tools/testing/vsock/vsock_diag_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * vsock_diag_test - vsock_diag.ko test suite
   4  *
   5  * Copyright (C) 2017 Red Hat, Inc.
   6  *
   7  * Author: Stefan Hajnoczi <[email protected]>
   8  */
   9
  10 #include <getopt.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <errno.h>
  15 #include <unistd.h>
  16 #include <sys/stat.h>
  17 #include <sys/types.h>
  18 #include <linux/list.h>
  19 #include <linux/net.h>
  20 #include <linux/netlink.h>
  21 #include <linux/sock_diag.h>
  22 #include <linux/vm_sockets_diag.h>
  23 #include <netinet/tcp.h>
  24
  25 #include "timeout.h"
  26 #include "control.h"
  27 #include "util.h"
  28
  29 /* Per-socket status */
  30 struct vsock_stat {
  31         struct list_head list;
  32         struct vsock_diag_msg msg;
  33 };
  34
  35 static const char *sock_type_str(int type)
  36 {
  37         switch (type) {
  38         case SOCK_DGRAM:
  39                 return "DGRAM";
  40         case SOCK_STREAM:
  41                 return "STREAM";
  42         case SOCK_SEQPACKET:
  43                 return "SEQPACKET";
  44         default:
  45                 return "INVALID TYPE";
  46         }
  47 }
  48
  49 static const char *sock_state_str(int state)
  50 {
  51         switch (state) {
  52         case TCP_CLOSE:
  53                 return "UNCONNECTED";
  54         case TCP_SYN_SENT:
  55                 return "CONNECTING";
  56         case TCP_ESTABLISHED:
  57                 return "CONNECTED";
  58         case TCP_CLOSING:
  59                 return "DISCONNECTING";
  60         case TCP_LISTEN:
  61                 return "LISTEN";
  62         default:
  63                 return "INVALID STATE";
  64         }
  65 }
  66
  67 static const char *sock_shutdown_str(int shutdown)
  68 {
  69         switch (shutdown) {
  70         case 1:
  71                 return "RCV_SHUTDOWN";
  72         case 2:
  73                 return "SEND_SHUTDOWN";
  74         case 3:
  75                 return "RCV_SHUTDOWN | SEND_SHUTDOWN";
  76         default:
  77                 return "0";
  78         }
  79 }
  80
  81 static void print_vsock_addr(FILE *fp, unsigned int cid, unsigned int port)
  82 {
  83         if (cid == VMADDR_CID_ANY)
  84                 fprintf(fp, "*:");
  85         else
  86                 fprintf(fp, "%u:", cid);
  87
  88         if (port == VMADDR_PORT_ANY)
  89                 fprintf(fp, "*");
  90         else
  91                 fprintf(fp, "%u", port);
  92 }
  93
  94 static void print_vsock_stat(FILE *fp, struct vsock_stat *st)
  95 {
  96         print_vsock_addr(fp, st->msg.vdiag_src_cid, st->msg.vdiag_src_port);
  97         fprintf(fp, " ");
  98         print_vsock_addr(fp, st->msg.vdiag_dst_cid, st->msg.vdiag_dst_port);
  99         fprintf(fp, " %s %s %s %u\n",
 100                 sock_type_str(st->msg.vdiag_type),
 101                 sock_state_str(st->msg.vdiag_state),
 102                 sock_shutdown_str(st->msg.vdiag_shutdown),
 103                 st->msg.vdiag_ino);
 104 }
 105
 106 static void print_vsock_stats(FILE *fp, struct list_head *head)
 107 {
 108         struct vsock_stat *st;
 109
 110         list_for_each_entry(st, head, list)
 111                 print_vsock_stat(fp, st);
 112 }
 113
 114 static struct vsock_stat *find_vsock_stat(struct list_head *head, int fd)
 115 {
 116         struct vsock_stat *st;
 117         struct stat stat;
 118
 119         if (fstat(fd, &stat) < 0) {
 120                 perror("fstat");
 121                 exit(EXIT_FAILURE);
 122         }
 123
 124         list_for_each_entry(st, head, list)
 125                 if (st->msg.vdiag_ino == stat.st_ino)
 126                         return st;
 127
 128         fprintf(stderr, "cannot find fd %d\n", fd);
 129         exit(EXIT_FAILURE);
 130 }
 131
 132 static void check_no_sockets(struct list_head *head)
 133 {
 134         if (!list_empty(head)) {
 135                 fprintf(stderr, "expected no sockets\n");
 136                 print_vsock_stats(stderr, head);
 137                 exit(1);
 138         }
 139 }
 140
 141 static void check_num_sockets(struct list_head *head, int expected)
 142 {
 143         struct list_head *node;
 144         int n = 0;
 145
 146         list_for_each(node, head)
 147                 n++;
 148
 149         if (n != expected) {
 150                 fprintf(stderr, "expected %d sockets, found %d\n",
 151                         expected, n);
 152                 print_vsock_stats(stderr, head);
 153                 exit(EXIT_FAILURE);
 154         }
 155 }
 156
 157 static void check_socket_state(struct vsock_stat *st, __u8 state)
 158 {
 159         if (st->msg.vdiag_state != state) {
 160                 fprintf(stderr, "expected socket state %#x, got %#x\n",
 161                         state, st->msg.vdiag_state);
 162                 exit(EXIT_FAILURE);
 163         }
 164 }
 165
 166 static void send_req(int fd)
