![Ying Xue](/assets/img/avatar_default.png)
Locking dependency detected below possible unsafe locking scenario: CPU0 CPU1 T0: tipc_named_rcv() tipc_rcv() T1: [grab nametble write lock]* [grab node lock]* T2: tipc_update_nametbl() tipc_node_link_up() T3: tipc_nodesub_subscribe() tipc_nametbl_publish() T4: [grab node lock]* [grab nametble write lock]* The opposite order of holding nametbl write lock and node lock on above two different paths may result in a deadlock. If we move the the updating of the name table after link state named out of node lock, the reverse order of holding locks will be eliminated, and as a result, the deadlock risk. Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
604 lines
16 KiB
C
604 lines
16 KiB
C
/*
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* net/tipc/node.c: TIPC node management routines
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*
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* Copyright (c) 2000-2006, 2012-2014, Ericsson AB
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* Copyright (c) 2005-2006, 2010-2014, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "config.h"
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#include "node.h"
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#include "name_distr.h"
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#include "socket.h"
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#define NODE_HTABLE_SIZE 512
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static void node_lost_contact(struct tipc_node *n_ptr);
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static void node_established_contact(struct tipc_node *n_ptr);
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static struct hlist_head node_htable[NODE_HTABLE_SIZE];
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LIST_HEAD(tipc_node_list);
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static u32 tipc_num_nodes;
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static u32 tipc_num_links;
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static DEFINE_SPINLOCK(node_list_lock);
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struct tipc_sock_conn {
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u32 port;
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u32 peer_port;
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u32 peer_node;
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struct list_head list;
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};
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/*
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* A trivial power-of-two bitmask technique is used for speed, since this
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* operation is done for every incoming TIPC packet. The number of hash table
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* entries has been chosen so that no hash chain exceeds 8 nodes and will
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* usually be much smaller (typically only a single node).
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*/
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static unsigned int tipc_hashfn(u32 addr)
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{
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return addr & (NODE_HTABLE_SIZE - 1);
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}
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/*
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* tipc_node_find - locate specified node object, if it exists
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*/
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struct tipc_node *tipc_node_find(u32 addr)
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{
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struct tipc_node *node;
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if (unlikely(!in_own_cluster_exact(addr)))
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return NULL;
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rcu_read_lock();
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hlist_for_each_entry_rcu(node, &node_htable[tipc_hashfn(addr)], hash) {
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if (node->addr == addr) {
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rcu_read_unlock();
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return node;
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}
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}
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rcu_read_unlock();
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return NULL;
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}
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struct tipc_node *tipc_node_create(u32 addr)
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{
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struct tipc_node *n_ptr, *temp_node;
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spin_lock_bh(&node_list_lock);
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n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
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if (!n_ptr) {
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spin_unlock_bh(&node_list_lock);
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pr_warn("Node creation failed, no memory\n");
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return NULL;
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}
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n_ptr->addr = addr;
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spin_lock_init(&n_ptr->lock);
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INIT_HLIST_NODE(&n_ptr->hash);
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INIT_LIST_HEAD(&n_ptr->list);
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INIT_LIST_HEAD(&n_ptr->nsub);
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INIT_LIST_HEAD(&n_ptr->conn_sks);
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__skb_queue_head_init(&n_ptr->waiting_sks);
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hlist_add_head_rcu(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
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list_for_each_entry_rcu(temp_node, &tipc_node_list, list) {
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if (n_ptr->addr < temp_node->addr)
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break;
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}
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list_add_tail_rcu(&n_ptr->list, &temp_node->list);
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n_ptr->action_flags = TIPC_WAIT_PEER_LINKS_DOWN;
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n_ptr->signature = INVALID_NODE_SIG;
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tipc_num_nodes++;
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spin_unlock_bh(&node_list_lock);
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return n_ptr;
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}
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static void tipc_node_delete(struct tipc_node *n_ptr)
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{
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list_del_rcu(&n_ptr->list);
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hlist_del_rcu(&n_ptr->hash);
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kfree_rcu(n_ptr, rcu);
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tipc_num_nodes--;
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}
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void tipc_node_stop(void)
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{
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struct tipc_node *node, *t_node;
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spin_lock_bh(&node_list_lock);
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list_for_each_entry_safe(node, t_node, &tipc_node_list, list)
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tipc_node_delete(node);
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spin_unlock_bh(&node_list_lock);
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}
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int tipc_node_add_conn(u32 dnode, u32 port, u32 peer_port)
