dist/tcpdump/print-frag6.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  */
  23
  24 #include <sys/cdefs.h>
  25 #ifndef lint
  26 #if 0
  27 static const char rcsid[] _U_ =
  28     "@(#) Header: /tcpdump/master/tcpdump/print-frag6.c,v 1.19.2.1 2005/04/20 22:33:21 guy Exp";
  29 #else
  30 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  31 #endif
  32 #endif
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 #endif
  37
  38 #ifdef INET6
  39
  40 #include <tcpdump-stdinc.h>
  41
  42 #include <stdio.h>
  43
  44 #include "ip6.h"
  45
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48 #include "extract.h"
  49
  50 int
  51 frag6_print(register const u_char *bp, register const u_char *bp2)
  52 {
  53         register const struct ip6_frag *dp;
  54         register const struct ip6_hdr *ip6;
  55
  56         dp = (const struct ip6_frag *)bp;
  57         ip6 = (const struct ip6_hdr *)bp2;
  58
  59         TCHECK(dp->ip6f_offlg);
  60
  61         if (vflag) {
  62                 printf("frag (0x%08x:%d|%ld)",
  63                        EXTRACT_32BITS(&dp->ip6f_ident),
  64                        EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
  65                        sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
  66                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  67         } else {
  68                 printf("frag (%d|%ld)",
  69                        EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
  70                        sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
  71                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  72         }
  73
  74 #if 1
  75         /* it is meaningless to decode non-first fragment */
  76         if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
  77                 return -1;
  78         else
  79 #endif
  80         {
  81                 fputs(" ", stdout);
  82                 return sizeof(struct ip6_frag);
  83         }
  84 trunc:
  85         fputs("[|frag]", stdout);
  86         return -1;
  87 #undef TCHECK
  88 }
  89 #endif /* INET6 */