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 /* message type */
  64 #define IP6M_BINDING_REQUEST    0       /* Binding Refresh Request */
  65 #define IP6M_HOME_TEST_INIT     1       /* Home Test Init */
  66 #define IP6M_CAREOF_TEST_INIT   2       /* Care-of Test Init */
  67 #define IP6M_HOME_TEST          3       /* Home Test */
  68 #define IP6M_CAREOF_TEST        4       /* Care-of Test */
  69 #define IP6M_BINDING_UPDATE     5       /* Binding Update */
  70 #define IP6M_BINDING_ACK        6       /* Binding Acknowledgement */
  71 #define IP6M_BINDING_ERROR      7       /* Binding Error */
  72
  73 /* Mobility Header Options */
  74 #define IP6MOPT_MINLEN          2
  75 #define IP6MOPT_PAD1          0x0       /* Pad1 */
  76 #define IP6MOPT_PADN          0x1       /* PadN */
  77 #define IP6MOPT_REFRESH       0x2       /* Binding Refresh Advice */
  78 #define IP6MOPT_REFRESH_MINLEN  4
  79 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
  80 #define IP6MOPT_ALTCOA_MINLEN  18
  81 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
  82 #define IP6MOPT_NONCEID_MINLEN  6
  83 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
  84 #define IP6MOPT_AUTH_MINLEN    12
  85
  86 static void
  87 mobility_opt_print(const u_char *bp, const unsigned len)
  88 {
  89         unsigned i, optlen;
  90
  91         for (i = 0; i < len; i += optlen) {
  92                 if (bp[i] == IP6MOPT_PAD1)
  93                         optlen = 1;
  94                 else {
  95                         if (i + 1 < len)
  96                                 optlen = bp[i + 1] + 2;
  97                         else
  98                                 goto trunc;
  99                 }
 100                 if (i + optlen > len)
 101                         goto trunc;
 102
 103                 switch (bp[i]) {
 104                 case IP6MOPT_PAD1:
 105                         printf("(pad1)");
 106                         break;
 107                 case IP6MOPT_PADN:
 108                         if (len - i < IP6MOPT_MINLEN) {
 109                                 printf("(padn: trunc)");
 110                                 goto trunc;
 111                         }
 112                         printf("(padn)");
 113                         break;
 114                 case IP6MOPT_REFRESH:
 115                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 116                                 printf("(refresh: trunc)");
 117                                 goto trunc;
 118                         }
 119                         /* units of 4 secs */
 120                         printf("(refresh: %u)",
 121                                 EXTRACT_16BITS(&bp[i+2]) << 2);
 122                         break;
 123                 case IP6MOPT_ALTCOA:
 124                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 125                                 printf("(altcoa: trunc)");
 126                                 goto trunc;
 127                         }
 128                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 129                         break;
 130                 case IP6MOPT_NONCEID:
 131                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 132                                 printf("(ni: trunc)");
 133                                 goto trunc;
 134                         }
 135                         printf("(ni: ho=0x%04x co=0x%04x)",
 136                                 EXTRACT_16BITS(&bp[i+2]),
 137                                 EXTRACT_16BITS(&bp[i+4]));
 138                         break;
 139                 case IP6MOPT_AUTH:
 140                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 141                                 printf("(auth: trunc)");
 142                                 goto trunc;
 143                         }
 144                         printf("(auth)");
 145                         break;
 146                 default:
 147                         if (len - i < IP6MOPT_MINLEN) {
 148                                 printf("(sopt_type %u: trunc)", bp[i]);
 149                                 goto trunc;
 150                         }
 151                         printf("(type-0x%02x: len=%u)", bp[i], bp[i + 1]);
 152                         break;
 153                 }
 154         }
 155         return;
 156
 157 trunc:
 158         printf("[trunc] ");
 159 }
 160
 161 /*
 162  * Mobility Header
 163  */
 164 int
 165 mobility_print(const u_char *bp, const u_char *bp2 _U_)
 166 {
 167         const struct ip6_mobility *mh;
 168         const u_char *ep;
 169         unsigned mhlen, hlen;
 170         u_int8_t type;
 171
 172         mh = (struct ip6_mobility *)bp;
 173
 174         /* 'ep' points to the end of available data. */
 175         ep = snapend;
 176
 177         if (!TTEST(mh->ip6m_len)) {
 178                 /*
 179                  * There's not enough captured data to include the
 180                  * mobility header length.
 181                  *
 182                  * Our caller expects us to return the length, however,
 183                  * so return a value that will run to the end of the
 184                  * captured data.
 185                  *
 186                  * XXX - "ip6_print()" doesn't do anything with the
 187                  * returned length, however, as it breaks out of the
 188                  * header-processing loop.
