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 | */ | |
b97bf3fd PL |
71 | static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest) |
72 | { | |
741d9eb7 | 73 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size); |
b97bf3fd PL |
74 | struct tipc_msg *msg; |
75 | ||
76 | if (buf != NULL) { | |
77 | msg = buf_msg(buf); | |
741d9eb7 AS |
78 | tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest); |
79 | msg_set_size(msg, INT_H_SIZE + size); | |
b97bf3fd PL |
80 | } |
81 | return buf; | |
82 | } | |
83 | ||
f2f9800d | 84 | void named_cluster_distribute(struct net *net, struct sk_buff *skb) |
8f92df6a | 85 | { |
f2f9800d | 86 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a6ca1094 | 87 | struct sk_buff *oskb; |
dbdf6d24 JPM |
88 | struct tipc_node *node; |
89 | u32 dnode; | |
8f92df6a | 90 | |
6c7a762e | 91 | rcu_read_lock(); |
f2f9800d | 92 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
dbdf6d24 JPM |
93 | dnode = node->addr; |
94 | if (in_own_node(dnode)) | |
95 | continue; | |
96 | if (!tipc_node_active_links(node)) | |
97 | continue; | |
a6ca1094 YX |
98 | oskb = skb_copy(skb, GFP_ATOMIC); |
99 | if (!oskb) | |
dbdf6d24 | 100 | break; |
a6ca1094 | 101 | msg_set_destnode(buf_msg(oskb), dnode); |
f2f9800d | 102 | tipc_link_xmit_skb(net, oskb, dnode, dnode); |
8f92df6a | 103 | } |
6c7a762e | 104 | rcu_read_unlock(); |
8f92df6a | 105 | |
a6ca1094 | 106 | kfree_skb(skb); |
8f92df6a AS |
107 | } |
108 | ||
b97bf3fd | 109 | /** |
4323add6 | 110 | * tipc_named_publish - tell other nodes about a new publication by this node |
b97bf3fd | 111 | */ |
eab8c045 | 112 | struct sk_buff *tipc_named_publish(struct publication *publ) |
b97bf3fd PL |
113 | { |
114 | struct sk_buff *buf; | |
115 | struct distr_item *item; | |
116 | ||
97ede29e YX |
117 | list_add_tail_rcu(&publ->local_list, |
118 | &tipc_nametbl->publ_list[publ->scope]); | |
b97bf3fd | 119 | |
1110b8d3 | 120 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 121 | return NULL; |
1110b8d3 | 122 | |
b97bf3fd PL |
123 | buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0); |
124 | if (!buf) { | |
2cf8aa19 | 125 | pr_warn("Publication distribution failure\n"); |
eab8c045 | 126 | return NULL; |
b97bf3fd PL |
127 | } |
128 | ||
129 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
130 | publ_to_item(item, publ); | |
eab8c045 | 131 | return buf; |
b97bf3fd PL |
132 | } |
133 | ||
134 | /** | |
4323add6 | 135 | * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
b97bf3fd | 136 | */ |
eab8c045 | 137 | struct sk_buff *tipc_named_withdraw(struct publication *publ) |
b97bf3fd PL |
138 | { |
139 | struct sk_buff *buf; | |
140 | struct distr_item *item; | |
141 | ||
142 | list_del(&publ->local_list); | |
b97bf3fd | 143 | |
1110b8d3 | 144 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 145 | return NULL; |
1110b8d3 | 146 | |
b97bf3fd PL |
147 | buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0); |
148 | if (!buf) { | |
2cf8aa19 | 149 | pr_warn("Withdrawal distribution failure\n"); |
eab8c045 | 150 | return NULL; |
b97bf3fd PL |
151 | } |
152 | ||
153 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
154 | publ_to_item(item, publ); | |
eab8c045 | 155 | return buf; |
b97bf3fd PL |
156 | } |
157 | ||
dbdf6d24 | 158 | /** |
