projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-4.7-dw' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
[deliverable/linux.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 <net/netlink.h>
44 #include <net/act_api.h>
45 #include <net/pkt_cls.h>
46 #include <linux/netdevice.h>
47
48 struct tc_u_knode {
49 struct tc_u_knode __rcu *next;
50 u32 handle;
51 struct tc_u_hnode __rcu *ht_up;
52 struct tcf_exts exts;
53 #ifdef CONFIG_NET_CLS_IND
54 int ifindex;
55 #endif
56 u8 fshift;
57 struct tcf_result res;
58 struct tc_u_hnode __rcu *ht_down;
59 #ifdef CONFIG_CLS_U32_PERF
60 struct tc_u32_pcnt __percpu *pf;
61 #endif
62 u32 flags;
63 #ifdef CONFIG_CLS_U32_MARK
64 u32 val;
65 u32 mask;
66 u32 __percpu *pcpu_success;
67 #endif
68 struct tcf_proto *tp;
69 struct rcu_head rcu;
70 /* The 'sel' field MUST be the last field in structure to allow for
71 * tc_u32_keys allocated at end of structure.
72 */
73 struct tc_u32_sel sel;
74 };
75
76 struct tc_u_hnode {
77 struct tc_u_hnode __rcu *next;
78 u32 handle;
79 u32 prio;
80 struct tc_u_common *tp_c;
81 int refcnt;
82 unsigned int divisor;
83 struct rcu_head rcu;
84 /* The 'ht' field MUST be the last field in structure to allow for
85 * more entries allocated at end of structure.
86 */
87 struct tc_u_knode __rcu *ht[1];
88 };
89
90 struct tc_u_common {
91 struct tc_u_hnode __rcu *hlist;
92 struct Qdisc *q;
93 int refcnt;
94 u32 hgenerator;
95 struct rcu_head rcu;
96 };
97
98 static 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
107 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
108 {
109 struct {
110 struct tc_u_knode *knode;
111 unsigned int off;
112 } stack[TC_U32_MAXDEPTH];
113
114 struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
115 unsigned int off = skb_network_offset(skb);
116 struct tc_u_knode *n;
117 int sdepth = 0;
118 int off2 = 0;
119 int sel = 0;
120 #ifdef CONFIG_CLS_U32_PERF
121 int j;
122 #endif
123 int i, r;
124
125 next_ht:
126 n = rcu_dereference_bh(ht->ht[sel]);
127
128 next_knode:
129 if (n) {
130 struct tc_u32_key *key = n->sel.keys;
131
132 #ifdef CONFIG_CLS_U32_PERF
133 __this_cpu_inc(n->pf->rcnt);
134 j = 0;
135 #endif
136
137 if (tc_skip_sw(n->flags)) {
138 n = rcu_dereference_bh(n->next);
139 goto next_knode;
140 }
141
142 #ifdef CONFIG_CLS_U32_MARK
143 if ((skb->mark & n->mask) != n->val) {
144 n = rcu_dereference_bh(n->next);
145 goto next_knode;
146 } else {
147 __this_cpu_inc(*n->pcpu_success);
148 }
149 #endif
150
151 for (i = n->sel.nkeys; i > 0; i--, key++) {
152 int toff = off + key->off + (off2 & key->offmask);
153 __be32 *data, hdata;
154
155 if (skb_headroom(skb) + toff > INT_MAX)
156 goto out;
157
158 data = skb_header_pointer(skb, toff, 4, &hdata);
159 if (!data)
160 goto out;
161 if ((*data ^ key->val) & key->mask) {
162 n = rcu_dereference_bh(n->next);
163 goto next_knode;
164 }
165 #ifdef CONFIG_CLS_U32_PERF
166 __this_cpu_inc(n->pf->kcnts[j]);
167 j++;
168 #endif
169 }
170
171 ht = rcu_dereference_bh(n->ht_down);
172 if (!ht) {
173 check_terminal:
174 if (n->sel.flags & TC_U32_TERMINAL) {
175
176 *res = n->res;
177 #ifdef CONFIG_NET_CLS_IND
178 if (!tcf_match_indev(skb, n->ifindex)) {
179 n = rcu_dereference_bh(n->next);
180 goto next_knode;
181 }
182 #endif
183 #ifdef CONFIG_CLS_U32_PERF
184 __this_cpu_inc(n->pf->rhit);
185 #endif
186 r = tcf_exts_exec(skb, &n->exts, res);
187 if (r < 0) {
188 n = rcu_dereference_bh(n->next);
189 goto next_knode;
190 }
191
192 return r;
193 }
194 n = rcu_dereference_bh(n->next);
195 goto next_knode;
196 }
197
198 /* PUSH */
199 if (sdepth >= TC_U32_MAXDEPTH)
200 goto deadloop;
201 stack[sdepth].knode = n;
202 stack[sdepth].off = off;
203 sdepth++;
204
205 ht = rcu_dereference_bh(n->ht_down);
206 sel = 0;
207 if (ht->divisor) {
208 __be32 *data, hdata;
209
210 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
211 &hdata);
212 if (!data)
213 goto out;
214 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
215 n->fshift);
216 }
217 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
