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Merge tag 'selinux-pr-20200416' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-jammy-kernel.git] / drivers / net / geneve.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * GENEVE: Generic Network Virtualization Encapsulation
4 *
5 * Copyright (c) 2015 Red Hat, Inc.
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/etherdevice.h>
13 #include <linux/hash.h>
14 #include <net/ipv6_stubs.h>
15 #include <net/dst_metadata.h>
16 #include <net/gro_cells.h>
17 #include <net/rtnetlink.h>
18 #include <net/geneve.h>
19 #include <net/protocol.h>
20
21 #define GENEVE_NETDEV_VER "0.6"
22
23 #define GENEVE_N_VID (1u << 24)
24 #define GENEVE_VID_MASK (GENEVE_N_VID - 1)
25
26 #define VNI_HASH_BITS 10
27 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
28
29 static bool log_ecn_error = true;
30 module_param(log_ecn_error, bool, 0644);
31 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
32
33 #define GENEVE_VER 0
34 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
35 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
36 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
37
38 /* per-network namespace private data for this module */
39 struct geneve_net {
40 struct list_head geneve_list;
41 struct list_head sock_list;
42 };
43
44 static unsigned int geneve_net_id;
45
46 struct geneve_dev_node {
47 struct hlist_node hlist;
48 struct geneve_dev *geneve;
49 };
50
51 /* Pseudo network device */
52 struct geneve_dev {
53 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
54 #if IS_ENABLED(CONFIG_IPV6)
55 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
56 #endif
57 struct net *net; /* netns for packet i/o */
58 struct net_device *dev; /* netdev for geneve tunnel */
59 struct ip_tunnel_info info;
60 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
61 #if IS_ENABLED(CONFIG_IPV6)
62 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
63 #endif
64 struct list_head next; /* geneve's per namespace list */
65 struct gro_cells gro_cells;
66 bool collect_md;
67 bool use_udp6_rx_checksums;
68 bool ttl_inherit;
69 enum ifla_geneve_df df;
70 };
71
72 struct geneve_sock {
73 bool collect_md;
74 struct list_head list;
75 struct socket *sock;
76 struct rcu_head rcu;
77 int refcnt;
78 struct hlist_head vni_list[VNI_HASH_SIZE];
79 };
80
81 static inline __u32 geneve_net_vni_hash(u8 vni[3])
82 {
83 __u32 vnid;
84
85 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
86 return hash_32(vnid, VNI_HASH_BITS);
87 }
88
89 static __be64 vni_to_tunnel_id(const __u8 *vni)
90 {
91 #ifdef __BIG_ENDIAN
92 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
93 #else
94 return (__force __be64)(((__force u64)vni[0] << 40) |
95 ((__force u64)vni[1] << 48) |
96 ((__force u64)vni[2] << 56));
97 #endif
98 }
99
100 /* Convert 64 bit tunnel ID to 24 bit VNI. */
101 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
102 {
103 #ifdef __BIG_ENDIAN
104 vni[0] = (__force __u8)(tun_id >> 16);
105 vni[1] = (__force __u8)(tun_id >> 8);
106 vni[2] = (__force __u8)tun_id;
107 #else
108 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
109 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
110 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
111 #endif
112 }
113
114 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
115 {
116 return !memcmp(vni, &tun_id[5], 3);
117 }
118
119 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
120 {
121 return gs->sock->sk->sk_family;
122 }
123
124 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
125 __be32 addr, u8 vni[])
126 {
127 struct hlist_head *vni_list_head;
128 struct geneve_dev_node *node;
129 __u32 hash;
130
131 /* Find the device for this VNI */
132 hash = geneve_net_vni_hash(vni);
133 vni_list_head = &gs->vni_list[hash];
134 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
135 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
136 addr == node->geneve->info.key.u.ipv4.dst)
137 return node->geneve;
138 }
139 return NULL;
140 }
141
142 #if IS_ENABLED(CONFIG_IPV6)
143 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
144 struct in6_addr addr6, u8 vni[])
145 {
146 struct hlist_head *vni_list_head;
147 struct geneve_dev_node *node;
148 __u32 hash;
149
150 /* Find the device for this VNI */
151 hash = geneve_net_vni_hash(vni);
152 vni_list_head = &gs->vni_list[hash];
153 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
154 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
155 ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
156 return node->geneve;
157 }
158 return NULL;
159 }
160 #endif
161
162 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
163 {
164 return (struct genevehdr *)(udp_hdr(skb) + 1);
165 }
166
167 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
168 struct sk_buff *skb)
169 {
170 static u8 zero_vni[3];
171 u8 *vni;
172
173 if (geneve_get_sk_family(gs) == AF_INET) {
174 struct iphdr *iph;
175 __be32 addr;
176
177 iph = ip_hdr(skb); /* outer IP header... */
178
179 if (gs->collect_md) {
180 vni = zero_vni;
181 addr = 0;
182 } else {
183 vni = geneve_hdr(skb)->vni;
184 addr = iph->saddr;
185 }
186
187 return geneve_lookup(gs, addr, vni);
188 #if IS_ENABLED(CONFIG_IPV6)
189 } else if (geneve_get_sk_family(gs) == AF_INET6) {
190 static struct in6_addr zero_addr6;
191 struct ipv6hdr *ip6h;
192 struct in6_addr addr6;
193
194 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
195
196 if (gs->collect_md) {
197 vni = zero_vni;
198 addr6 = zero_addr6;
199 } else {
200 vni = geneve_hdr(skb)->vni;
201 addr6 = ip6h->saddr;
202 }
203
204 return geneve6_lookup(gs, addr6, vni);
205 #endif
206 }
207 return NULL;
208 }
209
210 /* geneve receive/decap routine */
211 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
212 struct sk_buff *skb)
213 {
214 struct genevehdr *gnvh = geneve_hdr(skb);
215 struct metadata_dst *tun_dst = NULL;
216 struct pcpu_sw_netstats *stats;
217 unsigned int len;
218 int err = 0;
219 void *oiph;
220
221 if (ip_tunnel_collect_metadata() || gs->collect_md) {
222 __be16 flags;
223
224 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
225 (gnvh->oam ? TUNNEL_OAM : 0) |
226 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
227
228 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
229 vni_to_tunnel_id(gnvh->vni),
230 gnvh->opt_len * 4);
231 if (!tun_dst) {
232 geneve->dev->stats.rx_dropped++;
233 goto drop;
234 }
235 /* Update tunnel dst according to Geneve options. */
236 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
237 gnvh->options, gnvh->opt_len * 4,
238 TUNNEL_GENEVE_OPT);
239 } else {
240 /* Drop packets w/ critical options,
241 * since we don't support any...
