Using eBPF to attribute packet drops to netfilter rules

This blog post explores the use of eBPF (Extended Berkeley Packet Filter) to analyze and attribute packet drops within the netfilter ruleset of the Linux kernel. It provides a detailed technical explanation of setting up eBPF probes to trace kernel functions, particularly focusing on how to determine which netfilter rule is responsible for dropping packets. The article includes code snippets and a practical example, demonstrating the power and flexibility of eBPF for troubleshooting networking issues within the Linux environment.