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 fragmentation 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 "extract.h"
32
33#include "ip6.h"
34
35int
36frag6_print(netdissect_options *ndo, register const u_char *bp, register const u_char *bp2)
37{
38	register const struct ip6_frag *dp;
39	register const struct ip6_hdr *ip6;
40
41	dp = (const struct ip6_frag *)bp;
42	ip6 = (const struct ip6_hdr *)bp2;
43
44	ND_TCHECK(*dp);
45
46	if (ndo->ndo_vflag) {
47		ND_PRINT((ndo, "frag (0x%08x:%d|%ld)",
48		       EXTRACT_32BITS(&dp->ip6f_ident),
49		       EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
50		       sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
51			       (long)(bp - bp2) - sizeof(struct ip6_frag)));
52	} else {
53		ND_PRINT((ndo, "frag (%d|%ld)",
54		       EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
55		       sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
56			       (long)(bp - bp2) - sizeof(struct ip6_frag)));
57	}
58
59	/* it is meaningless to decode non-first fragment */
60	if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
61		return -1;
62	else
63	{
64		ND_PRINT((ndo, " "));
65		return sizeof(struct ip6_frag);
66	}
67trunc:
68	ND_PRINT((ndo, "[|frag]"));
69	return -1;
70}
71