test_maps.c

/*
 * Testsuite for eBPF maps
 *
 * Copyright (c) 2014 PLUMgrid, http://plumgrid.com
 * Copyright (c) 2016 Facebook
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>

#include <sys/wait.h>
#include <sys/resource.h>

#include <linux/bpf.h>

#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "bpf_util.h"

static int map_flags;

static void test_hashmap(int task, void *data)
{
	long long key, next_key, first_key, value;
	int fd;

	fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value),
			    2, map_flags);
	if (fd < 0) {
		printf("Failed to create hashmap '%s'!\n", strerror(errno));
		exit(1);
	}

	key = 1;
	value = 1234;
	/* Insert key=1 element. */
	assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == 0);

	value = 0;
	/* BPF_NOEXIST means add new element if it doesn't exist. */
	assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == -1 &&
	       /* key=1 already exists. */
	       errno == EEXIST);

	/* -1 is an invalid flag. */
	assert(bpf_map_update_elem(fd, &key, &value, -1) == -1 &&
	       errno == EINVAL);

	/* Check that key=1 can be found. */
	assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 1234);

	key = 2;
	/* Check that key=2 is not found. */
	assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == ENOENT);

	/* BPF_EXIST means update existing element. */
	assert(bpf_map_update_elem(fd, &key, &value, BPF_EXIST) == -1 &&
	       /* key=2 is not there. */
	       errno == ENOENT);

	/* Insert key=2 element. */
	assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == 0);

	/* key=1 and key=2 were inserted, check that key=0 cannot be
	 * inserted due to max_entries limit.
	 */
	key = 0;
	assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == -1 &&
	       errno == E2BIG);

	/* Update existing element, though the map is full. */
	key = 1;
	assert(bpf_map_update_elem(fd, &key, &value, BPF_EXIST) == 0);
	key = 2;
	assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == 0);
	key = 3;
	assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == -1 &&
	       errno == E2BIG);

	/* Check that key = 0 doesn't exist. */
	key = 0;
	assert(bpf_map_delete_elem(fd, &key) == -1 && errno == ENOENT);

	/* Iterate over two elements. */
	assert(bpf_map_get_next_key(fd, NULL, &first_key) == 0 &&
	       (first_key == 1 || first_key == 2));
	assert(bpf_map_get_next_key(fd, &key, &next_key) == 0 &&
	       (next_key == first_key));
	assert(bpf_map_get_next_key(fd, &next_key, &next_key) == 0 &&
	       (next_key == 1 || next_key == 2) &&
	       (next_key != first_key));
	assert(bpf_map_get_next_key(fd, &next_key, &next_key) == -1 &&
	       errno == ENOENT);

	/* Delete both elements. */
	key = 1;
	assert(bpf_map_delete_elem(fd, &key) == 0);
	key = 2;
	assert(bpf_map_delete_elem(fd, &key) == 0);
	assert(bpf_map_delete_elem(fd, &key) == -1 && errno == ENOENT);

	key = 0;
	/* Check that map is empty. */
	assert(bpf_map_get_next_key(fd, NULL, &next_key) == -1 &&
	       errno == ENOENT);
	assert(bpf_map_get_next_key(fd, &key, &next_key) == -1 &&
	       errno == ENOENT);

	close(fd);
}

static void test_hashmap_sizes(int task, void *data)
{
	int fd, i, j;

	for (i = 1; i <= 512; i <<= 1)
		for (j = 1; j <= 1 << 18; j <<= 1) {
			fd = bpf_create_map(BPF_MAP_TYPE_HASH, i, j,
					    2, map_flags);
			if (fd < 0) {
				printf("Failed to create hashmap key=%d value=%d '%s'\n",
				       i, j, strerror(errno));
				exit(1);
			}
			close(fd);
			usleep(10); /* give kernel time to destroy */
		}
}

static void test_hashmap_percpu(int task, void *data)
{
	unsigned int nr_cpus = bpf_num_possible_cpus();
	BPF_DECLARE_PERCPU(long, value);
	long long key, next_key, first_key;
	int expected_key_mask = 0;
	int fd, i;

	fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_HASH, sizeof(key),
			    sizeof(bpf_percpu(value, 0)), 2, map_flags);
	if (fd < 0) {
		printf("Failed to create hashmap '%s'!\n", strerror(errno));
		exit(1);
	}

	for (i = 0; i < nr_cpus; i++)
		bpf_percpu(value, i) = i + 100;

	key = 1;
	/* Insert key=1 element. */
	assert(!(expected_key_mask & key));
	assert(bpf_map_update_elem(fd, &key, value, BPF_ANY) == 0);
	expected_key_mask |= key;

