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1/*
2 * GENEVE: Generic Network Virtualization Encapsulation
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
17#include <linux/hash.h>
18#include <net/dst_metadata.h>
19#include <net/gro_cells.h>
20#include <net/rtnetlink.h>
21#include <net/geneve.h>
22#include <net/protocol.h>
23
24#define GENEVE_NETDEV_VER "0.6"
25
26#define GENEVE_UDP_PORT 6081
27
28#define GENEVE_N_VID (1u << 24)
29#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
30
31#define VNI_HASH_BITS 10
32#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
33
34static bool log_ecn_error = true;
35module_param(log_ecn_error, bool, 0644);
36MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
37
38#define GENEVE_VER 0
39#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
40
41/* per-network namespace private data for this module */
42struct geneve_net {
43 struct list_head geneve_list;
44 struct list_head sock_list;
45};
46
47static int geneve_net_id;
48
49union geneve_addr {
50 struct sockaddr_in sin;
51 struct sockaddr_in6 sin6;
52 struct sockaddr sa;
53};
54
55static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
56
57/* Pseudo network device */
58struct geneve_dev {
59 struct hlist_node hlist; /* vni hash table */
60 struct net *net; /* netns for packet i/o */
61 struct net_device *dev; /* netdev for geneve tunnel */
62 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
63#if IS_ENABLED(CONFIG_IPV6)
64 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
65#endif
66 u8 vni[3]; /* virtual network ID for tunnel */
67 u8 ttl; /* TTL override */
68 u8 tos; /* TOS override */
69 union geneve_addr remote; /* IP address for link partner */
70 struct list_head next; /* geneve's per namespace list */
71 __be32 label; /* IPv6 flowlabel override */
72 __be16 dst_port;
73 bool collect_md;
74 struct gro_cells gro_cells;
75 u32 flags;
76 struct dst_cache dst_cache;
77};
78
79/* Geneve device flags */
80#define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
81#define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
82#define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
83
84struct geneve_sock {
85 bool collect_md;
86 struct list_head list;
87 struct socket *sock;
88 struct rcu_head rcu;
89 int refcnt;
90 struct udp_offload udp_offloads;
91 struct hlist_head vni_list[VNI_HASH_SIZE];
92 u32 flags;
93};
94
95static inline __u32 geneve_net_vni_hash(u8 vni[3])
96{
97 __u32 vnid;
98
99 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
100 return hash_32(vnid, VNI_HASH_BITS);
101}
102
103static __be64 vni_to_tunnel_id(const __u8 *vni)
104{
105#ifdef __BIG_ENDIAN
106 return (vni[0] << 16) | (vni[1] << 8) | vni[2];
107#else
108 return (__force __be64)(((__force u64)vni[0] << 40) |
109 ((__force u64)vni[1] << 48) |
110 ((__force u64)vni[2] << 56));
111#endif
112}
113
114static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
115{
116 return gs->sock->sk->sk_family;
117}
118
119static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
120 __be32 addr, u8 vni[])
121{
122 struct hlist_head *vni_list_head;
123 struct geneve_dev *geneve;
124 __u32 hash;
125
126 /* Find the device for this VNI */
127 hash = geneve_net_vni_hash(vni);
128 vni_list_head = &gs->vni_list[hash];
129 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
130 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
131 addr == geneve->remote.sin.sin_addr.s_addr)
132 return geneve;
133 }
134 return NULL;
135}
136
137#if IS_ENABLED(CONFIG_IPV6)
138static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
139 struct in6_addr addr6, u8 vni[])
140{
141 struct hlist_head *vni_list_head;
142 struct geneve_dev *geneve;
143 __u32 hash;
144
145 /* Find the device for this VNI */
146 hash = geneve_net_vni_hash(vni);
147 vni_list_head = &gs->vni_list[hash];
148 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
149 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
150 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
151 return geneve;
152 }
153 return NULL;
154}
155#endif
156
157static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
158{
159 return (struct genevehdr *)(udp_hdr(skb) + 1);
160}
161
162static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
163 struct sk_buff *skb)
164{
165 u8 *vni;
166 __be32 addr;
167 static u8 zero_vni[3];
168#if IS_ENABLED(CONFIG_IPV6)
169 static struct in6_addr zero_addr6;
170#endif
171
172 if (geneve_get_sk_family(gs) == AF_INET) {
173 struct iphdr *iph;
174
175 iph = ip_hdr(skb); /* outer IP header... */
176
177 if (gs->collect_md) {
178 vni = zero_vni;
179 addr = 0;
180 } else {
181 vni = geneve_hdr(skb)->vni;
182 addr = iph->saddr;
183 }
184
185 return geneve_lookup(gs, addr, vni);
186#if IS_ENABLED(CONFIG_IPV6)
187 } else if (geneve_get_sk_family(gs) == AF_INET6) {
188 struct ipv6hdr *ip6h;
189 struct in6_addr addr6;
190
191 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
192
193 if (gs->collect_md) {
194 vni = zero_vni;
195 addr6 = zero_addr6;
196 } else {
197 vni = geneve_hdr(skb)->vni;
198 addr6 = ip6h->saddr;
199 }
200
201 return geneve6_lookup(gs, addr6, vni);
202#endif
203 }
204 return NULL;
205}
206
207/* geneve receive/decap routine */
208static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
209 struct sk_buff *skb)
210{
211 struct genevehdr *gnvh = geneve_hdr(skb);
212 struct metadata_dst *tun_dst = NULL;
213 struct pcpu_sw_netstats *stats;
214 int err = 0;
215 void *oiph;
216
217 if (ip_tunnel_collect_metadata() || gs->collect_md) {
218 __be16 flags;
219
220 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
221 (gnvh->oam ? TUNNEL_OAM : 0) |
222 (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
223
224 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
225 vni_to_tunnel_id(gnvh->vni),
226 gnvh->opt_len * 4);
227 if (!tun_dst)
228 goto drop;
229 /* Update tunnel dst according to Geneve options. */
230 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
231 gnvh->options, gnvh->opt_len * 4);
232 } else {
233 /* Drop packets w/ critical options,
234 * since we don't support any...
