xref: /openbmc/linux/net/sched/cls_u32.c (revision e0f6d1a5) 
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 				idr_remove(&ht->handle_idr, key->handle);
493 				tcf_exts_get_net(&key->exts);
494 				call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
495 				return 0;
496 			}
497 		}
498 	}
499 	WARN_ON(1);
500 	return 0;
501 }
502 
503 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
504 			       struct netlink_ext_ack *extack)
505 {
506 	struct tcf_block *block = tp->chain->block;
507 	struct tc_cls_u32_offload cls_u32 = {};
508 
509 	tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
510 	cls_u32.command = TC_CLSU32_DELETE_HNODE;
511 	cls_u32.hnode.divisor = h->divisor;
512 	cls_u32.hnode.handle = h->handle;
513 	cls_u32.hnode.prio = h->prio;
514 
515 	tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
516 }
517 
518 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
519 				u32 flags, struct netlink_ext_ack *extack)
520 {
521 	struct tcf_block *block = tp->chain->block;
522 	struct tc_cls_u32_offload cls_u32 = {};
523 	bool skip_sw = tc_skip_sw(flags);
524 	bool offloaded = false;
525 	int err;
526 
527 	tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
528 	cls_u32.command = TC_CLSU32_NEW_HNODE;
529 	cls_u32.hnode.divisor = h->divisor;
530 	cls_u32.hnode.handle = h->handle;
531 	cls_u32.hnode.prio = h->prio;
532 
533 	err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
534 	if (err < 0) {
535 		u32_clear_hw_hnode(tp, h, NULL);
536 		return err;
537 	} else if (err > 0) {
538 		offloaded = true;
539 	}
540 
541 	if (skip_sw && !offloaded)
542 		return -EINVAL;
543 
544 	return 0;
545 }
546 
547 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
548 				struct netlink_ext_ack *extack)
549 {
550 	struct tcf_block *block = tp->chain->block;
551 	struct tc_cls_u32_offload cls_u32 = {};
552 
553 	tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
554 	cls_u32.command = TC_CLSU32_DELETE_KNODE;
555 	cls_u32.knode.handle = n->handle;
556 
557 	tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
558 	tcf_block_offload_dec(block, &n->flags);
559 }
560 
561 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
562 				u32 flags, struct netlink_ext_ack *extack)
563 {
564 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
565 	struct tcf_block *block = tp->chain->block;
566 	struct tc_cls_u32_offload cls_u32 = {};
567 	bool skip_sw = tc_skip_sw(flags);
568 	int err;
569 
570 	tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
571 	cls_u32.command = TC_CLSU32_REPLACE_KNODE;
572 	cls_u32.knode.handle = n->handle;
573 	cls_u32.knode.fshift = n->fshift;
574 #ifdef CONFIG_CLS_U32_MARK
575 	cls_u32.knode.val = n->val;
576 	cls_u32.knode.mask = n->mask;
577 #else
578 	cls_u32.knode.val = 0;
579 	cls_u32.knode.mask = 0;
580 #endif
581 	cls_u32.knode.sel = &n->sel;
582 	cls_u32.knode.exts = &n->exts;
583 	if (n->ht_down)
584 		cls_u32.knode.link_handle = ht->handle;
585 
586 	err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
587 	if (err < 0) {
588 		u32_remove_hw_knode(tp, n, NULL);
589 		return err;
590 	} else if (err > 0) {
591 		tcf_block_offload_inc(block, &n->flags);
592 	}
593 
594 	if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
595 		return -EINVAL;
596 
597 	return 0;
598 }
599 
600 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
601 			    struct netlink_ext_ack *extack)
602 {
603 	struct tc_u_knode *n;
604 	unsigned int h;
605 
606 	for (h = 0; h <= ht->divisor; h++) {
607 		while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
608 			RCU_INIT_POINTER(ht->ht[h],
609 					 rtnl_dereference(n->next));
610 			tcf_unbind_filter(tp, &n->res);
611 			u32_remove_hw_knode(tp, n, extack);
612 			idr_remove(&ht->handle_idr, n->handle);
