ipv6: netfilter: ip6_tables: fix infoleak to userspace
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / tipc / config.c
blobe16750dcf3c18d78808e13081a7193529e4737bc
1 /*
2 * net/tipc/config.c: TIPC configuration management code
4 * Copyright (c) 2002-2006, Ericsson AB
5 * Copyright (c) 2004-2007, Wind River Systems
6 * All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
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.
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.
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.
37 #include "core.h"
38 #include "port.h"
39 #include "name_table.h"
40 #include "config.h"
42 static u32 config_port_ref;
44 static DEFINE_SPINLOCK(config_lock);
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 */
51 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
53 struct sk_buff *buf;
55 buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
56 if (buf)
57 skb_reserve(buf, rep_headroom);
58 return buf;
61 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
62 void *tlv_data, int tlv_data_size)
64 struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
65 int new_tlv_space = TLV_SPACE(tlv_data_size);
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;
77 static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
79 struct sk_buff *buf;
80 __be32 value_net;
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));
88 return buf;
91 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
93 return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
96 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
98 struct sk_buff *buf;
99 int string_len = strlen(string) + 1;
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;
107 #define MAX_STATS_INFO 2000
109 static struct sk_buff *tipc_show_stats(void)
111 struct sk_buff *buf;
112 struct tlv_desc *rep_tlv;
113 struct print_buf pb;
114 int str_len;
115 u32 value;
117 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
118 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
120 value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
121 if (value != 0)
122 return tipc_cfg_reply_error_string("unsupported argument");
124 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_STATS_INFO));
125 if (buf == NULL)
126 return NULL;
128 rep_tlv = (struct tlv_desc *)buf->data;
129 tipc_printbuf_init(&pb, (char *)TLV_DATA(rep_tlv), MAX_STATS_INFO);
131 tipc_printf(&pb, "TIPC version " TIPC_MOD_VER "\n");
133 /* Use additional tipc_printf()'s to return more info ... */
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);
139 return buf;
142 static struct sk_buff *cfg_enable_bearer(void)
144 struct tipc_bearer_config *args;
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);
149 args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
150 if (tipc_enable_bearer(args->name,
151 ntohl(args->detect_scope),
152 ntohl(args->priority)))
153 return tipc_cfg_reply_error_string("unable to enable bearer");
155 return tipc_cfg_reply_none();
158 static struct sk_buff *cfg_disable_bearer(void)
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);
163 if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
164 return tipc_cfg_reply_error_string("unable to disable bearer");
166 return tipc_cfg_reply_none();
169 static struct sk_buff *cfg_set_own_addr(void)
171 u32 addr;
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);
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)");
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!
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.
196 spin_unlock_bh(&config_lock);
197 tipc_core_start_net(addr);
198 spin_lock_bh(&config_lock);
199 return tipc_cfg_reply_none();
202 static struct sk_buff *cfg_set_remote_mng(void)
204 u32 value;
206 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
207 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
209 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
210 tipc_remote_management = (value != 0);
211 return tipc_cfg_reply_none();
214 static struct sk_buff *cfg_set_max_publications(void)
216 u32 value;
218 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
219 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
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();
229 static struct sk_buff *cfg_set_max_subscriptions(void)
231 u32 value;
233 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
234 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
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();
244 static struct sk_buff *cfg_set_max_ports(void)
246 u32 value;
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();
263 static struct sk_buff *cfg_set_max_nodes(void)
265 u32 value;
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_max_nodes)
271 return tipc_cfg_reply_none();
272 if (value != delimit(value, 8, 2047))
273 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
274 " (max nodes must be 8-2047)");
275 if (tipc_mode == TIPC_NET_MODE)
276 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
277 " (cannot change max nodes once TIPC has joined a network)");
278 tipc_max_nodes = value;
279 return tipc_cfg_reply_none();
282 static struct sk_buff *cfg_set_netid(void)
284 u32 value;
286 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
287 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
288 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
289 if (value == tipc_net_id)
290 return tipc_cfg_reply_none();
291 if (value != delimit(value, 1, 9999))
292 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
293 " (network id must be 1-9999)");
294 if (tipc_mode == TIPC_NET_MODE)
295 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
296 " (cannot change network id once TIPC has joined a network)");
297 tipc_net_id = value;
298 return tipc_cfg_reply_none();
301 struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
302 int request_space, int reply_headroom)
304 struct sk_buff *rep_tlv_buf;
306 spin_lock_bh(&config_lock);
308 /* Save request and reply details in a well-known location */
310 req_tlv_area = request_area;
