]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 | 12 | #include <linux/module.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/rtnetlink.h> | |
19 | #include <linux/skbuff.h> | |
1d8134fe | 20 | #include <linux/idr.h> |
dc5fc579 | 21 | #include <net/netlink.h> |
1da177e4 LT |
22 | #include <net/act_api.h> |
23 | #include <net/pkt_cls.h> | |
24 | ||
cc7ec456 | 25 | struct basic_head { |
1da177e4 | 26 | struct list_head flist; |
1d8134fe | 27 | struct idr handle_idr; |
9888faef | 28 | struct rcu_head rcu; |
1da177e4 LT |
29 | }; |
30 | ||
cc7ec456 | 31 | struct basic_filter { |
1da177e4 LT |
32 | u32 handle; |
33 | struct tcf_exts exts; | |
34 | struct tcf_ematch_tree ematches; | |
35 | struct tcf_result res; | |
9888faef | 36 | struct tcf_proto *tp; |
1da177e4 | 37 | struct list_head link; |
7afe8e4f | 38 | struct rcu_work rwork; |
1da177e4 LT |
39 | }; |
40 | ||
dc7f9f6e | 41 | static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
42 | struct tcf_result *res) |
43 | { | |
44 | int r; | |
9888faef | 45 | struct basic_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
46 | struct basic_filter *f; |
47 | ||
9888faef | 48 | list_for_each_entry_rcu(f, &head->flist, link) { |
1da177e4 LT |
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 | ||
8113c095 | 60 | static void *basic_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 61 | { |
9888faef | 62 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
63 | struct basic_filter *f; |
64 | ||
1c1bc6bd DB |
65 | list_for_each_entry(f, &head->flist, link) { |
66 | if (f->handle == handle) { | |
8113c095 | 67 | return f; |
1c1bc6bd DB |
68 | } |
69 | } | |
1da177e4 | 70 | |
8113c095 | 71 | return NULL; |
1da177e4 LT |
72 | } |
73 | ||
1da177e4 LT |
74 | static int basic_init(struct tcf_proto *tp) |
75 | { | |
d3fa76ee PM |
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); | |
1d8134fe | 82 | idr_init(&head->handle_idr); |
9888faef | 83 | rcu_assign_pointer(tp->root, head); |
1da177e4 LT |
84 | return 0; |
85 | } | |
86 | ||
0b2a5989 CW |
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 | ||
c96a4838 | 95 | static void basic_delete_filter_work(struct work_struct *work) |
1da177e4 | 96 | { |
7afe8e4f CW |
97 | struct basic_filter *f = container_of(to_rcu_work(work), |
98 | struct basic_filter, | |
99 | rwork); | |
c96a4838 | 100 | rtnl_lock(); |
0b2a5989 | 101 | __basic_delete_filter(f); |
c96a4838 | 102 | rtnl_unlock(); |
1da177e4 LT |
103 | } |
104 | ||
763dbf63 | 105 | static void basic_destroy(struct tcf_proto *tp) |
1da177e4 | 106 | { |
9888faef | 107 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 | 108 | struct basic_filter *f, *n; |
10297b99 | 109 | |
1da177e4 | 110 | list_for_each_entry_safe(f, n, &head->flist, link) { |
9888faef | 111 | list_del_rcu(&f->link); |
18cdb37e | 112 | tcf_unbind_filter(tp, &f->res); |
1d8134fe | 113 | idr_remove_ext(&head->handle_idr, f->handle); |
0b2a5989 | 114 | if (tcf_exts_get_net(&f->exts)) |
7afe8e4f | 115 | tcf_queue_work(&f->rwork, basic_delete_filter_work); |
0b2a5989 CW |
116 | else |
117 | __basic_delete_filter(f); | |
1da177e4 | 118 | } |
1d8134fe | 119 | idr_destroy(&head->handle_idr); |
9888faef | 120 | kfree_rcu(head, rcu); |
1da177e4 LT |
121 | } |
122 | ||
8113c095 | 123 | static int basic_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 124 | { |
763dbf63 | 125 | struct basic_head *head = rtnl_dereference(tp->root); |
8113c095 | 126 | struct basic_filter *f = arg; |
1da177e4 | 127 | |
e4386456 JP |
128 | list_del_rcu(&f->link); |
129 | tcf_unbind_filter(tp, &f->res); | |
1d8134fe | 130 | idr_remove_ext(&head->handle_idr, f->handle); |
