For WiFi access point, see this:
http://www.multitech.net/developer/software/mlinux/using-mlinux/wifi-access-point/
For station, see this:
http://www.multitech.net/developer/software/mlinux/using-mlinux/wifi-station/
For access point you will probably want dnsmasq, which is available from the feeds using the opkg command.