e11aa059 | 159 | * named_distribute - prepare name info for bulk distribution to another node |
a6ca1094 | 160 | * @list: list of messages (buffers) to be returned from this function |
dbdf6d24 JPM |
161 | * @dnode: node to be updated |
162 | * @pls: linked list of publication items to be packed into buffer chain | |
e11aa059 | 163 | */ |
f2f9800d YX |
164 | static void named_distribute(struct net *net, struct sk_buff_head *list, |
165 | u32 dnode, struct list_head *pls) | |
e11aa059 AS |
166 | { |
167 | struct publication *publ; | |
a6ca1094 | 168 | struct sk_buff *skb = NULL; |
e11aa059 | 169 | struct distr_item *item = NULL; |
f2f9800d YX |
170 | uint msg_dsz = (tipc_node_get_mtu(net, dnode, 0) / ITEM_SIZE) * |
171 | ITEM_SIZE; | |
1b61e70a | 172 | uint msg_rem = msg_dsz; |
e11aa059 | 173 | |
993bfe5d | 174 | list_for_each_entry(publ, pls, local_list) { |
dbdf6d24 | 175 | /* Prepare next buffer: */ |
a6ca1094 | 176 | if (!skb) { |
a6ca1094 YX |
177 | skb = named_prepare_buf(PUBLICATION, msg_rem, dnode); |
178 | if (!skb) { | |
2cf8aa19 | 179 | pr_warn("Bulk publication failure\n"); |
e11aa059 AS |
180 | return; |
181 | } | |
a6ca1094 | 182 | item = (struct distr_item *)msg_data(buf_msg(skb)); |
e11aa059 | 183 | } |
dbdf6d24 JPM |
184 | |
185 | /* Pack publication into message: */ | |
e11aa059 AS |
186 | publ_to_item(item, publ); |
187 | item++; | |
dbdf6d24 JPM |
188 | msg_rem -= ITEM_SIZE; |
189 | ||
190 | /* Append full buffer to list: */ | |
191 | if (!msg_rem) { | |
a6ca1094 YX |
192 | __skb_queue_tail(list, skb); |
193 | skb = NULL; | |
1b61e70a | 194 | msg_rem = msg_dsz; |
e11aa059 AS |
195 | } |
196 | } | |
1b61e70a YX |
197 | if (skb) { |
198 | msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem)); | |
199 | skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); | |
200 | __skb_queue_tail(list, skb); | |
201 | } | |
e11aa059 AS |
202 | } |
203 | ||
b97bf3fd | 204 | /** |
4323add6 | 205 | * tipc_named_node_up - tell specified node about all publications by this node |
b97bf3fd | 206 | */ |
f2f9800d | 207 | void tipc_named_node_up(struct net *net, u32 dnode) |
b97bf3fd | 208 | { |
a6ca1094 YX |
209 | struct sk_buff_head head; |
210 | ||
211 | __skb_queue_head_init(&head); | |
9aa88c2a | 212 | |
97ede29e | 213 | rcu_read_lock(); |
f2f9800d | 214 | named_distribute(net, &head, dnode, |
993bfe5d | 215 | &tipc_nametbl->publ_list[TIPC_CLUSTER_SCOPE]); |
f2f9800d | 216 | named_distribute(net, &head, dnode, |
993bfe5d | 217 | &tipc_nametbl->publ_list[TIPC_ZONE_SCOPE]); |
97ede29e | 218 | rcu_read_unlock(); |
9aa88c2a | 219 | |
f2f9800d | 220 | tipc_link_xmit(net, &head, dnode, dnode); |
b97bf3fd PL |
221 | } |
222 | ||
f2f9800d YX |
223 | static void tipc_publ_subscribe(struct net *net, struct publication *publ, |
224 | u32 addr) | |
a8f48af5 YX |
225 | { |
226 | struct tipc_node *node; | |
227 | ||
228 | if (in_own_node(addr)) | |
229 | return; | |
230 | ||
f2f9800d | 231 | node = tipc_node_find(net, addr); |
a8f48af5 YX |
232 | if (!node) { |
233 | pr_warn("Node subscription rejected, unknown node 0x%x\n", | |
234 | addr); | |
235 | return; | |
236 | } | |
237 | ||
238 | tipc_node_lock(node); | |
239 | list_add_tail(&publ->nodesub_list, &node->publ_list); | |
240 | tipc_node_unlock(node); | |
241 | } | |
242 | ||
f2f9800d YX |
243 | static void tipc_publ_unsubscribe(struct net *net, struct publication *publ, |
