mirror of https://gitee.com/openkylin/linux.git
175 lines
5.4 KiB
C
175 lines
5.4 KiB
C
/*
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* net/tipc/subscr.c: TIPC network topology service
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*
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* Copyright (c) 2000-2017, Ericsson AB
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* Copyright (c) 2005-2007, 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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#include "core.h"
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#include "name_table.h"
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#include "subscr.h"
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static void tipc_sub_send_event(struct tipc_subscription *sub,
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u32 found_lower, u32 found_upper,
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u32 event, u32 port, u32 node)
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{
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struct tipc_event *evt = &sub->evt;
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if (sub->inactive)
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return;
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tipc_evt_write(evt, event, event);
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tipc_evt_write(evt, found_lower, found_lower);
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tipc_evt_write(evt, found_upper, found_upper);
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tipc_evt_write(evt, port.ref, port);
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tipc_evt_write(evt, port.node, node);
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tipc_topsrv_queue_evt(sub->net, sub->conid, event, evt);
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}
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/**
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* tipc_sub_check_overlap - test for subscription overlap with the
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* given values
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*
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* Returns 1 if there is overlap, otherwise 0.
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*/
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int tipc_sub_check_overlap(struct tipc_name_seq *seq, u32 found_lower,
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u32 found_upper)
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{
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if (found_lower < seq->lower)
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found_lower = seq->lower;
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if (found_upper > seq->upper)
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found_upper = seq->upper;
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if (found_lower > found_upper)
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return 0;
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return 1;
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}
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void tipc_sub_report_overlap(struct tipc_subscription *sub,
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u32 found_lower, u32 found_upper,
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u32 event, u32 port, u32 node,
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u32 scope, int must)
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{
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struct tipc_subscr *s = &sub->evt.s;
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u32 filter = tipc_sub_read(s, filter);
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struct tipc_name_seq seq;
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seq.type = tipc_sub_read(s, seq.type);
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seq.lower = tipc_sub_read(s, seq.lower);
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seq.upper = tipc_sub_read(s, seq.upper);
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if (!tipc_sub_check_overlap(&seq, found_lower, found_upper))
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return;
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if (!must && !(filter & TIPC_SUB_PORTS))
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return;
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if (filter & TIPC_SUB_CLUSTER_SCOPE && scope == TIPC_NODE_SCOPE)
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return;
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if (filter & TIPC_SUB_NODE_SCOPE && scope != TIPC_NODE_SCOPE)
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return;
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spin_lock(&sub->lock);
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tipc_sub_send_event(sub, found_lower, found_upper,
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event, port, node);
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spin_unlock(&sub->lock);
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}
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static void tipc_sub_timeout(struct timer_list *t)
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{
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struct tipc_subscription *sub = from_timer(sub, t, timer);
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struct tipc_subscr *s = &sub->evt.s;
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spin_lock(&sub->lock);
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tipc_sub_send_event(sub, s->seq.lower, s->seq.upper,
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TIPC_SUBSCR_TIMEOUT, 0, 0);
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sub->inactive = true;
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spin_unlock(&sub->lock);
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}
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static void tipc_sub_kref_release(struct kref *kref)
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{
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kfree(container_of(kref, struct tipc_subscription, kref));
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}
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void tipc_sub_put(struct tipc_subscription *subscription)
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{
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kref_put(&subscription->kref, tipc_sub_kref_release);
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}
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void tipc_sub_get(struct tipc_subscription *subscription)
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{
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kref_get(&subscription->kref);
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}
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struct tipc_subscription *tipc_sub_subscribe(struct net *net,
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struct tipc_subscr *s,
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int conid)
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{
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u32 filter = tipc_sub_read(s, filter);
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struct tipc_subscription *sub;
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u32 timeout;
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if ((filter & TIPC_SUB_PORTS && filter & TIPC_SUB_SERVICE) ||
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(tipc_sub_read(s, seq.lower) > tipc_sub_read(s, seq.upper))) {
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pr_warn("Subscription rejected, illegal request\n");
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return NULL;
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}
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sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
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if (!sub) {
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pr_warn("Subscription rejected, no memory\n");
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return NULL;
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}
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INIT_LIST_HEAD(&sub->service_list);
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INIT_LIST_HEAD(&sub->sub_list);
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sub->net = net;
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sub->conid = conid;
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sub->inactive = false;
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memcpy(&sub->evt.s, s, sizeof(*s));
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spin_lock_init(&sub->lock);
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kref_init(&sub->kref);
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if (!tipc_nametbl_subscribe(sub)) {
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kfree(sub);
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return NULL;
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}
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timer_setup(&sub->timer, tipc_sub_timeout, 0);
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timeout = tipc_sub_read(&sub->evt.s, timeout);
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if (timeout != TIPC_WAIT_FOREVER)
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mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout));
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return sub;
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}
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void tipc_sub_unsubscribe(struct tipc_subscription *sub)
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{
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tipc_nametbl_unsubscribe(sub);
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if (sub->evt.s.timeout != TIPC_WAIT_FOREVER)
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del_timer_sync(&sub->timer);
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list_del(&sub->sub_list);
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tipc_sub_put(sub);
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}
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