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Merge branch 'am335x-phy-fixes' into omap-for-v5.0/fixes-v2
[mirror_ubuntu-eoan-kernel.git] / drivers / net / geneve.c
1 /*
2 * GENEVE: Generic Network Virtualization Encapsulation
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/etherdevice.h>
16 #include <linux/hash.h>
17 #include <net/dst_metadata.h>
18 #include <net/gro_cells.h>
19 #include <net/rtnetlink.h>
20 #include <net/geneve.h>
21 #include <net/protocol.h>
22
23 #define GENEVE_NETDEV_VER "0.6"
24
25 #define GENEVE_UDP_PORT 6081
26
27 #define GENEVE_N_VID (1u << 24)
28 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
29
30 #define VNI_HASH_BITS 10
31 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
32
33 static bool log_ecn_error = true;
34 module_param(log_ecn_error, bool, 0644);
35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
36
37 #define GENEVE_VER 0
38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
39 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
40 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
41
42 /* per-network namespace private data for this module */
43 struct geneve_net {
44 struct list_head geneve_list;
45 struct list_head sock_list;
46 };
47
48 static unsigned int geneve_net_id;
49
50 struct geneve_dev_node {
51 struct hlist_node hlist;
52 struct geneve_dev *geneve;
53 };
54
55 /* Pseudo network device */
56 struct geneve_dev {
57 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
58 #if IS_ENABLED(CONFIG_IPV6)
59 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
60 #endif
61 struct net *net; /* netns for packet i/o */
62 struct net_device *dev; /* netdev for geneve tunnel */
63 struct ip_tunnel_info info;
64 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
65 #if IS_ENABLED(CONFIG_IPV6)
66 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
67 #endif
68 struct list_head next; /* geneve's per namespace list */
69 struct gro_cells gro_cells;
70 bool collect_md;
71 bool use_udp6_rx_checksums;
72 bool ttl_inherit;
73 enum ifla_geneve_df df;
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->info.key.tun_id, vni) &&
140 addr == node->geneve->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->info.key.tun_id, vni) &&
159 ipv6_addr_equal(&addr6, &node->geneve->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->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->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 (skb->len < 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->info.key.tp_dst);
662 if (gs) {
663 gs->refcnt++;
664 goto out;
665 }
666
667 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
668 geneve->use_udp6_rx_checksums);
669 if (IS_ERR(gs))
670 return PTR_ERR(gs);
671
672 out:
673 gs->collect_md = geneve->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->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 ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
696 bool metadata = geneve->collect_md;
697 int ret = 0;
698
699 #if IS_ENABLED(CONFIG_IPV6)
700 if (ipv6 || metadata)
701 ret = geneve_sock_add(geneve, true);
702 #endif
703 if (!ret && (!ipv6 || metadata))
704 ret = geneve_sock_add(geneve, false);
705 if (ret < 0)
706 geneve_sock_release(geneve);
707
708 return ret;
709 }
710
711 static int geneve_stop(struct net_device *dev)
712 {
713 struct geneve_dev *geneve = netdev_priv(dev);
714
715 hlist_del_init_rcu(&geneve->hlist4.hlist);
716 #if IS_ENABLED(CONFIG_IPV6)
717 hlist_del_init_rcu(&geneve->hlist6.hlist);
718 #endif
719 geneve_sock_release(geneve);
720 return 0;
721 }
722
723 static void geneve_build_header(struct genevehdr *geneveh,
724 const struct ip_tunnel_info *info)
725 {
726 geneveh->ver = GENEVE_VER;
727 geneveh->opt_len = info->options_len / 4;
728 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
729 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
730 geneveh->rsvd1 = 0;
731 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
732 geneveh->proto_type = htons(ETH_P_TEB);
733 geneveh->rsvd2 = 0;
734
735 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
736 ip_tunnel_info_opts_get(geneveh->options, info);
737 }
738
739 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
740 const struct ip_tunnel_info *info,
741 bool xnet, int ip_hdr_len)
742 {
743 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
744 struct genevehdr *gnvh;
745 int min_headroom;
746 int err;
747
748 skb_reset_mac_header(skb);
749 skb_scrub_packet(skb, xnet);
750
751 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
752 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
753 err = skb_cow_head(skb, min_headroom);
754 if (unlikely(err))
755 goto free_dst;
756
757 err = udp_tunnel_handle_offloads(skb, udp_sum);
758 if (err)
759 goto free_dst;
760
761 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
762 geneve_build_header(gnvh, info);
