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Linux/net/sched/cls_fw.c

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  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 net *net, 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(net, tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
204         if (err < 0)
205                 return err;
206 
207         if (tb[TCA_FW_CLASSID]) {
208                 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
209                 tcf_bind_filter(tp, &f->res, base);
210         }
211 
212 #ifdef CONFIG_NET_CLS_IND
213         if (tb[TCA_FW_INDEV]) {
214                 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
215                 if (err < 0)
216                         goto errout;
217         }
218 #endif /* CONFIG_NET_CLS_IND */
219 
220         err = -EINVAL;
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 net *net, struct sk_buff *in_skb,
237                      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(net, 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(net, 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                 goto nla_put_failure;
353 #ifdef CONFIG_NET_CLS_IND
354         if (strlen(f->indev) &&
355             nla_put_string(skb, TCA_FW_INDEV, f->indev))
356                 goto nla_put_failure;
357 #endif /* CONFIG_NET_CLS_IND */
358         if (head->mask != 0xFFFFFFFF &&
359             nla_put_u32(skb, TCA_FW_MASK, head->mask))
360                 goto nla_put_failure;
361 
362         if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
363                 goto nla_put_failure;
364 
365         nla_nest_end(skb, nest);
366 
367         if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
368                 goto nla_put_failure;
369 
370         return skb->len;
371 
372 nla_put_failure:
373         nlmsg_trim(skb, b);
374         return -1;
375 }
376 
377 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
378         .kind           =       "fw",
379         .classify       =       fw_classify,
380         .init           =       fw_init,
381         .destroy        =       fw_destroy,
382         .get            =       fw_get,
383         .put            =       fw_put,
384         .change         =       fw_change,
385         .delete         =       fw_delete,
386         .walk           =       fw_walk,
387         .dump           =       fw_dump,
388         .owner          =       THIS_MODULE,
389 };
390 
391 static int __init init_fw(void)
392 {
393         return register_tcf_proto_ops(&cls_fw_ops);
394 }
395 
396 static void __exit exit_fw(void)
397 {
398         unregister_tcf_proto_ops(&cls_fw_ops);
399 }
400 
401 module_init(init_fw)
402 module_exit(exit_fw)
403 MODULE_LICENSE("GPL");
404 

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