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 "port.h"
  39 #include "link.h"
  40 #include "name_table.h"
  41 #include "user_reg.h"
  42 #include "config.h"
  43
  44 struct manager {
  45         u32 user_ref;
  46         u32 port_ref;
  47 };
  48
  49 static struct manager mng = { 0};
  50
  51 static DEFINE_SPINLOCK(config_lock);
  52
  53 static const void *req_tlv_area;        /* request message TLV area */
  54 static int req_tlv_space;               /* request message TLV area size */
  55 static int rep_headroom;                /* reply message headroom to use */
  56
  57
  58 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
  59 {
  60         struct sk_buff *buf;
  61
  62         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
  63         if (buf)
  64                 skb_reserve(buf, rep_headroom);
  65         return buf;
  66 }
  67
  68 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
  69                         void *tlv_data, int tlv_data_size)
  70 {
  71         struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
  72         int new_tlv_space = TLV_SPACE(tlv_data_size);
  73
  74         if (skb_tailroom(buf) < new_tlv_space) {
  75                 dbg("tipc_cfg_append_tlv unable to append TLV\n");
  76                 return 0;
  77         }
  78         skb_put(buf, new_tlv_space);
  79         tlv->tlv_type = htons(tlv_type);
  80         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
  81         if (tlv_data_size && tlv_data)
  82                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
  83         return 1;
  84 }
  85
  86 static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
  87 {
  88         struct sk_buff *buf;
  89         __be32 value_net;
  90
  91         buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
  92         if (buf) {
  93                 value_net = htonl(value);
  94                 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
  95                                     sizeof(value_net));
  96         }
  97         return buf;
  98 }
  99
 100 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
 101 {
 102         return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
 103 }
 104
 105 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
 106 {
 107         struct sk_buff *buf;
 108         int string_len = strlen(string) + 1;
 109
 110         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
 111         if (buf)
 112                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
 113         return buf;
 114 }
 115
 116 #define MAX_STATS_INFO 2000
 117
 118 static struct sk_buff *tipc_show_stats(void)
 119 {
 120         struct sk_buff *buf;
 121         struct tlv_desc *rep_tlv;
 122         struct print_buf pb;
 123         int str_len;
 124         u32 value;
 125
 126         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 127                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 128
 129         value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
 130         if (value != 0)
 131                 return tipc_cfg_reply_error_string("unsupported argument");
 132
 133         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));
 134         if (buf == NULL)
 135                 return NULL;
 136
 137         rep_tlv = (struct tlv_desc *)buf->data;
 138         tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);
 139
 140         tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "\n");
 141
 142         /* Use additional tipc_printf()'s to return more info ... */
 143
 144         str_len = tipc_printbuf_validate(&pb);
 145         skb_put(buf, TLV_SPACE(str_len));
 146         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 147
 148         return buf;
 149 }
 150
 151 static struct sk_buff *cfg_enable_bearer(void)
 152 {
 153         struct tipc_bearer_config *args;
 154
 155         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 156                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 157
 158         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 159         if (tipc_enable_bearer(args->name,
 160                                ntohl(args->detect_scope),
 161                                ntohl(args->priority)))
 162                 return tipc_cfg_reply_error_string("unable to enable bearer");
 163
 164         return tipc_cfg_reply_none();
 165 }
 166
 167 static struct sk_buff *cfg_disable_bearer(void)
 168 {
 169         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 170                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 171
 172         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 173                 return tipc_cfg_reply_error_string("unable to disable bearer");
 174
 175         return tipc_cfg_reply_none();
 176 }
 177
 178 static struct sk_buff *cfg_set_own_addr(void)
 179 {
 180         u32 addr;
 181
 182         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 183                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 184
 185         addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 186         if (addr == tipc_own_addr)
 187                 return tipc_cfg_reply_none();
 188         if (!tipc_addr_node_valid(addr))
 189                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 190                                                    " (node address)");
 191         if (tipc_mode == TIPC_NET_MODE)
 192                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 193                                                    " (cannot change node address once assigned)");
 194
 195         /*
 196          * Must release all spinlocks before calling start_net() because
 197          * Linux version of TIPC calls eth_media_start() which calls
 198          * register_netdevice_notifier() which may block!
