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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 metadata = geneve->collect_md;
696 bool ipv4, ipv6;
697 int ret = 0;
698
699 ipv6 = geneve->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 {
782 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
783 struct geneve_dev *geneve = netdev_priv(dev);
784 struct dst_cache *dst_cache;
785 struct rtable *rt = NULL;
786 __u8 tos;
787
788 if (!gs4)
789 return ERR_PTR(-EIO);
790
791 memset(fl4, 0, sizeof(*fl4));
792 fl4->flowi4_mark = skb->mark;
793 fl4->flowi4_proto = IPPROTO_UDP;
794 fl4->daddr = info->key.u.ipv4.dst;
795 fl4->saddr = info->key.u.ipv4.src;
796
797 tos = info->key.tos;
798 if ((tos == 1) && !geneve->collect_md) {
799 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
800 use_cache = false;
801 }
802 fl4->flowi4_tos = RT_TOS(tos);
803
804 dst_cache = (struct dst_cache *)&info->dst_cache;
805 if (use_cache) {
806 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
807 if (rt)
808 return rt;
809 }
810 rt = ip_route_output_key(geneve->net, fl4);
811 if (IS_ERR(rt)) {
812 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
813 return ERR_PTR(-ENETUNREACH);
814 }
815 if (rt->dst.dev == dev) { /* is this necessary? */
816 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
817 ip_rt_put(rt);
818 return ERR_PTR(-ELOOP);
819 }
820 if (use_cache)
821 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
822 return rt;
823 }
824
825 #if IS_ENABLED(CONFIG_IPV6)
826 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
827 struct net_device *dev,
828 struct geneve_sock *gs6,
829 struct flowi6 *fl6,
830 const struct ip_tunnel_info *info)
831 {
832 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
833 struct geneve_dev *geneve = netdev_priv(dev);
834 struct dst_entry *dst = NULL;
835 struct dst_cache *dst_cache;
836 __u8 prio;
837
838 if (!gs6)
839 return ERR_PTR(-EIO);
840
841 memset(fl6, 0, sizeof(*fl6));
842 fl6->flowi6_mark = skb->mark;
843 fl6->flowi6_proto = IPPROTO_UDP;
844 fl6->daddr = info->key.u.ipv6.dst;
845 fl6->saddr = info->key.u.ipv6.src;
846 prio = info->key.tos;
847 if ((prio == 1) && !geneve->collect_md) {
848 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
849 use_cache = false;
850 }
851
852 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
853 info->key.label);
854 dst_cache = (struct dst_cache *)&info->dst_cache;
855 if (use_cache) {
856 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
857 if (dst)
858 return dst;
859 }
860 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
861 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
862 return ERR_PTR(-ENETUNREACH);
863 }
864 if (dst->dev == dev) { /* is this necessary? */
865 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
866 dst_release(dst);
867 return ERR_PTR(-ELOOP);
868 }
869
870 if (use_cache)
871 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
872 return dst;
873 }
874 #endif
875
876 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
877 struct geneve_dev *geneve,
878 const struct ip_tunnel_info *info)
879 {
880 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
881 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
882 const struct ip_tunnel_key *key = &info->key;
883 struct rtable *rt;
884 struct flowi4 fl4;
885 __u8 tos, ttl;
886 __be16 df = 0;
887 __be16 sport;
888 int err;
889
890 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
891 if (IS_ERR(rt))
892 return PTR_ERR(rt);
893
894 skb_tunnel_check_pmtu(skb, &rt->dst,
895 GENEVE_IPV4_HLEN + info->options_len);
896
897 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
898 if (geneve->collect_md) {
899 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
900 ttl = key->ttl;
901
902 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
903 } else {
904 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
905 if (geneve->ttl_inherit)
906 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
907 else
908 ttl = key->ttl;
909 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
910
911 if (geneve->df == GENEVE_DF_SET) {
912 df = htons(IP_DF);
913 } else if (geneve->df == GENEVE_DF_INHERIT) {
914 struct ethhdr *eth = eth_hdr(skb);
915
916 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
917 df = htons(IP_DF);
