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 #include "bpf_util.h" 24 25 #ifndef ENOTSUPP 26 # define ENOTSUPP 524 27 #endif 28 29 #define CG_PATH "/foo" 30 #define CONNECT4_PROG_PATH "./connect4_prog.o" 31 #define CONNECT6_PROG_PATH "./connect6_prog.o" 32 #define SENDMSG4_PROG_PATH "./sendmsg4_prog.o" 33 #define SENDMSG6_PROG_PATH "./sendmsg6_prog.o" 34 35 #define SERV4_IP "192.168.1.254" 36 #define SERV4_REWRITE_IP "127.0.0.1" 37 #define SRC4_IP "172.16.0.1" 38 #define SRC4_REWRITE_IP "127.0.0.4" 39 #define SERV4_PORT 4040 40 #define SERV4_REWRITE_PORT 4444 41 42 #define SERV6_IP "face:b00c:1234:5678::abcd" 43 #define SERV6_REWRITE_IP "::1" 44 #define SERV6_V4MAPPED_IP "::ffff:192.168.0.4" 45 #define SRC6_IP "::1" 46 #define SRC6_REWRITE_IP "::6" 47 #define SERV6_PORT 6060 48 #define SERV6_REWRITE_PORT 6666 49 50 #define INET_NTOP_BUF 40 51 52 struct sock_addr_test; 53 54 typedef int (*load_fn)(const struct sock_addr_test *test); 55 typedef int (*info_fn)(int, struct sockaddr *, socklen_t *); 56 57 char bpf_log_buf[BPF_LOG_BUF_SIZE]; 58 59 struct sock_addr_test { 60 const char *descr; 61 /* BPF prog properties */ 62 load_fn loadfn; 63 enum bpf_attach_type expected_attach_type; 64 enum bpf_attach_type attach_type; 65 /* Socket properties */ 66 int domain; 67 int type; 68 /* IP:port pairs for BPF prog to override */ 69 const char *requested_ip; 70 unsigned short requested_port; 71 const char *expected_ip; 72 unsigned short expected_port; 73 const char *expected_src_ip; 74 /* Expected test result */ 75 enum { 76 LOAD_REJECT, 77 ATTACH_REJECT, 78 SYSCALL_EPERM, 79 SYSCALL_ENOTSUPP, 80 SUCCESS, 81 } expected_result; 82 }; 83 84 static int bind4_prog_load(const struct sock_addr_test *test); 85 static int bind6_prog_load(const struct sock_addr_test *test); 86 static int connect4_prog_load(const struct sock_addr_test *test); 87 static int connect6_prog_load(const struct sock_addr_test *test); 88 static int sendmsg_deny_prog_load(const struct sock_addr_test *test); 89 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test); 90 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test); 91 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test); 92 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test); 93 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test); 94 95 static struct sock_addr_test tests[] = { 96 /* bind */ 97 { 98 "bind4: load prog with wrong expected attach type", 99 bind4_prog_load, 100 BPF_CGROUP_INET6_BIND, 101 BPF_CGROUP_INET4_BIND, 102 AF_INET, 103 SOCK_STREAM, 104 NULL, 105 0, 106 NULL, 107 0, 108 NULL, 109 LOAD_REJECT, 110 }, 111 { 112 "bind4: attach prog with wrong attach type", 113 bind4_prog_load, 114 BPF_CGROUP_INET4_BIND, 115 BPF_CGROUP_INET6_BIND, 116 AF_INET, 117 SOCK_STREAM, 118 NULL, 119 0, 120 NULL, 121 0, 122 NULL, 123 ATTACH_REJECT, 124 }, 125 { 126 "bind4: rewrite IP & TCP port in", 127 bind4_prog_load, 128 BPF_CGROUP_INET4_BIND, 129 BPF_CGROUP_INET4_BIND, 130 AF_INET, 131 SOCK_STREAM, 132 SERV4_IP, 133 SERV4_PORT, 134 SERV4_REWRITE_IP, 135 SERV4_REWRITE_PORT, 136 NULL, 137 SUCCESS, 138 }, 139 { 140 "bind4: rewrite IP & UDP port in", 141 bind4_prog_load, 142 BPF_CGROUP_INET4_BIND, 143 BPF_CGROUP_INET4_BIND, 144 AF_INET, 145 SOCK_DGRAM, 146 SERV4_IP, 147 SERV4_PORT, 148 SERV4_REWRITE_IP, 149 SERV4_REWRITE_PORT, 150 NULL, 151 SUCCESS, 152 }, 153 { 154 "bind6: load prog with wrong expected attach type", 155 bind6_prog_load, 156 BPF_CGROUP_INET4_BIND, 157 BPF_CGROUP_INET6_BIND, 158 AF_INET6, 159 SOCK_STREAM, 160 NULL, 161 0, 162 NULL, 163 0, 164 NULL, 165 LOAD_REJECT, 166 }, 167 { 168 "bind6: attach prog with wrong attach type", 169 bind6_prog_load, 170 BPF_CGROUP_INET6_BIND, 171 BPF_CGROUP_INET4_BIND, 172 AF_INET, 173 SOCK_STREAM, 174 NULL, 175 0, 176 NULL, 177 0, 178 NULL, 179 ATTACH_REJECT, 180 }, 181 { 182 "bind6: rewrite IP & TCP port in", 183 bind6_prog_load, 184 BPF_CGROUP_INET6_BIND, 185 BPF_CGROUP_INET6_BIND, 186 AF_INET6, 187 SOCK_STREAM, 188 SERV6_IP, 189 SERV6_PORT, 190 SERV6_REWRITE_IP, 191 SERV6_REWRITE_PORT, 192 NULL, 193 SUCCESS, 194 }, 195 { 196 "bind6: rewrite IP & UDP port in", 197 bind6_prog_load, 198 BPF_CGROUP_INET6_BIND, 199 BPF_CGROUP_INET6_BIND, 200 AF_INET6, 201 SOCK_DGRAM, 202 SERV6_IP, 203 SERV6_PORT, 204 SERV6_REWRITE_IP, 205 SERV6_REWRITE_PORT, 206 NULL, 207 SUCCESS, 208 }, 209 210 /* connect */ 211 { 212 "connect4: load prog with wrong expected attach type", 213 connect4_prog_load, 214 BPF_CGROUP_INET6_CONNECT, 