 199          *
 200          * Temporarily releasing the lock should be harmless for non-Linux TIPC,
 201          * but Linux version of eth_media_start() should really be reworked
 202          * so that it can be called with spinlocks held.
 203          */
 204
 205         spin_unlock_bh(&config_lock);
 206         tipc_core_start_net(addr);
 207         spin_lock_bh(&config_lock);
 208         return tipc_cfg_reply_none();
 209 }
 210
 211 static struct sk_buff *cfg_set_remote_mng(void)
 212 {
 213         u32 value;
 214
 215         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 216                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 217
 218         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 219         tipc_remote_management = (value != 0);
 220         return tipc_cfg_reply_none();
 221 }
 222
 223 static struct sk_buff *cfg_set_max_publications(void)
 224 {
 225         u32 value;
 226
 227         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 228                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 229
 230         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 231         if (value != delimit(value, 1, 65535))
 232                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 233                                                    " (max publications must be 1-65535)");
 234         tipc_max_publications = value;
 235         return tipc_cfg_reply_none();
 236 }
 237
 238 static struct sk_buff *cfg_set_max_subscriptions(void)
 239 {
 240         u32 value;
 241
 242         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 243                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 244
 245         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 246         if (value != delimit(value, 1, 65535))
 247                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 248                                                    " (max subscriptions must be 1-65535");
 249         tipc_max_subscriptions = value;
 250         return tipc_cfg_reply_none();
 251 }
 252
 253 static struct sk_buff *cfg_set_max_ports(void)
 254 {
 255         u32 value;
 256
 257         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 258                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 259         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 260         if (value == tipc_max_ports)
 261                 return tipc_cfg_reply_none();
 262         if (value != delimit(value, 127, 65535))
 263                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 264                                                    " (max ports must be 127-65535)");
 265         if (tipc_mode != TIPC_NOT_RUNNING)
 266                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 267                         " (cannot change max ports while TIPC is active)");
 268         tipc_max_ports = value;
 269         return tipc_cfg_reply_none();
 270 }
 271
 272 static struct sk_buff *cfg_set_max_zones(void)
 273 {
 274         u32 value;
 275
 276         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 277                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 278         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 279         if (value == tipc_max_zones)
 280                 return tipc_cfg_reply_none();
 281         if (value != delimit(value, 1, 255))
 282                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 283                                                    " (max zones must be 1-255)");
 284         if (tipc_mode == TIPC_NET_MODE)
 285                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 286                         " (cannot change max zones once TIPC has joined a network)");
 287         tipc_max_zones = value;
 288         return tipc_cfg_reply_none();
 289 }
 290
 291 static struct sk_buff *cfg_set_max_clusters(void)
 292 {
 293         u32 value;
 294
 295         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 296                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 297         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 298         if (value != delimit(value, 1, 1))
 299                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 300                                                    " (max clusters fixed at 1)");
 301         return tipc_cfg_reply_none();
 302 }
 303
 304 static struct sk_buff *cfg_set_max_nodes(void)
 305 {
 306         u32 value;
 307
 308         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 309                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 310         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 311         if (value == tipc_max_nodes)
 312                 return tipc_cfg_reply_none();
 313         if (value != delimit(value, 8, 2047))
 314                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 315                                                    " (max nodes must be 8-2047)");
 316         if (tipc_mode == TIPC_NET_MODE)
 317                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 318                         " (cannot change max nodes once TIPC has joined a network)");
 319         tipc_max_nodes = value;
 320         return tipc_cfg_reply_none();
 321 }
 322
 323 static struct sk_buff *cfg_set_max_slaves(void)
 324 {
 325         u32 value;
 326
