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sctp: implement event notification SCTP_SENDER_DRY_EVENT

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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>
This commit is contained in:
Wei Yongjun 2011-04-17 17:29:03 +00:00 • committed by David S. Miller
parent ee916fd0fd
commit e1cdd553d4
6 changed files with 74 additions and 1 deletions
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24
net/sctp/sm_statefuns.c
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@ -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.
*