![Guy Harris](/assets/img/avatar_default.png)
arguments that specify the header field indices for the checksum field and the "checksum is bad" Boolean, and have the dissectors for some protocols that use IGMP (DVMRP, MRDISC, MSNIP) use it rather than having their own checksumming routines. Also, fix it to correctly add the "checksum is bad" Boolean. svn path=/trunk/; revision=4665
339 lines
8.2 KiB
C
339 lines
8.2 KiB
C
/* packet-msnip.c 2001 Ronnie Sahlberg <See AUTHORS for email>
|
|
* Routines for IGMP/MSNIP packet disassembly
|
|
*
|
|
* $Id: packet-msnip.c,v 1.6 2002/02/01 11:01:57 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.
|
|
*/
|
|
/*
|
|
|
|
|
|
MSNIP
|
|
code
|
|
|
|
0x23 x
|
|
0x24 x
|
|
0x25 x
|
|
|
|
MSNIP " Multicast Source Notification of Interest Protocol
|
|
Defined in draft-ietf-idmr-igmp-msnip-00.txt
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
# include <sys/types.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <glib.h>
|
|
|
|
#include <epan/packet.h>
|
|
#include "packet-igmp.h"
|
|
#include "packet-msnip.h"
|
|
|
|
|
|
static int proto_msnip = -1;
|
|
static int hf_checksum = -1;
|
|
static int hf_checksum_bad = -1;
|
|
static int hf_type = -1;
|
|
static int hf_count = -1;
|
|
static int hf_holdtime = -1;
|
|
static int hf_groups = -1;
|
|
static int hf_maddr = -1;
|
|
static int hf_mask = -1;
|
|
static int hf_holdtime16 = -1;
|
|
static int hf_genid = -1;
|
|
static int hf_rec_type = -1;
|
|
|
|
static int ett_msnip = -1;
|
|
static int ett_groups = -1;
|
|
|
|
|
|
#define MSNIP_GM 0x23
|
|
#define MSNIP_IS 0x24
|
|
#define MSNIP_RMR 0x25
|
|
static const value_string msnip_types[] = {
|
|
{MSNIP_GM, "Multicast Group Map"},
|
|
{MSNIP_IS, "Multicast Interest Solicitation"},
|
|
{MSNIP_RMR, "Multicast Receiver Membership Report"},
|
|
{0, NULL}
|
|
};
|
|
|
|
#define MSNIP_RECTYPE_TRANSMIT 1
|
|
#define MSNIP_RECTYPE_HOLD 2
|
|
static const value_string msnip_rec_types[] = {
|
|
{MSNIP_RECTYPE_TRANSMIT, "Request to start transmitting group"},
|
|
{MSNIP_RECTYPE_HOLD, "Request to hold transmitting group"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static int
|
|
dissect_msnip_rmr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
|
|
{
|
|
guint8 count;
|
|
|
|
/* group count */
|
|
count = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
|
|
offset += 1;
|
|
|
|
/* checksum */
|
|
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
|
|
offset += 2;
|
|
|
|
while (count--) {
|
|
proto_tree *tree;
|
|
proto_item *item;
|
|
guint8 rec_type;
|
|
guint32 maddr;
|
|
int old_offset = offset;
|
|
|
|
item = proto_tree_add_item(parent_tree, hf_groups,
|
|
tvb, offset, -1, FALSE);
|
|
tree = proto_item_add_subtree(item, ett_groups);
|
|
|
|
/* record type */
|
|
rec_type = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_rec_type, tvb, offset, 1, rec_type);
|
|
offset += 1;
|
|
|
|
/* skip 3 unused bytes */
|
|
offset += 3;
|
|
|
|
/* multicast group */
|
|
tvb_memcpy(tvb, (guint8 *)&maddr, offset, 4);
|
|
proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
|
|
maddr);
|
|
offset += 4;
|
|
|
|
if (item) {
|
|
proto_item_set_text(item,"Group: %s %s",
|
|
ip_to_str((guint8 *)&maddr),
|
|
val_to_str(rec_type, msnip_rec_types,
|
|
"Unknown Type:0x%02x"));
|
|
|
|
proto_item_set_len(item, offset-old_offset);
|
|
}
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_msnip_is(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
|
|
{
|
|
|
|
/* skip reserved byte */
|
|
offset += 1;
|
|
|
|
/* checksum */
|
|
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
|
|
offset += 2;
|
|
|
|
/* 16 bit holdtime */
|
|
proto_tree_add_uint(parent_tree, hf_holdtime16, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
|
|
offset += 2;
|
|
|
|
/* Generation ID */
|
|
proto_tree_add_uint(parent_tree, hf_genid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
|
|
offset += 2;
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
static int
|
|
dissect_msnip_gm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
|
|
{
|
|
guint8 count;
|
|
|
|
/* group count */
|
|
count = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
|
|
offset += 1;
|
|
|
|
/* checksum */
|
|
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
