create project

2018-10-18 11:10:50 +08:00
commit a6a34b3ba4
641 changed files with 151509 additions and 0 deletions
--- a/print-vxlan.c
+++ b/print-vxlan.c
@@ -0,0 +1,70 @@
+/*
+ * 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 <netdissect-stdinc.h>
+
+#include "netdissect.h"
+#include "extract.h"
+
+static const char tstr[] = " [|VXLAN]";
+
+#define VXLAN_HDR_LEN 8
+
+/*
+ * VXLAN header, RFC7348
+ *               Virtual eXtensible Local Area Network (VXLAN): A Framework
+ *               for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
+ *
+ *     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(netdissect_options *ndo, const u_char *bp, u_int len)
+{
+    uint8_t flags;
+    uint32_t vni;
+
+    if (len < VXLAN_HDR_LEN)
+        goto trunc;
+
+    ND_TCHECK2(*bp, VXLAN_HDR_LEN);
+
+    flags = *bp;
+    bp += 4;
+
+    vni = EXTRACT_24BITS(bp);
+    bp += 4;
+
+    ND_PRINT((ndo, "VXLAN, "));
+    ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags));
+    ND_PRINT((ndo, "vni %u\n", vni));
+
+    ether_print(ndo, bp, len - VXLAN_HDR_LEN, len - VXLAN_HDR_LEN, NULL, NULL);
+
+    return;
+
+trunc:
+    ND_PRINT((ndo, "%s", tstr));
+}