summaryrefslogtreecommitdiff
path: root/net/netfilter/nft_meta.c
blob: ba0d3683a45d32aae8e7240b035c7facc604aea0 (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
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2014 Intel Corporation
 * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/kernel.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/static_key.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/sock.h>
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nft_meta.h>
#include <net/netfilter/nf_tables_offload.h>

#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */

#define NFT_META_SECS_PER_MINUTE	60
#define NFT_META_SECS_PER_HOUR		3600
#define NFT_META_SECS_PER_DAY		86400
#define NFT_META_DAYS_PER_WEEK		7

static u8 nft_meta_weekday(void)
{
	time64_t secs = ktime_get_real_seconds();
	unsigned int dse;
	u8 wday;

	secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
	dse = div_u64(secs, NFT_META_SECS_PER_DAY);
	wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;

	return wday;
}

static u32 nft_meta_hour(time64_t secs)
{
	struct tm tm;

	time64_to_tm(secs, 0, &tm);

	return tm.tm_hour * NFT_META_SECS_PER_HOUR
		+ tm.tm_min * NFT_META_SECS_PER_MINUTE
		+ tm.tm_sec;
}

static noinline_for_stack void
nft_meta_get_eval_time(enum nft_meta_keys key,
		       u32 *dest)
{
	switch (key) {
	case NFT_META_TIME_NS:
		nft_reg_store64((u64 *)dest, ktime_get_real_ns());
		break;
	case NFT_META_TIME_DAY:
		nft_reg_store8(dest, nft_meta_weekday());
		break;
	case NFT_META_TIME_HOUR:
		*dest = nft_meta_hour(ktime_get_real_seconds());
		break;
	default:
		break;
	}
}

static noinline bool
nft_meta_get_eval_pkttype_lo(const struct nft_pktinfo *pkt,
			     u32 *dest)
{
	const struct sk_buff *skb = pkt->skb;

	switch (nft_pf(pkt)) {
	case NFPROTO_IPV4:
		if (ipv4_is_multicast(ip_hdr(skb)->daddr))
			nft_reg_store8(dest, PACKET_MULTICAST);
		else
			nft_reg_store8(dest, PACKET_BROADCAST);
		break;
	case NFPROTO_IPV6:
		nft_reg_store8(dest, PACKET_MULTICAST);
		break;
	case NFPROTO_NETDEV:
		switch (skb->protocol) {
		case htons(ETH_P_IP): {
			int noff = skb_network_offset(skb);
			struct iphdr *iph, _iph;

			iph = skb_header_pointer(skb, noff,
						 sizeof(_iph), &_iph);
			if (!iph)
				return false;

			if (ipv4_is_multicast(iph->daddr))
				nft_reg_store8(dest, PACKET_MULTICAST);
			else
				nft_reg_store8(dest, PACKET_BROADCAST);

			break;
		}
		case htons(ETH_P_IPV6):
			nft_reg_store8(dest, PACKET_MULTICAST);
			break;
		default:
			WARN_ON_ONCE(1);
			return false;
		}
		break;
	default:
		WARN_ON_ONCE(1);
		return false;
	}

	return true;
}

static noinline bool
nft_meta_get_eval_skugid(enum nft_meta_keys key,
			 u32 *dest,
			 const struct nft_pktinfo *pkt)
{
	struct sock *sk = skb_to_full_sk(pkt->skb);
	struct socket *sock;

	if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
		return false;

	read_lock_bh(&sk->sk_callback_lock);
	sock = sk->sk_socket;
	if (!sock || !sock->file) {
		read_unlock_bh(&sk->sk_callback_lock);
		return false;
	}

	switch (key) {
	case NFT_META_SKUID:
		*dest = from_kuid_munged(sock_net(sk)->user_ns,
					 sock->file->f_cred->fsuid);
		break;
	case NFT_META_SKGID:
		*dest =	from_kgid_munged(sock_net(sk)->user_ns,
					 sock->file->f_cred->fsgid);
		break;
	default:
		break;
	}

	read_unlock_bh(&sk->sk_callback_lock);
	return true;
}

#ifdef CONFIG_CGROUP_NET_CLASSID
static noinline bool
nft_meta_get_eval_cgroup(u32 *dest, const struct nft_pktinfo *pkt)
{
	struct sock *sk = skb_to_full_sk(pkt->skb);

	if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
		return false;

