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1da177e4 LT |
1 | /* |
2 | * net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class. | |
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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Changes: | |
12 | * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one | |
13 | * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel). | |
14 | * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension | |
15 | * | |
16 | * JHS: We should remove the CONFIG_NET_CLS_IND from here | |
17 | * eventually when the meta match extension is made available | |
18 | * | |
19 | */ | |
20 | ||
1da177e4 | 21 | #include <linux/module.h> |
1da177e4 LT |
22 | #include <linux/types.h> |
23 | #include <linux/kernel.h> | |
1da177e4 | 24 | #include <linux/string.h> |
1da177e4 | 25 | #include <linux/errno.h> |
1da177e4 | 26 | #include <linux/skbuff.h> |
0ba48053 | 27 | #include <net/netlink.h> |
1da177e4 LT |
28 | #include <net/act_api.h> |
29 | #include <net/pkt_cls.h> | |
30 | ||
c5c13faf TG |
31 | #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *)) |
32 | ||
1da177e4 LT |
33 | struct fw_head |
34 | { | |
c5c13faf | 35 | struct fw_filter *ht[HTSIZE]; |
b4e9b520 | 36 | u32 mask; |
1da177e4 LT |
37 | }; |
38 | ||
39 | struct fw_filter | |
40 | { | |
41 | struct fw_filter *next; | |
42 | u32 id; | |
43 | struct tcf_result res; | |
44 | #ifdef CONFIG_NET_CLS_IND | |
45 | char indev[IFNAMSIZ]; | |
46 | #endif /* CONFIG_NET_CLS_IND */ | |
47 | struct tcf_exts exts; | |
48 | }; | |
49 | ||
5239008b | 50 | static const struct tcf_ext_map fw_ext_map = { |
1da177e4 LT |
51 | .action = TCA_FW_ACT, |
52 | .police = TCA_FW_POLICE | |
53 | }; | |
54 | ||
55 | static __inline__ int fw_hash(u32 handle) | |
56 | { | |
c5c13faf TG |
57 | if (HTSIZE == 4096) |
58 | return ((handle >> 24) & 0xFFF) ^ | |
59 | ((handle >> 12) & 0xFFF) ^ | |
60 | (handle & 0xFFF); | |
61 | else if (HTSIZE == 2048) | |
62 | return ((handle >> 22) & 0x7FF) ^ | |
63 | ((handle >> 11) & 0x7FF) ^ | |
64 | (handle & 0x7FF); | |
65 | else if (HTSIZE == 1024) | |
66 | return ((handle >> 20) & 0x3FF) ^ | |
67 | ((handle >> 10) & 0x3FF) ^ | |
68 | (handle & 0x3FF); | |
69 | else if (HTSIZE == 512) | |
70 | return (handle >> 27) ^ | |
71 | ((handle >> 18) & 0x1FF) ^ | |
72 | ((handle >> 9) & 0x1FF) ^ | |
73 | (handle & 0x1FF); | |
74 | else if (HTSIZE == 256) { | |
75 | u8 *t = (u8 *) &handle; | |
76 | return t[0] ^ t[1] ^ t[2] ^ t[3]; | |
10297b99 | 77 | } else |
c5c13faf | 78 | return handle & (HTSIZE - 1); |
1da177e4 LT |
79 | } |
80 | ||
81 | static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp, | |
82 | struct tcf_result *res) | |
83 | { | |
84 | struct fw_head *head = (struct fw_head*)tp->root; | |
85 | struct fw_filter *f; | |
86 | int r; | |
5c804bfd | 87 | u32 id = skb->mark; |
1da177e4 LT |
88 | |
89 | if (head != NULL) { | |
5c804bfd | 90 | id &= head->mask; |
1da177e4 LT |
91 | for (f=head->ht[fw_hash(id)]; f; f=f->next) { |
92 | if (f->id == id) { | |
93 | *res = f->res; | |
94 | #ifdef CONFIG_NET_CLS_IND | |
95 | if (!tcf_match_indev(skb, f->indev)) | |
