| 1 | /* $Id: ip.h 98103 2023-01-17 14:15:46Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * NAT - IP handling (declarations/defines).
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox base platform packages, as
|
|---|
| 10 | * available from https://www.virtualbox.org.
|
|---|
| 11 | *
|
|---|
| 12 | * This program is free software; you can redistribute it and/or
|
|---|
| 13 | * modify it under the terms of the GNU General Public License
|
|---|
| 14 | * as published by the Free Software Foundation, in version 3 of the
|
|---|
| 15 | * License.
|
|---|
| 16 | *
|
|---|
| 17 | * This program is distributed in the hope that it will be useful, but
|
|---|
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 20 | * General Public License for more details.
|
|---|
| 21 | *
|
|---|
| 22 | * You should have received a copy of the GNU General Public License
|
|---|
| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 24 | *
|
|---|
| 25 | * SPDX-License-Identifier: GPL-3.0-only
|
|---|
| 26 | */
|
|---|
| 27 |
|
|---|
| 28 | /*
|
|---|
| 29 | * This code is based on:
|
|---|
| 30 | *
|
|---|
| 31 | * Copyright (c) 1982, 1986, 1993
|
|---|
| 32 | * The Regents of the University of California. All rights reserved.
|
|---|
| 33 | *
|
|---|
| 34 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 35 | * modification, are permitted provided that the following conditions
|
|---|
| 36 | * are met:
|
|---|
| 37 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 38 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 39 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 40 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 41 | * documentation and/or other materials provided with the distribution.
|
|---|
| 42 | * 3. Neither the name of the University nor the names of its contributors
|
|---|
| 43 | * may be used to endorse or promote products derived from this software
|
|---|
| 44 | * without specific prior written permission.
|
|---|
| 45 | *
|
|---|
| 46 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 47 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 48 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 49 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|---|
| 50 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 51 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 52 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 53 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 54 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 55 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 56 | * SUCH DAMAGE.
|
|---|
| 57 | *
|
|---|
| 58 | * @(#)ip.h 8.1 (Berkeley) 6/10/93
|
|---|
| 59 | * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
|
|---|
| 60 | */
|
|---|
| 61 |
|
|---|
| 62 | #ifndef _IP_H_
|
|---|
| 63 | #define _IP_H_
|
|---|
| 64 |
|
|---|
| 65 | #include "queue.h"
|
|---|
| 66 |
|
|---|
| 67 | #ifdef WORDS_BIGENDIAN
|
|---|
| 68 | # ifndef NTOHL
|
|---|
| 69 | # define NTOHL(d)
|
|---|
| 70 | # endif
|
|---|
| 71 | # ifndef NTOHS
|
|---|
| 72 | # define NTOHS(d)
|
|---|
| 73 | # endif
|
|---|
| 74 | # ifndef HTONL
|
|---|
| 75 | # define HTONL(d)
|
|---|
| 76 | # endif
|
|---|
| 77 | # ifndef HTONS
|
|---|
| 78 | # define HTONS(d)
|
|---|
| 79 | # endif
|
|---|
| 80 | #else
|
|---|
| 81 | # ifndef NTOHL
|
|---|
| 82 | # define NTOHL(d) ((d) = RT_N2H_U32((d)))
|
|---|
| 83 | # endif
|
|---|
| 84 | # ifndef NTOHS
|
|---|
| 85 | # define NTOHS(d) ((d) = RT_N2H_U16((u_int16_t)(d)))
|
|---|
| 86 | # endif
|
|---|
| 87 | # ifndef HTONL
|
|---|
| 88 | # define HTONL(d) ((d) = RT_H2N_U32((d)))
|
|---|
| 89 | # endif
|
|---|
| 90 | # ifndef HTONS
|
|---|
| 91 | # define HTONS(d) ((d) = RT_H2N_U16((u_int16_t)(d)))
|
|---|
| 92 | # endif
|
|---|
| 93 | #endif
|
|---|
| 94 |
|
|---|
| 95 | /*
|
|---|
| 96 | * Definitions for internet protocol version 4.
