epan/dissectors/packet-igmp.c

   1 /* packet-igmp.c
   2  * Routines for IGMP packet disassembly
   3  * 2001 Ronnie Sahlberg
   4  * 2007 Thomas Morin
   5  * <See AUTHORS for emails>
   6  *
   7  * $Id$
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  26  */
  27 /*
  28         IGMP is defined in the following RFCs
  29         RFC988  Version 0       Obsolete
  30         RFC1054 Version 1
  31         RFC1112 Version 1       (same as RFC1054 as far as we are concerned)
  32         RFC2236 Version 2
  33         RFC3376 Version 3
  34
  35         Size in bytes for each packet
  36         type    RFC988  RFC1054 RFC2236 RFC3376  DVMRP  MRDISC  MSNIP  IGAP  RGMP
  37                 v0      v1      v2      v3       v1/v3
  38         0x01      20
  39         0x02      20
  40         0x03      20
  41         0x04      20
  42         0x05      20
  43         0x06      20
  44         0x07      20
  45         0x08      20
  46         0x11               8*     8*     >=12
  47         0x12               8*     8*
  48         0x13                                     x
  49         0x16                      8
  50         0x17                      8
  51         0x22                            >=8
  52         0x23                                                    >=8b
  53         0x24                                            >=8a    8b
  54         0x25                                            4a      >=8b
  55         0x26                                            4a
  56         0x40                                                           ??c
  57         0x41                                                           ??c
  58         0x42                                                           ??c
  59         0xfc                                                                  8
  60         0xfd                                                                  8
  61         0xfe                                                                  8
  62         0xff                                                                  8
  63
  64    * Differs in second byte of protocol. Always 0 in V1
  65
  66
  67         Multicast traceroute was taken from
  68         draft-ietf-idmr-traceroute-ipm-07.txt
  69
  70         Size in bytes for each packet
  71         type    draft-ietf-idmr-traceroute-ipm-07.ps
  72         0x1e      24 + n*32
  73         0x1f      24 + n*32 (n == 0 for Query)
  74
  75    x DVMRP Protocol  see packet-dvmrp.c
  76
  77         DVMRP is defined in the following RFCs
  78         RFC1075 Version 1
  79         draft-ietf-idmr-dvmrp-v3-10.txt Version 3
  80
  81         V1 and V3 can be distinguished by looking at bytes 6 and 7 in the
  82         IGMP header.
  83         If header[6]==0xff and header[7]==0x03 we have version 3.
  84
  85    a MRDISC Protocol  see packet-mrdisc.c
  86
  87         MRDISC : IGMP Multicast Router DISCovery
  88         draft-ietf-idmr-igmp-mrdisc-06.txt
  89         TTL == 1 and IP.DST==224.0.0.2 for all packets
  90
  91    b MSNIP Protocol  see packet-msnip.c
  92
  93         MSNIP : Multicast Source Notification of Interest Protocol
  94         draft-ietf-idmr-msnip-00.txt
  95         0x23, 0x24 are sent with ip.dst==224.0.0.22
  96         0x25 is sent as unicast.
  97
  98    c IGAP Protocol  see packet-igap.c
  99
 100         IGAP : Internet Group membership Authentication Protocol
 101         draft-hayashi-igap-03.txt
 102
 103    d RGMP Protocol  see packet-rgmp.c
 104
 105         RGMP : Router-port Group Management Protocol
 106         RFC3488
 107         TTL == 1 and IP.DST==224.0.0.25 for all packets
 108
 109 */
 110
 111 #ifdef HAVE_CONFIG_H
 112 # include "config.h"
 113 #endif
 114
 115 #include <stdio.h>
 116 #include <string.h>
 117 #include <glib.h>
 118
 119 #include <epan/packet.h>
 120 #include <epan/ipproto.h>
 121 #include <epan/in_cksum.h>
 122 #include "packet-igmp.h"
 123 #include "packet-dvmrp.h"
 124 #include "packet-pim.h"
 125 #include "packet-mrdisc.h"
 126 #include "packet-msnip.h"
 127 #include "packet-igap.h"
 128 #include "packet-rgmp.h"
 129
 130 static int proto_igmp = -1;
 131 static int hf_type = -1;
 132 static int hf_version = -1;
 133 static int hf_group_type = -1;
 134 static int hf_reply_code = -1;
 135 static int hf_reply_pending = -1;
 136 static int hf_checksum = -1;
 137 static int hf_checksum_bad = -1;
 138 static int hf_identifier = -1;
 139 static int hf_access_key = -1;
 140 static int hf_max_resp = -1;
 141 static int hf_max_resp_exp = -1;
 142 static int hf_max_resp_mant = -1;
 143 static int hf_suppress = -1;
 144 static int hf_qrv = -1;
 145 static int hf_qqic = -1;
 146 static int hf_num_src = -1;
 147 static int hf_saddr = -1;
 148 static int hf_num_grp_recs = -1;
 149 static int hf_record_type = -1;
 150 static int hf_aux_data_len = -1;
 151 static int hf_maddr = -1;
 152 static int hf_aux_data = -1;
 153 static int hf_mtrace_max_hops = -1;
 154 static int hf_mtrace_saddr = -1;
 155 static int hf_mtrace_raddr = -1;
 156 static int hf_mtrace_rspaddr = -1;
 157 static int hf_mtrace_resp_ttl = -1;
 158 static int hf_mtrace_q_id = -1;
 159 static int hf_mtrace_q_arrival = -1;
 160 static int hf_mtrace_q_inaddr = -1;
 161 static int hf_mtrace_q_outaddr = -1;
 162 static int hf_mtrace_q_prevrtr = -1;
 163 static int hf_mtrace_q_inpkt = -1;
 164 static int hf_mtrace_q_outpkt = -1;
 165 static int hf_mtrace_q_total = -1;
 166 static int hf_mtrace_q_rtg_proto = -1;
 167 static int hf_mtrace_q_fwd_ttl = -1;
 168 static int hf_mtrace_q_mbz = -1;
 169 static int hf_mtrace_q_s = -1;
 170 static int hf_mtrace_q_src_mask = -1;
 171 static int hf_mtrace_q_fwd_code = -1;
 172
 173 static int ett_igmp = -1;
 174 static int ett_group_record = -1;
 175 static int ett_sqrv_bits = -1;
 176 static int ett_max_resp = -1;
 177 static int ett_mtrace_block = -1;
 178
 179 #define MC_ALL_ROUTERS          0xe0000002
 180 #define MC_ALL_IGMPV3_ROUTERS   0xe0000016
 181 #define MC_RGMP                 0xe0000019
 182
 183
 184 #define IGMP_V0_CREATE_GROUP_REQUEST    0x01
 185 #define IGMP_V0_CREATE_GROUP_REPLY      0x02
