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drm: Use srcu to protect drm_device.unplugged
[linux/fpc-iii.git] / net / sched / cls_u32.c
blob6c7601a530e35489d38de939264a854209399676
1 /*
2 * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * The filters are packed to hash tables of key nodes
12 * with a set of 32bit key/mask pairs at every node.
13 * Nodes reference next level hash tables etc.
14 *
15 * This scheme is the best universal classifier I managed to
16 * invent; it is not super-fast, but it is not slow (provided you
17 * program it correctly), and general enough. And its relative
18 * speed grows as the number of rules becomes larger.
19 *
20 * It seems that it represents the best middle point between
21 * speed and manageability both by human and by machine.
22 *
23 * It is especially useful for link sharing combined with QoS;
24 * pure RSVP doesn't need such a general approach and can use
25 * much simpler (and faster) schemes, sort of cls_rsvp.c.
26 *
27 * JHS: We should remove the CONFIG_NET_CLS_IND from here
28 * eventually when the meta match extension is made available
29 *
30 * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
31 */
32
33 #include <linux/module.h>
34 #include <linux/slab.h>
35 #include <linux/types.h>
36 #include <linux/kernel.h>
37 #include <linux/string.h>
38 #include <linux/errno.h>
39 #include <linux/percpu.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/skbuff.h>
42 #include <linux/bitmap.h>
43 #include <linux/netdevice.h>
44 #include <linux/hash.h>
45 #include <net/netlink.h>
46 #include <net/act_api.h>
47 #include <net/pkt_cls.h>
48 #include <linux/idr.h>
49
50 struct tc_u_knode {
51 struct tc_u_knode __rcu *next;
52 u32 handle;
53 struct tc_u_hnode __rcu *ht_up;
54 struct tcf_exts exts;
55 #ifdef CONFIG_NET_CLS_IND
56 int ifindex;
57 #endif
58 u8 fshift;
59 struct tcf_result res;
60 struct tc_u_hnode __rcu *ht_down;
61 #ifdef CONFIG_CLS_U32_PERF
62 struct tc_u32_pcnt __percpu *pf;
63 #endif
64 u32 flags;
65 #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 idr handle_idr;
89 struct rcu_head rcu;
90 u32 flags;
91 /* The 'ht' field MUST be the last field in structure to allow for
92 * more entries allocated at end of structure.
93 */
94 struct tc_u_knode __rcu *ht[1];
95 };
96
97 struct tc_u_common {
98 struct tc_u_hnode __rcu *hlist;
99 struct tcf_block *block;
100 int refcnt;
101 struct idr handle_idr;
102 struct hlist_node hnode;
103 struct rcu_head rcu;
104 };
105
106 static inline unsigned int u32_hash_fold(__be32 key,
107 const struct tc_u32_sel *sel,
108 u8 fshift)
109 {
110 unsigned int h = ntohl(key & sel->hmask) >> fshift;
111
112 return h;
113 }
114
115 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
116 struct tcf_result *res)
117 {
118 struct {
119 struct tc_u_knode *knode;
120 unsigned int off;
121 } stack[TC_U32_MAXDEPTH];
122
123 struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
124 unsigned int off = skb_network_offset(skb);
125 struct tc_u_knode *n;
126 int sdepth = 0;
127 int off2 = 0;
128 int sel = 0;
129 #ifdef CONFIG_CLS_U32_PERF
130 int j;
131 #endif
132 int i, r;
133
134 next_ht:
135 n = rcu_dereference_bh(ht->ht[sel]);
136
137 next_knode:
138 if (n) {
139 struct tc_u32_key *key = n->sel.keys;
140
141 #ifdef CONFIG_CLS_U32_PERF
142 __this_cpu_inc(n->pf->rcnt);
143 j = 0;
144 #endif
145
146 if (tc_skip_sw(n->flags)) {
147 n = rcu_dereference_bh(n->next);
148 goto next_knode;
149 }
150
151 #ifdef CONFIG_CLS_U32_MARK
152 if ((skb->mark & n->mask) != n->val) {
153 n = rcu_dereference_bh(n->next);
154 goto next_knode;
155 } else {
156 __this_cpu_inc(*n->pcpu_success);
157 }
158 #endif
159
160 for (i = n->sel.nkeys; i > 0; i--, key++) {
161 int toff = off + key->off + (off2 & key->offmask);
162 __be32 *data, hdata;
163
164 if (skb_headroom(skb) + toff > INT_MAX)
165 goto out;
166
167 data = skb_header_pointer(skb, toff, 4, &hdata);
168 if (!data)
169 goto out;
170 if ((*data ^ key->val) & key->mask) {
171 n = rcu_dereference_bh(n->next);
172 goto next_knode;
173 }
174 #ifdef CONFIG_CLS_U32_PERF
175 __this_cpu_inc(n->pf->kcnts[j]);
176 j++;
177 #endif
178 }
179
180 ht = rcu_dereference_bh(n->ht_down);
181 if (!ht) {
182 check_terminal:
183 if (n->sel.flags & TC_U32_TERMINAL) {
184
185 *res = n->res;
186 #ifdef CONFIG_NET_CLS_IND
187 if (!tcf_match_indev(skb, n->ifindex)) {
188 n = rcu_dereference_bh(n->next);
189 goto next_knode;
190 }
191 #endif
192 #ifdef CONFIG_CLS_U32_PERF
193 __this_cpu_inc(n->pf->rhit);
194 #endif
195 r = tcf_exts_exec(skb, &n->exts, res);
196 if (r < 0) {
197 n = rcu_dereference_bh(n->next);
198 goto next_knode;
199 }
200
201 return r;
202 }
203 n = rcu_dereference_bh(n->next);
