2 * net/tipc/subscr.c: TIPC network topology service
4 * Copyright (c) 2000-2017, Ericsson AB
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39 #include "name_table.h"
42 static void tipc_sub_send_event(struct tipc_subscription *sub,
43 struct publication *p,
46 struct tipc_subscr *s = &sub->evt.s;
47 struct tipc_event *evt = &sub->evt;
51 tipc_evt_write(evt, event, event);
53 tipc_evt_write(evt, found_lower, p->sr.lower);
54 tipc_evt_write(evt, found_upper, p->sr.upper);
55 tipc_evt_write(evt, port.ref, p->sk.ref);
56 tipc_evt_write(evt, port.node, p->sk.node);
58 tipc_evt_write(evt, found_lower, s->seq.lower);
59 tipc_evt_write(evt, found_upper, s->seq.upper);
60 tipc_evt_write(evt, port.ref, 0);
61 tipc_evt_write(evt, port.node, 0);
63 tipc_topsrv_queue_evt(sub->net, sub->conid, event, evt);
67 * tipc_sub_check_overlap - test for subscription overlap with the given values
68 * @subscribed: the service range subscribed for
69 * @found: the service range we are checking for match
71 * Returns true if there is overlap, otherwise false.
73 static bool tipc_sub_check_overlap(struct tipc_service_range *subscribed,
74 struct tipc_service_range *found)
76 u32 found_lower = found->lower;
77 u32 found_upper = found->upper;
79 if (found_lower < subscribed->lower)
80 found_lower = subscribed->lower;
81 if (found_upper > subscribed->upper)
82 found_upper = subscribed->upper;
83 return found_lower <= found_upper;
86 void tipc_sub_report_overlap(struct tipc_subscription *sub,
87 struct publication *p,
90 struct tipc_service_range *sr = &sub->s.seq;
91 u32 filter = sub->s.filter;
93 if (!tipc_sub_check_overlap(sr, &p->sr))
95 if (!must && !(filter & TIPC_SUB_PORTS))
97 if (filter & TIPC_SUB_CLUSTER_SCOPE && p->scope == TIPC_NODE_SCOPE)
99 if (filter & TIPC_SUB_NODE_SCOPE && p->scope != TIPC_NODE_SCOPE)
101 spin_lock(&sub->lock);
102 tipc_sub_send_event(sub, p, event);
103 spin_unlock(&sub->lock);
106 static void tipc_sub_timeout(struct timer_list *t)
108 struct tipc_subscription *sub = from_timer(sub, t, timer);
110 spin_lock(&sub->lock);
111 tipc_sub_send_event(sub, NULL, TIPC_SUBSCR_TIMEOUT);
112 sub->inactive = true;
113 spin_unlock(&sub->lock);
116 static void tipc_sub_kref_release(struct kref *kref)
118 kfree(container_of(kref, struct tipc_subscription, kref));
121 void tipc_sub_put(struct tipc_subscription *subscription)
123 kref_put(&subscription->kref, tipc_sub_kref_release);
126 void tipc_sub_get(struct tipc_subscription *subscription)
128 kref_get(&subscription->kref);
131 struct tipc_subscription *tipc_sub_subscribe(struct net *net,
132 struct tipc_subscr *s,
135 u32 lower = tipc_sub_read(s, seq.lower);
136 u32 upper = tipc_sub_read(s, seq.upper);
137 u32 filter = tipc_sub_read(s, filter);
138 struct tipc_subscription *sub;
141 if ((filter & TIPC_SUB_PORTS && filter & TIPC_SUB_SERVICE) ||
143 pr_warn("Subscription rejected, illegal request\n");
146 sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
148 pr_warn("Subscription rejected, no memory\n");
151 INIT_LIST_HEAD(&sub->service_list);
152 INIT_LIST_HEAD(&sub->sub_list);
155 sub->inactive = false;
156 memcpy(&sub->evt.s, s, sizeof(*s));
157 sub->s.seq.type = tipc_sub_read(s, seq.type);
158 sub->s.seq.lower = lower;
159 sub->s.seq.upper = upper;
160 sub->s.filter = filter;
161 sub->s.timeout = tipc_sub_read(s, timeout);
162 memcpy(sub->s.usr_handle, s->usr_handle, 8);
163 spin_lock_init(&sub->lock);
164 kref_init(&sub->kref);
165 if (!tipc_nametbl_subscribe(sub)) {
169 timer_setup(&sub->timer, tipc_sub_timeout, 0);
170 timeout = tipc_sub_read(&sub->evt.s, timeout);
171 if (timeout != TIPC_WAIT_FOREVER)
172 mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout));
176 void tipc_sub_unsubscribe(struct tipc_subscription *sub)
178 tipc_nametbl_unsubscribe(sub);
179 if (sub->evt.s.timeout != TIPC_WAIT_FOREVER)
180 del_timer_sync(&sub->timer);
181 list_del(&sub->sub_list);