72 lines
1.1 KiB
C
72 lines
1.1 KiB
C
/*
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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 "../port/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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attach(Ether *ether)
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{
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/* silently discard output */
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qnoblock(ether->oq, 1);
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qsetlimit(ether->oq, 0);
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}
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static void
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multicast(void *, uchar*, int)
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{
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}
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static void
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promiscuous(void *, int)
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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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if(ether->type==nil)
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return -1;
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ether->mbps = 1000;
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ether->attach = attach;
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ether->multicast = multicast;
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ether->promiscuous = promiscuous;
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ether->ctl = ctl;
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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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}
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