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 static 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 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
 113 {
 114         return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
 115 }
 116
 117 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
 118 {
 119         struct sk_buff *buf;
 120         int string_len = strlen(string) + 1;
 121
 122         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
 123         if (buf)
 124                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
 125         return buf;
 126 }
 127
 128 #define MAX_STATS_INFO 2000
 129
 130 static struct sk_buff *tipc_show_stats(void)
 131 {
 132         struct sk_buff *buf;
 133         struct tlv_desc *rep_tlv;
 134         struct print_buf pb;
 135         int str_len;
 136         u32 value;
 137
 138         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 139                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 140
 141         value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
 142         if (value != 0)
 143                 return tipc_cfg_reply_error_string("unsupported argument");
 144
 145         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));
 146         if (buf == NULL)
 147                 return NULL;
 148
 149         rep_tlv = (struct tlv_desc *)buf->data;
 150         tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);
 151
 152         tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "\n");
 153
 154         /* Use additional tipc_printf()'s to return more info ... */
 155
 156         str_len = tipc_printbuf_validate(&pb);
 157         skb_put(buf, TLV_SPACE(str_len));
 158         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 159
 160         return buf;
 161 }
 162
 163 static struct sk_buff *cfg_enable_bearer(void)
 164 {
 165         struct tipc_bearer_config *args;
 166
 167         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 168                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 169
 170         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 171         if (tipc_enable_bearer(args->name,
 172                                ntohl(args->detect_scope),
 173                                ntohl(args->priority)))
 174                 return tipc_cfg_reply_error_string("unable to enable bearer");
 175
 176         return tipc_cfg_reply_none();
 177 }
 178
 179 static struct sk_buff *cfg_disable_bearer(void)
 180 {
 181         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 182                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 183
 184         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 185                 return tipc_cfg_reply_error_string("unable to disable bearer");
 186
 187         return tipc_cfg_reply_none();
 188 }
 189
 190 static struct sk_buff *cfg_set_own_addr(void)
 191 {
 192         u32 addr;
 193
 194         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 195                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 196
 197         addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 198         if (addr == tipc_own_addr)
 199                 return tipc_cfg_reply_none();
 200         if (!tipc_addr_node_valid(addr))
 201                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 202                                                    " (node address)");
 203         if (tipc_mode == TIPC_NET_MODE)
 204                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 205                                                    " (cannot change node address once assigned)");
 206
 207         /*
 208          * Must release all spinlocks before calling start_net() because
 209          * Linux version of TIPC calls eth_media_start() which calls
 210          * register_netdevice_notifier() which may block!
 211          *
 212          * Temporarily releasing the lock should be harmless for non-Linux TIPC,
 213          * but Linux version of eth_media_start() should really be reworked
 214          * so that it can be called with spinlocks held.
 215          */
 216
 217         spin_unlock_bh(&config_lock);
 218         tipc_core_start_net(addr);
 219         spin_lock_bh(&config_lock);
 220         return tipc_cfg_reply_none();
 221 }
 222
 223 static struct sk_buff *cfg_set_remote_mng(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         tipc_remote_management = (value != 0);
 232         return tipc_cfg_reply_none();
 233 }
 234
 235 static struct sk_buff *cfg_set_max_publications(void)
 236 {
 237         u32 value;
 238
 239         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 240                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 241
 242         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 243         if (value != delimit(value, 1, 65535))
 244                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 245                                                    " (max publications must be 1-65535)");
 246         tipc_max_publications = value;
 247         return tipc_cfg_reply_none();
 248 }
 249
 250 static struct sk_buff *cfg_set_max_subscriptions(void)
 251 {
 252         u32 value;
 253
 254         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 255                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 256
 257         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 258         if (value != delimit(value, 1, 65535))
 259                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 260                                                    " (max subscriptions must be 1-65535");
 261         tipc_max_subscriptions = value;
 262         return tipc_cfg_reply_none();
 263 }
 264
 265 static struct sk_buff *cfg_set_max_ports(void)
 266 {
 267         u32 value;
 268
 269         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 270                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 271         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 272         if (value == tipc_max_ports)
 273                 return tipc_cfg_reply_none();
 274         if (value != delimit(value, 127, 65535))
 275                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 276                                                    " (max ports must be 127-65535)");
 277         if (tipc_mode != TIPC_NOT_RUNNING)
 278                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 279                         " (cannot change max ports while TIPC is active)");
 280         tipc_max_ports = value;
 281         return tipc_cfg_reply_none();
 282 }
 283
 284 static struct sk_buff *cfg_set_max_zones(void)
 285 {
 286         u32 value;
