GNU Linux-libre 6.6.15-gnu
[releases.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/socket.h>
6 #include <arpa/inet.h>
7 #include <stdint.h>
8 #include <assert.h>
9 #include <errno.h>
10 #include <stdlib.h>
11 #include <stdio.h>
12 #include <bpf/bpf.h>
13 #include <bpf/libbpf.h>
14
15 #include "bpf_util.h"
16
17 static int map_fd[7];
18
19 #define PORT_A          (map_fd[0])
20 #define PORT_H          (map_fd[1])
21 #define REG_RESULT_H    (map_fd[2])
22 #define INLINE_RESULT_H (map_fd[3])
23 #define A_OF_PORT_A     (map_fd[4]) /* Test case #0 */
24 #define H_OF_PORT_A     (map_fd[5]) /* Test case #1 */
25 #define H_OF_PORT_H     (map_fd[6]) /* Test case #2 */
26
27 static const char * const test_names[] = {
28         "Array of Array",
29         "Hash of Array",
30         "Hash of Hash",
31 };
32
33 #define NR_TESTS ARRAY_SIZE(test_names)
34
35 static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
36 {
37         struct bpf_map_info info = {};
38         uint32_t info_len = sizeof(info);
39         int ret, id;
40
41         ret = bpf_map_get_info_by_fd(inner_map_fd, &info, &info_len);
42         assert(!ret);
43
44         ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
45         assert(!ret);
46         assert(id == info.id);
47 }
48
49 static void populate_map(uint32_t port_key, int magic_result)
50 {
51         int ret;
52
53         ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
54         assert(!ret);
55
56         ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
57                                   BPF_NOEXIST);
58         assert(!ret);
59
60         ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
61         assert(!ret);
62         check_map_id(PORT_A, A_OF_PORT_A, port_key);
63
64         ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
65         assert(!ret);
66         check_map_id(PORT_A, H_OF_PORT_A, port_key);
67
68         ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
69         assert(!ret);
70         check_map_id(PORT_H, H_OF_PORT_H, port_key);
71 }
72
73 static void test_map_in_map(void)
74 {
75         struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
76         uint32_t result_key = 0, port_key;
77         int result, inline_result;
78         int magic_result = 0xfaceb00c;
79         int ret;
80         int i;
81
82         port_key = rand() & 0x00FF;
83         populate_map(port_key, magic_result);
84
85         in6.sin6_addr.s6_addr16[0] = 0xdead;
86         in6.sin6_addr.s6_addr16[1] = 0xbeef;
87         in6.sin6_port = port_key;
88
89         for (i = 0; i < NR_TESTS; i++) {
90                 printf("%s: ", test_names[i]);
91
92                 in6.sin6_addr.s6_addr16[7] = i;
93                 ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
94                 assert(ret == -1 && errno == EBADF);
95
96                 ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
97                 assert(!ret);
98
99                 ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
100                                           &inline_result);
101                 assert(!ret);
102
103                 if (result != magic_result || inline_result != magic_result) {
104                         printf("Error. result:%d inline_result:%d\n",
105                                result, inline_result);
106                         exit(1);
107                 }
108
109                 bpf_map_delete_elem(REG_RESULT_H, &result_key);
110                 bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
111
112                 printf("Pass\n");
113         }
114 }
115
116 int main(int argc, char **argv)
117 {
118         struct bpf_link *link = NULL;
119         struct bpf_program *prog;
120         struct bpf_object *obj;
121         char filename[256];
122
123         snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
124         obj = bpf_object__open_file(filename, NULL);
125         if (libbpf_get_error(obj)) {
126                 fprintf(stderr, "ERROR: opening BPF object file failed\n");
127                 return 0;
128         }
129
130         prog = bpf_object__find_program_by_name(obj, "trace_sys_connect");
131         if (!prog) {
132                 printf("finding a prog in obj file failed\n");
133                 goto cleanup;
134         }
135
136         /* load BPF program */
137         if (bpf_object__load(obj)) {
138                 fprintf(stderr, "ERROR: loading BPF object file failed\n");
139                 goto cleanup;
140         }
141
142         map_fd[0] = bpf_object__find_map_fd_by_name(obj, "port_a");
143         map_fd[1] = bpf_object__find_map_fd_by_name(obj, "port_h");
144         map_fd[2] = bpf_object__find_map_fd_by_name(obj, "reg_result_h");
145         map_fd[3] = bpf_object__find_map_fd_by_name(obj, "inline_result_h");
146         map_fd[4] = bpf_object__find_map_fd_by_name(obj, "a_of_port_a");
147         map_fd[5] = bpf_object__find_map_fd_by_name(obj, "h_of_port_a");
148         map_fd[6] = bpf_object__find_map_fd_by_name(obj, "h_of_port_h");
149         if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0 ||
150             map_fd[3] < 0 || map_fd[4] < 0 || map_fd[5] < 0 || map_fd[6] < 0) {
151                 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
152                 goto cleanup;
153         }
154
155         link = bpf_program__attach(prog);
156         if (libbpf_get_error(link)) {
157                 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
158                 link = NULL;
159                 goto cleanup;
160         }
161
162         test_map_in_map();
163
164 cleanup:
165         bpf_link__destroy(link);
166         bpf_object__close(obj);
167         return 0;
168 }