net/netfilter/nft_ct.c

File Facts

System

Linux kernel

Corpus path

net/netfilter/nft_ct.c

Extension

.c

Size

34324 bytes

Lines

1427

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.
• 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/kernel.h
• linux/init.h
• linux/module.h
• linux/netlink.h
• linux/netfilter.h
• linux/netfilter/nf_tables.h
• net/netfilter/nf_tables_core.h
• net/netfilter/nf_conntrack.h
• net/netfilter/nf_conntrack_acct.h
• net/netfilter/nf_conntrack_tuple.h
• net/netfilter/nf_conntrack_helper.h
• net/netfilter/nf_conntrack_ecache.h
• net/netfilter/nf_conntrack_labels.h
• net/netfilter/nf_conntrack_timeout.h
• net/netfilter/nf_conntrack_l4proto.h
• net/netfilter/nf_conntrack_expect.h
• net/netfilter/nf_conntrack_seqadj.h
• nf_internals.h

Detected Declarations

• struct nft_ct_helper_obj
• struct nft_ct_timeout_obj
• struct nft_ct_expect_obj
• function nft_ct_get_eval_counter
• function nft_ct_get_eval
• function nft_ct_set_zone_eval
• function nft_ct_set_eval
• function nft_ct_tmpl_put_pcpu
• function for_each_possible_cpu
• function nft_ct_tmpl_alloc_pcpu
• function for_each_possible_cpu
• function __nft_ct_get_destroy
• function nft_ct_get_init
• function __nft_ct_set_destroy
• function nft_ct_set_init
• function nft_ct_get_destroy
• function nft_ct_set_destroy
• function nft_ct_get_dump
• function nft_ct_set_dump
• function nft_ct_select_ops
• function nft_notrack_eval
• function nft_ct_timeout_parse_policy
• function nft_ct_timeout_obj_eval
• function nft_ct_timeout_obj_init
• function nft_ct_timeout_obj_destroy
• function nft_ct_timeout_obj_dump
• function nft_ct_helper_obj_init
• function nft_ct_helper_obj_destroy
• function nft_ct_helper_obj_eval
• function nft_ct_helper_obj_dump
• function nft_ct_expect_obj_init
• function nft_ct_expect_obj_destroy
• function nft_ct_expect_obj_dump
• function nft_ct_expect_obj_eval
• function nft_ct_module_init
• function nft_ct_module_exit
• module init nft_ct_module_init

Annotated Snippet

module_init(nft_ct_module_init);
module_exit(nft_ct_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("ct");
MODULE_ALIAS_NFT_EXPR("notrack");
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER);
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT);
MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_EXPECT);
MODULE_DESCRIPTION("Netfilter nf_tables conntrack module");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/init.h`, `linux/module.h`, `linux/netlink.h`, `linux/netfilter.h`, `linux/netfilter/nf_tables.h`, `net/netfilter/nf_tables_core.h`, `net/netfilter/nf_conntrack.h`.
• Detected declarations: `struct nft_ct_helper_obj`, `struct nft_ct_timeout_obj`, `struct nft_ct_expect_obj`, `function nft_ct_get_eval_counter`, `function nft_ct_get_eval`, `function nft_ct_set_zone_eval`, `function nft_ct_set_eval`, `function nft_ct_tmpl_put_pcpu`, `function for_each_possible_cpu`, `function nft_ct_tmpl_alloc_pcpu`.
• 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.

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.