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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/ethtool.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/etherdevice.h>
14#include <linux/hash.h>
15#include <net/ipv6_stubs.h>
16#include <net/dst_metadata.h>
17#include <net/gro_cells.h>
18#include <net/rtnetlink.h>
19#include <net/geneve.h>
20#include <net/protocol.h>
21
22#define GENEVE_NETDEV_VER "0.6"
23
24#define GENEVE_N_VID (1u << 24)
25#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
26
27#define VNI_HASH_BITS 10
28#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
29
30static bool log_ecn_error = true;
31module_param(log_ecn_error, bool, 0644);
32MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
33
34#define GENEVE_VER 0
35#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
36#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
37#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
38
39/* per-network namespace private data for this module */
40struct geneve_net {
41 struct list_head geneve_list;
42 struct list_head sock_list;
43};
44
45static unsigned int geneve_net_id;
46
47struct geneve_dev_node {
48 struct hlist_node hlist;
49 struct geneve_dev *geneve;
50};
51
52struct geneve_config {
53 struct ip_tunnel_info info;
54 bool collect_md;
55 bool use_udp6_rx_checksums;
56 bool ttl_inherit;
57 enum ifla_geneve_df df;
58};
59
60/* Pseudo network device */
61struct geneve_dev {
62 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
63#if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
65#endif
66 struct net *net; /* netns for packet i/o */
67 struct net_device *dev; /* netdev for geneve tunnel */
68 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
69#if IS_ENABLED(CONFIG_IPV6)
70 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
71#endif
72 struct list_head next; /* geneve's per namespace list */
73 struct gro_cells gro_cells;
74 struct geneve_config cfg;
75};
76
77struct geneve_sock {
78 bool collect_md;
79 struct list_head list;
80 struct socket *sock;
81 struct rcu_head rcu;
82 int refcnt;
83 struct hlist_head vni_list[VNI_HASH_SIZE];
84};
85
86static inline __u32 geneve_net_vni_hash(u8 vni[3])
87{
88 __u32 vnid;
89
90 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
91 return hash_32(vnid, VNI_HASH_BITS);
92}
93
94static __be64 vni_to_tunnel_id(const __u8 *vni)
95{
96#ifdef __BIG_ENDIAN
97 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
98#else
99 return (__force __be64)(((__force u64)vni[0] << 40) |
100 ((__force u64)vni[1] << 48) |
101 ((__force u64)vni[2] << 56));
102#endif
103}
104
105/* Convert 64 bit tunnel ID to 24 bit VNI. */
106static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
107{
108#ifdef __BIG_ENDIAN
109 vni[0] = (__force __u8)(tun_id >> 16);
110 vni[1] = (__force __u8)(tun_id >> 8);
111 vni[2] = (__force __u8)tun_id;
112#else
113 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
114 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
115 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
116#endif
117}
118
119static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
120{
121 return !memcmp(vni, &tun_id[5], 3);
122}
123
124static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
125{
126 return gs->sock->sk->sk_family;
127}
128
129static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
130 __be32 addr, u8 vni[])
131{
132 struct hlist_head *vni_list_head;
133 struct geneve_dev_node *node;
134 __u32 hash;
135
136 /* Find the device for this VNI */
137 hash = geneve_net_vni_hash(vni);
138 vni_list_head = &gs->vni_list[hash];
139 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
140 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
141 addr == node->geneve->cfg.info.key.u.ipv4.dst)
142 return node->geneve;
143 }
144 return NULL;
145}
146
147#if IS_ENABLED(CONFIG_IPV6)
148static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
149 struct in6_addr addr6, u8 vni[])
150{
151 struct hlist_head *vni_list_head;
152 struct geneve_dev_node *node;
153 __u32 hash;
154
155 /* Find the device for this VNI */
156 hash = geneve_net_vni_hash(vni);
157 vni_list_head = &gs->vni_list[hash];
158 hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
159 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
160 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
161 return node->geneve;
162 }
163 return NULL;
164}
165#endif
166
167static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
168{
169 return (struct genevehdr *)(udp_hdr(skb) + 1);
170}
171
172static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
173 struct sk_buff *skb)
174{
175 static u8 zero_vni[3];
176 u8 *vni;
177
178 if (geneve_get_sk_family(gs) == AF_INET) {
179 struct iphdr *iph;
180 __be32 addr;
181
182 iph = ip_hdr(skb); /* outer IP header... */
183
184 if (gs->collect_md) {
185 vni = zero_vni;
186 addr = 0;
187 } else {
188 vni = geneve_hdr(skb)->vni;
189 addr = iph->saddr;
190 }
191
192 return geneve_lookup(gs, addr, vni);
193#if IS_ENABLED(CONFIG_IPV6)
194 } else if (geneve_get_sk_family(gs) == AF_INET6) {
195 static struct in6_addr zero_addr6;
196 struct ipv6hdr *ip6h;
197 struct in6_addr addr6;
198
199 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
200
201 if (gs->collect_md) {
202 vni = zero_vni;
203 addr6 = zero_addr6;
204 } else {
205 vni = geneve_hdr(skb)->vni;
206 addr6 = ip6h->saddr;
207 }
208
209 return geneve6_lookup(gs, addr6, vni);
210#endif
211 }
212 return NULL;
213}
214
215/* geneve receive/decap routine */
216static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
217 struct sk_buff *skb)
218{
219 struct genevehdr *gnvh = geneve_hdr(skb);
220 struct metadata_dst *tun_dst = NULL;
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 | (gnvh->oam ? TUNNEL_OAM : 0) |
229 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
230
231 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
232 vni_to_tunnel_id(gnvh->vni),
233 gnvh->opt_len * 4);
234 if (!tun_dst) {
235 geneve->dev->stats.rx_dropped++;
236 goto drop;
237 }
238 /* Update tunnel dst according to Geneve options. */
239 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
240 gnvh->options, gnvh->opt_len * 4,
241 TUNNEL_GENEVE_OPT);
242 } else {
243 /* Drop packets w/ critical options,
244 * since we don't support any...