215 BPF_CGROUP_INET4_CONNECT, 216 AF_INET, 217 SOCK_STREAM, 218 NULL, 219 0, 220 NULL, 221 0, 222 NULL, 223 LOAD_REJECT, 224 }, 225 { 226 "connect4: attach prog with wrong attach type", 227 connect4_prog_load, 228 BPF_CGROUP_INET4_CONNECT, 229 BPF_CGROUP_INET6_CONNECT, 230 AF_INET, 231 SOCK_STREAM, 232 NULL, 233 0, 234 NULL, 235 0, 236 NULL, 237 ATTACH_REJECT, 238 }, 239 { 240 "connect4: rewrite IP & TCP port", 241 connect4_prog_load, 242 BPF_CGROUP_INET4_CONNECT, 243 BPF_CGROUP_INET4_CONNECT, 244 AF_INET, 245 SOCK_STREAM, 246 SERV4_IP, 247 SERV4_PORT, 248 SERV4_REWRITE_IP, 249 SERV4_REWRITE_PORT, 250 SRC4_REWRITE_IP, 251 SUCCESS, 252 }, 253 { 254 "connect4: rewrite IP & UDP port", 255 connect4_prog_load, 256 BPF_CGROUP_INET4_CONNECT, 257 BPF_CGROUP_INET4_CONNECT, 258 AF_INET, 259 SOCK_DGRAM, 260 SERV4_IP, 261 SERV4_PORT, 262 SERV4_REWRITE_IP, 263 SERV4_REWRITE_PORT, 264 SRC4_REWRITE_IP, 265 SUCCESS, 266 }, 267 { 268 "connect6: load prog with wrong expected attach type", 269 connect6_prog_load, 270 BPF_CGROUP_INET4_CONNECT, 271 BPF_CGROUP_INET6_CONNECT, 272 AF_INET6, 273 SOCK_STREAM, 274 NULL, 275 0, 276 NULL, 277 0, 278 NULL, 279 LOAD_REJECT, 280 }, 281 { 282 "connect6: attach prog with wrong attach type", 283 connect6_prog_load, 284 BPF_CGROUP_INET6_CONNECT, 285 BPF_CGROUP_INET4_CONNECT, 286 AF_INET, 287 SOCK_STREAM, 288 NULL, 289 0, 290 NULL, 291 0, 292 NULL, 293 ATTACH_REJECT, 294 }, 295 { 296 "connect6: rewrite IP & TCP port", 297 connect6_prog_load, 298 BPF_CGROUP_INET6_CONNECT, 299 BPF_CGROUP_INET6_CONNECT, 300 AF_INET6, 301 SOCK_STREAM, 302 SERV6_IP, 303 SERV6_PORT, 304 SERV6_REWRITE_IP, 305 SERV6_REWRITE_PORT, 306 SRC6_REWRITE_IP, 307 SUCCESS, 308 }, 309 { 310 "connect6: rewrite IP & UDP port", 311 connect6_prog_load, 312 BPF_CGROUP_INET6_CONNECT, 313 BPF_CGROUP_INET6_CONNECT, 314 AF_INET6, 315 SOCK_DGRAM, 316 SERV6_IP, 317 SERV6_PORT, 318 SERV6_REWRITE_IP, 319 SERV6_REWRITE_PORT, 320 SRC6_REWRITE_IP, 321 SUCCESS, 322 }, 323 324 /* sendmsg */ 325 { 326 "sendmsg4: load prog with wrong expected attach type", 327 sendmsg4_rw_asm_prog_load, 328 BPF_CGROUP_UDP6_SENDMSG, 329 BPF_CGROUP_UDP4_SENDMSG, 330 AF_INET, 331 SOCK_DGRAM, 332 NULL, 333 0, 334 NULL, 335 0, 336 NULL, 337 LOAD_REJECT, 338 }, 339 { 340 "sendmsg4: attach prog with wrong attach type", 341 sendmsg4_rw_asm_prog_load, 342 BPF_CGROUP_UDP4_SENDMSG, 343 BPF_CGROUP_UDP6_SENDMSG, 344 AF_INET, 345 SOCK_DGRAM, 346 NULL, 347 0, 348 NULL, 349 0, 350 NULL, 351 ATTACH_REJECT, 352 }, 353 { 354 "sendmsg4: rewrite IP & port (asm)", 355 sendmsg4_rw_asm_prog_load, 356 BPF_CGROUP_UDP4_SENDMSG, 357 BPF_CGROUP_UDP4_SENDMSG, 358 AF_INET, 359 SOCK_DGRAM, 360 SERV4_IP, 361 SERV4_PORT, 362 SERV4_REWRITE_IP, 363 SERV4_REWRITE_PORT, 364 SRC4_REWRITE_IP, 365 SUCCESS, 366 }, 367 { 368 "sendmsg4: rewrite IP & port (C)", 369 sendmsg4_rw_c_prog_load, 370 BPF_CGROUP_UDP4_SENDMSG, 371 BPF_CGROUP_UDP4_SENDMSG, 372 AF_INET, 373 SOCK_DGRAM, 374 SERV4_IP, 375 SERV4_PORT, 376 SERV4_REWRITE_IP, 377 SERV4_REWRITE_PORT, 378 SRC4_REWRITE_IP, 379 SUCCESS, 380 }, 381 { 382 "sendmsg4: deny call", 383 sendmsg_deny_prog_load, 384 BPF_CGROUP_UDP4_SENDMSG, 385 BPF_CGROUP_UDP4_SENDMSG, 386 AF_INET, 387 SOCK_DGRAM, 388 SERV4_IP, 389 SERV4_PORT, 390 SERV4_REWRITE_IP, 391 SERV4_REWRITE_PORT, 392 SRC4_REWRITE_IP, 393 SYSCALL_EPERM, 394 }, 395 { 396 "sendmsg6: load prog with wrong expected attach type", 397 sendmsg6_rw_asm_prog_load, 398 BPF_CGROUP_UDP4_SENDMSG, 399 BPF_CGROUP_UDP6_SENDMSG, 400 AF_INET6, 401 SOCK_DGRAM, 402 NULL, 403 0, 404 NULL, 405 0, 406 NULL, 407 LOAD_REJECT, 408 }, 409 { 410 "sendmsg6: attach prog with wrong attach type", 411 sendmsg6_rw_asm_prog_load, 412 BPF_CGROUP_UDP6_SENDMSG, 413 BPF_CGROUP_UDP4_SENDMSG, 414 AF_INET6, 415 SOCK_DGRAM, 416 NULL, 417 0, 418 NULL, 419 0, 420 NULL, 421 ATTACH_REJECT, 422 }, 423 { 424 "sendmsg6: rewrite IP & port (asm)", 425 sendmsg6_rw_asm_prog_load, 426 BPF_CGROUP_UDP6_SENDMSG, 427 BPF_CGROUP_UDP6_SENDMSG, 428 AF_INET6, 429 SOCK_DGRAM, 430 SERV6_IP, 431 SERV6_PORT, 432 SERV6_REWRITE_IP, 433 SERV6_REWRITE_PORT, 434 SRC6_REWRITE_IP, 435 SUCCESS, 436 }, 437 { 438 "sendmsg6: rewrite IP & port (C)", 439 sendmsg6_rw_c_prog_load, 440 BPF_CGROUP_UDP6_SENDMSG, 441 BPF_CGROUP_UDP6_SENDMSG, 442 AF_INET6, 443 SOCK_DGRAM, 444 SERV6_IP, 445 SERV6_PORT, 446 SERV6_REWRITE_IP, 447 SERV6_REWRITE_PORT, 448 SRC6_REWRITE_IP, 449 SUCCESS, 450 }, 451 { 452 "sendmsg6: IPv4-mapped IPv6", 453 sendmsg6_rw_v4mapped_prog_load, 454 BPF_CGROUP_UDP6_SENDMSG, 