net/ipv6/xfrm6_tunnel.c

File Facts

System

Linux kernel

Corpus path

net/ipv6/xfrm6_tunnel.c

Extension

.c

Size

10074 bytes

Lines

404

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/module.h
• linux/xfrm.h
• linux/slab.h
• linux/rculist.h
• net/ip.h
• net/xfrm.h
• net/ipv6.h
• linux/ipv6.h
• linux/icmpv6.h
• linux/mutex.h
• net/netns/generic.h

Detected Declarations

• struct xfrm6_tunnel_net
• struct xfrm6_tunnel_spi
• function xfrm6_tunnel_spi_hash_byaddr
• function xfrm6_tunnel_spi_hash_byspi
• function hlist_for_each_entry_rcu
• function xfrm6_tunnel_spi_lookup
• function __xfrm6_tunnel_spi_check
• function hlist_for_each_entry
• function __xfrm6_tunnel_alloc_spi
• function xfrm6_tunnel_alloc_spi
• function x6spi_destroy_rcu
• function xfrm6_tunnel_free_spi
• function hlist_for_each_entry_safe
• function xfrm6_tunnel_output
• function xfrm6_tunnel_input
• function xfrm6_tunnel_rcv
• function xfrm6_tunnel_err
• function xfrm6_tunnel_init_state
• function xfrm6_tunnel_destroy
• function xfrm6_tunnel_net_init
• function xfrm6_tunnel_net_exit
• function xfrm6_tunnel_init
• function xfrm6_tunnel_fini
• module init xfrm6_tunnel_init
• export xfrm6_tunnel_spi_lookup
• export xfrm6_tunnel_alloc_spi

Annotated Snippet

module_init(xfrm6_tunnel_init);
module_exit(xfrm6_tunnel_fini);
MODULE_DESCRIPTION("IPv6 XFRM tunnel driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);

Annotation

• Immediate include surface: `linux/module.h`, `linux/xfrm.h`, `linux/slab.h`, `linux/rculist.h`, `net/ip.h`, `net/xfrm.h`, `net/ipv6.h`, `linux/ipv6.h`.
• Detected declarations: `struct xfrm6_tunnel_net`, `struct xfrm6_tunnel_spi`, `function xfrm6_tunnel_spi_hash_byaddr`, `function xfrm6_tunnel_spi_hash_byspi`, `function hlist_for_each_entry_rcu`, `function xfrm6_tunnel_spi_lookup`, `function __xfrm6_tunnel_spi_check`, `function hlist_for_each_entry`, `function __xfrm6_tunnel_alloc_spi`, `function xfrm6_tunnel_alloc_spi`.
• 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.