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                 ATTACH_OKAY,
  80                 SYSCALL_EPERM,
  81                 SYSCALL_ENOTSUPP,
  82                 SUCCESS,
  83         } expected_result;
  84 };
  85
  86 static int bind4_prog_load(const struct sock_addr_test *test);
  87 static int bind6_prog_load(const struct sock_addr_test *test);
  88 static int connect4_prog_load(const struct sock_addr_test *test);
  89 static int connect6_prog_load(const struct sock_addr_test *test);
  90 static int sendmsg_allow_prog_load(const struct sock_addr_test *test);
  91 static int sendmsg_deny_prog_load(const struct sock_addr_test *test);
  92 static int recvmsg_allow_prog_load(const struct sock_addr_test *test);
  93 static int recvmsg_deny_prog_load(const struct sock_addr_test *test);
  94 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
  95 static int recvmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
  96 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test);
  97 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
  98 static int recvmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
  99 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test);
 100 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test);
 101 static int sendmsg6_rw_wildcard_prog_load(const struct sock_addr_test *test);
 102
 103 static struct sock_addr_test tests[] = {
 104         /* bind */
 105         {
 106                 "bind4: load prog with wrong expected attach type",
 107                 bind4_prog_load,
 108                 BPF_CGROUP_INET6_BIND,
 109                 BPF_CGROUP_INET4_BIND,
 110                 AF_INET,
 111                 SOCK_STREAM,
 112                 NULL,
 113                 0,
 114                 NULL,
 115                 0,
 116                 NULL,
 117                 LOAD_REJECT,
 118         },
 119         {
 120                 "bind4: attach prog with wrong attach type",
 121                 bind4_prog_load,
 122                 BPF_CGROUP_INET4_BIND,
 123                 BPF_CGROUP_INET6_BIND,
 124                 AF_INET,
 125                 SOCK_STREAM,
 126                 NULL,
 127                 0,
 128                 NULL,
 129                 0,
 130                 NULL,
 131                 ATTACH_REJECT,
 132         },
 133         {
 134                 "bind4: rewrite IP & TCP port in",
 135                 bind4_prog_load,
 136                 BPF_CGROUP_INET4_BIND,
 137                 BPF_CGROUP_INET4_BIND,
 138                 AF_INET,
 139                 SOCK_STREAM,
 140                 SERV4_IP,
 141                 SERV4_PORT,
 142                 SERV4_REWRITE_IP,
 143                 SERV4_REWRITE_PORT,
 144                 NULL,
 145                 SUCCESS,
 146         },
 147         {
 148                 "bind4: rewrite IP & UDP port in",
 149                 bind4_prog_load,
 150                 BPF_CGROUP_INET4_BIND,
 151                 BPF_CGROUP_INET4_BIND,
 152                 AF_INET,
 153                 SOCK_DGRAM,
 154                 SERV4_IP,
 155                 SERV4_PORT,
 156                 SERV4_REWRITE_IP,
 157                 SERV4_REWRITE_PORT,
 158                 NULL,
 159                 SUCCESS,
 160         },
 161         {
 162                 "bind6: load prog with wrong expected attach type",
 163                 bind6_prog_load,
 164                 BPF_CGROUP_INET4_BIND,
 165                 BPF_CGROUP_INET6_BIND,
 166                 AF_INET6,
 167                 SOCK_STREAM,
 168                 NULL,
 169                 0,
 170                 NULL,
 171                 0,
 172                 NULL,
 173                 LOAD_REJECT,
 174         },
 175         {
 176                 "bind6: attach prog with wrong attach type",
 177                 bind6_prog_load,
 178                 BPF_CGROUP_INET6_BIND,
 179                 BPF_CGROUP_INET4_BIND,
 180                 AF_INET,
 181                 SOCK_STREAM,
 182                 NULL,
 183                 0,
 184                 NULL,
 185                 0,
 186                 NULL,
 187                 ATTACH_REJECT,
 188         },
 189         {
 190                 "bind6: rewrite IP & TCP port in",
 191                 bind6_prog_load,
 192                 BPF_CGROUP_INET6_BIND,
 193                 BPF_CGROUP_INET6_BIND,
 194                 AF_INET6,
 195                 SOCK_STREAM,
 196                 SERV6_IP,
 197                 SERV6_PORT,
 198                 SERV6_REWRITE_IP,
 199                 SERV6_REWRITE_PORT,
 200                 NULL,
 201                 SUCCESS,
 202         },
 203         {
 204                 "bind6: rewrite IP & UDP port in",
 205                 bind6_prog_load,
 206                 BPF_CGROUP_INET6_BIND,
 207                 BPF_CGROUP_INET6_BIND,
 208                 AF_INET6,
 209                 SOCK_DGRAM,
 210                 SERV6_IP,
 211                 SERV6_PORT,
 212                 SERV6_REWRITE_IP,
 213                 SERV6_REWRITE_PORT,
 214                 NULL,
 215                 SUCCESS,
 216         },
 217
 218         /* connect */
 219         {
 220                 "connect4: load prog with wrong expected attach type",
 221                 connect4_prog_load,
 222                 BPF_CGROUP_INET6_CONNECT,
 223                 BPF_CGROUP_INET4_CONNECT,
 224                 AF_INET,
 225                 SOCK_STREAM,
 226                 NULL,
 227                 0,
 228                 NULL,
 229                 0,
 230                 NULL,
 231                 LOAD_REJECT,
 232         },
 233         {
 234                 "connect4: attach prog with wrong attach type",
 235                 connect4_prog_load,
 236                 BPF_CGROUP_INET4_CONNECT,
 237                 BPF_CGROUP_INET6_CONNECT,
 238                 AF_INET,
 239                 SOCK_STREAM,
 240                 NULL,
 241                 0,
 242                 NULL,
 243                 0,
 244                 NULL,
 245                 ATTACH_REJECT,
 246         },
 247         {
 248                 "connect4: rewrite IP & TCP port",
 249                 connect4_prog_load,
 250                 BPF_CGROUP_INET4_CONNECT,
 251                 BPF_CGROUP_INET4_CONNECT,
 252                 AF_INET,
 253                 SOCK_STREAM,
 254                 SERV4_IP,
 255                 SERV4_PORT,
 256                 SERV4_REWRITE_IP,
 257                 SERV4_REWRITE_PORT,
 258                 SRC4_REWRITE_IP,
 259                 SUCCESS,
 260         },
 261         {
 262                 "connect4: rewrite IP & UDP port",
 263                 connect4_prog_load,
 264                 BPF_CGROUP_INET4_CONNECT,
 265                 BPF_CGROUP_INET4_CONNECT,
 266                 AF_INET,
 267                 SOCK_DGRAM,
 268                 SERV4_IP,
 269                 SERV4_PORT,
 270                 SERV4_REWRITE_IP,