455 BPF_CGROUP_UDP6_SENDMSG, 456 AF_INET6, 457 SOCK_DGRAM, 458 SERV6_IP, 459 SERV6_PORT, 460 SERV6_REWRITE_IP, 461 SERV6_REWRITE_PORT, 462 SRC6_REWRITE_IP, 463 SYSCALL_ENOTSUPP, 464 }, 465 { 466 "sendmsg6: deny call", 467 sendmsg_deny_prog_load, 468 BPF_CGROUP_UDP6_SENDMSG, 469 BPF_CGROUP_UDP6_SENDMSG, 470 AF_INET6, 471 SOCK_DGRAM, 472 SERV6_IP, 473 SERV6_PORT, 474 SERV6_REWRITE_IP, 475 SERV6_REWRITE_PORT, 476 SRC6_REWRITE_IP, 477 SYSCALL_EPERM, 478 }, 479 }; 480 481 static int mk_sockaddr(int domain, const char *ip, unsigned short port, 482 struct sockaddr *addr, socklen_t addr_len) 483 { 484 struct sockaddr_in6 *addr6; 485 struct sockaddr_in *addr4; 486 487 if (domain != AF_INET && domain != AF_INET6) { 488 log_err("Unsupported address family"); 489 return -1; 490 } 491 492 memset(addr, 0, addr_len); 493 494 if (domain == AF_INET) { 495 if (addr_len < sizeof(struct sockaddr_in)) 496 return -1; 497 addr4 = (struct sockaddr_in *)addr; 498 addr4->sin_family = domain; 499 addr4->sin_port = htons(port); 500 if (inet_pton(domain, ip, (void *)&addr4->sin_addr) != 1) { 501 log_err("Invalid IPv4: %s", ip); 502 return -1; 503 } 504 } else if (domain == AF_INET6) { 505 if (addr_len < sizeof(struct sockaddr_in6)) 506 return -1; 507 addr6 = (struct sockaddr_in6 *)addr; 508 addr6->sin6_family = domain; 509 addr6->sin6_port = htons(port); 510 if (inet_pton(domain, ip, (void *)&addr6->sin6_addr) != 1) { 511 log_err("Invalid IPv6: %s", ip); 512 return -1; 513 } 514 } 515 516 return 0; 517 } 518 519 static int load_insns(const struct sock_addr_test *test, 520 const struct bpf_insn *insns, size_t insns_cnt) 521 { 522 struct bpf_load_program_attr load_attr; 523 int ret; 524 525 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 526 load_attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; 527 load_attr.expected_attach_type = test->expected_attach_type; 528 load_attr.insns = insns; 529 load_attr.insns_cnt = insns_cnt; 530 load_attr.license = "GPL"; 531 532 ret = bpf_load_program_xattr(&load_attr, bpf_log_buf, BPF_LOG_BUF_SIZE); 533 if (ret < 0 && test->expected_result != LOAD_REJECT) { 534 log_err(">>> Loading program error.\n" 535 ">>> Verifier output:\n%s\n-------\n", bpf_log_buf); 536 } 537 538 return ret; 539 } 540 541 /* [1] These testing programs try to read different context fields, including 542 * narrow loads of different sizes from user_ip4 and user_ip6, and write to 543 * those allowed to be overridden. 544 * 545 * [2] BPF_LD_IMM64 & BPF_JMP_REG are used below whenever there is a need to 546 * compare a register with unsigned 32bit integer. BPF_JMP_IMM can't be used 547 * in such cases since it accepts only _signed_ 32bit integer as IMM 548 * argument. Also note that BPF_LD_IMM64 contains 2 instructions what matters 549 * to count jumps properly. 550 */ 551 552 static int bind4_prog_load(const struct sock_addr_test *test) 553 { 554 union { 555 uint8_t u4_addr8[4]; 556 uint16_t u4_addr16[2]; 557 uint32_t u4_addr32; 558 } ip4; 559 struct sockaddr_in addr4_rw; 560 561 if (inet_pton(AF_INET, SERV4_IP, (void *)&ip4) != 1) { 562 log_err("Invalid IPv4: %s", SERV4_IP); 563 return -1; 564 } 565 566 if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT, 567 (struct sockaddr *)&addr4_rw, sizeof(addr4_rw)) == -1) 568 return -1; 569 570 /* See [1]. */ 571 struct bpf_insn insns[] = { 572 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 573 574 /* if (sk.family == AF_INET && */ 575 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 576 offsetof(struct bpf_sock_addr, family)), 577 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 16), 578 579 /* (sk.type == SOCK_DGRAM || sk.type == SOCK_STREAM) && */ 580 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 581 offsetof(struct bpf_sock_addr, type)), 582 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 1), 583 BPF_JMP_A(1), 584 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_STREAM, 12), 585 586 /* 1st_byte_of_user_ip4 == expected && */ 587 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6, 588 offsetof(struct bpf_sock_addr, user_ip4)), 589 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[0], 10), 590 591 /* 1st_half_of_user_ip4 == expected && */ 592 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6, 593 offsetof(struct bpf_sock_addr, user_ip4)), 594 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[0], 8), 595 596 /* whole_user_ip4 == expected) { */ 597 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 