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) 2004-2007, 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 };
  60
  61 static struct manager mng = { 0};
  62
  63 static DEFINE_SPINLOCK(config_lock);
  64
  65 static const void *req_tlv_area;        /* request message TLV area */
  66 static int req_tlv_space;               /* request message TLV area size */
  67 static int rep_headroom;                /* reply message headroom to use */
  68
  69
  70 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
  71 {
  72         struct sk_buff *buf;
  73
  74         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
  75         if (buf)
  76                 skb_reserve(buf, rep_headroom);
  77         return buf;
  78 }
  79
  80 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
  81                         void *tlv_data, int tlv_data_size)
  82 {
  83         struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
  84         int new_tlv_space = TLV_SPACE(tlv_data_size);
  85
  86         if (skb_tailroom(buf) < new_tlv_space) {
  87                 dbg("tipc_cfg_append_tlv unable to append TLV\n");
  88                 return 0;
  89         }
  90         skb_put(buf, new_tlv_space);
  91         tlv->tlv_type = htons(tlv_type);
  92         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
  93         if (tlv_data_size && tlv_data)
  94                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
  95         return 1;
  96 }
  97
  98 struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
  99 {
 100         struct sk_buff *buf;
 101         __be32 value_net;
 102
 103         buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
 104         if (buf) {
 105                 value_net = htonl(value);
 106                 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
 107                                     sizeof(value_net));
 108         }
 109         return buf;
 110 }
 111
 112 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
 113 {
 114         struct sk_buff *buf;
 115         int string_len = strlen(string) + 1;
 116
 117         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
 118         if (buf)
 119                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
 120         return buf;
 121 }
 122
 123
 124 #if 0
 125
 126 /* Now obsolete code for handling commands not yet implemented the new way */
 127
 128 /*
 129  * Some of this code assumed that the manager structure contains two added
 130  * fields:
 131  *      u32 link_subscriptions;
 132  *      struct list_head link_subscribers;
 133  * which are currently not present.  These fields may need to be re-introduced
 134  * if and when support for link subscriptions is added.
 135  */
 136
 137 void tipc_cfg_link_event(u32 addr, char *name, int up)
 138 {
 139         /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
 140 }
 141
 142 int tipc_cfg_cmd(const struct tipc_cmd_msg * msg,
 143                  char *data,
 144                  u32 sz,
 145                  u32 *ret_size,
 146                  struct tipc_portid *orig)
 147 {
 148         int rv = -EINVAL;
 149         u32 cmd = msg->cmd;
 150
 151         *ret_size = 0;
 152         switch (cmd) {
 153         case TIPC_REMOVE_LINK:
 154         case TIPC_CMD_BLOCK_LINK:
 155         case TIPC_CMD_UNBLOCK_LINK:
 156                 if (!cfg_check_connection(orig))
 157                         rv = link_control(msg->argv.link_name, msg->cmd, 0);
 158                 break;
 159         case TIPC_ESTABLISH:
 160                 {
 161                         int connected;
 162
 163                         tipc_isconnected(mng.conn_port_ref, &connected);
 164                         if (connected || !orig) {
 165                                 rv = TIPC_FAILURE;
 166                                 break;
 167                         }
 168                         rv = tipc_connect2port(mng.conn_port_ref, orig);
 169                         if (rv == TIPC_OK)
 170                                 orig = 0;
 171                         break;
 172                 }
 173         case TIPC_GET_PEER_ADDRESS:
 174                 *ret_size = link_peer_addr(msg->argv.link_name, data, sz);
 175                 break;
 176         case TIPC_GET_ROUTES:
 177                 rv = TIPC_OK;
 178                 break;
 179         default: {}
 180         }
 181         if (*ret_size)
 182                 rv = TIPC_OK;
 183         return rv;
 184 }
 185
 186 static void cfg_cmd_event(struct tipc_cmd_msg *msg,
 187                           char *data,
 188                           u32 sz,
 189                           struct tipc_portid const *orig)
 190 {
 191         int rv = -EINVAL;
 192         struct tipc_cmd_result_msg rmsg;
 193         struct iovec msg_sect[2];
 194         int *arg;
 195
 196         msg->cmd = ntohl(msg->cmd);
 197
 198         cfg_prepare_res_msg(msg->cmd, msg->usr_handle, rv, &rmsg, msg_sect,
 199                             data, 0);
 200         if (ntohl(msg->magic) != TIPC_MAGIC)
 201                 goto exit;
 202
 203         switch (msg->cmd) {
 204         case TIPC_CREATE_LINK:
 205                 if (!cfg_check_connection(orig))
 206                         rv = disc_create_link(&msg->argv.create_link);
 207                 break;
 208         case TIPC_LINK_SUBSCRIBE:
 209                 {
 210                         struct subscr_data *sub;
 211
 212                         if (mng.link_subscriptions > 64)
