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 }; 24 25 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) 26 { 27 return NULL; 28 } 29 30 static unsigned long ingress_get(struct Qdisc *sch, u32 classid) 31 { 32 return TC_H_MIN(classid) + 1; 33 } 34 35 static bool ingress_cl_offload(u32 classid) 36 { 37 return true; 38 } 39 40 static unsigned long ingress_bind_filter(struct Qdisc *sch, 41 unsigned long parent, u32 classid) 42 { 43 return ingress_get(sch, classid); 44 } 45 46 static void ingress_put(struct Qdisc *sch, unsigned long cl) 47 { 48 } 49 50 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) 51 { 52 } 53 54 static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl) 55 { 56 struct ingress_sched_data *q = qdisc_priv(sch); 57 58 return q->block; 59 } 60 61 static int ingress_init(struct Qdisc *sch, struct nlattr *opt) 62 { 63 struct ingress_sched_data *q = qdisc_priv(sch); 64 struct net_device *dev = qdisc_dev(sch); 65 int err; 66 67 err = tcf_block_get(&q->block, &dev->ingress_cl_list); 68 if (err) 69 return err; 70 71 net_inc_ingress_queue(); 72 sch->flags |= TCQ_F_CPUSTATS; 73 74 return 0; 75 } 76 77 static void ingress_destroy(struct Qdisc *sch) 78 { 79 struct ingress_sched_data *q = qdisc_priv(sch); 80 81 tcf_block_put(q->block); 82 net_dec_ingress_queue(); 83 } 84 85 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 86 { 87 struct nlattr *nest; 88 89 nest = nla_nest_start(skb, TCA_OPTIONS); 90 if (nest == NULL) 91 goto nla_put_failure; 92 93 return nla_nest_end(skb, nest); 94 95 nla_put_failure: 96 nla_nest_cancel(skb, nest); 97 return -1; 98 } 99 100 static const struct Qdisc_class_ops ingress_class_ops = { 101 .leaf = ingress_leaf, 102 .get = ingress_get, 103 .put = ingress_put, 104 .walk = ingress_walk, 105 .tcf_block = ingress_tcf_block, 106 .tcf_cl_offload = ingress_cl_offload, 107 .bind_tcf = ingress_bind_filter, 108 .unbind_tcf = ingress_put, 109 }; 110 111 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { 112 .cl_ops = &ingress_class_ops, 113 .id = "ingress", 114 .priv_size = sizeof(struct ingress_sched_data), 115 .init = ingress_init, 116 .destroy = ingress_destroy, 117 .dump = ingress_dump, 118 .owner = THIS_MODULE, 119 }; 120 121 struct clsact_sched_data { 122 struct tcf_block *ingress_block; 123 struct tcf_block *egress_block; 124 }; 125 126 static unsigned long clsact_get(struct Qdisc *sch, u32 classid) 127 { 128 switch (TC_H_MIN(classid)) { 129 case TC_H_MIN(TC_H_MIN_INGRESS): 130 case TC_H_MIN(TC_H_MIN_EGRESS): 131 return TC_H_MIN(classid); 132 default: 133 return 0; 134 } 135 } 136 137 static bool clsact_cl_offload(u32 classid) 138 { 139 return TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_INGRESS); 140 } 141 142 static unsigned long clsact_bind_filter(struct Qdisc *sch, 143 unsigned long parent, u32 classid) 144 { 145 return clsact_get(sch, classid); 146 } 147 148 static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl) 149 { 150 struct clsact_sched_data *q = qdisc_priv(sch); 151 152 switch (cl) { 153 case TC_H_MIN(TC_H_MIN_INGRESS): 154 return q->ingress_block; 155 case TC_H_MIN(TC_H_MIN_EGRESS): 156 return q->egress_block; 157 default: 158 return NULL; 159 } 160 } 161 162 static int clsact_init(struct Qdisc *sch, struct nlattr *opt) 163 { 164 struct clsact_sched_data *q = qdisc_priv(sch); 165 struct net_device *dev = qdisc_dev(sch); 166 int err; 167 168 err = tcf_block_get(&q->ingress_block, &dev->ingress_cl_list); 169 if (err) 170 return err; 171 172 err = tcf_block_get(&q->egress_block, &dev->egress_cl_list); 173 if (err) 174 return err; 175 176 net_inc_ingress_queue(); 177 net_inc_egress_queue(); 178 179 sch->flags |= TCQ_F_CPUSTATS; 180 181 return 0; 182 } 183 184 static void clsact_destroy(struct Qdisc *sch) 185 { 186 struct clsact_sched_data *q = qdisc_priv(sch); 187 188 tcf_block_put(q->egress_block); 189 tcf_block_put(q->ingress_block); 190 191 net_dec_ingress_queue(); 192 net_dec_egress_queue(); 193 } 194 195 static const struct Qdisc_class_ops clsact_class_ops = { 196 .leaf = ingress_leaf, 197 .get = clsact_get, 198 .put = ingress_put, 199 .walk = ingress_walk, 200 .tcf_block = clsact_tcf_block, 201 .tcf_cl_offload = clsact_cl_offload, 202 .bind_tcf = clsact_bind_filter, 203 .unbind_tcf = ingress_put, 204 }; 205 206 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = { 207 .cl_ops = &clsact_class_ops, 208 .id = "clsact", 209 .priv_size = sizeof(struct clsact_sched_data), 210 .init = clsact_init, 211 .destroy = clsact_destroy, 212 .dump = ingress_dump, 213 .owner = THIS_MODULE, 214 }; 215 216 static int __init ingress_module_init(void) 217 { 218 int ret; 219 220 ret = register_qdisc(&ingress_qdisc_ops); 221 if (!ret) { 222 ret = register_qdisc(&clsact_qdisc_ops); 223 if (ret) 224 unregister_qdisc(&ingress_qdisc_ops); 225 } 226 227 return ret; 228 } 229 230 static void __exit ingress_module_exit(void) 231 { 232 unregister_qdisc(&ingress_qdisc_ops); 233 unregister_qdisc(&clsact_qdisc_ops); 234 } 235 236 module_init(ingress_module_init); 237 module_exit(ingress_module_exit); 238 239 MODULE_ALIAS("sch_clsact"); 240 MODULE_LICENSE("GPL"); 241