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
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9 * modification, are permitted provided that the following conditions are met:
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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"
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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(struct net *net, u32 type, u32 size,
74 struct tipc_net *tn = net_generic(net, tipc_net_id);
75 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size);
80 tipc_msg_init(tn->own_addr, msg, NAME_DISTRIBUTOR, type,
82 msg_set_size(msg, INT_H_SIZE + size);
87 void named_cluster_distribute(struct net *net, struct sk_buff *skb)
89 struct tipc_net *tn = net_generic(net, tipc_net_id);
91 struct tipc_node *node;
95 list_for_each_entry_rcu(node, &tn->node_list, list) {
97 if (in_own_node(net, dnode))
99 if (!tipc_node_active_links(node))
101 oskb = skb_copy(skb, GFP_ATOMIC);
104 msg_set_destnode(buf_msg(oskb), dnode);
105 tipc_link_xmit_skb(net, oskb, dnode, dnode);
113 * tipc_named_publish - tell other nodes about a new publication by this node
115 struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
117 struct tipc_net *tn = net_generic(net, tipc_net_id);
119 struct distr_item *item;
121 list_add_tail_rcu(&publ->local_list,
122 &tn->nametbl->publ_list[publ->scope]);
124 if (publ->scope == TIPC_NODE_SCOPE)
127 buf = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
129 pr_warn("Publication distribution failure\n");
133 item = (struct distr_item *)msg_data(buf_msg(buf));
134 publ_to_item(item, publ);
139 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
141 struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
144 struct distr_item *item;
146 list_del(&publ->local_list);
148 if (publ->scope == TIPC_NODE_SCOPE)
151 buf = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0);
153 pr_warn("Withdrawal distribution failure\n");
157 item = (struct distr_item *)msg_data(buf_msg(buf));
158 publ_to_item(item, publ);
163 * named_distribute - prepare name info for bulk distribution to another node
164 * @list: list of messages (buffers) to be returned from this function
165 * @dnode: node to be updated
166 * @pls: linked list of publication items to be packed into buffer chain
168 static void named_distribute(struct net *net, struct sk_buff_head *list,
169 u32 dnode, struct list_head *pls)
171 struct publication *publ;
172 struct sk_buff *skb = NULL;
173 struct distr_item *item = NULL;
174 uint msg_dsz = (tipc_node_get_mtu(net, dnode, 0) / ITEM_SIZE) *
176 uint msg_rem = msg_dsz;
178 list_for_each_entry(publ, pls, local_list) {
179 /* Prepare next buffer: */
181 skb = named_prepare_buf(net, PUBLICATION, msg_rem,
184 pr_warn("Bulk publication failure\n");
187 item = (struct distr_item *)msg_data(buf_msg(skb));
190 /* Pack publication into message: */
191 publ_to_item(item, publ);
193 msg_rem -= ITEM_SIZE;
195 /* Append full buffer to list: */
197 __skb_queue_tail(list, skb);
203 msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem));
204 skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
205 __skb_queue_tail(list, skb);
210 * tipc_named_node_up - tell specified node about all publications by this node
212 void tipc_named_node_up(struct net *net, u32 dnode)
214 struct tipc_net *tn = net_generic(net, tipc_net_id);
215 struct sk_buff_head head;
217 __skb_queue_head_init(&head);
220 named_distribute(net, &head, dnode,
221 &tn->nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
222 named_distribute(net, &head, dnode,
223 &tn->nametbl->publ_list[TIPC_ZONE_SCOPE]);
226 tipc_link_xmit(net, &head, dnode, dnode);
229 static void tipc_publ_subscribe(struct net *net, struct publication *publ,
232 struct tipc_node *node;
234 if (in_own_node(net, addr))
237 node = tipc_node_find(net, addr);
239 pr_warn("Node subscription rejected, unknown node 0x%x\n",
244 tipc_node_lock(node);
245 list_add_tail(&publ->nodesub_list, &node->publ_list);
246 tipc_node_unlock(node);
249 static void tipc_publ_unsubscribe(struct net *net, struct publication *publ,
252 struct tipc_node *node;
254 node = tipc_node_find(net, addr);
258 tipc_node_lock(node);
259 list_del_init(&publ->nodesub_list);
260 tipc_node_unlock(node);
264 * tipc_publ_purge - remove publication associated with a failed node
266 * Invoked for each publication issued by a newly failed node.
