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Commit b444153f authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: add support for generating add stream change event notification 



This patch is to add Stream Change Event described in rfc6525
section 6.1.3.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 692787ce

include/net/sctp/ulpevent.h

+4 −0
Original line number Diff line number Diff line
@@ -136,6 +136,10 @@ struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event( 
	const struct sctp_association *asoc, __u16 flags,

	 __u32 local_tsn, __u32 remote_tsn, gfp_t gfp);



struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event(

	const struct sctp_association *asoc, __u16 flags,

	__u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp);



void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,

				   struct msghdr *);

void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,

include/uapi/linux/sctp.h

+15 −0
Original line number Diff line number Diff line
@@ -513,6 +513,17 @@ struct sctp_assoc_reset_event { 
	__u32 assocreset_remote_tsn;

};



#define SCTP_ASSOC_CHANGE_DENIED	0x0004

#define SCTP_ASSOC_CHANGE_FAILED	0x0008

struct sctp_stream_change_event {

	__u16 strchange_type;

	__u16 strchange_flags;

	__u32 strchange_length;

	sctp_assoc_t strchange_assoc_id;

	__u16 strchange_instrms;

	__u16 strchange_outstrms;

};



/*

 * Described in Section 7.3

 *   Ancillary Data and Notification Interest Options
@@ -530,6 +541,7 @@ struct sctp_event_subscribe { 
	__u8 sctp_sender_dry_event;

	__u8 sctp_stream_reset_event;

	__u8 sctp_assoc_reset_event;

	__u8 sctp_stream_change_event;

};



/*
@@ -556,6 +568,7 @@ union sctp_notification { 
	struct sctp_sender_dry_event sn_sender_dry_event;

	struct sctp_stream_reset_event sn_strreset_event;

	struct sctp_assoc_reset_event sn_assocreset_event;

	struct sctp_stream_change_event sn_strchange_event;

};



/* Section 5.3.1
@@ -587,6 +600,8 @@ enum sctp_sn_type { 
#define SCTP_STREAM_RESET_EVENT		SCTP_STREAM_RESET_EVENT

	SCTP_ASSOC_RESET_EVENT,

#define SCTP_ASSOC_RESET_EVENT		SCTP_ASSOC_RESET_EVENT

	SCTP_STREAM_CHANGE_EVENT,

#define SCTP_STREAM_CHANGE_EVENT	SCTP_STREAM_CHANGE_EVENT

};



/* Notification error codes used to fill up the error fields in some

net/sctp/ulpevent.c

+28 −0
Original line number Diff line number Diff line
@@ -911,6 +911,34 @@ struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event( 
	return event;

}



struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event(

	const struct sctp_association *asoc, __u16 flags,

	__u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp)

{

	struct sctp_stream_change_event *schange;

	struct sctp_ulpevent *event;

	struct sk_buff *skb;



	event = sctp_ulpevent_new(sizeof(struct sctp_stream_change_event),

				  MSG_NOTIFICATION, gfp);

	if (!event)

		return NULL;



	skb = sctp_event2skb(event);

	schange = (struct sctp_stream_change_event *)

		skb_put(skb, sizeof(struct sctp_stream_change_event));



	schange->strchange_type = SCTP_STREAM_CHANGE_EVENT;

	schange->strchange_flags = flags;

	schange->strchange_length = sizeof(struct sctp_stream_change_event);

	sctp_ulpevent_set_owner(event, asoc);

	schange->strchange_assoc_id = sctp_assoc2id(asoc);

	schange->strchange_instrms = strchange_instrms;

	schange->strchange_outstrms = strchange_outstrms;



	return event;

}



/* Return the notification type, assuming this is a notification

 * event.

 */