xref: /openbmc/linux/drivers/net/geneve.c (revision b296a6d5)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * GENEVE: Generic Network Virtualization Encapsulation
4  *
5  * Copyright (c) 2015 Red Hat, Inc.
6  */
7 
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/etherdevice.h>
13 #include <linux/hash.h>
14 #include <net/ipv6_stubs.h>
15 #include <net/dst_metadata.h>
16 #include <net/gro_cells.h>
17 #include <net/rtnetlink.h>
18 #include <net/geneve.h>
19 #include <net/protocol.h>
20 
21 #define GENEVE_NETDEV_VER	"0.6"
22 
23 #define GENEVE_N_VID		(1u << 24)
24 #define GENEVE_VID_MASK		(GENEVE_N_VID - 1)
25 
26 #define VNI_HASH_BITS		10
27 #define VNI_HASH_SIZE		(1<<VNI_HASH_BITS)
28 
29 static bool log_ecn_error = true;
30 module_param(log_ecn_error, bool, 0644);
31 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
32 
33 #define GENEVE_VER 0
34 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
35 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
36 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
37 
38 /* per-network namespace private data for this module */
39 struct geneve_net {
40 	struct list_head	geneve_list;
41 	struct list_head	sock_list;
42 };
43 
44 static unsigned int geneve_net_id;
45 
46 struct geneve_dev_node {
47 	struct hlist_node hlist;
48 	struct geneve_dev *geneve;
49 };
50 
51 struct geneve_config {
52 	struct ip_tunnel_info	info;
53 	bool			collect_md;
54 	bool			use_udp6_rx_checksums;
55 	bool			ttl_inherit;
56 	enum ifla_geneve_df	df;
57 };
58 
59 /* Pseudo network device */
60 struct geneve_dev {
61 	struct geneve_dev_node hlist4;	/* vni hash table for IPv4 socket */
62 #if IS_ENABLED(CONFIG_IPV6)
63 	struct geneve_dev_node hlist6;	/* vni hash table for IPv6 socket */
64 #endif
65 	struct net	   *net;	/* netns for packet i/o */
66 	struct net_device  *dev;	/* netdev for geneve tunnel */
67 	struct geneve_sock __rcu *sock4;	/* IPv4 socket used for geneve tunnel */
68 #if IS_ENABLED(CONFIG_IPV6)
69 	struct geneve_sock __rcu *sock6;	/* IPv6 socket used for geneve tunnel */
70 #endif
71 	struct list_head   next;	/* geneve's per namespace list */
72 	struct gro_cells   gro_cells;
73 	struct geneve_config cfg;
74 };
75 
76 struct geneve_sock {
77 	bool			collect_md;
78 	struct list_head	list;
79 	struct socket		*sock;
80 	struct rcu_head		rcu;
81 	int			refcnt;
82 	struct hlist_head	vni_list[VNI_HASH_SIZE];
83 };
84 
85 static inline __u32 geneve_net_vni_hash(u8 vni[3])
86 {
87 	__u32 vnid;
88 
89 	vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
90 	return hash_32(vnid, VNI_HASH_BITS);
91 }
92 
93 static __be64 vni_to_tunnel_id(const __u8 *vni)
94 {
95 #ifdef __BIG_ENDIAN
96 	return (vni[0] << 16) | (vni[1] << 8) | vni[2];
97 #else
98 	return (__force __be64)(((__force u64)vni[0] << 40) |
99 				((__force u64)vni[1] << 48) |
100 				((__force u64)vni[2] << 56));
101 #endif
102 }
103 
104 /* Convert 64 bit tunnel ID to 24 bit VNI. */
105 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
106 {
107 #ifdef __BIG_ENDIAN
108 	vni[0] = (__force __u8)(tun_id >> 16);
109 	vni[1] = (__force __u8)(tun_id >> 8);
110 	vni[2] = (__force __u8)tun_id;
111 #else
112 	vni[0] = (__force __u8)((__force u64)tun_id >> 40);
113 	vni[1] = (__force __u8)((__force u64)tun_id >> 48);
114 	vni[2] = (__force __u8)((__force u64)tun_id >> 56);
115 #endif
116 }
117 
118 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
119 {
120 	return !memcmp(vni, &tun_id[5], 3);
121 }
122 
123 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
124 {
125 	return gs->sock->sk->sk_family;
126 }
127 
128 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
129 					__be32 addr, u8 vni[])
130 {
131 	struct hlist_head *vni_list_head;
132 	struct geneve_dev_node *node;
133 	__u32 hash;
134 
135 	/* Find the device for this VNI */
136 	hash = geneve_net_vni_hash(vni);
137 	vni_list_head = &gs->vni_list[hash];
138 	hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
139 		if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
140 		    addr == node->geneve->cfg.info.key.u.ipv4.dst)
141 			return node->geneve;
142 	}
143 	return NULL;
144 }
145 
146 #if IS_ENABLED(CONFIG_IPV6)
147 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
148 					 struct in6_addr addr6, u8 vni[])
149 {
150 	struct hlist_head *vni_list_head;
151 	struct geneve_dev_node *node;
152 	__u32 hash;
153 
154 	/* Find the device for this VNI */
155 	hash = geneve_net_vni_hash(vni);
156 	vni_list_head = &gs->vni_list[hash];
157 	hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
158 		if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
159 		    ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
160 			return node->geneve;
161 	}
162 	return NULL;
163 }
164 #endif
165 
166 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
167 {
168 	return (struct genevehdr *)(udp_hdr(skb) + 1);
169 }
170 
171 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
172 					    struct sk_buff *skb)
173 {
174 	static u8 zero_vni[3];
175 	u8 *vni;
176 
177 	if (geneve_get_sk_family(gs) == AF_INET) {
178 		struct iphdr *iph;
179 		__be32 addr;
180 
181 		iph = ip_hdr(skb); /* outer IP header... */
182 
183 		if (gs->collect_md) {
184 			vni = zero_vni;
185 			addr = 0;
186 		} else {
187 			vni = geneve_hdr(skb)->vni;
188 			addr = iph->saddr;
189 		}
190 
191 		return geneve_lookup(gs, addr, vni);
192 #if IS_ENABLED(CONFIG_IPV6)
193 	} else if (geneve_get_sk_family(gs) == AF_INET6) {
194 		static struct in6_addr zero_addr6;
195 		struct ipv6hdr *ip6h;
196 		struct in6_addr addr6;
197 
198 		ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
199 
200 		if (gs->collect_md) {
201 			vni = zero_vni;
202 			addr6 = zero_addr6;
203 		} else {
204 			vni = geneve_hdr(skb)->vni;
205 			addr6 = ip6h->saddr;
206 		}
207 
208 		return geneve6_lookup(gs, addr6, vni);
209 #endif
210 	}
211 	return NULL;
212 }
213 
214 /* geneve receive/decap routine */
215 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
216 		      struct sk_buff *skb)
217 {
218 	struct genevehdr *gnvh = geneve_hdr(skb);
219 	struct metadata_dst *tun_dst = NULL;
220 	struct pcpu_sw_netstats *stats;
221 	unsigned int len;
222 	int err = 0;
223 	void *oiph;
224 
225 	if (ip_tunnel_collect_metadata() || gs->collect_md) {
226 		__be16 flags;
227 
228 		flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
229 			(gnvh->oam ? TUNNEL_OAM : 0) |
230 			(gnvh->critical ? TUNNEL_CRIT_OPT : 0);
231 
232 		tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
233 					 vni_to_tunnel_id(gnvh->vni),
234 					 gnvh->opt_len * 4);
235 		if (!tun_dst) {
236 			geneve->dev->stats.rx_dropped++;
237 			goto drop;
238 		}
239 		/* Update tunnel dst according to Geneve options. */
240 		ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
241 					gnvh->options, gnvh->opt_len * 4,
242 					TUNNEL_GENEVE_OPT);
243 	} else {
244 		/* Drop packets w/ critical options,
245 		 * since we don't support any...
