xref: /linux/net/sched/cls_u32.c (revision 95298d63c67673c654c08952672d016212b26054) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * net/sched/cls_u32.c	Ugly (or Universal) 32bit key Packet Classifier.
4  *
5  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6  *
7  *	The filters are packed to hash tables of key nodes
8  *	with a set of 32bit key/mask pairs at every node.
9  *	Nodes reference next level hash tables etc.
10  *
11  *	This scheme is the best universal classifier I managed to
12  *	invent; it is not super-fast, but it is not slow (provided you
13  *	program it correctly), and general enough.  And its relative
14  *	speed grows as the number of rules becomes larger.
15  *
16  *	It seems that it represents the best middle point between
17  *	speed and manageability both by human and by machine.
18  *
19  *	It is especially useful for link sharing combined with QoS;
20  *	pure RSVP doesn't need such a general approach and can use
21  *	much simpler (and faster) schemes, sort of cls_rsvp.c.
22  *
23  *	nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
24  */
25 
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/types.h>
29 #include <linux/kernel.h>
30 #include <linux/string.h>
31 #include <linux/errno.h>
32 #include <linux/percpu.h>
33 #include <linux/rtnetlink.h>
34 #include <linux/skbuff.h>
35 #include <linux/bitmap.h>
36 #include <linux/netdevice.h>
37 #include <linux/hash.h>
38 #include <net/netlink.h>
39 #include <net/act_api.h>
40 #include <net/pkt_cls.h>
41 #include <linux/idr.h>
42 
43 struct tc_u_knode {
44 	struct tc_u_knode __rcu	*next;
45 	u32			handle;
46 	struct tc_u_hnode __rcu	*ht_up;
47 	struct tcf_exts		exts;
48 	int			ifindex;
49 	u8			fshift;
50 	struct tcf_result	res;
51 	struct tc_u_hnode __rcu	*ht_down;
52 #ifdef CONFIG_CLS_U32_PERF
53 	struct tc_u32_pcnt __percpu *pf;
54 #endif
55 	u32			flags;
56 	unsigned int		in_hw_count;
57 #ifdef CONFIG_CLS_U32_MARK
58 	u32			val;
59 	u32			mask;
60 	u32 __percpu		*pcpu_success;
61 #endif
62 	struct rcu_work		rwork;
63 	/* The 'sel' field MUST be the last field in structure to allow for
64 	 * tc_u32_keys allocated at end of structure.
65 	 */
66 	struct tc_u32_sel	sel;
67 };
68 
69 struct tc_u_hnode {
70 	struct tc_u_hnode __rcu	*next;
71 	u32			handle;
72 	u32			prio;
73 	int			refcnt;
74 	unsigned int		divisor;
75 	struct idr		handle_idr;
76 	bool			is_root;
77 	struct rcu_head		rcu;
78 	u32			flags;
79 	/* The 'ht' field MUST be the last field in structure to allow for
80 	 * more entries allocated at end of structure.
81 	 */
82 	struct tc_u_knode __rcu	*ht[1];
83 };
84 
85 struct tc_u_common {
86 	struct tc_u_hnode __rcu	*hlist;
87 	void			*ptr;
88 	int			refcnt;
89 	struct idr		handle_idr;
90 	struct hlist_node	hnode;
91 	long			knodes;
92 };
93 
94 static inline unsigned int u32_hash_fold(__be32 key,
95 					 const struct tc_u32_sel *sel,
96 					 u8 fshift)
97 {
98 	unsigned int h = ntohl(key & sel->hmask) >> fshift;
99 
100 	return h;
101 }
102 
103 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
104 			struct tcf_result *res)
105 {
106 	struct {
107 		struct tc_u_knode *knode;
108 		unsigned int	  off;
109 	} stack[TC_U32_MAXDEPTH];
110 
111 	struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
112 	unsigned int off = skb_network_offset(skb);
113 	struct tc_u_knode *n;
114 	int sdepth = 0;
115 	int off2 = 0;
116 	int sel = 0;
117 #ifdef CONFIG_CLS_U32_PERF
118 	int j;
119 #endif
120 	int i, r;
121 
122 next_ht:
123 	n = rcu_dereference_bh(ht->ht[sel]);
124 
125 next_knode:
126 	if (n) {
127 		struct tc_u32_key *key = n->sel.keys;
128 
129 #ifdef CONFIG_CLS_U32_PERF
130 		__this_cpu_inc(n->pf->rcnt);
131 		j = 0;
132 #endif
133 
134 		if (tc_skip_sw(n->flags)) {
135 			n = rcu_dereference_bh(n->next);
136 			goto next_knode;
137 		}
138 
139 #ifdef CONFIG_CLS_U32_MARK
140 		if ((skb->mark & n->mask) != n->val) {
141 			n = rcu_dereference_bh(n->next);
142 			goto next_knode;
143 		} else {
144 			__this_cpu_inc(*n->pcpu_success);
145 		}
146 #endif
147 
148 		for (i = n->sel.nkeys; i > 0; i--, key++) {
149 			int toff = off + key->off + (off2 & key->offmask);
150 			__be32 *data, hdata;
151 
152 			if (skb_headroom(skb) + toff > INT_MAX)
153 				goto out;
154 
