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12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/string.h>
16#include <linux/errno.h>
17#include <linux/skbuff.h>
18#include <net/dst.h>
19#include <net/route.h>
20#include <net/netlink.h>
21#include <net/act_api.h>
22#include <net/pkt_cls.h>
23
24
25
26
27
28
29
30
31
32struct route4_fastmap
33{
34 struct route4_filter *filter;
35 u32 id;
36 int iif;
37};
38
39struct route4_head
40{
41 struct route4_fastmap fastmap[16];
42 struct route4_bucket *table[256+1];
43};
44
45struct route4_bucket
46{
47
48 struct route4_filter *ht[16+16+1];
49};
50
51struct route4_filter
52{
53 struct route4_filter *next;
54 u32 id;
55 int iif;
56
57 struct tcf_result res;
58 struct tcf_exts exts;
59 u32 handle;
60 struct route4_bucket *bkt;
61};
62
63#define ROUTE4_FAILURE ((struct route4_filter*)(-1L))
64
65static const struct tcf_ext_map route_ext_map = {
66 .police = TCA_ROUTE4_POLICE,
67 .action = TCA_ROUTE4_ACT
68};
69
70static __inline__ int route4_fastmap_hash(u32 id, int iif)
71{
72 return id&0xF;
73}
74
75static inline
76void route4_reset_fastmap(struct Qdisc *q, struct route4_head *head, u32 id)
77{
78 spinlock_t *root_lock = qdisc_root_sleeping_lock(q);
79
80 spin_lock_bh(root_lock);
81 memset(head->fastmap, 0, sizeof(head->fastmap));
82 spin_unlock_bh(root_lock);
83}
84
85static inline void
86route4_set_fastmap(struct route4_head *head, u32 id, int iif,
87 struct route4_filter *f)
88{
89 int h = route4_fastmap_hash(id, iif);
90 head->fastmap[h].id = id;
91 head->fastmap[h].iif = iif;
92 head->fastmap[h].filter = f;
93}
94
95static __inline__ int route4_hash_to(u32 id)
96{
97 return id&0xFF;
98}
99
100static __inline__ int route4_hash_from(u32 id)
101{
102 return (id>>16)&0xF;
103}
104
105static __inline__ int route4_hash_iif(int iif)
106{
107 return 16 + ((iif>>16)&0xF);
108}
109
110static __inline__ int route4_hash_wild(void)
111{
112 return 32;
113}
114
115#define ROUTE4_APPLY_RESULT() \
116{ \
117 *res = f->res; \
118 if (tcf_exts_is_available(&f->exts)) { \
119 int r = tcf_exts_exec(skb, &f->exts, res); \
120 if (r < 0) { \
121 dont_cache = 1; \
122 continue; \
123 } \
124 return r; \
125 } else if (!dont_cache) \
126 route4_set_fastmap(head, id, iif, f); \
127 return 0; \
128}
129
130static int route4_classify(struct sk_buff *skb, struct tcf_proto *tp,
131 struct tcf_result *res)
132{
133 struct route4_head *head = (struct route4_head*)tp->root;
134 struct dst_entry *dst;
135 struct route4_bucket *b;
136 struct route4_filter *f;
137 u32 id, h;
138 int iif, dont_cache = 0;
139
140 if ((dst = skb->dst) == NULL)
141 goto failure;
142
143 id = dst->tclassid;
144 if (head == NULL)
145 goto old_method;
146
147 iif = ((struct rtable*)dst)->fl.iif;
148
149 h = route4_fastmap_hash(id, iif);
150 if (id == head->fastmap[h].id &&
151 iif == head->fastmap[h].iif &&
152 (f = head->fastmap[h].filter) != NULL) {
153 if (f == ROUTE4_FAILURE)
154 goto failure;
155
156 *res = f->res;
157 return 0;
158 }
159
160 h = route4_hash_to(id);
161
162restart:
163 if ((b = head->table[h]) != NULL) {
164 for (f = b->ht[route4_hash_from(id)]; f; f = f->next)
165 if (f->id == id)
166 ROUTE4_APPLY_RESULT();
167
168 for (f = b->ht[route4_hash_iif(iif)]; f; f = f->next)
169 if (f->iif == iif)
