summaryrefslogtreecommitdiffstats
path: root/net/sched/cls_flower.c
blob: f6f40fba599bad3d1db4bb14fcc4f7d663d128bc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
/*
 * net/sched/cls_flower.c		Flower classifier
 *
 * Copyright (c) 2015 Jiri Pirko <jiri@resnulli.us>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/rhashtable.h>

#include <linux/if_ether.h>
#include <linux/in6.h>
#include <linux/ip.h>

#include <net/sch_generic.h>
#include <net/pkt_cls.h>
#include <net/ip.h>
#include <net/flow_dissector.h>

#include <net/dst.h>
#include <net/dst_metadata.h>

struct fl_flow_key {
	int	indev_ifindex;
	struct flow_dissector_key_control control;
	struct flow_dissector_key_control enc_control;
	struct flow_dissector_key_basic basic;
	struct flow_dissector_key_eth_addrs eth;
	struct flow_dissector_key_vlan vlan;
	union {
		struct flow_dissector_key_ipv4_addrs ipv4;
		struct flow_dissector_key_ipv6_addrs ipv6;
	};
	struct flow_dissector_key_ports tp;
	struct flow_dissector_key_keyid enc_key_id;
	union {
		struct flow_dissector_key_ipv4_addrs enc_ipv4;
		struct flow_dissector_key_ipv6_addrs enc_ipv6;
	};
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */

struct fl_flow_mask_range {
	unsigned short int start;
	unsigned short int end;
};

struct fl_flow_mask {
	struct fl_flow_key key;
	struct fl_flow_mask_range range;
	struct rcu_head	rcu;
};

struct cls_fl_head {
	struct rhashtable ht;
	struct fl_flow_mask mask;
	struct flow_dissector dissector;
	u32 hgen;
	bool mask_assigned;
	struct list_head filters;
	struct rhashtable_params ht_params;
	struct rcu_head rcu;
};

struct cls_fl_filter {
	struct rhash_head ht_node;
	struct fl_flow_key mkey;
	struct tcf_exts exts;
	struct tcf_result res;
	struct fl_flow_key key;
	struct list_head list;
	u32 handle;
	u32 flags;
	struct rcu_head	rcu;
};

static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
{
	return mask->range.end - mask->range.start;
}

static void fl_mask_update_range(struct fl_flow_mask *mask)
{
	const u8 *bytes = (const u8 *) &mask->key;
	size_t size = sizeof(mask->key);
	size_t i, first = 0, last = size - 1;

	for (i = 0; i < sizeof(mask->key); i++) {
		if (bytes[i]) {
			if (!first && i)
				first = i;
			last = i;
		}
	}
	mask->range.start = rounddown(first, sizeof(long));
	mask->range.end = roundup(last + 1, sizeof(long));
}

static void *fl_key_get_start(struct fl_flow_key *key,
			      const struct fl_flow_mask *mask)
{
	return (u8 *) key + mask->range.start;
}

static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
			      struct fl_flow_mask *mask)
{
	const long *lkey = fl_key_get_start(key, mask);
	const long *lmask = fl_key_get_start(&mask->key, mask);
	long *lmkey = fl_key_get_start(mkey, mask);
	int i;

	for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
		*lmkey++ = *lkey++ & *lmask++;
}

static void fl_clear_masked_range(struct fl_flow_key *key,
				  struct fl_flow_mask *mask)
{
	memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
}

static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
		       struct tcf_result *res)
{
	struct cls_fl_head *head = rcu_dereference_bh(tp->root);
	struct cls_fl_filter *f;
	struct fl_flow_key skb_key;
	struct fl_flow_key skb_mkey;
	struct ip_tunnel_info *info;

	if (!atomic_read(&head->ht.nelems))
		return -1;

	fl_clear_masked_range(&skb_key, &head->mask);

	info = skb_tunnel_info(skb);
	if (info) {
		struct ip_tunnel_key *key = &info->key;

