1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include "cgroup_helpers.h"
4
5 #define SOL_CUSTOM 0xdeadbeef
6 #define CUSTOM_INHERIT1 0
7 #define CUSTOM_INHERIT2 1
8 #define CUSTOM_LISTENER 2
9
connect_to_server(int server_fd)10 static int connect_to_server(int server_fd)
11 {
12 struct sockaddr_storage addr;
13 socklen_t len = sizeof(addr);
14 int fd;
15
16 fd = socket(AF_INET, SOCK_STREAM, 0);
17 if (fd < 0) {
18 log_err("Failed to create client socket");
19 return -1;
20 }
21
22 if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
23 log_err("Failed to get server addr");
24 goto out;
25 }
26
27 if (connect(fd, (const struct sockaddr *)&addr, len) < 0) {
28 log_err("Fail to connect to server");
29 goto out;
30 }
31
32 return fd;
33
34 out:
35 close(fd);
36 return -1;
37 }
38
verify_sockopt(int fd,int optname,const char * msg,char expected)39 static int verify_sockopt(int fd, int optname, const char *msg, char expected)
40 {
41 socklen_t optlen = 1;
42 char buf = 0;
43 int err;
44
45 err = getsockopt(fd, SOL_CUSTOM, optname, &buf, &optlen);
46 if (err) {
47 log_err("%s: failed to call getsockopt", msg);
48 return 1;
49 }
50
51 printf("%s %d: got=0x%x ? expected=0x%x\n", msg, optname, buf, expected);
52
53 if (buf != expected) {
54 log_err("%s: unexpected getsockopt value %d != %d", msg,
55 buf, expected);
56 return 1;
57 }
58
59 return 0;
60 }
61
62 static pthread_mutex_t server_started_mtx = PTHREAD_MUTEX_INITIALIZER;
63 static pthread_cond_t server_started = PTHREAD_COND_INITIALIZER;
64
server_thread(void * arg)65 static void *server_thread(void *arg)
66 {
67 struct sockaddr_storage addr;
68 socklen_t len = sizeof(addr);
69 int fd = *(int *)arg;
70 int client_fd;
71 int err = 0;
72
73 err = listen(fd, 1);
74
75 pthread_mutex_lock(&server_started_mtx);
76 pthread_cond_signal(&server_started);
77 pthread_mutex_unlock(&server_started_mtx);
78
79 if (!ASSERT_GE(err, 0, "listed on socket"))
80 return NULL;
81
82 err += verify_sockopt(fd, CUSTOM_INHERIT1, "listen", 1);
83 err += verify_sockopt(fd, CUSTOM_INHERIT2, "listen", 1);
84 err += verify_sockopt(fd, CUSTOM_LISTENER, "listen", 1);
85
86 client_fd = accept(fd, (struct sockaddr *)&addr, &len);
87 if (!ASSERT_GE(client_fd, 0, "accept client"))
88 return NULL;
89
90 err += verify_sockopt(client_fd, CUSTOM_INHERIT1, "accept", 1);
91 err += verify_sockopt(client_fd, CUSTOM_INHERIT2, "accept", 1);
92 err += verify_sockopt(client_fd, CUSTOM_LISTENER, "accept", 0);
93
94 close(client_fd);
95
96 return (void *)(long)err;
97 }
98
start_server(void)99 static int start_server(void)
100 {
101 struct sockaddr_in addr = {
102 .sin_family = AF_INET,
103 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
104 };
105 char buf;
106 int err;
107 int fd;
108 int i;
109
110 fd = socket(AF_INET, SOCK_STREAM, 0);
111 if (fd < 0) {
112 log_err("Failed to create server socket");
113 return -1;
114 }
115
116 for (i = CUSTOM_INHERIT1; i <= CUSTOM_LISTENER; i++) {
117 buf = 0x01;
118 err = setsockopt(fd, SOL_CUSTOM, i, &buf, 1);
119 if (err) {
120 log_err("Failed to call setsockopt(%d)", i);
121 close(fd);
122 return -1;
123 }
124 }
125
