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, 2010-2013, 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 #include "server.h"
  42
  43 #define REPLY_TRUNCATED "<truncated>\n"
  44
  45 static DEFINE_MUTEX(config_mutex);
  46 static struct tipc_server cfgsrv;
  47
  48 static const void *req_tlv_area;        /* request message TLV area */
  49 static int req_tlv_space;               /* request message TLV area size */
  50 static int rep_headroom;                /* reply message headroom to use */
  51
  52
  53 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
  54 {
  55         struct sk_buff *buf;
  56
  57         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
  58         if (buf)
  59                 skb_reserve(buf, rep_headroom);
  60         return buf;
  61 }
  62
  63 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
  64                         void *tlv_data, int tlv_data_size)
  65 {
  66         struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
  67         int new_tlv_space = TLV_SPACE(tlv_data_size);
  68
  69         if (skb_tailroom(buf) < new_tlv_space)
  70                 return 0;
  71         skb_put(buf, new_tlv_space);
  72         tlv->tlv_type = htons(tlv_type);
  73         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
  74         if (tlv_data_size && tlv_data)
  75                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
  76         return 1;
  77 }
  78
  79 static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
  80 {
  81         struct sk_buff *buf;
  82         __be32 value_net;
  83
  84         buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
  85         if (buf) {
  86                 value_net = htonl(value);
  87                 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
  88                                     sizeof(value_net));
  89         }
  90         return buf;
  91 }
  92
  93 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
  94 {
  95         return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
  96 }
  97
  98 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
  99 {
 100         struct sk_buff *buf;
 101         int string_len = strlen(string) + 1;
 102
 103         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
 104         if (buf)
 105                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
 106         return buf;
 107 }
 108
 109 static struct sk_buff *tipc_show_stats(void)
 110 {
 111         struct sk_buff *buf;
 112         struct tlv_desc *rep_tlv;
 113         char *pb;
 114         int pb_len;
 115         int str_len;
 116         u32 value;
 117
 118         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 119                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 120
 121         value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
 122         if (value != 0)
 123                 return tipc_cfg_reply_error_string("unsupported argument");
 124
 125         buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
 126         if (buf == NULL)
 127                 return NULL;
 128
 129         rep_tlv = (struct tlv_desc *)buf->data;
 130         pb = TLV_DATA(rep_tlv);
 131         pb_len = ULTRA_STRING_MAX_LEN;
 132
 133         str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "\n");
 134         str_len += 1;   /* for "\0" */
 135         skb_put(buf, TLV_SPACE(str_len));
 136         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 137
 138         return buf;
 139 }
 140
 141 static struct sk_buff *cfg_enable_bearer(void)
 142 {
 143         struct tipc_bearer_config *args;
 144
 145         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 146                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 147
 148         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 149         if (tipc_enable_bearer(args->name,
 150                                ntohl(args->disc_domain),
 151                                ntohl(args->priority)))
 152                 return tipc_cfg_reply_error_string("unable to enable bearer");
 153
 154         return tipc_cfg_reply_none();
 155 }
 156
 157 static struct sk_buff *cfg_disable_bearer(void)
 158 {
 159         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 160                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 161
 162         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 163                 return tipc_cfg_reply_error_string("unable to disable bearer");
 164
 165         return tipc_cfg_reply_none();
 166 }
 167
 168 static struct sk_buff *cfg_set_own_addr(void)
 169 {
 170         u32 addr;
 171
 172         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 173                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 174
 175         addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 176         if (addr == tipc_own_addr)
 177                 return tipc_cfg_reply_none();
 178         if (!tipc_addr_node_valid(addr))
 179                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 180                                                    " (node address)");
 181         if (tipc_own_addr)
 182                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 183                                                    " (cannot change node address once assigned)");
 184         tipc_core_start_net(addr);
 185         return tipc_cfg_reply_none();
 186 }
 187
 188 static struct sk_buff *cfg_set_remote_mng(void)
 189 {
