net/tipc/cluster.c

   1 /*
   2  * net/tipc/cluster.c: TIPC cluster management routines
   3  *
   4  * Copyright (c) 2000-2006, Ericsson AB
   5  * Copyright (c) 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 "cluster.h"
  39 #include "addr.h"
  40 #include "node_subscr.h"
  41 #include "link.h"
  42 #include "node.h"
  43 #include "net.h"
  44 #include "msg.h"
  45 #include "bearer.h"
  46
  47 static void tipc_cltr_multicast(struct cluster *c_ptr, struct sk_buff *buf,
  48                                 u32 lower, u32 upper);
  49 static struct sk_buff *tipc_cltr_prepare_routing_msg(u32 data_size, u32 dest);
  50
  51 struct node **tipc_local_nodes = NULL;
  52 struct node_map tipc_cltr_bcast_nodes = {0,{0,}};
  53 u32 tipc_highest_allowed_slave = 0;
  54
  55 struct cluster *tipc_cltr_create(u32 addr)
  56 {
  57         struct _zone *z_ptr;
  58         struct cluster *c_ptr;
  59         int max_nodes;
  60
  61         c_ptr = kzalloc(sizeof(*c_ptr), GFP_ATOMIC);
  62         if (c_ptr == NULL) {
  63                 warn("Cluster creation failure, no memory\n");
  64                 return NULL;
  65         }
  66
  67         c_ptr->addr = tipc_addr(tipc_zone(addr), tipc_cluster(addr), 0);
  68         if (in_own_cluster(addr))
  69                 max_nodes = LOWEST_SLAVE + tipc_max_slaves;
  70         else
  71                 max_nodes = tipc_max_nodes + 1;
  72
  73         c_ptr->nodes = kcalloc(max_nodes + 1, sizeof(void*), GFP_ATOMIC);
  74         if (c_ptr->nodes == NULL) {
  75                 warn("Cluster creation failure, no memory for node area\n");
  76                 kfree(c_ptr);
  77                 return NULL;
  78         }
  79
  80         if (in_own_cluster(addr))
  81                 tipc_local_nodes = c_ptr->nodes;
  82         c_ptr->highest_slave = LOWEST_SLAVE - 1;
  83         c_ptr->highest_node = 0;
  84
  85         z_ptr = tipc_zone_find(tipc_zone(addr));
  86         if (!z_ptr) {
  87                 z_ptr = tipc_zone_create(addr);
  88         }
  89         if (!z_ptr) {
  90                 kfree(c_ptr->nodes);
  91                 kfree(c_ptr);
  92                 return NULL;
  93         }
  94
  95         tipc_zone_attach_cluster(z_ptr, c_ptr);
  96         c_ptr->owner = z_ptr;
  97         return c_ptr;
  98 }
  99
 100 void tipc_cltr_delete(struct cluster *c_ptr)
 101 {
 102         u32 n_num;
 103
 104         if (!c_ptr)
 105                 return;
 106         for (n_num = 1; n_num <= c_ptr->highest_node; n_num++) {
 107                 tipc_node_delete(c_ptr->nodes[n_num]);
 108         }
 109         for (n_num = LOWEST_SLAVE; n_num <= c_ptr->highest_slave; n_num++) {
 110                 tipc_node_delete(c_ptr->nodes[n_num]);
 111         }
 112         kfree(c_ptr->nodes);
 113         kfree(c_ptr);
 114 }
 115
 116 u32 tipc_cltr_next_node(struct cluster *c_ptr, u32 addr)
 117 {
 118         struct node *n_ptr;
 119         u32 n_num = tipc_node(addr) + 1;
 120
 121         if (!c_ptr)
 122                 return addr;
 123         for (; n_num <= c_ptr->highest_node; n_num++) {
 124                 n_ptr = c_ptr->nodes[n_num];
 125                 if (n_ptr && tipc_node_has_active_links(n_ptr))
 126                         return n_ptr->addr;
 127         }
 128         for (n_num = 1; n_num < tipc_node(addr); n_num++) {
 129                 n_ptr = c_ptr->nodes[n_num];
 130                 if (n_ptr && tipc_node_has_active_links(n_ptr))
 131                         return n_ptr->addr;
 132         }
 133         return 0;
 134 }
 135
 136 void tipc_cltr_attach_node(struct cluster *c_ptr, struct node *n_ptr)
 137 {
 138         u32 n_num = tipc_node(n_ptr->addr);
 139         u32 max_n_num = tipc_max_nodes;
 140
 141         if (in_own_cluster(n_ptr->addr))
 142                 max_n_num = tipc_highest_allowed_slave;
 143         assert(n_num > 0);
 144         assert(n_num <= max_n_num);
 145         assert(c_ptr->nodes[n_num] == NULL);
 146         c_ptr->nodes[n_num] = n_ptr;
 147         if (n_num > c_ptr->highest_node)
 148                 c_ptr->highest_node = n_num;
 149 }
 150
 151 /**
 152  * tipc_cltr_select_router - select router to a cluster
 153  *
 154  * Uses deterministic and fair algorithm.
