1/*
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that: (1) source code
4 * distributions retain the above copyright notice and this paragraph
5 * in its entirety, and (2) distributions including binary code include
6 * the above copyright notice and this paragraph in its entirety in
7 * the documentation or other materials provided with the distribution.
8 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
9 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
10 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11 * FOR A PARTICULAR PURPOSE.
12 *
13 * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
14 */
15
16#ifdef HAVE_CONFIG_H
17#include "config.h"
18#endif
19
20#include <tcpdump-stdinc.h>
21
22#include <stdio.h>
23#include <stdlib.h>
24
25#include "interface.h"
26#include "extract.h"
27#include "addrtoname.h"
28
29#include "udp.h"
30
31/*
32 * VXLAN header, draft-mahalingam-dutt-dcops-vxlan-03
33 *
34 *     0                   1                   2                   3
35 *     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
36 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
37 *    |R|R|R|R|I|R|R|R|            Reserved                           |
38 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
39 *    |                VXLAN Network Identifier (VNI) |   Reserved    |
40 *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 */
42
43void
44vxlan_print(const u_char *bp, u_int len)
45{
46    u_int8_t flags;
47    u_int32_t vni;
48
49    if (len < 8) {
50        printf("[|VXLAN]");
51        return;
52    }
53
54    flags = *bp;
55    bp += 4;
56
57    vni = EXTRACT_24BITS(bp);
58    bp += 4;
59
60    printf("VXLAN, ");
61
62    fputs("flags [", stdout);
63    if (flags & 0x08)
64        fputs("I", stdout);
65    else
66        fputs(".", stdout);
67    fputs("] ", stdout);
68
69    printf("(0x%02x), ", flags);
70    printf("vni %u\n", vni);
71
72    ether_print(gndo, bp, len - 8, len - 8, NULL, NULL);
73    return;
74}
75