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  * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  24  */
  25 /*
  26         IGMP is defined in the following RFCs
  27         RFC988  Version 0       Obsolete
  28         RFC1054 Version 1
  29         RFC1112 Version 1       (same as RFC1054 as far as we are concerned)
  30         RFC2236 Version 2
  31         RFC3376 Version 3
  32
  33         Size in bytes for each packet
  34         type    RFC988  RFC1054 RFC2236 RFC3376  DVMRP  MRDISC  MSNIP  IGAP  RGMP
  35                 v0      v1      v2      v3       v1/v3
  36         0x01      20
  37         0x02      20
  38         0x03      20
  39         0x04      20
  40         0x05      20
  41         0x06      20
  42         0x07      20
  43         0x08      20
  44         0x11               8*     8*     >=12
  45         0x12               8*     8*
  46         0x13                                     x
  47         0x16                      8
  48         0x17                      8
  49         0x22                            >=8
  50         0x23                                                    >=8b
  51         0x24                                            >=8a    8b
  52         0x25                                            4a      >=8b
  53         0x26                                            4a
  54         0x40                                                           ??c
  55         0x41                                                           ??c
  56         0x42                                                           ??c
  57         0xfc                                                                  8
  58         0xfd                                                                  8
  59         0xfe                                                                  8
  60         0xff                                                                  8
  61
  62    * Differs in second byte of protocol. Always 0 in V1
  63
  64
  65         Multicast traceroute was taken from
  66         draft-ietf-idmr-traceroute-ipm-07.txt
  67
  68         Size in bytes for each packet
  69         type    draft-ietf-idmr-traceroute-ipm-07.ps
  70         0x1e      24 + n*32
  71         0x1f      24 + n*32 (n == 0 for Query)
  72
  73    x DVMRP Protocol  see packet-dvmrp.c
  74
  75         DVMRP is defined in the following RFCs
  76         RFC1075 Version 1
  77         draft-ietf-idmr-dvmrp-v3-10.txt Version 3
  78
  79         V1 and V3 can be distinguished by looking at bytes 6 and 7 in the
  80         IGMP header.
  81         If header[6]==0xff and header[7]==0x03 we have version 3.
  82
  83    a MRDISC Protocol  see packet-mrdisc.c
  84
  85         MRDISC : IGMP Multicast Router DISCovery
  86         draft-ietf-idmr-igmp-mrdisc-06.txt
  87         TTL == 1 and IP.DST==224.0.0.2 for all packets
  88
  89    b MSNIP Protocol  see packet-msnip.c
  90
  91         MSNIP : Multicast Source Notification of Interest Protocol
  92         draft-ietf-idmr-msnip-00.txt
  93         0x23, 0x24 are sent with ip.dst==224.0.0.22
  94         0x25 is sent as unicast.
  95
  96    c IGAP Protocol  see packet-igap.c
  97
  98         IGAP : Internet Group membership Authentication Protocol
  99         draft-hayashi-igap-03.txt
 100
 101    d RGMP Protocol  see packet-rgmp.c
 102
 103         RGMP : Router-port Group Management Protocol
 104         RFC3488
 105         TTL == 1 and IP.DST==224.0.0.25 for all packets
 106
 107 */
 108
 109 #include "config.h"
 110
 111 #include <string.h>
 112 #include <glib.h>
 113
 114 #include <epan/packet.h>
 115 #include <epan/to_str.h>
 116 #include <epan/ipproto.h>
 117 #include <epan/in_cksum.h>
 118 #include "packet-igmp.h"
 119 #include "packet-dvmrp.h"
 120 #include "packet-pim.h"
 121 #include "packet-mrdisc.h"
 122 #include "packet-msnip.h"
 123 #include "packet-igap.h"
 124 #include "packet-rgmp.h"
 125
 126 void proto_register_igmp(void);
 127 void proto_reg_handoff_igmp(void);
 128
 129 static int proto_igmp = -1;
 130 static int hf_type = -1;
 131 static int hf_version = -1;
 132 static int hf_group_type = -1;
 133 static int hf_reply_code = -1;
 134 static int hf_reply_pending = -1;
 135 static int hf_checksum = -1;
 136 static int hf_checksum_bad = -1;
 137 static int hf_identifier = -1;
 138 static int hf_access_key = -1;
 139 static int hf_max_resp = -1;
 140 static int hf_max_resp_exp = -1;
 141 static int hf_max_resp_mant = -1;
 142 static int hf_suppress = -1;
 143 static int hf_qrv = -1;
 144 static int hf_qqic = -1;
 145 static int hf_num_src = -1;
 146 static int hf_saddr = -1;
 147 static int hf_num_grp_recs = -1;
 148 static int hf_record_type = -1;
 149 static int hf_aux_data_len = -1;
 150 static int hf_maddr = -1;
 151 static int hf_aux_data = -1;
 152 static int hf_mtrace_max_hops = -1;
 153 static int hf_mtrace_saddr = -1;
 154 static int hf_mtrace_raddr = -1;
 155 static int hf_mtrace_rspaddr = -1;
 156 static int hf_mtrace_resp_ttl = -1;
 157 static int hf_mtrace_q_id = -1;
 158 static int hf_mtrace_q_arrival = -1;
 159 static int hf_mtrace_q_inaddr = -1;
 160 static int hf_mtrace_q_outaddr = -1;
 161 static int hf_mtrace_q_prevrtr = -1;
 162 static int hf_mtrace_q_inpkt = -1;
 163 static int hf_mtrace_q_outpkt = -1;
 164 static int hf_mtrace_q_total = -1;
 165 static int hf_mtrace_q_rtg_proto = -1;
 166 static int hf_mtrace_q_fwd_ttl = -1;
 167 static int hf_mtrace_q_mbz = -1;
 168 static int hf_mtrace_q_s = -1;
 169 static int hf_mtrace_q_src_mask = -1;
 170 static int hf_mtrace_q_fwd_code = -1;
 171
 172 static int ett_igmp = -1;
 173 static int ett_group_record = -1;
 174 static int ett_sqrv_bits = -1;
 175 static int ett_max_resp = -1;
 176 static int ett_mtrace_block = -1;
 177
 178 #define MC_ALL_ROUTERS          0xe0000002
 179 #define MC_ALL_IGMPV3_ROUTERS   0xe0000016
 180 #define MC_RGMP                 0xe0000019
 181
 182
 183 #define IGMP_V0_CREATE_GROUP_REQUEST    0x01
 184 #define IGMP_V0_CREATE_GROUP_REPLY      0x02
 185 #define IGMP_V0_JOIN_GROUP_REQUEST      0x03
 186 #define IGMP_V0_JOIN_GROUP_REPLY        0x04
 187 #define IGMP_V0_LEAVE_GROUP_REQUEST     0x05
 188 #define IGMP_V0_LEAVE_GROUP_REPLY       0x06
 189 #define IGMP_V0_CONFIRM_GROUP_REQUEST   0x07
 190 #define IGMP_V0_CONFIRM_GROUP_REPLY     0x08
 191 #define IGMP_V1_HOST_MEMBERSHIP_QUERY   0x11
