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 1.2 2002-07-08 08:58:37 fenner 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 #define IP6M_BINDING_REQUEST    0x0000  /* Binding Refresh Request */
  73 #define IP6M_HOME_TEST_INIT     0x0001  /* Home Test Init */
  74 #define IP6M_CAREOF_TEST_INIT   0x0002  /* Care-of Test Init */
  75 #define IP6M_HOME_TEST          0x0003  /* Home Test */
  76 #define IP6M_CAREOF_TEST        0x0004  /* Care-of Test */
  77 #define IP6M_BINDING_UPDATE     0x0005  /* Binding Update */
  78 #define IP6M_BINDING_ACK        0x0006  /* Binding Acknowledgement */
  79 #define IP6M_BINDING_ERROR      0x0007  /* Binding Error */
  80
  81 /* Mobility Header Options */
  82 #define IP6MOPT_MINLEN          2
  83 #define IP6MOPT_PAD1          0x0
  84 #define IP6MOPT_PADN          0x1
  85 #define IP6MOPT_UI            0x2
  86 #define IP6MOPT_UI_MINLEN       4
  87 #define IP6MOPT_ALTCOA        0x3
  88 #define IP6MOPT_ALTCOA_MINLEN  18
  89 #define IP6MOPT_NONCEID       0x4
  90 #define IP6MOPT_NONCEID_MINLEN  6
  91 #define IP6MOPT_AUTH          0x5
  92 #define IP6MOPT_AUTH_MINLEN     2 /* 2+len */
  93
  94 void
  95 mobility_opt_print(const u_char *bp, int len)
  96 {
  97         int i;
  98         int optlen;
  99
 100         for (i = 0; i < len; i += optlen) {
 101                 if (bp[i] == IP6MOPT_PAD1)
 102                         optlen = 1;
 103                 else {
 104                         if (i + 1 < len)
 105                                 optlen = bp[i + 1];
 106                         else
 107                                 goto trunc;
 108                         if (optlen < IP6MOPT_MINLEN)
 109                                 optlen = IP6MOPT_MINLEN;        /* XXX */
 110                 }
 111                 if (i + optlen > len)
 112                         goto trunc;
 113
 114                 switch (bp[i]) {
 115                 case IP6MOPT_PAD1:
 116                         printf("(pad1)");
 117                         break;
 118                 case IP6MOPT_PADN:
 119                         if (len - i < IP6MOPT_MINLEN) {
 120                                 printf("(padn: trunc)");
 121                                 goto trunc;
 122                         }
 123                         printf("(padn)");
 124                         break;
 125                 case IP6MOPT_UI:
 126                         if (len - i < IP6MOPT_UI_MINLEN) {
 127                                 printf("(ui: trunc)");
 128                                 goto trunc;
 129                         }
 130                         printf("(ui: 0x%04x)", EXTRACT_16BITS(&bp[i+2]));
 131                         break;
 132                 case IP6MOPT_ALTCOA:
 133                         if (len - i < IP6MOPT_ALTCOA_MINLEN) {
 134                                 printf("(altcoa: trunc)");
 135                                 goto trunc;
 136                         }
 137                         printf("(alt-CoA: %s)", ip6addr_string(&bp[i+2]));
 138                         break;
 139                 case IP6MOPT_NONCEID:
 140                         if (len - i < IP6MOPT_NONCEID_MINLEN) {
 141                                 printf("(ni: trunc)");
 142                                 goto trunc;
 143                         }
 144                         printf("(ni: ho=0x%04x ci=0x%04x)",
 145                                 EXTRACT_16BITS(&bp[i+2]),
 146                                 EXTRACT_16BITS(&bp[i+4]));
 147                         break;
 148                 case IP6MOPT_AUTH:
 149                         if (len - i < IP6MOPT_AUTH_MINLEN) {
 150                                 printf("(auth: trunc)");
 151                                 goto trunc;
 152                         }
 153                         printf("(auth spi: 0x%08x)",
 154                                 EXTRACT_32BITS(&bp[i+2]));
 155                         break;
 156                 default:
 157                         if (len - i < IP6MOPT_MINLEN) {
 158                                 printf("(sopt_type %d: trunc)", bp[i]);
 159                                 goto trunc;
 160                         }
 161                         printf("(type-0x%02x: len=%d)", bp[i], bp[i + 1]);
 162                         break;
 163                 }
 164         }
 165         return;
 166
 167 trunc:
 168         printf("[trunc] ");
 169 }
 170
 171 /*
 172  * Mobility Header
 173  */
 174 int
 175 mobility_print(const u_char *bp, const u_char *bp2)
 176 {
 177         const struct ip6_mobility *mh;
 178         const struct ip6_hdr *ip6;
 179         const u_char *ep;
