external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  31 #ifndef lint
  32 __RCSID("$NetBSD: print-mobility.c,v 1.5 2015/03/31 21:59:35 christos Exp $");
  33 #endif
  34
  35 #define NETDISSECT_REWORKED
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #ifdef INET6
  41 #include <tcpdump-stdinc.h>
  42
  43 #include "ip6.h"
  44 #include "interface.h"
  45 #include "addrtoname.h"
  46 #include "extract.h"            /* must come after interface.h */
  47
  48 /* Mobility header */
  49 struct ip6_mobility {
  50         uint8_t ip6m_pproto;    /* following payload protocol (for PG) */
  51         uint8_t ip6m_len;       /* length in units of 8 octets */
  52         uint8_t ip6m_type;      /* message type */
  53         uint8_t reserved;       /* reserved */
  54         uint16_t ip6m_cksum;    /* sum of IPv6 pseudo-header and MH */
  55         union {
  56                 uint16_t        ip6m_un_data16[1]; /* type-specific field */
  57                 uint8_t         ip6m_un_data8[2];  /* type-specific field */
  58         } ip6m_dataun;
  59 };
  60
  61 #define ip6m_data16     ip6m_dataun.ip6m_un_data16
  62 #define ip6m_data8      ip6m_dataun.ip6m_un_data8
  63
  64 #define IP6M_MINLEN     8
  65
  66 /* http://www.iana.org/assignments/mobility-parameters/mobility-parameters.xhtml */
  67
  68 /* message type */
  69 #define IP6M_BINDING_REQUEST    0       /* Binding Refresh Request */
  70 #define IP6M_HOME_TEST_INIT     1       /* Home Test Init */
  71 #define IP6M_CAREOF_TEST_INIT   2       /* Care-of Test Init */
  72 #define IP6M_HOME_TEST          3       /* Home Test */
  73 #define IP6M_CAREOF_TEST        4       /* Care-of Test */
  74 #define IP6M_BINDING_UPDATE     5       /* Binding Update */
  75 #define IP6M_BINDING_ACK        6       /* Binding Acknowledgement */
  76 #define IP6M_BINDING_ERROR      7       /* Binding Error */
  77 #define IP6M_MAX                7
  78
  79 static const unsigned ip6m_hdrlen[IP6M_MAX + 1] = {
  80         IP6M_MINLEN,      /* IP6M_BINDING_REQUEST  */
  81         IP6M_MINLEN + 8,  /* IP6M_HOME_TEST_INIT   */
  82         IP6M_MINLEN + 8,  /* IP6M_CAREOF_TEST_INIT */
  83         IP6M_MINLEN + 16, /* IP6M_HOME_TEST        */
  84         IP6M_MINLEN + 16, /* IP6M_CAREOF_TEST      */
  85         IP6M_MINLEN + 4,  /* IP6M_BINDING_UPDATE   */
  86         IP6M_MINLEN + 4,  /* IP6M_BINDING_ACK      */
  87         IP6M_MINLEN + 16, /* IP6M_BINDING_ERROR    */
  88 };
  89
  90 /* XXX: unused */
  91 #define IP6MOPT_BU_MINLEN       10
  92 #define IP6MOPT_BA_MINLEN       13
  93 #define IP6MOPT_BR_MINLEN       2
  94
  95 /* Mobility Header Options */
  96 #define IP6MOPT_MINLEN          2
  97 #define IP6MOPT_PAD1          0x0       /* Pad1 */
  98 #define IP6MOPT_PADN          0x1       /* PadN */
  99 #define IP6MOPT_REFRESH       0x2       /* Binding Refresh Advice */
 100 #define IP6MOPT_REFRESH_MINLEN  4
 101 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
 102 #define IP6MOPT_ALTCOA_MINLEN  18
 103 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
 104 #define IP6MOPT_NONCEID_MINLEN  6
 105 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
 106 #define IP6MOPT_AUTH_MINLEN    12
 107
 108 static void
 109 mobility_opt_print(netdissect_options *ndo,
 110                    const u_char *bp, const unsigned len)
 111 {
 112         unsigned i, optlen;
 113
 114         for (i = 0; i < len; i += optlen) {
 115                 ND_TCHECK(bp[i]);
 116                 if (bp[i] == IP6MOPT_PAD1)
 117                         optlen = 1;
 118                 else {
 119                         if (i + 1 < len) {
 120                                 ND_TCHECK(bp[i + 1]);
 121                                 optlen = bp[i + 1] + 2;
 122                         }
 123                         else
 124                                 goto trunc;
 125                 }
 126                 if (i + optlen > len)
