]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/sched/cls_u32.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge remote-tracking branches 'asoc/topic/dwc', 'asoc/topic/fallthrough', 'asoc...
[mirror_ubuntu-bionic-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/netdevice.h>
49
50 struct tc_u_knode {
51 struct tc_u_knode __rcu *next;
52 u32 handle;
53 struct tc_u_hnode __rcu *ht_up;
54 struct tcf_exts exts;
55 #ifdef CONFIG_NET_CLS_IND
56 int ifindex;
57 #endif
58 u8 fshift;
59 struct tcf_result res;
60 struct tc_u_hnode __rcu *ht_down;
61 #ifdef CONFIG_CLS_U32_PERF
62 struct tc_u32_pcnt __percpu *pf;
63 #endif
64 u32 flags;
65 #ifdef CONFIG_CLS_U32_MARK
66 u32 val;
67 u32 mask;
68 u32 __percpu *pcpu_success;
69 #endif
70 struct tcf_proto *tp;
71 union {
72 struct work_struct work;
73 struct rcu_head rcu;
74 };
75 /* The 'sel' field MUST be the last field in structure to allow for
76 * tc_u32_keys allocated at end of structure.
77 */
78 struct tc_u32_sel sel;
79 };
80
81 struct tc_u_hnode {
82 struct tc_u_hnode __rcu *next;
83 u32 handle;
84 u32 prio;
85 struct tc_u_common *tp_c;
86 int refcnt;
87 unsigned int divisor;
88 struct rcu_head rcu;
89 /* The 'ht' field MUST be the last field in structure to allow for
90 * more entries allocated at end of structure.
91 */
92 struct tc_u_knode __rcu *ht[1];
93 };
94
95 struct tc_u_common {
96 struct tc_u_hnode __rcu *hlist;
97 struct Qdisc *q;
98 int refcnt;
99 u32 hgenerator;
100 struct hlist_node hnode;
101 struct rcu_head rcu;
102 };
103
104 static inline unsigned int u32_hash_fold(__be32 key,
105 const struct tc_u32_sel *sel,
106 u8 fshift)
107 {
108 unsigned int h = ntohl(key & sel->hmask) >> fshift;
109
110 return h;
111 }
112
113 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
114 struct tcf_result *res)
115 {
116 struct {
117 struct tc_u_knode *knode;
118 unsigned int off;
119 } stack[TC_U32_MAXDEPTH];
120
121 struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
122 unsigned int off = skb_network_offset(skb);
123 struct tc_u_knode *n;
124 int sdepth = 0;
125 int off2 = 0;
126 int sel = 0;
127 #ifdef CONFIG_CLS_U32_PERF
128 int j;
129 #endif
130 int i, r;
131
132 next_ht:
133 n = rcu_dereference_bh(ht->ht[sel]);
134
135 next_knode:
136 if (n) {
137 struct tc_u32_key *key = n->sel.keys;
138
139 #ifdef CONFIG_CLS_U32_PERF
140 __this_cpu_inc(n->pf->rcnt);
141 j = 0;
142 #endif
143
144 if (tc_skip_sw(n->flags)) {
145 n = rcu_dereference_bh(n->next);
146 goto next_knode;
147 }
148
149 #ifdef CONFIG_CLS_U32_MARK
150 if ((skb->mark & n->mask) != n->val) {
151 n = rcu_dereference_bh(n->next);
152 goto next_knode;
153 } else {
154 __this_cpu_inc(*n->pcpu_success);
155 }
156 #endif
157
158 for (i = n->sel.nkeys; i > 0; i--, key++) {
159 int toff = off + key->off + (off2 & key->offmask);
160 __be32 *data, hdata;
161
162 if (skb_headroom(skb) + toff > INT_MAX)
163 goto out;
164
165 data = skb_header_pointer(skb, toff, 4, &hdata);
166 if (!data)
167 goto out;
168 if ((*data ^ key->val) & key->mask) {
169 n = rcu_dereference_bh(n->next);
170 goto next_knode;
171 }
172 #ifdef CONFIG_CLS_U32_PERF
173 __this_cpu_inc(n->pf->kcnts[j]);
174 j++;
175 #endif
176 }
177
178 ht = rcu_dereference_bh(n->ht_down);
179 if (!ht) {
180 check_terminal:
181 if (n->sel.flags & TC_U32_TERMINAL) {
182
183 *res = n->res;
184 #ifdef CONFIG_NET_CLS_IND
185 if (!tcf_match_indev(skb, n->ifindex)) {
186 n = rcu_dereference_bh(n->next);
187 goto next_knode;
188 }
189 #endif
190 #ifdef CONFIG_CLS_U32_PERF
191 __this_cpu_inc(n->pf->rhit);
192 #endif
193 r = tcf_exts_exec(skb, &n->exts, res);
194 if (r < 0) {
195 n = rcu_dereference_bh(n->next);
196 goto next_knode;
197 }
198
199 return r;
200 }
201 n = rcu_dereference_bh(n->next);
202 goto next_knode;
203 }
204
205 /* PUSH */
206 if (sdepth >= TC_U32_MAXDEPTH)
207 goto deadloop;
208 stack[sdepth].knode = n;
209 stack[sdepth].off = off;
210 sdepth++;
211
212 ht = rcu_dereference_bh(n->ht_down);
213 sel = 0;
214 if (ht->divisor) {
