276 lines
8.1 KiB
C
276 lines
8.1 KiB
C
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/* $OpenBSD: ip.h,v 1.12 2006/04/27 02:19:32 tedu Exp $ */
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/* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ip.h 8.1 (Berkeley) 6/10/93
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*/
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#ifndef _NETINET_IP_H_
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#define _NETINET_IP_H_
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <endian.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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__BEGIN_DECLS
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/*
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* Definitions for internet protocol version 4.
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* Per RFC 791, September 1981.
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*/
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#define IPVERSION 4
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/*
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* Structure of an internet header, naked of options.
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*/
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struct ip {
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#if BYTE_ORDER == LITTLE_ENDIAN
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u_int32_t ip_hl:4, /* header length */
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ip_v:4; /* version */
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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u_int32_t ip_v:4, /* version */
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ip_hl:4; /* header length */
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#endif
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u_int8_t ip_tos; /* type of service */
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u_int16_t ip_len; /* total length */
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u_int16_t ip_id; /* identification */
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u_int16_t ip_off; /* fragment offset field */
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#define IP_RF 0x8000 /* reserved fragment flag */
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#define IP_DF 0x4000 /* dont fragment flag */
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#define IP_MF 0x2000 /* more fragments flag */
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#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
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u_int8_t ip_ttl; /* time to live */
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u_int8_t ip_p; /* protocol */
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u_int16_t ip_sum; /* checksum */
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struct in_addr ip_src, ip_dst; /* source and dest address */
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};
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#define IP_MAXPACKET 65535 /* maximum packet size */
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/*
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* Definitions for IP type of service (ip_tos)
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*/
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#define IPTOS_LOWDELAY 0x10
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#define IPTOS_THROUGHPUT 0x08
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#define IPTOS_RELIABILITY 0x04
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/* IPTOS_LOWCOST 0x02 XXX */
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#if 1
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/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
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#define IPTOS_CE 0x01 /* congestion experienced */
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#define IPTOS_ECT 0x02 /* ECN-capable transport */
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#endif
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/*
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* Definitions for IP precedence (also in ip_tos) (hopefully unused)
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*/
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#define IPTOS_PREC_NETCONTROL 0xe0
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#define IPTOS_PREC_INTERNETCONTROL 0xc0
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#define IPTOS_PREC_CRITIC_ECP 0xa0
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#define IPTOS_PREC_FLASHOVERRIDE 0x80
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#define IPTOS_PREC_FLASH 0x60
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#define IPTOS_PREC_IMMEDIATE 0x40
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#define IPTOS_PREC_PRIORITY 0x20
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#define IPTOS_PREC_ROUTINE 0x00
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/*
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* ECN (Explicit Congestion Notification) codepoints in RFC3168
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* mapped to the lower 2 bits of the TOS field.
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*/
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#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
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#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
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#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
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#define IPTOS_ECN_CE 0x03 /* congestion experienced */
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#define IPTOS_ECN_MASK 0x03 /* ECN field mask */
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/*
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* Definitions for options.
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*/
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#define IPOPT_COPIED(o) ((o)&0x80)
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#define IPOPT_CLASS(o) ((o)&0x60)
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#define IPOPT_NUMBER(o) ((o)&0x1f)
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#define IPOPT_CONTROL 0x00
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#define IPOPT_RESERVED1 0x20
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#define IPOPT_DEBMEAS 0x40
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#define IPOPT_RESERVED2 0x60
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#define IPOPT_EOL 0 /* end of option list */
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#define IPOPT_NOP 1 /* no operation */
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#define IPOPT_RR 7 /* record packet route */
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#define IPOPT_TS 68 /* timestamp */
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#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
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#define IPOPT_LSRR 131 /* loose source route */
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#define IPOPT_SATID 136 /* satnet id */
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#define IPOPT_SSRR 137 /* strict source route */
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/*
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* Offsets to fields in options other than EOL and NOP.
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*/
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#define IPOPT_OPTVAL 0 /* option ID */
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#define IPOPT_OLEN 1 /* option length */
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#define IPOPT_OFFSET 2 /* offset within option */
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#define IPOPT_MINOFF 4 /* min value of above */
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/*
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* Time stamp option structure.
