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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, 2010-2011, 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
42static u32 config_port_ref;
43
44static DEFINE_SPINLOCK(config_lock);
45
46static const void *req_tlv_area; /* request message TLV area */
47static int req_tlv_space; /* request message TLV area size */
48static int rep_headroom; /* reply message headroom to use */
49
50
51struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
52{
53 struct sk_buff *buf;
54
55 buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
56 if (buf)
57 skb_reserve(buf, rep_headroom);
58 return buf;
59}
60
61int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
62 void *tlv_data, int tlv_data_size)
63{
64 struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
65 int new_tlv_space = TLV_SPACE(tlv_data_size);
66
67 if (skb_tailroom(buf) < new_tlv_space)
68 return 0;
69 skb_put(buf, new_tlv_space);
70 tlv->tlv_type = htons(tlv_type);
71 tlv->tlv_len = htons(TLV_LENGTH(tlv_data_size));
72 if (tlv_data_size && tlv_data)
73 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
74 return 1;
75}
76
77static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
78{
79 struct sk_buff *buf;
80 __be32 value_net;
81
82 buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
83 if (buf) {
84 value_net = htonl(value);
85 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
86 sizeof(value_net));
87 }
88 return buf;
89}
90
91static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
92{
93 return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
94}
95
96struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
97{
98 struct sk_buff *buf;
99 int string_len = strlen(string) + 1;
100
101 buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
102 if (buf)
103 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
104 return buf;
105}
106
107#define MAX_STATS_INFO 2000
108
109static struct sk_buff *tipc_show_stats(void)
110{
111 struct sk_buff *buf;
112 struct tlv_desc *rep_tlv;
113 struct print_buf pb;
114 int str_len;
115 u32 value;
116
117 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
118 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
119
120 value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
121 if (value != 0)
122 return tipc_cfg_reply_error_string("unsupported argument");
123
124 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));
125 if (buf == NULL)
126 return NULL;
127
128 rep_tlv = (struct tlv_desc *)buf->data;
129 tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);
130
131 tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "\n");
132
133 /* Use additional tipc_printf()'s to return more info ... */
134
135 str_len = tipc_printbuf_validate(&pb);
136 skb_put(buf, TLV_SPACE(str_len));
137 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
138
139 return buf;
140}
141
142static struct sk_buff *cfg_enable_bearer(void)
143{
144 struct tipc_bearer_config *args;
145
146 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
147 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
148
149 args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
150 if (tipc_enable_bearer(args->name,
151 ntohl(args->disc_domain),
152 ntohl(args->priority)))
153 return tipc_cfg_reply_error_string("unable to enable bearer");
154
155 return tipc_cfg_reply_none();
156}
157
158static struct sk_buff *cfg_disable_bearer(void)
159{
160 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
161 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
162
163 if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
164 return tipc_cfg_reply_error_string("unable to disable bearer");
165
166 return tipc_cfg_reply_none();
167}
168
169static struct sk_buff *cfg_set_own_addr(void)
170{
171 u32 addr;
172
173 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
174 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
175
176 addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
177 if (addr == tipc_own_addr)
178 return tipc_cfg_reply_none();
179 if (!tipc_addr_node_valid(addr))
180 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
181 " (node address)");
182 if (tipc_mode == TIPC_NET_MODE)
183 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
184 " (cannot change node address once assigned)");
185
186 /*
187 * Must release all spinlocks before calling start_net() because
188 * Linux version of TIPC calls eth_media_start() which calls
189 * register_netdevice_notifier() which may block!
190 *
191 * Temporarily releasing the lock should be harmless for non-Linux TIPC,
192 * but Linux version of eth_media_start() should really be reworked
193 * so that it can be called with spinlocks held.
