xref: /openbmc/linux/net/sched/cls_u32.c (revision ddc141e5)
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/percpu.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/skbuff.h>
42 #include <linux/bitmap.h>
43 #include <linux/netdevice.h>
44 #include <linux/hash.h>
45 #include <net/netlink.h>
46 #include <net/act_api.h>
47 #include <net/pkt_cls.h>
48 #include <linux/idr.h>
49 
50 struct tc_u_knode {
51 	struct tc_u_knode __rcu	*next;
52 	u32			handle;
53 	struct tc_u_hnode __rcu	*ht_up;
54 	struct tcf_exts		exts;
55 #ifdef CONFIG_NET_CLS_IND
56 	int			ifindex;
57 #endif
58 	u8			fshift;
59 	struct tcf_result	res;
60 	struct tc_u_hnode __rcu	*ht_down;
61 #ifdef CONFIG_CLS_U32_PERF
62 	struct tc_u32_pcnt __percpu *pf;
63 #endif
64 	u32			flags;
65 #ifdef CONFIG_CLS_U32_MARK
66 	u32			val;
67 	u32			mask;
68 	u32 __percpu		*pcpu_success;
69 #endif
70 	struct tcf_proto	*tp;
71 	union {
72 		struct work_struct	work;
73 		struct rcu_head		rcu;
74 	};
75 	/* The 'sel' field MUST be the last field in structure to allow for
76 	 * tc_u32_keys allocated at end of structure.
77 	 */
78 	struct tc_u32_sel	sel;
79 };
80 
81 struct tc_u_hnode {
82 	struct tc_u_hnode __rcu	*next;
83 	u32			handle;
84 	u32			prio;
85 	struct tc_u_common	*tp_c;
86 	int			refcnt;
87 	unsigned int		divisor;
88 	struct idr		handle_idr;
89 	struct rcu_head		rcu;
90 	u32			flags;
91 	/* The 'ht' field MUST be the last field in structure to allow for
92 	 * more entries allocated at end of structure.
93 	 */
94 	struct tc_u_knode __rcu	*ht[1];
95 };
96 
97 struct tc_u_common {
98 	struct tc_u_hnode __rcu	*hlist;
99 	void			*ptr;
100 	int			refcnt;
101 	struct idr		handle_idr;
102 	struct hlist_node	hnode;
103 	struct rcu_head		rcu;
104 };
105 
106 static inline unsigned int u32_hash_fold(__be32 key,
107 					 const struct tc_u32_sel *sel,
108 					 u8 fshift)
109 {
110 	unsigned int h = ntohl(key & sel->hmask) >> fshift;
111 
112 	return h;
113 }
114 
115 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
116 			struct tcf_result *res)
117 {
118 	struct {
119 		struct tc_u_knode *knode;
120 		unsigned int	  off;
121 	} stack[TC_U32_MAXDEPTH];
122 
123 	struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
124 	unsigned int off = skb_network_offset(skb);
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 = rcu_dereference_bh(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 		__this_cpu_inc(n->pf->rcnt);
143 		j = 0;
144 #endif
145 
146 		if (tc_skip_sw(n->flags)) {
147 			n = rcu_dereference_bh(n->next);
148 			goto next_knode;
149 		}
150 
151 #ifdef CONFIG_CLS_U32_MARK
152 		if ((skb->mark & n->mask) != n->val) {
153 			n = rcu_dereference_bh(n->next);
154 			goto next_knode;
155 		} else {
156 			__this_cpu_inc(*n->pcpu_success);
157 		}
158 #endif
159 
160 		for (i = n->sel.nkeys; i > 0; i--, key++) {
161 			int toff = off + key->off + (off2 & key->offmask);
162 			__be32 *data, hdata;
163 
164 			if (skb_headroom(skb) + toff > INT_MAX)
165 				goto out;
166 
167 			data = skb_header_pointer(skb, toff, 4, &hdata);
168 			if (!data)
169 				goto out;
170 			if ((*data ^ key->val) & key->mask) {
171 				n = rcu_dereference_bh(n->next);
172 				goto next_knode;
173 			}
174 #ifdef CONFIG_CLS_U32_PERF
175 			__this_cpu_inc(n->pf->kcnts[j]);
176 			j++;
177 #endif
178 		}
179 
180 		ht = rcu_dereference_bh(n->ht_down);
181 		if (!ht) {
182 check_terminal:
183 			if (n->sel.flags & TC_U32_TERMINAL) {
184 
185 				*res = n->res;
186 #ifdef CONFIG_NET_CLS_IND
187 				if (!tcf_match_indev(skb, n->ifindex)) {
188 					n = rcu_dereference_bh(n->next);
189 					goto next_knode;
190 				}
191 #endif
192 #ifdef CONFIG_CLS_U32_PERF
193 				__this_cpu_inc(n->pf->rhit);
194 #endif
195 				r = tcf_exts_exec(skb, &n->exts, res);
196 				if (r < 0) {
197 					n = rcu_dereference_bh(n->next);
198 					goto next_knode;
199 				}
200 
201 				return r;
202 			}
203 			n = rcu_dereference_bh(n->next);
204 			goto next_knode;
205 		}
206 
207 		/* PUSH */
208 		if (sdepth >= TC_U32_MAXDEPTH)
209 			goto deadloop;
210 		stack[sdepth].knode = n;
211 		stack[sdepth].off = off;
212 		sdepth++;
213 
214 		ht = rcu_dereference_bh(n->ht_down);
215 		sel = 0;
216 		if (ht->divisor) {
217 			__be32 *data, hdata;
218 
219 			data = skb_header_pointer(skb, off + n->sel.hoff, 4,
220 						  &hdata);
221 			if (!data)
222 				goto out;
223 			sel = ht->divisor & u32_hash_fold(*data, &n->sel,
224 							  n->fshift);
225 		}
226 		if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
227 			goto next_ht;
228 
229 		if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
230 			off2 = n->sel.off + 3;
231 			if (n->sel.flags & TC_U32_VAROFFSET) {
232 				__be16 *data, hdata;
233 
234 				data = skb_header_pointer(skb,
235 							  off + n->sel.offoff,
236 							  2, &hdata);
237 				if (!data)
238 					goto out;
239 				off2 += ntohs(n->sel.offmask & *data) >>
240 					n->sel.offshift;
