Add support for VXLAN (draft-mahalingam-dutt-dcops-vxlan-03)

1 files changed, 75 insertions, 0 deletions

diff --git a/print-vxlan.c b/print-vxlan.c
new file mode 100644
index 00000000..2e5433e3
--- /dev/null
+++ b/print-vxlan.c
@@ -0,0 +1,75 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code
+ * distributions retain the above copyright notice and this paragraph
+ * in its entirety, and (2) distributions including binary code include
+ * the above copyright notice and this paragraph in its entirety in
+ * the documentation or other materials provided with the distribution.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+ * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE.
+ *
+ * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "interface.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+#include "udp.h"
+
+/*
+ * VXLAN header, draft-mahalingam-dutt-dcops-vxlan-03
+ *
+ *     0                   1                   2                   3
+ *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |R|R|R|R|I|R|R|R|            Reserved                           |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                VXLAN Network Identifier (VNI) |   Reserved    |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
+ */
+
+void
+vxlan_print(const u_char *bp, u_int len, u_int port)
+{
+    u_int8_t flags;
+    u_int32_t vni;
+    
+    if (len < 8) {
+        printf("[|VXLAN]");
+        return;
+    }
+
+    flags = *bp;
+    bp += 4;
+
+    vni = EXTRACT_24BITS(bp);
+    bp += 4;
+
+    printf("VXLAN, ");
+
+    fputs("flags [", stdout);
+    if (flags & 0x08)
+        fputs("I", stdout);
+    else
+        fputs(".", stdout);
+    fputs("] ", stdout);
+
+    printf("(0x%02x), ", flags);
+    printf("vni %u\n", vni);
+
+    ether_print(gndo, bp, len - 8, len - 8, NULL, NULL);
+    return;
+}