244 | u32 addr) | |
a8f48af5 YX |
245 | { |
246 | struct tipc_node *node; | |
247 | ||
f2f9800d | 248 | node = tipc_node_find(net, addr); |
a8f48af5 YX |
249 | if (!node) |
250 | return; | |
251 | ||
252 | tipc_node_lock(node); | |
253 | list_del_init(&publ->nodesub_list); | |
254 | tipc_node_unlock(node); | |
255 | } | |
256 | ||
b97bf3fd | 257 | /** |
a8f48af5 | 258 | * tipc_publ_purge - remove publication associated with a failed node |
c4307285 YH |
259 | * |
260 | * Invoked for each publication issued by a newly failed node. | |
b97bf3fd | 261 | * Removes publication structure from name table & deletes it. |
b97bf3fd | 262 | */ |
f2f9800d | 263 | static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr) |
b97bf3fd PL |
264 | { |
265 | struct publication *p; | |
f131072c | 266 | |
97ede29e | 267 | spin_lock_bh(&tipc_nametbl_lock); |
c4307285 | 268 | p = tipc_nametbl_remove_publ(publ->type, publ->lower, |
4323add6 | 269 | publ->node, publ->ref, publ->key); |
431697eb | 270 | if (p) |
f2f9800d | 271 | tipc_publ_unsubscribe(net, p, addr); |
97ede29e | 272 | spin_unlock_bh(&tipc_nametbl_lock); |
f131072c | 273 | |
c4307285 | 274 | if (p != publ) { |
2cf8aa19 EH |
275 | pr_err("Unable to remove publication from failed node\n" |
276 | " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", | |
277 | publ->type, publ->lower, publ->node, publ->ref, | |
278 | publ->key); | |
f131072c AS |
279 | } |
280 | ||
97ede29e | 281 | kfree_rcu(p, rcu); |
b97bf3fd PL |
282 | } |
283 | ||
f2f9800d | 284 | void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr) |
a8f48af5 YX |
285 | { |
286 | struct publication *publ, *tmp; | |
287 | ||
288 | list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list) | |
f2f9800d | 289 | tipc_publ_purge(net, publ, addr); |
a8f48af5 YX |
290 | } |
291 | ||
f4ad8a4b EH |
292 | /** |
293 | * tipc_update_nametbl - try to process a nametable update and notify | |
294 | * subscribers | |
295 | * | |
296 | * tipc_nametbl_lock must be held. | |
297 | * Returns the publication item if successful, otherwise NULL. | |
298 | */ | |
f2f9800d YX |
299 | static bool tipc_update_nametbl(struct net *net, struct distr_item *i, |
300 | u32 node, u32 dtype) | |
f4ad8a4b EH |
301 | { |
302 | struct publication *publ = NULL; | |
303 | ||
304 | if (dtype == PUBLICATION) { | |
305 | publ = tipc_nametbl_insert_publ(ntohl(i->type), ntohl(i->lower), | |
306 | ntohl(i->upper), | |
307 | TIPC_CLUSTER_SCOPE, node, | |
308 | ntohl(i->ref), ntohl(i->key)); | |
309 | if (publ) { | |
f2f9800d | 310 | tipc_publ_subscribe(net, publ, node); |
0fc4dffa | 311 | return true; |
f4ad8a4b EH |
312 | } |
313 | } else if (dtype == WITHDRAWAL) { | |
314 | publ = tipc_nametbl_remove_publ(ntohl(i->type), ntohl(i->lower), | |
315 | node, ntohl(i->ref), | |
316 | ntohl(i->key)); | |
317 | if (publ) { | |
f2f9800d | 318 | tipc_publ_unsubscribe(net, publ, node); |
97ede29e | 319 | kfree_rcu(publ, rcu); |
0fc4dffa | 320 | return true; |
f4ad8a4b EH |
321 | } |
322 | } else { | |
323 | pr_warn("Unrecognized name table message received\n"); | |
324 | } | |
0fc4dffa | 325 | return false; |
f4ad8a4b EH |
326 | } |
327 | ||
a5325ae5 EH |
328 | /** |
329 | * tipc_named_add_backlog - add a failed name table update to the backlog | |
330 | * | |
