packet-ipv6.c

   1 /* packet-ipv6.c
   2  * Routines for IPv6 packet disassembly
   3  *
   4  * $Id: packet-ipv6.c,v 1.51 2001/01/23 02:49:55 gerald Exp $
   5  *
   6  * Ethereal - Network traffic analyzer
   7  * By Gerald Combs <gerald@ethereal.com>
   8  *
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * MobileIPv6 support added by Tomislav Borosa <tomislav.borosa@siemens.hr>
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #ifdef HAVE_SYS_TYPES_H
  33 # include <sys/types.h>
  34 #endif
  35
  36 #ifdef HAVE_SYS_SOCKET_h
  37 #include <sys/socket.h>
  38 #endif
  39
  40 #ifdef HAVE_NETINET_IN_H
  41 # include <netinet/in.h>
  42 #endif
  43
  44 #include <string.h>
  45 #include <stdio.h>
  46 #include <glib.h>
  47 #include "etypes.h"
  48 #include "ppptypes.h"
  49 #include "aftypes.h"
  50 #include "packet.h"
  51 #include "packet-ip.h"
  52 #include "packet-ipsec.h"
  53 #include "packet-ipv6.h"
  54 #include "packet-tcp.h"
  55 #include "packet-udp.h"
  56 #include "resolv.h"
  57
  58 /*
  59  * NOTE: ipv6.nxt is not very useful as we will have chained header.
  60  * now testing ipv6.final, but it raises SEGV.
  61 #define TEST_FINALHDR
  62  */
  63
  64 static int proto_ipv6 = -1;
  65 static int hf_ipv6_version = -1;
  66 static int hf_ipv6_class = -1;
  67 static int hf_ipv6_flow = -1;
  68 static int hf_ipv6_plen = -1;
  69 static int hf_ipv6_nxt = -1;
  70 static int hf_ipv6_hlim = -1;
  71 static int hf_ipv6_src = -1;
  72 static int hf_ipv6_dst = -1;
  73 static int hf_ipv6_addr = -1;
  74 #ifdef TEST_FINALHDR
  75 static int hf_ipv6_final = -1;
  76 #endif
  77
  78 /* BT INSERT BEGIN */
  79 static int hf_ipv6_mipv6_type = -1;
  80 static int hf_ipv6_mipv6_length = -1;
  81 static int hf_ipv6_mipv6_a_flag = -1;
  82 static int hf_ipv6_mipv6_h_flag = -1;
  83 static int hf_ipv6_mipv6_r_flag = -1;
  84 static int hf_ipv6_mipv6_d_flag = -1;
  85 static int hf_ipv6_mipv6_m_flag = -1;
  86 static int hf_ipv6_mipv6_b_flag = -1;
  87 static int hf_ipv6_mipv6_prefix_length = -1;
  88 static int hf_ipv6_mipv6_sequence_number = -1;
  89 static int hf_ipv6_mipv6_life_time = -1;
  90 static int hf_ipv6_mipv6_status = -1;
  91 static int hf_ipv6_mipv6_refresh = -1;
  92 static int hf_ipv6_mipv6_home_address = -1;
  93 static int hf_ipv6_mipv6_sub_type = -1;
  94 static int hf_ipv6_mipv6_sub_length = -1;
  95 static int hf_ipv6_mipv6_sub_unique_ID = -1;
  96 static int hf_ipv6_mipv6_sub_alternative_COA = -1;
  97 /* BT INSERT END */
  98
  99 static gint ett_ipv6 = -1;
 100
 101 #ifndef offsetof
 102 #define offsetof(type, member)  ((size_t)(&((type *)0)->member))
 103 #endif
 104
 105 static int
 106 dissect_routing6(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 107     struct ip6_rthdr rt;
 108     int len;
 109     proto_tree *rthdr_tree;
 110         proto_item *ti;
 111     char buf[sizeof(struct ip6_rthdr0) + sizeof(struct e_in6_addr) * 23];
 112
 113     memcpy(&rt, (void *) &pd[offset], sizeof(rt));
 114     len = (rt.ip6r_len + 1) << 3;
 115
 116     if (tree) {
 117         /* !!! specify length */
 118         ti = proto_tree_add_text(tree, NullTVB, offset, len,
 119             "Routing Header, Type %u", rt.ip6r_type);
 120         rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
 121
 122         proto_tree_add_text(rthdr_tree, NullTVB,
 123             offset + offsetof(struct ip6_rthdr, ip6r_nxt), 1,
 124             "Next header: %s (0x%02x)", ipprotostr(rt.ip6r_nxt), rt.ip6r_nxt);
 125         proto_tree_add_text(rthdr_tree, NullTVB,
 126             offset + offsetof(struct ip6_rthdr, ip6r_len), 1,
 127             "Length: %u (%d bytes)", rt.ip6r_len, len);
 128         proto_tree_add_text(rthdr_tree, NullTVB,
 129             offset + offsetof(struct ip6_rthdr, ip6r_type), 1,
 130             "Type: %u", rt.ip6r_type);
 131         proto_tree_add_text(rthdr_tree, NullTVB,
 132             offset + offsetof(struct ip6_rthdr, ip6r_segleft), 1,
 133             "Segments left: %u", rt.ip6r_segleft);
 134
 135         if (rt.ip6r_type == 0 && len <= sizeof(buf)) {
 136             struct e_in6_addr *a;
 137             int n;
 138             struct ip6_rthdr0 *rt0;
 139
 140             memcpy(buf, (void *) &pd[offset], len);
 141             rt0 = (struct ip6_rthdr0 *)buf;
 142             for (a = rt0->ip6r0_addr, n = 0;
 143                  a < (struct e_in6_addr *)(buf + len);
 144                  a++, n++) {
 145                 proto_tree_add_text(rthdr_tree, NullTVB,
 146                     offset + offsetof(struct ip6_rthdr0, ip6r0_addr) + n * sizeof(struct e_in6_addr),
 147                     sizeof(struct e_in6_addr),
 148 #ifdef INET6
 149                     "address %d: %s (%s)",
 150                     n, get_hostname6(a), ip6_to_str(a)
 151 #else
 152                     "address %d: %s", n, ip6_to_str(a)
 153 #endif
 154                     );
 155             }
 156         }
 157
 158         /* decode... */
 159     }
 160
 161     return len;
 162 }
 163
 164 static int
 165 dissect_frag6(const u_char *pd, int offset, frame_data *fd, proto_tree *tree,
