print-frag6.c revision 75115 
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
23static const char rcsid[] =
24    "@(#) $Header: /tcpdump/master/tcpdump/print-frag6.c,v 1.12 2000/10/07 05:53:10 itojun Exp $";
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#ifdef INET6
32
33#include <sys/param.h>
34#include <sys/time.h>
35#include <sys/types.h>
36#include <sys/socket.h>
37
38
39#include <netinet/in.h>
40
41#include <stdio.h>
42
43#include "ip6.h"
44
45#include "interface.h"
46#include "addrtoname.h"
47
48int
49frag6_print(register const u_char *bp, register const u_char *bp2)
50{
51	register const struct ip6_frag *dp;
52	register const struct ip6_hdr *ip6;
53	register const u_char *ep;
54
55#if 0
56#define TCHECK(var) if ((u_char *)&(var) >= ep - sizeof(var)) goto trunc
57#endif
58
59	dp = (struct ip6_frag *)bp;
60	ip6 = (struct ip6_hdr *)bp2;
61
62	/* 'ep' points to the end of available data. */
63	ep = snapend;
64
65	TCHECK(dp->ip6f_offlg);
66
67	if (vflag) {
68		printf("frag (0x%08x:%d|%ld)",
69		       (u_int32_t)ntohl(dp->ip6f_ident),
70		       ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
71		       sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
72			       (long)(bp - bp2) - sizeof(struct ip6_frag));
73	} else {
74		printf("frag (%d|%ld)",
75		       ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
76		       sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
77			       (long)(bp - bp2) - sizeof(struct ip6_frag));
78	}
79
80#if 1
81	/* it is meaningless to decode non-first fragment */
82	if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0)
83		return 65535;
84	else
85#endif
86	{
87		fputs(" ", stdout);
88		return sizeof(struct ip6_frag);
89	}
90trunc:
91	fputs("[|frag]", stdout);
92	return 65535;
93#undef TCHECK
94}
95#endif /* INET6 */
96