epan/dissectors/packet-nhrp.c

   1 /* packet-nhrp.c
   2  * Routines for NBMA Next Hop Resolution Protocol
   3  * RFC 2332 plus Cisco extensions (documented where?)
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  24  *
  25  * CIE decoding for extensions and Cisco 12.4T extensions
  26  * added by Timo Teras <timo.teras@iki.fi>
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <ctype.h>
  37 #include <glib.h>
  38 #include <epan/packet.h>
  39 #include <epan/addr_resolv.h>
  40 #include <epan/expert.h>
  41 #include <epan/etypes.h>
  42 #include <epan/ipproto.h>
  43 #include <epan/greproto.h>
  44 #include <epan/nlpid.h>
  45 #include <epan/oui.h>
  46 #include <epan/sminmpec.h>
  47 #include <epan/afn.h>
  48 #include <epan/in_cksum.h>
  49 #include <epan/iana_snap_pid.h>
  50 #include <epan/dissectors/packet-llc.h>
  51 #include "packet-nhrp.h"
  52
  53 /* forward reference */
  54 void proto_register_nhrp(void);
  55 void proto_reg_handoff_nhrp(void);
  56 void dissect_nhrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
  57
  58 static int proto_nhrp = -1;
  59 static int hf_nhrp_hdr_afn = -1;
  60 static int hf_nhrp_hdr_pro_type = -1;
  61 static int hf_nhrp_hdr_pro_snap_oui = -1;
  62 static int hf_nhrp_hdr_pro_snap_pid = -1;
  63 static int hf_nhrp_hdr_hopcnt = -1;
  64 static int hf_nhrp_hdr_pktsz = -1;
  65 static int hf_nhrp_hdr_chksum = -1;
  66 static int hf_nhrp_hdr_extoff = -1;
  67 static int hf_nhrp_hdr_version = -1;
  68 static int hf_nhrp_hdr_op_type = -1;
  69 static int hf_nhrp_hdr_shtl = -1;
  70 static int hf_nhrp_hdr_shtl_type = -1;
  71 static int hf_nhrp_hdr_shtl_len = -1;
  72 static int hf_nhrp_hdr_sstl = -1;
  73 static int hf_nhrp_hdr_sstl_type = -1;
  74 static int hf_nhrp_hdr_sstl_len = -1;
  75
  76 static int hf_nhrp_src_proto_len = -1;
  77 static int hf_nhrp_dst_proto_len = -1;
  78 static int hf_nhrp_flags = -1;
  79 static int hf_nhrp_flag_Q = -1;
  80 static int hf_nhrp_flag_N = -1;
  81 static int hf_nhrp_flag_A = -1;
  82 static int hf_nhrp_flag_D = -1;
  83 static int hf_nhrp_flag_U1 = -1;
  84 static int hf_nhrp_flag_U2 = -1;
  85 static int hf_nhrp_flag_S = -1;
  86 static int hf_nhrp_flag_NAT = -1;
  87 static int hf_nhrp_src_nbma_addr = -1;
  88 static int hf_nhrp_src_nbma_saddr = -1;
  89 static int hf_nhrp_src_prot_addr = -1;
  90 static int hf_nhrp_dst_prot_addr = -1;
  91 static int hf_nhrp_request_id = -1;
  92
  93 static int hf_nhrp_code = -1;
  94 static int hf_nhrp_prefix_len = -1;
  95 static int hf_nhrp_unused = -1;
  96 static int hf_nhrp_mtu = -1;
  97 static int hf_nhrp_holding_time = -1;
  98 static int hf_nhrp_cli_addr_tl = -1;
  99 static int hf_nhrp_cli_addr_tl_type = -1;
 100 static int hf_nhrp_cli_addr_tl_len = -1;
 101 static int hf_nhrp_cli_saddr_tl = -1;
 102 static int hf_nhrp_cli_saddr_tl_type = -1;
 103 static int hf_nhrp_cli_saddr_tl_len = -1;
 104 static int hf_nhrp_cli_prot_len = -1;
 105 static int hf_nhrp_pref = -1;
 106 static int hf_nhrp_client_nbma_addr = -1;
 107 static int hf_nhrp_client_nbma_saddr = -1;
 108 static int hf_nhrp_client_prot_addr = -1;
 109 static int hf_nhrp_ext_C = -1;
 110 static int hf_nhrp_ext_type = -1;
 111 static int hf_nhrp_ext_len = -1;
 112 static int hf_nhrp_ext_value = -1;
 113 static int hf_nhrp_error_offset = -1;
 114 static int hf_nhrp_error_packet = -1;
 115
 116 static gint ett_nhrp = -1;
 117 static gint ett_nhrp_hdr = -1;
 118 static gint ett_nhrp_hdr_shtl = -1;
 119 static gint ett_nhrp_hdr_sstl = -1;
 120 static gint ett_nhrp_mand = -1;
 121 static gint ett_nhrp_ext = -1;
 122 static gint ett_nhrp_mand_flag = -1;
 123 static gint ett_nhrp_cie = -1;
 124 static gint ett_nhrp_cie_cli_addr_tl = -1;
 125 static gint ett_nhrp_cie_cli_saddr_tl = -1;
 126 static gint ett_nhrp_indication = -1;
 127
 128 /* NHRP Packet Types */
 129 #define NHRP_RESOLUTION_REQ             1
 130 #define NHRP_RESOLUTION_REPLY   2
 131 #define NHRP_REGISTRATION_REQ   3
 132 #define NHRP_REGISTRATION_REPLY 4
 133 #define NHRP_PURGE_REQ                  5
 134 #define NHRP_PURGE_REPLY                6
 135 #define NHRP_ERROR_INDICATION   7
 136 #define NHRP_TRAFFIC_INDICATION 8
 137
 138 /* NHRP Extension Types */
 139 #define NHRP_EXT_NULL                   0       /* End of Extension */
 140 #define NHRP_EXT_RESP_ADDR              3       /* Responder Address Extension */
 141 #define NHRP_EXT_FWD_RECORD             4       /* NHRP Forward Transit NHS Record Extension */
 142 #define NHRP_EXT_REV_RECORD             5       /* NHRP Reverse Transit NHS Record Extension */
 143 #define NHRP_EXT_AUTH                   7       /* NHRP Authentication Extension */
 144 #define NHRP_EXT_VENDOR_PRIV    8       /* NHRP Vendor Private Extension */
 145 #define NHRP_EXT_NAT_ADDRESS    9       /* Cisco NAT Address Extension */
 146
 147 /* NHRP Error Codes */
 148 #define NHRP_ERR_UNRECOGNIZED_EXT               0x0001
 149 #define NHRP_ERR_NHRP_LOOP_DETECT               0x0003
 150 #define NHRP_ERR_PROT_ADDR_UNREACHABLE  0x0006
 151 #define NHRP_ERR_PROT_ERROR                             0x0007
 152 #define NHRP_ERR_SDU_SIZE_EXCEEDED              0x0008
 153 #define NHRP_ERR_INV_EXT                                0x0009
 154 #define NHRP_ERR_INV_RESOLUTION_REPLY   0x000a
 155 #define NHRP_ERR_AUTH_FAILURE                   0x000b
 156 #define NHRP_ERR_HOP_COUNT_EXCEEDED             0x000f
 157
 158 /* NHRP CIE codes */
 159 #define NHRP_CODE_SUCCESS                                       0x00
 160 #define NHRP_CODE_ADMIN_PROHIBITED              0x04
 161 #define NHRP_CODE_INSUFFICIENT_RESOURCES        0x05
 162 #define NHRP_CODE_NO_BINDING_EXISTS             0x0c
 163 #define NHRP_CODE_NON_UNIQUE_BINDING            0x0d
 164 #define NHRP_CODE_ALREADY_REGISTERED            0x0e
 165
 166 /* NHRP Subnetwork layer address type/length */
 167 #define NHRP_SHTL_TYPE_MASK     0x40
 168 #define NHRP_SHTL_LEN_MASK      0x3F
 169 #define NHRP_SHTL_TYPE(val)     (((val) & (NHRP_SHTL_TYPE_MASK)) >> 6)
 170 #define NHRP_SHTL_LEN(val)      ((val) & (NHRP_SHTL_LEN_MASK))
 171
 172 #define NHRP_SHTL_TYPE_NSAP     0
 173 #define NHRP_SHTL_TYPE_E164     1
 174
 175 static const value_string nhrp_shtl_type_vals[] = {
 176         { NHRP_SHTL_TYPE_NSAP, "NSAP format" },
 177         { NHRP_SHTL_TYPE_E164, "Native E.164 format" },
 178         { 0, NULL }
 179 };
 180
 181 static const value_string nhrp_op_type_vals[] = {
 182         { NHRP_RESOLUTION_REQ,          "NHRP Resolution Request" },
 183         { NHRP_RESOLUTION_REPLY,        "NHRP Resolution Reply" },
 184         { NHRP_REGISTRATION_REQ,        "NHRP Registration Request" },
 185         { NHRP_REGISTRATION_REPLY,      "NHRP Registration Reply" },