	*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
	return true;
}
#endif

static noinline bool nft_meta_get_eval_kind(enum nft_meta_keys key,
					    u32 *dest,
					    const struct nft_pktinfo *pkt)
{
	const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);

	switch (key) {
	case NFT_META_IIFKIND:
		if (!in || !in->rtnl_link_ops)
			return false;
		strscpy_pad((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
		break;
	case NFT_META_OIFKIND:
		if (!out || !out->rtnl_link_ops)
			return false;
		strscpy_pad((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
		break;
	default:
		return false;
	}

	return true;
}

static void nft_meta_store_ifindex(u32 *dest, const struct net_device *dev)
{
	*dest = dev ? dev->ifindex : 0;
}

static void nft_meta_store_ifname(u32 *dest, const struct net_device *dev)
{
	strscpy_pad((char *)dest, dev ? dev->name : "", IFNAMSIZ);
}

static bool nft_meta_store_iftype(u32 *dest, const struct net_device *dev)
{
	if (!dev)
		return false;

	nft_reg_store16(dest, dev->type);
	return true;
}

static bool nft_meta_store_ifgroup(u32 *dest, const struct net_device *dev)
{
	if (!dev)
		return false;

	*dest = dev->group;
	return true;
}

static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 *dest,
				     const struct nft_pktinfo *pkt)
{
	switch (key) {
	case NFT_META_IIFNAME:
		nft_meta_store_ifname(dest, nft_in(pkt));
		break;
	case NFT_META_OIFNAME:
		nft_meta_store_ifname(dest, nft_out(pkt));
		break;
	case NFT_META_IIF:
		nft_meta_store_ifindex(dest, nft_in(pkt));
		break;
	case NFT_META_OIF:
		nft_meta_store_ifindex(dest, nft_out(pkt));
		break;
	case NFT_META_IFTYPE:
		if (!nft_meta_store_iftype(dest, pkt->skb->dev))
			return false;
		break;
	case __NFT_META_IIFTYPE:
		if (!nft_meta_store_iftype(dest, nft_in(pkt)))
			return false;
		break;
	case NFT_META_OIFTYPE:
		if (!nft_meta_store_iftype(dest, nft_out(pkt)))
			return false;
		break;
	case NFT_META_IIFGROUP:
		if (!nft_meta_store_ifgroup(dest, nft_in(pkt)))
			return false;
		break;
	case NFT_META_OIFGROUP:
		if (!nft_meta_store_ifgroup(dest, nft_out(pkt)))
			return false;
		break;
	default:
		return false;
	}

	return true;
}

#ifdef CONFIG_IP_ROUTE_CLASSID
static noinline bool
nft_meta_get_eval_rtclassid(const struct sk_buff *skb, u32 *dest)
{
	const struct dst_entry *dst = skb_dst(skb);

	if (!dst)
		return false;

	*dest = dst->tclassid;
	return true;
}
#endif

static noinline u32 nft_meta_get_eval_sdif(const struct nft_pktinfo *pkt)
{
	switch (nft_pf(pkt)) {
	case NFPROTO_IPV4:
		return inet_sdif(pkt->skb);
	case NFPROTO_IPV6:
		return inet6_sdif(pkt->skb);
	}

	return 0;
}

static noinline void
nft_meta_get_eval_sdifname(u32 *dest, const struct nft_pktinfo *pkt)
{
	u32 sdif = nft_meta_get_eval_sdif(pkt);
	const struct net_device *dev;

