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1/*
2 * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
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 * The filters are packed to hash tables of key nodes
12 * with a set of 32bit key/mask pairs at every node.
13 * Nodes reference next level hash tables etc.
14 *
15 * This scheme is the best universal classifier I managed to
16 * invent; it is not super-fast, but it is not slow (provided you
17 * program it correctly), and general enough. And its relative
18 * speed grows as the number of rules becomes larger.
19 *
20 * It seems that it represents the best middle point between
21 * speed and manageability both by human and by machine.
22 *
23 * It is especially useful for link sharing combined with QoS;
24 * pure RSVP doesn't need such a general approach and can use
25 * much simpler (and faster) schemes, sort of cls_rsvp.c.
26 *
27 * JHS: We should remove the CONFIG_NET_CLS_IND from here
28 * eventually when the meta match extension is made available
29 *
30 * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
31 */
32
33#include <linux/module.h>
34#include <linux/slab.h>
35#include <linux/types.h>
36#include <linux/kernel.h>
37#include <linux/string.h>
38#include <linux/errno.h>
39#include <linux/rtnetlink.h>
40#include <linux/skbuff.h>
41#include <net/netlink.h>
42#include <net/act_api.h>
43#include <net/pkt_cls.h>
44
45struct tc_u_knode {
46 struct tc_u_knode *next;
47 u32 handle;
48 struct tc_u_hnode *ht_up;
49 struct tcf_exts exts;
50#ifdef CONFIG_NET_CLS_IND
51 char indev[IFNAMSIZ];
52#endif
53 u8 fshift;
54 struct tcf_result res;
55 struct tc_u_hnode *ht_down;
56#ifdef CONFIG_CLS_U32_PERF
57 struct tc_u32_pcnt *pf;
58#endif
59#ifdef CONFIG_CLS_U32_MARK
60 struct tc_u32_mark mark;
61#endif
62 struct tc_u32_sel sel;
63};
64
65struct tc_u_hnode {
66 struct tc_u_hnode *next;
67 u32 handle;
68 u32 prio;
69 struct tc_u_common *tp_c;
70 int refcnt;
71 unsigned int divisor;
72 struct tc_u_knode *ht[1];
73};
74
75struct tc_u_common {
76 struct tc_u_hnode *hlist;
77 struct Qdisc *q;
78 int refcnt;
79 u32 hgenerator;
80};
81
82static const struct tcf_ext_map u32_ext_map = {
83 .action = TCA_U32_ACT,
84 .police = TCA_U32_POLICE
85};
86
87static inline unsigned int u32_hash_fold(__be32 key,
88 const struct tc_u32_sel *sel,
89 u8 fshift)
90{
91 unsigned int h = ntohl(key & sel->hmask) >> fshift;
92
93 return h;
94}
95
96static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
97{
98 struct {
99 struct tc_u_knode *knode;
100 unsigned int off;
101 } stack[TC_U32_MAXDEPTH];
102
103 struct tc_u_hnode *ht = (struct tc_u_hnode *)tp->root;
104 unsigned int off = skb_network_offset(skb);
105 struct tc_u_knode *n;
106 int sdepth = 0;
107 int off2 = 0;
108 int sel = 0;
109#ifdef CONFIG_CLS_U32_PERF
110 int j;
111#endif
112 int i, r;
113
114next_ht:
115 n = ht->ht[sel];
116
117next_knode:
118 if (n) {
119 struct tc_u32_key *key = n->sel.keys;
120
121#ifdef CONFIG_CLS_U32_PERF
122 n->pf->rcnt += 1;
123 j = 0;
124#endif
125
126#ifdef CONFIG_CLS_U32_MARK
127 if ((skb->mark & n->mark.mask) != n->mark.val) {
128 n = n->next;
129 goto next_knode;
130 } else {
131 n->mark.success++;
132 }
133#endif
134
135 for (i = n->sel.nkeys; i > 0; i--, key++) {
136 int toff = off + key->off + (off2 & key->offmask);
137 __be32 *data, hdata;
138
139 if (skb_headroom(skb) + toff > INT_MAX)
140 goto out;
141
142 data = skb_header_pointer(skb, toff, 4, &hdata);
143 if (!data)
144 goto out;
145 if ((*data ^ key->val) & key->mask) {
146 n = n->next;
147 goto next_knode;
148 }
149#ifdef CONFIG_CLS_U32_PERF
150 n->pf->kcnts[j] += 1;
151 j++;
152#endif
153 }
154 if (n->ht_down == NULL) {
155check_terminal:
156 if (n->sel.flags & TC_U32_TERMINAL) {
157
158 *res = n->res;
159#ifdef CONFIG_NET_CLS_IND
160 if (!tcf_match_indev(skb, n->indev)) {
161 n = n->next;
162 goto next_knode;
163 }
164#endif
165#ifdef CONFIG_CLS_U32_PERF
166 n->pf->rhit += 1;
167#endif
168 r = tcf_exts_exec(skb, &n->exts, res);
169 if (r < 0) {
170 n = n->next;
171 goto next_knode;
172 }
173
174 return r;
175 }
176 n = n->next;
177 goto next_knode;
178 }
179
180 /* PUSH */
181 if (sdepth >= TC_U32_MAXDEPTH)
182 goto deadloop;
183 stack[sdepth].knode = n;
184 stack[sdepth].off = off;
185 sdepth++;
186
187 ht = n->ht_down;
188 sel = 0;
189 if (ht->divisor) {
190 __be32 *data, hdata;
191
192 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
193 &hdata);
194 if (!data)
195 goto out;
196 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
197 n->fshift);
198 }
199 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
200 goto next_ht;
201
202 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
203 off2 = n->sel.off + 3;
204 if (n->sel.flags & TC_U32_VAROFFSET) {
