tools/testing/selftests/bpf/test_sock_addr.c

   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 WILDCARD6_IP            "::"
  48 #define SERV6_PORT              6060
  49 #define SERV6_REWRITE_PORT      6666
  50
  51 #define INET_NTOP_BUF   40
  52
  53 struct sock_addr_test;
  54
  55 typedef int (*load_fn)(const struct sock_addr_test *test);
  56 typedef int (*info_fn)(int, struct sockaddr *, socklen_t *);
  57
  58 char bpf_log_buf[BPF_LOG_BUF_SIZE];
  59
  60 struct sock_addr_test {
  61         const char *descr;
  62         /* BPF prog properties */
  63         load_fn loadfn;
  64         enum bpf_attach_type expected_attach_type;
  65         enum bpf_attach_type attach_type;
  66         /* Socket properties */
  67         int domain;
  68         int type;
  69         /* IP:port pairs for BPF prog to override */
  70         const char *requested_ip;
  71         unsigned short requested_port;
  72         const char *expected_ip;
  73         unsigned short expected_port;
  74         const char *expected_src_ip;
  75         /* Expected test result */
  76         enum {
  77                 LOAD_REJECT,
  78                 ATTACH_REJECT,
  79                 SYSCALL_EPERM,
  80                 SYSCALL_ENOTSUPP,
  81                 SUCCESS,
  82         } expected_result;
  83 };
  84
  85 static int bind4_prog_load(const struct sock_addr_test *test);
  86 static int bind6_prog_load(const struct sock_addr_test *test);
  87 static int connect4_prog_load(const struct sock_addr_test *test);
  88 static int connect6_prog_load(const struct sock_addr_test *test);
  89 static int sendmsg_allow_prog_load(const struct sock_addr_test *test);
  90 static int sendmsg_deny_prog_load(const struct sock_addr_test *test);
  91 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
  92 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test);
  93 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
  94 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test);
  95 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test);
  96 static int sendmsg6_rw_wildcard_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: set dst IP = [::] (BSD'ism)",
 470                 sendmsg6_rw_wildcard_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                 SUCCESS,
 481         },
 482         {
 483                 "sendmsg6: preserve dst IP = [::] (BSD'ism)",
 484                 sendmsg_allow_prog_load,
 485                 BPF_CGROUP_UDP6_SENDMSG,
 486                 BPF_CGROUP_UDP6_SENDMSG,
 487                 AF_INET6,
 488                 SOCK_DGRAM,
 489                 WILDCARD6_IP,
 490                 SERV6_PORT,
 491                 SERV6_REWRITE_IP,
 492                 SERV6_PORT,
 493                 SRC6_IP,
 494                 SUCCESS,
 495         },
 496         {
 497                 "sendmsg6: deny call",
 498                 sendmsg_deny_prog_load,
 499                 BPF_CGROUP_UDP6_SENDMSG,
 500                 BPF_CGROUP_UDP6_SENDMSG,
 501                 AF_INET6,
 502                 SOCK_DGRAM,
 503                 SERV6_IP,
 504                 SERV6_PORT,
 505                 SERV6_REWRITE_IP,
 506                 SERV6_REWRITE_PORT,
 507                 SRC6_REWRITE_IP,
 508                 SYSCALL_EPERM,
 509         },
 510 };
 511
 512 static int mk_sockaddr(int domain, const char *ip, unsigned short port,
 513                        struct sockaddr *addr, socklen_t addr_len)
 514 {
 515         struct sockaddr_in6 *addr6;
 516         struct sockaddr_in *addr4;
 517
 518         if (domain != AF_INET && domain != AF_INET6) {
 519                 log_err("Unsupported address family");
 520                 return -1;
 521         }
 522
 523         memset(addr, 0, addr_len);
 524
 525         if (domain == AF_INET) {
 526                 if (addr_len < sizeof(struct sockaddr_in))
 527                         return -1;
 528                 addr4 = (struct sockaddr_in *)addr;
 529                 addr4->sin_family = domain;
 530                 addr4->sin_port = htons(port);
 531                 if (inet_pton(domain, ip, (void *)&addr4->sin_addr) != 1) {
 532                         log_err("Invalid IPv4: %s", ip);
 533                         return -1;
 534                 }
 535         } else if (domain == AF_INET6) {
 536                 if (addr_len < sizeof(struct sockaddr_in6))
 537                         return -1;
 538                 addr6 = (struct sockaddr_in6 *)addr;
 539                 addr6->sin6_family = domain;
 540                 addr6->sin6_port = htons(port);
 541                 if (inet_pton(domain, ip, (void *)&addr6->sin6_addr) != 1) {
 542                         log_err("Invalid IPv6: %s", ip);
 543                         return -1;
 544                 }
 545         }
 546
 547         return 0;
 548 }
 549
 550 static int load_insns(const struct sock_addr_test *test,
 551                       const struct bpf_insn *insns, size_t insns_cnt)
 552 {
 553         struct bpf_load_program_attr load_attr;
 554         int ret;
 555
 556         memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
 557         load_attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
 558         load_attr.expected_attach_type = test->expected_attach_type;
 559         load_attr.insns = insns;
 560         load_attr.insns_cnt = insns_cnt;
 561         load_attr.license = "GPL";
 562
 563         ret = bpf_load_program_xattr(&load_attr, bpf_log_buf, BPF_LOG_BUF_SIZE);
 564         if (ret < 0 && test->expected_result != LOAD_REJECT) {
 565                 log_err(">>> Loading program error.\n"
 566                         ">>> Verifier output:\n%s\n-------\n", bpf_log_buf);
 567         }
 568
 569         return ret;
 570 }
 571
 572 /* [1] These testing programs try to read different context fields, including
 573  * narrow loads of different sizes from user_ip4 and user_ip6, and write to
 574  * those allowed to be overridden.
