IPPF_FRAGHDR
if (fields & IPPF_FRAGHDR) {
dst->ipp_fields |= IPPF_FRAGHDR;
if (!(ipp->ipp_fields & IPPF_FRAGHDR)) {
ipp->ipp_fields |= IPPF_FRAGHDR;
#define IS_V6_FRAGMENT(ipp) (ipp.ipp_fields & IPPF_FRAGHDR)
if (!(ipp.ipp_fields & IPPF_FRAGHDR)) {