 127                         goto trunc;
 128                 ND_TCHECK(bp[i + optlen]);
 129
 130                 switch (bp[i]) {
 131                 case IP6MOPT_PAD1:
 132                         ND_PRINT((ndo, "(pad1)"));
 133                         break;
 134                 case IP6MOPT_PADN:
 135                         if (len - i < IP6MOPT_MINLEN) {
 136                                 ND_PRINT((ndo, "(padn: trunc)"));
 137                                 goto trunc;
 138                         }
 139                         ND_PRINT((ndo, "(padn)"));
 140                         break;
 141                 case IP6MOPT_REFRESH:
 142                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 143                                 ND_PRINT((ndo, "(refresh: trunc)"));
 144                                 goto trunc;
 145                         }
 146                         /* units of 4 secs */
 147                         ND_PRINT((ndo, "(refresh: %u)",
 148                                 EXTRACT_16BITS(&bp[i+2]) << 2));
 149                         break;
 150                 case IP6MOPT_ALTCOA:
 151                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 152                                 ND_PRINT((ndo, "(altcoa: trunc)"));
 153                                 goto trunc;
 154                         }
 155                         ND_PRINT((ndo, "(alt-CoA: %s)", ip6addr_string(ndo, &bp[i+2])));
 156                         break;
 157                 case IP6MOPT_NONCEID:
 158                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 159                                 ND_PRINT((ndo, "(ni: trunc)"));
 160                                 goto trunc;
 161                         }
 162                         ND_PRINT((ndo, "(ni: ho=0x%04x co=0x%04x)",
 163                                 EXTRACT_16BITS(&bp[i+2]),
 164                                 EXTRACT_16BITS(&bp[i+4])));
 165                         break;
 166                 case IP6MOPT_AUTH:
 167                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 168                                 ND_PRINT((ndo, "(auth: trunc)"));
 169                                 goto trunc;
 170                         }
 171                         ND_PRINT((ndo, "(auth)"));
 172                         break;
 173                 default:
 174                         if (len - i < IP6MOPT_MINLEN) {
 175                                 ND_PRINT((ndo, "(sopt_type %u: trunc)", bp[i]));
 176                                 goto trunc;
 177                         }
 178                         ND_PRINT((ndo, "(type-0x%02x: len=%u)", bp[i], bp[i + 1]));
 179                         break;
 180                 }
 181         }
 182         return;
 183
 184 trunc:
 185         ND_PRINT((ndo, "[trunc] "));
 186 }
 187
 188 /*
 189  * Mobility Header
 190  */
 191 int
 192 mobility_print(netdissect_options *ndo,
 193                const u_char *bp, const u_char *bp2 _U_)
 194 {
 195         const struct ip6_mobility *mh;
 196         const u_char *ep;
 197         unsigned mhlen, hlen;
 198         uint8_t type;
 199
 200         mh = (struct ip6_mobility *)bp;
 201
 202         /* 'ep' points to the end of available data. */
 203         ep = ndo->ndo_snapend;
 204
 205         if (!ND_TTEST(mh->ip6m_len)) {
 206                 /*
 207                  * There's not enough captured data to include the
 208                  * mobility header length.
 209                  *
 210                  * Our caller expects us to return the length, however,
 211                  * so return a value that will run to the end of the
 212                  * captured data.
 213                  *
 214                  * XXX - "ip6_print()" doesn't do anything with the
 215                  * returned length, however, as it breaks out of the
 216                  * header-processing loop.