218 goto next_ht;
219
220 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
221 off2 = n->sel.off + 3;
222 if (n->sel.flags & TC_U32_VAROFFSET) {
223 __be16 *data, hdata;
224
225 data = skb_header_pointer(skb,
226 off + n->sel.offoff,
227 2, &hdata);
228 if (!data)
229 goto out;
230 off2 += ntohs(n->sel.offmask & *data) >>
231 n->sel.offshift;
232 }
233 off2 &= ~3;
234 }
235 if (n->sel.flags & TC_U32_EAT) {
236 off += off2;
237 off2 = 0;
238 }
239
240 if (off < skb->len)
241 goto next_ht;
242 }
243
244 /* POP */
245 if (sdepth--) {
246 n = stack[sdepth].knode;
247 ht = rcu_dereference_bh(n->ht_up);
248 off = stack[sdepth].off;
249 goto check_terminal;
250 }
251 out:
252 return -1;
253
254 deadloop:
255 net_warn_ratelimited("cls_u32: dead loop\n");
256 return -1;
257 }
258
259 static struct tc_u_hnode *
260 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
261 {
262 struct tc_u_hnode *ht;
263
264 for (ht = rtnl_dereference(tp_c->hlist);
265 ht;
266 ht = rtnl_dereference(ht->next))
267 if (ht->handle == handle)
268 break;
269
270 return ht;
271 }
272
273 static struct tc_u_knode *
274 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
275 {
276 unsigned int sel;
277 struct tc_u_knode *n = NULL;
278
279 sel = TC_U32_HASH(handle);
280 if (sel > ht->divisor)
281 goto out;
282
283 for (n = rtnl_dereference(ht->ht[sel]);
284 n;
285 n = rtnl_dereference(n->next))
286 if (n->handle == handle)
287 break;
288 out:
289 return n;
290 }
291
292
293 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
294 {
295 struct tc_u_hnode *ht;
296 struct tc_u_common *tp_c = tp->data;
297
298 if (TC_U32_HTID(handle) == TC_U32_ROOT)
299 ht = rtnl_dereference(tp->root);
300 else
301 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
302
303 if (!ht)
304 return 0;
305
306 if (TC_U32_KEY(handle) == 0)
307 return (unsigned long)ht;
308
309 return (unsigned long)u32_lookup_key(ht, handle);
310 }
311
312 static u32 gen_new_htid(struct tc_u_common *tp_c)
313 {
314 int i = 0x800;
315
316 /* hgenerator only used inside rtnl lock it is safe to increment
317 * without read _copy_ update semantics
318 */
319 do {
320 if (++tp_c->hgenerator == 0x7FF)
321 tp_c->hgenerator = 1;
322 } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
323
324 return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
325 }
326
327 static int u32_init(struct tcf_proto *tp)
328 {
329 struct tc_u_hnode *root_ht;
330 struct tc_u_common *tp_c;
331
332 tp_c = tp->q->u32_node;
333
334 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
335 if (root_ht == NULL)
336 return -ENOBUFS;
337
338 root_ht->divisor = 0;
339 root_ht->refcnt++;
340 root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
341 root_ht->prio = tp->prio;
342
343 if (tp_c == NULL) {
344 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
345 if (tp_c == NULL) {
346 kfree(root_ht);
347 return -ENOBUFS;
348 }
349 tp_c->q = tp->q;
350 tp->q->u32_node = tp_c;
351 }
352
353 tp_c->refcnt++;
354 RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
355 rcu_assign_pointer(tp_c->hlist, root_ht);
356 root_ht->tp_c = tp_c;
357
358 rcu_assign_pointer(tp->root, root_ht);
359 tp->data = tp_c;
360 return 0;
361 }
362
363 static int u32_destroy_key(struct tcf_proto *tp,
364 struct tc_u_knode *n,
365 bool free_pf)
366 {
367 tcf_exts_destroy(&n->exts);
368 if (n->ht_down)
369 n->ht_down->refcnt--;
370 #ifdef CONFIG_CLS_U32_PERF
371 if (free_pf)
372 free_percpu(n->pf);
373 #endif
374 #ifdef CONFIG_CLS_U32_MARK
375 if (free_pf)
376 free_percpu(n->pcpu_success);
377 #endif
378 kfree(n);
379 return 0;
380 }
381
382 /* u32_delete_key_rcu should be called when free'ing a copied
383 * version of a tc_u_knode obtained from u32_init_knode(). When
384 * copies are obtained from u32_init_knode() the statistics are
385 * shared between the old and new copies to allow readers to
386 * continue to update the statistics during the copy. To support
387 * this the u32_delete_key_rcu variant does not free the percpu
388 * statistics.
