tools/testing/selftests/bpf/progs/recvmsg4_prog.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/recvmsg4_prog.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/recvmsg4_prog.c
Extension
.c
Size
723 bytes
Lines
41
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 <linux/stddef.h>
#include <linux/bpf.h>
#include <linux/in.h>
#include <sys/socket.h>

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

#include <bpf_sockopt_helpers.h>

#define SERV4_IP		0xc0a801feU /* 192.168.1.254 */
#define SERV4_PORT		4040

SEC("cgroup/recvmsg4")
int recvmsg4_prog(struct bpf_sock_addr *ctx)
{
	struct bpf_sock *sk;

	sk = ctx->sk;
	if (!sk)
		return 1;

	if (sk->family != AF_INET)
		return 1;

	if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
		return 1;

	if (!get_set_sk_priority(ctx))
		return 1;

	ctx->user_ip4 = bpf_htonl(SERV4_IP);
	ctx->user_port = bpf_htons(SERV4_PORT);

	return 1;
}

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

Annotation

Implementation Notes