1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/* 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
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* 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 dissector_handle_t ripng_handle;
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(pinfo->pool, 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));
ripng_handle = register_dissector("ripng", dissect_ripng, proto_ripng);
}
void
proto_reg_handoff_ripng(void)
{
dissector_add_uint_with_preference("udp.port", UDP_PORT_RIPNG, ripng_handle);
}
/*
* Editor modelines - https://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:
*/
|
