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@ -40,16 +40,21 @@
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/**
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* struct tipc_subscriber - TIPC network topology subscriber
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* @kref: reference counter to tipc_subscription object
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* @conid: connection identifier to server connecting to subscriber
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* @lock: control access to subscriber
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* @subscription_list: list of subscription objects for this subscriber
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* @subscrp_list: list of subscription objects for this subscriber
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*/
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struct tipc_subscriber {
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struct kref kref;
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int conid;
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spinlock_t lock;
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struct list_head subscription_list;
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struct list_head subscrp_list;
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};
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static void tipc_subscrp_delete(struct tipc_subscription *sub);
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static void tipc_subscrb_put(struct tipc_subscriber *subscriber);
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/**
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* htohl - convert value to endianness used by destination
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* @in: value to convert
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@ -62,9 +67,9 @@ static u32 htohl(u32 in, int swap)
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return swap ? swab32(in) : in;
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}
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static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
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u32 found_upper, u32 event, u32 port_ref,
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u32 node)
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static void tipc_subscrp_send_event(struct tipc_subscription *sub,
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u32 found_lower, u32 found_upper,
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u32 event, u32 port_ref, u32 node)
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{
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struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
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struct tipc_subscriber *subscriber = sub->subscriber;
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@ -82,12 +87,13 @@ static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
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}
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/**
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* tipc_subscr_overlap - test for subscription overlap with the given values
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* tipc_subscrp_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_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
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u32 found_upper)
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int tipc_subscrp_check_overlap(struct tipc_subscription *sub, u32 found_lower,
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u32 found_upper)
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{
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if (found_lower < sub->seq.lower)
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found_lower = sub->seq.lower;
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@ -98,138 +104,121 @@ int tipc_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
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return 1;
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}
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/**
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* tipc_subscr_report_overlap - issue event if there is subscription overlap
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*
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* Protected by nameseq.lock in name_table.c
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*/
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void tipc_subscr_report_overlap(struct tipc_subscription *sub, u32 found_lower,
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u32 found_upper, u32 event, u32 port_ref,
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u32 node, int must)
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void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower,
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u32 found_upper, u32 event, u32 port_ref,
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u32 node, int must)
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{
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if (!tipc_subscr_overlap(sub, found_lower, found_upper))
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if (!tipc_subscrp_check_overlap(sub, found_lower, found_upper))
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return;
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if (!must && !(sub->filter & TIPC_SUB_PORTS))
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return;
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subscr_send_event(sub, found_lower, found_upper, event, port_ref, node);
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tipc_subscrp_send_event(sub, found_lower, found_upper, event, port_ref,
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node);
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}
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static void subscr_timeout(unsigned long data)
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static void tipc_subscrp_timeout(unsigned long data)
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{
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struct tipc_subscription *sub = (struct tipc_subscription *)data;
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struct tipc_subscriber *subscriber = sub->subscriber;
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struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
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/* The spin lock per subscriber is used to protect its members */
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spin_lock_bh(&subscriber->lock);
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/* Validate timeout (in case subscription is being cancelled) */
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if (sub->timeout == TIPC_WAIT_FOREVER) {
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spin_unlock_bh(&subscriber->lock);
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return;
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}
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/* Unlink subscription from name table */
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tipc_nametbl_unsubscribe(sub);
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/* Unlink subscription from subscriber */
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list_del(&sub->subscription_list);
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spin_unlock_bh(&subscriber->lock);
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/* Notify subscriber of timeout */
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subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
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TIPC_SUBSCR_TIMEOUT, 0, 0);
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tipc_subscrp_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
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TIPC_SUBSCR_TIMEOUT, 0, 0);
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/* Now destroy subscription */
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kfree(sub);
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atomic_dec(&tn->subscription_count);
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spin_lock_bh(&subscriber->lock);
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tipc_subscrp_delete(sub);
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spin_unlock_bh(&subscriber->lock);
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tipc_subscrb_put(subscriber);
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}
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/**
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* subscr_del - delete a subscription within a subscription list
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*
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* Called with subscriber lock held.
