]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - net/sched/cls_u32.c
projects / mirror_ubuntu-jammy-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'drm-misc-fixes-2018-11-14' of git://anongit.freedesktop.org/drm/drm-misc...
[mirror_ubuntu-jammy-kernel.git] / net / sched / cls_u32.c
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 unsigned int in_hw_count;
66 #ifdef CONFIG_CLS_U32_MARK
67 u32 val;
68 u32 mask;
69 u32 __percpu *pcpu_success;
70 #endif
71 struct rcu_work rwork;
72 /* The 'sel' field MUST be the last field in structure to allow for
73 * tc_u32_keys allocated at end of structure.
74 */
75 struct tc_u32_sel sel;
76 };
77
78 struct tc_u_hnode {
79 struct tc_u_hnode __rcu *next;
80 u32 handle;
81 u32 prio;
82 int refcnt;
83 unsigned int divisor;
84 struct idr handle_idr;
85 bool is_root;
86 struct rcu_head rcu;
87 u32 flags;
88 /* The 'ht' field MUST be the last field in structure to allow for
89 * more entries allocated at end of structure.
90 */
91 struct tc_u_knode __rcu *ht[1];
92 };
93
94 struct tc_u_common {
95 struct tc_u_hnode __rcu *hlist;
96 void *ptr;
97 int refcnt;
98 struct idr handle_idr;
99 struct hlist_node hnode;
100 long knodes;
101 };
102
103 static inline unsigned int u32_hash_fold(__be32 key,
104 const struct tc_u32_sel *sel,
105 u8 fshift)
106 {
107 unsigned int h = ntohl(key & sel->hmask) >> fshift;
108
109 return h;
110 }
111
112 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
113 struct tcf_result *res)
114 {
115 struct {
116 struct tc_u_knode *knode;
117 unsigned int off;
118 } stack[TC_U32_MAXDEPTH];
119
120 struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
121 unsigned int off = skb_network_offset(skb);
122 struct tc_u_knode *n;
123 int sdepth = 0;
124 int off2 = 0;
125 int sel = 0;
126 #ifdef CONFIG_CLS_U32_PERF
127 int j;
128 #endif
129 int i, r;
130
131 next_ht:
132 n = rcu_dereference_bh(ht->ht[sel]);
133
134 next_knode:
135 if (n) {
136 struct tc_u32_key *key = n->sel.keys;
137
138 #ifdef CONFIG_CLS_U32_PERF
139 __this_cpu_inc(n->pf->rcnt);
140 j = 0;
141 #endif
142
143 if (tc_skip_sw(n->flags)) {
144 n = rcu_dereference_bh(n->next);
145 goto next_knode;
146 }
147
148 #ifdef CONFIG_CLS_U32_MARK
149 if ((skb->mark & n->mask) != n->val) {
150 n = rcu_dereference_bh(n->next);
151 goto next_knode;
152 } else {
153 __this_cpu_inc(*n->pcpu_success);
154 }
155 #endif
156
157 for (i = n->sel.nkeys; i > 0; i--, key++) {
158 int toff = off + key->off + (off2 & key->offmask);
159 __be32 *data, hdata;
160
161 if (skb_headroom(skb) + toff > INT_MAX)
162 goto out;
163
164 data = skb_header_pointer(skb, toff, 4, &hdata);
165 if (!data)
166 goto out;
167 if ((*data ^ key->val) & key->mask) {
168 n = rcu_dereference_bh(n->next);
169 goto next_knode;
170 }
171 #ifdef CONFIG_CLS_U32_PERF
172 __this_cpu_inc(n->pf->kcnts[j]);
173 j++;
174 #endif
175 }
176
177 ht = rcu_dereference_bh(n->ht_down);
178 if (!ht) {
179 check_terminal:
180 if (n->sel.flags & TC_U32_TERMINAL) {
181
182 *res = n->res;
183 #ifdef CONFIG_NET_CLS_IND
184 if (!tcf_match_indev(skb, n->ifindex)) {
185 n = rcu_dereference_bh(n->next);
186 goto next_knode;
187 }
188 #endif
189 #ifdef CONFIG_CLS_U32_PERF
190 __this_cpu_inc(n->pf->rhit);
191 #endif
192 r = tcf_exts_exec(skb, &n->exts, res);
193 if (r < 0) {
194 n = rcu_dereference_bh(n->next);
195 goto next_knode;
196 }
197
198 return r;
199 }
200 n = rcu_dereference_bh(n->next);
201 goto next_knode;
202 }
203
204 /* PUSH */
205 if (sdepth >= TC_U32_MAXDEPTH)
206 goto deadloop;
207 stack[sdepth].knode = n;
208 stack[sdepth].off = off;
209 sdepth++;
210
211 ht = rcu_dereference_bh(n->ht_down);
212 sel = 0;
213 if (ht->divisor) {
214 __be32 *data, hdata;
215
216 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
217 &hdata);
218 if (!data)
219 goto out;
220 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
221 n->fshift);
222 }
223 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
224 goto next_ht;
225
226 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
227 off2 = n->sel.off + 3;
228 if (n->sel.flags & TC_U32_VAROFFSET) {
229 __be16 *data, hdata;
230
231 data = skb_header_pointer(skb,
232 off + n->sel.offoff,
233 2, &hdata);
234 if (!data)
235 goto out;
236 off2 += ntohs(n->sel.offmask & *data) >>
237 n->sel.offshift;
238 }
239 off2 &= ~3;
240 }
241 if (n->sel.flags & TC_U32_EAT) {
242 off += off2;
243 off2 = 0;
244 }
245
246 if (off < skb->len)
247 goto next_ht;
248 }
