ipfw_add_eaction
uint32_t ipfw_add_eaction(struct ip_fw_chain *ch, ipfw_eaction_t handler,
V_nat64clat_eid = ipfw_add_eaction(ch, ipfw_nat64clat, "nat64clat");
V_nat64lsn_eid = ipfw_add_eaction(ch, ipfw_nat64lsn, "nat64lsn");
V_nat64stl_eid = ipfw_add_eaction(ch, ipfw_nat64stl, "nat64stl");
V_nptv6_eid = ipfw_add_eaction(ch, ipfw_nptv6, "nptv6");
V_tcpmod_setmss_eid = ipfw_add_eaction(ch, ipfw_tcpmod, "tcp-setmss");