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 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #ifdef INET6
  35 #include <tcpdump-stdinc.h>
  36
  37 #include "ip6.h"
  38 #include "interface.h"
  39 #include "addrtoname.h"
  40 #include "extract.h"            /* must come after interface.h */
  41
  42 /* Mobility header */
  43 struct ip6_mobility {
  44         uint8_t ip6m_pproto;    /* following payload protocol (for PG) */
  45         uint8_t ip6m_len;       /* length in units of 8 octets */
  46         uint8_t ip6m_type;      /* message type */
  47         uint8_t reserved;       /* reserved */
  48         uint16_t ip6m_cksum;    /* sum of IPv6 pseudo-header and MH */
  49         union {
  50                 uint16_t        ip6m_un_data16[1]; /* type-specific field */
  51                 uint8_t         ip6m_un_data8[2];  /* type-specific field */
  52         } ip6m_dataun;
  53 };
  54
  55 #define ip6m_data16     ip6m_dataun.ip6m_un_data16
  56 #define ip6m_data8      ip6m_dataun.ip6m_un_data8
  57
  58 #define IP6M_MINLEN     8
  59
  60 /* http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
  61
  62 /* message type */
  63 #define IP6M_BINDING_REQUEST    0       /* Binding Refresh Request */
  64 #define IP6M_HOME_TEST_INIT     1       /* Home Test Init */
  65 #define IP6M_CAREOF_TEST_INIT   2       /* Care-of Test Init */
  66 #define IP6M_HOME_TEST          3       /* Home Test */
  67 #define IP6M_CAREOF_TEST        4       /* Care-of Test */
  68 #define IP6M_BINDING_UPDATE     5       /* Binding Update */
  69 #define IP6M_BINDING_ACK        6       /* Binding Acknowledgement */
  70 #define IP6M_BINDING_ERROR      7       /* Binding Error */
  71 #define IP6M_MAX                7
  72
  73 static const struct tok ip6m_str[] = {
  74         { IP6M_BINDING_REQUEST,  "BRR"  },
  75         { IP6M_HOME_TEST_INIT,   "HoTI" },
  76         { IP6M_CAREOF_TEST_INIT, "CoTI" },
  77         { IP6M_HOME_TEST,        "HoT"  },
  78         { IP6M_CAREOF_TEST,      "CoT"  },
  79         { IP6M_BINDING_UPDATE,   "BU"   },
  80         { IP6M_BINDING_ACK,      "BA"   },
  81         { IP6M_BINDING_ERROR,    "BE"   },
  82         { 0, NULL }
  83 };
  84
  85 static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
  86         IP6M_MINLEN,      /* IP6M_BINDING_REQUEST  */
  87         IP6M_MINLEN + 8,  /* IP6M_HOME_TEST_INIT   */
  88         IP6M_MINLEN + 8,  /* IP6M_CAREOF_TEST_INIT */
  89         IP6M_MINLEN + 16, /* IP6M_HOME_TEST        */
  90         IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST      */
  91         IP6M_MINLEN + 4,  /* IP6M_BINDING_UPDATE   */
  92         IP6M_MINLEN + 4,  /* IP6M_BINDING_ACK      */
  93         IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR    */
  94 };
  95
  96 /* Mobility Header Options */
  97 #define IP6MOPT_MINLEN          2
  98 #define IP6MOPT_PAD1          0x0       /* Pad1 */
  99 #define IP6MOPT_PADN          0x1       /* PadN */
 100 #define IP6MOPT_REFRESH       0x2       /* Binding Refresh Advice */
 101 #define IP6MOPT_REFRESH_MINLEN  4
 102 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
 103 #define IP6MOPT_ALTCOA_MINLEN  18
 104 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
 105 #define IP6MOPT_NONCEID_MINLEN  6
 106 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
 107 #define IP6MOPT_AUTH_MINLEN    12
 108
 109 static void
 110 mobility_opt_print(netdissect_options *ndo,
 111                    const u_char *bp, const unsigned len)
 112 {
 113         unsigned i, optlen;
 114
 115         for (i = 0; i < len; i += optlen) {
 116                 ND_TCHECK(bp[i]);
 117                 if (bp[i] == IP6MOPT_PAD1)
 118                         optlen = 1;
 119                 else {
 120                         if (i + 1 < len) {
 121                                 ND_TCHECK(bp[i + 1]);
 122                                 optlen = bp[i + 1] + 2;
 123                         }
 124                         else
