/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution is only permitted until one year after the first shipment
 * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
 * binary forms are permitted provided that: (1) source distributions retain
 * this entire copyright notice and comment, and (2) distributions including
 * binaries display the following acknowledgement:  This product includes
 * software developed by the University of California, Berkeley and its
 * contributors'' in the documentation or other materials provided with the
 * distribution and in all advertising materials mentioning features or use
 * of this software.  Neither the name of the University nor the names of
 * its contributors may 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
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)ip_var.h	7.7 (Berkeley) 6/28/90 plus MULTICAST 1.0
 */

/*
 * Overlay for ip header used by other protocols (tcp, udp).
 */
struct ipovly {
	caddr_t	ih_next, ih_prev;	/* for protocol sequence q's */
	u_char	ih_x1;			/* (unused) */
	u_char	ih_pr;			/* protocol */
	u_short	ih_len;			/* protocol length */
	struct	in_addr ih_src;		/* source internet address */
	struct	in_addr ih_dst;		/* destination internet address */
};

/*
 * Ip reassembly queue structure.  Each fragment
 * being reassembled is attached to one of these structures.
 * They are timed out after ipq_ttl drops to 0, and may also
 * be reclaimed if memory becomes tight.
 */
struct ipq {
	struct	ipq *next,*prev;	/* to other reass headers */
	u_char	ipq_ttl;		/* time for reass q to live */
	u_char	ipq_p;			/* protocol of this fragment */
	u_short	ipq_id;			/* sequence id for reassembly */
	struct	ipasfrag *ipq_next,*ipq_prev;
					/* to ip headers of fragments */
	struct	in_addr ipq_src,ipq_dst;
#ifdef __sgi
	struct 	mbuf *ipq_mbuf;		/* back pointer to mbuf header */
#endif
};

/*
 * Ip header, when holding a fragment.
 *
 * Note: ipf_next must be at same offset as ipq_next above
 */
struct	ipasfrag {
#if BYTE_ORDER == LITTLE_ENDIAN 
	u_char	ip_hl:4,
		ip_v:4;
#endif
#if BYTE_ORDER !=  LITTLE_ENDIAN
	u_char	ip_v:4,
		ip_hl:4;
#endif
	u_char	ipf_mff;		/* copied from (ip_off&IP_MF) */
	u_short	ip_len;
	u_short	ip_id;
	u_short	ip_off;
	u_char	ip_ttl;
	u_char	ip_p;
	u_short	ip_sum;
	struct	ipasfrag *ipf_next;	/* next fragment */
	struct	ipasfrag *ipf_prev;	/* previous fragment */
};

/*
 * Structure stored in mbuf in inpcb.ip_options
 * and passed to ip_output when ip options are in use.
 * The actual length of the options (including ipopt_dst)
 * is in m_len.
 */
#define MAX_IPOPTLEN	40

struct ipoption {
	struct	in_addr ipopt_dst;	/* first-hop dst if source routed */
	char	ipopt_list[MAX_IPOPTLEN];	/* options proper */
};

#ifdef __sgi /* MULTICAST */
/*
 * Structure stored in an mbuf attached to inpcb.ip_moptions and
 * passed to ip_output when IP multicast options are in use.
 */
struct ip_moptions {
	struct	ifnet   *imo_multicast_ifp;  /* ifp for outgoing multicasts */
	u_char	         imo_multicast_ttl;  /* TTL for outgoing multicasts */
	u_char		 imo_multicast_loop; /* 1 => hear sends if a member */
	u_short		 imo_num_memberships;/* no. memberships this socket */
	struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
};
#endif /* __sgi */

/*
 * SGI: The statistics formerly in this file are now in sys/tcpipstats.h
 */
#ifdef _KERNEL

#ifdef _MP_NETLOCKS
#include "sys/sema.h"
extern	lock_t	ipfrag_lock;
#define IPFRAG_INITLOCK()	initnlock(&ipfrag_lock, "ipfraglk")
#define IPFRAG_LOCK()		spsema(ipfrag_lock)
#define IPFRAG_UNLOCK()		svsema(ipfrag_lock)
#define IPFRAGLOCK_ISLOCKED()	(ownlock(ipfrag_lock))
#else
#define IPFRAG_INITLOCK()	
#define IPFRAG_LOCK()
#define IPFRAG_UNLOCK()
#define IPFRAGLOCK_ISLOCKED()	(1)
#endif /* _MP_NETLOCKS */

/* flags passed to ip_output as last parameter */
#define	IP_FORWARDING		0x1		/* most of ip header exists */
#ifdef __sgi /* MULTICAST */
#define IP_MULTICASTOPTS	0x2		/* multicast opts present */
#endif
#define	IP_ROUTETOIF		SO_DONTROUTE	/* bypass routing tables */
#define	IP_ALLOWBROADCAST	SO_BROADCAST	/* can send broadcast packets */

extern struct	ipq	ipq;			/* ip reass. queue */
extern u_short	ip_id;				/* ip packet ctr, for ids */

struct route;
struct socket;

extern	struct mbuf *ip_srcroute(void);
extern	int ip_pcbopts(struct mbuf **, struct mbuf *);
extern	int ip_freemoptions(struct mbuf *);
extern	int ip_getmoptions(int, struct mbuf *, struct mbuf **);
extern	int ip_setmoptions(int, struct mbuf **, struct mbuf *);
extern	void ip_stripoptions( struct mbuf *, struct mbuf *);

extern	int ip_ctloutput(int, struct socket *, int, int, struct mbuf **);

#ifdef CIPSO
struct mac_label;
extern	ip_output(struct mbuf *, struct mbuf *, struct route *, int,
		  struct mbuf *, struct mac_label *, uid_t);
#else
extern	ip_output(struct mbuf *, struct mbuf *, struct route *, int,
		  struct mbuf *);
#endif

#endif