blob: e0d08055754ea656ab1afdd5dee59a51f16bb163 [file] [log] [blame]
Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/name_distr.c: TIPC name distribution code
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 2000-2006, Ericsson AB
Allan Stephens431697e2011-02-23 13:51:15 -05005 * Copyright (c) 2005, 2010-2011, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "link.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "name_distr.h"
40
Per Lidenb97bf3f2006-01-02 19:04:38 +010041#define ITEM_SIZE sizeof(struct distr_item)
42
43/**
44 * struct distr_item - publication info distributed to other nodes
45 * @type: name sequence type
46 * @lower: name sequence lower bound
47 * @upper: name sequence upper bound
48 * @ref: publishing port reference
49 * @key: publication key
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090050 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010051 * ===> All fields are stored in network byte order. <===
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090052 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010053 * First 3 fields identify (name or) name sequence being published.
54 * Reference field uniquely identifies port that published name sequence.
55 * Key field uniquely identifies publication, in the event a port has
56 * multiple publications of the same name sequence.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090057 *
58 * Note: There is no field that identifies the publishing node because it is
Per Lidenb97bf3f2006-01-02 19:04:38 +010059 * the same for all items contained within a publication message.
60 */
Per Lidenb97bf3f2006-01-02 19:04:38 +010061struct distr_item {
Al Viro3e6c8cd2006-11-08 00:19:09 -080062 __be32 type;
63 __be32 lower;
64 __be32 upper;
65 __be32 ref;
66 __be32 key;
Per Lidenb97bf3f2006-01-02 19:04:38 +010067};
68
69/**
Allan Stephens3f8375f2012-04-17 17:57:52 -040070 * struct publ_list - list of publications made by this node
71 * @list: circular list of publications
72 * @list_size: number of entries in list
Per Lidenb97bf3f2006-01-02 19:04:38 +010073 */
Allan Stephens3f8375f2012-04-17 17:57:52 -040074struct publ_list {
75 struct list_head list;
76 u32 size;
77};
Per Lidenb97bf3f2006-01-02 19:04:38 +010078
Allan Stephensa9098042012-04-17 17:57:52 -040079static struct publ_list publ_zone = {
80 .list = LIST_HEAD_INIT(publ_zone.list),
81 .size = 0,
82};
83
Allan Stephens3f8375f2012-04-17 17:57:52 -040084static struct publ_list publ_cluster = {
85 .list = LIST_HEAD_INIT(publ_cluster.list),
86 .size = 0,
87};
Per Lidenb97bf3f2006-01-02 19:04:38 +010088
Allan Stephensa9098042012-04-17 17:57:52 -040089static struct publ_list publ_node = {
90 .list = LIST_HEAD_INIT(publ_node.list),
91 .size = 0,
92};
93
94static struct publ_list *publ_lists[] = {
95 NULL,
96 &publ_zone, /* publ_lists[TIPC_ZONE_SCOPE] */
97 &publ_cluster, /* publ_lists[TIPC_CLUSTER_SCOPE] */
98 &publ_node /* publ_lists[TIPC_NODE_SCOPE] */
99};
100
101
Per Lidenb97bf3f2006-01-02 19:04:38 +0100102/**
103 * publ_to_item - add publication info to a publication message
104 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100105static void publ_to_item(struct distr_item *i, struct publication *p)
106{
107 i->type = htonl(p->type);
108 i->lower = htonl(p->lower);
109 i->upper = htonl(p->upper);
110 i->ref = htonl(p->ref);
111 i->key = htonl(p->key);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100112}
113
114/**
115 * named_prepare_buf - allocate & initialize a publication message
116 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest)
118{
Allan Stephens741d9eb2011-05-31 15:03:18 -0400119 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 struct tipc_msg *msg;
121
122 if (buf != NULL) {
123 msg = buf_msg(buf);
Allan Stephens741d9eb2011-05-31 15:03:18 -0400124 tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest);
125 msg_set_size(msg, INT_H_SIZE + size);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100126 }
127 return buf;
128}
129
