contrib/tcpdump/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 #ifndef lint
  35 static const char rcsid[] _U_ =
  36      "@(#) $Header: /tcpdump/master/tcpdump/print-mobility.c,v 1.12 2005-04-20 22:21:00 guy Exp $";
  37 #endif
  38
  39 #ifdef INET6
  40 #include <tcpdump-stdinc.h>
  41
  42 #include <stdio.h>
  43
  44 #include "ip6.h"
  45
  46 #include "interface.h"
  47 #include "addrtoname.h"
  48 #include "extract.h"            /* must come after interface.h */
  49
  50 /* Mobility header */
  51 struct ip6_mobility {
  52         u_int8_t ip6m_pproto;   /* following payload protocol (for PG) */
  53         u_int8_t ip6m_len;      /* length in units of 8 octets */
  54         u_int8_t ip6m_type;     /* message type */
  55         u_int8_t reserved;      /* reserved */
  56         u_int16_t ip6m_cksum;   /* sum of IPv6 pseudo-header and MH */
  57         union {
  58                 u_int16_t       ip6m_un_data16[1]; /* type-specific field */
  59                 u_int8_t        ip6m_un_data8[2];  /* type-specific fiedl */
  60         } ip6m_dataun;
  61 };
  62
  63 #define ip6m_data16     ip6m_dataun.ip6m_un_data16
  64 #define ip6m_data8      ip6m_dataun.ip6m_un_data8
  65
  66 #define IP6M_MINLEN     8
  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
  78 /* Mobility Header Options */
  79 #define IP6MOPT_MINLEN          2
  80 #define IP6MOPT_PAD1          0x0       /* Pad1 */
  81 #define IP6MOPT_PADN          0x1       /* PadN */
  82 #define IP6MOPT_REFRESH       0x2       /* Binding Refresh Advice */
  83 #define IP6MOPT_REFRESH_MINLEN  4
  84 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
  85 #define IP6MOPT_ALTCOA_MINLEN  18
  86 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
  87 #define IP6MOPT_NONCEID_MINLEN  6
  88 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
  89 #define IP6MOPT_AUTH_MINLEN    12
  90
  91 static void
  92 mobility_opt_print(const u_char *bp, int len)
  93 {
  94         int i;
  95         int optlen;
  96
  97         for (i = 0; i < len; i += optlen) {
  98                 if (bp[i] == IP6MOPT_PAD1)
  99                         optlen = 1;
 100                 else {
 101                         if (i + 1 < len)
 102                                 optlen = bp[i + 1] + 2;
 103                         else
 104                                 goto trunc;
 105                 }
 106                 if (i + optlen > len)
 107                         goto trunc;
 108
 109                 switch (bp[i]) {
 110                 case IP6MOPT_PAD1:
 111                         printf("(pad1)");
 112                         break;
 113                 case IP6MOPT_PADN:
 114                         if (len - i < IP6MOPT_MINLEN) {
 115                                 printf("(padn: trunc)");
 116                                 goto trunc;
 117                         }
 118                         printf("(padn)");
 119                         break;
 120                 case IP6MOPT_REFRESH:
 121                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 122                                 printf("(refresh: trunc)");
 123                                 goto trunc;
 124                         }
 125                         /* units of 4 secs */
 126                         printf("(refresh: %d)",
 127                                 EXTRACT_16BITS(&bp[i+2]) << 2);
 128                         break;
 129                 case IP6MOPT_ALTCOA:
 130                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 131                                 printf("(altcoa: trunc)");
 132                                 goto trunc;
 133                         }
 134                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 135                         break;
 136                 case IP6MOPT_NONCEID:
 137                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 138                                 printf("(ni: trunc)");
 139                                 goto trunc;
 140                         }
 141                         printf("(ni: ho=0x%04x co=0x%04x)",
 142                                 EXTRACT_16BITS(&bp[i+2]),
 143                                 EXTRACT_16BITS(&bp[i+4]));
 144                         break;
 145                 case IP6MOPT_AUTH:
 146                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 147                                 printf("(auth: trunc)");
 148                                 goto trunc;
 149                         }
 150                         printf("(auth)");
 151                         break;
 152                 default:
 153                         if (len - i < IP6MOPT_MINLEN) {
 154                                 printf("(sopt_type %d: trunc)", bp[i]);
 155                                 goto trunc;
 156                         }
 157                         printf("(type-0x%02x: len=%d)", bp[i], bp[i + 1]);
 158                         break;
 159                 }
 160         }
 161         return;
 162
 163 trunc:
 164         printf("[trunc] ");
 165 }
 166
 167 /*
 168  * Mobility Header
 169  */
 170 int
 171 mobility_print(const u_char *bp, const u_char *bp2 _U_)
 172 {
 173         const struct ip6_mobility *mh;
 174         const u_char *ep;
 175         int mhlen, hlen, type;
 176
 177         mh = (struct ip6_mobility *)bp;
 178
 179         /* 'ep' points to the end of available data. */
 180         ep = snapend;
 181
 182         if (!TTEST(mh->ip6m_len)) {
 183                 /*
 184                  * There's not enough captured data to include the
 185                  * mobility header length.
