/* packet-igmp.c 2001 Ronnie Sahlberg * Routines for IGMP packet disassembly * * $Id$ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* IGMP is defined in the following RFCs RFC988 Version 0 Obsolete RFC1054 Version 1 RFC1112 Version 1 (same as RFC1054 as far as we are concerned) RFC2236 Version 2 draft-ietf-idmr-igmp-v3-07 Version 3 Size in bytes for each packet type RFC988 RFC1054 RFC2236 RFC???? DVMRP MRDISC MSNIP IGAP v0 v1 v2 v3 v1/v3 0x01 20 0x02 20 0x03 20 0x04 20 0x05 20 0x06 20 0x07 20 0x08 20 0x11 8* 8* >=12 0x12 8* 8* 0x13 x 0x16 8 0x17 8 0x22 >=8 0x23 >=8b 0x24 >=8a 8b 0x25 4a >=8b 0x26 4a 0x40 ??c 0x41 ??c 0x42 ??c * Differs in second byte of protocol. Always 0 in V1 Multicast traceroute was taken from draft-ietf-idmr-traceroute-ipm-07.txt Size in bytes for each packet type draft-ietf-idmr-traceroute-ipm-07.ps 0x1e 24 + n*32 0x1f 24 + n*32 (n == 0 for Query) x DVMRP Protocol see packet-dvmrp.c DVMRP is defined in the following RFCs RFC1075 Version 1 draft-ietf-idmr-dvmrp-v3-10.txt Version 3 V1 and V3 can be distinguished by looking at bytes 6 and 7 in the IGMP header. If header[6]==0xff and header[7]==0x03 we have version 3. a MRDISC Protocol see packet-mrdisc.c MRDISC : IGMP Multicast Router DISCovery draft-ietf-idmr-igmp-mrdisc-06.txt TTL == 1 and IP.DST==224.0.0.2 for all packets b MSNIP Protocol see packet-msnip.c MSNIP : Multicast Source Notification of Interest Protocol draft-ietf-idmr-msnip-00.txt 0x23, 0x24 are sent with ip.dst==224.0.0.22 0x25 is sent as unicast. c IGAP Protocol see packet-igap.c IGAP : Internet Group membership Authentication Protocol draft-hayashi-igap-03.txt */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #ifdef NEED_SNPRINTF_H # include "snprintf.h" #endif #include #include "ipproto.h" #include "in_cksum.h" #include "packet-dvmrp.h" #include "packet-pim.h" #include "packet-mrdisc.h" #include "packet-msnip.h" #include "packet-igap.h" static int proto_igmp = -1; static int hf_type = -1; static int hf_version = -1; static int hf_group_type = -1; static int hf_reply_code = -1; static int hf_reply_pending = -1; static int hf_checksum = -1; static int hf_checksum_bad = -1; static int hf_identifier = -1; static int hf_access_key = -1; static int hf_max_resp = -1; static int hf_max_resp_exp = -1; static int hf_max_resp_mant = -1; static int hf_supress = -1; static int hf_qrv = -1; static int hf_qqic = -1; static int hf_num_src = -1; static int hf_saddr = -1; static int hf_num_grp_recs = -1; static int hf_record_type = -1; static int hf_aux_data_len = -1; static int hf_maddr = -1; static int hf_aux_data = -1; static int hf_mtrace_max_hops = -1; static int hf_mtrace_saddr = -1; static int hf_mtrace_raddr = -1; static int hf_mtrace_rspaddr = -1; static int hf_mtrace_resp_ttl = -1; static int hf_mtrace_q_id = -1; static int hf_mtrace_q_arrival = -1; static int hf_mtrace_q_inaddr = -1; static int hf_mtrace_q_outaddr = -1; static int hf_mtrace_q_prevrtr = -1; static int hf_mtrace_q_inpkt = -1; static int hf_mtrace_q_outpkt = -1; static int hf_mtrace_q_total = -1; static int hf_mtrace_q_rtg_proto = -1; static int hf_mtrace_q_fwd_ttl = -1; static int hf_mtrace_q_mbz = -1; static int hf_mtrace_q_s = -1; static int hf_mtrace_q_src_mask = -1; static int hf_mtrace_q_fwd_code = -1; static int ett_igmp = -1; static int ett_group_record = -1; static int ett_sqrv_bits = -1; static int ett_max_resp = -1; static int ett_mtrace_block = -1; #define MC_ALL_ROUTERS 0xe0000002 #define MC_ALL_IGMPV3_ROUTERS 0xe0000016 #define IGMP_V0_CREATE_GROUP_REQUEST 0x01 #define IGMP_V0_CREATE_GROUP_REPLY 0x02 #define IGMP_V0_JOIN_GROUP_REQUEST 0x03 #define IGMP_V0_JOIN_GROUP_REPLY 0x04 #define IGMP_V0_LEAVE_GROUP_REQUEST 0x05 #define IGMP_V0_LEAVE_GROUP_REPLY 0x06 #define IGMP_V0_CONFIRM_GROUP_REQUEST 0x07 #define IGMP_V0_CONFIRM_GROUP_REPLY 0x08 #define IGMP_V1_HOST_MEMBERSHIP_QUERY 0x11 #define IGMP_V1_HOST_MEMBERSHIP_REPORT 0x12 #define IGMP_DVMRP 0x13 #define IGMP_V1_PIM_ROUTING_MESSAGE 0x14 #define IGMP_V2_MEMBERSHIP_REPORT 0x16 #define IGMP_V2_LEAVE_GROUP 0x17 #define IGMP_TRACEROUTE_RESPONSE 0x1e #define IGMP_TRACEROUTE_QUERY_REQ 0x1f #define IGMP_V3_MEMBERSHIP_REPORT 0x22 #define IGMP_TYPE_0x23 0x23 #define IGMP_TYPE_0x24 0x24 #define IGMP_TYPE_0x25 0x25 #define IGMP_TYPE_0x26 0x26 #define IGMP_TRACEROUTE_HDR_LEN 24 #define IGMP_TRACEROUTE_RSP_LEN 32 static const value_string commands[] = { {IGMP_V0_CREATE_GROUP_REQUEST, "Create Group Request" }, {IGMP_V0_CREATE_GROUP_REPLY, "Create Group Reply" }, {IGMP_V0_JOIN_GROUP_REQUEST, "Join Group Request" }, {IGMP_V0_JOIN_GROUP_REPLY, "Join Group Reply" }, {IGMP_V0_LEAVE_GROUP_REQUEST, "Leave Group Request" }, {IGMP_V0_LEAVE_GROUP_REPLY, "Leave Group Reply" }, {IGMP_V0_CONFIRM_GROUP_REQUEST, "Confirm Group Request" }, {IGMP_V0_CONFIRM_GROUP_REPLY, "Confirm Group Reply" }, {IGMP_V1_HOST_MEMBERSHIP_QUERY, "Membership Query" }, {IGMP_V1_HOST_MEMBERSHIP_REPORT,"Membership Report" }, {IGMP_DVMRP, "DVMRP Protocol" }, {IGMP_V1_PIM_ROUTING_MESSAGE, "PIM Routing Message" }, {IGMP_V2_MEMBERSHIP_REPORT, "Membership Report" }, {IGMP_V2_LEAVE_GROUP, "Leave Group" }, {IGMP_TRACEROUTE_RESPONSE, "Traceroute Response" }, {IGMP_TRACEROUTE_QUERY_REQ, "Traceroute Query or Request" }, {IGMP_V3_MEMBERSHIP_REPORT, "Membership Report" }, {0, NULL} }; #define IGMP_V3_S 0x08 #define IGMP_V3_QRV_MASK 0x07 #define IGMP_MAX_RESP_EXP 0x70 #define IGMP_MAX_RESP_MANT 0x0f #define IGMP_V0_GROUP_PUBLIC 0x00 #define IGMP_V0_GROUP_PRIVATE 0x01 static const value_string vs_group_type[] = { {IGMP_V0_GROUP_PUBLIC, "Public Group" }, {IGMP_V0_GROUP_PRIVATE, "Private Group" }, {0, NULL} }; #define IGMP_V0_REPLY_GRANTED 0x00 #define IGMP_V0_REPLY_NO_RESOURCES 0x01 #define IGMP_V0_REPLY_INVALID_CODE 0x02 #define IGMP_V0_REPLY_INVALID_GROUP 0x03 #define IGMP_V0_REPLY_INVALID_KEY 0x04 static const value_string vs_reply_code[] = { {IGMP_V0_REPLY_GRANTED, "Request Granted" }, {IGMP_V0_REPLY_NO_RESOURCES, "Request Denied, No Resources" }, {IGMP_V0_REPLY_INVALID_CODE, "Request Denied, Invalid Code" }, {IGMP_V0_REPLY_INVALID_GROUP, "Request Denied, Invalid Group" }, {IGMP_V0_REPLY_INVALID_KEY, "Request Denied, Invalid Key" }, {0, NULL} }; static const true_false_string tfs_s = { "SUPRESS router side processing", "Do not supress router side processing" }; #define IGMP_V3_MODE_IS_INCLUDE 1 #define IGMP_V3_MODE_IS_EXCLUDE 2 #define IGMP_V3_CHANGE_TO_INCLUDE_MODE 3 #define IGMP_V3_CHANGE_TO_EXCLUDE_MODE 4 #define IGMP_V3_ALLOW_NEW_SOURCES 5 #define IGMP_V3_BLOCK_OLD_SOURCES 6 static const value_string vs_record_type[] = { {IGMP_V3_MODE_IS_INCLUDE, "Mode Is Include" }, {IGMP_V3_MODE_IS_EXCLUDE, "Mode Is Exclude" }, {IGMP_V3_CHANGE_TO_INCLUDE_MODE,"Change To Include Mode" }, {IGMP_V3_CHANGE_TO_EXCLUDE_MODE,"Change To Exclude Mode" }, {IGMP_V3_ALLOW_NEW_SOURCES, "Allow New Sources" }, {IGMP_V3_BLOCK_OLD_SOURCES, "Block Old Sources" }, { 0, NULL} }; static const value_string mtrace_rtg_vals[] = { {1, "DVMRP" }, {2, "MOSPF" }, {3, "PIM" }, {4, "CBT" }, {5, "PIM using special routing table" }, {6, "PIM using a static route" }, {7, "DVMRP using a static route" }, {8, "PIM using MBGP (aka BGP4+) route" }, {9, "CBT using special routing table" }, {10, "CBT using a static route" }, {11, "PIM using state created by Assert