Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/name_distr.c: TIPC name distribution code | |
c4307285 | 3 | * |
a5325ae5 | 4 | * Copyright (c) 2000-2006, 2014, Ericsson AB |
431697eb | 5 | * Copyright (c) 2005, 2010-2011, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
b97bf3fd | 38 | #include "link.h" |
b97bf3fd PL |
39 | #include "name_distr.h" |
40 | ||
a5325ae5 EH |
41 | int sysctl_tipc_named_timeout __read_mostly = 2000; |
42 | ||
43 | /** | |
44 | * struct tipc_dist_queue - queue holding deferred name table updates | |
45 | */ | |
46 | static struct list_head tipc_dist_queue = LIST_HEAD_INIT(tipc_dist_queue); | |
47 | ||
48 | struct distr_queue_item { | |
49 | struct distr_item i; | |
50 | u32 dtype; | |
51 | u32 node; | |
52 | unsigned long expires; | |
53 | struct list_head next; | |
54 | }; | |
55 | ||
b97bf3fd PL |
56 | /** |
57 | * publ_to_item - add publication info to a publication message | |
58 | */ | |
b97bf3fd PL |
59 | static void publ_to_item(struct distr_item *i, struct publication *p) |
60 | { | |
61 | i->type = htonl(p->type); | |
62 | i->lower = htonl(p->lower); | |
63 | i->upper = htonl(p->upper); | |
64 | i->ref = htonl(p->ref); | |
65 | i->key = htonl(p->key); | |
b97bf3fd PL |
66 | } |
67 | ||
68 | /** | |
69 | * named_prepare_buf - allocate & initialize a publication message | |
70 | */ | |
34747539 YX |
71 | static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size, |
72 | u32 dest) | |
b97bf3fd | 73 | { |
c5898636 | 74 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
741d9eb7 | 75 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size); |
b97bf3fd PL |
76 | struct tipc_msg *msg; |
77 | ||
78 | if (buf != NULL) { | |
79 | msg = buf_msg(buf); | |
c5898636 JPM |
80 | tipc_msg_init(tn->own_addr, msg, NAME_DISTRIBUTOR, type, |
81 | INT_H_SIZE, dest); | |
741d9eb7 | 82 | msg_set_size(msg, INT_H_SIZE + size); |
b97bf3fd PL |
83 | } |
84 | return buf; | |
85 | } | |
86 | ||
f2f9800d | 87 | void named_cluster_distribute(struct net *net, struct sk_buff *skb) |
8f92df6a | 88 | { |
f2f9800d | 89 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a6ca1094 | 90 | struct sk_buff *oskb; |
dbdf6d24 JPM |
91 | struct tipc_node *node; |
92 | u32 dnode; | |
8f92df6a | 93 | |
6c7a762e | 94 | rcu_read_lock(); |
f2f9800d | 95 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
dbdf6d24 | 96 | dnode = node->addr; |
34747539 | 97 | if (in_own_node(net, dnode)) |
dbdf6d24 JPM |
98 | continue; |
99 | if (!tipc_node_active_links(node)) | |
100 | continue; | |
3622c36f | 101 | oskb = pskb_copy(skb, GFP_ATOMIC); |
a6ca1094 | 102 | if (!oskb) |
dbdf6d24 | 103 | break; |
a6ca1094 | 104 | msg_set_destnode(buf_msg(oskb), dnode); |
f2f9800d | 105 | tipc_link_xmit_skb(net, oskb, dnode, dnode); |
8f92df6a | 106 | } |
6c7a762e | 107 | rcu_read_unlock(); |
8f92df6a | 108 | |
a6ca1094 | 109 | kfree_skb(skb); |
8f92df6a AS |
110 | } |
111 | ||
b97bf3fd | 112 | /** |
4323add6 | 113 | * tipc_named_publish - tell other nodes about a new publication by this node |
b97bf3fd | 114 | */ |
