pfkey_send_x2
if ((len = pfkey_send_x2(so, SADB_DELETE, satype, mode, src, dst, spi)) < 0)
static int pfkey_send_x2(int, u_int, u_int, u_int,
if ((len = pfkey_send_x2(so, SADB_GET, satype, mode, src, dst, spi)) < 0)