242 */
243 if (gnvh->critical) {
244 geneve->dev->stats.rx_frame_errors++;
245 geneve->dev->stats.rx_errors++;
246 goto drop;
247 }
248 }
249
250 skb_reset_mac_header(skb);
251 skb->protocol = eth_type_trans(skb, geneve->dev);
252 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
253
254 if (tun_dst)
255 skb_dst_set(skb, &tun_dst->dst);
256
257 /* Ignore packet loops (and multicast echo) */
258 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
259 geneve->dev->stats.rx_errors++;
260 goto drop;
261 }
262
263 oiph = skb_network_header(skb);
264 skb_reset_network_header(skb);
265
266 if (geneve_get_sk_family(gs) == AF_INET)
267 err = IP_ECN_decapsulate(oiph, skb);
268 #if IS_ENABLED(CONFIG_IPV6)
269 else
270 err = IP6_ECN_decapsulate(oiph, skb);
271 #endif
272
273 if (unlikely(err)) {
274 if (log_ecn_error) {
275 if (geneve_get_sk_family(gs) == AF_INET)
276 net_info_ratelimited("non-ECT from %pI4 "
277 "with TOS=%#x\n",
278 &((struct iphdr *)oiph)->saddr,
279 ((struct iphdr *)oiph)->tos);
280 #if IS_ENABLED(CONFIG_IPV6)
281 else
282 net_info_ratelimited("non-ECT from %pI6\n",
283 &((struct ipv6hdr *)oiph)->saddr);
284 #endif
285 }
286 if (err > 1) {
287 ++geneve->dev->stats.rx_frame_errors;
288 ++geneve->dev->stats.rx_errors;
289 goto drop;
290 }
291 }
292
293 len = skb->len;
294 err = gro_cells_receive(&geneve->gro_cells, skb);
295 if (likely(err == NET_RX_SUCCESS)) {
296 stats = this_cpu_ptr(geneve->dev->tstats);
297 u64_stats_update_begin(&stats->syncp);
298 stats->rx_packets++;
299 stats->rx_bytes += len;
300 u64_stats_update_end(&stats->syncp);
301 }
302 return;
303 drop:
304 /* Consume bad packet */
305 kfree_skb(skb);
306 }
307
308 /* Setup stats when device is created */
309 static int geneve_init(struct net_device *dev)
310 {
311 struct geneve_dev *geneve = netdev_priv(dev);
312 int err;
313
314 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
315 if (!dev->tstats)
316 return -ENOMEM;
317
318 err = gro_cells_init(&geneve->gro_cells, dev);
319 if (err) {
320 free_percpu(dev->tstats);
321 return err;
322 }
323
324 err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
325 if (err) {
326 free_percpu(dev->tstats);
327 gro_cells_destroy(&geneve->gro_cells);
328 return err;
329 }
330 return 0;
331 }
332
333 static void geneve_uninit(struct net_device *dev)
334 {
335 struct geneve_dev *geneve = netdev_priv(dev);
336
337 dst_cache_destroy(&geneve->info.dst_cache);
338 gro_cells_destroy(&geneve->gro_cells);
339 free_percpu(dev->tstats);
340 }
341
342 /* Callback from net/ipv4/udp.c to receive packets */
343 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
344 {
345 struct genevehdr *geneveh;
346 struct geneve_dev *geneve;
347 struct geneve_sock *gs;
348 int opts_len;
349
350 /* Need UDP and Geneve header to be present */
351 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
352 goto drop;
353
354 /* Return packets with reserved bits set */
355 geneveh = geneve_hdr(skb);
356 if (unlikely(geneveh->ver != GENEVE_VER))
357 goto drop;
358
359 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
360 goto drop;
361
362 gs = rcu_dereference_sk_user_data(sk);
363 if (!gs)
364 goto drop;
365
366 geneve = geneve_lookup_skb(gs, skb);
367 if (!geneve)
368 goto drop;
369
370 opts_len = geneveh->opt_len * 4;
371 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
372 htons(ETH_P_TEB),
373 !net_eq(geneve->net, dev_net(geneve->dev)))) {
374 geneve->dev->stats.rx_dropped++;
375 goto drop;
376 }
377
378 geneve_rx(geneve, gs, skb);
379 return 0;
380
381 drop:
382 /* Consume bad packet */
383 kfree_skb(skb);
384 return 0;
385 }
386
387 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
388 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
389 {
390 struct genevehdr *geneveh;
391 struct geneve_sock *gs;
392 u8 zero_vni[3] = { 0 };
393 u8 *vni = zero_vni;
394
395 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
396 return -EINVAL;
397
398 geneveh = geneve_hdr(skb);
399 if (geneveh->ver != GENEVE_VER)
400 return -EINVAL;
401
402 if (geneveh->proto_type != htons(ETH_P_TEB))
403 return -EINVAL;
404
405 gs = rcu_dereference_sk_user_data(sk);
406 if (!gs)
407 return -ENOENT;
408
409 if (geneve_get_sk_family(gs) == AF_INET) {
410 struct iphdr *iph = ip_hdr(skb);
411 __be32 addr4 = 0;
412
413 if (!gs->collect_md) {
414 vni = geneve_hdr(skb)->vni;
415 addr4 = iph->daddr;
416 }
417
418 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
419 }
420
421 #if IS_ENABLED(CONFIG_IPV6)
422 if (geneve_get_sk_family(gs) == AF_INET6) {
423 struct ipv6hdr *ip6h = ipv6_hdr(skb);
424 struct in6_addr addr6;
425
426 memset(&addr6, 0, sizeof(struct in6_addr));
427
428 if (!gs->collect_md) {
429 vni = geneve_hdr(skb)->vni;
430 addr6 = ip6h->daddr;
431 }
432
433 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
434 }
435 #endif
436
437 return -EPFNOSUPPORT;
438 }
439
440 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
441 __be16 port, bool ipv6_rx_csum)
442 {
443 struct socket *sock;
444 struct udp_port_cfg udp_conf;
445 int err;
446
447 memset(&udp_conf, 0, sizeof(udp_conf));
448
449 if (ipv6) {
450 udp_conf.family = AF_INET6;
451 udp_conf.ipv6_v6only = 1;
452 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
453 } else {
454 udp_conf.family = AF_INET;
455 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
456 }
457
458 udp_conf.local_udp_port = port;
459
460 /* Open UDP socket */
461 err = udp_sock_create(net, &udp_conf, &sock);
462 if (err < 0)
463 return ERR_PTR(err);
464
465 return sock;
466 }
467
468 static int geneve_hlen(struct genevehdr *gh)
469 {
470 return sizeof(*gh) + gh->opt_len * 4;
471 }
472
473 static struct sk_buff *geneve_gro_receive(struct sock *sk,
474 struct list_head *head,
475 struct sk_buff *skb)
476 {
477 struct sk_buff *pp = NULL;
478 struct sk_buff *p;
479 struct genevehdr *gh, *gh2;
480 unsigned int hlen, gh_len, off_gnv;
481 const struct packet_offload *ptype;
482 __be16 type;
483 int flush = 1;
484
485 off_gnv = skb_gro_offset(skb);
486 hlen = off_gnv + sizeof(*gh);
487 gh = skb_gro_header_fast(skb, off_gnv);
488 if (skb_gro_header_hard(skb, hlen)) {