processing" }, {0, NULL} }; static const value_string mtrace_fwd_code_vals[] = { {0x00, "NO_ERROR" }, {0x01, "WRONG_IF" }, {0x02, "PRUNE_SENT" }, {0x03, "PRUNE_RCVD" }, {0x04, "SCOPED" }, {0x05, "NO_ROUTE" }, {0x06, "WRONG_LAST_HOP" }, {0x07, "NOT_FORWARDING" }, {0x08, "REACHED_RP" }, {0x09, "RPF_IF" }, {0x0A, "NO_MULTICAST" }, {0x0B, "INFO_HIDDEN" }, {0x81, "NO_SPACE" }, {0x82, "OLD_ROUTER" }, {0x83, "ADMIN_PROHIB" }, {0, NULL} }; #define PRINT_IGMP_VERSION(version) \ if (check_col(pinfo->cinfo, COL_INFO)) { \ col_add_fstr(pinfo->cinfo, COL_INFO, \ "V%d %s",version,val_to_str(type, commands, \ "Unknown Type:0x%02x")); \ } \ /* version of IGMP protocol */ \ proto_tree_add_uint(tree, hf_version, tvb, 0, 0, version); \ /* type of command */ \ proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type); \ offset += 1; void igmp_checksum(proto_tree *tree, tvbuff_t *tvb, int hf_index, int hf_index_bad, packet_info *pinfo, guint len) { guint16 cksum, hdrcksum; vec_t cksum_vec[1]; if (len == 0) { /* * Checksum the entire IGMP packet. */ len = tvb_reported_length(tvb); } hdrcksum = tvb_get_ntohs(tvb, 2); if (!pinfo->fragmented && tvb_length(tvb) >= len) { /* * The packet isn't part of a fragmented datagram and isn't * truncated, so we can checksum it. */ cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, len); cksum_vec[0].len = len; cksum = in_cksum(&cksum_vec[0],1); if (cksum == 0) { proto_tree_add_uint_format(tree, hf_index, tvb, 2, 2, hdrcksum, "Header checksum: 0x%04x (correct)", hdrcksum); } else { proto_tree_add_boolean_hidden(tree, hf_index_bad, tvb, 2, 2, TRUE); proto_tree_add_uint_format(tree, hf_index, tvb, 2, 2, hdrcksum, "Header checksum: 0x%04x (incorrect, should be 0x%04x)", hdrcksum,in_cksum_shouldbe(hdrcksum,cksum)); } } else proto_tree_add_uint(tree, hf_index, tvb, 2, 2, hdrcksum); return; } /* Unknown IGMP message type */ static int dissect_igmp_unknown(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset) { int len; if (check_col(pinfo->cinfo, COL_INFO)) { col_add_str(pinfo->cinfo, COL_INFO, val_to_str(type, commands, "Unknown Type:0x%02x")); } /* type of command */ proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type); offset += 1; /* Just call the rest of it "data" */ len = tvb_length_remaining(tvb, offset); proto_tree_add_text(tree, tvb, offset, len, "Data"); offset += len; return offset; } /************************************************************* * IGMP Protocol dissectors *************************************************************/ static int dissect_v3_max_resp(tvbuff_t *tvb, proto_tree *parent_tree, int offset) { proto_tree *tree; proto_item *item; guint8 bits; guint32 tsecs; bits = tvb_get_guint8(tvb, offset); if (bits&0x80) { tsecs = ((bits&IGMP_MAX_RESP_MANT)|0x10); tsecs = tsecs << ( ((bits&IGMP_MAX_RESP_EXP)>>4) + 3); } else { tsecs = bits; } item = proto_tree_add_uint_format(parent_tree, hf_max_resp, tvb, offset, 1, tsecs, "Max Response Time: %.1f sec (0x%02x)",tsecs*0.1,bits); if (bits&0x80) { tree = proto_item_add_subtree(item, ett_max_resp); proto_tree_add_uint(tree, hf_max_resp_exp, tvb, offset, 1, bits); proto_tree_add_uint(tree, hf_max_resp_mant, tvb, offset, 1, bits); } offset += 1; return offset; } static int dissect_v3_sqrv_bits(tvbuff_t *tvb, proto_tree *parent_tree, int offset) { proto_tree *tree; proto_item *item; guint8 bits; bits = tvb_get_guint8(tvb, offset); item = proto_tree_add_text(parent_tree, tvb, offset, 1, "QRV=%d S=%s", bits&IGMP_V3_QRV_MASK, (bits&IGMP_V3_S)?tfs_s.true_string:tfs_s.false_string); tree = proto_item_add_subtree(item, ett_sqrv_bits); /* S flag */ proto_tree_add_boolean(tree, hf_supress, tvb, offset, 