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Commit | Line | Data |
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f4009237 TG |
1 | /* |
2 | * net/sched/cls_cgroup.c Control Group Classifier | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Thomas Graf <tgraf@suug.ch> | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
f4009237 | 14 | #include <linux/skbuff.h> |
f8451725 | 15 | #include <linux/rcupdate.h> |
f4009237 TG |
16 | #include <net/rtnetlink.h> |
17 | #include <net/pkt_cls.h> | |
f8451725 HX |
18 | #include <net/sock.h> |
19 | #include <net/cls_cgroup.h> | |
f4009237 | 20 | |
cc7ec456 | 21 | struct cls_cgroup_head { |
f4009237 TG |
22 | u32 handle; |
23 | struct tcf_exts exts; | |
24 | struct tcf_ematch_tree ematches; | |
952313bd | 25 | struct tcf_proto *tp; |
b1b5b04f CW |
26 | union { |
27 | struct work_struct work; | |
28 | struct rcu_head rcu; | |
29 | }; | |
f4009237 TG |
30 | }; |
31 | ||
dc7f9f6e | 32 | static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
f4009237 TG |
33 | struct tcf_result *res) |
34 | { | |
952313bd | 35 | struct cls_cgroup_head *head = rcu_dereference_bh(tp->root); |
b87a173e | 36 | u32 classid = task_get_classid(skb); |
f4009237 | 37 | |
e65fcfd6 PM |
38 | if (!classid) |
39 | return -1; | |
e65fcfd6 PM |
40 | if (!tcf_em_tree_match(skb, &head->ematches, NULL)) |
41 | return -1; | |
42 | ||
43 | res->classid = classid; | |
44 | res->class = 0; | |
b87a173e | 45 | |
e65fcfd6 | 46 | return tcf_exts_exec(skb, &head->exts, res); |
f4009237 TG |
47 | } |
48 | ||
8113c095 | 49 | static void *cls_cgroup_get(struct tcf_proto *tp, u32 handle) |
f4009237 | 50 | { |
8113c095 | 51 | return NULL; |
f4009237 TG |
52 | } |
53 | ||
f4009237 TG |
54 | static int cls_cgroup_init(struct tcf_proto *tp) |
55 | { | |
56 | return 0; | |
57 | } | |
58 | ||
f4009237 TG |
59 | static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = { |
60 | [TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED }, | |
61 | }; | |
62 | ||
ed148168 CW |
63 | static void __cls_cgroup_destroy(struct cls_cgroup_head *head) |
64 | { | |
65 | tcf_exts_destroy(&head->exts); | |
66 | tcf_em_tree_destroy(&head->ematches); | |
67 | tcf_exts_put_net(&head->exts); | |
68 | kfree(head); | |
69 | } | |
70 | ||
b1b5b04f CW |
71 | static void cls_cgroup_destroy_work(struct work_struct *work) |
72 | { | |
73 | struct cls_cgroup_head *head = container_of(work, | |
74 | struct cls_cgroup_head, | |
75 | work); | |
76 | rtnl_lock(); | |
ed148168 | 77 | __cls_cgroup_destroy(head); |
b1b5b04f CW |
78 | rtnl_unlock(); |
79 | } | |
80 | ||
952313bd JF |
81 | static void cls_cgroup_destroy_rcu(struct rcu_head *root) |
82 | { | |
83 | struct cls_cgroup_head *head = container_of(root, | |
84 | struct cls_cgroup_head, | |
85 | rcu); | |
86 | ||
b1b5b04f CW |
87 | INIT_WORK(&head->work, cls_cgroup_destroy_work); |
88 | tcf_queue_work(&head->work); | |
952313bd JF |
89 | } |
90 | ||
c1b52739 | 91 | static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 92 | struct tcf_proto *tp, unsigned long base, |
f4009237 | 93 | u32 handle, struct nlattr **tca, |
8113c095 | 94 | void **arg, bool ovr) |
f4009237 | 95 | { |
cc7ec456 | 96 | struct nlattr *tb[TCA_CGROUP_MAX + 1]; |
952313bd JF |
97 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
98 | struct cls_cgroup_head *new; | |
f4009237 TG |
99 | int err; |
100 | ||
52ea3a56 MU |
101 | if (!tca[TCA_OPTIONS]) |
102 | return -EINVAL; | |
103 | ||
952313bd JF |
104 | if (!head && !handle) |
105 | return -EINVAL; | |
f4009237 | 106 | |
952313bd JF |
107 | if (head && handle != head->handle) |
108 | return -ENOENT; | |
f4009237 | 109 | |
952313bd JF |
110 | new = kzalloc(sizeof(*head), GFP_KERNEL); |
111 | if (!new) | |
112 | return -ENOBUFS; | |
f4009237 | 113 | |
b9a24bb7 WC |
114 | err = tcf_exts_init(&new->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE); |
115 | if (err < 0) | |