		switch (ip_tunnel_info_af(info)) {
		case AF_INET:
			skb_key.enc_ipv4.src = key->u.ipv4.src;
			skb_key.enc_ipv4.dst = key->u.ipv4.dst;
			break;
		case AF_INET6:
			skb_key.enc_ipv6.src = key->u.ipv6.src;
			skb_key.enc_ipv6.dst = key->u.ipv6.dst;
			break;
		}

		skb_key.enc_key_id.keyid = tunnel_id_to_key32(key->tun_id);
	}

	skb_key.indev_ifindex = skb->skb_iif;
	/* skb_flow_dissect() does not set n_proto in case an unknown protocol,
	 * so do it rather here.
	 */
	skb_key.basic.n_proto = skb->protocol;
	skb_flow_dissect(skb, &head->dissector, &skb_key, 0);

	fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);

	f = rhashtable_lookup_fast(&head->ht,
				   fl_key_get_start(&skb_mkey, &head->mask),
				   head->ht_params);
	if (f && !tc_skip_sw(f->flags)) {
		*res = f->res;
		return tcf_exts_exec(skb, &f->exts, res);
	}
	return -1;
}

static int fl_init(struct tcf_proto *tp)
{
	struct cls_fl_head *head;

	head = kzalloc(sizeof(*head), GFP_KERNEL);
	if (!head)
		return -ENOBUFS;

	INIT_LIST_HEAD_RCU(&head->filters);
	rcu_assign_pointer(tp->root, head);

	return 0;
}

static void fl_destroy_filter(struct rcu_head *head)
{
	struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);

	tcf_exts_destroy(&f->exts);
	kfree(f);
}

static void fl_hw_destroy_filter(struct tcf_proto *tp, unsigned long cookie)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_flower_offload offload = {0};
	struct tc_to_netdev tc;

	if (!tc_should_offload(dev, tp, 0))
		return;

	offload.command = TC_CLSFLOWER_DESTROY;
	offload.cookie = cookie;

	tc.type = TC_SETUP_CLSFLOWER;
	tc.cls_flower = &offload;

	dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
}

static int fl_hw_replace_filter(struct tcf_proto *tp,
				struct flow_dissector *dissector,
				struct fl_flow_key *mask,
				struct fl_flow_key *key,
				struct tcf_exts *actions,
				unsigned long cookie, u32 flags)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_flower_offload offload = {0};
	struct tc_to_netdev tc;
	int err;

	if (!tc_should_offload(dev, tp, flags))
		return tc_skip_sw(flags) ? -EINVAL : 0;

	offload.command = TC_CLSFLOWER_REPLACE;
	offload.cookie = cookie;
	offload.dissector = dissector;
	offload.mask = mask;
	offload.key = key;
	offload.exts = actions;

	tc.type = TC_SETUP_CLSFLOWER;
	tc.cls_flower = &offload;

	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol,
					    &tc);

	if (tc_skip_sw(flags))
		return err;

	return 0;
}

static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_flower_offload offload = {0};
	struct tc_to_netdev tc;

	if (!tc_should_offload(dev, tp, 0))
		return;

	offload.command = TC_CLSFLOWER_STATS;
	offload.cookie = (unsigned long)f;
	offload.exts = &f->exts;

	tc.type = TC_SETUP_CLSFLOWER;
	tc.cls_flower = &offload;

	dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
}

static bool fl_destroy(struct tcf_proto *tp, bool force)
{
	struct cls_fl_head *head = rtnl_dereference(tp->root);
	struct cls_fl_filter *f, *next;

	if (!force && !list_empty(&head->filters))
		return false;

	list_for_each_entry_safe(f, next, &head->filters, list) {
		fl_hw_destroy_filter(tp, (unsigned long)f);
		list_del_rcu(&f->list);
		call_rcu(&f->rcu, fl_destroy_filter);
	}
	RCU_INIT_POINTER(tp->root, NULL);
	if (head->mask_assigned)
		rhashtable_destroy(&head->ht);
	kfree_rcu(head, rcu);
	return true;
}

static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
{
	struct cls_fl_head *head = rtnl_dereference(tp->root);
	struct cls_fl_filter *f;

	list_for_each_entry(f, &head->filters, list)
		if (f->handle == handle)
			return (unsigned long) f;
	return 0;
}

