if_var.h

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#define	IF_DEQUEUE(ifq, m) { \
	(m) = (ifq)->ifq_head; \
	if (m) { \
		if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
			(ifq)->ifq_tail = 0; \
		(m)->m_nextpkt = 0; \
		(ifq)->ifq_len--; \
	} \
}
#define	IF_POLL(ifq, m)		((m) = (ifq)->ifq_head)
#define	IF_PURGE(ifq)							\
while (1) {								\
	struct mbuf *m0;						\
	IF_DEQUEUE((ifq), m0);						\
	if (m0 == NULL)							\
		break;							\
	else								\
		m_freem(m0);						\
}
#define	IF_IS_EMPTY(ifq)	((ifq)->ifq_len == 0)

#ifdef _KERNEL
#define	IF_ENQ_DROP(ifq, m)	if_enq_drop(ifq, m)

#if defined(__GNUC__) && defined(MT_HEADER)
static __inline int
if_queue_drop(struct ifqueue *ifq, struct mbuf *m)
{
	IF_DROP(ifq);
	return 0;
}

static __inline int
if_enq_drop(struct ifqueue *ifq, struct mbuf *m)
{
	if (IF_QFULL(ifq) &&
	    !if_queue_drop(ifq, m))
		return 0;
	IF_ENQUEUE(ifq, m);
	return 1;
}
#else

#ifdef MT_HEADER
int	if_enq_drop __P((struct ifqueue *, struct mbuf *));
#endif

#endif

/*
 * 72 was chosen below because it is the size of a TCP/IP
 * header (40) + the minimum mss (32).
 */
#define	IF_MINMTU	72
#define	IF_MAXMTU	65535

#endif /* _KERNEL */

#ifdef _KERNEL
#define	IFQ_ENQUEUE(ifq, m, err)					\
do {									\
	if (IF_QFULL((ifq))) {						\
		m_freem((m));						\
		(err) = ENOBUFS;					\
	} else {							\
		IF_ENQUEUE((ifq), (m));					\
		(err) = 0;						\
	}								\
	if ((err))							\
		(ifq)->ifq_drops++;					\
} while (0)

#define	IFQ_DEQUEUE(ifq, m)	IF_DEQUEUE((ifq), (m))

#define	IFQ_POLL(ifq, m)	IF_POLL((ifq), (m))

#define	IFQ_PURGE(ifq)							\
while (1) {								\
	struct mbuf *m0;						\
	IF_DEQUEUE((ifq), m0);						\
	if (m0 == NULL)							\
		break;							\
	else								\
		m_freem(m0);						\
}

#define	IFQ_SET_READY(ifq)		((void)0)
#define	IFQ_CLASSIFY(ifq, m, af, pa)	((void)0)

#define	IFQ_IS_EMPTY(ifq)		((ifq)->ifq_len == 0)
#define	IFQ_INC_LEN(ifq)		((ifq)->ifq_len++)
#define	IFQ_DEC_LEN(ifq)		(--(ifq)->ifq_len)
#define	IFQ_INC_DROPS(ifq)		((ifq)->ifq_drops++)
#define	IFQ_SET_MAXLEN(ifq, len)	((ifq)->ifq_maxlen = (len))

#endif /* _KERNEL */

/*
 * 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.
 */
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	if_data if_data;	/* not all members are meaningful */
	struct	ifnet *ifa_ifp;		/* back-pointer to interface */
	TAILQ_ENTRY(ifaddr) ifa_link;	/* queue macro glue */
	void	(*ifa_rtrequest)	/* check or clean routes (+ or -)'d */
		__P((int, struct rtentry *, struct sockaddr *));
	u_short	ifa_flags;		/* mostly rt_flags for cloning */
	u_int	ifa_refcnt;		/* references to this structure */
	int	ifa_metric;		/* cost of going out this interface */
#ifdef notdef
	struct	rtentry *ifa_rt;	/* XXXX for ROUTETOIF ????? */
#endif
	int (*ifa_claim_addr)		/* check if an addr goes to this if */
		__P((struct ifaddr *, struct sockaddr *));

};
#define	IFA_ROUTE	RTF_UP		/* route installed */
#define IFAREF(ifa)     do { ++(ifa)->ifa_refcnt; } while (0)

