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