215 __be32 *data, hdata;
216
217 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
218 &hdata);
219 if (!data)
220 goto out;
221 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
222 n->fshift);
223 }
224 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
225 goto next_ht;
226
227 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
228 off2 = n->sel.off + 3;
229 if (n->sel.flags & TC_U32_VAROFFSET) {
230 __be16 *data, hdata;
231
232 data = skb_header_pointer(skb,
233 off + n->sel.offoff,
234 2, &hdata);
235 if (!data)
236 goto out;
237 off2 += ntohs(n->sel.offmask & *data) >>
238 n->sel.offshift;
239 }
240 off2 &= ~3;
241 }
242 if (n->sel.flags & TC_U32_EAT) {
243 off += off2;
244 off2 = 0;
245 }
246
247 if (off < skb->len)
248 goto next_ht;
249 }
250
251 /* POP */
252 if (sdepth--) {
253 n = stack[sdepth].knode;
254 ht = rcu_dereference_bh(n->ht_up);
255 off = stack[sdepth].off;
256 goto check_terminal;
257 }
258 out:
259 return -1;
260
261 deadloop:
262 net_warn_ratelimited("cls_u32: dead loop\n");
263 return -1;
264 }
265
266 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
267 {
268 struct tc_u_hnode *ht;
269
270 for (ht = rtnl_dereference(tp_c->hlist);
271 ht;
272 ht = rtnl_dereference(ht->next))
273 if (ht->handle == handle)
274 break;
275
276 return ht;
277 }
278
279 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
280 {
281 unsigned int sel;
282 struct tc_u_knode *n = NULL;
283
284 sel = TC_U32_HASH(handle);
285 if (sel > ht->divisor)
286 goto out;
287
288 for (n = rtnl_dereference(ht->ht[sel]);
289 n;
290 n = rtnl_dereference(n->next))
291 if (n->handle == handle)
292 break;
293 out:
294 return n;
295 }
296
297
298 static void *u32_get(struct tcf_proto *tp, u32 handle)
299 {
300 struct tc_u_hnode *ht;
301 struct tc_u_common *tp_c = tp->data;
302
303 if (TC_U32_HTID(handle) == TC_U32_ROOT)
304 ht = rtnl_dereference(tp->root);
305 else
306 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
307
308 if (!ht)
309 return NULL;
310
311 if (TC_U32_KEY(handle) == 0)
312 return ht;
313
314 return u32_lookup_key(ht, handle);
315 }
316
317 static u32 gen_new_htid(struct tc_u_common *tp_c)
318 {
319 int i = 0x800;
320
321 /* hgenerator only used inside rtnl lock it is safe to increment
322 * without read _copy_ update semantics
323 */
324 do {
325 if (++tp_c->hgenerator == 0x7FF)
326 tp_c->hgenerator = 1;
327 } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
328
329 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
330 }
331
332 static struct hlist_head *tc_u_common_hash;
333
334 #define U32_HASH_SHIFT 10
335 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
336
337 static unsigned int tc_u_hash(const struct tcf_proto *tp)
338 {
339 struct net_device *dev = tp->q->dev_queue->dev;
340 u32 qhandle = tp->q->handle;
341 int ifindex = dev->ifindex;
342
343 return hash_64((u64)ifindex << 32 | qhandle, U32_HASH_SHIFT);
344 }
345
346 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
347 {
348 struct tc_u_common *tc;
349 unsigned int h;
350
351 h = tc_u_hash(tp);
352 hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
353 if (tc->q == tp->q)
354 return tc;
355 }
356 return NULL;
357 }
358
359 static int u32_init(struct tcf_proto *tp)
360 {
361 struct tc_u_hnode *root_ht;
362 struct tc_u_common *tp_c;
363 unsigned int h;
364
365 tp_c = tc_u_common_find(tp);
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) : 0x80000000;
373 root_ht->prio = tp->prio;
374
375 if (tp_c == NULL) {
376 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
377 if (tp_c == NULL) {
378 kfree(root_ht);
379 return -ENOBUFS;
380 }
381 tp_c->q = tp->q;
382 INIT_HLIST_NODE(&tp_c->hnode);
383
384 h = tc_u_hash(tp);
385 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
386 }
387
388 tp_c->refcnt++;
389 RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
390 rcu_assign_pointer(tp_c->hlist, root_ht);
391 root_ht->tp_c = tp_c;
392
393 rcu_assign_pointer(tp->root, root_ht);
394 tp->data = tp_c;
395 return 0;
396 }
397
398 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
399 bool free_pf)
400 {
401 tcf_exts_destroy(&n->exts);
402 if (n->ht_down)
403 n->ht_down->refcnt--;
404 #ifdef CONFIG_CLS_U32_PERF
405 if (free_pf)
406 free_percpu(n->pf);
407 #endif
408 #ifdef CONFIG_CLS_U32_MARK
409 if (free_pf)
410 free_percpu(n->pcpu_success);
411 #endif
412 kfree(n);
413 return 0;
414 }
415
416 /* u32_delete_key_rcu should be called when free'ing a copied
417 * version of a tc_u_knode obtained from u32_init_knode(). When
418 * copies are obtained from u32_init_knode() the statistics are
419 * shared between the old and new copies to allow readers to
420 * continue to update the statistics during the copy. To support
421 * this the u32_delete_key_rcu variant does not free the percpu
422 * statistics.
423 */
424 static void u32_delete_key_work(struct work_struct *work)
425 {
426 struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
427
428 rtnl_lock();
429 u32_destroy_key(key->tp, key, false);
430 rtnl_unlock();
431 }
432
433 static void u32_delete_key_rcu(struct rcu_head *rcu)
434 {
435 struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
436
437 INIT_WORK(&key->work, u32_delete_key_work);
438 tcf_queue_work(&key->work);
439 }
440
441 /* u32_delete_key_freepf_rcu is the rcu callback variant
442 * that free's the entire structure including the statistics
443 * percpu variables. Only use this if the key is not a copy
444 * returned by u32_init_knode(). See u32_delete_key_rcu()
445 * for the variant that should be used with keys return from
446 * u32_init_knode()
447 */
448 static void u32_delete_key_freepf_work(struct work_struct *work)
449 {
450 struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
451
452 rtnl_lock();
453 u32_destroy_key(key->tp, key, true);
454 rtnl_unlock();
455 }
456
457 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
458 {
459 struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
460
461 INIT_WORK(&key->work, u32_delete_key_freepf_work);
462 tcf_queue_work(&key->work);
463 }
464
465 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
466 {
467 struct tc_u_knode __rcu **kp;
468 struct tc_u_knode *pkp;
469 struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
470
471 if (ht) {
472 kp = &ht->ht[TC_U32_HASH(key->handle)];
473 for (pkp = rtnl_dereference(*kp); pkp;
474 kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
475 if (pkp == key) {
476 RCU_INIT_POINTER(*kp, key->next);
477
478 tcf_unbind_filter(tp, &key->res);
479 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
480 return 0;
481 }
482 }
483 }
484 WARN_ON(1);
485 return 0;
486 }
487
488 static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle)
489 {
490 struct net_device *dev = tp->q->dev_queue->dev;
491 struct tc_cls_u32_offload cls_u32 = {};
492
493 if (!tc_should_offload(dev, 0))
494 return;
495
496 tc_cls_common_offload_init(&cls_u32.common, tp);
497 cls_u32.command = TC_CLSU32_DELETE_KNODE;
498 cls_u32.knode.handle = handle;
499
500 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
501 }
502
503 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
504 u32 flags)
505 {
506 struct net_device *dev = tp->q->dev_queue->dev;
507 struct tc_cls_u32_offload cls_u32 = {};
508 int err;
509
510 if (!tc_should_offload(dev, flags))
511 return tc_skip_sw(flags) ? -EINVAL : 0;
512
513 tc_cls_common_offload_init(&cls_u32.common, tp);
514 cls_u32.command = TC_CLSU32_NEW_HNODE;
515 cls_u32.hnode.divisor = h->divisor;
516 cls_u32.hnode.handle = h->handle;
517 cls_u32.hnode.prio = h->prio;
518
519 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
520 if (tc_skip_sw(flags))
521 return err;
522
523 return 0;
524 }
525
526 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h)
527 {
528 struct net_device *dev = tp->q->dev_queue->dev;
529 struct tc_cls_u32_offload cls_u32 = {};
530
531 if (!tc_should_offload(dev, 0))
532 return;
533
534 tc_cls_common_offload_init(&cls_u32.common, tp);
