1 files changed, 0 insertions, 89 deletions
diff --git a/fs/cifs/dns_resolve.c b/fs/cifs/dns_resolve.c
deleted file mode 100644
index 0458d28d71aa..000000000000
--- a/fs/cifs/dns_resolve.c
+++ /dev/null
@@ -1,89 +0,0 @@
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- *   Copyright (c) 2007 Igor Mammedov
- *   Author(s): Igor Mammedov (niallain@gmail.com)
- *              Steve French (sfrench@us.ibm.com)
- *              Wang Lei (wang840925@gmail.com)
- *		David Howells (dhowells@redhat.com)
- *
- *   Contains the CIFS DFS upcall routines used for hostname to
- *   IP address translation.
- *
- */
-
-#include <linux/slab.h>
-#include <linux/dns_resolver.h>
-#include "dns_resolve.h"
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifs_debug.h"
-
-/**
- * dns_resolve_server_name_to_ip - Resolve UNC server name to ip address.
- * @unc: UNC path specifying the server (with '/' as delimiter)
- * @ip_addr: Where to return the IP address.
- * @expiry: Where to return the expiry time for the dns record.
- *
- * The IP address will be returned in string form, and the caller is
- * responsible for freeing it.
- *
- * Returns length of result on success, -ve on error.
- */
-int
-dns_resolve_server_name_to_ip(const char *unc, char **ip_addr, time64_t *expiry)
-{
-	struct sockaddr_storage ss;
-	const char *hostname, *sep;
-	char *name;
-	int len, rc;
-
-	if (!ip_addr || !unc)
-		return -EINVAL;
-
-	len = strlen(unc);
-	if (len < 3) {
-		cifs_dbg(FYI, "%s: unc is too short: %s\n", __func__, unc);
-		return -EINVAL;
-	}
-
-	/* Discount leading slashes for cifs */
-	len -= 2;
-	hostname = unc + 2;
-
-	/* Search for server name delimiter */
-	sep = memchr(hostname, '/', len);
-	if (sep)
-		len = sep - hostname;
-	else
-		cifs_dbg(FYI, "%s: probably server name is whole unc: %s\n",
-			 __func__, unc);
-
-	/* Try to interpret hostname as an IPv4 or IPv6 address */
-	rc = cifs_convert_address((struct sockaddr *)&ss, hostname, len);
-	if (rc > 0)
-		goto name_is_IP_address;
-
-	/* Perform the upcall */
-	rc = dns_query(current->nsproxy->net_ns, NULL, hostname, len,
-		       NULL, ip_addr, expiry, false);
-	if (rc < 0)
-		cifs_dbg(FYI, "%s: unable to resolve: %*.*s\n",
-			 __func__, len, len, hostname);
-	else
-		cifs_dbg(FYI, "%s: resolved: %*.*s to %s expiry %llu\n",
-			 __func__, len, len, hostname, *ip_addr,
-			 expiry ? (*expiry) : 0);
-	return rc;
-
-name_is_IP_address:
-	name = kmalloc(len + 1, GFP_KERNEL);
-	if (!name)
-		return -ENOMEM;
-	memcpy(name, hostname, len);
-	name[len] = 0;
-	cifs_dbg(FYI, "%s: unc is IP, skipping dns upcall: %s\n",
-		 __func__, name);
-	*ip_addr = name;
-	return 0;
-}