235 */
236 if (gnvh->critical)
237 goto drop;
238 }
239
240 skb_reset_mac_header(skb);
241 skb->protocol = eth_type_trans(skb, geneve->dev);
242 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
243
244 if (tun_dst)
245 skb_dst_set(skb, &tun_dst->dst);
246
247 /* Ignore packet loops (and multicast echo) */
248 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
249 goto drop;
250
251 oiph = skb_network_header(skb);
252 skb_reset_network_header(skb);
253
254 if (geneve_get_sk_family(gs) == AF_INET)
255 err = IP_ECN_decapsulate(oiph, skb);
256#if IS_ENABLED(CONFIG_IPV6)
257 else
258 err = IP6_ECN_decapsulate(oiph, skb);
259#endif
260
261 if (unlikely(err)) {
262 if (log_ecn_error) {
263 if (geneve_get_sk_family(gs) == AF_INET)
264 net_info_ratelimited("non-ECT from %pI4 "
265 "with TOS=%#x\n",
266 &((struct iphdr *)oiph)->saddr,
267 ((struct iphdr *)oiph)->tos);
268#if IS_ENABLED(CONFIG_IPV6)
269 else
270 net_info_ratelimited("non-ECT from %pI6\n",
271 &((struct ipv6hdr *)oiph)->saddr);
272#endif
273 }
274 if (err > 1) {
275 ++geneve->dev->stats.rx_frame_errors;
276 ++geneve->dev->stats.rx_errors;
277 goto drop;
278 }
279 }
280
281 stats = this_cpu_ptr(geneve->dev->tstats);
282 u64_stats_update_begin(&stats->syncp);
283 stats->rx_packets++;
284 stats->rx_bytes += skb->len;
285 u64_stats_update_end(&stats->syncp);
286
287 gro_cells_receive(&geneve->gro_cells, skb);
288 return;
289drop:
290 /* Consume bad packet */
291 kfree_skb(skb);
292}
293
294/* Setup stats when device is created */
295static int geneve_init(struct net_device *dev)
296{
297 struct geneve_dev *geneve = netdev_priv(dev);
298 int err;
299
300 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
301 if (!dev->tstats)
302 return -ENOMEM;
303
304 err = gro_cells_init(&geneve->gro_cells, dev);
305 if (err) {
306 free_percpu(dev->tstats);
307 return err;
308 }
309
310 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
311 if (err) {
312 free_percpu(dev->tstats);
313 gro_cells_destroy(&geneve->gro_cells);
314 return err;
315 }
316
317 return 0;
318}
319
320static void geneve_uninit(struct net_device *dev)
321{
322 struct geneve_dev *geneve = netdev_priv(dev);
323
324 dst_cache_destroy(&geneve->dst_cache);
325 gro_cells_destroy(&geneve->gro_cells);
326 free_percpu(dev->tstats);
327}
328
329/* Callback from net/ipv4/udp.c to receive packets */
330static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
331{
332 struct genevehdr *geneveh;
333 struct geneve_dev *geneve;
334 struct geneve_sock *gs;
335 int opts_len;
336
337 /* Need Geneve and inner Ethernet header to be present */
338 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
339 goto error;
340
341 /* Return packets with reserved bits set */
342 geneveh = geneve_hdr(skb);
343 if (unlikely(geneveh->ver != GENEVE_VER))
344 goto error;
345
346 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
347 goto error;
348
349 gs = rcu_dereference_sk_user_data(sk);
350 if (!gs)
351 goto drop;
352
353 geneve = geneve_lookup_skb(gs, skb);
354 if (!geneve)
355 goto drop;
356
357 opts_len = geneveh->opt_len * 4;
358 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
359 htons(ETH_P_TEB),
360 !net_eq(geneve->net, dev_net(geneve->dev))))
361 goto drop;
362
363 geneve_rx(geneve, gs, skb);
364 return 0;
365
366drop:
367 /* Consume bad packet */
368 kfree_skb(skb);
369 return 0;
370
371error:
372 /* Let the UDP layer deal with the skb */
373 return 1;
374}
375
376static struct socket *geneve_create_sock(struct net *net, bool ipv6,
377 __be16 port, u32 flags)
378{
379 struct socket *sock;
380 struct udp_port_cfg udp_conf;
381 int err;
382
383 memset(&udp_conf, 0, sizeof(udp_conf));
384
385 if (ipv6) {
386 udp_conf.family = AF_INET6;
387 udp_conf.ipv6_v6only = 1;
388 udp_conf.use_udp6_rx_checksums =
389 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
390 } else {
391 udp_conf.family = AF_INET;
392 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
393 }
394
395 udp_conf.local_udp_port = port;
396
397 /* Open UDP socket */
398 err = udp_sock_create(net, &udp_conf, &sock);
399 if (err < 0)
400 return ERR_PTR(err);
401
402 return sock;
403}
404
405static void geneve_notify_add_rx_port(struct geneve_sock *gs)
406{
407 struct net_device *dev;
408 struct sock *sk = gs->sock->sk;
409 struct net *net = sock_net(sk);
410 sa_family_t sa_family = geneve_get_sk_family(gs);
411 __be16 port = inet_sk(sk)->inet_sport;
412 int err;
413
414 if (sa_family == AF_INET) {
415 err = udp_add_offload(sock_net(sk), &gs->udp_offloads);
416 if (err)
417 pr_warn("geneve: udp_add_offload failed with status %d\n",
418 err);
419 }
420
421 rcu_read_lock();
422 for_each_netdev_rcu(net, dev) {
423 if (dev->netdev_ops->ndo_add_geneve_port)
424 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
425 port);
426 }
427 rcu_read_unlock();
428}
429
430static int geneve_hlen(struct genevehdr *gh)
431{
432 return sizeof(*gh) + gh->opt_len * 4;
433}
434
435static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
436 struct sk_buff *skb,
437 struct udp_offload *uoff)
438{
439 struct sk_buff *p, **pp = NULL;
440 struct genevehdr *gh, *gh2;
441 unsigned int hlen, gh_len, off_gnv;
442 const struct packet_offload *ptype;
443 __be16 type;
444 int flush = 1;
445
446 off_gnv = skb_gro_offset(skb);
447 hlen = off_gnv + sizeof(*gh);
448 gh = skb_gro_header_fast(skb, off_gnv);
449 if (skb_gro_header_hard(skb, hlen)) {
450 gh = skb_gro_header_slow(skb, hlen, off_gnv);
451 if (unlikely(!gh))
452 goto out;
453 }
454
455 if (gh->ver != GENEVE_VER || gh->oam)
456 goto out;
457 gh_len = geneve_hlen(gh);
458
459 hlen = off_gnv + gh_len;
460 if (skb_gro_header_hard(skb, hlen)) {
461 gh = skb_gro_header_slow(skb, hlen, off_gnv);
