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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
43struct 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
64
65
66 struct tc_u32_sel sel;
67};
68
69struct 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
80
81
82 struct tc_u_knode __rcu *ht[];
83};
84
85struct 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
94static 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
103static 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
122next_ht:
123 n = rcu_dereference_bh(ht->ht[sel]);
124
125next_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) {
170check_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
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
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 }
246out:
247 return -1;
248
249deadloop:
250 net_warn_ratelimited("cls_u32: dead loop\n");
251 return -1;
252}
253
254static 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
267static 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;
281out:
282 return n;
283}
284
285
286static 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
306static 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
314static struct hlist_head *tc_u_common_hash;
315
316#define U32_HASH_SHIFT 10
317#define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
318
319static void *tc_u_common_ptr(const struct tcf_proto *tp)
320{
321 struct tcf_block *block = tp->chain->block;
322
323
324
325
326
327
328
329 if (tcf_block_shared(block))
330 return block;
331 else
332 return block->q;
333}
334
335static struct hlist_head *tc_u_hash(void *key)
336{
337 return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT);
338}
339
340static 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
350static 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(struct_size(root_ht, ht, 1), 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(struct_size(tp_c, hlist->ht, 1), 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
389static 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
410
411
412
413
414
415
416
417static 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
428
429
430
431
432
433
434static 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
444static 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
471static 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
486static 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
515static 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
529static 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
568static 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
591static 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
619static 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
640
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
653static 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
678out:
679 *last = tp_c->refcnt == 1 && tp_c->knodes == 0;
680 return ret;
681}
682
683static 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
698static 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
709static 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, u32 flags,
713 struct netlink_ext_ack *extack)
714{
715 int err;
716
717 err = tcf_exts_validate(net, tp, tb, est, &n->exts, flags, 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
765static 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
780
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
792static 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
814 if (ht)
815 ht->refcnt++;
816
817#ifdef CONFIG_CLS_U32_PERF
818
819
820
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
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
841static 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, u32 flags,
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, userflags = 0;
853 size_t sel_size;
854 int err;
855
856 if (!opt) {
857 if (handle) {
858 NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
859 return -EINVAL;
860 } else {
861 return 0;
862 }
863 }
864
865 err = nla_parse_nested_deprecated(tb, TCA_U32_MAX, opt, u32_policy,
866 extack);
867 if (err < 0)
868 return err;
869
870 if (tb[TCA_U32_FLAGS]) {
871 userflags = nla_get_u32(tb[TCA_U32_FLAGS]);
872 if (!tc_flags_valid(userflags)) {
873 NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
874 return -EINVAL;
875 }
876 }
877
878 n = *arg;
879 if (n) {
880 struct tc_u_knode *new;
881
882 if (TC_U32_KEY(n->handle) == 0) {
883 NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