535 cls_u32.command = TC_CLSU32_DELETE_HNODE;
536 cls_u32.hnode.divisor = h->divisor;
537 cls_u32.hnode.handle = h->handle;
538 cls_u32.hnode.prio = h->prio;
539
540 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
541 }
542
543 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
544 u32 flags)
545 {
546 struct net_device *dev = tp->q->dev_queue->dev;
547 struct tc_cls_u32_offload cls_u32 = {};
548 int err;
549
550 if (!tc_should_offload(dev, flags))
551 return tc_skip_sw(flags) ? -EINVAL : 0;
552
553 tc_cls_common_offload_init(&cls_u32.common, tp);
554 cls_u32.command = TC_CLSU32_REPLACE_KNODE;
555 cls_u32.knode.handle = n->handle;
556 cls_u32.knode.fshift = n->fshift;
557 #ifdef CONFIG_CLS_U32_MARK
558 cls_u32.knode.val = n->val;
559 cls_u32.knode.mask = n->mask;
560 #else
561 cls_u32.knode.val = 0;
562 cls_u32.knode.mask = 0;
563 #endif
564 cls_u32.knode.sel = &n->sel;
565 cls_u32.knode.exts = &n->exts;
566 if (n->ht_down)
567 cls_u32.knode.link_handle = n->ht_down->handle;
568
569 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
570
571 if (!err)
572 n->flags |= TCA_CLS_FLAGS_IN_HW;
573
574 if (tc_skip_sw(flags))
575 return err;
576
577 return 0;
578 }
579
580 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
581 {
582 struct tc_u_knode *n;
583 unsigned int h;
584
585 for (h = 0; h <= ht->divisor; h++) {
586 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
587 RCU_INIT_POINTER(ht->ht[h],
588 rtnl_dereference(n->next));
589 tcf_unbind_filter(tp, &n->res);
590 u32_remove_hw_knode(tp, n->handle);
591 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
592 }
593 }
594 }
595
596 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
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);
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);
612 RCU_INIT_POINTER(*hn, ht->next);
613 kfree_rcu(ht, rcu);
614 return 0;
615 }
616 }
617
618 return -ENOENT;
619 }
620
621 static bool ht_empty(struct tc_u_hnode *ht)
622 {
623 unsigned int h;
624
625 for (h = 0; h <= ht->divisor; h++)
626 if (rcu_access_pointer(ht->ht[h]))
627 return false;
628
629 return true;
630 }
631
632 static void u32_destroy(struct tcf_proto *tp)
633 {
634 struct tc_u_common *tp_c = tp->data;
635 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
636
637 WARN_ON(root_ht == NULL);
638
639 if (root_ht && --root_ht->refcnt == 0)
640 u32_destroy_hnode(tp, root_ht);
641
642 if (--tp_c->refcnt == 0) {
643 struct tc_u_hnode *ht;
644
645 hlist_del(&tp_c->hnode);
646
647 for (ht = rtnl_dereference(tp_c->hlist);
648 ht;
649 ht = rtnl_dereference(ht->next)) {
650 ht->refcnt--;
651 u32_clear_hnode(tp, ht);
652 }
653
654 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
655 RCU_INIT_POINTER(tp_c->hlist, ht->next);
656 kfree_rcu(ht, rcu);
657 }
658
659 kfree(tp_c);
660 }
661
662 tp->data = NULL;
663 }
664
665 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last)
666 {
667 struct tc_u_hnode *ht = arg;
668 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
669 struct tc_u_common *tp_c = tp->data;
670 int ret = 0;
671
672 if (ht == NULL)
673 goto out;
674
675 if (TC_U32_KEY(ht->handle)) {
676 u32_remove_hw_knode(tp, ht->handle);
677 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
678 goto out;
679 }
680
681 if (root_ht == ht)
682 return -EINVAL;
683
684 if (ht->refcnt == 1) {
685 ht->refcnt--;
686 u32_destroy_hnode(tp, ht);
687 } else {
688 return -EBUSY;
689 }
690
691 out:
692 *last = true;
693 if (root_ht) {
694 if (root_ht->refcnt > 1) {
695 *last = false;
696 goto ret;
697 }
698 if (root_ht->refcnt == 1) {
699 if (!ht_empty(root_ht)) {
700 *last = false;
701 goto ret;
702 }
703 }
704 }
705
706 if (tp_c->refcnt > 1) {
707 *last = false;
708 goto ret;
709 }
710
711 if (tp_c->refcnt == 1) {
712 struct tc_u_hnode *ht;
713
714 for (ht = rtnl_dereference(tp_c->hlist);
715 ht;
716 ht = rtnl_dereference(ht->next))
717 if (!ht_empty(ht)) {
718 *last = false;
719 break;
720 }
721 }
722
723 ret:
724 return ret;
725 }
726
727 #define NR_U32_NODE (1<<12)
