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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 LT |
21 | #include <linux/module.h> |
22 | #include <asm/uaccess.h> | |
23 | #include <asm/system.h> | |
24 | #include <linux/bitops.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/in.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/if_ether.h> | |
36 | #include <linux/inet.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/etherdevice.h> | |
39 | #include <linux/notifier.h> | |
40 | #include <linux/netfilter.h> | |
41 | #include <net/ip.h> | |
42 | #include <net/route.h> | |
43 | #include <linux/skbuff.h> | |
44 | #include <net/sock.h> | |
45 | #include <net/act_api.h> | |
46 | #include <net/pkt_cls.h> | |
47 | ||
c5c13faf TG |
48 | #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *)) |
49 | ||
1da177e4 LT |
50 | struct fw_head |
51 | { | |
c5c13faf | 52 | struct fw_filter *ht[HTSIZE]; |
b4e9b520 | 53 | u32 mask; |
1da177e4 LT |
54 | }; |
55 | ||
56 | struct fw_filter | |
57 | { | |
58 | struct fw_filter *next; | |
59 | u32 id; | |
60 | struct tcf_result res; | |
61 | #ifdef CONFIG_NET_CLS_IND | |
62 | char indev[IFNAMSIZ]; | |
63 | #endif /* CONFIG_NET_CLS_IND */ | |
64 | struct tcf_exts exts; | |
65 | }; | |
66 | ||
67 | static struct tcf_ext_map fw_ext_map = { | |
68 | .action = TCA_FW_ACT, | |
69 | .police = TCA_FW_POLICE | |
70 | }; | |
71 | ||
72 | static __inline__ int fw_hash(u32 handle) | |
73 | { | |
c5c13faf TG |
74 | if (HTSIZE == 4096) |
75 | return ((handle >> 24) & 0xFFF) ^ | |
76 | ((handle >> 12) & 0xFFF) ^ | |
77 | (handle & 0xFFF); | |
78 | else if (HTSIZE == 2048) | |
79 | return ((handle >> 22) & 0x7FF) ^ | |
80 | ((handle >> 11) & 0x7FF) ^ | |
81 | (handle & 0x7FF); | |
82 | else if (HTSIZE == 1024) | |
83 | return ((handle >> 20) & 0x3FF) ^ | |
84 | ((handle >> 10) & 0x3FF) ^ | |
85 | (handle & 0x3FF); | |
86 | else if (HTSIZE == 512) | |
87 | return (handle >> 27) ^ | |
88 | ((handle >> 18) & 0x1FF) ^ | |
89 | ((handle >> 9) & 0x1FF) ^ | |
90 | (handle & 0x1FF); | |
91 | else if (HTSIZE == 256) { | |
92 | u8 *t = (u8 *) &handle; | |
93 | return t[0] ^ t[1] ^ t[2] ^ t[3]; | |
94 | } else | |
95 | return handle & (HTSIZE - 1); | |
1da177e4 LT |
96 | } |
97 | ||
98 | static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp, | |
99 | struct tcf_result *res) | |
100 | { | |
101 | struct fw_head *head = (struct fw_head*)tp->root; | |
102 | struct fw_filter *f; | |
103 | int r; | |
104 | #ifdef CONFIG_NETFILTER | |
b4e9b520 | 105 | u32 id = skb->nfmark & head->mask; |
1da177e4 LT |
106 | #else |
107 | u32 id = 0; | |
108 | #endif | |
109 | ||
110 | if (head != NULL) { | |
111 | for (f=head->ht[fw_hash(id)]; f; f=f->next) { | |
112 | if (f->id == id) { | |
113 | *res = f->res; | |
114 | #ifdef CONFIG_NET_CLS_IND | |
115 | if (!tcf_match_indev(skb, f->indev)) | |
116 | continue; | |
117 | #endif /* CONFIG_NET_CLS_IND */ | |
118 | r = tcf_exts_exec(skb, &f->exts, res); | |
119 | if (r < 0) | |
120 | continue; | |
121 | ||
122 | return r; | |
123 | } | |
124 | } | |
125 | } else { | |
126 | /* old method */ | |
127 | if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) { | |
128 | res->classid = id; | |
129 | res->class = 0; | |
130 | return 0; | |
131 | } | |
132 | } | |
133 | ||
134 | return -1; | |
135 | } | |
136 | ||
137 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) | |
138 | { | |
139 | struct fw_head *head = (struct fw_head*)tp->root; | |
140 | struct fw_filter *f; | |
141 | ||
142 | if (head == NULL) | |
143 | return 0; | |
144 | ||
145 | for (f=head->ht[fw_hash(handle)]; f; f=f->next) { | |
146 | if (f->id == handle) | |
147 | return (unsigned long)f; | |
148 | } | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static void fw_put(struct tcf_proto *tp, unsigned long f) | |
153 | { | |
154 | } | |
155 | ||
156 | static int fw_init(struct tcf_proto *tp) | |
