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         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
 297         /*
 298          * Must release all spinlocks before calling start_net() because
 299          * Linux version of TIPC calls eth_media_start() which calls
 300          * register_netdevice_notifier() which may block!
 301          *
 302          * Temporarily releasing the lock should be harmless for non-Linux TIPC,
 303          * but Linux version of eth_media_start() should really be reworked
 304          * so that it can be called with spinlocks held.
 305          */
 306
 307         spin_unlock_bh(&config_lock);
 308         tipc_core_start_net(addr);
 309         spin_lock_bh(&config_lock);
 310         return tipc_cfg_reply_none();
 311 }
 312
 313 static struct sk_buff *cfg_set_remote_mng(void)
 314 {
 315         u32 value;
 316
 317         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 318                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 319
 320         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 321         tipc_remote_management = (value != 0);
 322         return tipc_cfg_reply_none();
 323 }
 324
 325 static struct sk_buff *cfg_set_max_publications(void)
 326 {
 327         u32 value;
 328
 329         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 330                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 331
 332         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 333         if (value != delimit(value, 1, 65535))
 334                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 335                                                    " (max publications must be 1-65535)");
 336         tipc_max_publications = value;
 337         return tipc_cfg_reply_none();
 338 }
 339
 340 static struct sk_buff *cfg_set_max_subscriptions(void)
 341 {
 342         u32 value;
 343
 344         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 345                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 346
 347         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 348         if (value != delimit(value, 1, 65535))
 349                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 350                                                    " (max subscriptions must be 1-65535");
 351         tipc_max_subscriptions = value;
 352         return tipc_cfg_reply_none();
 353 }
 354
 355 static struct sk_buff *cfg_set_max_ports(void)
 356 {
 357         u32 value;
 358
 359         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 360                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 361         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 362         if (value == tipc_max_ports)
 363                 return tipc_cfg_reply_none();
 364         if (value != delimit(value, 127, 65535))
 365                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 366                                                    " (max ports must be 127-65535)");
 367         if (tipc_mode != TIPC_NOT_RUNNING)
 368                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 369                         " (cannot change max ports while TIPC is active)");
 370         tipc_max_ports = value;
 371         return tipc_cfg_reply_none();
 372 }
 373
 374 static struct sk_buff *cfg_set_max_zones(void)
 375 {
 376         u32 value;
 377
 378         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 379                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 380         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 381         if (value == tipc_max_zones)
 382                 return tipc_cfg_reply_none();
 383         if (value != delimit(value, 1, 255))
 384                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 385                                                    " (max zones must be 1-255)");
 386         if (tipc_mode == TIPC_NET_MODE)
 387                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 388                         " (cannot change max zones once TIPC has joined a network)");
 389         tipc_max_zones = value;
 390         return tipc_cfg_reply_none();
 391 }
 392
 393 static struct sk_buff *cfg_set_max_clusters(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 != delimit(value, 1, 1))
 401                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 402                                                    " (max clusters fixed at 1)");
 403         return tipc_cfg_reply_none();
 404 }
 405
 406 static struct sk_buff *cfg_set_max_nodes(void)
 407 {
 408         u32 value;
 409
 410         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 411                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 412         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 413         if (value == tipc_max_nodes)
 414                 return tipc_cfg_reply_none();
 415         if (value != delimit(value, 8, 2047))
 416                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 417                                                    " (max nodes must be 8-2047)");
 418         if (tipc_mode == TIPC_NET_MODE)
 419                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 420                         " (cannot change max nodes once TIPC has joined a network)");
 421         tipc_max_nodes = value;
 422         return tipc_cfg_reply_none();
 423 }
 424
 425 static struct sk_buff *cfg_set_max_slaves(void)
 426 {
 427         u32 value;
 428
 429         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 430                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 431         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 432         if (value != 0)