 192 #define IGMP_V1_HOST_MEMBERSHIP_REPORT  0x12
 193 #define IGMP_DVMRP                      0x13
 194 #define IGMP_V1_PIM_ROUTING_MESSAGE     0x14
 195 #define IGMP_V2_MEMBERSHIP_REPORT       0x16
 196 #define IGMP_V2_LEAVE_GROUP             0x17
 197 #define IGMP_TRACEROUTE_RESPONSE        0x1e
 198 #define IGMP_TRACEROUTE_QUERY_REQ       0x1f
 199 #define IGMP_V3_MEMBERSHIP_REPORT       0x22
 200 #define IGMP_TYPE_0x23                  0x23
 201 #define IGMP_TYPE_0x24                  0x24
 202 #define IGMP_TYPE_0x25                  0x25
 203 #define IGMP_TYPE_0x26                  0x26
 204
 205 #define IGMP_TRACEROUTE_HDR_LEN           24
 206 #define IGMP_TRACEROUTE_RSP_LEN           32
 207
 208 static const value_string commands[] = {
 209         {IGMP_V0_CREATE_GROUP_REQUEST,  "Create Group Request"          },
 210         {IGMP_V0_CREATE_GROUP_REPLY,    "Create Group Reply"            },
 211         {IGMP_V0_JOIN_GROUP_REQUEST,    "Join Group Request"            },
 212         {IGMP_V0_JOIN_GROUP_REPLY,      "Join Group Reply"              },
 213         {IGMP_V0_LEAVE_GROUP_REQUEST,   "Leave Group Request"           },
 214         {IGMP_V0_LEAVE_GROUP_REPLY,     "Leave Group Reply"             },
 215         {IGMP_V0_CONFIRM_GROUP_REQUEST, "Confirm Group Request"         },
 216         {IGMP_V0_CONFIRM_GROUP_REPLY,   "Confirm Group Reply"           },
 217         {IGMP_V1_HOST_MEMBERSHIP_QUERY, "Membership Query"              },
 218         {IGMP_V1_HOST_MEMBERSHIP_REPORT,"Membership Report"             },
 219         {IGMP_DVMRP,                    "DVMRP Protocol"                },
 220         {IGMP_V1_PIM_ROUTING_MESSAGE,   "PIM Routing Message"           },
 221         {IGMP_V2_MEMBERSHIP_REPORT,     "Membership Report"             },
 222         {IGMP_V2_LEAVE_GROUP,           "Leave Group"                   },
 223         {IGMP_TRACEROUTE_RESPONSE,      "Traceroute Response"           },
 224         {IGMP_TRACEROUTE_QUERY_REQ,     "Traceroute Query or Request"   },
 225         {IGMP_V3_MEMBERSHIP_REPORT,     "Membership Report"             },
 226         {0,             NULL}
 227 };
 228
 229 #define IGMP_V3_S               0x08
 230 #define IGMP_V3_QRV_MASK        0x07
 231
 232 #define IGMP_MAX_RESP_EXP       0x70
 233 #define IGMP_MAX_RESP_MANT      0x0f
 234
 235 #define IGMP_V0_GROUP_PUBLIC    0x00
 236 #define IGMP_V0_GROUP_PRIVATE   0x01
 237
 238 static const value_string vs_group_type[] = {
 239         {IGMP_V0_GROUP_PUBLIC,          "Public Group"                  },
 240         {IGMP_V0_GROUP_PRIVATE,         "Private Group"                 },
 241         {0,             NULL}
 242 };
 243
 244 #define IGMP_V0_REPLY_GRANTED   0x00
 245 #define IGMP_V0_REPLY_NO_RESOURCES      0x01
 246 #define IGMP_V0_REPLY_INVALID_CODE      0x02
 247 #define IGMP_V0_REPLY_INVALID_GROUP     0x03
 248 #define IGMP_V0_REPLY_INVALID_KEY       0x04
 249
 250 static const value_string vs_reply_code[] = {
 251         {IGMP_V0_REPLY_GRANTED, "Request Granted"       },
 252         {IGMP_V0_REPLY_NO_RESOURCES,    "Request Denied, No Resources"  },
 253         {IGMP_V0_REPLY_INVALID_CODE,    "Request Denied, Invalid Code"  },
 254         {IGMP_V0_REPLY_INVALID_GROUP,   "Request Denied, Invalid Group" },
 255         {IGMP_V0_REPLY_INVALID_KEY,     "Request Denied, Invalid Key"   },
 256         {0,             NULL}
 257 };
 258
 259 static const true_false_string tfs_s = {
 260         "SUPPRESS router side processing",
 261         "Do not suppress router side processing"
 262 };
 263
 264 #define IGMP_V3_MODE_IS_INCLUDE         1
 265 #define IGMP_V3_MODE_IS_EXCLUDE         2
 266 #define IGMP_V3_CHANGE_TO_INCLUDE_MODE  3
 267 #define IGMP_V3_CHANGE_TO_EXCLUDE_MODE  4
 268 #define IGMP_V3_ALLOW_NEW_SOURCES       5
 269 #define IGMP_V3_BLOCK_OLD_SOURCES       6
 270
 271 static const value_string vs_record_type[] = {
 272         {IGMP_V3_MODE_IS_INCLUDE,       "Mode Is Include"               },
 273         {IGMP_V3_MODE_IS_EXCLUDE,       "Mode Is Exclude"               },
 274         {IGMP_V3_CHANGE_TO_INCLUDE_MODE,"Change To Include Mode"        },
 275         {IGMP_V3_CHANGE_TO_EXCLUDE_MODE,"Change To Exclude Mode"        },
 276         {IGMP_V3_ALLOW_NEW_SOURCES,     "Allow New Sources"             },
 277         {IGMP_V3_BLOCK_OLD_SOURCES,     "Block Old Sources"             },
 278         { 0,    NULL}
 279 };
 280
 281 static const value_string mtrace_rtg_vals[] = {
 282         {1,  "DVMRP"                                        },
 283         {2,  "MOSPF"                                        },
 284         {3,  "PIM"                                          },
 285         {4,  "CBT"                                          },
 286         {5,  "PIM using special routing table"              },
 287         {6,  "PIM using a static route"                     },
 288         {7,  "DVMRP using a static route"                   },
 289         {8,  "PIM using MBGP (aka BGP4+) route"             },
 290         {9,  "CBT using special routing table"              },
 291         {10, "CBT using a static route"                     },
 292         {11, "PIM using state created by Assert processing" },
 293         {0,  NULL}
 294 };
 295
 296 static const value_string mtrace_fwd_code_vals[] = {
 297         {0x00, "NO_ERROR"       },
 298         {0x01, "WRONG_IF"       },
 299         {0x02, "PRUNE_SENT"     },
 300         {0x03, "PRUNE_RCVD"     },
 301         {0x04, "SCOPED"         },
 302         {0x05, "NO_ROUTE"       },
 303         {0x06, "WRONG_LAST_HOP" },
 304         {0x07, "NOT_FORWARDING" },
 305         {0x08, "REACHED_RP"     },
 306         {0x09, "RPF_IF"         },
 307         {0x0A, "NO_MULTICAST"   },
 308         {0x0B, "INFO_HIDDEN"    },
 309         {0x81, "NO_SPACE"       },
 310         {0x82, "OLD_ROUTER"     },
 311         {0x83, "ADMIN_PROHIB"   },
 312         {0, NULL}
 313 };
 314
 315 #define PRINT_IGMP_VERSION(version)                                     \
 316         do {                                                            \
 317                 proto_item *ti;                                         \
 318                 col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "IGMPv%d",version);    \
 319                 col_add_fstr(pinfo->cinfo, COL_INFO,            \