	dev = sdif ? dev_get_by_index_rcu(nft_net(pkt), sdif) : NULL;
	nft_meta_store_ifname(dest, dev);
}

void nft_meta_get_eval(const struct nft_expr *expr,
		       struct nft_regs *regs,
		       const struct nft_pktinfo *pkt)
{
	const struct nft_meta *priv = nft_expr_priv(expr);
	const struct sk_buff *skb = pkt->skb;
	u32 *dest = &regs->data[priv->dreg];

	switch (priv->key) {
	case NFT_META_LEN:
		*dest = skb->len;
		break;
	case NFT_META_PROTOCOL:
		nft_reg_store16(dest, (__force u16)skb->protocol);
		break;
	case NFT_META_NFPROTO:
		nft_reg_store8(dest, nft_pf(pkt));
		break;
	case NFT_META_L4PROTO:
		if (!(pkt->flags & NFT_PKTINFO_L4PROTO))
			goto err;
		nft_reg_store8(dest, pkt->tprot);
		break;
	case NFT_META_PRIORITY:
		*dest = skb->priority;
		break;
	case NFT_META_MARK:
		*dest = skb->mark;
		break;
	case NFT_META_IIF:
	case NFT_META_OIF:
	case NFT_META_IIFNAME:
	case NFT_META_OIFNAME:
	case NFT_META_IIFTYPE:
	case NFT_META_OIFTYPE:
	case NFT_META_IIFGROUP:
	case NFT_META_OIFGROUP:
		if (!nft_meta_get_eval_ifname(priv->key, dest, pkt))
			goto err;
		break;
	case NFT_META_SKUID:
	case NFT_META_SKGID:
		if (!nft_meta_get_eval_skugid(priv->key, dest, pkt))
			goto err;
		break;
#ifdef CONFIG_IP_ROUTE_CLASSID
	case NFT_META_RTCLASSID:
		if (!nft_meta_get_eval_rtclassid(skb, dest))
			goto err;
		break;
#endif
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
		*dest = skb->secmark;
		break;
#endif
	case NFT_META_PKTTYPE:
		if (skb->pkt_type != PACKET_LOOPBACK) {
			nft_reg_store8(dest, skb->pkt_type);
			break;
		}

		if (!nft_meta_get_eval_pkttype_lo(pkt, dest))
			goto err;
		break;
	case NFT_META_CPU:
		*dest = raw_smp_processor_id();
		break;
#ifdef CONFIG_CGROUP_NET_CLASSID
	case NFT_META_CGROUP:
		if (!nft_meta_get_eval_cgroup(dest, pkt))
			goto err;
		break;
#endif
	case NFT_META_PRANDOM:
		*dest = get_random_u32();
		break;
#ifdef CONFIG_XFRM
	case NFT_META_SECPATH:
		nft_reg_store8(dest, secpath_exists(skb));
		break;
#endif
	case NFT_META_IIFKIND:
	case NFT_META_OIFKIND:
		if (!nft_meta_get_eval_kind(priv->key, dest, pkt))
			goto err;
		break;
	case NFT_META_TIME_NS:
	case NFT_META_TIME_DAY:
	case NFT_META_TIME_HOUR:
		nft_meta_get_eval_time(priv->key, dest);
		break;
	case NFT_META_SDIF:
		*dest = nft_meta_get_eval_sdif(pkt);
		break;
	case NFT_META_SDIFNAME:
		nft_meta_get_eval_sdifname(dest, pkt);
		break;
	default:
		WARN_ON(1);
		goto err;
	}
	return;

err:
	regs->verdict.code = NFT_BREAK;
}
EXPORT_SYMBOL_GPL(nft_meta_get_eval);

void nft_meta_set_eval(const struct nft_expr *expr,
		       struct nft_regs *regs,
		       const struct nft_pktinfo *pkt)
{
	const struct nft_meta *meta = nft_expr_priv(expr);
	struct sk_buff *skb = pkt->skb;
	u32 *sreg = &regs->data[meta->sreg];
	u32 value = *sreg;
	u8 value8;

