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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
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 */
61
62struct distr_item {
Al Viro3e6c8cd2006-11-08 00:19:09 -080063 __be32 type;
64 __be32 lower;
65 __be32 upper;
66 __be32 ref;
67 __be32 key;
Per Lidenb97bf3f2006-01-02 19:04:38 +010068};
69
70/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090071 * List of externally visible publications by this node --
Per Lidenb97bf3f2006-01-02 19:04:38 +010072 * that is, all publications having scope > TIPC_NODE_SCOPE.
73 */
74
75static LIST_HEAD(publ_root);
Allan Stephense3ec9c72010-12-31 18:59:34 +000076static u32 publ_cnt;
Per Lidenb97bf3f2006-01-02 19:04:38 +010077
78/**
79 * publ_to_item - add publication info to a publication message
80 */
81
82static void publ_to_item(struct distr_item *i, struct publication *p)
83{
84 i->type = htonl(p->type);
85 i->lower = htonl(p->lower);
86 i->upper = htonl(p->upper);
87 i->ref = htonl(p->ref);
88 i->key = htonl(p->key);
Per Lidenb97bf3f2006-01-02 19:04:38 +010089}
90
91/**
92 * named_prepare_buf - allocate & initialize a publication message
93 */
94
95static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest)
96{
stephen hemminger31e3c3f2010-10-13 13:20:35 +000097 struct sk_buff *buf = tipc_buf_acquire(LONG_H_SIZE + size);
Per Lidenb97bf3f2006-01-02 19:04:38 +010098 struct tipc_msg *msg;
99
100 if (buf != NULL) {
101 msg = buf_msg(buf);
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000102 tipc_msg_init(msg, NAME_DISTRIBUTOR, type, LONG_H_SIZE, dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103 msg_set_size(msg, LONG_H_SIZE + size);
104 }
105 return buf;
106}
107
Allan Stephens8f92df62010-12-31 18:59:19 +0000108static void named_cluster_distribute(struct sk_buff *buf)
109{
110 struct sk_buff *buf_copy;
111 struct tipc_node *n_ptr;
112 u32 n_num;
113
114 for (n_num = 1; n_num <= tipc_net.highest_node; n_num++) {
115 n_ptr = tipc_net.nodes[n_num];
116 if (n_ptr && tipc_node_has_active_links(n_ptr)) {
117 buf_copy = skb_copy(buf, GFP_ATOMIC);
118 if (!buf_copy)
119 break;
120 msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
121 tipc_link_send(buf_copy, n_ptr->addr, n_ptr->addr);
122 }
123 }
124
125 buf_discard(buf);
126}
127
Per Lidenb97bf3f2006-01-02 19:04:38 +0100128/**
Per Liden4323add2006-01-18 00:38:21 +0100129 * tipc_named_publish - tell other nodes about a new publication by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100130 */
131
Per Liden4323add2006-01-18 00:38:21 +0100132void tipc_named_publish(struct publication *publ)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100133{
134 struct sk_buff *buf;
135 struct distr_item *item;
136
Allan Stephens08c31f72006-10-16 21:56:04 -0700137 list_add_tail(&publ->local_list, &publ_root);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138 publ_cnt++;
139
140 buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0);
141 if (!buf) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700142 warn("Publication distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100143 return;
144 }
145
146 item = (struct distr_item *)msg_data(buf_msg(buf));
147 publ_to_item(item, publ);
Allan Stephens8f92df62010-12-31 18:59:19 +0000148 named_cluster_distribute(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100149}
150
151/**
Per Liden4323add2006-01-18 00:38:21 +0100152 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100153 */
154
Per Liden4323add2006-01-18 00:38:21 +0100155void tipc_named_withdraw(struct publication *publ)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100156{
157 struct sk_buff *buf;
158 struct distr_item *item;
159
160 list_del(&publ->local_list);
161 publ_cnt--;
162
163 buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0);
164 if (!buf) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700165 warn("Withdrawl distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100166 return;
167 }
168
169 item = (struct distr_item *)msg_data(buf_msg(buf));
170 publ_to_item(item, publ);
Allan Stephens8f92df62010-12-31 18:59:19 +0000171 named_cluster_distribute(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172}
173
174/**
Per Liden4323add2006-01-18 00:38:21 +0100175 * tipc_named_node_up - tell specified node about all publications by this node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100176 */
177
Per Liden4323add2006-01-18 00:38:21 +0100178void tipc_named_node_up(unsigned long node)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100179{
180 struct publication *publ;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800181 struct distr_item *item = NULL;
182 struct sk_buff *buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183 u32 left = 0;
184 u32 rest;
185 u32 max_item_buf;
186
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900187 read_lock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100188 max_item_buf = TIPC_MAX_USER_MSG_SIZE / ITEM_SIZE;
189 max_item_buf *= ITEM_SIZE;
190 rest = publ_cnt * ITEM_SIZE;
191
192 list_for_each_entry(publ, &publ_root, local_list) {
193 if (!buf) {
194 left = (rest <= max_item_buf) ? rest : max_item_buf;
195 rest -= left;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900196 buf = named_prepare_buf(PUBLICATION, left, node);
Allan Stephensa10bd922006-06-25 23:52:17 -0700197 if (!buf) {
198 warn("Bulk publication distribution failure\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100199 goto exit;
200 }
201 item = (struct distr_item *)msg_data(buf_msg(buf));
202 }
203 publ_to_item(item, publ);
204 item++;
205 left -= ITEM_SIZE;
206 if (!left) {
207 msg_set_link_selector(buf_msg(buf), node);
Per Liden4323add2006-01-18 00:38:21 +0100208 tipc_link_send(buf, node, node);
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800209 buf = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100210 }
211 }
212exit:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900213 read_unlock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100214}
215
216/**
217 * node_is_down - remove publication associated with a failed node
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900218 *
219 * Invoked for each publication issued by a newly failed node.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100220 * Removes publication structure from name table & deletes it.