 320                         "%s",val_to_str(type, commands, "Unknown Type:0x%02x"));        \
 321                 /* version of IGMP protocol */                          \
 322                 ti = proto_tree_add_uint(tree, hf_version, tvb, 0, 0, version); \
 323                 PROTO_ITEM_SET_GENERATED(ti);                           \
 324                 /* type of command */                                   \
 325                 proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);\
 326                 offset += 1;                                            \
 327         } while (0);
 328
 329 void igmp_checksum(proto_tree *tree, tvbuff_t *tvb, int hf_index,
 330         int hf_index_bad, packet_info *pinfo, guint len)
 331 {
 332         guint16 cksum, hdrcksum;
 333         vec_t cksum_vec[1];
 334         proto_item *hidden_item;
 335
 336         if (len == 0) {
 337                 /*
 338                  * Checksum the entire IGMP packet.
 339                  */
 340                 len = tvb_reported_length(tvb);
 341         }
 342
 343         hdrcksum = tvb_get_ntohs(tvb, 2);
 344         if (!pinfo->fragmented && tvb_length(tvb) >= len) {
 345                 /*
 346                  * The packet isn't part of a fragmented datagram and isn't
 347                  * truncated, so we can checksum it.
 348                  */
 349                 cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, len);
 350                 cksum_vec[0].len = len;
 351
 352                 cksum = in_cksum(&cksum_vec[0],1);
 353
 354                 if (cksum == 0) {
 355                         proto_tree_add_uint_format(tree, hf_index, 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, tvb, 2, 2, hdrcksum,
 362                                 "Header checksum: 0x%04x [incorrect, should be 0x%04x]",
 363                                 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         col_add_str(pinfo->cinfo, COL_INFO,
 379                 val_to_str(type, commands, "Unknown Type:0x%02x"));
 380
 381         /* type of command */
 382         proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
 383         offset += 1;
 384
 385         /* Just call the rest of it "data" */
 386         len = tvb_length_remaining(tvb, offset);
 387         proto_tree_add_text(tree, tvb, offset, len, "Data");
 388         offset += len;
 389
 390         return offset;
 391 }
 392
 393
 394
 395 /*************************************************************
 396  * IGMP Protocol dissectors
 397  *************************************************************/
 398 static int
 399 dissect_v3_max_resp(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 400 {
 401         proto_tree *tree;
 402         proto_item *item;
 403         guint8 bits;
 404         guint32 tsecs;
 405
 406         bits = tvb_get_guint8(tvb, offset);
 407         if (bits&0x80) {
 408                 tsecs = ((bits&IGMP_MAX_RESP_MANT)|0x10);
 409                 tsecs = tsecs << ( ((bits&IGMP_MAX_RESP_EXP)>>4) + 3);
 410         } else {
 411                 tsecs = bits;
 412         }
 413
 414         item = proto_tree_add_uint_format_value(parent_tree, hf_max_resp, tvb,
 415                         offset, 1, tsecs, "%.1f sec (0x%02x)",tsecs*0.1,bits);
 416
 417         if (bits&0x80) {
 418                 tree = proto_item_add_subtree(item, ett_max_resp);
 419
 420                 proto_tree_add_uint(tree, hf_max_resp_exp, tvb, offset, 1,
 421                         bits);
 422                 proto_tree_add_uint(tree, hf_max_resp_mant, tvb, offset, 1,
 423                         bits);
 424         }
 425
 426         offset += 1;
 427
 428         return offset;
 429 }
 430
 431 static int
 432 dissect_v3_sqrv_bits(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 433 {
 434         proto_tree *tree;
 435         proto_item *item;
 436         guint8 bits;
 437
 438         bits = tvb_get_guint8(tvb, offset);
 439
 440         item = proto_tree_add_text(parent_tree, tvb, offset, 1,
 441                 "QRV=%d S=%s", bits&IGMP_V3_QRV_MASK,
 442                         (bits&IGMP_V3_S)?tfs_s.true_string:tfs_s.false_string);
 443         tree = proto_item_add_subtree(item, ett_sqrv_bits);
 444
 445         /* S flag */
 446         proto_tree_add_boolean(tree, hf_suppress, tvb, offset, 1, bits);
 447         /* QRV */
 448         proto_tree_add_uint(tree, hf_qrv, tvb, offset, 1, bits);
 449         offset += 1;
 450
 451         return offset;
 452 }
 453
 454 static int
 455 dissect_v3_group_record(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
 456 {
 457         proto_tree *tree;
 458         proto_item *item;
 459         int old_offset = offset;
 460         guint8  adl;
 461         guint16 num;
 462         guint32 ip;
 463         guint32 maddr;
 464         guint8 record_type;
 465
 466         ip = tvb_get_ipv4(tvb, offset+4);
 467         item = proto_tree_add_text(parent_tree, tvb, offset, -1,
 468                 "Group Record : %s  %s",
 469                         ip_to_str((guint8*)&ip),
 470                         val_to_str_const(tvb_get_guint8(tvb, offset), vs_record_type,"")
 471                 );
 472         tree = proto_item_add_subtree(item, ett_group_record);
 473
 474         /* record type */
 475         record_type = tvb_get_guint8(tvb, offset);
 476         proto_tree_add_item(tree, hf_record_type, tvb, offset, 1, ENC_BIG_ENDIAN);
 477         offset += 1;
 478
 479         /* aux data len */
 480         adl = tvb_get_guint8(tvb, offset);
 481         proto_tree_add_uint(tree, hf_aux_data_len, tvb, offset, 1, adl);
 482         offset += 1;
 483
 484         /*number of sources*/
 485         num = tvb_get_ntohs(tvb, offset);
 486         proto_tree_add_uint(tree, hf_num_src, tvb, offset, 2, num);
 487         offset += 2;
 488
 489         /* multicast address */
 490         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 491         maddr = tvb_get_ipv4(tvb, offset);
 492         offset += 4;
 493
 494         if (num == 0) {
 495                 switch(record_type) {
 496                 case IGMP_V3_MODE_IS_INCLUDE:
 497                 case IGMP_V3_CHANGE_TO_INCLUDE_MODE:
 498                         col_append_fstr(pinfo->cinfo, COL_INFO, " / Leave group %s",
 499                                 ip_to_str((guint8*)&maddr));
 500                         break;
