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Linux/net/sched/cls_cgroup.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * net/sched/cls_cgroup.c       Control Group Classifier
  4  *
  5  * Authors:     Thomas Graf <tgraf@suug.ch>
  6  */
  7 
  8 #include <linux/module.h>
  9 #include <linux/slab.h>
 10 #include <linux/skbuff.h>
 11 #include <linux/rcupdate.h>
 12 #include <net/rtnetlink.h>
 13 #include <net/pkt_cls.h>
 14 #include <net/sock.h>
 15 #include <net/cls_cgroup.h>
 16 
 17 struct cls_cgroup_head {
 18         u32                     handle;
 19         struct tcf_exts         exts;
 20         struct tcf_ematch_tree  ematches;
 21         struct tcf_proto        *tp;
 22         struct rcu_work         rwork;
 23 };
 24 
 25 static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 26                                struct tcf_result *res)
 27 {
 28         struct cls_cgroup_head *head = rcu_dereference_bh(tp->root);
 29         u32 classid = task_get_classid(skb);
 30 
 31         if (unlikely(!head))
 32                 return -1;
 33         if (!classid)
 34                 return -1;
 35         if (!tcf_em_tree_match(skb, &head->ematches, NULL))
 36                 return -1;
 37 
 38         res->classid = classid;
 39         res->class = 0;
 40 
 41         return tcf_exts_exec(skb, &head->exts, res);
 42 }
 43 
 44 static void *cls_cgroup_get(struct tcf_proto *tp, u32 handle)
 45 {
 46         return NULL;
 47 }
 48 
 49 static int cls_cgroup_init(struct tcf_proto *tp)
 50 {
 51         return 0;
 52 }
 53 
 54 static const struct nla_policy cgroup_policy[TCA_CGROUP_MAX + 1] = {
 55         [TCA_CGROUP_EMATCHES]   = { .type = NLA_NESTED },
 56 };
 57 
 58 static void __cls_cgroup_destroy(struct cls_cgroup_head *head)
 59 {
 60         tcf_exts_destroy(&head->exts);
 61         tcf_em_tree_destroy(&head->ematches);
 62         tcf_exts_put_net(&head->exts);
 63         kfree(head);
 64 }
 65 
 66 static void cls_cgroup_destroy_work(struct work_struct *work)
 67 {
 68         struct cls_cgroup_head *head = container_of(to_rcu_work(work),
 69                                                     struct cls_cgroup_head,
 70                                                     rwork);
 71         rtnl_lock();
 72         __cls_cgroup_destroy(head);
 73         rtnl_unlock();
 74 }
 75 
 76 static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
 77                              struct tcf_proto *tp, unsigned long base,
 78                              u32 handle, struct nlattr **tca,
 79                              void **arg, bool ovr, bool rtnl_held,
 80                              struct netlink_ext_ack *extack)
 81 {
 82         struct nlattr *tb[TCA_CGROUP_MAX + 1];
 83         struct cls_cgroup_head *head = rtnl_dereference(tp->root);
 84         struct cls_cgroup_head *new;
 85         int err;
 86 
 87         if (!tca[TCA_OPTIONS])
 88                 return -EINVAL;
 89 
 90         if (!head && !handle)
 91                 return -EINVAL;
 92 
 93         if (head && handle != head->handle)
 94                 return -ENOENT;
 95 
 96         new = kzalloc(sizeof(*head), GFP_KERNEL);
 97         if (!new)
 98                 return -ENOBUFS;
 99 
100         err = tcf_exts_init(&new->exts, net, TCA_CGROUP_ACT, TCA_CGROUP_POLICE);
101         if (err < 0)
102                 goto errout;
103         new->handle = handle;
104         new->tp = tp;
105         err = nla_parse_nested_deprecated(tb, TCA_CGROUP_MAX,
106                                           tca[TCA_OPTIONS], cgroup_policy,
107                                           NULL);
108         if (err < 0)
109                 goto errout;
110 
111         err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, ovr,
