1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2018 Facebook 3 4 #define _GNU_SOURCE 5 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <unistd.h> 9 10 #include <arpa/inet.h> 11 #include <netinet/in.h> 12 #include <sys/types.h> 13 #include <sys/select.h> 14 #include <sys/socket.h> 15 16 #include <linux/filter.h> 17 18 #include <bpf/bpf.h> 19 #include <bpf/libbpf.h> 20 21 #include "cgroup_helpers.h" 22 #include "bpf_rlimit.h" 23 24 #ifndef ENOTSUPP 25 # define ENOTSUPP 524 26 #endif 27 28 #ifndef ARRAY_SIZE 29 # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 30 #endif 31 32 #define CG_PATH "/foo" 33 #define CONNECT4_PROG_PATH "./connect4_prog.o" 34 #define CONNECT6_PROG_PATH "./connect6_prog.o" 35 #define SENDMSG4_PROG_PATH "./sendmsg4_prog.o" 36 #define SENDMSG6_PROG_PATH "./sendmsg6_prog.o" 37 38 #define SERV4_IP "192.168.1.254" 39 #define SERV4_REWRITE_IP "127.0.0.1" 40 #define SRC4_IP "172.16.0.1" 41 #define SRC4_REWRITE_IP "127.0.0.4" 42 #define SERV4_PORT 4040 43 #define SERV4_REWRITE_PORT 4444 44 45 #define SERV6_IP "face:b00c:1234:5678::abcd" 46 #define SERV6_REWRITE_IP "::1" 47 #define SERV6_V4MAPPED_IP "::ffff:192.168.0.4" 48 #define SRC6_IP "::1" 49 #define SRC6_REWRITE_IP "::6" 50 #define SERV6_PORT 6060 51 #define SERV6_REWRITE_PORT 6666 52 53 #define INET_NTOP_BUF 40 54 55 struct sock_addr_test; 56 57 typedef int (*load_fn)(const struct sock_addr_test *test); 58 typedef int (*info_fn)(int, struct sockaddr *, socklen_t *); 59 60 char bpf_log_buf[BPF_LOG_BUF_SIZE]; 61 62 struct sock_addr_test { 63 const char *descr; 64 /* BPF prog properties */ 65 load_fn loadfn; 66 enum bpf_attach_type expected_attach_type; 67 enum bpf_attach_type attach_type; 68 /* Socket properties */ 69 int domain; 70 int type; 71 /* IP:port pairs for BPF prog to override */ 72 const char *requested_ip; 73 unsigned short requested_port; 74 const char *expected_ip; 75 unsigned short expected_port; 76 const char *expected_src_ip; 77 /* Expected test result */ 78 enum { 79 LOAD_REJECT, 80 ATTACH_REJECT, 81 SYSCALL_EPERM, 82 SYSCALL_ENOTSUPP, 83 SUCCESS, 84 } expected_result; 85 }; 86 87 static int bind4_prog_load(const struct sock_addr_test *test); 88 static int bind6_prog_load(const struct sock_addr_test *test); 89 static int connect4_prog_load(const struct sock_addr_test *test); 90 static int connect6_prog_load(const struct sock_addr_test *test); 91 static int sendmsg_deny_prog_load(const struct sock_addr_test *test); 92 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test); 93 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test); 94 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test); 95 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test); 96 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test); 97 98 static struct sock_addr_test tests[] = { 99 /* bind */ 100 { 101 "bind4: load prog with wrong expected attach type", 102 bind4_prog_load, 103 BPF_CGROUP_INET6_BIND, 104 BPF_CGROUP_INET4_BIND, 105 AF_INET, 106 SOCK_STREAM, 107 NULL, 108 0, 109 NULL, 110 0, 111 NULL, 112 LOAD_REJECT, 113 }, 114 { 115 "bind4: attach prog with wrong attach type", 116 bind4_prog_load, 117 BPF_CGROUP_INET4_BIND, 118 BPF_CGROUP_INET6_BIND, 119 AF_INET, 120 SOCK_STREAM, 121 NULL, 122 0, 123 NULL, 124 0, 125 NULL, 126 ATTACH_REJECT, 127 }, 128 { 129 "bind4: rewrite IP & TCP port in", 130 bind4_prog_load, 131 BPF_CGROUP_INET4_BIND, 132 BPF_CGROUP_INET4_BIND, 133 AF_INET, 134 SOCK_STREAM, 135 SERV4_IP, 136 SERV4_PORT, 137 SERV4_REWRITE_IP, 138 SERV4_REWRITE_PORT, 139 NULL, 140 SUCCESS, 141 }, 142 { 143 "bind4: rewrite IP & UDP port in", 144 bind4_prog_load, 145 BPF_CGROUP_INET4_BIND, 146 BPF_CGROUP_INET4_BIND, 147 AF_INET, 148 SOCK_DGRAM, 149 SERV4_IP, 150 SERV4_PORT, 151 SERV4_REWRITE_IP, 152 SERV4_REWRITE_PORT, 153 NULL, 154 SUCCESS, 155 }, 156 { 157 "bind6: load prog with wrong expected attach type", 158 bind6_prog_load, 159 BPF_CGROUP_INET4_BIND, 160 BPF_CGROUP_INET6_BIND, 161 AF_INET6, 162 SOCK_STREAM, 163 NULL, 164 0, 165 NULL, 166 0, 167 NULL, 168 LOAD_REJECT, 169 }, 170 { 171 "bind6: attach prog with wrong attach type", 172 bind6_prog_load, 173 BPF_CGROUP_INET6_BIND, 174 BPF_CGROUP_INET4_BIND, 175 AF_INET, 176 SOCK_STREAM, 177 NULL, 178 0, 179 NULL, 180 0, 181 NULL, 182 ATTACH_REJECT, 183 }, 184 { 185 "bind6: rewrite IP & TCP port in", 186 bind6_prog_load, 187 BPF_CGROUP_INET6_BIND, 188 BPF_CGROUP_INET6_BIND, 189 AF_INET6, 190 SOCK_STREAM, 191 