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>
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@ -165,6 +165,7 @@ sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
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sctp_state_fn_t sctp_sf_do_prm_asconf;
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/* Prototypes for other event state functions. */
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sctp_state_fn_t sctp_sf_do_no_pending_tsn;
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sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
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sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
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sctp_state_fn_t sctp_sf_ignore_other;
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@ -132,6 +132,9 @@ struct sctp_ulpevent *sctp_ulpevent_make_authkey(
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const struct sctp_association *asoc, __u16 key_id,
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__u32 indication, gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
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const struct sctp_association *asoc, gfp_t gfp);
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void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
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struct msghdr *);
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__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
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@ -354,6 +354,20 @@ struct sctp_authkey_event {
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enum { SCTP_AUTH_NEWKEY = 0, };
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/*
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* 6.1.9. SCTP_SENDER_DRY_EVENT
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*
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* When the SCTP stack has no more user data to send or retransmit, this
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* notification is given to the user. Also, at the time when a user app
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* subscribes to this event, if there is no data to be sent or
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* retransmit, the stack will immediately send up this notification.
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*/
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struct sctp_sender_dry_event {
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__u16 sender_dry_type;
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__u16 sender_dry_flags;
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__u32 sender_dry_length;
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sctp_assoc_t sender_dry_assoc_id;
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};
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/*
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* Described in Section 7.3
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@ -369,6 +383,7 @@ struct sctp_event_subscribe {
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__u8 sctp_partial_delivery_event;
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__u8 sctp_adaptation_layer_event;
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__u8 sctp_authentication_event;
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__u8 sctp_sender_dry_event;
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};
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/*
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@ -392,6 +407,7 @@ union sctp_notification {
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struct sctp_adaptation_event sn_adaptation_event;
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struct sctp_pdapi_event sn_pdapi_event;
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struct sctp_authkey_event sn_authkey_event;
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struct sctp_sender_dry_event sn_sender_dry_event;
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};
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/* Section 5.3.1
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@ -410,6 +426,7 @@ enum sctp_sn_type {
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SCTP_ADAPTATION_INDICATION,
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SCTP_AUTHENTICATION_EVENT,
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#define SCTP_AUTHENTICATION_INDICATION SCTP_AUTHENTICATION_EVENT
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SCTP_SENDER_DRY_EVENT,
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};
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/* Notification error codes used to fill up the error fields in some
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@ -5076,6 +5076,30 @@ sctp_disposition_t sctp_sf_ignore_primitive(
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* These are the state functions for the OTHER events.
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***************************************************************************/
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/*
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* When the SCTP stack has no more user data to send or retransmit, this
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* notification is given to the user. Also, at the time when a user app
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* subscribes to this event, if there is no data to be sent or
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* retransmit, the stack will immediately send up this notification.
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*/
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sctp_disposition_t sctp_sf_do_no_pending_tsn(
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const struct sctp_endpoint *ep,
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const struct sctp_association *asoc,
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const sctp_subtype_t type,
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void *arg,
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sctp_cmd_seq_t *commands)
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{
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struct sctp_ulpevent *event;
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event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC);
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if (!event)
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return SCTP_DISPOSITION_NOMEM;
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sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event));
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return SCTP_DISPOSITION_CONSUME;
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}
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/*
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* Start the shutdown negotiation.
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*
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@ -668,7 +668,7 @@ static const sctp_sm_table_entry_t primitive_event_table[SCTP_NUM_PRIMITIVE_TYPE
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/* SCTP_STATE_COOKIE_ECHOED */ \
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TYPE_SCTP_FUNC(sctp_sf_ignore_other), \
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/* SCTP_STATE_ESTABLISHED */ \
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TYPE_SCTP_FUNC(sctp_sf_ignore_other), \
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TYPE_SCTP_FUNC(sctp_sf_do_no_pending_tsn), \
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/* SCTP_STATE_SHUTDOWN_PENDING */ \
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TYPE_SCTP_FUNC(sctp_sf_do_9_2_start_shutdown), \
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/* SCTP_STATE_SHUTDOWN_SENT */ \
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@ -862,6 +862,34 @@ fail:
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return NULL;
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}
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/*
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* Socket Extensions for SCTP
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* 6.3.10. SCTP_SENDER_DRY_EVENT
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*/
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struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
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const struct sctp_association *asoc, gfp_t gfp)
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{
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struct sctp_ulpevent *event;
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struct sctp_sender_dry_event *sdry;
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struct sk_buff *skb;
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event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
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MSG_NOTIFICATION, gfp);
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if (!event)
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return NULL;
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skb = sctp_event2skb(event);
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sdry = (struct sctp_sender_dry_event *)
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skb_put(skb, sizeof(struct sctp_sender_dry_event));
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sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
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sdry->sender_dry_flags = 0;
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sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
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sctp_ulpevent_set_owner(event, asoc);
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sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
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return event;
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}
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/* Return the notification type, assuming this is a notification
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* event.
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