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 | ||
a5325ae5 EH |
43 | struct distr_queue_item { |
44 | struct distr_item i; | |
45 | u32 dtype; | |
46 | u32 node; | |
47 | unsigned long expires; | |
48 | struct list_head next; | |
49 | }; | |
50 | ||
b97bf3fd PL |
51 | /** |
52 | * publ_to_item - add publication info to a publication message | |
cb67296e RD |
53 | * @p: publication info |
54 | * @i: location of item in the message | |
b97bf3fd | 55 | */ |
b97bf3fd PL |
56 | static void publ_to_item(struct distr_item *i, struct publication *p) |
57 | { | |
58 | i->type = htonl(p->type); | |
59 | i->lower = htonl(p->lower); | |
60 | i->upper = htonl(p->upper); | |
e50e73e1 | 61 | i->port = htonl(p->port); |
b97bf3fd | 62 | i->key = htonl(p->key); |
b97bf3fd PL |
63 | } |
64 | ||
65 | /** | |
66 | * named_prepare_buf - allocate & initialize a publication message | |
cb67296e RD |
67 | * @net: the associated network namespace |
68 | * @type: message type | |
69 | * @size: payload size | |
70 | * @dest: destination node | |
d2f394dc PB |
71 | * |
72 | * The buffer returned is of size INT_H_SIZE + payload size | |
b97bf3fd | 73 | */ |
34747539 YX |
74 | static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size, |
75 | u32 dest) | |
b97bf3fd | 76 | { |
57d5f64d | 77 | struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC); |
23fd3eac | 78 | u32 self = tipc_own_addr(net); |
b97bf3fd PL |
79 | struct tipc_msg *msg; |
80 | ||
81 | if (buf != NULL) { | |
82 | msg = buf_msg(buf); | |
23fd3eac JM |
83 | tipc_msg_init(self, msg, NAME_DISTRIBUTOR, |
84 | type, INT_H_SIZE, dest); | |
741d9eb7 | 85 | msg_set_size(msg, INT_H_SIZE + size); |
b97bf3fd PL |
86 | } |
87 | return buf; | |
88 | } | |
89 | ||
90 | /** | |
4323add6 | 91 | * tipc_named_publish - tell other nodes about a new publication by this node |
cb67296e RD |
92 | * @net: the associated network namespace |
93 | * @publ: the new publication | |
b97bf3fd | 94 | */ |
4ac1c8d0 | 95 | struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ) |
b97bf3fd | 96 | { |
64a52b26 | 97 | struct name_table *nt = tipc_name_table(net); |
b97bf3fd | 98 | struct distr_item *item; |
64a52b26 | 99 | struct sk_buff *skb; |
b97bf3fd | 100 | |
64a52b26 | 101 | if (publ->scope == TIPC_NODE_SCOPE) { |
935439cc | 102 | list_add_tail_rcu(&publ->binding_node, &nt->node_scope); |
eab8c045 | 103 | return NULL; |
64a52b26 | 104 | } |
988f3f16 JM |
105 | write_lock_bh(&nt->cluster_scope_lock); |
106 | list_add_tail(&publ->binding_node, &nt->cluster_scope); | |
107 | write_unlock_bh(&nt->cluster_scope_lock); | |
64a52b26 JM |
108 | skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0); |
109 | if (!skb) { | |
2cf8aa19 | 110 | pr_warn("Publication distribution failure\n"); |
eab8c045 | 111 | return NULL; |
b97bf3fd | 112 | } |
cad2929d HHL |
113 | msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++); |
114 | msg_set_non_legacy(buf_msg(skb)); | |
64a52b26 | 115 | item = (struct distr_item *)msg_data(buf_msg(skb)); |
b97bf3fd | 116 | publ_to_item(item, publ); |
64a52b26 | 117 | return skb; |
b97bf3fd PL |
118 | } |
119 | ||
120 | /** | |