 271                 SERV4_REWRITE_PORT,
 272                 SRC4_REWRITE_IP,
 273                 SUCCESS,
 274         },
 275         {
 276                 "connect6: load prog with wrong expected attach type",
 277                 connect6_prog_load,
 278                 BPF_CGROUP_INET4_CONNECT,
 279                 BPF_CGROUP_INET6_CONNECT,
 280                 AF_INET6,
 281                 SOCK_STREAM,
 282                 NULL,
 283                 0,
 284                 NULL,
 285                 0,
 286                 NULL,
 287                 LOAD_REJECT,
 288         },
 289         {
 290                 "connect6: attach prog with wrong attach type",
 291                 connect6_prog_load,
 292                 BPF_CGROUP_INET6_CONNECT,
 293                 BPF_CGROUP_INET4_CONNECT,
 294                 AF_INET,
 295                 SOCK_STREAM,
 296                 NULL,
 297                 0,
 298                 NULL,
 299                 0,
 300                 NULL,
 301                 ATTACH_REJECT,
 302         },
 303         {
 304                 "connect6: rewrite IP & TCP port",
 305                 connect6_prog_load,
 306                 BPF_CGROUP_INET6_CONNECT,
 307                 BPF_CGROUP_INET6_CONNECT,
 308                 AF_INET6,
 309                 SOCK_STREAM,
 310                 SERV6_IP,
 311                 SERV6_PORT,
 312                 SERV6_REWRITE_IP,
 313                 SERV6_REWRITE_PORT,
 314                 SRC6_REWRITE_IP,
 315                 SUCCESS,
 316         },
 317         {
 318                 "connect6: rewrite IP & UDP port",
 319                 connect6_prog_load,
 320                 BPF_CGROUP_INET6_CONNECT,
 321                 BPF_CGROUP_INET6_CONNECT,
 322                 AF_INET6,
 323                 SOCK_DGRAM,
 324                 SERV6_IP,
 325                 SERV6_PORT,
 326                 SERV6_REWRITE_IP,
 327                 SERV6_REWRITE_PORT,
 328                 SRC6_REWRITE_IP,
 329                 SUCCESS,
 330         },
 331
 332         /* sendmsg */
 333         {
 334                 "sendmsg4: load prog with wrong expected attach type",
 335                 sendmsg4_rw_asm_prog_load,
 336                 BPF_CGROUP_UDP6_SENDMSG,
 337                 BPF_CGROUP_UDP4_SENDMSG,
 338                 AF_INET,
 339                 SOCK_DGRAM,
 340                 NULL,
 341                 0,
 342                 NULL,
 343                 0,
 344                 NULL,
 345                 LOAD_REJECT,
 346         },
 347         {
 348                 "sendmsg4: attach prog with wrong attach type",
 349                 sendmsg4_rw_asm_prog_load,
 350                 BPF_CGROUP_UDP4_SENDMSG,
 351                 BPF_CGROUP_UDP6_SENDMSG,
 352                 AF_INET,
 353                 SOCK_DGRAM,
 354                 NULL,
 355                 0,
 356                 NULL,
 357                 0,
 358                 NULL,
 359                 ATTACH_REJECT,
 360         },
 361         {
 362                 "sendmsg4: rewrite IP & port (asm)",
 363                 sendmsg4_rw_asm_prog_load,
 364                 BPF_CGROUP_UDP4_SENDMSG,
 365                 BPF_CGROUP_UDP4_SENDMSG,
 366                 AF_INET,
 367                 SOCK_DGRAM,
 368                 SERV4_IP,
 369                 SERV4_PORT,
 370                 SERV4_REWRITE_IP,
 371                 SERV4_REWRITE_PORT,
 372                 SRC4_REWRITE_IP,
 373                 SUCCESS,
 374         },
 375         {
 376                 "sendmsg4: rewrite IP & port (C)",
 377                 sendmsg4_rw_c_prog_load,
 378                 BPF_CGROUP_UDP4_SENDMSG,
 379                 BPF_CGROUP_UDP4_SENDMSG,
 380                 AF_INET,
 381                 SOCK_DGRAM,
 382                 SERV4_IP,
 383                 SERV4_PORT,
 384                 SERV4_REWRITE_IP,
 385                 SERV4_REWRITE_PORT,
 386                 SRC4_REWRITE_IP,
 387                 SUCCESS,
 388         },
 389         {
 390                 "sendmsg4: deny call",
 391                 sendmsg_deny_prog_load,
 392                 BPF_CGROUP_UDP4_SENDMSG,
 393                 BPF_CGROUP_UDP4_SENDMSG,
 394                 AF_INET,
 395                 SOCK_DGRAM,
 396                 SERV4_IP,
 397                 SERV4_PORT,
 398                 SERV4_REWRITE_IP,
 399                 SERV4_REWRITE_PORT,
 400                 SRC4_REWRITE_IP,
 401                 SYSCALL_EPERM,
 402         },
 403         {
 404                 "sendmsg6: load prog with wrong expected attach type",
 405                 sendmsg6_rw_asm_prog_load,
 406                 BPF_CGROUP_UDP4_SENDMSG,
 407                 BPF_CGROUP_UDP6_SENDMSG,
 408                 AF_INET6,
 409                 SOCK_DGRAM,
 410                 NULL,
 411                 0,
 412                 NULL,
 413                 0,
 414                 NULL,
 415                 LOAD_REJECT,
 416         },
 417         {
 418                 "sendmsg6: attach prog with wrong attach type",
 419                 sendmsg6_rw_asm_prog_load,
 420                 BPF_CGROUP_UDP6_SENDMSG,
 421                 BPF_CGROUP_UDP4_SENDMSG,
 422                 AF_INET6,
 423                 SOCK_DGRAM,
 424                 NULL,
 425                 0,
 426                 NULL,
 427                 0,
 428                 NULL,
 429                 ATTACH_REJECT,
 430         },
 431         {
 432                 "sendmsg6: rewrite IP & port (asm)",
 433                 sendmsg6_rw_asm_prog_load,
 434                 BPF_CGROUP_UDP6_SENDMSG,
 435                 BPF_CGROUP_UDP6_SENDMSG,
 436                 AF_INET6,
 437                 SOCK_DGRAM,
 438                 SERV6_IP,
 439                 SERV6_PORT,
 440                 SERV6_REWRITE_IP,
 441                 SERV6_REWRITE_PORT,
 442                 SRC6_REWRITE_IP,
 443                 SUCCESS,
 444         },
 445         {
 446                 "sendmsg6: rewrite IP & port (C)",
 447                 sendmsg6_rw_c_prog_load,
 448                 BPF_CGROUP_UDP6_SENDMSG,
 449                 BPF_CGROUP_UDP6_SENDMSG,
 450                 AF_INET6,
 451                 SOCK_DGRAM,
 452                 SERV6_IP,
 453                 SERV6_PORT,
 454                 SERV6_REWRITE_IP,
 455                 SERV6_REWRITE_PORT,
 456                 SRC6_REWRITE_IP,
 457                 SUCCESS,
 458         },
 459         {
 460                 "sendmsg6: IPv4-mapped IPv6",
 461                 sendmsg6_rw_v4mapped_prog_load,
 462                 BPF_CGROUP_UDP6_SENDMSG,
 463                 BPF_CGROUP_UDP6_SENDMSG,
 464                 AF_INET6,
 465                 SOCK_DGRAM,
 466                 SERV6_IP,
 467                 SERV6_PORT,
 468                 SERV6_REWRITE_IP,
 469                 SERV6_REWRITE_PORT,
 470                 SRC6_REWRITE_IP,
 471                 SYSCALL_ENOTSUPP,
 472         },
 473         {