 501                 case IGMP_V3_MODE_IS_EXCLUDE:
 502                 case IGMP_V3_CHANGE_TO_EXCLUDE_MODE:
 503                         col_append_fstr(pinfo->cinfo, COL_INFO,
 504                                 " / Join group %s for any sources", ip_to_str((guint8*)&maddr));
 505                         break;
 506                 case IGMP_V3_ALLOW_NEW_SOURCES:
 507                         col_append_fstr(pinfo->cinfo, COL_INFO,
 508                                 " / Group %s, ALLOW_NEW_SOURCES but no source specified (?)",
 509                                 ip_to_str((guint8*)&maddr));
 510                         break;
 511                 case IGMP_V3_BLOCK_OLD_SOURCES:
 512                         col_append_fstr(pinfo->cinfo, COL_INFO,
 513                                 " / Group %s, BLOCK_OLD_SOURCES but no source specified (?)",
 514                                 ip_to_str((guint8*)&maddr));
 515                         break;
 516                 default:
 517                         col_append_fstr(pinfo->cinfo, COL_INFO,
 518                                 " / Group %s, unknown record type (?)",
 519                                 ip_to_str((guint8*)&maddr));
 520                                 break;
 521                 }
 522         } else {
 523                 switch(record_type) {
 524                 case IGMP_V3_MODE_IS_INCLUDE:
 525                 case IGMP_V3_CHANGE_TO_INCLUDE_MODE:
 526                         col_append_fstr(pinfo->cinfo, COL_INFO,
 527                                 " / Join group %s for source%s {",
 528                                 ip_to_str((guint8*)&maddr), (num>1) ? "s in" : "");
 529                         break;
 530                 case IGMP_V3_MODE_IS_EXCLUDE:
 531                 case IGMP_V3_CHANGE_TO_EXCLUDE_MODE:
 532                         col_append_fstr(pinfo->cinfo, COL_INFO,
 533                                 " / Join group %s, for source%s {",
 534                                 ip_to_str((guint8*)&maddr), (num>1) ? "s not in" : " not");
 535                         break;
 536                 case IGMP_V3_ALLOW_NEW_SOURCES:
 537                         col_append_fstr(pinfo->cinfo, COL_INFO,
 538                                 " / Group %s, new source%s {",
 539                                 ip_to_str((guint8*)&maddr), (num>1) ? "s" : "");
 540                         break;
 541                 case IGMP_V3_BLOCK_OLD_SOURCES:
 542                         col_append_fstr(pinfo->cinfo, COL_INFO,
 543                                 " / Group %s, block source%s {",
 544                                 ip_to_str((guint8*)&maddr), (num>1) ? "s" : "");
 545                         break;
 546                 default:
 547                         col_append_fstr(pinfo->cinfo, COL_INFO,
 548                                 " / Group %s, unknown record type (?), sources {",
 549                                 ip_to_str((guint8*)&maddr));
 550                         break;
 551                 }
 552         }
 553
 554         /* source addresses */
 555         while(num--){
 556                 col_append_fstr(pinfo->cinfo, COL_INFO, "%s%s",
 557                                 tvb_ip_to_str(tvb, offset), (num?", ":"}"));
 558
 559                 proto_tree_add_item(tree, hf_saddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 560                 offset += 4;
 561         }
 562
 563         /* aux data */
 564         if(adl){
 565                 proto_tree_add_item(tree, hf_aux_data, tvb, offset, adl*4, ENC_NA);
 566                 offset += adl*4;
 567         }
 568
 569         proto_item_set_len(item, offset-old_offset);
 570         return offset;
 571 }
 572
 573 /* dissectors for version 3, rfc3376 */
 574 static int
 575 dissect_igmp_v3_report(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 576 {
 577         guint16 num;
 578
 579         PRINT_IGMP_VERSION(3);
 580
 581         /* skip reserved field*/
 582         offset += 1;
 583
 584         /* checksum */
 585         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
 586         offset += 2;
 587
 588         /* skip reserved field */
 589         offset += 2;
 590
 591         /* number of group records */
 592         num = tvb_get_ntohs(tvb, offset);
 593         if (!num)
 594                 col_append_str(pinfo->cinfo, COL_INFO, " - General query");
 595
 596         proto_tree_add_uint(tree, hf_num_grp_recs, tvb, offset, 2, num);
 597         offset += 2;
 598
 599         while (num--)
 600                 offset = dissect_v3_group_record(tvb, pinfo, tree, offset);
 601
 602         return offset;
 603 }
 604
 605 static int
 606 dissect_igmp_v3_query(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 607 {
 608         guint16 num;
 609         guint32 maddr;
 610
 611         PRINT_IGMP_VERSION(3);
 612
 613         num = tvb_get_ntohs(tvb, offset+9);
 614         /* max resp code */
 615         offset = dissect_v3_max_resp(tvb, tree, offset);
 616
 617         /* checksum */
 618         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
 619         offset += 2;
 620
 621         /* group address */
 622         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 623
 624         maddr = tvb_get_ipv4(tvb, offset);
 625         if (! maddr) {
 626                 col_append_str(pinfo->cinfo, COL_INFO, ", general");
 627         } else {
 628                 col_append_fstr(pinfo->cinfo, COL_INFO, ", specific for group %s",
 629                         ip_to_str((guint8*)&maddr));
 630         }
 631         offset +=4;
 632
 633         /* bitmask for S and QRV */
 634         offset = dissect_v3_sqrv_bits(tvb, tree, offset);
 635
 636         /* qqic */
 637         proto_tree_add_item(tree, hf_qqic, tvb, offset, 1, ENC_BIG_ENDIAN);
 638         offset += 1;
 639
 640         /*number of sources*/
 641         proto_tree_add_uint(tree, hf_num_src, tvb, offset, 2, num);
 642         if (num) {
 643                 col_append_fstr(pinfo->cinfo, COL_INFO, ", source%s {", (num>1)?"s":"");
 644         }
 645         offset += 2;
 646
 647         while(num--){
 648                 col_append_fstr(pinfo->cinfo, COL_INFO, "%s%s", tvb_ip_to_str(tvb, offset), (num?", ":"}"));
 649                 proto_tree_add_item(tree, hf_saddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 650                 offset += 4;