241 			}
242 			off2 &= ~3;
243 		}
244 		if (n->sel.flags & TC_U32_EAT) {
245 			off += off2;
246 			off2 = 0;
247 		}
248 
249 		if (off < skb->len)
250 			goto next_ht;
251 	}
252 
253 	/* POP */
254 	if (sdepth--) {
255 		n = stack[sdepth].knode;
256 		ht = rcu_dereference_bh(n->ht_up);
257 		off = stack[sdepth].off;
258 		goto check_terminal;
259 	}
260 out:
261 	return -1;
262 
263 deadloop:
264 	net_warn_ratelimited("cls_u32: dead loop\n");
265 	return -1;
266 }
267 
268 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
269 {
270 	struct tc_u_hnode *ht;
271 
272 	for (ht = rtnl_dereference(tp_c->hlist);
273 	     ht;
274 	     ht = rtnl_dereference(ht->next))
275 		if (ht->handle == handle)
276 			break;
277 
278 	return ht;
279 }
280 
281 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
282 {
283 	unsigned int sel;
284 	struct tc_u_knode *n = NULL;
285 
286 	sel = TC_U32_HASH(handle);
287 	if (sel > ht->divisor)
288 		goto out;
289 
290 	for (n = rtnl_dereference(ht->ht[sel]);
291 	     n;
292 	     n = rtnl_dereference(n->next))
293 		if (n->handle == handle)
294 			break;
295 out:
296 	return n;
297 }
298 
299 
300 static void *u32_get(struct tcf_proto *tp, u32 handle)
301 {
302 	struct tc_u_hnode *ht;
303 	struct tc_u_common *tp_c = tp->data;
304 
305 	if (TC_U32_HTID(handle) == TC_U32_ROOT)
306 		ht = rtnl_dereference(tp->root);
307 	else
308 		ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
309 
310 	if (!ht)
311 		return NULL;
312 
313 	if (TC_U32_KEY(handle) == 0)
314 		return ht;
315 
316 	return u32_lookup_key(ht, handle);
317 }
318 
319 /* Protected by rtnl lock */
320 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
321 {
322 	int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
323 	if (id < 0)
324 		return 0;
325 	return (id | 0x800U) << 20;
326 }
327 
328 static struct hlist_head *tc_u_common_hash;
329 
330 #define U32_HASH_SHIFT 10
331 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
332 
333 static void *tc_u_common_ptr(const struct tcf_proto *tp)
334 {
335 	struct tcf_block *block = tp->chain->block;
336 
337 	/* The block sharing is currently supported only
338 	 * for classless qdiscs. In that case we use block
339 	 * for tc_u_common identification. In case the
340 	 * block is not shared, block->q is a valid pointer
341 	 * and we can use that. That works for classful qdiscs.
342 	 */
343 	if (tcf_block_shared(block))
344 		return block;
345 	else
346 		return block->q;
347 }
348 
349 static unsigned int tc_u_hash(const struct tcf_proto *tp)
350 {
351 	return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT);
352 }
353 
354 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
355 {
356 	struct tc_u_common *tc;
357 	unsigned int h;
358 
359 	h = tc_u_hash(tp);
360 	hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
361 		if (tc->ptr == tc_u_common_ptr(tp))
362 			return tc;
363 	}
364 	return NULL;
365 }
366 
367 static int u32_init(struct tcf_proto *tp)
368 {
369 	struct tc_u_hnode *root_ht;
370 	struct tc_u_common *tp_c;
371 	unsigned int h;
372 
373 	tp_c = tc_u_common_find(tp);
374 
375 	root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
376 	if (root_ht == NULL)
377 		return -ENOBUFS;
378 
379 	root_ht->refcnt++;
380 	root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
381 	root_ht->prio = tp->prio;
382 	idr_init(&root_ht->handle_idr);
383 
384 	if (tp_c == NULL) {
385 		tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
386 		if (tp_c == NULL) {
387 			kfree(root_ht);
388 			return -ENOBUFS;
389 		}
390 		tp_c->ptr = tc_u_common_ptr(tp);
391 		INIT_HLIST_NODE(&tp_c->hnode);
392 		idr_init(&tp_c->handle_idr);
393 
394 		h = tc_u_hash(tp);
395 		hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
396 	}
397 
398 	tp_c->refcnt++;
399 	RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
400 	rcu_assign_pointer(tp_c->hlist, root_ht);
401 	root_ht->tp_c = tp_c;
402 
403 	rcu_assign_pointer(tp->root, root_ht);
404 	tp->data = tp_c;
405 	return 0;
406 }
407 
408 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
409 			   bool free_pf)
410 {
411 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
412 
413 	tcf_exts_destroy(&n->exts);
414 	tcf_exts_put_net(&n->exts);
415 	if (ht && --ht->refcnt == 0)
416 		kfree(ht);
417 #ifdef CONFIG_CLS_U32_PERF
418 	if (free_pf)
419 		free_percpu(n->pf);
420 #endif
421 #ifdef CONFIG_CLS_U32_MARK
422 	if (free_pf)
423 		free_percpu(n->pcpu_success);
424 #endif
425 	kfree(n);
426 	return 0;
427 }
428 
429 /* u32_delete_key_rcu should be called when free'ing a copied
430  * version of a tc_u_knode obtained from u32_init_knode(). When
431  * copies are obtained from u32_init_knode() the statistics are
432  * shared between the old and new copies to allow readers to
433  * continue to update the statistics during the copy. To support
434  * this the u32_delete_key_rcu variant does not free the percpu
435  * statistics.
