2 * net/tipc/name_distr.c: TIPC name distribution code
4 * Copyright (c) 2000-2006, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, 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.
39 #include "name_distr.h"
42 * struct publ_list - list of publications made by this node
43 * @list: circular list of publications
44 * @list_size: number of entries in list
47 struct list_head list
;
51 static struct publ_list publ_zone
= {
52 .list
= LIST_HEAD_INIT(publ_zone
.list
),
56 static struct publ_list publ_cluster
= {
57 .list
= LIST_HEAD_INIT(publ_cluster
.list
),
61 static struct publ_list publ_node
= {
62 .list
= LIST_HEAD_INIT(publ_node
.list
),
66 static struct publ_list
*publ_lists
[] = {
68 &publ_zone
, /* publ_lists[TIPC_ZONE_SCOPE] */
69 &publ_cluster
, /* publ_lists[TIPC_CLUSTER_SCOPE] */
70 &publ_node
/* publ_lists[TIPC_NODE_SCOPE] */
75 * publ_to_item - add publication info to a publication message
77 static void publ_to_item(struct distr_item
*i
, struct publication
*p
)
79 i
->type
= htonl(p
->type
);
80 i
->lower
= htonl(p
->lower
);
81 i
->upper
= htonl(p
->upper
);
82 i
->ref
= htonl(p
->ref
);
83 i
->key
= htonl(p
->key
);
87 * named_prepare_buf - allocate & initialize a publication message
89 static struct sk_buff
*named_prepare_buf(u32 type
, u32 size
, u32 dest
)
91 struct sk_buff
*buf
= tipc_buf_acquire(INT_H_SIZE
+ size
);
96 tipc_msg_init(msg
, NAME_DISTRIBUTOR
, type
, INT_H_SIZE
, dest
);
97 msg_set_size(msg
, INT_H_SIZE
+ size
);
102 void named_cluster_distribute(struct sk_buff
*buf
)
104 struct sk_buff
*obuf
;
105 struct tipc_node
*node
;
109 list_for_each_entry_rcu(node
, &tipc_node_list
, list
) {
111 if (in_own_node(dnode
))
113 if (!tipc_node_active_links(node
))
115 obuf
= skb_copy(buf
, GFP_ATOMIC
);
118 msg_set_destnode(buf_msg(obuf
), dnode
);
119 tipc_link_xmit(obuf
, dnode
, dnode
);
127 * tipc_named_publish - tell other nodes about a new publication by this node
129 struct sk_buff
*tipc_named_publish(struct publication
*publ
)
132 struct distr_item
*item
;
134 list_add_tail(&publ
->local_list
, &publ_lists
[publ
->scope
]->list
);
135 publ_lists
[publ
->scope
]->size
++;
137 if (publ
->scope
== TIPC_NODE_SCOPE
)
140 buf
= named_prepare_buf(PUBLICATION
, ITEM_SIZE
, 0);
142 pr_warn("Publication distribution failure\n");
146 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
147 publ_to_item(item
, publ
);
152 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
154 struct sk_buff
*tipc_named_withdraw(struct publication
*publ
)
157 struct distr_item
*item
;
159 list_del(&publ
->local_list
);
160 publ_lists
[publ
->scope
]->size
--;
162 if (publ
->scope
== TIPC_NODE_SCOPE
)
165 buf
= named_prepare_buf(WITHDRAWAL
, ITEM_SIZE
, 0);
167 pr_warn("Withdrawal distribution failure\n");
171 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
172 publ_to_item(item
, publ
);
177 * named_distribute - prepare name info for bulk distribution to another node
178 * @msg_list: list of messages (buffers) to be returned from this function
179 * @dnode: node to be updated
180 * @pls: linked list of publication items to be packed into buffer chain
182 static void named_distribute(struct list_head
*msg_list
, u32 dnode
,
183 struct publ_list
*pls
)
185 struct publication
*publ
;
186 struct sk_buff
*buf
= NULL
;
187 struct distr_item
*item
= NULL
;
188 uint dsz
= pls
->size
* ITEM_SIZE
;
189 uint msg_dsz
