1 files changed, 37 insertions, 0 deletions
diff --git a/fs/smb/client/dns_resolve.h b/fs/smb/client/dns_resolve.h
new file mode 100644
index 000000000000..36bc4a6a55bf
--- /dev/null
+++ b/fs/smb/client/dns_resolve.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ *   DNS Resolver upcall management for CIFS DFS
+ *   Handles host name to IP address resolution
+ *
+ *   Copyright (c) International Business Machines  Corp., 2008
+ *   Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ */
+
+#ifndef _DNS_RESOLVE_H
+#define _DNS_RESOLVE_H
+
+#include <linux/net.h>
+#include "cifsglob.h"
+#include "cifsproto.h"
+
+int dns_resolve_name(const char *dom, const char *name,
+		     size_t namelen, struct sockaddr *ip_addr);
+
+static inline int dns_resolve_unc(const char *dom, const char *unc,
+				  struct sockaddr *ip_addr)
+{
+	const char *name;
+	size_t namelen;
+
+	if (!unc || strlen(unc) < 3)
+		return -EINVAL;
+
+	extract_unc_hostname(unc, &name, &namelen);
+	if (!namelen)
+		return -EINVAL;
+
+	return dns_resolve_name(dom, name, namelen, ip_addr);
+}
+
+#endif /* _DNS_RESOLVE_H */