194 */
195
196 spin_unlock_bh(&config_lock);
197 tipc_core_start_net(addr);
198 spin_lock_bh(&config_lock);
199 return tipc_cfg_reply_none();
200}
201
202static struct sk_buff *cfg_set_remote_mng(void)
203{
204 u32 value;
205
206 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
207 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
208
209 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
210 tipc_remote_management = (value != 0);
211 return tipc_cfg_reply_none();
212}
213
214static struct sk_buff *cfg_set_max_publications(void)
215{
216 u32 value;
217
218 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
219 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
220
221 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
222 if (value != delimit(value, 1, 65535))
223 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
224 " (max publications must be 1-65535)");
225 tipc_max_publications = value;
226 return tipc_cfg_reply_none();
227}
228
229static struct sk_buff *cfg_set_max_subscriptions(void)
230{
231 u32 value;
232
233 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
234 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
235
236 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
237 if (value != delimit(value, 1, 65535))
238 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
239 " (max subscriptions must be 1-65535");
240 tipc_max_subscriptions = value;
241 return tipc_cfg_reply_none();
242}
243
244static struct sk_buff *cfg_set_max_ports(void)
245{
246 u32 value;
247
248 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
249 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
250 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
251 if (value == tipc_max_ports)
252 return tipc_cfg_reply_none();
253 if (value != delimit(value, 127, 65535))
254 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
255 " (max ports must be 127-65535)");
256 if (tipc_mode != TIPC_NOT_RUNNING)
257 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
258 " (cannot change max ports while TIPC is active)");
259 tipc_max_ports = value;
260 return tipc_cfg_reply_none();
261}
262
263static struct sk_buff *cfg_set_netid(void)
264{
265 u32 value;
266
267 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
268 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
269 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
270 if (value == tipc_net_id)
271 return tipc_cfg_reply_none();
272 if (value != delimit(value, 1, 9999))
273 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
274 " (network id must be 1-9999)");
275 if (tipc_mode == TIPC_NET_MODE)
276 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
277 " (cannot change network id once TIPC has joined a network)");
278 tipc_net_id = value;
279 return tipc_cfg_reply_none();
280}
281
282struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
283 int request_space, int reply_headroom)
284{
285 struct sk_buff *rep_tlv_buf;
286
287 spin_lock_bh(&config_lock);
288
289 /* Save request and reply details in a well-known location */
290
291 req_tlv_area = request_area;
292 req_tlv_space = request_space;
293 rep_headroom = reply_headroom;
294
295 /* Check command authorization */
296
297 if (likely(orig_node == tipc_own_addr)) {
298 /* command is permitted */
299 } else if (cmd >= 0x8000) {
300 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
301 " (cannot be done remotely)");
302 goto exit;
303 } else if (!tipc_remote_management) {
304 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
305 goto exit;
306 } else if (cmd >= 0x4000) {
307 u32 domain = 0;
308
309 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
310 (domain != orig_node)) {
311 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
312 goto exit;
313 }
314 }
315
316 /* Call appropriate processing routine */
317
318 switch (cmd) {
319 case TIPC_CMD_NOOP:
320 rep_tlv_buf = tipc_cfg_reply_none();
321 break;
322 case TIPC_CMD_GET_NODES:
323 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
324 break;
325 case TIPC_CMD_GET_LINKS:
326 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
327 break;
328 case TIPC_CMD_SHOW_LINK_STATS:
329 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
330 break;
331 case TIPC_CMD_RESET_LINK_STATS:
332 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
333 break;
334 case TIPC_CMD_SHOW_NAME_TABLE:
335 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
336 break;
337 case TIPC_CMD_GET_BEARER_NAMES:
338 rep_tlv_buf = tipc_bearer_get_names();
339 break;
340 case TIPC_CMD_GET_MEDIA_NAMES:
341 rep_tlv_buf = tipc_media_get_names();
342 break;
343 case TIPC_CMD_SHOW_PORTS:
344 rep_tlv_buf = tipc_port_get_ports();
345 break;
346 case TIPC_CMD_SET_LOG_SIZE:
347 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
348 break;
349 case TIPC_CMD_DUMP_LOG:
350 rep_tlv_buf = tipc_log_dump();
351 break;
352 case TIPC_CMD_SHOW_STATS:
353 rep_tlv_buf = tipc_show_stats();
354 break;
355 case TIPC_CMD_SET_LINK_TOL:
356 case TIPC_CMD_SET_LINK_PRI:
357 case TIPC_CMD_SET_LINK_WINDOW:
358 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
359 break;
360 case TIPC_CMD_ENABLE_BEARER:
361 rep_tlv_buf = cfg_enable_bearer();
362 break;
363 case TIPC_CMD_DISABLE_BEARER:
364 rep_tlv_buf = cfg_disable_bearer();
365 break;
366 case TIPC_CMD_SET_NODE_ADDR:
367 rep_tlv_buf = cfg_set_own_addr();
368 break;
369 case TIPC_CMD_SET_REMOTE_MNG:
370 rep_tlv_buf = cfg_set_remote_mng();
371 break;
372 case TIPC_CMD_SET_MAX_PORTS:
373 rep_tlv_buf = cfg_set_max_ports();
374 break;
375 case TIPC_CMD_SET_MAX_PUBL:
376 rep_tlv_buf = cfg_set_max_publications();
377 break;
378 case TIPC_CMD_SET_MAX_SUBSCR:
379 rep_tlv_buf = cfg_set_max_subscriptions();
380 break;
381 case TIPC_CMD_SET_NETID:
382 rep_tlv_buf = cfg_set_netid();
383 break;
384 case TIPC_CMD_GET_REMOTE_MNG:
385 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
386 break;
387 case TIPC_CMD_GET_MAX_PORTS:
388 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
389 break;
390 case TIPC_CMD_GET_MAX_PUBL:
391 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
392 break;
393 case TIPC_CMD_GET_MAX_SUBSCR:
394 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
395 break;
396 case TIPC_CMD_GET_NETID:
397 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
398 break;
399 case TIPC_CMD_NOT_NET_ADMIN:
400 rep_tlv_buf =
401 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
402 break;
403 case TIPC_CMD_SET_MAX_ZONES:
404 case TIPC_CMD_GET_MAX_ZONES:
405 case TIPC_CMD_SET_MAX_SLAVES:
406 case TIPC_CMD_GET_MAX_SLAVES:
407 case TIPC_CMD_SET_MAX_CLUSTERS:
408 case TIPC_CMD_GET_MAX_CLUSTERS:
409 case TIPC_CMD_SET_MAX_NODES:
410 case TIPC_CMD_GET_MAX_NODES:
411 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
412 " (obsolete command)");
413 break;
414 default:
415 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
416 " (unknown command)");
417 break;
418 }
419
420 /* Return reply buffer */
421exit:
422 spin_unlock_bh(&config_lock);
423 return rep_tlv_buf;
424}
425
426static void cfg_named_msg_event(void *userdata,
427 u32 port_ref,
428 struct sk_buff **buf,
429 const unchar *msg,
430 u32 size,
431 u32 importance,
432 struct tipc_portid const *orig,
433 struct tipc_name_seq const *dest)
434{
435 struct tipc_cfg_msg_hdr *req_hdr;
436 struct tipc_cfg_msg_hdr *rep_hdr;
437 struct sk_buff *rep_buf;
438
439 /* Validate configuration message header (ignore invalid message) */
440
441 req_hdr = (struct tipc_cfg_msg_hdr *)msg;
442 if ((size < sizeof(*req_hdr)) ||
443 (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
444 (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
445 warn("Invalid configuration message discarded\n");
446 return;
447 }
448
449 /* Generate reply for request (if can't, return request) */
450
451 rep_buf = tipc_cfg_do_cmd(orig->node,
452 ntohs(req_hdr->tcm_type),
453 msg + sizeof(*req_hdr),
454 size - sizeof(*req_hdr),
455 BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
456 if (rep_buf) {
457 skb_push(rep_buf, sizeof(*rep_hdr));
458 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
459 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
460 rep_hdr->tcm_len = htonl(rep_buf->len);
461 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
462 } else {
463 rep_buf = *buf;
464 *buf = NULL;
465 }
466
467 /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
468 tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
469}
470
471int tipc_cfg_init(void)
472{
473 struct tipc_name_seq seq;
474 int res;
475
476 res = tipc_createport(NULL, TIPC_CRITICAL_IMPORTANCE,
477 NULL, NULL, NULL,
478 NULL, cfg_named_msg_event, NULL,
479 NULL, &config_port_ref);
480 if (res)
481 goto failed;
482
483 seq.type = TIPC_CFG_SRV;
484 seq.lower = seq.upper = tipc_own_addr;
485 res = tipc_nametbl_publish_rsv(config_port_ref, TIPC_ZONE_SCOPE, &seq);
486 if (res)
487 goto failed;
488
489 return 0;
490
491failed:
492 err("Unable to create configuration service\n");
493 return res;
494}
495
496void tipc_cfg_stop(void)
497{
498 if (config_port_ref) {
499 tipc_deleteport(config_port_ref);
500 config_port_ref = 0;
501 }
502}