Was du suchst ist "hostapd":

hostapd

Turns Your WLAN Card into a WPA capable Access Point

hostapd is a user space daemon for access point and authentication servers. It implements IEEE 802.11 access point management, IEEE 802.1X/WPA/WPA2/EAP Authenticators, RADIUS client, EAP server, and RADIUS authentication server. Currently, hostapd supports HostAP, madwifi, and prism54 drivers. It also supports wired IEEE 802.1X authentication via any ethernet driver.