tests/test-stp.c

   1 /*
   2  * Copyright (c) 2008, 2009 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include "stp.h"
  18 #include <assert.h>
  19 #include <ctype.h>
  20 #include <errno.h>
  21 #include <inttypes.h>
  22 #include <stdarg.h>
  23 #include <stdlib.h>
  24 #include "ofpbuf.h"
  25 #include "packets.h"
  26
  27 struct bpdu {
  28     int port_no;
  29     void *data;
  30     size_t size;
  31 };
  32
  33 struct bridge {
  34     struct test_case *tc;
  35     int id;
  36     bool reached;
  37
  38     struct stp *stp;
  39
  40     struct lan *ports[STP_MAX_PORTS];
  41     int n_ports;
  42
  43 #define RXQ_SIZE 16
  44     struct bpdu rxq[RXQ_SIZE];
  45     int rxq_head, rxq_tail;
  46 };
  47
  48 struct lan_conn {
  49     struct bridge *bridge;
  50     int port_no;
  51 };
  52
  53 struct lan {
  54     struct test_case *tc;
  55     const char *name;
  56     bool reached;
  57     struct lan_conn conns[16];
  58     int n_conns;
  59 };
  60
  61 struct test_case {
  62     struct bridge *bridges[16];
  63     int n_bridges;
  64     struct lan *lans[26];
  65     int n_lans;
  66 };
  67
  68 static const char *file_name;
  69 static int line_number;
  70 static char line[128];
  71 static char *pos, *token;
  72 static int n_warnings;
  73
  74 static struct test_case *
  75 new_test_case(void)
  76 {
  77     struct test_case *tc = xmalloc(sizeof *tc);
  78     tc->n_bridges = 0;
  79     tc->n_lans = 0;
  80     return tc;
  81 }
  82
  83 static void
  84 send_bpdu(struct ofpbuf *pkt, int port_no, void *b_)
  85 {
  86     struct bridge *b = b_;
  87     struct lan *lan;
  88
  89     assert(port_no < b->n_ports);
  90     lan = b->ports[port_no];
  91     if (lan) {
  92         const void *data = pkt->l3;
  93         size_t size = (char *) ofpbuf_tail(pkt) - (char *) data;
  94         int i;
  95
  96         for (i = 0; i < lan->n_conns; i++) {
  97             struct lan_conn *conn = &lan->conns[i];
  98             if (conn->bridge != b || conn->port_no != port_no) {
  99                 struct bridge *dst = conn->bridge;
 100                 struct bpdu *bpdu = &dst->rxq[dst->rxq_head++ % RXQ_SIZE];
 101                 assert(dst->rxq_head - dst->rxq_tail <= RXQ_SIZE);
 102                 bpdu->data = xmemdup(data, size);
 103                 bpdu->size = size;
 104                 bpdu->port_no = conn->port_no;
 105             }
 106         }
 107     }
 108     ofpbuf_delete(pkt);
 109 }
 110
 111 static struct bridge *
 112 new_bridge(struct test_case *tc, int id)
 113 {
 114     struct bridge *b = xmalloc(sizeof *b);
 115     char name[16];
 116     b->tc = tc;
 117     b->id = id;
 118     snprintf(name, sizeof name, "stp%x", id);
 119     b->stp = stp_create(name, id, send_bpdu, b);
 120     assert(tc->n_bridges < ARRAY_SIZE(tc->bridges));
 121     b->n_ports = 0;
 122     b->rxq_head = b->rxq_tail = 0;
 123     tc->bridges[tc->n_bridges++] = b;
 124     return b;
 125 }
 126
 127 static struct lan *
 128 new_lan(struct test_case *tc, const char *name)
 129 {
 130     struct lan *lan = xmalloc(sizeof *lan);
 131     lan->tc = tc;
 132     lan->name = xstrdup(name);
 133     lan->n_conns = 0;
 134     assert(tc->n_lans < ARRAY_SIZE(tc->lans));
 135     tc->lans[tc->n_lans++] = lan;
 136     return lan;
 137 }
 138
 139 static void
 140 reconnect_port(struct bridge *b, int port_no, struct lan *new_lan)
 141 {
 142     struct lan *old_lan;
 143     int j;
 144
 145     assert(port_no < b->n_ports);
 146     old_lan = b->ports[port_no];
 147     if (old_lan == new_lan) {
 148         return;
 149     }
 150
 151     /* Disconnect from old_lan. */
 152     if (old_lan) {
 153         for (j = 0; j < old_lan->n_conns; j++) {
 154             struct lan_conn *c = &old_lan->conns[j];
 155             if (c->bridge == b && c->port_no == port_no) {
 156                 memmove(c, c + 1, sizeof *c * (old_lan->n_conns - j - 1));
 157                 old_lan->n_conns--;
 158                 break;
 159             }
 160         }
 161     }
 162
 163     /* Connect to new_lan. */
 164     b->ports[port_no] = new_lan;
 165     if (new_lan) {