157 | { | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static inline void | |
162 | fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f) | |
163 | { | |
164 | tcf_unbind_filter(tp, &f->res); | |
165 | tcf_exts_destroy(tp, &f->exts); | |
166 | kfree(f); | |
167 | } | |
168 | ||
169 | static void fw_destroy(struct tcf_proto *tp) | |
170 | { | |
171 | struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL); | |
172 | struct fw_filter *f; | |
173 | int h; | |
174 | ||
175 | if (head == NULL) | |
176 | return; | |
177 | ||
c5c13faf | 178 | for (h=0; h<HTSIZE; h++) { |
1da177e4 LT |
179 | while ((f=head->ht[h]) != NULL) { |
180 | head->ht[h] = f->next; | |
181 | fw_delete_filter(tp, f); | |
182 | } | |
183 | } | |
184 | kfree(head); | |
185 | } | |
186 | ||
187 | static int fw_delete(struct tcf_proto *tp, unsigned long arg) | |
188 | { | |
189 | struct fw_head *head = (struct fw_head*)tp->root; | |
190 | struct fw_filter *f = (struct fw_filter*)arg; | |
191 | struct fw_filter **fp; | |
192 | ||
193 | if (head == NULL || f == NULL) | |
194 | goto out; | |
195 | ||
196 | for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) { | |
197 | if (*fp == f) { | |
198 | tcf_tree_lock(tp); | |
199 | *fp = f->next; | |
200 | tcf_tree_unlock(tp); | |
201 | fw_delete_filter(tp, f); | |
202 | return 0; | |
203 | } | |
204 | } | |
205 | out: | |
206 | return -EINVAL; | |
207 | } | |
208 | ||
209 | static int | |
210 | fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f, | |
211 | struct rtattr **tb, struct rtattr **tca, unsigned long base) | |
212 | { | |
b4e9b520 | 213 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 | 214 | struct tcf_exts e; |
b4e9b520 | 215 | u32 mask; |
1da177e4 LT |
216 | int err; |
217 | ||
218 | err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map); | |
219 | if (err < 0) | |
220 | return err; | |
221 | ||
222 | err = -EINVAL; | |
223 | if (tb[TCA_FW_CLASSID-1]) { | |
224 | if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32)) | |
225 | goto errout; | |
226 | f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]); | |
227 | tcf_bind_filter(tp, &f->res, base); | |
228 | } | |
229 | ||
230 | #ifdef CONFIG_NET_CLS_IND | |
231 | if (tb[TCA_FW_INDEV-1]) { | |
232 | err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]); | |
233 | if (err < 0) | |
234 | goto errout; | |
235 | } | |
236 | #endif /* CONFIG_NET_CLS_IND */ | |
237 | ||
b4e9b520 PM |
238 | if (tb[TCA_FW_MASK-1]) { |
239 | if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32)) | |
240 | goto errout; | |
241 | mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]); | |
242 | if (mask != head->mask) | |
243 | goto errout; | |
244 | } else if (head->mask != 0xFFFFFFFF) | |
245 | goto errout; | |
246 | ||
1da177e4 LT |
247 | tcf_exts_change(tp, &f->exts, &e); |
248 | ||
249 | return 0; | |
250 | errout: | |
251 | tcf_exts_destroy(tp, &e); | |
252 | return err; | |
253 | } | |
254 | ||
255 | static int fw_change(struct tcf_proto *tp, unsigned long base, | |
256 | u32 handle, | |
257 | struct rtattr **tca, | |
258 | unsigned long *arg) | |
259 | { | |
260 | struct fw_head *head = (struct fw_head*)tp->root; | |
261 | struct fw_filter *f = (struct fw_filter *) *arg; | |
262 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
263 | struct rtattr *tb[TCA_FW_MAX]; | |
264 | int err; | |
265 | ||
266 | if (!opt) | |
267 | return handle ? -EINVAL : 0; | |
268 | ||
269 | if (rtattr_parse_nested(tb, TCA_FW_MAX, opt) < 0) | |
270 | return -EINVAL; | |
271 | ||
272 | if (f != NULL) { | |
273 | if (f->id != handle && handle) | |
274 | return -EINVAL; | |
275 | return fw_change_attrs(tp, f, tb, tca, base); | |
276 | } | |
277 | ||
278 | if (!handle) | |
279 | return -EINVAL; | |
280 | ||
281 | if (head == NULL) { | |
b4e9b520 PM |
282 | u32 mask = 0xFFFFFFFF; |
283 | if (tb[TCA_FW_MASK-1]) { | |
284 | if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32)) | |
285 | return -EINVAL; | |
