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 1.4 2002-08-02 04:10:14 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_int16_t ip6m_type;    /* message type */
  55         u_int16_t ip6m_cksum;   /* sum of IPv6 pseudo-header and MH */
  56         union {
  57                 u_int16_t       ip6m_un_data16[1]; /* type-specific field */
  58                 u_int8_t        ip6m_un_data8[2];  /* type-specific fiedl */
  59         } ip6m_dataun;
  60 };
  61
  62 #define ip6m_data16     ip6m_dataun.ip6m_un_data16
  63 #define ip6m_data8      ip6m_dataun.ip6m_un_data8
  64
  65 #define IP6M_MINLEN     8
  66
  67 /* message type */
  68 #define IP6M_BINDING_REQUEST    0x0000  /* Binding Refresh Request */
  69 #define IP6M_HOME_TEST_INIT     0x0001  /* Home Test Init */
  70 #define IP6M_CAREOF_TEST_INIT   0x0002  /* Care-of Test Init */
  71 #define IP6M_HOME_TEST          0x0003  /* Home Test */
  72 #define IP6M_CAREOF_TEST        0x0004  /* Care-of Test */
  73 #define IP6M_BINDING_UPDATE     0x0005  /* Binding Update */
  74 #define IP6M_BINDING_ACK        0x0006  /* Binding Acknowledgement */
  75 #define IP6M_BINDING_ERROR      0x0007  /* Binding Error */
  76
  77 /* Mobility Header Options */
  78 #define IP6MOPT_MINLEN          2
  79 #define IP6MOPT_PAD1          0x0
  80 #define IP6MOPT_PADN          0x1
  81 #define IP6MOPT_UI            0x2
  82 #define IP6MOPT_UI_MINLEN       4
  83 #define IP6MOPT_ALTCOA        0x3
  84 #define IP6MOPT_ALTCOA_MINLEN  18
  85 #define IP6MOPT_NONCEID       0x4
  86 #define IP6MOPT_NONCEID_MINLEN  6
  87 #define IP6MOPT_AUTH          0x5
  88 #define IP6MOPT_AUTH_MINLEN     2 /* 2+len */
  89
  90 static void
  91 mobility_opt_print(const u_char *bp, int len)
  92 {
  93         int i;
  94         int optlen;
  95
  96         for (i = 0; i < len; i += optlen) {
  97                 if (bp[i] == IP6MOPT_PAD1)
  98                         optlen = 1;
  99                 else {
 100                         if (i + 1 < len)
 101                                 optlen = bp[i + 1];
 102                         else
 103                                 goto trunc;
 104                         if (optlen < IP6MOPT_MINLEN)
 105                                 optlen = IP6MOPT_MINLEN;        /* XXX */
 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_UI:
 122                         if (len - i < IP6MOPT_UI_MINLEN) {
 123                                 printf("(ui: trunc)");
 124                                 goto trunc;
 125                         }
 126                         printf("(ui: 0x%04x)", EXTRACT_16BITS(&bp[i+2]));
 127                         break;
 128                 case IP6MOPT_ALTCOA:
 129                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 130                                 printf("(altcoa: trunc)");
 131                                 goto trunc;
 132                         }
 133                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 134                         break;
 135                 case IP6MOPT_NONCEID:
 136                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 137                                 printf("(ni: trunc)");
 138                                 goto trunc;
 139                         }
 140                         printf("(ni: ho=0x%04x ci=0x%04x)",
 141                                 EXTRACT_16BITS(&bp[i+2]),
 142                                 EXTRACT_16BITS(&bp[i+4]));
 143                         break;
 144                 case IP6MOPT_AUTH:
 145                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 146                                 printf("(auth: trunc)");
 147                                 goto trunc;
 148                         }
 149                         printf("(auth spi: 0x%08x)",
 150                                 EXTRACT_32BITS(&bp[i+2]));
 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)
 172 {
 173         const struct ip6_mobility *mh;
 174         const struct ip6_hdr *ip6;
 175         const u_char *ep;
 176         int mhlen, hlen, type;
 177
 178         mh = (struct ip6_mobility *)bp;
 179         ip6 = (struct ip6_hdr *)bp2;
 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 = (int)(mh->ip6m_len << 3);
 201         if (mhlen < IP6M_MINLEN)
