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cxgb4: Fix race between loopback and normal Tx path
[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 struct geneve_config {
52 struct ip_tunnel_info info;
53 bool collect_md;
54 bool use_udp6_rx_checksums;
55 bool ttl_inherit;
56 enum ifla_geneve_df df;
57 };
58
59 /* Pseudo network device */
60 struct geneve_dev {
61 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
62 #if IS_ENABLED(CONFIG_IPV6)
63 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
64 #endif
65 struct net *net; /* netns for packet i/o */
66 struct net_device *dev; /* netdev for geneve tunnel */
67 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
68 #if IS_ENABLED(CONFIG_IPV6)
69 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
70 #endif
71 struct list_head next; /* geneve's per namespace list */
72 struct gro_cells gro_cells;
73 struct geneve_config cfg;
74 };
75
76 struct geneve_sock {
77 bool collect_md;
78 struct list_head list;
79 struct socket *sock;
80 struct rcu_head rcu;
81 int refcnt;
82 struct hlist_head vni_list[VNI_HASH_SIZE];
83 };
84
85 static inline __u32 geneve_net_vni_hash(u8 vni[3])
86 {
87 __u32 vnid;
88
89 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
90 return hash_32(vnid, VNI_HASH_BITS);
91 }
92
93 static __be64 vni_to_tunnel_id(const __u8 *vni)
94 {
95 #ifdef __BIG_ENDIAN
96 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
97 #else
98 return (__force __be64)(((__force u64)vni[0] << 40) |
99 ((__force u64)vni[1] << 48) |
100 ((__force u64)vni[2] << 56));
101 #endif
102 }
103
104 /* Convert 64 bit tunnel ID to 24 bit VNI. */
105 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
106 {
107 #ifdef __BIG_ENDIAN
108 vni[0] = (__force __u8)(tun_id >> 16);
109 vni[1] = (__force __u8)(tun_id >> 8);
110 vni[2] = (__force __u8)tun_id;
111 #else
112 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
113 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
114 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
115 #endif
116 }
117
118 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
119 {
120 return !memcmp(vni, &tun_id[5], 3);
121 }
122
123 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
124 {
125 return gs->sock->sk->sk_family;
126 }
127
128 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
129 __be32 addr, u8 vni[])
130 {
131 struct hlist_head *vni_list_head;
132 struct geneve_dev_node *node;
133 __u32 hash;
134
135 /* Find the device for this VNI */
136 hash = geneve_net_vni_hash(vni);
137 vni_list_head = &gs->vni_list[hash];
138 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
139 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
140 addr == node->geneve->cfg.info.key.u.ipv4.dst)
141 return node->geneve;
142 }
143 return NULL;
144 }
145
146 #if IS_ENABLED(CONFIG_IPV6)
147 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
148 struct in6_addr addr6, u8 vni[])
149 {
150 struct hlist_head *vni_list_head;
151 struct geneve_dev_node *node;
152 __u32 hash;
153
154 /* Find the device for this VNI */
155 hash = geneve_net_vni_hash(vni);
156 vni_list_head = &gs->vni_list[hash];
157 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
158 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
159 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
160 return node->geneve;
161 }
162 return NULL;
163 }
164 #endif
165
166 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
167 {
168 return (struct genevehdr *)(udp_hdr(skb) + 1);
169 }
170
171 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
172 struct sk_buff *skb)
173 {
174 static u8 zero_vni[3];
175 u8 *vni;
176
177 if (geneve_get_sk_family(gs) == AF_INET) {
178 struct iphdr *iph;
179 __be32 addr;
180
181 iph = ip_hdr(skb); /* outer IP header... */
182
183 if (gs->collect_md) {
184 vni = zero_vni;
185 addr = 0;
186 } else {
187 vni = geneve_hdr(skb)->vni;
188 addr = iph->saddr;
189 }
190
191 return geneve_lookup(gs, addr, vni);
192 #if IS_ENABLED(CONFIG_IPV6)
193 } else if (geneve_get_sk_family(gs) == AF_INET6) {
194 static struct in6_addr zero_addr6;
195 struct ipv6hdr *ip6h;
196 struct in6_addr addr6;
197
198 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
199
200 if (gs->collect_md) {
201 vni = zero_vni;
202 addr6 = zero_addr6;
203 } else {
204 vni = geneve_hdr(skb)->vni;
205 addr6 = ip6h->saddr;
206 }
207
208 return geneve6_lookup(gs, addr6, vni);
209 #endif
210 }
211 return NULL;
212 }
213
214 /* geneve receive/decap routine */
215 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
216 struct sk_buff *skb)
217 {
218 struct genevehdr *gnvh = geneve_hdr(skb);
219 struct metadata_dst *tun_dst = NULL;
220 struct pcpu_sw_netstats *stats;
221 unsigned int len;
222 int err = 0;
223 void *oiph;
224
225 if (ip_tunnel_collect_metadata() || gs->collect_md) {
226 __be16 flags;
227
228 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
229 (gnvh->oam ? TUNNEL_OAM : 0) |
230 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
231
232 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
233 vni_to_tunnel_id(gnvh->vni),
234 gnvh->opt_len * 4);
235 if (!tun_dst) {
236 geneve->dev->stats.rx_dropped++;
237 goto drop;
238 }
239 /* Update tunnel dst according to Geneve options. */
240 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
241 gnvh->options, gnvh->opt_len * 4,
242 TUNNEL_GENEVE_OPT);
243 } else {
244 /* Drop packets w/ critical options,
245 * since we don't support any...