 186         { NHRP_PURGE_REQ,                       "NHRP Purge Request" },
 187         { NHRP_PURGE_REPLY,             "NHRP Purge Reply" },
 188         { NHRP_ERROR_INDICATION,        "NHRP Error Indication" },
 189         { NHRP_TRAFFIC_INDICATION,      "NHRP Traffic Indication" },
 190         { 0,                                            NULL }
 191 };
 192
 193 static const value_string ext_type_vals[] = {
 194         { NHRP_EXT_NULL,                        "End of Extension" },
 195         { NHRP_EXT_RESP_ADDR,           "Responder Address Extension" },
 196         { NHRP_EXT_FWD_RECORD,          "Forward Transit NHS Record Extension" },
 197         { NHRP_EXT_REV_RECORD,          "Reverse Transit NHS Record Extension" },
 198         { NHRP_EXT_AUTH,                        "NHRP Authentication Extension" },
 199         { NHRP_EXT_VENDOR_PRIV,         "NHRP Vendor Private Extension" },
 200         { NHRP_EXT_NAT_ADDRESS,         "Cisco NAT Address Extension" },
 201         { 0,                                            NULL }
 202 };
 203
 204 static const value_string nhrp_error_code_vals[] = {
 205         { NHRP_ERR_UNRECOGNIZED_EXT,            "Unrecognized Extension" },
 206         { NHRP_ERR_NHRP_LOOP_DETECT,            "NHRP Loop Detected" },
 207         { NHRP_ERR_PROT_ADDR_UNREACHABLE,       "Protocol Address Unreachable" },
 208         { NHRP_ERR_PROT_ERROR,                          "Protocol Error" },
 209         { NHRP_ERR_SDU_SIZE_EXCEEDED,           "NHRP SDU Size Exceeded" },
 210         { NHRP_ERR_INV_EXT,                             "Invalid Extension" },
 211         { NHRP_ERR_INV_RESOLUTION_REPLY,        "Invalid NHRP Resolution Reply Received" },
 212         { NHRP_ERR_AUTH_FAILURE,                        "Authentication Failure" },
 213         { NHRP_ERR_HOP_COUNT_EXCEEDED,          "Hop Count Exceeded" },
 214         { 0,                                                            NULL }
 215 };
 216
 217 static const value_string nhrp_cie_code_vals[] = {
 218         { NHRP_CODE_SUCCESS,                            "Success" },
 219         { NHRP_CODE_ADMIN_PROHIBITED,           "Administratively Prohibited" },
 220         { NHRP_CODE_INSUFFICIENT_RESOURCES, "Insufficient Resources" },
 221         { NHRP_CODE_NO_BINDING_EXISTS,          "No Interworking Layer Address to NBMA Address Binding Exists" },
 222         { NHRP_CODE_NON_UNIQUE_BINDING,         "Binding Exists But Is Not Unique" },
 223         { NHRP_CODE_ALREADY_REGISTERED,         "Unique Internetworking Layer Address Already Registered" },
 224         { 0,                                                            NULL }
 225 };
 226
 227 static dissector_table_t osinl_subdissector_table;
 228 static dissector_table_t osinl_excl_subdissector_table;
 229 static dissector_table_t ethertype_subdissector_table;
 230
 231 static dissector_handle_t data_handle;
 232
 233 typedef struct _e_nhrp {
 234         guint16 ar_afn;
 235         guint16 ar_pro_type;
 236         guint32 ar_pro_type_oui;
 237         guint16 ar_pro_type_pid;
 238         guint8  ar_hopCnt;
 239         guint16 ar_pktsz;
 240         guint16 ar_chksum;
 241         guint16 ar_extoff;
 242         guint8  ar_op_version;
 243         guint8  ar_op_type;
 244         guint8  ar_shtl;
 245         guint8  ar_sstl;
 246 } e_nhrp_hdr;
 247
 248 static guint16 nhrp_checksum(const guint8 *ptr, int len)
 249 {
 250         vec_t cksum_vec[1];
 251
 252         cksum_vec[0].ptr = ptr;
 253         cksum_vec[0].len = len;
 254         return in_cksum(&cksum_vec[0], 1);
 255 }
 256
 257 void dissect_nhrp_hdr(tvbuff_t *tvb,
 258                                           packet_info *pinfo,
 259                                           proto_tree *tree,
 260                                           gint *pOffset,
 261                                           gint *pMandLen,
 262                                           gint *pExtLen,
 263                                           oui_info_t **pOuiInfo,
 264                                           e_nhrp_hdr *hdr)
 265 {
 266         gint    offset = *pOffset;
 267         const gchar *pro_type_str;
 268         guint   total_len = tvb_reported_length(tvb);
 269         guint16 ipcsum, rx_chksum;
 270
 271         proto_item *nhrp_tree_item = NULL;
 272         proto_tree *nhrp_tree = NULL;
 273         proto_item *shtl_tree_item = NULL;
 274         proto_tree *shtl_tree = NULL;
 275         proto_item *sstl_tree_item = NULL;
 276         proto_tree *sstl_tree = NULL;
 277         proto_item *ti;
 278
 279         nhrp_tree_item = proto_tree_add_text(tree, tvb, offset, 20, "NHRP Fixed Header");
 280         nhrp_tree = proto_item_add_subtree(nhrp_tree_item, ett_nhrp_hdr);
 281
 282         hdr->ar_pktsz = tvb_get_ntohs(tvb, 10);
 283         if (total_len > hdr->ar_pktsz) {
 284                 total_len = hdr->ar_pktsz;
 285         }
 286
 287         hdr->ar_afn = tvb_get_ntohs(tvb, offset);
 288         proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_afn, tvb, offset, 2, FALSE);
 289         offset += 2;
 290
 291         hdr->ar_pro_type = tvb_get_ntohs(tvb, offset);
 292         if (hdr->ar_pro_type <= 0xFF) {
 293                 /* It's an NLPID */
 294                 pro_type_str = val_to_str(hdr->ar_pro_type, nlpid_vals,
 295                     "Unknown NLPID");
 296         } else if (hdr->ar_pro_type <= 0x3FF) {
 297                 /* Reserved for future use by the IETF */
 298                 pro_type_str = "Reserved for future use by the IETF";
 299         } else if (hdr->ar_pro_type <= 0x04FF) {
 300                 /* Allocated for use by the ATM Forum */
 301                 pro_type_str = "Allocated for use by the ATM Forum";
 302         } else if (hdr->ar_pro_type <= 0x05FF) {
 303                 /* Experimental/Local use */
 304                 pro_type_str = "Experimental/Local use";
 305         } else {
 306                 pro_type_str = val_to_str(hdr->ar_pro_type, etype_vals,
 307                     "Unknown Ethertype");
 308         }
 309         proto_tree_add_uint_format(nhrp_tree, hf_nhrp_hdr_pro_type, tvb, offset, 2,
 310             hdr->ar_pro_type, "Protocol Type (short form): %s (0x%04x)",
 311             pro_type_str, hdr->ar_pro_type);
 312         offset += 2;
 313
 314         if (hdr->ar_pro_type == NLPID_SNAP) {
 315                 /*
 316                  * The long form protocol type is a SNAP OUI and PID.
 317                  */
 318                 hdr->ar_pro_type_oui = tvb_get_ntoh24(tvb, offset);
 319                 proto_tree_add_uint(nhrp_tree, hf_nhrp_hdr_pro_snap_oui,
