[Bug 217607] ng_cisco flow control messages and IPv6

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217607

            Bug ID: 217607
           Summary: ng_cisco flow control messages and IPv6
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: lukasz.wojcik at zoho.com

Created attachment 180593
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180593&action=edit
sketch of a patch fixing the issue

ng_cisco's cisco_notify() routine only sends flow control messages to nodes
connected via 'inet' hook, completely ignoring those connected via 'inet6'.
This poses some problem if peer node relies on link status information passed
from ng_cisco. I'd therefore like to suggest a patch (perhaps something similar
to what I attached). All it does is to make ng_cisco node pass flow control
messages to *both* 'inet' and 'inet6' peers. It seems to me that it is both
possible and sensible to expect both mentioned hooks to be connected at the
same time.

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