1/*
2 * Copyright (c) 2001 William C. Fenner.
3 *                All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code
7 * distributions retain the above copyright notice and this paragraph
8 * in its entirety, and (2) distributions including binary code include
9 * the above copyright notice and this paragraph in its entirety in
10 * the documentation or other materials provided with the distribution.
11 * The name of William C. Fenner may not be used to endorse or
12 * promote products derived from this software without specific prior
13 * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
14 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
15 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
16 * FOR A PARTICULAR PURPOSE.
17 */
18
19#define NETDISSECT_REWORKED
20#ifdef HAVE_CONFIG_H
21#include "config.h"
22#endif
23
24#include <tcpdump-stdinc.h>
25
26#include "interface.h"
27#include "addrtoname.h"
28#include "extract.h"
29
30#define MSDP_TYPE_MAX	7
31
32void
33msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)
34{
35	unsigned int type, len;
36
37	ND_TCHECK2(*sp, 3);
38	/* See if we think we're at the beginning of a compound packet */
39	type = *sp;
40	len = EXTRACT_16BITS(sp + 1);
41	if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
42		goto trunc;	/* not really truncated, but still not decodable */
43	ND_PRINT((ndo, " msdp:"));
44	while (length > 0) {
45		ND_TCHECK2(*sp, 3);
46		type = *sp;
47		len = EXTRACT_16BITS(sp + 1);
48		if (len > 1400 || ndo->ndo_vflag)
49			ND_PRINT((ndo, " [len %u]", len));
50		if (len < 3)
51			goto trunc;
52		sp += 3;
53		length -= 3;
54		switch (type) {
55		case 1:	/* IPv4 Source-Active */
56		case 3: /* IPv4 Source-Active Response */
57			if (type == 1)
58				ND_PRINT((ndo, " SA"));
59			else
60				ND_PRINT((ndo, " SA-Response"));
61			ND_TCHECK(*sp);
62			ND_PRINT((ndo, " %u entries", *sp));
63			if ((u_int)((*sp * 12) + 8) < len) {
64				ND_PRINT((ndo, " [w/data]"));
65				if (ndo->ndo_vflag > 1) {
66					ND_PRINT((ndo, " "));
67					ip_print(ndo, sp + *sp * 12 + 8 - 3,
68					         len - (*sp * 12 + 8));
69				}
70			}
71			break;
72		case 2:
73			ND_PRINT((ndo, " SA-Request"));
74			ND_TCHECK2(*sp, 5);
75			ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1)));
76			break;
77		case 4:
78			ND_PRINT((ndo, " Keepalive"));
79			if (len != 3)
80				ND_PRINT((ndo, "[len=%d] ", len));
81			break;
82		case 5:
83			ND_PRINT((ndo, " Notification"));
84			break;
85		default:
86			ND_PRINT((ndo, " [type=%d len=%d]", type, len));
87			break;
88		}
89		sp += (len - 3);
90		length -= (len - 3);
91	}
92	return;
93trunc:
94	ND_PRINT((ndo, " [|msdp]"));
95}
96
97/*
98 * Local Variables:
99 * c-style: whitesmith
100 * c-basic-offset: 8
101 * End:
102 */
103