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
42 static u32 config_port_ref;
43
44 static DEFINE_SPINLOCK(config_lock);
45
46 static const void *req_tlv_area; /* request message TLV area */
47 static int req_tlv_space; /* request message TLV area size */
48 static int rep_headroom; /* reply message headroom to use */
49
50
tipc_cfg_reply_alloc(int payload_size)51 struct 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
tipc_cfg_append_tlv(struct sk_buff * buf,int tlv_type,void * tlv_data,int tlv_data_size)61 int 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
tipc_cfg_reply_unsigned_type(u16 tlv_type,u32 value)77 static 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
tipc_cfg_reply_unsigned(u32 value)91 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
92 {
93 return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
94 }
95
tipc_cfg_reply_string_type(u16 tlv_type,char * string)96 struct 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
tipc_show_stats(void)109 static 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
cfg_enable_bearer(void)142 static 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
cfg_disable_bearer(void)158 static 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
cfg_set_own_addr(void)169 static 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 temporarily release configuration spinlock while switching into
188 * networking mode as it calls tipc_eth_media_start(), which may sleep.
189 * Releasing the lock is harmless as other locally-issued configuration
190 * commands won't occur until this one completes, and remotely-issued
191 * configuration commands can't be received until a local configuration
192 * command to enable the first bearer is received and processed.
193 */
194
195 spin_unlock_bh(&config_lock);
196 tipc_core_start_net(addr);
197 spin_lock_bh(&config_lock);
198 return tipc_cfg_reply_none();
199 }
200
cfg_set_remote_mng(void)201 static struct sk_buff *cfg_set_remote_mng(void)
202 {
203 u32 value;
204
205 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
206 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
207
208 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
209 tipc_remote_management = (value != 0);
210 return tipc_cfg_reply_none();
211 }
212
cfg_set_max_publications(void)213 static struct sk_buff *cfg_set_max_publications(void)
214 {
215 u32 value;
216
217 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
218 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
219
220 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
221 if (value != delimit(value, 1, 65535))
222 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
223 " (max publications must be 1-65535)");
224 tipc_max_publications = value;
225 return tipc_cfg_reply_none();
226 }
227
cfg_set_max_subscriptions(void)228 static struct sk_buff *cfg_set_max_subscriptions(void)
229 {
230 u32 value;
231
232 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
233 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
234
235 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
236 if (value != delimit(value, 1, 65535))
237 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
238 " (max subscriptions must be 1-65535");
239 tipc_max_subscriptions = value;
240 return tipc_cfg_reply_none();
241 }
242
cfg_set_max_ports(void)243 static struct sk_buff *cfg_set_max_ports(void)
244 {
245 u32 value;
246
247 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
248 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
249 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
250 if (value == tipc_max_ports)
251 return tipc_cfg_reply_none();
252 if (value != delimit(value, 127, 65535))
253 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
254 " (max ports must be 127-65535)");
255 if (tipc_mode != TIPC_NOT_RUNNING)
256 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
257 " (cannot change max ports while TIPC is active)");
258 tipc_max_ports = value;
259 return tipc_cfg_reply_none();
260 }
261
cfg_set_netid(void)262 static struct sk_buff *cfg_set_netid(void)
263 {
264 u32 value;
265
266 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
267 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
268 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
269 if (value == tipc_net_id)
270 return tipc_cfg_reply_none();
271 if (value != delimit(value, 1, 9999))
272 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
273 " (network id must be 1-9999)");
274 if (tipc_mode == TIPC_NET_MODE)
275 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
276 " (cannot change network id once TIPC has joined a network)");
277 tipc_net_id = value;
278 return tipc_cfg_reply_none();
279 }
280
tipc_cfg_do_cmd(u32 orig_node,u16 cmd,const void * request_area,int request_space,int reply_headroom)281 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
282 int request_space, int reply_headroom)
283 {
284 struct sk_buff *rep_tlv_buf;
285
286 spin_lock_bh(&config_lock);
287
288 /* Save request and reply details in a well-known location */
289
290 req_tlv_area = request_area;
291 req_tlv_space = request_space;
292 rep_headroom = reply_headroom;
293
294 /* Check command authorization */
295
296 if (likely(orig_node == tipc_own_addr)) {
297 /* command is permitted */
298 } else if (cmd >= 0x8000) {
299 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
300 " (cannot be done remotely)");
301 goto exit;
302 } else if (!tipc_remote_management) {
303 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
304 goto exit;
305 } else if (cmd >= 0x4000) {
306 u32 domain = 0;
307
308 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
