Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * net/tipc/config.c: TIPC configuration management code
3 *
4 * Copyright (c) 2002-2006, Ericsson AB
5 * Copyright (c) 2004-2007, 2010-2013, 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#include "server.h"
42
43#define REPLY_TRUNCATED "<truncated>\n"
44
45static DEFINE_MUTEX(config_mutex);
46static struct tipc_server cfgsrv;
47
48static const void *req_tlv_area; /* request message TLV area */
49static int req_tlv_space; /* request message TLV area size */
50static int rep_headroom; /* reply message headroom to use */
51
52
53struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
54{
55 struct sk_buff *buf;
56
57 buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
58 if (buf)
59 skb_reserve(buf, rep_headroom);
60 return buf;
61}
62
63int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
64 void *tlv_data, int tlv_data_size)
65{
66 struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
67 int new_tlv_space = TLV_SPACE(tlv_data_size);
68
69 if (skb_tailroom(buf) < new_tlv_space)
70 return 0;
71 skb_put(buf, new_tlv_space);
72 tlv->tlv_type = htons(tlv_type);
73 tlv->tlv_len = htons(TLV_LENGTH(tlv_data_size));
74 if (tlv_data_size && tlv_data)
75 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
76 return 1;
77}
78
79static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
80{
81 struct sk_buff *buf;
82 __be32 value_net;
83
84 buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
85 if (buf) {
86 value_net = htonl(value);
87 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
88 sizeof(value_net));
89 }
90 return buf;
91}
92
93static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
94{
95 return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
96}
97
98struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
99{
100 struct sk_buff *buf;
101 int string_len = strlen(string) + 1;
102
103 buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
104 if (buf)
105 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
106 return buf;
107}
108
109static struct sk_buff *tipc_show_stats(void)
110{
111 struct sk_buff *buf;
112 struct tlv_desc *rep_tlv;
113 char *pb;
114 int pb_len;
115 int str_len;
116 u32 value;
117
118 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
119 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
120
121 value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
122 if (value != 0)
123 return tipc_cfg_reply_error_string("unsupported argument");
124
125 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
126 if (buf == NULL)
127 return NULL;
128
129 rep_tlv = (struct tlv_desc *)buf->data;
130 pb = TLV_DATA(rep_tlv);
131 pb_len = ULTRA_STRING_MAX_LEN;
132
133 str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "\n");
134 str_len += 1; /* for "\0" */
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 tipc_core_start_net(addr);
185 return tipc_cfg_reply_none();
186}
187
188static struct sk_buff *cfg_set_remote_mng(void)
189{
190 u32 value;
191
192 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
193 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
194
195 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
196 tipc_remote_management = (value != 0);
197 return tipc_cfg_reply_none();
198}
199
200static struct sk_buff *cfg_set_max_ports(void)
201{
202 u32 value;
203
204 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
205 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
206 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
207 if (value == tipc_max_ports)
208 return tipc_cfg_reply_none();
209 if (value < 127 || value > 65535)
210 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
211 " (max ports must be 127-65535)");
212 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
213 " (cannot change max ports while TIPC is active)");
214}
215
216static struct sk_buff *cfg_set_netid(void)
217{
218 u32 value;
219
220 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
221 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
222 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
223 if (value == tipc_net_id)
224 return tipc_cfg_reply_none();
225 if (value < 1 || value > 9999)
226 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
227 " (network id must be 1-9999)");
228 if (tipc_own_addr)
229 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
230 " (cannot change network id once TIPC has joined a network)");
231 tipc_net_id = value;
232 return tipc_cfg_reply_none();
233}
234
235struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
236 int request_space, int reply_headroom)
237{
238 struct sk_buff *rep_tlv_buf;
239
240 mutex_lock(&config_mutex);
241
242 /* Save request and reply details in a well-known location */
243 req_tlv_area = request_area;
244 req_tlv_space = request_space;
245 rep_headroom = reply_headroom;
246
247 /* Check command authorization */
248 if (likely(in_own_node(orig_node))) {
249 /* command is permitted */
250 } else if (cmd >= 0x8000) {
251 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
252 " (cannot be done remotely)");
253 goto exit;
254 } else if (!tipc_remote_management) {
255 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
256 goto exit;
257 } else if (cmd >= 0x4000) {
258 u32 domain = 0;
259
260 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
261 (domain != orig_node)) {
262 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
263 goto exit;
264 }
265 }
266
267 /* Call appropriate processing routine */