 433                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 434                                                    " (max secondary nodes fixed at 0)");
 435         return tipc_cfg_reply_none();
 436 }
 437
 438 static struct sk_buff *cfg_set_netid(void)
 439 {
 440         u32 value;
 441
 442         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 443                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 444         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 445         if (value == tipc_net_id)
 446                 return tipc_cfg_reply_none();
 447         if (value != delimit(value, 1, 9999))
 448                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 449                                                    " (network id must be 1-9999)");
 450         if (tipc_mode == TIPC_NET_MODE)
 451                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 452                         " (cannot change network id once TIPC has joined a network)");
 453         tipc_net_id = value;
 454         return tipc_cfg_reply_none();
 455 }
 456
 457 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 458                                 int request_space, int reply_headroom)
 459 {
 460         struct sk_buff *rep_tlv_buf;
 461
 462         spin_lock_bh(&config_lock);
 463
 464         /* Save request and reply details in a well-known location */
 465
 466         req_tlv_area = request_area;
 467         req_tlv_space = request_space;
 468         rep_headroom = reply_headroom;
 469
 470         /* Check command authorization */
 471
 472         if (likely(orig_node == tipc_own_addr)) {
 473                 /* command is permitted */
 474         } else if (cmd >= 0x8000) {
 475                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 476                                                           " (cannot be done remotely)");
 477                 goto exit;
 478         } else if (!tipc_remote_management) {
 479                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 480                 goto exit;
 481         }
 482         else if (cmd >= 0x4000) {
 483                 u32 domain = 0;
 484
 485                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 486                     (domain != orig_node)) {
 487                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 488                         goto exit;
 489                 }
 490         }
 491
 492         /* Call appropriate processing routine */
 493
 494         switch (cmd) {
 495         case TIPC_CMD_NOOP:
 496                 rep_tlv_buf = tipc_cfg_reply_none();
 497                 break;
 498         case TIPC_CMD_GET_NODES:
 499                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 500                 break;
 501         case TIPC_CMD_GET_LINKS:
 502                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 503                 break;
 504         case TIPC_CMD_SHOW_LINK_STATS:
 505                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 506                 break;
 507         case TIPC_CMD_RESET_LINK_STATS:
 508                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 509                 break;
 510         case TIPC_CMD_SHOW_NAME_TABLE:
 511                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 512                 break;
 513         case TIPC_CMD_GET_BEARER_NAMES:
 514                 rep_tlv_buf = tipc_bearer_get_names();
 515                 break;
 516         case TIPC_CMD_GET_MEDIA_NAMES:
 517                 rep_tlv_buf = tipc_media_get_names();
 518                 break;
 519         case TIPC_CMD_SHOW_PORTS:
 520                 rep_tlv_buf = tipc_port_get_ports();
 521                 break;
 522 #if 0
 523         case TIPC_CMD_SHOW_PORT_STATS:
 524                 rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
 525                 break;
 526         case TIPC_CMD_RESET_PORT_STATS:
 527                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
 528                 break;
 529 #endif
 530         case TIPC_CMD_SET_LOG_SIZE:
 531                 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
 532                 break;
 533         case TIPC_CMD_DUMP_LOG:
 534                 rep_tlv_buf = tipc_log_dump();
 535                 break;
 536         case TIPC_CMD_SET_LINK_TOL:
 537         case TIPC_CMD_SET_LINK_PRI:
 538         case TIPC_CMD_SET_LINK_WINDOW:
 539                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 540                 break;
 541         case TIPC_CMD_ENABLE_BEARER:
 542                 rep_tlv_buf = cfg_enable_bearer();
 543                 break;
 544         case TIPC_CMD_DISABLE_BEARER:
 545                 rep_tlv_buf = cfg_disable_bearer();
 546                 break;
 547         case TIPC_CMD_SET_NODE_ADDR:
 548                 rep_tlv_buf = cfg_set_own_addr();
 549                 break;
 550         case TIPC_CMD_SET_REMOTE_MNG:
 551                 rep_tlv_buf = cfg_set_remote_mng();
 552                 break;
 553         case TIPC_CMD_SET_MAX_PORTS:
 554                 rep_tlv_buf = cfg_set_max_ports();
 555                 break;
 556         case TIPC_CMD_SET_MAX_PUBL:
 557                 rep_tlv_buf = cfg_set_max_publications();
 558                 break;
 559         case TIPC_CMD_SET_MAX_SUBSCR:
 560                 rep_tlv_buf = cfg_set_max_subscriptions();
 561                 break;
 562         case TIPC_CMD_SET_MAX_ZONES:
 563                 rep_tlv_buf = cfg_set_max_zones();
