2 * net/tipc/config.c: TIPC configuration management code
4 * Copyright (c) 2002-2006, Ericsson AB
5 * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
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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"
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34 * POSSIBILITY OF SUCH DAMAGE.
39 #include "name_table.h"
43 #define REPLY_TRUNCATED "<truncated>\n"
45 static const void *req_tlv_area; /* request message TLV area */
46 static int req_tlv_space; /* request message TLV area size */
47 static int rep_headroom; /* reply message headroom to use */
49 struct sk_buff *tipc_cfg_reply_alloc(int payload_size)
53 buf = alloc_skb(rep_headroom + payload_size, GFP_ATOMIC);
55 skb_reserve(buf, rep_headroom);
59 int tipc_cfg_append_tlv(struct sk_buff *buf, int tlv_type,
60 void *tlv_data, int tlv_data_size)
62 struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(buf);
63 int new_tlv_space = TLV_SPACE(tlv_data_size);
65 if (skb_tailroom(buf) < new_tlv_space)
67 skb_put(buf, new_tlv_space);
68 tlv->tlv_type = htons(tlv_type);
69 tlv->tlv_len = htons(TLV_LENGTH(tlv_data_size));
70 if (tlv_data_size && tlv_data)
71 memcpy(TLV_DATA(tlv), tlv_data, tlv_data_size);
75 static struct sk_buff *tipc_cfg_reply_unsigned_type(u16 tlv_type, u32 value)
80 buf = tipc_cfg_reply_alloc(TLV_SPACE(sizeof(value)));
82 value_net = htonl(value);
83 tipc_cfg_append_tlv(buf, tlv_type, &value_net,
89 static struct sk_buff *tipc_cfg_reply_unsigned(u32 value)
91 return tipc_cfg_reply_unsigned_type(TIPC_TLV_UNSIGNED, value);
94 struct sk_buff *tipc_cfg_reply_string_type(u16 tlv_type, char *string)
97 int string_len = strlen(string) + 1;
99 buf = tipc_cfg_reply_alloc(TLV_SPACE(string_len));
101 tipc_cfg_append_tlv(buf, tlv_type, string, string_len);
105 static struct sk_buff *tipc_show_stats(void)
108 struct tlv_desc *rep_tlv;
114 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
115 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
117 value = ntohl(*(u32 *)TLV_DATA(req_tlv_area));
119 return tipc_cfg_reply_error_string("unsupported argument");
121 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
125 rep_tlv = (struct tlv_desc *)buf->data;
126 pb = TLV_DATA(rep_tlv);
127 pb_len = ULTRA_STRING_MAX_LEN;
129 str_len = tipc_snprintf(pb, pb_len, "TIPC version " TIPC_MOD_VER "\n");
130 str_len += 1; /* for "\0" */
131 skb_put(buf, TLV_SPACE(str_len));
132 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
137 static struct sk_buff *cfg_set_own_addr(struct net *net)
139 struct tipc_net *tn = net_generic(net, tipc_net_id);
142 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
143 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
145 addr = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
146 if (addr == tn->own_addr)
147 return tipc_cfg_reply_none();
148 if (!tipc_addr_node_valid(addr))
149 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
152 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
153 " (cannot change node address once assigned)");
154 if (!tipc_net_start(net, addr))
155 return tipc_cfg_reply_none();
157 return tipc_cfg_reply_error_string("cannot change to network mode");
160 static struct sk_buff *cfg_set_netid(struct net *net)
162 struct tipc_net *tn = net_generic(net, tipc_net_id);
165 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
166 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
167 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
168 if (value == tn->net_id)
169 return tipc_cfg_reply_none();
170 if (value < 1 || value > 9999)
171 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
172 " (network id must be 1-9999)");
174 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
175 " (cannot change network id once TIPC has joined a network)");
177 return tipc_cfg_reply_none();
180 struct sk_buff *tipc_cfg_do_cmd(struct net *net, u32 orig_node, u16 cmd,
181 const void *request_area, int request_space,
184 struct sk_buff *rep_tlv_buf;
185 struct tipc_net *tn = net_generic(net, tipc_net_id);
189 /* Save request and reply details in a well-known location */
190 req_tlv_area = request_area;
191 req_tlv_space = request_space;
192 rep_headroom = reply_headroom;
194 /* Check command authorization */
195 if (likely(in_own_node(net, orig_node))) {
196 /* command is permitted */
198 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
199 " (cannot be done remotely)");
203 /* Call appropriate processing routine */
206 rep_tlv_buf = tipc_cfg_reply_none();
208 case TIPC_CMD_GET_NODES:
209 rep_tlv_buf = tipc_node_get_nodes(net, req_tlv_area,
212 case TIPC_CMD_GET_MEDIA_NAMES:
213 rep_tlv_buf = tipc_media_get_names();
215 case TIPC_CMD_SHOW_PORTS:
216 rep_tlv_buf = tipc_sk_socks_show(net);
218 case TIPC_CMD_SHOW_STATS:
219 rep_tlv_buf = tipc_show_stats();
221 case TIPC_CMD_SET_NODE_ADDR:
222 rep_tlv_buf = cfg_set_own_addr(net);
224 case TIPC_CMD_SET_NETID:
225 rep_tlv_buf = cfg_set_netid(net);
227 case TIPC_CMD_GET_NETID:
228 rep_tlv_buf = tipc_cfg_reply_unsigned(tn->net_id);
230 case TIPC_CMD_NOT_NET_ADMIN:
232 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
234 case TIPC_CMD_SET_MAX_ZONES:
235 case TIPC_CMD_GET_MAX_ZONES:
236 case TIPC_CMD_SET_MAX_SLAVES:
237 case TIPC_CMD_GET_MAX_SLAVES:
238 case TIPC_CMD_SET_MAX_CLUSTERS:
239 case TIPC_CMD_GET_MAX_CLUSTERS:
240 case TIPC_CMD_SET_MAX_NODES:
241 case TIPC_CMD_GET_MAX_NODES:
242 case TIPC_CMD_SET_MAX_SUBSCR:
243 case TIPC_CMD_GET_MAX_SUBSCR:
244 case TIPC_CMD_SET_MAX_PUBL:
245 case TIPC_CMD_GET_MAX_PUBL:
246 case TIPC_CMD_SET_LOG_SIZE:
247 case TIPC_CMD_SET_REMOTE_MNG:
248 case TIPC_CMD_GET_REMOTE_MNG:
249 case TIPC_CMD_DUMP_LOG:
250 case TIPC_CMD_SET_MAX_PORTS:
251 case TIPC_CMD_GET_MAX_PORTS:
252 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
253 " (obsolete command)");
256 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
257 " (unknown command)");
261 WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));
263 /* Append an error message if we cannot return all requested data */
264 if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
265 if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
266 sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
267 sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
270 /* Return reply buffer */