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/*
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 * An ethernet /dev/null.
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 * Useful as a bridging target with ethernet-based VPN.
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 */
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#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "io.h"
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#include "../port/error.h"
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#include "../port/netif.h"
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#include "etherif.h"
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static long
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ctl(Ether *ether, void *buf, long n)
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{
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	uchar ea[Eaddrlen];
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	Cmdbuf *cb;
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	cb = parsecmd(buf, n);
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	if(cb->nf >= 2
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	&& strcmp(cb->f[0], "ea")==0
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	&& parseether(ea, cb->f[1]) == 0){
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		free(cb);
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		memmove(ether->ea, ea, Eaddrlen);
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		memmove(ether->addr, ether->ea, Eaddrlen);
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		return 0;
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	}
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	free(cb);
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	error(Ebadctl);
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	return -1;	/* not reached */
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}
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static void
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nop(Ether*)
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{
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}
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static int
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reset(Ether* ether)
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{
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	uchar ea[Eaddrlen];
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	if(ether->type==nil)
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		return -1;
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	memset(ea, 0, sizeof ea);
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	ether->mbps = 1000;
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	ether->attach = nop;
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	ether->transmit = nop;
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	ether->irq = -1;
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	ether->interrupt = nil;
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	ether->ifstat = nil;
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	ether->ctl = ctl;
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	ether->promiscuous = nil;
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	ether->multicast = nil;
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	ether->arg = ether;
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	return 0;
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}
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void
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ethersinklink(void)
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{
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	addethercard("sink", reset);
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}