4323add6 | 121 | * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
cb67296e RD |
122 | * @net: the associated network namespace |
123 | * @publ: the withdrawn publication | |
b97bf3fd | 124 | */ |
34747539 | 125 | struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) |
b97bf3fd | 126 | { |
988f3f16 | 127 | struct name_table *nt = tipc_name_table(net); |
b97bf3fd | 128 | struct distr_item *item; |
cad2929d | 129 | struct sk_buff *skb; |
b97bf3fd | 130 | |
988f3f16 JM |
131 | write_lock_bh(&nt->cluster_scope_lock); |
132 | list_del(&publ->binding_node); | |
133 | write_unlock_bh(&nt->cluster_scope_lock); | |
1110b8d3 | 134 | if (publ->scope == TIPC_NODE_SCOPE) |
eab8c045 | 135 | return NULL; |
1110b8d3 | 136 | |
cad2929d HHL |
137 | skb = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0); |
138 | if (!skb) { | |
2cf8aa19 | 139 | pr_warn("Withdrawal distribution failure\n"); |
eab8c045 | 140 | return NULL; |
b97bf3fd | 141 | } |
cad2929d HHL |
142 | msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++); |
143 | msg_set_non_legacy(buf_msg(skb)); | |
144 | item = (struct distr_item *)msg_data(buf_msg(skb)); | |
b97bf3fd | 145 | publ_to_item(item, publ); |
cad2929d | 146 | return skb; |
b97bf3fd PL |
147 | } |
148 | ||
dbdf6d24 | 149 | /** |
e11aa059 | 150 | * named_distribute - prepare name info for bulk distribution to another node |
cb67296e | 151 | * @net: the associated network namespace |
a6ca1094 | 152 | * @list: list of messages (buffers) to be returned from this function |
dbdf6d24 JPM |
153 | * @dnode: node to be updated |
154 | * @pls: linked list of publication items to be packed into buffer chain | |
cb67296e | 155 | * @seqno: sequence number for this message |
e11aa059 | 156 | */ |
f2f9800d | 157 | static void named_distribute(struct net *net, struct sk_buff_head *list, |
cad2929d | 158 | u32 dnode, struct list_head *pls, u16 seqno) |
e11aa059 AS |
159 | { |
160 | struct publication *publ; | |
a6ca1094 | 161 | struct sk_buff *skb = NULL; |
e11aa059 | 162 | struct distr_item *item = NULL; |
f73b1281 | 163 | u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0, false) - INT_H_SIZE) / |
d2f394dc PB |
164 | ITEM_SIZE) * ITEM_SIZE; |
165 | u32 msg_rem = msg_dsz; | |
cad2929d | 166 | struct tipc_msg *hdr; |
e11aa059 | 167 | |
988f3f16 | 168 | list_for_each_entry(publ, pls, binding_node) { |
dbdf6d24 | 169 | /* Prepare next buffer: */ |
a6ca1094 | 170 | if (!skb) { |
34747539 YX |
171 | skb = named_prepare_buf(net, PUBLICATION, msg_rem, |
172 | dnode); | |
a6ca1094 | 173 | if (!skb) { |
2cf8aa19 | 174 | pr_warn("Bulk publication failure\n"); |
e11aa059 AS |
175 | return; |
176 | } | |
cad2929d HHL |
177 | hdr = buf_msg(skb); |
178 | msg_set_bc_ack_invalid(hdr, true); | |
179 | msg_set_bulk(hdr); | |
180 | msg_set_non_legacy(hdr); | |
181 | item = (struct distr_item *)msg_data(hdr); | |
e11aa059 | 182 | } |
dbdf6d24 JPM |
183 | |
184 | /* Pack publication into message: */ | |
e11aa059 AS |
185 | publ_to_item(item, publ); |
186 | item++; | |
dbdf6d24 JPM |
187 | msg_rem -= ITEM_SIZE; |
188 | ||
189 | /* Append full buffer to list: */ | |
190 | if (!msg_rem) { | |
a6ca1094 YX |
