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 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 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 **ingress_find_tcf(struct Qdisc *sch, unsigned long cl) 50 { 51 struct ingress_qdisc_data *p = qdisc_priv(sch); 52 53 return &p->filter_list; 54 } 55 56 /* --------------------------- Qdisc operations ---------------------------- */ 57 58 static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch) 59 { 60 struct ingress_qdisc_data *p = qdisc_priv(sch); 61 struct tcf_result res; 62 int result; 63 64 result = tc_classify(skb, p->filter_list, &res); 65 66 qdisc_bstats_update(sch, skb); 67 switch (result) { 68 case TC_ACT_SHOT: 69 result = TC_ACT_SHOT; 70 sch->qstats.drops++; 71 break; 72 case TC_ACT_STOLEN: 73 case TC_ACT_QUEUED: 74 result = TC_ACT_STOLEN; 75 break; 76 case TC_ACT_RECLASSIFY: 77 case TC_ACT_OK: 78 skb->tc_index = TC_H_MIN(res.classid); 79 default: 80 result = TC_ACT_OK; 81 break; 82 } 83 84 return result; 85 } 86 87 /* ------------------------------------------------------------- */ 88 89 static void ingress_destroy(struct Qdisc *sch) 90 { 91 struct ingress_qdisc_data *p = qdisc_priv(sch); 92 93 tcf_destroy_chain(&p->filter_list); 94 } 95 96 static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 97 { 98 struct nlattr *nest; 99 100 nest = nla_nest_start(skb, TCA_OPTIONS); 101 if (nest == NULL) 102 goto nla_put_failure; 103 nla_nest_end(skb, nest); 104 return skb->len; 105 106 nla_put_failure: 107 nla_nest_cancel(skb, nest); 108 return -1; 109 } 110 111 static const struct Qdisc_class_ops ingress_class_ops = { 112 .leaf = ingress_leaf, 113 .get = ingress_get, 114 .put = ingress_put, 115 .walk = ingress_walk, 116 .tcf_chain = ingress_find_tcf, 117 .bind_tcf = ingress_bind_filter, 118 .unbind_tcf = ingress_put, 119 }; 120 121 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { 122 .cl_ops = &ingress_class_ops, 123 .id = "ingress", 124 .priv_size = sizeof(struct ingress_qdisc_data), 125 .enqueue = ingress_enqueue, 126 .destroy = ingress_destroy, 127 .dump = ingress_dump, 128 .owner = THIS_MODULE, 129 }; 130 131 static int __init ingress_module_init(void) 132 { 133 return register_qdisc(&ingress_qdisc_ops); 134 } 135 136 static void __exit ingress_module_exit(void) 137 { 138 unregister_qdisc(&ingress_qdisc_ops); 139 } 140 141 module_init(ingress_module_init) 142 module_exit(ingress_module_exit) 143 MODULE_LICENSE("GPL"); 144