[TIPC]: Added subscription cancellation capability

This patch allows a TIPC application to cancel an existing
topology service subscription by re-requesting the subscription
with the TIPC_SUB_CANCEL filter bit set.  (All other bits of
the cancel request must match the original subscription request.)

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Per Liden <per.liden@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/tipc.h b/include/linux/tipc.h
index 243a15f..bea4694 100644 (file)
--- a/include/linux/tipc.h
+++ b/include/linux/tipc.h
@@ -129,6 +129,7 @@ static inline unsigned int tipc_node(__u32 addr)
 
 #define TIPC_SUB_PORTS         0x01    /* filter for port availability */
 #define TIPC_SUB_SERVICE       0x02    /* filter for service availability */
+#define TIPC_SUB_CANCEL         0x04    /* cancel a subscription */
 #if 0
 /* The following filter options are not currently implemented */
 #define TIPC_SUB_NO_BIND_EVTS  0x04    /* filter out "publish" events */

diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index c51600b..7a918f1 100644 (file)
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -155,7 +155,7 @@ void tipc_subscr_report_overlap(struct subscription *sub,
            sub->seq.upper, found_lower, found_upper);
        if (!tipc_subscr_overlap(sub, found_lower, found_upper))
                return;
-       if (!must && (sub->filter != TIPC_SUB_PORTS))
+       if (!must && !(sub->filter & TIPC_SUB_PORTS))
                return;
        subscr_send_event(sub, found_lower, found_upper, event, port_ref, node);
 }
@@ -176,6 +176,13 @@ static void subscr_timeout(struct subscription *sub)
        if (subscriber == NULL)
                return;
 
+       /* Validate timeout (in case subscription is being cancelled) */
+
+       if (sub->timeout == TIPC_WAIT_FOREVER) {
+               tipc_ref_unlock(subscriber_ref);
+               return;
+       }
+
        /* Unlink subscription from name table */
 
        tipc_nametbl_unsubscribe(sub);
@@ -198,6 +205,20 @@ static void subscr_timeout(struct subscription *sub)
        atomic_dec(&topsrv.subscription_count);
 }
 
+/**
+ * subscr_del - delete a subscription within a subscription list
+ *
+ * Called with subscriber locked.
+ */
+
+static void subscr_del(struct subscription *sub)
+{
+       tipc_nametbl_unsubscribe(sub);
+       list_del(&sub->subscription_list);
+       kfree(sub);
+       atomic_dec(&topsrv.subscription_count);
+}
+
 /**
  * subscr_terminate - terminate communication with a subscriber
  * 
@@ -227,12 +248,9 @@ static void subscr_terminate(struct subscriber *subscriber)
                        k_cancel_timer(&sub->timer);
                        k_term_timer(&sub->timer);
                }
-               tipc_nametbl_unsubscribe(sub);
-               list_del(&sub->subscription_list);
-               dbg("Term: Removed sub %u,%u,%u from subscriber %x list\n",
+               dbg("Term: Removing sub %u,%u,%u from subscriber %x list\n",
                    sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber);
-               kfree(sub);
-               atomic_dec(&topsrv.subscription_count);
+               subscr_del(sub);
        }
 
        /* Sever connection to subscriber */
@@ -252,6 +270,49 @@ static void subscr_terminate(struct subscriber *subscriber)
        kfree(subscriber);
 }
 
+/**
+ * subscr_cancel - handle subscription cancellation request
+ *
+ * Called with subscriber locked.  Routine must temporarily release this lock
+ * to enable the subscription timeout routine to finish without deadlocking;
+ * the lock is then reclaimed to allow caller to release it upon return.
+ *
+ * Note that fields of 's' use subscriber's endianness!
+ */
+
+static void subscr_cancel(struct tipc_subscr *s,
+                         struct subscriber *subscriber)
+{
+       struct subscription *sub;
+       struct subscription *sub_temp;
+       int found = 0;
+
+       /* Find first matching subscription, exit if not found */
+
+       list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
+                                subscription_list) {
+               if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
+                       found = 1;
+                       break;
+               }
+       }
+       if (!found)
+               return;
+
+       /* Cancel subscription timer (if used), then delete subscription */
+
+       if (sub->timeout != TIPC_WAIT_FOREVER) {
+               sub->timeout = TIPC_WAIT_FOREVER;
+               spin_unlock_bh(subscriber->lock);
+               k_cancel_timer(&sub->timer);
+               k_term_timer(&sub->timer);
+               spin_lock_bh(subscriber->lock);
+       }
+       dbg("Cancel: removing sub %u,%u,%u from subscriber %x list\n",
+           sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber);
+       subscr_del(sub);
+}
+
 /**
  * subscr_subscribe - create subscription for subscriber
  * 
@@ -263,6 +324,21 @@ static void subscr_subscribe(struct tipc_subscr *s,
 {
        struct subscription *sub;
 
+       /* Determine/update subscriber's endianness */
+
+       if (s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE))
+               subscriber->swap = 0;
+       else
+               subscriber->swap = 1;
+
+       /* Detect & process a subscription cancellation request */
+
+       if (s->filter & htohl(TIPC_SUB_CANCEL, subscriber->swap)) {
+               s->filter &= ~htohl(TIPC_SUB_CANCEL, subscriber->swap);
+               subscr_cancel(s, subscriber);
+               return;
+       }
+
        /* Refuse subscription if global limit exceeded */
 
        if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) {
@@ -281,13 +357,6 @@ static void subscr_subscribe(struct tipc_subscr *s,
                return;
        }
 
-       /* Determine/update subscriber's endianness */
-
-       if ((s->filter == TIPC_SUB_PORTS) || (s->filter == TIPC_SUB_SERVICE))
-               subscriber->swap = 0;
-       else
-               subscriber->swap = 1;
-
        /* Initialize subscription object */
 
        memset(sub, 0, sizeof(*sub));
@@ -296,8 +365,8 @@ static void subscr_subscribe(struct tipc_subscr *s,
        sub->seq.upper = htohl(s->seq.upper, subscriber->swap);
        sub->timeout = htohl(s->timeout, subscriber->swap);
        sub->filter = htohl(s->filter, subscriber->swap);
-       if ((((sub->filter != TIPC_SUB_PORTS) 
-             && (sub->filter != TIPC_SUB_SERVICE)))
+       if ((!(sub->filter & TIPC_SUB_PORTS)
+            == !(sub->filter & TIPC_SUB_SERVICE))
            || (sub->seq.lower > sub->seq.upper)) {
                warn("Subscription rejected, illegal request\n");
                kfree(sub);