SERV6_IP, 192 SERV6_PORT, 193 SERV6_REWRITE_IP, 194 SERV6_REWRITE_PORT, 195 NULL, 196 SUCCESS, 197 }, 198 { 199 "bind6: rewrite IP & UDP port in", 200 bind6_prog_load, 201 BPF_CGROUP_INET6_BIND, 202 BPF_CGROUP_INET6_BIND, 203 AF_INET6, 204 SOCK_DGRAM, 205 SERV6_IP, 206 SERV6_PORT, 207 SERV6_REWRITE_IP, 208 SERV6_REWRITE_PORT, 209 NULL, 210 SUCCESS, 211 }, 212 213 /* connect */ 214 { 215 "connect4: load prog with wrong expected attach type", 216 connect4_prog_load, 217 BPF_CGROUP_INET6_CONNECT, 218 BPF_CGROUP_INET4_CONNECT, 219 AF_INET, 220 SOCK_STREAM, 221 NULL, 222 0, 223 NULL, 224 0, 225 NULL, 226 LOAD_REJECT, 227 }, 228 { 229 "connect4: attach prog with wrong attach type", 230 connect4_prog_load, 231 BPF_CGROUP_INET4_CONNECT, 232 BPF_CGROUP_INET6_CONNECT, 233 AF_INET, 234 SOCK_STREAM, 235 NULL, 236 0, 237 NULL, 238 0, 239 NULL, 240 ATTACH_REJECT, 241 }, 242 { 243 "connect4: rewrite IP & TCP port", 244 connect4_prog_load, 245 BPF_CGROUP_INET4_CONNECT, 246 BPF_CGROUP_INET4_CONNECT, 247 AF_INET, 248 SOCK_STREAM, 249 SERV4_IP, 250 SERV4_PORT, 251 SERV4_REWRITE_IP, 252 SERV4_REWRITE_PORT, 253 SRC4_REWRITE_IP, 254 SUCCESS, 255 }, 256 { 257 "connect4: rewrite IP & UDP port", 258 connect4_prog_load, 259 BPF_CGROUP_INET4_CONNECT, 260 BPF_CGROUP_INET4_CONNECT, 261 AF_INET, 262 SOCK_DGRAM, 263 SERV4_IP, 264 SERV4_PORT, 265 SERV4_REWRITE_IP, 266 SERV4_REWRITE_PORT, 267 SRC4_REWRITE_IP, 268 SUCCESS, 269 }, 270 { 271 "connect6: load prog with wrong expected attach type", 272 connect6_prog_load, 273 BPF_CGROUP_INET4_CONNECT, 274 BPF_CGROUP_INET6_CONNECT, 275 AF_INET6, 276 SOCK_STREAM, 277 NULL, 278 0, 279 NULL, 280 0, 281 NULL, 282 LOAD_REJECT, 283 }, 284 { 285 "connect6: attach prog with wrong attach type", 286 connect6_prog_load, 287 BPF_CGROUP_INET6_CONNECT, 288 BPF_CGROUP_INET4_CONNECT, 289 AF_INET, 290 SOCK_STREAM, 291 NULL, 292 0, 293 NULL, 294 0, 295 NULL, 296 ATTACH_REJECT, 297 }, 298 { 299 "connect6: rewrite IP & TCP port", 300 connect6_prog_load, 301 BPF_CGROUP_INET6_CONNECT, 302 BPF_CGROUP_INET6_CONNECT, 303 AF_INET6, 304 SOCK_STREAM, 305 SERV6_IP, 306 SERV6_PORT, 307 SERV6_REWRITE_IP, 308 SERV6_REWRITE_PORT, 309 SRC6_REWRITE_IP, 310 SUCCESS, 311 }, 312 { 313 "connect6: rewrite IP & UDP port", 314 connect6_prog_load, 315 BPF_CGROUP_INET6_CONNECT, 316 BPF_CGROUP_INET6_CONNECT, 317 AF_INET6, 318 SOCK_DGRAM, 319 SERV6_IP, 320 SERV6_PORT, 321 SERV6_REWRITE_IP, 322 SERV6_REWRITE_PORT, 323 SRC6_REWRITE_IP, 324 SUCCESS, 325 }, 326 327 /* sendmsg */ 328 { 329 "sendmsg4: load prog with wrong expected attach type", 330 sendmsg4_rw_asm_prog_load, 331 BPF_CGROUP_UDP6_SENDMSG, 332 BPF_CGROUP_UDP4_SENDMSG, 333 AF_INET, 334 SOCK_DGRAM, 335 NULL, 336 0, 337 NULL, 338 0, 339 NULL, 340 LOAD_REJECT, 341 }, 342 { 343 "sendmsg4: attach prog with wrong attach type", 344 sendmsg4_rw_asm_prog_load, 345 BPF_CGROUP_UDP4_SENDMSG, 346 BPF_CGROUP_UDP6_SENDMSG, 347 AF_INET, 348 SOCK_DGRAM, 349 NULL, 350 0, 351 NULL, 352 0, 353 NULL, 354 ATTACH_REJECT, 355 }, 356 { 357 "sendmsg4: rewrite IP & port (asm)", 358 sendmsg4_rw_asm_prog_load, 359 BPF_CGROUP_UDP4_SENDMSG, 360 BPF_CGROUP_UDP4_SENDMSG, 361 AF_INET, 362 SOCK_DGRAM, 363 SERV4_IP, 364 SERV4_PORT, 365 SERV4_REWRITE_IP, 366 SERV4_REWRITE_PORT, 367 SRC4_REWRITE_IP, 368 SUCCESS, 369 }, 370 { 371 "sendmsg4: rewrite IP & port (C)", 372 sendmsg4_rw_c_prog_load, 373 BPF_CGROUP_UDP4_SENDMSG, 374 BPF_CGROUP_UDP4_SENDMSG, 375 AF_INET, 376 SOCK_DGRAM, 377 SERV4_IP, 378 SERV4_PORT, 379 SERV4_REWRITE_IP, 380 SERV4_REWRITE_PORT, 381 SRC4_REWRITE_IP, 382 SUCCESS, 383 }, 384 { 385 "sendmsg4: deny call", 386 sendmsg_deny_prog_load, 387 BPF_CGROUP_UDP4_SENDMSG, 388 BPF_CGROUP_UDP4_SENDMSG, 389 AF_INET, 390 SOCK_DGRAM, 391 SERV4_IP, 392 SERV4_PORT, 393 SERV4_REWRITE_IP, 394 SERV4_REWRITE_PORT, 395 SRC4_REWRITE_IP, 396 SYSCALL_EPERM, 397 }, 398 { 399 "sendmsg6: load prog with wrong expected attach type", 400 sendmsg6_rw_asm_prog_load, 401 BPF_CGROUP_UDP4_SENDMSG, 402 BPF_CGROUP_UDP6_SENDMSG, 403 AF_INET6, 404 SOCK_DGRAM, 405 NULL, 406 0, 407 NULL, 408 0, 409 NULL, 410 LOAD_REJECT, 411 }, 412 { 413 "sendmsg6: attach prog with wrong attach type", 414 sendmsg6_rw_asm_prog_load, 415 BPF_CGROUP_UDP6_SENDMSG, 416 BPF_CGROUP_UDP4_SENDMSG, 417 AF_INET6, 418 SOCK_DGRAM, 419 NULL, 420 0, 421 NULL, 422 0, 423 NULL, 424 ATTACH_REJECT, 425 }, 426 { 427 "sendmsg6: rewrite IP & port (asm)", 428 sendmsg6_rw_asm_prog_load, 429 BPF_CGROUP_UDP6_SENDMSG, 430 BPF_CGROUP_UDP6_SENDMSG, 