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[linux-2.6.git] / 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) 2004-2005, 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 "dbg.h"
39 #include "bearer.h"
40 #include "port.h"
41 #include "link.h"
42 #include "zone.h"
43 #include "addr.h"
44 #include "name_table.h"
45 #include "node.h"
46 #include "config.h"
47 #include "discover.h"
48
49 struct subscr_data {
50         char usr_handle[8];
51         u32 domain;
52         u32 port_ref;
53         struct list_head subd_list;
54 };
55
56 struct manager {
57         u32 user_ref;
58         u32 port_ref;
59         u32 subscr_ref;
60         u32 link_subscriptions;
61         struct list_head link_subscribers;
62 };
63
64 static struct manager mng = { 0};
65
66 static spinlock_t config_lock = SPIN_LOCK_UNLOCKED;
67
68 static const void *req_tlv_area;        /* request message TLV area */
69 static int req_tlv_space;               /* request message TLV area size */
70 static int rep_headroom;                /* reply message headroom to use */
71
72
73 void tipc_cfg_link_event(u32 addr, char *name, int up)
74 {
75         /* TIPC DOESN'T HANDLE LINK EVENT SUBSCRIPTIONS AT THE MOMENT */
76 }
77
78
79 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
80 {
81         struct sk_buff *buf;
82
83         buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
84         if (buf)
85                 skb_reserve(buf, rep_headroom);
86         return buf;
87 }
88
89 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type, 
90                         void *tlv_data, int tlv_data_size)
91 {
92         struct tlv_desc *tlv = (struct tlv_desc *)buf->tail;
93         int new_tlv_space = TLV_SPACE(tlv_data_size);
94
95         if (skb_tailroom(buf) < new_tlv_space) {
96                 dbg("tipc_cfg_append_tlv unable to append TLV\n");
97                 return 0;
98         }
99         skb_put(buf, new_tlv_space);
100         tlv->tlv_type = htons(tlv_type);
101         tlv->tlv_len  = htons(TLV_LENGTH(tlv_data_size));
102         if (tlv_data_size && tlv_data)
103                 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
104         return 1;
105 }
106
107 struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
108 {
109         struct sk_buff *buf;
110         u32 value_net;
111
112         buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
113         if (buf) {
114                 value_net = htonl(value);
115                 tipc_cfg_append_tlv(buf, tlv_type, &value_net, 
116                                     sizeof(value_net));
117         }
118         return buf;
119 }
120
121 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
122 {
123         struct sk_buff *buf;
124         int string_len = strlen(string) + 1;
125
126         buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
127         if (buf)
128                 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
129         return buf;
130 }
131
132
133
134
135 #if 0
136
137 /* Now obsolete code for handling commands not yet implemented the new way */
138
139 int tipc_cfg_cmd(const struct tipc_cmd_msg * msg,
140                  char *data,
141                  u32 sz,
142                  u32 *ret_size,
143                  struct tipc_portid *orig)
144 {
145         int rv = -EINVAL;
146         u32 cmd = msg->cmd;
147
148         *ret_size = 0;
149         switch (cmd) {
150         case TIPC_REMOVE_LINK:
151         case TIPC_CMD_BLOCK_LINK:
152         case TIPC_CMD_UNBLOCK_LINK:
153                 if (!cfg_check_connection(orig))
154                         rv = link_control(msg->argv.link_name, msg->cmd, 0);
155                 break;
156         case TIPC_ESTABLISH:
157                 {
158                         int connected;
159
160                         tipc_isconnected(mng.conn_port_ref, &connected);
161                         if (connected || !orig) {
162                                 rv = TIPC_FAILURE;
163                                 break;
164                         }
165                         rv = tipc_connect2port(mng.conn_port_ref, orig);
166                         if (rv == TIPC_OK)
167                                 orig = 0;
168                         break;
169                 }
170         case TIPC_GET_PEER_ADDRESS:
171                 *ret_size = link_peer_addr(msg->argv.link_name, data, sz);
172                 break;
173         case TIPC_GET_ROUTES:
174                 rv = TIPC_OK;
175                 break;
176         default: {}
177         }
178         if (*ret_size)
179                 rv = TIPC_OK;
180         return rv;
181 }
182
183 static void cfg_cmd_event(struct tipc_cmd_msg *msg,
184                           char *data,
185                           u32 sz,        
186                           struct tipc_portid const *orig)
187 {
188         int rv = -EINVAL;
189         struct tipc_cmd_result_msg rmsg;
190         struct iovec msg_sect[2];
191         int *arg;
192
193         msg->cmd = ntohl(msg->cmd);
194
195         cfg_prepare_res_msg(msg->cmd, msg->usr_handle, rv, &rmsg, msg_sect, 
196                             data, 0);
197         if (ntohl(msg->magic) != TIPC_MAGIC)
198                 goto exit;