|
|---|
| 97 | * Per RFC 791, September 1981.
|
|---|
| 98 | */
|
|---|
| 99 | #define IPVERSION 4
|
|---|
| 100 |
|
|---|
| 101 | /*
|
|---|
| 102 | * Structure of an internet header, naked of options.
|
|---|
| 103 | */
|
|---|
| 104 | struct ip
|
|---|
| 105 | {
|
|---|
| 106 | #ifdef WORDS_BIGENDIAN
|
|---|
| 107 | # ifdef _MSC_VER
|
|---|
| 108 | uint8_t ip_v:4; /* version */
|
|---|
| 109 | uint8_t ip_hl:4; /* header length */
|
|---|
| 110 | # else
|
|---|
| 111 | unsigned ip_v:4; /* version */
|
|---|
| 112 | unsigned ip_hl:4; /* header length */
|
|---|
| 113 | # endif
|
|---|
| 114 | #else
|
|---|
| 115 | # ifdef _MSC_VER
|
|---|
| 116 | uint8_t ip_hl:4; /* header length */
|
|---|
| 117 | uint8_t ip_v:4; /* version */
|
|---|
| 118 | # else
|
|---|
| 119 | unsigned ip_hl:4; /* header length */
|
|---|
| 120 | unsigned ip_v:4; /* version */
|
|---|
| 121 | # endif
|
|---|
| 122 | #endif
|
|---|
| 123 | uint8_t ip_tos; /* type of service */
|
|---|
| 124 | uint16_t ip_len; /* total length */
|
|---|
| 125 | uint16_t ip_id; /* identification */
|
|---|
| 126 | uint16_t ip_off; /* fragment offset field */
|
|---|
| 127 | #define IP_DF 0x4000 /* don't fragment flag */
|
|---|
| 128 | #define IP_MF 0x2000 /* more fragments flag */
|
|---|
| 129 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
|
|---|
| 130 | uint8_t ip_ttl; /* time to live */
|
|---|
| 131 | uint8_t ip_p; /* protocol */
|
|---|
| 132 | uint16_t ip_sum; /* checksum */
|
|---|
| 133 | struct in_addr ip_src; /* source address */
|
|---|
| 134 | struct in_addr ip_dst; /* destination address */
|
|---|
| 135 | };
|
|---|
| 136 | AssertCompileSize(struct ip, 20);
|
|---|
| 137 |
|
|---|
| 138 | #define IP_MAXPACKET 65535 /* maximum packet size */
|
|---|
| 139 |
|
|---|
| 140 | /*
|
|---|
| 141 | * Definitions for IP type of service (ip_tos)
|
|---|
| 142 | */
|
|---|
| 143 | #define IPTOS_LOWDELAY 0x10
|
|---|
| 144 | #define IPTOS_THROUGHPUT 0x08
|
|---|
| 145 | #define IPTOS_RELIABILITY 0x04
|
|---|
| 146 |
|
|---|
| 147 |
|
|---|
| 148 | /*
|
|---|
| 149 | * Time stamp option structure.
