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   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[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-frag6.c,v 1.14 2002-08-01 08:53:07 risso 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
  42 int
  43 frag6_print(register const u_char *bp, register const u_char *bp2)
  44 {
  45         register const struct ip6_frag *dp;
  46         register const struct ip6_hdr *ip6;
  47         register const u_char *ep;
  48
  49         dp = (const struct ip6_frag *)bp;
  50         ip6 = (const struct ip6_hdr *)bp2;
  51
  52         /* 'ep' points to the end of available data. */
  53         ep = snapend;
  54
  55         TCHECK(dp->ip6f_offlg);
  56
  57         if (vflag) {
  58                 printf("frag (0x%08x:%d|%ld)",
  59                        (u_int32_t)ntohl(dp->ip6f_ident),
  60                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  61                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  62                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  63         } else {
  64                 printf("frag (%d|%ld)",
  65                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  66                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  67                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  68         }
  69
  70 #if 1
  71         /* it is meaningless to decode non-first fragment */
  72         if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0)
  73                 return 65535;
  74         else
  75 #endif
  76         {
  77                 fputs(" ", stdout);
  78                 return sizeof(struct ip6_frag);
  79         }
  80 trunc:
  81         fputs("[|frag]", stdout);
  82         return 65535;
  83 #undef TCHECK
  84 }
  85 #endif /* INET6 */