1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/*
* 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: Overlay Transport Virtualization (OTV) printer */
/* specification: draft-hasmit-otv-04 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "extract.h"
#define OTV_HDR_LEN 8
/*
* OTV header, draft-hasmit-otv-04
*
* 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| Overlay ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Instance ID | Reserved |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
void
otv_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
uint8_t flags;
ndo->ndo_protocol = "otv";
ND_PRINT("OTV, ");
if (len < OTV_HDR_LEN) {
ND_PRINT("[length %u < %u]", len, OTV_HDR_LEN);
goto invalid;
}
flags = GET_U_1(bp);
ND_PRINT("flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags);
bp += 1;
ND_PRINT("overlay %u, ", GET_BE_U_3(bp));
bp += 3;
ND_PRINT("instance %u\n", GET_BE_U_3(bp));
bp += 3;
/* Reserved */
ND_TCHECK_1(bp);
bp += 1;
ether_print(ndo, bp, len - OTV_HDR_LEN, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
return;
invalid:
nd_print_invalid(ndo);
ND_TCHECK_LEN(bp, len);
}
|
