tools/testing/selftests/bpf/prog_tests/socket_cookie.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/socket_cookie.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/socket_cookie.c
Extension
.c
Size
2217 bytes
Lines
77
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

struct socket_cookie {
	__u64 cookie_key;
	__u32 cookie_value;
};

void test_socket_cookie(void)
{
	int server_fd = 0, client_fd = 0, cgroup_fd = 0, err = 0;
	socklen_t addr_len = sizeof(struct sockaddr_in6);
	struct socket_cookie_prog *skel;
	__u32 cookie_expected_value;
	struct sockaddr_in6 addr;
	struct socket_cookie val;

	skel = socket_cookie_prog__open_and_load();
	if (!ASSERT_OK_PTR(skel, "skel_open"))
		return;

	cgroup_fd = test__join_cgroup("/socket_cookie");
	if (CHECK(cgroup_fd < 0, "join_cgroup", "cgroup creation failed\n"))
		goto out;

	skel->links.set_cookie = bpf_program__attach_cgroup(
		skel->progs.set_cookie, cgroup_fd);
	if (!ASSERT_OK_PTR(skel->links.set_cookie, "prog_attach"))
		goto close_cgroup_fd;

	skel->links.update_cookie_sockops = bpf_program__attach_cgroup(
		skel->progs.update_cookie_sockops, cgroup_fd);
	if (!ASSERT_OK_PTR(skel->links.update_cookie_sockops, "prog_attach"))
		goto close_cgroup_fd;

	skel->links.update_cookie_tracing = bpf_program__attach(
		skel->progs.update_cookie_tracing);
	if (!ASSERT_OK_PTR(skel->links.update_cookie_tracing, "prog_attach"))
		goto close_cgroup_fd;

	server_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
	if (CHECK(server_fd < 0, "start_server", "errno %d\n", errno))
		goto close_cgroup_fd;

	client_fd = connect_to_fd(server_fd, 0);
	if (CHECK(client_fd < 0, "connect_to_fd", "errno %d\n", errno))
		goto close_server_fd;

	err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.socket_cookies),
				  &client_fd, &val);
	if (!ASSERT_OK(err, "map_lookup(socket_cookies)"))
		goto close_client_fd;

	err = getsockname(client_fd, (struct sockaddr *)&addr, &addr_len);
	if (!ASSERT_OK(err, "getsockname"))
		goto close_client_fd;

	cookie_expected_value = (ntohs(addr.sin6_port) << 8) | 0xFF;
	ASSERT_EQ(val.cookie_value, cookie_expected_value, "cookie_value");

close_client_fd:
	close(client_fd);
close_server_fd:
	close(server_fd);
close_cgroup_fd:
	close(cgroup_fd);
out:
	socket_cookie_prog__destroy(skel);
}

Annotation

Implementation Notes