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#define NETDISSECT_REWORKED
23#ifdef HAVE_CONFIG_H
24#include "config.h"
25#endif
26
27#ifdef INET6
28
29#include <tcpdump-stdinc.h>
30
31#include <string.h>
32
33#include "ip6.h"
34
35#include "interface.h"
36#include "addrtoname.h"
37#include "extract.h"
38
39int
40rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_)
41{
42	register const struct ip6_rthdr *dp;
43	register const struct ip6_rthdr0 *dp0;
44	register const u_char *ep;
45	int i, len;
46	register const struct in6_addr *addr;
47	const struct in6_addr *last_addr = NULL;
48
49	dp = (struct ip6_rthdr *)bp;
50	len = dp->ip6r_len;
51
52	/* 'ep' points to the end of available data. */
53	ep = ndo->ndo_snapend;
54
55	ND_TCHECK(dp->ip6r_segleft);
56
57	ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len));	/*)*/
58	ND_PRINT((ndo, ", type=%d", dp->ip6r_type));
59	ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft));
60
61	switch (dp->ip6r_type) {
62#ifndef IPV6_RTHDR_TYPE_0
63#define IPV6_RTHDR_TYPE_0 0
64#endif
65#ifndef IPV6_RTHDR_TYPE_2
66#define IPV6_RTHDR_TYPE_2 2
67#endif
68	case IPV6_RTHDR_TYPE_0:
69	case IPV6_RTHDR_TYPE_2:			/* Mobile IPv6 ID-20 */
70		dp0 = (struct ip6_rthdr0 *)dp;
71
72		ND_TCHECK(dp0->ip6r0_reserved);
73		if (dp0->ip6r0_reserved || ndo->ndo_vflag) {
74			ND_PRINT((ndo, ", rsv=0x%0x",
75			    EXTRACT_32BITS(&dp0->ip6r0_reserved)));
76		}
77
78		if (len % 2 == 1)
79			goto trunc;
80		len >>= 1;
81		addr = &dp0->ip6r0_addr[0];
82		for (i = 0; i < len; i++) {
83			if ((u_char *)(addr + 1) > ep)
84				goto trunc;
85
86			ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr)));
87			last_addr = addr;
88			addr++;
89		}
90		/*
91		 * the destination address used in the pseudo-header is that of the final
92		 * destination : the last address of the routing header
93		 */
94		if (last_addr != NULL) {
95			struct ip6_hdr *ip6 = (struct ip6_hdr *)bp2;
96			UNALIGNED_MEMCPY(&ip6->ip6_dst, last_addr, sizeof (struct in6_addr));
97		}
98		/*(*/
99		ND_PRINT((ndo, ") "));
100		return((dp0->ip6r0_len + 1) << 3);
101		break;
102	default:
103		goto trunc;
104		break;
105	}
106
107 trunc:
108	ND_PRINT((ndo, "[|srcrt]"));
109	return -1;
110}
111#endif /* INET6 */
112