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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 | ||
49 | struct fw_head | |
50 | { | |
51 | struct fw_filter *ht[256]; | |
52 | }; | |
53 | ||
54 | struct fw_filter | |
55 | { | |
56 | struct fw_filter *next; | |
57 | u32 id; | |
58 | struct tcf_result res; | |
59 | #ifdef CONFIG_NET_CLS_IND | |
60 | char indev[IFNAMSIZ]; | |
61 | #endif /* CONFIG_NET_CLS_IND */ | |
62 | struct tcf_exts exts; | |
63 | }; | |
64 | ||
65 | static struct tcf_ext_map fw_ext_map = { | |
66 | .action = TCA_FW_ACT, | |
67 | .police = TCA_FW_POLICE | |
68 | }; | |
69 | ||
70 | static __inline__ int fw_hash(u32 handle) | |
71 | { | |
72 | return handle&0xFF; | |
73 | } | |
74 | ||
75 | static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp, | |
76 | struct tcf_result *res) | |
77 | { | |
78 | struct fw_head *head = (struct fw_head*)tp->root; | |
79 | struct fw_filter *f; | |
80 | int r; | |
81 | #ifdef CONFIG_NETFILTER | |
82 | u32 id = skb->nfmark; | |
83 | #else | |
84 | u32 id = 0; | |
85 | #endif | |
86 | ||
87 | if (head != NULL) { | |
88 | for (f=head->ht[fw_hash(id)]; f; f=f->next) { | |
89 | if (f->id == id) { | |
90 | *res = f->res; | |
91 | #ifdef CONFIG_NET_CLS_IND | |
92 | if (!tcf_match_indev(skb, f->indev)) | |
93 | continue; | |
94 | #endif /* CONFIG_NET_CLS_IND */ | |
95 | r = tcf_exts_exec(skb, &f->exts, res); | |
96 | if (r < 0) | |
97 | continue; | |
98 | ||
99 | return r; | |
100 | } | |
101 | } | |
102 | } else { | |
103 | /* old method */ | |
104 | if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) { | |
105 | res->classid = id; | |
106 | res->class = 0; | |
107 | return 0; | |
108 | } | |
109 | } | |
110 | ||
111 | return -1; | |
112 | } | |
113 | ||
114 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) | |
115 | { | |
116 | struct fw_head *head = (struct fw_head*)tp->root; | |
117 | struct fw_filter *f; | |
118 | ||
119 | if (head == NULL) | |
120 | return 0; | |
121 | ||
122 | for (f=head->ht[fw_hash(handle)]; f; f=f->next) { | |
123 | if (f->id == handle) | |
124 | return (unsigned long)f; | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static void fw_put(struct tcf_proto *tp, unsigned long f) | |
130 | { | |
131 | } | |
132 | ||
133 | static int fw_init(struct tcf_proto *tp) | |
134 | { | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static inline void | |
139 | fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f) | |
140 | { | |
141 | tcf_unbind_filter(tp, &f->res); | |
142 | tcf_exts_destroy(tp, &f->exts); | |
143 | kfree(f); | |
144 | } | |
145 | ||
146 | static void fw_destroy(struct tcf_proto *tp) | |
147 | { | |
148 | struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL); | |
149 | struct fw_filter *f; | |
150 | int h; | |
151 | ||
152 | if (head == NULL) | |
153 | return; | |
154 | ||
155 | for (h=0; h<256; h++) { | |
156 | while ((f=head->ht[h]) != NULL) { | |
157 | head->ht[h] = f->next; | |
158 | fw_delete_filter(tp, f); | |
159 | } | |
160 | } | |
161 | kfree(head); | |
162 | } | |
163 | ||
164 | static int fw_delete(struct tcf_proto *tp, unsigned long arg) | |
165 | { | |
166 | struct fw_head *head = (struct fw_head*)tp->root; | |
167 | struct fw_filter *f = (struct fw_filter*)arg; | |
168 | struct fw_filter **fp; | |
169 | ||
170 | if (head == NULL || f == NULL) | |
171 | goto out; | |
172 | ||
173 | for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) { | |
174 | if (*fp == f) { | |
175 | tcf_tree_lock(tp); | |
176 | *fp = f->next; | |
177 | tcf_tree_unlock(tp); | |
178 | fw_delete_filter(tp, f); | |
179 | return 0; | |
180 | } | |
181 | } | |
182 | out: | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | static int | |
187 | fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f, | |
188 | struct rtattr **tb, struct rtattr **tca, unsigned long base) | |
189 | { | |
190 | struct tcf_exts e; | |
191 | int err; | |
192 | ||
193 | err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map); | |
194 | if (err < 0) | |
195 | return err; | |
196 | ||
197 | err = -EINVAL; | |
198 | if (tb[TCA_FW_CLASSID-1]) { | |
199 | if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32)) | |
200 | goto errout; | |
201 | f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]); | |
202 | tcf_bind_filter(tp, &f->res, base); | |
203 | } | |
204 | ||
205 | #ifdef CONFIG_NET_CLS_IND | |
206 | if (tb[TCA_FW_INDEV-1]) { | |
207 | err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]); | |
208 | if (err < 0) | |
209 | goto errout; | |
210 | } | |
211 | #endif /* CONFIG_NET_CLS_IND */ | |
212 | ||