 125                                 goto trunc;
 126                 }
 127                 if (i + optlen > len)
 128                         goto trunc;
 129                 ND_TCHECK(bp[i + optlen]);
 130
 131                 switch (bp[i]) {
 132                 case IP6MOPT_PAD1:
 133                         ND_PRINT((ndo, "(pad1)"));
 134                         break;
 135                 case IP6MOPT_PADN:
 136                         if (len - i < IP6MOPT_MINLEN) {
 137                                 ND_PRINT((ndo, "(padn: trunc)"));
 138                                 goto trunc;
 139                         }
 140                         ND_PRINT((ndo, "(padn)"));
 141                         break;
 142                 case IP6MOPT_REFRESH:
 143                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 144                                 ND_PRINT((ndo, "(refresh: trunc)"));
 145                                 goto trunc;
 146                         }
 147                         /* units of 4 secs */
 148                         ND_PRINT((ndo, "(refresh: %u)",
 149                                 EXTRACT_16BITS(&bp[i+2]) << 2));
 150                         break;
 151                 case IP6MOPT_ALTCOA:
 152                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 153                                 ND_PRINT((ndo, "(altcoa: trunc)"));
 154                                 goto trunc;
 155                         }
 156                         ND_PRINT((ndo, "(alt-CoA: %s)", ip6addr_string(ndo, &bp[i+2])));
 157                         break;
 158                 case IP6MOPT_NONCEID:
 159                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 160                                 ND_PRINT((ndo, "(ni: trunc)"));
 161                                 goto trunc;
 162                         }
 163                         ND_PRINT((ndo, "(ni: ho=0x%04x co=0x%04x)",
 164                                 EXTRACT_16BITS(&bp[i+2]),
 165                                 EXTRACT_16BITS(&bp[i+4])));
 166                         break;
 167                 case IP6MOPT_AUTH:
 168                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 169                                 ND_PRINT((ndo, "(auth: trunc)"));
 170                                 goto trunc;
 171                         }
 172                         ND_PRINT((ndo, "(auth)"));
 173                         break;
 174                 default:
 175                         if (len - i < IP6MOPT_MINLEN) {
 176                                 ND_PRINT((ndo, "(sopt_type %u: trunc)", bp[i]));
 177                                 goto trunc;
 178                         }
 179                         ND_PRINT((ndo, "(type-0x%02x: len=%u)", bp[i], bp[i + 1]));
 180                         break;
 181                 }
 182         }
 183         return;
 184
 185 trunc:
 186         ND_PRINT((ndo, "[trunc] "));
 187 }
 188
 189 /*
 190  * Mobility Header
 191  */
 192 int
 193 mobility_print(netdissect_options *ndo,
 194                const u_char *bp, const u_char *bp2 _U_)
 195 {
 196         const struct ip6_mobility *mh;
 197         const u_char *ep;
 198         unsigned mhlen, hlen;
 199         uint8_t type;
 200
 201         mh = (const struct ip6_mobility *)bp;
 202
 203         /* 'ep' points to the end of available data. */
 204         ep = ndo->ndo_snapend;
 205
 206         if (!ND_TTEST(mh->ip6m_len)) {
 207                 /*
 208                  * There's not enough captured data to include the
 209                  * mobility header length.
 210                  *
 211                  * Our caller expects us to return the length, however,
 212                  * so return a value that will run to the end of the
 213                  * captured data.
 214                  *
 215                  * XXX - "ip6_print()" doesn't do anything with the
 216                  * returned length, however, as it breaks out of the
 217                  * header-processing loop.
