#include "u.h"#include "../port/lib.h"#include "mem.h"#include "dat.h"#include "fns.h"#include "../port/error.h" #include "ip.h"  static void	pktbind(Ipifc*, int, char**);static void	pktunbind(Ipifc*);static void	pktbwrite(Ipifc*, Block*, int, uchar*);static void	pktin(Fs*, Ipifc*, Block*); Medium pktmedium ={.name=		"pkt",.hsize=		14,.mintu=		40,.maxtu=		4*1024,.maclen=	6,.bind=		pktbind,.unbind=	pktunbind,.bwrite=	pktbwrite,.pktin=		pktin,.unbindonclose=	1,}; /* *  called to bind an IP ifc to an ethernet device *  called with ifc wlock'd */static voidpktbind(Ipifc*, int, char**){} /* *  called with ifc wlock'd */static voidpktunbind(Ipifc*){} /* *  called by ipoput with a single packet to write */static voidpktbwrite(Ipifc *ifc, Block *bp, int, uchar*){	/* enqueue onto the conversation's rq */	bp = concatblock(bp);	if(ifc->conv->snoopers.ref > 0)		qpass(ifc->conv->sq, copyblock(bp, BLEN(bp)));	qpass(ifc->conv->rq, bp);} /* *  called with ifc rlocked when someone write's to 'data' */static voidpktin(Fs *f, Ipifc *ifc, Block *bp){	if(ifc->lifc == nil)		freeb(bp);	else {		if(ifc->conv->snoopers.ref > 0)			qpass(ifc->conv->sq, copyblock(bp, BLEN(bp)));		ipiput4(f, ifc, bp);	}} voidpktmediumlink(void){	addipmedium(&pktmedium);}