155 			data = skb_header_pointer(skb, toff, 4, &hdata);
156 			if (!data)
157 				goto out;
158 			if ((*data ^ key->val) & key->mask) {
159 				n = rcu_dereference_bh(n->next);
160 				goto next_knode;
161 			}
162 #ifdef CONFIG_CLS_U32_PERF
163 			__this_cpu_inc(n->pf->kcnts[j]);
164 			j++;
165 #endif
166 		}
167 
168 		ht = rcu_dereference_bh(n->ht_down);
169 		if (!ht) {
170 check_terminal:
171 			if (n->sel.flags & TC_U32_TERMINAL) {
172 
173 				*res = n->res;
174 				if (!tcf_match_indev(skb, n->ifindex)) {
175 					n = rcu_dereference_bh(n->next);
176 					goto next_knode;
177 				}
178 #ifdef CONFIG_CLS_U32_PERF
179 				__this_cpu_inc(n->pf->rhit);
180 #endif
181 				r = tcf_exts_exec(skb, &n->exts, res);
182 				if (r < 0) {
183 					n = rcu_dereference_bh(n->next);
184 					goto next_knode;
185 				}
186 
187 				return r;
188 			}
189 			n = rcu_dereference_bh(n->next);
190 			goto next_knode;
191 		}
192 
193 		/* PUSH */
194 		if (sdepth >= TC_U32_MAXDEPTH)
195 			goto deadloop;
196 		stack[sdepth].knode = n;
197 		stack[sdepth].off = off;
198 		sdepth++;
199 
200 		ht = rcu_dereference_bh(n->ht_down);
201 		sel = 0;
202 		if (ht->divisor) {
203 			__be32 *data, hdata;
204 
205 			data = skb_header_pointer(skb, off + n->sel.hoff, 4,
206 						  &hdata);
207 			if (!data)
208 				goto out;
209 			sel = ht->divisor & u32_hash_fold(*data, &n->sel,
210 							  n->fshift);
211 		}
212 		if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
213 			goto next_ht;
214 
215 		if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
216 			off2 = n->sel.off + 3;
217 			if (n->sel.flags & TC_U32_VAROFFSET) {
218 				__be16 *data, hdata;
219 
220 				data = skb_header_pointer(skb,
221 							  off + n->sel.offoff,
222 							  2, &hdata);
223 				if (!data)
224 					goto out;
225 				off2 += ntohs(n->sel.offmask & *data) >>
226 					n->sel.offshift;
227 			}
228 			off2 &= ~3;
229 		}
230 		if (n->sel.flags & TC_U32_EAT) {
231 			off += off2;
232 			off2 = 0;
233 		}
234 
235 		if (off < skb->len)
236 			goto next_ht;
237 	}
238 
239 	/* POP */
240 	if (sdepth--) {
241 		n = stack[sdepth].knode;
242 		ht = rcu_dereference_bh(n->ht_up);
243 		off = stack[sdepth].off;
244 		goto check_terminal;
245 	}
246 out:
247 	return -1;
248 
249 deadloop:
250 	net_warn_ratelimited("cls_u32: dead loop\n");
251 	return -1;
252 }
253 
254 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
255 {
256 	struct tc_u_hnode *ht;
257 
258 	for (ht = rtnl_dereference(tp_c->hlist);
259 	     ht;
260 	     ht = rtnl_dereference(ht->next))
261 		if (ht->handle == handle)
262 			break;
263 
264 	return ht;
265 }
266 
267 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
268 {
269 	unsigned int sel;
270 	struct tc_u_knode *n = NULL;
271 
272 	sel = TC_U32_HASH(handle);
273 	if (sel > ht->divisor)
274 		goto out;
275 
276 	for (n = rtnl_dereference(ht->ht[sel]);
277 	     n;
278 	     n = rtnl_dereference(n->next))
279 		if (n->handle == handle)
280 			break;
281 out:
282 	return n;
283 }
284 
285 
286 static void *u32_get(struct tcf_proto *tp, u32 handle)
287 {
288 	struct tc_u_hnode *ht;
289 	struct tc_u_common *tp_c = tp->data;
290 
291 	if (TC_U32_HTID(handle) == TC_U32_ROOT)
292 		ht = rtnl_dereference(tp->root);
293 	else
294 		ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
295 
296 	if (!ht)
297 		return NULL;
298 
299 	if (TC_U32_KEY(handle) == 0)
300 		return ht;
301 
302 	return u32_lookup_key(ht, handle);
303 }
304 
305 /* Protected by rtnl lock */
306 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
307 {
308 	int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
309 	if (id < 0)
310 		return 0;
311 	return (id | 0x800U) << 20;
312 }
313 
314 static struct hlist_head *tc_u_common_hash;
315 
316 #define U32_HASH_SHIFT 10
317 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
318 
319 static void *tc_u_common_ptr(const struct tcf_proto *tp)
320 {
321 	struct tcf_block *block = tp->chain->block;
322 
323 	/* The block sharing is currently supported only
324 	 * for classless qdiscs. In that case we use block
325 	 * for tc_u_common identification. In case the
326 	 * block is not shared, block->q is a valid pointer
327 	 * and we can use that. That works for classful qdiscs.