|
|---|
| 150 | */
|
|---|
| 151 | struct ip_timestamp
|
|---|
| 152 | {
|
|---|
| 153 | uint8_t ipt_code; /* IPOPT_TS */
|
|---|
| 154 | uint8_t ipt_len; /* size of structure (variable) */
|
|---|
| 155 | uint8_t ipt_ptr; /* index of current entry */
|
|---|
| 156 | #ifdef WORDS_BIGENDIAN
|
|---|
| 157 | # ifdef _MSC_VER
|
|---|
| 158 | uint8_t ipt_oflw:4; /* overflow counter */
|
|---|
| 159 | uint8_t ipt_flg:4; /* flags, see below */
|
|---|
| 160 | # else
|
|---|
| 161 | unsigned ipt_oflw:4; /* overflow counter */
|
|---|
| 162 | unsigned ipt_flg:4; /* flags, see below */
|
|---|
| 163 | # endif
|
|---|
| 164 | #else
|
|---|
| 165 | # ifdef _MSC_VER
|
|---|
| 166 | uint8_t ipt_flg:4; /* flags, see below */
|
|---|
| 167 | uint8_t ipt_oflw:4; /* overflow counter */
|
|---|
| 168 | # else
|
|---|
| 169 | unsigned ipt_flg:4; /* flags, see below */
|
|---|
| 170 | unsigned ipt_oflw:4; /* overflow counter */
|
|---|
| 171 | # endif
|
|---|
| 172 | #endif
|
|---|
| 173 | union ipt_timestamp
|
|---|
| 174 | {
|
|---|
| 175 | uint32_t ipt_time[1];
|
|---|
| 176 | struct ipt_ta
|
|---|
| 177 | {
|
|---|
| 178 | struct in_addr ipt_addr;
|
|---|
| 179 | uint32_t ipt_time;
|
|---|
| 180 | } ipt_ta[1];
|
|---|
| 181 | } ipt_timestamp;
|
|---|
| 182 | };
|
|---|
| 183 | AssertCompileSize(struct ip_timestamp, 12);
|
|---|
| 184 |
|
|---|
| 185 | /*
|
|---|
| 186 | * Internet implementation parameters.
|
|---|
| 187 | */
|
|---|
| 188 | #define MAXTTL 255 /* maximum time to live (seconds) */
|
|---|
| 189 | #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
|
|---|
| 190 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */
|
|---|
| 191 | #define IPTTLDEC 1 /* subtracted when forwarding */
|
|---|
| 192 |
|
|---|
| 193 | #define IP_MSS 576 /* default maximum segment size */
|
|---|
| 194 |
|
|---|
| 195 | #ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */
|
|---|
| 196 | # include <sys/types32.h>
|
|---|
| 197 | #else
|
|---|
| 198 | typedef caddr_t caddr32_t;
|
|---|
| 199 | #endif
|
|---|
| 200 |
|
|---|
| 201 | #if SIZEOF_CHAR_P == 4
|
|---|
| 202 | typedef struct ipq_t *ipqp_32;
|
|---|
| 203 | typedef struct ipasfrag *ipasfragp_32;
|
|---|
| 204 | #else
|
|---|
| 205 | typedef caddr32_t ipqp_32;
|
|---|
| 206 | typedef caddr32_t ipasfragp_32;
|
|---|
| 207 | #endif
|
|---|
| 208 |
|
|---|
| 209 | /*
|
|---|
| 210 | * Overlay for ip header used by other protocols (tcp, udp).
|
|---|
| 211 | */
|
|---|
| 212 | struct ipovly
|
|---|
| 213 | {
|
|---|
| 214 | u_int8_t ih_x1[9]; /* (unused) */
|
|---|
| 215 | u_int8_t ih_pr; /* protocol */
|
|---|
| 216 | u_int16_t ih_len; /* protocol length */
|
|---|
| 217 | struct in_addr ih_src; /* source internet address */
|
|---|
| 218 | struct in_addr ih_dst; /* destination internet address */
|
|---|
| 219 | };
|
|---|
| 220 | AssertCompileSize(struct ipovly, 20);
|
|---|
| 221 |
|
|---|
| 222 | /*
|
|---|
| 223 | * Ip reassembly queue structure. Each fragment being reassembled is
|
|---|
| 224 | * attached to one of these structures. They are timed out after ipq_ttl
|
|---|
| 225 | * drops to 0, and may also be reclaimed if memory becomes tight.