96 | continue; | |
97 | #endif /* CONFIG_NET_CLS_IND */ | |
98 | r = tcf_exts_exec(skb, &f->exts, res); | |
99 | if (r < 0) | |
100 | continue; | |
101 | ||
102 | return r; | |
103 | } | |
104 | } | |
105 | } else { | |
106 | /* old method */ | |
107 | if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) { | |
108 | res->classid = id; | |
109 | res->class = 0; | |
110 | return 0; | |
111 | } | |
112 | } | |
113 | ||
114 | return -1; | |
115 | } | |
116 | ||
117 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) | |
118 | { | |
119 | struct fw_head *head = (struct fw_head*)tp->root; | |
120 | struct fw_filter *f; | |
121 | ||
122 | if (head == NULL) | |
123 | return 0; | |
124 | ||
125 | for (f=head->ht[fw_hash(handle)]; f; f=f->next) { | |
126 | if (f->id == handle) | |
127 | return (unsigned long)f; | |
128 | } | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static void fw_put(struct tcf_proto *tp, unsigned long f) | |
133 | { | |
134 | } | |
135 | ||
136 | static int fw_init(struct tcf_proto *tp) | |
137 | { | |
138 | return 0; | |
139 | } | |
140 | ||
141 | static inline void | |
142 | fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f) | |
143 | { | |
144 | tcf_unbind_filter(tp, &f->res); | |
145 | tcf_exts_destroy(tp, &f->exts); | |
146 | kfree(f); | |
147 | } | |
148 | ||
149 | static void fw_destroy(struct tcf_proto *tp) | |
150 | { | |
151 | struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL); | |
152 | struct fw_filter *f; | |
153 | int h; | |
154 | ||
155 | if (head == NULL) | |
156 | return; | |
157 | ||
c5c13faf | 158 | for (h=0; h<HTSIZE; h++) { |
1da177e4 LT |
159 | while ((f=head->ht[h]) != NULL) { |
160 | head->ht[h] = f->next; | |
161 | fw_delete_filter(tp, f); | |
162 | } | |
163 | } | |
164 | kfree(head); | |
165 | } | |
166 | ||
167 | static int fw_delete(struct tcf_proto *tp, unsigned long arg) | |
168 | { | |
169 | struct fw_head *head = (struct fw_head*)tp->root; | |
170 | struct fw_filter *f = (struct fw_filter*)arg; | |
171 | struct fw_filter **fp; | |
172 | ||
173 | if (head == NULL || f == NULL) | |
174 | goto out; | |
175 | ||
176 | for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) { | |
177 | if (*fp == f) { | |
178 | tcf_tree_lock(tp); | |
179 | *fp = f->next; | |
180 | tcf_tree_unlock(tp); | |
181 | fw_delete_filter(tp, f); | |
182 | return 0; | |
183 | } | |
184 | } | |
185 | out: | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
6fa8c014 PM |
189 | static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = { |
190 | [TCA_FW_CLASSID] = { .type = NLA_U32 }, | |
191 | [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
192 | [TCA_FW_MASK] = { .type = NLA_U32 }, | |
193 | }; | |
194 | ||
1da177e4 LT |
195 | static int |
196 | fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f, | |
add93b61 | 197 | struct nlattr **tb, struct nlattr **tca, unsigned long base) |
1da177e4 | 198 | { |
b4e9b520 | 199 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 | 200 | struct tcf_exts e; |
b4e9b520 | 201 | u32 mask; |
1da177e4 LT |
202 | int err; |
203 | ||