249
250 /* POP */
251 if (sdepth--) {
252 n = stack[sdepth].knode;
253 ht = rcu_dereference_bh(n->ht_up);
254 off = stack[sdepth].off;
255 goto check_terminal;
256 }
257 out:
258 return -1;
259
260 deadloop:
261 net_warn_ratelimited("cls_u32: dead loop\n");
262 return -1;
263 }
264
265 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
266 {
267 struct tc_u_hnode *ht;
268
269 for (ht = rtnl_dereference(tp_c->hlist);
270 ht;
271 ht = rtnl_dereference(ht->next))
272 if (ht->handle == handle)
273 break;
274
275 return ht;
276 }
277
278 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
279 {
280 unsigned int sel;
281 struct tc_u_knode *n = NULL;
282
283 sel = TC_U32_HASH(handle);
284 if (sel > ht->divisor)
285 goto out;
286
287 for (n = rtnl_dereference(ht->ht[sel]);
288 n;
289 n = rtnl_dereference(n->next))
290 if (n->handle == handle)
291 break;
292 out:
293 return n;
294 }
295
296
297 static void *u32_get(struct tcf_proto *tp, u32 handle)
298 {
299 struct tc_u_hnode *ht;
300 struct tc_u_common *tp_c = tp->data;
301
302 if (TC_U32_HTID(handle) == TC_U32_ROOT)
303 ht = rtnl_dereference(tp->root);
304 else
305 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
306
307 if (!ht)
308 return NULL;
309
310 if (TC_U32_KEY(handle) == 0)
311 return ht;
312
313 return u32_lookup_key(ht, handle);
314 }
315
316 /* Protected by rtnl lock */
317 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
318 {
319 int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
320 if (id < 0)
321 return 0;
322 return (id | 0x800U) << 20;
323 }
324
325 static struct hlist_head *tc_u_common_hash;
326
327 #define U32_HASH_SHIFT 10
328 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
329
330 static void *tc_u_common_ptr(const struct tcf_proto *tp)
331 {
332 struct tcf_block *block = tp->chain->block;
333
334 /* The block sharing is currently supported only
335 * for classless qdiscs. In that case we use block
336 * for tc_u_common identification. In case the
337 * block is not shared, block->q is a valid pointer
338 * and we can use that. That works for classful qdiscs.
339 */
340 if (tcf_block_shared(block))
341 return block;
342 else
343 return block->q;
344 }
345
346 static struct hlist_head *tc_u_hash(void *key)
347 {
348 return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT);
349 }
350
351 static struct tc_u_common *tc_u_common_find(void *key)
352 {
353 struct tc_u_common *tc;
354 hlist_for_each_entry(tc, tc_u_hash(key), hnode) {
355 if (tc->ptr == key)
356 return tc;
357 }
358 return NULL;
359 }
360
361 static int u32_init(struct tcf_proto *tp)
362 {
363 struct tc_u_hnode *root_ht;
364 void *key = tc_u_common_ptr(tp);
365 struct tc_u_common *tp_c = tc_u_common_find(key);
366
367 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
368 if (root_ht == NULL)
369 return -ENOBUFS;
370
371 root_ht->refcnt++;
372 root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
373 root_ht->prio = tp->prio;
374 root_ht->is_root = true;
375 idr_init(&root_ht->handle_idr);
376
377 if (tp_c == NULL) {
378 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
379 if (tp_c == NULL) {
380 kfree(root_ht);
381 return -ENOBUFS;
382 }
383 tp_c->ptr = key;
384 INIT_HLIST_NODE(&tp_c->hnode);
385 idr_init(&tp_c->handle_idr);
386
387 hlist_add_head(&tp_c->hnode, tc_u_hash(key));
388 }
389
390 tp_c->refcnt++;
391 RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
392 rcu_assign_pointer(tp_c->hlist, root_ht);
393
394 root_ht->refcnt++;
395 rcu_assign_pointer(tp->root, root_ht);
396 tp->data = tp_c;
397 return 0;
398 }
399
400 static int u32_destroy_key(struct tc_u_knode *n, bool free_pf)
401 {
402 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
403
404 tcf_exts_destroy(&n->exts);
405 tcf_exts_put_net(&n->exts);
406 if (ht && --ht->refcnt == 0)
407 kfree(ht);
408 #ifdef CONFIG_CLS_U32_PERF
409 if (free_pf)
410 free_percpu(n->pf);
411 #endif
412 #ifdef CONFIG_CLS_U32_MARK
413 if (free_pf)
414 free_percpu(n->pcpu_success);
415 #endif
416 kfree(n);
417 return 0;
418 }
419
420 /* u32_delete_key_rcu should be called when free'ing a copied
421 * version of a tc_u_knode obtained from u32_init_knode(). When
422 * copies are obtained from u32_init_knode() the statistics are
423 * shared between the old and new copies to allow readers to
424 * continue to update the statistics during the copy. To support
425 * this the u32_delete_key_rcu variant does not free the percpu
426 * statistics.
