root/usr/share/firewall4/templates/zone-mssfix.uc

   1 {%+ if (rule.family): -%}
   2         meta nfproto {{ fw4.nfproto(rule.family) }} {%+ endif -%}
   3 {%+ include("zone-match.uc", { egress, rule }) -%}
   4 tcp flags syn tcp option maxseg size set rt mtu {%+ if (zone.log & 2): -%}
   5         log prefix "MSSFIX {{ zone.name }} out: " {%+ endif -%}
   6 comment "!fw4: Zone {{ zone.name }} {{
   7         fw4.nfproto(rule.family, true)
   8 }} {{ egress ? "egress" : "ingress" }} MTU fixing"