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(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);