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-rw-r--r--samples/bpf/test_map_in_map_user.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/samples/bpf/test_map_in_map_user.c b/samples/bpf/test_map_in_map_user.c
new file mode 100644
index 0000000000..55dca43f37
--- /dev/null
+++ b/samples/bpf/test_map_in_map_user.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017 Facebook
+ */
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <stdint.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#include "bpf_util.h"
+
+static int map_fd[7];
+
+#define PORT_A (map_fd[0])
+#define PORT_H (map_fd[1])
+#define REG_RESULT_H (map_fd[2])
+#define INLINE_RESULT_H (map_fd[3])
+#define A_OF_PORT_A (map_fd[4]) /* Test case #0 */
+#define H_OF_PORT_A (map_fd[5]) /* Test case #1 */
+#define H_OF_PORT_H (map_fd[6]) /* Test case #2 */
+
+static const char * const test_names[] = {
+ "Array of Array",
+ "Hash of Array",
+ "Hash of Hash",
+};
+
+#define NR_TESTS ARRAY_SIZE(test_names)
+
+static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
+{
+ struct bpf_map_info info = {};
+ uint32_t info_len = sizeof(info);
+ int ret, id;
+
+ ret = bpf_map_get_info_by_fd(inner_map_fd, &info, &info_len);
+ assert(!ret);
+
+ ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
+ assert(!ret);
+ assert(id == info.id);
+}
+
+static void populate_map(uint32_t port_key, int magic_result)
+{
+ int ret;
+
+ ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
+ assert(!ret);
+
+ ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
+ BPF_NOEXIST);
+ assert(!ret);
+
+ ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
+ assert(!ret);
+ check_map_id(PORT_A, A_OF_PORT_A, port_key);
+
+ ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
+ assert(!ret);
+ check_map_id(PORT_A, H_OF_PORT_A, port_key);
+
+ ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
+ assert(!ret);
+ check_map_id(PORT_H, H_OF_PORT_H, port_key);
+}
+
+static void test_map_in_map(void)
+{
+ struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
+ uint32_t result_key = 0, port_key;
+ int result, inline_result;
+ int magic_result = 0xfaceb00c;
+ int ret;
+ int i;
+
+ port_key = rand() & 0x00FF;
+ populate_map(port_key, magic_result);
+
+ in6.sin6_addr.s6_addr16[0] = 0xdead;
+ in6.sin6_addr.s6_addr16[1] = 0xbeef;
+ in6.sin6_port = port_key;
+
+ for (i = 0; i < NR_TESTS; i++) {
+ printf("%s: ", test_names[i]);
+
+ in6.sin6_addr.s6_addr16[7] = i;
+ ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
+ assert(ret == -1 && errno == EBADF);
+
+ ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
+ assert(!ret);
+
+ ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
+ &inline_result);
+ assert(!ret);
+
+ if (result != magic_result || inline_result != magic_result) {
+ printf("Error. result:%d inline_result:%d\n",
+ result, inline_result);
+ exit(1);
+ }
+
+ bpf_map_delete_elem(REG_RESULT_H, &result_key);
+ bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
+
+ printf("Pass\n");
+ }
+}
+
+int main(int argc, char **argv)
+{
+ struct bpf_link *link = NULL;
+ struct bpf_program *prog;
+ struct bpf_object *obj;
+ char filename[256];
+
+ snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
+ obj = bpf_object__open_file(filename, NULL);
+ if (libbpf_get_error(obj)) {
+ fprintf(stderr, "ERROR: opening BPF object file failed\n");
+ return 0;
+ }
+
+ prog = bpf_object__find_program_by_name(obj, "trace_sys_connect");
+ if (!prog) {
+ printf("finding a prog in obj file failed\n");
+ goto cleanup;
+ }
+
+ /* load BPF program */
+ if (bpf_object__load(obj)) {
+ fprintf(stderr, "ERROR: loading BPF object file failed\n");
+ goto cleanup;
+ }
+
+ map_fd[0] = bpf_object__find_map_fd_by_name(obj, "port_a");
+ map_fd[1] = bpf_object__find_map_fd_by_name(obj, "port_h");
+ map_fd[2] = bpf_object__find_map_fd_by_name(obj, "reg_result_h");
+ map_fd[3] = bpf_object__find_map_fd_by_name(obj, "inline_result_h");
+ map_fd[4] = bpf_object__find_map_fd_by_name(obj, "a_of_port_a");
+ map_fd[5] = bpf_object__find_map_fd_by_name(obj, "h_of_port_a");
+ map_fd[6] = bpf_object__find_map_fd_by_name(obj, "h_of_port_h");
+ if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0 ||
+ map_fd[3] < 0 || map_fd[4] < 0 || map_fd[5] < 0 || map_fd[6] < 0) {
+ fprintf(stderr, "ERROR: finding a map in obj file failed\n");
+ goto cleanup;
+ }
+
+ link = bpf_program__attach(prog);
+ if (libbpf_get_error(link)) {
+ fprintf(stderr, "ERROR: bpf_program__attach failed\n");
+ link = NULL;
+ goto cleanup;
+ }
+
+ test_map_in_map();
+
+cleanup:
+ bpf_link__destroy(link);
+ bpf_object__close(obj);
+ return 0;
+}