ipt_ta[1]; 154 } ipt_timestamp; 155} SLIRP_PACKED; 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#if GLIB_SIZEOF_VOID_P == 4 182struct mbuf_ptr { 183 struct mbuf *mptr; 184 uint32_t dummy; 185} SLIRP_PACKED; 186#else 187struct mbuf_ptr { 188 struct mbuf *mptr; 189} SLIRP_PACKED; 190#endif 191struct qlink { 192 void *next, *prev; 193}; 194 195/* 196 * Overlay for ip header used by other protocols (tcp, udp). 197 */ 198struct ipovly { 199 struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ 200 uint8_t ih_x1; /* (unused) */ 201 uint8_t ih_pr; /* protocol */ 202 uint16_t ih_len; /* protocol length */ 203 struct in_addr ih_src; /* source internet address */ 204 struct in_addr ih_dst; /* destination internet address */ 205} SLIRP_PACKED; 206 207/* 208 * Ip reassembly queue structure. Each fragment 209 * being reassembled is attached to one of these structures. 210 * They are timed out after ipq_ttl drops to 0, and may also 211 * be reclaimed if memory becomes tight. 212 * size 28 bytes 213 */ 214struct ipq { 215 struct qlink frag_link; /* to ip headers of fragments */ 216 struct qlink ip_link; /* to other reass headers */ 217 uint8_t ipq_ttl; /* time for reass q to live */ 218 uint8_t ipq_p; /* protocol of this fragment */ 219 uint16_t ipq_id; /* sequence id for reassembly */ 220 struct in_addr ipq_src,ipq_dst; 221}; 222 223/* 224 * Ip header, when holding a fragment. 225 * 226 * Note: ipf_link must be at same offset as frag_link above 227 */ 228struct ipasfrag { 229 struct qlink ipf_link; 230 struct ip ipf_ip; 231}; 232 233G_STATIC_ASSERT(offsetof(struct ipq, frag_link) == 234 offsetof(struct ipasfrag, ipf_link)); 235 236#define ipf_off ipf_ip.ip_off 237#define ipf_tos ipf_ip.ip_tos 238#define ipf_len ipf_ip.ip_len 239#define ipf_next ipf_link.next 240#define ipf_prev ipf_link.prev 241 242#endif 243