	/* BPF_NOEXIST means add new element if it doesn't exist. */
	assert(bpf_map_update_elem(fd, &key, value, BPF_NOEXIST) == -1 &&
	       /* key=1 already exists. */
	       errno == EEXIST);

	/* -1 is an invalid flag. */
	assert(bpf_map_update_elem(fd, &key, value, -1) == -1 &&
	       errno == EINVAL);

	/* Check that key=1 can be found. Value could be 0 if the lookup
	 * was run from a different CPU.
	 */
	bpf_percpu(value, 0) = 1;
	assert(bpf_map_lookup_elem(fd, &key, value) == 0 &&
	       bpf_percpu(value, 0) == 100);

	key = 2;
	/* Check that key=2 is not found. */
	assert(bpf_map_lookup_elem(fd, &key, value) == -1 && errno == ENOENT);

	/* BPF_EXIST means update existing element. */
	assert(bpf_map_update_elem(fd, &key, value, BPF_EXIST) == -1 &&
	       /* key=2 is not there. */
	       errno == ENOENT);

	/* Insert key=2 element. */
	assert(!(expected_key_mask & key));
	assert(bpf_map_update_elem(fd, &key, value, BPF_NOEXIST) == 0);
	expected_key_mask |= key;

	/* key=1 and key=2 were inserted, check that key=0 cannot be
	 * inserted due to max_entries limit.
	 */
	key = 0;
	assert(bpf_map_update_elem(fd, &key, value, BPF_NOEXIST) == -1 &&
	       errno == E2BIG);

	/* Check that key = 0 doesn't exist. */
	assert(bpf_map_delete_elem(fd, &key) == -1 && errno == ENOENT);

	/* Iterate over two elements. */
	assert(bpf_map_get_next_key(fd, NULL, &first_key) == 0 &&
	       ((expected_key_mask & first_key) == first_key));
	while (!bpf_map_get_next_key(fd, &key, &next_key)) {
		if (first_key) {
			assert(next_key == first_key);
			first_key = 0;
		}
		assert((expected_key_mask & next_key) == next_key);
		expected_key_mask &= ~next_key;

		assert(bpf_map_lookup_elem(fd, &next_key, value) == 0);

		for (i = 0; i < nr_cpus; i++)
			assert(bpf_percpu(value, i) == i + 100);

		key = next_key;
	}
	assert(errno == ENOENT);

	/* Update with BPF_EXIST. */
	key = 1;
	assert(bpf_map_update_elem(fd, &key, value, BPF_EXIST) == 0);

	/* Delete both elements. */
	key = 1;
	assert(bpf_map_delete_elem(fd, &key) == 0);
	key = 2;
	assert(bpf_map_delete_elem(fd, &key) == 0);
	assert(bpf_map_delete_elem(fd, &key) == -1 && errno == ENOENT);

	key = 0;
	/* Check that map is empty. */
	assert(bpf_map_get_next_key(fd, NULL, &next_key) == -1 &&
	       errno == ENOENT);
	assert(bpf_map_get_next_key(fd, &key, &next_key) == -1 &&
	       errno == ENOENT);

	close(fd);
}

static void test_hashmap_walk(int task, void *data)
{
	int fd, i, max_entries = 100000;
	long long key, value, next_key;
	bool next_key_valid = true;

	fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value),
			    max_entries, map_flags);
	if (fd < 0) {
		printf("Failed to create hashmap '%s'!\n", strerror(errno));
		exit(1);
	}

	for (i = 0; i < max_entries; i++) {
		key = i; value = key;
		assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == 0);
	}

	for (i = 0; bpf_map_get_next_key(fd, !i ? NULL : &key,
					 &next_key) == 0; i++) {
		key = next_key;
		assert(bpf_map_lookup_elem(fd, &key, &value) == 0);
	}

	assert(i == max_entries);

