/*
 * Copyright (c) 1985, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)in_var.h	7.9 (Berkeley) 06/04/93
 */

/*
 * Interface address, Internet version.  One of these structures
 * is allocated for each interface with an Internet address.
 * The ifaddr structure contains the protocol-independent part
 * of the structure and is assumed to be first.
 */
struct in_ifaddr {
	struct	ifaddr ia_ifa;		/* protocol-independent info */
#define	ia_ifp		ia_ifa.ifa_ifp
#define ia_flags	ia_ifa.ifa_flags
					/* ia_{,sub}net{,mask} in host order */
	u_long	ia_net;			/* network number of interface */
	u_long	ia_netmask;		/* mask of net part */
	u_long	ia_subnet;		/* subnet number, including net */
	u_long	ia_subnetmask;		/* mask of subnet part */
	struct	in_addr ia_netbroadcast; /* to recognize net broadcasts */
	struct	in_ifaddr *ia_next;	/* next in list of internet addresses */
	struct	sockaddr_in ia_addr;	/* reserve space for interface name */
	struct	sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
#define	ia_broadaddr	ia_dstaddr
	struct	sockaddr_in ia_sockmask; /* reserve space for general netmask */
	struct	in_multi *ia_multiaddrs; /* list of multicast addresses */
};

struct	in_aliasreq {
	char	ifra_name[IFNAMSIZ];		/* if name, e.g. "en0" */
	struct	sockaddr_in ifra_addr;
	struct	sockaddr_in ifra_broadaddr;
#define ifra_dstaddr ifra_broadaddr
	struct	sockaddr_in ifra_mask;
};
/*
 * Given a pointer to an in_ifaddr (ifaddr),
 * return a pointer to the addr as a sockaddr_in.
 */
#define	IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))

#define IN_LNAOF(in, ifa) \
	((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
			

#ifdef	KERNEL
extern	struct	in_ifaddr *in_ifaddr;
extern	struct	ifqueue	ipintrq;		/* ip packet input queue */
void	in_socktrim __P((struct sockaddr_in *));


/*
 * Macro for finding the interface (ifnet structure) corresponding to one
 * of our IP addresses.
 */
#define INADDR_TO_IFP(addr, ifp) \
	/* struct in_addr addr; */ \
	/* struct ifnet *ifp; */ \
{ \
	register struct in_ifaddr *ia; \
\
	for (ia = in_ifaddr; \
	    ia != NULL && IA_SIN(ia)->sin_addr.s_addr != (addr).s_addr; \
	    ia = ia->ia_next) \
		 continue; \
	(ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
}

/*
 * Macro for finding the internet address structure (in_ifaddr) corresponding
 * to a given interface (ifnet structure).
 */
#define IFP_TO_IA(ifp, ia) \
	/* struct ifnet *ifp; */ \
	/* struct in_ifaddr *ia; */ \
{ \
	for ((ia) = in_ifaddr; \
	    (ia) != NULL && (ia)->ia_ifp != (ifp); \
	    (ia) = (ia)->ia_next) \
		continue; \
}
#endif

/*
 * Internet multicast address structure.  There is one of these for each IP
 * multicast group to which this host belongs on a given network interface.
 * They are kept in a linked list, rooted in the interface's in_ifaddr
 * structure.
 */
struct in_multi {
	struct	in_addr inm_addr;	/* IP multicast address */
	struct	ifnet *inm_ifp;		/* back pointer to ifnet */
	struct	in_ifaddr *inm_ia;	/* back pointer to in_ifaddr */
	u_int	inm_refcount;		/* no. membership claims by sockets */
	u_int	inm_timer;		/* IGMP membership report timer */
	struct	in_multi *inm_next;	/* ptr to next multicast address */
};

#ifdef KERNEL
/*
 * Structure used by macros below to remember position when stepping through
 * all of the in_multi records.
 */
struct in_multistep {
	struct in_ifaddr *i_ia;
	struct in_multi *i_inm;
};

/*
 * Macro for looking up the in_multi record for a given IP multicast address
 * on a given interface.  If no matching record is found, "inm" returns NULL.
 */
#define IN_LOOKUP_MULTI(addr, ifp, inm) \
	/* struct in_addr addr; */ \
	/* struct ifnet *ifp; */ \
	/* struct in_multi *inm; */ \
{ \
	register struct in_ifaddr *ia; \
\
	IFP_TO_IA((ifp), ia); \
	if (ia == NULL) \
		(inm) = NULL; \
	else \
		for ((inm) = ia->ia_multiaddrs; \
		    (inm) != NULL && (inm)->inm_addr.s_addr != (addr).s_addr; \
		     (inm) = inm->inm_next) \
			 continue; \
}

/*
 * Macro to step through all of the in_multi records, one at a time.
 * The current position is remembered in "step", which the caller must
 * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 * and get the first record.  Both macros return a NULL "inm" when there
 * are no remaining records.
 */
#define IN_NEXT_MULTI(step, inm) \
	/* struct in_multistep  step; */ \
	/* struct in_multi *inm; */ \
{ \
	if (((inm) = (step).i_inm) != NULL) \
		(step).i_inm = (inm)->inm_next; \
	else \
		while ((step).i_ia != NULL) { \
			(inm) = (step).i_ia->ia_multiaddrs; \
			(step).i_ia = (step).i_ia->ia_next; \
			if ((inm) != NULL) { \
				(step).i_inm = (inm)->inm_next; \
				break; \
			} \
		} \
}

#define IN_FIRST_MULTI(step, inm) \
	/* struct in_multistep step; */ \
	/* struct in_multi *inm; */ \
{ \
	(step).i_ia = in_ifaddr; \
	(step).i_inm = NULL; \
	IN_NEXT_MULTI((step), (inm)); \
}

int	in_ifinit __P((struct ifnet *,
	    struct in_ifaddr *, struct sockaddr_in *, int));
struct	in_multi *in_addmulti __P((struct in_addr *, struct ifnet *));
int	in_delmulti __P((struct in_multi *));
void	in_ifscrub __P((struct ifnet *, struct in_ifaddr *));
int	in_control __P((struct socket *, int, caddr_t, struct ifnet *));
#endif