427 */
428 static void u32_delete_key_work(struct work_struct *work)
429 {
430 struct tc_u_knode *key = container_of(to_rcu_work(work),
431 struct tc_u_knode,
432 rwork);
433 rtnl_lock();
434 u32_destroy_key(key, false);
435 rtnl_unlock();
436 }
437
438 /* u32_delete_key_freepf_rcu is the rcu callback variant
439 * that free's the entire structure including the statistics
440 * percpu variables. Only use this if the key is not a copy
441 * returned by u32_init_knode(). See u32_delete_key_rcu()
442 * for the variant that should be used with keys return from
443 * u32_init_knode()
444 */
445 static void u32_delete_key_freepf_work(struct work_struct *work)
446 {
447 struct tc_u_knode *key = container_of(to_rcu_work(work),
448 struct tc_u_knode,
449 rwork);
450 rtnl_lock();
451 u32_destroy_key(key, true);
452 rtnl_unlock();
453 }
454
455 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
456 {
457 struct tc_u_common *tp_c = tp->data;
458 struct tc_u_knode __rcu **kp;
459 struct tc_u_knode *pkp;
460 struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
461
462 if (ht) {
463 kp = &ht->ht[TC_U32_HASH(key->handle)];
464 for (pkp = rtnl_dereference(*kp); pkp;
465 kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
466 if (pkp == key) {
467 RCU_INIT_POINTER(*kp, key->next);
468 tp_c->knodes--;
469
470 tcf_unbind_filter(tp, &key->res);
471 idr_remove(&ht->handle_idr, key->handle);
472 tcf_exts_get_net(&key->exts);
473 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work);
474 return 0;
475 }
476 }
477 }
478 WARN_ON(1);
479 return 0;
480 }
481
482 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
483 struct netlink_ext_ack *extack)
484 {
485 struct tcf_block *block = tp->chain->block;
486 struct tc_cls_u32_offload cls_u32 = {};
487
488 tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
489 cls_u32.command = TC_CLSU32_DELETE_HNODE;
490 cls_u32.hnode.divisor = h->divisor;
491 cls_u32.hnode.handle = h->handle;
492 cls_u32.hnode.prio = h->prio;
493
494 tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
495 }
496
497 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
498 u32 flags, struct netlink_ext_ack *extack)
499 {
500 struct tcf_block *block = tp->chain->block;
501 struct tc_cls_u32_offload cls_u32 = {};
502 bool skip_sw = tc_skip_sw(flags);
503 bool offloaded = false;
504 int err;
505
506 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
507 cls_u32.command = TC_CLSU32_NEW_HNODE;
508 cls_u32.hnode.divisor = h->divisor;
509 cls_u32.hnode.handle = h->handle;
510 cls_u32.hnode.prio = h->prio;
511
512 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
513 if (err < 0) {
514 u32_clear_hw_hnode(tp, h, NULL);
515 return err;
516 } else if (err > 0) {
517 offloaded = true;
518 }
519
520 if (skip_sw && !offloaded)
521 return -EINVAL;
522
523 return 0;
524 }
525
526 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
527 struct netlink_ext_ack *extack)
528 {
529 struct tcf_block *block = tp->chain->block;
530 struct tc_cls_u32_offload cls_u32 = {};
531
532 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
533 cls_u32.command = TC_CLSU32_DELETE_KNODE;
534 cls_u32.knode.handle = n->handle;
535
536 tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
537 tcf_block_offload_dec(block, &n->flags);
538 }
539
540 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
541 u32 flags, struct netlink_ext_ack *extack)
542 {
543 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
544 struct tcf_block *block = tp->chain->block;
545 struct tc_cls_u32_offload cls_u32 = {};
546 bool skip_sw = tc_skip_sw(flags);
547 int err;
548
549 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
550 cls_u32.command = TC_CLSU32_REPLACE_KNODE;
551 cls_u32.knode.handle = n->handle;
552 cls_u32.knode.fshift = n->fshift;
553 #ifdef CONFIG_CLS_U32_MARK
554 cls_u32.knode.val = n->val;
555 cls_u32.knode.mask = n->mask;
556 #else
557 cls_u32.knode.val = 0;
558 cls_u32.knode.mask = 0;
559 #endif
560 cls_u32.knode.sel = &n->sel;
561 cls_u32.knode.exts = &n->exts;
562 if (n->ht_down)
563 cls_u32.knode.link_handle = ht->handle;
564
565 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
566 if (err < 0) {
567 u32_remove_hw_knode(tp, n, NULL);
568 return err;
569 } else if (err > 0) {
570 n->in_hw_count = err;
571 tcf_block_offload_inc(block, &n->flags);
572 }
573
574 if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
575 return -EINVAL;
576
577 return 0;
578 }
579
580 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
581 struct netlink_ext_ack *extack)
582 {
583 struct tc_u_common *tp_c = tp->data;
584 struct tc_u_knode *n;
585 unsigned int h;
586
587 for (h = 0; h <= ht->divisor; h++) {
588 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
589 RCU_INIT_POINTER(ht->ht[h],
590 rtnl_dereference(n->next));
591 tp_c->knodes--;
592 tcf_unbind_filter(tp, &n->res);
593 u32_remove_hw_knode(tp, n, extack);
594 idr_remove(&ht->handle_idr, n->handle);
595 if (tcf_exts_get_net(&n->exts))
596 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work);
