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TOMOYO Linux Cross Reference
Linux/net/tipc/subscr.c

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  1 /*
  2  * net/tipc/subscr.c: TIPC network topology service
  3  *
  4  * Copyright (c) 2000-2017, Ericsson AB
  5  * Copyright (c) 2005-2007, 2010-2013, Wind River Systems
  6  * All rights reserved.
  7  *
  8  * Redistribution and use in source and binary forms, with or without
  9  * modification, are permitted provided that the following conditions are met:
 10  *
 11  * 1. Redistributions of source code must retain the above copyright
 12  *    notice, this list of conditions and the following disclaimer.
 13  * 2. Redistributions in binary form must reproduce the above copyright
 14  *    notice, this list of conditions and the following disclaimer in the
 15  *    documentation and/or other materials provided with the distribution.
 16  * 3. Neither the names of the copyright holders nor the names of its
 17  *    contributors may be used to endorse or promote products derived from
 18  *    this software without specific prior written permission.
 19  *
 20  * Alternatively, this software may be distributed under the terms of the
 21  * GNU General Public License ("GPL") version 2 as published by the Free
 22  * Software Foundation.
 23  *
 24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 34  * POSSIBILITY OF SUCH DAMAGE.
 35  */
 36 
 37 #include "core.h"
 38 #include "name_table.h"
 39 #include "subscr.h"
 40 
 41 static void tipc_sub_send_event(struct tipc_subscription *sub,
 42                                 u32 found_lower, u32 found_upper,
 43                                 u32 event, u32 port, u32 node)
 44 {
 45         struct tipc_event *evt = &sub->evt;
 46 
 47         if (sub->inactive)
 48                 return;
 49         tipc_evt_write(evt, event, event);
 50         tipc_evt_write(evt, found_lower, found_lower);
 51         tipc_evt_write(evt, found_upper, found_upper);
 52         tipc_evt_write(evt, port.ref, port);
 53         tipc_evt_write(evt, port.node, node);
 54         tipc_topsrv_queue_evt(sub->net, sub->conid, event, evt);
 55 }
 56 
 57 /**
 58  * tipc_sub_check_overlap - test for subscription overlap with the
 59  * given values
 60  *
 61  * Returns 1 if there is overlap, otherwise 0.
 62  */
 63 int tipc_sub_check_overlap(struct tipc_name_seq *seq, u32 found_lower,
 64                            u32 found_upper)
 65 {
 66         if (found_lower < seq->lower)
 67                 found_lower = seq->lower;
 68         if (found_upper > seq->upper)
 69                 found_upper = seq->upper;
 70         if (found_lower > found_upper)
 71                 return 0;
 72         return 1;
 73 }
 74 
 75 void tipc_sub_report_overlap(struct tipc_subscription *sub,
 76                              u32 found_lower, u32 found_upper,
 77                              u32 event, u32 port, u32 node,
 78                              u32 scope, int must)
 79 {
 80         struct tipc_subscr *s = &sub->evt.s;
 81         u32 filter = tipc_sub_read(s, filter);
 82         struct tipc_name_seq seq;
 83 
 84         seq.type = tipc_sub_read(s, seq.type);
 85         seq.lower = tipc_sub_read(s, seq.lower);
 86         seq.upper = tipc_sub_read(s, seq.upper);
 87 
 88         if (!tipc_sub_check_overlap(&seq, found_lower, found_upper))
 89                 return;
 90 
 91         if (!must && !(filter & TIPC_SUB_PORTS))
 92                 return;
 93         if (filter & TIPC_SUB_CLUSTER_SCOPE && scope == TIPC_NODE_SCOPE)
 94                 return;
 95         if (filter & TIPC_SUB_NODE_SCOPE && scope != TIPC_NODE_SCOPE)
 96                 return;
 97         spin_lock(&sub->lock);
 98         tipc_sub_send_event(sub, found_lower, found_upper,
 99                             event, port, node);
100         spin_unlock(&sub->lock);
101 }
102 
103 static void tipc_sub_timeout(struct timer_list *t)
104 {
105         struct tipc_subscription *sub = from_timer(sub, t, timer);
106         struct tipc_subscr *s = &sub->evt.s;
107 
108         spin_lock(&sub->lock);
109         tipc_sub_send_event(sub, s->seq.lower, s->seq.upper,
110                             TIPC_SUBSCR_TIMEOUT, 0, 0);
111         sub->inactive = true;
112         spin_unlock(&sub->lock);
113 }
114 
115 static void tipc_sub_kref_release(struct kref *kref)
116 {
117         kfree(container_of(kref, struct tipc_subscription, kref));
118 }
119 
120 void tipc_sub_put(struct tipc_subscription *subscription)
121 {
122         kref_put(&subscription->kref, tipc_sub_kref_release);
123 }
124 
125 void tipc_sub_get(struct tipc_subscription *subscription)
126 {
127         kref_get(&subscription->kref);
128 }
129 
130 struct tipc_subscription *tipc_sub_subscribe(struct net *net,
131                                              struct tipc_subscr *s,
132                                              int conid)
133 {
134         u32 filter = tipc_sub_read(s, filter);
135         struct tipc_subscription *sub;
136         u32 timeout;
137 
138         if ((filter & TIPC_SUB_PORTS && filter & TIPC_SUB_SERVICE) ||
139             (tipc_sub_read(s, seq.lower) > tipc_sub_read(s, seq.upper))) {
140                 pr_warn("Subscription rejected, illegal request\n");
141                 return NULL;
142         }
143         sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
144         if (!sub) {
145                 pr_warn("Subscription rejected, no memory\n");
146                 return NULL;
147         }
148         INIT_LIST_HEAD(&sub->service_list);
149         INIT_LIST_HEAD(&sub->sub_list);
150         sub->net = net;
151         sub->conid = conid;
152         sub->inactive = false;
153         memcpy(&sub->evt.s, s, sizeof(*s));
154         spin_lock_init(&sub->lock);
155         kref_init(&sub->kref);
156         if (!tipc_nametbl_subscribe(sub)) {
157                 kfree(sub);
158                 return NULL;
159         }
160         timer_setup(&sub->timer, tipc_sub_timeout, 0);
161         timeout = tipc_sub_read(&sub->evt.s, timeout);
162         if (timeout != TIPC_WAIT_FOREVER)
163                 mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout));
164         return sub;
165 }
166 
167 void tipc_sub_unsubscribe(struct tipc_subscription *sub)
168 {
169         tipc_nametbl_unsubscribe(sub);
170         if (sub->evt.s.timeout != TIPC_WAIT_FOREVER)
171                 del_timer_sync(&sub->timer);
172         list_del(&sub->sub_list);
173         tipc_sub_put(sub);
174 }
175 

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