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 | ||
1c1bc6bd DB |
68 | list_for_each_entry(f, &head->flist, link) { |
69 | if (f->handle == handle) { | |
1da177e4 | 70 | l = (unsigned long) f; |
1c1bc6bd DB |
71 | break; |
72 | } | |
73 | } | |
1da177e4 LT |
74 | |
75 | return l; | |
76 | } | |
77 | ||
1da177e4 LT |
78 | static int basic_init(struct tcf_proto *tp) |
79 | { | |
d3fa76ee PM |
80 | struct basic_head *head; |
81 | ||
82 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
83 | if (head == NULL) | |
84 | return -ENOBUFS; | |
85 | INIT_LIST_HEAD(&head->flist); | |
9888faef | 86 | rcu_assign_pointer(tp->root, head); |
1da177e4 LT |
87 | return 0; |
88 | } | |
89 | ||
9888faef | 90 | static void basic_delete_filter(struct rcu_head *head) |
1da177e4 | 91 | { |
9888faef | 92 | struct basic_filter *f = container_of(head, struct basic_filter, rcu); |
9888faef | 93 | |
18d0264f | 94 | tcf_exts_destroy(&f->exts); |
82a470f1 | 95 | tcf_em_tree_destroy(&f->ematches); |
1da177e4 LT |
96 | kfree(f); |
97 | } | |
98 | ||
99 | static void basic_destroy(struct tcf_proto *tp) | |
100 | { | |
9888faef | 101 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 | 102 | struct basic_filter *f, *n; |
10297b99 | 103 | |
1da177e4 | 104 | list_for_each_entry_safe(f, n, &head->flist, link) { |
9888faef | 105 | list_del_rcu(&f->link); |
18cdb37e | 106 | tcf_unbind_filter(tp, &f->res); |
9888faef | 107 | call_rcu(&f->rcu, basic_delete_filter); |
1da177e4 | 108 | } |
9888faef JF |
109 | RCU_INIT_POINTER(tp->root, NULL); |
110 | kfree_rcu(head, rcu); | |
1da177e4 LT |
111 | } |
112 | ||
113 | static int basic_delete(struct tcf_proto *tp, unsigned long arg) | |
114 | { | |
e4386456 | 115 | struct basic_filter *f = (struct basic_filter *) arg; |
1da177e4 | 116 | |
e4386456 JP |
117 | list_del_rcu(&f->link); |
118 | tcf_unbind_filter(tp, &f->res); | |
119 | call_rcu(&f->rcu, basic_delete_filter); | |
120 | return 0; | |
1da177e4 LT |
121 | } |
122 | ||
6fa8c014 PM |
123 | static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { |
124 | [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, | |
125 | [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, | |
126 | }; | |
127 | ||
c1b52739 BL |
128 | static int basic_set_parms(struct net *net, struct tcf_proto *tp, |
129 | struct basic_filter *f, unsigned long base, | |
130 | struct nlattr **tb, | |
2f7ef2f8 | 131 | struct nlattr *est, bool ovr) |
1da177e4 | 132 | { |
6459082a | 133 | int err; |
1da177e4 LT |
134 | struct tcf_exts e; |
135 | struct tcf_ematch_tree t; | |
136 | ||
5da57f42 | 137 | tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
2f7ef2f8 | 138 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
139 | if (err < 0) |
140 | return err; | |
141 | ||
add93b61 | 142 | err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t); |
1da177e4 LT |
143 | if (err < 0) |
144 | goto errout; | |
145 | ||
add93b61 | 146 | if (tb[TCA_BASIC_CLASSID]) { |
1587bac4 | 147 | f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); |
1da177e4 LT |
148 | tcf_bind_filter(tp, &f->res, base); |
149 | } | |
150 | ||
151 | tcf_exts_change(tp, &f->exts, &e); | |
152 | tcf_em_tree_change(tp, &f->ematches, &t); | |
9888faef | 153 | f->tp = tp; |
1da177e4 LT |
154 | |
155 | return 0; | |
156 | errout: | |
18d0264f | 157 | tcf_exts_destroy(&e); |
1da177e4 LT |
158 | return err; |
159 | } | |
160 | ||
c1b52739 | 161 | static int basic_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 162 | struct tcf_proto *tp, unsigned long base, u32 handle, |
2f7ef2f8 | 163 | struct nlattr **tca, unsigned long *arg, bool ovr) |
1da177e4 | 164 | { |
cee63723 | 165 | int err; |
9888faef | 166 | struct basic_head *head = rtnl_dereference(tp->root); |
add93b61 | 167 | struct nlattr *tb[TCA_BASIC_MAX + 1]; |
9888faef JF |
168 | struct basic_filter *fold = (struct basic_filter *) *arg; |
169 | struct basic_filter *fnew; | |
