]>
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> | |
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 | ||
8113c095 | 59 | static void *basic_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 60 | { |
9888faef | 61 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
62 | struct basic_filter *f; |
63 | ||
1c1bc6bd DB |
64 | list_for_each_entry(f, &head->flist, link) { |
65 | if (f->handle == handle) { | |
8113c095 | 66 | return f; |
1c1bc6bd DB |
67 | } |
68 | } | |
1da177e4 | 69 | |
8113c095 | 70 | return NULL; |
1da177e4 LT |
71 | } |
72 | ||
1da177e4 LT |
73 | static int basic_init(struct tcf_proto *tp) |
74 | { | |
d3fa76ee PM |
75 | struct basic_head *head; |
76 | ||
77 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
78 | if (head == NULL) | |
79 | return -ENOBUFS; | |
80 | INIT_LIST_HEAD(&head->flist); | |
9888faef | 81 | rcu_assign_pointer(tp->root, head); |
1da177e4 LT |
82 | return 0; |
83 | } | |
84 | ||
9888faef | 85 | static void basic_delete_filter(struct rcu_head *head) |
1da177e4 | 86 | { |
9888faef | 87 | struct basic_filter *f = container_of(head, struct basic_filter, rcu); |
9888faef | 88 | |
18d0264f | 89 | tcf_exts_destroy(&f->exts); |
82a470f1 | 90 | tcf_em_tree_destroy(&f->ematches); |
1da177e4 LT |
91 | kfree(f); |
92 | } | |
93 | ||
763dbf63 | 94 | static void basic_destroy(struct tcf_proto *tp) |
1da177e4 | 95 | { |
9888faef | 96 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 | 97 | struct basic_filter *f, *n; |
10297b99 | 98 | |
1da177e4 | 99 | list_for_each_entry_safe(f, n, &head->flist, link) { |
9888faef | 100 | list_del_rcu(&f->link); |
18cdb37e | 101 | tcf_unbind_filter(tp, &f->res); |
9888faef | 102 | call_rcu(&f->rcu, basic_delete_filter); |
1da177e4 | 103 | } |
9888faef | 104 | kfree_rcu(head, rcu); |
1da177e4 LT |
105 | } |
106 | ||
8113c095 | 107 | static int basic_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 108 | { |
763dbf63 | 109 | struct basic_head *head = rtnl_dereference(tp->root); |
8113c095 | 110 | struct basic_filter *f = arg; |
1da177e4 | 111 | |
e4386456 JP |
112 | list_del_rcu(&f->link); |
113 | tcf_unbind_filter(tp, &f->res); | |
114 | call_rcu(&f->rcu, basic_delete_filter); | |
763dbf63 | 115 | *last = list_empty(&head->flist); |
e4386456 | 116 | return 0; |
1da177e4 LT |
117 | } |
118 | ||
6fa8c014 PM |
119 | static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { |
120 | [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, | |
121 | [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, | |
122 | }; | |
123 | ||
c1b52739 BL |
124 | static int basic_set_parms(struct net *net, struct tcf_proto *tp, |
125 | struct basic_filter *f, unsigned long base, | |
126 | struct nlattr **tb, | |
2f7ef2f8 | 127 | struct nlattr *est, bool ovr) |
1da177e4 | 128 | { |
6459082a | 129 | int err; |
1da177e4 | 130 | |
ff1f8ca0 | 131 | err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr); |
1da177e4 LT |
132 | if (err < 0) |
133 | return err; | |
134 | ||
4ebc1e3c | 135 | err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &f->ematches); |
1da177e4 | 136 | if (err < 0) |
ff1f8ca0 | 137 | return err; |
1da177e4 | 138 | |
add93b61 | 139 | if (tb[TCA_BASIC_CLASSID]) { |
1587bac4 | 140 | f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); |
1da177e4 LT |
141 | tcf_bind_filter(tp, &f->res, base); |
142 | } | |
143 | ||
9888faef | 144 | f->tp = tp; |
1da177e4 | 145 | return 0; |
1da177e4 LT |
146 | } |
147 | ||
c1b52739 | 148 | static int basic_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 149 | struct tcf_proto *tp, unsigned long base, u32 handle, |
8113c095 | 150 | struct nlattr **tca, void **arg, bool ovr) |
1da177e4 | 151 | { |
cee63723 | 152 | int err; |
9888faef | 153 | struct basic_head *head = rtnl_dereference(tp->root); |
add93b61 | 154 | struct nlattr *tb[TCA_BASIC_MAX + 1]; |
9888faef JF |
155 | struct basic_filter *fold = (struct basic_filter *) *arg; |
156 | struct basic_filter *fnew; | |
1da177e4 | 157 | |
add93b61 | 158 | if (tca[TCA_OPTIONS] == NULL) |
1da177e4 LT |
159 | return -EINVAL; |
160 | ||
6fa8c014 | 161 | err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], |
fceb6435 | 162 | basic_policy, NULL); |
cee63723 PM |
163 | if (err < 0) |
164 | return err; | |
1da177e4 | 165 | |
9888faef JF |
166 | if (fold != NULL) { |
