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668c9beb90
assign_number is added as a member of sctp_stream_interleave, used to assign ssn for data or mid (message id) for idata, called in sctp_packet_append_data. sctp_chunk_assign_ssn is left as it is, and sctp_chunk_assign_mid is added for sctp_stream_interleave_1. This procedure is described in section 2.2.2 of RFC8260. All sizeof(struct sctp_data_chunk) in tx path is replaced with sctp_datachk_len, to make it right for idata as well. And also adjust sctp_chunk_is_data for SCTP_CID_I_DATA. After this patch, idata can be built and sent in tx path. Note that if sp strm_interleave is set, it has to wait_connect in sctp_sendmsg, as asoc intl_enable need to be known after 4 shake- hands, to decide if it should use data or idata later. data and idata can't be mixed to send in one asoc. 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>
117 lines
3.3 KiB
C
117 lines
3.3 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 void sctp_chunk_assign_mid(struct sctp_chunk *chunk)
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{
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struct sctp_stream *stream;
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struct sctp_chunk *lchunk;
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__u32 cfsn = 0;
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__u16 sid;
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if (chunk->has_mid)
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return;
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sid = sctp_chunk_stream_no(chunk);
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stream = &chunk->asoc->stream;
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list_for_each_entry(lchunk, &chunk->msg->chunks, frag_list) {
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struct sctp_idatahdr *hdr;
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lchunk->has_mid = 1;
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if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
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continue;
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hdr = lchunk->subh.idata_hdr;
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if (lchunk->chunk_hdr->flags & SCTP_DATA_FIRST_FRAG)
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hdr->ppid = lchunk->sinfo.sinfo_ppid;
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else
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hdr->fsn = htonl(cfsn++);
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if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
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hdr->mid = htonl(sctp_mid_next(stream, out, sid));
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else
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hdr->mid = htonl(sctp_mid_peek(stream, out, sid));
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}
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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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.assign_number = sctp_chunk_assign_ssn,
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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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.assign_number = sctp_chunk_assign_mid,
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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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