728 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
729 {
730 struct tc_u_knode *n;
731 unsigned long i;
732 unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long),
733 GFP_KERNEL);
734 if (!bitmap)
735 return handle | 0xFFF;
736
737 for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]);
738 n;
739 n = rtnl_dereference(n->next))
740 set_bit(TC_U32_NODE(n->handle), bitmap);
741
742 i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800);
743 if (i >= NR_U32_NODE)
744 i = find_next_zero_bit(bitmap, NR_U32_NODE, 1);
745
746 kfree(bitmap);
747 return handle | (i >= NR_U32_NODE ? 0xFFF : i);
748 }
749
750 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
751 [TCA_U32_CLASSID] = { .type = NLA_U32 },
752 [TCA_U32_HASH] = { .type = NLA_U32 },
753 [TCA_U32_LINK] = { .type = NLA_U32 },
754 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
755 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
756 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
757 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
758 [TCA_U32_FLAGS] = { .type = NLA_U32 },
759 };
760
761 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
762 unsigned long base, struct tc_u_hnode *ht,
763 struct tc_u_knode *n, struct nlattr **tb,
764 struct nlattr *est, bool ovr)
765 {
766 int err;
767
768 err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr);
769 if (err < 0)
770 return err;
771
772 if (tb[TCA_U32_LINK]) {
773 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
774 struct tc_u_hnode *ht_down = NULL, *ht_old;
775
776 if (TC_U32_KEY(handle))
777 return -EINVAL;
778
779 if (handle) {
780 ht_down = u32_lookup_ht(ht->tp_c, handle);
781
782 if (ht_down == NULL)
783 return -EINVAL;
784 ht_down->refcnt++;
785 }
786
787 ht_old = rtnl_dereference(n->ht_down);
788 rcu_assign_pointer(n->ht_down, ht_down);
789
790 if (ht_old)
791 ht_old->refcnt--;
792 }
793 if (tb[TCA_U32_CLASSID]) {
794 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
795 tcf_bind_filter(tp, &n->res, base);
796 }
797
798 #ifdef CONFIG_NET_CLS_IND
799 if (tb[TCA_U32_INDEV]) {
800 int ret;
801 ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
802 if (ret < 0)
803 return -EINVAL;
804 n->ifindex = ret;
805 }
806 #endif
807 return 0;
808 }
809
810 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
811 struct tc_u_knode *n)
812 {
813 struct tc_u_knode __rcu **ins;
814 struct tc_u_knode *pins;
815 struct tc_u_hnode *ht;
816
817 if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
818 ht = rtnl_dereference(tp->root);
819 else
820 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
821
822 ins = &ht->ht[TC_U32_HASH(n->handle)];
823
824 /* The node must always exist for it to be replaced if this is not the
825 * case then something went very wrong elsewhere.
826 */
827 for (pins = rtnl_dereference(*ins); ;
828 ins = &pins->next, pins = rtnl_dereference(*ins))
829 if (pins->handle == n->handle)
830 break;
831
832 RCU_INIT_POINTER(n->next, pins->next);
833 rcu_assign_pointer(*ins, n);
834 }
835
836 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
837 struct tc_u_knode *n)
838 {
839 struct tc_u_knode *new;
840 struct tc_u32_sel *s = &n->sel;
841
842 new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
843 GFP_KERNEL);
844
845 if (!new)
846 return NULL;
847
848 RCU_INIT_POINTER(new->next, n->next);
849 new->handle = n->handle;
850 RCU_INIT_POINTER(new->ht_up, n->ht_up);
851
852 #ifdef CONFIG_NET_CLS_IND
853 new->ifindex = n->ifindex;
854 #endif
855 new->fshift = n->fshift;
856 new->res = n->res;
857 new->flags = n->flags;
858 RCU_INIT_POINTER(new->ht_down, n->ht_down);
859
860 /* bump reference count as long as we hold pointer to structure */
861 if (new->ht_down)
862 new->ht_down->refcnt++;
863
864 #ifdef CONFIG_CLS_U32_PERF
865 /* Statistics may be incremented by readers during update
866 * so we must keep them in tact. When the node is later destroyed
867 * a special destroy call must be made to not free the pf memory.
