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From: Daniel Borkmann <daniel@iogearbox.net>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Martynas Pumputis <m@lambda.lt>, Joe Stringer <joe@wand.net.nz>,
	bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH bpf-next 4/7] bpf: allow to retrieve cgroup v1 classid from v2 hooks
Date: Sat, 28 Mar 2020 02:56:37 +0100
Message-ID: <3e519e0e-aa52-67a5-98f6-0e259745e400@iogearbox.net> (raw)
In-Reply-To: <CAEf4BzY5dd-wXbLziCQJOgikY-qvD+GQC=9HHZGCqmM_R-2mJA@mail.gmail.com>

On 3/28/20 1:41 AM, Andrii Nakryiko wrote:
> On Fri, Mar 27, 2020 at 9:00 AM Daniel Borkmann <daniel@iogearbox.net> wrote:
>>
>> Today, Kubernetes is still operating on cgroups v1, however, it is
>> possible to retrieve the task's classid based on 'current' out of
>> connect(), sendmsg(), recvmsg() and bind-related hooks for orchestrators
>> which attach to the root cgroup v2 hook in a mixed env like in case
>> of Cilium, for example, in order to then correlate certain pod traffic
>> and use it as part of the key for BPF map lookups.
> 
> Have you tried getting this classid directly from task_struct in your
> BPF program with vmlinux.h and CO-RE? Seems like it should be pretty
> straightforward and not requiring a special BPF handler just for that?

To answer both questions (5/7 and this one) in the same mail here: my
understanding is that this would require to install additional tracing
programs on these hooks instead of being able to integrate them into [0]
for usage out of sock_addr and sock progs (similar as they are available
as well from tc from skb)?

Thanks,
Daniel

   [0] https://github.com/cilium/cilium/blob/master/bpf/bpf_sock.c

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27 15:58 [PATCH bpf-next 0/7] Various improvements to cgroup helpers Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 1/7] bpf: enable retrieval of socket cookie for bind/post-bind hook Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 2/7] bpf: enable perf event rb output for bpf cgroup progs Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 3/7] bpf: add netns cookie and enable it for bpf cgroup hooks Daniel Borkmann
2020-03-28  0:32   ` Andrii Nakryiko
2020-03-28  1:30     ` Daniel Borkmann
2020-03-28  1:48   ` Alexei Starovoitov
2020-03-28  2:16     ` Daniel Borkmann
2020-03-28  2:56       ` Alexei Starovoitov
2020-03-27 15:58 ` [PATCH bpf-next 4/7] bpf: allow to retrieve cgroup v1 classid from v2 hooks Daniel Borkmann
2020-03-28  0:41   ` Andrii Nakryiko
2020-03-28  1:56     ` Daniel Borkmann [this message]
2020-03-28 20:27       ` Andrii Nakryiko
2020-03-27 15:58 ` [PATCH bpf-next 5/7] bpf: enable bpf cgroup hooks to retrieve cgroup v2 and ancestor id Daniel Borkmann
2020-03-28  0:43   ` Andrii Nakryiko
2020-03-27 15:58 ` [PATCH bpf-next 6/7] bpf: enable retrival of pid/tgid/comm from bpf cgroup hooks Daniel Borkmann
2020-03-28  0:49   ` Andrii Nakryiko
2020-03-28  1:40     ` Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 7/7] bpf: add selftest cases for ctx_or_null argument type Daniel Borkmann
2020-03-28  0:51   ` Andrii Nakryiko

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