/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

/*
 * Definitions for internet protocol version 4.
 * Per RFC 791, September 1981.
 */

#ifndef _NETINET_IP_H
#define _NETINET_IP_H

/* ip.h 1.13 88/08/19 SMI; from UCB 7.6.1.1 3/15/88     */

#include <sys/isa_defs.h>

#ifdef  __cplusplus
extern "C" {
#endif

#define IPVERSION       4

/*
 * Structure of an internet header, naked of options.
 */
struct ip {
#ifdef _BIT_FIELDS_LTOH
        uchar_t ip_hl:4,                /* header length */
                ip_v:4;                 /* version */
#else
        uchar_t ip_v:4,                 /* version */
                ip_hl:4;                /* header length */
#endif
        uchar_t ip_tos;                 /* type of service */
        ushort_t ip_len;                /* total length */
        ushort_t ip_id;                 /* identification */
        ushort_t ip_off;                /* fragment offset field */
#define IP_DF 0x4000                    /* dont fragment flag */
#define IP_MF 0x2000                    /* more fragments flag */
        uchar_t ip_ttl;                 /* time to live */
        uchar_t ip_p;                   /* protocol */
        ushort_t ip_sum;                /* checksum */
        struct  in_addr ip_src, ip_dst; /* source and dest address */
};

#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
#define IPTOS_ECT               0x02    /* ECN-Capable Transport flag */
#define IPTOS_CE                0x01    /* ECN-Congestion Experienced flag */

/*
 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 */
#define IPTOS_PREC_NETCONTROL           0xe0
#define IPTOS_PREC_INTERNETCONTROL      0xc0
#define IPTOS_PREC_CRITIC_ECP           0xa0
#define IPTOS_PREC_FLASHOVERRIDE        0x80
#define IPTOS_PREC_FLASH                0x60
#define IPTOS_PREC_IMMEDIATE            0x40
#define IPTOS_PREC_PRIORITY             0x20
#define IPTOS_PREC_ROUTINE              0x00

/*
 * Definitions for options.
 */

/* Bits in the option value */
#define IPOPT_COPY              0x80

#define IPOPT_COPIED(o)         ((o)&0x80)
#define IPOPT_CLASS(o)          ((o)&0x60)
#define IPOPT_NUMBER(o)         ((o)&0x1f)

#define IPOPT_CONTROL           0x00
#define IPOPT_RESERVED1         0x20
#define IPOPT_DEBMEAS           0x40
#define IPOPT_RESERVED2         0x60

#define IPOPT_EOL               0x00            /* end of option list */
#define IPOPT_NOP               0x01            /* no operation */

#define IPOPT_RR                0x07            /* record packet route */
#define IPOPT_RTRALERT          0x14            /* router alert */
#define IPOPT_TS                0x44            /* timestamp */
#define IPOPT_SECURITY          0x82            /* provide s,c,h,tcc */
#define IPOPT_LSRR              0x83            /* loose source route */
#define IPOPT_EXTSEC            0x85
#define IPOPT_COMSEC            0x86
#define IPOPT_SATID             0x88            /* satnet id */
#define IPOPT_SSRR              0x89            /* strict source route */
#define IPOPT_RA                0x94
#define IPOPT_SDMDD             0x95

/*
 * Offsets to fields in options other than EOL and NOP.
 */
#define IPOPT_OPTVAL            0               /* option ID */
#define IPOPT_OLEN              1               /* option length */
#define IPOPT_OFFSET            2               /* offset within option */
#define IPOPT_POS_OV_FLG        3
#define IPOPT_MINOFF            4               /* min value of IPOPT_OFFSET */


/* Minimum for src and record route options */
#define IPOPT_MINOFF_SR         IPOPT_MINOFF

/*
 * Time stamp option structure.
 */
struct  ip_timestamp {
        uchar_t ipt_code;               /* IPOPT_TS */
        uchar_t ipt_len;                /* size of structure (variable) */
        uchar_t ipt_ptr;                /* index of current entry */
#ifdef _BIT_FIELDS_LTOH
        uchar_t ipt_flg:4,              /* flags, see below */
                ipt_oflw:4;             /* overflow counter */
#else
        uchar_t ipt_oflw:4,             /* overflow counter */
                ipt_flg:4;              /* flags, see below */
#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;
};

/* flag bits for ipt_flg */
#define IPOPT_TS_TSONLY         0               /* timestamps only */
#define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
#define IPOPT_TS_PRESPEC        2               /* specified modules only */
#define IPOPT_TS_PRESPEC_RFC791 3

/* Minimum for timestamp option */
#define IPOPT_MINOFF_IT         5
#define IPOPT_MINLEN_IT         5

#define IPOPT_TS_TIMELEN        4       /* Timestamp size */

/* bits for security (not byte swapped) */
#define IPOPT_SECUR_UNCLASS     0x0000
#define IPOPT_SECUR_CONFID      0xf135
#define IPOPT_SECUR_EFTO        0x789a
#define IPOPT_SECUR_MMMM        0xbc4d
#define IPOPT_SECUR_RESTR       0xaf13
#define IPOPT_SECUR_SECRET      0xd788
#define IPOPT_SECUR_TOPSECRET   0x6bc5

/*
 * Internet implementation parameters.
 */
#define MAXTTL          255             /* maximum time to live (seconds) */
#define IPFRAGTTL       60              /* time to live for frags, slowhz */
#define IPTTLDEC        1               /* subtracted when forwarding */

#define IP_MSS          576             /* default maximum segment size */

#ifdef  __cplusplus
}
#endif

#endif  /* _NETINET_IP_H */