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/* \summary: IPv6 routing header printer */
23
24#ifdef HAVE_CONFIG_H
25#include <config.h>
26#endif
27
28#include "netdissect-stdinc.h"
29
30#include "netdissect.h"
31#include "addrtoname.h"
32#include "extract.h"
33
34#include "ip6.h"
35
36int
37rt6_print(netdissect_options *ndo, const u_char *bp, const u_char *bp2 _U_)
38{
39	const struct ip6_rthdr *dp;
40	const struct ip6_rthdr0 *dp0;
41	const struct ip6_srh *srh;
42	u_int i, len, type;
43	const u_char *p;
44
45	ndo->ndo_protocol = "rt6";
46
47	nd_print_protocol_caps(ndo);
48	dp = (const struct ip6_rthdr *)bp;
49
50	len = GET_U_1(dp->ip6r_len);
51	ND_PRINT(" (len=%u", len);	/*)*/
52	type = GET_U_1(dp->ip6r_type);
53	ND_PRINT(", type=%u", type);
54	if (type == IPV6_RTHDR_TYPE_0)
55		ND_PRINT(" [Deprecated]");
56	ND_PRINT(", segleft=%u", GET_U_1(dp->ip6r_segleft));
57
58	switch (type) {
59	case IPV6_RTHDR_TYPE_0:
60	case IPV6_RTHDR_TYPE_2:			/* Mobile IPv6 ID-20 */
61		dp0 = (const struct ip6_rthdr0 *)dp;
62
63		if (GET_BE_U_4(dp0->ip6r0_reserved) || ndo->ndo_vflag) {
64			ND_PRINT(", rsv=0x%0x",
65			    GET_BE_U_4(dp0->ip6r0_reserved));
66		}
67
68		if (len % 2 == 1) {
69			ND_PRINT(" (invalid length %u)", len);
70			goto invalid;
71		}
72		len >>= 1;
73		p = (const u_char *) dp0->ip6r0_addr;
74		for (i = 0; i < len; i++) {
75			ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p));
76			p += 16;
77		}
78		/*(*/
79		ND_PRINT(") ");
80		return((GET_U_1(dp0->ip6r0_len) + 1) << 3);
81		break;
82	case IPV6_RTHDR_TYPE_4:
83		srh = (const struct ip6_srh *)dp;
84		ND_PRINT(", last-entry=%u", GET_U_1(srh->srh_last_ent));
85
86		if (GET_U_1(srh->srh_flags) || ndo->ndo_vflag) {
87			ND_PRINT(", flags=0x%0x",
88				GET_U_1(srh->srh_flags));
89		}
90
91		ND_PRINT(", tag=%x", GET_BE_U_2(srh->srh_tag));
92
93		if (len % 2 == 1) {
94			ND_PRINT(" (invalid length %u)", len);
95			goto invalid;
96		}
97		len >>= 1;
98		p  = (const u_char *) srh->srh_segments;
99		for (i = 0; i < len; i++) {
100			ND_PRINT(", [%u]%s", i, GET_IP6ADDR_STRING(p));
101			p += 16;
102		}
103		/*(*/
104		ND_PRINT(") ");
105		return((GET_U_1(srh->srh_len) + 1) << 3);
106		break;
107	default:
108		ND_PRINT(" (unknown type)");
109		goto invalid;
110	}
111
112invalid:
113	nd_print_invalid(ndo);
114	return -1;
115}
116