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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 | ||
87 | /** | |
4323add6 | 88 | * tipc_named_publish - tell other nodes about a new publication by this node |
b97bf3fd | 89 | */ |
4ac1c8d0 | 90 | struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ) |
b97bf3fd | 91 | { |
4ac1c8d0 | 92 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd PL |
93 | struct sk_buff *buf; |
94 | struct distr_item *item; | |
95 | ||
97ede29e | 96 | list_add_tail_rcu(&publ->local_list, |
4ac1c8d0 | 97 | &tn->nametbl->publ_list[publ->scope]); |
b97bf3fd | 98 | |
1110b8d3 | 99 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 100 | return NULL; |
1110b8d3 | 101 | |
34747539 | 102 | buf = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0); |
b97bf3fd | 103 | if (!buf) { |
2cf8aa19 | 104 | pr_warn("Publication distribution failure\n"); |
eab8c045 | 105 | return NULL; |
b97bf3fd PL |
106 | } |
107 | ||
108 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
109 | publ_to_item(item, publ); | |
eab8c045 | 110 | return buf; |
b97bf3fd PL |
111 | } |
112 | ||
113 | /** | |
4323add6 | 114 | * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
b97bf3fd | 115 | */ |
34747539 | 116 | struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) |
b97bf3fd PL |
117 | { |
118 | struct sk_buff *buf; | |
119 | struct distr_item *item; | |
120 | ||
121 | list_del(&publ->local_list); | |
b97bf3fd | 122 | |
1110b8d3 | 123 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 124 | return NULL; |
1110b8d3 | 125 | |
34747539 | 126 | buf = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0); |
b97bf3fd | 127 | if (!buf) { |
2cf8aa19 | 128 | pr_warn("Withdrawal distribution failure\n"); |
eab8c045 | 129 | return NULL; |
b97bf3fd PL |
130 | } |
131 | ||
132 | item = (struct distr_item *)msg_data(buf_msg(buf)); | |
133 | publ_to_item(item, publ); | |
eab8c045 | 134 | return buf; |
b97bf3fd PL |
135 | } |
136 | ||
dbdf6d24 | 137 | /** |
e11aa059 | 138 | * named_distribute - prepare name info for bulk distribution to another node |
a6ca1094 | 139 | * @list: list of messages (buffers) to be returned from this function |
dbdf6d24 JPM |
140 | * @dnode: node to be updated |
141 | * @pls: linked list of publication items to be packed into buffer chain | |
e11aa059 | 142 | */ |
f2f9800d YX |
143 | static void named_distribute(struct net *net, struct sk_buff_head *list, |
144 | u32 dnode, struct list_head *pls) | |
e11aa059 AS |
145 | { |
146 | struct publication *publ; | |
a6ca1094 | 147 | struct sk_buff *skb = NULL; |
e11aa059 | 148 | struct distr_item *item = NULL; |
f2f9800d YX |
149 | uint msg_dsz = (tipc_node_get_mtu(net, dnode, 0) / ITEM_SIZE) * |
150 | ITEM_SIZE; | |
1b61e70a | 151 | uint msg_rem = msg_dsz; |
e11aa059 | 152 | |
993bfe5d | 153 | list_for_each_entry(publ, pls, local_list) { |
dbdf6d24 | 154 | /* Prepare next buffer: */ |
a6ca1094 | 155 | if (!skb) { |
34747539 YX |
156 | skb = named_prepare_buf(net, PUBLICATION, msg_rem, |
157 | dnode); | |
a6ca1094 | 158 | if (!skb) { |
2cf8aa19 | 159 | pr_warn("Bulk publication failure\n"); |
e11aa059 AS |
160 | return; |
161 | } | |
a6ca1094 | 162 | item = (struct distr_item *)msg_data(buf_msg(skb)); |
e11aa059 | 163 | } |
dbdf6d24 JPM |
164 | |
165 | /* Pack publication into message: */ | |
e11aa059 AS |
166 | publ_to_item(item, publ); |
167 | item++; | |
dbdf6d24 JPM |
168 | msg_rem -= ITEM_SIZE; |
169 | ||
170 | /* Append full buffer to list: */ | |
171 | if (!msg_rem) { | |
a6ca1094 YX |
172 | __skb_queue_tail(list, skb); |
173 | skb = NULL; | |
1b61e70a | 174 | msg_rem = msg_dsz; |
e11aa059 AS |
175 | } |
176 | } | |
1b61e70a YX |
177 | if (skb) { |
178 | msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem)); | |
179 | skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); | |
