Release 4.17 net/tipc/name_distr.c

/*
 * net/tipc/name_distr.c: TIPC name distribution code
 *
 * Copyright (c) 2000-2006, 2014, 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"


int sysctl_tipc_named_timeout __read_mostly = 2000;


struct distr_queue_item {
	
struct distr_item i;
	
u32 dtype;
	
u32 node;
	
unsigned long expires;
	
struct list_head next;
};

/**
 * 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->port = htonl(p->port);
	i->key = htonl(p->key);
}

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Jon Paul Maloy
2
2.82%
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2
100.00%

/**
 * named_prepare_buf - allocate & initialize a publication message
 *
 * The buffer returned is of size INT_H_SIZE + payload size
 */


static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size,
					 u32 dest)
{
	struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC);
	u32 self = tipc_own_addr(net);
	struct tipc_msg *msg;

	if (buf != NULL) {
		msg = buf_msg(buf);
		tipc_msg_init(self, msg, NAME_DISTRIBUTOR,
			      type, INT_H_SIZE, dest);
		msg_set_size(msg, INT_H_SIZE + size);
	}
	return buf;
}

Contributors
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Per Liden
69
75.82%
1
14.29%
Jon Paul Maloy
9
9.89%
1
14.29%
Ying Xue
6
6.59%
1
14.29%
Allan Stephens
4
4.40%
2
28.57%
Parthasarathy Bhuvaragan
2
2.20%
1
14.29%
Stephen Hemminger
1
1.10%
1
14.29%
Total
91
100.00%
7
100.00%

/**
 * tipc_named_publish - tell other nodes about a new publication by this node
 */


struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
{
	struct name_table *nt = tipc_name_table(net);
	struct distr_item *item;
	struct sk_buff *skb;

	if (publ->scope == TIPC_NODE_SCOPE) {
		list_add_tail_rcu(&publ->binding_node, &nt->node_scope);
		return NULL;
	}
	list_add_tail_rcu(&publ->binding_node, &nt->cluster_scope);

	skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
	if (!skb) {
		pr_warn("Publication distribution failure\n");
		return NULL;
	}

	item = (struct distr_item *)msg_data(buf_msg(skb));
	publ_to_item(item, publ);
	return skb;
}

Contributors
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63
48.84%
2
18.18%
Jon Paul Maloy
37
28.68%
2
18.18%
Ying Xue
27
20.93%
5
45.45%
Allan Stephens
1
0.78%
1
9.09%
Erik Hugne
1
0.78%
1
9.09%
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129
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11
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/**
 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
 */


struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
{
	struct sk_buff *buf;
	struct distr_item *item;

	list_del(&publ->binding_node);

	if (publ->scope == TIPC_NODE_SCOPE)
		return NULL;

	buf = named_prepare_buf(net, 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;
}

Contributors
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Per Liden
70
70.71%
2
25.00%
Ying Xue
18
18.18%
2
25.00%
Allan Stephens
8
8.08%
1
12.50%
Erik Hugne
1
1.01%
1
12.50%
Jon Paul Maloy
1
1.01%
1
12.50%
Lucas De Marchi
1
1.01%
1
12.50%
Total
99
100.00%
8
100.00%

/**
 * named_distribute - prepare name info for bulk distribution to another node
 * @list: list of messages (buffers) to be returned from this function
 * @dnode: node to be updated
 * @pls: linked list of publication items to be packed into buffer chain
 */


static void named_distribute(struct net *net, struct sk_buff_head *list,
			     u32 dnode, struct list_head *pls)
{
	struct publication *publ;
	struct sk_buff *skb = NULL;
	struct distr_item *item = NULL;
	u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0) - INT_H_SIZE) /
			ITEM_SIZE) * ITEM_SIZE;
	u32 msg_rem = msg_dsz;

	list_for_each_entry(publ, pls, binding_node) {
		/* Prepare next buffer: */
		if (!skb) {
			skb = named_prepare_buf(net, PUBLICATION, msg_rem,
						dnode);
			if (!skb) {
				pr_warn("Bulk publication failure\n");
				return;
			}
			msg_set_bc_ack_invalid(buf_msg(skb), true);
			item = (struct distr_item *)msg_data(buf_msg(skb));
		}

