blob: c885412d79d5d7613145015e26d05fdd4df55e94 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/string.h>
16#include <linux/mm.h>
17#include <linux/errno.h>
18#include <linux/rtnetlink.h>
19#include <linux/skbuff.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070020#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <net/act_api.h>
22#include <net/pkt_cls.h>
23
24struct basic_head
25{
26 u32 hgenerator;
27 struct list_head flist;
28};
29
30struct basic_filter
31{
32 u32 handle;
33 struct tcf_exts exts;
34 struct tcf_ematch_tree ematches;
35 struct tcf_result res;
36 struct list_head link;
37};
38
39static struct tcf_ext_map basic_ext_map = {
40 .action = TCA_BASIC_ACT,
41 .police = TCA_BASIC_POLICE
42};
43
44static int basic_classify(struct sk_buff *skb, struct tcf_proto *tp,
45 struct tcf_result *res)
46{
47 int r;
48 struct basic_head *head = (struct basic_head *) tp->root;
49 struct basic_filter *f;
50
51 list_for_each_entry(f, &head->flist, link) {
52 if (!tcf_em_tree_match(skb, &f->ematches, NULL))
53 continue;
54 *res = f->res;
55 r = tcf_exts_exec(skb, &f->exts, res);
56 if (r < 0)
57 continue;
58 return r;
59 }
60 return -1;
61}
62
63static unsigned long basic_get(struct tcf_proto *tp, u32 handle)
64{
65 unsigned long l = 0UL;
66 struct basic_head *head = (struct basic_head *) tp->root;
67 struct basic_filter *f;
68
69 if (head == NULL)
70 return 0UL;
71
72 list_for_each_entry(f, &head->flist, link)
73 if (f->handle == handle)
74 l = (unsigned long) f;
75
76 return l;
77}
78
79static void basic_put(struct tcf_proto *tp, unsigned long f)
80{
81}
82
83static int basic_init(struct tcf_proto *tp)
84{
Patrick McHardyd3fa76e2007-03-24 22:13:06 -070085 struct basic_head *head;
86
87 head = kzalloc(sizeof(*head), GFP_KERNEL);
88 if (head == NULL)
89 return -ENOBUFS;
90 INIT_LIST_HEAD(&head->flist);
91 tp->root = head;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return 0;
93}
94
95static inline void basic_delete_filter(struct tcf_proto *tp,
96 struct basic_filter *f)
97{
98 tcf_unbind_filter(tp, &f->res);
99 tcf_exts_destroy(tp, &f->exts);
100 tcf_em_tree_destroy(tp, &f->ematches);
101 kfree(f);
102}
103
104static void basic_destroy(struct tcf_proto *tp)
105{
106 struct basic_head *head = (struct basic_head *) xchg(&tp->root, NULL);
107 struct basic_filter *f, *n;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 list_for_each_entry_safe(f, n, &head->flist, link) {
110 list_del(&f->link);
111 basic_delete_filter(tp, f);
112 }
Patrick McHardy31ba5482007-03-30 13:36:23 -0700113 kfree(head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116static int basic_delete(struct tcf_proto *tp, unsigned long arg)
117{
118 struct basic_head *head = (struct basic_head *) tp->root;
119 struct basic_filter *t, *f = (struct basic_filter *) arg;
120
121 list_for_each_entry(t, &head->flist, link)
122 if (t == f) {
123 tcf_tree_lock(tp);
124 list_del(&t->link);
125 tcf_tree_unlock(tp);
126 basic_delete_filter(tp, t);
127 return 0;
128 }
129
130 return -ENOENT;
131}
132
133static inline int basic_set_parms(struct tcf_proto *tp, struct basic_filter *f,
134 unsigned long base, struct rtattr **tb,
135 struct rtattr *est)
136{
137 int err = -EINVAL;
138 struct tcf_exts e;
139 struct tcf_ematch_tree t;
140
141 if (tb[TCA_BASIC_CLASSID-1])
142 if (RTA_PAYLOAD(tb[TCA_BASIC_CLASSID-1]) < sizeof(u32))
143 return err;
144
145 err = tcf_exts_validate(tp, tb, est, &e, &basic_ext_map);
146 if (err < 0)
147 return err;
148
149 err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES-1], &t);
150 if (err < 0)
151 goto errout;
152
153 if (tb[TCA_BASIC_CLASSID-1]) {
154 f->res.classid = *(u32*)RTA_DATA(tb[TCA_BASIC_CLASSID-1]);
155 tcf_bind_filter(tp, &f->res, base);
156 }
157
158 tcf_exts_change(tp, &f->exts, &e);
159 tcf_em_tree_change(tp, &f->ematches, &t);
160
161 return 0;
162errout:
163 tcf_exts_destroy(tp, &e);
164 return err;
165}
166