328 	 */
329 	if (tcf_block_shared(block))
330 		return block;
331 	else
332 		return block->q;
333 }
334 
335 static struct hlist_head *tc_u_hash(void *key)
336 {
337 	return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT);
338 }
339 
340 static struct tc_u_common *tc_u_common_find(void *key)
341 {
342 	struct tc_u_common *tc;
343 	hlist_for_each_entry(tc, tc_u_hash(key), hnode) {
344 		if (tc->ptr == key)
345 			return tc;
346 	}
347 	return NULL;
348 }
349 
350 static int u32_init(struct tcf_proto *tp)
351 {
352 	struct tc_u_hnode *root_ht;
353 	void *key = tc_u_common_ptr(tp);
354 	struct tc_u_common *tp_c = tc_u_common_find(key);
355 
356 	root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
357 	if (root_ht == NULL)
358 		return -ENOBUFS;
359 
360 	root_ht->refcnt++;
361 	root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
362 	root_ht->prio = tp->prio;
363 	root_ht->is_root = true;
364 	idr_init(&root_ht->handle_idr);
365 
366 	if (tp_c == NULL) {
367 		tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
368 		if (tp_c == NULL) {
369 			kfree(root_ht);
370 			return -ENOBUFS;
371 		}
372 		tp_c->ptr = key;
373 		INIT_HLIST_NODE(&tp_c->hnode);
374 		idr_init(&tp_c->handle_idr);
375 
376 		hlist_add_head(&tp_c->hnode, tc_u_hash(key));
377 	}
378 
379 	tp_c->refcnt++;
380 	RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
381 	rcu_assign_pointer(tp_c->hlist, root_ht);
382 
383 	root_ht->refcnt++;
384 	rcu_assign_pointer(tp->root, root_ht);
385 	tp->data = tp_c;
386 	return 0;
387 }
388 
389 static int u32_destroy_key(struct tc_u_knode *n, bool free_pf)
390 {
391 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
392 
393 	tcf_exts_destroy(&n->exts);
394 	tcf_exts_put_net(&n->exts);
395 	if (ht && --ht->refcnt == 0)
396 		kfree(ht);
397 #ifdef CONFIG_CLS_U32_PERF
398 	if (free_pf)
399 		free_percpu(n->pf);
400 #endif
401 #ifdef CONFIG_CLS_U32_MARK
402 	if (free_pf)
403 		free_percpu(n->pcpu_success);
404 #endif
405 	kfree(n);
406 	return 0;
407 }
408 
409 /* u32_delete_key_rcu should be called when free'ing a copied
410  * version of a tc_u_knode obtained from u32_init_knode(). When
411  * copies are obtained from u32_init_knode() the statistics are
412  * shared between the old and new copies to allow readers to
413  * continue to update the statistics during the copy. To support
414  * this the u32_delete_key_rcu variant does not free the percpu
415  * statistics.
416  */
417 static void u32_delete_key_work(struct work_struct *work)
418 {
419 	struct tc_u_knode *key = container_of(to_rcu_work(work),
420 					      struct tc_u_knode,
421 					      rwork);
422 	rtnl_lock();
423 	u32_destroy_key(key, false);
424 	rtnl_unlock();
425 }
426 
427 /* u32_delete_key_freepf_rcu is the rcu callback variant
428  * that free's the entire structure including the statistics
429  * percpu variables. Only use this if the key is not a copy
430  * returned by u32_init_knode(). See u32_delete_key_rcu()
431  * for the variant that should be used with keys return from
432  * u32_init_knode()
433  */
434 static void u32_delete_key_freepf_work(struct work_struct *work)
435 {
436 	struct tc_u_knode *key = container_of(to_rcu_work(work),
437 					      struct tc_u_knode,
438 					      rwork);
439 	rtnl_lock();
440 	u32_destroy_key(key, true);
441 	rtnl_unlock();
442 }
443 
444 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
445 {
446 	struct tc_u_common *tp_c = tp->data;
447 	struct tc_u_knode __rcu **kp;
448 	struct tc_u_knode *pkp;
449 	struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
450 
451 	if (ht) {
452 		kp = &ht->ht[TC_U32_HASH(key->handle)];
453 		for (pkp = rtnl_dereference(*kp); pkp;
454 		     kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
455 			if (pkp == key) {
456 				RCU_INIT_POINTER(*kp, key->next);
457 				tp_c->knodes--;
458 
459 				tcf_unbind_filter(tp, &key->res);
460 				idr_remove(&ht->handle_idr, key->handle);
461 				tcf_exts_get_net(&key->exts);
462 				tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
463 				return 0;
464 			}
465 		}
466 	}
467 	WARN_ON(1);
468 	return 0;
469 }
470 
471 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
472 			       struct netlink_ext_ack *extack)
473 {
474 	struct tcf_block *block = tp->chain->block;
475 	struct tc_cls_u32_offload cls_u32 = {};
476 
477 	tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
478 	cls_u32.command = TC_CLSU32_DELETE_HNODE;
479 	cls_u32.hnode.divisor = h->divisor;
480 	cls_u32.hnode.handle = h->handle;
481 	cls_u32.hnode.prio = h->prio;
482 
483 	tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, false, true);
484 }
485 
486 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
487 				u32 flags, struct netlink_ext_ack *extack)
488 {
489 	struct tcf_block *block = tp->chain->block;
490 	struct tc_cls_u32_offload cls_u32 = {};
491 	bool skip_sw = tc_skip_sw(flags);
492 	bool offloaded = false;
493 	int err;
494 
495 	tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
496 	cls_u32.command = TC_CLSU32_NEW_HNODE;
497 	cls_u32.hnode.divisor = h->divisor;