436  */
437 static void u32_delete_key_work(struct work_struct *work)
438 {
439 	struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
440 
441 	rtnl_lock();
442 	u32_destroy_key(key->tp, key, false);
443 	rtnl_unlock();
444 }
445 
446 static void u32_delete_key_rcu(struct rcu_head *rcu)
447 {
448 	struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
449 
450 	INIT_WORK(&key->work, u32_delete_key_work);
451 	tcf_queue_work(&key->work);
452 }
453 
454 /* u32_delete_key_freepf_rcu is the rcu callback variant
455  * that free's the entire structure including the statistics
456  * percpu variables. Only use this if the key is not a copy
457  * returned by u32_init_knode(). See u32_delete_key_rcu()
458  * for the variant that should be used with keys return from
459  * u32_init_knode()
460  */
461 static void u32_delete_key_freepf_work(struct work_struct *work)
462 {
463 	struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
464 
465 	rtnl_lock();
466 	u32_destroy_key(key->tp, key, true);
467 	rtnl_unlock();
468 }
469 
470 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
471 {
472 	struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
473 
474 	INIT_WORK(&key->work, u32_delete_key_freepf_work);
475 	tcf_queue_work(&key->work);
476 }
477 
478 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
479 {
480 	struct tc_u_knode __rcu **kp;
481 	struct tc_u_knode *pkp;
482 	struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
483 
484 	if (ht) {
485 		kp = &ht->ht[TC_U32_HASH(key->handle)];
486 		for (pkp = rtnl_dereference(*kp); pkp;
487 		     kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
488 			if (pkp == key) {
489 				RCU_INIT_POINTER(*kp, key->next);
490 
491 				tcf_unbind_filter(tp, &key->res);
492 				tcf_exts_get_net(&key->exts);
493 				call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
494 				return 0;
495 			}
496 		}
497 	}
498 	WARN_ON(1);
499 	return 0;
500 }
501 
502 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
503 			       struct netlink_ext_ack *extack)
504 {
505 	struct tcf_block *block = tp->chain->block;
506 	struct tc_cls_u32_offload cls_u32 = {};
507 
508 	tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
509 	cls_u32.command = TC_CLSU32_DELETE_HNODE;
510 	cls_u32.hnode.divisor = h->divisor;
511 	cls_u32.hnode.handle = h->handle;
512 	cls_u32.hnode.prio = h->prio;
513 
514 	tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
515 }
516 
517 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
518 				u32 flags, struct netlink_ext_ack *extack)
519 {
520 	struct tcf_block *block = tp->chain->block;
521 	struct tc_cls_u32_offload cls_u32 = {};
522 	bool skip_sw = tc_skip_sw(flags);
523 	bool offloaded = false;
524 	int err;
525 
526 	tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
527 	cls_u32.command = TC_CLSU32_NEW_HNODE;
528 	cls_u32.hnode.divisor = h->divisor;
529 	cls_u32.hnode.handle = h->handle;
530 	cls_u32.hnode.prio = h->prio;
531 
532 	err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
533 	if (err < 0) {
534 		u32_clear_hw_hnode(tp, h, NULL);
535 		return err;
536 	} else if (err > 0) {
537 		offloaded = true;
538 	}
539 
540 	if (skip_sw && !offloaded)
541 		return -EINVAL;
542 
543 	return 0;
544 }
545 
546 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
547 				struct netlink_ext_ack *extack)
548 {
549 	struct tcf_block *block = tp->chain->block;
550 	struct tc_cls_u32_offload cls_u32 = {};
551 
552 	tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
553 	cls_u32.command = TC_CLSU32_DELETE_KNODE;
554 	cls_u32.knode.handle = n->handle;
555 
556 	tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
557 	tcf_block_offload_dec(block, &n->flags);
558 }
559 
560 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
561 				u32 flags, struct netlink_ext_ack *extack)
562 {
563 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
564 	struct tcf_block *block = tp->chain->block;
565 	struct tc_cls_u32_offload cls_u32 = {};
566 	bool skip_sw = tc_skip_sw(flags);
567 	int err;
568 
569 	tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
570 	cls_u32.command = TC_CLSU32_REPLACE_KNODE;
571 	cls_u32.knode.handle = n->handle;
572 	cls_u32.knode.fshift = n->fshift;
573 #ifdef CONFIG_CLS_U32_MARK
574 	cls_u32.knode.val = n->val;