763 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
764 return 0;
765
766 free_dst:
767 dst_release(dst);
768 return err;
769 }
770
771 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
772 struct net_device *dev,
773 struct geneve_sock *gs4,
774 struct flowi4 *fl4,
775 const struct ip_tunnel_info *info)
776 {
777 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
778 struct geneve_dev *geneve = netdev_priv(dev);
779 struct dst_cache *dst_cache;
780 struct rtable *rt = NULL;
781 __u8 tos;
782
783 if (!gs4)
784 return ERR_PTR(-EIO);
785
786 memset(fl4, 0, sizeof(*fl4));
787 fl4->flowi4_mark = skb->mark;
788 fl4->flowi4_proto = IPPROTO_UDP;
789 fl4->daddr = info->key.u.ipv4.dst;
790 fl4->saddr = info->key.u.ipv4.src;
791
792 tos = info->key.tos;
793 if ((tos == 1) && !geneve->collect_md) {
794 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
795 use_cache = false;
796 }
797 fl4->flowi4_tos = RT_TOS(tos);
798
799 dst_cache = (struct dst_cache *)&info->dst_cache;
800 if (use_cache) {
801 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
802 if (rt)
803 return rt;
804 }
805 rt = ip_route_output_key(geneve->net, fl4);
806 if (IS_ERR(rt)) {
807 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
808 return ERR_PTR(-ENETUNREACH);
809 }
810 if (rt->dst.dev == dev) { /* is this necessary? */
811 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
812 ip_rt_put(rt);
813 return ERR_PTR(-ELOOP);
814 }
815 if (use_cache)
816 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
817 return rt;
818 }
819
820 #if IS_ENABLED(CONFIG_IPV6)
821 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
822 struct net_device *dev,
823 struct geneve_sock *gs6,
824 struct flowi6 *fl6,
825 const struct ip_tunnel_info *info)
826 {
827 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
828 struct geneve_dev *geneve = netdev_priv(dev);
829 struct dst_entry *dst = NULL;
830 struct dst_cache *dst_cache;
831 __u8 prio;
832
833 if (!gs6)
834 return ERR_PTR(-EIO);
835
836 memset(fl6, 0, sizeof(*fl6));
837 fl6->flowi6_mark = skb->mark;
838 fl6->flowi6_proto = IPPROTO_UDP;
839 fl6->daddr = info->key.u.ipv6.dst;
840 fl6->saddr = info->key.u.ipv6.src;
841 prio = info->key.tos;
842 if ((prio == 1) && !geneve->collect_md) {
843 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
844 use_cache = false;
845 }
846
847 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
848 info->key.label);
849 dst_cache = (struct dst_cache *)&info->dst_cache;
850 if (use_cache) {
851 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
852 if (dst)
853 return dst;
854 }
855 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
856 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
857 return ERR_PTR(-ENETUNREACH);
858 }
859 if (dst->dev == dev) { /* is this necessary? */
860 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
861 dst_release(dst);
862 return ERR_PTR(-ELOOP);
863 }
864
865 if (use_cache)
866 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
867 return dst;
868 }
869 #endif
870
871 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
872 struct geneve_dev *geneve,
873 const struct ip_tunnel_info *info)
874 {
875 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
876 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
877 const struct ip_tunnel_key *key = &info->key;
878 struct rtable *rt;
879 struct flowi4 fl4;
880 __u8 tos, ttl;
881 __be16 df = 0;
882 __be16 sport;
883 int err;
884
885 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
886 if (IS_ERR(rt))
887 return PTR_ERR(rt);
888
889 skb_tunnel_check_pmtu(skb, &rt->dst,
890 GENEVE_IPV4_HLEN + info->options_len);
891
892 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
893 if (geneve->collect_md) {
894 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
895 ttl = key->ttl;
896
897 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
898 } else {
899 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
900 if (geneve->ttl_inherit)
901 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
902 else
903 ttl = key->ttl;
904 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
905
906 if (geneve->df == GENEVE_DF_SET) {
907 df = htons(IP_DF);
908 } else if (geneve->df == GENEVE_DF_INHERIT) {
909 struct ethhdr *eth = eth_hdr(skb);
910
911 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
912 df = htons(IP_DF);
913 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
914 struct iphdr *iph = ip_hdr(skb);
915
916 if (iph->frag_off & htons(IP_DF))
917 df = htons(IP_DF);
918 }
919 }
920 }
921
922 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
923 if (unlikely(err))
924 return err;
925
926 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
927 tos, ttl, df, sport, geneve->info.key.tp_dst,
928 !net_eq(geneve->net, dev_net(geneve->dev)),
929 !(info->key.tun_flags & TUNNEL_CSUM));
930 return 0;
931 }
932
