net/tipc/config.c

   1 /*
   2  * net/tipc/config.c: TIPC configuration management code
   3  *
   4  * Copyright (c) 2003-2005, Ericsson Research Canada
   5  * Copyright (c) 2004-2005, Wind River Systems
   6  * Copyright (c) 2005-2006, Ericsson AB
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the names of the copyright holders nor the names of its
  18  *    contributors may be used to endorse or promote products derived from
  19  *    this software without specific prior written permission.
  20  *
  21  * Alternatively, this software may be distributed under the terms of the
  22  * GNU General Public License ("GPL") version 2 as published by the Free
  23  * Software Foundation.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  26  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  29  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include "core.h"
  39 #include "dbg.h"
  40 #include "bearer.h"
  41 #include "port.h"
  42 #include "link.h"
  43 #include "zone.h"
  44 #include "addr.h"
  45 #include "name_table.h"
  46 #include "node.h"
  47 #include "config.h"
  48 #include "discover.h"
  49
  50 struct subscr_data {
  51         char usr_handle[8];
  52         u32 domain;
  53         u32 port_ref;
  54         struct list_head subd_list;
  55 };
  56
  57 struct manager {
  58         u32 user_ref;
  59         u32 port_ref;
  60         u32 subscr_ref;
  61         u32 link_subscriptions;
  62         struct list_head link_subscribers;
  63 };
  64
  65 static struct manager mng = { 0};
  66
  67 static spinlock_t config_lock = SPIN_LOCK_UNLOCKED;
  68
  69 static const void *req_tlv_area;        /* request message TLV area */
  70 static int req_tlv_space;               /* request message TLV area size */
  71 static int rep_headroom;                /* reply message headroom to use */
  72
  73
  74 void cfg_link_event(u32 addr, char *name, int up)
  75 {
  76         /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
  77 }
  78
  79
  80 struct sk_buff *cfg_reply_alloc(int payload_size)
  81 {
  82         struct sk_buff *buf;
  83
  84         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
  85         if (buf)
  86                 skb_reserve(buf, rep_headroom);
  87         return buf;
  88 }
  89
  90 int cfg_append_tlv(struct sk_buff *buf, int tlv_type,
  91                    void *tlv_data, int tlv_data_size)
  92 {
  93         struct tlv_desc *tlv = (struct tlv_desc *)buf->tail;
  94         int new_tlv_space = TLV_SPACE(tlv_data_size);
  95
  96         if (skb_tailroom(buf) < new_tlv_space) {
  97                 dbg("cfg_append_tlv unable to append TLV\n");
  98                 return 0;
  99         }
 100         skb_put(buf, new_tlv_space);
 101         tlv->tlv_type = htons(tlv_type);
 102         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
 103         if (tlv_data_size && tlv_data)
 104                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
 105         return 1;
 106 }
 107
 108 struct sk_buff *cfg_reply_unsigned_type(u16 tlv_type, u32 value)
 109 {
 110         struct sk_buff *buf;
 111         u32 value_net;
 112
 113         buf = cfg_reply_alloc(TLV_SPACE(sizeof(value)));
 114         if (buf) {
 115                 value_net = htonl(value);
 116                 cfg_append_tlv(buf, tlv_type, &value_net,
 117                                sizeof(value_net));
 118         }
 119         return buf;
 120 }
 121
 122 struct sk_buff *cfg_reply_string_type(u16 tlv_type, char *string)
 123 {
 124         struct sk_buff *buf;
 125         int string_len = strlen(string) + 1;
 126
 127         buf = cfg_reply_alloc(TLV_SPACE(string_len));
 128         if (buf)
 129                 cfg_append_tlv(buf, tlv_type, string, string_len);
 130         return buf;
 131 }
 132
 133
 134
 135
 136 #if 0
 137
 138 /* Now obsolete code for handling commands not yet implemented the new way */
 139
 140 int tipc_cfg_cmd(const struct tipc_cmd_msg * msg,
 141                  char *data,
 142                  u32 sz,
 143                  u32 *ret_size,
 144                  struct tipc_portid *orig)
 145 {
 146         int rv = -EINVAL;
 147         u32 cmd = msg->cmd;
 148
 149         *ret_size = 0;
 150         switch (cmd) {
 151         case TIPC_REMOVE_LINK:
 152         case TIPC_CMD_BLOCK_LINK:
 153         case TIPC_CMD_UNBLOCK_LINK:
 154                 if (!cfg_check_connection(orig))
 155                         rv = link_control(msg->argv.link_name, msg->cmd, 0);
 156                 break;
 157         case TIPC_ESTABLISH:
 158                 {
 159                         int connected;
 160
 161                         tipc_isconnected(mng.conn_port_ref, &connected);
 162                         if (connected || !orig) {
 163                                 rv = TIPC_FAILURE;
 164                                 break;
 165                         }
 166                         rv = tipc_connect2port(mng.conn_port_ref, orig);
 167                         if (rv == TIPC_OK)
 168                                 orig = 0;
 169                         break;
 170                 }
 171         case TIPC_GET_PEER_ADDRESS:
 172                 *ret_size = link_peer_addr(msg->argv.link_name, data, sz);
 173                 break;
 174         case TIPC_GET_ROUTES:
 175                 rv = TIPC_OK;
 176                 break;
 177         default: {}
 178         }
 179         if (*ret_size)
 180                 rv = TIPC_OK;
 181         return rv;
 182 }
 183
 184 static void cfg_cmd_event(struct tipc_cmd_msg *msg,
 185                           char *data,
 186                           u32 sz,
 187                           struct tipc_portid const *orig)
 188 {
 189         int rv = -EINVAL;
 190         struct tipc_cmd_result_msg rmsg;
 191         struct iovec msg_sect[2];
 192         int *arg;
 193
 194         msg->cmd = ntohl(msg->cmd);
 195
 196         cfg_prepare_res_msg(msg->cmd, msg->usr_handle, rv, &rmsg, msg_sect,
 197                             data, 0);
 198         if (ntohl(msg->magic) != TIPC_MAGIC)
 199                 goto exit;
 200
 201         switch (msg->cmd) {
 202         case TIPC_CREATE_LINK:
 203                 if (!cfg_check_connection(orig))
 204                         rv = disc_create_link(&msg->argv.create_link);
 205                 break;
 206         case TIPC_LINK_SUBSCRIBE:
 207                 {
 208                         struct subscr_data *sub;
 209
 210                         if (mng.link_subscriptions > 64)
 211                                 break;
 212                         sub = (struct subscr_data *)kmalloc(sizeof(*sub),
 213                                                             GFP_ATOMIC);
 214                         if (sub == NULL) {
 215                                 warn("Memory squeeze; dropped remote link subscription\n");
 216                                 break;
 217                         }
 218                         INIT_LIST_HEAD(&sub->subd_list);
 219                         tipc_createport(mng.user_ref,
 220                                         (void *)sub,
 221                                         TIPC_HIGH_IMPORTANCE,
 222                                         0,
 223                                         0,
 224                                         (tipc_conn_shutdown_event)cfg_linksubscr_cancel,
 225                                         0,
 226                                         0,
 227                                         (tipc_conn_msg_event)cfg_linksubscr_cancel,
 228                                         0,
 229                                         &sub->port_ref);
 230                         if (!sub->port_ref) {
 231                                 kfree(sub);
 232                                 break;
 233                         }
 234                         memcpy(sub->usr_handle,msg->usr_handle,
 235                                sizeof(sub->usr_handle));
 236                         sub->domain = msg->argv.domain;
 237                         list_add_tail(&sub->subd_list, &mng.link_subscribers);
 238                         tipc_connect2port(sub->port_ref, orig);
 239                         rmsg.retval = TIPC_OK;
 240                         tipc_send(sub->port_ref, 2u, msg_sect);
 241                         mng.link_subscriptions++;
 242                         return;
 243                 }
 244         default:
 245                 rv = tipc_cfg_cmd(msg, data, sz, (u32 *)&msg_sect[1].iov_len, orig);
 246         }
 247         exit:
 248         rmsg.result_len = htonl(msg_sect[1].iov_len);
 249         rmsg.retval = htonl(rv);
 250         cfg_respond(msg_sect, 2u, orig);
 251 }
 252 #endif
 253
 254 static struct sk_buff *cfg_enable_bearer(void)
 255 {
 256         struct tipc_bearer_config *args;
 257
 258         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 259                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 260
 261         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 262         if (tipc_enable_bearer(args->name,