489 gh = skb_gro_header_slow(skb, hlen, off_gnv);
490 if (unlikely(!gh))
491 goto out;
492 }
493
494 if (gh->ver != GENEVE_VER || gh->oam)
495 goto out;
496 gh_len = geneve_hlen(gh);
497
498 hlen = off_gnv + gh_len;
499 if (skb_gro_header_hard(skb, hlen)) {
500 gh = skb_gro_header_slow(skb, hlen, off_gnv);
501 if (unlikely(!gh))
502 goto out;
503 }
504
505 list_for_each_entry(p, head, list) {
506 if (!NAPI_GRO_CB(p)->same_flow)
507 continue;
508
509 gh2 = (struct genevehdr *)(p->data + off_gnv);
510 if (gh->opt_len != gh2->opt_len ||
511 memcmp(gh, gh2, gh_len)) {
512 NAPI_GRO_CB(p)->same_flow = 0;
513 continue;
514 }
515 }
516
517 type = gh->proto_type;
518
519 rcu_read_lock();
520 ptype = gro_find_receive_by_type(type);
521 if (!ptype)
522 goto out_unlock;
523
524 skb_gro_pull(skb, gh_len);
525 skb_gro_postpull_rcsum(skb, gh, gh_len);
526 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
527 flush = 0;
528
529 out_unlock:
530 rcu_read_unlock();
531 out:
532 skb_gro_flush_final(skb, pp, flush);
533
534 return pp;
535 }
536
537 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
538 int nhoff)
539 {
540 struct genevehdr *gh;
541 struct packet_offload *ptype;
542 __be16 type;
543 int gh_len;
544 int err = -ENOSYS;
545
546 gh = (struct genevehdr *)(skb->data + nhoff);
547 gh_len = geneve_hlen(gh);
548 type = gh->proto_type;
549
550 rcu_read_lock();
551 ptype = gro_find_complete_by_type(type);
552 if (ptype)
553 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
554
555 rcu_read_unlock();
556
557 skb_set_inner_mac_header(skb, nhoff + gh_len);
558
559 return err;
560 }
561
562 /* Create new listen socket if needed */
563 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
564 bool ipv6, bool ipv6_rx_csum)
565 {
566 struct geneve_net *gn = net_generic(net, geneve_net_id);
567 struct geneve_sock *gs;
568 struct socket *sock;
569 struct udp_tunnel_sock_cfg tunnel_cfg;
570 int h;
571
572 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
573 if (!gs)
574 return ERR_PTR(-ENOMEM);
575
576 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
577 if (IS_ERR(sock)) {
578 kfree(gs);
579 return ERR_CAST(sock);
580 }
581
582 gs->sock = sock;
583 gs->refcnt = 1;
584 for (h = 0; h < VNI_HASH_SIZE; ++h)
585 INIT_HLIST_HEAD(&gs->vni_list[h]);
586
587 /* Initialize the geneve udp offloads structure */
588 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
589
590 /* Mark socket as an encapsulation socket */
591 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
592 tunnel_cfg.sk_user_data = gs;
593 tunnel_cfg.encap_type = 1;
594 tunnel_cfg.gro_receive = geneve_gro_receive;
595 tunnel_cfg.gro_complete = geneve_gro_complete;
596 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
597 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
598 tunnel_cfg.encap_destroy = NULL;
599 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
600 list_add(&gs->list, &gn->sock_list);
601 return gs;
602 }
603
604 static void __geneve_sock_release(struct geneve_sock *gs)
605 {
606 if (!gs || --gs->refcnt)
607 return;
608
609 list_del(&gs->list);
610 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
611 udp_tunnel_sock_release(gs->sock);
612 kfree_rcu(gs, rcu);
613 }
614
615 static void geneve_sock_release(struct geneve_dev *geneve)
616 {
617 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
618 #if IS_ENABLED(CONFIG_IPV6)
619 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
620
621 rcu_assign_pointer(geneve->sock6, NULL);
622 #endif
623
624 rcu_assign_pointer(geneve->sock4, NULL);
625 synchronize_net();
626
627 __geneve_sock_release(gs4);
628 #if IS_ENABLED(CONFIG_IPV6)
629 __geneve_sock_release(gs6);
630 #endif
631 }
632
633 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
634 sa_family_t family,
635 __be16 dst_port)
636 {
637 struct geneve_sock *gs;
638
639 list_for_each_entry(gs, &gn->sock_list, list) {
640 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
641 geneve_get_sk_family(gs) == family) {
642 return gs;
643 }
644 }
645 return NULL;
646 }
647
648 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
649 {
650 struct net *net = geneve->net;
651 struct geneve_net *gn = net_generic(net, geneve_net_id);
652 struct geneve_dev_node *node;
653 struct geneve_sock *gs;
654 __u8 vni[3];
655 __u32 hash;
656
657 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
658 if (gs) {
659 gs->refcnt++;
660 goto out;
661 }
662
663 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
664 geneve->use_udp6_rx_checksums);
665 if (IS_ERR(gs))
666 return PTR_ERR(gs);
667
668 out:
669 gs->collect_md = geneve->collect_md;
670 #if IS_ENABLED(CONFIG_IPV6)
671 if (ipv6) {
672 rcu_assign_pointer(geneve->sock6, gs);
673 node = &geneve->hlist6;
674 } else
675 #endif
676 {
677 rcu_assign_pointer(geneve->sock4, gs);
678 node = &geneve->hlist4;
679 }
680 node->geneve = geneve;
681
682 tunnel_id_to_vni(geneve->info.key.tun_id, vni);
683 hash = geneve_net_vni_hash(vni);
684 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
685 return 0;
686 }
687
688 static int geneve_open(struct net_device *dev)
689 {
690 struct geneve_dev *geneve = netdev_priv(dev);
691 bool metadata = geneve->collect_md;
692 bool ipv4, ipv6;
693 int ret = 0;
694
695 ipv6 = geneve->info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
696 ipv4 = !ipv6 || metadata;
697 #if IS_ENABLED(CONFIG_IPV6)
698 if (ipv6) {
699 ret = geneve_sock_add(geneve, true);
700 if (ret < 0 && ret != -EAFNOSUPPORT)
701 ipv4 = false;
702 }
703 #endif
704 if (ipv4)
705 ret = geneve_sock_add(geneve, false);
706 if (ret < 0)
707 geneve_sock_release(geneve);
708
709 return ret;
710 }
711
712 static int geneve_stop(struct net_device *dev)
713 {
714 struct geneve_dev *geneve = netdev_priv(dev);
715
716 hlist_del_init_rcu(&geneve->hlist4.hlist);
717 #if IS_ENABLED(CONFIG_IPV6)
718 hlist_del_init_rcu(&geneve->hlist6.hlist);
719 #endif
720 geneve_sock_release(geneve);
721 return 0;
722 }
723
724 static void geneve_build_header(struct genevehdr *geneveh,
725 const struct ip_tunnel_info *info)
726 {
727 geneveh->ver = GENEVE_VER;
728 geneveh->opt_len = info->options_len / 4;
729 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