167 | if (handle && fold->handle != handle) | |
1da177e4 | 168 | return -EINVAL; |
1da177e4 LT |
169 | } |
170 | ||
9888faef | 171 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
bd42b788 JP |
172 | if (!fnew) |
173 | return -ENOBUFS; | |
1da177e4 | 174 | |
b9a24bb7 WC |
175 | err = tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
176 | if (err < 0) | |
177 | goto errout; | |
178 | ||
1da177e4 | 179 | err = -EINVAL; |
9888faef JF |
180 | if (handle) { |
181 | fnew->handle = handle; | |
182 | } else if (fold) { | |
183 | fnew->handle = fold->handle; | |
184 | } else { | |
658270a0 | 185 | unsigned int i = 0x80000000; |
1da177e4 LT |
186 | do { |
187 | if (++head->hgenerator == 0x7FFFFFFF) | |
188 | head->hgenerator = 1; | |
189 | } while (--i > 0 && basic_get(tp, head->hgenerator)); | |
190 | ||
191 | if (i <= 0) { | |
cc7ec456 | 192 | pr_err("Insufficient number of handles\n"); |
1da177e4 LT |
193 | goto errout; |
194 | } | |
195 | ||
9888faef | 196 | fnew->handle = head->hgenerator; |
1da177e4 LT |
197 | } |
198 | ||
9888faef | 199 | err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr); |
1da177e4 LT |
200 | if (err < 0) |
201 | goto errout; | |
202 | ||
8113c095 | 203 | *arg = fnew; |
9888faef JF |
204 | |
205 | if (fold) { | |
206 | list_replace_rcu(&fold->link, &fnew->link); | |
18cdb37e | 207 | tcf_unbind_filter(tp, &fold->res); |
9888faef JF |
208 | call_rcu(&fold->rcu, basic_delete_filter); |
209 | } else { | |
210 | list_add_rcu(&fnew->link, &head->flist); | |
211 | } | |
1da177e4 LT |
212 | |
213 | return 0; | |
214 | errout: | |
b9a24bb7 | 215 | tcf_exts_destroy(&fnew->exts); |
9888faef | 216 | kfree(fnew); |
1da177e4 LT |
217 | return err; |
218 | } | |
219 | ||
220 | static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
221 | { | |
9888faef | 222 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
223 | struct basic_filter *f; |
224 | ||
225 | list_for_each_entry(f, &head->flist, link) { | |
226 | if (arg->count < arg->skip) | |
227 | goto skip; | |
228 | ||
8113c095 | 229 | if (arg->fn(tp, f, arg) < 0) { |
1da177e4 LT |
230 | arg->stop = 1; |
231 | break; | |
232 | } | |
233 | skip: | |
234 | arg->count++; | |
235 | } | |
236 | } | |
237 | ||
8113c095 | 238 | static int basic_dump(struct net *net, struct tcf_proto *tp, void *fh, |
1da177e4 LT |
239 | struct sk_buff *skb, struct tcmsg *t) |
240 | { | |
8113c095 | 241 | struct basic_filter *f = fh; |
4b3550ef | 242 | struct nlattr *nest; |
1da177e4 LT |
243 | |
244 | if (f == NULL) | |
245 | return skb->len; | |
246 | ||
247 | t->tcm_handle = f->handle; | |
248 | ||
4b3550ef PM |
249 | nest = nla_nest_start(skb, TCA_OPTIONS); |
250 | if (nest == NULL) | |
251 | goto nla_put_failure; | |
1da177e4 | 252 | |
1b34ec43 DM |
253 | if (f->res.classid && |
254 | nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid)) | |
255 | goto nla_put_failure; | |
e1e284a4 | 256 | |
5da57f42 | 257 | if (tcf_exts_dump(skb, &f->exts) < 0 || |
1da177e4 | 258 | tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0) |
add93b61 | 259 | goto nla_put_failure; |
1da177e4 | 260 | |
4b3550ef | 261 | nla_nest_end(skb, nest); |
4c46ee52 | 262 | |
5da57f42 | 263 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
4c46ee52 | 264 | goto nla_put_failure; |
265 | ||
1da177e4 LT |
266 | return skb->len; |
267 | ||
add93b61 | 268 | nla_put_failure: |
4b3550ef | 269 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
270 | return -1; |
271 | } | |
272 | ||
2eb9d75c | 273 | static struct tcf_proto_ops cls_basic_ops __read_mostly = { |
1da177e4 LT |
274 | .kind = "basic", |
275 | .classify = basic_classify, | |
276 | .init = basic_init, | |
277 | .destroy = basic_destroy, | |
278 | .get = basic_get, | |
1da177e4 LT |
279 | .change = basic_change, |
280 | .delete = basic_delete, | |
281 | .walk = basic_walk, | |
282 | .dump = basic_dump, | |
283 | .owner = THIS_MODULE, | |
284 | }; | |
285 | ||
286 | static int __init init_basic(void) | |
287 | { | |
288 | return register_tcf_proto_ops(&cls_basic_ops); | |
289 | } | |
290 | ||
10297b99 | 291 | static void __exit exit_basic(void) |
1da177e4 LT |
292 | { |
293 | unregister_tcf_proto_ops(&cls_basic_ops); | |
294 | } | |
295 | ||
296 | module_init(init_basic) | |
297 | module_exit(exit_basic) | |
298 | MODULE_LICENSE("GPL"); | |
299 |