933 #if IS_ENABLED(CONFIG_IPV6)
934 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
935 struct geneve_dev *geneve,
936 const struct ip_tunnel_info *info)
937 {
938 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
939 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
940 const struct ip_tunnel_key *key = &info->key;
941 struct dst_entry *dst = NULL;
942 struct flowi6 fl6;
943 __u8 prio, ttl;
944 __be16 sport;
945 int err;
946
947 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
948 if (IS_ERR(dst))
949 return PTR_ERR(dst);
950
951 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
952
953 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
954 if (geneve->collect_md) {
955 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
956 ttl = key->ttl;
957 } else {
958 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
959 ip_hdr(skb), skb);
960 if (geneve->ttl_inherit)
961 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
962 else
963 ttl = key->ttl;
964 ttl = ttl ? : ip6_dst_hoplimit(dst);
965 }
966 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
967 if (unlikely(err))
968 return err;
969
970 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
971 &fl6.saddr, &fl6.daddr, prio, ttl,
972 info->key.label, sport, geneve->info.key.tp_dst,
973 !(info->key.tun_flags & TUNNEL_CSUM));
974 return 0;
975 }
976 #endif
977
978 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
979 {
980 struct geneve_dev *geneve = netdev_priv(dev);
981 struct ip_tunnel_info *info = NULL;
982 int err;
983
984 if (geneve->collect_md) {
985 info = skb_tunnel_info(skb);
986 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
987 err = -EINVAL;
988 netdev_dbg(dev, "no tunnel metadata\n");
989 goto tx_error;
990 }
991 } else {
992 info = &geneve->info;
993 }
994
995 rcu_read_lock();
996 #if IS_ENABLED(CONFIG_IPV6)
997 if (info->mode & IP_TUNNEL_INFO_IPV6)
998 err = geneve6_xmit_skb(skb, dev, geneve, info);
999 else
1000 #endif
1001 err = geneve_xmit_skb(skb, dev, geneve, info);
1002 rcu_read_unlock();
1003
1004 if (likely(!err))
1005 return NETDEV_TX_OK;
1006 tx_error:
1007 dev_kfree_skb(skb);
1008
1009 if (err == -ELOOP)
1010 dev->stats.collisions++;
1011 else if (err == -ENETUNREACH)
1012 dev->stats.tx_carrier_errors++;
1013
1014 dev->stats.tx_errors++;
1015 return NETDEV_TX_OK;
1016 }
1017
1018 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1019 {
1020 if (new_mtu > dev->max_mtu)
1021 new_mtu = dev->max_mtu;
1022 else if (new_mtu < dev->min_mtu)
1023 new_mtu = dev->min_mtu;
1024
1025 dev->mtu = new_mtu;
1026 return 0;
1027 }
1028
1029 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1030 {
1031 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1032 struct geneve_dev *geneve = netdev_priv(dev);
1033
1034 if (ip_tunnel_info_af(info) == AF_INET) {
1035 struct rtable *rt;
1036 struct flowi4 fl4;
1037 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1038
1039 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
1040 if (IS_ERR(rt))
1041 return PTR_ERR(rt);
1042
1043 ip_rt_put(rt);
1044 info->key.u.ipv4.src = fl4.saddr;
1045 #if IS_ENABLED(CONFIG_IPV6)
1046 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1047 struct dst_entry *dst;
1048 struct flowi6 fl6;
1049 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1050
1051 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
1052 if (IS_ERR(dst))
1053 return PTR_ERR(dst);
1054
1055 dst_release(dst);
1056 info->key.u.ipv6.src = fl6.saddr;
1057 #endif
1058 } else {
1059 return -EINVAL;
1060 }
1061
1062 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1063 1, USHRT_MAX, true);
1064 info->key.tp_dst = geneve->info.key.tp_dst;
1065 return 0;
1066 }
1067
1068 static const struct net_device_ops geneve_netdev_ops = {
1069 .ndo_init = geneve_init,
1070 .ndo_uninit = geneve_uninit,
1071 .ndo_open = geneve_open,
1072 .ndo_stop = geneve_stop,
1073 .ndo_start_xmit = geneve_xmit,
1074 .ndo_get_stats64 = ip_tunnel_get_stats64,
1075 .ndo_change_mtu = geneve_change_mtu,
1076 .ndo_validate_addr = eth_validate_addr,
1077 .ndo_set_mac_address = eth_mac_addr,
1078 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1079 };
1080
1081 static void geneve_get_drvinfo(struct net_device *dev,
1082 struct ethtool_drvinfo *drvinfo)
1083 {
1084 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1085 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1086 }
1087
1088 static const struct ethtool_ops geneve_ethtool_ops = {
1089 .get_drvinfo = geneve_get_drvinfo,
1090 .get_link = ethtool_op_get_link,
1091 };
1092
1093 /* Info for udev, that this is a virtual tunnel endpoint */
1094 static struct device_type geneve_type = {
1095 .name = "geneve",
1096 };
1097
1098 /* Calls the ndo_udp_tunnel_add of the caller in order to
1099 * supply the listening GENEVE udp ports. Callers are expected
1100 * to implement the ndo_udp_tunnel_add.
