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- /*
- * 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 the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, 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'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- *
- * @(#)ip.h 7.6.1.3 (Berkeley) 2/20/89
- */
- #ifndef BYTE_ORDER
- /*
- * Definitions for byte order,
- * according to byte significance from low address to high.
- */
- #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 vax
- #define BYTE_ORDER LITTLE_ENDIAN
- #else
- #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */
- #endif
- #endif BYTE_ORDER
-
- /*
- * 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 {
- #ifdef LATTICE
- int ip_v:4; /* version */
- int ip_hl:4; /* header length */
- int ip_tos:8; /* type of service */
- int ip_len:16; /* length */
- #elif AZTEC_C /* conviently just the opposite of Lattice */
- int ip_len :16;
- int ip_tos :8; /* type of service */
- int ip_hl :4; /* header length */
- int ip_v :4; /* version */
- #else
- short ip_tos:8, /* type of service */
- ip_hl:4, /* header length */
- ip_v:4; /* version */
- short ip_len; /* total length */
- #endif /* LATTICE */
- 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.
- */
- 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
- u_int ipt_flg:4, /* flags, see below */
- ipt_oflw:4; /* overflow counter */
- #endif
- #if BYTE_ORDER == BIG_ENDIAN
- u_int 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 3 /* 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 */
-