597 else
598 u32_destroy_key(n, true);
599 }
600 }
601 }
602
603 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
604 struct netlink_ext_ack *extack)
605 {
606 struct tc_u_common *tp_c = tp->data;
607 struct tc_u_hnode __rcu **hn;
608 struct tc_u_hnode *phn;
609
610 WARN_ON(--ht->refcnt);
611
612 u32_clear_hnode(tp, ht, extack);
613
614 hn = &tp_c->hlist;
615 for (phn = rtnl_dereference(*hn);
616 phn;
617 hn = &phn->next, phn = rtnl_dereference(*hn)) {
618 if (phn == ht) {
619 u32_clear_hw_hnode(tp, ht, extack);
620 idr_destroy(&ht->handle_idr);
621 idr_remove(&tp_c->handle_idr, ht->handle);
622 RCU_INIT_POINTER(*hn, ht->next);
623 kfree_rcu(ht, rcu);
624 return 0;
625 }
626 }
627
628 return -ENOENT;
629 }
630
631 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
632 {
633 struct tc_u_common *tp_c = tp->data;
634 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
635
636 WARN_ON(root_ht == NULL);
637
638 if (root_ht && --root_ht->refcnt == 1)
639 u32_destroy_hnode(tp, root_ht, extack);
640
641 if (--tp_c->refcnt == 0) {
642 struct tc_u_hnode *ht;
643
644 hlist_del(&tp_c->hnode);
645
646 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
647 u32_clear_hnode(tp, ht, extack);
648 RCU_INIT_POINTER(tp_c->hlist, ht->next);
649
650 /* u32_destroy_key() will later free ht for us, if it's
651 * still referenced by some knode
652 */
653 if (--ht->refcnt == 0)
654 kfree_rcu(ht, rcu);
655 }
656
657 idr_destroy(&tp_c->handle_idr);
658 kfree(tp_c);
659 }
660
661 tp->data = NULL;
662 }
663
664 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
665 struct netlink_ext_ack *extack)
666 {
667 struct tc_u_hnode *ht = arg;
668 struct tc_u_common *tp_c = tp->data;
669 int ret = 0;
670
671 if (TC_U32_KEY(ht->handle)) {
672 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
673 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
674 goto out;
675 }
676
677 if (ht->is_root) {
678 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
679 return -EINVAL;
680 }
681
682 if (ht->refcnt == 1) {
683 u32_destroy_hnode(tp, ht, extack);
684 } else {
685 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
686 return -EBUSY;
687 }
688
689 out:
690 *last = tp_c->refcnt == 1 && tp_c->knodes == 0;
691 return ret;
692 }
693
694 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
695 {
696 u32 index = htid | 0x800;
697 u32 max = htid | 0xFFF;
698
699 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
700 index = htid + 1;
701 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
702 GFP_KERNEL))
703 index = max;
704 }
705
706 return index;
707 }
708
709 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
710 [TCA_U32_CLASSID] = { .type = NLA_U32 },
711 [TCA_U32_HASH] = { .type = NLA_U32 },
712 [TCA_U32_LINK] = { .type = NLA_U32 },
713 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
714 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
715 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
716 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
717 [TCA_U32_FLAGS] = { .type = NLA_U32 },
718 };
719
720 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
721 unsigned long base,
722 struct tc_u_knode *n, struct nlattr **tb,
723 struct nlattr *est, bool ovr,
724 struct netlink_ext_ack *extack)
725 {
726 int err;
727
728 err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
729 if (err < 0)
730 return err;
731
732 if (tb[TCA_U32_LINK]) {
733 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
734 struct tc_u_hnode *ht_down = NULL, *ht_old;
735
736 if (TC_U32_KEY(handle)) {
737 NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
738 return -EINVAL;
739 }
740
741 if (handle) {
742 ht_down = u32_lookup_ht(tp->data, handle);
743
744 if (!ht_down) {
745 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
746 return -EINVAL;
747 }
748 if (ht_down->is_root) {
749 NL_SET_ERR_MSG_MOD(extack, "Not linking to root node");
750 return -EINVAL;
751 }
752 ht_down->refcnt++;
753 }
754
755 ht_old = rtnl_dereference(n->ht_down);
756 rcu_assign_pointer(n->ht_down, ht_down);
757
758 if (ht_old)
759 ht_old->refcnt--;
760 }
761 if (tb[TCA_U32_CLASSID]) {
762 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
763 tcf_bind_filter(tp, &n->res, base);
764 }
765
766 #ifdef CONFIG_NET_CLS_IND
767 if (tb[TCA_U32_INDEV]) {
768 int ret;
769 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
770 if (ret < 0)
771 return -EINVAL;
772 n->ifindex = ret;
773 }
774 #endif
775 return 0;
776 }
777
778 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
779 struct tc_u_knode *n)
780 {
781 struct tc_u_knode __rcu **ins;
782 struct tc_u_knode *pins;
783 struct tc_u_hnode *ht;
784
785 if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
786 ht = rtnl_dereference(tp->root);
787 else
788 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
789
790 ins = &ht->ht[TC_U32_HASH(n->handle)];
791
792 /* The node must always exist for it to be replaced if this is not the
793 * case then something went very wrong elsewhere.
