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      1 /*
      2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 /*
      7  * Copyright (c) 1982, 1986 Regents of the University of California.
      8  * All rights reserved.
      9  *
     10  * Redistribution and use in source and binary forms are permitted
     11  * provided that this notice is preserved and that due credit is given
     12  * to the University of California at Berkeley. The name of the University
     13  * may not be used to endorse or promote products derived from this
     14  * software without specific prior written permission. This software
     15  * is provided ``as is'' without express or implied warranty.
     16  */
     17 
     18 /*
     19  * Definitions for internet protocol version 4.
     20  * Per RFC 791, September 1981.
     21  */
     22 
     23 #ifndef	_NETINET_IP_H
     24 #define	_NETINET_IP_H
     25 
     26 #pragma ident	"@(#)ip.h	1.16	05/06/12 SMI"
     27 /* ip.h 1.13 88/08/19 SMI; from UCB 7.6.1.1 3/15/88	*/
     28 
     29 #include <sys/isa_defs.h>
     30 
     31 #ifdef	__cplusplus
     32 extern "C" {
     33 #endif
     34 
     35 #define	IPVERSION	4
     36 
     37 /*
     38  * Structure of an internet header, naked of options.
     39  */
     40 struct ip {
     41 #ifdef _BIT_FIELDS_LTOH
     42 	uchar_t	ip_hl:4,		/* header length */
     43 		ip_v:4;			/* version */
     44 #else
     45 	uchar_t	ip_v:4,			/* version */
     46 		ip_hl:4;		/* header length */
     47 #endif
     48 	uchar_t	ip_tos;			/* type of service */
     49 	ushort_t ip_len;		/* total length */
     50 	ushort_t ip_id;			/* identification */
     51 	ushort_t ip_off;		/* fragment offset field */
     52 #define	IP_DF 0x4000			/* dont fragment flag */
     53 #define	IP_MF 0x2000			/* more fragments flag */
     54 	uchar_t	ip_ttl;			/* time to live */
     55 	uchar_t	ip_p;			/* protocol */
     56 	ushort_t ip_sum;		/* checksum */
     57 	struct	in_addr ip_src, ip_dst;	/* source and dest address */
     58 };
     59 
     60 #define	IP_MAXPACKET	65535		/* maximum packet size */
     61 
     62 /*
     63  * Definitions for IP type of service (ip_tos)
     64  */
     65 #define	IPTOS_LOWDELAY		0x10
     66 #define	IPTOS_THROUGHPUT	0x08
     67 #define	IPTOS_RELIABILITY	0x04
     68 #define	IPTOS_ECT		0x02	/* ECN-Capable Transport flag */
     69 #define	IPTOS_CE		0x01	/* ECN-Congestion Experienced flag */
     70 
     71 /*
     72  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
     73  */
     74 #define	IPTOS_PREC_NETCONTROL		0xe0
     75 #define	IPTOS_PREC_INTERNETCONTROL	0xc0
     76 #define	IPTOS_PREC_CRITIC_ECP		0xa0
     77 #define	IPTOS_PREC_FLASHOVERRIDE	0x80
     78 #define	IPTOS_PREC_FLASH		0x60
     79 #define	IPTOS_PREC_IMMEDIATE		0x40
     80 #define	IPTOS_PREC_PRIORITY		0x20
     81 #define	IPTOS_PREC_ROUTINE		0x00
     82 
     83 /*
     84  * Definitions for options.