575 	cls_u32.knode.mask = n->mask;
576 #else
577 	cls_u32.knode.val = 0;
578 	cls_u32.knode.mask = 0;
579 #endif
580 	cls_u32.knode.sel = &n->sel;
581 	cls_u32.knode.exts = &n->exts;
582 	if (n->ht_down)
583 		cls_u32.knode.link_handle = ht->handle;
584 
585 	err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
586 	if (err < 0) {
587 		u32_remove_hw_knode(tp, n, NULL);
588 		return err;
589 	} else if (err > 0) {
590 		tcf_block_offload_inc(block, &n->flags);
591 	}
592 
593 	if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
594 		return -EINVAL;
595 
596 	return 0;
597 }
598 
599 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
600 			    struct netlink_ext_ack *extack)
601 {
602 	struct tc_u_knode *n;
603 	unsigned int h;
604 
605 	for (h = 0; h <= ht->divisor; h++) {
606 		while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
607 			RCU_INIT_POINTER(ht->ht[h],
608 					 rtnl_dereference(n->next));
609 			tcf_unbind_filter(tp, &n->res);
610 			u32_remove_hw_knode(tp, n, extack);
611 			idr_remove(&ht->handle_idr, n->handle);
612 			if (tcf_exts_get_net(&n->exts))
613 				call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
614 			else
615 				u32_destroy_key(n->tp, n, true);
616 		}
617 	}
618 }
619 
620 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
621 			     struct netlink_ext_ack *extack)
622 {
623 	struct tc_u_common *tp_c = tp->data;
624 	struct tc_u_hnode __rcu **hn;
625 	struct tc_u_hnode *phn;
626 
627 	WARN_ON(ht->refcnt);
628 
629 	u32_clear_hnode(tp, ht, extack);
630 
631 	hn = &tp_c->hlist;
632 	for (phn = rtnl_dereference(*hn);
633 	     phn;
634 	     hn = &phn->next, phn = rtnl_dereference(*hn)) {
635 		if (phn == ht) {
636 			u32_clear_hw_hnode(tp, ht, extack);
637 			idr_destroy(&ht->handle_idr);
638 			idr_remove(&tp_c->handle_idr, ht->handle);
639 			RCU_INIT_POINTER(*hn, ht->next);
640 			kfree_rcu(ht, rcu);
641 			return 0;
642 		}
643 	}
644 
645 	return -ENOENT;
646 }
647 
648 static bool ht_empty(struct tc_u_hnode *ht)
649 {
650 	unsigned int h;
651 
652 	for (h = 0; h <= ht->divisor; h++)
653 		if (rcu_access_pointer(ht->ht[h]))
654 			return false;
655 
656 	return true;
657 }
658 
659 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
660 {
661 	struct tc_u_common *tp_c = tp->data;
662 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
663 
664 	WARN_ON(root_ht == NULL);
665 
666 	if (root_ht && --root_ht->refcnt == 0)
667 		u32_destroy_hnode(tp, root_ht, extack);
668 
669 	if (--tp_c->refcnt == 0) {
670 		struct tc_u_hnode *ht;
671 
672 		hlist_del(&tp_c->hnode);
673 
674 		while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
675 			u32_clear_hnode(tp, ht, extack);
676 			RCU_INIT_POINTER(tp_c->hlist, ht->next);
677 
678 			/* u32_destroy_key() will later free ht for us, if it's
679 			 * still referenced by some knode
680 			 */
681 			if (--ht->refcnt == 0)
682 				kfree_rcu(ht, rcu);
683 		}
684 
685 		idr_destroy(&tp_c->handle_idr);
686 		kfree(tp_c);
687 	}
688 
689 	tp->data = NULL;
690 }
691 
692 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
693 		      struct netlink_ext_ack *extack)
694 {
695 	struct tc_u_hnode *ht = arg;
696 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
697 	struct tc_u_common *tp_c = tp->data;
698 	int ret = 0;
699 
700 	if (ht == NULL)
701 		goto out;
702 
703 	if (TC_U32_KEY(ht->handle)) {
704 		u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
705 		ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
706 		goto out;
707 	}
708 
709 	if (root_ht == ht) {
710 		NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
711 		return -EINVAL;
712 	}
713 
714 	if (ht->refcnt == 1) {
715 		ht->refcnt--;
716 		u32_destroy_hnode(tp, ht, extack);
717 	} else {
718 		NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
719 		return -EBUSY;
720 	}
721 
722 out:
723 	*last = true;
724 	if (root_ht) {
725 		if (root_ht->refcnt > 1) {
726 			*last = false;
727 			goto ret;
728 		}
729 		if (root_ht->refcnt == 1) {
730 			if (!ht_empty(root_ht)) {
731 				*last = false;
732 				goto ret;
733 			}
734 		}
735 	}
736 
737 	if (tp_c->refcnt > 1) {
738 		*last = false;
739 		goto ret;
740 	}
741 
742 	if (tp_c->refcnt == 1) {
743 		struct tc_u_hnode *ht;
744 
745 		for (ht = rtnl_dereference(tp_c->hlist);
746 		     ht;