 564                 break;
 565         case TIPC_CMD_SET_MAX_CLUSTERS:
 566                 rep_tlv_buf = cfg_set_max_clusters();
 567                 break;
 568         case TIPC_CMD_SET_MAX_NODES:
 569                 rep_tlv_buf = cfg_set_max_nodes();
 570                 break;
 571         case TIPC_CMD_SET_MAX_SLAVES:
 572                 rep_tlv_buf = cfg_set_max_slaves();
 573                 break;
 574         case TIPC_CMD_SET_NETID:
 575                 rep_tlv_buf = cfg_set_netid();
 576                 break;
 577         case TIPC_CMD_GET_REMOTE_MNG:
 578                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 579                 break;
 580         case TIPC_CMD_GET_MAX_PORTS:
 581                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 582                 break;
 583         case TIPC_CMD_GET_MAX_PUBL:
 584                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 585                 break;
 586         case TIPC_CMD_GET_MAX_SUBSCR:
 587                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 588                 break;
 589         case TIPC_CMD_GET_MAX_ZONES:
 590                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
 591                 break;
 592         case TIPC_CMD_GET_MAX_CLUSTERS:
 593                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
 594                 break;
 595         case TIPC_CMD_GET_MAX_NODES:
 596                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
 597                 break;
 598         case TIPC_CMD_GET_MAX_SLAVES:
 599                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
 600                 break;
 601         case TIPC_CMD_GET_NETID:
 602                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 603                 break;
 604         case TIPC_CMD_NOT_NET_ADMIN:
 605                 rep_tlv_buf =
 606                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 607                 break;
 608         default:
 609                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 610                                                           " (unknown command)");
 611                 break;
 612         }
 613
 614         /* Return reply buffer */
 615 exit:
 616         spin_unlock_bh(&config_lock);
 617         return rep_tlv_buf;
 618 }
 619
 620 static void cfg_named_msg_event(void *userdata,
 621                                 u32 port_ref,
 622                                 struct sk_buff **buf,
 623                                 const unchar *msg,
 624                                 u32 size,
 625                                 u32 importance,
 626                                 struct tipc_portid const *orig,
 627                                 struct tipc_name_seq const *dest)
 628 {
 629         struct tipc_cfg_msg_hdr *req_hdr;
 630         struct tipc_cfg_msg_hdr *rep_hdr;
 631         struct sk_buff *rep_buf;
 632
 633         /* Validate configuration message header (ignore invalid message) */
 634
 635         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 636         if ((size < sizeof(*req_hdr)) ||
 637             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 638             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 639                 warn("Invalid configuration message discarded\n");
 640                 return;
 641         }
 642
 643         /* Generate reply for request (if can't, return request) */
 644
 645         rep_buf = tipc_cfg_do_cmd(orig->node,
 646                                   ntohs(req_hdr->tcm_type),
 647                                   msg + sizeof(*req_hdr),
 648                                   size - sizeof(*req_hdr),
 649                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 650         if (rep_buf) {
 651                 skb_push(rep_buf, sizeof(*rep_hdr));
 652                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 653                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 654                 rep_hdr->tcm_len = htonl(rep_buf->len);
 655                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 656         } else {
 657                 rep_buf = *buf;
 658                 *buf = NULL;
 659         }
 660
 661         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 662         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 663 }
 664
 665 int tipc_cfg_init(void)
 666 {
 667         struct tipc_name_seq seq;
 668         int res;
 669
 670         memset(&mng, 0, sizeof(mng));
 671         INIT_LIST_HEAD(&mng.link_subscribers);
 672
 673         res = tipc_attach(&mng.user_ref, NULL, NULL);
 674         if (res)
 675                 goto failed;
 676
 677         res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
 678                               NULL, NULL, NULL,
 679                               NULL, cfg_named_msg_event, NULL,
 680                               NULL, &mng.port_ref);
 681         if (res)
 682                 goto failed;
 683
 684         seq.type = TIPC_CFG_SRV;
 685         seq.lower = seq.upper = tipc_own_addr;
 686         res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
 687         if (res)
 688                 goto failed;
 689
 690         return 0;
 691
 692 failed:
 693         err("Unable to create configuration service\n");
 694         tipc_detach(mng.user_ref);
 695         mng.user_ref = 0;
 696         return res;
 697 }
 698
 699 void tipc_cfg_stop(void)
 700 {
 701         if (mng.user_ref) {
 702                 tipc_detach(mng.user_ref);
 703                 mng.user_ref = 0;
 704         }
 705 }