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Merge branch 'connlimit' of git://dev.medozas.de/linux
[mirror_ubuntu-bionic-kernel.git] / net / sched / sch_ingress.c
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");