xref: /linux/net/sched/cls_u32.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15) 
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 <asm/uaccess.h>
34 #include <asm/system.h>
35 #include <linux/bitops.h>
36 #include <linux/config.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/kernel.h>
40 #include <linux/sched.h>
41 #include <linux/string.h>
42 #include <linux/mm.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/in.h>
46 #include <linux/errno.h>
47 #include <linux/interrupt.h>
48 #include <linux/if_ether.h>
49 #include <linux/inet.h>
50 #include <linux/netdevice.h>
51 #include <linux/etherdevice.h>
52 #include <linux/notifier.h>
53 #include <linux/rtnetlink.h>
54 #include <net/ip.h>
55 #include <net/route.h>
56 #include <linux/skbuff.h>
57 #include <net/sock.h>
58 #include <net/act_api.h>
59 #include <net/pkt_cls.h>
60 
61 struct tc_u_knode
62 {
63 	struct tc_u_knode	*next;
64 	u32			handle;
65 	struct tc_u_hnode	*ht_up;
66 	struct tcf_exts		exts;
67 #ifdef CONFIG_NET_CLS_IND
68 	char                     indev[IFNAMSIZ];
69 #endif
70 	u8			fshift;
71 	struct tcf_result	res;
72 	struct tc_u_hnode	*ht_down;
73 #ifdef CONFIG_CLS_U32_PERF
74 	struct tc_u32_pcnt	*pf;
75 #endif
76 #ifdef CONFIG_CLS_U32_MARK
77 	struct tc_u32_mark	mark;
78 #endif
79 	struct tc_u32_sel	sel;
80 };
81 
82 struct tc_u_hnode
83 {
84 	struct tc_u_hnode	*next;
85 	u32			handle;
86 	u32			prio;
87 	struct tc_u_common	*tp_c;
88 	int			refcnt;
89 	unsigned		divisor;
90 	struct tc_u_knode	*ht[1];
91 };
92 
93 struct tc_u_common
94 {
95 	struct tc_u_common	*next;
96 	struct tc_u_hnode	*hlist;
97 	struct Qdisc		*q;
98 	int			refcnt;
99 	u32			hgenerator;
100 };
101 
102 static struct tcf_ext_map u32_ext_map = {
103 	.action = TCA_U32_ACT,
104 	.police = TCA_U32_POLICE
105 };
106 
107 static struct tc_u_common *u32_list;
108 
109 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
110 {
111 	unsigned h = (key & sel->hmask)>>fshift;
112 
113 	return h;
114 }
115 
116 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
117 {
118 	struct {
119 		struct tc_u_knode *knode;
120 		u8		  *ptr;
121 	} stack[TC_U32_MAXDEPTH];
122 
123 	struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
124 	u8 *ptr = skb->nh.raw;
125 	struct tc_u_knode *n;
126 	int sdepth = 0;
127 	int off2 = 0;
128 	int sel = 0;
129 #ifdef CONFIG_CLS_U32_PERF
130 	int j;
131 #endif
132 	int i, r;
133 
134 next_ht:
135 	n = ht->ht[sel];
136 
137 next_knode:
138 	if (n) {
139 		struct tc_u32_key *key = n->sel.keys;
140 
141 #ifdef CONFIG_CLS_U32_PERF
142 		n->pf->rcnt +=1;
143 		j = 0;
144 #endif
145 
146 #ifdef CONFIG_CLS_U32_MARK
147 		if ((skb->nfmark & n->mark.mask) != n->mark.val) {
148 			n = n->next;
149 			goto next_knode;
150 		} else {
151 			n->mark.success++;
152 		}
153 #endif
154 
155 		for (i = n->sel.nkeys; i>0; i--, key++) {
156 
157 			if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
158 				n = n->next;
159 				goto next_knode;
160 			}
161 #ifdef CONFIG_CLS_U32_PERF
162 			n->pf->kcnts[j] +=1;
163 			j++;
164 #endif
165 		}
166 		if (n->ht_down == NULL) {
167 check_terminal:
168 			if (n->sel.flags&TC_U32_TERMINAL) {
169 
170 				*res = n->res;
171 #ifdef CONFIG_NET_CLS_IND
172 				if (!tcf_match_indev(skb, n->indev)) {
173 					n = n->next;
174 					goto next_knode;
175 				}
176 #endif
177 #ifdef CONFIG_CLS_U32_PERF
178 				n->pf->rhit +=1;
179 #endif
180 				r = tcf_exts_exec(skb, &n->exts, res);
181 				if (r < 0) {
182 					n = n->next;
183 					goto next_knode;
184 				}
185 
186 				return r;