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*/
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static void subscr_del(struct tipc_subscription *sub)
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static void tipc_subscrb_kref_release(struct kref *kref)
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{
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struct tipc_subscriber *subcriber = container_of(kref,
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struct tipc_subscriber, kref);
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kfree(subcriber);
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}
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static void tipc_subscrb_put(struct tipc_subscriber *subscriber)
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{
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kref_put(&subscriber->kref, tipc_subscrb_kref_release);
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}
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static void tipc_subscrb_get(struct tipc_subscriber *subscriber)
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{
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kref_get(&subscriber->kref);
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}
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static struct tipc_subscriber *tipc_subscrb_create(int conid)
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{
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struct tipc_subscriber *subscriber;
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subscriber = kzalloc(sizeof(*subscriber), GFP_ATOMIC);
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if (!subscriber) {
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pr_warn("Subscriber rejected, no memory\n");
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return NULL;
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}
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kref_init(&subscriber->kref);
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INIT_LIST_HEAD(&subscriber->subscrp_list);
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subscriber->conid = conid;
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spin_lock_init(&subscriber->lock);
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return subscriber;
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}
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static void tipc_subscrb_delete(struct tipc_subscriber *subscriber)
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{
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struct tipc_subscription *sub, *temp;
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spin_lock_bh(&subscriber->lock);
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/* Destroy any existing subscriptions for subscriber */
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list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
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subscrp_list) {
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if (del_timer(&sub->timer)) {
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tipc_subscrp_delete(sub);
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tipc_subscrb_put(subscriber);
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}
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}
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spin_unlock_bh(&subscriber->lock);
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tipc_subscrb_put(subscriber);
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}
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static void tipc_subscrp_delete(struct tipc_subscription *sub)
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{
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struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
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tipc_nametbl_unsubscribe(sub);
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list_del(&sub->subscription_list);
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list_del(&sub->subscrp_list);
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kfree(sub);
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atomic_dec(&tn->subscription_count);
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}
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static void subscr_release(struct tipc_subscriber *subscriber)
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static void tipc_subscrp_cancel(struct tipc_subscr *s,
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struct tipc_subscriber *subscriber)
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{
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struct tipc_subscription *sub;
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struct tipc_subscription *sub_temp;
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struct tipc_subscription *sub, *temp;
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spin_lock_bh(&subscriber->lock);
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/* Destroy any existing subscriptions for subscriber */
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list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
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subscription_list) {
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if (sub->timeout != TIPC_WAIT_FOREVER) {
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spin_unlock_bh(&subscriber->lock);
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del_timer_sync(&sub->timer);
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spin_lock_bh(&subscriber->lock);
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}
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subscr_del(sub);
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}
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spin_unlock_bh(&subscriber->lock);
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/* Now destroy subscriber */
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kfree(subscriber);
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}
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/**
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* subscr_cancel - handle subscription cancellation request
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*
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* Called with subscriber lock held. Routine must temporarily release lock
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* to enable the subscription timeout routine to finish without deadlocking;
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* the lock is then reclaimed to allow caller to release it upon return.
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*
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* Note that fields of 's' use subscriber's endianness!
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*/
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static void subscr_cancel(struct tipc_subscr *s,
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struct tipc_subscriber *subscriber)
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{
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struct tipc_subscription *sub;
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struct tipc_subscription *sub_temp;
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int found = 0;
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/* Find first matching subscription, exit if not found */
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list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
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subscription_list) {
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list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
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subscrp_list) {
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if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
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found = 1;
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if (del_timer(&sub->timer)) {
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tipc_subscrp_delete(sub);
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tipc_subscrb_put(subscriber);
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}
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break;
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}
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}
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if (!found)
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return;
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/* Cancel subscription timer (if used), then delete subscription */
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if (sub->timeout != TIPC_WAIT_FOREVER) {
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sub->timeout = TIPC_WAIT_FOREVER;
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spin_unlock_bh(&subscriber->lock);
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del_timer_sync(&sub->timer);
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spin_lock_bh(&subscriber->lock);
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}
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subscr_del(sub);
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spin_unlock_bh(&subscriber->lock);
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}
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/**
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* subscr_subscribe - create subscription for subscriber
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*
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* Called with subscriber lock held.