add93b61 | 204 | err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &fw_ext_map); |
1da177e4 LT |
205 | if (err < 0) |
206 | return err; | |
207 | ||
208 | err = -EINVAL; | |
add93b61 | 209 | if (tb[TCA_FW_CLASSID]) { |
1587bac4 | 210 | f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); |
1da177e4 LT |
211 | tcf_bind_filter(tp, &f->res, base); |
212 | } | |
213 | ||
214 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 PM |
215 | if (tb[TCA_FW_INDEV]) { |
216 | err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]); | |
1da177e4 LT |
217 | if (err < 0) |
218 | goto errout; | |
219 | } | |
220 | #endif /* CONFIG_NET_CLS_IND */ | |
221 | ||
add93b61 | 222 | if (tb[TCA_FW_MASK]) { |
1587bac4 | 223 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 PM |
224 | if (mask != head->mask) |
225 | goto errout; | |
226 | } else if (head->mask != 0xFFFFFFFF) | |
227 | goto errout; | |
228 | ||
1da177e4 LT |
229 | tcf_exts_change(tp, &f->exts, &e); |
230 | ||
231 | return 0; | |
232 | errout: | |
233 | tcf_exts_destroy(tp, &e); | |
234 | return err; | |
235 | } | |
236 | ||
237 | static int fw_change(struct tcf_proto *tp, unsigned long base, | |
238 | u32 handle, | |
add93b61 | 239 | struct nlattr **tca, |
1da177e4 LT |
240 | unsigned long *arg) |
241 | { | |
242 | struct fw_head *head = (struct fw_head*)tp->root; | |
243 | struct fw_filter *f = (struct fw_filter *) *arg; | |
add93b61 PM |
244 | struct nlattr *opt = tca[TCA_OPTIONS]; |
245 | struct nlattr *tb[TCA_FW_MAX + 1]; | |
1da177e4 LT |
246 | int err; |
247 | ||
248 | if (!opt) | |
249 | return handle ? -EINVAL : 0; | |
250 | ||
6fa8c014 | 251 | err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy); |
cee63723 PM |
252 | if (err < 0) |
253 | return err; | |
1da177e4 LT |
254 | |
255 | if (f != NULL) { | |
256 | if (f->id != handle && handle) | |
257 | return -EINVAL; | |
258 | return fw_change_attrs(tp, f, tb, tca, base); | |
259 | } | |
260 | ||
261 | if (!handle) | |
262 | return -EINVAL; | |
263 | ||
264 | if (head == NULL) { | |
b4e9b520 | 265 | u32 mask = 0xFFFFFFFF; |
6fa8c014 | 266 | if (tb[TCA_FW_MASK]) |
1587bac4 | 267 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 | 268 | |
0da974f4 | 269 | head = kzalloc(sizeof(struct fw_head), GFP_KERNEL); |
1da177e4 LT |
270 | if (head == NULL) |
271 | return -ENOBUFS; | |
b4e9b520 | 272 | head->mask = mask; |
1da177e4 LT |
273 | |
274 | tcf_tree_lock(tp); | |
275 | tp->root = head; | |
276 | tcf_tree_unlock(tp); | |
277 | } | |
278 | ||
0da974f4 | 279 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
1da177e4 LT |
280 | if (f == NULL) |
281 | return -ENOBUFS; | |
1da177e4 LT |
282 | |
283 | f->id = handle; | |
284 | ||
285 | err = fw_change_attrs(tp, f, tb, tca, base); | |
286 | if (err < 0) | |
287 | goto errout; | |
288 | ||
289 | f->next = head->ht[fw_hash(handle)]; | |
290 | tcf_tree_lock(tp); | |
291 | head->ht[fw_hash(handle)] = f; | |
292 | tcf_tree_unlock(tp); | |
293 | ||
294 | *arg = (unsigned long)f; | |
295 | return 0; | |
296 | ||
297 | errout: | |
a51482bd | 298 | kfree(f); |
1da177e4 LT |
299 | return err; |
300 | } | |
301 | ||