246 		 */
247 		if (gnvh->critical) {
248 			geneve->dev->stats.rx_frame_errors++;
249 			geneve->dev->stats.rx_errors++;
250 			goto drop;
251 		}
252 	}
253 
254 	skb_reset_mac_header(skb);
255 	skb->protocol = eth_type_trans(skb, geneve->dev);
256 	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
257 
258 	if (tun_dst)
259 		skb_dst_set(skb, &tun_dst->dst);
260 
261 	/* Ignore packet loops (and multicast echo) */
262 	if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
263 		geneve->dev->stats.rx_errors++;
264 		goto drop;
265 	}
266 
267 	oiph = skb_network_header(skb);
268 	skb_reset_network_header(skb);
269 
270 	if (geneve_get_sk_family(gs) == AF_INET)
271 		err = IP_ECN_decapsulate(oiph, skb);
272 #if IS_ENABLED(CONFIG_IPV6)
273 	else
274 		err = IP6_ECN_decapsulate(oiph, skb);
275 #endif
276 
277 	if (unlikely(err)) {
278 		if (log_ecn_error) {
279 			if (geneve_get_sk_family(gs) == AF_INET)
280 				net_info_ratelimited("non-ECT from %pI4 "
281 						     "with TOS=%#x\n",
282 						     &((struct iphdr *)oiph)->saddr,
283 						     ((struct iphdr *)oiph)->tos);
284 #if IS_ENABLED(CONFIG_IPV6)
285 			else
286 				net_info_ratelimited("non-ECT from %pI6\n",
287 						     &((struct ipv6hdr *)oiph)->saddr);
288 #endif
289 		}
290 		if (err > 1) {
291 			++geneve->dev->stats.rx_frame_errors;
292 			++geneve->dev->stats.rx_errors;
293 			goto drop;
294 		}
295 	}
296 
297 	len = skb->len;
298 	err = gro_cells_receive(&geneve->gro_cells, skb);
299 	if (likely(err == NET_RX_SUCCESS)) {
300 		stats = this_cpu_ptr(geneve->dev->tstats);
301 		u64_stats_update_begin(&stats->syncp);
302 		stats->rx_packets++;
303 		stats->rx_bytes += len;
304 		u64_stats_update_end(&stats->syncp);
305 	}
306 	return;
307 drop:
308 	/* Consume bad packet */
309 	kfree_skb(skb);
310 }
311 
312 /* Setup stats when device is created */
313 static int geneve_init(struct net_device *dev)
314 {
315 	struct geneve_dev *geneve = netdev_priv(dev);
316 	int err;
317 
318 	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
319 	if (!dev->tstats)
320 		return -ENOMEM;
321 
322 	err = gro_cells_init(&geneve->gro_cells, dev);
323 	if (err) {
324 		free_percpu(dev->tstats);
325 		return err;
326 	}
327 
328 	err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
329 	if (err) {
330 		free_percpu(dev->tstats);
331 		gro_cells_destroy(&geneve->gro_cells);
332 		return err;
333 	}
334 	return 0;
335 }
336 
337 static void geneve_uninit(struct net_device *dev)
338 {
339 	struct geneve_dev *geneve = netdev_priv(dev);
340 
341 	dst_cache_destroy(&geneve->cfg.info.dst_cache);
342 	gro_cells_destroy(&geneve->gro_cells);
343 	free_percpu(dev->tstats);
344 }
345 
346 /* Callback from net/ipv4/udp.c to receive packets */
347 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
348 {
349 	struct genevehdr *geneveh;
350 	struct geneve_dev *geneve;
351 	struct geneve_sock *gs;
352 	int opts_len;
353 
354 	/* Need UDP and Geneve header to be present */
355 	if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
356 		goto drop;
357 
358 	/* Return packets with reserved bits set */
359 	geneveh = geneve_hdr(skb);
360 	if (unlikely(geneveh->ver != GENEVE_VER))
361 		goto drop;
362 
363 	if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
364 		goto drop;
365 
366 	gs = rcu_dereference_sk_user_data(sk);
367 	if (!gs)
368 		goto drop;
369 
370 	geneve = geneve_lookup_skb(gs, skb);
371 	if (!geneve)
372 		goto drop;
373 
374 	opts_len = geneveh->opt_len * 4;
375 	if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
376 				 htons(ETH_P_TEB),
377 				 !net_eq(geneve->net, dev_net(geneve->dev)))) {
378 		geneve->dev->stats.rx_dropped++;
379 		goto drop;
380 	}
381 
382 	geneve_rx(geneve, gs, skb);
383 	return 0;
384 
385 drop:
386 	/* Consume bad packet */
387 	kfree_skb(skb);
388 	return 0;
389 }
390 
391 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
392 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
393 {
394 	struct genevehdr *geneveh;
395 	struct geneve_sock *gs;
396 	u8 zero_vni[3] = { 0 };
397 	u8 *vni = zero_vni;
398 
399 	if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
400 		return -EINVAL;
401 
402 	geneveh = geneve_hdr(skb);
403 	if (geneveh->ver != GENEVE_VER)
404 		return -EINVAL;
405 
406 	if (geneveh->proto_type != htons(ETH_P_TEB))
407 		return -EINVAL;
408 
409 	gs = rcu_dereference_sk_user_data(sk);
410 	if (!gs)
411 		return -ENOENT;
412 
413 	if (geneve_get_sk_family(gs) == AF_INET) {
414 		struct iphdr *iph = ip_hdr(skb);
415 		__be32 addr4 = 0;
416 
417 		if (!gs->collect_md) {
418 			vni = geneve_hdr(skb)->vni;
419 			addr4 = iph->daddr;
420 		}
421 
422 		return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
423 	}
424 
425 #if IS_ENABLED(CONFIG_IPV6)
426 	if (geneve_get_sk_family(gs) == AF_INET6) {
427 		struct ipv6hdr *ip6h = ipv6_hdr(skb);
428 		struct in6_addr addr6;
429 
430 		memset(&addr6, 0, sizeof(struct in6_addr));
431 
432 		if (!gs->collect_md) {
433 			vni = geneve_hdr(skb)->vni;
434 			addr6 = ip6h->daddr;
435 		}
436 
437 		return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
438 	}
439 #endif
440 
441 	return -EPFNOSUPPORT;
442 }
443 
444 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
445 					 __be16 port, bool ipv6_rx_csum)
446 {
447 	struct socket *sock;
448 	struct udp_port_cfg udp_conf;
449 	int err;
450 
451 	memset(&udp_conf, 0, sizeof(udp_conf));
452 
453 	if (ipv6) {
454 		udp_conf.family = AF_INET6;
455 		udp_conf.ipv6_v6only = 1;
456 		udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
457 	} else {
458 		udp_conf.family = AF_INET;
459 		udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
460 	}
461 
462 	udp_conf.local_udp_port = port;
463 
464 	/* Open UDP socket */
465 	err = udp_sock_create(net, &udp_conf, &sock);
466 	if (err < 0)
467 		return ERR_PTR(err);
468 
469 	return sock;
470 }
471 
472 static int geneve_hlen(struct genevehdr *gh)
473 {
474 	return sizeof(*gh) + gh->opt_len * 4;
475 }
476 
477 static struct sk_buff *geneve_gro_receive(struct sock *sk,
478 					  struct list_head *head,
479 					  struct sk_buff *skb)
480 {
481 	struct sk_buff *pp = NULL;
482 	struct sk_buff *p;
483 	struct genevehdr *gh, *gh2;
484 	unsigned int hlen, gh_len, off_gnv;
485 	const struct packet_offload *ptype;
486 	__be16 type;
487 	int flush = 1;
488 
489 	off_gnv = skb_gro_offset(skb);
490 	hlen = off_gnv + sizeof(*gh);
491 	gh = skb_gro_header_fast(skb, off_gnv);
492 	if (skb_gro_header_hard(skb, hlen)) {
493 		gh = skb_gro_header_slow(skb, hlen, off_gnv);
494 		if (unlikely(!gh))
495 			goto out;
496 	}
497 
498 	if (gh->ver != GENEVE_VER || gh->oam)
499 		goto out;
500 	gh_len = geneve_hlen(gh);
501 
502 	hlen = off_gnv + gh_len;
503 	if (skb_gro_header_hard(skb, hlen)) {
504 		gh = skb_gro_header_slow(skb, hlen, off_gnv);
505 		if (unlikely(!gh))
506 			goto out;
507 	}
508 
509 	list_for_each_entry(p, head, list) {
510 		if (!NAPI_GRO_CB(p)->same_flow)