747 		     ht = rtnl_dereference(ht->next))
748 			if (!ht_empty(ht)) {
749 				*last = false;
750 				break;
751 			}
752 	}
753 
754 ret:
755 	return ret;
756 }
757 
758 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
759 {
760 	u32 index = htid | 0x800;
761 	u32 max = htid | 0xFFF;
762 
763 	if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
764 		index = htid + 1;
765 		if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
766 				 GFP_KERNEL))
767 			index = max;
768 	}
769 
770 	return index;
771 }
772 
773 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
774 	[TCA_U32_CLASSID]	= { .type = NLA_U32 },
775 	[TCA_U32_HASH]		= { .type = NLA_U32 },
776 	[TCA_U32_LINK]		= { .type = NLA_U32 },
777 	[TCA_U32_DIVISOR]	= { .type = NLA_U32 },
778 	[TCA_U32_SEL]		= { .len = sizeof(struct tc_u32_sel) },
779 	[TCA_U32_INDEV]		= { .type = NLA_STRING, .len = IFNAMSIZ },
780 	[TCA_U32_MARK]		= { .len = sizeof(struct tc_u32_mark) },
781 	[TCA_U32_FLAGS]		= { .type = NLA_U32 },
782 };
783 
784 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
785 			 unsigned long base, struct tc_u_hnode *ht,
786 			 struct tc_u_knode *n, struct nlattr **tb,
787 			 struct nlattr *est, bool ovr,
788 			 struct netlink_ext_ack *extack)
789 {
790 	int err;
791 
792 	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
793 	if (err < 0)
794 		return err;
795 
796 	if (tb[TCA_U32_LINK]) {
797 		u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
798 		struct tc_u_hnode *ht_down = NULL, *ht_old;
799 
800 		if (TC_U32_KEY(handle)) {
801 			NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
802 			return -EINVAL;
803 		}
804 
805 		if (handle) {
806 			ht_down = u32_lookup_ht(ht->tp_c, handle);
807 
808 			if (!ht_down) {
809 				NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
810 				return -EINVAL;
811 			}
812 			ht_down->refcnt++;
813 		}
814 
815 		ht_old = rtnl_dereference(n->ht_down);
816 		rcu_assign_pointer(n->ht_down, ht_down);
817 
818 		if (ht_old)
819 			ht_old->refcnt--;
820 	}
821 	if (tb[TCA_U32_CLASSID]) {
822 		n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
823 		tcf_bind_filter(tp, &n->res, base);
824 	}
825 
826 #ifdef CONFIG_NET_CLS_IND
827 	if (tb[TCA_U32_INDEV]) {
828 		int ret;
829 		ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
830 		if (ret < 0)
831 			return -EINVAL;
832 		n->ifindex = ret;
833 	}
834 #endif
835 	return 0;
836 }
837 
838 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
839 			      struct tc_u_knode *n)
840 {
841 	struct tc_u_knode __rcu **ins;
842 	struct tc_u_knode *pins;
843 	struct tc_u_hnode *ht;
844 
845 	if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
846 		ht = rtnl_dereference(tp->root);
847 	else
848 		ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
849 
850 	ins = &ht->ht[TC_U32_HASH(n->handle)];
851 
852 	/* The node must always exist for it to be replaced if this is not the
853 	 * case then something went very wrong elsewhere.
854 	 */
855 	for (pins = rtnl_dereference(*ins); ;
856 	     ins = &pins->next, pins = rtnl_dereference(*ins))
857 		if (pins->handle == n->handle)
858 			break;
859 
860 	idr_replace(&ht->handle_idr, n, n->handle);
861 	RCU_INIT_POINTER(n->next, pins->next);
862 	rcu_assign_pointer(*ins, n);
863 }
864 
865 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
866 					 struct tc_u_knode *n)
867 {
868 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
869 	struct tc_u32_sel *s = &n->sel;
870 	struct tc_u_knode *new;
871 
872 	new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
873 		      GFP_KERNEL);
874 
875 	if (!new)
876 		return NULL;
877 
878 	RCU_INIT_POINTER(new->next, n->next);
879 	new->handle = n->handle;
880 	RCU_INIT_POINTER(new->ht_up, n->ht_up);
881 
882 #ifdef CONFIG_NET_CLS_IND
883 	new->ifindex = n->ifindex;
884 #endif
885 	new->fshift = n->fshift;
886 	new->res = n->res;
887 	new->flags = n->flags;
888 	RCU_INIT_POINTER(new->ht_down, ht);
889 
890 	/* bump reference count as long as we hold pointer to structure */
891 	if (ht)
892 		ht->refcnt++;
893 
894 #ifdef CONFIG_CLS_U32_PERF
895 	/* Statistics may be incremented by readers during update
896 	 * so we must keep them in tact. When the node is later destroyed
897 	 * a special destroy call must be made to not free the pf memory.