180 | __skb_queue_tail(list, skb); | |
181 | } | |
e11aa059 AS |
182 | } |
183 | ||
b97bf3fd | 184 | /** |
4323add6 | 185 | * tipc_named_node_up - tell specified node about all publications by this node |
b97bf3fd | 186 | */ |
f2f9800d | 187 | void tipc_named_node_up(struct net *net, u32 dnode) |
b97bf3fd | 188 | { |
4ac1c8d0 | 189 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a6ca1094 YX |
190 | struct sk_buff_head head; |
191 | ||
192 | __skb_queue_head_init(&head); | |
9aa88c2a | 193 | |
97ede29e | 194 | rcu_read_lock(); |
f2f9800d | 195 | named_distribute(net, &head, dnode, |
4ac1c8d0 | 196 | &tn->nametbl->publ_list[TIPC_CLUSTER_SCOPE]); |
f2f9800d | 197 | named_distribute(net, &head, dnode, |
4ac1c8d0 | 198 | &tn->nametbl->publ_list[TIPC_ZONE_SCOPE]); |
97ede29e | 199 | rcu_read_unlock(); |
9aa88c2a | 200 | |
c49a0a84 | 201 | tipc_node_xmit(net, &head, dnode, 0); |
b97bf3fd PL |
202 | } |
203 | ||
204 | /** | |
a8f48af5 | 205 | * tipc_publ_purge - remove publication associated with a failed node |
c4307285 YH |
206 | * |
207 | * Invoked for each publication issued by a newly failed node. | |
b97bf3fd | 208 | * Removes publication structure from name table & deletes it. |
b97bf3fd | 209 | */ |
f2f9800d | 210 | static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr) |
b97bf3fd | 211 | { |
4ac1c8d0 | 212 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd | 213 | struct publication *p; |
f131072c | 214 | |
4ac1c8d0 YX |
215 | spin_lock_bh(&tn->nametbl_lock); |
216 | p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, | |
4323add6 | 217 | publ->node, publ->ref, publ->key); |
431697eb | 218 | if (p) |
1d7e1c25 | 219 | tipc_node_unsubscribe(net, &p->nodesub_list, addr); |
4ac1c8d0 | 220 | spin_unlock_bh(&tn->nametbl_lock); |
f131072c | 221 | |
c4307285 | 222 | if (p != publ) { |
2cf8aa19 EH |
223 | pr_err("Unable to remove publication from failed node\n" |
224 | " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n", | |
225 | publ->type, publ->lower, publ->node, publ->ref, | |
226 | publ->key); | |
f131072c AS |
227 | } |
228 | ||
97ede29e | 229 | kfree_rcu(p, rcu); |
b97bf3fd PL |
230 | } |
231 | ||
f2f9800d | 232 | void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr) |
a8f48af5 YX |
233 | { |
234 | struct publication *publ, *tmp; | |
235 | ||
236 | list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list) | |
f2f9800d | 237 | tipc_publ_purge(net, publ, addr); |
a8f48af5 YX |
238 | } |
239 | ||
f4ad8a4b EH |
240 | /** |
241 | * tipc_update_nametbl - try to process a nametable update and notify | |
242 | * subscribers | |
243 | * | |
244 | * tipc_nametbl_lock must be held. | |
245 | * Returns the publication item if successful, otherwise NULL. | |
246 | */ | |
f2f9800d YX |
247 | static bool tipc_update_nametbl(struct net *net, struct distr_item *i, |
248 | u32 node, u32 dtype) | |
f4ad8a4b EH |
249 | { |
250 | struct publication *publ = NULL; | |
251 | ||
252 | if (dtype == PUBLICATION) { | |
4ac1c8d0 YX |
253 | publ = tipc_nametbl_insert_publ(net, ntohl(i->type), |
254 | ntohl(i->lower), | |
f4ad8a4b EH |
255 | ntohl(i->upper), |
256 | TIPC_CLUSTER_SCOPE, node, | |
257 | ntohl(i->ref), ntohl(i->key)); | |
258 | if (publ) { | |
1d7e1c25 | 259 | tipc_node_subscribe(net, &publ->nodesub_list, node); |
0fc4dffa | 260 | return true; |
f4ad8a4b EH |
261 | } |
262 | } else if (dtype == WITHDRAWAL) { | |
4ac1c8d0 YX |
263 | publ = tipc_nametbl_remove_publ(net, ntohl(i->type), |
264 | ntohl(i->lower), | |
f4ad8a4b EH |
265 | node, ntohl(i->ref), |
266 | ntohl(i->key)); | |
267 | if (publ) { | |
1d7e1c25 | 268 | tipc_node_unsubscribe(net, &publ->nodesub_list, node); |
97ede29e | 269 | kfree_rcu(publ, rcu); |
0fc4dffa | 270 | return true; |
f4ad8a4b EH |
271 | } |
272 | } else { | |
273 | pr_warn("Unrecognized name table message received\n"); | |
274 | } | |
0fc4dffa | 275 | return false; |
