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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; | |
9888faef | 27 | struct rcu_head rcu; |
1da177e4 LT |
28 | }; |
29 | ||
cc7ec456 | 30 | struct basic_filter { |
1da177e4 LT |
31 | u32 handle; |
32 | struct tcf_exts exts; | |
33 | struct tcf_ematch_tree ematches; | |
34 | struct tcf_result res; | |
9888faef | 35 | struct tcf_proto *tp; |
1da177e4 | 36 | struct list_head link; |
9888faef | 37 | struct rcu_head rcu; |
1da177e4 LT |
38 | }; |
39 | ||
dc7f9f6e | 40 | static int basic_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
41 | struct tcf_result *res) |
42 | { | |
43 | int r; | |
9888faef | 44 | struct basic_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
45 | struct basic_filter *f; |
46 | ||
9888faef | 47 | list_for_each_entry_rcu(f, &head->flist, link) { |
1da177e4 LT |
48 | if (!tcf_em_tree_match(skb, &f->ematches, NULL)) |
49 | continue; | |
50 | *res = f->res; | |
51 | r = tcf_exts_exec(skb, &f->exts, res); | |
52 | if (r < 0) | |
53 | continue; | |
54 | return r; | |
55 | } | |
56 | return -1; | |
57 | } | |
58 | ||
59 | static unsigned long basic_get(struct tcf_proto *tp, u32 handle) | |
60 | { | |
61 | unsigned long l = 0UL; | |
9888faef | 62 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
63 | struct basic_filter *f; |
64 | ||
65 | if (head == NULL) | |
66 | return 0UL; | |
67 | ||
68 | list_for_each_entry(f, &head->flist, link) | |
69 | if (f->handle == handle) | |
70 | l = (unsigned long) f; | |
71 | ||
72 | return l; | |
73 | } | |
74 | ||
75 | static void basic_put(struct tcf_proto *tp, unsigned long f) | |
76 | { | |
77 | } | |
78 | ||
79 | static int basic_init(struct tcf_proto *tp) | |
80 | { | |
d3fa76ee PM |
81 | struct basic_head *head; |
82 | ||
83 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
84 | if (head == NULL) | |
85 | return -ENOBUFS; | |
86 | INIT_LIST_HEAD(&head->flist); | |
9888faef | 87 | rcu_assign_pointer(tp->root, head); |
1da177e4 LT |
88 | return 0; |
89 | } | |
90 | ||
9888faef | 91 | static void basic_delete_filter(struct rcu_head *head) |
1da177e4 | 92 | { |
9888faef JF |
93 | struct basic_filter *f = container_of(head, struct basic_filter, rcu); |
94 | struct tcf_proto *tp = f->tp; | |
95 | ||
1da177e4 | 96 | tcf_unbind_filter(tp, &f->res); |
18d0264f | 97 | tcf_exts_destroy(&f->exts); |
82a470f1 | 98 | tcf_em_tree_destroy(&f->ematches); |
1da177e4 LT |
99 | kfree(f); |
100 | } | |
101 | ||
102 | static void basic_destroy(struct tcf_proto *tp) | |
103 | { | |
9888faef | 104 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 | 105 | struct basic_filter *f, *n; |
10297b99 | 106 | |
1da177e4 | 107 | list_for_each_entry_safe(f, n, &head->flist, link) { |
9888faef JF |
108 | list_del_rcu(&f->link); |
109 | call_rcu(&f->rcu, basic_delete_filter); | |
1da177e4 | 110 | } |
9888faef JF |
111 | RCU_INIT_POINTER(tp->root, NULL); |
112 | kfree_rcu(head, rcu); | |
1da177e4 LT |
113 | } |
114 | ||
115 | static int basic_delete(struct tcf_proto *tp, unsigned long arg) | |
116 | { | |
9888faef | 117 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
118 | struct basic_filter *t, *f = (struct basic_filter *) arg; |
119 | ||
120 | list_for_each_entry(t, &head->flist, link) | |
121 | if (t == f) { | |
