WSL2-Linux-Kernel/net/tipc/name_distr.c

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C
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/*
* 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"
#define ITEM_SIZE sizeof(struct distr_item)
/**
* struct distr_item - publication info distributed to other nodes
* @type: name sequence type
* @lower: name sequence lower bound
* @upper: name sequence upper bound
* @ref: publishing port reference
* @key: publication key
*
* ===> All fields are stored in network byte order. <===
*
* First 3 fields identify (name or) name sequence being published.
* Reference field uniquely identifies port that published name sequence.
* Key field uniquely identifies publication, in the event a port has
* multiple publications of the same name sequence.
*
* Note: There is no field that identifies the publishing node because it is
* the same for all items contained within a publication message.
*/
struct distr_item {
__be32 type;
__be32 lower;
__be32 upper;
__be32 ref;
__be32 key;
};
/**
* 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) {
spin_lock_bh(&n_ptr->lock);
l_ptr = n_ptr->active_links[n_ptr->addr & 1];
if (l_ptr) {
buf_copy = skb_copy(buf, GFP_ATOMIC);
if (!buf_copy) {
spin_unlock_bh(&n_ptr->lock);
break;
}
msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
__tipc_link_xmit(l_ptr, buf_copy);
}
spin_unlock_bh(&n_ptr->lock);
}
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(unsigned long nodearg)
{
struct tipc_node *n_ptr;
struct tipc_link *l_ptr;
struct list_head message_list;
u32 node = (u32)nodearg;
u32 max_item_buf = 0;
/* compute maximum amount of publication data to send per message */
n_ptr = tipc_node_find(node);
if (n_ptr) {
tipc_node_lock(n_ptr);
l_ptr = n_ptr->active_links[0];
if (l_ptr)
max_item_buf = ((l_ptr->max_pkt - INT_H_SIZE) /
ITEM_SIZE) * ITEM_SIZE;
tipc_node_unlock(n_ptr);
}
if (!max_item_buf)
return;
/* create list of publication messages, then send them as a unit */
INIT_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: align tipc function names with common naming practice in the network Rename the following functions, which are shorter and more in line with common naming practice in the network subsystem. tipc_bclink_send_msg->tipc_bclink_xmit tipc_bclink_recv_pkt->tipc_bclink_rcv tipc_disc_recv_msg->tipc_disc_rcv tipc_link_send_proto_msg->tipc_link_proto_xmit link_recv_proto_msg->tipc_link_proto_rcv link_send_sections_long->tipc_link_iovec_long_xmit tipc_link_send_sections_fast->tipc_link_iovec_xmit_fast tipc_link_send_sync->tipc_link_sync_xmit tipc_link_recv_sync->tipc_link_sync_rcv tipc_link_send_buf->__tipc_link_xmit tipc_link_send->tipc_link_xmit tipc_link_send_names->tipc_link_names_xmit tipc_named_recv->tipc_named_rcv tipc_link_recv_bundle->tipc_link_bundle_rcv tipc_link_dup_send_queue->tipc_link_dup_queue_xmit link_send_long_buf->tipc_link_frag_xmit tipc_multicast->tipc_port_mcast_xmit tipc_port_recv_mcast->tipc_port_mcast_rcv tipc_port_reject_sections->tipc_port_iovec_reject tipc_port_recv_proto_msg->tipc_port_proto_rcv tipc_connect->tipc_port_connect __tipc_connect->__tipc_port_connect __tipc_disconnect->__tipc_port_disconnect tipc_disconnect->tipc_port_disconnect tipc_shutdown->tipc_port_shutdown tipc_port_recv_msg->tipc_port_rcv tipc_port_recv_sections->tipc_port_iovec_rcv release->tipc_release accept->tipc_accept bind->tipc_bind get_name->tipc_getname poll->tipc_poll send_msg->tipc_sendmsg send_packet->tipc_send_packet send_stream->tipc_send_stream recv_msg->tipc_recvmsg recv_stream->tipc_recv_stream connect->tipc_connect listen->tipc_listen shutdown->tipc_shutdown setsockopt->tipc_setsockopt getsockopt->tipc_getsockopt Above changes have no impact on current users of the functions. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-02-18 12:06:46 +04:00
