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: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
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@ -206,6 +206,7 @@ enum sctp_sinfo_flags {
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SCTP_UNORDERED = 1, /* Send/receive message unordered. */
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SCTP_ADDR_OVER = 2, /* Override the primary destination. */
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SCTP_ABORT=4, /* Send an ABORT message to the peer. */
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SCTP_SACK_IMMEDIATELY = 8, /* SACK should be sent without delay */
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SCTP_EOF=MSG_FIN, /* Initiate graceful shutdown process. */
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};
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@ -263,9 +263,18 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
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if (0 == i)
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frag |= SCTP_DATA_FIRST_FRAG;
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if ((i == (whole - 1)) && !over)
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if ((i == (whole - 1)) && !over) {
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frag |= SCTP_DATA_LAST_FRAG;
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/* The application requests to set the I-bit of the
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* last DATA chunk of a user message when providing
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* the user message to the SCTP implementation.
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*/
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if ((sinfo->sinfo_flags & SCTP_EOF) ||
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(sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
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frag |= SCTP_DATA_SACK_IMM;
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}
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chunk = sctp_make_datafrag_empty(asoc, sinfo, len, frag, 0);
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if (!chunk)
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@ -297,6 +306,10 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
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else
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frag = SCTP_DATA_LAST_FRAG;
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if ((sinfo->sinfo_flags & SCTP_EOF) ||
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(sinfo->sinfo_flags & SCTP_SACK_IMMEDIATELY))
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frag |= SCTP_DATA_SACK_IMM;
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chunk = sctp_make_datafrag_empty(asoc, sinfo, over, frag, 0);
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if (!chunk)
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@ -1011,6 +1011,13 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout)
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break;
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case SCTP_XMIT_OK:
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/* The sender is in the SHUTDOWN-PENDING state,
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* The sender MAY set the I-bit in the DATA
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* chunk header.
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*/
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if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING)
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chunk->chunk_hdr->flags |= SCTP_DATA_SACK_IMM;
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break;
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default:
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