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 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 #include <net/if.h>
  39
  40 #include <netinet/in.h>
  41 #include <netinet/if_ether.h>
  42 #include <netinet/in_systm.h>
  43 #include <netinet/ip.h>
  44 #include <netinet/ip_icmp.h>
  45 #include <netinet/ip_var.h>
  46 #include <netinet/udp.h>
  47 #include <netinet/udp_var.h>
  48 #include <netinet/tcp.h>
  49
  50 #include <stdio.h>
  51
  52 #include <netinet/ip6.h>
  53
  54 #include "interface.h"
  55 #include "addrtoname.h"
  56
  57 int
  58 frag6_print(register const u_char *bp, register const u_char *bp2)
  59 {
  60         register const struct ip6_frag *dp;
  61         register const struct ip6_hdr *ip6;
  62         register const u_char *ep;
  63
  64 #if 0
  65 #define TCHECK(var) if ((u_char *)&(var) >= ep - sizeof(var)) goto trunc
  66 #endif
  67
  68         dp = (struct ip6_frag *)bp;
  69         ip6 = (struct ip6_hdr *)bp2;
  70
  71         /* 'ep' points to the end of avaible data. */
  72         ep = snapend;
  73
  74         TCHECK(dp->ip6f_offlg);
  75
  76         if (vflag) {
  77                 printf("frag (0x%08x:%d|%d)",
  78                        ntohl(dp->ip6f_ident),
  79                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  80                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  81                                (bp - bp2) - sizeof(struct ip6_frag));
  82         } else {
  83                 printf("frag (%d|%d)",
  84                        ntohs(dp->ip6f_offlg & IP6F_OFF_MASK),
  85                        sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) -
  86                                (bp - bp2) - sizeof(struct ip6_frag));
  87         }
  88
  89 #if 0
  90         /* it is meaningless to decode non-first fragment */
  91         if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0)
  92                 return 65535;
  93         else
  94 #endif
  95         {
  96                 fputs(" ", stdout);
  97                 return sizeof(struct ip6_frag);
  98         }
  99 trunc:
 100         fputs("[|frag]", stdout);
 101         return 65535;
 102 #undef TCHECK
 103 }
 104 #endif /* INET6 */