 651         }
 652
 653         return offset;
 654 }
 655
 656 /* dissector for version 2 query and report, rfc2236 */
 657 static int
 658 dissect_igmp_v2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 659 {
 660         guint8 tsecs;
 661         guint32 maddr;
 662
 663         PRINT_IGMP_VERSION(2);
 664
 665         /* max resp time */
 666         tsecs = tvb_get_guint8(tvb, offset);
 667         proto_tree_add_uint_format_value(tree, hf_max_resp, tvb,
 668                 offset, 1, tsecs, "%.1f sec (0x%02x)", tsecs*0.1,tsecs);
 669         offset += 1;
 670
 671         /* checksum */
 672         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 8);
 673         offset += 2;
 674
 675         /* group address */
 676         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 677
 678         maddr = tvb_get_ipv4(tvb, offset);
 679         if (! maddr) {
 680                 col_append_str(pinfo->cinfo, COL_INFO, ", general");
 681         } else {
 682                 if (type == IGMP_V2_LEAVE_GROUP) {
 683                         col_append_fstr(pinfo->cinfo, COL_INFO,
 684                                 " %s", ip_to_str((guint8*)&maddr));
 685                 } else if (type == IGMP_V1_HOST_MEMBERSHIP_QUERY) {
 686                         col_append_fstr(pinfo->cinfo, COL_INFO,
 687                         ", specific for group %s", ip_to_str((guint8*)&maddr));
 688                 } else { /* IGMP_V2_MEMBERSHIP_REPORT is the only case left */
 689                         col_append_fstr(pinfo->cinfo, COL_INFO,
 690                                 " group %s", ip_to_str((guint8*)&maddr));
 691                 }
 692         }
 693         offset +=4;
 694
 695         return offset;
 696 }
 697
 698 /* dissector for version 1 query and report, rfc1054 */
 699 static int
 700 dissect_igmp_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 701 {
 702         PRINT_IGMP_VERSION(1);
 703
 704         /* skip unused byte */
 705         offset += 1;
 706
 707         /* checksum */
 708         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 8);
 709         offset += 2;
 710
 711         /* group address */
 712         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 713         offset +=4;
 714
 715         return offset;
 716 }
 717
 718 /* dissector for version 0, rfc988 */
 719 static int
 720 dissect_igmp_v0(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 721 {
 722         unsigned char code;
 723
 724         PRINT_IGMP_VERSION(0);
 725
 726         /* Code */
 727         code = tvb_get_guint8(tvb, offset);
 728         if (type==IGMP_V0_CREATE_GROUP_REQUEST) {
 729                 proto_tree_add_uint(tree, hf_group_type, tvb, offset, 1, code);
 730         } else if (!(type&0x01)) {
 731                 if (code <5) {
 732                         proto_tree_add_uint(tree, hf_reply_code, tvb, offset, 1, code);
 733                 } else {
 734                         proto_tree_add_uint(tree, hf_reply_pending, tvb, offset, 1, code);
 735                 }
 736         }
 737         offset += 1;
 738
 739         /* checksum */
 740         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 20);
 741         offset += 2;
 742
 743         /* identifier */
 744         proto_tree_add_item(tree, hf_identifier, tvb, offset, 4, ENC_BIG_ENDIAN);
 745         offset += 4;
 746
 747         /* group address */
 748         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 749         offset += 4;
 750
 751         /* access key */
 752         proto_tree_add_item(tree, hf_access_key, tvb, offset, 8, ENC_NA);
 753         offset += 8;
 754
 755         return offset;
 756 }
 757
 758 /* dissector for multicast traceroute, rfc???? */
 759 static int
 760 dissect_igmp_mtrace(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset)
 761 {
 762         const char *typestr, *blocks = NULL;
 763         char buf[20];
 764
 765         /* All multicast traceroute packets (Query, Request and
 766          * Response) have the same fixed header. Request and Response
 767          * have one or more response data blocks following this fixed
 768          * header. Since Query and Request share the same IGMP type,
 769          * the method to differentiate between them is to check the
 770          * IGMP packet length. Queries are only
 771          * IGMP_TRACEROUTE_HDR_LEN bytes long.
 772          */
 773         if (type == IGMP_TRACEROUTE_RESPONSE) {
 774                 int i = (tvb_reported_length_remaining(tvb, offset) - IGMP_TRACEROUTE_HDR_LEN) / IGMP_TRACEROUTE_RSP_LEN;
 775                 g_snprintf(buf, sizeof buf, ", %d block%s", i, plurality(i, "", "s"));
 776                 typestr = "Traceroute Response";
 777                 blocks = buf;
 778         } else if (tvb_reported_length_remaining(tvb, offset) == IGMP_TRACEROUTE_HDR_LEN)
 779                 typestr = "Traceroute Query";
 780         else
 781                 typestr = "Traceroute Request";
 782
 783         col_set_str(pinfo->cinfo, COL_INFO, typestr);
 784         if (blocks)
 785                 col_append_str(pinfo->cinfo, COL_INFO, blocks);
 786
 787         proto_tree_add_uint_format_value(tree, hf_type, tvb, offset, 1, type,
 788                 "%s (0x%02x)", typestr, type);
 789         offset += 1;
 790
 791         /* maximum number of hops that the requester wants to trace */
 792         proto_tree_add_item(tree, hf_mtrace_max_hops, tvb, offset, 1, ENC_BIG_ENDIAN);
 793         offset += 1;
 794
 795         /* checksum */
 796         igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
 797         offset += 2;
 798
 799         /* group address to be traced */
 800         proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 801         offset += 4;
 802
 803         /* address of multicast source for the path being traced */
 804         proto_tree_add_item(tree, hf_mtrace_saddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 805         offset += 4;
 806
 807         /* address of multicast receiver for the path being traced */
 808         proto_tree_add_item(tree, hf_mtrace_raddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 809         offset += 4;
 810
 811         /* address where the completed traceroute response packet gets sent */
 812         proto_tree_add_item(tree, hf_mtrace_rspaddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 813         offset += 4;
