Re: [PATCH net-next v2 2/3] net: ipv6/addrconf: introduce a regen_min_advance sysctl

[David Ahern <dsahern@kernel.org>]

On 2/13/24 11:26 PM, Alex Henrie wrote:
> In RFC 8981, REGEN_ADVANCE cannot be less than 2 seconds, and the RFC
> does not permit the creation of temporary addresses with lifetimes
> shorter than that:
> 
>> When processing a Router Advertisement with a
>> Prefix Information option carrying a prefix for the purposes of
>> address autoconfiguration (i.e., the A bit is set), the host MUST
>> perform the following steps:
> 
>> 5.  A temporary address is created only if this calculated preferred
>>     lifetime is greater than REGEN_ADVANCE time units.
> 
> However, some users want to change their IPv6 address as frequently as
> possible regardless of the RFC's arbitrary minimum lifetime. For the
> benefit of those users, add a regen_min_advance sysctl parameter that
> can be set to below or above 2 seconds.
> 
> Link: https://datatracker.ietf.org/doc/html/rfc8981
> Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
> ---
>  Documentation/networking/ip-sysctl.rst | 10 ++++++++++
>  include/linux/ipv6.h                   |  1 +
>  include/net/addrconf.h                 |  5 +++--
>  net/ipv6/addrconf.c                    | 11 ++++++++++-
>  4 files changed, 24 insertions(+), 3 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>