ref: c739f57ac2f136e67be63a4678d4171889057105
dir: /sys/src/9/port/ethersink.c/
/* * An ethernet /dev/null. * Useful as a bridging target with ethernet-based VPN. */ #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "../port/error.h" #include "../port/netif.h" #include "../port/etherif.h" static long ctl(Ether *ether, void *buf, long n) { uchar ea[Eaddrlen]; Cmdbuf *cb; cb = parsecmd(buf, n); if(cb->nf >= 2 && strcmp(cb->f[0], "ea")==0 && parseether(ea, cb->f[1]) == 0){ free(cb); memmove(ether->ea, ea, Eaddrlen); memmove(ether->addr, ether->ea, Eaddrlen); return 0; } free(cb); error(Ebadctl); return -1; /* not reached */ } static void attach(Ether *ether) { /* silently discard output */ qnoblock(ether->oq, 1); qsetlimit(ether->oq, 0); } static void multicast(void *, uchar*, int) { } static void promiscuous(void *, int) { } static int reset(Ether* ether) { if(ether->type==nil) return -1; ether->mbps = 1000; ether->attach = attach; ether->multicast = multicast; ether->promiscuous = promiscuous; ether->ctl = ctl; ether->arg = ether; return 0; } void ethersinklink(void) { addethercard("sink", reset); }