 186 #define IGMP_V0_JOIN_GROUP_REQUEST      0x03
 187 #define IGMP_V0_JOIN_GROUP_REPLY        0x04
 188 #define IGMP_V0_LEAVE_GROUP_REQUEST     0x05
 189 #define IGMP_V0_LEAVE_GROUP_REPLY       0x06
 190 #define IGMP_V0_CONFIRM_GROUP_REQUEST   0x07
 191 #define IGMP_V0_CONFIRM_GROUP_REPLY     0x08
 192 #define IGMP_V1_HOST_MEMBERSHIP_QUERY   0x11
 193 #define IGMP_V1_HOST_MEMBERSHIP_REPORT  0x12
 194 #define IGMP_DVMRP                      0x13
 195 #define IGMP_V1_PIM_ROUTING_MESSAGE     0x14
 196 #define IGMP_V2_MEMBERSHIP_REPORT       0x16
 197 #define IGMP_V2_LEAVE_GROUP             0x17
 198 #define IGMP_TRACEROUTE_RESPONSE        0x1e
 199 #define IGMP_TRACEROUTE_QUERY_REQ       0x1f
 200 #define IGMP_V3_MEMBERSHIP_REPORT       0x22
 201 #define IGMP_TYPE_0x23                  0x23
 202 #define IGMP_TYPE_0x24                  0x24
 203 #define IGMP_TYPE_0x25                  0x25
 204 #define IGMP_TYPE_0x26                  0x26
 205
 206 #define IGMP_TRACEROUTE_HDR_LEN           24
 207 #define IGMP_TRACEROUTE_RSP_LEN           32
 208
 209 static const value_string commands[] = {
 210         {IGMP_V0_CREATE_GROUP_REQUEST,  "Create Group Request"          },
 211         {IGMP_V0_CREATE_GROUP_REPLY,    "Create Group Reply"            },
 212         {IGMP_V0_JOIN_GROUP_REQUEST,    "Join Group Request"            },
 213         {IGMP_V0_JOIN_GROUP_REPLY,      "Join Group Reply"              },
 214         {IGMP_V0_LEAVE_GROUP_REQUEST,   "Leave Group Request"           },
 215         {IGMP_V0_LEAVE_GROUP_REPLY,     "Leave Group Reply"             },
 216         {IGMP_V0_CONFIRM_GROUP_REQUEST, "Confirm Group Request"         },
 217         {IGMP_V0_CONFIRM_GROUP_REPLY,   "Confirm Group Reply"           },
 218         {IGMP_V1_HOST_MEMBERSHIP_QUERY, "Membership Query"              },
 219         {IGMP_V1_HOST_MEMBERSHIP_REPORT,"Membership Report"             },
 220         {IGMP_DVMRP,                    "DVMRP Protocol"                },
 221         {IGMP_V1_PIM_ROUTING_MESSAGE,   "PIM Routing Message"           },
 222         {IGMP_V2_MEMBERSHIP_REPORT,     "Membership Report"             },
 223         {IGMP_V2_LEAVE_GROUP,           "Leave Group"                   },
 224         {IGMP_TRACEROUTE_RESPONSE,      "Traceroute Response"           },
 225         {IGMP_TRACEROUTE_QUERY_REQ,     "Traceroute Query or Request"   },
 226         {IGMP_V3_MEMBERSHIP_REPORT,     "Membership Report"             },
 227         {0,             NULL}
 228 };
 229
 230 #define IGMP_V3_S               0x08
 231 #define IGMP_V3_QRV_MASK        0x07
 232
 233 #define IGMP_MAX_RESP_EXP       0x70
 234 #define IGMP_MAX_RESP_MANT      0x0f
 235
 236 #define IGMP_V0_GROUP_PUBLIC    0x00
 237 #define IGMP_V0_GROUP_PRIVATE   0x01
 238
 239 static const value_string vs_group_type[] = {
 240         {IGMP_V0_GROUP_PUBLIC,          "Public Group"                  },
 241         {IGMP_V0_GROUP_PRIVATE,         "Private Group"                 },
 242         {0,             NULL}
 243 };
 244
 245 #define IGMP_V0_REPLY_GRANTED   0x00
 246 #define IGMP_V0_REPLY_NO_RESOURCES      0x01
 247 #define IGMP_V0_REPLY_INVALID_CODE      0x02
 248 #define IGMP_V0_REPLY_INVALID_GROUP     0x03
 249 #define IGMP_V0_REPLY_INVALID_KEY       0x04
 250
 251 static const value_string vs_reply_code[] = {
 252         {IGMP_V0_REPLY_GRANTED, "Request Granted"       },
 253         {IGMP_V0_REPLY_NO_RESOURCES,    "Request Denied, No Resources"  },
 254         {IGMP_V0_REPLY_INVALID_CODE,    "Request Denied, Invalid Code"  },
 255         {IGMP_V0_REPLY_INVALID_GROUP,   "Request Denied, Invalid Group" },
 256         {IGMP_V0_REPLY_INVALID_KEY,     "Request Denied, Invalid Key"   },
 257         {0,             NULL}
 258 };
 259
 260 static const true_false_string tfs_s = {
 261         "SUPPRESS router side processing",
 262         "Do not suppress router side processing"
 263 };
 264
 265 #define IGMP_V3_MODE_IS_INCLUDE         1
 266 #define IGMP_V3_MODE_IS_EXCLUDE         2
 267 #define IGMP_V3_CHANGE_TO_INCLUDE_MODE  3
 268 #define IGMP_V3_CHANGE_TO_EXCLUDE_MODE  4
 269 #define IGMP_V3_ALLOW_NEW_SOURCES       5
 270 #define IGMP_V3_BLOCK_OLD_SOURCES       6
 271
 272 static const value_string vs_record_type[] = {
 273         {IGMP_V3_MODE_IS_INCLUDE,       "Mode Is Include"               },
 274         {IGMP_V3_MODE_IS_EXCLUDE,       "Mode Is Exclude"               },
 275         {IGMP_V3_CHANGE_TO_INCLUDE_MODE,"Change To Include Mode"        },
 276         {IGMP_V3_CHANGE_TO_EXCLUDE_MODE,"Change To Exclude Mode"        },
 277         {IGMP_V3_ALLOW_NEW_SOURCES,     "Allow New Sources"             },
 278         {IGMP_V3_BLOCK_OLD_SOURCES,     "Block Old Sources"             },
 279         { 0,    NULL}
 280 };
 281
 282 static const value_string mtrace_rtg_vals[] = {
 283         {1,  "DVMRP"                                        },
 284         {2,  "MOSPF"                                        },
 285         {3,  "PIM"                                          },
 286         {4,  "CBT"                                          },
 287         {5,  "PIM using special routing table"              },
 288         {6,  "PIM using a static route"                     },
 289         {7,  "DVMRP using a static route"                   },
 290         {8,  "PIM using MBGP (aka BGP4+) route"             },
 291         {9,  "CBT using special routing table"              },
 292         {10, "CBT using a static route"                     },
 293         {11, "PIM using state created by Assert processing" },
 294         {0,  NULL}
 295 };
 296
 297 static const value_string mtrace_fwd_code_vals[] = {
 298         {0x00, "NO_ERROR"       },
 299         {0x01, "WRONG_IF"       },
 300         {0x02, "PRUNE_SENT"     },
 301         {0x03, "PRUNE_RCVD"     },
 302         {0x04, "SCOPED"         },
 303         {0x05, "NO_ROUTE"       },
 304         {0x06, "WRONG_LAST_HOP" },
 305         {0x07, "NOT_FORWARDING" },
 306         {0x08, "REACHED_RP"     },
 307         {0x09, "RPF_IF"         },
 308         {0x0A, "NO_MULTICAST"   },
 309         {0x0B, "INFO_HIDDEN"    },
 310         {0x81, "NO_SPACE"       },