302 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
303 | { | |
304 | struct fw_head *head = (struct fw_head*)tp->root; | |
305 | int h; | |
306 | ||
307 | if (head == NULL) | |
308 | arg->stop = 1; | |
309 | ||
310 | if (arg->stop) | |
311 | return; | |
312 | ||
c5c13faf | 313 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
314 | struct fw_filter *f; |
315 | ||
316 | for (f = head->ht[h]; f; f = f->next) { | |
317 | if (arg->count < arg->skip) { | |
318 | arg->count++; | |
319 | continue; | |
320 | } | |
321 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
322 | arg->stop = 1; | |
323 | return; | |
324 | } | |
325 | arg->count++; | |
326 | } | |
327 | } | |
328 | } | |
329 | ||
330 | static int fw_dump(struct tcf_proto *tp, unsigned long fh, | |
331 | struct sk_buff *skb, struct tcmsg *t) | |
332 | { | |
b4e9b520 | 333 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 | 334 | struct fw_filter *f = (struct fw_filter*)fh; |
27a884dc | 335 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 336 | struct nlattr *nest; |
1da177e4 LT |
337 | |
338 | if (f == NULL) | |
339 | return skb->len; | |
340 | ||
341 | t->tcm_handle = f->id; | |
342 | ||
343 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
344 | return skb->len; | |
345 | ||
4b3550ef PM |
346 | nest = nla_nest_start(skb, TCA_OPTIONS); |
347 | if (nest == NULL) | |
348 | goto nla_put_failure; | |
1da177e4 LT |
349 | |
350 | if (f->res.classid) | |
24beeab5 | 351 | NLA_PUT_U32(skb, TCA_FW_CLASSID, f->res.classid); |
1da177e4 LT |
352 | #ifdef CONFIG_NET_CLS_IND |
353 | if (strlen(f->indev)) | |
57e1c487 | 354 | NLA_PUT_STRING(skb, TCA_FW_INDEV, f->indev); |
1da177e4 | 355 | #endif /* CONFIG_NET_CLS_IND */ |
b4e9b520 | 356 | if (head->mask != 0xFFFFFFFF) |
24beeab5 | 357 | NLA_PUT_U32(skb, TCA_FW_MASK, head->mask); |
1da177e4 LT |
358 | |
359 | if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0) | |
add93b61 | 360 | goto nla_put_failure; |
1da177e4 | 361 | |
4b3550ef | 362 | nla_nest_end(skb, nest); |
1da177e4 LT |
363 | |
364 | if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0) | |
add93b61 | 365 | goto nla_put_failure; |
1da177e4 LT |
366 | |
367 | return skb->len; | |
368 | ||
add93b61 | 369 | nla_put_failure: |
dc5fc579 | 370 | nlmsg_trim(skb, b); |
1da177e4 LT |
371 | return -1; |
372 | } | |
373 | ||
2eb9d75c | 374 | static struct tcf_proto_ops cls_fw_ops __read_mostly = { |
1da177e4 LT |
375 | .kind = "fw", |
376 | .classify = fw_classify, | |
377 | .init = fw_init, | |
378 | .destroy = fw_destroy, | |
379 | .get = fw_get, | |
380 | .put = fw_put, | |
381 | .change = fw_change, | |
382 | .delete = fw_delete, | |
383 | .walk = fw_walk, | |
384 | .dump = fw_dump, | |
385 | .owner = THIS_MODULE, | |
386 | }; | |
387 | ||
388 | static int __init init_fw(void) | |
389 | { | |
390 | return register_tcf_proto_ops(&cls_fw_ops); | |
391 | } | |
392 | ||
10297b99 | 393 | static void __exit exit_fw(void) |
1da177e4 LT |
394 | { |
395 | unregister_tcf_proto_ops(&cls_fw_ops); | |
396 | } | |
397 | ||
398 | module_init(init_fw) | |
399 | module_exit(exit_fw) | |
400 | MODULE_LICENSE("GPL"); |