ae236fb208
Like with any other service, group members' availability can be subscribed for by connecting to be topology server. However, because the events arrive via a different socket than the member socket, there is a real risk that membership events my arrive out of synch with the actual JOIN/LEAVE action. I.e., it is possible to receive the first messages from a new member before the corresponding JOIN event arrives, just as it is possible to receive the last messages from a leaving member after the LEAVE event has already been received. Since each member socket is internally also subscribing for membership events, we now fix this problem by passing those events on to the user via the member socket. We leverage the already present member synch- ronization protocol to guarantee correct message/event order. An event is delivered to the user as an empty message where the two source addresses identify the new/lost member. Furthermore, we set the MSG_OOB bit in the message flags to mark it as an event. If the event is an indication about a member loss we also set the MSG_EOR bit, so it can be distinguished from a member addition event. Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
67 lines
2.9 KiB
C
67 lines
2.9 KiB
C
/*
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* net/tipc/group.h: Include file for TIPC group unicast/multicast functions
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*
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* Copyright (c) 2017, Ericsson AB
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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_GROUP_H
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#define _TIPC_GROUP_H
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#include "core.h"
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struct tipc_group;
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struct tipc_member;
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struct tipc_msg;
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struct tipc_group *tipc_group_create(struct net *net, u32 portid,
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struct tipc_group_req *mreq);
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void tipc_group_delete(struct net *net, struct tipc_group *grp);
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void tipc_group_add_member(struct tipc_group *grp, u32 node, u32 port);
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struct tipc_nlist *tipc_group_dests(struct tipc_group *grp);
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void tipc_group_self(struct tipc_group *grp, struct tipc_name_seq *seq,
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int *scope);
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void tipc_group_filter_msg(struct tipc_group *grp,
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struct sk_buff_head *inputq,
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struct sk_buff_head *xmitq);
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void tipc_group_member_evt(struct tipc_group *grp,
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struct sk_buff *skb,
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struct sk_buff_head *inputq,
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struct sk_buff_head *xmitq);
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void tipc_group_proto_rcv(struct tipc_group *grp,
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struct tipc_msg *hdr,
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struct sk_buff_head *inputq,
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struct sk_buff_head *xmitq);
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void tipc_group_update_bc_members(struct tipc_group *grp);
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u16 tipc_group_bc_snd_nxt(struct tipc_group *grp);
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int tipc_group_size(struct tipc_group *grp);
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#endif
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