net/ipv4/tunnel4.c
Source file repositories/reference/linux-study-clean/net/ipv4/tunnel4.c
File Facts
- System
- Linux kernel
- Corpus path
net/ipv4/tunnel4.c- Extension
.c- Size
- 6705 bytes
- Lines
- 299
- 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/init.hlinux/module.hlinux/mutex.hlinux/mpls.hlinux/netdevice.hlinux/skbuff.hlinux/slab.hnet/icmp.hnet/ip.hnet/protocol.hnet/xfrm.h
Detected Declarations
function xfrm4_tunnel_registerfunction xfrm4_tunnel_deregisterfunction tunnel4_rcvfunction tunnel4_rcv_cbfunction for_each_tunnel_rcufunction tunnel64_rcvfunction tunnelmpls4_rcvfunction tunnel4_errfunction tunnel64_errfunction tunnelmpls4_errfunction tunnel4_initfunction tunnel4_finimodule init tunnel4_initexport xfrm4_tunnel_registerexport xfrm4_tunnel_deregister
Annotated Snippet
module_init(tunnel4_init);
module_exit(tunnel4_fini);
MODULE_DESCRIPTION("IPv4 XFRM tunnel library");
MODULE_LICENSE("GPL");Annotation
- Immediate include surface: `linux/init.h`, `linux/module.h`, `linux/mutex.h`, `linux/mpls.h`, `linux/netdevice.h`, `linux/skbuff.h`, `linux/slab.h`, `net/icmp.h`.
- Detected declarations: `function xfrm4_tunnel_register`, `function xfrm4_tunnel_deregister`, `function tunnel4_rcv`, `function tunnel4_rcv_cb`, `function for_each_tunnel_rcu`, `function tunnel64_rcv`, `function tunnelmpls4_rcv`, `function tunnel4_err`, `function tunnel64_err`, `function tunnelmpls4_err`.
- 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.