498 	cls_u32.hnode.handle = h->handle;
499 	cls_u32.hnode.prio = h->prio;
500 
501 	err = tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, skip_sw, true);
502 	if (err < 0) {
503 		u32_clear_hw_hnode(tp, h, NULL);
504 		return err;
505 	} else if (err > 0) {
506 		offloaded = true;
507 	}
508 
509 	if (skip_sw && !offloaded)
510 		return -EINVAL;
511 
512 	return 0;
513 }
514 
515 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
516 				struct netlink_ext_ack *extack)
517 {
518 	struct tcf_block *block = tp->chain->block;
519 	struct tc_cls_u32_offload cls_u32 = {};
520 
521 	tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
522 	cls_u32.command = TC_CLSU32_DELETE_KNODE;
523 	cls_u32.knode.handle = n->handle;
524 
525 	tc_setup_cb_destroy(block, tp, TC_SETUP_CLSU32, &cls_u32, false,
526 			    &n->flags, &n->in_hw_count, true);
527 }
528 
529 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
530 				u32 flags, struct netlink_ext_ack *extack)
531 {
532 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
533 	struct tcf_block *block = tp->chain->block;
534 	struct tc_cls_u32_offload cls_u32 = {};
535 	bool skip_sw = tc_skip_sw(flags);
536 	int err;
537 
538 	tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
539 	cls_u32.command = TC_CLSU32_REPLACE_KNODE;
540 	cls_u32.knode.handle = n->handle;
541 	cls_u32.knode.fshift = n->fshift;
542 #ifdef CONFIG_CLS_U32_MARK
543 	cls_u32.knode.val = n->val;
544 	cls_u32.knode.mask = n->mask;
545 #else
546 	cls_u32.knode.val = 0;
547 	cls_u32.knode.mask = 0;
548 #endif
549 	cls_u32.knode.sel = &n->sel;
550 	cls_u32.knode.res = &n->res;
551 	cls_u32.knode.exts = &n->exts;
552 	if (n->ht_down)
553 		cls_u32.knode.link_handle = ht->handle;
554 
555 	err = tc_setup_cb_add(block, tp, TC_SETUP_CLSU32, &cls_u32, skip_sw,
556 			      &n->flags, &n->in_hw_count, true);
557 	if (err) {
558 		u32_remove_hw_knode(tp, n, NULL);
559 		return err;
560 	}
561 
562 	if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
563 		return -EINVAL;
564 
565 	return 0;
566 }
567 
568 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
569 			    struct netlink_ext_ack *extack)
570 {
571 	struct tc_u_common *tp_c = tp->data;
572 	struct tc_u_knode *n;
573 	unsigned int h;
574 
575 	for (h = 0; h <= ht->divisor; h++) {
576 		while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
577 			RCU_INIT_POINTER(ht->ht[h],
578 					 rtnl_dereference(n->next));
579 			tp_c->knodes--;
580 			tcf_unbind_filter(tp, &n->res);
581 			u32_remove_hw_knode(tp, n, extack);
582 			idr_remove(&ht->handle_idr, n->handle);
583 			if (tcf_exts_get_net(&n->exts))
584 				tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
585 			else
586 				u32_destroy_key(n, true);
587 		}
588 	}
589 }
590 
591 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
592 			     struct netlink_ext_ack *extack)
593 {
594 	struct tc_u_common *tp_c = tp->data;
595 	struct tc_u_hnode __rcu **hn;
596 	struct tc_u_hnode *phn;
597 
598 	WARN_ON(--ht->refcnt);
599 
600 	u32_clear_hnode(tp, ht, extack);
601 
602 	hn = &tp_c->hlist;
603 	for (phn = rtnl_dereference(*hn);
604 	     phn;
605 	     hn = &phn->next, phn = rtnl_dereference(*hn)) {
606 		if (phn == ht) {
607 			u32_clear_hw_hnode(tp, ht, extack);
608 			idr_destroy(&ht->handle_idr);
609 			idr_remove(&tp_c->handle_idr, ht->handle);
610 			RCU_INIT_POINTER(*hn, ht->next);
611 			kfree_rcu(ht, rcu);
612 			return 0;
613 		}
614 	}
615 
616 	return -ENOENT;
617 }
618 
619 static void u32_destroy(struct tcf_proto *tp, bool rtnl_held,
620 			struct netlink_ext_ack *extack)
621 {
622 	struct tc_u_common *tp_c = tp->data;
623 	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
624 
625 	WARN_ON(root_ht == NULL);
626 
627 	if (root_ht && --root_ht->refcnt == 1)
628 		u32_destroy_hnode(tp, root_ht, extack);
629 
630 	if (--tp_c->refcnt == 0) {
631 		struct tc_u_hnode *ht;
632 
633 		hlist_del(&tp_c->hnode);
634 
635 		while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
636 			u32_clear_hnode(tp, ht, extack);
637 			RCU_INIT_POINTER(tp_c->hlist, ht->next);
638 
639 			/* u32_destroy_key() will later free ht for us, if it's
640 			 * still referenced by some knode
641 			 */
642 			if (--ht->refcnt == 0)
643 				kfree_rcu(ht, rcu);
644 		}
645 
646 		idr_destroy(&tp_c->handle_idr);
647 		kfree(tp_c);
648 	}
649 
650 	tp->data = NULL;
651 }
652 
653 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
654 		      bool rtnl_held, struct netlink_ext_ack *extack)
655 {
656 	struct tc_u_hnode *ht = arg;
657 	struct tc_u_common *tp_c = tp->data;
658 	int ret = 0;
659 
660 	if (TC_U32_KEY(ht->handle)) {
661 		u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
662 		ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
663 		goto out;
664 	}
665 
666 	if (ht->is_root) {
667 		NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
668 		return -EINVAL;
669 	}
670 
671 	if (ht->refcnt == 1) {
672 		u32_destroy_hnode(tp, ht, extack);
673 	} else {
674 		NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
675 		return -EBUSY;
676 	}
677 
678 out:
679 	*last = tp_c->refcnt == 1 && tp_c->knodes == 0;
680 	return ret;
681 }
682 
683 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
684 {
685 	u32 index = htid | 0x800;
686 	u32 max = htid | 0xFFF;
687 
688 	if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
689 		index = htid + 1;
690 		if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
691 				 GFP_KERNEL))
692 			index = max;
693 	}
694 
695 	return index;
696 }
697 
698 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
699 	[TCA_U32_CLASSID]	= { .type = NLA_U32 },
700 	[TCA_U32_HASH]		= { .type = NLA_U32 },
701 	[TCA_U32_LINK]		= { .type = NLA_U32 },
702 	[TCA_U32_DIVISOR]	= { .type = NLA_U32 },
703 	[TCA_U32_SEL]		= { .len = sizeof(struct tc_u32_sel) },
704 	[TCA_U32_INDEV]		= { .type = NLA_STRING, .len = IFNAMSIZ },
705 	[TCA_U32_MARK]		= { .len = sizeof(struct tc_u32_mark) },
706 	[TCA_U32_FLAGS]		= { .type = NLA_U32 },
707 };
708 
709 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
710 			 unsigned long base,
711 			 struct tc_u_knode *n, struct nlattr **tb,
712 			 struct nlattr *est, bool ovr,
713 			 struct netlink_ext_ack *extack)
714 {
715 	int err;
716 
717 	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, true, extack);
718 	if (err < 0)
719 		return err;
720 
721 	if (tb[TCA_U32_LINK]) {
722 		u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
723 		struct tc_u_hnode *ht_down = NULL, *ht_old;
724 
725 		if (TC_U32_KEY(handle)) {
726 			NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
727 			return -EINVAL;
728 		}
729 
730 		if (handle) {
731 			ht_down = u32_lookup_ht(tp->data, handle);
732 
733 			if (!ht_down) {
734 				NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
735 				return -EINVAL;
736 			}
737 			if (ht_down->is_root) {
738 				NL_SET_ERR_MSG_MOD(extack, "Not linking to root node");
739 				return -EINVAL;
740 			}
741 			ht_down->refcnt++;
742 		}
743 
744 		ht_old = rtnl_dereference(n->ht_down);
745 		rcu_assign_pointer(n->ht_down, ht_down);
746 
747 		if (ht_old)
748 			ht_old->refcnt--;
749 	}
750 	if (tb[TCA_U32_CLASSID]) {
751 		n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
752 		tcf_bind_filter(tp, &n->res, base);
753 	}
754 
755 	if (tb[TCA_U32_INDEV]) {
756 		int ret;
757 		ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
758 		if (ret < 0)
759 			return -EINVAL;
760 		n->ifindex = ret;
761 	}
762 	return 0;
763 }
764 
765 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
766 			      struct tc_u_knode *n)
767 {
768 	struct tc_u_knode __rcu **ins;
769 	struct tc_u_knode *pins;
770 	struct tc_u_hnode *ht;
771 
772 	if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
773 		ht = rtnl_dereference(tp->root);
774 	else
775 		ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
776 
777 	ins = &ht->ht[TC_U32_HASH(n->handle)];
778 
779 	/* The node must always exist for it to be replaced if this is not the
780 	 * case then something went very wrong elsewhere.
781 	 */
782 	for (pins = rtnl_dereference(*ins); ;
783 	     ins = &pins->next, pins = rtnl_dereference(*ins))
784 		if (pins->handle == n->handle)
785 			break;
786 
787 	idr_replace(&ht->handle_idr, n, n->handle);
788 	RCU_INIT_POINTER(n->next, pins->next);
789 	rcu_assign_pointer(*ins, n);
790 }
791 
792 static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp,
793 					 struct tc_u_knode *n)
794 {
795 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
796 	struct tc_u32_sel *s = &n->sel;
797 	struct tc_u_knode *new;
798 
799 	new = kzalloc(struct_size(new, sel.keys, s->nkeys), GFP_KERNEL);
800 	if (!new)
801 		return NULL;
802 
803 	RCU_INIT_POINTER(new->next, n->next);
804 	new->handle = n->handle;
805 	RCU_INIT_POINTER(new->ht_up, n->ht_up);
806 
807 	new->ifindex = n->ifindex;
808 	new->fshift = n->fshift;
809 	new->res = n->res;
810 	new->flags = n->flags;
811 	RCU_INIT_POINTER(new->ht_down, ht);
812 
813 	/* bump reference count as long as we hold pointer to structure */
814 	if (ht)
815 		ht->refcnt++;
816 
817 #ifdef CONFIG_CLS_U32_PERF
818 	/* Statistics may be incremented by readers during update
819 	 * so we must keep them in tact. When the node is later destroyed
820 	 * a special destroy call must be made to not free the pf memory.
821 	 */
822 	new->pf = n->pf;
823 #endif
824 
825 #ifdef CONFIG_CLS_U32_MARK
826 	new->val = n->val;
827 	new->mask = n->mask;
828 	/* Similarly success statistics must be moved as pointers */
829 	new->pcpu_success = n->pcpu_success;
830 #endif
831 	memcpy(&new->sel, s, struct_size(s, keys, s->nkeys));
832 
833 	if (tcf_exts_init(&new->exts, net, TCA_U32_ACT, TCA_U32_POLICE)) {
834 		kfree(new);
835 		return NULL;
836 	}
837 
838 	return new;
839 }
840 
841 static int u32_change(struct net *net, struct sk_buff *in_skb,
842 		      struct tcf_proto *tp, unsigned long base, u32 handle,
843 		      struct nlattr **tca, void **arg, bool ovr, bool rtnl_held,
844 		      struct netlink_ext_ack *extack)
845 {
846 	struct tc_u_common *tp_c = tp->data;
847 	struct tc_u_hnode *ht;
848 	struct tc_u_knode *n;
849 	struct tc_u32_sel *s;
850 	struct nlattr *opt = tca[TCA_OPTIONS];