431 AF_INET6, 432 SOCK_DGRAM, 433 SERV6_IP, 434 SERV6_PORT, 435 SERV6_REWRITE_IP, 436 SERV6_REWRITE_PORT, 437 SRC6_REWRITE_IP, 438 SUCCESS, 439 }, 440 { 441 "sendmsg6: rewrite IP & port (C)", 442 sendmsg6_rw_c_prog_load, 443 BPF_CGROUP_UDP6_SENDMSG, 444 BPF_CGROUP_UDP6_SENDMSG, 445 AF_INET6, 446 SOCK_DGRAM, 447 SERV6_IP, 448 SERV6_PORT, 449 SERV6_REWRITE_IP, 450 SERV6_REWRITE_PORT, 451 SRC6_REWRITE_IP, 452 SUCCESS, 453 }, 454 { 455 "sendmsg6: IPv4-mapped IPv6", 456 sendmsg6_rw_v4mapped_prog_load, 457 BPF_CGROUP_UDP6_SENDMSG, 458 BPF_CGROUP_UDP6_SENDMSG, 459 AF_INET6, 460 SOCK_DGRAM, 461 SERV6_IP, 462 SERV6_PORT, 463 SERV6_REWRITE_IP, 464 SERV6_REWRITE_PORT, 465 SRC6_REWRITE_IP, 466 SYSCALL_ENOTSUPP, 467 }, 468 { 469 "sendmsg6: deny call", 470 sendmsg_deny_prog_load, 471 BPF_CGROUP_UDP6_SENDMSG, 472 BPF_CGROUP_UDP6_SENDMSG, 473 AF_INET6, 474 SOCK_DGRAM, 475 SERV6_IP, 476 SERV6_PORT, 477 SERV6_REWRITE_IP, 478 SERV6_REWRITE_PORT, 479 SRC6_REWRITE_IP, 480 SYSCALL_EPERM, 481 }, 482 }; 483 484 static int mk_sockaddr(int domain, const char *ip, unsigned short port, 485 struct sockaddr *addr, socklen_t addr_len) 486 { 487 struct sockaddr_in6 *addr6; 488 struct sockaddr_in *addr4; 489 490 if (domain != AF_INET && domain != AF_INET6) { 491 log_err("Unsupported address family"); 492 return -1; 493 } 494 495 memset(addr, 0, addr_len); 496 497 if (domain == AF_INET) { 498 if (addr_len < sizeof(struct sockaddr_in)) 499 return -1; 500 addr4 = (struct sockaddr_in *)addr; 501 addr4->sin_family = domain; 502 addr4->sin_port = htons(port); 503 if (inet_pton(domain, ip, (void *)&addr4->sin_addr) != 1) { 504 log_err("Invalid IPv4: %s", ip); 505 return -1; 506 } 507 } else if (domain == AF_INET6) { 508 if (addr_len < sizeof(struct sockaddr_in6)) 509 return -1; 510 addr6 = (struct sockaddr_in6 *)addr; 511 addr6->sin6_family = domain; 512 addr6->sin6_port = htons(port); 513 if (inet_pton(domain, ip, (void *)&addr6->sin6_addr) != 1) { 514 log_err("Invalid IPv6: %s", ip); 515 return -1; 516 } 517 } 518 519 return 0; 520 } 521 522 static int load_insns(const struct sock_addr_test *test, 523 const struct bpf_insn *insns, size_t insns_cnt) 524 { 525 struct bpf_load_program_attr load_attr; 526 int ret; 527 528 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 529 load_attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; 530 load_attr.expected_attach_type = test->expected_attach_type; 531 load_attr.insns = insns; 532 load_attr.insns_cnt = insns_cnt; 533 load_attr.license = "GPL"; 534 535 ret = bpf_load_program_xattr(&load_attr, bpf_log_buf, BPF_LOG_BUF_SIZE); 536 if (ret < 0 && test->expected_result != LOAD_REJECT) { 537 log_err(">>> Loading program error.\n" 538 ">>> Verifier output:\n%s\n-------\n", bpf_log_buf); 539 } 540 541 return ret; 542 } 543 544 /* [1] These testing programs try to read different context fields, including 545 * narrow loads of different sizes from user_ip4 and user_ip6, and write to 546 * those allowed to be overridden. 547 * 548 * [2] BPF_LD_IMM64 & BPF_JMP_REG are used below whenever there is a need to 549 * compare a register with unsigned 32bit integer. BPF_JMP_IMM can't be used 550 * in such cases since it accepts only _signed_ 32bit integer as IMM 551 * argument. Also note that BPF_LD_IMM64 contains 2 instructions what matters 552 * to count jumps properly. 553 */ 554 555 static int bind4_prog_load(const struct sock_addr_test *test) 556 { 557 union { 558 uint8_t u4_addr8[4]; 559 uint16_t u4_addr16[2]; 560 uint32_t u4_addr32; 561 } ip4; 562 struct sockaddr_in addr4_rw; 563 564 if (inet_pton(AF_INET, SERV4_IP, (void *)&ip4) != 1) { 565 log_err("Invalid IPv4: %s", SERV4_IP); 566 return -1; 567 } 568 569 if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT, 570 (struct sockaddr *)&addr4_rw, sizeof(addr4_rw)) == -1) 571 return -1; 572 573 /* See [1]. */ 574 struct bpf_insn insns[] = { 575 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 576 577 /* if (sk.family == AF_INET && */ 578 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 579 offsetof(struct bpf_sock_addr, family)), 580 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 16), 581 582 /* (sk.type == SOCK_DGRAM || sk.type == SOCK_STREAM) && */ 583 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 584 offsetof(struct bpf_sock_addr, type)), 585 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 1), 586 BPF_JMP_A(1), 587 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_STREAM, 