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         attr.prog_flags = BPF_F_TEST_RND_HI32;
 840
 841         if (bpf_prog_load_xattr(&attr, &obj, &prog_fd)) {
 842                 if (test->expected_result != LOAD_REJECT)
 843                         log_err(">>> Loading program (%s) error.\n", path);
 844                 return -1;
 845         }
 846
 847         return prog_fd;
 848 }
 849
 850 static int connect4_prog_load(const struct sock_addr_test *test)
 851 {
 852         return load_path(test, CONNECT4_PROG_PATH);
 853 }
 854
 855 static int connect6_prog_load(const struct sock_addr_test *test)
 856 {
 857         return load_path(test, CONNECT6_PROG_PATH);
 858 }
 859
 860 static int xmsg_ret_only_prog_load(const struct sock_addr_test *test,
 861                                    int32_t rc)
 862 {
 863         struct bpf_insn insns[] = {
 864                 /* return rc */
 865                 BPF_MOV64_IMM(BPF_REG_0, rc),
 866                 BPF_EXIT_INSN(),
 867         };
 868         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 869 }
 870
 871 static int sendmsg_allow_prog_load(const struct sock_addr_test *test)
 872 {
 873         return xmsg_ret_only_prog_load(test, /*rc*/ 1);
 874 }
 875
 876 static int sendmsg_deny_prog_load(const struct sock_addr_test *test)
 877 {
 878         return xmsg_ret_only_prog_load(test, /*rc*/ 0);
 879 }
 880
 881 static int recvmsg_allow_prog_load(const struct sock_addr_test *test)
 882 {
 883         return xmsg_ret_only_prog_load(test, /*rc*/ 1);
 884 }
 885
 886 static int recvmsg_deny_prog_load(const struct sock_addr_test *test)
 887 {
 888         return xmsg_ret_only_prog_load(test, /*rc*/ 0);
 889 }
 890
 891 static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
 892 {
 893         struct sockaddr_in dst4_rw_addr;
 894         struct in_addr src4_rw_ip;
 895
 896         if (inet_pton(AF_INET, SRC4_REWRITE_IP, (void *)&src4_rw_ip) != 1) {
 897                 log_err("Invalid IPv4: %s", SRC4_REWRITE_IP);
 898                 return -1;
 899         }
 900
 901         if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
 902                         (struct sockaddr *)&dst4_rw_addr,
 903                         sizeof(dst4_rw_addr)) == -1)
 904                 return -1;
 905
 906         struct bpf_insn insns[] = {
 907                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 908
 909                 /* if (sk.family == AF_INET && */
 910                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 911                             offsetof(struct bpf_sock_addr, family)),
 912                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 8),
 913
 914                 /*     sk.type == SOCK_DGRAM)  { */
 915                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 916                             offsetof(struct bpf_sock_addr, type)),
 917                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 6),
 918
 919                 /*      msg_src_ip4 = src4_rw_ip */
 920                 BPF_MOV32_IMM(BPF_REG_7, src4_rw_ip.s_addr),
 921                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 922                             offsetof(struct bpf_sock_addr, msg_src_ip4)),
 923
 924                 /*      user_ip4 = dst4_rw_addr.sin_addr */
 925                 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_addr.s_addr),
 926                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 927                             offsetof(struct bpf_sock_addr, user_ip4)),
 928
 929                 /*      user_port = dst4_rw_addr.sin_port */
 930                 BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_port),
 931                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 932                             offsetof(struct bpf_sock_addr, user_port)),
 933                 /* } */
 934
 935                 /* return 1 */
 936                 BPF_MOV64_IMM(BPF_REG_0, 1),
 937                 BPF_EXIT_INSN(),
 938         };
 939
 940         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 941 }
 942
 943 static int recvmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
 944 {
 945         struct sockaddr_in src4_rw_addr;
 946
 947         if (mk_sockaddr(AF_INET, SERV4_IP, SERV4_PORT,
