netdev - Re: [PATCH bpf-next v7 05/11] bpf: implement BPF_PROG_QUERY for BPF_LSM

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Date:   Mon, 23 May 2022 16:23:59 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH bpf-next v7 05/11] bpf: implement BPF_PROG_QUERY for BPF_LSM_CGROUP

On Wed, May 18, 2022 at 3:55 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> We have two options:
> 1. Treat all BPF_LSM_CGROUP the same, regardless of attach_btf_id
> 2. Treat BPF_LSM_CGROUP+attach_btf_id as a separate hook point
>
> I was doing (2) in the original patch, but switching to (1) here:
>
> * bpf_prog_query returns all attached BPF_LSM_CGROUP programs
> regardless of attach_btf_id
> * attach_btf_id is exported via bpf_prog_info
>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
>  include/uapi/linux/bpf.h |   5 ++
>  kernel/bpf/cgroup.c      | 103 +++++++++++++++++++++++++++------------
>  kernel/bpf/syscall.c     |   4 +-
>  3 files changed, 81 insertions(+), 31 deletions(-)
>
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index b9d2d6de63a7..432fc5f49567 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -1432,6 +1432,7 @@ union bpf_attr {
>                 __u32           attach_flags;
>                 __aligned_u64   prog_ids;
>                 __u32           prog_cnt;
> +               __aligned_u64   prog_attach_flags; /* output: per-program attach_flags */
>         } query;
>
>         struct { /* anonymous struct used by BPF_RAW_TRACEPOINT_OPEN command */
> @@ -5911,6 +5912,10 @@ struct bpf_prog_info {
>         __u64 run_cnt;
>         __u64 recursion_misses;
>         __u32 verified_insns;
> +       /* BTF ID of the function to attach to within BTF object identified
> +        * by btf_id.
> +        */
> +       __u32 attach_btf_func_id;

it's called attach_btf_id for PROG_LOAD command, keep it consistently
named (and a bit more generic)?

>  } __attribute__((aligned(8)));
>
>  struct bpf_map_info {

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