xref: /freebsd/contrib/tcpdump/print-otv.c (revision 0a7e5f1f02aad2ff5fff1c60f44c6975fd07e1d9)
1d03c0883SXin LI /*
2d03c0883SXin LI  * Redistribution and use in source and binary forms, with or without
3d03c0883SXin LI  * modification, are permitted provided that: (1) source code
4d03c0883SXin LI  * distributions retain the above copyright notice and this paragraph
5d03c0883SXin LI  * in its entirety, and (2) distributions including binary code include
6d03c0883SXin LI  * the above copyright notice and this paragraph in its entirety in
7d03c0883SXin LI  * the documentation or other materials provided with the distribution.
8d03c0883SXin LI  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
9d03c0883SXin LI  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
10d03c0883SXin LI  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11d03c0883SXin LI  * FOR A PARTICULAR PURPOSE.
12d03c0883SXin LI  *
13d03c0883SXin LI  * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com)
14d03c0883SXin LI  */
15d03c0883SXin LI 
163340d773SGleb Smirnoff /* \summary: Overlay Transport Virtualization (OTV) printer */
173340d773SGleb Smirnoff 
183340d773SGleb Smirnoff /* specification: draft-hasmit-otv-04 */
193340d773SGleb Smirnoff 
20*ee67461eSJoseph Mingrone #include <config.h>
21d03c0883SXin LI 
22*ee67461eSJoseph Mingrone #include "netdissect-stdinc.h"
23d03c0883SXin LI 
24*ee67461eSJoseph Mingrone #define ND_LONGJMP_FROM_TCHECK
253340d773SGleb Smirnoff #include "netdissect.h"
26d03c0883SXin LI #include "extract.h"
27d03c0883SXin LI 
28*ee67461eSJoseph Mingrone #define OTV_HDR_LEN 8
29*ee67461eSJoseph Mingrone 
30d03c0883SXin LI /*
31d03c0883SXin LI  * OTV header, draft-hasmit-otv-04
32d03c0883SXin LI  *
33d03c0883SXin LI  *     0                   1                   2                   3
34d03c0883SXin 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
35d03c0883SXin LI  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
36d03c0883SXin LI  *     |R|R|R|R|I|R|R|R|           Overlay ID                          |
37d03c0883SXin LI  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38d03c0883SXin LI  *     |          Instance ID                          | Reserved      |
39d03c0883SXin LI  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40d03c0883SXin LI  */
41d03c0883SXin LI 
42d03c0883SXin LI void
otv_print(netdissect_options * ndo,const u_char * bp,u_int len)433c602fabSXin LI otv_print(netdissect_options *ndo, const u_char *bp, u_int len)
44d03c0883SXin LI {
453c602fabSXin LI     uint8_t flags;
46d03c0883SXin LI 
47*ee67461eSJoseph Mingrone     ndo->ndo_protocol = "otv";
48*ee67461eSJoseph Mingrone     ND_PRINT("OTV, ");
49*ee67461eSJoseph Mingrone     if (len < OTV_HDR_LEN) {
50*ee67461eSJoseph Mingrone         ND_PRINT("[length %u < %u]", len, OTV_HDR_LEN);
51*ee67461eSJoseph Mingrone         goto invalid;
52*ee67461eSJoseph Mingrone     }
53d03c0883SXin LI 
54*ee67461eSJoseph Mingrone     flags = GET_U_1(bp);
55*ee67461eSJoseph Mingrone     ND_PRINT("flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags);
563340d773SGleb Smirnoff     bp += 1;
573340d773SGleb Smirnoff 
58*ee67461eSJoseph Mingrone     ND_PRINT("overlay %u, ", GET_BE_U_3(bp));
593340d773SGleb Smirnoff     bp += 3;
603340d773SGleb Smirnoff 
61*ee67461eSJoseph Mingrone     ND_PRINT("instance %u\n", GET_BE_U_3(bp));
623340d773SGleb Smirnoff     bp += 3;
633340d773SGleb Smirnoff 
643340d773SGleb Smirnoff     /* Reserved */
65*ee67461eSJoseph Mingrone     ND_TCHECK_1(bp);
663340d773SGleb Smirnoff     bp += 1;
673340d773SGleb Smirnoff 
68*ee67461eSJoseph Mingrone     ether_print(ndo, bp, len - OTV_HDR_LEN, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
693340d773SGleb Smirnoff     return;
703340d773SGleb Smirnoff 
71*ee67461eSJoseph Mingrone invalid:
72*ee67461eSJoseph Mingrone     nd_print_invalid(ndo);
73*ee67461eSJoseph Mingrone     ND_TCHECK_LEN(bp, len);
74d03c0883SXin LI }
75