summaryrefslogtreecommitdiff
path: root/drivers/net/geneve.c
blob: c2b79f5d1c89b6b5872c8197fde3eb2d806d4f36 (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
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
/*
 * GENEVE: Generic Network Virtualization Encapsulation
 *
 * Copyright (c) 2015 Red Hat, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/hash.h>
#include <net/dst_metadata.h>
#include <net/gro_cells.h>
#include <net/rtnetlink.h>
#include <net/geneve.h>
#include <net/protocol.h>

#define GENEVE_NETDEV_VER	"0.6"

#define GENEVE_UDP_PORT		6081

#define GENEVE_N_VID		(1u << 24)
#define GENEVE_VID_MASK		(GENEVE_N_VID - 1)

#define VNI_HASH_BITS		10
#define VNI_HASH_SIZE		(1<<VNI_HASH_BITS)

static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");

#define GENEVE_VER 0
#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))

/* per-network namespace private data for this module */
struct geneve_net {
	struct list_head	geneve_list;
	struct list_head	sock_list;
};

static int geneve_net_id;

union geneve_addr {
	struct sockaddr_in sin;
	struct sockaddr_in6 sin6;
	struct sockaddr sa;
};

static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };

/* Pseudo network device */
struct geneve_dev {
	struct hlist_node  hlist;	/* vni hash table */
	struct net	   *net;	/* netns for packet i/o */
	struct net_device  *dev;	/* netdev for geneve tunnel */
	struct geneve_sock *sock4;	/* IPv4 socket used for geneve tunnel */
#if IS_ENABLED(CONFIG_IPV6)
	struct geneve_sock *sock6;	/* IPv6 socket used for geneve tunnel */
#endif
	u8                 vni[3];	/* virtual network ID for tunnel */
	u8                 ttl;		/* TTL override */
	u8                 tos;		/* TOS override */
	union geneve_addr  remote;	/* IP address for link partner */
	struct list_head   next;	/* geneve's per namespace list */
	__be16		   dst_port;
	bool		   collect_md;
	struct gro_cells   gro_cells;
};

struct geneve_sock {
	bool			collect_md;
	struct list_head	list;
	struct socket		*sock;
	struct rcu_head		rcu;
	int			refcnt;
	struct udp_offload	udp_offloads;
	struct hlist_head	vni_list[VNI_HASH_SIZE];
};

static inline __u32 geneve_net_vni_hash(u8 vni[3])
{
	__u32 vnid;

	vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
	return hash_32(vnid, VNI_HASH_BITS);
}

static __be64 vni_to_tunnel_id(const __u8 *vni)
{
#ifdef __BIG_ENDIAN
	return (vni[0] << 16) | (vni[1] << 8) | vni[2];
#else
	return (__force __be64)(((__force u64)vni[0] << 40) |
				((__force u64)vni[1] << 48) |
				((__force u64)vni[2] << 56));
#endif
}

static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
					__be32 addr, u8 vni[])
{
	struct hlist_head *vni_list_head;
	struct geneve_dev *geneve;
	__u32 hash;

	/* Find the device for this VNI */
	hash = geneve_net_vni_hash(vni);
	vni_list_head = &gs->vni_list[hash];
	hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
		if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
		    addr == geneve->remote.sin.sin_addr.s_addr)
			return geneve;
	}
	return NULL;
}

#if IS_ENABLED(CONFIG_IPV6)
static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
					 struct in6_addr addr6, u8 vni[])
{
	struct hlist_head *vni_list_head;
	struct geneve_dev *geneve;
	__u32 hash;

	/* Find the device for this VNI */
	hash = geneve_net_vni_hash(vni);
	vni_list_head = &gs->vni_list[hash];
	hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
		if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
		    ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
			return geneve;
	}
	return NULL;
}
#endif

static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
{
	return (struct genevehdr *)(udp_hdr(skb) + 1);
}

/* geneve receive/decap routine */
static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
{
	struct genevehdr *gnvh = geneve_hdr(skb);
	struct metadata_dst *tun_dst = NULL;
	struct geneve_dev *geneve = NULL;
	struct pcpu_sw_netstats *stats;
	struct iphdr *iph = NULL;
	__be32 addr;
	static u8 zero_vni[3];
	u8 *vni;
	int err = 0;
	sa_family_t sa_family;
#if IS_ENABLED(CONFIG_IPV6)
	struct ipv6hdr *ip6h = NULL;
	struct in6_addr addr6;
	static struct in6_addr zero_addr6;
#endif

	sa_family = gs->sock->sk->sk_family;

	if (sa_family == AF_INET) {
		iph = ip_hdr(skb); /* outer IP header... */

		if (gs->collect_md) {
			vni = zero_vni;
			addr = 0;
		} else {
			vni = gnvh->vni;

