net/tipc/name_table.c

   1 /*
   2  * net/tipc/name_table.c: TIPC name table code
   3  *
   4  * Copyright (c) 2000-2006, Ericsson AB
   5  * Copyright (c) 2004-2005, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "core.h"
  38 #include "config.h"
  39 #include "dbg.h"
  40 #include "name_table.h"
  41 #include "name_distr.h"
  42 #include "addr.h"
  43 #include "node_subscr.h"
  44 #include "subscr.h"
  45 #include "port.h"
  46 #include "cluster.h"
  47 #include "bcast.h"
  48
  49 static int tipc_nametbl_size = 1024;            /* must be a power of 2 */
  50
  51 /**
  52  * struct sub_seq - container for all published instances of a name sequence
  53  * @lower: name sequence lower bound
  54  * @upper: name sequence upper bound
  55  * @node_list: circular list of matching publications with >= node scope
  56  * @cluster_list: circular list of matching publications with >= cluster scope
  57  * @zone_list: circular list of matching publications with >= zone scope
  58  */
  59
  60 struct sub_seq {
  61         u32 lower;
  62         u32 upper;
  63         struct publication *node_list;
  64         struct publication *cluster_list;
  65         struct publication *zone_list;
  66 };
  67
  68 /**
  69  * struct name_seq - container for all published instances of a name type
  70  * @type: 32 bit 'type' value for name sequence
  71  * @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
  72  *        sub-sequences are sorted in ascending order
  73  * @alloc: number of sub-sequences currently in array
  74  * @first_free: array index of first unused sub-sequence entry
  75  * @ns_list: links to adjacent name sequences in hash chain
  76  * @subscriptions: list of subscriptions for this 'type'
  77  * @lock: spinlock controlling access to name sequence structure
  78  */
  79
  80 struct name_seq {
  81         u32 type;
  82         struct sub_seq *sseqs;
  83         u32 alloc;
  84         u32 first_free;
  85         struct hlist_node ns_list;
  86         struct list_head subscriptions;
  87         spinlock_t lock;
  88 };
  89
  90 /**
  91  * struct name_table - table containing all existing port name publications
  92  * @types: pointer to fixed-sized array of name sequence lists,
  93  *         accessed via hashing on 'type'; name sequence lists are *not* sorted
  94  * @local_publ_count: number of publications issued by this node
  95  */
  96
  97 struct name_table {
  98         struct hlist_head *types;
  99         u32 local_publ_count;
 100 };
 101
 102 static struct name_table table = { NULL } ;
 103 static atomic_t rsv_publ_ok = ATOMIC_INIT(0);
 104 DEFINE_RWLOCK(tipc_nametbl_lock);
 105
 106
 107 static int hash(int x)
 108 {
 109         return(x & (tipc_nametbl_size - 1));
 110 }
 111
 112 /**
 113  * publ_create - create a publication structure
 114  */
 115
 116 static struct publication *publ_create(u32 type, u32 lower, u32 upper,
 117                                        u32 scope, u32 node, u32 port_ref,
 118                                        u32 key)
 119 {
 120         struct publication *publ = kzalloc(sizeof(*publ), GFP_ATOMIC);
 121         if (publ == NULL) {
 122                 warn("Publication creation failure, no memory\n");
 123                 return NULL;
 124         }
 125
 126         publ->type = type;
 127         publ->lower = lower;
 128         publ->upper = upper;
 129         publ->scope = scope;
 130         publ->node = node;
 131         publ->ref = port_ref;
 132         publ->key = key;
 133         INIT_LIST_HEAD(&publ->local_list);
 134         INIT_LIST_HEAD(&publ->pport_list);
 135         INIT_LIST_HEAD(&publ->subscr.nodesub_list);
 136         return publ;
 137 }
 138
 139 /**
 140  * tipc_subseq_alloc - allocate a specified number of sub-sequence structures
 141  */
 142
 143 static struct sub_seq *tipc_subseq_alloc(u32 cnt)
 144 {
 145         struct sub_seq *sseq = kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
 146         return sseq;
 147 }
 148
 149 /**
 150  * tipc_nameseq_create - create a name sequence structure for the specified 'type'
 151  *
 152  * Allocates a single sub-sequence structure and sets it to all 0's.
