CFR: FIB handling improvements

[Julian Elischer]

On 8/22/13 5:52 AM, Alan Somers wrote:
> On Wed, Aug 21, 2013 at 3:28 PM, Will Andrews <will at firepipe.net> wrote:
>
>> On Wed, Aug 21, 2013 at 12:20 PM, Hiroki Sato <hrs at freebsd.org> wrote:
>>> wi> * Always add loopback routes for non-zero FIBs, for both IPv4 and
>>> wi> IPv6.  Arguably, this could be a policy issue, but it is currently
>>> wi> less-than-trivial to specify (in rc.conf) that a route needs to be
>>> wi> applied to every FIB.
>>>
>>>   I am not sure why this is needed.  Are the loopback host routes
>>>   installed into all of the FIBs automatically when lo0 is initialized?
>>>
>>>   Even if it is required, get_fibmod() is not necessary.  The following
>>>   should work:
>>>
>>>   # route add -inet 127.0.0.1/8 -iface lo0 -fib all
>> Other places in rc.d/routing can make use of 'all' in that case.
>>
>> No, loopback host routes are not installed into all FIBs, only FIB 0.
>> This is with rt_add_addr_allfibs == 0 (see rtinit1()), which probably
>> explains why.  We could add an override for lo0 addresses, but perhaps
>> this is something that should be configurable?  i.e. allow the
>> administrator to specify in rc.conf which FIBs lo0's host route should
>> be placed on?

if rt_add_addr_allfibs ==0 then non 0 fibs should be entirely empty by 
default.
it's up to the user to put the required contents into them.

at least that was how I felt about it when I wrote it..
:-)

> When would you ever want lo0 to be inaccessible from some fibs?  I can't
> think of any reasons.
>
>> --Will.
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