[Bug 235500] [netgraph] tunnel nesting limit hard coded

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235500

            Bug ID: 235500
           Summary: [netgraph] tunnel nesting limit hard coded
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: i.bakirov at gmail.com

After system switch from 11-p8 to 12 nested PPTP & L2TP tunnels based on MPD5
does not work.

Got this error:
kernel: ng0: if_output recursively called too many (2)

After analyzing commits, found that for GIF, GRE and ME interfaces tunnel
nesting limit check introduced and limit can be set by sysctl
net.link.gif.max_nesting (man if_gif(4)):
https://svnweb.freebsd.org/base?view=revision&revision=336131

For the netgraph based tunnel nesting limit is checked against 1 and this limit
can not be set by systcl:
https://svnweb.freebsd.org/base?view=revision&revision=337278

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