Allan Stephens8f92df62010-12-31 18:59:19 +0000130static void named_cluster_distribute(struct sk_buff *buf)
131{
132 struct sk_buff *buf_copy;
133 struct tipc_node *n_ptr;
Allan Stephens8f92df62010-12-31 18:59:19 +0000134
Allan Stephens672d99e2011-02-25 18:42:52 -0500135 list_for_each_entry(n_ptr, &tipc_node_list, list) {
Paul Gortmaker8f19afb2011-02-28 11:36:21 -0400136 if (tipc_node_active_links(n_ptr)) {
Allan Stephens8f92df62010-12-31 18:59:19 +0000137 buf_copy = skb_copy(buf, GFP_ATOMIC);
138 if (!buf_copy)
139 break;
140 msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
141 tipc_link_send(buf_copy, n_ptr->addr, n_ptr->addr);
142 }
143 }
144
Allan Stephens5f6d9122011-11-04 13:24:29 -0400145 kfree_skb(buf);
Allan Stephens8f92df62010-12-31 18:59:19 +0000146}
147
Per Lidenb97bf3f2006-01-02 19:04:38 +0100148/**
Per Liden4323add2006-01-18 00:38:21 +0100149 * tipc_named_publish - tell other nodes about a new publication by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100150 */
Per Liden4323add2006-01-18 00:38:21 +0100151void tipc_named_publish(struct publication *publ)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100152{
153 struct sk_buff *buf;
154 struct distr_item *item;
155
Allan Stephensa9098042012-04-17 17:57:52 -0400156 list_add_tail(&publ->local_list, &publ_lists[publ->scope]->list);
157 publ_lists[publ->scope]->size++;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100158
Allan Stephens1110b8d2012-04-17 17:57:52 -0400159 if (publ->scope == TIPC_NODE_SCOPE)
160 return;
161
Per Lidenb97bf3f2006-01-02 19:04:38 +0100162 buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0);
163 if (!buf) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400164 pr_warn("Publication distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100165 return;
166 }
167
168 item = (struct distr_item *)msg_data(buf_msg(buf));
169 publ_to_item(item, publ);
Allan Stephens8f92df62010-12-31 18:59:19 +0000170 named_cluster_distribute(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100171}
172
173/**
Per Liden4323add2006-01-18 00:38:21 +0100174 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100175 */
Per Liden4323add2006-01-18 00:38:21 +0100176void tipc_named_withdraw(struct publication *publ)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100177{
178 struct sk_buff *buf;
179 struct distr_item *item;
180
181 list_del(&publ->local_list);
Allan Stephensa9098042012-04-17 17:57:52 -0400182 publ_lists[publ->scope]->size--;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183
Allan Stephens1110b8d2012-04-17 17:57:52 -0400184 if (publ->scope == TIPC_NODE_SCOPE)
185 return;
186
Per Lidenb97bf3f2006-01-02 19:04:38 +0100187 buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0);
188 if (!buf) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400189 pr_warn("Withdrawal distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100190 return;
191 }
192
193 item = (struct distr_item *)msg_data(buf_msg(buf));
194 publ_to_item(item, publ);
Allan Stephens8f92df62010-12-31 18:59:19 +0000195 named_cluster_distribute(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100196}
197
Allan Stephense11aa052012-04-17 17:57:52 -0400198/*
199 * named_distribute - prepare name info for bulk distribution to another node
200 */
201static void named_distribute(struct list_head *message_list, u32 node,
202 struct publ_list *pls, u32 max_item_buf)
203{
204 struct publication *publ;
205 struct sk_buff *buf = NULL;
206 struct distr_item *item = NULL;
207 u32 left = 0;
208 u32 rest = pls->size * ITEM_SIZE;
209
210 list_for_each_entry(publ, &pls->list, local_list) {
211 if (!buf) {
212 left = (rest <= max_item_buf) ? rest : max_item_buf;
213 rest -= left;
214 buf = named_prepare_buf(PUBLICATION, left, node);
215 if (!buf) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400216 pr_warn("Bulk publication failure\n");
Allan Stephense11aa052012-04-17 17:57:52 -0400217 return;
218 }
219 item = (struct distr_item *)msg_data(buf_msg(buf));
220 }
221 publ_to_item(item, publ);
222 item++;
223 left -= ITEM_SIZE;