 311         {0x82, "OLD_ROUTER"     },
 312         {0x83, "ADMIN_PROHIB"   },
 313         {0, NULL}
 314 };
 315
 316 #define PRINT_IGMP_VERSION(version)                                     \
 317         if (check_col(pinfo->cinfo, COL_INFO)) {                        \
 318                 col_add_fstr(pinfo->cinfo, COL_INFO,                    \
 319                         "V%d %s",version,val_to_str(type, commands,     \
 320                                 "Unknown Type:0x%02x"));                \
 321         }                                                               \
 322         /* version of IGMP protocol */                                  \
 323         proto_tree_add_uint(tree, hf_version, tvb, 0, 0, version);      \
 324         /* type of command */                                           \
 325         proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);       \
 326         offset += 1;
 327
 328 void igmp_checksum(proto_tree *tree, tvbuff_t *tvb, int hf_index,
 329     int hf_index_bad, packet_info *pinfo, guint len)
 330 {
 331         guint16 cksum, hdrcksum;
 332         vec_t cksum_vec[1];
 333         proto_item *hidden_item;
 334
 335         if (len == 0) {
 336                 /*
 337                  * Checksum the entire IGMP packet.
 338                  */
 339                 len = tvb_reported_length(tvb);
 340         }
 341
 342         hdrcksum = tvb_get_ntohs(tvb, 2);
 343         if (!pinfo->fragmented && tvb_length(tvb) >= len) {
 344                 /*
 345                  * The packet isn't part of a fragmented datagram and isn't
 346                  * truncated, so we can checksum it.
 347                  */
 348                 cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, len);
 349                 cksum_vec[0].len = len;
 350
 351                 cksum = in_cksum(&cksum_vec[0],1);
 352
 353                 if (cksum == 0) {
 354                         proto_tree_add_uint_format(tree, hf_index,
 355                             tvb, 2, 2, hdrcksum,
 356                             "Header checksum: 0x%04x [correct]", hdrcksum);
 357                 } else {
 358                         hidden_item = proto_tree_add_boolean(tree, hf_index_bad,
 359                             tvb, 2, 2, TRUE);
 360                         PROTO_ITEM_SET_HIDDEN(hidden_item);
 361                         proto_tree_add_uint_format(tree, hf_index,
 362                             tvb, 2, 2, hdrcksum,
 363                             "Header checksum: 0x%04x [incorrect, should be 0x%04x]", hdrcksum,in_cksum_shouldbe(hdrcksum,cksum));
 364                 }
 365         } else
 366                 proto_tree_add_uint(tree, hf_index, tvb, 2, 2, hdrcksum);
 367
 368         return;
 369 }
 370
 371
 372 /* Unknown IGMP message type */
 373 static int
 374 dissect_igmp_unknown(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 375 {
 376         int len;
 377
 378         if (check_col(pinfo->cinfo, COL_INFO)) {
 379                 col_add_str(pinfo->cinfo, COL_INFO,
 380                         val_to_str(type, commands, "Unknown Type:0x%02x"));
 381         }
 382
 383         /* type of command */
 384         proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
 385         offset += 1;
 386
 387         /* Just call the rest of it "data" */
 388         len = tvb_length_remaining(tvb, offset);
 389         proto_tree_add_text(tree, tvb, offset, len, "Data");
 390         offset += len;
 391
 392         return offset;
 393 }
 394
 395
 396
 397 /*************************************************************
 398  * IGMP Protocol dissectors
 399  *************************************************************/
 400 static int
 401 dissect_v3_max_resp(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 402 {
 403         proto_tree *tree;
 404         proto_item *item;
 405         guint8 bits;
 406         guint32 tsecs;
 407
 408         bits = tvb_get_guint8(tvb, offset);
 409         if (bits&0x80) {
 410                 tsecs = ((bits&IGMP_MAX_RESP_MANT)|0x10);
 411                 tsecs = tsecs << ( ((bits&IGMP_MAX_RESP_EXP)>>4) + 3);
 412         } else {
 413                 tsecs = bits;
 414         }
 415
 416         item = proto_tree_add_uint_format(parent_tree, hf_max_resp, tvb,
 417                         offset, 1, tsecs, "Max Response Time: %.1f sec (0x%02x)",tsecs*0.1,bits);
 418
 419         if (bits&0x80) {
 420                 tree = proto_item_add_subtree(item, ett_max_resp);
 421
 422                 proto_tree_add_uint(tree, hf_max_resp_exp, tvb, offset, 1,
 423                         bits);
 424                 proto_tree_add_uint(tree, hf_max_resp_mant, tvb, offset, 1,
 425                         bits);
 426         }
 427
 428         offset += 1;
 429
 430         return offset;
 431 }
 432
 433 static int
 434 dissect_v3_sqrv_bits(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 435 {
 436         proto_tree *tree;
 437         proto_item *item;
 438         guint8 bits;
 439
 440         bits = tvb_get_guint8(tvb, offset);
 441
 442         item = proto_tree_add_text(parent_tree, tvb, offset, 1,
 443                 "QRV=%d S=%s", bits&IGMP_V3_QRV_MASK,
 444                         (bits&IGMP_V3_S)?tfs_s.true_string:tfs_s.false_string);
 445         tree = proto_item_add_subtree(item, ett_sqrv_bits);
 446
 447         /* S flag */
 448         proto_tree_add_boolean(tree, hf_suppress, tvb, offset, 1, bits);
 449         /* QRV */
 450         proto_tree_add_uint(tree, hf_qrv, tvb, offset, 1, bits);
 451         offset += 1;
 452
 453         return offset;
 454 }
 455
 456 static int
 457 dissect_v3_group_record(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
 458 {
 459         proto_tree *tree;
 460         proto_item *item;
 461         int old_offset = offset;
 462         guint8  adl;
 463         guint16 num;
 464         guint32 ip;
 465         guint32 maddr;
 466         guint8 record_type;
 467
 468         ip = tvb_get_ipv4(tvb, offset+4);
 469         item = proto_tree_add_text(parent_tree, tvb, offset, -1,
 470                 "Group Record : %s  %s",