 287
 288         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 289                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 290         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 291         if (value == tipc_max_zones)
 292                 return tipc_cfg_reply_none();
 293         if (value != delimit(value, 1, 255))
 294                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 295                                                    " (max zones must be 1-255)");
 296         if (tipc_mode == TIPC_NET_MODE)
 297                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 298                         " (cannot change max zones once TIPC has joined a network)");
 299         tipc_max_zones = value;
 300         return tipc_cfg_reply_none();
 301 }
 302
 303 static struct sk_buff *cfg_set_max_clusters(void)
 304 {
 305         u32 value;
 306
 307         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 308                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 309         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 310         if (value != delimit(value, 1, 1))
 311                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 312                                                    " (max clusters fixed at 1)");
 313         return tipc_cfg_reply_none();
 314 }
 315
 316 static struct sk_buff *cfg_set_max_nodes(void)
 317 {
 318         u32 value;
 319
 320         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 321                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 322         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 323         if (value == tipc_max_nodes)
 324                 return tipc_cfg_reply_none();
 325         if (value != delimit(value, 8, 2047))
 326                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 327                                                    " (max nodes must be 8-2047)");
 328         if (tipc_mode == TIPC_NET_MODE)
 329                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 330                         " (cannot change max nodes once TIPC has joined a network)");
 331         tipc_max_nodes = value;
 332         return tipc_cfg_reply_none();
 333 }
 334
 335 static struct sk_buff *cfg_set_max_slaves(void)
 336 {
 337         u32 value;
 338
 339         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 340                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 341         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 342         if (value != 0)
 343                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 344                                                    " (max secondary nodes fixed at 0)");
 345         return tipc_cfg_reply_none();
 346 }
 347
 348 static struct sk_buff *cfg_set_netid(void)
 349 {
 350         u32 value;
 351
 352         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 353                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 354         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 355         if (value == tipc_net_id)
 356                 return tipc_cfg_reply_none();
 357         if (value != delimit(value, 1, 9999))
 358                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 359                                                    " (network id must be 1-9999)");
 360         if (tipc_mode == TIPC_NET_MODE)
 361                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 362                         " (cannot change network id once TIPC has joined a network)");
 363         tipc_net_id = value;
 364         return tipc_cfg_reply_none();
 365 }
 366
 367 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 368                                 int request_space, int reply_headroom)
 369 {
 370         struct sk_buff *rep_tlv_buf;
 371
 372         spin_lock_bh(&config_lock);
 373
 374         /* Save request and reply details in a well-known location */
 375
 376         req_tlv_area = request_area;
 377         req_tlv_space = request_space;
 378         rep_headroom = reply_headroom;
 379
 380         /* Check command authorization */
 381
 382         if (likely(orig_node == tipc_own_addr)) {
 383                 /* command is permitted */
 384         } else if (cmd >= 0x8000) {
 385                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 386                                                           " (cannot be done remotely)");
 387                 goto exit;
 388         } else if (!tipc_remote_management) {
 389                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 390                 goto exit;
 391         }
 392         else if (cmd >= 0x4000) {
 393                 u32 domain = 0;
 394
 395                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 396                     (domain != orig_node)) {
 397                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 398                         goto exit;
 399                 }
 400         }
 401
 402         /* Call appropriate processing routine */
 403
 404         switch (cmd) {
 405         case TIPC_CMD_NOOP:
 406                 rep_tlv_buf = tipc_cfg_reply_none();
 407                 break;
 408         case TIPC_CMD_GET_NODES:
 409                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 410                 break;
 411         case TIPC_CMD_GET_LINKS:
 412                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 413                 break;
 414         case TIPC_CMD_SHOW_LINK_STATS:
 415                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 416                 break;
 417         case TIPC_CMD_RESET_LINK_STATS:
 418                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 419                 break;
 420         case TIPC_CMD_SHOW_NAME_TABLE:
 421                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 422                 break;
 423         case TIPC_CMD_GET_BEARER_NAMES:
 424                 rep_tlv_buf = tipc_bearer_get_names();
 425                 break;
 426         case TIPC_CMD_GET_MEDIA_NAMES:
 427                 rep_tlv_buf = tipc_media_get_names();
 428                 break;
 429         case TIPC_CMD_SHOW_PORTS:
 430                 rep_tlv_buf = tipc_port_get_ports();
 431                 break;
 432         case TIPC_CMD_SET_LOG_SIZE:
 433                 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
 434                 break;
 435         case TIPC_CMD_DUMP_LOG:
 436                 rep_tlv_buf = tipc_log_dump();
 437                 break;
 438         case TIPC_CMD_SHOW_STATS:
 439                 rep_tlv_buf = tipc_show_stats();
 440                 break;