613 			if (tcf_exts_get_net(&n->exts))
614 				call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
615 			else
616 				u32_destroy_key(n->tp, n, true);
617 		}
618 	}
619 }
620 
621 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
622 			     struct netlink_ext_ack *extack)
623 {
624 	struct tc_u_common *tp_c = tp->data;
625 	struct tc_u_hnode __rcu **hn;
626 	struct tc_u_hnode *phn;
627 
628 	WARN_ON(ht->refcnt);
629 
630 	u32_clear_hnode(tp, ht, extack);
631 
632 	hn = &tp_c->hlist;
633 	for (phn = rtnl_dereference(*hn);
634 	     phn;
635 	     hn = &phn->next, phn = rtnl_dereference(*hn)) {
636 		if (phn == ht) {
637 			u32_clear_hw_hnode(tp, ht, extack);
638 			idr_destroy(&ht->handle_idr);
639 			idr_remove(&tp_c->handle_idr, ht->handle);
640 			RCU_INIT_POINTER(*hn, ht->next);
641 			kfree_rcu(ht, rcu);
642 			return 0;
643 		}
644 	}
645 
646 	return -ENOENT;
647 }
648 
649 static bool ht_empty(struct tc_u_hnode *ht)
650 {
651 	unsigned int h;
652 
653 	for (h = 0; h <= ht->divisor; h++)
654 		if (rcu_access_pointer(ht->ht[h]))
655 			return false;
656 
657 	return true;
658 }
659 
660 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
661 {
662 	struct tc_u_common *tp_c = tp->data;
663 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
664 
665 	WARN_ON(root_ht == NULL);
666 
667 	if (root_ht && --root_ht->refcnt == 0)
668 		u32_destroy_hnode(tp, root_ht, extack);
669 
670 	if (--tp_c->refcnt == 0) {
671 		struct tc_u_hnode *ht;
672 
673 		hlist_del(&tp_c->hnode);
674 
675 		while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
676 			u32_clear_hnode(tp, ht, extack);
677 			RCU_INIT_POINTER(tp_c->hlist, ht->next);
678 
679 			/* u32_destroy_key() will later free ht for us, if it's
680 			 * still referenced by some knode
681 			 */
682 			if (--ht->refcnt == 0)
683 				kfree_rcu(ht, rcu);
684 		}
685 
686 		idr_destroy(&tp_c->handle_idr);
687 		kfree(tp_c);
688 	}
689 
690 	tp->data = NULL;
691 }
692 
693 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
694 		      struct netlink_ext_ack *extack)
695 {
696 	struct tc_u_hnode *ht = arg;
697 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
698 	struct tc_u_common *tp_c = tp->data;
699 	int ret = 0;
700 
701 	if (ht == NULL)
702 		goto out;
703 
704 	if (TC_U32_KEY(ht->handle)) {
705 		u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
706 		ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
707 		goto out;
708 	}
709 
710 	if (root_ht == ht) {
711 		NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
712 		return -EINVAL;
713 	}
714 
715 	if (ht->refcnt == 1) {
716 		ht->refcnt--;
717 		u32_destroy_hnode(tp, ht, extack);
718 	} else {
719 		NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
720 		return -EBUSY;
721 	}
722 
723 out:
724 	*last = true;
725 	if (root_ht) {
726 		if (root_ht->refcnt > 1) {
727 			*last = false;
728 			goto ret;
729 		}
730 		if (root_ht->refcnt == 1) {
731 			if (!ht_empty(root_ht)) {
732 				*last = false;
733 				goto ret;
734 			}
735 		}
736 	}
737 
738 	if (tp_c->refcnt > 1) {
739 		*last = false;
740 		goto ret;
741 	}
742 
743 	if (tp_c->refcnt == 1) {
744 		struct tc_u_hnode *ht;
745 
746 		for (ht = rtnl_dereference(tp_c->hlist);
747 		     ht;
748 		     ht = rtnl_dereference(ht->next))
749 			if (!ht_empty(ht)) {
750 				*last = false;
751 				break;
752 			}
753 	}
754 
755 ret:
756 	return ret;
757 }
758 
759 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
760 {
761 	u32 index = htid | 0x800;
762 	u32 max = htid | 0xFFF;
763 
764 	if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
765 		index = htid + 1;
766 		if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
767 				 GFP_KERNEL))
768 			index = max;
769 	}
770 
771 	return index;
772 }
773 