204 goto next_knode;
205 }
206
207 /* PUSH */
208 if (sdepth >= TC_U32_MAXDEPTH)
209 goto deadloop;
210 stack[sdepth].knode = n;
211 stack[sdepth].off = off;
212 sdepth++;
213
214 ht = rcu_dereference_bh(n->ht_down);
215 sel = 0;
216 if (ht->divisor) {
217 __be32 *data, hdata;
218
219 data = skb_header_pointer(skb, off + n->sel.hoff, 4,
220 &hdata);
221 if (!data)
222 goto out;
223 sel = ht->divisor & u32_hash_fold(*data, &n->sel,
224 n->fshift);
225 }
226 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
227 goto next_ht;
228
229 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
230 off2 = n->sel.off + 3;
231 if (n->sel.flags & TC_U32_VAROFFSET) {
232 __be16 *data, hdata;
233
234 data = skb_header_pointer(skb,
235 off + n->sel.offoff,
236 2, &hdata);
237 if (!data)
238 goto out;
239 off2 += ntohs(n->sel.offmask & *data) >>
240 n->sel.offshift;
241 }
242 off2 &= ~3;
243 }
244 if (n->sel.flags & TC_U32_EAT) {
245 off += off2;
246 off2 = 0;
247 }
248
249 if (off < skb->len)
250 goto next_ht;
251 }
252
253 /* POP */
254 if (sdepth--) {
255 n = stack[sdepth].knode;
256 ht = rcu_dereference_bh(n->ht_up);
257 off = stack[sdepth].off;
258 goto check_terminal;
259 }
260 out:
261 return -1;
262
263 deadloop:
264 net_warn_ratelimited("cls_u32: dead loop\n");
265 return -1;
266 }
267
268 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
269 {
270 struct tc_u_hnode *ht;
271
272 for (ht = rtnl_dereference(tp_c->hlist);
273 ht;
274 ht = rtnl_dereference(ht->next))
275 if (ht->handle == handle)
276 break;
277
278 return ht;
279 }
280
281 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
282 {
283 unsigned int sel;
284 struct tc_u_knode *n = NULL;
285
286 sel = TC_U32_HASH(handle);
287 if (sel > ht->divisor)
288 goto out;
289
290 for (n = rtnl_dereference(ht->ht[sel]);
291 n;
292 n = rtnl_dereference(n->next))
293 if (n->handle == handle)
294 break;
295 out:
296 return n;
297 }
298
299
300 static void *u32_get(struct tcf_proto *tp, u32 handle)
301 {
302 struct tc_u_hnode *ht;
303 struct tc_u_common *tp_c = tp->data;
304
305 if (TC_U32_HTID(handle) == TC_U32_ROOT)
306 ht = rtnl_dereference(tp->root);
307 else
308 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
309
310 if (!ht)
311 return NULL;
312
313 if (TC_U32_KEY(handle) == 0)
314 return ht;
315
316 return u32_lookup_key(ht, handle);
317 }
318
319 /* Protected by rtnl lock */
320 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
321 {
322 int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
323 if (id < 0)
324 return 0;
325 return (id | 0x800U) << 20;
326 }
327
328 static struct hlist_head *tc_u_common_hash;
329
330 #define U32_HASH_SHIFT 10
331 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
332
333 static unsigned int tc_u_hash(const struct tcf_proto *tp)
334 {
335 return hash_ptr(tp->chain->block, U32_HASH_SHIFT);
336 }
337
338 static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
339 {
340 struct tc_u_common *tc;
341 unsigned int h;
342
343 h = tc_u_hash(tp);
344 hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
345 if (tc->block == tp->chain->block)
346 return tc;
347 }
348 return NULL;
349 }
350
351 static int u32_init(struct tcf_proto *tp)
352 {
353 struct tc_u_hnode *root_ht;
354 struct tc_u_common *tp_c;
355 unsigned int h;
356
357 tp_c = tc_u_common_find(tp);
358
359 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
360 if (root_ht == NULL)
361 return -ENOBUFS;
362
363 root_ht->refcnt++;
364 root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
365 root_ht->prio = tp->prio;
366 idr_init(&root_ht->handle_idr);
367
368 if (tp_c == NULL) {
369 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
370 if (tp_c == NULL) {
371 kfree(root_ht);
372 return -ENOBUFS;
373 }
374 tp_c->block = tp->chain->block;
375 INIT_HLIST_NODE(&tp_c->hnode);
376 idr_init(&tp_c->handle_idr);
377
378 h = tc_u_hash(tp);
379 hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
380 }
381
382 tp_c->refcnt++;
383 RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
384 rcu_assign_pointer(tp_c->hlist, root_ht);
385 root_ht->tp_c = tp_c;
386
387 rcu_assign_pointer(tp->root, root_ht);
388 tp->data = tp_c;
389 return 0;
390 }
391
392 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
393 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 /* u32_delete_key_rcu should be called when free'ing a copied
414 * version of a tc_u_knode obtained from u32_init_knode(). When
415 * copies are obtained from u32_init_knode() the statistics are
416 * shared between the old and new copies to allow readers to
417 * continue to update the statistics during the copy. To support
418 * this the u32_delete_key_rcu variant does not free the percpu
419 * statistics.