 814
 815         /* for multicasted responses, TTL at which to multicast the response */
 816         proto_tree_add_item(tree, hf_mtrace_resp_ttl, tvb, offset, 1, ENC_BIG_ENDIAN);
 817         offset += 1;
 818
 819         /* unique identifier for this traceroute request (for e.g. duplicate/delay detection) */
 820         proto_tree_add_item(tree, hf_mtrace_q_id, tvb, offset, 3, ENC_BIG_ENDIAN);
 821         offset += 3;
 822
 823         /* If this was Query, we only had the fixed header */
 824         if (tvb_reported_length_remaining(tvb, offset) == 0)
 825                 return offset;
 826
 827         /* Loop through the response data blocks */
 828         while (tvb_reported_length_remaining(tvb, offset) >= IGMP_TRACEROUTE_RSP_LEN) {
 829                 proto_item *bi;
 830                 proto_tree *block_tree;
 831
 832                 bi = proto_tree_add_text(tree, tvb, offset, IGMP_TRACEROUTE_RSP_LEN,
 833                         "Response data block: %s -> %s,  Proto: %s,  Forwarding Code: %s",
 834                         tvb_ip_to_str(tvb, offset + 4),
 835                         tvb_ip_to_str(tvb, offset + 8),
 836                         val_to_str_const(tvb_get_guint8(tvb, offset + 28), mtrace_rtg_vals, "Unknown"),
 837                         val_to_str_const(tvb_get_guint8(tvb, offset + 31), mtrace_fwd_code_vals, "Unknown"));
 838                 block_tree = proto_item_add_subtree(bi, ett_mtrace_block);
 839
 840                 /* Query Arrival Time */
 841                 proto_tree_add_item(block_tree, hf_mtrace_q_arrival, tvb, offset, 4, ENC_BIG_ENDIAN);
 842                 offset += 4;
 843
 844                 /* Incoming Interface Address */
 845                 proto_tree_add_item(block_tree, hf_mtrace_q_inaddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 846                 offset += 4;
 847
 848                 /* Outgoing Interface Address */
 849                 proto_tree_add_item(block_tree, hf_mtrace_q_outaddr, tvb, offset, 4, ENC_BIG_ENDIAN);
 850                 offset += 4;
 851
 852                 /* Previous-Hop Router Address */
 853                 proto_tree_add_item(block_tree, hf_mtrace_q_prevrtr, tvb, offset, 4, ENC_BIG_ENDIAN);
 854                 offset += 4;
 855
 856                 /* Input packet count on incoming interface */
 857                 proto_tree_add_item(block_tree, hf_mtrace_q_inpkt, tvb, offset, 4, ENC_BIG_ENDIAN);
 858                 offset += 4;
 859
 860                 /* Output packet count on outgoing interface */
 861                 proto_tree_add_item(block_tree, hf_mtrace_q_outpkt, tvb, offset, 4, ENC_BIG_ENDIAN);
 862                 offset += 4;
 863
 864                 /* Total number of packets for this source-group pair */
 865                 proto_tree_add_item(block_tree, hf_mtrace_q_total, tvb, offset, 4, ENC_BIG_ENDIAN);
 866                 offset += 4;
 867
 868                 /* Routing protocol in use between this and previous-hop router */
 869                 proto_tree_add_item(block_tree, hf_mtrace_q_rtg_proto, tvb, offset, 1, ENC_BIG_ENDIAN);
 870                 offset += 1;
 871
 872                 /* TTL that a packet is required to be forwarded */
 873                 proto_tree_add_item(block_tree, hf_mtrace_q_fwd_ttl, tvb, offset, 1, ENC_BIG_ENDIAN);
 874                 offset += 1;
 875
 876                 /* Must be zeroed and ignored bit, S bit and src network mask length */
 877                 proto_tree_add_item(block_tree, hf_mtrace_q_mbz, tvb, offset, 1, ENC_BIG_ENDIAN);
 878                 proto_tree_add_item(block_tree, hf_mtrace_q_s, tvb, offset, 1, ENC_BIG_ENDIAN);
 879                 proto_tree_add_item(block_tree, hf_mtrace_q_src_mask, tvb, offset, 1, ENC_BIG_ENDIAN);
 880                 offset += 1;
 881
 882                 /* Forwarding information/error code */
 883                 proto_tree_add_item(block_tree, hf_mtrace_q_fwd_code, tvb, offset, 1, ENC_BIG_ENDIAN);
 884                 offset += 1;
 885         }
 886
 887         return offset;
 888 }
 889
 890 static void
 891 dissect_igmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 892 {
 893         proto_tree *tree;
 894         proto_item *item;
 895         int offset = 0;
 896         unsigned char type;
 897         guint32 dst;
 898
 899         item = proto_tree_add_item(parent_tree, proto_igmp, tvb, offset, -1, ENC_NA);
 900         tree = proto_item_add_subtree(item, ett_igmp);
 901
 902         col_set_str(pinfo->cinfo, COL_PROTOCOL, "IGMP");
 903         col_clear(pinfo->cinfo, COL_INFO);
 904
 905         type = tvb_get_guint8(tvb, offset);
 906
 907         /* version 0 */
 908         if ((type&0xf0)==0){
 909                 offset = dissect_igmp_v0(tvb, pinfo, tree, type, offset);
 910         }
 911
 912         switch (type) {
 913         case IGMP_V1_HOST_MEMBERSHIP_QUERY:     /* 0x11 v1/v2/v3 */
 914                 if ( tvb_reported_length(tvb)>=12 ) {
 915                         /* version 3 */
 916                         offset = dissect_igmp_v3_query(tvb, pinfo, tree, type, offset);
 917                 } else {
 918                         /* v1 and v2 differs in second byte of header */
 919                         if (tvb_get_guint8(tvb, offset+1)) {
 920                                 offset = dissect_igmp_v2(tvb, pinfo, tree, type, offset);
 921                         } else {
 922                                 offset = dissect_igmp_v1(tvb, pinfo, tree, type, offset);
 923                         }
 924                 }
 925                 break;
 926
 927         case IGMP_V1_HOST_MEMBERSHIP_REPORT:    /* 0x12  v1 only */
 928                 offset = dissect_igmp_v1(tvb, pinfo, tree, type, offset);
 929                 break;
 930
 931         case IGMP_DVMRP:
 932                 offset = dissect_dvmrp(tvb, pinfo, parent_tree, offset);
 933                 break;
 934
 935         case IGMP_V1_PIM_ROUTING_MESSAGE:
 936                 offset = dissect_pimv1(tvb, pinfo, parent_tree, offset);
 937                 break;
 938
 939         case IGMP_V2_MEMBERSHIP_REPORT:
 940         case IGMP_V2_LEAVE_GROUP:
 941                 offset = dissect_igmp_v2(tvb, pinfo, tree, type, offset);
 942                 break;
 943
 944         case IGMP_TRACEROUTE_RESPONSE:
 945         case IGMP_TRACEROUTE_QUERY_REQ:
 946                 offset = dissect_igmp_mtrace(tvb, pinfo, tree, type, offset);
 947                 break;
 948
 949         case IGMP_V3_MEMBERSHIP_REPORT:
 950                 offset = dissect_igmp_v3_report(tvb, pinfo, tree, type, offset);
 951                 break;
 952
 953         case IGMP_TYPE_0x23:
 954                 dst = g_htonl(MC_ALL_IGMPV3_ROUTERS);
 955                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
 956                         offset = dissect_msnip(tvb, pinfo, parent_tree, offset);
 957                 }
 958                 break;
 959
 960         case IGMP_TYPE_0x24:
 961                 dst = g_htonl(MC_ALL_ROUTERS);
 962                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
 963                         offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset);
 964                 }
 965                 dst = g_htonl(MC_ALL_IGMPV3_ROUTERS);
 966                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
 967                         offset = dissect_msnip(tvb, pinfo, parent_tree, offset);
 968                 }
 969                 break;
 970
 971         case IGMP_TYPE_0x25:
 972                 if ( tvb_reported_length(tvb)>=8 ) {
 973                         /* if len of igmp packet>=8 we assume it is MSNIP */
 974                         offset = dissect_msnip(tvb, pinfo, parent_tree, offset);
 975                 } else {
 976                         /* ok its not MSNIP, check if it might be MRDISC */
 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                 }
 982                 break;
 983
 984         case IGMP_TYPE_0x26:
 985                 dst = g_htonl(MC_ALL_ROUTERS);
 986                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
 987                         offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset);
 988                 }
 989                 break;
 990
 991         case IGMP_IGAP_JOIN:
 992         case IGMP_IGAP_QUERY:
 993         case IGMP_IGAP_LEAVE:
 994                 offset = dissect_igap(tvb, pinfo, parent_tree, offset);
 995                 break;
 996
 997         case IGMP_RGMP_HELLO:
 998         case IGMP_RGMP_BYE:
 999         case IGMP_RGMP_JOIN:
1000         case IGMP_RGMP_LEAVE:
1001                 dst = g_htonl(MC_RGMP);
1002                 if (!memcmp(pinfo->dst.data, &dst, 4)) {
1003                         offset = dissect_rgmp(tvb, pinfo, parent_tree, offset);
1004                 }
1005                 break;
1006
1007         default:
1008                 offset = dissect_igmp_unknown(tvb, pinfo, tree, type, offset);
1009                 break;
1010         }
1011
1012         proto_item_set_len(item, offset);
1013 }
1014
1015 void
1016 proto_register_igmp(void)
1017 {
1018         static hf_register_info hf[] = {
1019                 { &hf_type,
1020                         { "Type", "igmp.type", FT_UINT8, BASE_HEX,
1021                           VALS(commands), 0, "IGMP Packet Type", HFILL }},
1022
1023                 { &hf_version,
1024                         { "IGMP Version", "igmp.version", FT_UINT8, BASE_DEC,
1025                           NULL, 0, NULL, HFILL }},
1026
1027                 { &hf_group_type,
1028                         { "Type Of Group", "igmp.group_type", FT_UINT8, BASE_DEC,
1029                           VALS(vs_group_type), 0, "IGMP V0 Type Of Group", HFILL }},
1030
1031                 { &hf_reply_code,
1032                         { "Reply", "igmp.reply", FT_UINT8, BASE_DEC,
1033                           VALS(vs_reply_code), 0, "IGMP V0 Reply", HFILL }},
1034
1035                 { &hf_reply_pending,
1036                         { "Reply Pending", "igmp.reply.pending", FT_UINT8, BASE_DEC,
1037                           NULL, 0, "IGMP V0 Reply Pending, Retry in this many seconds", HFILL }},
1038
1039                 { &hf_checksum,
1040                         { "Checksum", "igmp.checksum", FT_UINT16, BASE_HEX,
1041                           NULL, 0, "IGMP Checksum", HFILL }},
1042
1043                 { &hf_checksum_bad,
1044                         { "Bad Checksum", "igmp.checksum_bad", FT_BOOLEAN, BASE_NONE,
1045                           NULL, 0x0, "Bad IGMP Checksum", HFILL }},
1046
1047                 { &hf_identifier,
1048                         { "Identifier", "igmp.identifier", FT_UINT32, BASE_DEC,
1049                           NULL, 0, "IGMP V0 Identifier", HFILL }},
1050
1051                 { &hf_access_key,
1052                         { "Access Key", "igmp.access_key", FT_BYTES, BASE_NONE,
1053                           NULL, 0, "IGMP V0 Access Key", HFILL }},
1054
1055                 { &hf_max_resp,
1056                         { "Max Resp Time", "igmp.max_resp", FT_UINT8, BASE_DEC,
1057                           NULL, 0, "Max Response Time", HFILL }},
1058
1059                 { &hf_suppress,
1060                         { "S", "igmp.s", FT_BOOLEAN, 8,
1061                           TFS(&tfs_s), IGMP_V3_S, "Suppress Router Side Processing", HFILL }},
1062
1063                 { &hf_qrv,
1064                         { "QRV", "igmp.qrv", FT_UINT8, BASE_DEC,
1065                         NULL, IGMP_V3_QRV_MASK, "Querier's Robustness Value", HFILL }},
1066
1067                 { &hf_qqic,
1068                         { "QQIC", "igmp.qqic", FT_UINT8, BASE_DEC,
1069                           NULL, 0, "Querier's Query Interval Code", HFILL }},
1070
1071                 { &hf_num_src,
1072                         { "Num Src", "igmp.num_src", FT_UINT16, BASE_DEC,
1073                           NULL, 0, "Number Of Sources", HFILL }},
1074
1075                 { &hf_saddr,
1076                         { "Source Address", "igmp.saddr", FT_IPv4, BASE_NONE,
1077                           NULL, 0, NULL, HFILL }},
1078
1079                 { &hf_num_grp_recs,
1080                         { "Num Group Records", "igmp.num_grp_recs", FT_UINT16, BASE_DEC,
1081                           NULL, 0, "Number Of Group Records", HFILL }},
1082
1083                 { &hf_record_type,
1084                         { "Record Type", "igmp.record_type", FT_UINT8, BASE_DEC,
1085                         VALS(vs_record_type), 0, NULL, HFILL }},
1086
1087                 { &hf_aux_data_len,
1088                         { "Aux Data Len", "igmp.aux_data_len", FT_UINT8, BASE_DEC,
