K 10
svn:author
V 2
ae
K 8
svn:date
V 27
2018-07-09T11:03:28.382182Z
K 7
svn:log
V 273
Deduplicate the code.

Add generic function if_tunnel_check_nesting() that does check for
allowed nesting level for tunneling interfaces and also does loop
detection. Use it in gif(4), gre(4) and me(4) interfaces.

Differential Revision:	https://reviews.freebsd.org/D16162

END