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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
34struct fw_head {
35 struct fw_filter *ht[HTSIZE];
36 u32 mask;
37};
38
39struct 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
49static const struct tcf_ext_map fw_ext_map = {
50 .action = TCA_FW_ACT,
51 .police = TCA_FW_POLICE
52};
53
54static 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
80static 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
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 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
148static 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
166static 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 }
184out:
185 return -EINVAL;
186}
187
188static 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
194static int
195fw_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;
231errout:
232 tcf_exts_destroy(tp, &e);
233 return err;
234}
235
236static 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
296errout:
297 kfree(f);
298 return err;
299}
300
301static 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
329static 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 goto nla_put_failure;
352#ifdef CONFIG_NET_CLS_IND
353 if (strlen(f->indev) &&
354 nla_put_string(skb, TCA_FW_INDEV, f->indev))
355 goto nla_put_failure;
356#endif /* CONFIG_NET_CLS_IND */
357 if (head->mask != 0xFFFFFFFF &&
358 nla_put_u32(skb, TCA_FW_MASK, head->mask))
359 goto nla_put_failure;
360
361 if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
362 goto nla_put_failure;
363
364 nla_nest_end(skb, nest);
365
366 if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
367 goto nla_put_failure;
368
369 return skb->len;
370
371nla_put_failure:
372 nlmsg_trim(skb, b);
373 return -1;
374}
375
376static struct tcf_proto_ops cls_fw_ops __read_mostly = {
377 .kind = "fw",
378 .classify = fw_classify,
379 .init = fw_init,
380 .destroy = fw_destroy,
381 .get = fw_get,
382 .put = fw_put,
383 .change = fw_change,
384 .delete = fw_delete,
385 .walk = fw_walk,
386 .dump = fw_dump,
387 .owner = THIS_MODULE,
388};
389
390static int __init init_fw(void)
391{
392 return register_tcf_proto_ops(&cls_fw_ops);
393}
394
395static void __exit exit_fw(void)
396{
397 unregister_tcf_proto_ops(&cls_fw_ops);
398}
399
400module_init(init_fw)
401module_exit(exit_fw)
402MODULE_LICENSE("GPL");
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 256
33
34struct fw_head {
35 u32 mask;
36 struct fw_filter *ht[HTSIZE];
37};
38
39struct fw_filter {
40 struct fw_filter *next;
41 u32 id;
42 struct tcf_result res;
43#ifdef CONFIG_NET_CLS_IND
44 int ifindex;
45#endif /* CONFIG_NET_CLS_IND */
46 struct tcf_exts exts;
47};
48
49static u32 fw_hash(u32 handle)
50{
51 handle ^= (handle >> 16);
52 handle ^= (handle >> 8);
53 return handle % HTSIZE;
54}
55
56static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
57 struct tcf_result *res)
58{
59 struct fw_head *head = tp->root;
60 struct fw_filter *f;
61 int r;
62 u32 id = skb->mark;
63
64 if (head != NULL) {
65 id &= head->mask;
66 for (f = head->ht[fw_hash(id)]; f; f = f->next) {
67 if (f->id == id) {
68 *res = f->res;
69#ifdef CONFIG_NET_CLS_IND
70 if (!tcf_match_indev(skb, f->ifindex))
71 continue;
72#endif /* CONFIG_NET_CLS_IND */
73 r = tcf_exts_exec(skb, &f->exts, res);
74 if (r < 0)
75 continue;
76
77 return r;
78 }
79 }
80 } else {
81 /* old method */
82 if (id && (TC_H_MAJ(id) == 0 ||
83 !(TC_H_MAJ(id ^ tp->q->handle)))) {
84 res->classid = id;
85 res->class = 0;
86 return 0;
87 }
88 }
89
90 return -1;
91}
92
93static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
94{
95 struct fw_head *head = tp->root;
96 struct fw_filter *f;
97
98 if (head == NULL)
99 return 0;
100
101 for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
102 if (f->id == handle)
103 return (unsigned long)f;
104 }
105 return 0;
106}
107
108static void fw_put(struct tcf_proto *tp, unsigned long f)
109{
110}
111
112static int fw_init(struct tcf_proto *tp)
113{
114 return 0;
115}
116
117static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
118{
119 tcf_unbind_filter(tp, &f->res);
120 tcf_exts_destroy(tp, &f->exts);
121 kfree(f);
122}
123
124static void fw_destroy(struct tcf_proto *tp)
125{
126 struct fw_head *head = tp->root;
127 struct fw_filter *f;
128 int h;
129
130 if (head == NULL)
131 return;
132
133 for (h = 0; h < HTSIZE; h++) {
134 while ((f = head->ht[h]) != NULL) {
135 head->ht[h] = f->next;
136 fw_delete_filter(tp, f);
137 }
138 }
139 kfree(head);
140}
141
142static int fw_delete(struct tcf_proto *tp, unsigned long arg)
143{
144 struct fw_head *head = tp->root;
145 struct fw_filter *f = (struct fw_filter *)arg;
146 struct fw_filter **fp;
147
148 if (head == NULL || f == NULL)
149 goto out;
150
151 for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
152 if (*fp == f) {
153 tcf_tree_lock(tp);
154 *fp = f->next;
155 tcf_tree_unlock(tp);
156 fw_delete_filter(tp, f);
157 return 0;
158 }
159 }
160out:
161 return -EINVAL;
162}
163
164static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
165 [TCA_FW_CLASSID] = { .type = NLA_U32 },