 190         u32 value;
 191
 192         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 193                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 194
 195         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 196         tipc_remote_management = (value != 0);
 197         return tipc_cfg_reply_none();
 198 }
 199
 200 static struct sk_buff *cfg_set_max_ports(void)
 201 {
 202         u32 value;
 203
 204         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 205                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 206         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 207         if (value == tipc_max_ports)
 208                 return tipc_cfg_reply_none();
 209         if (value < 127 || value > 65535)
 210                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 211                                                    " (max ports must be 127-65535)");
 212         return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 213                 " (cannot change max ports while TIPC is active)");
 214 }
 215
 216 static struct sk_buff *cfg_set_netid(void)
 217 {
 218         u32 value;
 219
 220         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 221                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 222         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 223         if (value == tipc_net_id)
 224                 return tipc_cfg_reply_none();
 225         if (value < 1 || value > 9999)
 226                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 227                                                    " (network id must be 1-9999)");
 228         if (tipc_own_addr)
 229                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 230                         " (cannot change network id once TIPC has joined a network)");
 231         tipc_net_id = value;
 232         return tipc_cfg_reply_none();
 233 }
 234
 235 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 236                                 int request_space, int reply_headroom)
 237 {
 238         struct sk_buff *rep_tlv_buf;
 239
 240         mutex_lock(&config_mutex);
 241
 242         /* Save request and reply details in a well-known location */
 243         req_tlv_area = request_area;
 244         req_tlv_space = request_space;
 245         rep_headroom = reply_headroom;
 246
 247         /* Check command authorization */
 248         if (likely(in_own_node(orig_node))) {
 249                 /* command is permitted */
 250         } else if (cmd >= 0x8000) {
 251                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 252                                                           " (cannot be done remotely)");
 253                 goto exit;
 254         } else if (!tipc_remote_management) {
 255                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
 256                 goto exit;
 257         } else if (cmd >= 0x4000) {
 258                 u32 domain = 0;
 259
 260                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
 261                     (domain != orig_node)) {
 262                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
 263                         goto exit;
 264                 }
 265         }
 266
 267         /* Call appropriate processing routine */
 268         switch (cmd) {
 269         case TIPC_CMD_NOOP:
 270                 rep_tlv_buf = tipc_cfg_reply_none();
 271                 break;
 272         case TIPC_CMD_GET_NODES:
 273                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 274                 break;
 275         case TIPC_CMD_GET_LINKS:
 276                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 277                 break;
 278         case TIPC_CMD_SHOW_LINK_STATS:
 279                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 280                 break;
 281         case TIPC_CMD_RESET_LINK_STATS:
 282                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 283                 break;
 284         case TIPC_CMD_SHOW_NAME_TABLE:
 285                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 286                 break;
 287         case TIPC_CMD_GET_BEARER_NAMES:
 288                 rep_tlv_buf = tipc_bearer_get_names();
 289                 break;
 290         case TIPC_CMD_GET_MEDIA_NAMES:
 291                 rep_tlv_buf = tipc_media_get_names();
 292                 break;
 293         case TIPC_CMD_SHOW_PORTS:
 294                 rep_tlv_buf = tipc_port_get_ports();
 295                 break;
 296         case TIPC_CMD_SHOW_STATS:
 297                 rep_tlv_buf = tipc_show_stats();
 298                 break;
 299         case TIPC_CMD_SET_LINK_TOL:
 300         case TIPC_CMD_SET_LINK_PRI:
 301         case TIPC_CMD_SET_LINK_WINDOW:
 302                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 303                 break;
 304         case TIPC_CMD_ENABLE_BEARER:
 305                 rep_tlv_buf = cfg_enable_bearer();
 306                 break;
 307         case TIPC_CMD_DISABLE_BEARER:
 308                 rep_tlv_buf = cfg_disable_bearer();
 309                 break;
 310         case TIPC_CMD_SET_NODE_ADDR:
 311                 rep_tlv_buf = cfg_set_own_addr();
 312                 break;
 313         case TIPC_CMD_SET_REMOTE_MNG:
 314                 rep_tlv_buf = cfg_set_remote_mng();
 315                 break;
 316         case TIPC_CMD_SET_MAX_PORTS:
 317                 rep_tlv_buf = cfg_set_max_ports();
