tree c4c31034bd85034845974de89ddff52ab04dfdcf
parent 1f8481d19af005c469ee50cf972486240905585e
author Patrick McHardy <kaber@trash.net> 1179878401 -0700
committer David S. Miller <davem@davemloft.net> 1179878401 -0700

[RTNETLINK]: Allow changing of subsets of netdevice flags in rtnl_setlink

rtnl_setlink doesn't allow to change subsets of the flags, just to override
the set entirely by a new one. This means that for simply setting a device
up or down userspace first needs to query the current flags, change it and
send the changed flags back, which is racy and needlessly complicated.

Mask the flags using ifi_change since this is what it is intended for.
For backwards compatibility treat ifi_change == 0 as ~0 (even though it
seems quite unlikely that anyone has been using this so far).

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>