 948                         (struct sockaddr *)&src4_rw_addr,
 949                         sizeof(src4_rw_addr)) == -1)
 950                 return -1;
 951
 952         struct bpf_insn insns[] = {
 953                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
 954
 955                 /* if (sk.family == AF_INET && */
 956                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 957                             offsetof(struct bpf_sock_addr, family)),
 958                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 6),
 959
 960                 /*     sk.type == SOCK_DGRAM)  { */
 961                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
 962                             offsetof(struct bpf_sock_addr, type)),
 963                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 4),
 964
 965                 /*      user_ip4 = src4_rw_addr.sin_addr */
 966                 BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_addr.s_addr),
 967                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 968                             offsetof(struct bpf_sock_addr, user_ip4)),
 969
 970                 /*      user_port = src4_rw_addr.sin_port */
 971                 BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_port),
 972                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
 973                             offsetof(struct bpf_sock_addr, user_port)),
 974                 /* } */
 975
 976                 /* return 1 */
 977                 BPF_MOV64_IMM(BPF_REG_0, 1),
 978                 BPF_EXIT_INSN(),
 979         };
 980
 981         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
 982 }
 983
 984 static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test)
 985 {
 986         return load_path(test, SENDMSG4_PROG_PATH);
 987 }
 988
 989 static int sendmsg6_rw_dst_asm_prog_load(const struct sock_addr_test *test,
 990                                          const char *rw_dst_ip)
 991 {
 992         struct sockaddr_in6 dst6_rw_addr;
 993         struct in6_addr src6_rw_ip;
 994
 995         if (inet_pton(AF_INET6, SRC6_REWRITE_IP, (void *)&src6_rw_ip) != 1) {
 996                 log_err("Invalid IPv6: %s", SRC6_REWRITE_IP);
 997                 return -1;
 998         }
 999
1000         if (mk_sockaddr(AF_INET6, rw_dst_ip, SERV6_REWRITE_PORT,
1001                         (struct sockaddr *)&dst6_rw_addr,
1002                         sizeof(dst6_rw_addr)) == -1)
1003                 return -1;
1004
1005         struct bpf_insn insns[] = {
1006                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
1007
1008                 /* if (sk.family == AF_INET6) { */
1009                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
1010                             offsetof(struct bpf_sock_addr, family)),
1011                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
1012
1013 #define STORE_IPV6_WORD_N(DST, SRC, N)                                         \
1014                 BPF_MOV32_IMM(BPF_REG_7, SRC[N]),                              \
1015                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,                       \
1016                             offsetof(struct bpf_sock_addr, DST[N]))
1017
1018 #define STORE_IPV6(DST, SRC)                                                   \
1019                 STORE_IPV6_WORD_N(DST, SRC, 0),                                \
1020                 STORE_IPV6_WORD_N(DST, SRC, 1),                                \
1021                 STORE_IPV6_WORD_N(DST, SRC, 2),                                \
1022                 STORE_IPV6_WORD_N(DST, SRC, 3)
1023
1024                 STORE_IPV6(msg_src_ip6, src6_rw_ip.s6_addr32),
1025                 STORE_IPV6(user_ip6, dst6_rw_addr.sin6_addr.s6_addr32),
1026
1027                 /*      user_port = dst6_rw_addr.sin6_port */
1028                 BPF_MOV32_IMM(BPF_REG_7, dst6_rw_addr.sin6_port),
1029                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
1030                             offsetof(struct bpf_sock_addr, user_port)),
1031
1032                 /* } */
1033
1034                 /* return 1 */
1035                 BPF_MOV64_IMM(BPF_REG_0, 1),
1036                 BPF_EXIT_INSN(),