268 switch (cmd) {
269 case TIPC_CMD_NOOP:
270 rep_tlv_buf = tipc_cfg_reply_none();
271 break;
272 case TIPC_CMD_GET_NODES:
273 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
274 break;
275 case TIPC_CMD_GET_LINKS:
276 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
277 break;
278 case TIPC_CMD_SHOW_LINK_STATS:
279 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
280 break;
281 case TIPC_CMD_RESET_LINK_STATS:
282 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
283 break;
284 case TIPC_CMD_SHOW_NAME_TABLE:
285 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
286 break;
287 case TIPC_CMD_GET_BEARER_NAMES:
288 rep_tlv_buf = tipc_bearer_get_names();
289 break;
290 case TIPC_CMD_GET_MEDIA_NAMES:
291 rep_tlv_buf = tipc_media_get_names();
292 break;
293 case TIPC_CMD_SHOW_PORTS:
294 rep_tlv_buf = tipc_port_get_ports();
295 break;
296 case TIPC_CMD_SHOW_STATS:
297 rep_tlv_buf = tipc_show_stats();
298 break;
299 case TIPC_CMD_SET_LINK_TOL:
300 case TIPC_CMD_SET_LINK_PRI:
301 case TIPC_CMD_SET_LINK_WINDOW:
302 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
303 break;
304 case TIPC_CMD_ENABLE_BEARER:
305 rep_tlv_buf = cfg_enable_bearer();
306 break;
307 case TIPC_CMD_DISABLE_BEARER:
308 rep_tlv_buf = cfg_disable_bearer();
309 break;
310 case TIPC_CMD_SET_NODE_ADDR:
311 rep_tlv_buf = cfg_set_own_addr();
312 break;
313 case TIPC_CMD_SET_REMOTE_MNG:
314 rep_tlv_buf = cfg_set_remote_mng();
315 break;
316 case TIPC_CMD_SET_MAX_PORTS:
317 rep_tlv_buf = cfg_set_max_ports();
318 break;
319 case TIPC_CMD_SET_NETID:
320 rep_tlv_buf = cfg_set_netid();
321 break;
322 case TIPC_CMD_GET_REMOTE_MNG:
323 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
324 break;
325 case TIPC_CMD_GET_MAX_PORTS:
326 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
327 break;
328 case TIPC_CMD_GET_NETID:
329 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
330 break;
331 case TIPC_CMD_NOT_NET_ADMIN:
332 rep_tlv_buf =
333 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
334 break;
335 case TIPC_CMD_SET_MAX_ZONES:
336 case TIPC_CMD_GET_MAX_ZONES:
337 case TIPC_CMD_SET_MAX_SLAVES:
338 case TIPC_CMD_GET_MAX_SLAVES:
339 case TIPC_CMD_SET_MAX_CLUSTERS:
340 case TIPC_CMD_GET_MAX_CLUSTERS:
341 case TIPC_CMD_SET_MAX_NODES:
342 case TIPC_CMD_GET_MAX_NODES:
343 case TIPC_CMD_SET_MAX_SUBSCR:
344 case TIPC_CMD_GET_MAX_SUBSCR:
345 case TIPC_CMD_SET_MAX_PUBL:
346 case TIPC_CMD_GET_MAX_PUBL:
347 case TIPC_CMD_SET_LOG_SIZE:
348 case TIPC_CMD_DUMP_LOG:
349 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
350 " (obsolete command)");
351 break;
352 default:
353 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
354 " (unknown command)");
355 break;
356 }
357
358 WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));
359
360 /* Append an error message if we cannot return all requested data */
361 if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
362 if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
363 sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
364 sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
365 }
366
367 /* Return reply buffer */
368exit:
369 mutex_unlock(&config_mutex);
370 return rep_tlv_buf;
371}
372
373static void cfg_conn_msg_event(int conid, struct sockaddr_tipc *addr,
374 void *usr_data, void *buf, size_t len)
375{
376 struct tipc_cfg_msg_hdr *req_hdr;
377 struct tipc_cfg_msg_hdr *rep_hdr;
378 struct sk_buff *rep_buf;
379 int ret;
380
381 /* Validate configuration message header (ignore invalid message) */
382 req_hdr = (struct tipc_cfg_msg_hdr *)buf;
383 if ((len < sizeof(*req_hdr)) ||
384 (len != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
385 (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
386 pr_warn("Invalid configuration message discarded\n");
387 return;
388 }
389
390 /* Generate reply for request (if can't, return request) */
391 rep_buf = tipc_cfg_do_cmd(addr->addr.id.node, ntohs(req_hdr->tcm_type),
392 buf + sizeof(*req_hdr),
393 len - sizeof(*req_hdr),
394 BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
395 if (rep_buf) {
396 skb_push(rep_buf, sizeof(*rep_hdr));
397 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
398 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
399 rep_hdr->tcm_len = htonl(rep_buf->len);
400 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
401
402 ret = tipc_conn_sendmsg(&cfgsrv, conid, addr, rep_buf->data,
403 rep_buf->len);
404 if (ret < 0)
405 pr_err("Sending cfg reply message failed, no memory\n");
406
407 kfree_skb(rep_buf);
408 }
409}
410
411static struct sockaddr_tipc cfgsrv_addr __read_mostly = {
412 .family = AF_TIPC,
413 .addrtype = TIPC_ADDR_NAMESEQ,
414 .addr.nameseq.type = TIPC_CFG_SRV,
415 .addr.nameseq.lower = 0,
416 .addr.nameseq.upper = 0,
417 .scope = TIPC_ZONE_SCOPE
418};
419
420static struct tipc_server cfgsrv __read_mostly = {
421 .saddr = &cfgsrv_addr,
422 .imp = TIPC_CRITICAL_IMPORTANCE,
423 .type = SOCK_RDM,
424 .max_rcvbuf_size = 64 * 1024,
425 .name = "cfg_server",
426 .tipc_conn_recvmsg = cfg_conn_msg_event,
427 .tipc_conn_new = NULL,
428 .tipc_conn_shutdown = NULL
429};
430
431int tipc_cfg_init(void)
432{
433 return tipc_server_start(&cfgsrv);
434}
435
436void tipc_cfg_reinit(void)
437{
438 tipc_server_stop(&cfgsrv);
439
440 cfgsrv_addr.addr.nameseq.lower = tipc_own_addr;
441 cfgsrv_addr.addr.nameseq.upper = tipc_own_addr;
442 tipc_server_start(&cfgsrv);
443}
444
445void tipc_cfg_stop(void)
446{
447 tipc_server_stop(&cfgsrv);
448}