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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* non_tcp_udp.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-25 - ntop.org
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocol_ids.h"
#include "ndpi_api.h"
#include "ndpi_private.h"
#define set_protocol_and_bmask(nprot) \
{ \
if (NDPI_COMPARE_PROTOCOL_TO_BITMASK(ndpi_struct->detection_bitmask,nprot) != 0) \
{ \
ndpi_set_detected_protocol(ndpi_struct, flow, \
nprot, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI); \
} \
}
static void ndpi_search_in_non_tcp_udp(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
switch (flow->l4_proto) {
case NDPI_IPSEC_PROTOCOL_ESP:
case NDPI_IPSEC_PROTOCOL_AH:
set_protocol_and_bmask(NDPI_PROTOCOL_IPSEC);
break;
case NDPI_GRE_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_GRE);
break;
case NDPI_ICMP_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_ICMP);
if(packet->payload_packet_len < sizeof(struct ndpi_icmphdr)) {
char buf[64];
snprintf(buf, sizeof(buf), "Packet too short (%d vs %u)",
packet->payload_packet_len, (unsigned int)sizeof(struct ndpi_icmphdr));
ndpi_set_risk(ndpi_struct, flow, NDPI_MALFORMED_PACKET, buf);
} else {
u_int8_t icmp_type = (u_int8_t)packet->payload[0];
u_int8_t icmp_code = (u_int8_t)packet->payload[1];
/* https://www.iana.org/assignments/icmp-parameters/icmp-parameters.xhtml */
if(((icmp_type >= 44) && (icmp_type <= 252))
|| (icmp_code > 15)) {
char buf[64];
snprintf(buf, sizeof(buf), "Invalid type (%u)/code(%u)",
icmp_type, icmp_code);
ndpi_set_risk(ndpi_struct, flow, NDPI_MALFORMED_PACKET, buf);
}
if(packet->payload_packet_len > sizeof(struct ndpi_icmphdr)) {
if(ndpi_struct->cfg.compute_entropy && (flow->skip_entropy_check == 0)) {
flow->entropy = ndpi_entropy(packet->payload + sizeof(struct ndpi_icmphdr),
packet->payload_packet_len - sizeof(struct ndpi_icmphdr));
ndpi_entropy2risk(ndpi_struct, flow);
}
u_int16_t chksm = icmp4_checksum(packet->payload, packet->payload_packet_len);
if(chksm) {
ndpi_set_risk(ndpi_struct, flow, NDPI_MALFORMED_PACKET, "Invalid ICMP checksum");
}
}
}
break;
case NDPI_IGMP_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_IGMP);
break;
case NDPI_EGP_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_EGP);
break;
case NDPI_SCTP_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_SCTP);
break;
case NDPI_PGM_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_PGM);
break;
case NDPI_OSPF_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_OSPF);
break;
case NDPI_IPIP_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_IP_IN_IP);
break;
case NDPI_ICMPV6_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_ICMPV6);
if(packet->payload_packet_len < sizeof(struct ndpi_icmp6hdr)) {
char buf[64];
snprintf(buf, sizeof(buf), "Packet too short (%d vs %u)",
packet->payload_packet_len, (unsigned int)sizeof(struct ndpi_icmp6hdr));
ndpi_set_risk(ndpi_struct, flow, NDPI_MALFORMED_PACKET, buf);
} else {
u_int8_t icmp6_type = (u_int8_t)packet->payload[0];
u_int8_t icmp6_code = (u_int8_t)packet->payload[1];
/* https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol_for_IPv6 */
if(((icmp6_type >= 5) && (icmp6_type <= 127))
|| ((icmp6_code >= 156) && (icmp6_type != 255))) {
char buf[64];
snprintf(buf, sizeof(buf), "Invalid type (%u)/code(%u)",
icmp6_type, icmp6_code);
ndpi_set_risk(ndpi_struct, flow, NDPI_MALFORMED_PACKET, buf);
}
}
break;
case NDPI_PIM_PROTOCOL_TYPE:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_PIM);
break;
case 112:
set_protocol_and_bmask(NDPI_PROTOCOL_IP_VRRP);
break;
}
}
void init_non_tcp_udp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
/* always add non tcp/udp if one protocol is compiled in */
NDPI_SAVE_AS_BITMASK(ndpi_struct->callback_buffer[*id].detection_bitmask, NDPI_PROTOCOL_UNKNOWN);
ndpi_set_bitmask_protocol_detection("IPSec", ndpi_struct, *id,
NDPI_PROTOCOL_IPSEC,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_GRE", ndpi_struct, *id,
NDPI_PROTOCOL_IP_GRE,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_ICMP", ndpi_struct, *id,
NDPI_PROTOCOL_IP_ICMP,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_IGMP", ndpi_struct, *id,
NDPI_PROTOCOL_IP_IGMP,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_EGP", ndpi_struct, *id,
NDPI_PROTOCOL_IP_EGP,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_SCTP", ndpi_struct, *id,
NDPI_PROTOCOL_IP_SCTP,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_PGM", ndpi_struct, *id,
NDPI_PROTOCOL_IP_PGM,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_OSPF", ndpi_struct, *id,
NDPI_PROTOCOL_IP_OSPF,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_IP_IN_IP", ndpi_struct, *id,
NDPI_PROTOCOL_IP_IP_IN_IP,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_ICMPV6", ndpi_struct, *id,
NDPI_PROTOCOL_IP_ICMPV6,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
ndpi_set_bitmask_protocol_detection("IP_PIM", ndpi_struct, *id,
NDPI_PROTOCOL_IP_PIM,
ndpi_search_in_non_tcp_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_IPV4_OR_IPV6,
NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|