/*
 * 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 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.
 *
 *	@(#)ns.h	7.4 (Berkeley) 6/29/88
 */

/*
 * Constants and Structures defined by the Xerox Network Software
 * per "Internet Transport Protocols", XSIS 028112, December 1981
 */

/*
 * Protocols
 */
#define NSPROTO_RI	1		/* Routing Information */
#define NSPROTO_ECHO	2		/* Echo Protocol */
#define NSPROTO_ERROR	3		/* Error Protocol */
#define NSPROTO_PE	4		/* Packet Exchange */
#define NSPROTO_SPP	5		/* Sequenced Packet */
#define NSPROTO_RAW	255		/* Placemarker*/
#define NSPROTO_MAX	256		/* Placemarker*/


/*
 * Port/Socket numbers: network standard functions
 */

#define NSPORT_RI	1		/* Routing Information */
#define NSPORT_ECHO	2		/* Echo */
#define NSPORT_RE	3		/* Router Error */

/*
 * Ports < NSPORT_RESERVED are reserved for priveleged
 * processes (e.g. root).
 */
#define NSPORT_RESERVED		3000

/* flags passed to ns_output as last parameter */

#define	NS_FORWARDING		0x1	/* most of idp header exists */
#define	NS_ROUTETOIF		0x10	/* same as SO_DONTROUTE */
#define	NS_ALLOWBROADCAST	SO_BROADCAST	/* can send broadcast packets */

#define NS_MAXHOPS		15

/* flags passed to get/set socket option */
#define	SO_HEADERS_ON_INPUT	1
#define	SO_HEADERS_ON_OUTPUT	2
#define	SO_DEFAULT_HEADERS	3
#define	SO_LAST_HEADER		4
#define	SO_NSIP_ROUTE		5
#define SO_SEQNO		6
#define	SO_ALL_PACKETS		7
#define SO_MTU			8


/*
 * NS addressing
 */
union ns_host {
	u_char	c_host[6];
	u_short	s_host[3];
};

union ns_net {
	u_char	c_net[4];
	u_short	s_net[2];
};

union ns_net_u {
	union ns_net	net_e;
	u_long		long_e;
};

struct ns_addr {
	union ns_net	x_net;
	union ns_host	x_host;
	u_short	x_port;
};

/*
 * Socket address, Xerox style
 */
struct sockaddr_ns {
	u_short		sns_family;
	struct ns_addr	sns_addr;
	char		sns_zero[2];
};
#define sns_port sns_addr.x_port

#ifdef vax
#define ns_netof(a) (*(long *) & ((a).x_net)) /* XXX - not needed */
#endif
#define ns_neteqnn(a,b) (((a).s_net[0]==(b).s_net[0]) && \
					((a).s_net[1]==(b).s_net[1]))
#define ns_neteq(a,b) ns_neteqnn((a).x_net, (b).x_net)
#define satons_addr(sa)	(((struct sockaddr_ns *)&(sa))->sns_addr)
#define ns_hosteqnh(s,t) ((s).s_host[0] == (t).s_host[0] && \
	(s).s_host[1] == (t).s_host[1] && (s).s_host[2] == (t).s_host[2])
#define ns_hosteq(s,t) (ns_hosteqnh((s).x_host,(t).x_host))
#define ns_nullhost(x) (((x).x_host.s_host[0]==0) && \
	((x).x_host.s_host[1]==0) && ((x).x_host.s_host[2]==0))

#ifdef KERNEL
extern struct domain nsdomain;
union ns_host ns_thishost;
union ns_host ns_zerohost;
union ns_host ns_broadhost;
union ns_net ns_zeronet;
union ns_net ns_broadnet;
u_short ns_cksum();
#endif
