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