static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
	[TCA_FLOWER_UNSPEC]		= { .type = NLA_UNSPEC },
	[TCA_FLOWER_CLASSID]		= { .type = NLA_U32 },
	[TCA_FLOWER_INDEV]		= { .type = NLA_STRING,
					    .len = IFNAMSIZ },
	[TCA_FLOWER_KEY_ETH_DST]	= { .len = ETH_ALEN },
	[TCA_FLOWER_KEY_ETH_DST_MASK]	= { .len = ETH_ALEN },
	[TCA_FLOWER_KEY_ETH_SRC]	= { .len = ETH_ALEN },
	[TCA_FLOWER_KEY_ETH_SRC_MASK]	= { .len = ETH_ALEN },
	[TCA_FLOWER_KEY_ETH_TYPE]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_IP_PROTO]	= { .type = NLA_U8 },
	[TCA_FLOWER_KEY_IPV4_SRC]	= { .type = NLA_U32 },
	[TCA_FLOWER_KEY_IPV4_SRC_MASK]	= { .type = NLA_U32 },
	[TCA_FLOWER_KEY_IPV4_DST]	= { .type = NLA_U32 },
	[TCA_FLOWER_KEY_IPV4_DST_MASK]	= { .type = NLA_U32 },
	[TCA_FLOWER_KEY_IPV6_SRC]	= { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_IPV6_SRC_MASK]	= { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_IPV6_DST]	= { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_IPV6_DST_MASK]	= { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_TCP_SRC]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_TCP_DST]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_UDP_SRC]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_UDP_DST]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_VLAN_ID]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_VLAN_PRIO]	= { .type = NLA_U8 },
	[TCA_FLOWER_KEY_VLAN_ETH_TYPE]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_ENC_KEY_ID]	= { .type = NLA_U32 },
	[TCA_FLOWER_KEY_ENC_IPV4_SRC]	= { .type = NLA_U32 },
	[TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK] = { .type = NLA_U32 },
	[TCA_FLOWER_KEY_ENC_IPV4_DST]	= { .type = NLA_U32 },
	[TCA_FLOWER_KEY_ENC_IPV4_DST_MASK] = { .type = NLA_U32 },
	[TCA_FLOWER_KEY_ENC_IPV6_SRC]	= { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_ENC_IPV6_DST]	= { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_ENC_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
	[TCA_FLOWER_KEY_TCP_SRC_MASK]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_TCP_DST_MASK]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_UDP_SRC_MASK]	= { .type = NLA_U16 },
	[TCA_FLOWER_KEY_UDP_DST_MASK]	= { .type = NLA_U16 },
};

static void fl_set_key_val(struct nlattr **tb,
			   void *val, int val_type,
			   void *mask, int mask_type, int len)
{
	if (!tb[val_type])
		return;
	memcpy(val, nla_data(tb[val_type]), len);
	if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
		memset(mask, 0xff, len);
	else
		memcpy(mask, nla_data(tb[mask_type]), len);
}

static void fl_set_key_vlan(struct nlattr **tb,
			    struct flow_dissector_key_vlan *key_val,
			    struct flow_dissector_key_vlan *key_mask)
{
#define VLAN_PRIORITY_MASK	0x7

	if (tb[TCA_FLOWER_KEY_VLAN_ID]) {
		key_val->vlan_id =
			nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK;
		key_mask->vlan_id = VLAN_VID_MASK;
	}
	if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) {
		key_val->vlan_priority =
			nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) &
			VLAN_PRIORITY_MASK;
		key_mask->vlan_priority = VLAN_PRIORITY_MASK;
	}
}

static int fl_set_key(struct net *net, struct nlattr **tb,
		      struct fl_flow_key *key, struct fl_flow_key *mask)
{
	__be16 ethertype;
#ifdef CONFIG_NET_CLS_IND
	if (tb[TCA_FLOWER_INDEV]) {
		int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
		if (err < 0)
			return err;
		key->indev_ifindex = err;
		mask->indev_ifindex = 0xffffffff;
	}
#endif

	fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
		       mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
		       sizeof(key->eth.dst));
	fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
		       mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
		       sizeof(key->eth.src));

