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 "socket.h"
  39 #include "name_table.h"
  40 #include "config.h"
  41 #include "server.h"
  42
  43 #define REPLY_TRUNCATED "<truncated>\n"
  44
  45 static const void *req_tlv_area;        /* request message TLV area */
  46 static int req_tlv_space;               /* request message TLV area size */
  47 static int rep_headroom;                /* reply message headroom to use */
  48
  49 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
  50 {
  51         struct sk_buff *buf;
  52
  53         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
  54         if (buf)
  55                 skb_reserve(buf, rep_headroom);
  56         return buf;
  57 }
  58
  59 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
  60                         void *tlv_data, int tlv_data_size)
  61 {
  62         struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
  63         int new_tlv_space = TLV_SPACE(tlv_data_size);
  64
  65         if (skb_tailroom(buf) < new_tlv_space)
  66                 return 0;
  67         skb_put(buf, new_tlv_space);
  68         tlv->tlv_type = htons(tlv_type);
  69         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
  70         if (tlv_data_size && tlv_data)
  71                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
  72         return 1;
  73 }
  74
  75 static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
  76 {
  77         struct sk_buff *buf;
  78         __be32 value_net;
  79
  80         buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
  81         if (buf) {
  82                 value_net = htonl(value);
  83                 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
  84                                     sizeof(value_net));
  85         }
  86         return buf;
  87 }
  88
  89 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
  90 {
  91         return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
  92 }
  93
  94 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
  95 {
  96         struct sk_buff *buf;
  97         int string_len = strlen(string) + 1;
  98
  99         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
 100         if (buf)
 101                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
 102         return buf;
 103 }
 104
 105 static struct sk_buff *tipc_show_stats(void)
 106 {
 107         struct sk_buff *buf;
 108         struct tlv_desc *rep_tlv;
 109         char *pb;
 110         int pb_len;
 111         int str_len;
 112         u32 value;
 113
 114         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 115                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 116
 117         value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
 118         if (value != 0)
 119                 return tipc_cfg_reply_error_string("unsupported argument");
 120
 121         buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
 122         if (buf == NULL)
 123                 return NULL;
 124
 125         rep_tlv = (struct tlv_desc *)buf->data;
 126         pb = TLV_DATA(rep_tlv);
 127         pb_len = ULTRA_STRING_MAX_LEN;
 128
 129         str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "\n");
 130         str_len += 1;   /* for "\0" */
 131         skb_put(buf, TLV_SPACE(str_len));
 132         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
 133
 134         return buf;
 135 }
 136
 137 static struct sk_buff *cfg_enable_bearer(void)
 138 {
 139         struct tipc_bearer_config *args;
 140
 141         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
 142                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 143
 144         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
 145         if (tipc_enable_bearer(args->name,
 146                                ntohl(args->disc_domain),
 147                                ntohl(args->priority)))
 148                 return tipc_cfg_reply_error_string("unable to enable bearer");
 149
 150         return tipc_cfg_reply_none();
 151 }
 152
 153 static struct sk_buff *cfg_disable_bearer(void)
 154 {
 155         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
 156                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 157
 158         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
 159                 return tipc_cfg_reply_error_string("unable to disable bearer");
 160
 161         return tipc_cfg_reply_none();
 162 }
 163
 164 static struct sk_buff *cfg_set_own_addr(void)
 165 {
 166         u32 addr;
 167
 168         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
 169                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 170
 171         addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 172         if (addr == tipc_own_addr)
 173                 return tipc_cfg_reply_none();
 174         if (!tipc_addr_node_valid(addr))
 175                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 176                                                    " (node address)");
 177         if (tipc_own_addr)
 178                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 179                                                    " (cannot change node address once assigned)");
 180         if (!tipc_net_start(addr))
 181                 return tipc_cfg_reply_none();
 182
 183         return tipc_cfg_reply_error_string("cannot change to network mode");
 184 }
 185
 186 static struct sk_buff *cfg_set_netid(void)
 187 {
 188         u32 value;
 189
 190         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
 191                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
