PACKET_SOCK_AUXDATA
if (packet_sock_flag(pkt_sk(sk), PACKET_SOCK_AUXDATA)) {
packet_sock_flag_set(po, PACKET_SOCK_AUXDATA, val);
val = packet_sock_flag(po, PACKET_SOCK_AUXDATA);
if (packet_sock_flag(po, PACKET_SOCK_AUXDATA))