868 */
869 new->pf = n->pf;
870 #endif
871
872 #ifdef CONFIG_CLS_U32_MARK
873 new->val = n->val;
874 new->mask = n->mask;
875 /* Similarly success statistics must be moved as pointers */
876 new->pcpu_success = n->pcpu_success;
877 #endif
878 new->tp = tp;
879 memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
880
881 if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
882 kfree(new);
883 return NULL;
884 }
885
886 return new;
887 }
888
889 static int u32_change(struct net *net, struct sk_buff *in_skb,
890 struct tcf_proto *tp, unsigned long base, u32 handle,
891 struct nlattr **tca, void **arg, bool ovr)
892 {
893 struct tc_u_common *tp_c = tp->data;
894 struct tc_u_hnode *ht;
895 struct tc_u_knode *n;
896 struct tc_u32_sel *s;
897 struct nlattr *opt = tca[TCA_OPTIONS];
898 struct nlattr *tb[TCA_U32_MAX + 1];
899 u32 htid, flags = 0;
900 int err;
901 #ifdef CONFIG_CLS_U32_PERF
902 size_t size;
903 #endif
904
905 if (opt == NULL)
906 return handle ? -EINVAL : 0;
907
908 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, NULL);
909 if (err < 0)
910 return err;
911
912 if (tb[TCA_U32_FLAGS]) {
913 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
914 if (!tc_flags_valid(flags))
915 return -EINVAL;
916 }
917
918 n = *arg;
919 if (n) {
920 struct tc_u_knode *new;
921
922 if (TC_U32_KEY(n->handle) == 0)
923 return -EINVAL;
924
925 if (n->flags != flags)
926 return -EINVAL;
927
928 new = u32_init_knode(tp, n);
929 if (!new)
930 return -ENOMEM;
931
932 err = u32_set_parms(net, tp, base,
933 rtnl_dereference(n->ht_up), new, tb,
934 tca[TCA_RATE], ovr);
935
936 if (err) {
937 u32_destroy_key(tp, new, false);
938 return err;
939 }
940
941 err = u32_replace_hw_knode(tp, new, flags);
942 if (err) {
943 u32_destroy_key(tp, new, false);
944 return err;
945 }
946
947 if (!tc_in_hw(new->flags))
948 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
949
950 u32_replace_knode(tp, tp_c, new);
951 tcf_unbind_filter(tp, &n->res);
952 call_rcu(&n->rcu, u32_delete_key_rcu);
953 return 0;
954 }
955
956 if (tb[TCA_U32_DIVISOR]) {
957 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
958
959 if (--divisor > 0x100)
960 return -EINVAL;
961 if (TC_U32_KEY(handle))
962 return -EINVAL;
963 if (handle == 0) {
964 handle = gen_new_htid(tp->data);
965 if (handle == 0)
966 return -ENOMEM;
967 }
968 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
969 if (ht == NULL)
970 return -ENOBUFS;
971 ht->tp_c = tp_c;
972 ht->refcnt = 1;
973 ht->divisor = divisor;
974 ht->handle = handle;
975 ht->prio = tp->prio;
976
977 err = u32_replace_hw_hnode(tp, ht, flags);
978 if (err) {
979 kfree(ht);
980 return err;
981 }
982
983 RCU_INIT_POINTER(ht->next, tp_c->hlist);
984 rcu_assign_pointer(tp_c->hlist, ht);
985 *arg = ht;
986
987 return 0;
988 }
989
990 if (tb[TCA_U32_HASH]) {
991 htid = nla_get_u32(tb[TCA_U32_HASH]);
992 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
993 ht = rtnl_dereference(tp->root);
994 htid = ht->handle;
995 } else {
996 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
997 if (ht == NULL)
998 return -EINVAL;
999 }
1000 } else {
1001 ht = rtnl_dereference(tp->root);
1002 htid = ht->handle;
1003 }
1004
1005 if (ht->divisor < TC_U32_HASH(htid))
1006 return -EINVAL;
1007
1008 if (handle) {
1009 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
1010 return -EINVAL;
1011 handle = htid | TC_U32_NODE(handle);
1012 } else
1013 handle = gen_new_kid(ht, htid);
1014
1015 if (tb[TCA_U32_SEL] == NULL)
1016 return -EINVAL;
1017
1018 s = nla_data(tb[TCA_U32_SEL]);
1019
1020 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1021 if (n == NULL)