199
200         switch (msg->cmd) {
201         case TIPC_CREATE_LINK:
202                 if (!cfg_check_connection(orig))
203                         rv = disc_create_link(&msg->argv.create_link);
204                 break;
205         case TIPC_LINK_SUBSCRIBE:
206                 {
207                         struct subscr_data *sub;
208
209                         if (mng.link_subscriptions > 64)
210                                 break;
211                         sub = (struct subscr_data *)kmalloc(sizeof(*sub),
212                                                             GFP_ATOMIC);
213                         if (sub == NULL) {
214                                 warn("Memory squeeze; dropped remote link subscription\n");
215                                 break;
216                         }
217                         INIT_LIST_HEAD(&sub->subd_list);
218                         tipc_createport(mng.user_ref,
219                                         (void *)sub,
220                                         TIPC_HIGH_IMPORTANCE,
221                                         0,
222                                         0,
223                                         (tipc_conn_shutdown_event)cfg_linksubscr_cancel,
224                                         0,
225                                         0,
226                                         (tipc_conn_msg_event)cfg_linksubscr_cancel,
227                                         0,
228                                         &sub->port_ref);
229                         if (!sub->port_ref) {
230                                 kfree(sub);
231                                 break;
232                         }
233                         memcpy(sub->usr_handle,msg->usr_handle,
234                                sizeof(sub->usr_handle));
235                         sub->domain = msg->argv.domain;
236                         list_add_tail(&sub->subd_list, &mng.link_subscribers);
237                         tipc_connect2port(sub->port_ref, orig);
238                         rmsg.retval = TIPC_OK;
239                         tipc_send(sub->port_ref, 2u, msg_sect);
240                         mng.link_subscriptions++;
241                         return;
242                 }
243         default:
244                 rv = tipc_cfg_cmd(msg, data, sz, (u32 *)&msg_sect[1].iov_len, orig);
245         }
246         exit:
247         rmsg.result_len = htonl(msg_sect[1].iov_len);
248         rmsg.retval = htonl(rv);
249         tipc_cfg_respond(msg_sect, 2u, orig);
250 }
251 #endif
252
253 static struct sk_buff *cfg_enable_bearer(void)
254 {
255         struct tipc_bearer_config *args;
256
257         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
258                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
259
260         args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
261         if (tipc_enable_bearer(args->name,
262                                ntohl(args->detect_scope),
263                                ntohl(args->priority)))
264                 return tipc_cfg_reply_error_string("unable to enable bearer");
265
266         return tipc_cfg_reply_none();
267 }
268
269 static struct sk_buff *cfg_disable_bearer(void)
270 {
271         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
272                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
273
274         if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
275                 return tipc_cfg_reply_error_string("unable to disable bearer");
276
277         return tipc_cfg_reply_none();
278 }
279
280 static struct sk_buff *cfg_set_own_addr(void)
281 {
282         u32 addr;
283
284         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
285                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
286
287         addr = *(u32 *)TLV_DATA(req_tlv_area);
288         addr = ntohl(addr);
289         if (addr == tipc_own_addr)
290                 return tipc_cfg_reply_none();
291         if (!tipc_addr_node_valid(addr))
292                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
293                                                    " (node address)");
294         if (tipc_own_addr)
295                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
296                                                    " (cannot change node address once assigned)");
297
298         spin_unlock_bh(&config_lock);
299         tipc_core_stop_net();
300         tipc_own_addr = addr;
301         tipc_core_start_net();
302         spin_lock_bh(&config_lock);
303         return tipc_cfg_reply_none();
304 }
305
306 static struct sk_buff *cfg_set_remote_mng(void)
307 {
308         u32 value;
309
310         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
311                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
312
313         value = *(u32 *)TLV_DATA(req_tlv_area);
314         value = ntohl(value);
315         tipc_remote_management = (value != 0);
316         return tipc_cfg_reply_none();
317 }
318
319 static struct sk_buff *cfg_set_max_publications(void)
320 {
321         u32 value;
322
323         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
