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@xxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
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