246 */
247 if (gnvh->critical) {
248 geneve->dev->stats.rx_frame_errors++;
249 geneve->dev->stats.rx_errors++;
250 goto drop;
251 }
252 }
253
254 skb_reset_mac_header(skb);
255 skb->protocol = eth_type_trans(skb, geneve->dev);
256 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
257
258 if (tun_dst)
259 skb_dst_set(skb, &tun_dst->dst);
260
261 /* Ignore packet loops (and multicast echo) */
262 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
263 geneve->dev->stats.rx_errors++;
264 goto drop;
265 }
266
267 oiph = skb_network_header(skb);
268 skb_reset_network_header(skb);
269
270 if (geneve_get_sk_family(gs) == AF_INET)
271 err = IP_ECN_decapsulate(oiph, skb);
272 #if IS_ENABLED(CONFIG_IPV6)
273 else
274 err = IP6_ECN_decapsulate(oiph, skb);
275 #endif
276
277 if (unlikely(err)) {
278 if (log_ecn_error) {
279 if (geneve_get_sk_family(gs) == AF_INET)
280 net_info_ratelimited("non-ECT from %pI4 "
281 "with TOS=%#x\n",
282 &((struct iphdr *)oiph)->saddr,
283 ((struct iphdr *)oiph)->tos);
284 #if IS_ENABLED(CONFIG_IPV6)
285 else
286 net_info_ratelimited("non-ECT from %pI6\n",
287 &((struct ipv6hdr *)oiph)->saddr);
288 #endif
289 }
290 if (err > 1) {
291 ++geneve->dev->stats.rx_frame_errors;
292 ++geneve->dev->stats.rx_errors;
293 goto drop;
294 }
295 }
296
297 len = skb->len;
298 err = gro_cells_receive(&geneve->gro_cells, skb);
299 if (likely(err == NET_RX_SUCCESS)) {
300 stats = this_cpu_ptr(geneve->dev->tstats);
301 u64_stats_update_begin(&stats->syncp);
302 stats->rx_packets++;
303 stats->rx_bytes += len;
304 u64_stats_update_end(&stats->syncp);
305 }
306 return;
307 drop:
308 /* Consume bad packet */
309 kfree_skb(skb);
310 }
311
312 /* Setup stats when device is created */
313 static int geneve_init(struct net_device *dev)
314 {
315 struct geneve_dev *geneve = netdev_priv(dev);
316 int err;
317
318 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
319 if (!dev->tstats)
320 return -ENOMEM;
321
322 err = gro_cells_init(&geneve->gro_cells, dev);
323 if (err) {
324 free_percpu(dev->tstats);
325 return err;
326 }
327
328 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
329 if (err) {
330 free_percpu(dev->tstats);
331 gro_cells_destroy(&geneve->gro_cells);
332 return err;
333 }
334 return 0;
335 }
336
337 static void geneve_uninit(struct net_device *dev)
338 {
339 struct geneve_dev *geneve = netdev_priv(dev);
340
341 dst_cache_destroy(&geneve->cfg.info.dst_cache);
342 gro_cells_destroy(&geneve->gro_cells);
343 free_percpu(dev->tstats);
344 }
345
346 /* Callback from net/ipv4/udp.c to receive packets */
347 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
348 {
349 struct genevehdr *geneveh;
350 struct geneve_dev *geneve;
351 struct geneve_sock *gs;
352 int opts_len;
353
354 /* Need UDP and Geneve header to be present */
355 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
356 goto drop;
357
358 /* Return packets with reserved bits set */
359 geneveh = geneve_hdr(skb);
360 if (unlikely(geneveh->ver != GENEVE_VER))
361 goto drop;
362
363 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
364 goto drop;
365
366 gs = rcu_dereference_sk_user_data(sk);
367 if (!gs)
368 goto drop;
369
370 geneve = geneve_lookup_skb(gs, skb);
371 if (!geneve)
372 goto drop;
373
374 opts_len = geneveh->opt_len * 4;
375 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
376 htons(ETH_P_TEB),
377 !net_eq(geneve->net, dev_net(geneve->dev)))) {
378 geneve->dev->stats.rx_dropped++;
379 goto drop;
380 }
381
382 geneve_rx(geneve, gs, skb);
383 return 0;
384
385 drop:
386 /* Consume bad packet */
387 kfree_skb(skb);
388 return 0;
389 }
390
391 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
392 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
393 {
394 struct genevehdr *geneveh;
395 struct geneve_sock *gs;
396 u8 zero_vni[3] = { 0 };
397 u8 *vni = zero_vni;
398
399 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
400 return -EINVAL;
401
402 geneveh = geneve_hdr(skb);
403 if (geneveh->ver != GENEVE_VER)
404 return -EINVAL;
405
406 if (geneveh->proto_type != htons(ETH_P_TEB))
407 return -EINVAL;
408
409 gs = rcu_dereference_sk_user_data(sk);
410 if (!gs)
411 return -ENOENT;
412
413 if (geneve_get_sk_family(gs) == AF_INET) {
414 struct iphdr *iph = ip_hdr(skb);
415 __be32 addr4 = 0;
416
417 if (!gs->collect_md) {
418 vni = geneve_hdr(skb)->vni;
419 addr4 = iph->daddr;
420 }
421
422 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
423 }
424
425 #if IS_ENABLED(CONFIG_IPV6)
426 if (geneve_get_sk_family(gs) == AF_INET6) {
427 struct ipv6hdr *ip6h = ipv6_hdr(skb);
428 struct in6_addr addr6;
429
430 memset(&addr6, 0, sizeof(struct in6_addr));
431
432 if (!gs->collect_md) {
433 vni = geneve_hdr(skb)->vni;
434 addr6 = ip6h->daddr;
435 }
436
437 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
438 }
439 #endif
440
441 return -EPFNOSUPPORT;
442 }
443
444 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
445 __be16 port, bool ipv6_rx_csum)
446 {
447 struct socket *sock;
448 struct udp_port_cfg udp_conf;
449 int err;
450
451 memset(&udp_conf, 0, sizeof(udp_conf));
452
453 if (ipv6) {
454 udp_conf.family = AF_INET6;
455 udp_conf.ipv6_v6only = 1;
456 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
457 } else {
458 udp_conf.family = AF_INET;
459 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
460 }
461
462 udp_conf.local_udp_port = port;
463
464 /* Open UDP socket */
465 err = udp_sock_create(net, &udp_conf, &sock);
466 if (err < 0)
467 return ERR_PTR(err);
468
469 return sock;
470 }
471
472 static int geneve_hlen(struct genevehdr *gh)
473 {
474 return sizeof(*gh) + gh->opt_len * 4;
475 }
476
477 static struct sk_buff *geneve_gro_receive(struct sock *sk,
478 struct list_head *head,
479 struct sk_buff *skb)
480 {
481 struct sk_buff *pp = NULL;
482 struct sk_buff *p;
483 struct genevehdr *gh, *gh2;
484 unsigned int hlen, gh_len, off_gnv;
485 const struct packet_offload *ptype;
