K 10
svn:author
V 2
ae
K 8
svn:date
V 27
2018-10-21T18:13:45.353966Z
K 7
svn:log
V 399
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

END