245 */
246 if (gnvh->critical) {
247 geneve->dev->stats.rx_frame_errors++;
248 geneve->dev->stats.rx_errors++;
249 goto drop;
250 }
251 }
252
253 skb_reset_mac_header(skb);
254 skb->protocol = eth_type_trans(skb, geneve->dev);
255 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
256
257 if (tun_dst)
258 skb_dst_set(skb, &tun_dst->dst);
259
260 /* Ignore packet loops (and multicast echo) */
261 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
262 geneve->dev->stats.rx_errors++;
263 goto drop;
264 }
265
266 oiph = skb_network_header(skb);
267 skb_reset_network_header(skb);
268
269 if (geneve_get_sk_family(gs) == AF_INET)
270 err = IP_ECN_decapsulate(oiph, skb);
271#if IS_ENABLED(CONFIG_IPV6)
272 else
273 err = IP6_ECN_decapsulate(oiph, skb);
274#endif
275
276 if (unlikely(err)) {
277 if (log_ecn_error) {
278 if (geneve_get_sk_family(gs) == AF_INET)
279 net_info_ratelimited("non-ECT from %pI4 "
280 "with TOS=%#x\n",
281 &((struct iphdr *)oiph)->saddr,
282 ((struct iphdr *)oiph)->tos);
283#if IS_ENABLED(CONFIG_IPV6)
284 else
285 net_info_ratelimited("non-ECT from %pI6\n",
286 &((struct ipv6hdr *)oiph)->saddr);
287#endif
288 }
289 if (err > 1) {
290 ++geneve->dev->stats.rx_frame_errors;
291 ++geneve->dev->stats.rx_errors;
292 goto drop;
293 }
294 }
295
296 len = skb->len;
297 err = gro_cells_receive(&geneve->gro_cells, skb);
298 if (likely(err == NET_RX_SUCCESS))
299 dev_sw_netstats_rx_add(geneve->dev, len);
300
301 return;
302drop:
303 /* Consume bad packet */
304 kfree_skb(skb);
305}
306
307/* Setup stats when device is created */
308static int geneve_init(struct net_device *dev)
309{
310 struct geneve_dev *geneve = netdev_priv(dev);
311 int err;
312
313 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
314 if (!dev->tstats)
315 return -ENOMEM;
316
317 err = gro_cells_init(&geneve->gro_cells, dev);
318 if (err) {
319 free_percpu(dev->tstats);
320 return err;
321 }
322
323 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
324 if (err) {
325 free_percpu(dev->tstats);
326 gro_cells_destroy(&geneve->gro_cells);
327 return err;
328 }
329 return 0;
330}
331
332static void geneve_uninit(struct net_device *dev)
333{
334 struct geneve_dev *geneve = netdev_priv(dev);
335
336 dst_cache_destroy(&geneve->cfg.info.dst_cache);
337 gro_cells_destroy(&geneve->gro_cells);
338 free_percpu(dev->tstats);
339}
340
341/* Callback from net/ipv4/udp.c to receive packets */
342static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
343{
344 struct genevehdr *geneveh;
345 struct geneve_dev *geneve;
346 struct geneve_sock *gs;
347 int opts_len;
348
349 /* Need UDP and Geneve header to be present */
350 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
351 goto drop;
352
353 /* Return packets with reserved bits set */
354 geneveh = geneve_hdr(skb);
355 if (unlikely(geneveh->ver != GENEVE_VER))
356 goto drop;
357
358 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
359 goto drop;
360
361 gs = rcu_dereference_sk_user_data(sk);
362 if (!gs)
363 goto drop;
364
365 geneve = geneve_lookup_skb(gs, skb);
366 if (!geneve)
367 goto drop;
368
369 opts_len = geneveh->opt_len * 4;
370 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
371 htons(ETH_P_TEB),
372 !net_eq(geneve->net, dev_net(geneve->dev)))) {
373 geneve->dev->stats.rx_dropped++;
374 goto drop;
375 }
376
377 geneve_rx(geneve, gs, skb);
378 return 0;
379
380drop:
381 /* Consume bad packet */
382 kfree_skb(skb);
383 return 0;
384}
385
386/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
387static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
388{
389 struct genevehdr *geneveh;
390 struct geneve_sock *gs;
391 u8 zero_vni[3] = { 0 };
392 u8 *vni = zero_vni;
393
394 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
395 return -EINVAL;
396
397 geneveh = geneve_hdr(skb);
398 if (geneveh->ver != GENEVE_VER)
399 return -EINVAL;
400
401 if (geneveh->proto_type != htons(ETH_P_TEB))
402 return -EINVAL;
403
404 gs = rcu_dereference_sk_user_data(sk);
405 if (!gs)
406 return -ENOENT;
407
408 if (geneve_get_sk_family(gs) == AF_INET) {
409 struct iphdr *iph = ip_hdr(skb);
410 __be32 addr4 = 0;
411
412 if (!gs->collect_md) {
413 vni = geneve_hdr(skb)->vni;
414 addr4 = iph->daddr;
415 }
416
417 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
418 }
419
420#if IS_ENABLED(CONFIG_IPV6)
421 if (geneve_get_sk_family(gs) == AF_INET6) {
422 struct ipv6hdr *ip6h = ipv6_hdr(skb);
423 struct in6_addr addr6;
424
425 memset(&addr6, 0, sizeof(struct in6_addr));
426
427 if (!gs->collect_md) {
428 vni = geneve_hdr(skb)->vni;
429 addr6 = ip6h->daddr;
430 }
431
432 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
433 }
434#endif
435
436 return -EPFNOSUPPORT;
437}
438
439static struct socket *geneve_create_sock(struct net *net, bool ipv6,
440 __be16 port, bool ipv6_rx_csum)
441{
442 struct socket *sock;
443 struct udp_port_cfg udp_conf;
444 int err;
445
446 memset(&udp_conf, 0, sizeof(udp_conf));
447
448 if (ipv6) {
449 udp_conf.family = AF_INET6;
450 udp_conf.ipv6_v6only = 1;
451 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
452 } else {
453 udp_conf.family = AF_INET;
454 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
455 }
456
457 udp_conf.local_udp_port = port;
458
459 /* Open UDP socket */
460 err = udp_sock_create(net, &udp_conf, &sock);
461 if (err < 0)
462 return ERR_PTR(err);
463
464 udp_allow_gso(sock->sk);
465 return sock;
466}
467
468static int geneve_hlen(struct genevehdr *gh)
469{
470 return sizeof(*gh) + gh->opt_len * 4;
471}
472
473static 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
529out_unlock:
530 rcu_read_unlock();
531out:
532 skb_gro_flush_final(skb, pp, flush);
533
534 return pp;
535}
536
537static 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 */
563static 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
604static 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
615static 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
633static 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
648static 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->cfg.info.key.tp_dst);