851 	struct nlattr *tb[TCA_U32_MAX + 1];
852 	u32 htid, flags = 0;
853 	size_t sel_size;
854 	int err;
855 #ifdef CONFIG_CLS_U32_PERF
856 	size_t size;
857 #endif
858 
859 	if (!opt) {
860 		if (handle) {
861 			NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
862 			return -EINVAL;
863 		} else {
864 			return 0;
865 		}
866 	}
867 
868 	err = nla_parse_nested_deprecated(tb, TCA_U32_MAX, opt, u32_policy,
869 					  extack);
870 	if (err < 0)
871 		return err;
872 
873 	if (tb[TCA_U32_FLAGS]) {
874 		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
875 		if (!tc_flags_valid(flags)) {
876 			NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
877 			return -EINVAL;
878 		}
879 	}
880 
881 	n = *arg;
882 	if (n) {
883 		struct tc_u_knode *new;
884 
885 		if (TC_U32_KEY(n->handle) == 0) {
886 			NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
887 			return -EINVAL;
888 		}
889 
890 		if ((n->flags ^ flags) &
891 		    ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
892 			NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
893 			return -EINVAL;
894 		}
895 
896 		new = u32_init_knode(net, tp, n);
897 		if (!new)
898 			return -ENOMEM;
899 
900 		err = u32_set_parms(net, tp, base, new, tb,
901 				    tca[TCA_RATE], ovr, extack);
902 
903 		if (err) {
904 			u32_destroy_key(new, false);
905 			return err;
906 		}
907 
908 		err = u32_replace_hw_knode(tp, new, flags, extack);
909 		if (err) {
910 			u32_destroy_key(new, false);
911 			return err;
912 		}
913 
914 		if (!tc_in_hw(new->flags))
915 			new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
916 
917 		u32_replace_knode(tp, tp_c, new);
918 		tcf_unbind_filter(tp, &n->res);
919 		tcf_exts_get_net(&n->exts);
920 		tcf_queue_work(&n->rwork, u32_delete_key_work);
921 		return 0;
922 	}
923 
924 	if (tb[TCA_U32_DIVISOR]) {
925 		unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
926 
927 		if (!is_power_of_2(divisor)) {
928 			NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2");
929 			return -EINVAL;
930 		}
931 		if (divisor-- > 0x100) {
932 			NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
933 			return -EINVAL;
934 		}
935 		if (TC_U32_KEY(handle)) {
936 			NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
937 			return -EINVAL;
938 		}
939 		ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
940 		if (ht == NULL)
941 			return -ENOBUFS;
942 		if (handle == 0) {
943 			handle = gen_new_htid(tp->data, ht);
944 			if (handle == 0) {
945 				kfree(ht);
946 				return -ENOMEM;
947 			}
948 		} else {
949 			err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
950 					    handle, GFP_KERNEL);
951 			if (err) {
952 				kfree(ht);
953 				return err;
954 			}
955 		}
956 		ht->refcnt = 1;
957 		ht->divisor = divisor;
958 		ht->handle = handle;
959 		ht->prio = tp->prio;
960 		idr_init(&ht->handle_idr);
961 		ht->flags = flags;
962 
963 		err = u32_replace_hw_hnode(tp, ht, flags, extack);
964 		if (err) {
965 			idr_remove(&tp_c->handle_idr, handle);
966 			kfree(ht);
967 			return err;
968 		}
969 
970 		RCU_INIT_POINTER(ht->next, tp_c->hlist);
971 		rcu_assign_pointer(tp_c->hlist, ht);
972 		*arg = ht;
973 
974 		return 0;
975 	}
976 
977 	if (tb[TCA_U32_HASH]) {
978 		htid = nla_get_u32(tb[TCA_U32_HASH]);
979 		if (TC_U32_HTID(htid) == TC_U32_ROOT) {
980 			ht = rtnl_dereference(tp->root);
981 			htid = ht->handle;
982 		} else {
983 			ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
984 			if (!ht) {
985 				NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
986 				return -EINVAL;
987 			}
988 		}
989 	} else {
990 		ht = rtnl_dereference(tp->root);
991 		htid = ht->handle;
992 	}
993 
994 	if (ht->divisor < TC_U32_HASH(htid)) {
995 		NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
996 		return -EINVAL;
997 	}
998 
999 	if (handle) {
1000 		if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1001 			NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1002 			return -EINVAL;
1003 		}
1004 		handle = htid | TC_U32_NODE(handle);
1005 		err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1006 				    GFP_KERNEL);
1007 		if (err)
1008 			return err;
1009 	} else
1010 		handle = gen_new_kid(ht, htid);
1011 
1012 	if (tb[TCA_U32_SEL] == NULL) {
1013 		NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1014 		err = -EINVAL;
1015 		goto erridr;
1016 	}
1017 
1018 	s = nla_data(tb[TCA_U32_SEL]);
1019 	sel_size = struct_size(s, keys, s->nkeys);
1020 	if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
1021 		err = -EINVAL;
1022 		goto erridr;
1023 	}
1024 
1025 	n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
1026 	if (n == NULL) {
1027 		err = -ENOBUFS;
1028 		goto erridr;
1029 	}
1030 
1031 #ifdef CONFIG_CLS_U32_PERF
1032 	size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1033 	n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1034 	if (!n->pf) {
1035 		err = -ENOBUFS;
1036 		goto errfree;
1037 	}
1038 #endif
1039 
1040 	memcpy(&n->sel, s, sel_size);
1041 	RCU_INIT_POINTER(n->ht_up, ht);
1042 	n->handle = handle;