	assert(bpf_map_get_next_key(fd, NULL, &key) == 0);
	for (i = 0; next_key_valid; i++) {
		next_key_valid = bpf_map_get_next_key(fd, &key, &next_key) == 0;
		assert(bpf_map_lookup_elem(fd, &key, &value) == 0);
		value++;
		assert(bpf_map_update_elem(fd, &key, &value, BPF_EXIST) == 0);
		key = next_key;
	}

	assert(i == max_entries);

	for (i = 0; bpf_map_get_next_key(fd, !i ? NULL : &key,
					 &next_key) == 0; i++) {
		key = next_key;
		assert(bpf_map_lookup_elem(fd, &key, &value) == 0);
		assert(value - 1 == key);
	}

	assert(i == max_entries);
	close(fd);
}

static void test_arraymap(int task, void *data)
{
	int key, next_key, fd;
	long long value;

	fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(key), sizeof(value),
			    2, 0);
	if (fd < 0) {
		printf("Failed to create arraymap '%s'!\n", strerror(errno));
		exit(1);
	}

	key = 1;
	value = 1234;
	/* Insert key=1 element. */
	assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == 0);

	value = 0;
	assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == -1 &&
	       errno == EEXIST);

	/* Check that key=1 can be found. */
	assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 1234);

	key = 0;
	/* Check that key=0 is also found and zero initialized. */
	assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 0);

	/* key=0 and key=1 were inserted, check that key=2 cannot be inserted
	 * due to max_entries limit.
	 */
	key = 2;
	assert(bpf_map_update_elem(fd, &key, &value, BPF_EXIST) == -1 &&
	       errno == E2BIG);

	/* Check that key = 2 doesn't exist. */
	assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == ENOENT);

	/* Iterate over two elements. */
	assert(bpf_map_get_next_key(fd, NULL, &next_key) == 0 &&
	       next_key == 0);
	assert(bpf_map_get_next_key(fd, &key, &next_key) == 0 &&
	       next_key == 0);
	assert(bpf_map_get_next_key(fd, &next_key, &next_key) == 0 &&
	       next_key == 1);
	assert(bpf_map_get_next_key(fd, &next_key, &next_key) == -1 &&
	       errno == ENOENT);

	/* Delete shouldn't succeed. */
	key = 1;
	assert(bpf_map_delete_elem(fd, &key) == -1 && errno == EINVAL);

	close(fd);
}

static void test_arraymap_percpu(int task, void *data)
{
	unsigned int nr_cpus = bpf_num_possible_cpus();
	BPF_DECLARE_PERCPU(long, values);
	int key, next_key, fd, i;

	fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_ARRAY, sizeof(key),
			    sizeof(bpf_percpu(values, 0)), 2, 0);
	if (fd < 0) {
		printf("Failed to create arraymap '%s'!\n", strerror(errno));
		exit(1);
	}

	for (i = 0; i < nr_cpus; i++)
		bpf_percpu(values, i) = i + 100;

	key = 1;
	/* Insert key=1 element. */
	assert(bpf_map_update_elem(fd, &key, values, BPF_ANY) == 0);

	bpf_percpu(values, 0) = 0;
	assert(bpf_map_update_elem(fd, &key, values, BPF_NOEXIST) == -1 &&
	       errno == EEXIST);

	/* Check that key=1 can be found. */
	assert(bpf_map_lookup_elem(fd, &key, values) == 0 &&
	       bpf_percpu(values, 0) == 100);

	key = 0;
	/* Check that key=0 is also found and zero initialized. */
	assert(bpf_map_lookup_elem(fd, &key, values) == 0 &&
	       bpf_percpu(values, 0) == 0 &&
	       bpf_percpu(values, nr_cpus - 1) == 0);

	/* Check that key=2 cannot be inserted due to max_entries limit. */
	key = 2;
	assert(bpf_map_update_elem(fd, &key, values, BPF_EXIST) == -1 &&
	       errno == E2BIG);

	/* Check that key = 2 doesn't exist. */
	assert(bpf_map_lookup_elem(fd, &key, values) == -1 && errno == ENOENT);

