xref: /linux/net/sched/cls_u32.c (revision 14b42963f64b98ab61fa9723c03d71aa5ef4f862) 
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/module.h>
37 #include <linux/types.h>
38 #include <linux/kernel.h>
39 #include <linux/sched.h>
40 #include <linux/string.h>
41 #include <linux/mm.h>
42 #include <linux/socket.h>
43 #include <linux/sockios.h>
44 #include <linux/in.h>
45 #include <linux/errno.h>
46 #include <linux/interrupt.h>
47 #include <linux/if_ether.h>
48 #include <linux/inet.h>
49 #include <linux/netdevice.h>
50 #include <linux/etherdevice.h>
51 #include <linux/notifier.h>
52 #include <linux/rtnetlink.h>
53 #include <net/ip.h>
54 #include <net/route.h>
55 #include <linux/skbuff.h>
56 #include <net/sock.h>
57 #include <net/act_api.h>
58 #include <net/pkt_cls.h>
59 
60 struct tc_u_knode
61 {
62 	struct tc_u_knode	*next;
63 	u32			handle;
64 	struct tc_u_hnode	*ht_up;
65 	struct tcf_exts		exts;
66 #ifdef CONFIG_NET_CLS_IND
67 	char                     indev[IFNAMSIZ];
68 #endif
69 	u8			fshift;
70 	struct tcf_result	res;
71 	struct tc_u_hnode	*ht_down;
72 #ifdef CONFIG_CLS_U32_PERF
73 	struct tc_u32_pcnt	*pf;
74 #endif
75 #ifdef CONFIG_CLS_U32_MARK
76 	struct tc_u32_mark	mark;
77 #endif
78 	struct tc_u32_sel	sel;
79 };
80 
81 struct tc_u_hnode
82 {
83 	struct tc_u_hnode	*next;
84 	u32			handle;
85 	u32			prio;
86 	struct tc_u_common	*tp_c;
87 	int			refcnt;
88 	unsigned		divisor;
89 	struct tc_u_knode	*ht[1];
90 };
91 
92 struct tc_u_common
93 {
94 	struct tc_u_common	*next;
95 	struct tc_u_hnode	*hlist;
96 	struct Qdisc		*q;
97 	int			refcnt;
98 	u32			hgenerator;
99 };
100 
101 static struct tcf_ext_map u32_ext_map = {
102 	.action = TCA_U32_ACT,
103 	.police = TCA_U32_POLICE
104 };
105 
106 static struct tc_u_common *u32_list;
107 
108 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
109 {
110 	unsigned h = (key & sel->hmask)>>fshift;
111 
112 	return h;
113 }
114 
115 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
116 {
117 	struct {
118 		struct tc_u_knode *knode;
119 		u8		  *ptr;
120 	} stack[TC_U32_MAXDEPTH];
121 
122 	struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
123 	u8 *ptr = skb->nh.raw;
124 	struct tc_u_knode *n;
125 	int sdepth = 0;
126 	int off2 = 0;
127 	int sel = 0;
128 #ifdef CONFIG_CLS_U32_PERF
129 	int j;
130 #endif
131 	int i, r;
132 
133 next_ht:
134 	n = ht->ht[sel];
135 
136 next_knode:
137 	if (n) {
138 		struct tc_u32_key *key = n->sel.keys;
139 
140 #ifdef CONFIG_CLS_U32_PERF
141 		n->pf->rcnt +=1;
142 		j = 0;
143 #endif
144 
145 #ifdef CONFIG_CLS_U32_MARK
146 		if ((skb->nfmark & n->mark.mask) != n->mark.val) {
147 			n = n->next;
148 			goto next_knode;
149 		} else {
150 			n->mark.success++;
151 		}
152 #endif
153 
154 		for (i = n->sel.nkeys; i>0; i--, key++) {
155 
156 			if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
157 				n = n->next;
158 				goto next_knode;
159 			}
160 #ifdef CONFIG_CLS_U32_PERF
161 			n->pf->kcnts[j] +=1;
162 			j++;
163 #endif
164 		}
165 		if (n->ht_down == NULL) {
166 check_terminal:
167 			if (n->sel.flags&TC_U32_TERMINAL) {
168 
169 				*res = n->res;
170 #ifdef CONFIG_NET_CLS_IND
171 				if (!tcf_match_indev(skb, n->indev)) {
172 					n = n->next;
173 					goto next_knode;
174 				}
175 #endif
176 #ifdef CONFIG_CLS_U32_PERF
177 				n->pf->rhit +=1;
178 #endif
179 				r = tcf_exts_exec(skb, &n->exts, res);
180 				if (r < 0) {
181 					n = n->next;
182 					goto next_knode;
183 				}
184 
185 				return r;
186 			}
187 			n = n->next;
188 			goto next_knode;
