ipv6: keep existing flags when setting IFA_F_OPTIMISTIC

[ Upstream commit 9a1ec4612c9bfc94d4185e3459055a37a685e575 ]

Commit 64236f3f3d74 ("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: 64236f3f3d74 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 3939dd290c4487b3fe9cf43eeca40cc5965bb1b5..ff873c84e450e589ca21ec574309fea955a26da5 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2453,7 +2453,7 @@ ok:
 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
                        if (in6_dev->cnf.optimistic_dad &&
                            !net->ipv6.devconf_all->forwarding && sllao)
-                               addr_flags = IFA_F_OPTIMISTIC;
+                               addr_flags |= IFA_F_OPTIMISTIC;
 #endif
 
                        /* Do not allow to create too much of autoconfigured