netdev - Re: [PATCH bpf-next v3 12/16] libbpf: Add support for SK

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Date:   Wed, 8 Jul 2020 21:23:27 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH bpf-next v3 12/16] libbpf: Add support for SK_LOOKUP
 program type

On Thu, Jul 2, 2020 at 2:25 AM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> Make libbpf aware of the newly added program type, and assign it a
> section name.
>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---
>
> Notes:
>     v3:
>     - Move new libbpf symbols to version 0.1.0.
>     - Set expected_attach_type in probe_load for new prog type.
>
>     v2:
>     - Add new libbpf symbols to version 0.0.9. (Andrii)
>
>  tools/lib/bpf/libbpf.c        | 3 +++
>  tools/lib/bpf/libbpf.h        | 2 ++
>  tools/lib/bpf/libbpf.map      | 2 ++
>  tools/lib/bpf/libbpf_probes.c | 3 +++
>  4 files changed, 10 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 4ea7f4f1a691..ddcbb5dd78df 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -6793,6 +6793,7 @@ BPF_PROG_TYPE_FNS(perf_event, BPF_PROG_TYPE_PERF_EVENT);
>  BPF_PROG_TYPE_FNS(tracing, BPF_PROG_TYPE_TRACING);
>  BPF_PROG_TYPE_FNS(struct_ops, BPF_PROG_TYPE_STRUCT_OPS);
>  BPF_PROG_TYPE_FNS(extension, BPF_PROG_TYPE_EXT);
> +BPF_PROG_TYPE_FNS(sk_lookup, BPF_PROG_TYPE_SK_LOOKUP);
>
>  enum bpf_attach_type
>  bpf_program__get_expected_attach_type(struct bpf_program *prog)
> @@ -6969,6 +6970,8 @@ static const struct bpf_sec_def section_defs[] = {
>         BPF_EAPROG_SEC("cgroup/setsockopt",     BPF_PROG_TYPE_CGROUP_SOCKOPT,
>                                                 BPF_CGROUP_SETSOCKOPT),
>         BPF_PROG_SEC("struct_ops",              BPF_PROG_TYPE_STRUCT_OPS),
> +       BPF_EAPROG_SEC("sk_lookup",             BPF_PROG_TYPE_SK_LOOKUP,
> +                                               BPF_SK_LOOKUP),

So it's a BPF_PROG_TYPE_SK_LOOKUP with attach type BPF_SK_LOOKUP. What
other potential attach types could there be for
BPF_PROG_TYPE_SK_LOOKUP? How the section name will look like in that
case?

>  };
>
>  #undef BPF_PROG_SEC_IMPL
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 2335971ed0bd..c2272132e929 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -350,6 +350,7 @@ LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
>  LIBBPF_API int bpf_program__set_tracing(struct bpf_program *prog);
>  LIBBPF_API int bpf_program__set_struct_ops(struct bpf_program *prog);
>  LIBBPF_API int bpf_program__set_extension(struct bpf_program *prog);
> +LIBBPF_API int bpf_program__set_sk_lookup(struct bpf_program *prog);
>
>  LIBBPF_API enum bpf_prog_type bpf_program__get_type(struct bpf_program *prog);
>  LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
> @@ -377,6 +378,7 @@ LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
>  LIBBPF_API bool bpf_program__is_tracing(const struct bpf_program *prog);
>  LIBBPF_API bool bpf_program__is_struct_ops(const struct bpf_program *prog);
>  LIBBPF_API bool bpf_program__is_extension(const struct bpf_program *prog);
> +LIBBPF_API bool bpf_program__is_sk_lookup(const struct bpf_program *prog);
>
>  /*
>   * No need for __attribute__((packed)), all members of 'bpf_map_def'
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 6544d2cd1ed6..04b99f63a45c 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -287,5 +287,7 @@ LIBBPF_0.1.0 {
>                 bpf_map__type;
>                 bpf_map__value_size;
>                 bpf_program__autoload;
> +               bpf_program__is_sk_lookup;
>                 bpf_program__set_autoload;
> +               bpf_program__set_sk_lookup;
>  } LIBBPF_0.0.9;
> diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c
> index 10cd8d1891f5..5a3d3f078408 100644
> --- a/tools/lib/bpf/libbpf_probes.c
> +++ b/tools/lib/bpf/libbpf_probes.c
> @@ -78,6 +78,9 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
>         case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
>                 xattr.expected_attach_type = BPF_CGROUP_INET4_CONNECT;
>                 break;
> +       case BPF_PROG_TYPE_SK_LOOKUP:
> +               xattr.expected_attach_type = BPF_SK_LOOKUP;
> +               break;
>         case BPF_PROG_TYPE_KPROBE:
>                 xattr.kern_version = get_kernel_version();
>                 break;
> --
> 2.25.4
>