1022 return -ENOBUFS;
1023
1024 #ifdef CONFIG_CLS_U32_PERF
1025 size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1026 n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1027 if (!n->pf) {
1028 kfree(n);
1029 return -ENOBUFS;
1030 }
1031 #endif
1032
1033 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1034 RCU_INIT_POINTER(n->ht_up, ht);
1035 n->handle = handle;
1036 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1037 n->flags = flags;
1038 n->tp = tp;
1039
1040 err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1041 if (err < 0)
1042 goto errout;
1043
1044 #ifdef CONFIG_CLS_U32_MARK
1045 n->pcpu_success = alloc_percpu(u32);
1046 if (!n->pcpu_success) {
1047 err = -ENOMEM;
1048 goto errout;
1049 }
1050
1051 if (tb[TCA_U32_MARK]) {
1052 struct tc_u32_mark *mark;
1053
1054 mark = nla_data(tb[TCA_U32_MARK]);
1055 n->val = mark->val;
1056 n->mask = mark->mask;
1057 }
1058 #endif
1059
1060 err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
1061 if (err == 0) {
1062 struct tc_u_knode __rcu **ins;
1063 struct tc_u_knode *pins;
1064
1065 err = u32_replace_hw_knode(tp, n, flags);
1066 if (err)
1067 goto errhw;
1068
1069 if (!tc_in_hw(n->flags))
1070 n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1071
1072 ins = &ht->ht[TC_U32_HASH(handle)];
1073 for (pins = rtnl_dereference(*ins); pins;
1074 ins = &pins->next, pins = rtnl_dereference(*ins))
1075 if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1076 break;
1077
1078 RCU_INIT_POINTER(n->next, pins);
1079 rcu_assign_pointer(*ins, n);
1080 *arg = n;
1081 return 0;
1082 }
1083
1084 errhw:
1085 #ifdef CONFIG_CLS_U32_MARK
1086 free_percpu(n->pcpu_success);
1087 #endif
1088
1089 errout:
1090 tcf_exts_destroy(&n->exts);
1091 #ifdef CONFIG_CLS_U32_PERF
1092 free_percpu(n->pf);
1093 #endif
1094 kfree(n);
1095 return err;
1096 }
1097
1098 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1099 {
1100 struct tc_u_common *tp_c = tp->data;
1101 struct tc_u_hnode *ht;
1102 struct tc_u_knode *n;
1103 unsigned int h;
1104
1105 if (arg->stop)
1106 return;
1107
1108 for (ht = rtnl_dereference(tp_c->hlist);
1109 ht;
1110 ht = rtnl_dereference(ht->next)) {
1111 if (ht->prio != tp->prio)
1112 continue;
1113 if (arg->count >= arg->skip) {
1114 if (arg->fn(tp, ht, arg) < 0) {
1115 arg->stop = 1;
1116 return;
1117 }
1118 }
1119 arg->count++;
1120 for (h = 0; h <= ht->divisor; h++) {
1121 for (n = rtnl_dereference(ht->ht[h]);
1122 n;
1123 n = rtnl_dereference(n->next)) {
1124 if (arg->count < arg->skip) {
1125 arg->count++;
1126 continue;
1127 }
1128 if (arg->fn(tp, n, arg) < 0) {
1129 arg->stop = 1;
1130 return;
1131 }
1132 arg->count++;
1133 }
1134 }
1135 }
1136 }
1137
1138 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1139 {
1140 struct tc_u_knode *n = fh;
1141
1142 if (n && n->res.classid == classid)
1143 n->res.class = cl;
1144 }
1145
1146 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1147 struct sk_buff *skb, struct tcmsg *t)
1148 {
1149 struct tc_u_knode *n = fh;
1150 struct tc_u_hnode *ht_up, *ht_down;
1151 struct nlattr *nest;
1152
1153 if (n == NULL)
1154 return skb->len;
1155
1156 t->tcm_handle = n->handle;
1157
1158 nest = nla_nest_start(skb, TCA_OPTIONS);
1159 if (nest == NULL)
1160 goto nla_put_failure;
1161
1162 if (TC_U32_KEY(n->handle) == 0) {
1163 struct tc_u_hnode *ht = fh;
1164 u32 divisor = ht->divisor + 1;
1165
1166 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1167 goto nla_put_failure;
1168 } else {
1169 #ifdef CONFIG_CLS_U32_PERF
1170 struct tc_u32_pcnt *gpf;
1171 int cpu;
1172 #endif
1173
1174 if (nla_put(skb, TCA_U32_SEL,
