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- /* @(#)ip.h 1.13 88/08/19 SMI; from UCB 7.6.1.1 3/15/88 */
-
- /*
- * 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
-
- #define IPVERSION 4
- #define mc68000 1
-
- /*
- * 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 defined(vax) || defined(i386)
- u_char ip_hl:4, /* header length */
- ip_v:4; /* version */
- #endif
- #if defined(mc68000) || defined(sparc)
- u_char ip_v:4; /* version */
- u_char ip_hl:4; /* header length */
- #endif
- u_char ip_tos; /* type of service */
- u_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 */
- };
-
- #define IP_MAXPACKET 65535 /* maximum packet size */
-
- /*
- * 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.
- */
- #ifdef IP_TIME
-
- 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 defined(vax) || defined(i386)
- u_char ipt_flg:4, /* flags, see below */
- ipt_oflw:4; /* overflow counter */
- #endif
- #if defined(mc68000) || defined(sparc)
- u_short ipt_oflw:4; /* overflow counter */
- u_short 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;
- };
-
- #endif
-
- /* 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 */
-
- #endif /*!_netinet_ip_h*/
-