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