389 */
390 static void u32_delete_key_rcu(struct rcu_head *rcu)
391 {
392 struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
393
394 u32_destroy_key(key->tp, key, false);
395 }
396
397 /* u32_delete_key_freepf_rcu is the rcu callback variant
398 * that free's the entire structure including the statistics
399 * percpu variables. Only use this if the key is not a copy
400 * returned by u32_init_knode(). See u32_delete_key_rcu()
401 * for the variant that should be used with keys return from
402 * u32_init_knode()
403 */
404 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
405 {
406 struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
407
408 u32_destroy_key(key->tp, key, true);
409 }
410
411 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
412 {
413 struct tc_u_knode __rcu **kp;
414 struct tc_u_knode *pkp;
415 struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
416
417 if (ht) {
418 kp = &ht->ht[TC_U32_HASH(key->handle)];
419 for (pkp = rtnl_dereference(*kp); pkp;
420 kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
421 if (pkp == key) {
422 RCU_INIT_POINTER(*kp, key->next);
423
424 tcf_unbind_filter(tp, &key->res);
425 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
426 return 0;
427 }
428 }
429 }
430 WARN_ON(1);
431 return 0;
432 }
433
434 static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle)
435 {
436 struct net_device *dev = tp->q->dev_queue->dev;
437 struct tc_cls_u32_offload u32_offload = {0};
438 struct tc_to_netdev offload;
439
440 offload.type = TC_SETUP_CLSU32;
441 offload.cls_u32 = &u32_offload;
442
443 if (tc_should_offload(dev, 0)) {
444 offload.cls_u32->command = TC_CLSU32_DELETE_KNODE;
445 offload.cls_u32->knode.handle = handle;
446 dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
447 tp->protocol, &offload);
448 }
449 }
450
451 static int u32_replace_hw_hnode(struct tcf_proto *tp,
452 struct tc_u_hnode *h,
453 u32 flags)
454 {
455 struct net_device *dev = tp->q->dev_queue->dev;
456 struct tc_cls_u32_offload u32_offload = {0};
457 struct tc_to_netdev offload;
458 int err;
459
460 offload.type = TC_SETUP_CLSU32;
461 offload.cls_u32 = &u32_offload;
462
463 if (tc_should_offload(dev, flags)) {
464 offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
465 offload.cls_u32->hnode.divisor = h->divisor;
466 offload.cls_u32->hnode.handle = h->handle;
467 offload.cls_u32->hnode.prio = h->prio;
468
469 err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
470 tp->protocol, &offload);
471 if (tc_skip_sw(flags))
472 return err;
473 }
474
475 return 0;
476 }
477
478 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h)
479 {
480 struct net_device *dev = tp->q->dev_queue->dev;
481 struct tc_cls_u32_offload u32_offload = {0};
482 struct tc_to_netdev offload;
483
484 offload.type = TC_SETUP_CLSU32;
485 offload.cls_u32 = &u32_offload;
486
487 if (tc_should_offload(dev, 0)) {
488 offload.cls_u32->command = TC_CLSU32_DELETE_HNODE;
489 offload.cls_u32->hnode.divisor = h->divisor;
490 offload.cls_u32->hnode.handle = h->handle;
491 offload.cls_u32->hnode.prio = h->prio;
492
493 dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
494 tp->protocol, &offload);
495 }
496 }
497
498 static int u32_replace_hw_knode(struct tcf_proto *tp,
499 struct tc_u_knode *n,
500 u32 flags)
501 {
502 struct net_device *dev = tp->q->dev_queue->dev;
503 struct tc_cls_u32_offload u32_offload = {0};