221 * In rare cases the link may have come back up again when this
222 * function is called, and we have two items representing the same
223 * publication. Nudge this item's key to distinguish it from the other.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100224 */
225
226static void node_is_down(struct publication *publ)
227{
228 struct publication *p;
Allan Stephensf1310722006-06-25 23:51:37 -0700229
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900230 write_lock_bh(&tipc_nametbl_lock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900231 publ->key += 1222345;
232 p = tipc_nametbl_remove_publ(publ->type, publ->lower,
Per Liden4323add2006-01-18 00:38:21 +0100233 publ->node, publ->ref, publ->key);
Allan Stephens431697e2011-02-23 13:51:15 -0500234 if (p)
235 tipc_nodesub_unsubscribe(&p->subscr);
Per Liden4323add2006-01-18 00:38:21 +0100236 write_unlock_bh(&tipc_nametbl_lock);
Allan Stephensf1310722006-06-25 23:51:37 -0700237
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900238 if (p != publ) {
Allan Stephensf1310722006-06-25 23:51:37 -0700239 err("Unable to remove publication from failed node\n"
240 "(type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
241 publ->type, publ->lower, publ->node, publ->ref, publ->key);
242 }
243
Allan Stephense83504f2010-12-31 18:59:30 +0000244 kfree(p);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100245}
246
247/**
Per Liden4323add2006-01-18 00:38:21 +0100248 * tipc_named_recv - process name table update message sent by another node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249 */
250
Per Liden4323add2006-01-18 00:38:21 +0100251void tipc_named_recv(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100252{
253 struct publication *publ;
254 struct tipc_msg *msg = buf_msg(buf);
255 struct distr_item *item = (struct distr_item *)msg_data(msg);
256 u32 count = msg_data_sz(msg) / ITEM_SIZE;
257
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900258 write_lock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259 while (count--) {
260 if (msg_type(msg) == PUBLICATION) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900261 publ = tipc_nametbl_insert_publ(ntohl(item->type),
Per Liden4323add2006-01-18 00:38:21 +0100262 ntohl(item->lower),
263 ntohl(item->upper),
264 TIPC_CLUSTER_SCOPE,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900265 msg_orignode(msg),
Per Liden4323add2006-01-18 00:38:21 +0100266 ntohl(item->ref),
267 ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100268 if (publ) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900269 tipc_nodesub_subscribe(&publ->subscr,
270 msg_orignode(msg),
Per Liden4323add2006-01-18 00:38:21 +0100271 publ,
272 (net_ev_handler)node_is_down);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100273 }
274 } else if (msg_type(msg) == WITHDRAWAL) {
Per Liden4323add2006-01-18 00:38:21 +0100275 publ = tipc_nametbl_remove_publ(ntohl(item->type),
276 ntohl(item->lower),
277 msg_orignode(msg),
278 ntohl(item->ref),
279 ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100280
281 if (publ) {
Per Liden4323add2006-01-18 00:38:21 +0100282 tipc_nodesub_unsubscribe(&publ->subscr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900283 kfree(publ);
Allan Stephensf1310722006-06-25 23:51:37 -0700284 } else {
285 err("Unable to remove publication by node 0x%x\n"
286 "(type=%u, lower=%u, ref=%u, key=%u)\n",
287 msg_orignode(msg),
288 ntohl(item->type), ntohl(item->lower),
289 ntohl(item->ref), ntohl(item->key));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100290 }
291 } else {
Allan Stephensa10bd922006-06-25 23:52:17 -0700292 warn("Unrecognized name table message received\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293 }
294 item++;
295 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900296 write_unlock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297 buf_discard(buf);
298}
299
300/**
Per Liden4323add2006-01-18 00:38:21 +0100301 * tipc_named_reinit - re-initialize local publication list
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900302 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100303 * This routine is called whenever TIPC networking is (re)enabled.
304 * All existing publications by this node that have "cluster" or "zone" scope
305 * are updated to reflect the node's current network address.
306 * (If the node's address is unchanged, the update loop terminates immediately.)
307 */
308
Per Liden4323add2006-01-18 00:38:21 +0100309void tipc_named_reinit(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100310{
311 struct publication *publ;
312
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900313 write_lock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100314 list_for_each_entry(publ, &publ_root, local_list) {
315 if (publ->node == tipc_own_addr)
316 break;
317 publ->node = tipc_own_addr;
318 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900319 write_unlock_bh(&tipc_nametbl_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100320}