blob: 4075a0aef2aa2e83fdf167c056e216c3abfc6204 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/types.h>
24#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/skbuff.h>
Patrick McHardy0ba48052007-07-02 22:49:07 -070028#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <net/act_api.h>
30#include <net/pkt_cls.h>
31
Thomas Grafc5c13fa2005-04-24 20:19:54 -070032#define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
33
Eric Dumazetcc7ec452011-01-19 19:26:56 +000034struct fw_head {
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
Eric Dumazetcc7ec452011-01-19 19:26:56 +000039struct fw_filter {
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 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
Patrick McHardy52390082008-01-31 18:36:18 -080049static const struct tcf_ext_map fw_ext_map = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 .action = TCA_FW_ACT,
51 .police = TCA_FW_POLICE
52};
53
Eric Dumazetcc7ec452011-01-19 19:26:56 +000054static inline int fw_hash(u32 handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Thomas Grafc5c13fa2005-04-24 20:19:54 -070056 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];
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090076 } else
Thomas Grafc5c13fa2005-04-24 20:19:54 -070077 return handle & (HTSIZE - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000080static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 struct tcf_result *res)
82{
Eric Dumazetcc7ec452011-01-19 19:26:56 +000083 struct fw_head *head = (struct fw_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 struct fw_filter *f;
85 int r;
Patrick McHardy5c804bf2006-12-05 13:46:13 -080086 u32 id = skb->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 if (head != NULL) {
Patrick McHardy5c804bf2006-12-05 13:46:13 -080089 id &= head->mask;
Eric Dumazetcc7ec452011-01-19 19:26:56 +000090 for (f = head->ht[fw_hash(id)]; f; f = f->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 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 */
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000106 if (id && (TC_H_MAJ(id) == 0 ||
107 !(TC_H_MAJ(id ^ tp->q->handle)))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 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{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000119 struct fw_head *head = (struct fw_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 struct fw_filter *f;
121
122 if (head == NULL)
123 return 0;
124
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000125 for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 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
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000141static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
143 tcf_unbind_filter(tp, &f->res);
144 tcf_exts_destroy(tp, &f->exts);
145 kfree(f);
146}
147
148static void fw_destroy(struct tcf_proto *tp)
149{
Patrick McHardy47a1a1d2008-11-19 08:03:09 +0000150 struct fw_head *head = tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 struct fw_filter *f;
152 int h;
153
154 if (head == NULL)
155 return;
156
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000157 for (h = 0; h < HTSIZE; h++) {
158 while ((f = head->ht[h]) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 head->ht[h] = f->next;
160 fw_delete_filter(tp, f);
161 }
162 }
163 kfree(head);
164}
165
166static int fw_delete(struct tcf_proto *tp, unsigned long arg)
167{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000168 struct fw_head *head = (struct fw_head *)tp->root;
169 struct fw_filter *f = (struct fw_filter *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 struct fw_filter **fp;
171
172 if (head == NULL || f == NULL)
173 goto out;
174
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000175 for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 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 }
184out:
185 return -EINVAL;
186}
187
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800188static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194static int
195fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800196 struct nlattr **tb, struct nlattr **tca, unsigned long base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700198 struct fw_head *head = (struct fw_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 struct tcf_exts e;
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700200 u32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 int err;
202
Patrick McHardyadd93b62008-01-22 22:11:33 -0800203 err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (err < 0)
205 return err;
206
207 err = -EINVAL;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800208 if (tb[TCA_FW_CLASSID]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800209 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 tcf_bind_filter(tp, &f->res, base);
211 }
212
213#ifdef CONFIG_NET_CLS_IND
Patrick McHardyadd93b62008-01-22 22:11:33 -0800214 if (tb[TCA_FW_INDEV]) {
215 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (err < 0)
217 goto errout;
218 }
219#endif /* CONFIG_NET_CLS_IND */
220
Patrick McHardyadd93b62008-01-22 22:11:33 -0800221 if (tb[TCA_FW_MASK]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800222 mask = nla_get_u32(tb[TCA_FW_MASK]);
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700223 if (mask != head->mask)
224 goto errout;
225 } else if (head->mask != 0xFFFFFFFF)
226 goto errout;
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 tcf_exts_change(tp, &f->exts, &e);
229
230 return 0;
231errout:
232 tcf_exts_destroy(tp, &e);
233 return err;
234}
235
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600236static int fw_change(struct sk_buff *in_skb,
237 struct tcf_proto *tp, unsigned long base,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 u32 handle,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800239 struct nlattr **tca,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 unsigned long *arg)
241{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000242 struct fw_head *head = (struct fw_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 struct fw_filter *f = (struct fw_filter *) *arg;
Patrick McHardyadd93b62008-01-22 22:11:33 -0800244 struct nlattr *opt = tca[TCA_OPTIONS];
245 struct nlattr *tb[TCA_FW_MAX + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 int err;
247
248 if (!opt)
249 return handle ? -EINVAL : 0;
250
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800251 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800252 if (err < 0)
253 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
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) {
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700265 u32 mask = 0xFFFFFFFF;
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800266 if (tb[TCA_FW_MASK])
Patrick McHardy1587bac2008-01-23 20:35:03 -0800267 mask = nla_get_u32(tb[TCA_FW_MASK]);
Patrick McHardyb4e9b522006-08-25 16:11:42 -0700268
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{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000304 struct fw_head *head = (struct fw_head *)tp->root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 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;
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000334 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);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800336 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
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
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800346 nest = nla_nest_start(skb, TCA_OPTIONS);
347 if (nest == NULL)
348 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
David S. Miller1b34ec42012-03-29 05:11:39 -0400350 if (f->res.classid &&
351 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
352 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353#ifdef CONFIG_NET_CLS_IND
David S. Miller1b34ec42012-03-29 05:11:39 -0400354 if (strlen(f->indev) &&
355 nla_put_string(skb, TCA_FW_INDEV, f->indev))
356 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357#endif /* CONFIG_NET_CLS_IND */
David S. Miller1b34ec42012-03-29 05:11:39 -0400358 if (head->mask != 0xFFFFFFFF &&
359 nla_put_u32(skb, TCA_FW_MASK, head->mask))
360 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800363 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800365 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800368 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370 return skb->len;
371
Patrick McHardyadd93b62008-01-22 22:11:33 -0800372nla_put_failure:
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -0700373 nlmsg_trim(skb, b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 return -1;
375}
376
Patrick McHardy2eb9d752008-01-22 22:10:42 -0800377static struct tcf_proto_ops cls_fw_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 .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
391static int __init init_fw(void)
392{
393 return register_tcf_proto_ops(&cls_fw_ops);
394}
395
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900396static void __exit exit_fw(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
398 unregister_tcf_proto_ops(&cls_fw_ops);
399}
400
401module_init(init_fw)
402module_exit(exit_fw)
403MODULE_LICENSE("GPL");