 575  *
 576  * [2] BPF_LD_IMM64 & BPF_JMP_REG are used below whenever there is a need to
 577  * compare a register with unsigned 32bit integer. BPF_JMP_IMM can't be used
 578  * in such cases since it accepts only _signed_ 32bit integer as IMM
 579  * argument. Also note that BPF_LD_IMM64 contains 2 instructions what matters
 580  * to count jumps properly.
 581  */
 582
 583 static int bind4_prog_load(const struct sock_addr_test *test)
 584 {
 585         union {
 586                 uint8_t u4_addr8[4];
 587                 uint16_t u4_addr16[2];
 588                 uint32_t u4_addr32;
 589         } ip4;
 590         struct sockaddr_in addr4_rw;
 591
 592         if (inet_pton(AF_INET, SERV4_IP, (void *)&ip4) != 1) {
 593                 log_err("Invalid IPv4: %s", SERV4_IP);
 594                 return -1;
 595         }
 596
 597         if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
 598                         (struct sockaddr *)&addr4_rw, sizeof(addr4_rw)) == -1)
 599                 return -1;
 600
 601         /* See [1]. */
 602         struct bpf_insn insns[] = {
 603                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 604
 605                 /* if (sk.family == AF_INET && */
 606                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 607                             offsetof(struct bpf_sock_addr, family)),
 608                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 16),
 609
 610                 /*     (sk.type == SOCK_DGRAM || sk.type == SOCK_STREAM) && */
 611                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 612                             offsetof(struct bpf_sock_addr, type)),
 613                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 1),
 614                 BPF_JMP_A(1),
 615                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_STREAM, 12),
 616
 617                 /*     1st_byte_of_user_ip4 == expected && */
 618                 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
 619                             offsetof(struct bpf_sock_addr, user_ip4)),
 620                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[0], 10),
 621
 622                 /*     1st_half_of_user_ip4 == expected && */
 623                 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
 624                             offsetof(struct bpf_sock_addr, user_ip4)),
 625                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[0], 8),
 626
 627                 /*     whole_user_ip4 == expected) { */
 628                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 629                             offsetof(struct bpf_sock_addr, user_ip4)),
 630                 BPF_LD_IMM64(BPF_REG_8, ip4.u4_addr32), /* See [2]. */
 631                 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 4),
 632
 633                 /*      user_ip4 = addr4_rw.sin_addr */
 634                 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_addr.s_addr),
 635                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 636                             offsetof(struct bpf_sock_addr, user_ip4)),
 637
 638                 /*      user_port = addr4_rw.sin_port */
 639                 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_port),
 640                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 641                             offsetof(struct bpf_sock_addr, user_port)),
 642                 /* } */
 643
 644                 /* return 1 */
 645                 BPF_MOV64_IMM(BPF_REG_0, 1),
 646                 BPF_EXIT_INSN(),
 647         };
 648
 649         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 650 }
 651
 652 static int bind6_prog_load(const struct sock_addr_test *test)
 653 {
 654         struct sockaddr_in6 addr6_rw;
 655         struct in6_addr ip6;
 656
 657         if (inet_pton(AF_INET6, SERV6_IP, (void *)&ip6) != 1) {
 658                 log_err("Invalid IPv6: %s", SERV6_IP);
 659                 return -1;
 660         }
 661
 662         if (mk_sockaddr(AF_INET6, SERV6_REWRITE_IP, SERV6_REWRITE_PORT,
 663                         (struct sockaddr *)&addr6_rw, sizeof(addr6_rw)) == -1)
 664                 return -1;
 665
 666         /* See [1]. */
 667         struct bpf_insn insns[] = {
 668                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 669
 670                 /* if (sk.family == AF_INET6 && */
 671                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 672                             offsetof(struct bpf_sock_addr, family)),
 673                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
 674
 675                 /*            5th_byte_of_user_ip6 == expected && */
 676                 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