170 ROUTE4_APPLY_RESULT();
171
172 for (f = b->ht[route4_hash_wild()]; f; f = f->next)
173 ROUTE4_APPLY_RESULT();
174
175 }
176 if (h < 256) {
177 h = 256;
178 id &= ~0xFFFF;
179 goto restart;
180 }
181
182 if (!dont_cache)
183 route4_set_fastmap(head, id, iif, ROUTE4_FAILURE);
184failure:
185 return -1;
186
187old_method:
188 if (id && (TC_H_MAJ(id) == 0 ||
189 !(TC_H_MAJ(id^tp->q->handle)))) {
190 res->classid = id;
191 res->class = 0;
192 return 0;
193 }
194 return -1;
195}
196
197static inline u32 to_hash(u32 id)
198{
199 u32 h = id&0xFF;
200 if (id&0x8000)
201 h += 256;
202 return h;
203}
204
205static inline u32 from_hash(u32 id)
206{
207 id &= 0xFFFF;
208 if (id == 0xFFFF)
209 return 32;
210 if (!(id & 0x8000)) {
211 if (id > 255)
212 return 256;
213 return id&0xF;
214 }
215 return 16 + (id&0xF);
216}
217
218static unsigned long route4_get(struct tcf_proto *tp, u32 handle)
219{
220 struct route4_head *head = (struct route4_head*)tp->root;
221 struct route4_bucket *b;
222 struct route4_filter *f;
223 unsigned h1, h2;
224
225 if (!head)
226 return 0;
227
228 h1 = to_hash(handle);
229 if (h1 > 256)
230 return 0;
231
232 h2 = from_hash(handle>>16);
233 if (h2 > 32)
234 return 0;
235
236 if ((b = head->table[h1]) != NULL) {
237 for (f = b->ht[h2]; f; f = f->next)
238 if (f->handle == handle)
239 return (unsigned long)f;
240 }
241 return 0;
242}
243
244static void route4_put(struct tcf_proto *tp, unsigned long f)
245{
246}
247
248static int route4_init(struct tcf_proto *tp)
249{
250 return 0;
251}
252
253static inline void
254route4_delete_filter(struct tcf_proto *tp, struct route4_filter *f)
255{
256 tcf_unbind_filter(tp, &f->res);
257 tcf_exts_destroy(tp, &f->exts);
258 kfree(f);
259}
260
261static void route4_destroy(struct tcf_proto *tp)
262{
263 struct route4_head *head = xchg(&tp->root, NULL);
264 int h1, h2;
265
266 if (head == NULL)
267 return;
268
269 for (h1=0; h1<=256; h1++) {
270 struct route4_bucket *b;
271
272 if ((b = head->table[h1]) != NULL) {
273 for (h2=0; h2<=32; h2++) {
274 struct route4_filter *f;
275
276 while ((f = b->ht[h2]) != NULL) {
277 b->ht[h2] = f->next;
278 route4_delete_filter(tp, f);
279 }
280 }
281 kfree(b);
282 }
283 }
284 kfree(head);
285}
286
287static int route4_delete(struct tcf_proto *tp, unsigned long arg)
288{
289 struct route4_head *head = (struct route4_head*)tp->root;
290 struct route4_filter **fp, *f = (struct route4_filter*)arg;
291 unsigned h = 0;
292 struct route4_bucket *b;
293 int i;
294
295 if (!head || !f)
296 return -EINVAL;
297
298 h = f->handle;
299 b = f->bkt;
300
301 for (fp = &b->ht[from_hash(h>>16)]; *fp; fp = &(*fp)->next) {
302 if (*fp == f) {
303 tcf_tree_lock(tp);
304 *fp = f->next;
305 tcf_tree_unlock(tp);
306
307 route4_reset_fastmap(tp->q, head, f->id);
308 route4_delete_filter(tp, f);
309
310
311
312 for (i=0; i<=32; i++)
313 if (b->ht[i])
314 return 0;
315
316
317 tcf_tree_lock(tp);
318 head->table[to_hash(h)] = NULL;
319 tcf_tree_unlock(tp);
320
321 kfree(b);
322 return 0;
323 }
324 }
325 return 0;
326}
327
328static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = {
329 [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 },
330 [TCA_ROUTE4_TO] = { .type = NLA_U32 },
331 [TCA_ROUTE4_FROM] = { .type = NLA_U32 },
332 [TCA_ROUTE4_IIF] = { .type = NLA_U32 },
