nd6: Remove anycast check in prelist_update

[pouria]

Summary

RFC 2462 is obsoleted by RFC 4862 and it made statements more clear
than before.
Considering SLAAC can't create anycast addresses by itself, remove its check.
While here, update comments based on RFC 4862.

[zlei]

Looks sane to me.

For the commit message,

ndp: Remove anycast check in prelist_update

I think the word ndp is a bit misleading. I read it this is a change for the userspace one usr.sbin/ndp. I'd prefer nd6_rtr: xxx or nd6: xxx, to indicate the change is for the kernel part.

[glebius]

In D56134#1286016, @zlei wrote:

I think the word ndp is a bit misleading. I read it this is a change for the userspace one usr.sbin/ndp. I'd prefer nd6_rtr: xxx or nd6: xxx, to indicate the change is for the kernel part.

Yep. Unfortunately there is little consistency in the history of this file and of nd6.c as well. I'd suggest in the future to stick to nd6: or netinet6: if the change is touching more than just ND part of IPv6.

[pouria]

In D56134#1286016, @zlei wrote:

For the commit message,

ndp: Remove anycast check in prelist_update

I think the word ndp is a bit misleading. I read it this is a change for the userspace one usr.sbin/ndp. I'd prefer nd6_rtr: xxx or nd6: xxx, to indicate the change is for the kernel part.

Thank you for your review, I'll change I commit messages to nd6: