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) 2004-2006, 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 *)skb_tail_pointer(buf);
  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         __be32 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 = 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 = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 288         if (addr == tipc_own_addr)
 289                 return tipc_cfg_reply_none();
 290         if (!tipc_addr_node_valid(addr))
 291                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 292                                                    " (node address)");
 293         if (tipc_mode == TIPC_NET_MODE)
 294                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 295                                                    " (cannot change node address once assigned)");
 296         tipc_own_addr = addr;
 297
 298         /*
 299          * Must release all spinlocks before calling start_net() because
 300          * Linux version of TIPC calls eth_media_start() which calls
 301          * register_netdevice_notifier() which may block!
 302          *
 303          * Temporarily releasing the lock should be harmless for non-Linux TIPC,
 304          * but Linux version of eth_media_start() should really be reworked
 305          * so that it can be called with spinlocks held.
 306          */
 307
 308         spin_unlock_bh(&config_lock);
 309         tipc_core_start_net();
 310         spin_lock_bh(&config_lock);
 311         return tipc_cfg_reply_none();
 312 }
 313
 314 static struct sk_buff *cfg_set_remote_mng(void)
 315 {
 316         u32 value;
 317
 318         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 319                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 320
 321         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 322         tipc_remote_management = (value != 0);
 323         return tipc_cfg_reply_none();
 324 }
 325
 326 static struct sk_buff *cfg_set_max_publications(void)
 327 {
 328         u32 value;
 329
 330         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 331                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 332
 333         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 334         if (value != delimit(value, 1, 65535))
 335                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 336                                                    " (max publications must be 1-65535)");
 337         tipc_max_publications = value;
 338         return tipc_cfg_reply_none();
 339 }
 340
 341 static struct sk_buff *cfg_set_max_subscriptions(void)
 342 {
 343         u32 value;
 344
 345         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 346                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 347
 348         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 349         if (value != delimit(value, 1, 65535))
 350                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 351                                                    " (max subscriptions must be 1-65535");
 352         tipc_max_subscriptions = value;
 353         return tipc_cfg_reply_none();
 354 }
 355
 356 static struct sk_buff *cfg_set_max_ports(void)
 357 {
 358         u32 value;
 359
 360         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 361                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 362         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 363         if (value == tipc_max_ports)
 364                 return tipc_cfg_reply_none();
 365         if (value != delimit(value, 127, 65535))
 366                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 367                                                    " (max ports must be 127-65535)");
 368         if (tipc_mode != TIPC_NOT_RUNNING)
 369                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 370                         " (cannot change max ports while TIPC is active)");
 371         tipc_max_ports = value;
 372         return tipc_cfg_reply_none();
 373 }
 374
 375 static struct sk_buff *cfg_set_max_zones(void)
 376 {
 377         u32 value;
 378
 379         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 380                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 381         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 382         if (value == tipc_max_zones)
 383                 return tipc_cfg_reply_none();
 384         if (value != delimit(value, 1, 255))
 385                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 386                                                    " (max zones must be 1-255)");
 387         if (tipc_mode == TIPC_NET_MODE)
 388                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 389                         " (cannot change max zones once TIPC has joined a network)");
 390         tipc_max_zones = value;
 391         return tipc_cfg_reply_none();
 392 }
 393
 394 static struct sk_buff *cfg_set_max_clusters(void)
 395 {
 396         u32 value;
 397
 398         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 399                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 400         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 401         if (value != delimit(value, 1, 1))
 402                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 403                                                    " (max clusters fixed at 1)");
 404         return tipc_cfg_reply_none();
 405 }
 406
 407 static struct sk_buff *cfg_set_max_nodes(void)
 408 {
 409         u32 value;
 410
 411         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 412                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 413         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 414         if (value == tipc_max_nodes)
 415                 return tipc_cfg_reply_none();
