linux/net/tipc/config.c
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   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
  49struct subscr_data {
  50        char usr_handle[8];
  51        u32 domain;
  52        u32 port_ref;
  53        struct list_head subd_list;
  54};
  55
  56struct manager {
  57        u32 user_ref;
  58        u32 port_ref;
  59};
  60
  61static struct manager mng = { 0};
  62
  63static DEFINE_SPINLOCK(config_lock);
  64
  65static const void *req_tlv_area;        /* request message TLV area */
  66static int req_tlv_space;               /* request message TLV area size */
  67static int rep_headroom;                /* reply message headroom to use */
  68
  69
  70struct 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
  80int 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
  98struct 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
 112struct 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
 137void tipc_cfg_link_event(u32 addr, char *name, int up)
 138{
 139        /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
 140}
 141
 142int 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
 186static 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        }
 249exit:
 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
 258static 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
 291static 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
 307static 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
 318static 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
 351static 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
 363static 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
 378static 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
 393static 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
 412static 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
 431static 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
 444static 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
 463static 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
 476static 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
 495struct 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 */
 656exit:
 657        spin_unlock_bh(&config_lock);
 658        return rep_tlv_buf;
 659}
 660
 661static 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
 706int 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
 730failed:
 731        err("Unable to create configuration service\n");
 732        tipc_detach(mng.user_ref);
 733        mng.user_ref = 0;
 734        return res;
 735}
 736
 737void tipc_cfg_stop(void)
 738{
 739        if (mng.user_ref) {
 740                tipc_detach(mng.user_ref);
 741                mng.user_ref = 0;
 742        }
 743}
 744