net/netfilter/nfnetlink_hook.c

File Facts

System

Linux kernel

Corpus path

net/netfilter/nfnetlink_hook.c

Extension

.c

Size

11310 bytes

Lines

487

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

• Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/bpf.h
• linux/module.h
• linux/kallsyms.h
• linux/kernel.h
• linux/types.h
• linux/skbuff.h
• linux/errno.h
• linux/netlink.h
• linux/slab.h
• linux/netfilter.h
• linux/netfilter/nfnetlink.h
• linux/netfilter/nfnetlink_hook.h
• net/netfilter/nf_tables.h
• net/sock.h

Detected Declarations

• struct nfnl_dump_hook_data
• function nf_netlink_dump_start_rcu
• function nfnl_hook_put_bpf_prog_info
• function nfnl_hook_put_nft_info_desc
• function nla_put_string
• function nfnl_hook_put_nft_chain_info
• function nfnl_hook_put_nft_ft_info
• function nfnl_hook_dump_one
• function nfnl_hook_entries_head
• function nfnl_hook_dump
• function nfnl_hook_dump_start
• function nfnl_hook_dump_stop
• function nfnl_hook_get
• function nfnetlink_hook_init
• function nfnetlink_hook_exit
• module init nfnetlink_hook_init

Annotated Snippet

module_init(nfnetlink_hook_init);
module_exit(nfnetlink_hook_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
MODULE_DESCRIPTION("nfnetlink_hook: list registered netfilter hooks");

Annotation

• Immediate include surface: `linux/bpf.h`, `linux/module.h`, `linux/kallsyms.h`, `linux/kernel.h`, `linux/types.h`, `linux/skbuff.h`, `linux/errno.h`, `linux/netlink.h`.
• Detected declarations: `struct nfnl_dump_hook_data`, `function nf_netlink_dump_start_rcu`, `function nfnl_hook_put_bpf_prog_info`, `function nfnl_hook_put_nft_info_desc`, `function nla_put_string`, `function nfnl_hook_put_nft_chain_info`, `function nfnl_hook_put_nft_ft_info`, `function nfnl_hook_dump_one`, `function nfnl_hook_entries_head`, `function nfnl_hook_dump`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.