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Thread: Problems using unbranded Ralink USB wireless stick as AP

  1. #1
    Join Date
    May 2009
    Location
    Cambridge, UK
    Beans
    4
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Problems using unbranded Ralink USB wireless stick as AP

    I've been going round and round in circles on this one (including making the leap from Hardy to Jaunty), and I think I need to give up and ask advice.

    I have an unbranded (seriously, the only concession to the manufacturer on the packaging is "Made in China") USB wireless device using the Ralink RT2528L chip:

    Code:
    rhodri@ghlenlivid$ lsusb
    Bus 002 Device 006: ID 148f:2573 Ralink Technology, Corp. RT2501USB Wireless Adapter
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    I've applied the notional fix to net/mac80211/cfg.c to let it work as an AP:

    Code:
    static bool nl80211_type_check(enum nl80211_iftype type)
    {
    	switch (type) {
    	case NL80211_IFTYPE_ADHOC:
    	case NL80211_IFTYPE_STATION:
    	case NL80211_IFTYPE_MONITOR:
    #ifdef CONFIG_MAC80211_MESH
    	case NL80211_IFTYPE_MESH_POINT:
    #endif
    +	case NL80211_IFTYPE_AP:
    +	case NL80211_IFTYPE_AP_VLAN:
    	case NL80211_IFTYPE_WDS:
    		return true;
    	default:
    		return false;
    	}
    }
    I've even applied the fix to hostapd that ignores "Unknown" status returns for Association and Authentication Responses from USB devices.

    dmesg still gives me:

    Code:
    [16303.296014] usb 2-5: new high speed USB device using ehci_hcd and address 6
    [16303.589830] usb 2-5: configuration #1 chosen from 1 choice
    [16303.699829] phy6 -> rt2500usb_init_eeprom: Error - Invalid RT chipset detected.
    [16303.699834] phy6 -> rt2x00lib_probe_dev: Error - Failed to allocate device.
    ...though for reasons I don't understand that doesn't seem to alarm anyone on the threads I've managed to find through Google.

    Then I create a trivial hostapd config file:
    Code:
    rhodri@ghlenlivid$ cat ./hostapd-minimal.conf 
    interface=wlan1
    driver=nl80211
    ssid=test
    ...and try it out:
    Code:
    rhodri@ghlenlivid$ sudo ./hostapd ./hostapd-minimal.conf 
    Configuration file: ./hostapd-minimal.conf
    Failed to set interface wlan1 to master mode.
    nl80211 driver initialization failed.
    ELOOP: remaining socket: sock=5 eloop_data=0x848b848 user_data=(nil) handler=0x807b930
    What the heck am I doing wrong? I'm a newbie when it comes to Linux innards, so you may have to explain things in small words

  2. #2
    Join Date
    May 2009
    Location
    Cambridge, UK
    Beans
    4
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Problems using unbranded Ralink USB wireless stick as AP

    Interestingly, if I do the same on an Acer notebook running 8.10 and the madwifi drivers, I initially get the same result. If I "ifconfig down" the ath0 interface and use wlanconfig to destroy and recreate it in AP mode, then hostapd runs fairly happily (though I can't get hostapd_cli to work now). Of course, wlanconfig isn't an option with the hostap drivers, and iw won't do that...

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