191 | __skb_queue_tail(list, skb); |
192 | skb = NULL; | |
1b61e70a | 193 | msg_rem = msg_dsz; |
e11aa059 AS |
194 | } |
195 | } | |
1b61e70a | 196 | if (skb) { |
cad2929d HHL |
197 | hdr = buf_msg(skb); |
198 | msg_set_size(hdr, INT_H_SIZE + (msg_dsz - msg_rem)); | |
1b61e70a YX |
199 | skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); |
200 | __skb_queue_tail(list, skb); | |
201 | } | |
cad2929d HHL |
202 | hdr = buf_msg(skb_peek_tail(list)); |
203 | msg_set_last_bulk(hdr); | |
204 | msg_set_named_seqno(hdr, seqno); | |
e11aa059 AS |
205 | } |
206 | ||
b97bf3fd | 207 | /** |
4323add6 | 208 | * tipc_named_node_up - tell specified node about all publications by this node |
cb67296e RD |
209 | * @net: the associated network namespace |
210 | * @dnode: destination node | |
211 | * @capabilities: peer node's capabilities | |
b97bf3fd | 212 | */ |
cad2929d | 213 | void tipc_named_node_up(struct net *net, u32 dnode, u16 capabilities) |
b97bf3fd | 214 | { |
64a52b26 | 215 | struct name_table *nt = tipc_name_table(net); |
cad2929d | 216 | struct tipc_net *tn = tipc_net(net); |
a6ca1094 | 217 | struct sk_buff_head head; |
cad2929d | 218 | u16 seqno; |
a6ca1094 | 219 | |
e654f9f5 | 220 | __skb_queue_head_init(&head); |
cad2929d HHL |
221 | spin_lock_bh(&tn->nametbl_lock); |
222 | if (!(capabilities & TIPC_NAMED_BCAST)) | |
223 | nt->rc_dests++; | |
224 | seqno = nt->snd_nxt; | |
225 | spin_unlock_bh(&tn->nametbl_lock); | |
9aa88c2a | 226 | |
988f3f16 | 227 | read_lock_bh(&nt->cluster_scope_lock); |
cad2929d | 228 | named_distribute(net, &head, dnode, &nt->cluster_scope, seqno); |
c49a0a84 | 229 | tipc_node_xmit(net, &head, dnode, 0); |
988f3f16 | 230 | read_unlock_bh(&nt->cluster_scope_lock); |
b97bf3fd PL |
231 | } |
232 | ||
233 | /** | |
a8f48af5 | 234 | * tipc_publ_purge - remove publication associated with a failed node |
cb67296e RD |
235 | * @net: the associated network namespace |
236 | * @publ: the publication to remove | |
237 | * @addr: failed node's address | |
c4307285 YH |
238 | * |
239 | * Invoked for each publication issued by a newly failed node. | |
b97bf3fd | 240 | * Removes publication structure from name table & deletes it. |
b97bf3fd | 241 | */ |
f2f9800d | 242 | static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr) |
b97bf3fd | 243 | { |
37922ea4 | 244 | struct tipc_net *tn = tipc_net(net); |
b97bf3fd | 245 | struct publication *p; |
f131072c | 246 | |
4ac1c8d0 | 247 | spin_lock_bh(&tn->nametbl_lock); |
37922ea4 JM |
248 | p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper, |
249 | publ->node, publ->key); | |
431697eb | 250 | if (p) |
935439cc | 251 | tipc_node_unsubscribe(net, &p->binding_node, addr); |
4ac1c8d0 | 252 | spin_unlock_bh(&tn->nametbl_lock); |
f131072c | 253 | |
c4307285 | 254 | if (p != publ) { |
2cf8aa19 | 255 | pr_err("Unable to remove publication from failed node\n" |
e50e73e1 JM |
256 | " (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n", |
257 | publ->type, publ->lower, publ->node, publ->port, | |
2cf8aa19 | 258 | publ->key); |
f131072c AS |
259 | } |
260 | ||
42dec1db XL |
261 | if (p) |
262 | kfree_rcu(p, rcu); | |
b97bf3fd PL |
263 | } |
264 | ||
