selftests/bpf: Add fexit tests for BPF trampoline

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2019 Facebook */

#include <test_progs.h>

void test_fexit_test(void)

{

	struct bpf_prog_load_attr attr = {

		.file = "./fexit_test.o",

	};

	char prog_name[] = "fexit/bpf_fentry_testX";

	struct bpf_object *obj = NULL, *pkt_obj;

	int err, pkt_fd, kfree_skb_fd, i;

	struct bpf_link *link[6] = {};

	struct bpf_program *prog[6];

	__u32 duration, retval;

	struct bpf_map *data_map;

	const int zero = 0;

	u64 result[6];

	err = bpf_prog_load("./test_pkt_access.o", BPF_PROG_TYPE_SCHED_CLS,

			    &pkt_obj, &pkt_fd);

	if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))

		return;

	err = bpf_prog_load_xattr(&attr, &obj, &kfree_skb_fd);

	if (CHECK(err, "prog_load fail", "err %d errno %d\n", err, errno))

		goto close_prog;

	for (i = 0; i < 6; i++) {

		prog_name[sizeof(prog_name) - 2] = '1' + i;

		prog[i] = bpf_object__find_program_by_title(obj, prog_name);

		if (CHECK(!prog[i], "find_prog", "prog %s not found\n", prog_name))

			goto close_prog;

		link[i] = bpf_program__attach_trace(prog[i]);

		if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n"))

			goto close_prog;

	}

	data_map = bpf_object__find_map_by_name(obj, "fexit_te.bss");

	if (CHECK(!data_map, "find_data_map", "data map not found\n"))

		goto close_prog;

	err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6),

				NULL, NULL, &retval, &duration);

	CHECK(err || retval, "ipv6",

	      "err %d errno %d retval %d duration %d\n",

	      err, errno, retval, duration);

	err = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, &result);

	if (CHECK(err, "get_result",

		  "failed to get output data: %d\n", err))

		goto close_prog;

	for (i = 0; i < 6; i++)

		if (CHECK(result[i] != 1, "result", "bpf_fentry_test%d failed err %ld\n",

			  i + 1, result[i]))

			goto close_prog;

close_prog:

	for (i = 0; i < 6; i++)

		if (!IS_ERR_OR_NULL(link[i]))

			bpf_link__destroy(link[i]);

	bpf_object__close(obj);

	bpf_object__close(pkt_obj);

}

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2019 Facebook */

#include <linux/bpf.h>

#include "bpf_helpers.h"

char _license[] SEC("license") = "GPL";

struct test1 {

	ks32 a;

	ks32 ret;

};

static volatile __u64 test1_result;

SEC("fexit/bpf_fentry_test1")

int test1(struct test1 *ctx)

{

	test1_result = ctx->a == 1 && ctx->ret == 2;

	return 0;

}

struct test2 {

	ks32 a;

	ku64 b;

	ks32 ret;

};

static volatile __u64 test2_result;

SEC("fexit/bpf_fentry_test2")

int test2(struct test2 *ctx)

{

	test2_result = ctx->a == 2 && ctx->b == 3 && ctx->ret == 5;

	return 0;

}

struct test3 {

	ks8 a;

	ks32 b;

	ku64 c;

	ks32 ret;

};

static volatile __u64 test3_result;

SEC("fexit/bpf_fentry_test3")

int test3(struct test3 *ctx)

{

	test3_result = ctx->a == 4 && ctx->b == 5 && ctx->c == 6 &&

		ctx->ret == 15;

	return 0;

}

struct test4 {

	void *a;

	ks8 b;

	ks32 c;

	ku64 d;

	ks32 ret;

};

static volatile __u64 test4_result;

SEC("fexit/bpf_fentry_test4")

int test4(struct test4 *ctx)

{

	test4_result = ctx->a == (void *)7 && ctx->b == 8 && ctx->c == 9 &&

		ctx->d == 10 && ctx->ret == 34;

	return 0;

}

struct test5 {

	ku64 a;

	void *b;

	ks16 c;

	ks32 d;

	ku64 e;

	ks32 ret;

};

static volatile __u64 test5_result;

SEC("fexit/bpf_fentry_test5")

int test5(struct test5 *ctx)

{

	test5_result = ctx->a == 11 && ctx->b == (void *)12 && ctx->c == 13 &&

		ctx->d == 14 && ctx->e == 15 && ctx->ret == 65;

	return 0;

}

struct test6 {

	ku64 a;

	void *b;

	ks16 c;

	ks32 d;

	void *e;

	ks64 f;

	ks32 ret;

};

static volatile __u64 test6_result;

SEC("fexit/bpf_fentry_test6")

int test6(struct test6 *ctx)

{

	test6_result = ctx->a == 16 && ctx->b == (void *)17 && ctx->c == 18 &&

		ctx->d == 19 && ctx->e == (void *)20 && ctx->f == 21 &&

		ctx->ret == 111;

	return 0;

}