462 if (unlikely(!gh))
463 goto out;
464 }
465
466 for (p = *head; p; p = p->next) {
467 if (!NAPI_GRO_CB(p)->same_flow)
468 continue;
469
470 gh2 = (struct genevehdr *)(p->data + off_gnv);
471 if (gh->opt_len != gh2->opt_len ||
472 memcmp(gh, gh2, gh_len)) {
473 NAPI_GRO_CB(p)->same_flow = 0;
474 continue;
475 }
476 }
477
478 type = gh->proto_type;
479
480 rcu_read_lock();
481 ptype = gro_find_receive_by_type(type);
482 if (!ptype)
483 goto out_unlock;
484
485 skb_gro_pull(skb, gh_len);
486 skb_gro_postpull_rcsum(skb, gh, gh_len);
487 pp = ptype->callbacks.gro_receive(head, skb);
488 flush = 0;
489
490out_unlock:
491 rcu_read_unlock();
492out:
493 NAPI_GRO_CB(skb)->flush |= flush;
494
495 return pp;
496}
497
498static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
499 struct udp_offload *uoff)
500{
501 struct genevehdr *gh;
502 struct packet_offload *ptype;
503 __be16 type;
504 int gh_len;
505 int err = -ENOSYS;
506
507 gh = (struct genevehdr *)(skb->data + nhoff);
508 gh_len = geneve_hlen(gh);
509 type = gh->proto_type;
510
511 rcu_read_lock();
512 ptype = gro_find_complete_by_type(type);
513 if (ptype)
514 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
515
516 rcu_read_unlock();
517
518 skb_set_inner_mac_header(skb, nhoff + gh_len);
519
520 return err;
521}
522
523/* Create new listen socket if needed */
524static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
525 bool ipv6, u32 flags)
526{
527 struct geneve_net *gn = net_generic(net, geneve_net_id);
528 struct geneve_sock *gs;
529 struct socket *sock;
530 struct udp_tunnel_sock_cfg tunnel_cfg;
531 int h;
532
533 gs = kzalloc(sizeof(*gs), GFP_KERNEL);
534 if (!gs)
535 return ERR_PTR(-ENOMEM);
536
537 sock = geneve_create_sock(net, ipv6, port, flags);
538 if (IS_ERR(sock)) {
539 kfree(gs);
540 return ERR_CAST(sock);
541 }
542
543 gs->sock = sock;
544 gs->refcnt = 1;
545 for (h = 0; h < VNI_HASH_SIZE; ++h)
546 INIT_HLIST_HEAD(&gs->vni_list[h]);
547
548 /* Initialize the geneve udp offloads structure */
549 gs->udp_offloads.port = port;
550 gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
551 gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
552 geneve_notify_add_rx_port(gs);
553
554 /* Mark socket as an encapsulation socket */
555 tunnel_cfg.sk_user_data = gs;
556 tunnel_cfg.encap_type = 1;
557 tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
558 tunnel_cfg.encap_destroy = NULL;
559 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
560 list_add(&gs->list, &gn->sock_list);
561 return gs;
562}
563
564static void geneve_notify_del_rx_port(struct geneve_sock *gs)
565{
566 struct net_device *dev;
567 struct sock *sk = gs->sock->sk;
568 struct net *net = sock_net(sk);
569 sa_family_t sa_family = geneve_get_sk_family(gs);
570 __be16 port = inet_sk(sk)->inet_sport;
571
572 rcu_read_lock();
573 for_each_netdev_rcu(net, dev) {
574 if (dev->netdev_ops->ndo_del_geneve_port)
575 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
576 port);
577 }
578
579 rcu_read_unlock();
580
581 if (sa_family == AF_INET)
582 udp_del_offload(&gs->udp_offloads);
583}
584
585static void __geneve_sock_release(struct geneve_sock *gs)
586{
587 if (!gs || --gs->refcnt)
588 return;
589
590 list_del(&gs->list);
591 geneve_notify_del_rx_port(gs);
592 udp_tunnel_sock_release(gs->sock);
593 kfree_rcu(gs, rcu);
594}
595
596static void geneve_sock_release(struct geneve_dev *geneve)
597{
598 __geneve_sock_release(geneve->sock4);
599#if IS_ENABLED(CONFIG_IPV6)
600 __geneve_sock_release(geneve->sock6);
601#endif
602}
603
604static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
605 sa_family_t family,
606 __be16 dst_port)
607{
608 struct geneve_sock *gs;
609
610 list_for_each_entry(gs, &gn->sock_list, list) {
611 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
612 geneve_get_sk_family(gs) == family) {
613 return gs;
614 }
615 }
616 return NULL;
617}
618
619static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
620{
621 struct net *net = geneve->net;
622 struct geneve_net *gn = net_generic(net, geneve_net_id);
623 struct geneve_sock *gs;
624 __u32 hash;
625
626 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
627 if (gs) {
628 gs->refcnt++;
629 goto out;
630 }
631
632 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
633 if (IS_ERR(gs))
634 return PTR_ERR(gs);
635
636out:
637 gs->collect_md = geneve->collect_md;
638 gs->flags = geneve->flags;
639#if IS_ENABLED(CONFIG_IPV6)
640 if (ipv6)
641 geneve->sock6 = gs;
642 else
643#endif
644 geneve->sock4 = gs;
645
646 hash = geneve_net_vni_hash(geneve->vni);
647 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
648 return 0;
649}
650
651static int geneve_open(struct net_device *dev)
652{
653 struct geneve_dev *geneve = netdev_priv(dev);
654 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
655 bool metadata = geneve->collect_md;
656 int ret = 0;
657
658 geneve->sock4 = NULL;
659#if IS_ENABLED(CONFIG_IPV6)
660 geneve->sock6 = NULL;
661 if (ipv6 || metadata)
662 ret = geneve_sock_add(geneve, true);
663#endif
664 if (!ret && (!ipv6 || metadata))
665 ret = geneve_sock_add(geneve, false);
666 if (ret < 0)
667 geneve_sock_release(geneve);
668
669 return ret;
670}
671
672static int geneve_stop(struct net_device *dev)
673{
674 struct geneve_dev *geneve = netdev_priv(dev);
675
676 if (!hlist_unhashed(&geneve->hlist))
677 hlist_del_rcu(&geneve->hlist);
678 geneve_sock_release(geneve);
679 return 0;
680}
681
682static void geneve_build_header(struct genevehdr *geneveh,
683 __be16 tun_flags, u8 vni[3],
684 u8 options_len, u8 *options)
685{
686 geneveh->ver = GENEVE_VER;
687 geneveh->opt_len = options_len / 4;
688 geneveh->oam = !!(tun_flags & TUNNEL_OAM);