1da177e4 | 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 | 178 | |
9888faef JF |
179 | if (fold != NULL) { |
180 | if (handle && fold->handle != handle) | |
1da177e4 | 181 | return -EINVAL; |
1da177e4 LT |
182 | } |
183 | ||
9888faef | 184 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
bd42b788 JP |
185 | if (!fnew) |
186 | return -ENOBUFS; | |
1da177e4 | 187 | |
9888faef | 188 | tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
1da177e4 | 189 | err = -EINVAL; |
9888faef JF |
190 | if (handle) { |
191 | fnew->handle = handle; | |
192 | } else if (fold) { | |
193 | fnew->handle = fold->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 | ||
9888faef | 206 | fnew->handle = head->hgenerator; |
1da177e4 LT |
207 | } |
208 | ||
9888faef | 209 | err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr); |
1da177e4 LT |
210 | if (err < 0) |
211 | goto errout; | |
212 | ||
9888faef JF |
213 | *arg = (unsigned long)fnew; |
214 | ||
215 | if (fold) { | |
216 | list_replace_rcu(&fold->link, &fnew->link); | |
18cdb37e | 217 | tcf_unbind_filter(tp, &fold->res); |
9888faef JF |
218 | call_rcu(&fold->rcu, basic_delete_filter); |
219 | } else { | |
220 | list_add_rcu(&fnew->link, &head->flist); | |
221 | } | |
1da177e4 LT |
222 | |
223 | return 0; | |
224 | errout: | |
9888faef | 225 | kfree(fnew); |
1da177e4 LT |
226 | return err; |
227 | } | |
228 | ||
229 | static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
230 | { | |
9888faef | 231 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
232 | struct basic_filter *f; |
233 | ||
234 | list_for_each_entry(f, &head->flist, link) { | |
235 | if (arg->count < arg->skip) | |
236 | goto skip; | |
237 | ||
238 | if (arg->fn(tp, (unsigned long) f, arg) < 0) { | |
239 | arg->stop = 1; | |
240 | break; | |
241 | } | |
242 | skip: | |
243 | arg->count++; | |
244 | } | |
245 | } | |
246 | ||
832d1d5b | 247 | static int basic_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
248 | struct sk_buff *skb, struct tcmsg *t) |
249 | { | |
250 | struct basic_filter *f = (struct basic_filter *) fh; | |
4b3550ef | 251 | struct nlattr *nest; |
1da177e4 LT |
252 | |
253 | if (f == NULL) | |
254 | return skb->len; | |
255 | ||
256 | t->tcm_handle = f->handle; | |
257 | ||
4b3550ef PM |
258 | nest = nla_nest_start(skb, TCA_OPTIONS); |
259 | if (nest == NULL) | |
260 | goto nla_put_failure; | |
1da177e4 | 261 | |
1b34ec43 DM |
262 | if (f->res.classid && |
263 | nla_put_u32(skb, TCA_BASIC_CLASSID, f->res.classid)) | |
264 | goto nla_put_failure; | |
e1e284a4 | 265 | |
5da57f42 | 266 | if (tcf_exts_dump(skb, &f->exts) < 0 || |
1da177e4 | 267 | tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0) |
add93b61 | 268 | goto nla_put_failure; |
1da177e4 | 269 | |
4b3550ef | 270 | nla_nest_end(skb, nest); |
4c46ee52 | 271 | |
5da57f42 | 272 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
4c46ee52 | 273 | goto nla_put_failure; |
274 | ||
1da177e4 LT |
275 | return skb->len; |
276 | ||
add93b61 | 277 | nla_put_failure: |
4b3550ef | 278 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
279 | return -1; |
280 | } | |
281 | ||
2eb9d75c | 282 | static struct tcf_proto_ops cls_basic_ops __read_mostly = { |
1da177e4 LT |
283 | .kind = "basic", |
284 | .classify = basic_classify, | |
285 | .init = basic_init, | |
286 | .destroy = basic_destroy, | |
287 | .get = basic_get, | |
1da177e4 LT |
288 | .change = basic_change, |
289 | .delete = basic_delete, | |
290 | .walk = basic_walk, | |
291 | .dump = basic_dump, | |
292 | .owner = THIS_MODULE, | |
293 | }; | |
294 | ||
295 | static int __init init_basic(void) | |
296 | { | |
297 | return register_tcf_proto_ops(&cls_basic_ops); | |
298 | } | |
299 | ||
10297b99 | 300 | static void __exit exit_basic(void) |
1da177e4 LT |
301 | { |
302 | unregister_tcf_proto_ops(&cls_basic_ops); | |
303 | } | |
304 | ||
305 | module_init(init_basic) | |
306 | module_exit(exit_basic) | |
307 | MODULE_LICENSE("GPL"); | |
308 |