2 * net/sched/cls_basic.c Basic Packet 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/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>
26 struct list_head flist;
27 struct idr handle_idr;
34 struct tcf_ematch_tree ematches;
35 struct tcf_result res;
37 struct list_head link;
39 struct work_struct work;
44 static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp,
45 struct tcf_result *res)
48 struct basic_head *head = rcu_dereference_bh(tp->root);
49 struct basic_filter *f;
51 list_for_each_entry_rcu(f, &head->flist, link) {
52 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
55 r = tcf_exts_exec(skb, &f->exts, res);
63 static void *basic_get(struct tcf_proto *tp, u32 handle)
65 struct basic_head *head = rtnl_dereference(tp->root);
66 struct basic_filter *f;
68 list_for_each_entry(f, &head->flist, link) {
69 if (f->handle == handle) {
77 static int basic_init(struct tcf_proto *tp)
79 struct basic_head *head;
81 head = kzalloc(sizeof(*head), GFP_KERNEL);
84 INIT_LIST_HEAD(&head->flist);
85 idr_init(&head->handle_idr);
86 rcu_assign_pointer(tp->root, head);
90 static void __basic_delete_filter(struct basic_filter *f)
92 tcf_exts_destroy(&f->exts);
93 tcf_em_tree_destroy(&f->ematches);
94 tcf_exts_put_net(&f->exts);
98 static void basic_delete_filter_work(struct work_struct *work)
100 struct basic_filter *f = container_of(work, struct basic_filter, work);
103 __basic_delete_filter(f);
107 static void basic_delete_filter(struct rcu_head *head)
109 struct basic_filter *f = container_of(head, struct basic_filter, rcu);
111 INIT_WORK(&f->work, basic_delete_filter_work);
112 tcf_queue_work(&f->work);
115 static void basic_destroy(struct tcf_proto *tp)
117 struct basic_head *head = rtnl_dereference(tp->root);
118 struct basic_filter *f, *n;
120 list_for_each_entry_safe(f, n, &head->flist, link) {
121 list_del_rcu(&f->link);
122 tcf_unbind_filter(tp, &f->res);
123 idr_remove_ext(&head->handle_idr, f->handle);
124 if (tcf_exts_get_net(&f->exts))
125 call_rcu(&f->rcu, basic_delete_filter);
127 __basic_delete_filter(f);
129 idr_destroy(&head->handle_idr);
130 kfree_rcu(head, rcu);
133 static int basic_delete(struct tcf_proto *tp, void *arg, bool *last)
135 struct basic_head *head = rtnl_dereference(tp->root);
136 struct basic_filter *f = arg;
138 list_del_rcu(&f->link);
139 tcf_unbind_filter(tp, &f->res);
140 idr_remove_ext(&head->handle_idr, f->handle);
141 tcf_exts_get_net(&f->exts);
142 call_rcu(&f->rcu, basic_delete_filter);
143 *last = list_empty(&head->flist);
147 static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
148 [TCA_BASIC_CLASSID] = { .type = NLA_U32 },
149 [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED },
152 static int basic_set_parms(struct net *net, struct tcf_proto *tp,
153 struct basic_filter *f, unsigned long base,
155 struct nlattr *est, bool ovr)
159 err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
163 err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches);
167 if (tb[TCA_BASIC_CLASSID]) {
168 f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]);
169 tcf_bind_filter(tp, &f->res, base);
176 static int basic_change(struct net *net, struct sk_buff *in_skb,
177 struct tcf_proto *tp, unsigned long base, u32 handle,
178 struct nlattr **tca, void **arg, bool ovr)
181 struct basic_head *head = rtnl_dereference(tp->root);
182 struct nlattr *tb[TCA_BASIC_MAX + 1];
183 struct basic_filter *fold = (struct basic_filter *) *arg;
184 struct basic_filter *fnew;
185 unsigned long idr_index;
187 if (tca[TCA_OPTIONS] == NULL)
190 err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS],
196 if (handle && fold->handle != handle)
200 fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
204 err = tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE);
209 fnew->handle = handle;
211 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
212 handle, handle + 1, GFP_KERNEL);
217 err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
218 1, 0x7FFFFFFF, GFP_KERNEL);
221 fnew->handle = idr_index;
224 err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
227 idr_remove_ext(&head->handle_idr, fnew->handle);
234 idr_replace_ext(&head->handle_idr, fnew, fnew->handle);
235 list_replace_rcu(&fold->link, &fnew->link);
236 tcf_unbind_filter(tp, &fold->res);
237 tcf_exts_get_net(&fold->exts);
238 call_rcu(&fold->rcu, basic_delete_filter);
240 list_add_rcu(&fnew->link, &head->flist);
245 tcf_exts_destroy(&fnew->exts);
250 static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
252 struct basic_head *head = rtnl_dereference(tp->root);
253 struct basic_filter *f;
255 list_for_each_entry(f, &head->flist, link) {
256 if (arg->count < arg->skip)
259 if (arg->fn(tp, f, arg) < 0) {
268 static void basic_bind_class(void *fh, u32 classid, unsigned long cl)
270 struct basic_filter *f = fh;
272 if (f && f->res.classid == classid)
276 static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh,
277 struct sk_buff *skb, struct tcmsg *t)
279 struct basic_filter *f = fh;
285 t->tcm_handle = f->handle;
287 nest = nla_nest_start(skb, TCA_OPTIONS);
289 goto nla_put_failure;
291 if (f->res.classid &&
292 nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid))
293 goto nla_put_failure;
295 if (tcf_exts_dump(skb, &f->exts) < 0 ||
296 tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
297 goto nla_put_failure;
299 nla_nest_end(skb, nest);
301 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
302 goto nla_put_failure;
307 nla_nest_cancel(skb, nest);
311 static struct tcf_proto_ops cls_basic_ops __read_mostly = {
313 .classify = basic_classify,
315 .destroy = basic_destroy,
317 .change = basic_change,
318 .delete = basic_delete,
321 .bind_class = basic_bind_class,
322 .owner = THIS_MODULE,
325 static int __init init_basic(void)
327 return register_tcf_proto_ops(&cls_basic_ops);
330 static void __exit exit_basic(void)
332 unregister_tcf_proto_ops(&cls_basic_ops);
335 module_init(init_basic)
336 module_exit(exit_basic)
337 MODULE_LICENSE("GPL");