187 			}
188 			n = n->next;
189 			goto next_knode;
190 		}
191 
192 		/* PUSH */
193 		if (sdepth >= TC_U32_MAXDEPTH)
194 			goto deadloop;
195 		stack[sdepth].knode = n;
196 		stack[sdepth].ptr = ptr;
197 		sdepth++;
198 
199 		ht = n->ht_down;
200 		sel = 0;
201 		if (ht->divisor)
202 			sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
203 
204 		if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
205 			goto next_ht;
206 
207 		if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
208 			off2 = n->sel.off + 3;
209 			if (n->sel.flags&TC_U32_VAROFFSET)
210 				off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
211 			off2 &= ~3;
212 		}
213 		if (n->sel.flags&TC_U32_EAT) {
214 			ptr += off2;
215 			off2 = 0;
216 		}
217 
218 		if (ptr < skb->tail)
219 			goto next_ht;
220 	}
221 
222 	/* POP */
223 	if (sdepth--) {
224 		n = stack[sdepth].knode;
225 		ht = n->ht_up;
226 		ptr = stack[sdepth].ptr;
227 		goto check_terminal;
228 	}
229 	return -1;
230 
231 deadloop:
232 	if (net_ratelimit())
233 		printk("cls_u32: dead loop\n");
234 	return -1;
235 }
236 
237 static __inline__ struct tc_u_hnode *
238 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
239 {
240 	struct tc_u_hnode *ht;
241 
242 	for (ht = tp_c->hlist; ht; ht = ht->next)
243 		if (ht->handle == handle)
244 			break;
245 
246 	return ht;
247 }
248 
249 static __inline__ struct tc_u_knode *
250 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
251 {
252 	unsigned sel;
253 	struct tc_u_knode *n = NULL;
254 
255 	sel = TC_U32_HASH(handle);
256 	if (sel > ht->divisor)
257 		goto out;
258 
259 	for (n = ht->ht[sel]; n; n = n->next)
260 		if (n->handle == handle)
261 			break;
262 out:
263 	return n;
264 }
265 
266 
267 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
268 {
269 	struct tc_u_hnode *ht;
270 	struct tc_u_common *tp_c = tp->data;
271 
272 	if (TC_U32_HTID(handle) == TC_U32_ROOT)
273 		ht = tp->root;
274 	else
275 		ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
276 
277 	if (!ht)
278 		return 0;
279 
280 	if (TC_U32_KEY(handle) == 0)
281 		return (unsigned long)ht;
282 
283 	return (unsigned long)u32_lookup_key(ht, handle);
284 }
285 
286 static void u32_put(struct tcf_proto *tp, unsigned long f)
287 {
288 }
289 
290 static u32 gen_new_htid(struct tc_u_common *tp_c)
291 {
292 	int i = 0x800;
293 
294 	do {
295 		if (++tp_c->hgenerator == 0x7FF)
296 			tp_c->hgenerator = 1;
297 	} while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
298 
299 	return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
300 }
301 
302 static int u32_init(struct tcf_proto *tp)
303 {
304 	struct tc_u_hnode *root_ht;
305 	struct tc_u_common *tp_c;
306 
307 	for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
308 		if (tp_c->q == tp->q)
309 			break;
310 
311 	root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
312 	if (root_ht == NULL)
313 		return -ENOBUFS;
314 
315 	memset(root_ht, 0, sizeof(*root_ht));
316 	root_ht->divisor = 0;
317 	root_ht->refcnt++;
318 	root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
319 	root_ht->prio = tp->prio;
320 
321 	if (tp_c == NULL) {
322 		tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
323 		if (tp_c == NULL) {
324 			kfree(root_ht);
325 			return -ENOBUFS;
326 		}
327 		memset(tp_c, 0, sizeof(*tp_c));
328 		tp_c->q = tp->q;
329 		tp_c->next = u32_list;
330 		u32_list = 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 
343 static 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 
