/*	$OpenBSD: in_var.h,v 1.21 2013/08/28 21:19:16 bluhm Exp $	*/
/*	$NetBSD: in_var.h,v 1.16 1996/02/13 23:42:15 christos Exp $	*/

/*
 * Copyright (c) 1985, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)in_var.h	8.1 (Berkeley) 6/10/93
 */

#ifndef _NETINET_IN_VAR_H_
#define _NETINET_IN_VAR_H_

#include <sys/queue.h>

/*
 * 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_net{,mask} in host order */
	u_int32_t ia_net;		/* network number of interface */
	u_int32_t ia_netmask;		/* mask of net part */
	TAILQ_ENTRY(in_ifaddr) ia_list;	/* 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 */
	LIST_HEAD(, in_multi) ia_multiaddrs; /* list of multicast addresses */
	struct  in_multi *ia_allhosts;	/* multicast address record for
					   the allhosts multicast group */
};

struct	in_aliasreq {
	char	ifra_name[IFNAMSIZ];		/* if name, e.g. "en0" */
	union {
		struct	sockaddr_in ifrau_addr;
		int	ifrau_align;
	} ifra_ifrau;
#ifndef ifra_addr
#define ifra_addr	ifra_ifrau.ifrau_addr
#endif
	struct	sockaddr_in ifra_dstaddr;
#define	ifra_broadaddr	ifra_dstaddr
	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))


#ifdef	_KERNEL
TAILQ_HEAD(in_ifaddrhead, in_ifaddr);
extern	struct	in_ifaddrhead in_ifaddr;
extern	struct	ifqueue	ipintrq;		/* ip packet input queue */
extern	int	inetctlerrmap[];
void	in_socktrim(struct sockaddr_in *);


/*
 * Macro for finding the interface (ifnet structure) corresponding to one
 * of our IP addresses.
 */
#define INADDR_TO_IFP(addr, ifp, rtableid)				\
	/* struct in_addr addr; */					\
	/* struct ifnet *ifp; */					\
do {									\
	struct in_ifaddr *ia;						\
									\
	TAILQ_FOREACH(ia, &in_ifaddr, ia_list)				\
		if (ia->ia_ifp->if_rdomain == rtable_l2(rtableid) &&	\
		    ia->ia_addr.sin_addr.s_addr == (addr).s_addr)	\
			 break;						\
	(ifp) = (ia == NULL) ? NULL : ia->ia_ifp;			\
} while (/* CONSTCOND */ 0)

/*
 * 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; */					\
do {									\
	TAILQ_FOREACH((ia), &in_ifaddr, ia_list)			\
		if ((ia)->ia_ifp == (ifp))				\
			break;						\
} while (/* CONSTCOND */ 0)
#endif

/*
 * Per-interface router version information.
 */
struct router_info {
	struct	ifnet *rti_ifp;
	int	rti_type;	/* type of router on this interface */
	int	rti_age;	/* time since last v1 query */
	struct	router_info *rti_next;
};

/*
 * 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	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 */
	LIST_ENTRY(in_multi) inm_list;	/* list of multicast addresses */
	u_int	inm_state;		/* state of membership */
	struct	router_info *inm_rti;	/* router version info */
};

#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; */					\
do {									\
	struct in_ifaddr *ia;						\
									\
	IFP_TO_IA((ifp), ia);						\
	if (ia == NULL)							\
		(inm) = NULL;						\
	else								\
		for ((inm) = LIST_FIRST(&ia->ia_multiaddrs);		\
		     (inm) != NULL &&		\
		      (inm)->inm_addr.s_addr != (addr).s_addr;		\
		     (inm) = LIST_NEXT(inm, inm_list))			\
			 continue;					\
} while (/* CONSTCOND */ 0)

/*
 * 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; */					\
do {									\
	if (((inm) = (step).i_inm) != NULL)				\
		(step).i_inm = LIST_NEXT((inm), inm_list);		\
	else								\
		while ((step).i_ia != NULL) {				\
			(inm) = LIST_FIRST(&(step).i_ia->ia_multiaddrs); \
			(step).i_ia = TAILQ_NEXT((step).i_ia, ia_list);	\
			if ((inm) != NULL) {				\
				(step).i_inm = LIST_NEXT((inm), inm_list); \
				break;					\
			}						\
		}							\
} while (/* CONSTCOND */ 0)

#define IN_FIRST_MULTI(step, inm)					\
	/* struct in_multistep step; */					\
	/* struct in_multi *inm; */					\
do {									\
	(step).i_ia = TAILQ_FIRST(&in_ifaddr);				\
	(step).i_inm = NULL;						\
	IN_NEXT_MULTI((step), (inm));					\
} while (/* CONSTCOND */ 0)

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

int	inet_nat64(int, const void *, void *, const void *, u_int8_t);
int	inet_nat46(int, const void *, void *, const void *, u_int8_t);
int	in_mask2len(struct in_addr *);
#endif


/* INET6 stuff */
#include <netinet6/in6_var.h>

#endif /* _NETINET_IN_VAR_H_ */