linux/tools/testing/selftests/bpf/test_progs.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
 */
#include "test_progs.h"
#include "bpf_rlimit.h"
#include <argp.h>
#include <string.h>

int error_cnt, pass_cnt;
bool jit_enabled;
bool verifier_stats = false;

struct ipv4_packet pkt_v4 = {
	.eth.h_proto = __bpf_constant_htons(ETH_P_IP),
	.iph.ihl = 5,
	.iph.protocol = IPPROTO_TCP,
	.iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
	.tcp.urg_ptr = 123,
	.tcp.doff = 5,
};

struct ipv6_packet pkt_v6 = {
	.eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
	.iph.nexthdr = IPPROTO_TCP,
	.iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
	.tcp.urg_ptr = 123,
	.tcp.doff = 5,
};

int bpf_find_map(const char *test, struct bpf_object *obj, const char *name)
{
	struct bpf_map *map;

	map = bpf_object__find_map_by_name(obj, name);
	if (!map) {
		printf("%s:FAIL:map '%s' not found\n", test, name);
		error_cnt++;
		return -1;
	}
	return bpf_map__fd(map);
}

static bool is_jit_enabled(void)
{
	const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable";
	bool enabled = false;
	int sysctl_fd;

	sysctl_fd = open(jit_sysctl, 0, O_RDONLY);
	if (sysctl_fd != -1) {
		char tmpc;

		if (read(sysctl_fd, &tmpc, sizeof(tmpc)) == 1)
			enabled = (tmpc != '0');
		close(sysctl_fd);
	}

	return enabled;
}

int compare_map_keys(int map1_fd, int map2_fd)
{
	__u32 key, next_key;
	char val_buf[PERF_MAX_STACK_DEPTH *
		     sizeof(struct bpf_stack_build_id)];
	int err;

	err = bpf_map_get_next_key(map1_fd, NULL, &key);
	if (err)
		return err;
	err = bpf_map_lookup_elem(map2_fd, &key, val_buf);
	if (err)
		return err;

	while (bpf_map_get_next_key(map1_fd, &key, &next_key) == 0) {
		err = bpf_map_lookup_elem(map2_fd, &next_key, val_buf);
		if (err)
			return err;

		key = next_key;
	}
	if (errno != ENOENT)
		return -1;

	return 0;
}

int compare_stack_ips(int smap_fd, int amap_fd, int stack_trace_len)
{
	__u32 key, next_key, *cur_key_p, *next_key_p;
	char *val_buf1, *val_buf2;
	int i, err = 0;

	val_buf1 = malloc(stack_trace_len);
	val_buf2 = malloc(stack_trace_len);
	cur_key_p = NULL;
	next_key_p = &key;
	while (bpf_map_get_next_key(smap_fd, cur_key_p, next_key_p) == 0) {
		err = bpf_map_lookup_elem(smap_fd, next_key_p, val_buf1);
		if (err)
			goto out;
		err = bpf_map_lookup_elem(amap_fd, next_key_p, val_buf2);
		if (err)
			goto out;
		for (i = 0; i < stack_trace_len; i++) {
			if (val_buf1[i] != val_buf2[i]) {
				err = -1;
				goto out;
			}
		}
		key = *next_key_p;
		cur_key_p = &key;
		next_key_p = &next_key;
	}
	if (errno != ENOENT)
		err = -1;

out:
	free(val_buf1);
	free(val_buf2);
	return err;
}

int extract_build_id(char *build_id, size_t size)
{
	FILE *fp;
	char *line = NULL;
	size_t len = 0;

	fp = popen("readelf -n ./urandom_read | grep 'Build ID'", "r");
	if (fp == NULL)
		return -1;

	if (getline(&line, &len, fp) == -1)
		goto err;
	fclose(fp);

	if (len > size)
		len = size;
	memcpy(build_id, line, len);
	build_id[len] = '\0';
	return 0;
err:
	fclose(fp);
	return -1;
}

void *spin_lock_thread(void *arg)
{
	__u32 duration, retval;
	int err, prog_fd = *(u32 *) arg;

	err = bpf_prog_test_run(prog_fd, 10000, &pkt_v4, sizeof(pkt_v4),
				NULL, NULL, &retval, &duration);
	CHECK(err || retval, "",
	      "err %d errno %d retval %d duration %d\n",
	      err, errno, retval, duration);
	pthread_exit(arg);
}

/* extern declarations for test funcs */
#define DEFINE_TEST(name) extern void test_##name();
#include <prog_tests/tests.h>
#undef DEFINE_TEST

struct prog_test_def {
	const char *test_name;
	int test_num;
	void (*run_test)(void);
};

static struct prog_test_def prog_test_defs[] = {
#define DEFINE_TEST(name) {	      \
	.test_name = #name,	      \
	.run_test = &test_##name,   \
},
#include <prog_tests/tests.h>
#undef DEFINE_TEST
};

const char *argp_program_version = "test_progs 0.1";
const char *argp_program_bug_address = "<bpf@vger.kernel.org>";
const char argp_program_doc[] = "BPF selftests test runner";

enum ARG_KEYS {
	ARG_TEST_NUM = 'n',
	ARG_TEST_NAME = 't',
	ARG_VERIFIER_STATS = 's',
};
	
static const struct argp_option opts[] = {
	{ "num", ARG_TEST_NUM, "NUM", 0,
	  "Run test number NUM only " },
	{ "name", ARG_TEST_NAME, "NAME", 0,
	  "Run tests with names containing NAME" },
	{ "verifier-stats", ARG_VERIFIER_STATS, NULL, 0,
	  "Output verifier statistics", },
	{},
};

struct test_env {
	int test_num_selector;
	const char *test_name_selector;
	bool verifier_stats;
};

static struct test_env env = {
	.test_num_selector = -1,
};

static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
	struct test_env *env = state->input;

	switch (key) {
	case ARG_TEST_NUM: {
		int test_num;

		errno = 0;
		test_num = strtol(arg, NULL, 10);
		if (errno)
			return -errno;
		env->test_num_selector = test_num;
		break;
	}
	case ARG_TEST_NAME:
		env->test_name_selector = arg;
		break;
	case ARG_VERIFIER_STATS:
		env->verifier_stats = true;
		break;
	case ARGP_KEY_ARG:
		argp_usage(state);
		break;
	case ARGP_KEY_END:
		break;
	default:
		return ARGP_ERR_UNKNOWN;
	}
	return 0;
}


int main(int argc, char **argv)
{
	static const struct argp argp = {
		.options = opts,
		.parser = parse_arg,
		.doc = argp_program_doc,
	};
	struct prog_test_def *test;
	int err, i;

	err = argp_parse(&argp, argc, argv, 0, NULL, &env);
	if (err)
		return err;

	srand(time(NULL));

	jit_enabled = is_jit_enabled();

	verifier_stats = env.verifier_stats;

	for (i = 0; i < ARRAY_SIZE(prog_test_defs); i++) {
		test = &prog_test_defs[i];

		test->test_num = i + 1;

		if (env.test_num_selector >= 0 &&
		    test->test_num != env.test_num_selector)
			continue;
		if (env.test_name_selector &&
		    !strstr(test->test_name, env.test_name_selector))
			continue;

		test->run_test();
	}

	printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
	return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
}