netdev - Re: [PATCH bpf-next 1/2] bpf: expose socket storage to BPF_PROG_TYPE_CGROUP

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Date:   Tue, 28 Jul 2020 23:11:11 -0700
From:   Song Liu <song@...nel.org>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH bpf-next 1/2] bpf: expose socket storage to BPF_PROG_TYPE_CGROUP_SOCK

On Tue, Jul 28, 2020 at 5:31 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> This lets us use socket storage from the following hooks:
> * BPF_CGROUP_INET_SOCK_CREATE
> * BPF_CGROUP_INET_SOCK_RELEASE
> * BPF_CGROUP_INET4_POST_BIND
> * BPF_CGROUP_INET6_POST_BIND
>
> Using existing 'bpf_sk_storage_get_proto' doesn't work because
> second argument is ARG_PTR_TO_SOCKET. Even though
> BPF_PROG_TYPE_CGROUP_SOCK hooks operate on 'struct bpf_sock',
> the verifier still considers it as a PTR_TO_CTX.
> That's why I'm adding another 'bpf_sk_storage_get_cg_sock_proto'
> definition strictly for BPF_PROG_TYPE_CGROUP_SOCK which accepts
> ARG_PTR_TO_CTX which is really 'struct sock' for this program type.
>
> Cc: Martin KaFai Lau <kafai@...com>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>

Acked-by: Song Liu <songliubraving@...com>