 677                             offsetof(struct bpf_sock_addr, user_ip6[1])),
 678                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr[4], 16),
 679
 680                 /*            3rd_half_of_user_ip6 == expected && */
 681                 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
 682                             offsetof(struct bpf_sock_addr, user_ip6[1])),
 683                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr16[2], 14),
 684
 685                 /*            last_word_of_user_ip6 == expected) { */
 686                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 687                             offsetof(struct bpf_sock_addr, user_ip6[3])),
 688                 BPF_LD_IMM64(BPF_REG_8, ip6.s6_addr32[3]),  /* See [2]. */
 689                 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 10),
 690
 691
 692 #define STORE_IPV6_WORD(N)                                                     \
 693                 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_addr.s6_addr32[N]),     \
 694                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,                       \
 695                             offsetof(struct bpf_sock_addr, user_ip6[N]))
 696
 697                 /*      user_ip6 = addr6_rw.sin6_addr */
 698                 STORE_IPV6_WORD(0),
 699                 STORE_IPV6_WORD(1),
 700                 STORE_IPV6_WORD(2),
 701                 STORE_IPV6_WORD(3),
 702
 703                 /*      user_port = addr6_rw.sin6_port */
 704                 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_port),
 705                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 706                             offsetof(struct bpf_sock_addr, user_port)),
 707
 708                 /* } */
 709
 710                 /* return 1 */
 711                 BPF_MOV64_IMM(BPF_REG_0, 1),
 712                 BPF_EXIT_INSN(),
 713         };
 714
 715         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 716 }
 717
 718 static int load_path(const struct sock_addr_test *test, const char *path)
 719 {
 720         struct bpf_prog_load_attr attr;
 721         struct bpf_object *obj;
 722         int prog_fd;
 723
 724         memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
 725         attr.file = path;
 726         attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
 727         attr.expected_attach_type = test->expected_attach_type;
 728
 729         if (bpf_prog_load_xattr(&attr, &obj, &prog_fd)) {
 730                 if (test->expected_result != LOAD_REJECT)
 731                         log_err(">>> Loading program (%s) error.\n", path);
 732                 return -1;
 733         }
 734
 735         return prog_fd;
 736 }
 737
 738 static int connect4_prog_load(const struct sock_addr_test *test)
 739 {
 740         return load_path(test, CONNECT4_PROG_PATH);
 741 }
 742
 743 static int connect6_prog_load(const struct sock_addr_test *test)
 744 {
 745         return load_path(test, CONNECT6_PROG_PATH);
 746 }
 747
 748 static int sendmsg_ret_only_prog_load(const struct sock_addr_test *test,
 749                                       int32_t rc)
 750 {
 751         struct bpf_insn insns[] = {
 752                 /* return rc */
 753                 BPF_MOV64_IMM(BPF_REG_0, rc),
 754                 BPF_EXIT_INSN(),
 755         };
 756         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 757 }
 758
 759 static int sendmsg_allow_prog_load(const struct sock_addr_test *test)
 760 {
 761         return sendmsg_ret_only_prog_load(test, /*rc*/ 1);
 762 }
 763
 764 static int sendmsg_deny_prog_load(const struct sock_addr_test *test)
 765 {
 766         return sendmsg_ret_only_prog_load(test, /*rc*/ 0);
 767 }
 768
 769 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
 770 {
 771         struct sockaddr_in dst4_rw_addr;
 772         struct in_addr src4_rw_ip;
 773
 774         if (inet_pton(AF_INET, SRC4_REWRITE_IP, (void *)&src4_rw_ip) != 1) {
 775                 log_err("Invalid IPv4: %s", SRC4_REWRITE_IP);
 776                 return -1;
 777         }
 778
 779         if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
 780                         (struct sockaddr *)&dst4_rw_addr,
 781                         sizeof(dst4_rw_addr)) == -1)
 782                 return -1;
 783
 784         struct bpf_insn insns[] = {
 785                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 786
 787                 /* if (sk.family == AF_INET && */
 788                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 789                             offsetof(struct bpf_sock_addr, family)),
 790                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 8),
 791
 792                 /*     sk.type == SOCK_DGRAM)  { */
