0c3f6f6554
To avoid hundreds of checks for the different process on I-DATA chunk, struct sctp_stream_interleave is defined as a group of functions used to replace the codes in some place where it needs to do different job according to if the asoc intl_enabled is set. With these ops, it only needs to initialize asoc->stream.si with sctp_stream_interleave_0 for normal data if asoc intl_enable is 0, or sctp_stream_interleave_1 for idata if asoc intl_enable is set in sctp_stream_init. After that, the members in asoc->stream.si can be used directly in some special places without checking asoc intl_enable. make_datafrag is the first member for sctp_stream_interleave, it's used to make data or idata frags, called in sctp_datamsg_from_user. The old function sctp_make_datafrag_empty needs to be adjust some to fit in this ops. Note that as idata and data chunks have different length, it also defines data_chunk_len for sctp_stream_interleave to describe the chunk size. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* SCTP kernel implementation
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* (C) Copyright Red Hat Inc. 2017
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*
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* This file is part of the SCTP kernel implementation
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*
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* These functions manipulate sctp stream queue/scheduling.
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Please send any bug reports or fixes you make to the
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* email addresched(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Xin Long <lucien.xin@gmail.com>
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*/
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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#include <linux/sctp.h>
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static struct sctp_chunk *sctp_make_idatafrag_empty(
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const struct sctp_association *asoc,
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const struct sctp_sndrcvinfo *sinfo,
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int len, __u8 flags, gfp_t gfp)
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{
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struct sctp_chunk *retval;
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struct sctp_idatahdr dp;
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memset(&dp, 0, sizeof(dp));
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dp.stream = htons(sinfo->sinfo_stream);
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if (sinfo->sinfo_flags & SCTP_UNORDERED)
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flags |= SCTP_DATA_UNORDERED;
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retval = sctp_make_idata(asoc, flags, sizeof(dp) + len, gfp);
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if (!retval)
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return NULL;
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retval->subh.idata_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
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memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
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return retval;
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}
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static struct sctp_stream_interleave sctp_stream_interleave_0 = {
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.data_chunk_len = sizeof(struct sctp_data_chunk),
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/* DATA process functions */
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.make_datafrag = sctp_make_datafrag_empty,
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};
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static struct sctp_stream_interleave sctp_stream_interleave_1 = {
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.data_chunk_len = sizeof(struct sctp_idata_chunk),
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/* I-DATA process functions */
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.make_datafrag = sctp_make_idatafrag_empty,
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};
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void sctp_stream_interleave_init(struct sctp_stream *stream)
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{
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struct sctp_association *asoc;
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asoc = container_of(stream, struct sctp_association, stream);
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stream->si = asoc->intl_enable ? &sctp_stream_interleave_1
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: &sctp_stream_interleave_0;
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}
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