(proxy) add configurable cache_mem, closes https://github.com/opnsense/core/issues/417

src/opnsense/mvc/app/controllers/OPNsense/Proxy/forms/main.xml

@@ -92,6 +92,13 @@
             </field>
         </subtab>
         <subtab id="proxy-general-cache-local" description="Local Cache Settings">
+            <field>
+                <id>proxy.general.cache.local.cache_mem</id>
+                <label>Memory Cache size in Megabytes</label>
+                <type>text</type>
+                <help><![CDATA[Enter the cache memory size to use.]]></help>
+                <advanced>true</advanced>
+            </field>
             <field>
                 <id>proxy.general.cache.local.enabled</id>
                 <label>Enable local cache (requires service restart)</label>

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

@@ -78,6 +78,12 @@
                         <default>/var/squid/cache</default>
                         <Required>Y</Required>
                     </directory>
+                    <cache_mem type="IntegerField">
+                        <default>256</default>
+                        <MinimumValue>1</MinimumValue>
+                        <ValidationMessage>Specify a positive memory cache size. (number of MB's)</ValidationMessage>
+                        <Required>Y</Required>
+                    </cache_mem>
                     <size type="IntegerField">
                         <default>100</default>
                         <MinimumValue>1</MinimumValue>

src/opnsense/service/templates/OPNsense/Proxy/squid.conf

@@ -276,6 +276,8 @@ cache_dir ufs {{OPNsense.proxy.general.cache.local.directory}} {{OPNsense.proxy.
 {%  endif %}
 {% endif %}
 
+cache_mem {{ OPNsense.proxy.general.cache.local.cache_mem|default('256') }} MB
+
 # Leave coredumps in the first cache dir
 coredump_dir /var/squid/cache