|
|
offset += 2;
|
|
|
|
/* holdtime */
|
|
proto_tree_add_uint(parent_tree, hf_holdtime, tvb, offset, 4, count);
|
|
offset += 4;
|
|
|
|
while (count--) {
|
|
proto_tree *tree;
|
|
proto_item *item;
|
|
guint32 maddr;
|
|
guint8 masklen;
|
|
int old_offset = offset;
|
|
|
|
item = proto_tree_add_item(parent_tree, hf_groups,
|
|
tvb, offset, -1, FALSE);
|
|
tree = proto_item_add_subtree(item, ett_groups);
|
|
|
|
/* multicast group */
|
|
tvb_memcpy(tvb, (guint8 *)&maddr, offset, 4);
|
|
proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
|
|
maddr);
|
|
offset += 4;
|
|
|
|
/* mask length */
|
|
masklen = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_mask, tvb,
|
|
offset, 1, masklen);
|
|
offset += 1;
|
|
|
|
/* skip 3 unused bytes */
|
|
offset += 3;
|
|
|
|
if (item) {
|
|
proto_item_set_text(item,"Group: %s/%d",
|
|
ip_to_str((guint8 *)&maddr), masklen);
|
|
|
|
proto_item_set_len(item, offset-old_offset);
|
|
}
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
/* This function is only called from the IGMP dissector */
|
|
int
|
|
dissect_msnip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
|
|
{
|
|
proto_tree *tree;
|
|
proto_item *item;
|
|
guint8 type;
|
|
|
|
if (!proto_is_protocol_enabled(proto_msnip)) {
|
|
/* we are not enabled, skip entire packet to be nice
|
|
to the igmp layer. (so clicking on IGMP will display the data)
|
|
*/
|
|
return offset+tvb_length_remaining(tvb, offset);
|
|
}
|
|
|
|
item = proto_tree_add_item(parent_tree, proto_msnip, tvb, offset, -1, FALSE);
|
|
tree = proto_item_add_subtree(item, ett_msnip);
|
|
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MSNIP");
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
}
|
|
|
|
|
|
type = tvb_get_guint8(tvb, offset);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s",val_to_str(type, msnip_types,
|
|
"Unknown Type:0x%02x"));
|
|
}
|
|
|
|
/* type of command */
|
|
proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
|
|
offset += 1;
|
|
|
|
switch (type) {
|
|
case MSNIP_GM:
|
|
offset = dissect_msnip_gm(tvb, pinfo, tree, offset);
|
|
break;
|
|
case MSNIP_IS:
|
|
offset = dissect_msnip_is(tvb, pinfo, tree, offset);
|
|
break;
|
|
case MSNIP_RMR:
|
|
offset = dissect_msnip_rmr(tvb, pinfo, tree, offset);
|
|
break;
|
|
}
|
|
|
|
if (item) {
|
|
proto_item_set_len(item, offset);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
|
|
void
|
|
proto_register_msnip(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_type,
|
|
{ "Type", "msnip.type", FT_UINT8, BASE_HEX,
|
|
VALS(msnip_types), 0, "MSNIP Packet Type", HFILL }},
|
|
|
|
{ &hf_checksum,
|
|
{ "Checksum", "msnip.checksum", FT_UINT16, BASE_HEX,
|
|
NULL, 0, "MSNIP Checksum", HFILL }},
|
|
|
|
{ &hf_checksum_bad,
|
|
{ "Bad Checksum", "msnip.checksum_bad", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0, "Bad MSNIP Checksum", HFILL }},
|
|
|
|
{ &hf_count,
|
|
{ "Count", "msnip.count", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "MSNIP Number of groups", HFILL }},
|
|
|
|
{ &hf_holdtime,
|
|
{ "Holdtime", "msnip.holdtime", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "MSNIP Holdtime in seconds", HFILL }},
|
|
|
|
{ &hf_groups,
|
|
{ "Groups", "msnip.groups", FT_NONE, BASE_NONE,
|
|
NULL, 0, "MSNIP Groups", HFILL }},
|
|
|
|
{ &hf_maddr,
|
|
{ "Multicast group", "msnip.maddr", FT_IPv4, BASE_NONE,
|
|
NULL, 0, "MSNIP Multicast Group", HFILL }},
|
|
|
|
{ &hf_mask,
|
|
{ "Netmask", "msnip.netmask", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "MSNIP Netmask", HFILL }},
|
|
|
|
{ &hf_holdtime16,
|
|
{ "Holdtime", "msnip.holdtime16", FT_UINT16, BASE_DEC,
|
|
NULL, 0, "MSNIP Holdtime in seconds", HFILL }},
|
|
|
|
{ &hf_genid,
|
|
{ "Generation ID", "msnip.genid", FT_UINT16, BASE_DEC,
|
|
NULL, 0, "MSNIP Generation ID", HFILL }},
|
|
|
|
{ &hf_rec_type,
|
|
{ "Record Type", "msnip.rec_type", FT_UINT8, BASE_DEC,
|
|
VALS(msnip_rec_types), 0, "MSNIP Record Type", HFILL }},
|
|
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_msnip,
|
|
&ett_groups,
|
|
};
|
|
|
|
proto_msnip = proto_register_protocol("MSNIP: Multicast Source Notification of Interest Protocol",
|
|
"MSNIP", "msnip");
|
|
proto_register_field_array(proto_msnip, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|