420 */
421 static void u32_delete_key_work(struct work_struct *work)
422 {
423 struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
424
425 rtnl_lock();
426 u32_destroy_key(key->tp, key, false);
427 rtnl_unlock();
428 }
429
430 static void u32_delete_key_rcu(struct rcu_head *rcu)
431 {
432 struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
433
434 INIT_WORK(&key->work, u32_delete_key_work);
435 tcf_queue_work(&key->work);
436 }
437
438 /* u32_delete_key_freepf_rcu is the rcu callback variant
439 * that free's the entire structure including the statistics
440 * percpu variables. Only use this if the key is not a copy
441 * returned by u32_init_knode(). See u32_delete_key_rcu()
442 * for the variant that should be used with keys return from
443 * u32_init_knode()
444 */
445 static void u32_delete_key_freepf_work(struct work_struct *work)
446 {
447 struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);
448
449 rtnl_lock();
450 u32_destroy_key(key->tp, key, true);
451 rtnl_unlock();
452 }
453
454 static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
455 {
456 struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);
457
458 INIT_WORK(&key->work, u32_delete_key_freepf_work);
459 tcf_queue_work(&key->work);
460 }
461
462 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
463 {
464 struct tc_u_knode __rcu **kp;
465 struct tc_u_knode *pkp;
466 struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
467
468 if (ht) {
469 kp = &ht->ht[TC_U32_HASH(key->handle)];
470 for (pkp = rtnl_dereference(*kp); pkp;
471 kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
472 if (pkp == key) {
473 RCU_INIT_POINTER(*kp, key->next);
474
475 tcf_unbind_filter(tp, &key->res);
476 tcf_exts_get_net(&key->exts);
477 call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
478 return 0;
479 }
480 }
481 }
482 WARN_ON(1);
483 return 0;
484 }
485
486 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
487 struct netlink_ext_ack *extack)
488 {
489 struct tcf_block *block = tp->chain->block;
490 struct tc_cls_u32_offload cls_u32 = {};
491
492 tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack);
493 cls_u32.command = TC_CLSU32_DELETE_HNODE;
494 cls_u32.hnode.divisor = h->divisor;
495 cls_u32.hnode.handle = h->handle;
496 cls_u32.hnode.prio = h->prio;
497
498 tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
499 }
500
501 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
502 u32 flags, struct netlink_ext_ack *extack)
503 {
504 struct tcf_block *block = tp->chain->block;
505 struct tc_cls_u32_offload cls_u32 = {};
506 bool skip_sw = tc_skip_sw(flags);
507 bool offloaded = false;
508 int err;
509
510 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
511 cls_u32.command = TC_CLSU32_NEW_HNODE;
512 cls_u32.hnode.divisor = h->divisor;
513 cls_u32.hnode.handle = h->handle;
514 cls_u32.hnode.prio = h->prio;
515
516 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
517 if (err < 0) {
518 u32_clear_hw_hnode(tp, h, NULL);
519 return err;
520 } else if (err > 0) {
521 offloaded = true;
522 }
523
524 if (skip_sw && !offloaded)
525 return -EINVAL;
526
527 return 0;
528 }
529
530 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
531 struct netlink_ext_ack *extack)
532 {
533 struct tcf_block *block = tp->chain->block;
534 struct tc_cls_u32_offload cls_u32 = {};
535
536 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack);
537 cls_u32.command = TC_CLSU32_DELETE_KNODE;
538 cls_u32.knode.handle = n->handle;
539
540 tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false);
541 tcf_block_offload_dec(block, &n->flags);
542 }
543
544 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
545 u32 flags, struct netlink_ext_ack *extack)
546 {
547 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
548 struct tcf_block *block = tp->chain->block;
549 struct tc_cls_u32_offload cls_u32 = {};
550 bool skip_sw = tc_skip_sw(flags);
551 int err;
552
553 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack);
