1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2019 Facebook */ 3 #include <test_progs.h> 4 #include <network_helpers.h> 5 #include <bpf/btf.h> 6 #include "bind4_prog.skel.h" 7 8 typedef int (*test_cb)(struct bpf_object *obj); 9 10 static int check_data_map(struct bpf_object *obj, int prog_cnt, bool reset) 11 { 12 struct bpf_map *data_map = NULL, *map; 13 __u64 *result = NULL; 14 const int zero = 0; 15 __u32 duration = 0; 16 int ret = -1, i; 17 18 result = malloc((prog_cnt + 32 /* spare */) * sizeof(__u64)); 19 if (CHECK(!result, "alloc_memory", "failed to alloc memory")) 20 return -ENOMEM; 21 22 bpf_object__for_each_map(map, obj) 23 if (bpf_map__is_internal(map)) { 24 data_map = map; 25 break; 26 } 27 if (CHECK(!data_map, "find_data_map", "data map not found\n")) 28 goto out; 29 30 ret = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, result); 31 if (CHECK(ret, "get_result", 32 "failed to get output data: %d\n", ret)) 33 goto out; 34 35 for (i = 0; i < prog_cnt; i++) { 36 if (CHECK(result[i] != 1, "result", 37 "fexit_bpf2bpf result[%d] failed err %llu\n", 38 i, result[i])) 39 goto out; 40 result[i] = 0; 41 } 42 if (reset) { 43 ret = bpf_map_update_elem(bpf_map__fd(data_map), &zero, result, 0); 44 if (CHECK(ret, "reset_result", "failed to reset result\n")) 45 goto out; 46 } 47 48 ret = 0; 49 out: 50 free(result); 51 return ret; 52 } 53 54 static void test_fexit_bpf2bpf_common(const char *obj_file, 55 const char *target_obj_file, 56 int prog_cnt, 57 const char **prog_name, 58 bool run_prog, 59 test_cb cb) 60 { 61 struct bpf_object *obj = NULL, *tgt_obj; 62 __u32 tgt_prog_id, info_len; 63 struct bpf_prog_info prog_info = {}; 64 struct bpf_program **prog = NULL, *p; 65 struct bpf_link **link = NULL; 66 int err, tgt_fd, i; 67 struct btf *btf; 68 LIBBPF_OPTS(bpf_test_run_opts, topts, 69 .data_in = &pkt_v6, 70 .data_size_in = sizeof(pkt_v6), 71 .repeat = 1, 72 ); 73 74 err = bpf_prog_test_load(target_obj_file, BPF_PROG_TYPE_UNSPEC, 75 &tgt_obj, &tgt_fd); 76 if (!ASSERT_OK(err, "tgt_prog_load")) 77 return; 78 79 info_len = sizeof(prog_info); 80 err = bpf_obj_get_info_by_fd(tgt_fd, &prog_info, &info_len); 81 if (!ASSERT_OK(err, "tgt_fd_get_info")) 82 goto close_prog; 83 84 tgt_prog_id = prog_info.id; 85 btf = bpf_object__btf(tgt_obj); 86 87 link = calloc(sizeof(struct bpf_link *), prog_cnt); 88 if (!ASSERT_OK_PTR(link, "link_ptr")) 89 goto close_prog; 90 91 prog = calloc(sizeof(struct bpf_program *), prog_cnt); 92 if (!ASSERT_OK_PTR(prog, "prog_ptr")) 93 goto close_prog; 94 95 obj = bpf_object__open_file(obj_file, NULL); 96 if (!ASSERT_OK_PTR(obj, "obj_open")) 97 goto close_prog; 98 99 bpf_object__for_each_program(p, obj) { 100 err = bpf_program__set_attach_target(p, tgt_fd, NULL); 101 ASSERT_OK(err, "set_attach_target"); 102 } 103 104 err = bpf_object__load(obj); 105 if (!ASSERT_OK(err, "obj_load")) 106 goto close_prog; 107 108 for (i = 0; i < prog_cnt; i++) { 109 struct bpf_link_info link_info; 110 struct bpf_program *pos; 111 const char *pos_sec_name; 112 char *tgt_name; 113 __s32 btf_id; 