918 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
919 struct iphdr *iph = ip_hdr(skb);
920
921 if (iph->frag_off & htons(IP_DF))
922 df = htons(IP_DF);
923 }
924 }
925 }
926
927 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
928 if (unlikely(err))
929 return err;
930
931 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
932 tos, ttl, df, sport, geneve->info.key.tp_dst,
933 !net_eq(geneve->net, dev_net(geneve->dev)),
934 !(info->key.tun_flags & TUNNEL_CSUM));
935 return 0;
936 }
937
938 #if IS_ENABLED(CONFIG_IPV6)
939 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
940 struct geneve_dev *geneve,
941 const struct ip_tunnel_info *info)
942 {
943 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
944 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
945 const struct ip_tunnel_key *key = &info->key;
946 struct dst_entry *dst = NULL;
947 struct flowi6 fl6;
948 __u8 prio, ttl;
949 __be16 sport;
950 int err;
951
952 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
953 if (IS_ERR(dst))
954 return PTR_ERR(dst);
955
956 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
957
958 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
959 if (geneve->collect_md) {
960 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
961 ttl = key->ttl;
962 } else {
963 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
964 ip_hdr(skb), skb);
965 if (geneve->ttl_inherit)
966 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
967 else
968 ttl = key->ttl;
969 ttl = ttl ? : ip6_dst_hoplimit(dst);
970 }
971 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
972 if (unlikely(err))
973 return err;
974
975 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
976 &fl6.saddr, &fl6.daddr, prio, ttl,
977 info->key.label, sport, geneve->info.key.tp_dst,
978 !(info->key.tun_flags & TUNNEL_CSUM));
979 return 0;
980 }
981 #endif
982
983 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
984 {
985 struct geneve_dev *geneve = netdev_priv(dev);
986 struct ip_tunnel_info *info = NULL;
987 int err;
988
989 if (geneve->collect_md) {
990 info = skb_tunnel_info(skb);
991 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
992 err = -EINVAL;
993 netdev_dbg(dev, "no tunnel metadata\n");
994 goto tx_error;
995 }
996 } else {
997 info = &geneve->info;
998 }
999
1000 rcu_read_lock();
1001 #if IS_ENABLED(CONFIG_IPV6)
1002 if (info->mode & IP_TUNNEL_INFO_IPV6)
1003 err = geneve6_xmit_skb(skb, dev, geneve, info);
1004 else
1005 #endif
1006 err = geneve_xmit_skb(skb, dev, geneve, info);
1007 rcu_read_unlock();
1008
1009 if (likely(!err))
1010 return NETDEV_TX_OK;
1011 tx_error:
1012 dev_kfree_skb(skb);
1013
1014 if (err == -ELOOP)
1015 dev->stats.collisions++;
1016 else if (err == -ENETUNREACH)
1017 dev->stats.tx_carrier_errors++;
1018
1019 dev->stats.tx_errors++;
1020 return NETDEV_TX_OK;
1021 }
1022
1023 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1024 {
1025 if (new_mtu > dev->max_mtu)
1026 new_mtu = dev->max_mtu;
1027 else if (new_mtu < dev->min_mtu)
1028 new_mtu = dev->min_mtu;
1029
1030 dev->mtu = new_mtu;
1031 return 0;
1032 }
1033
1034 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1035 {
1036 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1037 struct geneve_dev *geneve = netdev_priv(dev);
1038
1039 if (ip_tunnel_info_af(info) == AF_INET) {
1040 struct rtable *rt;
1041 struct flowi4 fl4;
1042 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1043
1044 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
1045 if (IS_ERR(rt))
1046 return PTR_ERR(rt);
1047
1048 ip_rt_put(rt);
1049 info->key.u.ipv4.src = fl4.saddr;
1050 #if IS_ENABLED(CONFIG_IPV6)
1051 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1052 struct dst_entry *dst;
1053 struct flowi6 fl6;
1054 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1055
1056 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
1057 if (IS_ERR(dst))
1058 return PTR_ERR(dst);
1059
1060 dst_release(dst);
1061 info->key.u.ipv6.src = fl6.saddr;
1062 #endif
1063 } else {
1064 return -EINVAL;
1065 }
1066
1067 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1068 1, USHRT_MAX, true);
1069 info->key.tp_dst = geneve->info.key.tp_dst;
1070 return 0;
1071 }
1072
1073 static const struct net_device_ops geneve_netdev_ops = {
1074 .ndo_init = geneve_init,