 474                 "sendmsg6: set dst IP = [::] (BSD'ism)",
 475                 sendmsg6_rw_wildcard_prog_load,
 476                 BPF_CGROUP_UDP6_SENDMSG,
 477                 BPF_CGROUP_UDP6_SENDMSG,
 478                 AF_INET6,
 479                 SOCK_DGRAM,
 480                 SERV6_IP,
 481                 SERV6_PORT,
 482                 SERV6_REWRITE_IP,
 483                 SERV6_REWRITE_PORT,
 484                 SRC6_REWRITE_IP,
 485                 SUCCESS,
 486         },
 487         {
 488                 "sendmsg6: preserve dst IP = [::] (BSD'ism)",
 489                 sendmsg_allow_prog_load,
 490                 BPF_CGROUP_UDP6_SENDMSG,
 491                 BPF_CGROUP_UDP6_SENDMSG,
 492                 AF_INET6,
 493                 SOCK_DGRAM,
 494                 WILDCARD6_IP,
 495                 SERV6_PORT,
 496                 SERV6_REWRITE_IP,
 497                 SERV6_PORT,
 498                 SRC6_IP,
 499                 SUCCESS,
 500         },
 501         {
 502                 "sendmsg6: deny call",
 503                 sendmsg_deny_prog_load,
 504                 BPF_CGROUP_UDP6_SENDMSG,
 505                 BPF_CGROUP_UDP6_SENDMSG,
 506                 AF_INET6,
 507                 SOCK_DGRAM,
 508                 SERV6_IP,
 509                 SERV6_PORT,
 510                 SERV6_REWRITE_IP,
 511                 SERV6_REWRITE_PORT,
 512                 SRC6_REWRITE_IP,
 513                 SYSCALL_EPERM,
 514         },
 515
 516         /* recvmsg */
 517         {
 518                 "recvmsg4: return code ok",
 519                 recvmsg_allow_prog_load,
 520                 BPF_CGROUP_UDP4_RECVMSG,
 521                 BPF_CGROUP_UDP4_RECVMSG,
 522                 AF_INET,
 523                 SOCK_DGRAM,
 524                 NULL,
 525                 0,
 526                 NULL,
 527                 0,
 528                 NULL,
 529                 ATTACH_OKAY,
 530         },
 531         {
 532                 "recvmsg4: return code !ok",
 533                 recvmsg_deny_prog_load,
 534                 BPF_CGROUP_UDP4_RECVMSG,
 535                 BPF_CGROUP_UDP4_RECVMSG,
 536                 AF_INET,
 537                 SOCK_DGRAM,
 538                 NULL,
 539                 0,
 540                 NULL,
 541                 0,
 542                 NULL,
 543                 LOAD_REJECT,
 544         },
 545         {
 546                 "recvmsg6: return code ok",
 547                 recvmsg_allow_prog_load,
 548                 BPF_CGROUP_UDP6_RECVMSG,
 549                 BPF_CGROUP_UDP6_RECVMSG,
 550                 AF_INET6,
 551                 SOCK_DGRAM,
 552                 NULL,
 553                 0,
 554                 NULL,
 555                 0,
 556                 NULL,
 557                 ATTACH_OKAY,
 558         },
 559         {
 560                 "recvmsg6: return code !ok",
 561                 recvmsg_deny_prog_load,
 562                 BPF_CGROUP_UDP6_RECVMSG,
 563                 BPF_CGROUP_UDP6_RECVMSG,
 564                 AF_INET6,
 565                 SOCK_DGRAM,
 566                 NULL,
 567                 0,
 568                 NULL,
 569                 0,
 570                 NULL,
 571                 LOAD_REJECT,
 572         },
 573         {
 574                 "recvmsg4: rewrite IP & port (asm)",
 575                 recvmsg4_rw_asm_prog_load,
 576                 BPF_CGROUP_UDP4_RECVMSG,
 577                 BPF_CGROUP_UDP4_RECVMSG,
 578                 AF_INET,
 579                 SOCK_DGRAM,
 580                 SERV4_REWRITE_IP,
 581                 SERV4_REWRITE_PORT,
 582                 SERV4_REWRITE_IP,
 583                 SERV4_REWRITE_PORT,
 584                 SERV4_IP,
 585                 SUCCESS,
 586         },
 587         {
 588                 "recvmsg6: rewrite IP & port (asm)",
 589                 recvmsg6_rw_asm_prog_load,
 590                 BPF_CGROUP_UDP6_RECVMSG,
 591                 BPF_CGROUP_UDP6_RECVMSG,
 592                 AF_INET6,
 593                 SOCK_DGRAM,
 594                 SERV6_REWRITE_IP,
 595                 SERV6_REWRITE_PORT,
 596                 SERV6_REWRITE_IP,
 597                 SERV6_REWRITE_PORT,
 598                 SERV6_IP,
 599                 SUCCESS,
 600         },
 601 };
 602
 603 static int mk_sockaddr(int domain, const char *ip, unsigned short port,
 604                        struct sockaddr *addr, socklen_t addr_len)
 605 {
 606         struct sockaddr_in6 *addr6;
 607         struct sockaddr_in *addr4;
 608
 609         if (domain != AF_INET && domain != AF_INET6) {
 610                 log_err("Unsupported address family");
 611                 return -1;
 612         }
 613
 614         memset(addr, 0, addr_len);
 615
 616         if (domain == AF_INET) {
 617                 if (addr_len < sizeof(struct sockaddr_in))
 618                         return -1;
 619                 addr4 = (struct sockaddr_in *)addr;
 620                 addr4->sin_family = domain;
 621                 addr4->sin_port = htons(port);
 622                 if (inet_pton(domain, ip, (void *)&addr4->sin_addr) != 1) {
 623                         log_err("Invalid IPv4: %s", ip);
 624                         return -1;
 625                 }
 626         } else if (domain == AF_INET6) {
 627                 if (addr_len < sizeof(struct sockaddr_in6))
 628                         return -1;
 629                 addr6 = (struct sockaddr_in6 *)addr;
 630                 addr6->sin6_family = domain;
 631                 addr6->sin6_port = htons(port);
 632                 if (inet_pton(domain, ip, (void *)&addr6->sin6_addr) != 1) {
 633                         log_err("Invalid IPv6: %s", ip);
 634                         return -1;
 635                 }
 636         }
 637
 638         return 0;
 639 }
 640
 641 static int load_insns(const struct sock_addr_test *test,
 642                       const struct bpf_insn *insns, size_t insns_cnt)
 643 {
 644         struct bpf_load_program_attr load_attr;
 645         int ret;
 646
 647         memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
 648         load_attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
 649         load_attr.expected_attach_type = test->expected_attach_type;
 650         load_attr.insns = insns;
 651         load_attr.insns_cnt = insns_cnt;
 652         load_attr.license = "GPL";
 653
 654         ret = bpf_load_program_xattr(&load_attr, bpf_log_buf, BPF_LOG_BUF_SIZE);
 655         if (ret < 0 && test->expected_result != LOAD_REJECT) {
 656                 log_err(">>> Loading program error.\n"
 657                         ">>> Verifier output:\n%s\n-------\n", bpf_log_buf);
 658         }
 659
 660         return ret;
 661 }
 662
 663 /* [1] These testing programs try to read different context fields, including
 664  * narrow loads of different sizes from user_ip4 and user_ip6, and write to
 665  * those allowed to be overridden.