 793                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 794                             offsetof(struct bpf_sock_addr, type)),
 795                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 6),
 796
 797                 /*      msg_src_ip4 = src4_rw_ip */
 798                 BPF_MOV32_IMM(BPF_REG_7, src4_rw_ip.s_addr),
 799                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 800                             offsetof(struct bpf_sock_addr, msg_src_ip4)),
 801
 802                 /*      user_ip4 = dst4_rw_addr.sin_addr */
 803                 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_addr.s_addr),
 804                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 805                             offsetof(struct bpf_sock_addr, user_ip4)),
 806
 807                 /*      user_port = dst4_rw_addr.sin_port */
 808                 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_port),
 809                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 810                             offsetof(struct bpf_sock_addr, user_port)),
 811                 /* } */
 812
 813                 /* return 1 */
 814                 BPF_MOV64_IMM(BPF_REG_0, 1),
 815                 BPF_EXIT_INSN(),
 816         };
 817
 818         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 819 }
 820
 821 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test)
 822 {
 823         return load_path(test, SENDMSG4_PROG_PATH);
 824 }
 825
 826 static int sendmsg6_rw_dst_asm_prog_load(const struct sock_addr_test *test,
 827                                          const char *rw_dst_ip)
 828 {
 829         struct sockaddr_in6 dst6_rw_addr;
 830         struct in6_addr src6_rw_ip;
 831
 832         if (inet_pton(AF_INET6, SRC6_REWRITE_IP, (void *)&src6_rw_ip) != 1) {
 833                 log_err("Invalid IPv6: %s", SRC6_REWRITE_IP);
 834                 return -1;
 835         }
 836
 837         if (mk_sockaddr(AF_INET6, rw_dst_ip, SERV6_REWRITE_PORT,
 838                         (struct sockaddr *)&dst6_rw_addr,
 839                         sizeof(dst6_rw_addr)) == -1)
 840                 return -1;
 841
 842         struct bpf_insn insns[] = {
 843                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 844
 845                 /* if (sk.family == AF_INET6) { */
 846                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 847                             offsetof(struct bpf_sock_addr, family)),
 848                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
 849
 850 #define STORE_IPV6_WORD_N(DST, SRC, N)                                         \
 851                 BPF_MOV32_IMM(BPF_REG_7, SRC[N]),                              \
 852                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,                       \
 853                             offsetof(struct bpf_sock_addr, DST[N]))
 854
 855 #define STORE_IPV6(DST, SRC)                                                   \
 856                 STORE_IPV6_WORD_N(DST, SRC, 0),                                \
 857                 STORE_IPV6_WORD_N(DST, SRC, 1),                                \
 858                 STORE_IPV6_WORD_N(DST, SRC, 2),                                \
 859                 STORE_IPV6_WORD_N(DST, SRC, 3)
 860
 861                 STORE_IPV6(msg_src_ip6, src6_rw_ip.s6_addr32),
 862                 STORE_IPV6(user_ip6, dst6_rw_addr.sin6_addr.s6_addr32),
 863
 864                 /*      user_port = dst6_rw_addr.sin6_port */
 865                 BPF_MOV32_IMM(BPF_REG_7, dst6_rw_addr.sin6_port),
 866                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 867                             offsetof(struct bpf_sock_addr, user_port)),
 868
 869                 /* } */
 870
 871                 /* return 1 */
 872                 BPF_MOV64_IMM(BPF_REG_0, 1),
 873                 BPF_EXIT_INSN(),
 874         };
 875
 876         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 877 }
 878
 879 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
 880 {
 881         return sendmsg6_rw_dst_asm_prog_load(test, SERV6_REWRITE_IP);
 882 }
 883
 884 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test)
 885 {
 886         return sendmsg6_rw_dst_asm_prog_load(test, SERV6_V4MAPPED_IP);
 887 }
 888
 889 static int sendmsg6_rw_wildcard_prog_load(const struct sock_addr_test *test)
 890 {
 891         return sendmsg6_rw_dst_asm_prog_load(test, WILDCARD6_IP);
 892 }
 893
 894 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test)
 895 {
 896         return load_path(test, SENDMSG6_PROG_PATH);
 897 }
 898
 899 static int cmp_addr(const struct sockaddr_storage *addr1,
 900                     const struct sockaddr_storage *addr2, int cmp_port)
 901 {
 902         const struct sockaddr_in *four1, *four2;