 166         int conn_no = new_lan->n_conns++;
 167         assert(conn_no < ARRAY_SIZE(new_lan->conns));
 168         new_lan->conns[conn_no].bridge = b;
 169         new_lan->conns[conn_no].port_no = port_no;
 170     }
 171 }
 172
 173 static void
 174 new_port(struct bridge *b, struct lan *lan, int path_cost)
 175 {
 176     int port_no = b->n_ports++;
 177     struct stp_port *p = stp_get_port(b->stp, port_no);
 178     assert(port_no < ARRAY_SIZE(b->ports));
 179     b->ports[port_no] = NULL;
 180     stp_port_set_path_cost(p, path_cost);
 181     stp_port_enable(p);
 182     reconnect_port(b, port_no, lan);
 183 }
 184
 185 static void
 186 dump(struct test_case *tc)
 187 {
 188     int i;
 189
 190     for (i = 0; i < tc->n_bridges; i++) {
 191         struct bridge *b = tc->bridges[i];
 192         struct stp *stp = b->stp;
 193         int j;
 194
 195         printf("%s:", stp_get_name(stp));
 196         if (stp_is_root_bridge(stp)) {
 197             printf(" root");
 198         }
 199         printf("\n");
 200         for (j = 0; j < b->n_ports; j++) {
 201             struct stp_port *p = stp_get_port(stp, j);
 202             enum stp_state state = stp_port_get_state(p);
 203
 204             printf("\tport %d", j);
 205             if (b->ports[j]) {
 206                 printf(" (lan %s)", b->ports[j]->name);
 207             } else {
 208                 printf(" (disconnected)");
 209             }
 210             printf(": %s", stp_state_name(state));
 211             if (p == stp_get_root_port(stp)) {
 212                 printf(" (root port, root_path_cost=%u)", stp_get_root_path_cost(stp));
 213             }
 214             printf("\n");
 215         }
 216     }
 217 }
 218
 219 static void dump_lan_tree(struct test_case *, struct lan *, int level);
 220
 221 static void
 222 dump_bridge_tree(struct test_case *tc, struct bridge *b, int level)
 223 {
 224     int i;
 225
 226     if (b->reached) {
 227         return;
 228     }
 229     b->reached = true;
 230     for (i = 0; i < level; i++) {
 231         printf("\t");
 232     }
 233     printf("%s\n", stp_get_name(b->stp));
 234     for (i = 0; i < b->n_ports; i++) {
 235         struct lan *lan = b->ports[i];
 236         struct stp_port *p = stp_get_port(b->stp, i);
 237         if (stp_port_get_state(p) == STP_FORWARDING && lan) {
 238             dump_lan_tree(tc, lan, level + 1);
 239         }
 240     }
 241 }
 242
 243 static void
 244 dump_lan_tree(struct test_case *tc, struct lan *lan, int level)
 245 {
 246     int i;
 247
 248     if (lan->reached) {
 249         return;
 250     }
 251     lan->reached = true;
 252     for (i = 0; i < level; i++) {
 253         printf("\t");
 254     }
 255     printf("%s\n", lan->name);
 256     for (i = 0; i < lan->n_conns; i++) {
 257         struct bridge *b = lan->conns[i].bridge;
 258         dump_bridge_tree(tc, b, level + 1);
 259     }
 260 }
 261
 262 static void
 263 tree(struct test_case *tc)
 264 {
 265     int i;
 266
 267     for (i = 0; i < tc->n_bridges; i++) {
 268         struct bridge *b = tc->bridges[i];
 269         b->reached = false;
 270     }
 271     for (i = 0; i < tc->n_lans; i++) {
 272         struct lan *lan = tc->lans[i];
 273         lan->reached = false;
 274     }
 275     for (i = 0; i < tc->n_bridges; i++) {
 276         struct bridge *b = tc->bridges[i];
 277         struct stp *stp = b->stp;
 278         if (stp_is_root_bridge(stp)) {
 279             dump_bridge_tree(tc, b, 0);
 280         }
 281     }
 282 }
 283
 284 static void
 285 simulate(struct test_case *tc, int granularity)
 286 {
 287     int time;
 288
 289     for (time = 0; time < 1000 * 180; time += granularity) {
 290         int round_trips;
 291         int i;
 292
 293         for (i = 0; i < tc->n_bridges; i++) {
 294             stp_tick(tc->bridges[i]->stp, granularity);
 295         }
 296         for (round_trips = 0; round_trips < granularity; round_trips++) {
 297             bool any = false;
 298             for (i = 0; i < tc->n_bridges; i++) {
 299                 struct bridge *b = tc->bridges[i];
 300                 for (; b->rxq_tail != b->rxq_head; b->rxq_tail++) {
