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, 2010-2011, 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 "name_table.h"
  40 #include "config.h"
  41
  42 static u32 config_port_ref;
  43
  44 static DEFINE_SPINLOCK(config_lock);
  45
  46 static const void *req_tlv_area;        /* request message TLV area */
  47 static int req_tlv_space;               /* request message TLV area size */
  48 static int rep_headroom;                /* reply message headroom to use */
  49
  50
  51 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
  52 {
  53         struct sk_buff *buf;
  54
  55         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
  56         if (buf)
  57                 skb_reserve(buf, rep_headroom);
  58         return buf;
  59 }
  60
  61 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
  62                         void *tlv_data, int tlv_data_size)
  63 {
  64         struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
  65         int new_tlv_space = TLV_SPACE(tlv_data_size);
  66
  67         if (skb_tailroom(buf) < new_tlv_space)
  68                 return 0;
  69         skb_put(buf, new_tlv_space);
  70         tlv->tlv_type = htons(tlv_type);
  71         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
  72         if (tlv_data_size && tlv_data)
  73                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
  74         return 1;
  75 }
  76
  77 static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
  78 {
  79         struct sk_buff *buf;
  80         __be32 value_net;
  81
  82         buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
  83         if (buf) {
  84                 value_net = htonl(value);
  85                 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
  86                                     sizeof(value_net));
  87         }
  88         return buf;
  89 }
  90
  91 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
  92 {
  93         return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
  94 }
  95
  96 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
  97 {
  98         struct sk_buff *buf;
  99         int string_len = strlen(string) + 1;
 100
 101         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
 102         if (buf)
 103                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
 104         return buf;
 105 }
 106
 107 #define MAX_STATS_INFO 2000
 108
 109 static struct sk_buff *tipc_show_stats(void)
 110 {
 111         struct sk_buff *buf;
 112         struct tlv_desc *rep_tlv;
 113         struct print_buf pb;
 114         int str_len;
 115         u32 value;
 116
 117         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 118                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 119
 120         value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
 121         if (value != 0)
 122                 return tipc_cfg_reply_error_string("unsupported argument");
 123
 124         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));
 125         if (buf == NULL)
 126                 return NULL;
 127
 128         rep_tlv = (struct tlv_desc *)buf->data;
 129         tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);
 130
 131         tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "\n");
 132
 133         /* Use additional tipc_printf()'s to return more info ... */
 134
 135         str_len = tipc_printbuf_validate(&pb);
 136         skb_put(buf, TLV_SPACE(str_len));
 137         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 138
 139         return buf;
 140 }
 141
 142 static struct sk_buff *cfg_enable_bearer(void)
 143 {
 144         struct tipc_bearer_config *args;
 145
 146         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 147                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 148
 149         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 150         if (tipc_enable_bearer(args->name,
 151                                ntohl(args->disc_domain),
 152                                ntohl(args->priority)))
 153                 return tipc_cfg_reply_error_string("unable to enable bearer");
 154
 155         return tipc_cfg_reply_none();
 156 }
 157
 158 static struct sk_buff *cfg_disable_bearer(void)
 159 {
 160         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 161                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 162
 163         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 164                 return tipc_cfg_reply_error_string("unable to disable bearer");
 165
 166         return tipc_cfg_reply_none();
 167 }
 168
 169 static struct sk_buff *cfg_set_own_addr(void)
 170 {
 171         u32 addr;
 172
 173         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 174                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 175
 176         addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 177         if (addr == tipc_own_addr)
 178                 return tipc_cfg_reply_none();
 179         if (!tipc_addr_node_valid(addr))
 180                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 181                                                    " (node address)");
 182         if (tipc_mode == TIPC_NET_MODE)
 183                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 184                                                    " (cannot change node address once assigned)");
 185
 186         /*
 187          * Must release all spinlocks before calling start_net() because
 188          * Linux version of TIPC calls eth_media_start() which calls
 189          * register_netdevice_notifier() which may block!
 190          *
 191          * Temporarily releasing the lock should be harmless for non-Linux TIPC,
 192          * but Linux version of eth_media_start() should really be reworked
 193          * so that it can be called with spinlocks held.
