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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, 2010-2013, 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);
46
47static const void *req_tlv_area; /* request message TLV area */
48static int req_tlv_space; /* request message TLV area size */
49static int rep_headroom; /* reply message headroom to use */
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
107static struct sk_buff *tipc_show_stats(void)
108{
109 struct sk_buff *buf;
110 struct tlv_desc *rep_tlv;
111 char *pb;
112 int pb_len;
113 int str_len;
114 u32 value;
115
116 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
117 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
118
119 value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
120 if (value != 0)
121 return tipc_cfg_reply_error_string("unsupported argument");
122
123 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
124 if (buf == NULL)
125 return NULL;
126
127 rep_tlv = (struct tlv_desc *)buf->data;
128 pb = TLV_DATA(rep_tlv);
129 pb_len = ULTRA_STRING_MAX_LEN;
130
131 str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "\n");
132 str_len += 1; /* for "\0" */
133 skb_put(buf, TLV_SPACE(str_len));
134 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
135
136 return buf;
137}
138
139static struct sk_buff *cfg_enable_bearer(void)
140{
141 struct tipc_bearer_config *args;
142
143 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_CONFIG))
144 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
145
146 args = (struct tipc_bearer_config *)TLV_DATA(req_tlv_area);
147 if (tipc_enable_bearer(args->name,
148 ntohl(args->disc_domain),
149 ntohl(args->priority)))
150 return tipc_cfg_reply_error_string("unable to enable bearer");
151
152 return tipc_cfg_reply_none();
153}
154
155static struct sk_buff *cfg_disable_bearer(void)
156{
157 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_BEARER_NAME))
158 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
159
160 if (tipc_disable_bearer((char *)TLV_DATA(req_tlv_area)))
161 return tipc_cfg_reply_error_string("unable to disable bearer");
162
163 return tipc_cfg_reply_none();
164}
165
166static struct sk_buff *cfg_set_own_addr(void)
167{
168 u32 addr;
169
170 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
171 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
172
173 addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
174 if (addr == tipc_own_addr)
175 return tipc_cfg_reply_none();
176 if (!tipc_addr_node_valid(addr))
177 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
178 " (node address)");
179 if (tipc_own_addr)
180 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
181 " (cannot change node address once assigned)");
182 tipc_net_start(addr);
183 return tipc_cfg_reply_none();
184}
185
186static struct sk_buff *cfg_set_max_ports(void)
187{
188 u32 value;
189
190 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
191 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
192 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
193 if (value == tipc_max_ports)
194 return tipc_cfg_reply_none();
195 if (value < 127 || value > 65535)
196 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
197 " (max ports must be 127-65535)");
198 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
199 " (cannot change max ports while TIPC is active)");
200}
201
202static struct sk_buff *cfg_set_netid(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 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
209 if (value == tipc_net_id)
210 return tipc_cfg_reply_none();
211 if (value < 1 || value > 9999)
212 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
213 " (network id must be 1-9999)");
214 if (tipc_own_addr)
215 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
216 " (cannot change network id once TIPC has joined a network)");
217 tipc_net_id = value;
218 return tipc_cfg_reply_none();
219}
220
221struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
222 int request_space, int reply_headroom)
223{
224 struct sk_buff *rep_tlv_buf;
225
226 mutex_lock(&config_mutex);
227
228 /* Save request and reply details in a well-known location */
229 req_tlv_area = request_area;
230 req_tlv_space = request_space;
231 rep_headroom = reply_headroom;
232
233 /* Check command authorization */
234 if (likely(in_own_node(orig_node))) {
235 /* command is permitted */
236 } else {
237 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
238 " (cannot be done remotely)");
239 goto exit;
240 }
241
242 /* Call appropriate processing routine */
243 switch (cmd) {
244 case TIPC_CMD_NOOP:
245 rep_tlv_buf = tipc_cfg_reply_none();
246 break;
247 case TIPC_CMD_GET_NODES:
248 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
249 break;
250 case TIPC_CMD_GET_LINKS:
251 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
252 break;
253 case TIPC_CMD_SHOW_LINK_STATS:
254 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
255 break;
256 case TIPC_CMD_RESET_LINK_STATS:
257 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
258 break;
259 case TIPC_CMD_SHOW_NAME_TABLE:
260 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
261 break;
262 case TIPC_CMD_GET_BEARER_NAMES:
263 rep_tlv_buf = tipc_bearer_get_names();
264 break;
265 case TIPC_CMD_GET_MEDIA_NAMES:
266 rep_tlv_buf = tipc_media_get_names();
267 break;
268 case TIPC_CMD_SHOW_PORTS:
269 rep_tlv_buf = tipc_port_get_ports();
270 break;
271 case TIPC_CMD_SHOW_STATS:
272 rep_tlv_buf = tipc_show_stats();
273 break;
274 case TIPC_CMD_SET_LINK_TOL:
275 case TIPC_CMD_SET_LINK_PRI:
276 case TIPC_CMD_SET_LINK_WINDOW:
277 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
278 break;
279 case TIPC_CMD_ENABLE_BEARER:
280 rep_tlv_buf = cfg_enable_bearer();
281 break;
282 case TIPC_CMD_DISABLE_BEARER:
283 rep_tlv_buf = cfg_disable_bearer();
284 break;
285 case TIPC_CMD_SET_NODE_ADDR:
286 rep_tlv_buf = cfg_set_own_addr();
287 break;
288 case TIPC_CMD_SET_MAX_PORTS:
289 rep_tlv_buf = cfg_set_max_ports();
290 break;
291 case TIPC_CMD_SET_NETID:
292 rep_tlv_buf = cfg_set_netid();
293 break;
294 case TIPC_CMD_GET_MAX_PORTS:
295 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
296 break;
297 case TIPC_CMD_GET_NETID:
298 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
299 break;
300 case TIPC_CMD_NOT_NET_ADMIN:
301 rep_tlv_buf =
302 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
303 break;
304 case TIPC_CMD_SET_MAX_ZONES:
305 case TIPC_CMD_GET_MAX_ZONES:
306 case TIPC_CMD_SET_MAX_SLAVES:
307 case TIPC_CMD_GET_MAX_SLAVES:
308 case TIPC_CMD_SET_MAX_CLUSTERS:
309 case TIPC_CMD_GET_MAX_CLUSTERS:
310 case TIPC_CMD_SET_MAX_NODES:
311 case TIPC_CMD_GET_MAX_NODES:
312 case TIPC_CMD_SET_MAX_SUBSCR:
313 case TIPC_CMD_GET_MAX_SUBSCR:
314 case TIPC_CMD_SET_MAX_PUBL:
315 case TIPC_CMD_GET_MAX_PUBL:
316 case TIPC_CMD_SET_LOG_SIZE:
317 case TIPC_CMD_SET_REMOTE_MNG:
318 case TIPC_CMD_GET_REMOTE_MNG:
319 case TIPC_CMD_DUMP_LOG:
320 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
321 " (obsolete command)");
322 break;
323 default:
324 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
325 " (unknown command)");
326 break;
327 }
328
329 WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));
330
331 /* Append an error message if we cannot return all requested data */
332 if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
333 if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
334 sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
335 sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
336 }
337
338 /* Return reply buffer */
339exit:
340 mutex_unlock(&config_mutex);
341 return rep_tlv_buf;
342}