		/* Pack publication into message: */
		publ_to_item(item, publ);
		item++;
		msg_rem -= ITEM_SIZE;

		/* Append full buffer to list: */
		if (!msg_rem) {
			__skb_queue_tail(list, skb);
			skb = NULL;
			msg_rem = msg_dsz;
		}
	}
	if (skb) {
		msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem));
		skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
		__skb_queue_tail(list, skb);
	}
}

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81
36.99%
1
5.88%
Ying Xue
69
31.51%
5
29.41%
Jon Paul Maloy
37
16.89%
3
17.65%
Allan Stephens
21
9.59%
4
23.53%
Parthasarathy Bhuvaragan
6
2.74%
1
5.88%
Sam Ravnborg
2
0.91%
1
5.88%
Paul Gortmaker
2
0.91%
1
5.88%
Erik Hugne
1
0.46%
1
5.88%
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219
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/**
 * tipc_named_node_up - tell specified node about all publications by this node
 */


void tipc_named_node_up(struct net *net, u32 dnode)
{
	struct name_table *nt = tipc_name_table(net);
	struct sk_buff_head head;

	__skb_queue_head_init(&head);

	rcu_read_lock();
	named_distribute(net, &head, dnode, &nt->cluster_scope);
	rcu_read_unlock();

	tipc_node_xmit(net, &head, dnode, 0);
}

Contributors
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Ying Xue
32
48.48%
5
38.46%
Allan Stephens
21
31.82%
3
23.08%
Jon Paul Maloy
11
16.67%
4
30.77%
Per Liden
2
3.03%
1
7.69%
Total
66
100.00%
13
100.00%

/**
 * tipc_publ_purge - 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 tipc_publ_purge(struct net *net, struct publication *publ, u32 addr)
{
	struct tipc_net *tn = tipc_net(net);
	struct publication *p;

	spin_lock_bh(&tn->nametbl_lock);
	p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper,
				     publ->node, publ->key);
	if (p)
		tipc_node_unsubscribe(net, &p->binding_node, addr);
	spin_unlock_bh(&tn->nametbl_lock);

	if (p != publ) {
		pr_err("Unable to remove publication from failed node\n"
		       " (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n",
		       publ->type, publ->lower, publ->node, publ->port,
		       publ->key);
	}

	kfree_rcu(p, rcu);
}

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Per Liden
50
37.31%
2
15.38%
Allan Stephens
39
29.10%
2
15.38%
Ying Xue
35
26.12%
4
30.77%
Jon Paul Maloy
9
6.72%
4
30.77%
Erik Hugne
1
0.75%
1
7.69%
Total
134
100.00%
13
100.00%

/**
 * tipc_dist_queue_purge - remove deferred updates from a node that went down
 */


static void tipc_dist_queue_purge(struct net *net, u32 addr)
{
	struct tipc_net *tn = net_generic(net, tipc_net_id);
	struct distr_queue_item *e, *tmp;

	spin_lock_bh(&tn->nametbl_lock);
	list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) {
		if (e->node != addr)
			continue;
		list_del(&e->next);
		kfree(e);
	}
	spin_unlock_bh(&tn->nametbl_lock);
}

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void tipc_publ_notify(struct net *net, struct list_head *nsub_list, u32 addr)
{
	struct publication *publ, *tmp;

	list_for_each_entry_safe(publ, tmp, nsub_list, binding_node)
		tipc_publ_purge(net, publ, addr);
	tipc_dist_queue_purge(net, addr);
}

Contributors
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Ying Xue
44
84.62%
2
50.00%
Erik Hugne
7
13.46%
1
25.00%
Jon Paul Maloy
1
1.92%
1
25.00%
Total
52
100.00%
4
100.00%

