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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Daniel Borkmann <daniel@iogearbox.net>
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: Fri, 27 Mar 2020 17:41:34 -0700
Message-ID: <CAEf4BzY5dd-wXbLziCQJOgikY-qvD+GQC=9HHZGCqmM_R-2mJA@mail.gmail.com> (raw)
In-Reply-To: <555e1c69db7376c0947007b4951c260e1074efc3.1585323121.git.daniel@iogearbox.net>

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?

> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
> ---
>  include/net/cls_cgroup.h |  7 ++++++-
>  net/core/filter.c        | 21 +++++++++++++++++++++
>  2 files changed, 27 insertions(+), 1 deletion(-)
>

[...]

  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 [this message]
2020-03-28  1:56     ` Daniel Borkmann
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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