794 */
795 for (pins = rtnl_dereference(*ins); ;
796 ins = &pins->next, pins = rtnl_dereference(*ins))
797 if (pins->handle == n->handle)
798 break;
799
800 idr_replace(&ht->handle_idr, n, n->handle);
801 RCU_INIT_POINTER(n->next, pins->next);
802 rcu_assign_pointer(*ins, n);
803 }
804
805 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
806 struct tc_u_knode *n)
807 {
808 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
809 struct tc_u32_sel *s = &n->sel;
810 struct tc_u_knode *new;
811
812 new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
813 GFP_KERNEL);
814
815 if (!new)
816 return NULL;
817
818 RCU_INIT_POINTER(new->next, n->next);
819 new->handle = n->handle;
820 RCU_INIT_POINTER(new->ht_up, n->ht_up);
821
822 #ifdef CONFIG_NET_CLS_IND
823 new->ifindex = n->ifindex;
824 #endif
825 new->fshift = n->fshift;
826 new->res = n->res;
827 new->flags = n->flags;
828 RCU_INIT_POINTER(new->ht_down, ht);
829
830 /* bump reference count as long as we hold pointer to structure */
831 if (ht)
832 ht->refcnt++;
833
834 #ifdef CONFIG_CLS_U32_PERF
835 /* Statistics may be incremented by readers during update
836 * so we must keep them in tact. When the node is later destroyed
837 * a special destroy call must be made to not free the pf memory.
838 */
839 new->pf = n->pf;
840 #endif
841
842 #ifdef CONFIG_CLS_U32_MARK
843 new->val = n->val;
844 new->mask = n->mask;
845 /* Similarly success statistics must be moved as pointers */
846 new->pcpu_success = n->pcpu_success;
847 #endif
848 memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
849
850 if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
851 kfree(new);
852 return NULL;
853 }
854
855 return new;
856 }
857
858 static int u32_change(struct net *net, struct sk_buff *in_skb,
859 struct tcf_proto *tp, unsigned long base, u32 handle,
860 struct nlattr **tca, void **arg, bool ovr,
861 struct netlink_ext_ack *extack)
862 {
863 struct tc_u_common *tp_c = tp->data;
864 struct tc_u_hnode *ht;
865 struct tc_u_knode *n;
866 struct tc_u32_sel *s;
867 struct nlattr *opt = tca[TCA_OPTIONS];
868 struct nlattr *tb[TCA_U32_MAX + 1];
869 u32 htid, flags = 0;
870 size_t sel_size;
871 int err;
872 #ifdef CONFIG_CLS_U32_PERF
873 size_t size;
874 #endif
875
876 if (!opt) {
877 if (handle) {
878 NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
879 return -EINVAL;
880 } else {
881 return 0;
882 }
883 }
884
885 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
886 if (err < 0)
887 return err;
888
889 if (tb[TCA_U32_FLAGS]) {
890 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
891 if (!tc_flags_valid(flags)) {
892 NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
893 return -EINVAL;
894 }
895 }
896
897 n = *arg;
898 if (n) {
899 struct tc_u_knode *new;
900
901 if (TC_U32_KEY(n->handle) == 0) {
902 NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
903 return -EINVAL;
904 }
905
906 if ((n->flags ^ flags) &
907 ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
908 NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
909 return -EINVAL;
910 }
911
912 new = u32_init_knode(tp, n);
913 if (!new)
914 return -ENOMEM;
915
916 err = u32_set_parms(net, tp, base, new, tb,
917 tca[TCA_RATE], ovr, extack);
918
919 if (err) {
920 u32_destroy_key(new, false);
921 return err;
922 }
923
924 err = u32_replace_hw_knode(tp, new, flags, extack);
925 if (err) {
926 u32_destroy_key(new, false);
927 return err;
928 }
929
930 if (!tc_in_hw(new->flags))
931 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
932
933 u32_replace_knode(tp, tp_c, new);
934 tcf_unbind_filter(tp, &n->res);
935 tcf_exts_get_net(&n->exts);
936 tcf_queue_work(&n->rwork, u32_delete_key_work);
937 return 0;
938 }
939
940 if (tb[TCA_U32_DIVISOR]) {
941 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
942
943 if (!is_power_of_2(divisor)) {
