/src/ndpi/src/lib/protocols/vxlan.c
Line | Count | Source |
1 | | /* |
2 | | * vxlan.c |
3 | | * |
4 | | * Copyright (C) 2011-26 - ntop.org |
5 | | * |
6 | | * nDPI is free software: you can redistribute it and/or modify |
7 | | * it under the terms of the GNU Lesser General Public License as published by |
8 | | * the Free Software Foundation, either version 3 of the License, or |
9 | | * (at your option) any later version. |
10 | | * |
11 | | * nDPI is distributed in the hope that it will be useful, |
12 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | | * GNU Lesser General Public License for more details. |
15 | | * |
16 | | * You should have received a copy of the GNU Lesser General Public License |
17 | | * along with nDPI. If not, see <http://www.gnu.org/licenses/>. |
18 | | * |
19 | | */ |
20 | | |
21 | | #include "ndpi_protocol_ids.h" |
22 | | |
23 | | #define NDPI_CURRENT_PROTO NDPI_PROTOCOL_VXLAN |
24 | | |
25 | | #include "ndpi_api.h" |
26 | | #include "ndpi_private.h" |
27 | | |
28 | | /* This code handles VXLAN as per RFC 7348 */ |
29 | | |
30 | | static void ndpi_check_vxlan(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) |
31 | 0 | { |
32 | 0 | struct ndpi_packet_struct *packet = &ndpi_struct->packet; |
33 | |
|
34 | 0 | if(packet->payload_packet_len >= sizeof(struct ndpi_vxlanhdr)) { |
35 | | |
36 | | /* |
37 | | *rfc-7348 vxlan header |
38 | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
39 | | |R|R|R|R|I|R|R|R| Reserved | |
40 | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
41 | | | VXLAN Network Identifier (VNI) | Reserved | |
42 | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
43 | | */ |
44 | 0 | u_int32_t vxlan_dst_port = ntohs(4789); |
45 | 0 | struct ndpi_vxlanhdr *vxlanhdr = (struct ndpi_vxlanhdr *)packet->payload; |
46 | 0 | if((packet->udp->dest == vxlan_dst_port) && |
47 | 0 | (vxlanhdr->flags == ntohs(0x0800)) && |
48 | 0 | (vxlanhdr->groupPolicy == 0x0) && |
49 | 0 | (vxlanhdr->reserved == 0x0)) { |
50 | 0 | NDPI_LOG_INFO(ndpi_struct, "found vxlan\n"); |
51 | 0 | ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_VXLAN, NDPI_PROTOCOL_VXLAN, NDPI_CONFIDENCE_DPI); |
52 | 0 | return; |
53 | 0 | } |
54 | 0 | } |
55 | | |
56 | 0 | NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow); |
57 | 0 | return; |
58 | 0 | } |
59 | | |
60 | | static void ndpi_search_vxlan(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) |
61 | 0 | { |
62 | 0 | NDPI_LOG_DBG(ndpi_struct, "search vxlan\n"); |
63 | |
|
64 | 0 | ndpi_check_vxlan(ndpi_struct, flow); |
65 | 0 | } |
66 | | |
67 | | void init_vxlan_dissector(struct ndpi_detection_module_struct *ndpi_struct) |
68 | 0 | { |
69 | 0 | ndpi_register_dissector("VXLAN", ndpi_struct, |
70 | 0 | ndpi_search_vxlan, |
71 | 0 | NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD, |
72 | 0 | 1, NDPI_PROTOCOL_VXLAN); |
73 | 0 | } |