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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
Per Lidenb97bf3f2006-01-02 19:04:38 +01005 * Copyright (c) 2005, 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"
38#include "cluster.h"
39#include "dbg.h"
40#include "link.h"
41#include "msg.h"
42#include "name_distr.h"
43
Per Lidenb97bf3f2006-01-02 19:04:38 +010044#define ITEM_SIZE sizeof(struct distr_item)
45
46/**
47 * struct distr_item - publication info distributed to other nodes
48 * @type: name sequence type
49 * @lower: name sequence lower bound
50 * @upper: name sequence upper bound
51 * @ref: publishing port reference
52 * @key: publication key
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090053 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010054 * ===> All fields are stored in network byte order. <===
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090055 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010056 * First 3 fields identify (name or) name sequence being published.
57 * Reference field uniquely identifies port that published name sequence.
58 * Key field uniquely identifies publication, in the event a port has
59 * multiple publications of the same name sequence.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090060 *
61 * Note: There is no field that identifies the publishing node because it is
Per Lidenb97bf3f2006-01-02 19:04:38 +010062 * the same for all items contained within a publication message.
63 */
64
65struct distr_item {
Al Viro3e6c8cd2006-11-08 00:19:09 -080066 __be32 type;
67 __be32 lower;
68 __be32 upper;
69 __be32 ref;
70 __be32 key;
Per Lidenb97bf3f2006-01-02 19:04:38 +010071};
72
73/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090074 * List of externally visible publications by this node --
Per Lidenb97bf3f2006-01-02 19:04:38 +010075 * that is, all publications having scope > TIPC_NODE_SCOPE.
76 */
77
78static LIST_HEAD(publ_root);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090079static u32 publ_cnt = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +010080
81/**
82 * publ_to_item - add publication info to a publication message
83 */
84
85static void publ_to_item(struct distr_item *i, struct publication *p)
86{
87 i->type = htonl(p->type);
88 i->lower = htonl(p->lower);
89 i->upper = htonl(p->upper);
90 i->ref = htonl(p->ref);
91 i->key = htonl(p->key);
92 dbg("publ_to_item: %u, %u, %u\n", p->type, p->lower, p->upper);
93}
94
95/**
96 * named_prepare_buf - allocate & initialize a publication message
97 */
98
99static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest)
100{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900101 struct sk_buff *buf = buf_acquire(LONG_H_SIZE + size);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100102 struct tipc_msg *msg;
103
104 if (buf != NULL) {
105 msg = buf_msg(buf);
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000106 tipc_msg_init(msg, NAME_DISTRIBUTOR, type, LONG_H_SIZE, dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100107 msg_set_size(msg, LONG_H_SIZE + size);
108 }
109 return buf;
110}
111
112/**
Per Liden4323add2006-01-18 00:38:21 +0100113 * tipc_named_publish - tell other nodes about a new publication by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100114 */
115
Per Liden4323add2006-01-18 00:38:21 +0100116void tipc_named_publish(struct publication *publ)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117{
118 struct sk_buff *buf;
119 struct distr_item *item;
120
Allan Stephens08c31f72006-10-16 21:56:04 -0700121 list_add_tail(&publ->local_list, &publ_root);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122 publ_cnt++;
123
124 buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0);
125 if (!buf) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700126 warn("Publication distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127 return;
128 }
129
130 item = (struct distr_item *)msg_data(buf_msg(buf));
131 publ_to_item(item, publ);
Per Liden4323add2006-01-18 00:38:21 +0100132 dbg("tipc_named_withdraw: broadcasting publish msg\n");
133 tipc_cltr_broadcast(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100134}
135
136/**
Per Liden4323add2006-01-18 00:38:21 +0100137 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138 */
139
Per Liden4323add2006-01-18 00:38:21 +0100140void tipc_named_withdraw(struct publication *publ)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100141{
142 struct sk_buff *buf;
143 struct distr_item *item;
144
145 list_del(&publ->local_list);
146 publ_cnt--;
147
148 buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0);
149 if (!buf) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700150 warn("Withdrawl distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100151 return;
152 }
153
154 item = (struct distr_item *)msg_data(buf_msg(buf));
155 publ_to_item(item, publ);
Per Liden4323add2006-01-18 00:38:21 +0100156 dbg("tipc_named_withdraw: broadcasting withdraw msg\n");
157 tipc_cltr_broadcast(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100158}
159
160/**
Per Liden4323add2006-01-18 00:38:21 +0100161 * tipc_named_node_up - tell specified node about all publications by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100162 */
163
Per Liden4323add2006-01-18 00:38:21 +0100164void tipc_named_node_up(unsigned long node)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100165{
166 struct publication *publ;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800167 struct distr_item *item = NULL;
168 struct sk_buff *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169 u32 left = 0;
170 u32 rest;
171 u32 max_item_buf;
172
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900173 read_lock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174 max_item_buf = TIPC_MAX_USER_MSG_SIZE / ITEM_SIZE;
175 max_item_buf *= ITEM_SIZE;
176 rest = publ_cnt * ITEM_SIZE;
177
178 list_for_each_entry(publ, &publ_root, local_list) {
179 if (!buf) {
180 left = (rest <= max_item_buf) ? rest : max_item_buf;
181 rest -= left;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900182 buf = named_prepare_buf(PUBLICATION, left, node);
Allan Stephensa10bd922006-06-25 23:52:17 -0700183 if (!buf) {
184 warn("Bulk publication distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100185 goto exit;
186 }
187 item = (struct distr_item *)msg_data(buf_msg(buf));
188 }
189 publ_to_item(item, publ);
190 item++;
191 left -= ITEM_SIZE;
192 if (!left) {
193 msg_set_link_selector(buf_msg(buf), node);
Per Liden4323add2006-01-18 00:38:21 +0100194 dbg("tipc_named_node_up: sending publish msg to "
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900195 "<%u.%u.%u>\n", tipc_zone(node),
Per Lidenb97bf3f2006-01-02 19:04:38 +0100196 tipc_cluster(node), tipc_node(node));
Per Liden4323add2006-01-18 00:38:21 +0100197 tipc_link_send(buf, node, node);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800198 buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100199 }
200 }
201exit:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900202 read_unlock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100203}
204
205/**
206 * node_is_down - remove publication associated with a failed node
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900207 *
208 * Invoked for each publication issued by a newly failed node.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100209 * Removes publication structure from name table & deletes it.