f4ad8a4b EH |
276 | } |
277 | ||
a5325ae5 EH |
278 | /** |
279 | * tipc_named_add_backlog - add a failed name table update to the backlog | |
280 | * | |
281 | */ | |
282 | static void tipc_named_add_backlog(struct distr_item *i, u32 type, u32 node) | |
283 | { | |
284 | struct distr_queue_item *e; | |
285 | unsigned long now = get_jiffies_64(); | |
286 | ||
287 | e = kzalloc(sizeof(*e), GFP_ATOMIC); | |
288 | if (!e) | |
289 | return; | |
290 | e->dtype = type; | |
291 | e->node = node; | |
292 | e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout); | |
293 | memcpy(e, i, sizeof(*i)); | |
294 | list_add_tail(&e->next, &tipc_dist_queue); | |
295 | } | |
296 | ||
297 | /** | |
298 | * tipc_named_process_backlog - try to process any pending name table updates | |
299 | * from the network. | |
300 | */ | |
f2f9800d | 301 | void tipc_named_process_backlog(struct net *net) |
a5325ae5 EH |
302 | { |
303 | struct distr_queue_item *e, *tmp; | |
304 | char addr[16]; | |
305 | unsigned long now = get_jiffies_64(); | |
306 | ||
307 | list_for_each_entry_safe(e, tmp, &tipc_dist_queue, next) { | |
308 | if (time_after(e->expires, now)) { | |
f2f9800d | 309 | if (!tipc_update_nametbl(net, &e->i, e->node, e->dtype)) |
a5325ae5 EH |
310 | continue; |
311 | } else { | |
312 | tipc_addr_string_fill(addr, e->node); | |
313 | pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n", | |
314 | e->dtype, ntohl(e->i.type), | |
315 | ntohl(e->i.lower), | |
316 | ntohl(e->i.upper), | |
317 | addr, ntohl(e->i.key)); | |
318 | } | |
319 | list_del(&e->next); | |
320 | kfree(e); | |
321 | } | |
322 | } | |
323 | ||
b97bf3fd | 324 | /** |
c637c103 | 325 | * tipc_named_rcv - process name table update messages sent by another node |
b97bf3fd | 326 | */ |
c637c103 | 327 | void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq) |
b97bf3fd | 328 | { |
4ac1c8d0 | 329 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
c637c103 JPM |
330 | struct tipc_msg *msg; |
331 | struct distr_item *item; | |
332 | uint count; | |
333 | u32 node; | |
334 | struct sk_buff *skb; | |
335 | int mtype; | |
b97bf3fd | 336 | |
4ac1c8d0 | 337 | spin_lock_bh(&tn->nametbl_lock); |
c637c103 | 338 | for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) { |
c7cad0d6 | 339 | skb_linearize(skb); |
c637c103 JPM |
340 | msg = buf_msg(skb); |
341 | mtype = msg_type(msg); | |
342 | item = (struct distr_item *)msg_data(msg); | |
343 | count = msg_data_sz(msg) / ITEM_SIZE; | |
344 | node = msg_orignode(msg); | |
345 | while (count--) { | |
346 | if (!tipc_update_nametbl(net, item, node, mtype)) | |
347 | tipc_named_add_backlog(item, mtype, node); | |
348 | item++; | |
349 | } | |
350 | kfree_skb(skb); | |
351 | tipc_named_process_backlog(net); | |
b97bf3fd | 352 | } |
4ac1c8d0 | 353 | spin_unlock_bh(&tn->nametbl_lock); |
b97bf3fd PL |
354 | } |
355 | ||
356 | /** | |
1110b8d3 | 357 | * tipc_named_reinit - re-initialize local publications |
c4307285 | 358 | * |
945af1c3 | 359 | * This routine is called whenever TIPC networking is enabled. |
1110b8d3 AS |
360 | * All name table entries published by this node are updated to reflect |
361 | * the node's new network address. | |
b97bf3fd | 362 | */ |
4ac1c8d0 | 363 | void tipc_named_reinit(struct net *net) |
b97bf3fd | 364 | { |
4ac1c8d0 | 365 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
b97bf3fd | 366 | struct publication *publ; |
a909804f | 367 | int scope; |
b97bf3fd | 368 | |
4ac1c8d0 | 369 | spin_lock_bh(&tn->nametbl_lock); |
945af1c3 | 370 | |
1110b8d3 | 371 | for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++) |
4ac1c8d0 | 372 | list_for_each_entry_rcu(publ, &tn->nametbl->publ_list[scope], |
97ede29e | 373 | local_list) |
34747539 | 374 | publ->node = tn->own_addr; |
945af1c3 | 375 | |
4ac1c8d0 | 376 | spin_unlock_bh(&tn->nametbl_lock); |
b97bf3fd | 377 | } |