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         if (sch->parent != TC_H_INGRESS)
  83                 return -EOPNOTSUPP;
  84
  85         net_inc_ingress_queue();
  86
  87         mini_qdisc_pair_init(&q->miniqp, sch, &dev->miniq_ingress);
  88
  89         q->block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
  90         q->block_info.chain_head_change = clsact_chain_head_change;
  91         q->block_info.chain_head_change_priv = &q->miniqp;
  92
  93         return tcf_block_get_ext(&q->block, sch, &q->block_info, extack);
  94 }
  95
  96 static void ingress_destroy(struct Qdisc *sch)
  97 {
  98         struct ingress_sched_data *q = qdisc_priv(sch);
  99
 100         if (sch->parent != TC_H_INGRESS)
 101                 return;
 102
 103         tcf_block_put_ext(q->block, sch, &q->block_info);
 104         net_dec_ingress_queue();
 105 }
 106
 107 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
 108 {
 109         struct nlattr *nest;
 110
 111         nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
 112         if (nest == NULL)
 113                 goto nla_put_failure;
 114
 115         return nla_nest_end(skb, nest);
 116
 117 nla_put_failure:
 118         nla_nest_cancel(skb, nest);
 119         return -1;
 120 }
 121
 122 static const struct Qdisc_class_ops ingress_class_ops = {
 123         .flags          =       QDISC_CLASS_OPS_DOIT_UNLOCKED,
 124         .leaf           =       ingress_leaf,
 125         .find           =       ingress_find,
 126         .walk           =       ingress_walk,
 127         .tcf_block      =       ingress_tcf_block,
 128         .bind_tcf       =       ingress_bind_filter,
 129         .unbind_tcf     =       ingress_unbind_filter,
 130 };
 131
 132 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
 133         .cl_ops                 =       &ingress_class_ops,
 134         .id                     =       "ingress",
 135         .priv_size              =       sizeof(struct ingress_sched_data),
 136         .static_flags           =       TCQ_F_INGRESS | TCQ_F_CPUSTATS,
 137         .init                   =       ingress_init,
 138         .destroy                =       ingress_destroy,
 139         .dump                   =       ingress_dump,
 140         .ingress_block_set      =       ingress_ingress_block_set,
 141         .ingress_block_get      =       ingress_ingress_block_get,
 142         .owner                  =       THIS_MODULE,
 143 };
 144
 145 struct clsact_sched_data {
 146         struct tcf_block *ingress_block;
 147         struct tcf_block *egress_block;
 148         struct tcf_block_ext_info ingress_block_info;
 149         struct tcf_block_ext_info egress_block_info;
 150         struct mini_Qdisc_pair miniqp_ingress;
 151         struct mini_Qdisc_pair miniqp_egress;
 152 };
 153
 154 static unsigned long clsact_find(struct Qdisc *sch, u32 classid)
 155 {
 156         switch (TC_H_MIN(classid)) {
 157         case TC_H_MIN(TC_H_MIN_INGRESS):
 158         case TC_H_MIN(TC_H_MIN_EGRESS):
 159                 return TC_H_MIN(classid);
 160         default:
 161                 return 0;
 162         }
 163 }
 164
 165 static unsigned long clsact_bind_filter(struct Qdisc *sch,
 166                                         unsigned long parent, u32 classid)
 167 {
 168         return clsact_find(sch, classid);
 169 }
 170
 171 static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl,
 172                                           struct netlink_ext_ack *extack)
 173 {
 174         struct clsact_sched_data *q = qdisc_priv(sch);
 175
 176         switch (cl) {
 177         case TC_H_MIN(TC_H_MIN_INGRESS):
 178                 return q->ingress_block;
 179         case TC_H_MIN(TC_H_MIN_EGRESS):
 180                 return q->egress_block;
 181         default:
 182                 return NULL;
 183         }
 184 }
 185
 186 static void clsact_ingress_block_set(struct Qdisc *sch, u32 block_index)
 187 {
 188         struct clsact_sched_data *q = qdisc_priv(sch);
 189
 190         q->ingress_block_info.block_index = block_index;
 191 }
 192
 193 static void clsact_egress_block_set(struct Qdisc *sch, u32 block_index)
 194 {
 195         struct clsact_sched_data *q = qdisc_priv(sch);
 196
