Documentation/admin-guide/sysctl/net.rst

Source file repositories/reference/linux-study-clean/Documentation/admin-guide/sysctl/net.rst

File Facts

System: Linux kernel
Corpus path: Documentation/admin-guide/sysctl/net.rst
Extension: .rst
Size: 19957 bytes
Lines: 588
Domain: Support Tooling And Documentation
Bucket: Documentation
Inferred role: Support Tooling And Documentation: documentation
Status: atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

================================
Documentation for /proc/sys/net/
================================

Copyright

Copyright (c) 1999

	- Terrehon Bowden <terrehon@pacbell.net>
	- Bodo Bauer <bb@ricochet.net>

Copyright (c) 2000

	- Jorge Nerin <comandante@zaralinux.com>

Copyright (c) 2009

	- Shen Feng <shen@cn.fujitsu.com>

For general info and legal blurb, please look in index.rst.

------------------------------------------------------------------------------

This file contains the documentation for the sysctl files in
/proc/sys/net

The interface  to  the  networking  parts  of  the  kernel  is  located  in
/proc/sys/net. The following table shows all possible subdirectories.  You may
see only some of them, depending on your kernel's configuration.


Table : Subdirectories in /proc/sys/net

 ========= =================== = ========== ===================
 Directory Content               Directory  Content
 ========= =================== = ========== ===================
 802       E802 protocol         mptcp      Multipath TCP
 appletalk Appletalk protocol    netfilter  Network Filter
 bridge    Bridging              tipc       TIPC
 core      General parameter     unix       Unix domain sockets
 ethernet  Ethernet protocol     vsock      VSOCK sockets
 ipv4      IP version 4          x25        X.25 protocol
 ipv6      IP version 6
 ========= =================== = ========== ===================

1. /proc/sys/net/core - Network core options
============================================

bpf_jit_enable
--------------

This enables the BPF Just in Time (JIT) compiler. BPF is a flexible
and efficient infrastructure allowing to execute bytecode at various
hook points. It is used in a number of Linux kernel subsystems such
as networking (e.g. XDP, tc), tracing (e.g. kprobes, uprobes, tracepoints)
and security (e.g. seccomp). LLVM has a BPF back end that can compile
restricted C into a sequence of BPF instructions. After program load
through bpf(2) and passing a verifier in the kernel, a JIT will then
translate these BPF proglets into native CPU instructions. There are
two flavors of JITs, the newer eBPF JIT currently supported on:

  - x86_64
  - x86_32
  - arm64
  - arm32
  - ppc64
  - ppc32
  - sparc64
  - mips64
  - s390x

Annotation

Atlas domain: Support Tooling And Documentation / Documentation.
Implementation status: atlas-only.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.