IDS, add advanced feature default-packet-size, closes https://github.com/opnsense/core/issues/1622

(cherry picked from commit 0b89f1d0)

src/opnsense/mvc/app/controllers/OPNsense/IDS/forms/generalSettings.xml

@@ -37,6 +37,13 @@
         <help><![CDATA[Select interface(s) to use. When enabling IPS, only use physical interfaces here (no vlans etc).]]></help>
         <hint>Type or select interface.</hint>
     </field>
+    <field>
+        <id>ids.general.defaultPacketSize</id>
+        <label>default packet size</label>
+        <type>text</type>
+        <advanced>true</advanced>
+        <help><![CDATA[With this option, you can set the size of the packets on your network. It is possible that bigger packets have to be processed sometimes. The engine can still process these bigger packets, but processing it will lower the performance.]]></help>
+    </field>
     <field>
         <id>ids.general.AlertLogrotate</id>
         <label>Rotate log</label>

src/opnsense/mvc/app/models/OPNsense/IDS/IDS.xml

@@ -118,6 +118,12 @@
                     <enable>/^(?!0).*$/</enable>
                 </filters>
             </interfaces>
+            <defaultPacketSize type="IntegerField">
+                <Required>N</Required>
+                <MinimumValue>82</MinimumValue>
+                <MaximumValue>65535</MaximumValue>
+                <ValidationMessage>Enter a valid packet size</ValidationMessage>
+            </defaultPacketSize>
             <UpdateCron type="ModelRelationField">
                 <Model>
                     <queues>

src/opnsense/service/templates/OPNsense/IDS/suricata.yaml

@@ -58,7 +58,9 @@ host-mode: auto
 # Preallocated size for packet. Default is 1514 which is the classical
 # size for pcap on ethernet. You should adjust this value to the highest
 # packet size (MTU + hardware header) on your system.
-#default-packet-size: 1514
+{% if helpers.exists('OPNsense.IDS.general.defaultPacketSize') %}
+default-packet-size: {{OPNsense.IDS.general.defaultPacketSize|default('1514')}}
+{% endif %}
 
 # The default logging directory.  Any log or output file will be
 # placed here if its not specified with a full path name.  This can be