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Diffstat (limited to 'epan/dissectors/packet-igmp.c')
| -rw-r--r-- | epan/dissectors/packet-igmp.c | 1097 |
1 files changed, 1097 insertions, 0 deletions
diff --git a/epan/dissectors/packet-igmp.c b/epan/dissectors/packet-igmp.c new file mode 100644 index 0000000000..11aaad97a1 --- /dev/null +++ b/epan/dissectors/packet-igmp.c @@ -0,0 +1,1097 @@ +/* packet-igmp.c 2001 Ronnie Sahlberg <See AUTHORS for email> + * Routines for IGMP packet disassembly + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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 <stdio.h> +#include <string.h> +#include <glib.h> + +#ifdef NEED_SNPRINTF_H +# include "snprintf.h" +#endif + +#include <epan/packet.h> +#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); +} |