 192         value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
 193         if (value == tipc_net_id)
 194                 return tipc_cfg_reply_none();
 195         if (value < 1 || value > 9999)
 196                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
 197                                                    " (network id must be 1-9999)");
 198         if (tipc_own_addr)
 199                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 200                         " (cannot change network id once TIPC has joined a network)");
 201         tipc_net_id = value;
 202         return tipc_cfg_reply_none();
 203 }
 204
 205 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
 206                                 int request_space, int reply_headroom)
 207 {
 208         struct sk_buff *rep_tlv_buf;
 209
 210         rtnl_lock();
 211
 212         /* Save request and reply details in a well-known location */
 213         req_tlv_area = request_area;
 214         req_tlv_space = request_space;
 215         rep_headroom = reply_headroom;
 216
 217         /* Check command authorization */
 218         if (likely(in_own_node(orig_node))) {
 219                 /* command is permitted */
 220         } else {
 221                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 222                                                           " (cannot be done remotely)");
 223                 goto exit;
 224         }
 225
 226         /* Call appropriate processing routine */
 227         switch (cmd) {
 228         case TIPC_CMD_NOOP:
 229                 rep_tlv_buf = tipc_cfg_reply_none();
 230                 break;
 231         case TIPC_CMD_GET_NODES:
 232                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
 233                 break;
 234         case TIPC_CMD_GET_LINKS:
 235                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
 236                 break;
 237         case TIPC_CMD_SHOW_LINK_STATS:
 238                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
 239                 break;
 240         case TIPC_CMD_RESET_LINK_STATS:
 241                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
 242                 break;
 243         case TIPC_CMD_SHOW_NAME_TABLE:
 244                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
 245                 break;
 246         case TIPC_CMD_GET_BEARER_NAMES:
 247                 rep_tlv_buf = tipc_bearer_get_names();
 248                 break;
 249         case TIPC_CMD_GET_MEDIA_NAMES:
 250                 rep_tlv_buf = tipc_media_get_names();
 251                 break;
 252         case TIPC_CMD_SHOW_PORTS:
 253                 rep_tlv_buf = tipc_sk_socks_show();
 254                 break;
 255         case TIPC_CMD_SHOW_STATS:
 256                 rep_tlv_buf = tipc_show_stats();
 257                 break;
 258         case TIPC_CMD_SET_LINK_TOL:
 259         case TIPC_CMD_SET_LINK_PRI:
 260         case TIPC_CMD_SET_LINK_WINDOW:
 261                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
 262                 break;
 263         case TIPC_CMD_ENABLE_BEARER:
 264                 rep_tlv_buf = cfg_enable_bearer();
 265                 break;
 266         case TIPC_CMD_DISABLE_BEARER:
 267                 rep_tlv_buf = cfg_disable_bearer();
 268                 break;
 269         case TIPC_CMD_SET_NODE_ADDR:
 270                 rep_tlv_buf = cfg_set_own_addr();
 271                 break;
 272         case TIPC_CMD_SET_NETID:
 273                 rep_tlv_buf = cfg_set_netid();
 274                 break;
 275         case TIPC_CMD_GET_NETID:
 276                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
 277                 break;
 278         case TIPC_CMD_NOT_NET_ADMIN:
 279                 rep_tlv_buf =
 280                         tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
 281                 break;
 282         case TIPC_CMD_SET_MAX_ZONES:
 283         case TIPC_CMD_GET_MAX_ZONES:
 284         case TIPC_CMD_SET_MAX_SLAVES:
 285         case TIPC_CMD_GET_MAX_SLAVES:
 286         case TIPC_CMD_SET_MAX_CLUSTERS:
 287         case TIPC_CMD_GET_MAX_CLUSTERS:
 288         case TIPC_CMD_SET_MAX_NODES:
 289         case TIPC_CMD_GET_MAX_NODES:
 290         case TIPC_CMD_SET_MAX_SUBSCR:
 291         case TIPC_CMD_GET_MAX_SUBSCR:
 292         case TIPC_CMD_SET_MAX_PUBL:
 293         case TIPC_CMD_GET_MAX_PUBL:
 294         case TIPC_CMD_SET_LOG_SIZE:
 295         case TIPC_CMD_SET_REMOTE_MNG:
 296         case TIPC_CMD_GET_REMOTE_MNG:
 297         case TIPC_CMD_DUMP_LOG:
 298         case TIPC_CMD_SET_MAX_PORTS:
 299         case TIPC_CMD_GET_MAX_PORTS:
 300                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 301                                                           " (obsolete command)");
 302                 break;
 303         default:
 304                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 305                                                           " (unknown command)");
 306                 break;
 307         }
 308
 309         WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));
 310
 311         /* Append an error message if we cannot return all requested data */
 312         if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
 313                 if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
 314                         sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
 315                                 sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
 316         }
 317
 318         /* Return reply buffer */
 319 exit:
 320         rtnl_unlock();
 321         return rep_tlv_buf;
 322 }