 167 {
 168         struct sockaddr_nl nladdr = {
 169                 .nl_family = AF_NETLINK,
 170         };
 171         struct {
 172                 struct nlmsghdr nlh;
 173                 struct vsock_diag_req vreq;
 174         } req = {
 175                 .nlh = {
 176                         .nlmsg_len = sizeof(req),
 177                         .nlmsg_type = SOCK_DIAG_BY_FAMILY,
 178                         .nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
 179                 },
 180                 .vreq = {
 181                         .sdiag_family = AF_VSOCK,
 182                         .vdiag_states = ~(__u32)0,
 183                 },
 184         };
 185         struct iovec iov = {
 186                 .iov_base = &req,
 187                 .iov_len = sizeof(req),
 188         };
 189         struct msghdr msg = {
 190                 .msg_name = &nladdr,
 191                 .msg_namelen = sizeof(nladdr),
 192                 .msg_iov = &iov,
 193                 .msg_iovlen = 1,
 194         };
 195
 196         for (;;) {
 197                 if (sendmsg(fd, &msg, 0) < 0) {
 198                         if (errno == EINTR)
 199                                 continue;
 200
 201                         perror("sendmsg");
 202                         exit(EXIT_FAILURE);
 203                 }
 204
 205                 return;
 206         }
 207 }
 208
 209 static ssize_t recv_resp(int fd, void *buf, size_t len)
 210 {
 211         struct sockaddr_nl nladdr = {
 212                 .nl_family = AF_NETLINK,
 213         };
 214         struct iovec iov = {
 215                 .iov_base = buf,
 216                 .iov_len = len,
 217         };
 218         struct msghdr msg = {
 219                 .msg_name = &nladdr,
 220                 .msg_namelen = sizeof(nladdr),
 221                 .msg_iov = &iov,
 222                 .msg_iovlen = 1,
 223         };
 224         ssize_t ret;
 225
 226         do {
 227                 ret = recvmsg(fd, &msg, 0);
 228         } while (ret < 0 && errno == EINTR);
 229
 230         if (ret < 0) {
 231                 perror("recvmsg");
 232                 exit(EXIT_FAILURE);
 233         }
 234
 235         return ret;
 236 }
 237
 238 static void add_vsock_stat(struct list_head *sockets,
 239                            const struct vsock_diag_msg *resp)
 240 {
 241         struct vsock_stat *st;
 242
 243         st = malloc(sizeof(*st));
 244         if (!st) {
 245                 perror("malloc");
 246                 exit(EXIT_FAILURE);
 247         }
 248
 249         st->msg = *resp;
 250         list_add_tail(&st->list, sockets);
 251 }
 252
 253 /*
 254  * Read vsock stats into a list.
 255  */
 256 static void read_vsock_stat(struct list_head *sockets)
 257 {
 258         long buf[8192 / sizeof(long)];
 259         int fd;
 260
 261         fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
 262         if (fd < 0) {
 263                 perror("socket");
 264                 exit(EXIT_FAILURE);
 265         }
 266
 267         send_req(fd);
 268
 269         for (;;) {
 270                 const struct nlmsghdr *h;
 271                 ssize_t ret;
 272
 273                 ret = recv_resp(fd, buf, sizeof(buf));
 274                 if (ret == 0)
 275                         goto done;
 276                 if (ret < sizeof(*h)) {
 277                         fprintf(stderr, "short read of %zd bytes\n", ret);
 278                         exit(EXIT_FAILURE);
 279                 }
 280
 281                 h = (struct nlmsghdr *)buf;
 282
 283                 while (NLMSG_OK(h, ret)) {
 284                         if (h->nlmsg_type == NLMSG_DONE)
 285                                 goto done;
 286
 287                         if (h->nlmsg_type == NLMSG_ERROR) {
 288                                 const struct nlmsgerr *err = NLMSG_DATA(h);
 289
 290                                 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
 291                                         fprintf(stderr, "NLMSG_ERROR\n");
 292                                 else {
 293                                         errno = -err->error;
 294                                         perror("NLMSG_ERROR");
 295                                 }
 296
 297                                 exit(EXIT_FAILURE);
 298                         }
 299
 300                         if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY) {
 301                                 fprintf(stderr, "unexpected nlmsg_type %#x\n",
 302                                         h->nlmsg_type);
 303                                 exit(EXIT_FAILURE);
 304                         }
 305                         if (h->nlmsg_len <
 306                             NLMSG_LENGTH(sizeof(struct vsock_diag_msg))) {
 307                                 fprintf(stderr, "short vsock_diag_msg\n");
 308                                 exit(EXIT_FAILURE);
