2 * net/tipc/name_distr.c: TIPC name distribution code
4 * Copyright (c) 2000-2006, 2014, 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"
41 int sysctl_tipc_named_timeout __read_mostly
= 2000;
44 * struct tipc_dist_queue - queue holding deferred name table updates
46 static struct list_head tipc_dist_queue
= LIST_HEAD_INIT(tipc_dist_queue
);
48 struct distr_queue_item
{
52 unsigned long expires
;
53 struct list_head next
;
57 * publ_to_item - add publication info to a publication message
59 static void publ_to_item(struct distr_item
*i
, struct publication
*p
)
61 i
->type
= htonl(p
->type
);
62 i
->lower
= htonl(p
->lower
);
63 i
->upper
= htonl(p
->upper
);
64 i
->ref
= htonl(p
->ref
);
65 i
->key
= htonl(p
->key
);
69 * named_prepare_buf - allocate & initialize a publication message
71 static struct sk_buff
*named_prepare_buf(u32 type
, u32 size
, u32 dest
)
73 struct sk_buff
*buf
= tipc_buf_acquire(INT_H_SIZE
+ size
);
78 tipc_msg_init(msg
, NAME_DISTRIBUTOR
, type
, INT_H_SIZE
, dest
);
79 msg_set_size(msg
, INT_H_SIZE
+ size
);
84 void named_cluster_distribute(struct sk_buff
*skb
)
87 struct tipc_node
*node
;
91 list_for_each_entry_rcu(node
, &tipc_node_list
, list
) {
93 if (in_own_node(dnode
))
95 if (!tipc_node_active_links(node
))
97 oskb
= skb_copy(skb
, GFP_ATOMIC
);
100 msg_set_destnode(buf_msg(oskb
), dnode
);
101 tipc_link_xmit_skb(oskb
, dnode
, dnode
);
109 * tipc_named_publish - tell other nodes about a new publication by this node
111 struct sk_buff
*tipc_named_publish(struct publication
*publ
)
114 struct distr_item
*item
;
116 list_add_tail_rcu(&publ
->local_list
,
117 &tipc_nametbl
->publ_list
[publ
->scope
]);
119 if (publ
->scope
== TIPC_NODE_SCOPE
)
122 buf
= named_prepare_buf(PUBLICATION
, ITEM_SIZE
, 0);
124 pr_warn("Publication distribution failure\n");
128 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
129 publ_to_item(item
, publ
);
134 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
136 struct sk_buff
*tipc_named_withdraw(struct publication
*publ
)
139 struct distr_item
*item
;
141 list_del(&publ
->local_list
);
143 if (publ
->scope
== TIPC_NODE_SCOPE
)
146 buf
= named_prepare_buf(WITHDRAWAL
, ITEM_SIZE
, 0);
148 pr_warn("Withdrawal distribution failure\n");
152 item
= (struct distr_item
*)msg_data(buf_msg(buf
));
153 publ_to_item(item
, publ
);
158 * named_distribute - prepare name info for bulk distribution to another node
159 * @list: list of messages (buffers) to be returned from this function
160 * @dnode: node to be updated
161 * @pls: linked list of publication items to be packed into buffer chain
163 static void named_distribute(struct sk_buff_head
*list
, u32 dnode
,
164 struct list_head
*pls
)
166 struct publication
*publ
;
167 struct sk_buff
*skb
= NULL
;
168 struct distr_item
*item
= NULL
;
169 uint msg_dsz
= (tipc_node_get_mtu(dnode
, 0) / ITEM_SIZE
) * ITEM_SIZE
;
170 uint msg_rem
= msg_dsz
;
172 list_for_each_entry(publ
, pls
, local_list
) {
173 /* Prepare next buffer: */
175 skb
= named_prepare_buf(PUBLICATION
, msg_rem
, dnode
);
177 pr_warn("Bulk publication failure\n");
180 item
= (struct distr_item
*)msg_data(buf_msg(skb
));
183 /* Pack publication into message: */
184 publ_to_item(item
, publ
);
186 msg_rem
-= ITEM_SIZE
;
188 /* Append full buffer to list: */
190 __skb_queue_tail(list
, skb
);
196 msg_set_size(buf_msg(skb
), INT_H_SIZE
+ (msg_dsz
- msg_rem
));
197 skb_trim(skb
, INT_H_SIZE
+ (msg_dsz
- msg_rem
));
198 __skb_queue_tail(list
, skb
);
203 * tipc_named_node_up - tell specified node about all publications by this node
205 void tipc_named_node_up(u32 dnode
)
207 struct sk_buff_head head
;
209 __skb_queue_head_init(&head
);
212 named_distribute(&head
, dnode
,
213 &tipc_nametbl
->publ_list
[TIPC_CLUSTER_SCOPE
]);
214 named_distribute(&head
, dnode
,
215 &tipc_nametbl
->publ_list
[TIPC_ZONE_SCOPE
]);
218 tipc_link_xmit(&head
, dnode
, dnode
);
221 static void tipc_publ_subscribe(struct publication
*publ
, u32 addr
)
223 struct tipc_node
*node
;
225 if (in_own_node(addr
))
228 node
= tipc_node_find(addr
);
230 pr_warn("Node subscription rejected, unknown node 0x%x\n",
235 tipc_node_lock(node
);
236 list_add_tail(&publ
->nodesub_list
, &node
->publ_list
);
237 tipc_node_unlock(node
);
240 static void tipc_publ_unsubscribe(struct publication
*publ
, u32 addr
)
242 struct tipc_node
*node
;
244 node
= tipc_node_find(addr
);
248 tipc_node_lock(node
);
249 list_del_init(&publ
->nodesub_list
);
250 tipc_node_unlock(node
);
254 * tipc_publ_purge - remove publication associated with a failed node
256 * Invoked for each publication issued by a newly failed node.