 263                                ntohl(args->detect_scope),
 264                                ntohl(args->priority)))
 265                 return cfg_reply_error_string("unable to enable bearer");
 266
 267         return cfg_reply_none();
 268 }
 269
 270 static struct sk_buff *cfg_disable_bearer(void)
 271 {
 272         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 273                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 274
 275         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 276                 return cfg_reply_error_string("unable to disable bearer");
 277
 278         return cfg_reply_none();
 279 }
 280
 281 static struct sk_buff *cfg_set_own_addr(void)
 282 {
 283         u32 addr;
 284
 285         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 286                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 287
 288         addr = *(u32 *)TLV_DATA(req_tlv_area);
 289         addr = ntohl(addr);
 290         if (addr == tipc_own_addr)
 291                 return cfg_reply_none();
 292         if (!addr_node_valid(addr))
 293                 return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 294                                               " (node address)");
 295         if (tipc_own_addr)
 296                 return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 297                                               " (cannot change node address once assigned)");
 298
 299         spin_unlock_bh(&config_lock);
 300         stop_net();
 301         tipc_own_addr = addr;
 302         start_net();
 303         spin_lock_bh(&config_lock);
 304         return cfg_reply_none();
 305 }
 306
 307 static struct sk_buff *cfg_set_remote_mng(void)
 308 {
 309         u32 value;
 310
 311         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 312                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 313
 314         value = *(u32 *)TLV_DATA(req_tlv_area);
 315         value = ntohl(value);
 316         tipc_remote_management = (value != 0);
 317         return cfg_reply_none();
 318 }
 319
 320 static struct sk_buff *cfg_set_max_publications(void)
 321 {
 322         u32 value;
 323
 324         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 325                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 326
 327         value = *(u32 *)TLV_DATA(req_tlv_area);
 328         value = ntohl(value);
 329         if (value != delimit(value, 1, 65535))
 330                 return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 331                                               " (max publications must be 1-65535)");
 332         tipc_max_publications = value;
 333         return cfg_reply_none();
 334 }
 335
 336 static struct sk_buff *cfg_set_max_subscriptions(void)
 337 {
 338         u32 value;
 339
 340         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 341                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 342
 343         value = *(u32 *)TLV_DATA(req_tlv_area);
 344         value = ntohl(value);
 345         if (value != delimit(value, 1, 65535))
 346                 return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 347                                               " (max subscriptions must be 1-65535");
 348         tipc_max_subscriptions = value;
 349         return cfg_reply_none();
 350 }
 351
 352 static struct sk_buff *cfg_set_max_ports(void)
 353 {
 354         int orig_mode;
 355         u32 value;
 356
 357         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 358                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 359         value = *(u32 *)TLV_DATA(req_tlv_area);
 360         value = ntohl(value);
 361         if (value != delimit(value, 127, 65535))
 362                 return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 363                                               " (max ports must be 127-65535)");
 364
 365         if (value == tipc_max_ports)
 366                 return cfg_reply_none();
 367
 368         if (atomic_read(&tipc_user_count) > 2)
 369                 return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 370                                               " (cannot change max ports while TIPC users exist)");
 371
 372         spin_unlock_bh(&config_lock);
 373         orig_mode = tipc_get_mode();
 374         if (orig_mode == TIPC_NET_MODE)
 375                 stop_net();
 376         stop_core();
 377         tipc_max_ports = value;
 378         start_core();
 379         if (orig_mode == TIPC_NET_MODE)