	switch (meta->key) {
	case NFT_META_MARK:
		skb->mark = value;
		break;
	case NFT_META_PRIORITY:
		skb->priority = value;
		break;
	case NFT_META_PKTTYPE:
		value8 = nft_reg_load8(sreg);

		if (skb->pkt_type != value8 &&
		    skb_pkt_type_ok(value8) &&
		    skb_pkt_type_ok(skb->pkt_type))
			skb->pkt_type = value8;
		break;
	case NFT_META_NFTRACE:
		value8 = nft_reg_load8(sreg);

		skb->nf_trace = !!value8;
		break;
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
		skb->secmark = value;
		break;
#endif
	default:
		WARN_ON(1);
	}
}
EXPORT_SYMBOL_GPL(nft_meta_set_eval);

const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
	[NFTA_META_DREG]	= { .type = NLA_U32 },
	[NFTA_META_KEY]		= NLA_POLICY_MAX(NLA_BE32, 255),
	[NFTA_META_SREG]	= { .type = NLA_U32 },
};
EXPORT_SYMBOL_GPL(nft_meta_policy);

int nft_meta_get_init(const struct nft_ctx *ctx,
		      const struct nft_expr *expr,
		      const struct nlattr * const tb[])
{
	struct nft_meta *priv = nft_expr_priv(expr);
	unsigned int len;

	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
	switch (priv->key) {
	case NFT_META_PROTOCOL:
	case NFT_META_IIFTYPE:
	case NFT_META_OIFTYPE:
		len = sizeof(u16);
		break;
	case NFT_META_NFPROTO:
	case NFT_META_L4PROTO:
	case NFT_META_LEN:
	case NFT_META_PRIORITY:
	case NFT_META_MARK:
	case NFT_META_IIF:
	case NFT_META_OIF:
	case NFT_META_SDIF:
	case NFT_META_SKUID:
	case NFT_META_SKGID:
#ifdef CONFIG_IP_ROUTE_CLASSID
	case NFT_META_RTCLASSID:
#endif
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
#endif
	case NFT_META_PKTTYPE:
	case NFT_META_CPU:
	case NFT_META_IIFGROUP:
	case NFT_META_OIFGROUP:
#ifdef CONFIG_CGROUP_NET_CLASSID
	case NFT_META_CGROUP:
#endif
		len = sizeof(u32);
		break;
	case NFT_META_IIFNAME:
	case NFT_META_OIFNAME:
	case NFT_META_IIFKIND:
	case NFT_META_OIFKIND:
	case NFT_META_SDIFNAME:
		len = IFNAMSIZ;
		break;
	case NFT_META_PRANDOM:
		len = sizeof(u32);
		break;
#ifdef CONFIG_XFRM
	case NFT_META_SECPATH:
		len = sizeof(u8);
		break;
#endif
	case NFT_META_TIME_NS:
		len = sizeof(u64);
		break;
	case NFT_META_TIME_DAY:
		len = sizeof(u8);
		break;
	case NFT_META_TIME_HOUR:
		len = sizeof(u32);
		break;
	default:
		return -EOPNOTSUPP;
	}

	priv->len = len;
	return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
					NULL, NFT_DATA_VALUE, len);
}
EXPORT_SYMBOL_GPL(nft_meta_get_init);

static int nft_meta_get_validate_sdif(const struct nft_ctx *ctx)
{
	unsigned int hooks;

	switch (ctx->family) {
	case NFPROTO_IPV4:
	case NFPROTO_IPV6:
	case NFPROTO_INET:
		hooks = (1 << NF_INET_LOCAL_IN) |
			(1 << NF_INET_FORWARD);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return nft_chain_validate_hooks(ctx->chain, hooks);
}

static int nft_meta_get_validate_xfrm(const struct nft_ctx *ctx)
{
#ifdef CONFIG_XFRM
	unsigned int hooks;

