recipes-google/debug/strowger/90-gbmc-strowgerd.rules

table inet filter {
    chain gbmc_br_pub_input {
        tcp dport 5124 accept
    }
    chain count_port_5124 {
        counter comment "tcp-server-5124-synack"
    }
}

add element inet filter port_to_chain_map { 5124 : jump count_port_5124 }