 180         int mhlen, hlen, type;
 181
 182         mh = (struct ip6_mobility *)bp;
 183         ip6 = (struct ip6_hdr *)bp2;
 184
 185         /* 'ep' points to the end of available data. */
 186         ep = snapend;
 187
 188         TCHECK(mh->ip6m_len);
 189         mhlen = (int)(mh->ip6m_len << 3);
 190         if (mhlen < IP6M_MINLEN)
 191                 mhlen = IP6M_MINLEN;    /* XXX */
 192
 193         /* XXX ip6m_cksum */
 194
 195         TCHECK(mh->ip6m_type);
 196         type = ntohs(mh->ip6m_type);
 197         switch (type) {
 198         case IP6M_BINDING_REQUEST:
 199                 printf("mobility: BRR");
 200                 hlen = IP6M_MINLEN;
 201                 break;
 202         case IP6M_HOME_TEST_INIT:
 203         case IP6M_CAREOF_TEST_INIT:
 204                 printf("mobility: %soTI",
 205                         type == IP6M_HOME_TEST_INIT ? "H" : "C");
 206                 hlen = IP6M_MINLEN;
 207                 TCHECK2(*mh, hlen + 4);
 208                 printf(" cookie=0x%x", EXTRACT_32BITS(&bp[hlen]));
 209                 hlen += 4;
 210                 break;
 211         case IP6M_HOME_TEST:
 212         case IP6M_CAREOF_TEST:
 213                 printf("mobility: %soT",
 214                         type == IP6M_HOME_TEST ? "H" : "C");
 215                 hlen = IP6M_MINLEN;
 216                 TCHECK2(*mh, hlen + 2);
 217                 printf(" nonce id=0x%x", EXTRACT_16BITS(&bp[hlen]));
 218                 hlen += 2;
 219                 /* Reserved (16bits) */
 220                 hlen += 2;
 221                 TCHECK2(*mh, hlen + 4);
 222                 printf(" mobile cookie=0x%x", EXTRACT_32BITS(&bp[hlen]));
 223                 hlen += 4;
 224                 /* Home(Care-of) Cookie (128 bits) */
 225                 hlen += 16;
 226                 break;
 227         case IP6M_BINDING_UPDATE:
 228                 printf("mobility: BU");
 229                 TCHECK(mh->ip6m_data8[0]);
 230                 if (mh->ip6m_data8[0] & 0xf0)
 231                         printf(" ");
 232                 if (mh->ip6m_data8[0] & 0x80)
 233                         printf("A");
 234                 if (mh->ip6m_data8[0] & 0x40)
 235                         printf("H");
 236                 if (mh->ip6m_data8[0] & 0x20)
 237                         printf("S");
 238                 if (mh->ip6m_data8[0] & 0x10)
 239                         printf("D");
 240                 hlen = IP6M_MINLEN;
 241                 TCHECK2(*mh, hlen + 2);
 242                 printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
 243                 hlen += 2;
 244                 /* Reserved (16bits) */
 245                 hlen += 2;
 246                 TCHECK2(*mh, hlen + 4);
 247                 printf(" lifetime=%d", EXTRACT_32BITS(&bp[hlen]));
 248                 hlen += 4;
 249                 TCHECK2(*mh, hlen + 16);
 250                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 251                 hlen += 16;
 252                 break;
 253         case IP6M_BINDING_ACK:
 254                 printf("mobility: BA");
 255                 TCHECK(mh->ip6m_data8[0]);
 256                 printf(" status=%d", mh->ip6m_data8[0]);
 257                 hlen = IP6M_MINLEN;
 258                 TCHECK2(*mh, hlen + 2);
 259                 printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
 260                 hlen += 2;
 261                 /* Reserved (16bits) */
 262                 hlen += 2;
 263                 TCHECK2(*mh, hlen + 4);
 264                 printf(" lifetime=%d", EXTRACT_32BITS(&bp[hlen]));
 265                 hlen += 4;
 266                 TCHECK2(*mh, hlen + 4);
 267                 printf(" refresh=%d", ntohl(*(u_int32_t *)&bp[hlen]));
 268                 hlen += 4;
 269                 break;
 270         case IP6M_BINDING_ERROR:
 271                 printf("mobility: BE");
 272                 TCHECK(mh->ip6m_data8[0]);
 273                 printf(" status=%d", mh->ip6m_data8[0]);
 274                 hlen = IP6M_MINLEN;
 275                 TCHECK2(*mh, hlen + 16);
 276                 printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
 277                 hlen += 16;
 278                 break;
 279         default:
 280                 printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
 281                 return(mhlen);
 282                 break;
 283         }
 284         if (vflag)
 285                 mobility_opt_print(&bp[hlen], mhlen - hlen);
 286
 287         return(mhlen);
 288
 289  trunc:
 290         fputs("[|MOBILITY]", stdout);
 291         return(mhlen);
 292 }
 293 #endif /* INET6 */