From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 net/sched/sch_ingress.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 net/sched/sch_ingress.c

(limited to 'net/sched/sch_ingress.c')

diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
new file mode 100644
index 000000000..4cdbfb856
--- /dev/null
+++ b/net/sched/sch_ingress.c
@@ -0,0 +1,153 @@
+/* net/sched/sch_ingress.c - Ingress qdisc
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ *
+ * 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>
+
+
+struct ingress_qdisc_data {
+	struct tcf_proto __rcu	*filter_list;
+};
+
+/* ------------------------- Class/flow operations ------------------------- */
+
+static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
+{
+	return NULL;
+}
+
+static unsigned long ingress_get(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_get(sch, classid);
+}
+
+static void ingress_put(struct Qdisc *sch, unsigned long cl)
+{
+}
+
+static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
+{
+}
+
+static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch,
+						 unsigned long cl)
+{
+	struct ingress_qdisc_data *p = qdisc_priv(sch);
+
+	return &p->filter_list;
+}
+
+/* --------------------------- Qdisc operations ---------------------------- */
+
+static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
+{
+	struct ingress_qdisc_data *p = qdisc_priv(sch);
+	struct tcf_result res;
+	struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
+	int result;
+
+	result = tc_classify(skb, fl, &res);
+
+	qdisc_bstats_update(sch, skb);
+	switch (result) {
+	case TC_ACT_SHOT:
+		result = TC_ACT_SHOT;
+		qdisc_qstats_drop(sch);
+		break;
+	case TC_ACT_STOLEN:
+	case TC_ACT_QUEUED:
+		result = TC_ACT_STOLEN;
+		break;
+	case TC_ACT_RECLASSIFY:
+	case TC_ACT_OK:
+		skb->tc_index = TC_H_MIN(res.classid);
+	default:
+		result = TC_ACT_OK;
+		break;
+	}
+
+	return result;
+}
+
+/* ------------------------------------------------------------- */
+
+static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
+{
+	net_inc_ingress_queue();
+
+	return 0;
+}
+
+static void ingress_destroy(struct Qdisc *sch)
+{
+	struct ingress_qdisc_data *p = qdisc_priv(sch);
+
+	tcf_destroy_chain(&p->filter_list);
+	net_dec_ingress_queue();
+}
+
+static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+	struct nlattr *nest;
+
+	nest = nla_nest_start(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 = {
+	.leaf		=	ingress_leaf,
+	.get		=	ingress_get,
+	.put		=	ingress_put,
+	.walk		=	ingress_walk,
+	.tcf_chain	=	ingress_find_tcf,
+	.bind_tcf	=	ingress_bind_filter,
+	.unbind_tcf	=	ingress_put,
+};
+
+static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
+	.cl_ops		=	&ingress_class_ops,
+	.id		=	"ingress",
+	.priv_size	=	sizeof(struct ingress_qdisc_data),
+	.enqueue	=	ingress_enqueue,
+	.init		=	ingress_init,
+	.destroy	=	ingress_destroy,
+	.dump		=	ingress_dump,
+	.owner		=	THIS_MODULE,
+};
+
+static int __init ingress_module_init(void)
+{
+	return register_qdisc(&ingress_qdisc_ops);
+}
+
+static void __exit ingress_module_exit(void)
+{
+	unregister_qdisc(&ingress_qdisc_ops);
+}
+
+module_init(ingress_module_init)
+module_exit(ingress_module_exit)
+MODULE_LICENSE("GPL");
-- 
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