1101 */
1102 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1103 {
1104 struct net *net = dev_net(dev);
1105 struct geneve_net *gn = net_generic(net, geneve_net_id);
1106 struct geneve_sock *gs;
1107
1108 rcu_read_lock();
1109 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1110 if (push) {
1111 udp_tunnel_push_rx_port(dev, gs->sock,
1112 UDP_TUNNEL_TYPE_GENEVE);
1113 } else {
1114 udp_tunnel_drop_rx_port(dev, gs->sock,
1115 UDP_TUNNEL_TYPE_GENEVE);
1116 }
1117 }
1118 rcu_read_unlock();
1119 }
1120
1121 /* Initialize the device structure. */
1122 static void geneve_setup(struct net_device *dev)
1123 {
1124 ether_setup(dev);
1125
1126 dev->netdev_ops = &geneve_netdev_ops;
1127 dev->ethtool_ops = &geneve_ethtool_ops;
1128 dev->needs_free_netdev = true;
1129
1130 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1131
1132 dev->features |= NETIF_F_LLTX;
1133 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1134 dev->features |= NETIF_F_RXCSUM;
1135 dev->features |= NETIF_F_GSO_SOFTWARE;
1136
1137 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1138 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1139
1140 /* MTU range: 68 - (something less than 65535) */
1141 dev->min_mtu = ETH_MIN_MTU;
1142 /* The max_mtu calculation does not take account of GENEVE
1143 * options, to avoid excluding potentially valid
1144 * configurations. This will be further reduced by IPvX hdr size.
1145 */
1146 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1147
1148 netif_keep_dst(dev);
1149 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1150 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1151 eth_hw_addr_random(dev);
1152 }
1153
1154 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1155 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1156 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1157 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1158 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1159 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1160 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1161 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1162 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1163 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1164 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1165 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1166 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1167 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1168 };
1169
1170 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1171 struct netlink_ext_ack *extack)
1172 {
1173 if (tb[IFLA_ADDRESS]) {
1174 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1175 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1176 "Provided link layer address is not Ethernet");
1177 return -EINVAL;
1178 }
1179
1180 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1181 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1182 "Provided Ethernet address is not unicast");
1183 return -EADDRNOTAVAIL;
1184 }
1185 }
1186
1187 if (!data) {
1188 NL_SET_ERR_MSG(extack,
1189 "Not enough attributes provided to perform the operation");
1190 return -EINVAL;
1191 }
1192
1193 if (data[IFLA_GENEVE_ID]) {
1194 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1195
1196 if (vni >= GENEVE_N_VID) {
1197 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1198 "Geneve ID must be lower than 16777216");
1199 return -ERANGE;
1200 }
1201 }
1202
1203 if (data[IFLA_GENEVE_DF]) {
1204 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1205
1206 if (df < 0 || df > GENEVE_DF_MAX) {
1207 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF],
1208 "Invalid DF attribute");
1209 return -EINVAL;
1210 }
1211 }
1212
1213 return 0;
1214 }
1215
1216 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1217 const struct ip_tunnel_info *info,
1218 bool *tun_on_same_port,
1219 bool *tun_collect_md)
1220 {
1221 struct geneve_dev *geneve, *t = NULL;
1222
1223 *tun_on_same_port = false;
1224 *tun_collect_md = false;
1225 list_for_each_entry(geneve, &gn->geneve_list, next) {
1226 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1227 *tun_collect_md = geneve->collect_md;
1228 *tun_on_same_port = true;
1229 }
1230 if (info->key.tun_id == geneve->info.key.tun_id &&
1231 info->key.tp_dst == geneve->info.key.tp_dst &&
1232 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1233 t = geneve;
1234 }
1235 return t;
1236 }
1237
1238 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1239 {
1240 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1241 info->key.ttl || info->key.label || info->key.tp_src ||
1242 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1243 }
1244
1245 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1246 struct ip_tunnel_info *b)
1247 {
1248 if (ip_tunnel_info_af(a) == AF_INET)