333};
334
335static int route4_set_parms(struct tcf_proto *tp, unsigned long base,
336 struct route4_filter *f, u32 handle, struct route4_head *head,
337 struct nlattr **tb, struct nlattr *est, int new)
338{
339 int err;
340 u32 id = 0, to = 0, nhandle = 0x8000;
341 struct route4_filter *fp;
342 unsigned int h1;
343 struct route4_bucket *b;
344 struct tcf_exts e;
345
346 err = tcf_exts_validate(tp, tb, est, &e, &route_ext_map);
347 if (err < 0)
348 return err;
349
350 err = -EINVAL;
351 if (tb[TCA_ROUTE4_TO]) {
352 if (new && handle & 0x8000)
353 goto errout;
354 to = nla_get_u32(tb[TCA_ROUTE4_TO]);
355 if (to > 0xFF)
356 goto errout;
357 nhandle = to;
358 }
359
360 if (tb[TCA_ROUTE4_FROM]) {
361 if (tb[TCA_ROUTE4_IIF])
362 goto errout;
363 id = nla_get_u32(tb[TCA_ROUTE4_FROM]);
364 if (id > 0xFF)
365 goto errout;
366 nhandle |= id << 16;
367 } else if (tb[TCA_ROUTE4_IIF]) {
368 id = nla_get_u32(tb[TCA_ROUTE4_IIF]);
369 if (id > 0x7FFF)
370 goto errout;
371 nhandle |= (id | 0x8000) << 16;
372 } else
373 nhandle |= 0xFFFF << 16;
374
375 if (handle && new) {
376 nhandle |= handle & 0x7F00;
377 if (nhandle != handle)
378 goto errout;
379 }
380
381 h1 = to_hash(nhandle);
382 if ((b = head->table[h1]) == NULL) {
383 err = -ENOBUFS;
384 b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
385 if (b == NULL)
386 goto errout;
387
388 tcf_tree_lock(tp);
389 head->table[h1] = b;
390 tcf_tree_unlock(tp);
391 } else {
392 unsigned int h2 = from_hash(nhandle >> 16);
393 err = -EEXIST;
394 for (fp = b->ht[h2]; fp; fp = fp->next)
395 if (fp->handle == f->handle)
396 goto errout;
397 }
398
399 tcf_tree_lock(tp);
400 if (tb[TCA_ROUTE4_TO])
401 f->id = to;
402
403 if (tb[TCA_ROUTE4_FROM])
404 f->id = to | id<<16;
405 else if (tb[TCA_ROUTE4_IIF])
406 f->iif = id;
407
408 f->handle = nhandle;
409 f->bkt = b;
410 tcf_tree_unlock(tp);
411
412 if (tb[TCA_ROUTE4_CLASSID]) {
413 f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]);
414 tcf_bind_filter(tp, &f->res, base);
415 }
416
417 tcf_exts_change(tp, &f->exts, &e);
418
419 return 0;
420errout:
421 tcf_exts_destroy(tp, &e);
422 return err;
423}
424
425static int route4_change(struct tcf_proto *tp, unsigned long base,
426 u32 handle,
427 struct nlattr **tca,
428 unsigned long *arg)
429{
430 struct route4_head *head = tp->root;
431 struct route4_filter *f, *f1, **fp;
432 struct route4_bucket *b;
433 struct nlattr *opt = tca[TCA_OPTIONS];
434 struct nlattr *tb[TCA_ROUTE4_MAX + 1];
435 unsigned int h, th;
436 u32 old_handle = 0;
437 int err;
438
439 if (opt == NULL)
440 return handle ? -EINVAL : 0;
441
442 err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy);
443 if (err < 0)
444 return err;
445
446 if ((f = (struct route4_filter*)*arg) != NULL) {
447 if (f->handle != handle && handle)
448 return -EINVAL;
449
450 if (f->bkt)
451 old_handle = f->handle;
452
453 err = route4_set_parms(tp, base, f, handle, head, tb,
454 tca[TCA_RATE], 0);
455 if (err < 0)
456 return err;
457
458 goto reinsert;
459 }
460
461 err = -ENOBUFS;
462 if (head == NULL) {
463 head = kzalloc(sizeof(struct route4_head), GFP_KERNEL);
464 if (head == NULL)
465 goto errout;
466
467 tcf_tree_lock(tp);
468 tp->root = head;
469 tcf_tree_unlock(tp);
470 }
471
472 f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL);
