netdev - Re: [patch net-next] ipv6: allow userspace to create address with IFLA_F

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Date:	Fri, 25 Oct 2013 06:05:40 -0400
From:	Vladislav Yasevich <vyasevich@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	thaller@...hat.com, Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [patch net-next] ipv6: allow userspace to create address with
 IFLA_F_TEMPORARY flag

On Thu, Oct 24, 2013 at 12:59 PM, Jiri Pirko <jiri@...nulli.us> wrote:
> Thu, Oct 24, 2013 at 04:02:53PM CEST, hannes@...essinduktion.org wrote:
>>On Thu, Oct 24, 2013 at 03:45:55PM +0200, Jiri Pirko wrote:
>>> This is needed in order to implement userspace address configuration,
>>> namely ip6-privacy (rfc4941) in NetworkManager.
>>>
>>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>>> ---
>>>  net/ipv6/addrconf.c | 3 ++-
>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
>>> index cd3fb30..962c7c9 100644
>>> --- a/net/ipv6/addrconf.c
>>> +++ b/net/ipv6/addrconf.c
>>> @@ -3715,7 +3715,8 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
>>>              return -ENODEV;
>>>
>>>      /* We ignore other flags so far. */
>>> -    ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
>>> +    ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS |
>>> +                                  IFA_F_TEMPORARY);
>>>
>>>      ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
>>>      if (ifa == NULL) {
>>
>>Hm, the kernel will pick up IFA_F_TEMPORARY marked addresses and do ipv6 address
>>regeneration (depending on lifetimes). Is this intended?
>
> I think that that behaviour is valid. It is in compliance with valid lft and
> preferred lft behaviour.
>

Actually, I don't think it would do the regeneration since ifpub
pointer is not set.

I appears that the temp address management would have to be done in
userspace.

-vlad


>>
>>Btw. I am very interested in this topic as there is currently work in the IETF
>>to move away from eui-48 generation of addresses:
>>
>>https://datatracker.ietf.org/doc/draft-ietf-6man-stable-privacy-addresses/
>>
>>This needs to be done in userspace as we depend on a secret generated at
>>system install time.
>>
>>Greetings,
>>
>>  Hannes
>>
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