126 if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
127 log_err("Failed to bind socket");
128 close(fd);
129 return -1;
130 }
131
132 return fd;
133 }
134
prog_attach(struct bpf_object * obj,int cgroup_fd,const char * title,const char * prog_name)135 static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title,
136 const char *prog_name)
137 {
138 enum bpf_attach_type attach_type;
139 enum bpf_prog_type prog_type;
140 struct bpf_program *prog;
141 int err;
142
143 err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
144 if (err) {
145 log_err("Failed to deduct types for %s BPF program", prog_name);
146 return -1;
147 }
148
149 prog = bpf_object__find_program_by_name(obj, prog_name);
150 if (!prog) {
151 log_err("Failed to find %s BPF program", prog_name);
152 return -1;
153 }
154
155 err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
156 attach_type, 0);
157 if (err) {
158 log_err("Failed to attach %s BPF program", prog_name);
159 return -1;
160 }
161
162 return 0;
163 }
164
run_test(int cgroup_fd)165 static void run_test(int cgroup_fd)
166 {
167 int server_fd = -1, client_fd;
168 struct bpf_object *obj;
169 void *server_err;
170 pthread_t tid;
171 int err;
172
173 obj = bpf_object__open_file("sockopt_inherit.bpf.o", NULL);
174 if (!ASSERT_OK_PTR(obj, "obj_open"))
175 return;
176
177 err = bpf_object__load(obj);
178 if (!ASSERT_OK(err, "obj_load"))
179 goto close_bpf_object;
180
181 err = prog_attach(obj, cgroup_fd, "cgroup/getsockopt", "_getsockopt");
182 if (!ASSERT_OK(err, "prog_attach _getsockopt"))
183 goto close_bpf_object;
184
185 err = prog_attach(obj, cgroup_fd, "cgroup/setsockopt", "_setsockopt");
186 if (!ASSERT_OK(err, "prog_attach _setsockopt"))
187 goto close_bpf_object;
188
189 server_fd = start_server();
190 if (!ASSERT_GE(server_fd, 0, "start_server"))
191 goto close_bpf_object;
192
193 pthread_mutex_lock(&server_started_mtx);
194 if (!ASSERT_OK(pthread_create(&tid, NULL, server_thread,
195 (void *)&server_fd), "pthread_create")) {
196 pthread_mutex_unlock(&server_started_mtx);
197 goto close_server_fd;
198 }
199 pthread_cond_wait(&server_started, &server_started_mtx);
200 pthread_mutex_unlock(&server_started_mtx);
201
202 client_fd = connect_to_server(server_fd);
203 if (!ASSERT_GE(client_fd, 0, "connect_to_server"))
204 goto close_server_fd;
205
206 ASSERT_OK(verify_sockopt(client_fd, CUSTOM_INHERIT1, "connect", 0), "verify_sockopt1");
207 ASSERT_OK(verify_sockopt(client_fd, CUSTOM_INHERIT2, "connect", 0), "verify_sockopt2");
208 ASSERT_OK(verify_sockopt(client_fd, CUSTOM_LISTENER, "connect", 0), "verify_sockopt ener");
209
210 pthread_join(tid, &server_err);
211
212 err = (int)(long)server_err;
213 ASSERT_OK(err, "pthread_join retval");
214
215 close(client_fd);
216
217 close_server_fd:
218 close(server_fd);
219 close_bpf_object:
220 bpf_object__close(obj);
221 }
222
test_sockopt_inherit(void)223 void test_sockopt_inherit(void)
224 {
225 int cgroup_fd;
226
227 cgroup_fd = test__join_cgroup("/sockopt_inherit");
228 if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup"))
229 return;
230
231 run_test(cgroup_fd);
232 close(cgroup_fd);
233 }
234