898 	 */
899 	new->pf = n->pf;
900 #endif
901 
902 #ifdef CONFIG_CLS_U32_MARK
903 	new->val = n->val;
904 	new->mask = n->mask;
905 	/* Similarly success statistics must be moved as pointers */
906 	new->pcpu_success = n->pcpu_success;
907 #endif
908 	new->tp = tp;
909 	memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
910 
911 	if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
912 		kfree(new);
913 		return NULL;
914 	}
915 
916 	return new;
917 }
918 
919 static int u32_change(struct net *net, struct sk_buff *in_skb,
920 		      struct tcf_proto *tp, unsigned long base, u32 handle,
921 		      struct nlattr **tca, void **arg, bool ovr,
922 		      struct netlink_ext_ack *extack)
923 {
924 	struct tc_u_common *tp_c = tp->data;
925 	struct tc_u_hnode *ht;
926 	struct tc_u_knode *n;
927 	struct tc_u32_sel *s;
928 	struct nlattr *opt = tca[TCA_OPTIONS];
929 	struct nlattr *tb[TCA_U32_MAX + 1];
930 	u32 htid, flags = 0;
931 	int err;
932 #ifdef CONFIG_CLS_U32_PERF
933 	size_t size;
934 #endif
935 
936 	if (!opt) {
937 		if (handle) {
938 			NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
939 			return -EINVAL;
940 		} else {
941 			return 0;
942 		}
943 	}
944 
945 	err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
946 	if (err < 0)
947 		return err;
948 
949 	if (tb[TCA_U32_FLAGS]) {
950 		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
951 		if (!tc_flags_valid(flags)) {
952 			NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
953 			return -EINVAL;
954 		}
955 	}
956 
957 	n = *arg;
958 	if (n) {
959 		struct tc_u_knode *new;
960 
961 		if (TC_U32_KEY(n->handle) == 0) {
962 			NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
963 			return -EINVAL;
964 		}
965 
966 		if ((n->flags ^ flags) &
967 		    ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
968 			NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
969 			return -EINVAL;
970 		}
971 
972 		new = u32_init_knode(tp, n);
973 		if (!new)
974 			return -ENOMEM;
975 
976 		err = u32_set_parms(net, tp, base,
977 				    rtnl_dereference(n->ht_up), new, tb,
978 				    tca[TCA_RATE], ovr, extack);
979 
980 		if (err) {
981 			u32_destroy_key(tp, new, false);
982 			return err;
983 		}
984 
985 		err = u32_replace_hw_knode(tp, new, flags, extack);
986 		if (err) {
987 			u32_destroy_key(tp, new, false);
988 			return err;
989 		}
990 
991 		if (!tc_in_hw(new->flags))
992 			new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
993 
994 		u32_replace_knode(tp, tp_c, new);
995 		tcf_unbind_filter(tp, &n->res);
996 		tcf_exts_get_net(&n->exts);
997 		call_rcu(&n->rcu, u32_delete_key_rcu);
998 		return 0;
999 	}
1000 
1001 	if (tb[TCA_U32_DIVISOR]) {
1002 		unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
1003 
1004 		if (--divisor > 0x100) {
1005 			NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
1006 			return -EINVAL;
1007 		}
1008 		if (TC_U32_KEY(handle)) {
1009 			NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
1010 			return -EINVAL;
1011 		}
1012 		ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1013 		if (ht == NULL)
1014 			return -ENOBUFS;
1015 		if (handle == 0) {
1016 			handle = gen_new_htid(tp->data, ht);
1017 			if (handle == 0) {
1018 				kfree(ht);
1019 				return -ENOMEM;
1020 			}
1021 		} else {
1022 			err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1023 					    handle, GFP_KERNEL);
1024 			if (err) {
1025 				kfree(ht);
1026 				return err;
1027 			}
1028 		}
1029 		ht->tp_c = tp_c;
1030 		ht->refcnt = 1;
1031 		ht->divisor = divisor;
1032 		ht->handle = handle;
1033 		ht->prio = tp->prio;
1034 		idr_init(&ht->handle_idr);
1035 		ht->flags = flags;
1036 
1037 		err = u32_replace_hw_hnode(tp, ht, flags, extack);
1038 		if (err) {
1039 			idr_remove(&tp_c->handle_idr, handle);
1040 			kfree(ht);
1041 			return err;
1042 		}
1043 
1044 		RCU_INIT_POINTER(ht->next, tp_c->hlist);
1045 		rcu_assign_pointer(tp_c->hlist, ht);
1046 		*arg = ht;
1047 
1048 		return 0;
1049 	}
1050 
1051 	if (tb[TCA_U32_HASH]) {
1052 		htid = nla_get_u32(tb[TCA_U32_HASH]);
1053 		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1054 			ht = rtnl_dereference(tp->root);
1055 			htid = ht->handle;
1056 		} else {
1057 			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1058 			if (!ht) {
1059 				NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1060 				return -EINVAL;
1061 			}
1062 		}
1063 	} else {