 197         q->egress_block_info.block_index = block_index;
 198 }
 199
 200 static u32 clsact_ingress_block_get(struct Qdisc *sch)
 201 {
 202         struct clsact_sched_data *q = qdisc_priv(sch);
 203
 204         return q->ingress_block_info.block_index;
 205 }
 206
 207 static u32 clsact_egress_block_get(struct Qdisc *sch)
 208 {
 209         struct clsact_sched_data *q = qdisc_priv(sch);
 210
 211         return q->egress_block_info.block_index;
 212 }
 213
 214 static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
 215                        struct netlink_ext_ack *extack)
 216 {
 217         struct clsact_sched_data *q = qdisc_priv(sch);
 218         struct net_device *dev = qdisc_dev(sch);
 219         int err;
 220
 221         if (sch->parent != TC_H_CLSACT)
 222                 return -EOPNOTSUPP;
 223
 224         net_inc_ingress_queue();
 225         net_inc_egress_queue();
 226
 227         mini_qdisc_pair_init(&q->miniqp_ingress, sch, &dev->miniq_ingress);
 228
 229         q->ingress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
 230         q->ingress_block_info.chain_head_change = clsact_chain_head_change;
 231         q->ingress_block_info.chain_head_change_priv = &q->miniqp_ingress;
 232
 233         err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info,
 234                                 extack);
 235         if (err)
 236                 return err;
 237
 238         mini_qdisc_pair_init(&q->miniqp_egress, sch, &dev->miniq_egress);
 239
 240         q->egress_block_info.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS;
 241         q->egress_block_info.chain_head_change = clsact_chain_head_change;
 242         q->egress_block_info.chain_head_change_priv = &q->miniqp_egress;
 243
 244         return tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info, extack);
 245 }
 246
 247 static void clsact_destroy(struct Qdisc *sch)
 248 {
 249         struct clsact_sched_data *q = qdisc_priv(sch);
 250
 251         if (sch->parent != TC_H_CLSACT)
 252                 return;
 253
 254         tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);
 255         tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
 256
 257         net_dec_ingress_queue();
 258         net_dec_egress_queue();
 259 }
 260
 261 static const struct Qdisc_class_ops clsact_class_ops = {
 262         .flags          =       QDISC_CLASS_OPS_DOIT_UNLOCKED,
 263         .leaf           =       ingress_leaf,
 264         .find           =       clsact_find,
 265         .walk           =       ingress_walk,
 266         .tcf_block      =       clsact_tcf_block,
 267         .bind_tcf       =       clsact_bind_filter,
 268         .unbind_tcf     =       ingress_unbind_filter,
 269 };
 270
 271 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
 272         .cl_ops                 =       &clsact_class_ops,
 273         .id                     =       "clsact",
 274         .priv_size              =       sizeof(struct clsact_sched_data),
 275         .static_flags           =       TCQ_F_INGRESS | TCQ_F_CPUSTATS,
 276         .init                   =       clsact_init,
 277         .destroy                =       clsact_destroy,
 278         .dump                   =       ingress_dump,
 279         .ingress_block_set      =       clsact_ingress_block_set,
 280         .egress_block_set       =       clsact_egress_block_set,
 281         .ingress_block_get      =       clsact_ingress_block_get,
 282         .egress_block_get       =       clsact_egress_block_get,
 283         .owner                  =       THIS_MODULE,
 284 };
 285
 286 static int __init ingress_module_init(void)
 287 {
 288         int ret;
 289
 290         ret = register_qdisc(&ingress_qdisc_ops);
 291         if (!ret) {
 292                 ret = register_qdisc(&clsact_qdisc_ops);
 293                 if (ret)
 294                         unregister_qdisc(&ingress_qdisc_ops);
 295         }
 296
 297         return ret;
 298 }
 299
 300 static void __exit ingress_module_exit(void)
 301 {
 302         unregister_qdisc(&ingress_qdisc_ops);
 303         unregister_qdisc(&clsact_qdisc_ops);
 304 }
 305
 306 module_init(ingress_module_init);
 307 module_exit(ingress_module_exit);
 308
 309 MODULE_ALIAS("sch_clsact");
 310 MODULE_LICENSE("GPL");