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 struct netlink_ext_ack *extack) 53 { 54 struct ingress_sched_data *q = qdisc_priv(sch); 55 56 return q->block; 57 } 58 59 static void clsact_chain_head_change(struct tcf_proto *tp_head, void *priv) 60 { 61 struct mini_Qdisc_pair *miniqp = priv; 62 63 mini_qdisc_pair_swap(miniqp, tp_head); 64 }; 65 66 static void ingress_ingress_block_set(struct Qdisc *sch, u32 block_index) 67 { 68 struct ingress_sched_data *q = qdisc_priv(sch); 69 70 q->block_info.block_index = block_index; 71 } 72 73 static u32 ingress_ingress_block_get(struct Qdisc *sch) 74 { 75 struct ingress_sched_data *q = qdisc_priv(sch); 76 77 return q->block_info.block_index; 78 } 79 80 static int ingress_init(struct Qdisc *sch, struct nlattr *opt, 81 struct netlink_ext_ack *extack) 82 { 83 struct ingress_sched_data *q = qdisc_priv(sch); 84 struct net_device *dev = qdisc_dev(sch); 85 86 net_inc_ingress_queue(); 87 88 mini_qdisc_pair_init(&q->miniqp, sch, &dev->miniq_ingress); 89 90 q->block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS; 91 q->block_info.chain_head_change = clsact_chain_head_change; 92 q->block_info.chain_head_change_priv = &q->miniqp; 93 94 return tcf_block_get_ext(&q->block, sch, &q->block_info, extack); 95 } 96 97 static void ingress_destroy(struct Qdisc *sch) 98 { 99 struct ingress_sched_data *q = qdisc_priv(sch); 100 101 tcf_block_put_ext(q->block, sch, &q->block_info); 102 net_dec_ingress_queue(); 103 } 104 105 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 106 { 107 struct nlattr *nest; 108 109 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 110 if (nest == NULL) 111 goto nla_put_failure; 112 113 return nla_nest_end(skb, nest); 114 115 nla_put_failure: 116 nla_nest_cancel(skb, nest); 117 return -1; 118 } 119 120 static const struct Qdisc_class_ops ingress_class_ops = { 121 .leaf = ingress_leaf, 122 .find = ingress_find, 123 .walk = ingress_walk, 124 .tcf_block = ingress_tcf_block, 125 .bind_tcf = ingress_bind_filter, 126 .unbind_tcf = ingress_unbind_filter, 127 }; 128 129 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { 130 .cl_ops = &ingress_class_ops, 131 .id = "ingress", 132 .priv_size = sizeof(struct ingress_sched_data), 133 .static_flags = TCQ_F_CPUSTATS, 134 .init = ingress_init, 135 .destroy = ingress_destroy, 136 .dump = ingress_dump, 137 .ingress_block_set = ingress_ingress_block_set, 138 .ingress_block_get = ingress_ingress_block_get, 139 .owner = THIS_MODULE, 140 }; 141 142 struct clsact_sched_data { 143 struct tcf_block *ingress_block; 144 struct tcf_block *egress_block; 145 struct tcf_block_ext_info ingress_block_info; 146 struct tcf_block_ext_info egress_block_info; 147 struct mini_Qdisc_pair miniqp_ingress; 148 struct mini_Qdisc_pair miniqp_egress; 149 }; 150 151 static unsigned long clsact_find(struct Qdisc *sch, u32 classid) 152 { 153 switch (TC_H_MIN(classid)) { 154 case TC_H_MIN(TC_H_MIN_INGRESS): 155 case TC_H_MIN(TC_H_MIN_EGRESS): 156 return TC_H_MIN(classid); 157 default: 158 return 0; 159 } 160 } 161 162 static unsigned long clsact_bind_filter(struct Qdisc *sch, 163 unsigned long parent, u32 classid) 164 { 165 return clsact_find(sch, classid); 166 } 167 168 static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl, 169 struct netlink_ext_ack *extack) 170 { 171 struct clsact_sched_data *q = qdisc_priv(sch); 172 173 switch (cl) { 174 case TC_H_MIN(TC_H_MIN_INGRESS): 175 return q->ingress_block; 176 case TC_H_MIN(TC_H_MIN_EGRESS): 177 return q->egress_block; 178 default: 179 return