 320                     tvb, offset, 3, hdr->ar_pro_type_oui);
 321                 offset += 3;
 322
 323                 hdr->ar_pro_type_pid = tvb_get_ntohs(tvb, offset);
 324                 *pOuiInfo = get_snap_oui_info(hdr->ar_pro_type_oui);
 325                 if (*pOuiInfo != NULL) {
 326                         proto_tree_add_uint(nhrp_tree,
 327                             *(*pOuiInfo)->field_info->p_id,
 328                             tvb, offset, 2, hdr->ar_pro_type_pid);
 329                 } else {
 330                         proto_tree_add_uint(nhrp_tree, hf_nhrp_hdr_pro_snap_pid,
 331                             tvb, offset, 2, hdr->ar_pro_type_pid);
 332                 }
 333         } else {
 334                 /*
 335                  * XXX - we should check that this is zero, as RFC 2332
 336                  * says it should be zero.
 337                  */
 338                 proto_tree_add_text(nhrp_tree, tvb, offset, 5,
 339                                                 "Protocol Type (long form): %s",
 340                                                 tvb_bytes_to_str(tvb, offset, 5));
 341                 offset += 5;
 342         }
 343
 344         proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_hopcnt, tvb, offset, 1, FALSE);
 345         offset += 1;
 346
 347         proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_pktsz, tvb, offset, 2, FALSE);
 348         offset += 2;
 349
 350         rx_chksum = tvb_get_ntohs(tvb, offset);
 351         if (tvb_bytes_exist(tvb, 0, total_len)) {
 352                 ipcsum = nhrp_checksum(tvb_get_ptr(tvb, 0, total_len),
 353                     total_len);
 354                 if (ipcsum == 0) {
 355                         proto_tree_add_uint_format(nhrp_tree, hf_nhrp_hdr_chksum, tvb, offset, 2, rx_chksum,
 356                             "NHRP Packet checksum: 0x%04x [correct]", rx_chksum);
 357                 } else {
 358                         proto_tree_add_uint_format(nhrp_tree, hf_nhrp_hdr_chksum, tvb, offset, 2, rx_chksum,
 359                             "NHRP Packet checksum: 0x%04x [incorrect, should be 0x%04x]", rx_chksum,
 360                             in_cksum_shouldbe(rx_chksum, ipcsum));
 361                 }
 362         } else {
 363                 proto_tree_add_uint_format(nhrp_tree, hf_nhrp_hdr_chksum, tvb, offset, 2, rx_chksum,
 364                     "NHRP Packet checksum: 0x%04x [not all data available]", rx_chksum);
 365         }
 366         offset += 2;
 367
 368         hdr->ar_extoff = tvb_get_ntohs(tvb, offset);
 369         ti = proto_tree_add_item(nhrp_tree, hf_nhrp_hdr_extoff, tvb, offset, 2, FALSE);
 370         if (hdr->ar_extoff != 0 && hdr->ar_extoff < 20) {
 371                 expert_add_info_format(pinfo, ti, PI_MALFORMED, PI_ERROR,
 372                     "Extension offset is less than the fixed header length");
 373         }
 374         offset += 2;
 375
 376         hdr->ar_op_version = tvb_get_guint8(tvb, offset);
 377         proto_tree_add_text(nhrp_tree, tvb, offset, 1, "Version : %u (%s)",
 378                                                 hdr->ar_op_version,
 379                                                 (hdr->ar_op_version == 1) ? "NHRP - rfc2332" : "Unknown");
 380         offset += 1;
 381
 382         proto_tree_add_text(nhrp_tree, tvb, offset, 1, "NHRP Packet Type : (%s)",
 383                                                 val_to_str(hdr->ar_op_type, nhrp_op_type_vals, "Unknown (%u)")) ;
 384         offset += 1;
 385
 386         hdr->ar_shtl = tvb_get_guint8(tvb, offset);
 387         shtl_tree_item = proto_tree_add_uint_format(nhrp_tree, hf_nhrp_hdr_shtl,
 388                 tvb, offset, 1, hdr->ar_shtl, "Source Address Type/Len: %s/%u",
 389                 val_to_str(NHRP_SHTL_TYPE(hdr->ar_shtl), nhrp_shtl_type_vals, "Unknown Type"),
 390                 NHRP_SHTL_LEN(hdr->ar_shtl));
 391         shtl_tree = proto_item_add_subtree(shtl_tree_item, ett_nhrp_hdr_shtl);
 392         proto_tree_add_item(shtl_tree, hf_nhrp_hdr_shtl_type, tvb, offset, 1, FALSE);
 393         proto_tree_add_item(shtl_tree, hf_nhrp_hdr_shtl_len, tvb, offset, 1, FALSE);
 394         offset += 1;
 395
 396         hdr->ar_sstl = tvb_get_guint8(tvb, offset);
 397         sstl_tree_item = proto_tree_add_uint_format(nhrp_tree, hf_nhrp_hdr_sstl,
 398                 tvb, offset, 1, hdr->ar_sstl, "Source SubAddress Type/Len: %s/%u",
 399                 val_to_str(NHRP_SHTL_TYPE(hdr->ar_sstl), nhrp_shtl_type_vals, "Unknown Type"),
 400                 NHRP_SHTL_LEN(hdr->ar_sstl));
 401         sstl_tree = proto_item_add_subtree(sstl_tree_item, ett_nhrp_hdr_sstl);
 402         proto_tree_add_item(sstl_tree, hf_nhrp_hdr_sstl_type, tvb, offset, 1, FALSE);
 403         proto_tree_add_item(sstl_tree, hf_nhrp_hdr_sstl_len, tvb, offset, 1, FALSE);
 404         offset += 1;
 405
 406         *pOffset = offset;
 407         if (hdr->ar_extoff != 0) {
 408                 if (hdr->ar_extoff >= 20) {
 409                         *pMandLen = hdr->ar_extoff - 20;
 410                         *pExtLen = total_len - hdr->ar_extoff;
 411                 } else {
 412                         /* Error */
 413                         *pMandLen = 0;
 414                         *pExtLen = 0;
 415                 }
 416         }
 417         else {
 418                 if (total_len >= 20)
 419                         *pMandLen = total_len - 20;
 420                 else {
 421                         /* "Can't happen" - we would have thrown an exception */
 422                         *pMandLen = 0;
 423                 }
 424                 *pExtLen = 0;
 425         }
 426 }
 427
 428 void dissect_cie_list(tvbuff_t *tvb,
 429                                           proto_tree *tree,
 430                                           gint offset,
 431                                           gint cieEnd,
 432                                           e_nhrp_hdr *hdr,
 433                                           gint isReq)
 434 {
 435         proto_item *cli_addr_tree_item = NULL;
 436         proto_tree *cli_addr_tree = NULL;
 437         proto_item *cli_saddr_tree_item = NULL;
 438         proto_tree *cli_saddr_tree = NULL;
 439         guint8 val;
 440
 441         while ((offset + 12) <= cieEnd) {
 442                 guint cli_addr_len = tvb_get_guint8(tvb, offset + 8);
 443                 guint cli_saddr_len = tvb_get_guint8(tvb, offset + 9);
 444                 guint cli_prot_len = tvb_get_guint8(tvb, offset + 10);
 445                 guint cie_len = 12 + cli_addr_len + cli_saddr_len + cli_prot_len;
 446                 proto_item *cie_tree_item = proto_tree_add_text(tree, tvb, offset, cie_len, "Client Information Entry");
