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 #ifndef lint
  35 static const char rcsid[] =
  36      "@(#) $Header: /tcpdump/master/tcpdump/print-mobility.c,v 1.8 2002-12-11 07:14:05 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 /*                            0x2       /* reserved */
  83 #define IP6MOPT_ALTCOA        0x3       /* Alternate Care-of Address */
  84 #define IP6MOPT_ALTCOA_MINLEN  18
  85 #define IP6MOPT_NONCEID       0x4       /* Nonce Indices */
  86 #define IP6MOPT_NONCEID_MINLEN  6
  87 #define IP6MOPT_AUTH          0x5       /* Binding Authorization Data */
  88 #define IP6MOPT_AUTH_MINLEN    12
  89 #define IP6MOPT_REFRESH       0x6       /* Binding Refresh Advice */
  90 #define IP6MOPT_REFRESH_MINLEN  4
  91
  92 static void
  93 mobility_opt_print(const u_char *bp, int len)
  94 {
  95         int i;
  96         int 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_ALTCOA:
 122                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 123                                 printf("(altcoa: trunc)");
 124                                 goto trunc;
 125                         }
 126                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 127                         break;
 128                 case IP6MOPT_NONCEID:
 129                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 130                                 printf("(ni: trunc)");
 131                                 goto trunc;
 132                         }
 133                         printf("(ni: ho=0x%04x ci=0x%04x)",
 134                                 EXTRACT_16BITS(&bp[i+2]),
 135                                 EXTRACT_16BITS(&bp[i+4]));
 136                         break;
 137                 case IP6MOPT_AUTH:
 138                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 139                                 printf("(auth: trunc)");
 140                                 goto trunc;
 141                         }
 142                         printf("(auth)");
 143                         break;
 144                 case IP6MOPT_REFRESH:
 145                         if (len - i < IP6MOPT_REFRESH_MINLEN) {
 146                                 printf("(refresh: trunc)");
 147                                 goto trunc;
 148                         }
 149                         /* units of 4 secs */
 150                         printf("(refresh: %d)",
 151                                 EXTRACT_16BITS(&bp[i+2]) << 2);
 152                         break;
 153                 default:
 154                         if (len - i < IP6MOPT_MINLEN) {
 155                                 printf("(sopt_type %d: trunc)", bp[i]);
 156                                 goto trunc;
 157                         }
 158                         printf("(type-0x%02x: len=%d)", 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)
 173 {
 174         const struct ip6_mobility *mh;
 175         const struct ip6_hdr *ip6;
 176         const u_char *ep;
 177         int mhlen, hlen, type;
 178
 179         mh = (struct ip6_mobility *)bp;
 180         ip6 = (struct ip6_hdr *)bp2;
 181
 182         /* 'ep' points to the end of available data. */
 183         ep = snapend;
 184
 185         if (!TTEST(mh->ip6m_len)) {
 186                 /*
 187                  * There's not enough captured data to include the
 188                  * mobility header length.
 189                  *
 190                  * Our caller expects us to return the length, however,
 191                  * so return a value that will run to the end of the
 192                  * captured data.
 193                  *
 194                  * XXX - "ip6_print()" doesn't do anything with the
 195                  * returned length, however, as it breaks out of the
 196                  * header-processing loop.