 155  */
 156
 157 u32 tipc_cltr_select_router(struct cluster *c_ptr, u32 ref)
 158 {
 159         u32 n_num;
 160         u32 ulim = c_ptr->highest_node;
 161         u32 mask;
 162         u32 tstart;
 163
 164         assert(!in_own_cluster(c_ptr->addr));
 165         if (!ulim)
 166                 return 0;
 167
 168         /* Start entry must be random */
 169         mask = tipc_max_nodes;
 170         while (mask > ulim)
 171                 mask >>= 1;
 172         tstart = ref & mask;
 173         n_num = tstart;
 174
 175         /* Lookup upwards with wrap-around */
 176         do {
 177                 if (tipc_node_is_up(c_ptr->nodes[n_num]))
 178                         break;
 179         } while (++n_num <= ulim);
 180         if (n_num > ulim) {
 181                 n_num = 1;
 182                 do {
 183                         if (tipc_node_is_up(c_ptr->nodes[n_num]))
 184                                 break;
 185                 } while (++n_num < tstart);
 186                 if (n_num == tstart)
 187                         return 0;
 188         }
 189         assert(n_num <= ulim);
 190         return tipc_node_select_router(c_ptr->nodes[n_num], ref);
 191 }
 192
 193 /**
 194  * tipc_cltr_select_node - select destination node within a remote cluster
 195  *
 196  * Uses deterministic and fair algorithm.
 197  */
 198
 199 struct node *tipc_cltr_select_node(struct cluster *c_ptr, u32 selector)
 200 {
 201         u32 n_num;
 202         u32 mask = tipc_max_nodes;
 203         u32 start_entry;
 204
 205         assert(!in_own_cluster(c_ptr->addr));
 206         if (!c_ptr->highest_node)
 207                 return NULL;
 208
 209         /* Start entry must be random */
 210         while (mask > c_ptr->highest_node) {
 211                 mask >>= 1;
 212         }
 213         start_entry = (selector & mask) ? selector & mask : 1u;
 214         assert(start_entry <= c_ptr->highest_node);
 215
 216         /* Lookup upwards with wrap-around */
 217         for (n_num = start_entry; n_num <= c_ptr->highest_node; n_num++) {
 218                 if (tipc_node_has_active_links(c_ptr->nodes[n_num]))
 219                         return c_ptr->nodes[n_num];
 220         }
 221         for (n_num = 1; n_num < start_entry; n_num++) {
 222                 if (tipc_node_has_active_links(c_ptr->nodes[n_num]))
 223                         return c_ptr->nodes[n_num];
 224         }
 225         return NULL;
 226 }
 227
 228 /*
 229  *    Routing table management: See description in node.c
 230  */
 231
 232 static struct sk_buff *tipc_cltr_prepare_routing_msg(u32 data_size, u32 dest)
 233 {
 234         u32 size = INT_H_SIZE + data_size;
 235         struct sk_buff *buf = buf_acquire(size);
 236         struct tipc_msg *msg;
 237
 238         if (buf) {
 239                 msg = buf_msg(buf);
 240                 memset((char *)msg, 0, size);
 241                 msg_init(msg, ROUTE_DISTRIBUTOR, 0, INT_H_SIZE, dest);
 242         }
 243         return buf;
 244 }
 245
 246 void tipc_cltr_bcast_new_route(struct cluster *c_ptr, u32 dest,
 247                              u32 lower, u32 upper)
 248 {
 249         struct sk_buff *buf = tipc_cltr_prepare_routing_msg(0, c_ptr->addr);
 250         struct tipc_msg *msg;
 251
 252         if (buf) {
 253                 msg = buf_msg(buf);
 254                 msg_set_remote_node(msg, dest);
 255                 msg_set_type(msg, ROUTE_ADDITION);
 256                 tipc_cltr_multicast(c_ptr, buf, lower, upper);
 257         } else {
 258                 warn("Memory squeeze: broadcast of new route failed\n");
 259         }
 260 }
 261
 262 void tipc_cltr_bcast_lost_route(struct cluster *c_ptr, u32 dest,
 263                                 u32 lower, u32 upper)
 264 {
 265         struct sk_buff *buf = tipc_cltr_prepare_routing_msg(0, c_ptr->addr);
 266         struct tipc_msg *msg;
 267
 268         if (buf) {
 269                 msg = buf_msg(buf);
 270                 msg_set_remote_node(msg, dest);
 271                 msg_set_type(msg, ROUTE_REMOVAL);
 272                 tipc_cltr_multicast(c_ptr, buf, lower, upper);
 273         } else {