658 if (gs) {
659 gs->refcnt++;
660 goto out;
661 }
662
663 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
664 geneve->cfg.use_udp6_rx_checksums);
665 if (IS_ERR(gs))
666 return PTR_ERR(gs);
667
668out:
669 gs->collect_md = geneve->cfg.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->cfg.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
688static int geneve_open(struct net_device *dev)
689{
690 struct geneve_dev *geneve = netdev_priv(dev);
691 bool metadata = geneve->cfg.collect_md;
692 bool ipv4, ipv6;
693 int ret = 0;
694
695 ipv6 = geneve->cfg.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
712static 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
724static 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
740static 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
767free_dst:
768 dst_release(dst);
769 return err;
770}
771
772static 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 __be16 dport, __be16 sport)
778{
779 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
780 struct geneve_dev *geneve = netdev_priv(dev);
781 struct dst_cache *dst_cache;
782 struct rtable *rt = NULL;
783 __u8 tos;
784
785 if (!gs4)
786 return ERR_PTR(-EIO);
787
788 memset(fl4, 0, sizeof(*fl4));
789 fl4->flowi4_mark = skb->mark;
790 fl4->flowi4_proto = IPPROTO_UDP;
791 fl4->daddr = info->key.u.ipv4.dst;
792 fl4->saddr = info->key.u.ipv4.src;
793 fl4->fl4_dport = dport;
794 fl4->fl4_sport = sport;
795
796 tos = info->key.tos;
797 if ((tos == 1) && !geneve->cfg.collect_md) {
798 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
799 use_cache = false;
800 }
801 fl4->flowi4_tos = RT_TOS(tos);
802
803 dst_cache = (struct dst_cache *)&info->dst_cache;
804 if (use_cache) {
805 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
806 if (rt)
807 return rt;
808 }
809 rt = ip_route_output_key(geneve->net, fl4);
810 if (IS_ERR(rt)) {
811 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
812 return ERR_PTR(-ENETUNREACH);
813 }
814 if (rt->dst.dev == dev) { /* is this necessary? */
815 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
816 ip_rt_put(rt);
817 return ERR_PTR(-ELOOP);
818 }
819 if (use_cache)
820 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
821 return rt;
822}
823
824#if IS_ENABLED(CONFIG_IPV6)
825static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
826 struct net_device *dev,
827 struct geneve_sock *gs6,
828 struct flowi6 *fl6,
829 const struct ip_tunnel_info *info,
830 __be16 dport, __be16 sport)
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 fl6->fl6_dport = dport;
847 fl6->fl6_sport = sport;
848
849 prio = info->key.tos;
850 if ((prio == 1) && !geneve->cfg.collect_md) {
851 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
852 use_cache = false;
853 }
854
855 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
856 info->key.label);
857 dst_cache = (struct dst_cache *)&info->dst_cache;
858 if (use_cache) {
859 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
860 if (dst)
861 return dst;
862 }
863 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
864 NULL);
865 if (IS_ERR(dst)) {
866 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
867 return ERR_PTR(-ENETUNREACH);
868 }
869 if (dst->dev == dev) { /* is this necessary? */
870 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
871 dst_release(dst);
872 return ERR_PTR(-ELOOP);
873 }
874
875 if (use_cache)
876 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
877 return dst;
878}
879#endif
880
881static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
882 struct geneve_dev *geneve,
883 const struct ip_tunnel_info *info)
884{
885 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
886 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
887 const struct ip_tunnel_key *key = &info->key;
888 struct rtable *rt;
889 struct flowi4 fl4;
890 __u8 tos, ttl;
891 __be16 df = 0;
892 __be16 sport;
893 int err;
894
895 if (!pskb_inet_may_pull(skb))
896 return -EINVAL;
897
898 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
899 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
900 geneve->cfg.info.key.tp_dst, sport);
901 if (IS_ERR(rt))
902 return PTR_ERR(rt);
903
904 err = skb_tunnel_check_pmtu(skb, &rt->dst,
905 GENEVE_IPV4_HLEN + info->options_len,
906 netif_is_any_bridge_port(dev));
907 if (err < 0) {
908 dst_release(&rt->dst);
909 return err;
910 } else if (err) {
911 struct ip_tunnel_info *info;
912
913 info = skb_tunnel_info(skb);
914 if (info) {
915 struct ip_tunnel_info *unclone;
916
917 unclone = skb_tunnel_info_unclone(skb);
918 if (unlikely(!unclone)) {
919 dst_release(&rt->dst);
920 return -ENOMEM;
921 }
922
923 unclone->key.u.ipv4.dst = fl4.saddr;
924 unclone->key.u.ipv4.src = fl4.daddr;
925 }
926
927 if (!pskb_may_pull(skb, ETH_HLEN)) {
928 dst_release(&rt->dst);
929 return -EINVAL;
930 }
931
932 skb->protocol = eth_type_trans(skb, geneve->dev);
933 netif_rx(skb);
934 dst_release(&rt->dst);
935 return -EMSGSIZE;
936 }
937
938 if (geneve->cfg.collect_md) {
939 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
940 ttl = key->ttl;
941
942 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
943 } else {
944 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
945 if (geneve->cfg.ttl_inherit)
946 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
947 else
948 ttl = key->ttl;
949 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
950
951 if (geneve->cfg.df == GENEVE_DF_SET) {
952 df = htons(IP_DF);
953 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
954 struct ethhdr *eth = eth_hdr(skb);
955
956 if (ntohs(eth->h_proto) == ETH_P_IPV6) {
957 df = htons(IP_DF);
958 } else if (ntohs(eth->h_proto) == ETH_P_IP) {
959 struct iphdr *iph = ip_hdr(skb);
960
961 if (iph->frag_off & htons(IP_DF))
962 df = htons(IP_DF);
963 }
964 }
965 }
966
967 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
968 if (unlikely(err))
969 return err;
970
971 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
972 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
973 !net_eq(geneve->net, dev_net(geneve->dev)),
