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12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/errno.h>
18#include <linux/skbuff.h>
19#include <net/dst.h>
20#include <net/route.h>
21#include <net/netlink.h>
22#include <net/act_api.h>
23#include <net/pkt_cls.h>
24
25
26
27
28
29
30
31
32
33struct route4_fastmap {
34 struct route4_filter *filter;
35 u32 id;
36 int iif;
37};
38
39struct route4_head {
40 struct route4_fastmap fastmap[16];
41 struct route4_bucket *table[256 + 1];
42};
43
44struct route4_bucket {
45
46 struct route4_filter *ht[16 + 16 + 1];
47};
48
49struct route4_filter {
50 struct route4_filter *next;
51 u32 id;
52 int iif;
53
54 struct tcf_result res;
55 struct tcf_exts exts;
56 u32 handle;
57 struct route4_bucket *bkt;
58};
59
60#define ROUTE4_FAILURE ((struct route4_filter *)(-1L))
61
62static const struct tcf_ext_map route_ext_map = {
63 .police = TCA_ROUTE4_POLICE,
64 .action = TCA_ROUTE4_ACT
65};
66
67static inline int route4_fastmap_hash(u32 id, int iif)
68{
69 return id & 0xF;
70}
71
72static void
73route4_reset_fastmap(struct Qdisc *q, struct route4_head *head, u32 id)
74{
75 spinlock_t *root_lock = qdisc_root_sleeping_lock(q);
76
77 spin_lock_bh(root_lock);
78 memset(head->fastmap, 0, sizeof(head->fastmap));
79 spin_unlock_bh(root_lock);
80}
81
82static void
83route4_set_fastmap(struct route4_head *head, u32 id, int iif,
84 struct route4_filter *f)
85{
86 int h = route4_fastmap_hash(id, iif);
87
88 head->fastmap[h].id = id;
89 head->fastmap[h].iif = iif;
90 head->fastmap[h].filter = f;
91}
92
93static inline int route4_hash_to(u32 id)
94{
95 return id & 0xFF;
96}
97
98static inline int route4_hash_from(u32 id)
99{
100 return (id >> 16) & 0xF;
101}
102
103static inline int route4_hash_iif(int iif)
104{
105 return 16 + ((iif >> 16) & 0xF);
106}
107
108static inline int route4_hash_wild(void)
109{
110 return 32;
111}
112
113#define ROUTE4_APPLY_RESULT() \
114{ \
115 *res = f->res; \
116 if (tcf_exts_is_available(&f->exts)) { \
117 int r = tcf_exts_exec(skb, &f->exts, res); \
118 if (r < 0) { \
119 dont_cache = 1; \
120 continue; \
121 } \
122 return r; \
123 } else if (!dont_cache) \
124 route4_set_fastmap(head, id, iif, f); \
125 return 0; \
126}
127
128static int route4_classify(struct sk_buff *skb, const struct tcf_proto *tp,
129 struct tcf_result *res)
130{
131 struct route4_head *head = (struct route4_head *)tp->root;
132 struct dst_entry *dst;
133 struct route4_bucket *b;
134 struct route4_filter *f;
135 u32 id, h;
136 int iif, dont_cache = 0;
137
138 dst = skb_dst(skb);
139 if (!dst)
140 goto failure;
141
142 id = dst->tclassid;
143 if (head == NULL)
144 goto old_method;
145
146 iif = inet_iif(skb);
147
148 h = route4_fastmap_hash(id, iif);
149 if (id == head->fastmap[h].id &&
150 iif == head->fastmap[h].iif &&
151 (f = head->fastmap[h].filter) != NULL) {
152 if (f == ROUTE4_FAILURE)
153 goto failure;
154
155 *res = f->res;
156 return 0;
157 }
158
159 h = route4_hash_to(id);
160
161restart:
162 b = head->table[h];
163 if (b) {
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
201 if (id & 0x8000)
202 h += 256;
203 return h;
204}
205