 202                 mhlen = IP6M_MINLEN;    /* XXX */
 203
 204         /* XXX ip6m_cksum */
 205
 206         TCHECK(mh->ip6m_type);
 207         type = ntohs(mh->ip6m_type);
 208         switch (type) {
 209         case IP6M_BINDING_REQUEST:
 210                 printf("mobility: BRR");
 211                 hlen = IP6M_MINLEN;
 212                 break;
 213         case IP6M_HOME_TEST_INIT:
 214         case IP6M_CAREOF_TEST_INIT:
 215                 printf("mobility: %soTI",
 216                         type == IP6M_HOME_TEST_INIT ? "H" : "C");
 217                 hlen = IP6M_MINLEN;
 218                 TCHECK2(*mh, hlen + 4);
 219                 printf(" cookie=0x%x", EXTRACT_32BITS(&bp[hlen]));
 220                 hlen += 4;
 221                 break;
 222         case IP6M_HOME_TEST:
 223         case IP6M_CAREOF_TEST:
 224                 printf("mobility: %soT",
 225                         type == IP6M_HOME_TEST ? "H" : "C");
 226                 hlen = IP6M_MINLEN;
 227                 TCHECK2(*mh, hlen + 2);
 228                 printf(" nonce id=0x%x", EXTRACT_16BITS(&bp[hlen]));
 229                 hlen += 2;
 230                 /* Reserved (16bits) */
 231                 hlen += 2;
 232                 TCHECK2(*mh, hlen + 4);
 233                 printf(" mobile cookie=0x%x", EXTRACT_32BITS(&bp[hlen]));
 234                 hlen += 4;
 235                 /* Home(Care-of) Cookie (128 bits) */
 236                 hlen += 16;
 237                 break;
 238         case IP6M_BINDING_UPDATE:
 239                 printf("mobility: BU");
 240                 TCHECK(mh->ip6m_data8[0]);
 241                 if (mh->ip6m_data8[0] & 0xf0)
 242                         printf(" ");
 243                 if (mh->ip6m_data8[0] & 0x80)
 244                         printf("A");
 245                 if (mh->ip6m_data8[0] & 0x40)
 246                         printf("H");
 247                 if (mh->ip6m_data8[0] & 0x20)
 248                         printf("S");
 249                 if (mh->ip6m_data8[0] & 0x10)
 250                         printf("D");
 251                 hlen = IP6M_MINLEN;
 252                 TCHECK2(*mh, hlen + 2);
 253                 printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
 254                 hlen += 2;
 255                 /* Reserved (16bits) */
 256                 hlen += 2;
 257                 TCHECK2(*mh, hlen + 4);
 258                 printf(" lifetime=%d", EXTRACT_32BITS(&bp[hlen]));
 259                 hlen += 4;
 260                 TCHECK2(*mh, hlen + 16);
 261                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 262                 hlen += 16;
 263                 break;
 264         case IP6M_BINDING_ACK:
 265                 printf("mobility: BA");
 266                 TCHECK(mh->ip6m_data8[0]);
 267                 printf(" status=%d", mh->ip6m_data8[0]);
 268                 hlen = IP6M_MINLEN;
 269                 TCHECK2(*mh, hlen + 2);
 270                 printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
 271                 hlen += 2;
 272                 /* Reserved (16bits) */
 273                 hlen += 2;
 274                 TCHECK2(*mh, hlen + 4);
 275                 printf(" lifetime=%d", EXTRACT_32BITS(&bp[hlen]));
 276                 hlen += 4;
 277                 TCHECK2(*mh, hlen + 4);
 278                 printf(" refresh=%d", ntohl(*(u_int32_t *)&bp[hlen]));
 279                 hlen += 4;
 280                 break;
 281         case IP6M_BINDING_ERROR:
 282                 printf("mobility: BE");
 283                 TCHECK(mh->ip6m_data8[0]);
 284                 printf(" status=%d", mh->ip6m_data8[0]);
 285                 hlen = IP6M_MINLEN;
 286                 TCHECK2(*mh, hlen + 16);
 287                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 288                 hlen += 16;
 289                 break;
 290         default:
 291                 printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
 292                 return(mhlen);
 293                 break;
 294         }
 295         if (vflag)
 296                 mobility_opt_print(&bp[hlen], mhlen - hlen);
 297
 298         return(mhlen);
 299
 300  trunc:
 301         fputs("[|MOBILITY]", stdout);
 302         return(mhlen);
 303 }
 304 #endif /* INET6 */