net_sched: factorize qdisc stats handling
[linux-2.6.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");