511 			continue;
512 
513 		gh2 = (struct genevehdr *)(p->data + off_gnv);
514 		if (gh->opt_len != gh2->opt_len ||
515 		    memcmp(gh, gh2, gh_len)) {
516 			NAPI_GRO_CB(p)->same_flow = 0;
517 			continue;
518 		}
519 	}
520 
521 	type = gh->proto_type;
522 
523 	rcu_read_lock();
524 	ptype = gro_find_receive_by_type(type);
525 	if (!ptype)
526 		goto out_unlock;
527 
528 	skb_gro_pull(skb, gh_len);
529 	skb_gro_postpull_rcsum(skb, gh, gh_len);
530 	pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
531 	flush = 0;
532 
533 out_unlock:
534 	rcu_read_unlock();
535 out:
536 	skb_gro_flush_final(skb, pp, flush);
537 
538 	return pp;
539 }
540 
541 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
542 			       int nhoff)
543 {
544 	struct genevehdr *gh;
545 	struct packet_offload *ptype;
546 	__be16 type;
547 	int gh_len;
548 	int err = -ENOSYS;
549 
550 	gh = (struct genevehdr *)(skb->data + nhoff);
551 	gh_len = geneve_hlen(gh);
552 	type = gh->proto_type;
553 
554 	rcu_read_lock();
555 	ptype = gro_find_complete_by_type(type);
556 	if (ptype)
557 		err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
558 
559 	rcu_read_unlock();
560 
561 	skb_set_inner_mac_header(skb, nhoff + gh_len);
562 
563 	return err;
564 }
565 
566 /* Create new listen socket if needed */
567 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
568 						bool ipv6, bool ipv6_rx_csum)
569 {
570 	struct geneve_net *gn = net_generic(net, geneve_net_id);
571 	struct geneve_sock *gs;
572 	struct socket *sock;
573 	struct udp_tunnel_sock_cfg tunnel_cfg;
574 	int h;
575 
576 	gs = kzalloc(sizeof(*gs), GFP_KERNEL);
577 	if (!gs)
578 		return ERR_PTR(-ENOMEM);
579 
580 	sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
581 	if (IS_ERR(sock)) {
582 		kfree(gs);
583 		return ERR_CAST(sock);
584 	}
585 
586 	gs->sock = sock;
587 	gs->refcnt = 1;
588 	for (h = 0; h < VNI_HASH_SIZE; ++h)
589 		INIT_HLIST_HEAD(&gs->vni_list[h]);
590 
591 	/* Initialize the geneve udp offloads structure */
592 	udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
593 
594 	/* Mark socket as an encapsulation socket */
595 	memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
596 	tunnel_cfg.sk_user_data = gs;
597 	tunnel_cfg.encap_type = 1;
598 	tunnel_cfg.gro_receive = geneve_gro_receive;
599 	tunnel_cfg.gro_complete = geneve_gro_complete;
600 	tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
601 	tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
602 	tunnel_cfg.encap_destroy = NULL;
603 	setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
604 	list_add(&gs->list, &gn->sock_list);
605 	return gs;
606 }
607 
608 static void __geneve_sock_release(struct geneve_sock *gs)
609 {
610 	if (!gs || --gs->refcnt)
611 		return;
612 
613 	list_del(&gs->list);
614 	udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
615 	udp_tunnel_sock_release(gs->sock);
616 	kfree_rcu(gs, rcu);
617 }
618 
619 static void geneve_sock_release(struct geneve_dev *geneve)
620 {
621 	struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
622 #if IS_ENABLED(CONFIG_IPV6)
623 	struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
624 
625 	rcu_assign_pointer(geneve->sock6, NULL);
626 #endif
627 
628 	rcu_assign_pointer(geneve->sock4, NULL);
629 	synchronize_net();
630 
631 	__geneve_sock_release(gs4);
632 #if IS_ENABLED(CONFIG_IPV6)
633 	__geneve_sock_release(gs6);
634 #endif
635 }
636 
637 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
638 					    sa_family_t family,
639 					    __be16 dst_port)
640 {
641 	struct geneve_sock *gs;
642 
643 	list_for_each_entry(gs, &gn->sock_list, list) {
644 		if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
645 		    geneve_get_sk_family(gs) == family) {
646 			return gs;
647 		}
648 	}
649 	return NULL;
650 }
651 
652 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
653 {
654 	struct net *net = geneve->net;
655 	struct geneve_net *gn = net_generic(net, geneve_net_id);
656 	struct geneve_dev_node *node;
657 	struct geneve_sock *gs;
658 	__u8 vni[3];
659 	__u32 hash;
660 
661 	gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
662 	if (gs) {
663 		gs->refcnt++;
664 		goto out;
665 	}
666 
667 	gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
668 				  geneve->cfg.use_udp6_rx_checksums);
669 	if (IS_ERR(gs))
670 		return PTR_ERR(gs);
671 
672 out:
673 	gs->collect_md = geneve->cfg.collect_md;
674 #if IS_ENABLED(CONFIG_IPV6)
675 	if (ipv6) {
676 		rcu_assign_pointer(geneve->sock6, gs);
677 		node = &geneve->hlist6;
678 	} else
679 #endif
680 	{
681 		rcu_assign_pointer(geneve->sock4, gs);
682 		node = &geneve->hlist4;
683 	}
684 	node->geneve = geneve;
685 
686 	tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
687 	hash = geneve_net_vni_hash(vni);
688 	hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
689 	return 0;
690 }
691 
692 static int geneve_open(struct net_device *dev)
693 {
694 	struct geneve_dev *geneve = netdev_priv(dev);
695 	bool metadata = geneve->cfg.collect_md;
696 	bool ipv4, ipv6;
697 	int ret = 0;
698 
699 	ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
700 	ipv4 = !ipv6 || metadata;
701 #if IS_ENABLED(CONFIG_IPV6)
702 	if (ipv6) {
703 		ret = geneve_sock_add(geneve, true);
704 		if (ret < 0 && ret != -EAFNOSUPPORT)
705 			ipv4 = false;
706 	}
707 #endif
708 	if (ipv4)
709 		ret = geneve_sock_add(geneve, false);
710 	if (ret < 0)
711 		geneve_sock_release(geneve);
712 
713 	return ret;
714 }
715 
716 static int geneve_stop(struct net_device *dev)
717 {
718 	struct geneve_dev *geneve = netdev_priv(dev);
719 
720 	hlist_del_init_rcu(&geneve->hlist4.hlist);
721 #if IS_ENABLED(CONFIG_IPV6)
722 	hlist_del_init_rcu(&geneve->hlist6.hlist);
723 #endif
724 	geneve_sock_release(geneve);
725 	return 0;
726 }
727 
728 static void geneve_build_header(struct genevehdr *geneveh,
729 				const struct ip_tunnel_info *info)
730 {
731 	geneveh->ver = GENEVE_VER;
732 	geneveh->opt_len = info->options_len / 4;
733 	geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
734 	geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
735 	geneveh->rsvd1 = 0;
736 	tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
737 	geneveh->proto_type = htons(ETH_P_TEB);
738 	geneveh->rsvd2 = 0;
739 
740 	if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
741 		ip_tunnel_info_opts_get(geneveh->options, info);
742 }
743 
744 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
745 			    const struct ip_tunnel_info *info,
746 			    bool xnet, int ip_hdr_len)
747 {
748 	bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
749 	struct genevehdr *gnvh;
750 	int min_headroom;
751 	int err;
752 
753 	skb_reset_mac_header(skb);
754 	skb_scrub_packet(skb, xnet);
755 
756 	min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
757 		       GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
758 	err = skb_cow_head(skb, min_headroom);
759 	if (unlikely(err))
760 		goto free_dst;
761 
