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diff --git a/include/net/sctp/stream_interleave.h b/include/net/sctp/stream_interleave.h
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+/* SCTP kernel implementation
+ * (C) Copyright Red Hat Inc. 2017
+ *
+ * These are definitions used by the stream schedulers, defined in RFC
+ * draft ndata (https://tools.ietf.org/html/draft-ietf-tsvwg-sctp-ndata-11)
+ *
+ * This SCTP implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresses:
+ * lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Written or modified by:
+ * Xin Long <lucien.xin@gmail.com>
+ */
+
+#ifndef __sctp_stream_interleave_h__
+#define __sctp_stream_interleave_h__
+
+struct sctp_stream_interleave {
+ __u16 data_chunk_len;
+ /* (I-)DATA process */
+ struct sctp_chunk *(*make_datafrag)(const struct sctp_association *asoc,
+ const struct sctp_sndrcvinfo *sinfo,
+ int len, __u8 flags, gfp_t gfp);
+};
+
+void sctp_stream_interleave_init(struct sctp_stream *stream);
+
+#endif /* __sctp_stream_interleave_h__ */