net/tipc/config.c

   1 /*
   2  * net/tipc/config.c: TIPC configuration management code
   3  *
   4  * Copyright (c) 2002-2006, 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 "dbg.h"
  39 #include "bearer.h"
  40 #include "port.h"
  41 #include "link.h"
  42 #include "zone.h"
  43 #include "addr.h"
  44 #include "name_table.h"
  45 #include "node.h"
  46 #include "config.h"
  47 #include "discover.h"
  48
  49 struct subscr_data {
  50         char usr_handle[8];
  51         u32 domain;
  52         u32 port_ref;
  53         struct list_head subd_list;
  54 };
  55
  56 struct manager {
  57         u32 user_ref;
  58         u32 port_ref;
  59         u32 subscr_ref;
  60         u32 link_subscriptions;
  61         struct list_head link_subscribers;
  62 };
  63
  64 static struct manager mng = { 0};
  65
  66 static DEFINE_SPINLOCK(config_lock);
  67
  68 static const void *req_tlv_area;        /* request message TLV area */
  69 static int req_tlv_space;               /* request message TLV area size */
  70 static int rep_headroom;                /* reply message headroom to use */
  71
  72
  73 void tipc_cfg_link_event(u32 addr, char *name, int up)
  74 {
  75         /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
  76 }
  77
  78
  79 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
  80 {
  81         struct sk_buff *buf;
  82
  83         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
  84         if (buf)
  85                 skb_reserve(buf, rep_headroom);
  86         return buf;
  87 }
  88
  89 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
  90                         void *tlv_data, int tlv_data_size)
  91 {
  92         struct tlv_desc *tlv = (struct tlv_desc *)buf->tail;
  93         int new_tlv_space = TLV_SPACE(tlv_data_size);
  94
  95         if (skb_tailroom(buf) < new_tlv_space) {
  96                 dbg("tipc_cfg_append_tlv unable to append TLV\n");
  97                 return 0;
  98         }
  99         skb_put(buf, new_tlv_space);
 100         tlv->tlv_type = htons(tlv_type);
 101         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
 102         if (tlv_data_size && tlv_data)
 103                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
 104         return 1;
 105 }
 106
 107 struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
 108 {
 109         struct sk_buff *buf;
 110         u32 value_net;
 111
 112         buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
 113         if (buf) {
 114                 value_net = htonl(value);
 115                 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
 116                                     sizeof(value_net));
 117         }
 118         return buf;
 119 }
 120
 121 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
 122 {
 123         struct sk_buff *buf;
 124         int string_len = strlen(string) + 1;
 125
 126         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
 127         if (buf)
 128                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
 129         return buf;
 130 }
 131
 132
 133
 134
 135 #if 0
 136
 137 /* Now obsolete code for handling commands not yet implemented the new way */
 138
 139 int tipc_cfg_cmd(const struct tipc_cmd_msg * msg,
 140                  char *data,
 141                  u32 sz,
 142                  u32 *ret_size,
 143                  struct tipc_portid *orig)
 144 {
 145         int rv = -EINVAL;
 146         u32 cmd = msg->cmd;
 147
 148         *ret_size = 0;
 149         switch (cmd) {
 150         case TIPC_REMOVE_LINK:
 151         case TIPC_CMD_BLOCK_LINK:
 152         case TIPC_CMD_UNBLOCK_LINK:
 153                 if (!cfg_check_connection(orig))
 154                         rv = link_control(msg->argv.link_name, msg->cmd, 0);
 155                 break;
 156         case TIPC_ESTABLISH:
 157                 {
 158                         int connected;
 159
 160                         tipc_isconnected(mng.conn_port_ref, &connected);
 161                         if (connected || !orig) {
 162                                 rv = TIPC_FAILURE;
 163                                 break;
 164                         }
 165                         rv = tipc_connect2port(mng.conn_port_ref, orig);
 166                         if (rv == TIPC_OK)
 167                                 orig = 0;
 168                         break;
 169                 }
 170         case TIPC_GET_PEER_ADDRESS:
 171                 *ret_size = link_peer_addr(msg->argv.link_name, data, sz);
 172                 break;
 173         case TIPC_GET_ROUTES:
 174                 rv = TIPC_OK;
 175                 break;
 176         default: {}
 177         }
 178         if (*ret_size)
 179                 rv = TIPC_OK;
 180         return rv;
 181 }
 182
 183 static void cfg_cmd_event(struct tipc_cmd_msg *msg,
 184                           char *data,
 185                           u32 sz,
 186                           struct tipc_portid const *orig)
 187 {
 188         int rv = -EINVAL;
 189         struct tipc_cmd_result_msg rmsg;
 190         struct iovec msg_sect[2];
 191         int *arg;
 192
 193         msg->cmd = ntohl(msg->cmd);
 194
 195         cfg_prepare_res_msg(msg->cmd, msg->usr_handle, rv, &rmsg, msg_sect,
 196                             data, 0);
 197         if (ntohl(msg->magic) != TIPC_MAGIC)
 198                 goto exit;
 199
 200         switch (msg->cmd) {
 201         case TIPC_CREATE_LINK:
 202                 if (!cfg_check_connection(orig))
 203                         rv = disc_create_link(&msg->argv.create_link);
 204                 break;
 205         case TIPC_LINK_SUBSCRIBE:
 206                 {
 207                         struct subscr_data *sub;
 208
 209                         if (mng.link_subscriptions > 64)
 210                                 break;
 211                         sub = (struct subscr_data *)kmalloc(sizeof(*sub),
 212                                                             GFP_ATOMIC);
 213                         if (sub == NULL) {
 214                                 warn("Memory squeeze; dropped remote link subscription\n");
 215                                 break;
 216                         }
 217                         INIT_LIST_HEAD(&sub->subd_list);
 218                         tipc_createport(mng.user_ref,
 219                                         (void *)sub,
 220                                         TIPC_HIGH_IMPORTANCE,
 221                                         0,
 222                                         0,
 223                                         (tipc_conn_shutdown_event)cfg_linksubscr_cancel,
 224                                         0,
 225                                         0,
 226                                         (tipc_conn_msg_event)cfg_linksubscr_cancel,
 227                                         0,
 228                                         &sub->port_ref);
 229                         if (!sub->port_ref) {
 230                                 kfree(sub);
 231                                 break;
 232                         }
 233                         memcpy(sub->usr_handle,msg->usr_handle,
 234                                sizeof(sub->usr_handle));
 235                         sub->domain = msg->argv.domain;
 236                         list_add_tail(&sub->subd_list, &mng.link_subscribers);
 237                         tipc_connect2port(sub->port_ref, orig);
 238                         rmsg.retval = TIPC_OK;
 239                         tipc_send(sub->port_ref, 2u, msg_sect);
 240                         mng.link_subscriptions++;
 241                         return;
 242                 }
 243         default:
 244                 rv = tipc_cfg_cmd(msg, data, sz, (u32 *)&msg_sect[1].iov_len, orig);
 245         }
 246         exit:
 247         rmsg.result_len = htonl(msg_sect[1].iov_len);
 248         rmsg.retval = htonl(rv);
 249         tipc_cfg_respond(msg_sect, 2u, orig);
 250 }
 251 #endif
 252
 253 static struct sk_buff *cfg_enable_bearer(void)
 254 {
 255         struct tipc_bearer_config *args;
 256
 257         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 258                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 259
 260         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 261         if (tipc_enable_bearer(args->name,
 262                                ntohl(args->detect_scope),
 263                                ntohl(args->priority)))
 264                 return tipc_cfg_reply_error_string("unable to enable bearer");
 265
 266         return tipc_cfg_reply_none();
 267 }
 268
 269 static struct sk_buff *cfg_disable_bearer(void)
 270 {
 271         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 272                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 273
 274         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 275                 return tipc_cfg_reply_error_string("unable to disable bearer");
 276
 277         return tipc_cfg_reply_none();
 278 }
 279
 280 static struct sk_buff *cfg_set_own_addr(void)
 281 {
 282         u32 addr;
 283
 284         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 285                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 286
 287         addr = *(u32 *)TLV_DATA(req_tlv_area);
 288         addr = ntohl(addr);
 289         if (addr == tipc_own_addr)
 290                 return tipc_cfg_reply_none();
 291         if (!tipc_addr_node_valid(addr))
 292                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 293                                                    " (node address)");
 294         if (tipc_mode == TIPC_NET_MODE)
 295                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 296                                                    " (cannot change node address once assigned)");
 297         tipc_own_addr = addr;
 298
 299         /*
 300          * Must release all spinlocks before calling start_net() because
 301          * Linux version of TIPC calls eth_media_start() which calls
 302          * register_netdevice_notifier() which may block!
 303          *
 304          * Temporarily releasing the lock should be harmless for non-Linux TIPC,
 305          * but Linux version of eth_media_start() should really be reworked
 306          * so that it can be called with spinlocks held.
