dist/tcpdump/print-mobility.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2002 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static const char rcsid[] _U_ =
  40      "@(#) Header: /tcpdump/master/tcpdump/print-mobility.c,v 1.11.2.1 2005/04/20 22:21:16 guy Exp";
  41 #else
  42 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  43 #endif
  44 #endif
  45
  46 #ifdef INET6
  47 #include <tcpdump-stdinc.h>
  48
  49 #include <stdio.h>
  50
  51 #include "ip6.h"
  52
  53 #include "interface.h"
  54 #include "addrtoname.h"
  55 #include "extract.h"            /* must come after interface.h */
  56
  57 /* Mobility header */
  58 struct ip6_mobility {
  59         u_int8_t ip6m_pproto;   /* following payload protocol (for PG) */
  60         u_int8_t ip6m_len;      /* length in units of 8 octets */
  61         u_int8_t ip6m_type;     /* message type */
  62         u_int8_t reserved;      /* reserved */
  63         u_int16_t ip6m_cksum;   /* sum of IPv6 pseudo-header and MH */
  64         union {
  65                 u_int16_t       ip6m_un_data16[1]; /* type-specific field */
  66                 u_int8_t        ip6m_un_data8[2];  /* type-specific fiedl */
  67         } ip6m_dataun;
  68 };
  69
  70 #define ip6m_data16     ip6m_dataun.ip6m_un_data16
  71 #define ip6m_data8      ip6m_dataun.ip6m_un_data8
  72
  73 #define IP6M_MINLEN     8
  74
  75 /* message type */
  76 #define IP6M_BINDING_REQUEST    0       /* Binding Refresh Request */
  77 #define IP6M_HOME_TEST_INIT     1       /* Home Test Init */
  78 #define IP6M_CAREOF_TEST_INIT   2       /* Care-of Test Init */
  79 #define IP6M_HOME_TEST          3       /* Home Test */
  80 #define IP6M_CAREOF_TEST        4       /* Care-of Test */
  81 #define IP6M_BINDING_UPDATE     5       /* Binding Update */
  82 #define IP6M_BINDING_ACK        6       /* Binding Acknowledgement */
  83 #define IP6M_BINDING_ERROR      7       /* Binding Error */
  84
  85 /* Mobility Header Options */
  86 #define IP6MOPT_MINLEN          2
  87 #define IP6MOPT_PAD1          0x0       /* Pad1 */
  88 #define IP6MOPT_PADN          0x1       /* PadN */
  89 #define IP6MOPT_REFRESH       0x2       /* Binding Refresh Advice */
  90 #define IP6MOPT_REFRESH_MINLEN  4
  91 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
  92 #define IP6MOPT_ALTCOA_MINLEN  18
  93 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
  94 #define IP6MOPT_NONCEID_MINLEN  6
  95 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
  96 #define IP6MOPT_AUTH_MINLEN    12
  97
  98 static void
  99 mobility_opt_print(const u_char *bp, int len)
 100 {
 101         int i;
 102         int optlen;
 103
 104         for (i = 0; i < len; i += optlen) {
 105                 if (bp[i] == IP6MOPT_PAD1)
 106                         optlen = 1;
 107                 else {
 108                         if (i + 1 < len)
 109                                 optlen = bp[i + 1] + 2;
 110                         else
 111                                 goto trunc;
 112                 }
 113                 if (i + optlen > len)
 114                         goto trunc;
 115
 116                 switch (bp[i]) {
 117                 case IP6MOPT_PAD1:
 118                         printf("(pad1)");
 119                         break;
 120                 case IP6MOPT_PADN:
 121                         if (len - i < IP6MOPT_MINLEN) {
 122                                 printf("(padn: trunc)");
 123                                 goto trunc;
 124                         }
 125                         printf("(padn)");
 126                         break;
 127                 case IP6MOPT_REFRESH:
 128                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 129                                 printf("(refresh: trunc)");
 130                                 goto trunc;
 131                         }
 132                         /* units of 4 secs */
 133                         printf("(refresh: %d)",
 134                                 EXTRACT_16BITS(&bp[i+2]) << 2);
 135                         break;
 136                 case IP6MOPT_ALTCOA:
 137                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 138                                 printf("(altcoa: trunc)");
 139                                 goto trunc;
 140                         }
 141                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 142                         break;
 143                 case IP6MOPT_NONCEID:
 144                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 145                                 printf("(ni: trunc)");
 146                                 goto trunc;
 147                         }
 148                         printf("(ni: ho=0x%04x co=0x%04x)",
 149                                 EXTRACT_16BITS(&bp[i+2]),
 150                                 EXTRACT_16BITS(&bp[i+4]));
 151                         break;
 152                 case IP6MOPT_AUTH:
 153                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 154                                 printf("(auth: trunc)");
 155                                 goto trunc;
 156                         }
 157                         printf("(auth)");
 158                         break;
 159                 default:
 160                         if (len - i < IP6MOPT_MINLEN) {
 161                                 printf("(sopt_type %d: trunc)", bp[i]);
 162                                 goto trunc;
 163                         }
 164                         printf("(type-0x%02x: len=%d)", bp[i], bp[i + 1]);
 165                         break;
 166                 }
 167         }
 168         return;
 169
 170 trunc:
 171         printf("[trunc] ");
 172 }
 173
 174 /*
 175  * Mobility Header
 176  */
 177 int
 178 mobility_print(const u_char *bp, const u_char *bp2 _U_)
 179 {
 180         const struct ip6_mobility *mh;
 181         const u_char *ep;
 182         int mhlen, hlen, type;
 183
 184         mh = (struct ip6_mobility *)bp;
 185
 186         /* 'ep' points to the end of available data. */
 187         ep = snapend;
 188
 189         if (!TTEST(mh->ip6m_len)) {
 190                 /*
 191                  * There's not enough captured data to include the
 192                  * mobility header length.
