tools/testing/selftests/bpf/progs/connect4_dropper.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/connect4_dropper.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/connect4_dropper.c
Extension
.c
Size
519 bytes
Lines
29
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#include <string.h>

#include <linux/stddef.h>
#include <linux/bpf.h>

#include <sys/socket.h>

#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>

#define VERDICT_REJECT	0
#define VERDICT_PROCEED	1

int port;

SEC("cgroup/connect4")
int connect_v4_dropper(struct bpf_sock_addr *ctx)
{
	if (ctx->type != SOCK_STREAM)
		return VERDICT_PROCEED;
	if (ctx->user_port == bpf_htons(port))
		return VERDICT_REJECT;
	return VERDICT_PROCEED;
}

char _license[] SEC("license") = "GPL";

Annotation

Implementation Notes