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

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include <network_helpers.h>
#include "type_cast.skel.h"

static void test_xdp(void)
{
	struct type_cast *skel;
	int err, prog_fd;
	char buf[128];

	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,
	);

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

	bpf_program__set_autoload(skel->progs.md_xdp, true);
	err = type_cast__load(skel);
	if (!ASSERT_OK(err, "skel_load"))
		goto out;

	prog_fd = bpf_program__fd(skel->progs.md_xdp);
	err = bpf_prog_test_run_opts(prog_fd, &topts);
	ASSERT_OK(err, "test_run");
	ASSERT_EQ(topts.retval, XDP_PASS, "xdp test_run retval");

	ASSERT_EQ(skel->bss->ifindex, 1, "xdp_md ifindex");
	ASSERT_EQ(skel->bss->ifindex, skel->bss->ingress_ifindex, "xdp_md ingress_ifindex");
	ASSERT_STREQ(skel->bss->name, "lo", "xdp_md name");
	ASSERT_NEQ(skel->bss->inum, 0, "xdp_md inum");

out:
	type_cast__destroy(skel);
}

static void test_tc(void)
{
	struct type_cast *skel;
	int err, prog_fd;

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

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

	bpf_program__set_autoload(skel->progs.md_skb, true);
	err = type_cast__load(skel);
	if (!ASSERT_OK(err, "skel_load"))
		goto out;

	prog_fd = bpf_program__fd(skel->progs.md_skb);
	err = bpf_prog_test_run_opts(prog_fd, &topts);
	ASSERT_OK(err, "test_run");
	ASSERT_EQ(topts.retval, 0, "tc test_run retval");

	ASSERT_EQ(skel->bss->meta_len, 0, "skb meta_len");
	ASSERT_EQ(skel->bss->frag0_len, 0, "skb frag0_len");
	ASSERT_NEQ(skel->bss->kskb_len, 0, "skb len");
	ASSERT_NEQ(skel->bss->kskb2_len, 0, "skb2 len");
	ASSERT_EQ(skel->bss->kskb_len, skel->bss->kskb2_len, "skb len compare");

out:
	type_cast__destroy(skel);
}

static const char * const negative_tests[] = {
	"untrusted_ptr",
	"kctx_u64",
};

static void test_negative(void)
{
	struct bpf_program *prog;
	struct type_cast *skel;
	int i, err;

	for (i = 0; i < ARRAY_SIZE(negative_tests); i++) {
		skel = type_cast__open();
		if (!ASSERT_OK_PTR(skel, "skel_open"))
			return;

		prog = bpf_object__find_program_by_name(skel->obj, negative_tests[i]);
		if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
			goto out;
		bpf_program__set_autoload(prog, true);
		err = type_cast__load(skel);
		ASSERT_ERR(err, "skel_load");
out:
		type_cast__destroy(skel);
	}
}

void test_type_cast(void)
{
	if (test__start_subtest("xdp"))
		test_xdp();
	if (test__start_subtest("tc"))
		test_tc();
	if (test__start_subtest("negative"))
		test_negative();
}