206static inline u32 from_hash(u32 id)
207{
208 id &= 0xFFFF;
209 if (id == 0xFFFF)
210 return 32;
211 if (!(id & 0x8000)) {
212 if (id > 255)
213 return 256;
214 return id & 0xF;
215 }
216 return 16 + (id & 0xF);
217}
218
219static unsigned long route4_get(struct tcf_proto *tp, u32 handle)
220{
221 struct route4_head *head = (struct route4_head *)tp->root;
222 struct route4_bucket *b;
223 struct route4_filter *f;
224 unsigned int h1, h2;
225
226 if (!head)
227 return 0;
228
229 h1 = to_hash(handle);
230 if (h1 > 256)
231 return 0;
232
233 h2 = from_hash(handle >> 16);
234 if (h2 > 32)
235 return 0;
236
237 b = head->table[h1];
238 if (b) {
239 for (f = b->ht[h2]; f; f = f->next)
240 if (f->handle == handle)
241 return (unsigned long)f;
242 }
243 return 0;
244}
245
246static void route4_put(struct tcf_proto *tp, unsigned long f)
247{
248}
249
250static int route4_init(struct tcf_proto *tp)
251{
252 return 0;
253}
254
255static void
256route4_delete_filter(struct tcf_proto *tp, struct route4_filter *f)
257{
258 tcf_unbind_filter(tp, &f->res);
259 tcf_exts_destroy(tp, &f->exts);
260 kfree(f);
261}
262
263static void route4_destroy(struct tcf_proto *tp)
264{
265 struct route4_head *head = tp->root;
266 int h1, h2;
267
268 if (head == NULL)
269 return;
270
271 for (h1 = 0; h1 <= 256; h1++) {
272 struct route4_bucket *b;
273
274 b = head->table[h1];
275 if (b) {
276 for (h2 = 0; h2 <= 32; h2++) {
277 struct route4_filter *f;
278
279 while ((f = b->ht[h2]) != NULL) {
280 b->ht[h2] = f->next;
281 route4_delete_filter(tp, f);
282 }
283 }
284 kfree(b);
285 }
286 }
287 kfree(head);
288}
289
290static int route4_delete(struct tcf_proto *tp, unsigned long arg)
291{
292 struct route4_head *head = (struct route4_head *)tp->root;
293 struct route4_filter **fp, *f = (struct route4_filter *)arg;
294 unsigned int h = 0;
295 struct route4_bucket *b;
296 int i;
297
298 if (!head || !f)
299 return -EINVAL;
300
301 h = f->handle;
302 b = f->bkt;
303
304 for (fp = &b->ht[from_hash(h >> 16)]; *fp; fp = &(*fp)->next) {
305 if (*fp == f) {
306 tcf_tree_lock(tp);
307 *fp = f->next;
308 tcf_tree_unlock(tp);
309
310 route4_reset_fastmap(tp->q, head, f->id);
311 route4_delete_filter(tp, f);
312
313
314
315 for (i = 0; i <= 32; i++)
316 if (b->ht[i])
317 return 0;
318
319
320 tcf_tree_lock(tp);
321 head->table[to_hash(h)] = NULL;
322 tcf_tree_unlock(tp);
323
324 kfree(b);
325 return 0;
326 }
327 }
328 return 0;
329}
330
331static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = {
332 [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 },
333 [TCA_ROUTE4_TO] = { .type = NLA_U32 },
334 [TCA_ROUTE4_FROM] = { .type = NLA_U32 },
335 [TCA_ROUTE4_IIF] = { .type = NLA_U32 },
336};
337
338static int route4_set_parms(struct net *net, struct tcf_proto *tp,
339 unsigned long base, struct route4_filter *f,
340 u32 handle, struct route4_head *head,
341 struct nlattr **tb, struct nlattr *est, int new)
342{
343 int err;
344 u32 id = 0, to = 0, nhandle = 0x8000;
345 struct route4_filter *fp;
346 unsigned int h1;
347 struct route4_bucket *b;
348 struct tcf_exts e;
349
350 err = tcf_exts_validate(net, tp, tb, est, &e, &route_ext_map);
351 if (err < 0)
