net/sched/sch_ingress.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /* net/sched/sch_ingress.c - Ingress and clsact qdisc
  *
  * Authors:     Jamal Hadi Salim 1999
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/skbuff.h>
 #include <linux/rtnetlink.h>

 #include <net/netlink.h>
 #include <net/pkt_sched.h>
 #include <net/pkt_cls.h>
 #include <net/tcx.h>

 struct ingress_sched_data {
 	struct tcf_block *block;
 	struct tcf_block_ext_info block_info;
 	struct mini_Qdisc_pair miniqp;
 };

 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
 {
 	return NULL;
 }

 static unsigned long ingress_find(struct Qdisc *sch, u32 classid)
 {
 	return TC_H_MIN(classid) + 1;
 }

 static unsigned long ingress_bind_filter(struct Qdisc *sch,
 					 unsigned long parent, u32 classid)
 {
 	return ingress_find(sch, classid);
 }

 static void ingress_unbind_filter(struct Qdisc *sch, unsigned long cl)
 {
 }

 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 {
 }

 static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl,
 					   struct netlink_ext_ack *extack)
 {
 	struct ingress_sched_data *q = qdisc_priv(sch);

 	return q->block;
 }

 static void clsact_chain_head_change(struct tcf_proto *tp_head, void *priv)
 {
 	struct mini_Qdisc_pair *miniqp = priv;

 	mini_qdisc_pair_swap(miniqp, tp_head);
 };

 static void ingress_ingress_block_set(struct Qdisc *sch, u32 block_index)
 {
 	struct ingress_sched_data *q = qdisc_priv(sch);

 	q->block_info.block_index = block_index;
 }

 static u32 ingress_ingress_block_get(struct Qdisc *sch)
 {
 	struct ingress_sched_data *q = qdisc_priv(sch);

 	return q->block_info.block_index;
 }

 static int ingress_init(struct Qdisc *sch, struct nlattr *opt,
 			struct netlink_ext_ack *extack)
 {
 	struct ingress_sched_data *q = qdisc_priv(sch);
 	struct net_device *dev = qdisc_dev(sch);
 	struct bpf_mprog_entry *entry;
 	bool created;
 	int err;

 	if (sch->parent != TC_H_INGRESS)
 		return -EOPNOTSUPP;

 	net_inc_ingress_queue();

 	entry = tcx_entry_fetch_or_create(dev, true, &created);
 	if (!entry)
 		return -ENOMEM;
 	tcx_miniq_set_active(entry, true);
 	mini_qdisc_pair_init(&q->miniqp, sch, &tcx_entry(entry)->miniq);
 	if (created)
 		tcx_entry_update(dev, entry, true);

 	q->block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
 	q->block_info.chain_head_change = clsact_chain_head_change;
 	q->block_info.chain_head_change_priv = &q->miniqp;

 	err = tcf_block_get_ext(&q->block, sch, &q->block_info, extack);
 	if (err)
 		return err;

 	mini_qdisc_pair_block_init(&q->miniqp, q->block);

 	return 0;
 }

 static void ingress_destroy(struct Qdisc *sch)
 {
 	struct ingress_sched_data *q = qdisc_priv(sch);
 	struct net_device *dev = qdisc_dev(sch);
 	struct bpf_mprog_entry *entry = rtnl_dereference(dev->tcx_ingress);

 	if (sch->parent != TC_H_INGRESS)
 		return;

 	tcf_block_put_ext(q->block, sch, &q->block_info);

 	if (entry) {
 		tcx_miniq_set_active(entry, false);
 		if (!tcx_entry_is_active(entry)) {
 			tcx_entry_update(dev, NULL, true);
 			tcx_entry_free(entry);
 		}
 	}

 	net_dec_ingress_queue();
 }

 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
 {
 	struct nlattr *nest;

 	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
 	if (nest == NULL)
 		goto nla_put_failure;

 	return nla_nest_end(skb, nest);

 nla_put_failure:
 	nla_nest_cancel(skb, nest);
 	return -1;
 }

 static const struct Qdisc_class_ops ingress_class_ops = {
 	.flags		=	QDISC_CLASS_OPS_DOIT_UNLOCKED,
 	.leaf		=	ingress_leaf,
 	.find		=	ingress_find,
 	.walk		=	ingress_walk,
 	.tcf_block	=	ingress_tcf_block,
 	.bind_tcf	=	ingress_bind_filter,
 	.unbind_tcf	=	ingress_unbind_filter,
 };

