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authorAlexei Starovoitov <ast@plumgrid.com>2015-04-01 17:12:13 -0700
committerDavid S. Miller <davem@davemloft.net>2015-04-06 16:42:35 -0400
commit91bc4822c3d61b9bb7ef66d3b77948a4f9177954 (patch)
treeca92a811b501957c1e876290d305aaf81c8d9aff /drivers
parent5888b93b750609680735d6b8b737703083ef40ff (diff)
tc: bpf: add checksum helpers
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@plumgrid.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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