 307          */
 308
 309         spin_unlock_bh(&config_lock);
 310         tipc_core_start_net();
 311         spin_lock_bh(&config_lock);
 312         return tipc_cfg_reply_none();
 313 }
 314
 315 static struct sk_buff *cfg_set_remote_mng(void)
 316 {
 317         u32 value;
 318
 319         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 320                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 321
 322         value = *(u32 *)TLV_DATA(req_tlv_area);
 323         value = ntohl(value);
 324         tipc_remote_management = (value != 0);
 325         return tipc_cfg_reply_none();
 326 }
 327
 328 static struct sk_buff *cfg_set_max_publications(void)
 329 {
 330         u32 value;
 331
 332         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 333                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 334
 335         value = *(u32 *)TLV_DATA(req_tlv_area);
 336         value = ntohl(value);
 337         if (value != delimit(value, 1, 65535))
 338                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 339                                                    " (max publications must be 1-65535)");
 340         tipc_max_publications = value;
 341         return tipc_cfg_reply_none();
 342 }
 343
 344 static struct sk_buff *cfg_set_max_subscriptions(void)
 345 {
 346         u32 value;
 347
 348         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 349                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 350
 351         value = *(u32 *)TLV_DATA(req_tlv_area);
 352         value = ntohl(value);
 353         if (value != delimit(value, 1, 65535))
 354                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 355                                                    " (max subscriptions must be 1-65535");
 356         tipc_max_subscriptions = value;
 357         return tipc_cfg_reply_none();
 358 }
 359
 360 static struct sk_buff *cfg_set_max_ports(void)
 361 {
 362         u32 value;
 363
 364         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 365                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 366         value = *(u32 *)TLV_DATA(req_tlv_area);
 367         value = ntohl(value);
 368         if (value == tipc_max_ports)
 369                 return tipc_cfg_reply_none();
 370         if (value != delimit(value, 127, 65535))
 371                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 372                                                    " (max ports must be 127-65535)");
 373         if (tipc_mode != TIPC_NOT_RUNNING)
 374                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 375                         " (cannot change max ports while TIPC is active)");
 376         tipc_max_ports = value;
 377         return tipc_cfg_reply_none();
 378 }
 379
 380 static struct sk_buff *cfg_set_max_zones(void)
 381 {
 382         u32 value;
 383
 384         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 385                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 386         value = *(u32 *)TLV_DATA(req_tlv_area);
 387         value = ntohl(value);
 388         if (value == tipc_max_zones)
 389                 return tipc_cfg_reply_none();
 390         if (value != delimit(value, 1, 255))
 391                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 392                                                    " (max zones must be 1-255)");
 393         if (tipc_mode == TIPC_NET_MODE)
 394                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 395                         " (cannot change max zones once TIPC has joined a network)");
 396         tipc_max_zones = value;
 397         return tipc_cfg_reply_none();
 398 }
 399
 400 static struct sk_buff *cfg_set_max_clusters(void)
 401 {
 402         u32 value;
 403
 404         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 405                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 406         value = *(u32 *)TLV_DATA(req_tlv_area);
 407         value = ntohl(value);
 408         if (value != delimit(value, 1, 1))
 409                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 410                                                    " (max clusters fixed at 1)");
 411         return tipc_cfg_reply_none();
 412 }
 413
 414 static struct sk_buff *cfg_set_max_nodes(void)
 415 {
 416         u32 value;
 417
 418         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 419                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 420         value = *(u32 *)TLV_DATA(req_tlv_area);
 421         value = ntohl(value);
 422         if (value == tipc_max_nodes)
 423                 return tipc_cfg_reply_none();
 424         if (value != delimit(value, 8, 2047))
 425                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 426                                                    " (max nodes must be 8-2047)");
 427         if (tipc_mode == TIPC_NET_MODE)
 428                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 429                         " (cannot change max nodes once TIPC has joined a network)");
 430         tipc_max_nodes = value;
 431         return tipc_cfg_reply_none();
 432 }
 433
 434 static struct sk_buff *cfg_set_max_slaves(void)
 435 {
 436         u32 value;
 437
 438         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 439                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 440         value = *(u32 *)TLV_DATA(req_tlv_area);
