print-msdp.c revision 1.4 
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#include <sys/cdefs.h>
20#ifndef lint
21__RCSID("$NetBSD: print-msdp.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
22#endif
23
24#define NETDISSECT_REWORKED
25#ifdef HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <tcpdump-stdinc.h>
30
31#include "interface.h"
32#include "addrtoname.h"
33#include "extract.h"
34
35#define MSDP_TYPE_MAX	7
36
37void
38msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)
39{
40	unsigned int type, len;
41
42	ND_TCHECK2(*sp, 3);
43	/* See if we think we're at the beginning of a compound packet */
44	type = *sp;
45	len = EXTRACT_16BITS(sp + 1);
46	if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
47		goto trunc;	/* not really truncated, but still not decodable */
48	ND_PRINT((ndo, " msdp:"));
49	while (length > 0) {
50		ND_TCHECK2(*sp, 3);
51		type = *sp;
52		len = EXTRACT_16BITS(sp + 1);
53		if (len > 1400 || ndo->ndo_vflag)
54			ND_PRINT((ndo, " [len %u]", len));
55		if (len < 3)
56			goto trunc;
57		sp += 3;
58		length -= 3;
59		switch (type) {
60		case 1:	/* IPv4 Source-Active */
61		case 3: /* IPv4 Source-Active Response */
62			if (type == 1)
63				ND_PRINT((ndo, " SA"));
64			else
65				ND_PRINT((ndo, " SA-Response"));
66			ND_TCHECK(*sp);
67			ND_PRINT((ndo, " %u entries", *sp));
68			if ((u_int)((*sp * 12) + 8) < len) {
69				ND_PRINT((ndo, " [w/data]"));
70				if (ndo->ndo_vflag > 1) {
71					ND_PRINT((ndo, " "));
72					ip_print(ndo, sp + *sp * 12 + 8 - 3,
73					         len - (*sp * 12 + 8));
74				}
75			}
76			break;
77		case 2:
78			ND_PRINT((ndo, " SA-Request"));
79			ND_TCHECK2(*sp, 5);
80			ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1)));
81			break;
82		case 4:
83			ND_PRINT((ndo, " Keepalive"));
84			if (len != 3)
85				ND_PRINT((ndo, "[len=%d] ", len));
86			break;
87		case 5:
88			ND_PRINT((ndo, " Notification"));
89			break;
90		default:
91			ND_PRINT((ndo, " [type=%d len=%d]", type, len));
92			break;
93		}
94		sp += (len - 3);
95		length -= (len - 3);
96	}
97	return;
98trunc:
99	ND_PRINT((ndo, " [|msdp]"));
100}
101
102/*
103 * Local Variables:
104 * c-style: whitesmith
105 * c-basic-offset: 8
106 * End:
107 */
108