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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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.
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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 sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size);
79 tipc_msg_init(net, msg, NAME_DISTRIBUTOR, type, INT_H_SIZE,
81 msg_set_size(msg, INT_H_SIZE + size);
86 void named_cluster_distribute(struct net *net, struct sk_buff *skb)
88 struct tipc_net *tn = net_generic(net, tipc_net_id);
90 struct tipc_node *node;
94 list_for_each_entry_rcu(node, &tn->node_list, list) {
96 if (in_own_node(net, dnode))
98 if (!tipc_node_active_links(node))
100 oskb = skb_copy(skb, GFP_ATOMIC);
103 msg_set_destnode(buf_msg(oskb), dnode);
104 tipc_link_xmit_skb(net, oskb, dnode, dnode);
112 * tipc_named_publish - tell other nodes about a new publication by this node
114 struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
116 struct tipc_net *tn = net_generic(net, tipc_net_id);
118 struct distr_item *item;
120 list_add_tail_rcu(&publ->local_list,
121 &tn->nametbl->publ_list[publ->scope]);
123 if (publ->scope == TIPC_NODE_SCOPE)
126 buf = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
128 pr_warn("Publication distribution failure\n");
132 item = (struct distr_item *)msg_data(buf_msg(buf));
133 publ_to_item(item, publ);
138 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
140 struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
143 struct distr_item *item;
145 list_del(&publ->local_list);
147 if (publ->scope == TIPC_NODE_SCOPE)
150 buf = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0);
152 pr_warn("Withdrawal distribution failure\n");
156 item = (struct distr_item *)msg_data(buf_msg(buf));
157 publ_to_item(item, publ);
162 * named_distribute - prepare name info for bulk distribution to another node
163 * @list: list of messages (buffers) to be returned from this function
164 * @dnode: node to be updated
165 * @pls: linked list of publication items to be packed into buffer chain
167 static void named_distribute(struct net *net, struct sk_buff_head *list,
168 u32 dnode, struct list_head *pls)
170 struct publication *publ;
171 struct sk_buff *skb = NULL;
172 struct distr_item *item = NULL;
173 uint msg_dsz = (tipc_node_get_mtu(net, dnode, 0) / ITEM_SIZE) *
175 uint msg_rem = msg_dsz;
177 list_for_each_entry(publ, pls, local_list) {
178 /* Prepare next buffer: */
180 skb = named_prepare_buf(net, PUBLICATION, msg_rem,
183 pr_warn("Bulk publication failure\n");
186 item = (struct distr_item *)msg_data(buf_msg(skb));
189 /* Pack publication into message: */
190 publ_to_item(item, publ);
192 msg_rem -= ITEM_SIZE;
194 /* Append full buffer to list: */
196 __skb_queue_tail(list, skb);
202 msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem));
203 skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
204 __skb_queue_tail(list, skb);
209 * tipc_named_node_up - tell specified node about all publications by this node
211 void tipc_named_node_up(struct net *net, u32 dnode)
213 struct tipc_net *tn = net_generic(net, tipc_net_id);
214 struct sk_buff_head head;
216 __skb_queue_head_init(&head);
219 named_distribute(net, &head, dnode,
220 &tn->nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
221 named_distribute(net, &head, dnode,
222 &tn->nametbl->publ_list[TIPC_ZONE_SCOPE]);
225 tipc_link_xmit(net, &head, dnode, dnode);
228 static void tipc_publ_subscribe(struct net *net, struct publication *publ,
231 struct tipc_node *node;
233 if (in_own_node(net, addr))
236 node = tipc_node_find(net, addr);
238 pr_warn("Node subscription rejected, unknown node 0x%x\n",
243 tipc_node_lock(node);
244 list_add_tail(&publ->nodesub_list, &node->publ_list);
245 tipc_node_unlock(node);
248 static void tipc_publ_unsubscribe(struct net *net, struct publication *publ,
251 struct tipc_node *node;
253 node = tipc_node_find(net, addr);
257 tipc_node_lock(node);
258 list_del_init(&publ->nodesub_list);
259 tipc_node_unlock(node);
263 * tipc_publ_purge - remove publication associated with a failed node
265 * Invoked for each publication issued by a newly failed node.