1075 .ndo_uninit = geneve_uninit,
1076 .ndo_open = geneve_open,
1077 .ndo_stop = geneve_stop,
1078 .ndo_start_xmit = geneve_xmit,
1079 .ndo_get_stats64 = ip_tunnel_get_stats64,
1080 .ndo_change_mtu = geneve_change_mtu,
1081 .ndo_validate_addr = eth_validate_addr,
1082 .ndo_set_mac_address = eth_mac_addr,
1083 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1084 };
1085
1086 static void geneve_get_drvinfo(struct net_device *dev,
1087 struct ethtool_drvinfo *drvinfo)
1088 {
1089 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1090 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1091 }
1092
1093 static const struct ethtool_ops geneve_ethtool_ops = {
1094 .get_drvinfo = geneve_get_drvinfo,
1095 .get_link = ethtool_op_get_link,
1096 };
1097
1098 /* Info for udev, that this is a virtual tunnel endpoint */
1099 static struct device_type geneve_type = {
1100 .name = "geneve",
1101 };
1102
1103 /* Calls the ndo_udp_tunnel_add of the caller in order to
1104 * supply the listening GENEVE udp ports. Callers are expected
1105 * to implement the ndo_udp_tunnel_add.
1106 */
1107 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1108 {
1109 struct net *net = dev_net(dev);
1110 struct geneve_net *gn = net_generic(net, geneve_net_id);
1111 struct geneve_sock *gs;
1112
1113 rcu_read_lock();
1114 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1115 if (push) {
1116 udp_tunnel_push_rx_port(dev, gs->sock,
1117 UDP_TUNNEL_TYPE_GENEVE);
1118 } else {
1119 udp_tunnel_drop_rx_port(dev, gs->sock,
1120 UDP_TUNNEL_TYPE_GENEVE);
1121 }
1122 }
1123 rcu_read_unlock();
1124 }
1125
1126 /* Initialize the device structure. */
1127 static void geneve_setup(struct net_device *dev)
1128 {
1129 ether_setup(dev);
1130
1131 dev->netdev_ops = &geneve_netdev_ops;
1132 dev->ethtool_ops = &geneve_ethtool_ops;
1133 dev->needs_free_netdev = true;
1134
1135 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1136
1137 dev->features |= NETIF_F_LLTX;
1138 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1139 dev->features |= NETIF_F_RXCSUM;
1140 dev->features |= NETIF_F_GSO_SOFTWARE;
1141
1142 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1143 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1144
1145 /* MTU range: 68 - (something less than 65535) */
1146 dev->min_mtu = ETH_MIN_MTU;
1147 /* The max_mtu calculation does not take account of GENEVE
1148 * options, to avoid excluding potentially valid
1149 * configurations. This will be further reduced by IPvX hdr size.
1150 */
1151 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1152
1153 netif_keep_dst(dev);
1154 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1155 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1156 eth_hw_addr_random(dev);
1157 }
1158
1159 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1160 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1161 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1162 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1163 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1164 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1165 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1166 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1167 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1168 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1169 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1170 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1171 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1172 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1173 };
1174
1175 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1176 struct netlink_ext_ack *extack)
1177 {
1178 if (tb[IFLA_ADDRESS]) {
1179 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1180 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1181 "Provided link layer address is not Ethernet");
1182 return -EINVAL;
1183 }
1184
1185 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1186 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1187 "Provided Ethernet address is not unicast");
1188 return -EADDRNOTAVAIL;
1189 }
1190 }
1191
1192 if (!data) {
1193 NL_SET_ERR_MSG(extack,
1194 "Not enough attributes provided to perform the operation");
1195 return -EINVAL;
1196 }
1197
1198 if (data[IFLA_GENEVE_ID]) {
