Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f4009237 TG |
2 | /* |
3 | * net/sched/cls_cgroup.c Control Group Classifier | |
4 | * | |
f4009237 TG |
5 | * Authors: Thomas Graf <tgraf@suug.ch> |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
f4009237 | 10 | #include <linux/skbuff.h> |
f8451725 | 11 | #include <linux/rcupdate.h> |
f4009237 TG |
12 | #include <net/rtnetlink.h> |
13 | #include <net/pkt_cls.h> | |
f8451725 HX |
14 | #include <net/sock.h> |
15 | #include <net/cls_cgroup.h> | |
9f3101dc | 16 | #include <net/tc_wrapper.h> |
f4009237 | 17 | |
cc7ec456 | 18 | struct cls_cgroup_head { |
f4009237 TG |
19 | u32 handle; |
20 | struct tcf_exts exts; | |
21 | struct tcf_ematch_tree ematches; | |
952313bd | 22 | struct tcf_proto *tp; |
aaa908ff | 23 | struct rcu_work rwork; |
f4009237 TG |
24 | }; |
25 | ||
9f3101dc PT |
26 | TC_INDIRECT_SCOPE int cls_cgroup_classify(struct sk_buff *skb, |
27 | const struct tcf_proto *tp, | |
28 | struct tcf_result *res) | |
f4009237 | 29 | { |
952313bd | 30 | struct cls_cgroup_head *head = rcu_dereference_bh(tp->root); |
b87a173e | 31 | u32 classid = task_get_classid(skb); |
f4009237 | 32 | |
594725db MC |
33 | if (unlikely(!head)) |
34 | return -1; | |
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, |
695176bf | 81 | void **arg, u32 flags, |
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; |
8cb08174 JB |
107 | err = nla_parse_nested_deprecated(tb, TCA_CGROUP_MAX, |
108 | tca[TCA_OPTIONS], cgroup_policy, | |
109 | NULL); | |
f4009237 | 110 | if (err < 0) |
d14cbfc8 | 111 | goto errout; |
f4009237 | 112 | |
695176bf CW |
113 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, flags, |
114 | extack); | |
f4009237 | 115 | if (err < 0) |
d14cbfc8 | 116 | goto errout; |
f4009237 | 117 | |
4ebc1e3c | 118 | err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches); |
8cc62513 | 119 | if (err < 0) |
d14cbfc8 | 120 | goto errout; |
f4009237 | 121 | |
952313bd | 122 | rcu_assign_pointer(tp->root, new); |
ed148168 CW |
123 | if (head) { |
124 | tcf_exts_get_net(&head->exts); | |
aaa908ff | 125 | tcf_queue_work(&head->rwork, cls_cgroup_destroy_work); |
ed148168 | 126 | } |
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 | ||
12db03b6 | 134 | static void cls_cgroup_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 135 | struct netlink_ext_ack *extack) |
f4009237 | 136 | { |
952313bd | 137 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 | 138 | |
d9363774 | 139 | /* Head can still be NULL due to cls_cgroup_init(). */ |
ed148168 CW |
140 | if (head) { |
141 | if (tcf_exts_get_net(&head->exts)) | |
aaa908ff | 142 | tcf_queue_work(&head->rwork, cls_cgroup_destroy_work); |
ed148168 CW |
143 | else |
144 | __cls_cgroup_destroy(head); | |
145 | } | |
f4009237 TG |
146 | } |
147 | ||
571acf21 | 148 | static int cls_cgroup_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 149 | bool rtnl_held, struct netlink_ext_ack *extack) |
f4009237 TG |
150 | { |
151 | return -EOPNOTSUPP; | |
152 | } | |
153 | ||
12db03b6 VB |
154 | static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg, |
155 | bool rtnl_held) | |
f4009237 | 156 | { |
952313bd | 157 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
158 | |
159 | if (arg->count < arg->skip) | |
160 | goto skip; | |
161 | ||
8b58d12f VB |
162 | if (!head) |
163 | return; | |
8113c095 | 164 | if (arg->fn(tp, head, arg) < 0) { |
f4009237 TG |
165 | arg->stop = 1; |
166 | return; | |
167 | } | |
168 | skip: | |
169 | arg->count++; | |
170 | } | |
171 | ||
8113c095 | 172 | static int cls_cgroup_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 173 | struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
f4009237 | 174 | { |
952313bd | 175 | struct cls_cgroup_head *head = rtnl_dereference(tp->root); |
f4009237 TG |
176 | struct nlattr *nest; |
177 | ||
178 | t->tcm_handle = head->handle; | |
179 | ||
ae0be8de | 180 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
f4009237 TG |
181 | if (nest == NULL) |
182 | goto nla_put_failure; | |
183 | ||
5da57f42 | 184 | if (tcf_exts_dump(skb, &head->exts) < 0 || |
f4009237 TG |
185 | tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0) |
186 | goto nla_put_failure; | |
187 | ||
188 | nla_nest_end(skb, nest); | |
189 | ||
5da57f42 | 190 | if (tcf_exts_dump_stats(skb, &head->exts) < 0) |
f4009237 TG |
191 | goto nla_put_failure; |
192 | ||
193 | return skb->len; | |
194 | ||
195 | nla_put_failure: | |
6ea3b446 | 196 | nla_nest_cancel(skb, nest); |
f4009237 TG |
197 | return -1; |
198 | } | |
199 | ||
200 | static struct tcf_proto_ops cls_cgroup_ops __read_mostly = { | |
201 | .kind = "cgroup", | |
202 | .init = cls_cgroup_init, | |
203 | .change = cls_cgroup_change, | |
204 | .classify = cls_cgroup_classify, | |
205 | .destroy = cls_cgroup_destroy, | |
206 | .get = cls_cgroup_get, | |
f4009237 TG |
207 | .delete = cls_cgroup_delete, |
208 | .walk = cls_cgroup_walk, | |
209 | .dump = cls_cgroup_dump, | |
210 | .owner = THIS_MODULE, | |
211 | }; | |
212 | ||
213 | static int __init init_cgroup_cls(void) | |
214 | { | |
fe1217c4 | 215 | return register_tcf_proto_ops(&cls_cgroup_ops); |
f4009237 TG |
216 | } |
217 | ||
218 | static void __exit exit_cgroup_cls(void) | |
219 | { | |
220 | unregister_tcf_proto_ops(&cls_cgroup_ops); | |
221 | } | |
222 | ||
223 | module_init(init_cgroup_cls); | |
224 | module_exit(exit_cgroup_cls); | |
225 | MODULE_LICENSE("GPL"); |