 166     int *fragstart) {
 167     struct ip6_frag frag;
 168     int len;
 169     proto_item *ti;
 170     proto_tree *rthdr_tree;
 171
 172     memcpy(&frag, (void *) &pd[offset], sizeof(frag));
 173     len = sizeof(frag);
 174     frag.ip6f_offlg = ntohs(frag.ip6f_offlg);
 175     *fragstart = frag.ip6f_offlg & IP6F_OFF_MASK;
 176     if (check_col(fd, COL_INFO)) {
 177         col_add_fstr(fd, COL_INFO,
 178             "IPv6 fragment (nxt=%s (0x%02x) off=%u id=0x%x)",
 179             ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt,
 180             *fragstart, frag.ip6f_ident);
 181     }
 182     if (tree) {
 183            ti = proto_tree_add_text(tree, NullTVB, offset, len,
 184                            "Fragmention Header");
 185            rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
 186
 187            proto_tree_add_text(rthdr_tree, NullTVB,
 188                          offset + offsetof(struct ip6_frag, ip6f_nxt), 1,
 189                          "Next header: %s (0x%02x)",
 190                          ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt);
 191
 192         #if 0
 193            proto_tree_add_text(rthdr_tree, NullTVB,
 194                          offset + offsetof(struct ip6_frag, ip6f_reserved), 1,
 195                          "Reserved: %u",
 196                          frag.ip6f_reserved);
 197         #endif
 198
 199            proto_tree_add_text(rthdr_tree, NullTVB,
 200                          offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
 201                          "Offset: %u",
 202                          frag.ip6f_offlg & IP6F_OFF_MASK);
 203
 204            proto_tree_add_text(rthdr_tree, NullTVB,
 205                          offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
 206                          "More fragments: %s",
 207                                 frag.ip6f_offlg & IP6F_MORE_FRAG ?
 208                                 "Yes" : "No");
 209
 210            proto_tree_add_text(rthdr_tree, NullTVB,
 211                          offset + offsetof(struct ip6_frag, ip6f_ident), 4,
 212                          "Identification: 0x%08x",
 213                          frag.ip6f_ident);
 214     }
 215     return len;
 216 }
 217
 218 /* BT INSERT BEGIN */
 219 static int
 220 dissect_mipv6_ba(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset) {
 221         guint8 status, len=0;
 222         gchar status_text[80]="";
 223         gboolean sub_options=FALSE;
 224
 225         proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb, offset+len,
 226         IP6_MIPv6_OPTION_TYPE_LENGTH, tvb_get_guint8(tvb,offset+len),
 227         "Option Type: %u (0x%02x) - Binding Acknowledgement", tvb_get_guint8(tvb,offset+len),
 228         tvb_get_guint8(tvb,offset+len));
 229   len+=IP6_MIPv6_OPTION_TYPE_LENGTH;
 230   if (tvb_get_guint8(tvb,offset+len)>11)
 231                 sub_options=TRUE;
 232   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset+len,
 233         IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb,offset+len));
 234   len+=IP6_MIPv6_OPTION_LENGTH_LENGTH;
 235         status = tvb_get_guint8(tvb,offset+len);
 236         switch (status){
 237                 case BA_OK:
 238                         strcpy(status_text,"- Binding Update accepted");
 239                         break;
 240                 case BA_REAS_UNSPEC:
 241                         strcpy(status_text,"- Binding Update was rejected - Reason unspecified");
 242                         break;
 243                 case BA_ADMIN_PROH:
 244                         strcpy(status_text,"- Binding Update was rejected - Administratively prohibited");
 245                         break;
 246                 case BA_INSUF_RES:
 247                         strcpy(status_text,"- Binding Update was rejected - Insufficient resources");
 248                         break;
 249                 case BA_NO_HR:
 250                         strcpy(status_text,"- Binding Update was rejected - Home registration not supported");
 251                         break;
 252                 case BA_NO_SUBNET:
 253                         strcpy(status_text,"- Binding Update was rejected - Not home subnet");
 254                         break;
 255                 case BA_ERR_ID_LEN:
 256                         strcpy(status_text,"- Binding Update was rejected - Incorrect interface identifier length");
 257                         break;
 258                 case BA_NO_HA:
 259                         strcpy(status_text,"- Binding Update was rejected - Not home agent for this mobile node");
 260                         break;
 261                 case BA_DUPL_ADDR:
 262                         strcpy(status_text,"- Binding Update was rejected - Duplicate Address Detection failed");
 263                         break;
 264                 default:
 265                         strcpy(status_text,"");
 266                         break;
 267         }
 268   if ((status>128)&&(strlen(status_text)==0))
 269                 strcpy(status_text,"- Binding Update was rejected");
