netdev - Re: [PATCH bpf-next v2 1/2] bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_SOCK

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Date:   Wed, 18 Aug 2021 10:49:10 -0700
From:   Song Liu <song@...nel.org>
To:     Xu Liu <liuxu623@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 1/2] bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_SOCK_OPS

On Wed, Aug 18, 2021 at 4:00 AM Xu Liu <liuxu623@...il.com> wrote:
>
> We'd like to be able to identify netns from sockops hooks
> to accelerate local process communication form different netns.
>
> Signed-off-by: Xu Liu <liuxu623@...il.com>

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

> ---
>  net/core/filter.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/net/core/filter.c b/net/core/filter.c
> index d70187ce851b..34938a537931 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -4664,6 +4664,18 @@ static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = {
>         .arg1_type      = ARG_PTR_TO_CTX_OR_NULL,
>  };
>
> +BPF_CALL_1(bpf_get_netns_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
> +{
> +       return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);
> +}
> +
> +static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = {
> +       .func           = bpf_get_netns_cookie_sock_ops,
> +       .gpl_only       = false,
> +       .ret_type       = RET_INTEGER,
> +       .arg1_type      = ARG_PTR_TO_CTX_OR_NULL,
> +};
> +
>  BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
>  {
>         struct sock *sk = sk_to_full_sk(skb->sk);
> @@ -7445,6 +7457,8 @@ sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
>                 return &bpf_sk_storage_get_proto;
>         case BPF_FUNC_sk_storage_delete:
>                 return &bpf_sk_storage_delete_proto;
> +       case BPF_FUNC_get_netns_cookie:
> +               return &bpf_get_netns_cookie_sock_ops_proto;
>  #ifdef CONFIG_INET
>         case BPF_FUNC_load_hdr_opt:
>                 return &bpf_sock_ops_load_hdr_opt_proto;
> --
> 2.28.0
>