 274                 warn("Memory squeeze: broadcast of lost route failed\n");
 275         }
 276 }
 277
 278 void tipc_cltr_send_slave_routes(struct cluster *c_ptr, u32 dest)
 279 {
 280         struct sk_buff *buf;
 281         struct tipc_msg *msg;
 282         u32 highest = c_ptr->highest_slave;
 283         u32 n_num;
 284         int send = 0;
 285
 286         assert(!is_slave(dest));
 287         assert(in_own_cluster(dest));
 288         assert(in_own_cluster(c_ptr->addr));
 289         if (highest <= LOWEST_SLAVE)
 290                 return;
 291         buf = tipc_cltr_prepare_routing_msg(highest - LOWEST_SLAVE + 1,
 292                                             c_ptr->addr);
 293         if (buf) {
 294                 msg = buf_msg(buf);
 295                 msg_set_remote_node(msg, c_ptr->addr);
 296                 msg_set_type(msg, SLAVE_ROUTING_TABLE);
 297                 for (n_num = LOWEST_SLAVE; n_num <= highest; n_num++) {
 298                         if (c_ptr->nodes[n_num] &&
 299                             tipc_node_has_active_links(c_ptr->nodes[n_num])) {
 300                                 send = 1;
 301                                 msg_set_dataoctet(msg, n_num);
 302                         }
 303                 }
 304                 if (send)
 305                         tipc_link_send(buf, dest, dest);
 306                 else
 307                         buf_discard(buf);
 308         } else {
 309                 warn("Memory squeeze: broadcast of lost route failed\n");
 310         }
 311 }
 312
 313 void tipc_cltr_send_ext_routes(struct cluster *c_ptr, u32 dest)
 314 {
 315         struct sk_buff *buf;
 316         struct tipc_msg *msg;
 317         u32 highest = c_ptr->highest_node;
 318         u32 n_num;
 319         int send = 0;
 320
 321         if (in_own_cluster(c_ptr->addr))
 322                 return;
 323         assert(!is_slave(dest));
 324         assert(in_own_cluster(dest));
 325         highest = c_ptr->highest_node;
 326         buf = tipc_cltr_prepare_routing_msg(highest + 1, c_ptr->addr);
 327         if (buf) {
 328                 msg = buf_msg(buf);
 329                 msg_set_remote_node(msg, c_ptr->addr);
 330                 msg_set_type(msg, EXT_ROUTING_TABLE);
 331                 for (n_num = 1; n_num <= highest; n_num++) {
 332                         if (c_ptr->nodes[n_num] &&
 333                             tipc_node_has_active_links(c_ptr->nodes[n_num])) {
 334                                 send = 1;
 335                                 msg_set_dataoctet(msg, n_num);
 336                         }
 337                 }
 338                 if (send)
 339                         tipc_link_send(buf, dest, dest);
 340                 else
 341                         buf_discard(buf);
 342         } else {
 343                 warn("Memory squeeze: broadcast of external route failed\n");
 344         }
 345 }
 346
 347 void tipc_cltr_send_local_routes(struct cluster *c_ptr, u32 dest)
 348 {
 349         struct sk_buff *buf;
 350         struct tipc_msg *msg;
 351         u32 highest = c_ptr->highest_node;
 352         u32 n_num;
 353         int send = 0;
 354
 355         assert(is_slave(dest));
 356         assert(in_own_cluster(c_ptr->addr));
 357         buf = tipc_cltr_prepare_routing_msg(highest, c_ptr->addr);
 358         if (buf) {
 359                 msg = buf_msg(buf);
 360                 msg_set_remote_node(msg, c_ptr->addr);
 361                 msg_set_type(msg, LOCAL_ROUTING_TABLE);
 362                 for (n_num = 1; n_num <= highest; n_num++) {
 363                         if (c_ptr->nodes[n_num] &&
 364                             tipc_node_has_active_links(c_ptr->nodes[n_num])) {
 365                                 send = 1;
 366                                 msg_set_dataoctet(msg, n_num);
 367                         }
 368                 }
 369                 if (send)
 370                         tipc_link_send(buf, dest, dest);
 371                 else
 372                         buf_discard(buf);
 373         } else {
 374                 warn("Memory squeeze: broadcast of local route failed\n");
 375         }