 447                 proto_tree *cie_tree = proto_item_add_subtree(cie_tree_item, ett_nhrp_cie);
 448
 449                 if (isReq) {
 450                         proto_tree_add_item(cie_tree, hf_nhrp_code, tvb, offset, 1, FALSE);
 451                 }
 452                 else {
 453                         guint8 code = tvb_get_guint8(tvb, offset);
 454                         proto_tree_add_text(cie_tree, tvb, offset, 1, "Code: %s",
 455                                                                 val_to_str(code, nhrp_cie_code_vals, "Unknown (%u)"));
 456                 }
 457                 offset += 1;
 458
 459                 proto_tree_add_item(cie_tree, hf_nhrp_prefix_len, tvb, offset, 1, FALSE);
 460                 offset += 1;
 461
 462                 proto_tree_add_item(cie_tree, hf_nhrp_unused, tvb, offset, 2, FALSE);
 463                 offset += 2;
 464
 465                 proto_tree_add_item(cie_tree, hf_nhrp_mtu, tvb, offset, 2, FALSE);
 466                 offset += 2;
 467
 468                 proto_tree_add_item(cie_tree, hf_nhrp_holding_time, tvb, offset, 2, FALSE);
 469                 offset += 2;
 470
 471                 val = tvb_get_guint8(tvb, offset);
 472                 cli_addr_tree_item = proto_tree_add_uint_format(cie_tree,
 473                         hf_nhrp_cli_addr_tl, tvb, offset, 1, val,
 474                         "Client Address Type/Len: %s/%u",
 475                         val_to_str(NHRP_SHTL_TYPE(val), nhrp_shtl_type_vals, "Unknown Type"),
 476                         NHRP_SHTL_LEN(val));
 477                 cli_addr_tree = proto_item_add_subtree(cli_addr_tree_item, ett_nhrp_cie_cli_addr_tl);
 478                 proto_tree_add_item(cli_addr_tree, hf_nhrp_cli_addr_tl_type, tvb, offset, 1, FALSE);
 479                 proto_tree_add_item(cli_addr_tree, hf_nhrp_cli_addr_tl_len, tvb, offset, 1, FALSE);
 480                 offset += 1;
 481
 482                 val = tvb_get_guint8(tvb, offset);
 483                 cli_saddr_tree_item = proto_tree_add_uint_format(cie_tree,
 484                         hf_nhrp_cli_saddr_tl, tvb, offset, 1, val,
 485                         "Client Sub Address Type/Len: %s/%u",
 486                         val_to_str(NHRP_SHTL_TYPE(val), nhrp_shtl_type_vals, "Unknown Type"),
 487                         NHRP_SHTL_LEN(val));
 488                 cli_saddr_tree = proto_item_add_subtree(cli_saddr_tree_item, ett_nhrp_cie_cli_saddr_tl);
 489                 proto_tree_add_item(cli_saddr_tree, hf_nhrp_cli_saddr_tl_type, tvb, offset, 1, FALSE);
 490                 proto_tree_add_item(cli_saddr_tree, hf_nhrp_cli_saddr_tl_len, tvb, offset, 1, FALSE);
 491                 offset += 1;
 492
 493                 proto_tree_add_item(cie_tree, hf_nhrp_cli_prot_len, tvb, offset, 1, FALSE);
 494                 offset += 1;
 495
 496                 proto_tree_add_item(cie_tree, hf_nhrp_pref, tvb, offset, 1, FALSE);
 497                 offset += 1;
 498
 499                 if (cli_addr_len) {
 500                         switch (hdr->ar_afn) {
 501
 502                         case AFNUM_INET:
 503                                 if (cli_addr_len == 4)
 504                                         proto_tree_add_item(cie_tree, hf_nhrp_client_nbma_addr, tvb, offset, 4, FALSE);
 505                                 else {
 506                                         proto_tree_add_text(cie_tree, tvb, offset, cli_addr_len,
 507                                             "Client NBMA Address: %s",
 508                                             tvb_bytes_to_str(tvb, offset, cli_addr_len));
 509                                 }
 510                                 break;
 511
 512                         default:
 513                                 proto_tree_add_text(cie_tree, tvb, offset, cli_addr_len,
 514                                     "Client NBMA Address: %s",
 515                                     tvb_bytes_to_str(tvb, offset, cli_addr_len));
 516                                 break;
 517                         }
 518                         offset += cli_addr_len;
 519                 }
 520
 521                 if (cli_saddr_len) {
 522                         proto_tree_add_text(cie_tree, tvb, offset, cli_saddr_len,
 523                                                                 "Client NBMA Sub Address: %s",
 524                                                                 tvb_bytes_to_str(tvb, offset, cli_saddr_len));
 525                 }
 526
 527                 if (cli_prot_len) {
 528                         if (cli_prot_len == 4)
 529                                 proto_tree_add_ipv4(cie_tree, hf_nhrp_client_prot_addr, tvb, offset, 4, FALSE);
 530                         else {
 531                                 proto_tree_add_text(cie_tree, tvb, offset, cli_prot_len,
 532                                                                         "Client Protocol Address: %s",
 533                                                                         tvb_bytes_to_str(tvb, offset, cli_prot_len));
 534                         }
 535                         offset += cli_prot_len;
 536                 }
 537         }
 538 }
 539
 540 void dissect_nhrp_mand(tvbuff_t *tvb,
 541                                            packet_info *pinfo,
 542                                            proto_tree *tree,
 543                                            gint *pOffset,
 544                                            gint mandLen,
 545                                            oui_info_t *oui_info,
 546                                            e_nhrp_hdr *hdr)
 547 {
 548         gint    offset = *pOffset;
 549         gint    mandEnd = offset + mandLen;
 550         guint8  ssl, shl;
 551         guint16 flags;
 552         guint   srcLen, dstLen;
 553         gboolean isReq = 0;
 554         gboolean isErr = 0;
 555         gboolean isInd = 0;
 556
 557         proto_item *nhrp_tree_item = NULL;
 558         proto_item *flag_item = NULL;
 559         proto_tree *nhrp_tree = NULL;
 560         proto_tree *flag_tree = NULL;
 561
 562         tvb_ensure_bytes_exist(tvb, offset, mandLen);
 563
 564         switch (hdr->ar_op_type)
 565         {
 566         case NHRP_RESOLUTION_REQ:
 567         case NHRP_REGISTRATION_REQ:
 568         case NHRP_PURGE_REQ:
 569                 isReq = 1;
 570                 break;
 571         case NHRP_ERROR_INDICATION:     /* This needs special treatment */
 572                 isErr = 1;
 573                 isInd = 1;
 574                 break;
 575         case NHRP_TRAFFIC_INDICATION:
 576                 isInd = 1;
 577                 break;
 578         }
 579         nhrp_tree_item = proto_tree_add_text(tree, tvb, offset, mandLen, "NHRP Mandatory Part");
 580         nhrp_tree = proto_item_add_subtree(nhrp_tree_item, ett_nhrp_mand);
 581
 582         srcLen = tvb_get_guint8(tvb, offset);
 583         proto_tree_add_item(nhrp_tree, hf_nhrp_src_proto_len, tvb, offset, 1, FALSE);
 584         offset += 1;
 585
 586         dstLen = tvb_get_guint8(tvb, offset);
 587         proto_tree_add_item(nhrp_tree, hf_nhrp_dst_proto_len, tvb, offset, 1, FALSE);
 588         offset += 1;
 589
 590         if (!isInd) {
 591                 flags = tvb_get_ntohs(tvb, offset);
 592                 flag_item = proto_tree_add_uint(nhrp_tree, hf_nhrp_flags, tvb, offset, 2, flags);
 593                 flag_tree = proto_item_add_subtree(flag_item, ett_nhrp_mand_flag);
 594
 595                 switch (hdr->ar_op_type)
 596                 {
 597                 case NHRP_RESOLUTION_REQ:
 598                 case NHRP_RESOLUTION_REPLY:
 599                         proto_tree_add_boolean(flag_tree, hf_nhrp_flag_Q, tvb, offset, 2, flags);
 600                         proto_tree_add_boolean(flag_tree, hf_nhrp_flag_A, tvb, offset, 2, flags);
 601                         proto_tree_add_boolean(flag_tree, hf_nhrp_flag_D, tvb, offset, 2, flags);
 602                         proto_tree_add_boolean(flag_tree, hf_nhrp_flag_U1, tvb, offset, 2, flags);
 603                         proto_tree_add_boolean(flag_tree, hf_nhrp_flag_S, tvb, offset, 2, flags);
 604                         break;
 605                 case NHRP_REGISTRATION_REQ:
 606                 case NHRP_REGISTRATION_REPLY:
 607                         proto_tree_add_boolean(flag_tree, hf_nhrp_flag_U2, tvb, offset, 2, flags);
 608                         break;
 609
 610                 case NHRP_PURGE_REQ:
 611                 case NHRP_PURGE_REPLY:
 612                         proto_tree_add_boolean(flag_tree, hf_nhrp_flag_N, tvb, offset, 2, flags);
 613                         break;
 614                 }
 615                 proto_tree_add_boolean(flag_tree, hf_nhrp_flag_NAT, tvb, offset, 2, flags);
 616
 617                 offset += 2;
 618
 619                 proto_tree_add_item(nhrp_tree, hf_nhrp_request_id, tvb, offset, 4, FALSE);
 620                 offset += 4;
 621         }
 622         else if (isErr) {
 623                 guint16 err_code;
 624                 offset += 2;
 625
 626                 err_code = tvb_get_ntohs(tvb, offset);
 627                 proto_tree_add_text(tree, tvb, offset, 2, "Error Code: %s",
 628                                                         val_to_str(err_code, nhrp_error_code_vals, "Unknown (%u)"));
 629                 offset += 2;
 630
 631                 proto_tree_add_item(nhrp_tree, hf_nhrp_error_offset, tvb, offset, 2, FALSE);
 632                 offset += 2;
 633         }
 634         else {
 635                 offset += 6;
 636         }
 637
 638         shl = NHRP_SHTL_LEN(hdr->ar_shtl);
 639         if (shl) {
 640                 switch (hdr->ar_afn) {
 641
 642                 case AFNUM_INET:
 643                         if (shl == 4)
 644                                 proto_tree_add_item(nhrp_tree, hf_nhrp_src_nbma_addr, tvb, offset, 4, FALSE);
 645                         else {
 646                                 proto_tree_add_text(nhrp_tree, tvb, offset, shl,
 647                                     "Source NBMA Address: %s",
 648                                     tvb_bytes_to_str(tvb, offset, shl));
 649                         }
 650                         break;
 651
 652                 default:
 653                         proto_tree_add_text(nhrp_tree, tvb, offset, shl,
 654                             "Source NBMA Address: %s",
 655                             tvb_bytes_to_str(tvb, offset, shl));
 656                         break;
 657                 }
 658                 offset += shl;
 659         }
 660
 661         ssl = NHRP_SHTL_LEN(hdr->ar_sstl);
 662         if (ssl) {
 663                 proto_tree_add_text(nhrp_tree, tvb, offset, ssl,
 664                                                         "Source NBMA Sub Address: %s",
 665                                                         tvb_bytes_to_str(tvb, offset, ssl));
 666                 offset += ssl;
 667         }
 668
 669         if (srcLen) {
 670                 if (srcLen == 4)
 671                         proto_tree_add_item(nhrp_tree, hf_nhrp_src_prot_addr, tvb, offset, 4, FALSE);
 672                 else {
 673                         proto_tree_add_text(nhrp_tree, tvb, offset, srcLen,
 674                                                                 "Source Protocol Address: %s",
 675                                                                 tvb_bytes_to_str(tvb, offset, srcLen));
 676                 }
 677                 offset += srcLen;
 678         }
 679
 680         if (dstLen) {
 681                 if (dstLen == 4)
 682                         proto_tree_add_item(nhrp_tree, hf_nhrp_dst_prot_addr, tvb, offset, 4, FALSE);
 683                 else {
 684                         proto_tree_add_text(nhrp_tree, tvb, offset, dstLen,
 685                                                                 "Destination Protocol Address: %s",
 686                                                                 tvb_bytes_to_str(tvb, offset, dstLen));
 687                 }
 688                 offset += dstLen;
 689         }
 690
 691         if (isInd) {
 692                 gboolean save_in_error_pkt;
 693                 gint pkt_len = mandEnd - offset;
 694                 proto_item *ind_tree_item = proto_tree_add_text(tree, tvb, offset, pkt_len, "Packet Causing Indication");
 695                 proto_tree *ind_tree = proto_item_add_subtree(ind_tree_item, ett_nhrp_indication);
 696                 gboolean dissected;
 697                 tvbuff_t *sub_tvb;
 698
 699                 save_in_error_pkt = pinfo->in_error_pkt;
 700                 pinfo->in_error_pkt = TRUE;
 701                 sub_tvb = tvb_new_subset(tvb, offset, -1, -1);
 702                 if (isErr) {
 703                         dissect_nhrp(sub_tvb, pinfo, ind_tree);
 704                 }
 705                 else {
 706                         if (hdr->ar_pro_type <= 0xFF) {
 707                                 /* It's an NLPID */
 708                                 if (hdr->ar_pro_type == NLPID_SNAP) {
 709                                         /*
 710                                          * Dissect based on the SNAP OUI
 711                                          * and PID.
