sen_direction
dir = ipa->ipa_info.sen_direction;
sp->sadb_protocol_direction = ipa->ipa_info.sen_direction;
flow->sen_direction = ftype->sadb_protocol_direction;
flowmask->sen_direction = 0xff;
sab->sadb_protocol_direction = flow->sen_direction;
ddst->sen_direction = direction;
ipa->ipa_info.sen_direction = ipo->ipo_addr.sen_direction;
ipa->ipa_mask.sen_direction = ipo->ipo_mask.sen_direction;