774 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
775 	[TCA_U32_CLASSID]	= { .type = NLA_U32 },
776 	[TCA_U32_HASH]		= { .type = NLA_U32 },
777 	[TCA_U32_LINK]		= { .type = NLA_U32 },
778 	[TCA_U32_DIVISOR]	= { .type = NLA_U32 },
779 	[TCA_U32_SEL]		= { .len = sizeof(struct tc_u32_sel) },
780 	[TCA_U32_INDEV]		= { .type = NLA_STRING, .len = IFNAMSIZ },
781 	[TCA_U32_MARK]		= { .len = sizeof(struct tc_u32_mark) },
782 	[TCA_U32_FLAGS]		= { .type = NLA_U32 },
783 };
784 
785 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
786 			 unsigned long base, struct tc_u_hnode *ht,
787 			 struct tc_u_knode *n, struct nlattr **tb,
788 			 struct nlattr *est, bool ovr,
789 			 struct netlink_ext_ack *extack)
790 {
791 	int err;
792 
793 	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
794 	if (err < 0)
795 		return err;
796 
797 	if (tb[TCA_U32_LINK]) {
798 		u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
799 		struct tc_u_hnode *ht_down = NULL, *ht_old;
800 
801 		if (TC_U32_KEY(handle)) {
802 			NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
803 			return -EINVAL;
804 		}
805 
806 		if (handle) {
807 			ht_down = u32_lookup_ht(ht->tp_c, handle);
808 
809 			if (!ht_down) {
810 				NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
811 				return -EINVAL;
812 			}
813 			ht_down->refcnt++;
814 		}
815 
816 		ht_old = rtnl_dereference(n->ht_down);
817 		rcu_assign_pointer(n->ht_down, ht_down);
818 
819 		if (ht_old)
820 			ht_old->refcnt--;
821 	}
822 	if (tb[TCA_U32_CLASSID]) {
823 		n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
824 		tcf_bind_filter(tp, &n->res, base);
825 	}
826 
827 #ifdef CONFIG_NET_CLS_IND
828 	if (tb[TCA_U32_INDEV]) {
829 		int ret;
830 		ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
831 		if (ret < 0)
832 			return -EINVAL;
833 		n->ifindex = ret;
834 	}
835 #endif
836 	return 0;
837 }
838 
839 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
840 			      struct tc_u_knode *n)
841 {
842 	struct tc_u_knode __rcu **ins;
843 	struct tc_u_knode *pins;
844 	struct tc_u_hnode *ht;
845 
846 	if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
847 		ht = rtnl_dereference(tp->root);
848 	else
849 		ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
850 
851 	ins = &ht->ht[TC_U32_HASH(n->handle)];
852 
853 	/* The node must always exist for it to be replaced if this is not the
854 	 * case then something went very wrong elsewhere.
855 	 */
856 	for (pins = rtnl_dereference(*ins); ;
857 	     ins = &pins->next, pins = rtnl_dereference(*ins))
858 		if (pins->handle == n->handle)
859 			break;
860 
861 	idr_replace(&ht->handle_idr, n, n->handle);
862 	RCU_INIT_POINTER(n->next, pins->next);
863 	rcu_assign_pointer(*ins, n);
864 }
865 
866 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
867 					 struct tc_u_knode *n)
868 {
869 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
870 	struct tc_u32_sel *s = &n->sel;
871 	struct tc_u_knode *new;
872 
873 	new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
874 		      GFP_KERNEL);
875 
876 	if (!new)
877 		return NULL;
878 
879 	RCU_INIT_POINTER(new->next, n->next);
880 	new->handle = n->handle;
881 	RCU_INIT_POINTER(new->ht_up, n->ht_up);
882 
883 #ifdef CONFIG_NET_CLS_IND
884 	new->ifindex = n->ifindex;
885 #endif
886 	new->fshift = n->fshift;
887 	new->res = n->res;
888 	new->flags = n->flags;
889 	RCU_INIT_POINTER(new->ht_down, ht);
890 
891 	/* bump reference count as long as we hold pointer to structure */
892 	if (ht)
893 		ht->refcnt++;
894 
895 #ifdef CONFIG_CLS_U32_PERF
896 	/* Statistics may be incremented by readers during update
897 	 * so we must keep them in tact. When the node is later destroyed
898 	 * a special destroy call must be made to not free the pf memory.
