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/*
* net/tipc/subscr.h: Include file for TIPC network topology service
*
* Copyright (c) 2003-2017, Ericsson AB
* Copyright (c) 2005-2007, 2012-2013, Wind River Systems
* Copyright (c) 2020-2021, Red Hat Inc
* 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_SUBSCR_H
#define _TIPC_SUBSCR_H
#include "topsrv.h"
#define TIPC_MAX_SUBSCR 65535
#define TIPC_MAX_PUBL 65535
struct publication;
struct tipc_subscription;
struct tipc_conn;
/**
* struct tipc_subscription - TIPC network topology subscription object
* @s: host-endian copy of the user subscription
* @evt: template for events generated by subscription
* @kref: reference count for this subscription
* @net: network namespace associated with subscription
* @timer: timer governing subscription duration (optional)
* @service_list: adjacent subscriptions in name sequence's subscription list
* @sub_list: adjacent subscriptions in subscriber's subscription list
* @conid: connection identifier of topology server
* @inactive: true if this subscription is inactive
* @lock: serialize up/down and timer events
*/
struct tipc_subscription {
struct tipc_subscr s;
struct tipc_event evt;
struct kref kref;
struct net *net;
struct timer_list timer;
struct list_head service_list;
struct list_head sub_list;
int conid;
bool inactive;
spinlock_t lock;
};
struct tipc_subscription *tipc_sub_subscribe(struct net *net,
struct tipc_subscr *s,
int conid);
void tipc_sub_unsubscribe(struct tipc_subscription *sub);
void tipc_sub_report_overlap(struct tipc_subscription *sub,
struct publication *p,
u32 event, bool must);
int __net_init tipc_topsrv_init_net(struct net *net);
void __net_exit tipc_topsrv_exit_net(struct net *net);
void tipc_sub_put(struct tipc_subscription *subscription);
void tipc_sub_get(struct tipc_subscription *subscription);
#define TIPC_FILTER_MASK (TIPC_SUB_PORTS | TIPC_SUB_SERVICE | TIPC_SUB_CANCEL)
/* tipc_sub_read - return field_ of struct sub_ in host endian format
*/
#define tipc_sub_read(sub_, field_) \
({ \
struct tipc_subscr *sub__ = sub_; \
u32 val__ = (sub__)->field_; \
int swap_ = !((sub__)->filter & TIPC_FILTER_MASK); \
(swap_ ? swab32(val__) : val__); \
})
/* tipc_sub_write - write val_ to field_ of struct sub_ in user endian format
*/
#define tipc_sub_write(sub_, field_, val_) \
({ \
struct tipc_subscr *sub__ = sub_; \
u32 val__ = val_; \
int swap_ = !((sub__)->filter & TIPC_FILTER_MASK); \
(sub__)->field_ = swap_ ? swab32(val__) : val__; \
})
/* tipc_evt_write - write val_ to field_ of struct evt_ in user endian format
*/
#define tipc_evt_write(evt_, field_, val_) \
({ \
struct tipc_event *evt__ = evt_; \
u32 val__ = val_; \
int swap_ = !((evt__)->s.filter & (TIPC_FILTER_MASK)); \
(evt__)->field_ = swap_ ? swab32(val__) : val__; \
})
#endif
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