1037         };
1038
1039         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
1040 }
1041
1042 static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
1043 {
1044         return sendmsg6_rw_dst_asm_prog_load(test, SERV6_REWRITE_IP);
1045 }
1046
1047 static int recvmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
1048 {
1049         struct sockaddr_in6 src6_rw_addr;
1050
1051         if (mk_sockaddr(AF_INET6, SERV6_IP, SERV6_PORT,
1052                         (struct sockaddr *)&src6_rw_addr,
1053                         sizeof(src6_rw_addr)) == -1)
1054                 return -1;
1055
1056         struct bpf_insn insns[] = {
1057                 BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
1058
1059                 /* if (sk.family == AF_INET6) { */
1060                 BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
1061                             offsetof(struct bpf_sock_addr, family)),
1062                 BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 10),
1063
1064                 STORE_IPV6(user_ip6, src6_rw_addr.sin6_addr.s6_addr32),
1065
1066                 /*      user_port = dst6_rw_addr.sin6_port */
1067                 BPF_MOV32_IMM(BPF_REG_7, src6_rw_addr.sin6_port),
1068                 BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
1069                             offsetof(struct bpf_sock_addr, user_port)),
1070                 /* } */
1071
1072                 /* return 1 */
1073                 BPF_MOV64_IMM(BPF_REG_0, 1),
1074                 BPF_EXIT_INSN(),
1075         };
1076
1077         return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
1078 }
1079
1080 static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test)
1081 {
1082         return sendmsg6_rw_dst_asm_prog_load(test, SERV6_V4MAPPED_IP);
1083 }
1084
1085 static int sendmsg6_rw_wildcard_prog_load(const struct sock_addr_test *test)
1086 {
1087         return sendmsg6_rw_dst_asm_prog_load(test, WILDCARD6_IP);
1088 }
1089
1090 static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test)
1091 {
1092         return load_path(test, SENDMSG6_PROG_PATH);
1093 }
1094
1095 static int cmp_addr(const struct sockaddr_storage *addr1,
1096                     const struct sockaddr_storage *addr2, int cmp_port)
1097 {
1098         const struct sockaddr_in *four1, *four2;
1099         const struct sockaddr_in6 *six1, *six2;
1100
1101         if (addr1->ss_family != addr2->ss_family)
1102                 return -1;
1103
1104         if (addr1->ss_family == AF_INET) {
1105                 four1 = (const struct sockaddr_in *)addr1;
1106                 four2 = (const struct sockaddr_in *)addr2;
1107                 return !((four1->sin_port == four2->sin_port || !cmp_port) &&
1108                          four1->sin_addr.s_addr == four2->sin_addr.s_addr);
1109         } else if (addr1->ss_family == AF_INET6) {
1110                 six1 = (const struct sockaddr_in6 *)addr1;
1111                 six2 = (const struct sockaddr_in6 *)addr2;
1112                 return !((six1->sin6_port == six2->sin6_port || !cmp_port) &&
1113                          !memcmp(&six1->sin6_addr, &six2->sin6_addr,
1114                                  sizeof(struct in6_addr)));
1115         }
1116
1117         return -1;
1118 }
1119
1120 static int cmp_sock_addr(info_fn fn, int sock1,
1121                          const struct sockaddr_storage *addr2, int cmp_port)
1122 {
1123         struct sockaddr_storage addr1;
1124         socklen_t len1 = sizeof(addr1);
1125
1126         memset(&addr1, 0, len1);
1127         if (fn(sock1, (struct sockaddr *)&addr1, (socklen_t *)&len1) != 0)
1128                 return -1;
1129
1130         return cmp_addr(&addr1, addr2, cmp_port);
1131 }
1132
1133 static int cmp_local_ip(int sock1, const struct sockaddr_storage *addr2)
1134 {
1135         return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 0);
1136 }
1137
1138 static int cmp_local_addr(int sock1, const struct sockaddr_storage *addr2)
1139 {
1140         return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 1);
1141 }
1142
1143 static int cmp_peer_addr(int sock1, const struct sockaddr_storage *addr2)
1144 {
1145         return cmp_sock_addr(getpeername, sock1, addr2, /*cmp_port*/ 1);
1146 }
1147