356 static 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 	BUG_TRAP(0);
374 	return 0;
375 }
376 
377 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
378 {
379 	struct tc_u_knode *n;
380 	unsigned 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 
391 static 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 	BUG_TRAP(!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 	BUG_TRAP(0);
409 	return -ENOENT;
410 }
411 
412 static void u32_destroy(struct tcf_proto *tp)
413 {
414 	struct tc_u_common *tp_c = tp->data;
415 	struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
416 
417 	BUG_TRAP(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 		struct tc_u_common **tp_cp;
425 
426 		for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
427 			if (*tp_cp == tp_c) {
428 				*tp_cp = tp_c->next;
429 				break;
430 			}
431 		}
432 
433 		for (ht=tp_c->hlist; ht; ht = ht->next)
434 			u32_clear_hnode(tp, ht);
435 
436 		while ((ht = tp_c->hlist) != NULL) {
437 			tp_c->hlist = ht->next;
438 
439 			BUG_TRAP(ht->refcnt == 0);
440 
441 			kfree(ht);
442 		};
443 
444 		kfree(tp_c);
445 	}
446 
447 	tp->data = NULL;
448 }
449 
450 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
451 {
452 	struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
453 
454 	if (ht == NULL)
455 		return 0;
456 
457 	if (TC_U32_KEY(ht->handle))
458 		return u32_delete_key(tp, (struct tc_u_knode*)ht);
459 
460 	if (tp->root == ht)
461 		return -EINVAL;
462 
463 	if (--ht->refcnt == 0)
464 		u32_destroy_hnode(tp, ht);
465 
466 	return 0;
467 }
468 
469 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
470 {
471 	struct tc_u_knode *n;
472 	unsigned 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 
482 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
483 			 struct tc_u_hnode *ht,
484 			 struct tc_u_knode *n, struct rtattr **tb,
485 			 struct rtattr *est)
486 {
487 	int err;
488 	struct tcf_exts e;
489 
490 	err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
491 	if (err < 0)
492 		return err;
493 
494 	err = -EINVAL;
495 	if (tb[TCA_U32_LINK-1]) {
496 		u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
497 		struct tc_u_hnode *ht_down = NULL;
498 
499 		if (TC_U32_KEY(handle))
500 			goto errout;
501 
502 		if (handle) {
503 			ht_down = u32_lookup_ht(ht->tp_c, handle);
504 
505 			if (ht_down == NULL)
506 				goto errout;
507 			ht_down->refcnt++;
508 		}
509 
510 		tcf_tree_lock(tp);
511 		ht_down = xchg(&n->ht_down, ht_down);
512 		tcf_tree_unlock(tp);
513 
514 		if (ht_down)
515 			ht_down->refcnt--;
516 	}
517 	if (tb[TCA_U32_CLASSID-1]) {
518 		n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
519 		tcf_bind_filter(tp, &n->res, base);
520 	}
521 
522 #ifdef CONFIG_NET_CLS_IND
523 	if (tb[TCA_U32_INDEV-1]) {
524 		int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
525 		if (err < 0)
526 			goto errout;
527 	}
528 #endif
529 	tcf_exts_change(tp, &n->exts, &e);
530 
531 	return 0;
532 errout:
533 	tcf_exts_destroy(tp, &e);
534 	return err;
535 }
536 
537 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
538 		      struct rtattr **tca,
539 		      unsigned long *arg)
540 {
541 	struct tc_u_common *tp_c = tp->data;
542 	struct tc_u_hnode *ht;
543 	struct tc_u_knode *n;
544 	struct tc_u32_sel *s;
545 	struct rtattr *opt = tca[TCA_OPTIONS-1];
546 	struct rtattr *tb[TCA_U32_MAX];
547 	u32 htid;
548 	int err;
549 
550 	if (opt == NULL)
551 		return handle ? -EINVAL : 0;
552 
553 	if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
554 		return -EINVAL;