331 | */ | |
332 | static void tipc_named_add_backlog(struct distr_item *i, u32 type, u32 node) | |
333 | { | |
334 | struct distr_queue_item *e; | |
335 | unsigned long now = get_jiffies_64(); | |
336 | ||
337 | e = kzalloc(sizeof(*e), GFP_ATOMIC); | |
338 | if (!e) | |
339 | return; | |
340 | e->dtype = type; | |
341 | e->node = node; | |
342 | e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout); | |
343 | memcpy(e, i, sizeof(*i)); | |
344 | list_add_tail(&e->next, &tipc_dist_queue); | |
345 | } | |
346 | ||
347 | /** | |
348 | * tipc_named_process_backlog - try to process any pending name table updates | |
349 | * from the network. | |
350 | */ | |
f2f9800d | 351 | void tipc_named_process_backlog(struct net *net) |
a5325ae5 EH |
352 | { |
353 | struct distr_queue_item *e, *tmp; | |
354 | char addr[16]; | |
355 | unsigned long now = get_jiffies_64(); | |
356 | ||
357 | list_for_each_entry_safe(e, tmp, &tipc_dist_queue, next) { | |
358 | if (time_after(e->expires, now)) { | |
f2f9800d | 359 | if (!tipc_update_nametbl(net, &e->i, e->node, e->dtype)) |
a5325ae5 EH |
360 | continue; |
361 | } else { | |
362 | tipc_addr_string_fill(addr, e->node); | |
363 | pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n", | |
364 | e->dtype, ntohl(e->i.type), | |
365 | ntohl(e->i.lower), | |
366 | ntohl(e->i.upper), | |
367 | addr, ntohl(e->i.key)); | |
368 | } | |
369 | list_del(&e->next); | |
370 | kfree(e); | |
371 | } | |
372 | } | |
373 | ||
b97bf3fd | 374 | /** |
247f0f3c | 375 | * tipc_named_rcv - process name table update message sent by another node |
b97bf3fd | 376 | */ |
f2f9800d | 377 | void tipc_named_rcv(struct net *net, struct sk_buff *buf) |
b97bf3fd | 378 | { |
b97bf3fd PL |
379 | struct tipc_msg *msg = buf_msg(buf); |
380 | struct distr_item *item = (struct distr_item *)msg_data(msg); | |
381 | u32 count = msg_data_sz(msg) / ITEM_SIZE; | |
a5325ae5 | 382 | u32 node = msg_orignode(msg); |
b97bf3fd | 383 | |
97ede29e | 384 | spin_lock_bh(&tipc_nametbl_lock); |
b97bf3fd | 385 | while (count--) { |
f2f9800d | 386 | if (!tipc_update_nametbl(net, item, node, msg_type(msg))) |
a5325ae5 | 387 | tipc_named_add_backlog(item, msg_type(msg), node); |
b97bf3fd PL |
388 | item++; |
389 | } | |
f2f9800d | 390 | tipc_named_process_backlog(net); |
97ede29e | 391 | spin_unlock_bh(&tipc_nametbl_lock); |
5f6d9123 | 392 | kfree_skb(buf); |
b97bf3fd PL |
393 | } |
394 | ||
395 | /** | |
1110b8d3 | 396 | * tipc_named_reinit - re-initialize local publications |
c4307285 | 397 | * |
945af1c3 | 398 | * This routine is called whenever TIPC networking is enabled. |
1110b8d3 AS |
399 | * All name table entries published by this node are updated to reflect |
400 | * the node's new network address. | |
b97bf3fd | 401 | */ |
4323add6 | 402 | void tipc_named_reinit(void) |
b97bf3fd PL |
403 | { |
404 | struct publication *publ; | |
a909804f | 405 | int scope; |
b97bf3fd | 406 | |
97ede29e | 407 | spin_lock_bh(&tipc_nametbl_lock); |
945af1c3 | 408 | |
1110b8d3 | 409 | for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++) |
97ede29e YX |
410 | list_for_each_entry_rcu(publ, &tipc_nametbl->publ_list[scope], |
411 | local_list) | |
a909804f | 412 | publ->node = tipc_own_addr; |
945af1c3 | 413 | |
97ede29e | 414 | spin_unlock_bh(&tipc_nametbl_lock); |
b97bf3fd | 415 | } |