974 !(info->key.tun_flags & TUNNEL_CSUM));
975 return 0;
976}
977
978#if IS_ENABLED(CONFIG_IPV6)
979static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
980 struct geneve_dev *geneve,
981 const struct ip_tunnel_info *info)
982{
983 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
984 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
985 const struct ip_tunnel_key *key = &info->key;
986 struct dst_entry *dst = NULL;
987 struct flowi6 fl6;
988 __u8 prio, ttl;
989 __be16 sport;
990 int err;
991
992 if (!pskb_inet_may_pull(skb))
993 return -EINVAL;
994
995 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
996 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
997 geneve->cfg.info.key.tp_dst, sport);
998 if (IS_ERR(dst))
999 return PTR_ERR(dst);
1000
1001 err = skb_tunnel_check_pmtu(skb, dst,
1002 GENEVE_IPV6_HLEN + info->options_len,
1003 netif_is_any_bridge_port(dev));
1004 if (err < 0) {
1005 dst_release(dst);
1006 return err;
1007 } else if (err) {
1008 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1009
1010 if (info) {
1011 struct ip_tunnel_info *unclone;
1012
1013 unclone = skb_tunnel_info_unclone(skb);
1014 if (unlikely(!unclone)) {
1015 dst_release(dst);
1016 return -ENOMEM;
1017 }
1018
1019 unclone->key.u.ipv6.dst = fl6.saddr;
1020 unclone->key.u.ipv6.src = fl6.daddr;
1021 }
1022
1023 if (!pskb_may_pull(skb, ETH_HLEN)) {
1024 dst_release(dst);
1025 return -EINVAL;
1026 }
1027
1028 skb->protocol = eth_type_trans(skb, geneve->dev);
1029 netif_rx(skb);
1030 dst_release(dst);
1031 return -EMSGSIZE;
1032 }
1033
1034 if (geneve->cfg.collect_md) {
1035 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1036 ttl = key->ttl;
1037 } else {
1038 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1039 ip_hdr(skb), skb);
1040 if (geneve->cfg.ttl_inherit)
1041 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1042 else
1043 ttl = key->ttl;
1044 ttl = ttl ? : ip6_dst_hoplimit(dst);
1045 }
1046 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1047 if (unlikely(err))
1048 return err;
1049
1050 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1051 &fl6.saddr, &fl6.daddr, prio, ttl,
1052 info->key.label, sport, geneve->cfg.info.key.tp_dst,
1053 !(info->key.tun_flags & TUNNEL_CSUM));
1054 return 0;
1055}
1056#endif
1057
1058static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1059{
1060 struct geneve_dev *geneve = netdev_priv(dev);
1061 struct ip_tunnel_info *info = NULL;
1062 int err;
1063
1064 if (geneve->cfg.collect_md) {
1065 info = skb_tunnel_info(skb);
1066 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1067 netdev_dbg(dev, "no tunnel metadata\n");
1068 dev_kfree_skb(skb);
1069 dev->stats.tx_dropped++;
1070 return NETDEV_TX_OK;
1071 }
1072 } else {
1073 info = &geneve->cfg.info;
1074 }
1075
1076 rcu_read_lock();
1077#if IS_ENABLED(CONFIG_IPV6)
1078 if (info->mode & IP_TUNNEL_INFO_IPV6)
1079 err = geneve6_xmit_skb(skb, dev, geneve, info);
1080 else
1081#endif
1082 err = geneve_xmit_skb(skb, dev, geneve, info);
1083 rcu_read_unlock();
1084
1085 if (likely(!err))
1086 return NETDEV_TX_OK;
1087
1088 if (err != -EMSGSIZE)
1089 dev_kfree_skb(skb);
1090
1091 if (err == -ELOOP)
1092 dev->stats.collisions++;
1093 else if (err == -ENETUNREACH)
1094 dev->stats.tx_carrier_errors++;
1095
1096 dev->stats.tx_errors++;
1097 return NETDEV_TX_OK;
1098}
1099
1100static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1101{
1102 if (new_mtu > dev->max_mtu)
1103 new_mtu = dev->max_mtu;
1104 else if (new_mtu < dev->min_mtu)
1105 new_mtu = dev->min_mtu;
1106
1107 dev->mtu = new_mtu;
1108 return 0;
1109}
1110
1111static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1112{
1113 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1114 struct geneve_dev *geneve = netdev_priv(dev);
1115 __be16 sport;
1116
1117 if (ip_tunnel_info_af(info) == AF_INET) {
1118 struct rtable *rt;
1119 struct flowi4 fl4;
1120
1121 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1122 sport = udp_flow_src_port(geneve->net, skb,
1123 1, USHRT_MAX, true);
1124
1125 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1126 geneve->cfg.info.key.tp_dst, sport);
1127 if (IS_ERR(rt))
1128 return PTR_ERR(rt);
1129
1130 ip_rt_put(rt);
1131 info->key.u.ipv4.src = fl4.saddr;
1132#if IS_ENABLED(CONFIG_IPV6)
1133 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1134 struct dst_entry *dst;
1135 struct flowi6 fl6;
1136
1137 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1138 sport = udp_flow_src_port(geneve->net, skb,
1139 1, USHRT_MAX, true);
1140
1141 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1142 geneve->cfg.info.key.tp_dst, sport);
1143 if (IS_ERR(dst))
1144 return PTR_ERR(dst);
1145
1146 dst_release(dst);
1147 info->key.u.ipv6.src = fl6.saddr;
1148#endif
1149 } else {
1150 return -EINVAL;
1151 }
1152
1153 info->key.tp_src = sport;
1154 info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1155 return 0;
1156}
1157
1158static const struct net_device_ops geneve_netdev_ops = {
1159 .ndo_init = geneve_init,
1160 .ndo_uninit = geneve_uninit,
1161 .ndo_open = geneve_open,
1162 .ndo_stop = geneve_stop,
1163 .ndo_start_xmit = geneve_xmit,
1164 .ndo_get_stats64 = dev_get_tstats64,
1165 .ndo_change_mtu = geneve_change_mtu,
1166 .ndo_validate_addr = eth_validate_addr,
1167 .ndo_set_mac_address = eth_mac_addr,
1168 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1169};
1170
1171static void geneve_get_drvinfo(struct net_device *dev,
1172 struct ethtool_drvinfo *drvinfo)
1173{
1174 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1175 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1176}
1177
1178static const struct ethtool_ops geneve_ethtool_ops = {
1179 .get_drvinfo = geneve_get_drvinfo,
1180 .get_link = ethtool_op_get_link,
1181};
1182
1183/* Info for udev, that this is a virtual tunnel endpoint */
1184static struct device_type geneve_type = {
1185 .name = "geneve",
1186};
1187
1188/* Calls the ndo_udp_tunnel_add of the caller in order to
1189 * supply the listening GENEVE udp ports. Callers are expected
1190 * to implement the ndo_udp_tunnel_add.
