external/bsd/tcpdump/dist/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 #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
  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 */