504 struct tc_to_netdev offload;
505 int err;
506
507 offload.type = TC_SETUP_CLSU32;
508 offload.cls_u32 = &u32_offload;
509
510 if (tc_should_offload(dev, flags)) {
511 offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE;
512 offload.cls_u32->knode.handle = n->handle;
513 offload.cls_u32->knode.fshift = n->fshift;
514 #ifdef CONFIG_CLS_U32_MARK
515 offload.cls_u32->knode.val = n->val;
516 offload.cls_u32->knode.mask = n->mask;
517 #else
518 offload.cls_u32->knode.val = 0;
519 offload.cls_u32->knode.mask = 0;
520 #endif
521 offload.cls_u32->knode.sel = &n->sel;
522 offload.cls_u32->knode.exts = &n->exts;
523 if (n->ht_down)
524 offload.cls_u32->knode.link_handle = n->ht_down->handle;
525
526 err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
527 tp->protocol, &offload);
528 if (tc_skip_sw(flags))
529 return err;
530 }
531
532 return 0;
533 }
534
535 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
536 {
537 struct tc_u_knode *n;
538 unsigned int h;
539
540 for (h = 0; h <= ht->divisor; h++) {
541 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
542 RCU_INIT_POINTER(ht->ht[h],
543 rtnl_dereference(n->next));
544 tcf_unbind_filter(tp, &n->res);
545 u32_remove_hw_knode(tp, n->handle);
546 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
547 }
548 }
549 }
550
551 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
552 {
553 struct tc_u_common *tp_c = tp->data;
554 struct tc_u_hnode __rcu **hn;
555 struct tc_u_hnode *phn;
556
557 WARN_ON(ht->refcnt);
558
559 u32_clear_hnode(tp, ht);
560
561 hn = &tp_c->hlist;
562 for (phn = rtnl_dereference(*hn);
563 phn;
564 hn = &phn->next, phn = rtnl_dereference(*hn)) {
565 if (phn == ht) {
566 u32_clear_hw_hnode(tp, ht);
567 RCU_INIT_POINTER(*hn, ht->next);
568 kfree_rcu(ht, rcu);
569 return 0;
570 }
571 }
572
573 return -ENOENT;
574 }
575
576 static bool ht_empty(struct tc_u_hnode *ht)
577 {
578 unsigned int h;
579
580 for (h = 0; h <= ht->divisor; h++)
581 if (rcu_access_pointer(ht->ht[h]))
582 return false;
583
584 return true;
585 }
586
587 static bool u32_destroy(struct tcf_proto *tp, bool force)
588 {
589 struct tc_u_common *tp_c = tp->data;
590 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
591
592 WARN_ON(root_ht == NULL);
593
594 if (!force) {
595 if (root_ht) {
596 if (root_ht->refcnt > 1)
597 return false;
598 if (root_ht->refcnt == 1) {
599 if (!ht_empty(root_ht))
600 return false;
601 }
602 }
603
604 if (tp_c->refcnt > 1)
605 return false;
606
607 if (tp_c->refcnt == 1) {
608 struct tc_u_hnode *ht;
609
610 for (ht = rtnl_dereference(tp_c->hlist);
611 ht;
612 ht = rtnl_dereference(ht->next))
613 if (!ht_empty(ht))
614 return false;
615 }
616 }
617
618 if (root_ht && --root_ht->refcnt == 0)
619 u32_destroy_hnode(tp, root_ht);
620
621 if (--tp_c->refcnt == 0) {
622 struct tc_u_hnode *ht;
623
624 tp->q->u32_node = NULL;
625
626 for (ht = rtnl_dereference(tp_c->hlist);
627 ht;
628 ht = rtnl_dereference(ht->next)) {
629 ht->refcnt--;
630 u32_clear_hnode(tp, ht);
631 }
632
633 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
634 RCU_INIT_POINTER(tp_c->hlist, ht->next);
635 kfree_rcu(ht, rcu);
636 }
637
638 kfree(tp_c);
639 }
640
641 tp->data = NULL;
642 return true;
643 }
644
645 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
646 {
647 struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
648 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