 471                         ip_to_str((guint8*)&ip),
 472                         val_to_str(tvb_get_guint8(tvb, offset), vs_record_type,"")
 473                 );
 474         tree = proto_item_add_subtree(item, ett_group_record);
 475
 476         /* record type */
 477         record_type = tvb_get_guint8(tvb, offset);
 478         proto_tree_add_item(tree, hf_record_type, tvb, offset, 1, FALSE);
 479         offset += 1;
 480
 481         /* aux data len */
 482         adl = tvb_get_guint8(tvb, offset);
 483         proto_tree_add_uint(tree, hf_aux_data_len, tvb, offset, 1, adl);
 484         offset += 1;
 485
 486         /*number of sources*/
 487         num = tvb_get_ntohs(tvb, offset);
 488         proto_tree_add_uint(tree, hf_num_src, tvb, offset, 2, num);
 489         offset += 2;
 490
 491         /* multicast address */
 492         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
 493         maddr = tvb_get_ipv4(tvb, offset);
 494         offset += 4;
 495
 496         if (check_col(pinfo->cinfo, COL_INFO)) {
 497            if (num == 0) {
 498               switch(record_type) {
 499                case IGMP_V3_MODE_IS_INCLUDE:
 500                case IGMP_V3_CHANGE_TO_INCLUDE_MODE:
 501                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Leave group %s",
 502                                    ip_to_str((guint8*)&maddr) );
 503                    break;
 504                case IGMP_V3_MODE_IS_EXCLUDE:
 505                case IGMP_V3_CHANGE_TO_EXCLUDE_MODE:
 506                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Join group %s for any sources",
 507                                    ip_to_str((guint8*)&maddr) );
 508                    break;
 509                case IGMP_V3_ALLOW_NEW_SOURCES:
 510                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Group %s, ALLOW_NEW_SOURCES but no source specified (?)",
 511                                                            ip_to_str((guint8*)&maddr) );
 512                    break;
 513                case IGMP_V3_BLOCK_OLD_SOURCES:
 514                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Group %s, BLOCK_OLD_SOURCES but no source specified (?)",
 515                                                            ip_to_str((guint8*)&maddr) );
 516                    break;
 517                default:
 518                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Group %s, unknown record type (?)",
 519                                                            ip_to_str((guint8*)&maddr) );
 520               }
 521            } else {
 522               switch(record_type) {
 523                case IGMP_V3_MODE_IS_INCLUDE:
 524                case IGMP_V3_CHANGE_TO_INCLUDE_MODE:
 525                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Join group %s for source%s {",
 526                                    ip_to_str((guint8*)&maddr),
 527                                    (num>1) ? "s in" : "" );
 528                    break;
 529                case IGMP_V3_MODE_IS_EXCLUDE:
 530                case IGMP_V3_CHANGE_TO_EXCLUDE_MODE:
 531                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Join group %s, for source%s {",
 532                                    ip_to_str((guint8*)&maddr),
 533                                    (num>1) ? "s not in" : " not" );
 534                    break;
 535                case IGMP_V3_ALLOW_NEW_SOURCES:
 536                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Group %s, new source%s {",
 537                                    ip_to_str((guint8*)&maddr),
 538                                    (num>1) ? "s" : "" );
 539                    break;
 540                case IGMP_V3_BLOCK_OLD_SOURCES:
 541                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Group %s, block source%s {",
 542                                    ip_to_str((guint8*)&maddr),
 543                                    (num>1) ? "s" : "" );
 544                    break;
 545                default:
 546                    col_append_fstr(pinfo->cinfo, COL_INFO, " / Group %s, unknown record type (?), sources {",
 547                                                            ip_to_str((guint8*)&maddr) );
 548               }
 549            }
 550         }
 551
 552         /* source addresses */
 553         while(num--){
 554                 if (check_col(pinfo->cinfo, COL_INFO)) {
 555                    col_append_fstr(pinfo->cinfo, COL_INFO, "%s%s",
 556                                          ip_to_str(tvb_get_ptr(tvb, offset, 4)),
 557                                          (num?", ":"}")
 558                                   );
 559                 }
 560                 proto_tree_add_item(tree, hf_saddr, tvb, offset, 4, FALSE);
 561                 offset += 4;
 562         }
 563
 564         /* aux data */
 565         if(adl){
 566                 proto_tree_add_item(tree, hf_aux_data, tvb, offset, adl*4,
 567                     FALSE);
 568                 offset += adl*4;
 569         }
 570
 571         proto_item_set_len(item, offset-old_offset);
 572         return offset;
 573 }
 574
 575 /* dissectors for version 3, rfc3376 */
 576 static int
 577 dissect_igmp_v3_report(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 578 {
 579         guint16 num;
 580
 581         PRINT_IGMP_VERSION(3);
 582
 583         /* skip reserved field*/
 584         offset += 1;
 585
 586         /* checksum */
 587         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
 588         offset += 2;
 589
 590         /* skip reserved field */
 591         offset += 2;
 592
 593         /* number of group records */
 594         num = tvb_get_ntohs(tvb, offset);
 595         if (check_col(pinfo->cinfo, COL_INFO)) {
 596           if (!num) {
 597               col_append_fstr(pinfo->cinfo, COL_INFO, " - General query" );
 598           }
 599         }
 600         proto_tree_add_uint(tree, hf_num_grp_recs, tvb, offset, 2, num);
 601         offset += 2;
 602
 603         while (num--) {
 604                 offset = dissect_v3_group_record(tvb, pinfo, tree, offset);