486 __be16 type;
487 int flush = 1;
488
489 off_gnv = skb_gro_offset(skb);
490 hlen = off_gnv + sizeof(*gh);
491 gh = skb_gro_header_fast(skb, off_gnv);
492 if (skb_gro_header_hard(skb, hlen)) {
493 gh = skb_gro_header_slow(skb, hlen, off_gnv);
494 if (unlikely(!gh))
495 goto out;
496 }
497
498 if (gh->ver != GENEVE_VER || gh->oam)
499 goto out;
500 gh_len = geneve_hlen(gh);
501
502 hlen = off_gnv + gh_len;
503 if (skb_gro_header_hard(skb, hlen)) {
504 gh = skb_gro_header_slow(skb, hlen, off_gnv);
505 if (unlikely(!gh))
506 goto out;
507 }
508
509 list_for_each_entry(p, head, list) {
510 if (!NAPI_GRO_CB(p)->same_flow)
511 continue;
512
513 gh2 = (struct genevehdr *)(p->data + off_gnv);
514 if (gh->opt_len != gh2->opt_len ||
515 memcmp(gh, gh2, gh_len)) {
516 NAPI_GRO_CB(p)->same_flow = 0;
517 continue;
518 }
519 }
520
521 type = gh->proto_type;
522
523 rcu_read_lock();
524 ptype = gro_find_receive_by_type(type);
525 if (!ptype)
526 goto out_unlock;
527
528 skb_gro_pull(skb, gh_len);
529 skb_gro_postpull_rcsum(skb, gh, gh_len);
530 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
531 flush = 0;
532
533 out_unlock:
534 rcu_read_unlock();
535 out:
536 skb_gro_flush_final(skb, pp, flush);
537
538 return pp;
539 }
540
541 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
542 int nhoff)
543 {
544 struct genevehdr *gh;
545 struct packet_offload *ptype;
546 __be16 type;
547 int gh_len;
548 int err = -ENOSYS;
549
550 gh = (struct genevehdr *)(skb->data + nhoff);
551 gh_len = geneve_hlen(gh);
552 type = gh->proto_type;
553
554 rcu_read_lock();
555 ptype = gro_find_complete_by_type(type);
556 if (ptype)
557 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
558
559 rcu_read_unlock();
560
561 skb_set_inner_mac_header(skb, nhoff + gh_len);
562
563 return err;
564 }
565
566 /* Create new listen socket if needed */
567 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
568 bool ipv6, bool ipv6_rx_csum)
569 {
570 struct geneve_net *gn = net_generic(net, geneve_net_id);
571 struct geneve_sock *gs;
572 struct socket *sock;
573 struct udp_tunnel_sock_cfg tunnel_cfg;
574 int h;
575
576 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
577 if (!gs)
578 return ERR_PTR(-ENOMEM);
579
580 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
581 if (IS_ERR(sock)) {
582 kfree(gs);
583 return ERR_CAST(sock);
584 }
585
586 gs->sock = sock;
587 gs->refcnt = 1;
588 for (h = 0; h < VNI_HASH_SIZE; ++h)
589 INIT_HLIST_HEAD(&gs->vni_list[h]);
590
591 /* Initialize the geneve udp offloads structure */
592 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
593
594 /* Mark socket as an encapsulation socket */
595 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
596 tunnel_cfg.sk_user_data = gs;
597 tunnel_cfg.encap_type = 1;
598 tunnel_cfg.gro_receive = geneve_gro_receive;
599 tunnel_cfg.gro_complete = geneve_gro_complete;
600 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
601 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
602 tunnel_cfg.encap_destroy = NULL;
603 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
604 list_add(&gs->list, &gn->sock_list);
605 return gs;
606 }
607
608 static void __geneve_sock_release(struct geneve_sock *gs)
609 {
610 if (!gs || --gs->refcnt)
611 return;
612
613 list_del(&gs->list);
614 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
615 udp_tunnel_sock_release(gs->sock);
616 kfree_rcu(gs, rcu);
617 }
618
619 static void geneve_sock_release(struct geneve_dev *geneve)
620 {
621 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
622 #if IS_ENABLED(CONFIG_IPV6)
623 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
624
625 rcu_assign_pointer(geneve->sock6, NULL);
626 #endif
627
628 rcu_assign_pointer(geneve->sock4, NULL);
629 synchronize_net();
630
631 __geneve_sock_release(gs4);
632 #if IS_ENABLED(CONFIG_IPV6)
633 __geneve_sock_release(gs6);
634 #endif
635 }
636
637 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
638 sa_family_t family,
639 __be16 dst_port)
640 {
641 struct geneve_sock *gs;
642
643 list_for_each_entry(gs, &gn->sock_list, list) {
644 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
645 geneve_get_sk_family(gs) == family) {
646 return gs;
647 }
648 }
649 return NULL;
650 }
651
652 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
653 {
654 struct net *net = geneve->net;
655 struct geneve_net *gn = net_generic(net, geneve_net_id);
656 struct geneve_dev_node *node;
657 struct geneve_sock *gs;
658 __u8 vni[3];
659 __u32 hash;
660
661 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
662 if (gs) {
663 gs->refcnt++;
664 goto out;
665 }
666
667 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
668 geneve->cfg.use_udp6_rx_checksums);
669 if (IS_ERR(gs))
670 return PTR_ERR(gs);
671
672 out:
673 gs->collect_md = geneve->cfg.collect_md;
674 #if IS_ENABLED(CONFIG_IPV6)
675 if (ipv6) {
676 rcu_assign_pointer(geneve->sock6, gs);
677 node = &geneve->hlist6;
678 } else
679 #endif
680 {
681 rcu_assign_pointer(geneve->sock4, gs);
682 node = &geneve->hlist4;
683 }
684 node->geneve = geneve;
685
686 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
687 hash = geneve_net_vni_hash(vni);
688 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
689 return 0;
690 }
691
692 static int geneve_open(struct net_device *dev)
693 {
694 struct geneve_dev *geneve = netdev_priv(dev);
695 bool metadata = geneve->cfg.collect_md;
696 bool ipv4, ipv6;
697 int ret = 0;
698
699 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
700 ipv4 = !ipv6 || metadata;
701 #if IS_ENABLED(CONFIG_IPV6)
702 if (ipv6) {
703 ret = geneve_sock_add(geneve, true);
704 if (ret < 0 && ret != -EAFNOSUPPORT)
705 ipv4 = false;
706 }
707 #endif
708 if (ipv4)
709 ret = geneve_sock_add(geneve, false);
710 if (ret < 0)
711 geneve_sock_release(geneve);
712
713 return ret;
714 }
715
716 static int geneve_stop(struct net_device *dev)
717 {