12), 588 589 /* 1st_byte_of_user_ip4 == expected && */ 590 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6, 591 offsetof(struct bpf_sock_addr, user_ip4)), 592 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[0], 10), 593 594 /* 1st_half_of_user_ip4 == expected && */ 595 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6, 596 offsetof(struct bpf_sock_addr, user_ip4)), 597 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[0], 8), 598 599 /* whole_user_ip4 == expected) { */ 600 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 601 offsetof(struct bpf_sock_addr, user_ip4)), 602 BPF_LD_IMM64(BPF_REG_8, ip4.u4_addr32), /* See [2]. */ 603 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 4), 604 605 /* user_ip4 = addr4_rw.sin_addr */ 606 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_addr.s_addr), 607 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 608 offsetof(struct bpf_sock_addr, user_ip4)), 609 610 /* user_port = addr4_rw.sin_port */ 611 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_port), 612 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 613 offsetof(struct bpf_sock_addr, user_port)), 614 /* } */ 615 616 /* return 1 */ 617 BPF_MOV64_IMM(BPF_REG_0, 1), 618 BPF_EXIT_INSN(), 619 }; 620 621 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 622 } 623 624 static int bind6_prog_load(const struct sock_addr_test *test) 625 { 626 struct sockaddr_in6 addr6_rw; 627 struct in6_addr ip6; 628 629 if (inet_pton(AF_INET6, SERV6_IP, (void *)&ip6) != 1) { 630 log_err("Invalid IPv6: %s", SERV6_IP); 631 return -1; 632 } 633 634 if (mk_sockaddr(AF_INET6, SERV6_REWRITE_IP, SERV6_REWRITE_PORT, 635 (struct sockaddr *)&addr6_rw, sizeof(addr6_rw)) == -1) 636 return -1; 637 638 /* See [1]. */ 639 struct bpf_insn insns[] = { 640 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 641 642 /* if (sk.family == AF_INET6 && */ 643 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 644 offsetof(struct bpf_sock_addr, family)), 645 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18), 646 647 /* 5th_byte_of_user_ip6 == expected && */ 648 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6, 649 offsetof(struct bpf_sock_addr, user_ip6[1])), 650 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr[4], 16), 651 652 /* 3rd_half_of_user_ip6 == expected && */ 653 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6, 654 offsetof(struct bpf_sock_addr, user_ip6[1])), 655 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr16[2], 14), 656 657 /* last_word_of_user_ip6 == expected) { */ 658 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 659 offsetof(struct bpf_sock_addr, user_ip6[3])), 660 BPF_LD_IMM64(BPF_REG_8, ip6.s6_addr32[3]), /* See [2]. */ 661 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 10), 662 663 664 #define STORE_IPV6_WORD(N) \ 665 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_addr.s6_addr32[N]), \ 666 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, \ 667 offsetof(struct bpf_sock_addr, user_ip6[N])) 668 669 /* user_ip6 = addr6_rw.sin6_addr */ 670 STORE_IPV6_WORD(0), 671 STORE_IPV6_WORD(1), 672 STORE_IPV6_WORD(2), 673 STORE_IPV6_WORD(3), 674 675 /* user_port = addr6_rw.sin6_port */ 676 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_port), 677 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 678 offsetof(struct bpf_sock_addr, user_port)), 679 680 /* } */ 681 682 /* return 1 */ 683 BPF_MOV64_IMM(BPF_REG_0, 1), 684 BPF_EXIT_INSN(), 685 }; 686 687 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 688 } 689 690 static int load_path(const struct sock_addr_test *test, const char *path) 691 { 692 struct bpf_prog_load_attr attr; 693 struct bpf_object *obj; 694 int prog_fd; 695 696 memset(&attr, 0, sizeof(struct bpf_prog_load_attr)); 697 attr.file = path; 698 attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; 699 attr.expected_attach_type = test->expected_attach_type; 700 701 if (bpf_prog_load_xattr(&attr, &obj, &prog_fd)) { 702 if (test->expected_result != LOAD_REJECT) 703 log_err(">>> Loading program (%s) error.