649
650 if (ht == NULL)
651 return 0;
652
653 if (TC_U32_KEY(ht->handle)) {
654 u32_remove_hw_knode(tp, ht->handle);
655 return u32_delete_key(tp, (struct tc_u_knode *)ht);
656 }
657
658 if (root_ht == ht)
659 return -EINVAL;
660
661 if (ht->refcnt == 1) {
662 ht->refcnt--;
663 u32_destroy_hnode(tp, ht);
664 } else {
665 return -EBUSY;
666 }
667
668 return 0;
669 }
670
671 #define NR_U32_NODE (1<<12)
672 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
673 {
674 struct tc_u_knode *n;
675 unsigned long i;
676 unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long),
677 GFP_KERNEL);
678 if (!bitmap)
679 return handle | 0xFFF;
680
681 for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]);
682 n;
683 n = rtnl_dereference(n->next))
684 set_bit(TC_U32_NODE(n->handle), bitmap);
685
686 i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800);
687 if (i >= NR_U32_NODE)
688 i = find_next_zero_bit(bitmap, NR_U32_NODE, 1);
689
690 kfree(bitmap);
691 return handle | (i >= NR_U32_NODE ? 0xFFF : i);
692 }
693
694 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
695 [TCA_U32_CLASSID] = { .type = NLA_U32 },
696 [TCA_U32_HASH] = { .type = NLA_U32 },
697 [TCA_U32_LINK] = { .type = NLA_U32 },
698 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
699 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
700 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
701 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
702 [TCA_U32_FLAGS] = { .type = NLA_U32 },
703 };
704
705 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
706 unsigned long base, struct tc_u_hnode *ht,
707 struct tc_u_knode *n, struct nlattr **tb,
708 struct nlattr *est, bool ovr)
709 {
710 int err;
711 struct tcf_exts e;
712
713 tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE);
714 err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
715 if (err < 0)
716 return err;
717
718 err = -EINVAL;
719 if (tb[TCA_U32_LINK]) {
720 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
721 struct tc_u_hnode *ht_down = NULL, *ht_old;
722
723 if (TC_U32_KEY(handle))
724 goto errout;
725
726 if (handle) {
727 ht_down = u32_lookup_ht(ht->tp_c, handle);
728
729 if (ht_down == NULL)
730 goto errout;
731 ht_down->refcnt++;
732 }
733
734 ht_old = rtnl_dereference(n->ht_down);
735 rcu_assign_pointer(n->ht_down, ht_down);
736
737 if (ht_old)
738 ht_old->refcnt--;
739 }
740 if (tb[TCA_U32_CLASSID]) {
741 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
742 tcf_bind_filter(tp, &n->res, base);
743 }
744
745 #ifdef CONFIG_NET_CLS_IND
746 if (tb[TCA_U32_INDEV]) {
747 int ret;
748 ret = tcf_change_indev(net, tb[TCA_U32_INDEV]);
749 if (ret < 0)
750 goto errout;
751 n->ifindex = ret;
752 }
753 #endif
754 tcf_exts_change(tp, &n->exts, &e);
755
756 return 0;
757 errout:
758 tcf_exts_destroy(&e);
759 return err;
760 }
761
762 static void u32_replace_knode(struct tcf_proto *tp,
763 struct tc_u_common *tp_c,
764 struct tc_u_knode *n)
765 {
766 struct tc_u_knode __rcu **ins;
767 struct tc_u_knode *pins;
768 struct tc_u_hnode *ht;
769
770 if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
771 ht = rtnl_dereference(tp->root);
772 else
773 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
774
775 ins = &ht->ht[TC_U32_HASH(n->handle)];
776
777 /* The node must always exist for it to be replaced if this is not the
778 * case then something went very wrong elsewhere.