730 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
731 geneveh->rsvd1 = 0;
732 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
733 geneveh->proto_type = htons(ETH_P_TEB);
734 geneveh->rsvd2 = 0;
735
736 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
737 ip_tunnel_info_opts_get(geneveh->options, info);
738 }
739
740 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
741 const struct ip_tunnel_info *info,
742 bool xnet, int ip_hdr_len)
743 {
744 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
745 struct genevehdr *gnvh;
746 int min_headroom;
747 int err;
748
749 skb_reset_mac_header(skb);
750 skb_scrub_packet(skb, xnet);
751
752 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
753 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
754 err = skb_cow_head(skb, min_headroom);
755 if (unlikely(err))
756 goto free_dst;
757
758 err = udp_tunnel_handle_offloads(skb, udp_sum);
759 if (err)
760 goto free_dst;
761
762 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
763 geneve_build_header(gnvh, info);
764 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
765 return 0;
766
767 free_dst:
768 dst_release(dst);
769 return err;
770 }
771
772 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
773 struct net_device *dev,
774 struct geneve_sock *gs4,
775 struct flowi4 *fl4,
776 const struct ip_tunnel_info *info)
777 {
778 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
779 struct geneve_dev *geneve = netdev_priv(dev);
780 struct dst_cache *dst_cache;
781 struct rtable *rt = NULL;
782 __u8 tos;
783
784 if (!gs4)
785 return ERR_PTR(-EIO);
786
787 memset(fl4, 0, sizeof(*fl4));
788 fl4->flowi4_mark = skb->mark;
789 fl4->flowi4_proto = IPPROTO_UDP;
790 fl4->daddr = info->key.u.ipv4.dst;
791 fl4->saddr = info->key.u.ipv4.src;
792
793 tos = info->key.tos;
794 if ((tos == 1) && !geneve->collect_md) {
795 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
796 use_cache = false;
797 }
798 fl4->flowi4_tos = RT_TOS(tos);
799
800 dst_cache = (struct dst_cache *)&info->dst_cache;
801 if (use_cache) {
802 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
803 if (rt)
804 return rt;
805 }
806 rt = ip_route_output_key(geneve->net, fl4);
807 if (IS_ERR(rt)) {
808 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
809 return ERR_PTR(-ENETUNREACH);
810 }
811 if (rt->dst.dev == dev) { /* is this necessary? */
812 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
813 ip_rt_put(rt);
814 return ERR_PTR(-ELOOP);
815 }
816 if (use_cache)
817 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
818 return rt;
819 }
820
821 #if IS_ENABLED(CONFIG_IPV6)
822 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
823 struct net_device *dev,
824 struct geneve_sock *gs6,
825 struct flowi6 *fl6,
826 const struct ip_tunnel_info *info)
827 {
828 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
829 struct geneve_dev *geneve = netdev_priv(dev);
830 struct dst_entry *dst = NULL;
831 struct dst_cache *dst_cache;
832 __u8 prio;
833
834 if (!gs6)
835 return ERR_PTR(-EIO);
836
837 memset(fl6, 0, sizeof(*fl6));
838 fl6->flowi6_mark = skb->mark;
839 fl6->flowi6_proto = IPPROTO_UDP;
840 fl6->daddr = info->key.u.ipv6.dst;
841 fl6->saddr = info->key.u.ipv6.src;
842 prio = info->key.tos;
843 if ((prio == 1) && !geneve->collect_md) {
844 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
845 use_cache = false;
846 }
847
848 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
849 info->key.label);
850 dst_cache = (struct dst_cache *)&info->dst_cache;
851 if (use_cache) {
852 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
853 if (dst)
854 return dst;
855 }
856 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
857 NULL);
858 if (IS_ERR(dst)) {
859 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
860 return ERR_PTR(-ENETUNREACH);
861 }
862 if (dst->dev == dev) { /* is this necessary? */
863 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
864 dst_release(dst);
865 return ERR_PTR(-ELOOP);
866 }
867
868 if (use_cache)
869 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
870 return dst;
871 }
872 #endif
873
874 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
875 struct geneve_dev *geneve,
876 const struct ip_tunnel_info *info)
877 {
878 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
879 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
880 const struct ip_tunnel_key *key = &info->key;
881 struct rtable *rt;
882 struct flowi4 fl4;
883 __u8 tos, ttl;
884 __be16 df = 0;
885 __be16 sport;
886 int err;
887
888 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
889 if (IS_ERR(rt))
890 return PTR_ERR(rt);
891
892 skb_tunnel_check_pmtu(skb, &rt->dst,
893 GENEVE_IPV4_HLEN + info->options_len);
894
895 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
896 if (geneve->collect_md) {
897 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
898 ttl = key->ttl;
899
900 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
901 } else {
902 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
903 if (geneve->ttl_inherit)
904 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
905 else
906 ttl = key->ttl;
907 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
908
909 if (geneve->df == GENEVE_DF_SET) {
910 df = htons(IP_DF);
911 } else if (geneve->df == GENEVE_DF_INHERIT) {
912 struct ethhdr *eth = eth_hdr(skb);
913
914 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
915 df = htons(IP_DF);
916 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
917 struct iphdr *iph = ip_hdr(skb);
918
919 if (iph->frag_off & htons(IP_DF))
920 df = htons(IP_DF);
921 }
922 }
923 }
924
925 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
926 if (unlikely(err))
927 return err;
928
929 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
930 tos, ttl, df, sport, geneve->info.key.tp_dst,
931 !net_eq(geneve->net, dev_net(geneve->dev)),
932 !(info->key.tun_flags & TUNNEL_CSUM));
933 return 0;
934 }
935
936 #if IS_ENABLED(CONFIG_IPV6)
937 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
938 struct geneve_dev *geneve,
939 const struct ip_tunnel_info *info)
