The Tcpdump Group git mirrors - tcpdump/blob - 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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #ifdef INET6
  27
  28 #include <tcpdump-stdinc.h>
  29
  30 #include <stdio.h>
  31
  32 #include "ip6.h"
  33
  34 #include "interface.h"
  35 #include "extract.h"
  36
  37 int
  38 frag6_print(register const u_char *bp, register const u_char *bp2)
  39 {
  40         register const struct ip6_frag *dp;
  41         register const struct ip6_hdr *ip6;
  42
  43         dp = (const struct ip6_frag *)bp;
  44         ip6 = (const struct ip6_hdr *)bp2;
  45
  46         TCHECK(dp->ip6f_offlg);
  47
  48         if (vflag) {
  49                 printf("frag (0x%08x:%d|%ld)",
  50                        EXTRACT_32BITS(&dp->ip6f_ident),
  51                        EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
  52                        sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
  53                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  54         } else {
  55                 printf("frag (%d|%ld)",
  56                        EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK,
  57                        sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen) -
  58                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  59         }
  60
  61 #if 1
  62         /* it is meaningless to decode non-first fragment */
  63         if ((EXTRACT_16BITS(&dp->ip6f_offlg) & IP6F_OFF_MASK) != 0)
  64                 return -1;
  65         else
  66 #endif
  67         {
  68                 fputs(" ", stdout);
  69                 return sizeof(struct ip6_frag);
  70         }
  71 trunc:
  72         fputs("[|frag]", stdout);
  73         return -1;
  74 #undef TCHECK
  75 }
  76 #endif /* INET6 */