Commit b93d6471 authored by Wei Yongjun's avatar Wei Yongjun Committed by Vlad Yasevich
Browse files

sctp: implement the sender side for SACK-IMMEDIATELY extension 



This patch implement the sender side for SACK-IMMEDIATELY
extension.

  Section 4.1.  Sender Side Considerations

  Whenever the sender of a DATA chunk can benefit from the
  corresponding SACK chunk being sent back without delay, the sender
  MAY set the I-bit in the DATA chunk header.

  Reasons for setting the I-bit include

  o  The sender is in the SHUTDOWN-PENDING state.

  o  The application requests to set the I-bit of the last DATA chunk
     of a user message when providing the user message to the SCTP
     implementation.

Signed-off-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
parent 6dc7694f

include/net/sctp/user.h

+1 −0
Original line number Diff line number Diff line
@@ -206,6 +206,7 @@ enum sctp_sinfo_flags { 
	SCTP_UNORDERED = 1,  /* Send/receive message unordered. */

	SCTP_ADDR_OVER = 2,  /* Override the primary destination. */

	SCTP_ABORT=4,        /* Send an ABORT message to the peer. */

	SCTP_SACK_IMMEDIATELY = 8,	/* SACK should be sent without delay */

	SCTP_EOF=MSG_FIN,    /* Initiate graceful shutdown process. */	

};

net/sctp/chunk.c

+14 −1
Original line number Diff line number Diff line
@@ -263,9 +263,18 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc, 
		if (0 == i)

			frag |= SCTP_DATA_FIRST_FRAG;



		if ((i == (whole - 1)) && !over)

		if ((i == (whole - 1)) && !over) {

			frag |= SCTP_DATA_LAST_FRAG;



			/* The application requests to set the I-bit of the

			 * last DATA chunk of a user message when providing

			 * the user message to the SCTP implementation.

			 */

			if ((sinfo->sinfo_flags & SCTP_EOF) ||

			    (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))

				frag |= SCTP_DATA_SACK_IMM;

		}



		chunk = sctp_make_datafrag_empty(asoc, sinfo, len, frag, 0);



		if (!chunk)
@@ -297,6 +306,10 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc, 
		else

			frag = SCTP_DATA_LAST_FRAG;



		if ((sinfo->sinfo_flags & SCTP_EOF) ||

		    (sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))

			frag |= SCTP_DATA_SACK_IMM;



		chunk = sctp_make_datafrag_empty(asoc, sinfo, over, frag, 0);



		if (!chunk)

net/sctp/outqueue.c

+7 −0
Original line number Diff line number Diff line
@@ -1011,6 +1011,13 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout) 
				break;



			case SCTP_XMIT_OK:

				/* The sender is in the SHUTDOWN-PENDING state,

				 * The sender MAY set the I-bit in the DATA

				 * chunk header.

				 */

				if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING)

					chunk->chunk_hdr->flags |= SCTP_DATA_SACK_IMM;



				break;



			default:

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