1191 */
1192static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1193{
1194 struct net *net = dev_net(dev);
1195 struct geneve_net *gn = net_generic(net, geneve_net_id);
1196 struct geneve_sock *gs;
1197
1198 rcu_read_lock();
1199 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1200 if (push) {
1201 udp_tunnel_push_rx_port(dev, gs->sock,
1202 UDP_TUNNEL_TYPE_GENEVE);
1203 } else {
1204 udp_tunnel_drop_rx_port(dev, gs->sock,
1205 UDP_TUNNEL_TYPE_GENEVE);
1206 }
1207 }
1208 rcu_read_unlock();
1209}
1210
1211/* Initialize the device structure. */
1212static void geneve_setup(struct net_device *dev)
1213{
1214 ether_setup(dev);
1215
1216 dev->netdev_ops = &geneve_netdev_ops;
1217 dev->ethtool_ops = &geneve_ethtool_ops;
1218 dev->needs_free_netdev = true;
1219
1220 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1221
1222 dev->features |= NETIF_F_LLTX;
1223 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1224 dev->features |= NETIF_F_RXCSUM;
1225 dev->features |= NETIF_F_GSO_SOFTWARE;
1226
1227 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1228 dev->hw_features |= NETIF_F_RXCSUM;
1229 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1230
1231 /* MTU range: 68 - (something less than 65535) */
1232 dev->min_mtu = ETH_MIN_MTU;
1233 /* The max_mtu calculation does not take account of GENEVE
1234 * options, to avoid excluding potentially valid
1235 * configurations. This will be further reduced by IPvX hdr size.
1236 */
1237 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1238
1239 netif_keep_dst(dev);
1240 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1241 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1242 eth_hw_addr_random(dev);
1243}
1244
1245static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1246 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1247 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
1248 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1249 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1250 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1251 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1252 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1253 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1254 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1255 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1256 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1257 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 },
1258 [IFLA_GENEVE_DF] = { .type = NLA_U8 },
1259};
1260
1261static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1262 struct netlink_ext_ack *extack)
1263{
1264 if (tb[IFLA_ADDRESS]) {
1265 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1266 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1267 "Provided link layer address is not Ethernet");
1268 return -EINVAL;
1269 }
1270
1271 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1272 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1273 "Provided Ethernet address is not unicast");
1274 return -EADDRNOTAVAIL;
1275 }
1276 }
1277
1278 if (!data) {
1279 NL_SET_ERR_MSG(extack,
1280 "Not enough attributes provided to perform the operation");
1281 return -EINVAL;
1282 }
1283
1284 if (data[IFLA_GENEVE_ID]) {
1285 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1286
1287 if (vni >= GENEVE_N_VID) {
1288 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1289 "Geneve ID must be lower than 16777216");
1290 return -ERANGE;
1291 }
1292 }
1293
1294 if (data[IFLA_GENEVE_DF]) {
1295 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1296
1297 if (df < 0 || df > GENEVE_DF_MAX) {
1298 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1299 "Invalid DF attribute");
1300 return -EINVAL;
1301 }
1302 }
1303
1304 return 0;
1305}
1306
1307static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1308 const struct ip_tunnel_info *info,
1309 bool *tun_on_same_port,
1310 bool *tun_collect_md)
1311{
1312 struct geneve_dev *geneve, *t = NULL;
1313
1314 *tun_on_same_port = false;
1315 *tun_collect_md = false;
1316 list_for_each_entry(geneve, &gn->geneve_list, next) {
1317 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1318 *tun_collect_md = geneve->cfg.collect_md;
1319 *tun_on_same_port = true;
1320 }
1321 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1322 info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1323 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1324 t = geneve;
1325 }
1326 return t;
1327}
1328
1329static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1330{
1331 return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1332 info->key.ttl || info->key.label || info->key.tp_src ||
1333 memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1334}
1335
1336static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1337 struct ip_tunnel_info *b)
1338{
1339 if (ip_tunnel_info_af(a) == AF_INET)
1340 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1341 else
1342 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1343}
1344
1345static int geneve_configure(struct net *net, struct net_device *dev,
1346 struct netlink_ext_ack *extack,
1347 const struct geneve_config *cfg)
1348{
1349 struct geneve_net *gn = net_generic(net, geneve_net_id);
1350 struct geneve_dev *t, *geneve = netdev_priv(dev);
1351 const struct ip_tunnel_info *info = &cfg->info;
1352 bool tun_collect_md, tun_on_same_port;
1353 int err, encap_len;
1354
1355 if (cfg->collect_md && !is_tnl_info_zero(info)) {
1356 NL_SET_ERR_MSG(extack,
1357 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1358 return -EINVAL;
1359 }
1360
1361 geneve->net = net;
1362 geneve->dev = dev;
1363
1364 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1365 if (t)
1366 return -EBUSY;
1367
1368 /* make enough headroom for basic scenario */
1369 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1370 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1371 encap_len += sizeof(struct iphdr);
1372 dev->max_mtu -= sizeof(struct iphdr);
1373 } else {
1374 encap_len += sizeof(struct ipv6hdr);
