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, const u_char *bp, const u_char *bp2)
37{
38	const struct ip6_frag *dp;
39	const struct ip6_hdr *ip6;
40
41	ndo->ndo_protocol = "frag6";
42	dp = (const struct ip6_frag *)bp;
43	ip6 = (const struct ip6_hdr *)bp2;
44
45	if (ndo->ndo_vflag) {
46		ND_PRINT("frag (0x%08x:%u|%zu)",
47			 GET_BE_U_4(dp->ip6f_ident),
48			 GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK,
49			 sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen) -
50			        (bp - bp2) - sizeof(struct ip6_frag));
51	} else {
52		ND_PRINT("frag (%u|%zu)",
53		         GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK,
54		         sizeof(struct ip6_hdr) + GET_BE_U_2(ip6->ip6_plen) -
55			         (bp - bp2) - sizeof(struct ip6_frag));
56	}
57
58	/* it is meaningless to decode non-first fragment */
59	if ((GET_BE_U_2(dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
60		return -1;
61	else
62	{
63		ND_PRINT(" ");
64		return sizeof(struct ip6_frag);
65	}
66}
67