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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
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
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 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
89static 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
96static 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
106nla_put_failure:
107 nla_nest_cancel(skb, nest);
108 return -1;
109}
110
111static 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
121static 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
131static int __init ingress_module_init(void)
132{
133 return register_qdisc(&ingress_qdisc_ops);
134}
135
136static void __exit ingress_module_exit(void)
137{
138 unregister_qdisc(&ingress_qdisc_ops);
139}
140
141module_init(ingress_module_init)
142module_exit(ingress_module_exit)
143MODULE_LICENSE("GPL");
144
