forked from osmocom/wireshark
1098 lines
32 KiB
C
1098 lines
32 KiB
C
/* packet-igmp.c 2001 Ronnie Sahlberg <See AUTHORS for email>
|
|
* Routines for IGMP packet disassembly
|
|
*
|
|
* $Id: packet-igmp.c,v 1.25 2003/12/10 19:21:55 guy Exp $
|
|
*
|
|
* 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);
|
|
}
|