598 offsetof(struct bpf_sock_addr, user_ip4)), 599 BPF_LD_IMM64(BPF_REG_8, ip4.u4_addr32), /* See [2]. */ 600 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 4), 601 602 /* user_ip4 = addr4_rw.sin_addr */ 603 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_addr.s_addr), 604 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 605 offsetof(struct bpf_sock_addr, user_ip4)), 606 607 /* user_port = addr4_rw.sin_port */ 608 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_port), 609 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 610 offsetof(struct bpf_sock_addr, user_port)), 611 /* } */ 612 613 /* return 1 */ 614 BPF_MOV64_IMM(BPF_REG_0, 1), 615 BPF_EXIT_INSN(), 616 }; 617 618 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 619 } 620 621 static int bind6_prog_load(const struct sock_addr_test *test) 622 { 623 struct sockaddr_in6 addr6_rw; 624 struct in6_addr ip6; 625 626 if (inet_pton(AF_INET6, SERV6_IP, (void *)&ip6) != 1) { 627 log_err("Invalid IPv6: %s", SERV6_IP); 628 return -1; 629 } 630 631 if (mk_sockaddr(AF_INET6, SERV6_REWRITE_IP, SERV6_REWRITE_PORT, 632 (struct sockaddr *)&addr6_rw, sizeof(addr6_rw)) == -1) 633 return -1; 634 635 /* See [1]. */ 636 struct bpf_insn insns[] = { 637 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 638 639 /* if (sk.family == AF_INET6 && */ 640 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 641 offsetof(struct bpf_sock_addr, family)), 642 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18), 643 644 /* 5th_byte_of_user_ip6 == expected && */ 645 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6, 646 offsetof(struct bpf_sock_addr, user_ip6[1])), 647 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr[4], 16), 648 649 /* 3rd_half_of_user_ip6 == expected && */ 650 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6, 651 offsetof(struct bpf_sock_addr, user_ip6[1])), 652 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr16[2], 14), 653 654 /* last_word_of_user_ip6 == expected) { */ 655 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 656 offsetof(struct bpf_sock_addr, user_ip6[3])), 657 BPF_LD_IMM64(BPF_REG_8, ip6.s6_addr32[3]), /* See [2]. */ 658 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 10), 659 660 661 #define STORE_IPV6_WORD(N) \ 662 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_addr.s6_addr32[N]), \ 663 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, \ 664 offsetof(struct bpf_sock_addr, user_ip6[N])) 665 666 /* user_ip6 = addr6_rw.sin6_addr */ 667 STORE_IPV6_WORD(0), 668 STORE_IPV6_WORD(1), 669 STORE_IPV6_WORD(2), 670 STORE_IPV6_WORD(3), 671 672 /* user_port = addr6_rw.sin6_port */ 673 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_port), 674 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 675 offsetof(struct bpf_sock_addr, user_port)), 676 677 /* } */ 678 679 /* return 1 */ 680 BPF_MOV64_IMM(BPF_REG_0, 1), 681 BPF_EXIT_INSN(), 682 }; 683 684 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 685 } 686 687 static int load_path(const struct sock_addr_test *test, const char *path) 688 { 689 struct bpf_prog_load_attr attr; 690 struct bpf_object *obj; 691 int prog_fd; 692 693 memset(&attr, 0, sizeof(struct bpf_prog_load_attr)); 694 attr.file = path; 695 attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR; 696 attr.expected_attach_type = test->expected_attach_type; 697 698 if (bpf_prog_load_xattr(&attr, &obj, &prog_fd)) { 699 if (test->expected_result != LOAD_REJECT) 700 log_err(">>> Loading program (%s) error.\n", path); 701 return -1; 702 } 703 704 return prog_fd; 705 } 706 707 static int connect4_prog_load(const struct sock_addr_test *test) 708 { 709 return load_path(test, CONNECT4_PROG_PATH); 710 } 711 712 static int connect6_prog_load(const struct sock_addr_test *test) 713 { 714 return load_path(test, CONNECT6_PROG_PATH); 715 } 716 717 static int sendmsg_deny_prog_load(const struct sock_addr_test *test) 718 { 719 struct bpf_insn insns[] = { 720 /* return 0 */ 721 BPF_MOV64_IMM(BPF_REG_0, 0), 722 BPF_EXIT_INSN(), 723 }; 724 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 725 } 726 727 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test) 728 { 729 struct sockaddr_in dst4_rw_addr; 730 struct in_addr src4_rw_ip; 731 732 if (inet_pton(AF_INET, SRC4_REWRITE_IP, (void *)&src4_rw_ip) != 1) { 733 log_err("Invalid IPv4: %s", SRC4_REWRITE_IP); 734 return -1; 735 } 736 737 if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT, 