4ac1c8d0 | 115 | struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ) |
b97bf3fd | 116 | { |
4ac1c8d0 | 117 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd PL |
118 | struct sk_buff *buf; |
119 | struct distr_item *item; | |
120 | ||
97ede29e | 121 | list_add_tail_rcu(&publ->local_list, |
4ac1c8d0 | 122 | &tn->nametbl->publ_list[publ->scope]); |
b97bf3fd | 123 | |
1110b8d3 | 124 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 125 | return NULL; |
1110b8d3 | 126 | |
34747539 | 127 | buf = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0); |
b97bf3fd | 128 | if (!buf) { |
2cf8aa19 | 129 | pr_warn("Publication distribution failure\n"); |
eab8c045 | 130 | return NULL; |
b97bf3fd PL |
131 | } |
132 | ||
133 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
134 | publ_to_item(item, publ); | |
eab8c045 | 135 | return buf; |
b97bf3fd PL |
136 | } |
137 | ||
138 | /** | |
4323add6 | 139 | * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
b97bf3fd | 140 | */ |
34747539 | 141 | struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) |
b97bf3fd PL |
142 | { |
143 | struct sk_buff *buf; | |
144 | struct distr_item *item; | |
145 | ||
146 | list_del(&publ->local_list); | |
b97bf3fd | 147 | |
1110b8d3 | 148 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 149 | return NULL; |
1110b8d3 | 150 | |
34747539 | 151 | buf = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0); |
b97bf3fd | 152 | if (!buf) { |
2cf8aa19 | 153 | pr_warn("Withdrawal distribution failure\n"); |
eab8c045 | 154 | return NULL; |
b97bf3fd PL |
155 | } |
156 | ||
157 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
158 | publ_to_item(item, publ); | |
eab8c045 | 159 | return buf; |
b97bf3fd PL |
160 | } |
161 | ||
dbdf6d24 | 162 | /** |
e11aa059 | 163 | * named_distribute - prepare name info for bulk distribution to another node |
a6ca1094 | 164 | * @list: list of messages (buffers) to be returned from this function |
dbdf6d24 JPM |
165 | * @dnode: node to be updated |
166 | * @pls: linked list of publication items to be packed into buffer chain | |
e11aa059 | 167 | */ |
f2f9800d YX |
168 | static void named_distribute(struct net *net, struct sk_buff_head *list, |
169 | u32 dnode, struct list_head *pls) | |
e11aa059 AS |
170 | { |
171 | struct publication *publ; | |
a6ca1094 | 172 | struct sk_buff *skb = NULL; |
e11aa059 | 173 | struct distr_item *item = NULL; |
f2f9800d YX |
174 | uint msg_dsz = (tipc_node_get_mtu(net, dnode, 0) / ITEM_SIZE) * |
175 | ITEM_SIZE; | |
1b61e70a | 176 | uint msg_rem = msg_dsz; |
e11aa059 | 177 | |
993bfe5d | 178 | list_for_each_entry(publ, pls, local_list) { |
dbdf6d24 | 179 | /* Prepare next buffer: */ |
a6ca1094 | 180 | if (!skb) { |
34747539 YX |
181 | skb = named_prepare_buf(net, PUBLICATION, msg_rem, |
182 | dnode); | |
a6ca1094 | 183 | if (!skb) { |
2cf8aa19 | 184 | pr_warn("Bulk publication failure\n"); |
e11aa059 AS |
185 | return; |
186 | } | |
a6ca1094 | 187 | item = (struct distr_item *)msg_data(buf_msg(skb)); |
e11aa059 | 188 | } |
dbdf6d24 JPM |
189 | |
190 | /* Pack publication into message: */ | |
e11aa059 AS |
191 | publ_to_item(item, publ); |