	switch (ctx->family) {
	case NFPROTO_NETDEV:
		hooks = 1 << NF_NETDEV_INGRESS;
		break;
	case NFPROTO_IPV4:
	case NFPROTO_IPV6:
	case NFPROTO_INET:
		hooks = (1 << NF_INET_PRE_ROUTING) |
			(1 << NF_INET_LOCAL_IN) |
			(1 << NF_INET_FORWARD);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return nft_chain_validate_hooks(ctx->chain, hooks);
#else
	return 0;
#endif
}

static int nft_meta_get_validate(const struct nft_ctx *ctx,
				 const struct nft_expr *expr,
				 const struct nft_data **data)
{
	const struct nft_meta *priv = nft_expr_priv(expr);

	switch (priv->key) {
	case NFT_META_SECPATH:
		return nft_meta_get_validate_xfrm(ctx);
	case NFT_META_SDIF:
	case NFT_META_SDIFNAME:
		return nft_meta_get_validate_sdif(ctx);
	default:
		break;
	}

	return 0;
}

int nft_meta_set_validate(const struct nft_ctx *ctx,
			  const struct nft_expr *expr,
			  const struct nft_data **data)
{
	struct nft_meta *priv = nft_expr_priv(expr);
	unsigned int hooks;

	if (priv->key != NFT_META_PKTTYPE)
		return 0;

	switch (ctx->family) {
	case NFPROTO_BRIDGE:
		hooks = 1 << NF_BR_PRE_ROUTING;
		break;
	case NFPROTO_NETDEV:
		hooks = 1 << NF_NETDEV_INGRESS;
		break;
	case NFPROTO_IPV4:
	case NFPROTO_IPV6:
	case NFPROTO_INET:
		hooks = 1 << NF_INET_PRE_ROUTING;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return nft_chain_validate_hooks(ctx->chain, hooks);
}
EXPORT_SYMBOL_GPL(nft_meta_set_validate);

int nft_meta_set_init(const struct nft_ctx *ctx,
		      const struct nft_expr *expr,
		      const struct nlattr * const tb[])
{
	struct nft_meta *priv = nft_expr_priv(expr);
	unsigned int len;
	int err;

	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
	switch (priv->key) {
	case NFT_META_MARK:
	case NFT_META_PRIORITY:
#ifdef CONFIG_NETWORK_SECMARK
	case NFT_META_SECMARK:
#endif
		len = sizeof(u32);
		break;
	case NFT_META_NFTRACE:
		len = sizeof(u8);
		break;
	case NFT_META_PKTTYPE:
		len = sizeof(u8);
		break;
	default:
		return -EOPNOTSUPP;
	}

	priv->len = len;
	err = nft_parse_register_load(tb[NFTA_META_SREG], &priv->sreg, len);
	if (err < 0)
		return err;

	if (priv->key == NFT_META_NFTRACE)
		static_branch_inc(&nft_trace_enabled);

	return 0;
}
EXPORT_SYMBOL_GPL(nft_meta_set_init);

int nft_meta_get_dump(struct sk_buff *skb,
		      const struct nft_expr *expr, bool reset)
{
	const struct nft_meta *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
		goto nla_put_failure;
	if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_get_dump);

int nft_meta_set_dump(struct sk_buff *skb,
		      const struct nft_expr *expr, bool reset)
{
	const struct nft_meta *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
		goto nla_put_failure;
	if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -1;
}
EXPORT_SYMBOL_GPL(nft_meta_set_dump);

void nft_meta_set_destroy(const struct nft_ctx *ctx,
			  const struct nft_expr *expr)
{
	const struct nft_meta *priv = nft_expr_priv(expr);

	if (priv->key == NFT_META_NFTRACE)
		static_branch_dec(&nft_trace_enabled);
}
EXPORT_SYMBOL_GPL(nft_meta_set_destroy);

