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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 | // SPDX-License-Identifier: GPL-2.0 #include <test_progs.h> #include "cgroup_helpers.h" static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title, const char *name) { enum bpf_attach_type attach_type; enum bpf_prog_type prog_type; struct bpf_program *prog; int err; err = libbpf_prog_type_by_name(title, &prog_type, &attach_type); if (err) { log_err("Failed to deduct types for %s BPF program", title); return -1; } prog = bpf_object__find_program_by_name(obj, name); if (!prog) { log_err("Failed to find %s BPF program", name); return -1; } err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd, attach_type, BPF_F_ALLOW_MULTI); if (err) { log_err("Failed to attach %s BPF program", name); return -1; } return 0; } static int prog_detach(struct bpf_object *obj, int cgroup_fd, const char *title, const char *name) { enum bpf_attach_type attach_type; enum bpf_prog_type prog_type; struct bpf_program *prog; int err; err = libbpf_prog_type_by_name(title, &prog_type, &attach_type); if (err) return -1; prog = bpf_object__find_program_by_name(obj, name); if (!prog) return -1; err = bpf_prog_detach2(bpf_program__fd(prog), cgroup_fd, attach_type); if (err) return -1; return 0; } static int run_getsockopt_test(struct bpf_object *obj, int cg_parent, int cg_child, int sock_fd) { socklen_t optlen; __u8 buf; int err; /* Set IP_TOS to the expected value (0x80). */ buf = 0x80; err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1); if (err < 0) { log_err("Failed to call setsockopt(IP_TOS)"); goto detach; } buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (err) { log_err("Failed to call getsockopt(IP_TOS)"); goto detach; } if (buf != 0x80) { log_err("Unexpected getsockopt 0x%x != 0x80 without BPF", buf); err = -1; goto detach; } /* Attach child program and make sure it returns new value: * - kernel: -> 0x80 * - child: 0x80 -> 0x90 */ err = prog_attach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child"); if (err) goto detach; buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (err) { log_err("Failed to call getsockopt(IP_TOS)"); goto detach; } if (buf != 0x90) { log_err("Unexpected getsockopt 0x%x != 0x90", buf); err = -1; goto detach; } /* Attach parent program and make sure it returns new value: * - kernel: -> 0x80 * - child: 0x80 -> 0x90 * - parent: 0x90 -> 0xA0 */ err = prog_attach(obj, cg_parent, "cgroup/getsockopt", "_getsockopt_parent"); if (err) goto detach; buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (err) { log_err("Failed to call getsockopt(IP_TOS)"); goto detach; } if (buf != 0xA0) { log_err("Unexpected getsockopt 0x%x != 0xA0", buf); err = -1; goto detach; } /* Setting unexpected initial sockopt should return EPERM: * - kernel: -> 0x40 * - child: unexpected 0x40, EPERM * - parent: unexpected 0x40, EPERM */ buf = 0x40; err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1); if (err < 0) { log_err("Failed to call setsockopt(IP_TOS)"); goto detach; } buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (!err) { log_err("Unexpected success from getsockopt(IP_TOS)"); goto detach; } /* Detach child program and make sure we still get EPERM: * - kernel: -> 0x40 * - parent: unexpected 0x40, EPERM */ err = prog_detach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child"); if (err) { log_err("Failed to detach child program"); goto detach; } buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (!err) { log_err("Unexpected success from getsockopt(IP_TOS)"); goto detach; } /* Set initial value to the one the parent program expects: * - kernel: -> 0x90 * - parent: 0x90 -> 0xA0 */ buf = 0x90; err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1); if (err < 0) { log_err("Failed to call setsockopt(IP_TOS)"); goto detach; } buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (err) { log_err("Failed to call getsockopt(IP_TOS)"); goto detach; } if (buf != 0xA0) { log_err("Unexpected getsockopt 0x%x != 0xA0", buf); err = -1; goto detach; } detach: prog_detach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child"); prog_detach(obj, cg_parent, "cgroup/getsockopt", "_getsockopt_parent"); return err; } static int run_setsockopt_test(struct bpf_object *obj, int cg_parent, int cg_child, int sock_fd) { socklen_t optlen; __u8 buf; int err; /* Set IP_TOS to the expected value (0x80). */ buf = 0x80; err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1); if (err < 0) { log_err("Failed to call setsockopt(IP_TOS)"); goto detach; } buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (err) { log_err("Failed to call getsockopt(IP_TOS)"); goto detach; } if (buf != 0x80) { log_err("Unexpected getsockopt 0x%x != 0x80 without BPF", buf); err = -1; goto detach; } /* Attach child program and make sure it adds 0x10. */ err = prog_attach(obj, cg_child, "cgroup/setsockopt", "_setsockopt"); if (err) goto detach; buf = 0x80; err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1); if (err < 0) { log_err("Failed to call setsockopt(IP_TOS)"); goto detach; } buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (err) { log_err("Failed to call getsockopt(IP_TOS)"); goto detach; } if (buf != 0x80 + 0x10) { log_err("Unexpected getsockopt 0x%x != 0x80 + 0x10", buf); err = -1; goto detach; } /* Attach parent program and make sure it adds another 0x10. */ err = prog_attach(obj, cg_parent, "cgroup/setsockopt", "_setsockopt"); if (err) goto detach; buf = 0x80; err = setsockopt(sock_fd, SOL_IP, IP_TOS, &buf, 1); if (err < 0) { log_err("Failed to call setsockopt(IP_TOS)"); goto detach; } buf = 0x00; optlen = 1; err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen); if (err) { log_err("Failed to call getsockopt(IP_TOS)"); goto detach; } if (buf != 0x80 + 2 * 0x10) { log_err("Unexpected getsockopt 0x%x != 0x80 + 2 * 0x10", buf); err = -1; goto detach; } detach: prog_detach(obj, cg_child, "cgroup/setsockopt", "_setsockopt"); prog_detach(obj, cg_parent, "cgroup/setsockopt", "_setsockopt"); return err; } void test_sockopt_multi(void) { int cg_parent = -1, cg_child = -1; struct bpf_object *obj = NULL; int sock_fd = -1; int err = -1; cg_parent = test__join_cgroup("/parent"); if (!ASSERT_GE(cg_parent, 0, "join_cgroup /parent")) goto out; cg_child = test__join_cgroup("/parent/child"); if (!ASSERT_GE(cg_child, 0, "join_cgroup /parent/child")) goto out; obj = bpf_object__open_file("sockopt_multi.bpf.o", NULL); if (!ASSERT_OK_PTR(obj, "obj_load")) goto out; err = bpf_object__load(obj); if (!ASSERT_OK(err, "obj_load")) goto out; sock_fd = socket(AF_INET, SOCK_STREAM, 0); if (!ASSERT_GE(sock_fd, 0, "socket")) goto out; ASSERT_OK(run_getsockopt_test(obj, cg_parent, cg_child, sock_fd), "getsockopt_test"); ASSERT_OK(run_setsockopt_test(obj, cg_parent, cg_child, sock_fd), "setsockopt_test"); out: close(sock_fd); bpf_object__close(obj); close(cg_child); close(cg_parent); } |