	if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
		ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);

		if (ethertype == htons(ETH_P_8021Q)) {
			fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
			fl_set_key_val(tb, &key->basic.n_proto,
				       TCA_FLOWER_KEY_VLAN_ETH_TYPE,
				       &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
				       sizeof(key->basic.n_proto));
		} else {
			key->basic.n_proto = ethertype;
			mask->basic.n_proto = cpu_to_be16(~0);
		}
	}

	if (key->basic.n_proto == htons(ETH_P_IP) ||
	    key->basic.n_proto == htons(ETH_P_IPV6)) {
		fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
			       &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
			       sizeof(key->basic.ip_proto));
	}

	if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
		key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
		fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
			       &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
			       sizeof(key->ipv4.src));
		fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
			       &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
			       sizeof(key->ipv4.dst));
	} else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
		key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
		fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
			       &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
			       sizeof(key->ipv6.src));
		fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
			       &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
			       sizeof(key->ipv6.dst));
	}

	if (key->basic.ip_proto == IPPROTO_TCP) {
		fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
			       &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
			       sizeof(key->tp.src));
		fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
			       &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
			       sizeof(key->tp.dst));
	} else if (key->basic.ip_proto == IPPROTO_UDP) {
		fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
			       &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
			       sizeof(key->tp.src));
		fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
			       &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
			       sizeof(key->tp.dst));
	}

	if (tb[TCA_FLOWER_KEY_ENC_IPV4_SRC] ||
	    tb[TCA_FLOWER_KEY_ENC_IPV4_DST]) {
		key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
		fl_set_key_val(tb, &key->enc_ipv4.src,
			       TCA_FLOWER_KEY_ENC_IPV4_SRC,
			       &mask->enc_ipv4.src,
			       TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
			       sizeof(key->enc_ipv4.src));
		fl_set_key_val(tb, &key->enc_ipv4.dst,
			       TCA_FLOWER_KEY_ENC_IPV4_DST,
			       &mask->enc_ipv4.dst,
			       TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
			       sizeof(key->enc_ipv4.dst));
	}

	if (tb[TCA_FLOWER_KEY_ENC_IPV6_SRC] ||
	    tb[TCA_FLOWER_KEY_ENC_IPV6_DST]) {
		key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
		fl_set_key_val(tb, &key->enc_ipv6.src,
			       TCA_FLOWER_KEY_ENC_IPV6_SRC,
			       &mask->enc_ipv6.src,
			       TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
			       sizeof(key->enc_ipv6.src));
		fl_set_key_val(tb, &key->enc_ipv6.dst,
			       TCA_FLOWER_KEY_ENC_IPV6_DST,
			       &mask->enc_ipv6.dst,
			       TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
			       sizeof(key->enc_ipv6.dst));
	}

	fl_set_key_val(tb, &key->enc_key_id.keyid, TCA_FLOWER_KEY_ENC_KEY_ID,
		       &mask->enc_key_id.keyid, TCA_FLOWER_UNSPEC,
		       sizeof(key->enc_key_id.keyid));

	return 0;
}

static bool fl_mask_eq(struct fl_flow_mask *mask1,
		       struct fl_flow_mask *mask2)
{
	const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
	const long *lmask2 = fl_key_get_start(&mask2->key, mask2);

	return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
	       !memcmp(lmask1, lmask2, fl_mask_range(mask1));
}

static const struct rhashtable_params fl_ht_params = {
	.key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
	.head_offset = offsetof(struct cls_fl_filter, ht_node),
	.automatic_shrinking = true,
};

static int fl_init_hashtable(struct cls_fl_head *head,
			     struct fl_flow_mask *mask)
{
	head->ht_params = fl_ht_params;
	head->ht_params.key_len = fl_mask_range(mask);
	head->ht_params.key_offset += mask->range.start;

	return rhashtable_init(&head->ht, &head->ht_params);
}

#define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
#define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))

#define FL_KEY_IS_MASKED(mask, member)						\
	memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member),		\
		   0, FL_KEY_MEMBER_SIZE(member))				\

