Commit e1cdd553 authored by Wei Yongjun's avatar Wei Yongjun Committed by David S. Miller

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: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ee916fd0
......@@ -165,6 +165,7 @@ sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
sctp_state_fn_t sctp_sf_do_prm_asconf;
/* Prototypes for other event state functions. */
sctp_state_fn_t sctp_sf_do_no_pending_tsn;
sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
sctp_state_fn_t sctp_sf_ignore_other;
......
......@@ -132,6 +132,9 @@ struct sctp_ulpevent *sctp_ulpevent_make_authkey(
const struct sctp_association *asoc, __u16 key_id,
__u32 indication, gfp_t gfp);
struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
const struct sctp_association *asoc, gfp_t gfp);
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
struct msghdr *);
__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
......
......@@ -354,6 +354,20 @@ struct sctp_authkey_event {
enum { SCTP_AUTH_NEWKEY = 0, };
/*
* 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.
*/
struct sctp_sender_dry_event {
__u16 sender_dry_type;
__u16 sender_dry_flags;
__u32 sender_dry_length;
sctp_assoc_t sender_dry_assoc_id;
};
/*
* Described in Section 7.3
......@@ -369,6 +383,7 @@ struct sctp_event_subscribe {
__u8 sctp_partial_delivery_event;
__u8 sctp_adaptation_layer_event;
__u8 sctp_authentication_event;
__u8 sctp_sender_dry_event;
};
/*
......@@ -392,6 +407,7 @@ union sctp_notification {
struct sctp_adaptation_event sn_adaptation_event;
struct sctp_pdapi_event sn_pdapi_event;
struct sctp_authkey_event sn_authkey_event;
struct sctp_sender_dry_event sn_sender_dry_event;
};
/* Section 5.3.1
......@@ -410,6 +426,7 @@ enum sctp_sn_type {
SCTP_ADAPTATION_INDICATION,
SCTP_AUTHENTICATION_EVENT,
#define SCTP_AUTHENTICATION_INDICATION SCTP_AUTHENTICATION_EVENT
SCTP_SENDER_DRY_EVENT,
};
/* Notification error codes used to fill up the error fields in some
......
......@@ -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.
*
......
......@@ -668,7 +668,7 @@ static const sctp_sm_table_entry_t primitive_event_table[SCTP_NUM_PRIMITIVE_TYPE
/* SCTP_STATE_COOKIE_ECHOED */ \
TYPE_SCTP_FUNC(sctp_sf_ignore_other), \
/* SCTP_STATE_ESTABLISHED */ \
TYPE_SCTP_FUNC(sctp_sf_ignore_other), \
TYPE_SCTP_FUNC(sctp_sf_do_no_pending_tsn), \
/* SCTP_STATE_SHUTDOWN_PENDING */ \
TYPE_SCTP_FUNC(sctp_sf_do_9_2_start_shutdown), \
/* SCTP_STATE_SHUTDOWN_SENT */ \
......
......@@ -862,6 +862,34 @@ fail:
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.
......
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