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

   1 /*
   2  * Copyright (C) 2002 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 /* \summary: IPv6 mobility printer */
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include <netdissect-stdinc.h>
  37
  38 #include "ip6.h"
  39 #include "netdissect.h"
  40 #include "addrtoname.h"
  41 #include "extract.h"
  42
  43 static const char tstr[] = "[|MOBILITY]";
  44
  45 /* Mobility header */
  46 struct ip6_mobility {
  47         uint8_t ip6m_pproto;    /* following payload protocol (for PG) */
  48         uint8_t ip6m_len;       /* length in units of 8 octets */
  49         uint8_t ip6m_type;      /* message type */
  50         uint8_t reserved;       /* reserved */
  51         uint16_t ip6m_cksum;    /* sum of IPv6 pseudo-header and MH */
  52         union {
  53                 uint16_t        ip6m_un_data16[1]; /* type-specific field */
  54                 uint8_t         ip6m_un_data8[2];  /* type-specific field */
  55         } ip6m_dataun;
  56 };
  57
  58 #define ip6m_data16     ip6m_dataun.ip6m_un_data16
  59 #define ip6m_data8      ip6m_dataun.ip6m_un_data8
  60
  61 #define IP6M_MINLEN     8
  62
  63 /* http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
  64
  65 /* message type */
  66 #define IP6M_BINDING_REQUEST    0       /* Binding Refresh Request */
  67 #define IP6M_HOME_TEST_INIT     1       /* Home Test Init */
  68 #define IP6M_CAREOF_TEST_INIT   2       /* Care-of Test Init */
  69 #define IP6M_HOME_TEST          3       /* Home Test */
  70 #define IP6M_CAREOF_TEST        4       /* Care-of Test */
  71 #define IP6M_BINDING_UPDATE     5       /* Binding Update */
  72 #define IP6M_BINDING_ACK        6       /* Binding Acknowledgement */
  73 #define IP6M_BINDING_ERROR      7       /* Binding Error */
  74 #define IP6M_MAX                7
  75
  76 static const struct tok ip6m_str[] = {
  77         { IP6M_BINDING_REQUEST,  "BRR"  },
  78         { IP6M_HOME_TEST_INIT,   "HoTI" },
  79         { IP6M_CAREOF_TEST_INIT, "CoTI" },
  80         { IP6M_HOME_TEST,        "HoT"  },
  81         { IP6M_CAREOF_TEST,      "CoT"  },
  82         { IP6M_BINDING_UPDATE,   "BU"   },
  83         { IP6M_BINDING_ACK,      "BA"   },
  84         { IP6M_BINDING_ERROR,    "BE"   },
  85         { 0, NULL }
  86 };
  87
  88 static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
  89         IP6M_MINLEN,      /* IP6M_BINDING_REQUEST  */
  90         IP6M_MINLEN + 8,  /* IP6M_HOME_TEST_INIT   */
  91         IP6M_MINLEN + 8,  /* IP6M_CAREOF_TEST_INIT */
  92         IP6M_MINLEN + 16, /* IP6M_HOME_TEST        */
  93         IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST      */
  94         IP6M_MINLEN + 4,  /* IP6M_BINDING_UPDATE   */
  95         IP6M_MINLEN + 4,  /* IP6M_BINDING_ACK      */
  96         IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR    */
  97 };
  98
  99 /* Mobility Header Options */
 100 #define IP6MOPT_MINLEN          2
 101 #define IP6MOPT_PAD1          0x0       /* Pad1 */
 102 #define IP6MOPT_PADN          0x1       /* PadN */
 103 #define IP6MOPT_REFRESH       0x2       /* Binding Refresh Advice */
 104 #define IP6MOPT_REFRESH_MINLEN  4
 105 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
 106 #define IP6MOPT_ALTCOA_MINLEN  18
 107 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
 108 #define IP6MOPT_NONCEID_MINLEN  6
 109 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
 110 #define IP6MOPT_AUTH_MINLEN    12
 111
 112 static int
 113 mobility_opt_print(netdissect_options *ndo,
 114                    const u_char *bp, const unsigned len)
 115 {
 116         unsigned i, optlen;
 117
 118         for (i = 0; i < len; i += optlen) {
 119                 ND_TCHECK(bp[i]);
 120                 if (bp[i] == IP6MOPT_PAD1)
 121                         optlen = 1;
 122                 else {
 123                         if (i + 1 < len) {
 124                                 ND_TCHECK(bp[i + 1]);
 125                                 optlen = bp[i + 1] + 2;
 126                         }
