On 8/2/21 6:40 AM, Rocco Yue wrote:

On Sat, 2021-07-31 at 11:17 -0600, David Ahern wrote:
On 7/30/21 7:52 PM, Rocco Yue wrote:

quoted

IFLA_INET6_RA_MTU set. You can set "reject_message" in the policy to
return a message that "IFLA_INET6_RA_MTU can not be set".

Hi David,

Regarding setting "reject_message" in the policy, after reviewing
the code, I fell that it is unnecessary, because the cost of
implementing it seems to be a bit high, which requires modifying
the function interface. The reasons is as follows:

The policy can be setup now to do the right thing once the extack
argument is available.

do_setlink() has an extack argument. It calls validate_linkmsg which
calls validate_link_af meaning support can be added in a single patch.
If you decide to do it, then it should be a separate patch preceding
this one.

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