 301                     struct bpdu *bpdu = &b->rxq[b->rxq_tail % RXQ_SIZE];
 302                     stp_received_bpdu(stp_get_port(b->stp, bpdu->port_no),
 303                                       bpdu->data, bpdu->size);
 304                     any = true;
 305                 }
 306             }
 307             if (!any) {
 308                 break;
 309             }
 310         }
 311     }
 312 }
 313
 314 static void
 315 err(const char *message, ...)
 316     PRINTF_FORMAT(1, 2)
 317     NO_RETURN;
 318
 319 static void
 320 err(const char *message, ...)
 321 {
 322     va_list args;
 323
 324     fprintf(stderr, "%s:%d:%td: ", file_name, line_number, pos - line);
 325     va_start(args, message);
 326     vfprintf(stderr, message, args);
 327     va_end(args);
 328     putc('\n', stderr);
 329
 330     exit(EXIT_FAILURE);
 331 }
 332
 333 static void
 334 warn(const char *message, ...)
 335     PRINTF_FORMAT(1, 2);
 336
 337 static void
 338 warn(const char *message, ...)
 339 {
 340     va_list args;
 341
 342     fprintf(stderr, "%s:%d: ", file_name, line_number);
 343     va_start(args, message);
 344     vfprintf(stderr, message, args);
 345     va_end(args);
 346     putc('\n', stderr);
 347
 348     n_warnings++;
 349 }
 350
 351 static bool
 352 get_token(void)
 353 {
 354     char *start;
 355
 356     while (isspace((unsigned char) *pos)) {
 357         pos++;
 358     }
 359     if (*pos == '\0') {
 360         token = NULL;
 361         return false;
 362     }
 363
 364     start = pos;
 365     if (isalpha((unsigned char) *pos)) {
 366         while (isalpha((unsigned char) *++pos)) {
 367             continue;
 368         }
 369     } else if (isdigit((unsigned char) *pos)) {
 370         if (*pos == '0' && (pos[1] == 'x' || pos[1] == 'X')) {
 371             pos += 2;
 372             while (isxdigit((unsigned char) *pos)) {
 373                 pos++;
 374             }
 375         } else {
 376             while (isdigit((unsigned char) *++pos)) {
 377                 continue;
 378             }
 379         }
 380     } else {
 381         pos++;
 382     }
 383
 384     free(token);
 385     token = xmemdup0(start, pos - start);
 386     return true;
 387 }
 388
 389 static bool
 390 get_int(int *intp)
 391 {
 392     char *save_pos = pos;
 393     if (token && isdigit((unsigned char) *token)) {
 394         *intp = strtol(token, NULL, 0);
 395         get_token();
 396         return true;
 397     } else {
 398         pos = save_pos;
 399         return false;
 400     }
 401 }
 402
 403 static bool
 404 match(const char *want)
 405 {
 406     if (token && !strcmp(want, token)) {
 407         get_token();
 408         return true;
 409     } else {
 410         return false;
 411     }
 412 }
 413
 414 static int
 415 must_get_int(void)
 416 {
 417     int x;
 418     if (!get_int(&x)) {
 419         err("expected integer");
 420     }
 421     return x;
 422 }
 423
 424 static void
 425 must_match(const char *want)
 426 {
 427     if (!match(want)) {
 428         err("expected \"%s\"", want);
 429     }
 430 }
 431
 432 int
 433 main(int argc, char *argv[])
 434 {
 435     struct test_case *tc;
 436     FILE *input_file;
 437     int i;
 438
 439     if (argc != 2) {
 440         ovs_fatal(0, "usage: test-stp INPUT.STP\n");
 441     }
 442     file_name = argv[1];
 443
 444     input_file = fopen(file_name, "r");
 445     if (!input_file) {
 446         ovs_fatal(errno, "error opening \"%s\"", file_name);
 447     }
 448
 449     tc = new_test_case();
 450     for (i = 0; i < 26; i++) {
 451         char name[2];
 452         name[0] = 'a' + i;
 453         name[1] = '\0';
 454         new_lan(tc, name);
 455     }
 456
 457     for (line_number = 1; fgets(line, sizeof line, input_file);
 458          line_number++)
 459     {
 460         char *newline, *hash;
 461
 462         newline = strchr(line, '\n');
 463         if (newline) {
 464             *newline = '\0';
 465         }
 466         hash = strchr(line, '#');
 467         if (hash) {
 468             *hash = '\0';
 469         }
 470
 471         pos = line;
 472         if (!get_token()) {
 473             continue;
