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