diff --git a/include/net/compat.h b/include/net/compat.h
new file mode 100644
index 0000000..9983fd8
--- /dev/null
+++ b/include/net/compat.h
@@ -0,0 +1,39 @@
+#ifndef NET_COMPAT_H
+#define NET_COMPAT_H
+
+#include <linux/config.h>
+
+#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_cmsghdr {
+	compat_size_t	cmsg_len;
+	compat_int_t	cmsg_level;
+	compat_int_t	cmsg_type;
+};
+
+#else /* defined(CONFIG_COMPAT) */
+#define compat_msghdr	msghdr		/* to avoid compiler warnings */
+#endif /* defined(CONFIG_COMPAT) */
+
+extern int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);
+extern int verify_compat_iovec(struct msghdr *, struct iovec *, char *, int);
+extern asmlinkage long compat_sys_sendmsg(int,struct compat_msghdr __user *,unsigned);
+extern asmlinkage long compat_sys_recvmsg(int,struct compat_msghdr __user *,unsigned);
+extern asmlinkage long compat_sys_getsockopt(int, int, int, char __user *, int __user *);
+extern int put_cmsg_compat(struct msghdr*, int, int, int, void *);
+extern int cmsghdr_from_user_compat_to_kern(struct msghdr *, unsigned char *,
+		int);
+
+#endif /* NET_COMPAT_H */