 416         if (value != delimit(value, 8, 2047))
 417                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 418                                                    " (max nodes must be 8-2047)");
 419         if (tipc_mode == TIPC_NET_MODE)
 420                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 421                         " (cannot change max nodes once TIPC has joined a network)");
 422         tipc_max_nodes = value;
 423         return tipc_cfg_reply_none();
 424 }
 425
 426 static struct sk_buff *cfg_set_max_slaves(void)
 427 {
 428         u32 value;
 429
 430         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 431                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 432         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 433         if (value != 0)
 434                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 435                                                    " (max secondary nodes fixed at 0)");
 436         return tipc_cfg_reply_none();
 437 }
 438
 439 static struct sk_buff *cfg_set_netid(void)
 440 {
 441         u32 value;
 442
 443         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 444                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 445         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 446         if (value == tipc_net_id)
 447                 return tipc_cfg_reply_none();
 448         if (value != delimit(value, 1, 9999))
 449                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 450                                                    " (network id must be 1-9999)");
 451         if (tipc_mode == TIPC_NET_MODE)
 452                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 453                         " (cannot change network id once TIPC has joined a network)");
 454         tipc_net_id = value;
 455         return tipc_cfg_reply_none();
 456 }
 457
 458 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 459                                 int request_space, int reply_headroom)
 460 {
 461         struct sk_buff *rep_tlv_buf;
 462
 463         spin_lock_bh(&config_lock);
 464
 465         /* Save request and reply details in a well-known location */
 466
 467         req_tlv_area = request_area;
 468         req_tlv_space = request_space;
 469         rep_headroom = reply_headroom;
 470
 471         /* Check command authorization */
 472
 473         if (likely(orig_node == tipc_own_addr)) {
 474                 /* command is permitted */
 475         } else if (cmd >= 0x8000) {
 476                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 477                                                           " (cannot be done remotely)");
 478                 goto exit;
 479         } else if (!tipc_remote_management) {
 480                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 481                 goto exit;
 482         }
 483         else if (cmd >= 0x4000) {
 484                 u32 domain = 0;
 485
 486                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 487                     (domain != orig_node)) {
 488                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 489                         goto exit;
 490                 }
 491         }
 492
 493         /* Call appropriate processing routine */
 494
 495         switch (cmd) {
 496         case TIPC_CMD_NOOP:
 497                 rep_tlv_buf = tipc_cfg_reply_none();
 498                 break;
 499         case TIPC_CMD_GET_NODES:
 500                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 501                 break;
 502         case TIPC_CMD_GET_LINKS:
 503                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 504                 break;
 505         case TIPC_CMD_SHOW_LINK_STATS:
 506                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 507                 break;
 508         case TIPC_CMD_RESET_LINK_STATS:
 509                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 510                 break;
 511         case TIPC_CMD_SHOW_NAME_TABLE:
 512                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 513                 break;
 514         case TIPC_CMD_GET_BEARER_NAMES:
 515                 rep_tlv_buf = tipc_bearer_get_names();
 516                 break;
 517         case TIPC_CMD_GET_MEDIA_NAMES:
 518                 rep_tlv_buf = tipc_media_get_names();
 519                 break;
 520         case TIPC_CMD_SHOW_PORTS:
 521                 rep_tlv_buf = tipc_port_get_ports();
 522                 break;
 523 #if 0
 524         case TIPC_CMD_SHOW_PORT_STATS:
 525                 rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
 526                 break;
 527         case TIPC_CMD_RESET_PORT_STATS:
 528                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
 529                 break;
 530 #endif
 531         case TIPC_CMD_SET_LOG_SIZE:
 532                 rep_tlv_buf = tipc_log_resize(req_tlv_area, req_tlv_space);
 533                 break;
 534         case TIPC_CMD_DUMP_LOG:
 535                 rep_tlv_buf = tipc_log_dump();
 536                 break;
 537         case TIPC_CMD_SET_LINK_TOL:
 538         case TIPC_CMD_SET_LINK_PRI:
 539         case TIPC_CMD_SET_LINK_WINDOW:
 540                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 541                 break;
 542         case TIPC_CMD_ENABLE_BEARER:
 543                 rep_tlv_buf = cfg_enable_bearer();
 544                 break;
 545         case TIPC_CMD_DISABLE_BEARER:
 546                 rep_tlv_buf = cfg_disable_bearer();
 547                 break;
 548         case TIPC_CMD_SET_NODE_ADDR:
 549                 rep_tlv_buf = cfg_set_own_addr();
 550                 break;
 551         case TIPC_CMD_SET_REMOTE_MNG:
 552                 rep_tlv_buf = cfg_set_remote_mng();
 553                 break;