 903         const struct sockaddr_in6 *six1, *six2;
 904
 905         if (addr1->ss_family != addr2->ss_family)
 906                 return -1;
 907
 908         if (addr1->ss_family == AF_INET) {
 909                 four1 = (const struct sockaddr_in *)addr1;
 910                 four2 = (const struct sockaddr_in *)addr2;
 911                 return !((four1->sin_port == four2->sin_port || !cmp_port) &&
 912                          four1->sin_addr.s_addr == four2->sin_addr.s_addr);
 913         } else if (addr1->ss_family == AF_INET6) {
 914                 six1 = (const struct sockaddr_in6 *)addr1;
 915                 six2 = (const struct sockaddr_in6 *)addr2;
 916                 return !((six1->sin6_port == six2->sin6_port || !cmp_port) &&
 917                          !memcmp(&six1->sin6_addr, &six2->sin6_addr,
 918                                  sizeof(struct in6_addr)));
 919         }
 920
 921         return -1;
 922 }
 923
 924 static int cmp_sock_addr(info_fn fn, int sock1,
 925                          const struct sockaddr_storage *addr2, int cmp_port)
 926 {
 927         struct sockaddr_storage addr1;
 928         socklen_t len1 = sizeof(addr1);
 929
 930         memset(&addr1, 0, len1);
 931         if (fn(sock1, (struct sockaddr *)&addr1, (socklen_t *)&len1) != 0)
 932                 return -1;
 933
 934         return cmp_addr(&addr1, addr2, cmp_port);
 935 }
 936
 937 static int cmp_local_ip(int sock1, const struct sockaddr_storage *addr2)
 938 {
 939         return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 0);
 940 }
 941
 942 static int cmp_local_addr(int sock1, const struct sockaddr_storage *addr2)
 943 {
 944         return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 1);
 945 }
 946
 947 static int cmp_peer_addr(int sock1, const struct sockaddr_storage *addr2)
 948 {
 949         return cmp_sock_addr(getpeername, sock1, addr2, /*cmp_port*/ 1);
 950 }
 951
 952 static int start_server(int type, const struct sockaddr_storage *addr,
 953                         socklen_t addr_len)
 954 {
 955         int fd;
 956
 957         fd = socket(addr->ss_family, type, 0);
 958         if (fd == -1) {
 959                 log_err("Failed to create server socket");
 960                 goto out;
 961         }
 962
 963         if (bind(fd, (const struct sockaddr *)addr, addr_len) == -1) {
 964                 log_err("Failed to bind server socket");
 965                 goto close_out;
 966         }
 967
 968         if (type == SOCK_STREAM) {
 969                 if (listen(fd, 128) == -1) {
 970                         log_err("Failed to listen on server socket");
 971                         goto close_out;
 972                 }
 973         }
 974
 975         goto out;
 976 close_out:
 977         close(fd);
 978         fd = -1;
 979 out:
 980         return fd;
 981 }
 982
 983 static int connect_to_server(int type, const struct sockaddr_storage *addr,
 984                              socklen_t addr_len)
 985 {
 986         int domain;
 987         int fd = -1;
 988
 989         domain = addr->ss_family;
 990
 991         if (domain != AF_INET && domain != AF_INET6) {
 992                 log_err("Unsupported address family");
 993                 goto err;
 994         }
 995
 996         fd = socket(domain, type, 0);
 997         if (fd == -1) {
 998                 log_err("Failed to create client socket");
 999                 goto err;
1000         }
1001
1002         if (connect(fd, (const struct sockaddr *)addr, addr_len) == -1) {
1003                 log_err("Fail to connect to server");
1004                 goto err;
1005         }
1006
1007         goto out;
1008 err:
1009         close(fd);
1010         fd = -1;
1011 out:
1012         return fd;
1013 }
1014
1015 int init_pktinfo(int domain, struct cmsghdr *cmsg)
1016 {
1017         struct in6_pktinfo *pktinfo6;
1018         struct in_pktinfo *pktinfo4;
1019
1020         if (domain == AF_INET) {
1021                 cmsg->cmsg_level = SOL_IP;
1022                 cmsg->cmsg_type = IP_PKTINFO;
1023                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
1024                 pktinfo4 = (struct in_pktinfo *)CMSG_DATA(cmsg);
1025                 memset(pktinfo4, 0, sizeof(struct in_pktinfo));
1026                 if (inet_pton(domain, SRC4_IP,
1027                               (void *)&pktinfo4->ipi_spec_dst) != 1)
1028                         return -1;
1029         } else if (domain == AF_INET6) {
1030                 cmsg->cmsg_level = SOL_IPV6;
1031                 cmsg->cmsg_type = IPV6_PKTINFO;
1032                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1033                 pktinfo6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
1034                 memset(pktinfo6, 0, sizeof(struct in6_pktinfo));