210 * In rare cases the link may have come back up again when this
211 * function is called, and we have two items representing the same
212 * publication. Nudge this item's key to distinguish it from the other.
213 * (Note: Publication's node subscription is already unsubscribed.)
214 */
215
216static void node_is_down(struct publication *publ)
217{
218 struct publication *p;
Allan Stephensf1310722006-06-25 23:51:37 -0700219
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900220 write_lock_bh(&tipc_nametbl_lock);
221 dbg("node_is_down: withdrawing %u, %u, %u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100222 publ->type, publ->lower, publ->upper);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900223 publ->key += 1222345;
224 p = tipc_nametbl_remove_publ(publ->type, publ->lower,
Per Liden4323add2006-01-18 00:38:21 +0100225 publ->node, publ->ref, publ->key);
Per Liden4323add2006-01-18 00:38:21 +0100226 write_unlock_bh(&tipc_nametbl_lock);
Allan Stephensf1310722006-06-25 23:51:37 -0700227
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900228 if (p != publ) {
Allan Stephensf1310722006-06-25 23:51:37 -0700229 err("Unable to remove publication from failed node\n"
230 "(type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
231 publ->type, publ->lower, publ->node, publ->ref, publ->key);
232 }
233
234 if (p) {
235 kfree(p);
236 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100237}
238
239/**
Per Liden4323add2006-01-18 00:38:21 +0100240 * tipc_named_recv - process name table update message sent by another node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100241 */
242
Per Liden4323add2006-01-18 00:38:21 +0100243void tipc_named_recv(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100244{
245 struct publication *publ;
246 struct tipc_msg *msg = buf_msg(buf);
247 struct distr_item *item = (struct distr_item *)msg_data(msg);
248 u32 count = msg_data_sz(msg) / ITEM_SIZE;
249
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900250 write_lock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100251 while (count--) {
252 if (msg_type(msg) == PUBLICATION) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900253 dbg("tipc_named_recv: got publication for %u, %u, %u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254 ntohl(item->type), ntohl(item->lower),
255 ntohl(item->upper));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900256 publ = tipc_nametbl_insert_publ(ntohl(item->type),
Per Liden4323add2006-01-18 00:38:21 +0100257 ntohl(item->lower),
258 ntohl(item->upper),
259 TIPC_CLUSTER_SCOPE,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900260 msg_orignode(msg),
Per Liden4323add2006-01-18 00:38:21 +0100261 ntohl(item->ref),
262 ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100263 if (publ) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900264 tipc_nodesub_subscribe(&publ->subscr,
265 msg_orignode(msg),
Per Liden4323add2006-01-18 00:38:21 +0100266 publ,
267 (net_ev_handler)node_is_down);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100268 }
269 } else if (msg_type(msg) == WITHDRAWAL) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900270 dbg("tipc_named_recv: got withdrawl for %u, %u, %u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100271 ntohl(item->type), ntohl(item->lower),
272 ntohl(item->upper));
Per Liden4323add2006-01-18 00:38:21 +0100273 publ = tipc_nametbl_remove_publ(ntohl(item->type),
274 ntohl(item->lower),
275 msg_orignode(msg),
276 ntohl(item->ref),
277 ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100278
279 if (publ) {
Per Liden4323add2006-01-18 00:38:21 +0100280 tipc_nodesub_unsubscribe(&publ->subscr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900281 kfree(publ);
Allan Stephensf1310722006-06-25 23:51:37 -0700282 } else {
283 err("Unable to remove publication by node 0x%x\n"
284 "(type=%u, lower=%u, ref=%u, key=%u)\n",
285 msg_orignode(msg),
286 ntohl(item->type), ntohl(item->lower),
287 ntohl(item->ref), ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100288 }
289 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -0700290 warn("Unrecognized name table message received\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291 }
292 item++;
293 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900294 write_unlock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100295 buf_discard(buf);
296}
297
298/**
Per Liden4323add2006-01-18 00:38:21 +0100299 * tipc_named_reinit - re-initialize local publication list
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900300 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301 * This routine is called whenever TIPC networking is (re)enabled.
302 * All existing publications by this node that have "cluster" or "zone" scope
303 * are updated to reflect the node's current network address.
304 * (If the node's address is unchanged, the update loop terminates immediately.)
305 */
306
Per Liden4323add2006-01-18 00:38:21 +0100307void tipc_named_reinit(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100308{
309 struct publication *publ;
310
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900311 write_lock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100312 list_for_each_entry(publ, &publ_root, local_list) {
313 if (publ->node == tipc_own_addr)
314 break;
315 publ->node = tipc_own_addr;
316 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900317 write_unlock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100318}