266 * Removes publication structure from name table & deletes it.
268 static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr)
270 struct tipc_net *tn = net_generic(net, tipc_net_id);
271 struct publication *p;
273 spin_lock_bh(&tn->nametbl_lock);
274 p = tipc_nametbl_remove_publ(net, publ->type, publ->lower,
275 publ->node, publ->ref, publ->key);
277 tipc_publ_unsubscribe(net, p, addr);
278 spin_unlock_bh(&tn->nametbl_lock);
281 pr_err("Unable to remove publication from failed node\n"
282 " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
283 publ->type, publ->lower, publ->node, publ->ref,
290 void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr)
292 struct publication *publ, *tmp;
294 list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list)
295 tipc_publ_purge(net, publ, addr);
299 * tipc_update_nametbl - try to process a nametable update and notify
302 * tipc_nametbl_lock must be held.
303 * Returns the publication item if successful, otherwise NULL.
305 static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
308 struct publication *publ = NULL;
310 if (dtype == PUBLICATION) {
311 publ = tipc_nametbl_insert_publ(net, ntohl(i->type),
314 TIPC_CLUSTER_SCOPE, node,
315 ntohl(i->ref), ntohl(i->key));
317 tipc_publ_subscribe(net, publ, node);
320 } else if (dtype == WITHDRAWAL) {
321 publ = tipc_nametbl_remove_publ(net, ntohl(i->type),
326 tipc_publ_unsubscribe(net, publ, node);
327 kfree_rcu(publ, rcu);
331 pr_warn("Unrecognized name table message received\n");
337 * tipc_named_add_backlog - add a failed name table update to the backlog
340 static void tipc_named_add_backlog(struct distr_item *i, u32 type, u32 node)
342 struct distr_queue_item *e;
343 unsigned long now = get_jiffies_64();
345 e = kzalloc(sizeof(*e), GFP_ATOMIC);
350 e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout);
351 memcpy(e, i, sizeof(*i));
352 list_add_tail(&e->next, &tipc_dist_queue);
356 * tipc_named_process_backlog - try to process any pending name table updates
359 void tipc_named_process_backlog(struct net *net)
361 struct distr_queue_item *e, *tmp;
363 unsigned long now = get_jiffies_64();
365 list_for_each_entry_safe(e, tmp, &tipc_dist_queue, next) {
366 if (time_after(e->expires, now)) {
367 if (!tipc_update_nametbl(net, &e->i, e->node, e->dtype))
370 tipc_addr_string_fill(addr, e->node);
371 pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n",
372 e->dtype, ntohl(e->i.type),
375 addr, ntohl(e->i.key));
383 * tipc_named_rcv - process name table update message sent by another node
385 void tipc_named_rcv(struct net *net, struct sk_buff *buf)
387 struct tipc_net *tn = net_generic(net, tipc_net_id);
388 struct tipc_msg *msg = buf_msg(buf);
389 struct distr_item *item = (struct distr_item *)msg_data(msg);
390 u32 count = msg_data_sz(msg) / ITEM_SIZE;
391 u32 node = msg_orignode(msg);
393 spin_lock_bh(&tn->nametbl_lock);
395 if (!tipc_update_nametbl(net, item, node, msg_type(msg)))
396 tipc_named_add_backlog(item, msg_type(msg), node);
399 tipc_named_process_backlog(net);
400 spin_unlock_bh(&tn->nametbl_lock);
405 * tipc_named_reinit - re-initialize local publications
407 * This routine is called whenever TIPC networking is enabled.
408 * All name table entries published by this node are updated to reflect
409 * the node's new network address.
411 void tipc_named_reinit(struct net *net)
413 struct tipc_net *tn = net_generic(net, tipc_net_id);
414 struct publication *publ;
417 spin_lock_bh(&tn->nametbl_lock);
419 for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
420 list_for_each_entry_rcu(publ, &tn->nametbl->publ_list[scope],
422 publ->node = tn->own_addr;
424 spin_unlock_bh(&tn->nametbl_lock);