 605         }
 606
 607         return offset;
 608 }
 609
 610 static int
 611 dissect_igmp_v3_query(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 612 {
 613         guint16 num;
 614         guint32 maddr;
 615
 616         PRINT_IGMP_VERSION(3);
 617
 618         num = tvb_get_ntohs(tvb, offset+9);
 619         /* max resp code */
 620         offset = dissect_v3_max_resp(tvb, tree, offset);
 621
 622         /* checksum */
 623         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
 624         offset += 2;
 625
 626         /* group address */
 627         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
 628
 629         maddr = tvb_get_ipv4(tvb, offset);
 630         if (check_col(pinfo->cinfo, COL_INFO)) {
 631            if (! maddr) {
 632                col_append_fstr(pinfo->cinfo, COL_INFO, ", general" );
 633            } else {
 634                col_append_fstr(pinfo->cinfo, COL_INFO, ", specific for group %s"
 635                    , ip_to_str((guint8*)&maddr) );
 636            }
 637         }
 638
 639         offset +=4;
 640
 641         /* bitmask for S and QRV */
 642         offset = dissect_v3_sqrv_bits(tvb, tree, offset);
 643
 644         /* qqic */
 645         proto_tree_add_item(tree, hf_qqic, tvb, offset, 1, FALSE);
 646         offset += 1;
 647
 648         /*number of sources*/
 649         proto_tree_add_uint(tree, hf_num_src, tvb, offset, 2, num);
 650         if (num) {
 651             if (check_col(pinfo->cinfo, COL_INFO))
 652                 col_append_fstr(pinfo->cinfo, COL_INFO, ", source%s {", (num>1)?"s":"");
 653         }
 654         offset += 2;
 655
 656         while(num--){
 657                 if (check_col(pinfo->cinfo, COL_INFO))
 658                     col_append_fstr(pinfo->cinfo, COL_INFO, "%s%s", ip_to_str(tvb_get_ptr(tvb, offset, 4)), (num?", ":"}"));
 659                 proto_tree_add_item(tree, hf_saddr, tvb, offset, 4, FALSE);
 660                 offset += 4;
 661         }
 662
 663         return offset;
 664 }
 665
 666 /* dissector for version 2 query and report, rfc2236 */
 667 static int
 668 dissect_igmp_v2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 669 {
 670         guint8 tsecs;
 671         guint32 maddr;
 672
 673         PRINT_IGMP_VERSION(2);
 674
 675         /* max resp time */
 676         tsecs = tvb_get_guint8(tvb, offset);
 677         proto_tree_add_uint_format(tree, hf_max_resp, tvb,
 678                 offset, 1, tsecs, "Max Response Time: %.1f sec (0x%02x)", tsecs*0.1,tsecs);
 679         offset += 1;
 680
 681         /* checksum */
 682         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 8);
 683         offset += 2;
 684
 685         /* group address */
 686         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
 687
 688         maddr = tvb_get_ipv4(tvb, offset);
 689         if (check_col(pinfo->cinfo, COL_INFO)) {
 690                 if (! maddr) {
 691                     col_append_fstr(pinfo->cinfo, COL_INFO, ", general" );
 692                 } else {
 693                     if (type == IGMP_V2_LEAVE_GROUP) {
 694                        col_append_fstr(pinfo->cinfo, COL_INFO, " %s", ip_to_str((guint8*)&maddr) );
 695                     } else {
 696                        col_append_fstr(pinfo->cinfo, COL_INFO, " / Join group %s", ip_to_str((guint8*)&maddr) );
 697                     }
 698                 }
 699         }
 700         offset +=4;
 701
 702         return offset;
 703 }
 704
 705 /* dissector for version 1 query and report, rfc1054 */
 706 static int
 707 dissect_igmp_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 708 {
 709         PRINT_IGMP_VERSION(1);
 710
 711         /* skip unused byte */
 712         offset += 1;
 713
 714         /* checksum */
 715         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 8);
 716         offset += 2;
 717
 718         /* group address */
 719         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
 720         offset +=4;
 721
 722         return offset;
 723 }
 724
 725 /* dissector for version 0, rfc988 */
 726 static int
 727 dissect_igmp_v0(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 728 {
 729         unsigned char code;
 730
 731         PRINT_IGMP_VERSION(0);
 732
 733         /* Code */
 734         code = tvb_get_guint8(tvb, offset);
 735         if (type==IGMP_V0_CREATE_GROUP_REQUEST) {
 736                 proto_tree_add_uint(tree, hf_group_type, tvb, offset, 1, code);
 737         } else if (!(type&0x01)) {
 738                 if (code <5) {
 739                         proto_tree_add_uint(tree, hf_reply_code, tvb, offset, 1, code);
 740                 } else {
 741                         proto_tree_add_uint(tree, hf_reply_pending, tvb, offset, 1, code);
 742                 }
 743         }
 744         offset += 1;
 745
 746         /* checksum */
 747         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 20);
 748         offset += 2;
 749
 750         /* identifier */
 751         proto_tree_add_item(tree, hf_identifier, tvb, offset, 4, FALSE);
 752         offset += 4;
 753
 754         /* group address */
 755         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
 756         offset +=4;
 757
 758         /* access key */
 759         proto_tree_add_item(tree, hf_access_key, tvb, offset, 8, FALSE);
 760         offset +=8;
 761
 762         return offset;
 763 }
 764
 765 /* dissector for multicast traceroute, rfc???? */
 766 static int
 767 dissect_igmp_mtrace(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 768 {
 769         const char *typestr, *blocks = NULL;
 770         char buf[20];
 771
 772         /* All multicast traceroute packets (Query, Request and
 773          * Response) have the same fixed header. Request and Response
 774          * have one or more response data blocks following this fixed
 775          * header. Since Query and Request share the same IGMP type,
 776          * the method to differentiate between them is to check the
 777          * IGMP packet length. Queries are only
 778          * IGMP_TRACEROUTE_HDR_LEN bytes long.