738 (struct sockaddr *)&dst4_rw_addr, 739 sizeof(dst4_rw_addr)) == -1) 740 return -1; 741 742 struct bpf_insn insns[] = { 743 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 744 745 /* if (sk.family == AF_INET && */ 746 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 747 offsetof(struct bpf_sock_addr, family)), 748 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 8), 749 750 /* sk.type == SOCK_DGRAM) { */ 751 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 752 offsetof(struct bpf_sock_addr, type)), 753 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 6), 754 755 /* msg_src_ip4 = src4_rw_ip */ 756 BPF_MOV32_IMM(BPF_REG_7, src4_rw_ip.s_addr), 757 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 758 offsetof(struct bpf_sock_addr, msg_src_ip4)), 759 760 /* user_ip4 = dst4_rw_addr.sin_addr */ 761 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_addr.s_addr), 762 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 763 offsetof(struct bpf_sock_addr, user_ip4)), 764 765 /* user_port = dst4_rw_addr.sin_port */ 766 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_port), 767 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 768 offsetof(struct bpf_sock_addr, user_port)), 769 /* } */ 770 771 /* return 1 */ 772 BPF_MOV64_IMM(BPF_REG_0, 1), 773 BPF_EXIT_INSN(), 774 }; 775 776 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 777 } 778 779 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test) 780 { 781 return load_path(test, SENDMSG4_PROG_PATH); 782 } 783 784 static int sendmsg6_rw_dst_asm_prog_load(const struct sock_addr_test *test, 785 const char *rw_dst_ip) 786 { 787 struct sockaddr_in6 dst6_rw_addr; 788 struct in6_addr src6_rw_ip; 789 790 if (inet_pton(AF_INET6, SRC6_REWRITE_IP, (void *)&src6_rw_ip) != 1) { 791 log_err("Invalid IPv6: %s", SRC6_REWRITE_IP); 792 return -1; 793 } 794 795 if (mk_sockaddr(AF_INET6, rw_dst_ip, SERV6_REWRITE_PORT, 796 (struct sockaddr *)&dst6_rw_addr, 797 sizeof(dst6_rw_addr)) == -1) 798 return -1; 799 800 struct bpf_insn insns[] = { 801 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), 802 803 /* if (sk.family == AF_INET6) { */ 804 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6, 805 offsetof(struct bpf_sock_addr, family)), 806 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18), 807 808 #define STORE_IPV6_WORD_N(DST, SRC, N) \ 809 BPF_MOV32_IMM(BPF_REG_7, SRC[N]), \ 810 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, \ 811 offsetof(struct bpf_sock_addr, DST[N])) 812 813 #define STORE_IPV6(DST, SRC) \ 814 STORE_IPV6_WORD_N(DST, SRC, 0), \ 815 STORE_IPV6_WORD_N(DST, SRC, 1), \ 816 STORE_IPV6_WORD_N(DST, SRC, 2), \ 817 STORE_IPV6_WORD_N(DST, SRC, 3) 818 819 STORE_IPV6(msg_src_ip6, src6_rw_ip.s6_addr32), 820 STORE_IPV6(user_ip6, dst6_rw_addr.sin6_addr.s6_addr32), 821 822 /* user_port = dst6_rw_addr.sin6_port */ 823 BPF_MOV32_IMM(BPF_REG_7, dst6_rw_addr.sin6_port), 824 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7, 825 offsetof(struct bpf_sock_addr, user_port)), 826 827 /* } */ 828 829 /* return 1 */ 830 BPF_MOV64_IMM(BPF_REG_0, 1), 831 BPF_EXIT_INSN(), 832 }; 833 834 return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn)); 835 } 836 837 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test) 838 { 839 return sendmsg6_rw_dst_asm_prog_load(test, SERV6_REWRITE_IP); 840 } 841 842 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test) 843 { 844 return sendmsg6_rw_dst_asm_prog_load(test, SERV6_V4MAPPED_IP); 845 } 846 847 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test) 848 { 849 return load_path(test, SENDMSG6_PROG_PATH); 850 } 851 852 static int cmp_addr(const struct sockaddr_storage *addr1, 853 const struct sockaddr_storage *addr2, int cmp_port) 854 { 855 const struct sockaddr_in *four1, *four2; 856 const struct sockaddr_in6 *six1, *six2; 857 858 if (addr1->ss_family != addr2->ss_family) 859 return -1; 860 861 if (addr1->ss_family == AF_INET) { 862 four1 = (const struct sockaddr_in *)addr1; 863 four2 = (const struct sockaddr_in *)addr2; 864 return !((four1->sin_port == four2->sin_port || !cmp_port) && 865 four1->sin_addr.s_addr == four2->sin_addr.s_addr); 866 } else if (addr1->ss_family == AF_INET6) { 867 six1 = (const struct sockaddr_in6 *)addr1; 868 six2 = (const struct sockaddr_in6 *)addr2; 869 return !