![Jon Paul Maloy](/assets/img/avatar_default.png)
In the current implementation, each 'struct tipc_node' instance keeps a linked list of those ports/sockets that are connected to the node represented by that struct. The purpose of this is to let the node object know which sockets to alert when it loses contact with its peer node, i.e., which sockets need to have their connections aborted. This entails an unwanted direct reference from the node structure back to the port/socket structure, and a need to grab port_lock when we have to make an upcall to the port. We want to get rid of this unecessary BH entry point into the socket, and also eliminate its use of port_lock. In this commit, we instead let the node struct keep list of "connected socket" structs, which each represents a connected socket, but is allocated independently by the node at the moment of connection. If the node loses contact with its peer node, the list is traversed, and a "connection abort" message is created for each entry in the list. The message is sent to it respective connected socket using the ordinary data path, and the receiving socket aborts its connections upon reception of the message. This enables us to get rid of the direct reference from 'struct node' to ´struct port', and another unwanted BH access point to the latter. 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>
589 lines
15 KiB
C
589 lines
15 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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u32 addr = n_ptr->addr;
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n_ptr->working_links++;
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tipc_nametbl_publish(TIPC_LINK_STATE, addr, addr, TIPC_NODE_SCOPE,
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l_ptr->bearer_id, addr);
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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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u32 addr = n_ptr->addr;
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n_ptr->working_links--;
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tipc_nametbl_withdraw(TIPC_LINK_STATE, addr, l_ptr->bearer_id, addr);
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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;
|
|
struct tipc_link_info link_info;
|
|
u32 payload_size;
|
|
|
|
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
|
|
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;
|
|
|
|
if (likely(!node->action_flags)) {
|
|
spin_unlock_bh(&node->lock);
|
|
return;
|
|
}
|
|
|
|
__skb_queue_head_init(&waiting_sks);
|
|
if (node->action_flags & TIPC_WAKEUP_USERS) {
|
|
skb_queue_splice_init(&node->waiting_sks, &waiting_sks);
|
|
node->action_flags &= ~TIPC_WAKEUP_USERS;
|
|
}
|
|
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) {
|
|
node->action_flags &= ~TIPC_NOTIFY_NODE_UP;
|
|
addr = node->addr;
|
|
}
|
|
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 (addr)
|
|
tipc_named_node_up(addr);
|
|
}
|