944 NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2");
945 return -EINVAL;
946 }
947 if (divisor-- > 0x100) {
948 NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
949 return -EINVAL;
950 }
951 if (TC_U32_KEY(handle)) {
952 NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
953 return -EINVAL;
954 }
955 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
956 if (ht == NULL)
957 return -ENOBUFS;
958 if (handle == 0) {
959 handle = gen_new_htid(tp->data, ht);
960 if (handle == 0) {
961 kfree(ht);
962 return -ENOMEM;
963 }
964 } else {
965 err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
966 handle, GFP_KERNEL);
967 if (err) {
968 kfree(ht);
969 return err;
970 }
971 }
972 ht->refcnt = 1;
973 ht->divisor = divisor;
974 ht->handle = handle;
975 ht->prio = tp->prio;
976 idr_init(&ht->handle_idr);
977 ht->flags = flags;
978
979 err = u32_replace_hw_hnode(tp, ht, flags, extack);
980 if (err) {
981 idr_remove(&tp_c->handle_idr, handle);
982 kfree(ht);
983 return err;
984 }
985
986 RCU_INIT_POINTER(ht->next, tp_c->hlist);
987 rcu_assign_pointer(tp_c->hlist, ht);
988 *arg = ht;
989
990 return 0;
991 }
992
993 if (tb[TCA_U32_HASH]) {
994 htid = nla_get_u32(tb[TCA_U32_HASH]);
995 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
996 ht = rtnl_dereference(tp->root);
997 htid = ht->handle;
998 } else {
999 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1000 if (!ht) {
1001 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1002 return -EINVAL;
1003 }
1004 }
1005 } else {
1006 ht = rtnl_dereference(tp->root);
1007 htid = ht->handle;
1008 }
1009
1010 if (ht->divisor < TC_U32_HASH(htid)) {
1011 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1012 return -EINVAL;
1013 }
1014
1015 if (handle) {
1016 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1017 NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1018 return -EINVAL;
1019 }
1020 handle = htid | TC_U32_NODE(handle);
1021 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1022 GFP_KERNEL);
1023 if (err)
1024 return err;
1025 } else
1026 handle = gen_new_kid(ht, htid);
1027
1028 if (tb[TCA_U32_SEL] == NULL) {
1029 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1030 err = -EINVAL;
1031 goto erridr;
1032 }
1033
1034 s = nla_data(tb[TCA_U32_SEL]);
1035 sel_size = struct_size(s, keys, s->nkeys);
1036 if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
1037 err = -EINVAL;
1038 goto erridr;
1039 }
1040
1041 n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
1042 if (n == NULL) {
1043 err = -ENOBUFS;
1044 goto erridr;
1045 }
1046
1047 #ifdef CONFIG_CLS_U32_PERF
1048 size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1049 n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1050 if (!n->pf) {
1051 err = -ENOBUFS;
1052 goto errfree;
1053 }
1054 #endif
1055
1056 memcpy(&n->sel, s, sel_size);
1057 RCU_INIT_POINTER(n->ht_up, ht);
1058 n->handle = handle;
1059 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1060 n->flags = flags;
1061
1062 err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1063 if (err < 0)
1064 goto errout;
1065
1066 #ifdef CONFIG_CLS_U32_MARK
1067 n->pcpu_success = alloc_percpu(u32);
1068 if (!n->pcpu_success) {
1069 err = -ENOMEM;
1070 goto errout;
1071 }
1072
1073 if (tb[TCA_U32_MARK]) {
1074 struct tc_u32_mark *mark;
1075
1076 mark = nla_data(tb[TCA_U32_MARK]);
1077 n->val = mark->val;
1078 n->mask = mark->mask;
1079 }
1080 #endif
1081
1082 err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE], ovr,
1083 extack);
1084 if (err == 0) {
1085 struct tc_u_knode __rcu **ins;
1086 struct tc_u_knode *pins;
1087
1088 err = u32_replace_hw_knode(tp, n, flags, extack);
1089 if (err)
1090 goto errhw;
1091
1092 if (!tc_in_hw(n->flags))
1093 n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1094
1095 ins = &ht->ht[TC_U32_HASH(handle)];