899 	 */
900 	new->pf = n->pf;
901 #endif
902 
903 #ifdef CONFIG_CLS_U32_MARK
904 	new->val = n->val;
905 	new->mask = n->mask;
906 	/* Similarly success statistics must be moved as pointers */
907 	new->pcpu_success = n->pcpu_success;
908 #endif
909 	new->tp = tp;
910 	memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
911 
912 	if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
913 		kfree(new);
914 		return NULL;
915 	}
916 
917 	return new;
918 }
919 
920 static int u32_change(struct net *net, struct sk_buff *in_skb,
921 		      struct tcf_proto *tp, unsigned long base, u32 handle,
922 		      struct nlattr **tca, void **arg, bool ovr,
923 		      struct netlink_ext_ack *extack)
924 {
925 	struct tc_u_common *tp_c = tp->data;
926 	struct tc_u_hnode *ht;
927 	struct tc_u_knode *n;
928 	struct tc_u32_sel *s;
929 	struct nlattr *opt = tca[TCA_OPTIONS];
930 	struct nlattr *tb[TCA_U32_MAX + 1];
931 	u32 htid, flags = 0;
932 	int err;
933 #ifdef CONFIG_CLS_U32_PERF
934 	size_t size;
935 #endif
936 
937 	if (!opt) {
938 		if (handle) {
939 			NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
940 			return -EINVAL;
941 		} else {
942 			return 0;
943 		}
944 	}
945 
946 	err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
947 	if (err < 0)
948 		return err;
949 
950 	if (tb[TCA_U32_FLAGS]) {
951 		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
952 		if (!tc_flags_valid(flags)) {
953 			NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
954 			return -EINVAL;
955 		}
956 	}
957 
958 	n = *arg;
959 	if (n) {
960 		struct tc_u_knode *new;
961 
962 		if (TC_U32_KEY(n->handle) == 0) {
963 			NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
964 			return -EINVAL;
965 		}
966 
967 		if ((n->flags ^ flags) &
968 		    ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
969 			NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
970 			return -EINVAL;
971 		}
972 
973 		new = u32_init_knode(tp, n);
974 		if (!new)
975 			return -ENOMEM;
976 
977 		err = u32_set_parms(net, tp, base,
978 				    rtnl_dereference(n->ht_up), new, tb,
979 				    tca[TCA_RATE], ovr, extack);
980 
981 		if (err) {
982 			u32_destroy_key(tp, new, false);
983 			return err;
984 		}
985 
986 		err = u32_replace_hw_knode(tp, new, flags, extack);
987 		if (err) {
988 			u32_destroy_key(tp, new, false);
989 			return err;
990 		}
991 
992 		if (!tc_in_hw(new->flags))
993 			new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
994 
995 		u32_replace_knode(tp, tp_c, new);
996 		tcf_unbind_filter(tp, &n->res);
997 		tcf_exts_get_net(&n->exts);
998 		call_rcu(&n->rcu, u32_delete_key_rcu);
999 		return 0;
1000 	}
1001 
1002 	if (tb[TCA_U32_DIVISOR]) {
1003 		unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
1004 
1005 		if (--divisor > 0x100) {
1006 			NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
1007 			return -EINVAL;
1008 		}
1009 		if (TC_U32_KEY(handle)) {
1010 			NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
1011 			return -EINVAL;
1012 		}
1013 		ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
1014 		if (ht == NULL)
1015 			return -ENOBUFS;
1016 		if (handle == 0) {
1017 			handle = gen_new_htid(tp->data, ht);
1018 			if (handle == 0) {
1019 				kfree(ht);
1020 				return -ENOMEM;
1021 			}
1022 		} else {