224 if (!left) {
225 list_add_tail((struct list_head *)buf, message_list);
226 buf = NULL;
227 }
228 }
229}
230
Per Lidenb97bf3f2006-01-02 19:04:38 +0100231/**
Per Liden4323add2006-01-18 00:38:21 +0100232 * tipc_named_node_up - tell specified node about all publications by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233 */
Paul Gortmaker1c553bb2011-09-02 13:45:34 -0400234void tipc_named_node_up(unsigned long nodearg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100235{
Allan Stephens149ce372011-05-31 11:05:02 -0400236 struct tipc_node *n_ptr;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500237 struct tipc_link *l_ptr;
Allan Stephens9aa88c22011-05-31 13:38:02 -0400238 struct list_head message_list;
Paul Gortmaker1c553bb2011-09-02 13:45:34 -0400239 u32 node = (u32)nodearg;
Allan Stephens149ce372011-05-31 11:05:02 -0400240 u32 max_item_buf = 0;
241
242 /* compute maximum amount of publication data to send per message */
Allan Stephens149ce372011-05-31 11:05:02 -0400243 read_lock_bh(&tipc_net_lock);
Paul Gortmaker1c553bb2011-09-02 13:45:34 -0400244 n_ptr = tipc_node_find(node);
Allan Stephens149ce372011-05-31 11:05:02 -0400245 if (n_ptr) {
246 tipc_node_lock(n_ptr);
247 l_ptr = n_ptr->active_links[0];
248 if (l_ptr)
249 max_item_buf = ((l_ptr->max_pkt - INT_H_SIZE) /
250 ITEM_SIZE) * ITEM_SIZE;
251 tipc_node_unlock(n_ptr);
252 }
253 read_unlock_bh(&tipc_net_lock);
254 if (!max_item_buf)
255 return;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100256
Allan Stephens9aa88c22011-05-31 13:38:02 -0400257 /* create list of publication messages, then send them as a unit */
Allan Stephens9aa88c22011-05-31 13:38:02 -0400258 INIT_LIST_HEAD(&message_list);
259
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900260 read_lock_bh(&tipc_nametbl_lock);
Allan Stephense11aa052012-04-17 17:57:52 -0400261 named_distribute(&message_list, node, &publ_cluster, max_item_buf);
Allan Stephensa9098042012-04-17 17:57:52 -0400262 named_distribute(&message_list, node, &publ_zone, max_item_buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900263 read_unlock_bh(&tipc_nametbl_lock);
Allan Stephens9aa88c22011-05-31 13:38:02 -0400264
Ying Xue4cb7d552012-11-16 13:51:32 +0800265 tipc_link_send_names(&message_list, node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100266}
267
268/**
Allan Stephensf1379172011-02-23 14:13:41 -0500269 * named_purge_publ - remove publication associated with a failed node
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900270 *
271 * Invoked for each publication issued by a newly failed node.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272 * Removes publication structure from name table & deletes it.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100273 */
Allan Stephensf1379172011-02-23 14:13:41 -0500274static void named_purge_publ(struct publication *publ)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275{
276 struct publication *p;
Allan Stephensf1310722006-06-25 23:51:37 -0700277
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900278 write_lock_bh(&tipc_nametbl_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900279 p = tipc_nametbl_remove_publ(publ->type, publ->lower,
Per Liden4323add2006-01-18 00:38:21 +0100280 publ->node, publ->ref, publ->key);
Allan Stephens431697e2011-02-23 13:51:15 -0500281 if (p)
282 tipc_nodesub_unsubscribe(&p->subscr);
Per Liden4323add2006-01-18 00:38:21 +0100283 write_unlock_bh(&tipc_nametbl_lock);
Allan Stephensf1310722006-06-25 23:51:37 -0700284
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900285 if (p != publ) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400286 pr_err("Unable to remove publication from failed node\n"
287 " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
288 publ->type, publ->lower, publ->node, publ->ref,
289 publ->key);
Allan Stephensf1310722006-06-25 23:51:37 -0700290 }
291
Allan Stephense83504f2010-12-31 18:59:30 +0000292 kfree(p);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293}
294
295/**