718 struct geneve_dev *geneve = netdev_priv(dev);
719
720 hlist_del_init_rcu(&geneve->hlist4.hlist);
721 #if IS_ENABLED(CONFIG_IPV6)
722 hlist_del_init_rcu(&geneve->hlist6.hlist);
723 #endif
724 geneve_sock_release(geneve);
725 return 0;
726 }
727
728 static void geneve_build_header(struct genevehdr *geneveh,
729 const struct ip_tunnel_info *info)
730 {
731 geneveh->ver = GENEVE_VER;
732 geneveh->opt_len = info->options_len / 4;
733 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
734 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
735 geneveh->rsvd1 = 0;
736 tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
737 geneveh->proto_type = htons(ETH_P_TEB);
738 geneveh->rsvd2 = 0;
739
740 if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
741 ip_tunnel_info_opts_get(geneveh->options, info);
742 }
743
744 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
745 const struct ip_tunnel_info *info,
746 bool xnet, int ip_hdr_len)
747 {
748 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
749 struct genevehdr *gnvh;
750 int min_headroom;
751 int err;
752
753 skb_reset_mac_header(skb);
754 skb_scrub_packet(skb, xnet);
755
756 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
757 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
758 err = skb_cow_head(skb, min_headroom);
759 if (unlikely(err))
760 goto free_dst;
761
762 err = udp_tunnel_handle_offloads(skb, udp_sum);
763 if (err)
764 goto free_dst;
765
766 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
767 geneve_build_header(gnvh, info);
768 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
769 return 0;
770
771 free_dst:
772 dst_release(dst);
773 return err;
774 }
775
776 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
777 struct net_device *dev,
778 struct geneve_sock *gs4,
779 struct flowi4 *fl4,
780 const struct ip_tunnel_info *info)
781 {
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->cfg.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->cfg.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 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
861 NULL);
862 if (IS_ERR(dst)) {
863 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
864 return ERR_PTR(-ENETUNREACH);
865 }
866 if (dst->dev == dev) { /* is this necessary? */
867 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
868 dst_release(dst);
869 return ERR_PTR(-ELOOP);
870 }
871
872 if (use_cache)
873 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
874 return dst;
875 }
876 #endif
877
878 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
879 struct geneve_dev *geneve,
880 const struct ip_tunnel_info *info)
881 {
882 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
883 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
884 const struct ip_tunnel_key *key = &info->key;
885 struct rtable *rt;
886 struct flowi4 fl4;
887 __u8 tos, ttl;
888 __be16 df = 0;
889 __be16 sport;
890 int err;
891
892 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
893 if (IS_ERR(rt))
894 return PTR_ERR(rt);
895
896 err = skb_tunnel_check_pmtu(skb, &rt->dst,
897 GENEVE_IPV4_HLEN + info->options_len,
898 netif_is_any_bridge_port(dev));
899 if (err < 0) {
900 dst_release(&rt->dst);
901 return err;
902 } else if (err) {
903 struct ip_tunnel_info *info;
904
905 info = skb_tunnel_info(skb);
906 if (info) {
907 info->key.u.ipv4.dst = fl4.saddr;
908 info->key.u.ipv4.src = fl4.daddr;
909 }
910
911 if (!pskb_may_pull(skb, ETH_HLEN)) {
912 dst_release(&rt->dst);
913 return -EINVAL;
914 }
915
916 skb->protocol = eth_type_trans(skb, geneve->dev);
917 netif_rx(skb);
918 dst_release(&rt->dst);
919 return -EMSGSIZE;
920 }
921
922 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
923 if (geneve->cfg.collect_md) {
924 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
925 ttl = key->ttl;
926
927 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
928 } else {
929 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
930 if (geneve->cfg.ttl_inherit)
931 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
932 else
933 ttl = key->ttl;
934 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
935
936 if (geneve->cfg.df == GENEVE_DF_SET) {
937 df = htons(IP_DF);
938 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
939 struct ethhdr *eth = eth_hdr(skb);
940
941 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
942 df = htons(IP_DF);
943 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
944 struct iphdr *iph = ip_hdr(skb);
945
946 if (iph->frag_off & htons(IP_DF))
947 df = htons(IP_DF);
948 }
949 }
950 }
951
952 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
953 if (unlikely(err))
954 return err;
955
956 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
957 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
958 !net_eq(geneve->net, dev_net(geneve->dev)),
959 !(info->key.tun_flags & TUNNEL_CSUM));
960 return 0;
961 }
962
963 #if IS_ENABLED(CONFIG_IPV6)
964 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
965 struct geneve_dev *geneve,
966 const struct ip_tunnel_info *info)
967 {
968 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
969 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
970 const struct ip_tunnel_key *key = &info->key;
971 struct dst_entry *dst = NULL;
972 struct flowi6 fl6;
973 __u8 prio, ttl;
974 __be16 sport;
975 int err;
976
977 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
978 if (IS_ERR(dst))
979 return PTR_ERR(dst);
980
981 err = skb_tunnel_check_pmtu(skb, dst,
982 GENEVE_IPV6_HLEN + info->options_len,
983 netif_is_any_bridge_port(dev));
984 if (err < 0) {
985 dst_release(dst);
986 return err;
987 } else if (err) {
988 struct ip_tunnel_info *info = skb_tunnel_info(skb);
989
990 if (info) {
991 info->key.u.ipv6.dst = fl6.saddr;
992 info->key.u.ipv6.src = fl6.daddr;
993 }
994
995 if (!pskb_may_pull(skb, ETH_HLEN)) {
996 dst_release(dst);
997 return -EINVAL;
998 }
999
1000 skb->protocol = eth_type_trans(skb, geneve->dev);
