net/netfilter/xt_IDLETIMER.c

File Facts

System

Linux kernel

Corpus path

net/netfilter/xt_IDLETIMER.c

Extension

.c

Size

14533 bytes

Lines

584

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/timer.h
• linux/alarmtimer.h
• linux/list.h
• linux/mutex.h
• linux/netfilter.h
• linux/netfilter/x_tables.h
• linux/netfilter/xt_IDLETIMER.h
• linux/kdev_t.h
• linux/kobject.h
• linux/workqueue.h
• linux/sysfs.h

Detected Declarations

• struct idletimer_tg
• function list_for_each_entry
• function idletimer_tg_show
• function idletimer_tg_work
• function idletimer_tg_expired
• function idletimer_tg_alarmproc
• function idletimer_start_alarm_ktime
• function idletimer_start_alarm_sec
• function idletimer_check_sysfs_name
• function idletimer_tg_create
• function idletimer_tg_create_v1
• function idletimer_tg_target
• function idletimer_tg_target_v1
• function idletimer_tg_helper
• function strnlen
• function idletimer_tg_checkentry
• function idletimer_tg_checkentry_v1
• function idletimer_tg_destroy
• function idletimer_tg_destroy_v1
• function idletimer_tg_init
• function idletimer_tg_exit
• module init idletimer_tg_init

Annotated Snippet

module_init(idletimer_tg_init);
module_exit(idletimer_tg_exit);

MODULE_AUTHOR("Timo Teras <ext-timo.teras@nokia.com>");
MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
MODULE_DESCRIPTION("Xtables: idle time monitor");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("ipt_IDLETIMER");
MODULE_ALIAS("ip6t_IDLETIMER");

Annotation

• Immediate include surface: `linux/module.h`, `linux/timer.h`, `linux/alarmtimer.h`, `linux/list.h`, `linux/mutex.h`, `linux/netfilter.h`, `linux/netfilter/x_tables.h`, `linux/netfilter/xt_IDLETIMER.h`.
• Detected declarations: `struct idletimer_tg`, `function list_for_each_entry`, `function idletimer_tg_show`, `function idletimer_tg_work`, `function idletimer_tg_expired`, `function idletimer_tg_alarmproc`, `function idletimer_start_alarm_ktime`, `function idletimer_start_alarm_sec`, `function idletimer_check_sysfs_name`, `function idletimer_tg_create`.
• 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.