/**
 * tipc_update_nametbl - try to process a nametable update and notify
 *                       subscribers
 *
 * tipc_nametbl_lock must be held.
 * Returns the publication item if successful, otherwise NULL.
 */


static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
				u32 node, u32 dtype)
{
	struct publication *p = NULL;
	u32 lower = ntohl(i->lower);
	u32 upper = ntohl(i->upper);
	u32 type = ntohl(i->type);
	u32 port = ntohl(i->port);
	u32 key = ntohl(i->key);

	if (dtype == PUBLICATION) {
		p = tipc_nametbl_insert_publ(net, type, lower, upper,
					     TIPC_CLUSTER_SCOPE, node,
					     port, key);
		if (p) {
			tipc_node_subscribe(net, &p->binding_node, node);
			return true;
		}
	} else if (dtype == WITHDRAWAL) {
		p = tipc_nametbl_remove_publ(net, type, lower,
					     upper, node, key);
		if (p) {
			tipc_node_unsubscribe(net, &p->binding_node, node);
			kfree_rcu(p, rcu);
			return true;
		}
		pr_warn_ratelimited("Failed to remove binding %u,%u from %x\n",
				    type, lower, node);
	} else {
		pr_warn("Unrecognized name table message received\n");
	}
	return false;
}

Contributors
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CommitProp
Jon Paul Maloy
76
37.07%
5
35.71%
Per Liden
73
35.61%
2
14.29%
Erik Hugne
40
19.51%
3
21.43%
Ying Xue
16
7.80%
4
28.57%
Total
205
100.00%
14
100.00%

/**
 * tipc_named_rcv - process name table update messages sent by another node
 */


void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq)
{
	struct tipc_net *tn = net_generic(net, tipc_net_id);
	struct tipc_msg *msg;
	struct distr_item *item;
	uint count;
	u32 node;
	struct sk_buff *skb;
	int mtype;

	spin_lock_bh(&tn->nametbl_lock);
	for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) {
		skb_linearize(skb);
		msg = buf_msg(skb);
		mtype = msg_type(msg);
		item = (struct distr_item *)msg_data(msg);
		count = msg_data_sz(msg) / ITEM_SIZE;
		node = msg_orignode(msg);
		while (count--) {
			tipc_update_nametbl(net, item, node, mtype);
			item++;
		}
		kfree_skb(skb);
	}
	spin_unlock_bh(&tn->nametbl_lock);
}

Contributors
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CommitProp
Jon Paul Maloy
76
47.50%
2
22.22%
Erik Hugne
43
26.88%
2
22.22%
Ying Xue
23
14.38%
3
33.33%
Per Liden
10
6.25%
1
11.11%
Allan Stephens
8
5.00%
1
11.11%
Total
160
100.00%
9
100.00%

/**
 * 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(struct net *net)
{
	struct name_table *nt = tipc_name_table(net);
	struct tipc_net *tn = tipc_net(net);
	struct publication *publ;
	u32 self = tipc_own_addr(net);

	spin_lock_bh(&tn->nametbl_lock);

	list_for_each_entry_rcu(publ, &nt->node_scope, binding_node)
		publ->node = self;
	list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node)
		publ->node = self;

	spin_unlock_bh(&tn->nametbl_lock);
}
Contributors
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CommitProp
Jon Paul Maloy
35
40.23%
3
37.50%
Per Liden
29
33.33%
2
25.00%
Ying Xue
22
25.29%
2
25.00%
Allan Stephens
1
1.15%
1
12.50%
Total
87
100.00%
8
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Per Liden
528
36.49%
2
4.35%
Jon Paul Maloy
295
20.39%
13
28.26%
Ying Xue
294
20.32%
10
21.74%
Erik Hugne
210
14.51%
5
10.87%
Allan Stephens
105
7.26%
10
21.74%
Parthasarathy Bhuvaragan
9
0.62%
2
4.35%
Paul Gortmaker
2
0.14%
1
2.17%
Sam Ravnborg
2
0.14%
1
2.17%
Stephen Hemminger
1
0.07%
1
2.17%
Lucas De Marchi
1
0.07%
1
2.17%
Total
1447
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46
100.00%
Directory: net/tipc

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