net/sched/sch_ingress.c

   1 /* net/sched/sch_ingress.c - Ingress and clsact qdisc
   2  *
   3  *              This program is free software; you can redistribute it and/or
   4  *              modify it under the terms of the GNU General Public License
   5  *              as published by the Free Software Foundation; either version
   6  *              2 of the License, or (at your option) any later version.
   7  *
   8  * Authors:     Jamal Hadi Salim 1999
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/list.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/rtnetlink.h>
  16
  17 #include <net/netlink.h>
  18 #include <net/pkt_sched.h>
  19 #include <net/pkt_cls.h>
  20
  21 struct ingress_sched_data {
  22         struct tcf_block *block;
  23         struct tcf_block_ext_info block_info;
  24         struct mini_Qdisc_pair miniqp;
  25 };
  26
  27 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
  28 {
  29         return NULL;
  30 }
  31
  32 static unsigned long ingress_find(struct Qdisc *sch, u32 classid)
  33 {
  34         return TC_H_MIN(classid) + 1;
  35 }
  36
  37 static unsigned long ingress_bind_filter(struct Qdisc *sch,
  38                                          unsigned long parent, u32 classid)
  39 {
  40         return ingress_find(sch, classid);
  41 }
  42
  43 static void ingress_unbind_filter(struct Qdisc *sch, unsigned long cl)
  44 {
  45 }
  46
  47 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
  48 {
  49 }
  50
  51 static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl)
  52 {
  53         struct ingress_sched_data *q = qdisc_priv(sch);
  54
  55         return q->block;
  56 }
  57
  58 static void clsact_chain_head_change(struct tcf_proto *tp_head, void *priv)
  59 {
  60         struct mini_Qdisc_pair *miniqp = priv;
  61
  62         mini_qdisc_pair_swap(miniqp, tp_head);
  63 }
  64
  65 static int ingress_init(struct Qdisc *sch, struct nlattr *opt)
  66 {
  67         struct ingress_sched_data *q = qdisc_priv(sch);
  68         struct net_device *dev = qdisc_dev(sch);
  69         int err;
  70
  71         net_inc_ingress_queue();
  72
  73         mini_qdisc_pair_init(&q->miniqp, sch, &dev->miniq_ingress);
  74
  75         q->block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
  76         q->block_info.chain_head_change = clsact_chain_head_change;
  77         q->block_info.chain_head_change_priv = &q->miniqp;
  78
  79         err = tcf_block_get_ext(&q->block, sch, &q->block_info);
  80         if (err)
  81                 return err;
  82
  83         sch->flags |= TCQ_F_CPUSTATS;
  84
  85         return 0;
  86 }
  87
  88 static void ingress_destroy(struct Qdisc *sch)
  89 {
  90         struct ingress_sched_data *q = qdisc_priv(sch);
  91
  92         tcf_block_put_ext(q->block, sch, &q->block_info);
  93         net_dec_ingress_queue();
  94 }
  95
  96 static 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
 104         return nla_nest_end(skb, nest);
 105
 106 nla_put_failure:
 107         nla_nest_cancel(skb, nest);
 108         return -1;
 109 }
 110
 111 static const struct Qdisc_class_ops ingress_class_ops = {
 112         .leaf           =       ingress_leaf,
 113         .find           =       ingress_find,
 114         .walk           =       ingress_walk,
 115         .tcf_block      =       ingress_tcf_block,
 116         .bind_tcf       =       ingress_bind_filter,
 117         .unbind_tcf     =       ingress_unbind_filter,
 118 };
 119
 120 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
 121         .cl_ops         =       &ingress_class_ops,
 122         .id             =       "ingress",
 123         .priv_size      =       sizeof(struct ingress_sched_data),
 124         .init           =       ingress_init,
 125         .destroy        =       ingress_destroy,
 126         .dump           =       ingress_dump,
 127         .owner          =       THIS_MODULE,
 128 };
 129
 130 struct clsact_sched_data {
 131         struct tcf_block *ingress_block;
 132         struct tcf_block *egress_block;
 133         struct tcf_block_ext_info ingress_block_info;
 134         struct tcf_block_ext_info egress_block_info;
 135         struct mini_Qdisc_pair miniqp_ingress;