 270         proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_status, tvb, offset+len,
 271         IP6_MIPv6_STATUS_LENGTH, tvb_get_guint8(tvb,offset+len),
 272         "Status: %u %s", tvb_get_guint8(tvb,offset+len), status_text);
 273   len+=IP6_MIPv6_STATUS_LENGTH;
 274   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sequence_number, tvb, offset+len,
 275         IP6_MIPv6_SEQUENCE_NUMBER_LENGTH, tvb_get_ntohs(tvb,offset+len));
 276   len+=IP6_MIPv6_SEQUENCE_NUMBER_LENGTH;
 277   if (tvb_get_ntohl(tvb,offset+len)==0xffffffff)
 278         {
 279                 proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_life_time, tvb, offset+len,
 280                 IP6_MIPv6_LIFE_TIME_LENGTH, tvb_get_ntohl(tvb,offset+len),
 281                 "Life Time: %u - Infinity", tvb_get_ntohl(tvb,offset+len));
 282         } else
 283         {
 284                 proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_life_time, tvb, offset+len,
 285                 IP6_MIPv6_LIFE_TIME_LENGTH, tvb_get_ntohl(tvb,offset+len));
 286   }
 287   len+=IP6_MIPv6_LIFE_TIME_LENGTH;
 288         proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_refresh, tvb, offset+len,
 289         IP6_MIPv6_REFRESH_LENGTH, tvb_get_ntohl(tvb,offset+len));
 290   len+=IP6_MIPv6_REFRESH_LENGTH;
 291   /* sub - options */
 292   if (sub_options)
 293   {
 294                 proto_tree_add_text(dstopt_tree, NullTVB, offset+len, 1, "Sub-Options");
 295         }
 296   return len;
 297 }
 298
 299 static int
 300 dissect_mipv6_bu(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset) {
 301         int len=0;
 302         gboolean sub_options=FALSE;
 303
 304         proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb, offset,
 305         IP6_MIPv6_OPTION_TYPE_LENGTH, tvb_get_guint8(tvb,offset),
 306         "Option Type: %u (0x%02x) - Binding Update", tvb_get_guint8(tvb,offset),
 307         tvb_get_guint8(tvb,offset));
 308   len+=IP6_MIPv6_OPTION_TYPE_LENGTH;
 309   if (tvb_get_guint8(tvb,offset+len)>8)
 310   sub_options=TRUE;
 311   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset+len,
 312   IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb,offset+len));
 313   len+=IP6_MIPv6_OPTION_LENGTH_LENGTH;
 314   proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_a_flag, tvb, offset+len,
 315   IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset+len));
 316   proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_h_flag, tvb, offset+len,
 317   IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset+len));
 318   proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_r_flag, tvb, offset+len,
 319   IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset+len));
 320   proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_d_flag, tvb, offset+len,
 321   IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset+len));
 322   proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_m_flag, tvb, offset+len,
 323   IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset+len));
 324   proto_tree_add_boolean(dstopt_tree, hf_ipv6_mipv6_b_flag, tvb, offset+len,
 325   IP6_MIPv6_FLAGS_LENGTH, tvb_get_guint8(tvb, offset+len));
 326   len+=IP6_MIPv6_FLAGS_LENGTH;
 327   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_prefix_length, tvb, offset+len,
 328         IP6_MIPv6_PREFIX_LENGTH_LENGTH, tvb_get_guint8(tvb,offset+len));
 329   len+=IP6_MIPv6_PREFIX_LENGTH_LENGTH;
 330   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sequence_number, tvb, offset+len,
 331         IP6_MIPv6_SEQUENCE_NUMBER_LENGTH, tvb_get_ntohs(tvb,offset+len));
 332   len+=IP6_MIPv6_SEQUENCE_NUMBER_LENGTH;
 333   if (tvb_get_ntohl(tvb,offset+len)==0xffffffff)
 334         {
 335                 proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_life_time, tvb, offset+len,
 336                 IP6_MIPv6_LIFE_TIME_LENGTH, tvb_get_ntohl(tvb,offset+len),
 337                 "Life Time: %u - Infinity", tvb_get_ntohl(tvb,offset+len));
 338         } else
 339         {
 340                 proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_life_time, tvb, offset+len,
 341                 IP6_MIPv6_LIFE_TIME_LENGTH, tvb_get_ntohl(tvb,offset+len));
 342   }
 343   len+=IP6_MIPv6_LIFE_TIME_LENGTH;
 344   /* sub - options */
 345   if (sub_options)
 346   {
 347                 proto_tree_add_text(dstopt_tree, NullTVB, offset+len, 1, "Sub-Options");
 348         }
 349   return len;
 350 }
 351
 352 static int
 353 dissect_mipv6_ha(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset) {
 354         int len=0;
 355         gboolean sub_options=FALSE;
 356
 357         proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb, offset+len,
 358         IP6_MIPv6_OPTION_TYPE_LENGTH, tvb_get_guint8(tvb,offset+len),
 359         "Option Type: %u (0x%02x) - Home Address", tvb_get_guint8(tvb,offset+len),
 360         tvb_get_guint8(tvb,offset+len));
 361   len+=IP6_MIPv6_OPTION_TYPE_LENGTH;
 362   if (tvb_get_guint8(tvb,offset+len)>16)
 363                 sub_options=TRUE;
 364   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset+len,
