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