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{
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struct tipc_node *node;
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struct tipc_sock_conn *conn;
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if (in_own_node(dnode))
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return 0;
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node = tipc_node_find(dnode);
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if (!node) {
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pr_warn("Connecting sock to node 0x%x failed\n", dnode);
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return -EHOSTUNREACH;
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}
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conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
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if (!conn)
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return -EHOSTUNREACH;
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conn->peer_node = dnode;
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conn->port = port;
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conn->peer_port = peer_port;
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tipc_node_lock(node);
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list_add_tail(&conn->list, &node->conn_sks);
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tipc_node_unlock(node);
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return 0;
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}
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void tipc_node_remove_conn(u32 dnode, u32 port)
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{
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struct tipc_node *node;
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struct tipc_sock_conn *conn, *safe;
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if (in_own_node(dnode))
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return;
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node = tipc_node_find(dnode);
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if (!node)
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return;
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tipc_node_lock(node);
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list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
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if (port != conn->port)
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continue;
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list_del(&conn->list);
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kfree(conn);
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}
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tipc_node_unlock(node);
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}
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void tipc_node_abort_sock_conns(struct list_head *conns)
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{
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struct tipc_sock_conn *conn, *safe;
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struct sk_buff *buf;
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list_for_each_entry_safe(conn, safe, conns, list) {
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buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
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SHORT_H_SIZE, 0, tipc_own_addr,
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conn->peer_node, conn->port,
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conn->peer_port, TIPC_ERR_NO_NODE);
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if (likely(buf))
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tipc_sk_rcv(buf);
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list_del(&conn->list);
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kfree(conn);
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}
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}
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/**
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* tipc_node_link_up - handle addition of link
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*
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* Link becomes active (alone or shared) or standby, depending on its priority.
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*/
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void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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struct tipc_link **active = &n_ptr->active_links[0];
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n_ptr->working_links++;
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n_ptr->action_flags |= TIPC_NOTIFY_LINK_UP;
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n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id;
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pr_info("Established link <%s> on network plane %c\n",
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l_ptr->name, l_ptr->net_plane);
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if (!active[0]) {
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active[0] = active[1] = l_ptr;
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node_established_contact(n_ptr);
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goto exit;
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}
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if (l_ptr->priority < active[0]->priority) {
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pr_info("New link <%s> becomes standby\n", l_ptr->name);
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goto exit;
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}
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tipc_link_dup_queue_xmit(active[0], l_ptr);
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if (l_ptr->priority == active[0]->priority) {
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active[0] = l_ptr;
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goto exit;
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}
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pr_info("Old link <%s> becomes standby\n", active[0]->name);
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if (active[1] != active[0])
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pr_info("Old link <%s> becomes standby\n", active[1]->name);
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active[0] = active[1] = l_ptr;
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exit:
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/* Leave room for changeover header when returning 'mtu' to users: */
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n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE;
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n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE;
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}
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/**
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* node_select_active_links - select active link
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*/
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static void node_select_active_links(struct tipc_node *n_ptr)
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{
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struct tipc_link **active = &n_ptr->active_links[0];
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u32 i;
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u32 highest_prio = 0;
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active[0] = active[1] = NULL;
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for (i = 0; i < MAX_BEARERS; i++) {
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struct tipc_link *l_ptr = n_ptr->links[i];
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if (!l_ptr || !tipc_link_is_up(l_ptr) ||
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(l_ptr->priority < highest_prio))
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continue;
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if (l_ptr->priority > highest_prio) {
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highest_prio = l_ptr->priority;