	/* Iterate over two elements. */
	assert(bpf_map_get_next_key(fd, NULL, &next_key) == 0 &&
	       next_key == 0);
	assert(bpf_map_get_next_key(fd, &key, &next_key) == 0 &&
	       next_key == 0);
	assert(bpf_map_get_next_key(fd, &next_key, &next_key) == 0 &&
	       next_key == 1);
	assert(bpf_map_get_next_key(fd, &next_key, &next_key) == -1 &&
	       errno == ENOENT);

	/* Delete shouldn't succeed. */
	key = 1;
	assert(bpf_map_delete_elem(fd, &key) == -1 && errno == EINVAL);

	close(fd);
}

static void test_arraymap_percpu_many_keys(void)
{
	unsigned int nr_cpus = bpf_num_possible_cpus();
	BPF_DECLARE_PERCPU(long, values);
	/* nr_keys is not too large otherwise the test stresses percpu
	 * allocator more than anything else
	 */
	unsigned int nr_keys = 2000;
	int key, fd, i;

	fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_ARRAY, sizeof(key),
			    sizeof(bpf_percpu(values, 0)), nr_keys, 0);
	if (fd < 0) {
		printf("Failed to create per-cpu arraymap '%s'!\n",
		       strerror(errno));
		exit(1);
	}

	for (i = 0; i < nr_cpus; i++)
		bpf_percpu(values, i) = i + 10;

	for (key = 0; key < nr_keys; key++)
		assert(bpf_map_update_elem(fd, &key, values, BPF_ANY) == 0);

	for (key = 0; key < nr_keys; key++) {
		for (i = 0; i < nr_cpus; i++)
			bpf_percpu(values, i) = 0;

		assert(bpf_map_lookup_elem(fd, &key, values) == 0);

		for (i = 0; i < nr_cpus; i++)
			assert(bpf_percpu(values, i) == i + 10);
	}

	close(fd);
}

static void test_devmap(int task, void *data)
{
	int fd;
	__u32 key, value;

	fd = bpf_create_map(BPF_MAP_TYPE_DEVMAP, sizeof(key), sizeof(value),
			    2, 0);
	if (fd < 0) {
		printf("Failed to create arraymap '%s'!\n", strerror(errno));
		exit(1);
	}

	close(fd);
}

#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <linux/err.h>
#define SOCKMAP_PARSE_PROG "./sockmap_parse_prog.o"
#define SOCKMAP_VERDICT_PROG "./sockmap_verdict_prog.o"
static void test_sockmap(int task, void *data)
{
	int ports[] = {50200, 50201, 50202, 50204};
	int err, i, fd, sfd[6] = {0xdeadbeef};
	char buf[] = "hello sockmap user\n";
	int one = 1, map_fd, s, sc, rc;
	int parse_prog, verdict_prog;
	struct bpf_map *bpf_map;
	struct sockaddr_in addr;
	struct bpf_object *obj;
	struct timeval to;
	__u32 key, value;
	fd_set w;

	/* Create some sockets to use with sockmap */
	for (i = 0; i < 2; i++) {
		sfd[i] = socket(AF_INET, SOCK_STREAM, 0);
		if (sfd[i] < 0)
			goto out;
		err = setsockopt(sfd[i], SOL_SOCKET, SO_REUSEADDR,
				 (char *)&one, sizeof(one));
		if (err) {
			printf("failed to setsockopt\n");
			goto out;
		}
		err = ioctl(sfd[i], FIONBIO, (char *)&one);
		if (err < 0) {
			printf("failed to ioctl\n");
			goto out;
		}
		memset(&addr, 0, sizeof(struct sockaddr_in));
		addr.sin_family = AF_INET;
		addr.sin_addr.s_addr = inet_addr("127.0.0.1");
		addr.sin_port = htons(ports[i]);
		err = bind(sfd[i], (struct sockaddr *)&addr, sizeof(addr));
		if (err < 0) {
			printf("failed to bind: err %i: %i:%i\n",
			       err, i, sfd[i]);
			goto out;
		}
		err = listen(sfd[i], 32);
		if (err < 0) {
			printf("failed to listeen\n");
			goto out;
		}
	}