1375 dev->max_mtu -= sizeof(struct ipv6hdr);
1376 }
1377 dev->needed_headroom = encap_len + ETH_HLEN;
1378
1379 if (cfg->collect_md) {
1380 if (tun_on_same_port) {
1381 NL_SET_ERR_MSG(extack,
1382 "There can be only one externally controlled device on a destination port");
1383 return -EPERM;
1384 }
1385 } else {
1386 if (tun_collect_md) {
1387 NL_SET_ERR_MSG(extack,
1388 "There already exists an externally controlled device on this destination port");
1389 return -EPERM;
1390 }
1391 }
1392
1393 dst_cache_reset(&geneve->cfg.info.dst_cache);
1394 memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1395
1396 err = register_netdevice(dev);
1397 if (err)
1398 return err;
1399
1400 list_add(&geneve->next, &gn->geneve_list);
1401 return 0;
1402}
1403
1404static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1405{
1406 memset(info, 0, sizeof(*info));
1407 info->key.tp_dst = htons(dst_port);
1408}
1409
1410static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1411 struct netlink_ext_ack *extack,
1412 struct geneve_config *cfg, bool changelink)
1413{
1414 struct ip_tunnel_info *info = &cfg->info;
1415 int attrtype;
1416
1417 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1418 NL_SET_ERR_MSG(extack,
1419 "Cannot specify both IPv4 and IPv6 Remote addresses");
1420 return -EINVAL;
1421 }
1422
1423 if (data[IFLA_GENEVE_REMOTE]) {
1424 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1425 attrtype = IFLA_GENEVE_REMOTE;
1426 goto change_notsup;
1427 }
1428
1429 info->key.u.ipv4.dst =
1430 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1431
1432 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1433 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1434 "Remote IPv4 address cannot be Multicast");
1435 return -EINVAL;
1436 }
1437 }
1438
1439 if (data[IFLA_GENEVE_REMOTE6]) {
1440#if IS_ENABLED(CONFIG_IPV6)
1441 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1442 attrtype = IFLA_GENEVE_REMOTE6;
1443 goto change_notsup;
1444 }
1445
1446 info->mode = IP_TUNNEL_INFO_IPV6;
1447 info->key.u.ipv6.dst =
1448 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1449
1450 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1451 IPV6_ADDR_LINKLOCAL) {
1452 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1453 "Remote IPv6 address cannot be link-local");
1454 return -EINVAL;
1455 }
1456 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1457 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1458 "Remote IPv6 address cannot be Multicast");
1459 return -EINVAL;
1460 }
1461 info->key.tun_flags |= TUNNEL_CSUM;
1462 cfg->use_udp6_rx_checksums = true;
1463#else
1464 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1465 "IPv6 support not enabled in the kernel");
1466 return -EPFNOSUPPORT;
1467#endif
1468 }
1469
1470 if (data[IFLA_GENEVE_ID]) {
1471 __u32 vni;
1472 __u8 tvni[3];
1473 __be64 tunid;
1474
1475 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1476 tvni[0] = (vni & 0x00ff0000) >> 16;
1477 tvni[1] = (vni & 0x0000ff00) >> 8;
1478 tvni[2] = vni & 0x000000ff;
1479
1480 tunid = vni_to_tunnel_id(tvni);
1481 if (changelink && (tunid != info->key.tun_id)) {
1482 attrtype = IFLA_GENEVE_ID;
1483 goto change_notsup;
1484 }
1485 info->key.tun_id = tunid;
1486 }
1487
1488 if (data[IFLA_GENEVE_TTL_INHERIT]) {
1489 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1490 cfg->ttl_inherit = true;
1491 else
1492 cfg->ttl_inherit = false;
1493 } else if (data[IFLA_GENEVE_TTL]) {
1494 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1495 cfg->ttl_inherit = false;
1496 }
1497
1498 if (data[IFLA_GENEVE_TOS])
1499 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1500
1501 if (data[IFLA_GENEVE_DF])
1502 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1503
1504 if (data[IFLA_GENEVE_LABEL]) {
1505 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1506 IPV6_FLOWLABEL_MASK;
1507 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1508 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1509 "Label attribute only applies for IPv6 Geneve devices");
1510 return -EINVAL;
1511 }
1512 }
1513
1514 if (data[IFLA_GENEVE_PORT]) {
1515 if (changelink) {
1516 attrtype = IFLA_GENEVE_PORT;
1517 goto change_notsup;
1518 }
1519 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1520 }
1521
1522 if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1523 if (changelink) {
1524 attrtype = IFLA_GENEVE_COLLECT_METADATA;
1525 goto change_notsup;
1526 }
1527 cfg->collect_md = true;
1528 }
1529
1530 if (data[IFLA_GENEVE_UDP_CSUM]) {
1531 if (changelink) {
1532 attrtype = IFLA_GENEVE_UDP_CSUM;
1533 goto change_notsup;
1534 }
1535 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1536 info->key.tun_flags |= TUNNEL_CSUM;
1537 }
1538
1539 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1540#if IS_ENABLED(CONFIG_IPV6)
1541 if (changelink) {
1542 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1543 goto change_notsup;
1544 }
1545 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1546 info->key.tun_flags &= ~TUNNEL_CSUM;
1547#else
1548 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1549 "IPv6 support not enabled in the kernel");
1550 return -EPFNOSUPPORT;
1551#endif
1552 }
1553
1554 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1555#if IS_ENABLED(CONFIG_IPV6)
1556 if (changelink) {
1557 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1558 goto change_notsup;
1559 }
1560 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1561 cfg->use_udp6_rx_checksums = false;
1562#else
1563 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1564 "IPv6 support not enabled in the kernel");
1565 return -EPFNOSUPPORT;
1566#endif
1567 }
1568
1569 return 0;
1570change_notsup:
1571 NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1572 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1573 return -EOPNOTSUPP;
1574}
1575
1576static void geneve_link_config(struct net_device *dev,
1577 struct ip_tunnel_info *info, struct nlattr *tb[])
1578{
1579 struct geneve_dev *geneve = netdev_priv(dev);
1580 int ldev_mtu = 0;
1581
1582 if (tb[IFLA_MTU]) {