309 (domain != orig_node)) {
310 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
311 goto exit;
312 }
313 }
314
315 /* Call appropriate processing routine */
316
317 switch (cmd) {
318 case TIPC_CMD_NOOP:
319 rep_tlv_buf = tipc_cfg_reply_none();
320 break;
321 case TIPC_CMD_GET_NODES:
322 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
323 break;
324 case TIPC_CMD_GET_LINKS:
325 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
326 break;
327 case TIPC_CMD_SHOW_LINK_STATS:
328 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
329 break;
330 case TIPC_CMD_RESET_LINK_STATS:
331 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
332 break;
333 case TIPC_CMD_SHOW_NAME_TABLE:
334 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
335 break;
336 case TIPC_CMD_GET_BEARER_NAMES:
337 rep_tlv_buf = tipc_bearer_get_names();
338 break;
339 case TIPC_CMD_GET_MEDIA_NAMES:
340 rep_tlv_buf = tipc_media_get_names();
341 break;
342 case TIPC_CMD_SHOW_PORTS:
343 rep_tlv_buf = tipc_port_get_ports();
344 break;
345 case TIPC_CMD_SET_LOG_SIZE:
346 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
347 break;
348 case TIPC_CMD_DUMP_LOG:
349 rep_tlv_buf = tipc_log_dump();
350 break;
351 case TIPC_CMD_SHOW_STATS:
352 rep_tlv_buf = tipc_show_stats();
353 break;
354 case TIPC_CMD_SET_LINK_TOL:
355 case TIPC_CMD_SET_LINK_PRI:
356 case TIPC_CMD_SET_LINK_WINDOW:
357 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
358 break;
359 case TIPC_CMD_ENABLE_BEARER:
360 rep_tlv_buf = cfg_enable_bearer();
361 break;
362 case TIPC_CMD_DISABLE_BEARER:
363 rep_tlv_buf = cfg_disable_bearer();
364 break;
365 case TIPC_CMD_SET_NODE_ADDR:
366 rep_tlv_buf = cfg_set_own_addr();
367 break;
368 case TIPC_CMD_SET_REMOTE_MNG:
369 rep_tlv_buf = cfg_set_remote_mng();
370 break;
371 case TIPC_CMD_SET_MAX_PORTS:
372 rep_tlv_buf = cfg_set_max_ports();
373 break;
374 case TIPC_CMD_SET_MAX_PUBL:
375 rep_tlv_buf = cfg_set_max_publications();
376 break;
377 case TIPC_CMD_SET_MAX_SUBSCR:
378 rep_tlv_buf = cfg_set_max_subscriptions();
379 break;
380 case TIPC_CMD_SET_NETID:
381 rep_tlv_buf = cfg_set_netid();
382 break;
383 case TIPC_CMD_GET_REMOTE_MNG:
384 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
385 break;
386 case TIPC_CMD_GET_MAX_PORTS:
387 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
388 break;
389 case TIPC_CMD_GET_MAX_PUBL:
390 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
391 break;
392 case TIPC_CMD_GET_MAX_SUBSCR:
393 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
394 break;
395 case TIPC_CMD_GET_NETID:
396 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
397 break;
398 case TIPC_CMD_NOT_NET_ADMIN:
399 rep_tlv_buf =
400 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
401 break;
402 case TIPC_CMD_SET_MAX_ZONES:
403 case TIPC_CMD_GET_MAX_ZONES:
404 case TIPC_CMD_SET_MAX_SLAVES:
405 case TIPC_CMD_GET_MAX_SLAVES:
406 case TIPC_CMD_SET_MAX_CLUSTERS:
407 case TIPC_CMD_GET_MAX_CLUSTERS:
408 case TIPC_CMD_SET_MAX_NODES:
409 case TIPC_CMD_GET_MAX_NODES:
410 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
411 " (obsolete command)");
412 break;
413 default:
414 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
415 " (unknown command)");
416 break;
417 }
418
419 /* Return reply buffer */
420 exit:
421 spin_unlock_bh(&config_lock);
422 return rep_tlv_buf;
423 }
424
cfg_named_msg_event(void * userdata,u32 port_ref,struct sk_buff ** buf,const unchar * msg,u32 size,u32 importance,struct tipc_portid const * orig,struct tipc_name_seq const * dest)425 static void cfg_named_msg_event(void *userdata,
426 u32 port_ref,
427 struct sk_buff **buf,
428 const unchar *msg,
429 u32 size,
430 u32 importance,
431 struct tipc_portid const *orig,
432 struct tipc_name_seq const *dest)
433 {
434 struct tipc_cfg_msg_hdr *req_hdr;
435 struct tipc_cfg_msg_hdr *rep_hdr;
436 struct sk_buff *rep_buf;
437
438 /* Validate configuration message header (ignore invalid message) */
439
440 req_hdr = (struct tipc_cfg_msg_hdr *)msg;
441 if ((size < sizeof(*req_hdr)) ||
442 (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
443 (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
444 warn("Invalid configuration message discarded\n");
445 return;
446 }
447
448 /* Generate reply for request (if can't, return request) */
449
450 rep_buf = tipc_cfg_do_cmd(orig->node,
451 ntohs(req_hdr->tcm_type),
452 msg + sizeof(*req_hdr),
453 size - sizeof(*req_hdr),
454 BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
455 if (rep_buf) {
456 skb_push(rep_buf, sizeof(*rep_hdr));
457 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
458 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
459 rep_hdr->tcm_len = htonl(rep_buf->len);
460 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
461 } else {
462 rep_buf = *buf;
463 *buf = NULL;
464 }
465
466 /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
467 tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
468 }
469
tipc_cfg_init(void)470 int tipc_cfg_init(void)
471 {
472 struct tipc_name_seq seq;
473 int res;
474
475 res = tipc_createport(NULL, TIPC_CRITICAL_IMPORTANCE,
476 NULL, NULL, NULL,
477 NULL, cfg_named_msg_event, NULL,
478 NULL, &config_port_ref);
479 if (res)
480 goto failed;
481
482 seq.type = TIPC_CFG_SRV;
483 seq.lower = seq.upper = tipc_own_addr;
484 res = tipc_nametbl_publish_rsv(config_port_ref, TIPC_ZONE_SCOPE, &seq);
485 if (res)
486 goto failed;
487
488 return 0;
489
490 failed:
491 err("Unable to create configuration service\n");
492 return res;
493 }
494
tipc_cfg_stop(void)495 void tipc_cfg_stop(void)
496 {
497 if (config_port_ref) {
498 tipc_deleteport(config_port_ref);
499 config_port_ref = 0;
500 }
501 }
502