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 19struct ingress_qdisc_data { 20 struct tcf_proto *filter_list; 21}; 22 23/* ------------------------- Class/flow operations ------------------------- */ 24 25static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) 26{ 27 return NULL; 28} 29 30static unsigned long ingress_get(struct Qdisc *sch, u32 classid) 31{ 32 return TC_H_MIN(classid) + 1; 33} 34 35static unsigned long ingress_bind_filter(struct Qdisc *sch, 36 unsigned long parent, u32 classid) 37{ 38 return ingress_get(sch, classid); 39} 40 41static void ingress_put(struct Qdisc *sch, unsigned long cl) 42{ 43} 44 45static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) 46{ 47} 48 49static 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 58static 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 sch->bstats.packets++; 67 sch->bstats.bytes += qdisc_pkt_len(skb); 68 switch (result) { 69 case TC_ACT_SHOT: 70 result = TC_ACT_SHOT; 71 sch->qstats.drops++; 72 break; 73 case TC_ACT_STOLEN: 74 case TC_ACT_QUEUED: 75 result = TC_ACT_STOLEN; 76 break; 77 case TC_ACT_RECLASSIFY: 78 case TC_ACT_OK: 79 skb->tc_index = TC_H_MIN(res.classid); 80 default: 81 result = TC_ACT_OK; 82 break; 83 } 84 85 return result; 86} 87 88/* ------------------------------------------------------------- */ 89 90static void ingress_destroy(struct Qdisc *sch) 91{ 92 struct ingress_qdisc_data *p = qdisc_priv(sch); 93 94 tcf_destroy_chain(&p->filter_list); 95} 96 97static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) 98{ 99 struct nlattr *nest; 100 101 nest = nla_nest_start(skb, TCA_OPTIONS); 102 if (nest == NULL) 103 goto nla_put_failure; 104 nla_nest_end(skb, nest); 105 return skb->len; 106 107nla_put_failure: 108 nla_nest_cancel(skb, nest); 109 return -1; 110} 111 112static const struct Qdisc_class_ops ingress_class_ops = { 113 .leaf = ingress_leaf, 114 .get = ingress_get, 115 .put = ingress_put, 116 .walk = ingress_walk, 117 .tcf_chain = ingress_find_tcf, 118 .bind_tcf = ingress_bind_filter, 119 .unbind_tcf = ingress_put, 120}; 121 122static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { 123 .cl_ops = &ingress_class_ops, 124 .id = "ingress", 125 .priv_size = sizeof(struct ingress_qdisc_data), 126 .enqueue = ingress_enqueue, 127 .destroy = ingress_destroy, 128 .dump = ingress_dump, 129 .owner = THIS_MODULE, 130}; 131 132static int __init ingress_module_init(void) 133{ 134 return register_qdisc(&ingress_qdisc_ops); 135} 136 137static void __exit ingress_module_exit(void) 138{ 139 unregister_qdisc(&ingress_qdisc_ops); 140} 141 142module_init(ingress_module_init) 143module_exit(ingress_module_exit) 144MODULE_LICENSE("GPL"); 145