netdev - Re: [PATCH net-next] tc: bpf: add checksum helpers

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Date:	Thu, 02 Apr 2015 17:00:47 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	Jiri Pirko <jiri@...nulli.us>, Jamal Hadi Salim <jhs@...atatu.com>,
	linux-api@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tc: bpf: add checksum helpers

On 04/02/2015 02:12 AM, Alexei Starovoitov wrote:
> Commit 608cd71a9c7c ("tc: bpf: generalize pedit action") has added the
> possibility to mangle packet data to BPF programs in the tc pipeline.
> This patch adds two helpers bpf_l3_csum_replace() and bpf_l4_csum_replace()
> for fixing up the protocol checksums after the packet mangling.
>
> It also adds 'flags' argument to bpf_skb_store_bytes() helper to avoid
> unnecessary checksum recomputations when BPF programs adjusting l3/l4
> checksums and documents all three helpers in uapi header.
>
> Moreover, a sample program is added to show how BPF programs can make use
> of the mangle and csum helpers.
>
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>

I think in future we need to find a better place for these helpers,
as they are for cls_bpf and act_bpf.

Acked-by: Daniel Borkmann <daniel@...earbox.net>
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