     85  */
     86 
     87 /* Bits in the option value */
     88 #define	IPOPT_COPY		0x80
     89 
     90 #define	IPOPT_COPIED(o)		((o)&0x80)
     91 #define	IPOPT_CLASS(o)		((o)&0x60)
     92 #define	IPOPT_NUMBER(o)		((o)&0x1f)
     93 
     94 #define	IPOPT_CONTROL		0x00
     95 #define	IPOPT_RESERVED1		0x20
     96 #define	IPOPT_DEBMEAS		0x40
     97 #define	IPOPT_RESERVED2		0x60
     98 
     99 #define	IPOPT_EOL		0x00		/* end of option list */
    100 #define	IPOPT_NOP		0x01		/* no operation */
    101 
    102 #define	IPOPT_RR		0x07		/* record packet route */
    103 #define	IPOPT_RTRALERT		0x14		/* router alert */
    104 #define	IPOPT_TS		0x44		/* timestamp */
    105 #define	IPOPT_SECURITY		0x82		/* provide s,c,h,tcc */
    106 #define	IPOPT_LSRR		0x83		/* loose source route */
    107 #define	IPOPT_EXTSEC		0x85
    108 #define	IPOPT_COMSEC		0x86
    109 #define	IPOPT_SATID		0x88		/* satnet id */
    110 #define	IPOPT_SSRR		0x89		/* strict source route */
    111 #define	IPOPT_RA		0x94
    112 #define	IPOPT_SDMDD		0x95
    113 
    114 /*
    115  * Offsets to fields in options other than EOL and NOP.
    116  */
    117 #define	IPOPT_OPTVAL		0		/* option ID */
    118 #define	IPOPT_OLEN		1		/* option length */
    119 #define	IPOPT_OFFSET		2		/* offset within option */
    120 #define	IPOPT_POS_OV_FLG	3
    121 #define	IPOPT_MINOFF		4		/* min value of IPOPT_OFFSET */
    122 
    123 
    124 /* Minimum for src and record route options */
    125 #define	IPOPT_MINOFF_SR		IPOPT_MINOFF
    126 
    127 /*
    128  * Time stamp option structure.
    129  */
    130 struct	ip_timestamp {
    131 	uchar_t	ipt_code;		/* IPOPT_TS */
    132 	uchar_t	ipt_len;		/* size of structure (variable) */
    133 	uchar_t	ipt_ptr;		/* index of current entry */
    134 #ifdef _BIT_FIELDS_LTOH
    135 	uchar_t	ipt_flg:4,		/* flags, see below */
    136 		ipt_oflw:4;		/* overflow counter */
    137 #else
    138 	uchar_t	ipt_oflw:4,		/* overflow counter */
    139 		ipt_flg:4;		/* flags, see below */
    140 #endif
    141 	union ipt_timestamp {
    142 		uint32_t	ipt_time[1];
    143 		struct	ipt_ta {
    144 			struct in_addr	ipt_addr;
    145 			uint32_t	ipt_time;
    146 		} ipt_ta[1];
    147 	} ipt_timestamp;
    148 };
    149 
    150 /* flag bits for ipt_flg */
    151 #define	IPOPT_TS_TSONLY		0		/* timestamps only */
    152 #define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
    153 #define	IPOPT_TS_PRESPEC	2		/* specified modules only */
    154 #define	IPOPT_TS_PRESPEC_RFC791	3
    155 
    156 /* Minimum for timestamp option */
    157 #define	IPOPT_MINOFF_IT		5
    158 #define	IPOPT_MINLEN_IT		5
    159 
    160 #define	IPOPT_TS_TIMELEN	4	/* Timestamp size */
    161 
    162 /* bits for security (not byte swapped) */
    163 #define	IPOPT_SECUR_UNCLASS	0x0000
    164 #define	IPOPT_SECUR_CONFID	0xf135
    165 #define	IPOPT_SECUR_EFTO	0x789a
    166 #define	IPOPT_SECUR_MMMM	0xbc4d
    167 #define	IPOPT_SECUR_RESTR	0xaf13
    168 #define	IPOPT_SECUR_SECRET	0xd788
    169 #define	IPOPT_SECUR_TOPSECRET	0x6bc5
    170 
    171 /*
    172  * Internet implementation parameters.
    173  */
    174 #define	MAXTTL		255		/* maximum time to live (seconds) */
    175 #define	IPFRAGTTL	60		/* time to live for frags, slowhz */
    176 #define	IPTTLDEC	1		/* subtracted when forwarding */
    177 
    178 #define	IP_MSS		576		/* default maximum segment size */
    179 
    180 #ifdef	__cplusplus
    181 }
    182 #endif
    183 
    184 #endif	/* _NETINET_IP_H */
    185