tipc: Add support for customized subscription overlap handling

This patch enables TIPC's topology server code to do customized
overlap detection handling on a per-subscription basis.  (This
capability is needed to support the upcoming introduction of
multi-cluster TIPC networks.)

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

1 files changed, 8 insertions, 0 deletions

diff --git a/net/tipc/subscr.h b/net/tipc/subscr.h
index 93a8e674fac1..d95536832907 100644
--- a/net/tipc/subscr.h
+++ b/net/tipc/subscr.h
@@ -37,11 +37,18 @@
 #ifndef _TIPC_SUBSCR_H
 #define _TIPC_SUBSCR_H
 
+struct subscription;
+
+typedef void (*tipc_subscr_event) (struct subscription *sub,
+                                   u32 found_lower, u32 found_upper,
+                                   u32 event, u32 port_ref, u32 node);
+
 /**
  * struct subscription - TIPC network topology subscription object
  * @seq: name sequence associated with subscription
  * @timeout: duration of subscription (in ms)
  * @filter: event filtering to be done for subscription
+ * @event_cb: routine invoked when a subscription event is detected
  * @evt: template for events generated by subscription
  * @subscription_list: adjacent subscriptions in subscriber's subscription list
  * @nameseq_list: adjacent subscriptions in name sequence's subscription list
@@ -53,6 +60,7 @@ struct subscription {
         struct tipc_name_seq seq;
         u32 timeout;
         u32 filter;
+        tipc_subscr_event event_cb;
         struct tipc_event evt;
         struct list_head subscription_list;
         struct list_head nameseq_list;