1089                         NULL, 0, "Aux Data Len, In units of 32bit words", HFILL }},
1090
1091                 { &hf_maddr,
1092                         { "Multicast Address", "igmp.maddr", FT_IPv4, BASE_NONE,
1093                           NULL, 0, NULL, HFILL }},
1094
1095                 { &hf_aux_data,
1096                         { "Aux Data", "igmp.aux_data", FT_BYTES, BASE_NONE,
1097                           NULL, 0, "IGMP V3 Auxiliary Data", HFILL }},
1098
1099                 { &hf_max_resp_exp,
1100                         { "Exponent", "igmp.max_resp.exp", FT_UINT8, BASE_HEX,
1101                         NULL, IGMP_MAX_RESP_EXP, "Maximum Response Time, Exponent", HFILL }},
1102
1103                 { &hf_max_resp_mant,
1104                         { "Mantissa", "igmp.max_resp.mant", FT_UINT8, BASE_HEX,
1105                         NULL, IGMP_MAX_RESP_MANT, "Maximum Response Time, Mantissa", HFILL }},
1106
1107                 { &hf_mtrace_max_hops,
1108                         { "# hops", "igmp.mtrace.max_hops", FT_UINT8, BASE_DEC,
1109                         NULL, 0, "Maximum Number of Hops to Trace", HFILL }},
1110
1111                 { &hf_mtrace_saddr,
1112                         { "Source Address", "igmp.mtrace.saddr", FT_IPv4, BASE_NONE,
1113                           NULL, 0, "Multicast Source for the Path Being Traced", HFILL }},
1114
1115                 { &hf_mtrace_raddr,
1116                         { "Receiver Address", "igmp.mtrace.raddr", FT_IPv4, BASE_NONE,
1117                           NULL, 0, "Multicast Receiver for the Path Being Traced", HFILL }},
1118
1119                 { &hf_mtrace_rspaddr,
1120                         { "Response Address", "igmp.mtrace.rspaddr", FT_IPv4, BASE_NONE,
1121                           NULL, 0, "Destination of Completed Traceroute Response", HFILL }},
1122
1123                 { &hf_mtrace_resp_ttl,
1124                         { "Response TTL", "igmp.mtrace.resp_ttl", FT_UINT8, BASE_DEC,
1125                         NULL, 0, "TTL for Multicasted Responses", HFILL }},
1126
1127                 { &hf_mtrace_q_id,
1128                         { "Query ID", "igmp.mtrace.q_id", FT_UINT24, BASE_DEC,
1129                         NULL, 0, "Identifier for this Traceroute Request", HFILL }},
1130
1131                 { &hf_mtrace_q_arrival,
1132                         { "Query Arrival", "igmp.mtrace.q_arrival", FT_UINT32, BASE_DEC,
1133                         NULL, 0, "Query Arrival Time", HFILL }},
1134
1135                 { &hf_mtrace_q_inaddr,
1136                         { "In itf addr", "igmp.mtrace.q_inaddr", FT_IPv4, BASE_NONE,
1137                         NULL, 0, "Incoming Interface Address", HFILL }},
1138
1139                 { &hf_mtrace_q_outaddr,
1140                         { "Out itf addr", "igmp.mtrace.q_outaddr", FT_IPv4, BASE_NONE,
1141                         NULL, 0, "Outgoing Interface Address", HFILL }},
1142
1143                 { &hf_mtrace_q_prevrtr,
1144                         { "Previous rtr addr", "igmp.mtrace.q_prevrtr", FT_IPv4, BASE_NONE,
1145                         NULL, 0, "Previous-Hop Router Address", HFILL }},
1146
1147                 { &hf_mtrace_q_inpkt,
1148                         { "In pkts", "igmp.mtrace.q_inpkt", FT_UINT32, BASE_DEC,
1149                         NULL, 0, "Input packet count on incoming interface", HFILL }},
1150
1151                 { &hf_mtrace_q_outpkt,
1152                         { "Out pkts", "igmp.mtrace.q_outpkt", FT_UINT32, BASE_DEC,
1153                         NULL, 0, "Output packet count on outgoing interface", HFILL }},
1154
1155                 { &hf_mtrace_q_total,
1156                         { "S,G pkt count", "igmp.mtrace.q_total", FT_UINT32, BASE_DEC,
1157                         NULL, 0, "Total number of packets for this source-group pair", HFILL }},
1158
1159                 { &hf_mtrace_q_rtg_proto,
1160                         { "Rtg Protocol", "igmp.mtrace.q_rtg_proto", FT_UINT8, BASE_DEC,
1161                         VALS(mtrace_rtg_vals), 0, "Routing protocol between this and previous hop rtr", HFILL }},
1162
1163                 { &hf_mtrace_q_fwd_ttl,
1164                         { "FwdTTL", "igmp.mtrace.q_fwd_ttl", FT_UINT8, BASE_DEC,
1165                         NULL, 0, "TTL required for forwarding", HFILL }},
1166
1167                 { &hf_mtrace_q_mbz,
1168                         { "MBZ", "igmp.mtrace.q_mbz", FT_UINT8, BASE_HEX,
1169                         NULL, 0x80, "Must be zeroed on transmission and ignored on reception", HFILL }},
1170
1171                 { &hf_mtrace_q_s,
1172                         { "S", "igmp.mtrace.q_s", FT_UINT8, BASE_HEX,
1173                         NULL, 0x40, "Set if S,G packet count is for source network", HFILL }},
1174
1175                 { &hf_mtrace_q_src_mask,
1176                         { "Src Mask", "igmp.mtrace.q_src_mask", FT_UINT8, BASE_HEX,
1177                         NULL, 0x3F, "Source mask length. 63 when forwarding on group state", HFILL }},
1178
1179                 { &hf_mtrace_q_fwd_code,
1180                         { "Forwarding Code", "igmp.mtrace.q_fwd_code", FT_UINT8, BASE_HEX,
1181                         VALS(mtrace_fwd_code_vals), 0, "Forwarding information/error code", HFILL }},
1182
1183         };
1184         static gint *ett[] = {
1185                 &ett_igmp,
1186                 &ett_group_record,
1187                 &ett_sqrv_bits,
1188                 &ett_max_resp,
1189                 &ett_mtrace_block,
1190         };
1191
1192         proto_igmp = proto_register_protocol("Internet Group Management Protocol",
1193                 "IGMP", "igmp");
1194         proto_register_field_array(proto_igmp, hf, array_length(hf));
1195         proto_register_subtree_array(ett, array_length(ett));
1196 }
1197
1198 void
1199 proto_reg_handoff_igmp(void)
1200 {
1201         dissector_handle_t igmp_handle;
1202
1203         igmp_handle = create_dissector_handle(dissect_igmp, proto_igmp);
1204         dissector_add_uint("ip.proto", IP_PROTO_IGMP, igmp_handle);
1205 }
1206
1207 /*
1208  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
1209  *
1210  * Local variables:
1211  * c-basic-offset: 4
1212  * tab-width: 8
1213  * indent-tabs-mode: t
1214  * End:
1215  *
1216  * vi: set shiftwidth=4 tabstop=8 noexpandtab:
1217  * :indentSize=4:tabSize=8:noTabs=false:
1218  */
1219