bluetooth: hid: make Android code conditional
[linux-2.6.git] / net / sched / cls_fw.c
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         struct fw_filter *ht[HTSIZE];
36         u32 mask;
37 };
38
39 struct fw_filter {
40         struct fw_filter        *next;
41         u32                     id;
42         struct tcf_result       res;
43 #ifdef CONFIG_NET_CLS_IND
44         char                    indev[IFNAMSIZ];
45 #endif /* CONFIG_NET_CLS_IND */
46         struct tcf_exts         exts;
47 };
48
49 static const struct tcf_ext_map fw_ext_map = {
50         .action = TCA_FW_ACT,
51         .police = TCA_FW_POLICE
52 };
53
54 static inline int fw_hash(u32 handle)
55 {
56         if (HTSIZE == 4096)
57                 return ((handle >> 24) & 0xFFF) ^
58                        ((handle >> 12) & 0xFFF) ^
59                        (handle & 0xFFF);
60         else if (HTSIZE == 2048)
61                 return ((handle >> 22) & 0x7FF) ^
62                        ((handle >> 11) & 0x7FF) ^
63                        (handle & 0x7FF);
64         else if (HTSIZE == 1024)
65                 return ((handle >> 20) & 0x3FF) ^
66                        ((handle >> 10) & 0x3FF) ^
67                        (handle & 0x3FF);
68         else if (HTSIZE == 512)
69                 return (handle >> 27) ^
70                        ((handle >> 18) & 0x1FF) ^
71                        ((handle >> 9) & 0x1FF) ^
72                        (handle & 0x1FF);
73         else if (HTSIZE == 256) {
74                 u8 *t = (u8 *) &handle;
75                 return t[0] ^ t[1] ^ t[2] ^ t[3];
76         } else
77                 return handle & (HTSIZE - 1);
78 }
79
80 static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
81                           struct tcf_result *res)
82 {
83         struct fw_head *head = (struct fw_head *)tp->root;
84         struct fw_filter *f;
85         int r;
86         u32 id = skb->mark;
87
88         if (head != NULL) {
89                 id &= head->mask;
90                 for (f = head->ht[fw_hash(id)]; f; f = f->next) {
91                         if (f->id == id) {
92                                 *res = f->res;
93 #ifdef CONFIG_NET_CLS_IND
94                                 if (!tcf_match_indev(skb, f->indev))
95                                         continue;
96 #endif /* CONFIG_NET_CLS_IND */
97                                 r = tcf_exts_exec(skb, &f->exts, res);
98                                 if (r < 0)
99                                         continue;
100
101                                 return r;
102                         }
103                 }
104         } else {
105                 /* old method */
106                 if (id && (TC_H_MAJ(id) == 0 ||
107                            !(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
117 static 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
132 static void fw_put(struct tcf_proto *tp, unsigned long f)
133 {
134 }
135
136 static int fw_init(struct tcf_proto *tp)
137 {
138         return 0;
139 }
140
141 static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
142 {
143         tcf_unbind_filter(tp, &f->res);
144         tcf_exts_destroy(tp, &f->exts);
145         kfree(f);
146 }
147
148 static void fw_destroy(struct tcf_proto *tp)
149 {
150         struct fw_head *head = tp->root;
151         struct fw_filter *f;
152         int h;
153
154         if (head == NULL)
155                 return;
156
157         for (h = 0; h < HTSIZE; h++) {
158                 while ((f = head->ht[h]) != NULL) {
159                         head->ht[h] = f->next;
160                         fw_delete_filter(tp, f);
161                 }
162         }
163         kfree(head);
164 }
165
166 static int fw_delete(struct tcf_proto *tp, unsigned long arg)
167 {
168         struct fw_head *head = (struct fw_head *)tp->root;
169         struct fw_filter *f = (struct fw_filter *)arg;
170         struct fw_filter **fp;
171
172         if (head == NULL || f == NULL)
173                 goto out;
174
175         for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
176                 if (*fp == f) {
177                         tcf_tree_lock(tp);
178                         *fp = f->next;
179                         tcf_tree_unlock(tp);
180                         fw_delete_filter(tp, f);
181                         return 0;
182                 }
183         }
184 out:
185         return -EINVAL;
186 }
187
188 static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
189         [TCA_FW_CLASSID]        = { .type = NLA_U32 },
190         [TCA_FW_INDEV]          = { .type = NLA_STRING, .len = IFNAMSIZ },
191         [TCA_FW_MASK]           = { .type = NLA_U32 },
192 };
193
194 static int
195 fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
196         struct nlattr **tb, struct nlattr **tca, unsigned long base)
197 {
198         struct fw_head *head = (struct fw_head *)tp->root;
199         struct tcf_exts e;
200         u32 mask;
201         int err;
202
203         err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
204         if (err < 0)
205                 return err;
206
207         err = -EINVAL;
208         if (tb[TCA_FW_CLASSID]) {
209                 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
210                 tcf_bind_filter(tp, &f->res, base);
211         }
212
213 #ifdef CONFIG_NET_CLS_IND
214         if (tb[TCA_FW_INDEV]) {
215                 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
216                 if (err < 0)
217                         goto errout;
218         }
219 #endif /* CONFIG_NET_CLS_IND */
220