 153  */
 154
 155 static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
 156 {
 157         struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
 158         struct sub_seq *sseq = tipc_subseq_alloc(1);
 159
 160         if (!nseq || !sseq) {
 161                 warn("Name sequence creation failed, no memory\n");
 162                 kfree(nseq);
 163                 kfree(sseq);
 164                 return NULL;
 165         }
 166
 167         spin_lock_init(&nseq->lock);
 168         nseq->type = type;
 169         nseq->sseqs = sseq;
 170         dbg("tipc_nameseq_create(): nseq = %p, type %u, ssseqs %p, ff: %u\n",
 171             nseq, type, nseq->sseqs, nseq->first_free);
 172         nseq->alloc = 1;
 173         INIT_HLIST_NODE(&nseq->ns_list);
 174         INIT_LIST_HEAD(&nseq->subscriptions);
 175         hlist_add_head(&nseq->ns_list, seq_head);
 176         return nseq;
 177 }
 178
 179 /**
 180  * nameseq_find_subseq - find sub-sequence (if any) matching a name instance
 181  *
 182  * Very time-critical, so binary searches through sub-sequence array.
 183  */
 184
 185 static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
 186                                            u32 instance)
 187 {
 188         struct sub_seq *sseqs = nseq->sseqs;
 189         int low = 0;
 190         int high = nseq->first_free - 1;
 191         int mid;
 192
 193         while (low <= high) {
 194                 mid = (low + high) / 2;
 195                 if (instance < sseqs[mid].lower)
 196                         high = mid - 1;
 197                 else if (instance > sseqs[mid].upper)
 198                         low = mid + 1;
 199                 else
 200                         return &sseqs[mid];
 201         }
 202         return NULL;
 203 }
 204
 205 /**
 206  * nameseq_locate_subseq - determine position of name instance in sub-sequence
 207  *
 208  * Returns index in sub-sequence array of the entry that contains the specified
 209  * instance value; if no entry contains that value, returns the position
 210  * where a new entry for it would be inserted in the array.
 211  *
 212  * Note: Similar to binary search code for locating a sub-sequence.
 213  */
 214
 215 static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
 216 {
 217         struct sub_seq *sseqs = nseq->sseqs;
 218         int low = 0;
 219         int high = nseq->first_free - 1;
 220         int mid;
 221
 222         while (low <= high) {
 223                 mid = (low + high) / 2;
 224                 if (instance < sseqs[mid].lower)
 225                         high = mid - 1;
 226                 else if (instance > sseqs[mid].upper)
 227                         low = mid + 1;
 228                 else
 229                         return mid;
 230         }
 231         return low;
 232 }
 233
 234 /**
 235  * tipc_nameseq_insert_publ -
 236  */
 237
 238 static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 239                                                     u32 type, u32 lower, u32 upper,
 240                                                     u32 scope, u32 node, u32 port, u32 key)
 241 {
 242         struct subscription *s;
 243         struct subscription *st;
 244         struct publication *publ;
 245         struct sub_seq *sseq;
 246         int created_subseq = 0;
 247
 248         sseq = nameseq_find_subseq(nseq, lower);
 249         dbg("nameseq_ins: for seq %p, {%u,%u}, found sseq %p\n",
 250             nseq, type, lower, sseq);
 251         if (sseq) {
 252
 253                 /* Lower end overlaps existing entry => need an exact match */
 254
 255                 if ((sseq->lower != lower) || (sseq->upper != upper)) {
 256                         warn("Cannot publish {%u,%u,%u}, overlap error\n",
 257                              type, lower, upper);
 258                         return NULL;
 259                 }
 260         } else {
 261                 u32 inspos;
 262                 struct sub_seq *freesseq;
 263
 264                 /* Find where lower end should be inserted */
 265
 266                 inspos = nameseq_locate_subseq(nseq, lower);
 267
 268                 /* Fail if upper end overlaps into an existing entry */
 269
 270                 if ((inspos < nseq->first_free) &&
 271                     (upper >= nseq->sseqs[inspos].lower)) {
 272                         warn("Cannot publish {%u,%u,%u}, overlap error\n",
 273                              type, lower, upper);
 274                         return NULL;
 275                 }
 276
 277                 /* Ensure there is space for new sub-sequence */
 278
 279                 if (nseq->first_free == nseq->alloc) {
 280                         struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
 281
 282                         if (!sseqs) {
 283                                 warn("Cannot publish {%u,%u,%u}, no memory\n",
 284                                      type, lower, upper);
 285                                 return NULL;
 286                         }
 287                         dbg("Allocated %u more sseqs\n", nseq->alloc);
 288                         memcpy(sseqs, nseq->sseqs,
 289                                nseq->alloc * sizeof(struct sub_seq));
 290                         kfree(nseq->sseqs);
 291                         nseq->sseqs = sseqs;
 292                         nseq->alloc *= 2;
