Commit | Line | Data |
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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> | |
dc5fc579 | 20 | #include <net/netlink.h> |
1da177e4 LT |
21 | #include <net/act_api.h> |
22 | #include <net/pkt_cls.h> | |
23 | ||
cc7ec456 | 24 | struct basic_head { |
1da177e4 LT |
25 | u32 hgenerator; |
26 | struct list_head flist; | |
27 | }; | |
28 | ||
cc7ec456 | 29 | struct basic_filter { |
1da177e4 LT |
30 | u32 handle; |
31 | struct tcf_exts exts; | |
32 | struct tcf_ematch_tree ematches; | |
33 | struct tcf_result res; | |
34 | struct list_head link; | |
35 | }; | |
36 | ||
dc7f9f6e | 37 | static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
38 | struct tcf_result *res) |
39 | { | |
40 | int r; | |
a8701a6c | 41 | struct basic_head *head = tp->root; |
1da177e4 LT |
42 | struct basic_filter *f; |
43 | ||
44 | list_for_each_entry(f, &head->flist, link) { | |
45 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) | |
46 | continue; | |
47 | *res = f->res; | |
48 | r = tcf_exts_exec(skb, &f->exts, res); | |
49 | if (r < 0) | |
50 | continue; | |
51 | return r; | |
52 | } | |
53 | return -1; | |
54 | } | |
55 | ||
56 | static unsigned long basic_get(struct tcf_proto *tp, u32 handle) | |
57 | { | |
58 | unsigned long l = 0UL; | |
a8701a6c | 59 | struct basic_head *head = tp->root; |
1da177e4 LT |
60 | struct basic_filter *f; |
61 | ||
62 | if (head == NULL) | |
63 | return 0UL; | |
64 | ||
65 | list_for_each_entry(f, &head->flist, link) | |
66 | if (f->handle == handle) | |
67 | l = (unsigned long) f; | |
68 | ||
69 | return l; | |
70 | } | |
71 | ||
72 | static void basic_put(struct tcf_proto *tp, unsigned long f) | |
73 | { | |
74 | } | |
75 | ||
76 | static int basic_init(struct tcf_proto *tp) | |
77 | { | |
d3fa76ee PM |
78 | struct basic_head *head; |
79 | ||
80 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
81 | if (head == NULL) | |
82 | return -ENOBUFS; | |
83 | INIT_LIST_HEAD(&head->flist); | |
84 | tp->root = head; | |
1da177e4 LT |
85 | return 0; |
86 | } | |
87 | ||
cc7ec456 | 88 | static void basic_delete_filter(struct tcf_proto *tp, struct basic_filter *f) |
1da177e4 LT |
89 | { |
90 | tcf_unbind_filter(tp, &f->res); | |
91 | tcf_exts_destroy(tp, &f->exts); | |
92 | tcf_em_tree_destroy(tp, &f->ematches); | |
93 | kfree(f); | |
94 | } | |
95 | ||
96 | static void basic_destroy(struct tcf_proto *tp) | |
97 | { | |
47a1a1d4 | 98 | struct basic_head *head = tp->root; |
1da177e4 | 99 | struct basic_filter *f, *n; |
10297b99 | 100 | |
1da177e4 LT |
101 | list_for_each_entry_safe(f, n, &head->flist, link) { |
102 | list_del(&f->link); | |
103 | basic_delete_filter(tp, f); | |
104 | } | |
31ba548f | 105 | kfree(head); |
1da177e4 LT |
106 | } |
107 | ||
108 | static int basic_delete(struct tcf_proto *tp, unsigned long arg) | |
109 | { | |
a8701a6c | 110 | struct basic_head *head = tp->root; |
1da177e4 LT |
111 | struct basic_filter *t, *f = (struct basic_filter *) arg; |
112 | ||
113 | list_for_each_entry(t, &head->flist, link) | |
114 | if (t == f) { | |
115 | tcf_tree_lock(tp); | |
116 | list_del(&t->link); | |