762 	err = udp_tunnel_handle_offloads(skb, udp_sum);
763 	if (err)
764 		goto free_dst;
765 
766 	gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
767 	geneve_build_header(gnvh, info);
768 	skb_set_inner_protocol(skb, htons(ETH_P_TEB));
769 	return 0;
770 
771 free_dst:
772 	dst_release(dst);
773 	return err;
774 }
775 
776 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
777 				       struct net_device *dev,
778 				       struct geneve_sock *gs4,
779 				       struct flowi4 *fl4,
780 				       const struct ip_tunnel_info *info,
781 				       __be16 dport, __be16 sport)
782 {
783 	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
784 	struct geneve_dev *geneve = netdev_priv(dev);
785 	struct dst_cache *dst_cache;
786 	struct rtable *rt = NULL;
787 	__u8 tos;
788 
789 	if (!gs4)
790 		return ERR_PTR(-EIO);
791 
792 	memset(fl4, 0, sizeof(*fl4));
793 	fl4->flowi4_mark = skb->mark;
794 	fl4->flowi4_proto = IPPROTO_UDP;
795 	fl4->daddr = info->key.u.ipv4.dst;
796 	fl4->saddr = info->key.u.ipv4.src;
797 	fl4->fl4_dport = dport;
798 	fl4->fl4_sport = sport;
799 
800 	tos = info->key.tos;
801 	if ((tos == 1) && !geneve->cfg.collect_md) {
802 		tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
803 		use_cache = false;
804 	}
805 	fl4->flowi4_tos = RT_TOS(tos);
806 
807 	dst_cache = (struct dst_cache *)&info->dst_cache;
808 	if (use_cache) {
809 		rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
810 		if (rt)
811 			return rt;
812 	}
813 	rt = ip_route_output_key(geneve->net, fl4);
814 	if (IS_ERR(rt)) {
815 		netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
816 		return ERR_PTR(-ENETUNREACH);
817 	}
818 	if (rt->dst.dev == dev) { /* is this necessary? */
819 		netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
820 		ip_rt_put(rt);
821 		return ERR_PTR(-ELOOP);
822 	}
823 	if (use_cache)
824 		dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
825 	return rt;
826 }
827 
828 #if IS_ENABLED(CONFIG_IPV6)
829 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
830 					   struct net_device *dev,
831 					   struct geneve_sock *gs6,
832 					   struct flowi6 *fl6,
833 					   const struct ip_tunnel_info *info,
834 					   __be16 dport, __be16 sport)
835 {
836 	bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
837 	struct geneve_dev *geneve = netdev_priv(dev);
838 	struct dst_entry *dst = NULL;
839 	struct dst_cache *dst_cache;
840 	__u8 prio;
841 
842 	if (!gs6)
843 		return ERR_PTR(-EIO);
844 
845 	memset(fl6, 0, sizeof(*fl6));
846 	fl6->flowi6_mark = skb->mark;
847 	fl6->flowi6_proto = IPPROTO_UDP;
848 	fl6->daddr = info->key.u.ipv6.dst;
849 	fl6->saddr = info->key.u.ipv6.src;
850 	fl6->fl6_dport = dport;
851 	fl6->fl6_sport = sport;
852 
853 	prio = info->key.tos;
854 	if ((prio == 1) && !geneve->cfg.collect_md) {
855 		prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
856 		use_cache = false;
857 	}
858 
859 	fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
860 					   info->key.label);
861 	dst_cache = (struct dst_cache *)&info->dst_cache;
862 	if (use_cache) {
863 		dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
864 		if (dst)
865 			return dst;
866 	}
867 	dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
868 					      NULL);
869 	if (IS_ERR(dst)) {
870 		netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
871 		return ERR_PTR(-ENETUNREACH);
872 	}
873 	if (dst->dev == dev) { /* is this necessary? */
874 		netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
875 		dst_release(dst);
876 		return ERR_PTR(-ELOOP);
877 	}
878 
879 	if (use_cache)
880 		dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
881 	return dst;
882 }
883 #endif
884 
885 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
886 			   struct geneve_dev *geneve,
887 			   const struct ip_tunnel_info *info)
888 {
889 	bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
890 	struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
891 	const struct ip_tunnel_key *key = &info->key;
892 	struct rtable *rt;
893 	struct flowi4 fl4;
894 	__u8 tos, ttl;
895 	__be16 df = 0;
896 	__be16 sport;
897 	int err;
898 
899 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
900 	rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
901 			      geneve->cfg.info.key.tp_dst, sport);
902 	if (IS_ERR(rt))
903 		return PTR_ERR(rt);
904 
905 	err = skb_tunnel_check_pmtu(skb, &rt->dst,
906 				    GENEVE_IPV4_HLEN + info->options_len,
907 				    netif_is_any_bridge_port(dev));
908 	if (err < 0) {
909 		dst_release(&rt->dst);
910 		return err;
911 	} else if (err) {
912 		struct ip_tunnel_info *info;
913 
914 		info = skb_tunnel_info(skb);
915 		if (info) {
916 			info->key.u.ipv4.dst = fl4.saddr;
917 			info->key.u.ipv4.src = fl4.daddr;
918 		}
919 
920 		if (!pskb_may_pull(skb, ETH_HLEN)) {
921 			dst_release(&rt->dst);
922 			return -EINVAL;
923 		}
924 
925 		skb->protocol = eth_type_trans(skb, geneve->dev);
926 		netif_rx(skb);
927 		dst_release(&rt->dst);
928 		return -EMSGSIZE;
929 	}
930 
931 	if (geneve->cfg.collect_md) {
932 		tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
933 		ttl = key->ttl;
934 
935 		df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
936 	} else {
937 		tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
938 		if (geneve->cfg.ttl_inherit)
939 			ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
940 		else
941 			ttl = key->ttl;
942 		ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
943 
944 		if (geneve->cfg.df == GENEVE_DF_SET) {
945 			df = htons(IP_DF);
946 		} else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
947 			struct ethhdr *eth = eth_hdr(skb);
948 
949 			if (ntohs(eth->h_proto) == ETH_P_IPV6) {
950 				df = htons(IP_DF);
951 			} else if (ntohs(eth->h_proto) == ETH_P_IP) {
952 				struct iphdr *iph = ip_hdr(skb);
953 
954 				if (iph->frag_off & htons(IP_DF))
955 					df = htons(IP_DF);
956 			}
957 		}
958 	}
959 
960 	err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
961 	if (unlikely(err))
962 		return err;
963 
964 	udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
965 			    tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
966 			    !net_eq(geneve->net, dev_net(geneve->dev)),
967 			    !(info->key.tun_flags & TUNNEL_CSUM));
968 	return 0;
969 }
970 
971 #if IS_ENABLED(CONFIG_IPV6)
972 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
973 			    struct geneve_dev *geneve,
974 			    const struct ip_tunnel_info *info)
975 {
976 	bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
977 	struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
978 	const struct ip_tunnel_key *key = &info->key;
979 	struct dst_entry *dst = NULL;
980 	struct flowi6 fl6;
981 	__u8 prio, ttl;
982 	__be16 sport;
983 	int err;
984 
985 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
986 	dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
987 				geneve->cfg.info.key.tp_dst, sport);
988 	if (IS_ERR(dst))
