ipv6: introduce secret_stable to ipv6_devconf

This patch implements the procfs logic for the stable_address knob:
The secret is formatted as an ipv6 address and will be stored per
interface and per namespace. We track initialized flag and return EIO
errors until the secret is set.

We don't inherit the secret to newly created namespaces.

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>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index 437a6a4b125a..5efa54ae567c 100644
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -170,6 +170,7 @@ enum {
         DEVCONF_ACCEPT_RA_FROM_LOCAL,
         DEVCONF_USE_OPTIMISTIC,
         DEVCONF_ACCEPT_RA_MTU,
+        DEVCONF_STABLE_SECRET,
         DEVCONF_MAX
 };