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 7 typedef int (*test_cb)(struct bpf_object *obj); 8 9 static int check_data_map(struct bpf_object *obj, int prog_cnt, bool reset) 10 { 11 struct bpf_map *data_map = NULL, *map; 12 __u64 *result = NULL; 13 const int zero = 0; 14 __u32 duration = 0; 15 int ret = -1, i; 16 17 result = malloc((prog_cnt + 32 /* spare */) * sizeof(__u64)); 18 if (CHECK(!result, "alloc_memory", "failed to alloc memory")) 19 return -ENOMEM; 20 21 bpf_object__for_each_map(map, obj) 22 if (bpf_map__is_internal(map)) { 23 data_map = map; 24 break; 25 } 26 if (CHECK(!data_map, "find_data_map", "data map not found\n")) 27 goto out; 28 29 ret = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, result); 30 if (CHECK(ret, "get_result", 31 "failed to get output data: %d\n", ret)) 32 goto out; 33 34 for (i = 0; i < prog_cnt; i++) { 35 if (CHECK(result[i] != 1, "result", 36 "fexit_bpf2bpf result[%d] failed err %llu\n", 37 i, result[i])) 38 goto out; 39 result[i] = 0; 40 } 41 if (reset) { 42 ret = bpf_map_update_elem(bpf_map__fd(data_map), &zero, result, 0); 43 if (CHECK(ret, "reset_result", "failed to reset result\n")) 44 goto out; 45 } 46 47 ret = 0; 48 out: 49 free(result); 50 return ret; 51 } 52 53 static void test_fexit_bpf2bpf_common(const char *obj_file, 54 const char *target_obj_file, 55 int prog_cnt, 56 const char **prog_name, 57 bool run_prog, 58 test_cb cb) 59 { 60 struct bpf_object *obj = NULL, *tgt_obj; 61 __u32 retval, tgt_prog_id, info_len; 62 struct bpf_prog_info prog_info = {}; 63 struct bpf_program **prog = NULL; 64 struct bpf_link **link = NULL; 65 int err, tgt_fd, i; 66 struct btf *btf; 67 68 err = bpf_prog_load(target_obj_file, BPF_PROG_TYPE_UNSPEC, 69 &tgt_obj, &tgt_fd); 70 if (!ASSERT_OK(err, "tgt_prog_load")) 71 return; 72 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, 73 .attach_prog_fd = tgt_fd, 74 ); 75 76 info_len = sizeof(prog_info); 77 err = bpf_obj_get_info_by_fd(tgt_fd, &prog_info, &info_len); 78 if (!ASSERT_OK(err, "tgt_fd_get_info")) 79 goto close_prog; 80 81 tgt_prog_id = prog_info.id; 82 btf = bpf_object__btf(tgt_obj); 83 84 link = calloc(sizeof(struct bpf_link *), prog_cnt); 85 if (!ASSERT_OK_PTR(link, "link_ptr")) 86 goto close_prog; 87 88 prog = calloc(sizeof(struct bpf_program *), prog_cnt); 89 if (!ASSERT_OK_PTR(prog, "prog_ptr")) 90 goto close_prog; 91 92 obj = bpf_object__open_file(obj_file, &opts); 93 if (!ASSERT_OK_PTR(obj, "obj_open")) 94 goto close_prog; 95 96 err = bpf_object__load(obj); 97 if (!ASSERT_OK(err, "obj_load")) 98 goto close_prog; 99 100 for (i = 0; i < prog_cnt; i++) { 101 struct bpf_link_info link_info; 102 char *tgt_name; 103 __s32 btf_id; 104 105 tgt_name = strstr(prog_name[i], "/"); 106 if (!ASSERT_OK_PTR(tgt_name, "tgt_name")) 107 goto close_prog; 108 btf_id = btf__find_by_name_kind(btf, tgt_name + 1, BTF_KIND_FUNC); 109 110 prog[i] = bpf_object__find_program_by_title(obj, prog_name[i]); 111 if (!ASSERT_OK_PTR(prog[i], prog_name[i])) 112 goto close_prog; 113 114 link[i] = bpf_program__attach_trace(prog[i]); 115 if (!ASSERT_OK_PTR(link[i], "attach_trace")) 116 goto close_prog; 117 118 info_len = sizeof(link_info); 119 memset(&link_info, 0, sizeof(link_info)); 120 err = bpf_obj_get_info_by_fd(bpf_link__fd(link[i]), 121 &link_info, &info_len); 122 ASSERT_OK(err, "link_fd_get_info"); 123 ASSERT_EQ(link_info.tracing.attach_type, 124 bpf_program__get_expected_attach_type(prog[i]), 125 "link_attach_type"); 126 ASSERT_EQ(link_info.tracing.target_obj_id, tgt_prog_id, "link_tgt_obj_id"); 127 ASSERT_EQ(link_info.tracing.target_btf_id, btf_id, "link_tgt_btf_id"); 128 } 129 130 if (cb) { 131 err = cb(obj); 132 if (err) 133 goto close_prog; 134 } 135 136 if (!run_prog) 137 goto close_prog; 138 139 err = bpf_prog_test_run(tgt_fd, 1, &pkt_v6, sizeof(pkt_v6), 140 NULL, NULL, &retval, NULL); 141 ASSERT_OK(err, "prog_run"); 142 ASSERT_EQ(retval, 0, "prog_run_ret"); 143 144 if (check_data_map(obj, prog_cnt, false)) 145 goto close_prog; 146 147 close_prog: 148 for (i = 0; i < prog_cnt; i++) 149 bpf_link__destroy(link[i]); 150 bpf_object__close(obj); 151 bpf_object__close(tgt_obj); 152 free(link); 153 free(prog); 154 } 155 156 static void test_target_no_callees(void) 157 { 158 const char *prog_name[] = { 159 "fexit/test_pkt_md_access", 160 }; 161 test_fexit_bpf2bpf_common("./fexit_bpf2bpf_simple.o", 162 "./test_pkt_md_access.o", 163 ARRAY_SIZE(prog_name), 164 prog_name, true, NULL); 165 } 166 167 static void test_target_yes_callees(void) 168 { 169 const char *prog_name[] = { 170 "fexit/test_pkt_access", 171 "fexit/test_pkt_access_subprog1", 172 "fexit/test_pkt_access_subprog2", 173 "fexit/test_pkt_access_subprog3", 174 }; 175 test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o", 176 "./test_pkt_access.o", 177 ARRAY_SIZE(prog_name), 178 prog_name, true, NULL); 179 } 180 181 static void test_func_replace(void) 182 { 183 const char *prog_name[] = { 184 "fexit/test_pkt_access", 185 "fexit/test_pkt_access_subprog1", 186 "fexit/test_pkt_access_subprog2", 187 "fexit/test_pkt_access_subprog3", 188 "freplace/get_skb_len", 189 "freplace/get_skb_ifindex", 190 "freplace/get_constant", 191 "freplace/test_pkt_write_access_subprog", 192 }; 193 test_fexit_bpf2bpf_common("./fexit_bpf2bpf.o", 194 "./test_pkt_access.o", 195 ARRAY_SIZE(prog_name), 196 prog_name, true, NULL); 197 } 198 199 static void test_func_replace_verify(void) 200 { 201 const char *prog_name[] = { 202 "freplace/do_bind", 203 }; 204 test_fexit_bpf2bpf_common("./freplace_connect4.o", 205 "./connect4_prog.o", 206 ARRAY_SIZE(prog_name), 207 prog_name, false, NULL); 208 } 209 210 static int test_second_attach(struct bpf_object *obj) 211 { 212 const char *prog_name = "freplace/get_constant"; 213 const char *tgt_name = prog_name + 9; /* cut off freplace/ */ 214 const char *tgt_obj_file = "./test_pkt_access.o"; 215 struct bpf_program *prog = NULL; 216 struct bpf_object *tgt_obj; 217 __u32 duration = 0, retval; 218 struct bpf_link *link; 219 int err = 0, tgt_fd; 220 221 prog = bpf_object__find_program_by_title(obj, prog_name); 222 if (CHECK(!prog, "find_prog", "prog %s not found\n", prog_name)) 223 return -ENOENT; 224 225 err = bpf_prog_load(tgt_obj_file, BPF_PROG_TYPE_UNSPEC, 226 &tgt_obj, &tgt_fd); 227 if (CHECK(err, "second_prog_load", "file %s err %d errno %d\n", 228 tgt_obj_file, err, errno)) 229 return err; 230 231 link = bpf_program__attach_freplace(prog, tgt_fd, tgt_name); 232 if (!ASSERT_OK_PTR(link, "second_link")) 233 goto out; 234 235 err = bpf_prog_test_run(tgt_fd, 1, &pkt_v6, sizeof(pkt_v6), 236 NULL, NULL, &retval, &duration); 237 if (CHECK(err || retval, "ipv6", 238 "err %d errno %d retval %d duration %d\n", 239 err, errno, retval, duration)) 240 goto out; 241 242 err = check_data_map(obj, 1, true); 243 if (err) 244 goto out; 245 246 out: 247 bpf_link__destroy(link); 248 bpf_object__close(tgt_obj); 249 return err; 250 } 251 252 static void test_func_replace_multi(void) 253 { 254 const char *prog_name[] = { 255 "freplace/get_constant", 256 }; 257 test_fexit_bpf2bpf_common("./freplace_get_constant.o", 258 "./test_pkt_access.o", 259 ARRAY_SIZE(prog_name), 260 prog_name, true, test_second_attach); 261 } 262 263 static void test_fmod_ret_freplace(void) 264 { 265 struct bpf_object *freplace_obj = NULL, *pkt_obj, *fmod_obj = NULL; 266 const char *freplace_name = "./freplace_get_constant.o"; 267 const char *fmod_ret_name = "./fmod_ret_freplace.o"; 268 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts); 269 const char *tgt_name = "./test_pkt_access.o"; 270 struct bpf_link *freplace_link = NULL; 271 struct bpf_program *prog; 272 __u32 duration = 0; 273 int err, pkt_fd; 274 275 err = bpf_prog_load(tgt_name, BPF_PROG_TYPE_UNSPEC, 276 &pkt_obj, &pkt_fd); 277 /* the target prog should load fine */ 278 if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n", 279 tgt_name, err, errno)) 280 return; 281 opts.attach_prog_fd = pkt_fd; 282 283 freplace_obj = bpf_object__open_file(freplace_name, &opts); 284 if (!ASSERT_OK_PTR(freplace_obj, "freplace_obj_open")) 285 goto out; 286 287 err = bpf_object__load(freplace_obj); 288 if (CHECK(err, "freplace_obj_load", "err %d\n", err)) 289 goto out; 290 291 prog = bpf_program__next(NULL, freplace_obj); 292 freplace_link = bpf_program__attach_trace(prog); 293 if (!ASSERT_OK_PTR(freplace_link, "freplace_attach_trace")) 294 goto out; 295 296 opts.attach_prog_fd = bpf_program__fd(prog); 297 fmod_obj = bpf_object__open_file(fmod_ret_name, &opts); 298 if (!ASSERT_OK_PTR(fmod_obj, "fmod_obj_open")) 299 goto out; 300 301 err = bpf_object__load(fmod_obj); 302 if (CHECK(!err, "fmod_obj_load", "loading fmod_ret should fail\n")) 303 goto out; 304 305 out: 306 bpf_link__destroy(freplace_link); 307 bpf_object__close(freplace_obj); 308 bpf_object__close(fmod_obj); 309 bpf_object__close(pkt_obj); 310 } 311 312 313 static void test_func_sockmap_update(void) 314 { 315 const char *prog_name[] = { 316 "freplace/cls_redirect", 317 }; 318 test_fexit_bpf2bpf_common("./freplace_cls_redirect.o", 319 "./test_cls_redirect.o", 320 ARRAY_SIZE(prog_name), 321 prog_name, false, NULL); 322 } 323 324 static void test_obj_load_failure_common(const char *obj_file, 325 const char *target_obj_file) 326 327 { 328 /* 329 * standalone test that asserts failure to load freplace prog 330 * because of invalid return code. 331 */ 332 struct bpf_object *obj = NULL, *pkt_obj; 333 int err, pkt_fd; 334 __u32 duration = 0; 335 336 err = bpf_prog_load(target_obj_file, BPF_PROG_TYPE_UNSPEC, 337 &pkt_obj, &pkt_fd); 338 /* the target prog should load fine */ 339 if (CHECK(err, "tgt_prog_load", "file %s err %d errno %d\n", 340 target_obj_file, err, errno)) 341 return; 342 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, 343 .attach_prog_fd = pkt_fd, 344 ); 345 346 obj = bpf_object__open_file(obj_file, &opts); 347 if (!ASSERT_OK_PTR(obj, "obj_open")) 348 goto close_prog; 349 350 /* It should fail to load the program */ 351 err = bpf_object__load(obj); 352 if (CHECK(!err, "bpf_obj_load should fail", "err %d\n", err)) 353 goto close_prog; 354 355 close_prog: 356 bpf_object__close(obj); 357 bpf_object__close(pkt_obj); 358 } 359 360 static void test_func_replace_return_code(void) 361 { 362 /* test invalid return code in the replaced program */ 363 test_obj_load_failure_common("./freplace_connect_v4_prog.o", 364 "./connect4_prog.o"); 365 } 366 367 static void test_func_map_prog_compatibility(void) 368 { 369 /* test with spin lock map value in the replaced program */ 370 test_obj_load_failure_common("./freplace_attach_probe.o", 371 "./test_attach_probe.o"); 372 } 373 374 void test_fexit_bpf2bpf(void) 375 { 376 if (test__start_subtest("target_no_callees")) 377 test_target_no_callees(); 378 if (test__start_subtest("target_yes_callees")) 379 test_target_yes_callees(); 380 if (test__start_subtest("func_replace")) 381 test_func_replace(); 382 if (test__start_subtest("func_replace_verify")) 383 test_func_replace_verify(); 384 if (test__start_subtest("func_sockmap_update")) 385 test_func_sockmap_update(); 386 if (test__start_subtest("func_replace_return_code")) 387 test_func_replace_return_code(); 388 if (test__start_subtest("func_map_prog_compatibility")) 389 test_func_map_prog_compatibility(); 390 if (test__start_subtest("func_replace_multi")) 391 test_func_replace_multi(); 392 if (test__start_subtest("fmod_ret_freplace")) 393 test_fmod_ret_freplace(); 394 } 395