555 
556 	if ((n = (struct tc_u_knode*)*arg) != NULL) {
557 		if (TC_U32_KEY(n->handle) == 0)
558 			return -EINVAL;
559 
560 		return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
561 	}
562 
563 	if (tb[TCA_U32_DIVISOR-1]) {
564 		unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
565 
566 		if (--divisor > 0x100)
567 			return -EINVAL;
568 		if (TC_U32_KEY(handle))
569 			return -EINVAL;
570 		if (handle == 0) {
571 			handle = gen_new_htid(tp->data);
572 			if (handle == 0)
573 				return -ENOMEM;
574 		}
575 		ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
576 		if (ht == NULL)
577 			return -ENOBUFS;
578 		memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
579 		ht->tp_c = tp_c;
580 		ht->refcnt = 0;
581 		ht->divisor = divisor;
582 		ht->handle = handle;
583 		ht->prio = tp->prio;
584 		ht->next = tp_c->hlist;
585 		tp_c->hlist = ht;
586 		*arg = (unsigned long)ht;
587 		return 0;
588 	}
589 
590 	if (tb[TCA_U32_HASH-1]) {
591 		htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
592 		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
593 			ht = tp->root;
594 			htid = ht->handle;
595 		} else {
596 			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
597 			if (ht == NULL)
598 				return -EINVAL;
599 		}
600 	} else {
601 		ht = tp->root;
602 		htid = ht->handle;
603 	}
604 
605 	if (ht->divisor < TC_U32_HASH(htid))
606 		return -EINVAL;
607 
608 	if (handle) {
609 		if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
610 			return -EINVAL;
611 		handle = htid | TC_U32_NODE(handle);
612 	} else
613 		handle = gen_new_kid(ht, htid);
614 
615 	if (tb[TCA_U32_SEL-1] == 0 ||
616 	    RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
617 		return -EINVAL;
618 
619 	s = RTA_DATA(tb[TCA_U32_SEL-1]);
620 
621 	n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
622 	if (n == NULL)
623 		return -ENOBUFS;
624 
625 	memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
626 #ifdef CONFIG_CLS_U32_PERF
627 	n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
628 	if (n->pf == NULL) {
629 		kfree(n);
630 		return -ENOBUFS;
631 	}
632 	memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64));
633 #endif
634 
635 	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
636 	n->ht_up = ht;
637 	n->handle = handle;
638 {
639 	u8 i = 0;
640 	u32 mask = s->hmask;
641 	if (mask) {
642 		while (!(mask & 1)) {
643 			i++;
644 			mask>>=1;
645 		}
646 	}
647 	n->fshift = i;
648 }
649 
650 #ifdef CONFIG_CLS_U32_MARK
651 	if (tb[TCA_U32_MARK-1]) {
652 		struct tc_u32_mark *mark;
653 
654 		if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
655 #ifdef CONFIG_CLS_U32_PERF
656 			kfree(n->pf);
657 #endif
658 			kfree(n);
659 			return -EINVAL;
660 		}
661 		mark = RTA_DATA(tb[TCA_U32_MARK-1]);
662 		memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
663 		n->mark.success = 0;
664 	}
665 #endif
666 
667 	err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
668 	if (err == 0) {
669 		struct tc_u_knode **ins;
670 		for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
671 			if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
672 				break;
673 
674 		n->next = *ins;
675 		wmb();
676 		*ins = n;
677 
678 		*arg = (unsigned long)n;
679 		return 0;
680 	}
681 #ifdef CONFIG_CLS_U32_PERF
682 	kfree(n->pf);
683 #endif
684 	kfree(n);
685 	return err;
686 }
687 
688 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
689 {
690 	struct tc_u_common *tp_c = tp->data;
691 	struct tc_u_hnode *ht;
692 	struct tc_u_knode *n;