|
|---|
| 226 | * size 28 bytes
|
|---|
| 227 | */
|
|---|
| 228 | struct ipq_t
|
|---|
| 229 | {
|
|---|
| 230 | TAILQ_ENTRY(ipq_t) ipq_list;
|
|---|
| 231 | u_int8_t ipq_ttl; /* time for reass q to live */
|
|---|
| 232 | u_int8_t ipq_p; /* protocol of this fragment */
|
|---|
| 233 | u_int16_t ipq_id; /* sequence id for reassembly */
|
|---|
| 234 | struct mbuf *ipq_frags; /* to ip headers of fragments */
|
|---|
| 235 | uint8_t ipq_nfrags; /* # of fragments in this packet */
|
|---|
| 236 | struct in_addr ipq_src;
|
|---|
| 237 | struct in_addr ipq_dst;
|
|---|
| 238 | };
|
|---|
| 239 |
|
|---|
| 240 |
|
|---|
| 241 | /*
|
|---|
| 242 | * IP datagram reassembly.
|
|---|
| 243 | */
|
|---|
| 244 | #define IPREASS_NHASH_LOG2 6
|
|---|
| 245 | #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
|
|---|
| 246 | #define IPREASS_HMASK (IPREASS_NHASH - 1)
|
|---|
| 247 | #define IPREASS_HASH(x,y) \
|
|---|
| 248 | (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
|
|---|
| 249 | TAILQ_HEAD(ipqhead, ipq_t);
|
|---|
| 250 |
|
|---|
| 251 | /*
|
|---|
| 252 | * Structure attached to inpcb.ip_moptions and
|
|---|
| 253 | * passed to ip_output when IP multicast options are in use.
|
|---|
| 254 | */
|
|---|
| 255 |
|
|---|
| 256 | struct ipstat_t
|
|---|
| 257 | {
|
|---|
| 258 | u_long ips_total; /* total packets received */
|
|---|
| 259 | u_long ips_badsum; /* checksum bad */
|
|---|
| 260 | u_long ips_tooshort; /* packet too short */
|
|---|
| 261 | u_long ips_toosmall; /* not enough data */
|
|---|
| 262 | u_long ips_badhlen; /* ip header length < data size */
|
|---|
| 263 | u_long ips_badlen; /* ip length < ip header length */
|
|---|
| 264 | u_long ips_fragments; /* fragments received */
|
|---|
| 265 | u_long ips_fragdropped; /* frags dropped (dups, out of space) */
|
|---|
| 266 | u_long ips_fragtimeout; /* fragments timed out */
|
|---|
| 267 | u_long ips_forward; /* packets forwarded */
|
|---|
| 268 | u_long ips_cantforward; /* packets rcvd for unreachable dest */
|
|---|
| 269 | u_long ips_redirectsent; /* packets forwarded on same net */
|
|---|
| 270 | u_long ips_noproto; /* unknown or unsupported protocol */
|
|---|
| 271 | u_long ips_delivered; /* datagrams delivered to upper level*/
|
|---|
| 272 | u_long ips_localout; /* total ip packets generated here */
|
|---|
| 273 | u_long ips_odropped; /* lost packets due to nobufs, etc. */
|
|---|
| 274 | u_long ips_reassembled; /* total packets reassembled ok */
|
|---|
| 275 | u_long ips_fragmented; /* datagrams successfully fragmented */
|
|---|
| 276 | u_long ips_ofragments; /* output fragments created */
|
|---|
| 277 | u_long ips_cantfrag; /* don't fragment flag was set, etc. */
|
|---|
| 278 | u_long ips_badoptions; /* error in option processing */
|
|---|
| 279 | u_long ips_noroute; /* packets discarded due to no route */
|
|---|
| 280 | u_long ips_badvers; /* ip version != 4 */
|
|---|
| 281 | u_long ips_rawout; /* total raw ip packets generated */
|
|---|
| 282 | u_long ips_unaligned; /* times the ip packet was not aligned */
|
|---|
| 283 | };
|
|---|
| 284 |
|
|---|
| 285 | #endif
|
|---|
