linux/Documentation/networking/filter.rst
eBPF specification (somewhat outdated; information should still be valid, but not exhaustive).
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- 2026-10-10
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similar
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linux/include/linux/filter.h git.kernel.org
with linux/include/uapi/filter.h: information used to run the BPF programs themselves.
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linux/net/core/filter.c git.kernel.org
Functions and eBPF helpers related to networking (TC, XDP etc.); also contains the code to migrate cBPF bytecode to eBPF (all cBPF programs are translated to eBPF in recent kernels).
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linux/net/sched/ git.kernel.org
and in particular in files act_bpf.c (action) and cls_bpf.c (filter): code related to BPF actions and filters with TC.
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eBPF › Reference Documentation > Kernel Documentation: “eBPF specification (somewhat outdated; information should still be valid, but not exhaustive).”