940 {
941 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
942 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
943 const struct ip_tunnel_key *key = &info->key;
944 struct dst_entry *dst = NULL;
945 struct flowi6 fl6;
946 __u8 prio, ttl;
947 __be16 sport;
948 int err;
949
950 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
951 if (IS_ERR(dst))
952 return PTR_ERR(dst);
953
954 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
955
956 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
957 if (geneve->collect_md) {
958 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
959 ttl = key->ttl;
960 } else {
961 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
962 ip_hdr(skb), skb);
963 if (geneve->ttl_inherit)
964 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
965 else
966 ttl = key->ttl;
967 ttl = ttl ? : ip6_dst_hoplimit(dst);
968 }
969 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
970 if (unlikely(err))
971 return err;
972
973 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
974 &fl6.saddr, &fl6.daddr, prio, ttl,
975 info->key.label, sport, geneve->info.key.tp_dst,
976 !(info->key.tun_flags & TUNNEL_CSUM));
977 return 0;
978 }
979 #endif
980
981 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
982 {
983 struct geneve_dev *geneve = netdev_priv(dev);
984 struct ip_tunnel_info *info = NULL;
985 int err;
986
987 if (geneve->collect_md) {
988 info = skb_tunnel_info(skb);
989 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
990 err = -EINVAL;
991 netdev_dbg(dev, "no tunnel metadata\n");
992 goto tx_error;
993 }
994 } else {
995 info = &geneve->info;
996 }
997
998 rcu_read_lock();
999 #if IS_ENABLED(CONFIG_IPV6)
1000 if (info->mode & IP_TUNNEL_INFO_IPV6)
1001 err = geneve6_xmit_skb(skb, dev, geneve, info);
1002 else
1003 #endif
1004 err = geneve_xmit_skb(skb, dev, geneve, info);
1005 rcu_read_unlock();
1006
1007 if (likely(!err))
1008 return NETDEV_TX_OK;
1009 tx_error:
1010 dev_kfree_skb(skb);
1011
1012 if (err == -ELOOP)
1013 dev->stats.collisions++;
1014 else if (err == -ENETUNREACH)
1015 dev->stats.tx_carrier_errors++;
1016
1017 dev->stats.tx_errors++;
1018 return NETDEV_TX_OK;
1019 }
1020
1021 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1022 {
1023 if (new_mtu > dev->max_mtu)
1024 new_mtu = dev->max_mtu;
1025 else if (new_mtu < dev->min_mtu)
1026 new_mtu = dev->min_mtu;
1027
1028 dev->mtu = new_mtu;
1029 return 0;
1030 }
1031
1032 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1033 {
1034 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1035 struct geneve_dev *geneve = netdev_priv(dev);
1036
1037 if (ip_tunnel_info_af(info) == AF_INET) {
1038 struct rtable *rt;
1039 struct flowi4 fl4;
1040 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1041
1042 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
1043 if (IS_ERR(rt))
1044 return PTR_ERR(rt);
1045
1046 ip_rt_put(rt);
1047 info->key.u.ipv4.src = fl4.saddr;
1048 #if IS_ENABLED(CONFIG_IPV6)
1049 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1050 struct dst_entry *dst;
1051 struct flowi6 fl6;
1052 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1053
1054 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
1055 if (IS_ERR(dst))
1056 return PTR_ERR(dst);
1057
1058 dst_release(dst);
1059 info->key.u.ipv6.src = fl6.saddr;
1060 #endif
1061 } else {
1062 return -EINVAL;
1063 }
1064
1065 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1066 1, USHRT_MAX, true);
1067 info->key.tp_dst = geneve->info.key.tp_dst;
1068 return 0;
1069 }
1070
1071 static const struct net_device_ops geneve_netdev_ops = {
1072 .ndo_init = geneve_init,
1073 .ndo_uninit = geneve_uninit,
1074 .ndo_open = geneve_open,
1075 .ndo_stop = geneve_stop,
1076 .ndo_start_xmit = geneve_xmit,
1077 .ndo_get_stats64 = ip_tunnel_get_stats64,
1078 .ndo_change_mtu = geneve_change_mtu,
1079 .ndo_validate_addr = eth_validate_addr,
1080 .ndo_set_mac_address = eth_mac_addr,
1081 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1082 };
1083
1084 static void geneve_get_drvinfo(struct net_device *dev,
1085 struct ethtool_drvinfo *drvinfo)
1086 {
1087 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1088 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1089 }
1090
1091 static const struct ethtool_ops geneve_ethtool_ops = {
1092 .get_drvinfo = geneve_get_drvinfo,
1093 .get_link = ethtool_op_get_link,
1094 };
1095
1096 /* Info for udev, that this is a virtual tunnel endpoint */
1097 static struct device_type geneve_type = {
1098 .name = "geneve",
1099 };
1100
1101 /* Calls the ndo_udp_tunnel_add of the caller in order to
1102 * supply the listening GENEVE udp ports. Callers are expected
1103 * to implement the ndo_udp_tunnel_add.
1104 */
1105 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1106 {
1107 struct net *net = dev_net(dev);
1108 struct geneve_net *gn = net_generic(net, geneve_net_id);
1109 struct geneve_sock *gs;
1110
1111 rcu_read_lock();
1112 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1113 if (push) {
1114 udp_tunnel_push_rx_port(dev, gs->sock,
1115 UDP_TUNNEL_TYPE_GENEVE);
1116 } else {
1117 udp_tunnel_drop_rx_port(dev, gs->sock,
1118 UDP_TUNNEL_TYPE_GENEVE);
1119 }
1120 }
1121 rcu_read_unlock();
1122 }
1123
1124 /* Initialize the device structure. */
1125 static void geneve_setup(struct net_device *dev)
1126 {
1127 ether_setup(dev);
1128
1129 dev->netdev_ops = &geneve_netdev_ops;
1130 dev->ethtool_ops = &geneve_ethtool_ops;
1131 dev->needs_free_netdev = true;
1132
1133 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1134
1135 dev->features |= NETIF_F_LLTX;
1136 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1137 dev->features |= NETIF_F_RXCSUM;
1138 dev->features |= NETIF_F_GSO_SOFTWARE;
1139
1140 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1141 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1142
1143 /* MTU range: 68 - (something less than 65535) */
1144 dev->min_mtu = ETH_MIN_MTU;
1145 /* The max_mtu calculation does not take account of GENEVE
1146 * options, to avoid excluding potentially valid
1147 * configurations. This will be further reduced by IPvX hdr size.