884 return -EINVAL;
885 }
886
887 if ((n->flags ^ userflags) &
888 ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
889 NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
890 return -EINVAL;
891 }
892
893 new = u32_init_knode(net, tp, n);
894 if (!new)
895 return -ENOMEM;
896
897 err = u32_set_parms(net, tp, base, new, tb,
898 tca[TCA_RATE], flags, extack);
899
900 if (err) {
901 u32_destroy_key(new, false);
902 return err;
903 }
904
905 err = u32_replace_hw_knode(tp, new, flags, extack);
906 if (err) {
907 u32_destroy_key(new, false);
908 return err;
909 }
910
911 if (!tc_in_hw(new->flags))
912 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
913
914 u32_replace_knode(tp, tp_c, new);
915 tcf_unbind_filter(tp, &n->res);
916 tcf_exts_get_net(&n->exts);
917 tcf_queue_work(&n->rwork, u32_delete_key_work);
918 return 0;
919 }
920
921 if (tb[TCA_U32_DIVISOR]) {
922 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
923
924 if (!is_power_of_2(divisor)) {
925 NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2");
926 return -EINVAL;
927 }
928 if (divisor-- > 0x100) {
929 NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
930 return -EINVAL;
931 }
932 if (TC_U32_KEY(handle)) {
933 NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
934 return -EINVAL;
935 }
936 ht = kzalloc(struct_size(ht, ht, divisor + 1), GFP_KERNEL);
937 if (ht == NULL)
938 return -ENOBUFS;
939 if (handle == 0) {
940 handle = gen_new_htid(tp->data, ht);
941 if (handle == 0) {
942 kfree(ht);
943 return -ENOMEM;
944 }
945 } else {
946 err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
947 handle, GFP_KERNEL);
948 if (err) {
949 kfree(ht);
950 return err;
951 }
952 }
953 ht->refcnt = 1;
954 ht->divisor = divisor;
955 ht->handle = handle;
956 ht->prio = tp->prio;
957 idr_init(&ht->handle_idr);
958 ht->flags = userflags;
959
960 err = u32_replace_hw_hnode(tp, ht, userflags, extack);
961 if (err) {
962 idr_remove(&tp_c->handle_idr, handle);
963 kfree(ht);
964 return err;
965 }
966
967 RCU_INIT_POINTER(ht->next, tp_c->hlist);
968 rcu_assign_pointer(tp_c->hlist, ht);
969 *arg = ht;
970
971 return 0;
972 }
973
974 if (tb[TCA_U32_HASH]) {
975 htid = nla_get_u32(tb[TCA_U32_HASH]);
976 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
977 ht = rtnl_dereference(tp->root);
978 htid = ht->handle;
979 } else {
980 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
981 if (!ht) {
982 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
983 return -EINVAL;
984 }
985 }
986 } else {
987 ht = rtnl_dereference(tp->root);
988 htid = ht->handle;
989 }
990
991 if (ht->divisor < TC_U32_HASH(htid)) {
992 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
993 return -EINVAL;
994 }
995
996 if (handle) {
997 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
998 NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
999 return -EINVAL;
1000 }
1001 handle = htid | TC_U32_NODE(handle);
1002 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1003 GFP_KERNEL);
1004 if (err)
1005 return err;
1006 } else
1007 handle = gen_new_kid(ht, htid);
1008
1009 if (tb[TCA_U32_SEL] == NULL) {
1010 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1011 err = -EINVAL;
1012 goto erridr;
1013 }
1014
1015 s = nla_data(tb[TCA_U32_SEL]);
1016 sel_size = struct_size(s, keys, s->nkeys);
1017 if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
1018 err = -EINVAL;
1019 goto erridr;
1020 }
1021
1022 n = kzalloc(struct_size(n, sel.keys, s->nkeys), GFP_KERNEL);
1023 if (n == NULL) {
1024 err = -ENOBUFS;
1025 goto erridr;
1026 }
1027
1028#ifdef CONFIG_CLS_U32_PERF
1029 n->pf = __alloc_percpu(struct_size(n->pf, kcnts, s->nkeys),
1030 __alignof__(struct tc_u32_pcnt));
1031 if (!n->pf) {
1032 err = -ENOBUFS;
1033 goto errfree;
1034 }
1035#endif
1036
1037 memcpy(&n->sel, s, sel_size);
1038 RCU_INIT_POINTER(n->ht_up, ht);
1039 n->handle = handle;
1040 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1041 n->flags = userflags;
1042
1043 err = tcf_exts_init(&n->exts, net, TCA_U32_ACT, TCA_U32_POLICE);
1044 if (err < 0)
1045 goto errout;
1046
1047#ifdef CONFIG_CLS_U32_MARK
1048 n->pcpu_success = alloc_percpu(u32);
1049 if (!n->pcpu_success) {
1050 err = -ENOMEM;
1051 goto errout;
1052 }
1053
1054 if (tb[TCA_U32_MARK]) {
1055 struct tc_u32_mark *mark;
1056
1057 mark = nla_data(tb[TCA_U32_MARK]);
1058 n->val = mark->val;
1059 n->mask = mark->mask;
1060 }
1061#endif
1062
1063 err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE], flags,
1064 extack);
1065 if (err == 0) {