 666  *
 667  * [2] BPF_LD_IMM64 & BPF_JMP_REG are used below whenever there is a need to
 668  * compare a register with unsigned 32bit integer. BPF_JMP_IMM can't be used
 669  * in such cases since it accepts only _signed_ 32bit integer as IMM
 670  * argument. Also note that BPF_LD_IMM64 contains 2 instructions what matters
 671  * to count jumps properly.
 672  */
 673
 674 static int bind4_prog_load(const struct sock_addr_test *test)
 675 {
 676         union {
 677                 uint8_t u4_addr8[4];
 678                 uint16_t u4_addr16[2];
 679                 uint32_t u4_addr32;
 680         } ip4;
 681         struct sockaddr_in addr4_rw;
 682
 683         if (inet_pton(AF_INET, SERV4_IP, (void *)&ip4) != 1) {
 684                 log_err("Invalid IPv4: %s", SERV4_IP);
 685                 return -1;
 686         }
 687
 688         if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
 689                         (struct sockaddr *)&addr4_rw, sizeof(addr4_rw)) == -1)
 690                 return -1;
 691
 692         /* See [1]. */
 693         struct bpf_insn insns[] = {
 694                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 695
 696                 /* if (sk.family == AF_INET && */
 697                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 698                             offsetof(struct bpf_sock_addr, family)),
 699                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 24),
 700
 701                 /*     (sk.type == SOCK_DGRAM || sk.type == SOCK_STREAM) && */
 702                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 703                             offsetof(struct bpf_sock_addr, type)),
 704                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 1),
 705                 BPF_JMP_A(1),
 706                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_STREAM, 20),
 707
 708                 /*     1st_byte_of_user_ip4 == expected && */
 709                 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
 710                             offsetof(struct bpf_sock_addr, user_ip4)),
 711                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[0], 18),
 712
 713                 /*     2nd_byte_of_user_ip4 == expected && */
 714                 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
 715                             offsetof(struct bpf_sock_addr, user_ip4) + 1),
 716                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[1], 16),
 717
 718                 /*     3rd_byte_of_user_ip4 == expected && */
 719                 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
 720                             offsetof(struct bpf_sock_addr, user_ip4) + 2),
 721                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[2], 14),
 722
 723                 /*     4th_byte_of_user_ip4 == expected && */
 724                 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
 725                             offsetof(struct bpf_sock_addr, user_ip4) + 3),
 726                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[3], 12),
 727
 728                 /*     1st_half_of_user_ip4 == expected && */
 729                 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
 730                             offsetof(struct bpf_sock_addr, user_ip4)),
 731                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[0], 10),
 732
 733                 /*     2nd_half_of_user_ip4 == expected && */
 734                 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
 735                             offsetof(struct bpf_sock_addr, user_ip4) + 2),
 736                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[1], 8),
 737
 738                 /*     whole_user_ip4 == expected) { */
 739                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 740                             offsetof(struct bpf_sock_addr, user_ip4)),
 741                 BPF_LD_IMM64(BPF_REG_8, ip4.u4_addr32), /* See [2]. */
 742                 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 4),
 743
 744                 /*      user_ip4 = addr4_rw.sin_addr */
 745                 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_addr.s_addr),
 746                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 747                             offsetof(struct bpf_sock_addr, user_ip4)),
 748
 749                 /*      user_port = addr4_rw.sin_port */
 750                 BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_port),
 751                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 752                             offsetof(struct bpf_sock_addr, user_port)),
 753                 /* } */
 754
 755                 /* return 1 */
 756                 BPF_MOV64_IMM(BPF_REG_0, 1),
 757                 BPF_EXIT_INSN(),
 758         };
 759
 760         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 761 }
 762
 763 static int bind6_prog_load(const struct sock_addr_test *test)
 764 {
 765         struct sockaddr_in6 addr6_rw;
 766         struct in6_addr ip6;
 767
 768         if (inet_pton(AF_INET6, SERV6_IP, (void *)&ip6) != 1) {
 769                 log_err("Invalid IPv6: %s", SERV6_IP);
 770                 return -1;
 771         }
 772
 773         if (mk_sockaddr(AF_INET6, SERV6_REWRITE_IP, SERV6_REWRITE_PORT,
 774                         (struct sockaddr *)&addr6_rw, sizeof(addr6_rw)) == -1)
 775                 return -1;
 776
 777         /* See [1]. */
 778         struct bpf_insn insns[] = {
 779                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 780
 781                 /* if (sk.family == AF_INET6 && */
 782                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 783                             offsetof(struct bpf_sock_addr, family)),
 784                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
 785
 786                 /*            5th_byte_of_user_ip6 == expected && */
 787                 BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
 788                             offsetof(struct bpf_sock_addr, user_ip6[1])),
 789                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr[4], 16),
 790
 791                 /*            3rd_half_of_user_ip6 == expected && */
 792                 BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
 793                             offsetof(struct bpf_sock_addr, user_ip6[1])),
 794                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr16[2], 14),
 795
 796                 /*            last_word_of_user_ip6 == expected) { */
 797                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 798                             offsetof(struct bpf_sock_addr, user_ip6[3])),
 799                 BPF_LD_IMM64(BPF_REG_8, ip6.s6_addr32[3]),  /* See [2]. */
 800                 BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 10),
 801
 802
 803 #define STORE_IPV6_WORD(N)                                                     \
 804                 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_addr.s6_addr32[N]),     \
 805                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,                       \
 806                             offsetof(struct bpf_sock_addr, user_ip6[N]))
 807
 808                 /*      user_ip6 = addr6_rw.sin6_addr */
 809                 STORE_IPV6_WORD(0),
 810                 STORE_IPV6_WORD(1),
 811                 STORE_IPV6_WORD(2),
 812                 STORE_IPV6_WORD(3),
 813
 814                 /*      user_port = addr6_rw.sin6_port */
 815                 BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_port),