 554         case TIPC_CMD_SET_MAX_PORTS:
 555                 rep_tlv_buf = cfg_set_max_ports();
 556                 break;
 557         case TIPC_CMD_SET_MAX_PUBL:
 558                 rep_tlv_buf = cfg_set_max_publications();
 559                 break;
 560         case TIPC_CMD_SET_MAX_SUBSCR:
 561                 rep_tlv_buf = cfg_set_max_subscriptions();
 562                 break;
 563         case TIPC_CMD_SET_MAX_ZONES:
 564                 rep_tlv_buf = cfg_set_max_zones();
 565                 break;
 566         case TIPC_CMD_SET_MAX_CLUSTERS:
 567                 rep_tlv_buf = cfg_set_max_clusters();
 568                 break;
 569         case TIPC_CMD_SET_MAX_NODES:
 570                 rep_tlv_buf = cfg_set_max_nodes();
 571                 break;
 572         case TIPC_CMD_SET_MAX_SLAVES:
 573                 rep_tlv_buf = cfg_set_max_slaves();
 574                 break;
 575         case TIPC_CMD_SET_NETID:
 576                 rep_tlv_buf = cfg_set_netid();
 577                 break;
 578         case TIPC_CMD_GET_REMOTE_MNG:
 579                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 580                 break;
 581         case TIPC_CMD_GET_MAX_PORTS:
 582                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 583                 break;
 584         case TIPC_CMD_GET_MAX_PUBL:
 585                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 586                 break;
 587         case TIPC_CMD_GET_MAX_SUBSCR:
 588                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 589                 break;
 590         case TIPC_CMD_GET_MAX_ZONES:
 591                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
 592                 break;
 593         case TIPC_CMD_GET_MAX_CLUSTERS:
 594                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
 595                 break;
 596         case TIPC_CMD_GET_MAX_NODES:
 597                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
 598                 break;
 599         case TIPC_CMD_GET_MAX_SLAVES:
 600                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
 601                 break;
 602         case TIPC_CMD_GET_NETID:
 603                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 604                 break;
 605         default:
 606                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 607                                                           " (unknown command)");
 608                 break;
 609         }
 610
 611         /* Return reply buffer */
 612 exit:
 613         spin_unlock_bh(&config_lock);
 614         return rep_tlv_buf;
 615 }
 616
 617 static void cfg_named_msg_event(void *userdata,
 618                                 u32 port_ref,
 619                                 struct sk_buff **buf,
 620                                 const unchar *msg,
 621                                 u32 size,
 622                                 u32 importance,
 623                                 struct tipc_portid const *orig,
 624                                 struct tipc_name_seq const *dest)
 625 {
 626         struct tipc_cfg_msg_hdr *req_hdr;
 627         struct tipc_cfg_msg_hdr *rep_hdr;
 628         struct sk_buff *rep_buf;
 629
 630         /* Validate configuration message header (ignore invalid message) */
 631
 632         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 633         if ((size < sizeof(*req_hdr)) ||
 634             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 635             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 636                 warn("Invalid configuration message discarded\n");
 637                 return;
 638         }
 639
 640         /* Generate reply for request (if can't, return request) */
 641
 642         rep_buf = tipc_cfg_do_cmd(orig->node,
 643                                   ntohs(req_hdr->tcm_type),
 644                                   msg + sizeof(*req_hdr),
 645                                   size - sizeof(*req_hdr),
 646                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 647         if (rep_buf) {
 648                 skb_push(rep_buf, sizeof(*rep_hdr));
 649                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 650                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 651                 rep_hdr->tcm_len = htonl(rep_buf->len);
 652                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 653         } else {
 654                 rep_buf = *buf;
 655                 *buf = NULL;
 656         }
 657
 658         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 659         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 660 }
 661
 662 int tipc_cfg_init(void)
 663 {
 664         struct tipc_name_seq seq;
 665         int res;
 666
 667         memset(&mng, 0, sizeof(mng));
 668         INIT_LIST_HEAD(&mng.link_subscribers);
 669
 670         res = tipc_attach(&mng.user_ref, NULL, NULL);
 671         if (res)
 672                 goto failed;
 673
 674         res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
 675                               NULL, NULL, NULL,
 676                               NULL, cfg_named_msg_event, NULL,
 677                               NULL, &mng.port_ref);
 678         if (res)
 679                 goto failed;
 680
 681         seq.type = TIPC_CFG_SRV;
 682         seq.lower = seq.upper = tipc_own_addr;
 683         res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
 684         if (res)
 685                 goto failed;
 686
 687         return 0;
 688
 689 failed:
 690         err("Unable to create configuration service\n");
 691         tipc_detach(mng.user_ref);
 692         mng.user_ref = 0;
 693         return res;
 694 }
 695
 696 void tipc_cfg_stop(void)
 697 {
 698         if (mng.user_ref) {
 699                 tipc_detach(mng.user_ref);
 700                 mng.user_ref = 0;
 701         }
 702 }