get_proppair
pair = get_proppair(iph2->sa_ret, IPSECDOI_TYPE_PH2);
pair = get_proppair(sa0, IPSECDOI_TYPE_PH2);
rpair = get_proppair(iph2->sa_ret, IPSECDOI_TYPE_PH2);
extern struct prop_pair **get_proppair(vchar_t *, int);
pair = get_proppair(iph2->sa, IPSECDOI_TYPE_PH2);