((six1->sin6_port == six2->sin6_port || !cmp_port) && 870 !memcmp(&six1->sin6_addr, &six2->sin6_addr, 871 sizeof(struct in6_addr))); 872 } 873 874 return -1; 875 } 876 877 static int cmp_sock_addr(info_fn fn, int sock1, 878 const struct sockaddr_storage *addr2, int cmp_port) 879 { 880 struct sockaddr_storage addr1; 881 socklen_t len1 = sizeof(addr1); 882 883 memset(&addr1, 0, len1); 884 if (fn(sock1, (struct sockaddr *)&addr1, (socklen_t *)&len1) != 0) 885 return -1; 886 887 return cmp_addr(&addr1, addr2, cmp_port); 888 } 889 890 static int cmp_local_ip(int sock1, const struct sockaddr_storage *addr2) 891 { 892 return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 0); 893 } 894 895 static int cmp_local_addr(int sock1, const struct sockaddr_storage *addr2) 896 { 897 return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 1); 898 } 899 900 static int cmp_peer_addr(int sock1, const struct sockaddr_storage *addr2) 901 { 902 return cmp_sock_addr(getpeername, sock1, addr2, /*cmp_port*/ 1); 903 } 904 905 static int start_server(int type, const struct sockaddr_storage *addr, 906 socklen_t addr_len) 907 { 908 int fd; 909 910 fd = socket(addr->ss_family, type, 0); 911 if (fd == -1) { 912 log_err("Failed to create server socket"); 913 goto out; 914 } 915 916 if (bind(fd, (const struct sockaddr *)addr, addr_len) == -1) { 917 log_err("Failed to bind server socket"); 918 goto close_out; 919 } 920 921 if (type == SOCK_STREAM) { 922 if (listen(fd, 128) == -1) { 923 log_err("Failed to listen on server socket"); 924 goto close_out; 925 } 926 } 927 928 goto out; 929 close_out: 930 close(fd); 931 fd = -1; 932 out: 933 return fd; 934 } 935 936 static int connect_to_server(int type, const struct sockaddr_storage *addr, 937 socklen_t addr_len) 938 { 939 int domain; 940 int fd = -1; 941 942 domain = addr->ss_family; 943 944 if (domain != AF_INET && domain != AF_INET6) { 945 log_err("Unsupported address family"); 946 goto err; 947 } 948 949 fd = socket(domain, type, 0); 950 if (fd == -1) { 951 log_err("Failed to create client socket"); 952 goto err; 953 } 954 955 if (connect(fd, (const struct sockaddr *)addr, addr_len) == -1) { 956 log_err("Fail to connect to server"); 957 goto err; 958 } 959 960 goto out; 961 err: 962 close(fd); 963 fd = -1; 964 out: 965 return fd; 966 } 967 968 int init_pktinfo(int domain, struct cmsghdr *cmsg) 969 { 970 struct in6_pktinfo *pktinfo6; 971 struct in_pktinfo *pktinfo4; 972 973 if (domain == AF_INET) { 974 cmsg->cmsg_level = SOL_IP; 975 cmsg->cmsg_type = IP_PKTINFO; 976 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); 977 pktinfo4 = (struct in_pktinfo *)CMSG_DATA(cmsg); 978 memset(pktinfo4, 0, sizeof(struct in_pktinfo)); 979 if (inet_pton(domain, SRC4_IP, 980 (void *)&pktinfo4->ipi_spec_dst) != 1) 981 return -1; 982 } else if (domain == AF_INET6) { 983 cmsg->cmsg_level = SOL_IPV6; 984 cmsg->cmsg_type = IPV6_PKTINFO; 985 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 986 pktinfo6 = (struct in6_pktinfo *)CMSG_DATA(cmsg); 987 memset(pktinfo6, 0, sizeof(struct in6_pktinfo)); 988 if (inet_pton(domain, SRC6_IP, 989 (void *)&pktinfo6->ipi6_addr) != 1) 990 return -1; 991 } else { 992 return -1; 993 } 994 995 return 0; 996 } 997 998 static int sendmsg_to_server(int type, const struct sockaddr_storage *addr, 999 socklen_t addr_len, int set_cmsg, int flags, 1000 int *syscall_err) 1001 { 1002 union { 1003 char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))]; 1004 struct cmsghdr align; 1005 } control6; 1006 union { 1007 char buf[CMSG_SPACE(sizeof(struct in_pktinfo))]; 1008 struct cmsghdr align; 1009 } control4; 1010 struct msghdr hdr; 1011 struct iovec iov; 1012 char data = 'a'; 1013 int domain; 1014 int fd = -1; 1015 1016 domain = addr->ss_family; 1017 1018 if (domain != AF_INET && domain != AF_INET6) { 1019 log_err("Unsupported address family"); 1020 goto err; 1021 } 1022 1023 fd = socket(domain, type, 0); 1024 if (fd == -1) { 1025 log_err("Failed to create client socket"); 1026 goto err; 1027 } 1028 1029 memset(&iov, 0, sizeof(iov)); 1030 iov.iov_base = &data; 1031 iov.iov_len = sizeof(data); 1032 1033 memset(&hdr, 0, sizeof(hdr)); 1034 hdr.msg_name = (void *)addr; 1035 hdr.msg_namelen = addr_len; 1036 hdr.msg_iov = &iov; 1037 hdr.msg_iovlen = 1; 1038 1039 if (set_cmsg) { 1040 if (domain == AF_INET) { 1041 hdr.msg_control = &control4; 1042 hdr.msg_controllen = sizeof(control4.buf); 1043 } else if (domain == AF_INET6) { 1044 hdr.msg_control = &control6; 1045 hdr.msg_controllen = sizeof(control6.buf); 1046 } 1047 if (init_pktinfo(domain, CMSG_FIRSTHDR(&hdr))) { 1048 log_err("Fail to init pktinfo"); 1049 goto err; 1050 } 1051 } 1052 1053 if (sendmsg(fd, &hdr, flags) != sizeof(data)) { 1054 log_err("Fail to send message to server"); 1055 *syscall_err = errno; 1056 goto err; 1057 } 1058 1059 goto out; 1060 err: 1061 close(fd); 1062 fd = -1; 1063 out: 1064 return fd; 1065 } 1066 1067 static int fastconnect_to_server(const struct sockaddr_storage *addr, 1068 socklen_t addr_len) 1069 { 1070 int sendmsg_err; 1071 1072 return sendmsg_to_server(SOCK_STREAM, addr, addr_len, /*set_cmsg*/0, 1073 MSG_FASTOPEN, &sendmsg_err); 1074 } 1075 1076 static int recvmsg_from_client(int sockfd, struct sockaddr_storage *src_addr) 1077 { 1078 struct timeval tv; 1079 struct msghdr hdr; 1080 struct iovec iov; 1081 char data[64]; 1082 fd_set rfds; 1083 1084 FD_ZERO(&rfds); 1085 FD_SET(sockfd, &rfds); 1086 1087 tv.tv_sec = 2; 1088 tv.tv_usec = 0; 1089 1090 if (select(sockfd + 1, &rfds, NULL, NULL, &tv) <= 0 || 1091 !FD_ISSET(sockfd, &rfds)) 1092 return -1; 1093 1094 memset(&iov, 0, sizeof(iov)); 1095 iov.iov_base = data; 1096 iov.iov_len = sizeof(data); 1097 1098 memset(&hdr, 0, sizeof(hdr)); 1099 hdr.msg_name = src_addr; 1100 hdr.msg_namelen = sizeof(struct sockaddr_storage); 1101 hdr.msg_iov = &iov; 1102 hdr.msg_iovlen = 1; 1103 1104 return recvmsg(sockfd, &hdr, 0); 1105 } 1106 1107 static int init_addrs(const struct sock_addr_test *test, 1108 struct sockaddr_storage *requested_addr, 1109 struct sockaddr_storage *expected_addr, 1110 struct sockaddr_storage *expected_src_addr) 1111 { 1112 socklen_t addr_len = sizeof(struct sockaddr_storage); 1113 1114 if (mk_sockaddr(test->domain, test->expected_ip, test->expected_port, 1115 (struct sockaddr *)expected_addr, addr_len) == -1) 1116 goto err; 1117 1118 if (mk_sockaddr(test->domain, test->requested_ip, test->requested_port, 1119 (struct sockaddr *)requested_addr, addr_len) == -1) 1120 goto err; 1121 1122 if (test->expected_src_ip && 1123 mk_sockaddr(test->domain, test->expected_src_ip, 0, 1124 (struct sockaddr *)expected_src_addr, addr_len) == -1) 1125 goto err; 1126 1127 return 0; 1128 err: 1129 return -1; 1130 } 1131 1132 static int run_bind_test_case(const struct sock_addr_test *test) 1133 { 1134 socklen_t addr_len = sizeof(struct sockaddr_storage); 1135 struct sockaddr_storage requested_addr; 1136 struct sockaddr_storage expected_addr; 1137 int clientfd = -1; 1138 int servfd = -1; 1139 int err = 0; 1140 1141 if (init_addrs(test, &requested_addr, &expected_addr, NULL)) 1142 goto err; 1143 1144 servfd = start_server(test->type, &requested_addr, addr_len); 1145 if (servfd == -1) 1146 goto err; 1147 1148 if (cmp_local_addr(servfd, &expected_addr)) 1149 goto err; 1150 1151 /* Try to connect to server just in case */ 1152 clientfd = connect_to_server(test->type, &expected_addr, addr_len); 1153 if (clientfd == -1) 1154 goto err; 1155 1156 goto out; 1157 err: 1158 err = -1; 1159 out: 1160 close(clientfd); 1161 close(servfd); 1162 return err; 1163 } 1164 1165 static int run_connect_test_case(const struct sock_addr_test *test) 1166 { 1167 socklen_t addr_len = sizeof(struct sockaddr_storage); 1168 struct sockaddr_storage expected_src_addr; 1169 struct sockaddr_storage requested_addr; 1170 struct sockaddr_storage expected_addr; 1171 int clientfd = -1; 1172 int servfd = -1; 1173 int err = 0; 1174 1175 if (init_addrs(test, &requested_addr, &expected_addr, 1176 &expected_src_addr)) 1177 goto err; 1178 1179 /* Prepare server to connect to */ 1180 servfd = start_server(test->type, &expected_addr, addr_len); 1181 if (servfd == -1) 1182 goto err; 1183 1184 clientfd = connect_to_server(test->type, &requested_addr, addr_len); 1185 if (clientfd == -1) 1186 goto err; 1187 1188 /* Make sure src and dst addrs were overridden properly */ 1189 if (cmp_peer_addr(clientfd, &expected_addr)) 1190 goto err; 1191 1192 if (cmp_local_ip(clientfd, &expected_src_addr)) 1193 goto err; 1194 1195 if (test->type == SOCK_STREAM) { 1196 /* Test TCP Fast Open scenario */ 1197 clientfd = fastconnect_to_server(&requested_addr, addr_len); 1198 if (clientfd == -1) 1199 goto err; 1200 1201 /* Make sure src and dst addrs were overridden properly */ 1202 if (cmp_peer_addr(clientfd, &expected_addr)) 1203 goto err; 1204 1205 if (cmp_local_ip(clientfd, &expected_src_addr)) 1206 goto err; 1207 } 1208 1209 goto out; 1210 err: 1211 err = -1; 1212 out: 1213 close(clientfd); 1214 close(servfd); 1215 return err; 1216 } 1217 1218 static int run_sendmsg_test_case(const struct sock_addr_test *test) 1219 { 1220 socklen_t addr_len = sizeof(struct