189 		}
190 
191 		/* PUSH */
192 		if (sdepth >= TC_U32_MAXDEPTH)
193 			goto deadloop;
194 		stack[sdepth].knode = n;
195 		stack[sdepth].ptr = ptr;
196 		sdepth++;
197 
198 		ht = n->ht_down;
199 		sel = 0;
200 		if (ht->divisor)
201 			sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
202 
203 		if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
204 			goto next_ht;
205 
206 		if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
207 			off2 = n->sel.off + 3;
208 			if (n->sel.flags&TC_U32_VAROFFSET)
209 				off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
210 			off2 &= ~3;
211 		}
212 		if (n->sel.flags&TC_U32_EAT) {
213 			ptr += off2;
214 			off2 = 0;
215 		}
216 
217 		if (ptr < skb->tail)
218 			goto next_ht;
219 	}
220 
221 	/* POP */
222 	if (sdepth--) {
223 		n = stack[sdepth].knode;
224 		ht = n->ht_up;
225 		ptr = stack[sdepth].ptr;
226 		goto check_terminal;
227 	}
228 	return -1;
229 
230 deadloop:
231 	if (net_ratelimit())
232 		printk("cls_u32: dead loop\n");
233 	return -1;
234 }
235 
236 static __inline__ struct tc_u_hnode *
237 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
238 {
239 	struct tc_u_hnode *ht;
240 
241 	for (ht = tp_c->hlist; ht; ht = ht->next)
242 		if (ht->handle == handle)
243 			break;
244 
245 	return ht;
246 }
247 
248 static __inline__ struct tc_u_knode *
249 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
250 {
251 	unsigned sel;
252 	struct tc_u_knode *n = NULL;
253 
254 	sel = TC_U32_HASH(handle);
255 	if (sel > ht->divisor)
256 		goto out;
257 
258 	for (n = ht->ht[sel]; n; n = n->next)
259 		if (n->handle == handle)
260 			break;
261 out:
262 	return n;
263 }
264 
265 
266 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
267 {
268 	struct tc_u_hnode *ht;
269 	struct tc_u_common *tp_c = tp->data;
270 
271 	if (TC_U32_HTID(handle) == TC_U32_ROOT)
272 		ht = tp->root;
273 	else
274 		ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
275 
276 	if (!ht)
277 		return 0;
278 
279 	if (TC_U32_KEY(handle) == 0)
280 		return (unsigned long)ht;
281 
282 	return (unsigned long)u32_lookup_key(ht, handle);
283 }
284 
285 static void u32_put(struct tcf_proto *tp, unsigned long f)
286 {
287 }
288 
289 static u32 gen_new_htid(struct tc_u_common *tp_c)
290 {
291 	int i = 0x800;
292 
293 	do {
294 		if (++tp_c->hgenerator == 0x7FF)
295 			tp_c->hgenerator = 1;
296 	} while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
297 
298 	return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
299 }
300 
301 static int u32_init(struct tcf_proto *tp)
302 {
303 	struct tc_u_hnode *root_ht;
304 	struct tc_u_common *tp_c;
305 
306 	for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
307 		if (tp_c->q == tp->q)
308 			break;
309 
310 	root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
311 	if (root_ht == NULL)
312 		return -ENOBUFS;
313 
314 	memset(root_ht, 0, sizeof(*root_ht));
315 	root_ht->divisor = 0;
316 	root_ht->refcnt++;
317 	root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
318 	root_ht->prio = tp->prio;
319 
320 	if (tp_c == NULL) {
321 		tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
322 		if (tp_c == NULL) {
323 			kfree(root_ht);
324 			return -ENOBUFS;
325 		}
326 		memset(tp_c, 0, sizeof(*tp_c));
327 		tp_c->q = tp->q;
328 		tp_c->next = u32_list;
329 		u32_list = 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 
342 static 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 
355 static 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 	BUG_TRAP(0);