 293                 }
 294                 dbg("Have %u sseqs for type %u\n", nseq->alloc, type);
 295
 296                 /* Insert new sub-sequence */
 297
 298                 dbg("ins in pos %u, ff = %u\n", inspos, nseq->first_free);
 299                 sseq = &nseq->sseqs[inspos];
 300                 freesseq = &nseq->sseqs[nseq->first_free];
 301                 memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof (*sseq));
 302                 memset(sseq, 0, sizeof (*sseq));
 303                 nseq->first_free++;
 304                 sseq->lower = lower;
 305                 sseq->upper = upper;
 306                 created_subseq = 1;
 307         }
 308         dbg("inserting {%u,%u,%u} from <0x%x:%u> into sseq %p(%u,%u) of seq %p\n",
 309             type, lower, upper, node, port, sseq,
 310             sseq->lower, sseq->upper, nseq);
 311
 312         /* Insert a publication: */
 313
 314         publ = publ_create(type, lower, upper, scope, node, port, key);
 315         if (!publ)
 316                 return NULL;
 317         dbg("inserting publ %p, node=0x%x publ->node=0x%x, subscr->node=%p\n",
 318             publ, node, publ->node, publ->subscr.node);
 319
 320         if (!sseq->zone_list)
 321                 sseq->zone_list = publ->zone_list_next = publ;
 322         else {
 323                 publ->zone_list_next = sseq->zone_list->zone_list_next;
 324                 sseq->zone_list->zone_list_next = publ;
 325         }
 326
 327         if (in_own_cluster(node)) {
 328                 if (!sseq->cluster_list)
 329                         sseq->cluster_list = publ->cluster_list_next = publ;
 330                 else {
 331                         publ->cluster_list_next =
 332                         sseq->cluster_list->cluster_list_next;
 333                         sseq->cluster_list->cluster_list_next = publ;
 334                 }
 335         }
 336
 337         if (node == tipc_own_addr) {
 338                 if (!sseq->node_list)
 339                         sseq->node_list = publ->node_list_next = publ;
 340                 else {
 341                         publ->node_list_next = sseq->node_list->node_list_next;
 342                         sseq->node_list->node_list_next = publ;
 343                 }
 344         }
 345
 346         /*
 347          * Any subscriptions waiting for notification?
 348          */
 349         list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
 350                 dbg("calling report_overlap()\n");
 351                 tipc_subscr_report_overlap(s,
 352                                            publ->lower,
 353                                            publ->upper,
 354                                            TIPC_PUBLISHED,
 355                                            publ->ref,
 356                                            publ->node,
 357                                            created_subseq);
 358         }
 359         return publ;
 360 }
 361
 362 /**
 363  * tipc_nameseq_remove_publ -
 364  *
 365  * NOTE: There may be cases where TIPC is asked to remove a publication
 366  * that is not in the name table.  For example, if another node issues a
 367  * publication for a name sequence that overlaps an existing name sequence
 368  * the publication will not be recorded, which means the publication won't
 369  * be found when the name sequence is later withdrawn by that node.
 370  * A failed withdraw request simply returns a failure indication and lets the
 371  * caller issue any error or warning messages associated with such a problem.
 372  */
 373
 374 static struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 inst,
 375                                                     u32 node, u32 ref, u32 key)
 376 {
 377         struct publication *publ;
 378         struct publication *curr;
 379         struct publication *prev;
 380         struct sub_seq *sseq = nameseq_find_subseq(nseq, inst);
 381         struct sub_seq *free;
 382         struct subscription *s, *st;
 383         int removed_subseq = 0;
 384
 385         if (!sseq)
 386                 return NULL;
 387
 388         dbg("tipc_nameseq_remove_publ: seq: %p, sseq %p, {%u,%u}, key %u\n",
 389             nseq, sseq, nseq->type, inst, key);
 390
 391         /* Remove publication from zone scope list */
 392
 393         prev = sseq->zone_list;
 394         publ = sseq->zone_list->zone_list_next;
 395         while ((publ->key != key) || (publ->ref != ref) ||
 396                (publ->node && (publ->node != node))) {
 397                 prev = publ;
 398                 publ = publ->zone_list_next;
 399                 if (prev == sseq->zone_list) {
 400
 401                         /* Prevent endless loop if publication not found */
 402
 403                         return NULL;
 404                 }
 405         }
 406         if (publ != sseq->zone_list)
 407                 prev->zone_list_next = publ->zone_list_next;
 408         else if (publ->zone_list_next != publ) {
 409                 prev->zone_list_next = publ->zone_list_next;
 410                 sseq->zone_list = publ->zone_list_next;
 411         } else {
 412                 sseq->zone_list = NULL;
 413         }
 414
 415         /* Remove publication from cluster scope list, if present */
 416
 417         if (in_own_cluster(node)) {
 418                 prev = sseq->cluster_list;