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: align tipc function names with common naming practice in the network Rename the following functions, which are shorter and more in line with common naming practice in the network subsystem. tipc_bclink_send_msg->tipc_bclink_xmit tipc_bclink_recv_pkt->tipc_bclink_rcv tipc_disc_recv_msg->tipc_disc_rcv tipc_link_send_proto_msg->tipc_link_proto_xmit link_recv_proto_msg->tipc_link_proto_rcv link_send_sections_long->tipc_link_iovec_long_xmit tipc_link_send_sections_fast->tipc_link_iovec_xmit_fast tipc_link_send_sync->tipc_link_sync_xmit tipc_link_recv_sync->tipc_link_sync_rcv tipc_link_send_buf->__tipc_link_xmit tipc_link_send->tipc_link_xmit tipc_link_send_names->tipc_link_names_xmit tipc_named_recv->tipc_named_rcv tipc_link_recv_bundle->tipc_link_bundle_rcv tipc_link_dup_send_queue->tipc_link_dup_queue_xmit link_send_long_buf->tipc_link_frag_xmit tipc_multicast->tipc_port_mcast_xmit tipc_port_recv_mcast->tipc_port_mcast_rcv tipc_port_reject_sections->tipc_port_iovec_reject tipc_port_recv_proto_msg->tipc_port_proto_rcv tipc_connect->tipc_port_connect __tipc_connect->__tipc_port_connect __tipc_disconnect->__tipc_port_disconnect tipc_disconnect->tipc_port_disconnect tipc_shutdown->tipc_port_shutdown tipc_port_recv_msg->tipc_port_rcv tipc_port_recv_sections->tipc_port_iovec_rcv release->tipc_release accept->tipc_accept bind->tipc_bind get_name->tipc_getname poll->tipc_poll send_msg->tipc_sendmsg send_packet->tipc_send_packet send_stream->tipc_send_stream recv_msg->tipc_recvmsg recv_stream->tipc_recv_stream connect->tipc_connect listen->tipc_listen shutdown->tipc_shutdown setsockopt->tipc_setsockopt getsockopt->tipc_getsockopt Above changes have no impact on current users of the functions. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-02-18 12:06:46 +04:00
* tipc_named_rcv - process name table update message sent by another node
*/
tipc: align tipc function names with common naming practice in the network Rename the following functions, which are shorter and more in line with common naming practice in the network subsystem. tipc_bclink_send_msg->tipc_bclink_xmit tipc_bclink_recv_pkt->tipc_bclink_rcv tipc_disc_recv_msg->tipc_disc_rcv tipc_link_send_proto_msg->tipc_link_proto_xmit link_recv_proto_msg->tipc_link_proto_rcv link_send_sections_long->tipc_link_iovec_long_xmit tipc_link_send_sections_fast->tipc_link_iovec_xmit_fast tipc_link_send_sync->tipc_link_sync_xmit tipc_link_recv_sync->tipc_link_sync_rcv tipc_link_send_buf->__tipc_link_xmit tipc_link_send->tipc_link_xmit tipc_link_send_names->tipc_link_names_xmit tipc_named_recv->tipc_named_rcv tipc_link_recv_bundle->tipc_link_bundle_rcv tipc_link_dup_send_queue->tipc_link_dup_queue_xmit link_send_long_buf->tipc_link_frag_xmit tipc_multicast->tipc_port_mcast_xmit tipc_port_recv_mcast->tipc_port_mcast_rcv tipc_port_reject_sections->tipc_port_iovec_reject tipc_port_recv_proto_msg->tipc_port_proto_rcv tipc_connect->tipc_port_connect __tipc_connect->__tipc_port_connect __tipc_disconnect->__tipc_port_disconnect tipc_disconnect->tipc_port_disconnect tipc_shutdown->tipc_port_shutdown tipc_port_recv_msg->tipc_port_rcv tipc_port_recv_sections->tipc_port_iovec_rcv release->tipc_release accept->tipc_accept bind->tipc_bind get_name->tipc_getname poll->tipc_poll send_msg->tipc_sendmsg send_packet->tipc_send_packet send_stream->tipc_send_stream recv_msg->tipc_recvmsg recv_stream->tipc_recv_stream connect->tipc_connect listen->tipc_listen shutdown->tipc_shutdown setsockopt->tipc_setsockopt getsockopt->tipc_getsockopt Above changes have no impact on current users of the functions. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-02-18 12:06:46 +04:00
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);
}