sctp: implement event notification SCTP_SENDER_DRY_EVENT

[cascardo/linux.git] / net / sctp / sm_statefuns.c

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 736847e..7f4a4f8 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -5076,6 +5076,30 @@ sctp_disposition_t sctp_sf_ignore_primitive(
  * These are the state functions for the OTHER events.
  ***************************************************************************/
 
+/*
+ * 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.
+ */
+sctp_disposition_t sctp_sf_do_no_pending_tsn(
+       const struct sctp_endpoint *ep,
+       const struct sctp_association *asoc,
+       const sctp_subtype_t type,
+       void *arg,
+       sctp_cmd_seq_t *commands)
+{
+       struct sctp_ulpevent *event;
+
+       event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC);
+       if (!event)
+               return SCTP_DISPOSITION_NOMEM;
+
+       sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event));
+
+       return SCTP_DISPOSITION_CONSUME;
+}
+
 /*
  * Start the shutdown negotiation.
  *