Move shared layer 2 global declarations into an appropriate header file.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

ptp4l.c

@@ -26,13 +26,12 @@
 #include "config.h"
 #include "pi.h"
 #include "print.h"
+#include "raw.h"
 #include "sk.h"
 #include "transport.h"
 #include "util.h"
 
 int assume_two_step;
-extern unsigned char ptp_dst_mac[]; /*see raw.c*/
-extern unsigned char p2p_dst_mac[]; /*see raw.c*/
 
 static int running = 1;
 

raw.h

@@ -23,6 +23,16 @@
 #include "fd.h"
 #include "transport.h"
 
+/**
+ * The MAC address to use for non-peer messages.
+ */
+extern unsigned char ptp_dst_mac[];
+
+/**
+ * The MAC address to use for peer messages.
+ */
+extern unsigned char p2p_dst_mac[];
+
 /**
  * Allocate an instance of a raw Ethernet transport.
  * @return Pointer to a new transport instance on success, NULL otherwise.