The missing manual BPF CO-RE (Compile Once – Run Everywhere) is a modern approach to writing portable BPF applications that can run on multiple kernel versions and configurations without modifications and runtime source code compilation on the target machine. This is in direct opposition to the more traditional approach provided by BCC framework in which BPF application source code compilation is
A “direct-action” Mode for TC Back to the Basics Hooking eBPF Programs Concept of the “direct-action” The “clsact” Qdisc Example Usage The Code Conclusion References This post was left aside as a draft for a long time. Most of it was written in August 2016, at a time when no documentation for the direct-action mode for TC was available. It is probably less relevant today, but I publish it in case
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