 365         IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb,offset+len));
 366   len+=IP6_MIPv6_OPTION_LENGTH_LENGTH;
 367   proto_tree_add_ipv6(dstopt_tree, hf_ipv6_mipv6_home_address, tvb, offset+len,
 368         IP6_MIPv6_HOME_ADDRESS_LENGTH, tvb_get_ptr(tvb,offset+len,IP6_MIPv6_HOME_ADDRESS_LENGTH));
 369   len+=IP6_MIPv6_HOME_ADDRESS_LENGTH;
 370   /* sub - options */
 371   if (sub_options)
 372   {
 373                 proto_tree_add_text(dstopt_tree, NullTVB, offset+len, 1, "Sub-Options");
 374         }
 375         return len;
 376 }
 377
 378 static int
 379 dissect_mipv6_br(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset) {
 380         int len=0;
 381         gboolean sub_options=FALSE;
 382
 383         proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb, offset+len,
 384         IP6_MIPv6_OPTION_TYPE_LENGTH, tvb_get_guint8(tvb,offset+len),
 385         "Option Type: %u (0x%02x) - Binding Request", tvb_get_guint8(tvb,offset+len),
 386         tvb_get_guint8(tvb,offset+len));
 387   len+=IP6_MIPv6_OPTION_TYPE_LENGTH;
 388   if (tvb_get_guint8(tvb,offset+len)>0)
 389                 sub_options=TRUE;
 390   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset+len,
 391         IP6_MIPv6_OPTION_LENGTH_LENGTH, tvb_get_guint8(tvb,offset+len));
 392   len+=IP6_MIPv6_OPTION_LENGTH_LENGTH;
 393   /* sub - options */
 394   if (sub_options)
 395   {
 396                 proto_tree_add_text(dstopt_tree, NullTVB, offset+len, 1, "Sub-Options");
 397         }
 398         return len;
 399 }
 400
 401 static int
 402 dissect_mipv6_sub_u(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset) {
 403         int len=0;
 404
 405         proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_sub_length, tvb, offset+len,
 406         IP6_MIPv6_SUB_TYPE_LENGTH, tvb_get_guint8(tvb,offset+len),
 407         "Sub-Option Type: %u (0x%02x) - Unique Identifier Sub-Option", tvb_get_guint8(tvb,offset+len),
 408         tvb_get_guint8(tvb,offset+len));
 409   len+=IP6_MIPv6_SUB_TYPE_LENGTH;
 410   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sub_length, tvb, offset+len,
 411         IP6_MIPv6_SUB_LENGTH_LENGTH, tvb_get_guint8(tvb,offset+len));
 412   len+=IP6_MIPv6_SUB_LENGTH_LENGTH;
 413   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sub_unique_ID, tvb, offset+len,
 414         IP6_MIPv6_SUB_UNIQUE_ID_LENGTH, tvb_get_ntohs(tvb,offset+len));
 415   len+=IP6_MIPv6_SUB_UNIQUE_ID_LENGTH;
 416         return len;
 417 }
 418
 419 static int
 420 dissect_mipv6_sub_a_coa(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset) {
 421         int len=0;
 422
 423         proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_sub_type, tvb, offset+len,
 424         IP6_MIPv6_SUB_TYPE_LENGTH, tvb_get_guint8(tvb,offset+len),
 425         "Sub-Option Type: %u (0x%02x) - Alternative Care Of Address", tvb_get_guint8(tvb,offset+len),
 426         tvb_get_guint8(tvb,offset+len));
 427   len+=IP6_MIPv6_SUB_TYPE_LENGTH;
 428   proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_sub_length, tvb, offset+len,
 429         IP6_MIPv6_SUB_LENGTH_LENGTH, tvb_get_guint8(tvb,offset+len));
 430   len+=IP6_MIPv6_SUB_LENGTH_LENGTH;
 431   proto_tree_add_ipv6(dstopt_tree, hf_ipv6_mipv6_sub_alternative_COA, tvb, offset+len,
 432         IP6_MIPv6_SUB_ALTERNATIVE_COA_LENGTH, tvb_get_ptr(tvb,offset+len,IP6_MIPv6_SUB_ALTERNATIVE_COA_LENGTH));
 433   len+=IP6_MIPv6_SUB_ALTERNATIVE_COA_LENGTH;
 434         return len;
 435 }
 436 /* BT INSERT END */
 437
 438 static int
 439 dissect_opts(const u_char *pd, int offset, frame_data *fd, proto_tree *tree,
 440   char *optname) {
 441         struct ip6_ext ext;
 442   int len;
 443   proto_tree *dstopt_tree;
 444         proto_item *ti;
 445   u_char *p;
 446
 447         /* BT INSERT BEGIN */
 448         tvbuff_t *tvb;
 449   int mip_offset=0, delta=0;
 450   /* BT INSERT END */
 451
 452   static const value_string rtalertvals[] = {
 453         { IP6OPT_RTALERT_MLD, "MLD" },
 454         { IP6OPT_RTALERT_RSVP, "RSVP" },
 455         { 0, NULL },
 456     };
 457
 458   memcpy(&ext, (void *) &pd[offset], sizeof(ext));
 459   len = (ext.ip6e_len + 1) << 3;
 460
 461   /* BT INSERT BEGIN */
 462         tvb = tvb_create_from_top(offset);
 463   /* BT INSERT END */
 464
 465         if (tree) {
 466                 /* !!! specify length */
 467                 ti = proto_tree_add_text(tree, NullTVB, offset, len,
 468             "%s Header ", optname);
 469
 470                 dstopt_tree = proto_item_add_subtree(ti, ett_ipv6);
 471
 472                 proto_tree_add_text(dstopt_tree, NullTVB,
 473                 offset + offsetof(struct ip6_ext, ip6e_nxt), 1,
 474           "Next header: %s (0x%02x)", ipprotostr(ext.ip6e_nxt),ext.ip6e_nxt);
 475     proto_tree_add_text(dstopt_tree, NullTVB,
 476                 offset + offsetof(struct ip6_ext, ip6e_len), 1,
 477           "Length: %u (%d bytes)", ext.ip6e_len, len);
 478
 479     /* BT INSERT BEGIN */
 480     mip_offset+=2;
 481     /* BT INSERT END */
 482
 483                 p = (u_char *)(pd + offset + 2);