779 */
780 for (pins = rtnl_dereference(*ins); ;
781 ins = &pins->next, pins = rtnl_dereference(*ins))
782 if (pins->handle == n->handle)
783 break;
784
785 RCU_INIT_POINTER(n->next, pins->next);
786 rcu_assign_pointer(*ins, n);
787 }
788
789 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
790 struct tc_u_knode *n)
791 {
792 struct tc_u_knode *new;
793 struct tc_u32_sel *s = &n->sel;
794
795 new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
796 GFP_KERNEL);
797
798 if (!new)
799 return NULL;
800
801 RCU_INIT_POINTER(new->next, n->next);
802 new->handle = n->handle;
803 RCU_INIT_POINTER(new->ht_up, n->ht_up);
804
805 #ifdef CONFIG_NET_CLS_IND
806 new->ifindex = n->ifindex;
807 #endif
808 new->fshift = n->fshift;
809 new->res = n->res;
810 new->flags = n->flags;
811 RCU_INIT_POINTER(new->ht_down, n->ht_down);
812
813 /* bump reference count as long as we hold pointer to structure */
814 if (new->ht_down)
815 new->ht_down->refcnt++;
816
817 #ifdef CONFIG_CLS_U32_PERF
818 /* Statistics may be incremented by readers during update
819 * so we must keep them in tact. When the node is later destroyed
820 * a special destroy call must be made to not free the pf memory.
821 */
822 new->pf = n->pf;
823 #endif
824
825 #ifdef CONFIG_CLS_U32_MARK
826 new->val = n->val;
827 new->mask = n->mask;
828 /* Similarly success statistics must be moved as pointers */
829 new->pcpu_success = n->pcpu_success;
830 #endif
831 new->tp = tp;
832 memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
833
834 tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE);
835
836 return new;
837 }
838
839 static int u32_change(struct net *net, struct sk_buff *in_skb,
840 struct tcf_proto *tp, unsigned long base, u32 handle,
841 struct nlattr **tca,
842 unsigned long *arg, bool ovr)
843 {
844 struct tc_u_common *tp_c = tp->data;
845 struct tc_u_hnode *ht;
846 struct tc_u_knode *n;
847 struct tc_u32_sel *s;
848 struct nlattr *opt = tca[TCA_OPTIONS];
849 struct nlattr *tb[TCA_U32_MAX + 1];
850 u32 htid, flags = 0;
851 int err;
852 #ifdef CONFIG_CLS_U32_PERF
853 size_t size;
854 #endif
855
856 if (opt == NULL)
857 return handle ? -EINVAL : 0;
858
859 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
860 if (err < 0)
861 return err;
862
863 if (tb[TCA_U32_FLAGS]) {
864 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
865 if (!tc_flags_valid(flags))
866 return err;
867 }
868
869 n = (struct tc_u_knode *)*arg;
870 if (n) {
871 struct tc_u_knode *new;
872
873 if (TC_U32_KEY(n->handle) == 0)
874 return -EINVAL;
875
876 if (n->flags != flags)
877 return -EINVAL;
878
879 new = u32_init_knode(tp, n);
880 if (!new)
881 return -ENOMEM;
882
883 err = u32_set_parms(net, tp, base,
884 rtnl_dereference(n->ht_up), new, tb,
885 tca[TCA_RATE], ovr);
886
887 if (err) {
888 u32_destroy_key(tp, new, false);
889 return err;
890 }
891
892 err = u32_replace_hw_knode(tp, new, flags);
893 if (err) {
894 u32_destroy_key(tp, new, false);
895 return err;
896 }
897
898 u32_replace_knode(tp, tp_c, new);
899 tcf_unbind_filter(tp, &n->res);
900 call_rcu(&n->rcu, u32_delete_key_rcu);
901 return 0;
902 }
903
904 if (tb[TCA_U32_DIVISOR]) {
905 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
906
907 if (--divisor > 0x100)
908 return -EINVAL;
909 if (TC_U32_KEY(handle))
910 return -EINVAL;
911 if (handle == 0) {
912 handle = gen_new_htid(tp->data);
913 if (handle == 0)
914 return -ENOMEM;
915 }
916 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
917 if (ht == NULL)
918 return -ENOBUFS;
919 ht->tp_c = tp_c;
920 ht->refcnt = 1;
921 ht->divisor = divisor;
922 ht->handle = handle;
923 ht->prio = tp->prio;
924 RCU_INIT_POINTER(ht->next, tp_c->hlist);
925 rcu_assign_pointer(tp_c->hlist, ht);
926 *arg = (unsigned long)ht;
927
