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TOMOYO Linux Cross Reference
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, 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_net_start(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 
380         /* Validate configuration message header (ignore invalid message) */
381         req_hdr = (struct tipc_cfg_msg_hdr *)buf;
382         if ((len < sizeof(*req_hdr)) ||
383             (len != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
384             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
385                 pr_warn("Invalid configuration message discarded\n");
386                 return;
387         }
388 
389         /* Generate reply for request (if can't, return request) */
390         rep_buf = tipc_cfg_do_cmd(addr->addr.id.node, ntohs(req_hdr->tcm_type),
391                                   buf + sizeof(*req_hdr),
392                                   len - sizeof(*req_hdr),
393                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
394         if (rep_buf) {
395                 skb_push(rep_buf, sizeof(*rep_hdr));
396                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
397                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
398                 rep_hdr->tcm_len = htonl(rep_buf->len);
399                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
400                 tipc_conn_sendmsg(&cfgsrv, conid, addr, rep_buf->data,
401                                   rep_buf->len);
402                 kfree_skb(rep_buf);
403         }
404 }
405 
406 static struct sockaddr_tipc cfgsrv_addr __read_mostly = {
407         .family                 = AF_TIPC,
408         .addrtype               = TIPC_ADDR_NAMESEQ,
409         .addr.nameseq.type      = TIPC_CFG_SRV,
410         .addr.nameseq.lower     = 0,
411         .addr.nameseq.upper     = 0,
412         .scope                  = TIPC_ZONE_SCOPE
413 };
414 
415 static struct tipc_server cfgsrv __read_mostly = {
416         .saddr                  = &cfgsrv_addr,
417         .imp                    = TIPC_CRITICAL_IMPORTANCE,
418         .type                   = SOCK_RDM,
419         .max_rcvbuf_size        = 64 * 1024,
420         .name                   = "cfg_server",
421         .tipc_conn_recvmsg      = cfg_conn_msg_event,
422         .tipc_conn_new          = NULL,
423         .tipc_conn_shutdown     = NULL
424 };
425 
426 int tipc_cfg_init(void)
427 {
428         return tipc_server_start(&cfgsrv);
429 }
430 
431 void tipc_cfg_reinit(void)
432 {
433         tipc_server_stop(&cfgsrv);
434 
435         cfgsrv_addr.addr.nameseq.lower = tipc_own_addr;
436         cfgsrv_addr.addr.nameseq.upper = tipc_own_addr;
437         tipc_server_start(&cfgsrv);
438 }
439 
440 void tipc_cfg_stop(void)
441 {
442         tipc_server_stop(&cfgsrv);
443 }
444 

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