324                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
325
326         value = *(u32 *)TLV_DATA(req_tlv_area);
327         value = ntohl(value);
328         if (value != delimit(value, 1, 65535))
329                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
330                                                    " (max publications must be 1-65535)");
331         tipc_max_publications = value;
332         return tipc_cfg_reply_none();
333 }
334
335 static struct sk_buff *cfg_set_max_subscriptions(void)
336 {
337         u32 value;
338
339         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
340                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
341
342         value = *(u32 *)TLV_DATA(req_tlv_area);
343         value = ntohl(value);
344         if (value != delimit(value, 1, 65535))
345                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
346                                                    " (max subscriptions must be 1-65535");
347         tipc_max_subscriptions = value;
348         return tipc_cfg_reply_none();
349 }
350
351 static struct sk_buff *cfg_set_max_ports(void)
352 {
353         int orig_mode;
354         u32 value;
355
356         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
357                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
358         value = *(u32 *)TLV_DATA(req_tlv_area);
359         value = ntohl(value);
360         if (value != delimit(value, 127, 65535))
361                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
362                                                    " (max ports must be 127-65535)");
363
364         if (value == tipc_max_ports)
365                 return tipc_cfg_reply_none();
366
367         if (atomic_read(&tipc_user_count) > 2)
368                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
369                                                    " (cannot change max ports while TIPC users exist)");
370
371         spin_unlock_bh(&config_lock);
372         orig_mode = tipc_get_mode();
373         if (orig_mode == TIPC_NET_MODE)
374                 tipc_core_stop_net();
375         tipc_core_stop();
376         tipc_max_ports = value;
377         tipc_core_start();
378         if (orig_mode == TIPC_NET_MODE)
379                 tipc_core_start_net();
380         spin_lock_bh(&config_lock);
381         return tipc_cfg_reply_none();
382 }
383
384 static struct sk_buff *set_net_max(int value, int *parameter)
385 {
386         int orig_mode;
387
388         if (value != *parameter) {
389                 orig_mode = tipc_get_mode();
390                 if (orig_mode == TIPC_NET_MODE)
391                         tipc_core_stop_net();
392                 *parameter = value;
393                 if (orig_mode == TIPC_NET_MODE)
394                         tipc_core_start_net();
395         }
396
397         return tipc_cfg_reply_none();
398 }
399
400 static struct sk_buff *cfg_set_max_zones(void)
401 {
402         u32 value;
403
404         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
405                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
406         value = *(u32 *)TLV_DATA(req_tlv_area);
407         value = ntohl(value);
408         if (value != delimit(value, 1, 255))
409                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
410                                                    " (max zones must be 1-255)");
411         return set_net_max(value, &tipc_max_zones);
412 }
413
414 static struct sk_buff *cfg_set_max_clusters(void)
415 {
416         u32 value;
417
418         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
419                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
420         value = *(u32 *)TLV_DATA(req_tlv_area);
421         value = ntohl(value);
422         if (value != 1)
423                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
424                                                    " (max clusters fixed at 1)");
425         return tipc_cfg_reply_none();
426 }
427
428 static struct sk_buff *cfg_set_max_nodes(void)
429 {
430         u32 value;
431
432         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
433                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
434         value = *(u32 *)TLV_DATA(req_tlv_area);
435         value = ntohl(value);
436         if (value != delimit(value, 8, 2047))
437                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
438                                                    " (max nodes must be 8-2047)");
439         return set_net_max(value, &tipc_max_nodes);
440 }
441
442 static struct sk_buff *cfg_set_max_slaves(void)
443 {
444         u32 value;
445
446         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
447                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
448         value = *(u32 *)TLV_DATA(req_tlv_area);
449         value = ntohl(value);
450         if (value != 0)
451                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
452                                                    " (max secondary nodes fixed at 0)");
453         return tipc_cfg_reply_none();
454 }
455
456 static struct sk_buff *cfg_set_netid(void)
457 {
