8036234c72
Summary: Currently netinet6/ code allocates IPv6 prefixes (nd_prefix) for both manually-assigned addresses and advertised prefixes. As a result, prefixes from manually-assigned prefixes can be seen in `ndp -p` list and be cleared via `ndp -P`. The latter relies on the SIOCSPFXFLUSH_IN6 ioctl to clear to prefix list. The original intent of the SIOCSPFXFLUSH_IN6 was to clear prefixes originated from the advertising routers: ``` 1998-09-02 JINMEI, Tatuya <jinmei@isl.rdc.toshiba.co.jp> * nd6.c (nd6_ioctl): added 2 new ioctls; SIOCSRTRFLUSH_IN6 and SIOCSPFXFLUSH_IN6. The former is to flush all default routers in the default router list, and the latter is to flush all the prefixes and the addresses derived from them in the prefix list. ``` Restore the intent by marking prefixes derived from the RA messages with newly-added ndpr_flags.ra_derived flag and skip prefixes not marked with such flag during deletion and listing. Differential Revision: https://reviews.freebsd.org/D36312 MFC after: 2 weeks
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