// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include <network_helpers.h>
#include "kfunc_call_fail.skel.h"
#include "kfunc_call_test.skel.h"
#include "kfunc_call_test.lskel.h"
#include "kfunc_call_test_subprog.skel.h"
#include "kfunc_call_test_subprog.lskel.h"
#include "kfunc_call_destructive.skel.h"
#include "cap_helpers.h"
static size_t log_buf_sz = 1048576; /* 1 MB */
static char obj_log_buf[1048576];
enum kfunc_test_type {
tc_test = 0,
syscall_test,
syscall_null_ctx_test,
};
struct kfunc_test_params {
const char *prog_name;
unsigned long lskel_prog_desc_offset;
int retval;
enum kfunc_test_type test_type;
const char *expected_err_msg;
};
#define __BPF_TEST_SUCCESS(name, __retval, type) \
{ \
.prog_name = #name, \
.lskel_prog_desc_offset = offsetof(struct kfunc_call_test_lskel, progs.name), \
.retval = __retval, \
.test_type = type, \
.expected_err_msg = NULL, \
}
#define __BPF_TEST_FAIL(name, __retval, type, error_msg) \
{ \
.prog_name = #name, \
.lskel_prog_desc_offset = 0 /* unused when test is failing */, \
.retval = __retval, \
.test_type = type, \
.expected_err_msg = error_msg, \
}
#define TC_TEST(name, retval) __BPF_TEST_SUCCESS(name, retval, tc_test)
#define SYSCALL_TEST(name, retval) __BPF_TEST_SUCCESS(name, retval, syscall_test)
#define SYSCALL_NULL_CTX_TEST(name, retval) __BPF_TEST_SUCCESS(name, retval, syscall_null_ctx_test)
#define TC_FAIL(name, retval, error_msg) __BPF_TEST_FAIL(name, retval, tc_test, error_msg)
#define SYSCALL_NULL_CTX_FAIL(name, retval, error_msg) \
__BPF_TEST_FAIL(name, retval, syscall_null_ctx_test, error_msg)
static struct kfunc_test_params kfunc_tests[] = {
/* failure cases:
* if retval is 0 -> the program will fail to load and the error message is an error
* if retval is not 0 -> the program can be loaded but running it will gives the
* provided return value. The error message is thus the one
* from a successful load
*/
SYSCALL_NULL_CTX_FAIL(kfunc_syscall_test_fail, -EINVAL, "processed 4 insns"),
SYSCALL_NULL_CTX_FAIL(kfunc_syscall_test_null_fail, -EINVAL, "processed 4 insns"),
TC_FAIL(kfunc_call_test_get_mem_fail_rdonly, 0, "R0 cannot write into rdonly_mem"),
TC_FAIL(kfunc_call_test_get_mem_fail_use_after_free, 0, "invalid mem access 'scalar'"),
TC_FAIL(kfunc_call_test_get_mem_fail_oob, 0, "min value is outside of the allowed memory range"),
TC_FAIL(kfunc_call_test_get_mem_fail_not_const, 0, "is not a const"),
TC_FAIL(kfunc_call_test_mem_acquire_fail, 0, "acquire kernel function does not return PTR_TO_BTF_ID"),
TC_FAIL(kfunc_call_test_pointer_arg_type_mismatch, 0, "arg#0 expected pointer to ctx, but got scalar"),
/* success cases */
TC_TEST(kfunc_call_test1, 12),
TC_TEST(kfunc_call_test2, 3),
TC_TEST(kfunc_call_test4, -1234),
TC_TEST(kfunc_call_test_ref_btf_id, 0),
TC_TEST(kfunc_call_test_get_mem, 42),
SYSCALL_TEST(kfunc_syscall_test, 0),
SYSCALL_NULL_CTX_TEST(kfunc_syscall_test_null, 0),
TC_TEST(kfunc_call_test_static_unused_arg, 0),
TC_TEST(kfunc_call_ctx, 0),
};
struct syscall_test_args {
__u8 data[16];
size_t size;
};
static void verify_success(struct kfunc_test_params *param)
{
struct kfunc_call_test_lskel *lskel = NULL;
LIBBPF_OPTS(bpf_test_run_opts, topts);
struct bpf_prog_desc *lskel_prog;
struct kfunc_call_test *skel;
struct bpf_program *prog;
int prog_fd, err;
struct syscall_test_args args = {
.size = 10,
};
switch (param->test_type) {
case syscall_test:
topts.ctx_in = &args;
topts.ctx_size_in = sizeof(args);
/* fallthrough */
case syscall_null_ctx_test:
break;
case tc_test:
topts.data_in = &pkt_v4;
topts.data_size_in = sizeof(pkt_v4);
topts.repeat = 1;
break;
}
/* first test with normal libbpf */
skel = kfunc_call_test__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel"))
return;
prog = bpf_object__find_program_by_name(skel->obj, param->prog_name);
if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
goto cleanup;
prog_fd = bpf_program__fd(prog);
err = bpf_prog_test_run_opts(prog_fd, &topts);
if (!ASSERT_OK(err, param->prog_name))
goto cleanup;
if (!ASSERT_EQ(topts.retval, param->retval, "retval"))
goto cleanup;
/* second test with light skeletons */
lskel = kfunc_call_test_lskel__open_and_load();
if (!ASSERT_OK_PTR(lskel, "lskel"))
goto cleanup;
lskel_prog = (struct bpf_prog_desc *)((char *)lskel + param->lskel_prog_desc_offset);