			addr = iph->saddr;
		}

		geneve = geneve_lookup(gs, addr, vni);
#if IS_ENABLED(CONFIG_IPV6)
	} else if (sa_family == AF_INET6) {
		ip6h = ipv6_hdr(skb); /* outer IPv6 header... */

		if (gs->collect_md) {
			vni = zero_vni;
			addr6 = zero_addr6;
		} else {
			vni = gnvh->vni;

			addr6 = ip6h->saddr;
		}

		geneve = geneve6_lookup(gs, addr6, vni);
#endif
	}
	if (!geneve)
		goto drop;

	if (ip_tunnel_collect_metadata() || gs->collect_md) {
		__be16 flags;

		flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
			(gnvh->oam ? TUNNEL_OAM : 0) |
			(gnvh->critical ? TUNNEL_CRIT_OPT : 0);

		tun_dst = udp_tun_rx_dst(skb, sa_family, flags,
					 vni_to_tunnel_id(gnvh->vni),
					 gnvh->opt_len * 4);
		if (!tun_dst)
			goto drop;
		/* Update tunnel dst according to Geneve options. */
		ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
					gnvh->options, gnvh->opt_len * 4);
	} else {
		/* Drop packets w/ critical options,
		 * since we don't support any...
		 */
		if (gnvh->critical)
			goto drop;
	}

	skb_reset_mac_header(skb);
	skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
	skb->protocol = eth_type_trans(skb, geneve->dev);
	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);

	if (tun_dst)
		skb_dst_set(skb, &tun_dst->dst);

	/* Ignore packet loops (and multicast echo) */
	if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
		goto drop;

	skb_reset_network_header(skb);

	if (iph)
		err = IP_ECN_decapsulate(iph, skb);
#if IS_ENABLED(CONFIG_IPV6)
	if (ip6h)
		err = IP6_ECN_decapsulate(ip6h, skb);
#endif

	if (unlikely(err)) {
		if (log_ecn_error) {
			if (iph)
				net_info_ratelimited("non-ECT from %pI4 "
						     "with TOS=%#x\n",
						     &iph->saddr, iph->tos);
#if IS_ENABLED(CONFIG_IPV6)
			if (ip6h)
				net_info_ratelimited("non-ECT from %pI6\n",
						     &ip6h->saddr);
#endif
		}
		if (err > 1) {
			++geneve->dev->stats.rx_frame_errors;
			++geneve->dev->stats.rx_errors;
			goto drop;
		}
	}

	stats = this_cpu_ptr(geneve->dev->tstats);
	u64_stats_update_begin(&stats->syncp);
	stats->rx_packets++;
	stats->rx_bytes += skb->len;
	u64_stats_update_end(&stats->syncp);

	gro_cells_receive(&geneve->gro_cells, skb);
	return;
drop:
	/* Consume bad packet */
	kfree_skb(skb);
}

/* Setup stats when device is created */
static int geneve_init(struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	int err;

	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!dev->tstats)
		return -ENOMEM;

	err = gro_cells_init(&geneve->gro_cells, dev);
	if (err) {
		free_percpu(dev->tstats);
		return err;
	}

	return 0;
}

static void geneve_uninit(struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);

	gro_cells_destroy(&geneve->gro_cells);
	free_percpu(dev->tstats);
}

/* Callback from net/ipv4/udp.c to receive packets */
static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
	struct genevehdr *geneveh;
	struct geneve_sock *gs;
	int opts_len;

	/* Need Geneve and inner Ethernet header to be present */
	if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
		goto error;

	/* Return packets with reserved bits set */
	geneveh = geneve_hdr(skb);
	if (unlikely(geneveh->ver != GENEVE_VER))
		goto error;

	if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
		goto error;

	opts_len = geneveh->opt_len * 4;
	if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
				 htons(ETH_P_TEB)))
		goto drop;

	gs = rcu_dereference_sk_user_data(sk);
	if (!gs)
		goto drop;

	geneve_rx(gs, skb);
	return 0;

drop:
	/* Consume bad packet */
	kfree_skb(skb);
	return 0;

error:
	/* Let the UDP layer deal with the skb */
	return 1;
}

static struct socket *geneve_create_sock(struct net *net, bool ipv6,
					 __be16 port)
{
	struct socket *sock;
	struct udp_port_cfg udp_conf;
	int err;

	memset(&udp_conf, 0, sizeof(udp_conf));

	if (ipv6) {
		udp_conf.family = AF_INET6;
		udp_conf.ipv6_v6only = 1;
	} else {
		udp_conf.family = AF_INET;
		udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
	}

	udp_conf.local_udp_port = port;

