netdev - Re: [PATCH bpf 0/3] Fix csum unnecessary on bpf_skb_adjust

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Message-ID: <CAADnVQLFB1Y9PP3NtZvrFRyRTsTW=nHuGOhqYqC+mgghfh4rEQ@mail.gmail.com>
Date:   Tue, 2 Jun 2020 11:59:30 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Lorenz Bauer <lmb@...udflare.com>,
        Alan Maguire <alan.maguire@...cle.com>,
        bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf 0/3] Fix csum unnecessary on bpf_skb_adjust_room

On Tue, Jun 2, 2020 at 7:58 AM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> This series fixes an issue originally reported by Lorenz Bauer where using
> the bpf_skb_adjust_room() helper hid a checksum bug since it wasn't adjusting
> CHECKSUM_UNNECESSARY's skb->csum_level after decap. The fix is two-fold:
>  i) We do a safe reset in bpf_skb_adjust_room() to CHECKSUM_NONE with an opt-
>     out flag BPF_F_ADJ_ROOM_NO_CSUM_RESET.
> ii) We add a new bpf_csum_level() for the latter in order to allow users to
>     manually inc/dec the skb->csum_level when needed.
> The series is rebased against latest bpf-next tree. It can be applied there,
> or to bpf after the merge win sync from net-next.

Applied. Thanks