1583 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1584 return;
1585 }
1586
1587 switch (ip_tunnel_info_af(info)) {
1588 case AF_INET: {
1589 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1590 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1591
1592 if (!IS_ERR(rt) && rt->dst.dev) {
1593 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1594 ip_rt_put(rt);
1595 }
1596 break;
1597 }
1598#if IS_ENABLED(CONFIG_IPV6)
1599 case AF_INET6: {
1600 struct rt6_info *rt;
1601
1602 if (!__in6_dev_get(dev))
1603 break;
1604
1605 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1606 NULL, 0);
1607
1608 if (rt && rt->dst.dev)
1609 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1610 ip6_rt_put(rt);
1611 break;
1612 }
1613#endif
1614 }
1615
1616 if (ldev_mtu <= 0)
1617 return;
1618
1619 geneve_change_mtu(dev, ldev_mtu - info->options_len);
1620}
1621
1622static int geneve_newlink(struct net *net, struct net_device *dev,
1623 struct nlattr *tb[], struct nlattr *data[],
1624 struct netlink_ext_ack *extack)
1625{
1626 struct geneve_config cfg = {
1627 .df = GENEVE_DF_UNSET,
1628 .use_udp6_rx_checksums = false,
1629 .ttl_inherit = false,
1630 .collect_md = false,
1631 };
1632 int err;
1633
1634 init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1635 err = geneve_nl2info(tb, data, extack, &cfg, false);
1636 if (err)
1637 return err;
1638
1639 err = geneve_configure(net, dev, extack, &cfg);
1640 if (err)
1641 return err;
1642
1643 geneve_link_config(dev, &cfg.info, tb);
1644
1645 return 0;
1646}
1647
1648/* Quiesces the geneve device data path for both TX and RX.
1649 *
1650 * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1651 * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1652 * to complete for the existing set of in-flight packets to be transmitted,
1653 * then we would have quiesced the transmit data path. All the future packets
1654 * will get dropped until we unquiesce the data path.
1655 *
1656 * On receive geneve dereference the geneve_sock stashed in the socket. So,
1657 * if we set that to NULL under RCU and wait for synchronize_net() to
1658 * complete, then we would have quiesced the receive data path.
1659 */
1660static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1661 struct geneve_sock **gs6)
1662{
1663 *gs4 = rtnl_dereference(geneve->sock4);
1664 rcu_assign_pointer(geneve->sock4, NULL);
1665 if (*gs4)
1666 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1667#if IS_ENABLED(CONFIG_IPV6)
1668 *gs6 = rtnl_dereference(geneve->sock6);
1669 rcu_assign_pointer(geneve->sock6, NULL);
1670 if (*gs6)
1671 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1672#else
1673 *gs6 = NULL;
1674#endif
1675 synchronize_net();
1676}
1677
1678/* Resumes the geneve device data path for both TX and RX. */
1679static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1680 struct geneve_sock __maybe_unused *gs6)
1681{
1682 rcu_assign_pointer(geneve->sock4, gs4);
1683 if (gs4)
1684 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1685#if IS_ENABLED(CONFIG_IPV6)
1686 rcu_assign_pointer(geneve->sock6, gs6);
1687 if (gs6)
1688 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1689#endif
1690 synchronize_net();
1691}
1692
1693static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1694 struct nlattr *data[],
1695 struct netlink_ext_ack *extack)
1696{
1697 struct geneve_dev *geneve = netdev_priv(dev);
1698 struct geneve_sock *gs4, *gs6;
1699 struct geneve_config cfg;
1700 int err;
1701
1702 /* If the geneve device is configured for metadata (or externally
1703 * controlled, for example, OVS), then nothing can be changed.
1704 */
1705 if (geneve->cfg.collect_md)
1706 return -EOPNOTSUPP;
1707
1708 /* Start with the existing info. */
1709 memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1710 err = geneve_nl2info(tb, data, extack, &cfg, true);
1711 if (err)
1712 return err;
1713
1714 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1715 dst_cache_reset(&cfg.info.dst_cache);
1716 geneve_link_config(dev, &cfg.info, tb);
1717 }
1718
1719 geneve_quiesce(geneve, &gs4, &gs6);
1720 memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1721 geneve_unquiesce(geneve, gs4, gs6);
1722
1723 return 0;
1724}
1725
1726static void geneve_dellink(struct net_device *dev, struct list_head *head)
1727{
1728 struct geneve_dev *geneve = netdev_priv(dev);
1729
1730 list_del(&geneve->next);
1731 unregister_netdevice_queue(dev, head);
1732}
1733
1734static size_t geneve_get_size(const struct net_device *dev)
1735{
1736 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1737 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1738 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1739 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1740 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */
1741 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1742 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1743 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1744 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1745 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1746 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1747 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1748 0;
1749}
1750
1751static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1752{
1753 struct geneve_dev *geneve = netdev_priv(dev);
1754 struct ip_tunnel_info *info = &geneve->cfg.info;
1755 bool ttl_inherit = geneve->cfg.ttl_inherit;
1756 bool metadata = geneve->cfg.collect_md;
1757 __u8 tmp_vni[3];
1758 __u32 vni;
1759
1760 tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1761 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1762 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1763 goto nla_put_failure;
1764
1765 if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1766 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1767 info->key.u.ipv4.dst))
1768 goto nla_put_failure;
1769 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1770 !!(info->key.tun_flags & TUNNEL_CSUM)))
1771 goto nla_put_failure;
1772
1773#if IS_ENABLED(CONFIG_IPV6)
