Here is the link which tells us the way to do it..
However, your question is more of a Routing configuration on the L3 device and has nothing to do with Wireless if your Wireless configurations are already done.
Please let me know if you need any wireless config help and we will help you in the WIreless forum.. if not please post the same question in Routing Forum in the Community and you will get the right resource..
lemme know if this answered your question..
Please dont forget to rate the posts which answered your question and mark it as answered or was helpfull
Sur is on target with this response. 5 stars bud
If I could add. Having used ACLs extensivily myself, I would not use an ACL on the contoller if you have a large deployment. Put it on the wired side, if you go teh ACL route.
Please mark the Question as Answered, if the provided information by Surendra and George is correct and it helped. By doing that others can take benefit as well.
Community Manager – Wireless