analyzing tcp or udp port info in ip forwarding mode

Set up one network virtual server (0.0.0.0/0) with protocol TCP, binding only to your internal vlan:

virtual tcp_test-std_vip {
   destination any:any
   ip protocol tcp
   vlans internal enable
   rule tcp_forward-rule
}

And another for UDP:

virtual udp_test-std_vip {
   destination any:any
   ip protocol udp
   vlans internal enable
   rule udp_forward-rule
}

Now setup a network forwarding virtual server (0.0.0.0/0) with protocol 1 (ICMP), binding only to your internal vlan:

virtual icmp_test-fwd_vip {
   destination any:any
   ip forward
   ip protocol icmp
   vlans internal enable
}

And of course, the rules for the TCP/UDP forwarding:

rule tcp_forward-rule {
  when CLIENT_ACCEPTED {
    if { [TCP::client_port] > 1024 } {
      forward
    } else { discard }
  }
}
rule udp_forward-rule {
  when CLIENT_ACCEPTED {
    if { [UDP::client_port] > 1024 } {
      forward
    } else { discard }
   }
}

Standard disclaimer...Untested!