1001 netif_rx(skb);
1002 dst_release(dst);
1003 return -EMSGSIZE;
1004 }
1005
1006 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1007 if (geneve->cfg.collect_md) {
1008 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1009 ttl = key->ttl;
1010 } else {
1011 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1012 ip_hdr(skb), skb);
1013 if (geneve->cfg.ttl_inherit)
1014 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1015 else
1016 ttl = key->ttl;
1017 ttl = ttl ? : ip6_dst_hoplimit(dst);
1018 }
1019 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1020 if (unlikely(err))
1021 return err;
1022
1023 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1024 &fl6.saddr, &fl6.daddr, prio, ttl,
1025 info->key.label, sport, geneve->cfg.info.key.tp_dst,
1026 !(info->key.tun_flags & TUNNEL_CSUM));
1027 return 0;
1028 }
1029 #endif
1030
1031 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1032 {
1033 struct geneve_dev *geneve = netdev_priv(dev);
1034 struct ip_tunnel_info *info = NULL;
1035 int err;
1036
1037 if (geneve->cfg.collect_md) {
1038 info = skb_tunnel_info(skb);
1039 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1040 netdev_dbg(dev, "no tunnel metadata\n");
1041 dev_kfree_skb(skb);
1042 dev->stats.tx_dropped++;
1043 return NETDEV_TX_OK;
1044 }
1045 } else {
1046 info = &geneve->cfg.info;
1047 }
1048
1049 rcu_read_lock();
1050 #if IS_ENABLED(CONFIG_IPV6)
1051 if (info->mode & IP_TUNNEL_INFO_IPV6)
1052 err = geneve6_xmit_skb(skb, dev, geneve, info);
1053 else
1054 #endif
1055 err = geneve_xmit_skb(skb, dev, geneve, info);
1056 rcu_read_unlock();
1057
1058 if (likely(!err))
1059 return NETDEV_TX_OK;
1060
1061 if (err != -EMSGSIZE)
1062 dev_kfree_skb(skb);
1063
1064 if (err == -ELOOP)
1065 dev->stats.collisions++;
1066 else if (err == -ENETUNREACH)
1067 dev->stats.tx_carrier_errors++;
1068
1069 dev->stats.tx_errors++;
1070 return NETDEV_TX_OK;
1071 }
1072
1073 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1074 {
1075 if (new_mtu > dev->max_mtu)
1076 new_mtu = dev->max_mtu;
1077 else if (new_mtu < dev->min_mtu)
1078 new_mtu = dev->min_mtu;
1079
1080 dev->mtu = new_mtu;
1081 return 0;
1082 }
1083
1084 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1085 {
1086 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1087 struct geneve_dev *geneve = netdev_priv(dev);
1088
1089 if (ip_tunnel_info_af(info) == AF_INET) {
1090 struct rtable *rt;
1091 struct flowi4 fl4;
1092 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1093
1094 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
1095 if (IS_ERR(rt))
1096 return PTR_ERR(rt);
1097
1098 ip_rt_put(rt);
1099 info->key.u.ipv4.src = fl4.saddr;
1100 #if IS_ENABLED(CONFIG_IPV6)
1101 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1102 struct dst_entry *dst;
1103 struct flowi6 fl6;
1104 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1105
1106 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
1107 if (IS_ERR(dst))
1108 return PTR_ERR(dst);
1109
1110 dst_release(dst);
1111 info->key.u.ipv6.src = fl6.saddr;
1112 #endif
1113 } else {
1114 return -EINVAL;
1115 }
1116
1117 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1118 1, USHRT_MAX, true);
1119 info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1120 return 0;
1121 }
1122
1123 static const struct net_device_ops geneve_netdev_ops = {
1124 .ndo_init = geneve_init,
1125 .ndo_uninit = geneve_uninit,
1126 .ndo_open = geneve_open,
1127 .ndo_stop = geneve_stop,
1128 .ndo_start_xmit = geneve_xmit,
1129 .ndo_get_stats64 = ip_tunnel_get_stats64,
1130 .ndo_change_mtu = geneve_change_mtu,
1131 .ndo_validate_addr = eth_validate_addr,
1132 .ndo_set_mac_address = eth_mac_addr,
1133 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1134 };
1135
1136 static void geneve_get_drvinfo(struct net_device *dev,
1137 struct ethtool_drvinfo *drvinfo)
1138 {
1139 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1140 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1141 }
1142
1143 static const struct ethtool_ops geneve_ethtool_ops = {
1144 .get_drvinfo = geneve_get_drvinfo,
1145 .get_link = ethtool_op_get_link,
1146 };
1147
1148 /* Info for udev, that this is a virtual tunnel endpoint */
1149 static struct device_type geneve_type = {
1150 .name = "geneve",
1151 };
1152
1153 /* Calls the ndo_udp_tunnel_add of the caller in order to
1154 * supply the listening GENEVE udp ports. Callers are expected
1155 * to implement the ndo_udp_tunnel_add.
1156 */
1157 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1158 {
1159 struct net *net = dev_net(dev);
1160 struct geneve_net *gn = net_generic(net, geneve_net_id);
1161 struct geneve_sock *gs;
1162
1163 rcu_read_lock();
1164 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1165 if (push) {
1166 udp_tunnel_push_rx_port(dev, gs->sock,
1167 UDP_TUNNEL_TYPE_GENEVE);
1168 } else {
1169 udp_tunnel_drop_rx_port(dev, gs->sock,
1170 UDP_TUNNEL_TYPE_GENEVE);
1171 }
1172 }
1173 rcu_read_unlock();
1174 }
1175
1176 /* Initialize the device structure. */
1177 static void geneve_setup(struct net_device *dev)
1178 {
1179 ether_setup(dev);
1180
1181 dev->netdev_ops = &geneve_netdev_ops;
1182 dev->ethtool_ops = &geneve_ethtool_ops;
1183 dev->needs_free_netdev = true;
1184
1185 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1186
1187 dev->features |= NETIF_F_LLTX;
1188 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1189 dev->features |= NETIF_F_RXCSUM;
1190 dev->features |= NETIF_F_GSO_SOFTWARE;
1191
1192 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1193 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1194
1195 /* MTU range: 68 - (something less than 65535) */
1196 dev->min_mtu = ETH_MIN_MTU;
1197 /* The max_mtu calculation does not take account of GENEVE
1198 * options, to avoid excluding potentially valid
1199 * configurations. This will be further reduced by IPvX hdr size.