1148 static int start_server(int type, const struct sockaddr_storage *addr,
1149                         socklen_t addr_len)
1150 {
1151         int fd;
1152
1153         fd = socket(addr->ss_family, type, 0);
1154         if (fd == -1) {
1155                 log_err("Failed to create server socket");
1156                 goto out;
1157         }
1158
1159         if (bind(fd, (const struct sockaddr *)addr, addr_len) == -1) {
1160                 log_err("Failed to bind server socket");
1161                 goto close_out;
1162         }
1163
1164         if (type == SOCK_STREAM) {
1165                 if (listen(fd, 128) == -1) {
1166                         log_err("Failed to listen on server socket");
1167                         goto close_out;
1168                 }
1169         }
1170
1171         goto out;
1172 close_out:
1173         close(fd);
1174         fd = -1;
1175 out:
1176         return fd;
1177 }
1178
1179 static int connect_to_server(int type, const struct sockaddr_storage *addr,
1180                              socklen_t addr_len)
1181 {
1182         int domain;
1183         int fd = -1;
1184
1185         domain = addr->ss_family;
1186
1187         if (domain != AF_INET && domain != AF_INET6) {
1188                 log_err("Unsupported address family");
1189                 goto err;
1190         }
1191
1192         fd = socket(domain, type, 0);
1193         if (fd == -1) {
1194                 log_err("Failed to create client socket");
1195                 goto err;
1196         }
1197
1198         if (connect(fd, (const struct sockaddr *)addr, addr_len) == -1) {
1199                 log_err("Fail to connect to server");
1200                 goto err;
1201         }
1202
1203         goto out;
1204 err:
1205         close(fd);
1206         fd = -1;
1207 out:
1208         return fd;
1209 }
1210
1211 int init_pktinfo(int domain, struct cmsghdr *cmsg)
1212 {
1213         struct in6_pktinfo *pktinfo6;
1214         struct in_pktinfo *pktinfo4;
1215
1216         if (domain == AF_INET) {
1217                 cmsg->cmsg_level = SOL_IP;
1218                 cmsg->cmsg_type = IP_PKTINFO;
1219                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
1220                 pktinfo4 = (struct in_pktinfo *)CMSG_DATA(cmsg);
1221                 memset(pktinfo4, 0, sizeof(struct in_pktinfo));
1222                 if (inet_pton(domain, SRC4_IP,
1223                               (void *)&pktinfo4->ipi_spec_dst) != 1)
1224                         return -1;
1225         } else if (domain == AF_INET6) {
1226                 cmsg->cmsg_level = SOL_IPV6;
1227                 cmsg->cmsg_type = IPV6_PKTINFO;
1228                 cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1229                 pktinfo6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
1230                 memset(pktinfo6, 0, sizeof(struct in6_pktinfo));
1231                 if (inet_pton(domain, SRC6_IP,
1232                               (void *)&pktinfo6->ipi6_addr) != 1)
1233                         return -1;
1234         } else {
1235                 return -1;
1236         }
1237
1238         return 0;
1239 }
1240
1241 static int sendmsg_to_server(int type, const struct sockaddr_storage *addr,
1242                              socklen_t addr_len, int set_cmsg, int flags,
1243                              int *syscall_err)
1244 {
1245         union {
1246                 char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
1247                 struct cmsghdr align;
1248         } control6;
1249         union {
1250                 char buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
1251                 struct cmsghdr align;
1252         } control4;
1253         struct msghdr hdr;
1254         struct iovec iov;
1255         char data = 'a';
1256         int domain;
1257         int fd = -1;
1258
1259         domain = addr->ss_family;
1260
1261         if (domain != AF_INET && domain != AF_INET6) {
1262                 log_err("Unsupported address family");
1263                 goto err;
1264         }
1265
1266         fd = socket(domain, type, 0);
1267         if (fd == -1) {
1268                 log_err("Failed to create client socket");
1269                 goto err;
1270         }
1271
1272         memset(&iov, 0, sizeof(iov));
1273         iov.iov_base = &data;
