nexmon – Rev 1
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/* packet-ripng.c
* Routines for RIPng disassembly
* (c) Copyright Jun-ichiro itojun Hagino <itojun@itojun.org>
* derived from packet-rip.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Enhance RIPng by Alexis La Goutte
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* References:
* RFC2080: RIPng for IPv6
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/to_str.h>
void proto_register_ripng(void);
void proto_reg_handoff_ripng(void);
static int proto_ripng = -1;
static int hf_ripng_cmd = -1;
static int hf_ripng_version = -1;
static int hf_ripng_reserved = -1;
static int hf_ripng_rte = -1;
static int hf_ripng_rte_ipv6_prefix = -1;
static int hf_ripng_rte_route_tag = -1;
static int hf_ripng_rte_prefix_length = -1;
static int hf_ripng_rte_metric = -1;
static gint ett_ripng = -1;
static gint ett_ripng_rte = -1;
#define UDP_PORT_RIPNG 521
#define RIP6_REQUEST 1
#define RIP6_RESPONSE 2
static const value_string cmdvals[] = {
{ RIP6_REQUEST, "Request" },
{ RIP6_RESPONSE, "Response" },
{ 0, NULL },
};
static int
dissect_ripng(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) {
int offset = 0;
proto_tree *ripng_tree = NULL, *rte_tree = NULL;
proto_item *ti, *rte_ti;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIPng");
col_add_fstr(pinfo->cinfo, COL_INFO," Command %s, Version %u",
val_to_str(tvb_get_guint8(tvb, offset), cmdvals, "Unknown (%u)"),
tvb_get_guint8(tvb, offset +1));
if (tree) {
ti = proto_tree_add_item(tree, proto_ripng, tvb, offset, -1, ENC_NA);
ripng_tree = proto_item_add_subtree(ti, ett_ripng);
/* Command */
proto_tree_add_item(ripng_tree, hf_ripng_cmd, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Version */
proto_tree_add_item(ripng_tree, hf_ripng_version, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Reserved */
proto_tree_add_item(ripng_tree, hf_ripng_reserved, tvb, offset, 2, ENC_NA);
offset += 2;
/* Route Table Entry */
while (tvb_reported_length_remaining(tvb, offset) > 0) {
rte_ti = proto_tree_add_item(ripng_tree, hf_ripng_rte, tvb, offset, 16 + 2 + 1 + 1, ENC_NA);
rte_tree = proto_item_add_subtree(rte_ti, ett_ripng_rte);
/* IPv6 Prefix */
proto_tree_add_item(rte_tree, hf_ripng_rte_ipv6_prefix, tvb, offset, 16, ENC_NA);
proto_item_append_text(rte_ti, ": IPv6 Prefix: %s", tvb_ip6_to_str(tvb, offset));
offset += 16;
/* Route Tag */
proto_tree_add_item(rte_tree, hf_ripng_rte_route_tag, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* Prefix Length */
proto_tree_add_item(rte_tree, hf_ripng_rte_prefix_length, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_item_append_text(rte_ti, "/%u", tvb_get_guint8(tvb, offset));
offset += 1;
/* Metric */
proto_tree_add_item(rte_tree, hf_ripng_rte_metric, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_item_append_text(rte_ti, " Metric: %u", tvb_get_guint8(tvb, offset));
offset += 1;
}
}
return tvb_captured_length(tvb);
}
void
proto_register_ripng(void)
{
static hf_register_info hf[] = {
{ &hf_ripng_cmd,
{ "Command", "ripng.cmd",
FT_UINT8, BASE_DEC, VALS(cmdvals), 0x0,
"Used to specify the purpose of this message", HFILL }},
{ &hf_ripng_version,
{ "Version", "ripng.version",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Version of RIPng", HFILL }},
{ &hf_ripng_reserved,
{ "Reserved", "ripng.reserved",
FT_BYTES, BASE_NONE, NULL, 0x0,
"Must be Zero", HFILL }},
{ &hf_ripng_rte,
{ "Route Table Entry", "ripng.rte",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_ripng_rte_ipv6_prefix,
{ "IPv6 Prefix", "ripng.rte.ipv6_prefix",
FT_IPv6, BASE_NONE, NULL, 0x0,
"Destination", HFILL }},
{ &hf_ripng_rte_route_tag,
{ "Route Tag", "ripng.rte.route_tag",
FT_UINT16, BASE_HEX, NULL, 0x0,
"Provides a method of separating internal RIPng routes (routes for networks within the RIPng routing domain) from external RIPng routes, which may have been imported from an EGP or another IGP", HFILL }},
{ &hf_ripng_rte_prefix_length,
{ "Prefix Length", "ripng.rte.prefix_length",
FT_UINT8, BASE_DEC, NULL, 0x0,
"The length in bits of the significant part of the prefix starting from the left of the prefix", HFILL }},
{ &hf_ripng_rte_metric,
{ "Metric", "ripng.rte.metric",
FT_UINT8, BASE_DEC, NULL, 0x0,
"The current metric for the destination; the value 16 (infinity) indicates that the destination is not reachable", HFILL }},
};
static gint *ett[] = {
&ett_ripng,
&ett_ripng_rte,
};
proto_ripng = proto_register_protocol("RIPng", "RIPng", "ripng");
proto_register_field_array(proto_ripng, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_ripng(void)
{
dissector_handle_t ripng_handle;
ripng_handle = create_dissector_handle(dissect_ripng, proto_ripng);
dissector_add_uint("udp.port", UDP_PORT_RIPNG, ripng_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/