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add support for vxlan decapsulation (ntop#1441)
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@mmaatuq
mmaatuq committed Mar 13, 2023
1 parent d398f23 commit 0cae394
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Showing 2 changed files with 47 additions and 18 deletions.
28 changes: 28 additions & 0 deletions example/reader_util.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1744,6 +1744,30 @@ int ndpi_is_datalink_supported(int datalink_type) {
return 0;
}
}
struct vxlan_packet_header {
u_int8_t flags[4]; /* the first byte is flags, other three are reserved */
u_int8_t vni[4]; /* the first three bytes are VNI, the last byte is reserved */
};
static bool ndpi_is_valid_vxlan(const struct pcap_pkthdr *header, const u_char *packet, u_int16_t ip_offset, u_int16_t ip_len){
if(header->caplen >= ip_offset + ip_len + sizeof(struct vxlan_packet_header)) {
u_int32_t vxlan_dst_port = ntohs(4789);
u_int32_t expected_flags = 0x08; /* only one bit should be set in the first byte */
struct ndpi_udphdr *udp = (struct ndpi_udphdr *)&packet[ip_offset+ip_len];
u_int offset = ip_offset + ip_len + sizeof(struct ndpi_udphdr);
struct vxlan_packet_header *vxlan = (struct vxlan_packet_header *)&packet[offset];

if((udp->dest == vxlan_dst_port || udp->source == vxlan_dst_port) &&
(vxlan->flags[0] == expected_flags) && (vxlan->flags[1] == 0x0) &&
(vxlan->flags[2] == 0x0) && (vxlan->flags[3] == 0x0) &&
(vxlan->vni[3] == 0x0)) {
return true;
}
}
return false;
}
static int ndpi_skip_vxlan(u_int16_t ip_offset, u_int16_t ip_len){
return ip_offset + ip_len + sizeof(struct ndpi_udphdr) + sizeof(struct vxlan_packet_header);
}

/* ****************************************************** */

Expand Down Expand Up @@ -2243,6 +2267,10 @@ struct ndpi_proto ndpi_workflow_process_packet(struct ndpi_workflow * workflow,
}
}
}
}else if(ndpi_is_valid_vxlan(header, packet, ip_offset, ip_len)){
tunnel_type = ndpi_vxlan_tunnel;
eth_offset = ndpi_skip_vxlan(ip_offset, ip_len);
goto datalink_check;
}
}
}
Expand Down
37 changes: 19 additions & 18 deletions tests/result/vxlan.pcap.out
View file
Original file line number Diff line number Diff line change
@@ -1,8 +1,9 @@
Guessed flow protos: 0

DPI Packets (UDP): 9 (1.00 pkts/flow)
Confidence DPI : 9 (flows)
Num dissector calls: 9 (1.00 diss/flow)
DPI Packets (TCP): 12 (6.00 pkts/flow)
DPI Packets (UDP): 6 (3.00 pkts/flow)
Confidence DPI : 4 (flows)
Num dissector calls: 4 (1.00 diss/flow)
LRU cache ookla: 0/0/0 (insert/search/found)
LRU cache bittorrent: 0/0/0 (insert/search/found)
LRU cache zoom: 0/0/0 (insert/search/found)
Expand All @@ -11,23 +12,23 @@ LRU cache tls_cert: 0/0/0 (insert/search/found)
LRU cache mining: 0/0/0 (insert/search/found)
LRU cache msteams: 0/0/0 (insert/search/found)
LRU cache stun_zoom: 0/0/0 (insert/search/found)
Automa host: 0/0 (search/found)
Automa domain: 0/0 (search/found)
Automa host: 8/8 (search/found)
Automa domain: 8/0 (search/found)
Automa tls cert: 0/0 (search/found)
Automa risk mask: 0/0 (search/found)
Automa risk mask: 2/0 (search/found)
Automa common alpns: 0/0 (search/found)
Patricia risk mask: 18/0 (search/found)
Patricia risk mask: 8/0 (search/found)
Patricia risk: 0/0 (search/found)
Patricia protocols: 18/0 (search/found)
Patricia protocols: 4/4 (search/found)