689 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
690 geneveh->rsvd1 = 0;
691 memcpy(geneveh->vni, vni, 3);
692 geneveh->proto_type = htons(ETH_P_TEB);
693 geneveh->rsvd2 = 0;
694
695 memcpy(geneveh->options, options, options_len);
696}
697
698static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
699 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
700 u32 flags, bool xnet)
701{
702 struct genevehdr *gnvh;
703 int min_headroom;
704 int err;
705 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
706
707 skb_scrub_packet(skb, xnet);
708
709 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
710 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
711 err = skb_cow_head(skb, min_headroom);
712 if (unlikely(err)) {
713 kfree_skb(skb);
714 goto free_rt;
715 }
716
717 skb = udp_tunnel_handle_offloads(skb, udp_sum);
718 if (IS_ERR(skb)) {
719 err = PTR_ERR(skb);
720 goto free_rt;
721 }
722
723 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
724 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
725
726 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
727 return 0;
728
729free_rt:
730 ip_rt_put(rt);
731 return err;
732}
733
734#if IS_ENABLED(CONFIG_IPV6)
735static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
736 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
737 u32 flags, bool xnet)
738{
739 struct genevehdr *gnvh;
740 int min_headroom;
741 int err;
742 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
743
744 skb_scrub_packet(skb, xnet);
745
746 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
747 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
748 err = skb_cow_head(skb, min_headroom);
749 if (unlikely(err)) {
750 kfree_skb(skb);
751 goto free_dst;
752 }
753
754 skb = udp_tunnel_handle_offloads(skb, udp_sum);
755 if (IS_ERR(skb)) {
756 err = PTR_ERR(skb);
757 goto free_dst;
758 }
759
760 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
761 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
762
763 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
764 return 0;
765
766free_dst:
767 dst_release(dst);
768 return err;
769}
770#endif
771
772static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
773 struct net_device *dev,
774 struct flowi4 *fl4,
775 struct ip_tunnel_info *info)
776{
777 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
778 struct geneve_dev *geneve = netdev_priv(dev);
779 struct dst_cache *dst_cache;
780 struct rtable *rt = NULL;
781 __u8 tos;
782
783 memset(fl4, 0, sizeof(*fl4));
784 fl4->flowi4_mark = skb->mark;
785 fl4->flowi4_proto = IPPROTO_UDP;
786
787 if (info) {
788 fl4->daddr = info->key.u.ipv4.dst;
789 fl4->saddr = info->key.u.ipv4.src;
790 fl4->flowi4_tos = RT_TOS(info->key.tos);
791 dst_cache = &info->dst_cache;
792 } else {
793 tos = geneve->tos;
794 if (tos == 1) {
795 const struct iphdr *iip = ip_hdr(skb);
796
797 tos = ip_tunnel_get_dsfield(iip, skb);
798 use_cache = false;
799 }
800
801 fl4->flowi4_tos = RT_TOS(tos);
802 fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
803 dst_cache = &geneve->dst_cache;
804 }
805
806 if (use_cache) {
807 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
808 if (rt)
809 return rt;
810 }
811
812 rt = ip_route_output_key(geneve->net, fl4);
813 if (IS_ERR(rt)) {
814 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
815 return ERR_PTR(-ENETUNREACH);
816 }
817 if (rt->dst.dev == dev) { /* is this necessary? */
818 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
819 ip_rt_put(rt);
820 return ERR_PTR(-ELOOP);
821 }
822 if (use_cache)
823 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
824 return rt;
825}
826
827#if IS_ENABLED(CONFIG_IPV6)
828static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
829 struct net_device *dev,
830 struct flowi6 *fl6,
831 struct ip_tunnel_info *info)
832{
833 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
834 struct geneve_dev *geneve = netdev_priv(dev);
835 struct geneve_sock *gs6 = geneve->sock6;
836 struct dst_entry *dst = NULL;
837 struct dst_cache *dst_cache;
838 __u8 prio;
839
840 memset(fl6, 0, sizeof(*fl6));
841 fl6->flowi6_mark = skb->mark;
842 fl6->flowi6_proto = IPPROTO_UDP;
843
844 if (info) {
845 fl6->daddr = info->key.u.ipv6.dst;
846 fl6->saddr = info->key.u.ipv6.src;
847 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
848 info->key.label);
849 dst_cache = &info->dst_cache;
850 } else {
851 prio = geneve->tos;
852 if (prio == 1) {
853 const struct iphdr *iip = ip_hdr(skb);
854
855 prio = ip_tunnel_get_dsfield(iip, skb);
856 use_cache = false;
857 }
858
859 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
860 geneve->label);
861 fl6->daddr = geneve->remote.sin6.sin6_addr;
862 dst_cache = &geneve->dst_cache;
863 }
864
865 if (use_cache) {
866 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
867 if (dst)
868 return dst;
869 }
870
871 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
872 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
873 return ERR_PTR(-ENETUNREACH);
874 }
875 if (dst->dev == dev) { /* is this necessary? */
876 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
877 dst_release(dst);
878 return ERR_PTR(-ELOOP);
879 }
880
881 if (use_cache)
882 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
883 return dst;
884}
885#endif
886
887/* Convert 64 bit tunnel ID to 24 bit VNI. */
888static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
889{
890#ifdef __BIG_ENDIAN
891 vni[0] = (__force __u8)(tun_id >> 16);
892 vni[1] = (__force __u8)(tun_id >> 8);
893 vni[2] = (__force __u8)tun_id;
894#else
895 vni[0] = (__force __u8)((__force u64)tun_id >> 40);
896 vni[1] = (__force __u8)((__force u64)tun_id >> 48);
897 vni[2] = (__force __u8)((__force u64)tun_id >> 56);