 779          */
 780         if (type == IGMP_TRACEROUTE_RESPONSE) {
 781                 int i = (tvb_reported_length_remaining(tvb, offset) - IGMP_TRACEROUTE_HDR_LEN) / IGMP_TRACEROUTE_RSP_LEN;
 782                 g_snprintf(buf, sizeof buf, ", %d block%s", i, plurality(i, "", "s"));
 783                 typestr = "Traceroute Response";
 784                 blocks = buf;
 785         } else if (tvb_reported_length_remaining(tvb, offset) == IGMP_TRACEROUTE_HDR_LEN)
 786                 typestr = "Traceroute Query";
 787         else
 788                 typestr = "Traceroute Request";
 789
 790         if (check_col(pinfo->cinfo, COL_INFO)) {
 791                 col_set_str(pinfo->cinfo, COL_INFO, typestr);
 792                 if (blocks) col_append_str(pinfo->cinfo, COL_INFO, blocks);
 793         }
 794
 795         proto_tree_add_uint_format(tree, hf_type, tvb, offset, 1, type,
 796             "Type: %s (0x%02x)", typestr, type);
 797         offset += 1;
 798
 799         /* maximum number of hops that the requester wants to trace */
 800         proto_tree_add_item(tree, hf_mtrace_max_hops, tvb, offset, 1, FALSE);
 801         offset += 1;
 802
 803         /* checksum */
 804         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
 805         offset += 2;
 806
 807         /* group address to be traced */
 808         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE);
 809         offset += 4;
 810
 811         /* address of multicast source for the path being traced */
 812         proto_tree_add_item(tree, hf_mtrace_saddr, tvb, offset, 4, FALSE);
 813         offset += 4;
 814
 815         /* address of multicast receiver for the path being traced */
 816         proto_tree_add_item(tree, hf_mtrace_raddr, tvb, offset, 4, FALSE);
 817         offset += 4;
 818
 819         /* address where the completed traceroute response packet gets sent */
 820         proto_tree_add_item(tree, hf_mtrace_rspaddr, tvb, offset, 4, FALSE);
 821         offset += 4;
 822
 823         /* for multicasted responses, TTL at which to multicast the response */
 824         proto_tree_add_item(tree, hf_mtrace_resp_ttl, tvb, offset, 1, FALSE);
 825         offset += 1;
 826
 827         /* unique identifier for this traceroute request (for e.g. duplicate/delay detection) */
 828         proto_tree_add_item(tree, hf_mtrace_q_id, tvb, offset, 3, FALSE);
 829         offset += 3;
 830
 831         /* If this was Query, we only had the fixed header */
 832         if (tvb_reported_length_remaining(tvb, offset) == 0)
 833                 return offset;
 834
 835         /* Loop through the response data blocks */
 836         while (tvb_reported_length_remaining(tvb, offset) >= IGMP_TRACEROUTE_RSP_LEN) {
 837                 proto_item *bi;
 838                 proto_tree *block_tree;
 839
 840                 bi = proto_tree_add_text(tree, tvb, offset, IGMP_TRACEROUTE_RSP_LEN,
 841                                          "Response data block: %s -> %s,  Proto: %s,  Forwarding Code: %s",
 842                                          ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)),
 843                                          ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)),
 844                                          val_to_str(tvb_get_guint8(tvb, offset + 28), mtrace_rtg_vals, "Unknown"),
 845                                          val_to_str(tvb_get_guint8(tvb, offset + 31), mtrace_fwd_code_vals, "Unknown"));
 846                 block_tree = proto_item_add_subtree(bi, ett_mtrace_block);
 847
 848                 /* Query Arrival Time */
 849                 proto_tree_add_item(block_tree, hf_mtrace_q_arrival, tvb, offset, 4, FALSE);
 850                 offset += 4;
 851
 852                 /* Incoming Interface Address */
 853                 proto_tree_add_item(block_tree, hf_mtrace_q_inaddr, tvb, offset, 4, FALSE);
 854                 offset += 4;
 855
 856                 /* Outgoing Interface Address */
 857                 proto_tree_add_item(block_tree, hf_mtrace_q_outaddr, tvb, offset, 4, FALSE);
 858                 offset += 4;
 859
 860                 /* Previous-Hop Router Address */
 861                 proto_tree_add_item(block_tree, hf_mtrace_q_prevrtr, tvb, offset, 4, FALSE);
 862                 offset += 4;
 863
 864                 /* Input packet count on incoming interface */
 865                 proto_tree_add_item(block_tree, hf_mtrace_q_inpkt, tvb, offset, 4, FALSE);
 866                 offset += 4;
 867
 868                 /* Output packet count on outgoing interface */
 869                 proto_tree_add_item(block_tree, hf_mtrace_q_outpkt, tvb, offset, 4, FALSE);
 870                 offset += 4;
 871
 872                 /* Total number of packets for this source-group pair */
 873                 proto_tree_add_item(block_tree, hf_mtrace_q_total, tvb, offset, 4, FALSE);
 874                 offset += 4;
 875
 876                 /* Routing protocol in use between this and previous-hop router */
 877                 proto_tree_add_item(block_tree, hf_mtrace_q_rtg_proto, tvb, offset, 1, FALSE);
 878                 offset += 1;
 879
 880                 /* TTL that a packet is required to be forwarded */
 881                 proto_tree_add_item(block_tree, hf_mtrace_q_fwd_ttl, tvb, offset, 1, FALSE);
 882                 offset += 1;
 883
 884                 /* Must be zeroed and ignored bit, S bit and src network mask length */
 885                 proto_tree_add_item(block_tree, hf_mtrace_q_mbz, tvb, offset, 1, FALSE);
 886                 proto_tree_add_item(block_tree, hf_mtrace_q_s, tvb, offset, 1, FALSE);
 887                 proto_tree_add_item(block_tree, hf_mtrace_q_src_mask, tvb, offset, 1, FALSE);
 888                 offset += 1;
 889
 890                 /* Forwarding information/error code */
 891                 proto_tree_add_item(block_tree, hf_mtrace_q_fwd_code, tvb, offset, 1, FALSE);
 892                 offset += 1;
 893         }
 894
 895
 896         return offset;
 897 }
 898
 899 static void
 900 dissect_igmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 901 {
 902         proto_tree *tree;
 903         proto_item *item;
 904         int offset = 0;
 905         unsigned char type;
 906         guint32 dst;
 907
 908         item = proto_tree_add_item(parent_tree, proto_igmp, tvb, offset, -1, FALSE);
 909         tree = proto_item_add_subtree(item, ett_igmp);
 910
 911
 912         col_set_str(pinfo->cinfo, COL_PROTOCOL, "IGMP");
 913         if (check_col(pinfo->cinfo, COL_INFO)) {
 914                 col_clear(pinfo->cinfo, COL_INFO);
 915         }
 916
 917
 918         type = tvb_get_guint8(tvb, offset);
 919
 920
 921         /* version 0 */
 922         if ((type&0xf0)==0){
 923                 offset = dissect_igmp_v0(tvb, pinfo, tree, type, offset);
 924         }
 925
 926
 927         switch (type) {
 928
 929         case IGMP_V1_HOST_MEMBERSHIP_QUERY:     /* 0x11 v1/v2/v3 */
 930                 if ( (pinfo->iplen-pinfo->iphdrlen)>=12 ) {