352 return err;
353
354 err = -EINVAL;
355 if (tb[TCA_ROUTE4_TO]) {
356 if (new && handle & 0x8000)
357 goto errout;
358 to = nla_get_u32(tb[TCA_ROUTE4_TO]);
359 if (to > 0xFF)
360 goto errout;
361 nhandle = to;
362 }
363
364 if (tb[TCA_ROUTE4_FROM]) {
365 if (tb[TCA_ROUTE4_IIF])
366 goto errout;
367 id = nla_get_u32(tb[TCA_ROUTE4_FROM]);
368 if (id > 0xFF)
369 goto errout;
370 nhandle |= id << 16;
371 } else if (tb[TCA_ROUTE4_IIF]) {
372 id = nla_get_u32(tb[TCA_ROUTE4_IIF]);
373 if (id > 0x7FFF)
374 goto errout;
375 nhandle |= (id | 0x8000) << 16;
376 } else
377 nhandle |= 0xFFFF << 16;
378
379 if (handle && new) {
380 nhandle |= handle & 0x7F00;
381 if (nhandle != handle)
382 goto errout;
383 }
384
385 h1 = to_hash(nhandle);
386 b = head->table[h1];
387 if (!b) {
388 err = -ENOBUFS;
389 b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
390 if (b == NULL)
391 goto errout;
392
393 tcf_tree_lock(tp);
394 head->table[h1] = b;
395 tcf_tree_unlock(tp);
396 } else {
397 unsigned int h2 = from_hash(nhandle >> 16);
398
399 err = -EEXIST;
400 for (fp = b->ht[h2]; fp; fp = fp->next)
401 if (fp->handle == f->handle)
402 goto errout;
403 }
404
405 tcf_tree_lock(tp);
406 if (tb[TCA_ROUTE4_TO])
407 f->id = to;
408
409 if (tb[TCA_ROUTE4_FROM])
410 f->id = to | id<<16;
411 else if (tb[TCA_ROUTE4_IIF])
412 f->iif = id;
413
414 f->handle = nhandle;
415 f->bkt = b;
416 tcf_tree_unlock(tp);
417
418 if (tb[TCA_ROUTE4_CLASSID]) {
419 f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]);
420 tcf_bind_filter(tp, &f->res, base);
421 }
422
423 tcf_exts_change(tp, &f->exts, &e);
424
425 return 0;
426errout:
427 tcf_exts_destroy(tp, &e);
428 return err;
429}
430
431static int route4_change(struct net *net, struct sk_buff *in_skb,
432 struct tcf_proto *tp, unsigned long base,
433 u32 handle,
434 struct nlattr **tca,
435 unsigned long *arg)
436{
437 struct route4_head *head = tp->root;
438 struct route4_filter *f, *f1, **fp;
439 struct route4_bucket *b;
440 struct nlattr *opt = tca[TCA_OPTIONS];
441 struct nlattr *tb[TCA_ROUTE4_MAX + 1];
442 unsigned int h, th;
443 u32 old_handle = 0;
444 int err;
445
446 if (opt == NULL)
447 return handle ? -EINVAL : 0;
448
449 err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy);
450 if (err < 0)
451 return err;
452
453 f = (struct route4_filter *)*arg;
454 if (f) {
455 if (f->handle != handle && handle)
456 return -EINVAL;
457
458 if (f->bkt)
459 old_handle = f->handle;
460
461 err = route4_set_parms(net, tp, base, f, handle, head, tb,
462 tca[TCA_RATE], 0);
463 if (err < 0)
464 return err;
465
466 goto reinsert;
467 }
468
469 err = -ENOBUFS;
470 if (head == NULL) {
471 head = kzalloc(sizeof(struct route4_head), GFP_KERNEL);
472 if (head == NULL)
473 goto errout;
474
475 tcf_tree_lock(tp);
476 tp->root = head;
477 tcf_tree_unlock(tp);
478 }
479
480 f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL);
481 if (f == NULL)
482 goto errout;
483
484 err = route4_set_parms(net, tp, base, f, handle, head, tb,
485 tca[TCA_RATE], 1);
486 if (err < 0)
487 goto errout;
488
489reinsert:
490 h = from_hash(f->handle >> 16);
491 for (fp = &f->bkt->ht[h]; (f1 = *fp) != NULL; fp = &f1->next)