 380                 start_net();
 381         spin_lock_bh(&config_lock);
 382         return cfg_reply_none();
 383 }
 384
 385 static struct sk_buff *set_net_max(int value, int *parameter)
 386 {
 387         int orig_mode;
 388
 389         if (value != *parameter) {
 390                 orig_mode = tipc_get_mode();
 391                 if (orig_mode == TIPC_NET_MODE)
 392                         stop_net();
 393                 *parameter = value;
 394                 if (orig_mode == TIPC_NET_MODE)
 395                         start_net();
 396         }
 397
 398         return cfg_reply_none();
 399 }
 400
 401 static struct sk_buff *cfg_set_max_zones(void)
 402 {
 403         u32 value;
 404
 405         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 406                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 407         value = *(u32 *)TLV_DATA(req_tlv_area);
 408         value = ntohl(value);
 409         if (value != delimit(value, 1, 255))
 410                 return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 411                                               " (max zones must be 1-255)");
 412         return set_net_max(value, &tipc_max_zones);
 413 }
 414
 415 static struct sk_buff *cfg_set_max_clusters(void)
 416 {
 417         u32 value;
 418
 419         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 420                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 421         value = *(u32 *)TLV_DATA(req_tlv_area);
 422         value = ntohl(value);
 423         if (value != 1)
 424                 return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 425                                               " (max clusters fixed at 1)");
 426         return cfg_reply_none();
 427 }
 428
 429 static struct sk_buff *cfg_set_max_nodes(void)
 430 {
 431         u32 value;
 432
 433         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 434                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 435         value = *(u32 *)TLV_DATA(req_tlv_area);
 436         value = ntohl(value);
 437         if (value != delimit(value, 8, 2047))
 438                 return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 439                                               " (max nodes must be 8-2047)");
 440         return set_net_max(value, &tipc_max_nodes);
 441 }
 442
 443 static struct sk_buff *cfg_set_max_slaves(void)
 444 {
 445         u32 value;
 446
 447         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 448                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 449         value = *(u32 *)TLV_DATA(req_tlv_area);
 450         value = ntohl(value);
 451         if (value != 0)
 452                 return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 453                                               " (max secondary nodes fixed at 0)");
 454         return cfg_reply_none();
 455 }
 456
 457 static struct sk_buff *cfg_set_netid(void)
 458 {
 459         u32 value;
 460
 461         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 462                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 463         value = *(u32 *)TLV_DATA(req_tlv_area);
 464         value = ntohl(value);
 465         if (value != delimit(value, 1, 9999))
 466                 return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 467                                               " (network id must be 1-9999)");
 468
 469         if (tipc_own_addr)
 470                 return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 471                                               " (cannot change network id once part of network)");
 472
 473         return set_net_max(value, &tipc_net_id);
 474 }
 475
 476 struct sk_buff *cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 477                            int request_space, int reply_headroom)
 478 {
 479         struct sk_buff *rep_tlv_buf;
 480
 481         spin_lock_bh(&config_lock);
 482
 483         /* Save request and reply details in a well-known location */
 484
 485         req_tlv_area = request_area;
 486         req_tlv_space = request_space;
 487         rep_headroom = reply_headroom;
 488
 489         /* Check command authorization */
 490
 491         if (likely(orig_node == tipc_own_addr)) {
 492                 /* command is permitted */
 493         } else if (cmd >= 0x8000) {
 494                 rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 495                                                      " (cannot be done remotely)");