	/* Open UDP socket */
	err = udp_sock_create(net, &udp_conf, &sock);
	if (err < 0)
		return ERR_PTR(err);

	return sock;
}

static void geneve_notify_add_rx_port(struct geneve_sock *gs)
{
	struct sock *sk = gs->sock->sk;
	sa_family_t sa_family = sk->sk_family;
	int err;

	if (sa_family == AF_INET) {
		err = udp_add_offload(&gs->udp_offloads);
		if (err)
			pr_warn("geneve: udp_add_offload failed with status %d\n",
				err);
	}
}

static int geneve_hlen(struct genevehdr *gh)
{
	return sizeof(*gh) + gh->opt_len * 4;
}

static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
					   struct sk_buff *skb,
					   struct udp_offload *uoff)
{
	struct sk_buff *p, **pp = NULL;
	struct genevehdr *gh, *gh2;
	unsigned int hlen, gh_len, off_gnv;
	const struct packet_offload *ptype;
	__be16 type;
	int flush = 1;

	off_gnv = skb_gro_offset(skb);
	hlen = off_gnv + sizeof(*gh);
	gh = skb_gro_header_fast(skb, off_gnv);
	if (skb_gro_header_hard(skb, hlen)) {
		gh = skb_gro_header_slow(skb, hlen, off_gnv);
		if (unlikely(!gh))
			goto out;
	}

	if (gh->ver != GENEVE_VER || gh->oam)
		goto out;
	gh_len = geneve_hlen(gh);

	hlen = off_gnv + gh_len;
	if (skb_gro_header_hard(skb, hlen)) {
		gh = skb_gro_header_slow(skb, hlen, off_gnv);
		if (unlikely(!gh))
			goto out;
	}

	flush = 0;

	for (p = *head; p; p = p->next) {
		if (!NAPI_GRO_CB(p)->same_flow)
			continue;

		gh2 = (struct genevehdr *)(p->data + off_gnv);
		if (gh->opt_len != gh2->opt_len ||
		    memcmp(gh, gh2, gh_len)) {
			NAPI_GRO_CB(p)->same_flow = 0;
			continue;
		}
	}

	type = gh->proto_type;

	rcu_read_lock();
	ptype = gro_find_receive_by_type(type);
	if (!ptype) {
		flush = 1;
		goto out_unlock;
	}

	skb_gro_pull(skb, gh_len);
	skb_gro_postpull_rcsum(skb, gh, gh_len);
	pp = ptype->callbacks.gro_receive(head, skb);

out_unlock:
	rcu_read_unlock();
out:
	NAPI_GRO_CB(skb)->flush |= flush;

	return pp;
}

static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
			       struct udp_offload *uoff)
{
	struct genevehdr *gh;
	struct packet_offload *ptype;
	__be16 type;
	int gh_len;
	int err = -ENOSYS;

	udp_tunnel_gro_complete(skb, nhoff);

	gh = (struct genevehdr *)(skb->data + nhoff);
	gh_len = geneve_hlen(gh);
	type = gh->proto_type;

	rcu_read_lock();
	ptype = gro_find_complete_by_type(type);
	if (ptype)
		err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);

	rcu_read_unlock();
	return err;
}

/* Create new listen socket if needed */
static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
						bool ipv6)
{
	struct geneve_net *gn = net_generic(net, geneve_net_id);
	struct geneve_sock *gs;
	struct socket *sock;
	struct udp_tunnel_sock_cfg tunnel_cfg;
	int h;

	gs = kzalloc(sizeof(*gs), GFP_KERNEL);
	if (!gs)
		return ERR_PTR(-ENOMEM);

	sock = geneve_create_sock(net, ipv6, port);
	if (IS_ERR(sock)) {
		kfree(gs);
		return ERR_CAST(sock);
	}

	gs->sock = sock;
	gs->refcnt = 1;
	for (h = 0; h < VNI_HASH_SIZE; ++h)
		INIT_HLIST_HEAD(&gs->vni_list[h]);

	/* Initialize the geneve udp offloads structure */
	gs->udp_offloads.port = port;
	gs->udp_offloads.callbacks.gro_receive  = geneve_gro_receive;
	gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
	geneve_notify_add_rx_port(gs);

	/* Mark socket as an encapsulation socket */
	tunnel_cfg.sk_user_data = gs;
	tunnel_cfg.encap_type = 1;
	tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
	tunnel_cfg.encap_destroy = NULL;
	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
	list_add(&gs->list, &gn->sock_list);
	return gs;
}

static void geneve_notify_del_rx_port(struct geneve_sock *gs)
{
	struct sock *sk = gs->sock->sk;
	sa_family_t sa_family = sk->sk_family;

	if (sa_family == AF_INET)
		udp_del_offload(&gs->udp_offloads);
}

static void __geneve_sock_release(struct geneve_sock *gs)
{
	if (!gs || --gs->refcnt)
		return;

	list_del(&gs->list);
	geneve_notify_del_rx_port(gs);
	udp_tunnel_sock_release(gs->sock);
	kfree_rcu(gs, rcu);
}

