PACKET_SOCK_TP_LOSS
if (packet_sock_flag(po, PACKET_SOCK_TP_LOSS)) {
packet_sock_flag_set(po, PACKET_SOCK_TP_LOSS, val);
val = packet_sock_flag(po, PACKET_SOCK_TP_LOSS);
if (packet_sock_flag(po, PACKET_SOCK_TP_LOSS))