 484
 485                 while (p < pd + offset + len) {
 486                 switch (p[0]) {
 487                 case IP6OPT_PAD1:
 488                                         proto_tree_add_text(dstopt_tree, NullTVB, p - pd, 1,
 489                         "Pad1");
 490                                         p++;
 491           /* BT INSERT BEGIN */
 492                                         mip_offset++;
 493           /* BT INSERT END */
 494                                         break;
 495                 case IP6OPT_PADN:
 496                                         proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
 497                         "PadN: %u bytes", p[1] + 2);
 498                                         p += p[1];
 499                                         p += 2;
 500           /* BT INSERT BEGIN */
 501                                         mip_offset+=tvb_get_guint8(tvb,mip_offset+1)+2;
 502           /* BT INSERT END */
 503                                         break;
 504                 case IP6OPT_JUMBO:
 505                                         if (p[1] == 4) {
 506                                 proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
 507                                                 "Jumbo payload: %u (%u bytes)",
 508                                                 pntohl(&p[2]), p[1] + 2);
 509                                         } else {
 510                                 proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
 511                                                 "Jumbo payload: Invalid length (%u bytes)",
 512                                                 p[1] + 2);
 513                                         }
 514                                         p += p[1];
 515                                         p += 2;
 516           /* BT INSERT BEGIN */
 517                                         mip_offset+=tvb_get_guint8(tvb,mip_offset+1)+2;
 518           /* BT INSERT END */
 519                                         break;
 520                 case IP6OPT_RTALERT:
 521                 {
 522                                         char *rta;
 523
 524                                         if (p[1] == 2) {
 525                                 rta = val_to_str(pntohs(&p[2]), rtalertvals,
 526                                                 "Unknown");
 527                                         } else
 528                                 rta = "Invalid length";
 529                                         ti = proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
 530                                         "Router alert: %s (%u bytes)", rta, p[1] + 2);
 531                                         p += p[1];
 532                                         p += 2;
 533                                         /* BT INSERT BEGIN */
 534                                         mip_offset+=tvb_get_guint8(tvb,mip_offset+1)+2;
 535           /* BT INSERT END */
 536                                         break;
 537                 }
 538         /* BT INSERT BEGIN */
 539                         case IP6OPT_BINDING_UPDATE :
 540                 {
 541             delta=dissect_mipv6_bu(tvb, dstopt_tree, mip_offset);
 542                                                 p+=delta;
 543                                                 mip_offset+=delta;
 544                         break;
 545                 }
 546                         case IP6OPT_BINDING_ACK :
 547                 {
 548             delta=dissect_mipv6_ba(tvb, dstopt_tree, mip_offset);
 549                                                 p+=delta;
 550                                                 mip_offset+=delta;
 551                                                 break;
 552                                         }
 553                         case IP6OPT_HOME_ADDRESS :
 554                 {
 555             delta=dissect_mipv6_ha(tvb, dstopt_tree, mip_offset);
 556                                                 p+=delta;
 557                                                 mip_offset+=delta;
 558                                                 break;
 559           }
 560                         case IP6OPT_BINDING_REQUEST :
 561                 {
 562                   delta=dissect_mipv6_br(tvb, dstopt_tree, mip_offset);
 563                                                 p+=delta;
 564                                                 mip_offset+=delta;
 565                                                 break;
 566                                         }
 567                         case IP6OPT_MIPv6_UNIQUE_ID_SUB :
 568                 {
 569                   delta=dissect_mipv6_sub_u(tvb, dstopt_tree, mip_offset);
 570                                                 p+=delta;
 571                                                 mip_offset+=delta;
 572                                                 break;
 573                                         }
 574                         case IP6OPT_MIPv6_ALTERNATIVE_COA_SUB :
