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 20 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) 21 { 22 return NULL; 23 } 24 25 static unsigned long ingress_get(struct Qdisc *sch, u32 classid) 26 { 27 return TC_H_MIN(classid) + 1; 28 } 29 30 static bool ingress_cl_offload(u32 classid) 31 { 32 return true; 33 } 34 35 static unsigned long ingress_bind_filter(struct Qdisc *sch, 36 unsigned long parent, u32 classid) 37 { 38 return ingress_get(sch, classid); 39 } 40 41 static void ingress_put(struct Qdisc *sch, unsigned long cl) 42 { 43 } 44 45 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) 46 { 47 } 48 49 static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch, 50 unsigned long cl) 51 { 52 struct net_device *dev = qdisc_dev(sch); 53 54 return &dev->ingress_cl_list; 55 } 56 57 static int ingress_init(struct Qdisc *sch, struct nlattr *opt) 58 { 59 net_inc_ingress_queue(); 60 sch->flags |= TCQ_F_CPUSTATS; 61 62 return 0; 63 } 64 65 static void ingress_destroy(struct Qdisc *sch) 66 { 67 struct net_device *dev = qdisc_dev(sch); 68 69 tcf_destroy_chain(&dev->ingress_cl_list); 70 net_dec_ingress_queue(); 71 } 72 73 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 74 { 75 struct nlattr *nest; 76 77 nest = nla_nest_start(skb, TCA_OPTIONS); 78 if (nest == NULL) 79 goto nla_put_failure; 80 81 return nla_nest_end(skb, nest); 82 83 nla_put_failure: 84 nla_nest_cancel(skb, nest); 85 return -1; 86 } 87 88 static const struct Qdisc_class_ops ingress_class_ops = { 89 .leaf = ingress_leaf, 90 .get = ingress_get, 91 .put = ingress_put, 92 .walk = ingress_walk, 93 .tcf_chain = ingress_find_tcf, 94 .tcf_cl_offload = ingress_cl_offload, 95 .bind_tcf = ingress_bind_filter, 96 .unbind_tcf = ingress_put, 97 }; 98 99 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { 100 .cl_ops = &ingress_class_ops, 101 .id = "ingress", 102 .init = ingress_init, 103 .destroy = ingress_destroy, 104 .dump = ingress_dump, 105 .owner = THIS_MODULE, 106 }; 107 108 static unsigned long clsact_get(struct Qdisc *sch, u32 classid) 109 { 110 switch (TC_H_MIN(classid)) { 111 case TC_H_MIN(TC_H_MIN_INGRESS): 112 case TC_H_MIN(TC_H_MIN_EGRESS): 113 return TC_H_MIN(classid); 114 default: 115 return 0; 116 } 117 } 118 119 static bool clsact_cl_offload(u32 classid) 120 { 121 return TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_INGRESS); 122 } 123 124 static unsigned long clsact_bind_filter(struct Qdisc *sch, 125 unsigned long parent, u32 classid) 126 { 127 return clsact_get(sch, classid); 128 } 129 130 static struct tcf_proto __rcu **clsact_find_tcf(struct Qdisc *sch, 131 unsigned long cl) 132 { 133 struct net_device *dev = qdisc_dev(sch); 134 135 switch (cl) { 136 case TC_H_MIN(TC_H_MIN_INGRESS): 137 return &dev->ingress_cl_list; 138 case TC_H_MIN(TC_H_MIN_EGRESS): 139 return &dev->egress_cl_list; 140 default: 141 return NULL; 142 } 143 } 144 145 static int clsact_init(struct Qdisc *sch, struct nlattr *opt) 146 { 147 net_inc_ingress_queue(); 148 net_inc_egress_queue(); 149 150 sch->flags |= TCQ_F_CPUSTATS; 151 152 return 0; 153 } 154 155 static void clsact_destroy(struct Qdisc *sch) 156 { 157 struct net_device *dev = qdisc_dev(sch); 158 159 tcf_destroy_chain(&dev->ingress_cl_list); 160 tcf_destroy_chain(&dev->egress_cl_list); 161 162 net_dec_ingress_queue(); 163 net_dec_egress_queue(); 164 } 165 166 static const struct Qdisc_class_ops clsact_class_ops = { 167 .leaf = ingress_leaf, 168 .get = clsact_get, 169 .put = ingress_put, 170 .walk = ingress_walk, 171 .tcf_chain = clsact_find_tcf, 172 .tcf_cl_offload = clsact_cl_offload, 173 .bind_tcf = clsact_bind_filter, 174 .unbind_tcf = ingress_put, 175 }; 176 177 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = { 178 .cl_ops = &clsact_class_ops, 179 .id = "clsact", 180 .init = clsact_init, 181 .destroy = clsact_destroy, 182 .dump = ingress_dump, 183 .owner = THIS_MODULE, 184 }; 185 186 static int __init ingress_module_init(void) 187 { 188 int ret; 189 190 ret = register_qdisc(&ingress_qdisc_ops); 191 if (!ret) { 192 ret = register_qdisc(&clsact_qdisc_ops); 193 if (ret) 194 unregister_qdisc(&ingress_qdisc_ops); 195 } 196 197 return ret; 198 } 199 200 static void __exit ingress_module_exit(void) 201 { 202 unregister_qdisc(&ingress_qdisc_ops); 203 unregister_qdisc(&clsact_qdisc_ops); 204 } 205 206 module_init(ingress_module_init); 207 module_exit(ingress_module_exit); 208 209 MODULE_ALIAS("sch_clsact"); 210 MODULE_LICENSE("GPL"); 211