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/libbpf.h>
15
16 static int map_fd[7];
17
18 #define PORT_A (map_fd[0])
19 #define PORT_H (map_fd[1])
20 #define REG_RESULT_H (map_fd[2])
21 #define INLINE_RESULT_H (map_fd[3])
22 #define A_OF_PORT_A (map_fd[4]) /* Test case #0 */
23 #define H_OF_PORT_A (map_fd[5]) /* Test case #1 */
24 #define H_OF_PORT_H (map_fd[6]) /* Test case #2 */
25
26 static const char * const test_names[] = {
27 "Array of Array",
28 "Hash of Array",
29 "Hash of Hash",
30 };
31
32 #define NR_TESTS (sizeof(test_names) / sizeof(*test_names))
33
check_map_id(int inner_map_fd,int map_in_map_fd,uint32_t key)34 static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
35 {
36 struct bpf_map_info info = {};
37 uint32_t info_len = sizeof(info);
38 int ret, id;
39
40 ret = bpf_obj_get_info_by_fd(inner_map_fd, &info, &info_len);
41 assert(!ret);
42
43 ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
44 assert(!ret);
45 assert(id == info.id);
46 }
47
populate_map(uint32_t port_key,int magic_result)48 static void populate_map(uint32_t port_key, int magic_result)
49 {
50 int ret;
51
52 ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
53 assert(!ret);
54
55 ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
56 BPF_NOEXIST);
57 assert(!ret);
58
59 ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
60 assert(!ret);
61 check_map_id(PORT_A, A_OF_PORT_A, port_key);
62
63 ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
64 assert(!ret);
65 check_map_id(PORT_A, H_OF_PORT_A, port_key);
66
67 ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
68 assert(!ret);
69 check_map_id(PORT_H, H_OF_PORT_H, port_key);
70 }
71
test_map_in_map(void)72 static void test_map_in_map(void)
73 {
74 struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
75 uint32_t result_key = 0, port_key;
76 int result, inline_result;
77 int magic_result = 0xfaceb00c;
78 int ret;
79 int i;
80
81 port_key = rand() & 0x00FF;
82 populate_map(port_key, magic_result);
83
84 in6.sin6_addr.s6_addr16[0] = 0xdead;
85 in6.sin6_addr.s6_addr16[1] = 0xbeef;
86 in6.sin6_port = port_key;
87
88 for (i = 0; i < NR_TESTS; i++) {
89 printf("%s: ", test_names[i]);
90
91 in6.sin6_addr.s6_addr16[7] = i;
92 ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
93 assert(ret == -1 && errno == EBADF);
94
95 ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
96 assert(!ret);
97
98 ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
99 &inline_result);
100 assert(!ret);
101
102 if (result != magic_result || inline_result != magic_result) {
103 printf("Error. result:%d inline_result:%d\n",
104 result, inline_result);
105 exit(1);
106 }
107
108 bpf_map_delete_elem(REG_RESULT_H, &result_key);
109 bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
110
111 printf("Pass\n");
112 }
113 }
114
main(int argc,char ** argv)115 int main(int argc, char **argv)
116 {
117 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
118 struct bpf_link *link = NULL;
119 struct bpf_program *prog;
120 struct bpf_object *obj;
121 char filename[256];
122
123 if (setrlimit(RLIMIT_MEMLOCK, &r)) {
124 perror("setrlimit(RLIMIT_MEMLOCK)");
125 return 1;
126 }
127
128 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
129 obj = bpf_object__open_file(filename, NULL);
130 if (libbpf_get_error(obj)) {
131 fprintf(stderr, "ERROR: opening BPF object file failed\n");
132 return 0;
133 }
134
135 prog = bpf_object__find_program_by_name(obj, "trace_sys_connect");
136 if (!prog) {
137 printf("finding a prog in obj file failed\n");
138 goto cleanup;
139 }
140
141 /* load BPF program */
142 if (bpf_object__load(obj)) {
143 fprintf(stderr, "ERROR: loading BPF object file failed\n");
144 goto cleanup;
145 }
146
147 map_fd[0] = bpf_object__find_map_fd_by_name(obj, "port_a");
148 map_fd[1] = bpf_object__find_map_fd_by_name(obj, "port_h");
149 map_fd[2] = bpf_object__find_map_fd_by_name(obj, "reg_result_h");
150 map_fd[3] = bpf_object__find_map_fd_by_name(obj, "inline_result_h");
151 map_fd[4] = bpf_object__find_map_fd_by_name(obj, "a_of_port_a");
152 map_fd[5] = bpf_object__find_map_fd_by_name(obj, "h_of_port_a");
153 map_fd[6] = bpf_object__find_map_fd_by_name(obj, "h_of_port_h");
154 if (map_fd[0] < 0 || map_fd[1] < 0 || map_fd[2] < 0 ||
155 map_fd[3] < 0 || map_fd[4] < 0 || map_fd[5] < 0 || map_fd[6] < 0) {
156 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
157 goto cleanup;
158 }
159
160 link = bpf_program__attach(prog);
161 if (libbpf_get_error(link)) {
162 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
163 link = NULL;
164 goto cleanup;
165 }
166
167 test_map_in_map();
168
169 cleanup:
170 bpf_link__destroy(link);
171 bpf_object__close(obj);
172 return 0;
173 }
174
