1/*
2 * Copyright (c) 1998-2007 The TCPDUMP project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in
9 * the documentation or other materials provided with the distribution.
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
13 * FOR A PARTICULAR PURPOSE.
14 *
15 * Dynamic Trunk Protocol (DTP)
16 *
17 * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
18 */
19
20#define NETDISSECT_REWORKED
21#ifdef HAVE_CONFIG_H
22#include "config.h"
23#endif
24
25#include <tcpdump-stdinc.h>
26
27#include "interface.h"
28#include "addrtoname.h"
29#include "extract.h"
30
31#define DTP_HEADER_LEN			1
32#define DTP_DOMAIN_TLV			0x0001
33#define DTP_STATUS_TLV			0x0002
34#define DTP_DTP_TYPE_TLV		0x0003
35#define DTP_NEIGHBOR_TLV		0x0004
36
37static const struct tok dtp_tlv_values[] = {
38    { DTP_DOMAIN_TLV, "Domain TLV"},
39    { DTP_STATUS_TLV, "Status TLV"},
40    { DTP_DTP_TYPE_TLV, "DTP type TLV"},
41    { DTP_NEIGHBOR_TLV, "Neighbor TLV"},
42    { 0, NULL}
43};
44
45void
46dtp_print (netdissect_options *ndo, const u_char *pptr, u_int length)
47{
48    int type, len;
49    const u_char *tptr;
50
51    if (length < DTP_HEADER_LEN)
52        goto trunc;
53
54    tptr = pptr;
55
56    ND_TCHECK2(*tptr, DTP_HEADER_LEN);
57
58    ND_PRINT((ndo, "DTPv%u, length %u",
59           (*tptr),
60           length));
61
62    /*
63     * In non-verbose mode, just print version.
64     */
65    if (ndo->ndo_vflag < 1) {
66	return;
67    }
68
69    tptr += DTP_HEADER_LEN;
70
71    while (tptr < (pptr+length)) {
72
73        ND_TCHECK2(*tptr, 4);
74
75	type = EXTRACT_16BITS(tptr);
76        len  = EXTRACT_16BITS(tptr+2);
77
78        /* infinite loop check */
79        if (type == 0 || len == 0) {
80            return;
81        }
82
83        ND_PRINT((ndo, "\n\t%s (0x%04x) TLV, length %u",
84               tok2str(dtp_tlv_values, "Unknown", type),
85               type, len));
86
87        switch (type) {
88	case DTP_DOMAIN_TLV:
89		ND_PRINT((ndo, ", %s", tptr+4));
90		break;
91
92	case DTP_STATUS_TLV:
93	case DTP_DTP_TYPE_TLV:
94                ND_PRINT((ndo, ", 0x%x", *(tptr+4)));
95                break;
96
97	case DTP_NEIGHBOR_TLV:
98                ND_PRINT((ndo, ", %s", etheraddr_string(ndo, tptr+4)));
99                break;
100
101        default:
102            break;
103        }
104        tptr += len;
105    }
106
107    return;
108
109 trunc:
110    ND_PRINT((ndo, "[|dtp]"));
111}
112
113/*
114 * Local Variables:
115 * c-style: whitesmith
116 * c-basic-offset: 4
117 * End:
118 */
119