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rtnetlink has variety of ops with different fixed headers. Detect that op fixed header is not the same as family one, and use sizeof() directly. For reverse parsing we need to pass the fixed header len along the policy (in the socket state). Reviewed-by: Donald Hunter <donald.hunter@gmail.com> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Link: https://patch.msgid.link/20250429154704.2613851-13-kuba@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>