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    netfilter: xtables: idletimer target implementation · 0902b469
    Luciano Coelho 提交于
    This patch implements an idletimer Xtables target that can be used to
    identify when interfaces have been idle for a certain period of time.
    
    Timers are identified by labels and are created when a rule is set with a new
    label.  The rules also take a timeout value (in seconds) as an option.  If
    more than one rule uses the same timer label, the timer will be restarted
    whenever any of the rules get a hit.
    
    One entry for each timer is created in sysfs.  This attribute contains the
    timer remaining for the timer to expire.  The attributes are located under
    the xt_idletimer class:
    
    /sys/class/xt_idletimer/timers/<label>
    
    When the timer expires, the target module sends a sysfs notification to the
    userspace, which can then decide what to do (eg. disconnect to save power).
    
    Cc: Timo Teras <timo.teras@iki.fi>
    Signed-off-by: NLuciano Coelho <luciano.coelho@nokia.com>
    Signed-off-by: NPatrick McHardy <kaber@trash.net>
    0902b469
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