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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 JF |
25 | struct tcf_proto *tp; |
26 | struct rcu_head rcu; | |
f4009237 TG |
27 | }; |
28 | ||
dc7f9f6e | 29 | static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
f4009237 TG |
30 | struct tcf_result *res) |
31 | { | |
952313bd | 32 | struct cls_cgroup_head *head = rcu_dereference_bh(tp->root); |
b87a173e | 33 | u32 classid = task_get_classid(skb); |
f4009237 | 34 | |
e65fcfd6 PM |
35 | if (!classid) |
36 | return -1; | |
e65fcfd6 PM |
37 | if (!tcf_em_tree_match(skb, &head->ematches, NULL)) |
38 | return -1; | |
39 | ||
40 | res->classid = classid; | |
41 | res->class = 0; | |
b87a173e | 42 | |
e65fcfd6 | 43 | return tcf_exts_exec(skb, &head->exts, res); |
f4009237 TG |
44 | } |
45 | ||
46 | static unsigned long cls_cgroup_get(struct tcf_proto *tp, u32 handle) | |
47 | { | |
48 | return 0UL; | |
49 | } | |
50 | ||
f4009237 TG |
51 | static int cls_cgroup_init(struct tcf_proto *tp) |
52 | { | |
53 | return 0; | |
54 | } | |
55 | ||
f4009237 TG |
56 | static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = { |
57 | [TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED }, | |
58 | }; | |
59 | ||
952313bd JF |
60 | static void cls_cgroup_destroy_rcu(struct rcu_head *root) |
61 | { | |
62 | struct cls_cgroup_head *head = container_of(root, | |
63 | struct cls_cgroup_head, | |
64 | rcu); | |
65 | ||
18d0264f | 66 | tcf_exts_destroy(&head->exts); |
82a470f1 | 67 | tcf_em_tree_destroy(&head->ematches); |
952313bd JF |
68 | kfree(head); |
69 | } | |
70 | ||
c1b52739 | 71 | static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 72 | struct tcf_proto *tp, unsigned long base, |
f4009237 | 73 | u32 handle, struct nlattr **tca, |
2f7ef2f8 | 74 | unsigned long *arg, bool ovr) |
f4009237 | 75 | { |
cc7ec456 | 76 | struct nlattr *tb[TCA_CGROUP_MAX + 1]; |
952313bd JF |
77 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
78 | struct cls_cgroup_head *new; | |
f4009237 TG |
79 | struct tcf_ematch_tree t; |
80 | struct tcf_exts e; | |
81 | int err; | |
82 | ||
52ea3a56 MU |
83 | if (!tca[TCA_OPTIONS]) |
84 | return -EINVAL; | |
85 | ||
952313bd JF |
86 | if (!head && !handle) |
87 | return -EINVAL; | |
f4009237 | 88 | |
952313bd JF |
89 | if (head && handle != head->handle) |
90 | return -ENOENT; | |
f4009237 | 91 | |
952313bd JF |
92 | new = kzalloc(sizeof(*head), GFP_KERNEL); |
93 | if (!new) | |
94 | return -ENOBUFS; | |
f4009237 | 95 | |
b9a24bb7 WC |
96 | err = tcf_exts_init(&new->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE); |
97 | if (err < 0) | |
98 | goto errout; | |
18b5427a | 99 | new->handle = handle; |
952313bd | 100 | new->tp = tp; |
f4009237 TG |
101 | err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS], |
102 | cgroup_policy); | |
103 | if (err < 0) | |
d14cbfc8 | 104 | goto errout; |
f4009237 | 105 | |
b9a24bb7 | 106 | err = tcf_exts_init(&e, TCA_CGROUP_ACT, TCA_CGROUP_POLICE); |
f4009237 | 107 | if (err < 0) |
d14cbfc8 | 108 | goto errout; |
b9a24bb7 WC |
109 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr); |
110 | if (err < 0) { | |
111 | tcf_exts_destroy(&e); | |
112 | goto errout; | |
113 | } | |
f4009237 TG |
114 | |
115 | err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &t); | |
d14cbfc8 | 116 | if (err < 0) { |
18d0264f | 117 | tcf_exts_destroy(&e); |