1249 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1250 else
1251 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1252 }
1253
1254 static int geneve_configure(struct net *net, struct net_device *dev,
1255 struct netlink_ext_ack *extack,
1256 const struct ip_tunnel_info *info,
1257 bool metadata, bool ipv6_rx_csum,
1258 bool ttl_inherit, enum ifla_geneve_df df)
1259 {
1260 struct geneve_net *gn = net_generic(net, geneve_net_id);
1261 struct geneve_dev *t, *geneve = netdev_priv(dev);
1262 bool tun_collect_md, tun_on_same_port;
1263 int err, encap_len;
1264
1265 if (metadata && !is_tnl_info_zero(info)) {
1266 NL_SET_ERR_MSG(extack,
1267 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1268 return -EINVAL;
1269 }
1270
1271 geneve->net = net;
1272 geneve->dev = dev;
1273
1274 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1275 if (t)
1276 return -EBUSY;
1277
1278 /* make enough headroom for basic scenario */
1279 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1280 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1281 encap_len += sizeof(struct iphdr);
1282 dev->max_mtu -= sizeof(struct iphdr);
1283 } else {
1284 encap_len += sizeof(struct ipv6hdr);
1285 dev->max_mtu -= sizeof(struct ipv6hdr);
1286 }
1287 dev->needed_headroom = encap_len + ETH_HLEN;
1288
1289 if (metadata) {
1290 if (tun_on_same_port) {
1291 NL_SET_ERR_MSG(extack,
1292 "There can be only one externally controlled device on a destination port");
1293 return -EPERM;
1294 }
1295 } else {
1296 if (tun_collect_md) {
1297 NL_SET_ERR_MSG(extack,
1298 "There already exists an externally controlled device on this destination port");
1299 return -EPERM;
1300 }
1301 }
1302
1303 dst_cache_reset(&geneve->info.dst_cache);
1304 geneve->info = *info;
1305 geneve->collect_md = metadata;
1306 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1307 geneve->ttl_inherit = ttl_inherit;
1308 geneve->df = df;
1309
1310 err = register_netdevice(dev);
1311 if (err)
1312 return err;
1313
1314 list_add(&geneve->next, &gn->geneve_list);
1315 return 0;
1316 }
1317
1318 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1319 {
1320 memset(info, 0, sizeof(*info));
1321 info->key.tp_dst = htons(dst_port);
1322 }
1323
1324 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1325 struct netlink_ext_ack *extack,
1326 struct ip_tunnel_info *info, bool *metadata,
1327 bool *use_udp6_rx_checksums, bool *ttl_inherit,
1328 enum ifla_geneve_df *df, bool changelink)
1329 {
1330 int attrtype;
1331
1332 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1333 NL_SET_ERR_MSG(extack,
1334 "Cannot specify both IPv4 and IPv6 Remote addresses");
1335 return -EINVAL;
1336 }
1337
1338 if (data[IFLA_GENEVE_REMOTE]) {
1339 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1340 attrtype = IFLA_GENEVE_REMOTE;
1341 goto change_notsup;
1342 }
1343
1344 info->key.u.ipv4.dst =
1345 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1346
1347 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1348 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1349 "Remote IPv4 address cannot be Multicast");
1350 return -EINVAL;
1351 }
1352 }
1353
1354 if (data[IFLA_GENEVE_REMOTE6]) {
1355 #if IS_ENABLED(CONFIG_IPV6)
1356 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1357 attrtype = IFLA_GENEVE_REMOTE6;
1358 goto change_notsup;
1359 }
1360
1361 info->mode = IP_TUNNEL_INFO_IPV6;
1362 info->key.u.ipv6.dst =
1363 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1364
1365 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1366 IPV6_ADDR_LINKLOCAL) {
1367 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1368 "Remote IPv6 address cannot be link-local");
1369 return -EINVAL;
1370 }
1371 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1372 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1373 "Remote IPv6 address cannot be Multicast");
1374 return -EINVAL;
1375 }
1376 info->key.tun_flags |= TUNNEL_CSUM;
1377 *use_udp6_rx_checksums = true;
1378 #else
1379 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1380 "IPv6 support not enabled in the kernel");
1381 return -EPFNOSUPPORT;
1382 #endif
1383 }
1384
1385 if (data[IFLA_GENEVE_ID]) {
1386 __u32 vni;
1387 __u8 tvni[3];
1388 __be64 tunid;
1389
1390 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1391 tvni[0] = (vni & 0x00ff0000) >> 16;
1392 tvni[1] = (vni & 0x0000ff00) >> 8;
1393 tvni[2] = vni & 0x000000ff;
1394
1395 tunid = vni_to_tunnel_id(tvni);
1396 if (changelink && (tunid != info->key.tun_id)) {
1397 attrtype = IFLA_GENEVE_ID;
1398 goto change_notsup;
1399 }
1400 info->key.tun_id = tunid;
1401 }
1402
1403 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1404 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1405 *ttl_inherit = true;
1406 else
1407 *ttl_inherit = false;
1408 } else if (data[IFLA_GENEVE_TTL]) {
