static bool tcf_chain_dump(struct tcf_chain *chain, struct Qdisc *q, u32 parent,
			   struct sk_buff *skb, struct netlink_callback *cb,
			   long index_start, long *p_index, bool terse)
{
	struct net *net = sock_net(skb->sk);
	struct tcf_block *block = chain->block;
	struct tcmsg *tcm = nlmsg_data(cb->nlh);
	struct tcf_proto *tp, *tp_prev;
	struct tcf_dump_args arg;

	for (tp = __tcf_get_next_proto(chain, NULL);
	     tp;
	     tp_prev = tp,
		     tp = __tcf_get_next_proto(chain, tp),
		     tcf_proto_put(tp_prev, true, NULL),
		     (*p_index)++) {
		if (*p_index < index_start)
			continue;
		if (TC_H_MAJ(tcm->tcm_info) &&
		    TC_H_MAJ(tcm->tcm_info) != tp->prio)
			continue;
		if (TC_H_MIN(tcm->tcm_info) &&
		    TC_H_MIN(tcm->tcm_info) != tp->protocol)
			continue;
		if (*p_index > index_start)
			memset(&cb->args[1], 0,
			       sizeof(cb->args) - sizeof(cb->args[0]));
		if (cb->args[1] == 0) {
			if (tcf_fill_node(net, skb, tp, block, q, parent, NULL,
					  NETLINK_CB(cb->skb).portid,
					  cb->nlh->nlmsg_seq, NLM_F_MULTI,
					  RTM_NEWTFILTER, false, true) <= 0)
				goto errout;
			cb->args[1] = 1;
		}
		if (!tp->ops->walk)
			continue;
		arg.w.fn = tcf_node_dump;
		arg.skb = skb;
		arg.cb = cb;
		arg.block = block;
		arg.q = q;
		arg.parent = parent;
		arg.w.stop = 0;
		arg.w.skip = cb->args[1] - 1;
		arg.w.count = 0;
		arg.w.cookie = cb->args[2];
		arg.terse_dump = terse;
		tp->ops->walk(tp, &arg.w, true);
		cb->args[2] = arg.w.cookie;
		cb->args[1] = arg.w.count + 1;
		if (arg.w.stop)
			goto errout;
	}
	return true;

errout:
	tcf_proto_put(tp, true, NULL);
	return false;
}