 931                         /* version 3 */
 932                         offset = dissect_igmp_v3_query(tvb, pinfo, tree, type, offset);
 933                 } else {
 934                         /* v1 and v2 differs in second byte of header */
 935                         if (tvb_get_guint8(tvb, offset+1)) {
 936                                 offset = dissect_igmp_v2(tvb, pinfo, tree, type, offset);
 937                         } else {
 938                                 offset = dissect_igmp_v1(tvb, pinfo, tree, type, offset);
 939                         }
 940                 }
 941                 break;
 942
 943         case IGMP_V1_HOST_MEMBERSHIP_REPORT:    /* 0x12  v1 only */
 944                 offset = dissect_igmp_v1(tvb, pinfo, tree, type, offset);
 945                 break;
 946
 947         case IGMP_DVMRP:
 948                 offset = dissect_dvmrp(tvb, pinfo, parent_tree, offset);
 949                 break;
 950
 951         case IGMP_V1_PIM_ROUTING_MESSAGE:
 952                 offset = dissect_pimv1(tvb, pinfo, parent_tree, offset);
 953                 break;
 954
 955         case IGMP_V2_MEMBERSHIP_REPORT:
 956         case IGMP_V2_LEAVE_GROUP:
 957                 offset = dissect_igmp_v2(tvb, pinfo, tree, type, offset);
 958                 break;
 959
 960         case IGMP_TRACEROUTE_RESPONSE:
 961         case IGMP_TRACEROUTE_QUERY_REQ:
 962                 offset = dissect_igmp_mtrace(tvb, pinfo, tree, type, offset);
 963                 break;
 964
 965         case IGMP_V3_MEMBERSHIP_REPORT:
 966                 offset = dissect_igmp_v3_report(tvb, pinfo, tree, type, offset);
 967                 break;
 968
 969         case IGMP_TYPE_0x23:
 970                 dst = g_htonl(MC_ALL_IGMPV3_ROUTERS);
 971                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
 972                         offset = dissect_msnip(tvb, pinfo, parent_tree, offset);
 973                 }
 974                 break;
 975
 976         case IGMP_TYPE_0x24:
 977                 dst = g_htonl(MC_ALL_ROUTERS);
 978                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
 979                         offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset);
 980                 }
 981                 dst = g_htonl(MC_ALL_IGMPV3_ROUTERS);
 982                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
 983                         offset = dissect_msnip(tvb, pinfo, parent_tree, offset);
 984                 }
 985                 break;
 986
 987         case IGMP_TYPE_0x25:
 988                 if ( (pinfo->iplen-pinfo->iphdrlen)>=8 ) {
 989                         /* if len of igmp packet>=8 we assume it is MSNIP */
 990                         offset = dissect_msnip(tvb, pinfo, parent_tree, offset);
 991                 } else {
 992                         /* ok its not MSNIP, check if it might be MRDISC */
 993                         dst = g_htonl(MC_ALL_ROUTERS);
 994                         if (!memcmp(pinfo->dst.data, &dst, 4)) {
 995                                 offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset);
 996                         }
 997                 }
 998                 break;
 999
1000         case IGMP_TYPE_0x26:
1001                 dst = g_htonl(MC_ALL_ROUTERS);
1002                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
1003                         offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset);
1004                 }
1005                 break;
1006
1007         case IGMP_IGAP_JOIN:
1008         case IGMP_IGAP_QUERY:
1009         case IGMP_IGAP_LEAVE:
1010                 offset = dissect_igap(tvb, pinfo, parent_tree, offset);
1011                 break;
1012
1013         case IGMP_RGMP_HELLO:
1014         case IGMP_RGMP_BYE:
1015         case IGMP_RGMP_JOIN:
1016         case IGMP_RGMP_LEAVE:
1017                 dst = g_htonl(MC_RGMP);
1018                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
1019                         offset = dissect_rgmp(tvb, pinfo, parent_tree, offset);
1020                 }
1021                 break;
1022
1023         default:
1024                 offset = dissect_igmp_unknown(tvb, pinfo, tree, type, offset);
1025                 break;
1026         }
1027
1028
1029         proto_item_set_len(item, offset);
1030 }
1031
1032 void
1033 proto_register_igmp(void)
1034 {
1035         static hf_register_info hf[] = {
1036                 { &hf_type,
1037                         { "Type", "igmp.type", FT_UINT8, BASE_HEX,
1038                           VALS(commands), 0, "IGMP Packet Type", HFILL }},
1039
1040                 { &hf_version,
1041                         { "IGMP Version", "igmp.version", FT_UINT8, BASE_DEC,
1042                           NULL, 0, NULL, HFILL }},
1043
1044                 { &hf_group_type,
1045                         { "Type Of Group", "igmp.group_type", FT_UINT8, BASE_DEC,
1046                           VALS(vs_group_type), 0, "IGMP V0 Type Of Group", HFILL }},
1047
1048                 { &hf_reply_code,
1049                         { "Reply", "igmp.reply", FT_UINT8, BASE_DEC,
1050                           VALS(vs_reply_code), 0, "IGMP V0 Reply", HFILL }},
1051
1052                 { &hf_reply_pending,
1053                         { "Reply Pending", "igmp.reply.pending", FT_UINT8, BASE_DEC,
1054                           NULL, 0, "IGMP V0 Reply Pending, Retry in this many seconds", HFILL }},
1055
1056                 { &hf_checksum,
1057                         { "Checksum", "igmp.checksum", FT_UINT16, BASE_HEX,
1058                           NULL, 0, "IGMP Checksum", HFILL }},
1059
1060                 { &hf_checksum_bad,
1061                         { "Bad Checksum", "igmp.checksum_bad", FT_BOOLEAN, BASE_NONE,
1062                           NULL, 0x0, "Bad IGMP Checksum", HFILL }},
1063
1064                 { &hf_identifier,
1065                         { "Identifier", "igmp.identifier", FT_UINT32, BASE_DEC,
1066                           NULL, 0, "IGMP V0 Identifier", HFILL }},
1067
1068                 { &hf_access_key,
1069                         { "Access Key", "igmp.access_key", FT_BYTES, BASE_NONE,
1070                           NULL, 0, "IGMP V0 Access Key", HFILL }},
1071
1072                 { &hf_max_resp,
1073                         { "Max Resp Time", "igmp.max_resp", FT_UINT8, BASE_DEC,
1074                           NULL, 0, "Max Response Time", HFILL }},
1075
1076                 { &hf_suppress,
1077                         { "S", "igmp.s", FT_BOOLEAN, 8,
1078                           TFS(&tfs_s), IGMP_V3_S, "Suppress Router Side Processing", HFILL }},
1079
1080                 { &hf_qrv,
1081                         { "QRV", "igmp.qrv", FT_UINT8, BASE_DEC,
1082                         NULL, IGMP_V3_QRV_MASK, "Querier's Robustness Value", HFILL }},
1083
1084                 { &hf_qqic,
1085                         { "QQIC", "igmp.qqic", FT_UINT8, BASE_DEC,
1086                           NULL, 0, "Querier's Query Interval Code", HFILL }},
