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/* $Id: ip.h $ */
/** @file
* NAT - IP handling (declarations/defines).
*/
/*
* Copyright (C) 2006-2023 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 <https://www.gnu.org/licenses>.
*
* 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 <sys/types32.h>
#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
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