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37#include "core.h"
38#include "port.h"
39#include "name_table.h"
40#include "config.h"
41
42#define REPLY_TRUNCATED "<truncated>\n"
43
44static u32 config_port_ref;
45
46static DEFINE_SPINLOCK(config_lock);
47
48static const void *req_tlv_area;
49static int req_tlv_space;
50static int rep_headroom;
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;
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
185
186
187
188
189
190
191
192
193 spin_unlock_bh(&config_lock);
194 tipc_core_start_net(addr);
195 spin_lock_bh(&config_lock);
196 return tipc_cfg_reply_none();
197}
198
199static struct sk_buff *cfg_set_remote_mng(void)
200{
201 u32 value;
202
203 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
204 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
205
206 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
207 tipc_remote_management = (value != 0);
208 return tipc_cfg_reply_none();
209}
210
211static struct sk_buff *cfg_set_max_ports(void)
212{
213 u32 value;
214
215 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
216 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
217 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
218 if (value == tipc_max_ports)
219 return tipc_cfg_reply_none();
220 if (value < 127 || value > 65535)
221 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
222 " (max ports must be 127-65535)");
223 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
224 " (cannot change max ports while TIPC is active)");
225}
226
227static struct sk_buff *cfg_set_netid(void)
228{
229 u32 value;
230
231 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_UNSIGNED))
232 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
233 value = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
234 if (value == tipc_net_id)
235 return tipc_cfg_reply_none();
236 if (value < 1 || value > 9999)
237 return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
238 " (network id must be 1-9999)");
239 if (tipc_own_addr)
240 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
241 " (cannot change network id once TIPC has joined a network)");
242 tipc_net_id = value;
243 return tipc_cfg_reply_none();
244}
245
246struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area,
247 int request_space, int reply_headroom)
248{
249 struct sk_buff *rep_tlv_buf;
250
251 spin_lock_bh(&config_lock);
252
253
254 req_tlv_area = request_area;
255 req_tlv_space = request_space;
256 rep_headroom = reply_headroom;
257
258
259 if (likely(in_own_node(orig_node))) {
260
261 } else if (cmd >= 0x8000) {
262 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
263 " (cannot be done remotely)");
264 goto exit;
265 } else if (!tipc_remote_management) {
266 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NO_REMOTE);
267 goto exit;
268 } else if (cmd >= 0x4000) {
269 u32 domain = 0;
270
271 if ((tipc_nametbl_translate(TIPC_ZM_SRV, 0, &domain) == 0) ||
272 (domain != orig_node)) {
273 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_ZONE_MSTR);
274 goto exit;
275 }
276 }
277
278
279 switch (cmd) {
280 case TIPC_CMD_NOOP:
281 rep_tlv_buf = tipc_cfg_reply_none();
282 break;
283 case TIPC_CMD_GET_NODES:
284 rep_tlv_buf = tipc_node_get_nodes(req_tlv_area, req_tlv_space);
285 break;
286 case TIPC_CMD_GET_LINKS:
287 rep_tlv_buf = tipc_node_get_links(req_tlv_area, req_tlv_space);
288 break;
289 case TIPC_CMD_SHOW_LINK_STATS:
290 rep_tlv_buf = tipc_link_cmd_show_stats(req_tlv_area, req_tlv_space);
291 break;
292 case TIPC_CMD_RESET_LINK_STATS:
293 rep_tlv_buf = tipc_link_cmd_reset_stats(req_tlv_area, req_tlv_space);
294 break;
295 case TIPC_CMD_SHOW_NAME_TABLE:
296 rep_tlv_buf = tipc_nametbl_get(req_tlv_area, req_tlv_space);
297 break;
298 case TIPC_CMD_GET_BEARER_NAMES:
299 rep_tlv_buf = tipc_bearer_get_names();
300 break;
301 case TIPC_CMD_GET_MEDIA_NAMES:
302 rep_tlv_buf = tipc_media_get_names();
303 break;
304 case TIPC_CMD_SHOW_PORTS:
305 rep_tlv_buf = tipc_port_get_ports();
306 break;
307 case TIPC_CMD_SHOW_STATS:
308 rep_tlv_buf = tipc_show_stats();
309 break;
310 case TIPC_CMD_SET_LINK_TOL:
311 case TIPC_CMD_SET_LINK_PRI:
312 case TIPC_CMD_SET_LINK_WINDOW:
313 rep_tlv_buf = tipc_link_cmd_config(req_tlv_area, req_tlv_space, cmd);
