ETHER_HEADER_COPY
ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
ETHER_HEADER_COPY(mtod(m, void *), eh);
ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));