Don't send ICMPv6 back when tun disabled

src/yggdrasil/router.go

@@ -270,25 +270,6 @@ func (r *router) sendPacket(bs []byte) {
 		// Drop packets if the session MTU is 0 - this means that one or other
 		// side probably has their TUN adapter disabled
 		if sinfo.getMTU() == 0 {
-			// Get the size of the oversized payload, up to a max of 900 bytes
-			window := 900
-			if len(bs) < window {
-				window = len(bs)
-			}
-
-			// Create the Destination Unreachable response
-			ptb := &icmp.DstUnreach{
-				Data: bs[:window],
-			}
-
-			// Create the ICMPv6 response from it
-			icmpv6Buf, err := r.tun.icmpv6.create_icmpv6_tun(
-				bs[8:24], bs[24:40],
-				ipv6.ICMPTypeDestinationUnreachable, 1, ptb)
-			if err == nil {
-				r.recv <- icmpv6Buf
-			}
-
 			// Don't continue - drop the packet
 			return
 		}