1064 		ht = rtnl_dereference(tp->root);
1065 		htid = ht->handle;
1066 	}
1067 
1068 	if (ht->divisor < TC_U32_HASH(htid)) {
1069 		NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1070 		return -EINVAL;
1071 	}
1072 
1073 	if (handle) {
1074 		if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1075 			NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1076 			return -EINVAL;
1077 		}
1078 		handle = htid | TC_U32_NODE(handle);
1079 		err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1080 				    GFP_KERNEL);
1081 		if (err)
1082 			return err;
1083 	} else
1084 		handle = gen_new_kid(ht, htid);
1085 
1086 	if (tb[TCA_U32_SEL] == NULL) {
1087 		NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1088 		err = -EINVAL;
1089 		goto erridr;
1090 	}
1091 
1092 	s = nla_data(tb[TCA_U32_SEL]);
1093 
1094 	n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1095 	if (n == NULL) {
1096 		err = -ENOBUFS;
1097 		goto erridr;
1098 	}
1099 
1100 #ifdef CONFIG_CLS_U32_PERF
1101 	size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1102 	n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1103 	if (!n->pf) {
1104 		err = -ENOBUFS;
1105 		goto errfree;
1106 	}
1107 #endif
1108 
1109 	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1110 	RCU_INIT_POINTER(n->ht_up, ht);
1111 	n->handle = handle;
1112 	n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1113 	n->flags = flags;
1114 	n->tp = tp;
1115 
1116 	err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1117 	if (err < 0)
1118 		goto errout;
1119 
1120 #ifdef CONFIG_CLS_U32_MARK
1121 	n->pcpu_success = alloc_percpu(u32);
1122 	if (!n->pcpu_success) {
1123 		err = -ENOMEM;
1124 		goto errout;
1125 	}
1126 
1127 	if (tb[TCA_U32_MARK]) {
1128 		struct tc_u32_mark *mark;
1129 
1130 		mark = nla_data(tb[TCA_U32_MARK]);
1131 		n->val = mark->val;
1132 		n->mask = mark->mask;
1133 	}
1134 #endif
1135 
1136 	err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1137 			    extack);
1138 	if (err == 0) {
1139 		struct tc_u_knode __rcu **ins;
1140 		struct tc_u_knode *pins;
1141 
1142 		err = u32_replace_hw_knode(tp, n, flags, extack);
1143 		if (err)
1144 			goto errhw;
1145 
1146 		if (!tc_in_hw(n->flags))
1147 			n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1148 
1149 		ins = &ht->ht[TC_U32_HASH(handle)];
1150 		for (pins = rtnl_dereference(*ins); pins;
1151 		     ins = &pins->next, pins = rtnl_dereference(*ins))
1152 			if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1153 				break;
1154 
1155 		RCU_INIT_POINTER(n->next, pins);
1156 		rcu_assign_pointer(*ins, n);
1157 		*arg = n;
1158 		return 0;
1159 	}
1160 
1161 errhw:
1162 #ifdef CONFIG_CLS_U32_MARK
1163 	free_percpu(n->pcpu_success);
1164 #endif
1165 
1166 errout:
1167 	tcf_exts_destroy(&n->exts);
1168 #ifdef CONFIG_CLS_U32_PERF
1169 errfree:
1170 	free_percpu(n->pf);
1171 #endif
1172 	kfree(n);
1173 erridr:
1174 	idr_remove(&ht->handle_idr, handle);
1175 	return err;
1176 }
1177 
1178 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1179 {
1180 	struct tc_u_common *tp_c = tp->data;
1181 	struct tc_u_hnode *ht;
1182 	struct tc_u_knode *n;
1183 	unsigned int h;
1184 
1185 	if (arg->stop)
1186 		return;
1187 
1188 	for (ht = rtnl_dereference(tp_c->hlist);
1189 	     ht;
1190 	     ht = rtnl_dereference(ht->next)) {
1191 		if (ht->prio != tp->prio)
1192 			continue;
1193 		if (arg->count >= arg->skip) {
1194 			if (arg->fn(tp, ht, arg) < 0) {
1195 				arg->stop = 1;
1196 				return;
1197 			}
1198 		}
1199 		arg->count++;
1200 		for (h = 0; h <= ht->divisor; h++) {
1201 			for (n = rtnl_dereference(ht->ht[h]);
1202 			     n;
1203 			     n = rtnl_dereference(n->next)) {
1204 				if (arg->count < arg->skip) {
1205 					arg->count++;
1206 					continue;
1207 				}
1208 				if (arg->fn(tp, n, arg) < 0) {
1209 					arg->stop = 1;
1210 					return;
1211 				}
1212 				arg->count++;
1213 			}
1214 		}
1215 	}
1216 }
1217 
1218 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1219 {
1220 	struct tc_u_knode *n = fh;
1221 
1222 	if (n && n->res.classid == classid)
1223 		n->res.class = cl;
1224 }
1225 
1226 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1227 		    struct sk_buff *skb, struct tcmsg *t)
1228 {
1229 	struct tc_u_knode *n = fh;
1230 	struct tc_u_hnode *ht_up, *ht_down;
1231 	struct nlattr *nest;
1232 
1233 	if (n == NULL)
1234 		return skb->len;
1235 
1236 	t->tcm_handle = n->handle;