cad2929d HHL |
265 | void tipc_publ_notify(struct net *net, struct list_head *nsub_list, |
266 | u32 addr, u16 capabilities) | |
a8f48af5 | 267 | { |
cad2929d HHL |
268 | struct name_table *nt = tipc_name_table(net); |
269 | struct tipc_net *tn = tipc_net(net); | |
270 | ||
a8f48af5 YX |
271 | struct publication *publ, *tmp; |
272 | ||
935439cc | 273 | list_for_each_entry_safe(publ, tmp, nsub_list, binding_node) |
f2f9800d | 274 | tipc_publ_purge(net, publ, addr); |
cad2929d HHL |
275 | spin_lock_bh(&tn->nametbl_lock); |
276 | if (!(capabilities & TIPC_NAMED_BCAST)) | |
277 | nt->rc_dests--; | |
278 | spin_unlock_bh(&tn->nametbl_lock); | |
a8f48af5 YX |
279 | } |
280 | ||
f4ad8a4b EH |
281 | /** |
282 | * tipc_update_nametbl - try to process a nametable update and notify | |
283 | * subscribers | |
cb67296e RD |
284 | * @net: the associated network namespace |
285 | * @i: location of item in the message | |
286 | * @node: node address | |
287 | * @dtype: name distributor message type | |
f4ad8a4b EH |
288 | * |
289 | * tipc_nametbl_lock must be held. | |
637b77fd | 290 | * Return: the publication item if successful, otherwise NULL. |
f4ad8a4b | 291 | */ |
f2f9800d YX |
292 | static bool tipc_update_nametbl(struct net *net, struct distr_item *i, |
293 | u32 node, u32 dtype) | |
f4ad8a4b | 294 | { |
37922ea4 JM |
295 | struct publication *p = NULL; |
296 | u32 lower = ntohl(i->lower); | |
297 | u32 upper = ntohl(i->upper); | |
298 | u32 type = ntohl(i->type); | |
299 | u32 port = ntohl(i->port); | |
300 | u32 key = ntohl(i->key); | |
f4ad8a4b EH |
301 | |
302 | if (dtype == PUBLICATION) { | |
37922ea4 JM |
303 | p = tipc_nametbl_insert_publ(net, type, lower, upper, |
304 | TIPC_CLUSTER_SCOPE, node, | |
305 | port, key); | |
306 | if (p) { | |
307 | tipc_node_subscribe(net, &p->binding_node, node); | |
0fc4dffa | 308 | return true; |
f4ad8a4b EH |
309 | } |
310 | } else if (dtype == WITHDRAWAL) { | |
37922ea4 JM |
311 | p = tipc_nametbl_remove_publ(net, type, lower, |
312 | upper, node, key); | |
313 | if (p) { | |
314 | tipc_node_unsubscribe(net, &p->binding_node, node); | |
315 | kfree_rcu(p, rcu); | |
0fc4dffa | 316 | return true; |
f4ad8a4b | 317 | } |
37922ea4 JM |
318 | pr_warn_ratelimited("Failed to remove binding %u,%u from %x\n", |
319 | type, lower, node); | |
f4ad8a4b EH |
320 | } else { |
321 | pr_warn("Unrecognized name table message received\n"); | |
322 | } | |
0fc4dffa | 323 | return false; |
f4ad8a4b EH |
324 | } |
325 | ||
cad2929d HHL |
326 | static struct sk_buff *tipc_named_dequeue(struct sk_buff_head *namedq, |
327 | u16 *rcv_nxt, bool *open) | |
328 | { | |
329 | struct sk_buff *skb, *tmp; | |
330 | struct tipc_msg *hdr; | |
331 | u16 seqno; | |
332 | ||
7b50ee3d | 333 | spin_lock_bh(&namedq->lock); |
cad2929d | 334 | skb_queue_walk_safe(namedq, skb, tmp) { |
7b50ee3d HHL |
335 | if (unlikely(skb_linearize(skb))) { |
336 | __skb_unlink(skb, namedq); | |
337 | kfree_skb(skb); | |
338 | continue; | |
339 | } | |
cad2929d HHL |
340 | hdr = buf_msg(skb); |
341 | seqno = msg_named_seqno(hdr); | |
342 | if (msg_is_last_bulk(hdr)) { | |
343 | *rcv_nxt = seqno; | |
344 | *open = true; | |
