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 #define NETDISSECT_REWORKED
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #ifdef INET6
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include <string.h>
  32
  33 #include "ip6.h"
  34
  35 #include "interface.h"
  36 #include "addrtoname.h"
  37 #include "extract.h"
  38
  39 int
  40 rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_)
  41 {
  42         register const struct ip6_rthdr *dp;
  43         register const struct ip6_rthdr0 *dp0;
  44         register const u_char *ep;
  45         int i, len;
  46         register const struct in6_addr *addr;
  47         const struct in6_addr *last_addr = NULL;
  48
  49         dp = (struct ip6_rthdr *)bp;
  50         len = dp->ip6r_len;
  51
  52         /* 'ep' points to the end of available data. */
  53         ep = ndo->ndo_snapend;
  54
  55         ND_TCHECK(dp->ip6r_segleft);
  56
  57         ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len)); /*)*/
  58         ND_PRINT((ndo, ", type=%d", dp->ip6r_type));
  59         ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft));
  60
  61         switch (dp->ip6r_type) {
  62 #ifndef IPV6_RTHDR_TYPE_0
  63 #define IPV6_RTHDR_TYPE_0 0
  64 #endif
  65 #ifndef IPV6_RTHDR_TYPE_2
  66 #define IPV6_RTHDR_TYPE_2 2
  67 #endif
  68         case IPV6_RTHDR_TYPE_0:
  69         case IPV6_RTHDR_TYPE_2:                 /* Mobile IPv6 ID-20 */
  70                 dp0 = (struct ip6_rthdr0 *)dp;
  71
  72                 ND_TCHECK(dp0->ip6r0_reserved);
  73                 if (dp0->ip6r0_reserved || ndo->ndo_vflag) {
  74                         ND_PRINT((ndo, ", rsv=0x%0x",
  75                             EXTRACT_32BITS(&dp0->ip6r0_reserved)));
  76                 }
  77
  78                 if (len % 2 == 1)
  79                         goto trunc;
  80                 len >>= 1;
  81                 addr = &dp0->ip6r0_addr[0];
  82                 for (i = 0; i < len; i++) {
  83                         if ((u_char *)(addr + 1) > ep)
  84                                 goto trunc;
  85
  86                         ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr)));
  87                         last_addr = addr;
  88                         addr++;
  89                 }
  90                 /*
  91                  * the destination address used in the pseudo-header is that of the final
  92                  * destination : the last address of the routing header
  93                  */
  94                 if (last_addr != NULL) {
  95                         struct ip6_hdr *ip6 = (struct ip6_hdr *)bp2;
  96                         UNALIGNED_MEMCPY(&ip6->ip6_dst, last_addr, sizeof (struct in6_addr));
  97                 }
  98                 /*(*/
  99                 ND_PRINT((ndo, ") "));
 100                 return((dp0->ip6r0_len + 1) << 3);
 101                 break;
 102         default:
 103                 goto trunc;
 104                 break;
 105         }
 106
 107  trunc:
 108         ND_PRINT((ndo, "[|srcrt]"));
 109         return -1;
 110 }
 111 #endif /* INET6 */