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Linux/net/sched/cls_basic.c

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  1 /*
  2  * net/sched/cls_basic.c        Basic Packet 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>
 13 #include <linux/slab.h>
 14 #include <linux/types.h>
 15 #include <linux/kernel.h>
 16 #include <linux/string.h>
 17 #include <linux/errno.h>
 18 #include <linux/rtnetlink.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/idr.h>
 21 #include <net/netlink.h>
 22 #include <net/act_api.h>
 23 #include <net/pkt_cls.h>
 24 
 25 struct basic_head {
 26         struct list_head        flist;
 27         struct idr              handle_idr;
 28         struct rcu_head         rcu;
 29 };
 30 
 31 struct basic_filter {
 32         u32                     handle;
 33         struct tcf_exts         exts;
 34         struct tcf_ematch_tree  ematches;
 35         struct tcf_result       res;
 36         struct tcf_proto        *tp;
 37         struct list_head        link;
 38         struct rcu_work         rwork;
 39 };
 40 
 41 static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 42                           struct tcf_result *res)
 43 {
 44         int r;
 45         struct basic_head *head = rcu_dereference_bh(tp->root);
 46         struct basic_filter *f;
 47 
 48         list_for_each_entry_rcu(f, &head->flist, link) {
 49                 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
 50                         continue;
 51                 *res = f->res;
 52                 r = tcf_exts_exec(skb, &f->exts, res);
 53                 if (r < 0)
 54                         continue;
 55                 return r;
 56         }
 57         return -1;
 58 }
 59 
 60 static void *basic_get(struct tcf_proto *tp, u32 handle)
 61 {
 62         struct basic_head *head = rtnl_dereference(tp->root);
 63         struct basic_filter *f;
 64 
 65         list_for_each_entry(f, &head->flist, link) {
 66                 if (f->handle == handle) {
 67                         return f;
 68                 }
 69         }
 70 
 71         return NULL;
 72 }
 73 
 74 static int basic_init(struct tcf_proto *tp)
 75 {
 76         struct basic_head *head;
 77 
 78         head = kzalloc(sizeof(*head), GFP_KERNEL);
 79         if (head == NULL)
 80                 return -ENOBUFS;
 81         INIT_LIST_HEAD(&head->flist);
 82         idr_init(&head->handle_idr);
 83         rcu_assign_pointer(tp->root, head);
 84         return 0;
 85 }
 86 
 87 static void __basic_delete_filter(struct basic_filter *f)
 88 {
 89         tcf_exts_destroy(&f->exts);
 90         tcf_em_tree_destroy(&f->ematches);
 91         tcf_exts_put_net(&f->exts);
 92         kfree(f);
 93 }
 94 
 95 static void basic_delete_filter_work(struct work_struct *work)
 96 {
 97         struct basic_filter *f = container_of(to_rcu_work(work),
 98                                               struct basic_filter,
 99                                               rwork);
100         rtnl_lock();
101         __basic_delete_filter(f);
102         rtnl_unlock();
103 }
104 
105 static void basic_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
106 {
107         struct basic_head *head = rtnl_dereference(tp->root);
108         struct basic_filter *f, *n;
109 
110         list_for_each_entry_safe(f, n, &head->flist, link) {
111                 list_del_rcu(&f->link);
112                 tcf_unbind_filter(tp, &f->res);
113                 idr_remove(&head->handle_idr, f->handle);
114                 if (tcf_exts_get_net(&f->exts))
115                         tcf_queue_work(&f->rwork, basic_delete_filter_work);
116                 else
117                         __basic_delete_filter(f);
118         }
119         idr_destroy(&head->handle_idr);
120         kfree_rcu(head, rcu);
121 }
122 
123 static int basic_delete(struct tcf_proto *tp, void *arg, bool *last,
124                         struct netlink_ext_ack *extack)
125 {
126         struct basic_head *head = rtnl_dereference(tp->root);
127         struct basic_filter *f = arg;
128 
129         list_del_rcu(&f->link);
130         tcf_unbind_filter(tp, &f->res);
131         idr_remove(&head->handle_idr, f->handle);
132         tcf_exts_get_net(&f->exts);
133         tcf_queue_work(&f->rwork, basic_delete_filter_work);
134         *last = list_empty(&head->flist);
135         return 0;
136 }
137 
138 static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
139         [TCA_BASIC_CLASSID]     = { .type = NLA_U32 },
140         [TCA_BASIC_EMATCHES]    = { .type = NLA_NESTED },
141 };
142 
143 static int basic_set_parms(struct net *net, struct tcf_proto *tp,
144                            struct basic_filter *f, unsigned long base,
145                            struct nlattr **tb,
146                            struct nlattr *est, bool ovr,
147                            struct netlink_ext_ack *extack)
148 {
149         int err;
150 
151         err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
152         if (err < 0)
153                 return err;
154 
155         err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches);
156         if (err < 0)
157                 return err;
158 
159         if (tb[TCA_BASIC_CLASSID]) {
160                 f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
161                 tcf_bind_filter(tp, &f->res, base);
162         }
163 
164         f->tp = tp;