898#endif
899}
900
901static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
902 struct ip_tunnel_info *info)
903{
904 struct geneve_dev *geneve = netdev_priv(dev);
905 struct geneve_sock *gs4 = geneve->sock4;
906 struct rtable *rt = NULL;
907 const struct iphdr *iip; /* interior IP header */
908 int err = -EINVAL;
909 struct flowi4 fl4;
910 __u8 tos, ttl;
911 __be16 sport;
912 __be16 df;
913 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
914 u32 flags = geneve->flags;
915
916 if (geneve->collect_md) {
917 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
918 netdev_dbg(dev, "no tunnel metadata\n");
919 goto tx_error;
920 }
921 if (info && ip_tunnel_info_af(info) != AF_INET)
922 goto tx_error;
923 }
924
925 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
926 if (IS_ERR(rt)) {
927 err = PTR_ERR(rt);
928 goto tx_error;
929 }
930
931 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
932 skb_reset_mac_header(skb);
933
934 iip = ip_hdr(skb);
935
936 if (info) {
937 const struct ip_tunnel_key *key = &info->key;
938 u8 *opts = NULL;
939 u8 vni[3];
940
941 tunnel_id_to_vni(key->tun_id, vni);
942 if (info->options_len)
943 opts = ip_tunnel_info_opts(info);
944
945 if (key->tun_flags & TUNNEL_CSUM)
946 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX;
947 else
948 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
949
950 err = geneve_build_skb(rt, skb, key->tun_flags, vni,
951 info->options_len, opts, flags, xnet);
952 if (unlikely(err))
953 goto err;
954
955 tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
956 ttl = key->ttl;
957 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
958 } else {
959 err = geneve_build_skb(rt, skb, 0, geneve->vni,
960 0, NULL, flags, xnet);
961 if (unlikely(err))
962 goto err;
963
964 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
965 ttl = geneve->ttl;
966 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
967 ttl = 1;
968 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
969 df = 0;
970 }
971 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
972 tos, ttl, df, sport, geneve->dst_port,
973 !net_eq(geneve->net, dev_net(geneve->dev)),
974 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX));
975
976 return NETDEV_TX_OK;
977
978tx_error:
979 dev_kfree_skb(skb);
980err:
981 if (err == -ELOOP)
982 dev->stats.collisions++;
983 else if (err == -ENETUNREACH)
984 dev->stats.tx_carrier_errors++;
985 else
986 dev->stats.tx_errors++;
987 return NETDEV_TX_OK;
988}
989
990#if IS_ENABLED(CONFIG_IPV6)
991static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
992 struct ip_tunnel_info *info)
993{
994 struct geneve_dev *geneve = netdev_priv(dev);
995 struct geneve_sock *gs6 = geneve->sock6;
996 struct dst_entry *dst = NULL;
997 const struct iphdr *iip; /* interior IP header */
998 int err = -EINVAL;
999 struct flowi6 fl6;
1000 __u8 prio, ttl;
1001 __be16 sport;
1002 __be32 label;
1003 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
1004 u32 flags = geneve->flags;
1005
1006 if (geneve->collect_md) {
1007 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1008 netdev_dbg(dev, "no tunnel metadata\n");
1009 goto tx_error;
1010 }
1011 }
1012
1013 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1014 if (IS_ERR(dst)) {
1015 err = PTR_ERR(dst);
1016 goto tx_error;
1017 }
1018
1019 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1020 skb_reset_mac_header(skb);
1021
1022 iip = ip_hdr(skb);
1023
1024 if (info) {
1025 const struct ip_tunnel_key *key = &info->key;
1026 u8 *opts = NULL;
1027 u8 vni[3];
1028
1029 tunnel_id_to_vni(key->tun_id, vni);
1030 if (info->options_len)
1031 opts = ip_tunnel_info_opts(info);
1032
1033 if (key->tun_flags & TUNNEL_CSUM)
1034 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX;
1035 else
1036 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1037
1038 err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
1039 info->options_len, opts,
1040 flags, xnet);
1041 if (unlikely(err))
1042 goto err;
1043
1044 prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
1045 ttl = key->ttl;
1046 label = info->key.label;
1047 } else {
1048 err = geneve6_build_skb(dst, skb, 0, geneve->vni,
1049 0, NULL, flags, xnet);
1050 if (unlikely(err))
1051 goto err;
1052
1053 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1054 iip, skb);
1055 ttl = geneve->ttl;
1056 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
1057 ttl = 1;
1058 ttl = ttl ? : ip6_dst_hoplimit(dst);
1059 label = geneve->label;
1060 }
1061
1062 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1063 &fl6.saddr, &fl6.daddr, prio, ttl, label,
1064 sport, geneve->dst_port,
1065 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX));
1066 return NETDEV_TX_OK;
1067
1068tx_error:
1069 dev_kfree_skb(skb);
1070err:
1071 if (err == -ELOOP)
1072 dev->stats.collisions++;
1073 else if (err == -ENETUNREACH)
1074 dev->stats.tx_carrier_errors++;
1075 else
1076 dev->stats.tx_errors++;
1077 return NETDEV_TX_OK;
1078}
1079#endif
1080
1081static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1082{
1083 struct geneve_dev *geneve = netdev_priv(dev);
1084 struct ip_tunnel_info *info = NULL;
1085
1086 if (geneve->collect_md)
1087 info = skb_tunnel_info(skb);
1088
1089#if IS_ENABLED(CONFIG_IPV6)
1090 if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
1091 (!info && geneve->remote.sa.sa_family == AF_INET6))
1092 return geneve6_xmit_skb(skb, dev, info);
1093#endif
1094 return geneve_xmit_skb(skb, dev, info);
1095}
1096
1097static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1098{
1099 /* The max_mtu calculation does not take account of GENEVE
1100 * options, to avoid excluding potentially valid
1101 * configurations.