221         if (tb[TCA_FW_MASK]) {
222                 mask = nla_get_u32(tb[TCA_FW_MASK]);
223                 if (mask != head->mask)
224                         goto errout;
225         } else if (head->mask != 0xFFFFFFFF)
226                 goto errout;
227
228         tcf_exts_change(tp, &f->exts, &e);
229
230         return 0;
231 errout:
232         tcf_exts_destroy(tp, &e);
233         return err;
234 }
235
236 static int fw_change(struct tcf_proto *tp, unsigned long base,
237                      u32 handle,
238                      struct nlattr **tca,
239                      unsigned long *arg)
240 {
241         struct fw_head *head = (struct fw_head *)tp->root;
242         struct fw_filter *f = (struct fw_filter *) *arg;
243         struct nlattr *opt = tca[TCA_OPTIONS];
244         struct nlattr *tb[TCA_FW_MAX + 1];
245         int err;
246
247         if (!opt)
248                 return handle ? -EINVAL : 0;
249
250         err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
251         if (err < 0)
252                 return err;
253
254         if (f != NULL) {
255                 if (f->id != handle && handle)
256                         return -EINVAL;
257                 return fw_change_attrs(tp, f, tb, tca, base);
258         }
259
260         if (!handle)
261                 return -EINVAL;
262
263         if (head == NULL) {
264                 u32 mask = 0xFFFFFFFF;
265                 if (tb[TCA_FW_MASK])
266                         mask = nla_get_u32(tb[TCA_FW_MASK]);
267
268                 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
269                 if (head == NULL)
270                         return -ENOBUFS;
271                 head->mask = mask;
272
273                 tcf_tree_lock(tp);
274                 tp->root = head;
275                 tcf_tree_unlock(tp);
276         }
277
278         f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
279         if (f == NULL)
280                 return -ENOBUFS;
281
282         f->id = handle;
283
284         err = fw_change_attrs(tp, f, tb, tca, base);
285         if (err < 0)
286                 goto errout;
287
288         f->next = head->ht[fw_hash(handle)];
289         tcf_tree_lock(tp);
290         head->ht[fw_hash(handle)] = f;
291         tcf_tree_unlock(tp);
292
293         *arg = (unsigned long)f;
294         return 0;
295
296 errout:
297         kfree(f);
298         return err;
299 }
300
301 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
302 {
303         struct fw_head *head = (struct fw_head *)tp->root;
304         int h;
305
306         if (head == NULL)
307                 arg->stop = 1;
308
309         if (arg->stop)
310                 return;
311
312         for (h = 0; h < HTSIZE; h++) {
313                 struct fw_filter *f;
314
315                 for (f = head->ht[h]; f; f = f->next) {
316                         if (arg->count < arg->skip) {
317                                 arg->count++;
318                                 continue;
319                         }
320                         if (arg->fn(tp, (unsigned long)f, arg) < 0) {
321                                 arg->stop = 1;
322                                 return;
323                         }
324                         arg->count++;
325                 }
326         }
327 }
328
329 static int fw_dump(struct tcf_proto *tp, unsigned long fh,
330                    struct sk_buff *skb, struct tcmsg *t)
331 {
332         struct fw_head *head = (struct fw_head *)tp->root;
333         struct fw_filter *f = (struct fw_filter *)fh;
334         unsigned char *b = skb_tail_pointer(skb);
335         struct nlattr *nest;
336
337         if (f == NULL)
338                 return skb->len;
339
340         t->tcm_handle = f->id;
341
342         if (!f->res.classid && !tcf_exts_is_available(&f->exts))
343                 return skb->len;
344
345         nest = nla_nest_start(skb, TCA_OPTIONS);
346         if (nest == NULL)
347                 goto nla_put_failure;
348
349         if (f->res.classid)
350                 NLA_PUT_U32(skb, TCA_FW_CLASSID, f->res.classid);
351 #ifdef CONFIG_NET_CLS_IND
352         if (strlen(f->indev))
353                 NLA_PUT_STRING(skb, TCA_FW_INDEV, f->indev);
354 #endif /* CONFIG_NET_CLS_IND */
355         if (head->mask != 0xFFFFFFFF)
356                 NLA_PUT_U32(skb, TCA_FW_MASK, head->mask);
357
358         if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
359                 goto nla_put_failure;
360
361         nla_nest_end(skb, nest);
362
363         if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
364                 goto nla_put_failure;
365
366         return skb->len;
367
368 nla_put_failure:
369         nlmsg_trim(skb, b);
370         return -1;
371 }
372
373 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
374         .kind           =       "fw",
375         .classify       =       fw_classify,
376         .init           =       fw_init,
377         .destroy        =       fw_destroy,
378         .get            =       fw_get,
379         .put            =       fw_put,
380         .change         =       fw_change,
381         .delete         =       fw_delete,
382         .walk           =       fw_walk,
383         .dump           =       fw_dump,
384         .owner          =       THIS_MODULE,
385 };
386
387 static int __init init_fw(void)
388 {
389         return register_tcf_proto_ops(&cls_fw_ops);
390 }
391
392 static void __exit exit_fw(void)
393 {
394         unregister_tcf_proto_ops(&cls_fw_ops);
395 }
396
397 module_init(init_fw)
398 module_exit(exit_fw)
399 MODULE_LICENSE("GPL");