static void geneve_sock_release(struct geneve_dev *geneve)
{
	__geneve_sock_release(geneve->sock4);
#if IS_ENABLED(CONFIG_IPV6)
	__geneve_sock_release(geneve->sock6);
#endif
}

static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
					    sa_family_t family,
					    __be16 dst_port)
{
	struct geneve_sock *gs;

	list_for_each_entry(gs, &gn->sock_list, list) {
		if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
		    inet_sk(gs->sock->sk)->sk.sk_family == family) {
			return gs;
		}
	}
	return NULL;
}

static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
{
	struct net *net = geneve->net;
	struct geneve_net *gn = net_generic(net, geneve_net_id);
	struct geneve_sock *gs;
	__u32 hash;

	gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
	if (gs) {
		gs->refcnt++;
		goto out;
	}

	gs = geneve_socket_create(net, geneve->dst_port, ipv6);
	if (IS_ERR(gs))
		return PTR_ERR(gs);

out:
	gs->collect_md = geneve->collect_md;
#if IS_ENABLED(CONFIG_IPV6)
	if (ipv6)
		geneve->sock6 = gs;
	else
#endif
		geneve->sock4 = gs;

	hash = geneve_net_vni_hash(geneve->vni);
	hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
	return 0;
}

static int geneve_open(struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
	bool metadata = geneve->collect_md;
	int ret = 0;

	geneve->sock4 = NULL;
#if IS_ENABLED(CONFIG_IPV6)
	geneve->sock6 = NULL;
	if (ipv6 || metadata)
		ret = geneve_sock_add(geneve, true);
#endif
	if (!ret && (!ipv6 || metadata))
		ret = geneve_sock_add(geneve, false);
	if (ret < 0)
		geneve_sock_release(geneve);

	return ret;
}

static int geneve_stop(struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);

	if (!hlist_unhashed(&geneve->hlist))
		hlist_del_rcu(&geneve->hlist);
	geneve_sock_release(geneve);
	return 0;
}

static void geneve_build_header(struct genevehdr *geneveh,
				__be16 tun_flags, u8 vni[3],
				u8 options_len, u8 *options)
{
	geneveh->ver = GENEVE_VER;
	geneveh->opt_len = options_len / 4;
	geneveh->oam = !!(tun_flags & TUNNEL_OAM);
	geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
	geneveh->rsvd1 = 0;
	memcpy(geneveh->vni, vni, 3);
	geneveh->proto_type = htons(ETH_P_TEB);
	geneveh->rsvd2 = 0;

	memcpy(geneveh->options, options, options_len);
}

static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
			    __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
			    bool csum, bool xnet)
{
	struct genevehdr *gnvh;
	int min_headroom;
	int err;

	skb_scrub_packet(skb, xnet);

	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
			+ GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
	err = skb_cow_head(skb, min_headroom);
	if (unlikely(err)) {
		kfree_skb(skb);
		goto free_rt;
	}

	skb = udp_tunnel_handle_offloads(skb, csum);
	if (IS_ERR(skb)) {
		err = PTR_ERR(skb);
		goto free_rt;
	}

	gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
	geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);

	skb_set_inner_protocol(skb, htons(ETH_P_TEB));
	return 0;

free_rt:
	ip_rt_put(rt);
	return err;
}

#if IS_ENABLED(CONFIG_IPV6)
static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
			     __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
			     bool csum, bool xnet)
{
	struct genevehdr *gnvh;
	int min_headroom;
	int err;

	skb_scrub_packet(skb, xnet);

	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
			+ GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
	err = skb_cow_head(skb, min_headroom);
	if (unlikely(err)) {
		kfree_skb(skb);
		goto free_dst;
	}

	skb = udp_tunnel_handle_offloads(skb, csum);
	if (IS_ERR(skb)) {
		err = PTR_ERR(skb);
		goto free_dst;
	}

	gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
	geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);

	skb_set_inner_protocol(skb, htons(ETH_P_TEB));
	return 0;

free_dst:
	dst_release(dst);
	return err;
}
#endif

static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
				       struct net_device *dev,
				       struct flowi4 *fl4,
				       struct ip_tunnel_info *info)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct rtable *rt = NULL;
	__u8 tos;

	memset(fl4, 0, sizeof(*fl4));
	fl4->flowi4_mark = skb->mark;
	fl4->flowi4_proto = IPPROTO_UDP;

	if (info) {
		fl4->daddr = info->key.u.ipv4.dst;
		fl4->saddr = info->key.u.ipv4.src;
		fl4->flowi4_tos = RT_TOS(info->key.tos);
	} else {
		tos = geneve->tos;
		if (tos == 1) {
			const struct iphdr *iip = ip_hdr(skb);

			tos = ip_tunnel_get_dsfield(iip, skb);
		}

		fl4->flowi4_tos = RT_TOS(tos);
		fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
	}

	rt = ip_route_output_key(geneve->net, fl4);
	if (IS_ERR(rt)) {
		netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
		return ERR_PTR(-ENETUNREACH);
	}
	if (rt->dst.dev == dev) { /* is this necessary? */
		netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
		ip_rt_put(rt);
		return ERR_PTR(-ELOOP);
	}
	return rt;
}