473 if (f == NULL)
474 goto errout;
475
476 err = route4_set_parms(tp, base, f, handle, head, tb,
477 tca[TCA_RATE], 1);
478 if (err < 0)
479 goto errout;
480
481reinsert:
482 h = from_hash(f->handle >> 16);
483 for (fp = &f->bkt->ht[h]; (f1=*fp) != NULL; fp = &f1->next)
484 if (f->handle < f1->handle)
485 break;
486
487 f->next = f1;
488 tcf_tree_lock(tp);
489 *fp = f;
490
491 if (old_handle && f->handle != old_handle) {
492 th = to_hash(old_handle);
493 h = from_hash(old_handle >> 16);
494 if ((b = head->table[th]) != NULL) {
495 for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) {
496 if (*fp == f) {
497 *fp = f->next;
498 break;
499 }
500 }
501 }
502 }
503 tcf_tree_unlock(tp);
504
505 route4_reset_fastmap(tp->q, head, f->id);
506 *arg = (unsigned long)f;
507 return 0;
508
509errout:
510 kfree(f);
511 return err;
512}
513
514static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
515{
516 struct route4_head *head = tp->root;
517 unsigned h, h1;
518
519 if (head == NULL)
520 arg->stop = 1;
521
522 if (arg->stop)
523 return;
524
525 for (h = 0; h <= 256; h++) {
526 struct route4_bucket *b = head->table[h];
527
528 if (b) {
529 for (h1 = 0; h1 <= 32; h1++) {
530 struct route4_filter *f;
531
532 for (f = b->ht[h1]; f; f = f->next) {
533 if (arg->count < arg->skip) {
534 arg->count++;
535 continue;
536 }
537 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
538 arg->stop = 1;
539 return;
540 }
541 arg->count++;
542 }
543 }
544 }
545 }
546}
547
548static int route4_dump(struct tcf_proto *tp, unsigned long fh,
549 struct sk_buff *skb, struct tcmsg *t)
550{
551 struct route4_filter *f = (struct route4_filter*)fh;
552 unsigned char *b = skb_tail_pointer(skb);
553 struct nlattr *nest;
554 u32 id;
555
556 if (f == NULL)
557 return skb->len;
558
559 t->tcm_handle = f->handle;
560
561 nest = nla_nest_start(skb, TCA_OPTIONS);
562 if (nest == NULL)
563 goto nla_put_failure;
564
565 if (!(f->handle&0x8000)) {
566 id = f->id&0xFF;
567 NLA_PUT_U32(skb, TCA_ROUTE4_TO, id);
568 }
569 if (f->handle&0x80000000) {
570 if ((f->handle>>16) != 0xFFFF)
571 NLA_PUT_U32(skb, TCA_ROUTE4_IIF, f->iif);
572 } else {
573 id = f->id>>16;
574 NLA_PUT_U32(skb, TCA_ROUTE4_FROM, id);
575 }
576 if (f->res.classid)
577 NLA_PUT_U32(skb, TCA_ROUTE4_CLASSID, f->res.classid);
578
579 if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0)
580 goto nla_put_failure;
581
582 nla_nest_end(skb, nest);
583
584 if (tcf_exts_dump_stats(skb, &f->exts, &route_ext_map) < 0)
585 goto nla_put_failure;
586
587 return skb->len;
588
589nla_put_failure:
590 nlmsg_trim(skb, b);
591 return -1;
592}
593
594static struct tcf_proto_ops cls_route4_ops __read_mostly = {
595 .kind = "route",
596 .classify = route4_classify,
597 .init = route4_init,
598 .destroy = route4_destroy,
599 .get = route4_get,
600 .put = route4_put,
601 .change = route4_change,
602 .delete = route4_delete,
603 .walk = route4_walk,
604 .dump = route4_dump,
605 .owner = THIS_MODULE,
606};
607
608static int __init init_route4(void)
609{
610 return register_tcf_proto_ops(&cls_route4_ops);
611}
612
613static void __exit exit_route4(void)
614{
615 unregister_tcf_proto_ops(&cls_route4_ops);
616}
617
618module_init(init_route4)
619module_exit(exit_route4)
620MODULE_LICENSE("GPL");