forked from Minki/linux
2f487712b8
We need a mechanism guaranteeing that group unicasts sent out from a socket are not bypassed by later sent broadcasts from the same socket. We do this as follows: - Each time a unicast is sent, we set a the broadcast method for the socket to "replicast" and "mandatory". This forces the first subsequent broadcast message to follow the same network and data path as the preceding unicast to a destination, hence preventing it from overtaking the latter. - In order to make the 'same data path' statement above true, we let group unicasts pass through the multicast link input queue, instead of as previously through the unicast link input queue. - In the first broadcast following a unicast, we set a new header flag, requiring all recipients to immediately acknowledge its reception. - During the period before all the expected acknowledges are received, the socket refuses to accept any more broadcast attempts, i.e., by blocking or returning EAGAIN. This period should typically not be longer than a few microseconds. - When all acknowledges have been received, the sending socket will open up for subsequent broadcasts, this time giving the link layer freedom to itself select the best transmission method. - The forced and/or abrupt transmission method changes described above may lead to broadcasts arriving out of order to the recipients. We remedy this by introducing code that checks and if necessary re-orders such messages at the receiving end. 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>
74 lines
3.3 KiB
C
74 lines
3.3 KiB
C
/*
|
|
* net/tipc/group.h: Include file for TIPC group unicast/multicast functions
|
|
*
|
|
* Copyright (c) 2017, Ericsson AB
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _TIPC_GROUP_H
|
|
#define _TIPC_GROUP_H
|
|
|
|
#include "core.h"
|
|
|
|
struct tipc_group;
|
|
struct tipc_member;
|
|
struct tipc_msg;
|
|
|
|
struct tipc_group *tipc_group_create(struct net *net, u32 portid,
|
|
struct tipc_group_req *mreq);
|
|
void tipc_group_delete(struct net *net, struct tipc_group *grp);
|
|
void tipc_group_add_member(struct tipc_group *grp, u32 node, u32 port);
|
|
struct tipc_nlist *tipc_group_dests(struct tipc_group *grp);
|
|
void tipc_group_self(struct tipc_group *grp, struct tipc_name_seq *seq,
|
|
int *scope);
|
|
u32 tipc_group_exclude(struct tipc_group *grp);
|
|
void tipc_group_filter_msg(struct tipc_group *grp,
|
|
struct sk_buff_head *inputq,
|
|
struct sk_buff_head *xmitq);
|
|
void tipc_group_member_evt(struct tipc_group *grp, bool *wakeup,
|
|
int *sk_rcvbuf, struct sk_buff *skb,
|
|
struct sk_buff_head *inputq,
|
|
struct sk_buff_head *xmitq);
|
|
void tipc_group_proto_rcv(struct tipc_group *grp, bool *wakeup,
|
|
struct tipc_msg *hdr,
|
|
struct sk_buff_head *inputq,
|
|
struct sk_buff_head *xmitq);
|
|
void tipc_group_update_bc_members(struct tipc_group *grp, int len, bool ack);
|
|
bool tipc_group_cong(struct tipc_group *grp, u32 dnode, u32 dport,
|
|
int len, struct tipc_member **m);
|
|
bool tipc_group_bc_cong(struct tipc_group *grp, int len);
|
|
void tipc_group_update_rcv_win(struct tipc_group *grp, int blks, u32 node,
|
|
u32 port, struct sk_buff_head *xmitq);
|
|
u16 tipc_group_bc_snd_nxt(struct tipc_group *grp);
|
|
void tipc_group_update_member(struct tipc_member *m, int len);
|
|
int tipc_group_size(struct tipc_group *grp);
|
|
#endif
|