forked from Minki/linux
84602761ca
A deadlock might occur if name table is withdrawn in socket release
routine, and while packets are still being received from bearer.
CPU0 CPU1
T0: recv_msg() release()
T1: tipc_recv_msg() tipc_withdraw()
T2: [grab node lock] [grab port lock]
T3: tipc_link_wakeup_ports() tipc_nametbl_withdraw()
T4: [grab port lock]* named_cluster_distribute()
T5: wakeupdispatch() tipc_link_send()
T6: [grab node lock]*
The opposite order of holding port lock and node lock on above two
different paths may result in a deadlock. If socket lock instead of
port lock is used to protect port instance in tipc_withdraw(), the
reverse order of holding port lock and node lock will be eliminated,
as a result, the deadlock is killed as well.
Reported-by: Lars Everbrand <lars.everbrand@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
202 lines
7.0 KiB
C
202 lines
7.0 KiB
C
/*
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* net/tipc/port.h: Include file for TIPC port code
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*
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* Copyright (c) 1994-2007, Ericsson AB
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* Copyright (c) 2004-2007, 2010-2013, 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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#ifndef _TIPC_PORT_H
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#define _TIPC_PORT_H
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#include "ref.h"
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#include "net.h"
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#include "msg.h"
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#include "node_subscr.h"
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#define TIPC_FLOW_CONTROL_WIN 512
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#define CONN_OVERLOAD_LIMIT ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
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SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
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/**
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* struct tipc_port - TIPC port structure
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* @sk: pointer to socket handle
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* @lock: pointer to spinlock for controlling access to port
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* @connected: non-zero if port is currently connected to a peer port
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* @conn_type: TIPC type used when connection was established
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* @conn_instance: TIPC instance used when connection was established
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* @conn_unacked: number of unacknowledged messages received from peer port
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* @published: non-zero if port has one or more associated names
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* @congested: non-zero if cannot send because of link or port congestion
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* @max_pkt: maximum packet size "hint" used when building messages sent by port
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* @ref: unique reference to port in TIPC object registry
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* @phdr: preformatted message header used when sending messages
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* @port_list: adjacent ports in TIPC's global list of ports
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* @dispatcher: ptr to routine which handles received messages
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* @wakeup: ptr to routine to call when port is no longer congested
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* @wait_list: adjacent ports in list of ports waiting on link congestion
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* @waiting_pkts:
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* @sent: # of non-empty messages sent by port
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* @acked: # of non-empty message acknowledgements from connected port's peer
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* @publications: list of publications for port
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* @pub_count: total # of publications port has made during its lifetime
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* @probing_state:
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* @probing_interval:
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* @timer_ref:
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* @subscription: "node down" subscription used to terminate failed connections
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*/
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struct tipc_port {
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struct sock *sk;
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spinlock_t *lock;
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int connected;
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u32 conn_type;
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u32 conn_instance;
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u32 conn_unacked;
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int published;
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u32 congested;
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u32 max_pkt;
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u32 ref;
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struct tipc_msg phdr;
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struct list_head port_list;
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u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
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void (*wakeup)(struct tipc_port *);
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struct list_head wait_list;
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u32 waiting_pkts;
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u32 sent;
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u32 acked;
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struct list_head publications;
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u32 pub_count;
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u32 probing_state;
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u32 probing_interval;
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struct timer_list timer;
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struct tipc_node_subscr subscription;
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};
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extern spinlock_t tipc_port_list_lock;
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struct tipc_port_list;
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/*
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* TIPC port manipulation routines
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*/
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struct tipc_port *tipc_createport(struct sock *sk,
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u32 (*dispatcher)(struct tipc_port *,
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struct sk_buff *),
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void (*wakeup)(struct tipc_port *),
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const u32 importance);
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int tipc_reject_msg(struct sk_buff *buf, u32 err);
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void tipc_acknowledge(u32 port_ref, u32 ack);
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int tipc_deleteport(struct tipc_port *p_ptr);
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int tipc_portimportance(u32 portref, unsigned int *importance);
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int tipc_set_portimportance(u32 portref, unsigned int importance);
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int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
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int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
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int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
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int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
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int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
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struct tipc_name_seq const *name_seq);
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int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
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struct tipc_name_seq const *name_seq);
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int tipc_connect(u32 portref, struct tipc_portid const *port);
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int tipc_disconnect(u32 portref);
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int tipc_shutdown(u32 ref);
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/*
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* The following routines require that the port be locked on entry
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*/
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int __tipc_disconnect(struct tipc_port *tp_ptr);
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int __tipc_connect(u32 ref, struct tipc_port *p_ptr,
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struct tipc_portid const *peer);
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int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
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/*
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* TIPC messaging routines
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*/
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int tipc_port_recv_msg(struct sk_buff *buf);
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int tipc_send(u32 portref, struct iovec const *msg_sect, unsigned int len);
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int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
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struct iovec const *msg_sect, unsigned int len);
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int tipc_send2port(u32 portref, struct tipc_portid const *dest,
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struct iovec const *msg_sect, unsigned int len);
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int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
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struct iovec const *msg, unsigned int len);
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int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
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struct iovec const *msg_sect, unsigned int len,
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int err);
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struct sk_buff *tipc_port_get_ports(void);
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void tipc_port_recv_proto_msg(struct sk_buff *buf);
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void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp);
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void tipc_port_reinit(void);
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/**
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* tipc_port_lock - lock port instance referred to and return its pointer
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*/
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static inline struct tipc_port *tipc_port_lock(u32 ref)
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{
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return (struct tipc_port *)tipc_ref_lock(ref);
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}
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/**
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* tipc_port_unlock - unlock a port instance
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*
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* Can use pointer instead of tipc_ref_unlock() since port is already locked.
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*/
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static inline void tipc_port_unlock(struct tipc_port *p_ptr)
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{
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spin_unlock_bh(p_ptr->lock);
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}
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static inline struct tipc_port *tipc_port_deref(u32 ref)
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{
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return (struct tipc_port *)tipc_ref_deref(ref);
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}
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static inline int tipc_port_congested(struct tipc_port *p_ptr)
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{
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return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
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}
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#endif
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