if.h

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

/*
 * Copyright (c) 1982, 1986, 1989, 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	@(#)if.h	8.1 (Berkeley) 6/10/93
 * $Id: if.h,v 1.4 2002/01/31 21:40:46 joel Exp $
 */

#ifndef _NET_IF_H_
#define	_NET_IF_H_

/*
 * Structures defining a network interface, providing a packet
 * transport mechanism (ala level 0 of the PUP protocols).
 *
 * Each interface accepts output datagrams of a specified maximum
 * length, and provides higher level routines with input datagrams
 * received from its medium.
 *
 * Output occurs when the routine if_output is called, with three parameters:
 *	(*ifp->if_output)(ifp, m, dst, rt)
 * Here m is the mbuf chain to be sent and dst is the destination address.
 * The output routine encapsulates the supplied datagram if necessary,
 * and then transmits it on its medium.
 *
 * On input, each interface unwraps the data received by it, and either
 * places it on the input queue of a internetwork datagram routine
 * and posts the associated software interrupt, or passes the datagram to a raw
 * packet input routine.
 *
 * Routines exist for locating interfaces by their addresses
 * or for locating a interface on a certain network, as well as more general
 * routing and gateway routines maintaining information used to locate
 * interfaces.  These routines live in the files if.c and route.c
 */

#ifndef _TIME_ /*  XXX fast fix for SNMP, going away soon */
#include <sys/time.h>
#endif

#ifdef __STDC__
/*
 * Forward structure declarations for function prototypes [sic].
 */
struct	mbuf;
struct	proc;
struct	rtentry;
struct	socket;
struct	ether_header;
#endif

/*
 * Structure describing information about an interface
 * which may be of interest to management entities.
 */
struct if_data {
	/* generic interface information */
	u_char	ifi_type;		/* ethernet, tokenring, etc */
	u_char	ifi_physical;		/* e.g., AUI, Thinnet, 10base-T, etc */
	u_char	ifi_addrlen;		/* media address length */
	u_char	ifi_hdrlen;		/* media header length */
	u_char	ifi_recvquota;		/* polling quota for receive intrs */
	u_char	ifi_xmitquota;		/* polling quota for xmit intrs */
	u_long	ifi_mtu;		/* maximum transmission unit */
	u_long	ifi_metric;		/* routing metric (external only) */
	u_long	ifi_baudrate;		/* linespeed */
	/* volatile statistics */
	u_long	ifi_ipackets;		/* packets received on interface */
	u_long	ifi_ierrors;		/* input errors on interface */
	u_long	ifi_opackets;		/* packets sent on interface */
	u_long	ifi_oerrors;		/* output errors on interface */
	u_long	ifi_collisions;		/* collisions on csma interfaces */
	u_long	ifi_ibytes;		/* total number of octets received */
	u_long	ifi_obytes;		/* total number of octets sent */
	u_long	ifi_imcasts;		/* packets received via multicast */
	u_long	ifi_omcasts;		/* packets sent via multicast */
	u_long	ifi_iqdrops;		/* dropped on input, this interface */
	u_long	ifi_noproto;		/* destined for unsupported protocol */
	u_long	ifi_recvtiming;		/* usec spent receiving when timing */
	u_long	ifi_xmittiming;		/* usec spent xmitting when timing */
	struct	timeval ifi_lastchange;	/* time of last administrative change */
};

/*
 * Structure defining a queue for a network interface.
 */
struct	ifqueue {
	struct	mbuf *ifq_head;
	struct	mbuf *ifq_tail;
	int	ifq_len;
	int	ifq_maxlen;
	int	ifq_drops;
};