 441         value = ntohl(value);
 442         if (value != 0)
 443                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 444                                                    " (max secondary nodes fixed at 0)");
 445         return tipc_cfg_reply_none();
 446 }
 447
 448 static struct sk_buff *cfg_set_netid(void)
 449 {
 450         u32 value;
 451
 452         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 453                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 454         value = *(u32 *)TLV_DATA(req_tlv_area);
 455         value = ntohl(value);
 456         if (value == tipc_net_id)
 457                 return tipc_cfg_reply_none();
 458         if (value != delimit(value, 1, 9999))
 459                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 460                                                    " (network id must be 1-9999)");
 461         if (tipc_mode == TIPC_NET_MODE)
 462                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 463                         " (cannot change network id once TIPC has joined a network)");
 464         tipc_net_id = value;
 465         return tipc_cfg_reply_none();
 466 }
 467
 468 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 469                                 int request_space, int reply_headroom)
 470 {
 471         struct sk_buff *rep_tlv_buf;
 472
 473         spin_lock_bh(&config_lock);
 474
 475         /* Save request and reply details in a well-known location */
 476
 477         req_tlv_area = request_area;
 478         req_tlv_space = request_space;
 479         rep_headroom = reply_headroom;
 480
 481         /* Check command authorization */
 482
 483         if (likely(orig_node == tipc_own_addr)) {
 484                 /* command is permitted */
 485         } else if (cmd >= 0x8000) {
 486                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 487                                                           " (cannot be done remotely)");
 488                 goto exit;
 489         } else if (!tipc_remote_management) {
 490                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 491                 goto exit;
 492         }
 493         else if (cmd >= 0x4000) {
 494                 u32 domain = 0;
 495
 496                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 497                     (domain != orig_node)) {
 498                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 499                         goto exit;
 500                 }
 501         }
 502
 503         /* Call appropriate processing routine */
 504
 505         switch (cmd) {
 506         case TIPC_CMD_NOOP:
 507                 rep_tlv_buf = tipc_cfg_reply_none();
 508                 break;
 509         case TIPC_CMD_GET_NODES:
 510                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 511                 break;
 512         case TIPC_CMD_GET_LINKS:
 513                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 514                 break;
 515         case TIPC_CMD_SHOW_LINK_STATS:
 516                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 517                 break;
 518         case TIPC_CMD_RESET_LINK_STATS:
 519                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 520                 break;
 521         case TIPC_CMD_SHOW_NAME_TABLE:
 522                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 523                 break;
 524         case TIPC_CMD_GET_BEARER_NAMES:
 525                 rep_tlv_buf = tipc_bearer_get_names();
 526                 break;
 527         case TIPC_CMD_GET_MEDIA_NAMES:
 528                 rep_tlv_buf = tipc_media_get_names();
 529                 break;
 530         case TIPC_CMD_SHOW_PORTS:
 531                 rep_tlv_buf = tipc_port_get_ports();
 532                 break;
 533 #if 0
 534         case TIPC_CMD_SHOW_PORT_STATS:
 535                 rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
 536                 break;
 537         case TIPC_CMD_RESET_PORT_STATS:
 538                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
 539                 break;
 540 #endif
 541         case TIPC_CMD_SET_LOG_SIZE:
 542                 rep_tlv_buf = tipc_log_resize(req_tlv_area, req_tlv_space);
 543                 break;
 544         case TIPC_CMD_DUMP_LOG:
 545                 rep_tlv_buf = tipc_log_dump();
 546                 break;
 547         case TIPC_CMD_SET_LINK_TOL:
 548         case TIPC_CMD_SET_LINK_PRI:
 549         case TIPC_CMD_SET_LINK_WINDOW:
 550                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 551                 break;
 552         case TIPC_CMD_ENABLE_BEARER:
 553                 rep_tlv_buf = cfg_enable_bearer();
 554                 break;
 555         case TIPC_CMD_DISABLE_BEARER:
 556                 rep_tlv_buf = cfg_disable_bearer();
 557                 break;
 558         case TIPC_CMD_SET_NODE_ADDR:
 559                 rep_tlv_buf = cfg_set_own_addr();
 560                 break;
 561         case TIPC_CMD_SET_REMOTE_MNG:
 562                 rep_tlv_buf = cfg_set_remote_mng();
 563                 break;
 564         case TIPC_CMD_SET_MAX_PORTS:
 565                 rep_tlv_buf = cfg_set_max_ports();
 566                 break;
 567         case TIPC_CMD_SET_MAX_PUBL:
 568                 rep_tlv_buf = cfg_set_max_publications();
 569                 break;
 570         case TIPC_CMD_SET_MAX_SUBSCR:
 571                 rep_tlv_buf = cfg_set_max_subscriptions();