693 	unsigned h;
694 
695 	if (arg->stop)
696 		return;
697 
698 	for (ht = tp_c->hlist; ht; ht = ht->next) {
699 		if (ht->prio != tp->prio)
700 			continue;
701 		if (arg->count >= arg->skip) {
702 			if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
703 				arg->stop = 1;
704 				return;
705 			}
706 		}
707 		arg->count++;
708 		for (h = 0; h <= ht->divisor; h++) {
709 			for (n = ht->ht[h]; n; n = n->next) {
710 				if (arg->count < arg->skip) {
711 					arg->count++;
712 					continue;
713 				}
714 				if (arg->fn(tp, (unsigned long)n, arg) < 0) {
715 					arg->stop = 1;
716 					return;
717 				}
718 				arg->count++;
719 			}
720 		}
721 	}
722 }
723 
724 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
725 		     struct sk_buff *skb, struct tcmsg *t)
726 {
727 	struct tc_u_knode *n = (struct tc_u_knode*)fh;
728 	unsigned char	 *b = skb->tail;
729 	struct rtattr *rta;
730 
731 	if (n == NULL)
732 		return skb->len;
733 
734 	t->tcm_handle = n->handle;
735 
736 	rta = (struct rtattr*)b;
737 	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
738 
739 	if (TC_U32_KEY(n->handle) == 0) {
740 		struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
741 		u32 divisor = ht->divisor+1;
742 		RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
743 	} else {
744 		RTA_PUT(skb, TCA_U32_SEL,
745 			sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
746 			&n->sel);
747 		if (n->ht_up) {
748 			u32 htid = n->handle & 0xFFFFF000;
749 			RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
750 		}
751 		if (n->res.classid)
752 			RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
753 		if (n->ht_down)
754 			RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
755 
756 #ifdef CONFIG_CLS_U32_MARK
757 		if (n->mark.val || n->mark.mask)
758 			RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
759 #endif
760 
761 		if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
762 			goto rtattr_failure;
763 
764 #ifdef CONFIG_NET_CLS_IND
765 		if(strlen(n->indev))
766 			RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
767 #endif
768 #ifdef CONFIG_CLS_U32_PERF
769 		RTA_PUT(skb, TCA_U32_PCNT,
770 		sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
771 			n->pf);
772 #endif
773 	}
774 
775 	rta->rta_len = skb->tail - b;
776 	if (TC_U32_KEY(n->handle))
777 		if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
778 			goto rtattr_failure;
779 	return skb->len;
780 
781 rtattr_failure:
782 	skb_trim(skb, b - skb->data);
783 	return -1;
784 }
785 
786 static struct tcf_proto_ops cls_u32_ops = {
787 	.next		=	NULL,
788 	.kind		=	"u32",
789 	.classify	=	u32_classify,
790 	.init		=	u32_init,
791 	.destroy	=	u32_destroy,
792 	.get		=	u32_get,
793 	.put		=	u32_put,
794 	.change		=	u32_change,
795 	.delete		=	u32_delete,
796 	.walk		=	u32_walk,
797 	.dump		=	u32_dump,
798 	.owner		=	THIS_MODULE,
799 };
800 
801 static int __init init_u32(void)
802 {
803 	printk("u32 classifier\n");
804 #ifdef CONFIG_CLS_U32_PERF
805 	printk("    Perfomance counters on\n");
806 #endif
807 #ifdef CONFIG_NET_CLS_POLICE
808 	printk("    OLD policer on \n");
809 #endif
810 #ifdef CONFIG_NET_CLS_IND
811 	printk("    input device check on \n");
812 #endif
813 #ifdef CONFIG_NET_CLS_ACT
814 	printk("    Actions configured \n");
815 #endif
816 	return register_tcf_proto_ops(&cls_u32_ops);
817 }
818 
819 static void __exit exit_u32(void)
820 {
821 	unregister_tcf_proto_ops(&cls_u32_ops);
822 }
823 
824 module_init(init_u32)
825 module_exit(exit_u32)
826 MODULE_LICENSE("GPL");
827