1148 */
1149 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1150
1151 netif_keep_dst(dev);
1152 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1153 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1154 eth_hw_addr_random(dev);
1155 }
1156
1157 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1158 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1159 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1160 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1161 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1162 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1163 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1164 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1165 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1166 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1167 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1168 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1169 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1170 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1171 };
1172
1173 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1174 struct netlink_ext_ack *extack)
1175 {
1176 if (tb[IFLA_ADDRESS]) {
1177 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1178 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1179 "Provided link layer address is not Ethernet");
1180 return -EINVAL;
1181 }
1182
1183 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1184 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1185 "Provided Ethernet address is not unicast");
1186 return -EADDRNOTAVAIL;
1187 }
1188 }
1189
1190 if (!data) {
1191 NL_SET_ERR_MSG(extack,
1192 "Not enough attributes provided to perform the operation");
1193 return -EINVAL;
1194 }
1195
1196 if (data[IFLA_GENEVE_ID]) {
1197 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1198
1199 if (vni >= GENEVE_N_VID) {
1200 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1201 "Geneve ID must be lower than 16777216");
1202 return -ERANGE;
1203 }
1204 }
1205
1206 if (data[IFLA_GENEVE_DF]) {
1207 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1208
1209 if (df < 0 || df > GENEVE_DF_MAX) {
1210 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF],
1211 "Invalid DF attribute");
1212 return -EINVAL;
1213 }
1214 }
1215
1216 return 0;
1217 }
1218
1219 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1220 const struct ip_tunnel_info *info,
1221 bool *tun_on_same_port,
1222 bool *tun_collect_md)
1223 {
1224 struct geneve_dev *geneve, *t = NULL;
1225
1226 *tun_on_same_port = false;
1227 *tun_collect_md = false;
1228 list_for_each_entry(geneve, &gn->geneve_list, next) {
1229 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1230 *tun_collect_md = geneve->collect_md;
1231 *tun_on_same_port = true;
1232 }
1233 if (info->key.tun_id == geneve->info.key.tun_id &&
1234 info->key.tp_dst == geneve->info.key.tp_dst &&
1235 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1236 t = geneve;
1237 }
1238 return t;
1239 }
1240
1241 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1242 {
1243 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1244 info->key.ttl || info->key.label || info->key.tp_src ||
1245 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1246 }
1247
1248 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1249 struct ip_tunnel_info *b)
1250 {
1251 if (ip_tunnel_info_af(a) == AF_INET)
1252 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1253 else
1254 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1255 }
1256
1257 static int geneve_configure(struct net *net, struct net_device *dev,
1258 struct netlink_ext_ack *extack,
1259 const struct ip_tunnel_info *info,
1260 bool metadata, bool ipv6_rx_csum,
1261 bool ttl_inherit, enum ifla_geneve_df df)
1262 {
1263 struct geneve_net *gn = net_generic(net, geneve_net_id);
1264 struct geneve_dev *t, *geneve = netdev_priv(dev);
1265 bool tun_collect_md, tun_on_same_port;
1266 int err, encap_len;
1267
1268 if (metadata && !is_tnl_info_zero(info)) {
1269 NL_SET_ERR_MSG(extack,
1270 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1271 return -EINVAL;
1272 }
1273
1274 geneve->net = net;
1275 geneve->dev = dev;
1276
1277 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1278 if (t)
1279 return -EBUSY;
1280
1281 /* make enough headroom for basic scenario */
1282 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1283 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1284 encap_len += sizeof(struct iphdr);
1285 dev->max_mtu -= sizeof(struct iphdr);
1286 } else {
1287 encap_len += sizeof(struct ipv6hdr);
1288 dev->max_mtu -= sizeof(struct ipv6hdr);
1289 }
1290 dev->needed_headroom = encap_len + ETH_HLEN;
1291
1292 if (metadata) {
1293 if (tun_on_same_port) {
1294 NL_SET_ERR_MSG(extack,
1295 "There can be only one externally controlled device on a destination port");
1296 return -EPERM;
1297 }
1298 } else {
1299 if (tun_collect_md) {
1300 NL_SET_ERR_MSG(extack,
1301 "There already exists an externally controlled device on this destination port");
1302 return -EPERM;
1303 }
1304 }
1305
1306 dst_cache_reset(&geneve->info.dst_cache);
1307 geneve->info = *info;
1308 geneve->collect_md = metadata;
1309 geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1310 geneve->ttl_inherit = ttl_inherit;
1311 geneve->df = df;
1312
1313 err = register_netdevice(dev);
1314 if (err)
1315 return err;
1316
1317 list_add(&geneve->next, &gn->geneve_list);
1318 return 0;
1319 }
1320
1321 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1322 {
1323 memset(info, 0, sizeof(*info));
1324 info->key.tp_dst = htons(dst_port);
1325 }
1326
1327 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1328 struct netlink_ext_ack *extack,
1329 struct ip_tunnel_info *info, bool *metadata,
1330 bool *use_udp6_rx_checksums, bool *ttl_inherit,
1331 enum ifla_geneve_df *df, bool changelink)
1332 {
1333 int attrtype;
1334
1335 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1336 NL_SET_ERR_MSG(extack,
1337 "Cannot specify both IPv4 and IPv6 Remote addresses");
1338 return -EINVAL;
1339 }
1340
1341 if (data[IFLA_GENEVE_REMOTE]) {
1342 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1343 attrtype = IFLA_GENEVE_REMOTE;
1344 goto change_notsup;
1345 }
1346
1347 info->key.u.ipv4.dst =
1348 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1349
1350 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1351 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1352 "Remote IPv4 address cannot be Multicast");
1353 return -EINVAL;
1354 }
1355 }
1356
1357 if (data[IFLA_GENEVE_REMOTE6]) {
1358 #if IS_ENABLED(CONFIG_IPV6)
1359 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1360 attrtype = IFLA_GENEVE_REMOTE6;
1361 goto change_notsup;
1362 }
1363
1364 info->mode = IP_TUNNEL_INFO_IPV6;
1365 info->key.u.ipv6.dst =
1366 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1367
1368 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1369 IPV6_ADDR_LINKLOCAL) {
1370 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1371 "Remote IPv6 address cannot be link-local");
1372 return -EINVAL;
1373 }
1374 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1375 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1376 "Remote IPv6 address cannot be Multicast");
1377 return -EINVAL;
1378 }
1379 info->key.tun_flags |= TUNNEL_CSUM;