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 = ht->handle;
568
569 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw);
570 if (err < 0) {
571 u32_remove_hw_knode(tp, n, NULL);
572 return err;
573 } else if (err > 0) {
574 tcf_block_offload_inc(block, &n->flags);
575 }
576
577 if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW))
578 return -EINVAL;
579
580 return 0;
581 }
582
583 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
584 struct netlink_ext_ack *extack)
585 {
586 struct tc_u_knode *n;
587 unsigned int h;
588
589 for (h = 0; h <= ht->divisor; h++) {
590 while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
591 RCU_INIT_POINTER(ht->ht[h],
592 rtnl_dereference(n->next));
593 tcf_unbind_filter(tp, &n->res);
594 u32_remove_hw_knode(tp, n, extack);
595 idr_remove(&ht->handle_idr, n->handle);
596 if (tcf_exts_get_net(&n->exts))
597 call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
598 else
599 u32_destroy_key(n->tp, n, true);
600 }
601 }
602 }
603
604 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
605 struct netlink_ext_ack *extack)
606 {
607 struct tc_u_common *tp_c = tp->data;
608 struct tc_u_hnode __rcu **hn;
609 struct tc_u_hnode *phn;
610
611 WARN_ON(ht->refcnt);
612
613 u32_clear_hnode(tp, ht, extack);
614
615 hn = &tp_c->hlist;
616 for (phn = rtnl_dereference(*hn);
617 phn;
618 hn = &phn->next, phn = rtnl_dereference(*hn)) {
619 if (phn == ht) {
620 u32_clear_hw_hnode(tp, ht, extack);
621 idr_destroy(&ht->handle_idr);
622 idr_remove(&tp_c->handle_idr, ht->handle);
623 RCU_INIT_POINTER(*hn, ht->next);
624 kfree_rcu(ht, rcu);
625 return 0;
626 }
627 }
628
629 return -ENOENT;
630 }
631
632 static bool ht_empty(struct tc_u_hnode *ht)
633 {
634 unsigned int h;
635
636 for (h = 0; h <= ht->divisor; h++)
637 if (rcu_access_pointer(ht->ht[h]))
638 return false;
639
640 return true;
641 }
642
643 static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
644 {
645 struct tc_u_common *tp_c = tp->data;
646 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
647
648 WARN_ON(root_ht == NULL);
649
650 if (root_ht && --root_ht->refcnt == 0)
651 u32_destroy_hnode(tp, root_ht, extack);
652
653 if (--tp_c->refcnt == 0) {
654 struct tc_u_hnode *ht;
655
656 hlist_del(&tp_c->hnode);
657
658 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) {
659 u32_clear_hnode(tp, ht, extack);
660 RCU_INIT_POINTER(tp_c->hlist, ht->next);
661
662 /* u32_destroy_key() will later free ht for us, if it's
663 * still referenced by some knode
664 */
665 if (--ht->refcnt == 0)
666 kfree_rcu(ht, rcu);
667 }
668
669 idr_destroy(&tp_c->handle_idr);
670 kfree(tp_c);
671 }
672
673 tp->data = NULL;
674 }
675
676 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
677 struct netlink_ext_ack *extack)
678 {
679 struct tc_u_hnode *ht = arg;
680 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
681 struct tc_u_common *tp_c = tp->data;
682 int ret = 0;
683
684 if (ht == NULL)
685 goto out;
686
687 if (TC_U32_KEY(ht->handle)) {
688 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack);
689 ret = u32_delete_key(tp, (struct tc_u_knode *)ht);
690 goto out;
691 }
692
693 if (root_ht == ht) {
694 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
695 return -EINVAL;
696 }
697
698 if (ht->refcnt == 1) {
699 ht->refcnt--;
700 u32_destroy_hnode(tp, ht, extack);
701 } else {
702 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter");
703 return -EBUSY;
704 }
705
706 out:
707 *last = true;
708 if (root_ht) {
709 if (root_ht->refcnt > 1) {
710 *last = false;
711 goto ret;
712 }
713 if (root_ht->refcnt == 1) {
714 if (!ht_empty(root_ht)) {
715 *last = false;
716 goto ret;
717 }
718 }
719 }
720
721 if (tp_c->refcnt > 1) {
722 *last = false;
723 goto ret;
724 }
725
726 if (tp_c->refcnt == 1) {
727 struct tc_u_hnode *ht;
728
729 for (ht = rtnl_dereference(tp_c->hlist);
730 ht;
731 ht = rtnl_dereference(ht->next))
732 if (!ht_empty(ht)) {
733 *last = false;
734 break;
735 }
736 }
737
