Broken IPsec + enc +pf/ipfw

[Matthew Grooms]

On 10/21/2014 1:39 PM, Kyle Williams wrote:
> On Tue Oct 21 11:35:15 2014, Matthew Grooms wrote:
>> Hey Kyle,
>>
>> Thanks for lending a hand. I tested a few myself last night but had no
>> luck. This morning I received an email off list that pointed to a patch
>> that was merged to 10 stable. It sounds promising ...
>>
>> Log:
>>    Merge r263091: fix mbuf flags clash that lead to failure of operation
>>    of IPSEC and packet filters.
>>
>> https://lists.freebsd.org/pipermail/svn-src-stable-10/2014-March/001111.html
>>
>> I won't have a chance to try it until after business hours tonight, but
>> will report back to the list with my results. Alternately, I assume you
>> also could upgrade to 10.1-RC2 as the MFC for this patch happened back
>> in March. I may go this route myself and then bump up to RELEASE in a
>> few weeks when it happens.
>
> r263091, r266800, and r272695 together on 10.0-RELENG works for me.
>
> I didn't test r263091 by itself.
>

I couldn't get a kernel to boot without crashing with the single patch, 
(r263091) applied. With all three patches, I can also confirm that the 
problem is resolved.

And some additional info: I also experimented with using gif + IPsec 
transport mode instead of enc + IPsec tunnel mode. I was hoping that 
changing the configuration would work around the issue. Unfortunately, 
gif + IPsec transport mode was exhibiting the same type of problems that 
enc + IPsec tunnel mode was, even with a patched kernel ( pf doesn't see 
the traffic on the gif interface so return traffic gets blocked for lack 
of a state entry ).

Thanks,

-Matthew