#define FL_KEY_SET(keys, cnt, id, member)					\
	do {									\
		keys[cnt].key_id = id;						\
		keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member);		\
		cnt++;								\
	} while(0);

#define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member)			\
	do {									\
		if (FL_KEY_IS_MASKED(mask, member))				\
			FL_KEY_SET(keys, cnt, id, member);			\
	} while(0);

static void fl_init_dissector(struct cls_fl_head *head,
			      struct fl_flow_mask *mask)
{
	struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
	size_t cnt = 0;

	FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
	FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
			     FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
			     FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
			     FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
			     FLOW_DISSECTOR_KEY_PORTS, tp);
	FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
			     FLOW_DISSECTOR_KEY_VLAN, vlan);

	skb_flow_dissector_init(&head->dissector, keys, cnt);
}

static int fl_check_assign_mask(struct cls_fl_head *head,
				struct fl_flow_mask *mask)
{
	int err;

	if (head->mask_assigned) {
		if (!fl_mask_eq(&head->mask, mask))
			return -EINVAL;
		else
			return 0;
	}

	/* Mask is not assigned yet. So assign it and init hashtable
	 * according to that.
	 */
	err = fl_init_hashtable(head, mask);
	if (err)
		return err;
	memcpy(&head->mask, mask, sizeof(head->mask));
	head->mask_assigned = true;

	fl_init_dissector(head, mask);

	return 0;
}

static int fl_set_parms(struct net *net, struct tcf_proto *tp,
			struct cls_fl_filter *f, struct fl_flow_mask *mask,
			unsigned long base, struct nlattr **tb,
			struct nlattr *est, bool ovr)
{
	struct tcf_exts e;
	int err;

	err = tcf_exts_init(&e, TCA_FLOWER_ACT, 0);
	if (err < 0)
		return err;
	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
	if (err < 0)
		goto errout;

	if (tb[TCA_FLOWER_CLASSID]) {
		f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
		tcf_bind_filter(tp, &f->res, base);
	}

	err = fl_set_key(net, tb, &f->key, &mask->key);
	if (err)
		goto errout;

	fl_mask_update_range(mask);
	fl_set_masked_key(&f->mkey, &f->key, mask);

	tcf_exts_change(tp, &f->exts, &e);

	return 0;
errout:
	tcf_exts_destroy(&e);
	return err;
}

static u32 fl_grab_new_handle(struct tcf_proto *tp,
			      struct cls_fl_head *head)
{
	unsigned int i = 0x80000000;
	u32 handle;

	do {
		if (++head->hgen == 0x7FFFFFFF)
			head->hgen = 1;
	} while (--i > 0 && fl_get(tp, head->hgen));

	if (unlikely(i == 0)) {
		pr_err("Insufficient number of handles\n");
		handle = 0;
	} else {
		handle = head->hgen;
	}

	return handle;
}

static int fl_change(struct net *net, struct sk_buff *in_skb,
		     struct tcf_proto *tp, unsigned long base,
		     u32 handle, struct nlattr **tca,
		     unsigned long *arg, bool ovr)
{
	struct cls_fl_head *head = rtnl_dereference(tp->root);
	struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg;
	struct cls_fl_filter *fnew;
	struct nlattr *tb[TCA_FLOWER_MAX + 1];
	struct fl_flow_mask mask = {};
	int err;

	if (!tca[TCA_OPTIONS])
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy);
	if (err < 0)
		return err;

	if (fold && handle && fold->handle != handle)
		return -EINVAL;

	fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
	if (!fnew)
		return -ENOBUFS;

	err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
	if (err < 0)
		goto errout;

	if (!handle) {
		handle = fl_grab_new_handle(tp, head);
		if (!handle) {
			err = -EINVAL;
			goto errout;
		}
	}
	fnew->handle = handle;

	if (tb[TCA_FLOWER_FLAGS]) {
		fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);

		if (!tc_flags_valid(fnew->flags)) {
			err = -EINVAL;
			goto errout;
		}
	}

	err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
	if (err)
		goto errout;

	err = fl_check_assign_mask(head, &mask);
	if (err)
		goto errout;

	if (!tc_skip_sw(fnew->flags)) {
		err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
					     head->ht_params);
		if (err)
			goto errout;
	}

	err = fl_hw_replace_filter(tp,
				   &head->dissector,
				   &mask.key,
				   &fnew->key,
				   &fnew->exts,
				   (unsigned long)fnew,
				   fnew->flags);
	if (err)
		goto errout;

	if (fold) {
		rhashtable_remove_fast(&head->ht, &fold->ht_node,
				       head->ht_params);
		fl_hw_destroy_filter(tp, (unsigned long)fold);
	}