1043 	n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1044 	n->flags = flags;
1045 
1046 	err = tcf_exts_init(&n->exts, net, TCA_U32_ACT, TCA_U32_POLICE);
1047 	if (err < 0)
1048 		goto errout;
1049 
1050 #ifdef CONFIG_CLS_U32_MARK
1051 	n->pcpu_success = alloc_percpu(u32);
1052 	if (!n->pcpu_success) {
1053 		err = -ENOMEM;
1054 		goto errout;
1055 	}
1056 
1057 	if (tb[TCA_U32_MARK]) {
1058 		struct tc_u32_mark *mark;
1059 
1060 		mark = nla_data(tb[TCA_U32_MARK]);
1061 		n->val = mark->val;
1062 		n->mask = mark->mask;
1063 	}
1064 #endif
1065 
1066 	err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE], ovr,
1067 			    extack);
1068 	if (err == 0) {
1069 		struct tc_u_knode __rcu **ins;
1070 		struct tc_u_knode *pins;
1071 
1072 		err = u32_replace_hw_knode(tp, n, flags, extack);
1073 		if (err)
1074 			goto errhw;
1075 
1076 		if (!tc_in_hw(n->flags))
1077 			n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1078 
1079 		ins = &ht->ht[TC_U32_HASH(handle)];
1080 		for (pins = rtnl_dereference(*ins); pins;
1081 		     ins = &pins->next, pins = rtnl_dereference(*ins))
1082 			if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1083 				break;
1084 
1085 		RCU_INIT_POINTER(n->next, pins);
1086 		rcu_assign_pointer(*ins, n);
1087 		tp_c->knodes++;
1088 		*arg = n;
1089 		return 0;
1090 	}
1091 
1092 errhw:
1093 #ifdef CONFIG_CLS_U32_MARK
1094 	free_percpu(n->pcpu_success);
1095 #endif
1096 
1097 errout:
1098 	tcf_exts_destroy(&n->exts);
1099 #ifdef CONFIG_CLS_U32_PERF
1100 errfree:
1101 	free_percpu(n->pf);
1102 #endif
1103 	kfree(n);
1104 erridr:
1105 	idr_remove(&ht->handle_idr, handle);
1106 	return err;
1107 }
1108 
1109 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg,
1110 		     bool rtnl_held)
1111 {
1112 	struct tc_u_common *tp_c = tp->data;
1113 	struct tc_u_hnode *ht;
1114 	struct tc_u_knode *n;
1115 	unsigned int h;
1116 
1117 	if (arg->stop)
1118 		return;
1119 
1120 	for (ht = rtnl_dereference(tp_c->hlist);
1121 	     ht;
1122 	     ht = rtnl_dereference(ht->next)) {
1123 		if (ht->prio != tp->prio)
1124 			continue;
1125 		if (arg->count >= arg->skip) {
1126 			if (arg->fn(tp, ht, arg) < 0) {
1127 				arg->stop = 1;
1128 				return;
1129 			}
1130 		}
1131 		arg->count++;
1132 		for (h = 0; h <= ht->divisor; h++) {
1133 			for (n = rtnl_dereference(ht->ht[h]);
1134 			     n;
1135 			     n = rtnl_dereference(n->next)) {
1136 				if (arg->count < arg->skip) {
1137 					arg->count++;
1138 					continue;
1139 				}
1140 				if (arg->fn(tp, n, arg) < 0) {
1141 					arg->stop = 1;
1142 					return;
1143 				}
1144 				arg->count++;
1145 			}
1146 		}
1147 	}
1148 }
1149 
1150 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
1151 			       bool add, flow_setup_cb_t *cb, void *cb_priv,
1152 			       struct netlink_ext_ack *extack)
1153 {
1154 	struct tc_cls_u32_offload cls_u32 = {};
1155 	int err;
1156 
1157 	tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
1158 	cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
1159 	cls_u32.hnode.divisor = ht->divisor;
1160 	cls_u32.hnode.handle = ht->handle;
1161 	cls_u32.hnode.prio = ht->prio;
1162 
1163 	err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1164 	if (err && add && tc_skip_sw(ht->flags))
1165 		return err;
1166 
1167 	return 0;
1168 }
1169 
1170 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
1171 			       bool add, flow_setup_cb_t *cb, void *cb_priv,
1172 			       struct netlink_ext_ack *extack)
1173 {
1174 	struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
1175 	struct tcf_block *block = tp->chain->block;
1176 	struct tc_cls_u32_offload cls_u32 = {};
1177 	int err;
1178 
1179 	tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
1180 	cls_u32.command = add ?
1181 		TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
1182 	cls_u32.knode.handle = n->handle;
1183 
1184 	if (add) {
1185 		cls_u32.knode.fshift = n->fshift;
1186 #ifdef CONFIG_CLS_U32_MARK
1187 		cls_u32.knode.val = n->val;
1188 		cls_u32.knode.mask = n->mask;
1189 #else
1190 		cls_u32.knode.val = 0;
1191 		cls_u32.knode.mask = 0;
1192 #endif
1193 		cls_u32.knode.sel = &n->sel;
1194 		cls_u32.knode.res = &n->res;
1195 		cls_u32.knode.exts = &n->exts;
1196 		if (n->ht_down)
1197 			cls_u32.knode.link_handle = ht->handle;
1198 	}
1199 
1200 	err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSU32,
1201 				    &cls_u32, cb_priv, &n->flags,
1202 				    &n->in_hw_count);
1203 	if (err)
1204 		return err;
1205 
1206 	return 0;
1207 }
1208 
1209 static int u32_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
1210 			 void *cb_priv, struct netlink_ext_ack *extack)
1211 {
1212 	struct tc_u_common *tp_c = tp->data;
1213 	struct tc_u_hnode *ht;
1214 	struct tc_u_knode *n;
1215 	unsigned int h;
1216 	int err;
1217 
1218 	for (ht = rtnl_dereference(tp_c->hlist);
1219 	     ht;
1220 	     ht = rtnl_dereference(ht->next)) {
1221 		if (ht->prio != tp->prio)
1222 			continue;
1223 
1224 		/* When adding filters to a new dev, try to offload the
1225 		 * hashtable first. When removing, do the filters before the
1226 		 * hashtable.
