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| author | Wei Yongjun <yjwei@cn.fujitsu.com> | 2009-11-23 15:53:56 -0500 |
|---|---|---|
| committer | Vlad Yasevich <vladislav.yasevich@hp.com> | 2009-11-23 15:53:56 -0500 |
| commit | b93d6471748de2ce02cc24774b774deb306a57a8 (patch) | |
| tree | 98c69d791297d3805d00f9d8ce2fa04dfbd63c9a /net/sctp | |
| parent | 6dc7694f9df20f148076d82d00cb3663afb0b000 (diff) | |
| download | linux-b93d6471748de2ce02cc24774b774deb306a57a8.tar.bz2 | |
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>
Diffstat (limited to 'net/sctp')
| -rw-r--r-- | net/sctp/chunk.c | 15 | ||||
| -rw-r--r-- | net/sctp/outqueue.c | 7 |
2 files changed, 21 insertions, 1 deletions
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c index acf7c4d128f7..8e4320040f05 100644 --- a/net/sctp/chunk.c +++ b/net/sctp/chunk.c @@ -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) diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c index c9f20e28521b..5732661c87d3 100644 --- a/net/sctp/outqueue.c +++ b/net/sctp/outqueue.c @@ -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: |