205 __be16 *data, hdata;
206
207 data = skb_header_pointer(skb,
208 off + n->sel.offoff,
209 2, &hdata);
210 if (!data)
211 goto out;
212 off2 += ntohs(n->sel.offmask & *data) >>
213 n->sel.offshift;
214 }
215 off2 &= ~3;
216 }
217 if (n->sel.flags & TC_U32_EAT) {
218 off += off2;
219 off2 = 0;
220 }
221
222 if (off < skb->len)
223 goto next_ht;
224 }
225
226 /* POP */
227 if (sdepth--) {
228 n = stack[sdepth].knode;
229 ht = n->ht_up;
230 off = stack[sdepth].off;
231 goto check_terminal;
232 }
233out:
234 return -1;
235
236deadloop:
237 net_warn_ratelimited("cls_u32: dead loop\n");
238 return -1;
239}
240
241static struct tc_u_hnode *
242u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
243{
244 struct tc_u_hnode *ht;
245
246 for (ht = tp_c->hlist; ht; ht = ht->next)
247 if (ht->handle == handle)
248 break;
249
250 return ht;
251}
252
253static struct tc_u_knode *
254u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
255{
256 unsigned int sel;
257 struct tc_u_knode *n = NULL;
258
259 sel = TC_U32_HASH(handle);
260 if (sel > ht->divisor)
261 goto out;
262
263 for (n = ht->ht[sel]; n; n = n->next)
264 if (n->handle == handle)
265 break;
266out:
267 return n;
268}
269
270
271static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
272{
273 struct tc_u_hnode *ht;
274 struct tc_u_common *tp_c = tp->data;
275
276 if (TC_U32_HTID(handle) == TC_U32_ROOT)
277 ht = tp->root;
278 else
279 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
280
281 if (!ht)
282 return 0;
283
284 if (TC_U32_KEY(handle) == 0)
285 return (unsigned long)ht;
286
287 return (unsigned long)u32_lookup_key(ht, handle);
288}
289
290static void u32_put(struct tcf_proto *tp, unsigned long f)
291{
292}
293
294static u32 gen_new_htid(struct tc_u_common *tp_c)
295{
296 int i = 0x800;
297
298 do {
299 if (++tp_c->hgenerator == 0x7FF)
300 tp_c->hgenerator = 1;
301 } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
302
303 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
304}
305
306static int u32_init(struct tcf_proto *tp)
307{
308 struct tc_u_hnode *root_ht;
309 struct tc_u_common *tp_c;
310
311 tp_c = tp->q->u32_node;
312
313 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
314 if (root_ht == NULL)
315 return -ENOBUFS;
316
317 root_ht->divisor = 0;
318 root_ht->refcnt++;
319 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
320 root_ht->prio = tp->prio;
321
322 if (tp_c == NULL) {
323 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
324 if (tp_c == NULL) {
325 kfree(root_ht);
326 return -ENOBUFS;
327 }
328 tp_c->q = tp->q;
329 tp->q->u32_node = tp_c;
330 }
331
332 tp_c->refcnt++;
333 root_ht->next = tp_c->hlist;
334 tp_c->hlist = root_ht;
335 root_ht->tp_c = tp_c;
336
337 tp->root = root_ht;
338 tp->data = tp_c;
339 return 0;
340}
341
342static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
343{
344 tcf_unbind_filter(tp, &n->res);
345 tcf_exts_destroy(tp, &n->exts);
346 if (n->ht_down)
347 n->ht_down->refcnt--;
348#ifdef CONFIG_CLS_U32_PERF
349 kfree(n->pf);
350#endif
351 kfree(n);
352 return 0;
353}
354
355static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
356{
357 struct tc_u_knode **kp;
358 struct tc_u_hnode *ht = key->ht_up;
359
360 if (ht) {
361 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
362 if (*kp == key) {
363 tcf_tree_lock(tp);
364 *kp = key->next;
365 tcf_tree_unlock(tp);
366
367 u32_destroy_key(tp, key);
368 return 0;
369 }
370 }
371 }
372 WARN_ON(1);
373 return 0;
374}
375
376static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
377{
378 struct tc_u_knode *n;
379 unsigned int h;
380
381 for (h = 0; h <= ht->divisor; h++) {
382 while ((n = ht->ht[h]) != NULL) {
383 ht->ht[h] = n->next;
384
385 u32_destroy_key(tp, n);
386 }
387 }
388}
389
390static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
391{
392 struct tc_u_common *tp_c = tp->data;
393 struct tc_u_hnode **hn;
394
395 WARN_ON(ht->refcnt);
396
397 u32_clear_hnode(tp, ht);
398
399 for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
400 if (*hn == ht) {
401 *hn = ht->next;
402 kfree(ht);
403 return 0;
404 }
405 }
406
407 WARN_ON(1);
408 return -ENOENT;
409}
410
411static void u32_destroy(struct tcf_proto *tp)
412{
413 struct tc_u_common *tp_c = tp->data;
414 struct tc_u_hnode *root_ht = tp->root;
415
416 WARN_ON(root_ht == NULL);
417
418 if (root_ht && --root_ht->refcnt == 0)
419 u32_destroy_hnode(tp, root_ht);
420
421 if (--tp_c->refcnt == 0) {
422 struct tc_u_hnode *ht;
423
424 tp->q->u32_node = NULL;
425
426 for (ht = tp_c->hlist; ht; ht = ht->next) {
427 ht->refcnt--;
428 u32_clear_hnode(tp, ht);
429 }
430
431 while ((ht = tp_c->hlist) != NULL) {
432 tp_c->hlist = ht->next;
433
434 WARN_ON(ht->refcnt != 0);
435