 816                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 817                             offsetof(struct bpf_sock_addr, user_port)),
 818
 819                 /* } */
 820
 821                 /* return 1 */
 822                 BPF_MOV64_IMM(BPF_REG_0, 1),
 823                 BPF_EXIT_INSN(),
 824         };
 825
 826         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 827 }
 828
 829 static int load_path(const struct sock_addr_test *test, const char *path)
 830 {
 831         struct bpf_prog_load_attr attr;
 832         struct bpf_object *obj;
 833         int prog_fd;
 834
 835         memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
 836         attr.file = path;
 837         attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
 838         attr.expected_attach_type = test->expected_attach_type;
 839
 840         if (bpf_prog_load_xattr(&attr, &obj, &prog_fd)) {
 841                 if (test->expected_result != LOAD_REJECT)
 842                         log_err(">>> Loading program (%s) error.\n", path);
 843                 return -1;
 844         }
 845
 846         return prog_fd;
 847 }
 848
 849 static int connect4_prog_load(const struct sock_addr_test *test)
 850 {
 851         return load_path(test, CONNECT4_PROG_PATH);
 852 }
 853
 854 static int connect6_prog_load(const struct sock_addr_test *test)
 855 {
 856         return load_path(test, CONNECT6_PROG_PATH);
 857 }
 858
 859 static int xmsg_ret_only_prog_load(const struct sock_addr_test *test,
 860                                    int32_t rc)
 861 {
 862         struct bpf_insn insns[] = {
 863                 /* return rc */
 864                 BPF_MOV64_IMM(BPF_REG_0, rc),
 865                 BPF_EXIT_INSN(),
 866         };
 867         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 868 }
 869
 870 static int sendmsg_allow_prog_load(const struct sock_addr_test *test)
 871 {
 872         return xmsg_ret_only_prog_load(test, /*rc*/ 1);
 873 }
 874
 875 static int sendmsg_deny_prog_load(const struct sock_addr_test *test)
 876 {
 877         return xmsg_ret_only_prog_load(test, /*rc*/ 0);
 878 }
 879
 880 static int recvmsg_allow_prog_load(const struct sock_addr_test *test)
 881 {
 882         return xmsg_ret_only_prog_load(test, /*rc*/ 1);
 883 }
 884
 885 static int recvmsg_deny_prog_load(const struct sock_addr_test *test)
 886 {
 887         return xmsg_ret_only_prog_load(test, /*rc*/ 0);
 888 }
 889
 890 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
 891 {
 892         struct sockaddr_in dst4_rw_addr;
 893         struct in_addr src4_rw_ip;
 894
 895         if (inet_pton(AF_INET, SRC4_REWRITE_IP, (void *)&src4_rw_ip) != 1) {
 896                 log_err("Invalid IPv4: %s", SRC4_REWRITE_IP);
 897                 return -1;
 898         }
 899
 900         if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
 901                         (struct sockaddr *)&dst4_rw_addr,
 902                         sizeof(dst4_rw_addr)) == -1)
 903                 return -1;
 904
 905         struct bpf_insn insns[] = {
 906                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 907
 908                 /* if (sk.family == AF_INET && */
 909                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 910                             offsetof(struct bpf_sock_addr, family)),
 911                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 8),
 912
 913                 /*     sk.type == SOCK_DGRAM)  { */
 914                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 915                             offsetof(struct bpf_sock_addr, type)),
 916                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 6),
 917
 918                 /*      msg_src_ip4 = src4_rw_ip */
 919                 BPF_MOV32_IMM(BPF_REG_7, src4_rw_ip.s_addr),
 920                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 921                             offsetof(struct bpf_sock_addr, msg_src_ip4)),
 922
 923                 /*      user_ip4 = dst4_rw_addr.sin_addr */
 924                 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_addr.s_addr),
 925                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 926                             offsetof(struct bpf_sock_addr, user_ip4)),
 927
 928                 /*      user_port = dst4_rw_addr.sin_port */
 929                 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_port),
 930                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 931                             offsetof(struct bpf_sock_addr, user_port)),
 932                 /* } */
 933
 934                 /* return 1 */
 935                 BPF_MOV64_IMM(BPF_REG_0, 1),
 936                 BPF_EXIT_INSN(),
 937         };
 938
 939         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 940 }
 941
 942 static int recvmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
 943 {
 944         struct sockaddr_in src4_rw_addr;
 945
 946         if (mk_sockaddr(AF_INET, SERV4_IP, SERV4_PORT,
 947                         (struct sockaddr *)&src4_rw_addr,
 948                         sizeof(src4_rw_addr)) == -1)
 949                 return -1;
 950
 951         struct bpf_insn insns[] = {
 952                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 953
 954                 /* if (sk.family == AF_INET && */
 955                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 956                             offsetof(struct bpf_sock_addr, family)),
 957                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 6),
 958
 959                 /*     sk.type == SOCK_DGRAM)  { */
 960                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 961                             offsetof(struct bpf_sock_addr, type)),
 962                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 4),
 963
 964                 /*      user_ip4 = src4_rw_addr.sin_addr */
 965                 BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_addr.s_addr),
 966                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 967                             offsetof(struct bpf_sock_addr, user_ip4)),
 968
 969                 /*      user_port = src4_rw_addr.sin_port */
 970                 BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_port),
 971                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 972                             offsetof(struct bpf_sock_addr, user_port)),
 973                 /* } */
 974
 975                 /* return 1 */
 976                 BPF_MOV64_IMM(BPF_REG_0, 1),
 977                 BPF_EXIT_INSN(),
 978         };
 979
 980         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 981 }
 982
 983 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test)
 984 {
 985         return load_path(test, SENDMSG4_PROG_PATH);
 986 }
 987
 988 static int sendmsg6_rw_dst_asm_prog_load(const struct sock_addr_test *test,
 989                                          const char *rw_dst_ip)
 990 {
 991         struct sockaddr_in6 dst6_rw_addr;
 992         struct in6_addr src6_rw_ip;
 993
 994         if (inet_pton(AF_INET6, SRC6_REWRITE_IP, (void *)&src6_rw_ip) != 1) {
 995                 log_err("Invalid IPv6: %s", SRC6_REWRITE_IP);
 996                 return -1;
 997         }
 998
 999         if (mk_sockaddr(AF_INET6, rw_dst_ip, SERV6_REWRITE_PORT,
1000                         (struct sockaddr *)&dst6_rw_addr,
1001                         sizeof(dst6_rw_addr)) == -1)
1002                 return -1;
1003
1004         struct bpf_insn insns[] = {
1005                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
1006
1007                 /* if (sk.family == AF_INET6) { */