1023 			err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1024 					    handle, GFP_KERNEL);
1025 			if (err) {
1026 				kfree(ht);
1027 				return err;
1028 			}
1029 		}
1030 		ht->tp_c = tp_c;
1031 		ht->refcnt = 1;
1032 		ht->divisor = divisor;
1033 		ht->handle = handle;
1034 		ht->prio = tp->prio;
1035 		idr_init(&ht->handle_idr);
1036 		ht->flags = flags;
1037 
1038 		err = u32_replace_hw_hnode(tp, ht, flags, extack);
1039 		if (err) {
1040 			idr_remove(&tp_c->handle_idr, handle);
1041 			kfree(ht);
1042 			return err;
1043 		}
1044 
1045 		RCU_INIT_POINTER(ht->next, tp_c->hlist);
1046 		rcu_assign_pointer(tp_c->hlist, ht);
1047 		*arg = ht;
1048 
1049 		return 0;
1050 	}
1051 
1052 	if (tb[TCA_U32_HASH]) {
1053 		htid = nla_get_u32(tb[TCA_U32_HASH]);
1054 		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1055 			ht = rtnl_dereference(tp->root);
1056 			htid = ht->handle;
1057 		} else {
1058 			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1059 			if (!ht) {
1060 				NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1061 				return -EINVAL;
1062 			}
1063 		}
1064 	} else {
1065 		ht = rtnl_dereference(tp->root);
1066 		htid = ht->handle;
1067 	}
1068 
1069 	if (ht->divisor < TC_U32_HASH(htid)) {
1070 		NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1071 		return -EINVAL;
1072 	}
1073 
1074 	if (handle) {
1075 		if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1076 			NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1077 			return -EINVAL;
1078 		}
1079 		handle = htid | TC_U32_NODE(handle);
1080 		err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1081 				    GFP_KERNEL);
1082 		if (err)
1083 			return err;
1084 	} else
1085 		handle = gen_new_kid(ht, htid);
1086 
1087 	if (tb[TCA_U32_SEL] == NULL) {
1088 		NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1089 		err = -EINVAL;
1090 		goto erridr;
1091 	}
1092 
1093 	s = nla_data(tb[TCA_U32_SEL]);
1094 
1095 	n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1096 	if (n == NULL) {
1097 		err = -ENOBUFS;
1098 		goto erridr;
1099 	}
1100 
1101 #ifdef CONFIG_CLS_U32_PERF
1102 	size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1103 	n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1104 	if (!n->pf) {
1105 		err = -ENOBUFS;
1106 		goto errfree;
1107 	}
1108 #endif
1109 
1110 	memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1111 	RCU_INIT_POINTER(n->ht_up, ht);
1112 	n->handle = handle;
1113 	n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1114 	n->flags = flags;
1115 	n->tp = tp;
1116 
1117 	err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1118 	if (err < 0)
1119 		goto errout;
1120 
1121 #ifdef CONFIG_CLS_U32_MARK
1122 	n->pcpu_success = alloc_percpu(u32);
1123 	if (!n->pcpu_success) {
1124 		err = -ENOMEM;
1125 		goto errout;
1126 	}
1127 
1128 	if (tb[TCA_U32_MARK]) {
1129 		struct tc_u32_mark *mark;
1130 
1131 		mark = nla_data(tb[TCA_U32_MARK]);
1132 		n->val = mark->val;
1133 		n->mask = mark->mask;
1134 	}
1135 #endif
1136 
1137 	err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1138 			    extack);
1139 	if (err == 0) {
1140 		struct tc_u_knode __rcu **ins;
1141 		struct tc_u_knode *pins;
1142 
1143 		err = u32_replace_hw_knode(tp, n, flags, extack);
1144 		if (err)
1145 			goto errhw;
1146 
1147 		if (!tc_in_hw(n->flags))
