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 temporarily release configuration spinlock while switching into
 188          * networking mode as it calls tipc_eth_media_start(), which may sleep.
 189          * Releasing the lock is harmless as other locally-issued configuration
 190          * commands won't occur until this one completes, and remotely-issued
 191          * configuration commands can't be received until a local configuration
 192          * command to enable the first bearer is received and processed.
 193          */
 194
 195         spin_unlock_bh(&config_lock);
 196         tipc_core_start_net(addr);
 197         spin_lock_bh(&config_lock);
 198         return tipc_cfg_reply_none();
 199 }
 200
 201 static struct sk_buff *cfg_set_remote_mng(void)
 202 {
 203         u32 value;
 204
 205         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 206                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 207
 208         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 209         tipc_remote_management = (value != 0);
 210         return tipc_cfg_reply_none();
 211 }
 212
 213 static struct sk_buff *cfg_set_max_publications(void)
 214 {
 215         u32 value;
 216
 217         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 218                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 219
 220         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 221         if (value != delimit(value, 1, 65535))
 222                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 223                                                    " (max publications must be 1-65535)");
 224         tipc_max_publications = value;
 225         return tipc_cfg_reply_none();
 226 }
 227
 228 static struct sk_buff *cfg_set_max_subscriptions(void)
 229 {
 230         u32 value;
 231
 232         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 233                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 234
 235         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 236         if (value != delimit(value, 1, 65535))
 237                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 238                                                    " (max subscriptions must be 1-65535");
 239         tipc_max_subscriptions = value;
 240         return tipc_cfg_reply_none();
 241 }
 242
 243 static struct sk_buff *cfg_set_max_ports(void)
 244 {
 245         u32 value;
 246
 247         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 248                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 249         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 250         if (value == tipc_max_ports)
 251                 return tipc_cfg_reply_none();
 252         if (value != delimit(value, 127, 65535))
 253                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 254                                                    " (max ports must be 127-65535)");
 255         if (tipc_mode != TIPC_NOT_RUNNING)
 256                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 257                         " (cannot change max ports while TIPC is active)");
 258         tipc_max_ports = value;
 259         return tipc_cfg_reply_none();
 260 }
 261
 262 static struct sk_buff *cfg_set_netid(void)
 263 {
 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         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 269         if (value == tipc_net_id)
 270                 return tipc_cfg_reply_none();
 271         if (value != delimit(value, 1, 9999))
 272                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 273                                                    " (network id must be 1-9999)");
 274         if (tipc_mode == TIPC_NET_MODE)
 275                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 276                         " (cannot change network id once TIPC has joined a network)");
 277         tipc_net_id = value;
 278         return tipc_cfg_reply_none();
 279 }
 280
 281 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 282                                 int request_space, int reply_headroom)
 283 {
 284         struct sk_buff *rep_tlv_buf;
 285
 286         spin_lock_bh(&config_lock);
 287
 288         /* Save request and reply details in a well-known location */
 289
 290         req_tlv_area = request_area;
 291         req_tlv_space = request_space;
 292         rep_headroom = reply_headroom;
 293
 294         /* Check command authorization */
 295
 296         if (likely(orig_node == tipc_own_addr)) {
 297                 /* command is permitted */
 298         } else if (cmd >= 0x8000) {
 299                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 300                                                           " (cannot be done remotely)");
 301                 goto exit;
 302         } else if (!tipc_remote_management) {
 303                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 304                 goto exit;
 305         } else if (cmd >= 0x4000) {
 306                 u32 domain = 0;
 307
 308                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 309                     (domain != orig_node)) {
 310                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 311                         goto exit;
 312                 }
 313         }
 314
 315         /* Call appropriate processing routine */
 316
 317         switch (cmd) {
 318         case TIPC_CMD_NOOP:
 319                 rep_tlv_buf = tipc_cfg_reply_none();
 320                 break;
 321         case TIPC_CMD_GET_NODES:
 322                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 323                 break;
 324         case TIPC_CMD_GET_LINKS:
 325                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 326                 break;
 327         case TIPC_CMD_SHOW_LINK_STATS:
 328                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 329                 break;
 330         case TIPC_CMD_RESET_LINK_STATS:
 331                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 332                 break;
 333         case TIPC_CMD_SHOW_NAME_TABLE:
 334                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 335                 break;
 336         case TIPC_CMD_GET_BEARER_NAMES:
 337                 rep_tlv_buf = tipc_bearer_get_names();
 338                 break;
 339         case TIPC_CMD_GET_MEDIA_NAMES:
 340                 rep_tlv_buf = tipc_media_get_names();
 341                 break;
