IPv6 redirect doesn't work.

[steven_chen3_dell.com]

Summary

If the redirect target isn't link local address, and redirect destination and redirect target address are the same,
the route install for redirect will fail.
In this cause, the type of gateway address is AF_LINK, the size of that address structure is 56 bytes, but the max size of store address of nhop
is only 28 bytes, which cause size check failure.

[melifaro]

Thank you for submitting the patch. I’m not sure I fully understand the problem and the solution.
Could you please provide some examples?