 213                                 break;
 214                         sub = kmalloc(sizeof(*sub),
 215                                                             GFP_ATOMIC);
 216                         if (sub == NULL) {
 217                                 warn("Memory squeeze; dropped remote link subscription\n");
 218                                 break;
 219                         }
 220                         INIT_LIST_HEAD(&sub->subd_list);
 221                         tipc_createport(mng.user_ref,
 222                                         (void *)sub,
 223                                         TIPC_HIGH_IMPORTANCE,
 224                                         0,
 225                                         0,
 226                                         (tipc_conn_shutdown_event)cfg_linksubscr_cancel,
 227                                         0,
 228                                         0,
 229                                         (tipc_conn_msg_event)cfg_linksubscr_cancel,
 230                                         0,
 231                                         &sub->port_ref);
 232                         if (!sub->port_ref) {
 233                                 kfree(sub);
 234                                 break;
 235                         }
 236                         memcpy(sub->usr_handle,msg->usr_handle,
 237                                sizeof(sub->usr_handle));
 238                         sub->domain = msg->argv.domain;
 239                         list_add_tail(&sub->subd_list, &mng.link_subscribers);
 240                         tipc_connect2port(sub->port_ref, orig);
 241                         rmsg.retval = TIPC_OK;
 242                         tipc_send(sub->port_ref, 2u, msg_sect);
 243                         mng.link_subscriptions++;
 244                         return;
 245                 }
 246         default:
 247                 rv = tipc_cfg_cmd(msg, data, sz, (u32 *)&msg_sect[1].iov_len, orig);
 248         }
 249 exit:
 250         rmsg.result_len = htonl(msg_sect[1].iov_len);
 251         rmsg.retval = htonl(rv);
 252         tipc_cfg_respond(msg_sect, 2u, orig);
 253 }
 254 #endif
 255
 256 #define MAX_STATS_INFO 2000
 257
 258 static struct sk_buff *tipc_show_stats(void)
 259 {
 260         struct sk_buff *buf;
 261         struct tlv_desc *rep_tlv;
 262         struct print_buf pb;
 263         int str_len;
 264         u32 value;
 265
 266         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 267                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 268
 269         value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
 270         if (value != 0)
 271                 return tipc_cfg_reply_error_string("unsupported argument");
 272
 273         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));
 274         if (buf == NULL)
 275                 return NULL;
 276
 277         rep_tlv = (struct tlv_desc *)buf->data;
 278         tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);
 279
 280         tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "\n");
 281
 282         /* Use additional tipc_printf()'s to return more info ... */
 283
 284         str_len = tipc_printbuf_validate(&pb);
 285         skb_put(buf, TLV_SPACE(str_len));
 286         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 287
 288         return buf;
 289 }
 290
 291 static struct sk_buff *cfg_enable_bearer(void)
 292 {
 293         struct tipc_bearer_config *args;
 294
 295         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 296                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 297
 298         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 299         if (tipc_enable_bearer(args->name,
 300                                ntohl(args->detect_scope),
 301                                ntohl(args->priority)))
 302                 return tipc_cfg_reply_error_string("unable to enable bearer");
 303
 304         return tipc_cfg_reply_none();
 305 }
 306
 307 static struct sk_buff *cfg_disable_bearer(void)
 308 {
 309         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 310                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 311
 312         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 313                 return tipc_cfg_reply_error_string("unable to disable bearer");
 314
 315         return tipc_cfg_reply_none();
 316 }
 317
 318 static struct sk_buff *cfg_set_own_addr(void)
 319 {
 320         u32 addr;
 321
 322         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 323                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 324
 325         addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 326         if (addr == tipc_own_addr)
 327                 return tipc_cfg_reply_none();
 328         if (!tipc_addr_node_valid(addr))
 329                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 330                                                    " (node address)");
 331         if (tipc_mode == TIPC_NET_MODE)
 332                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 333                                                    " (cannot change node address once assigned)");
 334
 335         /*
 336          * Must release all spinlocks before calling start_net() because
 337          * Linux version of TIPC calls eth_media_start() which calls
 338          * register_netdevice_notifier() which may block!
