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
37 void
msdp_print(netdissect_options * ndo,const u_char * sp,u_int length)38 msdp_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;
98 trunc:
99 ND_PRINT((ndo, " [|msdp]"));
100 }
101
102 /*
103 * Local Variables:
104 * c-style: whitesmith
105 * c-basic-offset: 8
106 * End:
107 */
108