 376 }
 377
 378 void tipc_cltr_recv_routing_table(struct sk_buff *buf)
 379 {
 380         struct tipc_msg *msg = buf_msg(buf);
 381         struct cluster *c_ptr;
 382         struct node *n_ptr;
 383         unchar *node_table;
 384         u32 table_size;
 385         u32 router;
 386         u32 rem_node = msg_remote_node(msg);
 387         u32 z_num;
 388         u32 c_num;
 389         u32 n_num;
 390
 391         c_ptr = tipc_cltr_find(rem_node);
 392         if (!c_ptr) {
 393                 c_ptr = tipc_cltr_create(rem_node);
 394                 if (!c_ptr) {
 395                         buf_discard(buf);
 396                         return;
 397                 }
 398         }
 399
 400         node_table = buf->data + msg_hdr_sz(msg);
 401         table_size = msg_size(msg) - msg_hdr_sz(msg);
 402         router = msg_prevnode(msg);
 403         z_num = tipc_zone(rem_node);
 404         c_num = tipc_cluster(rem_node);
 405
 406         switch (msg_type(msg)) {
 407         case LOCAL_ROUTING_TABLE:
 408                 assert(is_slave(tipc_own_addr));
 409         case EXT_ROUTING_TABLE:
 410                 for (n_num = 1; n_num < table_size; n_num++) {
 411                         if (node_table[n_num]) {
 412                                 u32 addr = tipc_addr(z_num, c_num, n_num);
 413                                 n_ptr = c_ptr->nodes[n_num];
 414                                 if (!n_ptr) {
 415                                         n_ptr = tipc_node_create(addr);
 416                                 }
 417                                 if (n_ptr)
 418                                         tipc_node_add_router(n_ptr, router);
 419                         }
 420                 }
 421                 break;
 422         case SLAVE_ROUTING_TABLE:
 423                 assert(!is_slave(tipc_own_addr));
 424                 assert(in_own_cluster(c_ptr->addr));
 425                 for (n_num = 1; n_num < table_size; n_num++) {
 426                         if (node_table[n_num]) {
 427                                 u32 slave_num = n_num + LOWEST_SLAVE;
 428                                 u32 addr = tipc_addr(z_num, c_num, slave_num);
 429                                 n_ptr = c_ptr->nodes[slave_num];
 430                                 if (!n_ptr) {
 431                                         n_ptr = tipc_node_create(addr);
 432                                 }
 433                                 if (n_ptr)
 434                                         tipc_node_add_router(n_ptr, router);
 435                         }
 436                 }
 437                 break;
 438         case ROUTE_ADDITION:
 439                 if (!is_slave(tipc_own_addr)) {
 440                         assert(!in_own_cluster(c_ptr->addr)
 441                                || is_slave(rem_node));
 442                 } else {
 443                         assert(in_own_cluster(c_ptr->addr)
 444                                && !is_slave(rem_node));
 445                 }
 446                 n_ptr = c_ptr->nodes[tipc_node(rem_node)];
 447                 if (!n_ptr)
 448                         n_ptr = tipc_node_create(rem_node);
 449                 if (n_ptr)
 450                         tipc_node_add_router(n_ptr, router);
 451                 break;
 452         case ROUTE_REMOVAL:
 453                 if (!is_slave(tipc_own_addr)) {
 454                         assert(!in_own_cluster(c_ptr->addr)
 455                                || is_slave(rem_node));
 456                 } else {
 457                         assert(in_own_cluster(c_ptr->addr)
 458                                && !is_slave(rem_node));
 459                 }
 460                 n_ptr = c_ptr->nodes[tipc_node(rem_node)];
 461                 if (n_ptr)
 462                         tipc_node_remove_router(n_ptr, router);
 463                 break;
 464         default:
 465                 assert(!"Illegal routing manager message received\n");
 466         }
 467         buf_discard(buf);
 468 }
 469
 470 void tipc_cltr_remove_as_router(struct cluster *c_ptr, u32 router)
 471 {
 472         u32 start_entry;