 496                 goto exit;
 497         } else if (!tipc_remote_management) {
 498                 rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 499                 goto exit;
 500         }
 501         else if (cmd >= 0x4000) {
 502                 u32 domain = 0;
 503
 504                 if ((nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 505                     (domain != orig_node)) {
 506                         rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 507                         goto exit;
 508                 }
 509         }
 510
 511         /* Call appropriate processing routine */
 512
 513         switch (cmd) {
 514         case TIPC_CMD_NOOP:
 515                 rep_tlv_buf = cfg_reply_none();
 516                 break;
 517         case TIPC_CMD_GET_NODES:
 518                 rep_tlv_buf = node_get_nodes(req_tlv_area, req_tlv_space);
 519                 break;
 520         case TIPC_CMD_GET_LINKS:
 521                 rep_tlv_buf = node_get_links(req_tlv_area, req_tlv_space);
 522                 break;
 523         case TIPC_CMD_SHOW_LINK_STATS:
 524                 rep_tlv_buf = link_cmd_show_stats(req_tlv_area, req_tlv_space);
 525                 break;
 526         case TIPC_CMD_RESET_LINK_STATS:
 527                 rep_tlv_buf = link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 528                 break;
 529         case TIPC_CMD_SHOW_NAME_TABLE:
 530                 rep_tlv_buf = nametbl_get(req_tlv_area, req_tlv_space);
 531                 break;
 532         case TIPC_CMD_GET_BEARER_NAMES:
 533                 rep_tlv_buf = bearer_get_names();
 534                 break;
 535         case TIPC_CMD_GET_MEDIA_NAMES:
 536                 rep_tlv_buf = media_get_names();
 537                 break;
 538         case TIPC_CMD_SHOW_PORTS:
 539                 rep_tlv_buf = port_get_ports();
 540                 break;
 541 #if 0
 542         case TIPC_CMD_SHOW_PORT_STATS:
 543                 rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
 544                 break;
 545         case TIPC_CMD_RESET_PORT_STATS:
 546                 rep_tlv_buf = cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
 547                 break;
 548 #endif
 549         case TIPC_CMD_SET_LOG_SIZE:
 550                 rep_tlv_buf = log_resize(req_tlv_area, req_tlv_space);
 551                 break;
 552         case TIPC_CMD_DUMP_LOG:
 553                 rep_tlv_buf = log_dump();
 554                 break;
 555         case TIPC_CMD_SET_LINK_TOL:
 556         case TIPC_CMD_SET_LINK_PRI:
 557         case TIPC_CMD_SET_LINK_WINDOW:
 558                 rep_tlv_buf = link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 559                 break;
 560         case TIPC_CMD_ENABLE_BEARER:
 561                 rep_tlv_buf = cfg_enable_bearer();
 562                 break;
 563         case TIPC_CMD_DISABLE_BEARER:
 564                 rep_tlv_buf = cfg_disable_bearer();
 565                 break;
 566         case TIPC_CMD_SET_NODE_ADDR:
 567                 rep_tlv_buf = cfg_set_own_addr();
 568                 break;
 569         case TIPC_CMD_SET_REMOTE_MNG:
 570                 rep_tlv_buf = cfg_set_remote_mng();
 571                 break;
 572         case TIPC_CMD_SET_MAX_PORTS:
 573                 rep_tlv_buf = cfg_set_max_ports();
 574                 break;
 575         case TIPC_CMD_SET_MAX_PUBL:
 576                 rep_tlv_buf = cfg_set_max_publications();
 577                 break;
 578         case TIPC_CMD_SET_MAX_SUBSCR:
 579                 rep_tlv_buf = cfg_set_max_subscriptions();
 580                 break;
 581         case TIPC_CMD_SET_MAX_ZONES:
 582                 rep_tlv_buf = cfg_set_max_zones();
 583                 break;
 584         case TIPC_CMD_SET_MAX_CLUSTERS:
 585                 rep_tlv_buf = cfg_set_max_clusters();
 586                 break;
 587         case TIPC_CMD_SET_MAX_NODES:
 588                 rep_tlv_buf = cfg_set_max_nodes();
 589                 break;
 590         case TIPC_CMD_SET_MAX_SLAVES:
 591                 rep_tlv_buf = cfg_set_max_slaves();
 592                 break;
 593         case TIPC_CMD_SET_NETID:
 594                 rep_tlv_buf = cfg_set_netid();
 595                 break;
 596         case TIPC_CMD_GET_REMOTE_MNG:
 597                 rep_tlv_buf = cfg_reply_unsigned(tipc_remote_management);
 598                 break;
 599         case TIPC_CMD_GET_MAX_PORTS:
 600                 rep_tlv_buf = cfg_reply_unsigned(tipc_max_ports);
