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 1.1 2002-06-27 08:22:41 guy Exp $";
  37 #endif
  38
  39 #ifdef INET6
  40 #include <sys/param.h>
  41 #include <sys/time.h>
  42 #include <sys/types.h>
  43 #include <sys/socket.h>
  44
  45 #include <netinet/in.h>
  46 #include <stdio.h>
  47
  48 #include "ip6.h"
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52 #include "extract.h"            /* must come after interface.h */
  53
  54 /* Mobility header */
  55 struct ip6_mobility {
  56         u_int8_t ip6m_pproto;   /* following payload protocol (for PG) */
  57         u_int8_t ip6m_len;      /* length in units of 8 octets */
  58         u_int16_t ip6m_type;    /* message type */
  59         u_int16_t ip6m_cksum;   /* sum of IPv6 pseudo-header and MH */
  60         union {
  61                 u_int16_t       ip6m_un_data16[1]; /* type-specific field */
  62                 u_int8_t        ip6m_un_data8[2];  /* type-specific fiedl */
  63         } ip6m_dataun;
  64 };
  65
  66 #define ip6m_data16     ip6m_dataun.ip6m_un_data16
  67 #define ip6m_data8      ip6m_dataun.ip6m_un_data8
  68
  69 #define IP6M_MINLEN     8
  70
  71 /* message type */
  72 #if BYTE_ORDER == BIG_ENDIAN
  73 #define IP6M_BINDING_REQUEST    0x0000  /* Binding Refresh Request */
  74 #define IP6M_HOME_TEST_INIT     0x0001  /* Home Test Init */
  75 #define IP6M_CAREOF_TEST_INIT   0x0002  /* Care-of Test Init */
  76 #define IP6M_HOME_TEST          0x0003  /* Home Test */
  77 #define IP6M_CAREOF_TEST        0x0004  /* Care-of Test */
  78 #define IP6M_BINDING_UPDATE     0x0005  /* Binding Update */
  79 #define IP6M_BINDING_ACK        0x0006  /* Binding Acknowledgement */
  80 #define IP6M_BINDING_ERROR      0x0007  /* Binding Error */
  81 #else /* BYTE_ORDER == LITTLE_ENDIAN */
  82 #define IP6M_BINDING_REQUEST    0x0000  /* Binding Refresh Request */
  83 #define IP6M_HOME_TEST_INIT     0x0100  /* Home Test Init */
  84 #define IP6M_CAREOF_TEST_INIT   0x0200  /* Care-of Test Init */
  85 #define IP6M_HOME_TEST          0x0300  /* Home Test */
  86 #define IP6M_CAREOF_TEST        0x0400  /* Care-of Test */
  87 #define IP6M_BINDING_UPDATE     0x0500  /* Binding Update */
  88 #define IP6M_BINDING_ACK        0x0600  /* Binding Acknowledgement */
  89 #define IP6M_BINDING_ERROR      0x0700  /* Binding Error */
  90 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
  91
  92 /* Mobility Header Options */
  93 #define IP6MOPT_MINLEN          2
  94 #define IP6MOPT_PAD1          0x0
  95 #define IP6MOPT_PADN          0x1
  96 #define IP6MOPT_UI            0x2
  97 #define IP6MOPT_UI_MINLEN       4
  98 #define IP6MOPT_ALTCOA        0x3
  99 #define IP6MOPT_ALTCOA_MINLEN  18
 100 #define IP6MOPT_NONCEID       0x4
 101 #define IP6MOPT_NONCEID_MINLEN  6
 102 #define IP6MOPT_AUTH          0x5
 103 #define IP6MOPT_AUTH_MINLEN     2 /* 2+len */
 104
 105 void
 106 mobility_opt_print(const u_char *bp, int len)
 107 {
 108         int i;
 109         int optlen;
 110
 111         for (i = 0; i < len; i += optlen) {
 112                 if (bp[i] == IP6MOPT_PAD1)
 113                         optlen = 1;
 114                 else {
 115                         if (i + 1 < len)
 116                                 optlen = bp[i + 1];
 117                         else
 118                                 goto trunc;
 119                         if (optlen < IP6MOPT_MINLEN)
 120                                 optlen = IP6MOPT_MINLEN;        /* XXX */
 121                 }
 122                 if (i + optlen > len)
 123                         goto trunc;
 124
 125                 switch (bp[i]) {
 126                 case IP6MOPT_PAD1:
 127                         printf("(pad1)");
 128                         break;
 129                 case IP6MOPT_PADN:
 130                         if (len - i < IP6MOPT_MINLEN) {
 131                                 printf("(padn: trunc)");
 132                                 goto trunc;
 133                         }
 134                         printf("(padn)");
 135                         break;
 136                 case IP6MOPT_UI:
 137                         if (len - i < IP6MOPT_UI_MINLEN) {
 138                                 printf("(ui: trunc)");
 139                                 goto trunc;
 140                         }
 141                         printf("(ui: 0x%04x)", ntohs(*(u_int16_t *)&bp[i + 2]));
 142                         break;
 143                 case IP6MOPT_ALTCOA:
 144                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 145                                 printf("(altcoa: trunc)");
 146                                 goto trunc;
 147                         }
 148                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 149                         break;
 150                 case IP6MOPT_NONCEID:
 151                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 152                                 printf("(ni: trunc)");
 153                                 goto trunc;
 154                         }
 155                         printf("(ni: ho=0x%04x ci=0x%04x)",
 156                                 ntohs(*(u_int16_t *)&bp[i + 2]),
 157                                 ntohs(*(u_int16_t *)&bp[i + 4]));
