DoS/DDoS filtering logic improvements and optimizations

In the battle against distributed denial-of-service (DDoS) attacks, the company has long sought ways to improve the effectiveness of filtering tools while minimizing the potential for traffic leaks. Recently, there have been major strides in optimizing multi sequence filters to minimize traffic leaks during the second stage of filtering.

The implementation of XDP filtering in driver mode is one significant enhancement. Compared to skb, which was slower owing to its testing restrictions, this method is the quickest and most effective approach to load filtering code straight into the network interface board (NIC). We may filter up to 10 million packets per second per core using XDP filtering in driver mode, giving it a potent defense against DDoS assaults.

Avoiding loops, which can significantly increase network latency and packet loss when improperly used, is another important aspect of optimizing multi sequence filters. Instead, the code for the filter should be simplified to remove any extra loops that might make it take longer to filter data.

To further enhance the capabilities of multi sequence filters, a deep packet inspection (DPI) algorithm has been deployed in the code. This algorithm is designed to identify and respond to dynamic payload matching with reliable performance. By combining this algorithm with the power of XDP filtering in driver mode, we can greatly improve their ability to identify and block malicious traffic, thereby reducing the risk of a successful DDoS attack.

Overall, the improved optimization of multi sequence filters is a significant step forward in the fight against DDoS attacks. By deploying XDP filtering in driver mode, streamlining code to avoid loops, and incorporating DPI algorithms, we can greatly enhance their ability to identify and respond to malicious traffic, reducing the risk of a successful DDoS attack. It's important to note that while these advancements are highly effective, they should always be used in conjunction with other security measures, including firewalls and intrusion prevention systems, to provide comprehensive protection against all types of cyber threats, in our case we use Suricata as a IDS,IPS (Intrusion Detection System, Intrusion Prevention System).

For this task I can't include any code previews as this code is highly confidential but I can on demand show proofs on how it was done.