928 u32_replace_hw_hnode(tp, ht, flags);
929 return 0;
930 }
931
932 if (tb[TCA_U32_HASH]) {
933 htid = nla_get_u32(tb[TCA_U32_HASH]);
934 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
935 ht = rtnl_dereference(tp->root);
936 htid = ht->handle;
937 } else {
938 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
939 if (ht == NULL)
940 return -EINVAL;
941 }
942 } else {
943 ht = rtnl_dereference(tp->root);
944 htid = ht->handle;
945 }
946
947 if (ht->divisor < TC_U32_HASH(htid))
948 return -EINVAL;
949
950 if (handle) {
951 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
952 return -EINVAL;
953 handle = htid | TC_U32_NODE(handle);
954 } else
955 handle = gen_new_kid(ht, htid);
956
957 if (tb[TCA_U32_SEL] == NULL)
958 return -EINVAL;
959
960 s = nla_data(tb[TCA_U32_SEL]);
961
962 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
963 if (n == NULL)
964 return -ENOBUFS;
965
966 #ifdef CONFIG_CLS_U32_PERF
967 size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
968 n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
969 if (!n->pf) {
970 kfree(n);
971 return -ENOBUFS;
972 }
973 #endif
974
975 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
976 RCU_INIT_POINTER(n->ht_up, ht);
977 n->handle = handle;
978 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
979 n->flags = flags;
980 tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
981 n->tp = tp;
982
983 #ifdef CONFIG_CLS_U32_MARK
984 n->pcpu_success = alloc_percpu(u32);
985 if (!n->pcpu_success) {
986 err = -ENOMEM;
987 goto errout;
988 }
989
990 if (tb[TCA_U32_MARK]) {
991 struct tc_u32_mark *mark;
992
993 mark = nla_data(tb[TCA_U32_MARK]);
994 n->val = mark->val;
995 n->mask = mark->mask;
996 }
997 #endif
998
999 err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
1000 if (err == 0) {
1001 struct tc_u_knode __rcu **ins;
1002 struct tc_u_knode *pins;
1003
1004 err = u32_replace_hw_knode(tp, n, flags);
1005 if (err)
1006 goto errhw;
1007
1008 ins = &ht->ht[TC_U32_HASH(handle)];
1009 for (pins = rtnl_dereference(*ins); pins;
1010 ins = &pins->next, pins = rtnl_dereference(*ins))
1011 if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1012 break;
1013
1014 RCU_INIT_POINTER(n->next, pins);
1015 rcu_assign_pointer(*ins, n);
1016 *arg = (unsigned long)n;
1017 return 0;
1018 }
1019
1020 errhw:
1021 #ifdef CONFIG_CLS_U32_MARK
1022 free_percpu(n->pcpu_success);
1023 errout:
1024 #endif
1025
1026 #ifdef CONFIG_CLS_U32_PERF
1027 free_percpu(n->pf);
1028 #endif
1029 kfree(n);
1030 return err;
1031 }
1032
1033 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1034 {
1035 struct tc_u_common *tp_c = tp->data;
1036 struct tc_u_hnode *ht;
1037 struct tc_u_knode *n;
1038 unsigned int h;
1039
1040 if (arg->stop)
1041 return;
1042
1043 for (ht = rtnl_dereference(tp_c->hlist);
1044 ht;
1045 ht = rtnl_dereference(ht->next)) {
1046 if (ht->prio != tp->prio)
1047 continue;
1048 if (arg->count >= arg->skip) {
1049 if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
1050 arg->stop = 1;
1051 return;
1052 }
1053 }
1054 arg->count++;
1055 for (h = 0; h <= ht->divisor; h++) {
1056 for (n = rtnl_dereference(ht->ht[h]);
1057 n;
1058 n = rtnl_dereference(n->next)) {
1059 if (arg->count < arg->skip) {
1060 arg->count++;
1061 continue;
1062 }
1063 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
1064 arg->stop = 1;
1065 return;
1066 }
1067 arg->count++;
1068 }
1069 }
1070 }
1071 }
1072
1073 static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
1074 struct sk_buff *skb, struct tcmsg *t)
1075 {
1076 struct tc_u_knode *n = (struct tc_u_knode *)fh;
1077 struct tc_u_hnode *ht_up, *ht_down;
1078 struct nlattr *nest;
1079
1080 if (n == NULL)
1081 return skb->len;
1082
1083 t->tcm_handle = n->handle;
1084