 712                                          */
 713                                         if (hdr->ar_pro_type_oui == 0x000000) {
 714                                                 /*
 715                                                  * "Should not happen", as
 716                                                  * the protocol type should
 717                                                  * be the Ethertype, but....
 718                                                  */
 719                                                 dissected = dissector_try_port(
 720                                                     ethertype_subdissector_table,
 721                                                     hdr->ar_pro_type_pid,
 722                                                     sub_tvb, pinfo, ind_tree);
 723                                         } else {
 724                                                 /*
 725                                                  * If we have a dissector
 726                                                  * table, use it, otherwise
 727                                                  * just dissect as data.
 728                                                  */
 729                                                 if (oui_info != NULL) {
 730                                                         dissected = dissector_try_port(
 731                                                             oui_info->table,
 732                                                             hdr->ar_pro_type_pid,
 733                                                             sub_tvb, pinfo,
 734                                                             ind_tree);
 735                                                 } else
 736                                                         dissected = FALSE;
 737                                         }
 738                                 } else {
 739                                         /*
 740                                          * Dissect based on the NLPID.
 741                                          */
 742                                         dissected = dissector_try_port(
 743                                             osinl_subdissector_table,
 744                                             hdr->ar_pro_type, sub_tvb, pinfo,
 745                                             ind_tree) ||
 746                                                     dissector_try_port(
 747                                             osinl_excl_subdissector_table,
 748                                             hdr->ar_pro_type, sub_tvb, pinfo,
 749                                             ind_tree);
 750                                 }
 751                         } else if (hdr->ar_pro_type <= 0x3FF) {
 752                                 /* Reserved for future use by the IETF */
 753                                 dissected = FALSE;
 754                         } else if (hdr->ar_pro_type <= 0x04FF) {
 755                                 /* Allocated for use by the ATM Forum */
 756                                 dissected = FALSE;
 757                         } else if (hdr->ar_pro_type <= 0x05FF) {
 758                                 /* Experimental/Local use */
 759                                 dissected = FALSE;
 760                         } else {
 761                                 dissected = dissector_try_port(
 762                                     ethertype_subdissector_table,
 763                                     hdr->ar_pro_type, sub_tvb, pinfo, ind_tree);
 764                         }
 765                         if (!dissected) {
 766                                 call_dissector(data_handle, sub_tvb, pinfo,
 767                                     ind_tree);
 768                         }
 769                 }
 770                 pinfo->in_error_pkt = save_in_error_pkt;
 771                 offset = mandEnd;
 772         }
 773
 774         dissect_cie_list(tvb, nhrp_tree, offset, mandEnd, hdr, isReq);
 775
 776         *pOffset = mandEnd;
 777 }
 778
 779 /* TBD : Decode Authentication Extension and Vendor Specific Extension */
 780 void dissect_nhrp_ext(tvbuff_t *tvb,
 781                                           proto_tree *tree,
 782                                           gint *pOffset,
 783                                           gint extLen,
 784                                           e_nhrp_hdr *hdr)
 785 {
 786         gint    offset = *pOffset;
 787         gint    extEnd = offset + extLen;
 788
 789         proto_item *nhrp_tree_item = NULL;
 790         proto_tree *nhrp_tree = NULL;
 791
 792         tvb_ensure_bytes_exist(tvb, offset, extLen);
 793
 794         while ((offset + 4) <= extEnd)
 795         {
 796                 gint extTypeC = tvb_get_ntohs(tvb, offset);
 797                 gint extType = extTypeC & 0x3FFF;
 798                 gint len  = tvb_get_ntohs(tvb, offset+2);
 799                 nhrp_tree_item =  proto_tree_add_text(tree, tvb, offset,
 800                     len + 4, "%s",
 801                     val_to_str(extType, ext_type_vals, "Unknown (%u)"));
 802                 nhrp_tree = proto_item_add_subtree(nhrp_tree_item, ett_nhrp_ext);
 803                 proto_tree_add_boolean(nhrp_tree, hf_nhrp_ext_C, tvb, offset, 2, extTypeC);
 804                 proto_tree_add_item(nhrp_tree, hf_nhrp_ext_type, tvb, offset, 2, FALSE);
 805                 offset += 2;
 806
 807                 proto_tree_add_item(nhrp_tree, hf_nhrp_ext_len, tvb, offset, 2, FALSE);
 808                 offset += 2;
 809
 810                 if (len) {
 811                         tvb_ensure_bytes_exist(tvb, offset, len);
 812                         switch (extType) {
 813                         case NHRP_EXT_RESP_ADDR:
 814                         case NHRP_EXT_FWD_RECORD:
 815                         case NHRP_EXT_REV_RECORD:
 816                         case NHRP_EXT_NAT_ADDRESS:
 817                                 dissect_cie_list(tvb, nhrp_tree,
 818                                     offset, offset + len, hdr, 0);
 819                                 break;
 820                         default:
 821                                 proto_tree_add_text(nhrp_tree, tvb, offset, len,
 822                                     "Extension Value: %s",
 823                                     tvb_bytes_to_str(tvb, offset, len));
 824                                 break;
 825                         }
 826                         offset += len;
 827                 }
 828         }
 829
 830         *pOffset = extEnd;
 831 }
 832
 833 void dissect_nhrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 834 {
 835         e_nhrp_hdr hdr;
