Andrey V. Elsukov 19873f4780 Add handling for appearing/disappearing of ingress addresses to if_gre(4).
* register handler for ingress address appearing/disappearing;
* add new srcaddr hash table for fast softc lookup by srcaddr;
* when srcaddr disappears, clear IFF_DRV_RUNNING flag from interface,
  and set it otherwise;

MFC after:	1 month
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D17214
2018-10-21 18:13:45 +00:00
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