1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2017 Facebook
5 #include <sys/socket.h>
13 #include <bpf/libbpf.h>
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 */
27 static const char * const test_names[] = {
33 #define NR_TESTS ARRAY_SIZE(test_names)
35 static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
37 struct bpf_map_info info = {};
38 uint32_t info_len = sizeof(info);
41 ret = bpf_map_get_info_by_fd(inner_map_fd, &info, &info_len);
44 ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
46 assert(id == info.id);
49 static void populate_map(uint32_t port_key, int magic_result)
53 ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
56 ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
60 ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
62 check_map_id(PORT_A, A_OF_PORT_A, port_key);
64 ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
66 check_map_id(PORT_A, H_OF_PORT_A, port_key);
68 ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
70 check_map_id(PORT_H, H_OF_PORT_H, port_key);
73 static void test_map_in_map(void)
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;
82 port_key = rand() & 0x00FF;
83 populate_map(port_key, magic_result);
85 in6.sin6_addr.s6_addr16[0] = 0xdead;
86 in6.sin6_addr.s6_addr16[1] = 0xbeef;
87 in6.sin6_port = port_key;
89 for (i = 0; i < NR_TESTS; i++) {
90 printf("%s: ", test_names[i]);
92 in6.sin6_addr.s6_addr16[7] = i;
93 ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
94 assert(ret == -1 && errno == EBADF);
96 ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
99 ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
103 if (result != magic_result || inline_result != magic_result) {
104 printf("Error. result:%d inline_result:%d\n",
105 result, inline_result);
109 bpf_map_delete_elem(REG_RESULT_H, &result_key);
110 bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
116 int main(int argc, char **argv)
118 struct bpf_link *link = NULL;
119 struct bpf_program *prog;
120 struct bpf_object *obj;
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");
130 prog = bpf_object__find_program_by_name(obj, "trace_sys_connect");
132 printf("finding a prog in obj file failed\n");
136 /* load BPF program */
137 if (bpf_object__load(obj)) {
138 fprintf(stderr, "ERROR: loading BPF object file failed\n");
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");
155 link = bpf_program__attach(prog);
156 if (libbpf_get_error(link)) {
157 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
165 bpf_link__destroy(link);
166 bpf_object__close(obj);