 218                  */
 219                 mhlen = ep - bp;
 220                 goto trunc;
 221         }
 222         mhlen = (mh->ip6m_len + 1) << 3;
 223
 224         /* XXX ip6m_cksum */
 225
 226         ND_TCHECK(mh->ip6m_type);
 227         type = mh->ip6m_type;
 228         if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
 229                 ND_PRINT((ndo, "(header length %u is too small for type %u)", mhlen, type));
 230                 goto trunc;
 231         }
 232         ND_PRINT((ndo, "mobility: %s", tok2str(ip6m_str, "type-#%u", type)));
 233         switch (type) {
 234         case IP6M_BINDING_REQUEST:
 235                 hlen = IP6M_MINLEN;
 236                 break;
 237         case IP6M_HOME_TEST_INIT:
 238         case IP6M_CAREOF_TEST_INIT:
 239                 hlen = IP6M_MINLEN;
 240                 if (ndo->ndo_vflag) {
 241                         ND_TCHECK2(*mh, hlen + 8);
 242                         ND_PRINT((ndo, " %s Init Cookie=%08x:%08x",
 243                                type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 244                                EXTRACT_32BITS(&bp[hlen]),
 245                                EXTRACT_32BITS(&bp[hlen + 4])));
 246                 }
 247                 hlen += 8;
 248                 break;
 249         case IP6M_HOME_TEST:
 250         case IP6M_CAREOF_TEST:
 251                 ND_TCHECK(mh->ip6m_data16[0]);
 252                 ND_PRINT((ndo, " nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0])));
 253                 hlen = IP6M_MINLEN;
 254                 if (ndo->ndo_vflag) {
 255                         ND_TCHECK2(*mh, hlen + 8);
 256                         ND_PRINT((ndo, " %s Init Cookie=%08x:%08x",
 257                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 258                                EXTRACT_32BITS(&bp[hlen]),
 259                                EXTRACT_32BITS(&bp[hlen + 4])));
 260                 }
 261                 hlen += 8;
 262                 if (ndo->ndo_vflag) {
 263                         ND_TCHECK2(*mh, hlen + 8);
 264                         ND_PRINT((ndo, " %s Keygen Token=%08x:%08x",
 265                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 266                                EXTRACT_32BITS(&bp[hlen]),
 267                                EXTRACT_32BITS(&bp[hlen + 4])));
 268                 }
 269                 hlen += 8;
 270                 break;
 271         case IP6M_BINDING_UPDATE:
 272                 ND_TCHECK(mh->ip6m_data16[0]);
 273                 ND_PRINT((ndo, " seq#=%u", EXTRACT_16BITS(&mh->ip6m_data16[0])));
 274                 hlen = IP6M_MINLEN;
 275                 ND_TCHECK2(*mh, hlen + 1);
 276                 if (bp[hlen] & 0xf0)
 277                         ND_PRINT((ndo, " "));
 278                 if (bp[hlen] & 0x80)
 279                         ND_PRINT((ndo, "A"));
 280                 if (bp[hlen] & 0x40)
 281                         ND_PRINT((ndo, "H"));
 282                 if (bp[hlen] & 0x20)
 283                         ND_PRINT((ndo, "L"));
 284                 if (bp[hlen] & 0x10)
 285                         ND_PRINT((ndo, "K"));
 286                 /* Reserved (4bits) */
 287                 hlen += 1;
 288                 /* Reserved (8bits) */
 289                 hlen += 1;
 290                 ND_TCHECK2(*mh, hlen + 2);
 291                 /* units of 4 secs */
 292                 ND_PRINT((ndo, " lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2));
 293                 hlen += 2;
 294                 break;
 295         case IP6M_BINDING_ACK:
 296                 ND_TCHECK(mh->ip6m_data8[0]);
 297                 ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
 298                 if (mh->ip6m_data8[1] & 0x80)
 299                         ND_PRINT((ndo, " K"));
 300                 /* Reserved (7bits) */
 301                 hlen = IP6M_MINLEN;
 302                 ND_TCHECK2(*mh, hlen + 2);
 303                 ND_PRINT((ndo, " seq#=%u", EXTRACT_16BITS(&bp[hlen])));
 304                 hlen += 2;
 305                 ND_TCHECK2(*mh, hlen + 2);
 306                 /* units of 4 secs */
 307                 ND_PRINT((ndo, " lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2));
 308                 hlen += 2;
 309                 break;
 310         case IP6M_BINDING_ERROR:
 311                 ND_TCHECK(mh->ip6m_data8[0]);
 312                 ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
 313                 /* Reserved */
 314                 hlen = IP6M_MINLEN;
 315                 ND_TCHECK2(*mh, hlen + 16);
 316                 ND_PRINT((ndo, " homeaddr %s", ip6addr_string(ndo, &bp[hlen])));
 317                 hlen += 16;
 318                 break;
 319         default:
 320                 ND_PRINT((ndo, " len=%u", mh->ip6m_len));
 321                 return(mhlen);
 322                 break;
 323         }
 324         if (ndo->ndo_vflag)
 325                 mobility_opt_print(ndo, &bp[hlen], mhlen - hlen);
 326
 327         return(mhlen);
 328
 329  trunc:
 330         ND_PRINT((ndo, "[|MOBILITY]"));
 331         return(mhlen);
 332 }
 333 #endif /* INET6 */