xref: /minix3/external/bsd/tcpdump/dist/print-frag6.c (revision b636d99d91c3d54204248f643c14627405d4afd1)
1*b636d99dSDavid van Moolenbroek /*
2*b636d99dSDavid van Moolenbroek  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
3*b636d99dSDavid van Moolenbroek  *	The Regents of the University of California.  All rights reserved.
4*b636d99dSDavid van Moolenbroek  *
5*b636d99dSDavid van Moolenbroek  * Redistribution and use in source and binary forms, with or without
6*b636d99dSDavid van Moolenbroek  * modification, are permitted provided that: (1) source code distributions
7*b636d99dSDavid van Moolenbroek  * retain the above copyright notice and this paragraph in its entirety, (2)
8*b636d99dSDavid van Moolenbroek  * distributions including binary code include the above copyright notice and
9*b636d99dSDavid van Moolenbroek  * this paragraph in its entirety in the documentation or other materials
10*b636d99dSDavid van Moolenbroek  * provided with the distribution, and (3) all advertising materials mentioning
11*b636d99dSDavid van Moolenbroek  * features or use of this software display the following acknowledgement:
12*b636d99dSDavid van Moolenbroek  * ``This product includes software developed by the University of California,
13*b636d99dSDavid van Moolenbroek  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14*b636d99dSDavid van Moolenbroek  * the University nor the names of its contributors may be used to endorse
15*b636d99dSDavid van Moolenbroek  * or promote products derived from this software without specific prior
16*b636d99dSDavid van Moolenbroek  * written permission.
17*b636d99dSDavid van Moolenbroek  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18*b636d99dSDavid van Moolenbroek  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19*b636d99dSDavid van Moolenbroek  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20*b636d99dSDavid van Moolenbroek  */
21*b636d99dSDavid van Moolenbroek 
22*b636d99dSDavid van Moolenbroek #include <sys/cdefs.h>
23*b636d99dSDavid van Moolenbroek #ifndef lint
24*b636d99dSDavid van Moolenbroek __RCSID("$NetBSD: print-frag6.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
25*b636d99dSDavid van Moolenbroek #endif
26*b636d99dSDavid van Moolenbroek 
27*b636d99dSDavid van Moolenbroek #define NETDISSECT_REWORKED
28*b636d99dSDavid van Moolenbroek #ifdef HAVE_CONFIG_H
29*b636d99dSDavid van Moolenbroek #include "config.h"
30*b636d99dSDavid van Moolenbroek #endif
31*b636d99dSDavid van Moolenbroek 
32*b636d99dSDavid van Moolenbroek #ifdef INET6
33*b636d99dSDavid van Moolenbroek 
34*b636d99dSDavid van Moolenbroek #include <tcpdump-stdinc.h>
35*b636d99dSDavid van Moolenbroek 
36*b636d99dSDavid van Moolenbroek #include "ip6.h"
37*b636d99dSDavid van Moolenbroek #include "interface.h"
38*b636d99dSDavid van Moolenbroek #include "extract.h"
39*b636d99dSDavid van Moolenbroek 
40*b636d99dSDavid van Moolenbroek int
frag6_print(netdissect_options * ndo,register const u_char * bp,register const u_char * bp2)41*b636d99dSDavid van Moolenbroek frag6_print(netdissect_options *ndo, register const u_char *bp, register const u_char *bp2)
42*b636d99dSDavid van Moolenbroek {
43*b636d99dSDavid van Moolenbroek 	register const struct ip6_frag *dp;
44*b636d99dSDavid van Moolenbroek 	register const struct ip6_hdr *ip6;
45*b636d99dSDavid van Moolenbroek 
46*b636d99dSDavid van Moolenbroek 	dp = (const struct ip6_frag *)bp;
47*b636d99dSDavid van Moolenbroek 	ip6 = (const struct ip6_hdr *)bp2;
48*b636d99dSDavid van Moolenbroek 
49*b636d99dSDavid van Moolenbroek 	ND_TCHECK(dp->ip6f_offlg);
50*b636d99dSDavid van Moolenbroek 
51*b636d99dSDavid van Moolenbroek 	if (ndo->ndo_vflag) {
52*b636d99dSDavid van Moolenbroek 		ND_PRINT((ndo, "frag (0x%08x:%d|%ld)",
53*b636d99dSDavid van Moolenbroek 		       EXTRACT_32BITS(&dp->ip6f_ident),
54*b636d99dSDavid van Moolenbroek 		       EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
55*b636d99dSDavid van Moolenbroek 		       sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
56*b636d99dSDavid van Moolenbroek 			       (long)(bp - bp2) - sizeof(struct ip6_frag)));
57*b636d99dSDavid van Moolenbroek 	} else {
58*b636d99dSDavid van Moolenbroek 		ND_PRINT((ndo, "frag (%d|%ld)",
59*b636d99dSDavid van Moolenbroek 		       EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
60*b636d99dSDavid van Moolenbroek 		       sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
61*b636d99dSDavid van Moolenbroek 			       (long)(bp - bp2) - sizeof(struct ip6_frag)));
62*b636d99dSDavid van Moolenbroek 	}
63*b636d99dSDavid van Moolenbroek 
64*b636d99dSDavid van Moolenbroek 	/* it is meaningless to decode non-first fragment */
65*b636d99dSDavid van Moolenbroek 	if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
66*b636d99dSDavid van Moolenbroek 		return -1;
67*b636d99dSDavid van Moolenbroek 	else
68*b636d99dSDavid van Moolenbroek 	{
69*b636d99dSDavid van Moolenbroek 		ND_PRINT((ndo, " "));
70*b636d99dSDavid van Moolenbroek 		return sizeof(struct ip6_frag);
71*b636d99dSDavid van Moolenbroek 	}
72*b636d99dSDavid van Moolenbroek trunc:
73*b636d99dSDavid van Moolenbroek 	ND_PRINT((ndo, "[|frag]"));
74*b636d99dSDavid van Moolenbroek 	return -1;
75*b636d99dSDavid van Moolenbroek }
76*b636d99dSDavid van Moolenbroek #endif /* INET6 */
77