1066 struct tc_u_knode __rcu **ins;
1067 struct tc_u_knode *pins;
1068
1069 err = u32_replace_hw_knode(tp, n, flags, extack);
1070 if (err)
1071 goto errhw;
1072
1073 if (!tc_in_hw(n->flags))
1074 n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1075
1076 ins = &ht->ht[TC_U32_HASH(handle)];
1077 for (pins = rtnl_dereference(*ins); pins;
1078 ins = &pins->next, pins = rtnl_dereference(*ins))
1079 if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1080 break;
1081
1082 RCU_INIT_POINTER(n->next, pins);
1083 rcu_assign_pointer(*ins, n);
1084 tp_c->knodes++;
1085 *arg = n;
1086 return 0;
1087 }
1088
1089errhw:
1090#ifdef CONFIG_CLS_U32_MARK
1091 free_percpu(n->pcpu_success);
1092#endif
1093
1094errout:
1095 tcf_exts_destroy(&n->exts);
1096#ifdef CONFIG_CLS_U32_PERF
1097errfree:
1098 free_percpu(n->pf);
1099#endif
1100 kfree(n);
1101erridr:
1102 idr_remove(&ht->handle_idr, handle);
1103 return err;
1104}
1105
1106static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg,
1107 bool rtnl_held)
1108{
1109 struct tc_u_common *tp_c = tp->data;
1110 struct tc_u_hnode *ht;
1111 struct tc_u_knode *n;
1112 unsigned int h;
1113
1114 if (arg->stop)
1115 return;
1116
1117 for (ht = rtnl_dereference(tp_c->hlist);
1118 ht;
1119 ht = rtnl_dereference(ht->next)) {
1120 if (ht->prio != tp->prio)
1121 continue;
1122 if (arg->count >= arg->skip) {
1123 if (arg->fn(tp, ht, arg) < 0) {
1124 arg->stop = 1;
1125 return;
1126 }
1127 }
1128 arg->count++;
1129 for (h = 0; h <= ht->divisor; h++) {
1130 for (n = rtnl_dereference(ht->ht[h]);
1131 n;
1132 n = rtnl_dereference(n->next)) {
1133 if (arg->count < arg->skip) {
1134 arg->count++;
1135 continue;
1136 }
1137 if (arg->fn(tp, n, arg) < 0) {
1138 arg->stop = 1;
1139 return;
1140 }
1141 arg->count++;
1142 }
1143 }
1144 }
1145}
1146
1147static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
1148 bool add, flow_setup_cb_t *cb, void *cb_priv,
1149 struct netlink_ext_ack *extack)
1150{
1151 struct tc_cls_u32_offload cls_u32 = {};
1152 int err;
1153
1154 tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack);
1155 cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE;
1156 cls_u32.hnode.divisor = ht->divisor;
1157 cls_u32.hnode.handle = ht->handle;
1158 cls_u32.hnode.prio = ht->prio;
1159
1160 err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv);
1161 if (err && add && tc_skip_sw(ht->flags))
1162 return err;
1163
1164 return 0;
1165}
1166
1167static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n,
1168 bool add, flow_setup_cb_t *cb, void *cb_priv,
1169 struct netlink_ext_ack *extack)
1170{
1171 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
1172 struct tcf_block *block = tp->chain->block;
1173 struct tc_cls_u32_offload cls_u32 = {};
1174
1175 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
1176 cls_u32.command = add ?
1177 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE;
1178 cls_u32.knode.handle = n->handle;
1179
1180 if (add) {
1181 cls_u32.knode.fshift = n->fshift;
1182#ifdef CONFIG_CLS_U32_MARK
1183 cls_u32.knode.val = n->val;
1184 cls_u32.knode.mask = n->mask;
1185#else
1186 cls_u32.knode.val = 0;
1187 cls_u32.knode.mask = 0;
1188#endif
1189 cls_u32.knode.sel = &n->sel;
1190 cls_u32.knode.res = &n->res;
1191 cls_u32.knode.exts = &n->exts;
1192 if (n->ht_down)
1193 cls_u32.knode.link_handle = ht->handle;
1194 }
1195
1196 return tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSU32,
1197 &cls_u32, cb_priv, &n->flags,
1198 &n->in_hw_count);
1199}
1200
1201static int u32_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
1202 void *cb_priv, struct netlink_ext_ack *extack)
1203{
1204 struct tc_u_common *tp_c = tp->data;
1205 struct tc_u_hnode *ht;
1206 struct tc_u_knode *n;
1207 unsigned int h;
1208 int err;
1209
1210 for (ht = rtnl_dereference(tp_c->hlist);
1211 ht;
1212 ht = rtnl_dereference(ht->next)) {
1213 if (ht->prio != tp->prio)
1214 continue;
1215
1216
1217
1218
1219
1220 if (add && !tc_skip_hw(ht->flags)) {
1221 err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv,
1222 extack);
1223 if (err)
1224 return err;
1225 }
1226
1227 for (h = 0; h <= ht->divisor; h++) {
1228 for (n = rtnl_dereference(ht->ht[h]);
1229 n;
1230 n = rtnl_dereference(n->next)) {
1231 if (tc_skip_hw(n->flags))
1232 continue;
1233
1234 err = u32_reoffload_knode(tp, n, add, cb,
1235 cb_priv, extack);
1236 if (err)
1237 return err;
1238 }
1239 }
1240
1241 if (!add && !tc_skip_hw(ht->flags))
1242 u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack);
1243 }
1244
1245 return 0;
1246}
1247