492 if (f->handle < f1->handle)
493 break;
494
495 f->next = f1;
496 tcf_tree_lock(tp);
497 *fp = f;
498
499 if (old_handle && f->handle != old_handle) {
500 th = to_hash(old_handle);
501 h = from_hash(old_handle >> 16);
502 b = head->table[th];
503 if (b) {
504 for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) {
505 if (*fp == f) {
506 *fp = f->next;
507 break;
508 }
509 }
510 }
511 }
512 tcf_tree_unlock(tp);
513
514 route4_reset_fastmap(tp->q, head, f->id);
515 *arg = (unsigned long)f;
516 return 0;
517
518errout:
519 kfree(f);
520 return err;
521}
522
523static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
524{
525 struct route4_head *head = tp->root;
526 unsigned int h, h1;
527
528 if (head == NULL)
529 arg->stop = 1;
530
531 if (arg->stop)
532 return;
533
534 for (h = 0; h <= 256; h++) {
535 struct route4_bucket *b = head->table[h];
536
537 if (b) {
538 for (h1 = 0; h1 <= 32; h1++) {
539 struct route4_filter *f;
540
541 for (f = b->ht[h1]; f; f = f->next) {
542 if (arg->count < arg->skip) {
543 arg->count++;
544 continue;
545 }
546 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
547 arg->stop = 1;
548 return;
549 }
550 arg->count++;
551 }
552 }
553 }
554 }
555}
556
557static int route4_dump(struct tcf_proto *tp, unsigned long fh,
558 struct sk_buff *skb, struct tcmsg *t)
559{
560 struct route4_filter *f = (struct route4_filter *)fh;
561 unsigned char *b = skb_tail_pointer(skb);
562 struct nlattr *nest;
563 u32 id;
564
565 if (f == NULL)
566 return skb->len;
567
568 t->tcm_handle = f->handle;
569
570 nest = nla_nest_start(skb, TCA_OPTIONS);
571 if (nest == NULL)
572 goto nla_put_failure;
573
574 if (!(f->handle & 0x8000)) {
575 id = f->id & 0xFF;
576 if (nla_put_u32(skb, TCA_ROUTE4_TO, id))
577 goto nla_put_failure;
578 }
579 if (f->handle & 0x80000000) {
580 if ((f->handle >> 16) != 0xFFFF &&
581 nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif))
582 goto nla_put_failure;
583 } else {
584 id = f->id >> 16;
585 if (nla_put_u32(skb, TCA_ROUTE4_FROM, id))
586 goto nla_put_failure;
587 }
588 if (f->res.classid &&
589 nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid))
590 goto nla_put_failure;
591
592 if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0)
593 goto nla_put_failure;
594
595 nla_nest_end(skb, nest);
596
597 if (tcf_exts_dump_stats(skb, &f->exts, &route_ext_map) < 0)
598 goto nla_put_failure;
599
600 return skb->len;
601
602nla_put_failure:
603 nlmsg_trim(skb, b);
604 return -1;
605}
606
607static struct tcf_proto_ops cls_route4_ops __read_mostly = {
608 .kind = "route",
609 .classify = route4_classify,
610 .init = route4_init,
611 .destroy = route4_destroy,
612 .get = route4_get,
613 .put = route4_put,
614 .change = route4_change,
615 .delete = route4_delete,
616 .walk = route4_walk,
617 .dump = route4_dump,
618 .owner = THIS_MODULE,
619};
620
621static int __init init_route4(void)
622{
623 return register_tcf_proto_ops(&cls_route4_ops);
624}
625
626static void __exit exit_route4(void)
627{
628 unregister_tcf_proto_ops(&cls_route4_ops);
629}
630
631module_init(init_route4)
632module_exit(exit_route4)
633MODULE_LICENSE("GPL");
634
