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 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-frag6.c,v 1.9 2000-09-28 06:42:59 guy Exp $";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #ifdef INET6
  32
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37
  38
  39 #include <netinet/in.h>
  40 #include <netinet/in_systm.h>
  41
  42 #include <stdio.h>
  43
  44 #include <netinet/ip6.h>
  45
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48
  49 int
  50 frag6_print(register const u_char *bp, register const u_char *bp2)
  51 {
  52         register const struct ip6_frag *dp;
  53         register const struct ip6_hdr *ip6;
  54         register const u_char *ep;
  55
  56 #if 0
  57 #define TCHECK(var) if ((u_char *)&(var) >= ep - sizeof(var)) goto trunc
  58 #endif
  59
  60         dp = (struct ip6_frag *)bp;
  61         ip6 = (struct ip6_hdr *)bp2;
  62
  63         /* 'ep' points to the end of avaible data. */
  64         ep = snapend;
  65
  66         TCHECK(dp->ip6f_offlg);
  67
  68         if (vflag) {
  69                 printf("frag (0x%08x:%d|%ld)",
  70                        (u_int32_t)ntohl(dp->ip6f_ident),
  71                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  72                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  73                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  74         } else {
  75                 printf("frag (%d|%ld)",
  76                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  77                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  78                                (long)(bp - bp2) - sizeof(struct ip6_frag));
  79         }
  80
  81 #if 1
  82         /* it is meaningless to decode non-first fragment */
  83         if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0)
  84                 return 65535;
  85         else
  86 #endif
  87         {
  88                 fputs(" ", stdout);
  89                 return sizeof(struct ip6_frag);
  90         }
  91 trunc:
  92         fputs("[|frag]", stdout);
  93         return 65535;
  94 #undef TCHECK
  95 }
  96 #endif /* INET6 */