include/uapi/linux/netfilter/xt_policy.h

File Facts

System

Linux kernel

Corpus path

include/uapi/linux/netfilter/xt_policy.h

Extension

.h

Size

1240 bytes

Lines

74

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/netfilter.h
• linux/types.h
• linux/in.h
• linux/in6.h

Detected Declarations

• struct xt_policy_spec
• struct xt_policy_elem
• struct xt_policy_info
• enum xt_policy_flags
• enum xt_policy_modes

Annotated Snippet

struct xt_policy_spec {
	__u8	saddr:1,
			daddr:1,
			proto:1,
			mode:1,
			spi:1,
			reqid:1;
};

#ifndef __KERNEL__
union xt_policy_addr {
	struct in_addr	a4;
	struct in6_addr	a6;
};
#endif

struct xt_policy_elem {
	union {
#ifdef __KERNEL__
		struct {
			union nf_inet_addr saddr;
			union nf_inet_addr smask;
			union nf_inet_addr daddr;
			union nf_inet_addr dmask;
		};
#else
		struct {
			union xt_policy_addr saddr;
			union xt_policy_addr smask;
			union xt_policy_addr daddr;
			union xt_policy_addr dmask;
		};
#endif
	};
	__be32			spi;
	__u32		reqid;
	__u8		proto;
	__u8		mode;

	struct xt_policy_spec	match;
	struct xt_policy_spec	invert;
};

struct xt_policy_info {
	struct xt_policy_elem pol[XT_POLICY_MAX_ELEM];
	__u16 flags;
	__u16 len;
};

#endif /* _XT_POLICY_H */

Annotation

• Immediate include surface: `linux/netfilter.h`, `linux/types.h`, `linux/in.h`, `linux/in6.h`.
• Detected declarations: `struct xt_policy_spec`, `struct xt_policy_elem`, `struct xt_policy_info`, `enum xt_policy_flags`, `enum xt_policy_modes`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source 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.