pfkey_send_x5
if ((len = pfkey_send_x5(so, SADB_X_SPDDELETE2, spid)) < 0)
if ((len = pfkey_send_x5(so, SADB_X_SPDGET, spid)) < 0)
static int pfkey_send_x5(int, u_int, u_int32_t);