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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 return;
48}
49
50static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
51{
52 struct ingress_qdisc_data *p = qdisc_priv(sch);
53
54 return &p->filter_list;
55}
56
57
58
59static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
60{
61 struct ingress_qdisc_data *p = qdisc_priv(sch);
62 struct tcf_result res;
63 int result;
64
65 result = tc_classify(skb, p->filter_list, &res);
66
67 sch->bstats.packets++;
68 sch->bstats.bytes += qdisc_pkt_len(skb);
69 switch (result) {
70 case TC_ACT_SHOT:
71 result = TC_ACT_SHOT;
72 sch->qstats.drops++;
73 break;
74 case TC_ACT_STOLEN:
75 case TC_ACT_QUEUED:
76 result = TC_ACT_STOLEN;
77 break;
78 case TC_ACT_RECLASSIFY:
79 case TC_ACT_OK:
80 skb->tc_index = TC_H_MIN(res.classid);
81 default:
82 result = TC_ACT_OK;
83 break;
84 }
85
86 return result;
87}
88
89
90
91static void ingress_destroy(struct Qdisc *sch)
92{
93 struct ingress_qdisc_data *p = qdisc_priv(sch);
94
95 tcf_destroy_chain(&p->filter_list);
96}
97
98static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
99{
100 struct nlattr *nest;
101
102 nest = nla_nest_start(skb, TCA_OPTIONS);
103 if (nest == NULL)
104 goto nla_put_failure;
105 nla_nest_end(skb, nest);
106 return skb->len;
107
108nla_put_failure:
109 nla_nest_cancel(skb, nest);
110 return -1;
111}
112
113static const struct Qdisc_class_ops ingress_class_ops = {
114 .leaf = ingress_leaf,
115 .get = ingress_get,
116 .put = ingress_put,
117 .walk = ingress_walk,
118 .tcf_chain = ingress_find_tcf,
119 .bind_tcf = ingress_bind_filter,
120 .unbind_tcf = ingress_put,
121};
122
123static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
124 .cl_ops = &ingress_class_ops,
125 .id = "ingress",
126 .priv_size = sizeof(struct ingress_qdisc_data),
127 .enqueue = ingress_enqueue,
128 .destroy = ingress_destroy,
129 .dump = ingress_dump,
130 .owner = THIS_MODULE,
131};
132
133static int __init ingress_module_init(void)
134{
135 return register_qdisc(&ingress_qdisc_ops);
136}
137
138static void __exit ingress_module_exit(void)
139{
140 unregister_qdisc(&ingress_qdisc_ops);
141}
142
143module_init(ingress_module_init)
144module_exit(ingress_module_exit)
145MODULE_LICENSE("GPL");
146