\n", path); 704 return -1; 705 } 706 707 return prog_fd; 708 } 709 710 static int connect4_prog_load(const struct sock_addr_test *test) 711 { 712 return load_path(test, CONNECT4_PROG_PATH); 713 } 714 715 static int connect6_prog_load(const struct sock_addr_test *test) 716 { 717 return load_path(test, CONNECT6_PROG_PATH); 718 } 719 720 static int sendmsg_deny_prog_load(const struct sock_addr_test *test) 721 { 722 struct bpf_insn insns[] = { 723 /* return 0 */ 724 BPF_MOV64_IMM(BPF_REG_0, 0), 725 BPF_EXIT_INSN(), 726 }; 727 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 728 } 729 730 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test) 731 { 732 struct sockaddr_in dst4_rw_addr; 733 struct in_addr src4_rw_ip; 734 735 if (inet_pton(AF_INET, SRC4_REWRITE_IP, (void *)&src4_rw_ip) != 1) { 736 log_err("Invalid IPv4: %s", SRC4_REWRITE_IP); 737 return -1; 738 } 739 740 if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT, 741 (struct sockaddr *)&dst4_rw_addr, 742 sizeof(dst4_rw_addr)) == -1) 743 return -1; 744 745 struct bpf_insn insns[] = { 746 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 747 748 /* if (sk.family == AF_INET && */ 749 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 750 offsetof(struct bpf_sock_addr, family)), 751 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 8), 752 753 /* sk.type == SOCK_DGRAM) { */ 754 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 755 offsetof(struct bpf_sock_addr, type)), 756 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 6), 757 758 /* msg_src_ip4 = src4_rw_ip */ 759 BPF_MOV32_IMM(BPF_REG_7, src4_rw_ip.s_addr), 760 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 761 offsetof(struct bpf_sock_addr, msg_src_ip4)), 762 763 /* user_ip4 = dst4_rw_addr.sin_addr */ 764 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_addr.s_addr), 765 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 766 offsetof(struct bpf_sock_addr, user_ip4)), 767 768 /* user_port = dst4_rw_addr.sin_port */ 769 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_port), 770 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 771 offsetof(struct bpf_sock_addr, user_port)), 772 /* } */ 773 774 /* return 1 */ 775 BPF_MOV64_IMM(BPF_REG_0, 1), 776 BPF_EXIT_INSN(), 777 }; 778 779 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 780 } 781 782 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test) 783 { 784 return load_path(test, SENDMSG4_PROG_PATH); 785 } 786 787 static int sendmsg6_rw_dst_asm_prog_load(const struct sock_addr_test *test, 788 const char *rw_dst_ip) 789 { 790 struct sockaddr_in6 dst6_rw_addr; 791 struct in6_addr src6_rw_ip; 792 793 if (inet_pton(AF_INET6, SRC6_REWRITE_IP, (void *)&src6_rw_ip) != 1) { 794 log_err("Invalid IPv6: %s", SRC6_REWRITE_IP); 795 return -1; 796 } 797 798 if (mk_sockaddr(AF_INET6, rw_dst_ip, SERV6_REWRITE_PORT, 799 (struct sockaddr *)&dst6_rw_addr, 800 sizeof(dst6_rw_addr)) == -1) 801 return -1; 802 803 struct bpf_insn insns[] = { 804 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 805 806 /* if (sk.family == AF_INET6) { */ 807 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 808 offsetof(struct bpf_sock_addr, family)), 809 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18), 810 811 #define STORE_IPV6_WORD_N(DST, SRC, N) \ 812 BPF_MOV32_IMM(BPF_REG_7, SRC[N]), \ 813 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, \ 814 offsetof(struct bpf_sock_addr, DST[N])) 815 816 #define STORE_IPV6(DST, SRC) \ 817 STORE_IPV6_WORD_N(DST, SRC, 0), \ 818 STORE_IPV6_WORD_N(DST, SRC, 1), \ 819 STORE_IPV6_WORD_N(DST, SRC, 2), \ 820 STORE_IPV6_WORD_N(DST, SRC, 3) 821 822 STORE_IPV6(msg_src_ip6, src6_rw_ip.s6_addr32), 823 STORE_IPV6(user_ip6, dst6_rw_addr.sin6_addr.s6_addr32), 824 825 /* user_port = dst6_rw_addr.sin6_port */ 826 BPF_MOV32_IMM(BPF_REG_7, dst6_rw_addr.sin6_port), 827 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 828 offsetof(struct bpf_sock_addr, user_port)), 829 830 /* } */ 831 832 /* return 1 */ 833 BPF_MOV64_IMM(BPF_REG_0, 1), 834 BPF_EXIT_INSN(), 835 }; 836 837 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 838 } 839 840 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test) 841 { 842 return sendmsg6_rw_dst_asm_prog_load(test, SERV6_REWRITE_IP); 843 } 844 845 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test) 846 { 847 return sendmsg6_rw_dst_asm_prog_load(test, SERV6_V4MAPPED_IP); 848 } 849 850 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test) 851 { 852 return load_path(test, SENDMSG6_PROG_PATH); 853 } 854 855 static int cmp_addr(const struct sockaddr_storage *addr1, 856 const struct sockaddr_storage *addr2, int cmp_port) 857 { 858 const struct sockaddr_in *four1, *four2; 859 const struct sockaddr_in6 *six1, *six2; 860 861 if (addr1->ss_family != addr2->ss_family) 862 return -1; 863 864 if (addr1->ss_family == AF_INET) { 865 four1 = (const struct sockaddr_in *)addr1; 866 four2 = (const struct sockaddr_in *)addr2; 867 return !