738 ret:
739 return ret;
740 }
741
742 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid)
743 {
744 u32 index = htid | 0x800;
745 u32 max = htid | 0xFFF;
746
747 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) {
748 index = htid + 1;
749 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max,
750 GFP_KERNEL))
751 index = max;
752 }
753
754 return index;
755 }
756
757 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
758 [TCA_U32_CLASSID] = { .type = NLA_U32 },
759 [TCA_U32_HASH] = { .type = NLA_U32 },
760 [TCA_U32_LINK] = { .type = NLA_U32 },
761 [TCA_U32_DIVISOR] = { .type = NLA_U32 },
762 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) },
763 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
764 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) },
765 [TCA_U32_FLAGS] = { .type = NLA_U32 },
766 };
767
768 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
769 unsigned long base, struct tc_u_hnode *ht,
770 struct tc_u_knode *n, struct nlattr **tb,
771 struct nlattr *est, bool ovr,
772 struct netlink_ext_ack *extack)
773 {
774 int err;
775
776 err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
777 if (err < 0)
778 return err;
779
780 if (tb[TCA_U32_LINK]) {
781 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
782 struct tc_u_hnode *ht_down = NULL, *ht_old;
783
784 if (TC_U32_KEY(handle)) {
785 NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table");
786 return -EINVAL;
787 }
788
789 if (handle) {
790 ht_down = u32_lookup_ht(ht->tp_c, handle);
791
792 if (!ht_down) {
793 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
794 return -EINVAL;
795 }
796 ht_down->refcnt++;
797 }
798
799 ht_old = rtnl_dereference(n->ht_down);
800 rcu_assign_pointer(n->ht_down, ht_down);
801
802 if (ht_old)
803 ht_old->refcnt--;
804 }
805 if (tb[TCA_U32_CLASSID]) {
806 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
807 tcf_bind_filter(tp, &n->res, base);
808 }
809
810 #ifdef CONFIG_NET_CLS_IND
811 if (tb[TCA_U32_INDEV]) {
812 int ret;
813 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
814 if (ret < 0)
815 return -EINVAL;
816 n->ifindex = ret;
817 }
818 #endif
819 return 0;
820 }
821
822 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c,
823 struct tc_u_knode *n)
824 {
825 struct tc_u_knode __rcu **ins;
826 struct tc_u_knode *pins;
827 struct tc_u_hnode *ht;
828
829 if (TC_U32_HTID(n->handle) == TC_U32_ROOT)
830 ht = rtnl_dereference(tp->root);
831 else
832 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle));
833
834 ins = &ht->ht[TC_U32_HASH(n->handle)];
835
836 /* The node must always exist for it to be replaced if this is not the
837 * case then something went very wrong elsewhere.
838 */
839 for (pins = rtnl_dereference(*ins); ;
840 ins = &pins->next, pins = rtnl_dereference(*ins))
841 if (pins->handle == n->handle)
842 break;
843
844 idr_replace(&ht->handle_idr, n, n->handle);
845 RCU_INIT_POINTER(n->next, pins->next);
846 rcu_assign_pointer(*ins, n);
847 }
848
849 static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp,
850 struct tc_u_knode *n)
851 {
852 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down);
853 struct tc_u32_sel *s = &n->sel;
854 struct tc_u_knode *new;
855
856 new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
857 GFP_KERNEL);
858
859 if (!new)
860 return NULL;
861
862 RCU_INIT_POINTER(new->next, n->next);
863 new->handle = n->handle;
864 RCU_INIT_POINTER(new->ht_up, n->ht_up);
865
866 #ifdef CONFIG_NET_CLS_IND
867 new->ifindex = n->ifindex;
868 #endif
869 new->fshift = n->fshift;
870 new->res = n->res;
871 new->flags = n->flags;
872 RCU_INIT_POINTER(new->ht_down, ht);
873
874 /* bump reference count as long as we hold pointer to structure */
875 if (ht)
876 ht->refcnt++;
877
878 #ifdef CONFIG_CLS_U32_PERF
879 /* Statistics may be incremented by readers during update
880 * so we must keep them in tact. When the node is later destroyed
881 * a special destroy call must be made to not free the pf memory.
