blob: 8adbd6a37d1475cbee48622b0cbbc230725be13e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/types.h>
23#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/skbuff.h>
Patrick McHardy0ba48052007-07-02 22:49:07 -070027#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <net/act_api.h>
29#include <net/pkt_cls.h>
30
Thomas Grafc5c13fa2005-04-24 20:19:54 -070031#define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033struct fw_head
34{
Thomas Grafc5c13fa2005-04-24 20:19:54 -070035 struct fw_filter *ht[HTSIZE];
Patrick McHardyb4e9b522006-08-25 16:11:42 -070036 u32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037};
38
39struct 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
50static struct tcf_ext_map fw_ext_map = {
51 .action = TCA_FW_ACT,
52 .police = TCA_FW_POLICE
53};
54
55static __inline__ int fw_hash(u32 handle)
56{
Thomas Grafc5c13fa2005-04-24 20:19:54 -070057 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];
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090077 } else
Thomas Grafc5c13fa2005-04-24 20:19:54 -070078 return handle & (HTSIZE - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079}
80
81static 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;
Patrick McHardy5c804bf2006-12-05 13:46:13 -080087 u32 id = skb->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89 if (head != NULL) {
Patrick McHardy5c804bf2006-12-05 13:46:13 -080090 id &= head->mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 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
117static 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
132static void fw_put(struct tcf_proto *tp, unsigned long f)
133{
134}
135
136static int fw_init(struct tcf_proto *tp)
137{
138 return 0;
139}
140
141static inline void
142fw_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
149static 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
Thomas Grafc5c13fa2005-04-24 20:19:54 -0700158 for (h=0; h<HTSIZE; h++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 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
167static 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 }
185out:
186 return -EINVAL;
187}
188
189static int
190fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
191 struct rtattr **tb, struct rtattr **tca, unsigned long base)
192{
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700193 struct fw_head *head = (struct fw_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 struct tcf_exts e;
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700195 u32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 int err;
197
198 err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map);
199 if (err < 0)
200 return err;
201
202 err = -EINVAL;
203 if (tb[TCA_FW_CLASSID-1]) {
204 if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32))
205 goto errout;
206 f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]);
207 tcf_bind_filter(tp, &f->res, base);
208 }
209
210#ifdef CONFIG_NET_CLS_IND
211 if (tb[TCA_FW_INDEV-1]) {
212 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]);
213 if (err < 0)
214 goto errout;
215 }
216#endif /* CONFIG_NET_CLS_IND */
217
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700218 if (tb[TCA_FW_MASK-1]) {
219 if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32))
220 goto errout;
221 mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]);
222 if (mask != head->mask)
223 goto errout;
224 } else if (head->mask != 0xFFFFFFFF)
225 goto errout;
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 tcf_exts_change(tp, &f->exts, &e);
228
229 return 0;
230errout:
231 tcf_exts_destroy(tp, &e);
232 return err;
233}
234
235static int fw_change(struct tcf_proto *tp, unsigned long base,
236 u32 handle,
237 struct rtattr **tca,
238 unsigned long *arg)
239{
240 struct fw_head *head = (struct fw_head*)tp->root;
241 struct fw_filter *f = (struct fw_filter *) *arg;
242 struct rtattr *opt = tca[TCA_OPTIONS-1];
243 struct rtattr *tb[TCA_FW_MAX];
244 int err;
245
246 if (!opt)
247 return handle ? -EINVAL : 0;
248
249 if (rtattr_parse_nested(tb, TCA_FW_MAX, opt) < 0)
250 return -EINVAL;
251
252 if (f != NULL) {
253 if (f->id != handle && handle)
254 return -EINVAL;
255 return fw_change_attrs(tp, f, tb, tca, base);
256 }
257
258 if (!handle)
259 return -EINVAL;
260
261 if (head == NULL) {
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700262 u32 mask = 0xFFFFFFFF;
263 if (tb[TCA_FW_MASK-1]) {
264 if (RTA_PAYLOAD(tb[TCA_FW_MASK-1]) != sizeof(u32))
265 return -EINVAL;
266 mask = *(u32*)RTA_DATA(tb[TCA_FW_MASK-1]);
267 }
268
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700269 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if (head == NULL)
271 return -ENOBUFS;
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700272 head->mask = mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 tcf_tree_lock(tp);
275 tp->root = head;
276 tcf_tree_unlock(tp);
277 }
278
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700279 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (f == NULL)
281 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
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
297errout:
Jesper Juhla51482b2005-11-08 09:41:34 -0800298 kfree(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return err;
300}
301
302static 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
Thomas Grafc5c13fa2005-04-24 20:19:54 -0700313 for (h = 0; h < HTSIZE; h++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 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
330static int fw_dump(struct tcf_proto *tp, unsigned long fh,
331 struct sk_buff *skb, struct tcmsg *t)
332{
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700333 struct fw_head *head = (struct fw_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 struct fw_filter *f = (struct fw_filter*)fh;
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700335 unsigned char *b = skb_tail_pointer(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 struct rtattr *rta;
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
346 rta = (struct rtattr*)b;
347 RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
348
349 if (f->res.classid)
350 RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid);
351#ifdef CONFIG_NET_CLS_IND
352 if (strlen(f->indev))
353 RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev);
354#endif /* CONFIG_NET_CLS_IND */
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700355 if (head->mask != 0xFFFFFFFF)
356 RTA_PUT(skb, TCA_FW_MASK, 4, &head->mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
359 goto rtattr_failure;
360
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700361 rta->rta_len = skb_tail_pointer(skb) - b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
364 goto rtattr_failure;
365
366 return skb->len;
367
368rtattr_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700369 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return -1;
371}
372
373static struct tcf_proto_ops cls_fw_ops = {
374 .next = NULL,
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
388static int __init init_fw(void)
389{
390 return register_tcf_proto_ops(&cls_fw_ops);
391}
392
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900393static void __exit exit_fw(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394{
395 unregister_tcf_proto_ops(&cls_fw_ops);
396}
397
398module_init(init_fw)
399module_exit(exit_fw)
400MODULE_LICENSE("GPL");