	*arg = (unsigned long) fnew;

	if (fold) {
		list_replace_rcu(&fold->list, &fnew->list);
		tcf_unbind_filter(tp, &fold->res);
		call_rcu(&fold->rcu, fl_destroy_filter);
	} else {
		list_add_tail_rcu(&fnew->list, &head->filters);
	}

	return 0;

errout:
	tcf_exts_destroy(&fnew->exts);
	kfree(fnew);
	return err;
}

static int fl_delete(struct tcf_proto *tp, unsigned long arg)
{
	struct cls_fl_head *head = rtnl_dereference(tp->root);
	struct cls_fl_filter *f = (struct cls_fl_filter *) arg;

	rhashtable_remove_fast(&head->ht, &f->ht_node,
			       head->ht_params);
	list_del_rcu(&f->list);
	fl_hw_destroy_filter(tp, (unsigned long)f);
	tcf_unbind_filter(tp, &f->res);
	call_rcu(&f->rcu, fl_destroy_filter);
	return 0;
}

static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
{
	struct cls_fl_head *head = rtnl_dereference(tp->root);
	struct cls_fl_filter *f;

	list_for_each_entry_rcu(f, &head->filters, list) {
		if (arg->count < arg->skip)
			goto skip;
		if (arg->fn(tp, (unsigned long) f, arg) < 0) {
			arg->stop = 1;
			break;
		}
skip:
		arg->count++;
	}
}

static int fl_dump_key_val(struct sk_buff *skb,
			   void *val, int val_type,
			   void *mask, int mask_type, int len)
{
	int err;

	if (!memchr_inv(mask, 0, len))
		return 0;
	err = nla_put(skb, val_type, len, val);
	if (err)
		return err;
	if (mask_type != TCA_FLOWER_UNSPEC) {
		err = nla_put(skb, mask_type, len, mask);
		if (err)
			return err;
	}
	return 0;
}

static int fl_dump_key_vlan(struct sk_buff *skb,
			    struct flow_dissector_key_vlan *vlan_key,
			    struct flow_dissector_key_vlan *vlan_mask)
{
	int err;

	if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask)))
		return 0;
	if (vlan_mask->vlan_id) {
		err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID,
				  vlan_key->vlan_id);
		if (err)
			return err;
	}
	if (vlan_mask->vlan_priority) {
		err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO,
				 vlan_key->vlan_priority);
		if (err)
			return err;
	}
	return 0;
}

static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
		   struct sk_buff *skb, struct tcmsg *t)
{
	struct cls_fl_head *head = rtnl_dereference(tp->root);
	struct cls_fl_filter *f = (struct cls_fl_filter *) fh;
	struct nlattr *nest;
	struct fl_flow_key *key, *mask;

	if (!f)
		return skb->len;

	t->tcm_handle = f->handle;

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (!nest)
		goto nla_put_failure;

	if (f->res.classid &&
	    nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
		goto nla_put_failure;

	key = &f->key;
	mask = &head->mask.key;

	if (mask->indev_ifindex) {
		struct net_device *dev;

		dev = __dev_get_by_index(net, key->indev_ifindex);
		if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
			goto nla_put_failure;
	}

	fl_hw_update_stats(tp, f);

	if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
			    mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
			    sizeof(key->eth.dst)) ||
	    fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
			    mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
			    sizeof(key->eth.src)) ||
	    fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
			    &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
			    sizeof(key->basic.n_proto)))
		goto nla_put_failure;

	if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
		goto nla_put_failure;

