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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/* packet-li5g.c
* Routines for ETSI TS 103 221-2 V1.1.1 (2019-03), Internal Network Interface X2/X3 for Lawful Interception
* Roy Zhang <roy.zhang@nokia-sbell.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
void proto_reg_handoff_li5g(void);
void proto_register_li5g(void);
static int proto_li5g = -1;
static int hf_li5g_version = -1;
static int hf_li5g_pduType = -1;
static int hf_li5g_headerLen = -1;
static int hf_li5g_payloadLen = -1;
static int hf_li5g_payloadFormart = -1;
static int hf_li5g_payloadDirection = -1;
static int hf_li5g_xid = -1;
static int hf_li5g_cid = -1;
static int hf_li5g_attrType = -1;
static int hf_li5g_attrLen = -1;
static int hf_li5g_pld = -1;
/* the min Attribute Type is 1 */
#define LI_5G_ATTR_TYPE_MAX 19
/* the min header length */
#define LI_5G_HEADER_LEN_MIN 40
/* 13 payload format */
#define LI_5G_PAYLOAD_FORMAT_MAX 14
static gint ett_li5g = -1;
static gint ett_attrContents[LI_5G_ATTR_TYPE_MAX];
static int hf_li5g_attrContents[LI_5G_ATTR_TYPE_MAX];
static dissector_handle_t li5g_handle;
static dissector_handle_t subProtocol_handle[LI_5G_PAYLOAD_FORMAT_MAX]={NULL};
static gchar* pdu_info_str[] = {
"",
"x2 xIRI",
"x3 CC",
"Keepalive",
"Keepalive Acknowledgement"
};
static int
dissect_li5g(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *li5g_tree, *attr_tree, *parent=NULL;
proto_item *ti, *attr_ti;
int offset = LI_5G_HEADER_LEN_MIN, hf_attr = -1;
guint32 headerLen, payloadLen;
guint16 pduType, payloadFormart, attrType, attrLen;
address src_addr;
address dst_addr;
guint32 src_port;
guint32 dst_port;
pduType = tvb_get_ntohs(tvb, 2);
headerLen = tvb_get_ntohl(tvb, 4);
payloadLen = tvb_get_ntohl(tvb, 8);
payloadFormart = tvb_get_ntohs(tvb, 12);
ti = proto_tree_add_item(tree, proto_li5g, tvb, 0, headerLen+payloadLen, ENC_NA);
li5g_tree = proto_item_add_subtree(ti, ett_li5g);
proto_tree_add_item(li5g_tree, hf_li5g_version, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_pduType, tvb, 2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_headerLen, tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_payloadLen, tvb, 8, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_payloadFormart, tvb, 12, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_payloadDirection, tvb, 14, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(li5g_tree, hf_li5g_xid, tvb, 16, 16, ENC_NA);
proto_tree_add_item(li5g_tree, hf_li5g_cid, tvb, 32, 8, ENC_NA);
/* Get the Conditional Attribute */
while(headerLen - offset > 0){
attrType = tvb_get_ntohs(tvb, offset);
attrLen = tvb_get_ntohs(tvb, offset+2);
/* The first 4 types not supporting now */
if (attrType > 4 && attrType < LI_5G_ATTR_TYPE_MAX){
hf_attr = hf_li5g_attrContents[attrType];
attr_ti = proto_tree_add_item(li5g_tree, hf_attr, tvb, offset+4, attrLen, ENC_NA);
attr_tree = proto_item_add_subtree(attr_ti, ett_attrContents[attrType]);
proto_tree_add_item(attr_tree, hf_li5g_attrType, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(attr_tree, hf_li5g_attrLen, tvb, offset+2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(attr_tree, hf_attr, tvb, offset+4, attrLen, ENC_BIG_ENDIAN);
}
offset = offset + 4 + attrLen;
}
proto_tree_add_item(li5g_tree, hf_li5g_pld, tvb, headerLen, payloadLen, ENC_NA);
/* the key is address+port+frame_num for reassemble list, the address/port can be changed in pinfo because of the inner TCP protocol */
copy_address_shallow(&src_addr, &pinfo->src);
copy_address_shallow(&dst_addr, &pinfo->dst);
src_port = pinfo->srcport;
dst_port = pinfo->destport;
/* to make all the sub protocol(such as DNS) under li5g*/
if (li5g_tree && li5g_tree->parent){
parent=li5g_tree->parent;
li5g_tree->parent=NULL;
}
if (subProtocol_handle[payloadFormart])
call_dissector(subProtocol_handle[payloadFormart], tvb_new_subset_length(tvb, offset, payloadLen), pinfo, li5g_tree);
if (parent)
li5g_tree->parent=parent;
/* have another li5g in the same packet? */
if (tvb_captured_length(tvb)>offset+payloadLen)
dissect_li5g(tvb_new_subset_remaining(tvb, offset+payloadLen), pinfo, tree, NULL);
/* set these info at the end*/
col_set_str(pinfo->cinfo, COL_PROTOCOL, "5GLI");
col_clear_fence(pinfo->cinfo, COL_INFO);
col_clear(pinfo->cinfo, COL_INFO);
if (pduType <= 4)
col_set_str(pinfo->cinfo, COL_INFO, pdu_info_str[pduType]);
/* copy back to the original value when return from innner protocol */
copy_address_shallow(&pinfo->src, &src_addr);
