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diff --git a/sys/compat/linuxkpi/common/include/linux/ip.h b/sys/compat/linuxkpi/common/include/linux/ip.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/ip.h
@@ -0,0 +1,74 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020-2021 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef __LKPI_LINUX_IP_H
+#define __LKPI_LINUX_IP_H
+
+#include <sys/types.h>
+
+#include <netinet/ip.h>
+#include <machine/in_cksum.h>
+
+#include <linux/skbuff.h>
+
+/* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */
+struct iphdr {
+ uint8_t ip_hl:4, ip_ver:4; /* (u) */
+ uint8_t ip_tos; /* (u) */
+ uint16_t ip_len; /* (u) */
+ uint16_t id;
+ uint16_t ip_off; /* (u) */
+ uint8_t ip_ttl; /* (u) */
+ uint8_t protocol;
+ uint16_t check;
+ uint32_t saddr;
+ uint32_t daddr;
+};
+
+static __inline struct iphdr *
+ip_hdr(struct sk_buff *skb)
+{
+
+ return (struct iphdr *)skb_network_header(skb);
+}
+
+static __inline void
+ip_send_check(struct iphdr *iph)
+{
+
+ /* Clear the checksum before computing! */
+ iph->check = 0;
+ /* An IPv4 header is the same everywhere even if names differ. */
+ iph->check = in_cksum_hdr((const void *)iph);
+}
+
+#endif /* __LKPI_LINUX_IP_H */
diff --git a/sys/compat/linuxkpi/common/include/linux/tcp.h b/sys/compat/linuxkpi/common/include/linux/tcp.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/tcp.h
@@ -0,0 +1,72 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020-2021 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef __LKPI_LINUX_TCP_H
+#define __LKPI_LINUX_TCP_H
+
+#include <sys/types.h>
+#include <linux/skbuff.h>
+
+/* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */
+struct tcphdr {
+ uint16_t source; /* (u) */
+ uint16_t dest; /* (u) */
+ uint32_t th_seq; /* (u) */
+ uint32_t th_ack; /* (u) */
+#if BYTE_ORDER == LITTLE_ENDIAN
+ uint8_t th_x2:4, doff:4;
+#elif BYTE_ORDER == BIG_ENDIAN
+ uint8_t doff:4, th_x2:4;
+#endif
+ uint8_t th_flags; /* (u) */
+ uint16_t th_win; /* (u) */
+ uint16_t check;
+ uint16_t th_urg; /* (u) */
+};
+
+static __inline struct tcphdr *
+tcp_hdr(struct sk_buff *skb)
+{
+
+ return (struct tcphdr *)skb_transport_header(skb);
+}
+
+static __inline uint32_t
+tcp_hdrlen(struct sk_buff *skb)
+{
+ struct tcphdr *th;
+
+ th = tcp_hdr(skb);
+ return (4 * th->doff);
+}
+
+#endif /* __LKPI_LINUX_TCP_H */
diff --git a/sys/compat/linuxkpi/common/include/linux/udp.h b/sys/compat/linuxkpi/common/include/linux/udp.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/udp.h
@@ -0,0 +1,54 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020-2021 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef __LKPI_LINUX_UDP_H
+#define __LKPI_LINUX_UDP_H
+
+#include <sys/types.h>
+#include <linux/skbuff.h>
+
+/* (u) unconfirmed structure field names. */
+struct udphdr {
+ uint16_t source; /* (u) */
+ uint16_t dest;
+ uint16_t len; /* (u) */
+ uint16_t check;
+};
+
+static __inline struct udphdr *
+udp_hdr(struct sk_buff *skb)
+{
+
+ return (struct udphdr *)skb_transport_header(skb);
+}
+
+#endif /* __LKPI_LINUX_UDP_H */

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