882 */
883 new->pf = n->pf;
884 #endif
885
886 #ifdef CONFIG_CLS_U32_MARK
887 new->val = n->val;
888 new->mask = n->mask;
889 /* Similarly success statistics must be moved as pointers */
890 new->pcpu_success = n->pcpu_success;
891 #endif
892 new->tp = tp;
893 memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
894
895 if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) {
896 kfree(new);
897 return NULL;
898 }
899
900 return new;
901 }
902
903 static int u32_change(struct net *net, struct sk_buff *in_skb,
904 struct tcf_proto *tp, unsigned long base, u32 handle,
905 struct nlattr **tca, void **arg, bool ovr,
906 struct netlink_ext_ack *extack)
907 {
908 struct tc_u_common *tp_c = tp->data;
909 struct tc_u_hnode *ht;
910 struct tc_u_knode *n;
911 struct tc_u32_sel *s;
912 struct nlattr *opt = tca[TCA_OPTIONS];
913 struct nlattr *tb[TCA_U32_MAX + 1];
914 u32 htid, flags = 0;
915 int err;
916 #ifdef CONFIG_CLS_U32_PERF
917 size_t size;
918 #endif
919
920 if (!opt) {
921 if (handle) {
922 NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options");
923 return -EINVAL;
924 } else {
925 return 0;
926 }
927 }
928
929 err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack);
930 if (err < 0)
931 return err;
932
933 if (tb[TCA_U32_FLAGS]) {
934 flags = nla_get_u32(tb[TCA_U32_FLAGS]);
935 if (!tc_flags_valid(flags)) {
936 NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags");
937 return -EINVAL;
938 }
939 }
940
941 n = *arg;
942 if (n) {
943 struct tc_u_knode *new;
944
945 if (TC_U32_KEY(n->handle) == 0) {
946 NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero");
947 return -EINVAL;
948 }
949
950 if ((n->flags ^ flags) &
951 ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) {
952 NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags");
953 return -EINVAL;
954 }
955
956 new = u32_init_knode(tp, n);
957 if (!new)
958 return -ENOMEM;
959
960 err = u32_set_parms(net, tp, base,
961 rtnl_dereference(n->ht_up), new, tb,
962 tca[TCA_RATE], ovr, extack);
963
964 if (err) {
965 u32_destroy_key(tp, new, false);
966 return err;
967 }
968
969 err = u32_replace_hw_knode(tp, new, flags, extack);
970 if (err) {
971 u32_destroy_key(tp, new, false);
972 return err;
973 }
974
975 if (!tc_in_hw(new->flags))
976 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
977
978 u32_replace_knode(tp, tp_c, new);
979 tcf_unbind_filter(tp, &n->res);
980 tcf_exts_get_net(&n->exts);
981 call_rcu(&n->rcu, u32_delete_key_rcu);
982 return 0;
983 }
984
985 if (tb[TCA_U32_DIVISOR]) {
986 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
987
988 if (--divisor > 0x100) {
989 NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets");
990 return -EINVAL;
991 }
992 if (TC_U32_KEY(handle)) {
993 NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table");
994 return -EINVAL;
995 }
996 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);
997 if (ht == NULL)
998 return -ENOBUFS;
999 if (handle == 0) {
1000 handle = gen_new_htid(tp->data, ht);
1001 if (handle == 0) {
1002 kfree(ht);
1003 return -ENOMEM;
1004 }
1005 } else {
1006 err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle,
1007 handle, GFP_KERNEL);
1008 if (err) {
1009 kfree(ht);
1010 return err;
1011 }
1012 }
1013 ht->tp_c = tp_c;
1014 ht->refcnt = 1;
1015 ht->divisor = divisor;
1016 ht->handle = handle;
1017 ht->prio = tp->prio;
1018 idr_init(&ht->handle_idr);
1019 ht->flags = flags;
1020
1021 err = u32_replace_hw_hnode(tp, ht, flags, extack);
1022 if (err) {
1023 idr_remove(&tp_c->handle_idr, handle);
1024 kfree(ht);
1025 return err;
1026 }
1027
1028 RCU_INIT_POINTER(ht->next, tp_c->hlist);
1029 rcu_assign_pointer(tp_c->hlist, ht);
1030 *arg = ht;
1031
1032 return 0;
1033 }
1034
1035 if (tb[TCA_U32_HASH]) {
1036 htid = nla_get_u32(tb[TCA_U32_HASH]);
1037 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
1038 ht = rtnl_dereference(tp->root);
1039 htid = ht->handle;
1040 } else {
1041 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
1042 if (!ht) {
1043 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found");
1044 return -EINVAL;
1045 }
1046 }
1047 } else {