NULL; 180 } 181 } 182 183 static void clsact_ingress_block_set(struct Qdisc *sch, u32 block_index) 184 { 185 struct clsact_sched_data *q = qdisc_priv(sch); 186 187 q->ingress_block_info.block_index = block_index; 188 } 189 190 static void clsact_egress_block_set(struct Qdisc *sch, u32 block_index) 191 { 192 struct clsact_sched_data *q = qdisc_priv(sch); 193 194 q->egress_block_info.block_index = block_index; 195 } 196 197 static u32 clsact_ingress_block_get(struct Qdisc *sch) 198 { 199 struct clsact_sched_data *q = qdisc_priv(sch); 200 201 return q->ingress_block_info.block_index; 202 } 203 204 static u32 clsact_egress_block_get(struct Qdisc *sch) 205 { 206 struct clsact_sched_data *q = qdisc_priv(sch); 207 208 return q->egress_block_info.block_index; 209 } 210 211 static int clsact_init(struct Qdisc *sch, struct nlattr *opt, 212 struct netlink_ext_ack *extack) 213 { 214 struct clsact_sched_data *q = qdisc_priv(sch); 215 struct net_device *dev = qdisc_dev(sch); 216 int err; 217 218 net_inc_ingress_queue(); 219 net_inc_egress_queue(); 220 221 mini_qdisc_pair_init(&q->miniqp_ingress, sch, &dev->miniq_ingress); 222 223 q->ingress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS; 224 q->ingress_block_info.chain_head_change = clsact_chain_head_change; 225 q->ingress_block_info.chain_head_change_priv = &q->miniqp_ingress; 226 227 err = tcf_block_get_ext(&q->ingress_block, sch, &q->ingress_block_info, 228 extack); 229 if (err) 230 return err; 231 232 mini_qdisc_pair_init(&q->miniqp_egress, sch, &dev->miniq_egress); 233 234 q->egress_block_info.binder_type = TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS; 235 q->egress_block_info.chain_head_change = clsact_chain_head_change; 236 q->egress_block_info.chain_head_change_priv = &q->miniqp_egress; 237 238 return tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info, extack); 239 } 240 241 static void clsact_destroy(struct Qdisc *sch) 242 { 243 struct clsact_sched_data *q = qdisc_priv(sch); 244 245 tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info); 246 tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info); 247 248 net_dec_ingress_queue(); 249 net_dec_egress_queue(); 250 } 251 252 static const struct Qdisc_class_ops clsact_class_ops = { 253 .leaf = ingress_leaf, 254 .find = clsact_find, 255 .walk = ingress_walk, 256 .tcf_block = clsact_tcf_block, 257 .bind_tcf = clsact_bind_filter, 258 .unbind_tcf = ingress_unbind_filter, 259 }; 260 261 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = { 262 .cl_ops = &clsact_class_ops, 263 .id = "clsact", 264 .priv_size = sizeof(struct clsact_sched_data), 265 .static_flags = TCQ_F_CPUSTATS, 266 .init = clsact_init, 267 .destroy = clsact_destroy, 268 .dump = ingress_dump, 269 .ingress_block_set = clsact_ingress_block_set, 270 .egress_block_set = clsact_egress_block_set, 271 .ingress_block_get = clsact_ingress_block_get, 272 .egress_block_get = clsact_egress_block_get, 273 .owner = THIS_MODULE, 274 }; 275 276 static int __init ingress_module_init(void) 277 { 278 int ret; 279 280 ret = register_qdisc(&ingress_qdisc_ops); 281 if (!ret) { 282 ret = register_qdisc(&clsact_qdisc_ops); 283 if (ret) 284 unregister_qdisc(&ingress_qdisc_ops); 285 } 286 287 return ret; 288 } 289 290 static void __exit ingress_module_exit(void) 291 { 292 unregister_qdisc(&ingress_qdisc_ops); 293 unregister_qdisc(&clsact_qdisc_ops); 294 } 295 296 module_init(ingress_module_init); 297 module_exit(ingress_module_exit); 298 299 MODULE_ALIAS("sch_clsact"); 300 MODULE_LICENSE("GPL"); 301