((four1->sin_port == four2->sin_port || !cmp_port) && 868 four1->sin_addr.s_addr == four2->sin_addr.s_addr); 869 } else if (addr1->ss_family == AF_INET6) { 870 six1 = (const struct sockaddr_in6 *)addr1; 871 six2 = (const struct sockaddr_in6 *)addr2; 872 return !((six1->sin6_port == six2->sin6_port || !cmp_port) && 873 !memcmp(&six1->sin6_addr, &six2->sin6_addr, 874 sizeof(struct in6_addr))); 875 } 876 877 return -1; 878 } 879 880 static int cmp_sock_addr(info_fn fn, int sock1, 881 const struct sockaddr_storage *addr2, int cmp_port) 882 { 883 struct sockaddr_storage addr1; 884 socklen_t len1 = sizeof(addr1); 885 886 memset(&addr1, 0, len1); 887 if (fn(sock1, (struct sockaddr *)&addr1, (socklen_t *)&len1) != 0) 888 return -1; 889 890 return cmp_addr(&addr1, addr2, cmp_port); 891 } 892 893 static int cmp_local_ip(int sock1, const struct sockaddr_storage *addr2) 894 { 895 return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 0); 896 } 897 898 static int cmp_local_addr(int sock1, const struct sockaddr_storage *addr2) 899 { 900 return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 1); 901 } 902 903 static int cmp_peer_addr(int sock1, const struct sockaddr_storage *addr2) 904 { 905 return cmp_sock_addr(getpeername, sock1, addr2, /*cmp_port*/ 1); 906 } 907 908 static int start_server(int type, const struct sockaddr_storage *addr, 909 socklen_t addr_len) 910 { 911 int fd; 912 913 fd = socket(addr->ss_family, type, 0); 914 if (fd == -1) { 915 log_err("Failed to create server socket"); 916 goto out; 917 } 918 919 if (bind(fd, (const struct sockaddr *)addr, addr_len) == -1) { 920 log_err("Failed to bind server socket"); 921 goto close_out; 922 } 923 924 if (type == SOCK_STREAM) { 925 if (listen(fd, 128) == -1) { 926 log_err("Failed to listen on server socket"); 927 goto close_out; 928 } 929 } 930 931 goto out; 932 close_out: 933 close(fd); 934 fd = -1; 935 out: 936 return fd; 937 } 938 939 static int connect_to_server(int type, const struct sockaddr_storage *addr, 940 socklen_t addr_len) 941 { 942 int domain; 943 int fd = -1; 944 945 domain = addr->ss_family; 946 947 if (domain != AF_INET && domain != AF_INET6) { 948 log_err("Unsupported address family"); 949 goto err; 950 } 951 952 fd = socket(domain, type, 0); 953 if (fd == -1) { 954 log_err("Failed to create client socket"); 955 goto err; 956 } 957 958 if (connect(fd, (const struct sockaddr *)addr, addr_len) == -1) { 959 log_err("Fail to connect to server"); 960 goto err; 961 } 962 963 goto out; 964 err: 965 close(fd); 966 fd = -1; 967 out: 968 return fd; 969 } 970 971 int init_pktinfo(int domain, struct cmsghdr *cmsg) 972 { 973 struct in6_pktinfo *pktinfo6; 974 struct in_pktinfo *pktinfo4; 975 976 if (domain == AF_INET) { 977 cmsg->cmsg_level = SOL_IP; 978 cmsg->cmsg_type = IP_PKTINFO; 979 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); 980 pktinfo4 = (struct in_pktinfo *)CMSG_DATA(cmsg); 981 memset(pktinfo4, 0, sizeof(struct in_pktinfo)); 982 if (inet_pton(domain, SRC4_IP, 983 (void *)&pktinfo4->ipi_spec_dst) != 1) 984 return -1; 985 } else if (domain == AF_INET6) { 986 cmsg->cmsg_level = SOL_IPV6; 987 cmsg->cmsg_type = IPV6_PKTINFO; 988 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 989 pktinfo6 = (struct in6_pktinfo *)CMSG_DATA(cmsg); 990 memset(pktinfo6, 0, sizeof(struct in6_pktinfo)); 991 if (inet_pton(domain, SRC6_IP, 992 (void *)&pktinfo6->ipi6_addr) != 1) 993 return -1; 994 } else { 995 return -1; 996 } 997 998 return 0; 999 } 1000 1001 static int sendmsg_to_server(const struct sockaddr_storage *addr, 1002 socklen_t addr_len, int set_cmsg, int *syscall_err) 1003 { 1004 union { 1005 char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))]; 1006 struct cmsghdr align; 1007 } control6; 1008 union { 1009 char buf[CMSG_SPACE(sizeof(struct in_pktinfo))]; 1010 struct cmsghdr align; 1011 } control4; 1012 struct msghdr hdr; 1013 struct iovec iov; 1014 char data = 'a'; 1015 int domain; 1016 int fd = -1; 1017 1018 domain = addr->ss_family; 1019 1020 if (domain != AF_INET && domain != AF_INET6) { 1021 log_err("Unsupported address family"); 1022 goto err; 1023 } 1024 1025 fd = socket(domain, SOCK_DGRAM, 0); 1026 if (fd == -1) { 1027 log_err("Failed to create client socket"); 1028 goto err; 1029 } 1030 1031 