2 * net/sched/cls_cgroup.c Control Group Classifier
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.
9 * Authors: Thomas Graf <tgraf@suug.ch>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/skbuff.h>
15 #include <linux/rcupdate.h>
16 #include <net/rtnetlink.h>
17 #include <net/pkt_cls.h>
19 #include <net/cls_cgroup.h>
21 struct cls_cgroup_head {
24 struct tcf_ematch_tree ematches;
29 static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
30 struct tcf_result *res)
32 struct cls_cgroup_head *head = rcu_dereference_bh(tp->root);
33 u32 classid = task_get_classid(skb);
37 if (!tcf_em_tree_match(skb, &head->ematches, NULL))
40 res->classid = classid;
43 return tcf_exts_exec(skb, &head->exts, res);
46 static void *cls_cgroup_get(struct tcf_proto *tp, u32 handle)
51 static int cls_cgroup_init(struct tcf_proto *tp)
56 static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = {
57 [TCA_CGROUP_EMATCHES] = { .type = NLA_NESTED },
60 static void cls_cgroup_destroy_rcu(struct rcu_head *root)
62 struct cls_cgroup_head *head = container_of(root,
63 struct cls_cgroup_head,
66 tcf_exts_destroy(&head->exts);
67 tcf_em_tree_destroy(&head->ematches);
71 static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
72 struct tcf_proto *tp, unsigned long base,
73 u32 handle, struct nlattr **tca,
76 struct nlattr *tb[TCA_CGROUP_MAX + 1];
77 struct cls_cgroup_head *head = rtnl_dereference(tp->root);
78 struct cls_cgroup_head *new;
81 if (!tca[TCA_OPTIONS])
87 if (head && handle != head->handle)
90 new = kzalloc(sizeof(*head), GFP_KERNEL);
94 err = tcf_exts_init(&new->exts, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
99 err = nla_parse_nested(tb, TCA_CGROUP_MAX, tca[TCA_OPTIONS],
100 cgroup_policy, NULL);
104 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, ovr);
108 err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches);
112 rcu_assign_pointer(tp->root, new);
114 call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
117 tcf_exts_destroy(&new->exts);
122 static void cls_cgroup_destroy(struct tcf_proto *tp)
124 struct cls_cgroup_head *head = rtnl_dereference(tp->root);
126 /* Head can still be NULL due to cls_cgroup_init(). */
128 call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
131 static int cls_cgroup_delete(struct tcf_proto *tp, void *arg, bool *last)
136 static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg)
138 struct cls_cgroup_head *head = rtnl_dereference(tp->root);
140 if (arg->count < arg->skip)
143 if (arg->fn(tp, head, arg) < 0) {
151 static int cls_cgroup_dump(struct net *net, struct tcf_proto *tp, void *fh,
152 struct sk_buff *skb, struct tcmsg *t)
154 struct cls_cgroup_head *head = rtnl_dereference(tp->root);
157 t->tcm_handle = head->handle;
159 nest = nla_nest_start(skb, TCA_OPTIONS);
161 goto nla_put_failure;
163 if (tcf_exts_dump(skb, &head->exts) < 0 ||
164 tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0)
165 goto nla_put_failure;
167 nla_nest_end(skb, nest);
169 if (tcf_exts_dump_stats(skb, &head->exts) < 0)
170 goto nla_put_failure;
175 nla_nest_cancel(skb, nest);
179 static struct tcf_proto_ops cls_cgroup_ops __read_mostly = {
181 .init = cls_cgroup_init,
182 .change = cls_cgroup_change,
183 .classify = cls_cgroup_classify,
184 .destroy = cls_cgroup_destroy,
185 .get = cls_cgroup_get,
186 .delete = cls_cgroup_delete,
187 .walk = cls_cgroup_walk,
188 .dump = cls_cgroup_dump,
189 .owner = THIS_MODULE,
192 static int __init init_cgroup_cls(void)
194 return register_tcf_proto_ops(&cls_cgroup_ops);
197 static void __exit exit_cgroup_cls(void)
199 unregister_tcf_proto_ops(&cls_cgroup_ops);
202 module_init(init_cgroup_cls);
203 module_exit(exit_cgroup_cls);
204 MODULE_LICENSE("GPL");