436 kfree(ht);
437 }
438
439 kfree(tp_c);
440 }
441
442 tp->data = NULL;
443}
444
445static int u32_delete(struct tcf_proto *tp, unsigned long arg)
446{
447 struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
448
449 if (ht == NULL)
450 return 0;
451
452 if (TC_U32_KEY(ht->handle))
453 return u32_delete_key(tp, (struct tc_u_knode *)ht);
454
455 if (tp->root == ht)
456 return -EINVAL;
457
458 if (ht->refcnt == 1) {
459 ht->refcnt--;
460 u32_destroy_hnode(tp, ht);
461 } else {
462 return -EBUSY;
463 }
464
465 return 0;
466}
467
468static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
469{
470 struct tc_u_knode *n;
471 unsigned int i = 0x7FF;
472
473 for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
474 if (i < TC_U32_NODE(n->handle))
475 i = TC_U32_NODE(n->handle);
476 i++;
477
478 return handle | (i > 0xFFF ? 0xFFF : i);
479}
480
481static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
482 [TCA_U32_CLASSID] = { .type = NLA_U32 },
483 [TCA_U32_HASH] = { .type = NLA_U32 },
484 [TCA_U32_LINK] = { .type = NLA_U32 },
485 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
486 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
487 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
488 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
489};
490
491static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
492 struct tc_u_hnode *ht,
493 struct tc_u_knode *n, struct nlattr **tb,
494 struct nlattr *est)
495{
496 int err;
497 struct tcf_exts e;
498
499 err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
500 if (err < 0)
501 return err;
502
503 err = -EINVAL;
504 if (tb[TCA_U32_LINK]) {
505 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
506 struct tc_u_hnode *ht_down = NULL, *ht_old;
507
508 if (TC_U32_KEY(handle))
509 goto errout;
510
511 if (handle) {
512 ht_down = u32_lookup_ht(ht->tp_c, handle);
513
514 if (ht_down == NULL)
515 goto errout;
516 ht_down->refcnt++;
517 }
518
519 tcf_tree_lock(tp);
520 ht_old = n->ht_down;
521 n->ht_down = ht_down;
522 tcf_tree_unlock(tp);
523
524 if (ht_old)
525 ht_old->refcnt--;
526 }
527 if (tb[TCA_U32_CLASSID]) {
528 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
529 tcf_bind_filter(tp, &n->res, base);
530 }
531
532#ifdef CONFIG_NET_CLS_IND
533 if (tb[TCA_U32_INDEV]) {
534 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
535 if (err < 0)
536 goto errout;
537 }
538#endif
539 tcf_exts_change(tp, &n->exts, &e);
540
541 return 0;
542errout:
543 tcf_exts_destroy(tp, &e);
544 return err;
545}
546
547static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
548 struct nlattr **tca,
549 unsigned long *arg)
550{
551 struct tc_u_common *tp_c = tp->data;
552 struct tc_u_hnode *ht;
553 struct tc_u_knode *n;
554 struct tc_u32_sel *s;
555 struct nlattr *opt = tca[TCA_OPTIONS];
556 struct nlattr *tb[TCA_U32_MAX + 1];
557 u32 htid;
558 int err;
559
560 if (opt == NULL)
561 return handle ? -EINVAL : 0;
562
563 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
564 if (err < 0)
565 return err;
566
567 n = (struct tc_u_knode *)*arg;
568 if (n) {
569 if (TC_U32_KEY(n->handle) == 0)
570 return -EINVAL;
571
572 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
573 }
574
575 if (tb[TCA_U32_DIVISOR]) {
576 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
577
578 if (--divisor > 0x100)
579 return -EINVAL;
580 if (TC_U32_KEY(handle))
581 return -EINVAL;
582 if (handle == 0) {
583 handle = gen_new_htid(tp->data);
584 if (handle == 0)
585 return -ENOMEM;
586 }
587 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
588 if (ht == NULL)
589 return -ENOBUFS;
590 ht->tp_c = tp_c;
591 ht->refcnt = 1;
592 ht->divisor = divisor;
593 ht->handle = handle;
594 ht->prio = tp->prio;
595 ht->next = tp_c->hlist;
596 tp_c->hlist = ht;
597 *arg = (unsigned long)ht;
598 return 0;
599 }
600
601 if (tb[TCA_U32_HASH]) {
602 htid = nla_get_u32(tb[TCA_U32_HASH]);
603 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
604 ht = tp->root;
605 htid = ht->handle;
606 } else {
607 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
608 if (ht == NULL)
609 return -EINVAL;
610 }
611 } else {
612 ht = tp->root;
613 htid = ht->handle;
614 }
615
616 if (ht->divisor < TC_U32_HASH(htid))
617 return -EINVAL;
618
619 if (handle) {
620 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
621 return -EINVAL;
622 handle = htid | TC_U32_NODE(handle);
623 } else
624 handle = gen_new_kid(ht, htid);
625
626 if (tb[TCA_U32_SEL] == NULL)
627 return -EINVAL;
628
629 s = nla_data(tb[TCA_U32_SEL]);
630
631 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
632 if (n == NULL)
633 return -ENOBUFS;
634
635#ifdef CONFIG_CLS_U32_PERF
636 n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
637 if (n->pf == NULL) {
