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In the bpf_l4_csum_replace helper, the BPF_F_PSEUDO_HDR flag should only be set if the modified header field is part of the pseudo-header. If you modify for example the UDP ports and pass BPF_F_PSEUDO_HDR, inet_proto_csum_replace4 will update skb->csum even though it shouldn't (the port and the UDP checksum updates null each other). Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com> Link: https://lore.kernel.org/r/5126ef84ba75425b689482cbc98bffe75e5d8ab0.1744102490.git.paul.chaignon@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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