1148 			n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1149 
1150 		ins = &ht->ht[TC_U32_HASH(handle)];
1151 		for (pins = rtnl_dereference(*ins); pins;
1152 		     ins = &pins->next, pins = rtnl_dereference(*ins))
1153 			if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1154 				break;
1155 
1156 		RCU_INIT_POINTER(n->next, pins);
1157 		rcu_assign_pointer(*ins, n);
1158 		*arg = n;
1159 		return 0;
1160 	}
1161 
1162 errhw:
1163 #ifdef CONFIG_CLS_U32_MARK
1164 	free_percpu(n->pcpu_success);
1165 #endif
1166 
1167 errout:
1168 	tcf_exts_destroy(&n->exts);
1169 #ifdef CONFIG_CLS_U32_PERF
1170 errfree:
1171 	free_percpu(n->pf);
1172 #endif
1173 	kfree(n);
1174 erridr:
1175 	idr_remove(&ht->handle_idr, handle);
1176 	return err;
1177 }
1178 
1179 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1180 {
1181 	struct tc_u_common *tp_c = tp->data;
1182 	struct tc_u_hnode *ht;
1183 	struct tc_u_knode *n;
1184 	unsigned int h;
1185 
1186 	if (arg->stop)
1187 		return;
1188 
1189 	for (ht = rtnl_dereference(tp_c->hlist);
1190 	     ht;
1191 	     ht = rtnl_dereference(ht->next)) {
1192 		if (ht->prio != tp->prio)
1193 			continue;
1194 		if (arg->count >= arg->skip) {
1195 			if (arg->fn(tp, ht, arg) < 0) {
1196 				arg->stop = 1;
1197 				return;
1198 			}
1199 		}
1200 		arg->count++;
1201 		for (h = 0; h <= ht->divisor; h++) {
1202 			for (n = rtnl_dereference(ht->ht[h]);
1203 			     n;
1204 			     n = rtnl_dereference(n->next)) {
1205 				if (arg->count < arg->skip) {
1206 					arg->count++;
1207 					continue;
1208 				}
1209 				if (arg->fn(tp, n, arg) < 0) {
1210 					arg->stop = 1;
1211 					return;
1212 				}
1213 				arg->count++;
1214 			}
1215 		}
1216 	}
1217 }
1218 
1219 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1220 {
1221 	struct tc_u_knode *n = fh;
1222 
1223 	if (n && n->res.classid == classid)
1224 		n->res.class = cl;
1225 }
1226 
1227 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1228 		    struct sk_buff *skb, struct tcmsg *t)
1229 {
1230 	struct tc_u_knode *n = fh;
1231 	struct tc_u_hnode *ht_up, *ht_down;
1232 	struct nlattr *nest;
1233 
1234 	if (n == NULL)
1235 		return skb->len;
1236 
1237 	t->tcm_handle = n->handle;
1238 
1239 	nest = nla_nest_start(skb, TCA_OPTIONS);
1240 	if (nest == NULL)
1241 		goto nla_put_failure;
1242 
1243 	if (TC_U32_KEY(n->handle) == 0) {
1244 		struct tc_u_hnode *ht = fh;
1245 		u32 divisor = ht->divisor + 1;
1246 
1247 		if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1248 			goto nla_put_failure;
1249 	} else {
1250 #ifdef CONFIG_CLS_U32_PERF
1251 		struct tc_u32_pcnt *gpf;
1252 		int cpu;
1253 #endif
1254 
1255 		if (nla_put(skb, TCA_U32_SEL,
1256 			    sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1257 			    &n->sel))
1258 			goto nla_put_failure;
1259 
1260 		ht_up = rtnl_dereference(n->ht_up);
1261 		if (ht_up) {
1262 			u32 htid = n->handle & 0xFFFFF000;
1263 			if (nla_put_u32(skb, TCA_U32_HASH, htid))
1264 				goto nla_put_failure;
1265 		}
1266 		if (n->res.classid &&
1267 		    nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1268 			goto nla_put_failure;
1269 
1270 		ht_down = rtnl_dereference(n->ht_down);
1271 		if (ht_down &&
1272 		    nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1273 			goto nla_put_failure;
1274 