 318                 break;
 319         case TIPC_CMD_SET_NETID:
 320                 rep_tlv_buf = cfg_set_netid();
 321                 break;
 322         case TIPC_CMD_GET_REMOTE_MNG:
 323                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
 324                 break;
 325         case TIPC_CMD_GET_MAX_PORTS:
 326                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
 327                 break;
 328         case TIPC_CMD_GET_NETID:
 329                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 330                 break;
 331         case TIPC_CMD_NOT_NET_ADMIN:
 332                 rep_tlv_buf =
 333                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 334                 break;
 335         case TIPC_CMD_SET_MAX_ZONES:
 336         case TIPC_CMD_GET_MAX_ZONES:
 337         case TIPC_CMD_SET_MAX_SLAVES:
 338         case TIPC_CMD_GET_MAX_SLAVES:
 339         case TIPC_CMD_SET_MAX_CLUSTERS:
 340         case TIPC_CMD_GET_MAX_CLUSTERS:
 341         case TIPC_CMD_SET_MAX_NODES:
 342         case TIPC_CMD_GET_MAX_NODES:
 343         case TIPC_CMD_SET_MAX_SUBSCR:
 344         case TIPC_CMD_GET_MAX_SUBSCR:
 345         case TIPC_CMD_SET_MAX_PUBL:
 346         case TIPC_CMD_GET_MAX_PUBL:
 347         case TIPC_CMD_SET_LOG_SIZE:
 348         case TIPC_CMD_DUMP_LOG:
 349                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 350                                                           " (obsolete command)");
 351                 break;
 352         default:
 353                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 354                                                           " (unknown command)");
 355                 break;
 356         }
 357
 358         WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));
 359
 360         /* Append an error message if we cannot return all requested data */
 361         if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
 362                 if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
 363                         sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
 364                                 sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
 365         }
 366
 367         /* Return reply buffer */
 368 exit:
 369         mutex_unlock(&config_mutex);
 370         return rep_tlv_buf;
 371 }
 372
 373 static void cfg_conn_msg_event(int conid, struct sockaddr_tipc *addr,
 374                                void *usr_data, void *buf, size_t len)
 375 {
 376         struct tipc_cfg_msg_hdr *req_hdr;
 377         struct tipc_cfg_msg_hdr *rep_hdr;
 378         struct sk_buff *rep_buf;
 379         int ret;
 380
 381         /* Validate configuration message header (ignore invalid message) */
 382         req_hdr = (struct tipc_cfg_msg_hdr *)buf;
 383         if ((len < sizeof(*req_hdr)) ||
 384             (len != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
 385             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
 386                 pr_warn("Invalid configuration message discarded\n");
 387                 return;
 388         }
 389
 390         /* Generate reply for request (if can't, return request) */
 391         rep_buf = tipc_cfg_do_cmd(addr->addr.id.node, ntohs(req_hdr->tcm_type),
 392                                   buf + sizeof(*req_hdr),
 393                                   len - sizeof(*req_hdr),
 394                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
 395         if (rep_buf) {
 396                 skb_push(rep_buf, sizeof(*rep_hdr));
 397                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
 398                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
 399                 rep_hdr->tcm_len = htonl(rep_buf->len);
 400                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
 401
 402                 ret = tipc_conn_sendmsg(&cfgsrv, conid, addr, rep_buf->data,
 403                                         rep_buf->len);
 404                 if (ret < 0)
 405                         pr_err("Sending cfg reply message failed, no memory\n");
 406
 407                 kfree_skb(rep_buf);
 408         }
 409 }
 410
 411 static struct sockaddr_tipc cfgsrv_addr __read_mostly = {
 412         .family                 = AF_TIPC,
 413         .addrtype               = TIPC_ADDR_NAMESEQ,
 414         .addr.nameseq.type      = TIPC_CFG_SRV,
 415         .addr.nameseq.lower     = 0,
 416         .addr.nameseq.upper     = 0,
 417         .scope                  = TIPC_ZONE_SCOPE
 418 };
 419
 420 static struct tipc_server cfgsrv __read_mostly = {
 421         .saddr                  = &cfgsrv_addr,
 422         .imp                    = TIPC_CRITICAL_IMPORTANCE,
 423         .type                   = SOCK_RDM,
 424         .max_rcvbuf_size        = 64 * 1024,
 425         .name                   = "cfg_server",
 426         .tipc_conn_recvmsg      = cfg_conn_msg_event,
 427         .tipc_conn_new          = NULL,
 428         .tipc_conn_shutdown     = NULL
 429 };
 430
 431 int tipc_cfg_init(void)
 432 {
 433         return tipc_server_start(&cfgsrv);
 434 }
 435
 436 void tipc_cfg_reinit(void)
 437 {
 438         tipc_server_stop(&cfgsrv);
 439
 440         cfgsrv_addr.addr.nameseq.lower = tipc_own_addr;
 441         cfgsrv_addr.addr.nameseq.upper = tipc_own_addr;
 442         tipc_server_start(&cfgsrv);
 443 }
 444
 445 void tipc_cfg_stop(void)
 446 {
 447         tipc_server_stop(&cfgsrv);
 448 }