1035                 if (inet_pton(domain, SRC6_IP,
1036                               (void *)&pktinfo6->ipi6_addr) != 1)
1037                         return -1;
1038         } else {
1039                 return -1;
1040         }
1041
1042         return 0;
1043 }
1044
1045 static int sendmsg_to_server(int type, const struct sockaddr_storage *addr,
1046                              socklen_t addr_len, int set_cmsg, int flags,
1047                              int *syscall_err)
1048 {
1049         union {
1050                 char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
1051                 struct cmsghdr align;
1052         } control6;
1053         union {
1054                 char buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
1055                 struct cmsghdr align;
1056         } control4;
1057         struct msghdr hdr;
1058         struct iovec iov;
1059         char data = 'a';
1060         int domain;
1061         int fd = -1;
1062
1063         domain = addr->ss_family;
1064
1065         if (domain != AF_INET && domain != AF_INET6) {
1066                 log_err("Unsupported address family");
1067                 goto err;
1068         }
1069
1070         fd = socket(domain, type, 0);
1071         if (fd == -1) {
1072                 log_err("Failed to create client socket");
1073                 goto err;
1074         }
1075
1076         memset(&iov, 0, sizeof(iov));
1077         iov.iov_base = &data;
1078         iov.iov_len = sizeof(data);
1079
1080         memset(&hdr, 0, sizeof(hdr));
1081         hdr.msg_name = (void *)addr;
1082         hdr.msg_namelen = addr_len;
1083         hdr.msg_iov = &iov;
1084         hdr.msg_iovlen = 1;
1085
1086         if (set_cmsg) {
1087                 if (domain == AF_INET) {
1088                         hdr.msg_control = &control4;
1089                         hdr.msg_controllen = sizeof(control4.buf);
1090                 } else if (domain == AF_INET6) {
1091                         hdr.msg_control = &control6;
1092                         hdr.msg_controllen = sizeof(control6.buf);
1093                 }
1094                 if (init_pktinfo(domain, CMSG_FIRSTHDR(&hdr))) {
1095                         log_err("Fail to init pktinfo");
1096                         goto err;
1097                 }
1098         }
1099
1100         if (sendmsg(fd, &hdr, flags) != sizeof(data)) {
1101                 log_err("Fail to send message to server");
1102                 *syscall_err = errno;
1103                 goto err;
1104         }
1105
1106         goto out;
1107 err:
1108         close(fd);
1109         fd = -1;
1110 out:
1111         return fd;
1112 }
1113
1114 static int fastconnect_to_server(const struct sockaddr_storage *addr,
1115                                  socklen_t addr_len)
1116 {
1117         int sendmsg_err;
1118
1119         return sendmsg_to_server(SOCK_STREAM, addr, addr_len, /*set_cmsg*/0,
1120                                  MSG_FASTOPEN, &sendmsg_err);
1121 }
1122
1123 static int recvmsg_from_client(int sockfd, struct sockaddr_storage *src_addr)
1124 {
1125         struct timeval tv;
1126         struct msghdr hdr;
1127         struct iovec iov;
1128         char data[64];
1129         fd_set rfds;
1130
1131         FD_ZERO(&rfds);
1132         FD_SET(sockfd, &rfds);
1133
1134         tv.tv_sec = 2;
1135         tv.tv_usec = 0;
1136
1137         if (select(sockfd + 1, &rfds, NULL, NULL, &tv) <= 0 ||
1138             !FD_ISSET(sockfd, &rfds))
1139                 return -1;
1140
1141         memset(&iov, 0, sizeof(iov));
1142         iov.iov_base = data;
1143         iov.iov_len = sizeof(data);
1144
1145         memset(&hdr, 0, sizeof(hdr));
1146         hdr.msg_name = src_addr;
1147         hdr.msg_namelen = sizeof(struct sockaddr_storage);
1148         hdr.msg_iov = &iov;
1149         hdr.msg_iovlen = 1;
1150
1151         return recvmsg(sockfd, &hdr, 0);
1152 }
1153
1154 static int init_addrs(const struct sock_addr_test *test,
1155                       struct sockaddr_storage *requested_addr,
1156                       struct sockaddr_storage *expected_addr,
1157                       struct sockaddr_storage *expected_src_addr)
1158 {
1159         socklen_t addr_len = sizeof(struct sockaddr_storage);
1160
1161         if (mk_sockaddr(test->domain, test->expected_ip, test->expected_port,
1162                         (struct sockaddr *)expected_addr, addr_len) == -1)
1163                 goto err;
1164
1165         if (mk_sockaddr(test->domain, test->requested_ip, test->requested_port,
1166                         (struct sockaddr *)requested_addr, addr_len) == -1)
1167                 goto err;
1168
1169         if (test->expected_src_ip &&
1170             mk_sockaddr(test->domain, test->expected_src_ip, 0,
1171                         (struct sockaddr *)expected_src_addr, addr_len) == -1)