#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
					   struct net_device *dev,
					   struct flowi6 *fl6,
					   struct ip_tunnel_info *info)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct geneve_sock *gs6 = geneve->sock6;
	struct dst_entry *dst = NULL;
	__u8 prio;

	memset(fl6, 0, sizeof(*fl6));
	fl6->flowi6_mark = skb->mark;
	fl6->flowi6_proto = IPPROTO_UDP;

	if (info) {
		fl6->daddr = info->key.u.ipv6.dst;
		fl6->saddr = info->key.u.ipv6.src;
		fl6->flowi6_tos = RT_TOS(info->key.tos);
	} else {
		prio = geneve->tos;
		if (prio == 1) {
			const struct iphdr *iip = ip_hdr(skb);

			prio = ip_tunnel_get_dsfield(iip, skb);
		}

		fl6->flowi6_tos = RT_TOS(prio);
		fl6->daddr = geneve->remote.sin6.sin6_addr;
	}

	if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
		netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
		return ERR_PTR(-ENETUNREACH);
	}
	if (dst->dev == dev) { /* is this necessary? */
		netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
		dst_release(dst);
		return ERR_PTR(-ELOOP);
	}

	return dst;
}
#endif

/* Convert 64 bit tunnel ID to 24 bit VNI. */
static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
{
#ifdef __BIG_ENDIAN
	vni[0] = (__force __u8)(tun_id >> 16);
	vni[1] = (__force __u8)(tun_id >> 8);
	vni[2] = (__force __u8)tun_id;
#else
	vni[0] = (__force __u8)((__force u64)tun_id >> 40);
	vni[1] = (__force __u8)((__force u64)tun_id >> 48);
	vni[2] = (__force __u8)((__force u64)tun_id >> 56);
#endif
}

static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
				   struct ip_tunnel_info *info)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct geneve_sock *gs4 = geneve->sock4;
	struct rtable *rt = NULL;
	const struct iphdr *iip; /* interior IP header */
	int err = -EINVAL;
	struct flowi4 fl4;
	__u8 tos, ttl;
	__be16 sport;
	bool udp_csum;
	__be16 df;
	bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));

	if (geneve->collect_md) {
		if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
			netdev_dbg(dev, "no tunnel metadata\n");
			goto tx_error;
		}
		if (info && ip_tunnel_info_af(info) != AF_INET)
			goto tx_error;
	}

	rt = geneve_get_v4_rt(skb, dev, &fl4, info);
	if (IS_ERR(rt)) {
		err = PTR_ERR(rt);
		goto tx_error;
	}

	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
	skb_reset_mac_header(skb);

	iip = ip_hdr(skb);

	if (info) {
		const struct ip_tunnel_key *key = &info->key;
		u8 *opts = NULL;
		u8 vni[3];

		tunnel_id_to_vni(key->tun_id, vni);
		if (key->tun_flags & TUNNEL_GENEVE_OPT)
			opts = ip_tunnel_info_opts(info);

		udp_csum = !!(key->tun_flags & TUNNEL_CSUM);
		err = geneve_build_skb(rt, skb, key->tun_flags, vni,
				       info->options_len, opts, udp_csum, xnet);
		if (unlikely(err))
			goto err;

		tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
		ttl = key->ttl;
		df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
	} else {
		udp_csum = false;
		err = geneve_build_skb(rt, skb, 0, geneve->vni,
				       0, NULL, udp_csum, xnet);
		if (unlikely(err))
			goto err;

		tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
		ttl = geneve->ttl;
		if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
			ttl = 1;
		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
		df = 0;
	}
	err = udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
				  tos, ttl, df, sport, geneve->dst_port,
				  !net_eq(geneve->net, dev_net(geneve->dev)),
				  !udp_csum);

	iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
	return NETDEV_TX_OK;

tx_error:
	dev_kfree_skb(skb);
err:
	if (err == -ELOOP)
		dev->stats.collisions++;
	else if (err == -ENETUNREACH)
		dev->stats.tx_carrier_errors++;
	else
		dev->stats.tx_errors++;
	return NETDEV_TX_OK;
}