d14cbfc8 JF |
118 | goto errout; |
119 | } | |
f4009237 | 120 | |
952313bd JF |
121 | tcf_exts_change(tp, &new->exts, &e); |
122 | tcf_em_tree_change(tp, &new->ematches, &t); | |
f4009237 | 123 | |
952313bd JF |
124 | rcu_assign_pointer(tp->root, new); |
125 | if (head) | |
126 | call_rcu(&head->rcu, cls_cgroup_destroy_rcu); | |
f4009237 | 127 | return 0; |
d14cbfc8 | 128 | errout: |
b9a24bb7 | 129 | tcf_exts_destroy(&new->exts); |
d14cbfc8 JF |
130 | kfree(new); |
131 | return err; | |
f4009237 TG |
132 | } |
133 | ||
1e052be6 | 134 | static bool cls_cgroup_destroy(struct tcf_proto *tp, bool force) |
f4009237 | 135 | { |
952313bd | 136 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 | 137 | |
1e052be6 CW |
138 | if (!force) |
139 | return false; | |
d9363774 DB |
140 | /* Head can still be NULL due to cls_cgroup_init(). */ |
141 | if (head) | |
13990f81 | 142 | call_rcu(&head->rcu, cls_cgroup_destroy_rcu); |
d9363774 | 143 | |
1e052be6 | 144 | return true; |
f4009237 TG |
145 | } |
146 | ||
147 | static int cls_cgroup_delete(struct tcf_proto *tp, unsigned long arg) | |
148 | { | |
149 | return -EOPNOTSUPP; | |
150 | } | |
151 | ||
152 | static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
153 | { | |
952313bd | 154 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
155 | |
156 | if (arg->count < arg->skip) | |
157 | goto skip; | |
158 | ||
159 | if (arg->fn(tp, (unsigned long) head, arg) < 0) { | |
160 | arg->stop = 1; | |
161 | return; | |
162 | } | |
163 | skip: | |
164 | arg->count++; | |
165 | } | |
166 | ||
832d1d5b | 167 | static int cls_cgroup_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
f4009237 TG |
168 | struct sk_buff *skb, struct tcmsg *t) |
169 | { | |
952313bd | 170 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
171 | struct nlattr *nest; |
172 | ||
173 | t->tcm_handle = head->handle; | |
174 | ||
175 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
176 | if (nest == NULL) | |
177 | goto nla_put_failure; | |
178 | ||
5da57f42 | 179 | if (tcf_exts_dump(skb, &head->exts) < 0 || |
f4009237 TG |
180 | tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0) |
181 | goto nla_put_failure; | |
182 | ||
183 | nla_nest_end(skb, nest); | |
184 | ||
5da57f42 | 185 | if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
f4009237 TG |
186 | goto nla_put_failure; |
187 | ||
188 | return skb->len; | |
189 | ||
190 | nla_put_failure: | |
6ea3b446 | 191 | nla_nest_cancel(skb, nest); |
f4009237 TG |
192 | return -1; |
193 | } | |
194 | ||
195 | static struct tcf_proto_ops cls_cgroup_ops __read_mostly = { | |
196 | .kind = "cgroup", | |
197 | .init = cls_cgroup_init, | |
198 | .change = cls_cgroup_change, | |
199 | .classify = cls_cgroup_classify, | |
200 | .destroy = cls_cgroup_destroy, | |
201 | .get = cls_cgroup_get, | |
f4009237 TG |
202 | .delete = cls_cgroup_delete, |
203 | .walk = cls_cgroup_walk, | |
204 | .dump = cls_cgroup_dump, | |
205 | .owner = THIS_MODULE, | |
206 | }; | |
207 | ||
208 | static int __init init_cgroup_cls(void) | |
209 | { | |
fe1217c4 | 210 | return register_tcf_proto_ops(&cls_cgroup_ops); |
f4009237 TG |
211 | } |
212 | ||
213 | static void __exit exit_cgroup_cls(void) | |
214 | { | |
215 | unregister_tcf_proto_ops(&cls_cgroup_ops); | |
216 | } | |
217 | ||
218 | module_init(init_cgroup_cls); | |
219 | module_exit(exit_cgroup_cls); | |
220 | MODULE_LICENSE("GPL"); |