memset(&iov, 0, sizeof(iov)); 1032 iov.iov_base = &data; 1033 iov.iov_len = sizeof(data); 1034 1035 memset(&hdr, 0, sizeof(hdr)); 1036 hdr.msg_name = (void *)addr; 1037 hdr.msg_namelen = addr_len; 1038 hdr.msg_iov = &iov; 1039 hdr.msg_iovlen = 1; 1040 1041 if (set_cmsg) { 1042 if (domain == AF_INET) { 1043 hdr.msg_control = &control4; 1044 hdr.msg_controllen = sizeof(control4.buf); 1045 } else if (domain == AF_INET6) { 1046 hdr.msg_control = &control6; 1047 hdr.msg_controllen = sizeof(control6.buf); 1048 } 1049 if (init_pktinfo(domain, CMSG_FIRSTHDR(&hdr))) { 1050 log_err("Fail to init pktinfo"); 1051 goto err; 1052 } 1053 } 1054 1055 if (sendmsg(fd, &hdr, 0) != sizeof(data)) { 1056 log_err("Fail to send message to server"); 1057 *syscall_err = errno; 1058 goto err; 1059 } 1060 1061 goto out; 1062 err: 1063 close(fd); 1064 fd = -1; 1065 out: 1066 return fd; 1067 } 1068 1069 static int recvmsg_from_client(int sockfd, struct sockaddr_storage *src_addr) 1070 { 1071 struct timeval tv; 1072 struct msghdr hdr; 1073 struct iovec iov; 1074 char data[64]; 1075 fd_set rfds; 1076 1077 FD_ZERO(&rfds); 1078 FD_SET(sockfd, &rfds); 1079 1080 tv.tv_sec = 2; 1081 tv.tv_usec = 0; 1082 1083 if (select(sockfd + 1, &rfds, NULL, NULL, &tv) <= 0 || 1084 !FD_ISSET(sockfd, &rfds)) 1085 return -1; 1086 1087 memset(&iov, 0, sizeof(iov)); 1088 iov.iov_base = data; 1089 iov.iov_len = sizeof(data); 1090 1091 memset(&hdr, 0, sizeof(hdr)); 1092 hdr.msg_name = src_addr; 1093 hdr.msg_namelen = sizeof(struct sockaddr_storage); 1094 hdr.msg_iov = &iov; 1095 hdr.msg_iovlen = 1; 1096 1097 return recvmsg(sockfd, &hdr, 0); 1098 } 1099 1100 static int init_addrs(const struct sock_addr_test *test, 1101 struct sockaddr_storage *requested_addr, 1102 struct sockaddr_storage *expected_addr, 1103 struct sockaddr_storage *expected_src_addr) 1104 { 1105 socklen_t addr_len = sizeof(struct sockaddr_storage); 1106 1107 if (mk_sockaddr(test->domain, test->expected_ip, test->expected_port, 1108 (struct sockaddr *)expected_addr, addr_len) == -1) 1109 goto err; 1110 1111 if (mk_sockaddr(test->domain, test->requested_ip, test->requested_port, 1112 (struct sockaddr *)requested_addr, addr_len) == -1) 1113 goto err; 1114 1115 if (test->expected_src_ip && 1116 mk_sockaddr(test->domain, test->expected_src_ip, 0, 1117 (struct sockaddr *)expected_src_addr, addr_len) == -1) 1118 goto err; 1119 1120 return 0; 1121 err: 1122 return -1; 1123 } 1124 1125 static int run_bind_test_case(const struct sock_addr_test *test) 1126 { 1127 socklen_t addr_len = sizeof(struct sockaddr_storage); 1128 struct sockaddr_storage requested_addr; 1129 struct sockaddr_storage expected_addr; 1130 int clientfd = -1; 1131 int servfd = -1; 1132 int err = 0; 1133 1134 if (init_addrs(test, &requested_addr, &expected_addr, NULL)) 1135 goto err; 1136 1137 servfd = start_server(test->type, &requested_addr, addr_len); 1138 if (servfd == -1) 1139 goto err; 1140 1141 if (cmp_local_addr(servfd, &expected_addr)) 1142 goto err; 1143 1144 /* Try to connect to server just in case */ 1145 clientfd = connect_to_server(test->type, &expected_addr, addr_len); 1146 if (clientfd == -1) 1147 goto err; 1148 1149 goto out; 1150 err: 1151 err = -1; 1152 out: 1153 close(clientfd); 1154 close(servfd); 1155 return err; 1156 } 1157 1158 static int run_connect_test_case(const struct sock_addr_test *test) 1159 { 1160 socklen_t addr_len = sizeof(struct sockaddr_storage); 1161 struct sockaddr_storage expected_src_addr; 1162 struct sockaddr_storage requested_addr; 1163 struct sockaddr_storage expected_addr; 1164 int clientfd = -1; 1165 int servfd = -1; 1166 int err = 0; 1167 1168 if (init_addrs(test, &requested_addr, &expected_addr, 1169 &expected_src_addr)) 1170 goto err; 1171 1172 /* Prepare server to connect to */ 1173 servfd = start_server(test->type, &expected_addr, addr_len); 1174 if (servfd == -1) 1175 goto err; 1176 1177 clientfd = connect_to_server(test->type, &requested_addr, addr_len); 1178 if (clientfd == -1) 1179 goto err; 1180 1181 /* Make sure src and dst addrs were overridden properly */ 1182 if (cmp_peer_addr(clientfd, &expected_addr)) 1183 goto err; 1184 1185 if (cmp_local_ip(clientfd, &expected_src_addr)) 1186 goto err; 1187 1188 goto out; 1189 err: 1190 err = -1; 1191 out: 1192 close(clientfd); 1193 close(servfd); 1194 return err; 1195 } 1196 1197 static int run_sendmsg_test_case(const struct sock_addr_test *test) 1198 { 1199 socklen_t addr_len = sizeof(struct