9888faef JF |
122 | list_del_rcu(&t->link); |
123 | call_rcu(&t->rcu, basic_delete_filter); | |
1da177e4 LT |
124 | return 0; |
125 | } | |
126 | ||
127 | return -ENOENT; | |
128 | } | |
129 | ||
6fa8c014 PM |
130 | static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { |
131 | [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, | |
132 | [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, | |
133 | }; | |
134 | ||
c1b52739 BL |
135 | static int basic_set_parms(struct net *net, struct tcf_proto *tp, |
136 | struct basic_filter *f, unsigned long base, | |
137 | struct nlattr **tb, | |
2f7ef2f8 | 138 | struct nlattr *est, bool ovr) |
1da177e4 | 139 | { |
6459082a | 140 | int err; |
1da177e4 LT |
141 | struct tcf_exts e; |
142 | struct tcf_ematch_tree t; | |
143 | ||
5da57f42 | 144 | tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
2f7ef2f8 | 145 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
146 | if (err < 0) |
147 | return err; | |
148 | ||
add93b61 | 149 | err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t); |
1da177e4 LT |
150 | if (err < 0) |
151 | goto errout; | |
152 | ||
add93b61 | 153 | if (tb[TCA_BASIC_CLASSID]) { |
1587bac4 | 154 | f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); |
1da177e4 LT |
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); | |
9888faef | 160 | f->tp = tp; |
1da177e4 LT |
161 | |
162 | return 0; | |
163 | errout: | |
18d0264f | 164 | tcf_exts_destroy(&e); |
1da177e4 LT |
165 | return err; |
166 | } | |
167 | ||
c1b52739 | 168 | static int basic_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 169 | struct tcf_proto *tp, unsigned long base, u32 handle, |
2f7ef2f8 | 170 | struct nlattr **tca, unsigned long *arg, bool ovr) |
1da177e4 | 171 | { |
cee63723 | 172 | int err; |
9888faef | 173 | struct basic_head *head = rtnl_dereference(tp->root); |
add93b61 | 174 | struct nlattr *tb[TCA_BASIC_MAX + 1]; |
9888faef JF |
175 | struct basic_filter *fold = (struct basic_filter *) *arg; |
176 | struct basic_filter *fnew; | |
1da177e4 | 177 | |
add93b61 | 178 | if (tca[TCA_OPTIONS] == NULL) |
1da177e4 LT |
179 | return -EINVAL; |
180 | ||
6fa8c014 PM |
181 | err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], |
182 | basic_policy); | |
cee63723 PM |
183 | if (err < 0) |
184 | return err; | |
1da177e4 | 185 | |
9888faef JF |
186 | if (fold != NULL) { |
187 | if (handle && fold->handle != handle) | |
1da177e4 | 188 | return -EINVAL; |
1da177e4 LT |
189 | } |
190 | ||
191 | err = -ENOBUFS; | |
9888faef JF |
192 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
193 | if (fnew == NULL) | |
1da177e4 | 194 | goto errout; |
1da177e4 | 195 | |
9888faef | 196 | tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
1da177e4 | 197 | err = -EINVAL; |
9888faef JF |
198 | if (handle) { |
199 | fnew->handle = handle; | |
200 | } else if (fold) { | |
201 | fnew->handle = fold->handle; | |
202 | } else { | |
658270a0 | 203 | unsigned int i = 0x80000000; |
1da177e4 LT |
204 | do { |
205 | if (++head->hgenerator == 0x7FFFFFFF) | |
206 | head->hgenerator = 1; | |
207 | } while (--i > 0 && basic_get(tp, head->hgenerator)); | |
208 | ||
209 | if (i <= 0) { | |
cc7ec456 | 210 | pr_err("Insufficient number of handles\n"); |
1da177e4 LT |
211 | goto errout; |