192 | item++; | |
dbdf6d24 JPM |
193 | msg_rem -= ITEM_SIZE; |
194 | ||
195 | /* Append full buffer to list: */ | |
196 | if (!msg_rem) { | |
a6ca1094 YX |
197 | __skb_queue_tail(list, skb); |
198 | skb = NULL; | |
1b61e70a | 199 | msg_rem = msg_dsz; |
e11aa059 AS |
200 | } |
201 | } | |
1b61e70a YX |
202 | if (skb) { |
203 | msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem)); | |
204 | skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); | |
205 | __skb_queue_tail(list, skb); | |
206 | } | |
e11aa059 AS |
207 | } |
208 | ||
b97bf3fd | 209 | /** |
4323add6 | 210 | * tipc_named_node_up - tell specified node about all publications by this node |
b97bf3fd | 211 | */ |
f2f9800d | 212 | void tipc_named_node_up(struct net *net, u32 dnode) |
b97bf3fd | 213 | { |
4ac1c8d0 | 214 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a6ca1094 YX |
215 | struct sk_buff_head head; |
216 | ||
217 | __skb_queue_head_init(&head); | |
9aa88c2a | 218 | |
97ede29e | 219 | rcu_read_lock(); |
f2f9800d | 220 | named_distribute(net, &head, dnode, |
4ac1c8d0 | 221 | &tn->nametbl->publ_list[TIPC_CLUSTER_SCOPE]); |
f2f9800d | 222 | named_distribute(net, &head, dnode, |
4ac1c8d0 | 223 | &tn->nametbl->publ_list[TIPC_ZONE_SCOPE]); |
97ede29e | 224 | rcu_read_unlock(); |
9aa88c2a | 225 | |
f2f9800d | 226 | tipc_link_xmit(net, &head, dnode, dnode); |
b97bf3fd PL |
227 | } |
228 | ||
f2f9800d YX |
229 | static void tipc_publ_subscribe(struct net *net, struct publication *publ, |
230 | u32 addr) | |
a8f48af5 YX |
231 | { |
232 | struct tipc_node *node; | |
233 | ||
34747539 | 234 | if (in_own_node(net, addr)) |
a8f48af5 YX |
235 | return; |
236 | ||
f2f9800d | 237 | node = tipc_node_find(net, addr); |
a8f48af5 YX |
238 | if (!node) { |
239 | pr_warn("Node subscription rejected, unknown node 0x%x\n", | |
240 | addr); | |
241 | return; | |
242 | } | |
243 | ||
244 | tipc_node_lock(node); | |
245 | list_add_tail(&publ->nodesub_list, &node->publ_list); | |
246 | tipc_node_unlock(node); | |
8a0f6ebe | 247 | tipc_node_put(node); |
a8f48af5 YX |
248 | } |
249 | ||
f2f9800d YX |
250 | static void tipc_publ_unsubscribe(struct net *net, struct publication *publ, |
251 | u32 addr) | |
a8f48af5 YX |
252 | { |
253 | struct tipc_node *node; | |
254 | ||
f2f9800d | 255 | node = tipc_node_find(net, addr); |
a8f48af5 YX |
256 | if (!node) |
257 | return; | |
258 | ||
259 | tipc_node_lock(node); | |
260 | list_del_init(&publ->nodesub_list); | |
261 | tipc_node_unlock(node); | |
8a0f6ebe | 262 | tipc_node_put(node); |
a8f48af5 YX |
263 | } |
264 | ||
b97bf3fd | 265 | /** |
a8f48af5 | 266 | * tipc_publ_purge - remove publication associated with a failed node |
c4307285 YH |
267 | * |
268 | * Invoked for each publication issued by a newly failed node. | |
b97bf3fd | 269 | * Removes publication structure from name table & deletes it. |
b97bf3fd | 270 | */ |
f2f9800d | 271 | static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr) |
b97bf3fd | 272 | { |
4ac1c8d0 | 273 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd | 274 | struct publication *p; |
f131072c | 275 | |
