net/8021q/vlan.c

File Facts

System

Linux kernel

Corpus path

net/8021q/vlan.c

Extension

.c

Size

18464 bytes

Lines

771

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.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• 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/capability.h
• linux/module.h
• linux/netdevice.h
• linux/skbuff.h
• linux/slab.h
• linux/init.h
• linux/rculist.h
• net/arp.h
• linux/rtnetlink.h
• linux/notifier.h
• net/rtnetlink.h
• net/net_namespace.h
• net/netns/generic.h
• linux/uaccess.h
• linux/if_vlan.h
• vlan.h
• vlanproc.h

Detected Declarations

• function vlan_group_prealloc_vid
• function vlan_stacked_transfer_operstate
• function unregister_vlan_dev
• function vlan_check_real_dev
• function register_vlan_dev
• function register_vlan_device
• function vlan_sync_address
• function vlan_transfer_features
• function __vlan_device_event
• function vlan_vid0_add
• function vlan_vid0_del
• function vlan_device_event
• function vlan_group_for_each_dev
• function vlan_group_for_each_dev
• function vlan_group_for_each_dev
• function list_for_each_entry_safe
• function vlan_group_for_each_dev
• function vlan_group_for_each_dev
• function vlan_ioctl_handler
• function vlan_init_net
• function vlan_exit_net
• function vlan_proto_init
• function vlan_cleanup_module
• module init vlan_proto_init

Annotated Snippet

module_init(vlan_proto_init);
module_exit(vlan_cleanup_module);

MODULE_DESCRIPTION("802.1Q/802.1ad VLAN Protocol");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_IMPORT_NS("NETDEV_INTERNAL");

Annotation

• Immediate include surface: `linux/capability.h`, `linux/module.h`, `linux/netdevice.h`, `linux/skbuff.h`, `linux/slab.h`, `linux/init.h`, `linux/rculist.h`, `net/arp.h`.
• Detected declarations: `function vlan_group_prealloc_vid`, `function vlan_stacked_transfer_operstate`, `function unregister_vlan_dev`, `function vlan_check_real_dev`, `function register_vlan_dev`, `function register_vlan_device`, `function vlan_sync_address`, `function vlan_transfer_features`, `function __vlan_device_event`, `function vlan_vid0_add`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• 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.