1172                 goto err;
1173
1174         return 0;
1175 err:
1176         return -1;
1177 }
1178
1179 static int run_bind_test_case(const struct sock_addr_test *test)
1180 {
1181         socklen_t addr_len = sizeof(struct sockaddr_storage);
1182         struct sockaddr_storage requested_addr;
1183         struct sockaddr_storage expected_addr;
1184         int clientfd = -1;
1185         int servfd = -1;
1186         int err = 0;
1187
1188         if (init_addrs(test, &requested_addr, &expected_addr, NULL))
1189                 goto err;
1190
1191         servfd = start_server(test->type, &requested_addr, addr_len);
1192         if (servfd == -1)
1193                 goto err;
1194
1195         if (cmp_local_addr(servfd, &expected_addr))
1196                 goto err;
1197
1198         /* Try to connect to server just in case */
1199         clientfd = connect_to_server(test->type, &expected_addr, addr_len);
1200         if (clientfd == -1)
1201                 goto err;
1202
1203         goto out;
1204 err:
1205         err = -1;
1206 out:
1207         close(clientfd);
1208         close(servfd);
1209         return err;
1210 }
1211
1212 static int run_connect_test_case(const struct sock_addr_test *test)
1213 {
1214         socklen_t addr_len = sizeof(struct sockaddr_storage);
1215         struct sockaddr_storage expected_src_addr;
1216         struct sockaddr_storage requested_addr;
1217         struct sockaddr_storage expected_addr;
1218         int clientfd = -1;
1219         int servfd = -1;
1220         int err = 0;
1221
1222         if (init_addrs(test, &requested_addr, &expected_addr,
1223                        &expected_src_addr))
1224                 goto err;
1225
1226         /* Prepare server to connect to */
1227         servfd = start_server(test->type, &expected_addr, addr_len);
1228         if (servfd == -1)
1229                 goto err;
1230
1231         clientfd = connect_to_server(test->type, &requested_addr, addr_len);
1232         if (clientfd == -1)
1233                 goto err;
1234
1235         /* Make sure src and dst addrs were overridden properly */
1236         if (cmp_peer_addr(clientfd, &expected_addr))
1237                 goto err;
1238
1239         if (cmp_local_ip(clientfd, &expected_src_addr))
1240                 goto err;
1241
1242         if (test->type == SOCK_STREAM) {
1243                 /* Test TCP Fast Open scenario */
1244                 clientfd = fastconnect_to_server(&requested_addr, addr_len);
1245                 if (clientfd == -1)
1246                         goto err;
1247
1248                 /* Make sure src and dst addrs were overridden properly */
1249                 if (cmp_peer_addr(clientfd, &expected_addr))
1250                         goto err;
1251
1252                 if (cmp_local_ip(clientfd, &expected_src_addr))
1253                         goto err;
1254         }
1255
1256         goto out;
1257 err:
1258         err = -1;
1259 out:
1260         close(clientfd);
1261         close(servfd);
1262         return err;
1263 }
1264
1265 static int run_sendmsg_test_case(const struct sock_addr_test *test)
1266 {
1267         socklen_t addr_len = sizeof(struct sockaddr_storage);
1268         struct sockaddr_storage expected_src_addr;
1269         struct sockaddr_storage requested_addr;
1270         struct sockaddr_storage expected_addr;
1271         struct sockaddr_storage real_src_addr;
1272         int clientfd = -1;
1273         int servfd = -1;
1274         int set_cmsg;
1275         int err = 0;
1276
1277         if (test->type != SOCK_DGRAM)
1278                 goto err;
1279
1280         if (init_addrs(test, &requested_addr, &expected_addr,
1281                        &expected_src_addr))
1282                 goto err;
1283
1284         /* Prepare server to sendmsg to */
1285         servfd = start_server(test->type, &expected_addr, addr_len);
1286         if (servfd == -1)
1287                 goto err;
1288
1289         for (set_cmsg = 0; set_cmsg <= 1; ++set_cmsg) {
1290                 if (clientfd >= 0)
1291                         close(clientfd);
1292
1293                 clientfd = sendmsg_to_server(test->type, &requested_addr,
1294                                              addr_len, set_cmsg, /*flags*/0,
1295                                              &err);
1296                 if (err)
1297                         goto out;
1298                 else if (clientfd == -1)
1299                         goto err;
1300
1301                 /* Try to receive message on server instead of using
1302                  * getpeername(2) on client socket, to check that client's
1303                  * destination address was rewritten properly, since
1304                  * getpeername(2) doesn't work with unconnected datagram
1305                  * sockets.