1227 		 */
1228 		if (add && !tc_skip_hw(ht->flags)) {
1229 			err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
1230 						  extack);
1231 			if (err)
1232 				return err;
1233 		}
1234 
1235 		for (h = 0; h <= ht->divisor; h++) {
1236 			for (n = rtnl_dereference(ht->ht[h]);
1237 			     n;
1238 			     n = rtnl_dereference(n->next)) {
1239 				if (tc_skip_hw(n->flags))
1240 					continue;
1241 
1242 				err = u32_reoffload_knode(tp, n, add, cb,
1243 							  cb_priv, extack);
1244 				if (err)
1245 					return err;
1246 			}
1247 		}
1248 
1249 		if (!add && !tc_skip_hw(ht->flags))
1250 			u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
1251 	}
1252 
1253 	return 0;
1254 }
1255 
1256 static void u32_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
1257 			   unsigned long base)
1258 {
1259 	struct tc_u_knode *n = fh;
1260 
1261 	if (n && n->res.classid == classid) {
1262 		if (cl)
1263 			__tcf_bind_filter(q, &n->res, base);
1264 		else
1265 			__tcf_unbind_filter(q, &n->res);
1266 	}
1267 }
1268 
1269 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1270 		    struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
1271 {
1272 	struct tc_u_knode *n = fh;
1273 	struct tc_u_hnode *ht_up, *ht_down;
1274 	struct nlattr *nest;
1275 
1276 	if (n == NULL)
1277 		return skb->len;
1278 
1279 	t->tcm_handle = n->handle;
1280 
1281 	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1282 	if (nest == NULL)
1283 		goto nla_put_failure;
1284 
1285 	if (TC_U32_KEY(n->handle) == 0) {
1286 		struct tc_u_hnode *ht = fh;
1287 		u32 divisor = ht->divisor + 1;
1288 
1289 		if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1290 			goto nla_put_failure;
1291 	} else {
1292 #ifdef CONFIG_CLS_U32_PERF
1293 		struct tc_u32_pcnt *gpf;
1294 		int cpu;
1295 #endif
1296 
1297 		if (nla_put(skb, TCA_U32_SEL,
1298 			    sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1299 			    &n->sel))
1300 			goto nla_put_failure;
1301 
1302 		ht_up = rtnl_dereference(n->ht_up);
1303 		if (ht_up) {
1304 			u32 htid = n->handle & 0xFFFFF000;
1305 			if (nla_put_u32(skb, TCA_U32_HASH, htid))
1306 				goto nla_put_failure;
1307 		}
1308 		if (n->res.classid &&
1309 		    nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1310 			goto nla_put_failure;
1311 
1312 		ht_down = rtnl_dereference(n->ht_down);
1313 		if (ht_down &&
1314 		    nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1315 			goto nla_put_failure;
1316 
1317 		if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1318 			goto nla_put_failure;
1319 
1320 #ifdef CONFIG_CLS_U32_MARK
1321 		if ((n->val || n->mask)) {
1322 			struct tc_u32_mark mark = {.val = n->val,
1323 						   .mask = n->mask,
1324 						   .success = 0};
1325 			int cpum;
1326 
1327 			for_each_possible_cpu(cpum) {
1328 				__u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1329 
1330 				mark.success += cnt;
1331 			}
1332 
1333 			if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1334 				goto nla_put_failure;
1335 		}
1336 #endif
1337 
1338 		if (tcf_exts_dump(skb, &n->exts) < 0)
1339 			goto nla_put_failure;
1340 
1341 		if (n->ifindex) {
1342 			struct net_device *dev;
1343 			dev = __dev_get_by_index(net, n->ifindex);
1344 			if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1345 				goto nla_put_failure;
1346 		}
1347 #ifdef CONFIG_CLS_U32_PERF
1348 		gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1349 			      n->sel.nkeys * sizeof(u64),
1350 			      GFP_KERNEL);
1351 		if (!gpf)
1352 			goto nla_put_failure;
1353 
1354 		for_each_possible_cpu(cpu) {
1355 			int i;
1356 			struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1357 
1358 			gpf->rcnt += pf->rcnt;
1359 			gpf->rhit += pf->rhit;
1360 			for (i = 0; i < n->sel.nkeys; i++)
1361 				gpf->kcnts[i] += pf->kcnts[i];
1362 		}
1363 
1364 		if (nla_put_64bit(skb, TCA_U32_PCNT,
1365 				  sizeof(struct tc_u32_pcnt) +
1366 				  n->sel.nkeys * sizeof(u64),
1367 				  gpf, TCA_U32_PAD)) {
1368 			kfree(gpf);
1369 			goto nla_put_failure;
1370 		}
1371 		kfree(gpf);
1372 #endif
1373 	}
1374 
1375 	nla_nest_end(skb, nest);
1376 
1377 	if (TC_U32_KEY(n->handle))
1378 		if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1379 			goto nla_put_failure;
1380 	return skb->len;
1381 
1382 nla_put_failure:
1383 	nla_nest_cancel(skb, nest);
1384 	return -1;
1385 }
1386 
1387 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1388 	.kind		=	"u32",
1389 	.classify	=	u32_classify,
1390 	.init		=	u32_init,
1391 	.destroy	=	u32_destroy,
1392 	.get		=	u32_get,
1393 	.change		=	u32_change,
1394 	.delete		=	u32_delete,
1395 	.walk		=	u32_walk,
1396 	.reoffload	=	u32_reoffload,
1397 	.dump		=	u32_dump,
1398 	.bind_class	=	u32_bind_class,
1399 	.owner		=	THIS_MODULE,
1400 };
1401 
1402 static int __init init_u32(void)
1403 {
1404 	int i, ret;
1405 
1406 	pr_info("u32 classifier\n");
1407 #ifdef CONFIG_CLS_U32_PERF
1408 	pr_info("    Performance counters on\n");
1409 #endif
1410 	pr_info("    input device check on\n");
1411 #ifdef CONFIG_NET_CLS_ACT
1412 	pr_info("    Actions configured\n");
1413 #endif
1414 	tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1415 					  sizeof(struct hlist_head),
1416 					  GFP_KERNEL);
1417 	if (!tc_u_common_hash)
1418 		return -ENOMEM;
1419 
1420 	for (i = 0; i < U32_HASH_SIZE; i++)
1421 		INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1422 
1423 	ret = register_tcf_proto_ops(&cls_u32_ops);
1424 	if (ret)
1425 		kvfree(tc_u_common_hash);
1426 	return ret;
1427 }
1428 
1429 static void __exit exit_u32(void)
1430 {
1431 	unregister_tcf_proto_ops(&cls_u32_ops);
1432 	kvfree(tc_u_common_hash);
1433 }
1434 
1435 module_init(init_u32)
1436 module_exit(exit_u32)
1437 MODULE_LICENSE("GPL");
1438