ipv6: keep existing flags when setting IFA_F_OPTIMISTIC
[ Upstream commit 9a1ec461 ] Commit 64236f3f ("ipv6: introduce IFA_F_STABLE_PRIVACY flag") failed to update the setting of the IFA_F_OPTIMISTIC flag, causing the IFA_F_STABLE_PRIVACY flag to be lost if IFA_F_OPTIMISTIC is set. Cc: Erik Kline <ek@google.com> Cc: Fernando Gont <fgont@si6networks.com> Cc: Lorenzo Colitti <lorenzo@google.com> Cc: YOSHIFUJI Hideaki/吉藤英明 <hideaki.yoshifuji@miraclelinux.com> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Fixes: 64236f3f ("ipv6: introduce IFA_F_STABLE_PRIVACY flag") Signed-off-by: Bjørn Mork <bjorn@mork.no> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Kamal Mostafa <kamal@canonical.com>
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