/* $Id: ip.h 106061 2024-09-16 14:03:52Z vboxsync $ */ /** @file * NAT - IP handling (declarations/defines). */ /* * Copyright (C) 2006-2024 Oracle and/or its affiliates. * * This file is part of VirtualBox base platform packages, as * available from https://www.virtualbox.org. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, in version 3 of the * License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . * * SPDX-License-Identifier: GPL-3.0-only */ /* * This code is based on: * * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip.h 8.1 (Berkeley) 6/10/93 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp */ #ifndef _IP_H_ #define _IP_H_ #include "queue.h" #ifdef WORDS_BIGENDIAN # ifndef NTOHL # define NTOHL(d) # endif # ifndef NTOHS # define NTOHS(d) # endif # ifndef HTONL # define HTONL(d) # endif # ifndef HTONS # define HTONS(d) # endif #else # ifndef NTOHL # define NTOHL(d) ((d) = RT_N2H_U32((d))) # endif # ifndef NTOHS # define NTOHS(d) ((d) = RT_N2H_U16((u_int16_t)(d))) # endif # ifndef HTONL # define HTONL(d) ((d) = RT_H2N_U32((d))) # endif # ifndef HTONS # define HTONS(d) ((d) = RT_H2N_U16((u_int16_t)(d))) # endif #endif /* * Definitions for internet protocol version 4. * Per RFC 791, September 1981. */ #define IPVERSION 4 /* * Structure of an internet header, naked of options. */ struct ip { #ifdef WORDS_BIGENDIAN # ifdef _MSC_VER uint8_t ip_v:4; /* version */ uint8_t ip_hl:4; /* header length */ # else unsigned ip_v:4; /* version */ unsigned ip_hl:4; /* header length */ # endif #else # ifdef _MSC_VER uint8_t ip_hl:4; /* header length */ uint8_t ip_v:4; /* version */ # else unsigned ip_hl:4; /* header length */ unsigned ip_v:4; /* version */ # endif #endif uint8_t ip_tos; /* type of service */ uint16_t ip_len; /* total length */ uint16_t ip_id; /* identification */ uint16_t ip_off; /* fragment offset field */ #define IP_DF 0x4000 /* don't fragment flag */ #define IP_MF 0x2000 /* more fragments flag */ #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ uint8_t ip_ttl; /* time to live */ uint8_t ip_p; /* protocol */ uint16_t ip_sum; /* checksum */ struct in_addr ip_src; /* source address */ struct in_addr ip_dst; /* destination address */ }; AssertCompileSize(struct ip, 20); #define IP_MAXPACKET 65535 /* maximum packet size */ /* * Definitions for IP type of service (ip_tos) */ #define IPTOS_LOWDELAY 0x10 #define IPTOS_THROUGHPUT 0x08 #define IPTOS_RELIABILITY 0x04 /* * Time stamp option structure. */ struct ip_timestamp { uint8_t ipt_code; /* IPOPT_TS */ uint8_t ipt_len; /* size of structure (variable) */ uint8_t ipt_ptr; /* index of current entry */ #ifdef WORDS_BIGENDIAN # ifdef _MSC_VER uint8_t ipt_oflw:4; /* overflow counter */ uint8_t ipt_flg:4; /* flags, see below */ # else unsigned ipt_oflw:4; /* overflow counter */ unsigned ipt_flg:4; /* flags, see below */ # endif #else # ifdef _MSC_VER uint8_t ipt_flg:4; /* flags, see below */ uint8_t ipt_oflw:4; /* overflow counter */ # else unsigned ipt_flg:4; /* flags, see below */ unsigned ipt_oflw:4; /* overflow counter */ # endif #endif union ipt_timestamp { uint32_t ipt_time[1]; struct ipt_ta { struct in_addr ipt_addr; uint32_t ipt_time; } ipt_ta[1]; } ipt_timestamp; }; AssertCompileSize(struct ip_timestamp, 12); /* * Internet implementation parameters. */ #define MAXTTL 255 /* maximum time to live (seconds) */ #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ #define IPFRAGTTL 60 /* time to live for frags, slowhz */ #define IPTTLDEC 1 /* subtracted when forwarding */ #define IP_MSS 576 /* default maximum segment size */ #ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */ # include #else typedef caddr_t caddr32_t; #endif #if SIZEOF_CHAR_P == 4 typedef struct ipq_t *ipqp_32; typedef struct ipasfrag *ipasfragp_32; #else typedef caddr32_t ipqp_32; typedef caddr32_t ipasfragp_32; #endif /* * Overlay for ip header used by other protocols (tcp, udp). */ struct ipovly { u_int8_t ih_x1[9]; /* (unused) */ u_int8_t ih_pr; /* protocol */ u_int16_t ih_len; /* protocol length */ struct in_addr ih_src; /* source internet address */ struct in_addr ih_dst; /* destination internet address */ }; AssertCompileSize(struct ipovly, 20); /* * Ip reassembly queue structure. Each fragment being reassembled is * attached to one of these structures. They are timed out after ipq_ttl * drops to 0, and may also be reclaimed if memory becomes tight. * size 28 bytes */ struct ipq_t { TAILQ_ENTRY(ipq_t) ipq_list; u_int8_t ipq_ttl; /* time for reass q to live */ u_int8_t ipq_p; /* protocol of this fragment */ u_int16_t ipq_id; /* sequence id for reassembly */ struct mbuf *ipq_frags; /* to ip headers of fragments */ uint8_t ipq_nfrags; /* # of fragments in this packet */ struct in_addr ipq_src; struct in_addr ipq_dst; }; /* * IP datagram reassembly. */ #define IPREASS_NHASH_LOG2 6 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2) #define IPREASS_HMASK (IPREASS_NHASH - 1) #define IPREASS_HASH(x,y) \ (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK) TAILQ_HEAD(ipqhead, ipq_t); /* * Structure attached to inpcb.ip_moptions and * passed to ip_output when IP multicast options are in use. */ struct ipstat_t { u_long ips_total; /* total packets received */ u_long ips_badsum; /* checksum bad */ u_long ips_tooshort; /* packet too short */ u_long ips_toosmall; /* not enough data */ u_long ips_badhlen; /* ip header length < data size */ u_long ips_badlen; /* ip length < ip header length */ u_long ips_fragments; /* fragments received */ u_long ips_fragdropped; /* frags dropped (dups, out of space) */ u_long ips_fragtimeout; /* fragments timed out */ u_long ips_forward; /* packets forwarded */ u_long ips_cantforward; /* packets rcvd for unreachable dest */ u_long ips_redirectsent; /* packets forwarded on same net */ u_long ips_noproto; /* unknown or unsupported protocol */ u_long ips_delivered; /* datagrams delivered to upper level*/ u_long ips_localout; /* total ip packets generated here */ u_long ips_odropped; /* lost packets due to nobufs, etc. */ u_long ips_reassembled; /* total packets reassembled ok */ u_long ips_fragmented; /* datagrams successfully fragmented */ u_long ips_ofragments; /* output fragments created */ u_long ips_cantfrag; /* don't fragment flag was set, etc. */ u_long ips_badoptions; /* error in option processing */ u_long ips_noroute; /* packets discarded due to no route */ u_long ips_badvers; /* ip version != 4 */ u_long ips_rawout; /* total raw ip packets generated */ u_long ips_unaligned; /* times the ip packet was not aligned */ }; #endif