sockaddr_storage); 1200 struct sockaddr_storage expected_src_addr; 1201 struct sockaddr_storage requested_addr; 1202 struct sockaddr_storage expected_addr; 1203 struct sockaddr_storage real_src_addr; 1204 int clientfd = -1; 1205 int servfd = -1; 1206 int set_cmsg; 1207 int err = 0; 1208 1209 if (test->type != SOCK_DGRAM) 1210 goto err; 1211 1212 if (init_addrs(test, &requested_addr, &expected_addr, 1213 &expected_src_addr)) 1214 goto err; 1215 1216 /* Prepare server to sendmsg to */ 1217 servfd = start_server(test->type, &expected_addr, addr_len); 1218 if (servfd == -1) 1219 goto err; 1220 1221 for (set_cmsg = 0; set_cmsg <= 1; ++set_cmsg) { 1222 if (clientfd >= 0) 1223 close(clientfd); 1224 1225 clientfd = sendmsg_to_server(&requested_addr, addr_len, 1226 set_cmsg, &err); 1227 if (err) 1228 goto out; 1229 else if (clientfd == -1) 1230 goto err; 1231 1232 /* Try to receive message on server instead of using 1233 * getpeername(2) on client socket, to check that client's 1234 * destination address was rewritten properly, since 1235 * getpeername(2) doesn't work with unconnected datagram 1236 * sockets. 1237 * 1238 * Get source address from recvmsg(2) as well to make sure 1239 * source was rewritten properly: getsockname(2) can't be used 1240 * since socket is unconnected and source defined for one 1241 * specific packet may differ from the one used by default and 1242 * returned by getsockname(2). 1243 */ 1244 if (recvmsg_from_client(servfd, &real_src_addr) == -1) 1245 goto err; 1246 1247 if (cmp_addr(&real_src_addr, &expected_src_addr, /*cmp_port*/0)) 1248 goto err; 1249 } 1250 1251 goto out; 1252 err: 1253 err = -1; 1254 out: 1255 close(clientfd); 1256 close(servfd); 1257 return err; 1258 } 1259 1260 static int run_test_case(int cgfd, const struct sock_addr_test *test) 1261 { 1262 int progfd = -1; 1263 int err = 0; 1264 1265 printf("Test case: %s .. ", test->descr); 1266 1267 progfd = test->loadfn(test); 1268 if (test->expected_result == LOAD_REJECT && progfd < 0) 1269 goto out; 1270 else if (test->expected_result == LOAD_REJECT || progfd < 0) 1271 goto err; 1272 1273 err = bpf_prog_attach(progfd, cgfd, test->attach_type, 1274 BPF_F_ALLOW_OVERRIDE); 1275 if (test->expected_result == ATTACH_REJECT && err) { 1276 err = 0; /* error was expected, reset it */ 1277 goto out; 1278 } else if (test->expected_result == ATTACH_REJECT || err) { 1279 goto err; 1280 } 1281 1282 switch (test->attach_type) { 1283 case BPF_CGROUP_INET4_BIND: 1284 case BPF_CGROUP_INET6_BIND: 1285 err = run_bind_test_case(test); 1286 break; 1287 case BPF_CGROUP_INET4_CONNECT: 1288 case BPF_CGROUP_INET6_CONNECT: 1289 err = run_connect_test_case(test); 1290 break; 1291 case BPF_CGROUP_UDP4_SENDMSG: 1292 case BPF_CGROUP_UDP6_SENDMSG: 1293 err = run_sendmsg_test_case(test); 1294 break; 1295 default: 1296 goto err; 1297 } 1298 1299 if (test->expected_result == SYSCALL_EPERM && err == EPERM) { 1300 err = 0; /* error was expected, reset it */ 1301 goto out; 1302 } 1303 1304 if (test->expected_result == SYSCALL_ENOTSUPP && err == ENOTSUPP) { 1305 err = 0; /* error was expected, reset it */ 1306 goto out; 1307 } 1308 1309 if (err || test->expected_result != SUCCESS) 1310 goto err; 1311 1312 goto out; 1313 err: 1314 err = -1; 1315 out: 1316 /* Detaching w/o checking return code: best effort attempt. */ 1317 if (progfd != -1) 1318 bpf_prog_detach(cgfd, test->attach_type); 1319 close(progfd); 1320 printf("[%s]\n", err ? "FAIL" : "PASS"); 1321 return err; 1322 } 1323 1324 static int run_tests(int cgfd) 1325 { 1326 int passes = 0; 1327 int fails = 0; 1328 int i; 1329 1330 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 1331 if (run_test_case(cgfd, &tests[i])) 1332 ++fails; 1333 else 1334 ++passes; 1335 } 1336 printf("Summary: %d PASSED, %d FAILED\n", passes, fails); 1337 return fails ? -1 : 0; 1338 } 1339 1340 int main(int argc, char **argv) 1341 { 1342 int cgfd = -1; 1343 int err = 0; 1344 1345 if (argc < 2) { 1346 fprintf(stderr, 1347 "%s has to be run via %s.sh. Skip direct run.\n", 1348 argv[0], argv[0]); 1349 exit(err); 1350 } 1351 1352 if (setup_cgroup_environment()) 1353 goto err; 1354 1355 cgfd = create_and_get_cgroup(CG_PATH); 1356 if (!cgfd) 1357 goto err; 1358 1359 if (join_cgroup(CG_PATH)) 1360 goto err; 1361 1362 if (run_tests(cgfd)) 1363 goto err; 1364 1365 goto out; 1366 err: 1367 err = -1; 1368 out: 1369 close(cgfd); 1370 cleanup_cgroup_environment(); 1371 return err; 1372 } 1373