1175 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1176 &n->sel))
1177 goto nla_put_failure;
1178
1179 ht_up = rtnl_dereference(n->ht_up);
1180 if (ht_up) {
1181 u32 htid = n->handle & 0xFFFFF000;
1182 if (nla_put_u32(skb, TCA_U32_HASH, htid))
1183 goto nla_put_failure;
1184 }
1185 if (n->res.classid &&
1186 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1187 goto nla_put_failure;
1188
1189 ht_down = rtnl_dereference(n->ht_down);
1190 if (ht_down &&
1191 nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1192 goto nla_put_failure;
1193
1194 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1195 goto nla_put_failure;
1196
1197 #ifdef CONFIG_CLS_U32_MARK
1198 if ((n->val || n->mask)) {
1199 struct tc_u32_mark mark = {.val = n->val,
1200 .mask = n->mask,
1201 .success = 0};
1202 int cpum;
1203
1204 for_each_possible_cpu(cpum) {
1205 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1206
1207 mark.success += cnt;
1208 }
1209
1210 if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1211 goto nla_put_failure;
1212 }
1213 #endif
1214
1215 if (tcf_exts_dump(skb, &n->exts) < 0)
1216 goto nla_put_failure;
1217
1218 #ifdef CONFIG_NET_CLS_IND
1219 if (n->ifindex) {
1220 struct net_device *dev;
1221 dev = __dev_get_by_index(net, n->ifindex);
1222 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1223 goto nla_put_failure;
1224 }
1225 #endif
1226 #ifdef CONFIG_CLS_U32_PERF
1227 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1228 n->sel.nkeys * sizeof(u64),
1229 GFP_KERNEL);
1230 if (!gpf)
1231 goto nla_put_failure;
1232
1233 for_each_possible_cpu(cpu) {
1234 int i;
1235 struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1236
1237 gpf->rcnt += pf->rcnt;
1238 gpf->rhit += pf->rhit;
1239 for (i = 0; i < n->sel.nkeys; i++)
1240 gpf->kcnts[i] += pf->kcnts[i];
1241 }
1242
1243 if (nla_put_64bit(skb, TCA_U32_PCNT,
1244 sizeof(struct tc_u32_pcnt) +
1245 n->sel.nkeys * sizeof(u64),
1246 gpf, TCA_U32_PAD)) {
1247 kfree(gpf);
1248 goto nla_put_failure;
1249 }
1250 kfree(gpf);
1251 #endif
1252 }
1253
1254 nla_nest_end(skb, nest);
1255
1256 if (TC_U32_KEY(n->handle))
1257 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1258 goto nla_put_failure;
1259 return skb->len;
1260
1261 nla_put_failure:
1262 nla_nest_cancel(skb, nest);
1263 return -1;
1264 }
1265
1266 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1267 .kind = "u32",
1268 .classify = u32_classify,
1269 .init = u32_init,
1270 .destroy = u32_destroy,
1271 .get = u32_get,
1272 .change = u32_change,
1273 .delete = u32_delete,
1274 .walk = u32_walk,
1275 .dump = u32_dump,
1276 .bind_class = u32_bind_class,
1277 .owner = THIS_MODULE,
1278 };
1279
1280 static int __init init_u32(void)
1281 {
1282 int i, ret;
1283
1284 pr_info("u32 classifier\n");
1285 #ifdef CONFIG_CLS_U32_PERF
1286 pr_info(" Performance counters on\n");
1287 #endif
1288 #ifdef CONFIG_NET_CLS_IND
1289 pr_info(" input device check on\n");
1290 #endif
1291 #ifdef CONFIG_NET_CLS_ACT
1292 pr_info(" Actions configured\n");
1293 #endif
1294 tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1295 sizeof(struct hlist_head),
1296 GFP_KERNEL);
1297 if (!tc_u_common_hash)
1298 return -ENOMEM;
1299
1300 for (i = 0; i < U32_HASH_SIZE; i++)
1301 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1302
1303 ret = register_tcf_proto_ops(&cls_u32_ops);
1304 if (ret)
1305 kvfree(tc_u_common_hash);
1306 return ret;
1307 }
1308
1309 static void __exit exit_u32(void)
1310 {
1311 unregister_tcf_proto_ops(&cls_u32_ops);
1312 kvfree(tc_u_common_hash);
1313 }
1314
1315 module_init(init_u32)
1316 module_exit(exit_u32)
1317 MODULE_LICENSE("GPL");
ubuntu-bionic-kernel mirror