 474         }
 475         if (match("bridge")) {
 476             struct bridge *bridge;
 477             int bridge_no, port_no;
 478
 479             bridge_no = must_get_int();
 480             if (bridge_no < tc->n_bridges) {
 481                 bridge = tc->bridges[bridge_no];
 482             } else if (bridge_no == tc->n_bridges) {
 483                 bridge = new_bridge(tc, must_get_int());
 484             } else {
 485                 err("bridges must be numbered consecutively from 0");
 486             }
 487             if (match("^")) {
 488                 stp_set_bridge_priority(bridge->stp, must_get_int());
 489             }
 490
 491             if (match("=")) {
 492                 for (port_no = 0; port_no < STP_MAX_PORTS; port_no++) {
 493                     struct stp_port *p = stp_get_port(bridge->stp, port_no);
 494                     if (!token || match("X")) {
 495                         stp_port_disable(p);
 496                     } else if (match("_")) {
 497                         /* Nothing to do. */
 498                     } else {
 499                         struct lan *lan;
 500                         int path_cost;
 501
 502                         if (!strcmp(token, "0")) {
 503                             lan = NULL;
 504                         } else if (strlen(token) == 1
 505                                 && islower((unsigned char)*token)) {
 506                             lan = tc->lans[*token - 'a'];
 507                         } else {
 508                             err("%s is not a valid LAN name "
 509                                 "(0 or a lowercase letter)", token);
 510                         }
 511                         get_token();
 512
 513                         path_cost = match(":") ? must_get_int() : 10;
 514                         if (port_no < bridge->n_ports) {
 515                             stp_port_set_path_cost(p, path_cost);
 516                             stp_port_enable(p);
 517                             reconnect_port(bridge, port_no, lan);
 518                         } else if (port_no == bridge->n_ports) {
 519                             new_port(bridge, lan, path_cost);
 520                         } else {
 521                             err("ports must be numbered consecutively");
 522                         }
 523                         if (match("^")) {
 524                             stp_port_set_priority(p, must_get_int());
 525                         }
 526                     }
 527                 }
 528             }
 529         } else if (match("run")) {
 530             simulate(tc, must_get_int());
 531         } else if (match("dump")) {
 532             dump(tc);
 533         } else if (match("tree")) {
 534             tree(tc);
 535         } else if (match("check")) {
 536             struct bridge *b;
 537             struct stp *stp;
 538             int bridge_no, port_no;
 539
 540             bridge_no = must_get_int();
 541             if (bridge_no >= tc->n_bridges) {
 542                 err("no bridge numbered %d", bridge_no);
 543             }
 544             b = tc->bridges[bridge_no];
 545             stp = b->stp;
 546
 547             must_match("=");
 548
 549             if (match("rootid")) {
 550                 uint64_t rootid;
 551                 must_match(":");
 552                 rootid = must_get_int();
 553                 if (match("^")) {
 554                     rootid |= (uint64_t) must_get_int() << 48;
 555                 } else {
 556                     rootid |= UINT64_C(0x8000) << 48;
 557                 }
 558                 if (stp_get_designated_root(stp) != rootid) {
 559                     warn("%s: root %"PRIx64", not %"PRIx64,
 560                          stp_get_name(stp), stp_get_designated_root(stp),
 561                          rootid);
 562                 }
 563             }
 564
 565             if (match("root")) {
 566                 if (stp_get_root_path_cost(stp)) {
 567                     warn("%s: root path cost of root is %u but should be 0",
 568                          stp_get_name(stp), stp_get_root_path_cost(stp));
