1*05b00f60SXin Li /*
2*05b00f60SXin Li * Redistribution and use in source and binary forms, with or without
3*05b00f60SXin Li * modification, are permitted provided that: (1) source code
4*05b00f60SXin Li * distributions retain the above copyright notice and this paragraph
5*05b00f60SXin Li * in its entirety, and (2) distributions including binary code include
6*05b00f60SXin Li * the above copyright notice and this paragraph in its entirety in
7*05b00f60SXin Li * the documentation or other materials provided with the distribution.
8*05b00f60SXin Li * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
9*05b00f60SXin Li * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
10*05b00f60SXin Li * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11*05b00f60SXin Li * FOR A PARTICULAR PURPOSE.
12*05b00f60SXin Li *
13*05b00f60SXin Li * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
14*05b00f60SXin Li */
15*05b00f60SXin Li
16*05b00f60SXin Li /* \summary: Overlay Transport Virtualization (OTV) printer */
17*05b00f60SXin Li
18*05b00f60SXin Li /* specification: draft-hasmit-otv-04 */
19*05b00f60SXin Li
20*05b00f60SXin Li #ifdef HAVE_CONFIG_H
21*05b00f60SXin Li #include <config.h>
22*05b00f60SXin Li #endif
23*05b00f60SXin Li
24*05b00f60SXin Li #include "netdissect-stdinc.h"
25*05b00f60SXin Li
26*05b00f60SXin Li #define ND_LONGJMP_FROM_TCHECK
27*05b00f60SXin Li #include "netdissect.h"
28*05b00f60SXin Li #include "extract.h"
29*05b00f60SXin Li
30*05b00f60SXin Li #define OTV_HDR_LEN 8
31*05b00f60SXin Li
32*05b00f60SXin Li /*
33*05b00f60SXin Li * OTV header, draft-hasmit-otv-04
34*05b00f60SXin Li *
35*05b00f60SXin Li * 0 1 2 3
36*05b00f60SXin Li * 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
37*05b00f60SXin Li * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38*05b00f60SXin Li * |R|R|R|R|I|R|R|R| Overlay ID |
39*05b00f60SXin Li * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40*05b00f60SXin Li * | Instance ID | Reserved |
41*05b00f60SXin Li * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
42*05b00f60SXin Li */
43*05b00f60SXin Li
44*05b00f60SXin Li void
otv_print(netdissect_options * ndo,const u_char * bp,u_int len)45*05b00f60SXin Li otv_print(netdissect_options *ndo, const u_char *bp, u_int len)
46*05b00f60SXin Li {
47*05b00f60SXin Li uint8_t flags;
48*05b00f60SXin Li
49*05b00f60SXin Li ndo->ndo_protocol = "otv";
50*05b00f60SXin Li ND_PRINT("OTV, ");
51*05b00f60SXin Li if (len < OTV_HDR_LEN) {
52*05b00f60SXin Li ND_PRINT("[length %u < %u]", len, OTV_HDR_LEN);
53*05b00f60SXin Li goto invalid;
54*05b00f60SXin Li }
55*05b00f60SXin Li
56*05b00f60SXin Li flags = GET_U_1(bp);
57*05b00f60SXin Li ND_PRINT("flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags);
58*05b00f60SXin Li bp += 1;
59*05b00f60SXin Li
60*05b00f60SXin Li ND_PRINT("overlay %u, ", GET_BE_U_3(bp));
61*05b00f60SXin Li bp += 3;
62*05b00f60SXin Li
63*05b00f60SXin Li ND_PRINT("instance %u\n", GET_BE_U_3(bp));
64*05b00f60SXin Li bp += 3;
65*05b00f60SXin Li
66*05b00f60SXin Li /* Reserved */
67*05b00f60SXin Li ND_TCHECK_1(bp);
68*05b00f60SXin Li bp += 1;
69*05b00f60SXin Li
70*05b00f60SXin Li ether_print(ndo, bp, len - OTV_HDR_LEN, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
71*05b00f60SXin Li return;
72*05b00f60SXin Li
73*05b00f60SXin Li invalid:
74*05b00f60SXin Li nd_print_invalid(ndo);
75*05b00f60SXin Li ND_TCHECK_LEN(bp, len);
76*05b00f60SXin Li }
77