net/sched/sch_ingress.c

   1 /* net/sched/sch_ingress.c - Ingress qdisc
   2  *              This program is free software; you can redistribute it and/or
   3  *              modify it under the terms of the GNU General Public License
   4  *              as published by the Free Software Foundation; either version
   5  *              2 of the License, or (at your option) any later version.
   6  *
   7  * Authors:     Jamal Hadi Salim 1999
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/list.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/rtnetlink.h>
  15
  16 #include <net/netlink.h>
  17 #include <net/pkt_sched.h>
  18
  19 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
  20 {
  21         return NULL;
  22 }
  23
  24 static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
  25 {
  26         return TC_H_MIN(classid) + 1;
  27 }
  28
  29 static unsigned long ingress_bind_filter(struct Qdisc *sch,
  30                                          unsigned long parent, u32 classid)
  31 {
  32         return ingress_get(sch, classid);
  33 }
  34
  35 static void ingress_put(struct Qdisc *sch, unsigned long cl)
  36 {
  37 }
  38
  39 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
  40 {
  41 }
  42
  43 static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch,
  44                                                  unsigned long cl)
  45 {
  46         struct net_device *dev = qdisc_dev(sch);
  47
  48         return &dev->ingress_cl_list;
  49 }
  50
  51 static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
  52 {
  53         net_inc_ingress_queue();
  54         sch->flags |= TCQ_F_CPUSTATS;
  55
  56         return 0;
  57 }
  58
  59 static void ingress_destroy(struct Qdisc *sch)
  60 {
  61         struct net_device *dev = qdisc_dev(sch);
  62
  63         tcf_destroy_chain(&dev->ingress_cl_list);
  64         net_dec_ingress_queue();
  65 }
  66
  67 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
  68 {
  69         struct nlattr *nest;
  70
  71         nest = nla_nest_start(skb, TCA_OPTIONS);
  72         if (nest == NULL)
  73                 goto nla_put_failure;
  74
  75         return nla_nest_end(skb, nest);
  76
  77 nla_put_failure:
  78         nla_nest_cancel(skb, nest);
  79         return -1;
  80 }
  81
  82 static const struct Qdisc_class_ops ingress_class_ops = {
  83         .leaf           =       ingress_leaf,
  84         .get            =       ingress_get,
  85         .put            =       ingress_put,
  86         .walk           =       ingress_walk,
  87         .tcf_chain      =       ingress_find_tcf,
  88         .bind_tcf       =       ingress_bind_filter,
  89         .unbind_tcf     =       ingress_put,
  90 };
  91
  92 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
  93         .cl_ops         =       &ingress_class_ops,
  94         .id             =       "ingress",
  95         .init           =       ingress_init,
  96         .destroy        =       ingress_destroy,
  97         .dump           =       ingress_dump,
  98         .owner          =       THIS_MODULE,
  99 };
 100
 101 static int __init ingress_module_init(void)
 102 {
 103         return register_qdisc(&ingress_qdisc_ops);
 104 }
 105
 106 static void __exit ingress_module_exit(void)
 107 {
 108         unregister_qdisc(&ingress_qdisc_ops);
 109 }
 110
 111 module_init(ingress_module_init);
 112 module_exit(ingress_module_exit);
 113
 114 MODULE_LICENSE("GPL");