contrib/tcpdump-3.8.3/print-frag6.c

   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
  23 static const char rcsid[] _U_ =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-frag6.c,v 1.16.2.3 2003/11/19 00:35:43 guy Exp $";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #ifdef INET6
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #include <stdio.h>
  36
  37 #include "ip6.h"
  38
  39 #include "interface.h"
  40 #include "addrtoname.h"
  41 #include "extract.h"
  42
  43 int
  44 frag6_print(register const u_char *bp, register const u_char *bp2)
  45 {
  46         register const struct ip6_frag *dp;
  47         register const struct ip6_hdr *ip6;
  48         register const u_char *ep;
  49
  50         dp = (const struct ip6_frag *)bp;
  51         ip6 = (const struct ip6_hdr *)bp2;
  52
  53         /* 'ep' points to the end of available data. */
  54         ep = snapend;
  55
  56         TCHECK(dp->ip6f_offlg);
  57
  58         if (vflag) {
  59                 printf("frag (0x%08x:%d|%ld)",
  60                        EXTRACT_32BITS(&dp->ip6f_ident),
  61                        EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
  62                        sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
  63                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  64         } else {
  65                 printf("frag (%d|%ld)",
  66                        EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
  67                        sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
  68                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  69         }
  70
  71 #if 1
  72         /* it is meaningless to decode non-first fragment */
  73         if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
  74                 return -1;
  75         else
  76 #endif
  77         {
  78                 fputs(" ", stdout);
  79                 return sizeof(struct ip6_frag);
  80         }
  81 trunc:
  82         fputs("[|frag]", stdout);
  83         return -1;
  84 #undef TCHECK
  85 }
  86 #endif /* INET6 */