net/ipv6/fou6.c

File Facts

System

Linux kernel

Corpus path

net/ipv6/fou6.c

Extension

.c

Size

5141 bytes

Lines

227

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

Dependency Surface

• linux/module.h
• linux/errno.h
• linux/socket.h
• linux/skbuff.h
• linux/ip.h
• linux/udp.h
• linux/icmpv6.h
• linux/types.h
• linux/kernel.h
• net/fou.h
• net/ip.h
• net/ip6_tunnel.h
• net/ip6_checksum.h
• net/protocol.h
• net/udp.h
• net/udp_tunnel.h

Detected Declarations

• function fou6_build_udp
• function fou6_build_header
• function gue6_build_header
• function gue6_err_proto_handler
• function gue6_err
• function ip6_tnl_encap_add_fou_ops
• function ip6_tnl_encap_del_fou_ops
• function ip6_tnl_encap_add_fou_ops
• function ip6_tnl_encap_del_fou_ops
• function fou6_fini
• module init fou6_init

Annotated Snippet

module_init(fou6_init);
module_exit(fou6_fini);
MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Foo over UDP (IPv6)");

Annotation

• Immediate include surface: `linux/module.h`, `linux/errno.h`, `linux/socket.h`, `linux/skbuff.h`, `linux/ip.h`, `linux/udp.h`, `linux/icmpv6.h`, `linux/types.h`.
• Detected declarations: `function fou6_build_udp`, `function fou6_build_header`, `function gue6_build_header`, `function gue6_err_proto_handler`, `function gue6_err`, `function ip6_tnl_encap_add_fou_ops`, `function ip6_tnl_encap_del_fou_ops`, `function ip6_tnl_encap_add_fou_ops`, `function ip6_tnl_encap_del_fou_ops`, `function fou6_fini`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration implementation candidate.

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.