4ac1c8d0 YX |
276 | spin_lock_bh(&tn->nametbl_lock); |
277 | p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, | |
4323add6 | 278 | publ->node, publ->ref, publ->key); |
431697eb | 279 | if (p) |
f2f9800d | 280 | tipc_publ_unsubscribe(net, p, addr); |
4ac1c8d0 | 281 | spin_unlock_bh(&tn->nametbl_lock); |
f131072c | 282 | |
c4307285 | 283 | if (p != publ) { |
2cf8aa19 EH |
284 | pr_err("Unable to remove publication from failed node\n" |
285 | " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", | |
286 | publ->type, publ->lower, publ->node, publ->ref, | |
287 | publ->key); | |
f131072c AS |
288 | } |
289 | ||
97ede29e | 290 | kfree_rcu(p, rcu); |
b97bf3fd PL |
291 | } |
292 | ||
f2f9800d | 293 | void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr) |
a8f48af5 YX |
294 | { |
295 | struct publication *publ, *tmp; | |
296 | ||
297 | list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list) | |
f2f9800d | 298 | tipc_publ_purge(net, publ, addr); |
a8f48af5 YX |
299 | } |
300 | ||
f4ad8a4b EH |
301 | /** |
302 | * tipc_update_nametbl - try to process a nametable update and notify | |
303 | * subscribers | |
304 | * | |
305 | * tipc_nametbl_lock must be held. | |
306 | * Returns the publication item if successful, otherwise NULL. | |
307 | */ | |
f2f9800d YX |
308 | static bool tipc_update_nametbl(struct net *net, struct distr_item *i, |
309 | u32 node, u32 dtype) | |
f4ad8a4b EH |
310 | { |
311 | struct publication *publ = NULL; | |
312 | ||
313 | if (dtype == PUBLICATION) { | |
4ac1c8d0 YX |
314 | publ = tipc_nametbl_insert_publ(net, ntohl(i->type), |
315 | ntohl(i->lower), | |
f4ad8a4b EH |
316 | ntohl(i->upper), |
317 | TIPC_CLUSTER_SCOPE, node, | |
318 | ntohl(i->ref), ntohl(i->key)); | |
319 | if (publ) { | |
f2f9800d | 320 | tipc_publ_subscribe(net, publ, node); |
0fc4dffa | 321 | return true; |
f4ad8a4b EH |
322 | } |
323 | } else if (dtype == WITHDRAWAL) { | |
4ac1c8d0 YX |
324 | publ = tipc_nametbl_remove_publ(net, ntohl(i->type), |
325 | ntohl(i->lower), | |
f4ad8a4b EH |
326 | node, ntohl(i->ref), |
327 | ntohl(i->key)); | |
328 | if (publ) { | |
f2f9800d | 329 | tipc_publ_unsubscribe(net, publ, node); |
97ede29e | 330 | kfree_rcu(publ, rcu); |
0fc4dffa | 331 | return true; |
f4ad8a4b EH |
332 | } |
333 | } else { | |
334 | pr_warn("Unrecognized name table message received\n"); | |
335 | } | |
0fc4dffa | 336 | return false; |
f4ad8a4b EH |
337 | } |
338 | ||
a5325ae5 EH |
339 | /** |
340 | * tipc_named_add_backlog - add a failed name table update to the backlog | |
341 | * | |
342 | */ | |
343 | static void tipc_named_add_backlog(struct distr_item *i, u32 type, u32 node) | |
344 | { | |
345 | struct distr_queue_item *e; | |
346 | unsigned long now = get_jiffies_64(); | |
347 | ||
348 | e = kzalloc(sizeof(*e), GFP_ATOMIC); | |
349 | if (!e) | |
350 | return; | |
351 | e->dtype = type; | |
352 | e->node = node; | |
353 | e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout); | |
354 | memcpy(e, i, sizeof(*i)); | |
355 | list_add_tail(&e->next, &tipc_dist_queue); | |
356 | } | |
357 | ||
358 | /** | |