1274         iov.iov_len = sizeof(data);
1275
1276         memset(&hdr, 0, sizeof(hdr));
1277         hdr.msg_name = (void *)addr;
1278         hdr.msg_namelen = addr_len;
1279         hdr.msg_iov = &iov;
1280         hdr.msg_iovlen = 1;
1281
1282         if (set_cmsg) {
1283                 if (domain == AF_INET) {
1284                         hdr.msg_control = &control4;
1285                         hdr.msg_controllen = sizeof(control4.buf);
1286                 } else if (domain == AF_INET6) {
1287                         hdr.msg_control = &control6;
1288                         hdr.msg_controllen = sizeof(control6.buf);
1289                 }
1290                 if (init_pktinfo(domain, CMSG_FIRSTHDR(&hdr))) {
1291                         log_err("Fail to init pktinfo");
1292                         goto err;
1293                 }
1294         }
1295
1296         if (sendmsg(fd, &hdr, flags) != sizeof(data)) {
1297                 log_err("Fail to send message to server");
1298                 *syscall_err = errno;
1299                 goto err;
1300         }
1301
1302         goto out;
1303 err:
1304         close(fd);
1305         fd = -1;
1306 out:
1307         return fd;
1308 }
1309
1310 static int fastconnect_to_server(const struct sockaddr_storage *addr,
1311                                  socklen_t addr_len)
1312 {
1313         int sendmsg_err;
1314
1315         return sendmsg_to_server(SOCK_STREAM, addr, addr_len, /*set_cmsg*/0,
1316                                  MSG_FASTOPEN, &sendmsg_err);
1317 }
1318
1319 static int recvmsg_from_client(int sockfd, struct sockaddr_storage *src_addr)
1320 {
1321         struct timeval tv;
1322         struct msghdr hdr;
1323         struct iovec iov;
1324         char data[64];
1325         fd_set rfds;
1326
1327         FD_ZERO(&rfds);
1328         FD_SET(sockfd, &rfds);
1329
1330         tv.tv_sec = 2;
1331         tv.tv_usec = 0;
1332
1333         if (select(sockfd + 1, &rfds, NULL, NULL, &tv) <= 0 ||
1334             !FD_ISSET(sockfd, &rfds))
1335                 return -1;
1336
1337         memset(&iov, 0, sizeof(iov));
1338         iov.iov_base = data;
1339         iov.iov_len = sizeof(data);
1340
1341         memset(&hdr, 0, sizeof(hdr));
1342         hdr.msg_name = src_addr;
1343         hdr.msg_namelen = sizeof(struct sockaddr_storage);
1344         hdr.msg_iov = &iov;
1345         hdr.msg_iovlen = 1;
1346
1347         return recvmsg(sockfd, &hdr, 0);
1348 }
1349
1350 static int init_addrs(const struct sock_addr_test *test,
1351                       struct sockaddr_storage *requested_addr,
1352                       struct sockaddr_storage *expected_addr,
1353                       struct sockaddr_storage *expected_src_addr)
1354 {
1355         socklen_t addr_len = sizeof(struct sockaddr_storage);
1356
1357         if (mk_sockaddr(test->domain, test->expected_ip, test->expected_port,
1358                         (struct sockaddr *)expected_addr, addr_len) == -1)
1359                 goto err;
1360
1361         if (mk_sockaddr(test->domain, test->requested_ip, test->requested_port,
1362                         (struct sockaddr *)requested_addr, addr_len) == -1)
1363                 goto err;
1364
1365         if (test->expected_src_ip &&
1366             mk_sockaddr(test->domain, test->expected_src_ip, 0,
1367                         (struct sockaddr *)expected_src_addr, addr_len) == -1)
1368                 goto err;
1369
1370         return 0;
1371 err:
1372         return -1;
1373 }
1374
1375 static int run_bind_test_case(const struct sock_addr_test *test)
1376 {
1377         socklen_t addr_len = sizeof(struct sockaddr_storage);
1378         struct sockaddr_storage requested_addr;
1379         struct sockaddr_storage expected_addr;
1380         int clientfd = -1;
1381         int servfd = -1;
1382         int err = 0;
1383
1384         if (init_addrs(test, &requested_addr, &expected_addr, NULL))
1385                 goto err;
1386
1387         servfd = start_server(test->type, &requested_addr, addr_len);
1388         if (servfd == -1)
1389                 goto err;
1390
1391         if (cmp_local_addr(servfd, &expected_addr))
1392                 goto err;
1393
1394         /* Try to connect to server just in case */
1395         clientfd = connect_to_server(test->type, &expected_addr, addr_len);