373 	return 0;
374 }
375 
376 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
377 {
378 	struct tc_u_knode *n;
379 	unsigned 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 
390 static 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 	BUG_TRAP(!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 	BUG_TRAP(0);
408 	return -ENOENT;
409 }
410 
411 static void u32_destroy(struct tcf_proto *tp)
412 {
413 	struct tc_u_common *tp_c = tp->data;
414 	struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
415 
416 	BUG_TRAP(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 		struct tc_u_common **tp_cp;
424 
425 		for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
426 			if (*tp_cp == tp_c) {
427 				*tp_cp = tp_c->next;
428 				break;
429 			}
430 		}
431 
432 		for (ht=tp_c->hlist; ht; ht = ht->next)
433 			u32_clear_hnode(tp, ht);
434 
435 		while ((ht = tp_c->hlist) != NULL) {
436 			tp_c->hlist = ht->next;
437 
438 			BUG_TRAP(ht->refcnt == 0);
439 
440 			kfree(ht);
441 		};
442 
443 		kfree(tp_c);
444 	}
445 
446 	tp->data = NULL;
447 }
448 
449 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
450 {
451 	struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
452 
453 	if (ht == NULL)
454 		return 0;
455 
456 	if (TC_U32_KEY(ht->handle))
457 		return u32_delete_key(tp, (struct tc_u_knode*)ht);
458 
459 	if (tp->root == ht)
460 		return -EINVAL;
461 
462 	if (--ht->refcnt == 0)
463 		u32_destroy_hnode(tp, ht);
464 
465 	return 0;
466 }
467 
468 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
469 {
470 	struct tc_u_knode *n;
471 	unsigned 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 
481 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
482 			 struct tc_u_hnode *ht,
483 			 struct tc_u_knode *n, struct rtattr **tb,
484 			 struct rtattr *est)
485 {
486 	int err;
487 	struct tcf_exts e;
488 
489 	err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
490 	if (err < 0)
491 		return err;
492 
493 	err = -EINVAL;
494 	if (tb[TCA_U32_LINK-1]) {
495 		u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
496 		struct tc_u_hnode *ht_down = NULL;
497 
498 		if (TC_U32_KEY(handle))
499 			goto errout;
500 
501 		if (handle) {
502 			ht_down = u32_lookup_ht(ht->tp_c, handle);
503 
504 			if (ht_down == NULL)
505 				goto errout;
506 			ht_down->refcnt++;
507 		}
508 
509 		tcf_tree_lock(tp);
510 		ht_down = xchg(&n->ht_down, ht_down);
511 		tcf_tree_unlock(tp);
512 
513 		if (ht_down)
514 			ht_down->refcnt--;
515 	}
516 	if (tb[TCA_U32_CLASSID-1]) {
517 		n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
518 		tcf_bind_filter(tp, &n->res, base);
519 	}
520 
521 #ifdef CONFIG_NET_CLS_IND
522 	if (tb[TCA_U32_INDEV-1]) {
523 		int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
524 		if (err < 0)
525 			goto errout;
526 	}
527 #endif
528 	tcf_exts_change(tp, &n->exts, &e);
529 
530 	return 0;
531 errout:
532 	tcf_exts_destroy(tp, &e);
533 	return err;
534 }
535 
536 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
537 		      struct rtattr **tca,
538 		      unsigned long *arg)
539 {
540 	struct tc_u_common *tp_c = tp->data;
541 	struct tc_u_hnode *ht;
542 	struct tc_u_knode *n;
543 	struct tc_u32_sel *s;
544 	struct rtattr *opt = tca[TCA_OPTIONS-1];
545 	struct rtattr *tb[TCA_U32_MAX];
546 	u32 htid;
547 	int err;
548 
549 	if (opt == NULL)
550 		return handle ? -EINVAL : 0;
551 
552 	if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
553 		return -EINVAL;
554 