static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
				struct nft_flow_rule *flow,
				const struct nft_expr *expr)
{
	const struct nft_meta *priv = nft_expr_priv(expr);
	struct nft_offload_reg *reg = &ctx->regs[priv->dreg];

	switch (priv->key) {
	case NFT_META_PROTOCOL:
		NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
					sizeof(__u16), reg);
		nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
		break;
	case NFT_META_L4PROTO:
		NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
					sizeof(__u8), reg);
		nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
		break;
	case NFT_META_IIF:
		NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
					ingress_ifindex, sizeof(__u32), reg);
		break;
	case NFT_META_IIFTYPE:
		NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
					ingress_iftype, sizeof(__u16), reg);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

bool nft_meta_get_reduce(struct nft_regs_track *track,
			 const struct nft_expr *expr)
{
	const struct nft_meta *priv = nft_expr_priv(expr);
	const struct nft_meta *meta;

	if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
		nft_reg_track_update(track, expr, priv->dreg, priv->len);
		return false;
	}

	meta = nft_expr_priv(track->regs[priv->dreg].selector);
	if (priv->key != meta->key ||
	    priv->dreg != meta->dreg) {
		nft_reg_track_update(track, expr, priv->dreg, priv->len);
		return false;
	}

	if (!track->regs[priv->dreg].bitwise)
		return true;

	return nft_expr_reduce_bitwise(track, expr);
}
EXPORT_SYMBOL_GPL(nft_meta_get_reduce);

static const struct nft_expr_ops nft_meta_get_ops = {
	.type		= &nft_meta_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	.eval		= nft_meta_get_eval,
	.init		= nft_meta_get_init,
	.dump		= nft_meta_get_dump,
	.reduce		= nft_meta_get_reduce,
	.validate	= nft_meta_get_validate,
	.offload	= nft_meta_get_offload,
};

static bool nft_meta_set_reduce(struct nft_regs_track *track,
				const struct nft_expr *expr)
{
	int i;

	for (i = 0; i < NFT_REG32_NUM; i++) {
		if (!track->regs[i].selector)
			continue;

		if (track->regs[i].selector->ops != &nft_meta_get_ops)
			continue;

		__nft_reg_track_cancel(track, i);
	}

	return false;
}

static const struct nft_expr_ops nft_meta_set_ops = {
	.type		= &nft_meta_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	.eval		= nft_meta_set_eval,
	.init		= nft_meta_set_init,
	.destroy	= nft_meta_set_destroy,
	.dump		= nft_meta_set_dump,
	.reduce		= nft_meta_set_reduce,
	.validate	= nft_meta_set_validate,
};

static const struct nft_expr_ops *
nft_meta_select_ops(const struct nft_ctx *ctx,
		    const struct nlattr * const tb[])
{
	if (tb[NFTA_META_KEY] == NULL)
		return ERR_PTR(-EINVAL);

	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
		return ERR_PTR(-EINVAL);

#if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META)
	if (ctx->family == NFPROTO_BRIDGE)
		return ERR_PTR(-EAGAIN);
#endif
	if (tb[NFTA_META_DREG])
		return &nft_meta_get_ops;

	if (tb[NFTA_META_SREG])
		return &nft_meta_set_ops;

	return ERR_PTR(-EINVAL);
}

static int nft_meta_inner_init(const struct nft_ctx *ctx,
			       const struct nft_expr *expr,
			       const struct nlattr * const tb[])
{
	struct nft_meta *priv = nft_expr_priv(expr);
	unsigned int len;