 572                 break;
 573         case TIPC_CMD_SET_MAX_ZONES:
 574                 rep_tlv_buf = cfg_set_max_zones();
 575                 break;
 576         case TIPC_CMD_SET_MAX_CLUSTERS:
 577                 rep_tlv_buf = cfg_set_max_clusters();
 578                 break;
 579         case TIPC_CMD_SET_MAX_NODES:
 580                 rep_tlv_buf = cfg_set_max_nodes();
 581                 break;
 582         case TIPC_CMD_SET_MAX_SLAVES:
 583                 rep_tlv_buf = cfg_set_max_slaves();
 584                 break;
 585         case TIPC_CMD_SET_NETID:
 586                 rep_tlv_buf = cfg_set_netid();
 587                 break;
 588         case TIPC_CMD_GET_REMOTE_MNG:
 589                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 590                 break;
 591         case TIPC_CMD_GET_MAX_PORTS:
 592                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 593                 break;
 594         case TIPC_CMD_GET_MAX_PUBL:
 595                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 596                 break;
 597         case TIPC_CMD_GET_MAX_SUBSCR:
 598                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 599                 break;
 600         case TIPC_CMD_GET_MAX_ZONES:
 601                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
 602                 break;
 603         case TIPC_CMD_GET_MAX_CLUSTERS:
 604                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
 605                 break;
 606         case TIPC_CMD_GET_MAX_NODES:
 607                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
 608                 break;
 609         case TIPC_CMD_GET_MAX_SLAVES:
 610                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
 611                 break;
 612         case TIPC_CMD_GET_NETID:
 613                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 614                 break;
 615         default:
 616                 rep_tlv_buf = NULL;
 617                 break;
 618         }
 619
 620         /* Return reply buffer */
 621 exit:
 622         spin_unlock_bh(&config_lock);
 623         return rep_tlv_buf;
 624 }
 625
 626 static void cfg_named_msg_event(void *userdata,
 627                                 u32 port_ref,
 628                                 struct sk_buff **buf,
 629                                 const unchar *msg,
 630                                 u32 size,
 631                                 u32 importance,
 632                                 struct tipc_portid const *orig,
 633                                 struct tipc_name_seq const *dest)
 634 {
 635         struct tipc_cfg_msg_hdr *req_hdr;
 636         struct tipc_cfg_msg_hdr *rep_hdr;
 637         struct sk_buff *rep_buf;
 638
 639         /* Validate configuration message header (ignore invalid message) */
 640
 641         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 642         if ((size < sizeof(*req_hdr)) ||
 643             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 644             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 645                 warn("Invalid configuration message discarded\n");
 646                 return;
 647         }
 648
 649         /* Generate reply for request (if can't, return request) */
 650
 651         rep_buf = tipc_cfg_do_cmd(orig->node,
 652                                   ntohs(req_hdr->tcm_type),
 653                                   msg + sizeof(*req_hdr),
 654                                   size - sizeof(*req_hdr),
 655                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 656         if (rep_buf) {
 657                 skb_push(rep_buf, sizeof(*rep_hdr));
 658                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 659                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 660                 rep_hdr->tcm_len = htonl(rep_buf->len);
 661                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 662         } else {
 663                 rep_buf = *buf;
 664                 *buf = NULL;
 665         }
 666
 667         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 668         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 669 }
 670
 671 int tipc_cfg_init(void)
 672 {
 673         struct tipc_name_seq seq;
 674         int res;
 675
 676         memset(&mng, 0, sizeof(mng));
 677         INIT_LIST_HEAD(&mng.link_subscribers);
 678
 679         res = tipc_attach(&mng.user_ref, NULL, NULL);
 680         if (res)
 681                 goto failed;
 682
 683         res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
 684                               NULL, NULL, NULL,
 685                               NULL, cfg_named_msg_event, NULL,
 686                               NULL, &mng.port_ref);
 687         if (res)
 688                 goto failed;
 689
 690         seq.type = TIPC_CFG_SRV;
 691         seq.lower = seq.upper = tipc_own_addr;
 692         res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
 693         if (res)
 694                 goto failed;
 695
 696         return 0;
 697
 698 failed:
 699         err("Unable to create configuration service\n");
 700         tipc_detach(mng.user_ref);
 701         mng.user_ref = 0;
 702         return res;
 703 }
 704
 705 void tipc_cfg_stop(void)
 706 {
 707         if (mng.user_ref) {
 708                 tipc_detach(mng.user_ref);
 709                 mng.user_ref = 0;
 710         }
 711 }