638 kfree(n);
639 return -ENOBUFS;
640 }
641#endif
642
643 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
644 n->ht_up = ht;
645 n->handle = handle;
646 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
647
648#ifdef CONFIG_CLS_U32_MARK
649 if (tb[TCA_U32_MARK]) {
650 struct tc_u32_mark *mark;
651
652 mark = nla_data(tb[TCA_U32_MARK]);
653 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
654 n->mark.success = 0;
655 }
656#endif
657
658 err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
659 if (err == 0) {
660 struct tc_u_knode **ins;
661 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
662 if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
663 break;
664
665 n->next = *ins;
666 tcf_tree_lock(tp);
667 *ins = n;
668 tcf_tree_unlock(tp);
669
670 *arg = (unsigned long)n;
671 return 0;
672 }
673#ifdef CONFIG_CLS_U32_PERF
674 kfree(n->pf);
675#endif
676 kfree(n);
677 return err;
678}
679
680static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
681{
682 struct tc_u_common *tp_c = tp->data;
683 struct tc_u_hnode *ht;
684 struct tc_u_knode *n;
685 unsigned int h;
686
687 if (arg->stop)
688 return;
689
690 for (ht = tp_c->hlist; ht; ht = ht->next) {
691 if (ht->prio != tp->prio)
692 continue;
693 if (arg->count >= arg->skip) {
694 if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
695 arg->stop = 1;
696 return;
697 }
698 }
699 arg->count++;
700 for (h = 0; h <= ht->divisor; h++) {
701 for (n = ht->ht[h]; n; n = n->next) {
702 if (arg->count < arg->skip) {
703 arg->count++;
704 continue;
705 }
706 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
707 arg->stop = 1;
708 return;
709 }
710 arg->count++;
711 }
712 }
713 }
714}
715
716static int u32_dump(struct tcf_proto *tp, unsigned long fh,
717 struct sk_buff *skb, struct tcmsg *t)
718{
719 struct tc_u_knode *n = (struct tc_u_knode *)fh;
720 struct nlattr *nest;
721
722 if (n == NULL)
723 return skb->len;
724
725 t->tcm_handle = n->handle;
726
727 nest = nla_nest_start(skb, TCA_OPTIONS);
728 if (nest == NULL)
729 goto nla_put_failure;
730
731 if (TC_U32_KEY(n->handle) == 0) {
732 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
733 u32 divisor = ht->divisor + 1;
734
735 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
736 goto nla_put_failure;
737 } else {
738 if (nla_put(skb, TCA_U32_SEL,
739 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
740 &n->sel))
741 goto nla_put_failure;
742 if (n->ht_up) {
743 u32 htid = n->handle & 0xFFFFF000;
744 if (nla_put_u32(skb, TCA_U32_HASH, htid))
745 goto nla_put_failure;
746 }
747 if (n->res.classid &&
748 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
749 goto nla_put_failure;
750 if (n->ht_down &&
751 nla_put_u32(skb, TCA_U32_LINK, n->ht_down->handle))
752 goto nla_put_failure;
753
754#ifdef CONFIG_CLS_U32_MARK
755 if ((n->mark.val || n->mark.mask) &&
756 nla_put(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark))
757 goto nla_put_failure;
758#endif
759
760 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
761 goto nla_put_failure;
762
763#ifdef CONFIG_NET_CLS_IND
764 if (strlen(n->indev) &&
765 nla_put_string(skb, TCA_U32_INDEV, n->indev))
766 goto nla_put_failure;
767#endif
768#ifdef CONFIG_CLS_U32_PERF
769 if (nla_put(skb, TCA_U32_PCNT,
770 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
771 n->pf))
772 goto nla_put_failure;
773#endif
774 }
775
776 nla_nest_end(skb, nest);
777
778 if (TC_U32_KEY(n->handle))
779 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
780 goto nla_put_failure;
781 return skb->len;
782
783nla_put_failure:
784 nla_nest_cancel(skb, nest);
785 return -1;
786}
787
788static struct tcf_proto_ops cls_u32_ops __read_mostly = {
789 .kind = "u32",
790 .classify = u32_classify,
791 .init = u32_init,
792 .destroy = u32_destroy,
793 .get = u32_get,
794 .put = u32_put,
795 .change = u32_change,
796 .delete = u32_delete,
797 .walk = u32_walk,
798 .dump = u32_dump,
799 .owner = THIS_MODULE,
800};
801
802static int __init init_u32(void)
803{
804 pr_info("u32 classifier\n");
805#ifdef CONFIG_CLS_U32_PERF
806 pr_info(" Performance counters on\n");
807#endif
808#ifdef CONFIG_NET_CLS_IND
809 pr_info(" input device check on\n");
810#endif
811#ifdef CONFIG_NET_CLS_ACT
812 pr_info(" Actions configured\n");
813#endif
814 return register_tcf_proto_ops(&cls_u32_ops);
815}
816
817static void __exit exit_u32(void)
818{
819 unregister_tcf_proto_ops(&cls_u32_ops);
820}
821
822module_init(init_u32)
823module_exit(exit_u32)
824MODULE_LICENSE("GPL");
1/*
2 * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
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 * The filters are packed to hash tables of key nodes
12 * with a set of 32bit key/mask pairs at every node.
13 * Nodes reference next level hash tables etc.
14 *
15 * This scheme is the best universal classifier I managed to
16 * invent; it is not super-fast, but it is not slow (provided you
17 * program it correctly), and general enough. And its relative
18 * speed grows as the number of rules becomes larger.
19 *
20 * It seems that it represents the best middle point between
21 * speed and manageability both by human and by machine.
22 *
23 * It is especially useful for link sharing combined with QoS;
24 * pure RSVP doesn't need such a general approach and can use
25 * much simpler (and faster) schemes, sort of cls_rsvp.c.
26 *
27 * JHS: We should remove the CONFIG_NET_CLS_IND from here
28 * eventually when the meta match extension is made available
29 *
30 * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
31 */
32
33#include <linux/module.h>
34#include <linux/slab.h>
35#include <linux/types.h>
36#include <linux/kernel.h>
37#include <linux/string.h>
38#include <linux/errno.h>
39#include <linux/rtnetlink.h>
40#include <linux/skbuff.h>
41#include <net/netlink.h>
42#include <net/act_api.h>
43#include <net/pkt_cls.h>
44
45struct tc_u_knode {
46 struct tc_u_knode *next;
47 u32 handle;
48 struct tc_u_hnode *ht_up;
49 struct tcf_exts exts;
50#ifdef CONFIG_NET_CLS_IND
51 char indev[IFNAMSIZ];
52#endif
53 u8 fshift;
54 struct tcf_result res;
55 struct tc_u_hnode *ht_down;
56#ifdef CONFIG_CLS_U32_PERF
57 struct tc_u32_pcnt *pf;
58#endif
59#ifdef CONFIG_CLS_U32_MARK
60 struct tc_u32_mark mark;
61#endif
62 struct tc_u32_sel sel;
63};
64
65struct tc_u_hnode {
66 struct tc_u_hnode *next;
67 u32 handle;
68 u32 prio;
69 struct tc_u_common *tp_c;
70 int refcnt;
71 unsigned int divisor;
72 struct tc_u_knode *ht[1];
73};
74
75struct tc_u_common {
76 struct tc_u_hnode *hlist;
77 struct Qdisc *q;
78 int refcnt;
79 u32 hgenerator;
80};
81
82static const struct tcf_ext_map u32_ext_map = {
83 .action = TCA_U32_ACT,
84 .police = TCA_U32_POLICE
85};
86
87static inline unsigned int u32_hash_fold(__be32 key,
88 const struct tc_u32_sel *sel,
89 u8 fshift)
90{
91 unsigned int h = ntohl(key & sel->hmask) >> fshift;
92
93 return h;
94}
95
96static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
97{
98 struct {
99 struct tc_u_knode *knode;
100 unsigned int off;
101 } stack[TC_U32_MAXDEPTH];
102
103 struct tc_u_hnode *ht = (struct tc_u_hnode *)tp->root;
104 unsigned int off = skb_network_offset(skb);
105 struct tc_u_knode *n;
106 int sdepth = 0;
107 int off2 = 0;
108 int sel = 0;
109#ifdef CONFIG_CLS_U32_PERF
110 int j;
111#endif
112 int i, r;
113
114next_ht:
115 n = ht->ht[sel];
116
117next_knode:
118 if (n) {
119 struct tc_u32_key *key = n->sel.keys;
120
121#ifdef CONFIG_CLS_U32_PERF
122 n->pf->rcnt += 1;
123 j = 0;
124#endif
125
126#ifdef CONFIG_CLS_U32_MARK
127 if ((skb->mark & n->mark.mask) != n->mark.val) {
128 n = n->next;
129 goto next_knode;
130 } else {
131 n->mark.success++;
132 }
133#endif
134
135 for (i = n->sel.nkeys; i > 0; i--, key++) {
136 int toff = off + key->off + (off2 & key->offmask);
137 __be32 *data, hdata;
138
139 if (skb_headroom(skb) + toff > INT_MAX)
140 goto out;
141
142 data = skb_header_pointer(skb, toff, 4, &hdata);
143 if (!data)
144 goto out;
145 if ((*data ^ key->val) & key->mask) {
146 n = n->next;
147 goto next_knode;
148 }
149#ifdef CONFIG_CLS_U32_PERF
150 n->pf->kcnts[j] += 1;
151 j++;
152#endif
153 }
154 if (n->ht_down == NULL) {
155check_terminal:
156 if (n->sel.flags & TC_U32_TERMINAL) {
157
158 *res = n->res;
159#ifdef CONFIG_NET_CLS_IND
160 if (!tcf_match_indev(skb, n->indev)) {
161 n = n->next;
162 goto next_knode;
163 }
164#endif
165#ifdef CONFIG_CLS_U32_PERF
166 n->pf->rhit += 1;
167#endif
168 r = tcf_exts_exec(skb, &n->exts, res);
169 if (r < 0) {
170 n = n->next;
171 goto next_knode;
172 }
173
174 return r;
175 }
176 n = n->next;
177 goto next_knode;
178 }
179
180 /* PUSH */
181 if (sdepth >= TC_U32_MAXDEPTH)
182 goto deadloop;
183 stack[sdepth].knode = n;
184 stack[sdepth].off = off;
185 sdepth++;
186
187 ht = n->ht_down;
188 sel = 0;
189 if (ht->divisor) {
190 __be32 *data, hdata;
191
192 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
193 &hdata);
194 if (!data)
195 goto out;
196 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
197 n->fshift);
198 }
199 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
200 goto next_ht;
201
202 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
203 off2 = n->sel.off + 3;
204 if (n->sel.flags & TC_U32_VAROFFSET) {
205 __be16 *data, hdata;
206
207 data = skb_header_pointer(skb,
208 off + n->sel.offoff,
209 2, &hdata);
210 if (!data)
211 goto out;
212 off2 += ntohs(n->sel.offmask & *data) >>
213 n->sel.offshift;
214 }
215 off2 &= ~3;
216 }
217 if (n->sel.flags & TC_U32_EAT) {
218 off += off2;
219 off2 = 0;
220 }
221
222 if (off < skb->len)
223 goto next_ht;
224 }
225
226 /* POP */
227 if (sdepth--) {
228 n = stack[sdepth].knode;
229 ht = n->ht_up;
230 off = stack[sdepth].off;
231 goto check_terminal;
232 }
233out:
234 return -1;
235
236deadloop:
237 if (net_ratelimit())
238 pr_warning("cls_u32: dead loop\n");
239 return -1;
240}
241
242static struct tc_u_hnode *
243u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
244{
245 struct tc_u_hnode *ht;
246
247 for (ht = tp_c->hlist; ht; ht = ht->next)
248 if (ht->handle == handle)
249 break;
250
251 return ht;
252}
253
254static struct tc_u_knode *
255u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
256{
257 unsigned int sel;
258 struct tc_u_knode *n = NULL;
259
260 sel = TC_U32_HASH(handle);
261 if (sel > ht->divisor)
262 goto out;
263
264 for (n = ht->ht[sel]; n; n = n->next)
265 if (n->handle == handle)
266 break;
267out:
268 return n;
269}
270
271
272static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
273{
274 struct tc_u_hnode *ht;
275 struct tc_u_common *tp_c = tp->data;
276
277 if (TC_U32_HTID(handle) == TC_U32_ROOT)
278 ht = tp->root;
279 else
280 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
281
282 if (!ht)
283 return 0;
284
285 if (TC_U32_KEY(handle) == 0)
286 return (unsigned long)ht;
287
288 return (unsigned long)u32_lookup_key(ht, handle);
289}
290
291static void u32_put(struct tcf_proto *tp, unsigned long f)
292{
293}
294
295static u32 gen_new_htid(struct tc_u_common *tp_c)
296{
297 int i = 0x800;
298
299 do {
300 if (++tp_c->hgenerator == 0x7FF)
301 tp_c->hgenerator = 1;
302 } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
303
304 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
305}
306
307static int u32_init(struct tcf_proto *tp)
308{
309 struct tc_u_hnode *root_ht;
310 struct tc_u_common *tp_c;
311
312 tp_c = tp->q->u32_node;
313
314 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
315 if (root_ht == NULL)
316 return -ENOBUFS;
317
318 root_ht->divisor = 0;
319 root_ht->refcnt++;
320 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
321 root_ht->prio = tp->prio;
322
323 if (tp_c == NULL) {
324 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
325 if (tp_c == NULL) {
326 kfree(root_ht);
327 return -ENOBUFS;
328 }
329 tp_c->q = tp->q;
330 tp->q->u32_node = tp_c;
331 }
332
333 tp_c->refcnt++;
334 root_ht->next = tp_c->hlist;
335 tp_c->hlist = root_ht;
336 root_ht->tp_c = tp_c;
337
338 tp->root = root_ht;
339 tp->data = tp_c;
340 return 0;
341}
342
343static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
344{
345 tcf_unbind_filter(tp, &n->res);
346 tcf_exts_destroy(tp, &n->exts);
347 if (n->ht_down)
348 n->ht_down->refcnt--;
349#ifdef CONFIG_CLS_U32_PERF
350 kfree(n->pf);
351#endif
352 kfree(n);
353 return 0;
354}
355
356static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
357{
358 struct tc_u_knode **kp;
359 struct tc_u_hnode *ht = key->ht_up;
360
361 if (ht) {
362 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
363 if (*kp == key) {
364 tcf_tree_lock(tp);
365 *kp = key->next;
366 tcf_tree_unlock(tp);
367
368 u32_destroy_key(tp, key);
369 return 0;
370 }
371 }
372 }
373 WARN_ON(1);
374 return 0;
375}
376
377static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
378{
379 struct tc_u_knode *n;
380 unsigned int h;
381
382 for (h = 0; h <= ht->divisor; h++) {
383 while ((n = ht->ht[h]) != NULL) {
384 ht->ht[h] = n->next;
385
386 u32_destroy_key(tp, n);
387 }
388 }
389}
390
391static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
392{
393 struct tc_u_common *tp_c = tp->data;
394 struct tc_u_hnode **hn;
395
396 WARN_ON(ht->refcnt);
397
398 u32_clear_hnode(tp, ht);
399
400 for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
401 if (*hn == ht) {
402 *hn = ht->next;
403 kfree(ht);
404 return 0;
405 }
406 }
407
408 WARN_ON(1);
409 return -ENOENT;
410}
411
412static void u32_destroy(struct tcf_proto *tp)
413{
414 struct tc_u_common *tp_c = tp->data;
415 struct tc_u_hnode *root_ht = tp->root;
416
417 WARN_ON(root_ht == NULL);
418
419 if (root_ht && --root_ht->refcnt == 0)
420 u32_destroy_hnode(tp, root_ht);
421
422 if (--tp_c->refcnt == 0) {
423 struct tc_u_hnode *ht;
424
425 tp->q->u32_node = NULL;
426
427 for (ht = tp_c->hlist; ht; ht = ht->next) {
428 ht->refcnt--;
429 u32_clear_hnode(tp, ht);
430 }
431