1306                  *
1307                  * Get source address from recvmsg(2) as well to make sure
1308                  * source was rewritten properly: getsockname(2) can't be used
1309                  * since socket is unconnected and source defined for one
1310                  * specific packet may differ from the one used by default and
1311                  * returned by getsockname(2).
1312                  */
1313                 if (recvmsg_from_client(servfd, &real_src_addr) == -1)
1314                         goto err;
1315
1316                 if (cmp_addr(&real_src_addr, &expected_src_addr, /*cmp_port*/0))
1317                         goto err;
1318         }
1319
1320         goto out;
1321 err:
1322         err = -1;
1323 out:
1324         close(clientfd);
1325         close(servfd);
1326         return err;
1327 }
1328
1329 static int run_test_case(int cgfd, const struct sock_addr_test *test)
1330 {
1331         int progfd = -1;
1332         int err = 0;
1333
1334         printf("Test case: %s .. ", test->descr);
1335
1336         progfd = test->loadfn(test);
1337         if (test->expected_result == LOAD_REJECT && progfd < 0)
1338                 goto out;
1339         else if (test->expected_result == LOAD_REJECT || progfd < 0)
1340                 goto err;
1341
1342         err = bpf_prog_attach(progfd, cgfd, test->attach_type,
1343                               BPF_F_ALLOW_OVERRIDE);
1344         if (test->expected_result == ATTACH_REJECT && err) {
1345                 err = 0; /* error was expected, reset it */
1346                 goto out;
1347         } else if (test->expected_result == ATTACH_REJECT || err) {
1348                 goto err;
1349         }
1350
1351         switch (test->attach_type) {
1352         case BPF_CGROUP_INET4_BIND:
1353         case BPF_CGROUP_INET6_BIND:
1354                 err = run_bind_test_case(test);
1355                 break;
1356         case BPF_CGROUP_INET4_CONNECT:
1357         case BPF_CGROUP_INET6_CONNECT:
1358                 err = run_connect_test_case(test);
1359                 break;
1360         case BPF_CGROUP_UDP4_SENDMSG:
1361         case BPF_CGROUP_UDP6_SENDMSG:
1362                 err = run_sendmsg_test_case(test);
1363                 break;
1364         default:
1365                 goto err;
1366         }
1367
1368         if (test->expected_result == SYSCALL_EPERM && err == EPERM) {
1369                 err = 0; /* error was expected, reset it */
1370                 goto out;
1371         }
1372
1373         if (test->expected_result == SYSCALL_ENOTSUPP && err == ENOTSUPP) {
1374                 err = 0; /* error was expected, reset it */
1375                 goto out;
1376         }
1377
1378         if (err || test->expected_result != SUCCESS)
1379                 goto err;
1380
1381         goto out;
1382 err:
1383         err = -1;
1384 out:
1385         /* Detaching w/o checking return code: best effort attempt. */
1386         if (progfd != -1)
1387                 bpf_prog_detach(cgfd, test->attach_type);
1388         close(progfd);
1389         printf("[%s]\n", err ? "FAIL" : "PASS");
1390         return err;
1391 }
1392
1393 static int run_tests(int cgfd)
1394 {
1395         int passes = 0;
1396         int fails = 0;
1397         int i;
1398
1399         for (i = 0; i < ARRAY_SIZE(tests); ++i) {
1400                 if (run_test_case(cgfd, &tests[i]))
1401                         ++fails;
1402                 else
1403                         ++passes;
1404         }
1405         printf("Summary: %d PASSED, %d FAILED\n", passes, fails);
1406         return fails ? -1 : 0;
1407 }
1408
1409 int main(int argc, char **argv)
1410 {
1411         int cgfd = -1;
1412         int err = 0;
1413
1414         if (argc < 2) {
1415                 fprintf(stderr,
1416                         "%s has to be run via %s.sh. Skip direct run.\n",
1417                         argv[0], argv[0]);
1418                 exit(err);
1419         }
1420
1421         if (setup_cgroup_environment())
1422                 goto err;
1423
1424         cgfd = create_and_get_cgroup(CG_PATH);
1425         if (!cgfd)
1426                 goto err;
1427
1428         if (join_cgroup(CG_PATH))
1429                 goto err;
1430
1431         if (run_tests(cgfd))
1432                 goto err;
1433
1434         goto out;
1435 err:
1436         err = -1;
1437 out:
1438         close(cgfd);
1439         cleanup_cgroup_environment();
1440         return err;
1441 }