1380 *use_udp6_rx_checksums = true;
1381 #else
1382 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1383 "IPv6 support not enabled in the kernel");
1384 return -EPFNOSUPPORT;
1385 #endif
1386 }
1387
1388 if (data[IFLA_GENEVE_ID]) {
1389 __u32 vni;
1390 __u8 tvni[3];
1391 __be64 tunid;
1392
1393 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1394 tvni[0] = (vni & 0x00ff0000) >> 16;
1395 tvni[1] = (vni & 0x0000ff00) >> 8;
1396 tvni[2] = vni & 0x000000ff;
1397
1398 tunid = vni_to_tunnel_id(tvni);
1399 if (changelink && (tunid != info->key.tun_id)) {
1400 attrtype = IFLA_GENEVE_ID;
1401 goto change_notsup;
1402 }
1403 info->key.tun_id = tunid;
1404 }
1405
1406 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1407 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1408 *ttl_inherit = true;
1409 else
1410 *ttl_inherit = false;
1411 } else if (data[IFLA_GENEVE_TTL]) {
1412 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1413 *ttl_inherit = false;
1414 }
1415
1416 if (data[IFLA_GENEVE_TOS])
1417 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1418
1419 if (data[IFLA_GENEVE_DF])
1420 *df = nla_get_u8(data[IFLA_GENEVE_DF]);
1421
1422 if (data[IFLA_GENEVE_LABEL]) {
1423 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1424 IPV6_FLOWLABEL_MASK;
1425 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1426 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1427 "Label attribute only applies for IPv6 Geneve devices");
1428 return -EINVAL;
1429 }
1430 }
1431
1432 if (data[IFLA_GENEVE_PORT]) {
1433 if (changelink) {
1434 attrtype = IFLA_GENEVE_PORT;
1435 goto change_notsup;
1436 }
1437 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1438 }
1439
1440 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1441 if (changelink) {
1442 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1443 goto change_notsup;
1444 }
1445 *metadata = true;
1446 }
1447
1448 if (data[IFLA_GENEVE_UDP_CSUM]) {
1449 if (changelink) {
1450 attrtype = IFLA_GENEVE_UDP_CSUM;
1451 goto change_notsup;
1452 }
1453 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1454 info->key.tun_flags |= TUNNEL_CSUM;
1455 }
1456
1457 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1458 #if IS_ENABLED(CONFIG_IPV6)
1459 if (changelink) {
1460 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1461 goto change_notsup;
1462 }
1463 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1464 info->key.tun_flags &= ~TUNNEL_CSUM;
1465 #else
1466 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1467 "IPv6 support not enabled in the kernel");
1468 return -EPFNOSUPPORT;
1469 #endif
1470 }
1471
1472 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1473 #if IS_ENABLED(CONFIG_IPV6)
1474 if (changelink) {
1475 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1476 goto change_notsup;
1477 }
1478 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1479 *use_udp6_rx_checksums = false;
1480 #else
1481 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1482 "IPv6 support not enabled in the kernel");
1483 return -EPFNOSUPPORT;
1484 #endif
1485 }
1486
1487 return 0;
1488 change_notsup:
1489 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1490 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1491 return -EOPNOTSUPP;
1492 }
1493
1494 static void geneve_link_config(struct net_device *dev,
1495 struct ip_tunnel_info *info, struct nlattr *tb[])
1496 {
1497 struct geneve_dev *geneve = netdev_priv(dev);
1498 int ldev_mtu = 0;
1499
1500 if (tb[IFLA_MTU]) {
1501 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1502 return;
1503 }
1504
1505 switch (ip_tunnel_info_af(info)) {
1506 case AF_INET: {
1507 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1508 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1509
1510 if (!IS_ERR(rt) && rt->dst.dev) {
1511 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1512 ip_rt_put(rt);
1513 }
1514 break;
1515 }
1516 #if IS_ENABLED(CONFIG_IPV6)
1517 case AF_INET6: {
1518 struct rt6_info *rt;
1519
1520 if (!__in6_dev_get(dev))
1521 break;
1522
1523 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1524 NULL, 0);
1525
1526 if (rt && rt->dst.dev)
1527 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1528 ip6_rt_put(rt);
1529 break;
1530 }
1531 #endif
1532 }
1533
1534 if (ldev_mtu <= 0)
1535 return;
1536
1537 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1538 }
1539
1540 static int geneve_newlink(struct net *net, struct net_device *dev,
1541 struct nlattr *tb[], struct nlattr *data[],
1542 struct netlink_ext_ack *extack)
1543 {
1544 enum ifla_geneve_df df = GENEVE_DF_UNSET;
1545 bool use_udp6_rx_checksums = false;
1546 struct ip_tunnel_info info;
1547 bool ttl_inherit = false;
1548 bool metadata = false;
1549 int err;
1550
1551 init_tnl_info(&info, GENEVE_UDP_PORT);
1552 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1553 &use_udp6_rx_checksums, &ttl_inherit, &df, false);
1554 if (err)
1555 return err;
1556
1557 err = geneve_configure(net, dev, extack, &info, metadata,
1558 use_udp6_rx_checksums, ttl_inherit, df);
1559 if (err)
1560 return err;
1561
1562 geneve_link_config(dev, &info, tb);
1563
1564 return 0;
1565 }
1566
1567 /* Quiesces the geneve device data path for both TX and RX.
1568 *
1569 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1570 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1571 * to complete for the existing set of in-flight packets to be transmitted,
1572 * then we would have quiesced the transmit data path. All the future packets
1573 * will get dropped until we unquiesce the data path.
1574 *
1575 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1576 * if we set that to NULL under RCU and wait for synchronize_net() to
1577 * complete, then we would have quiesced the receive data path.
1578 */
1579 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1580 struct geneve_sock **gs6)
1581 {
1582 *gs4 = rtnl_dereference(geneve->sock4);
1583 rcu_assign_pointer(geneve->sock4, NULL);
1584 if (*gs4)
1585 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1586 #if IS_ENABLED(CONFIG_IPV6)
1587 *gs6 = rtnl_dereference(geneve->sock6);
1588 rcu_assign_pointer(geneve->sock6, NULL);
1589 if (*gs6)
1590 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1591 #else
1592 *gs6 = NULL;
1593 #endif
1594 synchronize_net();
1595 }
1596
1597 /* Resumes the geneve device data path for both TX and RX. */
1598 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1599 struct geneve_sock __maybe_unused *gs6)
1600 {
1601 rcu_assign_pointer(geneve->sock4, gs4);
1602 if (gs4)
1603 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1604 #if IS_ENABLED(CONFIG_IPV6)
1605 rcu_assign_pointer(geneve->sock6, gs6);
1606 if (gs6)
1607 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1608 #endif
1609 synchronize_net();
1610 }
1611
1612 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1613 struct nlattr *data[],
1614 struct netlink_ext_ack *extack)
1615 {
1616 struct geneve_dev *geneve = netdev_priv(dev);
1617 struct geneve_sock *gs4, *gs6;
1618 struct ip_tunnel_info info;
1619 bool metadata;
1620 bool use_udp6_rx_checksums;
1621 enum ifla_geneve_df df;
1622 bool ttl_inherit;
1623 int err;
1624
1625 /* If the geneve device is configured for metadata (or externally
1626 * controlled, for example, OVS), then nothing can be changed.