989 		return PTR_ERR(dst);
990 
991 	err = skb_tunnel_check_pmtu(skb, dst,
992 				    GENEVE_IPV6_HLEN + info->options_len,
993 				    netif_is_any_bridge_port(dev));
994 	if (err < 0) {
995 		dst_release(dst);
996 		return err;
997 	} else if (err) {
998 		struct ip_tunnel_info *info = skb_tunnel_info(skb);
999 
1000 		if (info) {
1001 			info->key.u.ipv6.dst = fl6.saddr;
1002 			info->key.u.ipv6.src = fl6.daddr;
1003 		}
1004 
1005 		if (!pskb_may_pull(skb, ETH_HLEN)) {
1006 			dst_release(dst);
1007 			return -EINVAL;
1008 		}
1009 
1010 		skb->protocol = eth_type_trans(skb, geneve->dev);
1011 		netif_rx(skb);
1012 		dst_release(dst);
1013 		return -EMSGSIZE;
1014 	}
1015 
1016 	if (geneve->cfg.collect_md) {
1017 		prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1018 		ttl = key->ttl;
1019 	} else {
1020 		prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1021 					   ip_hdr(skb), skb);
1022 		if (geneve->cfg.ttl_inherit)
1023 			ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1024 		else
1025 			ttl = key->ttl;
1026 		ttl = ttl ? : ip6_dst_hoplimit(dst);
1027 	}
1028 	err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1029 	if (unlikely(err))
1030 		return err;
1031 
1032 	udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1033 			     &fl6.saddr, &fl6.daddr, prio, ttl,
1034 			     info->key.label, sport, geneve->cfg.info.key.tp_dst,
1035 			     !(info->key.tun_flags & TUNNEL_CSUM));
1036 	return 0;
1037 }
1038 #endif
1039 
1040 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1041 {
1042 	struct geneve_dev *geneve = netdev_priv(dev);
1043 	struct ip_tunnel_info *info = NULL;
1044 	int err;
1045 
1046 	if (geneve->cfg.collect_md) {
1047 		info = skb_tunnel_info(skb);
1048 		if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1049 			netdev_dbg(dev, "no tunnel metadata\n");
1050 			dev_kfree_skb(skb);
1051 			dev->stats.tx_dropped++;
1052 			return NETDEV_TX_OK;
1053 		}
1054 	} else {
1055 		info = &geneve->cfg.info;
1056 	}
1057 
1058 	rcu_read_lock();
1059 #if IS_ENABLED(CONFIG_IPV6)
1060 	if (info->mode & IP_TUNNEL_INFO_IPV6)
1061 		err = geneve6_xmit_skb(skb, dev, geneve, info);
1062 	else
1063 #endif
1064 		err = geneve_xmit_skb(skb, dev, geneve, info);
1065 	rcu_read_unlock();
1066 
1067 	if (likely(!err))
1068 		return NETDEV_TX_OK;
1069 
1070 	if (err != -EMSGSIZE)
1071 		dev_kfree_skb(skb);
1072 
1073 	if (err == -ELOOP)
1074 		dev->stats.collisions++;
1075 	else if (err == -ENETUNREACH)
1076 		dev->stats.tx_carrier_errors++;
1077 
1078 	dev->stats.tx_errors++;
1079 	return NETDEV_TX_OK;
1080 }
1081 
1082 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1083 {
1084 	if (new_mtu > dev->max_mtu)
1085 		new_mtu = dev->max_mtu;
1086 	else if (new_mtu < dev->min_mtu)
1087 		new_mtu = dev->min_mtu;
1088 
1089 	dev->mtu = new_mtu;
1090 	return 0;
1091 }
1092 
1093 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1094 {
1095 	struct ip_tunnel_info *info = skb_tunnel_info(skb);
1096 	struct geneve_dev *geneve = netdev_priv(dev);
1097 	__be16 sport;
1098 
1099 	if (ip_tunnel_info_af(info) == AF_INET) {
1100 		struct rtable *rt;
1101 		struct flowi4 fl4;
1102 
1103 		struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1104 		sport = udp_flow_src_port(geneve->net, skb,
1105 					  1, USHRT_MAX, true);
1106 
1107 		rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1108 				      geneve->cfg.info.key.tp_dst, sport);
1109 		if (IS_ERR(rt))
1110 			return PTR_ERR(rt);
1111 
1112 		ip_rt_put(rt);
1113 		info->key.u.ipv4.src = fl4.saddr;
1114 #if IS_ENABLED(CONFIG_IPV6)
1115 	} else if (ip_tunnel_info_af(info) == AF_INET6) {
1116 		struct dst_entry *dst;
1117 		struct flowi6 fl6;
1118 
1119 		struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1120 		sport = udp_flow_src_port(geneve->net, skb,
1121 					  1, USHRT_MAX, true);
1122 
1123 		dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1124 					geneve->cfg.info.key.tp_dst, sport);
1125 		if (IS_ERR(dst))
1126 			return PTR_ERR(dst);
1127 
1128 		dst_release(dst);
1129 		info->key.u.ipv6.src = fl6.saddr;
1130 #endif
1131 	} else {
1132 		return -EINVAL;
1133 	}
1134 
1135 	info->key.tp_src = sport;
1136 	info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1137 	return 0;
1138 }
1139 
1140 static const struct net_device_ops geneve_netdev_ops = {
1141 	.ndo_init		= geneve_init,
1142 	.ndo_uninit		= geneve_uninit,
1143 	.ndo_open		= geneve_open,
1144 	.ndo_stop		= geneve_stop,
1145 	.ndo_start_xmit		= geneve_xmit,
1146 	.ndo_get_stats64	= ip_tunnel_get_stats64,
1147 	.ndo_change_mtu		= geneve_change_mtu,
1148 	.ndo_validate_addr	= eth_validate_addr,
1149 	.ndo_set_mac_address	= eth_mac_addr,
1150 	.ndo_fill_metadata_dst	= geneve_fill_metadata_dst,
1151 };
1152 
1153 static void geneve_get_drvinfo(struct net_device *dev,
1154 			       struct ethtool_drvinfo *drvinfo)
1155 {
1156 	strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1157 	strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1158 }
1159 
1160 static const struct ethtool_ops geneve_ethtool_ops = {
1161 	.get_drvinfo	= geneve_get_drvinfo,
1162 	.get_link	= ethtool_op_get_link,
1163 };
1164 
1165 /* Info for udev, that this is a virtual tunnel endpoint */
1166 static struct device_type geneve_type = {
1167 	.name = "geneve",
1168 };
1169 
1170 /* Calls the ndo_udp_tunnel_add of the caller in order to
1171  * supply the listening GENEVE udp ports. Callers are expected
1172  * to implement the ndo_udp_tunnel_add.
1173  */
1174 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1175 {
1176 	struct net *net = dev_net(dev);
1177 	struct geneve_net *gn = net_generic(net, geneve_net_id);
1178 	struct geneve_sock *gs;
1179 
1180 	rcu_read_lock();
1181 	list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1182 		if (push) {
1183 			udp_tunnel_push_rx_port(dev, gs->sock,
1184 						UDP_TUNNEL_TYPE_GENEVE);
1185 		} else {
1186 			udp_tunnel_drop_rx_port(dev, gs->sock,
1187 						UDP_TUNNEL_TYPE_GENEVE);
1188 		}
1189 	}
1190 	rcu_read_unlock();
1191 }
1192 
1193 /* Initialize the device structure. */
1194 static void geneve_setup(struct net_device *dev)
1195 {
1196 	ether_setup(dev);
1197 
1198 	dev->netdev_ops = &geneve_netdev_ops;
1199 	dev->ethtool_ops = &geneve_ethtool_ops;
1200 	dev->needs_free_netdev = true;
1201 
1202 	SET_NETDEV_DEVTYPE(dev, &geneve_type);
1203 
1204 	dev->features    |= NETIF_F_LLTX;
1205 	dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1206 	dev->features    |= NETIF_F_RXCSUM;
1207 	dev->features    |= NETIF_F_GSO_SOFTWARE;
1208 
1209 	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1210 	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1211 
1212 	/* MTU range: 68 - (something less than 65535) */
1213 	dev->min_mtu = ETH_MIN_MTU;
1214 	/* The max_mtu calculation does not take account of GENEVE
1215 	 * options, to avoid excluding potentially valid
1216 	 * configurations. This will be further reduced by IPvX hdr size.
