cifs: add new routine for converting AF_INET and AF_INET6 addrs

...to consolidate some logic used in more than one place.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsproto.h

@@ -74,7 +74,7 @@ extern unsigned int smbCalcSize(struct smb_hdr *ptr);
 extern unsigned int smbCalcSize_LE(struct smb_hdr *ptr);
 extern int decode_negTokenInit(unsigned char *security_blob, int length,
 			enum securityEnum *secType);
-extern int cifs_inet_pton(const int, const char *source, void *dst);
+extern int cifs_convert_address(char *src, void *dst);
 extern int map_smb_to_linux_error(struct smb_hdr *smb, int logErr);
 extern void header_assemble(struct smb_hdr *, char /* command */ ,
 			    const struct cifsTconInfo *, int /* length of

fs/cifs/connect.c

@@ -1433,28 +1433,15 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
 
 	memset(&addr, 0, sizeof(struct sockaddr_storage));
 
-	if (volume_info->UNCip && volume_info->UNC) {
-		rc = cifs_inet_pton(AF_INET, volume_info->UNCip,
-				    &sin_server->sin_addr.s_addr);
-
-		if (rc <= 0) {
-			/* not ipv4 address, try ipv6 */
-			rc = cifs_inet_pton(AF_INET6, volume_info->UNCip,
-					    &sin_server6->sin6_addr.in6_u);
-			if (rc > 0)
-				addr.ss_family = AF_INET6;
-		} else {
-			addr.ss_family = AF_INET;
-		}
+	cFYI(1, ("UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip));
 
-		if (rc <= 0) {
+	if (volume_info->UNCip && volume_info->UNC) {
+		rc = cifs_convert_address(volume_info->UNCip, &addr);
+		if (!rc) {
 			/* we failed translating address */
 			rc = -EINVAL;
 			goto out_err;
 		}
-
-		cFYI(1, ("UNC: %s ip: %s", volume_info->UNC,
-			 volume_info->UNCip));
 	} else if (volume_info->UNCip) {
 		/* BB using ip addr as tcp_ses name to connect to the
 		   DFS root below */

fs/cifs/dns_resolve.c

@@ -37,24 +37,9 @@
 static int
 is_ip(const char *name)
 {
-	int rc;
-	struct sockaddr_in sin_server;
-	struct sockaddr_in6 sin_server6;
-
-	rc = cifs_inet_pton(AF_INET, name,
-			&sin_server.sin_addr.s_addr);
-
-	if (rc <= 0) {
-		/* not ipv4 address, try ipv6 */
-		rc = cifs_inet_pton(AF_INET6, name,
-				&sin_server6.sin6_addr.in6_u);
-		if (rc > 0)
-			return 1;
-	} else {
-		return 1;
-	}
-	/* we failed translating address */
-	return 0;
+	struct sockaddr_storage ss;
+
+	return cifs_convert_address(name, &ss);
 }
 
 static int

fs/cifs/netmisc.c

@@ -133,10 +133,12 @@ static const struct smb_to_posix_error mapping_table_ERRHRD[] = {
 	{0, 0}
 };
 
-/* Convert string containing dotted ip address to binary form */
-/* returns 0 if invalid address */
-
-int
+/*
+ * Convert a string containing text IPv4 or IPv6 address to binary form.
+ *
+ * Returns 0 on failure.
+ */
+static int
 cifs_inet_pton(const int address_family, const char *cp, void *dst)
 {
 	int ret = 0;
@@ -153,6 +155,30 @@ cifs_inet_pton(const int address_family, const char *cp, void *dst)
 	return ret;
 }
 
+/*
+ * Try to convert a string to an IPv4 address and then attempt to convert
+ * it to an IPv6 address if that fails. Set the family field if either
+ * succeeds.
+ *
+ * Returns 0 on failure.
+ */
+int
+cifs_convert_address(char *src, void *dst)
+{
+	struct sockaddr_in *s4 = (struct sockaddr_in *) dst;
+	struct sockaddr_in6 *s6 = (Struct sockaddr_in6 *) dst;
+
+	if (cifs_inet_pton(AF_INET, src, &s4->sin_addr.s_addr)) {
+		s4->sin_family = AF_INET;
+		return 1;
+	} else if (cifs_inet_pton(AF_INET6, src, &s6->sin6_addr.s6_addr)) {
+		s6->sin6_family = AF_INET6;
+		return 1;
+	}
+
+	return 0;
+}
+
 /*****************************************************************************
 convert a NT status code to a dos class/code
  *****************************************************************************/