1396         if (clientfd == -1)
1397                 goto err;
1398
1399         goto out;
1400 err:
1401         err = -1;
1402 out:
1403         close(clientfd);
1404         close(servfd);
1405         return err;
1406 }
1407
1408 static int run_connect_test_case(const struct sock_addr_test *test)
1409 {
1410         socklen_t addr_len = sizeof(struct sockaddr_storage);
1411         struct sockaddr_storage expected_src_addr;
1412         struct sockaddr_storage requested_addr;
1413         struct sockaddr_storage expected_addr;
1414         int clientfd = -1;
1415         int servfd = -1;
1416         int err = 0;
1417
1418         if (init_addrs(test, &requested_addr, &expected_addr,
1419                        &expected_src_addr))
1420                 goto err;
1421
1422         /* Prepare server to connect to */
1423         servfd = start_server(test->type, &expected_addr, addr_len);
1424         if (servfd == -1)
1425                 goto err;
1426
1427         clientfd = connect_to_server(test->type, &requested_addr, addr_len);
1428         if (clientfd == -1)
1429                 goto err;
1430
1431         /* Make sure src and dst addrs were overridden properly */
1432         if (cmp_peer_addr(clientfd, &expected_addr))
1433                 goto err;
1434
1435         if (cmp_local_ip(clientfd, &expected_src_addr))
1436                 goto err;
1437
1438         if (test->type == SOCK_STREAM) {
1439                 /* Test TCP Fast Open scenario */
1440                 clientfd = fastconnect_to_server(&requested_addr, addr_len);
1441                 if (clientfd == -1)
1442                         goto err;
1443
1444                 /* Make sure src and dst addrs were overridden properly */
1445                 if (cmp_peer_addr(clientfd, &expected_addr))
1446                         goto err;
1447
1448                 if (cmp_local_ip(clientfd, &expected_src_addr))
1449                         goto err;
1450         }
1451
1452         goto out;
1453 err:
1454         err = -1;
1455 out:
1456         close(clientfd);
1457         close(servfd);
1458         return err;
1459 }
1460
1461 static int run_xmsg_test_case(const struct sock_addr_test *test, int max_cmsg)
1462 {
1463         socklen_t addr_len = sizeof(struct sockaddr_storage);
1464         struct sockaddr_storage expected_addr;
1465         struct sockaddr_storage server_addr;
1466         struct sockaddr_storage sendmsg_addr;
1467         struct sockaddr_storage recvmsg_addr;
1468         int clientfd = -1;
1469         int servfd = -1;
1470         int set_cmsg;
1471         int err = 0;
1472
1473         if (test->type != SOCK_DGRAM)
1474                 goto err;
1475
1476         if (init_addrs(test, &sendmsg_addr, &server_addr, &expected_addr))
1477                 goto err;
1478
1479         /* Prepare server to sendmsg to */
1480         servfd = start_server(test->type, &server_addr, addr_len);
1481         if (servfd == -1)
1482                 goto err;
1483
1484         for (set_cmsg = 0; set_cmsg <= max_cmsg; ++set_cmsg) {
1485                 if (clientfd >= 0)
1486                         close(clientfd);
1487
1488                 clientfd = sendmsg_to_server(test->type, &sendmsg_addr,
1489                                              addr_len, set_cmsg, /*flags*/0,
1490                                              &err);
1491                 if (err)
1492                         goto out;
1493                 else if (clientfd == -1)
1494                         goto err;
1495
1496                 /* Try to receive message on server instead of using
1497                  * getpeername(2) on client socket, to check that client's
1498                  * destination address was rewritten properly, since
1499                  * getpeername(2) doesn't work with unconnected datagram
1500                  * sockets.
1501                  *
1502                  * Get source address from recvmsg(2) as well to make sure
1503                  * source was rewritten properly: getsockname(2) can't be used
1504                  * since socket is unconnected and source defined for one
1505                  * specific packet may differ from the one used by default and
1506                  * returned by getsockname(2).