1409 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1410 *ttl_inherit = false;
1411 }
1412
1413 if (data[IFLA_GENEVE_TOS])
1414 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1415
1416 if (data[IFLA_GENEVE_DF])
1417 *df = nla_get_u8(data[IFLA_GENEVE_DF]);
1418
1419 if (data[IFLA_GENEVE_LABEL]) {
1420 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1421 IPV6_FLOWLABEL_MASK;
1422 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1423 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1424 "Label attribute only applies for IPv6 Geneve devices");
1425 return -EINVAL;
1426 }
1427 }
1428
1429 if (data[IFLA_GENEVE_PORT]) {
1430 if (changelink) {
1431 attrtype = IFLA_GENEVE_PORT;
1432 goto change_notsup;
1433 }
1434 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1435 }
1436
1437 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1438 if (changelink) {
1439 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1440 goto change_notsup;
1441 }
1442 *metadata = true;
1443 }
1444
1445 if (data[IFLA_GENEVE_UDP_CSUM]) {
1446 if (changelink) {
1447 attrtype = IFLA_GENEVE_UDP_CSUM;
1448 goto change_notsup;
1449 }
1450 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1451 info->key.tun_flags |= TUNNEL_CSUM;
1452 }
1453
1454 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1455 #if IS_ENABLED(CONFIG_IPV6)
1456 if (changelink) {
1457 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1458 goto change_notsup;
1459 }
1460 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1461 info->key.tun_flags &= ~TUNNEL_CSUM;
1462 #else
1463 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1464 "IPv6 support not enabled in the kernel");
1465 return -EPFNOSUPPORT;
1466 #endif
1467 }
1468
1469 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1470 #if IS_ENABLED(CONFIG_IPV6)
1471 if (changelink) {
1472 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1473 goto change_notsup;
1474 }
1475 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1476 *use_udp6_rx_checksums = false;
1477 #else
1478 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1479 "IPv6 support not enabled in the kernel");
1480 return -EPFNOSUPPORT;
1481 #endif
1482 }
1483
1484 return 0;
1485 change_notsup:
1486 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1487 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1488 return -EOPNOTSUPP;
1489 }
1490
1491 static void geneve_link_config(struct net_device *dev,
1492 struct ip_tunnel_info *info, struct nlattr *tb[])
1493 {
1494 struct geneve_dev *geneve = netdev_priv(dev);
1495 int ldev_mtu = 0;
1496
1497 if (tb[IFLA_MTU]) {
1498 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1499 return;
1500 }
1501
1502 switch (ip_tunnel_info_af(info)) {
1503 case AF_INET: {
1504 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1505 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1506
1507 if (!IS_ERR(rt) && rt->dst.dev) {
1508 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1509 ip_rt_put(rt);
1510 }
1511 break;
1512 }
1513 #if IS_ENABLED(CONFIG_IPV6)
1514 case AF_INET6: {
1515 struct rt6_info *rt = rt6_lookup(geneve->net,
1516 &info->key.u.ipv6.dst, NULL, 0,
1517 NULL, 0);
1518
1519 if (rt && rt->dst.dev)
1520 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1521 ip6_rt_put(rt);
1522 break;
1523 }
1524 #endif
1525 }
1526
1527 if (ldev_mtu <= 0)
1528 return;
1529
1530 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1531 }
1532
1533 static int geneve_newlink(struct net *net, struct net_device *dev,
1534 struct nlattr *tb[], struct nlattr *data[],
1535 struct netlink_ext_ack *extack)
1536 {
1537 enum ifla_geneve_df df = GENEVE_DF_UNSET;
1538 bool use_udp6_rx_checksums = false;
1539 struct ip_tunnel_info info;
1540 bool ttl_inherit = false;
1541 bool metadata = false;
1542 int err;
1543
1544 init_tnl_info(&info, GENEVE_UDP_PORT);
1545 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1546 &use_udp6_rx_checksums, &ttl_inherit, &df, false);
1547 if (err)
1548 return err;
1549
1550 err = geneve_configure(net, dev, extack, &info, metadata,
1551 use_udp6_rx_checksums, ttl_inherit, df);
1552 if (err)
1553 return err;
1554
1555 geneve_link_config(dev, &info, tb);
1556
1557 return 0;
1558 }
1559
1560 /* Quiesces the geneve device data path for both TX and RX.
1561 *
1562 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1563 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1564 * to complete for the existing set of in-flight packets to be transmitted,
1565 * then we would have quiesced the transmit data path. All the future packets
1566 * will get dropped until we unquiesce the data path.
1567 *
1568 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1569 * if we set that to NULL under RCU and wait for synchronize_net() to
1570 * complete, then we would have quiesced the receive data path.