 339          *
 340          * Temporarily releasing the lock should be harmless for non-Linux TIPC,
 341          * but Linux version of eth_media_start() should really be reworked
 342          * so that it can be called with spinlocks held.
 343          */
 344
 345         spin_unlock_bh(&config_lock);
 346         tipc_core_start_net(addr);
 347         spin_lock_bh(&config_lock);
 348         return tipc_cfg_reply_none();
 349 }
 350
 351 static struct sk_buff *cfg_set_remote_mng(void)
 352 {
 353         u32 value;
 354
 355         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 356                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 357
 358         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 359         tipc_remote_management = (value != 0);
 360         return tipc_cfg_reply_none();
 361 }
 362
 363 static struct sk_buff *cfg_set_max_publications(void)
 364 {
 365         u32 value;
 366
 367         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 368                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 369
 370         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 371         if (value != delimit(value, 1, 65535))
 372                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 373                                                    " (max publications must be 1-65535)");
 374         tipc_max_publications = value;
 375         return tipc_cfg_reply_none();
 376 }
 377
 378 static struct sk_buff *cfg_set_max_subscriptions(void)
 379 {
 380         u32 value;
 381
 382         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 383                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 384
 385         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 386         if (value != delimit(value, 1, 65535))
 387                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 388                                                    " (max subscriptions must be 1-65535");
 389         tipc_max_subscriptions = value;
 390         return tipc_cfg_reply_none();
 391 }
 392
 393 static struct sk_buff *cfg_set_max_ports(void)
 394 {
 395         u32 value;
 396
 397         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 398                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 399         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 400         if (value == tipc_max_ports)
 401                 return tipc_cfg_reply_none();
 402         if (value != delimit(value, 127, 65535))
 403                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 404                                                    " (max ports must be 127-65535)");
 405         if (tipc_mode != TIPC_NOT_RUNNING)
 406                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 407                         " (cannot change max ports while TIPC is active)");
 408         tipc_max_ports = value;
 409         return tipc_cfg_reply_none();
 410 }
 411
 412 static struct sk_buff *cfg_set_max_zones(void)
 413 {
 414         u32 value;
 415
 416         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 417                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 418         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 419         if (value == tipc_max_zones)
 420                 return tipc_cfg_reply_none();
 421         if (value != delimit(value, 1, 255))
 422                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 423                                                    " (max zones must be 1-255)");
 424         if (tipc_mode == TIPC_NET_MODE)
 425                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 426                         " (cannot change max zones once TIPC has joined a network)");
 427         tipc_max_zones = value;
 428         return tipc_cfg_reply_none();
 429 }
 430
 431 static struct sk_buff *cfg_set_max_clusters(void)
 432 {
 433         u32 value;
 434
 435         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 436                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 437         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 438         if (value != delimit(value, 1, 1))
 439                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 440                                                    " (max clusters fixed at 1)");
 441         return tipc_cfg_reply_none();
 442 }
 443
 444 static struct sk_buff *cfg_set_max_nodes(void)
 445 {
 446         u32 value;
 447
 448         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 449                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 450         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 451         if (value == tipc_max_nodes)
 452                 return tipc_cfg_reply_none();
 453         if (value != delimit(value, 8, 2047))
 454                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 455                                                    " (max nodes must be 8-2047)");
 456         if (tipc_mode == TIPC_NET_MODE)
 457                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 458                         " (cannot change max nodes once TIPC has joined a network)");
 459         tipc_max_nodes = value;
 460         return tipc_cfg_reply_none();
 461 }
 462
 463 static struct sk_buff *cfg_set_max_slaves(void)
 464 {
 465         u32 value;
 466
 467         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 468                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 469         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 470         if (value != 0)