1217 	 */
1218 	dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1219 
1220 	netif_keep_dst(dev);
1221 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1222 	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1223 	eth_hw_addr_random(dev);
1224 }
1225 
1226 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1227 	[IFLA_GENEVE_ID]		= { .type = NLA_U32 },
1228 	[IFLA_GENEVE_REMOTE]		= { .len = sizeof_field(struct iphdr, daddr) },
1229 	[IFLA_GENEVE_REMOTE6]		= { .len = sizeof(struct in6_addr) },
1230 	[IFLA_GENEVE_TTL]		= { .type = NLA_U8 },
1231 	[IFLA_GENEVE_TOS]		= { .type = NLA_U8 },
1232 	[IFLA_GENEVE_LABEL]		= { .type = NLA_U32 },
1233 	[IFLA_GENEVE_PORT]		= { .type = NLA_U16 },
1234 	[IFLA_GENEVE_COLLECT_METADATA]	= { .type = NLA_FLAG },
1235 	[IFLA_GENEVE_UDP_CSUM]		= { .type = NLA_U8 },
1236 	[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]	= { .type = NLA_U8 },
1237 	[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]	= { .type = NLA_U8 },
1238 	[IFLA_GENEVE_TTL_INHERIT]	= { .type = NLA_U8 },
1239 	[IFLA_GENEVE_DF]		= { .type = NLA_U8 },
1240 };
1241 
1242 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1243 			   struct netlink_ext_ack *extack)
1244 {
1245 	if (tb[IFLA_ADDRESS]) {
1246 		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1247 			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1248 					    "Provided link layer address is not Ethernet");
1249 			return -EINVAL;
1250 		}
1251 
1252 		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1253 			NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1254 					    "Provided Ethernet address is not unicast");
1255 			return -EADDRNOTAVAIL;
1256 		}
1257 	}
1258 
1259 	if (!data) {
1260 		NL_SET_ERR_MSG(extack,
1261 			       "Not enough attributes provided to perform the operation");
1262 		return -EINVAL;
1263 	}
1264 
1265 	if (data[IFLA_GENEVE_ID]) {
1266 		__u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1267 
1268 		if (vni >= GENEVE_N_VID) {
1269 			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1270 					    "Geneve ID must be lower than 16777216");
1271 			return -ERANGE;
1272 		}
1273 	}
1274 
1275 	if (data[IFLA_GENEVE_DF]) {
1276 		enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1277 
1278 		if (df < 0 || df > GENEVE_DF_MAX) {
1279 			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1280 					    "Invalid DF attribute");
1281 			return -EINVAL;
1282 		}
1283 	}
1284 
1285 	return 0;
1286 }
1287 
1288 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1289 					  const struct ip_tunnel_info *info,
1290 					  bool *tun_on_same_port,
1291 					  bool *tun_collect_md)
1292 {
1293 	struct geneve_dev *geneve, *t = NULL;
1294 
1295 	*tun_on_same_port = false;
1296 	*tun_collect_md = false;
1297 	list_for_each_entry(geneve, &gn->geneve_list, next) {
1298 		if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1299 			*tun_collect_md = geneve->cfg.collect_md;
1300 			*tun_on_same_port = true;
1301 		}
1302 		if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1303 		    info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1304 		    !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1305 			t = geneve;
1306 	}
1307 	return t;
1308 }
1309 
1310 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1311 {
1312 	return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1313 		 info->key.ttl || info->key.label || info->key.tp_src ||
1314 		 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1315 }
1316 
1317 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1318 				  struct ip_tunnel_info *b)
1319 {
1320 	if (ip_tunnel_info_af(a) == AF_INET)
1321 		return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1322 	else
1323 		return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1324 }
1325 
1326 static int geneve_configure(struct net *net, struct net_device *dev,
1327 			    struct netlink_ext_ack *extack,
1328 			    const struct geneve_config *cfg)
1329 {
1330 	struct geneve_net *gn = net_generic(net, geneve_net_id);
1331 	struct geneve_dev *t, *geneve = netdev_priv(dev);
1332 	const struct ip_tunnel_info *info = &cfg->info;
1333 	bool tun_collect_md, tun_on_same_port;
1334 	int err, encap_len;
1335 
1336 	if (cfg->collect_md && !is_tnl_info_zero(info)) {
1337 		NL_SET_ERR_MSG(extack,
1338 			       "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1339 		return -EINVAL;
1340 	}
1341 
1342 	geneve->net = net;
1343 	geneve->dev = dev;
1344 
1345 	t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1346 	if (t)
1347 		return -EBUSY;
1348 
1349 	/* make enough headroom for basic scenario */
1350 	encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1351 	if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1352 		encap_len += sizeof(struct iphdr);
1353 		dev->max_mtu -= sizeof(struct iphdr);
1354 	} else {
1355 		encap_len += sizeof(struct ipv6hdr);
1356 		dev->max_mtu -= sizeof(struct ipv6hdr);
1357 	}
1358 	dev->needed_headroom = encap_len + ETH_HLEN;
1359 
1360 	if (cfg->collect_md) {
1361 		if (tun_on_same_port) {
1362 			NL_SET_ERR_MSG(extack,
1363 				       "There can be only one externally controlled device on a destination port");
1364 			return -EPERM;
1365 		}
1366 	} else {
1367 		if (tun_collect_md) {
1368 			NL_SET_ERR_MSG(extack,
1369 				       "There already exists an externally controlled device on this destination port");
1370 			return -EPERM;
1371 		}
1372 	}
1373 
1374 	dst_cache_reset(&geneve->cfg.info.dst_cache);
1375 	memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1376 
1377 	err = register_netdevice(dev);
1378 	if (err)
1379 		return err;
1380 
1381 	list_add(&geneve->next, &gn->geneve_list);
1382 	return 0;
1383 }
1384 
1385 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1386 {
1387 	memset(info, 0, sizeof(*info));
1388 	info->key.tp_dst = htons(dst_port);
1389 }
1390 
1391 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1392 			  struct netlink_ext_ack *extack,
1393 			  struct geneve_config *cfg, bool changelink)
1394 {
1395 	struct ip_tunnel_info *info = &cfg->info;
1396 	int attrtype;
1397 
1398 	if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1399 		NL_SET_ERR_MSG(extack,
1400 			       "Cannot specify both IPv4 and IPv6 Remote addresses");
1401 		return -EINVAL;
1402 	}
1403 
1404 	if (data[IFLA_GENEVE_REMOTE]) {
1405 		if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1406 			attrtype = IFLA_GENEVE_REMOTE;
1407 			goto change_notsup;
1408 		}
1409 
1410 		info->key.u.ipv4.dst =
1411 			nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1412 
1413 		if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1414 			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1415 					    "Remote IPv4 address cannot be Multicast");
1416 			return -EINVAL;
1417 		}
1418 	}
1419 
1420 	if (data[IFLA_GENEVE_REMOTE6]) {
1421 #if IS_ENABLED(CONFIG_IPV6)
1422 		if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1423 			attrtype = IFLA_GENEVE_REMOTE6;
1424 			goto change_notsup;
1425 		}
1426 
1427 		info->mode = IP_TUNNEL_INFO_IPV6;
1428 		info->key.u.ipv6.dst =
1429 			nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1430 
1431 		if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1432 		    IPV6_ADDR_LINKLOCAL) {
1433 			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1434 					    "Remote IPv6 address cannot be link-local");
1435 			return -EINVAL;
1436 		}
1437 		if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1438 			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1439 					    "Remote IPv6 address cannot be Multicast");
1440 			return -EINVAL;
