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     "@(#) /master/usr.sbin/tcpdump/tcpdump/print-icmp.c,v 2.1 1995/02/03 18:14:42 polk Exp (LBL)";
  25 #endif
  26
  27 #ifdef INET6
  28
  29 #include <sys/param.h>
  30 #include <sys/time.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33
  34 #include <net/if.h>
  35
  36 #include <netinet/in.h>
  37 #include <netinet/if_ether.h>
  38 #include <netinet/in_systm.h>
  39 #include <netinet/ip.h>
  40 #include <netinet/ip_icmp.h>
  41 #include <netinet/ip_var.h>
  42 #include <netinet/udp.h>
  43 #include <netinet/udp_var.h>
  44 #include <netinet/tcp.h>
  45
  46 #include <stdio.h>
  47
  48 #include <netinet/ip6.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52
  53 int
  54 frag6_print(register const u_char *bp, register const u_char *bp2)
  55 {
  56         register const struct ip6_frag *dp;
  57         register const struct ip6_hdr *ip6;
  58         register const u_char *ep;
  59
  60 #if 0
  61 #define TCHECK(var) if ((u_char *)&(var) >= ep - sizeof(var)) goto trunc
  62 #endif
  63
  64         dp = (struct ip6_frag *)bp;
  65         ip6 = (struct ip6_hdr *)bp2;
  66
  67         /* 'ep' points to the end of avaible data. */
  68         ep = snapend;
  69
  70         TCHECK(dp->ip6f_offlg);
  71
  72         if (vflag) {
  73                 printf("frag (0x%08x:%d|%d)",
  74                        ntohl(dp->ip6f_ident),
  75                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  76                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  77                                (bp - bp2) - sizeof(struct ip6_frag));
  78         } else {
  79                 printf("frag (%d|%d)",
  80                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  81                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  82                                (bp - bp2) - sizeof(struct ip6_frag));
  83         }
  84
  85 #if 0
  86         /* it is meaningless to decode non-first fragment */
  87         if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0)
  88                 return 65535;
  89         else
  90 #endif
  91         {
  92                 fputs(" ", stdout);
  93                 return sizeof(struct ip6_frag);
  94         }
  95 trunc:
  96         fputs("[|frag]", stdout);
  97         return 65535;
  98 #undef TCHECK
  99 }
 100 #endif /* INET6 */