/*
 * Structure defining a network interface.
 *
 * (Would like to call this struct ``if'', but C isn't PL/1.)
 */
struct ifnet {
	void	*if_softc;		/* pointer to driver state */
	char	*if_name;		/* name, e.g. ``en'' or ``lo'' */
	struct	ifnet *if_next;		/* all struct ifnets are chained */
	struct	ifaddr *if_addrlist;	/* linked list of addresses per if */
        int	if_pcount;		/* number of promiscuous listeners */
	struct	bpf_if *if_bpf;		/* packet filter structure */
	u_short	if_index;		/* numeric abbreviation for this if  */
	short	if_unit;		/* sub-unit for lower level driver */
	short	if_timer;		/* time 'til if_watchdog called */
	short	if_flags;		/* up/down, broadcast, etc. */
	int	if_ipending;		/* interrupts pending */
	void	*if_linkmib;		/* link-type-specific MIB data */
	size_t	if_linkmiblen;		/* length of above data */
	struct	if_data if_data;
/* procedure handles */
	int	(*if_output)		/* output routine (enqueue) */
		__P((struct ifnet *, struct mbuf *, struct sockaddr *,
		     struct rtentry *));
	void	(*if_start)		/* initiate output routine */
		__P((struct ifnet *));
	int	(*if_done)		/* output complete routine */
		__P((struct ifnet *));	/* (XXX not used; fake prototype) */
	int	(*if_ioctl)		/* ioctl routine */
		__P((struct ifnet *, int, caddr_t));
	void	(*if_watchdog)		/* timer routine */
		__P((struct ifnet *));
	int	(*if_poll_recv)		/* polled receive routine */
		__P((struct ifnet *, int *));
	int	(*if_poll_xmit)		/* polled transmit routine */
		__P((struct ifnet *, int *));
	void	(*if_poll_intren)	/* polled interrupt reenable routine */
		__P((struct ifnet *));
	void	(*if_poll_slowinput)	/* input routine for slow devices */
		__P((struct ifnet *, struct mbuf *));
	void	(*if_init)		/* Init routine */
		__P((void *));
	int	(*if_tap)		/* Packet filter routine */
		(struct ifnet *, struct ether_header *, struct mbuf *);
	struct	ifqueue if_snd;		/* output queue */
	struct	ifqueue *if_poll_slowq;	/* input queue for slow devices */
};
typedef void if_init_f_t __P((void *));       

#define	if_mtu		if_data.ifi_mtu
#define	if_type		if_data.ifi_type
#define if_physical	if_data.ifi_physical
#define	if_addrlen	if_data.ifi_addrlen
#define	if_hdrlen	if_data.ifi_hdrlen
#define	if_metric	if_data.ifi_metric
#define	if_baudrate	if_data.ifi_baudrate
#define	if_ipackets	if_data.ifi_ipackets
#define	if_ierrors	if_data.ifi_ierrors
#define	if_opackets	if_data.ifi_opackets
#define	if_oerrors	if_data.ifi_oerrors
#define	if_collisions	if_data.ifi_collisions
#define	if_ibytes	if_data.ifi_ibytes
#define	if_obytes	if_data.ifi_obytes
#define	if_imcasts	if_data.ifi_imcasts
#define	if_omcasts	if_data.ifi_omcasts
#define	if_iqdrops	if_data.ifi_iqdrops
#define	if_noproto	if_data.ifi_noproto
#define	if_lastchange	if_data.ifi_lastchange
#define if_recvquota	if_data.ifi_recvquota
#define	if_xmitquota	if_data.ifi_xmitquota
#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)

#define	IFF_UP		0x1		/* interface is up */
#define	IFF_BROADCAST	0x2		/* broadcast address valid */
#define	IFF_DEBUG	0x4		/* turn on debugging */
#define	IFF_LOOPBACK	0x8		/* is a loopback net */
#define	IFF_POINTOPOINT	0x10		/* interface is point-to-point link */
/*#define IFF_NOTRAILERS 0x20		 * obsolete: avoid use of trailers */
#define	IFF_RUNNING	0x40		/* resources allocated */
#define	IFF_NOARP	0x80		/* no address resolution protocol */
#define	IFF_PROMISC	0x100		/* receive all packets */
#define	IFF_ALLMULTI	0x200		/* receive all multicast packets */
#define	IFF_OACTIVE	0x400		/* transmission in progress */
#define	IFF_SIMPLEX	0x800		/* can't hear own transmissions */
#define	IFF_LINK0	0x1000		/* per link layer defined bit */
#define	IFF_LINK1	0x2000		/* per link layer defined bit */
#define	IFF_LINK2	0x4000		/* per link layer defined bit */
#define	IFF_ALTPHYS	IFF_LINK2	/* use alternate physical connection */
#define	IFF_MULTICAST	0x8000		/* supports multicast */

/* flags set internally only: */
#define	IFF_CANTCHANGE \
	(IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\
	    IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI)


/*
 * These really don't belong here, but there's no other obviously appropriate
 * location.
 */
#define IFP_AUI		0
#define IFP_10BASE2	1
#define IFP_10BASET	2
/* etc. */

/*
 * Bit values in if_ipending
 */
#define	IFI_RECV	1	/* I want to receive */
#define	IFI_XMIT	2	/* I want to transmit */

/*
 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 * are queues of messages stored on ifqueue structures
 * (defined above).  Entries are added to and deleted from these structures
 * by these macros, which should be called with ipl raised to splimp().