ip: fix mc_loop checks for tunnels with multicast outer addresses
[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/types.h>
23 #include <linux/kernel.h>
24 #include <linux/string.h>
25 #include <linux/errno.h>
26 #include <linux/skbuff.h>
27 #include <net/netlink.h>
28 #include <net/act_api.h>
29 #include <net/pkt_cls.h>
30
31 #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
32
33 struct fw_head
34 {
35         struct fw_filter *ht[HTSIZE];
36         u32 mask;
37 };
38
39 struct 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
50 static const struct tcf_ext_map fw_ext_map = {
51         .action = TCA_FW_ACT,
52         .police = TCA_FW_POLICE
53 };
54
55 static __inline__ int fw_hash(u32 handle)
56 {
57         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];
77         } else
78                 return handle & (HTSIZE - 1);
79 }
80
81 static 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;
87         u32 id = skb->mark;
88
89         if (head != NULL) {
90                 id &= head->mask;
91                 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
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 inline void
142 fw_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
149 static void fw_destroy(struct tcf_proto *tp)
150 {
151         struct fw_head *head = tp->root;
152         struct fw_filter *f;
153         int h;
154
155         if (head == NULL)
156                 return;
157
158         for (h=0; h<HTSIZE; h++) {
159                 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
167 static 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         }
185 out:
186         return -EINVAL;
187 }
188
189 static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
190         [TCA_FW_CLASSID]        = { .type = NLA_U32 },
191         [TCA_FW_INDEV]          = { .type = NLA_STRING, .len = IFNAMSIZ },
192         [TCA_FW_MASK]           = { .type = NLA_U32 },
193 };
194
195 static int
196 fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
197         struct nlattr **tb, struct nlattr **tca, unsigned long base)
198 {
199         struct fw_head *head = (struct fw_head *)tp->root;
200         struct tcf_exts e;
201         u32 mask;
202         int err;
203
204         err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
205         if (err < 0)
206                 return err;
207
208         err = -EINVAL;
209         if (tb[TCA_FW_CLASSID]) {
210                 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
211                 tcf_bind_filter(tp, &f->res, base);
212         }
213
214 #ifdef CONFIG_NET_CLS_IND
215         if (tb[TCA_FW_INDEV]) {
216                 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
217                 if (err < 0)
218                         goto errout;
219         }
220 #endif /* CONFIG_NET_CLS_IND */
221
222         if (tb[TCA_FW_MASK]) {
223                 mask = nla_get_u32(tb[TCA_FW_MASK]);
224                 if (mask != head->mask)
225                         goto errout;
226         } else if (head->mask != 0xFFFFFFFF)
227                 goto errout;
228
229         tcf_exts_change(tp, &f->exts, &e);
230
231         return 0;
232 errout:
233         tcf_exts_destroy(tp, &e);
234         return err;
235 }
236
237 static int fw_change(struct tcf_proto *tp, unsigned long base,
238                      u32 handle,
239                      struct nlattr **tca,
240                      unsigned long *arg)
241 {
242         struct fw_head *head = (struct fw_head*)tp->root;
243         struct fw_filter *f = (struct fw_filter *) *arg;
244         struct nlattr *opt = tca[TCA_OPTIONS];
245         struct nlattr *tb[TCA_FW_MAX + 1];
246         int err;
247
248         if (!opt)
249                 return handle ? -EINVAL : 0;
250
251         err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
252         if (err < 0)
253                 return err;
254
255         if (f != NULL) {
256                 if (f->id != handle && handle)
257                         return -EINVAL;
258                 return fw_change_attrs(tp, f, tb, tca, base);
259         }
260
261         if (!handle)
262                 return -EINVAL;
263
264         if (head == NULL) {
265                 u32 mask = 0xFFFFFFFF;
266                 if (tb[TCA_FW_MASK])
267                         mask = nla_get_u32(tb[TCA_FW_MASK]);
268
269                 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
270                 if (head == NULL)
271                         return -ENOBUFS;
272                 head->mask = mask;
273
274                 tcf_tree_lock(tp);
275                 tp->root = head;
276                 tcf_tree_unlock(tp);
277         }
278
279         f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
280         if (f == NULL)
281                 return -ENOBUFS;
282
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
297 errout:
298         kfree(f);
299         return err;
300 }
301
302 static 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
313         for (h = 0; h < HTSIZE; h++) {
314                 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
330 static int fw_dump(struct tcf_proto *tp, unsigned long fh,
331                    struct sk_buff *skb, struct tcmsg *t)
332 {
333         struct fw_head *head = (struct fw_head *)tp->root;
334         struct fw_filter *f = (struct fw_filter*)fh;
335         unsigned char *b = skb_tail_pointer(skb);
336         struct nlattr *nest;
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         nest = nla_nest_start(skb, TCA_OPTIONS);
347         if (nest == NULL)
348                 goto nla_put_failure;
349
350         if (f->res.classid)
351                 NLA_PUT_U32(skb, TCA_FW_CLASSID, f->res.classid);
352 #ifdef CONFIG_NET_CLS_IND
353         if (strlen(f->indev))
354                 NLA_PUT_STRING(skb, TCA_FW_INDEV, f->indev);
355 #endif /* CONFIG_NET_CLS_IND */
356         if (head->mask != 0xFFFFFFFF)
357                 NLA_PUT_U32(skb, TCA_FW_MASK, head->mask);
358
359         if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
360                 goto nla_put_failure;
361
362         nla_nest_end(skb, nest);
363
364         if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
365                 goto nla_put_failure;
366
367         return skb->len;
368
369 nla_put_failure:
370         nlmsg_trim(skb, b);
371         return -1;
372 }
373
374 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
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
388 static int __init init_fw(void)
389 {
390         return register_tcf_proto_ops(&cls_fw_ops);
391 }
392
393 static void __exit exit_fw(void)
394 {
395         unregister_tcf_proto_ops(&cls_fw_ops);
396 }
397
398 module_init(init_fw)
399 module_exit(exit_fw)
400 MODULE_LICENSE("GPL");