1199 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1200
1201 if (vni >= GENEVE_N_VID) {
1202 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1203 "Geneve ID must be lower than 16777216");
1204 return -ERANGE;
1205 }
1206 }
1207
1208 if (data[IFLA_GENEVE_DF]) {
1209 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1210
1211 if (df < 0 || df > GENEVE_DF_MAX) {
1212 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF],
1213 "Invalid DF attribute");
1214 return -EINVAL;
1215 }
1216 }
1217
1218 return 0;
1219 }
1220
1221 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1222 const struct ip_tunnel_info *info,
1223 bool *tun_on_same_port,
1224 bool *tun_collect_md)
1225 {
1226 struct geneve_dev *geneve, *t = NULL;
1227
1228 *tun_on_same_port = false;
1229 *tun_collect_md = false;
1230 list_for_each_entry(geneve, &gn->geneve_list, next) {
1231 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1232 *tun_collect_md = geneve->collect_md;
1233 *tun_on_same_port = true;
1234 }
1235 if (info->key.tun_id == geneve->info.key.tun_id &&
1236 info->key.tp_dst == geneve->info.key.tp_dst &&
1237 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1238 t = geneve;
1239 }
1240 return t;
1241 }
1242
1243 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1244 {
1245 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1246 info->key.ttl || info->key.label || info->key.tp_src ||
1247 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1248 }
1249
1250 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1251 struct ip_tunnel_info *b)
1252 {
1253 if (ip_tunnel_info_af(a) == AF_INET)
1254 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1255 else
1256 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1257 }
1258
1259 static int geneve_configure(struct net *net, struct net_device *dev,
1260 struct netlink_ext_ack *extack,
1261 const struct ip_tunnel_info *info,
1262 bool metadata, bool ipv6_rx_csum,
1263 bool ttl_inherit, enum ifla_geneve_df df)
1264 {
1265 struct geneve_net *gn = net_generic(net, geneve_net_id);
1266 struct geneve_dev *t, *geneve = netdev_priv(dev);
1267 bool tun_collect_md, tun_on_same_port;
1268 int err, encap_len;
1269
1270 if (metadata && !is_tnl_info_zero(info)) {
1271 NL_SET_ERR_MSG(extack,
1272 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1273 return -EINVAL;
1274 }
1275
1276 geneve->net = net;
1277 geneve->dev = dev;
1278
1279 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1280 if (t)
1281 return -EBUSY;
1282
1283 /* make enough headroom for basic scenario */
1284 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1285 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1286 encap_len += sizeof(struct iphdr);
1287 dev->max_mtu -= sizeof(struct iphdr);
1288 } else {
1289 encap_len += sizeof(struct ipv6hdr);
1290 dev->max_mtu -= sizeof(struct ipv6hdr);
1291 }
1292 dev->needed_headroom = encap_len + ETH_HLEN;
1293
1294 if (metadata) {
1295 if (tun_on_same_port) {
1296 NL_SET_ERR_MSG(extack,
1297 "There can be only one externally controlled device on a destination port");
1298 return -EPERM;
1299 }
1300 } else {
1301 if (tun_collect_md) {
1302 NL_SET_ERR_MSG(extack,
1303 "There already exists an externally controlled device on this destination port");
1304 return -EPERM;
1305 }
1306 }
1307
1308 dst_cache_reset(&geneve->info.dst_cache);
1309 geneve->info = *info;
1310 geneve->collect_md = metadata;
1311 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1312 geneve->ttl_inherit = ttl_inherit;
1313 geneve->df = df;
1314
1315 err = register_netdevice(dev);
1316 if (err)
1317 return err;
1318
1319 list_add(&geneve->next, &gn->geneve_list);
1320 return 0;
1321 }
1322
1323 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1324 {
1325 memset(info, 0, sizeof(*info));
1326 info->key.tp_dst = htons(dst_port);
1327 }
1328
1329 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1330 struct netlink_ext_ack *extack,
1331 struct ip_tunnel_info *info, bool *metadata,
1332 bool *use_udp6_rx_checksums, bool *ttl_inherit,
1333 enum ifla_geneve_df *df, bool changelink)
1334 {
1335 int attrtype;
1336
1337 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1338 NL_SET_ERR_MSG(extack,
1339 "Cannot specify both IPv4 and IPv6 Remote addresses");
1340 return -EINVAL;