 419                 curr = sseq->cluster_list->cluster_list_next;
 420                 while (curr != publ) {
 421                         prev = curr;
 422                         curr = curr->cluster_list_next;
 423                         if (prev == sseq->cluster_list) {
 424
 425                                 /* Prevent endless loop for malformed list */
 426
 427                                 err("Unable to de-list cluster publication\n"
 428                                     "{%u%u}, node=0x%x, ref=%u, key=%u)\n",
 429                                     publ->type, publ->lower, publ->node,
 430                                     publ->ref, publ->key);
 431                                 goto end_cluster;
 432                         }
 433                 }
 434                 if (publ != sseq->cluster_list)
 435                         prev->cluster_list_next = publ->cluster_list_next;
 436                 else if (publ->cluster_list_next != publ) {
 437                         prev->cluster_list_next = publ->cluster_list_next;
 438                         sseq->cluster_list = publ->cluster_list_next;
 439                 } else {
 440                         sseq->cluster_list = NULL;
 441                 }
 442         }
 443 end_cluster:
 444
 445         /* Remove publication from node scope list, if present */
 446
 447         if (node == tipc_own_addr) {
 448                 prev = sseq->node_list;
 449                 curr = sseq->node_list->node_list_next;
 450                 while (curr != publ) {
 451                         prev = curr;
 452                         curr = curr->node_list_next;
 453                         if (prev == sseq->node_list) {
 454
 455                                 /* Prevent endless loop for malformed list */
 456
 457                                 err("Unable to de-list node publication\n"
 458                                     "{%u%u}, node=0x%x, ref=%u, key=%u)\n",
 459                                     publ->type, publ->lower, publ->node,
 460                                     publ->ref, publ->key);
 461                                 goto end_node;
 462                         }
 463                 }
 464                 if (publ != sseq->node_list)
 465                         prev->node_list_next = publ->node_list_next;
 466                 else if (publ->node_list_next != publ) {
 467                         prev->node_list_next = publ->node_list_next;
 468                         sseq->node_list = publ->node_list_next;
 469                 } else {
 470                         sseq->node_list = NULL;
 471                 }
 472         }
 473 end_node:
 474
 475         /* Contract subseq list if no more publications for that subseq */
 476
 477         if (!sseq->zone_list) {
 478                 free = &nseq->sseqs[nseq->first_free--];
 479                 memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof (*sseq));
 480                 removed_subseq = 1;
 481         }
 482
 483         /* Notify any waiting subscriptions */
 484
 485         list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
 486                 tipc_subscr_report_overlap(s,
 487                                            publ->lower,
 488                                            publ->upper,
 489                                            TIPC_WITHDRAWN,
 490                                            publ->ref,
 491                                            publ->node,
 492                                            removed_subseq);
 493         }
 494
 495         return publ;
 496 }
 497
 498 /**
 499  * tipc_nameseq_subscribe: attach a subscription, and issue
 500  * the prescribed number of events if there is any sub-
 501  * sequence overlapping with the requested sequence
 502  */
 503
 504 static void tipc_nameseq_subscribe(struct name_seq *nseq, struct subscription *s)
 505 {
 506         struct sub_seq *sseq = nseq->sseqs;
 507
 508         list_add(&s->nameseq_list, &nseq->subscriptions);
 509
 510         if (!sseq)
 511                 return;
 512
 513         while (sseq != &nseq->sseqs[nseq->first_free]) {
 514                 struct publication *zl = sseq->zone_list;
 515                 if (zl && tipc_subscr_overlap(s,sseq->lower,sseq->upper)) {
 516                         struct publication *crs = zl;
 517                         int must_report = 1;
 518
 519                         do {
 520                                 tipc_subscr_report_overlap(s,
 521                                                            sseq->lower,
 522                                                            sseq->upper,
 523                                                            TIPC_PUBLISHED,
 524                                                            crs->ref,
 525                                                            crs->node,
 526                                                            must_report);
 527                                 must_report = 0;
 528                                 crs = crs->zone_list_next;
 529                         } while (crs != zl);
 530                 }
 531                 sseq++;
 532         }
 533 }
 534
 535 static struct name_seq *nametbl_find_seq(u32 type)
 536 {
 537         struct hlist_head *seq_head;
 538         struct hlist_node *seq_node;
 539         struct name_seq *ns;
 540