 127                         else
 128                                 goto trunc;
 129                 }
 130                 if (i + optlen > len)
 131                         goto trunc;
 132                 ND_TCHECK(bp[i + optlen]);
 133
 134                 switch (bp[i]) {
 135                 case IP6MOPT_PAD1:
 136                         ND_PRINT((ndo, "(pad1)"));
 137                         break;
 138                 case IP6MOPT_PADN:
 139                         if (len - i < IP6MOPT_MINLEN) {
 140                                 ND_PRINT((ndo, "(padn: trunc)"));
 141                                 goto trunc;
 142                         }
 143                         ND_PRINT((ndo, "(padn)"));
 144                         break;
 145                 case IP6MOPT_REFRESH:
 146                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 147                                 ND_PRINT((ndo, "(refresh: trunc)"));
 148                                 goto trunc;
 149                         }
 150                         /* units of 4 secs */
 151                         ND_PRINT((ndo, "(refresh: %u)",
 152                                 EXTRACT_16BITS(&bp[i+2]) << 2));
 153                         break;
 154                 case IP6MOPT_ALTCOA:
 155                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 156                                 ND_PRINT((ndo, "(altcoa: trunc)"));
 157                                 goto trunc;
 158                         }
 159                         ND_PRINT((ndo, "(alt-CoA: %s)", ip6addr_string(ndo, &bp[i+2])));
 160                         break;
 161                 case IP6MOPT_NONCEID:
 162                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 163                                 ND_PRINT((ndo, "(ni: trunc)"));
 164                                 goto trunc;
 165                         }
 166                         ND_PRINT((ndo, "(ni: ho=0x%04x co=0x%04x)",
 167                                 EXTRACT_16BITS(&bp[i+2]),
 168                                 EXTRACT_16BITS(&bp[i+4])));
 169                         break;
 170                 case IP6MOPT_AUTH:
 171                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 172                                 ND_PRINT((ndo, "(auth: trunc)"));
 173                                 goto trunc;
 174                         }
 175                         ND_PRINT((ndo, "(auth)"));
 176                         break;
 177                 default:
 178                         if (len - i < IP6MOPT_MINLEN) {
 179                                 ND_PRINT((ndo, "(sopt_type %u: trunc)", bp[i]));
 180                                 goto trunc;
 181                         }
 182                         ND_PRINT((ndo, "(type-0x%02x: len=%u)", bp[i], bp[i + 1]));
 183                         break;
 184                 }
 185         }
 186         return 0;
 187
 188 trunc:
 189         return 1;
 190 }
 191
 192 /*
 193  * Mobility Header
 194  */
 195 int
 196 mobility_print(netdissect_options *ndo,
 197                const u_char *bp, const u_char *bp2 _U_)
 198 {
 199         const struct ip6_mobility *mh;
 200         const u_char *ep;
 201         unsigned mhlen, hlen;
 202         uint8_t type;
 203
 204         mh = (const struct ip6_mobility *)bp;
 205
 206         /* 'ep' points to the end of available data. */
 207         ep = ndo->ndo_snapend;
 208
 209         if (!ND_TTEST(mh->ip6m_len)) {
 210                 /*
 211                  * There's not enough captured data to include the
 212                  * mobility header length.
 213                  *
 214                  * Our caller expects us to return the length, however,
 215                  * so return a value that will run to the end of the
 216                  * captured data.
 217                  *
 218                  * XXX - "ip6_print()" doesn't do anything with the
 219                  * returned length, however, as it breaks out of the
 220                  * header-processing loop.