	if ((key->basic.n_proto == htons(ETH_P_IP) ||
	     key->basic.n_proto == htons(ETH_P_IPV6)) &&
	    fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
			    &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
			    sizeof(key->basic.ip_proto)))
		goto nla_put_failure;

	if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
	    (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
			     &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
			     sizeof(key->ipv4.src)) ||
	     fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
			     &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
			     sizeof(key->ipv4.dst))))
		goto nla_put_failure;
	else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
		 (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
				  &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
				  sizeof(key->ipv6.src)) ||
		  fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
				  &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
				  sizeof(key->ipv6.dst))))
		goto nla_put_failure;

	if (key->basic.ip_proto == IPPROTO_TCP &&
	    (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
			     &mask->tp.src, TCA_FLOWER_KEY_TCP_SRC_MASK,
			     sizeof(key->tp.src)) ||
	     fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
			     &mask->tp.dst, TCA_FLOWER_KEY_TCP_DST_MASK,
			     sizeof(key->tp.dst))))
		goto nla_put_failure;
	else if (key->basic.ip_proto == IPPROTO_UDP &&
		 (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
				  &mask->tp.src, TCA_FLOWER_KEY_UDP_SRC_MASK,
				  sizeof(key->tp.src)) ||
		  fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
				  &mask->tp.dst, TCA_FLOWER_KEY_UDP_DST_MASK,
				  sizeof(key->tp.dst))))
		goto nla_put_failure;

	if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
	    (fl_dump_key_val(skb, &key->enc_ipv4.src,
			    TCA_FLOWER_KEY_ENC_IPV4_SRC, &mask->enc_ipv4.src,
			    TCA_FLOWER_KEY_ENC_IPV4_SRC_MASK,
			    sizeof(key->enc_ipv4.src)) ||
	     fl_dump_key_val(skb, &key->enc_ipv4.dst,
			     TCA_FLOWER_KEY_ENC_IPV4_DST, &mask->enc_ipv4.dst,
			     TCA_FLOWER_KEY_ENC_IPV4_DST_MASK,
			     sizeof(key->enc_ipv4.dst))))
		goto nla_put_failure;
	else if (key->enc_control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
		 (fl_dump_key_val(skb, &key->enc_ipv6.src,
			    TCA_FLOWER_KEY_ENC_IPV6_SRC, &mask->enc_ipv6.src,
			    TCA_FLOWER_KEY_ENC_IPV6_SRC_MASK,
			    sizeof(key->enc_ipv6.src)) ||
		 fl_dump_key_val(skb, &key->enc_ipv6.dst,
				 TCA_FLOWER_KEY_ENC_IPV6_DST,
				 &mask->enc_ipv6.dst,
				 TCA_FLOWER_KEY_ENC_IPV6_DST_MASK,
			    sizeof(key->enc_ipv6.dst))))
		goto nla_put_failure;

	if (fl_dump_key_val(skb, &key->enc_key_id, TCA_FLOWER_KEY_ENC_KEY_ID,
			    &mask->enc_key_id, TCA_FLOWER_UNSPEC,
			    sizeof(key->enc_key_id)))
		goto nla_put_failure;

	nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags);

	if (tcf_exts_dump(skb, &f->exts))
		goto nla_put_failure;

	nla_nest_end(skb, nest);

	if (tcf_exts_dump_stats(skb, &f->exts) < 0)
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nla_nest_cancel(skb, nest);
	return -1;
}

static struct tcf_proto_ops cls_fl_ops __read_mostly = {
	.kind		= "flower",
	.classify	= fl_classify,
	.init		= fl_init,
	.destroy	= fl_destroy,
	.get		= fl_get,
	.change		= fl_change,
	.delete		= fl_delete,
	.walk		= fl_walk,
	.dump		= fl_dump,
	.owner		= THIS_MODULE,
};

static int __init cls_fl_init(void)
{
	return register_tcf_proto_ops(&cls_fl_ops);
}

static void __exit cls_fl_exit(void)
{
	unregister_tcf_proto_ops(&cls_fl_ops);
}

module_init(cls_fl_init);
module_exit(cls_fl_exit);

MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
MODULE_DESCRIPTION("Flower classifier");
MODULE_LICENSE("GPL v2");