Re: XDP Software Issue - Payload Matching

[Christian Deacon <gamemann@gflclan.com>]

Hey Toke,


I apologize for the long delay on this. A lot has been going on recently!


I attempted to match payload data using the packet's payload as the BPF 
map key. Unfortunately, I didn't have any success with this. I stored my 
findings here from last month:


https://github.com/gamemann/XDP-Dynamic-Payload-Matching#section-methodfour-fail


I'd assume I may be missing something here, though.


I saw another XDP mailing list thread pop up recently regarding matching 
TCP payload data. I believe this may be what they're trying to achieve 
(being able to match dynamic payload data with XDP).


I was wondering if you had any other ideas on how we can match packet 
payload data against a BPF map.


Thank you for your time!


On 5/22/2020 10:12 AM, Toke Høiland-Jørgensen wrote:
> Christian Deacon <gamemann@gflclan.com> writes:
>
>> Hey Toke,
>>
>> I apologize for the delay on this. I've been working on a couple other
>> XDP/BPF projects recently.
>>
>> Thank you for the information you provided!
>>
>> Do you know of any open-source projects/examples that uses the method
>> you're suggesting to compare packet data without using for/while loops?
>> I haven't tried implementing the code yet, but I'm not entirely sure how
>> I am going to do so.
> Well, having a map that uses IP addresses as lookup key is kinda the
> same, I suppose, it's just a very limited part of the payload that's
> being used as the key. But other than that, no, please consider this a
> completely off-the-top-of-my-head idea with no warranties, implied or
> otherwise :)
>
> -Toke
>