114 115 tgt_name = strstr(prog_name[i], "/"); 116 if (!ASSERT_OK_PTR(tgt_name, "tgt_name")) 117 goto close_prog; 118 btf_id = btf__find_by_name_kind(btf, tgt_name + 1, BTF_KIND_FUNC); 119 120 prog[i] = NULL; 121 bpf_object__for_each_program(pos, obj) { 122 pos_sec_name = bpf_program__section_name(pos); 123 if (pos_sec_name && !strcmp(pos_sec_name, prog_name[i])) { 124 prog[i] = pos; 125 break; 126 } 127 } 128 if (!ASSERT_OK_PTR(prog[i], prog_name[i])) 129 goto close_prog; 130 131 link[i] = bpf_program__attach_trace(prog[i]); 132 if (!ASSERT_OK_PTR(link[i], "attach_trace")) 133 goto close_prog; 134 135 info_len = sizeof(link_info); 136 memset(&link_info, 0, sizeof(link_info)); 137 err = bpf_obj_get_info_by_fd(bpf_link__fd(link[i]), 138 &link_info, &info_len); 139 ASSERT_OK(err, "link_fd_get_info"); 140 ASSERT_EQ(link_info.tracing.attach_type, 141 bpf_program__expected_attach_type(prog[i]), 142 "link_attach_type"); 143 ASSERT_EQ(link_info.tracing.target_obj_id, tgt_prog_id, "link_tgt_obj_id"); 144 ASSERT_EQ(link_info.tracing.target_btf_id, btf_id, "link_tgt_btf_id"); 145 } 146 147 if (cb) { 148 err = cb(obj); 149 if (err) 150 goto close_prog; 151 } 152 153 if (!run_prog) 154 goto close_prog; 155 156 err = bpf_prog_test_run_opts(tgt_fd, &topts); 157 ASSERT_OK(err, "prog_run"); 158 ASSERT_EQ(topts.retval, 0, "prog_run_ret"); 159 160 if (check_data_map(obj, prog_cnt, false)) 161 goto close_prog; 162 163 close_prog: 164 for (i = 0; i < prog_cnt; i++) 165 bpf_link__destroy(link[i]); 166 bpf_object__close(obj); 167 bpf_object__close(tgt_obj); 168 free(link); 169 free(prog); 170 } 171 172 static void test_target_no_callees(void) 173 { 174 const char *prog_name[] = { 175 "fexit/test_pkt_md_access", 176 }; 177 test_fexit_bpf2bpf_common("./fexit_bpf2bpf_simple.o", 178 "./test_pkt_md_access.o", 179 ARRAY_SIZE(prog_name), 180 prog_name, true, NULL); 181 } 182 183 static void test_target_yes_callees(void) 184 { 185 const char *prog_name[] = { 186 "fexit/test_pkt_access", 187 "fexit/test_pkt_access_subprog1", 188 "fexit/test_pkt_access_subprog2", 189 "fexit/test_pkt_access_subprog3", 190 }; 191 test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o", 192 "./test_pkt_access.o", 193 ARRAY_SIZE(prog_name), 194 prog_name, true, NULL); 195 } 196 197 static void test_func_replace(void) 198 { 199 const char *prog_name[] = { 200 "fexit/test_pkt_access", 201 "fexit/test_pkt_access_subprog1", 202 "fexit/test_pkt_access_subprog2", 203 "fexit/test_pkt_access_subprog3", 204 "freplace/get_skb_len", 205 "freplace/get_skb_ifindex", 206 "freplace/get_constant", 207 "freplace/test_pkt_write_access_subprog", 208 }; 209 test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o", 210 "./test_pkt_access.o", 211 ARRAY_SIZE(prog_name), 212 prog_name, true, NULL); 213 } 214 215 static void test_func_replace_verify(void) 216 { 217 const char *prog_name[] = { 218 "freplace/do_bind", 219 }; 220 test_fexit_bpf2bpf_common("./freplace_connect4.o", 221 "./connect4_prog.o", 222 ARRAY_SIZE(prog_name), 223 prog_name, false, NULL); 224 } 225 226 