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
43 void
otv_print(const u_char * bp,u_int len)44 otv_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