458         u32 value;
459
460         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
461                 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
462         value = *(u32 *)TLV_DATA(req_tlv_area);
463         value = ntohl(value);
464         if (value != delimit(value, 1, 9999))
465                 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
466                                                    " (network id must be 1-9999)");
467
468         if (tipc_own_addr)
469                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
470                                                    " (cannot change network id once part of network)");
471         
472         return set_net_max(value, &tipc_net_id);
473 }
474
475 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
476                                 int request_space, int reply_headroom)
477 {
478         struct sk_buff *rep_tlv_buf;
479
480         spin_lock_bh(&config_lock);
481
482         /* Save request and reply details in a well-known location */
483
484         req_tlv_area = request_area;
485         req_tlv_space = request_space;
486         rep_headroom = reply_headroom;
487
488         /* Check command authorization */
489
490         if (likely(orig_node == tipc_own_addr)) {
491                 /* command is permitted */
492         } else if (cmd >= 0x8000) {
493                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
494                                                           " (cannot be done remotely)");
495                 goto exit;
496         } else if (!tipc_remote_management) {
497                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
498                 goto exit;
499         }
500         else if (cmd >= 0x4000) {
501                 u32 domain = 0;
502
503                 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
504                     (domain != orig_node)) {
505                         rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
506                         goto exit;
507                 }
508         }
509
510         /* Call appropriate processing routine */
511
512         switch (cmd) {
513         case TIPC_CMD_NOOP:
514                 rep_tlv_buf = tipc_cfg_reply_none();
515                 break;
516         case TIPC_CMD_GET_NODES:
517                 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
518                 break;
519         case TIPC_CMD_GET_LINKS:
520                 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
521                 break;
522         case TIPC_CMD_SHOW_LINK_STATS:
523                 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
524                 break;
525         case TIPC_CMD_RESET_LINK_STATS:
526                 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
527                 break;
528         case TIPC_CMD_SHOW_NAME_TABLE:
529                 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
530                 break;
531         case TIPC_CMD_GET_BEARER_NAMES:
532                 rep_tlv_buf = tipc_bearer_get_names();
533                 break;
534         case TIPC_CMD_GET_MEDIA_NAMES:
535                 rep_tlv_buf = tipc_media_get_names();
536                 break;
537         case TIPC_CMD_SHOW_PORTS:
538                 rep_tlv_buf = tipc_port_get_ports();
539                 break;
540 #if 0
541         case TIPC_CMD_SHOW_PORT_STATS:
542                 rep_tlv_buf = port_show_stats(req_tlv_area, req_tlv_space);
543                 break;
544         case TIPC_CMD_RESET_PORT_STATS:
545                 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED);
546                 break;
547 #endif
548         case TIPC_CMD_SET_LOG_SIZE:
549                 rep_tlv_buf = tipc_log_resize(req_tlv_area, req_tlv_space);
550                 break;
551         case TIPC_CMD_DUMP_LOG:
552                 rep_tlv_buf = tipc_log_dump();
553                 break;
554         case TIPC_CMD_SET_LINK_TOL:
555         case TIPC_CMD_SET_LINK_PRI:
556         case TIPC_CMD_SET_LINK_WINDOW:
557                 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
558                 break;
559         case TIPC_CMD_ENABLE_BEARER:
560                 rep_tlv_buf = cfg_enable_bearer();
561                 break;
562         case TIPC_CMD_DISABLE_BEARER:
563                 rep_tlv_buf = cfg_disable_bearer();
564                 break;
565         case TIPC_CMD_SET_NODE_ADDR:
566                 rep_tlv_buf = cfg_set_own_addr();
567                 break;
568         case TIPC_CMD_SET_REMOTE_MNG:
569                 rep_tlv_buf = cfg_set_remote_mng();
570                 break;
571         case TIPC_CMD_SET_MAX_PORTS:
572                 rep_tlv_buf = cfg_set_max_ports();
573                 break;
574         case TIPC_CMD_SET_MAX_PUBL:
575                 rep_tlv_buf = cfg_set_max_publications();
576                 break;
577         case TIPC_CMD_SET_MAX_SUBSCR:
578                 rep_tlv_buf = cfg_set_max_subscriptions();
579                 break;
580         case TIPC_CMD_SET_MAX_ZONES:
581                 rep_tlv_buf = cfg_set_max_zones();
582                 break;
583         case TIPC_CMD_SET_MAX_CLUSTERS:
584                 rep_tlv_buf = cfg_set_max_clusters();
585                 break;
586         case TIPC_CMD_SET_MAX_NODES:
587                 rep_tlv_buf = cfg_set_max_nodes();
588                 break;
589         case TIPC_CMD_SET_MAX_SLAVES:
590                 rep_tlv_buf = cfg_set_max_slaves();
591                 break;
592         case TIPC_CMD_SET_NETID:
593                 rep_tlv_buf = cfg_set_netid();
594                 break;
595         case TIPC_CMD_GET_REMOTE_MNG:
596                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
597                 break;
598         case TIPC_CMD_GET_MAX_PORTS:
599                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
600                 break;
601         case TIPC_CMD_GET_MAX_PUBL:
602                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
603                 break;
604         case TIPC_CMD_GET_MAX_SUBSCR:
605                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
606                 break;
607         case TIPC_CMD_GET_MAX_ZONES:
608                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_zones);
609                 break;
610         case TIPC_CMD_GET_MAX_CLUSTERS:
611                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_clusters);
612                 break;
613         case TIPC_CMD_GET_MAX_NODES:
614                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
615                 break;
616         case TIPC_CMD_GET_MAX_SLAVES:
617                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_slaves);
618                 break;
619         case TIPC_CMD_GET_NETID:
620                 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
621                 break;
622         default:
623                 rep_tlv_buf = NULL;
624                 break;
625         }
626
627         /* Return reply buffer */
628 exit:
629         spin_unlock_bh(&config_lock);
630         return rep_tlv_buf;
631 }
632
633 static void cfg_named_msg_event(void *userdata,
634                                 u32 port_ref,
635                                 struct sk_buff **buf,
636                                 const unchar *msg,
637                                 u32 size,
638                                 u32 importance, 
639                                 struct tipc_portid const *orig,
640                                 struct tipc_name_seq const *dest)
641 {
642         struct tipc_cfg_msg_hdr *req_hdr;
643         struct tipc_cfg_msg_hdr *rep_hdr;
644         struct sk_buff *rep_buf;
645
646         /* Validate configuration message header (ignore invalid message) */
647
648         req_hdr = (struct tipc_cfg_msg_hdr *)msg;
649         if ((size < sizeof(*req_hdr)) ||
650             (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
651             (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
652                 warn("discarded invalid configuration message\n");
653                 return;
654         }
655
656         /* Generate reply for request (if can't, return request) */
657
658         rep_buf = tipc_cfg_do_cmd(orig->node,
659                                   ntohs(req_hdr->tcm_type), 
660                                   msg + sizeof(*req_hdr),
661                                   size - sizeof(*req_hdr),
662                                   BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
663         if (rep_buf) {
664                 skb_push(rep_buf, sizeof(*rep_hdr));
665                 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
666                 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
667                 rep_hdr->tcm_len = htonl(rep_buf->len);
668                 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
669         } else {
670                 rep_buf = *buf;
671                 *buf = NULL;
672         }
673
674         /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
675         tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
676 }
677
678 int tipc_cfg_init(void)
679 {
680         struct tipc_name_seq seq;
681         int res;
682
683         memset(&mng, 0, sizeof(mng));
684         INIT_LIST_HEAD(&mng.link_subscribers);
685
686         res = tipc_attach(&mng.user_ref, NULL, NULL);
687         if (res)
688                 goto failed;
689
690         res = tipc_createport(mng.user_ref, NULL, TIPC_CRITICAL_IMPORTANCE,
691                               NULL, NULL, NULL,
692                               NULL, cfg_named_msg_event, NULL,
693                               NULL, &mng.port_ref);
694         if (res)
695                 goto failed;
696
697         seq.type = TIPC_CFG_SRV;
698         seq.lower = seq.upper = tipc_own_addr;
699         res = tipc_nametbl_publish_rsv(mng.port_ref, TIPC_ZONE_SCOPE, &seq);
700         if (res)
701                 goto failed;
702
703         return 0;
704
705 failed:
706         err("Unable to create configuration service\n");
707         tipc_detach(mng.user_ref);
708         mng.user_ref = 0;
709         return res;
710 }
711
712 void tipc_cfg_stop(void)
713 {
714         if (mng.user_ref) {
715                 tipc_detach(mng.user_ref);
716                 mng.user_ref = 0;
717         }
718 }