116 | goto errout; | |
18b5427a | 117 | new->handle = handle; |
952313bd | 118 | new->tp = tp; |
f4009237 | 119 | err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS], |
fceb6435 | 120 | cgroup_policy, NULL); |
f4009237 | 121 | if (err < 0) |
d14cbfc8 | 122 | goto errout; |
f4009237 | 123 | |
8cc62513 | 124 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, ovr); |
f4009237 | 125 | if (err < 0) |
d14cbfc8 | 126 | goto errout; |
f4009237 | 127 | |
4ebc1e3c | 128 | err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches); |
8cc62513 | 129 | if (err < 0) |
d14cbfc8 | 130 | goto errout; |
f4009237 | 131 | |
952313bd | 132 | rcu_assign_pointer(tp->root, new); |
ed148168 CW |
133 | if (head) { |
134 | tcf_exts_get_net(&head->exts); | |
952313bd | 135 | call_rcu(&head->rcu, cls_cgroup_destroy_rcu); |
ed148168 | 136 | } |
f4009237 | 137 | return 0; |
d14cbfc8 | 138 | errout: |
b9a24bb7 | 139 | tcf_exts_destroy(&new->exts); |
d14cbfc8 JF |
140 | kfree(new); |
141 | return err; | |
f4009237 TG |
142 | } |
143 | ||
763dbf63 | 144 | static void cls_cgroup_destroy(struct tcf_proto *tp) |
f4009237 | 145 | { |
952313bd | 146 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 | 147 | |
d9363774 | 148 | /* Head can still be NULL due to cls_cgroup_init(). */ |
ed148168 CW |
149 | if (head) { |
150 | if (tcf_exts_get_net(&head->exts)) | |
151 | call_rcu(&head->rcu, cls_cgroup_destroy_rcu); | |
152 | else | |
153 | __cls_cgroup_destroy(head); | |
154 | } | |
f4009237 TG |
155 | } |
156 | ||
8113c095 | 157 | static int cls_cgroup_delete(struct tcf_proto *tp, void *arg, bool *last) |
f4009237 TG |
158 | { |
159 | return -EOPNOTSUPP; | |
160 | } | |
161 | ||
162 | static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
163 | { | |
952313bd | 164 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
165 | |
166 | if (arg->count < arg->skip) | |
167 | goto skip; | |
168 | ||
8113c095 | 169 | if (arg->fn(tp, head, arg) < 0) { |
f4009237 TG |
170 | arg->stop = 1; |
171 | return; | |
172 | } | |
173 | skip: | |
174 | arg->count++; | |
175 | } | |
176 | ||
8113c095 | 177 | static int cls_cgroup_dump(struct net *net, struct tcf_proto *tp, void *fh, |
f4009237 TG |
178 | struct sk_buff *skb, struct tcmsg *t) |
179 | { | |
952313bd | 180 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
181 | struct nlattr *nest; |
182 | ||
183 | t->tcm_handle = head->handle; | |
184 | ||
185 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
186 | if (nest == NULL) | |
187 | goto nla_put_failure; | |
188 | ||
5da57f42 | 189 | if (tcf_exts_dump(skb, &head->exts) < 0 || |
f4009237 TG |
190 | tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0) |
191 | goto nla_put_failure; | |
192 | ||
193 | nla_nest_end(skb, nest); | |
194 | ||
5da57f42 | 195 | if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
f4009237 TG |
196 | goto nla_put_failure; |
197 | ||
198 | return skb->len; | |
199 | ||
200 | nla_put_failure: | |
6ea3b446 | 201 | nla_nest_cancel(skb, nest); |
f4009237 TG |
202 | return -1; |
203 | } | |
204 | ||
205 | static struct tcf_proto_ops cls_cgroup_ops __read_mostly = { | |
206 | .kind = "cgroup", | |
207 | .init = cls_cgroup_init, | |
208 | .change = cls_cgroup_change, | |
209 | .classify = cls_cgroup_classify, | |
210 | .destroy = cls_cgroup_destroy, | |
211 | .get = cls_cgroup_get, | |
f4009237 TG |
212 | .delete = cls_cgroup_delete, |
213 | .walk = cls_cgroup_walk, | |
214 | .dump = cls_cgroup_dump, | |
215 | .owner = THIS_MODULE, | |
216 | }; | |
217 | ||
218 | static int __init init_cgroup_cls(void) | |
219 | { | |
fe1217c4 | 220 | return register_tcf_proto_ops(&cls_cgroup_ops); |
f4009237 TG |
221 | } |
222 | ||
223 | static void __exit exit_cgroup_cls(void) | |
224 | { | |
225 | unregister_tcf_proto_ops(&cls_cgroup_ops); | |
226 | } | |
227 | ||
228 | module_init(init_cgroup_cls); | |
229 | module_exit(exit_cgroup_cls); | |
230 | MODULE_LICENSE("GPL"); |