1341 }
1342
1343 if (data[IFLA_GENEVE_REMOTE]) {
1344 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1345 attrtype = IFLA_GENEVE_REMOTE;
1346 goto change_notsup;
1347 }
1348
1349 info->key.u.ipv4.dst =
1350 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1351
1352 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1353 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1354 "Remote IPv4 address cannot be Multicast");
1355 return -EINVAL;
1356 }
1357 }
1358
1359 if (data[IFLA_GENEVE_REMOTE6]) {
1360 #if IS_ENABLED(CONFIG_IPV6)
1361 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1362 attrtype = IFLA_GENEVE_REMOTE6;
1363 goto change_notsup;
1364 }
1365
1366 info->mode = IP_TUNNEL_INFO_IPV6;
1367 info->key.u.ipv6.dst =
1368 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1369
1370 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1371 IPV6_ADDR_LINKLOCAL) {
1372 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1373 "Remote IPv6 address cannot be link-local");
1374 return -EINVAL;
1375 }
1376 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1377 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1378 "Remote IPv6 address cannot be Multicast");
1379 return -EINVAL;
1380 }
1381 info->key.tun_flags |= TUNNEL_CSUM;
1382 *use_udp6_rx_checksums = true;
1383 #else
1384 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1385 "IPv6 support not enabled in the kernel");
1386 return -EPFNOSUPPORT;
1387 #endif
1388 }
1389
1390 if (data[IFLA_GENEVE_ID]) {
1391 __u32 vni;
1392 __u8 tvni[3];
1393 __be64 tunid;
1394
1395 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1396 tvni[0] = (vni & 0x00ff0000) >> 16;
1397 tvni[1] = (vni & 0x0000ff00) >> 8;
1398 tvni[2] = vni & 0x000000ff;
1399
1400 tunid = vni_to_tunnel_id(tvni);
1401 if (changelink && (tunid != info->key.tun_id)) {
1402 attrtype = IFLA_GENEVE_ID;
1403 goto change_notsup;
1404 }
1405 info->key.tun_id = tunid;
1406 }
1407
1408 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1409 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1410 *ttl_inherit = true;
1411 else
1412 *ttl_inherit = false;
1413 } else if (data[IFLA_GENEVE_TTL]) {
1414 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1415 *ttl_inherit = false;
1416 }
1417
1418 if (data[IFLA_GENEVE_TOS])
1419 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1420
1421 if (data[IFLA_GENEVE_DF])
1422 *df = nla_get_u8(data[IFLA_GENEVE_DF]);
1423
1424 if (data[IFLA_GENEVE_LABEL]) {
1425 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1426 IPV6_FLOWLABEL_MASK;
1427 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1428 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1429 "Label attribute only applies for IPv6 Geneve devices");
1430 return -EINVAL;
1431 }
1432 }
1433
1434 if (data[IFLA_GENEVE_PORT]) {
1435 if (changelink) {
1436 attrtype = IFLA_GENEVE_PORT;
1437 goto change_notsup;
1438 }
1439 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1440 }
1441
1442 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1443 if (changelink) {
1444 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1445 goto change_notsup;
1446 }
1447 *metadata = true;
1448 }
1449
1450 if (data[IFLA_GENEVE_UDP_CSUM]) {
1451 if (changelink) {
1452 attrtype = IFLA_GENEVE_UDP_CSUM;
1453 goto change_notsup;
1454 }
1455 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1456 info->key.tun_flags |= TUNNEL_CSUM;
1457 }
1458
1459 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1460 #if IS_ENABLED(CONFIG_IPV6)
1461 if (changelink) {
1462 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1463 goto change_notsup;
1464 }
1465 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1466 info->key.tun_flags &= ~TUNNEL_CSUM;
1467 #else
1468 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1469 "IPv6 support not enabled in the kernel");
1470 return -EPFNOSUPPORT;
1471 #endif
1472 }
1473
1474 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1475 #if IS_ENABLED(CONFIG_IPV6)
1476 if (changelink) {
1477 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1478 goto change_notsup;
1479 }
1480 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1481 *use_udp6_rx_checksums = false;
1482 #else
1483 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1484 "IPv6 support not enabled in the kernel");