sockaddr_storage); 1221 struct sockaddr_storage expected_src_addr; 1222 struct sockaddr_storage requested_addr; 1223 struct sockaddr_storage expected_addr; 1224 struct sockaddr_storage real_src_addr; 1225 int clientfd = -1; 1226 int servfd = -1; 1227 int set_cmsg; 1228 int err = 0; 1229 1230 if (test->type != SOCK_DGRAM) 1231 goto err; 1232 1233 if (init_addrs(test, &requested_addr, &expected_addr, 1234 &expected_src_addr)) 1235 goto err; 1236 1237 /* Prepare server to sendmsg to */ 1238 servfd = start_server(test->type, &expected_addr, addr_len); 1239 if (servfd == -1) 1240 goto err; 1241 1242 for (set_cmsg = 0; set_cmsg <= 1; ++set_cmsg) { 1243 if (clientfd >= 0) 1244 close(clientfd); 1245 1246 clientfd = sendmsg_to_server(test->type, &requested_addr, 1247 addr_len, set_cmsg, /*flags*/0, 1248 &err); 1249 if (err) 1250 goto out; 1251 else if (clientfd == -1) 1252 goto err; 1253 1254 /* Try to receive message on server instead of using 1255 * getpeername(2) on client socket, to check that client's 1256 * destination address was rewritten properly, since 1257 * getpeername(2) doesn't work with unconnected datagram 1258 * sockets. 1259 * 1260 * Get source address from recvmsg(2) as well to make sure 1261 * source was rewritten properly: getsockname(2) can't be used 1262 * since socket is unconnected and source defined for one 1263 * specific packet may differ from the one used by default and 1264 * returned by getsockname(2). 1265 */ 1266 if (recvmsg_from_client(servfd, &real_src_addr) == -1) 1267 goto err; 1268 1269 if (cmp_addr(&real_src_addr, &expected_src_addr, /*cmp_port*/0)) 1270 goto err; 1271 } 1272 1273 goto out; 1274 err: 1275 err = -1; 1276 out: 1277 close(clientfd); 1278 close(servfd); 1279 return err; 1280 } 1281 1282 static int run_test_case(int cgfd, const struct sock_addr_test *test) 1283 { 1284 int progfd = -1; 1285 int err = 0; 1286 1287 printf("Test case: %s .. ", test->descr); 1288 1289 progfd = test->loadfn(test); 1290 if (test->expected_result == LOAD_REJECT && progfd < 0) 1291 goto out; 1292 else if (test->expected_result == LOAD_REJECT || progfd < 0) 1293 goto err; 1294 1295 err = bpf_prog_attach(progfd, cgfd, test->attach_type, 1296 BPF_F_ALLOW_OVERRIDE); 1297 if (test->expected_result == ATTACH_REJECT && err) { 1298 err = 0; /* error was expected, reset it */ 1299 goto out; 1300 } else if (test->expected_result == ATTACH_REJECT || err) { 1301 goto err; 1302 } 1303 1304 switch (test->attach_type) { 1305 case BPF_CGROUP_INET4_BIND: 1306 case BPF_CGROUP_INET6_BIND: 1307 err = run_bind_test_case(test); 1308 break; 1309 case BPF_CGROUP_INET4_CONNECT: 1310 case BPF_CGROUP_INET6_CONNECT: 1311 err = run_connect_test_case(test); 1312 break; 1313 case BPF_CGROUP_UDP4_SENDMSG: 1314 case BPF_CGROUP_UDP6_SENDMSG: 1315 err = run_sendmsg_test_case(test); 1316 break; 1317 default: 1318 goto err; 1319 } 1320 1321 if (test->expected_result == SYSCALL_EPERM && err == EPERM) { 1322 err = 0; /* error was expected, reset it */ 1323 goto out; 1324 } 1325 1326 if (test->expected_result == SYSCALL_ENOTSUPP && err == ENOTSUPP) { 1327 err = 0; /* error was expected, reset it */ 1328 goto out; 1329 } 1330 1331 if (err || test->expected_result != SUCCESS) 1332 goto err; 1333 1334 goto out; 1335 err: 1336 err = -1; 1337 out: 1338 /* Detaching w/o checking return code: best effort attempt. */ 1339 if (progfd != -1) 1340 bpf_prog_detach(cgfd, test->attach_type); 1341 close(progfd); 1342 printf("[%s]\n", err ? "FAIL" : "PASS"); 1343 return err; 1344 } 1345 1346 static int run_tests(int cgfd) 1347 { 1348 int passes = 0; 1349 int fails = 0; 1350 int i; 1351 1352 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 1353 if (run_test_case(cgfd, &tests[i])) 1354 ++fails; 1355 else 1356 ++passes; 1357 } 1358 printf("Summary: %d PASSED, %d FAILED\n", passes, fails); 1359 return fails ? -1 : 0; 1360 } 1361 1362 int main(int argc, char **argv) 1363 { 1364 int cgfd = -1; 1365 int err = 0; 1366 1367 if (argc < 2) { 1368 fprintf(stderr, 1369 "%s has to be run via %s.sh. Skip direct run.\n", 1370 argv[0], argv[0]); 1371 exit(err); 1372 } 1373 1374 if (setup_cgroup_environment()) 1375 goto err; 1376 1377 cgfd = create_and_get_cgroup(CG_PATH); 1378 if (!cgfd) 1379 goto err; 1380 1381 if (join_cgroup(CG_PATH)) 1382 goto err; 1383 1384 if (run_tests(cgfd)) 1385 goto err; 1386 1387 goto out; 1388 err: 1389 err = -1; 1390 out: 1391 close(cgfd); 1392 cleanup_cgroup_environment(); 1393 return err; 1394 } 1395