 541         dbg("find_seq %u,(%u,0x%x) table = %p, hash[type] = %u\n",
 542             type, ntohl(type), type, table.types, hash(type));
 543
 544         seq_head = &table.types[hash(type)];
 545         hlist_for_each_entry(ns, seq_node, seq_head, ns_list) {
 546                 if (ns->type == type) {
 547                         dbg("found %p\n", ns);
 548                         return ns;
 549                 }
 550         }
 551
 552         return NULL;
 553 };
 554
 555 struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
 556                                              u32 scope, u32 node, u32 port, u32 key)
 557 {
 558         struct name_seq *seq = nametbl_find_seq(type);
 559
 560         dbg("tipc_nametbl_insert_publ: {%u,%u,%u} found %p\n", type, lower, upper, seq);
 561         if (lower > upper) {
 562                 warn("Failed to publish illegal {%u,%u,%u}\n",
 563                      type, lower, upper);
 564                 return NULL;
 565         }
 566
 567         dbg("Publishing {%u,%u,%u} from 0x%x\n", type, lower, upper, node);
 568         if (!seq) {
 569                 seq = tipc_nameseq_create(type, &table.types[hash(type)]);
 570                 dbg("tipc_nametbl_insert_publ: created %p\n", seq);
 571         }
 572         if (!seq)
 573                 return NULL;
 574
 575         return tipc_nameseq_insert_publ(seq, type, lower, upper,
 576                                         scope, node, port, key);
 577 }
 578
 579 struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
 580                                              u32 node, u32 ref, u32 key)
 581 {
 582         struct publication *publ;
 583         struct name_seq *seq = nametbl_find_seq(type);
 584
 585         if (!seq)
 586                 return NULL;
 587
 588         dbg("Withdrawing {%u,%u} from 0x%x\n", type, lower, node);
 589         publ = tipc_nameseq_remove_publ(seq, lower, node, ref, key);
 590
 591         if (!seq->first_free && list_empty(&seq->subscriptions)) {
 592                 hlist_del_init(&seq->ns_list);
 593                 kfree(seq->sseqs);
 594                 kfree(seq);
 595         }
 596         return publ;
 597 }
 598
 599 /*
 600  * tipc_nametbl_translate(): Translate tipc_name -> tipc_portid.
 601  *                      Very time-critical.
 602  *
 603  * Note: on entry 'destnode' is the search domain used during translation;
 604  *       on exit it passes back the node address of the matching port (if any)
 605  */
 606
 607 u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
 608 {
 609         struct sub_seq *sseq;
 610         struct publication *publ = NULL;
 611         struct name_seq *seq;
 612         u32 ref;
 613
 614         if (!in_scope(*destnode, tipc_own_addr))
 615                 return 0;
 616
 617         read_lock_bh(&tipc_nametbl_lock);
 618         seq = nametbl_find_seq(type);
 619         if (unlikely(!seq))
 620                 goto not_found;
 621         sseq = nameseq_find_subseq(seq, instance);
 622         if (unlikely(!sseq))
 623                 goto not_found;
 624         spin_lock_bh(&seq->lock);
 625
 626         /* Closest-First Algorithm: */
 627         if (likely(!*destnode)) {
 628                 publ = sseq->node_list;
 629                 if (publ) {
 630                         sseq->node_list = publ->node_list_next;
 631 found:
 632                         ref = publ->ref;
 633                         *destnode = publ->node;
 634                         spin_unlock_bh(&seq->lock);
 635                         read_unlock_bh(&tipc_nametbl_lock);
 636                         return ref;
 637                 }
 638                 publ = sseq->cluster_list;
 639                 if (publ) {
 640                         sseq->cluster_list = publ->cluster_list_next;
 641                         goto found;
 642                 }
 643                 publ = sseq->zone_list;
 644                 if (publ) {
 645                         sseq->zone_list = publ->zone_list_next;
 646                         goto found;
 647                 }
 648         }
 649
 650         /* Round-Robin Algorithm: */
 651         else if (*destnode == tipc_own_addr) {
 652                 publ = sseq->node_list;
 653                 if (publ) {
 654                         sseq->node_list = publ->node_list_next;
 655                         goto found;
 656                 }
 657         } else if (in_own_cluster(*destnode)) {
 658                 publ = sseq->cluster_list;
 659                 if (publ) {
 660                         sseq->cluster_list = publ->cluster_list_next;
 661                         goto found;
 662                 }
 663         } else {
 664                 publ = sseq->zone_list;
 665                 if (publ) {
 666                         sseq->zone_list = publ->zone_list_next;
 667                         goto found;
 668                 }
 669         }
 670         spin_unlock_bh(&seq->lock);
 671 not_found:
 672         *destnode = 0;
 673         read_unlock_bh(&tipc_nametbl_lock);
 674         return 0;
 675 }
 676
 677 /**
 678  * tipc_nametbl_mc_translate - find multicast destinations
 679  *
 680  * Creates list of all local ports that overlap the given multicast address;
 681  * also determines if any off-node ports overlap.
 682  *
 683  * Note: Publications with a scope narrower than 'limit' are ignored.
