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 | ||
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 | ||
1da177e4 LT |
75 | static int basic_init(struct tcf_proto *tp) |
76 | { | |
d3fa76ee PM |
77 | struct basic_head *head; |
78 | ||
79 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
80 | if (head == NULL) | |
81 | return -ENOBUFS; | |
82 | INIT_LIST_HEAD(&head->flist); | |
9888faef | 83 | rcu_assign_pointer(tp->root, head); |
1da177e4 LT |
84 | return 0; |
85 | } | |
86 | ||
9888faef | 87 | static void basic_delete_filter(struct rcu_head *head) |
1da177e4 | 88 | { |
9888faef | 89 | struct basic_filter *f = container_of(head, struct basic_filter, rcu); |
9888faef | 90 | |
18d0264f | 91 | tcf_exts_destroy(&f->exts); |
82a470f1 | 92 | tcf_em_tree_destroy(&f->ematches); |
1da177e4 LT |
93 | kfree(f); |
94 | } | |
95 | ||
96 | static void basic_destroy(struct tcf_proto *tp) | |
97 | { | |
9888faef | 98 | struct basic_head *head = rtnl_dereference(tp->root); |
1da177e4 | 99 | struct basic_filter *f, *n; |
10297b99 | 100 | |
1da177e4 | 101 | list_for_each_entry_safe(f, n, &head->flist, link) { |
9888faef | 102 | list_del_rcu(&f->link); |
18cdb37e | 103 | tcf_unbind_filter(tp, &f->res); |
9888faef | 104 | call_rcu(&f->rcu, basic_delete_filter); |
1da177e4 | 105 | } |
9888faef JF |
106 | RCU_INIT_POINTER(tp->root, NULL); |
107 | kfree_rcu(head, rcu); | |
1da177e4 LT |
108 | } |
109 | ||
110 | static int basic_delete(struct tcf_proto *tp, unsigned long arg) | |
111 | { | |
e4386456 | 112 | struct basic_filter *f = (struct basic_filter *) arg; |
1da177e4 | 113 | |
e4386456 JP |
114 | list_del_rcu(&f->link); |
115 | tcf_unbind_filter(tp, &f->res); | |
116 | call_rcu(&f->rcu, basic_delete_filter); | |
117 | return 0; | |
1da177e4 LT |
118 | } |
119 | ||
6fa8c014 PM |
120 | static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = { |
121 | [TCA_BASIC_CLASSID] = { .type = NLA_U32 }, | |
122 | [TCA_BASIC_EMATCHES] = { .type = NLA_NESTED }, | |
123 | }; | |
124 | ||
c1b52739 BL |
125 | static int basic_set_parms(struct net *net, struct tcf_proto *tp, |
126 | struct basic_filter *f, unsigned long base, | |
127 | struct nlattr **tb, | |
2f7ef2f8 | 128 | struct nlattr *est, bool ovr) |
1da177e4 | 129 | { |
6459082a | 130 | int err; |
1da177e4 LT |
131 | struct tcf_exts e; |
132 | struct tcf_ematch_tree t; | |
133 | ||
5da57f42 | 134 | tcf_exts_init(&e, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
2f7ef2f8 | 135 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
136 | if (err < 0) |
137 | return err; | |
138 | ||
add93b61 | 139 | err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES], &t); |
1da177e4 LT |
140 | if (err < 0) |
141 | goto errout; | |
142 | ||
add93b61 | 143 | if (tb[TCA_BASIC_CLASSID]) { |
1587bac4 | 144 | f->res.classid = nla_get_u32(tb[TCA_BASIC_CLASSID]); |
1da177e4 LT |
145 | tcf_bind_filter(tp, &f->res, base); |
146 | } | |
147 | ||
148 | tcf_exts_change(tp, &f->exts, &e); | |
149 | tcf_em_tree_change(tp, &f->ematches, &t); | |
9888faef | 150 | f->tp = tp; |
1da177e4 LT |
151 | |
152 | return 0; | |
153 | errout: | |
18d0264f | 154 | tcf_exts_destroy(&e); |
1da177e4 LT |
155 | return err; |
156 | } | |
157 | ||
