if.h

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

 */
#define	IF_QFULL(ifq)		((ifq)->ifq_len >= (ifq)->ifq_maxlen)
#define	IF_DROP(ifq)		((ifq)->ifq_drops++)
#define	IF_ENQUEUE(ifq, m) { \
/* printf(" IF_ENQUEUE: %p %p\n", ifq, m ); */ \
	(m)->m_nextpkt = 0; \
	if ((ifq)->ifq_tail == 0) \
		(ifq)->ifq_head = m; \
	else \
		(ifq)->ifq_tail->m_nextpkt = m; \
	(ifq)->ifq_tail = m; \
	(ifq)->ifq_len++; \
}
#define	IF_PREPEND(ifq, m) { \
/* printf(" IF_PREPEND: %p %p\n", ifq, m ); */ \
	(m)->m_nextpkt = (ifq)->ifq_head; \
	if ((ifq)->ifq_tail == 0) \
		(ifq)->ifq_tail = (m); \
	(ifq)->ifq_head = (m); \
	(ifq)->ifq_len++; \
}
#define	IF_DEQUEUE(ifq, m) { \
	(m) = (ifq)->ifq_head; \
	if (m) { \
/* printf(" IF_DEQUEUE: %p %p\n", ifq, m ); */ \
		if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
			(ifq)->ifq_tail = 0; \
		(m)->m_nextpkt = 0; \
		(ifq)->ifq_len--; \
	} \
}

#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
#endif /* KERNEL */

#define	IFQ_MAXLEN	50
#define	IFNET_SLOWHZ	1		/* granularity is 1 second */

/*
 * 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	ifnet *ifa_ifp;		/* back-pointer to interface */
	struct	ifaddr *ifa_next;	/* next address for interface */
	void	(*ifa_rtrequest)	/* check or clean routes (+ or -)'d */
		__P((int, struct rtentry *, struct sockaddr *));
	u_short	ifa_flags;		/* mostly rt_flags for cloning */
	short	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 */

/*
 * Message format for use in obtaining information about interfaces
 * from getkerninfo and the routing socket
 */
struct if_msghdr {
	u_short	ifm_msglen;	/* to skip over non-understood messages */
	u_char	ifm_version;	/* future binary compatability */
	u_char	ifm_type;	/* message type */
	int	ifm_addrs;	/* like rtm_addrs */
	int	ifm_flags;	/* value of if_flags */
	u_short	ifm_index;	/* index for associated ifp */
	struct	if_data ifm_data;/* statistics and other data about if */
};

/*
 * Message format for use in obtaining information about interface addresses
 * from getkerninfo and the routing socket
 */
struct ifa_msghdr {
	u_short	ifam_msglen;	/* to skip over non-understood messages */
	u_char	ifam_version;	/* future binary compatability */
	u_char	ifam_type;	/* message type */
	int	ifam_addrs;	/* like rtm_addrs */
	int	ifam_flags;	/* value of ifa_flags */
	u_short	ifam_index;	/* index for associated ifp */
	int	ifam_metric;	/* value of ifa_metric */
};

/*
 * Interface request structure used for socket
 * ioctl's.  All interface ioctl's must have parameter
 * definitions which begin with ifr_name.  The
 * remainder may be interface specific.
 */
struct	ifreq {
#define	IFNAMSIZ	16
	char	ifr_name[IFNAMSIZ];		/* if name, e.g. "en0" */
	union {
		struct	sockaddr ifru_addr;
		struct	sockaddr ifru_dstaddr;
		struct	sockaddr ifru_broadaddr;
		short	ifru_flags;
		int	ifru_metric;
		int	ifru_mtu;
		int	ifru_phys;
		int	ifru_media;
		caddr_t	ifru_data;
		int	(*ifru_tap)(struct ifnet *, struct ether_header *, struct mbuf *);
	} ifr_ifru;
#define	ifr_addr	ifr_ifru.ifru_addr	/* address */
#define	ifr_dstaddr	ifr_ifru.ifru_dstaddr	/* other end of p-to-p link */
#define	ifr_broadaddr	ifr_ifru.ifru_broadaddr	/* broadcast address */
#define	ifr_flags	ifr_ifru.ifru_flags	/* flags */
#define	ifr_metric	ifr_ifru.ifru_metric	/* metric */
#define	ifr_mtu		ifr_ifru.ifru_mtu	/* mtu */
#define ifr_phys	ifr_ifru.ifru_phys	/* physical wire */
#define ifr_media	ifr_ifru.ifru_media	/* physical media */
#define	ifr_data	ifr_ifru.ifru_data	/* for use by interface */
#define ifr_tap		ifr_ifru.ifru_tap	/* tap function */
};

struct ifaliasreq {
	char	ifra_name[IFNAMSIZ];		/* if name, e.g. "en0" */
	struct	sockaddr ifra_addr;
	struct	sockaddr ifra_broadaddr;
	struct	sockaddr ifra_mask;
};

struct ifmediareq {
	char	ifm_name[IFNAMSIZ];	/* if name, e.g. "en0" */
	int	ifm_current;		/* current media options */
	int	ifm_mask;		/* don't care mask */
	int	ifm_status;		/* media status */
	int	ifm_active;		/* active options */
	int	ifm_count;		/* # entries in ifm_ulist array */
	int	*ifm_ulist;		/* media words */
};
/*
 * Structure used in SIOCGIFCONF request.
 * Used to retrieve interface configuration
 * for machine (useful for programs which
 * must know all networks accessible).
 */
struct	ifconf {
	int	ifc_len;		/* size of associated buffer */
	union {
		caddr_t	ifcu_buf;
		struct	ifreq *ifcu_req;
	} ifc_ifcu;
#define	ifc_buf	ifc_ifcu.ifcu_buf	/* buffer address */
#define	ifc_req	ifc_ifcu.ifcu_req	/* array of structures returned */
};

#include <net/if_arp.h>

#ifdef KERNEL
#define	IFAFREE(ifa) \
	if ((ifa)->ifa_refcnt <= 0) \
		ifafree(ifa); \
	else \
		(ifa)->ifa_refcnt--;

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

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

void	if_attach __P((struct ifnet *));
void	if_down __P((struct ifnet *));
void	if_up __P((struct ifnet *));
#ifdef vax
void	ifubareset __P((int));
#endif
/*void	ifinit __P((void));*/ /* declared in systm.h for main() */
int	ifioctl __P((struct socket *, int, caddr_t, struct proc *));
int	ifpromisc __P((struct ifnet *, int));
struct	ifnet *ifunit __P((char *));

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 *));

int	looutput __P((struct ifnet *,
	   struct mbuf *, struct sockaddr *, struct rtentry *));
#endif /* KERNEL */

#endif /* !_NET_IF_H_ */