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1 /*
2  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
3  *	The Regents of the University of California.  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 distributions
7  * retain the above copyright notice and this paragraph in its entirety, (2)
8  * distributions including binary code include the above copyright notice and
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14  * the University nor the names of its contributors may be used to endorse
15  * or promote products derived from this software without specific prior
16  * written permission.
17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20  */
21 
22 #ifndef lint
23 static const char rcsid[] _U_ =
24     "@(#) $Header: /tcpdump/master/tcpdump/print-rt6.c,v 1.26.2.1 2005/04/20 22:35:11 guy Exp $";
25 #endif
26 
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30 
31 #ifdef INET6
32 
33 #include <tcpdump-stdinc.h>
34 
35 #include <stdio.h>
36 
37 #include "ip6.h"
38 
39 #include "interface.h"
40 #include "addrtoname.h"
41 #include "extract.h"
42 
43 int
rt6_print(register const u_char * bp,const u_char * bp2 _U_)44 rt6_print(register const u_char *bp, const u_char *bp2 _U_)
45 {
46 	register const struct ip6_rthdr *dp;
47 	register const struct ip6_rthdr0 *dp0;
48 	register const u_char *ep;
49 	int i, len;
50 	register const struct in6_addr *addr;
51 
52 	dp = (struct ip6_rthdr *)bp;
53 	len = dp->ip6r_len;
54 
55 	/* 'ep' points to the end of available data. */
56 	ep = snapend;
57 
58 	TCHECK(dp->ip6r_segleft);
59 
60 	printf("srcrt (len=%d", dp->ip6r_len);	/*)*/
61 	printf(", type=%d", dp->ip6r_type);
62 	printf(", segleft=%d", dp->ip6r_segleft);
63 
64 	switch (dp->ip6r_type) {
65 #ifndef IPV6_RTHDR_TYPE_0
66 #define IPV6_RTHDR_TYPE_0 0
67 #endif
68 #ifndef IPV6_RTHDR_TYPE_2
69 #define IPV6_RTHDR_TYPE_2 2
70 #endif
71 	case IPV6_RTHDR_TYPE_0:
72 	case IPV6_RTHDR_TYPE_2:			/* Mobile IPv6 ID-20 */
73 		dp0 = (struct ip6_rthdr0 *)dp;
74 
75 		TCHECK(dp0->ip6r0_reserved);
76 		if (dp0->ip6r0_reserved || vflag) {
77 			printf(", rsv=0x%0x",
78 			    EXTRACT_32BITS(&dp0->ip6r0_reserved));
79 		}
80 
81 		if (len % 2 == 1)
82 			goto trunc;
83 		len >>= 1;
84 		addr = &dp0->ip6r0_addr[0];
85 		for (i = 0; i < len; i++) {
86 			if ((u_char *)(addr + 1) > ep)
87 				goto trunc;
88 
89 			printf(", [%d]%s", i, ip6addr_string(addr));
90 			addr++;
91 		}
92 		/*(*/
93 		printf(") ");
94 		return((dp0->ip6r0_len + 1) << 3);
95 		break;
96 	default:
97 		goto trunc;
98 		break;
99 	}
100 
101  trunc:
102 	fputs("[|srcrt]", stdout);
103 	return -1;
104 }
105 #endif /* INET6 */
106