IPN_DELETE
ipsec->ipsc_rule->in_flags |= IPN_DELETE;
in->in_flags |= IPN_DELETE;
if ((np->in_flags & IPN_DELETE) == 0) {
np->in_flags |= IPN_DELETE;
#define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)
pptp->pptp_rule->in_flags |= IPN_DELETE;
rci->rcmd_rule->in_flags |= IPN_DELETE;
tftp->ti_rule->in_flags |= IPN_DELETE;