/*

 * The ifaddr structure contains information about one address

 * of an interface.  They are maintained by the different address families,

 * are allocated and attached when an address is set, and are linked

 * together so all addresses for an interface can be located.

 *

 * NOTE: a 'struct ifaddr' is always at the beginning of a larger

 * chunk of malloc'ed memory, where we store the three addresses

 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.

 */

struct ifaddr {

	struct	sockaddr *ifa_addr;	/* address of interface */

	struct	sockaddr *ifa_dstaddr;	/* other end of p-to-p link */

#define	ifa_broadaddr	ifa_dstaddr	/* broadcast address interface */

	struct	sockaddr *ifa_netmask;	/* used to determine subnet */

	struct	ifnet *ifa_ifp;		/* back-pointer to interface */

	struct	carp_softc *ifa_carp;	/* pointer to CARP data */

	TAILQ_ENTRY(ifaddr) ifa_link;	/* queue macro glue */

	void	(*ifa_rtrequest)	/* check or clean routes (+ or -)'d */

		(int, struct rtentry *, struct rt_addrinfo *);

	u_short	ifa_flags;		/* mostly rt_flags for cloning */

#define	IFA_ROUTE	RTF_UP		/* route installed */

#define	IFA_RTSELF	RTF_HOST	/* loopback route to self installed */

	u_int	ifa_refcnt;		/* references to this structure */

	counter_u64_t	ifa_ipackets;

	counter_u64_t	ifa_opackets;	 

	counter_u64_t	ifa_ibytes;

	counter_u64_t	ifa_obytes;

};