VXLAN 127 85322 9
Facebook 127 85322 4

1 UDP 192.168.22.5:36286 -> 192.168.22.4:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][56 pkts/71223 bytes -> 0 pkts/0 bytes][Goodput ratio: 96/0][0.34 sec][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 3/0 113/0 16/0][Pkt Len c2s/s2c min/avg/max/stddev: 120/0 1272/0 1500/0 477/0][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][PLAIN TEXT (Ev0@ED)][Plen Bins: 0,0,10,0,0,0,0,1,0,0,0,0,0,0,0,0,3,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,83,0,0]
2 UDP 192.168.22.5:60230 -> 192.168.22.4:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][13 pkts/5656 bytes -> 0 pkts/0 bytes][Goodput ratio: 89/0][0.38 sec][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 34/0 233/0 70/0][Pkt Len c2s/s2c min/avg/max/stddev: 120/0 435/0 1500/0 497/0][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][Plen Bins: 0,0,55,7,0,0,0,7,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15,0,0]
3 UDP 192.168.22.4:40646 -> 192.168.22.5:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][35 pkts/4938 bytes -> 0 pkts/0 bytes][Goodput ratio: 67/0][0.34 sec][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 11/0 150/0 30/0][Pkt Len c2s/s2c min/avg/max/stddev: 120/0 141/0 438/0 66/0][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][PLAIN TEXT (www.facebook.com)][Plen Bins: 0,0,91,0,2,0,0,2,2,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
4 UDP 192.168.22.4:49762 -> 192.168.22.5:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][12 pkts/2011 bytes -> 0 pkts/0 bytes][Goodput ratio: 73/0][0.38 sec][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 15/0 81/0 25/0][Pkt Len c2s/s2c min/avg/max/stddev: 120/0 168/0 434/0 92/0][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][PLAIN TEXT (facebook.com)][Plen Bins: 0,0,67,8,8,0,0,8,0,0,0,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
5 UDP 192.168.22.5:50251 -> 192.168.22.4:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][2 pkts/362 bytes -> 0 pkts/0 bytes][Goodput ratio: 74/0][0.03 sec][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][PLAIN TEXT (facebook)][Plen Bins: 0,0,0,0,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
6 UDP 192.168.22.4:60230 -> 192.168.22.5:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][3 pkts/324 bytes -> 0 pkts/0 bytes][Goodput ratio: 57/0][< 1 sec][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][Plen Bins: 0,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
7 UDP 192.168.22.5:43866 -> 192.168.22.4:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][2 pkts/296 bytes -> 0 pkts/0 bytes][Goodput ratio: 69/0][0.03 sec][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][PLAIN TEXT (facebook)][Plen Bins: 0,0,0,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
8 UDP 192.168.22.4:60351 -> 192.168.22.5:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][2 pkts/260 bytes -> 0 pkts/0 bytes][Goodput ratio: 64/0][< 1 sec][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][PLAIN TEXT (facebook)][Plen Bins: 0,0,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
9 UDP 192.168.22.4:60887 -> 192.168.22.5:4789 [VLAN: 5][proto: 64/VXLAN][IP: 0/Unknown][ClearText][Confidence: DPI][DPI packets: 1][cat: Network/14][2 pkts/252 bytes -> 0 pkts/0 bytes][Goodput ratio: 63/0][< 1 sec][Risk: ** Unidirectional Traffic **][Risk Score: 10][Risk Info: No server to client traffic][PLAIN TEXT (facebook)][Plen Bins: 0,0,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
JA3 Host Stats:
IP Address # JA3C
1 10.10.20.4 1


1 TCP 10.10.20.4:45228 <-> 157.240.224.35:443 [VLAN: 5][proto: VXLAN:91.119/TLS.Facebook][IP: 119/Facebook][Encrypted][Confidence: DPI][DPI packets: 6][cat: SocialNetwork/6][35 pkts/4938 bytes <-> 56 pkts/71223 bytes][Goodput ratio: 15/91][0.34 sec][Hostname/SNI: www.facebook.com][TLS Supported Versions: TLSv1.3;TLSv1.2;TLSv1.1;TLSv1][bytes ratio: -0.870 (Download)][IAT c2s/s2c min/avg/max/stddev: 0/0 7/6 81/140 17/26][Pkt Len c2s/s2c min/avg/max/stddev: 120/120 141/1272 438/1500 66/477][Risk: ** TLS (probably) Not Carrying HTTPS **** Malicious JA3 Fingerp. **][Risk Score: 60][Risk Info: 40adfd923eb82b89d8836ba37a19bca1 / No ALPN][TLSv1.3][JA3C: 40adfd923eb82b89d8836ba37a19bca1][JA3S: 475c9302dc42b2751db9edcac3b74891][Firefox][Cipher: TLS_CHACHA20_POLY1305_SHA256][Plen Bins: 0,0,1,0,0,5,0,0,0,1,0,0,0,0,3,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,87,0,0,0,0]
2 TCP 10.10.20.4:45226 <-> 157.240.224.35:443 [VLAN: 5][proto: VXLAN:91.119/TLS.Facebook][IP: 119/Facebook][Encrypted][Confidence: DPI][DPI packets: 6][cat: SocialNetwork/6][15 pkts/2335 bytes <-> 13 pkts/5656 bytes][Goodput ratio: 24/72][0.38 sec][Hostname/SNI: facebook.com][TLS Supported Versions: TLSv1.3;TLSv1.2;TLSv1.1;TLSv1][bytes ratio: -0.416 (Download)][IAT c2s/s2c min/avg/max/stddev: 0/0 32/15 224/113 62/35][Pkt Len c2s/s2c min/avg/max/stddev: 108/120 156/435 434/1500 86/497][Risk: ** TLS (probably) Not Carrying HTTPS **** Malicious JA3 Fingerp. **][Risk Score: 60][Risk Info: 40adfd923eb82b89d8836ba37a19bca1 / No ALPN][TLSv1.3][JA3C: 40adfd923eb82b89d8836ba37a19bca1][JA3S: 475c9302dc42b2751db9edcac3b74891][Firefox][Cipher: TLS_CHACHA20_POLY1305_SHA256][Plen Bins: 20,0,10,0,0,20,0,0,0,10,0,0,0,0,10,0,0,0,0,0,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,20,0,0,0,0]
3 UDP 10.10.20.4:32860 <-> 8.8.8.8:53 [VLAN: 5][proto: VXLAN:5.119/DNS.Facebook][IP: 126/Google][ClearText][Confidence: DPI][DPI packets: 3][cat: Network/14][2 pkts/260 bytes <-> 2 pkts/362 bytes][Goodput ratio: 26/47][0.07 sec][Hostname/SNI: www.facebook.com][157.240.224.35][PLAIN TEXT (facebook)][Plen Bins: 0,50,50,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
4 UDP 10.10.20.4:44437 <-> 8.8.8.8:53 [VLAN: 5][proto: VXLAN:5.119/DNS.Facebook][IP: 126/Google][ClearText][Confidence: DPI][DPI packets: 3][cat: Network/14][2 pkts/252 bytes <-> 2 pkts/296 bytes][Goodput ratio: 24/35][0.07 sec][Hostname/SNI: facebook.com][157.240.224.35][PLAIN TEXT (facebook)][Plen Bins: 50,50,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

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