netdev - Re: [PATCH bpf 0/5] flow_dissector: lay groundwork for calling BPF hook from eth_get

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Message-ID: <CAF=yD-JOZuJ4cg30Gcx-RU2KHZ5iy6gJ=okhVbcNybRkqRY+dw@mail.gmail.com>
Date:   Tue, 2 Apr 2019 16:17:28 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, David Miller <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Simon Horman <simon.horman@...ronome.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Petar Penkov <peterpenkov96@...il.com>
Subject: Re: [PATCH bpf 0/5] flow_dissector: lay groundwork for calling BPF
 hook from eth_get_headlen

On Mon, Apr 1, 2019 at 4:57 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> This patch series fixes the existing BPF flow dissector API to
> support calling BPF progs from the eth_get_headlen context (the support
> itself will be added in bpf-next tree).
>
> The summary of the changes:
>   * fix VLAN handling in bpf_flow.c, we don't need to peek back and look
>     at skb->vlan_present; add selftests
>   * pass and use flow_keys->n_proto instead of skb->protocol
>   * fix clamping of flow_keys->nhoff for packets with nhoff > 0
>   * prohibit access to most of the __sk_buff fields from BPF flow
>     dissector progs; only data/data_end/flow_keys are allowed (all input
>     is now passed via flow_keys)
>   * finally, document BPF flow dissector program environment
>
> Stanislav Fomichev (5):
>   selftests/bpf: fix vlan handling in flow dissector program
>   net/flow_dissector: pass flow_keys->n_proto to BPF programs
>   flow_dissector: fix clamping of BPF flow_keys for non-zero nhoff
>   flow_dissector: allow access only to a subset of __sk_buff fields
>   flow_dissector: document BPF flow dissector environment

For the series:

Acked-by: Willem de Bruijn <willemb@...gle.com>

This looks great to me. Thanks, Stan!

>
>  .../networking/bpf_flow_dissector.txt         | 115 ++++++++++++++++++
>  net/core/filter.c                             |  16 +--
>  net/core/flow_dissector.c                     |   4 +-
>  .../selftests/bpf/prog_tests/flow_dissector.c |  68 +++++++++++
>  tools/testing/selftests/bpf/progs/bpf_flow.c  |  19 ++-
>  5 files changed, 196 insertions(+), 26 deletions(-)
>  create mode 100644 Documentation/networking/bpf_flow_dissector.txt
>
> --
> 2.21.0.392.gf8f6787159e-goog