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ip.h
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1999-05-11
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8KB
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183 lines
#ifndef __IP_32H
#define __IP_32H
/*
* 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.
*
* @(#)ip.h 7.6.1.1 (Berkeley) 3/15/88
*/
#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */
#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
#ifdef OS2
#define BYTE_ORDER LITTLE_ENDIAN
#else
#ifndef BYTE_ORDER
/*
* Definitions for byte order,
* according to byte significance from low address to high.
*/
#ifdef vax
#define BYTE_ORDER LITTLE_ENDIAN
#else
#define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */
#endif
#endif
#endif
/*
* Definitions for internet protocol version 4.
* Per RFC 791, September 1981.
*/
#define IPVERSION 4
/*
* Structure of an internet header, naked of options.
*
* We declare ip_len and ip_off to be short, rather than u_short
* pragmatically since otherwise unsigned comparisons can result
* against negative integers quite easily, and fail in subtle ways.
*/
struct ip {
#if BYTE_ORDER == LITTLE_ENDIAN
int ip_hl:4, /* header length */
ip_v:4; /* version */
#endif
#if BYTE_ORDER == BIG_ENDIAN
u_char ip_v:4, /* version */
ip_hl:4; /* header length */
#endif
u_char ip_tos; /* type of service */
short ip_len; /* total length */
u_short ip_id; /* identification */
short ip_off; /* fragment offset field */
#define IP_DF 0x4000 /* dont fragment flag */
#define IP_MF 0x2000 /* more fragments flag */
u_char ip_ttl; /* time to live */
u_char ip_p; /* protocol */
u_short ip_sum; /* checksum */
struct in_addr ip_src,ip_dst; /* source and dest address */
};
#ifndef OS2
#define IP_MAXPACKET 65535 /* maximum packet size */
#else
#define IP_MAXPACKET 32767 /* maximum packet size */
#endif
/*
* Definitions for options.
*/
#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 0 /* end of option list */
#define IPOPT_NOP 1 /* no operation */
#define IPOPT_RR 7 /* record packet route */
#define IPOPT_TS 68 /* timestamp */
#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
#define IPOPT_LSRR 131 /* loose source route */
#define IPOPT_SATID 136 /* satnet id */
#define IPOPT_SSRR 137 /* strict source route */
/*
* 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_MINOFF 4 /* min value of above */
/*
* Time stamp option structure.
*/
struct ip_timestamp {
u_char ipt_code; /* IPOPT_TS */
u_char ipt_len; /* size of structure (variable) */
u_char ipt_ptr; /* index of current entry */
#if BYTE_ORDER == LITTLE_ENDIAN
int ipt_flg:4, /* flags, see below */
ipt_oflw:4; /* overflow counter */
#endif
#if BYTE_ORDER == BIG_ENDIAN
u_char ipt_oflw:4, /* overflow counter */
ipt_flg:4; /* flags, see below */
#endif
union ipt_timestamp {
n_long ipt_time[1];
struct ipt_ta {
struct in_addr ipt_addr;
n_long 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 */
/* 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 */
#pragma pack(1)
struct ipstat {
long ips_total; /* total packets received */
long ips_badsum; /* checksum bad */
long ips_tooshort; /* packet too short */
long ips_toosmall; /* not enough data */
long ips_badhlen; /* ip header length < data size */
long ips_badlen; /* ip length < ip header length */
long ips_fragments; /* fragments received */
long ips_fragdropped; /* frags dropped (dups, out of space) */
long ips_fragtimeout; /* fragments timed out */
long ips_forward; /* packets forwarded */
long ips_cantforward; /* packets rcvd for unreachable dest */
long ips_redirectsent; /* packets forwarded on same net */
long ips_ipOutRequests; /* requested for transmission */
long ips_ipOutNoRoutes; /* discarded - no route */
long ips_ipFragFails; /* had to fragment but could not */
long ips_ipFragOKs; /* successfully fragmented datagrams */
long ips_ipFragCreates; /* number of fragments created */
long ips_ipReasmOKs; /* datagrams successfully assembled */
long ips_ipOutDiscards; /* discarded due to lack of space */
long ips_ipInDiscards; /* discarded due to lack of space 0 */
long ips_ipInAddrErrors; /* discarded due to lack of space 0 */
long ips_ipInDelivers; /* datagrams successfully delivered */
long ips_ipInUnknownProtos; /* datagrams with unknown protocol */
};
#pragma pack()
#endif /* __IP_32H */