 575                 {
 576                   delta=dissect_mipv6_sub_a_coa(tvb, dstopt_tree, mip_offset);
 577                                                 p+=delta;
 578                                                 mip_offset+=delta;
 579                                                 break;
 580                                         }
 581         /* BT INSERT END */
 582                 default:
 583                                         p = (u_char *)(pd + offset + len);
 584                                         break;
 585                 }
 586                 }
 587
 588         /* decode... */
 589
 590         }
 591     return len;
 592 }
 593
 594 static int
 595 dissect_hopopts(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 596     return dissect_opts(pd, offset, fd, tree, "Hop-by-hop Option");
 597 }
 598
 599 static int
 600 dissect_dstopts(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 601     return dissect_opts(pd, offset, fd, tree, "Destination Option");
 602 }
 603
 604 void
 605 dissect_ipv6(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 606   proto_tree *ipv6_tree;
 607   proto_item *ti;
 608   guint8 nxt;
 609   int advance;
 610   int poffset;
 611   int frag;
 612
 613   struct ip6_hdr ipv6;
 614
 615   OLD_CHECK_DISPLAY_AS_DATA(proto_ipv6, pd, offset, fd, tree);
 616
 617   memcpy(&ipv6, (void *) &pd[offset], sizeof(ipv6));
 618
 619   pi.ipproto = ipv6.ip6_nxt; /* XXX make work TCP follow (ipproto = 6) */
 620
 621   SET_ADDRESS(&pi.net_src, AT_IPv6, 16, &pd[offset + IP6H_SRC]);
 622   SET_ADDRESS(&pi.src, AT_IPv6, 16, &pd[offset + IP6H_SRC]);
 623   SET_ADDRESS(&pi.net_dst, AT_IPv6, 16, &pd[offset + IP6H_DST]);
 624   SET_ADDRESS(&pi.dst, AT_IPv6, 16, &pd[offset + IP6H_DST]);
 625
 626   if (tree) {
 627     /* !!! specify length */
 628     ti = proto_tree_add_item(tree, proto_ipv6, NullTVB, offset, 40, FALSE);
 629     ipv6_tree = proto_item_add_subtree(ti, ett_ipv6);
 630
 631     /* !!! warning: version also contains 4 Bit priority */
 632     proto_tree_add_uint(ipv6_tree, hf_ipv6_version, NullTVB,
 633                 offset + offsetof(struct ip6_hdr, ip6_vfc), 1,
 634                 (ipv6.ip6_vfc >> 4) & 0x0f);
 635
 636
 637     proto_tree_add_uint(ipv6_tree, hf_ipv6_class, NullTVB,
 638                 offset + offsetof(struct ip6_hdr, ip6_flow), 4,
 639                 (guint8)((ntohl(ipv6.ip6_flow) >> 20) & 0xff));
 640
 641     /*
 642      * there should be no alignment problems for ip6_flow, since it's the first
 643      * guint32 in the ipv6 struct
 644      */
 645     proto_tree_add_uint_format(ipv6_tree, hf_ipv6_flow, NullTVB,
 646                 offset + offsetof(struct ip6_hdr, ip6_flow), 4,
 647                 (unsigned long)(ntohl(ipv6.ip6_flow) & IPV6_FLOWLABEL_MASK),
 648                 "Flowlabel: 0x%05lx",
 649                 (unsigned long)(ntohl(ipv6.ip6_flow) & IPV6_FLOWLABEL_MASK));
 650
 651     proto_tree_add_uint(ipv6_tree, hf_ipv6_plen, NullTVB,
 652                 offset + offsetof(struct ip6_hdr, ip6_plen), 2,
 653                 ntohs(ipv6.ip6_plen));
 654
 655     proto_tree_add_uint_format(ipv6_tree, hf_ipv6_nxt, NullTVB,
 656                 offset + offsetof(struct ip6_hdr, ip6_nxt), 1,
 657                 ipv6.ip6_nxt,
 658                 "Next header: %s (0x%02x)",
 659                 ipprotostr(ipv6.ip6_nxt), ipv6.ip6_nxt);
 660
 661     proto_tree_add_uint(ipv6_tree, hf_ipv6_hlim, NullTVB,
 662                 offset + offsetof(struct ip6_hdr, ip6_hlim), 1,
 663                 ipv6.ip6_hlim);
 664
 665     proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, NullTVB,
 666                                offset + offsetof(struct ip6_hdr, ip6_src), 16,
 667                                ipv6.ip6_src.s6_addr8);
 668     proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, NullTVB,
 669                                offset + offsetof(struct ip6_hdr, ip6_dst), 16,
 670                                ipv6.ip6_dst.s6_addr8);
 671
 672     proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_src, NullTVB,
 673                 offset + offsetof(struct ip6_hdr, ip6_src), 16,
 674                 (guint8 *)&ipv6.ip6_src,
 675 #ifdef INET6
 676                 "Source address: %s (%s)",
 677                 get_hostname6(&ipv6.ip6_src),
 678 #else
 679                 "Source address: %s",
 680 #endif
 681                 ip6_to_str(&ipv6.ip6_src));
 682
 683     proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_dst, NullTVB,
 684                 offset + offsetof(struct ip6_hdr, ip6_dst), 16,
 685                 (guint8 *)&ipv6.ip6_dst,
 686 #ifdef INET6
 687                 "Destination address: %s (%s)",
 688                 get_hostname6(&ipv6.ip6_dst),
 689 #else
 690                 "Destination address: %s",
 691 #endif
 692                 ip6_to_str(&ipv6.ip6_dst));
 693   }
 694
 695   /* start of the new header (could be a extension header) */
 696   nxt = pd[poffset = offset + offsetof(struct ip6_hdr, ip6_nxt)];
 697   offset += sizeof(struct ip6_hdr);
 698   frag = 0;
 699