 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
 	.cl_ops			=	&ingress_class_ops,
 	.id			=	"ingress",
 	.priv_size		=	sizeof(struct ingress_sched_data),
 	.static_flags		=	TCQ_F_INGRESS | TCQ_F_CPUSTATS,
 	.init			=	ingress_init,
 	.destroy		=	ingress_destroy,
 	.dump			=	ingress_dump,
 	.ingress_block_set	=	ingress_ingress_block_set,
 	.ingress_block_get	=	ingress_ingress_block_get,
 	.owner			=	THIS_MODULE,
 };
 MODULE_ALIAS_NET_SCH("ingress");

 struct clsact_sched_data {
 	struct tcf_block *ingress_block;
 	struct tcf_block *egress_block;
 	struct tcf_block_ext_info ingress_block_info;
 	struct tcf_block_ext_info egress_block_info;
 	struct mini_Qdisc_pair miniqp_ingress;
 	struct mini_Qdisc_pair miniqp_egress;
 };

 static unsigned long clsact_find(struct Qdisc *sch, u32 classid)
 {
 	switch (TC_H_MIN(classid)) {
 	case TC_H_MIN(TC_H_MIN_INGRESS):
 	case TC_H_MIN(TC_H_MIN_EGRESS):
 		return TC_H_MIN(classid);
 	default:
 		return 0;
 	}
 }

 static unsigned long clsact_bind_filter(struct Qdisc *sch,
 					unsigned long parent, u32 classid)
 {
 	return clsact_find(sch, classid);
 }

 static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl,
 					  struct netlink_ext_ack *extack)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);

 	switch (cl) {
 	case TC_H_MIN(TC_H_MIN_INGRESS):
 		return q->ingress_block;
 	case TC_H_MIN(TC_H_MIN_EGRESS):
 		return q->egress_block;
 	default:
 		return NULL;
 	}
 }

 static void clsact_ingress_block_set(struct Qdisc *sch, u32 block_index)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);

 	q->ingress_block_info.block_index = block_index;
 }

 static void clsact_egress_block_set(struct Qdisc *sch, u32 block_index)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);

 	q->egress_block_info.block_index = block_index;
 }

 static u32 clsact_ingress_block_get(struct Qdisc *sch)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);

 	return q->ingress_block_info.block_index;
 }

 static u32 clsact_egress_block_get(struct Qdisc *sch)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);

 	return q->egress_block_info.block_index;
 }

 static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
 		       struct netlink_ext_ack *extack)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);
 	struct net_device *dev = qdisc_dev(sch);
 	struct bpf_mprog_entry *entry;
 	bool created;
 	int err;

 	if (sch->parent != TC_H_CLSACT)
 		return -EOPNOTSUPP;

 	net_inc_ingress_queue();
 	net_inc_egress_queue();

 	entry = tcx_entry_fetch_or_create(dev, true, &created);
 	if (!entry)
 		return -ENOMEM;
 	tcx_miniq_set_active(entry, true);
 	mini_qdisc_pair_init(&q->miniqp_ingress, sch, &tcx_entry(entry)->miniq);
 	if (created)
 		tcx_entry_update(dev, entry, true);

 	q->ingress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
 	q->ingress_block_info.chain_head_change = clsact_chain_head_change;
 	q->ingress_block_info.chain_head_change_priv = &q->miniqp_ingress;

 	err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info,
 				extack);
 	if (err)
 		return err;

 	mini_qdisc_pair_block_init(&q->miniqp_ingress, q->ingress_block);

 	entry = tcx_entry_fetch_or_create(dev, false, &created);
 	if (!entry)
 		return -ENOMEM;
 	tcx_miniq_set_active(entry, true);
 	mini_qdisc_pair_init(&q->miniqp_egress, sch, &tcx_entry(entry)->miniq);
 	if (created)
 		tcx_entry_update(dev, entry, false);

 	q->egress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS;
 	q->egress_block_info.chain_head_change = clsact_chain_head_change;
 	q->egress_block_info.chain_head_change_priv = &q->miniqp_egress;

 	return tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info, extack);
 }

 static void clsact_destroy(struct Qdisc *sch)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);
 	struct net_device *dev = qdisc_dev(sch);
 	struct bpf_mprog_entry *ingress_entry = rtnl_dereference(dev->tcx_ingress);
 	struct bpf_mprog_entry *egress_entry = rtnl_dereference(dev->tcx_egress);

 	if (sch->parent != TC_H_CLSACT)
 		return;

 	tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
 	tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);