 684  * (i.e. local node-scope publications mustn't receive messages arriving
 685  * from another node, even if the multcast link brought it here)
 686  *
 687  * Returns non-zero if any off-node ports overlap
 688  */
 689
 690 int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
 691                               struct port_list *dports)
 692 {
 693         struct name_seq *seq;
 694         struct sub_seq *sseq;
 695         struct sub_seq *sseq_stop;
 696         int res = 0;
 697
 698         read_lock_bh(&tipc_nametbl_lock);
 699         seq = nametbl_find_seq(type);
 700         if (!seq)
 701                 goto exit;
 702
 703         spin_lock_bh(&seq->lock);
 704
 705         sseq = seq->sseqs + nameseq_locate_subseq(seq, lower);
 706         sseq_stop = seq->sseqs + seq->first_free;
 707         for (; sseq != sseq_stop; sseq++) {
 708                 struct publication *publ;
 709
 710                 if (sseq->lower > upper)
 711                         break;
 712                 publ = sseq->cluster_list;
 713                 if (publ && (publ->scope <= limit))
 714                         do {
 715                                 if (publ->node == tipc_own_addr)
 716                                         tipc_port_list_add(dports, publ->ref);
 717                                 else
 718                                         res = 1;
 719                                 publ = publ->cluster_list_next;
 720                         } while (publ != sseq->cluster_list);
 721         }
 722
 723         spin_unlock_bh(&seq->lock);
 724 exit:
 725         read_unlock_bh(&tipc_nametbl_lock);
 726         return res;
 727 }
 728
 729 /**
 730  * tipc_nametbl_publish_rsv - publish port name using a reserved name type
 731  */
 732
 733 int tipc_nametbl_publish_rsv(u32 ref, unsigned int scope,
 734                         struct tipc_name_seq const *seq)
 735 {
 736         int res;
 737
 738         atomic_inc(&rsv_publ_ok);
 739         res = tipc_publish(ref, scope, seq);
 740         atomic_dec(&rsv_publ_ok);
 741         return res;
 742 }
 743
 744 /**
 745  * tipc_nametbl_publish - add name publication to network name tables
 746  */
 747
 748 struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
 749                                     u32 scope, u32 port_ref, u32 key)
 750 {
 751         struct publication *publ;
 752
 753         if (table.local_publ_count >= tipc_max_publications) {
 754                 warn("Publication failed, local publication limit reached (%u)\n",
 755                      tipc_max_publications);
 756                 return NULL;
 757         }
 758         if ((type < TIPC_RESERVED_TYPES) && !atomic_read(&rsv_publ_ok)) {
 759                 warn("Publication failed, reserved name {%u,%u,%u}\n",
 760                      type, lower, upper);
 761                 return NULL;
 762         }
 763
 764         write_lock_bh(&tipc_nametbl_lock);
 765         table.local_publ_count++;
 766         publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
 767                                    tipc_own_addr, port_ref, key);
 768         if (publ && (scope != TIPC_NODE_SCOPE)) {
 769                 tipc_named_publish(publ);
 770         }
 771         write_unlock_bh(&tipc_nametbl_lock);
 772         return publ;
 773 }
 774
 775 /**
 776  * tipc_nametbl_withdraw - withdraw name publication from network name tables
 777  */
 778
 779 int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
 780 {
 781         struct publication *publ;
 782
 783         dbg("tipc_nametbl_withdraw: {%u,%u}, key=%u\n", type, lower, key);
 784         write_lock_bh(&tipc_nametbl_lock);
 785         publ = tipc_nametbl_remove_publ(type, lower, tipc_own_addr, ref, key);
 786         if (likely(publ)) {
 787                 table.local_publ_count--;
 788                 if (publ->scope != TIPC_NODE_SCOPE)
 789                         tipc_named_withdraw(publ);
 790                 write_unlock_bh(&tipc_nametbl_lock);
 791                 list_del_init(&publ->pport_list);
 792                 kfree(publ);
 793                 return 1;
 794         }
 795         write_unlock_bh(&tipc_nametbl_lock);
 796         err("Unable to remove local publication\n"
 797             "(type=%u, lower=%u, ref=%u, key=%u)\n",
 798             type, lower, ref, key);
 799         return 0;
 800 }
 801
 802 /**
 803  * tipc_nametbl_subscribe - add a subscription object to the name table
 804  */
 805
 806 void tipc_nametbl_subscribe(struct subscription *s)
 807 {
 808         u32 type = s->seq.type;
 809         struct name_seq *seq;
 810
 811         write_lock_bh(&tipc_nametbl_lock);
 812         seq = nametbl_find_seq(type);
 813         if (!seq) {
 814                 seq = tipc_nameseq_create(type, &table.types[hash(type)]);
 815         }
 816         if (seq){
 817                 spin_lock_bh(&seq->lock);
 818                 dbg("tipc_nametbl_subscribe:found %p for {%u,%u,%u}\n",
 819                     seq, type, s->seq.lower, s->seq.upper);
 820                 tipc_nameseq_subscribe(seq, s);
 821                 spin_unlock_bh(&seq->lock);
 822         } else {
 823                 warn("Failed to create subscription for {%u,%u,%u}\n",
 824                      s->seq.type, s->seq.lower, s->seq.upper);
 825         }
 826         write_unlock_bh(&tipc_nametbl_lock);
 827 }
 828
 829 /**
 830  * tipc_nametbl_unsubscribe - remove a subscription object from name table
 831  */
 832
 833 void tipc_nametbl_unsubscribe(struct subscription *s)
 834 {
 835         struct name_seq *seq;
 836
 837         write_lock_bh(&tipc_nametbl_lock);
 838         seq = nametbl_find_seq(s->seq.type);
 839         if (seq != NULL){
 840                 spin_lock_bh(&seq->lock);
 841                 list_del_init(&s->nameseq_list);
 842                 spin_unlock_bh(&seq->lock);
 843                 if ((seq->first_free == 0) && list_empty(&seq->subscriptions)) {
 844                         hlist_del_init(&seq->ns_list);
 845                         kfree(seq->sseqs);
 846                         kfree(seq);
 847                 }
 848         }
 849         write_unlock_bh(&tipc_nametbl_lock);
 850 }
 851
 852
 853 /**
 854  * subseq_list: print specified sub-sequence contents into the given buffer
 855  */
 856
 857 static void subseq_list(struct sub_seq *sseq, struct print_buf *buf, u32 depth,
 858                         u32 index)
 859 {
 860         char portIdStr[27];
 861         char *scopeStr;
 862         struct publication *publ = sseq->zone_list;
 863
 864         tipc_printf(buf, "%-10u %-10u ", sseq->lower, sseq->upper);
 865
 866         if (depth == 2 || !publ) {
 867                 tipc_printf(buf, "\n");
 868                 return;
 869         }
 870
 871         do {
 872                 sprintf (portIdStr, "<%u.%u.%u:%u>",
 873                          tipc_zone(publ->node), tipc_cluster(publ->node),
 874                          tipc_node(publ->node), publ->ref);
 875                 tipc_printf(buf, "%-26s ", portIdStr);
 876                 if (depth > 3) {
 877                         if (publ->node != tipc_own_addr)
 878                                 scopeStr = "";
 879                         else if (publ->scope == TIPC_NODE_SCOPE)
 880                                 scopeStr = "node";
 881                         else if (publ->scope == TIPC_CLUSTER_SCOPE)
 882                                 scopeStr = "cluster";
 883                         else
 884                                 scopeStr = "zone";
 885                         tipc_printf(buf, "%-10u %s", publ->key, scopeStr);
 886                 }
 887
 888                 publ = publ->zone_list_next;
 889                 if (publ == sseq->zone_list)
 890                         break;
 891
 892                 tipc_printf(buf, "\n%33s", " ");
 893         } while (1);
 894
 895         tipc_printf(buf, "\n");
 896 }
 897
 898 /**
 899  * nameseq_list: print specified name sequence contents into the given buffer
 900  */
 901
 902 static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
 903                          u32 type, u32 lowbound, u32 upbound, u32 index)
 904 {
 905         struct sub_seq *sseq;
 906         char typearea[11];
 907
 908         sprintf(typearea, "%-10u", seq->type);
 909
 910         if (depth == 1) {
 911                 tipc_printf(buf, "%s\n", typearea);
 912                 return;
 913         }
 914
 915         for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
 916                 if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
 917                         tipc_printf(buf, "%s ", typearea);
 918                         subseq_list(sseq, buf, depth, index);
 919                         sprintf(typearea, "%10s", " ");
 920                 }
 921         }
 922 }
 923
 924 /**
 925  * nametbl_header - print name table header into the given buffer
 926  */
 927
 928 static void nametbl_header(struct print_buf *buf, u32 depth)
 929 {
 930         tipc_printf(buf, "Type       ");
 931
 932         if (depth > 1)
 933                 tipc_printf(buf, "Lower      Upper      ");
 934         if (depth > 2)
 935                 tipc_printf(buf, "Port Identity              ");
 936         if (depth > 3)
 937                 tipc_printf(buf, "Publication");
 938
 939         tipc_printf(buf, "\n-----------");
 940
 941         if (depth > 1)
 942                 tipc_printf(buf, "--------------------- ");
 943         if (depth > 2)
 944                 tipc_printf(buf, "-------------------------- ");
 945         if (depth > 3)
