unswap src and dst ip in "too big DF broadcast" warning

and some whitespace cosmetics.

Fixes #1508.

router/ethernet_decoder.go

@@ -60,7 +60,7 @@ func (dec *EthernetDecoder) sendICMPFragNeeded(mtu int, sendFrame func([]byte) e
 		return err
 	}
 
-	log.Printf("Sending ICMP 3,4 (%v -> %v): PMTU= %v", dec.IP.DstIP, dec.IP.SrcIP, mtu)
+	log.Printf("Sending ICMP 3,4 (%v -> %v): PMTU=%v", dec.IP.DstIP, dec.IP.SrcIP, mtu)
 	return sendFrame(buf.Bytes())
 }
 

router/local_peer.go

@@ -69,7 +69,7 @@ func (peer *LocalPeer) RelayBroadcast(srcPeer *Peer, frame []byte, dec *Ethernet
 			dec)
 		if err != nil {
 			if ftbe, ok := err.(FrameTooBigError); ok {
-				log.Warningf("dropping too big DF broadcast frame (%v -> %v): PMTU= %v", dec.IP.DstIP, dec.IP.SrcIP, ftbe.EPMTU)
+				log.Warningf("dropping too big DF broadcast frame (%v -> %v): PMTU=%v", dec.IP.SrcIP, dec.IP.DstIP, ftbe.EPMTU)
 			} else {
 				log.Errorln(err)
 			}