1096 for (pins = rtnl_dereference(*ins); pins;
1097 ins = &pins->next, pins = rtnl_dereference(*ins))
1098 if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1099 break;
1100
1101 RCU_INIT_POINTER(n->next, pins);
1102 rcu_assign_pointer(*ins, n);
1103 tp_c->knodes++;
1104 *arg = n;
1105 return 0;
1106 }
1107
1108 errhw:
1109 #ifdef CONFIG_CLS_U32_MARK
1110 free_percpu(n->pcpu_success);
1111 #endif
1112
1113 errout:
1114 tcf_exts_destroy(&n->exts);
1115 #ifdef CONFIG_CLS_U32_PERF
1116 errfree:
1117 free_percpu(n->pf);
1118 #endif
1119 kfree(n);
1120 erridr:
1121 idr_remove(&ht->handle_idr, handle);
1122 return err;
1123 }
1124
1125 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1126 {
1127 struct tc_u_common *tp_c = tp->data;
1128 struct tc_u_hnode *ht;
1129 struct tc_u_knode *n;
1130 unsigned int h;
1131
1132 if (arg->stop)
1133 return;
1134
1135 for (ht = rtnl_dereference(tp_c->hlist);
1136 ht;
1137 ht = rtnl_dereference(ht->next)) {
1138 if (ht->prio != tp->prio)
1139 continue;
1140 if (arg->count >= arg->skip) {
1141 if (arg->fn(tp, ht, arg) < 0) {
1142 arg->stop = 1;
1143 return;
1144 }
1145 }
1146 arg->count++;
1147 for (h = 0; h <= ht->divisor; h++) {
1148 for (n = rtnl_dereference(ht->ht[h]);
1149 n;
1150 n = rtnl_dereference(n->next)) {
1151 if (arg->count < arg->skip) {
1152 arg->count++;
1153 continue;
1154 }
1155 if (arg->fn(tp, n, arg) < 0) {
1156 arg->stop = 1;
1157 return;
1158 }
1159 arg->count++;
1160 }
1161 }
1162 }
1163 }
1164
1165 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
1166 bool add, tc_setup_cb_t *cb, void *cb_priv,
1167 struct netlink_ext_ack *extack)
1168 {
1169 struct tc_cls_u32_offload cls_u32 = {};
1170 int err;
1171
1172 tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
1173 cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
1174 cls_u32.hnode.divisor = ht->divisor;
1175 cls_u32.hnode.handle = ht->handle;
1176 cls_u32.hnode.prio = ht->prio;
1177
1178 err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1179 if (err && add && tc_skip_sw(ht->flags))
1180 return err;
1181
1182 return 0;
1183 }
1184
1185 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
1186 bool add, tc_setup_cb_t *cb, void *cb_priv,
1187 struct netlink_ext_ack *extack)
1188 {
1189 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
1190 struct tcf_block *block = tp->chain->block;
1191 struct tc_cls_u32_offload cls_u32 = {};
1192 int err;
1193
1194 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
1195 cls_u32.command = add ?
1196 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
1197 cls_u32.knode.handle = n->handle;
1198
1199 if (add) {
1200 cls_u32.knode.fshift = n->fshift;
1201 #ifdef CONFIG_CLS_U32_MARK
1202 cls_u32.knode.val = n->val;
1203 cls_u32.knode.mask = n->mask;
1204 #else
1205 cls_u32.knode.val = 0;
1206 cls_u32.knode.mask = 0;
1207 #endif
1208 cls_u32.knode.sel = &n->sel;
1209 cls_u32.knode.exts = &n->exts;
1210 if (n->ht_down)
1211 cls_u32.knode.link_handle = ht->handle;
1212 }
1213
1214 err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1215 if (err) {
1216 if (add && tc_skip_sw(n->flags))
1217 return err;
1218 return 0;
1219 }
1220
1221 tc_cls_offload_cnt_update(block, &n->in_hw_count, &n->flags, add);
1222
1223 return 0;
1224 }
1225
1226 static int u32_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
1227 void *cb_priv, struct netlink_ext_ack *extack)
1228 {
1229 struct tc_u_common *tp_c = tp->data;
1230 struct tc_u_hnode *ht;
1231 struct tc_u_knode *n;
1232 unsigned int h;
1233 int err;
1234
1235 for (ht = rtnl_dereference(tp_c->hlist);
1236 ht;
1237 ht = rtnl_dereference(ht->next)) {
1238 if (ht->prio != tp->prio)
1239 continue;
1240
1241 /* When adding filters to a new dev, try to offload the
1242 * hashtable first. When removing, do the filters before the
1243 * hashtable.