1, bits); /* QRV */ proto_tree_add_uint(tree, hf_qrv, tvb, offset, 1, bits); offset += 1; return offset; } static int dissect_v3_group_record(tvbuff_t *tvb, proto_tree *parent_tree, int offset) { proto_tree *tree; proto_item *item; int old_offset = offset; guint8 adl; guint16 num; guint32 ip; tvb_memcpy(tvb, (guint8 *)&ip, offset+4, 4); item = proto_tree_add_text(parent_tree, tvb, offset, -1, "Group Record : %s %s", ip_to_str((gchar*)&ip), val_to_str(tvb_get_guint8(tvb, offset), vs_record_type,"") ); tree = proto_item_add_subtree(item, ett_group_record); /* record type */ proto_tree_add_item(tree, hf_record_type, tvb, offset, 1, FALSE); offset += 1; /* aux data len */ adl = tvb_get_guint8(tvb, offset); proto_tree_add_uint(tree, hf_aux_data_len, tvb, offset, 1, adl); offset += 1; /*number of sources*/ num = tvb_get_ntohs(tvb, offset); proto_tree_add_uint(tree, hf_num_src, tvb, offset, 2, num); offset += 2; /* multicast address */ proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE); offset += 4; /* source addresses */ while(num--){ proto_tree_add_item(tree, hf_saddr, tvb, offset, 4, FALSE); offset += 4; } /* aux data */ if(adl){ proto_tree_add_item(tree, hf_aux_data, tvb, offset, adl*4, FALSE); offset += adl*4; } proto_item_set_len(item, offset-old_offset); return offset; } /* dissectors for version 3, rfc???? */ static int dissect_igmp_v3_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset) { guint16 num; PRINT_IGMP_VERSION(3); /* skip reserved field*/ offset += 1; /* checksum */ igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0); offset += 2; /* skip reserved field */ offset += 2; /* number of group records */ num = tvb_get_ntohs(tvb, offset); proto_tree_add_uint(tree, hf_num_grp_recs, tvb, offset, 2, num); offset += 2; while (num--) { offset = dissect_v3_group_record(tvb, tree, offset); } return offset; } static int dissect_igmp_v3_query(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset) { guint16 num; PRINT_IGMP_VERSION(3); num = tvb_get_ntohs(tvb, offset+9); /* max resp code */ offset = dissect_v3_max_resp(tvb, tree, offset); /* checksum */ igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0); offset += 2; /* group address */ proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE); offset +=4; /* bitmask for S and QRV */ offset = dissect_v3_sqrv_bits(tvb, tree, offset); /* qqic */ proto_tree_add_item(tree, hf_qqic, tvb, offset, 1, FALSE); offset += 1; /*number of sources*/ proto_tree_add_uint(tree, hf_num_src, tvb, offset, 2, num); offset += 2; while(num--){ proto_tree_add_item(tree, hf_saddr, tvb, offset, 4, FALSE); offset += 4; } return offset; } /* dissector for version 2, rfc2236 */ static int dissect_igmp_v2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset) { guint8 tsecs; PRINT_IGMP_VERSION(2); /* max resp time */ tsecs = tvb_get_guint8(tvb, offset); proto_tree_add_uint_format(tree, hf_max_resp, tvb, offset, 1, tsecs, "Max Response Time: %.1f sec (0x%02x)", tsecs*0.1,tsecs); offset += 1; /* checksum */ igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 8); offset += 2; /* group address */ proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE); offset +=4; return offset; } /* dissector for version 1, rfc1054 */ static int dissect_igmp_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset) { PRINT_IGMP_VERSION(1); /* skip unused byte */ offset += 1; /* checksum */ igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 8); offset += 2; /* group address */ proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE); offset +=4; return offset; } /* dissector for version 0, rfc988 */ static int dissect_igmp_v0(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset) { unsigned char code; PRINT_IGMP_VERSION(0); /* Code */ code = tvb_get_guint8(tvb, offset); if (type==IGMP_V0_CREATE_GROUP_REQUEST) { proto_tree_add_uint(tree, hf_group_type, tvb, offset, 1, code); } else if (!