 700 /* start out assuming this insn't fragmented */
 701         pi.fragmented = FALSE;
 702
 703 again:
 704     switch (nxt) {
 705     case IP_PROTO_HOPOPTS:
 706                         advance = dissect_hopopts(pd, offset, fd, tree);
 707                         nxt = pd[poffset = offset];
 708                         offset += advance;
 709                         goto again;
 710     case IP_PROTO_ROUTING:
 711                         advance = dissect_routing6(pd, offset, fd, tree);
 712                         nxt = pd[poffset = offset];
 713                         offset += advance;
 714                         goto again;
 715     case IP_PROTO_FRAGMENT:
 716                         pi.fragmented = TRUE;
 717                         advance = dissect_frag6(pd, offset, fd, tree, &frag);
 718                         nxt = pd[poffset = offset];
 719                         offset += advance;
 720                         goto again;
 721     case IP_PROTO_AH:
 722                         advance = dissect_ah_old(pd, offset, fd, tree);
 723                         nxt = pd[poffset = offset];
 724                         offset += advance;
 725         goto again;
 726     case IP_PROTO_DSTOPTS:
 727                         advance = dissect_dstopts(pd, offset, fd, tree);
 728                         nxt = pd[poffset = offset];
 729                         offset += advance;
 730                         goto again;
 731     }
 732
 733 #ifdef TEST_FINALHDR
 734   proto_tree_add_uint_hidden(ipv6_tree, hf_ipv6_final, NullTVB, poffset, 1, nxt);
 735 #endif
 736   if (frag) {
 737     /* fragmented */
 738     if (check_col(fd, COL_PROTOCOL))
 739       col_set_str(fd, COL_PROTOCOL, "IPv6");
 740     /* COL_INFO was filled in by "dissect_frag6()" */
 741     old_dissect_data(pd, offset, fd, tree);
 742   }     else {
 743     /* do lookup with the subdissector table */
 744     if (!old_dissector_try_port(ip_dissector_table, nxt, pd, offset, fd, tree)) {
 745       /* Unknown protocol */
 746       if (check_col(fd, COL_PROTOCOL))
 747         col_set_str(fd, COL_PROTOCOL, "IPv6");
 748       if (check_col(fd, COL_INFO))
 749         col_add_fstr(fd, COL_INFO, "%s (0x%02x)", ipprotostr(nxt),nxt);
 750       old_dissect_data(pd, offset, fd, tree);
 751     }
 752   }
 753 }
 754
 755 static void
 756 dissect_ipv6_none(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
 757   /* BT INSERT BEGIN */
 758   if (hf_ipv6_mipv6_length!=-1) {
 759         if (check_col(fd, COL_PROTOCOL))
 760         col_set_str(fd, COL_PROTOCOL, "IPv6");
 761         if (check_col(fd, COL_INFO))
 762         col_add_fstr(fd, COL_INFO, "MobileIPv6 Destination Option");
 763         } else {
 764   /* BT INSERT END */
 765   if (check_col(fd, COL_INFO))
 766     col_add_fstr(fd, COL_INFO, "IPv6 no next header");
 767   }
 768   /* XXX - dissect the payload as padding? */
 769 }
 770
 771 void
 772 proto_register_ipv6(void)
 773 {
 774   static hf_register_info hf[] = {
 775     { &hf_ipv6_version,
 776       { "Version",              "ipv6.version",
 777                                 FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
 778     { &hf_ipv6_class,
 779       { "Traffic class",        "ipv6.class",
 780                                 FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
 781     { &hf_ipv6_flow,
 782       { "Flowlabel",            "ipv6.flow",
 783                                 FT_UINT32, BASE_HEX, NULL, 0x0, "" }},
 784     { &hf_ipv6_plen,
 785       { "Payload length",       "ipv6.plen",
 786                                 FT_UINT16, BASE_DEC, NULL, 0x0, "" }},
 787     { &hf_ipv6_nxt,
 788       { "Next header",          "ipv6.nxt",
 789                                 FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
 790     { &hf_ipv6_hlim,
 791       { "Hop limit",            "ipv6.hlim",
 792                                 FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
 793     { &hf_ipv6_src,
 794       { "Source",               "ipv6.src",
 795                                 FT_IPv6, BASE_NONE, NULL, 0x0,
 796                                 "Source IPv6 Address" }},
 797     { &hf_ipv6_dst,
 798       { "Destination",          "ipv6.dst",
 799                                 FT_IPv6, BASE_NONE, NULL, 0x0,
 800                                 "Destination IPv6 Address" }},
 801     { &hf_ipv6_addr,
 802       { "Address",              "ipv6.addr",
 803                                 FT_IPv6, BASE_NONE, NULL, 0x0,
 804                                 "Source or Destination IPv6 Address" }},
 805
 806     /* BT INSERT BEGIN */
 807     { &hf_ipv6_mipv6_type,
 808       { "Option Type ",         "ipv6.mipv6_type",
 809                                 FT_UINT8, BASE_DEC, NULL, 0x0,
 810                                 "" }},
 811     { &hf_ipv6_mipv6_length,
 812       { "Option Length ",               "ipv6.mipv6_length",
 813                                 FT_UINT8, BASE_DEC, NULL, 0x0,
 814                                 "" }},
 815     { &hf_ipv6_mipv6_a_flag,
 816       { "Acknowledge (A) ",             "ipv6.mipv6_a_flag",