1102 */
1103 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr)
1104 - dev->hard_header_len;
1105
1106 if (new_mtu < 68)
1107 return -EINVAL;
1108
1109 if (new_mtu > max_mtu) {
1110 if (strict)
1111 return -EINVAL;
1112
1113 new_mtu = max_mtu;
1114 }
1115
1116 dev->mtu = new_mtu;
1117 return 0;
1118}
1119
1120static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1121{
1122 return __geneve_change_mtu(dev, new_mtu, true);
1123}
1124
1125static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1126{
1127 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1128 struct geneve_dev *geneve = netdev_priv(dev);
1129 struct rtable *rt;
1130 struct flowi4 fl4;
1131#if IS_ENABLED(CONFIG_IPV6)
1132 struct dst_entry *dst;
1133 struct flowi6 fl6;
1134#endif
1135
1136 if (ip_tunnel_info_af(info) == AF_INET) {
1137 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
1138 if (IS_ERR(rt))
1139 return PTR_ERR(rt);
1140
1141 ip_rt_put(rt);
1142 info->key.u.ipv4.src = fl4.saddr;
1143#if IS_ENABLED(CONFIG_IPV6)
1144 } else if (ip_tunnel_info_af(info) == AF_INET6) {
1145 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
1146 if (IS_ERR(dst))
1147 return PTR_ERR(dst);
1148
1149 dst_release(dst);
1150 info->key.u.ipv6.src = fl6.saddr;
1151#endif
1152 } else {
1153 return -EINVAL;
1154 }
1155
1156 info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1157 1, USHRT_MAX, true);
1158 info->key.tp_dst = geneve->dst_port;
1159 return 0;
1160}
1161
1162static const struct net_device_ops geneve_netdev_ops = {
1163 .ndo_init = geneve_init,
1164 .ndo_uninit = geneve_uninit,
1165 .ndo_open = geneve_open,
1166 .ndo_stop = geneve_stop,
1167 .ndo_start_xmit = geneve_xmit,
1168 .ndo_get_stats64 = ip_tunnel_get_stats64,
1169 .ndo_change_mtu = geneve_change_mtu,
1170 .ndo_validate_addr = eth_validate_addr,
1171 .ndo_set_mac_address = eth_mac_addr,
1172 .ndo_fill_metadata_dst = geneve_fill_metadata_dst,
1173};
1174
1175static void geneve_get_drvinfo(struct net_device *dev,
1176 struct ethtool_drvinfo *drvinfo)
1177{
1178 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1179 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1180}
1181
1182static const struct ethtool_ops geneve_ethtool_ops = {
1183 .get_drvinfo = geneve_get_drvinfo,
1184 .get_link = ethtool_op_get_link,
1185};
1186
1187/* Info for udev, that this is a virtual tunnel endpoint */
1188static struct device_type geneve_type = {
1189 .name = "geneve",
1190};
1191
1192/* Calls the ndo_add_geneve_port of the caller in order to
1193 * supply the listening GENEVE udp ports. Callers are expected
1194 * to implement the ndo_add_geneve_port.