1048 ht = rtnl_dereference(tp->root);
1049 htid = ht->handle;
1050 }
1051
1052 if (ht->divisor < TC_U32_HASH(htid)) {
1053 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value");
1054 return -EINVAL;
1055 }
1056
1057 if (handle) {
1058 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
1059 NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
1060 return -EINVAL;
1061 }
1062 handle = htid | TC_U32_NODE(handle);
1063 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
1064 GFP_KERNEL);
1065 if (err)
1066 return err;
1067 } else
1068 handle = gen_new_kid(ht, htid);
1069
1070 if (tb[TCA_U32_SEL] == NULL) {
1071 NL_SET_ERR_MSG_MOD(extack, "Selector not specified");
1072 err = -EINVAL;
1073 goto erridr;
1074 }
1075
1076 s = nla_data(tb[TCA_U32_SEL]);
1077
1078 n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
1079 if (n == NULL) {
1080 err = -ENOBUFS;
1081 goto erridr;
1082 }
1083
1084 #ifdef CONFIG_CLS_U32_PERF
1085 size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64);
1086 n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt));
1087 if (!n->pf) {
1088 err = -ENOBUFS;
1089 goto errfree;
1090 }
1091 #endif
1092
1093 memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
1094 RCU_INIT_POINTER(n->ht_up, ht);
1095 n->handle = handle;
1096 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
1097 n->flags = flags;
1098 n->tp = tp;
1099
1100 err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE);
1101 if (err < 0)
1102 goto errout;
1103
1104 #ifdef CONFIG_CLS_U32_MARK
1105 n->pcpu_success = alloc_percpu(u32);
1106 if (!n->pcpu_success) {
1107 err = -ENOMEM;
1108 goto errout;
1109 }
1110
1111 if (tb[TCA_U32_MARK]) {
1112 struct tc_u32_mark *mark;
1113
1114 mark = nla_data(tb[TCA_U32_MARK]);
1115 n->val = mark->val;
1116 n->mask = mark->mask;
1117 }
1118 #endif
1119
1120 err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
1121 extack);
1122 if (err == 0) {
1123 struct tc_u_knode __rcu **ins;
1124 struct tc_u_knode *pins;
1125
1126 err = u32_replace_hw_knode(tp, n, flags, extack);
1127 if (err)
1128 goto errhw;
1129
1130 if (!tc_in_hw(n->flags))
1131 n->flags |= TCA_CLS_FLAGS_NOT_IN_HW;
1132
1133 ins = &ht->ht[TC_U32_HASH(handle)];
1134 for (pins = rtnl_dereference(*ins); pins;
1135 ins = &pins->next, pins = rtnl_dereference(*ins))
1136 if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle))
1137 break;
1138
1139 RCU_INIT_POINTER(n->next, pins);
1140 rcu_assign_pointer(*ins, n);
1141 *arg = n;
1142 return 0;
1143 }
1144
1145 errhw:
1146 #ifdef CONFIG_CLS_U32_MARK
1147 free_percpu(n->pcpu_success);
1148 #endif
1149
1150 errout:
1151 tcf_exts_destroy(&n->exts);
1152 #ifdef CONFIG_CLS_U32_PERF
1153 errfree:
1154 free_percpu(n->pf);
1155 #endif
1156 kfree(n);
1157 erridr:
1158 idr_remove(&ht->handle_idr, handle);
1159 return err;
1160 }
1161
1162 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
1163 {
1164 struct tc_u_common *tp_c = tp->data;
1165 struct tc_u_hnode *ht;
1166 struct tc_u_knode *n;
1167 unsigned int h;
1168
1169 if (arg->stop)
1170 return;
1171
1172 for (ht = rtnl_dereference(tp_c->hlist);
1173 ht;
1174 ht = rtnl_dereference(ht->next)) {
1175 if (ht->prio != tp->prio)
1176 continue;
1177 if (arg->count >= arg->skip) {
1178 if (arg->fn(tp, ht, arg) < 0) {
1179 arg->stop = 1;
1180 return;
1181 }
1182 }
1183 arg->count++;
1184 for (h = 0; h <= ht->divisor; h++) {
1185 for (n = rtnl_dereference(ht->ht[h]);
1186 n;
1187 n = rtnl_dereference(n->next)) {
1188 if (arg->count < arg->skip) {
1189 arg->count++;
1190 continue;
1191 }
1192 if (arg->fn(tp, n, arg) < 0) {
1193 arg->stop = 1;
1194 return;
1195 }
1196 arg->count++;
1197 }
1198 }
1199 }
1200 }
1201
1202 static void u32_bind_class(void *fh, u32 classid, unsigned long cl)
1203 {
1204 struct tc_u_knode *n = fh;
1205
1206 if (n && n->res.classid == classid)
1207 n->res.class = cl;
1208 }
1209
1210 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh,
1211 struct sk_buff *skb, struct tcmsg *t)
1212 {
1213 struct tc_u_knode *n = fh;
1214 struct tc_u_hnode *ht_up, *ht_down;
1215 struct nlattr *nest;
1216
1217 if (n == NULL)
1218 return skb->len;
1219
1220 t->tcm_handle = n->handle;
