SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #include <net/netlink.h>
  16 #include <net/pkt_sched.h>
  17
  18
  19 struct ingress_qdisc_data {
  20         struct tcf_proto        *filter_list;
  21 };
  22
  23 /* ------------------------- Class/flow operations ------------------------- */
  24
  25 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
  26 {
  27         return NULL;
  28 }
  29
  30 static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
  31 {
  32         return TC_H_MIN(classid) + 1;
  33 }
  34
  35 static unsigned long ingress_bind_filter(struct Qdisc *sch,
  36                                          unsigned long parent, u32 classid)
  37 {
  38         return ingress_get(sch, classid);
  39 }
  40
  41 static void ingress_put(struct Qdisc *sch, unsigned long cl)
  42 {
  43 }
  44
  45 static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
  46                           struct nlattr **tca, unsigned long *arg)
  47 {
  48         return 0;
  49 }
  50
  51 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
  52 {
  53         return;
  54 }
  55
  56 static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
  57 {
  58         struct ingress_qdisc_data *p = qdisc_priv(sch);
  59
  60         return &p->filter_list;
  61 }
  62
  63 /* --------------------------- Qdisc operations ---------------------------- */
  64
  65 static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
  66 {
  67         struct ingress_qdisc_data *p = qdisc_priv(sch);
  68         struct tcf_result res;
  69         int result;
  70
  71         result = tc_classify(skb, p->filter_list, &res);
  72
  73         sch->bstats.packets++;
  74         sch->bstats.bytes += qdisc_pkt_len(skb);
  75         switch (result) {
  76         case TC_ACT_SHOT:
  77                 result = TC_ACT_SHOT;
  78                 sch->qstats.drops++;
  79                 break;
  80         case TC_ACT_STOLEN:
  81         case TC_ACT_QUEUED:
  82                 result = TC_ACT_STOLEN;
  83                 break;
  84         case TC_ACT_RECLASSIFY:
  85         case TC_ACT_OK:
  86                 skb->tc_index = TC_H_MIN(res.classid);
  87         default:
  88                 result = TC_ACT_OK;
  89                 break;
  90         }
  91
  92         return result;
  93 }
  94
  95 /* ------------------------------------------------------------- */
  96
  97 static void ingress_destroy(struct Qdisc *sch)
  98 {
  99         struct ingress_qdisc_data *p = qdisc_priv(sch);
 100
 101         tcf_destroy_chain(&p->filter_list);
 102 }
 103
 104 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
 105 {
 106         struct nlattr *nest;
 107
 108         nest = nla_nest_start(skb, TCA_OPTIONS);
 109         if (nest == NULL)
 110                 goto nla_put_failure;
 111         nla_nest_end(skb, nest);
 112         return skb->len;
 113
 114 nla_put_failure:
 115         nla_nest_cancel(skb, nest);
 116         return -1;
 117 }
 118
 119 static const struct Qdisc_class_ops ingress_class_ops = {
 120         .leaf           =       ingress_leaf,
 121         .get            =       ingress_get,
 122         .put            =       ingress_put,
 123         .change         =       ingress_change,
 124         .walk           =       ingress_walk,
 125         .tcf_chain      =       ingress_find_tcf,
 126         .bind_tcf       =       ingress_bind_filter,
 127         .unbind_tcf     =       ingress_put,
 128 };
 129
 130 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
 131         .cl_ops         =       &ingress_class_ops,
 132         .id             =       "ingress",
 133         .priv_size      =       sizeof(struct ingress_qdisc_data),
 134         .enqueue        =       ingress_enqueue,
 135         .destroy        =       ingress_destroy,
 136         .dump           =       ingress_dump,
 137         .owner          =       THIS_MODULE,
 138 };
 139
 140 static int __init ingress_module_init(void)
 141 {
 142         return register_qdisc(&ingress_qdisc_ops);
 143 }
 144
 145 static void __exit ingress_module_exit(void)
 146 {
 147         unregister_qdisc(&ingress_qdisc_ops);
 148 }
 149
 150 module_init(ingress_module_init)
 151 module_exit(ingress_module_exit)
 152 MODULE_LICENSE("GPL");