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c0b14a0854
TIPC link can temporarily fall into "half-establish" that only one of
the link endpoints is ESTABLISHED and starts to send traffic, PROTOCOL
messages, whereas the other link endpoint is not up (e.g. immediately
when the endpoint receives ACTIVATE_MSG, the network interface goes
down...).
This is a normal situation and will be settled because the link
endpoint will be eventually brought down after the link tolerance time.
However, the situation will become worse when the second link is
established before the first link endpoint goes down,
For example:
1. Both links <1A-2A>, <1B-2B> down
2. Link endpoint 2A up, but 1A still down (e.g. due to network
disturbance, wrong session, etc.)
3. Link <1B-2B> up
4. Link endpoint 2A down (e.g. due to link tolerance timeout)
5. Node B starts failover onto link <1B-2B>
==> Node A does never start link failover.
When the "half-failover" situation happens, two consequences have been
observed:
a) Peer link/node gets stuck in FAILINGOVER state;
b) Traffic or user messages that peer node is trying to failover onto
the second link can be partially or completely dropped by this node.
The consequence a) was actually solved by commit c140eb166d ("tipc:
fix failover problem"), but that commit didn't cover the b). It's due
to the fact that the tunnel link endpoint has never been prepared for a
failover, so the 'l->drop_point' (and the other data...) is not set
correctly. When a TUNNEL_MSG from peer node arrives on the link,
depending on the inner message's seqno and the current 'l->drop_point'
value, the message can be dropped (- treated as a duplicate message) or
processed.
At this early stage, the traffic messages from peer are likely to be
NAME_DISTRIBUTORs, this means some name table entries will be missed on
the node forever!
The commit resolves the issue by starting the FAILOVER process on this
node as well. Another benefit from this solution is that we ensure the
link will not be re-established until the failover ends.
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
155 lines
6.6 KiB
C
155 lines
6.6 KiB
C
/*
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* net/tipc/link.h: Include file for TIPC link code
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*
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* Copyright (c) 1995-2006, 2013-2014, Ericsson AB
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* Copyright (c) 2004-2005, 2010-2011, 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_LINK_H
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#define _TIPC_LINK_H
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#include <net/genetlink.h>
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#include "msg.h"
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#include "node.h"
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/* TIPC-specific error codes
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*/
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#define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
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/* Link FSM events:
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*/
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enum {
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LINK_ESTABLISH_EVT = 0xec1ab1e,
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LINK_PEER_RESET_EVT = 0x9eed0e,
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LINK_FAILURE_EVT = 0xfa110e,
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LINK_RESET_EVT = 0x10ca1d0e,
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LINK_FAILOVER_BEGIN_EVT = 0xfa110bee,
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LINK_FAILOVER_END_EVT = 0xfa110ede,
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LINK_SYNCH_BEGIN_EVT = 0xc1ccbee,
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LINK_SYNCH_END_EVT = 0xc1ccede
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};
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/* Events returned from link at packet reception or at timeout
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*/
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enum {
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TIPC_LINK_UP_EVT = 1,
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TIPC_LINK_DOWN_EVT = (1 << 1),
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TIPC_LINK_SND_STATE = (1 << 2)
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};
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/* Starting value for maximum packet size negotiation on unicast links
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* (unless bearer MTU is less)
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*/
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#define MAX_PKT_DEFAULT 1500
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bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
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int tolerance, char net_plane, u32 mtu, int priority,
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int window, u32 session, u32 ownnode,
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u32 peer, u8 *peer_id, u16 peer_caps,
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struct tipc_link *bc_sndlink,
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struct tipc_link *bc_rcvlink,
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struct sk_buff_head *inputq,
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struct sk_buff_head *namedq,
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struct tipc_link **link);
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bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
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int mtu, int window, u16 peer_caps,
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struct sk_buff_head *inputq,
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struct sk_buff_head *namedq,
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struct tipc_link *bc_sndlink,
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struct tipc_link **link);
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void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
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int mtyp, struct sk_buff_head *xmitq);
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void tipc_link_create_dummy_tnl_msg(struct tipc_link *tnl,
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struct sk_buff_head *xmitq);
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void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl,
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struct sk_buff_head *xmitq);
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void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
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int tipc_link_fsm_evt(struct tipc_link *l, int evt);
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bool tipc_link_is_up(struct tipc_link *l);
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bool tipc_link_peer_is_down(struct tipc_link *l);
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bool tipc_link_is_reset(struct tipc_link *l);
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bool tipc_link_is_establishing(struct tipc_link *l);
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bool tipc_link_is_synching(struct tipc_link *l);
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bool tipc_link_is_failingover(struct tipc_link *l);
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bool tipc_link_is_blocked(struct tipc_link *l);
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void tipc_link_set_active(struct tipc_link *l, bool active);
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void tipc_link_reset(struct tipc_link *l);
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void tipc_link_reset_stats(struct tipc_link *l);
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int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list,
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struct sk_buff_head *xmitq);
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struct sk_buff_head *tipc_link_inputq(struct tipc_link *l);
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u16 tipc_link_rcv_nxt(struct tipc_link *l);
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u16 tipc_link_acked(struct tipc_link *l);
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u32 tipc_link_id(struct tipc_link *l);
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char *tipc_link_name(struct tipc_link *l);
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char *tipc_link_name_ext(struct tipc_link *l, char *buf);
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u32 tipc_link_state(struct tipc_link *l);
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char tipc_link_plane(struct tipc_link *l);
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int tipc_link_prio(struct tipc_link *l);
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int tipc_link_window(struct tipc_link *l);
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void tipc_link_update_caps(struct tipc_link *l, u16 capabilities);
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bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr);
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unsigned long tipc_link_tolerance(struct tipc_link *l);
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void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
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struct sk_buff_head *xmitq);
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void tipc_link_set_prio(struct tipc_link *l, u32 prio,
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struct sk_buff_head *xmitq);
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void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit);
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void tipc_link_set_queue_limits(struct tipc_link *l, u32 window);
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int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
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struct tipc_link *link, int nlflags);
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int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
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int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);
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int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
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struct sk_buff_head *xmitq);
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int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
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void tipc_link_add_bc_peer(struct tipc_link *snd_l,
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struct tipc_link *uc_l,
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struct sk_buff_head *xmitq);
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void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
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struct tipc_link *rcv_l,
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struct sk_buff_head *xmitq);
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int tipc_link_bc_peers(struct tipc_link *l);
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void tipc_link_set_mtu(struct tipc_link *l, int mtu);
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int tipc_link_mtu(struct tipc_link *l);
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void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
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struct sk_buff_head *xmitq);
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void tipc_link_build_bc_sync_msg(struct tipc_link *l,
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struct sk_buff_head *xmitq);
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void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr);
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int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
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struct sk_buff_head *xmitq);
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int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
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struct sk_buff_head *xmitq);
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bool tipc_link_too_silent(struct tipc_link *l);
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#endif
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