267 * Removes publication structure from name table & deletes it.
269 static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr)
271 struct tipc_net *tn = net_generic(net, tipc_net_id);
272 struct publication *p;
274 spin_lock_bh(&tn->nametbl_lock);
275 p = tipc_nametbl_remove_publ(net, publ->type, publ->lower,
276 publ->node, publ->ref, publ->key);
278 tipc_publ_unsubscribe(net, p, addr);
279 spin_unlock_bh(&tn->nametbl_lock);
282 pr_err("Unable to remove publication from failed node\n"
283 " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
284 publ->type, publ->lower, publ->node, publ->ref,
291 void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr)
293 struct publication *publ, *tmp;
295 list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list)
296 tipc_publ_purge(net, publ, addr);
300 * tipc_update_nametbl - try to process a nametable update and notify
303 * tipc_nametbl_lock must be held.
304 * Returns the publication item if successful, otherwise NULL.
306 static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
309 struct publication *publ = NULL;
311 if (dtype == PUBLICATION) {
312 publ = tipc_nametbl_insert_publ(net, ntohl(i->type),
315 TIPC_CLUSTER_SCOPE, node,
316 ntohl(i->ref), ntohl(i->key));
318 tipc_publ_subscribe(net, publ, node);
321 } else if (dtype == WITHDRAWAL) {
322 publ = tipc_nametbl_remove_publ(net, ntohl(i->type),
327 tipc_publ_unsubscribe(net, publ, node);
328 kfree_rcu(publ, rcu);
332 pr_warn("Unrecognized name table message received\n");
338 * tipc_named_add_backlog - add a failed name table update to the backlog
341 static void tipc_named_add_backlog(struct distr_item *i, u32 type, u32 node)
343 struct distr_queue_item *e;
344 unsigned long now = get_jiffies_64();
346 e = kzalloc(sizeof(*e), GFP_ATOMIC);
351 e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout);
352 memcpy(e, i, sizeof(*i));
353 list_add_tail(&e->next, &tipc_dist_queue);
357 * tipc_named_process_backlog - try to process any pending name table updates
360 void tipc_named_process_backlog(struct net *net)
362 struct distr_queue_item *e, *tmp;
364 unsigned long now = get_jiffies_64();
366 list_for_each_entry_safe(e, tmp, &tipc_dist_queue, next) {
367 if (time_after(e->expires, now)) {
368 if (!tipc_update_nametbl(net, &e->i, e->node, e->dtype))
371 tipc_addr_string_fill(addr, e->node);
372 pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n",
373 e->dtype, ntohl(e->i.type),
376 addr, ntohl(e->i.key));
384 * tipc_named_rcv - process name table update messages sent by another node
386 void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq)
388 struct tipc_net *tn = net_generic(net, tipc_net_id);
389 struct tipc_msg *msg;
390 struct distr_item *item;
396 spin_lock_bh(&tn->nametbl_lock);
397 for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) {
399 mtype = msg_type(msg);
400 item = (struct distr_item *)msg_data(msg);
401 count = msg_data_sz(msg) / ITEM_SIZE;
402 node = msg_orignode(msg);
404 if (!tipc_update_nametbl(net, item, node, mtype))
405 tipc_named_add_backlog(item, mtype, node);
409 tipc_named_process_backlog(net);
411 spin_unlock_bh(&tn->nametbl_lock);
415 * tipc_named_reinit - re-initialize local publications
417 * This routine is called whenever TIPC networking is enabled.
418 * All name table entries published by this node are updated to reflect
419 * the node's new network address.
421 void tipc_named_reinit(struct net *net)
423 struct tipc_net *tn = net_generic(net, tipc_net_id);
424 struct publication *publ;
427 spin_lock_bh(&tn->nametbl_lock);
429 for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
430 list_for_each_entry_rcu(publ, &tn->nametbl->publ_list[scope],
432 publ->node = tn->own_addr;
434 spin_unlock_bh(&tn->nametbl_lock);