v4.19.13 snapshot.
diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c
new file mode 100644
index 0000000..3cfeb9d
--- /dev/null
+++ b/net/tipc/name_distr.c
@@ -0,0 +1,347 @@
+/*
+ * 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);
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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_rcu(&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;
+}
+
+/**
+ * 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_rcu(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);
+ }
+}
+
+/**
+ * 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);
+}
+
+/**
+ * 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);
+}
+
+/**
+ * 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);
+}
+
+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);
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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);
+}
+
+/**
+ * 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);
+}