net/sched/sch_ingress.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* net/sched/sch_ingress.c - Ingress and clsact qdisc
   3  *
   4  * Authors:     Jamal Hadi Salim 1999
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/list.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/rtnetlink.h>
  12
  13 #include <net/netlink.h>
  14 #include <net/pkt_sched.h>
  15 #include <net/pkt_cls.h>
  16
  17 struct ingress_sched_data {
  18         struct tcf_block *block;
  19         struct tcf_block_ext_info block_info;
  20         struct mini_Qdisc_pair miniqp;
  21 };
  22
  23 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
  24 {
  25         return NULL;
  26 }
  27
  28 static unsigned long ingress_find(struct Qdisc *sch, u32 classid)
  29 {
  30         return TC_H_MIN(classid) + 1;
  31 }
  32
  33 static unsigned long ingress_bind_filter(struct Qdisc *sch,
  34                                          unsigned long parent, u32 classid)
  35 {
  36         return ingress_find(sch, classid);
  37 }
  38
  39 static void ingress_unbind_filter(struct Qdisc *sch, unsigned long cl)
  40 {
  41 }
  42
  43 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
  44 {
  45 }
  46
  47 static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl,
  48                                            struct netlink_ext_ack *extack)
  49 {
  50         struct ingress_sched_data *q = qdisc_priv(sch);
  51
  52         return q->block;
  53 }
  54
  55 static void clsact_chain_head_change(struct tcf_proto *tp_head, void *priv)
  56 {
  57         struct mini_Qdisc_pair *miniqp = priv;
  58
  59         mini_qdisc_pair_swap(miniqp, tp_head);
  60 };
  61
  62 static void ingress_ingress_block_set(struct Qdisc *sch, u32 block_index)
  63 {
  64         struct ingress_sched_data *q = qdisc_priv(sch);
  65
  66         q->block_info.block_index = block_index;
  67 }
  68
  69 static u32 ingress_ingress_block_get(struct Qdisc *sch)
  70 {
  71         struct ingress_sched_data *q = qdisc_priv(sch);
  72
  73         return q->block_info.block_index;
  74 }
  75
  76 static int ingress_init(struct Qdisc *sch, struct nlattr *opt,
  77                         struct netlink_ext_ack *extack)
  78 {
  79         struct ingress_sched_data *q = qdisc_priv(sch);
  80         struct net_device *dev = qdisc_dev(sch);
  81
  82         net_inc_ingress_queue();
  83
  84         mini_qdisc_pair_init(&q->miniqp, sch, &dev->miniq_ingress);
  85
  86         q->block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
  87         q->block_info.chain_head_change = clsact_chain_head_change;
  88         q->block_info.chain_head_change_priv = &q->miniqp;
  89
  90         return tcf_block_get_ext(&q->block, sch, &q->block_info, extack);
  91 }
  92
  93 static void ingress_destroy(struct Qdisc *sch)
  94 {
  95         struct ingress_sched_data *q = qdisc_priv(sch);
  96
  97         tcf_block_put_ext(q->block, sch, &q->block_info);
  98         net_dec_ingress_queue();
  99 }
 100
 101 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
 102 {
 103         struct nlattr *nest;
 104
 105         nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
 106         if (nest == NULL)
 107                 goto nla_put_failure;
 108
 109         return nla_nest_end(skb, nest);
 110
 111 nla_put_failure:
 112         nla_nest_cancel(skb, nest);
 113         return -1;
 114 }
 115
 116 static const struct Qdisc_class_ops ingress_class_ops = {
 117         .leaf           =       ingress_leaf,
 118         .find           =       ingress_find,
 119         .walk           =       ingress_walk,
 120         .tcf_block      =       ingress_tcf_block,
 121         .bind_tcf       =       ingress_bind_filter,
 122         .unbind_tcf     =       ingress_unbind_filter,
 123 };
 124
 125 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
 126         .cl_ops                 =       &ingress_class_ops,
 127         .id                     =       "ingress",
 128         .priv_size              =       sizeof(struct ingress_sched_data),
 129         .static_flags           =       TCQ_F_CPUSTATS,
 130         .init                   =       ingress_init,
 131         .destroy                =       ingress_destroy,
 132         .dump                   =       ingress_dump,
 133         .ingress_block_set      =       ingress_ingress_block_set,
 134         .ingress_block_get      =       ingress_ingress_block_get,
 135         .owner                  =       THIS_MODULE,
 136 };
 137
 138 struct clsact_sched_data {
 139         struct tcf_block *ingress_block;
 140         struct tcf_block *egress_block;
 141         struct tcf_block_ext_info ingress_block_info;
 142         struct tcf_block_ext_info egress_block_info;
 143         struct mini_Qdisc_pair miniqp_ingress;
 144         struct mini_Qdisc_pair miniqp_egress;
 145 };
 146
 147 static unsigned long clsact_find(struct Qdisc *sch, u32 classid)
 148 {
 149         switch (TC_H_MIN(classid)) {
 150         case TC_H_MIN(TC_H_MIN_INGRESS):
 151         case TC_H_MIN(TC_H_MIN_EGRESS):
 152                 return TC_H_MIN(classid);
 153         default:
 154                 return 0;