1200 */
1201 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1202
1203 netif_keep_dst(dev);
1204 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1205 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1206 eth_hw_addr_random(dev);
1207 }
1208
1209 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1210 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1211 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1212 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1213 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1214 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1215 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1216 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1217 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1218 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1219 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1220 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1221 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1222 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1223 };
1224
1225 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1226 struct netlink_ext_ack *extack)
1227 {
1228 if (tb[IFLA_ADDRESS]) {
1229 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1230 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1231 "Provided link layer address is not Ethernet");
1232 return -EINVAL;
1233 }
1234
1235 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1236 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1237 "Provided Ethernet address is not unicast");
1238 return -EADDRNOTAVAIL;
1239 }
1240 }
1241
1242 if (!data) {
1243 NL_SET_ERR_MSG(extack,
1244 "Not enough attributes provided to perform the operation");
1245 return -EINVAL;
1246 }
1247
1248 if (data[IFLA_GENEVE_ID]) {
1249 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1250
1251 if (vni >= GENEVE_N_VID) {
1252 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1253 "Geneve ID must be lower than 16777216");
1254 return -ERANGE;
1255 }
1256 }
1257
1258 if (data[IFLA_GENEVE_DF]) {
1259 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1260
1261 if (df < 0 || df > GENEVE_DF_MAX) {
1262 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1263 "Invalid DF attribute");
1264 return -EINVAL;
1265 }
1266 }
1267
1268 return 0;
1269 }
1270
1271 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1272 const struct ip_tunnel_info *info,
1273 bool *tun_on_same_port,
1274 bool *tun_collect_md)
1275 {
1276 struct geneve_dev *geneve, *t = NULL;
1277
1278 *tun_on_same_port = false;
1279 *tun_collect_md = false;
1280 list_for_each_entry(geneve, &gn->geneve_list, next) {
1281 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1282 *tun_collect_md = geneve->cfg.collect_md;
1283 *tun_on_same_port = true;
1284 }
1285 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1286 info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1287 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1288 t = geneve;
1289 }
1290 return t;
1291 }
1292
1293 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1294 {
1295 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1296 info->key.ttl || info->key.label || info->key.tp_src ||
1297 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1298 }
1299
1300 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1301 struct ip_tunnel_info *b)
1302 {
1303 if (ip_tunnel_info_af(a) == AF_INET)
1304 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1305 else
1306 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1307 }
1308
1309 static int geneve_configure(struct net *net, struct net_device *dev,
1310 struct netlink_ext_ack *extack,
1311 const struct geneve_config *cfg)
1312 {
1313 struct geneve_net *gn = net_generic(net, geneve_net_id);
1314 struct geneve_dev *t, *geneve = netdev_priv(dev);
1315 const struct ip_tunnel_info *info = &cfg->info;
1316 bool tun_collect_md, tun_on_same_port;
1317 int err, encap_len;
1318
1319 if (cfg->collect_md && !is_tnl_info_zero(info)) {
1320 NL_SET_ERR_MSG(extack,
1321 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1322 return -EINVAL;
1323 }
1324
1325 geneve->net = net;
1326 geneve->dev = dev;
1327
1328 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1329 if (t)
1330 return -EBUSY;
1331
1332 /* make enough headroom for basic scenario */
1333 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1334 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1335 encap_len += sizeof(struct iphdr);
1336 dev->max_mtu -= sizeof(struct iphdr);
1337 } else {
1338 encap_len += sizeof(struct ipv6hdr);
1339 dev->max_mtu -= sizeof(struct ipv6hdr);
1340 }
1341 dev->needed_headroom = encap_len + ETH_HLEN;
1342
1343 if (cfg->collect_md) {
1344 if (tun_on_same_port) {
1345 NL_SET_ERR_MSG(extack,
1346 "There can be only one externally controlled device on a destination port");
1347 return -EPERM;
1348 }
1349 } else {
1350 if (tun_collect_md) {
1351 NL_SET_ERR_MSG(extack,
1352 "There already exists an externally controlled device on this destination port");
1353 return -EPERM;
1354 }
1355 }
1356
1357 dst_cache_reset(&geneve->cfg.info.dst_cache);
1358 memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1359
1360 err = register_netdevice(dev);
1361 if (err)
1362 return err;
1363
1364 list_add(&geneve->next, &gn->geneve_list);
1365 return 0;
1366 }
1367
1368 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1369 {
1370 memset(info, 0, sizeof(*info));
1371 info->key.tp_dst = htons(dst_port);
1372 }
1373
1374 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1375 struct netlink_ext_ack *extack,
1376 struct geneve_config *cfg, bool changelink)
1377 {
1378 struct ip_tunnel_info *info = &cfg->info;
1379 int attrtype;
1380
1381 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1382 NL_SET_ERR_MSG(extack,
1383 "Cannot specify both IPv4 and IPv6 Remote addresses");
1384 return -EINVAL;
1385 }
1386
1387 if (data[IFLA_GENEVE_REMOTE]) {
1388 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1389 attrtype = IFLA_GENEVE_REMOTE;
1390 goto change_notsup;
1391 }
1392
1393 info->key.u.ipv4.dst =
1394 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1395
1396 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1397 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1398 "Remote IPv4 address cannot be Multicast");
1399 return -EINVAL;
1400 }
1401 }
1402
1403 if (data[IFLA_GENEVE_REMOTE6]) {
1404 #if IS_ENABLED(CONFIG_IPV6)
1405 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1406 attrtype = IFLA_GENEVE_REMOTE6;
1407 goto change_notsup;
1408 }
1409
1410 info->mode = IP_TUNNEL_INFO_IPV6;
1411 info->key.u.ipv6.dst =
1412 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1413
1414 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1415 IPV6_ADDR_LINKLOCAL) {
1416 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1417 "Remote IPv6 address cannot be link-local");
1418 return -EINVAL;
1419 }
1420 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1421 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1422 "Remote IPv6 address cannot be Multicast");
1423 return -EINVAL;
1424 }
1425 info->key.tun_flags |= TUNNEL_CSUM;
