Commit 8909b3fb authored by Menglong Dong's avatar Menglong Dong Committed by Alexei Starovoitov
Browse files

selftests/bpf: add testcases for fsession cookie 



Test session cookie for fsession. Multiple fsession BPF progs is attached
to bpf_fentry_test1() and session cookie is read and write in the
testcase.

bpf_get_func_ip() will influence the layout of the session cookies, so we
test the cookie in two case: with and without bpf_get_func_ip().

Signed-off-by: default avatarMenglong Dong <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20260124062008.8657-13-dongml2@chinatelecom.cn


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent a5533a6e

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

+34 −0
Original line number Diff line number Diff line
@@ -77,6 +77,38 @@ static void test_fsession_reattach(void) 
	fsession_test__destroy(skel);

}



static void test_fsession_cookie(void)

{

	struct fsession_test *skel = NULL;

	int err;



	skel = fsession_test__open();

	if (!ASSERT_OK_PTR(skel, "fsession_test__open"))

		goto cleanup;



	/*

	 * The test_fsession_basic() will test the session cookie with

	 * bpf_get_func_ip() case, so we need only check

	 * the cookie without bpf_get_func_ip() case here

	 */

	bpf_program__set_autoload(skel->progs.test6, false);



	err = fsession_test__load(skel);

	if (!ASSERT_OK(err, "fsession_test__load"))

		goto cleanup;



	err = fsession_test__attach(skel);

	if (!ASSERT_OK(err, "fsession_attach"))

		goto cleanup;



	skel->bss->test6_entry_result = 1;

	skel->bss->test6_exit_result = 1;



	check_result(skel);

cleanup:

	fsession_test__destroy(skel);

}



void test_fsession_test(void)

{

#if !defined(__x86_64__)
@@ -87,4 +119,6 @@ void test_fsession_test(void) 
		test_fsession_basic();

	if (test__start_subtest("fsession_reattach"))

		test_fsession_reattach();

	if (test__start_subtest("fsession_cookie"))

		test_fsession_cookie();

}

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

+66 −0
Original line number Diff line number Diff line
@@ -95,3 +95,69 @@ int BPF_PROG(test5, struct bpf_fentry_test_t *arg, int ret) 
	return 0;

}



__u64 test6_entry_result = 0;

__u64 test6_exit_result = 0;

SEC("fsession/bpf_fentry_test1")

int BPF_PROG(test6, int a)

{

	__u64 addr = bpf_get_func_ip(ctx);



	if (bpf_session_is_return(ctx))

		test6_exit_result = (const void *) addr == &bpf_fentry_test1;

	else

		test6_entry_result = (const void *) addr == &bpf_fentry_test1;

	return 0;

}



__u64 test7_entry_ok = 0;

__u64 test7_exit_ok = 0;

SEC("fsession/bpf_fentry_test1")

int BPF_PROG(test7, int a)

{

	volatile __u64 *cookie = bpf_session_cookie(ctx);



	if (!bpf_session_is_return(ctx)) {

		*cookie = 0xAAAABBBBCCCCDDDDull;

		test7_entry_ok = *cookie == 0xAAAABBBBCCCCDDDDull;

		return 0;

	}



	test7_exit_ok = *cookie == 0xAAAABBBBCCCCDDDDull;

	return 0;

}



__u64 test8_entry_ok = 0;

__u64 test8_exit_ok = 0;



SEC("fsession/bpf_fentry_test1")

int BPF_PROG(test8, int a)

{

	volatile __u64 *cookie = bpf_session_cookie(ctx);



	if (!bpf_session_is_return(ctx)) {

		*cookie = 0x1111222233334444ull;

		test8_entry_ok = *cookie == 0x1111222233334444ull;

		return 0;

	}



	test8_exit_ok = *cookie == 0x1111222233334444ull;

	return 0;

}



__u64 test9_entry_result = 0;

__u64 test9_exit_result = 0;



SEC("fsession/bpf_fentry_test1")

int BPF_PROG(test9, int a, int ret)

{

	__u64 *cookie = bpf_session_cookie(ctx);



	if (!bpf_session_is_return(ctx)) {

		test9_entry_result = a == 1 && ret == 0;

		*cookie = 0x123456ULL;

		return 0;

	}



	test9_exit_result = a == 1 && ret == 2 && *cookie == 0x123456ULL;

	return 0;

}