Per Liden4323add2006-01-18 00:38:21 +0100296 * tipc_named_recv - process name table update message sent by another node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297 */
Per Liden4323add2006-01-18 00:38:21 +0100298void tipc_named_recv(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100299{
300 struct publication *publ;
301 struct tipc_msg *msg = buf_msg(buf);
302 struct distr_item *item = (struct distr_item *)msg_data(msg);
303 u32 count = msg_data_sz(msg) / ITEM_SIZE;
304
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900305 write_lock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100306 while (count--) {
307 if (msg_type(msg) == PUBLICATION) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900308 publ = tipc_nametbl_insert_publ(ntohl(item->type),
Per Liden4323add2006-01-18 00:38:21 +0100309 ntohl(item->lower),
310 ntohl(item->upper),
311 TIPC_CLUSTER_SCOPE,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900312 msg_orignode(msg),
Per Liden4323add2006-01-18 00:38:21 +0100313 ntohl(item->ref),
314 ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315 if (publ) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900316 tipc_nodesub_subscribe(&publ->subscr,
317 msg_orignode(msg),
Per Liden4323add2006-01-18 00:38:21 +0100318 publ,
Allan Stephensf1379172011-02-23 14:13:41 -0500319 (net_ev_handler)
320 named_purge_publ);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100321 }
322 } else if (msg_type(msg) == WITHDRAWAL) {
Per Liden4323add2006-01-18 00:38:21 +0100323 publ = tipc_nametbl_remove_publ(ntohl(item->type),
324 ntohl(item->lower),
325 msg_orignode(msg),
326 ntohl(item->ref),
327 ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100328
329 if (publ) {
Per Liden4323add2006-01-18 00:38:21 +0100330 tipc_nodesub_unsubscribe(&publ->subscr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900331 kfree(publ);
Allan Stephensf1310722006-06-25 23:51:37 -0700332 } else {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400333 pr_err("Unable to remove publication by node 0x%x\n"
334 " (type=%u, lower=%u, ref=%u, key=%u)\n",
335 msg_orignode(msg), ntohl(item->type),
336 ntohl(item->lower), ntohl(item->ref),
337 ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100338 }
339 } else {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400340 pr_warn("Unrecognized name table message received\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100341 }
342 item++;
343 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900344 write_unlock_bh(&tipc_nametbl_lock);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400345 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100346}
347
348/**
Allan Stephens1110b8d2012-04-17 17:57:52 -0400349 * tipc_named_reinit - re-initialize local publications
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900350 *
Allan Stephens945af1c2011-10-14 14:42:25 -0400351 * This routine is called whenever TIPC networking is enabled.
Allan Stephens1110b8d2012-04-17 17:57:52 -0400352 * All name table entries published by this node are updated to reflect
353 * the node's new network address.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100354 */
Per Liden4323add2006-01-18 00:38:21 +0100355void tipc_named_reinit(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356{
357 struct publication *publ;
Allan Stephensa9098042012-04-17 17:57:52 -0400358 int scope;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100359
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900360 write_lock_bh(&tipc_nametbl_lock);
Allan Stephens945af1c2011-10-14 14:42:25 -0400361
Allan Stephens1110b8d2012-04-17 17:57:52 -0400362 for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
Allan Stephensa9098042012-04-17 17:57:52 -0400363 list_for_each_entry(publ, &publ_lists[scope]->list, local_list)
364 publ->node = tipc_own_addr;
Allan Stephens945af1c2011-10-14 14:42:25 -0400365
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900366 write_unlock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367}