getph2bysaidx
extern struct ph2handle *getph2bysaidx(struct sockaddr *, struct sockaddr *,
iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi);
iph2 = getph2bysaidx(src, dst, proto, spi[i]);
iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi);
iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi);
iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi);