/* 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	*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 **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;
  	int result;

  	result = tc_classify(skb, p->filter_list, &res);

  	qdisc_bstats_update(sch, skb);

  	switch (result) {

  	case TC_ACT_SHOT:
  		result = TC_ACT_SHOT;
  		sch->qstats.drops++;
  		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 void ingress_destroy(struct Qdisc *sch)
  {

  	struct ingress_qdisc_data *p = qdisc_priv(sch);

  	tcf_destroy_chain(&p->filter_list);

  }

  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;
  	nla_nest_end(skb, nest);

  	return skb->len;

  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,

  	.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");