 471                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 472                                                    " (max secondary nodes fixed at 0)");
 473         return tipc_cfg_reply_none();
 474 }
 475
 476 static struct sk_buff *cfg_set_netid(void)
 477 {
 478         u32 value;
 479
 480         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 481                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 482         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 483         if (value == tipc_net_id)
 484                 return tipc_cfg_reply_none();
 485         if (value != delimit(value, 1, 9999))
 486                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 487                                                    " (network id must be 1-9999)");
 488         if (tipc_mode == TIPC_NET_MODE)
 489                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 490                         " (cannot change network id once TIPC has joined a network)");
 491         tipc_net_id = value;
 492         return tipc_cfg_reply_none();
 493 }
 494
 495 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 496                                 int request_space, int reply_headroom)
 497 {
 498         struct sk_buff *rep_tlv_buf;
 499
 500         spin_lock_bh(&config_lock);
 501
 502         /* Save request and reply details in a well-known location */
 503
 504         req_tlv_area = request_area;
 505         req_tlv_space = request_space;
 506         rep_headroom = reply_headroom;
 507
 508         /* Check command authorization */
 509
 510         if (likely(orig_node == tipc_own_addr)) {
 511                 /* command is permitted */
 512         } else if (cmd >= 0x8000) {
 513                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 514                                                           " (cannot be done remotely)");
 515                 goto exit;
 516         } else if (!tipc_remote_management) {
 517                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 518                 goto exit;
 519         }
 520         else if (cmd >= 0x4000) {
 521                 u32 domain = 0;
 522
 523                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 524                     (domain != orig_node)) {
 525                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 526                         goto exit;
 527                 }
 528         }
 529
 530         /* Call appropriate processing routine */
 531
 532         switch (cmd) {
 533         case TIPC_CMD_NOOP:
 534                 rep_tlv_buf = tipc_cfg_reply_none();
 535                 break;
 536         case TIPC_CMD_GET_NODES:
 537                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 538                 break;
 539         case TIPC_CMD_GET_LINKS:
 540                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 541                 break;
 542         case TIPC_CMD_SHOW_LINK_STATS:
 543                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 544                 break;
 545         case TIPC_CMD_RESET_LINK_STATS:
 546                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 547                 break;
 548         case TIPC_CMD_SHOW_NAME_TABLE:
 549                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 550                 break;
 551         case TIPC_CMD_GET_BEARER_NAMES:
 552                 rep_tlv_buf = tipc_bearer_get_names();
 553                 break;
 554         case TIPC_CMD_GET_MEDIA_NAMES:
 555                 rep_tlv_buf = tipc_media_get_names();
 556                 break;
 557         case TIPC_CMD_SHOW_PORTS:
 558                 rep_tlv_buf = tipc_port_get_ports();
 559                 break;
 560 #if 0
 561         case TIPC_CMD_SHOW_PORT_STATS:
 562                 rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
 563                 break;
 564         case TIPC_CMD_RESET_PORT_STATS:
 565                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
 566                 break;
 567 #endif
 568         case TIPC_CMD_SET_LOG_SIZE:
 569                 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
 570                 break;
 571         case TIPC_CMD_DUMP_LOG:
 572                 rep_tlv_buf = tipc_log_dump();
 573                 break;
 574         case TIPC_CMD_SHOW_STATS:
 575                 rep_tlv_buf = tipc_show_stats();
 576                 break;
 577         case TIPC_CMD_SET_LINK_TOL:
 578         case TIPC_CMD_SET_LINK_PRI:
 579         case TIPC_CMD_SET_LINK_WINDOW:
 580                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 581                 break;
 582         case TIPC_CMD_ENABLE_BEARER:
 583                 rep_tlv_buf = cfg_enable_bearer();
 584                 break;
 585         case TIPC_CMD_DISABLE_BEARER:
 586                 rep_tlv_buf = cfg_disable_bearer();
 587                 break;
 588         case TIPC_CMD_SET_NODE_ADDR:
 589                 rep_tlv_buf = cfg_set_own_addr();
 590                 break;
 591         case TIPC_CMD_SET_REMOTE_MNG:
 592                 rep_tlv_buf = cfg_set_remote_mng();
 593                 break;
 594         case TIPC_CMD_SET_MAX_PORTS:
 595                 rep_tlv_buf = cfg_set_max_ports();
 596                 break;
 597         case TIPC_CMD_SET_MAX_PUBL:
 598                 rep_tlv_buf = cfg_set_max_publications();
 599                 break;
 600         case TIPC_CMD_SET_MAX_SUBSCR:
 601                 rep_tlv_buf = cfg_set_max_subscriptions();
 602                 break;
 603         case TIPC_CMD_SET_MAX_ZONES:
 604                 rep_tlv_buf = cfg_set_max_zones();
 605                 break;
 606         case TIPC_CMD_SET_MAX_CLUSTERS:
 607                 rep_tlv_buf = cfg_set_max_clusters();
 608                 break;
 609         case TIPC_CMD_SET_MAX_NODES:
 610                 rep_tlv_buf = cfg_set_max_nodes();
 611                 break;
 612         case TIPC_CMD_SET_MAX_SLAVES:
 613                 rep_tlv_buf = cfg_set_max_slaves();
 614                 break;
 615         case TIPC_CMD_SET_NETID:
 616                 rep_tlv_buf = cfg_set_netid();
 617                 break;
 618         case TIPC_CMD_GET_REMOTE_MNG:
 619                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 620                 break;
 621         case TIPC_CMD_GET_MAX_PORTS:
 622                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 623                 break;
 624         case TIPC_CMD_GET_MAX_PUBL:
 625                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 626                 break;
 627         case TIPC_CMD_GET_MAX_SUBSCR:
 628                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 629                 break;
 630         case TIPC_CMD_GET_MAX_ZONES:
 631                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
 632                 break;
 633         case TIPC_CMD_GET_MAX_CLUSTERS:
 634                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
 635                 break;
 636         case TIPC_CMD_GET_MAX_NODES:
 637                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
 638                 break;
 639         case TIPC_CMD_GET_MAX_SLAVES:
 640                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
 641                 break;
 642         case TIPC_CMD_GET_NETID:
 643                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 644                 break;
 645         case TIPC_CMD_NOT_NET_ADMIN:
 646                 rep_tlv_buf =
 647                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 648                 break;
 649         default:
 650                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 651                                                           " (unknown command)");
 652                 break;
 653         }
 654
 655         /* Return reply buffer */
 656 exit:
 657         spin_unlock_bh(&config_lock);
 658         return rep_tlv_buf;
 659 }
 660
 661 static void cfg_named_msg_event(void *userdata,
 662                                 u32 port_ref,
 663                                 struct sk_buff **buf,
 664                                 const unchar *msg,
 665                                 u32 size,
 666                                 u32 importance,
 667                                 struct tipc_portid const *orig,
 668                                 struct tipc_name_seq const *dest)
 669 {
 670         struct tipc_cfg_msg_hdr *req_hdr;
 671         struct tipc_cfg_msg_hdr *rep_hdr;
 672         struct sk_buff *rep_buf;
 673
 674         /* Validate configuration message header (ignore invalid message) */
 675
 676         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 677         if ((size < sizeof(*req_hdr)) ||
 678             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 679             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 680                 warn("Invalid configuration message discarded\n");
 681                 return;
 682         }
 683
 684         /* Generate reply for request (if can't, return request) */
 685
 686         rep_buf = tipc_cfg_do_cmd(orig->node,
 687                                   ntohs(req_hdr->tcm_type),
 688                                   msg + sizeof(*req_hdr),
 689                                   size - sizeof(*req_hdr),
 690                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 691         if (rep_buf) {
 692                 skb_push(rep_buf, sizeof(*rep_hdr));
 693                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 694                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 695                 rep_hdr->tcm_len = htonl(rep_buf->len);
 696                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 697         } else {
 698                 rep_buf = *buf;
 699                 *buf = NULL;
 700         }
 701
 702         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 703         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 704 }
 705
 706 int tipc_cfg_init(void)
 707 {
 708         struct tipc_name_seq seq;
 709         int res;
 710
 711         res = tipc_attach(&mng.user_ref, NULL, NULL);
 712         if (res)
 713                 goto failed;
 714
 715         res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
 716                               NULL, NULL, NULL,
 717                               NULL, cfg_named_msg_event, NULL,
 718                               NULL, &mng.port_ref);
 719         if (res)
 720                 goto failed;
 721
 722         seq.type = TIPC_CFG_SRV;
 723         seq.lower = seq.upper = tipc_own_addr;
 724         res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
 725         if (res)
 726                 goto failed;
 727
 728         return 0;
 729
 730 failed:
 731         err("Unable to create configuration service\n");
 732         tipc_detach(mng.user_ref);
 733         mng.user_ref = 0;
 734         return res;
 735 }
 736
 737 void tipc_cfg_stop(void)
 738 {
 739         if (mng.user_ref) {
 740                 tipc_detach(mng.user_ref);
 741                 mng.user_ref = 0;
 742         }
 743 }