linux/net/sched/sch_ingress.c
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   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#include <net/netlink.h>
  16#include <net/pkt_sched.h>
  17
  18
  19struct ingress_qdisc_data {
  20        struct tcf_proto        *filter_list;
  21};
  22
  23/* ------------------------- Class/flow operations ------------------------- */
  24
  25static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
  26{
  27        return NULL;
  28}
  29
  30static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
  31{
  32        return TC_H_MIN(classid) + 1;
  33}
  34
  35static unsigned long ingress_bind_filter(struct Qdisc *sch,
  36                                         unsigned long parent, u32 classid)
  37{
  38        return ingress_get(sch, classid);
  39}
  40
  41static void ingress_put(struct Qdisc *sch, unsigned long cl)
  42{
  43}
  44
  45static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
  46{
  47}
  48
  49static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
  50{
  51        struct ingress_qdisc_data *p = qdisc_priv(sch);
  52
  53        return &p->filter_list;
  54}
  55
  56/* --------------------------- Qdisc operations ---------------------------- */
  57
  58static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
  59{
  60        struct ingress_qdisc_data *p = qdisc_priv(sch);
  61        struct tcf_result res;
  62        int result;
  63
  64        result = tc_classify(skb, p->filter_list, &res);
  65
  66        qdisc_bstats_update(sch, skb);
  67        switch (result) {
  68        case TC_ACT_SHOT:
  69                result = TC_ACT_SHOT;
  70                sch->qstats.drops++;
  71                break;
  72        case TC_ACT_STOLEN:
  73        case TC_ACT_QUEUED:
  74                result = TC_ACT_STOLEN;
  75                break;
  76        case TC_ACT_RECLASSIFY:
  77        case TC_ACT_OK:
  78                skb->tc_index = TC_H_MIN(res.classid);
  79        default:
  80                result = TC_ACT_OK;
  81                break;
  82        }
  83
  84        return result;
  85}
  86
  87/* ------------------------------------------------------------- */
  88
  89static void ingress_destroy(struct Qdisc *sch)
  90{
  91        struct ingress_qdisc_data *p = qdisc_priv(sch);
  92
  93        tcf_destroy_chain(&p->filter_list);
  94}
  95
  96static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
  97{
  98        struct nlattr *nest;
  99
 100        nest = nla_nest_start(skb, TCA_OPTIONS);
 101        if (nest == NULL)
 102                goto nla_put_failure;
 103        nla_nest_end(skb, nest);
 104        return skb->len;
 105
 106nla_put_failure:
 107        nla_nest_cancel(skb, nest);
 108        return -1;
 109}
 110
 111static const struct Qdisc_class_ops ingress_class_ops = {
 112        .leaf           =       ingress_leaf,
 113        .get            =       ingress_get,
 114        .put            =       ingress_put,
 115        .walk           =       ingress_walk,
 116        .tcf_chain      =       ingress_find_tcf,
 117        .bind_tcf       =       ingress_bind_filter,
 118        .unbind_tcf     =       ingress_put,
 119};
 120
 121static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
 122        .cl_ops         =       &ingress_class_ops,
 123        .id             =       "ingress",
 124        .priv_size      =       sizeof(struct ingress_qdisc_data),
 125        .enqueue        =       ingress_enqueue,
 126        .destroy        =       ingress_destroy,
 127        .dump           =       ingress_dump,
 128        .owner          =       THIS_MODULE,
 129};
 130
 131static int __init ingress_module_init(void)
 132{
 133        return register_qdisc(&ingress_qdisc_ops);
 134}
 135
 136static void __exit ingress_module_exit(void)
 137{
 138        unregister_qdisc(&ingress_qdisc_ops);
 139}
 140
 141module_init(ingress_module_init)
 142module_exit(ingress_module_exit)
 143MODULE_LICENSE("GPL");
 144
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