 569                 }
 570                 if (!stp_is_root_bridge(stp)) {
 571                     warn("%s: root is %"PRIx64", not %"PRIx64,
 572                          stp_get_name(stp),
 573                          stp_get_designated_root(stp), stp_get_bridge_id(stp));
 574                 }
 575                 for (port_no = 0; port_no < b->n_ports; port_no++) {
 576                     struct stp_port *p = stp_get_port(stp, port_no);
 577                     enum stp_state state = stp_port_get_state(p);
 578                     if (!(state & (STP_DISABLED | STP_FORWARDING))) {
 579                         warn("%s: root port %d in state %s",
 580                              stp_get_name(b->stp), port_no,
 581                              stp_state_name(state));
 582                     }
 583                 }
 584             } else {
 585                 for (port_no = 0; port_no < STP_MAX_PORTS; port_no++) {
 586                     struct stp_port *p = stp_get_port(stp, port_no);
 587                     enum stp_state state;
 588                     if (token == NULL || match("D")) {
 589                         state = STP_DISABLED;
 590                     } else if (match("B")) {
 591                         state = STP_BLOCKING;
 592                     } else if (match("Li")) {
 593                         state = STP_LISTENING;
 594                     } else if (match("Le")) {
 595                         state = STP_LEARNING;
 596                     } else if (match("F")) {
 597                         state = STP_FORWARDING;
 598                     } else if (match("_")) {
 599                         continue;
 600                     } else {
 601                         err("unknown port state %s", token);
 602                     }
 603                     if (stp_port_get_state(p) != state) {
 604                         warn("%s port %d: state is %s but should be %s",
 605                              stp_get_name(stp), port_no,
 606                              stp_state_name(stp_port_get_state(p)),
 607                              stp_state_name(state));
 608                     }
 609                     if (state == STP_FORWARDING) {
 610                         struct stp_port *root_port = stp_get_root_port(stp);
 611                         if (match(":")) {
 612                             int root_path_cost = must_get_int();
 613                             if (p != root_port) {
 614                                 warn("%s: port %d is not the root port",
 615                                      stp_get_name(stp), port_no);
 616                                 if (!root_port) {
 617                                     warn("%s: (there is no root port)",
 618                                          stp_get_name(stp));
 619                                 } else {
 620                                     warn("%s: (port %d is the root port)",
 621                                          stp_get_name(stp),
 622                                          stp_port_no(root_port));
 623                                 }
 624                             } else if (root_path_cost
 625                                        != stp_get_root_path_cost(stp)) {
 626                                 warn("%s: root path cost is %u, should be %d",
 627                                      stp_get_name(stp),
 628                                      stp_get_root_path_cost(stp),
 629                                      root_path_cost);
 630                             }
 631                         } else if (p == root_port) {
 632                             warn("%s: port %d is the root port but "
 633                                  "not expected to be",
 634                                  stp_get_name(stp), port_no);
 635                         }
 636                     }
 637                 }
 638             }
 639             if (n_warnings) {
 640                 exit(EXIT_FAILURE);
 641             }
 642         }
 643         if (get_token()) {
 644             err("trailing garbage on line");
 645         }
 646     }
 647
 648     return 0;
 649 }