 601                 break;
 602         case TIPC_CMD_GET_MAX_PUBL:
 603                 rep_tlv_buf = cfg_reply_unsigned(tipc_max_publications);
 604                 break;
 605         case TIPC_CMD_GET_MAX_SUBSCR:
 606                 rep_tlv_buf = cfg_reply_unsigned(tipc_max_subscriptions);
 607                 break;
 608         case TIPC_CMD_GET_MAX_ZONES:
 609                 rep_tlv_buf = cfg_reply_unsigned(tipc_max_zones);
 610                 break;
 611         case TIPC_CMD_GET_MAX_CLUSTERS:
 612                 rep_tlv_buf = cfg_reply_unsigned(tipc_max_clusters);
 613                 break;
 614         case TIPC_CMD_GET_MAX_NODES:
 615                 rep_tlv_buf = cfg_reply_unsigned(tipc_max_nodes);
 616                 break;
 617         case TIPC_CMD_GET_MAX_SLAVES:
 618                 rep_tlv_buf = cfg_reply_unsigned(tipc_max_slaves);
 619                 break;
 620         case TIPC_CMD_GET_NETID:
 621                 rep_tlv_buf = cfg_reply_unsigned(tipc_net_id);
 622                 break;
 623         default:
 624                 rep_tlv_buf = NULL;
 625                 break;
 626         }
 627
 628         /* Return reply buffer */
 629 exit:
 630         spin_unlock_bh(&config_lock);
 631         return rep_tlv_buf;
 632 }
 633
 634 static void cfg_named_msg_event(void *userdata,
 635                                 u32 port_ref,
 636                                 struct sk_buff **buf,
 637                                 const unchar *msg,
 638                                 u32 size,
 639                                 u32 importance,
 640                                 struct tipc_portid const *orig,
 641                                 struct tipc_name_seq const *dest)
 642 {
 643         struct tipc_cfg_msg_hdr *req_hdr;
 644         struct tipc_cfg_msg_hdr *rep_hdr;
 645         struct sk_buff *rep_buf;
 646
 647         /* Validate configuration message header (ignore invalid message) */
 648
 649         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 650         if ((size < sizeof(*req_hdr)) ||
 651             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 652             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 653                 warn("discarded invalid configuration message\n");
 654                 return;
 655         }
 656
 657         /* Generate reply for request (if can't, return request) */
 658
 659         rep_buf = cfg_do_cmd(orig->node,
 660                              ntohs(req_hdr->tcm_type),
 661                              msg + sizeof(*req_hdr),
 662                              size - sizeof(*req_hdr),
 663                              BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 664         if (rep_buf) {
 665                 skb_push(rep_buf, sizeof(*rep_hdr));
 666                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 667                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 668                 rep_hdr->tcm_len = htonl(rep_buf->len);
 669                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 670         } else {
 671                 rep_buf = *buf;
 672                 *buf = NULL;
 673         }
 674
 675         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 676         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 677 }
 678
 679 int cfg_init(void)
 680 {
 681         struct tipc_name_seq seq;
 682         int res;
 683
 684         memset(&mng, 0, sizeof(mng));
 685         INIT_LIST_HEAD(&mng.link_subscribers);
 686
 687         res = tipc_attach(&mng.user_ref, 0, 0);
 688         if (res)
 689                 goto failed;
 690
 691         res = tipc_createport(mng.user_ref, 0, TIPC_CRITICAL_IMPORTANCE,
 692                               NULL, NULL, NULL,
 693                               NULL, cfg_named_msg_event, NULL,
 694                               NULL, &mng.port_ref);
 695         if (res)
 696                 goto failed;
 697
 698         seq.type = TIPC_CFG_SRV;
 699         seq.lower = seq.upper = tipc_own_addr;
 700         res = nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
 701         if (res)
 702                 goto failed;
 703
 704         return 0;
 705
 706 failed:
 707         err("Unable to create configuration service\n");
 708         tipc_detach(mng.user_ref);
 709         mng.user_ref = 0;
 710         return res;
 711 }
 712
 713 void cfg_stop(void)
 714 {
 715         if (mng.user_ref) {
 716                 tipc_detach(mng.user_ref);
 717                 mng.user_ref = 0;
 718         }
 719 }