net/sched/act_ct.c

File Facts

System

Linux kernel

Corpus path

net/sched/act_ct.c

Extension

.c

Size

42338 bytes

Lines

1711

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/module.h
• linux/init.h
• linux/kernel.h
• linux/skbuff.h
• linux/rtnetlink.h
• linux/pkt_cls.h
• linux/if_tunnel.h
• linux/ip.h
• linux/ipv6.h
• linux/rhashtable.h
• net/gre.h
• net/netlink.h
• net/pkt_sched.h
• net/pkt_cls.h
• net/act_api.h
• net/ip.h
• net/ipv6_frag.h
• uapi/linux/tc_act/tc_ct.h
• net/tc_act/tc_ct.h
• net/tc_wrapper.h
• net/netfilter/nf_flow_table.h
• net/netfilter/nf_conntrack.h
• net/netfilter/nf_conntrack_core.h
• net/netfilter/nf_conntrack_zones.h
• net/netfilter/nf_conntrack_helper.h
• net/netfilter/nf_conntrack_acct.h
• net/netfilter/ipv6/nf_defrag_ipv6.h
• net/netfilter/nf_conntrack_act_ct.h
• net/netfilter/nf_conntrack_seqadj.h
• uapi/linux/netfilter/nf_nat.h

Detected Declarations

• struct zones_ht_key
• struct tcf_ct_flow_table
• struct tc_ct_action_net
• function tcf_ct_flow_table_flow_action_get_next
• function tcf_ct_add_mangle_action
• function tcf_ct_flow_table_add_action_nat_ipv4
• function tcf_ct_add_ipv6_addr_mangle_action
• function tcf_ct_flow_table_add_action_nat_ipv6
• function tcf_ct_flow_table_add_action_nat_tcp
• function tcf_ct_flow_table_add_action_nat_udp
• function tcf_ct_flow_table_add_action_meta
• function tcf_ct_flow_table_add_action_nat
• function tcf_ct_flow_table_fill_actions
• function tcf_ct_flow_is_outdated
• function tcf_ct_nf_get
• function tcf_ct_nf_put
• function tcf_ct_flow_table_get
• function tcf_ct_flow_table_get_ref
• function tcf_ct_flow_table_cleanup_work
• function tcf_ct_flow_table_put
• function tcf_ct_flow_tc_ifidx
• function tcf_ct_flow_ct_ext_ifidx_update
• function tcf_ct_flow_table_add
• function tcf_ct_flow_table_process_conn
• function tcf_ct_flow_table_fill_tuple_ipv4
• function tcf_ct_flow_table_fill_tuple_ipv6
• function tcf_ct_flow_table_lookup
• function tcf_ct_flow_tables_init
• function tcf_ct_flow_tables_uninit
• function tcf_ct_skb_nfct_cached
• function CTINFO2DIR
• function tcf_ct_skb_nf_family
• function tcf_ct_ipv4_is_fragment
• function tcf_ct_ipv6_is_fragment
• function tcf_ct_handle_fragments
• function tcf_ct_params_free
• function tcf_ct_params_free_rcu
• function tcf_ct_act_set_mark
• function tcf_ct_act_set_labels
• function tcf_ct_act_nat
• function tcf_ct_act
• function tcf_ct_fill_params_nat
• function tcf_ct_set_key_val
• function tcf_ct_fill_params
• function tcf_ct_init
• function tcf_ct_cleanup
• function tcf_ct_dump_key_val
• function tcf_ct_dump_nat

Annotated Snippet

module_init(ct_init_module);
module_exit(ct_cleanup_module);
MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
MODULE_DESCRIPTION("Connection tracking action");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/module.h`, `linux/init.h`, `linux/kernel.h`, `linux/skbuff.h`, `linux/rtnetlink.h`, `linux/pkt_cls.h`, `linux/if_tunnel.h`, `linux/ip.h`.
• Detected declarations: `struct zones_ht_key`, `struct tcf_ct_flow_table`, `struct tc_ct_action_net`, `function tcf_ct_flow_table_flow_action_get_next`, `function tcf_ct_add_mangle_action`, `function tcf_ct_flow_table_add_action_nat_ipv4`, `function tcf_ct_add_ipv6_addr_mangle_action`, `function tcf_ct_flow_table_add_action_nat_ipv6`, `function tcf_ct_flow_table_add_action_nat_tcp`, `function tcf_ct_flow_table_add_action_nat_udp`.
• 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.