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; |
aaa908ff | 26 | struct rcu_work rwork; |
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 | ||
8113c095 | 46 | static void *cls_cgroup_get(struct tcf_proto *tp, u32 handle) |
f4009237 | 47 | { |
8113c095 | 48 | return NULL; |
f4009237 TG |
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 | ||
ed148168 CW |
60 | static void __cls_cgroup_destroy(struct cls_cgroup_head *head) |
61 | { | |
62 | tcf_exts_destroy(&head->exts); | |
63 | tcf_em_tree_destroy(&head->ematches); | |
64 | tcf_exts_put_net(&head->exts); | |
65 | kfree(head); | |
66 | } | |
67 | ||
b1b5b04f CW |
68 | static void cls_cgroup_destroy_work(struct work_struct *work) |
69 | { | |
aaa908ff | 70 | struct cls_cgroup_head *head = container_of(to_rcu_work(work), |
b1b5b04f | 71 | struct cls_cgroup_head, |
aaa908ff | 72 | rwork); |
b1b5b04f | 73 | rtnl_lock(); |
ed148168 | 74 | __cls_cgroup_destroy(head); |
b1b5b04f CW |
75 | rtnl_unlock(); |
76 | } | |
77 | ||
c1b52739 | 78 | static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 79 | struct tcf_proto *tp, unsigned long base, |
f4009237 | 80 | u32 handle, struct nlattr **tca, |
12db03b6 | 81 | void **arg, bool ovr, bool rtnl_held, |
7306db38 | 82 | struct netlink_ext_ack *extack) |
f4009237 | 83 | { |
cc7ec456 | 84 | struct nlattr *tb[TCA_CGROUP_MAX + 1]; |
952313bd JF |
85 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
86 | struct cls_cgroup_head *new; | |
f4009237 TG |
87 | int err; |
88 | ||
52ea3a56 MU |
89 | if (!tca[TCA_OPTIONS]) |
90 | return -EINVAL; | |
91 | ||
952313bd JF |
92 | if (!head && !handle) |
93 | return -EINVAL; | |
f4009237 | 94 | |
952313bd JF |
95 | if (head && handle != head->handle) |
96 | return -ENOENT; | |
f4009237 | 97 | |
952313bd JF |
98 | new = kzalloc(sizeof(*head), GFP_KERNEL); |
99 | if (!new) | |
100 | return -ENOBUFS; | |
f4009237 | 101 | |
14215108 | 102 | err = tcf_exts_init(&new->exts, net, TCA_CGROUP_ACT, TCA_CGROUP_POLICE); |
b9a24bb7 WC |
103 | if (err < 0) |
104 | goto errout; | |
18b5427a | 105 | new->handle = handle; |
952313bd | 106 | new->tp = tp; |
f4009237 | 107 | err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS], |
fceb6435 | 108 | cgroup_policy, NULL); |
f4009237 | 109 | if (err < 0) |
d14cbfc8 | 110 | goto errout; |
f4009237 | 111 | |
50a56190 | 112 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, ovr, |
ec6743a1 | 113 | true, extack); |
f4009237 | 114 | if (err < 0) |
d14cbfc8 | 115 | goto errout; |
f4009237 | 116 | |
4ebc1e3c | 117 | err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches); |
8cc62513 | 118 | if (err < 0) |
d14cbfc8 | 119 | goto errout; |
f4009237 | 120 | |
952313bd | 121 | rcu_assign_pointer(tp->root, new); |
ed148168 CW |
122 | if (head) { |
123 | tcf_exts_get_net(&head->exts); | |
aaa908ff | 124 | tcf_queue_work(&head->rwork, cls_cgroup_destroy_work); |
ed148168 | 125 | } |
f4009237 | 126 | return 0; |
d14cbfc8 | 127 | errout: |
b9a24bb7 | 128 | tcf_exts_destroy(&new->exts); |
d14cbfc8 JF |
129 | kfree(new); |
130 | return err; | |
f4009237 TG |
131 | } |
132 | ||
12db03b6 | 133 | static void cls_cgroup_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 134 | struct netlink_ext_ack *extack) |
f4009237 | 135 | { |
952313bd | 136 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 | 137 | |
d9363774 | 138 | /* Head can still be NULL due to cls_cgroup_init(). */ |
ed148168 CW |
139 | if (head) { |
140 | if (tcf_exts_get_net(&head->exts)) | |
aaa908ff | 141 | tcf_queue_work(&head->rwork, cls_cgroup_destroy_work); |
ed148168 CW |
142 | else |
143 | __cls_cgroup_destroy(head); | |
144 | } | |
f4009237 TG |
145 | } |
146 | ||
571acf21 | 147 | static int cls_cgroup_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 148 | bool rtnl_held, struct netlink_ext_ack *extack) |
f4009237 TG |
149 | { |
150 | return -EOPNOTSUPP; | |
151 | } | |
152 | ||
12db03b6 VB |
153 | static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
154 | bool rtnl_held) | |
f4009237 | 155 | { |
952313bd | 156 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
157 | |
158 | if (arg->count < arg->skip) | |
159 | goto skip; | |
160 | ||
8b58d12f VB |
161 | if (!head) |
162 | return; | |
8113c095 | 163 | if (arg->fn(tp, head, arg) < 0) { |
f4009237 TG |
164 | arg->stop = 1; |
165 | return; | |
166 | } | |
167 | skip: | |
168 | arg->count++; | |
169 | } | |
170 | ||
8113c095 | 171 | static int cls_cgroup_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 172 | struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
f4009237 | 173 | { |
952313bd | 174 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
175 | struct nlattr *nest; |
176 | ||
177 | t->tcm_handle = head->handle; | |
178 | ||
179 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
180 | if (nest == NULL) | |
181 | goto nla_put_failure; | |
182 | ||
5da57f42 | 183 | if (tcf_exts_dump(skb, &head->exts) < 0 || |
f4009237 TG |
184 | tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0) |
185 | goto nla_put_failure; | |
186 | ||
187 | nla_nest_end(skb, nest); | |
188 | ||
5da57f42 | 189 | if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
f4009237 TG |
190 | goto nla_put_failure; |
191 | ||
192 | return skb->len; | |
193 | ||
194 | nla_put_failure: | |
6ea3b446 | 195 | nla_nest_cancel(skb, nest); |
f4009237 TG |
196 | return -1; |
197 | } | |
198 | ||
199 | static struct tcf_proto_ops cls_cgroup_ops __read_mostly = { | |
200 | .kind = "cgroup", | |
201 | .init = cls_cgroup_init, | |
202 | .change = cls_cgroup_change, | |
203 | .classify = cls_cgroup_classify, | |
204 | .destroy = cls_cgroup_destroy, | |
205 | .get = cls_cgroup_get, | |
f4009237 TG |
206 | .delete = cls_cgroup_delete, |
207 | .walk = cls_cgroup_walk, | |
208 | .dump = cls_cgroup_dump, | |
209 | .owner = THIS_MODULE, | |
210 | }; | |
211 | ||
212 | static int __init init_cgroup_cls(void) | |
213 | { | |
fe1217c4 | 214 | return register_tcf_proto_ops(&cls_cgroup_ops); |
f4009237 TG |
215 | } |
216 | ||
217 | static void __exit exit_cgroup_cls(void) | |
218 | { | |
219 | unregister_tcf_proto_ops(&cls_cgroup_ops); | |
220 | } | |
221 | ||
222 | module_init(init_cgroup_cls); | |
223 | module_exit(exit_cgroup_cls); | |
224 | MODULE_LICENSE("GPL"); |