	for (i = 2; i < 4; i++) {
		sfd[i] = socket(AF_INET, SOCK_STREAM, 0);
		if (sfd[i] < 0)
			goto out;
		err = setsockopt(sfd[i], SOL_SOCKET, SO_REUSEADDR,
				 (char *)&one, sizeof(one));
		if (err) {
			printf("set sock opt\n");
			goto out;
		}
		memset(&addr, 0, sizeof(struct sockaddr_in));
		addr.sin_family = AF_INET;
		addr.sin_addr.s_addr = inet_addr("127.0.0.1");
		addr.sin_port = htons(ports[i - 2]);
		err = connect(sfd[i], (struct sockaddr *)&addr, sizeof(addr));
		if (err) {
			printf("failed to conenct\n");
			goto out;
		}
	}


	for (i = 4; i < 6; i++) {
		sfd[i] = accept(sfd[i - 4], NULL, NULL);
		if (sfd[i] < 0) {
			printf("accept failed\n");
			goto out;
		}
	}

	/* Test sockmap with connected sockets */
	fd = bpf_create_map(BPF_MAP_TYPE_SOCKMAP,
			    sizeof(key), sizeof(value),
			    6, 0);
	if (fd < 0) {
		printf("Failed to create sockmap %i\n", fd);
		goto out_sockmap;
	}

	/* Test update without programs */
	for (i = 0; i < 6; i++) {
		err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
		if (err) {
			printf("Failed noprog update sockmap '%i:%i'\n",
			       i, sfd[i]);
			goto out_sockmap;
		}
	}

	/* Test attaching bad fds */
	err = bpf_prog_attach(-1, fd, BPF_SK_SKB_STREAM_PARSER, 0);
	if (!err) {
		printf("Failed invalid parser prog attach\n");
		goto out_sockmap;
	}

	err = bpf_prog_attach(-1, fd, BPF_SK_SKB_STREAM_VERDICT, 0);
	if (!err) {
		printf("Failed invalid verdict prog attach\n");
		goto out_sockmap;
	}

	/* Load SK_SKB program and Attach */
	err = bpf_prog_load(SOCKMAP_PARSE_PROG,
			    BPF_PROG_TYPE_SK_SKB, &obj, &parse_prog);
	if (err) {
		printf("Failed to load SK_SKB parse prog\n");
		goto out_sockmap;
	}

	err = bpf_prog_load(SOCKMAP_VERDICT_PROG,
			    BPF_PROG_TYPE_SK_SKB, &obj, &verdict_prog);
	if (err) {
		printf("Failed to load SK_SKB verdict prog\n");
		goto out_sockmap;
	}

	bpf_map = bpf_object__find_map_by_name(obj, "sock_map");
	if (IS_ERR(bpf_map)) {
		printf("Failed to load map from verdict prog\n");
		goto out_sockmap;
	}

	map_fd = bpf_map__fd(bpf_map);
	if (map_fd < 0) {
		printf("Failed to get map fd\n");
		goto out_sockmap;
	}

	err = bpf_prog_attach(parse_prog, map_fd,
		      BPF_SK_SKB_STREAM_PARSER, 0);
	if (err) {
		printf("Failed bpf prog attach\n");
		goto out_sockmap;
	}

	err = bpf_prog_attach(verdict_prog, map_fd,
			      BPF_SK_SKB_STREAM_VERDICT, 0);
	if (err) {
		printf("Failed bpf prog attach\n");
		goto out_sockmap;
	}

	/* Test map update elem afterwards fd lives in fd and map_fd */
	for (i = 0; i < 6; i++) {
		err = bpf_map_update_elem(map_fd, &i, &sfd[i], BPF_ANY);
		if (err) {
			printf("Failed map_fd update sockmap %i '%i:%i'\n",
			       err, i, sfd[i]);
			goto out_sockmap;
		}
	}

	/* Test map delete elem and remove send/recv sockets */
	for (i = 2; i < 4; i++) {
		err = bpf_map_delete_elem(map_fd, &i);
		if (err) {
			printf("Failed delete  sockmap %i '%i:%i'\n",
			       err, i, sfd[i]);
			goto out_sockmap;
		}
	}

	/* Test map send/recv */
	sc = send(sfd[2], buf, 10, 0);
	if (sc < 0) {
		printf("Failed sockmap send\n");
		goto out_sockmap;
	}

