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typedef struct Etherpkt	Etherpkt;
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typedef struct Netaddr	Netaddr;
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typedef struct Netfile	Netfile;
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typedef struct Netif	Netif;
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enum
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{
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	Nmaxaddr=	64,
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	Nmhash=		31,
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	Ncloneqid=	1,
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	Naddrqid,
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	N2ndqid,
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	N3rdqid,
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	Ndataqid,
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	Nctlqid,
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	Nstatqid,
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	Ntypeqid,
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	Nifstatqid,
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};
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/*
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 *  Macros to manage Qid's used for multiplexed devices
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 */
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#define NETTYPE(x)	(((ulong)x)&0x1f)
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#define NETID(x)	((((ulong)x))>>5)
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#define NETQID(i,t)	((((ulong)i)<<5)|(t))
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/*
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 *  one per multiplexed connection
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 */
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struct Netfile
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{
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	QLock lk;
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	int	inuse;
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	ulong	mode;
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	char	owner[KNAMELEN];
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	int	type;			/* multiplexor type */
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	int	prom;			/* promiscuous mode */
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	int	scan;			/* base station scanning interval */
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	int	bridge;			/* bridge mode */
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	int	headersonly;		/* headers only - no data */
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	uchar	maddr[8];		/* bitmask of multicast addresses requested */
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	int	nmaddr;			/* number of multicast addresses */
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	Queue	*in;			/* input buffer */
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};
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/*
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 *  a network address
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 */
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struct Netaddr
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{
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	Netaddr	*next;		/* allocation chain */
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	Netaddr	*hnext;
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	uchar	addr[Nmaxaddr];
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	int	ref;
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};
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/*
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 *  a network interface
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 */
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struct Netif
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{
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	QLock lk;
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	/* multiplexing */
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	char	name[KNAMELEN];		/* for top level directory */
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	int	nfile;			/* max number of Netfiles */
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	Netfile	**f;
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	/* about net */
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	int	limit;			/* flow control */
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	int	alen;			/* address length */
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	int	mbps;			/* megabits per sec */
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	uchar	addr[Nmaxaddr];
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	uchar	bcast[Nmaxaddr];
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	Netaddr	*maddr;			/* known multicast addresses */
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	int	nmaddr;			/* number of known multicast addresses */
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	Netaddr *mhash[Nmhash];		/* hash table of multicast addresses */
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	int	prom;			/* number of promiscuous opens */
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	int	scan;			/* number of base station scanners */
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	int	all;			/* number of -1 multiplexors */
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	/* statistics */
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	int	misses;
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	int	inpackets;
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	int	outpackets;
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	int	crcs;		/* input crc errors */
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	int	oerrs;		/* output errors */
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	int	frames;		/* framing errors */
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	int	overflows;	/* packet overflows */
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	int	buffs;		/* buffering errors */
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	int	soverflows;	/* software overflow */
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	/* routines for touching the hardware */
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	void	*arg;
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	void	(*promiscuous)(void*, int);
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	void	(*multicast)(void*, uchar*, int);
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	void	(*scanbs)(void*, uint);	/* scan for base stations */
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};
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void	netifinit(Netif*, char*, int, ulong);
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Walkqid*	netifwalk(Netif*, Chan*, Chan*, char **, int);
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Chan*	netifopen(Netif*, Chan*, int);
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void	netifclose(Netif*, Chan*);
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long	netifread(Netif*, Chan*, void*, long, ulong);
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Block*	netifbread(Netif*, Chan*, long, ulong);
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long	netifwrite(Netif*, Chan*, void*, long);
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int	netifwstat(Netif*, Chan*, uchar*, int);
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int	netifstat(Netif*, Chan*, uchar*, int);
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int	activemulti(Netif*, uchar*, int);
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/*
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 *  Ethernet specific
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 */
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enum
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{
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	Eaddrlen=	6,
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	ETHERMINTU =	60,		/* minimum transmit size */
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	ETHERMAXTU =	1514,		/* maximum transmit size */
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	ETHERHDRSIZE =	14,		/* size of an ethernet header */
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};
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struct Etherpkt
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{
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	uchar	d[Eaddrlen];
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	uchar	s[Eaddrlen];
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	uchar	type[2];
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	uchar	data[1500];
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};