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 * OTV header, draft-hasmit-otv-04
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|           Overlay ID                          |
38 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
39 *     |          Instance ID                          | Reserved      |
40 *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
41 */
42
43void
44otv_print(const u_char *bp, u_int len)
45{
46    u_int8_t flags;
47    u_int32_t overlay_id;
48    u_int32_t instance_id;
49
50    if (len < 8) {
51        printf("[|OTV]");
52        return;
53    }
54
55    flags = *bp;
56    bp += 1;
57
58    overlay_id = EXTRACT_24BITS(bp);
59    bp += 3;
60
61    instance_id = EXTRACT_24BITS(bp);
62    bp += 4;
63
64    printf("OTV, ");
65
66    fputs("flags [", stdout);
67    if (flags & 0x08)
68        fputs("I", stdout);
69    else
70        fputs(".", stdout);
71    fputs("] ", stdout);
72
73    printf("(0x%02x), ", flags);
74    printf("overlay %u, ", overlay_id);
75    printf("instance %u\n", instance_id);
76
77    ether_print(gndo, bp, len - 8, len - 8, NULL, NULL);
78    return;
79}
80