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BPF Documentation

This directory contains documentation for the BPF (Berkeley Packet Filter) facility, with a focus on the extended BPF version (eBPF).

This kernel side documentation is still work in progress. The main textual documentation is (for historical reasons) described in Documentation/networking/filter.txt, which describe both classical and extended BPF instruction-set. The Cilium project also maintains a BPF and XDP Reference Guide that goes into great technical depth about the BPF Architecture.

The primary info for the bpf syscall is available in the man-pages for bpf(2).

BPF Type Format (BTF)

.. toctree::
   :maxdepth: 1

   btf


Frequently asked questions (FAQ)

Two sets of Questions and Answers (Q&A) are maintained.

.. toctree::
   :maxdepth: 1

   bpf_design_QA
   bpf_devel_QA


Program types

.. toctree::
   :maxdepth: 1

   prog_cgroup_sockopt
   prog_cgroup_sysctl
   prog_flow_dissector