 136         struct mini_Qdisc_pair miniqp_egress;
 137 };
 138
 139 static unsigned long clsact_find(struct Qdisc *sch, u32 classid)
 140 {
 141         switch (TC_H_MIN(classid)) {
 142         case TC_H_MIN(TC_H_MIN_INGRESS):
 143         case TC_H_MIN(TC_H_MIN_EGRESS):
 144                 return TC_H_MIN(classid);
 145         default:
 146                 return 0;
 147         }
 148 }
 149
 150 static unsigned long clsact_bind_filter(struct Qdisc *sch,
 151                                         unsigned long parent, u32 classid)
 152 {
 153         return clsact_find(sch, classid);
 154 }
 155
 156 static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl)
 157 {
 158         struct clsact_sched_data *q = qdisc_priv(sch);
 159
 160         switch (cl) {
 161         case TC_H_MIN(TC_H_MIN_INGRESS):
 162                 return q->ingress_block;
 163         case TC_H_MIN(TC_H_MIN_EGRESS):
 164                 return q->egress_block;
 165         default:
 166                 return NULL;
 167         }
 168 }
 169
 170 static int clsact_init(struct Qdisc *sch, struct nlattr *opt)
 171 {
 172         struct clsact_sched_data *q = qdisc_priv(sch);
 173         struct net_device *dev = qdisc_dev(sch);
 174         int err;
 175
 176         net_inc_ingress_queue();
 177         net_inc_egress_queue();
 178
 179         mini_qdisc_pair_init(&q->miniqp_ingress, sch, &dev->miniq_ingress);
 180
 181         q->ingress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
 182         q->ingress_block_info.chain_head_change = clsact_chain_head_change;
 183         q->ingress_block_info.chain_head_change_priv = &q->miniqp_ingress;
 184
 185         err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info);
 186         if (err)
 187                 return err;
 188
 189         mini_qdisc_pair_init(&q->miniqp_egress, sch, &dev->miniq_egress);
 190
 191         q->egress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS;
 192         q->egress_block_info.chain_head_change = clsact_chain_head_change;
 193         q->egress_block_info.chain_head_change_priv = &q->miniqp_egress;
 194
 195         err = tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info);
 196         if (err)
 197                 return err;
 198
 199         sch->flags |= TCQ_F_CPUSTATS;
 200
 201         return 0;
 202 }
 203
 204 static void clsact_destroy(struct Qdisc *sch)
 205 {
 206         struct clsact_sched_data *q = qdisc_priv(sch);
 207
 208         tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);
 209         tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
 210
 211         net_dec_ingress_queue();
 212         net_dec_egress_queue();
 213 }
 214
 215 static const struct Qdisc_class_ops clsact_class_ops = {
 216         .leaf           =       ingress_leaf,
 217         .find           =       clsact_find,
 218         .walk           =       ingress_walk,
 219         .tcf_block      =       clsact_tcf_block,
 220         .bind_tcf       =       clsact_bind_filter,
 221         .unbind_tcf     =       ingress_unbind_filter,
 222 };
 223
 224 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
 225         .cl_ops         =       &clsact_class_ops,
 226         .id             =       "clsact",
 227         .priv_size      =       sizeof(struct clsact_sched_data),
 228         .init           =       clsact_init,
 229         .destroy        =       clsact_destroy,
 230         .dump           =       ingress_dump,
 231         .owner          =       THIS_MODULE,
 232 };
 233
 234 static int __init ingress_module_init(void)
 235 {
 236         int ret;
 237
 238         ret = register_qdisc(&ingress_qdisc_ops);
 239         if (!ret) {
 240                 ret = register_qdisc(&clsact_qdisc_ops);
 241                 if (ret)
 242                         unregister_qdisc(&ingress_qdisc_ops);
 243         }
 244
 245         return ret;
 246 }
 247
 248 static void __exit ingress_module_exit(void)
 249 {
 250         unregister_qdisc(&ingress_qdisc_ops);
 251         unregister_qdisc(&clsact_qdisc_ops);
 252 }
 253
 254 module_init(ingress_module_init);
 255 module_exit(ingress_module_exit);
 256
 257 MODULE_ALIAS("sch_clsact");
 258 MODULE_LICENSE("GPL");