 	if (ingress_entry) {
 		tcx_miniq_set_active(ingress_entry, false);
 		if (!tcx_entry_is_active(ingress_entry)) {
 			tcx_entry_update(dev, NULL, true);
 			tcx_entry_free(ingress_entry);
 		}
 	}

 	if (egress_entry) {
 		tcx_miniq_set_active(egress_entry, false);
 		if (!tcx_entry_is_active(egress_entry)) {
 			tcx_entry_update(dev, NULL, false);
 			tcx_entry_free(egress_entry);
 		}
 	}

 	net_dec_ingress_queue();
 	net_dec_egress_queue();
 }

 static const struct Qdisc_class_ops clsact_class_ops = {
 	.flags		=	QDISC_CLASS_OPS_DOIT_UNLOCKED,
 	.leaf		=	ingress_leaf,
 	.find		=	clsact_find,
 	.walk		=	ingress_walk,
 	.tcf_block	=	clsact_tcf_block,
 	.bind_tcf	=	clsact_bind_filter,
 	.unbind_tcf	=	ingress_unbind_filter,
 };

 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
 	.cl_ops			=	&clsact_class_ops,
 	.id			=	"clsact",
 	.priv_size		=	sizeof(struct clsact_sched_data),
 	.static_flags		=	TCQ_F_INGRESS | TCQ_F_CPUSTATS,
 	.init			=	clsact_init,
 	.destroy		=	clsact_destroy,
 	.dump			=	ingress_dump,
 	.ingress_block_set	=	clsact_ingress_block_set,
 	.egress_block_set	=	clsact_egress_block_set,
 	.ingress_block_get	=	clsact_ingress_block_get,
 	.egress_block_get	=	clsact_egress_block_get,
 	.owner			=	THIS_MODULE,
 };
 MODULE_ALIAS_NET_SCH("clsact");

 static int __init ingress_module_init(void)
 {
 	int ret;

 	ret = register_qdisc(&ingress_qdisc_ops);
 	if (!ret) {
 		ret = register_qdisc(&clsact_qdisc_ops);
 		if (ret)
 			unregister_qdisc(&ingress_qdisc_ops);
 	}

 	return ret;
 }

 static void __exit ingress_module_exit(void)
 {
 	unregister_qdisc(&ingress_qdisc_ops);
 	unregister_qdisc(&clsact_qdisc_ops);
 }

 module_init(ingress_module_init);
 module_exit(ingress_module_exit);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Ingress and clsact based ingress and egress qdiscs");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/* net/sched/sch_ingress.c - Ingress and clsact qdisc
	*
	* Authors: Jamal Hadi Salim 1999
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/list.h>
	#include <linux/skbuff.h>
	#include <linux/rtnetlink.h>

	#include <net/netlink.h>
	#include <net/pkt_sched.h>
	#include <net/pkt_cls.h>
	#include <net/tcx.h>

	struct ingress_sched_data {
	struct tcf_block *block;
	struct tcf_block_ext_info block_info;
	struct mini_Qdisc_pair miniqp;
	};

	static struct Qdisc ingress_leaf(struct Qdisc sch, unsigned long arg)
	{
	return NULL;
	}

	static unsigned long ingress_find(struct Qdisc *sch, u32 classid)
	{
	return TC_H_MIN(classid) + 1;
	}

	static unsigned long ingress_bind_filter(struct Qdisc *sch,
	unsigned long parent, u32 classid)
	{
	return ingress_find(sch, classid);
	}

	static void ingress_unbind_filter(struct Qdisc *sch, unsigned long cl)
	{
	}

	static void ingress_walk(struct Qdisc sch, struct qdisc_walker walker)
	{
	}

	static struct tcf_block ingress_tcf_block(struct Qdisc sch, unsigned long cl,
	struct netlink_ext_ack *extack)
	{
	struct ingress_sched_data *q = qdisc_priv(sch);

	return q->block;
	}

	static void clsact_chain_head_change(struct tcf_proto tp_head, void priv)
	{
	struct mini_Qdisc_pair *miniqp = priv;

	mini_qdisc_pair_swap(miniqp, tp_head);
	};

	static void ingress_ingress_block_set(struct Qdisc *sch, u32 block_index)
	{
	struct ingress_sched_data *q = qdisc_priv(sch);

	q->block_info.block_index = block_index;
	}

	static u32 ingress_ingress_block_get(struct Qdisc *sch)
	{
	struct ingress_sched_data *q = qdisc_priv(sch);

	return q->block_info.block_index;
	}

	static int ingress_init(struct Qdisc sch, struct nlattr opt,
	struct netlink_ext_ack *extack)
	{
	struct ingress_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *entry;
	bool created;
	int err;

