1 files changed, 372 insertions, 0 deletions
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
new file mode 100644
index 0000000000..a463a63192
--- /dev/null
+++ b/net/sched/sch_ingress.c
@@ -0,0 +1,372 @@
+// 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,
+};
+
+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,
+};
+
+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_ALIAS("sch_clsact");
+MODULE_LICENSE("GPL");