gre_full_hdr
sizeof_field(struct gre_full_hdr, key)),
offset += sizeof_field(struct gre_full_hdr, csum) +
sizeof_field(struct gre_full_hdr, reserved1);
offset += sizeof_field(struct gre_full_hdr, key);
offset += sizeof_field(struct gre_full_hdr, csum) +
sizeof_field(struct gre_full_hdr, reserved1);
offset += sizeof_field(struct gre_full_hdr, key);
offset += sizeof_field(struct gre_full_hdr, seq);