1008                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
1009                             offsetof(struct bpf_sock_addr, family)),
1010                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
1011
1012 #define STORE_IPV6_WORD_N(DST, SRC, N)                                         \
1013                 BPF_MOV32_IMM(BPF_REG_7, SRC[N]),                              \
1014                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,                       \
1015                             offsetof(struct bpf_sock_addr, DST[N]))
1016
1017 #define STORE_IPV6(DST, SRC)                                                   \
1018                 STORE_IPV6_WORD_N(DST, SRC, 0),                                \
1019                 STORE_IPV6_WORD_N(DST, SRC, 1),                                \
1020                 STORE_IPV6_WORD_N(DST, SRC, 2),                                \
1021                 STORE_IPV6_WORD_N(DST, SRC, 3)
1022
1023                 STORE_IPV6(msg_src_ip6, src6_rw_ip.s6_addr32),
1024                 STORE_IPV6(user_ip6, dst6_rw_addr.sin6_addr.s6_addr32),
1025
1026                 /*      user_port = dst6_rw_addr.sin6_port */
1027                 BPF_MOV32_IMM(BPF_REG_7, dst6_rw_addr.sin6_port),
1028                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
1029                             offsetof(struct bpf_sock_addr, user_port)),
1030
1031                 /* } */
1032
1033                 /* return 1 */
1034                 BPF_MOV64_IMM(BPF_REG_0, 1),
1035                 BPF_EXIT_INSN(),
1036         };
1037
1038         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
1039 }
1040
1041 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
1042 {
1043         return sendmsg6_rw_dst_asm_prog_load(test, SERV6_REWRITE_IP);
1044 }
1045
1046 static int recvmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
1047 {
1048         struct sockaddr_in6 src6_rw_addr;
1049
1050         if (mk_sockaddr(AF_INET6, SERV6_IP, SERV6_PORT,
1051                         (struct sockaddr *)&src6_rw_addr,
1052                         sizeof(src6_rw_addr)) == -1)
1053                 return -1;
1054
1055         struct bpf_insn insns[] = {
1056                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
1057
1058                 /* if (sk.family == AF_INET6) { */
1059                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
1060                             offsetof(struct bpf_sock_addr, family)),
1061                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 10),
1062
1063                 STORE_IPV6(user_ip6, src6_rw_addr.sin6_addr.s6_addr32),
1064
1065                 /*      user_port = dst6_rw_addr.sin6_port */
1066                 BPF_MOV32_IMM(BPF_REG_7, src6_rw_addr.sin6_port),
1067                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
1068                             offsetof(struct bpf_sock_addr, user_port)),
1069                 /* } */
1070
1071                 /* return 1 */
1072                 BPF_MOV64_IMM(BPF_REG_0, 1),
1073                 BPF_EXIT_INSN(),
1074         };
1075
1076         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
1077 }
1078
1079 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test)
1080 {
1081         return sendmsg6_rw_dst_asm_prog_load(test, SERV6_V4MAPPED_IP);
1082 }
1083
1084 static int sendmsg6_rw_wildcard_prog_load(const struct sock_addr_test *test)
1085 {
1086         return sendmsg6_rw_dst_asm_prog_load(test, WILDCARD6_IP);
1087 }
1088
1089 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test)
1090 {
1091         return load_path(test, SENDMSG6_PROG_PATH);
1092 }
1093
1094 static int cmp_addr(const struct sockaddr_storage *addr1,
1095                     const struct sockaddr_storage *addr2, int cmp_port)
1096 {
1097         const struct sockaddr_in *four1, *four2;
1098         const struct sockaddr_in6 *six1, *six2;
1099
1100         if (addr1->ss_family != addr2->ss_family)
1101                 return -1;
1102
1103         if (addr1->ss_family == AF_INET) {
1104                 four1 = (const struct sockaddr_in *)addr1;
1105                 four2 = (const struct sockaddr_in *)addr2;
1106                 return !((four1->sin_port == four2->sin_port || !cmp_port) &&
1107                          four1->sin_addr.s_addr == four2->sin_addr.s_addr);
1108         } else if (addr1->ss_family == AF_INET6) {
1109                 six1 = (const struct sockaddr_in6 *)addr1;
1110                 six2 = (const struct sockaddr_in6 *)addr2;
1111                 return !((six1->sin6_port == six2->sin6_port || !cmp_port) &&
1112                          !memcmp(&six1->sin6_addr, &six2->sin6_addr,
1113                                  sizeof(struct in6_addr)));
1114         }
1115
1116         return -1;
1117 }
1118
1119 static int cmp_sock_addr(info_fn fn, int sock1,
1120                          const struct sockaddr_storage *addr2, int cmp_port)
1121 {
1122         struct sockaddr_storage addr1;
1123         socklen_t len1 = sizeof(addr1);
1124
1125         memset(&addr1, 0, len1);
1126         if (fn(sock1, (struct sockaddr *)&addr1, (socklen_t *)&len1) != 0)
1127                 return -1;
1128
1129         return cmp_addr(&addr1, addr2, cmp_port);
1130 }
1131
1132 static int cmp_local_ip(int sock1, const struct sockaddr_storage *addr2)
1133 {
1134         return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 0);
1135 }
1136
1137 static int cmp_local_addr(int sock1, const struct sockaddr_storage *addr2)
1138 {
1139         return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 1);
1140 }
1141
1142 static int cmp_peer_addr(int sock1, const struct sockaddr_storage *addr2)
1143 {
1144         return cmp_sock_addr(getpeername, sock1, addr2, /*cmp_port*/ 1);
1145 }
1146
1147 static int start_server(int type, const struct sockaddr_storage *addr,
1148                         socklen_t addr_len)
1149 {
1150         int fd;
1151
1152         fd = socket(addr->ss_family, type, 0);
1153         if (fd == -1) {
1154                 log_err("Failed to create server socket");
1155                 goto out;
1156         }
1157
1158         if (bind(fd, (const struct sockaddr *)addr, addr_len) == -1) {
1159                 log_err("Failed to bind server socket");
1160                 goto close_out;
1161         }
1162
1163         if (type == SOCK_STREAM) {
1164                 if (listen(fd, 128) == -1) {
1165                         log_err("Failed to listen on server socket");
1166                         goto close_out;
1167                 }
1168         }
1169
1170         goto out;
1171 close_out:
1172         close(fd);
1173         fd = -1;
1174 out:
1175         return fd;
1176 }
1177
1178 static int connect_to_server(int type, const struct sockaddr_storage *addr,
1179                              socklen_t addr_len)
1180 {
1181         int domain;
1182         int fd = -1;
1183
1184         domain = addr->ss_family;
1185
1186         if (domain != AF_INET && domain != AF_INET6) {
1187                 log_err("Unsupported address family");
1188                 goto err;
1189         }
1190
1191         fd = socket(domain, type, 0);
1192         if (fd == -1) {
1193                 log_err("Failed to create client socket");
1194                 goto err;
1195         }
1196
1197         if (connect(fd, (const struct sockaddr *)addr, addr_len) == -1) {
1198                 log_err("Fail to connect to server");
1199                 goto err;
1200         }
1201
1202         goto out;
1203 err:
1204         close(fd);
1205         fd = -1;
1206 out:
1207         return fd;
1208 }
1209
1210 int init_pktinfo(int domain, struct cmsghdr *cmsg)