prog_fd = lskel_prog->prog_fd;
err = bpf_prog_test_run_opts(prog_fd, &topts);
if (!ASSERT_OK(err, param->prog_name))
goto cleanup;
ASSERT_EQ(topts.retval, param->retval, "retval");
cleanup:
kfunc_call_test__destroy(skel);
if (lskel)
kfunc_call_test_lskel__destroy(lskel);
}
static void verify_fail(struct kfunc_test_params *param)
{
LIBBPF_OPTS(bpf_object_open_opts, opts);
LIBBPF_OPTS(bpf_test_run_opts, topts);
struct bpf_program *prog;
struct kfunc_call_fail *skel;
int prog_fd, err;
struct syscall_test_args args = {
.size = 10,
};
opts.kernel_log_buf = obj_log_buf;
opts.kernel_log_size = log_buf_sz;
opts.kernel_log_level = 1;
switch (param->test_type) {
case syscall_test:
topts.ctx_in = &args;
topts.ctx_size_in = sizeof(args);
/* fallthrough */
case syscall_null_ctx_test:
break;
case tc_test:
topts.data_in = &pkt_v4;
topts.data_size_in = sizeof(pkt_v4);
topts.repeat = 1;
break;
}
skel = kfunc_call_fail__open_opts(&opts);
if (!ASSERT_OK_PTR(skel, "kfunc_call_fail__open_opts"))
goto cleanup;
prog = bpf_object__find_program_by_name(skel->obj, param->prog_name);
if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
goto cleanup;
bpf_program__set_autoload(prog, true);
err = kfunc_call_fail__load(skel);
if (!param->retval) {
/* the verifier is supposed to complain and refuses to load */
if (!ASSERT_ERR(err, "unexpected load success"))
goto out_err;
} else {
/* the program is loaded but must dynamically fail */
if (!ASSERT_OK(err, "unexpected load error"))
goto out_err;
prog_fd = bpf_program__fd(prog);
err = bpf_prog_test_run_opts(prog_fd, &topts);
if (!ASSERT_EQ(err, param->retval, param->prog_name))
goto out_err;
}
out_err:
if (!ASSERT_OK_PTR(strstr(obj_log_buf, param->expected_err_msg), "expected_err_msg")) {
fprintf(stderr, "Expected err_msg: %s\n", param->expected_err_msg);
fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
}
cleanup:
kfunc_call_fail__destroy(skel);
}
static void test_main(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(kfunc_tests); i++) {
if (!test__start_subtest(kfunc_tests[i].prog_name))
continue;
if (!kfunc_tests[i].expected_err_msg)
verify_success(&kfunc_tests[i]);
else
verify_fail(&kfunc_tests[i]);
}
}
static void test_subprog(void)
{
struct kfunc_call_test_subprog *skel;
int prog_fd, err;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
skel = kfunc_call_test_subprog__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel"))
return;
prog_fd = bpf_program__fd(skel->progs.kfunc_call_test1);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "bpf_prog_test_run(test1)");
ASSERT_EQ(topts.retval, 10, "test1-retval");
ASSERT_NEQ(skel->data->active_res, -1, "active_res");
ASSERT_EQ(skel->data->sk_state_res, BPF_TCP_CLOSE, "sk_state_res");
kfunc_call_test_subprog__destroy(skel);
}
static void test_subprog_lskel(void)
{
struct kfunc_call_test_subprog_lskel *skel;
int prog_fd, err;
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.repeat = 1,
);
skel = kfunc_call_test_subprog_lskel__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel"))
return;
prog_fd = skel->progs.kfunc_call_test1.prog_fd;
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "bpf_prog_test_run(test1)");
ASSERT_EQ(topts.retval, 10, "test1-retval");
ASSERT_NEQ(skel->data->active_res, -1, "active_res");
ASSERT_EQ(skel->data->sk_state_res, BPF_TCP_CLOSE, "sk_state_res");
kfunc_call_test_subprog_lskel__destroy(skel);
}
static int test_destructive_open_and_load(void)
{
struct kfunc_call_destructive *skel;
int err;
skel = kfunc_call_destructive__open();
if (!ASSERT_OK_PTR(skel, "prog_open"))
return -1;
err = kfunc_call_destructive__load(skel);
kfunc_call_destructive__destroy(skel);
return err;
}
static void test_destructive(void)
{
__u64 save_caps = 0;
ASSERT_OK(test_destructive_open_and_load(), "successful_load");
if (!ASSERT_OK(cap_disable_effective(1ULL << CAP_SYS_BOOT, &save_caps), "drop_caps"))
return;
ASSERT_EQ(test_destructive_open_and_load(), -13, "no_caps_failure");
cap_enable_effective(save_caps, NULL);
}
void test_kfunc_call(void)
{
test_main();
if (test__start_subtest("subprog"))
test_subprog();
if (test__start_subtest("subprog_lskel"))
test_subprog_lskel();
if (test__start_subtest("destructive"))
test_destructive();
}
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