1 files changed, 28 insertions, 0 deletions
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index f7767bf22406..4845ba2113fd 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -2274,3 +2274,31 @@ ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
 	return ret;
 }
 EXPORT_SYMBOL_GPL(xdr_stream_decode_string_dup);
+
+/**
+ * xdr_stream_decode_opaque_auth - Decode struct opaque_auth (RFC5531 S8.2)
+ * @xdr: pointer to xdr_stream
+ * @flavor: location to store decoded flavor
+ * @body: location to store decode body
+ * @body_len: location to store length of decoded body
+ *
+ * Return values:
+ *   On success, returns the number of buffer bytes consumed
+ *   %-EBADMSG on XDR buffer overflow
+ *   %-EMSGSIZE if the decoded size of the body field exceeds 400 octets
+ */
+ssize_t xdr_stream_decode_opaque_auth(struct xdr_stream *xdr, u32 *flavor,
+				      void **body, unsigned int *body_len)
+{
+	ssize_t ret, len;
+
+	len = xdr_stream_decode_u32(xdr, flavor);
+	if (unlikely(len < 0))
+		return len;
+	ret = xdr_stream_decode_opaque_inline(xdr, body, RPC_MAX_AUTH_SIZE);
+	if (unlikely(ret < 0))
+		return ret;
+	*body_len = ret;
+	return len + ret;
+}
+EXPORT_SYMBOL_GPL(xdr_stream_decode_opaque_auth);