166 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
167 [TCA_FW_MASK] = { .type = NLA_U32 },
168};
169
170static int
171fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
172 struct nlattr **tb, struct nlattr **tca, unsigned long base)
173{
174 struct fw_head *head = tp->root;
175 struct tcf_exts e;
176 u32 mask;
177 int err;
178
179 tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
180 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e);
181 if (err < 0)
182 return err;
183
184 if (tb[TCA_FW_CLASSID]) {
185 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
186 tcf_bind_filter(tp, &f->res, base);
187 }
188
189#ifdef CONFIG_NET_CLS_IND
190 if (tb[TCA_FW_INDEV]) {
191 int ret;
192 ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
193 if (ret < 0) {
194 err = ret;
195 goto errout;
196 }
197 f->ifindex = ret;
198 }
199#endif /* CONFIG_NET_CLS_IND */
200
201 err = -EINVAL;
202 if (tb[TCA_FW_MASK]) {
203 mask = nla_get_u32(tb[TCA_FW_MASK]);
204 if (mask != head->mask)
205 goto errout;
206 } else if (head->mask != 0xFFFFFFFF)
207 goto errout;
208
209 tcf_exts_change(tp, &f->exts, &e);
210
211 return 0;
212errout:
213 tcf_exts_destroy(tp, &e);
214 return err;
215}
216
217static int fw_change(struct net *net, struct sk_buff *in_skb,
218 struct tcf_proto *tp, unsigned long base,
219 u32 handle,
220 struct nlattr **tca,
221 unsigned long *arg)
222{
223 struct fw_head *head = tp->root;
224 struct fw_filter *f = (struct fw_filter *) *arg;
225 struct nlattr *opt = tca[TCA_OPTIONS];
226 struct nlattr *tb[TCA_FW_MAX + 1];
227 int err;
228
229 if (!opt)
230 return handle ? -EINVAL : 0;
231
232 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
233 if (err < 0)
234 return err;
235
236 if (f != NULL) {
237 if (f->id != handle && handle)
238 return -EINVAL;
239 return fw_change_attrs(net, tp, f, tb, tca, base);
240 }
241
242 if (!handle)
243 return -EINVAL;
244
245 if (head == NULL) {
246 u32 mask = 0xFFFFFFFF;
247 if (tb[TCA_FW_MASK])
248 mask = nla_get_u32(tb[TCA_FW_MASK]);
249
250 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
251 if (head == NULL)
252 return -ENOBUFS;
253 head->mask = mask;
254
255 tcf_tree_lock(tp);
256 tp->root = head;
257 tcf_tree_unlock(tp);
258 }
259
260 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
261 if (f == NULL)
262 return -ENOBUFS;
263
264 tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
265 f->id = handle;
266
267 err = fw_change_attrs(net, tp, f, tb, tca, base);
268 if (err < 0)
269 goto errout;
270
271 f->next = head->ht[fw_hash(handle)];
272 tcf_tree_lock(tp);
273 head->ht[fw_hash(handle)] = f;
274 tcf_tree_unlock(tp);
275
276 *arg = (unsigned long)f;
277 return 0;
278
279errout:
280 kfree(f);
281 return err;
282}
283
284static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
285{
286 struct fw_head *head = tp->root;
287 int h;
288
289 if (head == NULL)
290 arg->stop = 1;
291
292 if (arg->stop)
293 return;
294
295 for (h = 0; h < HTSIZE; h++) {
296 struct fw_filter *f;
297
298 for (f = head->ht[h]; f; f = f->next) {
299 if (arg->count < arg->skip) {
300 arg->count++;
301 continue;
302 }
303 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
304 arg->stop = 1;
305 return;
306 }
307 arg->count++;
308 }
309 }
310}
311
312static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
313 struct sk_buff *skb, struct tcmsg *t)
314{
315 struct fw_head *head = tp->root;
316 struct fw_filter *f = (struct fw_filter *)fh;
317 unsigned char *b = skb_tail_pointer(skb);
318 struct nlattr *nest;
319
320 if (f == NULL)
321 return skb->len;
322
323 t->tcm_handle = f->id;
324
325 if (!f->res.classid && !tcf_exts_is_available(&f->exts))
326 return skb->len;
327
328 nest = nla_nest_start(skb, TCA_OPTIONS);
329 if (nest == NULL)
330 goto nla_put_failure;
331
332 if (f->res.classid &&
333 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
334 goto nla_put_failure;
335#ifdef CONFIG_NET_CLS_IND
336 if (f->ifindex) {
337 struct net_device *dev;
338 dev = __dev_get_by_index(net, f->ifindex);
339 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
340 goto nla_put_failure;
341 }
342#endif /* CONFIG_NET_CLS_IND */
343 if (head->mask != 0xFFFFFFFF &&
344 nla_put_u32(skb, TCA_FW_MASK, head->mask))
345 goto nla_put_failure;
346
347 if (tcf_exts_dump(skb, &f->exts) < 0)
348 goto nla_put_failure;
349
350 nla_nest_end(skb, nest);
351
352 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
353 goto nla_put_failure;
354
355 return skb->len;
356
357nla_put_failure:
358 nlmsg_trim(skb, b);
359 return -1;
360}
361
362static struct tcf_proto_ops cls_fw_ops __read_mostly = {
363 .kind = "fw",
364 .classify = fw_classify,
365 .init = fw_init,
366 .destroy = fw_destroy,
367 .get = fw_get,
368 .put = fw_put,
369 .change = fw_change,
370 .delete = fw_delete,
371 .walk = fw_walk,
372 .dump = fw_dump,
373 .owner = THIS_MODULE,
374};
375
376static int __init init_fw(void)
377{
378 return register_tcf_proto_ops(&cls_fw_ops);
379}
380
381static void __exit exit_fw(void)
382{
383 unregister_tcf_proto_ops(&cls_fw_ops);
384}
385
386module_init(init_fw)
387module_exit(exit_fw)
388MODULE_LICENSE("GPL");