tools/testing/selftests/bpf/progs/bind4_prog.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/bind4_prog.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/bind4_prog.c
Extension
.c
Size
4105 bytes
Lines
168
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 <linux/in.h>
#include <linux/in6.h>
#include <linux/if.h>
#include <errno.h>

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

#include "bind_prog.h"

#define SERV4_IP		0xc0a801feU /* 192.168.1.254 */
#define SERV4_PORT		4040
#define SERV4_REWRITE_IP	0x7f000001U /* 127.0.0.1 */
#define SERV4_REWRITE_PORT	4444

#ifndef IFNAMSIZ
#define IFNAMSIZ 16
#endif

static __inline int bind_to_device(struct bpf_sock_addr *ctx)
{
	char veth1[IFNAMSIZ] = "test_sock_addr1";
	char veth2[IFNAMSIZ] = "test_sock_addr2";
	char missing[IFNAMSIZ] = "nonexistent_dev";
	char del_bind[IFNAMSIZ] = "";
	int veth1_idx, veth2_idx;

	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
			   &veth1, sizeof(veth1)))
		return 1;
	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
			   &veth1_idx, sizeof(veth1_idx)) || !veth1_idx)
		return 1;
	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
			   &veth2, sizeof(veth2)))
		return 1;
	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
			   &veth2_idx, sizeof(veth2_idx)) || !veth2_idx ||
	    veth1_idx == veth2_idx)
		return 1;
	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
			   &missing, sizeof(missing)) != -ENODEV)
		return 1;
	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
			   &veth1_idx, sizeof(veth1_idx)))
		return 1;
	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
			   &del_bind, sizeof(del_bind)))
		return 1;

	return 0;
}

static __inline int bind_reuseport(struct bpf_sock_addr *ctx)
{
	int val = 1;

	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
			   &val, sizeof(val)))
		return 1;
	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
			   &val, sizeof(val)) || !val)
		return 1;
	val = 0;
	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
			   &val, sizeof(val)))
		return 1;
	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_REUSEPORT,
			   &val, sizeof(val)) || val)
		return 1;

	return 0;
}

static __inline int misc_opts(struct bpf_sock_addr *ctx, int opt)
{
	int old, tmp, new = 0xeb9f;

	/* Socket in test case has guarantee that old never equals to new. */
	if (bpf_getsockopt(ctx, SOL_SOCKET, opt, &old, sizeof(old)) ||
	    old == new)
		return 1;
	if (bpf_setsockopt(ctx, SOL_SOCKET, opt, &new, sizeof(new)))
		return 1;

Annotation

Implementation Notes