external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: print-rt6.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  25 #endif
  26
  27 #define NETDISSECT_REWORKED
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #ifdef INET6
  33
  34 #include <tcpdump-stdinc.h>
  35
  36 #include <string.h>
  37
  38 #include "ip6.h"
  39
  40 #include "interface.h"
  41 #include "addrtoname.h"
  42 #include "extract.h"
  43
  44 int
  45 rt6_print(netdissect_options *ndo, register const u_char *bp, const u_char *bp2 _U_)
  46 {
  47         register const struct ip6_rthdr *dp;
  48         register const struct ip6_rthdr0 *dp0;
  49         register const u_char *ep;
  50         int i, len;
  51         register const struct in6_addr *addr;
  52         const struct in6_addr *last_addr = NULL;
  53
  54         dp = (struct ip6_rthdr *)bp;
  55         len = dp->ip6r_len;
  56
  57         /* 'ep' points to the end of available data. */
  58         ep = ndo->ndo_snapend;
  59
  60         ND_TCHECK(dp->ip6r_segleft);
  61
  62         ND_PRINT((ndo, "srcrt (len=%d", dp->ip6r_len)); /*)*/
  63         ND_PRINT((ndo, ", type=%d", dp->ip6r_type));
  64         ND_PRINT((ndo, ", segleft=%d", dp->ip6r_segleft));
  65
  66         switch (dp->ip6r_type) {
  67 #ifndef IPV6_RTHDR_TYPE_0
  68 #define IPV6_RTHDR_TYPE_0 0
  69 #endif
  70 #ifndef IPV6_RTHDR_TYPE_2
  71 #define IPV6_RTHDR_TYPE_2 2
  72 #endif
  73         case IPV6_RTHDR_TYPE_0:
  74         case IPV6_RTHDR_TYPE_2:                 /* Mobile IPv6 ID-20 */
  75                 dp0 = (struct ip6_rthdr0 *)dp;
  76
  77                 ND_TCHECK(dp0->ip6r0_reserved);
  78                 if (dp0->ip6r0_reserved || ndo->ndo_vflag) {
  79                         ND_PRINT((ndo, ", rsv=0x%0x",
  80                             EXTRACT_32BITS(&dp0->ip6r0_reserved)));
  81                 }
  82
  83                 if (len % 2 == 1)
  84                         goto trunc;
  85                 len >>= 1;
  86                 addr = &dp0->ip6r0_addr[0];
  87                 for (i = 0; i < len; i++) {
  88                         if ((u_char *)(addr + 1) > ep)
  89                                 goto trunc;
  90
  91                         ND_PRINT((ndo, ", [%d]%s", i, ip6addr_string(ndo, addr)));
  92                         last_addr = addr;
  93                         addr++;
  94                 }
  95                 /*
  96                  * the destination address used in the pseudo-header is that of the final
  97                  * destination : the last address of the routing header
  98                  */
  99                 if (last_addr != NULL) {
 100                         struct ip6_hdr *ip6 = (struct ip6_hdr *)bp2;
 101                         UNALIGNED_MEMCPY(&ip6->ip6_dst, last_addr, sizeof (struct in6_addr));
 102                 }
 103                 /*(*/
 104                 ND_PRINT((ndo, ") "));
 105                 return((dp0->ip6r0_len + 1) << 3);
 106                 break;
 107         default:
 108                 goto trunc;
 109                 break;
 110         }
 111
 112  trunc:
 113         ND_PRINT((ndo, "[|srcrt]"));
 114         return -1;
 115 }
 116 #endif /* INET6 */