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csum: bad encoding  #275

@pabeni

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@pabeni

the current encoding of the csum field in the MPTCP DSS option is wrong: the __sum value is converted to BE, inverting the byte order on LE arches, which is not expected.

@darkwrat confirmed the above causes interoperability issues between hosts with different endianess.

The solution is problematic WRT backward compatibility, but we don't have many options

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