1087
1088                 { &hf_num_src,
1089                         { "Num Src", "igmp.num_src", FT_UINT16, BASE_DEC,
1090                           NULL, 0, "Number Of Sources", HFILL }},
1091
1092                 { &hf_saddr,
1093                         { "Source Address", "igmp.saddr", FT_IPv4, BASE_NONE,
1094                           NULL, 0, NULL, HFILL }},
1095
1096                 { &hf_num_grp_recs,
1097                         { "Num Group Records", "igmp.num_grp_recs", FT_UINT16, BASE_DEC,
1098                           NULL, 0, "Number Of Group Records", HFILL }},
1099
1100                 { &hf_record_type,
1101                         { "Record Type", "igmp.record_type", FT_UINT8, BASE_DEC,
1102                         VALS(vs_record_type), 0, NULL, HFILL }},
1103
1104                 { &hf_aux_data_len,
1105                         { "Aux Data Len", "igmp.aux_data_len", FT_UINT8, BASE_DEC,
1106                         NULL, 0, "Aux Data Len, In units of 32bit words", HFILL }},
1107
1108                 { &hf_maddr,
1109                         { "Multicast Address", "igmp.maddr", FT_IPv4, BASE_NONE,
1110                           NULL, 0, NULL, HFILL }},
1111
1112                 { &hf_aux_data,
1113                         { "Aux Data", "igmp.aux_data", FT_BYTES, BASE_NONE,
1114                           NULL, 0, "IGMP V3 Auxiliary Data", HFILL }},
1115
1116                 { &hf_max_resp_exp,
1117                         { "Exponent", "igmp.max_resp.exp", FT_UINT8, BASE_HEX,
1118                         NULL, IGMP_MAX_RESP_EXP, "Maximum Response Time, Exponent", HFILL }},
1119
1120                 { &hf_max_resp_mant,
1121                         { "Mantissa", "igmp.max_resp.mant", FT_UINT8, BASE_HEX,
1122                         NULL, IGMP_MAX_RESP_MANT, "Maximum Response Time, Mantissa", HFILL }},
1123
1124                 { &hf_mtrace_max_hops,
1125                         { "# hops", "igmp.mtrace.max_hops", FT_UINT8, BASE_DEC,
1126                         NULL, 0, "Maximum Number of Hops to Trace", HFILL }},
1127
1128                 { &hf_mtrace_saddr,
1129                         { "Source Address", "igmp.mtrace.saddr", FT_IPv4, BASE_NONE,
1130                           NULL, 0, "Multicast Source for the Path Being Traced", HFILL }},
1131
1132                 { &hf_mtrace_raddr,
1133                         { "Receiver Address", "igmp.mtrace.raddr", FT_IPv4, BASE_NONE,
1134                           NULL, 0, "Multicast Receiver for the Path Being Traced", HFILL }},
1135
1136                 { &hf_mtrace_rspaddr,
1137                         { "Response Address", "igmp.mtrace.rspaddr", FT_IPv4, BASE_NONE,
1138                           NULL, 0, "Destination of Completed Traceroute Response", HFILL }},
1139
1140                 { &hf_mtrace_resp_ttl,
1141                         { "Response TTL", "igmp.mtrace.resp_ttl", FT_UINT8, BASE_DEC,
1142                         NULL, 0, "TTL for Multicasted Responses", HFILL }},
1143
1144                 { &hf_mtrace_q_id,
1145                         { "Query ID", "igmp.mtrace.q_id", FT_UINT24, BASE_DEC,
1146                         NULL, 0, "Identifier for this Traceroute Request", HFILL }},
1147
1148                 { &hf_mtrace_q_arrival,
1149                         { "Query Arrival", "igmp.mtrace.q_arrival", FT_UINT32, BASE_DEC,
1150                         NULL, 0, "Query Arrival Time", HFILL }},
1151
1152                 { &hf_mtrace_q_inaddr,
1153                         { "In itf addr", "igmp.mtrace.q_inaddr", FT_IPv4, BASE_NONE,
1154                         NULL, 0, "Incoming Interface Address", HFILL }},
1155
1156                 { &hf_mtrace_q_outaddr,
1157                         { "Out itf addr", "igmp.mtrace.q_outaddr", FT_IPv4, BASE_NONE,
1158                         NULL, 0, "Outgoing Interface Address", HFILL }},
1159
1160                 { &hf_mtrace_q_prevrtr,
1161                         { "Previous rtr addr", "igmp.mtrace.q_prevrtr", FT_IPv4, BASE_NONE,
1162                         NULL, 0, "Previous-Hop Router Address", HFILL }},
1163
1164                 { &hf_mtrace_q_inpkt,
1165                         { "In pkts", "igmp.mtrace.q_inpkt", FT_UINT32, BASE_DEC,
1166                         NULL, 0, "Input packet count on incoming interface", HFILL }},
1167
1168                 { &hf_mtrace_q_outpkt,
1169                         { "Out pkts", "igmp.mtrace.q_outpkt", FT_UINT32, BASE_DEC,
1170                         NULL, 0, "Output packet count on outgoing interface", HFILL }},
1171
1172                 { &hf_mtrace_q_total,
1173                         { "S,G pkt count", "igmp.mtrace.q_total", FT_UINT32, BASE_DEC,
1174                         NULL, 0, "Total number of packets for this source-group pair", HFILL }},
1175
1176                 { &hf_mtrace_q_rtg_proto,
1177                         { "Rtg Protocol", "igmp.mtrace.q_rtg_proto", FT_UINT8, BASE_DEC,
1178                         VALS(&mtrace_rtg_vals), 0, "Routing protocol between this and previous hop rtr", HFILL }},
1179
1180                 { &hf_mtrace_q_fwd_ttl,
1181                         { "FwdTTL", "igmp.mtrace.q_fwd_ttl", FT_UINT8, BASE_DEC,
1182                         NULL, 0, "TTL required for forwarding", HFILL }},
1183
1184                 { &hf_mtrace_q_mbz,
1185                         { "MBZ", "igmp.mtrace.q_mbz", FT_UINT8, BASE_HEX,
1186                         NULL, 0x80, "Must be zeroed on transmission and ignored on reception", HFILL }},
1187
1188                 { &hf_mtrace_q_s,
1189                         { "S", "igmp.mtrace.q_s", FT_UINT8, BASE_HEX,
1190                         NULL, 0x40, "Set if S,G packet count is for source network", HFILL }},
1191
1192                 { &hf_mtrace_q_src_mask,
1193                         { "Src Mask", "igmp.mtrace.q_src_mask", FT_UINT8, BASE_HEX,
1194                         NULL, 0x3F, "Source mask length. 63 when forwarding on group state", HFILL }},
1195
1196                 { &hf_mtrace_q_fwd_code,
1197                         { "Forwarding Code", "igmp.mtrace.q_fwd_code", FT_UINT8, BASE_HEX,
1198                         VALS(&mtrace_fwd_code_vals), 0, "Forwarding information/error code", HFILL }},
1199
1200         };
1201         static gint *ett[] = {
1202                 &ett_igmp,
1203                 &ett_group_record,
1204                 &ett_sqrv_bits,
1205                 &ett_max_resp,
1206                 &ett_mtrace_block,
1207         };
1208
1209         proto_igmp = proto_register_protocol("Internet Group Management Protocol",
1210             "IGMP", "igmp");
1211         proto_register_field_array(proto_igmp, hf, array_length(hf));
1212         proto_register_subtree_array(ett, array_length(ett));
1213 }
1214
1215 void
1216 proto_reg_handoff_igmp(void)
1217 {
1218         dissector_handle_t igmp_handle;
1219
1220         igmp_handle = create_dissector_handle(dissect_igmp, proto_igmp);
1221         dissector_add("ip.proto", IP_PROTO_IGMP, igmp_handle);
1222 }