c1b52739 | 158 | static int basic_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 159 | struct tcf_proto *tp, unsigned long base, u32 handle, |
2f7ef2f8 | 160 | struct nlattr **tca, unsigned long *arg, bool ovr) |
1da177e4 | 161 | { |
cee63723 | 162 | int err; |
9888faef | 163 | struct basic_head *head = rtnl_dereference(tp->root); |
add93b61 | 164 | struct nlattr *tb[TCA_BASIC_MAX + 1]; |
9888faef JF |
165 | struct basic_filter *fold = (struct basic_filter *) *arg; |
166 | struct basic_filter *fnew; | |
1da177e4 | 167 | |
add93b61 | 168 | if (tca[TCA_OPTIONS] == NULL) |
1da177e4 LT |
169 | return -EINVAL; |
170 | ||
6fa8c014 PM |
171 | err = nla_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS], |
172 | basic_policy); | |
cee63723 PM |
173 | if (err < 0) |
174 | return err; | |
1da177e4 | 175 | |
9888faef JF |
176 | if (fold != NULL) { |
177 | if (handle && fold->handle != handle) | |
1da177e4 | 178 | return -EINVAL; |
1da177e4 LT |
179 | } |
180 | ||
9888faef | 181 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
bd42b788 JP |
182 | if (!fnew) |
183 | return -ENOBUFS; | |
1da177e4 | 184 | |
9888faef | 185 | tcf_exts_init(&fnew->exts, TCA_BASIC_ACT, TCA_BASIC_POLICE); |
1da177e4 | 186 | err = -EINVAL; |
9888faef JF |
187 | if (handle) { |
188 | fnew->handle = handle; | |
189 | } else if (fold) { | |
190 | fnew->handle = fold->handle; | |
191 | } else { | |
658270a0 | 192 | unsigned int i = 0x80000000; |
1da177e4 LT |
193 | do { |
194 | if (++head->hgenerator == 0x7FFFFFFF) | |
195 | head->hgenerator = 1; | |
196 | } while (--i > 0 && basic_get(tp, head->hgenerator)); | |
197 | ||
198 | if (i <= 0) { | |
cc7ec456 | 199 | pr_err("Insufficient number of handles\n"); |
1da177e4 LT |
200 | goto errout; |
201 | } | |
202 | ||
9888faef | 203 | fnew->handle = head->hgenerator; |
1da177e4 LT |
204 | } |
205 | ||
9888faef | 206 | err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr); |
1da177e4 LT |
207 | if (err < 0) |
208 | goto errout; | |
209 | ||
9888faef JF |
210 | *arg = (unsigned long)fnew; |
211 | ||
212 | if (fold) { | |
213 | list_replace_rcu(&fold->link, &fnew->link); | |
18cdb37e | 214 | tcf_unbind_filter(tp, &fold->res); |
9888faef JF |
215 | call_rcu(&fold->rcu, basic_delete_filter); |
216 | } else { | |
217 | list_add_rcu(&fnew->link, &head->flist); | |
218 | } | |
1da177e4 LT |
219 | |
220 | return 0; | |
221 | errout: | |
9888faef | 222 | kfree(fnew); |
1da177e4 LT |
223 | return err; |
224 | } | |
225 | ||
226 | static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
227 | { | |
9888faef | 228 | struct basic_head *head = rtnl_dereference(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, | |
1da177e4 LT |
285 | .change = basic_change, |
286 | .delete = basic_delete, | |
287 | .walk = basic_walk, | |
288 | .dump = basic_dump, | |
289 | .owner = THIS_MODULE, | |
290 | }; | |
291 | ||
292 | static int __init init_basic(void) | |
293 | { | |
294 | return register_tcf_proto_ops(&cls_basic_ops); | |
295 | } | |
296 | ||
10297b99 | 297 | static void __exit exit_basic(void) |
1da177e4 LT |
298 | { |
299 | unregister_tcf_proto_ops(&cls_basic_ops); | |
300 | } | |
301 | ||
302 | module_init(init_basic) | |
303 | module_exit(exit_basic) | |
304 | MODULE_LICENSE("GPL"); | |
305 |