 155         }
 156 }
 157
 158 static unsigned long clsact_bind_filter(struct Qdisc *sch,
 159                                         unsigned long parent, u32 classid)
 160 {
 161         return clsact_find(sch, classid);
 162 }
 163
 164 static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl,
 165                                           struct netlink_ext_ack *extack)
 166 {
 167         struct clsact_sched_data *q = qdisc_priv(sch);
 168
 169         switch (cl) {
 170         case TC_H_MIN(TC_H_MIN_INGRESS):
 171                 return q->ingress_block;
 172         case TC_H_MIN(TC_H_MIN_EGRESS):
 173                 return q->egress_block;
 174         default:
 175                 return NULL;
 176         }
 177 }
 178
 179 static void clsact_ingress_block_set(struct Qdisc *sch, u32 block_index)
 180 {
 181         struct clsact_sched_data *q = qdisc_priv(sch);
 182
 183         q->ingress_block_info.block_index = block_index;
 184 }
 185
 186 static void clsact_egress_block_set(struct Qdisc *sch, u32 block_index)
 187 {
 188         struct clsact_sched_data *q = qdisc_priv(sch);
 189
 190         q->egress_block_info.block_index = block_index;
 191 }
 192
 193 static u32 clsact_ingress_block_get(struct Qdisc *sch)
 194 {
 195         struct clsact_sched_data *q = qdisc_priv(sch);
 196
 197         return q->ingress_block_info.block_index;
 198 }
 199
 200 static u32 clsact_egress_block_get(struct Qdisc *sch)
 201 {
 202         struct clsact_sched_data *q = qdisc_priv(sch);
 203
 204         return q->egress_block_info.block_index;
 205 }
 206
 207 static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
 208                        struct netlink_ext_ack *extack)
 209 {
 210         struct clsact_sched_data *q = qdisc_priv(sch);
 211         struct net_device *dev = qdisc_dev(sch);
 212         int err;
 213
 214         net_inc_ingress_queue();
 215         net_inc_egress_queue();
 216
 217         mini_qdisc_pair_init(&q->miniqp_ingress, sch, &dev->miniq_ingress);
 218
 219         q->ingress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
 220         q->ingress_block_info.chain_head_change = clsact_chain_head_change;
 221         q->ingress_block_info.chain_head_change_priv = &q->miniqp_ingress;
 222
 223         err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info,
 224                                 extack);
 225         if (err)
 226                 return err;
 227
 228         mini_qdisc_pair_init(&q->miniqp_egress, sch, &dev->miniq_egress);
 229
 230         q->egress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS;
 231         q->egress_block_info.chain_head_change = clsact_chain_head_change;
 232         q->egress_block_info.chain_head_change_priv = &q->miniqp_egress;
 233
 234         return tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info, extack);
 235 }
 236
 237 static void clsact_destroy(struct Qdisc *sch)
 238 {
 239         struct clsact_sched_data *q = qdisc_priv(sch);
 240
 241         tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);
 242         tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
 243
 244         net_dec_ingress_queue();
 245         net_dec_egress_queue();
 246 }
 247
 248 static const struct Qdisc_class_ops clsact_class_ops = {
 249         .leaf           =       ingress_leaf,
 250         .find           =       clsact_find,
 251         .walk           =       ingress_walk,
 252         .tcf_block      =       clsact_tcf_block,
 253         .bind_tcf       =       clsact_bind_filter,
 254         .unbind_tcf     =       ingress_unbind_filter,
 255 };
 256
 257 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
 258         .cl_ops                 =       &clsact_class_ops,
 259         .id                     =       "clsact",
 260         .priv_size              =       sizeof(struct clsact_sched_data),
 261         .static_flags           =       TCQ_F_CPUSTATS,
 262         .init                   =       clsact_init,
 263         .destroy                =       clsact_destroy,
 264         .dump                   =       ingress_dump,
 265         .ingress_block_set      =       clsact_ingress_block_set,
 266         .egress_block_set       =       clsact_egress_block_set,
 267         .ingress_block_get      =       clsact_ingress_block_get,
 268         .egress_block_get       =       clsact_egress_block_get,
 269         .owner                  =       THIS_MODULE,
 270 };
 271
 272 static int __init ingress_module_init(void)
 273 {
 274         int ret;
 275
 276         ret = register_qdisc(&ingress_qdisc_ops);
 277         if (!ret) {
 278                 ret = register_qdisc(&clsact_qdisc_ops);
 279                 if (ret)
 280                         unregister_qdisc(&ingress_qdisc_ops);
 281         }
 282
 283         return ret;
 284 }
 285
 286 static void __exit ingress_module_exit(void)
 287 {
 288         unregister_qdisc(&ingress_qdisc_ops);
 289         unregister_qdisc(&clsact_qdisc_ops);
 290 }
 291
 292 module_init(ingress_module_init);
 293 module_exit(ingress_module_exit);
 294
 295 MODULE_ALIAS("sch_clsact");
 296 MODULE_LICENSE("GPL");