static int test_second_attach(struct bpf_object *obj) 227 { 228 const char *prog_name = "security_new_get_constant"; 229 const char *tgt_name = "get_constant"; 230 const char *tgt_obj_file = "./test_pkt_access.o"; 231 struct bpf_program *prog = NULL; 232 struct bpf_object *tgt_obj; 233 struct bpf_link *link; 234 int err = 0, tgt_fd; 235 LIBBPF_OPTS(bpf_test_run_opts, topts, 236 .data_in = &pkt_v6, 237 .data_size_in = sizeof(pkt_v6), 238 .repeat = 1, 239 ); 240 241 prog = bpf_object__find_program_by_name(obj, prog_name); 242 if (!ASSERT_OK_PTR(prog, "find_prog")) 243 return -ENOENT; 244 245 err = bpf_prog_test_load(tgt_obj_file, BPF_PROG_TYPE_UNSPEC, 246 &tgt_obj, &tgt_fd); 247 if (!ASSERT_OK(err, "second_prog_load")) 248 return err; 249 250 link = bpf_program__attach_freplace(prog, tgt_fd, tgt_name); 251 if (!ASSERT_OK_PTR(link, "second_link")) 252 goto out; 253 254 err = bpf_prog_test_run_opts(tgt_fd, &topts); 255 if (!ASSERT_OK(err, "ipv6 test_run")) 256 goto out; 257 if (!ASSERT_OK(topts.retval, "ipv6 retval")) 258 goto out; 259 260 err = check_data_map(obj, 1, true); 261 if (err) 262 goto out; 263 264 out: 265 bpf_link__destroy(link); 266 bpf_object__close(tgt_obj); 267 return err; 268 } 269 270 static void test_func_replace_multi(void) 271 { 272 const char *prog_name[] = { 273 "freplace/get_constant", 274 }; 275 test_fexit_bpf2bpf_common("./freplace_get_constant.o", 276 "./test_pkt_access.o", 277 ARRAY_SIZE(prog_name), 278 prog_name, true, test_second_attach); 279 } 280 281 static void test_fmod_ret_freplace(void) 282 { 283 struct bpf_object *freplace_obj = NULL, *pkt_obj, *fmod_obj = NULL; 284 const char *freplace_name = "./freplace_get_constant.o"; 285 const char *fmod_ret_name = "./fmod_ret_freplace.o"; 286 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts); 287 const char *tgt_name = "./test_pkt_access.o"; 288 struct bpf_link *freplace_link = NULL; 289 struct bpf_program *prog; 290 __u32 duration = 0; 291 int err, pkt_fd, attach_prog_fd; 292 293 err = bpf_prog_test_load(tgt_name, BPF_PROG_TYPE_UNSPEC, 294 &pkt_obj, &pkt_fd); 295 /* the target prog should load fine */ 296 if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n", 297 tgt_name, err, errno)) 298 return; 299 300 freplace_obj = bpf_object__open_file(freplace_name, NULL); 301 if (!ASSERT_OK_PTR(freplace_obj, "freplace_obj_open")) 302 goto out; 303 304 prog = bpf_object__next_program(freplace_obj, NULL); 305 err = bpf_program__set_attach_target(prog, pkt_fd, NULL); 306 ASSERT_OK(err, "freplace__set_attach_target"); 307 308 err = bpf_object__load(freplace_obj); 309 if (CHECK(err, "freplace_obj_load", "err %d\n", err)) 310 goto out; 311 312 freplace_link = bpf_program__attach_trace(prog); 313 if (!ASSERT_OK_PTR(freplace_link, "freplace_attach_trace")) 314 goto out; 315 316 fmod_obj = bpf_object__open_file(fmod_ret_name, NULL); 317 if (!ASSERT_OK_PTR(fmod_obj, "fmod_obj_open")) 318 goto out; 319 320 attach_prog_fd = bpf_program__fd(prog); 321 prog = bpf_object__next_program(fmod_obj, NULL); 322 err = bpf_program__set_attach_target(prog, attach_prog_fd, NULL); 323 ASSERT_OK(err, "fmod_ret_set_attach_target"); 324 325 err = bpf_object__load(fmod_obj); 326 if (CHECK(!err, "fmod_obj_load", "loading fmod_ret should fail\n")) 327 goto out; 328 329 out: 330 bpf_link__destroy(freplace_link); 331 bpf_object__close(freplace_obj); 332 bpf_object__close(fmod_obj); 333 bpf_object__close(pkt_obj); 334 } 335 336 337 static void test_func_sockmap_update(void) 338 { 339 const char *prog_name[] = { 340 "freplace/cls_redirect", 341 }; 342 test_fexit_bpf2bpf_common("./freplace_cls_redirect.o", 343 "./test_cls_redirect.o", 344 ARRAY_SIZE(prog_name), 345 prog_name, false, NULL); 346 } 347 348 static void test_obj_load_failure_common(const char *obj_file, 349 const char *target_obj_file) 350 { 351 /* 352 * standalone test that asserts failure to load freplace prog 353 * because of invalid return code. 354 */ 355 struct bpf_object *obj = NULL, *pkt_obj; 356 struct bpf_program *prog; 357 int err, pkt_fd; 358 __u32 duration = 0; 359 360 err = bpf_prog_test_load(target_obj_file, BPF_PROG_TYPE_UNSPEC, 361 &pkt_obj, &pkt_fd); 362 /* the target prog should load fine */ 363 if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n", 364 target_obj_file, err, errno)) 365 return; 366 367 obj = bpf_object__open_file(obj_file, NULL); 368 if (!ASSERT_OK_PTR(obj, "obj_open")) 369 goto close_prog; 370 371 prog = bpf_object__next_program(obj, NULL); 372 err = bpf_program__set_attach_target(prog, pkt_fd, NULL); 373 ASSERT_OK(err, "set_attach_target"); 374 375 /* It should fail to load the program */ 376 err = bpf_object__load(obj); 377 if (CHECK(!err, "bpf_obj_load should fail", "err %d\n", err)) 378 goto close_prog; 379 380 close_prog: 381 bpf_object__close(obj); 382 bpf_object__close(pkt_obj); 383 } 384 385 static void test_func_replace_return_code(void) 386 { 387 /* test invalid return code in the replaced program */ 388 test_obj_load_failure_common("./freplace_connect_v4_prog.o", 389 "./connect4_prog.o"); 390 } 391 392 static void test_func_map_prog_compatibility(void) 393 { 394 /* test with spin lock map value in the replaced program */ 395 test_obj_load_failure_common("./freplace_attach_probe.o", 396 "./test_attach_probe.o"); 397 } 398 399 static void test_func_replace_global_func(void) 400 { 401 const char *prog_name[] = { 402 "freplace/test_pkt_access", 403 }; 404 405 test_fexit_bpf2bpf_common("./freplace_global_func.o", 406 "./test_pkt_access.o", 407 ARRAY_SIZE(prog_name), 408 prog_name, false, NULL); 409 } 410 411 static int find_prog_btf_id(const char *name, __u32 attach_prog_fd) 412 { 413 struct bpf_prog_info info = {}; 414 __u32 info_len = sizeof(info); 415 struct btf *btf; 416 int ret; 417 418 ret = bpf_obj_get_info_by_fd(attach_prog_fd, &info, &info_len); 419 if (ret) 420 return ret; 421 422 if (!info.btf_id) 423 return -EINVAL; 424 425 btf = btf__load_from_kernel_by_id(info.btf_id); 426 ret = libbpf_get_error(btf); 427 if (ret) 428 return ret; 429 430 ret = btf__find_by_name_kind(btf, name, BTF_KIND_FUNC); 431 btf__free(btf); 432 return ret; 433 } 434 435 static int load_fentry(int attach_prog_fd, int attach_btf_id) 436 { 437 LIBBPF_OPTS(bpf_prog_load_opts, opts, 438 .expected_attach_type = BPF_TRACE_FENTRY, 439 .attach_prog_fd = attach_prog_fd, 440 .attach_btf_id = attach_btf_id, 441 ); 442 struct bpf_insn insns[] = { 443 BPF_MOV64_IMM(BPF_REG_0, 0), 444 BPF_EXIT_INSN(), 445 }; 446 447 return bpf_prog_load(BPF_PROG_TYPE_TRACING, 448 "bind4_fentry", 449 "GPL", 450 insns, 451 ARRAY_SIZE(insns), 452 &opts); 453 } 454 455 static void test_fentry_to_cgroup_bpf(void) 456 { 457 struct bind4_prog *skel = NULL; 458 struct bpf_prog_info info = {}; 459 __u32 info_len = sizeof(info); 460 int cgroup_fd = -1; 461 int fentry_fd = -1; 462 int btf_id; 463 464 cgroup_fd = test__join_cgroup("/fentry_to_cgroup_bpf"); 465 if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd")) 466 return; 467 468 skel = bind4_prog__open_and_load(); 469 if (!ASSERT_OK_PTR(skel, "skel")) 470 goto cleanup; 471 472 skel->links.bind_v4_prog = bpf_program__attach_cgroup(skel->progs.bind_v4_prog, cgroup_fd); 473 if (!ASSERT_OK_PTR(skel->links.bind_v4_prog, "bpf_program__attach_cgroup")) 474 goto cleanup; 475 476 btf_id = find_prog_btf_id("bind_v4_prog", bpf_program__fd(skel->progs.bind_v4_prog)); 477 if (!ASSERT_GE(btf_id, 0, "find_prog_btf_id")) 478 goto cleanup; 479 480 fentry_fd = load_fentry(bpf_program__fd(skel->progs.bind_v4_prog), btf_id); 481 if (!ASSERT_GE(fentry_fd, 0, "load_fentry")) 482 goto cleanup; 483 484 /* Make sure bpf_obj_get_info_by_fd works correctly when attaching 485 * to another BPF program. 486 */ 487 488 ASSERT_OK(bpf_obj_get_info_by_fd(fentry_fd, &info, &info_len), 489 "bpf_obj_get_info_by_fd"); 490 491 ASSERT_EQ(info.btf_id, 0, "info.btf_id"); 492 ASSERT_EQ(info.attach_btf_id, btf_id, "info.attach_btf_id"); 493 ASSERT_GT(info.attach_btf_obj_id, 0, "info.attach_btf_obj_id"); 494 495 cleanup: 496 if (cgroup_fd >= 0) 497 close(cgroup_fd); 498 if (fentry_fd >= 0) 499 close(fentry_fd); 500 bind4_prog__destroy(skel); 501 } 502 503 /* NOTE: affect other tests, must run in serial mode */ 504 void serial_test_fexit_bpf2bpf(void) 505 { 506 if (test__start_subtest("target_no_callees")) 507 test_target_no_callees(); 508 if (test__start_subtest("target_yes_callees")) 509 test_target_yes_callees(); 510 if (test__start_subtest("func_replace")) 511 test_func_replace(); 512 if (test__start_subtest("func_replace_verify")) 513 test_func_replace_verify(); 514 if (test__start_subtest("func_sockmap_update")) 515 test_func_sockmap_update(); 516 if (test__start_subtest("func_replace_return_code")) 517 test_func_replace_return_code(); 518 if (test__start_subtest("func_map_prog_compatibility")) 519 test_func_map_prog_compatibility(); 520 if (test__start_subtest("func_replace_multi")) 521 test_func_replace_multi(); 522 if (test__start_subtest("fmod_ret_freplace")) 523 test_fmod_ret_freplace(); 524 if (test__start_subtest("func_replace_global_func")) 525 test_func_replace_global_func(); 526 if (test__start_subtest("fentry_to_cgroup_bpf")) 527 test_fentry_to_cgroup_bpf(); 528 } 529