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Index: sys/netinet/dccp.h
===================================================================
--- /dev/null
+++ sys/netinet/dccp.h
@@ -0,0 +1,78 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Tom Jones <thj@freebsd.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+#ifndef _NETINET_DCCP_H_
+#define _NETINET_DCCP_H_
+
+__FBSDID("$FreeBSD$");
+
+/* DCCP protocol header as per RFC4340 */
+struct dccphdr {
+ uint16_t d_sport;
+ uint16_t d_dport;
+ uint8_t d_doff;
+#if BYTE_ORDER == LITTLE_ENDIAN
+ uint8_t d_cscov:4,
+ d_ccval:4;
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+ uint8_t d_ccval:4,
+ d_cscov:4;
+#endif
+ uint8_t d_cksum[2];
+#if BYTE_ORDER == LITTLE_ENDIAN
+ uint8_t d_res:3,
+ d_type:4,
+ d_x:1;
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+ uint8_t d_x:1,
+ d_type:4,
+ d_res:3;
+#endif
+ /*
+ * Provide enough space for both the short (24 bit) sequence number and
+ * the long (48 bit) sequene number and a leading reserved byte in
+ * front of the long sequence number.
+ */
+ union dccp_seqno {
+ uint8_t shortseq[3];
+ struct dccp_long_seqno {
+ uint8_t res;
+ uint8_t seq[6];
+ } longseq;
+ } d_seqno;
+};
+
+#define d_seqno_short d_seqno.shortseq;
+#define d_seqno_long d_seqno.longseq.seq;
+
+#define DCCP_SHORTHDR 12
+#define DCCP_LONGHDR 16
+#define DCCP_EXTHDR 0x80
+
+#endif /* _NETINET_DCCP_H */

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