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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 str_len = tipc_printbuf_validate(&pb);
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
141static 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
157static 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
168static 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
185 /*
186 * Must temporarily release configuration spinlock while switching into
187 * networking mode as it calls tipc_eth_media_start(), which may sleep.
188 * Releasing the lock is harmless as other locally-issued configuration
189 * commands won't occur until this one completes, and remotely-issued
190 * configuration commands can't be received until a local configuration
191 * command to enable the first bearer is received and processed.
192 */
193 spin_unlock_bh(&config_lock);
194 tipc_core_start_net(addr);
195 spin_lock_bh(&config_lock);
196 return tipc_cfg_reply_none();
197}
198
199static struct sk_buff *cfg_set_remote_mng(void)
200{
201 u32 value;
202
203 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
204 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
205
206 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
207 tipc_remote_management = (value != 0);
208 return tipc_cfg_reply_none();
209}
210
211static struct sk_buff *cfg_set_max_publications(void)
212{
213 u32 value;
214
215 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
216 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
217
218 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
219 if (value < 1 || value > 65535)
220 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
221 " (max publications must be 1-65535)");
222 tipc_max_publications = value;
223 return tipc_cfg_reply_none();
224}
225
226static struct sk_buff *cfg_set_max_subscriptions(void)
227{
228 u32 value;
229
230 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
231 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
232
233 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
234 if (value < 1 || value > 65535)
235 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
236 " (max subscriptions must be 1-65535");
237 tipc_max_subscriptions = value;
238 return tipc_cfg_reply_none();
239}
240
241static struct sk_buff *cfg_set_max_ports(void)
242{
243 u32 value;
244
245 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
246 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
247 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
248 if (value == tipc_max_ports)
249 return tipc_cfg_reply_none();
250 if (value < 127 || value > 65535)
251 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
252 " (max ports must be 127-65535)");
253 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
254 " (cannot change max ports while TIPC is active)");
255}
256
257static struct sk_buff *cfg_set_netid(void)
258{
259 u32 value;
260
261 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
262 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
263 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
264 if (value == tipc_net_id)
265 return tipc_cfg_reply_none();
266 if (value < 1 || value > 9999)
267 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
268 " (network id must be 1-9999)");
269 if (tipc_own_addr)
270 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
271 " (cannot change network id once TIPC has joined a network)");
272 tipc_net_id = value;
273 return tipc_cfg_reply_none();
274}
275
276struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
277 int request_space, int reply_headroom)
278{
279 struct sk_buff *rep_tlv_buf;
280
281 spin_lock_bh(&config_lock);
282
283 /* Save request and reply details in a well-known location */
284 req_tlv_area = request_area;
285 req_tlv_space = request_space;
286 rep_headroom = reply_headroom;
287
288 /* Check command authorization */
289 if (likely(in_own_node(orig_node))) {
290 /* command is permitted */
291 } else if (cmd >= 0x8000) {
292 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
293 " (cannot be done remotely)");
294 goto exit;
295 } else if (!tipc_remote_management) {
296 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
297 goto exit;
298 } else if (cmd >= 0x4000) {
299 u32 domain = 0;
300
301 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
302 (domain != orig_node)) {
303 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
304 goto exit;
305 }
306 }
307
308 /* Call appropriate processing routine */
309 switch (cmd) {
310 case TIPC_CMD_NOOP:
311 rep_tlv_buf = tipc_cfg_reply_none();
312 break;
313 case TIPC_CMD_GET_NODES:
314 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
315 break;
316 case TIPC_CMD_GET_LINKS:
317 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
318 break;
319 case TIPC_CMD_SHOW_LINK_STATS:
320 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
321 break;
322 case TIPC_CMD_RESET_LINK_STATS:
323 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
324 break;
325 case TIPC_CMD_SHOW_NAME_TABLE:
326 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
327 break;
328 case TIPC_CMD_GET_BEARER_NAMES:
329 rep_tlv_buf = tipc_bearer_get_names();
330 break;
331 case TIPC_CMD_GET_MEDIA_NAMES:
332 rep_tlv_buf = tipc_media_get_names();
333 break;
334 case TIPC_CMD_SHOW_PORTS:
335 rep_tlv_buf = tipc_port_get_ports();
336 break;
337 case TIPC_CMD_SET_LOG_SIZE:
338 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
339 break;
340 case TIPC_CMD_DUMP_LOG:
341 rep_tlv_buf = tipc_log_dump();
342 break;
343 case TIPC_CMD_SHOW_STATS:
344 rep_tlv_buf = tipc_show_stats();
345 break;
346 case TIPC_CMD_SET_LINK_TOL:
347 case TIPC_CMD_SET_LINK_PRI:
348 case TIPC_CMD_SET_LINK_WINDOW:
349 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
350 break;
351 case TIPC_CMD_ENABLE_BEARER:
352 rep_tlv_buf = cfg_enable_bearer();
353 break;
354 case TIPC_CMD_DISABLE_BEARER:
355 rep_tlv_buf = cfg_disable_bearer();
356 break;
357 case TIPC_CMD_SET_NODE_ADDR:
358 rep_tlv_buf = cfg_set_own_addr();
359 break;
360 case TIPC_CMD_SET_REMOTE_MNG:
361 rep_tlv_buf = cfg_set_remote_mng();
362 break;
363 case TIPC_CMD_SET_MAX_PORTS:
364 rep_tlv_buf = cfg_set_max_ports();
365 break;
366 case TIPC_CMD_SET_MAX_PUBL:
367 rep_tlv_buf = cfg_set_max_publications();
368 break;
369 case TIPC_CMD_SET_MAX_SUBSCR:
370 rep_tlv_buf = cfg_set_max_subscriptions();
371 break;
372 case TIPC_CMD_SET_NETID:
373 rep_tlv_buf = cfg_set_netid();
374 break;
375 case TIPC_CMD_GET_REMOTE_MNG:
376 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
377 break;
378 case TIPC_CMD_GET_MAX_PORTS:
379 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
380 break;
381 case TIPC_CMD_GET_MAX_PUBL:
382 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
383 break;
384 case TIPC_CMD_GET_MAX_SUBSCR:
385 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
386 break;
387 case TIPC_CMD_GET_NETID:
388 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
389 break;
390 case TIPC_CMD_NOT_NET_ADMIN:
391 rep_tlv_buf =
392 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
393 break;
394 case TIPC_CMD_SET_MAX_ZONES:
395 case TIPC_CMD_GET_MAX_ZONES:
396 case TIPC_CMD_SET_MAX_SLAVES:
397 case TIPC_CMD_GET_MAX_SLAVES:
398 case TIPC_CMD_SET_MAX_CLUSTERS:
399 case TIPC_CMD_GET_MAX_CLUSTERS:
400 case TIPC_CMD_SET_MAX_NODES:
401 case TIPC_CMD_GET_MAX_NODES:
402 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
403 " (obsolete command)");
404 break;
405 default:
406 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
407 " (unknown command)");
408 break;
409 }
410
411 /* Return reply buffer */
412exit:
413 spin_unlock_bh(&config_lock);
414 return rep_tlv_buf;
415}
416
417static void cfg_named_msg_event(void *userdata,
418 u32 port_ref,
419 struct sk_buff **buf,
420 const unchar *msg,
421 u32 size,
422 u32 importance,
423 struct tipc_portid const *orig,
424 struct tipc_name_seq const *dest)
425{
426 struct tipc_cfg_msg_hdr *req_hdr;
427 struct tipc_cfg_msg_hdr *rep_hdr;
428 struct sk_buff *rep_buf;
429
430 /* Validate configuration message header (ignore invalid message) */
431 req_hdr = (struct tipc_cfg_msg_hdr *)msg;
432 if ((size < sizeof(*req_hdr)) ||
433 (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
434 (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
435 warn("Invalid configuration message discarded\n");
436 return;
437 }
438
439 /* Generate reply for request (if can't, return request) */
440 rep_buf = tipc_cfg_do_cmd(orig->node,
441 ntohs(req_hdr->tcm_type),
442 msg + sizeof(*req_hdr),
443 size - sizeof(*req_hdr),
444 BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
445 if (rep_buf) {
446 skb_push(rep_buf, sizeof(*rep_hdr));
447 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
448 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
449 rep_hdr->tcm_len = htonl(rep_buf->len);
450 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
451 } else {
452 rep_buf = *buf;
453 *buf = NULL;
454 }
455
456 /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
457 tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
458}
459
460int tipc_cfg_init(void)
461{
462 struct tipc_name_seq seq;
463 int res;
464
465 res = tipc_createport(NULL, TIPC_CRITICAL_IMPORTANCE,
466 NULL, NULL, NULL,
467 NULL, cfg_named_msg_event, NULL,
468 NULL, &config_port_ref);
469 if (res)
470 goto failed;
471
472 seq.type = TIPC_CFG_SRV;
473 seq.lower = seq.upper = tipc_own_addr;
474 res = tipc_publish(config_port_ref, TIPC_ZONE_SCOPE, &seq);
475 if (res)
476 goto failed;
477
478 return 0;
479
480failed:
481 err("Unable to create configuration service\n");
482 return res;
483}
484
485void tipc_cfg_reinit(void)
486{
487 struct tipc_name_seq seq;
488 int res;
489
490 seq.type = TIPC_CFG_SRV;
491 seq.lower = seq.upper = 0;
492 tipc_withdraw(config_port_ref, TIPC_ZONE_SCOPE, &seq);
493
494 seq.lower = seq.upper = tipc_own_addr;
495 res = tipc_publish(config_port_ref, TIPC_ZONE_SCOPE, &seq);
496 if (res)
497 err("Unable to reinitialize configuration service\n");
498}
499
500void tipc_cfg_stop(void)
501{
502 tipc_deleteport(config_port_ref);
503 config_port_ref = 0;
504}