 193                  *
 194                  * Our caller expects us to return the length, however,
 195                  * so return a value that will run to the end of the
 196                  * captured data.
 197                  *
 198                  * XXX - "ip6_print()" doesn't do anything with the
 199                  * returned length, however, as it breaks out of the
 200                  * header-processing loop.
 201                  */
 202                 mhlen = ep - bp;
 203                 goto trunc;
 204         }
 205         mhlen = (int)((mh->ip6m_len + 1) << 3);
 206
 207         /* XXX ip6m_cksum */
 208
 209         TCHECK(mh->ip6m_type);
 210         type = mh->ip6m_type;
 211         switch (type) {
 212         case IP6M_BINDING_REQUEST:
 213                 printf("mobility: BRR");
 214                 hlen = IP6M_MINLEN;
 215                 break;
 216         case IP6M_HOME_TEST_INIT:
 217         case IP6M_CAREOF_TEST_INIT:
 218                 printf("mobility: %soTI",
 219                         type == IP6M_HOME_TEST_INIT ? "H" : "C");
 220                 hlen = IP6M_MINLEN;
 221                 if (vflag) {
 222                         TCHECK2(*mh, hlen + 8);
 223                         printf(" %s Init Cookie=%08x:%08x",
 224                                type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 225                                EXTRACT_32BITS(&bp[hlen]),
 226                                EXTRACT_32BITS(&bp[hlen + 4]));
 227                 }
 228                 hlen += 8;
 229                 break;
 230         case IP6M_HOME_TEST:
 231         case IP6M_CAREOF_TEST:
 232                 printf("mobility: %soT",
 233                         type == IP6M_HOME_TEST ? "H" : "C");
 234                 TCHECK(mh->ip6m_data16[0]);
 235                 printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 236                 hlen = IP6M_MINLEN;
 237                 if (vflag) {
 238                         TCHECK2(*mh, hlen + 8);
 239                         printf(" %s Init Cookie=%08x:%08x",
 240                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 241                                EXTRACT_32BITS(&bp[hlen]),
 242                                EXTRACT_32BITS(&bp[hlen + 4]));
 243                 }
 244                 hlen += 8;
 245                 if (vflag) {
 246                         TCHECK2(*mh, hlen + 8);
 247                         printf(" %s Keygen Token=%08x:%08x",
 248                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 249                                EXTRACT_32BITS(&bp[hlen]),
 250                                EXTRACT_32BITS(&bp[hlen + 4]));
 251                 }
 252                 hlen += 8;
 253                 break;
 254         case IP6M_BINDING_UPDATE:
 255                 printf("mobility: BU");
 256                 TCHECK(mh->ip6m_data16[0]);
 257                 printf(" seq#=%d", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 258                 hlen = IP6M_MINLEN;
 259                 TCHECK2(*mh, hlen + 1);
 260                 if (bp[hlen] & 0xf0)
 261                         printf(" ");
 262                 if (bp[hlen] & 0x80)
 263                         printf("A");
 264                 if (bp[hlen] & 0x40)
 265                         printf("H");
 266                 if (bp[hlen] & 0x20)
 267                         printf("L");
 268                 if (bp[hlen] & 0x10)
 269                         printf("K");
 270                 /* Reserved (4bits) */
 271                 hlen += 1;
 272                 /* Reserved (8bits) */
 273                 hlen += 1;
 274                 TCHECK2(*mh, hlen + 2);
 275                 /* units of 4 secs */
 276                 printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
 277                 hlen += 2;
 278                 break;
 279         case IP6M_BINDING_ACK:
 280                 printf("mobility: BA");
 281                 TCHECK(mh->ip6m_data8[0]);
 282                 printf(" status=%d", mh->ip6m_data8[0]);
 283                 if (mh->ip6m_data8[1] & 0x80)
 284                         printf(" K");
 285                 /* Reserved (7bits) */
 286                 hlen = IP6M_MINLEN;
 287                 TCHECK2(*mh, hlen + 2);
 288                 printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
 289                 hlen += 2;
 290                 TCHECK2(*mh, hlen + 2);
 291                 /* units of 4 secs */
 292                 printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
 293                 hlen += 2;
 294                 break;
 295         case IP6M_BINDING_ERROR:
 296                 printf("mobility: BE");
 297                 TCHECK(mh->ip6m_data8[0]);
 298                 printf(" status=%d", mh->ip6m_data8[0]);
 299                 /* Reserved */
 300                 hlen = IP6M_MINLEN;
 301                 TCHECK2(*mh, hlen + 16);
 302                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 303                 hlen += 16;
 304                 break;
 305         default:
 306                 printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
 307                 return(mhlen);
 308                 break;
 309         }
 310         if (vflag)
 311                 mobility_opt_print(&bp[hlen], mhlen - hlen);
 312
 313         return(mhlen);
 314
 315  trunc:
 316         fputs("[|MOBILITY]", stdout);
 317         return(mhlen);
 318 }
 319 #endif /* INET6 */