 327         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 328                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 329         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 330         if (value != 0)
 331                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 332                                                    " (max secondary nodes fixed at 0)");
 333         return tipc_cfg_reply_none();
 334 }
 335
 336 static struct sk_buff *cfg_set_netid(void)
 337 {
 338         u32 value;
 339
 340         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 341                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 342         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 343         if (value == tipc_net_id)
 344                 return tipc_cfg_reply_none();
 345         if (value != delimit(value, 1, 9999))
 346                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 347                                                    " (network id must be 1-9999)");
 348         if (tipc_mode == TIPC_NET_MODE)
 349                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 350                         " (cannot change network id once TIPC has joined a network)");
 351         tipc_net_id = value;
 352         return tipc_cfg_reply_none();
 353 }
 354
 355 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 356                                 int request_space, int reply_headroom)
 357 {
 358         struct sk_buff *rep_tlv_buf;
 359
 360         spin_lock_bh(&config_lock);
 361
 362         /* Save request and reply details in a well-known location */
 363
 364         req_tlv_area = request_area;
 365         req_tlv_space = request_space;
 366         rep_headroom = reply_headroom;
 367
 368         /* Check command authorization */
 369
 370         if (likely(orig_node == tipc_own_addr)) {
 371                 /* command is permitted */
 372         } else if (cmd >= 0x8000) {
 373                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 374                                                           " (cannot be done remotely)");
 375                 goto exit;
 376         } else if (!tipc_remote_management) {
 377                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 378                 goto exit;
 379         }
 380         else if (cmd >= 0x4000) {
 381                 u32 domain = 0;
 382
 383                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 384                     (domain != orig_node)) {
 385                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 386                         goto exit;
 387                 }
 388         }
 389
 390         /* Call appropriate processing routine */
 391
 392         switch (cmd) {
 393         case TIPC_CMD_NOOP:
 394                 rep_tlv_buf = tipc_cfg_reply_none();
 395                 break;
 396         case TIPC_CMD_GET_NODES:
 397                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 398                 break;
 399         case TIPC_CMD_GET_LINKS:
 400                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 401                 break;
 402         case TIPC_CMD_SHOW_LINK_STATS:
 403                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 404                 break;
 405         case TIPC_CMD_RESET_LINK_STATS:
 406                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 407                 break;
 408         case TIPC_CMD_SHOW_NAME_TABLE:
 409                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 410                 break;
 411         case TIPC_CMD_GET_BEARER_NAMES:
 412                 rep_tlv_buf = tipc_bearer_get_names();
 413                 break;
 414         case TIPC_CMD_GET_MEDIA_NAMES:
 415                 rep_tlv_buf = tipc_media_get_names();
 416                 break;
 417         case TIPC_CMD_SHOW_PORTS:
 418                 rep_tlv_buf = tipc_port_get_ports();
 419                 break;
 420         case TIPC_CMD_SET_LOG_SIZE:
 421                 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
 422                 break;
 423         case TIPC_CMD_DUMP_LOG:
 424                 rep_tlv_buf = tipc_log_dump();
 425                 break;
 426         case TIPC_CMD_SHOW_STATS:
 427                 rep_tlv_buf = tipc_show_stats();
 428                 break;
 429         case TIPC_CMD_SET_LINK_TOL:
 430         case TIPC_CMD_SET_LINK_PRI:
 431         case TIPC_CMD_SET_LINK_WINDOW:
 432                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 433                 break;
 434         case TIPC_CMD_ENABLE_BEARER:
 435                 rep_tlv_buf = cfg_enable_bearer();
 436                 break;
 437         case TIPC_CMD_DISABLE_BEARER:
 438                 rep_tlv_buf = cfg_disable_bearer();
 439                 break;
 440         case TIPC_CMD_SET_NODE_ADDR:
 441                 rep_tlv_buf = cfg_set_own_addr();
 442                 break;
 443         case TIPC_CMD_SET_REMOTE_MNG:
 444                 rep_tlv_buf = cfg_set_remote_mng();
 445                 break;
 446         case TIPC_CMD_SET_MAX_PORTS:
 447                 rep_tlv_buf = cfg_set_max_ports();
 448                 break;
 449         case TIPC_CMD_SET_MAX_PUBL:
 450                 rep_tlv_buf = cfg_set_max_publications();
 451                 break;
 452         case TIPC_CMD_SET_MAX_SUBSCR:
 453                 rep_tlv_buf = cfg_set_max_subscriptions();
 454                 break;
 455         case TIPC_CMD_SET_MAX_ZONES:
 456                 rep_tlv_buf = cfg_set_max_zones();
 457                 break;