copy_address_shallow(&pinfo->dst, &dst_addr);
pinfo->srcport = src_port;
pinfo->destport = dst_port;
return tvb_captured_length(tvb);
}
static gboolean
dissect_li5g_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
if (tvb_captured_length(tvb) < LI_5G_HEADER_LEN_MIN)
return FALSE;
/* the version should be 1 */
if (tvb_get_ntohs(tvb, 0) != 1)
return FALSE;
/* only 4 types supported*/
if(tvb_get_ntohs(tvb, 2) < 1 || tvb_get_ntohs(tvb, 2) > 4)
return (FALSE);
/* TLS can hold it, no need to find the disect every time */
*(dissector_handle_t *)data = li5g_handle;
dissect_li5g(tvb, pinfo, tree, data);
return TRUE;
}
void
proto_register_li5g(void)
{
memset(ett_attrContents, -1, sizeof(ett_attrContents));
memset(hf_li5g_attrContents, -1, sizeof(hf_li5g_attrContents));
static hf_register_info hf[] = {
{ &hf_li5g_version, { "Version", "li5g.ver", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_pduType, { "PDU Type", "li5g.type", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_headerLen, { "Header Length", "li5g.hl", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_payloadLen, { "Payload Length", "li5g.pl", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_payloadFormart, { "Payload Formart", "li5g.pf", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_payloadDirection, { "Payload Direction", "li5g.pd", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_xid, { "XID", "li5g.xid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_cid, { "Correlation ID", "li5g.cid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrType, { "Attribute Type", "li5g.attrType", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrLen, { "Attribute Length", "li5g.attrLen", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[5], { "Domain ID", "li5g.did", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[6], { "Network Function ID", "li5g.nfid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[7], { "Interception Point ID", "li5g.ipid", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[8], { "Sequence Number", "li5g.sq", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[9], { "Timestamp", "li5g.ts", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[10], { "Source IPv4 address", "li5g.srcip", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[11], { "Destination IPv4 address", "li5g.dstip", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[12], { "Source IPv6 address", "li5g.srcipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[13], { "Destination IPv6 address", "li5g.dstipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[14], { "Source Port", "li5g.srcport", FT_UINT16, BASE_PT_TCP, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[15], { "Destination Port", "li5g.dstport", FT_UINT16, BASE_PT_TCP, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[16], { "IP Protocol", "li5g.ipproto", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[17], { "Matched Target Identifier", "li5g.mti", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_attrContents[18], { "Other Target Identifier", "li5g.oti", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_li5g_pld, { "Payload", "li5g.pld", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_li5g,
&ett_attrContents[5],
&ett_attrContents[6],
&ett_attrContents[7],
&ett_attrContents[8],
&ett_attrContents[9],
&ett_attrContents[10],
&ett_attrContents[11],
&ett_attrContents[12],
&ett_attrContents[13],
&ett_attrContents[14],
&ett_attrContents[15],
&ett_attrContents[16],
&ett_attrContents[17],
&ett_attrContents[18],
};
proto_li5g = proto_register_protocol("5G Lawful Interception", "5GLI", "5gli");
proto_register_field_array(proto_li5g, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_li5g(void)
{
subProtocol_handle[2]=find_dissector_add_dependency("xiri", proto_li5g);
subProtocol_handle[5]=find_dissector("ip");
subProtocol_handle[6]=find_dissector("ipv6");
subProtocol_handle[7]=find_dissector("eth");
subProtocol_handle[8]=find_dissector("rtp");
subProtocol_handle[9]=find_dissector("sip");
subProtocol_handle[10]=find_dissector("dhcp");
subProtocol_handle[11]=find_dissector("radius");
subProtocol_handle[12]=find_dissector("gtp");
subProtocol_handle[13]=find_dissector("msrp");
li5g_handle = register_dissector("li5g", dissect_li5g, proto_li5g);
dissector_add_uint_range_with_preference("tcp.port", "", li5g_handle);
heur_dissector_add("tls", dissect_li5g_heur, "5G LI over TLS", "li5g_tls", proto_li5g, HEURISTIC_ENABLE);
}
|