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-rw-r--r--print-vxlan.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/print-vxlan.c b/print-vxlan.c
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+/*
+ * 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)
+ */
+
+/* \summary: Virtual eXtensible Local Area Network (VXLAN) printer */
+
+/* specification: RFC 7348 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+
+static const struct tok vxlan_flags [] = {
+ { 0x08, "I" },
+ { 0, NULL }
+};
+#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;
+
+ ndo->ndo_protocol = "vxlan";
+ nd_print_protocol_caps(ndo);
+ if (len < VXLAN_HDR_LEN)
+ goto invalid;
+
+ flags = GET_U_1(bp);
+ bp += 1;
+ ND_PRINT(", flags [%s] (0x%02x), ",
+ bittok2str_nosep(vxlan_flags, "invalid", flags), flags);
+
+ /* 1st Reserved */
+ bp += 3;
+
+ vni = GET_BE_U_3(bp);
+ bp += 3;
+ ND_PRINT("vni %u\n", vni);
+
+ /* 2nd Reserved */
+ ND_TCHECK_1(bp);
+ bp += 1;
+
+ ether_print(ndo, bp, len - VXLAN_HDR_LEN, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
+
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+}