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*/
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static int subscr_subscribe(struct net *net, struct tipc_subscr *s,
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struct tipc_subscriber *subscriber,
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struct tipc_subscription **sub_p)
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static int tipc_subscrp_create(struct net *net, struct tipc_subscr *s,
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struct tipc_subscriber *subscriber,
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struct tipc_subscription **sub_p)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_subscription *sub;
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@ -241,7 +230,7 @@ static int subscr_subscribe(struct net *net, struct tipc_subscr *s,
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/* Detect & process a subscription cancellation request */
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if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
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s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
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subscr_cancel(s, subscriber);
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tipc_subscrp_cancel(s, subscriber);
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return 0;
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}
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@ -273,62 +262,51 @@ static int subscr_subscribe(struct net *net, struct tipc_subscr *s,
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kfree(sub);
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return -EINVAL;
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}
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list_add(&sub->subscription_list, &subscriber->subscription_list);
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spin_lock_bh(&subscriber->lock);
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list_add(&sub->subscrp_list, &subscriber->subscrp_list);
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spin_unlock_bh(&subscriber->lock);
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sub->subscriber = subscriber;
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sub->swap = swap;
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memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
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memcpy(&sub->evt.s, s, sizeof(*s));
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atomic_inc(&tn->subscription_count);
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if (sub->timeout != TIPC_WAIT_FOREVER) {
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setup_timer(&sub->timer, subscr_timeout, (unsigned long)sub);
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mod_timer(&sub->timer, jiffies + sub->timeout);
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}
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setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub);
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if (sub->timeout != TIPC_WAIT_FOREVER)
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sub->timeout += jiffies;
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if (!mod_timer(&sub->timer, sub->timeout))
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tipc_subscrb_get(subscriber);
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*sub_p = sub;
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return 0;
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}
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/* Handle one termination request for the subscriber */
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static void subscr_conn_shutdown_event(int conid, void *usr_data)
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static void tipc_subscrb_shutdown_cb(int conid, void *usr_data)
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{
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subscr_release((struct tipc_subscriber *)usr_data);
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tipc_subscrb_delete((struct tipc_subscriber *)usr_data);
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}
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/* Handle one request to create a new subscription for the subscriber */
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static void subscr_conn_msg_event(struct net *net, int conid,
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struct sockaddr_tipc *addr, void *usr_data,
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|
void *buf, size_t len)
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static void tipc_subscrb_rcv_cb(struct net *net, int conid,
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|
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struct sockaddr_tipc *addr, void *usr_data,
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|
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|
void *buf, size_t len)
|
|
|
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|
{
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struct tipc_subscriber *subscriber = usr_data;
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|
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struct tipc_subscription *sub = NULL;
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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|
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spin_lock_bh(&subscriber->lock);
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|
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subscr_subscribe(net, (struct tipc_subscr *)buf, subscriber, &sub);
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|
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tipc_subscrp_create(net, (struct tipc_subscr *)buf, subscriber, &sub);
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|
|
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|
if (sub)
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|
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|
tipc_nametbl_subscribe(sub);
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|
|
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else
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|
|
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|
tipc_conn_terminate(tn->topsrv, subscriber->conid);
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|
|
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|
spin_unlock_bh(&subscriber->lock);
|
|
|
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|
}
|
|
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|
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|
|
|
|
|
/* Handle one request to establish a new subscriber */
|
|
|
|
|
static void *subscr_named_msg_event(int conid)
|
|
|
|
|
static void *tipc_subscrb_connect_cb(int conid)
|
|
|
|
|
{
|
|
|
|
|
struct tipc_subscriber *subscriber;
|
|
|
|
|
|
|
|
|
|
/* Create subscriber object */
|
|
|
|
|
subscriber = kzalloc(sizeof(struct tipc_subscriber), GFP_ATOMIC);
|
|
|
|
|
if (subscriber == NULL) {
|
|
|
|
|
pr_warn("Subscriber rejected, no memory\n");
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
INIT_LIST_HEAD(&subscriber->subscription_list);
|
|
|
|
|
subscriber->conid = conid;
|
|
|
|
|
spin_lock_init(&subscriber->lock);
|
|
|
|
|
|
|
|
|
|
return (void *)subscriber;
|
|
|
|
|
return (void *)tipc_subscrb_create(conid);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int tipc_subscr_start(struct net *net)
|
|
|
|
|
int tipc_topsrv_start(struct net *net)
|
|
|
|
|
{
|
|
|
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
|
|
|
const char name[] = "topology_server";
|
|
|
|
@ -355,9 +333,9 @@ int tipc_subscr_start(struct net *net)
|
|
|
|
|
topsrv->imp = TIPC_CRITICAL_IMPORTANCE;
|
|
|
|
|
topsrv->type = SOCK_SEQPACKET;
|
|
|
|
|
topsrv->max_rcvbuf_size = sizeof(struct tipc_subscr);
|
|
|
|
|
topsrv->tipc_conn_recvmsg = subscr_conn_msg_event;
|
|
|
|
|
topsrv->tipc_conn_new = subscr_named_msg_event;
|
|
|
|
|
topsrv->tipc_conn_shutdown = subscr_conn_shutdown_event;
|
|
|
|
|
topsrv->tipc_conn_recvmsg = tipc_subscrb_rcv_cb;
|
|
|
|
|
topsrv->tipc_conn_new = tipc_subscrb_connect_cb;
|
|
|
|
|
topsrv->tipc_conn_shutdown = tipc_subscrb_shutdown_cb;
|
|
|
|
|
|
|
|
|
|
strncpy(topsrv->name, name, strlen(name) + 1);
|
|
|
|
|
tn->topsrv = topsrv;
|
|
|
|
@ -366,7 +344,7 @@ int tipc_subscr_start(struct net *net)
|
|
|
|
|
return tipc_server_start(topsrv);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void tipc_subscr_stop(struct net *net)
|
|
|
|
|
void tipc_topsrv_stop(struct net *net)
|
|
|
|
|
{
|
|
|
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
|
|
|
struct tipc_server *topsrv = tn->topsrv;
|
|
|
|
|