	if (sch->parent != TC_H_INGRESS)
	return -EOPNOTSUPP;

	net_inc_ingress_queue();

	entry = tcx_entry_fetch_or_create(dev, true, &created);
	if (!entry)
	return -ENOMEM;
	tcx_miniq_set_active(entry, true);
	mini_qdisc_pair_init(&q->miniqp, sch, &tcx_entry(entry)->miniq);
	if (created)
	tcx_entry_update(dev, entry, true);

	q->block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
	q->block_info.chain_head_change = clsact_chain_head_change;
	q->block_info.chain_head_change_priv = &q->miniqp;

	err = tcf_block_get_ext(&q->block, sch, &q->block_info, extack);
	if (err)
	return err;

	mini_qdisc_pair_block_init(&q->miniqp, q->block);

	return 0;
	}

	static void ingress_destroy(struct Qdisc *sch)
	{
	struct ingress_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *entry = rtnl_dereference(dev->tcx_ingress);

	if (sch->parent != TC_H_INGRESS)
	return;

	tcf_block_put_ext(q->block, sch, &q->block_info);

	if (entry) {
	tcx_miniq_set_active(entry, false);
	if (!tcx_entry_is_active(entry)) {
	tcx_entry_update(dev, NULL, true);
	tcx_entry_free(entry);
	}
	}

	net_dec_ingress_queue();
	}

	static int ingress_dump(struct Qdisc sch, struct sk_buff skb)
	{
	struct nlattr *nest;

	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
	if (nest == NULL)
	goto nla_put_failure;

	return nla_nest_end(skb, nest);

	nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
	}

	static const struct Qdisc_class_ops ingress_class_ops = {
	.flags = QDISC_CLASS_OPS_DOIT_UNLOCKED,
	.leaf = ingress_leaf,
	.find = ingress_find,
	.walk = ingress_walk,
	.tcf_block = ingress_tcf_block,
	.bind_tcf = ingress_bind_filter,
	.unbind_tcf = ingress_unbind_filter,
	};

	static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
	.cl_ops = &ingress_class_ops,
	.id = "ingress",
	.priv_size = sizeof(struct ingress_sched_data),
	.static_flags = TCQ_F_INGRESS \| TCQ_F_CPUSTATS,
	.init = ingress_init,
	.destroy = ingress_destroy,
	.dump = ingress_dump,
	.ingress_block_set = ingress_ingress_block_set,
	.ingress_block_get = ingress_ingress_block_get,
	.owner = THIS_MODULE,
	};
	MODULE_ALIAS_NET_SCH("ingress");

	struct clsact_sched_data {
	struct tcf_block *ingress_block;
	struct tcf_block *egress_block;
	struct tcf_block_ext_info ingress_block_info;
	struct tcf_block_ext_info egress_block_info;
	struct mini_Qdisc_pair miniqp_ingress;
	struct mini_Qdisc_pair miniqp_egress;
	};

	static unsigned long clsact_find(struct Qdisc *sch, u32 classid)
	{
	switch (TC_H_MIN(classid)) {
	case TC_H_MIN(TC_H_MIN_INGRESS):
	case TC_H_MIN(TC_H_MIN_EGRESS):
	return TC_H_MIN(classid);
	default:
	return 0;
	}
	}

	static unsigned long clsact_bind_filter(struct Qdisc *sch,
	unsigned long parent, u32 classid)
	{
	return clsact_find(sch, classid);
	}

	static struct tcf_block clsact_tcf_block(struct Qdisc sch, unsigned long cl,
	struct netlink_ext_ack *extack)
	{
	struct clsact_sched_data *q = qdisc_priv(sch);

	switch (cl) {
	case TC_H_MIN(TC_H_MIN_INGRESS):
	return q->ingress_block;
	case TC_H_MIN(TC_H_MIN_EGRESS):
	return q->egress_block;
	default:
	return NULL;
	}
	}

	static void clsact_ingress_block_set(struct Qdisc *sch, u32 block_index)
	{
	struct clsact_sched_data *q = qdisc_priv(sch);

	q->ingress_block_info.block_index = block_index;
	}

	static void clsact_egress_block_set(struct Qdisc *sch, u32 block_index)
	{
	struct clsact_sched_data *q = qdisc_priv(sch);

	q->egress_block_info.block_index = block_index;
	}

	static u32 clsact_ingress_block_get(struct Qdisc *sch)
	{
	struct clsact_sched_data *q = qdisc_priv(sch);