117 | tcf_tree_unlock(tp); | |
118 | basic_delete_filter(tp, t); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | return -ENOENT; | |
123 | } | |
124 | ||
6fa8c014 PM |
125 | static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { |
126 | [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, | |
127 | [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, | |
128 | }; | |
129 | ||
c1b52739 BL |
130 | static int basic_set_parms(struct net *net, struct tcf_proto *tp, |
131 | struct basic_filter *f, unsigned long base, | |
132 | struct nlattr **tb, | |
cc7ec456 | 133 | struct nlattr *est) |
1da177e4 | 134 | { |
6459082a | 135 | int err; |
1da177e4 LT |
136 | struct tcf_exts e; |
137 | struct tcf_ematch_tree t; | |
138 | ||
5da57f42 WC |
139 | tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
140 | err = tcf_exts_validate(net, tp, tb, est, &e); | |
1da177e4 LT |
141 | if (err < 0) |
142 | return err; | |
143 | ||
add93b61 | 144 | err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t); |
1da177e4 LT |
145 | if (err < 0) |
146 | goto errout; | |
147 | ||
add93b61 | 148 | if (tb[TCA_BASIC_CLASSID]) { |
1587bac4 | 149 | f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); |
1da177e4 LT |
150 | tcf_bind_filter(tp, &f->res, base); |
151 | } | |
152 | ||
153 | tcf_exts_change(tp, &f->exts, &e); | |
154 | tcf_em_tree_change(tp, &f->ematches, &t); | |
155 | ||
156 | return 0; | |
157 | errout: | |
158 | tcf_exts_destroy(tp, &e); | |
159 | return err; | |
160 | } | |
161 | ||
c1b52739 | 162 | static int basic_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 163 | struct tcf_proto *tp, unsigned long base, u32 handle, |
add93b61 | 164 | struct nlattr **tca, unsigned long *arg) |
1da177e4 | 165 | { |
cee63723 | 166 | int err; |
a8701a6c | 167 | struct basic_head *head = tp->root; |
add93b61 | 168 | struct nlattr *tb[TCA_BASIC_MAX + 1]; |
1da177e4 LT |
169 | struct basic_filter *f = (struct basic_filter *) *arg; |
170 | ||
add93b61 | 171 | if (tca[TCA_OPTIONS] == NULL) |
1da177e4 LT |
172 | return -EINVAL; |
173 | ||
6fa8c014 PM |
174 | err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], |
175 | basic_policy); | |
cee63723 PM |
176 | if (err < 0) |
177 | return err; | |
1da177e4 LT |
178 | |
179 | if (f != NULL) { | |
180 | if (handle && f->handle != handle) | |
181 | return -EINVAL; | |
c1b52739 | 182 | return basic_set_parms(net, tp, f, base, tb, tca[TCA_RATE]); |
1da177e4 LT |
183 | } |
184 | ||
185 | err = -ENOBUFS; | |
0da974f4 | 186 | f = kzalloc(sizeof(*f), GFP_KERNEL); |
1da177e4 LT |
187 | if (f == NULL) |
188 | goto errout; | |
1da177e4 | 189 | |
5da57f42 | 190 | tcf_exts_init(&f->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
1da177e4 LT |
191 | err = -EINVAL; |
192 | if (handle) | |
193 | f->handle = handle; | |
194 | else { | |
658270a0 | 195 | unsigned int i = 0x80000000; |
1da177e4 LT |
196 | do { |
197 | if (++head->hgenerator == 0x7FFFFFFF) | |
198 | head->hgenerator = 1; | |
199 | } while (--i > 0 && basic_get(tp, head->hgenerator)); | |
200 | ||
201 | if (i <= 0) { | |
cc7ec456 | 202 | pr_err("Insufficient number of handles\n"); |
1da177e4 LT |
