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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 | ||
21 | #include <linux/config.h> | |
22 | #include <linux/module.h> | |
23 | #include <asm/uaccess.h> | |
24 | #include <asm/system.h> | |
25 | #include <linux/bitops.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/in.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/if_ether.h> | |
37 | #include <linux/inet.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/etherdevice.h> | |
40 | #include <linux/notifier.h> | |
41 | #include <linux/netfilter.h> | |
42 | #include <net/ip.h> | |
43 | #include <net/route.h> | |
44 | #include <linux/skbuff.h> | |
45 | #include <net/sock.h> | |
46 | #include <net/act_api.h> | |
47 | #include <net/pkt_cls.h> | |
48 | ||
c5c13faf TG |
49 | #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *)) |
50 | ||
1da177e4 LT |
51 | struct fw_head |
52 | { | |
c5c13faf | 53 | struct fw_filter *ht[HTSIZE]; |
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 | |
105 | u32 id = skb->nfmark; | |
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 | { | |
213 | struct tcf_exts e; | |
214 | int err; | |
215 | ||
216 | err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map); | |
217 | if (err < 0) | |
218 | return err; | |
219 | ||
220 | err = -EINVAL; | |
221 | if (tb[TCA_FW_CLASSID-1]) { | |
222 | if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32)) | |
223 | goto errout; | |
224 | f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]); | |
225 | tcf_bind_filter(tp, &f->res, base); | |
226 | } | |
227 | ||
228 | #ifdef CONFIG_NET_CLS_IND | |
229 | if (tb[TCA_FW_INDEV-1]) { | |
230 | err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]); | |
231 | if (err < 0) | |
232 | goto errout; | |
233 | } | |
234 | #endif /* CONFIG_NET_CLS_IND */ | |
235 | ||
236 | tcf_exts_change(tp, &f->exts, &e); | |
237 | ||
238 | return 0; | |
239 | errout: | |
240 | tcf_exts_destroy(tp, &e); | |
241 | return err; | |
242 | } | |
243 | ||
244 | static int fw_change(struct tcf_proto *tp, unsigned long base, | |
245 | u32 handle, | |
246 | struct rtattr **tca, | |
247 | unsigned long *arg) | |
248 | { | |
249 | struct fw_head *head = (struct fw_head*)tp->root; | |
250 | struct fw_filter *f = (struct fw_filter *) *arg; | |
251 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
252 | struct rtattr *tb[TCA_FW_MAX]; | |
253 | int err; | |
254 | ||
255 | if (!opt) | |
256 | return handle ? -EINVAL : 0; | |
257 | ||
258 | if (rtattr_parse_nested(tb, TCA_FW_MAX, opt) < 0) | |
259 | return -EINVAL; | |
260 | ||
261 | if (f != NULL) { | |
262 | if (f->id != handle && handle) | |
263 | return -EINVAL; | |
264 | return fw_change_attrs(tp, f, tb, tca, base); | |
265 | } | |
266 | ||
267 | if (!handle) | |
268 | return -EINVAL; | |
269 | ||
270 | if (head == NULL) { | |
271 | head = kmalloc(sizeof(struct fw_head), GFP_KERNEL); | |
272 | if (head == NULL) | |
273 | return -ENOBUFS; | |
274 | memset(head, 0, sizeof(*head)); | |
275 | ||
276 | tcf_tree_lock(tp); | |
277 | tp->root = head; | |
278 | tcf_tree_unlock(tp); | |
279 | } | |
280 | ||
281 | f = kmalloc(sizeof(struct fw_filter), GFP_KERNEL); | |
282 | if (f == NULL) | |
283 | return -ENOBUFS; | |
284 | memset(f, 0, sizeof(*f)); | |
285 | ||
286 | f->id = handle; | |
287 | ||
288 | err = fw_change_attrs(tp, f, tb, tca, base); | |
289 | if (err < 0) | |
290 | goto errout; | |
291 | ||
292 | f->next = head->ht[fw_hash(handle)]; | |
293 | tcf_tree_lock(tp); | |
294 | head->ht[fw_hash(handle)] = f; | |
295 | tcf_tree_unlock(tp); | |
296 | ||
297 | *arg = (unsigned long)f; | |
298 | return 0; | |
299 | ||
300 | errout: | |
301 | if (f) | |
302 | kfree(f); | |
303 | return err; | |
304 | } | |
305 | ||
306 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
307 | { | |
308 | struct fw_head *head = (struct fw_head*)tp->root; | |
309 | int h; | |
310 | ||
311 | if (head == NULL) | |
312 | arg->stop = 1; | |
313 | ||
314 | if (arg->stop) | |
315 | return; | |
316 | ||
c5c13faf | 317 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
318 | struct fw_filter *f; |
319 | ||
320 | for (f = head->ht[h]; f; f = f->next) { | |
321 | if (arg->count < arg->skip) { | |
322 | arg->count++; | |
323 | continue; | |
324 | } | |
325 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
326 | arg->stop = 1; | |
327 | return; | |
328 | } | |
329 | arg->count++; | |
330 | } | |
331 | } | |
332 | } | |
333 | ||
334 | static int fw_dump(struct tcf_proto *tp, unsigned long fh, | |
335 | struct sk_buff *skb, struct tcmsg *t) | |
336 | { | |
337 | struct fw_filter *f = (struct fw_filter*)fh; | |
338 | unsigned char *b = skb->tail; | |
339 | struct rtattr *rta; | |
340 | ||
341 | if (f == NULL) | |
342 | return skb->len; | |
343 | ||
344 | t->tcm_handle = f->id; | |
345 | ||
346 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
347 | return skb->len; | |
348 | ||
349 | rta = (struct rtattr*)b; | |
350 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
351 | ||
352 | if (f->res.classid) | |
353 | RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid); | |
354 | #ifdef CONFIG_NET_CLS_IND | |
355 | if (strlen(f->indev)) | |
356 | RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev); | |
357 | #endif /* CONFIG_NET_CLS_IND */ | |
358 | ||
359 | if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0) | |
360 | goto rtattr_failure; | |
361 | ||
362 | rta->rta_len = skb->tail - b; | |
363 | ||
364 | if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0) | |
365 | goto rtattr_failure; | |
366 | ||
367 | return skb->len; | |
368 | ||
369 | rtattr_failure: | |
370 | skb_trim(skb, b - skb->data); | |
371 | return -1; | |
372 | } | |
373 | ||
374 | static struct tcf_proto_ops cls_fw_ops = { | |
375 | .next = NULL, | |
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"); |