1485 return -EPFNOSUPPORT;
1486 #endif
1487 }
1488
1489 return 0;
1490 change_notsup:
1491 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1492 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1493 return -EOPNOTSUPP;
1494 }
1495
1496 static void geneve_link_config(struct net_device *dev,
1497 struct ip_tunnel_info *info, struct nlattr *tb[])
1498 {
1499 struct geneve_dev *geneve = netdev_priv(dev);
1500 int ldev_mtu = 0;
1501
1502 if (tb[IFLA_MTU]) {
1503 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1504 return;
1505 }
1506
1507 switch (ip_tunnel_info_af(info)) {
1508 case AF_INET: {
1509 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1510 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1511
1512 if (!IS_ERR(rt) && rt->dst.dev) {
1513 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1514 ip_rt_put(rt);
1515 }
1516 break;
1517 }
1518 #if IS_ENABLED(CONFIG_IPV6)
1519 case AF_INET6: {
1520 struct rt6_info *rt;
1521
1522 if (!__in6_dev_get(dev))
1523 break;
1524
1525 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1526 NULL, 0);
1527
1528 if (rt && rt->dst.dev)
1529 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1530 ip6_rt_put(rt);
1531 break;
1532 }
1533 #endif
1534 }
1535
1536 if (ldev_mtu <= 0)
1537 return;
1538
1539 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1540 }
1541
1542 static int geneve_newlink(struct net *net, struct net_device *dev,
1543 struct nlattr *tb[], struct nlattr *data[],
1544 struct netlink_ext_ack *extack)
1545 {
1546 enum ifla_geneve_df df = GENEVE_DF_UNSET;
1547 bool use_udp6_rx_checksums = false;
1548 struct ip_tunnel_info info;
1549 bool ttl_inherit = false;
1550 bool metadata = false;
1551 int err;
1552
1553 init_tnl_info(&info, GENEVE_UDP_PORT);
1554 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1555 &use_udp6_rx_checksums, &ttl_inherit, &df, false);
1556 if (err)
1557 return err;
1558
1559 err = geneve_configure(net, dev, extack, &info, metadata,
1560 use_udp6_rx_checksums, ttl_inherit, df);
1561 if (err)
1562 return err;
1563
1564 geneve_link_config(dev, &info, tb);
1565
1566 return 0;
1567 }
1568
1569 /* Quiesces the geneve device data path for both TX and RX.
1570 *
1571 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1572 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1573 * to complete for the existing set of in-flight packets to be transmitted,
1574 * then we would have quiesced the transmit data path. All the future packets
1575 * will get dropped until we unquiesce the data path.
1576 *
1577 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1578 * if we set that to NULL under RCU and wait for synchronize_net() to
1579 * complete, then we would have quiesced the receive data path.
1580 */
1581 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1582 struct geneve_sock **gs6)
1583 {
1584 *gs4 = rtnl_dereference(geneve->sock4);
1585 rcu_assign_pointer(geneve->sock4, NULL);
1586 if (*gs4)
1587 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1588 #if IS_ENABLED(CONFIG_IPV6)
1589 *gs6 = rtnl_dereference(geneve->sock6);
1590 rcu_assign_pointer(geneve->sock6, NULL);
1591 if (*gs6)
1592 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1593 #else
1594 *gs6 = NULL;
1595 #endif
1596 synchronize_net();
1597 }
1598
1599 /* Resumes the geneve device data path for both TX and RX. */
1600 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1601 struct geneve_sock __maybe_unused *gs6)
1602 {
1603 rcu_assign_pointer(geneve->sock4, gs4);
1604 if (gs4)
1605 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1606 #if IS_ENABLED(CONFIG_IPV6)
1607 rcu_assign_pointer(geneve->sock6, gs6);
1608 if (gs6)
1609 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1610 #endif
1611 synchronize_net();
1612 }
1613
1614 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1615 struct nlattr *data[],
1616 struct netlink_ext_ack *extack)
1617 {
1618 struct geneve_dev *geneve = netdev_priv(dev);
1619 struct geneve_sock *gs4, *gs6;
1620 struct ip_tunnel_info info;
1621 bool metadata;
1622 bool use_udp6_rx_checksums;
1623 enum ifla_geneve_df df;
1624 bool ttl_inherit;
1625 int err;
1626
1627 /* If the geneve device is configured for metadata (or externally
1628 * controlled, for example, OVS), then nothing can be changed.