1211 {
1212         struct in6_pktinfo *pktinfo6;
1213         struct in_pktinfo *pktinfo4;
1214
1215         if (domain == AF_INET) {
1216                 cmsg->cmsg_level = SOL_IP;
1217                 cmsg->cmsg_type = IP_PKTINFO;
1218                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
1219                 pktinfo4 = (struct in_pktinfo *)CMSG_DATA(cmsg);
1220                 memset(pktinfo4, 0, sizeof(struct in_pktinfo));
1221                 if (inet_pton(domain, SRC4_IP,
1222                               (void *)&pktinfo4->ipi_spec_dst) != 1)
1223                         return -1;
1224         } else if (domain == AF_INET6) {
1225                 cmsg->cmsg_level = SOL_IPV6;
1226                 cmsg->cmsg_type = IPV6_PKTINFO;
1227                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1228                 pktinfo6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
1229                 memset(pktinfo6, 0, sizeof(struct in6_pktinfo));
1230                 if (inet_pton(domain, SRC6_IP,
1231                               (void *)&pktinfo6->ipi6_addr) != 1)
1232                         return -1;
1233         } else {
1234                 return -1;
1235         }
1236
1237         return 0;
1238 }
1239
1240 static int sendmsg_to_server(int type, const struct sockaddr_storage *addr,
1241                              socklen_t addr_len, int set_cmsg, int flags,
1242                              int *syscall_err)
1243 {
1244         union {
1245                 char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
1246                 struct cmsghdr align;
1247         } control6;
1248         union {
1249                 char buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
1250                 struct cmsghdr align;
1251         } control4;
1252         struct msghdr hdr;
1253         struct iovec iov;
1254         char data = 'a';
1255         int domain;
1256         int fd = -1;
1257
1258         domain = addr->ss_family;
1259
1260         if (domain != AF_INET && domain != AF_INET6) {
1261                 log_err("Unsupported address family");
1262                 goto err;
1263         }
1264
1265         fd = socket(domain, type, 0);
1266         if (fd == -1) {
1267                 log_err("Failed to create client socket");
1268                 goto err;
1269         }
1270
1271         memset(&iov, 0, sizeof(iov));
1272         iov.iov_base = &data;
1273         iov.iov_len = sizeof(data);
1274
1275         memset(&hdr, 0, sizeof(hdr));
1276         hdr.msg_name = (void *)addr;
1277         hdr.msg_namelen = addr_len;
1278         hdr.msg_iov = &iov;
1279         hdr.msg_iovlen = 1;
1280
1281         if (set_cmsg) {
1282                 if (domain == AF_INET) {
1283                         hdr.msg_control = &control4;
1284                         hdr.msg_controllen = sizeof(control4.buf);
1285                 } else if (domain == AF_INET6) {
1286                         hdr.msg_control = &control6;
1287                         hdr.msg_controllen = sizeof(control6.buf);
1288                 }
1289                 if (init_pktinfo(domain, CMSG_FIRSTHDR(&hdr))) {
1290                         log_err("Fail to init pktinfo");
1291                         goto err;
1292                 }
1293         }
1294
1295         if (sendmsg(fd, &hdr, flags) != sizeof(data)) {
1296                 log_err("Fail to send message to server");
1297                 *syscall_err = errno;
1298                 goto err;
1299         }
1300
1301         goto out;
1302 err:
1303         close(fd);
1304         fd = -1;
1305 out:
1306         return fd;
1307 }
1308
1309 static int fastconnect_to_server(const struct sockaddr_storage *addr,
1310                                  socklen_t addr_len)
1311 {
1312         int sendmsg_err;
1313
1314         return sendmsg_to_server(SOCK_STREAM, addr, addr_len, /*set_cmsg*/0,
1315                                  MSG_FASTOPEN, &sendmsg_err);
1316 }
1317
1318 static int recvmsg_from_client(int sockfd, struct sockaddr_storage *src_addr)
1319 {
1320         struct timeval tv;
1321         struct msghdr hdr;
1322         struct iovec iov;
1323         char data[64];
1324         fd_set rfds;
1325
1326         FD_ZERO(&rfds);
1327         FD_SET(sockfd, &rfds);
1328
1329         tv.tv_sec = 2;
1330         tv.tv_usec = 0;
1331
1332         if (select(sockfd + 1, &rfds, NULL, NULL, &tv) <= 0 ||
1333             !FD_ISSET(sockfd, &rfds))
1334                 return -1;
1335
1336         memset(&iov, 0, sizeof(iov));
1337         iov.iov_base = data;
1338         iov.iov_len = sizeof(data);
1339
1340         memset(&hdr, 0, sizeof(hdr));
1341         hdr.msg_name = src_addr;
1342         hdr.msg_namelen = sizeof(struct sockaddr_storage);
1343         hdr.msg_iov = &iov;
1344         hdr.msg_iovlen = 1;
1345
1346         return recvmsg(sockfd, &hdr, 0);
1347 }
1348
1349 static int init_addrs(const struct sock_addr_test *test,
1350                       struct sockaddr_storage *requested_addr,
1351                       struct sockaddr_storage *expected_addr,
1352                       struct sockaddr_storage *expected_src_addr)
1353 {
1354         socklen_t addr_len = sizeof(struct sockaddr_storage);
1355
1356         if (mk_sockaddr(test->domain, test->expected_ip, test->expected_port,
1357                         (struct sockaddr *)expected_addr, addr_len) == -1)
1358                 goto err;
1359
1360         if (mk_sockaddr(test->domain, test->requested_ip, test->requested_port,
1361                         (struct sockaddr *)requested_addr, addr_len) == -1)
1362                 goto err;
1363
1364         if (test->expected_src_ip &&
1365             mk_sockaddr(test->domain, test->expected_src_ip, 0,
1366                         (struct sockaddr *)expected_src_addr, addr_len) == -1)
1367                 goto err;
1368
1369         return 0;
1370 err:
1371         return -1;
1372 }
1373
1374 static int run_bind_test_case(const struct sock_addr_test *test)
1375 {
1376         socklen_t addr_len = sizeof(struct sockaddr_storage);
1377         struct sockaddr_storage requested_addr;
1378         struct sockaddr_storage expected_addr;
1379         int clientfd = -1;
1380         int servfd = -1;
1381         int err = 0;
1382
1383         if (init_addrs(test, &requested_addr, &expected_addr, NULL))
1384                 goto err;
1385
1386         servfd = start_server(test->type, &requested_addr, addr_len);
1387         if (servfd == -1)
1388                 goto err;
1389
1390         if (cmp_local_addr(servfd, &expected_addr))
1391                 goto err;
1392
1393         /* Try to connect to server just in case */
1394         clientfd = connect_to_server(test->type, &expected_addr, addr_len);
1395         if (clientfd == -1)
1396                 goto err;
1397
1398         goto out;
1399 err:
1400         err = -1;
1401 out:
1402         close(clientfd);
1403         close(servfd);
1404         return err;
1405 }
1406
1407 static int run_connect_test_case(const struct sock_addr_test *test)
1408 {
1409         socklen_t addr_len = sizeof(struct sockaddr_storage);
1410         struct sockaddr_storage expected_src_addr;
1411         struct sockaddr_storage requested_addr;
1412         struct sockaddr_storage expected_addr;
1413         int clientfd = -1;
1414         int servfd = -1;
1415         int err = 0;
1416
1417         if (init_addrs(test, &requested_addr, &expected_addr,
1418                        &expected_src_addr))
1419                 goto err;
1420
1421         /* Prepare server to connect to */
1422         servfd = start_server(test->type, &expected_addr, addr_len);
1423         if (servfd == -1)