1426 cfg->use_udp6_rx_checksums = true;
1427 #else
1428 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1429 "IPv6 support not enabled in the kernel");
1430 return -EPFNOSUPPORT;
1431 #endif
1432 }
1433
1434 if (data[IFLA_GENEVE_ID]) {
1435 __u32 vni;
1436 __u8 tvni[3];
1437 __be64 tunid;
1438
1439 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1440 tvni[0] = (vni & 0x00ff0000) >> 16;
1441 tvni[1] = (vni & 0x0000ff00) >> 8;
1442 tvni[2] = vni & 0x000000ff;
1443
1444 tunid = vni_to_tunnel_id(tvni);
1445 if (changelink && (tunid != info->key.tun_id)) {
1446 attrtype = IFLA_GENEVE_ID;
1447 goto change_notsup;
1448 }
1449 info->key.tun_id = tunid;
1450 }
1451
1452 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1453 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1454 cfg->ttl_inherit = true;
1455 else
1456 cfg->ttl_inherit = false;
1457 } else if (data[IFLA_GENEVE_TTL]) {
1458 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1459 cfg->ttl_inherit = false;
1460 }
1461
1462 if (data[IFLA_GENEVE_TOS])
1463 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1464
1465 if (data[IFLA_GENEVE_DF])
1466 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1467
1468 if (data[IFLA_GENEVE_LABEL]) {
1469 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1470 IPV6_FLOWLABEL_MASK;
1471 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1472 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1473 "Label attribute only applies for IPv6 Geneve devices");
1474 return -EINVAL;
1475 }
1476 }
1477
1478 if (data[IFLA_GENEVE_PORT]) {
1479 if (changelink) {
1480 attrtype = IFLA_GENEVE_PORT;
1481 goto change_notsup;
1482 }
1483 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1484 }
1485
1486 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1487 if (changelink) {
1488 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1489 goto change_notsup;
1490 }
1491 cfg->collect_md = true;
1492 }
1493
1494 if (data[IFLA_GENEVE_UDP_CSUM]) {
1495 if (changelink) {
1496 attrtype = IFLA_GENEVE_UDP_CSUM;
1497 goto change_notsup;
1498 }
1499 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1500 info->key.tun_flags |= TUNNEL_CSUM;
1501 }
1502
1503 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1504 #if IS_ENABLED(CONFIG_IPV6)
1505 if (changelink) {
1506 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1507 goto change_notsup;
1508 }
1509 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1510 info->key.tun_flags &= ~TUNNEL_CSUM;
1511 #else
1512 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1513 "IPv6 support not enabled in the kernel");
1514 return -EPFNOSUPPORT;
1515 #endif
1516 }
1517
1518 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1519 #if IS_ENABLED(CONFIG_IPV6)
1520 if (changelink) {
1521 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1522 goto change_notsup;
1523 }
1524 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1525 cfg->use_udp6_rx_checksums = false;
1526 #else
1527 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1528 "IPv6 support not enabled in the kernel");
1529 return -EPFNOSUPPORT;
1530 #endif
1531 }
1532
1533 return 0;
1534 change_notsup:
1535 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1536 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1537 return -EOPNOTSUPP;
1538 }
1539
1540 static void geneve_link_config(struct net_device *dev,
1541 struct ip_tunnel_info *info, struct nlattr *tb[])
1542 {
1543 struct geneve_dev *geneve = netdev_priv(dev);
1544 int ldev_mtu = 0;
1545
1546 if (tb[IFLA_MTU]) {
1547 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1548 return;
1549 }
1550
1551 switch (ip_tunnel_info_af(info)) {
1552 case AF_INET: {
1553 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1554 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1555
1556 if (!IS_ERR(rt) && rt->dst.dev) {
1557 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1558 ip_rt_put(rt);
1559 }
1560 break;
1561 }
1562 #if IS_ENABLED(CONFIG_IPV6)
1563 case AF_INET6: {
1564 struct rt6_info *rt;
1565
1566 if (!__in6_dev_get(dev))
1567 break;
1568
1569 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1570 NULL, 0);
1571
1572 if (rt && rt->dst.dev)
1573 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1574 ip6_rt_put(rt);
1575 break;
1576 }
1577 #endif
1578 }
1579
1580 if (ldev_mtu <= 0)
1581 return;
1582
1583 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1584 }
1585
1586 static int geneve_newlink(struct net *net, struct net_device *dev,
1587 struct nlattr *tb[], struct nlattr *data[],
1588 struct netlink_ext_ack *extack)
1589 {
1590 struct geneve_config cfg = {
1591 .df = GENEVE_DF_UNSET,
1592 .use_udp6_rx_checksums = false,
1593 .ttl_inherit = false,
1594 .collect_md = false,
1595 };
1596 int err;
1597
1598 init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1599 err = geneve_nl2info(tb, data, extack, &cfg, false);
1600 if (err)
1601 return err;
1602
1603 err = geneve_configure(net, dev, extack, &cfg);
1604 if (err)
1605 return err;
1606
1607 geneve_link_config(dev, &cfg.info, tb);
1608
1609 return 0;
1610 }
1611
1612 /* Quiesces the geneve device data path for both TX and RX.
1613 *
1614 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1615 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1616 * to complete for the existing set of in-flight packets to be transmitted,
1617 * then we would have quiesced the transmit data path. All the future packets
1618 * will get dropped until we unquiesce the data path.
1619 *
1620 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1621 * if we set that to NULL under RCU and wait for synchronize_net() to
1622 * complete, then we would have quiesced the receive data path.
1623 */
1624 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1625 struct geneve_sock **gs6)
1626 {
1627 *gs4 = rtnl_dereference(geneve->sock4);
1628 rcu_assign_pointer(geneve->sock4, NULL);
1629 if (*gs4)
1630 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1631 #if IS_ENABLED(CONFIG_IPV6)
1632 *gs6 = rtnl_dereference(geneve->sock6);
1633 rcu_assign_pointer(geneve->sock6, NULL);
1634 if (*gs6)
1635 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1636 #else
1637 *gs6 = NULL;
1638 #endif
1639 synchronize_net();
1640 }
1641
1642 /* Resumes the geneve device data path for both TX and RX. */
1643 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1644 struct geneve_sock __maybe_unused *gs6)
1645 {
1646 rcu_assign_pointer(geneve->sock4, gs4);
1647 if (gs4)
1648 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1649 #if IS_ENABLED(CONFIG_IPV6)
1650 rcu_assign_pointer(geneve->sock6, gs6);
1651 if (gs6)
1652 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1653 #endif
1654 synchronize_net();
1655 }
1656
1657 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1658 struct nlattr *data[],
1659 struct netlink_ext_ack *extack)
1660 {
1661 struct geneve_dev *geneve = netdev_priv(dev);
1662 struct geneve_sock *gs4, *gs6;
1663 struct geneve_config cfg;
1664 int err;
1665
1666 /* If the geneve device is configured for metadata (or externally
1667 * controlled, for example, OVS), then nothing can be changed.