 836         gint mandLen = 0;
 837         gint extLen = 0;
 838         gint offset = 0;
 839         proto_item *ti = NULL;
 840         proto_tree *nhrp_tree = NULL;
 841         oui_info_t *oui_info;
 842
 843         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
 844                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "NHRP");
 845         }
 846         if (check_col(pinfo->cinfo, COL_INFO)) {
 847                 col_clear(pinfo->cinfo, COL_INFO);
 848         }
 849
 850         memset(&hdr, 0, sizeof(e_nhrp_hdr));
 851
 852         hdr.ar_op_type = tvb_get_guint8(tvb, 17);
 853
 854         if (check_col(pinfo->cinfo, COL_INFO)) {
 855                 col_add_str(pinfo->cinfo, COL_INFO,
 856                     val_to_str(hdr.ar_op_type, nhrp_op_type_vals,
 857                                "0x%02X - unknown"));
 858         }
 859         col_set_writable(pinfo->cinfo, FALSE);
 860
 861         ti = proto_tree_add_protocol_format(tree, proto_nhrp, tvb, 0, -1,
 862             "Next Hop Resolution Protocol (%s)",
 863             val_to_str(hdr.ar_op_type, nhrp_op_type_vals, "0x%02X - unknown"));
 864         nhrp_tree = proto_item_add_subtree(ti, ett_nhrp);
 865
 866         dissect_nhrp_hdr(tvb, pinfo, nhrp_tree, &offset, &mandLen, &extLen,
 867             &oui_info, &hdr);
 868         if (mandLen) {
 869                 dissect_nhrp_mand(tvb, pinfo, nhrp_tree, &offset, mandLen,
 870                     oui_info, &hdr);
 871         }
 872
 873         if (extLen) {
 874                 dissect_nhrp_ext(tvb, nhrp_tree, &offset, extLen, &hdr);
 875         }
 876 }
 877
 878 void
 879 proto_register_nhrp(void)
 880 {
 881         static hf_register_info hf[] = {
 882
 883                 { &hf_nhrp_hdr_afn,
 884                   { "Address Family Number",            "nhrp.hdr.afn",         FT_UINT16, BASE_HEX_DEC, VALS(afn_vals), 0x0, NULL, HFILL }},
 885                 { &hf_nhrp_hdr_pro_type,
 886                   { "Protocol Type (short form)",       "nhrp.hdr.pro.type",FT_UINT16, BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
 887                 { &hf_nhrp_hdr_pro_snap_oui,
 888                   { "Protocol Type (long form) - OUI",  "nhrp.hdr.pro.snap.oui",FT_UINT24, BASE_HEX, VALS(oui_vals), 0x0, NULL, HFILL }},
 889                 { &hf_nhrp_hdr_pro_snap_pid,
 890                   { "Protocol Type (long form) - PID",  "nhrp.hdr.pro.snap.pid",FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
 891                 { &hf_nhrp_hdr_hopcnt,
 892                   { "Hop Count",                                        "nhrp.hdr.hopcnt",      FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 893                 { &hf_nhrp_hdr_pktsz,
 894                   { "Packet Length",                            "nhrp.hdr.pktsz",       FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 895                 { &hf_nhrp_hdr_chksum,
 896                   { "Packet Checksum",                          "nhrp.hdr.chksum",      FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
 897                 { &hf_nhrp_hdr_extoff,
 898                   { "Extension Offset",                         "nhrp.hdr.extoff",      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 899                 { &hf_nhrp_hdr_version,
 900                   { "Version",                                          "nhrp.hdr.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 901                 { &hf_nhrp_hdr_op_type,
 902                   { "NHRP Packet Type",                         "nhrp.hdr.op.type", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 903                 { &hf_nhrp_hdr_shtl,
 904                   { "Source Address Type/Len",          "nhrp.hdr.shtl",        FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 905                 { &hf_nhrp_hdr_shtl_type,
 906                   { "Type",                                             "nhrp.hdr.shtl.type", FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK, NULL, HFILL }},
 907                 { &hf_nhrp_hdr_shtl_len,
 908                   { "Length",                                           "nhrp.hdr.shtl.len", FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK, NULL, HFILL }},
 909                 { &hf_nhrp_hdr_sstl,
 910                   { "Source SubAddress Type/Len",       "nhrp.hdr.sstl",        FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 911                 { &hf_nhrp_hdr_sstl_type,
 912                   { "Type",                                             "nhrp.hdr.sstl.type", FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK, NULL, HFILL }},
 913                 { &hf_nhrp_hdr_sstl_len,
 914                   { "Length",                                           "nhrp.hdr.sstl.len", FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK, NULL, HFILL }},
 915
 916                 { &hf_nhrp_src_proto_len,
 917                   { "Source Protocol Len",                      "nhrp.src.prot.len",FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 918                 { &hf_nhrp_dst_proto_len,
 919                   { "Destination Protocol Len",         "nhrp.dst.prot.len",FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 920                 { &hf_nhrp_flags,
 921                   { "Flags",                                            "nhrp.flags",           FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
 922                 { &hf_nhrp_flag_Q,
 923                   { "Is Router",                                        "nhrp.flag.q",          FT_BOOLEAN, 16, NULL, 0x8000, NULL, HFILL }},
 924                 { &hf_nhrp_flag_N,
 925                   { "Expected Purge Reply",                     "nhrp.flag.n",          FT_BOOLEAN, 16, NULL, 0x8000, NULL, HFILL }},
 926                 { &hf_nhrp_flag_A,
 927                   { "Authoritative",                            "nhrp.flag.a",          FT_BOOLEAN, 16, NULL, 0x4000, "A bit", HFILL }},
 928                 { &hf_nhrp_flag_D,
 929                   { "Stable Association",                       "nhrp.flag.d",          FT_BOOLEAN, 16, NULL, 0x2000, "D bit", HFILL }},
 930                 { &hf_nhrp_flag_U1,
 931                   { "Uniqueness Bit",                           "nhrp.flag.u1",         FT_BOOLEAN, 16, NULL, 0x1000, "U bit", HFILL }},
 932                 { &hf_nhrp_flag_U2,
 933                   { "Uniqueness Bit",                           "nhrp.flag.u1",         FT_BOOLEAN, 16, NULL, 0x8000, "U bit", HFILL }},
 934                 { &hf_nhrp_flag_S,
 935                   { "Stable Binding",                           "nhrp.flag.s",          FT_BOOLEAN, 16, NULL, 0x0800, "S bit", HFILL }},
 936                 { &hf_nhrp_flag_NAT,