 946                 tipc_printf(buf, "------------------");
 947
 948         tipc_printf(buf, "\n");
 949 }
 950
 951 /**
 952  * nametbl_list - print specified name table contents into the given buffer
 953  */
 954
 955 static void nametbl_list(struct print_buf *buf, u32 depth_info,
 956                          u32 type, u32 lowbound, u32 upbound)
 957 {
 958         struct hlist_head *seq_head;
 959         struct hlist_node *seq_node;
 960         struct name_seq *seq;
 961         int all_types;
 962         u32 depth;
 963         u32 i;
 964
 965         all_types = (depth_info & TIPC_NTQ_ALLTYPES);
 966         depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
 967
 968         if (depth == 0)
 969                 return;
 970
 971         if (all_types) {
 972                 /* display all entries in name table to specified depth */
 973                 nametbl_header(buf, depth);
 974                 lowbound = 0;
 975                 upbound = ~0;
 976                 for (i = 0; i < tipc_nametbl_size; i++) {
 977                         seq_head = &table.types[i];
 978                         hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
 979                                 nameseq_list(seq, buf, depth, seq->type,
 980                                              lowbound, upbound, i);
 981                         }
 982                 }
 983         } else {
 984                 /* display only the sequence that matches the specified type */
 985                 if (upbound < lowbound) {
 986                         tipc_printf(buf, "invalid name sequence specified\n");
 987                         return;
 988                 }
 989                 nametbl_header(buf, depth);
 990                 i = hash(type);
 991                 seq_head = &table.types[i];
 992                 hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
 993                         if (seq->type == type) {
 994                                 nameseq_list(seq, buf, depth, type,
 995                                              lowbound, upbound, i);
 996                                 break;
 997                         }
 998                 }
 999         }
1000 }
1001
1002 #if 0
1003 void tipc_nametbl_print(struct print_buf *buf, const char *str)
1004 {
1005         tipc_printf(buf, str);
1006         read_lock_bh(&tipc_nametbl_lock);
1007         nametbl_list(buf, 0, 0, 0, 0);
1008         read_unlock_bh(&tipc_nametbl_lock);
1009 }
1010 #endif
1011
1012 #define MAX_NAME_TBL_QUERY 32768
1013
1014 struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space)
1015 {
1016         struct sk_buff *buf;
1017         struct tipc_name_table_query *argv;
1018         struct tlv_desc *rep_tlv;
1019         struct print_buf b;
1020         int str_len;
1021
1022         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NAME_TBL_QUERY))
1023                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
1024
1025         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_NAME_TBL_QUERY));
1026         if (!buf)
1027                 return NULL;
1028
1029         rep_tlv = (struct tlv_desc *)buf->data;
1030         tipc_printbuf_init(&b, TLV_DATA(rep_tlv), MAX_NAME_TBL_QUERY);
1031         argv = (struct tipc_name_table_query *)TLV_DATA(req_tlv_area);
1032         read_lock_bh(&tipc_nametbl_lock);
1033         nametbl_list(&b, ntohl(argv->depth), ntohl(argv->type),
1034                      ntohl(argv->lowbound), ntohl(argv->upbound));
1035         read_unlock_bh(&tipc_nametbl_lock);
1036         str_len = tipc_printbuf_validate(&b);
1037
1038         skb_put(buf, TLV_SPACE(str_len));
1039         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
1040
1041         return buf;
1042 }
1043
1044 #if 0
1045 void tipc_nametbl_dump(void)
1046 {
1047         nametbl_list(TIPC_CONS, 0, 0, 0, 0);
1048 }
1049 #endif
1050
1051 int tipc_nametbl_init(void)
1052 {
1053         table.types = kcalloc(tipc_nametbl_size, sizeof(struct hlist_head),
1054                               GFP_ATOMIC);
1055         if (!table.types)
1056                 return -ENOMEM;
1057
1058         table.local_publ_count = 0;
1059         return 0;
1060 }
1061
1062 void tipc_nametbl_stop(void)
1063 {
1064         u32 i;
1065
1066         if (!table.types)
1067                 return;
1068
1069         /* Verify name table is empty, then release it */
1070
1071         write_lock_bh(&tipc_nametbl_lock);
1072         for (i = 0; i < tipc_nametbl_size; i++) {
1073                 if (!hlist_empty(&table.types[i]))
1074                         err("tipc_nametbl_stop(): hash chain %u is non-null\n", i);
1075         }
1076         kfree(table.types);
1077         table.types = NULL;
1078         write_unlock_bh(&tipc_nametbl_lock);
1079 }
1080