 441         case TIPC_CMD_SET_LINK_TOL:
 442         case TIPC_CMD_SET_LINK_PRI:
 443         case TIPC_CMD_SET_LINK_WINDOW:
 444                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 445                 break;
 446         case TIPC_CMD_ENABLE_BEARER:
 447                 rep_tlv_buf = cfg_enable_bearer();
 448                 break;
 449         case TIPC_CMD_DISABLE_BEARER:
 450                 rep_tlv_buf = cfg_disable_bearer();
 451                 break;
 452         case TIPC_CMD_SET_NODE_ADDR:
 453                 rep_tlv_buf = cfg_set_own_addr();
 454                 break;
 455         case TIPC_CMD_SET_REMOTE_MNG:
 456                 rep_tlv_buf = cfg_set_remote_mng();
 457                 break;
 458         case TIPC_CMD_SET_MAX_PORTS:
 459                 rep_tlv_buf = cfg_set_max_ports();
 460                 break;
 461         case TIPC_CMD_SET_MAX_PUBL:
 462                 rep_tlv_buf = cfg_set_max_publications();
 463                 break;
 464         case TIPC_CMD_SET_MAX_SUBSCR:
 465                 rep_tlv_buf = cfg_set_max_subscriptions();
 466                 break;
 467         case TIPC_CMD_SET_MAX_ZONES:
 468                 rep_tlv_buf = cfg_set_max_zones();
 469                 break;
 470         case TIPC_CMD_SET_MAX_CLUSTERS:
 471                 rep_tlv_buf = cfg_set_max_clusters();
 472                 break;
 473         case TIPC_CMD_SET_MAX_NODES:
 474                 rep_tlv_buf = cfg_set_max_nodes();
 475                 break;
 476         case TIPC_CMD_SET_MAX_SLAVES:
 477                 rep_tlv_buf = cfg_set_max_slaves();
 478                 break;
 479         case TIPC_CMD_SET_NETID:
 480                 rep_tlv_buf = cfg_set_netid();
 481                 break;
 482         case TIPC_CMD_GET_REMOTE_MNG:
 483                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 484                 break;
 485         case TIPC_CMD_GET_MAX_PORTS:
 486                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 487                 break;
 488         case TIPC_CMD_GET_MAX_PUBL:
 489                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 490                 break;
 491         case TIPC_CMD_GET_MAX_SUBSCR:
 492                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 493                 break;
 494         case TIPC_CMD_GET_MAX_ZONES:
 495                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
 496                 break;
 497         case TIPC_CMD_GET_MAX_CLUSTERS:
 498                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
 499                 break;
 500         case TIPC_CMD_GET_MAX_NODES:
 501                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
 502                 break;
 503         case TIPC_CMD_GET_MAX_SLAVES:
 504                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
 505                 break;
 506         case TIPC_CMD_GET_NETID:
 507                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 508                 break;
 509         case TIPC_CMD_NOT_NET_ADMIN:
 510                 rep_tlv_buf =
 511                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 512                 break;
 513         default:
 514                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 515                                                           " (unknown command)");
 516                 break;
 517         }
 518
 519         /* Return reply buffer */
 520 exit:
 521         spin_unlock_bh(&config_lock);
 522         return rep_tlv_buf;
 523 }
 524
 525 static void cfg_named_msg_event(void *userdata,
 526                                 u32 port_ref,
 527                                 struct sk_buff **buf,
 528                                 const unchar *msg,
 529                                 u32 size,
 530                                 u32 importance,
 531                                 struct tipc_portid const *orig,
 532                                 struct tipc_name_seq const *dest)
 533 {
 534         struct tipc_cfg_msg_hdr *req_hdr;
 535         struct tipc_cfg_msg_hdr *rep_hdr;
 536         struct sk_buff *rep_buf;
 537
 538         /* Validate configuration message header (ignore invalid message) */
 539
 540         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 541         if ((size < sizeof(*req_hdr)) ||
 542             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 543             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 544                 warn("Invalid configuration message discarded\n");
 545                 return;
 546         }
 547
 548         /* Generate reply for request (if can't, return request) */
 549
 550         rep_buf = tipc_cfg_do_cmd(orig->node,
 551                                   ntohs(req_hdr->tcm_type),
 552                                   msg + sizeof(*req_hdr),
 553                                   size - sizeof(*req_hdr),
 554                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 555         if (rep_buf) {
 556                 skb_push(rep_buf, sizeof(*rep_hdr));
 557                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 558                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 559                 rep_hdr->tcm_len = htonl(rep_buf->len);
 560                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 561         } else {
 562                 rep_buf = *buf;
 563                 *buf = NULL;
 564         }
 565
 566         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 567         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 568 }
 569
 570 int tipc_cfg_init(void)
 571 {
 572         struct tipc_name_seq seq;
 573         int res;
 574
 575         res = tipc_attach(&mng.user_ref, NULL, NULL);
 576         if (res)
 577                 goto failed;
 578
 579         res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
 580                               NULL, NULL, NULL,
 581                               NULL, cfg_named_msg_event, NULL,
 582                               NULL, &mng.port_ref);
 583         if (res)
 584                 goto failed;
 585
 586         seq.type = TIPC_CFG_SRV;
 587         seq.lower = seq.upper = tipc_own_addr;
 588         res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
 589         if (res)
 590                 goto failed;
 591
 592         return 0;
 593
 594 failed:
 595         err("Unable to create configuration service\n");
 596         tipc_detach(mng.user_ref);
 597         mng.user_ref = 0;
 598         return res;
 599 }
 600
 601 void tipc_cfg_stop(void)
 602 {
 603         if (mng.user_ref) {
 604                 tipc_detach(mng.user_ref);
 605                 mng.user_ref = 0;
 606         }
 607 }