212 | } | |
213 | ||
9888faef | 214 | fnew->handle = head->hgenerator; |
1da177e4 LT |
215 | } |
216 | ||
9888faef | 217 | err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr); |
1da177e4 LT |
218 | if (err < 0) |
219 | goto errout; | |
220 | ||
9888faef JF |
221 | *arg = (unsigned long)fnew; |
222 | ||
223 | if (fold) { | |
224 | list_replace_rcu(&fold->link, &fnew->link); | |
225 | call_rcu(&fold->rcu, basic_delete_filter); | |
226 | } else { | |
227 | list_add_rcu(&fnew->link, &head->flist); | |
228 | } | |
1da177e4 LT |
229 | |
230 | return 0; | |
231 | errout: | |
9888faef | 232 | kfree(fnew); |
1da177e4 LT |
233 | return err; |
234 | } | |
235 | ||
236 | static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
237 | { | |
9888faef | 238 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
239 | struct basic_filter *f; |
240 | ||
241 | list_for_each_entry(f, &head->flist, link) { | |
242 | if (arg->count < arg->skip) | |
243 | goto skip; | |
244 | ||
245 | if (arg->fn(tp, (unsigned long) f, arg) < 0) { | |
246 | arg->stop = 1; | |
247 | break; | |
248 | } | |
249 | skip: | |
250 | arg->count++; | |
251 | } | |
252 | } | |
253 | ||
832d1d5b | 254 | static int basic_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
255 | struct sk_buff *skb, struct tcmsg *t) |
256 | { | |
257 | struct basic_filter *f = (struct basic_filter *) fh; | |
4b3550ef | 258 | struct nlattr *nest; |
1da177e4 LT |
259 | |
260 | if (f == NULL) | |
261 | return skb->len; | |
262 | ||
263 | t->tcm_handle = f->handle; | |
264 | ||
4b3550ef PM |
265 | nest = nla_nest_start(skb, TCA_OPTIONS); |
266 | if (nest == NULL) | |
267 | goto nla_put_failure; | |
1da177e4 | 268 | |
1b34ec43 DM |
269 | if (f->res.classid && |
270 | nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid)) | |
271 | goto nla_put_failure; | |
e1e284a4 | 272 | |
5da57f42 | 273 | if (tcf_exts_dump(skb, &f->exts) < 0 || |
1da177e4 | 274 | tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0) |
add93b61 | 275 | goto nla_put_failure; |
1da177e4 | 276 | |
4b3550ef | 277 | nla_nest_end(skb, nest); |
4c46ee52 | 278 | |
5da57f42 | 279 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
4c46ee52 | 280 | goto nla_put_failure; |
281 | ||
1da177e4 LT |
282 | return skb->len; |
283 | ||
add93b61 | 284 | nla_put_failure: |
4b3550ef | 285 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
286 | return -1; |
287 | } | |
288 | ||
2eb9d75c | 289 | static struct tcf_proto_ops cls_basic_ops __read_mostly = { |
1da177e4 LT |
290 | .kind = "basic", |
291 | .classify = basic_classify, | |
292 | .init = basic_init, | |
293 | .destroy = basic_destroy, | |
294 | .get = basic_get, | |
295 | .put = basic_put, | |
296 | .change = basic_change, | |
297 | .delete = basic_delete, | |
298 | .walk = basic_walk, | |
299 | .dump = basic_dump, | |
300 | .owner = THIS_MODULE, | |
301 | }; | |
302 | ||
303 | static int __init init_basic(void) | |
304 | { | |
305 | return register_tcf_proto_ops(&cls_basic_ops); | |
306 | } | |
307 | ||
10297b99 | 308 | static void __exit exit_basic(void) |
1da177e4 LT |
309 | { |
310 | unregister_tcf_proto_ops(&cls_basic_ops); | |
311 | } | |
312 | ||
313 | module_init(init_basic) | |
314 | module_exit(exit_basic) | |
315 | MODULE_LICENSE("GPL"); | |
316 |