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|
/* packet-glbp.c
*
* Cisco's GLBP: Gateway Load Balancing Protocol
*
* $Id$
*
* Copyright 2007 Joerg Mayer (see AUTHORS file)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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.
*/
/*
* Documentation:
* http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.pdf
*
* TODO: This dissector has been written without specs, so much of it is
* guesswork. Candidate values that might be somewhere in the packet:
* - weight (current/lower/upper)
* - group#
* - forwarder#
* - preempt (capable/delay)
* - vg state
* - vf state
* - authentication
* - ipv6 support
* - sso capable
* - secondary IP addresses
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
static int proto_glbp = -1;
/* glbp header? */
static gint hf_glbp_version = -1;
static gint hf_glbp_type1 = -1;
static gint hf_glbp_unknown1 = -1;
static gint hf_glbp_unknown2 = -1;
static gint hf_glbp_somemac = -1;
static gint hf_glbp_type2 = -1;
static gint hf_glbp_length2 = -1;
/* glbp type2 = 1 - hello */
static gint hf_glbp_unknown11 = -1;
static gint hf_glbp_priority = -1;
static gint hf_glbp_unknown12 = -1;
static gint hf_glbp_helloint = -1;
static gint hf_glbp_holdint = -1;
static gint hf_glbp_redirect = -1;
static gint hf_glbp_timeout = -1;
static gint hf_glbp_unknown13 = -1;
static gint hf_glbp_numips = -1;
static gint hf_glbp_lenip = -1;
static gint hf_glbp_virtualip = -1;
/* glbp type2 = 2 - Request/Response??? */
static gint hf_glbp_subtype = -1;
static gint hf_glbp_unknown21 = -1;
static gint hf_glbp_virtualmac = -1;
/* unknown type */
static gint hf_glbp_unknown6 = -1;
static gint ett_glbp = -1;
static const value_string glbp_type2_vals[] = {
{ 1, "Hello" },
{ 2, "Request/Response?" },
{ 0, NULL }
};
static const value_string glbp_subtype_vals[] = {
{ 0, "Request?" },
{ 2, "Response?" },
{ 0, NULL }
};
#if 0
static const value_string glbp_loadbalancing_vals[] = {
{ x, "None (AVG only)" },
{ x, "Weighted" },
{ x, "Host dependent" },
{ x, "Round robin" },
{ 0, NULL }
};
static const value_string glbp_authentication_vals[] = {
{ x, "None" },
{ x, "Plain text" },
{ x, "MD5" },
{ 0, NULL }
};
static const value_string glbp_vgstate_vals[] = {
{ x, "Active" },
{ x, "Standby" },
{ x, "Listen" },
{ x, "Initial" },
{ x, "Speak" },
{ x, "Disabled" },
{ 0, NULL }
};
static const value_string glbp_vfstate_vals[] = {
{ x, "Active" },
{ x, "Listen" },
{ x, "Initial" },
{ x, "Disabled" },
{ 0, NULL }
};
#endif
static int
dissect_glbp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *glbp_tree = NULL;
proto_item *ti = NULL;
guint32 type2;
guint32 length2;
type2 = tvb_get_guint8(tvb, 12);
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "GLBP");
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO, val_to_str(type2,
glbp_type2_vals, "Type 0x%02x"));
length2 = tvb_get_guint8(tvb, 13);
if (tree) {
ti = proto_tree_add_item(tree, proto_glbp, tvb, 0, -1, FALSE);
glbp_tree = proto_item_add_subtree(ti, ett_glbp);
/* glbp header? */
proto_tree_add_item(glbp_tree, hf_glbp_version, tvb, 0, 1, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_type1, tvb, 1, 1, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_unknown1, tvb, 2, 2, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_unknown2, tvb, 4, 2, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_somemac, tvb, 6, 6, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_type2, tvb, 12, 1, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_length2, tvb, 13, 1, FALSE);
switch(type2) {
case 1: /* Hello */
proto_tree_add_item(glbp_tree, hf_glbp_unknown11, tvb, 14, 3, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_priority, tvb, 17, 1, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_unknown12, tvb, 18, 2, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_helloint, tvb, 20, 4, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_holdint, tvb, 24, 4, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_redirect, tvb, 28, 2, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_timeout, tvb, 30, 2, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_unknown13, tvb, 32, 2, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_numips, tvb, 34, 1, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_lenip, tvb, 35, 1, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_virtualip, tvb, 36, 4, FALSE);
