[Cake] CAKE upstreaming - testers wanted, ACK filtering rescuers needed

Ryan Mounce ryan at mounce.com.au
Wed Apr 25 21:10:29 EDT 2018

I'll investigate making the ACK filtering code safe, it is my mess after all :)

Eric obviously understands this stuff a lot better than me, it looks
like there are two issues?
- Lack of minimum length check for TCP header, should be fairly
straight-forward to fix
- The possibility of unsafely filtering part of a split GSO super-packet?

Ryan Mounce

ryan at mounce.com.au
0415 799 929

On 26 April 2018 at 06:15, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
> For those who have not been following the discussion on the upstreaming
> patches, here's an update:
> - I've just pushed patches to only split GSO packets when shaping below
>   one gigabit; and hopefully made the overhead compensation code deal
>   gracefully with GSO packets if someone for some reason wants to use
>   the shaper at speeds higher than that and still use the overhead
>   compensation code.
> - It turns out that the ACK filtering code does not properly sanity
>   check the packet sizes, and so can potentially crash the box running
>   CAKE if it receives malformed packets. So if no one steps up to fix
>   that within the next few days, or I'll submit the next version without
>   it (I'm not going to open that particular can of worms)... This
>   doesn't mean it can't be added back later, of course, it just means it
>   won't go upstream this time around.
> - NAT mode is now enabled by default; doesn't seem to be a good reason
>   not to as the compile time dependency already makes the module depend
>   on conntrack.
> So please do test the current git version (cobalt branch, still). I'm
> planning to resubmit on Friday.
> -Toke
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