1 files changed, 325 insertions, 0 deletions

diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c
new file mode 100644
index 00000000000..8ce730984aa
--- /dev/null
+++ b/net/tipc/name_distr.c
@@ -0,0 +1,325 @@
+/*
+ * net/tipc/name_distr.c: TIPC name distribution code
+ *
+ * Copyright (c) 2000-2006, Ericsson AB
+ * Copyright (c) 2005, 2010-2011, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "link.h"
+#include "name_distr.h"
+
+/**
+ * struct publ_list - list of publications made by this node
+ * @list: circular list of publications
+ * @list_size: number of entries in list
+ */
+struct publ_list {
+	struct list_head list;
+	u32 size;
+};
+
+static struct publ_list publ_zone = {
+	.list = LIST_HEAD_INIT(publ_zone.list),
+	.size = 0,
+};
+
+static struct publ_list publ_cluster = {
+	.list = LIST_HEAD_INIT(publ_cluster.list),
+	.size = 0,
+};
+
+static struct publ_list publ_node = {
+	.list = LIST_HEAD_INIT(publ_node.list),
+	.size = 0,
+};
+
+static struct publ_list *publ_lists[] = {
+	NULL,
+	&publ_zone,	/* publ_lists[TIPC_ZONE_SCOPE]		*/
+	&publ_cluster,	/* publ_lists[TIPC_CLUSTER_SCOPE]	*/
+	&publ_node	/* publ_lists[TIPC_NODE_SCOPE]		*/
+};
+
+
+/**
+ * publ_to_item - add publication info to a publication message
+ */
+static void publ_to_item(struct distr_item *i, struct publication *p)
+{
+	i->type = htonl(p->type);
+	i->lower = htonl(p->lower);
+	i->upper = htonl(p->upper);
+	i->ref = htonl(p->ref);
+	i->key = htonl(p->key);
+}
+
+/**
+ * named_prepare_buf - allocate & initialize a publication message
+ */
+static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest)
+{
+	struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size);
+	struct tipc_msg *msg;
+
+	if (buf != NULL) {
+		msg = buf_msg(buf);
+		tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest);
+		msg_set_size(msg, INT_H_SIZE + size);
+	}
+	return buf;
+}
+
+void named_cluster_distribute(struct sk_buff *buf)
+{
+	struct sk_buff *buf_copy;
+	struct tipc_node *n_ptr;
+	struct tipc_link *l_ptr;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
+		tipc_node_lock(n_ptr);
+		l_ptr = n_ptr->active_links[n_ptr->addr & 1];
+		if (l_ptr) {
+			buf_copy = skb_copy(buf, GFP_ATOMIC);
+			if (!buf_copy) {
+				tipc_node_unlock(n_ptr);
+				break;
+			}
+			msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
+			__tipc_link_xmit(l_ptr, buf_copy);
+		}
+		tipc_node_unlock(n_ptr);
+	}
+	rcu_read_unlock();
+
+	kfree_skb(buf);
+}
+
+/**
+ * tipc_named_publish - tell other nodes about a new publication by this node
+ */
+struct sk_buff *tipc_named_publish(struct publication *publ)
+{
+	struct sk_buff *buf;
+	struct distr_item *item;
+
+	list_add_tail(&publ->local_list, &publ_lists[publ->scope]->list);
+	publ_lists[publ->scope]->size++;
+
+	if (publ->scope == TIPC_NODE_SCOPE)
+		return NULL;
+
+	buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0);
+	if (!buf) {
+		pr_warn("Publication distribution failure\n");
+		return NULL;
+	}
+
+	item = (struct distr_item *)msg_data(buf_msg(buf));
+	publ_to_item(item, publ);
+	return buf;
+}
+
+/**
+ * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
+ */
+struct sk_buff *tipc_named_withdraw(struct publication *publ)
+{
+	struct sk_buff *buf;
+	struct distr_item *item;
+
+	list_del(&publ->local_list);
+	publ_lists[publ->scope]->size--;
+
+	if (publ->scope == TIPC_NODE_SCOPE)
+		return NULL;
+
+	buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0);
+	if (!buf) {
+		pr_warn("Withdrawal distribution failure\n");
+		return NULL;
+	}
+
+	item = (struct distr_item *)msg_data(buf_msg(buf));
+	publ_to_item(item, publ);
+	return buf;
+}
+
+/*
+ * named_distribute - prepare name info for bulk distribution to another node
+ */
+static void named_distribute(struct list_head *message_list, u32 node,
+			     struct publ_list *pls, u32 max_item_buf)
+{
+	struct publication *publ;
+	struct sk_buff *buf = NULL;