1275 		if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1276 			goto nla_put_failure;
1277 
1278 #ifdef CONFIG_CLS_U32_MARK
1279 		if ((n->val || n->mask)) {
1280 			struct tc_u32_mark mark = {.val = n->val,
1281 						   .mask = n->mask,
1282 						   .success = 0};
1283 			int cpum;
1284 
1285 			for_each_possible_cpu(cpum) {
1286 				__u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1287 
1288 				mark.success += cnt;
1289 			}
1290 
1291 			if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1292 				goto nla_put_failure;
1293 		}
1294 #endif
1295 
1296 		if (tcf_exts_dump(skb, &n->exts) < 0)
1297 			goto nla_put_failure;
1298 
1299 #ifdef CONFIG_NET_CLS_IND
1300 		if (n->ifindex) {
1301 			struct net_device *dev;
1302 			dev = __dev_get_by_index(net, n->ifindex);
1303 			if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1304 				goto nla_put_failure;
1305 		}
1306 #endif
1307 #ifdef CONFIG_CLS_U32_PERF
1308 		gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1309 			      n->sel.nkeys * sizeof(u64),
1310 			      GFP_KERNEL);
1311 		if (!gpf)
1312 			goto nla_put_failure;
1313 
1314 		for_each_possible_cpu(cpu) {
1315 			int i;
1316 			struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1317 
1318 			gpf->rcnt += pf->rcnt;
1319 			gpf->rhit += pf->rhit;
1320 			for (i = 0; i < n->sel.nkeys; i++)
1321 				gpf->kcnts[i] += pf->kcnts[i];
1322 		}
1323 
1324 		if (nla_put_64bit(skb, TCA_U32_PCNT,
1325 				  sizeof(struct tc_u32_pcnt) +
1326 				  n->sel.nkeys * sizeof(u64),
1327 				  gpf, TCA_U32_PAD)) {
1328 			kfree(gpf);
1329 			goto nla_put_failure;
1330 		}
1331 		kfree(gpf);
1332 #endif
1333 	}
1334 
1335 	nla_nest_end(skb, nest);
1336 
1337 	if (TC_U32_KEY(n->handle))
1338 		if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1339 			goto nla_put_failure;
1340 	return skb->len;
1341 
1342 nla_put_failure:
1343 	nla_nest_cancel(skb, nest);
1344 	return -1;
1345 }
1346 
1347 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1348 	.kind		=	"u32",
1349 	.classify	=	u32_classify,
1350 	.init		=	u32_init,
1351 	.destroy	=	u32_destroy,
1352 	.get		=	u32_get,
1353 	.change		=	u32_change,
1354 	.delete		=	u32_delete,
1355 	.walk		=	u32_walk,
1356 	.dump		=	u32_dump,
1357 	.bind_class	=	u32_bind_class,
1358 	.owner		=	THIS_MODULE,
1359 };
1360 
1361 static int __init init_u32(void)
1362 {
1363 	int i, ret;
1364 
1365 	pr_info("u32 classifier\n");
1366 #ifdef CONFIG_CLS_U32_PERF
1367 	pr_info("    Performance counters on\n");
1368 #endif
1369 #ifdef CONFIG_NET_CLS_IND
1370 	pr_info("    input device check on\n");
1371 #endif
1372 #ifdef CONFIG_NET_CLS_ACT
1373 	pr_info("    Actions configured\n");
1374 #endif
1375 	tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1376 					  sizeof(struct hlist_head),
1377 					  GFP_KERNEL);
1378 	if (!tc_u_common_hash)
1379 		return -ENOMEM;
1380 
1381 	for (i = 0; i < U32_HASH_SIZE; i++)
1382 		INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1383 
1384 	ret = register_tcf_proto_ops(&cls_u32_ops);
1385 	if (ret)
1386 		kvfree(tc_u_common_hash);
1387 	return ret;
1388 }
1389 
1390 static void __exit exit_u32(void)
1391 {
1392 	unregister_tcf_proto_ops(&cls_u32_ops);
1393 	kvfree(tc_u_common_hash);
1394 }
1395 
1396 module_init(init_u32)
1397 module_exit(exit_u32)
1398 MODULE_LICENSE("GPL");
1399