 473         u32 tstop;
 474         u32 n_num;
 475
 476         if (is_slave(router))
 477                 return; /* Slave nodes can not be routers */
 478
 479         if (in_own_cluster(c_ptr->addr)) {
 480                 start_entry = LOWEST_SLAVE;
 481                 tstop = c_ptr->highest_slave;
 482         } else {
 483                 start_entry = 1;
 484                 tstop = c_ptr->highest_node;
 485         }
 486
 487         for (n_num = start_entry; n_num <= tstop; n_num++) {
 488                 if (c_ptr->nodes[n_num]) {
 489                         tipc_node_remove_router(c_ptr->nodes[n_num], router);
 490                 }
 491         }
 492 }
 493
 494 /**
 495  * tipc_cltr_multicast - multicast message to local nodes
 496  */
 497
 498 static void tipc_cltr_multicast(struct cluster *c_ptr, struct sk_buff *buf,
 499                          u32 lower, u32 upper)
 500 {
 501         struct sk_buff *buf_copy;
 502         struct node *n_ptr;
 503         u32 n_num;
 504         u32 tstop;
 505
 506         assert(lower <= upper);
 507         assert(((lower >= 1) && (lower <= tipc_max_nodes)) ||
 508                ((lower >= LOWEST_SLAVE) && (lower <= tipc_highest_allowed_slave)));
 509         assert(((upper >= 1) && (upper <= tipc_max_nodes)) ||
 510                ((upper >= LOWEST_SLAVE) && (upper <= tipc_highest_allowed_slave)));
 511         assert(in_own_cluster(c_ptr->addr));
 512
 513         tstop = is_slave(upper) ? c_ptr->highest_slave : c_ptr->highest_node;
 514         if (tstop > upper)
 515                 tstop = upper;
 516         for (n_num = lower; n_num <= tstop; n_num++) {
 517                 n_ptr = c_ptr->nodes[n_num];
 518                 if (n_ptr && tipc_node_has_active_links(n_ptr)) {
 519                         buf_copy = skb_copy(buf, GFP_ATOMIC);
 520                         if (buf_copy == NULL)
 521                                 break;
 522                         msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
 523                         tipc_link_send(buf_copy, n_ptr->addr, n_ptr->addr);
 524                 }
 525         }
 526         buf_discard(buf);
 527 }
 528
 529 /**
 530  * tipc_cltr_broadcast - broadcast message to all nodes within cluster
 531  */
 532
 533 void tipc_cltr_broadcast(struct sk_buff *buf)
 534 {
 535         struct sk_buff *buf_copy;
 536         struct cluster *c_ptr;
 537         struct node *n_ptr;
 538         u32 n_num;
 539         u32 tstart;
 540         u32 tstop;
 541         u32 node_type;
 542
 543         if (tipc_mode == TIPC_NET_MODE) {
 544                 c_ptr = tipc_cltr_find(tipc_own_addr);
 545                 assert(in_own_cluster(c_ptr->addr));    /* For now */
 546
 547                 /* Send to standard nodes, then repeat loop sending to slaves */
 548                 tstart = 1;
 549                 tstop = c_ptr->highest_node;
 550                 for (node_type = 1; node_type <= 2; node_type++) {
 551                         for (n_num = tstart; n_num <= tstop; n_num++) {
 552                                 n_ptr = c_ptr->nodes[n_num];
 553                                 if (n_ptr && tipc_node_has_active_links(n_ptr)) {
 554                                         buf_copy = skb_copy(buf, GFP_ATOMIC);
 555                                         if (buf_copy == NULL)
 556                                                 goto exit;
 557                                         msg_set_destnode(buf_msg(buf_copy),
 558                                                          n_ptr->addr);
 559                                         tipc_link_send(buf_copy, n_ptr->addr,
 560                                                        n_ptr->addr);
 561                                 }
 562                         }
 563                         tstart = LOWEST_SLAVE;
 564                         tstop = c_ptr->highest_slave;
 565                 }
 566         }
 567 exit:
 568         buf_discard(buf);
 569 }
 570
 571 int tipc_cltr_init(void)
 572 {
 573         tipc_highest_allowed_slave = LOWEST_SLAVE + tipc_max_slaves;
 574         return tipc_cltr_create(tipc_own_addr) ? 0 : -ENOMEM;
 575 }
 576