	FD_ZERO(&w);
	FD_SET(sfd[3], &w);
	to.tv_sec = 1;
	to.tv_usec = 0;
	s = select(sfd[3] + 1, &w, NULL, NULL, &to);
	if (s == -1) {
		perror("Failed sockmap select()");
		goto out_sockmap;
	} else if (!s) {
		printf("Failed sockmap unexpected timeout\n");
		goto out_sockmap;
	}

	if (!FD_ISSET(sfd[3], &w)) {
		printf("Failed sockmap select/recv\n");
		goto out_sockmap;
	}

	rc = recv(sfd[3], buf, sizeof(buf), 0);
	if (rc < 0) {
		printf("Failed sockmap recv\n");
		goto out_sockmap;
	}

	/* Push fd into same slot */
	i = 2;
	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_NOEXIST);
	if (!err) {
		printf("Failed allowed sockmap dup slot BPF_NOEXIST\n");
		goto out_sockmap;
	}

	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
	if (err) {
		printf("Failed sockmap update new slot BPF_ANY\n");
		goto out_sockmap;
	}

	err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_EXIST);
	if (err) {
		printf("Failed sockmap update new slot BPF_EXIST\n");
		goto out_sockmap;
	}

	/* Delete the elems without programs */
	for (i = 0; i < 6; i++) {
		err = bpf_map_delete_elem(fd, &i);
		if (err) {
			printf("Failed delete sockmap %i '%i:%i'\n",
			       err, i, sfd[i]);
		}
	}

	/* Test having multiple maps open and set with programs on same fds */
	err = bpf_prog_attach(parse_prog, fd,
			      BPF_SK_SKB_STREAM_PARSER, 0);
	if (err) {
		printf("Failed fd bpf parse prog attach\n");
		goto out_sockmap;
	}
	err = bpf_prog_attach(verdict_prog, fd,
			      BPF_SK_SKB_STREAM_VERDICT, 0);
	if (err) {
		printf("Failed fd bpf verdict prog attach\n");
		goto out_sockmap;
	}

	for (i = 4; i < 6; i++) {
		err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_ANY);
		if (!err) {
			printf("Failed allowed duplicate programs in update ANY sockmap %i '%i:%i'\n",
			       err, i, sfd[i]);
			goto out_sockmap;
		}
		err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_NOEXIST);
		if (!err) {
			printf("Failed allowed duplicate program in update NOEXIST sockmap  %i '%i:%i'\n",
			       err, i, sfd[i]);
			goto out_sockmap;
		}
		err = bpf_map_update_elem(fd, &i, &sfd[i], BPF_EXIST);
		if (!err) {
			printf("Failed allowed duplicate program in update EXIST sockmap  %i '%i:%i'\n",
			       err, i, sfd[i]);
			goto out_sockmap;
		}
	}

	/* Test map close sockets */
	for (i = 0; i < 6; i++)
		close(sfd[i]);
	close(fd);
	close(map_fd);
	bpf_object__close(obj);
	return;
out:
	for (i = 0; i < 6; i++)
		close(sfd[i]);
	printf("Failed to create sockmap '%i:%s'!\n", i, strerror(errno));
	exit(1);
out_sockmap:
	for (i = 0; i < 6; i++)
		close(sfd[i]);
	close(fd);
	exit(1);
}

#define MAP_SIZE (32 * 1024)

static void test_map_large(void)
{
	struct bigkey {
		int a;
		char b[116];
		long long c;
	} key;
	int fd, i, value;

	fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value),
			    MAP_SIZE, map_flags);
	if (fd < 0) {
		printf("Failed to create large map '%s'!\n", strerror(errno));
		exit(1);
	}

	for (i = 0; i < MAP_SIZE; i++) {
		key = (struct bigkey) { .c = i };
		value = i;

		assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == 0);
	}

	key.c = -1;
	assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == -1 &&
	       errno == E2BIG);

