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 <stdio.h>
  38
  39 #include "ip6.h"
  40
  41 #include "interface.h"
  42 #include "addrtoname.h"
  43 #include "extract.h"            /* must come after interface.h */
  44
  45 /* Mobility header */
  46 struct ip6_mobility {
  47         u_int8_t ip6m_pproto;   /* following payload protocol (for PG) */
  48         u_int8_t ip6m_len;      /* length in units of 8 octets */
  49         u_int8_t ip6m_type;     /* message type */
  50         u_int8_t reserved;      /* reserved */
  51         u_int16_t ip6m_cksum;   /* sum of IPv6 pseudo-header and MH */
  52         union {
  53                 u_int16_t       ip6m_un_data16[1]; /* type-specific field */
  54                 u_int8_t        ip6m_un_data8[2];  /* type-specific fiedl */
  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
  75 /* XXX: unused */
  76 #define IP6MOPT_BU_MINLEN       10
  77 #define IP6MOPT_BA_MINLEN       13
  78 #define IP6MOPT_BR_MINLEN       2
  79
  80 /* Mobility Header Options */
  81 #define IP6MOPT_MINLEN          2
  82 #define IP6MOPT_PAD1          0x0       /* Pad1 */
  83 #define IP6MOPT_PADN          0x1       /* PadN */
  84 #define IP6MOPT_REFRESH       0x2       /* Binding Refresh Advice */
  85 #define IP6MOPT_REFRESH_MINLEN  4
  86 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
  87 #define IP6MOPT_ALTCOA_MINLEN  18
  88 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
  89 #define IP6MOPT_NONCEID_MINLEN  6
  90 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
  91 #define IP6MOPT_AUTH_MINLEN    12
  92
  93 static void
  94 mobility_opt_print(const u_char *bp, const unsigned len)
  95 {
  96         unsigned i, optlen;
  97
  98         for (i = 0; i < len; i += optlen) {
  99                 if (bp[i] == IP6MOPT_PAD1)
 100                         optlen = 1;
 101                 else {
 102                         if (i + 1 < len)
 103                                 optlen = bp[i + 1] + 2;
 104                         else
 105                                 goto trunc;
 106                 }
 107                 if (i + optlen > len)
 108                         goto trunc;
 109
 110                 switch (bp[i]) {
 111                 case IP6MOPT_PAD1:
 112                         printf("(pad1)");
 113                         break;
 114                 case IP6MOPT_PADN:
 115                         if (len - i < IP6MOPT_MINLEN) {
 116                                 printf("(padn: trunc)");
 117                                 goto trunc;
 118                         }
 119                         printf("(padn)");
 120                         break;
 121                 case IP6MOPT_REFRESH:
 122                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 123                                 printf("(refresh: trunc)");
 124                                 goto trunc;
 125                         }
 126                         /* units of 4 secs */
 127                         printf("(refresh: %u)",
 128                                 EXTRACT_16BITS(&bp[i+2]) << 2);
 129                         break;
 130                 case IP6MOPT_ALTCOA:
 131                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 132                                 printf("(altcoa: trunc)");
 133                                 goto trunc;
 134                         }
 135                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 136                         break;
 137                 case IP6MOPT_NONCEID:
 138                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 139                                 printf("(ni: trunc)");
 140                                 goto trunc;
 141                         }
 142                         printf("(ni: ho=0x%04x co=0x%04x)",
 143                                 EXTRACT_16BITS(&bp[i+2]),
 144                                 EXTRACT_16BITS(&bp[i+4]));
 145                         break;
 146                 case IP6MOPT_AUTH:
 147                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 148                                 printf("(auth: trunc)");
 149                                 goto trunc;
 150                         }
 151                         printf("(auth)");
 152                         break;
 153                 default:
 154                         if (len - i < IP6MOPT_MINLEN) {
 155                                 printf("(sopt_type %u: trunc)", bp[i]);
 156                                 goto trunc;
 157                         }
 158                         printf("(type-0x%02x: len=%u)", bp[i], bp[i + 1]);
 159                         break;
 160                 }
 161         }
 162         return;
 163
 164 trunc:
 165         printf("[trunc] ");
 166 }
 167
 168 /*
 169  * Mobility Header
 170  */
 171 int
 172 mobility_print(const u_char *bp, const u_char *bp2 _U_)
 173 {
 174         const struct ip6_mobility *mh;
 175         const u_char *ep;
 176         unsigned mhlen, hlen;
 177         u_int8_t type;
 178
 179         mh = (struct ip6_mobility *)bp;
 180
 181         /* 'ep' points to the end of available data. */
 182         ep = snapend;
 183
 184         if (!TTEST(mh->ip6m_len)) {
 185                 /*
 186                  * There's not enough captured data to include the
 187                  * mobility header length.
 188                  *
 189                  * Our caller expects us to return the length, however,
 190                  * so return a value that will run to the end of the
 191                  * captured data.