 194          */
 195
 196         spin_unlock_bh(&config_lock);
 197         tipc_core_start_net(addr);
 198         spin_lock_bh(&config_lock);
 199         return tipc_cfg_reply_none();
 200 }
 201
 202 static struct sk_buff *cfg_set_remote_mng(void)
 203 {
 204         u32 value;
 205
 206         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 207                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 208
 209         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 210         tipc_remote_management = (value != 0);
 211         return tipc_cfg_reply_none();
 212 }
 213
 214 static struct sk_buff *cfg_set_max_publications(void)
 215 {
 216         u32 value;
 217
 218         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 219                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 220
 221         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 222         if (value != delimit(value, 1, 65535))
 223                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 224                                                    " (max publications must be 1-65535)");
 225         tipc_max_publications = value;
 226         return tipc_cfg_reply_none();
 227 }
 228
 229 static struct sk_buff *cfg_set_max_subscriptions(void)
 230 {
 231         u32 value;
 232
 233         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 234                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 235
 236         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 237         if (value != delimit(value, 1, 65535))
 238                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 239                                                    " (max subscriptions must be 1-65535");
 240         tipc_max_subscriptions = value;
 241         return tipc_cfg_reply_none();
 242 }
 243
 244 static struct sk_buff *cfg_set_max_ports(void)
 245 {
 246         u32 value;
 247
 248         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 249                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 250         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 251         if (value == tipc_max_ports)
 252                 return tipc_cfg_reply_none();
 253         if (value != delimit(value, 127, 65535))
 254                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 255                                                    " (max ports must be 127-65535)");
 256         if (tipc_mode != TIPC_NOT_RUNNING)
 257                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 258                         " (cannot change max ports while TIPC is active)");
 259         tipc_max_ports = value;
 260         return tipc_cfg_reply_none();
 261 }
 262
 263 static struct sk_buff *cfg_set_netid(void)
 264 {
 265         u32 value;
 266
 267         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 268                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 269         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 270         if (value == tipc_net_id)
 271                 return tipc_cfg_reply_none();
 272         if (value != delimit(value, 1, 9999))
 273                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 274                                                    " (network id must be 1-9999)");
 275         if (tipc_mode == TIPC_NET_MODE)
 276                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 277                         " (cannot change network id once TIPC has joined a network)");
 278         tipc_net_id = value;
 279         return tipc_cfg_reply_none();
 280 }
 281
 282 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 283                                 int request_space, int reply_headroom)
 284 {
 285         struct sk_buff *rep_tlv_buf;
 286
 287         spin_lock_bh(&config_lock);
 288
 289         /* Save request and reply details in a well-known location */
 290
 291         req_tlv_area = request_area;
 292         req_tlv_space = request_space;
 293         rep_headroom = reply_headroom;
 294
 295         /* Check command authorization */
 296
 297         if (likely(orig_node == tipc_own_addr)) {
 298                 /* command is permitted */
 299         } else if (cmd >= 0x8000) {
 300                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 301                                                           " (cannot be done remotely)");
 302                 goto exit;
 303         } else if (!tipc_remote_management) {
 304                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 305                 goto exit;
 306         } else if (cmd >= 0x4000) {
 307                 u32 domain = 0;
 308
 309                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 310                     (domain != orig_node)) {
 311                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 312                         goto exit;
 313                 }
 314         }
 315
 316         /* Call appropriate processing routine */
 317
 318         switch (cmd) {
 319         case TIPC_CMD_NOOP:
 320                 rep_tlv_buf = tipc_cfg_reply_none();
 321                 break;
 322         case TIPC_CMD_GET_NODES:
 323                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 324                 break;
 325         case TIPC_CMD_GET_LINKS:
 326                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 327                 break;
 328         case TIPC_CMD_SHOW_LINK_STATS:
 329                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 330                 break;
 331         case TIPC_CMD_RESET_LINK_STATS:
 332                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 333                 break;
 334         case TIPC_CMD_SHOW_NAME_TABLE:
 335                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 336                 break;
 337         case TIPC_CMD_GET_BEARER_NAMES:
 338                 rep_tlv_buf = tipc_bearer_get_names();
 339                 break;
 340         case TIPC_CMD_GET_MEDIA_NAMES:
 341                 rep_tlv_buf = tipc_media_get_names();
 342                 break;
 343         case TIPC_CMD_SHOW_PORTS:
 344                 rep_tlv_buf = tipc_port_get_ports();
 345                 break;
 346         case TIPC_CMD_SET_LOG_SIZE:
 347                 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
 348                 break;
 349         case TIPC_CMD_DUMP_LOG:
 350                 rep_tlv_buf = tipc_log_dump();
 351                 break;
 352         case TIPC_CMD_SHOW_STATS:
 353                 rep_tlv_buf = tipc_show_stats();
 354                 break;
 355         case TIPC_CMD_SET_LINK_TOL:
 356         case TIPC_CMD_SET_LINK_PRI:
 357         case TIPC_CMD_SET_LINK_WINDOW:
 358                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 359                 break;
 360         case TIPC_CMD_ENABLE_BEARER:
 361                 rep_tlv_buf = cfg_enable_bearer();
 362                 break;
 363         case TIPC_CMD_DISABLE_BEARER:
 364                 rep_tlv_buf = cfg_disable_bearer();
 365                 break;
 366         case TIPC_CMD_SET_NODE_ADDR:
 367                 rep_tlv_buf = cfg_set_own_addr();
 368                 break;
 369         case TIPC_CMD_SET_REMOTE_MNG:
 370                 rep_tlv_buf = cfg_set_remote_mng();
 371                 break;
 372         case TIPC_CMD_SET_MAX_PORTS:
 373                 rep_tlv_buf = cfg_set_max_ports();
 374                 break;
 375         case TIPC_CMD_SET_MAX_PUBL:
 376                 rep_tlv_buf = cfg_set_max_publications();
 377                 break;
 378         case TIPC_CMD_SET_MAX_SUBSCR:
 379                 rep_tlv_buf = cfg_set_max_subscriptions();
 380                 break;
 381         case TIPC_CMD_SET_NETID:
 382                 rep_tlv_buf = cfg_set_netid();
 383                 break;
 384         case TIPC_CMD_GET_REMOTE_MNG:
 385                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 386                 break;
 387         case TIPC_CMD_GET_MAX_PORTS:
 388                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 389                 break;
 390         case TIPC_CMD_GET_MAX_PUBL:
 391                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 392                 break;
 393         case TIPC_CMD_GET_MAX_SUBSCR:
 394                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 395                 break;
 396         case TIPC_CMD_GET_NETID:
 397                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 398                 break;
 399         case TIPC_CMD_NOT_NET_ADMIN:
 400                 rep_tlv_buf =
 401                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 402                 break;
 403         case TIPC_CMD_SET_MAX_ZONES:
 404         case TIPC_CMD_GET_MAX_ZONES:
 405         case TIPC_CMD_SET_MAX_SLAVES:
 406         case TIPC_CMD_GET_MAX_SLAVES:
 407         case TIPC_CMD_SET_MAX_CLUSTERS:
 408         case TIPC_CMD_GET_MAX_CLUSTERS:
 409         case TIPC_CMD_SET_MAX_NODES:
 410         case TIPC_CMD_GET_MAX_NODES:
 411                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 412                                                           " (obsolete command)");
 413                 break;
 414         default:
 415                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 416                                                           " (unknown command)");
 417                 break;
 418         }
 419
 420         /* Return reply buffer */
 421 exit:
 422         spin_unlock_bh(&config_lock);
 423         return rep_tlv_buf;
 424 }
 425
 426 static void cfg_named_msg_event(void *userdata,
 427                                 u32 port_ref,
 428                                 struct sk_buff **buf,
 429                                 const unchar *msg,
 430                                 u32 size,
 431                                 u32 importance,
 432                                 struct tipc_portid const *orig,
 433                                 struct tipc_name_seq const *dest)
 434 {
 435         struct tipc_cfg_msg_hdr *req_hdr;
 436         struct tipc_cfg_msg_hdr *rep_hdr;
 437         struct sk_buff *rep_buf;
 438
 439         /* Validate configuration message header (ignore invalid message) */
 440
 441         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 442         if ((size < sizeof(*req_hdr)) ||
 443             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 444             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 445                 warn("Invalid configuration message discarded\n");
 446                 return;
 447         }
 448
 449         /* Generate reply for request (if can't, return request) */
 450
 451         rep_buf = tipc_cfg_do_cmd(orig->node,
 452                                   ntohs(req_hdr->tcm_type),
 453                                   msg + sizeof(*req_hdr),
 454                                   size - sizeof(*req_hdr),
 455                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 456         if (rep_buf) {
 457                 skb_push(rep_buf, sizeof(*rep_hdr));
 458                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 459                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 460                 rep_hdr->tcm_len = htonl(rep_buf->len);
 461                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 462         } else {
 463                 rep_buf = *buf;
 464                 *buf = NULL;
 465         }
 466
 467         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 468         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 469 }
 470
 471 int tipc_cfg_init(void)
 472 {
 473         struct tipc_name_seq seq;
 474         int res;
 475
 476         res = tipc_createport(NULL, TIPC_CRITICAL_IMPORTANCE,
 477                               NULL, NULL, NULL,
 478                               NULL, cfg_named_msg_event, NULL,
 479                               NULL, &config_port_ref);
 480         if (res)
 481                 goto failed;
 482
 483         seq.type = TIPC_CFG_SRV;
 484         seq.lower = seq.upper = tipc_own_addr;
 485         res = tipc_nametbl_publish_rsv(config_port_ref, TIPC_ZONE_SCOPE, &seq);
 486         if (res)
 487                 goto failed;
 488
 489         return 0;
 490
 491 failed:
 492         err("Unable to create configuration service\n");
 493         return res;
 494 }
 495
 496 void tipc_cfg_stop(void)
 497 {
 498         if (config_port_ref) {
 499                 tipc_deleteport(config_port_ref);
 500                 config_port_ref = 0;
 501         }
 502 }