1571 */
1572 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1573 struct geneve_sock **gs6)
1574 {
1575 *gs4 = rtnl_dereference(geneve->sock4);
1576 rcu_assign_pointer(geneve->sock4, NULL);
1577 if (*gs4)
1578 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1579 #if IS_ENABLED(CONFIG_IPV6)
1580 *gs6 = rtnl_dereference(geneve->sock6);
1581 rcu_assign_pointer(geneve->sock6, NULL);
1582 if (*gs6)
1583 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1584 #else
1585 *gs6 = NULL;
1586 #endif
1587 synchronize_net();
1588 }
1589
1590 /* Resumes the geneve device data path for both TX and RX. */
1591 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1592 struct geneve_sock __maybe_unused *gs6)
1593 {
1594 rcu_assign_pointer(geneve->sock4, gs4);
1595 if (gs4)
1596 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1597 #if IS_ENABLED(CONFIG_IPV6)
1598 rcu_assign_pointer(geneve->sock6, gs6);
1599 if (gs6)
1600 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1601 #endif
1602 synchronize_net();
1603 }
1604
1605 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1606 struct nlattr *data[],
1607 struct netlink_ext_ack *extack)
1608 {
1609 struct geneve_dev *geneve = netdev_priv(dev);
1610 struct geneve_sock *gs4, *gs6;
1611 struct ip_tunnel_info info;
1612 bool metadata;
1613 bool use_udp6_rx_checksums;
1614 enum ifla_geneve_df df;
1615 bool ttl_inherit;
1616 int err;
1617
1618 /* If the geneve device is configured for metadata (or externally
1619 * controlled, for example, OVS), then nothing can be changed.
1620 */
1621 if (geneve->collect_md)
1622 return -EOPNOTSUPP;
1623
1624 /* Start with the existing info. */
1625 memcpy(&info, &geneve->info, sizeof(info));
1626 metadata = geneve->collect_md;
1627 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1628 ttl_inherit = geneve->ttl_inherit;
1629 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1630 &use_udp6_rx_checksums, &ttl_inherit, &df, true);
1631 if (err)
1632 return err;
1633
1634 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1635 dst_cache_reset(&info.dst_cache);
1636 geneve_link_config(dev, &info, tb);
1637 }
1638
1639 geneve_quiesce(geneve, &gs4, &gs6);
1640 geneve->info = info;
1641 geneve->collect_md = metadata;
1642 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1643 geneve->ttl_inherit = ttl_inherit;
1644 geneve_unquiesce(geneve, gs4, gs6);
1645
1646 return 0;
1647 }
1648
1649 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1650 {
1651 struct geneve_dev *geneve = netdev_priv(dev);
1652
1653 list_del(&geneve->next);
1654 unregister_netdevice_queue(dev, head);
1655 }
1656
1657 static size_t geneve_get_size(const struct net_device *dev)
1658 {
1659 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1660 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1661 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1662 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1663 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1664 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1665 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1666 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1667 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1668 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1669 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1670 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1671 0;
1672 }
1673
1674 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1675 {
1676 struct geneve_dev *geneve = netdev_priv(dev);
1677 struct ip_tunnel_info *info = &geneve->info;
1678 bool ttl_inherit = geneve->ttl_inherit;
1679 bool metadata = geneve->collect_md;
1680 __u8 tmp_vni[3];
1681 __u32 vni;
1682
1683 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1684 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1685 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1686 goto nla_put_failure;
1687
1688 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1689 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1690 info->key.u.ipv4.dst))
1691 goto nla_put_failure;
1692 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1693 !!(info->key.tun_flags & TUNNEL_CSUM)))
1694 goto nla_put_failure;
1695
1696 #if IS_ENABLED(CONFIG_IPV6)
1697 } else if (!metadata) {
1698 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1699 &info->key.u.ipv6.dst))
1700 goto nla_put_failure;
1701 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1702 !(info->key.tun_flags & TUNNEL_CSUM)))
1703 goto nla_put_failure;
1704 #endif
1705 }
1706
1707 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1708 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1709 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1710 goto nla_put_failure;
1711
1712 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->df))
1713 goto nla_put_failure;
1714
1715 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1716 goto nla_put_failure;
1717
1718 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1719 goto nla_put_failure;
1720
1721 #if IS_ENABLED(CONFIG_IPV6)
1722 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1723 !geneve->use_udp6_rx_checksums))
1724 goto nla_put_failure;
1725 #endif
1726
1727 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1728 goto nla_put_failure;
1729
1730 return 0;
1731
1732 nla_put_failure:
1733 return -EMSGSIZE;
1734 }
1735
1736 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1737 .kind = "geneve",
1738 .maxtype = IFLA_GENEVE_MAX,
1739 .policy = geneve_policy,
1740 .priv_size = sizeof(struct geneve_dev),
1741 .setup = geneve_setup,
1742 .validate = geneve_validate,
1743 .newlink = geneve_newlink,
1744 .changelink = geneve_changelink,
1745 .dellink = geneve_dellink,
1746 .get_size = geneve_get_size,
1747 .fill_info = geneve_fill_info,
1748 };
1749
1750 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1751 u8 name_assign_type, u16 dst_port)
1752 {
1753 struct nlattr *tb[IFLA_MAX + 1];
1754 struct ip_tunnel_info info;
1755 struct net_device *dev;
1756 LIST_HEAD(list_kill);
1757 int err;
1758
1759 memset(tb, 0, sizeof(tb));
1760 dev = rtnl_create_link(net, name, name_assign_type,
1761 &geneve_link_ops, tb, NULL);
1762 if (IS_ERR(dev))
1763 return dev;
1764
1765 init_tnl_info(&info, dst_port);
1766 err = geneve_configure(net, dev, NULL, &info,
1767 true, true, false, GENEVE_DF_UNSET);
1768 if (err) {
1769 free_netdev(dev);
1770 return ERR_PTR(err);
1771 }
1772
1773 /* openvswitch users expect packet sizes to be unrestricted,
1774 * so set the largest MTU we can.
