xfrm_state_flush
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
xfrm_state_flush(net, 0, false);
err = xfrm_state_flush(net, proto, true);
xfrm_state_flush(net, 0, false);
EXPORT_SYMBOL(xfrm_state_flush);
err = xfrm_state_flush(net, p->proto, true);