1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
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
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
97 r = tcf_exts_exec(skb, &f->exts, res);
98 if (r < 0)
99 continue;
100
101 return r;
102 }
103 }
104 } else {
105
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
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#ifdef CONFIG_NET_CLS_IND
352 if (strlen(f->indev))
353 NLA_PUT_STRING(skb, TCA_FW_INDEV, f->indev);
354#endif
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
368nla_put_failure:
369 nlmsg_trim(skb, b);
370 return -1;
371}
372
373static 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
387static int __init init_fw(void)
388{
389 return register_tcf_proto_ops(&cls_fw_ops);
390}
391
392static void __exit exit_fw(void)
393{
394 unregister_tcf_proto_ops(&cls_fw_ops);
395}
396
397module_init(init_fw)
398module_exit(exit_fw)
399MODULE_LICENSE("GPL");
400
