Re: [PATCH net-next] ipv6: don't generate link-local addr in random or privacy mode

Can't 4 be the same as 3? The same netlink message can configure both
the addr_gen_mode and the token, no?

It seems to me that the following should work, and would be much simpler.

1. Bring the interface down. All addresses are deleted.
2. Send a netlink request to set addr_gen_mode RANDOM_LL_TOKEN or
PRIVACY_LL_TOKEN and set the token.
3. Bring the interface up. Autoconf runs. The link-local address is
generated from the token. An RS is sent. When the RA is received, the
global address is generated using RFC 7217 or randomly.

Could you simply manually add an ipv6 link local address to the
interface while it is down (ip -6 addr add fe80::..../64 dev X), then
bring the interface up (ip link set dev X up)...
All that would need to happen is the automatic link local generation
would need to be suppressed if there's already a link local ip
configured - which sounds like a good idea anyway, since why have two?
(btw. even a manually added link local ip will get deleted when the
interface gets brought back down)