= (tipc_node_get_mtu(dnode
, 0) / ITEM_SIZE
) * ITEM_SIZE
;
193 list_for_each_entry(publ
, &pls
->list
, local_list
) {
194 /* Prepare next buffer: */
196 msg_rem
= min_t(uint
, rem
, msg_dsz
);
198 buf
= named_prepare_buf(PUBLICATION
, msg_rem
, dnode
);
200 pr_warn("Bulk publication failure\n");
203 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
206 /* Pack publication into message: */
207 publ_to_item(item
, publ
);
209 msg_rem
-= ITEM_SIZE
;
211 /* Append full buffer to list: */
213 list_add_tail((struct list_head
*)buf
, msg_list
);
220 * tipc_named_node_up - tell specified node about all publications by this node
222 void tipc_named_node_up(u32 dnode
)
225 struct sk_buff
*buf_chain
;
227 read_lock_bh(&tipc_nametbl_lock
);
228 named_distribute(&msg_list
, dnode
, &publ_cluster
);
229 named_distribute(&msg_list
, dnode
, &publ_zone
);
230 read_unlock_bh(&tipc_nametbl_lock
);
232 /* Convert circular list to linear list and send: */
233 buf_chain
= (struct sk_buff
*)msg_list
.next
;
234 ((struct sk_buff
*)msg_list
.prev
)->next
= NULL
;
235 tipc_link_xmit(buf_chain
, dnode
, dnode
);
239 * named_purge_publ - remove publication associated with a failed node
241 * Invoked for each publication issued by a newly failed node.
242 * Removes publication structure from name table & deletes it.
244 static void named_purge_publ(struct publication
*publ
)
246 struct publication
*p
;
248 write_lock_bh(&tipc_nametbl_lock
);
249 p
= tipc_nametbl_remove_publ(publ
->type
, publ
->lower
,
250 publ
->node
, publ
->ref
, publ
->key
);
252 tipc_nodesub_unsubscribe(&p
->subscr
);
253 write_unlock_bh(&tipc_nametbl_lock
);
256 pr_err("Unable to remove publication from failed node\n"
257 " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
258 publ
->type
, publ
->lower
, publ
->node
, publ
->ref
,
266 * tipc_named_rcv - process name table update message sent by another node
268 void tipc_named_rcv(struct sk_buff
*buf
)
270 struct publication
*publ
;
271 struct tipc_msg
*msg
= buf_msg(buf
);
272 struct distr_item
*item
= (struct distr_item
*)msg_data(msg
);
273 u32 count
= msg_data_sz(msg
) / ITEM_SIZE
;
275 write_lock_bh(&tipc_nametbl_lock
);
277 if (msg_type(msg
) == PUBLICATION
) {
278 publ
= tipc_nametbl_insert_publ(ntohl(item
->type
),
286 tipc_nodesub_subscribe(&publ
->subscr
,
292 } else if (msg_type(msg
) == WITHDRAWAL
) {
293 publ
= tipc_nametbl_remove_publ(ntohl(item
->type
),
300 tipc_nodesub_unsubscribe(&publ
->subscr
);
303 pr_err("Unable to remove publication by node 0x%x\n"
304 " (type=%u, lower=%u, ref=%u, key=%u)\n",
305 msg_orignode(msg
), ntohl(item
->type
),
306 ntohl(item
->lower
), ntohl(item
->ref
),
310 pr_warn("Unrecognized name table message received\n");
314 write_unlock_bh(&tipc_nametbl_lock
);
319 * tipc_named_reinit - re-initialize local publications
321 * This routine is called whenever TIPC networking is enabled.
322 * All name table entries published by this node are updated to reflect
323 * the node's new network address.
325 void tipc_named_reinit(void)
327 struct publication
*publ
;
330 write_lock_bh(&tipc_nametbl_lock
);
332 for (scope
= TIPC_ZONE_SCOPE
; scope
<= TIPC_NODE_SCOPE
; scope
++)
333 list_for_each_entry(publ
, &publ_lists
[scope
]->list
, local_list
)
334 publ
->node
= tipc_own_addr
;
336 write_unlock_bh(&tipc_nametbl_lock
);
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