112                                 true, extack);
113         if (err < 0)
114                 goto errout;
115 
116         err = tcf_em_tree_validate(tp, tb[TCA_CGROUP_EMATCHES], &new->ematches);
117         if (err < 0)
118                 goto errout;
119 
120         rcu_assign_pointer(tp->root, new);
121         if (head) {
122                 tcf_exts_get_net(&head->exts);
123                 tcf_queue_work(&head->rwork, cls_cgroup_destroy_work);
124         }
125         return 0;
126 errout:
127         tcf_exts_destroy(&new->exts);
128         kfree(new);
129         return err;
130 }
131 
132 static void cls_cgroup_destroy(struct tcf_proto *tp, bool rtnl_held,
133                                struct netlink_ext_ack *extack)
134 {
135         struct cls_cgroup_head *head = rtnl_dereference(tp->root);
136 
137         /* Head can still be NULL due to cls_cgroup_init(). */
138         if (head) {
139                 if (tcf_exts_get_net(&head->exts))
140                         tcf_queue_work(&head->rwork, cls_cgroup_destroy_work);
141                 else
142                         __cls_cgroup_destroy(head);
143         }
144 }
145 
146 static int cls_cgroup_delete(struct tcf_proto *tp, void *arg, bool *last,
147                              bool rtnl_held, struct netlink_ext_ack *extack)
148 {
149         return -EOPNOTSUPP;
150 }
151 
152 static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg,
153                             bool rtnl_held)
154 {
155         struct cls_cgroup_head *head = rtnl_dereference(tp->root);
156 
157         if (arg->count < arg->skip)
158                 goto skip;
159 
160         if (!head)
161                 return;
162         if (arg->fn(tp, head, arg) < 0) {
163                 arg->stop = 1;
164                 return;
165         }
166 skip:
167         arg->count++;
168 }
169 
170 static int cls_cgroup_dump(struct net *net, struct tcf_proto *tp, void *fh,
171                            struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
172 {
173         struct cls_cgroup_head *head = rtnl_dereference(tp->root);
174         struct nlattr *nest;
175 
176         t->tcm_handle = head->handle;
177 
178         nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
179         if (nest == NULL)
180                 goto nla_put_failure;
181 
182         if (tcf_exts_dump(skb, &head->exts) < 0 ||
183             tcf_em_tree_dump(skb, &head->ematches, TCA_CGROUP_EMATCHES) < 0)
184                 goto nla_put_failure;
185 
186         nla_nest_end(skb, nest);
187 
188         if (tcf_exts_dump_stats(skb, &head->exts) < 0)
189                 goto nla_put_failure;
190 
191         return skb->len;
192 
193 nla_put_failure:
194         nla_nest_cancel(skb, nest);
195         return -1;
196 }
197 
198 static struct tcf_proto_ops cls_cgroup_ops __read_mostly = {
199         .kind           =       "cgroup",
200         .init           =       cls_cgroup_init,
201         .change         =       cls_cgroup_change,
202         .classify       =       cls_cgroup_classify,
203         .destroy        =       cls_cgroup_destroy,
204         .get            =       cls_cgroup_get,
205         .delete         =       cls_cgroup_delete,
206         .walk           =       cls_cgroup_walk,
207         .dump           =       cls_cgroup_dump,
208         .owner          =       THIS_MODULE,
209 };
210 
211 static int __init init_cgroup_cls(void)
212 {
213         return register_tcf_proto_ops(&cls_cgroup_ops);
214 }
215 
216 static void __exit exit_cgroup_cls(void)
217 {
218         unregister_tcf_proto_ops(&cls_cgroup_ops);
219 }
220 
221 module_init(init_cgroup_cls);
222 module_exit(exit_cgroup_cls);
223 MODULE_LICENSE("GPL");
224 

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