On 04/02/2015 05:15 PM, Jiri Pirko wrote:
Thu, Apr 02, 2015 at 05:00:47PM CEST, daniel@xxxxxxxxxxxxx wrote:
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.
Yeah, makes sense to now have it in net/core/filter.c. How about to
create net/bpf dir for these?
I was thinking somewhere under net/sched/, f.e. net/sched/bpf.c
as probably kernel/bpf/ would end up in too much ifdef pasta. :/
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