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 1.3 2000-01-09 21:34:18 fenner 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         case IP6OPT_PAD1:
  62             optlen = 1;
  63             break;
  64         case IP6OPT_PADN:
  65             if (len - i < IP6OPT_MINLEN) {
  66                 printf("(padn: trunc)");
  67                 goto trunc;
  68             }
  69             optlen = bp[i + 1] + 2;
  70             break;
  71         case IP6OPT_RTALERT:
  72             if (len - i < IP6OPT_RTALERT_LEN) {
  73                 printf("(rtalert: trunc)");
  74                 goto trunc;
  75             }
  76             if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
  77                 printf("(rtalert: invalid len %d)", bp[i + 1]);
  78                 goto trunc;
  79             }
  80             printf("(rtalert: 0x%04x) ", ntohs(*(u_short *)&bp[i + 2]));
  81             optlen = IP6OPT_RTALERT_LEN;
  82             break;
  83         case IP6OPT_JUMBO:
  84             if (len - i < IP6OPT_JUMBO_LEN) {
  85                 printf("(jumbo: trunc)");
  86                 goto trunc;
  87             }
  88             if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
  89                 printf("(jumbo: invalid len %d)", bp[i + 1]);
  90                 goto trunc;
  91             }
  92             printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int *)&bp[i + 2]));
  93             optlen = IP6OPT_JUMBO_LEN;
  94             break;
  95         default:
  96             if (len - i < IP6OPT_MINLEN) {
  97                 printf("(type %d: trunc)", bp[i]);
  98                 goto trunc;
  99             }
 100             printf("(type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
 101             optlen = bp[i + 1] + 2;
 102             break;
 103         }
 104     }
 105
 106 #if 0
 107 end:
 108 #endif
 109     return;
 110
 111 trunc:
 112     printf("[trunc] ");
 113 }
 114
 115 int
 116 hbhopt_print(register const u_char *bp)
 117 {
 118     const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
 119     register const u_char *ep;
 120     int hbhlen = 0;
 121
 122     /* 'ep' points to the end of avaible data. */
 123     ep = snapend;
 124     TCHECK(dp->ip6h_len);
 125     hbhlen = (int)((dp->ip6h_len + 1) << 3);
 126     TCHECK2(dp, hbhlen);
 127     printf("HBH ");
 128     if (vflag)
 129         ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
 130
 131     return(hbhlen);
 132
 133   trunc:
 134     fputs("[|HBH]", stdout);
 135     return(hbhlen);
 136 }
 137
 138 int
 139 dstopt_print(register const u_char *bp)
 140 {
 141     const struct ip6_dest *dp = (struct ip6_dest *)bp;
 142     register const u_char *ep;
 143     int dstoptlen = 0;
 144
 145     /* 'ep' points to the end of avaible data. */
 146     ep = snapend;
 147     TCHECK(dp->ip6d_len);
 148     dstoptlen = (int)((dp->ip6d_len + 1) << 3);
 149     TCHECK2(dp, dstoptlen);
 150     printf("DSTOPT ");
 151     if (vflag) {
 152         ip6_opt_print((const u_char *)dp + sizeof(*dp),
 153             dstoptlen - sizeof(*dp));
 154     }
 155
 156     return(dstoptlen);
 157
 158   trunc:
 159     fputs("[|DSTOPT]", stdout);
 160     return(dstoptlen);
 161 }
 162 #endif /* INET6 */