0b2a5989 | 131 | tcf_exts_get_net(&f->exts); |
7afe8e4f | 132 | tcf_queue_work(&f->rwork, basic_delete_filter_work); |
763dbf63 | 133 | *last = list_empty(&head->flist); |
e4386456 | 134 | return 0; |
1da177e4 LT |
135 | } |
136 | ||
6fa8c014 PM |
137 | static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { |
138 | [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, | |
139 | [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, | |
140 | }; | |
141 | ||
c1b52739 BL |
142 | static int basic_set_parms(struct net *net, struct tcf_proto *tp, |
143 | struct basic_filter *f, unsigned long base, | |
144 | struct nlattr **tb, | |
2f7ef2f8 | 145 | struct nlattr *est, bool ovr) |
1da177e4 | 146 | { |
6459082a | 147 | int err; |
1da177e4 | 148 | |
ff1f8ca0 | 149 | err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr); |
1da177e4 LT |
150 | if (err < 0) |
151 | return err; | |
152 | ||
4ebc1e3c | 153 | err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches); |
1da177e4 | 154 | if (err < 0) |
ff1f8ca0 | 155 | return err; |
1da177e4 | 156 | |
add93b61 | 157 | if (tb[TCA_BASIC_CLASSID]) { |
1587bac4 | 158 | f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); |
1da177e4 LT |
159 | tcf_bind_filter(tp, &f->res, base); |
160 | } | |
161 | ||
9888faef | 162 | f->tp = tp; |
1da177e4 | 163 | return 0; |
1da177e4 LT |
164 | } |
165 | ||
c1b52739 | 166 | static int basic_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 167 | struct tcf_proto *tp, unsigned long base, u32 handle, |
8113c095 | 168 | struct nlattr **tca, void **arg, bool ovr) |
1da177e4 | 169 | { |
cee63723 | 170 | int err; |
9888faef | 171 | struct basic_head *head = rtnl_dereference(tp->root); |
add93b61 | 172 | struct nlattr *tb[TCA_BASIC_MAX + 1]; |
9888faef JF |
173 | struct basic_filter *fold = (struct basic_filter *) *arg; |
174 | struct basic_filter *fnew; | |
1d8134fe | 175 | unsigned long idr_index; |
1da177e4 | 176 | |
add93b61 | 177 | if (tca[TCA_OPTIONS] == NULL) |
1da177e4 LT |
178 | return -EINVAL; |
179 | ||
6fa8c014 | 180 | err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], |
fceb6435 | 181 | basic_policy, NULL); |
cee63723 PM |
182 | if (err < 0) |
183 | return err; | |
1da177e4 | 184 | |
9888faef JF |
185 | if (fold != NULL) { |
186 | if (handle && fold->handle != handle) | |
1da177e4 | 187 | return -EINVAL; |
1da177e4 LT |
188 | } |
189 | ||
9888faef | 190 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
bd42b788 JP |
191 | if (!fnew) |
192 | return -ENOBUFS; | |
1da177e4 | 193 | |
fb6ad63b | 194 | err = tcf_exts_init(&fnew->exts, net, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
b9a24bb7 WC |
195 | if (err < 0) |
196 | goto errout; | |
197 | ||
9888faef JF |
198 | if (handle) { |
199 | fnew->handle = handle; | |
1d8134fe CW |
200 | if (!fold) { |
201 | err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index, | |
202 | handle, handle + 1, GFP_KERNEL); | |
203 | if (err) | |
204 | goto errout; | |
205 | } | |
9888faef | 206 | } else { |
1d8134fe CW |
207 | err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index, |
208 | 1, 0x7FFFFFFF, GFP_KERNEL); | |
209 | if (err) | |
1da177e4 | 210 | goto errout; |
1d8134fe | 211 | fnew->handle = idr_index; |
1da177e4 LT |
212 | } |
213 | ||
9888faef | 214 | err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr); |
1d8134fe CW |
215 | if (err < 0) { |
216 | if (!fold) | |
217 | idr_remove_ext(&head->handle_idr, fnew->handle); | |
1da177e4 | 218 | goto errout; |
1d8134fe | 219 | } |
1da177e4 | 220 | |
8113c095 | 221 | *arg = fnew; |
9888faef JF |
222 | |
223 | if (fold) { | |
1d8134fe | 224 | idr_replace_ext(&head->handle_idr, fnew, fnew->handle); |