 937                   { "Cisco NAT Supported",                      "nhrp.flag.nat",        FT_BOOLEAN, 16, NULL, 0x0002, "NAT bit", HFILL }},
 938                 { &hf_nhrp_request_id,
 939                   { "Request ID",                                       "nhrp.reqid",           FT_UINT32,      BASE_HEX_DEC, NULL, 0x0, NULL, HFILL }},
 940                 { &hf_nhrp_src_nbma_addr,
 941                   { "Source NBMA Address",                      "nhrp.src.nbma.addr",FT_IPv4,   BASE_NONE, NULL, 0x0, NULL, HFILL }},
 942                 { &hf_nhrp_src_nbma_saddr,
 943                   { "Source NBMA Sub Address",          "nhrp.src.nbma.saddr",FT_UINT_BYTES,BASE_HEX, NULL, 0x0, NULL, HFILL }},
 944                 { &hf_nhrp_src_prot_addr,
 945                   { "Source Protocol Address",          "nhrp.src.prot.addr",FT_IPv4,   BASE_NONE, NULL, 0x0, NULL, HFILL }},
 946                 { &hf_nhrp_dst_prot_addr,
 947                   { "Destination Protocol Address",     "nhrp.dst.prot.addr",FT_IPv4,   BASE_NONE, NULL, 0x0, NULL, HFILL }},
 948
 949                 { &hf_nhrp_code,
 950                   { "Code",                                     "nhrp.code",                    FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 951                 { &hf_nhrp_prefix_len,
 952                   { "Prefix Length",                    "nhrp.prefix",                  FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 953                 { &hf_nhrp_unused,
 954                   { "Unused",                                   "nhrp.unused",                  FT_UINT16,BASE_DEC, NULL, 0x0, NULL, HFILL }},
 955                 { &hf_nhrp_mtu,
 956                   { "Max Transmission Unit",    "nhrp.mtu",                     FT_UINT16,BASE_DEC, NULL, 0x0, NULL, HFILL }},
 957                 { &hf_nhrp_holding_time,
 958                   { "Holding Time (s)",                 "nhrp.htime",                   FT_UINT16,BASE_DEC, NULL, 0x0, NULL, HFILL }},
 959                 { &hf_nhrp_cli_addr_tl,
 960                   { "Client Address Type/Len",  "nhrp.cli.addr_tl",             FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 961                 { &hf_nhrp_cli_addr_tl_type,
 962                   { "Type",                                     "nhrp.cli.addr_tl.type",        FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK, NULL, HFILL }},
 963                 { &hf_nhrp_cli_addr_tl_len,
 964                   { "Length",                                   "nhrp.cli.addr_tl.len", FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK, NULL, HFILL }},
 965                 { &hf_nhrp_cli_saddr_tl,
 966                   { "Client Sub Address Type/Len","nhrp.cli.saddr_tl",  FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 967                 { &hf_nhrp_cli_saddr_tl_type,
 968                   { "Type",                                     "nhrp.cli.saddr_tl.type",       FT_UINT8, BASE_DEC, VALS(nhrp_shtl_type_vals), NHRP_SHTL_TYPE_MASK, NULL, HFILL }},
 969                 { &hf_nhrp_cli_saddr_tl_len,
 970                   { "Length",                                   "nhrp.cli.saddr_tl.len",        FT_UINT8, BASE_DEC, NULL, NHRP_SHTL_LEN_MASK, NULL, HFILL }},
 971                 { &hf_nhrp_cli_prot_len,
 972                   { "Client Protocol Length",   "nhrp.prot.len",                FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 973                 { &hf_nhrp_pref,
 974                   { "CIE Preference Value",             "nhrp.pref",                    FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
 975                 { &hf_nhrp_client_nbma_addr,
 976                   { "Client NBMA Address",              "nhrp.client.nbma.addr", FT_IPv4,               BASE_NONE, NULL, 0x0, NULL, HFILL }},
 977                 { &hf_nhrp_client_nbma_saddr,
 978                   { "Client NBMA Sub Address",  "nhrp.client.nbma.saddr",FT_UINT_BYTES, BASE_HEX,  NULL, 0x0, NULL, HFILL }},
 979                 { &hf_nhrp_client_prot_addr,
 980                   { "Client Protocol Address",  "nhrp.client.prot.addr", FT_IPv4,               BASE_NONE, NULL, 0x0, NULL, HFILL }},
 981
 982                 { &hf_nhrp_ext_C,
 983                   { "Compulsory Flag",                  "nhrp.ext.c",                   FT_BOOLEAN, 16, NULL, 0x8000, NULL, HFILL }},
 984                 { &hf_nhrp_ext_type,
 985                   { "Extension Type",                   "nhrp.ext.type",                FT_UINT16,      BASE_HEX, NULL, 0x3FFF, NULL, HFILL }},
 986                 { &hf_nhrp_ext_len,
 987                   { "Extension length",                 "nhrp.ext.len",                 FT_UINT16,      BASE_DEC, NULL, 0x0, NULL, HFILL }},
 988                 { &hf_nhrp_ext_value,
 989                   { "Extension Value",                  "nhrp.ext.val",                 FT_UINT_BYTES,BASE_HEX, NULL, 0x0, NULL, HFILL }},
 990
 991                 { &hf_nhrp_error_offset,
 992                   { "Error Offset",                     "nhrp.err.offset",              FT_UINT16,      BASE_DEC, NULL, 0x0, NULL, HFILL }},
 993                 { &hf_nhrp_error_packet,
 994                   { "Errored Packet",                   "nhrp.err.pkt",                 FT_UINT_BYTES,BASE_HEX, NULL, 0x0, NULL, HFILL }},
 995         };
 996
 997         static gint *ett[] = {
 998                 &ett_nhrp,
 999                 &ett_nhrp_hdr,
1000                 &ett_nhrp_hdr_shtl,
1001                 &ett_nhrp_hdr_sstl,
1002                 &ett_nhrp_mand,
1003                 &ett_nhrp_ext,
1004                 &ett_nhrp_mand_flag,
1005                 &ett_nhrp_cie,
1006                 &ett_nhrp_cie_cli_addr_tl,
1007                 &ett_nhrp_cie_cli_saddr_tl,
1008                 &ett_nhrp_indication
1009         };
1010
1011         proto_nhrp = proto_register_protocol(
1012                 "NBMA Next Hop Resolution Protocol",
1013                 "NHRP",
1014                 "nhrp");
1015         proto_register_field_array(proto_nhrp, hf, array_length(hf));
1016         proto_register_subtree_array(ett, array_length(ett));
1017 }
1018
1019 void
1020 proto_reg_handoff_nhrp(void)
1021 {
1022         dissector_handle_t nhrp_handle;
1023
1024         data_handle = find_dissector("data");
1025
1026         osinl_subdissector_table = find_dissector_table("osinl");
1027         osinl_excl_subdissector_table = find_dissector_table("osinl.excl");
1028         ethertype_subdissector_table = find_dissector_table("ethertype");
1029
1030         nhrp_handle = create_dissector_handle(dissect_nhrp, proto_nhrp);
1031         dissector_add("ip.proto", IP_PROTO_NARP, nhrp_handle);
1032         dissector_add("gre.proto", GRE_NHRP, nhrp_handle);
1033         dissector_add("llc.iana_pid", IANA_PID_MARS_NHRP_CONTROL, nhrp_handle);
1034 }