The Tcpdump Group git mirrors - tcpdump/blob - print-rt6.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 #include <netdissect-stdinc.h>
  27
  28 #include <string.h>
  29
  30 #include "ip6.h"
  31
  32 #include "netdissect.h"
  33 #include "addrtoname.h"
  34 #include "extract.h"
  35
  36 int
  37 rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_)
  38 {
  39         register const struct ip6_rthdr *dp;
  40         register const struct ip6_rthdr0 *dp0;
  41         register const u_char *ep;
  42         int i, len;
  43         register const struct in6_addr *addr;
  44
  45         dp = (const struct ip6_rthdr *)bp;
  46         len = dp->ip6r_len;
  47
  48         /* 'ep' points to the end of available data. */
  49         ep = ndo->ndo_snapend;
  50
  51         ND_TCHECK(dp->ip6r_segleft);
  52
  53         ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len)); /*)*/
  54         ND_PRINT((ndo, ", type=%d", dp->ip6r_type));
  55         ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft));
  56
  57         switch (dp->ip6r_type) {
  58         case IPV6_RTHDR_TYPE_0:
  59         case IPV6_RTHDR_TYPE_2:                 /* Mobile IPv6 ID-20 */
  60                 dp0 = (const struct ip6_rthdr0 *)dp;
  61
  62                 ND_TCHECK(dp0->ip6r0_reserved);
  63                 if (dp0->ip6r0_reserved || ndo->ndo_vflag) {
  64                         ND_PRINT((ndo, ", rsv=0x%0x",
  65                             EXTRACT_32BITS(&dp0->ip6r0_reserved)));
  66                 }
  67
  68                 if (len % 2 == 1)
  69                         goto trunc;
  70                 len >>= 1;
  71                 addr = &dp0->ip6r0_addr[0];
  72                 for (i = 0; i < len; i++) {
  73                         if ((const u_char *)(addr + 1) > ep)
  74                                 goto trunc;
  75
  76                         ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr)));
  77                         addr++;
  78                 }
  79                 /*(*/
  80                 ND_PRINT((ndo, ") "));
  81                 return((dp0->ip6r0_len + 1) << 3);
  82                 break;
  83         default:
  84                 goto trunc;
  85                 break;
  86         }
  87
  88  trunc:
  89         ND_PRINT((ndo, "[|srcrt]"));
  90         return -1;
  91 }