 309                         }
 310
 311                         add_vsock_stat(sockets, NLMSG_DATA(h));
 312
 313                         h = NLMSG_NEXT(h, ret);
 314                 }
 315         }
 316
 317 done:
 318         close(fd);
 319 }
 320
 321 static void free_sock_stat(struct list_head *sockets)
 322 {
 323         struct vsock_stat *st;
 324         struct vsock_stat *next;
 325
 326         list_for_each_entry_safe(st, next, sockets, list)
 327                 free(st);
 328 }
 329
 330 static void test_no_sockets(const struct test_opts *opts)
 331 {
 332         LIST_HEAD(sockets);
 333
 334         read_vsock_stat(&sockets);
 335
 336         check_no_sockets(&sockets);
 337 }
 338
 339 static void test_listen_socket_server(const struct test_opts *opts)
 340 {
 341         union {
 342                 struct sockaddr sa;
 343                 struct sockaddr_vm svm;
 344         } addr = {
 345                 .svm = {
 346                         .svm_family = AF_VSOCK,
 347                         .svm_port = opts->peer_port,
 348                         .svm_cid = VMADDR_CID_ANY,
 349                 },
 350         };
 351         LIST_HEAD(sockets);
 352         struct vsock_stat *st;
 353         int fd;
 354
 355         fd = socket(AF_VSOCK, SOCK_STREAM, 0);
 356
 357         if (bind(fd, &addr.sa, sizeof(addr.svm)) < 0) {
 358                 perror("bind");
 359                 exit(EXIT_FAILURE);
 360         }
 361
 362         if (listen(fd, 1) < 0) {
 363                 perror("listen");
 364                 exit(EXIT_FAILURE);
 365         }
 366
 367         read_vsock_stat(&sockets);
 368
 369         check_num_sockets(&sockets, 1);
 370         st = find_vsock_stat(&sockets, fd);
 371         check_socket_state(st, TCP_LISTEN);
 372
 373         close(fd);
 374         free_sock_stat(&sockets);
 375 }
 376
 377 static void test_connect_client(const struct test_opts *opts)
 378 {
 379         int fd;
 380         LIST_HEAD(sockets);
 381         struct vsock_stat *st;
 382
 383         fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
 384         if (fd < 0) {
 385                 perror("connect");
 386                 exit(EXIT_FAILURE);
 387         }
 388
 389         read_vsock_stat(&sockets);
 390
 391         check_num_sockets(&sockets, 1);
 392         st = find_vsock_stat(&sockets, fd);
 393         check_socket_state(st, TCP_ESTABLISHED);
 394
 395         control_expectln("DONE");
 396         control_writeln("DONE");
 397
 398         close(fd);
 399         free_sock_stat(&sockets);
 400 }
 401
 402 static void test_connect_server(const struct test_opts *opts)
 403 {
 404         struct vsock_stat *st;
 405         LIST_HEAD(sockets);
 406         int client_fd;
 407
 408         client_fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
 409         if (client_fd < 0) {
 410                 perror("accept");
 411                 exit(EXIT_FAILURE);
 412         }
 413
 414         read_vsock_stat(&sockets);
 415
 416         check_num_sockets(&sockets, 1);
 417         st = find_vsock_stat(&sockets, client_fd);
 418         check_socket_state(st, TCP_ESTABLISHED);
 419
 420         control_writeln("DONE");
 421         control_expectln("DONE");
 422
 423         close(client_fd);
 424         free_sock_stat(&sockets);
 425 }
 426
 427 static struct test_case test_cases[] = {
 428         {
 429                 .name = "No sockets",
 430                 .run_server = test_no_sockets,
 431         },
 432         {
 433                 .name = "Listen socket",
 434                 .run_server = test_listen_socket_server,
 435         },
 436         {
 437                 .name = "Connect",
 438                 .run_client = test_connect_client,
 439                 .run_server = test_connect_server,
 440         },
 441         {},
 442 };
 443
 444 static const char optstring[] = "";
 445 static const struct option longopts[] = {
 446         {
 447                 .name = "control-host",
 448                 .has_arg = required_argument,
 449                 .val = 'H',
 450         },
 451         {
 452                 .name = "control-port",
 453                 .has_arg = required_argument,
 454                 .val = 'P',
 455         },
 456         {
 457                 .name = "mode",
 458                 .has_arg = required_argument,
 459                 .val = 'm',
 460         },
 461         {
 462                 .name = "peer-cid",
 463                 .has_arg = required_argument,
 464                 .val = 'p',
 465         },
 466         {
 467                 .name = "peer-port",
 468                 .has_arg = required_argument,
 469                 .val = 'q',
 470         },
 471         {
 472                 .name = "list",
 473                 .has_arg = no_argument,
 474                 .val = 'l',
 475         },
 476         {
 477                 .name = "skip",
 478                 .has_arg = required_argument,