 192                  *
 193                  * XXX - "ip6_print()" doesn't do anything with the
 194                  * returned length, however, as it breaks out of the
 195                  * header-processing loop.
 196                  */
 197                 mhlen = ep - bp;
 198                 goto trunc;
 199         }
 200         mhlen = (mh->ip6m_len + 1) << 3;
 201
 202         /* XXX ip6m_cksum */
 203
 204         TCHECK(mh->ip6m_type);
 205         type = mh->ip6m_type;
 206         switch (type) {
 207         case IP6M_BINDING_REQUEST:
 208                 printf("mobility: BRR");
 209                 hlen = IP6M_MINLEN;
 210                 break;
 211         case IP6M_HOME_TEST_INIT:
 212         case IP6M_CAREOF_TEST_INIT:
 213                 printf("mobility: %soTI",
 214                         type == IP6M_HOME_TEST_INIT ? "H" : "C");
 215                 hlen = IP6M_MINLEN;
 216                 if (vflag) {
 217                         TCHECK2(*mh, hlen + 8);
 218                         printf(" %s Init Cookie=%08x:%08x",
 219                                type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 220                                EXTRACT_32BITS(&bp[hlen]),
 221                                EXTRACT_32BITS(&bp[hlen + 4]));
 222                 }
 223                 hlen += 8;
 224                 break;
 225         case IP6M_HOME_TEST:
 226         case IP6M_CAREOF_TEST:
 227                 printf("mobility: %soT",
 228                         type == IP6M_HOME_TEST ? "H" : "C");
 229                 TCHECK(mh->ip6m_data16[0]);
 230                 printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 231                 hlen = IP6M_MINLEN;
 232                 if (vflag) {
 233                         TCHECK2(*mh, hlen + 8);
 234                         printf(" %s Init Cookie=%08x:%08x",
 235                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 236                                EXTRACT_32BITS(&bp[hlen]),
 237                                EXTRACT_32BITS(&bp[hlen + 4]));
 238                 }
 239                 hlen += 8;
 240                 if (vflag) {
 241                         TCHECK2(*mh, hlen + 8);
 242                         printf(" %s Keygen Token=%08x:%08x",
 243                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 244                                EXTRACT_32BITS(&bp[hlen]),
 245                                EXTRACT_32BITS(&bp[hlen + 4]));
 246                 }
 247                 hlen += 8;
 248                 break;
 249         case IP6M_BINDING_UPDATE:
 250                 printf("mobility: BU");
 251                 TCHECK(mh->ip6m_data16[0]);
 252                 printf(" seq#=%u", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 253                 hlen = IP6M_MINLEN;
 254                 TCHECK2(*mh, hlen + 1);
 255                 if (bp[hlen] & 0xf0)
 256                         printf(" ");
 257                 if (bp[hlen] & 0x80)
 258                         printf("A");
 259                 if (bp[hlen] & 0x40)
 260                         printf("H");
 261                 if (bp[hlen] & 0x20)
 262                         printf("L");
 263                 if (bp[hlen] & 0x10)
 264                         printf("K");
 265                 /* Reserved (4bits) */
 266                 hlen += 1;
 267                 /* Reserved (8bits) */
 268                 hlen += 1;
 269                 TCHECK2(*mh, hlen + 2);
 270                 /* units of 4 secs */
 271                 printf(" lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2);
 272                 hlen += 2;
 273                 break;
 274         case IP6M_BINDING_ACK:
 275                 printf("mobility: BA");
 276                 TCHECK(mh->ip6m_data8[0]);
 277                 printf(" status=%u", mh->ip6m_data8[0]);
 278                 if (mh->ip6m_data8[1] & 0x80)
 279                         printf(" K");
 280                 /* Reserved (7bits) */
 281                 hlen = IP6M_MINLEN;
 282                 TCHECK2(*mh, hlen + 2);
 283                 printf(" seq#=%u", EXTRACT_16BITS(&bp[hlen]));
 284                 hlen += 2;
 285                 TCHECK2(*mh, hlen + 2);
 286                 /* units of 4 secs */
 287                 printf(" lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2);
 288                 hlen += 2;
 289                 break;
 290         case IP6M_BINDING_ERROR:
 291                 printf("mobility: BE");
 292                 TCHECK(mh->ip6m_data8[0]);
 293                 printf(" status=%u", mh->ip6m_data8[0]);
 294                 /* Reserved */
 295                 hlen = IP6M_MINLEN;
 296                 TCHECK2(*mh, hlen + 16);
 297                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 298                 hlen += 16;
 299                 break;
 300         default:
 301                 printf("mobility: type-#%u len=%u", type, mh->ip6m_len);
 302                 return(mhlen);
 303                 break;
 304         }
 305         if (vflag)
 306                 mobility_opt_print(&bp[hlen], mhlen - hlen);
 307
 308         return(mhlen);
 309
 310  trunc:
 311         fputs("[|MOBILITY]", stdout);
 312         return(mhlen);
 313 }
 314 #endif /* INET6 */