9888faef | 225 | list_replace_rcu(&fold->link, &fnew->link); |
18cdb37e | 226 | tcf_unbind_filter(tp, &fold->res); |
0b2a5989 | 227 | tcf_exts_get_net(&fold->exts); |
7afe8e4f | 228 | tcf_queue_work(&fold->rwork, basic_delete_filter_work); |
9888faef JF |
229 | } else { |
230 | list_add_rcu(&fnew->link, &head->flist); | |
231 | } | |
1da177e4 LT |
232 | |
233 | return 0; | |
234 | errout: | |
b9a24bb7 | 235 | tcf_exts_destroy(&fnew->exts); |
9888faef | 236 | kfree(fnew); |
1da177e4 LT |
237 | return err; |
238 | } | |
239 | ||
240 | static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
241 | { | |
9888faef | 242 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
243 | struct basic_filter *f; |
244 | ||
245 | list_for_each_entry(f, &head->flist, link) { | |
246 | if (arg->count < arg->skip) | |
247 | goto skip; | |
248 | ||
8113c095 | 249 | if (arg->fn(tp, f, arg) < 0) { |
1da177e4 LT |
250 | arg->stop = 1; |
251 | break; | |
252 | } | |
253 | skip: | |
254 | arg->count++; | |
255 | } | |
256 | } | |
257 | ||
e46e33f5 CW |
258 | static void basic_bind_class(void *fh, u32 classid, unsigned long cl, void *q, |
259 | unsigned long base) | |
07d79fc7 CW |
260 | { |
261 | struct basic_filter *f = fh; | |
262 | ||
e46e33f5 CW |
263 | if (f && f->res.classid == classid) { |
264 | if (cl) | |
265 | __tcf_bind_filter(q, &f->res, base); | |
266 | else | |
267 | __tcf_unbind_filter(q, &f->res); | |
268 | } | |
07d79fc7 CW |
269 | } |
270 | ||
8113c095 | 271 | static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh, |
1da177e4 LT |
272 | struct sk_buff *skb, struct tcmsg *t) |
273 | { | |
8113c095 | 274 | struct basic_filter *f = fh; |
4b3550ef | 275 | struct nlattr *nest; |
1da177e4 LT |
276 | |
277 | if (f == NULL) | |
278 | return skb->len; | |
279 | ||
280 | t->tcm_handle = f->handle; | |
281 | ||
4b3550ef PM |
282 | nest = nla_nest_start(skb, TCA_OPTIONS); |
283 | if (nest == NULL) | |
284 | goto nla_put_failure; | |
1da177e4 | 285 | |
1b34ec43 DM |
286 | if (f->res.classid && |
287 | nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid)) | |
288 | goto nla_put_failure; | |
e1e284a4 | 289 | |
5da57f42 | 290 | if (tcf_exts_dump(skb, &f->exts) < 0 || |
1da177e4 | 291 | tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0) |
add93b61 | 292 | goto nla_put_failure; |
1da177e4 | 293 | |
4b3550ef | 294 | nla_nest_end(skb, nest); |
4c46ee52 | 295 | |
5da57f42 | 296 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
4c46ee52 | 297 | goto nla_put_failure; |
298 | ||
1da177e4 LT |
299 | return skb->len; |
300 | ||
add93b61 | 301 | nla_put_failure: |
4b3550ef | 302 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
303 | return -1; |
304 | } | |
305 | ||
2eb9d75c | 306 | static struct tcf_proto_ops cls_basic_ops __read_mostly = { |
1da177e4 LT |
307 | .kind = "basic", |
308 | .classify = basic_classify, | |
309 | .init = basic_init, | |
310 | .destroy = basic_destroy, | |
311 | .get = basic_get, | |
1da177e4 LT |
312 | .change = basic_change, |
313 | .delete = basic_delete, | |
314 | .walk = basic_walk, | |
315 | .dump = basic_dump, | |
07d79fc7 | 316 | .bind_class = basic_bind_class, |
1da177e4 LT |
317 | .owner = THIS_MODULE, |
318 | }; | |
319 | ||
320 | static int __init init_basic(void) | |
321 | { | |
322 | return register_tcf_proto_ops(&cls_basic_ops); | |
323 | } | |
324 | ||
10297b99 | 325 | static void __exit exit_basic(void) |
1da177e4 LT |
326 | { |
327 | unregister_tcf_proto_ops(&cls_basic_ops); | |
328 | } | |
329 | ||
330 | module_init(init_basic) | |
331 | module_exit(exit_basic) | |
332 | MODULE_LICENSE("GPL"); | |
333 |