 817                                 FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_a_flag_value),
 818                                 IP6_MIPv6_BU_A_FLAG,
 819                                 "" }},
 820     { &hf_ipv6_mipv6_h_flag,
 821       { "Home Registration (H) ",               "ipv6.mipv6_h_flag",
 822                                 FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_h_flag_value),
 823                                 IP6_MIPv6_BU_H_FLAG,
 824                                 "" }},
 825     { &hf_ipv6_mipv6_r_flag,
 826       { "Router (R) ",          "ipv6.mipv6_r_flag",
 827                                 FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_r_flag_value),
 828                                 IP6_MIPv6_BU_R_FLAG,
 829                                 "" }},
 830     { &hf_ipv6_mipv6_d_flag,
 831       { "Duplicate Address Detection (D) ",             "ipv6.mipv6_d_flag",
 832                                 FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_d_flag_value),
 833                                 IP6_MIPv6_BU_D_FLAG,
 834                                 "" }},
 835     { &hf_ipv6_mipv6_m_flag,
 836       { "MAP Registration (M) ",                "ipv6.mipv6_m_flag",
 837                                 FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_m_flag_value),
 838                                 IP6_MIPv6_BU_M_FLAG,
 839                                 "" }},
 840     { &hf_ipv6_mipv6_b_flag,
 841       { "Bicasting all (B) ",           "ipv6.mipv6_b_flag",
 842                                 FT_BOOLEAN, 8, TFS(&ipv6_mipv6_bu_b_flag_value),
 843                                 IP6_MIPv6_BU_B_FLAG,
 844                                 "" }},
 845     { &hf_ipv6_mipv6_prefix_length,
 846       { "Prefix Length ",               "ipv6.mipv6_prefix_length",
 847                                 FT_UINT8, BASE_DEC, NULL, 0x0,
 848                                 "" }},
 849     { &hf_ipv6_mipv6_sequence_number,
 850       { "Sequence Number ",             "ipv6.mipv6_sequence_number",
 851                                 FT_UINT16, BASE_DEC, NULL, 0x0,
 852                                 "" }},
 853     { &hf_ipv6_mipv6_life_time,
 854       { "Life Time ",           "ipv6.mipv6_life_time",
 855                                 FT_UINT32, BASE_DEC, NULL, 0x0,
 856                                 "" }},
 857     { &hf_ipv6_mipv6_status,
 858       { "Status ",              "ipv6.mipv6_status",
 859                                 FT_UINT8, BASE_DEC, NULL, 0x0,
 860                                 "" }},
 861     { &hf_ipv6_mipv6_refresh,
 862       { "Refresh ",             "ipv6.mipv6_refresh",
 863                                 FT_UINT32, BASE_DEC, NULL, 0x0,
 864                                 "" }},
 865     { &hf_ipv6_mipv6_home_address,
 866       { "Home Address ",                "ipv6.mipv6_home_address",
 867                                 FT_IPv6, BASE_HEX, NULL, 0x0,
 868                                 "" }},
 869     { &hf_ipv6_mipv6_sub_type,
 870       { "Sub-Option Type ",             "ipv6.mipv6_sub_type",
 871                                 FT_UINT8, BASE_NONE, NULL, 0x0,
 872                                 "" }},
 873     { &hf_ipv6_mipv6_sub_length,
 874       { "Sub-Option Length ",           "ipv6.mipv6_sub_length",
 875                                 FT_UINT8, BASE_NONE, NULL, 0x0,
 876                                 "" }},
 877     { &hf_ipv6_mipv6_sub_unique_ID,
 878       { "Unique Identifier ",           "ipv6.mipv6_sub_unique_ID",
 879                                 FT_UINT16, BASE_NONE, NULL, 0x0,
 880                                 "" }},
 881     { &hf_ipv6_mipv6_sub_alternative_COA,
 882       { "Alternative Care of Address ",         "ipv6.mipv6_sub_alternative_COA",
 883                                 FT_IPv6, BASE_HEX, NULL, 0x0,
 884                                 "" }},
 885
 886     /* BT INSERT END */
 887 #ifdef TEST_FINALHDR
 888     { &hf_ipv6_final,
 889       { "Final next header",    "ipv6.final",
 890                                 FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
 891 #endif
 892   };
 893   static gint *ett[] = {
 894     &ett_ipv6,
 895   };
 896
 897   proto_ipv6 = proto_register_protocol("Internet Protocol Version 6", "IPv6", "ipv6");
 898   proto_register_field_array(proto_ipv6, hf, array_length(hf));
 899   proto_register_subtree_array(ett, array_length(ett));
 900 }
 901
 902 void
 903 proto_reg_handoff_ipv6(void)
 904 {
 905         old_dissector_add("ethertype", ETHERTYPE_IPv6, dissect_ipv6, proto_ipv6);
 906         old_dissector_add("ppp.protocol", PPP_IPV6, dissect_ipv6, proto_ipv6);
 907         old_dissector_add("ip.proto", IP_PROTO_IPV6, dissect_ipv6, proto_ipv6);
 908         old_dissector_add("null.type", BSD_AF_INET6_BSD, dissect_ipv6, proto_ipv6);
 909         old_dissector_add("null.type", BSD_AF_INET6_FREEBSD, dissect_ipv6, proto_ipv6);
 910         old_dissector_add("ip.proto", IP_PROTO_NONE, dissect_ipv6_none, proto_ipv6);
 911 }