break;
case 2:
proto_tree_add_item(glbp_tree, hf_glbp_subtype, tvb, 14, 1, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_unknown21, tvb, 15, 11, FALSE);
proto_tree_add_item(glbp_tree, hf_glbp_virtualmac, tvb, 26, 6, FALSE);
break;
default:
proto_tree_add_item(glbp_tree, hf_glbp_unknown6, tvb, 14, length2-2, FALSE);
break;
}
}
return 12 + length2;
}
static gboolean
test_glbp(tvbuff_t *tvb, packet_info *pinfo)
{
guint32 type1;
if ( tvb_length(tvb) < 2)
return FALSE;
type1 = tvb_get_guint8(tvb, 1);
if (tvb_get_guint8(tvb, 0) != 1 /* version? */
|| type1 > 2
|| pinfo->srcport != pinfo->destport
#if 0 /* XXX */
|| type1 == 0 && pinfo->net_dst != ipv4:224.0.0.102
|| type1 == 0 && pinfo->dl_src != ether:c2-00-7c-b8-00-00
#endif
) {
return FALSE;
}
return TRUE;
}
static int
dissect_glbp_static(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
if ( !test_glbp(tvb, pinfo) ) {
return 0;
}
return dissect_glbp(tvb, pinfo, tree);
}
void
proto_register_glbp(void)
{
static hf_register_info hf[] = {
/* Header */
{ &hf_glbp_version,
{ "Version?", "glbp.version", FT_UINT8, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_type1,
{ "Type1???", "glbp.type1", FT_UINT8, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_unknown1,
{ "Unknown1", "glbp.unknown1", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_unknown2,
{ "Unknown2", "glbp.unknown2", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_somemac,
{ "Somemac?", "glbp.somemac", FT_ETHER, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_type2,
{ "Type2???", "glbp.type2", FT_UINT8, BASE_DEC, VALS(glbp_type2_vals),
0x0, NULL, HFILL }},
{ &hf_glbp_length2,
{ "Length2?", "glbp.length2", FT_UINT8, BASE_DEC, NULL,
0x0, NULL, HFILL }},
/* type = 1 - hello */
{ &hf_glbp_unknown11,
{ "Unknown1-1", "glbp.unknown11", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_priority,
{ "Priority", "glbp.priority", FT_UINT8, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_unknown12,
{ "Unknown1-2", "glbp.unknown12", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_helloint,
{ "Helloint", "glbp.helloint", FT_UINT32, BASE_DEC, NULL,
0x0, "Hello interval [msec]", HFILL }},
{ &hf_glbp_holdint,
{ "Holdint", "glbp.holdint", FT_UINT32, BASE_DEC, NULL,
0x0, "Hold interval [msec]", HFILL }},
{ &hf_glbp_redirect,
{ "Redirect", "glbp.redirect", FT_UINT16, BASE_DEC, NULL,
0x0, "Redirect interval [sec]", HFILL }},
{ &hf_glbp_timeout,
{ "Timeout", "glbp.timeout", FT_UINT16, BASE_DEC, NULL,
0x0, "Forwarder timeout interval [sec]", HFILL }},
{ &hf_glbp_unknown13,
{ "Unknown1-3", "glbp.unknown13", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_numips,
{ "Number IPs???", "glbp.numips", FT_UINT8, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_lenip,
{ "Length IP???", "glbp.lenip", FT_UINT8, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_virtualip,
{ "Virtual IP", "glbp.virtualip", FT_IPv4, BASE_NONE, NULL,
0x0, NULL, HFILL }},
/* type = 2 - request/response??? */
{ &hf_glbp_subtype,
{ "Subtype???", "glbp.subtype", FT_UINT8, BASE_DEC, VALS(glbp_subtype_vals),
0x0, NULL, HFILL }},
{ &hf_glbp_unknown21,
{ "Unknown2-1", "glbp.unknown21", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_glbp_virtualmac,
{ "Virtualmac", "glbp.virtualmac", FT_ETHER, BASE_NONE, NULL,
0x0, NULL, HFILL }},
/* type = unknown */
{ &hf_glbp_unknown6,
{ "Unknown6", "glbp.unknown6", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_glbp,
};
proto_glbp = proto_register_protocol(
"Gateway Load Balancing Protocol", "GLBP", "glbp");
proto_register_field_array(proto_glbp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_glbp(void)
{
dissector_handle_t glbp_handle;
glbp_handle = new_create_dissector_handle(dissect_glbp_static, proto_glbp);
dissector_add("udp.port", 3222, glbp_handle);
}
|