1195 */
1196void geneve_get_rx_port(struct net_device *dev)
1197{
1198 struct net *net = dev_net(dev);
1199 struct geneve_net *gn = net_generic(net, geneve_net_id);
1200 struct geneve_sock *gs;
1201 sa_family_t sa_family;
1202 struct sock *sk;
1203 __be16 port;
1204
1205 rcu_read_lock();
1206 list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1207 sk = gs->sock->sk;
1208 sa_family = sk->sk_family;
1209 port = inet_sk(sk)->inet_sport;
1210 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port);
1211 }
1212 rcu_read_unlock();
1213}
1214EXPORT_SYMBOL_GPL(geneve_get_rx_port);
1215
1216/* Initialize the device structure. */
1217static void geneve_setup(struct net_device *dev)
1218{
1219 ether_setup(dev);
1220
1221 dev->netdev_ops = &geneve_netdev_ops;
1222 dev->ethtool_ops = &geneve_ethtool_ops;
1223 dev->destructor = free_netdev;
1224
1225 SET_NETDEV_DEVTYPE(dev, &geneve_type);
1226
1227 dev->features |= NETIF_F_LLTX;
1228 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1229 dev->features |= NETIF_F_RXCSUM;
1230 dev->features |= NETIF_F_GSO_SOFTWARE;
1231
1232 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1233 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1234
1235 netif_keep_dst(dev);
1236 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1237 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1238 eth_hw_addr_random(dev);
1239}
1240
1241static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1242 [IFLA_GENEVE_ID] = { .type = NLA_U32 },
1243 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1244 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
1245 [IFLA_GENEVE_TTL] = { .type = NLA_U8 },
1246 [IFLA_GENEVE_TOS] = { .type = NLA_U8 },
1247 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 },
1248 [IFLA_GENEVE_PORT] = { .type = NLA_U16 },
1249 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
1250 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
1251 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1252 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1253};
1254
1255static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1256{
1257 if (tb[IFLA_ADDRESS]) {
1258 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1259 return -EINVAL;
1260
1261 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1262 return -EADDRNOTAVAIL;
1263 }
1264
1265 if (!data)
1266 return -EINVAL;
1267
1268 if (data[IFLA_GENEVE_ID]) {
1269 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1270
1271 if (vni >= GENEVE_VID_MASK)
1272 return -ERANGE;
1273 }
1274
1275 return 0;
1276}
1277
1278static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1279 __be16 dst_port,
1280 union geneve_addr *remote,
1281 u8 vni[],
1282 bool *tun_on_same_port,
1283 bool *tun_collect_md)
1284{
1285 struct geneve_dev *geneve, *t;
1286
1287 *tun_on_same_port = false;
1288 *tun_collect_md = false;
1289 t = NULL;
1290 list_for_each_entry(geneve, &gn->geneve_list, next) {
1291 if (geneve->dst_port == dst_port) {
1292 *tun_collect_md = geneve->collect_md;
1293 *tun_on_same_port = true;
1294 }
1295 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
1296 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
1297 dst_port == geneve->dst_port)
1298 t = geneve;
1299 }
1300 return t;
1301}
1302
1303static int geneve_configure(struct net *net, struct net_device *dev,
1304 union geneve_addr *remote,
1305 __u32 vni, __u8 ttl, __u8 tos, __be32 label,
1306 __be16 dst_port, bool metadata, u32 flags)
1307{
1308 struct geneve_net *gn = net_generic(net, geneve_net_id);
1309 struct geneve_dev *t, *geneve = netdev_priv(dev);
1310 bool tun_collect_md, tun_on_same_port;
1311 int err, encap_len;
1312
1313 if (!remote)
1314 return -EINVAL;
1315 if (metadata &&
1316 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label))
1317 return -EINVAL;
1318
1319 geneve->net = net;
1320 geneve->dev = dev;
1321
1322 geneve->vni[0] = (vni & 0x00ff0000) >> 16;
1323 geneve->vni[1] = (vni & 0x0000ff00) >> 8;
1324 geneve->vni[2] = vni & 0x000000ff;
1325
1326 if ((remote->sa.sa_family == AF_INET &&
1327 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
1328 (remote->sa.sa_family == AF_INET6 &&
1329 ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
1330 return -EINVAL;
1331 if (label && remote->sa.sa_family != AF_INET6)
1332 return -EINVAL;
1333
1334 geneve->remote = *remote;
1335
1336 geneve->ttl = ttl;
1337 geneve->tos = tos;
1338 geneve->label = label;
1339 geneve->dst_port = dst_port;
1340 geneve->collect_md = metadata;
1341 geneve->flags = flags;
1342
1343 t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
1344 &tun_on_same_port, &tun_collect_md);
1345 if (t)
1346 return -EBUSY;
1347
1348 /* make enough headroom for basic scenario */
1349 encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1350 if (remote->sa.sa_family == AF_INET)
1351 encap_len += sizeof(struct iphdr);
1352 else
1353 encap_len += sizeof(struct ipv6hdr);
1354 dev->needed_headroom = encap_len + ETH_HLEN;
1355
1356 if (metadata) {
1357 if (tun_on_same_port)
1358 return -EPERM;
1359 } else {
1360 if (tun_collect_md)
1361 return -EPERM;
1362 }
1363
1364 dst_cache_reset(&geneve->dst_cache);
1365
1366 err = register_netdevice(dev);
1367 if (err)
1368 return err;
1369
1370 list_add(&geneve->next, &gn->geneve_list);
1371 return 0;
1372}
1373
1374static int geneve_newlink(struct net *net, struct net_device *dev,
1375 struct nlattr *tb[], struct nlattr *data[])
1376{
1377 __be16 dst_port = htons(GENEVE_UDP_PORT);
1378 __u8 ttl = 0, tos = 0;
1379 bool metadata = false;
1380 union geneve_addr remote = geneve_remote_unspec;
1381 __be32 label = 0;
1382 __u32 vni = 0;
1383 u32 flags = 0;
1384
1385 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1386 return -EINVAL;
1387
1388 if (data[IFLA_GENEVE_REMOTE]) {
1389 remote.sa.sa_family = AF_INET;
1390 remote.sin.sin_addr.s_addr =
1391 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1392 }
1393
1394 if (data[IFLA_GENEVE_REMOTE6]) {
1395 if (!IS_ENABLED(CONFIG_IPV6))
1396 return -EPFNOSUPPORT;
1397
1398 remote.sa.sa_family = AF_INET6;
1399 remote.sin6.sin6_addr =
1400 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1401
1402 if (ipv6_addr_type(&remote.sin6.sin6_addr) &
1403 IPV6_ADDR_LINKLOCAL) {
1404 netdev_dbg(dev, "link-local remote is unsupported\n");
1405 return -EINVAL;
1406 }
1407 }
1408
1409 if (data[IFLA_GENEVE_ID])
1410 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1411
1412 if (data[IFLA_GENEVE_TTL])
1413 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1414
1415 if (data[IFLA_GENEVE_TOS])
1416 tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1417
1418 if (data[IFLA_GENEVE_LABEL])
1419 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1420 IPV6_FLOWLABEL_MASK;