 458         case TIPC_CMD_SET_MAX_CLUSTERS:
 459                 rep_tlv_buf = cfg_set_max_clusters();
 460                 break;
 461         case TIPC_CMD_SET_MAX_NODES:
 462                 rep_tlv_buf = cfg_set_max_nodes();
 463                 break;
 464         case TIPC_CMD_SET_MAX_SLAVES:
 465                 rep_tlv_buf = cfg_set_max_slaves();
 466                 break;
 467         case TIPC_CMD_SET_NETID:
 468                 rep_tlv_buf = cfg_set_netid();
 469                 break;
 470         case TIPC_CMD_GET_REMOTE_MNG:
 471                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 472                 break;
 473         case TIPC_CMD_GET_MAX_PORTS:
 474                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 475                 break;
 476         case TIPC_CMD_GET_MAX_PUBL:
 477                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 478                 break;
 479         case TIPC_CMD_GET_MAX_SUBSCR:
 480                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 481                 break;
 482         case TIPC_CMD_GET_MAX_ZONES:
 483                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
 484                 break;
 485         case TIPC_CMD_GET_MAX_CLUSTERS:
 486                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
 487                 break;
 488         case TIPC_CMD_GET_MAX_NODES:
 489                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
 490                 break;
 491         case TIPC_CMD_GET_MAX_SLAVES:
 492                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
 493                 break;
 494         case TIPC_CMD_GET_NETID:
 495                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 496                 break;
 497         case TIPC_CMD_NOT_NET_ADMIN:
 498                 rep_tlv_buf =
 499                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 500                 break;
 501         default:
 502                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 503                                                           " (unknown command)");
 504                 break;
 505         }
 506
 507         /* Return reply buffer */
 508 exit:
 509         spin_unlock_bh(&config_lock);
 510         return rep_tlv_buf;
 511 }
 512
 513 static void cfg_named_msg_event(void *userdata,
 514                                 u32 port_ref,
 515                                 struct sk_buff **buf,
 516                                 const unchar *msg,
 517                                 u32 size,
 518                                 u32 importance,
 519                                 struct tipc_portid const *orig,
 520                                 struct tipc_name_seq const *dest)
 521 {
 522         struct tipc_cfg_msg_hdr *req_hdr;
 523         struct tipc_cfg_msg_hdr *rep_hdr;
 524         struct sk_buff *rep_buf;
 525
 526         /* Validate configuration message header (ignore invalid message) */
 527
 528         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 529         if ((size < sizeof(*req_hdr)) ||
 530             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 531             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 532                 warn("Invalid configuration message discarded\n");
 533                 return;
 534         }
 535
 536         /* Generate reply for request (if can't, return request) */
 537
 538         rep_buf = tipc_cfg_do_cmd(orig->node,
 539                                   ntohs(req_hdr->tcm_type),
 540                                   msg + sizeof(*req_hdr),
 541                                   size - sizeof(*req_hdr),
 542                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 543         if (rep_buf) {
 544                 skb_push(rep_buf, sizeof(*rep_hdr));
 545                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 546                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 547                 rep_hdr->tcm_len = htonl(rep_buf->len);
 548                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 549         } else {
 550                 rep_buf = *buf;
 551                 *buf = NULL;
 552         }
 553
 554         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 555         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 556 }
 557
 558 int tipc_cfg_init(void)
 559 {
 560         struct tipc_name_seq seq;
 561         int res;
 562
 563         res = tipc_attach(&mng.user_ref, NULL, NULL);
 564         if (res)
 565                 goto failed;
 566
 567         res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
 568                               NULL, NULL, NULL,
 569                               NULL, cfg_named_msg_event, NULL,
 570                               NULL, &mng.port_ref);
 571         if (res)
 572                 goto failed;
 573
 574         seq.type = TIPC_CFG_SRV;
 575         seq.lower = seq.upper = tipc_own_addr;
 576         res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
 577         if (res)
 578                 goto failed;
 579
 580         return 0;
 581
 582 failed:
 583         err("Unable to create configuration service\n");
 584         tipc_detach(mng.user_ref);
 585         mng.user_ref = 0;
 586         return res;
 587 }
 588
 589 void tipc_cfg_stop(void)
 590 {
 591         if (mng.user_ref) {
 592                 tipc_detach(mng.user_ref);
 593                 mng.user_ref = 0;
 594         }
 595 }