1237 
1238 	nest = nla_nest_start(skb, TCA_OPTIONS);
1239 	if (nest == NULL)
1240 		goto nla_put_failure;
1241 
1242 	if (TC_U32_KEY(n->handle) == 0) {
1243 		struct tc_u_hnode *ht = fh;
1244 		u32 divisor = ht->divisor + 1;
1245 
1246 		if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1247 			goto nla_put_failure;
1248 	} else {
1249 #ifdef CONFIG_CLS_U32_PERF
1250 		struct tc_u32_pcnt *gpf;
1251 		int cpu;
1252 #endif
1253 
1254 		if (nla_put(skb, TCA_U32_SEL,
1255 			    sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1256 			    &n->sel))
1257 			goto nla_put_failure;
1258 
1259 		ht_up = rtnl_dereference(n->ht_up);
1260 		if (ht_up) {
1261 			u32 htid = n->handle & 0xFFFFF000;
1262 			if (nla_put_u32(skb, TCA_U32_HASH, htid))
1263 				goto nla_put_failure;
1264 		}
1265 		if (n->res.classid &&
1266 		    nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1267 			goto nla_put_failure;
1268 
1269 		ht_down = rtnl_dereference(n->ht_down);
1270 		if (ht_down &&
1271 		    nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1272 			goto nla_put_failure;
1273 
1274 		if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1275 			goto nla_put_failure;
1276 
1277 #ifdef CONFIG_CLS_U32_MARK
1278 		if ((n->val || n->mask)) {
1279 			struct tc_u32_mark mark = {.val = n->val,
1280 						   .mask = n->mask,
1281 						   .success = 0};
1282 			int cpum;
1283 
1284 			for_each_possible_cpu(cpum) {
1285 				__u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1286 
1287 				mark.success += cnt;
1288 			}
1289 
1290 			if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1291 				goto nla_put_failure;
1292 		}
1293 #endif
1294 
1295 		if (tcf_exts_dump(skb, &n->exts) < 0)
1296 			goto nla_put_failure;
1297 
1298 #ifdef CONFIG_NET_CLS_IND
1299 		if (n->ifindex) {
1300 			struct net_device *dev;
1301 			dev = __dev_get_by_index(net, n->ifindex);
1302 			if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1303 				goto nla_put_failure;
1304 		}
1305 #endif
1306 #ifdef CONFIG_CLS_U32_PERF
1307 		gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1308 			      n->sel.nkeys * sizeof(u64),
1309 			      GFP_KERNEL);
1310 		if (!gpf)
1311 			goto nla_put_failure;
1312 
1313 		for_each_possible_cpu(cpu) {
1314 			int i;
1315 			struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1316 
1317 			gpf->rcnt += pf->rcnt;
1318 			gpf->rhit += pf->rhit;
1319 			for (i = 0; i < n->sel.nkeys; i++)
1320 				gpf->kcnts[i] += pf->kcnts[i];
1321 		}
1322 
1323 		if (nla_put_64bit(skb, TCA_U32_PCNT,
1324 				  sizeof(struct tc_u32_pcnt) +
1325 				  n->sel.nkeys * sizeof(u64),
1326 				  gpf, TCA_U32_PAD)) {
1327 			kfree(gpf);
1328 			goto nla_put_failure;
1329 		}
1330 		kfree(gpf);
1331 #endif
1332 	}
1333 
1334 	nla_nest_end(skb, nest);
1335 
1336 	if (TC_U32_KEY(n->handle))
1337 		if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1338 			goto nla_put_failure;
1339 	return skb->len;
1340 
1341 nla_put_failure:
1342 	nla_nest_cancel(skb, nest);
1343 	return -1;
1344 }
1345 
1346 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1347 	.kind		=	"u32",
1348 	.classify	=	u32_classify,
1349 	.init		=	u32_init,
1350 	.destroy	=	u32_destroy,
1351 	.get		=	u32_get,
1352 	.change		=	u32_change,
1353 	.delete		=	u32_delete,
1354 	.walk		=	u32_walk,
1355 	.dump		=	u32_dump,
1356 	.bind_class	=	u32_bind_class,
1357 	.owner		=	THIS_MODULE,
1358 };
1359 
1360 static int __init init_u32(void)
1361 {
1362 	int i, ret;
1363 
1364 	pr_info("u32 classifier\n");
1365 #ifdef CONFIG_CLS_U32_PERF
1366 	pr_info("    Performance counters on\n");
1367 #endif
1368 #ifdef CONFIG_NET_CLS_IND
1369 	pr_info("    input device check on\n");
1370 #endif
1371 #ifdef CONFIG_NET_CLS_ACT
1372 	pr_info("    Actions configured\n");
1373 #endif
1374 	tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1375 					  sizeof(struct hlist_head),
1376 					  GFP_KERNEL);
1377 	if (!tc_u_common_hash)
1378 		return -ENOMEM;
1379 
1380 	for (i = 0; i < U32_HASH_SIZE; i++)
1381 		INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1382 
1383 	ret = register_tcf_proto_ops(&cls_u32_ops);
1384 	if (ret)
1385 		kvfree(tc_u_common_hash);
1386 	return ret;
1387 }
1388 
1389 static void __exit exit_u32(void)
1390 {
1391 	unregister_tcf_proto_ops(&cls_u32_ops);
1392 	kvfree(tc_u_common_hash);
1393 }
1394 
1395 module_init(init_u32)
1396 module_exit(exit_u32)
1397 MODULE_LICENSE("GPL");
1398