1421
1422 if (data[IFLA_GENEVE_PORT])
1423 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
1424
1425 if (data[IFLA_GENEVE_COLLECT_METADATA])
1426 metadata = true;
1427
1428 if (data[IFLA_GENEVE_UDP_CSUM] &&
1429 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1430 flags |= GENEVE_F_UDP_ZERO_CSUM_TX;
1431
1432 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1433 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1434 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX;
1435
1436 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1437 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1438 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX;
1439
1440 return geneve_configure(net, dev, &remote, vni, ttl, tos, label,
1441 dst_port, metadata, flags);
1442}
1443
1444static void geneve_dellink(struct net_device *dev, struct list_head *head)
1445{
1446 struct geneve_dev *geneve = netdev_priv(dev);
1447
1448 list_del(&geneve->next);
1449 unregister_netdevice_queue(dev, head);
1450}
1451
1452static size_t geneve_get_size(const struct net_device *dev)
1453{
1454 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
1455 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1456 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
1457 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
1458 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */
1459 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
1460 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
1461 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1462 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1463 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1464 0;
1465}
1466
1467static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1468{
1469 struct geneve_dev *geneve = netdev_priv(dev);
1470 __u32 vni;
1471
1472 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
1473 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1474 goto nla_put_failure;
1475
1476 if (geneve->remote.sa.sa_family == AF_INET) {
1477 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1478 geneve->remote.sin.sin_addr.s_addr))
1479 goto nla_put_failure;
1480#if IS_ENABLED(CONFIG_IPV6)
1481 } else {
1482 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1483 &geneve->remote.sin6.sin6_addr))
1484 goto nla_put_failure;
1485#endif
1486 }
1487
1488 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
1489 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) ||
1490 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label))
1491 goto nla_put_failure;
1492
1493 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
1494 goto nla_put_failure;
1495
1496 if (geneve->collect_md) {
1497 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1498 goto nla_put_failure;
1499 }
1500
1501 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1502 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) ||
1503 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1504 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) ||
1505 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1506 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)))
1507 goto nla_put_failure;
1508
1509 return 0;
1510
1511nla_put_failure:
1512 return -EMSGSIZE;
1513}
1514
1515static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1516 .kind = "geneve",
1517 .maxtype = IFLA_GENEVE_MAX,
1518 .policy = geneve_policy,
1519 .priv_size = sizeof(struct geneve_dev),
1520 .setup = geneve_setup,
1521 .validate = geneve_validate,
1522 .newlink = geneve_newlink,
1523 .dellink = geneve_dellink,
1524 .get_size = geneve_get_size,
1525 .fill_info = geneve_fill_info,
1526};
1527
1528struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1529 u8 name_assign_type, u16 dst_port)
1530{
1531 struct nlattr *tb[IFLA_MAX + 1];
1532 struct net_device *dev;
1533 int err;
1534
1535 memset(tb, 0, sizeof(tb));
1536 dev = rtnl_create_link(net, name, name_assign_type,
1537 &geneve_link_ops, tb);
1538 if (IS_ERR(dev))
1539 return dev;
1540
1541 err = geneve_configure(net, dev, &geneve_remote_unspec,
1542 0, 0, 0, 0, htons(dst_port), true,
1543 GENEVE_F_UDP_ZERO_CSUM6_RX);
1544 if (err)
1545 goto err;
1546
1547 /* openvswitch users expect packet sizes to be unrestricted,
1548 * so set the largest MTU we can.
1549 */
1550 err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
1551 if (err)
1552 goto err;
1553
1554 return dev;
1555
1556 err:
1557 free_netdev(dev);
1558 return ERR_PTR(err);
1559}
1560EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1561
1562static __net_init int geneve_init_net(struct net *net)
1563{
1564 struct geneve_net *gn = net_generic(net, geneve_net_id);
1565
1566 INIT_LIST_HEAD(&gn->geneve_list);
1567 INIT_LIST_HEAD(&gn->sock_list);
1568 return 0;
1569}
1570
1571static void __net_exit geneve_exit_net(struct net *net)
1572{
1573 struct geneve_net *gn = net_generic(net, geneve_net_id);
1574 struct geneve_dev *geneve, *next;
1575 struct net_device *dev, *aux;
1576 LIST_HEAD(list);
1577
1578 rtnl_lock();
1579
1580 /* gather any geneve devices that were moved into this ns */
1581 for_each_netdev_safe(net, dev, aux)
1582 if (dev->rtnl_link_ops == &geneve_link_ops)
1583 unregister_netdevice_queue(dev, &list);
1584
1585 /* now gather any other geneve devices that were created in this ns */
1586 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1587 /* If geneve->dev is in the same netns, it was already added
1588 * to the list by the previous loop.
1589 */
1590 if (!net_eq(dev_net(geneve->dev), net))
1591 unregister_netdevice_queue(geneve->dev, &list);
1592 }
1593
1594 /* unregister the devices gathered above */
1595 unregister_netdevice_many(&list);
1596 rtnl_unlock();
1597}
1598
1599static struct pernet_operations geneve_net_ops = {
1600 .init = geneve_init_net,
1601 .exit = geneve_exit_net,
1602 .id = &geneve_net_id,
1603 .size = sizeof(struct geneve_net),
1604};
1605
1606static int __init geneve_init_module(void)
1607{
1608 int rc;
1609
1610 rc = register_pernet_subsys(&geneve_net_ops);
1611 if (rc)
1612 goto out1;
1613
1614 rc = rtnl_link_register(&geneve_link_ops);
1615 if (rc)
1616 goto out2;
1617
1618 return 0;
1619out2:
1620 unregister_pernet_subsys(&geneve_net_ops);
1621out1:
1622 return rc;
1623}
1624late_initcall(geneve_init_module);
1625
1626static void __exit geneve_cleanup_module(void)
1627{
1628 rtnl_link_unregister(&geneve_link_ops);
1629 unregister_pernet_subsys(&geneve_net_ops);
1630}
1631module_exit(geneve_cleanup_module);
1632
1633MODULE_LICENSE("GPL");
1634MODULE_VERSION(GENEVE_NETDEV_VER);
1635MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1636MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1637MODULE_ALIAS_RTNL_LINK("geneve");