1507                  */
1508                 if (recvmsg_from_client(servfd, &recvmsg_addr) == -1)
1509                         goto err;
1510
1511                 if (cmp_addr(&recvmsg_addr, &expected_addr, /*cmp_port*/0))
1512                         goto err;
1513         }
1514
1515         goto out;
1516 err:
1517         err = -1;
1518 out:
1519         close(clientfd);
1520         close(servfd);
1521         return err;
1522 }
1523
1524 static int run_test_case(int cgfd, const struct sock_addr_test *test)
1525 {
1526         int progfd = -1;
1527         int err = 0;
1528
1529         printf("Test case: %s .. ", test->descr);
1530
1531         progfd = test->loadfn(test);
1532         if (test->expected_result == LOAD_REJECT && progfd < 0)
1533                 goto out;
1534         else if (test->expected_result == LOAD_REJECT || progfd < 0)
1535                 goto err;
1536
1537         err = bpf_prog_attach(progfd, cgfd, test->attach_type,
1538                               BPF_F_ALLOW_OVERRIDE);
1539         if (test->expected_result == ATTACH_REJECT && err) {
1540                 err = 0; /* error was expected, reset it */
1541                 goto out;
1542         } else if (test->expected_result == ATTACH_REJECT || err) {
1543                 goto err;
1544         } else if (test->expected_result == ATTACH_OKAY) {
1545                 err = 0;
1546                 goto out;
1547         }
1548
1549         switch (test->attach_type) {
1550         case BPF_CGROUP_INET4_BIND:
1551         case BPF_CGROUP_INET6_BIND:
1552                 err = run_bind_test_case(test);
1553                 break;
1554         case BPF_CGROUP_INET4_CONNECT:
1555         case BPF_CGROUP_INET6_CONNECT:
1556                 err = run_connect_test_case(test);
1557                 break;
1558         case BPF_CGROUP_UDP4_SENDMSG:
1559         case BPF_CGROUP_UDP6_SENDMSG:
1560                 err = run_xmsg_test_case(test, 1);
1561                 break;
1562         case BPF_CGROUP_UDP4_RECVMSG:
1563         case BPF_CGROUP_UDP6_RECVMSG:
1564                 err = run_xmsg_test_case(test, 0);
1565                 break;
1566         default:
1567                 goto err;
1568         }
1569
1570         if (test->expected_result == SYSCALL_EPERM && err == EPERM) {
1571                 err = 0; /* error was expected, reset it */
1572                 goto out;
1573         }
1574
1575         if (test->expected_result == SYSCALL_ENOTSUPP && err == ENOTSUPP) {
1576                 err = 0; /* error was expected, reset it */
1577                 goto out;
1578         }
1579
1580         if (err || test->expected_result != SUCCESS)
1581                 goto err;
1582
1583         goto out;
1584 err:
1585         err = -1;
1586 out:
1587         /* Detaching w/o checking return code: best effort attempt. */
1588         if (progfd != -1)
1589                 bpf_prog_detach(cgfd, test->attach_type);
1590         close(progfd);
1591         printf("[%s]\n", err ? "FAIL" : "PASS");
1592         return err;
1593 }
1594
1595 static int run_tests(int cgfd)
1596 {
1597         int passes = 0;
1598         int fails = 0;
1599         int i;
1600
1601         for (i = 0; i < ARRAY_SIZE(tests); ++i) {
1602                 if (run_test_case(cgfd, &tests[i]))
1603                         ++fails;
1604                 else
1605                         ++passes;
1606         }
1607         printf("Summary: %d PASSED, %d FAILED\n", passes, fails);
1608         return fails ? -1 : 0;
1609 }
1610
1611 int main(int argc, char **argv)
1612 {
1613         int cgfd = -1;
1614         int err = 0;
1615
1616         if (argc < 2) {
1617                 fprintf(stderr,
1618                         "%s has to be run via %s.sh. Skip direct run.\n",
1619                         argv[0], argv[0]);
1620                 exit(err);
1621         }
1622
1623         if (setup_cgroup_environment())
1624                 goto err;
1625
1626         cgfd = create_and_get_cgroup(CG_PATH);
1627         if (cgfd < 0)
1628                 goto err;
1629
1630         if (join_cgroup(CG_PATH))
1631                 goto err;
1632
1633         if (run_tests(cgfd))
1634                 goto err;
1635
1636         goto out;
1637 err:
1638         err = -1;
1639 out:
1640         close(cgfd);
1641         cleanup_cgroup_environment();
1642         return err;
1643 }