1775 */
1776 err = geneve_change_mtu(dev, IP_MAX_MTU);
1777 if (err)
1778 goto err;
1779
1780 err = rtnl_configure_link(dev, NULL);
1781 if (err < 0)
1782 goto err;
1783
1784 return dev;
1785 err:
1786 geneve_dellink(dev, &list_kill);
1787 unregister_netdevice_many(&list_kill);
1788 return ERR_PTR(err);
1789 }
1790 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1791
1792 static int geneve_netdevice_event(struct notifier_block *unused,
1793 unsigned long event, void *ptr)
1794 {
1795 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1796
1797 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1798 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1799 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1800 } else if (event == NETDEV_UNREGISTER) {
1801 geneve_offload_rx_ports(dev, false);
1802 } else if (event == NETDEV_REGISTER) {
1803 geneve_offload_rx_ports(dev, true);
1804 }
1805
1806 return NOTIFY_DONE;
1807 }
1808
1809 static struct notifier_block geneve_notifier_block __read_mostly = {
1810 .notifier_call = geneve_netdevice_event,
1811 };
1812
1813 static __net_init int geneve_init_net(struct net *net)
1814 {
1815 struct geneve_net *gn = net_generic(net, geneve_net_id);
1816
1817 INIT_LIST_HEAD(&gn->geneve_list);
1818 INIT_LIST_HEAD(&gn->sock_list);
1819 return 0;
1820 }
1821
1822 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1823 {
1824 struct geneve_net *gn = net_generic(net, geneve_net_id);
1825 struct geneve_dev *geneve, *next;
1826 struct net_device *dev, *aux;
1827
1828 /* gather any geneve devices that were moved into this ns */
1829 for_each_netdev_safe(net, dev, aux)
1830 if (dev->rtnl_link_ops == &geneve_link_ops)
1831 unregister_netdevice_queue(dev, head);
1832
1833 /* now gather any other geneve devices that were created in this ns */
1834 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1835 /* If geneve->dev is in the same netns, it was already added
1836 * to the list by the previous loop.
1837 */
1838 if (!net_eq(dev_net(geneve->dev), net))
1839 unregister_netdevice_queue(geneve->dev, head);
1840 }
1841
1842 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1843 }
1844
1845 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1846 {
1847 struct net *net;
1848 LIST_HEAD(list);
1849
1850 rtnl_lock();
1851 list_for_each_entry(net, net_list, exit_list)
1852 geneve_destroy_tunnels(net, &list);
1853
1854 /* unregister the devices gathered above */
1855 unregister_netdevice_many(&list);
1856 rtnl_unlock();
1857 }
1858
1859 static struct pernet_operations geneve_net_ops = {
1860 .init = geneve_init_net,
1861 .exit_batch = geneve_exit_batch_net,
1862 .id = &geneve_net_id,
1863 .size = sizeof(struct geneve_net),
1864 };
1865
1866 static int __init geneve_init_module(void)
1867 {
1868 int rc;
1869
1870 rc = register_pernet_subsys(&geneve_net_ops);
1871 if (rc)
1872 goto out1;
1873
1874 rc = register_netdevice_notifier(&geneve_notifier_block);
1875 if (rc)
1876 goto out2;
1877
1878 rc = rtnl_link_register(&geneve_link_ops);
1879 if (rc)
1880 goto out3;
1881
1882 return 0;
1883 out3:
1884 unregister_netdevice_notifier(&geneve_notifier_block);
1885 out2:
1886 unregister_pernet_subsys(&geneve_net_ops);
1887 out1:
1888 return rc;
1889 }
1890 late_initcall(geneve_init_module);
1891
1892 static void __exit geneve_cleanup_module(void)
1893 {
1894 rtnl_link_unregister(&geneve_link_ops);
1895 unregister_netdevice_notifier(&geneve_notifier_block);
1896 unregister_pernet_subsys(&geneve_net_ops);
1897 }
1898 module_exit(geneve_cleanup_module);
1899
1900 MODULE_LICENSE("GPL");
1901 MODULE_VERSION(GENEVE_NETDEV_VER);
1902 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1903 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1904 MODULE_ALIAS_RTNL_LINK("geneve");
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