/* for compatibility with other BSDs */
#define	ifa_list	ifa_link

/*
 * The prefix structure contains information about one prefix
 * of an interface.  They are maintained by the different address families,
 * are allocated and attached when an prefix or an address is set,
 * and are linked together so all prefixes for an interface can be located.
 */
struct ifprefix {
	struct	sockaddr *ifpr_prefix;	/* prefix of interface */
	struct	ifnet *ifpr_ifp;	/* back-pointer to interface */
	TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
	u_char	ifpr_plen;		/* prefix length in bits */
	u_char	ifpr_type;		/* protocol dependent prefix type */
};

/*
 * Multicast address structure.  This is analogous to the ifaddr
 * structure except that it keeps track of multicast addresses.
 * Also, the reference count here is a count of requests for this
 * address, not a count of pointers to this structure.
 */
struct ifmultiaddr {
	LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
	struct	sockaddr *ifma_addr; 	/* address this membership is for */
	struct	sockaddr *ifma_lladdr;	/* link-layer translation, if any */
	struct	ifnet *ifma_ifp;	/* back-pointer to interface */
	u_int	ifma_refcount;		/* reference count */
	void	*ifma_protospec;	/* protocol-specific state, if any */
};

#ifdef _KERNEL
#define	IFAFREE(ifa) \
	do { \
		if ((ifa)->ifa_refcnt <= 0) \
			ifafree(ifa); \
		else \
			(ifa)->ifa_refcnt--; \
	} while (0)

extern	struct ifnethead ifnet;
extern  struct ifnet	**ifindex2ifnet;
extern	int ifqmaxlen;
extern	struct ifnet loif[];
extern	int if_index;
extern	struct ifaddr **ifnet_addrs;

void	ether_ifattach __P((struct ifnet *, int));
void	ether_ifdetach __P((struct ifnet *, int));
void	ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *));
void	ether_demux __P((struct ifnet *, struct ether_header *, struct mbuf *));
int	ether_output __P((struct ifnet *,
	   struct mbuf *, struct sockaddr *, struct rtentry *));
int	ether_output_frame __P((struct ifnet *, struct mbuf *));
int	ether_ioctl __P((struct ifnet *, int, caddr_t));

int	if_addmulti __P((struct ifnet *, struct sockaddr *,
			 struct ifmultiaddr **));
int	if_allmulti __P((struct ifnet *, int));
void	if_attach __P((struct ifnet *));
int	if_delmulti __P((struct ifnet *, struct sockaddr *));
void	if_detach __P((struct ifnet *));
void	if_down __P((struct ifnet *));
void	if_route __P((struct ifnet *, int flag, int fam));
int	if_setlladdr __P((struct ifnet *, const u_char *, int));
void	if_unroute __P((struct ifnet *, int flag, int fam));
void	if_up __P((struct ifnet *));
/*void	ifinit __P((void));*/ /* declared in systm.h for main() */
int	ifioctl __P((struct socket *, u_long, caddr_t, struct proc *));
int	ifpromisc __P((struct ifnet *, int));
struct	ifnet *ifunit __P((const char *));
struct	ifnet *if_withname __P((struct sockaddr *));

int	if_poll_recv_slow __P((struct ifnet *ifp, int *quotap));
void	if_poll_xmit_slow __P((struct ifnet *ifp, int *quotap));
void	if_poll_throttle __P((void));
void	if_poll_unthrottle __P((void *));
void	if_poll_init __P((void));
void	if_poll __P((void));

struct	ifaddr *ifa_ifwithaddr __P((struct sockaddr *));
struct	ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *));
struct	ifaddr *ifa_ifwithnet __P((struct sockaddr *));
struct	ifaddr *ifa_ifwithroute __P((int, struct sockaddr *,
					struct sockaddr *));
struct	ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *));
void	ifafree __P((struct ifaddr *));

struct	ifmultiaddr *ifmaof_ifpforaddr __P((struct sockaddr *,
					    struct ifnet *));
int	if_simloop __P((struct ifnet *ifp, struct mbuf *m, int af, int hlen));

void	if_clone_attach __P((struct if_clone *));
void	if_clone_detach __P((struct if_clone *));

int	if_clone_create __P((char *, int));
int	if_clone_destroy __P((const char *));

#endif /* _KERNEL */


#endif /* !_NET_IF_VAR_H_ */