203 | goto errout; |
204 | } | |
205 | ||
206 | f->handle = head->hgenerator; | |
207 | } | |
208 | ||
c1b52739 | 209 | err = basic_set_parms(net, tp, f, base, tb, tca[TCA_RATE]); |
1da177e4 LT |
210 | if (err < 0) |
211 | goto errout; | |
212 | ||
213 | tcf_tree_lock(tp); | |
214 | list_add(&f->link, &head->flist); | |
215 | tcf_tree_unlock(tp); | |
216 | *arg = (unsigned long) f; | |
217 | ||
218 | return 0; | |
219 | errout: | |
220 | if (*arg == 0UL && f) | |
221 | kfree(f); | |
222 | ||
223 | return err; | |
224 | } | |
225 | ||
226 | static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
227 | { | |
a8701a6c | 228 | struct basic_head *head = tp->root; |
1da177e4 LT |
229 | struct basic_filter *f; |
230 | ||
231 | list_for_each_entry(f, &head->flist, link) { | |
232 | if (arg->count < arg->skip) | |
233 | goto skip; | |
234 | ||
235 | if (arg->fn(tp, (unsigned long) f, arg) < 0) { | |
236 | arg->stop = 1; | |
237 | break; | |
238 | } | |
239 | skip: | |
240 | arg->count++; | |
241 | } | |
242 | } | |
243 | ||
832d1d5b | 244 | static int basic_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
245 | struct sk_buff *skb, struct tcmsg *t) |
246 | { | |
247 | struct basic_filter *f = (struct basic_filter *) fh; | |
4b3550ef | 248 | struct nlattr *nest; |
1da177e4 LT |
249 | |
250 | if (f == NULL) | |
251 | return skb->len; | |
252 | ||
253 | t->tcm_handle = f->handle; | |
254 | ||
4b3550ef PM |
255 | nest = nla_nest_start(skb, TCA_OPTIONS); |
256 | if (nest == NULL) | |
257 | goto nla_put_failure; | |
1da177e4 | 258 | |
1b34ec43 DM |
259 | if (f->res.classid && |
260 | nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid)) | |
261 | goto nla_put_failure; | |
e1e284a4 | 262 | |
5da57f42 | 263 | if (tcf_exts_dump(skb, &f->exts) < 0 || |
1da177e4 | 264 | tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0) |
add93b61 | 265 | goto nla_put_failure; |
1da177e4 | 266 | |
4b3550ef | 267 | nla_nest_end(skb, nest); |
4c46ee52 | 268 | |
5da57f42 | 269 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
4c46ee52 | 270 | goto nla_put_failure; |
271 | ||
1da177e4 LT |
272 | return skb->len; |
273 | ||
add93b61 | 274 | nla_put_failure: |
4b3550ef | 275 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
276 | return -1; |
277 | } | |
278 | ||
2eb9d75c | 279 | static struct tcf_proto_ops cls_basic_ops __read_mostly = { |
1da177e4 LT |
280 | .kind = "basic", |
281 | .classify = basic_classify, | |
282 | .init = basic_init, | |
283 | .destroy = basic_destroy, | |
284 | .get = basic_get, | |
285 | .put = basic_put, | |
286 | .change = basic_change, | |
287 | .delete = basic_delete, | |
288 | .walk = basic_walk, | |
289 | .dump = basic_dump, | |
290 | .owner = THIS_MODULE, | |
291 | }; | |
292 | ||
293 | static int __init init_basic(void) | |
294 | { | |
295 | return register_tcf_proto_ops(&cls_basic_ops); | |
296 | } | |
297 | ||
10297b99 | 298 | static void __exit exit_basic(void) |
1da177e4 LT |
299 | { |
300 | unregister_tcf_proto_ops(&cls_basic_ops); | |
301 | } | |
302 | ||
303 | module_init(init_basic) | |
304 | module_exit(exit_basic) | |
305 | MODULE_LICENSE("GPL"); | |
306 |