1441 		}
1442 		info->key.tun_flags |= TUNNEL_CSUM;
1443 		cfg->use_udp6_rx_checksums = true;
1444 #else
1445 		NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1446 				    "IPv6 support not enabled in the kernel");
1447 		return -EPFNOSUPPORT;
1448 #endif
1449 	}
1450 
1451 	if (data[IFLA_GENEVE_ID]) {
1452 		__u32 vni;
1453 		__u8 tvni[3];
1454 		__be64 tunid;
1455 
1456 		vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1457 		tvni[0] = (vni & 0x00ff0000) >> 16;
1458 		tvni[1] = (vni & 0x0000ff00) >> 8;
1459 		tvni[2] =  vni & 0x000000ff;
1460 
1461 		tunid = vni_to_tunnel_id(tvni);
1462 		if (changelink && (tunid != info->key.tun_id)) {
1463 			attrtype = IFLA_GENEVE_ID;
1464 			goto change_notsup;
1465 		}
1466 		info->key.tun_id = tunid;
1467 	}
1468 
1469 	if (data[IFLA_GENEVE_TTL_INHERIT]) {
1470 		if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1471 			cfg->ttl_inherit = true;
1472 		else
1473 			cfg->ttl_inherit = false;
1474 	} else if (data[IFLA_GENEVE_TTL]) {
1475 		info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1476 		cfg->ttl_inherit = false;
1477 	}
1478 
1479 	if (data[IFLA_GENEVE_TOS])
1480 		info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1481 
1482 	if (data[IFLA_GENEVE_DF])
1483 		cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1484 
1485 	if (data[IFLA_GENEVE_LABEL]) {
1486 		info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1487 				  IPV6_FLOWLABEL_MASK;
1488 		if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1489 			NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1490 					    "Label attribute only applies for IPv6 Geneve devices");
1491 			return -EINVAL;
1492 		}
1493 	}
1494 
1495 	if (data[IFLA_GENEVE_PORT]) {
1496 		if (changelink) {
1497 			attrtype = IFLA_GENEVE_PORT;
1498 			goto change_notsup;
1499 		}
1500 		info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1501 	}
1502 
1503 	if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1504 		if (changelink) {
1505 			attrtype = IFLA_GENEVE_COLLECT_METADATA;
1506 			goto change_notsup;
1507 		}
1508 		cfg->collect_md = true;
1509 	}
1510 
1511 	if (data[IFLA_GENEVE_UDP_CSUM]) {
1512 		if (changelink) {
1513 			attrtype = IFLA_GENEVE_UDP_CSUM;
1514 			goto change_notsup;
1515 		}
1516 		if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1517 			info->key.tun_flags |= TUNNEL_CSUM;
1518 	}
1519 
1520 	if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1521 #if IS_ENABLED(CONFIG_IPV6)
1522 		if (changelink) {
1523 			attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1524 			goto change_notsup;
1525 		}
1526 		if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1527 			info->key.tun_flags &= ~TUNNEL_CSUM;
1528 #else
1529 		NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1530 				    "IPv6 support not enabled in the kernel");
1531 		return -EPFNOSUPPORT;
1532 #endif
1533 	}
1534 
1535 	if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1536 #if IS_ENABLED(CONFIG_IPV6)
1537 		if (changelink) {
1538 			attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1539 			goto change_notsup;
1540 		}
1541 		if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1542 			cfg->use_udp6_rx_checksums = false;
1543 #else
1544 		NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1545 				    "IPv6 support not enabled in the kernel");
1546 		return -EPFNOSUPPORT;
1547 #endif
1548 	}
1549 
1550 	return 0;
1551 change_notsup:
1552 	NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1553 			    "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1554 	return -EOPNOTSUPP;
1555 }
1556 
1557 static void geneve_link_config(struct net_device *dev,
1558 			       struct ip_tunnel_info *info, struct nlattr *tb[])
1559 {
1560 	struct geneve_dev *geneve = netdev_priv(dev);
1561 	int ldev_mtu = 0;
1562 
1563 	if (tb[IFLA_MTU]) {
1564 		geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1565 		return;
1566 	}
1567 
1568 	switch (ip_tunnel_info_af(info)) {
1569 	case AF_INET: {
1570 		struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1571 		struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1572 
1573 		if (!IS_ERR(rt) && rt->dst.dev) {
1574 			ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1575 			ip_rt_put(rt);
1576 		}
1577 		break;
1578 	}
1579 #if IS_ENABLED(CONFIG_IPV6)
1580 	case AF_INET6: {
1581 		struct rt6_info *rt;
1582 
1583 		if (!__in6_dev_get(dev))
1584 			break;
1585 
1586 		rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1587 				NULL, 0);
1588 
1589 		if (rt && rt->dst.dev)
1590 			ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1591 		ip6_rt_put(rt);
1592 		break;
1593 	}
1594 #endif
1595 	}
1596 
1597 	if (ldev_mtu <= 0)
1598 		return;
1599 
1600 	geneve_change_mtu(dev, ldev_mtu - info->options_len);
1601 }
1602 
1603 static int geneve_newlink(struct net *net, struct net_device *dev,
1604 			  struct nlattr *tb[], struct nlattr *data[],
1605 			  struct netlink_ext_ack *extack)
1606 {
1607 	struct geneve_config cfg = {
1608 		.df = GENEVE_DF_UNSET,
1609 		.use_udp6_rx_checksums = false,
1610 		.ttl_inherit = false,
1611 		.collect_md = false,
1612 	};
1613 	int err;
1614 
1615 	init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1616 	err = geneve_nl2info(tb, data, extack, &cfg, false);
1617 	if (err)
1618 		return err;
1619 
1620 	err = geneve_configure(net, dev, extack, &cfg);
1621 	if (err)
1622 		return err;
1623 
1624 	geneve_link_config(dev, &cfg.info, tb);
1625 
1626 	return 0;
1627 }
1628 
1629 /* Quiesces the geneve device data path for both TX and RX.
1630  *
1631  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1632  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1633  * to complete for the existing set of in-flight packets to be transmitted,
1634  * then we would have quiesced the transmit data path. All the future packets
1635  * will get dropped until we unquiesce the data path.
1636  *
1637  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1638  * if we set that to NULL under RCU and wait for synchronize_net() to
1639  * complete, then we would have quiesced the receive data path.
1640  */
1641 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1642 			   struct geneve_sock **gs6)
1643 {
1644 	*gs4 = rtnl_dereference(geneve->sock4);
1645 	rcu_assign_pointer(geneve->sock4, NULL);
1646 	if (*gs4)
1647 		rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1648 #if IS_ENABLED(CONFIG_IPV6)
1649 	*gs6 = rtnl_dereference(geneve->sock6);
1650 	rcu_assign_pointer(geneve->sock6, NULL);
1651 	if (*gs6)
1652 		rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1653 #else
1654 	*gs6 = NULL;
1655 #endif
1656 	synchronize_net();
1657 }
1658 
1659 /* Resumes the geneve device data path for both TX and RX. */
1660 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1661 			     struct geneve_sock __maybe_unused *gs6)
1662 {
1663 	rcu_assign_pointer(geneve->sock4, gs4);
1664 	if (gs4)
1665 		rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1666 #if IS_ENABLED(CONFIG_IPV6)
1667 	rcu_assign_pointer(geneve->sock6, gs6);
1668 	if (gs6)
1669 		rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1670 #endif
1671 	synchronize_net();
1672 }
1673 
1674 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1675 			     struct nlattr *data[],
1676 			     struct netlink_ext_ack *extack)
1677 {
1678 	struct geneve_dev *geneve = netdev_priv(dev);
1679 	struct geneve_sock *gs4, *gs6;
1680 	struct geneve_config cfg;
1681 	int err;
1682 
1683 	/* If the geneve device is configured for metadata (or externally
1684 	 * controlled, for example, OVS), then nothing can be changed.