311 req_tlv_space = request_space;
312 rep_headroom = reply_headroom;
314 /* Check command authorization */
316 if (likely(orig_node == tipc_own_addr)) {
317 /* command is permitted */
318 } else if (cmd >= 0x8000) {
319 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
320 " (cannot be done remotely)");
321 goto exit;
322 } else if (!tipc_remote_management) {
323 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
324 goto exit;
325 } else if (cmd >= 0x4000) {
326 u32 domain = 0;
328 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
329 (domain != orig_node)) {
330 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
331 goto exit;
335 /* Call appropriate processing routine */
337 switch (cmd) {
338 case TIPC_CMD_NOOP:
339 rep_tlv_buf = tipc_cfg_reply_none();
340 break;
341 case TIPC_CMD_GET_NODES:
342 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
343 break;
344 case TIPC_CMD_GET_LINKS:
345 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
346 break;
347 case TIPC_CMD_SHOW_LINK_STATS:
348 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
349 break;
350 case TIPC_CMD_RESET_LINK_STATS:
351 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
352 break;
353 case TIPC_CMD_SHOW_NAME_TABLE:
354 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
355 break;
356 case TIPC_CMD_GET_BEARER_NAMES:
357 rep_tlv_buf = tipc_bearer_get_names();
358 break;
359 case TIPC_CMD_GET_MEDIA_NAMES:
360 rep_tlv_buf = tipc_media_get_names();
361 break;
362 case TIPC_CMD_SHOW_PORTS:
363 rep_tlv_buf = tipc_port_get_ports();
364 break;
365 case TIPC_CMD_SET_LOG_SIZE:
366 rep_tlv_buf = tipc_log_resize_cmd(req_tlv_area, req_tlv_space);
367 break;
368 case TIPC_CMD_DUMP_LOG:
369 rep_tlv_buf = tipc_log_dump();
370 break;
371 case TIPC_CMD_SHOW_STATS:
372 rep_tlv_buf = tipc_show_stats();
373 break;
374 case TIPC_CMD_SET_LINK_TOL:
375 case TIPC_CMD_SET_LINK_PRI:
376 case TIPC_CMD_SET_LINK_WINDOW:
377 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
378 break;
379 case TIPC_CMD_ENABLE_BEARER:
380 rep_tlv_buf = cfg_enable_bearer();
381 break;
382 case TIPC_CMD_DISABLE_BEARER:
383 rep_tlv_buf = cfg_disable_bearer();
384 break;
385 case TIPC_CMD_SET_NODE_ADDR:
386 rep_tlv_buf = cfg_set_own_addr();
387 break;
388 case TIPC_CMD_SET_REMOTE_MNG:
389 rep_tlv_buf = cfg_set_remote_mng();
390 break;
391 case TIPC_CMD_SET_MAX_PORTS:
392 rep_tlv_buf = cfg_set_max_ports();
393 break;
394 case TIPC_CMD_SET_MAX_PUBL:
395 rep_tlv_buf = cfg_set_max_publications();
396 break;
397 case TIPC_CMD_SET_MAX_SUBSCR:
398 rep_tlv_buf = cfg_set_max_subscriptions();
399 break;
400 case TIPC_CMD_SET_MAX_NODES:
401 rep_tlv_buf = cfg_set_max_nodes();
402 break;
403 case TIPC_CMD_SET_NETID:
404 rep_tlv_buf = cfg_set_netid();
405 break;
406 case TIPC_CMD_GET_REMOTE_MNG:
407 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
408 break;
409 case TIPC_CMD_GET_MAX_PORTS:
410 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
411 break;
412 case TIPC_CMD_GET_MAX_PUBL:
413 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_publications);
414 break;
415 case TIPC_CMD_GET_MAX_SUBSCR:
416 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_subscriptions);
417 break;
418 case TIPC_CMD_GET_MAX_NODES:
419 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_nodes);
420 break;
421 case TIPC_CMD_GET_NETID:
422 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
423 break;
424 case TIPC_CMD_NOT_NET_ADMIN:
425 rep_tlv_buf =
426 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
427 break;
428 case TIPC_CMD_SET_MAX_ZONES:
429 case TIPC_CMD_GET_MAX_ZONES:
430 case TIPC_CMD_SET_MAX_SLAVES:
431 case TIPC_CMD_GET_MAX_SLAVES:
432 case TIPC_CMD_SET_MAX_CLUSTERS:
433 case TIPC_CMD_GET_MAX_CLUSTERS:
434 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
435 " (obsolete command)");
436 break;
437 default:
438 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
439 " (unknown command)");
440 break;
443 /* Return reply buffer */
444 exit:
445 spin_unlock_bh(&config_lock);
446 return rep_tlv_buf;
449 static void cfg_named_msg_event(void *userdata,
450 u32 port_ref,
451 struct sk_buff **buf,
452 const unchar *msg,
453 u32 size,
454 u32 importance,
455 struct tipc_portid const *orig,
456 struct tipc_name_seq const *dest)
458 struct tipc_cfg_msg_hdr *req_hdr;
459 struct tipc_cfg_msg_hdr *rep_hdr;
460 struct sk_buff *rep_buf;
462 /* Validate configuration message header (ignore invalid message) */
464 req_hdr = (struct tipc_cfg_msg_hdr *)msg;
465 if ((size < sizeof(*req_hdr)) ||
466 (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
467 (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
468 warn("Invalid configuration message discarded\n");
469 return;
472 /* Generate reply for request (if can't, return request) */
474 rep_buf = tipc_cfg_do_cmd(orig->node,
475 ntohs(req_hdr->tcm_type),
476 msg + sizeof(*req_hdr),
477 size - sizeof(*req_hdr),
478 BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
479 if (rep_buf) {
480 skb_push(rep_buf, sizeof(*rep_hdr));
481 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
482 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
483 rep_hdr->tcm_len = htonl(rep_buf->len);
484 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
485 } else {
486 rep_buf = *buf;
487 *buf = NULL;
490 /* NEED TO ADD CODE TO HANDLE FAILED SEND (SUCH AS CONGESTION) */
491 tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
494 int tipc_cfg_init(void)
496 struct tipc_name_seq seq;
497 int res;
499 res = tipc_createport(NULL, TIPC_CRITICAL_IMPORTANCE,
500 NULL, NULL, NULL,
501 NULL, cfg_named_msg_event, NULL,
502 NULL, &config_port_ref);
503 if (res)
504 goto failed;
506 seq.type = TIPC_CFG_SRV;
507 seq.lower = seq.upper = tipc_own_addr;
508 res = tipc_nametbl_publish_rsv(config_port_ref, TIPC_ZONE_SCOPE, &seq);
509 if (res)
510 goto failed;
512 return 0;
514 failed:
515 err("Unable to create configuration service\n");
516 return res;
519 void tipc_cfg_stop(void)
521 if (config_port_ref) {
522 tipc_deleteport(config_port_ref);
523 config_port_ref = 0;