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 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) 22 { 23 return NULL; 24 } 25 26 static unsigned long ingress_get(struct Qdisc *sch, u32 classid) 27 { 28 return TC_H_MIN(classid) + 1; 29 } 30 31 static bool ingress_cl_offload(u32 classid) 32 { 33 return true; 34 } 35 36 static unsigned long ingress_bind_filter(struct Qdisc *sch, 37 unsigned long parent, u32 classid) 38 { 39 return ingress_get(sch, classid); 40 } 41 42 static void ingress_put(struct Qdisc *sch, unsigned long cl) 43 { 44 } 45 46 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) 47 { 48 } 49 50 static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch, 51 unsigned long cl) 52 { 53 struct net_device *dev = qdisc_dev(sch); 54 55 return &dev->ingress_cl_list; 56 } 57 58 static int ingress_init(struct Qdisc *sch, struct nlattr *opt) 59 { 60 net_inc_ingress_queue(); 61 sch->flags |= TCQ_F_CPUSTATS; 62 63 return 0; 64 } 65 66 static void ingress_destroy(struct Qdisc *sch) 67 { 68 struct net_device *dev = qdisc_dev(sch); 69 70 tcf_destroy_chain(&dev->ingress_cl_list); 71 net_dec_ingress_queue(); 72 } 73 74 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 75 { 76 struct nlattr *nest; 77 78 nest = nla_nest_start(skb, TCA_OPTIONS); 79 if (nest == NULL) 80 goto nla_put_failure; 81 82 return nla_nest_end(skb, nest); 83 84 nla_put_failure: 85 nla_nest_cancel(skb, nest); 86 return -1; 87 } 88 89 static const struct Qdisc_class_ops ingress_class_ops = { 90 .leaf = ingress_leaf, 91 .get = ingress_get, 92 .put = ingress_put, 93 .walk = ingress_walk, 94 .tcf_chain = ingress_find_tcf, 95 .tcf_cl_offload = ingress_cl_offload, 96 .bind_tcf = ingress_bind_filter, 97 .unbind_tcf = ingress_put, 98 }; 99 100 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { 101 .cl_ops = &ingress_class_ops, 102 .id = "ingress", 103 .init = ingress_init, 104 .destroy = ingress_destroy, 105 .dump = ingress_dump, 106 .owner = THIS_MODULE, 107 }; 108 109 static unsigned long clsact_get(struct Qdisc *sch, u32 classid) 110 { 111 switch (TC_H_MIN(classid)) { 112 case TC_H_MIN(TC_H_MIN_INGRESS): 113 case TC_H_MIN(TC_H_MIN_EGRESS): 114 return TC_H_MIN(classid); 115 default: 116 return 0; 117 } 118 } 119 120 static bool clsact_cl_offload(u32 classid) 121 { 122 return TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_INGRESS); 123 } 124 125 static unsigned long clsact_bind_filter(struct Qdisc *sch, 126 unsigned long parent, u32 classid) 127 { 128 return clsact_get(sch, classid); 129 } 130 131 static struct tcf_proto __rcu **clsact_find_tcf(struct Qdisc *sch, 132 unsigned long cl) 133 { 134 struct net_device *dev = qdisc_dev(sch); 135 136 switch (cl) { 137 case TC_H_MIN(TC_H_MIN_INGRESS): 138 return &dev->ingress_cl_list; 139 case TC_H_MIN(TC_H_MIN_EGRESS): 140 return &dev->egress_cl_list; 141 default: 142 return NULL; 143 } 144 } 145 146 static int clsact_init(struct Qdisc *sch, struct nlattr *opt) 147 { 148 net_inc_ingress_queue(); 149 net_inc_egress_queue(); 150 151 sch->flags |= TCQ_F_CPUSTATS; 152 153 return 0; 154 } 155 156 static void clsact_destroy(struct Qdisc *sch) 157 { 158 struct net_device *dev = qdisc_dev(sch); 159 160 tcf_destroy_chain(&dev->ingress_cl_list); 161 tcf_destroy_chain(&dev->egress_cl_list); 162 163 net_dec_ingress_queue(); 164 net_dec_egress_queue(); 165 } 166 167 static const struct Qdisc_class_ops clsact_class_ops = { 168 .leaf = ingress_leaf, 169 .get = clsact_get, 170 .put = ingress_put, 171 .walk = ingress_walk, 172 .tcf_chain = clsact_find_tcf, 173 .tcf_cl_offload = clsact_cl_offload, 174 .bind_tcf = clsact_bind_filter, 175 .unbind_tcf = ingress_put, 176 }; 177 178 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = { 179 .cl_ops = &clsact_class_ops, 180 .id = "clsact", 181 .init = clsact_init, 182 .destroy = clsact_destroy, 183 .dump = ingress_dump, 184 .owner = THIS_MODULE, 185 }; 186 187 static int __init ingress_module_init(void) 188 { 189 int ret; 190 191 ret = register_qdisc(&ingress_qdisc_ops); 192 if (!ret) { 193 ret = register_qdisc(&clsact_qdisc_ops); 194 if (ret) 195 unregister_qdisc(&ingress_qdisc_ops); 196 } 197 198 return ret; 199 } 200 201 static void __exit ingress_module_exit(void) 202 { 203 unregister_qdisc(&ingress_qdisc_ops); 204 unregister_qdisc(&clsact_qdisc_ops); 205 } 206 207 module_init(ingress_module_init); 208 module_exit(ingress_module_exit); 209 210 MODULE_ALIAS("sch_clsact"); 211 MODULE_LICENSE("GPL"); 212