[PATCH] net: ipv6: don't generate link-local address in any addr_gen_mode

[David Ahern]

On 9/9/21 12:20 AM, Lorenzo Colitti wrote:
>> I think another addr_gen_mode is better than a separate sysctl. It looks
>> like IN6_ADDR_GEN_MODE_STABLE_PRIVACY and IN6_ADDR_GEN_MODE_RANDOM are
>> the ones used for RAs, so add something like:
>>
>> IN6_ADDR_GEN_MODE_STABLE_PRIVACY_NO_LLA,
>> IN6_ADDR_GEN_MODE_RANDOM_NO_LLA,
> 
> I think the real requirement here (which wasn't clear in this thread)
> is that the network needs to control the interface ID (i.e., the
> bottom 64 bits) of the link-local address, but the device is free to
> use whatever interface IDs to form global addresses. See:
> https://www.etsi.org/deliver/etsi_ts/129000_129099/129061/15.03.00_60/ts_129061v150300p.pdf
> 
> How do you think that would best be implemented?

There is an established paradigm for configuring how an IPv6 address is
created or whether it is created at all - the IFLA_INET6_ADDR_GEN_MODE
attribute.

> 
> 1. The actual interface ID could be passed in using IFLA_INET6_TOKEN,
> but there is only one token, so that would cause all future addresses
> to use the token, disabling things like privacy addresses (bad).
> 2. We could add new IN6_ADDR_GEN_MODE_STABLE_PRIVACY_LL_TOKEN,
> IN6_ADDR_GEN_MODE_RANDOM_LL_TOKEN, etc., but we'd need to add one such
> mode for every new mode we add.
> 3. We could add a separate sysctl for the link-local address, but you
> said that per-device sysctls aren't free.

per-device sysctl's are one of primary causes of per netdev memory usage.

Besides that there is no reason to add complexity by having a link
attribute and a sysctl for this feature.

> 4. We could change the behaviour so that if the user configures a
> token and then sets IN6_ADDR_GEN_MODE_*, then we use the token only
> for the link-local address. But that would impact backwards
> compatibility.
> 
> Thoughts?

We can have up to 255 ADDR_GEN_MODEs (GEN_MODE is a u8). There is
established code for handling the attribute and changes to it. Let's
reuse it.