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 #include <sys/cdefs.h>
23 #ifndef lint
24 __RCSID("$NetBSD: print-frag6.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
25 #endif
26
27 #define NETDISSECT_REWORKED
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #ifdef INET6
33
34 #include <tcpdump-stdinc.h>
35
36 #include "ip6.h"
37 #include "interface.h"
38 #include "extract.h"
39
40 int
frag6_print(netdissect_options * ndo,register const u_char * bp,register const u_char * bp2)41 frag6_print(netdissect_options *ndo, register const u_char *bp, register const u_char *bp2)
42 {
43 register const struct ip6_frag *dp;
44 register const struct ip6_hdr *ip6;
45
46 dp = (const struct ip6_frag *)bp;
47 ip6 = (const struct ip6_hdr *)bp2;
48
49 ND_TCHECK(dp->ip6f_offlg);
50
51 if (ndo->ndo_vflag) {
52 ND_PRINT((ndo, "frag (0x%08x:%d|%ld)",
53 EXTRACT_32BITS(&dp->ip6f_ident),
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 } else {
58 ND_PRINT((ndo, "frag (%d|%ld)",
59 EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
60 sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
61 (long)(bp - bp2) - sizeof(struct ip6_frag)));
62 }
63
64 /* it is meaningless to decode non-first fragment */
65 if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
66 return -1;
67 else
68 {
69 ND_PRINT((ndo, " "));
70 return sizeof(struct ip6_frag);
71 }
72 trunc:
73 ND_PRINT((ndo, "[|frag]"));
74 return -1;
75 }
76 #endif /* INET6 */
77