 479                 .val = 's',
 480         },
 481         {
 482                 .name = "help",
 483                 .has_arg = no_argument,
 484                 .val = '?',
 485         },
 486         {},
 487 };
 488
 489 static void usage(void)
 490 {
 491         fprintf(stderr, "Usage: vsock_diag_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--peer-port=<port>] [--list] [--skip=<test_id>]\n"
 492                 "\n"
 493                 "  Server: vsock_diag_test --control-port=1234 --mode=server --peer-cid=3\n"
 494                 "  Client: vsock_diag_test --control-host=192.168.0.1 --control-port=1234 --mode=client --peer-cid=2\n"
 495                 "\n"
 496                 "Run vsock_diag.ko tests.  Must be launched in both\n"
 497                 "guest and host.  One side must use --mode=client and\n"
 498                 "the other side must use --mode=server.\n"
 499                 "\n"
 500                 "A TCP control socket connection is used to coordinate tests\n"
 501                 "between the client and the server.  The server requires a\n"
 502                 "listen address and the client requires an address to\n"
 503                 "connect to.\n"
 504                 "\n"
 505                 "The CID of the other side must be given with --peer-cid=<cid>.\n"
 506                 "\n"
 507                 "Options:\n"
 508                 "  --help                 This help message\n"
 509                 "  --control-host <host>  Server IP address to connect to\n"
 510                 "  --control-port <port>  Server port to listen on/connect to\n"
 511                 "  --mode client|server   Server or client mode\n"
 512                 "  --peer-cid <cid>       CID of the other side\n"
 513                 "  --peer-port <port>     AF_VSOCK port used for the test [default: %d]\n"
 514                 "  --list                 List of tests that will be executed\n"
 515                 "  --skip <test_id>       Test ID to skip;\n"
 516                 "                         use multiple --skip options to skip more tests\n",
 517                 DEFAULT_PEER_PORT
 518                 );
 519         exit(EXIT_FAILURE);
 520 }
 521
 522 int main(int argc, char **argv)
 523 {
 524         const char *control_host = NULL;
 525         const char *control_port = NULL;
 526         struct test_opts opts = {
 527                 .mode = TEST_MODE_UNSET,
 528                 .peer_cid = VMADDR_CID_ANY,
 529                 .peer_port = DEFAULT_PEER_PORT,
 530         };
 531
 532         init_signals();
 533
 534         for (;;) {
 535                 int opt = getopt_long(argc, argv, optstring, longopts, NULL);
 536
 537                 if (opt == -1)
 538                         break;
 539
 540                 switch (opt) {
 541                 case 'H':
 542                         control_host = optarg;
 543                         break;
 544                 case 'm':
 545                         if (strcmp(optarg, "client") == 0)
 546                                 opts.mode = TEST_MODE_CLIENT;
 547                         else if (strcmp(optarg, "server") == 0)
 548                                 opts.mode = TEST_MODE_SERVER;
 549                         else {
 550                                 fprintf(stderr, "--mode must be \"client\" or \"server\"\n");
 551                                 return EXIT_FAILURE;
 552                         }
 553                         break;
 554                 case 'p':
 555                         opts.peer_cid = parse_cid(optarg);
 556                         break;
 557                 case 'q':
 558                         opts.peer_port = parse_port(optarg);
 559                         break;
 560                 case 'P':
 561                         control_port = optarg;
 562                         break;
 563                 case 'l':
 564                         list_tests(test_cases);
 565                         break;
 566                 case 's':
 567                         skip_test(test_cases, ARRAY_SIZE(test_cases) - 1,
 568                                   optarg);
 569                         break;
 570                 case '?':
 571                 default:
 572                         usage();
 573                 }
 574         }
 575
 576         if (!control_port)
 577                 usage();
 578         if (opts.mode == TEST_MODE_UNSET)
 579                 usage();
 580         if (opts.peer_cid == VMADDR_CID_ANY)
 581                 usage();
 582
 583         if (!control_host) {
 584                 if (opts.mode != TEST_MODE_SERVER)
 585                         usage();
 586                 control_host = "0.0.0.0";
 587         }
 588
 589         control_init(control_host, control_port,
 590                      opts.mode == TEST_MODE_SERVER);
 591
 592         run_tests(test_cases, &opts);
 593
 594         control_cleanup();
 595         return EXIT_SUCCESS;
 596 }