 217                  */
 218                 mhlen = ep - bp;
 219                 goto trunc;
 220         }
 221         mhlen = (mh->ip6m_len + 1) << 3;
 222
 223         /* XXX ip6m_cksum */
 224
 225         ND_TCHECK(mh->ip6m_type);
 226         type = mh->ip6m_type;
 227         if (type <= IP6M_MAX && mhlen < ip6m_hdrlen[type]) {
 228                 ND_PRINT((ndo, "(header length %u is too small for type %u)", mhlen, type));
 229                 goto trunc;
 230         }
 231         switch (type) {
 232         case IP6M_BINDING_REQUEST:
 233                 ND_PRINT((ndo, "mobility: BRR"));
 234                 hlen = IP6M_MINLEN;
 235                 break;
 236         case IP6M_HOME_TEST_INIT:
 237         case IP6M_CAREOF_TEST_INIT:
 238                 ND_PRINT((ndo, "mobility: %soTI",
 239                         type == IP6M_HOME_TEST_INIT ? "H" : "C"));
 240                 hlen = IP6M_MINLEN;
 241                 if (ndo->ndo_vflag) {
 242                         ND_TCHECK2(*mh, hlen + 8);
 243                         ND_PRINT((ndo, " %s Init Cookie=%08x:%08x",
 244                                type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 245                                EXTRACT_32BITS(&bp[hlen]),
 246                                EXTRACT_32BITS(&bp[hlen + 4])));
 247                 }
 248                 hlen += 8;
 249                 break;
 250         case IP6M_HOME_TEST:
 251         case IP6M_CAREOF_TEST:
 252                 ND_PRINT((ndo, "mobility: %soT",
 253                         type == IP6M_HOME_TEST ? "H" : "C"));
 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_PRINT((ndo, "mobility: BU"));
 276                 ND_TCHECK(mh->ip6m_data16[0]);
 277                 ND_PRINT((ndo, " seq#=%u", EXTRACT_16BITS(&mh->ip6m_data16[0])));
 278                 hlen = IP6M_MINLEN;
 279                 ND_TCHECK2(*mh, hlen + 1);
 280                 if (bp[hlen] & 0xf0)
 281                         ND_PRINT((ndo, " "));
 282                 if (bp[hlen] & 0x80)
 283                         ND_PRINT((ndo, "A"));
 284                 if (bp[hlen] & 0x40)
 285                         ND_PRINT((ndo, "H"));
 286                 if (bp[hlen] & 0x20)
 287                         ND_PRINT((ndo, "L"));
 288                 if (bp[hlen] & 0x10)
 289                         ND_PRINT((ndo, "K"));
 290                 /* Reserved (4bits) */
 291                 hlen += 1;
 292                 /* Reserved (8bits) */
 293                 hlen += 1;
 294                 ND_TCHECK2(*mh, hlen + 2);
 295                 /* units of 4 secs */
 296                 ND_PRINT((ndo, " lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2));
 297                 hlen += 2;
 298                 break;
 299         case IP6M_BINDING_ACK:
 300                 ND_PRINT((ndo, "mobility: BA"));
 301                 ND_TCHECK(mh->ip6m_data8[0]);
 302                 ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
 303                 if (mh->ip6m_data8[1] & 0x80)
 304                         ND_PRINT((ndo, " K"));
 305                 /* Reserved (7bits) */
 306                 hlen = IP6M_MINLEN;
 307                 ND_TCHECK2(*mh, hlen + 2);
 308                 ND_PRINT((ndo, " seq#=%u", EXTRACT_16BITS(&bp[hlen])));
 309                 hlen += 2;
 310                 ND_TCHECK2(*mh, hlen + 2);
 311                 /* units of 4 secs */
 312                 ND_PRINT((ndo, " lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2));
 313                 hlen += 2;
 314                 break;
 315         case IP6M_BINDING_ERROR:
 316                 ND_PRINT((ndo, "mobility: BE"));
 317                 ND_TCHECK(mh->ip6m_data8[0]);
 318                 ND_PRINT((ndo, " status=%u", mh->ip6m_data8[0]));
 319                 /* Reserved */
 320                 hlen = IP6M_MINLEN;
 321                 ND_TCHECK2(*mh, hlen + 16);
 322                 ND_PRINT((ndo, " homeaddr %s", ip6addr_string(ndo, &bp[hlen])));
 323                 hlen += 16;
 324                 break;
 325         default:
 326                 ND_PRINT((ndo, "mobility: type-#%u len=%u", type, mh->ip6m_len));
 327                 return(mhlen);
 328                 break;
 329         }
 330         if (ndo->ndo_vflag)
 331                 mobility_opt_print(ndo, &bp[hlen], mhlen - hlen);
 332
 333         return(mhlen);
 334
 335  trunc:
 336         ND_PRINT((ndo, "[|MOBILITY]"));
 337         return(mhlen);
 338 }
 339 #endif /* INET6 */