213 | tcf_exts_change(tp, &f->exts, &e); | |
214 | ||
215 | return 0; | |
216 | errout: | |
217 | tcf_exts_destroy(tp, &e); | |
218 | return err; | |
219 | } | |
220 | ||
221 | static int fw_change(struct tcf_proto *tp, unsigned long base, | |
222 | u32 handle, | |
223 | struct rtattr **tca, | |
224 | unsigned long *arg) | |
225 | { | |
226 | struct fw_head *head = (struct fw_head*)tp->root; | |
227 | struct fw_filter *f = (struct fw_filter *) *arg; | |
228 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
229 | struct rtattr *tb[TCA_FW_MAX]; | |
230 | int err; | |
231 | ||
232 | if (!opt) | |
233 | return handle ? -EINVAL : 0; | |
234 | ||
235 | if (rtattr_parse_nested(tb, TCA_FW_MAX, opt) < 0) | |
236 | return -EINVAL; | |
237 | ||
238 | if (f != NULL) { | |
239 | if (f->id != handle && handle) | |
240 | return -EINVAL; | |
241 | return fw_change_attrs(tp, f, tb, tca, base); | |
242 | } | |
243 | ||
244 | if (!handle) | |
245 | return -EINVAL; | |
246 | ||
247 | if (head == NULL) { | |
248 | head = kmalloc(sizeof(struct fw_head), GFP_KERNEL); | |
249 | if (head == NULL) | |
250 | return -ENOBUFS; | |
251 | memset(head, 0, sizeof(*head)); | |
252 | ||
253 | tcf_tree_lock(tp); | |
254 | tp->root = head; | |
255 | tcf_tree_unlock(tp); | |
256 | } | |
257 | ||
258 | f = kmalloc(sizeof(struct fw_filter), GFP_KERNEL); | |
259 | if (f == NULL) | |
260 | return -ENOBUFS; | |
261 | memset(f, 0, sizeof(*f)); | |
262 | ||
263 | f->id = handle; | |
264 | ||
265 | err = fw_change_attrs(tp, f, tb, tca, base); | |
266 | if (err < 0) | |
267 | goto errout; | |
268 | ||
269 | f->next = head->ht[fw_hash(handle)]; | |
270 | tcf_tree_lock(tp); | |
271 | head->ht[fw_hash(handle)] = f; | |
272 | tcf_tree_unlock(tp); | |
273 | ||
274 | *arg = (unsigned long)f; | |
275 | return 0; | |
276 | ||
277 | errout: | |
278 | if (f) | |
279 | kfree(f); | |
280 | return err; | |
281 | } | |
282 | ||
283 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
284 | { | |
285 | struct fw_head *head = (struct fw_head*)tp->root; | |
286 | int h; | |
287 | ||
288 | if (head == NULL) | |
289 | arg->stop = 1; | |
290 | ||
291 | if (arg->stop) | |
292 | return; | |
293 | ||
294 | for (h = 0; h < 256; h++) { | |
295 | struct fw_filter *f; | |
296 | ||
297 | for (f = head->ht[h]; f; f = f->next) { | |
298 | if (arg->count < arg->skip) { | |
299 | arg->count++; | |
300 | continue; | |
301 | } | |
302 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
303 | arg->stop = 1; | |
304 | return; | |
305 | } | |
306 | arg->count++; | |
307 | } | |
308 | } | |
309 | } | |
310 | ||
311 | static int fw_dump(struct tcf_proto *tp, unsigned long fh, | |
312 | struct sk_buff *skb, struct tcmsg *t) | |
313 | { | |
314 | struct fw_filter *f = (struct fw_filter*)fh; | |
315 | unsigned char *b = skb->tail; | |
316 | struct rtattr *rta; | |
317 | ||
318 | if (f == NULL) | |
319 | return skb->len; | |
320 | ||
321 | t->tcm_handle = f->id; | |
322 | ||
323 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
324 | return skb->len; | |
325 | ||
326 | rta = (struct rtattr*)b; | |
327 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
328 | ||
329 | if (f->res.classid) | |
330 | RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid); | |
331 | #ifdef CONFIG_NET_CLS_IND | |
332 | if (strlen(f->indev)) | |
333 | RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev); | |
334 | #endif /* CONFIG_NET_CLS_IND */ | |
335 | ||
336 | if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0) | |
337 | goto rtattr_failure; | |
338 | ||
339 | rta->rta_len = skb->tail - b; | |
340 | ||
341 | if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0) | |
342 | goto rtattr_failure; | |
343 | ||
344 | return skb->len; | |
345 | ||
346 | rtattr_failure: | |
347 | skb_trim(skb, b - skb->data); | |
348 | return -1; | |
349 | } | |
350 | ||
351 | static struct tcf_proto_ops cls_fw_ops = { | |
352 | .next = NULL, | |
353 | .kind = "fw", | |
354 | .classify = fw_classify, | |
355 | .init = fw_init, | |
356 | .destroy = fw_destroy, | |
357 | .get = fw_get, | |
358 | .put = fw_put, | |
359 | .change = fw_change, | |
360 | .delete = fw_delete, | |
361 | .walk = fw_walk, | |
362 | .dump = fw_dump, | |
363 | .owner = THIS_MODULE, | |
364 | }; | |
365 | ||
366 | static int __init init_fw(void) | |
367 | { | |
368 | return register_tcf_proto_ops(&cls_fw_ops); | |
369 | } | |
370 | ||
371 | static void __exit exit_fw(void) | |
372 | { | |
373 | unregister_tcf_proto_ops(&cls_fw_ops); | |
374 | } | |
375 | ||
376 | module_init(init_fw) | |
377 | module_exit(exit_fw) | |
378 | MODULE_LICENSE("GPL"); |