	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
	switch (priv->key) {
	case NFT_META_PROTOCOL:
		len = sizeof(u16);
		break;
	case NFT_META_L4PROTO:
		len = sizeof(u32);
		break;
	default:
		return -EOPNOTSUPP;
	}
	priv->len = len;

	return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
					NULL, NFT_DATA_VALUE, len);
}

void nft_meta_inner_eval(const struct nft_expr *expr,
			 struct nft_regs *regs,
			 const struct nft_pktinfo *pkt,
			 struct nft_inner_tun_ctx *tun_ctx)
{
	const struct nft_meta *priv = nft_expr_priv(expr);
	u32 *dest = &regs->data[priv->dreg];

	switch (priv->key) {
	case NFT_META_PROTOCOL:
		nft_reg_store16(dest, (__force u16)tun_ctx->llproto);
		break;
	case NFT_META_L4PROTO:
		if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_TH))
			goto err;

		nft_reg_store8(dest, tun_ctx->l4proto);
		break;
	default:
		WARN_ON_ONCE(1);
		goto err;
	}
	return;

err:
	regs->verdict.code = NFT_BREAK;
}
EXPORT_SYMBOL_GPL(nft_meta_inner_eval);

static const struct nft_expr_ops nft_meta_inner_ops = {
	.type		= &nft_meta_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
	.init		= nft_meta_inner_init,
	.dump		= nft_meta_get_dump,
	/* direct call to nft_meta_inner_eval(). */
};

struct nft_expr_type nft_meta_type __read_mostly = {
	.name		= "meta",
	.select_ops	= nft_meta_select_ops,
	.inner_ops	= &nft_meta_inner_ops,
	.policy		= nft_meta_policy,
	.maxattr	= NFTA_META_MAX,
	.owner		= THIS_MODULE,
};

#ifdef CONFIG_NETWORK_SECMARK
struct nft_secmark {
	u32 secid;
	char *ctx;
};

static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
	[NFTA_SECMARK_CTX]     = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
};

static int nft_secmark_compute_secid(struct nft_secmark *priv)
{
	u32 tmp_secid = 0;
	int err;

	err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
	if (err)
		return err;

	if (!tmp_secid)
		return -ENOENT;

	err = security_secmark_relabel_packet(tmp_secid);
	if (err)
		return err;

	priv->secid = tmp_secid;
	return 0;
}

static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs,
				 const struct nft_pktinfo *pkt)
{
	const struct nft_secmark *priv = nft_obj_data(obj);
	struct sk_buff *skb = pkt->skb;

	skb->secmark = priv->secid;
}

static int nft_secmark_obj_init(const struct nft_ctx *ctx,
				const struct nlattr * const tb[],
				struct nft_object *obj)
{
	struct nft_secmark *priv = nft_obj_data(obj);
	int err;

	if (tb[NFTA_SECMARK_CTX] == NULL)
		return -EINVAL;

	priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
	if (!priv->ctx)
		return -ENOMEM;

	err = nft_secmark_compute_secid(priv);
	if (err) {
		kfree(priv->ctx);
		return err;
	}

	security_secmark_refcount_inc();

	return 0;
}

static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj,
				bool reset)
{
	struct nft_secmark *priv = nft_obj_data(obj);
	int err;

	if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
		return -1;

	if (reset) {
		err = nft_secmark_compute_secid(priv);
		if (err)
			return err;
	}

	return 0;
}

static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
{
	struct nft_secmark *priv = nft_obj_data(obj);

	security_secmark_refcount_dec();

	kfree(priv->ctx);
}

static const struct nft_object_ops nft_secmark_obj_ops = {
	.type		= &nft_secmark_obj_type,
	.size		= sizeof(struct nft_secmark),
	.init		= nft_secmark_obj_init,
	.eval		= nft_secmark_obj_eval,
	.dump		= nft_secmark_obj_dump,
	.destroy	= nft_secmark_obj_destroy,
};
struct nft_object_type nft_secmark_obj_type __read_mostly = {
	.type		= NFT_OBJECT_SECMARK,
	.ops		= &nft_secmark_obj_ops,
	.maxattr	= NFTA_SECMARK_MAX,
	.policy		= nft_secmark_policy,
	.owner		= THIS_MODULE,
};
#endif /* CONFIG_NETWORK_SECMARK */