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"); 259