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Date:   Tue, 29 Sep 2020 18:24:07 -0700
From:   Martin KaFai Lau <>
To:     Daniel Borkmann <>
CC:     <>, <>,
        <>, <>
Subject: Re: [PATCH bpf-next v3 1/6] bpf: add classid helper only based on

On Tue, Sep 29, 2020 at 11:23:01PM +0200, Daniel Borkmann wrote:
> Similarly to 5a52ae4e32a6 ("bpf: Allow to retrieve cgroup v1 classid
> from v2 hooks"), add a helper to retrieve cgroup v1 classid solely
> based on the skb->sk, so it can be used as key as part of BPF map
> lookups out of tc from host ns, in particular given the skb->sk is
> retained these days when crossing net ns thanks to 9c4c325252c5
> ("skbuff: preserve sock reference when scrubbing the skb."). This
> is similar to bpf_skb_cgroup_id() which implements the same for v2.
> Kubernetes ecosystem is still operating on v1 however, hence net_cls
> needs to be used there until this can be dropped in with the v2
> helper of bpf_skb_cgroup_id().
Acked-by: Martin KaFai Lau <>

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