1629 */
1630 if (geneve->collect_md)
1631 return -EOPNOTSUPP;
1632
1633 /* Start with the existing info. */
1634 memcpy(&info, &geneve->info, sizeof(info));
1635 metadata = geneve->collect_md;
1636 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1637 ttl_inherit = geneve->ttl_inherit;
1638 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1639 &use_udp6_rx_checksums, &ttl_inherit, &df, true);
1640 if (err)
1641 return err;
1642
1643 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1644 dst_cache_reset(&info.dst_cache);
1645 geneve_link_config(dev, &info, tb);
1646 }
1647
1648 geneve_quiesce(geneve, &gs4, &gs6);
1649 geneve->info = info;
1650 geneve->collect_md = metadata;
1651 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1652 geneve->ttl_inherit = ttl_inherit;
1653 geneve_unquiesce(geneve, gs4, gs6);
1654
1655 return 0;
1656 }
1657
1658 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1659 {
1660 struct geneve_dev *geneve = netdev_priv(dev);
1661
1662 list_del(&geneve->next);
1663 unregister_netdevice_queue(dev, head);
1664 }
1665
1666 static size_t geneve_get_size(const struct net_device *dev)
1667 {
1668 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1669 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1670 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1671 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1672 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1673 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1674 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1675 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1676 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1677 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1678 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1679 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1680 0;
1681 }
1682
1683 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1684 {
1685 struct geneve_dev *geneve = netdev_priv(dev);
1686 struct ip_tunnel_info *info = &geneve->info;
1687 bool ttl_inherit = geneve->ttl_inherit;
1688 bool metadata = geneve->collect_md;
1689 __u8 tmp_vni[3];
1690 __u32 vni;
1691
1692 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1693 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1694 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1695 goto nla_put_failure;
1696
1697 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1698 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1699 info->key.u.ipv4.dst))
1700 goto nla_put_failure;
1701 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1702 !!(info->key.tun_flags & TUNNEL_CSUM)))
1703 goto nla_put_failure;
1704
1705 #if IS_ENABLED(CONFIG_IPV6)
1706 } else if (!metadata) {
1707 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1708 &info->key.u.ipv6.dst))
1709 goto nla_put_failure;
1710 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1711 !(info->key.tun_flags & TUNNEL_CSUM)))
1712 goto nla_put_failure;
1713 #endif
1714 }
1715
1716 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1717 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1718 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1719 goto nla_put_failure;
1720
1721 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->df))
1722 goto nla_put_failure;
1723
1724 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1725 goto nla_put_failure;
1726
1727 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1728 goto nla_put_failure;
1729
1730 #if IS_ENABLED(CONFIG_IPV6)
1731 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1732 !geneve->use_udp6_rx_checksums))
1733 goto nla_put_failure;
1734 #endif
1735
1736 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1737 goto nla_put_failure;
1738
1739 return 0;
1740
1741 nla_put_failure:
1742 return -EMSGSIZE;
1743 }
1744
1745 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1746 .kind = "geneve",
1747 .maxtype = IFLA_GENEVE_MAX,
1748 .policy = geneve_policy,
1749 .priv_size = sizeof(struct geneve_dev),
1750 .setup = geneve_setup,
1751 .validate = geneve_validate,
1752 .newlink = geneve_newlink,
1753 .changelink = geneve_changelink,
1754 .dellink = geneve_dellink,
1755 .get_size = geneve_get_size,
1756 .fill_info = geneve_fill_info,
1757 };
1758
1759 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1760 u8 name_assign_type, u16 dst_port)
1761 {
1762 struct nlattr *tb[IFLA_MAX + 1];
1763 struct ip_tunnel_info info;
1764 struct net_device *dev;
1765 LIST_HEAD(list_kill);
1766 int err;
1767
1768 memset(tb, 0, sizeof(tb));
1769 dev = rtnl_create_link(net, name, name_assign_type,
1770 &geneve_link_ops, tb, NULL);
1771 if (IS_ERR(dev))
1772 return dev;
1773
1774 init_tnl_info(&info, dst_port);
1775 err = geneve_configure(net, dev, NULL, &info,
1776 true, true, false, GENEVE_DF_UNSET);
1777 if (err) {
1778 free_netdev(dev);
1779 return ERR_PTR(err);
1780 }
1781
1782 /* openvswitch users expect packet sizes to be unrestricted,
1783 * so set the largest MTU we can.