 221                  */
 222                 mhlen = ep - bp;
 223                 goto trunc;
 224         }
 225         mhlen = (mh->ip6m_len + 1) << 3;
 226
 227         /* XXX ip6m_cksum */
 228
 229         ND_TCHECK(mh->ip6m_type);
 230         type = mh->ip6m_type;
 231         if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
 232                 ND_PRINT((ndo, "(header length %u is too small for type %u)", mhlen, type));
 233                 goto trunc;
 234         }
 235         ND_PRINT((ndo, "mobility: %s", tok2str(ip6m_str, "type-#%u", type)));
 236         switch (type) {
 237         case IP6M_BINDING_REQUEST:
 238                 hlen = IP6M_MINLEN;
 239                 break;
 240         case IP6M_HOME_TEST_INIT:
 241         case IP6M_CAREOF_TEST_INIT:
 242                 hlen = IP6M_MINLEN;
 243                 if (ndo->ndo_vflag) {
 244                         ND_TCHECK2(*mh, hlen + 8);
 245                         ND_PRINT((ndo, " %s Init Cookie=%08x:%08x",
 246                                type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 247                                EXTRACT_32BITS(&bp[hlen]),
 248                                EXTRACT_32BITS(&bp[hlen + 4])));
 249                 }
 250                 hlen += 8;
 251                 break;
 252         case IP6M_HOME_TEST:
 253         case IP6M_CAREOF_TEST:
 254                 ND_TCHECK(mh->ip6m_data16[0]);
 255                 ND_PRINT((ndo, " nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0])));
 256                 hlen = IP6M_MINLEN;
 257                 if (ndo->ndo_vflag) {
 258                         ND_TCHECK2(*mh, hlen + 8);
 259                         ND_PRINT((ndo, " %s Init Cookie=%08x:%08x",
 260                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 261                                EXTRACT_32BITS(&bp[hlen]),
 262                                EXTRACT_32BITS(&bp[hlen + 4])));
 263                 }
 264                 hlen += 8;
 265                 if (ndo->ndo_vflag) {
 266                         ND_TCHECK2(*mh, hlen + 8);
 267                         ND_PRINT((ndo, " %s Keygen Token=%08x:%08x",
 268                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 269                                EXTRACT_32BITS(&bp[hlen]),
 270                                EXTRACT_32BITS(&bp[hlen + 4])));
 271                 }
 272                 hlen += 8;
 273                 break;
 274         case IP6M_BINDING_UPDATE:
 275                 ND_TCHECK(mh->ip6m_data16[0]);
 276                 ND_PRINT((ndo, " seq#=%u", EXTRACT_16BITS(&mh->ip6m_data16[0])));
 277                 hlen = IP6M_MINLEN;
 278                 ND_TCHECK2(*mh, hlen + 1);
 279                 if (bp[hlen] & 0xf0)
 280                         ND_PRINT((ndo, " "));
 281                 if (bp[hlen] & 0x80)
 282                         ND_PRINT((ndo, "A"));
 283                 if (bp[hlen] & 0x40)
 284                         ND_PRINT((ndo, "H"));
 285                 if (bp[hlen] & 0x20)
 286                         ND_PRINT((ndo, "L"));
 287                 if (bp[hlen] & 0x10)
 288                         ND_PRINT((ndo, "K"));
 289                 /* Reserved (4bits) */
 290                 hlen += 1;
 291                 /* Reserved (8bits) */
 292                 hlen += 1;
 293                 ND_TCHECK2(*mh, hlen + 2);
 294                 /* units of 4 secs */
 295                 ND_PRINT((ndo, " lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2));
 296                 hlen += 2;
 297                 break;
 298         case IP6M_BINDING_ACK:
 299                 ND_TCHECK(mh->ip6m_data8[0]);
 300                 ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
 301                 if (mh->ip6m_data8[1] & 0x80)
 302                         ND_PRINT((ndo, " K"));
 303                 /* Reserved (7bits) */
 304                 hlen = IP6M_MINLEN;
 305                 ND_TCHECK2(*mh, hlen + 2);
 306                 ND_PRINT((ndo, " seq#=%u", EXTRACT_16BITS(&bp[hlen])));
 307                 hlen += 2;
 308                 ND_TCHECK2(*mh, hlen + 2);
 309                 /* units of 4 secs */
 310                 ND_PRINT((ndo, " lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2));
 311                 hlen += 2;
 312                 break;
 313         case IP6M_BINDING_ERROR:
 314                 ND_TCHECK(mh->ip6m_data8[0]);
 315                 ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
 316                 /* Reserved */
 317                 hlen = IP6M_MINLEN;
 318                 ND_TCHECK2(*mh, hlen + 16);
 319                 ND_PRINT((ndo, " homeaddr %s", ip6addr_string(ndo, &bp[hlen])));
 320                 hlen += 16;
 321                 break;
 322         default:
 323                 ND_PRINT((ndo, " len=%u", mh->ip6m_len));
 324                 return(mhlen);
 325                 break;
 326         }
 327         if (ndo->ndo_vflag)
 328                 if (mobility_opt_print(ndo, &bp[hlen], mhlen - hlen))
 329                         goto trunc;
 330
 331         return(mhlen);
 332
 333  trunc:
 334         ND_PRINT((ndo, "%s", tstr));
 335         return(mhlen);
 336 }