v4.19.13 snapshot.
diff --git a/include/net/compat.h b/include/net/compat.h
new file mode 100644
index 0000000..4c6d756
--- /dev/null
+++ b/include/net/compat.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef NET_COMPAT_H
+#define NET_COMPAT_H
+
+
+struct sock;
+
+#if defined(CONFIG_COMPAT)
+
+#include <linux/compat.h>
+
+struct compat_msghdr {
+ compat_uptr_t msg_name; /* void * */
+ compat_int_t msg_namelen;
+ compat_uptr_t msg_iov; /* struct compat_iovec * */
+ compat_size_t msg_iovlen;
+ compat_uptr_t msg_control; /* void * */
+ compat_size_t msg_controllen;
+ compat_uint_t msg_flags;
+};
+
+struct compat_mmsghdr {
+ struct compat_msghdr msg_hdr;
+ compat_uint_t msg_len;
+};
+
+struct compat_cmsghdr {
+ compat_size_t cmsg_len;
+ compat_int_t cmsg_level;
+ compat_int_t cmsg_type;
+};
+
+int compat_sock_get_timestamp(struct sock *, struct timeval __user *);
+int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
+
+#else /* defined(CONFIG_COMPAT) */
+/*
+ * To avoid compiler warnings:
+ */
+#define compat_msghdr msghdr
+#define compat_mmsghdr mmsghdr
+#endif /* defined(CONFIG_COMPAT) */
+
+int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,
+ struct sockaddr __user **, struct iovec **);
+struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval);
+int put_cmsg_compat(struct msghdr*, int, int, int, void *);
+
+int cmsghdr_from_user_compat_to_kern(struct msghdr *, struct sock *,
+ unsigned char *, int);
+
+int compat_mc_setsockopt(struct sock *, int, int, char __user *, unsigned int,
+ int (*)(struct sock *, int, int, char __user *,
+ unsigned int));
+int compat_mc_getsockopt(struct sock *, int, int, char __user *, int __user *,
+ int (*)(struct sock *, int, int, char __user *,
+ int __user *));
+
+#endif /* NET_COMPAT_H */