1668 */
1669 if (geneve->cfg.collect_md)
1670 return -EOPNOTSUPP;
1671
1672 /* Start with the existing info. */
1673 memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1674 err = geneve_nl2info(tb, data, extack, &cfg, true);
1675 if (err)
1676 return err;
1677
1678 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1679 dst_cache_reset(&cfg.info.dst_cache);
1680 geneve_link_config(dev, &cfg.info, tb);
1681 }
1682
1683 geneve_quiesce(geneve, &gs4, &gs6);
1684 memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1685 geneve_unquiesce(geneve, gs4, gs6);
1686
1687 return 0;
1688 }
1689
1690 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1691 {
1692 struct geneve_dev *geneve = netdev_priv(dev);
1693
1694 list_del(&geneve->next);
1695 unregister_netdevice_queue(dev, head);
1696 }
1697
1698 static size_t geneve_get_size(const struct net_device *dev)
1699 {
1700 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1701 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1702 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1703 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1704 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1705 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1706 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1707 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1708 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1709 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1710 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1711 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1712 0;
1713 }
1714
1715 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1716 {
1717 struct geneve_dev *geneve = netdev_priv(dev);
1718 struct ip_tunnel_info *info = &geneve->cfg.info;
1719 bool ttl_inherit = geneve->cfg.ttl_inherit;
1720 bool metadata = geneve->cfg.collect_md;
1721 __u8 tmp_vni[3];
1722 __u32 vni;
1723
1724 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1725 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1726 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1727 goto nla_put_failure;
1728
1729 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1730 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1731 info->key.u.ipv4.dst))
1732 goto nla_put_failure;
1733 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1734 !!(info->key.tun_flags & TUNNEL_CSUM)))
1735 goto nla_put_failure;
1736
1737 #if IS_ENABLED(CONFIG_IPV6)
1738 } else if (!metadata) {
1739 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1740 &info->key.u.ipv6.dst))
1741 goto nla_put_failure;
1742 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1743 !(info->key.tun_flags & TUNNEL_CSUM)))
1744 goto nla_put_failure;
1745 #endif
1746 }
1747
1748 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1749 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1750 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1751 goto nla_put_failure;
1752
1753 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1754 goto nla_put_failure;
1755
1756 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1757 goto nla_put_failure;
1758
1759 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1760 goto nla_put_failure;
1761
1762 #if IS_ENABLED(CONFIG_IPV6)
1763 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1764 !geneve->cfg.use_udp6_rx_checksums))
1765 goto nla_put_failure;
1766 #endif
1767
1768 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1769 goto nla_put_failure;
1770
1771 return 0;
1772
1773 nla_put_failure:
1774 return -EMSGSIZE;
1775 }
1776
1777 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1778 .kind = "geneve",
1779 .maxtype = IFLA_GENEVE_MAX,
1780 .policy = geneve_policy,
1781 .priv_size = sizeof(struct geneve_dev),
1782 .setup = geneve_setup,
1783 .validate = geneve_validate,
1784 .newlink = geneve_newlink,
1785 .changelink = geneve_changelink,
1786 .dellink = geneve_dellink,
1787 .get_size = geneve_get_size,
1788 .fill_info = geneve_fill_info,
1789 };
1790
1791 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1792 u8 name_assign_type, u16 dst_port)
1793 {
1794 struct nlattr *tb[IFLA_MAX + 1];
1795 struct net_device *dev;
1796 LIST_HEAD(list_kill);
1797 int err;
1798 struct geneve_config cfg = {
1799 .df = GENEVE_DF_UNSET,
1800 .use_udp6_rx_checksums = true,
1801 .ttl_inherit = false,
1802 .collect_md = true,
1803 };
1804
1805 memset(tb, 0, sizeof(tb));
1806 dev = rtnl_create_link(net, name, name_assign_type,
1807 &geneve_link_ops, tb, NULL);
1808 if (IS_ERR(dev))
1809 return dev;
1810
1811 init_tnl_info(&cfg.info, dst_port);
1812 err = geneve_configure(net, dev, NULL, &cfg);
1813 if (err) {
1814 free_netdev(dev);
1815 return ERR_PTR(err);
1816 }
1817
1818 /* openvswitch users expect packet sizes to be unrestricted,
1819 * so set the largest MTU we can.
1820 */
1821 err = geneve_change_mtu(dev, IP_MAX_MTU);
1822 if (err)
1823 goto err;
1824
1825 err = rtnl_configure_link(dev, NULL);
1826 if (err < 0)
1827 goto err;
1828
1829 return dev;
1830 err:
1831 geneve_dellink(dev, &list_kill);
1832 unregister_netdevice_many(&list_kill);
1833 return ERR_PTR(err);
1834 }
1835 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1836
1837 static int geneve_netdevice_event(struct notifier_block *unused,
1838 unsigned long event, void *ptr)
1839 {
1840 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1841
1842 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1843 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1844 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1845 } else if (event == NETDEV_UNREGISTER) {
1846 if (!dev->udp_tunnel_nic_info)
1847 geneve_offload_rx_ports(dev, false);
1848 } else if (event == NETDEV_REGISTER) {
1849 if (!dev->udp_tunnel_nic_info)
1850 geneve_offload_rx_ports(dev, true);
1851 }
1852
1853 return NOTIFY_DONE;
1854 }
1855
1856 static struct notifier_block geneve_notifier_block __read_mostly = {
1857 .notifier_call = geneve_netdevice_event,
1858 };
1859
1860 static __net_init int geneve_init_net(struct net *net)
1861 {
1862 struct geneve_net *gn = net_generic(net, geneve_net_id);
1863
1864 INIT_LIST_HEAD(&gn->geneve_list);
1865 INIT_LIST_HEAD(&gn->sock_list);
1866 return 0;
1867 }
1868
1869 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1870 {
1871 struct geneve_net *gn = net_generic(net, geneve_net_id);
1872 struct geneve_dev *geneve, *next;
1873 struct net_device *dev, *aux;
1874
1875 /* gather any geneve devices that were moved into this ns */
1876 for_each_netdev_safe(net, dev, aux)
1877 if (dev->rtnl_link_ops == &geneve_link_ops)
1878 unregister_netdevice_queue(dev, head);
1879
1880 /* now gather any other geneve devices that were created in this ns */
1881 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1882 /* If geneve->dev is in the same netns, it was already added
1883 * to the list by the previous loop.
1884 */
1885 if (!net_eq(dev_net(geneve->dev), net))
1886 unregister_netdevice_queue(geneve->dev, head);
1887 }
1888 }
1889
1890 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1891 {
1892 struct net *net;
1893 LIST_HEAD(list);
1894
1895 rtnl_lock();
1896 list_for_each_entry(net, net_list, exit_list)
1897 geneve_destroy_tunnels(net, &list);
1898
1899 /* unregister the devices gathered above */
1900 unregister_netdevice_many(&list);
1901 rtnl_unlock();
1902
1903 list_for_each_entry(net, net_list, exit_list) {
1904 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1905
1906 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1907 }
1908 }
1909
1910 static struct pernet_operations geneve_net_ops = {
1911 .init = geneve_init_net,
1912 .exit_batch = geneve_exit_batch_net,
1913 .id = &geneve_net_id,
1914 .size = sizeof(struct geneve_net),
1915 };
1916
1917 static int __init geneve_init_module(void)
1918 {
1919 int rc;
1920
1921 rc = register_pernet_subsys(&geneve_net_ops);
1922 if (rc)
1923 goto out1;
1924
1925 rc = register_netdevice_notifier(&geneve_notifier_block);
1926 if (rc)
1927 goto out2;
1928
1929 rc = rtnl_link_register(&geneve_link_ops);
1930 if (rc)
1931 goto out3;
1932
1933 return 0;
1934 out3:
1935 unregister_netdevice_notifier(&geneve_notifier_block);
1936 out2:
1937 unregister_pernet_subsys(&geneve_net_ops);
1938 out1:
1939 return rc;
1940 }
1941 late_initcall(geneve_init_module);
1942
1943 static void __exit geneve_cleanup_module(void)
1944 {
1945 rtnl_link_unregister(&geneve_link_ops);
1946 unregister_netdevice_notifier(&geneve_notifier_block);
1947 unregister_pernet_subsys(&geneve_net_ops);
1948 }
1949 module_exit(geneve_cleanup_module);
1950
1951 MODULE_LICENSE("GPL");
1952 MODULE_VERSION(GENEVE_NETDEV_VER);
1953 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1954 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1955 MODULE_ALIAS_RTNL_LINK("geneve");
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