257 * Removes publication structure from name table & deletes it.
259 static void tipc_publ_purge(struct publication
*publ
, u32 addr
)
261 struct publication
*p
;
263 spin_lock_bh(&tipc_nametbl_lock
);
264 p
= tipc_nametbl_remove_publ(publ
->type
, publ
->lower
,
265 publ
->node
, publ
->ref
, publ
->key
);
267 tipc_publ_unsubscribe(p
, addr
);
268 spin_unlock_bh(&tipc_nametbl_lock
);
271 pr_err("Unable to remove publication from failed node\n"
272 " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
273 publ
->type
, publ
->lower
, publ
->node
, publ
->ref
,
280 void tipc_publ_notify(struct list_head
*nsub_list
, u32 addr
)
282 struct publication
*publ
, *tmp
;
284 list_for_each_entry_safe(publ
, tmp
, nsub_list
, nodesub_list
)
285 tipc_publ_purge(publ
, addr
);
289 * tipc_update_nametbl - try to process a nametable update and notify
292 * tipc_nametbl_lock must be held.
293 * Returns the publication item if successful, otherwise NULL.
295 static bool tipc_update_nametbl(struct distr_item
*i
, u32 node
, u32 dtype
)
297 struct publication
*publ
= NULL
;
299 if (dtype
== PUBLICATION
) {
300 publ
= tipc_nametbl_insert_publ(ntohl(i
->type
), ntohl(i
->lower
),
302 TIPC_CLUSTER_SCOPE
, node
,
303 ntohl(i
->ref
), ntohl(i
->key
));
305 tipc_publ_subscribe(publ
, node
);
308 } else if (dtype
== WITHDRAWAL
) {
309 publ
= tipc_nametbl_remove_publ(ntohl(i
->type
), ntohl(i
->lower
),
313 tipc_publ_unsubscribe(publ
, node
);
314 kfree_rcu(publ
, rcu
);
318 pr_warn("Unrecognized name table message received\n");
324 * tipc_named_add_backlog - add a failed name table update to the backlog
327 static void tipc_named_add_backlog(struct distr_item
*i
, u32 type
, u32 node
)
329 struct distr_queue_item
*e
;
330 unsigned long now
= get_jiffies_64();
332 e
= kzalloc(sizeof(*e
), GFP_ATOMIC
);
337 e
->expires
= now
+ msecs_to_jiffies(sysctl_tipc_named_timeout
);
338 memcpy(e
, i
, sizeof(*i
));
339 list_add_tail(&e
->next
, &tipc_dist_queue
);
343 * tipc_named_process_backlog - try to process any pending name table updates
346 void tipc_named_process_backlog(void)
348 struct distr_queue_item
*e
, *tmp
;
350 unsigned long now
= get_jiffies_64();
352 list_for_each_entry_safe(e
, tmp
, &tipc_dist_queue
, next
) {
353 if (time_after(e
->expires
, now
)) {
354 if (!tipc_update_nametbl(&e
->i
, e
->node
, e
->dtype
))
357 tipc_addr_string_fill(addr
, e
->node
);
358 pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n",
359 e
->dtype
, ntohl(e
->i
.type
),
362 addr
, ntohl(e
->i
.key
));
370 * tipc_named_rcv - process name table update message sent by another node
372 void tipc_named_rcv(struct sk_buff
*buf
)
374 struct tipc_msg
*msg
= buf_msg(buf
);
375 struct distr_item
*item
= (struct distr_item
*)msg_data(msg
);
376 u32 count
= msg_data_sz(msg
) / ITEM_SIZE
;
377 u32 node
= msg_orignode(msg
);
379 spin_lock_bh(&tipc_nametbl_lock
);
381 if (!tipc_update_nametbl(item
, node
, msg_type(msg
)))
382 tipc_named_add_backlog(item
, msg_type(msg
), node
);
385 tipc_named_process_backlog();
386 spin_unlock_bh(&tipc_nametbl_lock
);
391 * tipc_named_reinit - re-initialize local publications
393 * This routine is called whenever TIPC networking is enabled.
394 * All name table entries published by this node are updated to reflect
395 * the node's new network address.
397 void tipc_named_reinit(void)
399 struct publication
*publ
;
402 spin_lock_bh(&tipc_nametbl_lock
);
404 for (scope
= TIPC_ZONE_SCOPE
; scope
<= TIPC_NODE_SCOPE
; scope
++)
405 list_for_each_entry_rcu(publ
, &tipc_nametbl
->publ_list
[scope
],
407 publ
->node
= tipc_own_addr
;
409 spin_unlock_bh(&tipc_nametbl_lock
);