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*/
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struct ip_timestamp {
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u_int8_t ipt_code; /* IPOPT_TS */
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u_int8_t ipt_len; /* size of structure (variable) */
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u_int8_t ipt_ptr; /* index of current entry */
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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u_int32_t ipt_flg:4, /* flags, see below */
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ipt_oflw:4; /* overflow counter */
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#endif
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#if _BYTE_ORDER == _BIG_ENDIAN
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u_int32_t ipt_oflw:4, /* overflow counter */
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ipt_flg:4; /* flags, see below */
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#endif
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union ipt_timestamp {
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n_time ipt_time[1];
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struct ipt_ta {
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struct in_addr ipt_addr;
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n_time ipt_time;
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} ipt_ta[1];
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} ipt_timestamp;
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};
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/* flag bits for ipt_flg */
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#define IPOPT_TS_TSONLY 0 /* timestamps only */
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#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
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#define IPOPT_TS_PRESPEC 3 /* specified modules only */
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/* bits for security (not byte swapped) */
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#define IPOPT_SECUR_UNCLASS 0x0000
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#define IPOPT_SECUR_CONFID 0xf135
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#define IPOPT_SECUR_EFTO 0x789a
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#define IPOPT_SECUR_MMMM 0xbc4d
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#define IPOPT_SECUR_RESTR 0xaf13
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#define IPOPT_SECUR_SECRET 0xd788
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#define IPOPT_SECUR_TOPSECRET 0x6bc5
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/*
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* Internet implementation parameters.
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*/
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#define MAXTTL 255 /* maximum time to live (seconds) */
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#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
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#define IPFRAGTTL 60 /* time to live for frags, slowhz */
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#define IPTTLDEC 1 /* subtracted when forwarding */
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#define IP_MSS 576 /* default maximum segment size */
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/*
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* This is the real IPv4 pseudo header, used for computing the TCP and UDP
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* checksums. For the Internet checksum, struct ipovly can be used instead.
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* For stronger checksums, the real thing must be used.
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*/
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struct ippseudo {
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struct in_addr ippseudo_src; /* source internet address */
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struct in_addr ippseudo_dst; /* destination internet address */
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u_int8_t ippseudo_pad; /* pad, must be zero */
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u_int8_t ippseudo_p; /* protocol */
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u_int16_t ippseudo_len; /* protocol length */
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};
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/* BIONIC addition: declarations matching the Linux kernel */
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/* some programs expect these... */
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#define IPOPT_OPTVAL 0
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#define IPOPT_OLEN 1
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#define IPOPT_OFFSET 2
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#define IPOPT_MINOFF 4
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#define MAX_IPOPTLEN 40
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#define IPOPT_COPY 0x80
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#define IPOPT_CLASS_MASK 0x60
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#define IPOPT_NUMBER_MASK 0x1f
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#define IPOPT_CONTROL 0x00
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#define IPOPT_RESERVED1 0x20
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#define IPOPT_MEASUREMENT 0x40
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#define IPOPT_RESERVED2 0x60
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#define IPOPT_END (0 |IPOPT_CONTROL)
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#define IPOPT_NOOP (1 |IPOPT_CONTROL)
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#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
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#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
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struct iphdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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uint8_t ihl :4,
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version:4;
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#elif defined (__BIG_ENDIAN_BITFIELD)
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uint8_t version:4,
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ihl :4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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uint8_t tos;
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uint16_t tot_len;
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uint16_t id;
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uint16_t frag_off;
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uint8_t ttl;
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uint8_t protocol;
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uint16_t check;
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int32_t saddr;
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int32_t daddr;
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};
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struct ip_auth_hdr {
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uint8_t nexthdr;
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uint8_t hdrlen;
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uint16_t reserved;
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uint32_t spi;
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uint32_t seq_no;
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uint8_t auth_data[0];
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};
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struct ip_esp_hdr {
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uint32_t spi;
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uint32_t seq_no;
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uint8_t enc_data[0];
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};
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struct ip_comp_hdr {
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uint8_t nexthdr;
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uint8_t flags;
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uint16_t cpi;
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};
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__END_DECLS
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#endif /* _NETINET_IP_H_ */
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