 189                  */
 190                 mhlen = ep - bp;
 191                 goto trunc;
 192         }
 193         mhlen = (mh->ip6m_len + 1) << 3;
 194
 195         /* XXX ip6m_cksum */
 196
 197         TCHECK(mh->ip6m_type);
 198         type = mh->ip6m_type;
 199         switch (type) {
 200         case IP6M_BINDING_REQUEST:
 201                 printf("mobility: BRR");
 202                 hlen = IP6M_MINLEN;
 203                 break;
 204         case IP6M_HOME_TEST_INIT:
 205         case IP6M_CAREOF_TEST_INIT:
 206                 printf("mobility: %soTI",
 207                         type == IP6M_HOME_TEST_INIT ? "H" : "C");
 208                 hlen = IP6M_MINLEN;
 209                 if (vflag) {
 210                         TCHECK2(*mh, hlen + 8);
 211                         printf(" %s Init Cookie=%08x:%08x",
 212                                type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
 213                                EXTRACT_32BITS(&bp[hlen]),
 214                                EXTRACT_32BITS(&bp[hlen + 4]));
 215                 }
 216                 hlen += 8;
 217                 break;
 218         case IP6M_HOME_TEST:
 219         case IP6M_CAREOF_TEST:
 220                 printf("mobility: %soT",
 221                         type == IP6M_HOME_TEST ? "H" : "C");
 222                 TCHECK(mh->ip6m_data16[0]);
 223                 printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 224                 hlen = IP6M_MINLEN;
 225                 if (vflag) {
 226                         TCHECK2(*mh, hlen + 8);
 227                         printf(" %s Init Cookie=%08x:%08x",
 228                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 229                                EXTRACT_32BITS(&bp[hlen]),
 230                                EXTRACT_32BITS(&bp[hlen + 4]));
 231                 }
 232                 hlen += 8;
 233                 if (vflag) {
 234                         TCHECK2(*mh, hlen + 8);
 235                         printf(" %s Keygen Token=%08x:%08x",
 236                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 237                                EXTRACT_32BITS(&bp[hlen]),
 238                                EXTRACT_32BITS(&bp[hlen + 4]));
 239                 }
 240                 hlen += 8;
 241                 break;
 242         case IP6M_BINDING_UPDATE:
 243                 printf("mobility: BU");
 244                 TCHECK(mh->ip6m_data16[0]);
 245                 printf(" seq#=%u", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 246                 hlen = IP6M_MINLEN;
 247                 TCHECK2(*mh, hlen + 1);
 248                 if (bp[hlen] & 0xf0)
 249                         printf(" ");
 250                 if (bp[hlen] & 0x80)
 251                         printf("A");
 252                 if (bp[hlen] & 0x40)
 253                         printf("H");
 254                 if (bp[hlen] & 0x20)
 255                         printf("L");
 256                 if (bp[hlen] & 0x10)
 257                         printf("K");
 258                 /* Reserved (4bits) */
 259                 hlen += 1;
 260                 /* Reserved (8bits) */
 261                 hlen += 1;
 262                 TCHECK2(*mh, hlen + 2);
 263                 /* units of 4 secs */
 264                 printf(" lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2);
 265                 hlen += 2;
 266                 break;
 267         case IP6M_BINDING_ACK:
 268                 printf("mobility: BA");
 269                 TCHECK(mh->ip6m_data8[0]);
 270                 printf(" status=%u", mh->ip6m_data8[0]);
 271                 if (mh->ip6m_data8[1] & 0x80)
 272                         printf(" K");
 273                 /* Reserved (7bits) */
 274                 hlen = IP6M_MINLEN;
 275                 TCHECK2(*mh, hlen + 2);
 276                 printf(" seq#=%u", EXTRACT_16BITS(&bp[hlen]));
 277                 hlen += 2;
 278                 TCHECK2(*mh, hlen + 2);
 279                 /* units of 4 secs */
 280                 printf(" lifetime=%u", EXTRACT_16BITS(&bp[hlen]) << 2);
 281                 hlen += 2;
 282                 break;
 283         case IP6M_BINDING_ERROR:
 284                 printf("mobility: BE");
 285                 TCHECK(mh->ip6m_data8[0]);
 286                 printf(" status=%u", mh->ip6m_data8[0]);
 287                 /* Reserved */
 288                 hlen = IP6M_MINLEN;
 289                 TCHECK2(*mh, hlen + 16);
 290                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 291                 hlen += 16;
 292                 break;
 293         default:
 294                 printf("mobility: type-#%u len=%u", type, mh->ip6m_len);
 295                 return(mhlen);
 296                 break;
 297         }
 298         if (vflag)
 299                 mobility_opt_print(&bp[hlen], mhlen - hlen);
 300
 301         return(mhlen);
 302
 303  trunc:
 304         fputs("[|MOBILITY]", stdout);
 305         return(mhlen);
 306 }
 307 #endif /* INET6 */