1244 */
1245 if (add && !tc_skip_hw(ht->flags)) {
1246 err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
1247 extack);
1248 if (err)
1249 return err;
1250 }
1251
1252 for (h = 0; h <= ht->divisor; h++) {
1253 for (n = rtnl_dereference(ht->ht[h]);
1254 n;
1255 n = rtnl_dereference(n->next)) {
1256 if (tc_skip_hw(n->flags))
1257 continue;
1258
1259 err = u32_reoffload_knode(tp, n, add, cb,
1260 cb_priv, extack);
1261 if (err)
1262 return err;
1263 }
1264 }
1265
1266 if (!add && !tc_skip_hw(ht->flags))
1267 u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
1268 }
1269
1270 return 0;
1271 }
1272
1273 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1274 {
1275 struct tc_u_knode *n = fh;
1276
1277 if (n && n->res.classid == classid)
1278 n->res.class = cl;
1279 }
1280
1281 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1282 struct sk_buff *skb, struct tcmsg *t)
1283 {
1284 struct tc_u_knode *n = fh;
1285 struct tc_u_hnode *ht_up, *ht_down;
1286 struct nlattr *nest;
1287
1288 if (n == NULL)
1289 return skb->len;
1290
1291 t->tcm_handle = n->handle;
1292
1293 nest = nla_nest_start(skb, TCA_OPTIONS);
1294 if (nest == NULL)
1295 goto nla_put_failure;
1296
1297 if (TC_U32_KEY(n->handle) == 0) {
1298 struct tc_u_hnode *ht = fh;
1299 u32 divisor = ht->divisor + 1;
1300
1301 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1302 goto nla_put_failure;
1303 } else {
1304 #ifdef CONFIG_CLS_U32_PERF
1305 struct tc_u32_pcnt *gpf;
1306 int cpu;
1307 #endif
1308
1309 if (nla_put(skb, TCA_U32_SEL,
1310 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1311 &n->sel))
1312 goto nla_put_failure;
1313
1314 ht_up = rtnl_dereference(n->ht_up);
1315 if (ht_up) {
1316 u32 htid = n->handle & 0xFFFFF000;
1317 if (nla_put_u32(skb, TCA_U32_HASH, htid))
1318 goto nla_put_failure;
1319 }
1320 if (n->res.classid &&
1321 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1322 goto nla_put_failure;
1323
1324 ht_down = rtnl_dereference(n->ht_down);
1325 if (ht_down &&
1326 nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1327 goto nla_put_failure;
1328
1329 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1330 goto nla_put_failure;
1331
1332 #ifdef CONFIG_CLS_U32_MARK
1333 if ((n->val || n->mask)) {
1334 struct tc_u32_mark mark = {.val = n->val,
1335 .mask = n->mask,
1336 .success = 0};
1337 int cpum;
1338
1339 for_each_possible_cpu(cpum) {
1340 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1341
1342 mark.success += cnt;
1343 }
1344
1345 if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1346 goto nla_put_failure;
1347 }
1348 #endif
1349
1350 if (tcf_exts_dump(skb, &n->exts) < 0)
1351 goto nla_put_failure;
1352
1353 #ifdef CONFIG_NET_CLS_IND
1354 if (n->ifindex) {
1355 struct net_device *dev;
1356 dev = __dev_get_by_index(net, n->ifindex);
1357 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1358 goto nla_put_failure;
1359 }
1360 #endif
1361 #ifdef CONFIG_CLS_U32_PERF
1362 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1363 n->sel.nkeys * sizeof(u64),
1364 GFP_KERNEL);
1365 if (!gpf)
1366 goto nla_put_failure;
1367
1368 for_each_possible_cpu(cpu) {
1369 int i;
1370 struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1371
1372 gpf->rcnt += pf->rcnt;
1373 gpf->rhit += pf->rhit;
1374 for (i = 0; i < n->sel.nkeys; i++)
1375 gpf->kcnts[i] += pf->kcnts[i];
1376 }
1377
1378 if (nla_put_64bit(skb, TCA_U32_PCNT,
1379 sizeof(struct tc_u32_pcnt) +
1380 n->sel.nkeys * sizeof(u64),
1381 gpf, TCA_U32_PAD)) {
1382 kfree(gpf);
1383 goto nla_put_failure;
1384 }
1385 kfree(gpf);
1386 #endif
1387 }
1388
1389 nla_nest_end(skb, nest);
1390
1391 if (TC_U32_KEY(n->handle))
1392 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1393 goto nla_put_failure;
1394 return skb->len;
1395
1396 nla_put_failure:
1397 nla_nest_cancel(skb, nest);
1398 return -1;
1399 }
1400
1401 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1402 .kind = "u32",
1403 .classify = u32_classify,
1404 .init = u32_init,
1405 .destroy = u32_destroy,
1406 .get = u32_get,
1407 .change = u32_change,
1408 .delete = u32_delete,
1409 .walk = u32_walk,
1410 .reoffload = u32_reoffload,
1411 .dump = u32_dump,
1412 .bind_class = u32_bind_class,
1413 .owner = THIS_MODULE,
1414 };
1415
1416 static int __init init_u32(void)
1417 {
1418 int i, ret;
1419
1420 pr_info("u32 classifier\n");
1421 #ifdef CONFIG_CLS_U32_PERF
1422 pr_info(" Performance counters on\n");
1423 #endif
1424 #ifdef CONFIG_NET_CLS_IND
1425 pr_info(" input device check on\n");
1426 #endif
1427 #ifdef CONFIG_NET_CLS_ACT
1428 pr_info(" Actions configured\n");
1429 #endif
1430 tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1431 sizeof(struct hlist_head),
1432 GFP_KERNEL);
1433 if (!tc_u_common_hash)
1434 return -ENOMEM;
1435
1436 for (i = 0; i < U32_HASH_SIZE; i++)
1437 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1438
1439 ret = register_tcf_proto_ops(&cls_u32_ops);
1440 if (ret)
1441 kvfree(tc_u_common_hash);
1442 return ret;
1443 }
1444
1445 static void __exit exit_u32(void)
1446 {
1447 unregister_tcf_proto_ops(&cls_u32_ops);
1448 kvfree(tc_u_common_hash);
1449 }
1450
1451 module_init(init_u32)
1452 module_exit(exit_u32)
1453 MODULE_LICENSE("GPL");
Ubuntu Jammy Linux kernel mirror