diff --git a/libcontainer/nsenter/idmap.h b/libcontainer/nsenter/idmap.h
new file mode 100644
index 000000000..fa25a3bfb
--- /dev/null
+++ b/libcontainer/nsenter/idmap.h
@@ -0,0 +1,76 @@
+#ifndef IDMAP_H
+#define IDMAP_H
+
+#include <sys/mount.h>
+// Centos-7 doesn't have this file nor the __has_include() directive, so let's
+// just leave this commented out and we can uncomment when it hits EOL (2024-06-30).
+//#include <linux/mount.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+/* mount_setattr() */
+#ifndef MOUNT_ATTR_IDMAP
+#define MOUNT_ATTR_IDMAP 0x00100000
+#endif
+
+#ifndef __NR_mount_setattr
+	#if defined _MIPS_SIM
+		#if _MIPS_SIM == _MIPS_SIM_ABI32	/* o32 */
+			#define __NR_mount_setattr (442 + 4000)
+		#endif
+		#if _MIPS_SIM == _MIPS_SIM_NABI32	/* n32 */
+			#define __NR_mount_setattr (442 + 6000)
+		#endif
+		#if _MIPS_SIM == _MIPS_SIM_ABI64	/* n64 */
+			#define __NR_mount_setattr (442 + 5000)
+		#endif
+	#else
+		#define __NR_mount_setattr 442
+	#endif
+#endif
+#ifndef MOUNT_ATTR_SIZE_VER0
+struct mount_attr {
+	__u64 attr_set;
+	__u64 attr_clr;
+	__u64 propagation;
+	__u64 userns_fd;
+};
+#endif
+
+/* open_tree() */
+#ifndef OPEN_TREE_CLONE
+#define OPEN_TREE_CLONE 1
+#endif
+
+#ifndef OPEN_TREE_CLOEXEC
+#define OPEN_TREE_CLOEXEC O_CLOEXEC
+#endif
+
+#ifndef __NR_open_tree
+	#if defined _MIPS_SIM
+		#if _MIPS_SIM == _MIPS_SIM_ABI32	/* o32 */
+			#define __NR_open_tree 4428
+		#endif
+		#if _MIPS_SIM == _MIPS_SIM_NABI32	/* n32 */
+			#define __NR_open_tree 6428
+		#endif
+		#if _MIPS_SIM == _MIPS_SIM_ABI64	/* n64 */
+			#define __NR_open_tree 5428
+		#endif
+	#else
+		#define __NR_open_tree 428
+	#endif
+#endif
+
+static inline int sys_mount_setattr(int dfd, const char *path, unsigned int flags, struct mount_attr *attr, size_t size)
+{
+	return syscall(__NR_mount_setattr, dfd, path, flags, attr, size);
+}
+
+static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags)
+{
+	return syscall(__NR_open_tree, dfd, filename, flags);
+}
+
+
+#endif /* IDMAP_H */