 186                  *
 187                  * Our caller expects us to return the length, however,
 188                  * so return a value that will run to the end of the
 189                  * captured data.
 190                  *
 191                  * XXX - "ip6_print()" doesn't do anything with the
 192                  * returned length, however, as it breaks out of the
 193                  * header-processing loop.
 194                  */
 195                 mhlen = ep - bp;
 196                 goto trunc;
 197         }
 198         mhlen = (int)((mh->ip6m_len + 1) << 3);
 199
 200         /* XXX ip6m_cksum */
 201
 202         TCHECK(mh->ip6m_type);
 203         type = mh->ip6m_type;
 204         switch (type) {
 205         case IP6M_BINDING_REQUEST:
 206                 printf("mobility: BRR");
 207                 hlen = IP6M_MINLEN;
 208                 break;
 209         case IP6M_HOME_TEST_INIT:
 210         case IP6M_CAREOF_TEST_INIT:
 211                 printf("mobility: %soTI",
 212                         type == IP6M_HOME_TEST_INIT ? "H" : "C");
 213                 hlen = IP6M_MINLEN;
 214                 if (vflag) {
 215                         TCHECK2(*mh, hlen + 8);
 216                         printf(" %s Init Cookie=%08x:%08x",
 217                                type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 218                                EXTRACT_32BITS(&bp[hlen]),
 219                                EXTRACT_32BITS(&bp[hlen + 4]));
 220                 }
 221                 hlen += 8;
 222                 break;
 223         case IP6M_HOME_TEST:
 224         case IP6M_CAREOF_TEST:
 225                 printf("mobility: %soT",
 226                         type == IP6M_HOME_TEST ? "H" : "C");
 227                 TCHECK(mh->ip6m_data16[0]);
 228                 printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 229                 hlen = IP6M_MINLEN;
 230                 if (vflag) {
 231                         TCHECK2(*mh, hlen + 8);
 232                         printf(" %s Init Cookie=%08x:%08x",
 233                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 234                                EXTRACT_32BITS(&bp[hlen]),
 235                                EXTRACT_32BITS(&bp[hlen + 4]));
 236                 }
 237                 hlen += 8;
 238                 if (vflag) {
 239                         TCHECK2(*mh, hlen + 8);
 240                         printf(" %s Keygen Token=%08x:%08x",
 241                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 242                                EXTRACT_32BITS(&bp[hlen]),
 243                                EXTRACT_32BITS(&bp[hlen + 4]));
 244                 }
 245                 hlen += 8;
 246                 break;
 247         case IP6M_BINDING_UPDATE:
 248                 printf("mobility: BU");
 249                 TCHECK(mh->ip6m_data16[0]);
 250                 printf(" seq#=%d", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 251                 hlen = IP6M_MINLEN;
 252                 TCHECK2(*mh, hlen + 1);
 253                 if (bp[hlen] & 0xf0)
 254                         printf(" ");
 255                 if (bp[hlen] & 0x80)
 256                         printf("A");
 257                 if (bp[hlen] & 0x40)
 258                         printf("H");
 259                 if (bp[hlen] & 0x20)
 260                         printf("L");
 261                 if (bp[hlen] & 0x10)
 262                         printf("K");
 263                 /* Reserved (4bits) */
 264                 hlen += 1;
 265                 /* Reserved (8bits) */
 266                 hlen += 1;
 267                 TCHECK2(*mh, hlen + 2);
 268                 /* units of 4 secs */
 269                 printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
 270                 hlen += 2;
 271                 break;
 272         case IP6M_BINDING_ACK:
 273                 printf("mobility: BA");
 274                 TCHECK(mh->ip6m_data8[0]);
 275                 printf(" status=%d", mh->ip6m_data8[0]);
 276                 if (mh->ip6m_data8[1] & 0x80)
 277                         printf(" K");
 278                 /* Reserved (7bits) */
 279                 hlen = IP6M_MINLEN;
 280                 TCHECK2(*mh, hlen + 2);
 281                 printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
 282                 hlen += 2;
 283                 TCHECK2(*mh, hlen + 2);
 284                 /* units of 4 secs */
 285                 printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
 286                 hlen += 2;
 287                 break;
 288         case IP6M_BINDING_ERROR:
 289                 printf("mobility: BE");
 290                 TCHECK(mh->ip6m_data8[0]);
 291                 printf(" status=%d", mh->ip6m_data8[0]);
 292                 /* Reserved */
 293                 hlen = IP6M_MINLEN;
 294                 TCHECK2(*mh, hlen + 16);
 295                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 296                 hlen += 16;
 297                 break;
 298         default:
 299                 printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
 300                 return(mhlen);
 301                 break;
 302         }
 303         if (vflag)
 304                 mobility_opt_print(&bp[hlen], mhlen - hlen);
 305
 306         return(mhlen);
 307
 308  trunc:
 309         fputs("[|MOBILITY]", stdout);
 310         return(mhlen);
 311 }
 312 #endif /* INET6 */