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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
49struct subscr_data {
50 char usr_handle[8];
51 u32 domain;
52 u32 port_ref;
53 struct list_head subd_list;
54};
55
56struct 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
64static struct manager mng = { 0};
65
66static spinlock_t config_lock = SPIN_LOCK_UNLOCKED;
67
68static const void *req_tlv_area; /* request message TLV area */
69static int req_tlv_space; /* request message TLV area size */
70static int rep_headroom; /* reply message headroom to use */
71
72
73void 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
79struct 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
89int 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
107struct 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
121struct 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
139int 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
183static 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
253static 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
269static 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
280static 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
306static 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
319static 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
335static 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
351static 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
384static 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
400static 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
414static 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
428static 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
442static 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
456static 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
475struct 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 */
628exit:
629 spin_unlock_bh(&config_lock);
630 return rep_tlv_buf;
631}
632
633static 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
678int 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
705failed:
706 err("Unable to create configuration service\n");
707 tipc_detach(mng.user_ref);
708 mng.user_ref = 0;
709 return res;
710}
711
712void tipc_cfg_stop(void)
713{
714 if (mng.user_ref) {
715 tipc_detach(mng.user_ref);
716 mng.user_ref = 0;
717 }
718}