1 files changed, 78 insertions, 0 deletions

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 6ea2c15cfc88..17e6378c4dfe 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -51,6 +51,13 @@ static u32 tipc_num_nodes;
 static u32 tipc_num_links;
 static DEFINE_SPINLOCK(node_list_lock);
 
+struct tipc_sock_conn {
+	u32 port;
+	u32 peer_port;
+	u32 peer_node;
+	struct list_head list;
+};
+
 /*
  * A trivial power-of-two bitmask technique is used for speed, since this
  * operation is done for every incoming TIPC packet. The number of hash table
@@ -101,6 +108,7 @@ struct tipc_node *tipc_node_create(u32 addr)
 	INIT_HLIST_NODE(&n_ptr->hash);
 	INIT_LIST_HEAD(&n_ptr->list);
 	INIT_LIST_HEAD(&n_ptr->nsub);
+	INIT_LIST_HEAD(&n_ptr->conn_sks);
 	__skb_queue_head_init(&n_ptr->waiting_sks);
 
 	hlist_add_head_rcu(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
@@ -138,6 +146,71 @@ void tipc_node_stop(void)
 	spin_unlock_bh(&node_list_lock);
 }
 
+int tipc_node_add_conn(u32 dnode, u32 port, u32 peer_port)
+{
+	struct tipc_node *node;
+	struct tipc_sock_conn *conn;
+
+	if (in_own_node(dnode))
+		return 0;
+
+	node = tipc_node_find(dnode);
+	if (!node) {
+		pr_warn("Connecting sock to node 0x%x failed\n", dnode);
+		return -EHOSTUNREACH;
+	}
+	conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
+	if (!conn)
+		return -EHOSTUNREACH;
+	conn->peer_node = dnode;
+	conn->port = port;
+	conn->peer_port = peer_port;
+
+	tipc_node_lock(node);
+	list_add_tail(&conn->list, &node->conn_sks);
+	tipc_node_unlock(node);
+	return 0;
+}
+
+void tipc_node_remove_conn(u32 dnode, u32 port)
+{
+	struct tipc_node *node;
+	struct tipc_sock_conn *conn, *safe;
+
+	if (in_own_node(dnode))
+		return;
+
+	node = tipc_node_find(dnode);
+	if (!node)
+		return;
+
+	tipc_node_lock(node);
+	list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
+		if (port != conn->port)
+			continue;
+		list_del(&conn->list);
+		kfree(conn);
+	}
+	tipc_node_unlock(node);
+}
+
+void tipc_node_abort_sock_conns(struct list_head *conns)
+{
+	struct tipc_sock_conn *conn, *safe;
+	struct sk_buff *buf;
+
+	list_for_each_entry_safe(conn, safe, conns, list) {
+		buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
+				      SHORT_H_SIZE, 0, tipc_own_addr,
+				      conn->peer_node, conn->port,
+				      conn->peer_port, TIPC_ERR_NO_NODE);
+		if (likely(buf))
+			tipc_sk_rcv(buf);
+		list_del(&conn->list);
+		kfree(conn);
+	}
+}
+
 /**
  * tipc_node_link_up - handle addition of link
  *
@@ -476,6 +549,7 @@ int tipc_node_get_linkname(u32 bearer_id, u32 addr, char *linkname, size_t len)
 void tipc_node_unlock(struct tipc_node *node)
 {
 	LIST_HEAD(nsub_list);
+	LIST_HEAD(conn_sks);
 	struct sk_buff_head waiting_sks;
 	u32 addr = 0;
 
@@ -491,6 +565,7 @@ void tipc_node_unlock(struct tipc_node *node)
 	}
 	if (node->action_flags & TIPC_NOTIFY_NODE_DOWN) {
 		list_replace_init(&node->nsub, &nsub_list);
+		list_replace_init(&node->conn_sks, &conn_sks);
 		node->action_flags &= ~TIPC_NOTIFY_NODE_DOWN;
 	}
 	if (node->action_flags & TIPC_NOTIFY_NODE_UP) {
@@ -502,6 +577,9 @@ void tipc_node_unlock(struct tipc_node *node)
 	while (!skb_queue_empty(&waiting_sks))
 		tipc_sk_rcv(__skb_dequeue(&waiting_sks));
 
+	if (!list_empty(&conn_sks))
+		tipc_node_abort_sock_conns(&conn_sks);
+
 	if (!list_empty(&nsub_list))
 		tipc_nodesub_notify(&nsub_list);