 197                  */
 198                 mhlen = ep - bp;
 199                 goto trunc;
 200         }
 201         mhlen = (int)((mh->ip6m_len + 1) << 3);
 202
 203         /* XXX ip6m_cksum */
 204
 205         TCHECK(mh->ip6m_type);
 206         type = mh->ip6m_type;
 207         switch (type) {
 208         case IP6M_BINDING_REQUEST:
 209                 printf("mobility: BRR");
 210                 hlen = IP6M_MINLEN;
 211                 break;
 212         case IP6M_HOME_TEST_INIT:
 213         case IP6M_CAREOF_TEST_INIT:
 214                 printf("mobility: %soTI",
 215                         type == IP6M_HOME_TEST_INIT ? "H" : "C");
 216                 hlen = IP6M_MINLEN;
 217                 if (vflag) {
 218                         TCHECK2(*mh, hlen + 8);
 219                         printf(" %soT cookie=%08x:%08x",
 220                                type == IP6M_HOME_TEST_INIT ? "H" : "C",
 221                                EXTRACT_32BITS(&bp[hlen]),
 222                                EXTRACT_32BITS(&bp[hlen + 4]));
 223                 }
 224                 hlen += 8;
 225                 break;
 226         case IP6M_HOME_TEST:
 227         case IP6M_CAREOF_TEST:
 228                 printf("mobility: %soT",
 229                         type == IP6M_HOME_TEST ? "H" : "C");
 230                 TCHECK(mh->ip6m_data16[0]);
 231                 printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 232                 hlen = IP6M_MINLEN;
 233                 if (vflag) {
 234                         TCHECK2(*mh, hlen + 8);
 235                         printf(" %soTI cookie=%08x:%08x",
 236                                type == IP6M_HOME_TEST ? "H" : "C",
 237                                EXTRACT_32BITS(&bp[hlen]),
 238                                EXTRACT_32BITS(&bp[hlen + 4]));
 239                 }
 240                 hlen += 8;
 241                 if (vflag) {
 242                         TCHECK2(*mh, hlen + 8);
 243                         printf(" %s KN=%08x:%08x",
 244                                type == IP6M_HOME_TEST ? "Home" : "Care-of",
 245                                EXTRACT_32BITS(&bp[hlen]),
 246                                EXTRACT_32BITS(&bp[hlen + 4]));
 247                 }
 248                 hlen += 8;
 249                 break;
 250         case IP6M_BINDING_UPDATE:
 251                 printf("mobility: BU");
 252                 TCHECK(mh->ip6m_data16[0]);
 253                 printf(" seq#=%d", EXTRACT_16BITS(&mh->ip6m_data16[0]));
 254                 hlen = IP6M_MINLEN;
 255                 TCHECK2(*mh, hlen + 1);
 256                 if (bp[hlen] & 0xf8)
 257                         printf(" ");
 258                 if (bp[hlen] & 0x80)
 259                         printf("A");
 260                 if (bp[hlen] & 0x40)
 261                         printf("H");
 262                 if (bp[hlen] & 0x20)
 263                         printf("S");
 264                 if (bp[hlen] & 0x10)
 265                         printf("D");
 266                 if (bp[hlen] & 0x08)
 267                         printf("L");
 268                 /* Reserved (3bits) */
 269                 hlen += 1;
 270                 /* Reserved (8bits) */
 271                 hlen += 1;
 272                 TCHECK2(*mh, hlen + 2);
 273                 /* units of 4 secs */
 274                 printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
 275                 hlen += 2;
 276                 break;
 277         case IP6M_BINDING_ACK:
 278                 printf("mobility: BA");
 279                 TCHECK(mh->ip6m_data8[0]);
 280                 printf(" status=%d", mh->ip6m_data8[0]);
 281                 /* Reserved */
 282                 hlen = IP6M_MINLEN;
 283                 TCHECK2(*mh, hlen + 2);
 284                 printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
 285                 hlen += 2;
 286                 TCHECK2(*mh, hlen + 2);
 287                 /* units of 4 secs */
 288                 printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
 289                 hlen += 2;
 290                 break;
 291         case IP6M_BINDING_ERROR:
 292                 printf("mobility: BE");
 293                 TCHECK(mh->ip6m_data8[0]);
 294                 printf(" status=%d", mh->ip6m_data8[0]);
 295                 /* Reserved */
 296                 hlen = IP6M_MINLEN;
 297                 TCHECK2(*mh, hlen + 16);
 298                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 299                 hlen += 16;
 300                 break;
 301         default:
 302                 printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
 303                 return(mhlen);
 304                 break;
 305         }
 306         if (vflag)
 307                 mobility_opt_print(&bp[hlen], mhlen - hlen);
 308
 309         return(mhlen);
 310
 311  trunc:
 312         fputs("[|MOBILITY]", stdout);
 313         return(mhlen);
 314 }
 315 #endif /* INET6 */