2 * net/tipc/name_distr.c: TIPC name distribution code
4 * Copyright (c) 2000-2006, Ericsson AB
5 * Copyright (c) 2005, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
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.
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.
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
34 * POSSIBILITY OF SUCH DAMAGE.
42 #include "name_distr.h"
44 #define ITEM_SIZE sizeof(struct distr_item)
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
54 * ===> All fields are stored in network byte order. <===
56 * 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.
61 * Note: There is no field that identifies the publishing node because it is
62 * the same for all items contained within a publication message.
74 * List of externally visible publications by this node --
75 * that is, all publications having scope > TIPC_NODE_SCOPE.
78 static LIST_HEAD(publ_root
);
79 static u32 publ_cnt
= 0;
82 * publ_to_item - add publication info to a publication message
85 static void publ_to_item(struct distr_item
*i
, struct publication
*p
)
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
);
96 * named_prepare_buf - allocate & initialize a publication message
99 static struct sk_buff
*named_prepare_buf(u32 type
, u32 size
, u32 dest
)
101 struct sk_buff
*buf
= buf_acquire(LONG_H_SIZE
+ size
);
102 struct tipc_msg
*msg
;
106 msg_init(msg
, NAME_DISTRIBUTOR
, type
, TIPC_OK
,
108 msg_set_size(msg
, LONG_H_SIZE
+ size
);
114 * tipc_named_publish - tell other nodes about a new publication by this node
117 void tipc_named_publish(struct publication
*publ
)
120 struct distr_item
*item
;
122 list_add_tail(&publ
->local_list
, &publ_root
);
125 buf
= named_prepare_buf(PUBLICATION
, ITEM_SIZE
, 0);
127 warn("Publication distribution failure\n");
131 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
132 publ_to_item(item
, publ
);
133 dbg("tipc_named_withdraw: broadcasting publish msg\n");
134 tipc_cltr_broadcast(buf
);
138 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
141 void tipc_named_withdraw(struct publication
*publ
)
144 struct distr_item
*item
;
146 list_del(&publ
->local_list
);
149 buf
= named_prepare_buf(WITHDRAWAL
, ITEM_SIZE
, 0);
151 warn("Withdrawl distribution failure\n");
155 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
156 publ_to_item(item
, publ
);
157 dbg("tipc_named_withdraw: broadcasting withdraw msg\n");
158 tipc_cltr_broadcast(buf
);
162 * tipc_named_node_up - tell specified node about all publications by this node
165 void tipc_named_node_up(unsigned long node
)
167 struct publication
*publ
;
168 struct distr_item
*item
= NULL
;
169 struct sk_buff
*buf
= NULL
;
174 read_lock_bh(&tipc_nametbl_lock
);
175 max_item_buf
= TIPC_MAX_USER_MSG_SIZE
/ ITEM_SIZE
;
176 max_item_buf
*= ITEM_SIZE
;
177 rest
= publ_cnt
* ITEM_SIZE
;
179 list_for_each_entry(publ
, &publ_root
, local_list
) {
181 left
= (rest
<= max_item_buf
) ? rest
: max_item_buf
;
183 buf
= named_prepare_buf(PUBLICATION
, left
, node
);
185 warn("Bulk publication distribution failure\n");
188 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
190 publ_to_item(item
, publ
);
194 msg_set_link_selector(buf_msg(buf
), node
);
195 dbg("tipc_named_node_up: sending publish msg to "
196 "<%u.%u.%u>\n", tipc_zone(node
),
197 tipc_cluster(node
), tipc_node(node
));
198 tipc_link_send(buf
, node
, node
);
203 read_unlock_bh(&tipc_nametbl_lock
);
207 * node_is_down - remove publication associated with a failed node
209 * Invoked for each publication issued by a newly failed node.
210 * Removes publication structure from name table & deletes it.
211 * In rare cases the link may have come back up again when this
212 * function is called, and we have two items representing the same
213 * publication. Nudge this item's key to distinguish it from the other.
214 * (Note: Publication's node subscription is already unsubscribed.)
217 static void node_is_down(struct publication
*publ
)
219 struct publication
*p
;
221 write_lock_bh(&tipc_nametbl_lock
);
222 dbg("node_is_down: withdrawing %u, %u, %u\n",
223 publ
->type
, publ
->lower
, publ
->upper
);
224 publ
->key
+= 1222345;
225 p
= tipc_nametbl_remove_publ(publ
->type
, publ
->lower
,
226 publ
->node
, publ
->ref
, publ
->key
);
227 write_unlock_bh(&tipc_nametbl_lock
);
230 err("Unable to remove publication from failed node\n"
231 "(type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
232 publ
->type
, publ
->lower
, publ
->node
, publ
->ref
, publ
->key
);
241 * tipc_named_recv - process name table update message sent by another node
244 void tipc_named_recv(struct sk_buff
*buf
)
246 struct publication
*publ
;
247 struct tipc_msg
*msg
= buf_msg(buf
);
248 struct distr_item
*item
= (struct distr_item
*)msg_data(msg
);
249 u32 count
= msg_data_sz(msg
) / ITEM_SIZE
;
251 write_lock_bh(&tipc_nametbl_lock
);
253 if (msg_type(msg
) == PUBLICATION
) {
254 dbg("tipc_named_recv: got publication for %u, %u, %u\n",
255 ntohl(item
->type
), ntohl(item
->lower
),
257 publ
= tipc_nametbl_insert_publ(ntohl(item
->type
),
265 tipc_nodesub_subscribe(&publ
->subscr
,
268 (net_ev_handler
)node_is_down
);
270 } else if (msg_type(msg
) == WITHDRAWAL
) {
271 dbg("tipc_named_recv: got withdrawl for %u, %u, %u\n",
272 ntohl(item
->type
), ntohl(item
->lower
),
274 publ
= tipc_nametbl_remove_publ(ntohl(item
->type
),
281 tipc_nodesub_unsubscribe(&publ
->subscr
);
284 err("Unable to remove publication by node 0x%x\n"
285 "(type=%u, lower=%u, ref=%u, key=%u)\n",
287 ntohl(item
->type
), ntohl(item
->lower
),
288 ntohl(item
->ref
), ntohl(item
->key
));
291 warn("Unrecognized name table message received\n");
295 write_unlock_bh(&tipc_nametbl_lock
);
300 * tipc_named_reinit - re-initialize local publication list
302 * This routine is called whenever TIPC networking is (re)enabled.
303 * All existing publications by this node that have "cluster" or "zone" scope
304 * are updated to reflect the node's current network address.
305 * (If the node's address is unchanged, the update loop terminates immediately.)
308 void tipc_named_reinit(void)
310 struct publication
*publ
;
312 write_lock_bh(&tipc_nametbl_lock
);
313 list_for_each_entry(publ
, &publ_root
, local_list
) {
314 if (publ
->node
== tipc_own_addr
)
316 publ
->node
= tipc_own_addr
;
318 write_unlock_bh(&tipc_nametbl_lock
);