1685 	 */
1686 	if (geneve->cfg.collect_md)
1687 		return -EOPNOTSUPP;
1688 
1689 	/* Start with the existing info. */
1690 	memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1691 	err = geneve_nl2info(tb, data, extack, &cfg, true);
1692 	if (err)
1693 		return err;
1694 
1695 	if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1696 		dst_cache_reset(&cfg.info.dst_cache);
1697 		geneve_link_config(dev, &cfg.info, tb);
1698 	}
1699 
1700 	geneve_quiesce(geneve, &gs4, &gs6);
1701 	memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1702 	geneve_unquiesce(geneve, gs4, gs6);
1703 
1704 	return 0;
1705 }
1706 
1707 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1708 {
1709 	struct geneve_dev *geneve = netdev_priv(dev);
1710 
1711 	list_del(&geneve->next);
1712 	unregister_netdevice_queue(dev, head);
1713 }
1714 
1715 static size_t geneve_get_size(const struct net_device *dev)
1716 {
1717 	return nla_total_size(sizeof(__u32)) +	/* IFLA_GENEVE_ID */
1718 		nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1719 		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1720 		nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1721 		nla_total_size(sizeof(__u8)) +	/* IFLA_GENEVE_DF */
1722 		nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1723 		nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1724 		nla_total_size(0) +	 /* IFLA_GENEVE_COLLECT_METADATA */
1725 		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1726 		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1727 		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1728 		nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1729 		0;
1730 }
1731 
1732 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1733 {
1734 	struct geneve_dev *geneve = netdev_priv(dev);
1735 	struct ip_tunnel_info *info = &geneve->cfg.info;
1736 	bool ttl_inherit = geneve->cfg.ttl_inherit;
1737 	bool metadata = geneve->cfg.collect_md;
1738 	__u8 tmp_vni[3];
1739 	__u32 vni;
1740 
1741 	tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1742 	vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1743 	if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1744 		goto nla_put_failure;
1745 
1746 	if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1747 		if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1748 				    info->key.u.ipv4.dst))
1749 			goto nla_put_failure;
1750 		if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1751 			       !!(info->key.tun_flags & TUNNEL_CSUM)))
1752 			goto nla_put_failure;
1753 
1754 #if IS_ENABLED(CONFIG_IPV6)
1755 	} else if (!metadata) {
1756 		if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1757 				     &info->key.u.ipv6.dst))
1758 			goto nla_put_failure;
1759 		if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1760 			       !(info->key.tun_flags & TUNNEL_CSUM)))
1761 			goto nla_put_failure;
1762 #endif
1763 	}
1764 
1765 	if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1766 	    nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1767 	    nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1768 		goto nla_put_failure;
1769 
1770 	if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1771 		goto nla_put_failure;
1772 
1773 	if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1774 		goto nla_put_failure;
1775 
1776 	if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1777 		goto nla_put_failure;
1778 
1779 #if IS_ENABLED(CONFIG_IPV6)
1780 	if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1781 		       !geneve->cfg.use_udp6_rx_checksums))
1782 		goto nla_put_failure;
1783 #endif
1784 
1785 	if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1786 		goto nla_put_failure;
1787 
1788 	return 0;
1789 
1790 nla_put_failure:
1791 	return -EMSGSIZE;
1792 }
1793 
1794 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1795 	.kind		= "geneve",
1796 	.maxtype	= IFLA_GENEVE_MAX,
1797 	.policy		= geneve_policy,
1798 	.priv_size	= sizeof(struct geneve_dev),
1799 	.setup		= geneve_setup,
1800 	.validate	= geneve_validate,
1801 	.newlink	= geneve_newlink,
1802 	.changelink	= geneve_changelink,
1803 	.dellink	= geneve_dellink,
1804 	.get_size	= geneve_get_size,
1805 	.fill_info	= geneve_fill_info,
1806 };
1807 
1808 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1809 					u8 name_assign_type, u16 dst_port)
1810 {
1811 	struct nlattr *tb[IFLA_MAX + 1];
1812 	struct net_device *dev;
1813 	LIST_HEAD(list_kill);
1814 	int err;
1815 	struct geneve_config cfg = {
1816 		.df = GENEVE_DF_UNSET,
1817 		.use_udp6_rx_checksums = true,
1818 		.ttl_inherit = false,
1819 		.collect_md = true,
1820 	};
1821 
1822 	memset(tb, 0, sizeof(tb));
1823 	dev = rtnl_create_link(net, name, name_assign_type,
1824 			       &geneve_link_ops, tb, NULL);
1825 	if (IS_ERR(dev))
1826 		return dev;
1827 
1828 	init_tnl_info(&cfg.info, dst_port);
1829 	err = geneve_configure(net, dev, NULL, &cfg);
1830 	if (err) {
1831 		free_netdev(dev);
1832 		return ERR_PTR(err);
1833 	}
1834 
1835 	/* openvswitch users expect packet sizes to be unrestricted,
1836 	 * so set the largest MTU we can.
1837 	 */
1838 	err = geneve_change_mtu(dev, IP_MAX_MTU);
1839 	if (err)
1840 		goto err;
1841 
1842 	err = rtnl_configure_link(dev, NULL);
1843 	if (err < 0)
1844 		goto err;
1845 
1846 	return dev;
1847 err:
1848 	geneve_dellink(dev, &list_kill);
1849 	unregister_netdevice_many(&list_kill);
1850 	return ERR_PTR(err);
1851 }
1852 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1853 
1854 static int geneve_netdevice_event(struct notifier_block *unused,
1855 				  unsigned long event, void *ptr)
1856 {
1857 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1858 
1859 	if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1860 	    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1861 		geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1862 	} else if (event == NETDEV_UNREGISTER) {
1863 		if (!dev->udp_tunnel_nic_info)
1864 			geneve_offload_rx_ports(dev, false);
1865 	} else if (event == NETDEV_REGISTER) {
1866 		if (!dev->udp_tunnel_nic_info)
1867 			geneve_offload_rx_ports(dev, true);
1868 	}
1869 
1870 	return NOTIFY_DONE;
1871 }
1872 
1873 static struct notifier_block geneve_notifier_block __read_mostly = {
1874 	.notifier_call = geneve_netdevice_event,
1875 };
1876 
1877 static __net_init int geneve_init_net(struct net *net)
1878 {
1879 	struct geneve_net *gn = net_generic(net, geneve_net_id);
1880 
1881 	INIT_LIST_HEAD(&gn->geneve_list);
1882 	INIT_LIST_HEAD(&gn->sock_list);
1883 	return 0;
1884 }
1885 
1886 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1887 {
1888 	struct geneve_net *gn = net_generic(net, geneve_net_id);
1889 	struct geneve_dev *geneve, *next;
1890 	struct net_device *dev, *aux;
1891 
1892 	/* gather any geneve devices that were moved into this ns */
1893 	for_each_netdev_safe(net, dev, aux)
1894 		if (dev->rtnl_link_ops == &geneve_link_ops)
1895 			unregister_netdevice_queue(dev, head);
1896 
1897 	/* now gather any other geneve devices that were created in this ns */
1898 	list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1899 		/* If geneve->dev is in the same netns, it was already added
1900 		 * to the list by the previous loop.
1901 		 */
1902 		if (!net_eq(dev_net(geneve->dev), net))
1903 			unregister_netdevice_queue(geneve->dev, head);
1904 	}
1905 }
1906 
1907 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1908 {
1909 	struct net *net;
1910 	LIST_HEAD(list);
1911 
1912 	rtnl_lock();
1913 	list_for_each_entry(net, net_list, exit_list)
1914 		geneve_destroy_tunnels(net, &list);
1915 
1916 	/* unregister the devices gathered above */
1917 	unregister_netdevice_many(&list);
1918 	rtnl_unlock();
1919 
1920 	list_for_each_entry(net, net_list, exit_list) {
1921 		const struct geneve_net *gn = net_generic(net, geneve_net_id);
1922 
1923 		WARN_ON_ONCE(!list_empty(&gn->sock_list));
1924 	}
1925 }
1926 
1927 static struct pernet_operations geneve_net_ops = {
1928 	.init = geneve_init_net,
1929 	.exit_batch = geneve_exit_batch_net,
1930 	.id   = &geneve_net_id,
1931 	.size = sizeof(struct geneve_net),
1932 };
1933 
1934 static int __init geneve_init_module(void)
1935 {
1936 	int rc;
1937 
1938 	rc = register_pernet_subsys(&geneve_net_ops);
1939 	if (rc)
1940 		goto out1;
1941 
1942 	rc = register_netdevice_notifier(&geneve_notifier_block);
1943 	if (rc)
1944 		goto out2;
1945 
1946 	rc = rtnl_link_register(&geneve_link_ops);
1947 	if (rc)
1948 		goto out3;
1949 
1950 	return 0;
1951 out3:
1952 	unregister_netdevice_notifier(&geneve_notifier_block);
1953 out2:
1954 	unregister_pernet_subsys(&geneve_net_ops);
1955 out1:
1956 	return rc;
1957 }
1958 late_initcall(geneve_init_module);
1959 
1960 static void __exit geneve_cleanup_module(void)
1961 {
1962 	rtnl_link_unregister(&geneve_link_ops);
1963 	unregister_netdevice_notifier(&geneve_notifier_block);
1964 	unregister_pernet_subsys(&geneve_net_ops);
1965 }
1966 module_exit(geneve_cleanup_module);
1967 
1968 MODULE_LICENSE("GPL");
1969 MODULE_VERSION(GENEVE_NETDEV_VER);
1970 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1971 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1972 MODULE_ALIAS_RTNL_LINK("geneve");
1973