1 /* net/sched/sch_ingress.c - Ingress qdisc 2 * This program is free software; you can redistribute it and/or 3 * modify it under the terms of the GNU General Public License 4 * as published by the Free Software Foundation; either version 5 * 2 of the License, or (at your option) any later version. 6 * 7 * Authors: Jamal Hadi Salim 1999 8 */ 9 10 #include <linux/module.h> 11 #include <linux/types.h> 12 #include <linux/list.h> 13 #include <linux/skbuff.h> 14 #include <linux/rtnetlink.h> 15 #include <net/netlink.h> 16 #include <net/pkt_sched.h> 17 18 19 struct ingress_qdisc_data { 20 struct tcf_proto *filter_list; 21 }; 22 23 /* ------------------------- Class/flow operations ------------------------- */ 24 25 static int ingress_graft(struct Qdisc *sch, unsigned long arg, 26 struct Qdisc *new, struct Qdisc **old) 27 { 28 return -EOPNOTSUPP; 29 } 30 31 static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) 32 { 33 return NULL; 34 } 35 36 static unsigned long ingress_get(struct Qdisc *sch, u32 classid) 37 { 38 return TC_H_MIN(classid) + 1; 39 } 40 41 static unsigned long ingress_bind_filter(struct Qdisc *sch, 42 unsigned long parent, u32 classid) 43 { 44 return ingress_get(sch, classid); 45 } 46 47 static void ingress_put(struct Qdisc *sch, unsigned long cl) 48 { 49 } 50 51 static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent, 52 struct nlattr **tca, unsigned long *arg) 53 { 54 return 0; 55 } 56 57 static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) 58 { 59 return; 60 } 61 62 static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl) 63 { 64 struct ingress_qdisc_data *p = qdisc_priv(sch); 65 66 return &p->filter_list; 67 } 68 69 /* --------------------------- Qdisc operations ---------------------------- */ 70 71 static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch) 72 { 73 struct ingress_qdisc_data *p = qdisc_priv(sch); 74 struct tcf_result res; 75 int result; 76 77 result = tc_classify(skb, p->filter_list, &res); 78 79 sch->bstats.packets++; 80 sch->bstats.bytes += skb->len; 81 switch (result) { 82 case TC_ACT_SHOT: 83 result = TC_ACT_SHOT; 84 sch->qstats.drops++; 85 break; 86 case TC_ACT_STOLEN: 87 case TC_ACT_QUEUED: 88 result = TC_ACT_STOLEN; 89 break; 90 case TC_ACT_RECLASSIFY: 91 case TC_ACT_OK: 92 skb->tc_index = TC_H_MIN(res.classid); 93 default: 94 result = TC_ACT_OK; 95 break; 96 } 97 98 return result; 99 } 100 101 /* ------------------------------------------------------------- */ 102 103 static void ingress_destroy(struct Qdisc *sch) 104 { 105 struct ingress_qdisc_data *p = qdisc_priv(sch); 106 107 tcf_destroy_chain(p->filter_list); 108 } 109 110 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 111 { 112 struct nlattr *nest; 113 114 nest = nla_nest_start(skb, TCA_OPTIONS); 115 if (nest == NULL) 116 goto nla_put_failure; 117 nla_nest_end(skb, nest); 118 return skb->len; 119 120 nla_put_failure: 121 nla_nest_cancel(skb, nest); 122 return -1; 123 } 124 125 static const struct Qdisc_class_ops ingress_class_ops = { 126 .graft = ingress_graft, 127 .leaf = ingress_leaf, 128 .get = ingress_get, 129 .put = ingress_put, 130 .change = ingress_change, 131 .walk = ingress_walk, 132 .tcf_chain = ingress_find_tcf, 133 .bind_tcf = ingress_bind_filter, 134 .unbind_tcf = ingress_put, 135 }; 136 137 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { 138 .cl_ops = &ingress_class_ops, 139 .id = "ingress", 140 .priv_size = sizeof(struct ingress_qdisc_data), 141 .enqueue = ingress_enqueue, 142 .destroy = ingress_destroy, 143 .dump = ingress_dump, 144 .owner = THIS_MODULE, 145 }; 146 147 static int __init ingress_module_init(void) 148 { 149 return register_qdisc(&ingress_qdisc_ops); 150 } 151 152 static void __exit ingress_module_exit(void) 153 { 154 unregister_qdisc(&ingress_qdisc_ops); 155 } 156 157 module_init(ingress_module_init) 158 module_exit(ingress_module_exit) 159 MODULE_LICENSE("GPL"); 160