1085 nest = nla_nest_start(skb, TCA_OPTIONS);
1086 if (nest == NULL)
1087 goto nla_put_failure;
1088
1089 if (TC_U32_KEY(n->handle) == 0) {
1090 struct tc_u_hnode *ht = (struct tc_u_hnode *)fh;
1091 u32 divisor = ht->divisor + 1;
1092
1093 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1094 goto nla_put_failure;
1095 } else {
1096 #ifdef CONFIG_CLS_U32_PERF
1097 struct tc_u32_pcnt *gpf;
1098 int cpu;
1099 #endif
1100
1101 if (nla_put(skb, TCA_U32_SEL,
1102 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1103 &n->sel))
1104 goto nla_put_failure;
1105
1106 ht_up = rtnl_dereference(n->ht_up);
1107 if (ht_up) {
1108 u32 htid = n->handle & 0xFFFFF000;
1109 if (nla_put_u32(skb, TCA_U32_HASH, htid))
1110 goto nla_put_failure;
1111 }
1112 if (n->res.classid &&
1113 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1114 goto nla_put_failure;
1115
1116 ht_down = rtnl_dereference(n->ht_down);
1117 if (ht_down &&
1118 nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1119 goto nla_put_failure;
1120
1121 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1122 goto nla_put_failure;
1123
1124 #ifdef CONFIG_CLS_U32_MARK
1125 if ((n->val || n->mask)) {
1126 struct tc_u32_mark mark = {.val = n->val,
1127 .mask = n->mask,
1128 .success = 0};
1129 int cpum;
1130
1131 for_each_possible_cpu(cpum) {
1132 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1133
1134 mark.success += cnt;
1135 }
1136
1137 if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1138 goto nla_put_failure;
1139 }
1140 #endif
1141
1142 if (tcf_exts_dump(skb, &n->exts) < 0)
1143 goto nla_put_failure;
1144
1145 #ifdef CONFIG_NET_CLS_IND
1146 if (n->ifindex) {
1147 struct net_device *dev;
1148 dev = __dev_get_by_index(net, n->ifindex);
1149 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1150 goto nla_put_failure;
1151 }
1152 #endif
1153 #ifdef CONFIG_CLS_U32_PERF
1154 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1155 n->sel.nkeys * sizeof(u64),
1156 GFP_KERNEL);
1157 if (!gpf)
1158 goto nla_put_failure;
1159
1160 for_each_possible_cpu(cpu) {
1161 int i;
1162 struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1163
1164 gpf->rcnt += pf->rcnt;
1165 gpf->rhit += pf->rhit;
1166 for (i = 0; i < n->sel.nkeys; i++)
1167 gpf->kcnts[i] += pf->kcnts[i];
1168 }
1169
1170 if (nla_put_64bit(skb, TCA_U32_PCNT,
1171 sizeof(struct tc_u32_pcnt) +
1172 n->sel.nkeys * sizeof(u64),
1173 gpf, TCA_U32_PAD)) {
1174 kfree(gpf);
1175 goto nla_put_failure;
1176 }
1177 kfree(gpf);
1178 #endif
1179 }
1180
1181 nla_nest_end(skb, nest);
1182
1183 if (TC_U32_KEY(n->handle))
1184 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1185 goto nla_put_failure;
1186 return skb->len;
1187
1188 nla_put_failure:
1189 nla_nest_cancel(skb, nest);
1190 return -1;
1191 }
1192
1193 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1194 .kind = "u32",
1195 .classify = u32_classify,
1196 .init = u32_init,
1197 .destroy = u32_destroy,
1198 .get = u32_get,
1199 .change = u32_change,
1200 .delete = u32_delete,
1201 .walk = u32_walk,
1202 .dump = u32_dump,
1203 .owner = THIS_MODULE,
1204 };
1205
1206 static int __init init_u32(void)
1207 {
1208 pr_info("u32 classifier\n");
1209 #ifdef CONFIG_CLS_U32_PERF
1210 pr_info(" Performance counters on\n");
1211 #endif
1212 #ifdef CONFIG_NET_CLS_IND
1213 pr_info(" input device check on\n");
1214 #endif
1215 #ifdef CONFIG_NET_CLS_ACT
1216 pr_info(" Actions configured\n");
1217 #endif
1218 return register_tcf_proto_ops(&cls_u32_ops);
1219 }
1220
1221 static void __exit exit_u32(void)
1222 {
1223 unregister_tcf_proto_ops(&cls_u32_ops);
1224 }
1225
1226 module_init(init_u32)
1227 module_exit(exit_u32)
1228 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.058843 seconds and 5 git commands to generate.