1627 */
1628 if (geneve->collect_md)
1629 return -EOPNOTSUPP;
1630
1631 /* Start with the existing info. */
1632 memcpy(&info, &geneve->info, sizeof(info));
1633 metadata = geneve->collect_md;
1634 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1635 ttl_inherit = geneve->ttl_inherit;
1636 err = geneve_nl2info(tb, data, extack, &info, &metadata,
1637 &use_udp6_rx_checksums, &ttl_inherit, &df, true);
1638 if (err)
1639 return err;
1640
1641 if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1642 dst_cache_reset(&info.dst_cache);
1643 geneve_link_config(dev, &info, tb);
1644 }
1645
1646 geneve_quiesce(geneve, &gs4, &gs6);
1647 geneve->info = info;
1648 geneve->collect_md = metadata;
1649 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1650 geneve->ttl_inherit = ttl_inherit;
1651 geneve_unquiesce(geneve, gs4, gs6);
1652
1653 return 0;
1654 }
1655
1656 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1657 {
1658 struct geneve_dev *geneve = netdev_priv(dev);
1659
1660 list_del(&geneve->next);
1661 unregister_netdevice_queue(dev, head);
1662 }
1663
1664 static size_t geneve_get_size(const struct net_device *dev)
1665 {
1666 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1667 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1668 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1669 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1670 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1671 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1672 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1673 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1674 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1675 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1676 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1677 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1678 0;
1679 }
1680
1681 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1682 {
1683 struct geneve_dev *geneve = netdev_priv(dev);
1684 struct ip_tunnel_info *info = &geneve->info;
1685 bool ttl_inherit = geneve->ttl_inherit;
1686 bool metadata = geneve->collect_md;
1687 __u8 tmp_vni[3];
1688 __u32 vni;
1689
1690 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1691 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1692 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1693 goto nla_put_failure;
1694
1695 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1696 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1697 info->key.u.ipv4.dst))
1698 goto nla_put_failure;
1699 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1700 !!(info->key.tun_flags & TUNNEL_CSUM)))
1701 goto nla_put_failure;
1702
1703 #if IS_ENABLED(CONFIG_IPV6)
1704 } else if (!metadata) {
1705 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1706 &info->key.u.ipv6.dst))
1707 goto nla_put_failure;
1708 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1709 !(info->key.tun_flags & TUNNEL_CSUM)))
1710 goto nla_put_failure;
1711 #endif
1712 }
1713
1714 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1715 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1716 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1717 goto nla_put_failure;
1718
1719 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->df))
1720 goto nla_put_failure;
1721
1722 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1723 goto nla_put_failure;
1724
1725 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1726 goto nla_put_failure;
1727
1728 #if IS_ENABLED(CONFIG_IPV6)
1729 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1730 !geneve->use_udp6_rx_checksums))
1731 goto nla_put_failure;
1732 #endif
1733
1734 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1735 goto nla_put_failure;
1736
1737 return 0;
1738
1739 nla_put_failure:
1740 return -EMSGSIZE;
1741 }
1742
1743 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1744 .kind = "geneve",
1745 .maxtype = IFLA_GENEVE_MAX,
1746 .policy = geneve_policy,
1747 .priv_size = sizeof(struct geneve_dev),
1748 .setup = geneve_setup,
1749 .validate = geneve_validate,
1750 .newlink = geneve_newlink,
1751 .changelink = geneve_changelink,
1752 .dellink = geneve_dellink,
1753 .get_size = geneve_get_size,
1754 .fill_info = geneve_fill_info,
1755 };
1756
1757 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1758 u8 name_assign_type, u16 dst_port)
1759 {
1760 struct nlattr *tb[IFLA_MAX + 1];
1761 struct ip_tunnel_info info;
1762 struct net_device *dev;
1763 LIST_HEAD(list_kill);
1764 int err;
1765
1766 memset(tb, 0, sizeof(tb));
1767 dev = rtnl_create_link(net, name, name_assign_type,
1768 &geneve_link_ops, tb, NULL);
1769 if (IS_ERR(dev))
1770 return dev;
1771
1772 init_tnl_info(&info, dst_port);
1773 err = geneve_configure(net, dev, NULL, &info,
1774 true, true, false, GENEVE_DF_UNSET);
1775 if (err) {
1776 free_netdev(dev);
1777 return ERR_PTR(err);
1778 }
1779
1780 /* openvswitch users expect packet sizes to be unrestricted,
1781 * so set the largest MTU we can.
1782 */
1783 err = geneve_change_mtu(dev, IP_MAX_MTU);
1784 if (err)
1785 goto err;
1786
1787 err = rtnl_configure_link(dev, NULL);
1788 if (err < 0)
1789 goto err;
1790
1791 return dev;
1792 err:
1793 geneve_dellink(dev, &list_kill);
1794 unregister_netdevice_many(&list_kill);
1795 return ERR_PTR(err);
1796 }
1797 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1798
1799 static int geneve_netdevice_event(struct notifier_block *unused,
1800 unsigned long event, void *ptr)
1801 {
1802 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1803
1804 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1805 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1806 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1807 } else if (event == NETDEV_UNREGISTER) {
1808 geneve_offload_rx_ports(dev, false);
1809 } else if (event == NETDEV_REGISTER) {
1810 geneve_offload_rx_ports(dev, true);
1811 }
1812
1813 return NOTIFY_DONE;
1814 }
1815
1816 static struct notifier_block geneve_notifier_block __read_mostly = {
1817 .notifier_call = geneve_netdevice_event,
1818 };
1819
1820 static __net_init int geneve_init_net(struct net *net)
1821 {
1822 struct geneve_net *gn = net_generic(net, geneve_net_id);
1823
1824 INIT_LIST_HEAD(&gn->geneve_list);
1825 INIT_LIST_HEAD(&gn->sock_list);
1826 return 0;
1827 }
1828
1829 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1830 {
1831 struct geneve_net *gn = net_generic(net, geneve_net_id);
1832 struct geneve_dev *geneve, *next;
1833 struct net_device *dev, *aux;
1834
1835 /* gather any geneve devices that were moved into this ns */
1836 for_each_netdev_safe(net, dev, aux)
1837 if (dev->rtnl_link_ops == &geneve_link_ops)
1838 unregister_netdevice_queue(dev, head);
1839
1840 /* now gather any other geneve devices that were created in this ns */
1841 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1842 /* If geneve->dev is in the same netns, it was already added
1843 * to the list by the previous loop.
1844 */
1845 if (!net_eq(dev_net(geneve->dev), net))
1846 unregister_netdevice_queue(geneve->dev, head);
1847 }
1848 }
1849
1850 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1851 {
1852 struct net *net;
1853 LIST_HEAD(list);
1854
1855 rtnl_lock();
1856 list_for_each_entry(net, net_list, exit_list)
1857 geneve_destroy_tunnels(net, &list);
1858
1859 /* unregister the devices gathered above */
1860 unregister_netdevice_many(&list);
1861 rtnl_unlock();
1862
1863 list_for_each_entry(net, net_list, exit_list) {
1864 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1865
1866 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1867 }
1868 }
1869
1870 static struct pernet_operations geneve_net_ops = {
1871 .init = geneve_init_net,
1872 .exit_batch = geneve_exit_batch_net,
1873 .id = &geneve_net_id,
1874 .size = sizeof(struct geneve_net),
1875 };
1876
1877 static int __init geneve_init_module(void)
1878 {
1879 int rc;
1880
1881 rc = register_pernet_subsys(&geneve_net_ops);
1882 if (rc)
1883 goto out1;
1884
1885 rc = register_netdevice_notifier(&geneve_notifier_block);
1886 if (rc)
1887 goto out2;
1888
1889 rc = rtnl_link_register(&geneve_link_ops);
1890 if (rc)
1891 goto out3;
1892
1893 return 0;
1894 out3:
1895 unregister_netdevice_notifier(&geneve_notifier_block);
1896 out2:
1897 unregister_pernet_subsys(&geneve_net_ops);
1898 out1:
1899 return rc;
1900 }
1901 late_initcall(geneve_init_module);
1902
1903 static void __exit geneve_cleanup_module(void)
1904 {
1905 rtnl_link_unregister(&geneve_link_ops);
1906 unregister_netdevice_notifier(&geneve_notifier_block);
1907 unregister_pernet_subsys(&geneve_net_ops);
1908 }
1909 module_exit(geneve_cleanup_module);
1910
1911 MODULE_LICENSE("GPL");
1912 MODULE_VERSION(GENEVE_NETDEV_VER);
1913 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1914 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1915 MODULE_ALIAS_RTNL_LINK("geneve");
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