#if IS_ENABLED(CONFIG_IPV6)
static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
				    struct ip_tunnel_info *info)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct geneve_sock *gs6 = geneve->sock6;
	struct dst_entry *dst = NULL;
	const struct iphdr *iip; /* interior IP header */
	int err = -EINVAL;
	struct flowi6 fl6;
	__u8 prio, ttl;
	__be16 sport;
	bool udp_csum;
	bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));

	if (geneve->collect_md) {
		if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
			netdev_dbg(dev, "no tunnel metadata\n");
			goto tx_error;
		}
	}

	dst = geneve_get_v6_dst(skb, dev, &fl6, info);
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
		goto tx_error;
	}

	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
	skb_reset_mac_header(skb);

	iip = ip_hdr(skb);

	if (info) {
		const struct ip_tunnel_key *key = &info->key;
		u8 *opts = NULL;
		u8 vni[3];

		tunnel_id_to_vni(key->tun_id, vni);
		if (key->tun_flags & TUNNEL_GENEVE_OPT)
			opts = ip_tunnel_info_opts(info);

		udp_csum = !!(key->tun_flags & TUNNEL_CSUM);
		err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
					info->options_len, opts,
					udp_csum, xnet);
		if (unlikely(err))
			goto err;

		prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
		ttl = key->ttl;
	} else {
		udp_csum = false;
		err = geneve6_build_skb(dst, skb, 0, geneve->vni,
					0, NULL, udp_csum, xnet);
		if (unlikely(err))
			goto err;

		prio = ip_tunnel_ecn_encap(fl6.flowi6_tos, iip, skb);
		ttl = geneve->ttl;
		if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
			ttl = 1;
		ttl = ttl ? : ip6_dst_hoplimit(dst);
	}
	err = udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
				   &fl6.saddr, &fl6.daddr, prio, ttl,
				   sport, geneve->dst_port, !udp_csum);
	return NETDEV_TX_OK;

tx_error:
	dev_kfree_skb(skb);
err:
	if (err == -ELOOP)
		dev->stats.collisions++;
	else if (err == -ENETUNREACH)
		dev->stats.tx_carrier_errors++;
	else
		dev->stats.tx_errors++;
	return NETDEV_TX_OK;
}
#endif

static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	struct ip_tunnel_info *info = NULL;

	if (geneve->collect_md)
		info = skb_tunnel_info(skb);

#if IS_ENABLED(CONFIG_IPV6)
	if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
	    (!info && geneve->remote.sa.sa_family == AF_INET6))
		return geneve6_xmit_skb(skb, dev, info);
#endif
	return geneve_xmit_skb(skb, dev, info);
}

static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
	struct ip_tunnel_info *info = skb_tunnel_info(skb);
	struct geneve_dev *geneve = netdev_priv(dev);
	struct rtable *rt;
	struct flowi4 fl4;
#if IS_ENABLED(CONFIG_IPV6)
	struct dst_entry *dst;
	struct flowi6 fl6;
#endif

	if (ip_tunnel_info_af(info) == AF_INET) {
		rt = geneve_get_v4_rt(skb, dev, &fl4, info);
		if (IS_ERR(rt))
			return PTR_ERR(rt);

		ip_rt_put(rt);
		info->key.u.ipv4.src = fl4.saddr;
#if IS_ENABLED(CONFIG_IPV6)
	} else if (ip_tunnel_info_af(info) == AF_INET6) {
		dst = geneve_get_v6_dst(skb, dev, &fl6, info);
		if (IS_ERR(dst))
			return PTR_ERR(dst);

		dst_release(dst);
		info->key.u.ipv6.src = fl6.saddr;
#endif
	} else {
		return -EINVAL;
	}

	info->key.tp_src = udp_flow_src_port(geneve->net, skb,
					     1, USHRT_MAX, true);
	info->key.tp_dst = geneve->dst_port;
	return 0;
}

static const struct net_device_ops geneve_netdev_ops = {
	.ndo_init		= geneve_init,
	.ndo_uninit		= geneve_uninit,
	.ndo_open		= geneve_open,
	.ndo_stop		= geneve_stop,
	.ndo_start_xmit		= geneve_xmit,
	.ndo_get_stats64	= ip_tunnel_get_stats64,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_fill_metadata_dst	= geneve_fill_metadata_dst,
};

static void geneve_get_drvinfo(struct net_device *dev,
			       struct ethtool_drvinfo *drvinfo)
{
	strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
	strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
}

static const struct ethtool_ops geneve_ethtool_ops = {
	.get_drvinfo	= geneve_get_drvinfo,
	.get_link	= ethtool_op_get_link,
};

/* Info for udev, that this is a virtual tunnel endpoint */
static struct device_type geneve_type = {
	.name = "geneve",
};

/* Initialize the device structure. */
static void geneve_setup(struct net_device *dev)
{
	ether_setup(dev);

	dev->netdev_ops = &geneve_netdev_ops;
	dev->ethtool_ops = &geneve_ethtool_ops;
	dev->destructor = free_netdev;