 342         case TIPC_CMD_SHOW_PORTS:
 343                 rep_tlv_buf = tipc_port_get_ports();
 344                 break;
 345         case TIPC_CMD_SET_LOG_SIZE:
 346                 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
 347                 break;
 348         case TIPC_CMD_DUMP_LOG:
 349                 rep_tlv_buf = tipc_log_dump();
 350                 break;
 351         case TIPC_CMD_SHOW_STATS:
 352                 rep_tlv_buf = tipc_show_stats();
 353                 break;
 354         case TIPC_CMD_SET_LINK_TOL:
 355         case TIPC_CMD_SET_LINK_PRI:
 356         case TIPC_CMD_SET_LINK_WINDOW:
 357                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 358                 break;
 359         case TIPC_CMD_ENABLE_BEARER:
 360                 rep_tlv_buf = cfg_enable_bearer();
 361                 break;
 362         case TIPC_CMD_DISABLE_BEARER:
 363                 rep_tlv_buf = cfg_disable_bearer();
 364                 break;
 365         case TIPC_CMD_SET_NODE_ADDR:
 366                 rep_tlv_buf = cfg_set_own_addr();
 367                 break;
 368         case TIPC_CMD_SET_REMOTE_MNG:
 369                 rep_tlv_buf = cfg_set_remote_mng();
 370                 break;
 371         case TIPC_CMD_SET_MAX_PORTS:
 372                 rep_tlv_buf = cfg_set_max_ports();
 373                 break;
 374         case TIPC_CMD_SET_MAX_PUBL:
 375                 rep_tlv_buf = cfg_set_max_publications();
 376                 break;
 377         case TIPC_CMD_SET_MAX_SUBSCR:
 378                 rep_tlv_buf = cfg_set_max_subscriptions();
 379                 break;
 380         case TIPC_CMD_SET_NETID:
 381                 rep_tlv_buf = cfg_set_netid();
 382                 break;
 383         case TIPC_CMD_GET_REMOTE_MNG:
 384                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 385                 break;
 386         case TIPC_CMD_GET_MAX_PORTS:
 387                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 388                 break;
 389         case TIPC_CMD_GET_MAX_PUBL:
 390                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
 391                 break;
 392         case TIPC_CMD_GET_MAX_SUBSCR:
 393                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
 394                 break;
 395         case TIPC_CMD_GET_NETID:
 396                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 397                 break;
 398         case TIPC_CMD_NOT_NET_ADMIN:
 399                 rep_tlv_buf =
 400                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 401                 break;
 402         case TIPC_CMD_SET_MAX_ZONES:
 403         case TIPC_CMD_GET_MAX_ZONES:
 404         case TIPC_CMD_SET_MAX_SLAVES:
 405         case TIPC_CMD_GET_MAX_SLAVES:
 406         case TIPC_CMD_SET_MAX_CLUSTERS:
 407         case TIPC_CMD_GET_MAX_CLUSTERS:
 408         case TIPC_CMD_SET_MAX_NODES:
 409         case TIPC_CMD_GET_MAX_NODES:
 410                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 411                                                           " (obsolete command)");
 412                 break;
 413         default:
 414                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 415                                                           " (unknown command)");
 416                 break;
 417         }
 418
 419         /* Return reply buffer */
 420 exit:
 421         spin_unlock_bh(&config_lock);
 422         return rep_tlv_buf;
 423 }
 424
 425 static void cfg_named_msg_event(void *userdata,
 426                                 u32 port_ref,
 427                                 struct sk_buff **buf,
 428                                 const unchar *msg,
 429                                 u32 size,
 430                                 u32 importance,
 431                                 struct tipc_portid const *orig,
 432                                 struct tipc_name_seq const *dest)
 433 {
 434         struct tipc_cfg_msg_hdr *req_hdr;
 435         struct tipc_cfg_msg_hdr *rep_hdr;
 436         struct sk_buff *rep_buf;
 437
 438         /* Validate configuration message header (ignore invalid message) */
 439
 440         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
 441         if ((size < sizeof(*req_hdr)) ||
 442             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 443             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 444                 warn("Invalid configuration message discarded\n");
 445                 return;
 446         }
 447
 448         /* Generate reply for request (if can't, return request) */
 449
 450         rep_buf = tipc_cfg_do_cmd(orig->node,
 451                                   ntohs(req_hdr->tcm_type),
 452                                   msg + sizeof(*req_hdr),
 453                                   size - sizeof(*req_hdr),
 454                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 455         if (rep_buf) {
 456                 skb_push(rep_buf, sizeof(*rep_hdr));
 457                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 458                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 459                 rep_hdr->tcm_len = htonl(rep_buf->len);
 460                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 461         } else {
 462                 rep_buf = *buf;
 463                 *buf = NULL;
 464         }
 465
 466         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
 467         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
 468 }
 469
 470 int tipc_cfg_init(void)
 471 {
 472         struct tipc_name_seq seq;
 473         int res;
 474
 475         res = tipc_createport(NULL, TIPC_CRITICAL_IMPORTANCE,
 476                               NULL, NULL, NULL,
 477                               NULL, cfg_named_msg_event, NULL,
 478                               NULL, &config_port_ref);
 479         if (res)
 480                 goto failed;
 481
 482         seq.type = TIPC_CFG_SRV;
 483         seq.lower = seq.upper = tipc_own_addr;
 484         res = tipc_nametbl_publish_rsv(config_port_ref, TIPC_ZONE_SCOPE, &seq);
 485         if (res)
 486                 goto failed;
 487
 488         return 0;
 489
 490 failed:
 491         err("Unable to create configuration service\n");
 492         return res;
 493 }
 494
 495 void tipc_cfg_stop(void)
 496 {
 497         if (config_port_ref) {
 498                 tipc_deleteport(config_port_ref);
 499                 config_port_ref = 0;
 500         }
 501 }