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1 | /* net/sched/sch_ingress.c - Ingress and clsact qdisc | |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of the GNU General Public License | |
5 | * as published by the Free Software Foundation; either version | |
6 | * 2 of the License, or (at your option) any later version. | |
7 | * | |
8 | * Authors: Jamal Hadi Salim 1999 | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/rtnetlink.h> | |
16 | ||
17 | #include <net/netlink.h> | |
18 | #include <net/pkt_sched.h> | |
19 | #include <net/pkt_cls.h> | |
20 | ||
21 | struct ingress_sched_data { | |
22 | struct tcf_block *block; | |
23 | }; | |
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 bool ingress_cl_offload(u32 classid) | |
36 | { | |
37 | return true; | |
38 | } | |
39 | ||
40 | static unsigned long ingress_bind_filter(struct Qdisc *sch, | |
41 | unsigned long parent, u32 classid) | |
42 | { | |
43 | return ingress_get(sch, classid); | |
44 | } | |
45 | ||
46 | static void ingress_put(struct Qdisc *sch, unsigned long cl) | |
47 | { | |
48 | } | |
49 | ||
50 | static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) | |
51 | { | |
52 | } | |
53 | ||
54 | static struct tcf_block *ingress_tcf_block(struct Qdisc *sch, unsigned long cl) | |
55 | { | |
56 | struct ingress_sched_data *q = qdisc_priv(sch); | |
57 | ||
58 | return q->block; | |
59 | } | |
60 | ||
61 | static int ingress_init(struct Qdisc *sch, struct nlattr *opt) | |
62 | { | |
63 | struct ingress_sched_data *q = qdisc_priv(sch); | |
64 | struct net_device *dev = qdisc_dev(sch); | |
65 | int err; | |
66 | ||
67 | err = tcf_block_get(&q->block, &dev->ingress_cl_list); | |
68 | if (err) | |
69 | return err; | |
70 | ||
71 | net_inc_ingress_queue(); | |
72 | sch->flags |= TCQ_F_CPUSTATS; | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static void ingress_destroy(struct Qdisc *sch) | |
78 | { | |
79 | struct ingress_sched_data *q = qdisc_priv(sch); | |
80 | ||
81 | tcf_block_put(q->block); | |
82 | net_dec_ingress_queue(); | |
83 | } | |
84 | ||
85 | static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) | |
86 | { | |
87 | struct nlattr *nest; | |
88 | ||
89 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
90 | if (nest == NULL) | |
91 | goto nla_put_failure; | |
92 | ||
93 | return nla_nest_end(skb, nest); | |
94 | ||
95 | nla_put_failure: | |
96 | nla_nest_cancel(skb, nest); | |
97 | return -1; | |
98 | } | |
99 | ||
100 | static const struct Qdisc_class_ops ingress_class_ops = { | |
101 | .leaf = ingress_leaf, | |
102 | .get = ingress_get, | |
103 | .put = ingress_put, | |
104 | .walk = ingress_walk, | |
105 | .tcf_block = ingress_tcf_block, | |
106 | .tcf_cl_offload = ingress_cl_offload, | |
107 | .bind_tcf = ingress_bind_filter, | |
108 | .unbind_tcf = ingress_put, | |
109 | }; | |
110 | ||
111 | static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { | |
112 | .cl_ops = &ingress_class_ops, | |
113 | .id = "ingress", | |
114 | .priv_size = sizeof(struct ingress_sched_data), | |
115 | .init = ingress_init, | |
116 | .destroy = ingress_destroy, | |
117 | .dump = ingress_dump, | |
118 | .owner = THIS_MODULE, | |
119 | }; | |
120 | ||
121 | struct clsact_sched_data { | |
122 | struct tcf_block *ingress_block; | |
123 | struct tcf_block *egress_block; | |
124 | }; | |
125 | ||
126 | static unsigned long clsact_get(struct Qdisc *sch, u32 classid) | |
127 | { | |
128 | switch (TC_H_MIN(classid)) { | |
129 | case TC_H_MIN(TC_H_MIN_INGRESS): | |
130 | case TC_H_MIN(TC_H_MIN_EGRESS): | |
131 | return TC_H_MIN(classid); | |
132 | default: | |
133 | return 0; | |
134 | } | |
135 | } | |
136 | ||
137 | static bool clsact_cl_offload(u32 classid) | |
138 | { | |
139 | return TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_INGRESS); | |
140 | } | |
141 | ||
142 | static unsigned long clsact_bind_filter(struct Qdisc *sch, | |
143 | unsigned long parent, u32 classid) | |
144 | { | |
145 | return clsact_get(sch, classid); | |
146 | } | |
147 | ||
148 | static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl) | |
149 | { | |
150 | struct clsact_sched_data *q = qdisc_priv(sch); | |
151 | ||
152 | switch (cl) { | |
153 | case TC_H_MIN(TC_H_MIN_INGRESS): | |
154 | return q->ingress_block; | |
155 | case TC_H_MIN(TC_H_MIN_EGRESS): | |
156 | return q->egress_block; | |
157 | default: | |
158 | return NULL; | |
159 | } | |
160 | } | |
161 | ||
162 | static int clsact_init(struct Qdisc *sch, struct nlattr *opt) | |
163 | { | |
164 | struct clsact_sched_data *q = qdisc_priv(sch); | |
165 | struct net_device *dev = qdisc_dev(sch); | |
166 | int err; | |
167 | ||
168 | err = tcf_block_get(&q->ingress_block, &dev->ingress_cl_list); | |
169 | if (err) | |
170 | return err; | |
171 | ||
172 | err = tcf_block_get(&q->egress_block, &dev->egress_cl_list); | |
173 | if (err) | |
174 | return err; | |
175 | ||
176 | net_inc_ingress_queue(); | |
177 | net_inc_egress_queue(); | |
178 | ||
179 | sch->flags |= TCQ_F_CPUSTATS; | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | static void clsact_destroy(struct Qdisc *sch) | |
185 | { | |
186 | struct clsact_sched_data *q = qdisc_priv(sch); | |
187 | ||
188 | tcf_block_put(q->egress_block); | |
189 | tcf_block_put(q->ingress_block); | |
190 | ||
191 | net_dec_ingress_queue(); | |
192 | net_dec_egress_queue(); | |
193 | } | |
194 | ||
195 | static const struct Qdisc_class_ops clsact_class_ops = { | |
196 | .leaf = ingress_leaf, | |
197 | .get = clsact_get, | |
198 | .put = ingress_put, | |
199 | .walk = ingress_walk, | |
200 | .tcf_block = clsact_tcf_block, | |
201 | .tcf_cl_offload = clsact_cl_offload, | |
202 | .bind_tcf = clsact_bind_filter, | |
203 | .unbind_tcf = ingress_put, | |
204 | }; | |
205 | ||
206 | static struct Qdisc_ops clsact_qdisc_ops __read_mostly = { | |
207 | .cl_ops = &clsact_class_ops, | |
208 | .id = "clsact", | |
209 | .priv_size = sizeof(struct clsact_sched_data), | |
210 | .init = clsact_init, | |
211 | .destroy = clsact_destroy, | |
212 | .dump = ingress_dump, | |
213 | .owner = THIS_MODULE, | |
214 | }; | |
215 | ||
216 | static int __init ingress_module_init(void) | |
217 | { | |
218 | int ret; | |
219 | ||
220 | ret = register_qdisc(&ingress_qdisc_ops); | |
221 | if (!ret) { | |
222 | ret = register_qdisc(&clsact_qdisc_ops); | |
223 | if (ret) | |
224 | unregister_qdisc(&ingress_qdisc_ops); | |
225 | } | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | static void __exit ingress_module_exit(void) | |
231 | { | |
232 | unregister_qdisc(&ingress_qdisc_ops); | |
233 | unregister_qdisc(&clsact_qdisc_ops); | |
234 | } | |
235 | ||
236 | module_init(ingress_module_init); | |
237 | module_exit(ingress_module_exit); | |
238 | ||
239 | MODULE_ALIAS("sch_clsact"); | |
240 | MODULE_LICENSE("GPL"); |