netdev - Re: [PATCH bpf-next 1/7] bpf/flow_dissector: pass input flags to BPF flow dissector program

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAPhsuW6wq_6Pf80yV7oEb0uW7Xv9=UKAbTm4XJLyKAtSmDzCBQ@mail.gmail.com>
Date:   Wed, 24 Jul 2019 15:21:47 -0700
From:   Song Liu <liu.song.a23@...il.com>
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>,
        Willem de Bruijn <willemb@...gle.com>,
        Petar Penkov <ppenkov@...gle.com>
Subject: Re: [PATCH bpf-next 1/7] bpf/flow_dissector: pass input flags to BPF
 flow dissector program

On Wed, Jul 24, 2019 at 10:11 AM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> C flow dissector supports input flags that tell it to customize parsing
> by either stopping early or trying to parse as deep as possible. Pass
> those flags to the BPF flow dissector so it can make the same
> decisions. In the next commits I'll add support for those flags to
> our reference bpf_flow.c
>
> Cc: Willem de Bruijn <willemb@...gle.com>
> Cc: Petar Penkov <ppenkov@...gle.com>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
>  include/linux/skbuff.h       | 2 +-
>  include/net/flow_dissector.h | 4 ----
>  include/uapi/linux/bpf.h     | 5 +++++
>  net/bpf/test_run.c           | 2 +-
>  net/core/flow_dissector.c    | 5 +++--
>  5 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 718742b1c505..9b7a8038beec 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -1271,7 +1271,7 @@ static inline int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
>
>  struct bpf_flow_dissector;
>  bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
> -                     __be16 proto, int nhoff, int hlen);
> +                     __be16 proto, int nhoff, int hlen, unsigned int flags);
>
>  bool __skb_flow_dissect(const struct net *net,
>                         const struct sk_buff *skb,
> diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
> index 90bd210be060..3e2642587b76 100644
> --- a/include/net/flow_dissector.h
> +++ b/include/net/flow_dissector.h
> @@ -253,10 +253,6 @@ enum flow_dissector_key_id {
>         FLOW_DISSECTOR_KEY_MAX,
>  };
>
> -#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG                BIT(0)
> -#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL    BIT(1)
> -#define FLOW_DISSECTOR_F_STOP_AT_ENCAP         BIT(2)
> -
>  struct flow_dissector_key {
>         enum flow_dissector_key_id key_id;
>         size_t offset; /* offset of struct flow_dissector_key_*
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index fa1c753dcdbc..b4ad19bd6aa8 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -3507,6 +3507,10 @@ enum bpf_task_fd_type {
>         BPF_FD_TYPE_URETPROBE,          /* filename + offset */
>  };
>
> +#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG                (1U << 0)
> +#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL    (1U << 1)
> +#define FLOW_DISSECTOR_F_STOP_AT_ENCAP         (1U << 2)

Do we have to move these?

Thanks,
Song