The Tcpdump Group git mirrors - tcpdump/blob - print-ip6opts.c

   1 /*
   2  * Copyright (C) 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #ifndef lint
  35 static const char rcsid[] =
  36      "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.5 2000-04-28 11:14:48 itojun Exp $";
  37 #endif
  38
  39 #ifdef INET6
  40 #include <sys/param.h>
  41 #include <sys/time.h>
  42 #include <sys/types.h>
  43 #include <sys/socket.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/ip6.h>
  47
  48 #include <stdio.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52
  53 void
  54 ip6_opt_print(const u_char *bp, int len)
  55 {
  56     int i;
  57     int optlen;
  58
  59     for (i = 0; i < len; i += optlen) {
  60         switch (bp[i]) {
  61 #ifndef IP6OPT_PAD1
  62 #define IP6OPT_PAD1     0x00
  63 #endif
  64         case IP6OPT_PAD1:
  65             optlen = 1;
  66             break;
  67 #ifndef IP6OPT_PADN
  68 #define IP6OPT_PADN     0x01
  69 #endif
  70         case IP6OPT_PADN:
  71 #ifndef IP6OPT_MINLEN
  72 #define IP6OPT_MINLEN   2
  73 #endif
  74             if (len - i < IP6OPT_MINLEN) {
  75                 printf("(padn: trunc)");
  76                 goto trunc;
  77             }
  78             optlen = bp[i + 1] + 2;
  79             break;
  80 #ifndef IP6OPT_RTALERT
  81 #define IP6OPT_RTALERT  0x05
  82 #endif
  83         case IP6OPT_RTALERT:
  84 #ifndef IP6OPT_RTALERT_LEN
  85 #define IP6OPT_RTALERT_LEN      4
  86 #endif
  87             if (len - i < IP6OPT_RTALERT_LEN) {
  88                 printf("(rtalert: trunc)");
  89                 goto trunc;
  90             }
  91             if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
  92                 printf("(rtalert: invalid len %d)", bp[i + 1]);
  93                 goto trunc;
  94             }
  95             printf("(rtalert: 0x%04x) ", ntohs(*(u_int16_t *)&bp[i + 2]));
  96             optlen = IP6OPT_RTALERT_LEN;
  97             break;
  98 #ifndef IP6OPT_JUMBO
  99 #define IP6OPT_JUMBO    0xC2
 100 #endif
 101         case IP6OPT_JUMBO:
 102 #ifndef IP6OPT_JUMBO_LEN
 103 #define IP6OPT_JUMBO_LEN        6
 104 #endif
 105             if (len - i < IP6OPT_JUMBO_LEN) {
 106                 printf("(jumbo: trunc)");
 107                 goto trunc;
 108             }
 109             if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
 110                 printf("(jumbo: invalid len %d)", bp[i + 1]);
 111                 goto trunc;
 112             }
 113             printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 2]));
 114             optlen = IP6OPT_JUMBO_LEN;
 115             break;
 116         default:
 117             if (len - i < IP6OPT_MINLEN) {
 118                 printf("(type %d: trunc)", bp[i]);
 119                 goto trunc;
 120             }
 121             printf("(type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
 122             optlen = bp[i + 1] + 2;
 123             break;
 124         }
 125     }
 126
 127 #if 0
 128 end:
 129 #endif
 130     return;
 131
 132 trunc:
 133     printf("[trunc] ");
 134 }
 135
 136 int
 137 hbhopt_print(register const u_char *bp)
 138 {
 139     const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
 140     register const u_char *ep;
 141     int hbhlen = 0;
 142
 143     /* 'ep' points to the end of avaible data. */
 144     ep = snapend;
 145     TCHECK(dp->ip6h_len);
 146     hbhlen = (int)((dp->ip6h_len + 1) << 3);
 147     TCHECK2(dp, hbhlen);
 148     printf("HBH ");
 149     if (vflag)
 150         ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
 151
 152     return(hbhlen);
 153
 154   trunc:
 155     fputs("[|HBH]", stdout);
 156     return(hbhlen);
 157 }
 158
 159 int
 160 dstopt_print(register const u_char *bp)
 161 {
 162     const struct ip6_dest *dp = (struct ip6_dest *)bp;
 163     register const u_char *ep;
 164     int dstoptlen = 0;
 165
 166     /* 'ep' points to the end of avaible data. */
 167     ep = snapend;
 168     TCHECK(dp->ip6d_len);
 169     dstoptlen = (int)((dp->ip6d_len + 1) << 3);
 170     TCHECK2(dp, dstoptlen);
 171     printf("DSTOPT ");
 172     if (vflag) {
 173         ip6_opt_print((const u_char *)dp + sizeof(*dp),
 174             dstoptlen - sizeof(*dp));
 175     }
 176
 177     return(dstoptlen);
 178
 179   trunc:
 180     fputs("[|DSTOPT]", stdout);
 181     return(dstoptlen);
 182 }
 183 #endif /* INET6 */