• Johannes Berg's avatar
    genetlink: make netns aware · 134e6375
    Johannes Berg authored
    
    
    This makes generic netlink network namespace aware. No
    generic netlink families except for the controller family
    are made namespace aware, they need to be checked one by
    one and then set the family->netnsok member to true.
    
    A new function genlmsg_multicast_netns() is introduced to
    allow sending a multicast message in a given namespace,
    for example when it applies to an object that lives in
    that namespace, a new function genlmsg_multicast_allns()
    to send a message to all network namespaces (for objects
    that do not have an associated netns).
    
    The function genlmsg_multicast() is changed to multicast
    the message in just init_net, which is currently correct
    for all generic netlink families since they only work in
    init_net right now. Some will later want to work in all
    net namespaces because they do not care about the netns
    at all -- those will have to be converted to use one of
    the new functions genlmsg_multicast_allns() or
    genlmsg_multicast_netns() whenever they are made netns
    aware in some way.
    
    After this patch families can easily decide whether or
    not they should be available in all net namespaces. Many
    genl families us it for objects not related to networking
    and should therefore be available in all namespaces, but
    that will have to be done on a per family basis.
    
    Note that this doesn't touch on the checkpoint/restart
    problem where network namespaces could be used, genl
    families and multicast groups are numbered globally and
    I see no easy way of changing that, especially since it
    must be possible to multicast to all network namespaces
    for those families that do not care about netns.
    Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    134e6375
nl80211.c 107 KB