(type&0x01)) { if (code <5) { proto_tree_add_uint(tree, hf_reply_code, tvb, offset, 1, code); } else { proto_tree_add_uint(tree, hf_reply_pending, tvb, offset, 1, code); } } offset += 1; /* checksum */ igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 20); offset += 2; /* identifier */ proto_tree_add_item(tree, hf_identifier, tvb, offset, 4, FALSE); offset += 4; /* group address */ proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE); offset +=4; /* access key */ proto_tree_add_item(tree, hf_access_key, tvb, offset, 8, FALSE); offset +=8; return offset; } /* dissector for multicast traceroute, rfc???? */ static int dissect_igmp_mtrace(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int type, int offset) { char *typestr, *blocks = NULL; char buf[20]; /* All multicast traceroute packets (Query, Request and * Response) have the same fixed header. Request and Response * have one or more response data blocks following this fixed * header. Since Query and Request share the same IGMP type, * the method to differentiate between them is to check the * IGMP packet length. Queries are only * IGMP_TRACEROUTE_HDR_LEN bytes long. */ if (type == IGMP_TRACEROUTE_RESPONSE) { int i = (tvb_reported_length_remaining(tvb, offset) - IGMP_TRACEROUTE_HDR_LEN) / IGMP_TRACEROUTE_RSP_LEN; snprintf(buf, sizeof buf, ", %d block%s", i, plurality(i, "", "s")); typestr = "Traceroute Response"; blocks = buf; } else if (tvb_reported_length_remaining(tvb, offset) == IGMP_TRACEROUTE_HDR_LEN) typestr = "Traceroute Query"; else typestr = "Traceroute Request"; if (check_col(pinfo->cinfo, COL_INFO)) { col_set_str(pinfo->cinfo, COL_INFO, typestr); if (blocks) col_append_str(pinfo->cinfo, COL_INFO, blocks); } proto_tree_add_uint_format(tree, hf_type, tvb, offset, 1, type, "Type: %s (0x%02x)", typestr, type); offset += 1; /* maximum number of hops that the requester wants to trace */ proto_tree_add_item(tree, hf_mtrace_max_hops, tvb, offset, 1, FALSE); offset += 1; /* checksum */ igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0); offset += 2; /* group address to be traced */ proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, FALSE); offset += 4; /* address of multicast source for the path being traced */ proto_tree_add_item(tree, hf_mtrace_saddr, tvb, offset, 4, FALSE); offset += 4; /* address of multicast receiver for the path being traced */ proto_tree_add_item(tree, hf_mtrace_raddr, tvb, offset, 4, FALSE); offset += 4; /* address where the completed traceroute response packet gets sent */ proto_tree_add_item(tree, hf_mtrace_rspaddr, tvb, offset, 4, FALSE); offset += 4; /* for multicasted responses, TTL at which to multicast the response */ proto_tree_add_item(tree, hf_mtrace_resp_ttl, tvb, offset, 1, FALSE); offset += 1; /* unique identifier for this traceroute request (for e.g. duplicate/delay detection) */ proto_tree_add_item(tree, hf_mtrace_q_id, tvb, offset, 3, FALSE); offset += 3; /* If this was Query, we only had the fixed header */ if (tvb_reported_length_remaining(tvb, offset) == 0) return offset; /* Loop through the response data blocks */ while (tvb_reported_length_remaining(tvb, offset) >= IGMP_TRACEROUTE_RSP_LEN) { proto_item *bi; proto_tree *block_tree; bi = proto_tree_add_text(tree, tvb, offset, IGMP_TRACEROUTE_RSP_LEN, "Response data block: %s -> %s, Proto: %s, Forwarding