 158                         break;
 159                 case IP6MOPT_AUTH:
 160                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 161                                 printf("(auth: trunc)");
 162                                 goto trunc;
 163                         }
 164                         printf("(auth spi: 0x%08x)",
 165                                 (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 2]));
 166                         break;
 167                 default:
 168                         if (len - i < IP6MOPT_MINLEN) {
 169                                 printf("(sopt_type %d: trunc)", bp[i]);
 170                                 goto trunc;
 171                         }
 172                         printf("(type-0x%02x: len=%d)", bp[i], bp[i + 1]);
 173                         break;
 174                 }
 175         }
 176         return;
 177
 178 trunc:
 179         printf("[trunc] ");
 180 }
 181
 182 /*
 183  * Mobility Header
 184  */
 185 int
 186 mobility_print(const u_char *bp, const u_char *bp2)
 187 {
 188         const struct ip6_mobility *mh;
 189         const struct ip6_hdr *ip6;
 190         const u_char *ep;
 191         int mhlen, hlen;
 192
 193         mh = (struct ip6_mobility *)bp;
 194         ip6 = (struct ip6_hdr *)bp2;
 195
 196         /* 'ep' points to the end of available data. */
 197         ep = snapend;
 198
 199         TCHECK(mh->ip6m_len);
 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         switch (mh->ip6m_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                         mh->ip6m_type == IP6M_HOME_TEST_INIT ? "H" : "C");
 216                 hlen = IP6M_MINLEN;
 217                 TCHECK2(*mh, hlen + 4);
 218                 printf(" cookie=0x%x", ntohl(*(u_int32_t *)&bp[hlen]));
 219                 hlen += 4;
 220                 break;
 221         case IP6M_HOME_TEST:
 222         case IP6M_CAREOF_TEST:
 223                 printf("mobility: %soT",
 224                         mh->ip6m_type == IP6M_HOME_TEST ? "H" : "C");
 225                 hlen = IP6M_MINLEN;
 226                 TCHECK2(*mh, hlen + 2);
 227                 printf(" nonce id=0x%x", ntohs(*(u_int16_t *)&bp[hlen]));
 228                 hlen += 2;
 229                 /* Reserved (16bits) */
 230                 hlen += 2;
 231                 TCHECK2(*mh, hlen + 4);
 232                 printf(" mobile cookie=0x%x", ntohl(*(u_int32_t *)&bp[hlen]));
 233                 hlen += 4;
 234                 /* Home(Care-of) Cookie (128 bits) */
 235                 hlen += 16;
 236                 break;
 237         case IP6M_BINDING_UPDATE:
 238                 printf("mobility: BU");
 239                 TCHECK(mh->ip6m_data8[0]);
 240                 if (mh->ip6m_data8[0] & 0xf0)
 241                         printf(" ");
 242                 if (mh->ip6m_data8[0] & 0x80)
 243                         printf("A");
 244                 if (mh->ip6m_data8[0] & 0x40)
 245                         printf("H");
 246                 if (mh->ip6m_data8[0] & 0x20)
 247                         printf("S");
 248                 if (mh->ip6m_data8[0] & 0x10)
 249                         printf("D");
 250                 hlen = IP6M_MINLEN;
 251                 TCHECK2(*mh, hlen + 2);
 252                 printf(" seq#=%d", ntohs(*(u_int16_t *)&bp[hlen]));
 253                 hlen += 2;
 254                 /* Reserved (16bits) */
 255                 hlen += 2;
 256                 TCHECK2(*mh, hlen + 4);
 257                 printf(" lifetime=%d", ntohl(*(u_int32_t *)&bp[hlen]));
 258                 hlen += 4;
 259                 TCHECK2(*mh, hlen + 16);
 260                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 261                 hlen += 16;
 262                 break;
 263         case IP6M_BINDING_ACK:
 264                 printf("mobility: BA");
 265                 TCHECK(mh->ip6m_data8[0]);
 266                 printf(" status=%d", mh->ip6m_data8[0]);
 267                 hlen = IP6M_MINLEN;
 268                 TCHECK2(*mh, hlen + 2);
 269                 printf(" seq#=%d", ntohs(*(u_int16_t *)&bp[hlen]));
 270                 hlen += 2;
 271                 /* Reserved (16bits) */
 272                 hlen += 2;
 273                 TCHECK2(*mh, hlen + 4);
 274                 printf(" lifetime=%d", ntohl(*(u_int32_t *)&bp[hlen]));
 275                 hlen += 4;
 276                 TCHECK2(*mh, hlen + 4);
 277                 printf(" refresh=%d", ntohl(*(u_int32_t *)&bp[hlen]));
 278                 hlen += 4;
 279                 break;
 280         case IP6M_BINDING_ERROR:
 281                 printf("mobility: BE");
 282                 TCHECK(mh->ip6m_data8[0]);
 283                 printf(" status=%d", mh->ip6m_data8[0]);
 284                 hlen = IP6M_MINLEN;
 285                 TCHECK2(*mh, hlen + 16);
 286                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 287                 hlen += 16;
 288                 break;
 289         default:
 290                 printf("mobility: type-#%d len=%d", ntohs(mh->ip6m_type),
 291                         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 */