![Jon Paul Maloy](/assets/img/avatar_default.png)
After the previous commit, we can now give the functions with temporary names, such as tipc_link_xmit2(), tipc_msg_build2() etc., their proper names. There are no functional changes in this commit. Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
338 lines
9.2 KiB
C
338 lines
9.2 KiB
C
/*
|
|
* 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 *obuf;
|
|
struct tipc_node *node;
|
|
u32 dnode;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(node, &tipc_node_list, list) {
|
|
dnode = node->addr;
|
|
if (in_own_node(dnode))
|
|
continue;
|
|
if (!tipc_node_active_links(node))
|
|
continue;
|
|
obuf = skb_copy(buf, GFP_ATOMIC);
|
|
if (!obuf)
|
|
break;
|
|
msg_set_destnode(buf_msg(obuf), dnode);
|
|
tipc_link_xmit(obuf, dnode, dnode);
|
|
}
|
|
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
|
|
* @msg_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 list_head *msg_list, u32 dnode,
|
|
struct publ_list *pls)
|
|
{
|
|
struct publication *publ;
|
|
struct sk_buff *buf = NULL;
|
|
struct distr_item *item = NULL;
|
|
uint dsz = pls->size * ITEM_SIZE;
|
|
uint msg_dsz = (tipc_node_get_mtu(dnode, 0) / ITEM_SIZE) * ITEM_SIZE;
|
|
uint rem = dsz;
|
|
uint msg_rem = 0;
|
|
|
|
list_for_each_entry(publ, &pls->list, local_list) {
|
|
/* Prepare next buffer: */
|
|
if (!buf) {
|
|
msg_rem = min_t(uint, rem, msg_dsz);
|
|
rem -= msg_rem;
|
|
buf = named_prepare_buf(PUBLICATION, msg_rem, dnode);
|
|
if (!buf) {
|
|
pr_warn("Bulk publication failure\n");
|
|
return;
|
|
}
|
|
item = (struct distr_item *)msg_data(buf_msg(buf));
|
|
}
|
|
|
|
/* Pack publication into message: */
|
|
publ_to_item(item, publ);
|
|
item++;
|
|
msg_rem -= ITEM_SIZE;
|
|
|
|
/* Append full buffer to list: */
|
|
if (!msg_rem) {
|
|
list_add_tail((struct list_head *)buf, msg_list);
|
|
buf = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_named_node_up - tell specified node about all publications by this node
|
|
*/
|
|
void tipc_named_node_up(u32 dnode)
|
|
{
|
|
LIST_HEAD(msg_list);
|
|
struct sk_buff *buf_chain;
|
|
|
|
read_lock_bh(&tipc_nametbl_lock);
|
|
named_distribute(&msg_list, dnode, &publ_cluster);
|
|
named_distribute(&msg_list, dnode, &publ_zone);
|
|
read_unlock_bh(&tipc_nametbl_lock);
|
|
|
|
/* Convert circular list to linear list and send: */
|
|
buf_chain = (struct sk_buff *)msg_list.next;
|
|
((struct sk_buff *)msg_list.prev)->next = NULL;
|
|
tipc_link_xmit(buf_chain, dnode, dnode);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|