555 	if ((n = (struct tc_u_knode*)*arg) != NULL) {
556 		if (TC_U32_KEY(n->handle) == 0)
557 			return -EINVAL;
558 
559 		return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
560 	}
561 
562 	if (tb[TCA_U32_DIVISOR-1]) {
563 		unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
564 
565 		if (--divisor > 0x100)
566 			return -EINVAL;
567 		if (TC_U32_KEY(handle))
568 			return -EINVAL;
569 		if (handle == 0) {
570 			handle = gen_new_htid(tp->data);
571 			if (handle == 0)
572 				return -ENOMEM;
573 		}
574 		ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
575 		if (ht == NULL)
576 			return -ENOBUFS;
577 		memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
578 		ht->tp_c = tp_c;
579 		ht->refcnt = 0;
580 		ht->divisor = divisor;
581 		ht->handle = handle;
582 		ht->prio = tp->prio;
583 		ht->next = tp_c->hlist;
584 		tp_c->hlist = ht;
585 		*arg = (unsigned long)ht;
586 		return 0;
587 	}
588 
589 	if (tb[TCA_U32_HASH-1]) {
590 		htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
591 		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
592 			ht = tp->root;
593 			htid = ht->handle;
594 		} else {
595 			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
596 			if (ht == NULL)
597 				return -EINVAL;
598 		}
599 	} else {
600 		ht = tp->root;
601 		htid = ht->handle;
602 	}
603 
604 	if (ht->divisor < TC_U32_HASH(htid))
605 		return -EINVAL;
606 
607 	if (handle) {
608 		if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
609 			return -EINVAL;
610 		handle = htid | TC_U32_NODE(handle);
611 	} else
612 		handle = gen_new_kid(ht, htid);
613 
614 	if (tb[TCA_U32_SEL-1] == 0 ||
615 	    RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
616 		return -EINVAL;
617 
618 	s = RTA_DATA(tb[TCA_U32_SEL-1]);
619 
620 	n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
621 	if (n == NULL)
622 		return -ENOBUFS;
623 
624 	memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
625 #ifdef CONFIG_CLS_U32_PERF
626 	n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
627 	if (n->pf == NULL) {
628 		kfree(n);
629 		return -ENOBUFS;
630 	}
631 	memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64));
632 #endif
633 
634 	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
635 	n->ht_up = ht;
636 	n->handle = handle;
637 {
638 	u8 i = 0;
639 	u32 mask = s->hmask;
640 	if (mask) {
641 		while (!(mask & 1)) {
642 			i++;
643 			mask>>=1;
644 		}
645 	}
646 	n->fshift = i;
647 }
648 
649 #ifdef CONFIG_CLS_U32_MARK
650 	if (tb[TCA_U32_MARK-1]) {
651 		struct tc_u32_mark *mark;
652 
653 		if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
654 #ifdef CONFIG_CLS_U32_PERF
655 			kfree(n->pf);
656 #endif
657 			kfree(n);
658 			return -EINVAL;
659 		}
660 		mark = RTA_DATA(tb[TCA_U32_MARK-1]);
661 		memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
662 		n->mark.success = 0;
663 	}
664 #endif
665 
666 	err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
667 	if (err == 0) {
668 		struct tc_u_knode **ins;
669 		for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
670 			if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
671 				break;
672 
673 		n->next = *ins;
674 		wmb();
675 		*ins = n;
676 
677 		*arg = (unsigned long)n;
678 		return 0;
679 	}
680 #ifdef CONFIG_CLS_U32_PERF
681 	kfree(n->pf);
682 #endif
683 	kfree(n);
684 	return err;
685 }
686 
687 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
688 {
689 	struct tc_u_common *tp_c = tp->data;
690 	struct tc_u_hnode *ht;
691 	struct tc_u_knode *n;
692 	unsigned h;
