test: add test for vlan.id - v5

tests/detect-vlan-id/README.md

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+Test for checking the working of vlan.id keyword by creating rules and matching a crafted packet against them. The packet is an ICMP packet with 3 different VLAN ids [200,300,400].
+
+PCAP created with scapy 2.5.0.

tests/detect-vlan-id/test.rules

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+alert ip any any -> any any (msg:"Vlan ID is equal to 200 with specific layer"; vlan.id:200,0; sid:1;)
+alert ip any any -> any any (msg:"One Vlan ID is equal to 300"; vlan.id:300; sid:2;)
+alert ip any any -> any any (msg:"Last Vlan ID is equal to 400"; vlan.id:400,-1; sid:3;)
+alert ip any any -> any any (msg:"Vlan ID is equal to 300 with specific layer"; vlan.id:0x12C,1; sid:4;)
+alert ip any any -> any any (msg:"Vlan ID at layer 1 is not equal to 200"; vlan.id:!200,1; sid:5;)
+alert ip any any -> any any (msg:"There is no VLAN ID equal to 500"; vlan.id:!500; sid:6;)
+alert ip any any -> any any (msg:"VLAN ID at layer 2 is between 100 and 600"; vlan.id:100-600; sid:7;)
+alert ip any any -> any any (msg:"VLAN ID at layer 1 is less than 400"; vlan.id:<400; sid:8;)
+alert ip any any -> any any (msg:"One Vlan ID is greater than or equal to 200"; vlan.id:>=0xC8; sid:9;)

tests/detect-vlan-id/test.yaml

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+requires:
+ min-version: 8
+
+args:
+- -k none
+
+checks:
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     vlan[0]: 200
+     alert.signature_id: 1
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     vlan[1]: 300
+     alert.signature_id: 2
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     vlan[2]: 400
+     alert.signature_id: 3
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     vlan[1]: 300
+     alert.signature_id: 4
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     alert.signature_id: 5
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     alert.signature_id: 6
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     alert.signature_id: 7
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     alert.signature_id: 8
+- filter:
+   count: 1
+   match:
+     event_type: alert
+     alert.signature_id: 9

tests/detect-vlan-id/writepcap.py

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+#! /usr/bin/env python3
+from scapy.all import *
+
+CLIENT_MAC = "11:11:11:11:11:11"
+SERVER_MAC = "22:22:22:22:22:22"
+
+CLIENT_IP = "1.1.1.1"
+SERVER_IP = "2.2.2.2"
+
+request = (Ether(src=CLIENT_MAC, dst=SERVER_MAC) /
+               Dot1Q(vlan=200) /
+               Dot1Q(vlan=300) /
+               Dot1Q(vlan=400) /
+               IP(src=CLIENT_IP, dst=SERVER_IP) /
+               ICMP(type=8))
+
+wrpcap("input.pcap", request, append=False)