int catchup_server_socket
mc_multicast_socket_t multicast_sockets[MC_N_TRANSPORT_TYPE]
mc_socket_catchup_t * catchups
u32 base_multicast_udp_port_host_byte_order
uword * catchup_index_by_file_descriptor
u32 if_ip4_address_net_byte_order
u32 multicast_tx_ip4_address_host_byte_order
char * multicast_interface_name