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    [PATCH] ipw2200: Enable rtap interface for RF promiscuous mode while associated · d685b8c2
    Zhu Yi 提交于
    With this patch, a new promiscuous mode is enabled. If the module is loaded
    with the rtap_iface=1 module parameter, two interfaces will be created
    (instead of just one).
    
    The second interface is prefixed 'rtap' and provides received 802.11 frames
    on the current channel to user space in a radiotap header format.
    
    Example usage:
    
            % modprobe ipw2200 rtap_iface=1
            % iwconfig eth1 essid MyNetwork
            % dhcpcd eth1
            % tcpdump -i rtap0
    
    If you do not specify 'rtap_iface=1' then the rtap interface will
    not be created and you will need to turn it on via:
    
            % echo 1 > /sys/bus/pci/drivers/ipw2200/*/rtap_iface
    
    You can filter out what type of information is passed to user space via
    the rtap_filter sysfs entry.  Currently you can tell the driver to
    transmit just the headers (which will provide the RADIOTAP and IEEE
    802.11 header but not the payload), to filter based on frame control
    type (Management, Control, or Data), and whether to report transmitted
    frames, received frames, or both.
    
    The transmit frame reporting is based on a patch by Stefan Rompf.
    
    Filters can be get and set via a sysfs interface. For example, set the
    filter to only send headers (0x7), don't report Tx'd frames (0x10), and
    don't report data frames (0x100):
    
            % echo 0x117 > /sys/bus/pci/drivers/ipw2200/*/rtap_filter
    
    All your packets are belong to us:
    
            % tethereal -n -i rtap0
    Signed-off-by: NJames Ketrenos <jketreno@linux.intel.com>
    Signed-off-by: NZhu Yi <yi.zhu@intel.com>
    Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
    d685b8c2
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