	return q->ingress_block_info.block_index;
	}

	static u32 clsact_egress_block_get(struct Qdisc *sch)
	{
	struct clsact_sched_data *q = qdisc_priv(sch);

	return q->egress_block_info.block_index;
	}

	static int clsact_init(struct Qdisc sch, struct nlattr opt,
	struct netlink_ext_ack *extack)
	{
	struct clsact_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *entry;
	bool created;
	int err;

	if (sch->parent != TC_H_CLSACT)
	return -EOPNOTSUPP;

	net_inc_ingress_queue();
	net_inc_egress_queue();

	entry = tcx_entry_fetch_or_create(dev, true, &created);
	if (!entry)
	return -ENOMEM;
	tcx_miniq_set_active(entry, true);
	mini_qdisc_pair_init(&q->miniqp_ingress, sch, &tcx_entry(entry)->miniq);
	if (created)
	tcx_entry_update(dev, entry, true);

	q->ingress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
	q->ingress_block_info.chain_head_change = clsact_chain_head_change;
	q->ingress_block_info.chain_head_change_priv = &q->miniqp_ingress;

	err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info,
	extack);
	if (err)
	return err;

	mini_qdisc_pair_block_init(&q->miniqp_ingress, q->ingress_block);

	entry = tcx_entry_fetch_or_create(dev, false, &created);
	if (!entry)
	return -ENOMEM;
	tcx_miniq_set_active(entry, true);
	mini_qdisc_pair_init(&q->miniqp_egress, sch, &tcx_entry(entry)->miniq);
	if (created)
	tcx_entry_update(dev, entry, false);

	q->egress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS;
	q->egress_block_info.chain_head_change = clsact_chain_head_change;
	q->egress_block_info.chain_head_change_priv = &q->miniqp_egress;

	return tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info, extack);
	}

	static void clsact_destroy(struct Qdisc *sch)
	{
	struct clsact_sched_data *q = qdisc_priv(sch);
	struct net_device *dev = qdisc_dev(sch);
	struct bpf_mprog_entry *ingress_entry = rtnl_dereference(dev->tcx_ingress);
	struct bpf_mprog_entry *egress_entry = rtnl_dereference(dev->tcx_egress);

	if (sch->parent != TC_H_CLSACT)
	return;

	tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
	tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);

	if (ingress_entry) {
	tcx_miniq_set_active(ingress_entry, false);
	if (!tcx_entry_is_active(ingress_entry)) {
	tcx_entry_update(dev, NULL, true);
	tcx_entry_free(ingress_entry);
	}
	}

	if (egress_entry) {
	tcx_miniq_set_active(egress_entry, false);
	if (!tcx_entry_is_active(egress_entry)) {
	tcx_entry_update(dev, NULL, false);
	tcx_entry_free(egress_entry);
	}
	}

	net_dec_ingress_queue();
	net_dec_egress_queue();
	}

	static const struct Qdisc_class_ops clsact_class_ops = {
	.flags = QDISC_CLASS_OPS_DOIT_UNLOCKED,
	.leaf = ingress_leaf,
	.find = clsact_find,
	.walk = ingress_walk,
	.tcf_block = clsact_tcf_block,
	.bind_tcf = clsact_bind_filter,
	.unbind_tcf = ingress_unbind_filter,
	};

	static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
	.cl_ops = &clsact_class_ops,
	.id = "clsact",
	.priv_size = sizeof(struct clsact_sched_data),
	.static_flags = TCQ_F_INGRESS \| TCQ_F_CPUSTATS,
	.init = clsact_init,
	.destroy = clsact_destroy,
	.dump = ingress_dump,
	.ingress_block_set = clsact_ingress_block_set,
	.egress_block_set = clsact_egress_block_set,
	.ingress_block_get = clsact_ingress_block_get,
	.egress_block_get = clsact_egress_block_get,
	.owner = THIS_MODULE,
	};
	MODULE_ALIAS_NET_SCH("clsact");

	static int __init ingress_module_init(void)
	{
	int ret;

	ret = register_qdisc(&ingress_qdisc_ops);
	if (!ret) {
	ret = register_qdisc(&clsact_qdisc_ops);
	if (ret)
	unregister_qdisc(&ingress_qdisc_ops);
	}

	return ret;
	}

	static void __exit ingress_module_exit(void)
	{
	unregister_qdisc(&ingress_qdisc_ops);
	unregister_qdisc(&clsact_qdisc_ops);
	}

	module_init(ingress_module_init);
	module_exit(ingress_module_exit);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Ingress and clsact based ingress and egress qdiscs");