	SET_NETDEV_DEVTYPE(dev, &geneve_type);

	dev->features    |= NETIF_F_LLTX;
	dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
	dev->features    |= NETIF_F_RXCSUM;
	dev->features    |= NETIF_F_GSO_SOFTWARE;

	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
	dev->hw_features |= NETIF_F_GSO_SOFTWARE;

	netif_keep_dst(dev);
	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
	eth_hw_addr_random(dev);
}

static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
	[IFLA_GENEVE_ID]		= { .type = NLA_U32 },
	[IFLA_GENEVE_REMOTE]		= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
	[IFLA_GENEVE_REMOTE6]		= { .len = sizeof(struct in6_addr) },
	[IFLA_GENEVE_TTL]		= { .type = NLA_U8 },
	[IFLA_GENEVE_TOS]		= { .type = NLA_U8 },
	[IFLA_GENEVE_PORT]		= { .type = NLA_U16 },
	[IFLA_GENEVE_COLLECT_METADATA]	= { .type = NLA_FLAG },
};

static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
{
	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
			return -EINVAL;

		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
			return -EADDRNOTAVAIL;
	}

	if (!data)
		return -EINVAL;

	if (data[IFLA_GENEVE_ID]) {
		__u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);

		if (vni >= GENEVE_VID_MASK)
			return -ERANGE;
	}

	return 0;
}

static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
					  __be16 dst_port,
					  union geneve_addr *remote,
					  u8 vni[],
					  bool *tun_on_same_port,
					  bool *tun_collect_md)
{
	struct geneve_dev *geneve, *t;

	*tun_on_same_port = false;
	*tun_collect_md = false;
	t = NULL;
	list_for_each_entry(geneve, &gn->geneve_list, next) {
		if (geneve->dst_port == dst_port) {
			*tun_collect_md = geneve->collect_md;
			*tun_on_same_port = true;
		}
		if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
		    !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
		    dst_port == geneve->dst_port)
			t = geneve;
	}
	return t;
}

static int geneve_configure(struct net *net, struct net_device *dev,
			    union geneve_addr *remote,
			    __u32 vni, __u8 ttl, __u8 tos, __be16 dst_port,
			    bool metadata)
{
	struct geneve_net *gn = net_generic(net, geneve_net_id);
	struct geneve_dev *t, *geneve = netdev_priv(dev);
	bool tun_collect_md, tun_on_same_port;
	int err;

	if (!remote)
		return -EINVAL;
	if (metadata &&
	    (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl))
		return -EINVAL;

	geneve->net = net;
	geneve->dev = dev;

	geneve->vni[0] = (vni & 0x00ff0000) >> 16;
	geneve->vni[1] = (vni & 0x0000ff00) >> 8;
	geneve->vni[2] =  vni & 0x000000ff;

	if ((remote->sa.sa_family == AF_INET &&
	     IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
	    (remote->sa.sa_family == AF_INET6 &&
	     ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
		return -EINVAL;
	geneve->remote = *remote;

	geneve->ttl = ttl;
	geneve->tos = tos;
	geneve->dst_port = dst_port;
	geneve->collect_md = metadata;

	t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
			    &tun_on_same_port, &tun_collect_md);
	if (t)
		return -EBUSY;

	if (metadata) {
		if (tun_on_same_port)
			return -EPERM;
	} else {
		if (tun_collect_md)
			return -EPERM;
	}

	err = register_netdevice(dev);
	if (err)
		return err;

	list_add(&geneve->next, &gn->geneve_list);
	return 0;
}

static int geneve_newlink(struct net *net, struct net_device *dev,
			  struct nlattr *tb[], struct nlattr *data[])
{
	__be16 dst_port = htons(GENEVE_UDP_PORT);
	__u8 ttl = 0, tos = 0;
	bool metadata = false;
	union geneve_addr remote = geneve_remote_unspec;
	__u32 vni = 0;

	if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
		return -EINVAL;

	if (data[IFLA_GENEVE_REMOTE]) {
		remote.sa.sa_family = AF_INET;
		remote.sin.sin_addr.s_addr =
			nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
	}

	if (data[IFLA_GENEVE_REMOTE6]) {
		if (!IS_ENABLED(CONFIG_IPV6))
			return -EPFNOSUPPORT;

		remote.sa.sa_family = AF_INET6;
		remote.sin6.sin6_addr =
			nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);

		if (ipv6_addr_type(&remote.sin6.sin6_addr) &
		    IPV6_ADDR_LINKLOCAL) {
			netdev_dbg(dev, "link-local remote is unsupported\n");
			return -EINVAL;
		}
	}

	if (data[IFLA_GENEVE_ID])
		vni = nla_get_u32(data[IFLA_GENEVE_ID]);

	if (data[IFLA_GENEVE_TTL])
		ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);