1784 */
1785 err = geneve_change_mtu(dev, IP_MAX_MTU);
1786 if (err)
1787 goto err;
1788
1789 err = rtnl_configure_link(dev, NULL);
1790 if (err < 0)
1791 goto err;
1792
1793 return dev;
1794 err:
1795 geneve_dellink(dev, &list_kill);
1796 unregister_netdevice_many(&list_kill);
1797 return ERR_PTR(err);
1798 }
1799 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1800
1801 static int geneve_netdevice_event(struct notifier_block *unused,
1802 unsigned long event, void *ptr)
1803 {
1804 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1805
1806 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1807 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1808 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1809 } else if (event == NETDEV_UNREGISTER) {
1810 geneve_offload_rx_ports(dev, false);
1811 } else if (event == NETDEV_REGISTER) {
1812 geneve_offload_rx_ports(dev, true);
1813 }
1814
1815 return NOTIFY_DONE;
1816 }
1817
1818 static struct notifier_block geneve_notifier_block __read_mostly = {
1819 .notifier_call = geneve_netdevice_event,
1820 };
1821
1822 static __net_init int geneve_init_net(struct net *net)
1823 {
1824 struct geneve_net *gn = net_generic(net, geneve_net_id);
1825
1826 INIT_LIST_HEAD(&gn->geneve_list);
1827 INIT_LIST_HEAD(&gn->sock_list);
1828 return 0;
1829 }
1830
1831 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1832 {
1833 struct geneve_net *gn = net_generic(net, geneve_net_id);
1834 struct geneve_dev *geneve, *next;
1835 struct net_device *dev, *aux;
1836
1837 /* gather any geneve devices that were moved into this ns */
1838 for_each_netdev_safe(net, dev, aux)
1839 if (dev->rtnl_link_ops == &geneve_link_ops)
1840 unregister_netdevice_queue(dev, head);
1841
1842 /* now gather any other geneve devices that were created in this ns */
1843 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1844 /* If geneve->dev is in the same netns, it was already added
1845 * to the list by the previous loop.
1846 */
1847 if (!net_eq(dev_net(geneve->dev), net))
1848 unregister_netdevice_queue(geneve->dev, head);
1849 }
1850
1851 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1852 }
1853
1854 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1855 {
1856 struct net *net;
1857 LIST_HEAD(list);
1858
1859 rtnl_lock();
1860 list_for_each_entry(net, net_list, exit_list)
1861 geneve_destroy_tunnels(net, &list);
1862
1863 /* unregister the devices gathered above */
1864 unregister_netdevice_many(&list);
1865 rtnl_unlock();
1866 }
1867
1868 static struct pernet_operations geneve_net_ops = {
1869 .init = geneve_init_net,
1870 .exit_batch = geneve_exit_batch_net,
1871 .id = &geneve_net_id,
1872 .size = sizeof(struct geneve_net),
1873 };
1874
1875 static int __init geneve_init_module(void)
1876 {
1877 int rc;
1878
1879 rc = register_pernet_subsys(&geneve_net_ops);
1880 if (rc)
1881 goto out1;
1882
1883 rc = register_netdevice_notifier(&geneve_notifier_block);
1884 if (rc)
1885 goto out2;
1886
1887 rc = rtnl_link_register(&geneve_link_ops);
1888 if (rc)
1889 goto out3;
1890
1891 return 0;
1892 out3:
1893 unregister_netdevice_notifier(&geneve_notifier_block);
1894 out2:
1895 unregister_pernet_subsys(&geneve_net_ops);
1896 out1:
1897 return rc;
1898 }
1899 late_initcall(geneve_init_module);
1900
1901 static void __exit geneve_cleanup_module(void)
1902 {
1903 rtnl_link_unregister(&geneve_link_ops);
1904 unregister_netdevice_notifier(&geneve_notifier_block);
1905 unregister_pernet_subsys(&geneve_net_ops);
1906 }
1907 module_exit(geneve_cleanup_module);
1908
1909 MODULE_LICENSE("GPL");
1910 MODULE_VERSION(GENEVE_NETDEV_VER);
1911 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1912 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1913 MODULE_ALIAS_RTNL_LINK("geneve");
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