net/core/skb_fault_injection.c

File Facts

System

Linux kernel

Corpus path

net/core/skb_fault_injection.c

Extension

.c

Size

2366 bytes

Lines

107

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/debugfs.h
• linux/fault-inject.h
• linux/netdevice.h
• linux/skbuff.h

Detected Declarations

• function should_fail_net_realloc_skb
• function skb_might_realloc
• function fail_skb_realloc_setup
• function reset_settings
• function devname_write
• function devname_read
• function fail_skb_realloc_debugfs
• export skb_might_realloc

Annotated Snippet

static const struct file_operations devname_ops = {
	.write = devname_write,
	.read = devname_read,
};

static int __init fail_skb_realloc_debugfs(void)
{
	umode_t mode = S_IFREG | 0600;
	struct dentry *dir;

	dir = fault_create_debugfs_attr("fail_skb_realloc", NULL,
					&skb_realloc.attr);
	if (IS_ERR(dir))
		return PTR_ERR(dir);

	debugfs_create_file("devname", mode, dir, NULL, &devname_ops);

	return 0;
}

late_initcall(fail_skb_realloc_debugfs);

Annotation

• Immediate include surface: `linux/debugfs.h`, `linux/fault-inject.h`, `linux/netdevice.h`, `linux/skbuff.h`.
• Detected declarations: `function should_fail_net_realloc_skb`, `function skb_might_realloc`, `function fail_skb_realloc_setup`, `function reset_settings`, `function devname_write`, `function devname_read`, `function fail_skb_realloc_debugfs`, `export skb_might_realloc`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: pattern implementation candidate.
• 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.