1774 } else if (!metadata) {
1775 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1776 &info->key.u.ipv6.dst))
1777 goto nla_put_failure;
1778 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1779 !(info->key.tun_flags & TUNNEL_CSUM)))
1780 goto nla_put_failure;
1781#endif
1782 }
1783
1784 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1785 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1786 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1787 goto nla_put_failure;
1788
1789 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1790 goto nla_put_failure;
1791
1792 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1793 goto nla_put_failure;
1794
1795 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1796 goto nla_put_failure;
1797
1798#if IS_ENABLED(CONFIG_IPV6)
1799 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1800 !geneve->cfg.use_udp6_rx_checksums))
1801 goto nla_put_failure;
1802#endif
1803
1804 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1805 goto nla_put_failure;
1806
1807 return 0;
1808
1809nla_put_failure:
1810 return -EMSGSIZE;
1811}
1812
1813static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1814 .kind = "geneve",
1815 .maxtype = IFLA_GENEVE_MAX,
1816 .policy = geneve_policy,
1817 .priv_size = sizeof(struct geneve_dev),
1818 .setup = geneve_setup,
1819 .validate = geneve_validate,
1820 .newlink = geneve_newlink,
1821 .changelink = geneve_changelink,
1822 .dellink = geneve_dellink,
1823 .get_size = geneve_get_size,
1824 .fill_info = geneve_fill_info,
1825};
1826
1827struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1828 u8 name_assign_type, u16 dst_port)
1829{
1830 struct nlattr *tb[IFLA_MAX + 1];
1831 struct net_device *dev;
1832 LIST_HEAD(list_kill);
1833 int err;
1834 struct geneve_config cfg = {
1835 .df = GENEVE_DF_UNSET,
1836 .use_udp6_rx_checksums = true,
1837 .ttl_inherit = false,
1838 .collect_md = true,
1839 };
1840
1841 memset(tb, 0, sizeof(tb));
1842 dev = rtnl_create_link(net, name, name_assign_type,
1843 &geneve_link_ops, tb, NULL);
1844 if (IS_ERR(dev))
1845 return dev;
1846
1847 init_tnl_info(&cfg.info, dst_port);
1848 err = geneve_configure(net, dev, NULL, &cfg);
1849 if (err) {
1850 free_netdev(dev);
1851 return ERR_PTR(err);
1852 }
1853
1854 /* openvswitch users expect packet sizes to be unrestricted,
1855 * so set the largest MTU we can.
1856 */
1857 err = geneve_change_mtu(dev, IP_MAX_MTU);
1858 if (err)
1859 goto err;
1860
1861 err = rtnl_configure_link(dev, NULL);
1862 if (err < 0)
1863 goto err;
1864
1865 return dev;
1866err:
1867 geneve_dellink(dev, &list_kill);
1868 unregister_netdevice_many(&list_kill);
1869 return ERR_PTR(err);
1870}
1871EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1872
1873static int geneve_netdevice_event(struct notifier_block *unused,
1874 unsigned long event, void *ptr)
1875{
1876 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1877
1878 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1879 geneve_offload_rx_ports(dev, true);
1880 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1881 geneve_offload_rx_ports(dev, false);
1882
1883 return NOTIFY_DONE;
1884}
1885
1886static struct notifier_block geneve_notifier_block __read_mostly = {
1887 .notifier_call = geneve_netdevice_event,
1888};
1889
1890static __net_init int geneve_init_net(struct net *net)
1891{
1892 struct geneve_net *gn = net_generic(net, geneve_net_id);
1893
1894 INIT_LIST_HEAD(&gn->geneve_list);
1895 INIT_LIST_HEAD(&gn->sock_list);
1896 return 0;
1897}
1898
1899static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1900{
1901 struct geneve_net *gn = net_generic(net, geneve_net_id);
1902 struct geneve_dev *geneve, *next;
1903 struct net_device *dev, *aux;
1904
1905 /* gather any geneve devices that were moved into this ns */
1906 for_each_netdev_safe(net, dev, aux)
1907 if (dev->rtnl_link_ops == &geneve_link_ops)
1908 unregister_netdevice_queue(dev, head);
1909
1910 /* now gather any other geneve devices that were created in this ns */
1911 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1912 /* If geneve->dev is in the same netns, it was already added
1913 * to the list by the previous loop.
1914 */
1915 if (!net_eq(dev_net(geneve->dev), net))
1916 unregister_netdevice_queue(geneve->dev, head);
1917 }
1918}
1919
1920static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1921{
1922 struct net *net;
1923 LIST_HEAD(list);
1924
1925 rtnl_lock();
1926 list_for_each_entry(net, net_list, exit_list)
1927 geneve_destroy_tunnels(net, &list);
1928
1929 /* unregister the devices gathered above */
1930 unregister_netdevice_many(&list);
1931 rtnl_unlock();
1932
1933 list_for_each_entry(net, net_list, exit_list) {
1934 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1935
1936 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1937 }
1938}
1939
1940static struct pernet_operations geneve_net_ops = {
1941 .init = geneve_init_net,
1942 .exit_batch = geneve_exit_batch_net,
1943 .id = &geneve_net_id,
1944 .size = sizeof(struct geneve_net),
1945};
1946
1947static int __init geneve_init_module(void)
1948{
1949 int rc;
1950
1951 rc = register_pernet_subsys(&geneve_net_ops);
1952 if (rc)
1953 goto out1;
1954
1955 rc = register_netdevice_notifier(&geneve_notifier_block);
1956 if (rc)
1957 goto out2;
1958
1959 rc = rtnl_link_register(&geneve_link_ops);
1960 if (rc)
1961 goto out3;
1962
1963 return 0;
1964out3:
1965 unregister_netdevice_notifier(&geneve_notifier_block);
1966out2:
1967 unregister_pernet_subsys(&geneve_net_ops);
1968out1:
1969 return rc;
1970}
1971late_initcall(geneve_init_module);
1972
1973static void __exit geneve_cleanup_module(void)
1974{
1975 rtnl_link_unregister(&geneve_link_ops);
1976 unregister_netdevice_notifier(&geneve_notifier_block);
1977 unregister_pernet_subsys(&geneve_net_ops);
1978}
1979module_exit(geneve_cleanup_module);
1980
1981MODULE_LICENSE("GPL");
1982MODULE_VERSION(GENEVE_NETDEV_VER);
1983MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1984MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1985MODULE_ALIAS_RTNL_LINK("geneve");