1424                 goto err;
1425
1426         clientfd = connect_to_server(test->type, &requested_addr, addr_len);
1427         if (clientfd == -1)
1428                 goto err;
1429
1430         /* Make sure src and dst addrs were overridden properly */
1431         if (cmp_peer_addr(clientfd, &expected_addr))
1432                 goto err;
1433
1434         if (cmp_local_ip(clientfd, &expected_src_addr))
1435                 goto err;
1436
1437         if (test->type == SOCK_STREAM) {
1438                 /* Test TCP Fast Open scenario */
1439                 clientfd = fastconnect_to_server(&requested_addr, addr_len);
1440                 if (clientfd == -1)
1441                         goto err;
1442
1443                 /* Make sure src and dst addrs were overridden properly */
1444                 if (cmp_peer_addr(clientfd, &expected_addr))
1445                         goto err;
1446
1447                 if (cmp_local_ip(clientfd, &expected_src_addr))
1448                         goto err;
1449         }
1450
1451         goto out;
1452 err:
1453         err = -1;
1454 out:
1455         close(clientfd);
1456         close(servfd);
1457         return err;
1458 }
1459
1460 static int run_xmsg_test_case(const struct sock_addr_test *test, int max_cmsg)
1461 {
1462         socklen_t addr_len = sizeof(struct sockaddr_storage);
1463         struct sockaddr_storage expected_addr;
1464         struct sockaddr_storage server_addr;
1465         struct sockaddr_storage sendmsg_addr;
1466         struct sockaddr_storage recvmsg_addr;
1467         int clientfd = -1;
1468         int servfd = -1;
1469         int set_cmsg;
1470         int err = 0;
1471
1472         if (test->type != SOCK_DGRAM)
1473                 goto err;
1474
1475         if (init_addrs(test, &sendmsg_addr, &server_addr, &expected_addr))
1476                 goto err;
1477
1478         /* Prepare server to sendmsg to */
1479         servfd = start_server(test->type, &server_addr, addr_len);
1480         if (servfd == -1)
1481                 goto err;
1482
1483         for (set_cmsg = 0; set_cmsg <= max_cmsg; ++set_cmsg) {
1484                 if (clientfd >= 0)
1485                         close(clientfd);
1486
1487                 clientfd = sendmsg_to_server(test->type, &sendmsg_addr,
1488                                              addr_len, set_cmsg, /*flags*/0,
1489                                              &err);
1490                 if (err)
1491                         goto out;
1492                 else if (clientfd == -1)
1493                         goto err;
1494
1495                 /* Try to receive message on server instead of using
1496                  * getpeername(2) on client socket, to check that client's
1497                  * destination address was rewritten properly, since
1498                  * getpeername(2) doesn't work with unconnected datagram
1499                  * sockets.
1500                  *
1501                  * Get source address from recvmsg(2) as well to make sure
1502                  * source was rewritten properly: getsockname(2) can't be used
1503                  * since socket is unconnected and source defined for one
1504                  * specific packet may differ from the one used by default and
1505                  * returned by getsockname(2).
1506                  */
1507                 if (recvmsg_from_client(servfd, &recvmsg_addr) == -1)
1508                         goto err;
1509
1510                 if (cmp_addr(&recvmsg_addr, &expected_addr, /*cmp_port*/0))
1511                         goto err;
1512         }
1513
1514         goto out;
1515 err:
1516         err = -1;
1517 out:
1518         close(clientfd);
1519         close(servfd);
1520         return err;
1521 }
1522
1523 static int run_test_case(int cgfd, const struct sock_addr_test *test)
1524 {
1525         int progfd = -1;
1526         int err = 0;
1527
1528         printf("Test case: %s .. ", test->descr);
1529
1530         progfd = test->loadfn(test);
1531         if (test->expected_result == LOAD_REJECT && progfd < 0)
1532                 goto out;
1533         else if (test->expected_result == LOAD_REJECT || progfd < 0)
1534                 goto err;
1535
1536         err = bpf_prog_attach(progfd, cgfd, test->attach_type,
1537                               BPF_F_ALLOW_OVERRIDE);
1538         if (test->expected_result == ATTACH_REJECT && err) {
1539                 err = 0; /* error was expected, reset it */
1540                 goto out;
1541         } else if (test->expected_result == ATTACH_REJECT || err) {
1542                 goto err;
1543         } else if (test->expected_result == ATTACH_OKAY) {
1544                 err = 0;
1545                 goto out;
1546         }
1547
1548         switch (test->attach_type) {
1549         case BPF_CGROUP_INET4_BIND:
1550         case BPF_CGROUP_INET6_BIND:
1551                 err = run_bind_test_case(test);
1552                 break;
1553         case BPF_CGROUP_INET4_CONNECT:
1554         case BPF_CGROUP_INET6_CONNECT:
1555                 err = run_connect_test_case(test);
1556                 break;
1557         case BPF_CGROUP_UDP4_SENDMSG:
1558         case BPF_CGROUP_UDP6_SENDMSG:
1559                 err = run_xmsg_test_case(test, 1);
1560                 break;
1561         case BPF_CGROUP_UDP4_RECVMSG:
1562         case BPF_CGROUP_UDP6_RECVMSG:
1563                 err = run_xmsg_test_case(test, 0);
1564                 break;
1565         default:
1566                 goto err;
1567         }
1568
1569         if (test->expected_result == SYSCALL_EPERM && err == EPERM) {
1570                 err = 0; /* error was expected, reset it */
1571                 goto out;
1572         }
1573
1574         if (test->expected_result == SYSCALL_ENOTSUPP && err == ENOTSUPP) {
1575                 err = 0; /* error was expected, reset it */
1576                 goto out;
1577         }
1578
1579         if (err || test->expected_result != SUCCESS)
1580                 goto err;
1581
1582         goto out;
1583 err:
1584         err = -1;
1585 out:
1586         /* Detaching w/o checking return code: best effort attempt. */
1587         if (progfd != -1)
1588                 bpf_prog_detach(cgfd, test->attach_type);
1589         close(progfd);
1590         printf("[%s]\n", err ? "FAIL" : "PASS");
1591         return err;
1592 }
1593
1594 static int run_tests(int cgfd)
1595 {
1596         int passes = 0;
1597         int fails = 0;
1598         int i;
1599
1600         for (i = 0; i < ARRAY_SIZE(tests); ++i) {
1601                 if (run_test_case(cgfd, &tests[i]))
1602                         ++fails;
1603                 else
1604                         ++passes;
1605         }
1606         printf("Summary: %d PASSED, %d FAILED\n", passes, fails);
1607         return fails ? -1 : 0;
1608 }
1609
1610 int main(int argc, char **argv)
1611 {
1612         int cgfd = -1;
1613         int err = 0;
1614
1615         if (argc < 2) {
1616                 fprintf(stderr,
1617                         "%s has to be run via %s.sh. Skip direct run.\n",
1618                         argv[0], argv[0]);
1619                 exit(err);
1620         }
1621
1622         if (setup_cgroup_environment())
1623                 goto err;
1624
1625         cgfd = create_and_get_cgroup(CG_PATH);
1626         if (cgfd < 0)
1627                 goto err;
1628
1629         if (join_cgroup(CG_PATH))
1630                 goto err;
1631
1632         if (run_tests(cgfd))
1633                 goto err;
1634
1635         goto out;
1636 err:
1637         err = -1;
1638 out:
1639         close(cgfd);
1640         cleanup_cgroup_environment();
1641         return err;
1642 }