1248static void u32_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
1249 unsigned long base)
1250{
1251 struct tc_u_knode *n = fh;
1252
1253 if (n && n->res.classid == classid) {
1254 if (cl)
1255 __tcf_bind_filter(q, &n->res, base);
1256 else
1257 __tcf_unbind_filter(q, &n->res);
1258 }
1259}
1260
1261static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1262 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
1263{
1264 struct tc_u_knode *n = fh;
1265 struct tc_u_hnode *ht_up, *ht_down;
1266 struct nlattr *nest;
1267
1268 if (n == NULL)
1269 return skb->len;
1270
1271 t->tcm_handle = n->handle;
1272
1273 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
1274 if (nest == NULL)
1275 goto nla_put_failure;
1276
1277 if (TC_U32_KEY(n->handle) == 0) {
1278 struct tc_u_hnode *ht = fh;
1279 u32 divisor = ht->divisor + 1;
1280
1281 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1282 goto nla_put_failure;
1283 } else {
1284#ifdef CONFIG_CLS_U32_PERF
1285 struct tc_u32_pcnt *gpf;
1286 int cpu;
1287#endif
1288
1289 if (nla_put(skb, TCA_U32_SEL, struct_size(&n->sel, keys, n->sel.nkeys),
1290 &n->sel))
1291 goto nla_put_failure;
1292
1293 ht_up = rtnl_dereference(n->ht_up);
1294 if (ht_up) {
1295 u32 htid = n->handle & 0xFFFFF000;
1296 if (nla_put_u32(skb, TCA_U32_HASH, htid))
1297 goto nla_put_failure;
1298 }
1299 if (n->res.classid &&
1300 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1301 goto nla_put_failure;
1302
1303 ht_down = rtnl_dereference(n->ht_down);
1304 if (ht_down &&
1305 nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1306 goto nla_put_failure;
1307
1308 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1309 goto nla_put_failure;
1310
1311#ifdef CONFIG_CLS_U32_MARK
1312 if ((n->val || n->mask)) {
1313 struct tc_u32_mark mark = {.val = n->val,
1314 .mask = n->mask,
1315 .success = 0};
1316 int cpum;
1317
1318 for_each_possible_cpu(cpum) {
1319 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1320
1321 mark.success += cnt;
1322 }
1323
1324 if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1325 goto nla_put_failure;
1326 }
1327#endif
1328
1329 if (tcf_exts_dump(skb, &n->exts) < 0)
1330 goto nla_put_failure;
1331
1332 if (n->ifindex) {
1333 struct net_device *dev;
1334 dev = __dev_get_by_index(net, n->ifindex);
1335 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1336 goto nla_put_failure;
1337 }
1338#ifdef CONFIG_CLS_U32_PERF
1339 gpf = kzalloc(struct_size(gpf, kcnts, n->sel.nkeys), GFP_KERNEL);
1340 if (!gpf)
1341 goto nla_put_failure;
1342
1343 for_each_possible_cpu(cpu) {
1344 int i;
1345 struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1346
1347 gpf->rcnt += pf->rcnt;
1348 gpf->rhit += pf->rhit;
1349 for (i = 0; i < n->sel.nkeys; i++)
1350 gpf->kcnts[i] += pf->kcnts[i];
1351 }
1352
1353 if (nla_put_64bit(skb, TCA_U32_PCNT, struct_size(gpf, kcnts, n->sel.nkeys),
1354 gpf, TCA_U32_PAD)) {
1355 kfree(gpf);
1356 goto nla_put_failure;
1357 }
1358 kfree(gpf);
1359#endif
1360 }
1361
1362 nla_nest_end(skb, nest);
1363
1364 if (TC_U32_KEY(n->handle))
1365 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1366 goto nla_put_failure;
1367 return skb->len;
1368
1369nla_put_failure:
1370 nla_nest_cancel(skb, nest);
1371 return -1;
1372}
1373
1374static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1375 .kind = "u32",
1376 .classify = u32_classify,
1377 .init = u32_init,
1378 .destroy = u32_destroy,
1379 .get = u32_get,
1380 .change = u32_change,
1381 .delete = u32_delete,
1382 .walk = u32_walk,
1383 .reoffload = u32_reoffload,
1384 .dump = u32_dump,
1385 .bind_class = u32_bind_class,
1386 .owner = THIS_MODULE,
1387};
1388
1389static int __init init_u32(void)
1390{
1391 int i, ret;
1392
1393 pr_info("u32 classifier\n");
1394#ifdef CONFIG_CLS_U32_PERF
1395 pr_info(" Performance counters on\n");
1396#endif
1397 pr_info(" input device check on\n");
1398#ifdef CONFIG_NET_CLS_ACT
1399 pr_info(" Actions configured\n");
1400#endif
1401 tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1402 sizeof(struct hlist_head),
1403 GFP_KERNEL);
1404 if (!tc_u_common_hash)
1405 return -ENOMEM;
1406
1407 for (i = 0; i < U32_HASH_SIZE; i++)
1408 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1409
1410 ret = register_tcf_proto_ops(&cls_u32_ops);
1411 if (ret)
1412 kvfree(tc_u_common_hash);
1413 return ret;
1414}
1415
1416static void __exit exit_u32(void)
1417{
1418 unregister_tcf_proto_ops(&cls_u32_ops);
1419 kvfree(tc_u_common_hash);
1420}
1421
1422module_init(init_u32)
1423module_exit(exit_u32)
1424MODULE_LICENSE("GPL");
1425