1221
1222 nest = nla_nest_start(skb, TCA_OPTIONS);
1223 if (nest == NULL)
1224 goto nla_put_failure;
1225
1226 if (TC_U32_KEY(n->handle) == 0) {
1227 struct tc_u_hnode *ht = fh;
1228 u32 divisor = ht->divisor + 1;
1229
1230 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor))
1231 goto nla_put_failure;
1232 } else {
1233 #ifdef CONFIG_CLS_U32_PERF
1234 struct tc_u32_pcnt *gpf;
1235 int cpu;
1236 #endif
1237
1238 if (nla_put(skb, TCA_U32_SEL,
1239 sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
1240 &n->sel))
1241 goto nla_put_failure;
1242
1243 ht_up = rtnl_dereference(n->ht_up);
1244 if (ht_up) {
1245 u32 htid = n->handle & 0xFFFFF000;
1246 if (nla_put_u32(skb, TCA_U32_HASH, htid))
1247 goto nla_put_failure;
1248 }
1249 if (n->res.classid &&
1250 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid))
1251 goto nla_put_failure;
1252
1253 ht_down = rtnl_dereference(n->ht_down);
1254 if (ht_down &&
1255 nla_put_u32(skb, TCA_U32_LINK, ht_down->handle))
1256 goto nla_put_failure;
1257
1258 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags))
1259 goto nla_put_failure;
1260
1261 #ifdef CONFIG_CLS_U32_MARK
1262 if ((n->val || n->mask)) {
1263 struct tc_u32_mark mark = {.val = n->val,
1264 .mask = n->mask,
1265 .success = 0};
1266 int cpum;
1267
1268 for_each_possible_cpu(cpum) {
1269 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum);
1270
1271 mark.success += cnt;
1272 }
1273
1274 if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark))
1275 goto nla_put_failure;
1276 }
1277 #endif
1278
1279 if (tcf_exts_dump(skb, &n->exts) < 0)
1280 goto nla_put_failure;
1281
1282 #ifdef CONFIG_NET_CLS_IND
1283 if (n->ifindex) {
1284 struct net_device *dev;
1285 dev = __dev_get_by_index(net, n->ifindex);
1286 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name))
1287 goto nla_put_failure;
1288 }
1289 #endif
1290 #ifdef CONFIG_CLS_U32_PERF
1291 gpf = kzalloc(sizeof(struct tc_u32_pcnt) +
1292 n->sel.nkeys * sizeof(u64),
1293 GFP_KERNEL);
1294 if (!gpf)
1295 goto nla_put_failure;
1296
1297 for_each_possible_cpu(cpu) {
1298 int i;
1299 struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu);
1300
1301 gpf->rcnt += pf->rcnt;
1302 gpf->rhit += pf->rhit;
1303 for (i = 0; i < n->sel.nkeys; i++)
1304 gpf->kcnts[i] += pf->kcnts[i];
1305 }
1306
1307 if (nla_put_64bit(skb, TCA_U32_PCNT,
1308 sizeof(struct tc_u32_pcnt) +
1309 n->sel.nkeys * sizeof(u64),
1310 gpf, TCA_U32_PAD)) {
1311 kfree(gpf);
1312 goto nla_put_failure;
1313 }
1314 kfree(gpf);
1315 #endif
1316 }
1317
1318 nla_nest_end(skb, nest);
1319
1320 if (TC_U32_KEY(n->handle))
1321 if (tcf_exts_dump_stats(skb, &n->exts) < 0)
1322 goto nla_put_failure;
1323 return skb->len;
1324
1325 nla_put_failure:
1326 nla_nest_cancel(skb, nest);
1327 return -1;
1328 }
1329
1330 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
1331 .kind = "u32",
1332 .classify = u32_classify,
1333 .init = u32_init,
1334 .destroy = u32_destroy,
1335 .get = u32_get,
1336 .change = u32_change,
1337 .delete = u32_delete,
1338 .walk = u32_walk,
1339 .dump = u32_dump,
1340 .bind_class = u32_bind_class,
1341 .owner = THIS_MODULE,
1342 };
1343
1344 static int __init init_u32(void)
1345 {
1346 int i, ret;
1347
1348 pr_info("u32 classifier\n");
1349 #ifdef CONFIG_CLS_U32_PERF
1350 pr_info(" Performance counters on\n");
1351 #endif
1352 #ifdef CONFIG_NET_CLS_IND
1353 pr_info(" input device check on\n");
1354 #endif
1355 #ifdef CONFIG_NET_CLS_ACT
1356 pr_info(" Actions configured\n");
1357 #endif
1358 tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
1359 sizeof(struct hlist_head),
1360 GFP_KERNEL);
1361 if (!tc_u_common_hash)
1362 return -ENOMEM;
1363
1364 for (i = 0; i < U32_HASH_SIZE; i++)
1365 INIT_HLIST_HEAD(&tc_u_common_hash[i]);
1366
1367 ret = register_tcf_proto_ops(&cls_u32_ops);
1368 if (ret)
1369 kvfree(tc_u_common_hash);
1370 return ret;
1371 }
1372
1373 static void __exit exit_u32(void)
1374 {
1375 unregister_tcf_proto_ops(&cls_u32_ops);
1376 kvfree(tc_u_common_hash);
1377 }
1378
1379 module_init(init_u32)
1380 module_exit(exit_u32)
1381 MODULE_LICENSE("GPL");
Linux with added FPC-III support