Home | History | Annotate | Line # | Download | only in netinet
ip.h revision 1.3
      1 /*
      2  * Copyright (c) 1982, 1986 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	from: @(#)ip.h	7.10 (Berkeley) 6/28/90
     34  *	$Id: ip.h,v 1.3 1993/05/20 03:50:15 cgd Exp $
     35  */
     36 
     37 #ifndef _NETINET_IP_H_
     38 #define _NETINET_IP_H_
     39 
     40 /*
     41  * Definitions for internet protocol version 4.
     42  * Per RFC 791, September 1981.
     43  */
     44 #define	IPVERSION	4
     45 
     46 /*
     47  * Structure of an internet header, naked of options.
     48  *
     49  * We declare ip_len and ip_off to be short, rather than u_short
     50  * pragmatically since otherwise unsigned comparisons can result
     51  * against negative integers quite easily, and fail in subtle ways.
     52  */
     53 struct ip {
     54 #if BYTE_ORDER == LITTLE_ENDIAN
     55 	u_char	ip_hl:4,		/* header length */
     56 		ip_v:4;			/* version */
     57 #endif
     58 #if BYTE_ORDER == BIG_ENDIAN
     59 	u_char	ip_v:4,			/* version */
     60 		ip_hl:4;		/* header length */
     61 #endif
     62 	u_char	ip_tos;			/* type of service */
     63 	short	ip_len;			/* total length */
     64 	u_short	ip_id;			/* identification */
     65 	short	ip_off;			/* fragment offset field */
     66 #define	IP_DF 0x4000			/* dont fragment flag */
     67 #define	IP_MF 0x2000			/* more fragments flag */
     68 	u_char	ip_ttl;			/* time to live */
     69 	u_char	ip_p;			/* protocol */
     70 	u_short	ip_sum;			/* checksum */
     71 	struct	in_addr ip_src,ip_dst;	/* source and dest address */
     72 };
     73 
     74 #define	IP_MAXPACKET	65535		/* maximum packet size */
     75 
     76 /*
     77  * Definitions for IP type of service (ip_tos)
     78  */
     79 #define	IPTOS_LOWDELAY		0x10
     80 #define	IPTOS_THROUGHPUT	0x08
     81 #define	IPTOS_RELIABILITY	0x04
     82 
     83 /*
     84  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
     85  */
     86 #define	IPTOS_PREC_NETCONTROL		0xe0
     87 #define	IPTOS_PREC_INTERNETCONTROL	0xc0
     88 #define	IPTOS_PREC_CRITIC_ECP		0xa0
     89 #define	IPTOS_PREC_FLASHOVERRIDE	0x80
     90 #define	IPTOS_PREC_FLASH		0x60
     91 #define	IPTOS_PREC_IMMEDIATE		0x40
     92 #define	IPTOS_PREC_PRIORITY		0x20
     93 #define	IPTOS_PREC_ROUTINE		0x10
     94 
     95 /*
     96  * Definitions for options.
     97  */
     98 #define	IPOPT_COPIED(o)		((o)&0x80)
     99 #define	IPOPT_CLASS(o)		((o)&0x60)
    100 #define	IPOPT_NUMBER(o)		((o)&0x1f)
    101 
    102 #define	IPOPT_CONTROL		0x00
    103 #define	IPOPT_RESERVED1		0x20
    104 #define	IPOPT_DEBMEAS		0x40
    105 #define	IPOPT_RESERVED2		0x60
    106 
    107 #define	IPOPT_EOL		0		/* end of option list */
    108 #define	IPOPT_NOP		1		/* no operation */
    109 
    110 #define	IPOPT_RR		7		/* record packet route */
    111 #define	IPOPT_TS		68		/* timestamp */
    112 #define	IPOPT_SECURITY		130		/* provide s,c,h,tcc */
    113 #define	IPOPT_LSRR		131		/* loose source route */
    114 #define	IPOPT_SATID		136		/* satnet id */
    115 #define	IPOPT_SSRR		137		/* strict source route */
    116 
    117 /*
    118  * Offsets to fields in options other than EOL and NOP.
    119  */
    120 #define	IPOPT_OPTVAL		0		/* option ID */
    121 #define	IPOPT_OLEN		1		/* option length */
    122 #define IPOPT_OFFSET		2		/* offset within option */
    123 #define	IPOPT_MINOFF		4		/* min value of above */
    124 
    125 /*
    126  * Time stamp option structure.
    127  */
    128 struct	ip_timestamp {
    129 	u_char	ipt_code;		/* IPOPT_TS */
    130 	u_char	ipt_len;		/* size of structure (variable) */
    131 	u_char	ipt_ptr;		/* index of current entry */
    132 #if BYTE_ORDER == LITTLE_ENDIAN
    133 	u_char	ipt_flg:4,		/* flags, see below */
    134 		ipt_oflw:4;		/* overflow counter */
    135 #endif
    136 #if BYTE_ORDER == BIG_ENDIAN
    137 	u_char	ipt_oflw:4,		/* overflow counter */
    138 		ipt_flg:4;		/* flags, see below */
    139 #endif
    140 	union ipt_timestamp {
    141 		n_long	ipt_time[1];
    142 		struct	ipt_ta {
    143 			struct in_addr ipt_addr;
    144 			n_long ipt_time;
    145 		} ipt_ta[1];
    146 	} ipt_timestamp;
    147 };
    148 
    149 /* flag bits for ipt_flg */
    150 #define	IPOPT_TS_TSONLY		0		/* timestamps only */
    151 #define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
    152 #define	IPOPT_TS_PRESPEC	3		/* specified modules only */
    153 
    154 /* bits for security (not byte swapped) */
    155 #define	IPOPT_SECUR_UNCLASS	0x0000
    156 #define	IPOPT_SECUR_CONFID	0xf135
    157 #define	IPOPT_SECUR_EFTO	0x789a
    158 #define	IPOPT_SECUR_MMMM	0xbc4d
    159 #define	IPOPT_SECUR_RESTR	0xaf13
    160 #define	IPOPT_SECUR_SECRET	0xd788
    161 #define	IPOPT_SECUR_TOPSECRET	0x6bc5
    162 
    163 /*
    164  * Internet implementation parameters.
    165  */
    166 #define	MAXTTL		255		/* maximum time to live (seconds) */
    167 #define	IPFRAGTTL	60		/* time to live for frags, slowhz */
    168 #define	IPTTLDEC	1		/* subtracted when forwarding */
    169 
    170 #define	IP_MSS		576		/* default maximum segment size */
    171 
    172 #endif /* !_NETINET_IP_H_ */
    173