432 while ((ht = tp_c->hlist) != NULL) {
433 tp_c->hlist = ht->next;
434
435 WARN_ON(ht->refcnt != 0);
436
437 kfree(ht);
438 }
439
440 kfree(tp_c);
441 }
442
443 tp->data = NULL;
444}
445
446static int u32_delete(struct tcf_proto *tp, unsigned long arg)
447{
448 struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
449
450 if (ht == NULL)
451 return 0;
452
453 if (TC_U32_KEY(ht->handle))
454 return u32_delete_key(tp, (struct tc_u_knode *)ht);
455
456 if (tp->root == ht)
457 return -EINVAL;
458
459 if (ht->refcnt == 1) {
460 ht->refcnt--;
461 u32_destroy_hnode(tp, ht);
462 } else {
463 return -EBUSY;
464 }
465
466 return 0;
467}
468
469static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
470{
471 struct tc_u_knode *n;
472 unsigned int i = 0x7FF;
473
474 for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
475 if (i < TC_U32_NODE(n->handle))
476 i = TC_U32_NODE(n->handle);
477 i++;
478
479 return handle | (i > 0xFFF ? 0xFFF : i);
480}
481
482static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
483 [TCA_U32_CLASSID] = { .type = NLA_U32 },
484 [TCA_U32_HASH] = { .type = NLA_U32 },
485 [TCA_U32_LINK] = { .type = NLA_U32 },
486 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
487 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
488 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
489 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
490};
491
492static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
493 struct tc_u_hnode *ht,
494 struct tc_u_knode *n, struct nlattr **tb,
495 struct nlattr *est)
496{
497 int err;
498 struct tcf_exts e;
499
500 err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
501 if (err < 0)
502 return err;
503
504 err = -EINVAL;
505 if (tb[TCA_U32_LINK]) {
506 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
507 struct tc_u_hnode *ht_down = NULL, *ht_old;
508
509 if (TC_U32_KEY(handle))
510 goto errout;
511
512 if (handle) {
513 ht_down = u32_lookup_ht(ht->tp_c, handle);
514
515 if (ht_down == NULL)
516 goto errout;
517 ht_down->refcnt++;
518 }
519
520 tcf_tree_lock(tp);
521 ht_old = n->ht_down;
522 n->ht_down = ht_down;
523 tcf_tree_unlock(tp);
524
525 if (ht_old)
526 ht_old->refcnt--;
527 }
528 if (tb[TCA_U32_CLASSID]) {
529 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
530 tcf_bind_filter(tp, &n->res, base);
531 }
532
533#ifdef CONFIG_NET_CLS_IND
534 if (tb[TCA_U32_INDEV]) {
535 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
536 if (err < 0)
537 goto errout;
538 }
539#endif
540 tcf_exts_change(tp, &n->exts, &e);
541
542 return 0;
543errout:
544 tcf_exts_destroy(tp, &e);
545 return err;
546}
547
548static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
549 struct nlattr **tca,
550 unsigned long *arg)
551{
552 struct tc_u_common *tp_c = tp->data;
553 struct tc_u_hnode *ht;
554 struct tc_u_knode *n;
555 struct tc_u32_sel *s;
556 struct nlattr *opt = tca[TCA_OPTIONS];
557 struct nlattr *tb[TCA_U32_MAX + 1];
558 u32 htid;
559 int err;
560
561 if (opt == NULL)
562 return handle ? -EINVAL : 0;
563
564 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
565 if (err < 0)
566 return err;
567
568 n = (struct tc_u_knode *)*arg;
569 if (n) {
570 if (TC_U32_KEY(n->handle) == 0)
571 return -EINVAL;
572
573 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
574 }
575
576 if (tb[TCA_U32_DIVISOR]) {
577 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
578
579 if (--divisor > 0x100)
580 return -EINVAL;
581 if (TC_U32_KEY(handle))
582 return -EINVAL;
583 if (handle == 0) {
584 handle = gen_new_htid(tp->data);
585 if (handle == 0)
586 return -ENOMEM;
587 }
588 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
589 if (ht == NULL)
590 return -ENOBUFS;
591 ht->tp_c = tp_c;
592 ht->refcnt = 1;
593 ht->divisor = divisor;
594 ht->handle = handle;
595 ht->prio = tp->prio;
596 ht->next = tp_c->hlist;
597 tp_c->hlist = ht;
598 *arg = (unsigned long)ht;
599 return 0;
600 }
601
602 if (tb[TCA_U32_HASH]) {
603 htid = nla_get_u32(tb[TCA_U32_HASH]);
604 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
605 ht = tp->root;
606 htid = ht->handle;
607 } else {
608 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
609 if (ht == NULL)
610 return -EINVAL;
611 }
612 } else {
613 ht = tp->root;
614 htid = ht->handle;
615 }
616
617 if (ht->divisor < TC_U32_HASH(htid))
618 return -EINVAL;
619
620 if (handle) {
621 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
622 return -EINVAL;
623 handle = htid | TC_U32_NODE(handle);
624 } else
625 handle = gen_new_kid(ht, htid);
626
627 if (tb[TCA_U32_SEL] == NULL)