286 | mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]); | |
287 | } | |
288 | ||
0da974f4 | 289 | head = kzalloc(sizeof(struct fw_head), GFP_KERNEL); |
1da177e4 LT |
290 | if (head == NULL) |
291 | return -ENOBUFS; | |
b4e9b520 | 292 | head->mask = mask; |
1da177e4 LT |
293 | |
294 | tcf_tree_lock(tp); | |
295 | tp->root = head; | |
296 | tcf_tree_unlock(tp); | |
297 | } | |
298 | ||
0da974f4 | 299 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
1da177e4 LT |
300 | if (f == NULL) |
301 | return -ENOBUFS; | |
1da177e4 LT |
302 | |
303 | f->id = handle; | |
304 | ||
305 | err = fw_change_attrs(tp, f, tb, tca, base); | |
306 | if (err < 0) | |
307 | goto errout; | |
308 | ||
309 | f->next = head->ht[fw_hash(handle)]; | |
310 | tcf_tree_lock(tp); | |
311 | head->ht[fw_hash(handle)] = f; | |
312 | tcf_tree_unlock(tp); | |
313 | ||
314 | *arg = (unsigned long)f; | |
315 | return 0; | |
316 | ||
317 | errout: | |
a51482bd | 318 | kfree(f); |
1da177e4 LT |
319 | return err; |
320 | } | |
321 | ||
322 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
323 | { | |
324 | struct fw_head *head = (struct fw_head*)tp->root; | |
325 | int h; | |
326 | ||
327 | if (head == NULL) | |
328 | arg->stop = 1; | |
329 | ||
330 | if (arg->stop) | |
331 | return; | |
332 | ||
c5c13faf | 333 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
334 | struct fw_filter *f; |
335 | ||
336 | for (f = head->ht[h]; f; f = f->next) { | |
337 | if (arg->count < arg->skip) { | |
338 | arg->count++; | |
339 | continue; | |
340 | } | |
341 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
342 | arg->stop = 1; | |
343 | return; | |
344 | } | |
345 | arg->count++; | |
346 | } | |
347 | } | |
348 | } | |
349 | ||
350 | static int fw_dump(struct tcf_proto *tp, unsigned long fh, | |
351 | struct sk_buff *skb, struct tcmsg *t) | |
352 | { | |
b4e9b520 | 353 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 LT |
354 | struct fw_filter *f = (struct fw_filter*)fh; |
355 | unsigned char *b = skb->tail; | |
356 | struct rtattr *rta; | |
357 | ||
358 | if (f == NULL) | |
359 | return skb->len; | |
360 | ||
361 | t->tcm_handle = f->id; | |
362 | ||
363 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
364 | return skb->len; | |
365 | ||
366 | rta = (struct rtattr*)b; | |
367 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
368 | ||
369 | if (f->res.classid) | |
370 | RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid); | |
371 | #ifdef CONFIG_NET_CLS_IND | |
372 | if (strlen(f->indev)) | |
373 | RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev); | |
374 | #endif /* CONFIG_NET_CLS_IND */ | |
b4e9b520 PM |
375 | if (head->mask != 0xFFFFFFFF) |
376 | RTA_PUT(skb, TCA_FW_MASK, 4, &head->mask); | |
1da177e4 LT |
377 | |
378 | if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0) | |
379 | goto rtattr_failure; | |
380 | ||
381 | rta->rta_len = skb->tail - b; | |
382 | ||
383 | if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0) | |
384 | goto rtattr_failure; | |
385 | ||
386 | return skb->len; | |
387 | ||
388 | rtattr_failure: | |
389 | skb_trim(skb, b - skb->data); | |
390 | return -1; | |
391 | } | |
392 | ||
393 | static struct tcf_proto_ops cls_fw_ops = { | |
394 | .next = NULL, | |
395 | .kind = "fw", | |
396 | .classify = fw_classify, | |
397 | .init = fw_init, | |
398 | .destroy = fw_destroy, | |
399 | .get = fw_get, | |
400 | .put = fw_put, | |
401 | .change = fw_change, | |
402 | .delete = fw_delete, | |
403 | .walk = fw_walk, | |
404 | .dump = fw_dump, | |
405 | .owner = THIS_MODULE, | |
406 | }; | |
407 | ||
408 | static int __init init_fw(void) | |
409 | { | |
410 | return register_tcf_proto_ops(&cls_fw_ops); | |
411 | } | |
412 | ||
413 | static void __exit exit_fw(void) | |
414 | { | |
415 | unregister_tcf_proto_ops(&cls_fw_ops); | |
416 | } | |
417 | ||
418 | module_init(init_fw) | |
419 | module_exit(exit_fw) | |
420 | MODULE_LICENSE("GPL"); |