Code: %s", ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)), ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)), val_to_str(tvb_get_guint8(tvb, offset + 28), mtrace_rtg_vals, "Unknown"), val_to_str(tvb_get_guint8(tvb, offset + 31), mtrace_fwd_code_vals, "Unknown")); block_tree = proto_item_add_subtree(bi, ett_mtrace_block); /* Query Arrival Time */ proto_tree_add_item(block_tree, hf_mtrace_q_arrival, tvb, offset, 4, FALSE); offset += 4; /* Incoming Interface Address */ proto_tree_add_item(block_tree, hf_mtrace_q_inaddr, tvb, offset, 4, FALSE); offset += 4; /* Outgoing Interface Address */ proto_tree_add_item(block_tree, hf_mtrace_q_outaddr, tvb, offset, 4, FALSE); offset += 4; /* Previous-Hop Router Address */ proto_tree_add_item(block_tree, hf_mtrace_q_prevrtr, tvb, offset, 4, FALSE); offset += 4; /* Input packet count on incoming interface */ proto_tree_add_item(block_tree, hf_mtrace_q_inpkt, tvb, offset, 4, FALSE); offset += 4; /* Output packet count on outgoing interface */ proto_tree_add_item(block_tree, hf_mtrace_q_outpkt, tvb, offset, 4, FALSE); offset += 4; /* Total number of packets for this source-group pair */ proto_tree_add_item(block_tree, hf_mtrace_q_total, tvb, offset, 4, FALSE); offset += 4; /* Routing protocol in use between this and previous-hop router */ proto_tree_add_item(block_tree, hf_mtrace_q_rtg_proto, tvb, offset, 1, FALSE); offset += 1; /* TTL that a packet is required to be forwarded */ proto_tree_add_item(block_tree, hf_mtrace_q_fwd_ttl, tvb, offset, 1, FALSE); offset += 1; /* Must be zeroed and ignored bit, S bit and src network mask length */ proto_tree_add_item(block_tree, hf_mtrace_q_mbz, tvb, offset, 1, FALSE); proto_tree_add_item(block_tree, hf_mtrace_q_s, tvb, offset, 1, FALSE); proto_tree_add_item(block_tree, hf_mtrace_q_src_mask, tvb, offset, 1, FALSE); offset += 1; /* Forwarding information/error code */ proto_tree_add_item(block_tree, hf_mtrace_q_fwd_code, tvb, offset, 1, FALSE); offset += 1; } return offset; } static void dissect_igmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) { proto_tree *tree; proto_item *item; int offset = 0; unsigned char type; guint32 dst; item = proto_tree_add_item(parent_tree, proto_igmp, tvb, offset, -1, FALSE); tree = proto_item_add_subtree(item, ett_igmp); if (check_col(pinfo->cinfo, COL_PROTOCOL)) { col_set_str(pinfo->cinfo, COL_PROTOCOL, "IGMP"); } if (check_col(pinfo->cinfo, COL_INFO)) { col_clear(pinfo->cinfo, COL_INFO); } type = tvb_get_guint8(tvb, offset); /* version 0 */ if ((type&0xf0)==0){ offset = dissect_igmp_v0(tvb, pinfo, tree, type, offset); } switch (type) { case IGMP_V1_HOST_MEMBERSHIP_QUERY: /* 0x11 v1/v2/v3 */ if ( (pinfo->iplen-pinfo->iphdrlen)>=12 ) { /* version 3 */ offset = dissect_igmp_v3_query(tvb, pinfo, tree, type, offset); } else { /* v1 and v2 differs in second byte of header */ if (tvb_get_guint8(tvb, offset+1)) { offset = dissect_igmp_v2(tvb, pinfo, tree, type, offset); } else { offset = dissect_igmp_v1(tvb, pinfo, tree, type, offset); } } break; case IGMP_V1_HOST_MEMBERSHIP_REPORT: /* 0x12 v1 only */ offset = dissect_igmp_v1(tvb, pinfo, tree, type, offset); break; case IGMP_DVMRP: offset = dissect_dvmrp(tvb, pinfo, parent_tree, offset); break; case IGMP_V1_PIM_ROUTING_MESSAGE: offset = dissect_pimv1(tvb, pinfo, parent_tree, offset); break; case IGMP_V2_MEMBERSHIP_REPORT: case IGMP_V2_LEAVE_GROUP: offset = dissect_igmp_v2(tvb, pinfo, tree, type, offset); break; case IGMP_TRACEROUTE_RESPONSE: case IGMP_TRACEROUTE_QUERY_REQ: offset = dissect_igmp_mtrace(tvb, pinfo, tree, type, offset); break; case IGMP_V3_MEMBERSHIP_REPORT: offset = dissect_igmp_v3_response(tvb, pinfo, tree, type, offset); break; case IGMP_TYPE_0x23: dst = g_htonl(MC_ALL_IGMPV3_ROUTERS); if (!memcmp(pinfo->dst.data, &dst, 4)) { offset = dissect_msnip(tvb, pinfo, parent_tree, offset); } break; case IGMP_TYPE_0x24: dst = g_htonl(MC_ALL_ROUTERS); if (!memcmp(pinfo->dst.data, &dst, 4)) { offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset); } dst = g_htonl(MC_ALL_IGMPV3_ROUTERS); if (!memcmp(pinfo->dst.data, &dst, 4)) { offset = dissect_msnip(tvb, pinfo, parent_tree, offset); } break; case IGMP_TYPE_0x25: if ( (pinfo->iplen-pinfo->iphdrlen)>=8 ) { /* if len of igmp packet>=8 we assume it is MSNIP */ offset = dissect_msnip(tvb, pinfo, parent_tree, offset); } else { /* ok its not MSNIP, check if it might be MRDISC */ dst = g_htonl(MC_ALL_ROUTERS); if (!memcmp(pinfo->dst.data, &dst, 4)) { offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset); } } break; case IGMP_TYPE_0x26: dst = g_htonl(MC_ALL_ROUTERS); if (!memcmp(pinfo->dst.data, &dst, 4)) { offset = dissect_mrdisc(tvb, pinfo, parent_tree, offset); } break; case IGMP_IGAP_JOIN: case IGMP_IGAP_QUERY: case IGMP_IGAP_LEAVE: offset = dissect_igap(tvb, pinfo, parent_tree, offset); break; default: offset = dissect_igmp_unknown(tvb, pinfo, tree, type, offset); break; } proto_item_set_len(item, offset); } void proto_register_igmp(void) { static hf_register_info hf[] = { { &hf_type, { "Type", "igmp.type", FT_UINT8, BASE_HEX, VALS(commands), 0, "IGMP Packet Type", HFILL }}, { &hf_version, { "IGMP Version", "igmp.version", FT_UINT8, BASE_DEC, NULL, 0, "IGMP Version", HFILL }}, { &hf_group_type, { "Type Of Group", "igmp.group_type", FT_UINT8, BASE_DEC, VALS(vs_group_type), 0, "IGMP V0 Type Of Group", HFILL }}, { &hf_reply_code, { "Reply", "igmp.reply", FT_UINT8, BASE_DEC, VALS(vs_reply_code), 0, "IGMP V0 Reply", HFILL }}, { &hf_reply_pending, { "Reply Pending", "igmp.reply.pending", FT_UINT8, BASE_DEC, NULL, 0, "IGMP V0 Reply Pending, Retry in this many seconds", HFILL }}, { &hf_checksum, { "Checksum", "igmp.checksum", FT_UINT16, BASE_HEX, NULL, 0, "IGMP Checksum", HFILL }}, { &hf_checksum_bad, { "Bad Checksum", "igmp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0, "Bad IGMP Checksum", HFILL }}, { &hf_identifier, { "Identifier", "igmp.identifier", FT_UINT32, BASE_DEC, NULL, 0, "IGMP V0 Identifier", HFILL }}, { &hf_access_key, { "Access Key", "igmp.access_key", FT_BYTES, BASE_HEX, NULL, 0, "IGMP V0 Access Key", HFILL }}, { &hf_max_resp, { "Max Resp Time", "igmp.max_resp", FT_UINT8, BASE_DEC, NULL, 0, "Max Response Time", HFILL }}, { &hf_supress, { "S", "igmp.s", FT_BOOLEAN, 8, TFS(&tfs_s), IGMP_V3_S, "Supress Router Side Processing", HFILL }}, { &hf_qrv, { "QRV", "igmp.qrv", FT_UINT8, BASE_DEC, NULL, IGMP_V3_QRV_MASK, "Querier's Robustness Value", HFILL }}, { &hf_qqic, { "QQIC", "igmp.qqic", FT_UINT8, BASE_DEC, NULL, 0, "Querier's Query Interval Code", HFILL }}, { &hf_num_src, { "Num Src", "igmp.num_src", FT_UINT16, BASE_DEC, NULL, 0, "Number Of Sources", HFILL }}, { &hf_saddr, { "Source Address", "igmp.saddr", FT_IPv4, BASE_NONE, NULL, 0, "Source Address", HFILL }}, { &hf_num_grp_recs, { "Num Group Records", "igmp.num_grp_recs", FT_UINT16, BASE_DEC, NULL, 0, "Number Of Group Records", HFILL }}, { &hf_record_type, { "Record Type", "igmp.record_type", FT_UINT8, BASE_DEC, VALS(vs_record_type), 0, "Record Type", HFILL }}, { &hf_aux_data_len, { "Aux Data Len", "igmp.aux_data_len", FT_UINT8, BASE_DEC, NULL, 0, "Aux Data Len, In units of 32bit words", HFILL }}, { &hf_maddr, { "Multicast Address", "igmp.maddr", FT_IPv4, BASE_NONE, NULL, 0, "Multicast Address", HFILL }}, { &hf_aux_data, { "Aux