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active[0] = active[1] = l_ptr;
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} else {
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active[1] = l_ptr;
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}
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}
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}
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/**
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* tipc_node_link_down - handle loss of link
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*/
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void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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struct tipc_link **active;
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n_ptr->working_links--;
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n_ptr->action_flags |= TIPC_NOTIFY_LINK_DOWN;
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n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id;
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if (!tipc_link_is_active(l_ptr)) {
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pr_info("Lost standby link <%s> on network plane %c\n",
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l_ptr->name, l_ptr->net_plane);
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return;
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}
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pr_info("Lost link <%s> on network plane %c\n",
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l_ptr->name, l_ptr->net_plane);
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active = &n_ptr->active_links[0];
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if (active[0] == l_ptr)
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active[0] = active[1];
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if (active[1] == l_ptr)
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active[1] = active[0];
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if (active[0] == l_ptr)
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node_select_active_links(n_ptr);
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if (tipc_node_is_up(n_ptr))
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tipc_link_failover_send_queue(l_ptr);
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else
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node_lost_contact(n_ptr);
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/* Leave room for changeover header when returning 'mtu' to users: */
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if (active[0]) {
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n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE;
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n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE;
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return;
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}
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/* Loopback link went down? No fragmentation needed from now on. */
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if (n_ptr->addr == tipc_own_addr) {
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n_ptr->act_mtus[0] = MAX_MSG_SIZE;
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n_ptr->act_mtus[1] = MAX_MSG_SIZE;
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}
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}
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int tipc_node_active_links(struct tipc_node *n_ptr)
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{
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return n_ptr->active_links[0] != NULL;
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}
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int tipc_node_is_up(struct tipc_node *n_ptr)
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{
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return tipc_node_active_links(n_ptr);
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}
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void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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n_ptr->links[l_ptr->bearer_id] = l_ptr;
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spin_lock_bh(&node_list_lock);
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tipc_num_links++;
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spin_unlock_bh(&node_list_lock);
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n_ptr->link_cnt++;
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}
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void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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int i;
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for (i = 0; i < MAX_BEARERS; i++) {
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if (l_ptr != n_ptr->links[i])
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continue;
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n_ptr->links[i] = NULL;
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spin_lock_bh(&node_list_lock);
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tipc_num_links--;
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spin_unlock_bh(&node_list_lock);
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n_ptr->link_cnt--;
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}
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}
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static void node_established_contact(struct tipc_node *n_ptr)
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{
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n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP;
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n_ptr->bclink.oos_state = 0;
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n_ptr->bclink.acked = tipc_bclink_get_last_sent();
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tipc_bclink_add_node(n_ptr->addr);
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}
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static void node_lost_contact(struct tipc_node *n_ptr)
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{
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char addr_string[16];
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u32 i;
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pr_info("Lost contact with %s\n",
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tipc_addr_string_fill(addr_string, n_ptr->addr));
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/* Flush broadcast link info associated with lost node */
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if (n_ptr->bclink.recv_permitted) {
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kfree_skb_list(n_ptr->bclink.deferred_head);
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n_ptr->bclink.deferred_size = 0;
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if (n_ptr->bclink.reasm_buf) {
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kfree_skb(n_ptr->bclink.reasm_buf);
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n_ptr->bclink.reasm_buf = NULL;
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}
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tipc_bclink_remove_node(n_ptr->addr);
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tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ);
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n_ptr->bclink.recv_permitted = false;
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}
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/* Abort link changeover */
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for (i = 0; i < MAX_BEARERS; i++) {
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struct tipc_link *l_ptr = n_ptr->links[i];
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if (!l_ptr)
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continue;
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l_ptr->reset_checkpoint = l_ptr->next_in_no;
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l_ptr->exp_msg_count = 0;
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tipc_link_reset_fragments(l_ptr);