345 | } | |
346 | ||
347 | if (msg_is_bulk(hdr) || msg_is_legacy(hdr)) { | |
348 | __skb_unlink(skb, namedq); | |
7b50ee3d | 349 | spin_unlock_bh(&namedq->lock); |
cad2929d HHL |
350 | return skb; |
351 | } | |
352 | ||
353 | if (*open && (*rcv_nxt == seqno)) { | |
354 | (*rcv_nxt)++; | |
355 | __skb_unlink(skb, namedq); | |
7b50ee3d | 356 | spin_unlock_bh(&namedq->lock); |
cad2929d HHL |
357 | return skb; |
358 | } | |
359 | ||
360 | if (less(seqno, *rcv_nxt)) { | |
361 | __skb_unlink(skb, namedq); | |
362 | kfree_skb(skb); | |
363 | continue; | |
364 | } | |
365 | } | |
7b50ee3d | 366 | spin_unlock_bh(&namedq->lock); |
cad2929d HHL |
367 | return NULL; |
368 | } | |
369 | ||
b97bf3fd | 370 | /** |
c637c103 | 371 | * tipc_named_rcv - process name table update messages sent by another node |
cb67296e RD |
372 | * @net: the associated network namespace |
373 | * @namedq: queue to receive from | |
374 | * @rcv_nxt: store last received seqno here | |
375 | * @open: last bulk msg was received (FIXME) | |
b97bf3fd | 376 | */ |
cad2929d HHL |
377 | void tipc_named_rcv(struct net *net, struct sk_buff_head *namedq, |
378 | u16 *rcv_nxt, bool *open) | |
b97bf3fd | 379 | { |
cad2929d | 380 | struct tipc_net *tn = tipc_net(net); |
c637c103 | 381 | struct distr_item *item; |
cad2929d | 382 | struct tipc_msg *hdr; |
c637c103 | 383 | struct sk_buff *skb; |
cad2929d | 384 | u32 count, node; |
b97bf3fd | 385 | |
4ac1c8d0 | 386 | spin_lock_bh(&tn->nametbl_lock); |
cad2929d HHL |
387 | while ((skb = tipc_named_dequeue(namedq, rcv_nxt, open))) { |
388 | hdr = buf_msg(skb); | |
389 | node = msg_orignode(hdr); | |
390 | item = (struct distr_item *)msg_data(hdr); | |
391 | count = msg_data_sz(hdr) / ITEM_SIZE; | |
c637c103 | 392 | while (count--) { |
cad2929d | 393 | tipc_update_nametbl(net, item, node, msg_type(hdr)); |
c637c103 JPM |
394 | item++; |
395 | } | |
396 | kfree_skb(skb); | |
b97bf3fd | 397 | } |
4ac1c8d0 | 398 | spin_unlock_bh(&tn->nametbl_lock); |
b97bf3fd PL |
399 | } |
400 | ||
401 | /** | |
1110b8d3 | 402 | * tipc_named_reinit - re-initialize local publications |
cb67296e | 403 | * @net: the associated network namespace |
c4307285 | 404 | * |
945af1c3 | 405 | * This routine is called whenever TIPC networking is enabled. |
1110b8d3 AS |
406 | * All name table entries published by this node are updated to reflect |
407 | * the node's new network address. | |
b97bf3fd | 408 | */ |
4ac1c8d0 | 409 | void tipc_named_reinit(struct net *net) |
b97bf3fd | 410 | { |
64a52b26 JM |
411 | struct name_table *nt = tipc_name_table(net); |
412 | struct tipc_net *tn = tipc_net(net); | |
b97bf3fd | 413 | struct publication *publ; |
23fd3eac | 414 | u32 self = tipc_own_addr(net); |
b97bf3fd | 415 | |
4ac1c8d0 | 416 | spin_lock_bh(&tn->nametbl_lock); |
945af1c3 | 417 | |
935439cc | 418 | list_for_each_entry_rcu(publ, &nt->node_scope, binding_node) |
23fd3eac | 419 | publ->node = self; |
935439cc | 420 | list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node) |
23fd3eac | 421 | publ->node = self; |
cad2929d | 422 | nt->rc_dests = 0; |
4ac1c8d0 | 423 | spin_unlock_bh(&tn->nametbl_lock); |
b97bf3fd | 424 | } |