359 | * tipc_named_process_backlog - try to process any pending name table updates | |
360 | * from the network. | |
361 | */ | |
f2f9800d | 362 | void tipc_named_process_backlog(struct net *net) |
a5325ae5 EH |
363 | { |
364 | struct distr_queue_item *e, *tmp; | |
365 | char addr[16]; | |
366 | unsigned long now = get_jiffies_64(); | |
367 | ||
368 | list_for_each_entry_safe(e, tmp, &tipc_dist_queue, next) { | |
369 | if (time_after(e->expires, now)) { | |
f2f9800d | 370 | if (!tipc_update_nametbl(net, &e->i, e->node, e->dtype)) |
a5325ae5 EH |
371 | continue; |
372 | } else { | |
373 | tipc_addr_string_fill(addr, e->node); | |
374 | pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n", | |
375 | e->dtype, ntohl(e->i.type), | |
376 | ntohl(e->i.lower), | |
377 | ntohl(e->i.upper), | |
378 | addr, ntohl(e->i.key)); | |
379 | } | |
380 | list_del(&e->next); | |
381 | kfree(e); | |
382 | } | |
383 | } | |
384 | ||
b97bf3fd | 385 | /** |
c637c103 | 386 | * tipc_named_rcv - process name table update messages sent by another node |
b97bf3fd | 387 | */ |
c637c103 | 388 | void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq) |
b97bf3fd | 389 | { |
4ac1c8d0 | 390 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
c637c103 JPM |
391 | struct tipc_msg *msg; |
392 | struct distr_item *item; | |
393 | uint count; | |
394 | u32 node; | |
395 | struct sk_buff *skb; | |
396 | int mtype; | |
b97bf3fd | 397 | |
4ac1c8d0 | 398 | spin_lock_bh(&tn->nametbl_lock); |
c637c103 JPM |
399 | for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) { |
400 | msg = buf_msg(skb); | |
401 | mtype = msg_type(msg); | |
402 | item = (struct distr_item *)msg_data(msg); | |
403 | count = msg_data_sz(msg) / ITEM_SIZE; | |
404 | node = msg_orignode(msg); | |
405 | while (count--) { | |
406 | if (!tipc_update_nametbl(net, item, node, mtype)) | |
407 | tipc_named_add_backlog(item, mtype, node); | |
408 | item++; | |
409 | } | |
410 | kfree_skb(skb); | |
411 | tipc_named_process_backlog(net); | |
b97bf3fd | 412 | } |
4ac1c8d0 | 413 | spin_unlock_bh(&tn->nametbl_lock); |
b97bf3fd PL |
414 | } |
415 | ||
416 | /** | |
1110b8d3 | 417 | * tipc_named_reinit - re-initialize local publications |
c4307285 | 418 | * |
945af1c3 | 419 | * This routine is called whenever TIPC networking is enabled. |
1110b8d3 AS |
420 | * All name table entries published by this node are updated to reflect |
421 | * the node's new network address. | |
b97bf3fd | 422 | */ |
4ac1c8d0 | 423 | void tipc_named_reinit(struct net *net) |
b97bf3fd | 424 | { |
4ac1c8d0 | 425 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd | 426 | struct publication *publ; |
a909804f | 427 | int scope; |
b97bf3fd | 428 | |
4ac1c8d0 | 429 | spin_lock_bh(&tn->nametbl_lock); |
945af1c3 | 430 | |
1110b8d3 | 431 | for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++) |
4ac1c8d0 | 432 | list_for_each_entry_rcu(publ, &tn->nametbl->publ_list[scope], |
97ede29e | 433 | local_list) |
34747539 | 434 | publ->node = tn->own_addr; |
945af1c3 | 435 | |
4ac1c8d0 | 436 | spin_unlock_bh(&tn->nametbl_lock); |
b97bf3fd | 437 | } |