treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
[muen/linux.git] / samples / bpf / test_map_in_map_user.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2017 Facebook
4  */
5 #include <sys/resource.h>
6 #include <sys/socket.h>
7 #include <arpa/inet.h>
8 #include <stdint.h>
9 #include <assert.h>
10 #include <errno.h>
11 #include <stdlib.h>
12 #include <stdio.h>
13 #include <bpf/bpf.h>
14 #include "bpf_load.h"
15
16 #define PORT_A          (map_fd[0])
17 #define PORT_H          (map_fd[1])
18 #define REG_RESULT_H    (map_fd[2])
19 #define INLINE_RESULT_H (map_fd[3])
20 #define A_OF_PORT_A     (map_fd[4]) /* Test case #0 */
21 #define H_OF_PORT_A     (map_fd[5]) /* Test case #1 */
22 #define H_OF_PORT_H     (map_fd[6]) /* Test case #2 */
23
24 static const char * const test_names[] = {
25         "Array of Array",
26         "Hash of Array",
27         "Hash of Hash",
28 };
29
30 #define NR_TESTS (sizeof(test_names) / sizeof(*test_names))
31
32 static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
33 {
34         struct bpf_map_info info = {};
35         uint32_t info_len = sizeof(info);
36         int ret, id;
37
38         ret = bpf_obj_get_info_by_fd(inner_map_fd, &info, &info_len);
39         assert(!ret);
40
41         ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
42         assert(!ret);
43         assert(id == info.id);
44 }
45
46 static void populate_map(uint32_t port_key, int magic_result)
47 {
48         int ret;
49
50         ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
51         assert(!ret);
52
53         ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
54                                   BPF_NOEXIST);
55         assert(!ret);
56
57         ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
58         assert(!ret);
59         check_map_id(PORT_A, A_OF_PORT_A, port_key);
60
61         ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
62         assert(!ret);
63         check_map_id(PORT_A, H_OF_PORT_A, port_key);
64
65         ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
66         assert(!ret);
67         check_map_id(PORT_H, H_OF_PORT_H, port_key);
68 }
69
70 static void test_map_in_map(void)
71 {
72         struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
73         uint32_t result_key = 0, port_key;
74         int result, inline_result;
75         int magic_result = 0xfaceb00c;
76         int ret;
77         int i;
78
79         port_key = rand() & 0x00FF;
80         populate_map(port_key, magic_result);
81
82         in6.sin6_addr.s6_addr16[0] = 0xdead;
83         in6.sin6_addr.s6_addr16[1] = 0xbeef;
84         in6.sin6_port = port_key;
85
86         for (i = 0; i < NR_TESTS; i++) {
87                 printf("%s: ", test_names[i]);
88
89                 in6.sin6_addr.s6_addr16[7] = i;
90                 ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
91                 assert(ret == -1 && errno == EBADF);
92
93                 ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
94                 assert(!ret);
95
96                 ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
97                                           &inline_result);
98                 assert(!ret);
99
100                 if (result != magic_result || inline_result != magic_result) {
101                         printf("Error. result:%d inline_result:%d\n",
102                                result, inline_result);
103                         exit(1);
104                 }
105
106                 bpf_map_delete_elem(REG_RESULT_H, &result_key);
107                 bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
108
109                 printf("Pass\n");
110         }
111 }
112
113 int main(int argc, char **argv)
114 {
115         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
116         char filename[256];
117
118         assert(!setrlimit(RLIMIT_MEMLOCK, &r));
119
120         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
121
122         if (load_bpf_file(filename)) {
123                 printf("%s", bpf_log_buf);
124                 return 1;
125         }
126
127         test_map_in_map();
128
129         return 0;
130 }