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ip/tinc: handle and set ethertype for ipv6

--- a/sys/src/cmd/ip/tinc.c

+++ b/sys/src/cmd/ip/tinc.c

@@ -1019,7 +1019,8 @@

 		memmove(p+4, p, 2*Eaddrlen);

 		p += 4, n -= 4;

 		goto Ether;

-	case 0x0800:	/* IP */

+	case 0x0800:	/* IPv4 */

+	case 0x86DD:	/* IPv6 */

 		break;

 	}

 	switch(p[EtherHdr] & 0xF0){

@@ -1534,8 +1535,13 @@

 		localip, localmask);

 	while((n = read(ipdfd, buf+EtherHdr, sizeof buf-EtherHdr)) > 0){

 		memset(buf, 0, 2*Eaddrlen);

-		buf[EtherType+0] = 0x08;

-		buf[EtherType+1] = 0x00;

+		if((buf[EtherHdr]&0xF0) == 0x60){

+			buf[EtherType+0] = 0x86;

+			buf[EtherType+1] = 0xDD;

+		} else{

+			buf[EtherType+0] = 0x08;

+			buf[EtherType+1] = 0x00;

+		}

 		routepkt(myhost, buf, n+EtherHdr);

 	}

 }