	if (data[IFLA_GENEVE_TOS])
		tos = nla_get_u8(data[IFLA_GENEVE_TOS]);

	if (data[IFLA_GENEVE_PORT])
		dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);

	if (data[IFLA_GENEVE_COLLECT_METADATA])
		metadata = true;

	return geneve_configure(net, dev, &remote, vni, ttl, tos, dst_port,
				metadata);
}

static void geneve_dellink(struct net_device *dev, struct list_head *head)
{
	struct geneve_dev *geneve = netdev_priv(dev);

	list_del(&geneve->next);
	unregister_netdevice_queue(dev, head);
}

static size_t geneve_get_size(const struct net_device *dev)
{
	return nla_total_size(sizeof(__u32)) +	/* IFLA_GENEVE_ID */
		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
		nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
		nla_total_size(0) +	 /* IFLA_GENEVE_COLLECT_METADATA */
		0;
}

static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct geneve_dev *geneve = netdev_priv(dev);
	__u32 vni;

	vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
	if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
		goto nla_put_failure;

	if (geneve->remote.sa.sa_family == AF_INET) {
		if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
				    geneve->remote.sin.sin_addr.s_addr))
			goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
	} else {
		if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
				     &geneve->remote.sin6.sin6_addr))
			goto nla_put_failure;
#endif
	}

	if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
	    nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
		goto nla_put_failure;

	if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
		goto nla_put_failure;

	if (geneve->collect_md) {
		if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
			goto nla_put_failure;
	}

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static struct rtnl_link_ops geneve_link_ops __read_mostly = {
	.kind		= "geneve",
	.maxtype	= IFLA_GENEVE_MAX,
	.policy		= geneve_policy,
	.priv_size	= sizeof(struct geneve_dev),
	.setup		= geneve_setup,
	.validate	= geneve_validate,
	.newlink	= geneve_newlink,
	.dellink	= geneve_dellink,
	.get_size	= geneve_get_size,
	.fill_info	= geneve_fill_info,
};

struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
					u8 name_assign_type, u16 dst_port)
{
	struct nlattr *tb[IFLA_MAX + 1];
	struct net_device *dev;
	int err;

	memset(tb, 0, sizeof(tb));
	dev = rtnl_create_link(net, name, name_assign_type,
			       &geneve_link_ops, tb);
	if (IS_ERR(dev))
		return dev;

	err = geneve_configure(net, dev, &geneve_remote_unspec,
			       0, 0, 0, htons(dst_port), true);
	if (err) {
		free_netdev(dev);
		return ERR_PTR(err);
	}
	return dev;
}
EXPORT_SYMBOL_GPL(geneve_dev_create_fb);

static __net_init int geneve_init_net(struct net *net)
{
	struct geneve_net *gn = net_generic(net, geneve_net_id);

	INIT_LIST_HEAD(&gn->geneve_list);
	INIT_LIST_HEAD(&gn->sock_list);
	return 0;
}

static void __net_exit geneve_exit_net(struct net *net)
{
	struct geneve_net *gn = net_generic(net, geneve_net_id);
	struct geneve_dev *geneve, *next;
	struct net_device *dev, *aux;
	LIST_HEAD(list);

	rtnl_lock();

	/* gather any geneve devices that were moved into this ns */
	for_each_netdev_safe(net, dev, aux)
		if (dev->rtnl_link_ops == &geneve_link_ops)
			unregister_netdevice_queue(dev, &list);

	/* now gather any other geneve devices that were created in this ns */
	list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
		/* If geneve->dev is in the same netns, it was already added
		 * to the list by the previous loop.
		 */
		if (!net_eq(dev_net(geneve->dev), net))
			unregister_netdevice_queue(geneve->dev, &list);
	}

	/* unregister the devices gathered above */
	unregister_netdevice_many(&list);
	rtnl_unlock();
}

static struct pernet_operations geneve_net_ops = {
	.init = geneve_init_net,
	.exit = geneve_exit_net,
	.id   = &geneve_net_id,
	.size = sizeof(struct geneve_net),
};

static int __init geneve_init_module(void)
{
	int rc;

	rc = register_pernet_subsys(&geneve_net_ops);
	if (rc)
		goto out1;

	rc = rtnl_link_register(&geneve_link_ops);
	if (rc)
		goto out2;

	return 0;
out2:
	unregister_pernet_subsys(&geneve_net_ops);
out1:
	return rc;
}
late_initcall(geneve_init_module);

static void __exit geneve_cleanup_module(void)
{
	rtnl_link_unregister(&geneve_link_ops);
	unregister_pernet_subsys(&geneve_net_ops);
}
module_exit(geneve_cleanup_module);

MODULE_LICENSE("GPL");
MODULE_VERSION(GENEVE_NETDEV_VER);
MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
MODULE_ALIAS_RTNL_LINK("geneve");