+	struct distr_item *item = NULL;
+	u32 left = 0;
+	u32 rest = pls->size * ITEM_SIZE;
+
+	list_for_each_entry(publ, &pls->list, local_list) {
+		if (!buf) {
+			left = (rest <= max_item_buf) ? rest : max_item_buf;
+			rest -= left;
+			buf = named_prepare_buf(PUBLICATION, left, node);
+			if (!buf) {
+				pr_warn("Bulk publication failure\n");
+				return;
+			}
+			item = (struct distr_item *)msg_data(buf_msg(buf));
+		}
+		publ_to_item(item, publ);
+		item++;
+		left -= ITEM_SIZE;
+		if (!left) {
+			list_add_tail((struct list_head *)buf, message_list);
+			buf = NULL;
+		}
+	}
+}
+
+/**
+ * tipc_named_node_up - tell specified node about all publications by this node
+ */
+void tipc_named_node_up(u32 max_item_buf, u32 node)
+{
+	LIST_HEAD(message_list);
+
+	read_lock_bh(&tipc_nametbl_lock);
+	named_distribute(&message_list, node, &publ_cluster, max_item_buf);
+	named_distribute(&message_list, node, &publ_zone, max_item_buf);
+	read_unlock_bh(&tipc_nametbl_lock);
+
+	tipc_link_names_xmit(&message_list, node);
+}
+
+/**
+ * named_purge_publ - remove publication associated with a failed node
+ *
+ * Invoked for each publication issued by a newly failed node.
+ * Removes publication structure from name table & deletes it.
+ */
+static void named_purge_publ(struct publication *publ)
+{
+	struct publication *p;
+
+	write_lock_bh(&tipc_nametbl_lock);
+	p = tipc_nametbl_remove_publ(publ->type, publ->lower,
+				     publ->node, publ->ref, publ->key);
+	if (p)
+		tipc_nodesub_unsubscribe(&p->subscr);
+	write_unlock_bh(&tipc_nametbl_lock);
+
+	if (p != publ) {
+		pr_err("Unable to remove publication from failed node\n"
+		       " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
+		       publ->type, publ->lower, publ->node, publ->ref,
+		       publ->key);
+	}
+
+	kfree(p);
+}
+
+/**
+ * tipc_named_rcv - process name table update message sent by another node
+ */
+void tipc_named_rcv(struct sk_buff *buf)
+{
+	struct publication *publ;
+	struct tipc_msg *msg = buf_msg(buf);
+	struct distr_item *item = (struct distr_item *)msg_data(msg);
+	u32 count = msg_data_sz(msg) / ITEM_SIZE;
+
+	write_lock_bh(&tipc_nametbl_lock);
+	while (count--) {
+		if (msg_type(msg) == PUBLICATION) {
+			publ = tipc_nametbl_insert_publ(ntohl(item->type),
+							ntohl(item->lower),
+							ntohl(item->upper),
+							TIPC_CLUSTER_SCOPE,
+							msg_orignode(msg),
+							ntohl(item->ref),
+							ntohl(item->key));
+			if (publ) {
+				tipc_nodesub_subscribe(&publ->subscr,
+						       msg_orignode(msg),
+						       publ,
+						       (net_ev_handler)
+						       named_purge_publ);
+			}
+		} else if (msg_type(msg) == WITHDRAWAL) {
+			publ = tipc_nametbl_remove_publ(ntohl(item->type),
+							ntohl(item->lower),
+							msg_orignode(msg),
+							ntohl(item->ref),
+							ntohl(item->key));
+
+			if (publ) {
+				tipc_nodesub_unsubscribe(&publ->subscr);
+				kfree(publ);
+			} else {
+				pr_err("Unable to remove publication by node 0x%x\n"
+				       " (type=%u, lower=%u, ref=%u, key=%u)\n",
+				       msg_orignode(msg), ntohl(item->type),
+				       ntohl(item->lower), ntohl(item->ref),
+				       ntohl(item->key));
+			}
+		} else {
+			pr_warn("Unrecognized name table message received\n");
+		}
+		item++;
+	}
+	write_unlock_bh(&tipc_nametbl_lock);
+	kfree_skb(buf);
+}
+
+/**
+ * tipc_named_reinit - re-initialize local publications
+ *
+ * This routine is called whenever TIPC networking is enabled.
+ * All name table entries published by this node are updated to reflect
+ * the node's new network address.
+ */
+void tipc_named_reinit(void)
+{
+	struct publication *publ;
+	int scope;
+
+	write_lock_bh(&tipc_nametbl_lock);
+
+	for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
+		list_for_each_entry(publ, &publ_lists[scope]->list, local_list)
+			publ->node = tipc_own_addr;
+
+	write_unlock_bh(&tipc_nametbl_lock);
+}