Daniel Borkmann 2f72959a9c
bpf: fix csum update in bpf_l4_csum_replace helper for udp ...
When using this helper for updating UDP checksums, we need to extend
this in order to write CSUM_MANGLED_0 for csum computations that result
into 0 as sum. Reason we need this is because packets with a checksum
could otherwise become incorrectly marked as a packet without a checksum.
Likewise, if the user indicates BPF_F_MARK_MANGLED_0, then we should
not turn packets without a checksum into ones with a checksum.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net >
Acked-by: Alexei Starovoitov <ast@kernel.org >
Signed-off-by: David S. Miller <davem@davemloft.net >
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2f72959a9c