linux/tools/testing/selftests/bpf/prog_tests/dynptr.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Facebook */

#include <test_progs.h>
#include <network_helpers.h>
#include "dynptr_fail.skel.h"
#include "dynptr_success.skel.h"

enum test_setup_type {
	SETUP_SYSCALL_SLEEP,
	SETUP_SKB_PROG,
	SETUP_SKB_PROG_TP,
	SETUP_XDP_PROG,
};

static struct {
	const char *prog_name;
	enum test_setup_type type;
} success_tests[] = {
	{"test_read_write", SETUP_SYSCALL_SLEEP},
	{"test_dynptr_data", SETUP_SYSCALL_SLEEP},
	{"test_dynptr_copy", SETUP_SYSCALL_SLEEP},
	{"test_dynptr_copy_xdp", SETUP_XDP_PROG},
	{"test_ringbuf", SETUP_SYSCALL_SLEEP},
	{"test_skb_readonly", SETUP_SKB_PROG},
	{"test_dynptr_skb_data", SETUP_SKB_PROG},
	{"test_adjust", SETUP_SYSCALL_SLEEP},
	{"test_adjust_err", SETUP_SYSCALL_SLEEP},
	{"test_zero_size_dynptr", SETUP_SYSCALL_SLEEP},
	{"test_dynptr_is_null", SETUP_SYSCALL_SLEEP},
	{"test_dynptr_is_rdonly", SETUP_SKB_PROG},
	{"test_dynptr_clone", SETUP_SKB_PROG},
	{"test_dynptr_skb_no_buff", SETUP_SKB_PROG},
	{"test_dynptr_skb_strcmp", SETUP_SKB_PROG},
	{"test_dynptr_skb_tp_btf", SETUP_SKB_PROG_TP},
	{"test_probe_read_user_dynptr", SETUP_XDP_PROG},
	{"test_probe_read_kernel_dynptr", SETUP_XDP_PROG},
	{"test_probe_read_user_str_dynptr", SETUP_XDP_PROG},
	{"test_probe_read_kernel_str_dynptr", SETUP_XDP_PROG},
	{"test_copy_from_user_dynptr", SETUP_SYSCALL_SLEEP},
	{"test_copy_from_user_str_dynptr", SETUP_SYSCALL_SLEEP},
	{"test_copy_from_user_task_dynptr", SETUP_SYSCALL_SLEEP},
	{"test_copy_from_user_task_str_dynptr", SETUP_SYSCALL_SLEEP},
};

static void verify_success(const char *prog_name, enum test_setup_type setup_type)
{
	char user_data[384] = {[0 ... 382] = 'a', '\0'};
	struct dynptr_success *skel;
	struct bpf_program *prog;
	struct bpf_link *link;
	int err;

	skel = dynptr_success__open();
	if (!ASSERT_OK_PTR(skel, "dynptr_success__open"))
		return;

	skel->bss->pid = getpid();

	prog = bpf_object__find_program_by_name(skel->obj, prog_name);
	if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
		goto cleanup;

	bpf_program__set_autoload(prog, true);

	err = dynptr_success__load(skel);
	if (!ASSERT_OK(err, "dynptr_success__load"))
		goto cleanup;

	skel->bss->user_ptr = user_data;
	skel->data->test_len[0] = sizeof(user_data);
	memcpy(skel->bss->expected_str, user_data, sizeof(user_data));

	switch (setup_type) {
	case SETUP_SYSCALL_SLEEP:
		link = bpf_program__attach(prog);
		if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
			goto cleanup;

		usleep(1);

		bpf_link__destroy(link);
		break;
	case SETUP_SKB_PROG:
	{
		int prog_fd;
		char buf[64];

		LIBBPF_OPTS(bpf_test_run_opts, topts,
			    .data_in = &pkt_v4,
			    .data_size_in = sizeof(pkt_v4),
			    .data_out = buf,
			    .data_size_out = sizeof(buf),
			    .repeat = 1,
		);

		prog_fd = bpf_program__fd(prog);
		if (!ASSERT_GE(prog_fd, 0, "prog_fd"))
			goto cleanup;

		err = bpf_prog_test_run_opts(prog_fd, &topts);

		if (!ASSERT_OK(err, "test_run"))
			goto cleanup;

		break;
	}
	case SETUP_SKB_PROG_TP:
	{
		struct __sk_buff skb = {};
		struct bpf_object *obj;
		int aux_prog_fd;

		/* Just use its test_run to trigger kfree_skb tracepoint */
		err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
					 &obj, &aux_prog_fd);
		if (!ASSERT_OK(err, "prog_load sched cls"))
			goto cleanup;

		LIBBPF_OPTS(bpf_test_run_opts, topts,
			    .data_in = &pkt_v4,
			    .data_size_in = sizeof(pkt_v4),
			    .ctx_in = &skb,
			    .ctx_size_in = sizeof(skb),
		);

		link = bpf_program__attach(prog);
		if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
			goto cleanup;

		err = bpf_prog_test_run_opts(aux_prog_fd, &topts);
		bpf_link__destroy(link);

		if (!ASSERT_OK(err, "test_run"))
			goto cleanup;

		break;
	}
	case SETUP_XDP_PROG:
	{
		char data[5000];
		int err, prog_fd;
		LIBBPF_OPTS(bpf_test_run_opts, opts,
			    .data_in = &data,
			    .data_size_in = sizeof(data),
			    .repeat = 1,
		);

		prog_fd = bpf_program__fd(prog);
		err = bpf_prog_test_run_opts(prog_fd, &opts);

		if (!ASSERT_OK(err, "test_run"))
			goto cleanup;

		break;
	}
	}

	ASSERT_EQ(skel->bss->err, 0, "err");

cleanup:
	dynptr_success__destroy(skel);
}

void test_dynptr(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(success_tests); i++) {
		if (!test__start_subtest(success_tests[i].prog_name))
			continue;

		verify_success(success_tests[i].prog_name, success_tests[i].type);
	}

	RUN_TESTS(dynptr_fail);
}