1 files changed, 65 insertions, 0 deletions
diff --git a/os/port/ethersink.c b/os/port/ethersink.c
new file mode 100644
index 00000000..dd701804
--- /dev/null
+++ b/os/port/ethersink.c
@@ -0,0 +1,65 @@
+/*
+ * 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 "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
+nop(Ether*)
+{
+}
+
+static int
+reset(Ether* ether)
+{
+	uchar ea[Eaddrlen];
+
+	if(ether->type==nil)
+		return -1;
+	memset(ea, 0, sizeof ea);
+	ether->mbps = 1000;
+	ether->attach = nop;
+	ether->transmit = nop;
+	ether->irq = -1;
+	ether->interrupt = nil;
+	ether->ifstat = nil;
+	ether->ctl = ctl;
+	ether->promiscuous = nil;
+	ether->multicast = nil;
+	ether->arg = ether;
+	return 0;
+}
+
+void
+ethersinklink(void)
+{
+	addethercard("sink", reset);
+}