	/* Iterate through all elements. */
	assert(bpf_map_get_next_key(fd, NULL, &key) == 0);
	key.c = -1;
	for (i = 0; i < MAP_SIZE; i++)
		assert(bpf_map_get_next_key(fd, &key, &key) == 0);
	assert(bpf_map_get_next_key(fd, &key, &key) == -1 && errno == ENOENT);

	key.c = 0;
	assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 0);
	key.a = 1;
	assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == ENOENT);

	close(fd);
}

static void run_parallel(int tasks, void (*fn)(int task, void *data),
			 void *data)
{
	pid_t pid[tasks];
	int i;

	for (i = 0; i < tasks; i++) {
		pid[i] = fork();
		if (pid[i] == 0) {
			fn(i, data);
			exit(0);
		} else if (pid[i] == -1) {
			printf("Couldn't spawn #%d process!\n", i);
			exit(1);
		}
	}

	for (i = 0; i < tasks; i++) {
		int status;

		assert(waitpid(pid[i], &status, 0) == pid[i]);
		assert(status == 0);
	}
}

static void test_map_stress(void)
{
	run_parallel(100, test_hashmap, NULL);
	run_parallel(100, test_hashmap_percpu, NULL);
	run_parallel(100, test_hashmap_sizes, NULL);
	run_parallel(100, test_hashmap_walk, NULL);

	run_parallel(100, test_arraymap, NULL);
	run_parallel(100, test_arraymap_percpu, NULL);
}

#define TASKS 1024

#define DO_UPDATE 1
#define DO_DELETE 0

static void do_work(int fn, void *data)
{
	int do_update = ((int *)data)[1];
	int fd = ((int *)data)[0];
	int i, key, value;

	for (i = fn; i < MAP_SIZE; i += TASKS) {
		key = value = i;

		if (do_update) {
			assert(bpf_map_update_elem(fd, &key, &value,
						   BPF_NOEXIST) == 0);
			assert(bpf_map_update_elem(fd, &key, &value,
						   BPF_EXIST) == 0);
		} else {
			assert(bpf_map_delete_elem(fd, &key) == 0);
		}
	}
}

static void test_map_parallel(void)
{
	int i, fd, key = 0, value = 0;
	int data[2];

	fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value),
			    MAP_SIZE, map_flags);
	if (fd < 0) {
		printf("Failed to create map for parallel test '%s'!\n",
		       strerror(errno));
		exit(1);
	}

	/* Use the same fd in children to add elements to this map:
	 * child_0 adds key=0, key=1024, key=2048, ...
	 * child_1 adds key=1, key=1025, key=2049, ...
	 * child_1023 adds key=1023, ...
	 */
	data[0] = fd;
	data[1] = DO_UPDATE;
	run_parallel(TASKS, do_work, data);

	/* Check that key=0 is already there. */
	assert(bpf_map_update_elem(fd, &key, &value, BPF_NOEXIST) == -1 &&
	       errno == EEXIST);

	/* Check that all elements were inserted. */
	assert(bpf_map_get_next_key(fd, NULL, &key) == 0);
	key = -1;
	for (i = 0; i < MAP_SIZE; i++)
		assert(bpf_map_get_next_key(fd, &key, &key) == 0);
	assert(bpf_map_get_next_key(fd, &key, &key) == -1 && errno == ENOENT);

	/* Another check for all elements */
	for (i = 0; i < MAP_SIZE; i++) {
		key = MAP_SIZE - i - 1;

		assert(bpf_map_lookup_elem(fd, &key, &value) == 0 &&
		       value == key);
	}

	/* Now let's delete all elemenets in parallel. */
	data[1] = DO_DELETE;
	run_parallel(TASKS, do_work, data);

	/* Nothing should be left. */
	key = -1;
	assert(bpf_map_get_next_key(fd, NULL, &key) == -1 && errno == ENOENT);
	assert(bpf_map_get_next_key(fd, &key, &key) == -1 && errno == ENOENT);
}

static void run_all_tests(void)
{
	test_hashmap(0, NULL);
	test_hashmap_percpu(0, NULL);
	test_hashmap_walk(0, NULL);

	test_arraymap(0, NULL);
	test_arraymap_percpu(0, NULL);

	test_arraymap_percpu_many_keys();

	test_devmap(0, NULL);
	test_sockmap(0, NULL);

	test_map_large();
	test_map_parallel();
	test_map_stress();
}

int main(void)
{
	struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };

	setrlimit(RLIMIT_MEMLOCK, &rinf);

	map_flags = 0;
	run_all_tests();

	map_flags = BPF_F_NO_PREALLOC;
	run_all_tests();

	printf("test_maps: OK\n");
	return 0;
}