693 
694 	if (arg->stop)
695 		return;
696 
697 	for (ht = tp_c->hlist; ht; ht = ht->next) {
698 		if (ht->prio != tp->prio)
699 			continue;
700 		if (arg->count >= arg->skip) {
701 			if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
702 				arg->stop = 1;
703 				return;
704 			}
705 		}
706 		arg->count++;
707 		for (h = 0; h <= ht->divisor; h++) {
708 			for (n = ht->ht[h]; n; n = n->next) {
709 				if (arg->count < arg->skip) {
710 					arg->count++;
711 					continue;
712 				}
713 				if (arg->fn(tp, (unsigned long)n, arg) < 0) {
714 					arg->stop = 1;
715 					return;
716 				}
717 				arg->count++;
718 			}
719 		}
720 	}
721 }
722 
723 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
724 		     struct sk_buff *skb, struct tcmsg *t)
725 {
726 	struct tc_u_knode *n = (struct tc_u_knode*)fh;
727 	unsigned char	 *b = skb->tail;
728 	struct rtattr *rta;
729 
730 	if (n == NULL)
731 		return skb->len;
732 
733 	t->tcm_handle = n->handle;
734 
735 	rta = (struct rtattr*)b;
736 	RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
737 
738 	if (TC_U32_KEY(n->handle) == 0) {
739 		struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
740 		u32 divisor = ht->divisor+1;
741 		RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
742 	} else {
743 		RTA_PUT(skb, TCA_U32_SEL,
744 			sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
745 			&n->sel);
746 		if (n->ht_up) {
747 			u32 htid = n->handle & 0xFFFFF000;
748 			RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
749 		}
750 		if (n->res.classid)
751 			RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
752 		if (n->ht_down)
753 			RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
754 
755 #ifdef CONFIG_CLS_U32_MARK
756 		if (n->mark.val || n->mark.mask)
757 			RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
758 #endif
759 
760 		if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
761 			goto rtattr_failure;
762 
763 #ifdef CONFIG_NET_CLS_IND
764 		if(strlen(n->indev))
765 			RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
766 #endif
767 #ifdef CONFIG_CLS_U32_PERF
768 		RTA_PUT(skb, TCA_U32_PCNT,
769 		sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
770 			n->pf);
771 #endif
772 	}
773 
774 	rta->rta_len = skb->tail - b;
775 	if (TC_U32_KEY(n->handle))
776 		if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
777 			goto rtattr_failure;
778 	return skb->len;
779 
780 rtattr_failure:
781 	skb_trim(skb, b - skb->data);
782 	return -1;
783 }
784 
785 static struct tcf_proto_ops cls_u32_ops = {
786 	.next		=	NULL,
787 	.kind		=	"u32",
788 	.classify	=	u32_classify,
789 	.init		=	u32_init,
790 	.destroy	=	u32_destroy,
791 	.get		=	u32_get,
792 	.put		=	u32_put,
793 	.change		=	u32_change,
794 	.delete		=	u32_delete,
795 	.walk		=	u32_walk,
796 	.dump		=	u32_dump,
797 	.owner		=	THIS_MODULE,
798 };
799 
800 static int __init init_u32(void)
801 {
802 	printk("u32 classifier\n");
803 #ifdef CONFIG_CLS_U32_PERF
804 	printk("    Perfomance counters on\n");
805 #endif
806 #ifdef CONFIG_NET_CLS_POLICE
807 	printk("    OLD policer on \n");
808 #endif
809 #ifdef CONFIG_NET_CLS_IND
810 	printk("    input device check on \n");
811 #endif
812 #ifdef CONFIG_NET_CLS_ACT
813 	printk("    Actions configured \n");
814 #endif
815 	return register_tcf_proto_ops(&cls_u32_ops);
816 }
817 
818 static void __exit exit_u32(void)
819 {
820 	unregister_tcf_proto_ops(&cls_u32_ops);
821 }
822 
823 module_init(init_u32)
824 module_exit(exit_u32)
825 MODULE_LICENSE("GPL");
826