if ((priority = detect_l3_priority(LOW_PRIORITY, ipv4_hdr)) == OUT_DISCARD)
break;
if ((priority = detect_l4_priority(priority, ipv4_hdr)) == OUT_DISCARD)
if ((priority = detect_l3_priority(LOW_PRIORITY, ipv4_hdr)) == OUT_DISCARD)
break;
if ((priority = detect_l4_priority(priority, ipv4_hdr)) == OUT_DISCARD)