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}
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n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN;
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/* Notify subscribers and prevent re-contact with node until
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* cleanup is done.
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*/
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n_ptr->action_flags |= TIPC_WAIT_PEER_LINKS_DOWN |
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TIPC_NOTIFY_NODE_DOWN;
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}
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struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
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{
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u32 domain;
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struct sk_buff *buf;
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struct tipc_node *n_ptr;
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struct tipc_node_info node_info;
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u32 payload_size;
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if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
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return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
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domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
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if (!tipc_addr_domain_valid(domain))
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return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
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" (network address)");
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spin_lock_bh(&node_list_lock);
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if (!tipc_num_nodes) {
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spin_unlock_bh(&node_list_lock);
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return tipc_cfg_reply_none();
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}
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/* For now, get space for all other nodes */
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payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes;
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if (payload_size > 32768u) {
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spin_unlock_bh(&node_list_lock);
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return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
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" (too many nodes)");
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}
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spin_unlock_bh(&node_list_lock);
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buf = tipc_cfg_reply_alloc(payload_size);
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if (!buf)
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return NULL;
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/* Add TLVs for all nodes in scope */
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rcu_read_lock();
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list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
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if (!tipc_in_scope(domain, n_ptr->addr))
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continue;
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node_info.addr = htonl(n_ptr->addr);
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node_info.up = htonl(tipc_node_is_up(n_ptr));
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tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO,
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&node_info, sizeof(node_info));
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}
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rcu_read_unlock();
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return buf;
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}
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struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
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{
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u32 domain;
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struct sk_buff *buf;
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struct tipc_node *n_ptr;
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struct tipc_link_info link_info;
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u32 payload_size;
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if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
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return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
|
|
|
|
domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
|
|
if (!tipc_addr_domain_valid(domain))
|
|
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
|
|
" (network address)");
|
|
|
|
if (!tipc_own_addr)
|
|
return tipc_cfg_reply_none();
|
|
|
|
spin_lock_bh(&node_list_lock);
|
|
/* Get space for all unicast links + broadcast link */
|
|
payload_size = TLV_SPACE((sizeof(link_info)) * (tipc_num_links + 1));
|
|
if (payload_size > 32768u) {
|
|
spin_unlock_bh(&node_list_lock);
|
|
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
|
|
" (too many links)");
|
|
}
|
|
spin_unlock_bh(&node_list_lock);
|
|
|
|
buf = tipc_cfg_reply_alloc(payload_size);
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
/* Add TLV for broadcast link */
|
|
link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr));
|
|
link_info.up = htonl(1);
|
|
strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME);
|
|
tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
|
|
|
|
/* Add TLVs for any other links in scope */
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
|
|
u32 i;
|
|
|
|
if (!tipc_in_scope(domain, n_ptr->addr))
|
|
continue;
|
|
tipc_node_lock(n_ptr);
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
if (!n_ptr->links[i])
|
|
continue;
|
|
link_info.dest = htonl(n_ptr->addr);
|
|
link_info.up = htonl(tipc_link_is_up(n_ptr->links[i]));
|
|
strcpy(link_info.str, n_ptr->links[i]->name);
|
|
tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO,
|
|
&link_info, sizeof(link_info));
|
|
}
|
|
tipc_node_unlock(n_ptr);
|
|
}
|
|
rcu_read_unlock();
|
|
return buf;
|
|
}
|
|
|
|
/**
|
|
* tipc_node_get_linkname - get the name of a link
|
|
*
|
|
* @bearer_id: id of the bearer
|
|
* @node: peer node address
|
|
* @linkname: link name output buffer
|
|
*
|
|
* Returns 0 on success
|
|
*/
|
|
int tipc_node_get_linkname(u32 bearer_id, u32 addr, char *linkname, size_t len)
|
|
{
|
|
struct tipc_link *link;
|
|
struct tipc_node *node = tipc_node_find(addr);
|
|
|
|
if ((bearer_id >= MAX_BEARERS) || !node)
|
|
return -EINVAL;
|
|
tipc_node_lock(node);
|
|
link = node->links[bearer_id];
|
|
if (link) {
|
|
strncpy(linkname, link->name, len);
|
|
tipc_node_unlock(node);
|
|
return 0;
|
|
}
|
|
tipc_node_unlock(node);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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;
|
|
int flags = node->action_flags;
|
|
u32 link_id = 0;
|
|
|
|
if (likely(!flags)) {
|
|
spin_unlock_bh(&node->lock);
|
|
return;
|
|
}
|
|
|
|
addr = node->addr;
|
|
link_id = node->link_id;
|
|
__skb_queue_head_init(&waiting_sks);
|
|
|
|
if (flags & TIPC_WAKEUP_USERS)
|
|
skb_queue_splice_init(&node->waiting_sks, &waiting_sks);
|
|
|
|
if (flags & TIPC_NOTIFY_NODE_DOWN) {
|
|
list_replace_init(&node->nsub, &nsub_list);
|
|
list_replace_init(&node->conn_sks, &conn_sks);
|
|
}
|
|
node->action_flags &= ~(TIPC_WAKEUP_USERS | TIPC_NOTIFY_NODE_DOWN |
|
|
TIPC_NOTIFY_NODE_UP | TIPC_NOTIFY_LINK_UP |
|
|
TIPC_NOTIFY_LINK_DOWN |
|
|
TIPC_WAKEUP_BCAST_USERS);
|
|
|
|
spin_unlock_bh(&node->lock);
|
|
|
|
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);
|
|
|
|
if (flags & TIPC_WAKEUP_BCAST_USERS)
|
|
tipc_bclink_wakeup_users();
|
|
|
|
if (flags & TIPC_NOTIFY_NODE_UP)
|
|
tipc_named_node_up(addr);
|
|
|
|
if (flags & TIPC_NOTIFY_LINK_UP)
|
|
tipc_nametbl_publish(TIPC_LINK_STATE, addr, addr,
|
|
TIPC_NODE_SCOPE, link_id, addr);
|
|
|
|
if (flags & TIPC_NOTIFY_LINK_DOWN)
|
|
tipc_nametbl_withdraw(TIPC_LINK_STATE, addr,
|
|
link_id, addr);
|
|
}
|