165         return 0;
166 }
167 
168 static int basic_change(struct net *net, struct sk_buff *in_skb,
169                         struct tcf_proto *tp, unsigned long base, u32 handle,
170                         struct nlattr **tca, void **arg, bool ovr,
171                         struct netlink_ext_ack *extack)
172 {
173         int err;
174         struct basic_head *head = rtnl_dereference(tp->root);
175         struct nlattr *tb[TCA_BASIC_MAX + 1];
176         struct basic_filter *fold = (struct basic_filter *) *arg;
177         struct basic_filter *fnew;
178 
179         if (tca[TCA_OPTIONS] == NULL)
180                 return -EINVAL;
181 
182         err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
183                                basic_policy, NULL);
184         if (err < 0)
185                 return err;
186 
187         if (fold != NULL) {
188                 if (handle && fold->handle != handle)
189                         return -EINVAL;
190         }
191 
192         fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
193         if (!fnew)
194                 return -ENOBUFS;
195 
196         err = tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE);
197         if (err < 0)
198                 goto errout;
199 
200         if (!handle) {
201                 handle = 1;
202                 err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
203                                     INT_MAX, GFP_KERNEL);
204         } else if (!fold) {
205                 err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
206                                     handle, GFP_KERNEL);
207         }
208         if (err)
209                 goto errout;
210         fnew->handle = handle;
211 
212         err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr,
213                               extack);
214         if (err < 0) {
215                 if (!fold)
216                         idr_remove(&head->handle_idr, fnew->handle);
217                 goto errout;
218         }
219 
220         *arg = fnew;
221 
222         if (fold) {
223                 idr_replace(&head->handle_idr, fnew, fnew->handle);
224                 list_replace_rcu(&fold->link, &fnew->link);
225                 tcf_unbind_filter(tp, &fold->res);
226                 tcf_exts_get_net(&fold->exts);
227                 tcf_queue_work(&fold->rwork, basic_delete_filter_work);
228         } else {
229                 list_add_rcu(&fnew->link, &head->flist);
230         }
231 
232         return 0;
233 errout:
234         tcf_exts_destroy(&fnew->exts);
235         kfree(fnew);
236         return err;
237 }
238 
239 static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
240 {
241         struct basic_head *head = rtnl_dereference(tp->root);
242         struct basic_filter *f;
243 
244         list_for_each_entry(f, &head->flist, link) {
245                 if (arg->count < arg->skip)
246                         goto skip;
247 
248                 if (arg->fn(tp, f, arg) < 0) {
249                         arg->stop = 1;
250                         break;
251                 }
252 skip:
253                 arg->count++;
254         }
255 }
256 
257 static void basic_bind_class(void *fh, u32 classid, unsigned long cl)
258 {
259         struct basic_filter *f = fh;
260 
261         if (f && f->res.classid == classid)
262                 f->res.class = cl;
263 }
264 
265 static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh,
266                       struct sk_buff *skb, struct tcmsg *t)
267 {
268         struct basic_filter *f = fh;
269         struct nlattr *nest;
270 
271         if (f == NULL)
272                 return skb->len;
273 
274         t->tcm_handle = f->handle;
275 
276         nest = nla_nest_start(skb, TCA_OPTIONS);
277         if (nest == NULL)
278                 goto nla_put_failure;
279 
280         if (f->res.classid &&
281             nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid))
282                 goto nla_put_failure;
283 
284         if (tcf_exts_dump(skb, &f->exts) < 0 ||
285             tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
286                 goto nla_put_failure;
287 
288         nla_nest_end(skb, nest);
289 
290         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
291                 goto nla_put_failure;
292 
293         return skb->len;
294 
295 nla_put_failure:
296         nla_nest_cancel(skb, nest);
297         return -1;
298 }
299 
300 static struct tcf_proto_ops cls_basic_ops __read_mostly = {
301         .kind           =       "basic",
302         .classify       =       basic_classify,
303         .init           =       basic_init,
304         .destroy        =       basic_destroy,
305         .get            =       basic_get,
306         .change         =       basic_change,
307         .delete         =       basic_delete,
308         .walk           =       basic_walk,
309         .dump           =       basic_dump,
310         .bind_class     =       basic_bind_class,
311         .owner          =       THIS_MODULE,
312 };
313 
314 static int __init init_basic(void)
315 {
316         return register_tcf_proto_ops(&cls_basic_ops);
317 }
318 
319 static void __exit exit_basic(void)
320 {
321         unregister_tcf_proto_ops(&cls_basic_ops);
322 }
323 
324 module_init(init_basic)
325 module_exit(exit_basic)
326 MODULE_LICENSE("GPL");
327 

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