sctp: implement event notification SCTP_SENDER_DRY_EVENT
This patch implement event notification SCTP_SENDER_DRY_EVENT.
SCTP Socket API Extensions:
6.1.9. SCTP_SENDER_DRY_EVENT
When the SCTP stack has no more user data to send or retransmit, this
notification is given to the user. Also, at the time when a user app
subscribes to this event, if there is no data to be sent or
retransmit, the stack will immediately send up this notification.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index 62d4a7b..c962c60 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -862,6 +862,34 @@
return NULL;
}
+/*
+ * Socket Extensions for SCTP
+ * 6.3.10. SCTP_SENDER_DRY_EVENT
+ */
+struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
+ const struct sctp_association *asoc, gfp_t gfp)
+{
+ struct sctp_ulpevent *event;
+ struct sctp_sender_dry_event *sdry;
+ struct sk_buff *skb;
+
+ event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
+ MSG_NOTIFICATION, gfp);
+ if (!event)
+ return NULL;
+
+ skb = sctp_event2skb(event);
+ sdry = (struct sctp_sender_dry_event *)
+ skb_put(skb, sizeof(struct sctp_sender_dry_event));
+
+ sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
+ sdry->sender_dry_flags = 0;
+ sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
+ sctp_ulpevent_set_owner(event, asoc);
+ sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
+
+ return event;
+}
/* Return the notification type, assuming this is a notification
* event.