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