Data", "igmp.aux_data", FT_BYTES, BASE_HEX, NULL, 0, "IGMP V3 Auxiliary Data", HFILL }}, { &hf_max_resp_exp, { "Exponent", "igmp.max_resp.exp", FT_UINT8, BASE_HEX, NULL, IGMP_MAX_RESP_EXP, "Maxmimum Response Time, Exponent", HFILL }}, { &hf_max_resp_mant, { "Mantissa", "igmp.max_resp.mant", FT_UINT8, BASE_HEX, NULL, IGMP_MAX_RESP_MANT, "Maxmimum Response Time, Mantissa", HFILL }}, { &hf_mtrace_max_hops, { "# hops", "igmp.mtrace.max_hops", FT_UINT8, BASE_DEC, NULL, 0, "Maxmimum Number of Hops to Trace", HFILL }}, { &hf_mtrace_saddr, { "Source Address", "igmp.mtrace.saddr", FT_IPv4, BASE_NONE, NULL, 0, "Multicast Source for the Path Being Traced", HFILL }}, { &hf_mtrace_raddr, { "Receiver Address", "igmp.mtrace.raddr", FT_IPv4, BASE_NONE, NULL, 0, "Multicast Receiver for the Path Being Traced", HFILL }}, { &hf_mtrace_rspaddr, { "Response Address", "igmp.mtrace.rspaddr", FT_IPv4, BASE_NONE, NULL, 0, "Destination of Completed Traceroute Response", HFILL }}, { &hf_mtrace_resp_ttl, { "Response TTL", "igmp.mtrace.resp_ttl", FT_UINT8, BASE_DEC, NULL, 0, "TTL for Multicasted Responses", HFILL }}, { &hf_mtrace_q_id, { "Query ID", "igmp.mtrace.q_id", FT_UINT24, BASE_DEC, NULL, 0, "Identifier for this Traceroute Request", HFILL }}, { &hf_mtrace_q_arrival, { "Query Arrival", "igmp.mtrace.q_arrival", FT_UINT32, BASE_DEC, NULL, 0, "Query Arrival Time", HFILL }}, { &hf_mtrace_q_inaddr, { "In itf addr", "igmp.mtrace.q_inaddr", FT_IPv4, BASE_NONE, NULL, 0, "Incoming Interface Address", HFILL }}, { &hf_mtrace_q_outaddr, { "Out itf addr", "igmp.mtrace.q_outaddr", FT_IPv4, BASE_NONE, NULL, 0, "Outgoing Interface Address", HFILL }}, { &hf_mtrace_q_prevrtr, { "Previous rtr addr", "igmp.mtrace.q_prevrtr", FT_IPv4, BASE_NONE, NULL, 0, "Previous-Hop Router Address", HFILL }}, { &hf_mtrace_q_inpkt, { "In pkts", "igmp.mtrace.q_inpkt", FT_UINT32, BASE_DEC, NULL, 0, "Input packet count on incoming interface", HFILL }}, { &hf_mtrace_q_outpkt, { "Out pkts", "igmp.mtrace.q_outpkt", FT_UINT32, BASE_DEC, NULL, 0, "Output packet count on outgoing interface", HFILL }}, { &hf_mtrace_q_total, { "S,G pkt count", "igmp.mtrace.q_total", FT_UINT32, BASE_DEC, NULL, 0, "Total number of packets for this source-group pair", HFILL }}, { &hf_mtrace_q_rtg_proto, { "Rtg Protocol", "igmp.mtrace.q_rtg_proto", FT_UINT8, BASE_DEC, VALS(&mtrace_rtg_vals), 0, "Routing protocol between this and previous hop rtr", HFILL }}, { &hf_mtrace_q_fwd_ttl, { "FwdTTL", "igmp.mtrace.q_fwd_ttl", FT_UINT8, BASE_DEC, NULL, 0, "TTL required for forwarding", HFILL }}, { &hf_mtrace_q_mbz, { "MBZ", "igmp.mtrace.q_mbz", FT_UINT8, BASE_HEX, NULL, 0x80, "Must be zeroed on transmission and ignored on reception", HFILL }}, { &hf_mtrace_q_s, { "S", "igmp.mtrace.q_s", FT_UINT8, BASE_HEX, NULL, 0x40, "Set if S,G packet count is for source network", HFILL }}, { &hf_mtrace_q_src_mask, { "Src Mask", "igmp.mtrace.q_src_mask", FT_UINT8, BASE_HEX, NULL, 0x3F, "Source mask length. 63 when forwarding on group state", HFILL }}, { &hf_mtrace_q_fwd_code, { "Forwarding Code", "igmp.mtrace.q_fwd_code", FT_UINT8, BASE_HEX, VALS(&mtrace_fwd_code_vals), 0, "Forwarding information/error code", HFILL }}, }; static gint *ett[] = { &ett_igmp, &ett_group_record, &ett_sqrv_bits, &ett_max_resp, &ett_mtrace_block, }; proto_igmp = proto_register_protocol("Internet Group Management Protocol", "IGMP", "igmp"); proto_register_field_array(proto_igmp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_igmp(void) { dissector_handle_t igmp_handle; igmp_handle = create_dissector_handle(dissect_igmp, proto_igmp); dissector_add("ip.proto", IP_PROTO_IGMP, igmp_handle); }