2.11BSD/sys/netns/idp.h

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/*
 * Copyright (c) 1984, 1985, 1986, 1987 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.
 *
 *      @(#)idp.h	7.2 (Berkeley) 1/20/88
 */

/*
 * Definitions for NS(tm) Internet Datagram Protocol
 */
struct idp {
	u_short	idp_sum;	/* Checksum */
	u_short	idp_len;	/* Length, in bytes, including header */
	u_char	idp_tc;		/* Transport Crontrol (i.e. hop count) */
	u_char	idp_pt;		/* Packet Type (i.e. level 2 protocol) */
	struct ns_addr	idp_dna;	/* Destination Network Address */
	struct ns_addr	idp_sna;	/* Source Network Address */
};