314 break;
315 case TIPC_CMD_ENABLE_BEARER:
316 rep_tlv_buf = cfg_enable_bearer();
317 break;
318 case TIPC_CMD_DISABLE_BEARER:
319 rep_tlv_buf = cfg_disable_bearer();
320 break;
321 case TIPC_CMD_SET_NODE_ADDR:
322 rep_tlv_buf = cfg_set_own_addr();
323 break;
324 case TIPC_CMD_SET_REMOTE_MNG:
325 rep_tlv_buf = cfg_set_remote_mng();
326 break;
327 case TIPC_CMD_SET_MAX_PORTS:
328 rep_tlv_buf = cfg_set_max_ports();
329 break;
330 case TIPC_CMD_SET_NETID:
331 rep_tlv_buf = cfg_set_netid();
332 break;
333 case TIPC_CMD_GET_REMOTE_MNG:
334 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_remote_management);
335 break;
336 case TIPC_CMD_GET_MAX_PORTS:
337 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_max_ports);
338 break;
339 case TIPC_CMD_GET_NETID:
340 rep_tlv_buf = tipc_cfg_reply_unsigned(tipc_net_id);
341 break;
342 case TIPC_CMD_NOT_NET_ADMIN:
343 rep_tlv_buf =
344 tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
345 break;
346 case TIPC_CMD_SET_MAX_ZONES:
347 case TIPC_CMD_GET_MAX_ZONES:
348 case TIPC_CMD_SET_MAX_SLAVES:
349 case TIPC_CMD_GET_MAX_SLAVES:
350 case TIPC_CMD_SET_MAX_CLUSTERS:
351 case TIPC_CMD_GET_MAX_CLUSTERS:
352 case TIPC_CMD_SET_MAX_NODES:
353 case TIPC_CMD_GET_MAX_NODES:
354 case TIPC_CMD_SET_MAX_SUBSCR:
355 case TIPC_CMD_GET_MAX_SUBSCR:
356 case TIPC_CMD_SET_MAX_PUBL:
357 case TIPC_CMD_GET_MAX_PUBL:
358 case TIPC_CMD_SET_LOG_SIZE:
359 case TIPC_CMD_DUMP_LOG:
360 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
361 " (obsolete command)");
362 break;
363 default:
364 rep_tlv_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
365 " (unknown command)");
366 break;
367 }
368
369 WARN_ON(rep_tlv_buf->len > TLV_SPACE(ULTRA_STRING_MAX_LEN));
370
371
372 if (rep_tlv_buf->len == TLV_SPACE(ULTRA_STRING_MAX_LEN)) {
373 if (*(rep_tlv_buf->data + ULTRA_STRING_MAX_LEN) != '\0')
374 sprintf(rep_tlv_buf->data + rep_tlv_buf->len -
375 sizeof(REPLY_TRUNCATED) - 1, REPLY_TRUNCATED);
376 }
377
378
379exit:
380 spin_unlock_bh(&config_lock);
381 return rep_tlv_buf;
382}
383
384static void cfg_named_msg_event(void *userdata,
385 u32 port_ref,
386 struct sk_buff **buf,
387 const unchar *msg,
388 u32 size,
389 u32 importance,
390 struct tipc_portid const *orig,
391 struct tipc_name_seq const *dest)
392{
393 struct tipc_cfg_msg_hdr *req_hdr;
394 struct tipc_cfg_msg_hdr *rep_hdr;
395 struct sk_buff *rep_buf;
396
397
398 req_hdr = (struct tipc_cfg_msg_hdr *)msg;
399 if ((size < sizeof(*req_hdr)) ||
400 (size != TCM_ALIGN(ntohl(req_hdr->tcm_len))) ||
401 (ntohs(req_hdr->tcm_flags) != TCM_F_REQUEST)) {
402 pr_warn("Invalid configuration message discarded\n");
403 return;
404 }
405
406
407 rep_buf = tipc_cfg_do_cmd(orig->node,
408 ntohs(req_hdr->tcm_type),
409 msg + sizeof(*req_hdr),
410 size - sizeof(*req_hdr),
411 BUF_HEADROOM + MAX_H_SIZE + sizeof(*rep_hdr));
412 if (rep_buf) {
413 skb_push(rep_buf, sizeof(*rep_hdr));
414 rep_hdr = (struct tipc_cfg_msg_hdr *)rep_buf->data;
415 memcpy(rep_hdr, req_hdr, sizeof(*rep_hdr));
416 rep_hdr->tcm_len = htonl(rep_buf->len);
417 rep_hdr->tcm_flags &= htons(~TCM_F_REQUEST);
418 } else {
419 rep_buf = *buf;
420 *buf = NULL;
421 }
422
423
424 tipc_send_buf2port(port_ref, orig, rep_buf, rep_buf->len);
425}
426
427int tipc_cfg_init(void)
428{
429 struct tipc_name_seq seq;
430 int res;
431
432 res = tipc_createport(NULL, TIPC_CRITICAL_IMPORTANCE,
433 NULL, NULL, NULL,
434 NULL, cfg_named_msg_event, NULL,
435 NULL, &config_port_ref);
436 if (res)
437 goto failed;
438
439 seq.type = TIPC_CFG_SRV;
440 seq.lower = seq.upper = tipc_own_addr;
441 res = tipc_publish(config_port_ref, TIPC_ZONE_SCOPE, &seq);
442 if (res)
443 goto failed;
444
445 return 0;
446
447failed:
448 pr_err("Unable to create configuration service\n");
449 return res;
450}
451
452void tipc_cfg_reinit(void)
453{
454 struct tipc_name_seq seq;
455 int res;
456
457 seq.type = TIPC_CFG_SRV;
458 seq.lower = seq.upper = 0;
459 tipc_withdraw(config_port_ref, TIPC_ZONE_SCOPE, &seq);
460
461 seq.lower = seq.upper = tipc_own_addr;
462 res = tipc_publish(config_port_ref, TIPC_ZONE_SCOPE, &seq);
463 if (res)
464 pr_err("Unable to reinitialize configuration service\n");
465}
466
467void tipc_cfg_stop(void)
468{
469 tipc_deleteport(config_port_ref);
470 config_port_ref = 0;
471}
472