167static int basic_change(struct tcf_proto *tp, unsigned long base, u32 handle,
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900168 struct rtattr **tca, unsigned long *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
170 int err = -EINVAL;
171 struct basic_head *head = (struct basic_head *) tp->root;
172 struct rtattr *tb[TCA_BASIC_MAX];
173 struct basic_filter *f = (struct basic_filter *) *arg;
174
175 if (tca[TCA_OPTIONS-1] == NULL)
176 return -EINVAL;
177
178 if (rtattr_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS-1]) < 0)
179 return -EINVAL;
180
181 if (f != NULL) {
182 if (handle && f->handle != handle)
183 return -EINVAL;
184 return basic_set_parms(tp, f, base, tb, tca[TCA_RATE-1]);
185 }
186
187 err = -ENOBUFS;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700188 f = kzalloc(sizeof(*f), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 if (f == NULL)
190 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 err = -EINVAL;
193 if (handle)
194 f->handle = handle;
195 else {
Kim Nordlund658270a2006-09-27 16:19:53 -0700196 unsigned int i = 0x80000000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 do {
198 if (++head->hgenerator == 0x7FFFFFFF)
199 head->hgenerator = 1;
200 } while (--i > 0 && basic_get(tp, head->hgenerator));
201
202 if (i <= 0) {
203 printk(KERN_ERR "Insufficient number of handles\n");
204 goto errout;
205 }
206
207 f->handle = head->hgenerator;
208 }
209
210 err = basic_set_parms(tp, f, base, tb, tca[TCA_RATE-1]);
211 if (err < 0)
212 goto errout;
213
214 tcf_tree_lock(tp);
215 list_add(&f->link, &head->flist);
216 tcf_tree_unlock(tp);
217 *arg = (unsigned long) f;
218
219 return 0;
220errout:
221 if (*arg == 0UL && f)
222 kfree(f);
223
224 return err;
225}
226
227static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
228{
229 struct basic_head *head = (struct basic_head *) tp->root;
230 struct basic_filter *f;
231
232 list_for_each_entry(f, &head->flist, link) {
233 if (arg->count < arg->skip)
234 goto skip;
235
236 if (arg->fn(tp, (unsigned long) f, arg) < 0) {
237 arg->stop = 1;
238 break;
239 }
240skip:
241 arg->count++;
242 }
243}
244
245static int basic_dump(struct tcf_proto *tp, unsigned long fh,
246 struct sk_buff *skb, struct tcmsg *t)
247{
248 struct basic_filter *f = (struct basic_filter *) fh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700249 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 struct rtattr *rta;
251
252 if (f == NULL)
253 return skb->len;
254
255 t->tcm_handle = f->handle;
256
257 rta = (struct rtattr *) b;
258 RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
259
Thomas Grafe1e284a2005-06-08 15:11:02 -0700260 if (f->res.classid)
261 RTA_PUT(skb, TCA_BASIC_CLASSID, sizeof(u32), &f->res.classid);
262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 if (tcf_exts_dump(skb, &f->exts, &basic_ext_map) < 0 ||
264 tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
265 goto rtattr_failure;
266
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700267 rta->rta_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return skb->len;
269
270rtattr_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700271 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return -1;
273}
274
275static struct tcf_proto_ops cls_basic_ops = {
276 .kind = "basic",
277 .classify = basic_classify,
278 .init = basic_init,
279 .destroy = basic_destroy,
280 .get = basic_get,
281 .put = basic_put,
282 .change = basic_change,
283 .delete = basic_delete,
284 .walk = basic_walk,
285 .dump = basic_dump,
286 .owner = THIS_MODULE,
287};
288
289static int __init init_basic(void)
290{
291 return register_tcf_proto_ops(&cls_basic_ops);
292}
293
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900294static void __exit exit_basic(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
296 unregister_tcf_proto_ops(&cls_basic_ops);
297}
298
299module_init(init_basic)
300module_exit(exit_basic)
301MODULE_LICENSE("GPL");
302