628 return -EINVAL;
629
630 s = nla_data(tb[TCA_U32_SEL]);
631
632 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
633 if (n == NULL)
634 return -ENOBUFS;
635
636#ifdef CONFIG_CLS_U32_PERF
637 n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
638 if (n->pf == NULL) {
639 kfree(n);
640 return -ENOBUFS;
641 }
642#endif
643
644 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
645 n->ht_up = ht;
646 n->handle = handle;
647 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
648
649#ifdef CONFIG_CLS_U32_MARK
650 if (tb[TCA_U32_MARK]) {
651 struct tc_u32_mark *mark;
652
653 mark = nla_data(tb[TCA_U32_MARK]);
654 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
655 n->mark.success = 0;
656 }
657#endif
658
659 err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
660 if (err == 0) {
661 struct tc_u_knode **ins;
662 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
663 if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
664 break;
665
666 n->next = *ins;
667 tcf_tree_lock(tp);
668 *ins = n;
669 tcf_tree_unlock(tp);
670
671 *arg = (unsigned long)n;
672 return 0;
673 }
674#ifdef CONFIG_CLS_U32_PERF
675 kfree(n->pf);
676#endif
677 kfree(n);
678 return err;
679}
680
681static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
682{
683 struct tc_u_common *tp_c = tp->data;
684 struct tc_u_hnode *ht;
685 struct tc_u_knode *n;
686 unsigned int h;
687
688 if (arg->stop)
689 return;
690
691 for (ht = tp_c->hlist; ht; ht = ht->next) {
692 if (ht->prio != tp->prio)
693 continue;
694 if (arg->count >= arg->skip) {
695 if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
696 arg->stop = 1;
697 return;
698 }
699 }
700 arg->count++;
701 for (h = 0; h <= ht->divisor; h++) {
702 for (n = ht->ht[h]; n; n = n->next) {
703 if (arg->count < arg->skip) {
704 arg->count++;
705 continue;
706 }
707 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
708 arg->stop = 1;
709 return;
710 }
711 arg->count++;
712 }
713 }
714 }
715}
716
717static int u32_dump(struct tcf_proto *tp, unsigned long fh,
718 struct sk_buff *skb, struct tcmsg *t)
719{
720 struct tc_u_knode *n = (struct tc_u_knode *)fh;
721 struct nlattr *nest;
722
723 if (n == NULL)
724 return skb->len;
725
726 t->tcm_handle = n->handle;
727
728 nest = nla_nest_start(skb, TCA_OPTIONS);
729 if (nest == NULL)
730 goto nla_put_failure;
731
732 if (TC_U32_KEY(n->handle) == 0) {
733 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
734 u32 divisor = ht->divisor + 1;
735
736 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
737 } else {
738 NLA_PUT(skb, TCA_U32_SEL,
739 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
740 &n->sel);
741 if (n->ht_up) {
742 u32 htid = n->handle & 0xFFFFF000;
743 NLA_PUT_U32(skb, TCA_U32_HASH, htid);
744 }
745 if (n->res.classid)
746 NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
747 if (n->ht_down)
748 NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
749
750#ifdef CONFIG_CLS_U32_MARK
751 if (n->mark.val || n->mark.mask)
752 NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
753#endif
754
755 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
756 goto nla_put_failure;
757
758#ifdef CONFIG_NET_CLS_IND
759 if (strlen(n->indev))
760 NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
761#endif
762#ifdef CONFIG_CLS_U32_PERF
763 NLA_PUT(skb, TCA_U32_PCNT,
764 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
765 n->pf);
766#endif
767 }
768
769 nla_nest_end(skb, nest);
770
771 if (TC_U32_KEY(n->handle))
772 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
773 goto nla_put_failure;
774 return skb->len;
775
776nla_put_failure:
777 nla_nest_cancel(skb, nest);
778 return -1;
779}
780
781static struct tcf_proto_ops cls_u32_ops __read_mostly = {
782 .kind = "u32",
783 .classify = u32_classify,
784 .init = u32_init,
785 .destroy = u32_destroy,
786 .get = u32_get,
787 .put = u32_put,
788 .change = u32_change,
789 .delete = u32_delete,
790 .walk = u32_walk,
791 .dump = u32_dump,
792 .owner = THIS_MODULE,
793};
794
795static int __init init_u32(void)
796{
797 pr_info("u32 classifier\n");
798#ifdef CONFIG_CLS_U32_PERF
799 pr_info(" Performance counters on\n");
800#endif
801#ifdef CONFIG_NET_CLS_IND
802 pr_info(" input device check on\n");
803#endif
804#ifdef CONFIG_NET_CLS_ACT
805 pr_info(" Actions configured\n");
806#endif
807 return register_tcf_proto_ops(&cls_u32_ops);
808}
809
810static void __exit exit_u32(void)
811{
812 unregister_tcf_proto_ops(&cls_u32_ops);
813}
814
815module_init(init_u32)
816module_exit(exit_u32)
817MODULE_LICENSE("GPL");