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

// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>

/* TODO: corrupts other tests uses connect() */
void serial_test_probe_user(void)
{
	static const char *const prog_names[] = {
		"handle_sys_connect",
#if defined(__s390x__)
		"handle_sys_socketcall",
#endif
	};
	enum { prog_count = ARRAY_SIZE(prog_names) };
	const char *obj_file = "./test_probe_user.o";
	DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, );
	int err, results_map_fd, sock_fd, duration = 0;
	struct sockaddr curr, orig, tmp;
	struct sockaddr_in *in = (struct sockaddr_in *)&curr;
	struct bpf_link *kprobe_links[prog_count] = {};
	struct bpf_program *kprobe_progs[prog_count];
	struct bpf_object *obj;
	static const int zero = 0;
	size_t i;

	obj = bpf_object__open_file(obj_file, &opts);
	if (!ASSERT_OK_PTR(obj, "obj_open_file"))
		return;

	for (i = 0; i < prog_count; i++) {
		kprobe_progs[i] =
			bpf_object__find_program_by_name(obj, prog_names[i]);
		if (CHECK(!kprobe_progs[i], "find_probe",
			  "prog '%s' not found\n", prog_names[i]))
			goto cleanup;
	}

	err = bpf_object__load(obj);
	if (CHECK(err, "obj_load", "err %d\n", err))
		goto cleanup;

	results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss");
	if (CHECK(results_map_fd < 0, "find_bss_map",
		  "err %d\n", results_map_fd))
		goto cleanup;

	for (i = 0; i < prog_count; i++) {
		kprobe_links[i] = bpf_program__attach(kprobe_progs[i]);
		if (!ASSERT_OK_PTR(kprobe_links[i], "attach_kprobe"))
			goto cleanup;
	}

	memset(&curr, 0, sizeof(curr));
	in->sin_family = AF_INET;
	in->sin_port = htons(5555);
	in->sin_addr.s_addr = inet_addr("255.255.255.255");
	memcpy(&orig, &curr, sizeof(curr));

	sock_fd = socket(AF_INET, SOCK_STREAM, 0);
	if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd))
		goto cleanup;

	connect(sock_fd, &curr, sizeof(curr));
	close(sock_fd);

	err = bpf_map_lookup_elem(results_map_fd, &zero, &tmp);
	if (CHECK(err, "get_kprobe_res",
		  "failed to get kprobe res: %d\n", err))
		goto cleanup;

	in = (struct sockaddr_in *)&tmp;
	if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res",
		  "wrong kprobe res from probe read: %s:%u\n",
		  inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
		goto cleanup;

	memset(&tmp, 0xab, sizeof(tmp));

	in = (struct sockaddr_in *)&curr;
	if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res",
		  "wrong kprobe res from probe write: %s:%u\n",
		  inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
		goto cleanup;
cleanup:
	for (i = 0; i < prog_count; i++)
		bpf_link__destroy(kprobe_links[i]);
	bpf_object__close(obj);
}